* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits)
sched/tracing: Add a new tracepoint for sleeptime
sched: Disable scheduler warnings during oopses
sched: Fix cgroup movement of waking process
sched: Fix cgroup movement of newly created process
sched: Fix cgroup movement of forking process
sched: Remove cfs bandwidth period check in tg_set_cfs_period()
sched: Fix load-balance lock-breaking
sched: Replace all_pinned with a generic flags field
sched: Only queue remote wakeups when crossing cache boundaries
sched: Add missing rcu_dereference() around ->real_parent usage
[S390] fix cputime overflow in uptime_proc_show
[S390] cputime: add sparse checking and cleanup
sched: Mark parent and real_parent as __rcu
sched, nohz: Fix missing RCU read lock
sched, nohz: Set the NOHZ_BALANCE_KICK flag for idle load balancer
sched, nohz: Fix the idle cpu check in nohz_idle_balance
sched: Use jump_labels for sched_feat
sched/accounting: Fix parameter passing in task_group_account_field
sched/accounting: Fix user/system tick double accounting
sched/accounting: Re-use scheduler statistics for the root cgroup
...
Fix up conflicts in
- arch/ia64/include/asm/cputime.h, include/asm-generic/cputime.h
usecs_to_cputime64() vs the sparse cleanups
- kernel/sched/fair.c, kernel/time/tick-sched.c
scheduler changes in multiple branches
#include <linux/jiffies.h>
#include <asm/processor.h>
-typedef u64 cputime_t;
-typedef u64 cputime64_t;
+typedef u64 __nocast cputime_t;
+typedef u64 __nocast cputime64_t;
-#define cputime_zero ((cputime_t)0)
#define cputime_one_jiffy jiffies_to_cputime(1)
-#define cputime_max ((~((cputime_t)0) >> 1) - 1)
-#define cputime_add(__a, __b) ((__a) + (__b))
-#define cputime_sub(__a, __b) ((__a) - (__b))
-#define cputime_div(__a, __n) ((__a) / (__n))
-#define cputime_halve(__a) ((__a) >> 1)
-#define cputime_eq(__a, __b) ((__a) == (__b))
-#define cputime_gt(__a, __b) ((__a) > (__b))
-#define cputime_ge(__a, __b) ((__a) >= (__b))
-#define cputime_lt(__a, __b) ((__a) < (__b))
-#define cputime_le(__a, __b) ((__a) <= (__b))
-
-#define cputime64_zero ((cputime64_t)0)
-#define cputime64_add(__a, __b) ((__a) + (__b))
-#define cputime64_sub(__a, __b) ((__a) - (__b))
-#define cputime_to_cputime64(__ct) (__ct)
/*
* Convert cputime <-> jiffies (HZ)
*/
-#define cputime_to_jiffies(__ct) ((__ct) / (NSEC_PER_SEC / HZ))
-#define jiffies_to_cputime(__jif) ((__jif) * (NSEC_PER_SEC / HZ))
-#define cputime64_to_jiffies64(__ct) ((__ct) / (NSEC_PER_SEC / HZ))
-#define jiffies64_to_cputime64(__jif) ((__jif) * (NSEC_PER_SEC / HZ))
+#define cputime_to_jiffies(__ct) \
+ ((__force u64)(__ct) / (NSEC_PER_SEC / HZ))
+#define jiffies_to_cputime(__jif) \
+ (__force cputime_t)((__jif) * (NSEC_PER_SEC / HZ))
+#define cputime64_to_jiffies64(__ct) \
+ ((__force u64)(__ct) / (NSEC_PER_SEC / HZ))
+#define jiffies64_to_cputime64(__jif) \
+ (__force cputime64_t)((__jif) * (NSEC_PER_SEC / HZ))
/*
* Convert cputime <-> microseconds
*/
-#define cputime_to_usecs(__ct) ((__ct) / NSEC_PER_USEC)
-#define usecs_to_cputime(__usecs) ((__usecs) * NSEC_PER_USEC)
-#define usecs_to_cputime64(__usecs) usecs_to_cputime(__usecs)
+#define cputime_to_usecs(__ct) \
+ ((__force u64)(__ct) / NSEC_PER_USEC)
+#define usecs_to_cputime(__usecs) \
+ (__force cputime_t)((__usecs) * NSEC_PER_USEC)
+#define usecs_to_cputime64(__usecs) \
+ (__force cputime64_t)((__usecs) * NSEC_PER_USEC)
/*
* Convert cputime <-> seconds
*/
-#define cputime_to_secs(__ct) ((__ct) / NSEC_PER_SEC)
-#define secs_to_cputime(__secs) ((__secs) * NSEC_PER_SEC)
+#define cputime_to_secs(__ct) \
+ ((__force u64)(__ct) / NSEC_PER_SEC)
+#define secs_to_cputime(__secs) \
+ (__force cputime_t)((__secs) * NSEC_PER_SEC)
/*
* Convert cputime <-> timespec (nsec)
*/
static inline cputime_t timespec_to_cputime(const struct timespec *val)
{
- cputime_t ret = val->tv_sec * NSEC_PER_SEC;
- return (ret + val->tv_nsec);
+ u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
+ return (__force cputime_t) ret;
}
static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
{
- val->tv_sec = ct / NSEC_PER_SEC;
- val->tv_nsec = ct % NSEC_PER_SEC;
+ val->tv_sec = (__force u64) ct / NSEC_PER_SEC;
+ val->tv_nsec = (__force u64) ct % NSEC_PER_SEC;
}
/*
*/
static inline cputime_t timeval_to_cputime(struct timeval *val)
{
- cputime_t ret = val->tv_sec * NSEC_PER_SEC;
- return (ret + val->tv_usec * NSEC_PER_USEC);
+ u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_usec * NSEC_PER_USEC;
+ return (__force cputime_t) ret;
}
static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
{
- val->tv_sec = ct / NSEC_PER_SEC;
- val->tv_usec = (ct % NSEC_PER_SEC) / NSEC_PER_USEC;
+ val->tv_sec = (__force u64) ct / NSEC_PER_SEC;
+ val->tv_usec = ((__force u64) ct % NSEC_PER_SEC) / NSEC_PER_USEC;
}
/*
* Convert cputime <-> clock (USER_HZ)
*/
-#define cputime_to_clock_t(__ct) ((__ct) / (NSEC_PER_SEC / USER_HZ))
-#define clock_t_to_cputime(__x) ((__x) * (NSEC_PER_SEC / USER_HZ))
+#define cputime_to_clock_t(__ct) \
+ ((__force u64)(__ct) / (NSEC_PER_SEC / USER_HZ))
+#define clock_t_to_cputime(__x) \
+ (__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ))
/*
* Convert cputime64 to clock.
*/
-#define cputime64_to_clock_t(__ct) cputime_to_clock_t((cputime_t)__ct)
+#define cputime64_to_clock_t(__ct) \
+ cputime_to_clock_t((__force cputime_t)__ct)
#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
#endif /* __IA64_CPUTIME_H */
#include <asm/time.h>
#include <asm/param.h>
-typedef u64 cputime_t;
-typedef u64 cputime64_t;
-
-#define cputime_zero ((cputime_t)0)
-#define cputime_max ((~((cputime_t)0) >> 1) - 1)
-#define cputime_add(__a, __b) ((__a) + (__b))
-#define cputime_sub(__a, __b) ((__a) - (__b))
-#define cputime_div(__a, __n) ((__a) / (__n))
-#define cputime_halve(__a) ((__a) >> 1)
-#define cputime_eq(__a, __b) ((__a) == (__b))
-#define cputime_gt(__a, __b) ((__a) > (__b))
-#define cputime_ge(__a, __b) ((__a) >= (__b))
-#define cputime_lt(__a, __b) ((__a) < (__b))
-#define cputime_le(__a, __b) ((__a) <= (__b))
-
-#define cputime64_zero ((cputime64_t)0)
-#define cputime64_add(__a, __b) ((__a) + (__b))
-#define cputime64_sub(__a, __b) ((__a) - (__b))
-#define cputime_to_cputime64(__ct) (__ct)
+typedef u64 __nocast cputime_t;
+typedef u64 __nocast cputime64_t;
#ifdef __KERNEL__
static inline unsigned long cputime_to_jiffies(const cputime_t ct)
{
- return mulhdu(ct, __cputime_jiffies_factor);
+ return mulhdu((__force u64) ct, __cputime_jiffies_factor);
}
/* Estimate the scaled cputime by scaling the real cputime based on
{
if (cpu_has_feature(CPU_FTR_SPURR) &&
__get_cpu_var(cputime_last_delta))
- return ct * __get_cpu_var(cputime_scaled_last_delta) /
- __get_cpu_var(cputime_last_delta);
+ return (__force u64) ct *
+ __get_cpu_var(cputime_scaled_last_delta) /
+ __get_cpu_var(cputime_last_delta);
return ct;
}
static inline cputime_t jiffies_to_cputime(const unsigned long jif)
{
- cputime_t ct;
+ u64 ct;
unsigned long sec;
/* have to be a little careful about overflow */
}
if (sec)
ct += (cputime_t) sec * tb_ticks_per_sec;
- return ct;
+ return (__force cputime_t) ct;
}
static inline void setup_cputime_one_jiffy(void)
static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
{
- cputime_t ct;
+ u64 ct;
u64 sec;
/* have to be a little careful about overflow */
do_div(ct, HZ);
}
if (sec)
- ct += (cputime_t) sec * tb_ticks_per_sec;
- return ct;
+ ct += (u64) sec * tb_ticks_per_sec;
+ return (__force cputime64_t) ct;
}
static inline u64 cputime64_to_jiffies64(const cputime_t ct)
{
- return mulhdu(ct, __cputime_jiffies_factor);
+ return mulhdu((__force u64) ct, __cputime_jiffies_factor);
}
/*
static inline unsigned long cputime_to_usecs(const cputime_t ct)
{
- return mulhdu(ct, __cputime_msec_factor) * USEC_PER_MSEC;
+ return mulhdu((__force u64) ct, __cputime_msec_factor) * USEC_PER_MSEC;
}
static inline cputime_t usecs_to_cputime(const unsigned long us)
{
- cputime_t ct;
+ u64 ct;
unsigned long sec;
/* have to be a little careful about overflow */
}
if (sec)
ct += (cputime_t) sec * tb_ticks_per_sec;
- return ct;
+ return (__force cputime_t) ct;
}
#define usecs_to_cputime64(us) usecs_to_cputime(us)
static inline unsigned long cputime_to_secs(const cputime_t ct)
{
- return mulhdu(ct, __cputime_sec_factor);
+ return mulhdu((__force u64) ct, __cputime_sec_factor);
}
static inline cputime_t secs_to_cputime(const unsigned long sec)
{
- return (cputime_t) sec * tb_ticks_per_sec;
+ return (__force cputime_t)((u64) sec * tb_ticks_per_sec);
}
/*
*/
static inline void cputime_to_timespec(const cputime_t ct, struct timespec *p)
{
- u64 x = ct;
+ u64 x = (__force u64) ct;
unsigned int frac;
frac = do_div(x, tb_ticks_per_sec);
static inline cputime_t timespec_to_cputime(const struct timespec *p)
{
- cputime_t ct;
+ u64 ct;
ct = (u64) p->tv_nsec * tb_ticks_per_sec;
do_div(ct, 1000000000);
- return ct + (u64) p->tv_sec * tb_ticks_per_sec;
+ return (__force cputime_t)(ct + (u64) p->tv_sec * tb_ticks_per_sec);
}
/*
*/
static inline void cputime_to_timeval(const cputime_t ct, struct timeval *p)
{
- u64 x = ct;
+ u64 x = (__force u64) ct;
unsigned int frac;
frac = do_div(x, tb_ticks_per_sec);
static inline cputime_t timeval_to_cputime(const struct timeval *p)
{
- cputime_t ct;
+ u64 ct;
ct = (u64) p->tv_usec * tb_ticks_per_sec;
do_div(ct, 1000000);
- return ct + (u64) p->tv_sec * tb_ticks_per_sec;
+ return (__force cputime_t)(ct + (u64) p->tv_sec * tb_ticks_per_sec);
}
/*
static inline unsigned long cputime_to_clock_t(const cputime_t ct)
{
- return mulhdu(ct, __cputime_clockt_factor);
+ return mulhdu((__force u64) ct, __cputime_clockt_factor);
}
static inline cputime_t clock_t_to_cputime(const unsigned long clk)
{
- cputime_t ct;
+ u64 ct;
unsigned long sec;
/* have to be a little careful about overflow */
do_div(ct, USER_HZ);
}
if (sec)
- ct += (cputime_t) sec * tb_ticks_per_sec;
- return ct;
+ ct += (u64) sec * tb_ticks_per_sec;
+ return (__force cputime_t) ct;
}
#define cputime64_to_clock_t(ct) cputime_to_clock_t((cputime_t)(ct))
j = 0;
for_each_online_cpu(i) {
os_data->os_cpu[j].per_cpu_user =
- cputime_to_jiffies(kstat_cpu(i).cpustat.user);
+ cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_USER]);
os_data->os_cpu[j].per_cpu_nice =
- cputime_to_jiffies(kstat_cpu(i).cpustat.nice);
+ cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_NICE]);
os_data->os_cpu[j].per_cpu_system =
- cputime_to_jiffies(kstat_cpu(i).cpustat.system);
+ cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM]);
os_data->os_cpu[j].per_cpu_idle =
- cputime_to_jiffies(kstat_cpu(i).cpustat.idle);
+ cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IDLE]);
os_data->os_cpu[j].per_cpu_irq =
- cputime_to_jiffies(kstat_cpu(i).cpustat.irq);
+ cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IRQ]);
os_data->os_cpu[j].per_cpu_softirq =
- cputime_to_jiffies(kstat_cpu(i).cpustat.softirq);
+ cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ]);
os_data->os_cpu[j].per_cpu_iowait =
- cputime_to_jiffies(kstat_cpu(i).cpustat.iowait);
+ cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_IOWAIT]);
os_data->os_cpu[j].per_cpu_steal =
- cputime_to_jiffies(kstat_cpu(i).cpustat.steal);
+ cputime_to_jiffies(kcpustat_cpu(i).cpustat[CPUTIME_STEAL]);
os_data->os_cpu[j].cpu_id = i;
j++;
}
/* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
-typedef unsigned long long cputime_t;
-typedef unsigned long long cputime64_t;
+typedef unsigned long long __nocast cputime_t;
+typedef unsigned long long __nocast cputime64_t;
-#ifndef __s390x__
-
-static inline unsigned int
-__div(unsigned long long n, unsigned int base)
+static inline unsigned long __div(unsigned long long n, unsigned long base)
{
+#ifndef __s390x__
register_pair rp;
rp.pair = n >> 1;
asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
return rp.subreg.odd;
+#else /* __s390x__ */
+ return n / base;
+#endif /* __s390x__ */
}
-#else /* __s390x__ */
+#define cputime_one_jiffy jiffies_to_cputime(1)
-static inline unsigned int
-__div(unsigned long long n, unsigned int base)
+/*
+ * Convert cputime to jiffies and back.
+ */
+static inline unsigned long cputime_to_jiffies(const cputime_t cputime)
{
- return n / base;
+ return __div((__force unsigned long long) cputime, 4096000000ULL / HZ);
}
-#endif /* __s390x__ */
+static inline cputime_t jiffies_to_cputime(const unsigned int jif)
+{
+ return (__force cputime_t)(jif * (4096000000ULL / HZ));
+}
-#define cputime_zero (0ULL)
-#define cputime_one_jiffy jiffies_to_cputime(1)
-#define cputime_max ((~0UL >> 1) - 1)
-#define cputime_add(__a, __b) ((__a) + (__b))
-#define cputime_sub(__a, __b) ((__a) - (__b))
-#define cputime_div(__a, __n) ({ \
- unsigned long long __div = (__a); \
- do_div(__div,__n); \
- __div; \
-})
-#define cputime_halve(__a) ((__a) >> 1)
-#define cputime_eq(__a, __b) ((__a) == (__b))
-#define cputime_gt(__a, __b) ((__a) > (__b))
-#define cputime_ge(__a, __b) ((__a) >= (__b))
-#define cputime_lt(__a, __b) ((__a) < (__b))
-#define cputime_le(__a, __b) ((__a) <= (__b))
-#define cputime_to_jiffies(__ct) (__div((__ct), 4096000000ULL / HZ))
-#define cputime_to_scaled(__ct) (__ct)
-#define jiffies_to_cputime(__hz) ((cputime_t)(__hz) * (4096000000ULL / HZ))
-
-#define cputime64_zero (0ULL)
-#define cputime64_add(__a, __b) ((__a) + (__b))
-#define cputime_to_cputime64(__ct) (__ct)
-
-static inline u64
-cputime64_to_jiffies64(cputime64_t cputime)
-{
- do_div(cputime, 4096000000ULL / HZ);
- return cputime;
+static inline u64 cputime64_to_jiffies64(cputime64_t cputime)
+{
+ unsigned long long jif = (__force unsigned long long) cputime;
+ do_div(jif, 4096000000ULL / HZ);
+ return jif;
+}
+
+static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
+{
+ return (__force cputime64_t)(jif * (4096000000ULL / HZ));
}
/*
* Convert cputime to microseconds and back.
*/
-static inline unsigned int
-cputime_to_usecs(const cputime_t cputime)
+static inline unsigned int cputime_to_usecs(const cputime_t cputime)
{
- return cputime_div(cputime, 4096);
+ return (__force unsigned long long) cputime >> 12;
}
-static inline cputime_t
-usecs_to_cputime(const unsigned int m)
+static inline cputime_t usecs_to_cputime(const unsigned int m)
{
- return (cputime_t) m * 4096;
+ return (__force cputime_t)(m * 4096ULL);
}
#define usecs_to_cputime64(m) usecs_to_cputime(m)
/*
* Convert cputime to milliseconds and back.
*/
-static inline unsigned int
-cputime_to_secs(const cputime_t cputime)
+static inline unsigned int cputime_to_secs(const cputime_t cputime)
{
- return __div(cputime, 2048000000) >> 1;
+ return __div((__force unsigned long long) cputime, 2048000000) >> 1;
}
-static inline cputime_t
-secs_to_cputime(const unsigned int s)
+static inline cputime_t secs_to_cputime(const unsigned int s)
{
- return (cputime_t) s * 4096000000ULL;
+ return (__force cputime_t)(s * 4096000000ULL);
}
/*
* Convert cputime to timespec and back.
*/
-static inline cputime_t
-timespec_to_cputime(const struct timespec *value)
+static inline cputime_t timespec_to_cputime(const struct timespec *value)
{
- return value->tv_nsec * 4096 / 1000 + (u64) value->tv_sec * 4096000000ULL;
+ unsigned long long ret = value->tv_sec * 4096000000ULL;
+ return (__force cputime_t)(ret + value->tv_nsec * 4096 / 1000);
}
-static inline void
-cputime_to_timespec(const cputime_t cputime, struct timespec *value)
+static inline void cputime_to_timespec(const cputime_t cputime,
+ struct timespec *value)
{
+ unsigned long long __cputime = (__force unsigned long long) cputime;
#ifndef __s390x__
register_pair rp;
- rp.pair = cputime >> 1;
+ rp.pair = __cputime >> 1;
asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
value->tv_nsec = rp.subreg.even * 1000 / 4096;
value->tv_sec = rp.subreg.odd;
#else
- value->tv_nsec = (cputime % 4096000000ULL) * 1000 / 4096;
- value->tv_sec = cputime / 4096000000ULL;
+ value->tv_nsec = (__cputime % 4096000000ULL) * 1000 / 4096;
+ value->tv_sec = __cputime / 4096000000ULL;
#endif
}
* Since cputime and timeval have the same resolution (microseconds)
* this is easy.
*/
-static inline cputime_t
-timeval_to_cputime(const struct timeval *value)
+static inline cputime_t timeval_to_cputime(const struct timeval *value)
{
- return value->tv_usec * 4096 + (u64) value->tv_sec * 4096000000ULL;
+ unsigned long long ret = value->tv_sec * 4096000000ULL;
+ return (__force cputime_t)(ret + value->tv_usec * 4096ULL);
}
-static inline void
-cputime_to_timeval(const cputime_t cputime, struct timeval *value)
+static inline void cputime_to_timeval(const cputime_t cputime,
+ struct timeval *value)
{
+ unsigned long long __cputime = (__force unsigned long long) cputime;
#ifndef __s390x__
register_pair rp;
- rp.pair = cputime >> 1;
+ rp.pair = __cputime >> 1;
asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
value->tv_usec = rp.subreg.even / 4096;
value->tv_sec = rp.subreg.odd;
#else
- value->tv_usec = (cputime % 4096000000ULL) / 4096;
- value->tv_sec = cputime / 4096000000ULL;
+ value->tv_usec = (__cputime % 4096000000ULL) / 4096;
+ value->tv_sec = __cputime / 4096000000ULL;
#endif
}
/*
* Convert cputime to clock and back.
*/
-static inline clock_t
-cputime_to_clock_t(cputime_t cputime)
+static inline clock_t cputime_to_clock_t(cputime_t cputime)
{
- return cputime_div(cputime, 4096000000ULL / USER_HZ);
+ unsigned long long clock = (__force unsigned long long) cputime;
+ do_div(clock, 4096000000ULL / USER_HZ);
+ return clock;
}
-static inline cputime_t
-clock_t_to_cputime(unsigned long x)
+static inline cputime_t clock_t_to_cputime(unsigned long x)
{
- return (cputime_t) x * (4096000000ULL / USER_HZ);
+ return (__force cputime_t)(x * (4096000000ULL / USER_HZ));
}
/*
* Convert cputime64 to clock.
*/
-static inline clock_t
-cputime64_to_clock_t(cputime64_t cputime)
+static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
{
- return cputime_div(cputime, 4096000000ULL / USER_HZ);
+ unsigned long long clock = (__force unsigned long long) cputime;
+ do_div(clock, 4096000000ULL / USER_HZ);
+ return clock;
}
struct s390_idle_data {
#ifdef CONFIG_SMP
#define safe_address (__per_cpu_offset[0])
#else
-#define safe_address (kstat_cpu(0).cpustat.user)
+#define safe_address (__get_cpu_var(kernel_cpustat).cpustat[CPUTIME_USER])
#endif
/*
.freq_step = 5,
};
-static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
- cputime64_t *wall)
+static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
{
- cputime64_t idle_time;
- cputime64_t cur_wall_time;
- cputime64_t busy_time;
+ u64 idle_time;
+ u64 cur_wall_time;
+ u64 busy_time;
cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
- busy_time = cputime64_add(kstat_cpu(cpu).cpustat.user,
- kstat_cpu(cpu).cpustat.system);
- busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.irq);
- busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.softirq);
- busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.steal);
- busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.nice);
+ busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
- idle_time = cputime64_sub(cur_wall_time, busy_time);
+ idle_time = cur_wall_time - busy_time;
if (wall)
- *wall = (cputime64_t)jiffies_to_usecs(cur_wall_time);
+ *wall = jiffies_to_usecs(cur_wall_time);
- return (cputime64_t)jiffies_to_usecs(idle_time);
+ return jiffies_to_usecs(idle_time);
}
static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
&dbs_info->prev_cpu_wall);
if (dbs_tuners_ins.ignore_nice)
- dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice;
+ dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
}
return count;
}
cur_idle_time = get_cpu_idle_time(j, &cur_wall_time);
- wall_time = (unsigned int) cputime64_sub(cur_wall_time,
- j_dbs_info->prev_cpu_wall);
+ wall_time = (unsigned int)
+ (cur_wall_time - j_dbs_info->prev_cpu_wall);
j_dbs_info->prev_cpu_wall = cur_wall_time;
- idle_time = (unsigned int) cputime64_sub(cur_idle_time,
- j_dbs_info->prev_cpu_idle);
+ idle_time = (unsigned int)
+ (cur_idle_time - j_dbs_info->prev_cpu_idle);
j_dbs_info->prev_cpu_idle = cur_idle_time;
if (dbs_tuners_ins.ignore_nice) {
- cputime64_t cur_nice;
+ u64 cur_nice;
unsigned long cur_nice_jiffies;
- cur_nice = cputime64_sub(kstat_cpu(j).cpustat.nice,
- j_dbs_info->prev_cpu_nice);
+ cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE] -
+ j_dbs_info->prev_cpu_nice;
/*
* Assumption: nice time between sampling periods will
* be less than 2^32 jiffies for 32 bit sys
cur_nice_jiffies = (unsigned long)
cputime64_to_jiffies64(cur_nice);
- j_dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice;
+ j_dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
idle_time += jiffies_to_usecs(cur_nice_jiffies);
}
j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
&j_dbs_info->prev_cpu_wall);
- if (dbs_tuners_ins.ignore_nice) {
+ if (dbs_tuners_ins.ignore_nice)
j_dbs_info->prev_cpu_nice =
- kstat_cpu(j).cpustat.nice;
- }
+ kcpustat_cpu(j).cpustat[CPUTIME_NICE];
}
this_dbs_info->down_skip = 0;
this_dbs_info->requested_freq = policy->cur;
.powersave_bias = 0,
};
-static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
- cputime64_t *wall)
+static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
{
- cputime64_t idle_time;
- cputime64_t cur_wall_time;
- cputime64_t busy_time;
+ u64 idle_time;
+ u64 cur_wall_time;
+ u64 busy_time;
cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
- busy_time = cputime64_add(kstat_cpu(cpu).cpustat.user,
- kstat_cpu(cpu).cpustat.system);
- busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.irq);
- busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.softirq);
- busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.steal);
- busy_time = cputime64_add(busy_time, kstat_cpu(cpu).cpustat.nice);
+ busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL];
+ busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
- idle_time = cputime64_sub(cur_wall_time, busy_time);
+ idle_time = cur_wall_time - busy_time;
if (wall)
- *wall = (cputime64_t)jiffies_to_usecs(cur_wall_time);
+ *wall = jiffies_to_usecs(cur_wall_time);
- return (cputime64_t)jiffies_to_usecs(idle_time);
+ return jiffies_to_usecs(idle_time);
}
static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
&dbs_info->prev_cpu_wall);
if (dbs_tuners_ins.ignore_nice)
- dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice;
+ dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
}
return count;
cur_idle_time = get_cpu_idle_time(j, &cur_wall_time);
cur_iowait_time = get_cpu_iowait_time(j, &cur_wall_time);
- wall_time = (unsigned int) cputime64_sub(cur_wall_time,
- j_dbs_info->prev_cpu_wall);
+ wall_time = (unsigned int)
+ (cur_wall_time - j_dbs_info->prev_cpu_wall);
j_dbs_info->prev_cpu_wall = cur_wall_time;
- idle_time = (unsigned int) cputime64_sub(cur_idle_time,
- j_dbs_info->prev_cpu_idle);
+ idle_time = (unsigned int)
+ (cur_idle_time - j_dbs_info->prev_cpu_idle);
j_dbs_info->prev_cpu_idle = cur_idle_time;
- iowait_time = (unsigned int) cputime64_sub(cur_iowait_time,
- j_dbs_info->prev_cpu_iowait);
+ iowait_time = (unsigned int)
+ (cur_iowait_time - j_dbs_info->prev_cpu_iowait);
j_dbs_info->prev_cpu_iowait = cur_iowait_time;
if (dbs_tuners_ins.ignore_nice) {
- cputime64_t cur_nice;
+ u64 cur_nice;
unsigned long cur_nice_jiffies;
- cur_nice = cputime64_sub(kstat_cpu(j).cpustat.nice,
- j_dbs_info->prev_cpu_nice);
+ cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE] -
+ j_dbs_info->prev_cpu_nice;
/*
* Assumption: nice time between sampling periods will
* be less than 2^32 jiffies for 32 bit sys
cur_nice_jiffies = (unsigned long)
cputime64_to_jiffies64(cur_nice);
- j_dbs_info->prev_cpu_nice = kstat_cpu(j).cpustat.nice;
+ j_dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE];
idle_time += jiffies_to_usecs(cur_nice_jiffies);
}
j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
&j_dbs_info->prev_cpu_wall);
- if (dbs_tuners_ins.ignore_nice) {
+ if (dbs_tuners_ins.ignore_nice)
j_dbs_info->prev_cpu_nice =
- kstat_cpu(j).cpustat.nice;
- }
+ kcpustat_cpu(j).cpustat[CPUTIME_NICE];
}
this_dbs_info->cpu = cpu;
this_dbs_info->rate_mult = 1;
spin_lock(&cpufreq_stats_lock);
stat = per_cpu(cpufreq_stats_table, cpu);
if (stat->time_in_state)
- stat->time_in_state[stat->last_index] =
- cputime64_add(stat->time_in_state[stat->last_index],
- cputime_sub(cur_time, stat->last_time));
+ stat->time_in_state[stat->last_index] +=
+ cur_time - stat->last_time;
stat->last_time = cur_time;
spin_unlock(&cpufreq_stats_lock);
return 0;
*/
static inline cputime64_t get_cpu_idle_time(unsigned int cpu)
{
- cputime64_t retval;
+ u64 retval;
- retval = cputime64_add(kstat_cpu(cpu).cpustat.idle,
- kstat_cpu(cpu).cpustat.iowait);
+ retval = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE] +
+ kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
if (rackmeter_ignore_nice)
- retval = cputime64_add(retval, kstat_cpu(cpu).cpustat.nice);
+ retval += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
return retval;
}
int i, offset, load, cumm, pause;
cur_jiffies = jiffies64_to_cputime64(get_jiffies_64());
- total_ticks = (unsigned int)cputime64_sub(cur_jiffies,
- rcpu->prev_wall);
+ total_ticks = (unsigned int) (cur_jiffies - rcpu->prev_wall);
rcpu->prev_wall = cur_jiffies;
total_idle_ticks = get_cpu_idle_time(cpu);
- idle_ticks = (unsigned int) cputime64_sub(total_idle_ticks,
- rcpu->prev_idle);
+ idle_ticks = (unsigned int) (total_idle_ticks - rcpu->prev_idle);
rcpu->prev_idle = total_idle_ticks;
/* We do a very dumb calculation to update the LEDs for now,
sigemptyset(&sigign);
sigemptyset(&sigcatch);
- cutime = cstime = utime = stime = cputime_zero;
- cgtime = gtime = cputime_zero;
+ cutime = cstime = utime = stime = 0;
+ cgtime = gtime = 0;
if (lock_task_sighand(task, &flags)) {
struct signal_struct *sig = task->signal;
do {
min_flt += t->min_flt;
maj_flt += t->maj_flt;
- gtime = cputime_add(gtime, t->gtime);
+ gtime += t->gtime;
t = next_thread(t);
} while (t != task);
min_flt += sig->min_flt;
maj_flt += sig->maj_flt;
thread_group_times(task, &utime, &stime);
- gtime = cputime_add(gtime, sig->gtime);
+ gtime += sig->gtime;
}
sid = task_session_nr_ns(task, ns);
#define arch_idle_time(cpu) 0
#endif
-static cputime64_t get_idle_time(int cpu)
+static u64 get_idle_time(int cpu)
{
- u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
- cputime64_t idle;
+ u64 idle, idle_time = get_cpu_idle_time_us(cpu, NULL);
if (idle_time == -1ULL) {
/* !NO_HZ so we can rely on cpustat.idle */
- idle = kstat_cpu(cpu).cpustat.idle;
- idle = cputime64_add(idle, arch_idle_time(cpu));
+ idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
+ idle += arch_idle_time(cpu);
} else
idle = usecs_to_cputime64(idle_time);
return idle;
}
-static cputime64_t get_iowait_time(int cpu)
+static u64 get_iowait_time(int cpu)
{
- u64 iowait_time = get_cpu_iowait_time_us(cpu, NULL);
- cputime64_t iowait;
+ u64 iowait, iowait_time = get_cpu_iowait_time_us(cpu, NULL);
if (iowait_time == -1ULL)
/* !NO_HZ so we can rely on cpustat.iowait */
- iowait = kstat_cpu(cpu).cpustat.iowait;
+ iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
else
iowait = usecs_to_cputime64(iowait_time);
{
int i, j;
unsigned long jif;
- cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
- cputime64_t guest, guest_nice;
+ u64 user, nice, system, idle, iowait, irq, softirq, steal;
+ u64 guest, guest_nice;
u64 sum = 0;
u64 sum_softirq = 0;
unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
struct timespec boottime;
user = nice = system = idle = iowait =
- irq = softirq = steal = cputime64_zero;
- guest = guest_nice = cputime64_zero;
+ irq = softirq = steal = 0;
+ guest = guest_nice = 0;
getboottime(&boottime);
jif = boottime.tv_sec;
for_each_possible_cpu(i) {
- user = cputime64_add(user, kstat_cpu(i).cpustat.user);
- nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
- system = cputime64_add(system, kstat_cpu(i).cpustat.system);
- idle = cputime64_add(idle, get_idle_time(i));
- iowait = cputime64_add(iowait, get_iowait_time(i));
- irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
- softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
- steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
- guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
- guest_nice = cputime64_add(guest_nice,
- kstat_cpu(i).cpustat.guest_nice);
- sum += kstat_cpu_irqs_sum(i);
- sum += arch_irq_stat_cpu(i);
+ user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
+ nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
+ system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
+ idle += get_idle_time(i);
+ iowait += get_iowait_time(i);
+ irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
+ softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
+ steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
+ guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
+ guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
for (j = 0; j < NR_SOFTIRQS; j++) {
unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
(unsigned long long)cputime64_to_clock_t(guest_nice));
for_each_online_cpu(i) {
/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
- user = kstat_cpu(i).cpustat.user;
- nice = kstat_cpu(i).cpustat.nice;
- system = kstat_cpu(i).cpustat.system;
+ user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
+ nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
+ system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
idle = get_idle_time(i);
iowait = get_iowait_time(i);
- irq = kstat_cpu(i).cpustat.irq;
- softirq = kstat_cpu(i).cpustat.softirq;
- steal = kstat_cpu(i).cpustat.steal;
- guest = kstat_cpu(i).cpustat.guest;
- guest_nice = kstat_cpu(i).cpustat.guest_nice;
+ irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
+ softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
+ steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
+ guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
+ guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
seq_printf(p,
"cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu "
"%llu\n",
{
struct timespec uptime;
struct timespec idle;
+ u64 idletime;
+ u64 nsec;
+ u32 rem;
int i;
- cputime_t idletime = cputime_zero;
+ idletime = 0;
for_each_possible_cpu(i)
- idletime = cputime64_add(idletime, kstat_cpu(i).cpustat.idle);
+ idletime += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE];
do_posix_clock_monotonic_gettime(&uptime);
monotonic_to_bootbased(&uptime);
- cputime_to_timespec(idletime, &idle);
+ nsec = cputime64_to_jiffies64(idletime) * TICK_NSEC;
+ idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
+ idle.tv_nsec = rem;
seq_printf(m, "%lu.%02lu %lu.%02lu\n",
(unsigned long) uptime.tv_sec,
(uptime.tv_nsec / (NSEC_PER_SEC / 100)),
#include <linux/time.h>
#include <linux/jiffies.h>
-typedef unsigned long cputime_t;
+typedef unsigned long __nocast cputime_t;
-#define cputime_zero (0UL)
#define cputime_one_jiffy jiffies_to_cputime(1)
-#define cputime_max ((~0UL >> 1) - 1)
-#define cputime_add(__a, __b) ((__a) + (__b))
-#define cputime_sub(__a, __b) ((__a) - (__b))
-#define cputime_div(__a, __n) ((__a) / (__n))
-#define cputime_halve(__a) ((__a) >> 1)
-#define cputime_eq(__a, __b) ((__a) == (__b))
-#define cputime_gt(__a, __b) ((__a) > (__b))
-#define cputime_ge(__a, __b) ((__a) >= (__b))
-#define cputime_lt(__a, __b) ((__a) < (__b))
-#define cputime_le(__a, __b) ((__a) <= (__b))
-#define cputime_to_jiffies(__ct) (__ct)
+#define cputime_to_jiffies(__ct) (__force unsigned long)(__ct)
#define cputime_to_scaled(__ct) (__ct)
-#define jiffies_to_cputime(__hz) (__hz)
+#define jiffies_to_cputime(__hz) (__force cputime_t)(__hz)
-typedef u64 cputime64_t;
+typedef u64 __nocast cputime64_t;
-#define cputime64_zero (0ULL)
-#define cputime64_add(__a, __b) ((__a) + (__b))
-#define cputime64_sub(__a, __b) ((__a) - (__b))
-#define cputime64_to_jiffies64(__ct) (__ct)
-#define jiffies64_to_cputime64(__jif) (__jif)
-#define cputime_to_cputime64(__ct) ((u64) __ct)
-#define cputime64_gt(__a, __b) ((__a) > (__b))
+#define cputime64_to_jiffies64(__ct) (__force u64)(__ct)
+#define jiffies64_to_cputime64(__jif) (__force cputime64_t)(__jif)
-#define nsecs_to_cputime64(__ct) nsecs_to_jiffies64(__ct)
+#define nsecs_to_cputime64(__ct) \
+ jiffies64_to_cputime64(nsecs_to_jiffies64(__ct))
/*
* Convert cputime to microseconds and back.
