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>
25 #include <linux/preempt_mask.h>
28 #include <asm/ptrace.h>
29 #include <asm/cputime.h>
31 #include <linux/smp.h>
32 #include <linux/sem.h>
33 #include <linux/signal.h>
34 #include <linux/compiler.h>
35 #include <linux/completion.h>
36 #include <linux/pid.h>
37 #include <linux/percpu.h>
38 #include <linux/topology.h>
39 #include <linux/proportions.h>
40 #include <linux/seccomp.h>
41 #include <linux/rcupdate.h>
42 #include <linux/rculist.h>
43 #include <linux/rtmutex.h>
45 #include <linux/time.h>
46 #include <linux/param.h>
47 #include <linux/resource.h>
48 #include <linux/timer.h>
49 #include <linux/hrtimer.h>
50 #include <linux/task_io_accounting.h>
51 #include <linux/latencytop.h>
52 #include <linux/cred.h>
53 #include <linux/llist.h>
54 #include <linux/uidgid.h>
55 #include <linux/gfp.h>
57 #include <asm/processor.h>
59 #define SCHED_ATTR_SIZE_VER0 48 /* sizeof first published struct */
62 * Extended scheduling parameters data structure.
64 * This is needed because the original struct sched_param can not be
65 * altered without introducing ABI issues with legacy applications
66 * (e.g., in sched_getparam()).
68 * However, the possibility of specifying more than just a priority for
69 * the tasks may be useful for a wide variety of application fields, e.g.,
70 * multimedia, streaming, automation and control, and many others.
72 * This variant (sched_attr) is meant at describing a so-called
73 * sporadic time-constrained task. In such model a task is specified by:
74 * - the activation period or minimum instance inter-arrival time;
75 * - the maximum (or average, depending on the actual scheduling
76 * discipline) computation time of all instances, a.k.a. runtime;
77 * - the deadline (relative to the actual activation time) of each
79 * Very briefly, a periodic (sporadic) task asks for the execution of
80 * some specific computation --which is typically called an instance--
81 * (at most) every period. Moreover, each instance typically lasts no more
82 * than the runtime and must be completed by time instant t equal to
83 * the instance activation time + the deadline.
85 * This is reflected by the actual fields of the sched_attr structure:
87 * @size size of the structure, for fwd/bwd compat.
89 * @sched_policy task's scheduling policy
90 * @sched_flags for customizing the scheduler behaviour
91 * @sched_nice task's nice value (SCHED_NORMAL/BATCH)
92 * @sched_priority task's static priority (SCHED_FIFO/RR)
93 * @sched_deadline representative of the task's deadline
94 * @sched_runtime representative of the task's runtime
95 * @sched_period representative of the task's period
97 * Given this task model, there are a multiplicity of scheduling algorithms
98 * and policies, that can be used to ensure all the tasks will make their
101 * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the
102 * only user of this new interface. More information about the algorithm
103 * available in the scheduling class file or in Documentation/.
111 /* SCHED_NORMAL, SCHED_BATCH */
114 /* SCHED_FIFO, SCHED_RR */
124 struct futex_pi_state
;
125 struct robust_list_head
;
128 struct perf_event_context
;
132 * List of flags we want to share for kernel threads,
133 * if only because they are not used by them anyway.
135 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
138 * These are the constant used to fake the fixed-point load-average
139 * counting. Some notes:
140 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
141 * a load-average precision of 10 bits integer + 11 bits fractional
142 * - if you want to count load-averages more often, you need more
143 * precision, or rounding will get you. With 2-second counting freq,
144 * the EXP_n values would be 1981, 2034 and 2043 if still using only
147 extern unsigned long avenrun
[]; /* Load averages */
148 extern void get_avenrun(unsigned long *loads
, unsigned long offset
, int shift
);
150 #define FSHIFT 11 /* nr of bits of precision */
151 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
152 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
153 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
154 #define EXP_5 2014 /* 1/exp(5sec/5min) */
155 #define EXP_15 2037 /* 1/exp(5sec/15min) */
157 #define CALC_LOAD(load,exp,n) \
159 load += n*(FIXED_1-exp); \
162 extern unsigned long total_forks
;
163 extern int nr_threads
;
164 DECLARE_PER_CPU(unsigned long, process_counts
);
165 extern int nr_processes(void);
166 extern unsigned long nr_running(void);
167 extern unsigned long nr_iowait(void);
168 extern unsigned long nr_iowait_cpu(int cpu
);
169 extern unsigned long this_cpu_load(void);
172 extern void calc_global_load(unsigned long ticks
);
173 extern void update_cpu_load_nohz(void);
175 extern unsigned long get_parent_ip(unsigned long addr
);
177 extern void dump_cpu_task(int cpu
);
182 #ifdef CONFIG_SCHED_DEBUG
183 extern void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
);
184 extern void proc_sched_set_task(struct task_struct
*p
);
186 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
);
190 * Task state bitmask. NOTE! These bits are also
191 * encoded in fs/proc/array.c: get_task_state().
193 * We have two separate sets of flags: task->state
194 * is about runnability, while task->exit_state are
195 * about the task exiting. Confusing, but this way
196 * modifying one set can't modify the other one by
199 #define TASK_RUNNING 0
200 #define TASK_INTERRUPTIBLE 1
201 #define TASK_UNINTERRUPTIBLE 2
202 #define __TASK_STOPPED 4
203 #define __TASK_TRACED 8
204 /* in tsk->exit_state */
205 #define EXIT_ZOMBIE 16
207 /* in tsk->state again */
209 #define TASK_WAKEKILL 128
210 #define TASK_WAKING 256
211 #define TASK_PARKED 512
212 #define TASK_STATE_MAX 1024
214 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
216 extern char ___assert_task_state
[1 - 2*!!(
217 sizeof(TASK_STATE_TO_CHAR_STR
)-1 != ilog2(TASK_STATE_MAX
)+1)];
219 /* Convenience macros for the sake of set_task_state */
220 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
221 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
222 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
224 /* Convenience macros for the sake of wake_up */
225 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
226 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
228 /* get_task_state() */
229 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
230 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
233 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
234 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
235 #define task_is_stopped_or_traced(task) \
236 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
237 #define task_contributes_to_load(task) \
238 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
239 (task->flags & PF_FROZEN) == 0)
241 #define __set_task_state(tsk, state_value) \
242 do { (tsk)->state = (state_value); } while (0)
243 #define set_task_state(tsk, state_value) \
244 set_mb((tsk)->state, (state_value))
247 * set_current_state() includes a barrier so that the write of current->state
248 * is correctly serialised wrt the caller's subsequent test of whether to
251 * set_current_state(TASK_UNINTERRUPTIBLE);
252 * if (do_i_need_to_sleep())
255 * If the caller does not need such serialisation then use __set_current_state()
257 #define __set_current_state(state_value) \
258 do { current->state = (state_value); } while (0)
259 #define set_current_state(state_value) \
260 set_mb(current->state, (state_value))
262 /* Task command name length */
263 #define TASK_COMM_LEN 16
265 #include <linux/spinlock.h>
268 * This serializes "schedule()" and also protects
269 * the run-queue from deletions/modifications (but
270 * _adding_ to the beginning of the run-queue has
273 extern rwlock_t tasklist_lock
;
274 extern spinlock_t mmlist_lock
;
278 #ifdef CONFIG_PROVE_RCU
279 extern int lockdep_tasklist_lock_is_held(void);
280 #endif /* #ifdef CONFIG_PROVE_RCU */
282 extern void sched_init(void);
283 extern void sched_init_smp(void);
284 extern asmlinkage
void schedule_tail(struct task_struct
*prev
);
285 extern void init_idle(struct task_struct
*idle
, int cpu
);
286 extern void init_idle_bootup_task(struct task_struct
*idle
);
288 extern int runqueue_is_locked(int cpu
);
290 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
291 extern void nohz_balance_enter_idle(int cpu
);
292 extern void set_cpu_sd_state_idle(void);
293 extern int get_nohz_timer_target(void);
295 static inline void nohz_balance_enter_idle(int cpu
) { }
296 static inline void set_cpu_sd_state_idle(void) { }
300 * Only dump TASK_* tasks. (0 for all tasks)
302 extern void show_state_filter(unsigned long state_filter
);
304 static inline void show_state(void)
306 show_state_filter(0);
309 extern void show_regs(struct pt_regs
*);
312 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
313 * task), SP is the stack pointer of the first frame that should be shown in the back
314 * trace (or NULL if the entire call-chain of the task should be shown).
