4 #include <uapi/linux/sched.h>
11 #include <asm/param.h> /* for HZ */
13 #include <linux/capability.h>
14 #include <linux/threads.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/timex.h>
18 #include <linux/jiffies.h>
19 #include <linux/rbtree.h>
20 #include <linux/thread_info.h>
21 #include <linux/cpumask.h>
22 #include <linux/errno.h>
23 #include <linux/nodemask.h>
24 #include <linux/mm_types.h>
27 #include <asm/ptrace.h>
28 #include <asm/cputime.h>
30 #include <linux/smp.h>
31 #include <linux/sem.h>
32 #include <linux/signal.h>
33 #include <linux/compiler.h>
34 #include <linux/completion.h>
35 #include <linux/pid.h>
36 #include <linux/percpu.h>
37 #include <linux/topology.h>
38 #include <linux/proportions.h>
39 #include <linux/seccomp.h>
40 #include <linux/rcupdate.h>
41 #include <linux/rculist.h>
42 #include <linux/rtmutex.h>
44 #include <linux/time.h>
45 #include <linux/param.h>
46 #include <linux/resource.h>
47 #include <linux/timer.h>
48 #include <linux/hrtimer.h>
49 #include <linux/task_io_accounting.h>
50 #include <linux/latencytop.h>
51 #include <linux/cred.h>
52 #include <linux/llist.h>
53 #include <linux/uidgid.h>
55 #include <asm/processor.h>
58 struct futex_pi_state;
59 struct robust_list_head;
62 struct perf_event_context;
66 * List of flags we want to share for kernel threads,
67 * if only because they are not used by them anyway.
69 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
72 * These are the constant used to fake the fixed-point load-average
73 * counting. Some notes:
74 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
75 * a load-average precision of 10 bits integer + 11 bits fractional
76 * - if you want to count load-averages more often, you need more
77 * precision, or rounding will get you. With 2-second counting freq,
78 * the EXP_n values would be 1981, 2034 and 2043 if still using only
81 extern unsigned long avenrun[]; /* Load averages */
82 extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
84 #define FSHIFT 11 /* nr of bits of precision */
85 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
86 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
87 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
88 #define EXP_5 2014 /* 1/exp(5sec/5min) */
89 #define EXP_15 2037 /* 1/exp(5sec/15min) */
91 #define CALC_LOAD(load,exp,n) \
93 load += n*(FIXED_1-exp); \
96 extern unsigned long total_forks;
97 extern int nr_threads;
98 DECLARE_PER_CPU(unsigned long, process_counts);
99 extern int nr_processes(void);
100 extern unsigned long nr_running(void);
101 extern unsigned long nr_uninterruptible(void);
102 extern unsigned long nr_iowait(void);
103 extern unsigned long nr_iowait_cpu(int cpu);
104 extern unsigned long this_cpu_load(void);
107 extern void calc_global_load(unsigned long ticks);
108 extern void update_cpu_load_nohz(void);
110 extern unsigned long get_parent_ip(unsigned long addr);
115 #ifdef CONFIG_SCHED_DEBUG
116 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
117 extern void proc_sched_set_task(struct task_struct *p);
119 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
122 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
125 static inline void proc_sched_set_task(struct task_struct *p)
129 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
135 * Task state bitmask. NOTE! These bits are also
136 * encoded in fs/proc/array.c: get_task_state().
138 * We have two separate sets of flags: task->state
139 * is about runnability, while task->exit_state are
140 * about the task exiting. Confusing, but this way
141 * modifying one set can't modify the other one by
144 #define TASK_RUNNING 0
145 #define TASK_INTERRUPTIBLE 1
146 #define TASK_UNINTERRUPTIBLE 2
147 #define __TASK_STOPPED 4
148 #define __TASK_TRACED 8
149 /* in tsk->exit_state */
150 #define EXIT_ZOMBIE 16
152 /* in tsk->state again */
154 #define TASK_WAKEKILL 128
155 #define TASK_WAKING 256
156 #define TASK_STATE_MAX 512
158 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
160 extern char ___assert_task_state[1 - 2*!!(
161 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
163 /* Convenience macros for the sake of set_task_state */
164 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
165 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
166 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
168 /* Convenience macros for the sake of wake_up */
169 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
170 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
172 /* get_task_state() */
173 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
174 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
177 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
178 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
179 #define task_is_dead(task) ((task)->exit_state != 0)
180 #define task_is_stopped_or_traced(task) \
181 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
182 #define task_contributes_to_load(task) \
183 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
184 (task->flags & PF_FROZEN) == 0)
186 #define __set_task_state(tsk, state_value) \
187 do { (tsk)->state = (state_value); } while (0)
188 #define set_task_state(tsk, state_value) \
189 set_mb((tsk)->state, (state_value))
192 * set_current_state() includes a barrier so that the write of current->state
193 * is correctly serialised wrt the caller's subsequent test of whether to
196 * set_current_state(TASK_UNINTERRUPTIBLE);
197 * if (do_i_need_to_sleep())
200 * If the caller does not need such serialisation then use __set_current_state()
202 #define __set_current_state(state_value) \
203 do { current->state = (state_value); } while (0)
204 #define set_current_state(state_value) \
205 set_mb(current->state, (state_value))
207 /* Task command name length */
208 #define TASK_COMM_LEN 16
210 #include <linux/spinlock.h>
213 * This serializes "schedule()" and also protects
214 * the run-queue from deletions/modifications (but
215 * _adding_ to the beginning of the run-queue has
218 extern rwlock_t tasklist_lock;
219 extern spinlock_t mmlist_lock;
223 #ifdef CONFIG_PROVE_RCU
224 extern int lockdep_tasklist_lock_is_held(void);
225 #endif /* #ifdef CONFIG_PROVE_RCU */
227 extern void sched_init(void);
228 extern void sched_init_smp(void);
229 extern asmlinkage void schedule_tail(struct task_struct *prev);
230 extern void init_idle(struct task_struct *idle, int cpu);
231 extern void init_idle_bootup_task(struct task_struct *idle);
233 extern int runqueue_is_locked(int cpu);
235 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
236 extern void nohz_balance_enter_idle(int cpu);
237 extern void set_cpu_sd_state_idle(void);
238 extern int get_nohz_timer_target(void);
240 static inline void nohz_balance_enter_idle(int cpu) { }
241 static inline void set_cpu_sd_state_idle(void) { }
245 * Only dump TASK_* tasks. (0 for all tasks)
247 extern void show_state_filter(unsigned long state_filter);
249 static inline void show_state(void)
251 show_state_filter(0);
254 extern void show_regs(struct pt_regs *);
257 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
258 * task), SP is the stack pointer of the first frame that should be shown in the back
259 * trace (or NULL if the entire call-chain of the task should be shown).
261 extern void show_stack(struct task_struct *task, unsigned long *sp);
263 void io_schedule(void);
264 long io_schedule_timeout(long timeout);
266 extern void cpu_init (void);
267 extern void trap_init(void);
268 extern void update_process_times(int user);
269 extern void scheduler_tick(void);
271 extern void sched_show_task(struct task_struct *p);
273 #ifdef CONFIG_LOCKUP_DETECTOR
274 extern void touch_softlockup_watchdog(void);
275 extern void touch_softlockup_watchdog_sync(void);
276 extern void touch_all_softlockup_watchdogs(void);
277 extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
279 size_t *lenp, loff_t *ppos);
280 extern unsigned int softlockup_panic;
281 void lockup_detector_init(void);
283 static inline void touch_softlockup_watchdog(void)
286 static inline void touch_softlockup_watchdog_sync(void)
289 static inline void touch_all_softlockup_watchdogs(void)
292 static inline void lockup_detector_init(void)
297 #ifdef CONFIG_DETECT_HUNG_TASK
298 extern unsigned int sysctl_hung_task_panic;
299 extern unsigned long sysctl_hung_task_check_count;
300 extern unsigned long sysctl_hung_task_timeout_secs;
301 extern unsigned long sysctl_hung_task_warnings;
302 extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
304 size_t *lenp, loff_t *ppos);
306 /* Avoid need for ifdefs elsewhere in the code */
307 enum { sysctl_hung_task_timeout_secs = 0 };
310 /* Attach to any functions which should be ignored in wchan output. */
311 #define __sched __attribute__((__section__(".sched.text")))
313 /* Linker adds these: start and end of __sched functions */
314 extern char __sched_text_start[], __sched_text_end[];
316 /* Is this address in the __sched functions? */
317 extern int in_sched_functions(unsigned long addr);
319 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
320 extern signed long schedule_timeout(signed long timeout);
321 extern signed long schedule_timeout_interruptible(signed long timeout);
322 extern signed long schedule_timeout_killable(signed long timeout);
323 extern signed long schedule_timeout_uninterruptible(signed long timeout);
324 asmlinkage void schedule(void);
325 extern void schedule_preempt_disabled(void);
326 extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);
329 struct user_namespace;
332 * Default maximum number of active map areas, this limits the number of vmas
333 * per mm struct. Users can overwrite this number by sysctl but there is a
336 * When a program's coredump is generated as ELF format, a section is created
337 * per a vma. In ELF, the number of sections is represented in unsigned short.