*/
-#define cputime_to_usecs(__ct) jiffies_to_usecs(__ct)
-#define usecs_to_cputime(__msecs) usecs_to_jiffies(__msecs)
-#define usecs_to_cputime64(__msecs) nsecs_to_jiffies64((__msecs) * 1000)
+#define cputime_to_usecs(__ct) \
+ jiffies_to_usecs(cputime_to_jiffies(__ct))
+#define usecs_to_cputime(__usec) \
+ jiffies_to_cputime(usecs_to_jiffies(__usec))
+#define usecs_to_cputime64(__usec) \
+ jiffies64_to_cputime64(nsecs_to_jiffies64((__usec) * 1000))
/*
* Convert cputime to seconds and back.
*/
-#define cputime_to_secs(jif) ((jif) / HZ)
-#define secs_to_cputime(sec) ((sec) * HZ)
+#define cputime_to_secs(jif) (cputime_to_jiffies(jif) / HZ)
+#define secs_to_cputime(sec) jiffies_to_cputime((sec) * HZ)
/*
* Convert cputime to timespec and back.
*/
-#define timespec_to_cputime(__val) timespec_to_jiffies(__val)
-#define cputime_to_timespec(__ct,__val) jiffies_to_timespec(__ct,__val)
+#define timespec_to_cputime(__val) \
+ jiffies_to_cputime(timespec_to_jiffies(__val))
+#define cputime_to_timespec(__ct,__val) \
+ jiffies_to_timespec(cputime_to_jiffies(__ct),__val)
/*
* Convert cputime to timeval and back.
*/
-#define timeval_to_cputime(__val) timeval_to_jiffies(__val)
-#define cputime_to_timeval(__ct,__val) jiffies_to_timeval(__ct,__val)
+#define timeval_to_cputime(__val) \
+ jiffies_to_cputime(timeval_to_jiffies(__val))
+#define cputime_to_timeval(__ct,__val) \
+ jiffies_to_timeval(cputime_to_jiffies(__ct),__val)
/*
* Convert cputime to clock and back.
*/
-#define cputime_to_clock_t(__ct) jiffies_to_clock_t(__ct)
-#define clock_t_to_cputime(__x) clock_t_to_jiffies(__x)
+#define cputime_to_clock_t(__ct) \
+ jiffies_to_clock_t(cputime_to_jiffies(__ct))
+#define clock_t_to_cputime(__x) \
+ jiffies_to_cputime(clock_t_to_jiffies(__x))
/*
* Convert cputime64 to clock.
*/
-#define cputime64_to_clock_t(__ct) jiffies_64_to_clock_t(__ct)
+#define cputime64_to_clock_t(__ct) \
+ jiffies_64_to_clock_t(cputime64_to_jiffies64(__ct))
#endif
#include <linux/percpu.h>
#include <linux/cpumask.h>
#include <linux/interrupt.h>
+#include <linux/sched.h>
#include <asm/irq.h>
#include <asm/cputime.h>
* used by rstatd/perfmeter
*/
-struct cpu_usage_stat {
- cputime64_t user;
- cputime64_t nice;
- cputime64_t system;
- cputime64_t softirq;
- cputime64_t irq;
- cputime64_t idle;
- cputime64_t iowait;
- cputime64_t steal;
- cputime64_t guest;
- cputime64_t guest_nice;
+enum cpu_usage_stat {
+ CPUTIME_USER,
+ CPUTIME_NICE,
+ CPUTIME_SYSTEM,
+ CPUTIME_SOFTIRQ,
+ CPUTIME_IRQ,
+ CPUTIME_IDLE,
+ CPUTIME_IOWAIT,
+ CPUTIME_STEAL,
+ CPUTIME_GUEST,
+ CPUTIME_GUEST_NICE,
+ NR_STATS,
+};
+
+struct kernel_cpustat {
+ u64 cpustat[NR_STATS];
};
struct kernel_stat {
- struct cpu_usage_stat cpustat;
#ifndef CONFIG_GENERIC_HARDIRQS
unsigned int irqs[NR_IRQS];
#endif
};
DECLARE_PER_CPU(struct kernel_stat, kstat);
+DECLARE_PER_CPU(struct kernel_cpustat, kernel_cpustat);
-#define kstat_cpu(cpu) per_cpu(kstat, cpu)
/* Must have preemption disabled for this to be meaningful. */
-#define kstat_this_cpu __get_cpu_var(kstat)
+#define kstat_this_cpu (&__get_cpu_var(kstat))
+#define kcpustat_this_cpu (&__get_cpu_var(kernel_cpustat))
+#define kstat_cpu(cpu) per_cpu(kstat, cpu)
+#define kcpustat_cpu(cpu) per_cpu(kernel_cpustat, cpu)
extern unsigned long long nr_context_switches(void);
#define _INCLUDE_GUARD_LATENCYTOP_H_
#include <linux/compiler.h>
+struct task_struct;
+
#ifdef CONFIG_LATENCYTOP
#define LT_SAVECOUNT 32
};
-struct task_struct;
extern int latencytop_enabled;
void __account_scheduler_latency(struct task_struct *task, int usecs, int inter);
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
extern void select_nohz_load_balancer(int stop_tick);
+extern void set_cpu_sd_state_idle(void);
extern int get_nohz_timer_target(void);
#else
static inline void select_nohz_load_balancer(int stop_tick) { }
+static inline void set_cpu_sd_state_idle(void) { }
#endif
/*
#define INIT_CPUTIME \
(struct task_cputime) { \
- .utime = cputime_zero, \
- .stime = cputime_zero, \
+ .utime = 0, \
+ .stime = 0, \
.sum_exec_runtime = 0, \
}
* single CPU.
*/
unsigned int power, power_orig;
+ /*
+ * Number of busy cpus in this group.
+ */
+ atomic_t nr_busy_cpus;
};
struct sched_group {
return to_cpumask(sg->cpumask);
}
+/**
+ * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
+ * @group: The group whose first cpu is to be returned.
+ */
+static inline unsigned int group_first_cpu(struct sched_group *group)
+{
+ return cpumask_first(sched_group_cpus(group));
+}
+
struct sched_domain_attr {
int relax_domain_level;
};
* older sibling, respectively. (p->father can be replaced with
* p->real_parent->pid)
*/
- struct task_struct *real_parent; /* real parent process */
- struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
+ struct task_struct __rcu *real_parent; /* real parent process */
+ struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
/*
* children/sibling forms the list of my natural children
*/
TP_ARGS(tsk, delay));
/*
+ * Tracepoint for accounting blocked time (time the task is in uninterruptible).
+ */
+DEFINE_EVENT(sched_stat_template, sched_stat_blocked,
+ TP_PROTO(struct task_struct *tsk, u64 delay),
+ TP_ARGS(tsk, delay));
+
+/*
* Tracepoint for accounting runtime (time the task is executing
* on a CPU).
*/
(unsigned long long)__entry->vruntime)
);
+#ifdef CREATE_TRACE_POINTS
+static inline u64 trace_get_sleeptime(struct task_struct *tsk)
+{
+#ifdef CONFIG_SCHEDSTATS
+ u64 block, sleep;
+
+ block = tsk->se.statistics.block_start;
+ sleep = tsk->se.statistics.sleep_start;
+ tsk->se.statistics.block_start = 0;
+ tsk->se.statistics.sleep_start = 0;
+
+ return block ? block : sleep ? sleep : 0;
+#else
+ return 0;
+#endif
+}
+#endif
+
+/*
+ * Tracepoint for accounting sleeptime (time the task is sleeping
+ * or waiting for I/O).
+ */
+TRACE_EVENT(sched_stat_sleeptime,
+
+ TP_PROTO(struct task_struct *tsk, u64 now),
+
+ TP_ARGS(tsk, now),
+
+ TP_STRUCT__entry(
+ __array( char, comm, TASK_COMM_LEN )
+ __field( pid_t, pid )
+ __field( u64, sleeptime )
+ ),
+
+ TP_fast_assign(
+ memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);
+ __entry->pid = tsk->pid;
+ __entry->sleeptime = trace_get_sleeptime(tsk);
+ __entry->sleeptime = __entry->sleeptime ?
+ now - __entry->sleeptime : 0;
+ )
+ TP_perf_assign(
+ __perf_count(__entry->sleeptime);
+ ),
+
+ TP_printk("comm=%s pid=%d sleeptime=%Lu [ns]",
+ __entry->comm, __entry->pid,
+ (unsigned long long)__entry->sleeptime)
+);
+
/*
* Tracepoint for showing priority inheritance modifying a tasks
* priority.
# Makefile for the linux kernel.
#
-obj-y = sched.o fork.o exec_domain.o panic.o printk.o \
+obj-y = fork.o exec_domain.o panic.o printk.o \
cpu.o exit.o itimer.o time.o softirq.o resource.o \
sysctl.o sysctl_binary.o capability.o ptrace.o timer.o user.o \
signal.o sys.o kmod.o workqueue.o pid.o \
rcupdate.o extable.o params.o posix-timers.o \
kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
- notifier.o ksysfs.o sched_clock.o cred.o \
- async.o range.o
-obj-y += groups.o
+ notifier.o ksysfs.o cred.o \
+ async.o range.o groups.o
ifdef CONFIG_FUNCTION_TRACER
# Do not trace debug files and internal ftrace files
CFLAGS_REMOVE_mutex-debug.o = -pg
CFLAGS_REMOVE_rtmutex-debug.o = -pg
CFLAGS_REMOVE_cgroup-debug.o = -pg
-CFLAGS_REMOVE_sched_clock.o = -pg
CFLAGS_REMOVE_irq_work.o = -pg
endif
+obj-y += sched/
+
obj-$(CONFIG_FREEZER) += freezer.o
obj-$(CONFIG_PROFILING) += profile.o
obj-$(CONFIG_SYSCTL_SYSCALL_CHECK) += sysctl_check.o
obj-$(CONFIG_X86_DS) += trace/
obj-$(CONFIG_RING_BUFFER) += trace/
obj-$(CONFIG_TRACEPOINTS) += trace/
-obj-$(CONFIG_SMP) += sched_cpupri.o
obj-$(CONFIG_IRQ_WORK) += irq_work.o
obj-$(CONFIG_CPU_PM) += cpu_pm.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_JUMP_LABEL) += jump_label.o
-ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
-# According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
-# needed for x86 only. Why this used to be enabled for all architectures is beyond
-# me. I suspect most platforms don't need this, but until we know that for sure
-# I turn this off for IA-64 only. Andreas Schwab says it's also needed on m68k
-# to get a correct value for the wait-channel (WCHAN in ps). --davidm
-CFLAGS_sched.o := $(PROFILING) -fno-omit-frame-pointer
-endif
-
$(obj)/configs.o: $(obj)/config_data.h
# config_data.h contains the same information as ikconfig.h but gzipped.
pacct->ac_flag |= ACORE;
if (current->flags & PF_SIGNALED)
pacct->ac_flag |= AXSIG;
- pacct->ac_utime = cputime_add(pacct->ac_utime, current->utime);
- pacct->ac_stime = cputime_add(pacct->ac_stime, current->stime);
+ pacct->ac_utime += current->utime;
+ pacct->ac_stime += current->stime;
pacct->ac_minflt += current->min_flt;
pacct->ac_majflt += current->maj_flt;
spin_unlock_irq(¤t->sighand->siglock);
write_lock_irq(&tasklist_lock);
for_each_process(p) {
if (task_cpu(p) == cpu && p->state == TASK_RUNNING &&
- (!cputime_eq(p->utime, cputime_zero) ||
- !cputime_eq(p->stime, cputime_zero)))
+ (p->utime || p->stime))
printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d "
"(state = %ld, flags = %x)\n",
p->comm, task_pid_nr(p), cpu,
* We won't ever get here for the group leader, since it
* will have been the last reference on the signal_struct.
*/
- sig->utime = cputime_add(sig->utime, tsk->utime);
- sig->stime = cputime_add(sig->stime, tsk->stime);
- sig->gtime = cputime_add(sig->gtime, tsk->gtime);
+ sig->utime += tsk->utime;
+ sig->stime += tsk->stime;
+ sig->gtime += tsk->gtime;
sig->min_flt += tsk->min_flt;
sig->maj_flt += tsk->maj_flt;
sig->nvcsw += tsk->nvcsw;
spin_lock_irq(&p->real_parent->sighand->siglock);
psig = p->real_parent->signal;
sig = p->signal;
- psig->cutime =
- cputime_add(psig->cutime,
- cputime_add(tgutime,
- sig->cutime));
- psig->cstime =
- cputime_add(psig->cstime,
- cputime_add(tgstime,
- sig->cstime));
- psig->cgtime =
- cputime_add(psig->cgtime,
- cputime_add(p->gtime,
- cputime_add(sig->gtime,
- sig->cgtime)));
+ psig->cutime += tgutime + sig->cutime;
+ psig->cstime += tgstime + sig->cstime;
+ psig->cgtime += p->gtime + sig->gtime + sig->cgtime;
psig->cmin_flt +=
p->min_flt + sig->min_flt + sig->cmin_flt;
psig->cmaj_flt +=
*/
static void posix_cpu_timers_init(struct task_struct *tsk)
{
- tsk->cputime_expires.prof_exp = cputime_zero;
- tsk->cputime_expires.virt_exp = cputime_zero;
+ tsk->cputime_expires.prof_exp = 0;
+ tsk->cputime_expires.virt_exp = 0;
tsk->cputime_expires.sched_exp = 0;
INIT_LIST_HEAD(&tsk->cpu_timers[0]);
INIT_LIST_HEAD(&tsk->cpu_timers[1]);
init_sigpending(&p->pending);
- p->utime = cputime_zero;
- p->stime = cputime_zero;
- p->gtime = cputime_zero;
- p->utimescaled = cputime_zero;
- p->stimescaled = cputime_zero;
+ p->utime = p->stime = p->gtime = 0;
+ p->utimescaled = p->stimescaled = 0;
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
- p->prev_utime = cputime_zero;
- p->prev_stime = cputime_zero;
+ p->prev_utime = p->prev_stime = 0;
#endif
#if defined(SPLIT_RSS_COUNTING)
memset(&p->rss_stat, 0, sizeof(p->rss_stat));
cval = it->expires;
cinterval = it->incr;
- if (!cputime_eq(cval, cputime_zero)) {
+ if (cval) {
struct task_cputime cputime;
cputime_t t;
thread_group_cputimer(tsk, &cputime);
if (clock_id == CPUCLOCK_PROF)
- t = cputime_add(cputime.utime, cputime.stime);
+ t = cputime.utime + cputime.stime;
else
/* CPUCLOCK_VIRT */
t = cputime.utime;
- if (cputime_le(cval, t))
+ if (cval < t)
/* about to fire */
cval = cputime_one_jiffy;
else
- cval = cputime_sub(cval, t);
+ cval = cval - t;
}
spin_unlock_irq(&tsk->sighand->siglock);
cval = it->expires;
cinterval = it->incr;
- if (!cputime_eq(cval, cputime_zero) ||
- !cputime_eq(nval, cputime_zero)) {
- if (cputime_gt(nval, cputime_zero))
- nval = cputime_add(nval, cputime_one_jiffy);
+ if (cval || nval) {
+ if (nval > 0)
+ nval += cputime_one_jiffy;
set_process_cpu_timer(tsk, clock_id, &nval, &cval);
}
it->expires = nval;
if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) {
return now.sched < then.sched;
} else {
- return cputime_lt(now.cpu, then.cpu);
+ return now.cpu < then.cpu;
}
}
static inline void cpu_time_add(const clockid_t which_clock,
if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) {
acc->sched += val.sched;
} else {
- acc->cpu = cputime_add(acc->cpu, val.cpu);
+ acc->cpu += val.cpu;
}
}
static inline union cpu_time_count cpu_time_sub(const clockid_t which_clock,
if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) {
a.sched -= b.sched;
} else {
- a.cpu = cputime_sub(a.cpu, b.cpu);
+ a.cpu -= b.cpu;
}
return a;
}
/*
- * Divide and limit the result to res >= 1
- *
- * This is necessary to prevent signal delivery starvation, when the result of
- * the division would be rounded down to 0.
- */
-static inline cputime_t cputime_div_non_zero(cputime_t time, unsigned long div)
-{
- cputime_t res = cputime_div(time, div);
-
- return max_t(cputime_t, res, 1);
-}
-
-/*
* Update expiry time from increment, and increase overrun count,
* given the current clock sample.
*/
} else {
cputime_t delta, incr;
- if (cputime_lt(now.cpu, timer->it.cpu.expires.cpu))
+ if (now.cpu < timer->it.cpu.expires.cpu)
return;
incr = timer->it.cpu.incr.cpu;
- delta = cputime_sub(cputime_add(now.cpu, incr),
- timer->it.cpu.expires.cpu);
+ delta = now.cpu + incr - timer->it.cpu.expires.cpu;
/* Don't use (incr*2 < delta), incr*2 might overflow. */
- for (i = 0; cputime_lt(incr, cputime_sub(delta, incr)); i++)
- incr = cputime_add(incr, incr);
- for (; i >= 0; incr = cputime_halve(incr), i--) {
- if (cputime_lt(delta, incr))
+ for (i = 0; incr < delta - incr; i++)
+ incr += incr;
+ for (; i >= 0; incr = incr >> 1, i--) {
+ if (delta < incr)
continue;
- timer->it.cpu.expires.cpu =
- cputime_add(timer->it.cpu.expires.cpu, incr);
+ timer->it.cpu.expires.cpu += incr;
timer->it_overrun += 1 << i;
- delta = cputime_sub(delta, incr);
+ delta -= incr;
}
}
}
static inline cputime_t prof_ticks(struct task_struct *p)
{
- return cputime_add(p->utime, p->stime);
+ return p->utime + p->stime;
}
static inline cputime_t virt_ticks(struct task_struct *p)
{
t = tsk;
do {
- times->utime = cputime_add(times->utime, t->utime);
- times->stime = cputime_add(times->stime, t->stime);
+ times->utime += t->utime;
+ times->stime += t->stime;
times->sum_exec_runtime += task_sched_runtime(t);
} while_each_thread(tsk, t);
out:
static void update_gt_cputime(struct task_cputime *a, struct task_cputime *b)
{
- if (cputime_gt(b->utime, a->utime))
+ if (b->utime > a->utime)
a->utime = b->utime;
- if (cputime_gt(b->stime, a->stime))
+ if (b->stime > a->stime)
a->stime = b->stime;
if (b->sum_exec_runtime > a->sum_exec_runtime)
return -EINVAL;
case CPUCLOCK_PROF:
thread_group_cputime(p, &cputime);
- cpu->cpu = cputime_add(cputime.utime, cputime.stime);
+ cpu->cpu = cputime.utime + cputime.stime;
break;
case CPUCLOCK_VIRT:
thread_group_cputime(p, &cputime);
unsigned long long sum_exec_runtime)
{
struct cpu_timer_list *timer, *next;
- cputime_t ptime = cputime_add(utime, stime);
+ cputime_t ptime = utime + stime;
list_for_each_entry_safe(timer, next, head, entry) {
list_del_init(&timer->entry);
- if (cputime_lt(timer->expires.cpu, ptime)) {
- timer->expires.cpu = cputime_zero;
+ if (timer->expires.cpu < ptime) {
+ timer->expires.cpu = 0;
} else {
- timer->expires.cpu = cputime_sub(timer->expires.cpu,
- ptime);
+ timer->expires.cpu -= ptime;
}
}
++head;
list_for_each_entry_safe(timer, next, head, entry) {
list_del_init(&timer->entry);
- if (cputime_lt(timer->expires.cpu, utime)) {
- timer->expires.cpu = cputime_zero;
+ if (timer->expires.cpu < utime) {
+ timer->expires.cpu = 0;
} else {
- timer->expires.cpu = cputime_sub(timer->expires.cpu,
- utime);
+ timer->expires.cpu -= utime;
}
}
struct signal_struct *const sig = tsk->signal;
cleanup_timers(tsk->signal->cpu_timers,
- cputime_add(tsk->utime, sig->utime),
- cputime_add(tsk->stime, sig->stime),
+ tsk->utime + sig->utime, tsk->stime + sig->stime,
tsk->se.sum_exec_runtime + sig->sum_sched_runtime);
}
static inline int expires_gt(cputime_t expires, cputime_t new_exp)
{
- return cputime_eq(expires, cputime_zero) ||
- cputime_gt(expires, new_exp);
+ return expires == 0 || expires > new_exp;
}
/*
default:
return -EINVAL;
case CPUCLOCK_PROF:
- cpu->cpu = cputime_add(cputime.utime, cputime.stime);
+ cpu->cpu = cputime.utime + cputime.stime;
break;
case CPUCLOCK_VIRT:
cpu->cpu = cputime.utime;
unsigned long soft;
maxfire = 20;
- tsk->cputime_expires.prof_exp = cputime_zero;
+ tsk->cputime_expires.prof_exp = 0;
while (!list_empty(timers)) {
struct cpu_timer_list *t = list_first_entry(timers,
struct cpu_timer_list,
entry);
- if (!--maxfire || cputime_lt(prof_ticks(tsk), t->expires.cpu)) {
+ if (!--maxfire || prof_ticks(tsk) < t->expires.cpu) {
tsk->cputime_expires.prof_exp = t->expires.cpu;
break;
}
++timers;
maxfire = 20;
- tsk->cputime_expires.virt_exp = cputime_zero;
+ tsk->cputime_expires.virt_exp = 0;
while (!list_empty(timers)) {
struct cpu_timer_list *t = list_first_entry(timers,
struct cpu_timer_list,
entry);
- if (!--maxfire || cputime_lt(virt_ticks(tsk), t->expires.cpu)) {
+ if (!--maxfire || virt_ticks(tsk) < t->expires.cpu) {
tsk->cputime_expires.virt_exp = t->expires.cpu;
break;
}
static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it,
cputime_t *expires, cputime_t cur_time, int signo)
{
- if (cputime_eq(it->expires, cputime_zero))
+ if (!it->expires)
return;
- if (cputime_ge(cur_time, it->expires)) {
- if (!cputime_eq(it->incr, cputime_zero)) {
- it->expires = cputime_add(it->expires, it->incr);
+ if (cur_time >= it->expires) {
+ if (it->incr) {
+ it->expires += it->incr;
it->error += it->incr_error;
if (it->error >= onecputick) {
- it->expires = cputime_sub(it->expires,
- cputime_one_jiffy);
+ it->expires -= cputime_one_jiffy;
it->error -= onecputick;
}
} else {
- it->expires = cputime_zero;
+ it->expires = 0;
}
trace_itimer_expire(signo == SIGPROF ?
__group_send_sig_info(signo, SEND_SIG_PRIV, tsk);
}
- if (!cputime_eq(it->expires, cputime_zero) &&
- (cputime_eq(*expires, cputime_zero) ||
- cputime_lt(it->expires, *expires))) {
+ if (it->expires && (!*expires || it->expires < *expires)) {
*expires = it->expires;
}
}
*/
static inline int task_cputime_zero(const struct task_cputime *cputime)
{
- if (cputime_eq(cputime->utime, cputime_zero) &&
- cputime_eq(cputime->stime, cputime_zero) &&
- cputime->sum_exec_runtime == 0)
+ if (!cputime->utime && !cputime->stime && !cputime->sum_exec_runtime)
return 1;
return 0;
}
*/
thread_group_cputimer(tsk, &cputime);
utime = cputime.utime;
- ptime = cputime_add(utime, cputime.stime);
+ ptime = utime + cputime.stime;
sum_sched_runtime = cputime.sum_exec_runtime;
maxfire = 20;
- prof_expires = cputime_zero;
+ prof_expires = 0;
while (!list_empty(timers)) {
struct cpu_timer_list *tl = list_first_entry(timers,
struct cpu_timer_list,
entry);
- if (!--maxfire || cputime_lt(ptime, tl->expires.cpu)) {
+ if (!--maxfire || ptime < tl->expires.cpu) {
prof_expires = tl->expires.cpu;
break;
}
++timers;
maxfire = 20;
- virt_expires = cputime_zero;
+ virt_expires = 0;
while (!list_empty(timers)) {
struct cpu_timer_list *tl = list_first_entry(timers,
struct cpu_timer_list,
entry);
- if (!--maxfire || cputime_lt(utime, tl->expires.cpu)) {
+ if (!--maxfire || utime < tl->expires.cpu) {
virt_expires = tl->expires.cpu;
break;
}
}
}
x = secs_to_cputime(soft);
- if (cputime_eq(prof_expires, cputime_zero) ||
- cputime_lt(x, prof_expires)) {
+ if (!prof_expires || x < prof_expires) {
prof_expires = x;
}
}
static inline int task_cputime_expired(const struct task_cputime *sample,
const struct task_cputime *expires)
{
- if (!cputime_eq(expires->utime, cputime_zero) &&
- cputime_ge(sample->utime, expires->utime))
+ if (expires->utime && sample->utime >= expires->utime)
return 1;
- if (!cputime_eq(expires->stime, cputime_zero) &&
- cputime_ge(cputime_add(sample->utime, sample->stime),
- expires->stime))
+ if (expires->stime && sample->utime + sample->stime >= expires->stime)
return 1;
if (expires->sum_exec_runtime != 0 &&
sample->sum_exec_runtime >= expires->sum_exec_runtime)
* it to be relative, *newval argument is relative and we update
* it to be absolute.
*/
- if (!cputime_eq(*oldval, cputime_zero)) {
- if (cputime_le(*oldval, now.cpu)) {
+ if (*oldval) {
+ if (*oldval <= now.cpu) {
/* Just about to fire. */
*oldval = cputime_one_jiffy;
} else {
- *oldval = cputime_sub(*oldval, now.cpu);
+ *oldval -= now.cpu;
}
}
- if (cputime_eq(*newval, cputime_zero))
+ if (!*newval)
return;
- *newval = cputime_add(*newval, now.cpu);
+ *newval += now.cpu;
}
/*
--- /dev/null
+ifdef CONFIG_FUNCTION_TRACER
+CFLAGS_REMOVE_clock.o = -pg
+endif
+
+ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
+# According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
+# needed for x86 only. Why this used to be enabled for all architectures is beyond
+# me. I suspect most platforms don't need this, but until we know that for sure
+# I turn this off for IA-64 only. Andreas Schwab says it's also needed on m68k
+# to get a correct value for the wait-channel (WCHAN in ps). --davidm
+CFLAGS_core.o := $(PROFILING) -fno-omit-frame-pointer
+endif
+
+obj-y += core.o clock.o idle_task.o fair.o rt.o stop_task.o
+obj-$(CONFIG_SMP) += cpupri.o
+obj-$(CONFIG_SCHED_AUTOGROUP) += auto_group.o
+obj-$(CONFIG_SCHEDSTATS) += stats.o
+obj-$(CONFIG_SCHED_DEBUG) += debug.o
+
+
#ifdef CONFIG_SCHED_AUTOGROUP
+#include "sched.h"
+
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/kallsyms.h>
#include <linux/utsname.h>
+#include <linux/security.h>
+#include <linux/export.h>
unsigned int __read_mostly sysctl_sched_autogroup_enabled = 1;
static struct autogroup autogroup_default;
static atomic_t autogroup_seq_nr;
-static void __init autogroup_init(struct task_struct *init_task)
+void __init autogroup_init(struct task_struct *init_task)
{
autogroup_default.tg = &root_task_group;
kref_init(&autogroup_default.kref);
init_task->signal->autogroup = &autogroup_default;
}
-static inline void autogroup_free(struct task_group *tg)
+void autogroup_free(struct task_group *tg)
{
kfree(tg->autogroup);
}
return ag;
}
-#ifdef CONFIG_RT_GROUP_SCHED
-static void free_rt_sched_group(struct task_group *tg);
-#endif
-
static inline struct autogroup *autogroup_create(void)
{
struct autogroup *ag = kzalloc(sizeof(*ag), GFP_KERNEL);
return autogroup_kref_get(&autogroup_default);
}
-static inline bool
-task_wants_autogroup(struct task_struct *p, struct task_group *tg)
+bool task_wants_autogroup(struct task_struct *p, struct task_group *tg)
{
if (tg != &root_task_group)
return false;
return true;
}
-static inline bool task_group_is_autogroup(struct task_group *tg)
-{
- return !!tg->autogroup;
-}
-
-static inline struct task_group *
-autogroup_task_group(struct task_struct *p, struct task_group *tg)
-{
- int enabled = ACCESS_ONCE(sysctl_sched_autogroup_enabled);
-
- if (enabled && task_wants_autogroup(p, tg))
- return p->signal->autogroup->tg;
-
- return tg;
-}
-
static void
autogroup_move_group(struct task_struct *p, struct autogroup *ag)
{
#endif /* CONFIG_PROC_FS */
#ifdef CONFIG_SCHED_DEBUG
-static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
+int autogroup_path(struct task_group *tg, char *buf, int buflen)
{
if (!task_group_is_autogroup(tg))
return 0;
#ifdef CONFIG_SCHED_AUTOGROUP
+#include <linux/kref.h>
+#include <linux/rwsem.h>
+
struct autogroup {
/*
* reference doesn't mean how many thread attach to this
int nice;
};
-static inline bool task_group_is_autogroup(struct task_group *tg);
+extern void autogroup_init(struct task_struct *init_task);
+extern void autogroup_free(struct task_group *tg);
+
+static inline bool task_group_is_autogroup(struct task_group *tg)
+{
+ return !!tg->autogroup;
+}
+
+extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
+
static inline struct task_group *
-autogroup_task_group(struct task_struct *p, struct task_group *tg);
+autogroup_task_group(struct task_struct *p, struct task_group *tg)
+{
+ int enabled = ACCESS_ONCE(sysctl_sched_autogroup_enabled);
+
+ if (enabled && task_wants_autogroup(p, tg))
+ return p->signal->autogroup->tg;
+
+ return tg;
+}
+
+extern int autogroup_path(struct task_group *tg, char *buf, int buflen);
#else /* !CONFIG_SCHED_AUTOGROUP */
/*
- * kernel/sched.c
+ * kernel/sched/core.c
*
* Kernel scheduler and related syscalls
*
#include <linux/percpu.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
-#include <linux/stop_machine.h>
#include <linux/sysctl.h>
#include <linux/syscalls.h>
#include <linux/times.h>
#include <asm/tlb.h>
#include <asm/irq_regs.h>
-#include <asm/mutex.h>
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#endif
-#include "sched_cpupri.h"
-#include "workqueue_sched.h"
-#include "sched_autogroup.h"
+#include "sched.h"
+#include "../workqueue_sched.h"
#define CREATE_TRACE_POINTS
#include <trace/events/sched.h>
-/*
- * Convert user-nice values [ -20 ... 0 ... 19 ]
- * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
- * and back.