316 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
318 void io_schedule(void);
319 long io_schedule_timeout(long timeout
);
321 extern void cpu_init (void);
322 extern void trap_init(void);
323 extern void update_process_times(int user
);
324 extern void scheduler_tick(void);
326 extern void sched_show_task(struct task_struct
*p
);
328 #ifdef CONFIG_LOCKUP_DETECTOR
329 extern void touch_softlockup_watchdog(void);
330 extern void touch_softlockup_watchdog_sync(void);
331 extern void touch_all_softlockup_watchdogs(void);
332 extern int proc_dowatchdog_thresh(struct ctl_table
*table
, int write
,
334 size_t *lenp
, loff_t
*ppos
);
335 extern unsigned int softlockup_panic
;
336 void lockup_detector_init(void);
338 static inline void touch_softlockup_watchdog(void)
341 static inline void touch_softlockup_watchdog_sync(void)
344 static inline void touch_all_softlockup_watchdogs(void)
347 static inline void lockup_detector_init(void)
352 #ifdef CONFIG_DETECT_HUNG_TASK
353 void reset_hung_task_detector(void);
355 static inline void reset_hung_task_detector(void)
360 /* Attach to any functions which should be ignored in wchan output. */
361 #define __sched __attribute__((__section__(".sched.text")))
363 /* Linker adds these: start and end of __sched functions */
364 extern char __sched_text_start
[], __sched_text_end
[];
366 /* Is this address in the __sched functions? */
367 extern int in_sched_functions(unsigned long addr
);
369 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
370 extern signed long schedule_timeout(signed long timeout
);
371 extern signed long schedule_timeout_interruptible(signed long timeout
);
372 extern signed long schedule_timeout_killable(signed long timeout
);
373 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
374 asmlinkage
void schedule(void);
375 extern void schedule_preempt_disabled(void);
378 struct user_namespace
;
381 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
383 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
384 unsigned long, unsigned long);
386 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
387 unsigned long len
, unsigned long pgoff
,
388 unsigned long flags
);
390 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
) {}
394 extern void set_dumpable(struct mm_struct
*mm
, int value
);
395 extern int get_dumpable(struct mm_struct
*mm
);
397 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */
398 #define SUID_DUMP_USER 1 /* Dump as user of process */
399 #define SUID_DUMP_ROOT 2 /* Dump as root */
403 #define MMF_DUMPABLE 0 /* core dump is permitted */
404 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
406 #define MMF_DUMPABLE_BITS 2
407 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
409 /* coredump filter bits */
410 #define MMF_DUMP_ANON_PRIVATE 2
411 #define MMF_DUMP_ANON_SHARED 3
412 #define MMF_DUMP_MAPPED_PRIVATE 4
413 #define MMF_DUMP_MAPPED_SHARED 5
414 #define MMF_DUMP_ELF_HEADERS 6
415 #define MMF_DUMP_HUGETLB_PRIVATE 7
416 #define MMF_DUMP_HUGETLB_SHARED 8
418 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
419 #define MMF_DUMP_FILTER_BITS 7
420 #define MMF_DUMP_FILTER_MASK \
421 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
422 #define MMF_DUMP_FILTER_DEFAULT \
423 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
424 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
426 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
427 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
429 # define MMF_DUMP_MASK_DEFAULT_ELF 0
431 /* leave room for more dump flags */
432 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
433 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
434 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
436 #define MMF_HAS_UPROBES 19 /* has uprobes */
437 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
439 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
441 struct sighand_struct
{
443 struct k_sigaction action
[_NSIG
];
445 wait_queue_head_t signalfd_wqh
;
448 struct pacct_struct
{
451 unsigned long ac_mem
;
452 cputime_t ac_utime
, ac_stime
;
453 unsigned long ac_minflt
, ac_majflt
;
464 * struct cputime - snaphsot of system and user cputime
465 * @utime: time spent in user mode
466 * @stime: time spent in system mode
468 * Gathers a generic snapshot of user and system time.
476 * struct task_cputime - collected CPU time counts
477 * @utime: time spent in user mode, in &cputime_t units
478 * @stime: time spent in kernel mode, in &cputime_t units
479 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
481 * This is an extension of struct cputime that includes the total runtime
482 * spent by the task from the scheduler point of view.
484 * As a result, this structure groups together three kinds of CPU time
485 * that are tracked for threads and thread groups. Most things considering
486 * CPU time want to group these counts together and treat all three
487 * of them in parallel.
489 struct task_cputime
{
492 unsigned long long sum_exec_runtime
;
494 /* Alternate field names when used to cache expirations. */
495 #define prof_exp stime
496 #define virt_exp utime
497 #define sched_exp sum_exec_runtime
499 #define INIT_CPUTIME \
500 (struct task_cputime) { \
503 .sum_exec_runtime = 0, \
506 #ifdef CONFIG_PREEMPT_COUNT
507 #define PREEMPT_DISABLED (1 + PREEMPT_ENABLED)
509 #define PREEMPT_DISABLED PREEMPT_ENABLED
513 * Disable preemption until the scheduler is running.
514 * Reset by start_kernel()->sched_init()->init_idle().
516 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
517 * before the scheduler is active -- see should_resched().
519 #define INIT_PREEMPT_COUNT (PREEMPT_DISABLED + PREEMPT_ACTIVE)
522 * struct thread_group_cputimer - thread group interval timer counts
523 * @cputime: thread group interval timers.
524 * @running: non-zero when there are timers running and
525 * @cputime receives updates.
526 * @lock: lock for fields in this struct.
528 * This structure contains the version of task_cputime, above, that is
529 * used for thread group CPU timer calculations.
531 struct thread_group_cputimer
{
532 struct task_cputime cputime
;
537 #include <linux/rwsem.h>
541 * NOTE! "signal_struct" does not have its own
542 * locking, because a shared signal_struct always
543 * implies a shared sighand_struct, so locking
544 * sighand_struct is always a proper superset of
545 * the locking of signal_struct.
547 struct signal_struct
{
552 wait_queue_head_t wait_chldexit
; /* for wait4() */
554 /* current thread group signal load-balancing target: */
555 struct task_struct
*curr_target
;
557 /* shared signal handling: */
558 struct sigpending shared_pending
;
560 /* thread group exit support */
563 * - notify group_exit_task when ->count is equal to notify_count
564 * - everyone except group_exit_task is stopped during signal delivery
565 * of fatal signals, group_exit_task processes the signal.
568 struct task_struct
*group_exit_task
;
570 /* thread group stop support, overloads group_exit_code too */
571 int group_stop_count
;
572 unsigned int flags
; /* see SIGNAL_* flags below */
575 * PR_SET_CHILD_SUBREAPER marks a process, like a service
576 * manager, to re-parent orphan (double-forking) child processes
577 * to this process instead of 'init'. The service manager is
578 * able to receive SIGCHLD signals and is able to investigate
579 * the process until it calls wait(). All children of this
580 * process will inherit a flag if they should look for a
581 * child_subreaper process at exit.
583 unsigned int is_child_subreaper
:1;
584 unsigned int has_child_subreaper
:1;
586 /* POSIX.1b Interval Timers */
588 struct list_head posix_timers
;
590 /* ITIMER_REAL timer for the process */
591 struct hrtimer real_timer
;
592 struct pid
*leader_pid
;
593 ktime_t it_real_incr
;
596 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
597 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
598 * values are defined to 0 and 1 respectively
600 struct cpu_itimer it
[2];
603 * Thread group totals for process CPU timers.
604 * See thread_group_cputimer(), et al, for details.
606 struct thread_group_cputimer cputimer
;
608 /* Earliest-expiration cache. */
609 struct task_cputime cputime_expires
;
611 struct list_head cpu_timers
[3];
613 struct pid
*tty_old_pgrp
;
615 /* boolean value for session group leader */
618 struct tty_struct
*tty
; /* NULL if no tty */
620 #ifdef CONFIG_SCHED_AUTOGROUP
621 struct autogroup
*autogroup
;
624 * Cumulative resource counters for dead threads in the group,
625 * and for reaped dead child processes forked by this group.
626 * Live threads maintain their own counters and add to these
627 * in __exit_signal, except for the group leader.
629 cputime_t utime
, stime
, cutime
, cstime
;
632 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
633 struct cputime prev_cputime
;
635 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
636 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
637 unsigned long inblock
, oublock
, cinblock
, coublock
;
638 unsigned long maxrss
, cmaxrss
;
639 struct task_io_accounting ioac
;
642 * Cumulative ns of schedule CPU time fo dead threads in the
643 * group, not including a zombie group leader, (This only differs
644 * from jiffies_to_ns(utime + stime) if sched_clock uses something
645 * other than jiffies.)
647 unsigned long long sum_sched_runtime
;
650 * We don't bother to synchronize most readers of this at all,
651 * because there is no reader checking a limit that actually needs
652 * to get both rlim_cur and rlim_max atomically, and either one
653 * alone is a single word that can safely be read normally.
654 * getrlimit/setrlimit use task_lock(current->group_leader) to
655 * protect this instead of the siglock, because they really
656 * have no need to disable irqs.
658 struct rlimit rlim
[RLIM_NLIMITS
];
660 #ifdef CONFIG_BSD_PROCESS_ACCT
661 struct pacct_struct pacct
; /* per-process accounting information */
663 #ifdef CONFIG_TASKSTATS
664 struct taskstats
*stats
;
668 unsigned audit_tty_log_passwd
;
669 struct tty_audit_buf
*tty_audit_buf
;
671 #ifdef CONFIG_CGROUPS
673 * group_rwsem prevents new tasks from entering the threadgroup and
674 * member tasks from exiting,a more specifically, setting of
675 * PF_EXITING. fork and exit paths are protected with this rwsem
676 * using threadgroup_change_begin/end(). Users which require
677 * threadgroup to remain stable should use threadgroup_[un]lock()
678 * which also takes care of exec path. Currently, cgroup is the
681 struct rw_semaphore group_rwsem
;
684 oom_flags_t oom_flags
;
685 short oom_score_adj
; /* OOM kill score adjustment */
686 short oom_score_adj_min
; /* OOM kill score adjustment min value.
687 * Only settable by CAP_SYS_RESOURCE. */
689 struct mutex cred_guard_mutex
; /* guard against foreign influences on
690 * credential calculations
691 * (notably. ptrace) */
695 * Bits in flags field of signal_struct.
697 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
698 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
699 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
700 #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */
702 * Pending notifications to parent.
704 #define SIGNAL_CLD_STOPPED 0x00000010
705 #define SIGNAL_CLD_CONTINUED 0x00000020
706 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
708 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
710 /* If true, all threads except ->group_exit_task have pending SIGKILL */
711 static inline int signal_group_exit(const struct signal_struct
*sig
)
713 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
714 (sig
->group_exit_task
!= NULL
);
718 * Some day this will be a full-fledged user tracking system..