338 * This means the number of sections should be smaller than 65535 at coredump.
339 * Because the kernel adds some informative sections to a image of program at
340 * generating coredump, we need some margin. The number of extra sections is
341 * 1-3 now and depends on arch. We use "5" as safe margin, here.
343 #define MAPCOUNT_ELF_CORE_MARGIN (5)
344 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
346 extern int sysctl_max_map_count;
348 #include <linux/aio.h>
351 extern void arch_pick_mmap_layout(struct mm_struct *mm);
353 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
354 unsigned long, unsigned long);
356 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
357 unsigned long len, unsigned long pgoff,
358 unsigned long flags);
359 extern void arch_unmap_area(struct mm_struct *, unsigned long);
360 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
362 static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
366 extern void set_dumpable(struct mm_struct *mm, int value);
367 extern int get_dumpable(struct mm_struct *mm);
369 /* get/set_dumpable() values */
370 #define SUID_DUMPABLE_DISABLED 0
371 #define SUID_DUMPABLE_ENABLED 1
372 #define SUID_DUMPABLE_SAFE 2
376 #define MMF_DUMPABLE 0 /* core dump is permitted */
377 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
379 #define MMF_DUMPABLE_BITS 2
380 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
382 /* coredump filter bits */
383 #define MMF_DUMP_ANON_PRIVATE 2
384 #define MMF_DUMP_ANON_SHARED 3
385 #define MMF_DUMP_MAPPED_PRIVATE 4
386 #define MMF_DUMP_MAPPED_SHARED 5
387 #define MMF_DUMP_ELF_HEADERS 6
388 #define MMF_DUMP_HUGETLB_PRIVATE 7
389 #define MMF_DUMP_HUGETLB_SHARED 8
391 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
392 #define MMF_DUMP_FILTER_BITS 7
393 #define MMF_DUMP_FILTER_MASK \
394 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
395 #define MMF_DUMP_FILTER_DEFAULT \
396 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
397 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
399 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
400 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
402 # define MMF_DUMP_MASK_DEFAULT_ELF 0
404 /* leave room for more dump flags */
405 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
406 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
407 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
409 #define MMF_HAS_UPROBES 19 /* has uprobes */
410 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
412 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
414 struct sighand_struct {
416 struct k_sigaction action[_NSIG];
418 wait_queue_head_t signalfd_wqh;
421 struct pacct_struct {
424 unsigned long ac_mem;
425 cputime_t ac_utime, ac_stime;
426 unsigned long ac_minflt, ac_majflt;
437 * struct task_cputime - collected CPU time counts
438 * @utime: time spent in user mode, in &cputime_t units
439 * @stime: time spent in kernel mode, in &cputime_t units
440 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
442 * This structure groups together three kinds of CPU time that are
443 * tracked for threads and thread groups. Most things considering
444 * CPU time want to group these counts together and treat all three
445 * of them in parallel.
447 struct task_cputime {
450 unsigned long long sum_exec_runtime;
452 /* Alternate field names when used to cache expirations. */
453 #define prof_exp stime
454 #define virt_exp utime
455 #define sched_exp sum_exec_runtime
457 #define INIT_CPUTIME \
458 (struct task_cputime) { \
461 .sum_exec_runtime = 0, \
465 * Disable preemption until the scheduler is running.
466 * Reset by start_kernel()->sched_init()->init_idle().
468 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
469 * before the scheduler is active -- see should_resched().
471 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
474 * struct thread_group_cputimer - thread group interval timer counts
475 * @cputime: thread group interval timers.
476 * @running: non-zero when there are timers running and
477 * @cputime receives updates.
478 * @lock: lock for fields in this struct.
480 * This structure contains the version of task_cputime, above, that is
481 * used for thread group CPU timer calculations.
483 struct thread_group_cputimer {
484 struct task_cputime cputime;
489 #include <linux/rwsem.h>
493 * NOTE! "signal_struct" does not have its own
494 * locking, because a shared signal_struct always
495 * implies a shared sighand_struct, so locking
496 * sighand_struct is always a proper superset of
497 * the locking of signal_struct.
499 struct signal_struct {
504 wait_queue_head_t wait_chldexit; /* for wait4() */
506 /* current thread group signal load-balancing target: */
507 struct task_struct *curr_target;
509 /* shared signal handling: */
510 struct sigpending shared_pending;
512 /* thread group exit support */
515 * - notify group_exit_task when ->count is equal to notify_count
516 * - everyone except group_exit_task is stopped during signal delivery
517 * of fatal signals, group_exit_task processes the signal.
520 struct task_struct *group_exit_task;
522 /* thread group stop support, overloads group_exit_code too */
523 int group_stop_count;
524 unsigned int flags; /* see SIGNAL_* flags below */
527 * PR_SET_CHILD_SUBREAPER marks a process, like a service
528 * manager, to re-parent orphan (double-forking) child processes
529 * to this process instead of 'init'. The service manager is
530 * able to receive SIGCHLD signals and is able to investigate
531 * the process until it calls wait(). All children of this
532 * process will inherit a flag if they should look for a
533 * child_subreaper process at exit.
535 unsigned int is_child_subreaper:1;
536 unsigned int has_child_subreaper:1;
538 /* POSIX.1b Interval Timers */
539 struct list_head posix_timers;
541 /* ITIMER_REAL timer for the process */
542 struct hrtimer real_timer;
543 struct pid *leader_pid;
544 ktime_t it_real_incr;
547 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
548 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
549 * values are defined to 0 and 1 respectively
551 struct cpu_itimer it[2];
554 * Thread group totals for process CPU timers.
555 * See thread_group_cputimer(), et al, for details.
557 struct thread_group_cputimer cputimer;
559 /* Earliest-expiration cache. */
560 struct task_cputime cputime_expires;
562 struct list_head cpu_timers[3];
564 struct pid *tty_old_pgrp;
566 /* boolean value for session group leader */
569 struct tty_struct *tty; /* NULL if no tty */
571 #ifdef CONFIG_SCHED_AUTOGROUP
572 struct autogroup *autogroup;
575 * Cumulative resource counters for dead threads in the group,
576 * and for reaped dead child processes forked by this group.
577 * Live threads maintain their own counters and add to these
578 * in __exit_signal, except for the group leader.
580 cputime_t utime, stime, cutime, cstime;
583 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
584 cputime_t prev_utime, prev_stime;
586 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
587 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
588 unsigned long inblock, oublock, cinblock, coublock;
589 unsigned long maxrss, cmaxrss;
590 struct task_io_accounting ioac;
593 * Cumulative ns of schedule CPU time fo dead threads in the
594 * group, not including a zombie group leader, (This only differs
595 * from jiffies_to_ns(utime + stime) if sched_clock uses something
596 * other than jiffies.)
598 unsigned long long sum_sched_runtime;
601 * We don't bother to synchronize most readers of this at all,
602 * because there is no reader checking a limit that actually needs
603 * to get both rlim_cur and rlim_max atomically, and either one
604 * alone is a single word that can safely be read normally.
605 * getrlimit/setrlimit use task_lock(current->group_leader) to
606 * protect this instead of the siglock, because they really
607 * have no need to disable irqs.
609 struct rlimit rlim[RLIM_NLIMITS];
611 #ifdef CONFIG_BSD_PROCESS_ACCT
612 struct pacct_struct pacct; /* per-process accounting information */
614 #ifdef CONFIG_TASKSTATS
615 struct taskstats *stats;
619 struct tty_audit_buf *tty_audit_buf;
621 #ifdef CONFIG_CGROUPS
623 * group_rwsem prevents new tasks from entering the threadgroup and
624 * member tasks from exiting,a more specifically, setting of
625 * PF_EXITING. fork and exit paths are protected with this rwsem
626 * using threadgroup_change_begin/end(). Users which require
627 * threadgroup to remain stable should use threadgroup_[un]lock()
628 * which also takes care of exec path. Currently, cgroup is the
631 struct rw_semaphore group_rwsem;
634 int oom_score_adj; /* OOM kill score adjustment */
635 int oom_score_adj_min; /* OOM kill score adjustment minimum value.
636 * Only settable by CAP_SYS_RESOURCE. */
638 struct mutex cred_guard_mutex; /* guard against foreign influences on
639 * credential calculations
640 * (notably. ptrace) */
644 * Bits in flags field of signal_struct.
646 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
647 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
648 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
650 * Pending notifications to parent.
652 #define SIGNAL_CLD_STOPPED 0x00000010
653 #define SIGNAL_CLD_CONTINUED 0x00000020
654 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
656 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
658 /* If true, all threads except ->group_exit_task have pending SIGKILL */
659 static inline int signal_group_exit(const struct signal_struct *sig)
661 return (sig->flags & SIGNAL_GROUP_EXIT) ||
662 (sig->group_exit_task != NULL);
666 * Some day this will be a full-fledged user tracking system..
