4 #include <uapi/linux/sched.h>
6 #include <linux/sched/prio.h>
13 #include <asm/param.h> /* for HZ */
15 #include <linux/capability.h>
16 #include <linux/threads.h>
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/timex.h>
20 #include <linux/jiffies.h>
21 #include <linux/plist.h>
22 #include <linux/rbtree.h>
23 #include <linux/thread_info.h>
24 #include <linux/cpumask.h>
25 #include <linux/errno.h>
26 #include <linux/nodemask.h>
27 #include <linux/mm_types.h>
28 #include <linux/preempt_mask.h>
31 #include <asm/ptrace.h>
32 #include <linux/cputime.h>
34 #include <linux/smp.h>
35 #include <linux/sem.h>
36 #include <linux/shm.h>
37 #include <linux/signal.h>
38 #include <linux/compiler.h>
39 #include <linux/completion.h>
40 #include <linux/pid.h>
41 #include <linux/percpu.h>
42 #include <linux/topology.h>
43 #include <linux/proportions.h>
44 #include <linux/seccomp.h>
45 #include <linux/rcupdate.h>
46 #include <linux/rculist.h>
47 #include <linux/rtmutex.h>
49 #include <linux/time.h>
50 #include <linux/param.h>
51 #include <linux/resource.h>
52 #include <linux/timer.h>
53 #include <linux/hrtimer.h>
54 #include <linux/task_io_accounting.h>
55 #include <linux/latencytop.h>
56 #include <linux/cred.h>
57 #include <linux/llist.h>
58 #include <linux/uidgid.h>
59 #include <linux/gfp.h>
61 #include <asm/processor.h>
63 #define SCHED_ATTR_SIZE_VER0 48 /* sizeof first published struct */
66 * Extended scheduling parameters data structure.
68 * This is needed because the original struct sched_param can not be
69 * altered without introducing ABI issues with legacy applications
70 * (e.g., in sched_getparam()).
72 * However, the possibility of specifying more than just a priority for
73 * the tasks may be useful for a wide variety of application fields, e.g.,
74 * multimedia, streaming, automation and control, and many others.
76 * This variant (sched_attr) is meant at describing a so-called
77 * sporadic time-constrained task. In such model a task is specified by:
78 * - the activation period or minimum instance inter-arrival time;
79 * - the maximum (or average, depending on the actual scheduling
80 * discipline) computation time of all instances, a.k.a. runtime;
81 * - the deadline (relative to the actual activation time) of each
83 * Very briefly, a periodic (sporadic) task asks for the execution of
84 * some specific computation --which is typically called an instance--
85 * (at most) every period. Moreover, each instance typically lasts no more
86 * than the runtime and must be completed by time instant t equal to
87 * the instance activation time + the deadline.
89 * This is reflected by the actual fields of the sched_attr structure:
91 * @size size of the structure, for fwd/bwd compat.
93 * @sched_policy task's scheduling policy
94 * @sched_flags for customizing the scheduler behaviour
95 * @sched_nice task's nice value (SCHED_NORMAL/BATCH)
96 * @sched_priority task's static priority (SCHED_FIFO/RR)
97 * @sched_deadline representative of the task's deadline
98 * @sched_runtime representative of the task's runtime
99 * @sched_period representative of the task's period
101 * Given this task model, there are a multiplicity of scheduling algorithms
102 * and policies, that can be used to ensure all the tasks will make their
103 * timing constraints.
105 * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the
106 * only user of this new interface. More information about the algorithm
107 * available in the scheduling class file or in Documentation/.
115 /* SCHED_NORMAL, SCHED_BATCH */
118 /* SCHED_FIFO, SCHED_RR */
128 struct futex_pi_state
;
129 struct robust_list_head
;
132 struct perf_event_context
;
136 #define VMACACHE_BITS 2
137 #define VMACACHE_SIZE (1U << VMACACHE_BITS)
138 #define VMACACHE_MASK (VMACACHE_SIZE - 1)
141 * These are the constant used to fake the fixed-point load-average
142 * counting. Some notes:
143 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
144 * a load-average precision of 10 bits integer + 11 bits fractional
145 * - if you want to count load-averages more often, you need more
146 * precision, or rounding will get you. With 2-second counting freq,
147 * the EXP_n values would be 1981, 2034 and 2043 if still using only
150 extern unsigned long avenrun
[]; /* Load averages */
151 extern void get_avenrun(unsigned long *loads
, unsigned long offset
, int shift
);
153 #define FSHIFT 11 /* nr of bits of precision */
154 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
155 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
156 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
157 #define EXP_5 2014 /* 1/exp(5sec/5min) */
158 #define EXP_15 2037 /* 1/exp(5sec/15min) */
160 #define CALC_LOAD(load,exp,n) \
162 load += n*(FIXED_1-exp); \
165 extern unsigned long total_forks
;
166 extern int nr_threads
;
167 DECLARE_PER_CPU(unsigned long, process_counts
);
168 extern int nr_processes(void);
169 extern unsigned long nr_running(void);
170 extern unsigned long nr_iowait(void);
171 extern unsigned long nr_iowait_cpu(int cpu
);
172 extern void get_iowait_load(unsigned long *nr_waiters
, unsigned long *load
);
174 extern void calc_global_load(unsigned long ticks
);
175 extern void update_cpu_load_nohz(void);
177 extern unsigned long get_parent_ip(unsigned long addr
);
179 extern void dump_cpu_task(int cpu
);
184 #ifdef CONFIG_SCHED_DEBUG
185 extern void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
);
186 extern void proc_sched_set_task(struct task_struct
*p
);
188 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
);
192 * Task state bitmask. NOTE! These bits are also
193 * encoded in fs/proc/array.c: get_task_state().
195 * We have two separate sets of flags: task->state
196 * is about runnability, while task->exit_state are
197 * about the task exiting. Confusing, but this way
198 * modifying one set can't modify the other one by
201 #define TASK_RUNNING 0
202 #define TASK_INTERRUPTIBLE 1
203 #define TASK_UNINTERRUPTIBLE 2
204 #define __TASK_STOPPED 4
205 #define __TASK_TRACED 8
206 /* in tsk->exit_state */
208 #define EXIT_ZOMBIE 32
209 #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
210 /* in tsk->state again */
212 #define TASK_WAKEKILL 128
213 #define TASK_WAKING 256
214 #define TASK_PARKED 512
215 #define TASK_STATE_MAX 1024
217 #define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWP"
219 extern char ___assert_task_state
[1 - 2*!!(
220 sizeof(TASK_STATE_TO_CHAR_STR
)-1 != ilog2(TASK_STATE_MAX
)+1)];
222 /* Convenience macros for the sake of set_task_state */
223 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
224 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
225 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
227 /* Convenience macros for the sake of wake_up */
228 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
229 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
231 /* get_task_state() */
232 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
233 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
234 __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD)
236 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
237 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
238 #define task_is_stopped_or_traced(task) \
239 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
240 #define task_contributes_to_load(task) \
241 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
242 (task->flags & PF_FROZEN) == 0)
244 #define __set_task_state(tsk, state_value) \
245 do { (tsk)->state = (state_value); } while (0)
246 #define set_task_state(tsk, state_value) \
247 set_mb((tsk)->state, (state_value))
250 * set_current_state() includes a barrier so that the write of current->state
251 * is correctly serialised wrt the caller's subsequent test of whether to
254 * set_current_state(TASK_UNINTERRUPTIBLE);
255 * if (do_i_need_to_sleep())
258 * If the caller does not need such serialisation then use __set_current_state()
260 #define __set_current_state(state_value) \
261 do { current->state = (state_value); } while (0)
262 #define set_current_state(state_value) \
263 set_mb(current->state, (state_value))
265 /* Task command name length */
266 #define TASK_COMM_LEN 16
268 #include <linux/spinlock.h>
271 * This serializes "schedule()" and also protects
272 * the run-queue from deletions/modifications (but
273 * _adding_ to the beginning of the run-queue has
276 extern rwlock_t tasklist_lock
;
277 extern spinlock_t mmlist_lock
;
281 #ifdef CONFIG_PROVE_RCU
282 extern int lockdep_tasklist_lock_is_held(void);
283 #endif /* #ifdef CONFIG_PROVE_RCU */
285 extern void sched_init(void);
286 extern void sched_init_smp(void);
287 extern asmlinkage
void schedule_tail(struct task_struct
*prev
);
288 extern void init_idle(struct task_struct
*idle
, int cpu
);
289 extern void init_idle_bootup_task(struct task_struct
*idle
);
291 extern int runqueue_is_locked(int cpu
);
293 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
294 extern void nohz_balance_enter_idle(int cpu
);
295 extern void set_cpu_sd_state_idle(void);
296 extern int get_nohz_timer_target(int pinned
);
298 static inline void nohz_balance_enter_idle(int cpu
) { }
299 static inline void set_cpu_sd_state_idle(void) { }
300 static inline int get_nohz_timer_target(int pinned
)
302 return smp_processor_id();
307 * Only dump TASK_* tasks. (0 for all tasks)
309 extern void show_state_filter(unsigned long state_filter
);
311 static inline void show_state(void)
313 show_state_filter(0);
316 extern void show_regs(struct pt_regs
*);
319 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
320 * task), SP is the stack pointer of the first frame that should be shown in the back
321 * trace (or NULL if the entire call-chain of the task should be shown).