- */
-#define NICE_TO_PRIO(nice) (MAX_RT_PRIO + (nice) + 20)
-#define PRIO_TO_NICE(prio) ((prio) - MAX_RT_PRIO - 20)
-#define TASK_NICE(p) PRIO_TO_NICE((p)->static_prio)
-
-/*
- * 'User priority' is the nice value converted to something we
- * can work with better when scaling various scheduler parameters,
- * it's a [ 0 ... 39 ] range.
- */
-#define USER_PRIO(p) ((p)-MAX_RT_PRIO)
-#define TASK_USER_PRIO(p) USER_PRIO((p)->static_prio)
-#define MAX_USER_PRIO (USER_PRIO(MAX_PRIO))
-
-/*
- * Helpers for converting nanosecond timing to jiffy resolution
- */
-#define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ))
-
-#define NICE_0_LOAD SCHED_LOAD_SCALE
-#define NICE_0_SHIFT SCHED_LOAD_SHIFT
-
-/*
- * These are the 'tuning knobs' of the scheduler:
- *
- * default timeslice is 100 msecs (used only for SCHED_RR tasks).
- * Timeslices get refilled after they expire.
- */
-#define DEF_TIMESLICE (100 * HZ / 1000)
-
-/*
- * single value that denotes runtime == period, ie unlimited time.
- */
-#define RUNTIME_INF ((u64)~0ULL)
-
-static inline int rt_policy(int policy)
-{
- if (policy == SCHED_FIFO || policy == SCHED_RR)
- return 1;
- return 0;
-}
-
-static inline int task_has_rt_policy(struct task_struct *p)
-{
- return rt_policy(p->policy);
-}
-
-/*
- * This is the priority-queue data structure of the RT scheduling class:
- */
-struct rt_prio_array {
- DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */
- struct list_head queue[MAX_RT_PRIO];
-};
-
-struct rt_bandwidth {
- /* nests inside the rq lock: */
- raw_spinlock_t rt_runtime_lock;
- ktime_t rt_period;
- u64 rt_runtime;
- struct hrtimer rt_period_timer;
-};
-
-static struct rt_bandwidth def_rt_bandwidth;
-
-static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun);
-
-static enum hrtimer_restart sched_rt_period_timer(struct hrtimer *timer)
-{
- struct rt_bandwidth *rt_b =
- container_of(timer, struct rt_bandwidth, rt_period_timer);
- ktime_t now;
- int overrun;
- int idle = 0;
-
- for (;;) {
- now = hrtimer_cb_get_time(timer);
- overrun = hrtimer_forward(timer, now, rt_b->rt_period);
-
- if (!overrun)
- break;
-
- idle = do_sched_rt_period_timer(rt_b, overrun);
- }
-
- return idle ? HRTIMER_NORESTART : HRTIMER_RESTART;
-}
-
-static
-void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime)
-{
- rt_b->rt_period = ns_to_ktime(period);
- rt_b->rt_runtime = runtime;
-
- raw_spin_lock_init(&rt_b->rt_runtime_lock);
-
- hrtimer_init(&rt_b->rt_period_timer,
- CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- rt_b->rt_period_timer.function = sched_rt_period_timer;
-}
-
-static inline int rt_bandwidth_enabled(void)
-{
- return sysctl_sched_rt_runtime >= 0;
-}
-
-static void start_bandwidth_timer(struct hrtimer *period_timer, ktime_t period)
+void start_bandwidth_timer(struct hrtimer *period_timer, ktime_t period)
{
unsigned long delta;
ktime_t soft, hard, now;
}
}
-static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
-{
- if (!rt_bandwidth_enabled() || rt_b->rt_runtime == RUNTIME_INF)
- return;
-
- if (hrtimer_active(&rt_b->rt_period_timer))
- return;
-
- raw_spin_lock(&rt_b->rt_runtime_lock);
- start_bandwidth_timer(&rt_b->rt_period_timer, rt_b->rt_period);
- raw_spin_unlock(&rt_b->rt_runtime_lock);
-}
-
-#ifdef CONFIG_RT_GROUP_SCHED
-static void destroy_rt_bandwidth(struct rt_bandwidth *rt_b)
-{
- hrtimer_cancel(&rt_b->rt_period_timer);
-}
-#endif
-
-/*
- * sched_domains_mutex serializes calls to init_sched_domains,
- * detach_destroy_domains and partition_sched_domains.
- */
-static DEFINE_MUTEX(sched_domains_mutex);
-
-#ifdef CONFIG_CGROUP_SCHED
-
-#include <linux/cgroup.h>
-
-struct cfs_rq;
-
-static LIST_HEAD(task_groups);
-
-struct cfs_bandwidth {
-#ifdef CONFIG_CFS_BANDWIDTH
- raw_spinlock_t lock;
- ktime_t period;
- u64 quota, runtime;
- s64 hierarchal_quota;
- u64 runtime_expires;
-
- int idle, timer_active;
- struct hrtimer period_timer, slack_timer;
- struct list_head throttled_cfs_rq;
-
- /* statistics */
- int nr_periods, nr_throttled;
- u64 throttled_time;
-#endif
-};
-
-/* task group related information */
-struct task_group {
- struct cgroup_subsys_state css;
-
-#ifdef CONFIG_FAIR_GROUP_SCHED
- /* schedulable entities of this group on each cpu */
- struct sched_entity **se;
- /* runqueue "owned" by this group on each cpu */
- struct cfs_rq **cfs_rq;
- unsigned long shares;
-
- atomic_t load_weight;
-#endif
-
-#ifdef CONFIG_RT_GROUP_SCHED
- struct sched_rt_entity **rt_se;
- struct rt_rq **rt_rq;
-
- struct rt_bandwidth rt_bandwidth;
-#endif
-
- struct rcu_head rcu;
- struct list_head list;
-
- struct task_group *parent;
- struct list_head siblings;
- struct list_head children;
-
-#ifdef CONFIG_SCHED_AUTOGROUP
- struct autogroup *autogroup;
-#endif
-
- struct cfs_bandwidth cfs_bandwidth;
-};
-
-/* task_group_lock serializes the addition/removal of task groups */
-static DEFINE_SPINLOCK(task_group_lock);
-
-#ifdef CONFIG_FAIR_GROUP_SCHED
-
-# define ROOT_TASK_GROUP_LOAD NICE_0_LOAD
-
-/*
- * A weight of 0 or 1 can cause arithmetics problems.
- * A weight of a cfs_rq is the sum of weights of which entities
- * are queued on this cfs_rq, so a weight of a entity should not be
- * too large, so as the shares value of a task group.
- * (The default weight is 1024 - so there's no practical
- * limitation from this.)
- */
-#define MIN_SHARES (1UL << 1)
-#define MAX_SHARES (1UL << 18)
-
-static int root_task_group_load = ROOT_TASK_GROUP_LOAD;
-#endif
-
-/* Default task group.
- * Every task in system belong to this group at bootup.
- */
-struct task_group root_task_group;
-
-#endif /* CONFIG_CGROUP_SCHED */
-
-/* CFS-related fields in a runqueue */
-struct cfs_rq {
- struct load_weight load;
- unsigned long nr_running, h_nr_running;
-
- u64 exec_clock;
- u64 min_vruntime;
-#ifndef CONFIG_64BIT
- u64 min_vruntime_copy;
-#endif
-
- struct rb_root tasks_timeline;
- struct rb_node *rb_leftmost;
-
- struct list_head tasks;
- struct list_head *balance_iterator;
-
- /*
- * 'curr' points to currently running entity on this cfs_rq.
- * It is set to NULL otherwise (i.e when none are currently running).
- */
- struct sched_entity *curr, *next, *last, *skip;
-
-#ifdef CONFIG_SCHED_DEBUG
- unsigned int nr_spread_over;
-#endif
-
-#ifdef CONFIG_FAIR_GROUP_SCHED
- struct rq *rq; /* cpu runqueue to which this cfs_rq is attached */
-
- /*
- * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in
- * a hierarchy). Non-leaf lrqs hold other higher schedulable entities
- * (like users, containers etc.)
- *
- * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a cpu. This
- * list is used during load balance.
- */
- int on_list;
- struct list_head leaf_cfs_rq_list;
- struct task_group *tg; /* group that "owns" this runqueue */
-
-#ifdef CONFIG_SMP
- /*
- * the part of load.weight contributed by tasks
- */
- unsigned long task_weight;
-
- /*
- * h_load = weight * f(tg)
- *
- * Where f(tg) is the recursive weight fraction assigned to
- * this group.
- */
- unsigned long h_load;
-
- /*
- * Maintaining per-cpu shares distribution for group scheduling
- *
- * load_stamp is the last time we updated the load average
- * load_last is the last time we updated the load average and saw load
- * load_unacc_exec_time is currently unaccounted execution time
- */
- u64 load_avg;
- u64 load_period;
- u64 load_stamp, load_last, load_unacc_exec_time;
-
- unsigned long load_contribution;
-#endif
-#ifdef CONFIG_CFS_BANDWIDTH
- int runtime_enabled;
- u64 runtime_expires;
- s64 runtime_remaining;
-
- u64 throttled_timestamp;
- int throttled, throttle_count;
- struct list_head throttled_list;
-#endif
-#endif
-};
-
-#ifdef CONFIG_FAIR_GROUP_SCHED
-#ifdef CONFIG_CFS_BANDWIDTH
-static inline struct cfs_bandwidth *tg_cfs_bandwidth(struct task_group *tg)
-{
- return &tg->cfs_bandwidth;
-}
-
-static inline u64 default_cfs_period(void);
-static int do_sched_cfs_period_timer(struct cfs_bandwidth *cfs_b, int overrun);
-static void do_sched_cfs_slack_timer(struct cfs_bandwidth *cfs_b);
-
-static enum hrtimer_restart sched_cfs_slack_timer(struct hrtimer *timer)
-{
- struct cfs_bandwidth *cfs_b =
- container_of(timer, struct cfs_bandwidth, slack_timer);
- do_sched_cfs_slack_timer(cfs_b);
-
- return HRTIMER_NORESTART;
-}
-
-static enum hrtimer_restart sched_cfs_period_timer(struct hrtimer *timer)
-{
- struct cfs_bandwidth *cfs_b =
- container_of(timer, struct cfs_bandwidth, period_timer);
- ktime_t now;
- int overrun;
- int idle = 0;
-
- for (;;) {
- now = hrtimer_cb_get_time(timer);
- overrun = hrtimer_forward(timer, now, cfs_b->period);
-
- if (!overrun)
- break;
-
- idle = do_sched_cfs_period_timer(cfs_b, overrun);
- }
-
- return idle ? HRTIMER_NORESTART : HRTIMER_RESTART;
-}
-
-static void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
-{
- raw_spin_lock_init(&cfs_b->lock);
- cfs_b->runtime = 0;
- cfs_b->quota = RUNTIME_INF;
- cfs_b->period = ns_to_ktime(default_cfs_period());
-
- INIT_LIST_HEAD(&cfs_b->throttled_cfs_rq);
- hrtimer_init(&cfs_b->period_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- cfs_b->period_timer.function = sched_cfs_period_timer;
- hrtimer_init(&cfs_b->slack_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- cfs_b->slack_timer.function = sched_cfs_slack_timer;
-}
-
-static void init_cfs_rq_runtime(struct cfs_rq *cfs_rq)
-{
- cfs_rq->runtime_enabled = 0;
- INIT_LIST_HEAD(&cfs_rq->throttled_list);
-}
-
-/* requires cfs_b->lock, may release to reprogram timer */
-static void __start_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
-{
- /*
- * The timer may be active because we're trying to set a new bandwidth
- * period or because we're racing with the tear-down path
- * (timer_active==0 becomes visible before the hrtimer call-back
- * terminates). In either case we ensure that it's re-programmed
- */
- while (unlikely(hrtimer_active(&cfs_b->period_timer))) {
- raw_spin_unlock(&cfs_b->lock);
- /* ensure cfs_b->lock is available while we wait */
- hrtimer_cancel(&cfs_b->period_timer);
-
- raw_spin_lock(&cfs_b->lock);
- /* if someone else restarted the timer then we're done */
- if (cfs_b->timer_active)
- return;
- }
-
- cfs_b->timer_active = 1;
- start_bandwidth_timer(&cfs_b->period_timer, cfs_b->period);
-}
-
-static void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
-{
- hrtimer_cancel(&cfs_b->period_timer);
- hrtimer_cancel(&cfs_b->slack_timer);
-}
-#else
-static void init_cfs_rq_runtime(struct cfs_rq *cfs_rq) {}
-static void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
-static void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
-
-static inline struct cfs_bandwidth *tg_cfs_bandwidth(struct task_group *tg)
-{
- return NULL;
-}
-#endif /* CONFIG_CFS_BANDWIDTH */
-#endif /* CONFIG_FAIR_GROUP_SCHED */
-
-/* Real-Time classes' related field in a runqueue: */
-struct rt_rq {
- struct rt_prio_array active;
- unsigned long rt_nr_running;
-#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
- struct {
- int curr; /* highest queued rt task prio */
-#ifdef CONFIG_SMP
- int next; /* next highest */
-#endif
- } highest_prio;
-#endif
-#ifdef CONFIG_SMP
- unsigned long rt_nr_migratory;
- unsigned long rt_nr_total;
- int overloaded;
- struct plist_head pushable_tasks;
-#endif
- int rt_throttled;
- u64 rt_time;
- u64 rt_runtime;
- /* Nests inside the rq lock: */
- raw_spinlock_t rt_runtime_lock;
-
-#ifdef CONFIG_RT_GROUP_SCHED
- unsigned long rt_nr_boosted;
-
- struct rq *rq;
- struct list_head leaf_rt_rq_list;
- struct task_group *tg;
-#endif
-};
-
-#ifdef CONFIG_SMP
-
-/*
- * We add the notion of a root-domain which will be used to define per-domain
- * variables. Each exclusive cpuset essentially defines an island domain by
- * fully partitioning the member cpus from any other cpuset. Whenever a new
- * exclusive cpuset is created, we also create and attach a new root-domain
- * object.
- *
- */
-struct root_domain {
- atomic_t refcount;
- atomic_t rto_count;
- struct rcu_head rcu;
- cpumask_var_t span;
- cpumask_var_t online;
-
- /*
- * The "RT overload" flag: it gets set if a CPU has more than
- * one runnable RT task.
- */
- cpumask_var_t rto_mask;
- struct cpupri cpupri;
-};
-
-/*
- * By default the system creates a single root-domain with all cpus as
- * members (mimicking the global state we have today).
- */
-static struct root_domain def_root_domain;
-
-#endif /* CONFIG_SMP */
-
-/*
- * This is the main, per-CPU runqueue data structure.
- *
- * Locking rule: those places that want to lock multiple runqueues
- * (such as the load balancing or the thread migration code), lock
- * acquire operations must be ordered by ascending &runqueue.
- */
-struct rq {
- /* runqueue lock: */
- raw_spinlock_t lock;
-
- /*
- * nr_running and cpu_load should be in the same cacheline because
- * remote CPUs use both these fields when doing load calculation.
- */
- unsigned long nr_running;
- #define CPU_LOAD_IDX_MAX 5
- unsigned long cpu_load[CPU_LOAD_IDX_MAX];
- unsigned long last_load_update_tick;
-#ifdef CONFIG_NO_HZ
- u64 nohz_stamp;
- unsigned char nohz_balance_kick;
-#endif
- int skip_clock_update;
-
- /* capture load from *all* tasks on this cpu: */
- struct load_weight load;
- unsigned long nr_load_updates;
- u64 nr_switches;
-
- struct cfs_rq cfs;
- struct rt_rq rt;
-
-#ifdef CONFIG_FAIR_GROUP_SCHED
- /* list of leaf cfs_rq on this cpu: */
- struct list_head leaf_cfs_rq_list;
-#endif
-#ifdef CONFIG_RT_GROUP_SCHED
- struct list_head leaf_rt_rq_list;
-#endif
-
- /*
- * This is part of a global counter where only the total sum
- * over all CPUs matters. A task can increase this counter on
- * one CPU and if it got migrated afterwards it may decrease
- * it on another CPU. Always updated under the runqueue lock:
- */
- unsigned long nr_uninterruptible;
-
- struct task_struct *curr, *idle, *stop;
- unsigned long next_balance;
- struct mm_struct *prev_mm;
-
- u64 clock;
- u64 clock_task;
-
- atomic_t nr_iowait;
-
-#ifdef CONFIG_SMP
- struct root_domain *rd;
- struct sched_domain *sd;
-
- unsigned long cpu_power;
-
- unsigned char idle_balance;
- /* For active balancing */
- int post_schedule;
- int active_balance;
- int push_cpu;
- struct cpu_stop_work active_balance_work;
- /* cpu of this runqueue: */
- int cpu;
- int online;
-
- u64 rt_avg;
- u64 age_stamp;
- u64 idle_stamp;
- u64 avg_idle;
-#endif
-
-#ifdef CONFIG_IRQ_TIME_ACCOUNTING
- u64 prev_irq_time;
-#endif
-#ifdef CONFIG_PARAVIRT
- u64 prev_steal_time;
-#endif
-#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
- u64 prev_steal_time_rq;
-#endif
-
- /* calc_load related fields */
- unsigned long calc_load_update;
- long calc_load_active;
-
-#ifdef CONFIG_SCHED_HRTICK
-#ifdef CONFIG_SMP
- int hrtick_csd_pending;
- struct call_single_data hrtick_csd;
-#endif
- struct hrtimer hrtick_timer;
-#endif
-
-#ifdef CONFIG_SCHEDSTATS
- /* latency stats */
- struct sched_info rq_sched_info;
- unsigned long long rq_cpu_time;
- /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */
-
- /* sys_sched_yield() stats */
- unsigned int yld_count;
-
- /* schedule() stats */
- unsigned int sched_switch;
- unsigned int sched_count;
- unsigned int sched_goidle;
-
- /* try_to_wake_up() stats */
- unsigned int ttwu_count;
- unsigned int ttwu_local;
-#endif
-
-#ifdef CONFIG_SMP
- struct llist_head wake_list;
-#endif
-};
-
-static DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
-
-
-static void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags);
-
-static inline int cpu_of(struct rq *rq)
-{
-#ifdef CONFIG_SMP
- return rq->cpu;
-#else
- return 0;
-#endif
-}
-
-#define rcu_dereference_check_sched_domain(p) \
- rcu_dereference_check((p), \
- lockdep_is_held(&sched_domains_mutex))
-
-/*
- * The domain tree (rq->sd) is protected by RCU's quiescent state transition.
- * See detach_destroy_domains: synchronize_sched for details.
- *
- * The domain tree of any CPU may only be accessed from within
- * preempt-disabled sections.
- */
-#define for_each_domain(cpu, __sd) \
- for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); __sd; __sd = __sd->parent)
-
-#define cpu_rq(cpu) (&per_cpu(runqueues, (cpu)))
-#define this_rq() (&__get_cpu_var(runqueues))
-#define task_rq(p) cpu_rq(task_cpu(p))
-#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
-#define raw_rq() (&__raw_get_cpu_var(runqueues))
-
-#ifdef CONFIG_CGROUP_SCHED
-
-/*
- * Return the group to which this tasks belongs.
- *
- * We use task_subsys_state_check() and extend the RCU verification with
- * pi->lock and rq->lock because cpu_cgroup_attach() holds those locks for each
- * task it moves into the cgroup. Therefore by holding either of those locks,
- * we pin the task to the current cgroup.
- */
-static inline struct task_group *task_group(struct task_struct *p)
-{
- struct task_group *tg;
- struct cgroup_subsys_state *css;
-
- css = task_subsys_state_check(p, cpu_cgroup_subsys_id,
- lockdep_is_held(&p->pi_lock) ||
- lockdep_is_held(&task_rq(p)->lock));
- tg = container_of(css, struct task_group, css);
-
- return autogroup_task_group(p, tg);
-}
-
-/* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
-static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
-{
-#ifdef CONFIG_FAIR_GROUP_SCHED
- p->se.cfs_rq = task_group(p)->cfs_rq[cpu];
- p->se.parent = task_group(p)->se[cpu];
-#endif
-
-#ifdef CONFIG_RT_GROUP_SCHED
- p->rt.rt_rq = task_group(p)->rt_rq[cpu];
- p->rt.parent = task_group(p)->rt_se[cpu];
-#endif
-}
-
-#else /* CONFIG_CGROUP_SCHED */
-
-static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
-static inline struct task_group *task_group(struct task_struct *p)
-{
- return NULL;
-}
-
-#endif /* CONFIG_CGROUP_SCHED */
+DEFINE_MUTEX(sched_domains_mutex);
+DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
static void update_rq_clock_task(struct rq *rq, s64 delta);
-static void update_rq_clock(struct rq *rq)
+void update_rq_clock(struct rq *rq)
{
s64 delta;
}
/*
- * Tunables that become constants when CONFIG_SCHED_DEBUG is off:
- */
-#ifdef CONFIG_SCHED_DEBUG
-# define const_debug __read_mostly
-#else
-# define const_debug static const
-#endif
-
-/**
- * runqueue_is_locked - Returns true if the current cpu runqueue is locked
- * @cpu: the processor in question.
- *
- * This interface allows printk to be called with the runqueue lock
- * held and know whether or not it is OK to wake up the klogd.
- */
-int runqueue_is_locked(int cpu)
-{
- return raw_spin_is_locked(&cpu_rq(cpu)->lock);
-}
-
-/*
* Debugging: various feature bits
*/
#define SCHED_FEAT(name, enabled) \
- __SCHED_FEAT_##name ,
-
-enum {
-#include "sched_features.h"
-};
-
-#undef SCHED_FEAT
-
-#define SCHED_FEAT(name, enabled) \
(1UL << __SCHED_FEAT_##name) * enabled |
const_debug unsigned int sysctl_sched_features =
-#include "sched_features.h"
+#include "features.h"
0;
#undef SCHED_FEAT
#name ,
static __read_mostly char *sched_feat_names[] = {
-#include "sched_features.h"
+#include "features.h"
NULL
};
{
int i;
- for (i = 0; sched_feat_names[i]; i++) {
+ for (i = 0; i < __SCHED_FEAT_NR; i++) {
if (!(sysctl_sched_features & (1UL << i)))
seq_puts(m, "NO_");
seq_printf(m, "%s ", sched_feat_names[i]);
return 0;
}
+#ifdef HAVE_JUMP_LABEL
+
+#define jump_label_key__true jump_label_key_enabled
+#define jump_label_key__false jump_label_key_disabled
+
+#define SCHED_FEAT(name, enabled) \
+ jump_label_key__##enabled ,
+
+struct jump_label_key sched_feat_keys[__SCHED_FEAT_NR] = {
+#include "features.h"
+};
+
+#undef SCHED_FEAT
+
+static void sched_feat_disable(int i)
+{
+ if (jump_label_enabled(&sched_feat_keys[i]))
+ jump_label_dec(&sched_feat_keys[i]);
+}
+
+static void sched_feat_enable(int i)
+{
+ if (!jump_label_enabled(&sched_feat_keys[i]))
+ jump_label_inc(&sched_feat_keys[i]);
+}
+#else
+static void sched_feat_disable(int i) { };
+static void sched_feat_enable(int i) { };
+#endif /* HAVE_JUMP_LABEL */
+
static ssize_t
sched_feat_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
cmp += 3;
}
- for (i = 0; sched_feat_names[i]; i++) {
+ for (i = 0; i < __SCHED_FEAT_NR; i++) {
if (strcmp(cmp, sched_feat_names[i]) == 0) {
- if (neg)
+ if (neg) {
sysctl_sched_features &= ~(1UL << i);
- else
+ sched_feat_disable(i);
+ } else {
sysctl_sched_features |= (1UL << i);
+ sched_feat_enable(i);
+ }
break;
}
}
- if (!sched_feat_names[i])
+ if (i == __SCHED_FEAT_NR)
return -EINVAL;
*ppos += cnt;
return 0;
}
late_initcall(sched_init_debug);
-
-#endif
-
-#define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
+#endif /* CONFIG_SCHED_DEBUG */
/*
* Number of tasks to iterate in a single balance run.
*/
unsigned int sysctl_sched_rt_period = 1000000;
-static __read_mostly int scheduler_running;
+__read_mostly int scheduler_running;
/*
* part of the period that we allow rt tasks to run in us.
*/
int sysctl_sched_rt_runtime = 950000;
-static inline u64 global_rt_period(void)
-{
- return (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
-}
-
-static inline u64 global_rt_runtime(void)
-{
- if (sysctl_sched_rt_runtime < 0)
- return RUNTIME_INF;
- return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC;
-}
-
-#ifndef prepare_arch_switch
-# define prepare_arch_switch(next) do { } while (0)
-#endif
-#ifndef finish_arch_switch
-# define finish_arch_switch(prev) do { } while (0)
-#endif
-
-static inline int task_current(struct rq *rq, struct task_struct *p)
-{
- return rq->curr == p;
-}
-
-static inline int task_running(struct rq *rq, struct task_struct *p)
-{
-#ifdef CONFIG_SMP
- return p->on_cpu;
-#else
- return task_current(rq, p);
-#endif
-}
-
-#ifndef __ARCH_WANT_UNLOCKED_CTXSW
-static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next)
-{
-#ifdef CONFIG_SMP
- /*
- * We can optimise this out completely for !SMP, because the
- * SMP rebalancing from interrupt is the only thing that cares
- * here.
- */
- next->on_cpu = 1;
-#endif
-}
-
-static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
-{
-#ifdef CONFIG_SMP
- /*
- * After ->on_cpu is cleared, the task can be moved to a different CPU.
- * We must ensure this doesn't happen until the switch is completely
- * finished.
- */
- smp_wmb();
- prev->on_cpu = 0;
-#endif
-#ifdef CONFIG_DEBUG_SPINLOCK
- /* this is a valid case when another task releases the spinlock */
- rq->lock.owner = current;
-#endif
- /*
- * If we are tracking spinlock dependencies then we have to
- * fix up the runqueue lock - which gets 'carried over' from
- * prev into current:
- */
- spin_acquire(&rq->lock.dep_map, 0, 0, _THIS_IP_);
-
- raw_spin_unlock_irq(&rq->lock);
-}
-
-#else /* __ARCH_WANT_UNLOCKED_CTXSW */
-static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next)
-{
-#ifdef CONFIG_SMP
- /*
- * We can optimise this out completely for !SMP, because the
- * SMP rebalancing from interrupt is the only thing that cares
- * here.
- */
- next->on_cpu = 1;
-#endif
-#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
- raw_spin_unlock_irq(&rq->lock);
-#else
- raw_spin_unlock(&rq->lock);
-#endif
-}
-
-static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
-{
-#ifdef CONFIG_SMP
- /*
- * After ->on_cpu is cleared, the task can be moved to a different CPU.
- * We must ensure this doesn't happen until the switch is completely
- * finished.
- */
- smp_wmb();
- prev->on_cpu = 0;
-#endif
-#ifndef __ARCH_WANT_INTERRUPTS_ON_CTXSW
- local_irq_enable();
-#endif
-}
-#endif /* __ARCH_WANT_UNLOCKED_CTXSW */
/*
* __task_rq_lock - lock the rq @p resides on.
* rq->lock.
*/
-/*
- * Use hrtick when:
- * - enabled by features
- * - hrtimer is actually high res
- */
-static inline int hrtick_enabled(struct rq *rq)
-{
- if (!sched_feat(HRTICK))
- return 0;
- if (!cpu_active(cpu_of(rq)))
- return 0;
- return hrtimer_is_hres_active(&rq->hrtick_timer);
-}
-
static void hrtick_clear(struct rq *rq)
{
if (hrtimer_active(&rq->hrtick_timer))
*
* called with rq->lock held and irqs disabled
*/
-static void hrtick_start(struct rq *rq, u64 delay)
+void hrtick_start(struct rq *rq, u64 delay)
{
struct hrtimer *timer = &rq->hrtick_timer;
ktime_t time = ktime_add_ns(timer->base->get_time(), delay);
*
* called with rq->lock held and irqs disabled
*/
-static void hrtick_start(struct rq *rq, u64 delay)
+void hrtick_start(struct rq *rq, u64 delay)
{
__hrtimer_start_range_ns(&rq->hrtick_timer, ns_to_ktime(delay), 0,
HRTIMER_MODE_REL_PINNED, 0);
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif
-static void resched_task(struct task_struct *p)
+void resched_task(struct task_struct *p)
{
int cpu;
smp_send_reschedule(cpu);
}
-static void resched_cpu(int cpu)
+void resched_cpu(int cpu)
{
struct rq *rq = cpu_rq(cpu);
unsigned long flags;
smp_send_reschedule(cpu);
}
-static inline bool got_nohz_idle_kick(void)
-{
- return idle_cpu(smp_processor_id()) && this_rq()->nohz_balance_kick;
-}
-
-#else /* CONFIG_NO_HZ */
-
-static inline bool got_nohz_idle_kick(void)
-{
- return false;
-}
-
-#endif /* CONFIG_NO_HZ */
-
-static u64 sched_avg_period(void)
-{
- return (u64)sysctl_sched_time_avg * NSEC_PER_MSEC / 2;
-}
-
-static void sched_avg_update(struct rq *rq)
-{
- s64 period = sched_avg_period();
-
- while ((s64)(rq->clock - rq->age_stamp) > period) {
- /*
- * Inline assembly required to prevent the compiler
- * optimising this loop into a divmod call.
- * See __iter_div_u64_rem() for another example of this.
