4 #include <uapi/linux/sched.h>
11 #include <asm/param.h> /* for HZ */
13 #include <linux/capability.h>
14 #include <linux/threads.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/timex.h>
18 #include <linux/jiffies.h>
19 #include <linux/rbtree.h>
20 #include <linux/thread_info.h>
21 #include <linux/cpumask.h>
22 #include <linux/errno.h>
23 #include <linux/nodemask.h>
24 #include <linux/mm_types.h>
27 #include <asm/ptrace.h>
28 #include <asm/cputime.h>
30 #include <linux/smp.h>
31 #include <linux/sem.h>
32 #include <linux/signal.h>
33 #include <linux/compiler.h>
34 #include <linux/completion.h>
35 #include <linux/pid.h>
36 #include <linux/percpu.h>
37 #include <linux/topology.h>
38 #include <linux/proportions.h>
39 #include <linux/seccomp.h>
40 #include <linux/rcupdate.h>
41 #include <linux/rculist.h>
42 #include <linux/rtmutex.h>
44 #include <linux/time.h>
45 #include <linux/param.h>
46 #include <linux/resource.h>
47 #include <linux/timer.h>
48 #include <linux/hrtimer.h>
49 #include <linux/task_io_accounting.h>
50 #include <linux/latencytop.h>
51 #include <linux/cred.h>
52 #include <linux/llist.h>
53 #include <linux/uidgid.h>
55 #include <asm/processor.h>
58 struct futex_pi_state
;
59 struct robust_list_head
;
62 struct perf_event_context
;
66 * List of flags we want to share for kernel threads,
67 * if only because they are not used by them anyway.
69 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
72 * These are the constant used to fake the fixed-point load-average
73 * counting. Some notes:
74 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
75 * a load-average precision of 10 bits integer + 11 bits fractional
76 * - if you want to count load-averages more often, you need more
77 * precision, or rounding will get you. With 2-second counting freq,
78 * the EXP_n values would be 1981, 2034 and 2043 if still using only
81 extern unsigned long avenrun
[]; /* Load averages */
82 extern void get_avenrun(unsigned long *loads
, unsigned long offset
, int shift
);
84 #define FSHIFT 11 /* nr of bits of precision */
85 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
86 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
87 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
88 #define EXP_5 2014 /* 1/exp(5sec/5min) */
89 #define EXP_15 2037 /* 1/exp(5sec/15min) */
91 #define CALC_LOAD(load,exp,n) \
93 load += n*(FIXED_1-exp); \
96 extern unsigned long total_forks
;
97 extern int nr_threads
;
98 DECLARE_PER_CPU(unsigned long, process_counts
);
99 extern int nr_processes(void);
100 extern unsigned long nr_running(void);
101 extern unsigned long nr_uninterruptible(void);
102 extern unsigned long nr_iowait(void);
103 extern unsigned long nr_iowait_cpu(int cpu
);
104 extern unsigned long this_cpu_load(void);
107 extern void calc_global_load(unsigned long ticks
);
108 extern void update_cpu_load_nohz(void);
110 extern unsigned long get_parent_ip(unsigned long addr
);
115 #ifdef CONFIG_SCHED_DEBUG
116 extern void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
);
117 extern void proc_sched_set_task(struct task_struct
*p
);
119 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
);
122 proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
125 static inline void proc_sched_set_task(struct task_struct
*p
)
129 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
135 * Task state bitmask. NOTE! These bits are also
136 * encoded in fs/proc/array.c: get_task_state().
138 * We have two separate sets of flags: task->state
139 * is about runnability, while task->exit_state are
140 * about the task exiting. Confusing, but this way
141 * modifying one set can't modify the other one by
144 #define TASK_RUNNING 0
145 #define TASK_INTERRUPTIBLE 1
146 #define TASK_UNINTERRUPTIBLE 2
147 #define __TASK_STOPPED 4
148 #define __TASK_TRACED 8
149 /* in tsk->exit_state */
150 #define EXIT_ZOMBIE 16
152 /* in tsk->state again */
154 #define TASK_WAKEKILL 128
155 #define TASK_WAKING 256
156 #define TASK_STATE_MAX 512
158 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
160 extern char ___assert_task_state
[1 - 2*!!(
161 sizeof(TASK_STATE_TO_CHAR_STR
)-1 != ilog2(TASK_STATE_MAX
)+1)];
163 /* Convenience macros for the sake of set_task_state */
164 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
165 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
166 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
168 /* Convenience macros for the sake of wake_up */
169 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
170 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
172 /* get_task_state() */
173 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
174 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
177 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
178 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
179 #define task_is_dead(task) ((task)->exit_state != 0)
180 #define task_is_stopped_or_traced(task) \
181 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
182 #define task_contributes_to_load(task) \
183 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
184 (task->flags & PF_FROZEN) == 0)
186 #define __set_task_state(tsk, state_value) \
187 do { (tsk)->state = (state_value); } while (0)
188 #define set_task_state(tsk, state_value) \
189 set_mb((tsk)->state, (state_value))
192 * set_current_state() includes a barrier so that the write of current->state
193 * is correctly serialised wrt the caller's subsequent test of whether to
196 * set_current_state(TASK_UNINTERRUPTIBLE);
197 * if (do_i_need_to_sleep())
200 * If the caller does not need such serialisation then use __set_current_state()
202 #define __set_current_state(state_value) \
203 do { current->state = (state_value); } while (0)
204 #define set_current_state(state_value) \
205 set_mb(current->state, (state_value))
207 /* Task command name length */
208 #define TASK_COMM_LEN 16
210 #include <linux/spinlock.h>
213 * This serializes "schedule()" and also protects
214 * the run-queue from deletions/modifications (but
215 * _adding_ to the beginning of the run-queue has
218 extern rwlock_t tasklist_lock
;
219 extern spinlock_t mmlist_lock
;
223 #ifdef CONFIG_PROVE_RCU
224 extern int lockdep_tasklist_lock_is_held(void);
225 #endif /* #ifdef CONFIG_PROVE_RCU */
227 extern void sched_init(void);
228 extern void sched_init_smp(void);
229 extern asmlinkage
void schedule_tail(struct task_struct
*prev
);
230 extern void init_idle(struct task_struct
*idle
, int cpu
);
231 extern void init_idle_bootup_task(struct task_struct
*idle
);
233 extern int runqueue_is_locked(int cpu
);
235 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
236 extern void nohz_balance_enter_idle(int cpu
);
237 extern void set_cpu_sd_state_idle(void);
238 extern int get_nohz_timer_target(void);
240 static inline void nohz_balance_enter_idle(int cpu
) { }
241 static inline void set_cpu_sd_state_idle(void) { }
245 * Only dump TASK_* tasks. (0 for all tasks)
247 extern void show_state_filter(unsigned long state_filter
);
249 static inline void show_state(void)
251 show_state_filter(0);
254 extern void show_regs(struct pt_regs
*);
257 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
258 * task), SP is the stack pointer of the first frame that should be shown in the back
259 * trace (or NULL if the entire call-chain of the task should be shown).
261 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
263 void io_schedule(void);
264 long io_schedule_timeout(long timeout
);
266 extern void cpu_init (void);
267 extern void trap_init(void);
268 extern void update_process_times(int user
);
269 extern void scheduler_tick(void);
271 extern void sched_show_task(struct task_struct
*p
);
273 #ifdef CONFIG_LOCKUP_DETECTOR
274 extern void touch_softlockup_watchdog(void);
275 extern void touch_softlockup_watchdog_sync(void);
276 extern void touch_all_softlockup_watchdogs(void);
277 extern int proc_dowatchdog_thresh(struct ctl_table
*table
, int write
,
279 size_t *lenp
, loff_t
*ppos
);
280 extern unsigned int softlockup_panic
;
281 void lockup_detector_init(void);
283 static inline void touch_softlockup_watchdog(void)
286 static inline void touch_softlockup_watchdog_sync(void)
289 static inline void touch_all_softlockup_watchdogs(void)
292 static inline void lockup_detector_init(void)
297 #ifdef CONFIG_DETECT_HUNG_TASK
298 extern unsigned int sysctl_hung_task_panic
;
299 extern unsigned long sysctl_hung_task_check_count
;
300 extern unsigned long sysctl_hung_task_timeout_secs
;
301 extern unsigned long sysctl_hung_task_warnings
;
302 extern int proc_dohung_task_timeout_secs(struct ctl_table
*table
, int write
,
304 size_t *lenp
, loff_t
*ppos
);
306 /* Avoid need for ifdefs elsewhere in the code */
307 enum { sysctl_hung_task_timeout_secs
= 0 };
310 /* Attach to any functions which should be ignored in wchan output. */
311 #define __sched __attribute__((__section__(".sched.text")))
313 /* Linker adds these: start and end of __sched functions */
314 extern char __sched_text_start
[], __sched_text_end
[];
316 /* Is this address in the __sched functions? */
317 extern int in_sched_functions(unsigned long addr
);
319 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
320 extern signed long schedule_timeout(signed long timeout
);
321 extern signed long schedule_timeout_interruptible(signed long timeout
);
322 extern signed long schedule_timeout_killable(signed long timeout
);
323 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
324 asmlinkage
void schedule(void);
325 extern void schedule_preempt_disabled(void);
326 extern int mutex_spin_on_owner(struct mutex
*lock
, struct task_struct
*owner
);
329 struct user_namespace
;
332 * Default maximum number of active map areas, this limits the number of vmas
333 * per mm struct. Users can overwrite this number by sysctl but there is a
336 * When a program's coredump is generated as ELF format, a section is created
337 * per a vma. In ELF, the number of sections is represented in unsigned short.
