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>
54 #include <linux/gfp.h>
56 #include <asm/processor.h>
59 struct futex_pi_state;
60 struct robust_list_head;
63 struct perf_event_context;
67 * List of flags we want to share for kernel threads,
68 * if only because they are not used by them anyway.
70 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
73 * These are the constant used to fake the fixed-point load-average
74 * counting. Some notes:
75 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
76 * a load-average precision of 10 bits integer + 11 bits fractional
77 * - if you want to count load-averages more often, you need more
78 * precision, or rounding will get you. With 2-second counting freq,
79 * the EXP_n values would be 1981, 2034 and 2043 if still using only
82 extern unsigned long avenrun[]; /* Load averages */
83 extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
85 #define FSHIFT 11 /* nr of bits of precision */
86 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
87 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
88 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
89 #define EXP_5 2014 /* 1/exp(5sec/5min) */
90 #define EXP_15 2037 /* 1/exp(5sec/15min) */
92 #define CALC_LOAD(load,exp,n) \
94 load += n*(FIXED_1-exp); \
97 extern unsigned long total_forks;
98 extern int nr_threads;
99 DECLARE_PER_CPU(unsigned long, process_counts);
100 extern int nr_processes(void);
101 extern unsigned long nr_running(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 /* Notifier for when a task gets migrated to a new CPU */
111 struct task_migration_notifier {
112 struct task_struct *task;
116 extern void register_task_migration_notifier(struct notifier_block *n);
118 extern unsigned long get_parent_ip(unsigned long addr);
120 extern void dump_cpu_task(int cpu);
125 #ifdef CONFIG_SCHED_DEBUG
126 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
127 extern void proc_sched_set_task(struct task_struct *p);
129 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
133 * Task state bitmask. NOTE! These bits are also
134 * encoded in fs/proc/array.c: get_task_state().
136 * We have two separate sets of flags: task->state
137 * is about runnability, while task->exit_state are
138 * about the task exiting. Confusing, but this way
139 * modifying one set can't modify the other one by
142 #define TASK_RUNNING 0
143 #define TASK_INTERRUPTIBLE 1
144 #define TASK_UNINTERRUPTIBLE 2
145 #define __TASK_STOPPED 4
146 #define __TASK_TRACED 8
147 /* in tsk->exit_state */
148 #define EXIT_ZOMBIE 16
150 /* in tsk->state again */
152 #define TASK_WAKEKILL 128
153 #define TASK_WAKING 256
154 #define TASK_STATE_MAX 512
156 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
158 extern char ___assert_task_state[1 - 2*!!(
159 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
161 /* Convenience macros for the sake of set_task_state */
162 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
163 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
164 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
166 /* Convenience macros for the sake of wake_up */
167 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
168 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
170 /* get_task_state() */
171 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
172 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
175 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
176 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
177 #define task_is_dead(task) ((task)->exit_state != 0)
178 #define task_is_stopped_or_traced(task) \
179 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
180 #define task_contributes_to_load(task) \
181 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
182 (task->flags & PF_FROZEN) == 0)
184 #define __set_task_state(tsk, state_value) \
185 do { (tsk)->state = (state_value); } while (0)
186 #define set_task_state(tsk, state_value) \
187 set_mb((tsk)->state, (state_value))
190 * set_current_state() includes a barrier so that the write of current->state
191 * is correctly serialised wrt the caller's subsequent test of whether to
194 * set_current_state(TASK_UNINTERRUPTIBLE);
195 * if (do_i_need_to_sleep())
198 * If the caller does not need such serialisation then use __set_current_state()
200 #define __set_current_state(state_value) \
201 do { current->state = (state_value); } while (0)
202 #define set_current_state(state_value) \
203 set_mb(current->state, (state_value))
205 /* Task command name length */
206 #define TASK_COMM_LEN 16
208 #include <linux/spinlock.h>
211 * This serializes "schedule()" and also protects
212 * the run-queue from deletions/modifications (but
213 * _adding_ to the beginning of the run-queue has
216 extern rwlock_t tasklist_lock;
217 extern spinlock_t mmlist_lock;
221 #ifdef CONFIG_PROVE_RCU
222 extern int lockdep_tasklist_lock_is_held(void);
223 #endif /* #ifdef CONFIG_PROVE_RCU */
225 extern void sched_init(void);
226 extern void sched_init_smp(void);
227 extern asmlinkage void schedule_tail(struct task_struct *prev);
228 extern void init_idle(struct task_struct *idle, int cpu);
229 extern void init_idle_bootup_task(struct task_struct *idle);
231 extern int runqueue_is_locked(int cpu);
233 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
234 extern void nohz_balance_enter_idle(int cpu);
235 extern void set_cpu_sd_state_idle(void);
236 extern int get_nohz_timer_target(void);
238 static inline void nohz_balance_enter_idle(int cpu) { }
239 static inline void set_cpu_sd_state_idle(void) { }
243 * Only dump TASK_* tasks. (0 for all tasks)
245 extern void show_state_filter(unsigned long state_filter);
247 static inline void show_state(void)
249 show_state_filter(0);
252 extern void show_regs(struct pt_regs *);
255 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
256 * task), SP is the stack pointer of the first frame that should be shown in the back
257 * trace (or NULL if the entire call-chain of the task should be shown).
259 extern void show_stack(struct task_struct *task, unsigned long *sp);
261 void io_schedule(void);
262 long io_schedule_timeout(long timeout);
264 extern void cpu_init (void);
265 extern void trap_init(void);
266 extern void update_process_times(int user);
267 extern void scheduler_tick(void);
269 extern void sched_show_task(struct task_struct *p);
271 #ifdef CONFIG_LOCKUP_DETECTOR
272 extern void touch_softlockup_watchdog(void);
273 extern void touch_softlockup_watchdog_sync(void);
274 extern void touch_all_softlockup_watchdogs(void);
275 extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
277 size_t *lenp, loff_t *ppos);
278 extern unsigned int softlockup_panic;
279 void lockup_detector_init(void);
281 static inline void touch_softlockup_watchdog(void)
284 static inline void touch_softlockup_watchdog_sync(void)
287 static inline void touch_all_softlockup_watchdogs(void)
290 static inline void lockup_detector_init(void)
295 /* Attach to any functions which should be ignored in wchan output. */
296 #define __sched __attribute__((__section__(".sched.text")))
298 /* Linker adds these: start and end of __sched functions */
299 extern char __sched_text_start[], __sched_text_end[];
301 /* Is this address in the __sched functions? */
302 extern int in_sched_functions(unsigned long addr);
304 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
305 extern signed long schedule_timeout(signed long timeout);
306 extern signed long schedule_timeout_interruptible(signed long timeout);
307 extern signed long schedule_timeout_killable(signed long timeout);
308 extern signed long schedule_timeout_uninterruptible(signed long timeout);
309 asmlinkage void schedule(void);
310 extern void schedule_preempt_disabled(void);
311 extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);
314 struct user_namespace;
316 #include <linux/aio.h>
319 extern void arch_pick_mmap_layout(struct mm_struct *mm);
321 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
322 unsigned long, unsigned long);
324 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
325 unsigned long len, unsigned long pgoff,
326 unsigned long flags);
327 extern void arch_unmap_area(struct mm_struct *, unsigned long);
328 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
330 static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
334 extern void set_dumpable(struct mm_struct *mm, int value);
335 extern int get_dumpable(struct mm_struct *mm);
339 #define MMF_DUMPABLE 0 /* core dump is permitted */
340 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
342 #define MMF_DUMPABLE_BITS 2
343 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
345 /* coredump filter bits */
346 #define MMF_DUMP_ANON_PRIVATE 2
347 #define MMF_DUMP_ANON_SHARED 3
348 #define MMF_DUMP_MAPPED_PRIVATE 4
349 #define MMF_DUMP_MAPPED_SHARED 5
350 #define MMF_DUMP_ELF_HEADERS 6
351 #define MMF_DUMP_HUGETLB_PRIVATE 7
352 #define MMF_DUMP_HUGETLB_SHARED 8
354 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
355 #define MMF_DUMP_FILTER_BITS 7
356 #define MMF_DUMP_FILTER_MASK \
357 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
358 #define MMF_DUMP_FILTER_DEFAULT \
359 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
360 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
362 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
363 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
365 # define MMF_DUMP_MASK_DEFAULT_ELF 0
367 /* leave room for more dump flags */
368 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
369 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
370 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
372 #define MMF_HAS_UPROBES 19 /* has uprobes */
373 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
375 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
377 struct sighand_struct {
379 struct k_sigaction action[_NSIG];
381 wait_queue_head_t signalfd_wqh;
384 struct pacct_struct {
387 unsigned long ac_mem;
388 cputime_t ac_utime, ac_stime;
389 unsigned long ac_minflt, ac_majflt;
400 * struct cputime - snaphsot of system and user cputime
401 * @utime: time spent in user mode
402 * @stime: time spent in system mode
404 * Gathers a generic snapshot of user and system time.
