#ifndef _LINUX_SCHED_H
#define _LINUX_SCHED_H
-#include <uapi/linux/sched.h>
+/*
+ * Define 'struct task_struct' and provide the main scheduler
+ * APIs (schedule(), wakeup variants, etc.)
+ */
-#include <linux/sched/prio.h>
-#include <linux/nodemask.h>
+#include <uapi/linux/sched.h>
-#include <linux/mutex.h>
-#include <linux/plist.h>
-#include <linux/mm_types_task.h>
+#include <asm/current.h>
+#include <linux/pid.h>
#include <linux/sem.h>
#include <linux/shm.h>
-#include <linux/signal_types.h>
-#include <linux/pid.h>
+#include <linux/kcov.h>
+#include <linux/mutex.h>
+#include <linux/plist.h>
+#include <linux/hrtimer.h>
#include <linux/seccomp.h>
+#include <linux/nodemask.h>
#include <linux/rcupdate.h>
-
#include <linux/resource.h>
-#include <linux/hrtimer.h>
-#include <linux/kcov.h>
-#include <linux/task_io_accounting.h>
#include <linux/latencytop.h>
+#include <linux/sched/prio.h>
+#include <linux/signal_types.h>
+#include <linux/mm_types_task.h>
+#include <linux/task_io_accounting.h>
-#include <asm/current.h>
-
-/* task_struct member predeclarations: */
+/* task_struct member predeclarations (sorted alphabetically): */
struct audit_context;
-struct autogroup;
struct backing_dev_info;
struct bio_list;
struct blk_plug;
struct cfs_rq;
-struct filename;
struct fs_struct;
struct futex_pi_state;
struct io_context;
struct signal_struct;
struct task_delay_info;
struct task_group;
-struct task_struct;
-struct uts_namespace;
/*
* Task state bitmask. NOTE! These bits are also
* modifying one set can't modify the other one by
* mistake.
*/
-#define TASK_RUNNING 0
-#define TASK_INTERRUPTIBLE 1
-#define TASK_UNINTERRUPTIBLE 2
-#define __TASK_STOPPED 4
-#define __TASK_TRACED 8
-/* in tsk->exit_state */
-#define EXIT_DEAD 16
-#define EXIT_ZOMBIE 32
-#define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
-/* in tsk->state again */
-#define TASK_DEAD 64
-#define TASK_WAKEKILL 128
-#define TASK_WAKING 256
-#define TASK_PARKED 512
-#define TASK_NOLOAD 1024
-#define TASK_NEW 2048
-#define TASK_STATE_MAX 4096
-
-#define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPNn"
-
-/* Convenience macros for the sake of set_current_state */
-#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
-#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
-#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
-
-#define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD)
-
-/* Convenience macros for the sake of wake_up */
-#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
-#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
-
-/* get_task_state() */
-#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
- TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
- __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD)
-
-#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
-#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
-#define task_is_stopped_or_traced(task) \
- ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
-#define task_contributes_to_load(task) \
- ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
- (task->flags & PF_FROZEN) == 0 && \
- (task->state & TASK_NOLOAD) == 0)
+
+/* Used in tsk->state: */
+#define TASK_RUNNING 0
+#define TASK_INTERRUPTIBLE 1
+#define TASK_UNINTERRUPTIBLE 2
+#define __TASK_STOPPED 4
+#define __TASK_TRACED 8
+/* Used in tsk->exit_state: */
+#define EXIT_DEAD 16
+#define EXIT_ZOMBIE 32
+#define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
+/* Used in tsk->state again: */
+#define TASK_DEAD 64
+#define TASK_WAKEKILL 128
+#define TASK_WAKING 256
+#define TASK_PARKED 512
+#define TASK_NOLOAD 1024
+#define TASK_NEW 2048
+#define TASK_STATE_MAX 4096
+
+#define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPNn"
+
+/* Convenience macros for the sake of set_current_state: */
+#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
+#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
+#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
+
+#define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD)
+
+/* Convenience macros for the sake of wake_up(): */
+#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
+#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
+
+/* get_task_state(): */
+#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
+ TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
+ __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD)
+
+#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
+
+#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
+
+#define task_is_stopped_or_traced(task) ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
+
+#define task_contributes_to_load(task) ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
+ (task->flags & PF_FROZEN) == 0 && \
+ (task->state & TASK_NOLOAD) == 0)
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
*
* Also see the comments of try_to_wake_up().
*/
-#define __set_current_state(state_value) \
- do { current->state = (state_value); } while (0)
-#define set_current_state(state_value) \
- smp_store_mb(current->state, (state_value))
-
+#define __set_current_state(state_value) do { current->state = (state_value); } while (0)
+#define set_current_state(state_value) smp_store_mb(current->state, (state_value))
#endif
-/* Task command name length */
-#define TASK_COMM_LEN 16
+/* Task command name length: */
+#define TASK_COMM_LEN 16
-extern cpumask_var_t cpu_isolated_map;
+extern cpumask_var_t cpu_isolated_map;
extern void scheduler_tick(void);
-#define MAX_SCHEDULE_TIMEOUT LONG_MAX
-extern signed long schedule_timeout(signed long timeout);
-extern signed long schedule_timeout_interruptible(signed long timeout);
-extern signed long schedule_timeout_killable(signed long timeout);
-extern signed long schedule_timeout_uninterruptible(signed long timeout);
-extern signed long schedule_timeout_idle(signed long timeout);
+#define MAX_SCHEDULE_TIMEOUT LONG_MAX
+
+extern long schedule_timeout(long timeout);
+extern long schedule_timeout_interruptible(long timeout);
+extern long schedule_timeout_killable(long timeout);
+extern long schedule_timeout_uninterruptible(long timeout);
+extern long schedule_timeout_idle(long timeout);
asmlinkage void schedule(void);
extern void schedule_preempt_disabled(void);
*/
struct prev_cputime {
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
- u64 utime;
- u64 stime;
- raw_spinlock_t lock;
+ u64 utime;
+ u64 stime;
+ raw_spinlock_t lock;
#endif
};
* these counts together and treat all three of them in parallel.