338 * This means the number of sections should be smaller than 65535 at coredump.
339 * Because the kernel adds some informative sections to a image of program at
340 * generating coredump, we need some margin. The number of extra sections is
341 * 1-3 now and depends on arch. We use "5" as safe margin, here.
343 #define MAPCOUNT_ELF_CORE_MARGIN (5)
344 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
346 extern int sysctl_max_map_count
;
348 #include <linux/aio.h>
351 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
353 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
354 unsigned long, unsigned long);
356 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
357 unsigned long len
, unsigned long pgoff
,
358 unsigned long flags
);
359 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
360 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
362 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
) {}
366 extern void set_dumpable(struct mm_struct
*mm
, int value
);
367 extern int get_dumpable(struct mm_struct
*mm
);
369 /* get/set_dumpable() values */
370 #define SUID_DUMPABLE_DISABLED 0
371 #define SUID_DUMPABLE_ENABLED 1
372 #define SUID_DUMPABLE_SAFE 2
376 #define MMF_DUMPABLE 0 /* core dump is permitted */
377 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
379 #define MMF_DUMPABLE_BITS 2
380 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
382 /* coredump filter bits */
383 #define MMF_DUMP_ANON_PRIVATE 2
384 #define MMF_DUMP_ANON_SHARED 3
385 #define MMF_DUMP_MAPPED_PRIVATE 4
386 #define MMF_DUMP_MAPPED_SHARED 5
387 #define MMF_DUMP_ELF_HEADERS 6
388 #define MMF_DUMP_HUGETLB_PRIVATE 7
389 #define MMF_DUMP_HUGETLB_SHARED 8
391 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
392 #define MMF_DUMP_FILTER_BITS 7
393 #define MMF_DUMP_FILTER_MASK \
394 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
395 #define MMF_DUMP_FILTER_DEFAULT \
396 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
397 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
399 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
400 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
402 # define MMF_DUMP_MASK_DEFAULT_ELF 0
404 /* leave room for more dump flags */
405 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
406 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
407 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
409 #define MMF_HAS_UPROBES 19 /* has uprobes */
410 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
412 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
414 struct sighand_struct
{
416 struct k_sigaction action
[_NSIG
];
418 wait_queue_head_t signalfd_wqh
;
421 struct pacct_struct
{
424 unsigned long ac_mem
;
425 cputime_t ac_utime
, ac_stime
;
426 unsigned long ac_minflt
, ac_majflt
;
437 * struct task_cputime - collected CPU time counts
438 * @utime: time spent in user mode, in &cputime_t units
439 * @stime: time spent in kernel mode, in &cputime_t units
440 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
442 * This structure groups together three kinds of CPU time that are
443 * tracked for threads and thread groups. Most things considering
444 * CPU time want to group these counts together and treat all three
445 * of them in parallel.
447 struct task_cputime
{
450 unsigned long long sum_exec_runtime
;
452 /* Alternate field names when used to cache expirations. */
453 #define prof_exp stime
454 #define virt_exp utime
455 #define sched_exp sum_exec_runtime
457 #define INIT_CPUTIME \
458 (struct task_cputime) { \
461 .sum_exec_runtime = 0, \
465 * Disable preemption until the scheduler is running.
466 * Reset by start_kernel()->sched_init()->init_idle().
468 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
469 * before the scheduler is active -- see should_resched().
471 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
474 * struct thread_group_cputimer - thread group interval timer counts
475 * @cputime: thread group interval timers.
476 * @running: non-zero when there are timers running and
477 * @cputime receives updates.
478 * @lock: lock for fields in this struct.
480 * This structure contains the version of task_cputime, above, that is
481 * used for thread group CPU timer calculations.
483 struct thread_group_cputimer
{
484 struct task_cputime cputime
;
489 #include <linux/rwsem.h>
493 * NOTE! "signal_struct" does not have its own
494 * locking, because a shared signal_struct always
495 * implies a shared sighand_struct, so locking
496 * sighand_struct is always a proper superset of
497 * the locking of signal_struct.
499 struct signal_struct
{
504 wait_queue_head_t wait_chldexit
; /* for wait4() */
506 /* current thread group signal load-balancing target: */
507 struct task_struct
*curr_target
;
509 /* shared signal handling: */
510 struct sigpending shared_pending
;
512 /* thread group exit support */
515 * - notify group_exit_task when ->count is equal to notify_count
516 * - everyone except group_exit_task is stopped during signal delivery
517 * of fatal signals, group_exit_task processes the signal.
520 struct task_struct
*group_exit_task
;
522 /* thread group stop support, overloads group_exit_code too */
523 int group_stop_count
;
524 unsigned int flags
; /* see SIGNAL_* flags below */
527 * PR_SET_CHILD_SUBREAPER marks a process, like a service
528 * manager, to re-parent orphan (double-forking) child processes
529 * to this process instead of 'init'. The service manager is
530 * able to receive SIGCHLD signals and is able to investigate
531 * the process until it calls wait(). All children of this
532 * process will inherit a flag if they should look for a
533 * child_subreaper process at exit.
535 unsigned int is_child_subreaper
:1;
536 unsigned int has_child_subreaper
:1;
538 /* POSIX.1b Interval Timers */
539 struct list_head posix_timers
;
541 /* ITIMER_REAL timer for the process */
542 struct hrtimer real_timer
;
543 struct pid
*leader_pid
;
544 ktime_t it_real_incr
;
547 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
548 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
549 * values are defined to 0 and 1 respectively
551 struct cpu_itimer it
[2];
554 * Thread group totals for process CPU timers.
555 * See thread_group_cputimer(), et al, for details.
557 struct thread_group_cputimer cputimer
;
559 /* Earliest-expiration cache. */
560 struct task_cputime cputime_expires
;
562 struct list_head cpu_timers
[3];
564 struct pid
*tty_old_pgrp
;
566 /* boolean value for session group leader */
569 struct tty_struct
*tty
; /* NULL if no tty */
571 #ifdef CONFIG_SCHED_AUTOGROUP
572 struct autogroup
*autogroup
;
575 * Cumulative resource counters for dead threads in the group,
576 * and for reaped dead child processes forked by this group.
577 * Live threads maintain their own counters and add to these
578 * in __exit_signal, except for the group leader.
580 cputime_t utime
, stime
, cutime
, cstime
;
583 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
584 cputime_t prev_utime
, prev_stime
;
586 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
587 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
588 unsigned long inblock
, oublock
, cinblock
, coublock
;
589 unsigned long maxrss
, cmaxrss
;
590 struct task_io_accounting ioac
;
593 * Cumulative ns of schedule CPU time fo dead threads in the
594 * group, not including a zombie group leader, (This only differs
595 * from jiffies_to_ns(utime + stime) if sched_clock uses something
596 * other than jiffies.)
598 unsigned long long sum_sched_runtime
;
601 * We don't bother to synchronize most readers of this at all,
602 * because there is no reader checking a limit that actually needs
603 * to get both rlim_cur and rlim_max atomically, and either one
604 * alone is a single word that can safely be read normally.
605 * getrlimit/setrlimit use task_lock(current->group_leader) to
606 * protect this instead of the siglock, because they really
607 * have no need to disable irqs.
609 struct rlimit rlim
[RLIM_NLIMITS
];
611 #ifdef CONFIG_BSD_PROCESS_ACCT
612 struct pacct_struct pacct
; /* per-process accounting information */
614 #ifdef CONFIG_TASKSTATS
615 struct taskstats
*stats
;
619 struct tty_audit_buf
*tty_audit_buf
;
621 #ifdef CONFIG_CGROUPS
623 * group_rwsem prevents new tasks from entering the threadgroup and
624 * member tasks from exiting,a more specifically, setting of
625 * PF_EXITING. fork and exit paths are protected with this rwsem
626 * using threadgroup_change_begin/end(). Users which require
627 * threadgroup to remain stable should use threadgroup_[un]lock()
628 * which also takes care of exec path. Currently, cgroup is the
631 struct rw_semaphore group_rwsem
;
634 oom_flags_t oom_flags
;
635 short oom_score_adj
; /* OOM kill score adjustment */
636 short oom_score_adj_min
; /* OOM kill score adjustment min value.
637 * Only settable by CAP_SYS_RESOURCE. */
639 struct mutex cred_guard_mutex
; /* guard against foreign influences on
640 * credential calculations
641 * (notably. ptrace) */
645 * Bits in flags field of signal_struct.
647 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
648 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
649 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
651 * Pending notifications to parent.
653 #define SIGNAL_CLD_STOPPED 0x00000010
654 #define SIGNAL_CLD_CONTINUED 0x00000020
655 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
657 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
659 /* If true, all threads except ->group_exit_task have pending SIGKILL */
660 static inline int signal_group_exit(const struct signal_struct
*sig
)
662 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
663 (sig
->group_exit_task
!= NULL
);
667 * Some day this will be a full-fledged user tracking system..