669 atomic_t __count; /* reference count */
670 atomic_t processes; /* How many processes does this user have? */
671 atomic_t files; /* How many open files does this user have? */
672 atomic_t sigpending; /* How many pending signals does this user have? */
673 #ifdef CONFIG_INOTIFY_USER
674 atomic_t inotify_watches; /* How many inotify watches does this user have? */
675 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
677 #ifdef CONFIG_FANOTIFY
678 atomic_t fanotify_listeners;
681 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
683 #ifdef CONFIG_POSIX_MQUEUE
684 /* protected by mq_lock */
685 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
687 unsigned long locked_shm; /* How many pages of mlocked shm ? */
690 struct key *uid_keyring; /* UID specific keyring */
691 struct key *session_keyring; /* UID's default session keyring */
694 /* Hash table maintenance information */
695 struct hlist_node uidhash_node;
698 #ifdef CONFIG_PERF_EVENTS
699 atomic_long_t locked_vm;
703 extern int uids_sysfs_init(void);
705 extern struct user_struct *find_user(kuid_t);
707 extern struct user_struct root_user;
708 #define INIT_USER (&root_user)
711 struct backing_dev_info;
712 struct reclaim_state;
714 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
716 /* cumulative counters */
717 unsigned long pcount; /* # of times run on this cpu */
718 unsigned long long run_delay; /* time spent waiting on a runqueue */
721 unsigned long long last_arrival,/* when we last ran on a cpu */
722 last_queued; /* when we were last queued to run */
724 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
726 #ifdef CONFIG_TASK_DELAY_ACCT
727 struct task_delay_info {
729 unsigned int flags; /* Private per-task flags */
731 /* For each stat XXX, add following, aligned appropriately
733 * struct timespec XXX_start, XXX_end;
737 * Atomicity of updates to XXX_delay, XXX_count protected by
738 * single lock above (split into XXX_lock if contention is an issue).
742 * XXX_count is incremented on every XXX operation, the delay
743 * associated with the operation is added to XXX_delay.
744 * XXX_delay contains the accumulated delay time in nanoseconds.
746 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
747 u64 blkio_delay; /* wait for sync block io completion */
748 u64 swapin_delay; /* wait for swapin block io completion */
749 u32 blkio_count; /* total count of the number of sync block */
750 /* io operations performed */
751 u32 swapin_count; /* total count of the number of swapin block */
752 /* io operations performed */
754 struct timespec freepages_start, freepages_end;
755 u64 freepages_delay; /* wait for memory reclaim */
756 u32 freepages_count; /* total count of memory reclaim */
758 #endif /* CONFIG_TASK_DELAY_ACCT */
760 static inline int sched_info_on(void)
762 #ifdef CONFIG_SCHEDSTATS
764 #elif defined(CONFIG_TASK_DELAY_ACCT)
765 extern int delayacct_on;
780 * Increase resolution of nice-level calculations for 64-bit architectures.
781 * The extra resolution improves shares distribution and load balancing of
782 * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
783 * hierarchies, especially on larger systems. This is not a user-visible change
784 * and does not change the user-interface for setting shares/weights.
786 * We increase resolution only if we have enough bits to allow this increased
787 * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
788 * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
791 #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */
792 # define SCHED_LOAD_RESOLUTION 10
793 # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION)
794 # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION)
796 # define SCHED_LOAD_RESOLUTION 0
797 # define scale_load(w) (w)
798 # define scale_load_down(w) (w)
801 #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION)
802 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
805 * Increase resolution of cpu_power calculations
807 #define SCHED_POWER_SHIFT 10
808 #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
811 * sched-domains (multiprocessor balancing) declarations:
814 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
815 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
816 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
817 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
818 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
819 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
820 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
821 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
822 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
823 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
824 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
825 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
827 extern int __weak arch_sd_sibiling_asym_packing(void);
829 struct sched_group_power {
832 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
835 unsigned int power, power_orig;
836 unsigned long next_update;
838 * Number of busy cpus in this group.
840 atomic_t nr_busy_cpus;
842 unsigned long cpumask[0]; /* iteration mask */
846 struct sched_group *next; /* Must be a circular list */
849 unsigned int group_weight;
850 struct sched_group_power *sgp;
853 * The CPUs this group covers.
855 * NOTE: this field is variable length. (Allocated dynamically
856 * by attaching extra space to the end of the structure,
857 * depending on how many CPUs the kernel has booted up with)
859 unsigned long cpumask[0];
862 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
864 return to_cpumask(sg->cpumask);
868 * cpumask masking which cpus in the group are allowed to iterate up the domain
871 static inline struct cpumask *sched_group_mask(struct sched_group *sg)
873 return to_cpumask(sg->sgp->cpumask);
877 * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
878 * @group: The group whose first cpu is to be returned.
880 static inline unsigned int group_first_cpu(struct sched_group *group)
882 return cpumask_first(sched_group_cpus(group));
885 struct sched_domain_attr {
886 int relax_domain_level;
889 #define SD_ATTR_INIT (struct sched_domain_attr) { \
890 .relax_domain_level = -1, \
893 extern int sched_domain_level_max;
895 struct sched_domain {
896 /* These fields must be setup */
897 struct sched_domain *parent; /* top domain must be null terminated */
898 struct sched_domain *child; /* bottom domain must be null terminated */
899 struct sched_group *groups; /* the balancing groups of the domain */
900 unsigned long min_interval; /* Minimum balance interval ms */
901 unsigned long max_interval; /* Maximum balance interval ms */
902 unsigned int busy_factor; /* less balancing by factor if busy */
903 unsigned int imbalance_pct; /* No balance until over watermark */
904 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
905 unsigned int busy_idx;
906 unsigned int idle_idx;
907 unsigned int newidle_idx;
908 unsigned int wake_idx;
909 unsigned int forkexec_idx;
910 unsigned int smt_gain;
911 int flags; /* See SD_* */
914 /* Runtime fields. */
915 unsigned long last_balance; /* init to jiffies. units in jiffies */
916 unsigned int balance_interval; /* initialise to 1. units in ms. */
917 unsigned int nr_balance_failed; /* initialise to 0 */
921 #ifdef CONFIG_SCHEDSTATS
922 /* load_balance() stats */
923 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
924 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
925 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
926 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
927 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
928 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
929 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
930 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
932 /* Active load balancing */
933 unsigned int alb_count;
934 unsigned int alb_failed;
935 unsigned int alb_pushed;
937 /* SD_BALANCE_EXEC stats */
938 unsigned int sbe_count;
939 unsigned int sbe_balanced;
940 unsigned int sbe_pushed;
942 /* SD_BALANCE_FORK stats */
943 unsigned int sbf_count;
944 unsigned int sbf_balanced;
945 unsigned int sbf_pushed;
947 /* try_to_wake_up() stats */
948 unsigned int ttwu_wake_remote;
949 unsigned int ttwu_move_affine;
950 unsigned int ttwu_move_balance;
952 #ifdef CONFIG_SCHED_DEBUG
956 void *private; /* used during construction */
957 struct rcu_head rcu; /* used during destruction */
960 unsigned int span_weight;
962 * Span of all CPUs in this domain.
964 * NOTE: this field is variable length. (Allocated dynamically
965 * by attaching extra space to the end of the structure,
966 * depending on how many CPUs the kernel has booted up with)
968 unsigned long span[0];
971 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
973 return to_cpumask(sd->span);
976 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
977 struct sched_domain_attr *dattr_new);
979 /* Allocate an array of sched domains, for partition_sched_domains(). */
980 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
981 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
983 /* Test a flag in parent sched domain */
984 static inline int test_sd_parent(struct sched_domain *sd, int flag)
986 if (sd->parent && (sd->parent->flags & flag))
992 unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
993 unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
995 bool cpus_share_cache(int this_cpu, int that_cpu);
997 #else /* CONFIG_SMP */
999 struct sched_domain_attr;
1002 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1003 struct sched_domain_attr *dattr_new)
1007 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
1012 #endif /* !CONFIG_SMP */
1015 struct io_context; /* See blkdev.h */
1018 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1019 extern void prefetch_stack(struct task_struct *t);
1021 static inline void prefetch_stack(struct task_struct *t) { }
1024 struct audit_context; /* See audit.c */
1026 struct pipe_inode_info;
1027 struct uts_namespace;
1030 struct sched_domain;
1035 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
1036 #define WF_FORK 0x02 /* child wakeup after fork */
1037 #define WF_MIGRATED 0x04 /* internal use, task got migrated */
1039 #define ENQUEUE_WAKEUP 1
1040 #define ENQUEUE_HEAD 2
1042 #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */
1044 #define ENQUEUE_WAKING 0
1047 #define DEQUEUE_SLEEP 1
1049 struct sched_class {
1050 const struct sched_class *next;
1052 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
1053 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
1054 void (*yield_task) (struct rq *rq);
1055 bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt);
1057 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
1059 struct task_struct * (*pick_next_task) (struct rq *rq);
1060 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
1063 int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);
1064 void (*migrate_task_rq)(struct task_struct *p, int next_cpu);
1066 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1067 void (*post_schedule) (struct rq *this_rq);
1068 void (*task_waking) (struct task_struct *task);
1069 void (*task_woken) (struct rq *this_rq, struct task_struct *task);
1071 void (*set_cpus_allowed)(struct task_struct *p,
1072 const struct cpumask *newmask);
1074 void (*rq_online)(struct rq *rq);
1075 void (*rq_offline)(struct rq *rq);
1078 void (*set_curr_task) (struct rq *rq);
1079 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1080 void (*task_fork) (struct task_struct *p);
1082 void (*switched_from) (struct rq *this_rq, struct task_struct *task);
1083 void (*switched_to) (struct rq *this_rq, struct task_struct *task);
1084 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1087 unsigned int (*get_rr_interval) (struct rq *rq,
1088 struct task_struct *task);
1090 #ifdef CONFIG_FAIR_GROUP_SCHED
1091 void (*task_move_group) (struct task_struct *p, int on_rq);
1095 struct load_weight {
1096 unsigned long weight, inv_weight;
1101 * These sums represent an infinite geometric series and so are bound
1102 * above by 1024/(1-y). Thus we only need a u32 to store them for for all
1103 * choices of y < 1-2^(-32)*1024.