- */
- asm("" : "+rm" (rq->age_stamp));
- rq->age_stamp += period;
- rq->rt_avg /= 2;
- }
-}
-
-static void sched_rt_avg_update(struct rq *rq, u64 rt_delta)
-{
- rq->rt_avg += rt_delta;
- sched_avg_update(rq);
-}
-
-#else /* !CONFIG_SMP */
-static void resched_task(struct task_struct *p)
-{
- assert_raw_spin_locked(&task_rq(p)->lock);
- set_tsk_need_resched(p);
-}
-
-static void sched_rt_avg_update(struct rq *rq, u64 rt_delta)
-{
-}
-
-static void sched_avg_update(struct rq *rq)
-{
-}
-#endif /* CONFIG_SMP */
-
-#if BITS_PER_LONG == 32
-# define WMULT_CONST (~0UL)
-#else
-# define WMULT_CONST (1UL << 32)
-#endif
-
-#define WMULT_SHIFT 32
-
-/*
- * Shift right and round:
- */
-#define SRR(x, y) (((x) + (1UL << ((y) - 1))) >> (y))
-
-/*
- * delta *= weight / lw
- */
-static unsigned long
-calc_delta_mine(unsigned long delta_exec, unsigned long weight,
- struct load_weight *lw)
-{
- u64 tmp;
-
- /*
- * weight can be less than 2^SCHED_LOAD_RESOLUTION for task group sched
- * entities since MIN_SHARES = 2. Treat weight as 1 if less than
- * 2^SCHED_LOAD_RESOLUTION.
- */
- if (likely(weight > (1UL << SCHED_LOAD_RESOLUTION)))
- tmp = (u64)delta_exec * scale_load_down(weight);
- else
- tmp = (u64)delta_exec;
-
- if (!lw->inv_weight) {
- unsigned long w = scale_load_down(lw->weight);
-
- if (BITS_PER_LONG > 32 && unlikely(w >= WMULT_CONST))
- lw->inv_weight = 1;
- else if (unlikely(!w))
- lw->inv_weight = WMULT_CONST;
- else
- lw->inv_weight = WMULT_CONST / w;
- }
-
- /*
- * Check whether we'd overflow the 64-bit multiplication:
- */
- if (unlikely(tmp > WMULT_CONST))
- tmp = SRR(SRR(tmp, WMULT_SHIFT/2) * lw->inv_weight,
- WMULT_SHIFT/2);
- else
- tmp = SRR(tmp * lw->inv_weight, WMULT_SHIFT);
-
- return (unsigned long)min(tmp, (u64)(unsigned long)LONG_MAX);
-}
-
-static inline void update_load_add(struct load_weight *lw, unsigned long inc)
-{
- lw->weight += inc;
- lw->inv_weight = 0;
-}
-
-static inline void update_load_sub(struct load_weight *lw, unsigned long dec)
-{
- lw->weight -= dec;
- lw->inv_weight = 0;
-}
-
-static inline void update_load_set(struct load_weight *lw, unsigned long w)
+static inline bool got_nohz_idle_kick(void)
{
- lw->weight = w;
- lw->inv_weight = 0;
+ int cpu = smp_processor_id();
+ return idle_cpu(cpu) && test_bit(NOHZ_BALANCE_KICK, nohz_flags(cpu));
}
-/*
- * To aid in avoiding the subversion of "niceness" due to uneven distribution
- * of tasks with abnormal "nice" values across CPUs the contribution that
- * each task makes to its run queue's load is weighted according to its
- * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a
- * scaled version of the new time slice allocation that they receive on time
- * slice expiry etc.
- */
-
-#define WEIGHT_IDLEPRIO 3
-#define WMULT_IDLEPRIO 1431655765
-
-/*
- * Nice levels are multiplicative, with a gentle 10% change for every
- * nice level changed. I.e. when a CPU-bound task goes from nice 0 to
- * nice 1, it will get ~10% less CPU time than another CPU-bound task
- * that remained on nice 0.
- *
- * The "10% effect" is relative and cumulative: from _any_ nice level,
- * if you go up 1 level, it's -10% CPU usage, if you go down 1 level
- * it's +10% CPU usage. (to achieve that we use a multiplier of 1.25.
- * If a task goes up by ~10% and another task goes down by ~10% then
- * the relative distance between them is ~25%.)
- */
-static const int prio_to_weight[40] = {
- /* -20 */ 88761, 71755, 56483, 46273, 36291,
- /* -15 */ 29154, 23254, 18705, 14949, 11916,
- /* -10 */ 9548, 7620, 6100, 4904, 3906,
- /* -5 */ 3121, 2501, 1991, 1586, 1277,
- /* 0 */ 1024, 820, 655, 526, 423,
- /* 5 */ 335, 272, 215, 172, 137,
- /* 10 */ 110, 87, 70, 56, 45,
- /* 15 */ 36, 29, 23, 18, 15,
-};
-
-/*
- * Inverse (2^32/x) values of the prio_to_weight[] array, precalculated.
- *
- * In cases where the weight does not change often, we can use the
- * precalculated inverse to speed up arithmetics by turning divisions
- * into multiplications:
- */
-static const u32 prio_to_wmult[40] = {
- /* -20 */ 48388, 59856, 76040, 92818, 118348,
- /* -15 */ 147320, 184698, 229616, 287308, 360437,
- /* -10 */ 449829, 563644, 704093, 875809, 1099582,
- /* -5 */ 1376151, 1717300, 2157191, 2708050, 3363326,
- /* 0 */ 4194304, 5237765, 6557202, 8165337, 10153587,
- /* 5 */ 12820798, 15790321, 19976592, 24970740, 31350126,
- /* 10 */ 39045157, 49367440, 61356676, 76695844, 95443717,
- /* 15 */ 119304647, 148102320, 186737708, 238609294, 286331153,
-};
-
-/* Time spent by the tasks of the cpu accounting group executing in ... */
-enum cpuacct_stat_index {
- CPUACCT_STAT_USER, /* ... user mode */
- CPUACCT_STAT_SYSTEM, /* ... kernel mode */
+#else /* CONFIG_NO_HZ */
- CPUACCT_STAT_NSTATS,
-};
+static inline bool got_nohz_idle_kick(void)
+{
+ return false;
+}
-#ifdef CONFIG_CGROUP_CPUACCT
-static void cpuacct_charge(struct task_struct *tsk, u64 cputime);
-static void cpuacct_update_stats(struct task_struct *tsk,
- enum cpuacct_stat_index idx, cputime_t val);
-#else
-static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {}
-static inline void cpuacct_update_stats(struct task_struct *tsk,
- enum cpuacct_stat_index idx, cputime_t val) {}
-#endif
+#endif /* CONFIG_NO_HZ */
-static inline void inc_cpu_load(struct rq *rq, unsigned long load)
+void sched_avg_update(struct rq *rq)
{
- update_load_add(&rq->load, load);
+ s64 period = sched_avg_period();
+
+ while ((s64)(rq->clock - rq->age_stamp) > period) {
+ /*
+ * Inline assembly required to prevent the compiler
+ * optimising this loop into a divmod call.
+ * See __iter_div_u64_rem() for another example of this.
+ */
+ asm("" : "+rm" (rq->age_stamp));
+ rq->age_stamp += period;
+ rq->rt_avg /= 2;
+ }
}
-static inline void dec_cpu_load(struct rq *rq, unsigned long load)
+#else /* !CONFIG_SMP */
+void resched_task(struct task_struct *p)
{
- update_load_sub(&rq->load, load);
+ assert_raw_spin_locked(&task_rq(p)->lock);
+ set_tsk_need_resched(p);
}
+#endif /* CONFIG_SMP */
#if defined(CONFIG_RT_GROUP_SCHED) || (defined(CONFIG_FAIR_GROUP_SCHED) && \
(defined(CONFIG_SMP) || defined(CONFIG_CFS_BANDWIDTH)))
-typedef int (*tg_visitor)(struct task_group *, void *);
-
/*
* Iterate task_group tree rooted at *from, calling @down when first entering a
* node and @up when leaving it for the final time.
*
* Caller must hold rcu_lock or sufficient equivalent.
*/
-static int walk_tg_tree_from(struct task_group *from,
+int walk_tg_tree_from(struct task_group *from,
tg_visitor down, tg_visitor up, void *data)
{
struct task_group *parent, *child;
return ret;
}
-/*
- * Iterate the full tree, calling @down when first entering a node and @up when
- * leaving it for the final time.
- *
- * Caller must hold rcu_lock or sufficient equivalent.
- */
-
-static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data)
-{
- return walk_tg_tree_from(&root_task_group, down, up, data);
-}
-
-static int tg_nop(struct task_group *tg, void *data)
-{
- return 0;
-}
-#endif
-
-#ifdef CONFIG_SMP
-/* Used instead of source_load when we know the type == 0 */
-static unsigned long weighted_cpuload(const int cpu)
-{
- return cpu_rq(cpu)->load.weight;
-}
-
-/*
- * Return a low guess at the load of a migration-source cpu weighted
- * according to the scheduling class and "nice" value.
- *
- * We want to under-estimate the load of migration sources, to
- * balance conservatively.
- */
-static unsigned long source_load(int cpu, int type)
-{
- struct rq *rq = cpu_rq(cpu);
- unsigned long total = weighted_cpuload(cpu);
-
- if (type == 0 || !sched_feat(LB_BIAS))
- return total;
-
- return min(rq->cpu_load[type-1], total);
-}
-
-/*
- * Return a high guess at the load of a migration-target cpu weighted
- * according to the scheduling class and "nice" value.
- */
-static unsigned long target_load(int cpu, int type)
-{
- struct rq *rq = cpu_rq(cpu);
- unsigned long total = weighted_cpuload(cpu);
-
- if (type == 0 || !sched_feat(LB_BIAS))
- return total;
-
- return max(rq->cpu_load[type-1], total);
-}
-
-static unsigned long power_of(int cpu)
-{
- return cpu_rq(cpu)->cpu_power;
-}
-
-static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
-
-static unsigned long cpu_avg_load_per_task(int cpu)
+int tg_nop(struct task_group *tg, void *data)
{
- struct rq *rq = cpu_rq(cpu);
- unsigned long nr_running = ACCESS_ONCE(rq->nr_running);
-
- if (nr_running)
- return rq->load.weight / nr_running;
-
return 0;
}
-
-#ifdef CONFIG_PREEMPT
-
-static void double_rq_lock(struct rq *rq1, struct rq *rq2);
-
-/*
- * fair double_lock_balance: Safely acquires both rq->locks in a fair
- * way at the expense of forcing extra atomic operations in all
- * invocations. This assures that the double_lock is acquired using the
- * same underlying policy as the spinlock_t on this architecture, which
- * reduces latency compared to the unfair variant below. However, it
- * also adds more overhead and therefore may reduce throughput.
- */
-static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
- __releases(this_rq->lock)
- __acquires(busiest->lock)
- __acquires(this_rq->lock)
-{
- raw_spin_unlock(&this_rq->lock);
- double_rq_lock(this_rq, busiest);
-
- return 1;
-}
-
-#else
-/*
- * Unfair double_lock_balance: Optimizes throughput at the expense of
- * latency by eliminating extra atomic operations when the locks are
- * already in proper order on entry. This favors lower cpu-ids and will
- * grant the double lock to lower cpus over higher ids under contention,
- * regardless of entry order into the function.
- */
-static int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
- __releases(this_rq->lock)
- __acquires(busiest->lock)
- __acquires(this_rq->lock)
-{
- int ret = 0;
-
- if (unlikely(!raw_spin_trylock(&busiest->lock))) {
- if (busiest < this_rq) {
- raw_spin_unlock(&this_rq->lock);
- raw_spin_lock(&busiest->lock);
- raw_spin_lock_nested(&this_rq->lock,
- SINGLE_DEPTH_NESTING);
- ret = 1;
- } else
- raw_spin_lock_nested(&busiest->lock,
- SINGLE_DEPTH_NESTING);
- }
- return ret;
-}
-
-#endif /* CONFIG_PREEMPT */
-
-/*
- * double_lock_balance - lock the busiest runqueue, this_rq is locked already.
- */
-static int double_lock_balance(struct rq *this_rq, struct rq *busiest)
-{
- if (unlikely(!irqs_disabled())) {
- /* printk() doesn't work good under rq->lock */
- raw_spin_unlock(&this_rq->lock);
- BUG_ON(1);
- }
-
- return _double_lock_balance(this_rq, busiest);
-}
-
-static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
- __releases(busiest->lock)
-{
- raw_spin_unlock(&busiest->lock);
- lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
-}
-
-/*
- * double_rq_lock - safely lock two runqueues
- *
- * Note this does not disable interrupts like task_rq_lock,
- * you need to do so manually before calling.
- */
-static void double_rq_lock(struct rq *rq1, struct rq *rq2)
- __acquires(rq1->lock)
- __acquires(rq2->lock)
-{
- BUG_ON(!irqs_disabled());
- if (rq1 == rq2) {
- raw_spin_lock(&rq1->lock);
- __acquire(rq2->lock); /* Fake it out ;) */
- } else {
- if (rq1 < rq2) {
- raw_spin_lock(&rq1->lock);
- raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING);
- } else {
- raw_spin_lock(&rq2->lock);
- raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING);
- }
- }
-}
-
-/*
- * double_rq_unlock - safely unlock two runqueues
- *
- * Note this does not restore interrupts like task_rq_unlock,
- * you need to do so manually after calling.
- */
-static void double_rq_unlock(struct rq *rq1, struct rq *rq2)
- __releases(rq1->lock)
- __releases(rq2->lock)
-{
- raw_spin_unlock(&rq1->lock);
- if (rq1 != rq2)
- raw_spin_unlock(&rq2->lock);
- else
- __release(rq2->lock);
-}
-
-#else /* CONFIG_SMP */
-
-/*
- * double_rq_lock - safely lock two runqueues
- *
- * Note this does not disable interrupts like task_rq_lock,
- * you need to do so manually before calling.
- */
-static void double_rq_lock(struct rq *rq1, struct rq *rq2)
- __acquires(rq1->lock)
- __acquires(rq2->lock)
-{
- BUG_ON(!irqs_disabled());
- BUG_ON(rq1 != rq2);
- raw_spin_lock(&rq1->lock);
- __acquire(rq2->lock); /* Fake it out ;) */
-}
-
-/*
- * double_rq_unlock - safely unlock two runqueues
- *
- * Note this does not restore interrupts like task_rq_unlock,
- * you need to do so manually after calling.
- */
-static void double_rq_unlock(struct rq *rq1, struct rq *rq2)
- __releases(rq1->lock)
- __releases(rq2->lock)
-{
- BUG_ON(rq1 != rq2);
- raw_spin_unlock(&rq1->lock);
- __release(rq2->lock);
-}
-
-#endif
-
-static void calc_load_account_idle(struct rq *this_rq);
-static void update_sysctl(void);
-static int get_update_sysctl_factor(void);
-static void update_cpu_load(struct rq *this_rq);
-
-static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
-{
- set_task_rq(p, cpu);
-#ifdef CONFIG_SMP
- /*
- * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be
- * successfully executed on another CPU. We must ensure that updates of
- * per-task data have been completed by this moment.
- */
- smp_wmb();
- task_thread_info(p)->cpu = cpu;
#endif
-}
-
-static const struct sched_class rt_sched_class;
-
-#define sched_class_highest (&stop_sched_class)
-#define for_each_class(class) \
- for (class = sched_class_highest; class; class = class->next)
-
-#include "sched_stats.h"
-
-static void inc_nr_running(struct rq *rq)
-{
- rq->nr_running++;
-}
-static void dec_nr_running(struct rq *rq)
-{
- rq->nr_running--;
-}
+void update_cpu_load(struct rq *this_rq);
static void set_load_weight(struct task_struct *p)
{
/*
* activate_task - move a task to the runqueue.
*/
-static void activate_task(struct rq *rq, struct task_struct *p, int flags)
+void activate_task(struct rq *rq, struct task_struct *p, int flags)
{
if (task_contributes_to_load(p))
rq->nr_uninterruptible--;
/*
* deactivate_task - remove a task from the runqueue.
*/
-static void deactivate_task(struct rq *rq, struct task_struct *p, int flags)
+void deactivate_task(struct rq *rq, struct task_struct *p, int flags)
{
if (task_contributes_to_load(p))
rq->nr_uninterruptible++;
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
static int irqtime_account_hi_update(void)
{
- struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;
+ u64 *cpustat = kcpustat_this_cpu->cpustat;
unsigned long flags;
u64 latest_ns;
int ret = 0;
local_irq_save(flags);
latest_ns = this_cpu_read(cpu_hardirq_time);
- if (cputime64_gt(nsecs_to_cputime64(latest_ns), cpustat->irq))
+ if (nsecs_to_cputime64(latest_ns) > cpustat[CPUTIME_IRQ])
ret = 1;
local_irq_restore(flags);
return ret;
static int irqtime_account_si_update(void)
{
- struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;
+ u64 *cpustat = kcpustat_this_cpu->cpustat;
unsigned long flags;
u64 latest_ns;
int ret = 0;
local_irq_save(flags);
latest_ns = this_cpu_read(cpu_softirq_time);
- if (cputime64_gt(nsecs_to_cputime64(latest_ns), cpustat->softirq))
+ if (nsecs_to_cputime64(latest_ns) > cpustat[CPUTIME_SOFTIRQ])
ret = 1;
local_irq_restore(flags);
return ret;
#endif
-#include "sched_idletask.c"
-#include "sched_fair.c"
-#include "sched_rt.c"
-#include "sched_autogroup.c"
-#include "sched_stoptask.c"
-#ifdef CONFIG_SCHED_DEBUG
-# include "sched_debug.c"
-#endif
-
void sched_set_stop_task(int cpu, struct task_struct *stop)
{
struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
p->sched_class->prio_changed(rq, p, oldprio);
}
-static void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags)
+void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags)
{
const struct sched_class *class;
}
#ifdef CONFIG_SMP
-/*
- * Is this task likely cache-hot:
- */
-static int
-task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
-{
- s64 delta;
-
- if (p->sched_class != &fair_sched_class)
- return 0;
-
- if (unlikely(p->policy == SCHED_IDLE))
- return 0;
-
- /*
- * Buddy candidates are cache hot:
- */
- if (sched_feat(CACHE_HOT_BUDDY) && this_rq()->nr_running &&
- (&p->se == cfs_rq_of(&p->se)->next ||
- &p->se == cfs_rq_of(&p->se)->last))
- return 1;
-
- if (sysctl_sched_migration_cost == -1)
- return 1;
- if (sysctl_sched_migration_cost == 0)
- return 0;
-
- delta = now - p->se.exec_start;
-
- return delta < (s64)sysctl_sched_migration_cost;
-}
-
void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
{
#ifdef CONFIG_SCHED_DEBUG
}
#endif /* __ARCH_WANT_INTERRUPTS_ON_CTXSW */
+
+static inline int ttwu_share_cache(int this_cpu, int that_cpu)
+{
+ return per_cpu(sd_llc_id, this_cpu) == per_cpu(sd_llc_id, that_cpu);
+}
#endif /* CONFIG_SMP */
static void ttwu_queue(struct task_struct *p, int cpu)
struct rq *rq = cpu_rq(cpu);
#if defined(CONFIG_SMP)
- if (sched_feat(TTWU_QUEUE) && cpu != smp_processor_id()) {
+ if (sched_feat(TTWU_QUEUE) && !ttwu_share_cache(smp_processor_id(), cpu)) {
sched_clock_cpu(cpu); /* sync clocks x-cpu */
ttwu_queue_remote(p, cpu);
return;
local_irq_enable();
#endif /* __ARCH_WANT_INTERRUPTS_ON_CTXSW */
finish_lock_switch(rq, prev);
+ trace_sched_stat_sleeptime(current, rq->clock);
fire_sched_in_preempt_notifiers(current);
if (mm)
*/
static atomic_long_t calc_load_tasks_idle;
-static void calc_load_account_idle(struct rq *this_rq)
+void calc_load_account_idle(struct rq *this_rq)
{
long delta;
*/
}
#else
-static void calc_load_account_idle(struct rq *this_rq)
+void calc_load_account_idle(struct rq *this_rq)
{
}
* scheduler tick (TICK_NSEC). With tickless idle this will not be called
* every tick. We fix it up based on jiffies.
*/
-static void update_cpu_load(struct rq *this_rq)
+void update_cpu_load(struct rq *this_rq)
{
unsigned long this_load = this_rq->load.weight;
unsigned long curr_jiffies = jiffies;
#endif
DEFINE_PER_CPU(struct kernel_stat, kstat);
+DEFINE_PER_CPU(struct kernel_cpustat, kernel_cpustat);
EXPORT_PER_CPU_SYMBOL(kstat);
+EXPORT_PER_CPU_SYMBOL(kernel_cpustat);
/*
* Return any ns on the sched_clock that have not yet been accounted in
return ns;
}
+#ifdef CONFIG_CGROUP_CPUACCT
+struct cgroup_subsys cpuacct_subsys;
+struct cpuacct root_cpuacct;
+#endif
+
+static inline void task_group_account_field(struct task_struct *p, int index,
+ u64 tmp)
+{
+#ifdef CONFIG_CGROUP_CPUACCT
+ struct kernel_cpustat *kcpustat;
+ struct cpuacct *ca;
+#endif
+ /*
+ * Since all updates are sure to touch the root cgroup, we
+ * get ourselves ahead and touch it first. If the root cgroup
+ * is the only cgroup, then nothing else should be necessary.
+ *
+ */
+ __get_cpu_var(kernel_cpustat).cpustat[index] += tmp;
+
+#ifdef CONFIG_CGROUP_CPUACCT
+ if (unlikely(!cpuacct_subsys.active))
+ return;
+
+ rcu_read_lock();
+ ca = task_ca(p);
+ while (ca && (ca != &root_cpuacct)) {
+ kcpustat = this_cpu_ptr(ca->cpustat);
+ kcpustat->cpustat[index] += tmp;
+ ca = parent_ca(ca);
+ }
+ rcu_read_unlock();
+#endif
+}
+
+
/*
* Account user cpu time to a process.
* @p: the process that the cpu time gets accounted to
void account_user_time(struct task_struct *p, cputime_t cputime,
cputime_t cputime_scaled)
{
- struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;
- cputime64_t tmp;
+ int index;
/* Add user time to process. */
- p->utime = cputime_add(p->utime, cputime);
- p->utimescaled = cputime_add(p->utimescaled, cputime_scaled);
+ p->utime += cputime;
+ p->utimescaled += cputime_scaled;
account_group_user_time(p, cputime);
+ index = (TASK_NICE(p) > 0) ? CPUTIME_NICE : CPUTIME_USER;
+
/* Add user time to cpustat. */
- tmp = cputime_to_cputime64(cputime);
- if (TASK_NICE(p) > 0)
- cpustat->nice = cputime64_add(cpustat->nice, tmp);
- else
- cpustat->user = cputime64_add(cpustat->user, tmp);
+ task_group_account_field(p, index, (__force u64) cputime);
- cpuacct_update_stats(p, CPUACCT_STAT_USER, cputime);
/* Account for user time used */
acct_update_integrals(p);
}
static void account_guest_time(struct task_struct *p, cputime_t cputime,
cputime_t cputime_scaled)
{
- cputime64_t tmp;
- struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;
-
- tmp = cputime_to_cputime64(cputime);
+ u64 *cpustat = kcpustat_this_cpu->cpustat;
/* Add guest time to process. */
- p->utime = cputime_add(p->utime, cputime);
- p->utimescaled = cputime_add(p->utimescaled, cputime_scaled);
+ p->utime += cputime;
+ p->utimescaled += cputime_scaled;
account_group_user_time(p, cputime);
- p->gtime = cputime_add(p->gtime, cputime);
+ p->gtime += cputime;
/* Add guest time to cpustat. */
if (TASK_NICE(p) > 0) {
- cpustat->nice = cputime64_add(cpustat->nice, tmp);
- cpustat->guest_nice = cputime64_add(cpustat->guest_nice, tmp);
+ cpustat[CPUTIME_NICE] += (__force u64) cputime;
+ cpustat[CPUTIME_GUEST_NICE] += (__force u64) cputime;
} else {
- cpustat->user = cputime64_add(cpustat->user, tmp);
- cpustat->guest = cputime64_add(cpustat->guest, tmp);
+ cpustat[CPUTIME_USER] += (__force u64) cputime;
+ cpustat[CPUTIME_GUEST] += (__force u64) cputime;
}
}
*/
static inline
void __account_system_time(struct task_struct *p, cputime_t cputime,
- cputime_t cputime_scaled, cputime64_t *target_cputime64)
+ cputime_t cputime_scaled, int index)
{
- cputime64_t tmp = cputime_to_cputime64(cputime);
-
/* Add system time to process. */
- p->stime = cputime_add(p->stime, cputime);
- p->stimescaled = cputime_add(p->stimescaled, cputime_scaled);
+ p->stime += cputime;
+ p->stimescaled += cputime_scaled;
account_group_system_time(p, cputime);
/* Add system time to cpustat. */
- *target_cputime64 = cputime64_add(*target_cputime64, tmp);
- cpuacct_update_stats(p, CPUACCT_STAT_SYSTEM, cputime);
+ task_group_account_field(p, index, (__force u64) cputime);
/* Account for system time used */
acct_update_integrals(p);
void account_system_time(struct task_struct *p, int hardirq_offset,
cputime_t cputime, cputime_t cputime_scaled)
{
- struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;
- cputime64_t *target_cputime64;
+ int index;
if ((p->flags & PF_VCPU) && (irq_count() - hardirq_offset == 0)) {
account_guest_time(p, cputime, cputime_scaled);
}
if (hardirq_count() - hardirq_offset)
- target_cputime64 = &cpustat->irq;
+ index = CPUTIME_IRQ;
else if (in_serving_softirq())
- target_cputime64 = &cpustat->softirq;
+ index = CPUTIME_SOFTIRQ;
else
- target_cputime64 = &cpustat->system;
+ index = CPUTIME_SYSTEM;
- __account_system_time(p, cputime, cputime_scaled, target_cputime64);
+ __account_system_time(p, cputime, cputime_scaled, index);
}
/*
*/
void account_steal_time(cputime_t cputime)
{
- struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;
- cputime64_t cputime64 = cputime_to_cputime64(cputime);
+ u64 *cpustat = kcpustat_this_cpu->cpustat;
- cpustat->steal = cputime64_add(cpustat->steal, cputime64);
+ cpustat[CPUTIME_STEAL] += (__force u64) cputime;
}
/*
*/
void account_idle_time(cputime_t cputime)
{
- struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;
- cputime64_t cputime64 = cputime_to_cputime64(cputime);
+ u64 *cpustat = kcpustat_this_cpu->cpustat;
struct rq *rq = this_rq();
if (atomic_read(&rq->nr_iowait) > 0)
- cpustat->iowait = cputime64_add(cpustat->iowait, cputime64);
+ cpustat[CPUTIME_IOWAIT] += (__force u64) cputime;
else
- cpustat->idle = cputime64_add(cpustat->idle, cputime64);
+ cpustat[CPUTIME_IDLE] += (__force u64) cputime;
}
static __always_inline bool steal_account_process_tick(void)
struct rq *rq)
{
cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
- cputime64_t tmp = cputime_to_cputime64(cputime_one_jiffy);
- struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;
+ u64 *cpustat = kcpustat_this_cpu->cpustat;
if (steal_account_process_tick())
return;
if (irqtime_account_hi_update()) {
- cpustat->irq = cputime64_add(cpustat->irq, tmp);
+ cpustat[CPUTIME_IRQ] += (__force u64) cputime_one_jiffy;
} else if (irqtime_account_si_update()) {
- cpustat->softirq = cputime64_add(cpustat->softirq, tmp);
+ cpustat[CPUTIME_SOFTIRQ] += (__force u64) cputime_one_jiffy;
} else if (this_cpu_ksoftirqd() == p) {
/*
* ksoftirqd time do not get accounted in cpu_softirq_time.
* Also, p->stime needs to be updated for ksoftirqd.
*/
__account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
- &cpustat->softirq);
+ CPUTIME_SOFTIRQ);
} else if (user_tick) {
account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
} else if (p == rq->idle) {
account_guest_time(p, cputime_one_jiffy, one_jiffy_scaled);
} else {
__account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
- &cpustat->system);
+ CPUTIME_SYSTEM);
}
}
void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
{
- cputime_t rtime, utime = p->utime, total = cputime_add(utime, p->stime);
+ cputime_t rtime, utime = p->utime, total = utime + p->stime;
/*
* Use CFS's precise accounting:
rtime = nsecs_to_cputime(p->se.sum_exec_runtime);
if (total) {
- u64 temp = rtime;
+ u64 temp = (__force u64) rtime;
- temp *= utime;
- do_div(temp, total);
- utime = (cputime_t)temp;
+ temp *= (__force u64) utime;
+ do_div(temp, (__force u32) total);
+ utime = (__force cputime_t) temp;
} else
utime = rtime;
* Compare with previous values, to keep monotonicity:
*/
p->prev_utime = max(p->prev_utime, utime);
- p->prev_stime = max(p->prev_stime, cputime_sub(rtime, p->prev_utime));
+ p->prev_stime = max(p->prev_stime, rtime - p->prev_utime);
*ut = p->prev_utime;
*st = p->prev_stime;
thread_group_cputime(p, &cputime);
- total = cputime_add(cputime.utime, cputime.stime);
+ total = cputime.utime + cputime.stime;
rtime = nsecs_to_cputime(cputime.sum_exec_runtime);
if (total) {
- u64 temp = rtime;
+ u64 temp = (__force u64) rtime;
- temp *= cputime.utime;
- do_div(temp, total);
- utime = (cputime_t)temp;
+ temp *= (__force u64) cputime.utime;
+ do_div(temp, (__force u32) total);
+ utime = (__force cputime_t) temp;
} else
utime = rtime;
sig->prev_utime = max(sig->prev_utime, utime);
- sig->prev_stime = max(sig->prev_stime,
- cputime_sub(rtime, sig->prev_utime));
+ sig->prev_stime = max(sig->prev_stime, rtime - sig->prev_utime);
*ut = sig->prev_utime;
*st = sig->prev_stime;
{
struct pt_regs *regs = get_irq_regs();
+ if (oops_in_progress)
+ return;
+
printk(KERN_ERR "BUG: scheduling while atomic: %s/%d/0x%08x\n",
prev->comm, prev->pid, preempt_count());
*/
if (preempt && rq != p_rq)
resched_task(p_rq->curr);
+ } else {
+ /*
+ * We might have set it in task_yield_fair(), but are
+ * not going to schedule(), so don't want to skip
+ * the next update.
+ */
+ rq->skip_clock_update = 0;
}
out:
free = stack_not_used(p);
#endif
printk(KERN_CONT "%5lu %5d %6d 0x%08lx\n", free,
- task_pid_nr(p), task_pid_nr(p->real_parent),
+ task_pid_nr(p), task_pid_nr(rcu_dereference(p->real_parent)),
(unsigned long)task_thread_info(p)->flags);
show_stack(p, NULL);
#endif
}
-/*
- * Increase the granularity value when there are more CPUs,
- * because with more CPUs the 'effective latency' as visible
- * to users decreases. But the relationship is not linear,
- * so pick a second-best guess by going with the log2 of the
- * number of CPUs.
- *
- * This idea comes from the SD scheduler of Con Kolivas:
- */
-static int get_update_sysctl_factor(void)
-{
- unsigned int cpus = min_t(int, num_online_cpus(), 8);
- unsigned int factor;
-
- switch (sysctl_sched_tunable_scaling) {
- case SCHED_TUNABLESCALING_NONE:
- factor = 1;
- break;
- case SCHED_TUNABLESCALING_LINEAR:
- factor = cpus;
- break;
- case SCHED_TUNABLESCALING_LOG:
- default:
- factor = 1 + ilog2(cpus);
- break;
- }
-
- return factor;
-}
-
-static void update_sysctl(void)
-{
- unsigned int factor = get_update_sysctl_factor();
-
-#define SET_SYSCTL(name) \
- (sysctl_##name = (factor) * normalized_sysctl_##name)
- SET_SYSCTL(sched_min_granularity);
- SET_SYSCTL(sched_latency);
- SET_SYSCTL(sched_wakeup_granularity);
-#undef SET_SYSCTL
-}
-
-static inline void sched_init_granularity(void)
-{
- update_sysctl();
-}
-
#ifdef CONFIG_SMP
void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
{
rq_src->nr_uninterruptible = 0;
}
-/*
- * remove the tasks which were accounted by rq from calc_load_tasks.
- */
-static void calc_global_load_remove(struct rq *rq)
-{
- atomic_long_sub(rq->calc_load_active, &calc_load_tasks);
- rq->calc_load_active = 0;
-}
-
-#ifdef CONFIG_CFS_BANDWIDTH
-static void unthrottle_offline_cfs_rqs(struct rq *rq)
-{
- struct cfs_rq *cfs_rq;
-
- for_each_leaf_cfs_rq(rq, cfs_rq) {
- struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
-
- if (!cfs_rq->runtime_enabled)
- continue;
-
- /*
- * clock_task is not advancing so we just need to make sure
- * there's some valid quota amount
- */
- cfs_rq->runtime_remaining = cfs_b->quota;
- if (cfs_rq_throttled(cfs_rq))
- unthrottle_cfs_rq(cfs_rq);
- }
+/*
+ * remove the tasks which were accounted by rq from calc_load_tasks.