670 atomic_t __count
; /* reference count */
671 atomic_t processes
; /* How many processes does this user have? */
672 atomic_t files
; /* How many open files does this user have? */
673 atomic_t sigpending
; /* How many pending signals does this user have? */
674 #ifdef CONFIG_INOTIFY_USER
675 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
676 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
678 #ifdef CONFIG_FANOTIFY
679 atomic_t fanotify_listeners
;
682 atomic_long_t epoll_watches
; /* The number of file descriptors currently watched */
684 #ifdef CONFIG_POSIX_MQUEUE
685 /* protected by mq_lock */
686 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
688 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
691 struct key
*uid_keyring
; /* UID specific keyring */
692 struct key
*session_keyring
; /* UID's default session keyring */
695 /* Hash table maintenance information */
696 struct hlist_node uidhash_node
;
699 #ifdef CONFIG_PERF_EVENTS
700 atomic_long_t locked_vm
;
704 extern int uids_sysfs_init(void);
706 extern struct user_struct
*find_user(kuid_t
);
708 extern struct user_struct root_user
;
709 #define INIT_USER (&root_user)
712 struct backing_dev_info
;
713 struct reclaim_state
;
715 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
717 /* cumulative counters */
718 unsigned long pcount
; /* # of times run on this cpu */
719 unsigned long long run_delay
; /* time spent waiting on a runqueue */
722 unsigned long long last_arrival
,/* when we last ran on a cpu */
723 last_queued
; /* when we were last queued to run */
725 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
727 #ifdef CONFIG_TASK_DELAY_ACCT
728 struct task_delay_info
{
730 unsigned int flags
; /* Private per-task flags */
732 /* For each stat XXX, add following, aligned appropriately
734 * struct timespec XXX_start, XXX_end;
738 * Atomicity of updates to XXX_delay, XXX_count protected by
739 * single lock above (split into XXX_lock if contention is an issue).
743 * XXX_count is incremented on every XXX operation, the delay
744 * associated with the operation is added to XXX_delay.
745 * XXX_delay contains the accumulated delay time in nanoseconds.
747 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
748 u64 blkio_delay
; /* wait for sync block io completion */
749 u64 swapin_delay
; /* wait for swapin block io completion */
750 u32 blkio_count
; /* total count of the number of sync block */
751 /* io operations performed */
752 u32 swapin_count
; /* total count of the number of swapin block */
753 /* io operations performed */
755 struct timespec freepages_start
, freepages_end
;
756 u64 freepages_delay
; /* wait for memory reclaim */
757 u32 freepages_count
; /* total count of memory reclaim */
759 #endif /* CONFIG_TASK_DELAY_ACCT */
761 static inline int sched_info_on(void)
763 #ifdef CONFIG_SCHEDSTATS
765 #elif defined(CONFIG_TASK_DELAY_ACCT)
766 extern int delayacct_on
;
781 * Increase resolution of nice-level calculations for 64-bit architectures.
782 * The extra resolution improves shares distribution and load balancing of
783 * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
784 * hierarchies, especially on larger systems. This is not a user-visible change
785 * and does not change the user-interface for setting shares/weights.
787 * We increase resolution only if we have enough bits to allow this increased
788 * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
789 * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
792 #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */
793 # define SCHED_LOAD_RESOLUTION 10
794 # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION)
795 # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION)
797 # define SCHED_LOAD_RESOLUTION 0
798 # define scale_load(w) (w)
799 # define scale_load_down(w) (w)
802 #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION)
803 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
806 * Increase resolution of cpu_power calculations
808 #define SCHED_POWER_SHIFT 10
809 #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
812 * sched-domains (multiprocessor balancing) declarations:
815 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
816 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
817 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
818 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
819 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
820 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
821 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
822 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
823 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
824 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
825 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
826 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
828 extern int __weak
arch_sd_sibiling_asym_packing(void);
830 struct sched_group_power
{
833 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
836 unsigned int power
, power_orig
;
837 unsigned long next_update
;
839 * Number of busy cpus in this group.
841 atomic_t nr_busy_cpus
;
843 unsigned long cpumask
[0]; /* iteration mask */
847 struct sched_group
*next
; /* Must be a circular list */
850 unsigned int group_weight
;
851 struct sched_group_power
*sgp
;
854 * The CPUs this group covers.
856 * NOTE: this field is variable length. (Allocated dynamically
857 * by attaching extra space to the end of the structure,
858 * depending on how many CPUs the kernel has booted up with)
860 unsigned long cpumask
[0];
863 static inline struct cpumask
*sched_group_cpus(struct sched_group
*sg
)
865 return to_cpumask(sg
->cpumask
);
869 * cpumask masking which cpus in the group are allowed to iterate up the domain
872 static inline struct cpumask
*sched_group_mask(struct sched_group
*sg
)
874 return to_cpumask(sg
->sgp
->cpumask
);
878 * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
879 * @group: The group whose first cpu is to be returned.
881 static inline unsigned int group_first_cpu(struct sched_group
*group
)
883 return cpumask_first(sched_group_cpus(group
));
886 struct sched_domain_attr
{
887 int relax_domain_level
;
890 #define SD_ATTR_INIT (struct sched_domain_attr) { \
891 .relax_domain_level = -1, \
894 extern int sched_domain_level_max
;
896 struct sched_domain
{
897 /* These fields must be setup */
898 struct sched_domain
*parent
; /* top domain must be null terminated */
899 struct sched_domain
*child
; /* bottom domain must be null terminated */
900 struct sched_group
*groups
; /* the balancing groups of the domain */
901 unsigned long min_interval
; /* Minimum balance interval ms */
902 unsigned long max_interval
; /* Maximum balance interval ms */
903 unsigned int busy_factor
; /* less balancing by factor if busy */
904 unsigned int imbalance_pct
; /* No balance until over watermark */
905 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
906 unsigned int busy_idx
;
907 unsigned int idle_idx
;
908 unsigned int newidle_idx
;
909 unsigned int wake_idx
;
910 unsigned int forkexec_idx
;
911 unsigned int smt_gain
;
912 int flags
; /* See SD_* */
915 /* Runtime fields. */
916 unsigned long last_balance
; /* init to jiffies. units in jiffies */
917 unsigned int balance_interval
; /* initialise to 1. units in ms. */
918 unsigned int nr_balance_failed
; /* initialise to 0 */
922 #ifdef CONFIG_SCHEDSTATS
923 /* load_balance() stats */
924 unsigned int lb_count
[CPU_MAX_IDLE_TYPES
];
925 unsigned int lb_failed
[CPU_MAX_IDLE_TYPES
];
926 unsigned int lb_balanced
[CPU_MAX_IDLE_TYPES
];
927 unsigned int lb_imbalance
[CPU_MAX_IDLE_TYPES
];
928 unsigned int lb_gained
[CPU_MAX_IDLE_TYPES
];
929 unsigned int lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
930 unsigned int lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
931 unsigned int lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
933 /* Active load balancing */
934 unsigned int alb_count
;
935 unsigned int alb_failed
;
936 unsigned int alb_pushed
;
938 /* SD_BALANCE_EXEC stats */
939 unsigned int sbe_count
;
940 unsigned int sbe_balanced
;
941 unsigned int sbe_pushed
;
943 /* SD_BALANCE_FORK stats */
944 unsigned int sbf_count
;
945 unsigned int sbf_balanced
;
946 unsigned int sbf_pushed
;
948 /* try_to_wake_up() stats */
949 unsigned int ttwu_wake_remote
;
950 unsigned int ttwu_move_affine
;
951 unsigned int ttwu_move_balance
;
953 #ifdef CONFIG_SCHED_DEBUG
957 void *private; /* used during construction */
958 struct rcu_head rcu
; /* used during destruction */
961 unsigned int span_weight
;
963 * Span of all CPUs in this domain.