721 atomic_t __count
; /* reference count */
722 atomic_t processes
; /* How many processes does this user have? */
723 atomic_t files
; /* How many open files does this user have? */
724 atomic_t sigpending
; /* How many pending signals does this user have? */
725 #ifdef CONFIG_INOTIFY_USER
726 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
727 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
729 #ifdef CONFIG_FANOTIFY
730 atomic_t fanotify_listeners
;
733 atomic_long_t epoll_watches
; /* The number of file descriptors currently watched */
735 #ifdef CONFIG_POSIX_MQUEUE
736 /* protected by mq_lock */
737 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
739 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
742 struct key
*uid_keyring
; /* UID specific keyring */
743 struct key
*session_keyring
; /* UID's default session keyring */
746 /* Hash table maintenance information */
747 struct hlist_node uidhash_node
;
750 #ifdef CONFIG_PERF_EVENTS
751 atomic_long_t locked_vm
;
755 extern int uids_sysfs_init(void);
757 extern struct user_struct
*find_user(kuid_t
);
759 extern struct user_struct root_user
;
760 #define INIT_USER (&root_user)
763 struct backing_dev_info
;
764 struct reclaim_state
;
766 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
768 /* cumulative counters */
769 unsigned long pcount
; /* # of times run on this cpu */
770 unsigned long long run_delay
; /* time spent waiting on a runqueue */
773 unsigned long long last_arrival
,/* when we last ran on a cpu */
774 last_queued
; /* when we were last queued to run */
776 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
778 #ifdef CONFIG_TASK_DELAY_ACCT
779 struct task_delay_info
{
781 unsigned int flags
; /* Private per-task flags */
783 /* For each stat XXX, add following, aligned appropriately
785 * struct timespec XXX_start, XXX_end;
789 * Atomicity of updates to XXX_delay, XXX_count protected by
790 * single lock above (split into XXX_lock if contention is an issue).
794 * XXX_count is incremented on every XXX operation, the delay
795 * associated with the operation is added to XXX_delay.
796 * XXX_delay contains the accumulated delay time in nanoseconds.
798 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
799 u64 blkio_delay
; /* wait for sync block io completion */
800 u64 swapin_delay
; /* wait for swapin block io completion */
801 u32 blkio_count
; /* total count of the number of sync block */
802 /* io operations performed */
803 u32 swapin_count
; /* total count of the number of swapin block */
804 /* io operations performed */
806 struct timespec freepages_start
, freepages_end
;
807 u64 freepages_delay
; /* wait for memory reclaim */
808 u32 freepages_count
; /* total count of memory reclaim */
810 #endif /* CONFIG_TASK_DELAY_ACCT */
812 static inline int sched_info_on(void)
814 #ifdef CONFIG_SCHEDSTATS
816 #elif defined(CONFIG_TASK_DELAY_ACCT)
817 extern int delayacct_on
;
832 * Increase resolution of cpu_power calculations
834 #define SCHED_POWER_SHIFT 10
835 #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
838 * sched-domains (multiprocessor balancing) declarations:
841 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
842 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
843 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
844 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
845 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
846 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
847 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
848 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
849 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
850 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
851 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
852 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
853 #define SD_NUMA 0x4000 /* cross-node balancing */
855 extern int __weak
arch_sd_sibiling_asym_packing(void);
857 struct sched_domain_attr
{
858 int relax_domain_level
;
861 #define SD_ATTR_INIT (struct sched_domain_attr) { \
862 .relax_domain_level = -1, \
865 extern int sched_domain_level_max
;
869 struct sched_domain
{
870 /* These fields must be setup */
871 struct sched_domain
*parent
; /* top domain must be null terminated */
872 struct sched_domain
*child
; /* bottom domain must be null terminated */
873 struct sched_group
*groups
; /* the balancing groups of the domain */
874 unsigned long min_interval
; /* Minimum balance interval ms */
875 unsigned long max_interval
; /* Maximum balance interval ms */
876 unsigned int busy_factor
; /* less balancing by factor if busy */
877 unsigned int imbalance_pct
; /* No balance until over watermark */
878 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
879 unsigned int busy_idx
;
880 unsigned int idle_idx
;
881 unsigned int newidle_idx
;
882 unsigned int wake_idx
;
883 unsigned int forkexec_idx
;
884 unsigned int smt_gain
;
886 int nohz_idle
; /* NOHZ IDLE status */
887 int flags
; /* See SD_* */
890 /* Runtime fields. */
891 unsigned long last_balance
; /* init to jiffies. units in jiffies */
892 unsigned int balance_interval
; /* initialise to 1. units in ms. */
893 unsigned int nr_balance_failed
; /* initialise to 0 */
895 /* idle_balance() stats */
896 u64 max_newidle_lb_cost
;
897 unsigned long next_decay_max_lb_cost
;
899 #ifdef CONFIG_SCHEDSTATS
900 /* load_balance() stats */
901 unsigned int lb_count
[CPU_MAX_IDLE_TYPES
];
902 unsigned int lb_failed
[CPU_MAX_IDLE_TYPES
];
903 unsigned int lb_balanced
[CPU_MAX_IDLE_TYPES
];
904 unsigned int lb_imbalance
[CPU_MAX_IDLE_TYPES
];
905 unsigned int lb_gained
[CPU_MAX_IDLE_TYPES
];
906 unsigned int lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
907 unsigned int lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
908 unsigned int lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
910 /* Active load balancing */
911 unsigned int alb_count
;
912 unsigned int alb_failed
;
913 unsigned int alb_pushed
;
915 /* SD_BALANCE_EXEC stats */
916 unsigned int sbe_count
;
917 unsigned int sbe_balanced
;
918 unsigned int sbe_pushed
;
920 /* SD_BALANCE_FORK stats */
921 unsigned int sbf_count
;
922 unsigned int sbf_balanced
;
923 unsigned int sbf_pushed
;
925 /* try_to_wake_up() stats */
926 unsigned int ttwu_wake_remote
;
927 unsigned int ttwu_move_affine
;
928 unsigned int ttwu_move_balance
;
930 #ifdef CONFIG_SCHED_DEBUG
934 void *private; /* used during construction */
935 struct rcu_head rcu
; /* used during destruction */
938 unsigned int span_weight
;
940 * Span of all CPUs in this domain.
942 * NOTE: this field is variable length. (Allocated dynamically
943 * by attaching extra space to the end of the structure,
944 * depending on how many CPUs the kernel has booted up with)
946 unsigned long span
[0];
949 static inline struct cpumask
*sched_domain_span(struct sched_domain
*sd
)
951 return to_cpumask(sd
->span
);
954 extern void partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
955 struct sched_domain_attr
*dattr_new
);
957 /* Allocate an array of sched domains, for partition_sched_domains(). */
958 cpumask_var_t
*alloc_sched_domains(unsigned int ndoms
);
959 void free_sched_domains(cpumask_var_t doms
[], unsigned int ndoms
);
961 bool cpus_share_cache(int this_cpu
, int that_cpu
);
963 #else /* CONFIG_SMP */
965 struct sched_domain_attr
;
968 partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
969 struct sched_domain_attr
*dattr_new
)
973 static inline bool cpus_share_cache(int this_cpu
, int that_cpu
)
978 #endif /* !CONFIG_SMP */
981 struct io_context
; /* See blkdev.h */
984 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
985 extern void prefetch_stack(struct task_struct
*t
);
987 static inline void prefetch_stack(struct task_struct
*t
) { }
990 struct audit_context
; /* See audit.c */
992 struct pipe_inode_info
;
993 struct uts_namespace
;
996 unsigned long weight
;
1002 * These sums represent an infinite geometric series and so are bound
1003 * above by 1024/(1-y). Thus we only need a u32 to store them for all
1004 * choices of y < 1-2^(-32)*1024.
1006 u32 runnable_avg_sum
, runnable_avg_period
;
1007 u64 last_runnable_update
;
1009 unsigned long load_avg_contrib
;
1012 #ifdef CONFIG_SCHEDSTATS
1013 struct sched_statistics
{
1023 s64 sum_sleep_runtime
;
1030 u64 nr_migrations_cold
;
1031 u64 nr_failed_migrations_affine
;
1032 u64 nr_failed_migrations_running
;
1033 u64 nr_failed_migrations_hot
;
1034 u64 nr_forced_migrations
;
1037 u64 nr_wakeups_sync
;
1038 u64 nr_wakeups_migrate
;
1039 u64 nr_wakeups_local
;
1040 u64 nr_wakeups_remote
;
1041 u64 nr_wakeups_affine
;
1042 u64 nr_wakeups_affine_attempts
;
1043 u64 nr_wakeups_passive
;
1044 u64 nr_wakeups_idle
;
1048 struct sched_entity
{
1049 struct load_weight load
; /* for load-balancing */
1050 struct rb_node run_node
;
1051 struct list_head group_node
;
1055 u64 sum_exec_runtime
;
1057 u64 prev_sum_exec_runtime
;
1061 #ifdef CONFIG_SCHEDSTATS
1062 struct sched_statistics statistics
;
1065 #ifdef CONFIG_FAIR_GROUP_SCHED
1066 struct sched_entity
*parent
;
1067 /* rq on which this entity is (to be) queued: */
1068 struct cfs_rq
*cfs_rq
;
1069 /* rq "owned" by this entity/group: */
1070 struct cfs_rq
*my_q
;
1074 /* Per-entity load-tracking */
1075 struct sched_avg avg
;
1079 struct sched_rt_entity
{
1080 struct list_head run_list
;
1081 unsigned long timeout
;
1082 unsigned long watchdog_stamp
;
1083 unsigned int time_slice
;
1085 struct sched_rt_entity
*back
;
1086 #ifdef CONFIG_RT_GROUP_SCHED
1087 struct sched_rt_entity
*parent
;
1088 /* rq on which this entity is (to be) queued: */
1089 struct rt_rq
*rt_rq
;
1090 /* rq "owned" by this entity/group: */
1095 struct sched_dl_entity
{
1096 struct rb_node rb_node
;
1099 * Original scheduling parameters. Copied here from sched_attr
1100 * during sched_setscheduler2(), they will remain the same until
1101 * the next sched_setscheduler2().
