tsacct: Convert obsolete cputime type to nsecs

Use the new nsec based cputime accessors as part of the whole cputime
conversion from cputime_t to nsecs.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Link: http://lkml.kernel.org/r/1485832191-26889-15-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 75fc773..dc44366 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1815,7 +1815,7 @@ struct task_struct {
 #if defined(CONFIG_TASK_XACCT)
        u64 acct_rss_mem1;      /* accumulated rss usage */
        u64 acct_vm_mem1;       /* accumulated virtual memory usage */
-       cputime_t acct_timexpd; /* stime + utime since last update */
+       u64 acct_timexpd;       /* stime + utime since last update */
 #endif
 #ifdef CONFIG_CPUSETS
        nodemask_t mems_allowed;        /* Protected by alloc_lock */

diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 040d0a6..5c21f05 100644 (file)
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -31,7 +31,7 @@ void bacct_add_tsk(struct user_namespace *user_ns,
                   struct taskstats *stats, struct task_struct *tsk)
 {
        const struct cred *tcred;
-       cputime_t utime, stime, utimescaled, stimescaled;
+       u64 utime, stime, utimescaled, stimescaled;
        u64 delta;
 
        BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
@@ -66,13 +66,13 @@ void bacct_add_tsk(struct user_namespace *user_ns,
                task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
        rcu_read_unlock();
 
-       task_cputime_t(tsk, &utime, &stime);
-       stats->ac_utime = cputime_to_usecs(utime);
-       stats->ac_stime = cputime_to_usecs(stime);
+       task_cputime(tsk, &utime, &stime);
+       stats->ac_utime = div_u64(utime, NSEC_PER_USEC);
+       stats->ac_stime = div_u64(stime, NSEC_PER_USEC);
 
-       task_cputime_t_scaled(tsk, &utimescaled, &stimescaled);
-       stats->ac_utimescaled = cputime_to_usecs(utimescaled);
-       stats->ac_stimescaled = cputime_to_usecs(stimescaled);
+       task_cputime_scaled(tsk, &utimescaled, &stimescaled);
+       stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC);
+       stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC);
 
        stats->ac_minflt = tsk->min_flt;
        stats->ac_majflt = tsk->maj_flt;
@@ -123,18 +123,15 @@ void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
 #undef MB
 
 static void __acct_update_integrals(struct task_struct *tsk,
-                                   cputime_t utime, cputime_t stime)
+                                   u64 utime, u64 stime)
 {
-       cputime_t time, dtime;
-       u64 delta;
+       u64 time, delta;
 
        if (!likely(tsk->mm))
                return;
 
        time = stime + utime;
-       dtime = time - tsk->acct_timexpd;
-       /* Avoid division: cputime_t is often in nanoseconds already. */
-       delta = cputime_to_nsecs(dtime);
+       delta = time - tsk->acct_timexpd;
 
        if (delta < TICK_NSEC)
                return;
@@ -155,11 +152,11 @@ static void __acct_update_integrals(struct task_struct *tsk,
  */
 void acct_update_integrals(struct task_struct *tsk)
 {
-       cputime_t utime, stime;
+       u64 utime, stime;
        unsigned long flags;
 
        local_irq_save(flags);
-       task_cputime_t(tsk, &utime, &stime);
+       task_cputime(tsk, &utime, &stime);
        __acct_update_integrals(tsk, utime, stime);
        local_irq_restore(flags);
 }