965 * NOTE: this field is variable length. (Allocated dynamically
966 * by attaching extra space to the end of the structure,
967 * depending on how many CPUs the kernel has booted up with)
969 unsigned long span
[0];
972 static inline struct cpumask
*sched_domain_span(struct sched_domain
*sd
)
974 return to_cpumask(sd
->span
);
977 extern void partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
978 struct sched_domain_attr
*dattr_new
);
980 /* Allocate an array of sched domains, for partition_sched_domains(). */
981 cpumask_var_t
*alloc_sched_domains(unsigned int ndoms
);
982 void free_sched_domains(cpumask_var_t doms
[], unsigned int ndoms
);
984 /* Test a flag in parent sched domain */
985 static inline int test_sd_parent(struct sched_domain
*sd
, int flag
)
987 if (sd
->parent
&& (sd
->parent
->flags
& flag
))
993 unsigned long default_scale_freq_power(struct sched_domain
*sd
, int cpu
);
994 unsigned long default_scale_smt_power(struct sched_domain
*sd
, int cpu
);
996 bool cpus_share_cache(int this_cpu
, int that_cpu
);
998 #else /* CONFIG_SMP */
1000 struct sched_domain_attr
;
1003 partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
1004 struct sched_domain_attr
*dattr_new
)
1008 static inline bool cpus_share_cache(int this_cpu
, int that_cpu
)
1013 #endif /* !CONFIG_SMP */
1016 struct io_context
; /* See blkdev.h */
1019 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1020 extern void prefetch_stack(struct task_struct
*t
);
1022 static inline void prefetch_stack(struct task_struct
*t
) { }
1025 struct audit_context
; /* See audit.c */
1027 struct pipe_inode_info
;
1028 struct uts_namespace
;
1031 struct sched_domain
;
1036 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
1037 #define WF_FORK 0x02 /* child wakeup after fork */
1038 #define WF_MIGRATED 0x04 /* internal use, task got migrated */
1040 #define ENQUEUE_WAKEUP 1
1041 #define ENQUEUE_HEAD 2
1043 #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */
1045 #define ENQUEUE_WAKING 0
1048 #define DEQUEUE_SLEEP 1
1050 struct sched_class
{
1051 const struct sched_class
*next
;
1053 void (*enqueue_task
) (struct rq
*rq
, struct task_struct
*p
, int flags
);
1054 void (*dequeue_task
) (struct rq
*rq
, struct task_struct
*p
, int flags
);
1055 void (*yield_task
) (struct rq
*rq
);
1056 bool (*yield_to_task
) (struct rq
*rq
, struct task_struct
*p
, bool preempt
);
1058 void (*check_preempt_curr
) (struct rq
*rq
, struct task_struct
*p
, int flags
);
1060 struct task_struct
* (*pick_next_task
) (struct rq
*rq
);
1061 void (*put_prev_task
) (struct rq
*rq
, struct task_struct
*p
);
1064 int (*select_task_rq
)(struct task_struct
*p
, int sd_flag
, int flags
);
1066 void (*pre_schedule
) (struct rq
*this_rq
, struct task_struct
*task
);
1067 void (*post_schedule
) (struct rq
*this_rq
);
1068 void (*task_waking
) (struct task_struct
*task
);
1069 void (*task_woken
) (struct rq
*this_rq
, struct task_struct
*task
);
1071 void (*set_cpus_allowed
)(struct task_struct
*p
,
1072 const struct cpumask
*newmask
);
1074 void (*rq_online
)(struct rq
*rq
);
1075 void (*rq_offline
)(struct rq
*rq
);
1078 void (*set_curr_task
) (struct rq
*rq
);
1079 void (*task_tick
) (struct rq
*rq
, struct task_struct
*p
, int queued
);
1080 void (*task_fork
) (struct task_struct
*p
);
1082 void (*switched_from
) (struct rq
*this_rq
, struct task_struct
*task
);
1083 void (*switched_to
) (struct rq
*this_rq
, struct task_struct
*task
);
1084 void (*prio_changed
) (struct rq
*this_rq
, struct task_struct
*task
,
1087 unsigned int (*get_rr_interval
) (struct rq
*rq
,
1088 struct task_struct
*task
);
1090 #ifdef CONFIG_FAIR_GROUP_SCHED
1091 void (*task_move_group
) (struct task_struct
*p
, int on_rq
);
1095 struct load_weight
{
1096 unsigned long weight
, inv_weight
;
1099 #ifdef CONFIG_SCHEDSTATS
1100 struct sched_statistics
{
1110 s64 sum_sleep_runtime
;
1117 u64 nr_migrations_cold
;
1118 u64 nr_failed_migrations_affine
;
1119 u64 nr_failed_migrations_running
;
1120 u64 nr_failed_migrations_hot
;
1121 u64 nr_forced_migrations
;
1124 u64 nr_wakeups_sync
;
1125 u64 nr_wakeups_migrate
;
1126 u64 nr_wakeups_local
;
1127 u64 nr_wakeups_remote
;
1128 u64 nr_wakeups_affine
;
1129 u64 nr_wakeups_affine_attempts
;
1130 u64 nr_wakeups_passive
;
1131 u64 nr_wakeups_idle
;
1135 struct sched_entity
{
1136 struct load_weight load
; /* for load-balancing */
1137 struct rb_node run_node
;
1138 struct list_head group_node
;
1142 u64 sum_exec_runtime
;
1144 u64 prev_sum_exec_runtime
;
1148 #ifdef CONFIG_SCHEDSTATS
1149 struct sched_statistics statistics
;
1152 #ifdef CONFIG_FAIR_GROUP_SCHED
1153 struct sched_entity
*parent
;
1154 /* rq on which this entity is (to be) queued: */
1155 struct cfs_rq
*cfs_rq
;
1156 /* rq "owned" by this entity/group: */
1157 struct cfs_rq
*my_q
;
1161 struct sched_rt_entity
{
1162 struct list_head run_list
;
1163 unsigned long timeout
;
1164 unsigned int time_slice
;
1166 struct sched_rt_entity
*back
;
1167 #ifdef CONFIG_RT_GROUP_SCHED
1168 struct sched_rt_entity
*parent
;
1169 /* rq on which this entity is (to be) queued: */
1170 struct rt_rq
*rt_rq
;
1171 /* rq "owned" by this entity/group: */
1177 * default timeslice is 100 msecs (used only for SCHED_RR tasks).
1178 * Timeslices get refilled after they expire.
1180 #define RR_TIMESLICE (100 * HZ / 1000)
1184 enum perf_event_task_context
{
1185 perf_invalid_context
= -1,
1186 perf_hw_context
= 0,
1188 perf_nr_task_contexts
,
1191 struct task_struct
{
1192 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
1195 unsigned int flags
; /* per process flags, defined below */
1196 unsigned int ptrace
;
1199 struct llist_node wake_entry
;
1204 int prio
, static_prio
, normal_prio
;
1205 unsigned int rt_priority
;
1206 const struct sched_class
*sched_class
;
1207 struct sched_entity se
;
1208 struct sched_rt_entity rt
;
1209 #ifdef CONFIG_CGROUP_SCHED
1210 struct task_group
*sched_task_group
;
1213 #ifdef CONFIG_PREEMPT_NOTIFIERS
1214 /* list of struct preempt_notifier: */
1215 struct hlist_head preempt_notifiers
;
1219 * fpu_counter contains the number of consecutive context switches
1220 * that the FPU is used. If this is over a threshold, the lazy fpu
1221 * saving becomes unlazy to save the trap. This is an unsigned char
1222 * so that after 256 times the counter wraps and the behavior turns
1223 * lazy again; this to deal with bursty apps that only use FPU for
1226 unsigned char fpu_counter
;
1227 #ifdef CONFIG_BLK_DEV_IO_TRACE
1228 unsigned int btrace_seq
;
1231 unsigned int policy
;
1232 int nr_cpus_allowed
;
1233 cpumask_t cpus_allowed
;
1235 #ifdef CONFIG_PREEMPT_RCU
1236 int rcu_read_lock_nesting
;
1237 char rcu_read_unlock_special
;
1238 struct list_head rcu_node_entry
;
1239 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1240 #ifdef CONFIG_TREE_PREEMPT_RCU
1241 struct rcu_node
*rcu_blocked_node
;
1242 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1243 #ifdef CONFIG_RCU_BOOST
1244 struct rt_mutex
*rcu_boost_mutex
;
1245 #endif /* #ifdef CONFIG_RCU_BOOST */
1247 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1248 struct sched_info sched_info
;
1251 struct list_head tasks
;
1253 struct plist_node pushable_tasks
;
1256 struct mm_struct
*mm
, *active_mm
;
1257 #ifdef CONFIG_COMPAT_BRK
1258 unsigned brk_randomized
:1;
1260 #if defined(SPLIT_RSS_COUNTING)
1261 struct task_rss_stat rss_stat
;
1265 int exit_code
, exit_signal
;
1266 int pdeath_signal
; /* The signal sent when the parent dies */
1267 unsigned int jobctl
; /* JOBCTL_*, siglock protected */
1269 unsigned int personality
;
1270 unsigned did_exec
:1;
1271 unsigned in_execve
:1; /* Tell the LSMs that the process is doing an
1273 unsigned in_iowait
:1;
1275 /* task may not gain privileges */
1276 unsigned no_new_privs
:1;
1278 /* Revert to default priority/policy when forking */
1279 unsigned sched_reset_on_fork
:1;
1280 unsigned sched_contributes_to_load
:1;
1285 #ifdef CONFIG_CC_STACKPROTECTOR
1286 /* Canary value for the -fstack-protector gcc feature */
1287 unsigned long stack_canary
;
1290 * pointers to (original) parent process, youngest child, younger sibling,
1291 * older sibling, respectively. (p->father can be replaced with
1292 * p->real_parent->pid)
1294 struct task_struct __rcu
*real_parent
; /* real parent process */
1295 struct task_struct __rcu
*parent
; /* recipient of SIGCHLD, wait4() reports */
1297 * children/sibling forms the list of my natural children
1299 struct list_head children
; /* list of my children */
1300 struct list_head sibling
; /* linkage in my parent's children list */
1301 struct task_struct
*group_leader
; /* threadgroup leader */
1304 * ptraced is the list of tasks this task is using ptrace on.
1305 * This includes both natural children and PTRACE_ATTACH targets.