1103 u64 dl_runtime
; /* maximum runtime for each instance */
1104 u64 dl_deadline
; /* relative deadline of each instance */
1107 * Actual scheduling parameters. Initialized with the values above,
1108 * they are continously updated during task execution. Note that
1109 * the remaining runtime could be < 0 in case we are in overrun.
1111 s64 runtime
; /* remaining runtime for this instance */
1112 u64 deadline
; /* absolute deadline for this instance */
1113 unsigned int flags
; /* specifying the scheduler behaviour */
1118 * @dl_throttled tells if we exhausted the runtime. If so, the
1119 * task has to wait for a replenishment to be performed at the
1120 * next firing of dl_timer.
1122 * @dl_new tells if a new instance arrived. If so we must
1123 * start executing it with full runtime and reset its absolute
1126 int dl_throttled
, dl_new
;
1129 * Bandwidth enforcement timer. Each -deadline task has its
1130 * own bandwidth to be enforced, thus we need one timer per task.
1132 struct hrtimer dl_timer
;
1137 enum perf_event_task_context
{
1138 perf_invalid_context
= -1,
1139 perf_hw_context
= 0,
1141 perf_nr_task_contexts
,
1144 struct task_struct
{
1145 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
1148 unsigned int flags
; /* per process flags, defined below */
1149 unsigned int ptrace
;
1152 struct llist_node wake_entry
;
1154 struct task_struct
*last_wakee
;
1155 unsigned long wakee_flips
;
1156 unsigned long wakee_flip_decay_ts
;
1162 int prio
, static_prio
, normal_prio
;
1163 unsigned int rt_priority
;
1164 const struct sched_class
*sched_class
;
1165 struct sched_entity se
;
1166 struct sched_rt_entity rt
;
1167 #ifdef CONFIG_CGROUP_SCHED
1168 struct task_group
*sched_task_group
;
1170 struct sched_dl_entity dl
;
1172 #ifdef CONFIG_PREEMPT_NOTIFIERS
1173 /* list of struct preempt_notifier: */
1174 struct hlist_head preempt_notifiers
;
1177 #ifdef CONFIG_BLK_DEV_IO_TRACE
1178 unsigned int btrace_seq
;
1181 unsigned int policy
;
1182 int nr_cpus_allowed
;
1183 cpumask_t cpus_allowed
;
1185 #ifdef CONFIG_PREEMPT_RCU
1186 int rcu_read_lock_nesting
;
1187 char rcu_read_unlock_special
;
1188 struct list_head rcu_node_entry
;
1189 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1190 #ifdef CONFIG_TREE_PREEMPT_RCU
1191 struct rcu_node
*rcu_blocked_node
;
1192 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1193 #ifdef CONFIG_RCU_BOOST
1194 struct rt_mutex
*rcu_boost_mutex
;
1195 #endif /* #ifdef CONFIG_RCU_BOOST */
1197 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1198 struct sched_info sched_info
;
1201 struct list_head tasks
;
1203 struct plist_node pushable_tasks
;
1206 struct mm_struct
*mm
, *active_mm
;
1207 #ifdef CONFIG_COMPAT_BRK
1208 unsigned brk_randomized
:1;
1210 #if defined(SPLIT_RSS_COUNTING)
1211 struct task_rss_stat rss_stat
;
1215 int exit_code
, exit_signal
;
1216 int pdeath_signal
; /* The signal sent when the parent dies */
1217 unsigned int jobctl
; /* JOBCTL_*, siglock protected */
1219 /* Used for emulating ABI behavior of previous Linux versions */
1220 unsigned int personality
;
1222 unsigned did_exec
:1;
1223 unsigned in_execve
:1; /* Tell the LSMs that the process is doing an
1225 unsigned in_iowait
:1;
1227 /* task may not gain privileges */
1228 unsigned no_new_privs
:1;
1230 /* Revert to default priority/policy when forking */
1231 unsigned sched_reset_on_fork
:1;
1232 unsigned sched_contributes_to_load
:1;
1237 #ifdef CONFIG_CC_STACKPROTECTOR
1238 /* Canary value for the -fstack-protector gcc feature */
1239 unsigned long stack_canary
;
1242 * pointers to (original) parent process, youngest child, younger sibling,
1243 * older sibling, respectively. (p->father can be replaced with
1244 * p->real_parent->pid)
1246 struct task_struct __rcu
*real_parent
; /* real parent process */
1247 struct task_struct __rcu
*parent
; /* recipient of SIGCHLD, wait4() reports */
1249 * children/sibling forms the list of my natural children
1251 struct list_head children
; /* list of my children */
1252 struct list_head sibling
; /* linkage in my parent's children list */
1253 struct task_struct
*group_leader
; /* threadgroup leader */
1256 * ptraced is the list of tasks this task is using ptrace on.
1257 * This includes both natural children and PTRACE_ATTACH targets.
1258 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1260 struct list_head ptraced
;
1261 struct list_head ptrace_entry
;
1263 /* PID/PID hash table linkage. */
1264 struct pid_link pids
[PIDTYPE_MAX
];
1265 struct list_head thread_group
;
1267 struct completion
*vfork_done
; /* for vfork() */
1268 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
1269 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
1271 cputime_t utime
, stime
, utimescaled
, stimescaled
;
1273 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
1274 struct cputime prev_cputime
;
1276 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1277 seqlock_t vtime_seqlock
;
1278 unsigned long long vtime_snap
;
1283 } vtime_snap_whence
;
1285 unsigned long nvcsw
, nivcsw
; /* context switch counts */
1286 struct timespec start_time
; /* monotonic time */
1287 struct timespec real_start_time
; /* boot based time */
1288 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1289 unsigned long min_flt
, maj_flt
;
1291 struct task_cputime cputime_expires
;
1292 struct list_head cpu_timers
[3];
1294 /* process credentials */
1295 const struct cred __rcu
*real_cred
; /* objective and real subjective task
1296 * credentials (COW) */
1297 const struct cred __rcu
*cred
; /* effective (overridable) subjective task
1298 * credentials (COW) */
1299 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
1300 - access with [gs]et_task_comm (which lock
1301 it with task_lock())
1302 - initialized normally by setup_new_exec */
1303 /* file system info */
1304 int link_count
, total_link_count
;
1305 #ifdef CONFIG_SYSVIPC
1307 struct sysv_sem sysvsem
;
1309 #ifdef CONFIG_DETECT_HUNG_TASK
1310 /* hung task detection */
1311 unsigned long last_switch_count
;
1313 /* CPU-specific state of this task */
1314 struct thread_struct thread
;
1315 /* filesystem information */
1316 struct fs_struct
*fs
;
1317 /* open file information */
1318 struct files_struct
*files
;
1320 struct nsproxy
*nsproxy
;
1321 /* signal handlers */
1322 struct signal_struct
*signal
;
1323 struct sighand_struct
*sighand
;
1325 sigset_t blocked
, real_blocked
;
1326 sigset_t saved_sigmask
; /* restored if set_restore_sigmask() was used */
1327 struct sigpending pending
;
1329 unsigned long sas_ss_sp
;
1331 int (*notifier
)(void *priv
);
1332 void *notifier_data
;
1333 sigset_t
*notifier_mask
;
1334 struct callback_head
*task_works
;
1336 struct audit_context
*audit_context
;
1337 #ifdef CONFIG_AUDITSYSCALL
1339 unsigned int sessionid
;
1341 struct seccomp seccomp
;
1343 /* Thread group tracking */
1346 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1348 spinlock_t alloc_lock
;
1350 /* Protection of the PI data structures: */
1351 raw_spinlock_t pi_lock
;
1353 #ifdef CONFIG_RT_MUTEXES
1354 /* PI waiters blocked on a rt_mutex held by this task */
1355 struct plist_head pi_waiters
;
1356 /* Deadlock detection and priority inheritance handling */
1357 struct rt_mutex_waiter
*pi_blocked_on
;
1360 #ifdef CONFIG_DEBUG_MUTEXES
1361 /* mutex deadlock detection */
1362 struct mutex_waiter
*blocked_on
;
1364 #ifdef CONFIG_TRACE_IRQFLAGS
1365 unsigned int irq_events
;
1366 unsigned long hardirq_enable_ip
;
1367 unsigned long hardirq_disable_ip
;
1368 unsigned int hardirq_enable_event
;
1369 unsigned int hardirq_disable_event
;
1370 int hardirqs_enabled
;
1371 int hardirq_context
;
1372 unsigned long softirq_disable_ip
;
1373 unsigned long softirq_enable_ip
;
1374 unsigned int softirq_disable_event
;
1375 unsigned int softirq_enable_event
;
1376 int softirqs_enabled
;
1377 int softirq_context
;
1379 #ifdef CONFIG_LOCKDEP
1380 # define MAX_LOCK_DEPTH 48UL
1383 unsigned int lockdep_recursion
;
1384 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1385 gfp_t lockdep_reclaim_gfp
;
1388 /* journalling filesystem info */
1391 /* stacked block device info */
1392 struct bio_list
*bio_list
;
1395 /* stack plugging */
1396 struct blk_plug
*plug
;
1400 struct reclaim_state
*reclaim_state
;
1402 struct backing_dev_info
*backing_dev_info
;
1404 struct io_context
*io_context
;
1406 unsigned long ptrace_message
;
1407 siginfo_t
*last_siginfo
; /* For ptrace use. */
1408 struct task_io_accounting ioac
;
1409 #if defined(CONFIG_TASK_XACCT)
1410 u64 acct_rss_mem1
; /* accumulated rss usage */
1411 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1412 cputime_t acct_timexpd
; /* stime + utime since last update */
1414 #ifdef CONFIG_CPUSETS
1415 nodemask_t mems_allowed
; /* Protected by alloc_lock */
1416 seqcount_t mems_allowed_seq
; /* Seqence no to catch updates */
1417 int cpuset_mem_spread_rotor
;
1418 int cpuset_slab_spread_rotor
;
1420 #ifdef CONFIG_CGROUPS
1421 /* Control Group info protected by css_set_lock */
1422 struct css_set __rcu
*cgroups
;
1423 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1424 struct list_head cg_list
;
1427 struct robust_list_head __user
*robust_list
;
1428 #ifdef CONFIG_COMPAT
1429 struct compat_robust_list_head __user
*compat_robust_list
;
1431 struct list_head pi_state_list
;
1432 struct futex_pi_state
*pi_state_cache
;
1434 #ifdef CONFIG_PERF_EVENTS
1435 struct perf_event_context
*perf_event_ctxp
[perf_nr_task_contexts
];
1436 struct mutex perf_event_mutex
;
1437 struct list_head perf_event_list
;
1440 struct mempolicy
*mempolicy
; /* Protected by alloc_lock */
1442 short pref_node_fork
;
1444 #ifdef CONFIG_NUMA_BALANCING
1446 unsigned int numa_scan_period
;
1447 unsigned int numa_scan_period_max
;
1448 int numa_preferred_nid
;
1449 int numa_migrate_deferred
;
1450 unsigned long numa_migrate_retry
;
1451 u64 node_stamp
; /* migration stamp */
1452 struct callback_head numa_work
;
1454 struct list_head numa_entry
;
1455 struct numa_group
*numa_group
;
1458 * Exponential decaying average of faults on a per-node basis.