323 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
325 void io_schedule(void);
326 long io_schedule_timeout(long timeout
);
328 extern void cpu_init (void);
329 extern void trap_init(void);
330 extern void update_process_times(int user
);
331 extern void scheduler_tick(void);
333 extern void sched_show_task(struct task_struct
*p
);
335 #ifdef CONFIG_LOCKUP_DETECTOR
336 extern void touch_softlockup_watchdog(void);
337 extern void touch_softlockup_watchdog_sync(void);
338 extern void touch_all_softlockup_watchdogs(void);
339 extern int proc_dowatchdog_thresh(struct ctl_table
*table
, int write
,
341 size_t *lenp
, loff_t
*ppos
);
342 extern unsigned int softlockup_panic
;
343 void lockup_detector_init(void);
345 static inline void touch_softlockup_watchdog(void)
348 static inline void touch_softlockup_watchdog_sync(void)
351 static inline void touch_all_softlockup_watchdogs(void)
354 static inline void lockup_detector_init(void)
359 #ifdef CONFIG_DETECT_HUNG_TASK
360 void reset_hung_task_detector(void);
362 static inline void reset_hung_task_detector(void)
367 /* Attach to any functions which should be ignored in wchan output. */
368 #define __sched __attribute__((__section__(".sched.text")))
370 /* Linker adds these: start and end of __sched functions */
371 extern char __sched_text_start
[], __sched_text_end
[];
373 /* Is this address in the __sched functions? */
374 extern int in_sched_functions(unsigned long addr
);
376 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
377 extern signed long schedule_timeout(signed long timeout
);
378 extern signed long schedule_timeout_interruptible(signed long timeout
);
379 extern signed long schedule_timeout_killable(signed long timeout
);
380 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
381 asmlinkage
void schedule(void);
382 extern void schedule_preempt_disabled(void);
385 struct user_namespace
;
388 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
390 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
391 unsigned long, unsigned long);
393 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
394 unsigned long len
, unsigned long pgoff
,
395 unsigned long flags
);
397 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
) {}
400 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */
401 #define SUID_DUMP_USER 1 /* Dump as user of process */
402 #define SUID_DUMP_ROOT 2 /* Dump as root */
406 /* for SUID_DUMP_* above */
407 #define MMF_DUMPABLE_BITS 2
408 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
410 extern void set_dumpable(struct mm_struct
*mm
, int value
);
412 * This returns the actual value of the suid_dumpable flag. For things
413 * that are using this for checking for privilege transitions, it must
414 * test against SUID_DUMP_USER rather than treating it as a boolean
417 static inline int __get_dumpable(unsigned long mm_flags
)
419 return mm_flags
& MMF_DUMPABLE_MASK
;
422 static inline int get_dumpable(struct mm_struct
*mm
)
424 return __get_dumpable(mm
->flags
);
427 /* coredump filter bits */
428 #define MMF_DUMP_ANON_PRIVATE 2
429 #define MMF_DUMP_ANON_SHARED 3
430 #define MMF_DUMP_MAPPED_PRIVATE 4
431 #define MMF_DUMP_MAPPED_SHARED 5
432 #define MMF_DUMP_ELF_HEADERS 6
433 #define MMF_DUMP_HUGETLB_PRIVATE 7
434 #define MMF_DUMP_HUGETLB_SHARED 8
436 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
437 #define MMF_DUMP_FILTER_BITS 7
438 #define MMF_DUMP_FILTER_MASK \
439 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
440 #define MMF_DUMP_FILTER_DEFAULT \
441 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
442 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
444 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
445 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
447 # define MMF_DUMP_MASK_DEFAULT_ELF 0
449 /* leave room for more dump flags */
450 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
451 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
452 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
454 #define MMF_HAS_UPROBES 19 /* has uprobes */
455 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
457 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
459 struct sighand_struct
{
461 struct k_sigaction action
[_NSIG
];
463 wait_queue_head_t signalfd_wqh
;
466 struct pacct_struct
{
469 unsigned long ac_mem
;
470 cputime_t ac_utime
, ac_stime
;
471 unsigned long ac_minflt
, ac_majflt
;
482 * struct cputime - snaphsot of system and user cputime
483 * @utime: time spent in user mode
484 * @stime: time spent in system mode
486 * Gathers a generic snapshot of user and system time.
494 * struct task_cputime - collected CPU time counts
495 * @utime: time spent in user mode, in &cputime_t units
496 * @stime: time spent in kernel mode, in &cputime_t units
497 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
499 * This is an extension of struct cputime that includes the total runtime
500 * spent by the task from the scheduler point of view.
502 * As a result, this structure groups together three kinds of CPU time
503 * that are tracked for threads and thread groups. Most things considering
504 * CPU time want to group these counts together and treat all three
505 * of them in parallel.
507 struct task_cputime
{
510 unsigned long long sum_exec_runtime
;
512 /* Alternate field names when used to cache expirations. */
513 #define prof_exp stime
514 #define virt_exp utime
515 #define sched_exp sum_exec_runtime
517 #define INIT_CPUTIME \
518 (struct task_cputime) { \
521 .sum_exec_runtime = 0, \
524 #ifdef CONFIG_PREEMPT_COUNT
525 #define PREEMPT_DISABLED (1 + PREEMPT_ENABLED)
527 #define PREEMPT_DISABLED PREEMPT_ENABLED
531 * Disable preemption until the scheduler is running.
532 * Reset by start_kernel()->sched_init()->init_idle().
534 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
535 * before the scheduler is active -- see should_resched().
537 #define INIT_PREEMPT_COUNT (PREEMPT_DISABLED + PREEMPT_ACTIVE)
540 * struct thread_group_cputimer - thread group interval timer counts
541 * @cputime: thread group interval timers.
542 * @running: non-zero when there are timers running and
543 * @cputime receives updates.
544 * @lock: lock for fields in this struct.
546 * This structure contains the version of task_cputime, above, that is
547 * used for thread group CPU timer calculations.
549 struct thread_group_cputimer
{
550 struct task_cputime cputime
;
555 #include <linux/rwsem.h>
559 * NOTE! "signal_struct" does not have its own
560 * locking, because a shared signal_struct always
561 * implies a shared sighand_struct, so locking
562 * sighand_struct is always a proper superset of
563 * the locking of signal_struct.
565 struct signal_struct
{
569 struct list_head thread_head
;
571 wait_queue_head_t wait_chldexit
; /* for wait4() */
573 /* current thread group signal load-balancing target: */
574 struct task_struct
*curr_target
;
576 /* shared signal handling: */
577 struct sigpending shared_pending
;
579 /* thread group exit support */
582 * - notify group_exit_task when ->count is equal to notify_count
583 * - everyone except group_exit_task is stopped during signal delivery
584 * of fatal signals, group_exit_task processes the signal.
587 struct task_struct
*group_exit_task
;
589 /* thread group stop support, overloads group_exit_code too */
590 int group_stop_count
;
591 unsigned int flags
; /* see SIGNAL_* flags below */
594 * PR_SET_CHILD_SUBREAPER marks a process, like a service
595 * manager, to re-parent orphan (double-forking) child processes
596 * to this process instead of 'init'. The service manager is
597 * able to receive SIGCHLD signals and is able to investigate
598 * the process until it calls wait(). All children of this
599 * process will inherit a flag if they should look for a
600 * child_subreaper process at exit.
602 unsigned int is_child_subreaper
:1;
603 unsigned int has_child_subreaper
:1;
605 /* POSIX.1b Interval Timers */
607 struct list_head posix_timers
;
609 /* ITIMER_REAL timer for the process */
610 struct hrtimer real_timer
;
611 struct pid
*leader_pid
;
612 ktime_t it_real_incr
;
615 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
616 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
617 * values are defined to 0 and 1 respectively
619 struct cpu_itimer it
[2];
622 * Thread group totals for process CPU timers.
623 * See thread_group_cputimer(), et al, for details.
625 struct thread_group_cputimer cputimer
;
627 /* Earliest-expiration cache. */
628 struct task_cputime cputime_expires
;
630 struct list_head cpu_timers
[3];
632 struct pid
*tty_old_pgrp
;
634 /* boolean value for session group leader */
637 struct tty_struct
*tty
; /* NULL if no tty */
639 #ifdef CONFIG_SCHED_AUTOGROUP
640 struct autogroup
*autogroup
;
643 * Cumulative resource counters for dead threads in the group,
644 * and for reaped dead child processes forked by this group.
645 * Live threads maintain their own counters and add to these
646 * in __exit_signal, except for the group leader.
648 cputime_t utime
, stime
, cutime
, cstime
;
651 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
652 struct cputime prev_cputime
;
654 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
655 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
656 unsigned long inblock
, oublock
, cinblock
, coublock
;
657 unsigned long maxrss
, cmaxrss
;
658 struct task_io_accounting ioac
;
661 * Cumulative ns of schedule CPU time fo dead threads in the
662 * group, not including a zombie group leader, (This only differs
663 * from jiffies_to_ns(utime + stime) if sched_clock uses something
664 * other than jiffies.)
666 unsigned long long sum_sched_runtime
;
669 * We don't bother to synchronize most readers of this at all,
670 * because there is no reader checking a limit that actually needs
671 * to get both rlim_cur and rlim_max atomically, and either one
672 * alone is a single word that can safely be read normally.
673 * getrlimit/setrlimit use task_lock(current->group_leader) to
674 * protect this instead of the siglock, because they really
675 * have no need to disable irqs.
677 struct rlimit rlim
[RLIM_NLIMITS
];
679 #ifdef CONFIG_BSD_PROCESS_ACCT
680 struct pacct_struct pacct
; /* per-process accounting information */
682 #ifdef CONFIG_TASKSTATS
683 struct taskstats
*stats
;
687 unsigned audit_tty_log_passwd
;
688 struct tty_audit_buf
*tty_audit_buf
;
690 #ifdef CONFIG_CGROUPS
692 * group_rwsem prevents new tasks from entering the threadgroup and
693 * member tasks from exiting,a more specifically, setting of
694 * PF_EXITING. fork and exit paths are protected with this rwsem
695 * using threadgroup_change_begin/end(). Users which require
696 * threadgroup to remain stable should use threadgroup_[un]lock()
697 * which also takes care of exec path. Currently, cgroup is the
700 struct rw_semaphore group_rwsem
;
703 oom_flags_t oom_flags
;
704 short oom_score_adj
; /* OOM kill score adjustment */
705 short oom_score_adj_min
; /* OOM kill score adjustment min value.
706 * Only settable by CAP_SYS_RESOURCE. */
708 struct mutex cred_guard_mutex
; /* guard against foreign influences on
709 * credential calculations
710 * (notably. ptrace) */
714 * Bits in flags field of signal_struct.
716 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
717 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
718 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
719 #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */
721 * Pending notifications to parent.
723 #define SIGNAL_CLD_STOPPED 0x00000010
724 #define SIGNAL_CLD_CONTINUED 0x00000020
725 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
727 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
729 /* If true, all threads except ->group_exit_task have pending SIGKILL */
730 static inline int signal_group_exit(const struct signal_struct
*sig
)
732 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
733 (sig
->group_exit_task
!= NULL
);
737 * Some day this will be a full-fledged user tracking system..