1306 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1308 struct list_head ptraced
;
1309 struct list_head ptrace_entry
;
1311 /* PID/PID hash table linkage. */
1312 struct pid_link pids
[PIDTYPE_MAX
];
1313 struct list_head thread_group
;
1315 struct completion
*vfork_done
; /* for vfork() */
1316 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
1317 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
1319 cputime_t utime
, stime
, utimescaled
, stimescaled
;
1321 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
1322 cputime_t prev_utime
, prev_stime
;
1324 unsigned long nvcsw
, nivcsw
; /* context switch counts */
1325 struct timespec start_time
; /* monotonic time */
1326 struct timespec real_start_time
; /* boot based time */
1327 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1328 unsigned long min_flt
, maj_flt
;
1330 struct task_cputime cputime_expires
;
1331 struct list_head cpu_timers
[3];
1333 /* process credentials */
1334 const struct cred __rcu
*real_cred
; /* objective and real subjective task
1335 * credentials (COW) */
1336 const struct cred __rcu
*cred
; /* effective (overridable) subjective task
1337 * credentials (COW) */
1338 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
1339 - access with [gs]et_task_comm (which lock
1340 it with task_lock())
1341 - initialized normally by setup_new_exec */
1342 /* file system info */
1343 int link_count
, total_link_count
;
1344 #ifdef CONFIG_SYSVIPC
1346 struct sysv_sem sysvsem
;
1348 #ifdef CONFIG_DETECT_HUNG_TASK
1349 /* hung task detection */
1350 unsigned long last_switch_count
;
1352 /* CPU-specific state of this task */
1353 struct thread_struct thread
;
1354 /* filesystem information */
1355 struct fs_struct
*fs
;
1356 /* open file information */
1357 struct files_struct
*files
;
1359 struct nsproxy
*nsproxy
;
1360 /* signal handlers */
1361 struct signal_struct
*signal
;
1362 struct sighand_struct
*sighand
;
1364 sigset_t blocked
, real_blocked
;
1365 sigset_t saved_sigmask
; /* restored if set_restore_sigmask() was used */
1366 struct sigpending pending
;
1368 unsigned long sas_ss_sp
;
1370 int (*notifier
)(void *priv
);
1371 void *notifier_data
;
1372 sigset_t
*notifier_mask
;
1373 struct callback_head
*task_works
;
1375 struct audit_context
*audit_context
;
1376 #ifdef CONFIG_AUDITSYSCALL
1378 unsigned int sessionid
;
1380 struct seccomp seccomp
;
1382 /* Thread group tracking */
1385 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1387 spinlock_t alloc_lock
;
1389 /* Protection of the PI data structures: */
1390 raw_spinlock_t pi_lock
;
1392 #ifdef CONFIG_RT_MUTEXES
1393 /* PI waiters blocked on a rt_mutex held by this task */
1394 struct plist_head pi_waiters
;
1395 /* Deadlock detection and priority inheritance handling */
1396 struct rt_mutex_waiter
*pi_blocked_on
;
1399 #ifdef CONFIG_DEBUG_MUTEXES
1400 /* mutex deadlock detection */
1401 struct mutex_waiter
*blocked_on
;
1403 #ifdef CONFIG_TRACE_IRQFLAGS
1404 unsigned int irq_events
;
1405 unsigned long hardirq_enable_ip
;
1406 unsigned long hardirq_disable_ip
;
1407 unsigned int hardirq_enable_event
;
1408 unsigned int hardirq_disable_event
;
1409 int hardirqs_enabled
;
1410 int hardirq_context
;
1411 unsigned long softirq_disable_ip
;
1412 unsigned long softirq_enable_ip
;
1413 unsigned int softirq_disable_event
;
1414 unsigned int softirq_enable_event
;
1415 int softirqs_enabled
;
1416 int softirq_context
;
1418 #ifdef CONFIG_LOCKDEP
1419 # define MAX_LOCK_DEPTH 48UL
1422 unsigned int lockdep_recursion
;
1423 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1424 gfp_t lockdep_reclaim_gfp
;
1427 /* journalling filesystem info */
1430 /* stacked block device info */
1431 struct bio_list
*bio_list
;
1434 /* stack plugging */
1435 struct blk_plug
*plug
;
1439 struct reclaim_state
*reclaim_state
;
1441 struct backing_dev_info
*backing_dev_info
;
1443 struct io_context
*io_context
;
1445 unsigned long ptrace_message
;
1446 siginfo_t
*last_siginfo
; /* For ptrace use. */
1447 struct task_io_accounting ioac
;
1448 #if defined(CONFIG_TASK_XACCT)
1449 u64 acct_rss_mem1
; /* accumulated rss usage */
1450 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1451 cputime_t acct_timexpd
; /* stime + utime since last update */
1453 #ifdef CONFIG_CPUSETS
1454 nodemask_t mems_allowed
; /* Protected by alloc_lock */
1455 seqcount_t mems_allowed_seq
; /* Seqence no to catch updates */
1456 int cpuset_mem_spread_rotor
;
1457 int cpuset_slab_spread_rotor
;
1459 #ifdef CONFIG_CGROUPS
1460 /* Control Group info protected by css_set_lock */
1461 struct css_set __rcu
*cgroups
;
1462 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1463 struct list_head cg_list
;
1466 struct robust_list_head __user
*robust_list
;
1467 #ifdef CONFIG_COMPAT
1468 struct compat_robust_list_head __user
*compat_robust_list
;
1470 struct list_head pi_state_list
;
1471 struct futex_pi_state
*pi_state_cache
;
1473 #ifdef CONFIG_PERF_EVENTS
1474 struct perf_event_context
*perf_event_ctxp
[perf_nr_task_contexts
];
1475 struct mutex perf_event_mutex
;
1476 struct list_head perf_event_list
;
1479 struct mempolicy
*mempolicy
; /* Protected by alloc_lock */
1481 short pref_node_fork
;
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 */
1546 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1547 atomic_t ptrace_bp_refcnt
;
1549 #ifdef CONFIG_UPROBES
1550 struct uprobe_task
*utask
;
1554 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1555 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1558 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1559 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1560 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1561 * values are inverted: lower p->prio value means higher priority.
1563 * The MAX_USER_RT_PRIO value allows the actual maximum
1564 * RT priority to be separate from the value exported to
1565 * user-space. This allows kernel threads to set their
1566 * priority to a value higher than any user task. Note:
1567 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1570 #define MAX_USER_RT_PRIO 100
1571 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1573 #define MAX_PRIO (MAX_RT_PRIO + 40)
1574 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1576 static inline int rt_prio(int prio
)
1578 if (unlikely(prio
< MAX_RT_PRIO
))
1583 static inline int rt_task(struct task_struct
*p
)
1585 return rt_prio(p
->prio
);
1588 static inline struct pid
*task_pid(struct task_struct
*task
)
1590 return task
->pids
[PIDTYPE_PID
].pid
;
1593 static inline struct pid
*task_tgid(struct task_struct
*task
)
1595 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1599 * Without tasklist or rcu lock it is not safe to dereference
1600 * the result of task_pgrp/task_session even if task == current,
1601 * we can race with another thread doing sys_setsid/sys_setpgid.
1603 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1605 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1608 static inline struct pid
*task_session(struct task_struct
*task
)
1610 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1613 struct pid_namespace
;
1616 * the helpers to get the task's different pids as they are seen
1617 * from various namespaces
1619 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1620 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1622 * task_xid_nr_ns() : id seen from the ns specified;
1624 * set_task_vxid() : assigns a virtual id to a task;
1626 * see also pid_nr() etc in include/linux/pid.h
1628 pid_t
__task_pid_nr_ns(struct task_struct
*task
, enum pid_type type
,
1629 struct pid_namespace
*ns
);
1631 static inline pid_t
task_pid_nr(struct task_struct
*tsk
)
1636 static inline pid_t
task_pid_nr_ns(struct task_struct
*tsk
,
1637 struct pid_namespace
*ns
)
1639 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, ns
);
1642 static inline pid_t
task_pid_vnr(struct task_struct
*tsk
)
1644 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, NULL
);
1648 static inline pid_t
task_tgid_nr(struct task_struct
*tsk
)
1653 pid_t
task_tgid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1655 static inline pid_t
task_tgid_vnr(struct task_struct
*tsk
)
1657 return pid_vnr(task_tgid(tsk
));
1661 static inline pid_t
task_pgrp_nr_ns(struct task_struct
*tsk
,
1662 struct pid_namespace
*ns
)
1664 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, ns
);
1667 static inline pid_t
task_pgrp_vnr(struct task_struct
*tsk
)
1669 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, NULL
);
1673 static inline pid_t
task_session_nr_ns(struct task_struct
*tsk
,
1674 struct pid_namespace
*ns
)
1676 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, ns
);
1679 static inline pid_t
task_session_vnr(struct task_struct
*tsk
)
1681 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, NULL
);
1684 /* obsolete, do not use */
1685 static inline pid_t
task_pgrp_nr(struct task_struct
*tsk
)
1687 return task_pgrp_nr_ns(tsk
, &init_pid_ns
);
1691 * pid_alive - check that a task structure is not stale
1692 * @p: Task structure to be checked.
1694 * Test if a process is not yet dead (at most zombie state)
1695 * If pid_alive fails, then pointers within the task structure
1696 * can be stale and must not be dereferenced.
1698 static inline int pid_alive(struct task_struct
*p
)
1700 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1704 * is_global_init - check if a task structure is init
1705 * @tsk: Task structure to be checked.
1707 * Check if a task structure is the first user space task the kernel created.
1709 static inline int is_global_init(struct task_struct
*tsk
)
1711 return tsk
->pid
== 1;
1715 * is_container_init:
1716 * check whether in the task is init in its own pid namespace.
1718 extern int is_container_init(struct task_struct
*tsk
);
1720 extern struct pid
*cad_pid
;
1722 extern void free_task(struct task_struct
*tsk
);
1723 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1725 extern void __put_task_struct(struct task_struct
*t
);
1727 static inline void put_task_struct(struct task_struct
*t
)
1729 if (atomic_dec_and_test(&t
->usage
))
1730 __put_task_struct(t
);
1733 extern void task_times(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
1734 extern void thread_group_times(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
1739 #define PF_EXITING 0x00000004 /* getting shut down */
1740 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1741 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1742 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1743 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1744 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1745 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1746 #define PF_DUMPCORE 0x00000200 /* dumped core */
1747 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1748 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1749 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1750 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1751 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1752 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1753 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1754 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1755 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1756 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1757 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1758 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1759 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1760 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1761 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1762 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1763 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1764 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1765 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1768 * Only the _current_ task can read/write to tsk->flags, but other
1769 * tasks can access tsk->flags in readonly mode for example
1770 * with tsk_used_math (like during threaded core dumping).
1771 * There is however an exception to this rule during ptrace
1772 * or during fork: the ptracer task is allowed to write to the
1773 * child->flags of its traced child (same goes for fork, the parent
1774 * can write to the child->flags), because we're guaranteed the
1775 * child is not running and in turn not changing child->flags
1776 * at the same time the parent does it.