412 * struct task_cputime - collected CPU time counts
413 * @utime: time spent in user mode, in &cputime_t units
414 * @stime: time spent in kernel mode, in &cputime_t units
415 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
417 * This is an extension of struct cputime that includes the total runtime
418 * spent by the task from the scheduler point of view.
420 * As a result, this structure groups together three kinds of CPU time
421 * that are tracked for threads and thread groups. Most things considering
422 * CPU time want to group these counts together and treat all three
423 * of them in parallel.
425 struct task_cputime {
428 unsigned long long sum_exec_runtime;
430 /* Alternate field names when used to cache expirations. */
431 #define prof_exp stime
432 #define virt_exp utime
433 #define sched_exp sum_exec_runtime
435 #define INIT_CPUTIME \
436 (struct task_cputime) { \
439 .sum_exec_runtime = 0, \
443 * Disable preemption until the scheduler is running.
444 * Reset by start_kernel()->sched_init()->init_idle().
446 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
447 * before the scheduler is active -- see should_resched().
449 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
452 * struct thread_group_cputimer - thread group interval timer counts
453 * @cputime: thread group interval timers.
454 * @running: non-zero when there are timers running and
455 * @cputime receives updates.
456 * @lock: lock for fields in this struct.
458 * This structure contains the version of task_cputime, above, that is
459 * used for thread group CPU timer calculations.
461 struct thread_group_cputimer {
462 struct task_cputime cputime;
467 #include <linux/rwsem.h>
471 * NOTE! "signal_struct" does not have its own
472 * locking, because a shared signal_struct always
473 * implies a shared sighand_struct, so locking
474 * sighand_struct is always a proper superset of
475 * the locking of signal_struct.
477 struct signal_struct {
482 wait_queue_head_t wait_chldexit; /* for wait4() */
484 /* current thread group signal load-balancing target: */
485 struct task_struct *curr_target;
487 /* shared signal handling: */
488 struct sigpending shared_pending;
490 /* thread group exit support */
493 * - notify group_exit_task when ->count is equal to notify_count
494 * - everyone except group_exit_task is stopped during signal delivery
495 * of fatal signals, group_exit_task processes the signal.
498 struct task_struct *group_exit_task;
500 /* thread group stop support, overloads group_exit_code too */
501 int group_stop_count;
502 unsigned int flags; /* see SIGNAL_* flags below */
505 * PR_SET_CHILD_SUBREAPER marks a process, like a service
506 * manager, to re-parent orphan (double-forking) child processes
507 * to this process instead of 'init'. The service manager is
508 * able to receive SIGCHLD signals and is able to investigate
509 * the process until it calls wait(). All children of this
510 * process will inherit a flag if they should look for a
511 * child_subreaper process at exit.
513 unsigned int is_child_subreaper:1;
514 unsigned int has_child_subreaper:1;
516 /* POSIX.1b Interval Timers */
517 struct list_head posix_timers;
519 /* ITIMER_REAL timer for the process */
520 struct hrtimer real_timer;
521 struct pid *leader_pid;
522 ktime_t it_real_incr;
525 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
526 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
527 * values are defined to 0 and 1 respectively
529 struct cpu_itimer it[2];
532 * Thread group totals for process CPU timers.
533 * See thread_group_cputimer(), et al, for details.
535 struct thread_group_cputimer cputimer;
537 /* Earliest-expiration cache. */
538 struct task_cputime cputime_expires;
540 struct list_head cpu_timers[3];
542 struct pid *tty_old_pgrp;
544 /* boolean value for session group leader */
547 struct tty_struct *tty; /* NULL if no tty */
549 #ifdef CONFIG_SCHED_AUTOGROUP
550 struct autogroup *autogroup;
553 * Cumulative resource counters for dead threads in the group,
554 * and for reaped dead child processes forked by this group.
555 * Live threads maintain their own counters and add to these
556 * in __exit_signal, except for the group leader.
558 cputime_t utime, stime, cutime, cstime;
561 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
562 struct cputime prev_cputime;
564 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
565 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
566 unsigned long inblock, oublock, cinblock, coublock;
567 unsigned long maxrss, cmaxrss;
568 struct task_io_accounting ioac;
571 * Cumulative ns of schedule CPU time fo dead threads in the
572 * group, not including a zombie group leader, (This only differs
573 * from jiffies_to_ns(utime + stime) if sched_clock uses something
574 * other than jiffies.)
576 unsigned long long sum_sched_runtime;
579 * We don't bother to synchronize most readers of this at all,
580 * because there is no reader checking a limit that actually needs
581 * to get both rlim_cur and rlim_max atomically, and either one
582 * alone is a single word that can safely be read normally.
583 * getrlimit/setrlimit use task_lock(current->group_leader) to
584 * protect this instead of the siglock, because they really
585 * have no need to disable irqs.
587 struct rlimit rlim[RLIM_NLIMITS];
589 #ifdef CONFIG_BSD_PROCESS_ACCT
590 struct pacct_struct pacct; /* per-process accounting information */
592 #ifdef CONFIG_TASKSTATS
593 struct taskstats *stats;
597 struct tty_audit_buf *tty_audit_buf;
599 #ifdef CONFIG_CGROUPS
601 * group_rwsem prevents new tasks from entering the threadgroup and
602 * member tasks from exiting,a more specifically, setting of
603 * PF_EXITING. fork and exit paths are protected with this rwsem
604 * using threadgroup_change_begin/end(). Users which require
605 * threadgroup to remain stable should use threadgroup_[un]lock()
606 * which also takes care of exec path. Currently, cgroup is the
609 struct rw_semaphore group_rwsem;
612 oom_flags_t oom_flags;
613 short oom_score_adj; /* OOM kill score adjustment */
614 short oom_score_adj_min; /* OOM kill score adjustment min value.
615 * Only settable by CAP_SYS_RESOURCE. */
617 struct mutex cred_guard_mutex; /* guard against foreign influences on
618 * credential calculations
619 * (notably. ptrace) */
623 * Bits in flags field of signal_struct.
625 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
626 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
627 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
629 * Pending notifications to parent.
631 #define SIGNAL_CLD_STOPPED 0x00000010
632 #define SIGNAL_CLD_CONTINUED 0x00000020
633 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
635 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
637 /* If true, all threads except ->group_exit_task have pending SIGKILL */
638 static inline int signal_group_exit(const struct signal_struct *sig)
640 return (sig->flags & SIGNAL_GROUP_EXIT) ||
641 (sig->group_exit_task != NULL);
645 * Some day this will be a full-fledged user tracking system..
648 atomic_t __count; /* reference count */
649 atomic_t processes; /* How many processes does this user have? */
650 atomic_t files; /* How many open files does this user have? */
651 atomic_t sigpending; /* How many pending signals does this user have? */
652 #ifdef CONFIG_INOTIFY_USER
653 atomic_t inotify_watches; /* How many inotify watches does this user have? */
654 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
656 #ifdef CONFIG_FANOTIFY
657 atomic_t fanotify_listeners;
660 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
662 #ifdef CONFIG_POSIX_MQUEUE
663 /* protected by mq_lock */
664 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
666 unsigned long locked_shm; /* How many pages of mlocked shm ? */
669 struct key *uid_keyring; /* UID specific keyring */
670 struct key *session_keyring; /* UID's default session keyring */
673 /* Hash table maintenance information */
674 struct hlist_node uidhash_node;
677 #ifdef CONFIG_PERF_EVENTS
678 atomic_long_t locked_vm;
682 extern int uids_sysfs_init(void);
684 extern struct user_struct *find_user(kuid_t);
686 extern struct user_struct root_user;
687 #define INIT_USER (&root_user)
690 struct backing_dev_info;
691 struct reclaim_state;
693 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
695 /* cumulative counters */
696 unsigned long pcount; /* # of times run on this cpu */
697 unsigned long long run_delay; /* time spent waiting on a runqueue */
700 unsigned long long last_arrival,/* when we last ran on a cpu */
701 last_queued; /* when we were last queued to run */
703 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
705 #ifdef CONFIG_TASK_DELAY_ACCT
706 struct task_delay_info {
708 unsigned int flags; /* Private per-task flags */
710 /* For each stat XXX, add following, aligned appropriately
712 * struct timespec XXX_start, XXX_end;
716 * Atomicity of updates to XXX_delay, XXX_count protected by
717 * single lock above (split into XXX_lock if contention is an issue).