+ */
+static void calc_global_load_remove(struct rq *rq)
+{
+ atomic_long_sub(rq->calc_load_active, &calc_load_tasks);
+ rq->calc_load_active = 0;
}
-#else
-static void unthrottle_offline_cfs_rqs(struct rq *rq) {}
-#endif
/*
* Migrate all tasks from the rq, sleeping tasks will be migrated by
return -ENOMEM;
}
+/*
+ * By default the system creates a single root-domain with all cpus as
+ * members (mimicking the global state we have today).
+ */
+struct root_domain def_root_domain;
+
static void init_defrootdomain(void)
{
init_rootdomain(&def_root_domain);
}
/*
+ * Keep a special pointer to the highest sched_domain that has
+ * SD_SHARE_PKG_RESOURCE set (Last Level Cache Domain) for this
+ * allows us to avoid some pointer chasing select_idle_sibling().
+ *
+ * Also keep a unique ID per domain (we use the first cpu number in
+ * the cpumask of the domain), this allows us to quickly tell if
+ * two cpus are in the same cache domain, see ttwu_share_cache().
+ */
+DEFINE_PER_CPU(struct sched_domain *, sd_llc);
+DEFINE_PER_CPU(int, sd_llc_id);
+
+static void update_top_cache_domain(int cpu)
+{
+ struct sched_domain *sd;
+ int id = cpu;
+
+ sd = highest_flag_domain(cpu, SD_SHARE_PKG_RESOURCES);
+ if (sd)
+ id = cpumask_first(sched_domain_span(sd));
+
+ rcu_assign_pointer(per_cpu(sd_llc, cpu), sd);
+ per_cpu(sd_llc_id, cpu) = id;
+}
+
+/*
* Attach the domain 'sd' to 'cpu' as its base domain. Callers must
* hold the hotplug lock.
*/
tmp = rq->sd;
rcu_assign_pointer(rq->sd, sd);
destroy_sched_domains(tmp, cpu);
+
+ update_top_cache_domain(cpu);
}
/* cpus with isolated domains */
continue;
sg = kzalloc_node(sizeof(struct sched_group) + cpumask_size(),
- GFP_KERNEL, cpu_to_node(i));
+ GFP_KERNEL, cpu_to_node(cpu));
if (!sg)
goto fail;
return;
update_group_power(sd, cpu);
+ atomic_set(&sg->sgp->nr_busy_cpus, sg->group_weight);
+}
+
+int __weak arch_sd_sibling_asym_packing(void)
+{
+ return 0*SD_ASYM_PACKING;
}
/*
}
}
-static int update_runtime(struct notifier_block *nfb,
- unsigned long action, void *hcpu)
-{
- int cpu = (int)(long)hcpu;
-
- switch (action) {
- case CPU_DOWN_PREPARE:
- case CPU_DOWN_PREPARE_FROZEN:
- disable_runtime(cpu_rq(cpu));
- return NOTIFY_OK;
-
- case CPU_DOWN_FAILED:
- case CPU_DOWN_FAILED_FROZEN:
- case CPU_ONLINE:
- case CPU_ONLINE_FROZEN:
- enable_runtime(cpu_rq(cpu));
- return NOTIFY_OK;
-
- default:
- return NOTIFY_DONE;
- }
-}
-
void __init sched_init_smp(void)
{
cpumask_var_t non_isolated_cpus;
&& addr < (unsigned long)__sched_text_end);
}
-static void init_cfs_rq(struct cfs_rq *cfs_rq)
-{
- cfs_rq->tasks_timeline = RB_ROOT;
- INIT_LIST_HEAD(&cfs_rq->tasks);
- cfs_rq->min_vruntime = (u64)(-(1LL << 20));
-#ifndef CONFIG_64BIT
- cfs_rq->min_vruntime_copy = cfs_rq->min_vruntime;
-#endif
-}
-
-static void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
-{
- struct rt_prio_array *array;
- int i;
-
- array = &rt_rq->active;
- for (i = 0; i < MAX_RT_PRIO; i++) {
- INIT_LIST_HEAD(array->queue + i);
- __clear_bit(i, array->bitmap);
- }
- /* delimiter for bitsearch: */
- __set_bit(MAX_RT_PRIO, array->bitmap);
-
-#if defined CONFIG_SMP
- rt_rq->highest_prio.curr = MAX_RT_PRIO;
- rt_rq->highest_prio.next = MAX_RT_PRIO;
- rt_rq->rt_nr_migratory = 0;
- rt_rq->overloaded = 0;
- plist_head_init(&rt_rq->pushable_tasks);
-#endif
-
- rt_rq->rt_time = 0;
- rt_rq->rt_throttled = 0;
- rt_rq->rt_runtime = 0;
- raw_spin_lock_init(&rt_rq->rt_runtime_lock);
-}
-
-#ifdef CONFIG_FAIR_GROUP_SCHED
-static void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
- struct sched_entity *se, int cpu,
- struct sched_entity *parent)
-{
- struct rq *rq = cpu_rq(cpu);
-
- cfs_rq->tg = tg;
- cfs_rq->rq = rq;
-#ifdef CONFIG_SMP
- /* allow initial update_cfs_load() to truncate */
- cfs_rq->load_stamp = 1;
-#endif
- init_cfs_rq_runtime(cfs_rq);
-
- tg->cfs_rq[cpu] = cfs_rq;
- tg->se[cpu] = se;
-
- /* se could be NULL for root_task_group */
- if (!se)
- return;
-
- if (!parent)
- se->cfs_rq = &rq->cfs;
- else
- se->cfs_rq = parent->my_q;
-
- se->my_q = cfs_rq;
- update_load_set(&se->load, 0);
- se->parent = parent;
-}
+#ifdef CONFIG_CGROUP_SCHED
+struct task_group root_task_group;
#endif
-#ifdef CONFIG_RT_GROUP_SCHED
-static void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
- struct sched_rt_entity *rt_se, int cpu,
- struct sched_rt_entity *parent)
-{
- struct rq *rq = cpu_rq(cpu);
-
- rt_rq->highest_prio.curr = MAX_RT_PRIO;
- rt_rq->rt_nr_boosted = 0;
- rt_rq->rq = rq;
- rt_rq->tg = tg;
-
- tg->rt_rq[cpu] = rt_rq;
- tg->rt_se[cpu] = rt_se;
-
- if (!rt_se)
- return;
-
- if (!parent)
- rt_se->rt_rq = &rq->rt;
- else
- rt_se->rt_rq = parent->my_q;
-
- rt_se->my_q = rt_rq;
- rt_se->parent = parent;
- INIT_LIST_HEAD(&rt_se->run_list);
-}
-#endif
+DECLARE_PER_CPU(cpumask_var_t, load_balance_tmpmask);
void __init sched_init(void)
{
#ifdef CONFIG_CGROUP_SCHED
list_add(&root_task_group.list, &task_groups);
INIT_LIST_HEAD(&root_task_group.children);
+ INIT_LIST_HEAD(&root_task_group.siblings);
autogroup_init(&init_task);
+
#endif /* CONFIG_CGROUP_SCHED */
+#ifdef CONFIG_CGROUP_CPUACCT
+ root_cpuacct.cpustat = &kernel_cpustat;
+ root_cpuacct.cpuusage = alloc_percpu(u64);
+ /* Too early, not expected to fail */
+ BUG_ON(!root_cpuacct.cpuusage);
+#endif
for_each_possible_cpu(i) {
struct rq *rq;
init_cfs_rq(&rq->cfs);
init_rt_rq(&rq->rt, rq);
#ifdef CONFIG_FAIR_GROUP_SCHED
- root_task_group.shares = root_task_group_load;
+ root_task_group.shares = ROOT_TASK_GROUP_LOAD;
INIT_LIST_HEAD(&rq->leaf_cfs_rq_list);
/*
* How much cpu bandwidth does root_task_group get?
rq->avg_idle = 2*sysctl_sched_migration_cost;
rq_attach_root(rq, &def_root_domain);
#ifdef CONFIG_NO_HZ
- rq->nohz_balance_kick = 0;
+ rq->nohz_flags = 0;
#endif
#endif
init_rq_hrtick(rq);
INIT_HLIST_HEAD(&init_task.preempt_notifiers);
#endif
-#ifdef CONFIG_SMP
- open_softirq(SCHED_SOFTIRQ, run_rebalance_domains);
-#endif
-
#ifdef CONFIG_RT_MUTEXES
plist_head_init(&init_task.pi_waiters);
#endif
#ifdef CONFIG_SMP
zalloc_cpumask_var(&sched_domains_tmpmask, GFP_NOWAIT);
-#ifdef CONFIG_NO_HZ
- zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
- alloc_cpumask_var(&nohz.grp_idle_mask, GFP_NOWAIT);
- atomic_set(&nohz.load_balancer, nr_cpu_ids);
- atomic_set(&nohz.first_pick_cpu, nr_cpu_ids);
- atomic_set(&nohz.second_pick_cpu, nr_cpu_ids);
-#endif
/* May be allocated at isolcpus cmdline parse time */
if (cpu_isolated_map == NULL)
zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
-#endif /* SMP */
+#endif
+ init_sched_fair_class();
scheduler_running = 1;
}
#endif
-#ifdef CONFIG_FAIR_GROUP_SCHED
-static void free_fair_sched_group(struct task_group *tg)
-{
- int i;
-
- destroy_cfs_bandwidth(tg_cfs_bandwidth(tg));
-
- for_each_possible_cpu(i) {
- if (tg->cfs_rq)
- kfree(tg->cfs_rq[i]);
- if (tg->se)
- kfree(tg->se[i]);
- }
-
- kfree(tg->cfs_rq);
- kfree(tg->se);
-}
-
-static
-int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
-{
- struct cfs_rq *cfs_rq;
- struct sched_entity *se;
- int i;
-
- tg->cfs_rq = kzalloc(sizeof(cfs_rq) * nr_cpu_ids, GFP_KERNEL);
- if (!tg->cfs_rq)
- goto err;
- tg->se = kzalloc(sizeof(se) * nr_cpu_ids, GFP_KERNEL);
- if (!tg->se)
- goto err;
-
- tg->shares = NICE_0_LOAD;
-
- init_cfs_bandwidth(tg_cfs_bandwidth(tg));
-
- for_each_possible_cpu(i) {
- cfs_rq = kzalloc_node(sizeof(struct cfs_rq),
- GFP_KERNEL, cpu_to_node(i));
- if (!cfs_rq)
- goto err;
-
- se = kzalloc_node(sizeof(struct sched_entity),
- GFP_KERNEL, cpu_to_node(i));
- if (!se)
- goto err_free_rq;
-
- init_cfs_rq(cfs_rq);
- init_tg_cfs_entry(tg, cfs_rq, se, i, parent->se[i]);
- }
-
- return 1;
-
-err_free_rq:
- kfree(cfs_rq);
-err:
- return 0;
-}
-
-static inline void unregister_fair_sched_group(struct task_group *tg, int cpu)
-{
- struct rq *rq = cpu_rq(cpu);
- unsigned long flags;
-
- /*
- * Only empty task groups can be destroyed; so we can speculatively
- * check on_list without danger of it being re-added.
- */
- if (!tg->cfs_rq[cpu]->on_list)
- return;
-
- raw_spin_lock_irqsave(&rq->lock, flags);
- list_del_leaf_cfs_rq(tg->cfs_rq[cpu]);
- raw_spin_unlock_irqrestore(&rq->lock, flags);
-}
-#else /* !CONFIG_FAIR_GROUP_SCHED */
-static inline void free_fair_sched_group(struct task_group *tg)
-{
-}
-
-static inline
-int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
-{
- return 1;
-}
-
-static inline void unregister_fair_sched_group(struct task_group *tg, int cpu)
-{
-}
-#endif /* CONFIG_FAIR_GROUP_SCHED */
-
#ifdef CONFIG_RT_GROUP_SCHED
-static void free_rt_sched_group(struct task_group *tg)
-{
- int i;
-
- if (tg->rt_se)
- destroy_rt_bandwidth(&tg->rt_bandwidth);
-
- for_each_possible_cpu(i) {
- if (tg->rt_rq)
- kfree(tg->rt_rq[i]);
- if (tg->rt_se)
- kfree(tg->rt_se[i]);
- }
-
- kfree(tg->rt_rq);
- kfree(tg->rt_se);
-}
-
-static
-int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
-{
- struct rt_rq *rt_rq;
- struct sched_rt_entity *rt_se;
- int i;
-
- tg->rt_rq = kzalloc(sizeof(rt_rq) * nr_cpu_ids, GFP_KERNEL);
- if (!tg->rt_rq)
- goto err;
- tg->rt_se = kzalloc(sizeof(rt_se) * nr_cpu_ids, GFP_KERNEL);
- if (!tg->rt_se)
- goto err;
-
- init_rt_bandwidth(&tg->rt_bandwidth,
- ktime_to_ns(def_rt_bandwidth.rt_period), 0);
-
- for_each_possible_cpu(i) {
- rt_rq = kzalloc_node(sizeof(struct rt_rq),
- GFP_KERNEL, cpu_to_node(i));
- if (!rt_rq)
- goto err;
-
- rt_se = kzalloc_node(sizeof(struct sched_rt_entity),
- GFP_KERNEL, cpu_to_node(i));
- if (!rt_se)
- goto err_free_rq;
-
- init_rt_rq(rt_rq, cpu_rq(i));
- rt_rq->rt_runtime = tg->rt_bandwidth.rt_runtime;
- init_tg_rt_entry(tg, rt_rq, rt_se, i, parent->rt_se[i]);
- }
-
- return 1;
-
-err_free_rq:
- kfree(rt_rq);
-err:
- return 0;
-}
#else /* !CONFIG_RT_GROUP_SCHED */
-static inline void free_rt_sched_group(struct task_group *tg)
-{
-}
-
-static inline
-int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
-{
- return 1;
-}
#endif /* CONFIG_RT_GROUP_SCHED */
#ifdef CONFIG_CGROUP_SCHED
+/* task_group_lock serializes the addition/removal of task groups */
+static DEFINE_SPINLOCK(task_group_lock);
+
static void free_sched_group(struct task_group *tg)
{
free_fair_sched_group(tg);
#endif /* CONFIG_CGROUP_SCHED */
#ifdef CONFIG_FAIR_GROUP_SCHED
-static DEFINE_MUTEX(shares_mutex);
-
-int sched_group_set_shares(struct task_group *tg, unsigned long shares)
-{
- int i;
- unsigned long flags;
-
- /*
- * We can't change the weight of the root cgroup.
- */
- if (!tg->se[0])
- return -EINVAL;
-
- shares = clamp(shares, scale_load(MIN_SHARES), scale_load(MAX_SHARES));
-
- mutex_lock(&shares_mutex);
- if (tg->shares == shares)
- goto done;
-
- tg->shares = shares;
- for_each_possible_cpu(i) {
- struct rq *rq = cpu_rq(i);
- struct sched_entity *se;
-
- se = tg->se[i];
- /* Propagate contribution to hierarchy */
- raw_spin_lock_irqsave(&rq->lock, flags);
- for_each_sched_entity(se)
- update_cfs_shares(group_cfs_rq(se));
- raw_spin_unlock_irqrestore(&rq->lock, flags);
- }
-
-done:
- mutex_unlock(&shares_mutex);
- return 0;
-}
-
-unsigned long sched_group_shares(struct task_group *tg)
-{
- return tg->shares;
-}
#endif
#if defined(CONFIG_RT_GROUP_SCHED) || defined(CONFIG_CFS_BANDWIDTH)
struct task_struct *g, *p;
do_each_thread(g, p) {
- if (rt_task(p) && rt_rq_of_se(&p->rt)->tg == tg)
+ if (rt_task(p) && task_rq(p)->rt.tg == tg)
return 1;
} while_each_thread(g, p);
static int tg_set_cfs_bandwidth(struct task_group *tg, u64 period, u64 quota)
{
- int i, ret = 0, runtime_enabled;
- struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(tg);
+ int i, ret = 0, runtime_enabled, runtime_was_enabled;
+ struct cfs_bandwidth *cfs_b = &tg->cfs_bandwidth;
if (tg == &root_task_group)
return -EINVAL;
goto out_unlock;
runtime_enabled = quota != RUNTIME_INF;
+ runtime_was_enabled = cfs_b->quota != RUNTIME_INF;
+ account_cfs_bandwidth_used(runtime_enabled, runtime_was_enabled);
raw_spin_lock_irq(&cfs_b->lock);
cfs_b->period = ns_to_ktime(period);
cfs_b->quota = quota;
for_each_possible_cpu(i) {
struct cfs_rq *cfs_rq = tg->cfs_rq[i];
- struct rq *rq = rq_of(cfs_rq);
+ struct rq *rq = cfs_rq->rq;
raw_spin_lock_irq(&rq->lock);
cfs_rq->runtime_enabled = runtime_enabled;
cfs_rq->runtime_remaining = 0;
- if (cfs_rq_throttled(cfs_rq))
+ if (cfs_rq->throttled)
unthrottle_cfs_rq(cfs_rq);
raw_spin_unlock_irq(&rq->lock);
}
{
u64 quota, period;
- period = ktime_to_ns(tg_cfs_bandwidth(tg)->period);
+ period = ktime_to_ns(tg->cfs_bandwidth.period);
if (cfs_quota_us < 0)
quota = RUNTIME_INF;
else
{
u64 quota_us;
- if (tg_cfs_bandwidth(tg)->quota == RUNTIME_INF)
+ if (tg->cfs_bandwidth.quota == RUNTIME_INF)
return -1;
- quota_us = tg_cfs_bandwidth(tg)->quota;
+ quota_us = tg->cfs_bandwidth.quota;
do_div(quota_us, NSEC_PER_USEC);
return quota_us;
u64 quota, period;
period = (u64)cfs_period_us * NSEC_PER_USEC;
- quota = tg_cfs_bandwidth(tg)->quota;
-
- if (period <= 0)
- return -EINVAL;
+ quota = tg->cfs_bandwidth.quota;
return tg_set_cfs_bandwidth(tg, period, quota);
}
{
u64 cfs_period_us;
- cfs_period_us = ktime_to_ns(tg_cfs_bandwidth(tg)->period);
+ cfs_period_us = ktime_to_ns(tg->cfs_bandwidth.period);
do_div(cfs_period_us, NSEC_PER_USEC);
return cfs_period_us;
static int tg_cfs_schedulable_down(struct task_group *tg, void *data)
{
struct cfs_schedulable_data *d = data;
- struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(tg);
+ struct cfs_bandwidth *cfs_b = &tg->cfs_bandwidth;
s64 quota = 0, parent_quota = -1;
if (!tg->parent) {
quota = RUNTIME_INF;
} else {
- struct cfs_bandwidth *parent_b = tg_cfs_bandwidth(tg->parent);
+ struct cfs_bandwidth *parent_b = &tg->parent->cfs_bandwidth;
quota = normalize_cfs_quota(tg, d);
parent_quota = parent_b->hierarchal_quota;
struct cgroup_map_cb *cb)
{
struct task_group *tg = cgroup_tg(cgrp);
- struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(tg);
+ struct cfs_bandwidth *cfs_b = &tg->cfs_bandwidth;
cb->fill(cb, "nr_periods", cfs_b->nr_periods);
cb->fill(cb, "nr_throttled", cfs_b->nr_throttled);
* (balbir@in.ibm.com).
*/
-/* track cpu usage of a group of tasks and its child groups */
-struct cpuacct {
- struct cgroup_subsys_state css;
- /* cpuusage holds pointer to a u64-type object on every cpu */
- u64 __percpu *cpuusage;
- struct percpu_counter cpustat[CPUACCT_STAT_NSTATS];
- struct cpuacct *parent;
-};
-
-struct cgroup_subsys cpuacct_subsys;
-
-/* return cpu accounting group corresponding to this container */
-static inline struct cpuacct *cgroup_ca(struct cgroup *cgrp)
-{
- return container_of(cgroup_subsys_state(cgrp, cpuacct_subsys_id),
- struct cpuacct, css);
-}
-
-/* return cpu accounting group to which this task belongs */
-static inline struct cpuacct *task_ca(struct task_struct *tsk)
-{
- return container_of(task_subsys_state(tsk, cpuacct_subsys_id),
- struct cpuacct, css);
-}
-
/* create a new cpu accounting group */
static struct cgroup_subsys_state *cpuacct_create(
struct cgroup_subsys *ss, struct cgroup *cgrp)
{
- struct cpuacct *ca = kzalloc(sizeof(*ca), GFP_KERNEL);
- int i;
+ struct cpuacct *ca;
+ if (!cgrp->parent)
+ return &root_cpuacct.css;
+
+ ca = kzalloc(sizeof(*ca), GFP_KERNEL);
if (!ca)
goto out;
if (!ca->cpuusage)
goto out_free_ca;
- for (i = 0; i < CPUACCT_STAT_NSTATS; i++)
- if (percpu_counter_init(&ca->cpustat[i], 0))
- goto out_free_counters;
-
- if (cgrp->parent)
- ca->parent = cgroup_ca(cgrp->parent);
+ ca->cpustat = alloc_percpu(struct kernel_cpustat);
+ if (!ca->cpustat)
+ goto out_free_cpuusage;
return &ca->css;
-out_free_counters:
- while (--i >= 0)
- percpu_counter_destroy(&ca->cpustat[i]);
+out_free_cpuusage:
free_percpu(ca->cpuusage);
out_free_ca:
kfree(ca);
cpuacct_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
{
struct cpuacct *ca = cgroup_ca(cgrp);
- int i;
- for (i = 0; i < CPUACCT_STAT_NSTATS; i++)
- percpu_counter_destroy(&ca->cpustat[i]);
+ free_percpu(ca->cpustat);
free_percpu(ca->cpuusage);
kfree(ca);
}
};
static int cpuacct_stats_show(struct cgroup *cgrp, struct cftype *cft,
- struct cgroup_map_cb *cb)
+ struct cgroup_map_cb *cb)
{
struct cpuacct *ca = cgroup_ca(cgrp);
- int i;
+ int cpu;
+ s64 val = 0;
+
+ for_each_online_cpu(cpu) {
+ struct kernel_cpustat *kcpustat = per_cpu_ptr(ca->cpustat, cpu);
+ val += kcpustat->cpustat[CPUTIME_USER];
+ val += kcpustat->cpustat[CPUTIME_NICE];
+ }
+ val = cputime64_to_clock_t(val);
+ cb->fill(cb, cpuacct_stat_desc[CPUACCT_STAT_USER], val);
- for (i = 0; i < CPUACCT_STAT_NSTATS; i++) {
- s64 val = percpu_counter_read(&ca->cpustat[i]);
- val = cputime64_to_clock_t(val);
- cb->fill(cb, cpuacct_stat_desc[i], val);
+ val = 0;
+ for_each_online_cpu(cpu) {
+ struct kernel_cpustat *kcpustat = per_cpu_ptr(ca->cpustat, cpu);
+ val += kcpustat->cpustat[CPUTIME_SYSTEM];
+ val += kcpustat->cpustat[CPUTIME_IRQ];
+ val += kcpustat->cpustat[CPUTIME_SOFTIRQ];
}
+
+ val = cputime64_to_clock_t(val);
+ cb->fill(cb, cpuacct_stat_desc[CPUACCT_STAT_SYSTEM], val);
+
return 0;
}
*
* called with rq->lock held.
*/
-static void cpuacct_charge(struct task_struct *tsk, u64 cputime)
+void cpuacct_charge(struct task_struct *tsk, u64 cputime)
{
struct cpuacct *ca;
int cpu;
ca = task_ca(tsk);
- for (; ca; ca = ca->parent) {
+ for (; ca; ca = parent_ca(ca)) {
u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
*cpuusage += cputime;
}
rcu_read_unlock();
}
-/*
- * When CONFIG_VIRT_CPU_ACCOUNTING is enabled one jiffy can be very large
- * in cputime_t units. As a result, cpuacct_update_stats calls
- * percpu_counter_add with values large enough to always overflow the
- * per cpu batch limit causing bad SMP scalability.
- *
- * To fix this we scale percpu_counter_batch by cputime_one_jiffy so we
- * batch the same amount of time with CONFIG_VIRT_CPU_ACCOUNTING disabled
- * and enabled. We cap it at INT_MAX which is the largest allowed batch value.
- */
-#ifdef CONFIG_SMP
-#define CPUACCT_BATCH \
- min_t(long, percpu_counter_batch * cputime_one_jiffy, INT_MAX)
-#else
-#define CPUACCT_BATCH 0
-#endif
-
-/*
- * Charge the system/user time to the task's accounting group.
- */
-static void cpuacct_update_stats(struct task_struct *tsk,
- enum cpuacct_stat_index idx, cputime_t val)
-{
- struct cpuacct *ca;
- int batch = CPUACCT_BATCH;
-
- if (unlikely(!cpuacct_subsys.active))
- return;
-
- rcu_read_lock();
- ca = task_ca(tsk);
-
- do {
- __percpu_counter_add(&ca->cpustat[idx], val, batch);
- ca = ca->parent;
- } while (ca);
- rcu_read_unlock();
-}
-
struct cgroup_subsys cpuacct_subsys = {
.name = "cpuacct",
.create = cpuacct_create,
/*
- * kernel/sched_cpupri.c
+ * kernel/sched/cpupri.c
*
* CPU priority management
*
*/
#include <linux/gfp.h>
-#include "sched_cpupri.h"
+#include "cpupri.h"
/* Convert between a 140 based task->prio, and our 102 based cpupri */
static int convert_prio(int prio)
/*
- * kernel/time/sched_debug.c
+ * kernel/sched/debug.c
*
* Print the CFS rbtree
*
#include <linux/kallsyms.h>
#include <linux/utsname.h>
+#include "sched.h"
+
static DEFINE_SPINLOCK(sched_debug_lock);
/*
return 0;
}
-static void sysrq_sched_debug_show(void)
+void sysrq_sched_debug_show(void)
{
sched_debug_show(NULL, NULL);
}
#include <linux/latencytop.h>
#include <linux/sched.h>
#include <linux/cpumask.h>
+#include <linux/slab.h>
+#include <linux/profile.h>
+#include <linux/interrupt.h>
+
+#include <trace/events/sched.h>
+
+#include "sched.h"
/*
* Targeted preemption latency for CPU-bound tasks:
unsigned int sysctl_sched_cfs_bandwidth_slice = 5000UL;
#endif
-static const struct sched_class fair_sched_class;
+/*
+ * Increase the granularity value when there are more CPUs,
+ * because with more CPUs the 'effective latency' as visible
+ * to users decreases. But the relationship is not linear,
+ * so pick a second-best guess by going with the log2 of the
+ * number of CPUs.
+ *
+ * This idea comes from the SD scheduler of Con Kolivas:
+ */
+static int get_update_sysctl_factor(void)
+{
+ unsigned int cpus = min_t(int, num_online_cpus(), 8);
+ unsigned int factor;
+
+ switch (sysctl_sched_tunable_scaling) {
+ case SCHED_TUNABLESCALING_NONE:
+ factor = 1;
+ break;
+ case SCHED_TUNABLESCALING_LINEAR:
+ factor = cpus;
+ break;
+ case SCHED_TUNABLESCALING_LOG:
+ default:
+ factor = 1 + ilog2(cpus);
+ break;
+ }
+
+ return factor;
+}
+
+static void update_sysctl(void)
+{
+ unsigned int factor = get_update_sysctl_factor();
+
+#define SET_SYSCTL(name) \
+ (sysctl_##name = (factor) * normalized_sysctl_##name)
+ SET_SYSCTL(sched_min_granularity);
+ SET_SYSCTL(sched_latency);
+ SET_SYSCTL(sched_wakeup_granularity);
+#undef SET_SYSCTL
+}
+
+void sched_init_granularity(void)
+{
+ update_sysctl();
+}
+
+#if BITS_PER_LONG == 32
+# define WMULT_CONST (~0UL)
+#else
+# define WMULT_CONST (1UL << 32)
+#endif
+
+#define WMULT_SHIFT 32
+
+/*
+ * Shift right and round:
+ */
+#define SRR(x, y) (((x) + (1UL << ((y) - 1))) >> (y))
+
+/*
+ * delta *= weight / lw
+ */
+static unsigned long
+calc_delta_mine(unsigned long delta_exec, unsigned long weight,
+ struct load_weight *lw)
+{
+ u64 tmp;
+
+ /*
+ * weight can be less than 2^SCHED_LOAD_RESOLUTION for task group sched
+ * entities since MIN_SHARES = 2. Treat weight as 1 if less than
+ * 2^SCHED_LOAD_RESOLUTION.
+ */
+ if (likely(weight > (1UL << SCHED_LOAD_RESOLUTION)))
+ tmp = (u64)delta_exec * scale_load_down(weight);
+ else
+ tmp = (u64)delta_exec;
+
+ if (!lw->inv_weight) {
+ unsigned long w = scale_load_down(lw->weight);
+
+ if (BITS_PER_LONG > 32 && unlikely(w >= WMULT_CONST))
+ lw->inv_weight = 1;
+ else if (unlikely(!w))
+ lw->inv_weight = WMULT_CONST;
+ else
+ lw->inv_weight = WMULT_CONST / w;
+ }
+
+ /*
+ * Check whether we'd overflow the 64-bit multiplication:
+ */
+ if (unlikely(tmp > WMULT_CONST))
+ tmp = SRR(SRR(tmp, WMULT_SHIFT/2) * lw->inv_weight,
+ WMULT_SHIFT/2);
+ else
+ tmp = SRR(tmp * lw->inv_weight, WMULT_SHIFT);
+
+ return (unsigned long)min(tmp, (u64)(unsigned long)LONG_MAX);
+}
+
+
+const struct sched_class fair_sched_class;
/**************************************************************
* CFS operations on generic schedulable entities:
rb_erase(&se->run_node, &cfs_rq->tasks_timeline);
}
-static struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq)
+struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq)
{
struct rb_node *left = cfs_rq->rb_leftmost;
}
#ifdef CONFIG_SCHED_DEBUG
-static struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq)
+struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq)
{
struct rb_node *last = rb_last(&cfs_rq->tasks_timeline);
{
update_load_add(&cfs_rq->load, se->load.weight);
if (!parent_entity(se))
- inc_cpu_load(rq_of(cfs_rq), se->load.weight);
+ update_load_add(&rq_of(cfs_rq)->load, se->load.weight);
if (entity_is_task(se)) {
add_cfs_task_weight(cfs_rq, se->load.weight);
list_add(&se->group_node, &cfs_rq->tasks);
{
update_load_sub(&cfs_rq->load, se->load.weight);
if (!parent_entity(se))
- dec_cpu_load(rq_of(cfs_rq), se->load.weight);
+ update_load_sub(&rq_of(cfs_rq)->load, se->load.weight);
if (entity_is_task(se)) {
add_cfs_task_weight(cfs_rq, -se->load.weight);
list_del_init(&se->group_node);
if (unlikely(delta > se->statistics.sleep_max))
se->statistics.sleep_max = delta;
- se->statistics.sleep_start = 0;
se->statistics.sum_sleep_runtime += delta;
if (tsk) {
if (unlikely(delta > se->statistics.block_max))
se->statistics.block_max = delta;
- se->statistics.block_start = 0;
se->statistics.sum_sleep_runtime += delta;
if (tsk) {
trace_sched_stat_iowait(tsk, delta);
}
+ trace_sched_stat_blocked(tsk, delta);
+
/*
* Blocking time is in units of nanosecs, so shift by
* 20 to get a milliseconds-range estimation of the
*/
#ifdef CONFIG_CFS_BANDWIDTH
+
+#ifdef HAVE_JUMP_LABEL
+static struct jump_label_key __cfs_bandwidth_used;
+
+static inline bool cfs_bandwidth_used(void)
+{
+ return static_branch(&__cfs_bandwidth_used);
+}
+
+void account_cfs_bandwidth_used(int enabled, int was_enabled)
+{
+ /* only need to count groups transitioning between enabled/!enabled */
+ if (enabled && !was_enabled)
+ jump_label_inc(&__cfs_bandwidth_used);
+ else if (!enabled && was_enabled)
+ jump_label_dec(&__cfs_bandwidth_used);
+}
+#else /* HAVE_JUMP_LABEL */
+static bool cfs_bandwidth_used(void)
+{
+ return true;
+}
+
+void account_cfs_bandwidth_used(int enabled, int was_enabled) {}
+#endif /* HAVE_JUMP_LABEL */
+
/*
* default period for cfs group bandwidth.