1105 u32 runnable_avg_sum, runnable_avg_period;
1106 u64 last_runnable_update;
1108 unsigned long load_avg_contrib;
1111 #ifdef CONFIG_SCHEDSTATS
1112 struct sched_statistics {
1122 s64 sum_sleep_runtime;
1129 u64 nr_migrations_cold;
1130 u64 nr_failed_migrations_affine;
1131 u64 nr_failed_migrations_running;
1132 u64 nr_failed_migrations_hot;
1133 u64 nr_forced_migrations;
1136 u64 nr_wakeups_sync;
1137 u64 nr_wakeups_migrate;
1138 u64 nr_wakeups_local;
1139 u64 nr_wakeups_remote;
1140 u64 nr_wakeups_affine;
1141 u64 nr_wakeups_affine_attempts;
1142 u64 nr_wakeups_passive;
1143 u64 nr_wakeups_idle;
1147 struct sched_entity {
1148 struct load_weight load; /* for load-balancing */
1149 struct rb_node run_node;
1150 struct list_head group_node;
1154 u64 sum_exec_runtime;
1156 u64 prev_sum_exec_runtime;
1160 #ifdef CONFIG_SCHEDSTATS
1161 struct sched_statistics statistics;
1164 #ifdef CONFIG_FAIR_GROUP_SCHED
1165 struct sched_entity *parent;
1166 /* rq on which this entity is (to be) queued: */
1167 struct cfs_rq *cfs_rq;
1168 /* rq "owned" by this entity/group: */
1169 struct cfs_rq *my_q;
1172 * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
1173 * removed when useful for applications beyond shares distribution (e.g.
1176 #if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
1177 /* Per-entity load-tracking */
1178 struct sched_avg avg;
1182 struct sched_rt_entity {
1183 struct list_head run_list;
1184 unsigned long timeout;
1185 unsigned int time_slice;
1187 struct sched_rt_entity *back;
1188 #ifdef CONFIG_RT_GROUP_SCHED
1189 struct sched_rt_entity *parent;
1190 /* rq on which this entity is (to be) queued: */
1191 struct rt_rq *rt_rq;
1192 /* rq "owned" by this entity/group: */
1198 * default timeslice is 100 msecs (used only for SCHED_RR tasks).
1199 * Timeslices get refilled after they expire.
1201 #define RR_TIMESLICE (100 * HZ / 1000)
1205 enum perf_event_task_context {
1206 perf_invalid_context = -1,
1207 perf_hw_context = 0,
1209 perf_nr_task_contexts,
1212 struct task_struct {
1213 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1216 unsigned int flags; /* per process flags, defined below */
1217 unsigned int ptrace;
1220 struct llist_node wake_entry;
1225 int prio, static_prio, normal_prio;
1226 unsigned int rt_priority;
1227 const struct sched_class *sched_class;
1228 struct sched_entity se;
1229 struct sched_rt_entity rt;
1230 #ifdef CONFIG_CGROUP_SCHED
1231 struct task_group *sched_task_group;
1234 #ifdef CONFIG_PREEMPT_NOTIFIERS
1235 /* list of struct preempt_notifier: */
1236 struct hlist_head preempt_notifiers;
1240 * fpu_counter contains the number of consecutive context switches
1241 * that the FPU is used. If this is over a threshold, the lazy fpu
1242 * saving becomes unlazy to save the trap. This is an unsigned char
1243 * so that after 256 times the counter wraps and the behavior turns
1244 * lazy again; this to deal with bursty apps that only use FPU for
1247 unsigned char fpu_counter;
1248 #ifdef CONFIG_BLK_DEV_IO_TRACE
1249 unsigned int btrace_seq;
1252 unsigned int policy;
1253 int nr_cpus_allowed;
1254 cpumask_t cpus_allowed;
1256 #ifdef CONFIG_PREEMPT_RCU
1257 int rcu_read_lock_nesting;
1258 char rcu_read_unlock_special;
1259 struct list_head rcu_node_entry;
1260 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1261 #ifdef CONFIG_TREE_PREEMPT_RCU
1262 struct rcu_node *rcu_blocked_node;
1263 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1264 #ifdef CONFIG_RCU_BOOST
1265 struct rt_mutex *rcu_boost_mutex;
1266 #endif /* #ifdef CONFIG_RCU_BOOST */
1268 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1269 struct sched_info sched_info;
1272 struct list_head tasks;
1274 struct plist_node pushable_tasks;
1277 struct mm_struct *mm, *active_mm;
1278 #ifdef CONFIG_COMPAT_BRK
1279 unsigned brk_randomized:1;
1281 #if defined(SPLIT_RSS_COUNTING)
1282 struct task_rss_stat rss_stat;
1286 int exit_code, exit_signal;
1287 int pdeath_signal; /* The signal sent when the parent dies */
1288 unsigned int jobctl; /* JOBCTL_*, siglock protected */
1290 unsigned int personality;
1291 unsigned did_exec:1;
1292 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1294 unsigned in_iowait:1;
1296 /* task may not gain privileges */
1297 unsigned no_new_privs:1;
1299 /* Revert to default priority/policy when forking */
1300 unsigned sched_reset_on_fork:1;
1301 unsigned sched_contributes_to_load:1;
1306 #ifdef CONFIG_CC_STACKPROTECTOR
1307 /* Canary value for the -fstack-protector gcc feature */
1308 unsigned long stack_canary;
1311 * pointers to (original) parent process, youngest child, younger sibling,
1312 * older sibling, respectively. (p->father can be replaced with
1313 * p->real_parent->pid)
1315 struct task_struct __rcu *real_parent; /* real parent process */
1316 struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
1318 * children/sibling forms the list of my natural children
1320 struct list_head children; /* list of my children */
1321 struct list_head sibling; /* linkage in my parent's children list */
1322 struct task_struct *group_leader; /* threadgroup leader */
1325 * ptraced is the list of tasks this task is using ptrace on.
1326 * This includes both natural children and PTRACE_ATTACH targets.