721 * XXX_count is incremented on every XXX operation, the delay
722 * associated with the operation is added to XXX_delay.
723 * XXX_delay contains the accumulated delay time in nanoseconds.
725 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
726 u64 blkio_delay; /* wait for sync block io completion */
727 u64 swapin_delay; /* wait for swapin block io completion */
728 u32 blkio_count; /* total count of the number of sync block */
729 /* io operations performed */
730 u32 swapin_count; /* total count of the number of swapin block */
731 /* io operations performed */
733 struct timespec freepages_start, freepages_end;
734 u64 freepages_delay; /* wait for memory reclaim */
735 u32 freepages_count; /* total count of memory reclaim */
737 #endif /* CONFIG_TASK_DELAY_ACCT */
739 static inline int sched_info_on(void)
741 #ifdef CONFIG_SCHEDSTATS
743 #elif defined(CONFIG_TASK_DELAY_ACCT)
744 extern int delayacct_on;
759 * Increase resolution of cpu_power calculations
761 #define SCHED_POWER_SHIFT 10
762 #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
765 * sched-domains (multiprocessor balancing) declarations:
768 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
769 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
770 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
771 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
772 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
773 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
774 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
775 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
776 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
777 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
778 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
779 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
781 extern int __weak arch_sd_sibiling_asym_packing(void);
783 struct sched_domain_attr {
784 int relax_domain_level;
787 #define SD_ATTR_INIT (struct sched_domain_attr) { \
788 .relax_domain_level = -1, \
791 extern int sched_domain_level_max;
795 struct sched_domain {
796 /* These fields must be setup */
797 struct sched_domain *parent; /* top domain must be null terminated */
798 struct sched_domain *child; /* bottom domain must be null terminated */
799 struct sched_group *groups; /* the balancing groups of the domain */
800 unsigned long min_interval; /* Minimum balance interval ms */
801 unsigned long max_interval; /* Maximum balance interval ms */
802 unsigned int busy_factor; /* less balancing by factor if busy */
803 unsigned int imbalance_pct; /* No balance until over watermark */
804 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
805 unsigned int busy_idx;
806 unsigned int idle_idx;
807 unsigned int newidle_idx;
808 unsigned int wake_idx;
809 unsigned int forkexec_idx;
810 unsigned int smt_gain;
811 int flags; /* See SD_* */
814 /* Runtime fields. */
815 unsigned long last_balance; /* init to jiffies. units in jiffies */
816 unsigned int balance_interval; /* initialise to 1. units in ms. */
817 unsigned int nr_balance_failed; /* initialise to 0 */
821 #ifdef CONFIG_SCHEDSTATS
822 /* load_balance() stats */
823 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
824 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
825 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
826 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
827 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
828 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
829 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
830 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
832 /* Active load balancing */
833 unsigned int alb_count;
834 unsigned int alb_failed;
835 unsigned int alb_pushed;
837 /* SD_BALANCE_EXEC stats */
838 unsigned int sbe_count;
839 unsigned int sbe_balanced;
840 unsigned int sbe_pushed;
842 /* SD_BALANCE_FORK stats */
843 unsigned int sbf_count;
844 unsigned int sbf_balanced;
845 unsigned int sbf_pushed;
847 /* try_to_wake_up() stats */
848 unsigned int ttwu_wake_remote;
849 unsigned int ttwu_move_affine;
850 unsigned int ttwu_move_balance;
852 #ifdef CONFIG_SCHED_DEBUG
856 void *private; /* used during construction */
857 struct rcu_head rcu; /* used during destruction */
860 unsigned int span_weight;
862 * Span of all CPUs in this domain.
864 * NOTE: this field is variable length. (Allocated dynamically
865 * by attaching extra space to the end of the structure,
866 * depending on how many CPUs the kernel has booted up with)
868 unsigned long span[0];
871 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
873 return to_cpumask(sd->span);
876 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
877 struct sched_domain_attr *dattr_new);
879 /* Allocate an array of sched domains, for partition_sched_domains(). */
880 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
881 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
883 unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
884 unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
886 bool cpus_share_cache(int this_cpu, int that_cpu);
888 #else /* CONFIG_SMP */
890 struct sched_domain_attr;
893 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
894 struct sched_domain_attr *dattr_new)
898 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
903 #endif /* !CONFIG_SMP */
906 struct io_context; /* See blkdev.h */
909 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
910 extern void prefetch_stack(struct task_struct *t);
912 static inline void prefetch_stack(struct task_struct *t) { }
915 struct audit_context; /* See audit.c */
917 struct pipe_inode_info;
918 struct uts_namespace;
923 #define ENQUEUE_WAKEUP 1
924 #define ENQUEUE_HEAD 2
926 #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */
928 #define ENQUEUE_WAKING 0
931 #define DEQUEUE_SLEEP 1
934 const struct sched_class *next;
936 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
937 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
938 void (*yield_task) (struct rq *rq);
939 bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt);
941 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
943 struct task_struct * (*pick_next_task) (struct rq *rq);
944 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
947 int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);
948 void (*migrate_task_rq)(struct task_struct *p, int next_cpu);
950 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
951 void (*post_schedule) (struct rq *this_rq);
952 void (*task_waking) (struct task_struct *task);
953 void (*task_woken) (struct rq *this_rq, struct task_struct *task);
955 void (*set_cpus_allowed)(struct task_struct *p,
956 const struct cpumask *newmask);
958 void (*rq_online)(struct rq *rq);
959 void (*rq_offline)(struct rq *rq);
962 void (*set_curr_task) (struct rq *rq);
963 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
964 void (*task_fork) (struct task_struct *p);
966 void (*switched_from) (struct rq *this_rq, struct task_struct *task);
967 void (*switched_to) (struct rq *this_rq, struct task_struct *task);
968 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
971 unsigned int (*get_rr_interval) (struct rq *rq,
972 struct task_struct *task);
974 #ifdef CONFIG_FAIR_GROUP_SCHED
975 void (*task_move_group) (struct task_struct *p, int on_rq);
980 unsigned long weight, inv_weight;
985 * These sums represent an infinite geometric series and so are bound
986 * above by 1024/(1-y). Thus we only need a u32 to store them for for all
987 * choices of y < 1-2^(-32)*1024.
989 u32 runnable_avg_sum, runnable_avg_period;
990 u64 last_runnable_update;
992 unsigned long load_avg_contrib;
995 #ifdef CONFIG_SCHEDSTATS
996 struct sched_statistics {
1006 s64 sum_sleep_runtime;
1013 u64 nr_migrations_cold;
1014 u64 nr_failed_migrations_affine;
1015 u64 nr_failed_migrations_running;
1016 u64 nr_failed_migrations_hot;
1017 u64 nr_forced_migrations;
1020 u64 nr_wakeups_sync;
1021 u64 nr_wakeups_migrate;
1022 u64 nr_wakeups_local;
1023 u64 nr_wakeups_remote;
1024 u64 nr_wakeups_affine;
1025 u64 nr_wakeups_affine_attempts;
1026 u64 nr_wakeups_passive;
1027 u64 nr_wakeups_idle;
1031 struct sched_entity {
1032 struct load_weight load; /* for load-balancing */
1033 struct rb_node run_node;
1034 struct list_head group_node;
1038 u64 sum_exec_runtime;
1040 u64 prev_sum_exec_runtime;
1044 #ifdef CONFIG_SCHEDSTATS
1045 struct sched_statistics statistics;
1048 #ifdef CONFIG_FAIR_GROUP_SCHED
1049 struct sched_entity *parent;
1050 /* rq on which this entity is (to be) queued: */
1051 struct cfs_rq *cfs_rq;
1052 /* rq "owned" by this entity/group: */
1053 struct cfs_rq *my_q;
1057 * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
1058 * removed when useful for applications beyond shares distribution (e.g.