1459 * Scheduling placement decisions are made based on the these counts.
1460 * The values remain static for the duration of a PTE scan
1462 unsigned long *numa_faults
;
1463 unsigned long total_numa_faults
;
1466 * numa_faults_buffer records faults per node during the current
1467 * scan window. When the scan completes, the counts in numa_faults
1468 * decay and these values are copied.
1470 unsigned long *numa_faults_buffer
;
1473 * numa_faults_locality tracks if faults recorded during the last
1474 * scan window were remote/local. The task scan period is adapted
1475 * based on the locality of the faults with different weights
1476 * depending on whether they were shared or private faults
1478 unsigned long numa_faults_locality
[2];
1480 unsigned long numa_pages_migrated
;
1481 #endif /* CONFIG_NUMA_BALANCING */
1483 struct rcu_head rcu
;
1486 * cache last used pipe for splice
1488 struct pipe_inode_info
*splice_pipe
;
1490 struct page_frag task_frag
;
1492 #ifdef CONFIG_TASK_DELAY_ACCT
1493 struct task_delay_info
*delays
;
1495 #ifdef CONFIG_FAULT_INJECTION
1499 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1500 * balance_dirty_pages() for some dirty throttling pause
1503 int nr_dirtied_pause
;
1504 unsigned long dirty_paused_when
; /* start of a write-and-pause period */
1506 #ifdef CONFIG_LATENCYTOP
1507 int latency_record_count
;
1508 struct latency_record latency_record
[LT_SAVECOUNT
];
1511 * time slack values; these are used to round up poll() and
1512 * select() etc timeout values. These are in nanoseconds.
1514 unsigned long timer_slack_ns
;
1515 unsigned long default_timer_slack_ns
;
1517 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1518 /* Index of current stored address in ret_stack */
1520 /* Stack of return addresses for return function tracing */
1521 struct ftrace_ret_stack
*ret_stack
;
1522 /* time stamp for last schedule */
1523 unsigned long long ftrace_timestamp
;
1525 * Number of functions that haven't been traced
1526 * because of depth overrun.
1528 atomic_t trace_overrun
;
1529 /* Pause for the tracing */
1530 atomic_t tracing_graph_pause
;
1532 #ifdef CONFIG_TRACING
1533 /* state flags for use by tracers */
1534 unsigned long trace
;
1535 /* bitmask and counter of trace recursion */
1536 unsigned long trace_recursion
;
1537 #endif /* CONFIG_TRACING */
1538 #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
1539 struct memcg_batch_info
{
1540 int do_batch
; /* incremented when batch uncharge started */
1541 struct mem_cgroup
*memcg
; /* target memcg of uncharge */
1542 unsigned long nr_pages
; /* uncharged usage */
1543 unsigned long memsw_nr_pages
; /* uncharged mem+swap usage */
1545 unsigned int memcg_kmem_skip_account
;
1546 struct memcg_oom_info
{
1547 struct mem_cgroup
*memcg
;
1550 unsigned int may_oom
:1;
1553 #ifdef CONFIG_UPROBES
1554 struct uprobe_task
*utask
;
1556 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1557 unsigned int sequential_io
;
1558 unsigned int sequential_io_avg
;
1562 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1563 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1565 #define TNF_MIGRATED 0x01
1566 #define TNF_NO_GROUP 0x02
1567 #define TNF_SHARED 0x04
1568 #define TNF_FAULT_LOCAL 0x08
1570 #ifdef CONFIG_NUMA_BALANCING
1571 extern void task_numa_fault(int last_node
, int node
, int pages
, int flags
);
1572 extern pid_t
task_numa_group_id(struct task_struct
*p
);
1573 extern void set_numabalancing_state(bool enabled
);
1574 extern void task_numa_free(struct task_struct
*p
);
1576 extern unsigned int sysctl_numa_balancing_migrate_deferred
;
1578 static inline void task_numa_fault(int last_node
, int node
, int pages
,
1582 static inline pid_t
task_numa_group_id(struct task_struct
*p
)
1586 static inline void set_numabalancing_state(bool enabled
)
1589 static inline void task_numa_free(struct task_struct
*p
)
1594 static inline struct pid
*task_pid(struct task_struct
*task
)
1596 return task
->pids
[PIDTYPE_PID
].pid
;
1599 static inline struct pid
*task_tgid(struct task_struct
*task
)
1601 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1605 * Without tasklist or rcu lock it is not safe to dereference
1606 * the result of task_pgrp/task_session even if task == current,
1607 * we can race with another thread doing sys_setsid/sys_setpgid.
1609 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1611 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1614 static inline struct pid
*task_session(struct task_struct
*task
)
1616 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1619 struct pid_namespace
;
1622 * the helpers to get the task's different pids as they are seen
1623 * from various namespaces
1625 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1626 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1628 * task_xid_nr_ns() : id seen from the ns specified;
1630 * set_task_vxid() : assigns a virtual id to a task;
1632 * see also pid_nr() etc in include/linux/pid.h
1634 pid_t
__task_pid_nr_ns(struct task_struct
*task
, enum pid_type type
,
1635 struct pid_namespace
*ns
);
1637 static inline pid_t
task_pid_nr(struct task_struct
*tsk
)
1642 static inline pid_t
task_pid_nr_ns(struct task_struct
*tsk
,
1643 struct pid_namespace
*ns
)
1645 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, ns
);
1648 static inline pid_t
task_pid_vnr(struct task_struct
*tsk
)
1650 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, NULL
);
1654 static inline pid_t
task_tgid_nr(struct task_struct
*tsk
)
1659 pid_t
task_tgid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1661 static inline pid_t
task_tgid_vnr(struct task_struct
*tsk
)
1663 return pid_vnr(task_tgid(tsk
));
1667 static inline pid_t
task_pgrp_nr_ns(struct task_struct
*tsk
,
1668 struct pid_namespace
*ns
)
1670 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, ns
);
1673 static inline pid_t
task_pgrp_vnr(struct task_struct
*tsk
)
1675 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, NULL
);
1679 static inline pid_t
task_session_nr_ns(struct task_struct
*tsk
,
1680 struct pid_namespace
*ns
)
1682 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, ns
);
1685 static inline pid_t
task_session_vnr(struct task_struct
*tsk
)
1687 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, NULL
);
1690 /* obsolete, do not use */
1691 static inline pid_t
task_pgrp_nr(struct task_struct
*tsk
)
1693 return task_pgrp_nr_ns(tsk
, &init_pid_ns
);
1697 * pid_alive - check that a task structure is not stale
1698 * @p: Task structure to be checked.
1700 * Test if a process is not yet dead (at most zombie state)
1701 * If pid_alive fails, then pointers within the task structure
1702 * can be stale and must not be dereferenced.
1704 * Return: 1 if the process is alive. 0 otherwise.
1706 static inline int pid_alive(struct task_struct
*p
)
1708 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1712 * is_global_init - check if a task structure is init
1713 * @tsk: Task structure to be checked.
1715 * Check if a task structure is the first user space task the kernel created.
1717 * Return: 1 if the task structure is init. 0 otherwise.
1719 static inline int is_global_init(struct task_struct
*tsk
)
1721 return tsk
->pid
== 1;
1724 extern struct pid
*cad_pid
;
1726 extern void free_task(struct task_struct
*tsk
);
1727 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1729 extern void __put_task_struct(struct task_struct
*t
);
1731 static inline void put_task_struct(struct task_struct
*t
)
1733 if (atomic_dec_and_test(&t
->usage
))
1734 __put_task_struct(t
);
1737 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1738 extern void task_cputime(struct task_struct
*t
,
1739 cputime_t
*utime
, cputime_t
*stime
);
1740 extern void task_cputime_scaled(struct task_struct
*t
,
1741 cputime_t
*utimescaled
, cputime_t
*stimescaled
);
1742 extern cputime_t
task_gtime(struct task_struct
*t
);
1744 static inline void task_cputime(struct task_struct
*t
,
1745 cputime_t
*utime
, cputime_t
*stime
)
1753 static inline void task_cputime_scaled(struct task_struct
*t
,
1754 cputime_t
*utimescaled
,
1755 cputime_t
*stimescaled
)
1758 *utimescaled
= t
->utimescaled
;
1760 *stimescaled
= t
->stimescaled
;
1763 static inline cputime_t
task_gtime(struct task_struct
*t
)
1768 extern void task_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
1769 extern void thread_group_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
1774 #define PF_EXITING 0x00000004 /* getting shut down */
1775 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1776 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1777 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1778 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1779 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1780 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1781 #define PF_DUMPCORE 0x00000200 /* dumped core */
1782 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1783 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1784 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1785 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1786 #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */
1787 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1788 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1789 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1790 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1791 #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */
1792 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1793 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1794 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1795 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1796 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1797 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1798 #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */
1799 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1800 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1801 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1802 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1803 #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */
1806 * Only the _current_ task can read/write to tsk->flags, but other
1807 * tasks can access tsk->flags in readonly mode for example
1808 * with tsk_used_math (like during threaded core dumping).