1327 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1329 struct list_head ptraced;
1330 struct list_head ptrace_entry;
1332 /* PID/PID hash table linkage. */
1333 struct pid_link pids[PIDTYPE_MAX];
1334 struct list_head thread_group;
1336 struct completion *vfork_done; /* for vfork() */
1337 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1338 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1340 cputime_t utime, stime, utimescaled, stimescaled;
1342 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
1343 cputime_t prev_utime, prev_stime;
1345 unsigned long nvcsw, nivcsw; /* context switch counts */
1346 struct timespec start_time; /* monotonic time */
1347 struct timespec real_start_time; /* boot based time */
1348 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1349 unsigned long min_flt, maj_flt;
1351 struct task_cputime cputime_expires;
1352 struct list_head cpu_timers[3];
1354 /* process credentials */
1355 const struct cred __rcu *real_cred; /* objective and real subjective task
1356 * credentials (COW) */
1357 const struct cred __rcu *cred; /* effective (overridable) subjective task
1358 * credentials (COW) */
1359 char comm[TASK_COMM_LEN]; /* executable name excluding path
1360 - access with [gs]et_task_comm (which lock
1361 it with task_lock())
1362 - initialized normally by setup_new_exec */
1363 /* file system info */
1364 int link_count, total_link_count;
1365 #ifdef CONFIG_SYSVIPC
1367 struct sysv_sem sysvsem;
1369 #ifdef CONFIG_DETECT_HUNG_TASK
1370 /* hung task detection */
1371 unsigned long last_switch_count;
1373 /* CPU-specific state of this task */
1374 struct thread_struct thread;
1375 /* filesystem information */
1376 struct fs_struct *fs;
1377 /* open file information */
1378 struct files_struct *files;
1380 struct nsproxy *nsproxy;
1381 /* signal handlers */
1382 struct signal_struct *signal;
1383 struct sighand_struct *sighand;
1385 sigset_t blocked, real_blocked;
1386 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1387 struct sigpending pending;
1389 unsigned long sas_ss_sp;
1391 int (*notifier)(void *priv);
1392 void *notifier_data;
1393 sigset_t *notifier_mask;
1394 struct callback_head *task_works;
1396 struct audit_context *audit_context;
1397 #ifdef CONFIG_AUDITSYSCALL
1399 unsigned int sessionid;
1401 struct seccomp seccomp;
1403 /* Thread group tracking */
1406 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1408 spinlock_t alloc_lock;
1410 /* Protection of the PI data structures: */
1411 raw_spinlock_t pi_lock;
1413 #ifdef CONFIG_RT_MUTEXES
1414 /* PI waiters blocked on a rt_mutex held by this task */
1415 struct plist_head pi_waiters;
1416 /* Deadlock detection and priority inheritance handling */
1417 struct rt_mutex_waiter *pi_blocked_on;
1420 #ifdef CONFIG_DEBUG_MUTEXES
1421 /* mutex deadlock detection */
1422 struct mutex_waiter *blocked_on;
1424 #ifdef CONFIG_TRACE_IRQFLAGS
1425 unsigned int irq_events;
1426 unsigned long hardirq_enable_ip;
1427 unsigned long hardirq_disable_ip;
1428 unsigned int hardirq_enable_event;
1429 unsigned int hardirq_disable_event;
1430 int hardirqs_enabled;
1431 int hardirq_context;
1432 unsigned long softirq_disable_ip;
1433 unsigned long softirq_enable_ip;
1434 unsigned int softirq_disable_event;
1435 unsigned int softirq_enable_event;
1436 int softirqs_enabled;
1437 int softirq_context;
1439 #ifdef CONFIG_LOCKDEP
1440 # define MAX_LOCK_DEPTH 48UL
1443 unsigned int lockdep_recursion;
1444 struct held_lock held_locks[MAX_LOCK_DEPTH];
1445 gfp_t lockdep_reclaim_gfp;
1448 /* journalling filesystem info */
1451 /* stacked block device info */
1452 struct bio_list *bio_list;
1455 /* stack plugging */
1456 struct blk_plug *plug;
1460 struct reclaim_state *reclaim_state;
1462 struct backing_dev_info *backing_dev_info;
1464 struct io_context *io_context;
1466 unsigned long ptrace_message;
1467 siginfo_t *last_siginfo; /* For ptrace use. */
1468 struct task_io_accounting ioac;
1469 #if defined(CONFIG_TASK_XACCT)
1470 u64 acct_rss_mem1; /* accumulated rss usage */
1471 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1472 cputime_t acct_timexpd; /* stime + utime since last update */
1474 #ifdef CONFIG_CPUSETS
1475 nodemask_t mems_allowed; /* Protected by alloc_lock */
1476 seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
1477 int cpuset_mem_spread_rotor;
1478 int cpuset_slab_spread_rotor;
1480 #ifdef CONFIG_CGROUPS
1481 /* Control Group info protected by css_set_lock */
1482 struct css_set __rcu *cgroups;
1483 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1484 struct list_head cg_list;
1487 struct robust_list_head __user *robust_list;
1488 #ifdef CONFIG_COMPAT
1489 struct compat_robust_list_head __user *compat_robust_list;
1491 struct list_head pi_state_list;
1492 struct futex_pi_state *pi_state_cache;
1494 #ifdef CONFIG_PERF_EVENTS
1495 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1496 struct mutex perf_event_mutex;
1497 struct list_head perf_event_list;
1500 struct mempolicy *mempolicy; /* Protected by alloc_lock */
1502 short pref_node_fork;
1504 struct rcu_head rcu;
1507 * cache last used pipe for splice
1509 struct pipe_inode_info *splice_pipe;
1511 struct page_frag task_frag;
1513 #ifdef CONFIG_TASK_DELAY_ACCT
1514 struct task_delay_info *delays;
1516 #ifdef CONFIG_FAULT_INJECTION
1520 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1521 * balance_dirty_pages() for some dirty throttling pause
1524 int nr_dirtied_pause;
1525 unsigned long dirty_paused_when; /* start of a write-and-pause period */
1527 #ifdef CONFIG_LATENCYTOP
1528 int latency_record_count;
1529 struct latency_record latency_record[LT_SAVECOUNT];
1532 * time slack values; these are used to round up poll() and
1533 * select() etc timeout values. These are in nanoseconds.
1535 unsigned long timer_slack_ns;
1536 unsigned long default_timer_slack_ns;
1538 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1539 /* Index of current stored address in ret_stack */
1541 /* Stack of return addresses for return function tracing */
1542 struct ftrace_ret_stack *ret_stack;
1543 /* time stamp for last schedule */
1544 unsigned long long ftrace_timestamp;
1546 * Number of functions that haven't been traced
1547 * because of depth overrun.
1549 atomic_t trace_overrun;
1550 /* Pause for the tracing */
1551 atomic_t tracing_graph_pause;
1553 #ifdef CONFIG_TRACING
1554 /* state flags for use by tracers */
1555 unsigned long trace;
1556 /* bitmask and counter of trace recursion */
1557 unsigned long trace_recursion;
1558 #endif /* CONFIG_TRACING */
1559 #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
1560 struct memcg_batch_info {
1561 int do_batch; /* incremented when batch uncharge started */
1562 struct mem_cgroup *memcg; /* target memcg of uncharge */
1563 unsigned long nr_pages; /* uncharged usage */
1564 unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
1567 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1568 atomic_t ptrace_bp_refcnt;
1570 #ifdef CONFIG_UPROBES
1571 struct uprobe_task *utask;
1575 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1576 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1579 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1580 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1581 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1582 * values are inverted: lower p->prio value means higher priority.
1584 * The MAX_USER_RT_PRIO value allows the actual maximum
1585 * RT priority to be separate from the value exported to
1586 * user-space. This allows kernel threads to set their
1587 * priority to a value higher than any user task. Note:
1588 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1591 #define MAX_USER_RT_PRIO 100
1592 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1594 #define MAX_PRIO (MAX_RT_PRIO + 40)
1595 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1597 static inline int rt_prio(int prio)
1599 if (unlikely(prio < MAX_RT_PRIO))
1604 static inline int rt_task(struct task_struct *p)
1606 return rt_prio(p->prio);
1609 static inline struct pid *task_pid(struct task_struct *task)
1611 return task->pids[PIDTYPE_PID].pid;
1614 static inline struct pid *task_tgid(struct task_struct *task)
1616 return task->group_leader->pids[PIDTYPE_PID].pid;
1620 * Without tasklist or rcu lock it is not safe to dereference
1621 * the result of task_pgrp/task_session even if task == current,
1622 * we can race with another thread doing sys_setsid/sys_setpgid.
1624 static inline struct pid *task_pgrp(struct task_struct *task)
1626 return task->group_leader->pids[PIDTYPE_PGID].pid;
1629 static inline struct pid *task_session(struct task_struct *task)
1631 return task->group_leader->pids[PIDTYPE_SID].pid;
1634 struct pid_namespace;
1637 * the helpers to get the task's different pids as they are seen
1638 * from various namespaces
1640 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1641 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1643 * task_xid_nr_ns() : id seen from the ns specified;
1645 * set_task_vxid() : assigns a virtual id to a task;
1647 * see also pid_nr() etc in include/linux/pid.h
1649 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1650 struct pid_namespace *ns);
1652 static inline pid_t task_pid_nr(struct task_struct *tsk)
1657 static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1658 struct pid_namespace *ns)
1660 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1663 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1665 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1669 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1674 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1676 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1678 return pid_vnr(task_tgid(tsk));
1682 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1683 struct pid_namespace *ns)
1685 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1688 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1690 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1694 static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1695 struct pid_namespace *ns)
1697 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1700 static inline pid_t task_session_vnr(struct task_struct *tsk)
1702 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1705 /* obsolete, do not use */
1706 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1708 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1712 * pid_alive - check that a task structure is not stale
1713 * @p: Task structure to be checked.
1715 * Test if a process is not yet dead (at most zombie state)
1716 * If pid_alive fails, then pointers within the task structure
1717 * can be stale and must not be dereferenced.
1719 static inline int pid_alive(struct task_struct *p)
1721 return p->pids[PIDTYPE_PID].pid != NULL;
1725 * is_global_init - check if a task structure is init
1726 * @tsk: Task structure to be checked.
1728 * Check if a task structure is the first user space task the kernel created.
1730 static inline int is_global_init(struct task_struct *tsk)
1732 return tsk->pid == 1;
1736 * is_container_init:
1737 * check whether in the task is init in its own pid namespace.