*/
struct task_cputime {
- u64 utime;
- u64 stime;
- unsigned long long sum_exec_runtime;
+ u64 utime;
+ u64 stime;
+ unsigned long long sum_exec_runtime;
};
-/* Alternate field names when used to cache expirations. */
-#define virt_exp utime
-#define prof_exp stime
-#define sched_exp sum_exec_runtime
+/* Alternate field names when used on cache expirations: */
+#define virt_exp utime
+#define prof_exp stime
+#define sched_exp sum_exec_runtime
struct sched_info {
#ifdef CONFIG_SCHED_INFO
- /* cumulative counters */
- unsigned long pcount; /* # of times run on this cpu */
- unsigned long long run_delay; /* time spent waiting on a runqueue */
+ /* Cumulative counters: */
+
+ /* # of times we have run on this CPU: */
+ unsigned long pcount;
+
+ /* Time spent waiting on a runqueue: */
+ unsigned long long run_delay;
+
+ /* Timestamps: */
+
+ /* When did we last run on a CPU? */
+ unsigned long long last_arrival;
+
+ /* When were we last queued to run? */
+ unsigned long long last_queued;
- /* timestamps */
- unsigned long long last_arrival,/* when we last ran on a cpu */
- last_queued; /* when we were last queued to run */
#endif /* CONFIG_SCHED_INFO */
};
* We define a basic fixed point arithmetic range, and then formalize
* all these metrics based on that basic range.
*/
-# define SCHED_FIXEDPOINT_SHIFT 10
-# define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT)
+# define SCHED_FIXEDPOINT_SHIFT 10
+# define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT)
struct load_weight {
- unsigned long weight;
- u32 inv_weight;
+ unsigned long weight;
+ u32 inv_weight;
};
/*
* issues.
*/
struct sched_avg {
- u64 last_update_time, load_sum;
- u32 util_sum, period_contrib;
- unsigned long load_avg, util_avg;
+ u64 last_update_time;
+ u64 load_sum;
+ u32 util_sum;
+ u32 period_contrib;
+ unsigned long load_avg;
+ unsigned long util_avg;
};
struct sched_statistics {
#ifdef CONFIG_SCHEDSTATS
- u64 wait_start;
- u64 wait_max;
- u64 wait_count;
- u64 wait_sum;
- u64 iowait_count;
- u64 iowait_sum;
-
- u64 sleep_start;
- u64 sleep_max;
- s64 sum_sleep_runtime;
-
- u64 block_start;
- u64 block_max;
- u64 exec_max;
- u64 slice_max;
-
- u64 nr_migrations_cold;
- u64 nr_failed_migrations_affine;
- u64 nr_failed_migrations_running;
- u64 nr_failed_migrations_hot;
- u64 nr_forced_migrations;
-
- u64 nr_wakeups;
- u64 nr_wakeups_sync;
- u64 nr_wakeups_migrate;
- u64 nr_wakeups_local;
- u64 nr_wakeups_remote;
- u64 nr_wakeups_affine;
- u64 nr_wakeups_affine_attempts;
- u64 nr_wakeups_passive;
- u64 nr_wakeups_idle;
+ u64 wait_start;
+ u64 wait_max;
+ u64 wait_count;
+ u64 wait_sum;
+ u64 iowait_count;
+ u64 iowait_sum;
+
+ u64 sleep_start;
+ u64 sleep_max;
+ s64 sum_sleep_runtime;
+
+ u64 block_start;
+ u64 block_max;
+ u64 exec_max;
+ u64 slice_max;
+
+ u64 nr_migrations_cold;
+ u64 nr_failed_migrations_affine;
+ u64 nr_failed_migrations_running;
+ u64 nr_failed_migrations_hot;
+ u64 nr_forced_migrations;
+
+ u64 nr_wakeups;
+ u64 nr_wakeups_sync;
+ u64 nr_wakeups_migrate;
+ u64 nr_wakeups_local;
+ u64 nr_wakeups_remote;
+ u64 nr_wakeups_affine;
+ u64 nr_wakeups_affine_attempts;
+ u64 nr_wakeups_passive;
+ u64 nr_wakeups_idle;
#endif
};
struct sched_entity {
- struct load_weight load; /* for load-balancing */
- struct rb_node run_node;
- struct list_head group_node;
- unsigned int on_rq;
+ /* For load-balancing: */
+ struct load_weight load;
+ struct rb_node run_node;
+ struct list_head group_node;
+ unsigned int on_rq;
- u64 exec_start;
- u64 sum_exec_runtime;
- u64 vruntime;
- u64 prev_sum_exec_runtime;
+ u64 exec_start;
+ u64 sum_exec_runtime;
+ u64 vruntime;
+ u64 prev_sum_exec_runtime;
- u64 nr_migrations;
+ u64 nr_migrations;
- struct sched_statistics statistics;
+ struct sched_statistics statistics;
#ifdef CONFIG_FAIR_GROUP_SCHED
- int depth;
- struct sched_entity *parent;
+ int depth;
+ struct sched_entity *parent;
/* rq on which this entity is (to be) queued: */
- struct cfs_rq *cfs_rq;
+ struct cfs_rq *cfs_rq;
/* rq "owned" by this entity/group: */
- struct cfs_rq *my_q;
+ struct cfs_rq *my_q;
#endif
#ifdef CONFIG_SMP
* Put into separate cache line so it does not
* collide with read-mostly values above.
*/
- struct sched_avg avg ____cacheline_aligned_in_smp;
+ struct sched_avg avg ____cacheline_aligned_in_smp;
#endif
};
struct sched_rt_entity {
- struct list_head run_list;
- unsigned long timeout;
- unsigned long watchdog_stamp;
- unsigned int time_slice;
- unsigned short on_rq;
- unsigned short on_list;
-
- struct sched_rt_entity *back;
+ struct list_head run_list;
+ unsigned long timeout;
+ unsigned long watchdog_stamp;
+ unsigned int time_slice;
+ unsigned short on_rq;
+ unsigned short on_list;
+
+ struct sched_rt_entity *back;
#ifdef CONFIG_RT_GROUP_SCHED
- struct sched_rt_entity *parent;
+ struct sched_rt_entity *parent;
/* rq on which this entity is (to be) queued: */
- struct rt_rq *rt_rq;
+ struct rt_rq *rt_rq;
/* rq "owned" by this entity/group: */
- struct rt_rq *my_q;
+ struct rt_rq *my_q;
#endif
};
struct sched_dl_entity {
- struct rb_node rb_node;
+ struct rb_node rb_node;
/*
* Original scheduling parameters. Copied here from sched_attr
* during sched_setattr(), they will remain the same until
* the next sched_setattr().
*/
- u64 dl_runtime; /* maximum runtime for each instance */
- u64 dl_deadline; /* relative deadline of each instance */
- u64 dl_period; /* separation of two instances (period) */
- u64 dl_bw; /* dl_runtime / dl_deadline */
+ u64 dl_runtime; /* Maximum runtime for each instance */
+ u64 dl_deadline; /* Relative deadline of each instance */
+ u64 dl_period; /* Separation of two instances (period) */
+ u64 dl_bw; /* dl_runtime / dl_deadline */
/*
* Actual scheduling parameters. Initialized with the values above,
* they are continously updated during task execution. Note that
* the remaining runtime could be < 0 in case we are in overrun.
