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.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>
60 #include <linux/magic.h>
61 #include <linux/cgroup-defs.h>
63 #include <asm/processor.h>
65 #define SCHED_ATTR_SIZE_VER0 48 /* sizeof first published struct */
68 * Extended scheduling parameters data structure.
70 * This is needed because the original struct sched_param can not be
71 * altered without introducing ABI issues with legacy applications
72 * (e.g., in sched_getparam()).
74 * However, the possibility of specifying more than just a priority for
75 * the tasks may be useful for a wide variety of application fields, e.g.,
76 * multimedia, streaming, automation and control, and many others.
78 * This variant (sched_attr) is meant at describing a so-called
79 * sporadic time-constrained task. In such model a task is specified by:
80 * - the activation period or minimum instance inter-arrival time;
81 * - the maximum (or average, depending on the actual scheduling
82 * discipline) computation time of all instances, a.k.a. runtime;
83 * - the deadline (relative to the actual activation time) of each
85 * Very briefly, a periodic (sporadic) task asks for the execution of
86 * some specific computation --which is typically called an instance--
87 * (at most) every period. Moreover, each instance typically lasts no more
88 * than the runtime and must be completed by time instant t equal to
89 * the instance activation time + the deadline.
91 * This is reflected by the actual fields of the sched_attr structure:
93 * @size size of the structure, for fwd/bwd compat.
95 * @sched_policy task's scheduling policy
96 * @sched_flags for customizing the scheduler behaviour
97 * @sched_nice task's nice value (SCHED_NORMAL/BATCH)
98 * @sched_priority task's static priority (SCHED_FIFO/RR)
99 * @sched_deadline representative of the task's deadline
100 * @sched_runtime representative of the task's runtime
101 * @sched_period representative of the task's period
103 * Given this task model, there are a multiplicity of scheduling algorithms
104 * and policies, that can be used to ensure all the tasks will make their
105 * timing constraints.
107 * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the
108 * only user of this new interface. More information about the algorithm
109 * available in the scheduling class file or in Documentation/.
117 /* SCHED_NORMAL, SCHED_BATCH */
120 /* SCHED_FIFO, SCHED_RR */
129 struct futex_pi_state
;
130 struct robust_list_head
;
133 struct perf_event_context
;
138 #define VMACACHE_BITS 2
139 #define VMACACHE_SIZE (1U << VMACACHE_BITS)
140 #define VMACACHE_MASK (VMACACHE_SIZE - 1)
143 * These are the constant used to fake the fixed-point load-average
144 * counting. Some notes:
145 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
146 * a load-average precision of 10 bits integer + 11 bits fractional
147 * - if you want to count load-averages more often, you need more
148 * precision, or rounding will get you. With 2-second counting freq,
149 * the EXP_n values would be 1981, 2034 and 2043 if still using only
152 extern unsigned long avenrun
[]; /* Load averages */
153 extern void get_avenrun(unsigned long *loads
, unsigned long offset
, int shift
);
155 #define FSHIFT 11 /* nr of bits of precision */
156 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
157 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
158 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
159 #define EXP_5 2014 /* 1/exp(5sec/5min) */
160 #define EXP_15 2037 /* 1/exp(5sec/15min) */
162 #define CALC_LOAD(load,exp,n) \
164 load += n*(FIXED_1-exp); \
167 extern unsigned long total_forks
;
168 extern int nr_threads
;
169 DECLARE_PER_CPU(unsigned long, process_counts
);
170 extern int nr_processes(void);
171 extern unsigned long nr_running(void);
172 extern bool single_task_running(void);
173 extern unsigned long nr_iowait(void);
174 extern unsigned long nr_iowait_cpu(int cpu
);
175 extern void get_iowait_load(unsigned long *nr_waiters
, unsigned long *load
);
177 extern void calc_global_load(unsigned long ticks
);
179 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
180 extern void update_cpu_load_nohz(void);
182 static inline void update_cpu_load_nohz(void) { }
185 extern unsigned long get_parent_ip(unsigned long addr
);
187 extern void dump_cpu_task(int cpu
);
192 #ifdef CONFIG_SCHED_DEBUG
193 extern void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
);
194 extern void proc_sched_set_task(struct task_struct
*p
);
198 * Task state bitmask. NOTE! These bits are also
199 * encoded in fs/proc/array.c: get_task_state().
201 * We have two separate sets of flags: task->state
202 * is about runnability, while task->exit_state are
203 * about the task exiting. Confusing, but this way
204 * modifying one set can't modify the other one by
207 #define TASK_RUNNING 0
208 #define TASK_INTERRUPTIBLE 1
209 #define TASK_UNINTERRUPTIBLE 2
210 #define __TASK_STOPPED 4
211 #define __TASK_TRACED 8
212 /* in tsk->exit_state */
214 #define EXIT_ZOMBIE 32
215 #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
216 /* in tsk->state again */
218 #define TASK_WAKEKILL 128
219 #define TASK_WAKING 256
220 #define TASK_PARKED 512
221 #define TASK_NOLOAD 1024
222 #define TASK_STATE_MAX 2048
224 #define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPN"
226 extern char ___assert_task_state
[1 - 2*!!(
227 sizeof(TASK_STATE_TO_CHAR_STR
)-1 != ilog2(TASK_STATE_MAX
)+1)];
229 /* Convenience macros for the sake of set_task_state */
230 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
231 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
232 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
234 #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD)
236 /* Convenience macros for the sake of wake_up */
237 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
238 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
240 /* get_task_state() */
241 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
242 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
243 __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD)
245 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
246 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
247 #define task_is_stopped_or_traced(task) \
248 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
249 #define task_contributes_to_load(task) \
250 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
251 (task->flags & PF_FROZEN) == 0 && \
252 (task->state & TASK_NOLOAD) == 0)
254 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
256 #define __set_task_state(tsk, state_value) \
258 (tsk)->task_state_change = _THIS_IP_; \
259 (tsk)->state = (state_value); \
261 #define set_task_state(tsk, state_value) \
263 (tsk)->task_state_change = _THIS_IP_; \
264 smp_store_mb((tsk)->state, (state_value)); \
268 * set_current_state() includes a barrier so that the write of current->state
269 * is correctly serialised wrt the caller's subsequent test of whether to
272 * set_current_state(TASK_UNINTERRUPTIBLE);
273 * if (do_i_need_to_sleep())
276 * If the caller does not need such serialisation then use __set_current_state()
278 #define __set_current_state(state_value) \
280 current->task_state_change = _THIS_IP_; \
281 current->state = (state_value); \
283 #define set_current_state(state_value) \
285 current->task_state_change = _THIS_IP_; \
286 smp_store_mb(current->state, (state_value)); \
291 #define __set_task_state(tsk, state_value) \
292 do { (tsk)->state = (state_value); } while (0)
293 #define set_task_state(tsk, state_value) \
294 smp_store_mb((tsk)->state, (state_value))
297 * set_current_state() includes a barrier so that the write of current->state
298 * is correctly serialised wrt the caller's subsequent test of whether to
301 * set_current_state(TASK_UNINTERRUPTIBLE);
302 * if (do_i_need_to_sleep())
305 * If the caller does not need such serialisation then use __set_current_state()
307 #define __set_current_state(state_value) \
308 do { current->state = (state_value); } while (0)
309 #define set_current_state(state_value) \
310 smp_store_mb(current->state, (state_value))
314 /* Task command name length */
315 #define TASK_COMM_LEN 16
317 #include <linux/spinlock.h>
320 * This serializes "schedule()" and also protects
321 * the run-queue from deletions/modifications (but
322 * _adding_ to the beginning of the run-queue has
325 extern rwlock_t tasklist_lock
;
326 extern spinlock_t mmlist_lock
;
330 #ifdef CONFIG_PROVE_RCU
331 extern int lockdep_tasklist_lock_is_held(void);
332 #endif /* #ifdef CONFIG_PROVE_RCU */
334 extern void sched_init(void);
335 extern void sched_init_smp(void);
336 extern asmlinkage
void schedule_tail(struct task_struct
*prev
);
337 extern void init_idle(struct task_struct
*idle
, int cpu
);
338 extern void init_idle_bootup_task(struct task_struct
*idle
);
340 extern cpumask_var_t cpu_isolated_map
;
342 extern int runqueue_is_locked(int cpu
);
344 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
345 extern void nohz_balance_enter_idle(int cpu
);
346 extern void set_cpu_sd_state_idle(void);
347 extern int get_nohz_timer_target(void);
349 static inline void nohz_balance_enter_idle(int cpu
) { }
350 static inline void set_cpu_sd_state_idle(void) { }
354 * Only dump TASK_* tasks. (0 for all tasks)
356 extern void show_state_filter(unsigned long state_filter
);
358 static inline void show_state(void)
360 show_state_filter(0);
363 extern void show_regs(struct pt_regs
*);
366 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
367 * task), SP is the stack pointer of the first frame that should be shown in the back
368 * trace (or NULL if the entire call-chain of the task should be shown).