1809 * There is however an exception to this rule during ptrace
1810 * or during fork: the ptracer task is allowed to write to the
1811 * child->flags of its traced child (same goes for fork, the parent
1812 * can write to the child->flags), because we're guaranteed the
1813 * child is not running and in turn not changing child->flags
1814 * at the same time the parent does it.
1816 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1817 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1818 #define clear_used_math() clear_stopped_child_used_math(current)
1819 #define set_used_math() set_stopped_child_used_math(current)
1820 #define conditional_stopped_child_used_math(condition, child) \
1821 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1822 #define conditional_used_math(condition) \
1823 conditional_stopped_child_used_math(condition, current)
1824 #define copy_to_stopped_child_used_math(child) \
1825 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1826 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1827 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1828 #define used_math() tsk_used_math(current)
1830 /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags */
1831 static inline gfp_t
memalloc_noio_flags(gfp_t flags
)
1833 if (unlikely(current
->flags
& PF_MEMALLOC_NOIO
))
1838 static inline unsigned int memalloc_noio_save(void)
1840 unsigned int flags
= current
->flags
& PF_MEMALLOC_NOIO
;
1841 current
->flags
|= PF_MEMALLOC_NOIO
;
1845 static inline void memalloc_noio_restore(unsigned int flags
)
1847 current
->flags
= (current
->flags
& ~PF_MEMALLOC_NOIO
) | flags
;
1851 * task->jobctl flags
1853 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1855 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1856 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1857 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1858 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1859 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1860 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1861 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1863 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1864 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
1865 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
1866 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
1867 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
1868 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
1869 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
1871 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1872 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
1874 extern bool task_set_jobctl_pending(struct task_struct
*task
,
1876 extern void task_clear_jobctl_trapping(struct task_struct
*task
);
1877 extern void task_clear_jobctl_pending(struct task_struct
*task
,
1880 #ifdef CONFIG_PREEMPT_RCU
1882 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1883 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1885 static inline void rcu_copy_process(struct task_struct
*p
)
1887 p
->rcu_read_lock_nesting
= 0;
1888 p
->rcu_read_unlock_special
= 0;
1889 #ifdef CONFIG_TREE_PREEMPT_RCU
1890 p
->rcu_blocked_node
= NULL
;
1891 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1892 #ifdef CONFIG_RCU_BOOST
1893 p
->rcu_boost_mutex
= NULL
;
1894 #endif /* #ifdef CONFIG_RCU_BOOST */
1895 INIT_LIST_HEAD(&p
->rcu_node_entry
);
1900 static inline void rcu_copy_process(struct task_struct
*p
)
1906 static inline void tsk_restore_flags(struct task_struct
*task
,
1907 unsigned long orig_flags
, unsigned long flags
)
1909 task
->flags
&= ~flags
;
1910 task
->flags
|= orig_flags
& flags
;
1914 extern void do_set_cpus_allowed(struct task_struct
*p
,
1915 const struct cpumask
*new_mask
);
1917 extern int set_cpus_allowed_ptr(struct task_struct
*p
,
1918 const struct cpumask
*new_mask
);
1920 static inline void do_set_cpus_allowed(struct task_struct
*p
,
1921 const struct cpumask
*new_mask
)
1924 static inline int set_cpus_allowed_ptr(struct task_struct
*p
,
1925 const struct cpumask
*new_mask
)
1927 if (!cpumask_test_cpu(0, new_mask
))
1933 #ifdef CONFIG_NO_HZ_COMMON
1934 void calc_load_enter_idle(void);
1935 void calc_load_exit_idle(void);
1937 static inline void calc_load_enter_idle(void) { }
1938 static inline void calc_load_exit_idle(void) { }
1939 #endif /* CONFIG_NO_HZ_COMMON */
1941 #ifndef CONFIG_CPUMASK_OFFSTACK
1942 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1944 return set_cpus_allowed_ptr(p
, &new_mask
);
1949 * Do not use outside of architecture code which knows its limitations.
1951 * sched_clock() has no promise of monotonicity or bounded drift between
1952 * CPUs, use (which you should not) requires disabling IRQs.
1954 * Please use one of the three interfaces below.
1956 extern unsigned long long notrace
sched_clock(void);
1958 * See the comment in kernel/sched/clock.c
1960 extern u64
cpu_clock(int cpu
);
1961 extern u64
local_clock(void);
1962 extern u64
sched_clock_cpu(int cpu
);
1965 extern void sched_clock_init(void);
1967 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1968 static inline void sched_clock_tick(void)
1972 static inline void sched_clock_idle_sleep_event(void)
1976 static inline void sched_clock_idle_wakeup_event(u64 delta_ns
)
1981 * Architectures can set this to 1 if they have specified
1982 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1983 * but then during bootup it turns out that sched_clock()
1984 * is reliable after all:
1986 extern int sched_clock_stable
;
1988 extern void sched_clock_tick(void);
1989 extern void sched_clock_idle_sleep_event(void);
1990 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1993 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1995 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1996 * The reason for this explicit opt-in is not to have perf penalty with
1997 * slow sched_clocks.
1999 extern void enable_sched_clock_irqtime(void);
2000 extern void disable_sched_clock_irqtime(void);
2002 static inline void enable_sched_clock_irqtime(void) {}
2003 static inline void disable_sched_clock_irqtime(void) {}
2006 extern unsigned long long
2007 task_sched_runtime(struct task_struct
*task
);
2009 /* sched_exec is called by processes performing an exec */
2011 extern void sched_exec(void);
2013 #define sched_exec() {}
2016 extern void sched_clock_idle_sleep_event(void);
2017 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
2019 #ifdef CONFIG_HOTPLUG_CPU
2020 extern void idle_task_exit(void);
2022 static inline void idle_task_exit(void) {}
2025 #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
2026 extern void wake_up_nohz_cpu(int cpu
);
2028 static inline void wake_up_nohz_cpu(int cpu
) { }
2031 #ifdef CONFIG_NO_HZ_FULL
2032 extern bool sched_can_stop_tick(void);
2033 extern u64
scheduler_tick_max_deferment(void);
2035 static inline bool sched_can_stop_tick(void) { return false; }
2038 #ifdef CONFIG_SCHED_AUTOGROUP
2039 extern void sched_autogroup_create_attach(struct task_struct
*p
);
2040 extern void sched_autogroup_detach(struct task_struct
*p
);
2041 extern void sched_autogroup_fork(struct signal_struct
*sig
);
2042 extern void sched_autogroup_exit(struct signal_struct
*sig
);
2043 #ifdef CONFIG_PROC_FS
2044 extern void proc_sched_autogroup_show_task(struct task_struct
*p
, struct seq_file
*m
);
2045 extern int proc_sched_autogroup_set_nice(struct task_struct
*p
, int nice
);
2048 static inline void sched_autogroup_create_attach(struct task_struct
*p
) { }
2049 static inline void sched_autogroup_detach(struct task_struct
*p
) { }
2050 static inline void sched_autogroup_fork(struct signal_struct
*sig
) { }
2051 static inline void sched_autogroup_exit(struct signal_struct
*sig
) { }
2054 extern bool yield_to(struct task_struct
*p
, bool preempt
);
2055 extern void set_user_nice(struct task_struct
*p
, long nice
);
2056 extern int task_prio(const struct task_struct
*p
);
2057 extern int task_nice(const struct task_struct
*p
);
2058 extern int can_nice(const struct task_struct
*p
, const int nice
);
2059 extern int task_curr(const struct task_struct
*p
);
2060 extern int idle_cpu(int cpu
);
2061 extern int sched_setscheduler(struct task_struct
*, int,
2062 const struct sched_param
*);
2063 extern int sched_setscheduler_nocheck(struct task_struct
*, int,
2064 const struct sched_param
*);
2065 extern int sched_setattr(struct task_struct
*,
2066 const struct sched_attr
*);
2067 extern struct task_struct
*idle_task(int cpu
);
2069 * is_idle_task - is the specified task an idle task?
2070 * @p: the task in question.
2072 * Return: 1 if @p is an idle task. 0 otherwise.
2074 static inline bool is_idle_task(const struct task_struct
*p
)
2078 extern struct task_struct
*curr_task(int cpu
);
2079 extern void set_curr_task(int cpu
, struct task_struct
*p
);
2084 * The default (Linux) execution domain.