740 atomic_t __count
; /* reference count */
741 atomic_t processes
; /* How many processes does this user have? */
742 atomic_t sigpending
; /* How many pending signals does this user have? */
743 #ifdef CONFIG_INOTIFY_USER
744 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
745 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
747 #ifdef CONFIG_FANOTIFY
748 atomic_t fanotify_listeners
;
751 atomic_long_t epoll_watches
; /* The number of file descriptors currently watched */
753 #ifdef CONFIG_POSIX_MQUEUE
754 /* protected by mq_lock */
755 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
757 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
760 struct key
*uid_keyring
; /* UID specific keyring */
761 struct key
*session_keyring
; /* UID's default session keyring */
764 /* Hash table maintenance information */
765 struct hlist_node uidhash_node
;
768 #ifdef CONFIG_PERF_EVENTS
769 atomic_long_t locked_vm
;
773 extern int uids_sysfs_init(void);
775 extern struct user_struct
*find_user(kuid_t
);
777 extern struct user_struct root_user
;
778 #define INIT_USER (&root_user)
781 struct backing_dev_info
;
782 struct reclaim_state
;
784 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
786 /* cumulative counters */
787 unsigned long pcount
; /* # of times run on this cpu */
788 unsigned long long run_delay
; /* time spent waiting on a runqueue */
791 unsigned long long last_arrival
,/* when we last ran on a cpu */
792 last_queued
; /* when we were last queued to run */
794 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
796 #ifdef CONFIG_TASK_DELAY_ACCT
797 struct task_delay_info
{
799 unsigned int flags
; /* Private per-task flags */
801 /* For each stat XXX, add following, aligned appropriately
803 * struct timespec XXX_start, XXX_end;
807 * Atomicity of updates to XXX_delay, XXX_count protected by
808 * single lock above (split into XXX_lock if contention is an issue).
812 * XXX_count is incremented on every XXX operation, the delay
813 * associated with the operation is added to XXX_delay.
814 * XXX_delay contains the accumulated delay time in nanoseconds.
816 u64 blkio_start
; /* Shared by blkio, swapin */
817 u64 blkio_delay
; /* wait for sync block io completion */
818 u64 swapin_delay
; /* wait for swapin block io completion */
819 u32 blkio_count
; /* total count of the number of sync block */
820 /* io operations performed */
821 u32 swapin_count
; /* total count of the number of swapin block */
822 /* io operations performed */
825 u64 freepages_delay
; /* wait for memory reclaim */
826 u32 freepages_count
; /* total count of memory reclaim */
828 #endif /* CONFIG_TASK_DELAY_ACCT */
830 static inline int sched_info_on(void)
832 #ifdef CONFIG_SCHEDSTATS
834 #elif defined(CONFIG_TASK_DELAY_ACCT)
835 extern int delayacct_on
;
850 * Increase resolution of cpu_capacity calculations
852 #define SCHED_CAPACITY_SHIFT 10
853 #define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT)
856 * sched-domains (multiprocessor balancing) declarations:
859 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
860 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
861 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
862 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
863 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
864 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
865 #define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share cpu power */
866 #define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */
867 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
868 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
869 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
870 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
871 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
872 #define SD_NUMA 0x4000 /* cross-node balancing */
874 #ifdef CONFIG_SCHED_SMT
875 static inline int cpu_smt_flags(void)
877 return SD_SHARE_CPUCAPACITY
| SD_SHARE_PKG_RESOURCES
;
881 #ifdef CONFIG_SCHED_MC
882 static inline int cpu_core_flags(void)
884 return SD_SHARE_PKG_RESOURCES
;
889 static inline int cpu_numa_flags(void)
895 struct sched_domain_attr
{
896 int relax_domain_level
;
899 #define SD_ATTR_INIT (struct sched_domain_attr) { \
900 .relax_domain_level = -1, \
903 extern int sched_domain_level_max
;
907 struct sched_domain
{
908 /* These fields must be setup */
909 struct sched_domain
*parent
; /* top domain must be null terminated */
910 struct sched_domain
*child
; /* bottom domain must be null terminated */
911 struct sched_group
*groups
; /* the balancing groups of the domain */
912 unsigned long min_interval
; /* Minimum balance interval ms */
913 unsigned long max_interval
; /* Maximum balance interval ms */
914 unsigned int busy_factor
; /* less balancing by factor if busy */
915 unsigned int imbalance_pct
; /* No balance until over watermark */
916 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
917 unsigned int busy_idx
;
918 unsigned int idle_idx
;
919 unsigned int newidle_idx
;
920 unsigned int wake_idx
;
921 unsigned int forkexec_idx
;
922 unsigned int smt_gain
;
924 int nohz_idle
; /* NOHZ IDLE status */
925 int flags
; /* See SD_* */
928 /* Runtime fields. */
929 unsigned long last_balance
; /* init to jiffies. units in jiffies */
930 unsigned int balance_interval
; /* initialise to 1. units in ms. */
931 unsigned int nr_balance_failed
; /* initialise to 0 */
933 /* idle_balance() stats */
934 u64 max_newidle_lb_cost
;
935 unsigned long next_decay_max_lb_cost
;
937 #ifdef CONFIG_SCHEDSTATS
938 /* load_balance() stats */
939 unsigned int lb_count
[CPU_MAX_IDLE_TYPES
];
940 unsigned int lb_failed
[CPU_MAX_IDLE_TYPES
];
941 unsigned int lb_balanced
[CPU_MAX_IDLE_TYPES
];
942 unsigned int lb_imbalance
[CPU_MAX_IDLE_TYPES
];
943 unsigned int lb_gained
[CPU_MAX_IDLE_TYPES
];
944 unsigned int lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
945 unsigned int lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
946 unsigned int lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
948 /* Active load balancing */
949 unsigned int alb_count
;
950 unsigned int alb_failed
;
951 unsigned int alb_pushed
;
953 /* SD_BALANCE_EXEC stats */
954 unsigned int sbe_count
;
955 unsigned int sbe_balanced
;
956 unsigned int sbe_pushed
;
958 /* SD_BALANCE_FORK stats */
959 unsigned int sbf_count
;
960 unsigned int sbf_balanced
;
961 unsigned int sbf_pushed
;
963 /* try_to_wake_up() stats */
964 unsigned int ttwu_wake_remote
;
965 unsigned int ttwu_move_affine
;
966 unsigned int ttwu_move_balance
;
968 #ifdef CONFIG_SCHED_DEBUG
972 void *private; /* used during construction */
973 struct rcu_head rcu
; /* used during destruction */
976 unsigned int span_weight
;
978 * Span of all CPUs in this domain.
980 * NOTE: this field is variable length. (Allocated dynamically
981 * by attaching extra space to the end of the structure,
982 * depending on how many CPUs the kernel has booted up with)
984 unsigned long span
[0];
987 static inline struct cpumask
*sched_domain_span(struct sched_domain
*sd
)
989 return to_cpumask(sd
->span
);
992 extern void partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
993 struct sched_domain_attr
*dattr_new
);
995 /* Allocate an array of sched domains, for partition_sched_domains(). */
996 cpumask_var_t
*alloc_sched_domains(unsigned int ndoms
);
997 void free_sched_domains(cpumask_var_t doms
[], unsigned int ndoms
);
999 bool cpus_share_cache(int this_cpu
, int that_cpu
);
1001 typedef const struct cpumask
*(*sched_domain_mask_f
)(int cpu
);
1002 typedef int (*sched_domain_flags_f
)(void);
1004 #define SDTL_OVERLAP 0x01
1007 struct sched_domain
**__percpu sd
;
1008 struct sched_group
**__percpu sg
;
1009 struct sched_group_capacity
**__percpu sgc
;
1012 struct sched_domain_topology_level
{
1013 sched_domain_mask_f mask
;
1014 sched_domain_flags_f sd_flags
;
1017 struct sd_data data
;
1018 #ifdef CONFIG_SCHED_DEBUG
1023 extern struct sched_domain_topology_level
*sched_domain_topology
;
1025 extern void set_sched_topology(struct sched_domain_topology_level
*tl
);
1027 #ifdef CONFIG_SCHED_DEBUG
1028 # define SD_INIT_NAME(type) .name = #type
1030 # define SD_INIT_NAME(type)
1033 #else /* CONFIG_SMP */
1035 struct sched_domain_attr
;
1038 partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
1039 struct sched_domain_attr
*dattr_new
)
1043 static inline bool cpus_share_cache(int this_cpu
, int that_cpu
)
1048 #endif /* !CONFIG_SMP */
1051 struct io_context
; /* See blkdev.h */
1054 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1055 extern void prefetch_stack(struct task_struct
*t
);
1057 static inline void prefetch_stack(struct task_struct
*t
) { }
1060 struct audit_context
; /* See audit.c */
1062 struct pipe_inode_info
;
1063 struct uts_namespace
;
1065 struct load_weight
{
1066 unsigned long weight
;
1072 * These sums represent an infinite geometric series and so are bound
1073 * above by 1024/(1-y). Thus we only need a u32 to store them for all
1074 * choices of y < 1-2^(-32)*1024.
1076 u32 runnable_avg_sum
, runnable_avg_period
;
1077 u64 last_runnable_update
;
1079 unsigned long load_avg_contrib
;
1082 #ifdef CONFIG_SCHEDSTATS
1083 struct sched_statistics
{
1093 s64 sum_sleep_runtime
;
1100 u64 nr_migrations_cold
;
1101 u64 nr_failed_migrations_affine
;
1102 u64 nr_failed_migrations_running
;
1103 u64 nr_failed_migrations_hot
;
1104 u64 nr_forced_migrations
;
1107 u64 nr_wakeups_sync
;
1108 u64 nr_wakeups_migrate
;
1109 u64 nr_wakeups_local
;
1110 u64 nr_wakeups_remote
;
1111 u64 nr_wakeups_affine
;
1112 u64 nr_wakeups_affine_attempts
;
1113 u64 nr_wakeups_passive
;
1114 u64 nr_wakeups_idle
;
1118 struct sched_entity
{
1119 struct load_weight load
; /* for load-balancing */
1120 struct rb_node run_node
;
1121 struct list_head group_node
;
1125 u64 sum_exec_runtime
;
1127 u64 prev_sum_exec_runtime
;
1131 #ifdef CONFIG_SCHEDSTATS
1132 struct sched_statistics statistics
;
1135 #ifdef CONFIG_FAIR_GROUP_SCHED
1137 struct sched_entity
*parent
;
1138 /* rq on which this entity is (to be) queued: */
1139 struct cfs_rq
*cfs_rq
;
1140 /* rq "owned" by this entity/group: */
1141 struct cfs_rq
*my_q
;
1145 /* Per-entity load-tracking */
1146 struct sched_avg avg
;
1150 struct sched_rt_entity
{
1151 struct list_head run_list
;
1152 unsigned long timeout
;
1153 unsigned long watchdog_stamp
;
1154 unsigned int time_slice
;
1156 struct sched_rt_entity
*back
;
1157 #ifdef CONFIG_RT_GROUP_SCHED
1158 struct sched_rt_entity
*parent
;
1159 /* rq on which this entity is (to be) queued: */
1160 struct rt_rq
*rt_rq
;
1161 /* rq "owned" by this entity/group: */
1166 struct sched_dl_entity
{
1167 struct rb_node rb_node
;
1170 * Original scheduling parameters. Copied here from sched_attr
1171 * during sched_setattr(), they will remain the same until
1172 * the next sched_setattr().