370 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
372 extern void cpu_init (void);
373 extern void trap_init(void);
374 extern void update_process_times(int user
);
375 extern void scheduler_tick(void);
377 extern void sched_show_task(struct task_struct
*p
);
379 #ifdef CONFIG_LOCKUP_DETECTOR
380 extern void touch_softlockup_watchdog(void);
381 extern void touch_softlockup_watchdog_sync(void);
382 extern void touch_all_softlockup_watchdogs(void);
383 extern int proc_dowatchdog_thresh(struct ctl_table
*table
, int write
,
385 size_t *lenp
, loff_t
*ppos
);
386 extern unsigned int softlockup_panic
;
387 void lockup_detector_init(void);
389 static inline void touch_softlockup_watchdog(void)
392 static inline void touch_softlockup_watchdog_sync(void)
395 static inline void touch_all_softlockup_watchdogs(void)
398 static inline void lockup_detector_init(void)
403 #ifdef CONFIG_DETECT_HUNG_TASK
404 void reset_hung_task_detector(void);
406 static inline void reset_hung_task_detector(void)
411 /* Attach to any functions which should be ignored in wchan output. */
412 #define __sched __attribute__((__section__(".sched.text")))
414 /* Linker adds these: start and end of __sched functions */
415 extern char __sched_text_start
[], __sched_text_end
[];
417 /* Is this address in the __sched functions? */
418 extern int in_sched_functions(unsigned long addr
);
420 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
421 extern signed long schedule_timeout(signed long timeout
);
422 extern signed long schedule_timeout_interruptible(signed long timeout
);
423 extern signed long schedule_timeout_killable(signed long timeout
);
424 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
425 asmlinkage
void schedule(void);
426 extern void schedule_preempt_disabled(void);
428 extern long io_schedule_timeout(long timeout
);
430 static inline void io_schedule(void)
432 io_schedule_timeout(MAX_SCHEDULE_TIMEOUT
);
436 struct user_namespace
;
439 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
441 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
442 unsigned long, unsigned long);
444 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
445 unsigned long len
, unsigned long pgoff
,
446 unsigned long flags
);
448 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
) {}
451 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */
452 #define SUID_DUMP_USER 1 /* Dump as user of process */
453 #define SUID_DUMP_ROOT 2 /* Dump as root */
457 /* for SUID_DUMP_* above */
458 #define MMF_DUMPABLE_BITS 2
459 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
461 extern void set_dumpable(struct mm_struct
*mm
, int value
);
463 * This returns the actual value of the suid_dumpable flag. For things
464 * that are using this for checking for privilege transitions, it must
465 * test against SUID_DUMP_USER rather than treating it as a boolean
468 static inline int __get_dumpable(unsigned long mm_flags
)
470 return mm_flags
& MMF_DUMPABLE_MASK
;
473 static inline int get_dumpable(struct mm_struct
*mm
)
475 return __get_dumpable(mm
->flags
);
478 /* coredump filter bits */
479 #define MMF_DUMP_ANON_PRIVATE 2
480 #define MMF_DUMP_ANON_SHARED 3
481 #define MMF_DUMP_MAPPED_PRIVATE 4
482 #define MMF_DUMP_MAPPED_SHARED 5
483 #define MMF_DUMP_ELF_HEADERS 6
484 #define MMF_DUMP_HUGETLB_PRIVATE 7
485 #define MMF_DUMP_HUGETLB_SHARED 8
487 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
488 #define MMF_DUMP_FILTER_BITS 7
489 #define MMF_DUMP_FILTER_MASK \
490 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
491 #define MMF_DUMP_FILTER_DEFAULT \
492 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
493 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
495 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
496 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
498 # define MMF_DUMP_MASK_DEFAULT_ELF 0
500 /* leave room for more dump flags */
501 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
502 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
503 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
505 #define MMF_HAS_UPROBES 19 /* has uprobes */
506 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
508 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
510 struct sighand_struct
{
512 struct k_sigaction action
[_NSIG
];
514 wait_queue_head_t signalfd_wqh
;
517 struct pacct_struct
{
520 unsigned long ac_mem
;
521 cputime_t ac_utime
, ac_stime
;
522 unsigned long ac_minflt
, ac_majflt
;
533 * struct prev_cputime - snaphsot of system and user cputime
534 * @utime: time spent in user mode
535 * @stime: time spent in system mode
536 * @lock: protects the above two fields
538 * Stores previous user/system time values such that we can guarantee
541 struct prev_cputime
{
542 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
549 static inline void prev_cputime_init(struct prev_cputime
*prev
)
551 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
552 prev
->utime
= prev
->stime
= 0;
553 raw_spin_lock_init(&prev
->lock
);
558 * struct task_cputime - collected CPU time counts
559 * @utime: time spent in user mode, in &cputime_t units
560 * @stime: time spent in kernel mode, in &cputime_t units
561 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
563 * This structure groups together three kinds of CPU time that are tracked for
564 * threads and thread groups. Most things considering CPU time want to group
565 * these counts together and treat all three of them in parallel.
567 struct task_cputime
{
570 unsigned long long sum_exec_runtime
;
573 /* Alternate field names when used to cache expirations. */
574 #define virt_exp utime
575 #define prof_exp stime
576 #define sched_exp sum_exec_runtime
578 #define INIT_CPUTIME \
579 (struct task_cputime) { \
582 .sum_exec_runtime = 0, \
586 * This is the atomic variant of task_cputime, which can be used for
587 * storing and updating task_cputime statistics without locking.
589 struct task_cputime_atomic
{
592 atomic64_t sum_exec_runtime
;
595 #define INIT_CPUTIME_ATOMIC \
596 (struct task_cputime_atomic) { \
597 .utime = ATOMIC64_INIT(0), \
598 .stime = ATOMIC64_INIT(0), \
599 .sum_exec_runtime = ATOMIC64_INIT(0), \
602 #ifdef CONFIG_PREEMPT_COUNT
603 #define PREEMPT_DISABLED (1 + PREEMPT_ENABLED)
605 #define PREEMPT_DISABLED PREEMPT_ENABLED
609 * Disable preemption until the scheduler is running.
610 * Reset by start_kernel()->sched_init()->init_idle().
612 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
613 * before the scheduler is active -- see should_resched().
615 #define INIT_PREEMPT_COUNT (PREEMPT_DISABLED + PREEMPT_ACTIVE)
618 * struct thread_group_cputimer - thread group interval timer counts
619 * @cputime_atomic: atomic thread group interval timers.
620 * @running: non-zero when there are timers running and
621 * @cputime receives updates.