1061 #if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
1062 /* Per-entity load-tracking */
1063 struct sched_avg avg;
1067 struct sched_rt_entity {
1068 struct list_head run_list;
1069 unsigned long timeout;
1070 unsigned long watchdog_stamp;
1071 unsigned int time_slice;
1073 struct sched_rt_entity *back;
1074 #ifdef CONFIG_RT_GROUP_SCHED
1075 struct sched_rt_entity *parent;
1076 /* rq on which this entity is (to be) queued: */
1077 struct rt_rq *rt_rq;
1078 /* rq "owned" by this entity/group: */
1086 enum perf_event_task_context {
1087 perf_invalid_context = -1,
1088 perf_hw_context = 0,
1090 perf_nr_task_contexts,
1093 struct task_struct {
1094 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1097 unsigned int flags; /* per process flags, defined below */
1098 unsigned int ptrace;
1101 struct llist_node wake_entry;
1106 int prio, static_prio, normal_prio;
1107 unsigned int rt_priority;
1108 const struct sched_class *sched_class;
1109 struct sched_entity se;
1110 struct sched_rt_entity rt;
1111 #ifdef CONFIG_CGROUP_SCHED
1112 struct task_group *sched_task_group;
1115 #ifdef CONFIG_PREEMPT_NOTIFIERS
1116 /* list of struct preempt_notifier: */
1117 struct hlist_head preempt_notifiers;
1121 * fpu_counter contains the number of consecutive context switches
1122 * that the FPU is used. If this is over a threshold, the lazy fpu
1123 * saving becomes unlazy to save the trap. This is an unsigned char
1124 * so that after 256 times the counter wraps and the behavior turns
1125 * lazy again; this to deal with bursty apps that only use FPU for
1128 unsigned char fpu_counter;
1129 #ifdef CONFIG_BLK_DEV_IO_TRACE
1130 unsigned int btrace_seq;
1133 unsigned int policy;
1134 int nr_cpus_allowed;
1135 cpumask_t cpus_allowed;
1137 #ifdef CONFIG_PREEMPT_RCU
1138 int rcu_read_lock_nesting;
1139 char rcu_read_unlock_special;
1140 struct list_head rcu_node_entry;
1141 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1142 #ifdef CONFIG_TREE_PREEMPT_RCU
1143 struct rcu_node *rcu_blocked_node;
1144 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1145 #ifdef CONFIG_RCU_BOOST
1146 struct rt_mutex *rcu_boost_mutex;
1147 #endif /* #ifdef CONFIG_RCU_BOOST */
1149 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1150 struct sched_info sched_info;
1153 struct list_head tasks;
1155 struct plist_node pushable_tasks;
1158 struct mm_struct *mm, *active_mm;
1159 #ifdef CONFIG_COMPAT_BRK
1160 unsigned brk_randomized:1;
1162 #if defined(SPLIT_RSS_COUNTING)
1163 struct task_rss_stat rss_stat;
1167 int exit_code, exit_signal;
1168 int pdeath_signal; /* The signal sent when the parent dies */
1169 unsigned int jobctl; /* JOBCTL_*, siglock protected */
1171 unsigned int personality;
1172 unsigned did_exec:1;
1173 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1175 unsigned in_iowait:1;
1177 /* task may not gain privileges */
1178 unsigned no_new_privs:1;
1180 /* Revert to default priority/policy when forking */
1181 unsigned sched_reset_on_fork:1;
1182 unsigned sched_contributes_to_load:1;
1187 #ifdef CONFIG_CC_STACKPROTECTOR
1188 /* Canary value for the -fstack-protector gcc feature */
1189 unsigned long stack_canary;
1192 * pointers to (original) parent process, youngest child, younger sibling,
1193 * older sibling, respectively. (p->father can be replaced with
1194 * p->real_parent->pid)
1196 struct task_struct __rcu *real_parent; /* real parent process */
1197 struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
1199 * children/sibling forms the list of my natural children
1201 struct list_head children; /* list of my children */
1202 struct list_head sibling; /* linkage in my parent's children list */
1203 struct task_struct *group_leader; /* threadgroup leader */
1206 * ptraced is the list of tasks this task is using ptrace on.
1207 * This includes both natural children and PTRACE_ATTACH targets.
1208 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1210 struct list_head ptraced;
1211 struct list_head ptrace_entry;
1213 /* PID/PID hash table linkage. */
1214 struct pid_link pids[PIDTYPE_MAX];
1215 struct list_head thread_group;
1217 struct completion *vfork_done; /* for vfork() */
1218 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1219 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1221 cputime_t utime, stime, utimescaled, stimescaled;
1223 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
1224 struct cputime prev_cputime;
1226 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1227 seqlock_t vtime_seqlock;
1228 unsigned long long vtime_snap;
1233 } vtime_snap_whence;
1235 unsigned long nvcsw, nivcsw; /* context switch counts */
1236 struct timespec start_time; /* monotonic time */
1237 struct timespec real_start_time; /* boot based time */
1238 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1239 unsigned long min_flt, maj_flt;
1241 struct task_cputime cputime_expires;
1242 struct list_head cpu_timers[3];
1244 /* process credentials */
1245 const struct cred __rcu *real_cred; /* objective and real subjective task
1246 * credentials (COW) */
1247 const struct cred __rcu *cred; /* effective (overridable) subjective task
1248 * credentials (COW) */
1249 char comm[TASK_COMM_LEN]; /* executable name excluding path
1250 - access with [gs]et_task_comm (which lock
1251 it with task_lock())
1252 - initialized normally by setup_new_exec */
1253 /* file system info */
1254 int link_count, total_link_count;
1255 #ifdef CONFIG_SYSVIPC
1257 struct sysv_sem sysvsem;
1259 #ifdef CONFIG_DETECT_HUNG_TASK
1260 /* hung task detection */
1261 unsigned long last_switch_count;
1263 /* CPU-specific state of this task */
1264 struct thread_struct thread;
1265 /* filesystem information */
1266 struct fs_struct *fs;
1267 /* open file information */
1268 struct files_struct *files;
1270 struct nsproxy *nsproxy;
1271 /* signal handlers */
1272 struct signal_struct *signal;
1273 struct sighand_struct *sighand;
1275 sigset_t blocked, real_blocked;
1276 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1277 struct sigpending pending;
1279 unsigned long sas_ss_sp;
1281 int (*notifier)(void *priv);
1282 void *notifier_data;
1283 sigset_t *notifier_mask;
1284 struct callback_head *task_works;
1286 struct audit_context *audit_context;
1287 #ifdef CONFIG_AUDITSYSCALL
1289 unsigned int sessionid;
1291 struct seccomp seccomp;
1293 /* Thread group tracking */
1296 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1298 spinlock_t alloc_lock;
1300 /* Protection of the PI data structures: */
1301 raw_spinlock_t pi_lock;
1303 #ifdef CONFIG_RT_MUTEXES
1304 /* PI waiters blocked on a rt_mutex held by this task */
1305 struct plist_head pi_waiters;
1306 /* Deadlock detection and priority inheritance handling */
1307 struct rt_mutex_waiter *pi_blocked_on;
1310 #ifdef CONFIG_DEBUG_MUTEXES
1311 /* mutex deadlock detection */
1312 struct mutex_waiter *blocked_on;
1314 #ifdef CONFIG_TRACE_IRQFLAGS
1315 unsigned int irq_events;
1316 unsigned long hardirq_enable_ip;
1317 unsigned long hardirq_disable_ip;
1318 unsigned int hardirq_enable_event;
1319 unsigned int hardirq_disable_event;
1320 int hardirqs_enabled;
1321 int hardirq_context;
1322 unsigned long softirq_disable_ip;
1323 unsigned long softirq_enable_ip;
1324 unsigned int softirq_disable_event;
1325 unsigned int softirq_enable_event;
1326 int softirqs_enabled;
1327 int softirq_context;
1329 #ifdef CONFIG_LOCKDEP
1330 # define MAX_LOCK_DEPTH 48UL
1333 unsigned int lockdep_recursion;
1334 struct held_lock held_locks[MAX_LOCK_DEPTH];
1335 gfp_t lockdep_reclaim_gfp;
1338 /* journalling filesystem info */
1341 /* stacked block device info */
1342 struct bio_list *bio_list;
1345 /* stack plugging */
1346 struct blk_plug *plug;
1350 struct reclaim_state *reclaim_state;
1352 struct backing_dev_info *backing_dev_info;
1354 struct io_context *io_context;
1356 unsigned long ptrace_message;
1357 siginfo_t *last_siginfo; /* For ptrace use. */
1358 struct task_io_accounting ioac;
1359 #if defined(CONFIG_TASK_XACCT)
1360 u64 acct_rss_mem1; /* accumulated rss usage */
1361 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1362 cputime_t acct_timexpd; /* stime + utime since last update */
1364 #ifdef CONFIG_CPUSETS
1365 nodemask_t mems_allowed; /* Protected by alloc_lock */
1366 seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
1367 int cpuset_mem_spread_rotor;
1368 int cpuset_slab_spread_rotor;
1370 #ifdef CONFIG_CGROUPS
1371 /* Control Group info protected by css_set_lock */
1372 struct css_set __rcu *cgroups;
1373 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1374 struct list_head cg_list;
1377 struct robust_list_head __user *robust_list;
1378 #ifdef CONFIG_COMPAT
1379 struct compat_robust_list_head __user *compat_robust_list;
1381 struct list_head pi_state_list;
1382 struct futex_pi_state *pi_state_cache;
1384 #ifdef CONFIG_PERF_EVENTS
1385 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1386 struct mutex perf_event_mutex;