* default: 0.1s, units: nanoseconds
*
* requires cfs_b->lock
*/
-static void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b)
+void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b)
{
u64 now;
cfs_b->runtime_expires = now + ktime_to_ns(cfs_b->period);
}
+static inline struct cfs_bandwidth *tg_cfs_bandwidth(struct task_group *tg)
+{
+ return &tg->cfs_bandwidth;
+}
+
/* returns 0 on failure to allocate runtime */
static int assign_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
static __always_inline void account_cfs_rq_runtime(struct cfs_rq *cfs_rq,
unsigned long delta_exec)
{
- if (!cfs_rq->runtime_enabled)
+ if (!cfs_bandwidth_used() || !cfs_rq->runtime_enabled)
return;
__account_cfs_rq_runtime(cfs_rq, delta_exec);
static inline int cfs_rq_throttled(struct cfs_rq *cfs_rq)
{
- return cfs_rq->throttled;
+ return cfs_bandwidth_used() && cfs_rq->throttled;
}
/* check whether cfs_rq, or any parent, is throttled */
static inline int throttled_hierarchy(struct cfs_rq *cfs_rq)
{
- return cfs_rq->throttle_count;
+ return cfs_bandwidth_used() && cfs_rq->throttle_count;
}
/*
raw_spin_unlock(&cfs_b->lock);
}
-static void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
+void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
{
struct rq *rq = rq_of(cfs_rq);
struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
static __always_inline void return_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
+ if (!cfs_bandwidth_used())
+ return;
+
if (!cfs_rq->runtime_enabled || cfs_rq->nr_running)
return;
*/
static void check_enqueue_throttle(struct cfs_rq *cfs_rq)
{
+ if (!cfs_bandwidth_used())
+ return;
+
/* an active group must be handled by the update_curr()->put() path */
if (!cfs_rq->runtime_enabled || cfs_rq->curr)
return;
/* conditionally throttle active cfs_rq's from put_prev_entity() */
static void check_cfs_rq_runtime(struct cfs_rq *cfs_rq)
{
+ if (!cfs_bandwidth_used())
+ return;
+
if (likely(!cfs_rq->runtime_enabled || cfs_rq->runtime_remaining > 0))
return;
throttle_cfs_rq(cfs_rq);
}
-#else
+
+static inline u64 default_cfs_period(void);
+static int do_sched_cfs_period_timer(struct cfs_bandwidth *cfs_b, int overrun);
+static void do_sched_cfs_slack_timer(struct cfs_bandwidth *cfs_b);
+
+static enum hrtimer_restart sched_cfs_slack_timer(struct hrtimer *timer)
+{
+ struct cfs_bandwidth *cfs_b =
+ container_of(timer, struct cfs_bandwidth, slack_timer);
+ do_sched_cfs_slack_timer(cfs_b);
+
+ return HRTIMER_NORESTART;
+}
+
+static enum hrtimer_restart sched_cfs_period_timer(struct hrtimer *timer)
+{
+ struct cfs_bandwidth *cfs_b =
+ container_of(timer, struct cfs_bandwidth, period_timer);
+ ktime_t now;
+ int overrun;
+ int idle = 0;
+
+ for (;;) {
+ now = hrtimer_cb_get_time(timer);
+ overrun = hrtimer_forward(timer, now, cfs_b->period);
+
+ if (!overrun)
+ break;
+
+ idle = do_sched_cfs_period_timer(cfs_b, overrun);
+ }
+
+ return idle ? HRTIMER_NORESTART : HRTIMER_RESTART;
+}
+
+void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
+{
+ raw_spin_lock_init(&cfs_b->lock);
+ cfs_b->runtime = 0;
+ cfs_b->quota = RUNTIME_INF;
+ cfs_b->period = ns_to_ktime(default_cfs_period());
+
+ INIT_LIST_HEAD(&cfs_b->throttled_cfs_rq);
+ hrtimer_init(&cfs_b->period_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ cfs_b->period_timer.function = sched_cfs_period_timer;
+ hrtimer_init(&cfs_b->slack_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ cfs_b->slack_timer.function = sched_cfs_slack_timer;
+}
+
+static void init_cfs_rq_runtime(struct cfs_rq *cfs_rq)
+{
+ cfs_rq->runtime_enabled = 0;
+ INIT_LIST_HEAD(&cfs_rq->throttled_list);
+}
+
+/* requires cfs_b->lock, may release to reprogram timer */
+void __start_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
+{
+ /*
+ * The timer may be active because we're trying to set a new bandwidth
+ * period or because we're racing with the tear-down path
+ * (timer_active==0 becomes visible before the hrtimer call-back
+ * terminates). In either case we ensure that it's re-programmed
+ */
+ while (unlikely(hrtimer_active(&cfs_b->period_timer))) {
+ raw_spin_unlock(&cfs_b->lock);
+ /* ensure cfs_b->lock is available while we wait */
+ hrtimer_cancel(&cfs_b->period_timer);
+
+ raw_spin_lock(&cfs_b->lock);
+ /* if someone else restarted the timer then we're done */
+ if (cfs_b->timer_active)
+ return;
+ }
+
+ cfs_b->timer_active = 1;
+ start_bandwidth_timer(&cfs_b->period_timer, cfs_b->period);
+}
+
+static void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
+{
+ hrtimer_cancel(&cfs_b->period_timer);
+ hrtimer_cancel(&cfs_b->slack_timer);
+}
+
+void unthrottle_offline_cfs_rqs(struct rq *rq)
+{
+ struct cfs_rq *cfs_rq;
+
+ for_each_leaf_cfs_rq(rq, cfs_rq) {
+ struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
+
+ if (!cfs_rq->runtime_enabled)
+ continue;
+
+ /*
+ * clock_task is not advancing so we just need to make sure
+ * there's some valid quota amount
+ */
+ cfs_rq->runtime_remaining = cfs_b->quota;
+ if (cfs_rq_throttled(cfs_rq))
+ unthrottle_cfs_rq(cfs_rq);
+ }
+}
+
+#else /* CONFIG_CFS_BANDWIDTH */
static void account_cfs_rq_runtime(struct cfs_rq *cfs_rq,
unsigned long delta_exec) {}
static void check_cfs_rq_runtime(struct cfs_rq *cfs_rq) {}
{
return 0;
}
+
+void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
+
+#ifdef CONFIG_FAIR_GROUP_SCHED
+static void init_cfs_rq_runtime(struct cfs_rq *cfs_rq) {}
#endif
+static inline struct cfs_bandwidth *tg_cfs_bandwidth(struct task_group *tg)
+{
+ return NULL;
+}
+static inline void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
+void unthrottle_offline_cfs_rqs(struct rq *rq) {}
+
+#endif /* CONFIG_CFS_BANDWIDTH */
+
/**************************************************
* CFS operations on tasks:
*/
WARN_ON(task_rq(p) != rq);
- if (hrtick_enabled(rq) && cfs_rq->nr_running > 1) {
+ if (cfs_rq->nr_running > 1) {
u64 slice = sched_slice(cfs_rq, se);
u64 ran = se->sum_exec_runtime - se->prev_sum_exec_runtime;
s64 delta = slice - ran;
{
struct task_struct *curr = rq->curr;
- if (curr->sched_class != &fair_sched_class)
+ if (!hrtick_enabled(rq) || curr->sched_class != &fair_sched_class)
return;
if (cfs_rq_of(&curr->se)->nr_running < sched_nr_latency)
}
#ifdef CONFIG_SMP
+/* Used instead of source_load when we know the type == 0 */
+static unsigned long weighted_cpuload(const int cpu)
+{
+ return cpu_rq(cpu)->load.weight;
+}
+
+/*
+ * Return a low guess at the load of a migration-source cpu weighted
+ * according to the scheduling class and "nice" value.
+ *
+ * We want to under-estimate the load of migration sources, to
+ * balance conservatively.
+ */
+static unsigned long source_load(int cpu, int type)
+{
+ struct rq *rq = cpu_rq(cpu);
+ unsigned long total = weighted_cpuload(cpu);
+
+ if (type == 0 || !sched_feat(LB_BIAS))
+ return total;
+
+ return min(rq->cpu_load[type-1], total);
+}
+
+/*
+ * Return a high guess at the load of a migration-target cpu weighted
+ * according to the scheduling class and "nice" value.
+ */
+static unsigned long target_load(int cpu, int type)
+{
+ struct rq *rq = cpu_rq(cpu);
+ unsigned long total = weighted_cpuload(cpu);
+
+ if (type == 0 || !sched_feat(LB_BIAS))
+ return total;
+
+ return max(rq->cpu_load[type-1], total);
+}
+
+static unsigned long power_of(int cpu)
+{
+ return cpu_rq(cpu)->cpu_power;
+}
+
+static unsigned long cpu_avg_load_per_task(int cpu)
+{
+ struct rq *rq = cpu_rq(cpu);
+ unsigned long nr_running = ACCESS_ONCE(rq->nr_running);
+
+ if (nr_running)
+ return rq->load.weight / nr_running;
+
+ return 0;
+}
+
static void task_waking_fair(struct task_struct *p)
{
int prev_cpu = task_cpu(p);
struct sched_domain *sd;
struct sched_group *sg;
- int i, smt = 0;
+ int i;
/*
* If the task is going to be woken-up on this cpu and if it is
* Otherwise, iterate the domains and find an elegible idle cpu.
*/
rcu_read_lock();
-again:
- for_each_domain(target, sd) {
- if (!smt && (sd->flags & SD_SHARE_CPUPOWER))
- continue;
-
- if (smt && !(sd->flags & SD_SHARE_CPUPOWER))
- break;
-
- if (!(sd->flags & SD_SHARE_PKG_RESOURCES))
- break;
+ sd = rcu_dereference(per_cpu(sd_llc, target));
+ for_each_lower_domain(sd) {
sg = sd->groups;
do {
if (!cpumask_intersects(sched_group_cpus(sg),
sg = sg->next;
} while (sg != sd->groups);
}
- if (!smt) {
- smt = 1;
- goto again;
- }
done:
rcu_read_unlock();
int want_sd = 1;
int sync = wake_flags & WF_SYNC;
+ if (p->rt.nr_cpus_allowed == 1)
+ return prev_cpu;
+
if (sd_flag & SD_BALANCE_WAKE) {
if (cpumask_test_cpu(cpu, tsk_cpus_allowed(p)))
want_affine = 1;
} while (cfs_rq);
p = task_of(se);
- hrtick_start_fair(rq, p);
+ if (hrtick_enabled(rq))
+ hrtick_start_fair(rq, p);
return p;
}
* Update run-time statistics of the 'current'.
*/
update_curr(cfs_rq);
+ /*
+ * Tell update_rq_clock() that we've just updated,
+ * so we don't do microscopic update in schedule()
+ * and double the fastpath cost.
+ */
+ rq->skip_clock_update = 1;
}
set_skip_buddy(se);
}
/*
+ * Is this task likely cache-hot:
+ */
+static int
+task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
+{
+ s64 delta;
+
+ if (p->sched_class != &fair_sched_class)
+ return 0;
+
+ if (unlikely(p->policy == SCHED_IDLE))
+ return 0;
+
+ /*
+ * Buddy candidates are cache hot:
+ */
+ if (sched_feat(CACHE_HOT_BUDDY) && this_rq()->nr_running &&
+ (&p->se == cfs_rq_of(&p->se)->next ||
+ &p->se == cfs_rq_of(&p->se)->last))
+ return 1;
+
+ if (sysctl_sched_migration_cost == -1)
+ return 1;
+ if (sysctl_sched_migration_cost == 0)
+ return 0;
+
+ delta = now - p->se.exec_start;
+
+ return delta < (s64)sysctl_sched_migration_cost;
+}
+
+#define LBF_ALL_PINNED 0x01
+#define LBF_NEED_BREAK 0x02
+#define LBF_ABORT 0x04
+
+/*
* can_migrate_task - may task p from runqueue rq be migrated to this_cpu?
*/
static
int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
struct sched_domain *sd, enum cpu_idle_type idle,
- int *all_pinned)
+ int *lb_flags)
{
int tsk_cache_hot = 0;
/*
schedstat_inc(p, se.statistics.nr_failed_migrations_affine);
return 0;
}
- *all_pinned = 0;
+ *lb_flags &= ~LBF_ALL_PINNED;
if (task_running(rq, p)) {
schedstat_inc(p, se.statistics.nr_failed_migrations_running);
static unsigned long
balance_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
unsigned long max_load_move, struct sched_domain *sd,
- enum cpu_idle_type idle, int *all_pinned,
+ enum cpu_idle_type idle, int *lb_flags,
struct cfs_rq *busiest_cfs_rq)
{
int loops = 0, pulled = 0;
goto out;
list_for_each_entry_safe(p, n, &busiest_cfs_rq->tasks, se.group_node) {
- if (loops++ > sysctl_sched_nr_migrate)
+ if (loops++ > sysctl_sched_nr_migrate) {
+ *lb_flags |= LBF_NEED_BREAK;
break;
+ }
if ((p->se.load.weight >> 1) > rem_load_move ||
!can_migrate_task(p, busiest, this_cpu, sd, idle,
- all_pinned))
+ lb_flags))
continue;
pull_task(busiest, p, this_rq, this_cpu);
* kernels will stop after the first task is pulled to minimize
* the critical section.
*/
- if (idle == CPU_NEWLY_IDLE)
+ if (idle == CPU_NEWLY_IDLE) {
+ *lb_flags |= LBF_ABORT;
break;
+ }
#endif
/*
load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
unsigned long max_load_move,
struct sched_domain *sd, enum cpu_idle_type idle,
- int *all_pinned)
+ int *lb_flags)
{
long rem_load_move = max_load_move;
struct cfs_rq *busiest_cfs_rq;
unsigned long busiest_weight = busiest_cfs_rq->load.weight;
u64 rem_load, moved_load;
+ if (*lb_flags & (LBF_NEED_BREAK|LBF_ABORT))
+ break;
+
/*
* empty group or part of a throttled hierarchy
*/
rem_load = div_u64(rem_load, busiest_h_load + 1);
moved_load = balance_tasks(this_rq, this_cpu, busiest,
- rem_load, sd, idle, all_pinned,
+ rem_load, sd, idle, lb_flags,
busiest_cfs_rq);
if (!moved_load)
load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
unsigned long max_load_move,
struct sched_domain *sd, enum cpu_idle_type idle,
- int *all_pinned)
+ int *lb_flags)
{
return balance_tasks(this_rq, this_cpu, busiest,
- max_load_move, sd, idle, all_pinned,
+ max_load_move, sd, idle, lb_flags,
&busiest->cfs);
}
#endif
static int move_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
unsigned long max_load_move,
struct sched_domain *sd, enum cpu_idle_type idle,
- int *all_pinned)
+ int *lb_flags)
{
unsigned long total_load_moved = 0, load_moved;
do {
load_moved = load_balance_fair(this_rq, this_cpu, busiest,
max_load_move - total_load_moved,
- sd, idle, all_pinned);
+ sd, idle, lb_flags);
total_load_moved += load_moved;
+ if (*lb_flags & (LBF_NEED_BREAK|LBF_ABORT))
+ break;
+
#ifdef CONFIG_PREEMPT
/*
* NEWIDLE balancing is a source of latency, so preemptible
* kernels will stop after the first task is pulled to minimize
* the critical section.
*/
- if (idle == CPU_NEWLY_IDLE && this_rq->nr_running)
- break;
-
- if (raw_spin_is_contended(&this_rq->lock) ||
- raw_spin_is_contended(&busiest->lock))
+ if (idle == CPU_NEWLY_IDLE && this_rq->nr_running) {
+ *lb_flags |= LBF_ABORT;
break;
+ }
#endif
} while (load_moved && max_load_move > total_load_moved);
};
/**
- * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
- * @group: The group whose first cpu is to be returned.
- */
-static inline unsigned int group_first_cpu(struct sched_group *group)
-{
- return cpumask_first(sched_group_cpus(group));
-}
-
-/**
* get_sd_load_idx - Obtain the load index for a given sched domain.
* @sd: The sched_domain whose load_idx is to be obtained.
* @idle: The Idle status of the CPU for whose sd load_icx is obtained.
sdg->sgp->power = power;
}
-static void update_group_power(struct sched_domain *sd, int cpu)
+void update_group_power(struct sched_domain *sd, int cpu)
{
struct sched_domain *child = sd->child;
struct sched_group *group, *sdg = sd->groups;
} while (sg != sd->groups);
}
-int __weak arch_sd_sibling_asym_packing(void)
-{
- return 0*SD_ASYM_PACKING;
-}
-
/**
* check_asym_packing - Check to see if the group is packed into the
* sched doman.
#define MAX_PINNED_INTERVAL 512
/* Working cpumask for load_balance and load_balance_newidle. */
-static DEFINE_PER_CPU(cpumask_var_t, load_balance_tmpmask);
+DEFINE_PER_CPU(cpumask_var_t, load_balance_tmpmask);
static int need_active_balance(struct sched_domain *sd, int idle,
int busiest_cpu, int this_cpu)
struct sched_domain *sd, enum cpu_idle_type idle,
int *balance)
{
- int ld_moved, all_pinned = 0, active_balance = 0;
+ int ld_moved, lb_flags = 0, active_balance = 0;
struct sched_group *group;
unsigned long imbalance;
struct rq *busiest;
* still unbalanced. ld_moved simply stays zero, so it is
* correctly treated as an imbalance.
*/
- all_pinned = 1;
+ lb_flags |= LBF_ALL_PINNED;
local_irq_save(flags);
double_rq_lock(this_rq, busiest);
ld_moved = move_tasks(this_rq, this_cpu, busiest,
- imbalance, sd, idle, &all_pinned);
+ imbalance, sd, idle, &lb_flags);
double_rq_unlock(this_rq, busiest);
local_irq_restore(flags);
if (ld_moved && this_cpu != smp_processor_id())
resched_cpu(this_cpu);
+ if (lb_flags & LBF_ABORT)
+ goto out_balanced;
+
+ if (lb_flags & LBF_NEED_BREAK) {
+ lb_flags &= ~LBF_NEED_BREAK;
+ goto redo;
+ }
+
/* All tasks on this runqueue were pinned by CPU affinity */
- if (unlikely(all_pinned)) {
+ if (unlikely(lb_flags & LBF_ALL_PINNED)) {
cpumask_clear_cpu(cpu_of(busiest), cpus);
if (!cpumask_empty(cpus))
goto redo;
tsk_cpus_allowed(busiest->curr))) {
raw_spin_unlock_irqrestore(&busiest->lock,
flags);
- all_pinned = 1;
+ lb_flags |= LBF_ALL_PINNED;
goto out_one_pinned;
}
out_one_pinned:
/* tune up the balancing interval */
- if ((all_pinned && sd->balance_interval < MAX_PINNED_INTERVAL) ||
+ if (((lb_flags & LBF_ALL_PINNED) &&
+ sd->balance_interval < MAX_PINNED_INTERVAL) ||
(sd->balance_interval < sd->max_interval))
sd->balance_interval *= 2;
* idle_balance is called by schedule() if this_cpu is about to become
* idle. Attempts to pull tasks from other CPUs.
*/
-static void idle_balance(int this_cpu, struct rq *this_rq)
+void idle_balance(int this_cpu, struct rq *this_rq)
{
struct sched_domain *sd;
int pulled_task = 0;
#ifdef CONFIG_NO_HZ
/*
* idle load balancing details
- * - One of the idle CPUs nominates itself as idle load_balancer, while
- * entering idle.
- * - This idle load balancer CPU will also go into tickless mode when
- * it is idle, just like all other idle CPUs
* - When one of the busy CPUs notice that there may be an idle rebalancing
* needed, they will kick the idle load balancer, which then does idle
* load balancing for all the idle CPUs.
*/
static struct {
- atomic_t load_balancer;
- atomic_t first_pick_cpu;
- atomic_t second_pick_cpu;
cpumask_var_t idle_cpus_mask;
- cpumask_var_t grp_idle_mask;
+ atomic_t nr_cpus;
unsigned long next_balance; /* in jiffy units */
} nohz ____cacheline_aligned;
-int get_nohz_load_balancer(void)
-{
- return atomic_read(&nohz.load_balancer);
-}
-
#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
/**
* lowest_flag_domain - Return lowest sched_domain containing flag.
(sd && (sd->flags & flag)); sd = sd->parent)
/**
- * is_semi_idle_group - Checks if the given sched_group is semi-idle.
- * @ilb_group: group to be checked for semi-idleness
- *
- * Returns: 1 if the group is semi-idle. 0 otherwise.
- *
- * We define a sched_group to be semi idle if it has atleast one idle-CPU
- * and atleast one non-idle CPU. This helper function checks if the given
- * sched_group is semi-idle or not.
- */
-static inline int is_semi_idle_group(struct sched_group *ilb_group)
-{
- cpumask_and(nohz.grp_idle_mask, nohz.idle_cpus_mask,
- sched_group_cpus(ilb_group));
-
- /*
- * A sched_group is semi-idle when it has atleast one busy cpu
- * and atleast one idle cpu.
- */
- if (cpumask_empty(nohz.grp_idle_mask))
- return 0;
-
- if (cpumask_equal(nohz.grp_idle_mask, sched_group_cpus(ilb_group)))
- return 0;
-
- return 1;
-}
-/**
* find_new_ilb - Finds the optimum idle load balancer for nomination.
* @cpu: The cpu which is nominating a new idle_load_balancer.
*
*/
static int find_new_ilb(int cpu)
{
+ int ilb = cpumask_first(nohz.idle_cpus_mask);
+ struct sched_group *ilbg;
struct sched_domain *sd;
- struct sched_group *ilb_group;
- int ilb = nr_cpu_ids;
/*
* Have idle load balancer selection from semi-idle packages only
rcu_read_lock();
for_each_flag_domain(cpu, sd, SD_POWERSAVINGS_BALANCE) {
- ilb_group = sd->groups;
+ ilbg = sd->groups;
do {
- if (is_semi_idle_group(ilb_group)) {
- ilb = cpumask_first(nohz.grp_idle_mask);
+ if (ilbg->group_weight !=
+ atomic_read(&ilbg->sgp->nr_busy_cpus)) {
+ ilb = cpumask_first_and(nohz.idle_cpus_mask,
+ sched_group_cpus(ilbg));
goto unlock;
}
- ilb_group = ilb_group->next;
+ ilbg = ilbg->next;
- } while (ilb_group != sd->groups);
+ } while (ilbg != sd->groups);
}
unlock:
rcu_read_unlock();
out_done:
- return ilb;
+ if (ilb < nr_cpu_ids && idle_cpu(ilb))
+ return ilb;
+
+ return nr_cpu_ids;
}
#else /* (CONFIG_SCHED_MC || CONFIG_SCHED_SMT) */
static inline int find_new_ilb(int call_cpu)
nohz.next_balance++;
- ilb_cpu = get_nohz_load_balancer();
-
- if (ilb_cpu >= nr_cpu_ids) {
- ilb_cpu = cpumask_first(nohz.idle_cpus_mask);
- if (ilb_cpu >= nr_cpu_ids)
- return;
- }
+ ilb_cpu = find_new_ilb(cpu);
- if (!cpu_rq(ilb_cpu)->nohz_balance_kick) {
- cpu_rq(ilb_cpu)->nohz_balance_kick = 1;
+ if (ilb_cpu >= nr_cpu_ids)
+ return;
- smp_mb();
- /*
- * Use smp_send_reschedule() instead of resched_cpu().
- * This way we generate a sched IPI on the target cpu which
- * is idle. And the softirq performing nohz idle load balance
- * will be run before returning from the IPI.
- */
- smp_send_reschedule(ilb_cpu);
- }
+ if (test_and_set_bit(NOHZ_BALANCE_KICK, nohz_flags(ilb_cpu)))
+ return;
+ /*
+ * Use smp_send_reschedule() instead of resched_cpu().
+ * This way we generate a sched IPI on the target cpu which
+ * is idle. And the softirq performing nohz idle load balance
+ * will be run before returning from the IPI.
+ */
+ smp_send_reschedule(ilb_cpu);
return;
}
-/*
- * This routine will try to nominate the ilb (idle load balancing)
- * owner among the cpus whose ticks are stopped. ilb owner will do the idle
- * load balancing on behalf of all those cpus.
- *
- * When the ilb owner becomes busy, we will not have new ilb owner until some
- * idle CPU wakes up and goes back to idle or some busy CPU tries to kick
- * idle load balancing by kicking one of the idle CPUs.
- *
- * Ticks are stopped for the ilb owner as well, with busy CPU kicking this
- * ilb owner CPU in future (when there is a need for idle load balancing on
- * behalf of all idle CPUs).
- */
-void select_nohz_load_balancer(int stop_tick)
+static inline void set_cpu_sd_state_busy(void)
{
+ struct sched_domain *sd;
int cpu = smp_processor_id();
- if (stop_tick) {
- if (!cpu_active(cpu)) {
- if (atomic_read(&nohz.load_balancer) != cpu)
- return;
-
- /*
- * If we are going offline and still the leader,
- * give up!
- */
- if (atomic_cmpxchg(&nohz.load_balancer, cpu,
- nr_cpu_ids) != cpu)
- BUG();
+ if (!test_bit(NOHZ_IDLE, nohz_flags(cpu)))
+ return;
+ clear_bit(NOHZ_IDLE, nohz_flags(cpu));
- return;
- }
+ rcu_read_lock();
+ for_each_domain(cpu, sd)
+ atomic_inc(&sd->groups->sgp->nr_busy_cpus);
+ rcu_read_unlock();
+}
- cpumask_set_cpu(cpu, nohz.idle_cpus_mask);
+void set_cpu_sd_state_idle(void)
+{
+ struct sched_domain *sd;
+ int cpu = smp_processor_id();
- if (atomic_read(&nohz.first_pick_cpu) == cpu)
- atomic_cmpxchg(&nohz.first_pick_cpu, cpu, nr_cpu_ids);
- if (atomic_read(&nohz.second_pick_cpu) == cpu)
- atomic_cmpxchg(&nohz.second_pick_cpu, cpu, nr_cpu_ids);
+ if (test_bit(NOHZ_IDLE, nohz_flags(cpu)))
+ return;
+ set_bit(NOHZ_IDLE, nohz_flags(cpu));
- if (atomic_read(&nohz.load_balancer) >= nr_cpu_ids) {
- int new_ilb;
+ rcu_read_lock();
+ for_each_domain(cpu, sd)
+ atomic_dec(&sd->groups->sgp->nr_busy_cpus);
+ rcu_read_unlock();
+}
- /* make me the ilb owner */
- if (atomic_cmpxchg(&nohz.load_balancer, nr_cpu_ids,
- cpu) != nr_cpu_ids)
- return;
+/*
+ * This routine will record that this cpu is going idle with tick stopped.
+ * This info will be used in performing idle load balancing in the future.
+ */
+void select_nohz_load_balancer(int stop_tick)
+{
+ int cpu = smp_processor_id();
- /*
- * Check to see if there is a more power-efficient
- * ilb.
- */
- new_ilb = find_new_ilb(cpu);
- if (new_ilb < nr_cpu_ids && new_ilb != cpu) {
- atomic_set(&nohz.load_balancer, nr_cpu_ids);
- resched_cpu(new_ilb);
- return;
- }
- return;
- }
- } else {
- if (!cpumask_test_cpu(cpu, nohz.idle_cpus_mask))
+ if (stop_tick) {
+ if (test_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu)))
return;
- cpumask_clear_cpu(cpu, nohz.idle_cpus_mask);
-
- if (atomic_read(&nohz.load_balancer) == cpu)
- if (atomic_cmpxchg(&nohz.load_balancer, cpu,
- nr_cpu_ids) != cpu)
- BUG();
+ cpumask_set_cpu(cpu, nohz.idle_cpus_mask);
+ atomic_inc(&nohz.nr_cpus);
+ set_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu));
}
return;
}
* Scale the max load_balance interval with the number of CPUs in the system.
* This trades load-balance latency on larger machines for less cross talk.
*/
-static void update_max_interval(void)
+void update_max_interval(void)
{
max_load_balance_interval = HZ*num_online_cpus()/10;
}
struct rq *rq;
int balance_cpu;
- if (idle != CPU_IDLE || !this_rq->nohz_balance_kick)
- return;
+ if (idle != CPU_IDLE ||
+ !test_bit(NOHZ_BALANCE_KICK, nohz_flags(this_cpu)))
+ goto end;
for_each_cpu(balance_cpu, nohz.idle_cpus_mask) {
- if (balance_cpu == this_cpu)
+ if (balance_cpu == this_cpu || !idle_cpu(balance_cpu))
continue;
/*
* work being done for other cpus. Next load
* balancing owner will pick it up.
*/
- if (need_resched()) {
- this_rq->nohz_balance_kick = 0;
+ if (need_resched())
break;
- }
raw_spin_lock_irq(&this_rq->lock);
update_rq_clock(this_rq);
this_rq->next_balance = rq->next_balance;
}
nohz.next_balance = this_rq->next_balance;
- this_rq->nohz_balance_kick = 0;
+end:
+ clear_bit(NOHZ_BALANCE_KICK, nohz_flags(this_cpu));
}
/*
- * Current heuristic for kicking the idle load balancer
- * - first_pick_cpu is the one of the busy CPUs. It will kick
- * idle load balancer when it has more than one process active. This
- * eliminates the need for idle load balancing altogether when we have
- * only one running process in the system (common case).
- * - If there are more than one busy CPU, idle load balancer may have
- * to run for active_load_balance to happen (i.e., two busy CPUs are
- * SMT or core siblings and can run better if they move to different
- * physical CPUs). So, second_pick_cpu is the second of the busy CPUs
- * which will kick idle load balancer as soon as it has any load.
+ * Current heuristic for kicking the idle load balancer in the presence
+ * of an idle cpu is the system.
+ * - This rq has more than one task.
+ * - At any scheduler domain level, this cpu's scheduler group has multiple
+ * busy cpu's exceeding the group's power.
+ * - For SD_ASYM_PACKING, if the lower numbered cpu's in the scheduler
+ * domain span are idle.
*/
static inline int nohz_kick_needed(struct rq *rq, int cpu)
{
unsigned long now = jiffies;
- int ret;
- int first_pick_cpu, second_pick_cpu;
+ struct sched_domain *sd;
- if (time_before(now, nohz.next_balance))
+ if (unlikely(idle_cpu(cpu)))
return 0;
- if (idle_cpu(cpu))
- return 0;
+ /*
+ * We may be recently in ticked or tickless idle mode. At the first
+ * busy tick after returning from idle, we will update the busy stats.
+ */
+ set_cpu_sd_state_busy();
+ if (unlikely(test_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu)))) {
+ clear_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu));
+ cpumask_clear_cpu(cpu, nohz.idle_cpus_mask);
+ atomic_dec(&nohz.nr_cpus);
+ }
- first_pick_cpu = atomic_read(&nohz.first_pick_cpu);
- second_pick_cpu = atomic_read(&nohz.second_pick_cpu);
+ /*
+ * None are in tickless mode and hence no need for NOHZ idle load
+ * balancing.
+ */
+ if (likely(!atomic_read(&nohz.nr_cpus)))
+ return 0;
- if (first_pick_cpu < nr_cpu_ids && first_pick_cpu != cpu &&
- second_pick_cpu < nr_cpu_ids && second_pick_cpu != cpu)
+ if (time_before(now, nohz.next_balance))
return 0;
- ret = atomic_cmpxchg(&nohz.first_pick_cpu, nr_cpu_ids, cpu);
- if (ret == nr_cpu_ids || ret == cpu) {
- atomic_cmpxchg(&nohz.second_pick_cpu, cpu, nr_cpu_ids);
- if (rq->nr_running > 1)
- return 1;
- } else {
- ret = atomic_cmpxchg(&nohz.second_pick_cpu, nr_cpu_ids, cpu);
- if (ret == nr_cpu_ids || ret == cpu) {
- if (rq->nr_running)
- return 1;
- }
+ if (rq->nr_running >= 2)
+ goto need_kick;
+
+ rcu_read_lock();
+ for_each_domain(cpu, sd) {
+ struct sched_group *sg = sd->groups;
+ struct sched_group_power *sgp = sg->sgp;
+ int nr_busy = atomic_read(&sgp->nr_busy_cpus);
+
+ if (sd->flags & SD_SHARE_PKG_RESOURCES && nr_busy > 1)
+ goto need_kick_unlock;
+
+ if (sd->flags & SD_ASYM_PACKING && nr_busy != sg->group_weight
+ && (cpumask_first_and(nohz.idle_cpus_mask,
+ sched_domain_span(sd)) < cpu))
+ goto need_kick_unlock;
+
+ if (!(sd->flags & (SD_SHARE_PKG_RESOURCES | SD_ASYM_PACKING)))
+ break;
}
+ rcu_read_unlock();
return 0;
+
+need_kick_unlock:
+ rcu_read_unlock();
+need_kick:
+ return 1;
}
#else
static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle) { }
/*
* Trigger the SCHED_SOFTIRQ if it is time to do periodic load balancing.