623 * This structure contains the version of task_cputime, above, that is
624 * used for thread group CPU timer calculations.
626 struct thread_group_cputimer
{
627 struct task_cputime_atomic cputime_atomic
;
631 #include <linux/rwsem.h>
635 * NOTE! "signal_struct" does not have its own
636 * locking, because a shared signal_struct always
637 * implies a shared sighand_struct, so locking
638 * sighand_struct is always a proper superset of
639 * the locking of signal_struct.
641 struct signal_struct
{
645 struct list_head thread_head
;
647 wait_queue_head_t wait_chldexit
; /* for wait4() */
649 /* current thread group signal load-balancing target: */
650 struct task_struct
*curr_target
;
652 /* shared signal handling: */
653 struct sigpending shared_pending
;
655 /* thread group exit support */
658 * - notify group_exit_task when ->count is equal to notify_count
659 * - everyone except group_exit_task is stopped during signal delivery
660 * of fatal signals, group_exit_task processes the signal.
663 struct task_struct
*group_exit_task
;
665 /* thread group stop support, overloads group_exit_code too */
666 int group_stop_count
;
667 unsigned int flags
; /* see SIGNAL_* flags below */
670 * PR_SET_CHILD_SUBREAPER marks a process, like a service
671 * manager, to re-parent orphan (double-forking) child processes
672 * to this process instead of 'init'. The service manager is
673 * able to receive SIGCHLD signals and is able to investigate
674 * the process until it calls wait(). All children of this
675 * process will inherit a flag if they should look for a
676 * child_subreaper process at exit.
678 unsigned int is_child_subreaper
:1;
679 unsigned int has_child_subreaper
:1;
681 /* POSIX.1b Interval Timers */
683 struct list_head posix_timers
;
685 /* ITIMER_REAL timer for the process */
686 struct hrtimer real_timer
;
687 struct pid
*leader_pid
;
688 ktime_t it_real_incr
;
691 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
692 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
693 * values are defined to 0 and 1 respectively
695 struct cpu_itimer it
[2];
698 * Thread group totals for process CPU timers.
699 * See thread_group_cputimer(), et al, for details.
701 struct thread_group_cputimer cputimer
;
703 /* Earliest-expiration cache. */
704 struct task_cputime cputime_expires
;
706 struct list_head cpu_timers
[3];
708 struct pid
*tty_old_pgrp
;
710 /* boolean value for session group leader */
713 struct tty_struct
*tty
; /* NULL if no tty */
715 #ifdef CONFIG_SCHED_AUTOGROUP
716 struct autogroup
*autogroup
;
719 * Cumulative resource counters for dead threads in the group,
720 * and for reaped dead child processes forked by this group.
721 * Live threads maintain their own counters and add to these
722 * in __exit_signal, except for the group leader.
724 seqlock_t stats_lock
;
725 cputime_t utime
, stime
, cutime
, cstime
;
728 struct prev_cputime prev_cputime
;
729 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
730 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
731 unsigned long inblock
, oublock
, cinblock
, coublock
;
732 unsigned long maxrss
, cmaxrss
;
733 struct task_io_accounting ioac
;
736 * Cumulative ns of schedule CPU time fo dead threads in the
737 * group, not including a zombie group leader, (This only differs
738 * from jiffies_to_ns(utime + stime) if sched_clock uses something
739 * other than jiffies.)
741 unsigned long long sum_sched_runtime
;
744 * We don't bother to synchronize most readers of this at all,
745 * because there is no reader checking a limit that actually needs
746 * to get both rlim_cur and rlim_max atomically, and either one
747 * alone is a single word that can safely be read normally.
748 * getrlimit/setrlimit use task_lock(current->group_leader) to
749 * protect this instead of the siglock, because they really
750 * have no need to disable irqs.
752 struct rlimit rlim
[RLIM_NLIMITS
];
754 #ifdef CONFIG_BSD_PROCESS_ACCT
755 struct pacct_struct pacct
; /* per-process accounting information */
757 #ifdef CONFIG_TASKSTATS
758 struct taskstats
*stats
;
762 unsigned audit_tty_log_passwd
;
763 struct tty_audit_buf
*tty_audit_buf
;
766 oom_flags_t oom_flags
;
767 short oom_score_adj
; /* OOM kill score adjustment */
768 short oom_score_adj_min
; /* OOM kill score adjustment min value.
769 * Only settable by CAP_SYS_RESOURCE. */
771 struct mutex cred_guard_mutex
; /* guard against foreign influences on
772 * credential calculations
773 * (notably. ptrace) */
777 * Bits in flags field of signal_struct.
779 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
780 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
781 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
782 #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */
784 * Pending notifications to parent.
786 #define SIGNAL_CLD_STOPPED 0x00000010
787 #define SIGNAL_CLD_CONTINUED 0x00000020
788 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
790 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
792 /* If true, all threads except ->group_exit_task have pending SIGKILL */
793 static inline int signal_group_exit(const struct signal_struct
*sig
)
795 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
796 (sig
->group_exit_task
!= NULL
);
800 * Some day this will be a full-fledged user tracking system..
803 atomic_t __count
; /* reference count */
804 atomic_t processes
; /* How many processes does this user have? */
805 atomic_t sigpending
; /* How many pending signals does this user have? */
806 #ifdef CONFIG_INOTIFY_USER
807 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
808 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
810 #ifdef CONFIG_FANOTIFY
811 atomic_t fanotify_listeners
;
814 atomic_long_t epoll_watches
; /* The number of file descriptors currently watched */
816 #ifdef CONFIG_POSIX_MQUEUE
817 /* protected by mq_lock */
818 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
820 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
823 struct key
*uid_keyring
; /* UID specific keyring */
824 struct key
*session_keyring
; /* UID's default session keyring */
827 /* Hash table maintenance information */
828 struct hlist_node uidhash_node
;
831 #ifdef CONFIG_PERF_EVENTS
832 atomic_long_t locked_vm
;
836 extern int uids_sysfs_init(void);
838 extern struct user_struct
*find_user(kuid_t
);
840 extern struct user_struct root_user
;
841 #define INIT_USER (&root_user)
844 struct backing_dev_info
;
845 struct reclaim_state
;
847 #ifdef CONFIG_SCHED_INFO
849 /* cumulative counters */
850 unsigned long pcount
; /* # of times run on this cpu */
851 unsigned long long run_delay
; /* time spent waiting on a runqueue */
854 unsigned long long last_arrival
,/* when we last ran on a cpu */
855 last_queued
; /* when we were last queued to run */
857 #endif /* CONFIG_SCHED_INFO */
859 #ifdef CONFIG_TASK_DELAY_ACCT
860 struct task_delay_info
{
862 unsigned int flags
; /* Private per-task flags */
864 /* For each stat XXX, add following, aligned appropriately
866 * struct timespec XXX_start, XXX_end;
870 * Atomicity of updates to XXX_delay, XXX_count protected by
871 * single lock above (split into XXX_lock if contention is an issue).
875 * XXX_count is incremented on every XXX operation, the delay
876 * associated with the operation is added to XXX_delay.
877 * XXX_delay contains the accumulated delay time in nanoseconds.
879 u64 blkio_start
; /* Shared by blkio, swapin */
880 u64 blkio_delay
; /* wait for sync block io completion */
881 u64 swapin_delay
; /* wait for swapin block io completion */
882 u32 blkio_count
; /* total count of the number of sync block */
883 /* io operations performed */
884 u32 swapin_count
; /* total count of the number of swapin block */
885 /* io operations performed */
888 u64 freepages_delay
; /* wait for memory reclaim */
889 u32 freepages_count
; /* total count of memory reclaim */
891 #endif /* CONFIG_TASK_DELAY_ACCT */
893 static inline int sched_info_on(void)
895 #ifdef CONFIG_SCHEDSTATS
897 #elif defined(CONFIG_TASK_DELAY_ACCT)
898 extern int delayacct_on
;
913 * Increase resolution of cpu_capacity calculations
915 #define SCHED_CAPACITY_SHIFT 10
916 #define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT)
919 * Wake-queues are lists of tasks with a pending wakeup, whose
920 * callers have already marked the task as woken internally,
921 * and can thus carry on. A common use case is being able to
922 * do the wakeups once the corresponding user lock as been
925 * We hold reference to each task in the list across the wakeup,
926 * thus guaranteeing that the memory is still valid by the time
927 * the actual wakeups are performed in wake_up_q().