1174 u64 dl_runtime
; /* maximum runtime for each instance */
1175 u64 dl_deadline
; /* relative deadline of each instance */
1176 u64 dl_period
; /* separation of two instances (period) */
1177 u64 dl_bw
; /* dl_runtime / dl_deadline */
1180 * Actual scheduling parameters. Initialized with the values above,
1181 * they are continously updated during task execution. Note that
1182 * the remaining runtime could be < 0 in case we are in overrun.
1184 s64 runtime
; /* remaining runtime for this instance */
1185 u64 deadline
; /* absolute deadline for this instance */
1186 unsigned int flags
; /* specifying the scheduler behaviour */
1191 * @dl_throttled tells if we exhausted the runtime. If so, the
1192 * task has to wait for a replenishment to be performed at the
1193 * next firing of dl_timer.
1195 * @dl_new tells if a new instance arrived. If so we must
1196 * start executing it with full runtime and reset its absolute
1199 * @dl_boosted tells if we are boosted due to DI. If so we are
1200 * outside bandwidth enforcement mechanism (but only until we
1201 * exit the critical section);
1203 * @dl_yielded tells if task gave up the cpu before consuming
1204 * all its available runtime during the last job.
1206 int dl_throttled
, dl_new
, dl_boosted
, dl_yielded
;
1209 * Bandwidth enforcement timer. Each -deadline task has its
1210 * own bandwidth to be enforced, thus we need one timer per task.
1212 struct hrtimer dl_timer
;
1224 enum perf_event_task_context
{
1225 perf_invalid_context
= -1,
1226 perf_hw_context
= 0,
1228 perf_nr_task_contexts
,
1231 struct task_struct
{
1232 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
1235 unsigned int flags
; /* per process flags, defined below */
1236 unsigned int ptrace
;
1239 struct llist_node wake_entry
;
1241 struct task_struct
*last_wakee
;
1242 unsigned long wakee_flips
;
1243 unsigned long wakee_flip_decay_ts
;
1249 int prio
, static_prio
, normal_prio
;
1250 unsigned int rt_priority
;
1251 const struct sched_class
*sched_class
;
1252 struct sched_entity se
;
1253 struct sched_rt_entity rt
;
1254 #ifdef CONFIG_CGROUP_SCHED
1255 struct task_group
*sched_task_group
;
1257 struct sched_dl_entity dl
;
1259 #ifdef CONFIG_PREEMPT_NOTIFIERS
1260 /* list of struct preempt_notifier: */
1261 struct hlist_head preempt_notifiers
;
1264 #ifdef CONFIG_BLK_DEV_IO_TRACE
1265 unsigned int btrace_seq
;
1268 unsigned int policy
;
1269 int nr_cpus_allowed
;
1270 cpumask_t cpus_allowed
;
1272 #ifdef CONFIG_PREEMPT_RCU
1273 int rcu_read_lock_nesting
;
1274 union rcu_special rcu_read_unlock_special
;
1275 struct list_head rcu_node_entry
;
1276 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1277 #ifdef CONFIG_TREE_PREEMPT_RCU
1278 struct rcu_node
*rcu_blocked_node
;
1279 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1280 #ifdef CONFIG_TASKS_RCU
1281 unsigned long rcu_tasks_nvcsw
;
1282 bool rcu_tasks_holdout
;
1283 struct list_head rcu_tasks_holdout_list
;
1284 int rcu_tasks_idle_cpu
;
1285 #endif /* #ifdef CONFIG_TASKS_RCU */
1287 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1288 struct sched_info sched_info
;
1291 struct list_head tasks
;
1293 struct plist_node pushable_tasks
;
1294 struct rb_node pushable_dl_tasks
;
1297 struct mm_struct
*mm
, *active_mm
;
1298 #ifdef CONFIG_COMPAT_BRK
1299 unsigned brk_randomized
:1;
1301 /* per-thread vma caching */
1302 u32 vmacache_seqnum
;
1303 struct vm_area_struct
*vmacache
[VMACACHE_SIZE
];
1304 #if defined(SPLIT_RSS_COUNTING)
1305 struct task_rss_stat rss_stat
;
1309 int exit_code
, exit_signal
;
1310 int pdeath_signal
; /* The signal sent when the parent dies */
1311 unsigned int jobctl
; /* JOBCTL_*, siglock protected */
1313 /* Used for emulating ABI behavior of previous Linux versions */
1314 unsigned int personality
;
1316 unsigned in_execve
:1; /* Tell the LSMs that the process is doing an
1318 unsigned in_iowait
:1;
1320 /* Revert to default priority/policy when forking */
1321 unsigned sched_reset_on_fork
:1;
1322 unsigned sched_contributes_to_load
:1;
1324 unsigned long atomic_flags
; /* Flags needing atomic access. */
1329 #ifdef CONFIG_CC_STACKPROTECTOR
1330 /* Canary value for the -fstack-protector gcc feature */
1331 unsigned long stack_canary
;
1334 * pointers to (original) parent process, youngest child, younger sibling,
1335 * older sibling, respectively. (p->father can be replaced with
1336 * p->real_parent->pid)
1338 struct task_struct __rcu
*real_parent
; /* real parent process */
1339 struct task_struct __rcu
*parent
; /* recipient of SIGCHLD, wait4() reports */
1341 * children/sibling forms the list of my natural children
1343 struct list_head children
; /* list of my children */
1344 struct list_head sibling
; /* linkage in my parent's children list */
1345 struct task_struct
*group_leader
; /* threadgroup leader */
1348 * ptraced is the list of tasks this task is using ptrace on.
1349 * This includes both natural children and PTRACE_ATTACH targets.
1350 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1352 struct list_head ptraced
;
1353 struct list_head ptrace_entry
;
1355 /* PID/PID hash table linkage. */
1356 struct pid_link pids
[PIDTYPE_MAX
];
1357 struct list_head thread_group
;
1358 struct list_head thread_node
;
1360 struct completion
*vfork_done
; /* for vfork() */
1361 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
1362 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
1364 cputime_t utime
, stime
, utimescaled
, stimescaled
;
1366 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
1367 struct cputime prev_cputime
;
1369 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1370 seqlock_t vtime_seqlock
;
1371 unsigned long long vtime_snap
;
1376 } vtime_snap_whence
;
1378 unsigned long nvcsw
, nivcsw
; /* context switch counts */
1379 u64 start_time
; /* monotonic time in nsec */
1380 u64 real_start_time
; /* boot based time in nsec */
1381 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1382 unsigned long min_flt
, maj_flt
;
1384 struct task_cputime cputime_expires
;
1385 struct list_head cpu_timers
[3];
1387 /* process credentials */
1388 const struct cred __rcu
*real_cred
; /* objective and real subjective task
1389 * credentials (COW) */
1390 const struct cred __rcu
*cred
; /* effective (overridable) subjective task
1391 * credentials (COW) */
1392 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
1393 - access with [gs]et_task_comm (which lock
1394 it with task_lock())
1395 - initialized normally by setup_new_exec */
1396 /* file system info */
1397 int link_count
, total_link_count
;
1398 #ifdef CONFIG_SYSVIPC
1400 struct sysv_sem sysvsem
;
1401 struct sysv_shm sysvshm
;
1403 #ifdef CONFIG_DETECT_HUNG_TASK
1404 /* hung task detection */
1405 unsigned long last_switch_count
;
1407 /* CPU-specific state of this task */
1408 struct thread_struct thread
;
1409 /* filesystem information */
1410 struct fs_struct
*fs
;
1411 /* open file information */
1412 struct files_struct
*files
;
1414 struct nsproxy
*nsproxy
;
1415 /* signal handlers */
1416 struct signal_struct
*signal
;
1417 struct sighand_struct
*sighand
;
1419 sigset_t blocked
, real_blocked
;
1420 sigset_t saved_sigmask
; /* restored if set_restore_sigmask() was used */
1421 struct sigpending pending
;
1423 unsigned long sas_ss_sp
;
1425 int (*notifier
)(void *priv
);
1426 void *notifier_data
;
1427 sigset_t
*notifier_mask
;
1428 struct callback_head
*task_works
;
1430 struct audit_context
*audit_context
;
1431 #ifdef CONFIG_AUDITSYSCALL
1433 unsigned int sessionid
;
1435 struct seccomp seccomp
;
1437 /* Thread group tracking */
1440 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1442 spinlock_t alloc_lock
;
1444 /* Protection of the PI data structures: */
1445 raw_spinlock_t pi_lock
;
1447 #ifdef CONFIG_RT_MUTEXES
1448 /* PI waiters blocked on a rt_mutex held by this task */
1449 struct rb_root pi_waiters
;
1450 struct rb_node
*pi_waiters_leftmost
;
1451 /* Deadlock detection and priority inheritance handling */
1452 struct rt_mutex_waiter
*pi_blocked_on
;
1455 #ifdef CONFIG_DEBUG_MUTEXES
1456 /* mutex deadlock detection */
1457 struct mutex_waiter
*blocked_on
;
1459 #ifdef CONFIG_TRACE_IRQFLAGS
1460 unsigned int irq_events
;
1461 unsigned long hardirq_enable_ip
;
1462 unsigned long hardirq_disable_ip
;
1463 unsigned int hardirq_enable_event
;
1464 unsigned int hardirq_disable_event
;
1465 int hardirqs_enabled
;
1466 int hardirq_context
;
1467 unsigned long softirq_disable_ip
;
1468 unsigned long softirq_enable_ip
;
1469 unsigned int softirq_disable_event
;
1470 unsigned int softirq_enable_event
;
1471 int softirqs_enabled
;
1472 int softirq_context
;
1474 #ifdef CONFIG_LOCKDEP
1475 # define MAX_LOCK_DEPTH 48UL
1478 unsigned int lockdep_recursion
;
1479 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1480 gfp_t lockdep_reclaim_gfp
;
1483 /* journalling filesystem info */
1486 /* stacked block device info */
1487 struct bio_list
*bio_list
;
1490 /* stack plugging */
1491 struct blk_plug
*plug
;
1495 struct reclaim_state
*reclaim_state
;
1497 struct backing_dev_info
*backing_dev_info
;
1499 struct io_context
*io_context
;
1501 unsigned long ptrace_message
;
1502 siginfo_t
*last_siginfo
; /* For ptrace use. */
1503 struct task_io_accounting ioac
;
1504 #if defined(CONFIG_TASK_XACCT)
1505 u64 acct_rss_mem1
; /* accumulated rss usage */
1506 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1507 cputime_t acct_timexpd
; /* stime + utime since last update */
1509 #ifdef CONFIG_CPUSETS
1510 nodemask_t mems_allowed
; /* Protected by alloc_lock */
1511 seqcount_t mems_allowed_seq
; /* Seqence no to catch updates */
1512 int cpuset_mem_spread_rotor
;
1513 int cpuset_slab_spread_rotor
;
1515 #ifdef CONFIG_CGROUPS
1516 /* Control Group info protected by css_set_lock */
1517 struct css_set __rcu
*cgroups
;
1518 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1519 struct list_head cg_list
;
1522 struct robust_list_head __user
*robust_list
;
1523 #ifdef CONFIG_COMPAT
1524 struct compat_robust_list_head __user
*compat_robust_list
;
1526 struct list_head pi_state_list
;
1527 struct futex_pi_state
*pi_state_cache
;
1529 #ifdef CONFIG_PERF_EVENTS
1530 struct perf_event_context
*perf_event_ctxp
[perf_nr_task_contexts
];
1531 struct mutex perf_event_mutex
;
1532 struct list_head perf_event_list
;
1534 #ifdef CONFIG_DEBUG_PREEMPT
1535 unsigned long preempt_disable_ip
;
1538 struct mempolicy
*mempolicy
; /* Protected by alloc_lock */
1540 short pref_node_fork
;
1542 #ifdef CONFIG_NUMA_BALANCING
1544 unsigned int numa_scan_period
;
1545 unsigned int numa_scan_period_max
;
1546 int numa_preferred_nid
;
1547 unsigned long numa_migrate_retry
;
1548 u64 node_stamp
; /* migration stamp */
1549 u64 last_task_numa_placement
;
1550 u64 last_sum_exec_runtime
;
1551 struct callback_head numa_work
;
1553 struct list_head numa_entry
;
1554 struct numa_group
*numa_group
;
1557 * Exponential decaying average of faults on a per-node basis.