*/
-static inline void trigger_load_balance(struct rq *rq, int cpu)
+void trigger_load_balance(struct rq *rq, int cpu)
{
/* Don't need to rebalance while attached to NULL domain */
if (time_after_eq(jiffies, rq->next_balance) &&
likely(!on_null_domain(cpu)))
raise_softirq(SCHED_SOFTIRQ);
#ifdef CONFIG_NO_HZ
- else if (nohz_kick_needed(rq, cpu) && likely(!on_null_domain(cpu)))
+ if (nohz_kick_needed(rq, cpu) && likely(!on_null_domain(cpu)))
nohz_balancer_kick(cpu);
#endif
}
update_sysctl();
}
-#else /* CONFIG_SMP */
-
-/*
- * on UP we do not need to balance between CPUs:
- */
-static inline void idle_balance(int cpu, struct rq *rq)
-{
-}
-
#endif /* CONFIG_SMP */
/*
*/
static void task_fork_fair(struct task_struct *p)
{
- struct cfs_rq *cfs_rq = task_cfs_rq(current);
- struct sched_entity *se = &p->se, *curr = cfs_rq->curr;
+ struct cfs_rq *cfs_rq;
+ struct sched_entity *se = &p->se, *curr;
int this_cpu = smp_processor_id();
struct rq *rq = this_rq();
unsigned long flags;
update_rq_clock(rq);
+ cfs_rq = task_cfs_rq(current);
+ curr = cfs_rq->curr;
+
if (unlikely(task_cpu(p) != this_cpu)) {
rcu_read_lock();
__set_task_cpu(p, this_cpu);
}
}
+void init_cfs_rq(struct cfs_rq *cfs_rq)
+{
+ cfs_rq->tasks_timeline = RB_ROOT;
+ INIT_LIST_HEAD(&cfs_rq->tasks);
+ cfs_rq->min_vruntime = (u64)(-(1LL << 20));
+#ifndef CONFIG_64BIT
+ cfs_rq->min_vruntime_copy = cfs_rq->min_vruntime;
+#endif
+}
+
#ifdef CONFIG_FAIR_GROUP_SCHED
static void task_move_group_fair(struct task_struct *p, int on_rq)
{
* to another cgroup's rq. This does somewhat interfere with the
* fair sleeper stuff for the first placement, but who cares.
*/
+ /*
+ * When !on_rq, vruntime of the task has usually NOT been normalized.
+ * But there are some cases where it has already been normalized:
+ *
+ * - Moving a forked child which is waiting for being woken up by
+ * wake_up_new_task().
+ * - Moving a task which has been woken up by try_to_wake_up() and
+ * waiting for actually being woken up by sched_ttwu_pending().
+ *
+ * To prevent boost or penalty in the new cfs_rq caused by delta
+ * min_vruntime between the two cfs_rqs, we skip vruntime adjustment.
+ */
+ if (!on_rq && (!p->se.sum_exec_runtime || p->state == TASK_WAKING))
+ on_rq = 1;
+
if (!on_rq)
p->se.vruntime -= cfs_rq_of(&p->se)->min_vruntime;
set_task_rq(p, task_cpu(p));
if (!on_rq)
p->se.vruntime += cfs_rq_of(&p->se)->min_vruntime;
}
+
+void free_fair_sched_group(struct task_group *tg)
+{
+ int i;
+
+ destroy_cfs_bandwidth(tg_cfs_bandwidth(tg));
+
+ for_each_possible_cpu(i) {
+ if (tg->cfs_rq)
+ kfree(tg->cfs_rq[i]);
+ if (tg->se)
+ kfree(tg->se[i]);
+ }
+
+ kfree(tg->cfs_rq);
+ kfree(tg->se);
+}
+
+int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
+{
+ struct cfs_rq *cfs_rq;
+ struct sched_entity *se;
+ int i;
+
+ tg->cfs_rq = kzalloc(sizeof(cfs_rq) * nr_cpu_ids, GFP_KERNEL);
+ if (!tg->cfs_rq)
+ goto err;
+ tg->se = kzalloc(sizeof(se) * nr_cpu_ids, GFP_KERNEL);
+ if (!tg->se)
+ goto err;
+
+ tg->shares = NICE_0_LOAD;
+
+ init_cfs_bandwidth(tg_cfs_bandwidth(tg));
+
+ for_each_possible_cpu(i) {
+ cfs_rq = kzalloc_node(sizeof(struct cfs_rq),
+ GFP_KERNEL, cpu_to_node(i));
+ if (!cfs_rq)
+ goto err;
+
+ se = kzalloc_node(sizeof(struct sched_entity),
+ GFP_KERNEL, cpu_to_node(i));
+ if (!se)
+ goto err_free_rq;
+
+ init_cfs_rq(cfs_rq);
+ init_tg_cfs_entry(tg, cfs_rq, se, i, parent->se[i]);
+ }
+
+ return 1;
+
+err_free_rq:
+ kfree(cfs_rq);
+err:
+ return 0;
+}
+
+void unregister_fair_sched_group(struct task_group *tg, int cpu)
+{
+ struct rq *rq = cpu_rq(cpu);
+ unsigned long flags;
+
+ /*
+ * Only empty task groups can be destroyed; so we can speculatively
+ * check on_list without danger of it being re-added.
+ */
+ if (!tg->cfs_rq[cpu]->on_list)
+ return;
+
+ raw_spin_lock_irqsave(&rq->lock, flags);
+ list_del_leaf_cfs_rq(tg->cfs_rq[cpu]);
+ raw_spin_unlock_irqrestore(&rq->lock, flags);
+}
+
+void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
+ struct sched_entity *se, int cpu,
+ struct sched_entity *parent)
+{
+ struct rq *rq = cpu_rq(cpu);
+
+ cfs_rq->tg = tg;
+ cfs_rq->rq = rq;
+#ifdef CONFIG_SMP
+ /* allow initial update_cfs_load() to truncate */
+ cfs_rq->load_stamp = 1;
#endif
+ init_cfs_rq_runtime(cfs_rq);
+
+ tg->cfs_rq[cpu] = cfs_rq;
+ tg->se[cpu] = se;
+
+ /* se could be NULL for root_task_group */
+ if (!se)
+ return;
+
+ if (!parent)
+ se->cfs_rq = &rq->cfs;
+ else
+ se->cfs_rq = parent->my_q;
+
+ se->my_q = cfs_rq;
+ update_load_set(&se->load, 0);
+ se->parent = parent;
+}
+
+static DEFINE_MUTEX(shares_mutex);
+
+int sched_group_set_shares(struct task_group *tg, unsigned long shares)
+{
+ int i;
+ unsigned long flags;
+
+ /*
+ * We can't change the weight of the root cgroup.
+ */
+ if (!tg->se[0])
+ return -EINVAL;
+
+ shares = clamp(shares, scale_load(MIN_SHARES), scale_load(MAX_SHARES));
+
+ mutex_lock(&shares_mutex);
+ if (tg->shares == shares)
+ goto done;
+
+ tg->shares = shares;
+ for_each_possible_cpu(i) {
+ struct rq *rq = cpu_rq(i);
+ struct sched_entity *se;
+
+ se = tg->se[i];
+ /* Propagate contribution to hierarchy */
+ raw_spin_lock_irqsave(&rq->lock, flags);
+ for_each_sched_entity(se)
+ update_cfs_shares(group_cfs_rq(se));
+ raw_spin_unlock_irqrestore(&rq->lock, flags);
+ }
+
+done:
+ mutex_unlock(&shares_mutex);
+ return 0;
+}
+#else /* CONFIG_FAIR_GROUP_SCHED */
+
+void free_fair_sched_group(struct task_group *tg) { }
+
+int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
+{
+ return 1;
+}
+
+void unregister_fair_sched_group(struct task_group *tg, int cpu) { }
+
+#endif /* CONFIG_FAIR_GROUP_SCHED */
+
static unsigned int get_rr_interval_fair(struct rq *rq, struct task_struct *task)
{
/*
* All the scheduling class methods:
*/
-static const struct sched_class fair_sched_class = {
+const struct sched_class fair_sched_class = {
.next = &idle_sched_class,
.enqueue_task = enqueue_task_fair,
.dequeue_task = dequeue_task_fair,
};
#ifdef CONFIG_SCHED_DEBUG
-static void print_cfs_stats(struct seq_file *m, int cpu)
+void print_cfs_stats(struct seq_file *m, int cpu)
{
struct cfs_rq *cfs_rq;
rcu_read_unlock();
}
#endif
+
+__init void init_sched_fair_class(void)
+{
+#ifdef CONFIG_SMP
+ open_softirq(SCHED_SOFTIRQ, run_rebalance_domains);
+
+#ifdef CONFIG_NO_HZ
+ zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
+#endif
+#endif /* SMP */
+
+}
* them to run sooner, but does not allow tons of sleepers to
* rip the spread apart.
*/
-SCHED_FEAT(GENTLE_FAIR_SLEEPERS, 1)
+SCHED_FEAT(GENTLE_FAIR_SLEEPERS, true)
/*
* Place new tasks ahead so that they do not starve already running
* tasks
*/
-SCHED_FEAT(START_DEBIT, 1)
+SCHED_FEAT(START_DEBIT, true)
/*
* Based on load and program behaviour, see if it makes sense to place
* improve cache locality. Typically used with SYNC wakeups as
* generated by pipes and the like, see also SYNC_WAKEUPS.
*/
-SCHED_FEAT(AFFINE_WAKEUPS, 1)
+SCHED_FEAT(AFFINE_WAKEUPS, true)
/*
* Prefer to schedule the task we woke last (assuming it failed
* wakeup-preemption), since its likely going to consume data we
* touched, increases cache locality.
*/
-SCHED_FEAT(NEXT_BUDDY, 0)
+SCHED_FEAT(NEXT_BUDDY, false)
/*
* Prefer to schedule the task that ran last (when we did
* wake-preempt) as that likely will touch the same data, increases
* cache locality.
*/
-SCHED_FEAT(LAST_BUDDY, 1)
+SCHED_FEAT(LAST_BUDDY, true)
/*
* Consider buddies to be cache hot, decreases the likelyness of a
* cache buddy being migrated away, increases cache locality.
*/
-SCHED_FEAT(CACHE_HOT_BUDDY, 1)
+SCHED_FEAT(CACHE_HOT_BUDDY, true)
/*
* Use arch dependent cpu power functions
*/
-SCHED_FEAT(ARCH_POWER, 0)
+SCHED_FEAT(ARCH_POWER, false)
-SCHED_FEAT(HRTICK, 0)
-SCHED_FEAT(DOUBLE_TICK, 0)
-SCHED_FEAT(LB_BIAS, 1)
+SCHED_FEAT(HRTICK, false)
+SCHED_FEAT(DOUBLE_TICK, false)
+SCHED_FEAT(LB_BIAS, true)
/*
* Spin-wait on mutex acquisition when the mutex owner is running on
* another cpu -- assumes that when the owner is running, it will soon
* release the lock. Decreases scheduling overhead.
*/
-SCHED_FEAT(OWNER_SPIN, 1)
+SCHED_FEAT(OWNER_SPIN, true)
/*
* Decrement CPU power based on time not spent running tasks
*/
-SCHED_FEAT(NONTASK_POWER, 1)
+SCHED_FEAT(NONTASK_POWER, true)
/*
* Queue remote wakeups on the target CPU and process them
* using the scheduler IPI. Reduces rq->lock contention/bounces.
*/
-SCHED_FEAT(TTWU_QUEUE, 1)
+SCHED_FEAT(TTWU_QUEUE, true)
-SCHED_FEAT(FORCE_SD_OVERLAP, 0)
-SCHED_FEAT(RT_RUNTIME_SHARE, 1)
+SCHED_FEAT(FORCE_SD_OVERLAP, false)
+SCHED_FEAT(RT_RUNTIME_SHARE, true)
+#include "sched.h"
+
/*
* idle-task scheduling class.
*
/*
* Simple, special scheduling class for the per-CPU idle tasks:
*/
-static const struct sched_class idle_sched_class = {
+const struct sched_class idle_sched_class = {
/* .next is NULL */
/* no enqueue/yield_task for idle tasks */
* policies)
*/
+#include "sched.h"
+
+#include <linux/slab.h>
+
+static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun);
+
+struct rt_bandwidth def_rt_bandwidth;
+
+static enum hrtimer_restart sched_rt_period_timer(struct hrtimer *timer)
+{
+ struct rt_bandwidth *rt_b =
+ container_of(timer, struct rt_bandwidth, rt_period_timer);
+ ktime_t now;
+ int overrun;
+ int idle = 0;
+
+ for (;;) {
+ now = hrtimer_cb_get_time(timer);
+ overrun = hrtimer_forward(timer, now, rt_b->rt_period);
+
+ if (!overrun)
+ break;
+
+ idle = do_sched_rt_period_timer(rt_b, overrun);
+ }
+
+ return idle ? HRTIMER_NORESTART : HRTIMER_RESTART;
+}
+
+void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime)
+{
+ rt_b->rt_period = ns_to_ktime(period);
+ rt_b->rt_runtime = runtime;
+
+ raw_spin_lock_init(&rt_b->rt_runtime_lock);
+
+ hrtimer_init(&rt_b->rt_period_timer,
+ CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ rt_b->rt_period_timer.function = sched_rt_period_timer;
+}
+
+static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
+{
+ if (!rt_bandwidth_enabled() || rt_b->rt_runtime == RUNTIME_INF)
+ return;
+
+ if (hrtimer_active(&rt_b->rt_period_timer))
+ return;
+
+ raw_spin_lock(&rt_b->rt_runtime_lock);
+ start_bandwidth_timer(&rt_b->rt_period_timer, rt_b->rt_period);
+ raw_spin_unlock(&rt_b->rt_runtime_lock);
+}
+
+void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq)
+{
+ struct rt_prio_array *array;
+ int i;
+
+ array = &rt_rq->active;
+ for (i = 0; i < MAX_RT_PRIO; i++) {
+ INIT_LIST_HEAD(array->queue + i);
+ __clear_bit(i, array->bitmap);
+ }
+ /* delimiter for bitsearch: */
+ __set_bit(MAX_RT_PRIO, array->bitmap);
+
+#if defined CONFIG_SMP
+ rt_rq->highest_prio.curr = MAX_RT_PRIO;
+ rt_rq->highest_prio.next = MAX_RT_PRIO;
+ rt_rq->rt_nr_migratory = 0;
+ rt_rq->overloaded = 0;
+ plist_head_init(&rt_rq->pushable_tasks);
+#endif
+
+ rt_rq->rt_time = 0;
+ rt_rq->rt_throttled = 0;
+ rt_rq->rt_runtime = 0;
+ raw_spin_lock_init(&rt_rq->rt_runtime_lock);
+}
+
#ifdef CONFIG_RT_GROUP_SCHED
+static void destroy_rt_bandwidth(struct rt_bandwidth *rt_b)
+{
+ hrtimer_cancel(&rt_b->rt_period_timer);
+}
#define rt_entity_is_task(rt_se) (!(rt_se)->my_q)
return rt_se->rt_rq;
}
+void free_rt_sched_group(struct task_group *tg)
+{
+ int i;
+
+ if (tg->rt_se)
+ destroy_rt_bandwidth(&tg->rt_bandwidth);
+
+ for_each_possible_cpu(i) {
+ if (tg->rt_rq)
+ kfree(tg->rt_rq[i]);
+ if (tg->rt_se)
+ kfree(tg->rt_se[i]);
+ }
+
+ kfree(tg->rt_rq);
+ kfree(tg->rt_se);
+}
+
+void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
+ struct sched_rt_entity *rt_se, int cpu,
+ struct sched_rt_entity *parent)
+{
+ struct rq *rq = cpu_rq(cpu);
+
+ rt_rq->highest_prio.curr = MAX_RT_PRIO;
+ rt_rq->rt_nr_boosted = 0;
+ rt_rq->rq = rq;
+ rt_rq->tg = tg;
+
+ tg->rt_rq[cpu] = rt_rq;
+ tg->rt_se[cpu] = rt_se;
+
+ if (!rt_se)
+ return;
+
+ if (!parent)
+ rt_se->rt_rq = &rq->rt;
+ else
+ rt_se->rt_rq = parent->my_q;
+
+ rt_se->my_q = rt_rq;
+ rt_se->parent = parent;
+ INIT_LIST_HEAD(&rt_se->run_list);
+}
+
+int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
+{
+ struct rt_rq *rt_rq;
+ struct sched_rt_entity *rt_se;
+ int i;
+
+ tg->rt_rq = kzalloc(sizeof(rt_rq) * nr_cpu_ids, GFP_KERNEL);
+ if (!tg->rt_rq)
+ goto err;
+ tg->rt_se = kzalloc(sizeof(rt_se) * nr_cpu_ids, GFP_KERNEL);
+ if (!tg->rt_se)
+ goto err;
+
+ init_rt_bandwidth(&tg->rt_bandwidth,
+ ktime_to_ns(def_rt_bandwidth.rt_period), 0);
+
+ for_each_possible_cpu(i) {
+ rt_rq = kzalloc_node(sizeof(struct rt_rq),
+ GFP_KERNEL, cpu_to_node(i));
+ if (!rt_rq)
+ goto err;
+
+ rt_se = kzalloc_node(sizeof(struct sched_rt_entity),
+ GFP_KERNEL, cpu_to_node(i));
+ if (!rt_se)
+ goto err_free_rq;
+
+ init_rt_rq(rt_rq, cpu_rq(i));
+ rt_rq->rt_runtime = tg->rt_bandwidth.rt_runtime;
+ init_tg_rt_entry(tg, rt_rq, rt_se, i, parent->rt_se[i]);
+ }
+
+ return 1;
+
+err_free_rq:
+ kfree(rt_rq);
+err:
+ return 0;
+}
+
#else /* CONFIG_RT_GROUP_SCHED */
#define rt_entity_is_task(rt_se) (1)
return &rq->rt;
}
+void free_rt_sched_group(struct task_group *tg) { }
+
+int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
+{
+ return 1;
+}
#endif /* CONFIG_RT_GROUP_SCHED */
#ifdef CONFIG_SMP
raw_spin_unlock_irqrestore(&rq->lock, flags);
}
+int update_runtime(struct notifier_block *nfb, unsigned long action, void *hcpu)
+{
+ int cpu = (int)(long)hcpu;
+
+ switch (action) {
+ case CPU_DOWN_PREPARE:
+ case CPU_DOWN_PREPARE_FROZEN:
+ disable_runtime(cpu_rq(cpu));
+ return NOTIFY_OK;
+
+ case CPU_DOWN_FAILED:
+ case CPU_DOWN_FAILED_FROZEN:
+ case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
+ enable_runtime(cpu_rq(cpu));
+ return NOTIFY_OK;
+
+ default:
+ return NOTIFY_DONE;
+ }
+}
+
static int balance_runtime(struct rt_rq *rt_rq)
{
int more = 0;
if (rt_rq->rt_throttled)
return rt_rq_throttled(rt_rq);
- if (sched_rt_runtime(rt_rq) >= sched_rt_period(rt_rq))
+ if (runtime >= sched_rt_period(rt_rq))
return 0;
balance_runtime(rt_rq);
}
/*
- * Put task to the end of the run list without the overhead of dequeue
- * followed by enqueue.
+ * Put task to the head or the end of the run list without the overhead of
+ * dequeue followed by enqueue.
*/
static void
requeue_rt_entity(struct rt_rq *rt_rq, struct sched_rt_entity *rt_se, int head)
cpu = task_cpu(p);
+ if (p->rt.nr_cpus_allowed == 1)
+ goto out;
+
/* For anything but wake ups, just return the task_cpu */
if (sd_flag != SD_BALANCE_WAKE && sd_flag != SD_BALANCE_FORK)
goto out;
/* Only try algorithms three times */
#define RT_MAX_TRIES 3
-static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep);
-
static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
{
if (!task_running(rq, p) &&
pull_rt_task(rq);
}
-static inline void init_sched_rt_class(void)
+void init_sched_rt_class(void)
{
unsigned int i;
- for_each_possible_cpu(i)
+ for_each_possible_cpu(i) {
zalloc_cpumask_var_node(&per_cpu(local_cpu_mask, i),
GFP_KERNEL, cpu_to_node(i));
+ }
}
#endif /* CONFIG_SMP */
return 0;
}
-static const struct sched_class rt_sched_class = {
+const struct sched_class rt_sched_class = {
.next = &fair_sched_class,
.enqueue_task = enqueue_task_rt,
.dequeue_task = dequeue_task_rt,
#ifdef CONFIG_SCHED_DEBUG
extern void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq);
-static void print_rt_stats(struct seq_file *m, int cpu)
+void print_rt_stats(struct seq_file *m, int cpu)
{
rt_rq_iter_t iter;
struct rt_rq *rt_rq;
--- /dev/null
+
+#include <linux/sched.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/stop_machine.h>
+
+#include "cpupri.h"
+
+extern __read_mostly int scheduler_running;
+
+/*
+ * Convert user-nice values [ -20 ... 0 ... 19 ]
+ * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
+ * and back.
+ */
+#define NICE_TO_PRIO(nice) (MAX_RT_PRIO + (nice) + 20)
+#define PRIO_TO_NICE(prio) ((prio) - MAX_RT_PRIO - 20)
+#define TASK_NICE(p) PRIO_TO_NICE((p)->static_prio)
+
+/*
+ * 'User priority' is the nice value converted to something we
+ * can work with better when scaling various scheduler parameters,
+ * it's a [ 0 ... 39 ] range.
+ */
+#define USER_PRIO(p) ((p)-MAX_RT_PRIO)
+#define TASK_USER_PRIO(p) USER_PRIO((p)->static_prio)
+#define MAX_USER_PRIO (USER_PRIO(MAX_PRIO))
+
+/*
+ * Helpers for converting nanosecond timing to jiffy resolution
+ */
+#define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ))
+
+#define NICE_0_LOAD SCHED_LOAD_SCALE
+#define NICE_0_SHIFT SCHED_LOAD_SHIFT
+
+/*
+ * These are the 'tuning knobs' of the scheduler:
+ *
+ * default timeslice is 100 msecs (used only for SCHED_RR tasks).
+ * Timeslices get refilled after they expire.
+ */
+#define DEF_TIMESLICE (100 * HZ / 1000)
+
+/*
+ * single value that denotes runtime == period, ie unlimited time.
+ */
+#define RUNTIME_INF ((u64)~0ULL)
+
+static inline int rt_policy(int policy)
+{
+ if (policy == SCHED_FIFO || policy == SCHED_RR)
+ return 1;
+ return 0;
+}
+
+static inline int task_has_rt_policy(struct task_struct *p)
+{
+ return rt_policy(p->policy);
+}
+
+/*
+ * This is the priority-queue data structure of the RT scheduling class:
+ */
+struct rt_prio_array {
+ DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */
+ struct list_head queue[MAX_RT_PRIO];
+};
+
+struct rt_bandwidth {
+ /* nests inside the rq lock: */
+ raw_spinlock_t rt_runtime_lock;
+ ktime_t rt_period;
+ u64 rt_runtime;
+ struct hrtimer rt_period_timer;
+};
+
+extern struct mutex sched_domains_mutex;
+
+#ifdef CONFIG_CGROUP_SCHED
+
+#include <linux/cgroup.h>
+
+struct cfs_rq;
+struct rt_rq;
+
+static LIST_HEAD(task_groups);
+
+struct cfs_bandwidth {
+#ifdef CONFIG_CFS_BANDWIDTH
+ raw_spinlock_t lock;
+ ktime_t period;
+ u64 quota, runtime;
+ s64 hierarchal_quota;
+ u64 runtime_expires;
+
+ int idle, timer_active;
+ struct hrtimer period_timer, slack_timer;
+ struct list_head throttled_cfs_rq;
+
+ /* statistics */
+ int nr_periods, nr_throttled;
+ u64 throttled_time;
+#endif
+};
+
+/* task group related information */
+struct task_group {
+ struct cgroup_subsys_state css;
+
+#ifdef CONFIG_FAIR_GROUP_SCHED
+ /* schedulable entities of this group on each cpu */
+ struct sched_entity **se;
+ /* runqueue "owned" by this group on each cpu */
+ struct cfs_rq **cfs_rq;
+ unsigned long shares;
+
+ atomic_t load_weight;
+#endif
+
+#ifdef CONFIG_RT_GROUP_SCHED
+ struct sched_rt_entity **rt_se;
+ struct rt_rq **rt_rq;
+
+ struct rt_bandwidth rt_bandwidth;
+#endif
+
+ struct rcu_head rcu;
+ struct list_head list;
+
+ struct task_group *parent;
+ struct list_head siblings;
+ struct list_head children;
+
+#ifdef CONFIG_SCHED_AUTOGROUP
+ struct autogroup *autogroup;
+#endif
+
+ struct cfs_bandwidth cfs_bandwidth;
+};
+
+#ifdef CONFIG_FAIR_GROUP_SCHED
+#define ROOT_TASK_GROUP_LOAD NICE_0_LOAD
+
+/*
+ * A weight of 0 or 1 can cause arithmetics problems.
+ * A weight of a cfs_rq is the sum of weights of which entities
+ * are queued on this cfs_rq, so a weight of a entity should not be
+ * too large, so as the shares value of a task group.
+ * (The default weight is 1024 - so there's no practical
+ * limitation from this.)
+ */
+#define MIN_SHARES (1UL << 1)
+#define MAX_SHARES (1UL << 18)
+#endif
+
+/* Default task group.
+ * Every task in system belong to this group at bootup.
+ */
+extern struct task_group root_task_group;
+
+typedef int (*tg_visitor)(struct task_group *, void *);
+
+extern int walk_tg_tree_from(struct task_group *from,
+ tg_visitor down, tg_visitor up, void *data);
+
+/*
+ * Iterate the full tree, calling @down when first entering a node and @up when
+ * leaving it for the final time.
+ *
+ * Caller must hold rcu_lock or sufficient equivalent.
+ */
+static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data)
+{
+ return walk_tg_tree_from(&root_task_group, down, up, data);
+}
+
+extern int tg_nop(struct task_group *tg, void *data);
+
+extern void free_fair_sched_group(struct task_group *tg);
+extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent);
+extern void unregister_fair_sched_group(struct task_group *tg, int cpu);
+extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
+ struct sched_entity *se, int cpu,
+ struct sched_entity *parent);
+extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b);
+extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
+
+extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b);
+extern void __start_cfs_bandwidth(struct cfs_bandwidth *cfs_b);
+extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq);
+
+extern void free_rt_sched_group(struct task_group *tg);
+extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent);
+extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
+ struct sched_rt_entity *rt_se, int cpu,
+ struct sched_rt_entity *parent);
+
+#else /* CONFIG_CGROUP_SCHED */
+
+struct cfs_bandwidth { };
+
+#endif /* CONFIG_CGROUP_SCHED */
+
+/* CFS-related fields in a runqueue */
+struct cfs_rq {
+ struct load_weight load;
+ unsigned long nr_running, h_nr_running;
+
+ u64 exec_clock;
+ u64 min_vruntime;
+#ifndef CONFIG_64BIT
+ u64 min_vruntime_copy;
+#endif
+
+ struct rb_root tasks_timeline;
+ struct rb_node *rb_leftmost;
+
+ struct list_head tasks;
+ struct list_head *balance_iterator;
+
+ /*
+ * 'curr' points to currently running entity on this cfs_rq.
+ * It is set to NULL otherwise (i.e when none are currently running).
+ */
+ struct sched_entity *curr, *next, *last, *skip;
+
+#ifdef CONFIG_SCHED_DEBUG
+ unsigned int nr_spread_over;
+#endif
+
+#ifdef CONFIG_FAIR_GROUP_SCHED
+ struct rq *rq; /* cpu runqueue to which this cfs_rq is attached */
+
+ /*
+ * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in
+ * a hierarchy). Non-leaf lrqs hold other higher schedulable entities
+ * (like users, containers etc.)
+ *
+ * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a cpu. This
+ * list is used during load balance.
+ */
+ int on_list;
+ struct list_head leaf_cfs_rq_list;
+ struct task_group *tg; /* group that "owns" this runqueue */
+
+#ifdef CONFIG_SMP
+ /*
+ * the part of load.weight contributed by tasks
+ */
+ unsigned long task_weight;
+
+ /*
+ * h_load = weight * f(tg)
+ *
+ * Where f(tg) is the recursive weight fraction assigned to
+ * this group.
+ */
+ unsigned long h_load;
+
+ /*
+ * Maintaining per-cpu shares distribution for group scheduling
+ *
+ * load_stamp is the last time we updated the load average
+ * load_last is the last time we updated the load average and saw load
+ * load_unacc_exec_time is currently unaccounted execution time
+ */
+ u64 load_avg;
+ u64 load_period;
+ u64 load_stamp, load_last, load_unacc_exec_time;
+
+ unsigned long load_contribution;
+#endif /* CONFIG_SMP */
+#ifdef CONFIG_CFS_BANDWIDTH
+ int runtime_enabled;
+ u64 runtime_expires;
+ s64 runtime_remaining;
+
+ u64 throttled_timestamp;
+ int throttled, throttle_count;
+ struct list_head throttled_list;
+#endif /* CONFIG_CFS_BANDWIDTH */
+#endif /* CONFIG_FAIR_GROUP_SCHED */
+};
+
+static inline int rt_bandwidth_enabled(void)
+{
+ return sysctl_sched_rt_runtime >= 0;
+}
+
+/* Real-Time classes' related field in a runqueue: */
+struct rt_rq {
+ struct rt_prio_array active;
+ unsigned long rt_nr_running;
+#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
+ struct {
+ int curr; /* highest queued rt task prio */
+#ifdef CONFIG_SMP
+ int next; /* next highest */
+#endif
+ } highest_prio;
+#endif
+#ifdef CONFIG_SMP
+ unsigned long rt_nr_migratory;
+ unsigned long rt_nr_total;
+ int overloaded;
+ struct plist_head pushable_tasks;
+#endif
+ int rt_throttled;
+ u64 rt_time;
+ u64 rt_runtime;
+ /* Nests inside the rq lock: */
+ raw_spinlock_t rt_runtime_lock;
+
+#ifdef CONFIG_RT_GROUP_SCHED
+ unsigned long rt_nr_boosted;
+
+ struct rq *rq;
+ struct list_head leaf_rt_rq_list;
+ struct task_group *tg;
+#endif
+};
+
+#ifdef CONFIG_SMP
+
+/*
+ * We add the notion of a root-domain which will be used to define per-domain
+ * variables. Each exclusive cpuset essentially defines an island domain by
+ * fully partitioning the member cpus from any other cpuset. Whenever a new
+ * exclusive cpuset is created, we also create and attach a new root-domain
+ * object.
+ *
+ */
+struct root_domain {
+ atomic_t refcount;
+ atomic_t rto_count;
+ struct rcu_head rcu;
+ cpumask_var_t span;
+ cpumask_var_t online;
+
+ /*
+ * The "RT overload" flag: it gets set if a CPU has more than
+ * one runnable RT task.
+ */
+ cpumask_var_t rto_mask;
+ struct cpupri cpupri;
+};
+
+extern struct root_domain def_root_domain;
+
+#endif /* CONFIG_SMP */
+
+/*
+ * This is the main, per-CPU runqueue data structure.
+ *
+ * Locking rule: those places that want to lock multiple runqueues
+ * (such as the load balancing or the thread migration code), lock
+ * acquire operations must be ordered by ascending &runqueue.
+ */
+struct rq {
+ /* runqueue lock: */
+ raw_spinlock_t lock;
+
+ /*
+ * nr_running and cpu_load should be in the same cacheline because
+ * remote CPUs use both these fields when doing load calculation.