*/
- s64 runtime; /* remaining runtime for this instance */
- u64 deadline; /* absolute deadline for this instance */
- unsigned int flags; /* specifying the scheduler behaviour */
+ s64 runtime; /* Remaining runtime for this instance */
+ u64 deadline; /* Absolute deadline for this instance */
+ unsigned int flags; /* Specifying the scheduler behaviour */
/*
* Some bool flags:
* outside bandwidth enforcement mechanism (but only until we
* exit the critical section);
*
- * @dl_yielded tells if task gave up the cpu before consuming
+ * @dl_yielded tells if task gave up the CPU before consuming
* all its available runtime during the last job.
*/
- int dl_throttled, dl_boosted, dl_yielded;
+ int dl_throttled;
+ int dl_boosted;
+ int dl_yielded;
/*
* Bandwidth enforcement timer. Each -deadline task has its
* own bandwidth to be enforced, thus we need one timer per task.
*/
- struct hrtimer dl_timer;
+ struct hrtimer dl_timer;
};
union rcu_special {
struct {
- u8 blocked;
- u8 need_qs;
- u8 exp_need_qs;
- u8 pad; /* Otherwise the compiler can store garbage here. */
+ u8 blocked;
+ u8 need_qs;
+ u8 exp_need_qs;
+
+ /* Otherwise the compiler can store garbage here: */
+ u8 pad;
} b; /* Bits. */
u32 s; /* Set of bits. */
};
* For reasons of header soup (see current_thread_info()), this
* must be the first element of task_struct.
*/
- struct thread_info thread_info;
+ struct thread_info thread_info;
#endif
- volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
- void *stack;
- atomic_t usage;
- unsigned int flags; /* per process flags, defined below */
- unsigned int ptrace;
+ /* -1 unrunnable, 0 runnable, >0 stopped: */
+ volatile long state;
+ void *stack;
+ atomic_t usage;
+ /* Per task flags (PF_*), defined further below: */
+ unsigned int flags;
+ unsigned int ptrace;
#ifdef CONFIG_SMP
- struct llist_node wake_entry;
- int on_cpu;
+ struct llist_node wake_entry;
+ int on_cpu;
#ifdef CONFIG_THREAD_INFO_IN_TASK
- unsigned int cpu; /* current CPU */
+ /* Current CPU: */
+ unsigned int cpu;
#endif
- unsigned int wakee_flips;
- unsigned long wakee_flip_decay_ts;
- struct task_struct *last_wakee;
+ unsigned int wakee_flips;
+ unsigned long wakee_flip_decay_ts;
+ struct task_struct *last_wakee;
- int wake_cpu;
+ int wake_cpu;
#endif
- int on_rq;
+ int on_rq;
+
+ int prio;
+ int static_prio;
+ int normal_prio;
+ unsigned int rt_priority;
- int prio, static_prio, normal_prio;
- unsigned int rt_priority;
- const struct sched_class *sched_class;
- struct sched_entity se;
- struct sched_rt_entity rt;
+ const struct sched_class *sched_class;
+ struct sched_entity se;
+ struct sched_rt_entity rt;
#ifdef CONFIG_CGROUP_SCHED
- struct task_group *sched_task_group;
+ struct task_group *sched_task_group;
#endif
- struct sched_dl_entity dl;
+ struct sched_dl_entity dl;
#ifdef CONFIG_PREEMPT_NOTIFIERS
- /* list of struct preempt_notifier: */
- struct hlist_head preempt_notifiers;
+ /* List of struct preempt_notifier: */
+ struct hlist_head preempt_notifiers;
#endif
#ifdef CONFIG_BLK_DEV_IO_TRACE
- unsigned int btrace_seq;
+ unsigned int btrace_seq;
#endif
- unsigned int policy;
- int nr_cpus_allowed;
- cpumask_t cpus_allowed;
+ unsigned int policy;
+ int nr_cpus_allowed;
+ cpumask_t cpus_allowed;
#ifdef CONFIG_PREEMPT_RCU
- int rcu_read_lock_nesting;
- union rcu_special rcu_read_unlock_special;
- struct list_head rcu_node_entry;
- struct rcu_node *rcu_blocked_node;
+ int rcu_read_lock_nesting;
+ union rcu_special rcu_read_unlock_special;
+ struct list_head rcu_node_entry;
+ struct rcu_node *rcu_blocked_node;
#endif /* #ifdef CONFIG_PREEMPT_RCU */
+
#ifdef CONFIG_TASKS_RCU
- unsigned long rcu_tasks_nvcsw;
- bool rcu_tasks_holdout;
- struct list_head rcu_tasks_holdout_list;
- int rcu_tasks_idle_cpu;
+ unsigned long rcu_tasks_nvcsw;
+ bool rcu_tasks_holdout;
+ struct list_head rcu_tasks_holdout_list;
+ int rcu_tasks_idle_cpu;
#endif /* #ifdef CONFIG_TASKS_RCU */
- struct sched_info sched_info;
+ struct sched_info sched_info;
- struct list_head tasks;
+ struct list_head tasks;
#ifdef CONFIG_SMP
- struct plist_node pushable_tasks;
- struct rb_node pushable_dl_tasks;
+ struct plist_node pushable_tasks;
+ struct rb_node pushable_dl_tasks;
#endif
- struct mm_struct *mm, *active_mm;
+ struct mm_struct *mm;
+ struct mm_struct *active_mm;
/* Per-thread vma caching: */
- struct vmacache vmacache;
-
-#if defined(SPLIT_RSS_COUNTING)
- struct task_rss_stat rss_stat;
-#endif
-/* task state */
- int exit_state;
- int exit_code, exit_signal;
- int pdeath_signal; /* The signal sent when the parent dies */
- unsigned long jobctl; /* JOBCTL_*, siglock protected */
-
- /* Used for emulating ABI behavior of previous Linux versions */
- unsigned int personality;
-
- /* scheduler bits, serialized by scheduler locks */
- unsigned sched_reset_on_fork:1;
- unsigned sched_contributes_to_load:1;
- unsigned sched_migrated:1;
- unsigned sched_remote_wakeup:1;
- unsigned :0; /* force alignment to the next boundary */
-
- /* unserialized, strictly 'current' */
- unsigned in_execve:1; /* bit to tell LSMs we're in execve */
- unsigned in_iowait:1;
-#if !defined(TIF_RESTORE_SIGMASK)
- unsigned restore_sigmask:1;
+ struct vmacache vmacache;
+
+#ifdef SPLIT_RSS_COUNTING
+ struct task_rss_stat rss_stat;
+#endif
+ int exit_state;
+ int exit_code;
+ int exit_signal;
+ /* The signal sent when the parent dies: */
+ int pdeath_signal;
+ /* JOBCTL_*, siglock protected: */
+ unsigned long jobctl;
+
+ /* Used for emulating ABI behavior of previous Linux versions: */
+ unsigned int personality;
+
+ /* Scheduler bits, serialized by scheduler locks: */
+ unsigned sched_reset_on_fork:1;
+ unsigned sched_contributes_to_load:1;