1558 * Scheduling placement decisions are made based on the these counts.
1559 * The values remain static for the duration of a PTE scan
1561 unsigned long *numa_faults_memory
;
1562 unsigned long total_numa_faults
;
1565 * numa_faults_buffer records faults per node during the current
1566 * scan window. When the scan completes, the counts in
1567 * numa_faults_memory decay and these values are copied.
1569 unsigned long *numa_faults_buffer_memory
;
1572 * Track the nodes the process was running on when a NUMA hinting
1573 * fault was incurred.
1575 unsigned long *numa_faults_cpu
;
1576 unsigned long *numa_faults_buffer_cpu
;
1579 * numa_faults_locality tracks if faults recorded during the last
1580 * scan window were remote/local. The task scan period is adapted
1581 * based on the locality of the faults with different weights
1582 * depending on whether they were shared or private faults
1584 unsigned long numa_faults_locality
[2];
1586 unsigned long numa_pages_migrated
;
1587 #endif /* CONFIG_NUMA_BALANCING */
1589 struct rcu_head rcu
;
1592 * cache last used pipe for splice
1594 struct pipe_inode_info
*splice_pipe
;
1596 struct page_frag task_frag
;
1598 #ifdef CONFIG_TASK_DELAY_ACCT
1599 struct task_delay_info
*delays
;
1601 #ifdef CONFIG_FAULT_INJECTION
1605 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1606 * balance_dirty_pages() for some dirty throttling pause
1609 int nr_dirtied_pause
;
1610 unsigned long dirty_paused_when
; /* start of a write-and-pause period */
1612 #ifdef CONFIG_LATENCYTOP
1613 int latency_record_count
;
1614 struct latency_record latency_record
[LT_SAVECOUNT
];
1617 * time slack values; these are used to round up poll() and
1618 * select() etc timeout values. These are in nanoseconds.
1620 unsigned long timer_slack_ns
;
1621 unsigned long default_timer_slack_ns
;
1623 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1624 /* Index of current stored address in ret_stack */
1626 /* Stack of return addresses for return function tracing */
1627 struct ftrace_ret_stack
*ret_stack
;
1628 /* time stamp for last schedule */
1629 unsigned long long ftrace_timestamp
;
1631 * Number of functions that haven't been traced
1632 * because of depth overrun.
1634 atomic_t trace_overrun
;
1635 /* Pause for the tracing */
1636 atomic_t tracing_graph_pause
;
1638 #ifdef CONFIG_TRACING
1639 /* state flags for use by tracers */
1640 unsigned long trace
;
1641 /* bitmask and counter of trace recursion */
1642 unsigned long trace_recursion
;
1643 #endif /* CONFIG_TRACING */
1644 #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
1645 unsigned int memcg_kmem_skip_account
;
1646 struct memcg_oom_info
{
1647 struct mem_cgroup
*memcg
;
1650 unsigned int may_oom
:1;
1653 #ifdef CONFIG_UPROBES
1654 struct uprobe_task
*utask
;
1656 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1657 unsigned int sequential_io
;
1658 unsigned int sequential_io_avg
;
1662 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1663 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1665 #define TNF_MIGRATED 0x01
1666 #define TNF_NO_GROUP 0x02
1667 #define TNF_SHARED 0x04
1668 #define TNF_FAULT_LOCAL 0x08
1670 #ifdef CONFIG_NUMA_BALANCING
1671 extern void task_numa_fault(int last_node
, int node
, int pages
, int flags
);
1672 extern pid_t
task_numa_group_id(struct task_struct
*p
);
1673 extern void set_numabalancing_state(bool enabled
);
1674 extern void task_numa_free(struct task_struct
*p
);
1675 extern bool should_numa_migrate_memory(struct task_struct
*p
, struct page
*page
,
1676 int src_nid
, int dst_cpu
);
1678 static inline void task_numa_fault(int last_node
, int node
, int pages
,
1682 static inline pid_t
task_numa_group_id(struct task_struct
*p
)
1686 static inline void set_numabalancing_state(bool enabled
)
1689 static inline void task_numa_free(struct task_struct
*p
)
1692 static inline bool should_numa_migrate_memory(struct task_struct
*p
,
1693 struct page
*page
, int src_nid
, int dst_cpu
)
1699 static inline struct pid
*task_pid(struct task_struct
*task
)
1701 return task
->pids
[PIDTYPE_PID
].pid
;
1704 static inline struct pid
*task_tgid(struct task_struct
*task
)
1706 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1710 * Without tasklist or rcu lock it is not safe to dereference
1711 * the result of task_pgrp/task_session even if task == current,
1712 * we can race with another thread doing sys_setsid/sys_setpgid.
1714 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1716 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1719 static inline struct pid
*task_session(struct task_struct
*task
)
1721 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1724 struct pid_namespace
;
1727 * the helpers to get the task's different pids as they are seen
1728 * from various namespaces
1730 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1731 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1733 * task_xid_nr_ns() : id seen from the ns specified;
1735 * set_task_vxid() : assigns a virtual id to a task;
1737 * see also pid_nr() etc in include/linux/pid.h
1739 pid_t
__task_pid_nr_ns(struct task_struct
*task
, enum pid_type type
,
1740 struct pid_namespace
*ns
);
1742 static inline pid_t
task_pid_nr(struct task_struct
*tsk
)
1747 static inline pid_t
task_pid_nr_ns(struct task_struct
*tsk
,
1748 struct pid_namespace
*ns
)
1750 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, ns
);
1753 static inline pid_t
task_pid_vnr(struct task_struct
*tsk
)
1755 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, NULL
);
1759 static inline pid_t
task_tgid_nr(struct task_struct
*tsk
)
1764 pid_t
task_tgid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1766 static inline pid_t
task_tgid_vnr(struct task_struct
*tsk
)
1768 return pid_vnr(task_tgid(tsk
));
1772 static inline int pid_alive(const struct task_struct
*p
);
1773 static inline pid_t
task_ppid_nr_ns(const struct task_struct
*tsk
, struct pid_namespace
*ns
)
1779 pid
= task_tgid_nr_ns(rcu_dereference(tsk
->real_parent
), ns
);
1785 static inline pid_t
task_ppid_nr(const struct task_struct
*tsk
)
1787 return task_ppid_nr_ns(tsk
, &init_pid_ns
);
1790 static inline pid_t
task_pgrp_nr_ns(struct task_struct
*tsk
,
1791 struct pid_namespace
*ns
)
1793 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, ns
);
1796 static inline pid_t
task_pgrp_vnr(struct task_struct
*tsk
)
1798 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, NULL
);
1802 static inline pid_t
task_session_nr_ns(struct task_struct
*tsk
,
1803 struct pid_namespace
*ns
)
1805 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, ns
);
1808 static inline pid_t
task_session_vnr(struct task_struct
*tsk
)
1810 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, NULL
);
1813 /* obsolete, do not use */
1814 static inline pid_t
task_pgrp_nr(struct task_struct
*tsk
)
1816 return task_pgrp_nr_ns(tsk
, &init_pid_ns
);
1820 * pid_alive - check that a task structure is not stale
1821 * @p: Task structure to be checked.
1823 * Test if a process is not yet dead (at most zombie state)
1824 * If pid_alive fails, then pointers within the task structure
1825 * can be stale and must not be dereferenced.
1827 * Return: 1 if the process is alive. 0 otherwise.
1829 static inline int pid_alive(const struct task_struct
*p
)
1831 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1835 * is_global_init - check if a task structure is init
1836 * @tsk: Task structure to be checked.
1838 * Check if a task structure is the first user space task the kernel created.
1840 * Return: 1 if the task structure is init. 0 otherwise.