1739 extern int is_container_init(struct task_struct *tsk);
1741 extern struct pid *cad_pid;
1743 extern void free_task(struct task_struct *tsk);
1744 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1746 extern void __put_task_struct(struct task_struct *t);
1748 static inline void put_task_struct(struct task_struct *t)
1750 if (atomic_dec_and_test(&t->usage))
1751 __put_task_struct(t);
1754 extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
1755 extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
1760 #define PF_EXITING 0x00000004 /* getting shut down */
1761 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1762 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1763 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1764 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1765 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1766 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1767 #define PF_DUMPCORE 0x00000200 /* dumped core */
1768 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1769 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1770 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1771 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1772 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1773 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1774 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1775 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1776 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1777 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1778 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1779 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1780 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1781 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1782 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1783 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1784 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1785 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1786 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1789 * Only the _current_ task can read/write to tsk->flags, but other
1790 * tasks can access tsk->flags in readonly mode for example
1791 * with tsk_used_math (like during threaded core dumping).
1792 * There is however an exception to this rule during ptrace
1793 * or during fork: the ptracer task is allowed to write to the
1794 * child->flags of its traced child (same goes for fork, the parent
1795 * can write to the child->flags), because we're guaranteed the
1796 * child is not running and in turn not changing child->flags
1797 * at the same time the parent does it.
1799 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1800 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1801 #define clear_used_math() clear_stopped_child_used_math(current)
1802 #define set_used_math() set_stopped_child_used_math(current)
1803 #define conditional_stopped_child_used_math(condition, child) \
1804 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1805 #define conditional_used_math(condition) \
1806 conditional_stopped_child_used_math(condition, current)
1807 #define copy_to_stopped_child_used_math(child) \
1808 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1809 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1810 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1811 #define used_math() tsk_used_math(current)
1814 * task->jobctl flags
1816 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1818 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1819 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1820 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1821 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1822 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1823 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1824 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1826 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1827 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
1828 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
1829 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
1830 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
1831 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
1832 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
1834 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1835 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
1837 extern bool task_set_jobctl_pending(struct task_struct *task,
1839 extern void task_clear_jobctl_trapping(struct task_struct *task);
1840 extern void task_clear_jobctl_pending(struct task_struct *task,
1843 #ifdef CONFIG_PREEMPT_RCU
1845 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1846 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1848 static inline void rcu_copy_process(struct task_struct *p)
1850 p->rcu_read_lock_nesting = 0;
1851 p->rcu_read_unlock_special = 0;
1852 #ifdef CONFIG_TREE_PREEMPT_RCU
1853 p->rcu_blocked_node = NULL;
1854 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1855 #ifdef CONFIG_RCU_BOOST
1856 p->rcu_boost_mutex = NULL;
1857 #endif /* #ifdef CONFIG_RCU_BOOST */
1858 INIT_LIST_HEAD(&p->rcu_node_entry);
1863 static inline void rcu_copy_process(struct task_struct *p)
1869 static inline void rcu_switch(struct task_struct *prev,
1870 struct task_struct *next)
1872 #ifdef CONFIG_RCU_USER_QS
1873 rcu_user_hooks_switch(prev, next);
1877 static inline void tsk_restore_flags(struct task_struct *task,
1878 unsigned long orig_flags, unsigned long flags)
1880 task->flags &= ~flags;
1881 task->flags |= orig_flags & flags;
1885 extern void do_set_cpus_allowed(struct task_struct *p,
1886 const struct cpumask *new_mask);
1888 extern int set_cpus_allowed_ptr(struct task_struct *p,
1889 const struct cpumask *new_mask);
1891 static inline void do_set_cpus_allowed(struct task_struct *p,
1892 const struct cpumask *new_mask)
1895 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1896 const struct cpumask *new_mask)
1898 if (!cpumask_test_cpu(0, new_mask))
1905 void calc_load_enter_idle(void);
1906 void calc_load_exit_idle(void);
1908 static inline void calc_load_enter_idle(void) { }
1909 static inline void calc_load_exit_idle(void) { }
1910 #endif /* CONFIG_NO_HZ */
1912 #ifndef CONFIG_CPUMASK_OFFSTACK
1913 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1915 return set_cpus_allowed_ptr(p, &new_mask);
1920 * Do not use outside of architecture code which knows its limitations.
1922 * sched_clock() has no promise of monotonicity or bounded drift between
1923 * CPUs, use (which you should not) requires disabling IRQs.
1925 * Please use one of the three interfaces below.
1927 extern unsigned long long notrace sched_clock(void);
1929 * See the comment in kernel/sched/clock.c
1931 extern u64 cpu_clock(int cpu);
1932 extern u64 local_clock(void);
1933 extern u64 sched_clock_cpu(int cpu);
1936 extern void sched_clock_init(void);
1938 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1939 static inline void sched_clock_tick(void)
1943 static inline void sched_clock_idle_sleep_event(void)
1947 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1952 * Architectures can set this to 1 if they have specified
1953 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1954 * but then during bootup it turns out that sched_clock()
1955 * is reliable after all:
1957 extern int sched_clock_stable;
1959 extern void sched_clock_tick(void);
1960 extern void sched_clock_idle_sleep_event(void);
1961 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1964 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1966 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1967 * The reason for this explicit opt-in is not to have perf penalty with
1968 * slow sched_clocks.
1970 extern void enable_sched_clock_irqtime(void);
1971 extern void disable_sched_clock_irqtime(void);
1973 static inline void enable_sched_clock_irqtime(void) {}
1974 static inline void disable_sched_clock_irqtime(void) {}
1977 extern unsigned long long
1978 task_sched_runtime(struct task_struct *task);
1980 /* sched_exec is called by processes performing an exec */
1982 extern void sched_exec(void);
1984 #define sched_exec() {}
1987 extern void sched_clock_idle_sleep_event(void);
1988 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1990 #ifdef CONFIG_HOTPLUG_CPU
1991 extern void idle_task_exit(void);
1993 static inline void idle_task_exit(void) {}
1996 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1997 extern void wake_up_idle_cpu(int cpu);
1999 static inline void wake_up_idle_cpu(int cpu) { }
2002 extern unsigned int sysctl_sched_latency;
2003 extern unsigned int sysctl_sched_min_granularity;
2004 extern unsigned int sysctl_sched_wakeup_granularity;
2005 extern unsigned int sysctl_sched_child_runs_first;
2007 enum sched_tunable_scaling {
2008 SCHED_TUNABLESCALING_NONE,
2009 SCHED_TUNABLESCALING_LOG,
2010 SCHED_TUNABLESCALING_LINEAR,
2011 SCHED_TUNABLESCALING_END,
2013 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
2015 #ifdef CONFIG_SCHED_DEBUG
2016 extern unsigned int sysctl_sched_migration_cost;
2017 extern unsigned int sysctl_sched_nr_migrate;
2018 extern unsigned int sysctl_sched_time_avg;
2019 extern unsigned int sysctl_timer_migration;
2020 extern unsigned int sysctl_sched_shares_window;
2022 int sched_proc_update_handler(struct ctl_table *table, int write,
2023 void __user *buffer, size_t *length,
2026 #ifdef CONFIG_SCHED_DEBUG
2027 static inline unsigned int get_sysctl_timer_migration(void)
2029 return sysctl_timer_migration;
2032 static inline unsigned int get_sysctl_timer_migration(void)
2037 extern unsigned int sysctl_sched_rt_period;
2038 extern int sysctl_sched_rt_runtime;
2040 int sched_rt_handler(struct ctl_table *table, int write,
2041 void __user *buffer, size_t *lenp,
2044 #ifdef CONFIG_SCHED_AUTOGROUP
2045 extern unsigned int sysctl_sched_autogroup_enabled;
2047 extern void sched_autogroup_create_attach(struct task_struct *p);
2048 extern void sched_autogroup_detach(struct task_struct *p);
2049 extern void sched_autogroup_fork(struct signal_struct *sig);
2050 extern void sched_autogroup_exit(struct signal_struct *sig);
2051 #ifdef CONFIG_PROC_FS
2052 extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
2053 extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
2056 static inline void sched_autogroup_create_attach(struct task_struct *p) { }
2057 static inline void sched_autogroup_detach(struct task_struct *p) { }
2058 static inline void sched_autogroup_fork(struct signal_struct *sig) { }
2059 static inline void sched_autogroup_exit(struct signal_struct *sig) { }
2062 #ifdef CONFIG_CFS_BANDWIDTH
2063 extern unsigned int sysctl_sched_cfs_bandwidth_slice;
2066 #ifdef CONFIG_RT_MUTEXES
2067 extern int rt_mutex_getprio(struct task_struct *p);
2068 extern void rt_mutex_setprio(struct task_struct *p, int prio);
2069 extern void rt_mutex_adjust_pi(struct task_struct *p);
2070 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
2072 return tsk->pi_blocked_on != NULL;
2075 static inline int rt_mutex_getprio(struct task_struct *p)
2077 return p->normal_prio;
2079 # define rt_mutex_adjust_pi(p) do { } while (0)
2080 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
2086 extern bool yield_to(struct task_struct *p, bool preempt);
2087 extern void set_user_nice(struct task_struct *p, long nice);
2088 extern int task_prio(const struct task_struct *p);
2089 extern int task_nice(const struct task_struct *p);
2090 extern int can_nice(const struct task_struct *p, const int nice);
2091 extern int task_curr(const struct task_struct *p);
2092 extern int idle_cpu(int cpu);
2093 extern int sched_setscheduler(struct task_struct *, int,
2094 const struct sched_param *);
2095 extern int sched_setscheduler_nocheck(struct task_struct *, int,
2096 const struct sched_param *);
2097 extern struct task_struct *idle_task(int cpu);
2099 * is_idle_task - is the specified task an idle task?