+ unsigned sched_migrated:1;
+ unsigned sched_remote_wakeup:1;
+ /* Force alignment to the next boundary: */
+ unsigned :0;
+
+ /* Unserialized, strictly 'current' */
+
+ /* Bit to tell LSMs we're in execve(): */
+ unsigned in_execve:1;
+ unsigned in_iowait:1;
+#ifndef TIF_RESTORE_SIGMASK
+ unsigned restore_sigmask:1;
#endif
#ifdef CONFIG_MEMCG
- unsigned memcg_may_oom:1;
+ unsigned memcg_may_oom:1;
#ifndef CONFIG_SLOB
- unsigned memcg_kmem_skip_account:1;
+ unsigned memcg_kmem_skip_account:1;
#endif
#endif
#ifdef CONFIG_COMPAT_BRK
- unsigned brk_randomized:1;
+ unsigned brk_randomized:1;
#endif
- unsigned long atomic_flags; /* Flags needing atomic access. */
+ unsigned long atomic_flags; /* Flags requiring atomic access. */
- struct restart_block restart_block;
+ struct restart_block restart_block;
- pid_t pid;
- pid_t tgid;
+ pid_t pid;
+ pid_t tgid;
#ifdef CONFIG_CC_STACKPROTECTOR
- /* Canary value for the -fstack-protector gcc feature */
- unsigned long stack_canary;
+ /* Canary value for the -fstack-protector GCC feature: */
+ unsigned long stack_canary;
#endif
/*
- * pointers to (original) parent process, youngest child, younger sibling,
+ * Pointers to the (original) parent process, youngest child, younger sibling,
* older sibling, respectively. (p->father can be replaced with
* p->real_parent->pid)
*/
- struct task_struct __rcu *real_parent; /* real parent process */
- struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
+
+ /* Real parent process: */
+ struct task_struct __rcu *real_parent;
+
+ /* Recipient of SIGCHLD, wait4() reports: */
+ struct task_struct __rcu *parent;
+
/*
- * children/sibling forms the list of my natural children
+ * Children/sibling form the list of natural children:
*/
- struct list_head children; /* list of my children */
- struct list_head sibling; /* linkage in my parent's children list */
- struct task_struct *group_leader; /* threadgroup leader */
+ struct list_head children;
+ struct list_head sibling;
+ struct task_struct *group_leader;
/*
- * ptraced is the list of tasks this task is using ptrace on.
+ * 'ptraced' is the list of tasks this task is using ptrace() on.
+ *
* This includes both natural children and PTRACE_ATTACH targets.
- * p->ptrace_entry is p's link on the p->parent->ptraced list.
+ * 'ptrace_entry' is this task's link on the p->parent->ptraced list.
*/
- struct list_head ptraced;
- struct list_head ptrace_entry;
+ struct list_head ptraced;
+ struct list_head ptrace_entry;
/* PID/PID hash table linkage. */
- struct pid_link pids[PIDTYPE_MAX];
- struct list_head thread_group;
- struct list_head thread_node;
+ struct pid_link pids[PIDTYPE_MAX];
+ struct list_head thread_group;
+ struct list_head thread_node;
+
+ struct completion *vfork_done;
- struct completion *vfork_done; /* for vfork() */
- int __user *set_child_tid; /* CLONE_CHILD_SETTID */
- int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
+ /* CLONE_CHILD_SETTID: */
+ int __user *set_child_tid;
- u64 utime, stime;
+ /* CLONE_CHILD_CLEARTID: */
+ int __user *clear_child_tid;
+
+ u64 utime;
+ u64 stime;
#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
- u64 utimescaled, stimescaled;
+ u64 utimescaled;
+ u64 stimescaled;
#endif
- u64 gtime;
- struct prev_cputime prev_cputime;
+ u64 gtime;
+ struct prev_cputime prev_cputime;
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
- seqcount_t vtime_seqcount;
- unsigned long long vtime_snap;
+ seqcount_t vtime_seqcount;
+ unsigned long long vtime_snap;
enum {
- /* Task is sleeping or running in a CPU with VTIME inactive */
+ /* Task is sleeping or running in a CPU with VTIME inactive: */
VTIME_INACTIVE = 0,
- /* Task runs in userspace in a CPU with VTIME active */
+ /* Task runs in userspace in a CPU with VTIME active: */
VTIME_USER,
- /* Task runs in kernelspace in a CPU with VTIME active */
+ /* Task runs in kernelspace in a CPU with VTIME active: */
VTIME_SYS,
} vtime_snap_whence;
#endif
#ifdef CONFIG_NO_HZ_FULL
- atomic_t tick_dep_mask;
+ atomic_t tick_dep_mask;
#endif
- unsigned long nvcsw, nivcsw; /* context switch counts */
- u64 start_time; /* monotonic time in nsec */
- u64 real_start_time; /* boot based time in nsec */
-/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
- unsigned long min_flt, maj_flt;
+ /* Context switch counts: */
+ unsigned long nvcsw;
+ unsigned long nivcsw;
+
+ /* Monotonic time in nsecs: */
+ u64 start_time;
+
+ /* Boot based time in nsecs: */
+ u64 real_start_time;
+
+ /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */
+ unsigned long min_flt;
+ unsigned long maj_flt;
#ifdef CONFIG_POSIX_TIMERS
- struct task_cputime cputime_expires;
- struct list_head cpu_timers[3];
-#endif
-
-/* process credentials */
- const struct cred __rcu *ptracer_cred; /* Tracer's credentials at attach */
- const struct cred __rcu *real_cred; /* objective and real subjective task
- * credentials (COW) */
- const struct cred __rcu *cred; /* effective (overridable) subjective task
- * credentials (COW) */
- char comm[TASK_COMM_LEN]; /* executable name excluding path
- - access with [gs]et_task_comm (which lock
- it with task_lock())
- - initialized normally by setup_new_exec */
-/* file system info */
- struct nameidata *nameidata;
+ struct task_cputime cputime_expires;
+ struct list_head cpu_timers[3];
+#endif
+
+ /* Process credentials: */
+
+ /* Tracer's credentials at attach: */
+ const struct cred __rcu *ptracer_cred;
+
+ /* Objective and real subjective task credentials (COW): */
+ const struct cred __rcu *real_cred;
+
+ /* Effective (overridable) subjective task credentials (COW): */
+ const struct cred __rcu *cred;
+
+ /*
+ * executable name, excluding path.