1387 struct list_head perf_event_list;
1390 struct mempolicy *mempolicy; /* Protected by alloc_lock */
1392 short pref_node_fork;
1394 #ifdef CONFIG_NUMA_BALANCING
1396 int numa_migrate_seq;
1397 unsigned int numa_scan_period;
1398 u64 node_stamp; /* migration stamp */
1399 struct callback_head numa_work;
1400 #endif /* CONFIG_NUMA_BALANCING */
1402 struct rcu_head rcu;
1405 * cache last used pipe for splice
1407 struct pipe_inode_info *splice_pipe;
1409 struct page_frag task_frag;
1411 #ifdef CONFIG_TASK_DELAY_ACCT
1412 struct task_delay_info *delays;
1414 #ifdef CONFIG_FAULT_INJECTION
1418 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1419 * balance_dirty_pages() for some dirty throttling pause
1422 int nr_dirtied_pause;
1423 unsigned long dirty_paused_when; /* start of a write-and-pause period */
1425 #ifdef CONFIG_LATENCYTOP
1426 int latency_record_count;
1427 struct latency_record latency_record[LT_SAVECOUNT];
1430 * time slack values; these are used to round up poll() and
1431 * select() etc timeout values. These are in nanoseconds.
1433 unsigned long timer_slack_ns;
1434 unsigned long default_timer_slack_ns;
1436 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1437 /* Index of current stored address in ret_stack */
1439 /* Stack of return addresses for return function tracing */
1440 struct ftrace_ret_stack *ret_stack;
1441 /* time stamp for last schedule */
1442 unsigned long long ftrace_timestamp;
1444 * Number of functions that haven't been traced
1445 * because of depth overrun.
1447 atomic_t trace_overrun;
1448 /* Pause for the tracing */
1449 atomic_t tracing_graph_pause;
1451 #ifdef CONFIG_TRACING
1452 /* state flags for use by tracers */
1453 unsigned long trace;
1454 /* bitmask and counter of trace recursion */
1455 unsigned long trace_recursion;
1456 #endif /* CONFIG_TRACING */
1457 #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
1458 struct memcg_batch_info {
1459 int do_batch; /* incremented when batch uncharge started */
1460 struct mem_cgroup *memcg; /* target memcg of uncharge */
1461 unsigned long nr_pages; /* uncharged usage */
1462 unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
1464 unsigned int memcg_kmem_skip_account;
1466 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1467 atomic_t ptrace_bp_refcnt;
1469 #ifdef CONFIG_UPROBES
1470 struct uprobe_task *utask;
1474 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1475 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1477 #ifdef CONFIG_NUMA_BALANCING
1478 extern void task_numa_fault(int node, int pages, bool migrated);
1479 extern void set_numabalancing_state(bool enabled);
1481 static inline void task_numa_fault(int node, int pages, bool migrated)
1484 static inline void set_numabalancing_state(bool enabled)
1489 static inline struct pid *task_pid(struct task_struct *task)
1491 return task->pids[PIDTYPE_PID].pid;
1494 static inline struct pid *task_tgid(struct task_struct *task)
1496 return task->group_leader->pids[PIDTYPE_PID].pid;
1500 * Without tasklist or rcu lock it is not safe to dereference
1501 * the result of task_pgrp/task_session even if task == current,
1502 * we can race with another thread doing sys_setsid/sys_setpgid.
1504 static inline struct pid *task_pgrp(struct task_struct *task)
1506 return task->group_leader->pids[PIDTYPE_PGID].pid;
1509 static inline struct pid *task_session(struct task_struct *task)
1511 return task->group_leader->pids[PIDTYPE_SID].pid;
1514 struct pid_namespace;
1517 * the helpers to get the task's different pids as they are seen
1518 * from various namespaces
1520 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1521 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1523 * task_xid_nr_ns() : id seen from the ns specified;
1525 * set_task_vxid() : assigns a virtual id to a task;
1527 * see also pid_nr() etc in include/linux/pid.h
1529 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1530 struct pid_namespace *ns);
1532 static inline pid_t task_pid_nr(struct task_struct *tsk)
1537 static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1538 struct pid_namespace *ns)
1540 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1543 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1545 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1549 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1554 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1556 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1558 return pid_vnr(task_tgid(tsk));
1562 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1563 struct pid_namespace *ns)
1565 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1568 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1570 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1574 static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1575 struct pid_namespace *ns)
1577 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1580 static inline pid_t task_session_vnr(struct task_struct *tsk)
1582 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1585 /* obsolete, do not use */
1586 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1588 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1592 * pid_alive - check that a task structure is not stale
1593 * @p: Task structure to be checked.
1595 * Test if a process is not yet dead (at most zombie state)
1596 * If pid_alive fails, then pointers within the task structure
1597 * can be stale and must not be dereferenced.
1599 static inline int pid_alive(struct task_struct *p)
1601 return p->pids[PIDTYPE_PID].pid != NULL;
1605 * is_global_init - check if a task structure is init
1606 * @tsk: Task structure to be checked.
1608 * Check if a task structure is the first user space task the kernel created.
1610 static inline int is_global_init(struct task_struct *tsk)
1612 return tsk->pid == 1;
1615 extern struct pid *cad_pid;
1617 extern void free_task(struct task_struct *tsk);
1618 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1620 extern void __put_task_struct(struct task_struct *t);
1622 static inline void put_task_struct(struct task_struct *t)
1624 if (atomic_dec_and_test(&t->usage))
1625 __put_task_struct(t);
1628 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1629 extern void task_cputime(struct task_struct *t,
1630 cputime_t *utime, cputime_t *stime);
1631 extern void task_cputime_scaled(struct task_struct *t,
1632 cputime_t *utimescaled, cputime_t *stimescaled);
1633 extern cputime_t task_gtime(struct task_struct *t);
1635 static inline void task_cputime(struct task_struct *t,
1636 cputime_t *utime, cputime_t *stime)
1644 static inline void task_cputime_scaled(struct task_struct *t,
1645 cputime_t *utimescaled,
1646 cputime_t *stimescaled)
1649 *utimescaled = t->utimescaled;
1651 *stimescaled = t->stimescaled;
1654 static inline cputime_t task_gtime(struct task_struct *t)
1659 extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
1660 extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
1665 #define PF_EXITING 0x00000004 /* getting shut down */
1666 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1667 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1668 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1669 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1670 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1671 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1672 #define PF_DUMPCORE 0x00000200 /* dumped core */
1673 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1674 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1675 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1676 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1677 #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */
1678 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1679 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1680 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1681 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1682 #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */
1683 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1684 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1685 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1686 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1687 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1688 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1689 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1690 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1691 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1692 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1693 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1696 * Only the _current_ task can read/write to tsk->flags, but other
1697 * tasks can access tsk->flags in readonly mode for example
1698 * with tsk_used_math (like during threaded core dumping).