929 * One per task suffices, because there's never a need for a task to be
930 * in two wake queues simultaneously; it is forbidden to abandon a task
931 * in a wake queue (a call to wake_up_q() _must_ follow), so if a task is
932 * already in a wake queue, the wakeup will happen soon and the second
933 * waker can just skip it.
935 * The WAKE_Q macro declares and initializes the list head.
936 * wake_up_q() does NOT reinitialize the list; it's expected to be
937 * called near the end of a function, where the fact that the queue is
938 * not used again will be easy to see by inspection.
940 * Note that this can cause spurious wakeups. schedule() callers
941 * must ensure the call is done inside a loop, confirming that the
942 * wakeup condition has in fact occurred.
945 struct wake_q_node
*next
;
949 struct wake_q_node
*first
;
950 struct wake_q_node
**lastp
;
953 #define WAKE_Q_TAIL ((struct wake_q_node *) 0x01)
955 #define WAKE_Q(name) \
956 struct wake_q_head name = { WAKE_Q_TAIL, &name.first }
958 extern void wake_q_add(struct wake_q_head
*head
,
959 struct task_struct
*task
);
960 extern void wake_up_q(struct wake_q_head
*head
);
963 * sched-domains (multiprocessor balancing) declarations:
966 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
967 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
968 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
969 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
970 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
971 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
972 #define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share cpu power */
973 #define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */
974 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
975 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
976 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
977 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
978 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
979 #define SD_NUMA 0x4000 /* cross-node balancing */
981 #ifdef CONFIG_SCHED_SMT
982 static inline int cpu_smt_flags(void)
984 return SD_SHARE_CPUCAPACITY
| SD_SHARE_PKG_RESOURCES
;
988 #ifdef CONFIG_SCHED_MC
989 static inline int cpu_core_flags(void)
991 return SD_SHARE_PKG_RESOURCES
;
996 static inline int cpu_numa_flags(void)
1002 struct sched_domain_attr
{
1003 int relax_domain_level
;
1006 #define SD_ATTR_INIT (struct sched_domain_attr) { \
1007 .relax_domain_level = -1, \
1010 extern int sched_domain_level_max
;
1014 struct sched_domain
{
1015 /* These fields must be setup */
1016 struct sched_domain
*parent
; /* top domain must be null terminated */
1017 struct sched_domain
*child
; /* bottom domain must be null terminated */
1018 struct sched_group
*groups
; /* the balancing groups of the domain */
1019 unsigned long min_interval
; /* Minimum balance interval ms */
1020 unsigned long max_interval
; /* Maximum balance interval ms */
1021 unsigned int busy_factor
; /* less balancing by factor if busy */
1022 unsigned int imbalance_pct
; /* No balance until over watermark */
1023 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
1024 unsigned int busy_idx
;
1025 unsigned int idle_idx
;
1026 unsigned int newidle_idx
;
1027 unsigned int wake_idx
;
1028 unsigned int forkexec_idx
;
1029 unsigned int smt_gain
;
1031 int nohz_idle
; /* NOHZ IDLE status */
1032 int flags
; /* See SD_* */
1035 /* Runtime fields. */
1036 unsigned long last_balance
; /* init to jiffies. units in jiffies */
1037 unsigned int balance_interval
; /* initialise to 1. units in ms. */
1038 unsigned int nr_balance_failed
; /* initialise to 0 */
1040 /* idle_balance() stats */
1041 u64 max_newidle_lb_cost
;
1042 unsigned long next_decay_max_lb_cost
;
1044 #ifdef CONFIG_SCHEDSTATS
1045 /* load_balance() stats */
1046 unsigned int lb_count
[CPU_MAX_IDLE_TYPES
];
1047 unsigned int lb_failed
[CPU_MAX_IDLE_TYPES
];
1048 unsigned int lb_balanced
[CPU_MAX_IDLE_TYPES
];
1049 unsigned int lb_imbalance
[CPU_MAX_IDLE_TYPES
];
1050 unsigned int lb_gained
[CPU_MAX_IDLE_TYPES
];
1051 unsigned int lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
1052 unsigned int lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
1053 unsigned int lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
1055 /* Active load balancing */
1056 unsigned int alb_count
;
1057 unsigned int alb_failed
;
1058 unsigned int alb_pushed
;
1060 /* SD_BALANCE_EXEC stats */
1061 unsigned int sbe_count
;
1062 unsigned int sbe_balanced
;
1063 unsigned int sbe_pushed
;
1065 /* SD_BALANCE_FORK stats */
1066 unsigned int sbf_count
;
1067 unsigned int sbf_balanced
;
1068 unsigned int sbf_pushed
;
1070 /* try_to_wake_up() stats */
1071 unsigned int ttwu_wake_remote
;
1072 unsigned int ttwu_move_affine
;
1073 unsigned int ttwu_move_balance
;
1075 #ifdef CONFIG_SCHED_DEBUG
1079 void *private; /* used during construction */
1080 struct rcu_head rcu
; /* used during destruction */
1083 unsigned int span_weight
;
1085 * Span of all CPUs in this domain.
1087 * NOTE: this field is variable length. (Allocated dynamically
1088 * by attaching extra space to the end of the structure,
1089 * depending on how many CPUs the kernel has booted up with)
1091 unsigned long span
[0];
1094 static inline struct cpumask
*sched_domain_span(struct sched_domain
*sd
)
1096 return to_cpumask(sd
->span
);
1099 extern void partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
1100 struct sched_domain_attr
*dattr_new
);
1102 /* Allocate an array of sched domains, for partition_sched_domains(). */
1103 cpumask_var_t
*alloc_sched_domains(unsigned int ndoms
);
1104 void free_sched_domains(cpumask_var_t doms
[], unsigned int ndoms
);
1106 bool cpus_share_cache(int this_cpu
, int that_cpu
);
1108 typedef const struct cpumask
*(*sched_domain_mask_f
)(int cpu
);
1109 typedef int (*sched_domain_flags_f
)(void);
1111 #define SDTL_OVERLAP 0x01
1114 struct sched_domain
**__percpu sd
;
1115 struct sched_group
**__percpu sg
;
1116 struct sched_group_capacity
**__percpu sgc
;
1119 struct sched_domain_topology_level
{
1120 sched_domain_mask_f mask
;
1121 sched_domain_flags_f sd_flags
;
1124 struct sd_data data
;
1125 #ifdef CONFIG_SCHED_DEBUG
1130 extern struct sched_domain_topology_level
*sched_domain_topology
;
1132 extern void set_sched_topology(struct sched_domain_topology_level
*tl
);
1133 extern void wake_up_if_idle(int cpu
);
1135 #ifdef CONFIG_SCHED_DEBUG
1136 # define SD_INIT_NAME(type) .name = #type
1138 # define SD_INIT_NAME(type)
1141 #else /* CONFIG_SMP */
1143 struct sched_domain_attr
;
1146 partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
1147 struct sched_domain_attr
*dattr_new
)
1151 static inline bool cpus_share_cache(int this_cpu
, int that_cpu
)
1156 #endif /* !CONFIG_SMP */
1159 struct io_context
; /* See blkdev.h */
1162 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1163 extern void prefetch_stack(struct task_struct
*t
);
1165 static inline void prefetch_stack(struct task_struct
*t
) { }
1168 struct audit_context
; /* See audit.c */
1170 struct pipe_inode_info
;
1171 struct uts_namespace
;
1173 struct load_weight
{
1174 unsigned long weight
;
1179 * The load_avg/util_avg accumulates an infinite geometric series.