+ *
+ * - normally initialized setup_new_exec()
+ * - access it with [gs]et_task_comm()
+ * - lock it with task_lock()
+ */
+ char comm[TASK_COMM_LEN];
+
+ struct nameidata *nameidata;
+
#ifdef CONFIG_SYSVIPC
-/* ipc stuff */
- struct sysv_sem sysvsem;
- struct sysv_shm sysvshm;
+ struct sysv_sem sysvsem;
+ struct sysv_shm sysvshm;
#endif
#ifdef CONFIG_DETECT_HUNG_TASK
-/* hung task detection */
- unsigned long last_switch_count;
-#endif
-/* filesystem information */
- struct fs_struct *fs;
-/* open file information */
- struct files_struct *files;
-/* namespaces */
- struct nsproxy *nsproxy;
-/* signal handlers */
- struct signal_struct *signal;
- struct sighand_struct *sighand;
-
- sigset_t blocked, real_blocked;
- sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
- struct sigpending pending;
-
- unsigned long sas_ss_sp;
- size_t sas_ss_size;
- unsigned sas_ss_flags;
-
- struct callback_head *task_works;
-
- struct audit_context *audit_context;
+ unsigned long last_switch_count;
+#endif
+ /* Filesystem information: */
+ struct fs_struct *fs;
+
+ /* Open file information: */
+ struct files_struct *files;
+
+ /* Namespaces: */
+ struct nsproxy *nsproxy;
+
+ /* Signal handlers: */
+ struct signal_struct *signal;
+ struct sighand_struct *sighand;
+ sigset_t blocked;
+ sigset_t real_blocked;
+ /* Restored if set_restore_sigmask() was used: */
+ sigset_t saved_sigmask;
+ struct sigpending pending;
+ unsigned long sas_ss_sp;
+ size_t sas_ss_size;
+ unsigned int sas_ss_flags;
+
+ struct callback_head *task_works;
+
+ struct audit_context *audit_context;
#ifdef CONFIG_AUDITSYSCALL
- kuid_t loginuid;
- unsigned int sessionid;
+ kuid_t loginuid;
+ unsigned int sessionid;
#endif
- struct seccomp seccomp;
+ struct seccomp seccomp;
-/* Thread group tracking */
- u32 parent_exec_id;
- u32 self_exec_id;
-/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
- * mempolicy */
- spinlock_t alloc_lock;
+ /* Thread group tracking: */
+ u32 parent_exec_id;
+ u32 self_exec_id;
+
+ /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */
+ spinlock_t alloc_lock;
/* Protection of the PI data structures: */
- raw_spinlock_t pi_lock;
+ raw_spinlock_t pi_lock;
- struct wake_q_node wake_q;
+ struct wake_q_node wake_q;
#ifdef CONFIG_RT_MUTEXES
- /* PI waiters blocked on a rt_mutex held by this task */
- struct rb_root pi_waiters;
- struct rb_node *pi_waiters_leftmost;
- /* Deadlock detection and priority inheritance handling */
- struct rt_mutex_waiter *pi_blocked_on;
+ /* PI waiters blocked on a rt_mutex held by this task: */
+ struct rb_root pi_waiters;
+ struct rb_node *pi_waiters_leftmost;
+ /* Deadlock detection and priority inheritance handling: */
+ struct rt_mutex_waiter *pi_blocked_on;
#endif
#ifdef CONFIG_DEBUG_MUTEXES
- /* mutex deadlock detection */
- struct mutex_waiter *blocked_on;
+ /* Mutex deadlock detection: */
+ struct mutex_waiter *blocked_on;
#endif
+
#ifdef CONFIG_TRACE_IRQFLAGS
- unsigned int irq_events;
- unsigned long hardirq_enable_ip;
- unsigned long hardirq_disable_ip;
- unsigned int hardirq_enable_event;
- unsigned int hardirq_disable_event;
- int hardirqs_enabled;
- int hardirq_context;
- unsigned long softirq_disable_ip;
- unsigned long softirq_enable_ip;
- unsigned int softirq_disable_event;
- unsigned int softirq_enable_event;
- int softirqs_enabled;
- int softirq_context;
+ unsigned int irq_events;
+ unsigned long hardirq_enable_ip;
+ unsigned long hardirq_disable_ip;
+ unsigned int hardirq_enable_event;
+ unsigned int hardirq_disable_event;
+ int hardirqs_enabled;
+ int hardirq_context;
+ unsigned long softirq_disable_ip;
+ unsigned long softirq_enable_ip;
+ unsigned int softirq_disable_event;
+ unsigned int softirq_enable_event;
+ int softirqs_enabled;
+ int softirq_context;
#endif
+
#ifdef CONFIG_LOCKDEP
-# define MAX_LOCK_DEPTH 48UL
- u64 curr_chain_key;
- int lockdep_depth;
- unsigned int lockdep_recursion;
- struct held_lock held_locks[MAX_LOCK_DEPTH];
- gfp_t lockdep_reclaim_gfp;
+# define MAX_LOCK_DEPTH 48UL
+ u64 curr_chain_key;
+ int lockdep_depth;
+ unsigned int lockdep_recursion;
+ struct held_lock held_locks[MAX_LOCK_DEPTH];
+ gfp_t lockdep_reclaim_gfp;
#endif
+
#ifdef CONFIG_UBSAN
- unsigned int in_ubsan;
+ unsigned int in_ubsan;
#endif
-/* journalling filesystem info */
- void *journal_info;
+ /* Journalling filesystem info: */
+ void *journal_info;
-/* stacked block device info */
- struct bio_list *bio_list;
+ /* Stacked block device info: */
+ struct bio_list *bio_list;
#ifdef CONFIG_BLOCK
-/* stack plugging */
- struct blk_plug *plug;
+ /* Stack plugging: */
+ struct blk_plug *plug;
#endif
-/* VM state */
- struct reclaim_state *reclaim_state;
+ /* VM state: */
+ struct reclaim_state *reclaim_state;
+
+ struct backing_dev_info *backing_dev_info;
- struct backing_dev_info *backing_dev_info;
+ struct io_context *io_context;
- struct io_context *io_context;
+ /* Ptrace state: */
+ unsigned long ptrace_message;
+ siginfo_t *last_siginfo;
- unsigned long ptrace_message;
- siginfo_t *last_siginfo; /* For ptrace use. */
- struct task_io_accounting ioac;
-#if defined(CONFIG_TASK_XACCT)
- u64 acct_rss_mem1; /* accumulated rss usage */
- u64 acct_vm_mem1; /* accumulated virtual memory usage */
- u64 acct_timexpd; /* stime + utime since last update */
+ struct task_io_accounting ioac;
+#ifdef CONFIG_TASK_XACCT
+ /* Accumulated RSS usage: */
+ u64 acct_rss_mem1;
+ /* Accumulated virtual memory usage: */
+ u64 acct_vm_mem1;
+ /* stime + utime since last update: */
+ u64 acct_timexpd;