2100 * @p: the task in question.
2102 static inline bool is_idle_task(const struct task_struct *p)
2106 extern struct task_struct *curr_task(int cpu);
2107 extern void set_curr_task(int cpu, struct task_struct *p);
2112 * The default (Linux) execution domain.
2114 extern struct exec_domain default_exec_domain;
2116 union thread_union {
2117 struct thread_info thread_info;
2118 unsigned long stack[THREAD_SIZE/sizeof(long)];
2121 #ifndef __HAVE_ARCH_KSTACK_END
2122 static inline int kstack_end(void *addr)
2124 /* Reliable end of stack detection:
2125 * Some APM bios versions misalign the stack
2127 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
2131 extern union thread_union init_thread_union;
2132 extern struct task_struct init_task;
2134 extern struct mm_struct init_mm;
2136 extern struct pid_namespace init_pid_ns;
2139 * find a task by one of its numerical ids
2141 * find_task_by_pid_ns():
2142 * finds a task by its pid in the specified namespace
2143 * find_task_by_vpid():
2144 * finds a task by its virtual pid
2146 * see also find_vpid() etc in include/linux/pid.h
2149 extern struct task_struct *find_task_by_vpid(pid_t nr);
2150 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2151 struct pid_namespace *ns);
2153 extern void __set_special_pids(struct pid *pid);
2155 /* per-UID process charging. */
2156 extern struct user_struct * alloc_uid(kuid_t);
2157 static inline struct user_struct *get_uid(struct user_struct *u)
2159 atomic_inc(&u->__count);
2162 extern void free_uid(struct user_struct *);
2164 #include <asm/current.h>
2166 extern void xtime_update(unsigned long ticks);
2168 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2169 extern int wake_up_process(struct task_struct *tsk);
2170 extern void wake_up_new_task(struct task_struct *tsk);
2172 extern void kick_process(struct task_struct *tsk);
2174 static inline void kick_process(struct task_struct *tsk) { }
2176 extern void sched_fork(struct task_struct *p);
2177 extern void sched_dead(struct task_struct *p);
2179 extern void proc_caches_init(void);
2180 extern void flush_signals(struct task_struct *);
2181 extern void __flush_signals(struct task_struct *);
2182 extern void ignore_signals(struct task_struct *);
2183 extern void flush_signal_handlers(struct task_struct *, int force_default);
2184 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2186 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2188 unsigned long flags;
2191 spin_lock_irqsave(&tsk->sighand->siglock, flags);
2192 ret = dequeue_signal(tsk, mask, info);
2193 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2198 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2200 extern void unblock_all_signals(void);
2201 extern void release_task(struct task_struct * p);
2202 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2203 extern int force_sigsegv(int, struct task_struct *);
2204 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2205 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2206 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2207 extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
2208 const struct cred *, u32);
2209 extern int kill_pgrp(struct pid *pid, int sig, int priv);
2210 extern int kill_pid(struct pid *pid, int sig, int priv);
2211 extern int kill_proc_info(int, struct siginfo *, pid_t);
2212 extern __must_check bool do_notify_parent(struct task_struct *, int);
2213 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2214 extern void force_sig(int, struct task_struct *);
2215 extern int send_sig(int, struct task_struct *, int);
2216 extern int zap_other_threads(struct task_struct *p);
2217 extern struct sigqueue *sigqueue_alloc(void);
2218 extern void sigqueue_free(struct sigqueue *);
2219 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
2220 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2221 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
2223 static inline void restore_saved_sigmask(void)
2225 if (test_and_clear_restore_sigmask())
2226 __set_current_blocked(¤t->saved_sigmask);
2229 static inline sigset_t *sigmask_to_save(void)
2231 sigset_t *res = ¤t->blocked;
2232 if (unlikely(test_restore_sigmask()))
2233 res = ¤t->saved_sigmask;
2237 static inline int kill_cad_pid(int sig, int priv)
2239 return kill_pid(cad_pid, sig, priv);
2242 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2243 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2244 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2245 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2248 * True if we are on the alternate signal stack.
2250 static inline int on_sig_stack(unsigned long sp)
2252 #ifdef CONFIG_STACK_GROWSUP
2253 return sp >= current->sas_ss_sp &&
2254 sp - current->sas_ss_sp < current->sas_ss_size;
2256 return sp > current->sas_ss_sp &&
2257 sp - current->sas_ss_sp <= current->sas_ss_size;
2261 static inline int sas_ss_flags(unsigned long sp)
2263 return (current->sas_ss_size == 0 ? SS_DISABLE
2264 : on_sig_stack(sp) ? SS_ONSTACK : 0);
2268 * Routines for handling mm_structs
2270 extern struct mm_struct * mm_alloc(void);
2272 /* mmdrop drops the mm and the page tables */
2273 extern void __mmdrop(struct mm_struct *);
2274 static inline void mmdrop(struct mm_struct * mm)
2276 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2280 /* mmput gets rid of the mappings and all user-space */
2281 extern void mmput(struct mm_struct *);
2282 /* Grab a reference to a task's mm, if it is not already going away */
2283 extern struct mm_struct *get_task_mm(struct task_struct *task);
2285 * Grab a reference to a task's mm, if it is not already going away
2286 * and ptrace_may_access with the mode parameter passed to it
2289 extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
2290 /* Remove the current tasks stale references to the old mm_struct */
2291 extern void mm_release(struct task_struct *, struct mm_struct *);
2292 /* Allocate a new mm structure and copy contents from tsk->mm */
2293 extern struct mm_struct *dup_mm(struct task_struct *tsk);
2295 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2296 struct task_struct *, struct pt_regs *);
2297 extern void flush_thread(void);
2298 extern void exit_thread(void);
2300 extern void exit_files(struct task_struct *);
2301 extern void __cleanup_sighand(struct sighand_struct *);
2303 extern void exit_itimers(struct signal_struct *);
2304 extern void flush_itimer_signals(void);
2306 extern void do_group_exit(int);
2308 extern void daemonize(const char *, ...);
2309 extern int allow_signal(int);
2310 extern int disallow_signal(int);
2312 extern int do_execve(const char *,
2313 const char __user * const __user *,
2314 const char __user * const __user *, struct pt_regs *);
2315 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
2316 struct task_struct *fork_idle(int);
2317 #ifdef CONFIG_GENERIC_KERNEL_THREAD
2318 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
2321 extern void set_task_comm(struct task_struct *tsk, char *from);
2322 extern char *get_task_comm(char *to, struct task_struct *tsk);
2325 void scheduler_ipi(void);
2326 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2328 static inline void scheduler_ipi(void) { }
2329 static inline unsigned long wait_task_inactive(struct task_struct *p,
2336 #define next_task(p) \
2337 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2339 #define for_each_process(p) \
2340 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2342 extern bool current_is_single_threaded(void);
2345 * Careful: do_each_thread/while_each_thread is a double loop so
2346 * 'break' will not work as expected - use goto instead.
2348 #define do_each_thread(g, t) \
2349 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2351 #define while_each_thread(g, t) \
2352 while ((t = next_thread(t)) != g)
2354 static inline int get_nr_threads(struct task_struct *tsk)
2356 return tsk->signal->nr_threads;
2359 static inline bool thread_group_leader(struct task_struct *p)
2361 return p->exit_signal >= 0;
2364 /* Do to the insanities of de_thread it is possible for a process
2365 * to have the pid of the thread group leader without actually being
2366 * the thread group leader. For iteration through the pids in proc
2367 * all we care about is that we have a task with the appropriate
2368 * pid, we don't actually care if we have the right task.
2370 static inline int has_group_leader_pid(struct task_struct *p)
2372 return p->pid == p->tgid;
2376 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2378 return p1->tgid == p2->tgid;
2381 static inline struct task_struct *next_thread(const struct task_struct *p)
2383 return list_entry_rcu(p->thread_group.next,
2384 struct task_struct, thread_group);
2387 static inline int thread_group_empty(struct task_struct *p)
2389 return list_empty(&p->thread_group);
2392 #define delay_group_leader(p) \
2393 (thread_group_leader(p) && !thread_group_empty(p))
2396 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2397 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2398 * pins the final release of task.io_context. Also protects ->cpuset and
2399 * ->cgroup.subsys[]. And ->vfork_done.
2401 * Nests both inside and outside of read_lock(&tasklist_lock).
2402 * It must not be nested with write_lock_irq(&tasklist_lock),
2403 * neither inside nor outside.