2086 extern struct exec_domain default_exec_domain
;
2088 union thread_union
{
2089 struct thread_info thread_info
;
2090 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
2093 #ifndef __HAVE_ARCH_KSTACK_END
2094 static inline int kstack_end(void *addr
)
2096 /* Reliable end of stack detection:
2097 * Some APM bios versions misalign the stack
2099 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
2103 extern union thread_union init_thread_union
;
2104 extern struct task_struct init_task
;
2106 extern struct mm_struct init_mm
;
2108 extern struct pid_namespace init_pid_ns
;
2111 * find a task by one of its numerical ids
2113 * find_task_by_pid_ns():
2114 * finds a task by its pid in the specified namespace
2115 * find_task_by_vpid():
2116 * finds a task by its virtual pid
2118 * see also find_vpid() etc in include/linux/pid.h
2121 extern struct task_struct
*find_task_by_vpid(pid_t nr
);
2122 extern struct task_struct
*find_task_by_pid_ns(pid_t nr
,
2123 struct pid_namespace
*ns
);
2125 /* per-UID process charging. */
2126 extern struct user_struct
* alloc_uid(kuid_t
);
2127 static inline struct user_struct
*get_uid(struct user_struct
*u
)
2129 atomic_inc(&u
->__count
);
2132 extern void free_uid(struct user_struct
*);
2134 #include <asm/current.h>
2136 extern void xtime_update(unsigned long ticks
);
2138 extern int wake_up_state(struct task_struct
*tsk
, unsigned int state
);
2139 extern int wake_up_process(struct task_struct
*tsk
);
2140 extern void wake_up_new_task(struct task_struct
*tsk
);
2142 extern void kick_process(struct task_struct
*tsk
);
2144 static inline void kick_process(struct task_struct
*tsk
) { }
2146 extern int sched_fork(unsigned long clone_flags
, struct task_struct
*p
);
2147 extern void sched_dead(struct task_struct
*p
);
2149 extern void proc_caches_init(void);
2150 extern void flush_signals(struct task_struct
*);
2151 extern void __flush_signals(struct task_struct
*);
2152 extern void ignore_signals(struct task_struct
*);
2153 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
2154 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
2156 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
2158 unsigned long flags
;
2161 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
2162 ret
= dequeue_signal(tsk
, mask
, info
);
2163 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
2168 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
2170 extern void unblock_all_signals(void);
2171 extern void release_task(struct task_struct
* p
);
2172 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
2173 extern int force_sigsegv(int, struct task_struct
*);
2174 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
2175 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
2176 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
2177 extern int kill_pid_info_as_cred(int, struct siginfo
*, struct pid
*,
2178 const struct cred
*, u32
);
2179 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
2180 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
2181 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
2182 extern __must_check
bool do_notify_parent(struct task_struct
*, int);
2183 extern void __wake_up_parent(struct task_struct
*p
, struct task_struct
*parent
);
2184 extern void force_sig(int, struct task_struct
*);
2185 extern int send_sig(int, struct task_struct
*, int);
2186 extern int zap_other_threads(struct task_struct
*p
);
2187 extern struct sigqueue
*sigqueue_alloc(void);
2188 extern void sigqueue_free(struct sigqueue
*);
2189 extern int send_sigqueue(struct sigqueue
*, struct task_struct
*, int group
);
2190 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
2192 static inline void restore_saved_sigmask(void)
2194 if (test_and_clear_restore_sigmask())
2195 __set_current_blocked(¤t
->saved_sigmask
);
2198 static inline sigset_t
*sigmask_to_save(void)
2200 sigset_t
*res
= ¤t
->blocked
;
2201 if (unlikely(test_restore_sigmask()))
2202 res
= ¤t
->saved_sigmask
;
2206 static inline int kill_cad_pid(int sig
, int priv
)
2208 return kill_pid(cad_pid
, sig
, priv
);
2211 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2212 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2213 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2214 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2217 * True if we are on the alternate signal stack.
2219 static inline int on_sig_stack(unsigned long sp
)
2221 #ifdef CONFIG_STACK_GROWSUP
2222 return sp
>= current
->sas_ss_sp
&&
2223 sp
- current
->sas_ss_sp
< current
->sas_ss_size
;
2225 return sp
> current
->sas_ss_sp
&&
2226 sp
- current
->sas_ss_sp
<= current
->sas_ss_size
;
2230 static inline int sas_ss_flags(unsigned long sp
)
2232 return (current
->sas_ss_size
== 0 ? SS_DISABLE
2233 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
2236 static inline unsigned long sigsp(unsigned long sp
, struct ksignal
*ksig
)
2238 if (unlikely((ksig
->ka
.sa
.sa_flags
& SA_ONSTACK
)) && ! sas_ss_flags(sp
))
2239 #ifdef CONFIG_STACK_GROWSUP
2240 return current
->sas_ss_sp
;
2242 return current
->sas_ss_sp
+ current
->sas_ss_size
;
2248 * Routines for handling mm_structs
2250 extern struct mm_struct
* mm_alloc(void);
2252 /* mmdrop drops the mm and the page tables */
2253 extern void __mmdrop(struct mm_struct
*);
2254 static inline void mmdrop(struct mm_struct
* mm
)
2256 if (unlikely(atomic_dec_and_test(&mm
->mm_count
)))
2260 /* mmput gets rid of the mappings and all user-space */
2261 extern void mmput(struct mm_struct
*);
2262 /* Grab a reference to a task's mm, if it is not already going away */
2263 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
2265 * Grab a reference to a task's mm, if it is not already going away
2266 * and ptrace_may_access with the mode parameter passed to it
2269 extern struct mm_struct
*mm_access(struct task_struct
*task
, unsigned int mode
);
2270 /* Remove the current tasks stale references to the old mm_struct */
2271 extern void mm_release(struct task_struct
*, struct mm_struct
*);
2272 /* Allocate a new mm structure and copy contents from tsk->mm */
2273 extern struct mm_struct
*dup_mm(struct task_struct
*tsk
);
2275 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2276 struct task_struct
*);
2277 extern void flush_thread(void);
2278 extern void exit_thread(void);
2280 extern void exit_files(struct task_struct
*);
2281 extern void __cleanup_sighand(struct sighand_struct
*);
2283 extern void exit_itimers(struct signal_struct
*);
2284 extern void flush_itimer_signals(void);
2286 extern void do_group_exit(int);
2288 extern int allow_signal(int);
2289 extern int disallow_signal(int);
2291 extern int do_execve(const char *,
2292 const char __user
* const __user
*,
2293 const char __user
* const __user
*);
2294 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user
*, int __user
*);
2295 struct task_struct
*fork_idle(int);
2296 extern pid_t
kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
);
2298 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
2299 extern char *get_task_comm(char *to
, struct task_struct
*tsk
);
2302 void scheduler_ipi(void);
2303 extern unsigned long wait_task_inactive(struct task_struct
*, long match_state
);
2305 static inline void scheduler_ipi(void) { }
2306 static inline unsigned long wait_task_inactive(struct task_struct
*p
,
2313 #define next_task(p) \
2314 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2316 #define for_each_process(p) \
2317 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2319 extern bool current_is_single_threaded(void);
2322 * Careful: do_each_thread/while_each_thread is a double loop so
2323 * 'break' will not work as expected - use goto instead.
2325 #define do_each_thread(g, t) \
2326 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2328 #define while_each_thread(g, t) \
2329 while ((t = next_thread(t)) != g)
2331 static inline int get_nr_threads(struct task_struct
*tsk
)
2333 return tsk
->signal
->nr_threads
;
2336 static inline bool thread_group_leader(struct task_struct
*p
)
2338 return p
->exit_signal
>= 0;
2341 /* Do to the insanities of de_thread it is possible for a process
2342 * to have the pid of the thread group leader without actually being
2343 * the thread group leader. For iteration through the pids in proc
2344 * all we care about is that we have a task with the appropriate
2345 * pid, we don't actually care if we have the right task.
2347 static inline bool has_group_leader_pid(struct task_struct
*p
)
2349 return task_pid(p
) == p
->signal
->leader_pid
;
2353 bool same_thread_group(struct task_struct
*p1
, struct task_struct
*p2
)
2355 return p1
->signal
== p2
->signal
;
2358 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
2360 return list_entry_rcu(p
->thread_group
.next
,
2361 struct task_struct
, thread_group
);
2364 static inline int thread_group_empty(struct task_struct
*p
)
2366 return list_empty(&p
->thread_group
);
2369 #define delay_group_leader(p) \
2370 (thread_group_leader(p) && !thread_group_empty(p))
2373 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2374 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2375 * pins the final release of task.io_context. Also protects ->cpuset and
2376 * ->cgroup.subsys[]. And ->vfork_done.
2378 * Nests both inside and outside of read_lock(&tasklist_lock).
2379 * It must not be nested with write_lock_irq(&tasklist_lock),
2380 * neither inside nor outside.
2382 static inline void task_lock(struct task_struct
*p
)
2384 spin_lock(&p
->alloc_lock
);
2387 static inline void task_unlock(struct task_struct
*p
)
2389 spin_unlock(&p
->alloc_lock
);
2392 extern struct sighand_struct
*__lock_task_sighand(struct task_struct
*tsk
,
2393 unsigned long *flags
);
2395 static inline struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
2396 unsigned long *flags
)
2398 struct sighand_struct
*ret
;
2400 ret
= __lock_task_sighand(tsk
, flags
);
2401 (void)__cond_lock(&tsk
->sighand
->siglock
, ret
);
2405 static inline void unlock_task_sighand(struct task_struct
*tsk
,
2406 unsigned long *flags
)
2408 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
2411 #ifdef CONFIG_CGROUPS
2412 static inline void threadgroup_change_begin(struct task_struct
*tsk
)
2414 down_read(&tsk
->signal
->group_rwsem
);
2416 static inline void threadgroup_change_end(struct task_struct
*tsk
)
2418 up_read(&tsk
->signal
->group_rwsem
);
2422 * threadgroup_lock - lock threadgroup
2423 * @tsk: member task of the threadgroup to lock
2425 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2426 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2427 * change ->group_leader/pid. This is useful for cases where the threadgroup
2428 * needs to stay stable across blockable operations.
2430 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2431 * synchronization. While held, no new task will be added to threadgroup
2432 * and no existing live task will have its PF_EXITING set.
2434 * de_thread() does threadgroup_change_{begin|end}() when a non-leader
2435 * sub-thread becomes a new leader.
2437 static inline void threadgroup_lock(struct task_struct
*tsk
)
2439 down_write(&tsk
->signal
->group_rwsem
);
2443 * threadgroup_unlock - unlock threadgroup
2444 * @tsk: member task of the threadgroup to unlock
2446 * Reverse threadgroup_lock().