#endif
#ifdef CONFIG_CPUSETS
- nodemask_t mems_allowed; /* Protected by alloc_lock */
- seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
- int cpuset_mem_spread_rotor;
- int cpuset_slab_spread_rotor;
+ /* Protected by ->alloc_lock: */
+ nodemask_t mems_allowed;
+ /* Seqence number to catch updates: */
+ seqcount_t mems_allowed_seq;
+ int cpuset_mem_spread_rotor;
+ int cpuset_slab_spread_rotor;
#endif
#ifdef CONFIG_CGROUPS
- /* Control Group info protected by css_set_lock */
- struct css_set __rcu *cgroups;
- /* cg_list protected by css_set_lock and tsk->alloc_lock */
- struct list_head cg_list;
+ /* Control Group info protected by css_set_lock: */
+ struct css_set __rcu *cgroups;
+ /* cg_list protected by css_set_lock and tsk->alloc_lock: */
+ struct list_head cg_list;
#endif
#ifdef CONFIG_INTEL_RDT_A
- int closid;
+ int closid;
#endif
#ifdef CONFIG_FUTEX
- struct robust_list_head __user *robust_list;
+ struct robust_list_head __user *robust_list;
#ifdef CONFIG_COMPAT
struct compat_robust_list_head __user *compat_robust_list;
#endif
- struct list_head pi_state_list;
- struct futex_pi_state *pi_state_cache;
+ struct list_head pi_state_list;
+ struct futex_pi_state *pi_state_cache;
#endif
#ifdef CONFIG_PERF_EVENTS
- struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
- struct mutex perf_event_mutex;
- struct list_head perf_event_list;
+ struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
+ struct mutex perf_event_mutex;
+ struct list_head perf_event_list;
#endif
#ifdef CONFIG_DEBUG_PREEMPT
- unsigned long preempt_disable_ip;
+ unsigned long preempt_disable_ip;
#endif
#ifdef CONFIG_NUMA
- struct mempolicy *mempolicy; /* Protected by alloc_lock */
- short il_next;
- short pref_node_fork;
+ /* Protected by alloc_lock: */
+ struct mempolicy *mempolicy;
+ short il_next;
+ short pref_node_fork;
#endif
#ifdef CONFIG_NUMA_BALANCING
- int numa_scan_seq;
- unsigned int numa_scan_period;
- unsigned int numa_scan_period_max;
- int numa_preferred_nid;
- unsigned long numa_migrate_retry;
- u64 node_stamp; /* migration stamp */
- u64 last_task_numa_placement;
- u64 last_sum_exec_runtime;
- struct callback_head numa_work;
-
- struct list_head numa_entry;
- struct numa_group *numa_group;
+ int numa_scan_seq;
+ unsigned int numa_scan_period;
+ unsigned int numa_scan_period_max;
+ int numa_preferred_nid;
+ unsigned long numa_migrate_retry;
+ /* Migration stamp: */
+ u64 node_stamp;
+ u64 last_task_numa_placement;
+ u64 last_sum_exec_runtime;
+ struct callback_head numa_work;
+
+ struct list_head numa_entry;
+ struct numa_group *numa_group;
/*
* numa_faults is an array split into four regions:
* during the current scan window. When the scan completes, the counts
* in faults_memory and faults_cpu decay and these values are copied.
*/
- unsigned long *numa_faults;
- unsigned long total_numa_faults;
+ unsigned long *numa_faults;
+ unsigned long total_numa_faults;
/*
* numa_faults_locality tracks if faults recorded during the last
* period is adapted based on the locality of the faults with different
* weights depending on whether they were shared or private faults
*/
- unsigned long numa_faults_locality[3];
+ unsigned long numa_faults_locality[3];
- unsigned long numa_pages_migrated;
+ unsigned long numa_pages_migrated;
#endif /* CONFIG_NUMA_BALANCING */
- struct tlbflush_unmap_batch tlb_ubc;
+ struct tlbflush_unmap_batch tlb_ubc;
- struct rcu_head rcu;
+ struct rcu_head rcu;
- /*
- * cache last used pipe for splice
- */
- struct pipe_inode_info *splice_pipe;
+ /* Cache last used pipe for splice(): */
+ struct pipe_inode_info *splice_pipe;
- struct page_frag task_frag;
+ struct page_frag task_frag;
#ifdef CONFIG_TASK_DELAY_ACCT
struct task_delay_info *delays;
#endif
#ifdef CONFIG_FAULT_INJECTION
- int make_it_fail;
+ int make_it_fail;
#endif
/*
- * when (nr_dirtied >= nr_dirtied_pause), it's time to call
- * balance_dirty_pages() for some dirty throttling pause
+ * When (nr_dirtied >= nr_dirtied_pause), it's time to call
+ * balance_dirty_pages() for a dirty throttling pause:
*/
- int nr_dirtied;
- int nr_dirtied_pause;
- unsigned long dirty_paused_when; /* start of a write-and-pause period */
+ int nr_dirtied;
+ int nr_dirtied_pause;
+ /* Start of a write-and-pause period: */
+ unsigned long dirty_paused_when;
#ifdef CONFIG_LATENCYTOP
- int latency_record_count;
- struct latency_record latency_record[LT_SAVECOUNT];
+ int latency_record_count;
+ struct latency_record latency_record[LT_SAVECOUNT];
#endif
/*
- * time slack values; these are used to round up poll() and
+ * Time slack values; these are used to round up poll() and
* select() etc timeout values. These are in nanoseconds.
*/
- u64 timer_slack_ns;
- u64 default_timer_slack_ns;
+ u64 timer_slack_ns;
+ u64 default_timer_slack_ns;
#ifdef CONFIG_KASAN
- unsigned int kasan_depth;
+ unsigned int kasan_depth;
#endif
+
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
- /* Index of current stored address in ret_stack */
- int curr_ret_stack;
- /* Stack of return addresses for return function tracing */
- struct ftrace_ret_stack *ret_stack;
- /* time stamp for last schedule */
- unsigned long long ftrace_timestamp;
+ /* Index of current stored address in ret_stack: */
+ int curr_ret_stack;
+
+ /* Stack of return addresses for return function tracing: */
+ struct ftrace_ret_stack *ret_stack;
+
+ /* Timestamp for last schedule: */
+ unsigned long long ftrace_timestamp;
+
/*
* Number of functions that haven't been traced
- * because of depth overrun.