+ */
+ unsigned long nr_running;
+ #define CPU_LOAD_IDX_MAX 5
+ unsigned long cpu_load[CPU_LOAD_IDX_MAX];
+ unsigned long last_load_update_tick;
+#ifdef CONFIG_NO_HZ
+ u64 nohz_stamp;
+ unsigned long nohz_flags;
+#endif
+ int skip_clock_update;
+
+ /* capture load from *all* tasks on this cpu: */
+ struct load_weight load;
+ unsigned long nr_load_updates;
+ u64 nr_switches;
+
+ struct cfs_rq cfs;
+ struct rt_rq rt;
+
+#ifdef CONFIG_FAIR_GROUP_SCHED
+ /* list of leaf cfs_rq on this cpu: */
+ struct list_head leaf_cfs_rq_list;
+#endif
+#ifdef CONFIG_RT_GROUP_SCHED
+ struct list_head leaf_rt_rq_list;
+#endif
+
+ /*
+ * This is part of a global counter where only the total sum
+ * over all CPUs matters. A task can increase this counter on
+ * one CPU and if it got migrated afterwards it may decrease
+ * it on another CPU. Always updated under the runqueue lock:
+ */
+ unsigned long nr_uninterruptible;
+
+ struct task_struct *curr, *idle, *stop;
+ unsigned long next_balance;
+ struct mm_struct *prev_mm;
+
+ u64 clock;
+ u64 clock_task;
+
+ atomic_t nr_iowait;
+
+#ifdef CONFIG_SMP
+ struct root_domain *rd;
+ struct sched_domain *sd;
+
+ unsigned long cpu_power;
+
+ unsigned char idle_balance;
+ /* For active balancing */
+ int post_schedule;
+ int active_balance;
+ int push_cpu;
+ struct cpu_stop_work active_balance_work;
+ /* cpu of this runqueue: */
+ int cpu;
+ int online;
+
+ u64 rt_avg;
+ u64 age_stamp;
+ u64 idle_stamp;
+ u64 avg_idle;
+#endif
+
+#ifdef CONFIG_IRQ_TIME_ACCOUNTING
+ u64 prev_irq_time;
+#endif
+#ifdef CONFIG_PARAVIRT
+ u64 prev_steal_time;
+#endif
+#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
+ u64 prev_steal_time_rq;
+#endif
+
+ /* calc_load related fields */
+ unsigned long calc_load_update;
+ long calc_load_active;
+
+#ifdef CONFIG_SCHED_HRTICK
+#ifdef CONFIG_SMP
+ int hrtick_csd_pending;
+ struct call_single_data hrtick_csd;
+#endif
+ struct hrtimer hrtick_timer;
+#endif
+
+#ifdef CONFIG_SCHEDSTATS
+ /* latency stats */
+ struct sched_info rq_sched_info;
+ unsigned long long rq_cpu_time;
+ /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */
+
+ /* sys_sched_yield() stats */
+ unsigned int yld_count;
+
+ /* schedule() stats */
+ unsigned int sched_switch;
+ unsigned int sched_count;
+ unsigned int sched_goidle;
+
+ /* try_to_wake_up() stats */
+ unsigned int ttwu_count;
+ unsigned int ttwu_local;
+#endif
+
+#ifdef CONFIG_SMP
+ struct llist_head wake_list;
+#endif
+};
+
+static inline int cpu_of(struct rq *rq)
+{
+#ifdef CONFIG_SMP
+ return rq->cpu;
+#else
+ return 0;
+#endif
+}
+
+DECLARE_PER_CPU(struct rq, runqueues);
+
+#define cpu_rq(cpu) (&per_cpu(runqueues, (cpu)))
+#define this_rq() (&__get_cpu_var(runqueues))
+#define task_rq(p) cpu_rq(task_cpu(p))
+#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
+#define raw_rq() (&__raw_get_cpu_var(runqueues))
+
+#ifdef CONFIG_SMP
+
+#define rcu_dereference_check_sched_domain(p) \
+ rcu_dereference_check((p), \
+ lockdep_is_held(&sched_domains_mutex))
+
+/*
+ * The domain tree (rq->sd) is protected by RCU's quiescent state transition.
+ * See detach_destroy_domains: synchronize_sched for details.
+ *
+ * The domain tree of any CPU may only be accessed from within
+ * preempt-disabled sections.
+ */
+#define for_each_domain(cpu, __sd) \
+ for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \
+ __sd; __sd = __sd->parent)
+
+#define for_each_lower_domain(sd) for (; sd; sd = sd->child)
+
+/**
+ * highest_flag_domain - Return highest sched_domain containing flag.
+ * @cpu: The cpu whose highest level of sched domain is to
+ * be returned.
+ * @flag: The flag to check for the highest sched_domain
+ * for the given cpu.
+ *
+ * Returns the highest sched_domain of a cpu which contains the given flag.
+ */
+static inline struct sched_domain *highest_flag_domain(int cpu, int flag)
+{
+ struct sched_domain *sd, *hsd = NULL;
+
+ for_each_domain(cpu, sd) {
+ if (!(sd->flags & flag))
+ break;
+ hsd = sd;
+ }
+
+ return hsd;
+}
+
+DECLARE_PER_CPU(struct sched_domain *, sd_llc);
+DECLARE_PER_CPU(int, sd_llc_id);
+
+#endif /* CONFIG_SMP */
+
+#include "stats.h"
+#include "auto_group.h"
+
+#ifdef CONFIG_CGROUP_SCHED
+
+/*
+ * Return the group to which this tasks belongs.
+ *
+ * We use task_subsys_state_check() and extend the RCU verification with
+ * pi->lock and rq->lock because cpu_cgroup_attach() holds those locks for each
+ * task it moves into the cgroup. Therefore by holding either of those locks,
+ * we pin the task to the current cgroup.
+ */
+static inline struct task_group *task_group(struct task_struct *p)
+{
+ struct task_group *tg;
+ struct cgroup_subsys_state *css;
+
+ css = task_subsys_state_check(p, cpu_cgroup_subsys_id,
+ lockdep_is_held(&p->pi_lock) ||
+ lockdep_is_held(&task_rq(p)->lock));
+ tg = container_of(css, struct task_group, css);
+
+ return autogroup_task_group(p, tg);
+}
+
+/* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
+static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
+{
+#if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED)
+ struct task_group *tg = task_group(p);
+#endif
+
+#ifdef CONFIG_FAIR_GROUP_SCHED
+ p->se.cfs_rq = tg->cfs_rq[cpu];
+ p->se.parent = tg->se[cpu];
+#endif
+
+#ifdef CONFIG_RT_GROUP_SCHED
+ p->rt.rt_rq = tg->rt_rq[cpu];
+ p->rt.parent = tg->rt_se[cpu];
+#endif
+}
+
+#else /* CONFIG_CGROUP_SCHED */
+
+static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
+static inline struct task_group *task_group(struct task_struct *p)
+{
+ return NULL;
+}
+
+#endif /* CONFIG_CGROUP_SCHED */
+
+static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
+{
+ set_task_rq(p, cpu);
+#ifdef CONFIG_SMP
+ /*
+ * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be
+ * successfuly executed on another CPU. We must ensure that updates of
+ * per-task data have been completed by this moment.
+ */
+ smp_wmb();
+ task_thread_info(p)->cpu = cpu;
+#endif
+}
+
+/*
+ * Tunables that become constants when CONFIG_SCHED_DEBUG is off:
+ */
+#ifdef CONFIG_SCHED_DEBUG
+# include <linux/jump_label.h>
+# define const_debug __read_mostly
+#else
+# define const_debug const
+#endif
+
+extern const_debug unsigned int sysctl_sched_features;
+
+#define SCHED_FEAT(name, enabled) \
+ __SCHED_FEAT_##name ,
+
+enum {
+#include "features.h"
+ __SCHED_FEAT_NR,
+};
+
+#undef SCHED_FEAT
+
+#if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL)
+static __always_inline bool static_branch__true(struct jump_label_key *key)
+{
+ return likely(static_branch(key)); /* Not out of line branch. */
+}
+
+static __always_inline bool static_branch__false(struct jump_label_key *key)
+{
+ return unlikely(static_branch(key)); /* Out of line branch. */
+}
+
+#define SCHED_FEAT(name, enabled) \
+static __always_inline bool static_branch_##name(struct jump_label_key *key) \
+{ \
+ return static_branch__##enabled(key); \
+}
+
+#include "features.h"
+
+#undef SCHED_FEAT
+
+extern struct jump_label_key sched_feat_keys[__SCHED_FEAT_NR];
+#define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x]))
+#else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */
+#define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
+#endif /* SCHED_DEBUG && HAVE_JUMP_LABEL */
+
+static inline u64 global_rt_period(void)
+{
+ return (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
+}
+
+static inline u64 global_rt_runtime(void)
+{
+ if (sysctl_sched_rt_runtime < 0)
+ return RUNTIME_INF;
+
+ return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC;
+}
+
+
+
+static inline int task_current(struct rq *rq, struct task_struct *p)
+{
+ return rq->curr == p;
+}
+
+static inline int task_running(struct rq *rq, struct task_struct *p)
+{
+#ifdef CONFIG_SMP
+ return p->on_cpu;
+#else
+ return task_current(rq, p);
+#endif
+}
+
+
+#ifndef prepare_arch_switch
+# define prepare_arch_switch(next) do { } while (0)
+#endif
+#ifndef finish_arch_switch
+# define finish_arch_switch(prev) do { } while (0)
+#endif
+
+#ifndef __ARCH_WANT_UNLOCKED_CTXSW
+static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next)
+{
+#ifdef CONFIG_SMP
+ /*
+ * We can optimise this out completely for !SMP, because the
+ * SMP rebalancing from interrupt is the only thing that cares
+ * here.
+ */
+ next->on_cpu = 1;
+#endif
+}
+
+static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
+{
+#ifdef CONFIG_SMP
+ /*
+ * After ->on_cpu is cleared, the task can be moved to a different CPU.
+ * We must ensure this doesn't happen until the switch is completely
+ * finished.
+ */
+ smp_wmb();
+ prev->on_cpu = 0;
+#endif
+#ifdef CONFIG_DEBUG_SPINLOCK
+ /* this is a valid case when another task releases the spinlock */
+ rq->lock.owner = current;
+#endif
+ /*
+ * If we are tracking spinlock dependencies then we have to
+ * fix up the runqueue lock - which gets 'carried over' from
+ * prev into current:
+ */
+ spin_acquire(&rq->lock.dep_map, 0, 0, _THIS_IP_);
+
+ raw_spin_unlock_irq(&rq->lock);
+}
+
+#else /* __ARCH_WANT_UNLOCKED_CTXSW */
+static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next)
+{
+#ifdef CONFIG_SMP
+ /*
+ * We can optimise this out completely for !SMP, because the
+ * SMP rebalancing from interrupt is the only thing that cares
+ * here.
+ */
+ next->on_cpu = 1;
+#endif
+#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
+ raw_spin_unlock_irq(&rq->lock);
+#else
+ raw_spin_unlock(&rq->lock);
+#endif
+}
+
+static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
+{
+#ifdef CONFIG_SMP
+ /*
+ * After ->on_cpu is cleared, the task can be moved to a different CPU.
+ * We must ensure this doesn't happen until the switch is completely
+ * finished.
+ */
+ smp_wmb();
+ prev->on_cpu = 0;
+#endif
+#ifndef __ARCH_WANT_INTERRUPTS_ON_CTXSW
+ local_irq_enable();
+#endif
+}
+#endif /* __ARCH_WANT_UNLOCKED_CTXSW */
+
+
+static inline void update_load_add(struct load_weight *lw, unsigned long inc)
+{
+ lw->weight += inc;
+ lw->inv_weight = 0;
+}
+
+static inline void update_load_sub(struct load_weight *lw, unsigned long dec)
+{
+ lw->weight -= dec;
+ lw->inv_weight = 0;
+}
+
+static inline void update_load_set(struct load_weight *lw, unsigned long w)
+{
+ lw->weight = w;
+ lw->inv_weight = 0;
+}
+
+/*
+ * To aid in avoiding the subversion of "niceness" due to uneven distribution
+ * of tasks with abnormal "nice" values across CPUs the contribution that
+ * each task makes to its run queue's load is weighted according to its
+ * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a
+ * scaled version of the new time slice allocation that they receive on time
+ * slice expiry etc.
+ */
+
+#define WEIGHT_IDLEPRIO 3
+#define WMULT_IDLEPRIO 1431655765
+
+/*
+ * Nice levels are multiplicative, with a gentle 10% change for every
+ * nice level changed. I.e. when a CPU-bound task goes from nice 0 to
+ * nice 1, it will get ~10% less CPU time than another CPU-bound task
+ * that remained on nice 0.
+ *
+ * The "10% effect" is relative and cumulative: from _any_ nice level,
+ * if you go up 1 level, it's -10% CPU usage, if you go down 1 level
+ * it's +10% CPU usage. (to achieve that we use a multiplier of 1.25.
+ * If a task goes up by ~10% and another task goes down by ~10% then
+ * the relative distance between them is ~25%.)
+ */
+static const int prio_to_weight[40] = {
+ /* -20 */ 88761, 71755, 56483, 46273, 36291,
+ /* -15 */ 29154, 23254, 18705, 14949, 11916,
+ /* -10 */ 9548, 7620, 6100, 4904, 3906,
+ /* -5 */ 3121, 2501, 1991, 1586, 1277,
+ /* 0 */ 1024, 820, 655, 526, 423,
+ /* 5 */ 335, 272, 215, 172, 137,
+ /* 10 */ 110, 87, 70, 56, 45,
+ /* 15 */ 36, 29, 23, 18, 15,
+};
+
+/*
+ * Inverse (2^32/x) values of the prio_to_weight[] array, precalculated.
+ *
+ * In cases where the weight does not change often, we can use the
+ * precalculated inverse to speed up arithmetics by turning divisions
+ * into multiplications:
+ */
+static const u32 prio_to_wmult[40] = {
+ /* -20 */ 48388, 59856, 76040, 92818, 118348,
+ /* -15 */ 147320, 184698, 229616, 287308, 360437,
+ /* -10 */ 449829, 563644, 704093, 875809, 1099582,
+ /* -5 */ 1376151, 1717300, 2157191, 2708050, 3363326,
+ /* 0 */ 4194304, 5237765, 6557202, 8165337, 10153587,
+ /* 5 */ 12820798, 15790321, 19976592, 24970740, 31350126,
+ /* 10 */ 39045157, 49367440, 61356676, 76695844, 95443717,
+ /* 15 */ 119304647, 148102320, 186737708, 238609294, 286331153,
+};
+
+/* Time spent by the tasks of the cpu accounting group executing in ... */
+enum cpuacct_stat_index {
+ CPUACCT_STAT_USER, /* ... user mode */
+ CPUACCT_STAT_SYSTEM, /* ... kernel mode */
+
+ CPUACCT_STAT_NSTATS,
+};
+
+
+#define sched_class_highest (&stop_sched_class)
+#define for_each_class(class) \
+ for (class = sched_class_highest; class; class = class->next)
+
+extern const struct sched_class stop_sched_class;
+extern const struct sched_class rt_sched_class;
+extern const struct sched_class fair_sched_class;
+extern const struct sched_class idle_sched_class;
+
+
+#ifdef CONFIG_SMP
+
+extern void trigger_load_balance(struct rq *rq, int cpu);
+extern void idle_balance(int this_cpu, struct rq *this_rq);
+
+#else /* CONFIG_SMP */
+
+static inline void idle_balance(int cpu, struct rq *rq)
+{
+}
+
+#endif
+
+extern void sysrq_sched_debug_show(void);
+extern void sched_init_granularity(void);
+extern void update_max_interval(void);
+extern void update_group_power(struct sched_domain *sd, int cpu);
+extern int update_runtime(struct notifier_block *nfb, unsigned long action, void *hcpu);
+extern void init_sched_rt_class(void);
+extern void init_sched_fair_class(void);
+
+extern void resched_task(struct task_struct *p);
+extern void resched_cpu(int cpu);
+
+extern struct rt_bandwidth def_rt_bandwidth;
+extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime);
+
+extern void update_cpu_load(struct rq *this_rq);
+
+#ifdef CONFIG_CGROUP_CPUACCT
+#include <linux/cgroup.h>
+/* track cpu usage of a group of tasks and its child groups */
+struct cpuacct {
+ struct cgroup_subsys_state css;
+ /* cpuusage holds pointer to a u64-type object on every cpu */
+ u64 __percpu *cpuusage;
+ struct kernel_cpustat __percpu *cpustat;
+};
+
+/* return cpu accounting group corresponding to this container */
+static inline struct cpuacct *cgroup_ca(struct cgroup *cgrp)
+{
+ return container_of(cgroup_subsys_state(cgrp, cpuacct_subsys_id),
+ struct cpuacct, css);
+}
+
+/* return cpu accounting group to which this task belongs */
+static inline struct cpuacct *task_ca(struct task_struct *tsk)
+{
+ return container_of(task_subsys_state(tsk, cpuacct_subsys_id),
+ struct cpuacct, css);
+}
+
+static inline struct cpuacct *parent_ca(struct cpuacct *ca)
+{
+ if (!ca || !ca->css.cgroup->parent)
+ return NULL;
+ return cgroup_ca(ca->css.cgroup->parent);
+}
+
+extern void cpuacct_charge(struct task_struct *tsk, u64 cputime);
+#else
+static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {}
+#endif
+
+static inline void inc_nr_running(struct rq *rq)
+{
+ rq->nr_running++;
+}
+
+static inline void dec_nr_running(struct rq *rq)
+{
+ rq->nr_running--;
+}
+
+extern void update_rq_clock(struct rq *rq);
+
+extern void activate_task(struct rq *rq, struct task_struct *p, int flags);
+extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags);
+
+extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags);
+
+extern const_debug unsigned int sysctl_sched_time_avg;
+extern const_debug unsigned int sysctl_sched_nr_migrate;
+extern const_debug unsigned int sysctl_sched_migration_cost;
+
+static inline u64 sched_avg_period(void)
+{
+ return (u64)sysctl_sched_time_avg * NSEC_PER_MSEC / 2;
+}
+
+void calc_load_account_idle(struct rq *this_rq);
+
+#ifdef CONFIG_SCHED_HRTICK
+
+/*
+ * Use hrtick when:
+ * - enabled by features
+ * - hrtimer is actually high res
+ */
+static inline int hrtick_enabled(struct rq *rq)
+{
+ if (!sched_feat(HRTICK))
+ return 0;
+ if (!cpu_active(cpu_of(rq)))
+ return 0;
+ return hrtimer_is_hres_active(&rq->hrtick_timer);
+}
+
+void hrtick_start(struct rq *rq, u64 delay);
+
+#else
+
+static inline int hrtick_enabled(struct rq *rq)
+{
+ return 0;
+}
+
+#endif /* CONFIG_SCHED_HRTICK */
+
+#ifdef CONFIG_SMP
+extern void sched_avg_update(struct rq *rq);
+static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta)
+{
+ rq->rt_avg += rt_delta;
+ sched_avg_update(rq);
+}
+#else
+static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { }
+static inline void sched_avg_update(struct rq *rq) { }
+#endif
+
+extern void start_bandwidth_timer(struct hrtimer *period_timer, ktime_t period);
+
+#ifdef CONFIG_SMP
+#ifdef CONFIG_PREEMPT
+
+static inline void double_rq_lock(struct rq *rq1, struct rq *rq2);
+
+/*
+ * fair double_lock_balance: Safely acquires both rq->locks in a fair
+ * way at the expense of forcing extra atomic operations in all
+ * invocations. This assures that the double_lock is acquired using the
+ * same underlying policy as the spinlock_t on this architecture, which
+ * reduces latency compared to the unfair variant below. However, it
+ * also adds more overhead and therefore may reduce throughput.
+ */
+static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
+ __releases(this_rq->lock)
+ __acquires(busiest->lock)
+ __acquires(this_rq->lock)
+{
+ raw_spin_unlock(&this_rq->lock);
+ double_rq_lock(this_rq, busiest);
+
+ return 1;
+}
+
+#else
+/*
+ * Unfair double_lock_balance: Optimizes throughput at the expense of
+ * latency by eliminating extra atomic operations when the locks are
+ * already in proper order on entry. This favors lower cpu-ids and will
+ * grant the double lock to lower cpus over higher ids under contention,
+ * regardless of entry order into the function.
+ */
+static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
+ __releases(this_rq->lock)
+ __acquires(busiest->lock)
+ __acquires(this_rq->lock)
+{
+ int ret = 0;
+
+ if (unlikely(!raw_spin_trylock(&busiest->lock))) {
+ if (busiest < this_rq) {
+ raw_spin_unlock(&this_rq->lock);
+ raw_spin_lock(&busiest->lock);
+ raw_spin_lock_nested(&this_rq->lock,
+ SINGLE_DEPTH_NESTING);
+ ret = 1;
+ } else
+ raw_spin_lock_nested(&busiest->lock,
+ SINGLE_DEPTH_NESTING);
+ }
+ return ret;
+}
+
+#endif /* CONFIG_PREEMPT */
+
+/*
+ * double_lock_balance - lock the busiest runqueue, this_rq is locked already.
+ */
+static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest)
+{
+ if (unlikely(!irqs_disabled())) {
+ /* printk() doesn't work good under rq->lock */
+ raw_spin_unlock(&this_rq->lock);
+ BUG_ON(1);
+ }
+
+ return _double_lock_balance(this_rq, busiest);
+}
+
+static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
+ __releases(busiest->lock)
+{
+ raw_spin_unlock(&busiest->lock);
+ lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
+}
+
+/*
+ * double_rq_lock - safely lock two runqueues
+ *
+ * Note this does not disable interrupts like task_rq_lock,
+ * you need to do so manually before calling.
+ */
+static inline void double_rq_lock(struct rq *rq1, struct rq *rq2)
+ __acquires(rq1->lock)
+ __acquires(rq2->lock)
+{
+ BUG_ON(!irqs_disabled());
+ if (rq1 == rq2) {
+ raw_spin_lock(&rq1->lock);
+ __acquire(rq2->lock); /* Fake it out ;) */
+ } else {
+ if (rq1 < rq2) {
+ raw_spin_lock(&rq1->lock);
+ raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING);
+ } else {
+ raw_spin_lock(&rq2->lock);
+ raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING);
+ }
+ }
+}
+
+/*
+ * double_rq_unlock - safely unlock two runqueues
+ *
+ * Note this does not restore interrupts like task_rq_unlock,
+ * you need to do so manually after calling.
+ */
+static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2)
+ __releases(rq1->lock)
+ __releases(rq2->lock)
+{
+ raw_spin_unlock(&rq1->lock);
+ if (rq1 != rq2)
+ raw_spin_unlock(&rq2->lock);
+ else
+ __release(rq2->lock);
+}
+
+#else /* CONFIG_SMP */
+
+/*
+ * double_rq_lock - safely lock two runqueues
+ *
+ * Note this does not disable interrupts like task_rq_lock,
+ * you need to do so manually before calling.
+ */
+static inline void double_rq_lock(struct rq *rq1, struct rq *rq2)
+ __acquires(rq1->lock)
+ __acquires(rq2->lock)
+{
+ BUG_ON(!irqs_disabled());
+ BUG_ON(rq1 != rq2);
+ raw_spin_lock(&rq1->lock);
+ __acquire(rq2->lock); /* Fake it out ;) */
+}
+
+/*
+ * double_rq_unlock - safely unlock two runqueues
+ *
+ * Note this does not restore interrupts like task_rq_unlock,
+ * you need to do so manually after calling.
+ */
+static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2)
+ __releases(rq1->lock)
+ __releases(rq2->lock)
+{
+ BUG_ON(rq1 != rq2);
+ raw_spin_unlock(&rq1->lock);
+ __release(rq2->lock);
+}
+
+#endif
+
+extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq);
+extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq);
+extern void print_cfs_stats(struct seq_file *m, int cpu);
+extern void print_rt_stats(struct seq_file *m, int cpu);
+
+extern void init_cfs_rq(struct cfs_rq *cfs_rq);
+extern void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq);
+extern void unthrottle_offline_cfs_rqs(struct rq *rq);
+
+extern void account_cfs_bandwidth_used(int enabled, int was_enabled);
+
+#ifdef CONFIG_NO_HZ
+enum rq_nohz_flag_bits {
+ NOHZ_TICK_STOPPED,
+ NOHZ_BALANCE_KICK,
+ NOHZ_IDLE,
+};
+
+#define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags)
+#endif
--- /dev/null
+
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+
+#include "sched.h"
+
+/*
+ * bump this up when changing the output format or the meaning of an existing
+ * format, so that tools can adapt (or abort)
+ */
+#define SCHEDSTAT_VERSION 15
+
+static int show_schedstat(struct seq_file *seq, void *v)
+{
+ int cpu;
+ int mask_len = DIV_ROUND_UP(NR_CPUS, 32) * 9;
+ char *mask_str = kmalloc(mask_len, GFP_KERNEL);
+
+ if (mask_str == NULL)
+ return -ENOMEM;
+
+ seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
+ seq_printf(seq, "timestamp %lu\n", jiffies);
+ for_each_online_cpu(cpu) {
+ struct rq *rq = cpu_rq(cpu);
+#ifdef CONFIG_SMP
+ struct sched_domain *sd;
+ int dcount = 0;
+#endif
+
+ /* runqueue-specific stats */
+ seq_printf(seq,
+ "cpu%d %u %u %u %u %u %u %llu %llu %lu",
+ cpu, rq->yld_count,
+ rq->sched_switch, rq->sched_count, rq->sched_goidle,
+ rq->ttwu_count, rq->ttwu_local,
+ rq->rq_cpu_time,
+ rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
+
+ seq_printf(seq, "\n");
+
+#ifdef CONFIG_SMP
+ /* domain-specific stats */
+ rcu_read_lock();
+ for_each_domain(cpu, sd) {
+ enum cpu_idle_type itype;
+
+ cpumask_scnprintf(mask_str, mask_len,
+ sched_domain_span(sd));
+ seq_printf(seq, "domain%d %s", dcount++, mask_str);
+ for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
+ itype++) {
+ seq_printf(seq, " %u %u %u %u %u %u %u %u",
+ sd->lb_count[itype],
+ sd->lb_balanced[itype],
+ sd->lb_failed[itype],
+ sd->lb_imbalance[itype],
+ sd->lb_gained[itype],
+ sd->lb_hot_gained[itype],
+ sd->lb_nobusyq[itype],
+ sd->lb_nobusyg[itype]);
+ }
+ seq_printf(seq,
+ " %u %u %u %u %u %u %u %u %u %u %u %u\n",
+ sd->alb_count, sd->alb_failed, sd->alb_pushed,
+ sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,
+ sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,
+ sd->ttwu_wake_remote, sd->ttwu_move_affine,
+ sd->ttwu_move_balance);
+ }
+ rcu_read_unlock();
+#endif
+ }
+ kfree(mask_str);
+ return 0;
+}
+
+static int schedstat_open(struct inode *inode, struct file *file)
+{
+ unsigned int size = PAGE_SIZE * (1 + num_online_cpus() / 32);
+ char *buf = kmalloc(size, GFP_KERNEL);
+ struct seq_file *m;
+ int res;
+
+ if (!buf)
+ return -ENOMEM;
+ res = single_open(file, show_schedstat, NULL);
+ if (!res) {
+ m = file->private_data;
+ m->buf = buf;
+ m->size = size;
+ } else
+ kfree(buf);
+ return res;
+}
+
+static const struct file_operations proc_schedstat_operations = {
+ .open = schedstat_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init proc_schedstat_init(void)
+{
+ proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
+ return 0;
+}
+module_init(proc_schedstat_init);
#ifdef CONFIG_SCHEDSTATS
-/*
- * bump this up when changing the output format or the meaning of an existing
- * format, so that tools can adapt (or abort)
- */
-#define SCHEDSTAT_VERSION 15
-
-static int show_schedstat(struct seq_file *seq, void *v)
-{
- int cpu;
- int mask_len = DIV_ROUND_UP(NR_CPUS, 32) * 9;
- char *mask_str = kmalloc(mask_len, GFP_KERNEL);
-
- if (mask_str == NULL)
- return -ENOMEM;
-
- seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
- seq_printf(seq, "timestamp %lu\n", jiffies);
- for_each_online_cpu(cpu) {
- struct rq *rq = cpu_rq(cpu);
-#ifdef CONFIG_SMP
- struct sched_domain *sd;
- int dcount = 0;
-#endif
-
- /* runqueue-specific stats */
- seq_printf(seq,
- "cpu%d %u %u %u %u %u %u %llu %llu %lu",
- cpu, rq->yld_count,
- rq->sched_switch, rq->sched_count, rq->sched_goidle,
- rq->ttwu_count, rq->ttwu_local,
- rq->rq_cpu_time,
- rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
-
- seq_printf(seq, "\n");
-
-#ifdef CONFIG_SMP
- /* domain-specific stats */
- rcu_read_lock();
- for_each_domain(cpu, sd) {
- enum cpu_idle_type itype;
-
- cpumask_scnprintf(mask_str, mask_len,
- sched_domain_span(sd));
- seq_printf(seq, "domain%d %s", dcount++, mask_str);
- for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;
- itype++) {
- seq_printf(seq, " %u %u %u %u %u %u %u %u",
- sd->lb_count[itype],
- sd->lb_balanced[itype],
- sd->lb_failed[itype],
- sd->lb_imbalance[itype],
- sd->lb_gained[itype],
- sd->lb_hot_gained[itype],
- sd->lb_nobusyq[itype],
- sd->lb_nobusyg[itype]);
- }
- seq_printf(seq,
- " %u %u %u %u %u %u %u %u %u %u %u %u\n",
- sd->alb_count, sd->alb_failed, sd->alb_pushed,
- sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,
- sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,
- sd->ttwu_wake_remote, sd->ttwu_move_affine,
- sd->ttwu_move_balance);
- }
- rcu_read_unlock();
-#endif
- }
- kfree(mask_str);
- return 0;
-}
-
-static int schedstat_open(struct inode *inode, struct file *file)
-{
- unsigned int size = PAGE_SIZE * (1 + num_online_cpus() / 32);
- char *buf = kmalloc(size, GFP_KERNEL);
- struct seq_file *m;
- int res;
-
- if (!buf)
- return -ENOMEM;
- res = single_open(file, show_schedstat, NULL);
- if (!res) {
- m = file->private_data;
- m->buf = buf;
- m->size = size;
- } else
- kfree(buf);
- return res;
-}
-
-static const struct file_operations proc_schedstat_operations = {
- .open = schedstat_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int __init proc_schedstat_init(void)
-{
- proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
- return 0;
-}
-module_init(proc_schedstat_init);
/*
* Expects runqueue lock to be held for atomicity of update
return;
raw_spin_lock(&cputimer->lock);
- cputimer->cputime.utime =
- cputime_add(cputimer->cputime.utime, cputime);
+ cputimer->cputime.utime += cputime;
raw_spin_unlock(&cputimer->lock);
}
return;
raw_spin_lock(&cputimer->lock);
- cputimer->cputime.stime =
- cputime_add(cputimer->cputime.stime, cputime);
+ cputimer->cputime.stime += cputime;
raw_spin_unlock(&cputimer->lock);
}
+#include "sched.h"
+
/*
* stop-task scheduling class.
*
/*
* Simple, special scheduling class for the per-CPU stop tasks:
*/
-static const struct sched_class stop_sched_class = {
+const struct sched_class stop_sched_class = {
.next = &rt_sched_class,
.enqueue_task = enqueue_task_stop,
info.si_uid = __task_cred(tsk)->uid;
rcu_read_unlock();
- info.si_utime = cputime_to_clock_t(cputime_add(tsk->utime,
- tsk->signal->utime));
- info.si_stime = cputime_to_clock_t(cputime_add(tsk->stime,
- tsk->signal->stime));
+ info.si_utime = cputime_to_clock_t(tsk->utime + tsk->signal->utime);
+ info.si_stime = cputime_to_clock_t(tsk->stime + tsk->signal->stime);
info.si_status = tsk->exit_code & 0x7f;
if (tsk->exit_code & 0x80)
unsigned long maxrss = 0;
memset((char *) r, 0, sizeof *r);
- utime = stime = cputime_zero;
+ utime = stime = 0;
if (who == RUSAGE_THREAD) {
task_times(current, &utime, &stime);
case RUSAGE_SELF:
thread_group_times(p, &tgutime, &tgstime);
- utime = cputime_add(utime, tgutime);
- stime = cputime_add(stime, tgstime);
+ utime += tgutime;
+ stime += tgstime;
r->ru_nvcsw += p->signal->nvcsw;
r->ru_nivcsw += p->signal->nivcsw;
r->ru_minflt += p->signal->min_flt;
WARN_ON_ONCE(irqs_disabled());
+ /*
+ * Update the idle state in the scheduler domain hierarchy
+ * when tick_nohz_stop_sched_tick() is called from the idle loop.
+ * State will be updated to busy during the first busy tick after
+ * exiting idle.
+ */
+ set_cpu_sd_state_idle();
+
local_irq_disable();
ts = &__get_cpu_var(tick_cpu_sched);
local_irq_save(flags);
time = tsk->stime + tsk->utime;
- dtime = cputime_sub(time, tsk->acct_timexpd);
+ dtime = time - tsk->acct_timexpd;
jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
delta = value.tv_sec;
delta = delta * USEC_PER_SEC + value.tv_usec;
projects / platform / adaptation / renesas_rcar / renesas_kernel.git / commitdiff