1778 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1779 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1780 #define clear_used_math() clear_stopped_child_used_math(current)
1781 #define set_used_math() set_stopped_child_used_math(current)
1782 #define conditional_stopped_child_used_math(condition, child) \
1783 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1784 #define conditional_used_math(condition) \
1785 conditional_stopped_child_used_math(condition, current)
1786 #define copy_to_stopped_child_used_math(child) \
1787 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1788 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1789 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1790 #define used_math() tsk_used_math(current)
1793 * task->jobctl flags
1795 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1797 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1798 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1799 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1800 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1801 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1802 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1803 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1805 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1806 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
1807 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
1808 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
1809 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
1810 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
1811 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
1813 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1814 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
1816 extern bool task_set_jobctl_pending(struct task_struct
*task
,
1818 extern void task_clear_jobctl_trapping(struct task_struct
*task
);
1819 extern void task_clear_jobctl_pending(struct task_struct
*task
,
1822 #ifdef CONFIG_PREEMPT_RCU
1824 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1825 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1827 static inline void rcu_copy_process(struct task_struct
*p
)
1829 p
->rcu_read_lock_nesting
= 0;
1830 p
->rcu_read_unlock_special
= 0;
1831 #ifdef CONFIG_TREE_PREEMPT_RCU
1832 p
->rcu_blocked_node
= NULL
;
1833 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1834 #ifdef CONFIG_RCU_BOOST
1835 p
->rcu_boost_mutex
= NULL
;
1836 #endif /* #ifdef CONFIG_RCU_BOOST */
1837 INIT_LIST_HEAD(&p
->rcu_node_entry
);
1842 static inline void rcu_copy_process(struct task_struct
*p
)
1848 static inline void rcu_switch(struct task_struct
*prev
,
1849 struct task_struct
*next
)
1851 #ifdef CONFIG_RCU_USER_QS
1852 rcu_user_hooks_switch(prev
, next
);
1856 static inline void tsk_restore_flags(struct task_struct
*task
,
1857 unsigned long orig_flags
, unsigned long flags
)
1859 task
->flags
&= ~flags
;
1860 task
->flags
|= orig_flags
& flags
;
1864 extern void do_set_cpus_allowed(struct task_struct
*p
,
1865 const struct cpumask
*new_mask
);
1867 extern int set_cpus_allowed_ptr(struct task_struct
*p
,
1868 const struct cpumask
*new_mask
);
1870 static inline void do_set_cpus_allowed(struct task_struct
*p
,
1871 const struct cpumask
*new_mask
)
1874 static inline int set_cpus_allowed_ptr(struct task_struct
*p
,
1875 const struct cpumask
*new_mask
)
1877 if (!cpumask_test_cpu(0, new_mask
))
1884 void calc_load_enter_idle(void);
1885 void calc_load_exit_idle(void);
1887 static inline void calc_load_enter_idle(void) { }
1888 static inline void calc_load_exit_idle(void) { }
1889 #endif /* CONFIG_NO_HZ */
1891 #ifndef CONFIG_CPUMASK_OFFSTACK
1892 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1894 return set_cpus_allowed_ptr(p
, &new_mask
);
1899 * Do not use outside of architecture code which knows its limitations.
1901 * sched_clock() has no promise of monotonicity or bounded drift between
1902 * CPUs, use (which you should not) requires disabling IRQs.
1904 * Please use one of the three interfaces below.
1906 extern unsigned long long notrace
sched_clock(void);
1908 * See the comment in kernel/sched/clock.c
1910 extern u64
cpu_clock(int cpu
);
1911 extern u64
local_clock(void);
1912 extern u64
sched_clock_cpu(int cpu
);
1915 extern void sched_clock_init(void);
1917 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1918 static inline void sched_clock_tick(void)
1922 static inline void sched_clock_idle_sleep_event(void)
1926 static inline void sched_clock_idle_wakeup_event(u64 delta_ns
)
1931 * Architectures can set this to 1 if they have specified
1932 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1933 * but then during bootup it turns out that sched_clock()
1934 * is reliable after all:
1936 extern int sched_clock_stable
;
1938 extern void sched_clock_tick(void);
1939 extern void sched_clock_idle_sleep_event(void);
1940 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1943 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1945 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1946 * The reason for this explicit opt-in is not to have perf penalty with
1947 * slow sched_clocks.
1949 extern void enable_sched_clock_irqtime(void);
1950 extern void disable_sched_clock_irqtime(void);
1952 static inline void enable_sched_clock_irqtime(void) {}
1953 static inline void disable_sched_clock_irqtime(void) {}
1956 extern unsigned long long
1957 task_sched_runtime(struct task_struct
*task
);
1959 /* sched_exec is called by processes performing an exec */
1961 extern void sched_exec(void);
1963 #define sched_exec() {}
1966 extern void sched_clock_idle_sleep_event(void);
1967 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1969 #ifdef CONFIG_HOTPLUG_CPU
1970 extern void idle_task_exit(void);
1972 static inline void idle_task_exit(void) {}
1975 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1976 extern void wake_up_idle_cpu(int cpu
);
1978 static inline void wake_up_idle_cpu(int cpu
) { }
1981 extern unsigned int sysctl_sched_latency
;
1982 extern unsigned int sysctl_sched_min_granularity
;
1983 extern unsigned int sysctl_sched_wakeup_granularity
;
1984 extern unsigned int sysctl_sched_child_runs_first
;
1986 enum sched_tunable_scaling
{
1987 SCHED_TUNABLESCALING_NONE
,
1988 SCHED_TUNABLESCALING_LOG
,
1989 SCHED_TUNABLESCALING_LINEAR
,
1990 SCHED_TUNABLESCALING_END
,
1992 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling
;
1994 #ifdef CONFIG_SCHED_DEBUG
1995 extern unsigned int sysctl_sched_migration_cost
;
1996 extern unsigned int sysctl_sched_nr_migrate
;
1997 extern unsigned int sysctl_sched_time_avg
;
1998 extern unsigned int sysctl_timer_migration
;
1999 extern unsigned int sysctl_sched_shares_window
;
2001 int sched_proc_update_handler(struct ctl_table
*table
, int write
,
2002 void __user
*buffer
, size_t *length
,
2005 #ifdef CONFIG_SCHED_DEBUG
2006 static inline unsigned int get_sysctl_timer_migration(void)
2008 return sysctl_timer_migration
;
2011 static inline unsigned int get_sysctl_timer_migration(void)
2016 extern unsigned int sysctl_sched_rt_period
;
2017 extern int sysctl_sched_rt_runtime
;
2019 int sched_rt_handler(struct ctl_table
*table
, int write
,
2020 void __user
*buffer
, size_t *lenp
,
2023 #ifdef CONFIG_SCHED_AUTOGROUP
2024 extern unsigned int sysctl_sched_autogroup_enabled
;
2026 extern void sched_autogroup_create_attach(struct task_struct
*p
);
2027 extern void sched_autogroup_detach(struct task_struct
*p
);
2028 extern void sched_autogroup_fork(struct signal_struct
*sig
);
2029 extern void sched_autogroup_exit(struct signal_struct
*sig
);
2030 #ifdef CONFIG_PROC_FS
2031 extern void proc_sched_autogroup_show_task(struct task_struct
*p
, struct seq_file
*m
);
2032 extern int proc_sched_autogroup_set_nice(struct task_struct
*p
, int nice
);
2035 static inline void sched_autogroup_create_attach(struct task_struct
*p
) { }
2036 static inline void sched_autogroup_detach(struct task_struct
*p
) { }
2037 static inline void sched_autogroup_fork(struct signal_struct
*sig
) { }
2038 static inline void sched_autogroup_exit(struct signal_struct
*sig
) { }
2041 #ifdef CONFIG_CFS_BANDWIDTH
2042 extern unsigned int sysctl_sched_cfs_bandwidth_slice
;
2045 #ifdef CONFIG_RT_MUTEXES
2046 extern int rt_mutex_getprio(struct task_struct
*p
);
2047 extern void rt_mutex_setprio(struct task_struct
*p
, int prio
);
2048 extern void rt_mutex_adjust_pi(struct task_struct
*p
);
2049 static inline bool tsk_is_pi_blocked(struct task_struct
*tsk
)
2051 return tsk
->pi_blocked_on
!= NULL
;
2054 static inline int rt_mutex_getprio(struct task_struct
*p
)
2056 return p
->normal_prio
;
2058 # define rt_mutex_adjust_pi(p) do { } while (0)
2059 static inline bool tsk_is_pi_blocked(struct task_struct
*tsk
)
2065 extern bool yield_to(struct task_struct
*p
, bool preempt
);
2066 extern void set_user_nice(struct task_struct
*p
, long nice
);
2067 extern int task_prio(const struct task_struct
*p
);
2068 extern int task_nice(const struct task_struct
*p
);
2069 extern int can_nice(const struct task_struct
*p
, const int nice
);
2070 extern int task_curr(const struct task_struct
*p
);
2071 extern int idle_cpu(int cpu
);
2072 extern int sched_setscheduler(struct task_struct
*, int,
2073 const struct sched_param
*);
2074 extern int sched_setscheduler_nocheck(struct task_struct
*, int,
2075 const struct sched_param
*);
2076 extern struct task_struct
*idle_task(int cpu
);
2078 * is_idle_task - is the specified task an idle task?
2079 * @p: the task in question.