1180 * 1) load_avg factors the amount of time that a sched_entity is
1181 * runnable on a rq into its weight. For cfs_rq, it is the aggregated
1182 * such weights of all runnable and blocked sched_entities.
1183 * 2) util_avg factors frequency scaling into the amount of time
1184 * that a sched_entity is running on a CPU, in the range [0..SCHED_LOAD_SCALE].
1185 * For cfs_rq, it is the aggregated such times of all runnable and
1186 * blocked sched_entities.
1187 * The 64 bit load_sum can:
1188 * 1) for cfs_rq, afford 4353082796 (=2^64/47742/88761) entities with
1189 * the highest weight (=88761) always runnable, we should not overflow
1190 * 2) for entity, support any load.weight always runnable
1193 u64 last_update_time
, load_sum
;
1194 u32 util_sum
, period_contrib
;
1195 unsigned long load_avg
, util_avg
;
1198 #ifdef CONFIG_SCHEDSTATS
1199 struct sched_statistics
{
1209 s64 sum_sleep_runtime
;
1216 u64 nr_migrations_cold
;
1217 u64 nr_failed_migrations_affine
;
1218 u64 nr_failed_migrations_running
;
1219 u64 nr_failed_migrations_hot
;
1220 u64 nr_forced_migrations
;
1223 u64 nr_wakeups_sync
;
1224 u64 nr_wakeups_migrate
;
1225 u64 nr_wakeups_local
;
1226 u64 nr_wakeups_remote
;
1227 u64 nr_wakeups_affine
;
1228 u64 nr_wakeups_affine_attempts
;
1229 u64 nr_wakeups_passive
;
1230 u64 nr_wakeups_idle
;
1234 struct sched_entity
{
1235 struct load_weight load
; /* for load-balancing */
1236 struct rb_node run_node
;
1237 struct list_head group_node
;
1241 u64 sum_exec_runtime
;
1243 u64 prev_sum_exec_runtime
;
1247 #ifdef CONFIG_SCHEDSTATS
1248 struct sched_statistics statistics
;
1251 #ifdef CONFIG_FAIR_GROUP_SCHED
1253 struct sched_entity
*parent
;
1254 /* rq on which this entity is (to be) queued: */
1255 struct cfs_rq
*cfs_rq
;
1256 /* rq "owned" by this entity/group: */
1257 struct cfs_rq
*my_q
;
1261 /* Per entity load average tracking */
1262 struct sched_avg avg
;
1266 struct sched_rt_entity
{
1267 struct list_head run_list
;
1268 unsigned long timeout
;
1269 unsigned long watchdog_stamp
;
1270 unsigned int time_slice
;
1272 struct sched_rt_entity
*back
;
1273 #ifdef CONFIG_RT_GROUP_SCHED
1274 struct sched_rt_entity
*parent
;
1275 /* rq on which this entity is (to be) queued: */
1276 struct rt_rq
*rt_rq
;
1277 /* rq "owned" by this entity/group: */
1282 struct sched_dl_entity
{
1283 struct rb_node rb_node
;
1286 * Original scheduling parameters. Copied here from sched_attr
1287 * during sched_setattr(), they will remain the same until
1288 * the next sched_setattr().
1290 u64 dl_runtime
; /* maximum runtime for each instance */
1291 u64 dl_deadline
; /* relative deadline of each instance */
1292 u64 dl_period
; /* separation of two instances (period) */
1293 u64 dl_bw
; /* dl_runtime / dl_deadline */
1296 * Actual scheduling parameters. Initialized with the values above,
1297 * they are continously updated during task execution. Note that
1298 * the remaining runtime could be < 0 in case we are in overrun.
1300 s64 runtime
; /* remaining runtime for this instance */
1301 u64 deadline
; /* absolute deadline for this instance */
1302 unsigned int flags
; /* specifying the scheduler behaviour */
1307 * @dl_throttled tells if we exhausted the runtime. If so, the
1308 * task has to wait for a replenishment to be performed at the
1309 * next firing of dl_timer.
1311 * @dl_new tells if a new instance arrived. If so we must
1312 * start executing it with full runtime and reset its absolute
1315 * @dl_boosted tells if we are boosted due to DI. If so we are
1316 * outside bandwidth enforcement mechanism (but only until we
1317 * exit the critical section);
1319 * @dl_yielded tells if task gave up the cpu before consuming
1320 * all its available runtime during the last job.
1322 int dl_throttled
, dl_new
, dl_boosted
, dl_yielded
;
1325 * Bandwidth enforcement timer. Each -deadline task has its
1326 * own bandwidth to be enforced, thus we need one timer per task.
1328 struct hrtimer dl_timer
;
1340 enum perf_event_task_context
{
1341 perf_invalid_context
= -1,
1342 perf_hw_context
= 0,
1344 perf_nr_task_contexts
,
1347 /* Track pages that require TLB flushes */
1348 struct tlbflush_unmap_batch
{
1350 * Each bit set is a CPU that potentially has a TLB entry for one of
1351 * the PFNs being flushed. See set_tlb_ubc_flush_pending().
1353 struct cpumask cpumask
;
1355 /* True if any bit in cpumask is set */
1356 bool flush_required
;
1359 * If true then the PTE was dirty when unmapped. The entry must be
1360 * flushed before IO is initiated or a stale TLB entry potentially
1361 * allows an update without redirtying the page.
1366 struct task_struct
{
1367 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
1370 unsigned int flags
; /* per process flags, defined below */
1371 unsigned int ptrace
;
1374 struct llist_node wake_entry
;
1376 unsigned int wakee_flips
;
1377 unsigned long wakee_flip_decay_ts
;
1378 struct task_struct
*last_wakee
;
1384 int prio
, static_prio
, normal_prio
;
1385 unsigned int rt_priority
;
1386 const struct sched_class
*sched_class
;
1387 struct sched_entity se
;
1388 struct sched_rt_entity rt
;
1389 #ifdef CONFIG_CGROUP_SCHED
1390 struct task_group
*sched_task_group
;
1392 struct sched_dl_entity dl
;
1394 #ifdef CONFIG_PREEMPT_NOTIFIERS
1395 /* list of struct preempt_notifier: */
1396 struct hlist_head preempt_notifiers
;
1399 #ifdef CONFIG_BLK_DEV_IO_TRACE
1400 unsigned int btrace_seq
;
1403 unsigned int policy
;
1404 int nr_cpus_allowed
;
1405 cpumask_t cpus_allowed
;
1407 #ifdef CONFIG_PREEMPT_RCU
1408 int rcu_read_lock_nesting
;
1409 union rcu_special rcu_read_unlock_special
;
1410 struct list_head rcu_node_entry
;
1411 struct rcu_node
*rcu_blocked_node
;
1412 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1413 #ifdef CONFIG_TASKS_RCU
1414 unsigned long rcu_tasks_nvcsw
;
1415 bool rcu_tasks_holdout
;
1416 struct list_head rcu_tasks_holdout_list
;
1417 int rcu_tasks_idle_cpu
;
1418 #endif /* #ifdef CONFIG_TASKS_RCU */
1420 #ifdef CONFIG_SCHED_INFO
1421 struct sched_info sched_info
;
1424 struct list_head tasks
;
1426 struct plist_node pushable_tasks
;
1427 struct rb_node pushable_dl_tasks
;
1430 struct mm_struct
*mm
, *active_mm
;
1431 /* per-thread vma caching */
1432 u32 vmacache_seqnum
;
1433 struct vm_area_struct
*vmacache
[VMACACHE_SIZE
];
1434 #if defined(SPLIT_RSS_COUNTING)
1435 struct task_rss_stat rss_stat
;
1439 int exit_code
, exit_signal
;
1440 int pdeath_signal
; /* The signal sent when the parent dies */
1441 unsigned long jobctl
; /* JOBCTL_*, siglock protected */
1443 /* Used for emulating ABI behavior of previous Linux versions */
1444 unsigned int personality
;
1446 unsigned in_execve
:1; /* Tell the LSMs that the process is doing an
1448 unsigned in_iowait
:1;
1450 /* Revert to default priority/policy when forking */
1451 unsigned sched_reset_on_fork
:1;
1452 unsigned sched_contributes_to_load
:1;
1453 unsigned sched_migrated
:1;
1455 #ifdef CONFIG_MEMCG_KMEM
1456 unsigned memcg_kmem_skip_account
:1;
1458 #ifdef CONFIG_COMPAT_BRK
1459 unsigned brk_randomized
:1;
1462 unsigned long atomic_flags
; /* Flags needing atomic access. */
1464 struct restart_block restart_block
;
1469 #ifdef CONFIG_CC_STACKPROTECTOR
1470 /* Canary value for the -fstack-protector gcc feature */
1471 unsigned long stack_canary
;
1474 * pointers to (original) parent process, youngest child, younger sibling,
1475 * older sibling, respectively. (p->father can be replaced with
1476 * p->real_parent->pid)
1478 struct task_struct __rcu
*real_parent
; /* real parent process */
1479 struct task_struct __rcu
*parent
; /* recipient of SIGCHLD, wait4() reports */
1481 * children/sibling forms the list of my natural children
1483 struct list_head children
; /* list of my children */
1484 struct list_head sibling
; /* linkage in my parent's children list */
1485 struct task_struct
*group_leader
; /* threadgroup leader */
1488 * ptraced is the list of tasks this task is using ptrace on.