1699 * There is however an exception to this rule during ptrace
1700 * or during fork: the ptracer task is allowed to write to the
1701 * child->flags of its traced child (same goes for fork, the parent
1702 * can write to the child->flags), because we're guaranteed the
1703 * child is not running and in turn not changing child->flags
1704 * at the same time the parent does it.
1706 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1707 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1708 #define clear_used_math() clear_stopped_child_used_math(current)
1709 #define set_used_math() set_stopped_child_used_math(current)
1710 #define conditional_stopped_child_used_math(condition, child) \
1711 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1712 #define conditional_used_math(condition) \
1713 conditional_stopped_child_used_math(condition, current)
1714 #define copy_to_stopped_child_used_math(child) \
1715 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1716 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1717 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1718 #define used_math() tsk_used_math(current)
1720 /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags */
1721 static inline gfp_t memalloc_noio_flags(gfp_t flags)
1723 if (unlikely(current->flags & PF_MEMALLOC_NOIO))
1728 static inline unsigned int memalloc_noio_save(void)
1730 unsigned int flags = current->flags & PF_MEMALLOC_NOIO;
1731 current->flags |= PF_MEMALLOC_NOIO;
1735 static inline void memalloc_noio_restore(unsigned int flags)
1737 current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags;
1741 * task->jobctl flags
1743 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1745 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1746 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1747 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1748 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1749 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1750 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1751 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1753 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1754 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
1755 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
1756 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
1757 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
1758 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
1759 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
1761 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1762 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
1764 extern bool task_set_jobctl_pending(struct task_struct *task,
1766 extern void task_clear_jobctl_trapping(struct task_struct *task);
1767 extern void task_clear_jobctl_pending(struct task_struct *task,
1770 #ifdef CONFIG_PREEMPT_RCU
1772 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1773 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1775 static inline void rcu_copy_process(struct task_struct *p)
1777 p->rcu_read_lock_nesting = 0;
1778 p->rcu_read_unlock_special = 0;
1779 #ifdef CONFIG_TREE_PREEMPT_RCU
1780 p->rcu_blocked_node = NULL;
1781 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1782 #ifdef CONFIG_RCU_BOOST
1783 p->rcu_boost_mutex = NULL;
1784 #endif /* #ifdef CONFIG_RCU_BOOST */
1785 INIT_LIST_HEAD(&p->rcu_node_entry);
1790 static inline void rcu_copy_process(struct task_struct *p)
1796 static inline void tsk_restore_flags(struct task_struct *task,
1797 unsigned long orig_flags, unsigned long flags)
1799 task->flags &= ~flags;
1800 task->flags |= orig_flags & flags;
1804 extern void do_set_cpus_allowed(struct task_struct *p,
1805 const struct cpumask *new_mask);
1807 extern int set_cpus_allowed_ptr(struct task_struct *p,
1808 const struct cpumask *new_mask);
1810 static inline void do_set_cpus_allowed(struct task_struct *p,
1811 const struct cpumask *new_mask)
1814 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1815 const struct cpumask *new_mask)
1817 if (!cpumask_test_cpu(0, new_mask))
1824 void calc_load_enter_idle(void);
1825 void calc_load_exit_idle(void);
1827 static inline void calc_load_enter_idle(void) { }
1828 static inline void calc_load_exit_idle(void) { }
1829 #endif /* CONFIG_NO_HZ */
1831 #ifndef CONFIG_CPUMASK_OFFSTACK
1832 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1834 return set_cpus_allowed_ptr(p, &new_mask);
1839 * Do not use outside of architecture code which knows its limitations.
1841 * sched_clock() has no promise of monotonicity or bounded drift between
1842 * CPUs, use (which you should not) requires disabling IRQs.
1844 * Please use one of the three interfaces below.
1846 extern unsigned long long notrace sched_clock(void);
1848 * See the comment in kernel/sched/clock.c
1850 extern u64 cpu_clock(int cpu);
1851 extern u64 local_clock(void);
1852 extern u64 sched_clock_cpu(int cpu);
1855 extern void sched_clock_init(void);
1857 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1858 static inline void sched_clock_tick(void)
1862 static inline void sched_clock_idle_sleep_event(void)
1866 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1871 * Architectures can set this to 1 if they have specified
1872 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1873 * but then during bootup it turns out that sched_clock()
1874 * is reliable after all:
1876 extern int sched_clock_stable;
1878 extern void sched_clock_tick(void);
1879 extern void sched_clock_idle_sleep_event(void);
1880 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1883 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1885 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1886 * The reason for this explicit opt-in is not to have perf penalty with
1887 * slow sched_clocks.
1889 extern void enable_sched_clock_irqtime(void);
1890 extern void disable_sched_clock_irqtime(void);
1892 static inline void enable_sched_clock_irqtime(void) {}
1893 static inline void disable_sched_clock_irqtime(void) {}
1896 extern unsigned long long
1897 task_sched_runtime(struct task_struct *task);
1899 /* sched_exec is called by processes performing an exec */
1901 extern void sched_exec(void);
1903 #define sched_exec() {}
1906 extern void sched_clock_idle_sleep_event(void);
1907 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1909 #ifdef CONFIG_HOTPLUG_CPU
1910 extern void idle_task_exit(void);
1912 static inline void idle_task_exit(void) {}
1915 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1916 extern void wake_up_idle_cpu(int cpu);
1918 static inline void wake_up_idle_cpu(int cpu) { }
1921 #ifdef CONFIG_SCHED_AUTOGROUP
1922 extern void sched_autogroup_create_attach(struct task_struct *p);
1923 extern void sched_autogroup_detach(struct task_struct *p);
1924 extern void sched_autogroup_fork(struct signal_struct *sig);
1925 extern void sched_autogroup_exit(struct signal_struct *sig);
1926 #ifdef CONFIG_PROC_FS
1927 extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
1928 extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
1931 static inline void sched_autogroup_create_attach(struct task_struct *p) { }
1932 static inline void sched_autogroup_detach(struct task_struct *p) { }
1933 static inline void sched_autogroup_fork(struct signal_struct *sig) { }
1934 static inline void sched_autogroup_exit(struct signal_struct *sig) { }
1937 extern bool yield_to(struct task_struct *p, bool preempt);
1938 extern void set_user_nice(struct task_struct *p, long nice);
1939 extern int task_prio(const struct task_struct *p);
1940 extern int task_nice(const struct task_struct *p);
1941 extern int can_nice(const struct task_struct *p, const int nice);
1942 extern int task_curr(const struct task_struct *p);
1943 extern int idle_cpu(int cpu);
1944 extern int sched_setscheduler(struct task_struct *, int,
1945 const struct sched_param *);
1946 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1947 const struct sched_param *);
1948 extern struct task_struct *idle_task(int cpu);
1950 * is_idle_task - is the specified task an idle task?
1951 * @p: the task in question.
1953 static inline bool is_idle_task(const struct task_struct *p)
1957 extern struct task_struct *curr_task(int cpu);
1958 extern void set_curr_task(int cpu, struct task_struct *p);
1963 * The default (Linux) execution domain.