1842 static inline int is_global_init(struct task_struct
*tsk
)
1844 return tsk
->pid
== 1;
1847 extern struct pid
*cad_pid
;
1849 extern void free_task(struct task_struct
*tsk
);
1850 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1852 extern void __put_task_struct(struct task_struct
*t
);
1854 static inline void put_task_struct(struct task_struct
*t
)
1856 if (atomic_dec_and_test(&t
->usage
))
1857 __put_task_struct(t
);
1860 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1861 extern void task_cputime(struct task_struct
*t
,
1862 cputime_t
*utime
, cputime_t
*stime
);
1863 extern void task_cputime_scaled(struct task_struct
*t
,
1864 cputime_t
*utimescaled
, cputime_t
*stimescaled
);
1865 extern cputime_t
task_gtime(struct task_struct
*t
);
1867 static inline void task_cputime(struct task_struct
*t
,
1868 cputime_t
*utime
, cputime_t
*stime
)
1876 static inline void task_cputime_scaled(struct task_struct
*t
,
1877 cputime_t
*utimescaled
,
1878 cputime_t
*stimescaled
)
1881 *utimescaled
= t
->utimescaled
;
1883 *stimescaled
= t
->stimescaled
;
1886 static inline cputime_t
task_gtime(struct task_struct
*t
)
1891 extern void task_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
1892 extern void thread_group_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
1897 #define PF_EXITING 0x00000004 /* getting shut down */
1898 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1899 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1900 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1901 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1902 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1903 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1904 #define PF_DUMPCORE 0x00000200 /* dumped core */
1905 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1906 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1907 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1908 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1909 #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */
1910 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1911 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1912 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1913 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1914 #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */
1915 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1916 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1917 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1918 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1919 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1920 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1921 #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */
1922 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1923 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1924 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1925 #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */
1928 * Only the _current_ task can read/write to tsk->flags, but other
1929 * tasks can access tsk->flags in readonly mode for example
1930 * with tsk_used_math (like during threaded core dumping).
1931 * There is however an exception to this rule during ptrace
1932 * or during fork: the ptracer task is allowed to write to the
1933 * child->flags of its traced child (same goes for fork, the parent
1934 * can write to the child->flags), because we're guaranteed the
1935 * child is not running and in turn not changing child->flags
1936 * at the same time the parent does it.
1938 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1939 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1940 #define clear_used_math() clear_stopped_child_used_math(current)
1941 #define set_used_math() set_stopped_child_used_math(current)
1942 #define conditional_stopped_child_used_math(condition, child) \
1943 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1944 #define conditional_used_math(condition) \
1945 conditional_stopped_child_used_math(condition, current)
1946 #define copy_to_stopped_child_used_math(child) \
1947 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1948 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1949 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1950 #define used_math() tsk_used_math(current)
1952 /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags */
1953 static inline gfp_t
memalloc_noio_flags(gfp_t flags
)
1955 if (unlikely(current
->flags
& PF_MEMALLOC_NOIO
))
1960 static inline unsigned int memalloc_noio_save(void)
1962 unsigned int flags
= current
->flags
& PF_MEMALLOC_NOIO
;
1963 current
->flags
|= PF_MEMALLOC_NOIO
;
1967 static inline void memalloc_noio_restore(unsigned int flags
)
1969 current
->flags
= (current
->flags
& ~PF_MEMALLOC_NOIO
) | flags
;
1972 /* Per-process atomic flags. */
1973 #define PFA_NO_NEW_PRIVS 0x00000001 /* May not gain new privileges. */
1975 static inline bool task_no_new_privs(struct task_struct
*p
)
1977 return test_bit(PFA_NO_NEW_PRIVS
, &p
->atomic_flags
);
1980 static inline void task_set_no_new_privs(struct task_struct
*p
)
1982 set_bit(PFA_NO_NEW_PRIVS
, &p
->atomic_flags
);
1986 * task->jobctl flags
1988 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1990 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1991 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1992 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1993 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1994 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1995 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1996 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1998 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1999 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
2000 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
2001 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
2002 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
2003 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
2004 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
2006 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
2007 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
2009 extern bool task_set_jobctl_pending(struct task_struct
*task
,
2011 extern void task_clear_jobctl_trapping(struct task_struct
*task
);
2012 extern void task_clear_jobctl_pending(struct task_struct
*task
,
2015 static inline void rcu_copy_process(struct task_struct
*p
)
2017 #ifdef CONFIG_PREEMPT_RCU
2018 p
->rcu_read_lock_nesting
= 0;
2019 p
->rcu_read_unlock_special
.s
= 0;
2020 p
->rcu_blocked_node
= NULL
;
2021 INIT_LIST_HEAD(&p
->rcu_node_entry
);
2022 #endif /* #ifdef CONFIG_PREEMPT_RCU */
2023 #ifdef CONFIG_TASKS_RCU
2024 p
->rcu_tasks_holdout
= false;
2025 INIT_LIST_HEAD(&p
->rcu_tasks_holdout_list
);
2026 p
->rcu_tasks_idle_cpu
= -1;
2027 #endif /* #ifdef CONFIG_TASKS_RCU */
2030 static inline void tsk_restore_flags(struct task_struct
*task
,
2031 unsigned long orig_flags
, unsigned long flags
)
2033 task
->flags
&= ~flags
;
2034 task
->flags
|= orig_flags
& flags
;
2038 extern void do_set_cpus_allowed(struct task_struct
*p
,
2039 const struct cpumask
*new_mask
);
2041 extern int set_cpus_allowed_ptr(struct task_struct
*p
,
2042 const struct cpumask
*new_mask
);
2044 static inline void do_set_cpus_allowed(struct task_struct
*p
,
2045 const struct cpumask
*new_mask
)
2048 static inline int set_cpus_allowed_ptr(struct task_struct
*p
,
2049 const struct cpumask
*new_mask
)
2051 if (!cpumask_test_cpu(0, new_mask
))
2057 #ifdef CONFIG_NO_HZ_COMMON
2058 void calc_load_enter_idle(void);
2059 void calc_load_exit_idle(void);
2061 static inline void calc_load_enter_idle(void) { }
2062 static inline void calc_load_exit_idle(void) { }
2063 #endif /* CONFIG_NO_HZ_COMMON */
2065 #ifndef CONFIG_CPUMASK_OFFSTACK
2066 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
2068 return set_cpus_allowed_ptr(p
, &new_mask
);
2073 * Do not use outside of architecture code which knows its limitations.
2075 * sched_clock() has no promise of monotonicity or bounded drift between
2076 * CPUs, use (which you should not) requires disabling IRQs.
2078 * Please use one of the three interfaces below.
2080 extern unsigned long long notrace
sched_clock(void);
2082 * See the comment in kernel/sched/clock.c
2084 extern u64
cpu_clock(int cpu
);
2085 extern u64
local_clock(void);
2086 extern u64
sched_clock_cpu(int cpu
);
2089 extern void sched_clock_init(void);
2091 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
2092 static inline void sched_clock_tick(void)
2096 static inline void sched_clock_idle_sleep_event(void)
2100 static inline void sched_clock_idle_wakeup_event(u64 delta_ns
)
2105 * Architectures can set this to 1 if they have specified
2106 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
2107 * but then during bootup it turns out that sched_clock()
2108 * is reliable after all:
2110 extern int sched_clock_stable(void);
2111 extern void set_sched_clock_stable(void);
2112 extern void clear_sched_clock_stable(void);
2114 extern void sched_clock_tick(void);
2115 extern void sched_clock_idle_sleep_event(void);
2116 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
2119 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
2121 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
2122 * The reason for this explicit opt-in is not to have perf penalty with
2123 * slow sched_clocks.
2125 extern void enable_sched_clock_irqtime(void);
2126 extern void disable_sched_clock_irqtime(void);
2128 static inline void enable_sched_clock_irqtime(void) {}
2129 static inline void disable_sched_clock_irqtime(void) {}
2132 extern unsigned long long
2133 task_sched_runtime(struct task_struct
*task
);
2135 /* sched_exec is called by processes performing an exec */
2137 extern void sched_exec(void);
2139 #define sched_exec() {}
2142 extern void sched_clock_idle_sleep_event(void);
2143 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
2145 #ifdef CONFIG_HOTPLUG_CPU
2146 extern void idle_task_exit(void);
2148 static inline void idle_task_exit(void) {}
2151 #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
2152 extern void wake_up_nohz_cpu(int cpu
);
2154 static inline void wake_up_nohz_cpu(int cpu
) { }
2157 #ifdef CONFIG_NO_HZ_FULL
2158 extern bool sched_can_stop_tick(void);
2159 extern u64
scheduler_tick_max_deferment(void);
2161 static inline bool sched_can_stop_tick(void) { return false; }
2164 #ifdef CONFIG_SCHED_AUTOGROUP
2165 extern void sched_autogroup_create_attach(struct task_struct
*p
);
2166 extern void sched_autogroup_detach(struct task_struct
*p
);
2167 extern void sched_autogroup_fork(struct signal_struct
*sig
);
2168 extern void sched_autogroup_exit(struct signal_struct
*sig
);
2169 #ifdef CONFIG_PROC_FS
2170 extern void proc_sched_autogroup_show_task(struct task_struct
*p
, struct seq_file
*m
);
2171 extern int proc_sched_autogroup_set_nice(struct task_struct
*p
, int nice
);
2174 static inline void sched_autogroup_create_attach(struct task_struct
*p
) { }
2175 static inline void sched_autogroup_detach(struct task_struct
*p
) { }
2176 static inline void sched_autogroup_fork(struct signal_struct
*sig
) { }
2177 static inline void sched_autogroup_exit(struct signal_struct
*sig
) { }
2180 extern int yield_to(struct task_struct
*p
, bool preempt
);
2181 extern void set_user_nice(struct task_struct
*p
, long nice
);
2182 extern int task_prio(const struct task_struct
*p
);
2184 * task_nice - return the nice value of a given task.
2185 * @p: the task in question.
2187 * Return: The nice value [ -20 ... 0 ... 19 ].
2189 static inline int task_nice(const struct task_struct
*p
)
2191 return PRIO_TO_NICE((p
)->static_prio
);
2193 extern int can_nice(const struct task_struct
*p
, const int nice
);
2194 extern int task_curr(const struct task_struct
*p
);
2195 extern int idle_cpu(int cpu
);
2196 extern int sched_setscheduler(struct task_struct
*, int,
2197 const struct sched_param
*);
2198 extern int sched_setscheduler_nocheck(struct task_struct
*, int,
2199 const struct sched_param
*);
2200 extern int sched_setattr(struct task_struct
*,
2201 const struct sched_attr
*);
2202 extern struct task_struct
*idle_task(int cpu
);
2204 * is_idle_task - is the specified task an idle task?