1489 * This includes both natural children and PTRACE_ATTACH targets.
1490 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1492 struct list_head ptraced
;
1493 struct list_head ptrace_entry
;
1495 /* PID/PID hash table linkage. */
1496 struct pid_link pids
[PIDTYPE_MAX
];
1497 struct list_head thread_group
;
1498 struct list_head thread_node
;
1500 struct completion
*vfork_done
; /* for vfork() */
1501 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
1502 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
1504 cputime_t utime
, stime
, utimescaled
, stimescaled
;
1506 struct prev_cputime prev_cputime
;
1507 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1508 seqlock_t vtime_seqlock
;
1509 unsigned long long vtime_snap
;
1514 } vtime_snap_whence
;
1516 unsigned long nvcsw
, nivcsw
; /* context switch counts */
1517 u64 start_time
; /* monotonic time in nsec */
1518 u64 real_start_time
; /* boot based time in nsec */
1519 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1520 unsigned long min_flt
, maj_flt
;
1522 struct task_cputime cputime_expires
;
1523 struct list_head cpu_timers
[3];
1525 /* process credentials */
1526 const struct cred __rcu
*real_cred
; /* objective and real subjective task
1527 * credentials (COW) */
1528 const struct cred __rcu
*cred
; /* effective (overridable) subjective task
1529 * credentials (COW) */
1530 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
1531 - access with [gs]et_task_comm (which lock
1532 it with task_lock())
1533 - initialized normally by setup_new_exec */
1534 /* file system info */
1535 struct nameidata
*nameidata
;
1536 #ifdef CONFIG_SYSVIPC
1538 struct sysv_sem sysvsem
;
1539 struct sysv_shm sysvshm
;
1541 #ifdef CONFIG_DETECT_HUNG_TASK
1542 /* hung task detection */
1543 unsigned long last_switch_count
;
1545 /* filesystem information */
1546 struct fs_struct
*fs
;
1547 /* open file information */
1548 struct files_struct
*files
;
1550 struct nsproxy
*nsproxy
;
1551 /* signal handlers */
1552 struct signal_struct
*signal
;
1553 struct sighand_struct
*sighand
;
1555 sigset_t blocked
, real_blocked
;
1556 sigset_t saved_sigmask
; /* restored if set_restore_sigmask() was used */
1557 struct sigpending pending
;
1559 unsigned long sas_ss_sp
;
1561 int (*notifier
)(void *priv
);
1562 void *notifier_data
;
1563 sigset_t
*notifier_mask
;
1564 struct callback_head
*task_works
;
1566 struct audit_context
*audit_context
;
1567 #ifdef CONFIG_AUDITSYSCALL
1569 unsigned int sessionid
;
1571 struct seccomp seccomp
;
1573 /* Thread group tracking */
1576 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1578 spinlock_t alloc_lock
;
1580 /* Protection of the PI data structures: */
1581 raw_spinlock_t pi_lock
;
1583 struct wake_q_node wake_q
;
1585 #ifdef CONFIG_RT_MUTEXES
1586 /* PI waiters blocked on a rt_mutex held by this task */
1587 struct rb_root pi_waiters
;
1588 struct rb_node
*pi_waiters_leftmost
;
1589 /* Deadlock detection and priority inheritance handling */
1590 struct rt_mutex_waiter
*pi_blocked_on
;
1593 #ifdef CONFIG_DEBUG_MUTEXES
1594 /* mutex deadlock detection */
1595 struct mutex_waiter
*blocked_on
;
1597 #ifdef CONFIG_TRACE_IRQFLAGS
1598 unsigned int irq_events
;
1599 unsigned long hardirq_enable_ip
;
1600 unsigned long hardirq_disable_ip
;
1601 unsigned int hardirq_enable_event
;
1602 unsigned int hardirq_disable_event
;
1603 int hardirqs_enabled
;
1604 int hardirq_context
;
1605 unsigned long softirq_disable_ip
;
1606 unsigned long softirq_enable_ip
;
1607 unsigned int softirq_disable_event
;
1608 unsigned int softirq_enable_event
;
1609 int softirqs_enabled
;
1610 int softirq_context
;
1612 #ifdef CONFIG_LOCKDEP
1613 # define MAX_LOCK_DEPTH 48UL
1616 unsigned int lockdep_recursion
;
1617 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1618 gfp_t lockdep_reclaim_gfp
;
1621 /* journalling filesystem info */
1624 /* stacked block device info */
1625 struct bio_list
*bio_list
;
1628 /* stack plugging */
1629 struct blk_plug
*plug
;
1633 struct reclaim_state
*reclaim_state
;
1635 struct backing_dev_info
*backing_dev_info
;
1637 struct io_context
*io_context
;
1639 unsigned long ptrace_message
;
1640 siginfo_t
*last_siginfo
; /* For ptrace use. */
1641 struct task_io_accounting ioac
;
1642 #if defined(CONFIG_TASK_XACCT)
1643 u64 acct_rss_mem1
; /* accumulated rss usage */
1644 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1645 cputime_t acct_timexpd
; /* stime + utime since last update */
1647 #ifdef CONFIG_CPUSETS
1648 nodemask_t mems_allowed
; /* Protected by alloc_lock */
1649 seqcount_t mems_allowed_seq
; /* Seqence no to catch updates */
1650 int cpuset_mem_spread_rotor
;
1651 int cpuset_slab_spread_rotor
;
1653 #ifdef CONFIG_CGROUPS
1654 /* Control Group info protected by css_set_lock */
1655 struct css_set __rcu
*cgroups
;
1656 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1657 struct list_head cg_list
;
1660 struct robust_list_head __user
*robust_list
;
1661 #ifdef CONFIG_COMPAT
1662 struct compat_robust_list_head __user
*compat_robust_list
;
1664 struct list_head pi_state_list
;
1665 struct futex_pi_state
*pi_state_cache
;
1667 #ifdef CONFIG_PERF_EVENTS
1668 struct perf_event_context
*perf_event_ctxp
[perf_nr_task_contexts
];
1669 struct mutex perf_event_mutex
;
1670 struct list_head perf_event_list
;
1672 #ifdef CONFIG_DEBUG_PREEMPT
1673 unsigned long preempt_disable_ip
;
1676 struct mempolicy
*mempolicy
; /* Protected by alloc_lock */
1678 short pref_node_fork
;
1680 #ifdef CONFIG_NUMA_BALANCING
1682 unsigned int numa_scan_period
;
1683 unsigned int numa_scan_period_max
;
1684 int numa_preferred_nid
;
1685 unsigned long numa_migrate_retry
;
1686 u64 node_stamp
; /* migration stamp */
1687 u64 last_task_numa_placement
;
1688 u64 last_sum_exec_runtime
;
1689 struct callback_head numa_work
;
1691 struct list_head numa_entry
;
1692 struct numa_group
*numa_group
;
1695 * numa_faults is an array split into four regions:
1696 * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer
1697 * in this precise order.