+ * because of depth overrun:
*/
- atomic_t trace_overrun;
- /* Pause for the tracing */
- atomic_t tracing_graph_pause;
+ atomic_t trace_overrun;
+
+ /* Pause tracing: */
+ atomic_t tracing_graph_pause;
#endif
+
#ifdef CONFIG_TRACING
- /* state flags for use by tracers */
- unsigned long trace;
- /* bitmask and counter of trace recursion */
- unsigned long trace_recursion;
+ /* State flags for use by tracers: */
+ unsigned long trace;
+
+ /* Bitmask and counter of trace recursion: */
+ unsigned long trace_recursion;
#endif /* CONFIG_TRACING */
+
#ifdef CONFIG_KCOV
- /* Coverage collection mode enabled for this task (0 if disabled). */
- enum kcov_mode kcov_mode;
- /* Size of the kcov_area. */
- unsigned kcov_size;
- /* Buffer for coverage collection. */
- void *kcov_area;
- /* kcov desciptor wired with this task or NULL. */
- struct kcov *kcov;
+ /* Coverage collection mode enabled for this task (0 if disabled): */
+ enum kcov_mode kcov_mode;
+
+ /* Size of the kcov_area: */
+ unsigned int kcov_size;
+
+ /* Buffer for coverage collection: */
+ void *kcov_area;
+
+ /* KCOV descriptor wired with this task or NULL: */
+ struct kcov *kcov;
#endif
+
#ifdef CONFIG_MEMCG
- struct mem_cgroup *memcg_in_oom;
- gfp_t memcg_oom_gfp_mask;
- int memcg_oom_order;
+ struct mem_cgroup *memcg_in_oom;
+ gfp_t memcg_oom_gfp_mask;
+ int memcg_oom_order;
- /* number of pages to reclaim on returning to userland */
- unsigned int memcg_nr_pages_over_high;
+ /* Number of pages to reclaim on returning to userland: */
+ unsigned int memcg_nr_pages_over_high;
#endif
+
#ifdef CONFIG_UPROBES
- struct uprobe_task *utask;
+ struct uprobe_task *utask;
#endif
#if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
- unsigned int sequential_io;
- unsigned int sequential_io_avg;
+ unsigned int sequential_io;
+ unsigned int sequential_io_avg;
#endif
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
- unsigned long task_state_change;
+ unsigned long task_state_change;
#endif
- int pagefault_disabled;
+ int pagefault_disabled;
#ifdef CONFIG_MMU
- struct task_struct *oom_reaper_list;
+ struct task_struct *oom_reaper_list;
#endif
#ifdef CONFIG_VMAP_STACK
- struct vm_struct *stack_vm_area;
+ struct vm_struct *stack_vm_area;
#endif
#ifdef CONFIG_THREAD_INFO_IN_TASK
- /* A live task holds one reference. */
- atomic_t stack_refcount;
+ /* A live task holds one reference: */
+ atomic_t stack_refcount;
#endif
-/* CPU-specific state of this task */
- struct thread_struct thread;
-/*
- * WARNING: on x86, 'thread_struct' contains a variable-sized
- * structure. It *MUST* be at the end of 'task_struct'.
- *
- * Do not put anything below here!
- */
+ /* CPU-specific state of this task: */
+ struct thread_struct thread;
+
+ /*
+ * WARNING: on x86, 'thread_struct' contains a variable-sized
+ * structure. It *MUST* be at the end of 'task_struct'.
+ *
+ * Do not put anything below here!
+ */
};
static inline struct pid *task_pid(struct task_struct *task)
}
/*
- * Without tasklist or rcu lock it is not safe to dereference
+ * Without tasklist or RCU lock it is not safe to dereference
* the result of task_pgrp/task_session even if task == current,
* we can race with another thread doing sys_setsid/sys_setpgid.
*/
*
* see also pid_nr() etc in include/linux/pid.h
*/
-pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
- struct pid_namespace *ns);
+pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns);
static inline pid_t task_pid_nr(struct task_struct *tsk)
{
return tsk->pid;
}
-static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
- struct pid_namespace *ns)
+static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
{
return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
}
return tsk->tgid;
}
-pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
+extern pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
static inline pid_t task_tgid_vnr(struct task_struct *tsk)
{
return pid_vnr(task_tgid(tsk));
}
+/**
+ * pid_alive - check that a task structure is not stale
+ * @p: Task structure to be checked.
+ *
+ * Test if a process is not yet dead (at most zombie state)
+ * If pid_alive fails, then pointers within the task structure
+ * can be stale and must not be dereferenced.
+ *
+ * Return: 1 if the process is alive. 0 otherwise.
+ */
+static inline int pid_alive(const struct task_struct *p)
+{
+ return p->pids[PIDTYPE_PID].pid != NULL;
+}
-static inline int pid_alive(const struct task_struct *p);
static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)
{
pid_t pid = 0;
return task_ppid_nr_ns(tsk, &init_pid_ns);
}
-static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
- struct pid_namespace *ns)
+static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
{
return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
}
}
-static inline pid_t task_session_nr_ns(struct task_struct *tsk,
- struct pid_namespace *ns)
+static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
{
return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
}
return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
}
-/* obsolete, do not use */
+/* Obsolete, do not use: */
static inline pid_t task_pgrp_nr(struct task_struct *tsk)
{
return task_pgrp_nr_ns(tsk, &init_pid_ns);
}
/**
- * pid_alive - check that a task structure is not stale
- * @p: Task structure to be checked.
- *
- * Test if a process is not yet dead (at most zombie state)
- * If pid_alive fails, then pointers within the task structure
- * can be stale and must not be dereferenced.
- *
- * Return: 1 if the process is alive. 0 otherwise.
- */
-static inline int pid_alive(const struct task_struct *p)
-{
- return p->pids[PIDTYPE_PID].pid != NULL;
-}
-
-/**
* is_global_init - check if a task structure is init. Since init
* is free to have sub-threads we need to check tgid.
* @tsk: Task structure to be checked.