2205 * @p: the task in question.
2207 * Return: 1 if @p is an idle task. 0 otherwise.
2209 static inline bool is_idle_task(const struct task_struct
*p
)
2213 extern struct task_struct
*curr_task(int cpu
);
2214 extern void set_curr_task(int cpu
, struct task_struct
*p
);
2219 * The default (Linux) execution domain.
2221 extern struct exec_domain default_exec_domain
;
2223 union thread_union
{
2224 struct thread_info thread_info
;
2225 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
2228 #ifndef __HAVE_ARCH_KSTACK_END
2229 static inline int kstack_end(void *addr
)
2231 /* Reliable end of stack detection:
2232 * Some APM bios versions misalign the stack
2234 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
2238 extern union thread_union init_thread_union
;
2239 extern struct task_struct init_task
;
2241 extern struct mm_struct init_mm
;
2243 extern struct pid_namespace init_pid_ns
;
2246 * find a task by one of its numerical ids
2248 * find_task_by_pid_ns():
2249 * finds a task by its pid in the specified namespace
2250 * find_task_by_vpid():
2251 * finds a task by its virtual pid
2253 * see also find_vpid() etc in include/linux/pid.h
2256 extern struct task_struct
*find_task_by_vpid(pid_t nr
);
2257 extern struct task_struct
*find_task_by_pid_ns(pid_t nr
,
2258 struct pid_namespace
*ns
);
2260 /* per-UID process charging. */
2261 extern struct user_struct
* alloc_uid(kuid_t
);
2262 static inline struct user_struct
*get_uid(struct user_struct
*u
)
2264 atomic_inc(&u
->__count
);
2267 extern void free_uid(struct user_struct
*);
2269 #include <asm/current.h>
2271 extern void xtime_update(unsigned long ticks
);
2273 extern int wake_up_state(struct task_struct
*tsk
, unsigned int state
);
2274 extern int wake_up_process(struct task_struct
*tsk
);
2275 extern void wake_up_new_task(struct task_struct
*tsk
);
2277 extern void kick_process(struct task_struct
*tsk
);
2279 static inline void kick_process(struct task_struct
*tsk
) { }
2281 extern int sched_fork(unsigned long clone_flags
, struct task_struct
*p
);
2282 extern void sched_dead(struct task_struct
*p
);
2284 extern void proc_caches_init(void);
2285 extern void flush_signals(struct task_struct
*);
2286 extern void __flush_signals(struct task_struct
*);
2287 extern void ignore_signals(struct task_struct
*);
2288 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
2289 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
2291 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
2293 unsigned long flags
;
2296 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
2297 ret
= dequeue_signal(tsk
, mask
, info
);
2298 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
2303 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
2305 extern void unblock_all_signals(void);
2306 extern void release_task(struct task_struct
* p
);
2307 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
2308 extern int force_sigsegv(int, struct task_struct
*);
2309 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
2310 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
2311 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
2312 extern int kill_pid_info_as_cred(int, struct siginfo
*, struct pid
*,
2313 const struct cred
*, u32
);
2314 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
2315 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
2316 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
2317 extern __must_check
bool do_notify_parent(struct task_struct
*, int);
2318 extern void __wake_up_parent(struct task_struct
*p
, struct task_struct
*parent
);
2319 extern void force_sig(int, struct task_struct
*);
2320 extern int send_sig(int, struct task_struct
*, int);
2321 extern int zap_other_threads(struct task_struct
*p
);
2322 extern struct sigqueue
*sigqueue_alloc(void);
2323 extern void sigqueue_free(struct sigqueue
*);
2324 extern int send_sigqueue(struct sigqueue
*, struct task_struct
*, int group
);
2325 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
2327 static inline void restore_saved_sigmask(void)
2329 if (test_and_clear_restore_sigmask())
2330 __set_current_blocked(¤t
->saved_sigmask
);
2333 static inline sigset_t
*sigmask_to_save(void)
2335 sigset_t
*res
= ¤t
->blocked
;
2336 if (unlikely(test_restore_sigmask()))
2337 res
= ¤t
->saved_sigmask
;
2341 static inline int kill_cad_pid(int sig
, int priv
)
2343 return kill_pid(cad_pid
, sig
, priv
);
2346 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2347 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2348 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2349 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2352 * True if we are on the alternate signal stack.
2354 static inline int on_sig_stack(unsigned long sp
)
2356 #ifdef CONFIG_STACK_GROWSUP
2357 return sp
>= current
->sas_ss_sp
&&
2358 sp
- current
->sas_ss_sp
< current
->sas_ss_size
;
2360 return sp
> current
->sas_ss_sp
&&
2361 sp
- current
->sas_ss_sp
<= current
->sas_ss_size
;
2365 static inline int sas_ss_flags(unsigned long sp
)
2367 if (!current
->sas_ss_size
)
2370 return on_sig_stack(sp
) ? SS_ONSTACK
: 0;
2373 static inline unsigned long sigsp(unsigned long sp
, struct ksignal
*ksig
)
2375 if (unlikely((ksig
->ka
.sa
.sa_flags
& SA_ONSTACK
)) && ! sas_ss_flags(sp
))
2376 #ifdef CONFIG_STACK_GROWSUP
2377 return current
->sas_ss_sp
;
2379 return current
->sas_ss_sp
+ current
->sas_ss_size
;
2385 * Routines for handling mm_structs
2387 extern struct mm_struct
* mm_alloc(void);
2389 /* mmdrop drops the mm and the page tables */
2390 extern void __mmdrop(struct mm_struct
*);
2391 static inline void mmdrop(struct mm_struct
* mm
)
2393 if (unlikely(atomic_dec_and_test(&mm
->mm_count
)))
2397 /* mmput gets rid of the mappings and all user-space */
2398 extern void mmput(struct mm_struct
*);
2399 /* Grab a reference to a task's mm, if it is not already going away */
2400 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
2402 * Grab a reference to a task's mm, if it is not already going away
2403 * and ptrace_may_access with the mode parameter passed to it
2406 extern struct mm_struct
*mm_access(struct task_struct
*task
, unsigned int mode
);
2407 /* Remove the current tasks stale references to the old mm_struct */
2408 extern void mm_release(struct task_struct
*, struct mm_struct
*);
2410 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2411 struct task_struct
*);
2412 extern void flush_thread(void);
2413 extern void exit_thread(void);
2415 extern void exit_files(struct task_struct
*);
2416 extern void __cleanup_sighand(struct sighand_struct
*);
2418 extern void exit_itimers(struct signal_struct
*);
2419 extern void flush_itimer_signals(void);
2421 extern void do_group_exit(int);
2423 extern int do_execve(struct filename
*,
2424 const char __user
* const __user
*,
2425 const char __user
* const __user
*);
2426 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user
*, int __user
*);
2427 struct task_struct
*fork_idle(int);
2428 extern pid_t
kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
);
2430 extern void __set_task_comm(struct task_struct
*tsk
, const char *from
, bool exec
);
2431 static inline void set_task_comm(struct task_struct
*tsk
, const char *from
)
2433 __set_task_comm(tsk
, from
, false);
2435 extern char *get_task_comm(char *to
, struct task_struct
*tsk
);
2438 void scheduler_ipi(void);
2439 extern unsigned long wait_task_inactive(struct task_struct
*, long match_state
);
2441 static inline void scheduler_ipi(void) { }
2442 static inline unsigned long wait_task_inactive(struct task_struct
*p
,
2449 #define next_task(p) \
2450 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2452 #define for_each_process(p) \
2453 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2455 extern bool current_is_single_threaded(void);
2458 * Careful: do_each_thread/while_each_thread is a double loop so
2459 * 'break' will not work as expected - use goto instead.
2461 #define do_each_thread(g, t) \
2462 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2464 #define while_each_thread(g, t) \
2465 while ((t = next_thread(t)) != g)
2467 #define __for_each_thread(signal, t) \
2468 list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
2470 #define for_each_thread(p, t) \
2471 __for_each_thread((p)->signal, t)
2473 /* Careful: this is a double loop, 'break' won't work as expected. */
2474 #define for_each_process_thread(p, t) \
2475 for_each_process(p) for_each_thread(p, t)
2477 static inline int get_nr_threads(struct task_struct
*tsk
)
2479 return tsk
->signal
->nr_threads
;
2482 static inline bool thread_group_leader(struct task_struct
*p
)
2484 return p
->exit_signal
>= 0;
2487 /* Do to the insanities of de_thread it is possible for a process
2488 * to have the pid of the thread group leader without actually being
2489 * the thread group leader. For iteration through the pids in proc
2490 * all we care about is that we have a task with the appropriate
2491 * pid, we don't actually care if we have the right task.
2493 static inline bool has_group_leader_pid(struct task_struct
*p
)
2495 return task_pid(p
) == p
->signal
->leader_pid
;
2499 bool same_thread_group(struct task_struct
*p1
, struct task_struct
*p2
)
2501 return p1
->signal
== p2
->signal
;
2504 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
2506 return list_entry_rcu(p
->thread_group
.next
,
2507 struct task_struct
, thread_group
);
2510 static inline int thread_group_empty(struct task_struct
*p
)
2512 return list_empty(&p
->thread_group
);
2515 #define delay_group_leader(p) \
2516 (thread_group_leader(p) && !thread_group_empty(p))
2519 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2520 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2521 * pins the final release of task.io_context. Also protects ->cpuset and
2522 * ->cgroup.subsys[]. And ->vfork_done.
2524 * Nests both inside and outside of read_lock(&tasklist_lock).
2525 * It must not be nested with write_lock_irq(&tasklist_lock),
2526 * neither inside nor outside.
2528 static inline void task_lock(struct task_struct
*p
)
2530 spin_lock(&p
->alloc_lock
);
2533 static inline void task_unlock(struct task_struct
*p
)
2535 spin_unlock(&p
->alloc_lock
);
2538 extern struct sighand_struct
*__lock_task_sighand(struct task_struct
*tsk
,
2539 unsigned long *flags
);
2541 static inline struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
2542 unsigned long *flags
)
2544 struct sighand_struct
*ret
;
2546 ret
= __lock_task_sighand(tsk
, flags
);
2547 (void)__cond_lock(&tsk
->sighand
->siglock
, ret
);
2551 static inline void unlock_task_sighand(struct task_struct
*tsk
,
2552 unsigned long *flags
)
2554 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
2557 #ifdef CONFIG_CGROUPS
2558 static inline void threadgroup_change_begin(struct task_struct
*tsk
)
2560 down_read(&tsk
->signal
->group_rwsem
);
2562 static inline void threadgroup_change_end(struct task_struct
*tsk
)
2564 up_read(&tsk
->signal
->group_rwsem
);
2568 * threadgroup_lock - lock threadgroup
2569 * @tsk: member task of the threadgroup to lock
2571 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2572 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2573 * change ->group_leader/pid. This is useful for cases where the threadgroup
2574 * needs to stay stable across blockable operations.