2448 static inline void threadgroup_unlock(struct task_struct
*tsk
)
2450 up_write(&tsk
->signal
->group_rwsem
);
2453 static inline void threadgroup_change_begin(struct task_struct
*tsk
) {}
2454 static inline void threadgroup_change_end(struct task_struct
*tsk
) {}
2455 static inline void threadgroup_lock(struct task_struct
*tsk
) {}
2456 static inline void threadgroup_unlock(struct task_struct
*tsk
) {}
2459 #ifndef __HAVE_THREAD_FUNCTIONS
2461 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2462 #define task_stack_page(task) ((task)->stack)
2464 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
2466 *task_thread_info(p
) = *task_thread_info(org
);
2467 task_thread_info(p
)->task
= p
;
2470 static inline unsigned long *end_of_stack(struct task_struct
*p
)
2472 return (unsigned long *)(task_thread_info(p
) + 1);
2477 static inline int object_is_on_stack(void *obj
)
2479 void *stack
= task_stack_page(current
);
2481 return (obj
>= stack
) && (obj
< (stack
+ THREAD_SIZE
));
2484 extern void thread_info_cache_init(void);
2486 #ifdef CONFIG_DEBUG_STACK_USAGE
2487 static inline unsigned long stack_not_used(struct task_struct
*p
)
2489 unsigned long *n
= end_of_stack(p
);
2491 do { /* Skip over canary */
2495 return (unsigned long)n
- (unsigned long)end_of_stack(p
);
2499 /* set thread flags in other task's structures
2500 * - see asm/thread_info.h for TIF_xxxx flags available
2502 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2504 set_ti_thread_flag(task_thread_info(tsk
), flag
);
2507 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2509 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2512 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2514 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
2517 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2519 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2522 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2524 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
2527 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
2529 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2532 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
2534 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2537 static inline int test_tsk_need_resched(struct task_struct
*tsk
)
2539 return unlikely(test_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
));
2542 static inline int restart_syscall(void)
2544 set_tsk_thread_flag(current
, TIF_SIGPENDING
);
2545 return -ERESTARTNOINTR
;
2548 static inline int signal_pending(struct task_struct
*p
)
2550 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
2553 static inline int __fatal_signal_pending(struct task_struct
*p
)
2555 return unlikely(sigismember(&p
->pending
.signal
, SIGKILL
));
2558 static inline int fatal_signal_pending(struct task_struct
*p
)
2560 return signal_pending(p
) && __fatal_signal_pending(p
);
2563 static inline int signal_pending_state(long state
, struct task_struct
*p
)
2565 if (!(state
& (TASK_INTERRUPTIBLE
| TASK_WAKEKILL
)))
2567 if (!signal_pending(p
))
2570 return (state
& TASK_INTERRUPTIBLE
) || __fatal_signal_pending(p
);
2574 * cond_resched() and cond_resched_lock(): latency reduction via
2575 * explicit rescheduling in places that are safe. The return
2576 * value indicates whether a reschedule was done in fact.
2577 * cond_resched_lock() will drop the spinlock before scheduling,
2578 * cond_resched_softirq() will enable bhs before scheduling.
2580 extern int _cond_resched(void);
2582 #define cond_resched() ({ \
2583 __might_sleep(__FILE__, __LINE__, 0); \
2587 extern int __cond_resched_lock(spinlock_t
*lock
);
2589 #ifdef CONFIG_PREEMPT_COUNT
2590 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2592 #define PREEMPT_LOCK_OFFSET 0
2595 #define cond_resched_lock(lock) ({ \
2596 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2597 __cond_resched_lock(lock); \
2600 extern int __cond_resched_softirq(void);
2602 #define cond_resched_softirq() ({ \
2603 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2604 __cond_resched_softirq(); \
2607 static inline void cond_resched_rcu(void)
2609 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
2617 * Does a critical section need to be broken due to another
2618 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2619 * but a general need for low latency)
2621 static inline int spin_needbreak(spinlock_t
*lock
)
2623 #ifdef CONFIG_PREEMPT
2624 return spin_is_contended(lock
);
2631 * Idle thread specific functions to determine the need_resched
2632 * polling state. We have two versions, one based on TS_POLLING in
2633 * thread_info.status and one based on TIF_POLLING_NRFLAG in
2637 static inline int tsk_is_polling(struct task_struct
*p
)
2639 return task_thread_info(p
)->status
& TS_POLLING
;
2641 static inline void __current_set_polling(void)
2643 current_thread_info()->status
|= TS_POLLING
;
2646 static inline bool __must_check
current_set_polling_and_test(void)
2648 __current_set_polling();
2651 * Polling state must be visible before we test NEED_RESCHED,
2652 * paired by resched_task()
2656 return unlikely(tif_need_resched());
2659 static inline void __current_clr_polling(void)
2661 current_thread_info()->status
&= ~TS_POLLING
;
2664 static inline bool __must_check
current_clr_polling_and_test(void)
2666 __current_clr_polling();
2669 * Polling state must be visible before we test NEED_RESCHED,
2670 * paired by resched_task()
2674 return unlikely(tif_need_resched());
2676 #elif defined(TIF_POLLING_NRFLAG)
2677 static inline int tsk_is_polling(struct task_struct
*p
)
2679 return test_tsk_thread_flag(p
, TIF_POLLING_NRFLAG
);
2682 static inline void __current_set_polling(void)
2684 set_thread_flag(TIF_POLLING_NRFLAG
);
2687 static inline bool __must_check
current_set_polling_and_test(void)
2689 __current_set_polling();
2692 * Polling state must be visible before we test NEED_RESCHED,
2693 * paired by resched_task()
2695 * XXX: assumes set/clear bit are identical barrier wise.
2697 smp_mb__after_clear_bit();
2699 return unlikely(tif_need_resched());
2702 static inline void __current_clr_polling(void)
2704 clear_thread_flag(TIF_POLLING_NRFLAG
);
2707 static inline bool __must_check
current_clr_polling_and_test(void)
2709 __current_clr_polling();
2712 * Polling state must be visible before we test NEED_RESCHED,
2713 * paired by resched_task()
2715 smp_mb__after_clear_bit();
2717 return unlikely(tif_need_resched());
2721 static inline int tsk_is_polling(struct task_struct
*p
) { return 0; }
2722 static inline void __current_set_polling(void) { }
2723 static inline void __current_clr_polling(void) { }
2725 static inline bool __must_check
current_set_polling_and_test(void)
2727 return unlikely(tif_need_resched());
2729 static inline bool __must_check
current_clr_polling_and_test(void)
2731 return unlikely(tif_need_resched());
2735 static __always_inline
bool need_resched(void)
2737 return unlikely(tif_need_resched());
2741 * Thread group CPU time accounting.
2743 void thread_group_cputime(struct task_struct
*tsk
, struct task_cputime
*times
);
2744 void thread_group_cputimer(struct task_struct
*tsk
, struct task_cputime
*times
);
2746 static inline void thread_group_cputime_init(struct signal_struct
*sig
)
2748 raw_spin_lock_init(&sig
->cputimer
.lock
);
2752 * Reevaluate whether the task has signals pending delivery.
2753 * Wake the task if so.
2754 * This is required every time the blocked sigset_t changes.
2755 * callers must hold sighand->siglock.
2757 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
2758 extern void recalc_sigpending(void);
2760 extern void signal_wake_up_state(struct task_struct
*t
, unsigned int state
);
2762 static inline void signal_wake_up(struct task_struct
*t
, bool resume
)
2764 signal_wake_up_state(t
, resume
? TASK_WAKEKILL
: 0);
2766 static inline void ptrace_signal_wake_up(struct task_struct
*t
, bool resume
)
2768 signal_wake_up_state(t
, resume
? __TASK_TRACED
: 0);
2772 * Wrappers for p->thread_info->cpu access. No-op on UP.
2776 static inline unsigned int task_cpu(const struct task_struct
*p
)
2778 return task_thread_info(p
)->cpu
;
2781 static inline int task_node(const struct task_struct
*p
)
2783 return cpu_to_node(task_cpu(p
));
2786 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
2790 static inline unsigned int task_cpu(const struct task_struct
*p
)
2795 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
2799 #endif /* CONFIG_SMP */
2801 extern long sched_setaffinity(pid_t pid
, const struct cpumask
*new_mask
);
2802 extern long sched_getaffinity(pid_t pid
, struct cpumask
*mask
);
2804 #ifdef CONFIG_CGROUP_SCHED
2805 extern struct task_group root_task_group
;
2806 #endif /* CONFIG_CGROUP_SCHED */
2808 extern int task_can_switch_user(struct user_struct
*up
,
2809 struct task_struct
*tsk
);
2811 #ifdef CONFIG_TASK_XACCT
2812 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2814 tsk
->ioac
.rchar
+= amt
;
2817 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2819 tsk
->ioac
.wchar
+= amt
;
2822 static inline void inc_syscr(struct task_struct
*tsk
)
2827 static inline void inc_syscw(struct task_struct
*tsk
)
2832 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2836 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2840 static inline void inc_syscr(struct task_struct
*tsk
)
2844 static inline void inc_syscw(struct task_struct
*tsk
)
2849 #ifndef TASK_SIZE_OF
2850 #define TASK_SIZE_OF(tsk) TASK_SIZE
2853 #ifdef CONFIG_MM_OWNER
2854 extern void mm_update_next_owner(struct mm_struct
*mm
);
2855 extern void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
);
2857 static inline void mm_update_next_owner(struct mm_struct
*mm
)
2861 static inline void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
)
2864 #endif /* CONFIG_MM_OWNER */
2866 static inline unsigned long task_rlimit(const struct task_struct
*tsk
,
2869 return ACCESS_ONCE(tsk
->signal
->rlim
[limit
].rlim_cur
);
2872 static inline unsigned long task_rlimit_max(const struct task_struct
*tsk
,
2875 return ACCESS_ONCE(tsk
->signal
->rlim
[limit
].rlim_max
);
2878 static inline unsigned long rlimit(unsigned int limit
)
2880 return task_rlimit(current
, limit
);
2883 static inline unsigned long rlimit_max(unsigned int limit
)
2885 return task_rlimit_max(current
, limit
);