/*
* Per process flags
*/
-#define PF_IDLE 0x00000002 /* I am an IDLE thread */
-#define PF_EXITING 0x00000004 /* getting shut down */
-#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
-#define PF_VCPU 0x00000010 /* I'm a virtual CPU */
-#define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
-#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
-#define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
-#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
-#define PF_DUMPCORE 0x00000200 /* dumped core */
-#define PF_SIGNALED 0x00000400 /* killed by a signal */
-#define PF_MEMALLOC 0x00000800 /* Allocating memory */
-#define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
-#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
-#define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */
-#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
-#define PF_FROZEN 0x00010000 /* frozen for system suspend */
-#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
-#define PF_KSWAPD 0x00040000 /* I am kswapd */
-#define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */
-#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
-#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
-#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
-#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
-#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */
-#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
-#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
-#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
-#define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */
+#define PF_IDLE 0x00000002 /* I am an IDLE thread */
+#define PF_EXITING 0x00000004 /* Getting shut down */
+#define PF_EXITPIDONE 0x00000008 /* PI exit done on shut down */
+#define PF_VCPU 0x00000010 /* I'm a virtual CPU */
+#define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
+#define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */
+#define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */
+#define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */
+#define PF_DUMPCORE 0x00000200 /* Dumped core */
+#define PF_SIGNALED 0x00000400 /* Killed by a signal */
+#define PF_MEMALLOC 0x00000800 /* Allocating memory */
+#define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */
+#define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */
+#define PF_USED_ASYNC 0x00004000 /* Used async_schedule*(), used by module init */
+#define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */
+#define PF_FROZEN 0x00010000 /* Frozen for system suspend */
+#define PF_FSTRANS 0x00020000 /* Inside a filesystem transaction */
+#define PF_KSWAPD 0x00040000 /* I am kswapd */
+#define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */
+#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
+#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
+#define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */
+#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
+#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */
+#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
+#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
+#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
+#define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */
/*
* Only the _current_ task can read/write to tsk->flags, but other
* child is not running and in turn not changing child->flags
* at the same time the parent does it.
*/
-#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
-#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
-#define clear_used_math() clear_stopped_child_used_math(current)
-#define set_used_math() set_stopped_child_used_math(current)
+#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
+#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
+#define clear_used_math() clear_stopped_child_used_math(current)
+#define set_used_math() set_stopped_child_used_math(current)
+
#define conditional_stopped_child_used_math(condition, child) \
do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
-#define conditional_used_math(condition) \
- conditional_stopped_child_used_math(condition, current)
+
+#define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current)
+
#define copy_to_stopped_child_used_math(child) \
do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
+
/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
-#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
-#define used_math() tsk_used_math(current)
+#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
+#define used_math() tsk_used_math(current)
/* Per-process atomic flags. */
-#define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */
-#define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */
-#define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */
-#define PFA_LMK_WAITING 3 /* Lowmemorykiller is waiting */
+#define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */
+#define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */
+#define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */
+#define PFA_LMK_WAITING 3 /* Lowmemorykiller is waiting */
#define TASK_PFA_TEST(name, func) \
static inline bool task_##func(struct task_struct *p) \
{ return test_bit(PFA_##name, &p->atomic_flags); }
+
#define TASK_PFA_SET(name, func) \
static inline void task_set_##func(struct task_struct *p) \
{ set_bit(PFA_##name, &p->atomic_flags); }
+
#define TASK_PFA_CLEAR(name, func) \
static inline void task_clear_##func(struct task_struct *p) \
{ clear_bit(PFA_##name, &p->atomic_flags); }
TASK_PFA_TEST(LMK_WAITING, lmk_waiting)
TASK_PFA_SET(LMK_WAITING, lmk_waiting)
-static inline void tsk_restore_flags(struct task_struct *task,
- unsigned long orig_flags, unsigned long flags)
+static inline void
+tsk_restore_flags(struct task_struct *task, unsigned long orig_flags, unsigned long flags)
{
task->flags &= ~flags;
task->flags |= orig_flags & flags;
}
-extern int cpuset_cpumask_can_shrink(const struct cpumask *cur,
- const struct cpumask *trial);
-extern int task_can_attach(struct task_struct *p,
- const struct cpumask *cs_cpus_allowed);
+extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
+extern int task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed);
#ifdef CONFIG_SMP
-extern void do_set_cpus_allowed(struct task_struct *p,
- const struct cpumask *new_mask);
-
-extern int set_cpus_allowed_ptr(struct task_struct *p,
- const struct cpumask *new_mask);
+extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask);
+extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask);
#else
-static inline void do_set_cpus_allowed(struct task_struct *p,
- const struct cpumask *new_mask)
+static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
{
}
-static inline int set_cpus_allowed_ptr(struct task_struct *p,
- const struct cpumask *new_mask)
+static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
{
if (!cpumask_test_cpu(0, new_mask))
return -EINVAL;
extern int yield_to(struct task_struct *p, bool preempt);
extern void set_user_nice(struct task_struct *p, long nice);
extern int task_prio(const struct task_struct *p);
+
/**
* task_nice - return the nice value of a given task.
* @p: the task in question.
{
return PRIO_TO_NICE((p)->static_prio);
}
+
extern int can_nice(const struct task_struct *p, const int nice);
extern int task_curr(const struct task_struct *p);
extern int idle_cpu(int cpu);
-extern int sched_setscheduler(struct task_struct *, int,
- const struct sched_param *);
-extern int sched_setscheduler_nocheck(struct task_struct *, int,
- const struct sched_param *);
-extern int sched_setattr(struct task_struct *,
- const struct sched_attr *);
+extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *);
+extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *);
+extern int sched_setattr(struct task_struct *, const struct sched_attr *);
extern struct task_struct *idle_task(int cpu);
+
/**
* is_idle_task - is the specified task an idle task?
* @p: the task in question.
{
return !!(p->flags & PF_IDLE);
}
+
extern struct task_struct *curr_task(int cpu);
extern void ia64_set_curr_task(int cpu, struct task_struct *p);
*/
extern struct task_struct *find_task_by_vpid(pid_t nr);
-extern struct task_struct *find_task_by_pid_ns(pid_t nr,
- struct pid_namespace *ns);
+extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns);
extern int wake_up_state(struct task_struct *tsk, unsigned int state);
extern int wake_up_process(struct task_struct *tsk);
extern void wake_up_new_task(struct task_struct *tsk);
+
#ifdef CONFIG_SMP
- extern void kick_process(struct task_struct *tsk);
+extern void kick_process(struct task_struct *tsk);
#else
- static inline void kick_process(struct task_struct *tsk) { }
+static inline void kick_process(struct task_struct *tsk) { }
#endif
extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec);
+
static inline void set_task_comm(struct task_struct *tsk, const char *from)
{
__set_task_comm(tsk, from, false);
}
+
extern char *get_task_comm(char *to, struct task_struct *tsk);
#ifdef CONFIG_SMP
extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
#else
static inline void scheduler_ipi(void) { }
-static inline unsigned long wait_task_inactive(struct task_struct *p,
- long match_state)
+static inline unsigned long wait_task_inactive(struct task_struct *p, long match_state)
{
return 1;
}
#endif
-/* set thread flags in other task's structures
- * - see asm/thread_info.h for TIF_xxxx flags available
+/*
+ * Set thread flags in other task's structures.
+ * See asm/thread_info.h for TIF_xxxx flags available:
*/
static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
{
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