2576 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2577 * synchronization. While held, no new task will be added to threadgroup
2578 * and no existing live task will have its PF_EXITING set.
2580 * de_thread() does threadgroup_change_{begin|end}() when a non-leader
2581 * sub-thread becomes a new leader.
2583 static inline void threadgroup_lock(struct task_struct
*tsk
)
2585 down_write(&tsk
->signal
->group_rwsem
);
2589 * threadgroup_unlock - unlock threadgroup
2590 * @tsk: member task of the threadgroup to unlock
2592 * Reverse threadgroup_lock().
2594 static inline void threadgroup_unlock(struct task_struct
*tsk
)
2596 up_write(&tsk
->signal
->group_rwsem
);
2599 static inline void threadgroup_change_begin(struct task_struct
*tsk
) {}
2600 static inline void threadgroup_change_end(struct task_struct
*tsk
) {}
2601 static inline void threadgroup_lock(struct task_struct
*tsk
) {}
2602 static inline void threadgroup_unlock(struct task_struct
*tsk
) {}
2605 #ifndef __HAVE_THREAD_FUNCTIONS
2607 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2608 #define task_stack_page(task) ((task)->stack)
2610 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
2612 *task_thread_info(p
) = *task_thread_info(org
);
2613 task_thread_info(p
)->task
= p
;
2616 static inline unsigned long *end_of_stack(struct task_struct
*p
)
2618 return (unsigned long *)(task_thread_info(p
) + 1);
2623 static inline int object_is_on_stack(void *obj
)
2625 void *stack
= task_stack_page(current
);
2627 return (obj
>= stack
) && (obj
< (stack
+ THREAD_SIZE
));
2630 extern void thread_info_cache_init(void);
2632 #ifdef CONFIG_DEBUG_STACK_USAGE
2633 static inline unsigned long stack_not_used(struct task_struct
*p
)
2635 unsigned long *n
= end_of_stack(p
);
2637 do { /* Skip over canary */
2641 return (unsigned long)n
- (unsigned long)end_of_stack(p
);
2645 /* set thread flags in other task's structures
2646 * - see asm/thread_info.h for TIF_xxxx flags available
2648 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2650 set_ti_thread_flag(task_thread_info(tsk
), flag
);
2653 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2655 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2658 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2660 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
2663 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2665 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2668 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2670 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
2673 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
2675 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2678 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
2680 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2683 static inline int test_tsk_need_resched(struct task_struct
*tsk
)
2685 return unlikely(test_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
));
2688 static inline int restart_syscall(void)
2690 set_tsk_thread_flag(current
, TIF_SIGPENDING
);
2691 return -ERESTARTNOINTR
;
2694 static inline int signal_pending(struct task_struct
*p
)
2696 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
2699 static inline int __fatal_signal_pending(struct task_struct
*p
)
2701 return unlikely(sigismember(&p
->pending
.signal
, SIGKILL
));
2704 static inline int fatal_signal_pending(struct task_struct
*p
)
2706 return signal_pending(p
) && __fatal_signal_pending(p
);
2709 static inline int signal_pending_state(long state
, struct task_struct
*p
)
2711 if (!(state
& (TASK_INTERRUPTIBLE
| TASK_WAKEKILL
)))
2713 if (!signal_pending(p
))
2716 return (state
& TASK_INTERRUPTIBLE
) || __fatal_signal_pending(p
);
2720 * cond_resched() and cond_resched_lock(): latency reduction via
2721 * explicit rescheduling in places that are safe. The return
2722 * value indicates whether a reschedule was done in fact.
2723 * cond_resched_lock() will drop the spinlock before scheduling,
2724 * cond_resched_softirq() will enable bhs before scheduling.
2726 extern int _cond_resched(void);
2728 #define cond_resched() ({ \
2729 __might_sleep(__FILE__, __LINE__, 0); \
2733 extern int __cond_resched_lock(spinlock_t
*lock
);
2735 #ifdef CONFIG_PREEMPT_COUNT
2736 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2738 #define PREEMPT_LOCK_OFFSET 0
2741 #define cond_resched_lock(lock) ({ \
2742 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2743 __cond_resched_lock(lock); \
2746 extern int __cond_resched_softirq(void);
2748 #define cond_resched_softirq() ({ \
2749 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2750 __cond_resched_softirq(); \
2753 static inline void cond_resched_rcu(void)
2755 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
2763 * Does a critical section need to be broken due to another
2764 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2765 * but a general need for low latency)
2767 static inline int spin_needbreak(spinlock_t
*lock
)
2769 #ifdef CONFIG_PREEMPT
2770 return spin_is_contended(lock
);
2777 * Idle thread specific functions to determine the need_resched
2780 #ifdef TIF_POLLING_NRFLAG
2781 static inline int tsk_is_polling(struct task_struct
*p
)
2783 return test_tsk_thread_flag(p
, TIF_POLLING_NRFLAG
);
2786 static inline void __current_set_polling(void)
2788 set_thread_flag(TIF_POLLING_NRFLAG
);
2791 static inline bool __must_check
current_set_polling_and_test(void)
2793 __current_set_polling();
2796 * Polling state must be visible before we test NEED_RESCHED,
2797 * paired by resched_curr()
2799 smp_mb__after_atomic();
2801 return unlikely(tif_need_resched());
2804 static inline void __current_clr_polling(void)
2806 clear_thread_flag(TIF_POLLING_NRFLAG
);
2809 static inline bool __must_check
current_clr_polling_and_test(void)
2811 __current_clr_polling();
2814 * Polling state must be visible before we test NEED_RESCHED,
2815 * paired by resched_curr()
2817 smp_mb__after_atomic();
2819 return unlikely(tif_need_resched());
2823 static inline int tsk_is_polling(struct task_struct
*p
) { return 0; }
2824 static inline void __current_set_polling(void) { }
2825 static inline void __current_clr_polling(void) { }
2827 static inline bool __must_check
current_set_polling_and_test(void)
2829 return unlikely(tif_need_resched());
2831 static inline bool __must_check
current_clr_polling_and_test(void)
2833 return unlikely(tif_need_resched());
2837 static inline void current_clr_polling(void)
2839 __current_clr_polling();
2842 * Ensure we check TIF_NEED_RESCHED after we clear the polling bit.
2843 * Once the bit is cleared, we'll get IPIs with every new
2844 * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also
2847 smp_mb(); /* paired with resched_curr() */
2849 preempt_fold_need_resched();
2852 static __always_inline
bool need_resched(void)
2854 return unlikely(tif_need_resched());
2858 * Thread group CPU time accounting.
2860 void thread_group_cputime(struct task_struct
*tsk
, struct task_cputime
*times
);
2861 void thread_group_cputimer(struct task_struct
*tsk
, struct task_cputime
*times
);
2863 static inline void thread_group_cputime_init(struct signal_struct
*sig
)
2865 raw_spin_lock_init(&sig
->cputimer
.lock
);
2869 * Reevaluate whether the task has signals pending delivery.
2870 * Wake the task if so.
2871 * This is required every time the blocked sigset_t changes.
2872 * callers must hold sighand->siglock.
2874 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
2875 extern void recalc_sigpending(void);
2877 extern void signal_wake_up_state(struct task_struct
*t
, unsigned int state
);
2879 static inline void signal_wake_up(struct task_struct
*t
, bool resume
)
2881 signal_wake_up_state(t
, resume
? TASK_WAKEKILL
: 0);
2883 static inline void ptrace_signal_wake_up(struct task_struct
*t
, bool resume
)
2885 signal_wake_up_state(t
, resume
? __TASK_TRACED
: 0);
2889 * Wrappers for p->thread_info->cpu access. No-op on UP.
2893 static inline unsigned int task_cpu(const struct task_struct
*p
)
2895 return task_thread_info(p
)->cpu
;
2898 static inline int task_node(const struct task_struct
*p
)
2900 return cpu_to_node(task_cpu(p
));
2903 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
2907 static inline unsigned int task_cpu(const struct task_struct
*p
)
2912 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
2916 #endif /* CONFIG_SMP */
2918 extern long sched_setaffinity(pid_t pid
, const struct cpumask
*new_mask
);
2919 extern long sched_getaffinity(pid_t pid
, struct cpumask
*mask
);
2921 #ifdef CONFIG_CGROUP_SCHED
2922 extern struct task_group root_task_group
;
2923 #endif /* CONFIG_CGROUP_SCHED */
2925 extern int task_can_switch_user(struct user_struct
*up
,
2926 struct task_struct
*tsk
);
2928 #ifdef CONFIG_TASK_XACCT
2929 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2931 tsk
->ioac
.rchar
+= amt
;
2934 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2936 tsk
->ioac
.wchar
+= amt
;
2939 static inline void inc_syscr(struct task_struct
*tsk
)
2944 static inline void inc_syscw(struct task_struct
*tsk
)
2949 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2953 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2957 static inline void inc_syscr(struct task_struct
*tsk
)
2961 static inline void inc_syscw(struct task_struct
*tsk
)
2966 #ifndef TASK_SIZE_OF
2967 #define TASK_SIZE_OF(tsk) TASK_SIZE
2971 extern void mm_update_next_owner(struct mm_struct
*mm
);
2973 static inline void mm_update_next_owner(struct mm_struct
*mm
)
2976 #endif /* CONFIG_MEMCG */
2978 static inline unsigned long task_rlimit(const struct task_struct
*tsk
,
2981 return ACCESS_ONCE(tsk
->signal
->rlim
[limit
].rlim_cur
);
2984 static inline unsigned long task_rlimit_max(const struct task_struct
*tsk
,
2987 return ACCESS_ONCE(tsk
->signal
->rlim
[limit
].rlim_max
);
2990 static inline unsigned long rlimit(unsigned int limit
)
2992 return task_rlimit(current
, limit
);
2995 static inline unsigned long rlimit_max(unsigned int limit
)
2997 return task_rlimit_max(current
, limit
);