2081 static inline bool is_idle_task(const struct task_struct
*p
)
2085 extern struct task_struct
*curr_task(int cpu
);
2086 extern void set_curr_task(int cpu
, struct task_struct
*p
);
2091 * The default (Linux) execution domain.
2093 extern struct exec_domain default_exec_domain
;
2095 union thread_union
{
2096 struct thread_info thread_info
;
2097 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
2100 #ifndef __HAVE_ARCH_KSTACK_END
2101 static inline int kstack_end(void *addr
)
2103 /* Reliable end of stack detection:
2104 * Some APM bios versions misalign the stack
2106 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
2110 extern union thread_union init_thread_union
;
2111 extern struct task_struct init_task
;
2113 extern struct mm_struct init_mm
;
2115 extern struct pid_namespace init_pid_ns
;
2118 * find a task by one of its numerical ids
2120 * find_task_by_pid_ns():
2121 * finds a task by its pid in the specified namespace
2122 * find_task_by_vpid():
2123 * finds a task by its virtual pid
2125 * see also find_vpid() etc in include/linux/pid.h
2128 extern struct task_struct
*find_task_by_vpid(pid_t nr
);
2129 extern struct task_struct
*find_task_by_pid_ns(pid_t nr
,
2130 struct pid_namespace
*ns
);
2132 extern void __set_special_pids(struct pid
*pid
);
2134 /* per-UID process charging. */
2135 extern struct user_struct
* alloc_uid(kuid_t
);
2136 static inline struct user_struct
*get_uid(struct user_struct
*u
)
2138 atomic_inc(&u
->__count
);
2141 extern void free_uid(struct user_struct
*);
2143 #include <asm/current.h>
2145 extern void xtime_update(unsigned long ticks
);
2147 extern int wake_up_state(struct task_struct
*tsk
, unsigned int state
);
2148 extern int wake_up_process(struct task_struct
*tsk
);
2149 extern void wake_up_new_task(struct task_struct
*tsk
);
2151 extern void kick_process(struct task_struct
*tsk
);
2153 static inline void kick_process(struct task_struct
*tsk
) { }
2155 extern void sched_fork(struct task_struct
*p
);
2156 extern void sched_dead(struct task_struct
*p
);
2158 extern void proc_caches_init(void);
2159 extern void flush_signals(struct task_struct
*);
2160 extern void __flush_signals(struct task_struct
*);
2161 extern void ignore_signals(struct task_struct
*);
2162 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
2163 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
2165 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
2167 unsigned long flags
;
2170 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
2171 ret
= dequeue_signal(tsk
, mask
, info
);
2172 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
2177 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
2179 extern void unblock_all_signals(void);
2180 extern void release_task(struct task_struct
* p
);
2181 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
2182 extern int force_sigsegv(int, struct task_struct
*);
2183 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
2184 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
2185 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
2186 extern int kill_pid_info_as_cred(int, struct siginfo
*, struct pid
*,
2187 const struct cred
*, u32
);
2188 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
2189 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
2190 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
2191 extern __must_check
bool do_notify_parent(struct task_struct
*, int);
2192 extern void __wake_up_parent(struct task_struct
*p
, struct task_struct
*parent
);
2193 extern void force_sig(int, struct task_struct
*);
2194 extern int send_sig(int, struct task_struct
*, int);
2195 extern int zap_other_threads(struct task_struct
*p
);
2196 extern struct sigqueue
*sigqueue_alloc(void);
2197 extern void sigqueue_free(struct sigqueue
*);
2198 extern int send_sigqueue(struct sigqueue
*, struct task_struct
*, int group
);
2199 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
2200 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
2202 static inline void restore_saved_sigmask(void)
2204 if (test_and_clear_restore_sigmask())
2205 __set_current_blocked(¤t
->saved_sigmask
);
2208 static inline sigset_t
*sigmask_to_save(void)
2210 sigset_t
*res
= ¤t
->blocked
;
2211 if (unlikely(test_restore_sigmask()))
2212 res
= ¤t
->saved_sigmask
;
2216 static inline int kill_cad_pid(int sig
, int priv
)
2218 return kill_pid(cad_pid
, sig
, priv
);
2221 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2222 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2223 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2224 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2227 * True if we are on the alternate signal stack.
2229 static inline int on_sig_stack(unsigned long sp
)
2231 #ifdef CONFIG_STACK_GROWSUP
2232 return sp
>= current
->sas_ss_sp
&&
2233 sp
- current
->sas_ss_sp
< current
->sas_ss_size
;
2235 return sp
> current
->sas_ss_sp
&&
2236 sp
- current
->sas_ss_sp
<= current
->sas_ss_size
;
2240 static inline int sas_ss_flags(unsigned long sp
)
2242 return (current
->sas_ss_size
== 0 ? SS_DISABLE
2243 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
2247 * Routines for handling mm_structs
2249 extern struct mm_struct
* mm_alloc(void);
2251 /* mmdrop drops the mm and the page tables */
2252 extern void __mmdrop(struct mm_struct
*);
2253 static inline void mmdrop(struct mm_struct
* mm
)
2255 if (unlikely(atomic_dec_and_test(&mm
->mm_count
)))
2259 /* mmput gets rid of the mappings and all user-space */
2260 extern void mmput(struct mm_struct
*);
2261 /* Grab a reference to a task's mm, if it is not already going away */
2262 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
2264 * Grab a reference to a task's mm, if it is not already going away
2265 * and ptrace_may_access with the mode parameter passed to it
2268 extern struct mm_struct
*mm_access(struct task_struct
*task
, unsigned int mode
);
2269 /* Remove the current tasks stale references to the old mm_struct */
2270 extern void mm_release(struct task_struct
*, struct mm_struct
*);
2271 /* Allocate a new mm structure and copy contents from tsk->mm */
2272 extern struct mm_struct
*dup_mm(struct task_struct
*tsk
);
2274 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2275 struct task_struct
*, struct pt_regs
*);
2276 extern void flush_thread(void);
2277 extern void exit_thread(void);
2279 extern void exit_files(struct task_struct
*);
2280 extern void __cleanup_sighand(struct sighand_struct
*);
2282 extern void exit_itimers(struct signal_struct
*);
2283 extern void flush_itimer_signals(void);
2285 extern void do_group_exit(int);
2287 extern void daemonize(const char *, ...);
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
*, struct pt_regs
*);
2294 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
2295 struct task_struct
*fork_idle(int);
2296 #ifdef CONFIG_GENERIC_KERNEL_THREAD
2297 extern pid_t
kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
);
2300 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
2301 extern char *get_task_comm(char *to
, struct task_struct
*tsk
);
2304 void scheduler_ipi(void);
2305 extern unsigned long wait_task_inactive(struct task_struct
*, long match_state
);
2307 static inline void scheduler_ipi(void) { }
2308 static inline unsigned long wait_task_inactive(struct task_struct
*p
,
2315 #define next_task(p) \
2316 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2318 #define for_each_process(p) \
2319 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2321 extern bool current_is_single_threaded(void);
2324 * Careful: do_each_thread/while_each_thread is a double loop so
2325 * 'break' will not work as expected - use goto instead.
2327 #define do_each_thread(g, t) \
2328 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2330 #define while_each_thread(g, t) \
2331 while ((t = next_thread(t)) != g)
2333 static inline int get_nr_threads(struct task_struct
*tsk
)
2335 return tsk
->signal
->nr_threads
;
2338 static inline bool thread_group_leader(struct task_struct
*p
)
2340 return p
->exit_signal
>= 0;
2343 /* Do to the insanities of de_thread it is possible for a process
2344 * to have the pid of the thread group leader without actually being
2345 * the thread group leader. For iteration through the pids in proc
2346 * all we care about is that we have a task with the appropriate
2347 * pid, we don't actually care if we have the right task.
2349 static inline int has_group_leader_pid(struct task_struct
*p
)
2351 return p
->pid
== p
->tgid
;
2355 int same_thread_group(struct task_struct
*p1
, struct task_struct
*p2
)
2357 return p1
->tgid
== p2
->tgid
;
2360 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
2362 return list_entry_rcu(p
->thread_group
.next
,
2363 struct task_struct
, thread_group
);
2366 static inline int thread_group_empty(struct task_struct
*p
)
2368 return list_empty(&p
->thread_group
);
2371 #define delay_group_leader(p) \
2372 (thread_group_leader(p) && !thread_group_empty(p))
2375 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2376 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2377 * pins the final release of task.io_context. Also protects ->cpuset and
2378 * ->cgroup.subsys[]. And ->vfork_done.
2380 * Nests both inside and outside of read_lock(&tasklist_lock).
2381 * It must not be nested with write_lock_irq(&tasklist_lock),
2382 * neither inside nor outside.
2384 static inline void task_lock(struct task_struct
*p
)
2386 spin_lock(&p
->alloc_lock
);
2389 static inline void task_unlock(struct task_struct
*p
)
2391 spin_unlock(&p
->alloc_lock
);
2394 extern struct sighand_struct
*__lock_task_sighand(struct task_struct
*tsk
,
2395 unsigned long *flags
);
2397 static inline struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
2398 unsigned long *flags
)
2400 struct sighand_struct
*ret
;
2402 ret
= __lock_task_sighand(tsk
, flags
);
2403 (void)__cond_lock(&tsk
->sighand
->siglock
, ret
);
2407 static inline void unlock_task_sighand(struct task_struct
*tsk
,
2408 unsigned long *flags
)
2410 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
2413 #ifdef CONFIG_CGROUPS
2414 static inline void threadgroup_change_begin(struct task_struct
*tsk
)
2416 down_read(&tsk
->signal
->group_rwsem
);
2418 static inline void threadgroup_change_end(struct task_struct
*tsk
)
2420 up_read(&tsk
->signal
->group_rwsem
);
2424 * threadgroup_lock - lock threadgroup
2425 * @tsk: member task of the threadgroup to lock
2427 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2428 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2429 * perform exec. This is useful for cases where the threadgroup needs to
2430 * stay stable across blockable operations.