1965 extern struct exec_domain default_exec_domain;
1967 union thread_union {
1968 struct thread_info thread_info;
1969 unsigned long stack[THREAD_SIZE/sizeof(long)];
1972 #ifndef __HAVE_ARCH_KSTACK_END
1973 static inline int kstack_end(void *addr)
1975 /* Reliable end of stack detection:
1976 * Some APM bios versions misalign the stack
1978 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1982 extern union thread_union init_thread_union;
1983 extern struct task_struct init_task;
1985 extern struct mm_struct init_mm;
1987 extern struct pid_namespace init_pid_ns;
1990 * find a task by one of its numerical ids
1992 * find_task_by_pid_ns():
1993 * finds a task by its pid in the specified namespace
1994 * find_task_by_vpid():
1995 * finds a task by its virtual pid
1997 * see also find_vpid() etc in include/linux/pid.h
2000 extern struct task_struct *find_task_by_vpid(pid_t nr);
2001 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2002 struct pid_namespace *ns);
2004 extern void __set_special_pids(struct pid *pid);
2006 /* per-UID process charging. */
2007 extern struct user_struct * alloc_uid(kuid_t);
2008 static inline struct user_struct *get_uid(struct user_struct *u)
2010 atomic_inc(&u->__count);
2013 extern void free_uid(struct user_struct *);
2015 #include <asm/current.h>
2017 extern void xtime_update(unsigned long ticks);
2019 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2020 extern int wake_up_process(struct task_struct *tsk);
2021 extern void wake_up_new_task(struct task_struct *tsk);
2023 extern void kick_process(struct task_struct *tsk);
2025 static inline void kick_process(struct task_struct *tsk) { }
2027 extern void sched_fork(struct task_struct *p);
2028 extern void sched_dead(struct task_struct *p);
2030 extern void proc_caches_init(void);
2031 extern void flush_signals(struct task_struct *);
2032 extern void __flush_signals(struct task_struct *);
2033 extern void ignore_signals(struct task_struct *);
2034 extern void flush_signal_handlers(struct task_struct *, int force_default);
2035 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2037 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2039 unsigned long flags;
2042 spin_lock_irqsave(&tsk->sighand->siglock, flags);
2043 ret = dequeue_signal(tsk, mask, info);
2044 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2049 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2051 extern void unblock_all_signals(void);
2052 extern void release_task(struct task_struct * p);
2053 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2054 extern int force_sigsegv(int, struct task_struct *);
2055 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2056 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2057 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2058 extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
2059 const struct cred *, u32);
2060 extern int kill_pgrp(struct pid *pid, int sig, int priv);
2061 extern int kill_pid(struct pid *pid, int sig, int priv);
2062 extern int kill_proc_info(int, struct siginfo *, pid_t);
2063 extern __must_check bool do_notify_parent(struct task_struct *, int);
2064 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2065 extern void force_sig(int, struct task_struct *);
2066 extern int send_sig(int, struct task_struct *, int);
2067 extern int zap_other_threads(struct task_struct *p);
2068 extern struct sigqueue *sigqueue_alloc(void);
2069 extern void sigqueue_free(struct sigqueue *);
2070 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
2071 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2073 static inline void restore_saved_sigmask(void)
2075 if (test_and_clear_restore_sigmask())
2076 __set_current_blocked(¤t->saved_sigmask);
2079 static inline sigset_t *sigmask_to_save(void)
2081 sigset_t *res = ¤t->blocked;
2082 if (unlikely(test_restore_sigmask()))
2083 res = ¤t->saved_sigmask;
2087 static inline int kill_cad_pid(int sig, int priv)
2089 return kill_pid(cad_pid, sig, priv);
2092 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2093 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2094 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2095 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2098 * True if we are on the alternate signal stack.
2100 static inline int on_sig_stack(unsigned long sp)
2102 #ifdef CONFIG_STACK_GROWSUP
2103 return sp >= current->sas_ss_sp &&
2104 sp - current->sas_ss_sp < current->sas_ss_size;
2106 return sp > current->sas_ss_sp &&
2107 sp - current->sas_ss_sp <= current->sas_ss_size;
2111 static inline int sas_ss_flags(unsigned long sp)
2113 return (current->sas_ss_size == 0 ? SS_DISABLE
2114 : on_sig_stack(sp) ? SS_ONSTACK : 0);
2117 static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
2119 if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
2120 #ifdef CONFIG_STACK_GROWSUP
2121 return current->sas_ss_sp;
2123 return current->sas_ss_sp + current->sas_ss_size;
2129 * Routines for handling mm_structs
2131 extern struct mm_struct * mm_alloc(void);
2133 /* mmdrop drops the mm and the page tables */
2134 extern void __mmdrop(struct mm_struct *);
2135 static inline void mmdrop(struct mm_struct * mm)
2137 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2141 /* mmput gets rid of the mappings and all user-space */
2142 extern void mmput(struct mm_struct *);
2143 /* Grab a reference to a task's mm, if it is not already going away */
2144 extern struct mm_struct *get_task_mm(struct task_struct *task);
2146 * Grab a reference to a task's mm, if it is not already going away
2147 * and ptrace_may_access with the mode parameter passed to it
2150 extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
2151 /* Remove the current tasks stale references to the old mm_struct */
2152 extern void mm_release(struct task_struct *, struct mm_struct *);
2153 /* Allocate a new mm structure and copy contents from tsk->mm */
2154 extern struct mm_struct *dup_mm(struct task_struct *tsk);
2156 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2157 struct task_struct *);
2158 extern void flush_thread(void);
2159 extern void exit_thread(void);
2161 extern void exit_files(struct task_struct *);
2162 extern void __cleanup_sighand(struct sighand_struct *);
2164 extern void exit_itimers(struct signal_struct *);
2165 extern void flush_itimer_signals(void);
2167 extern void do_group_exit(int);
2169 extern int allow_signal(int);
2170 extern int disallow_signal(int);
2172 extern int do_execve(const char *,
2173 const char __user * const __user *,
2174 const char __user * const __user *);
2175 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
2176 struct task_struct *fork_idle(int);
2177 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
2179 extern void set_task_comm(struct task_struct *tsk, char *from);
2180 extern char *get_task_comm(char *to, struct task_struct *tsk);
2183 void scheduler_ipi(void);
2184 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2186 static inline void scheduler_ipi(void) { }
2187 static inline unsigned long wait_task_inactive(struct task_struct *p,
2194 #define next_task(p) \
2195 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2197 #define for_each_process(p) \
2198 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2200 extern bool current_is_single_threaded(void);
2203 * Careful: do_each_thread/while_each_thread is a double loop so
2204 * 'break' will not work as expected - use goto instead.
2206 #define do_each_thread(g, t) \
2207 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2209 #define while_each_thread(g, t) \
2210 while ((t = next_thread(t)) != g)
2212 static inline int get_nr_threads(struct task_struct *tsk)
2214 return tsk->signal->nr_threads;
2217 static inline bool thread_group_leader(struct task_struct *p)
2219 return p->exit_signal >= 0;
2222 /* Do to the insanities of de_thread it is possible for a process
2223 * to have the pid of the thread group leader without actually being
2224 * the thread group leader. For iteration through the pids in proc
2225 * all we care about is that we have a task with the appropriate
2226 * pid, we don't actually care if we have the right task.
2228 static inline int has_group_leader_pid(struct task_struct *p)
2230 return p->pid == p->tgid;
2234 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2236 return p1->tgid == p2->tgid;
2239 static inline struct task_struct *next_thread(const struct task_struct *p)
2241 return list_entry_rcu(p->thread_group.next,
2242 struct task_struct, thread_group);
2245 static inline int thread_group_empty(struct task_struct *p)
2247 return list_empty(&p->thread_group);
2250 #define delay_group_leader(p) \
2251 (thread_group_leader(p) && !thread_group_empty(p))
2254 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2255 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2256 * pins the final release of task.io_context. Also protects ->cpuset and
2257 * ->cgroup.subsys[]. And ->vfork_done.
2259 * Nests both inside and outside of read_lock(&tasklist_lock).
2260 * It must not be nested with write_lock_irq(&tasklist_lock),
2261 * neither inside nor outside.
2263 static inline void task_lock(struct task_struct *p)
2265 spin_lock(&p->alloc_lock);
2268 static inline void task_unlock(struct task_struct *p)
2270 spin_unlock(&p->alloc_lock);
2273 extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2274 unsigned long *flags);
2276 static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2277 unsigned long *flags)
2279 struct sighand_struct *ret;
2281 ret = __lock_task_sighand(tsk, flags);
2282 (void)__cond_lock(&tsk->sighand->siglock, ret);
2286 static inline void unlock_task_sighand(struct task_struct *tsk,
2287 unsigned long *flags)
2289 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2292 #ifdef CONFIG_CGROUPS
2293 static inline void threadgroup_change_begin(struct task_struct *tsk)
2295 down_read(&tsk->signal->group_rwsem);
2297 static inline void threadgroup_change_end(struct task_struct *tsk)
2299 up_read(&tsk->signal->group_rwsem);
2303 * threadgroup_lock - lock threadgroup
2304 * @tsk: member task of the threadgroup to lock
2306 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2307 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2308 * perform exec. This is useful for cases where the threadgroup needs to
2309 * stay stable across blockable operations.