1699 * faults_memory: Exponential decaying average of faults on a per-node
1700 * basis. Scheduling placement decisions are made based on these
1701 * counts. The values remain static for the duration of a PTE scan.
1702 * faults_cpu: Track the nodes the process was running on when a NUMA
1703 * hinting fault was incurred.
1704 * faults_memory_buffer and faults_cpu_buffer: Record faults per node
1705 * during the current scan window. When the scan completes, the counts
1706 * in faults_memory and faults_cpu decay and these values are copied.
1708 unsigned long *numa_faults
;
1709 unsigned long total_numa_faults
;
1712 * numa_faults_locality tracks if faults recorded during the last
1713 * scan window were remote/local or failed to migrate. The task scan
1714 * period is adapted based on the locality of the faults with different
1715 * weights depending on whether they were shared or private faults
1717 unsigned long numa_faults_locality
[3];
1719 unsigned long numa_pages_migrated
;
1720 #endif /* CONFIG_NUMA_BALANCING */
1722 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
1723 struct tlbflush_unmap_batch tlb_ubc
;
1726 struct rcu_head rcu
;
1729 * cache last used pipe for splice
1731 struct pipe_inode_info
*splice_pipe
;
1733 struct page_frag task_frag
;
1735 #ifdef CONFIG_TASK_DELAY_ACCT
1736 struct task_delay_info
*delays
;
1738 #ifdef CONFIG_FAULT_INJECTION
1742 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1743 * balance_dirty_pages() for some dirty throttling pause
1746 int nr_dirtied_pause
;
1747 unsigned long dirty_paused_when
; /* start of a write-and-pause period */
1749 #ifdef CONFIG_LATENCYTOP
1750 int latency_record_count
;
1751 struct latency_record latency_record
[LT_SAVECOUNT
];
1754 * time slack values; these are used to round up poll() and
1755 * select() etc timeout values. These are in nanoseconds.
1757 unsigned long timer_slack_ns
;
1758 unsigned long default_timer_slack_ns
;
1761 unsigned int kasan_depth
;
1763 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1764 /* Index of current stored address in ret_stack */
1766 /* Stack of return addresses for return function tracing */
1767 struct ftrace_ret_stack
*ret_stack
;
1768 /* time stamp for last schedule */
1769 unsigned long long ftrace_timestamp
;
1771 * Number of functions that haven't been traced
1772 * because of depth overrun.
1774 atomic_t trace_overrun
;
1775 /* Pause for the tracing */
1776 atomic_t tracing_graph_pause
;
1778 #ifdef CONFIG_TRACING
1779 /* state flags for use by tracers */
1780 unsigned long trace
;
1781 /* bitmask and counter of trace recursion */
1782 unsigned long trace_recursion
;
1783 #endif /* CONFIG_TRACING */
1785 struct memcg_oom_info
{
1786 struct mem_cgroup
*memcg
;
1789 unsigned int may_oom
:1;
1792 #ifdef CONFIG_UPROBES
1793 struct uprobe_task
*utask
;
1795 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1796 unsigned int sequential_io
;
1797 unsigned int sequential_io_avg
;
1799 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
1800 unsigned long task_state_change
;
1802 int pagefault_disabled
;
1803 /* CPU-specific state of this task */
1804 struct thread_struct thread
;
1806 * WARNING: on x86, 'thread_struct' contains a variable-sized
1807 * structure. It *MUST* be at the end of 'task_struct'.
1809 * Do not put anything below here!
1813 #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
1814 extern int arch_task_struct_size __read_mostly
;
1816 # define arch_task_struct_size (sizeof(struct task_struct))
1819 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1820 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1822 #define TNF_MIGRATED 0x01
1823 #define TNF_NO_GROUP 0x02
1824 #define TNF_SHARED 0x04
1825 #define TNF_FAULT_LOCAL 0x08
1826 #define TNF_MIGRATE_FAIL 0x10
1828 #ifdef CONFIG_NUMA_BALANCING
1829 extern void task_numa_fault(int last_node
, int node
, int pages
, int flags
);
1830 extern pid_t
task_numa_group_id(struct task_struct
*p
);
1831 extern void set_numabalancing_state(bool enabled
);
1832 extern void task_numa_free(struct task_struct
*p
);
1833 extern bool should_numa_migrate_memory(struct task_struct
*p
, struct page
*page
,
1834 int src_nid
, int dst_cpu
);
1836 static inline void task_numa_fault(int last_node
, int node
, int pages
,
1840 static inline pid_t
task_numa_group_id(struct task_struct
*p
)
1844 static inline void set_numabalancing_state(bool enabled
)
1847 static inline void task_numa_free(struct task_struct
*p
)
1850 static inline bool should_numa_migrate_memory(struct task_struct
*p
,
1851 struct page
*page
, int src_nid
, int dst_cpu
)
1857 static inline struct pid
*task_pid(struct task_struct
*task
)
1859 return task
->pids
[PIDTYPE_PID
].pid
;
1862 static inline struct pid
*task_tgid(struct task_struct
*task
)
1864 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1868 * Without tasklist or rcu lock it is not safe to dereference
1869 * the result of task_pgrp/task_session even if task == current,
1870 * we can race with another thread doing sys_setsid/sys_setpgid.
1872 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1874 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1877 static inline struct pid
*task_session(struct task_struct
*task
)
1879 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1882 struct pid_namespace
;
1885 * the helpers to get the task's different pids as they are seen
1886 * from various namespaces
1888 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1889 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1891 * task_xid_nr_ns() : id seen from the ns specified;
1893 * set_task_vxid() : assigns a virtual id to a task;
1895 * see also pid_nr() etc in include/linux/pid.h
1897 pid_t
__task_pid_nr_ns(struct task_struct
*task
, enum pid_type type
,
1898 struct pid_namespace
*ns
);
1900 static inline pid_t
task_pid_nr(struct task_struct
*tsk
)
1905 static inline pid_t
task_pid_nr_ns(struct task_struct
*tsk
,
1906 struct pid_namespace
*ns
)
1908 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, ns
);
1911 static inline pid_t
task_pid_vnr(struct task_struct
*tsk
)
1913 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, NULL
);
1917 static inline pid_t
task_tgid_nr(struct task_struct
*tsk
)
1922 pid_t
task_tgid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1924 static inline pid_t
task_tgid_vnr(struct task_struct
*tsk
)
1926 return pid_vnr(task_tgid(tsk
));
1930 static inline int pid_alive(const struct task_struct
*p
);
1931 static inline pid_t
task_ppid_nr_ns(const struct task_struct
*tsk
, struct pid_namespace
*ns
)
1937 pid
= task_tgid_nr_ns(rcu_dereference(tsk
->real_parent
), ns
);
1943 static inline pid_t
task_ppid_nr(const struct task_struct
*tsk
)
1945 return task_ppid_nr_ns(tsk
, &init_pid_ns
);
1948 static inline pid_t
task_pgrp_nr_ns(struct task_struct
*tsk
,
1949 struct pid_namespace
*ns
)
1951 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, ns
);
1954 static inline pid_t
task_pgrp_vnr(struct task_struct
*tsk
)
1956 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, NULL
);
1960 static inline pid_t
task_session_nr_ns(struct task_struct
*tsk
,
1961 struct pid_namespace
*ns
)
1963 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, ns
);
1966 static inline pid_t
task_session_vnr(struct task_struct
*tsk
)
1968 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, NULL
);
1971 /* obsolete, do not use */
1972 static inline pid_t
task_pgrp_nr(struct task_struct
*tsk
)
1974 return task_pgrp_nr_ns(tsk
, &init_pid_ns
);
1978 * pid_alive - check that a task structure is not stale
1979 * @p: Task structure to be checked.