2432 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2433 * synchronization. While held, no new task will be added to threadgroup
2434 * and no existing live task will have its PF_EXITING set.
2436 * During exec, a task goes and puts its thread group through unusual
2437 * changes. After de-threading, exclusive access is assumed to resources
2438 * which are usually shared by tasks in the same group - e.g. sighand may
2439 * be replaced with a new one. Also, the exec'ing task takes over group
2440 * leader role including its pid. Exclude these changes while locked by
2441 * grabbing cred_guard_mutex which is used to synchronize exec path.
2443 static inline void threadgroup_lock(struct task_struct
*tsk
)
2446 * exec uses exit for de-threading nesting group_rwsem inside
2447 * cred_guard_mutex. Grab cred_guard_mutex first.
2449 mutex_lock(&tsk
->signal
->cred_guard_mutex
);
2450 down_write(&tsk
->signal
->group_rwsem
);
2454 * threadgroup_unlock - unlock threadgroup
2455 * @tsk: member task of the threadgroup to unlock
2457 * Reverse threadgroup_lock().
2459 static inline void threadgroup_unlock(struct task_struct
*tsk
)
2461 up_write(&tsk
->signal
->group_rwsem
);
2462 mutex_unlock(&tsk
->signal
->cred_guard_mutex
);
2465 static inline void threadgroup_change_begin(struct task_struct
*tsk
) {}
2466 static inline void threadgroup_change_end(struct task_struct
*tsk
) {}
2467 static inline void threadgroup_lock(struct task_struct
*tsk
) {}
2468 static inline void threadgroup_unlock(struct task_struct
*tsk
) {}
2471 #ifndef __HAVE_THREAD_FUNCTIONS
2473 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2474 #define task_stack_page(task) ((task)->stack)
2476 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
2478 *task_thread_info(p
) = *task_thread_info(org
);
2479 task_thread_info(p
)->task
= p
;
2482 static inline unsigned long *end_of_stack(struct task_struct
*p
)
2484 return (unsigned long *)(task_thread_info(p
) + 1);
2489 static inline int object_is_on_stack(void *obj
)
2491 void *stack
= task_stack_page(current
);
2493 return (obj
>= stack
) && (obj
< (stack
+ THREAD_SIZE
));
2496 extern void thread_info_cache_init(void);
2498 #ifdef CONFIG_DEBUG_STACK_USAGE
2499 static inline unsigned long stack_not_used(struct task_struct
*p
)
2501 unsigned long *n
= end_of_stack(p
);
2503 do { /* Skip over canary */
2507 return (unsigned long)n
- (unsigned long)end_of_stack(p
);
2511 /* set thread flags in other task's structures
2512 * - see asm/thread_info.h for TIF_xxxx flags available
2514 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2516 set_ti_thread_flag(task_thread_info(tsk
), flag
);
2519 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2521 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2524 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2526 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
2529 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2531 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2534 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2536 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
2539 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
2541 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2544 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
2546 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2549 static inline int test_tsk_need_resched(struct task_struct
*tsk
)
2551 return unlikely(test_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
));
2554 static inline int restart_syscall(void)
2556 set_tsk_thread_flag(current
, TIF_SIGPENDING
);
2557 return -ERESTARTNOINTR
;
2560 static inline int signal_pending(struct task_struct
*p
)
2562 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
2565 static inline int __fatal_signal_pending(struct task_struct
*p
)
2567 return unlikely(sigismember(&p
->pending
.signal
, SIGKILL
));
2570 static inline int fatal_signal_pending(struct task_struct
*p
)
2572 return signal_pending(p
) && __fatal_signal_pending(p
);
2575 static inline int signal_pending_state(long state
, struct task_struct
*p
)
2577 if (!(state
& (TASK_INTERRUPTIBLE
| TASK_WAKEKILL
)))
2579 if (!signal_pending(p
))
2582 return (state
& TASK_INTERRUPTIBLE
) || __fatal_signal_pending(p
);
2585 static inline int need_resched(void)
2587 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
2591 * cond_resched() and cond_resched_lock(): latency reduction via
2592 * explicit rescheduling in places that are safe. The return
2593 * value indicates whether a reschedule was done in fact.
2594 * cond_resched_lock() will drop the spinlock before scheduling,
2595 * cond_resched_softirq() will enable bhs before scheduling.
2597 extern int _cond_resched(void);
2599 #define cond_resched() ({ \
2600 __might_sleep(__FILE__, __LINE__, 0); \
2604 extern int __cond_resched_lock(spinlock_t
*lock
);
2606 #ifdef CONFIG_PREEMPT_COUNT
2607 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2609 #define PREEMPT_LOCK_OFFSET 0
2612 #define cond_resched_lock(lock) ({ \
2613 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2614 __cond_resched_lock(lock); \
2617 extern int __cond_resched_softirq(void);
2619 #define cond_resched_softirq() ({ \
2620 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2621 __cond_resched_softirq(); \
2625 * Does a critical section need to be broken due to another
2626 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2627 * but a general need for low latency)
2629 static inline int spin_needbreak(spinlock_t
*lock
)
2631 #ifdef CONFIG_PREEMPT
2632 return spin_is_contended(lock
);
2639 * Thread group CPU time accounting.
2641 void thread_group_cputime(struct task_struct
*tsk
, struct task_cputime
*times
);
2642 void thread_group_cputimer(struct task_struct
*tsk
, struct task_cputime
*times
);
2644 static inline void thread_group_cputime_init(struct signal_struct
*sig
)
2646 raw_spin_lock_init(&sig
->cputimer
.lock
);
2650 * Reevaluate whether the task has signals pending delivery.
2651 * Wake the task if so.
2652 * This is required every time the blocked sigset_t changes.
2653 * callers must hold sighand->siglock.
2655 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
2656 extern void recalc_sigpending(void);
2658 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
2661 * Wrappers for p->thread_info->cpu access. No-op on UP.
2665 static inline unsigned int task_cpu(const struct task_struct
*p
)
2667 return task_thread_info(p
)->cpu
;
2670 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
2674 static inline unsigned int task_cpu(const struct task_struct
*p
)
2679 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
2683 #endif /* CONFIG_SMP */
2685 extern long sched_setaffinity(pid_t pid
, const struct cpumask
*new_mask
);
2686 extern long sched_getaffinity(pid_t pid
, struct cpumask
*mask
);
2688 extern void normalize_rt_tasks(void);
2690 #ifdef CONFIG_CGROUP_SCHED
2692 extern struct task_group root_task_group
;
2694 extern struct task_group
*sched_create_group(struct task_group
*parent
);
2695 extern void sched_destroy_group(struct task_group
*tg
);
2696 extern void sched_move_task(struct task_struct
*tsk
);
2697 #ifdef CONFIG_FAIR_GROUP_SCHED
2698 extern int sched_group_set_shares(struct task_group
*tg
, unsigned long shares
);
2699 extern unsigned long sched_group_shares(struct task_group
*tg
);
2701 #ifdef CONFIG_RT_GROUP_SCHED
2702 extern int sched_group_set_rt_runtime(struct task_group
*tg
,
2703 long rt_runtime_us
);
2704 extern long sched_group_rt_runtime(struct task_group
*tg
);
2705 extern int sched_group_set_rt_period(struct task_group
*tg
,
2707 extern long sched_group_rt_period(struct task_group
*tg
);
2708 extern int sched_rt_can_attach(struct task_group
*tg
, struct task_struct
*tsk
);
2710 #endif /* CONFIG_CGROUP_SCHED */
2712 extern int task_can_switch_user(struct user_struct
*up
,
2713 struct task_struct
*tsk
);
2715 #ifdef CONFIG_TASK_XACCT
2716 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2718 tsk
->ioac
.rchar
+= amt
;
2721 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2723 tsk
->ioac
.wchar
+= amt
;
2726 static inline void inc_syscr(struct task_struct
*tsk
)
2731 static inline void inc_syscw(struct task_struct
*tsk
)
2736 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2740 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2744 static inline void inc_syscr(struct task_struct
*tsk
)
2748 static inline void inc_syscw(struct task_struct
*tsk
)
2753 #ifndef TASK_SIZE_OF
2754 #define TASK_SIZE_OF(tsk) TASK_SIZE
2757 #ifdef CONFIG_MM_OWNER
2758 extern void mm_update_next_owner(struct mm_struct
*mm
);
2759 extern void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
);
2761 static inline void mm_update_next_owner(struct mm_struct
*mm
)
2765 static inline void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
)
2768 #endif /* CONFIG_MM_OWNER */
2770 static inline unsigned long task_rlimit(const struct task_struct
*tsk
,
2773 return ACCESS_ONCE(tsk
->signal
->rlim
[limit
].rlim_cur
);
2776 static inline unsigned long task_rlimit_max(const struct task_struct
*tsk
,
2779 return ACCESS_ONCE(tsk
->signal
->rlim
[limit
].rlim_max
);
2782 static inline unsigned long rlimit(unsigned int limit
)
2784 return task_rlimit(current
, limit
);
2787 static inline unsigned long rlimit_max(unsigned int limit
)
2789 return task_rlimit_max(current
, limit
);