2311 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2312 * synchronization. While held, no new task will be added to threadgroup
2313 * and no existing live task will have its PF_EXITING set.
2315 * During exec, a task goes and puts its thread group through unusual
2316 * changes. After de-threading, exclusive access is assumed to resources
2317 * which are usually shared by tasks in the same group - e.g. sighand may
2318 * be replaced with a new one. Also, the exec'ing task takes over group
2319 * leader role including its pid. Exclude these changes while locked by
2320 * grabbing cred_guard_mutex which is used to synchronize exec path.
2322 static inline void threadgroup_lock(struct task_struct *tsk)
2325 * exec uses exit for de-threading nesting group_rwsem inside
2326 * cred_guard_mutex. Grab cred_guard_mutex first.
2328 mutex_lock(&tsk->signal->cred_guard_mutex);
2329 down_write(&tsk->signal->group_rwsem);
2333 * threadgroup_unlock - unlock threadgroup
2334 * @tsk: member task of the threadgroup to unlock
2336 * Reverse threadgroup_lock().
2338 static inline void threadgroup_unlock(struct task_struct *tsk)
2340 up_write(&tsk->signal->group_rwsem);
2341 mutex_unlock(&tsk->signal->cred_guard_mutex);
2344 static inline void threadgroup_change_begin(struct task_struct *tsk) {}
2345 static inline void threadgroup_change_end(struct task_struct *tsk) {}
2346 static inline void threadgroup_lock(struct task_struct *tsk) {}
2347 static inline void threadgroup_unlock(struct task_struct *tsk) {}
2350 #ifndef __HAVE_THREAD_FUNCTIONS
2352 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2353 #define task_stack_page(task) ((task)->stack)
2355 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2357 *task_thread_info(p) = *task_thread_info(org);
2358 task_thread_info(p)->task = p;
2361 static inline unsigned long *end_of_stack(struct task_struct *p)
2363 return (unsigned long *)(task_thread_info(p) + 1);
2368 static inline int object_is_on_stack(void *obj)
2370 void *stack = task_stack_page(current);
2372 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2375 extern void thread_info_cache_init(void);
2377 #ifdef CONFIG_DEBUG_STACK_USAGE
2378 static inline unsigned long stack_not_used(struct task_struct *p)
2380 unsigned long *n = end_of_stack(p);
2382 do { /* Skip over canary */
2386 return (unsigned long)n - (unsigned long)end_of_stack(p);
2390 /* set thread flags in other task's structures
2391 * - see asm/thread_info.h for TIF_xxxx flags available
2393 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2395 set_ti_thread_flag(task_thread_info(tsk), flag);
2398 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2400 clear_ti_thread_flag(task_thread_info(tsk), flag);
2403 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2405 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2408 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2410 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2413 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2415 return test_ti_thread_flag(task_thread_info(tsk), flag);
2418 static inline void set_tsk_need_resched(struct task_struct *tsk)
2420 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2423 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2425 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2428 static inline int test_tsk_need_resched(struct task_struct *tsk)
2430 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2433 static inline int restart_syscall(void)
2435 set_tsk_thread_flag(current, TIF_SIGPENDING);
2436 return -ERESTARTNOINTR;
2439 static inline int signal_pending(struct task_struct *p)
2441 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2444 static inline int __fatal_signal_pending(struct task_struct *p)
2446 return unlikely(sigismember(&p->pending.signal, SIGKILL));
2449 static inline int fatal_signal_pending(struct task_struct *p)
2451 return signal_pending(p) && __fatal_signal_pending(p);
2454 static inline int signal_pending_state(long state, struct task_struct *p)
2456 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2458 if (!signal_pending(p))
2461 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2464 static inline int need_resched(void)
2466 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2470 * cond_resched() and cond_resched_lock(): latency reduction via
2471 * explicit rescheduling in places that are safe. The return
2472 * value indicates whether a reschedule was done in fact.
2473 * cond_resched_lock() will drop the spinlock before scheduling,
2474 * cond_resched_softirq() will enable bhs before scheduling.
2476 extern int _cond_resched(void);
2478 #define cond_resched() ({ \
2479 __might_sleep(__FILE__, __LINE__, 0); \
2483 extern int __cond_resched_lock(spinlock_t *lock);
2485 #ifdef CONFIG_PREEMPT_COUNT
2486 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2488 #define PREEMPT_LOCK_OFFSET 0
2491 #define cond_resched_lock(lock) ({ \
2492 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2493 __cond_resched_lock(lock); \
2496 extern int __cond_resched_softirq(void);
2498 #define cond_resched_softirq() ({ \
2499 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2500 __cond_resched_softirq(); \
2504 * Does a critical section need to be broken due to another
2505 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2506 * but a general need for low latency)
2508 static inline int spin_needbreak(spinlock_t *lock)
2510 #ifdef CONFIG_PREEMPT
2511 return spin_is_contended(lock);
2518 * Thread group CPU time accounting.
2520 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2521 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2523 static inline void thread_group_cputime_init(struct signal_struct *sig)
2525 raw_spin_lock_init(&sig->cputimer.lock);
2529 * Reevaluate whether the task has signals pending delivery.
2530 * Wake the task if so.
2531 * This is required every time the blocked sigset_t changes.
2532 * callers must hold sighand->siglock.
2534 extern void recalc_sigpending_and_wake(struct task_struct *t);
2535 extern void recalc_sigpending(void);
2537 extern void signal_wake_up_state(struct task_struct *t, unsigned int state);
2539 static inline void signal_wake_up(struct task_struct *t, bool resume)
2541 signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0);
2543 static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume)
2545 signal_wake_up_state(t, resume ? __TASK_TRACED : 0);
2549 * Wrappers for p->thread_info->cpu access. No-op on UP.
2553 static inline unsigned int task_cpu(const struct task_struct *p)
2555 return task_thread_info(p)->cpu;
2558 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2562 static inline unsigned int task_cpu(const struct task_struct *p)
2567 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2571 #endif /* CONFIG_SMP */
2573 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2574 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2576 #ifdef CONFIG_CGROUP_SCHED
2578 extern struct task_group root_task_group;
2580 extern struct task_group *sched_create_group(struct task_group *parent);
2581 extern void sched_online_group(struct task_group *tg,
2582 struct task_group *parent);
2583 extern void sched_destroy_group(struct task_group *tg);
2584 extern void sched_offline_group(struct task_group *tg);
2585 extern void sched_move_task(struct task_struct *tsk);
2586 #ifdef CONFIG_FAIR_GROUP_SCHED
2587 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2588 extern unsigned long sched_group_shares(struct task_group *tg);
2590 #ifdef CONFIG_RT_GROUP_SCHED
2591 extern int sched_group_set_rt_runtime(struct task_group *tg,
2592 long rt_runtime_us);
2593 extern long sched_group_rt_runtime(struct task_group *tg);
2594 extern int sched_group_set_rt_period(struct task_group *tg,
2596 extern long sched_group_rt_period(struct task_group *tg);
2597 extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2599 #endif /* CONFIG_CGROUP_SCHED */
2601 extern int task_can_switch_user(struct user_struct *up,
2602 struct task_struct *tsk);
2604 #ifdef CONFIG_TASK_XACCT
2605 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2607 tsk->ioac.rchar += amt;
2610 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2612 tsk->ioac.wchar += amt;
2615 static inline void inc_syscr(struct task_struct *tsk)
2620 static inline void inc_syscw(struct task_struct *tsk)
2625 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2629 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2633 static inline void inc_syscr(struct task_struct *tsk)
2637 static inline void inc_syscw(struct task_struct *tsk)
2642 #ifndef TASK_SIZE_OF
2643 #define TASK_SIZE_OF(tsk) TASK_SIZE
2646 #ifdef CONFIG_MM_OWNER
2647 extern void mm_update_next_owner(struct mm_struct *mm);
2648 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2650 static inline void mm_update_next_owner(struct mm_struct *mm)
2654 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2657 #endif /* CONFIG_MM_OWNER */
2659 static inline unsigned long task_rlimit(const struct task_struct *tsk,
2662 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2665 static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2668 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2671 static inline unsigned long rlimit(unsigned int limit)
2673 return task_rlimit(current, limit);
2676 static inline unsigned long rlimit_max(unsigned int limit)
2678 return task_rlimit_max(current, limit);