2405 static inline void task_lock(struct task_struct *p)
2407 spin_lock(&p->alloc_lock);
2410 static inline void task_unlock(struct task_struct *p)
2412 spin_unlock(&p->alloc_lock);
2415 extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2416 unsigned long *flags);
2418 static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2419 unsigned long *flags)
2421 struct sighand_struct *ret;
2423 ret = __lock_task_sighand(tsk, flags);
2424 (void)__cond_lock(&tsk->sighand->siglock, ret);
2428 static inline void unlock_task_sighand(struct task_struct *tsk,
2429 unsigned long *flags)
2431 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2434 #ifdef CONFIG_CGROUPS
2435 static inline void threadgroup_change_begin(struct task_struct *tsk)
2437 down_read(&tsk->signal->group_rwsem);
2439 static inline void threadgroup_change_end(struct task_struct *tsk)
2441 up_read(&tsk->signal->group_rwsem);
2445 * threadgroup_lock - lock threadgroup
2446 * @tsk: member task of the threadgroup to lock
2448 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2449 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2450 * perform exec. This is useful for cases where the threadgroup needs to
2451 * stay stable across blockable operations.
2453 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2454 * synchronization. While held, no new task will be added to threadgroup
2455 * and no existing live task will have its PF_EXITING set.
2457 * During exec, a task goes and puts its thread group through unusual
2458 * changes. After de-threading, exclusive access is assumed to resources
2459 * which are usually shared by tasks in the same group - e.g. sighand may
2460 * be replaced with a new one. Also, the exec'ing task takes over group
2461 * leader role including its pid. Exclude these changes while locked by
2462 * grabbing cred_guard_mutex which is used to synchronize exec path.
2464 static inline void threadgroup_lock(struct task_struct *tsk)
2467 * exec uses exit for de-threading nesting group_rwsem inside
2468 * cred_guard_mutex. Grab cred_guard_mutex first.
2470 mutex_lock(&tsk->signal->cred_guard_mutex);
2471 down_write(&tsk->signal->group_rwsem);
2475 * threadgroup_unlock - unlock threadgroup
2476 * @tsk: member task of the threadgroup to unlock
2478 * Reverse threadgroup_lock().
2480 static inline void threadgroup_unlock(struct task_struct *tsk)
2482 up_write(&tsk->signal->group_rwsem);
2483 mutex_unlock(&tsk->signal->cred_guard_mutex);
2486 static inline void threadgroup_change_begin(struct task_struct *tsk) {}
2487 static inline void threadgroup_change_end(struct task_struct *tsk) {}
2488 static inline void threadgroup_lock(struct task_struct *tsk) {}
2489 static inline void threadgroup_unlock(struct task_struct *tsk) {}
2492 #ifndef __HAVE_THREAD_FUNCTIONS
2494 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2495 #define task_stack_page(task) ((task)->stack)
2497 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2499 *task_thread_info(p) = *task_thread_info(org);
2500 task_thread_info(p)->task = p;
2503 static inline unsigned long *end_of_stack(struct task_struct *p)
2505 return (unsigned long *)(task_thread_info(p) + 1);
2510 static inline int object_is_on_stack(void *obj)
2512 void *stack = task_stack_page(current);
2514 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2517 extern void thread_info_cache_init(void);
2519 #ifdef CONFIG_DEBUG_STACK_USAGE
2520 static inline unsigned long stack_not_used(struct task_struct *p)
2522 unsigned long *n = end_of_stack(p);
2524 do { /* Skip over canary */
2528 return (unsigned long)n - (unsigned long)end_of_stack(p);
2532 /* set thread flags in other task's structures
2533 * - see asm/thread_info.h for TIF_xxxx flags available
2535 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2537 set_ti_thread_flag(task_thread_info(tsk), flag);
2540 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2542 clear_ti_thread_flag(task_thread_info(tsk), flag);
2545 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2547 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2550 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2552 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2555 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2557 return test_ti_thread_flag(task_thread_info(tsk), flag);
2560 static inline void set_tsk_need_resched(struct task_struct *tsk)
2562 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2565 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2567 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2570 static inline int test_tsk_need_resched(struct task_struct *tsk)
2572 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2575 static inline int restart_syscall(void)
2577 set_tsk_thread_flag(current, TIF_SIGPENDING);
2578 return -ERESTARTNOINTR;
2581 static inline int signal_pending(struct task_struct *p)
2583 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2586 static inline int __fatal_signal_pending(struct task_struct *p)
2588 return unlikely(sigismember(&p->pending.signal, SIGKILL));
2591 static inline int fatal_signal_pending(struct task_struct *p)
2593 return signal_pending(p) && __fatal_signal_pending(p);
2596 static inline int signal_pending_state(long state, struct task_struct *p)
2598 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2600 if (!signal_pending(p))
2603 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2606 static inline int need_resched(void)
2608 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2612 * cond_resched() and cond_resched_lock(): latency reduction via
2613 * explicit rescheduling in places that are safe. The return
2614 * value indicates whether a reschedule was done in fact.
2615 * cond_resched_lock() will drop the spinlock before scheduling,
2616 * cond_resched_softirq() will enable bhs before scheduling.
2618 extern int _cond_resched(void);
2620 #define cond_resched() ({ \
2621 __might_sleep(__FILE__, __LINE__, 0); \
2625 extern int __cond_resched_lock(spinlock_t *lock);
2627 #ifdef CONFIG_PREEMPT_COUNT
2628 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2630 #define PREEMPT_LOCK_OFFSET 0
2633 #define cond_resched_lock(lock) ({ \
2634 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2635 __cond_resched_lock(lock); \
2638 extern int __cond_resched_softirq(void);
2640 #define cond_resched_softirq() ({ \
2641 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2642 __cond_resched_softirq(); \
2646 * Does a critical section need to be broken due to another
2647 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2648 * but a general need for low latency)
2650 static inline int spin_needbreak(spinlock_t *lock)
2652 #ifdef CONFIG_PREEMPT
2653 return spin_is_contended(lock);
2660 * Thread group CPU time accounting.
2662 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2663 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2665 static inline void thread_group_cputime_init(struct signal_struct *sig)
2667 raw_spin_lock_init(&sig->cputimer.lock);
2671 * Reevaluate whether the task has signals pending delivery.
2672 * Wake the task if so.
2673 * This is required every time the blocked sigset_t changes.
2674 * callers must hold sighand->siglock.
2676 extern void recalc_sigpending_and_wake(struct task_struct *t);
2677 extern void recalc_sigpending(void);
2679 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2682 * Wrappers for p->thread_info->cpu access. No-op on UP.
2686 static inline unsigned int task_cpu(const struct task_struct *p)
2688 return task_thread_info(p)->cpu;
2691 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2695 static inline unsigned int task_cpu(const struct task_struct *p)
2700 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2704 #endif /* CONFIG_SMP */
2706 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2707 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2709 extern void normalize_rt_tasks(void);
2711 #ifdef CONFIG_CGROUP_SCHED
2713 extern struct task_group root_task_group;
2715 extern struct task_group *sched_create_group(struct task_group *parent);
2716 extern void sched_destroy_group(struct task_group *tg);
2717 extern void sched_move_task(struct task_struct *tsk);
2718 #ifdef CONFIG_FAIR_GROUP_SCHED
2719 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2720 extern unsigned long sched_group_shares(struct task_group *tg);
2722 #ifdef CONFIG_RT_GROUP_SCHED
2723 extern int sched_group_set_rt_runtime(struct task_group *tg,
2724 long rt_runtime_us);
2725 extern long sched_group_rt_runtime(struct task_group *tg);
2726 extern int sched_group_set_rt_period(struct task_group *tg,
2728 extern long sched_group_rt_period(struct task_group *tg);
2729 extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2731 #endif /* CONFIG_CGROUP_SCHED */
2733 extern int task_can_switch_user(struct user_struct *up,
2734 struct task_struct *tsk);
2736 #ifdef CONFIG_TASK_XACCT
2737 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2739 tsk->ioac.rchar += amt;
2742 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2744 tsk->ioac.wchar += amt;
2747 static inline void inc_syscr(struct task_struct *tsk)
2752 static inline void inc_syscw(struct task_struct *tsk)
2757 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2761 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2765 static inline void inc_syscr(struct task_struct *tsk)
2769 static inline void inc_syscw(struct task_struct *tsk)
2774 #ifndef TASK_SIZE_OF
2775 #define TASK_SIZE_OF(tsk) TASK_SIZE
2778 #ifdef CONFIG_MM_OWNER
2779 extern void mm_update_next_owner(struct mm_struct *mm);
2780 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2782 static inline void mm_update_next_owner(struct mm_struct *mm)
2786 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2789 #endif /* CONFIG_MM_OWNER */
2791 static inline unsigned long task_rlimit(const struct task_struct *tsk,
2794 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2797 static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2800 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2803 static inline unsigned long rlimit(unsigned int limit)
2805 return task_rlimit(current, limit);
2808 static inline unsigned long rlimit_max(unsigned int limit)
2810 return task_rlimit_max(current, limit);