1981 * Test if a process is not yet dead (at most zombie state)
1982 * If pid_alive fails, then pointers within the task structure
1983 * can be stale and must not be dereferenced.
1985 * Return: 1 if the process is alive. 0 otherwise.
1987 static inline int pid_alive(const struct task_struct
*p
)
1989 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1993 * is_global_init - check if a task structure is init
1994 * @tsk: Task structure to be checked.
1996 * Check if a task structure is the first user space task the kernel created.
1998 * Return: 1 if the task structure is init. 0 otherwise.
2000 static inline int is_global_init(struct task_struct
*tsk
)
2002 return tsk
->pid
== 1;
2005 extern struct pid
*cad_pid
;
2007 extern void free_task(struct task_struct
*tsk
);
2008 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
2010 extern void __put_task_struct(struct task_struct
*t
);
2012 static inline void put_task_struct(struct task_struct
*t
)
2014 if (atomic_dec_and_test(&t
->usage
))
2015 __put_task_struct(t
);
2018 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
2019 extern void task_cputime(struct task_struct
*t
,
2020 cputime_t
*utime
, cputime_t
*stime
);
2021 extern void task_cputime_scaled(struct task_struct
*t
,
2022 cputime_t
*utimescaled
, cputime_t
*stimescaled
);
2023 extern cputime_t
task_gtime(struct task_struct
*t
);
2025 static inline void task_cputime(struct task_struct
*t
,
2026 cputime_t
*utime
, cputime_t
*stime
)
2034 static inline void task_cputime_scaled(struct task_struct
*t
,
2035 cputime_t
*utimescaled
,
2036 cputime_t
*stimescaled
)
2039 *utimescaled
= t
->utimescaled
;
2041 *stimescaled
= t
->stimescaled
;
2044 static inline cputime_t
task_gtime(struct task_struct
*t
)
2049 extern void task_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
2050 extern void thread_group_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
2055 #define PF_EXITING 0x00000004 /* getting shut down */
2056 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
2057 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
2058 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
2059 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
2060 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
2061 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
2062 #define PF_DUMPCORE 0x00000200 /* dumped core */
2063 #define PF_SIGNALED 0x00000400 /* killed by a signal */
2064 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
2065 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
2066 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
2067 #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */
2068 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
2069 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
2070 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
2071 #define PF_KSWAPD 0x00040000 /* I am kswapd */
2072 #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */
2073 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
2074 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
2075 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
2076 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
2077 #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */
2078 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
2079 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
2080 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
2081 #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */
2084 * Only the _current_ task can read/write to tsk->flags, but other
2085 * tasks can access tsk->flags in readonly mode for example
2086 * with tsk_used_math (like during threaded core dumping).
2087 * There is however an exception to this rule during ptrace
2088 * or during fork: the ptracer task is allowed to write to the
2089 * child->flags of its traced child (same goes for fork, the parent
2090 * can write to the child->flags), because we're guaranteed the
2091 * child is not running and in turn not changing child->flags
2092 * at the same time the parent does it.
2094 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
2095 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
2096 #define clear_used_math() clear_stopped_child_used_math(current)
2097 #define set_used_math() set_stopped_child_used_math(current)
2098 #define conditional_stopped_child_used_math(condition, child) \
2099 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
2100 #define conditional_used_math(condition) \
2101 conditional_stopped_child_used_math(condition, current)
2102 #define copy_to_stopped_child_used_math(child) \
2103 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
2104 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
2105 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
2106 #define used_math() tsk_used_math(current)
2108 /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags
2109 * __GFP_FS is also cleared as it implies __GFP_IO.
2111 static inline gfp_t
memalloc_noio_flags(gfp_t flags
)
2113 if (unlikely(current
->flags
& PF_MEMALLOC_NOIO
))
2114 flags
&= ~(__GFP_IO
| __GFP_FS
);
2118 static inline unsigned int memalloc_noio_save(void)
2120 unsigned int flags
= current
->flags
& PF_MEMALLOC_NOIO
;
2121 current
->flags
|= PF_MEMALLOC_NOIO
;
2125 static inline void memalloc_noio_restore(unsigned int flags
)
2127 current
->flags
= (current
->flags
& ~PF_MEMALLOC_NOIO
) | flags
;
2130 /* Per-process atomic flags. */
2131 #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */
2132 #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */
2133 #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */
2136 #define TASK_PFA_TEST(name, func) \
2137 static inline bool task_##func(struct task_struct *p) \
2138 { return test_bit(PFA_##name, &p->atomic_flags); }
2139 #define TASK_PFA_SET(name, func) \
2140 static inline void task_set_##func(struct task_struct *p) \
2141 { set_bit(PFA_##name, &p->atomic_flags); }
2142 #define TASK_PFA_CLEAR(name, func) \
2143 static inline void task_clear_##func(struct task_struct *p) \
2144 { clear_bit(PFA_##name, &p->atomic_flags); }
2146 TASK_PFA_TEST(NO_NEW_PRIVS
, no_new_privs
)
2147 TASK_PFA_SET(NO_NEW_PRIVS
, no_new_privs
)
2149 TASK_PFA_TEST(SPREAD_PAGE
, spread_page
)
2150 TASK_PFA_SET(SPREAD_PAGE
, spread_page
)
2151 TASK_PFA_CLEAR(SPREAD_PAGE
, spread_page
)
2153 TASK_PFA_TEST(SPREAD_SLAB
, spread_slab
)
2154 TASK_PFA_SET(SPREAD_SLAB
, spread_slab
)
2155 TASK_PFA_CLEAR(SPREAD_SLAB
, spread_slab
)
2158 * task->jobctl flags
2160 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
2162 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
2163 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
2164 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
2165 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
2166 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
2167 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
2168 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
2170 #define JOBCTL_STOP_DEQUEUED (1UL << JOBCTL_STOP_DEQUEUED_BIT)
2171 #define JOBCTL_STOP_PENDING (1UL << JOBCTL_STOP_PENDING_BIT)
2172 #define JOBCTL_STOP_CONSUME (1UL << JOBCTL_STOP_CONSUME_BIT)
2173 #define JOBCTL_TRAP_STOP (1UL << JOBCTL_TRAP_STOP_BIT)
2174 #define JOBCTL_TRAP_NOTIFY (1UL << JOBCTL_TRAP_NOTIFY_BIT)
2175 #define JOBCTL_TRAPPING (1UL << JOBCTL_TRAPPING_BIT)
2176 #define JOBCTL_LISTENING (1UL << JOBCTL_LISTENING_BIT)
2178 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
2179 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
2181 extern bool task_set_jobctl_pending(struct task_struct
*task
,
2182 unsigned long mask
);
2183 extern void task_clear_jobctl_trapping(struct task_struct
*task
);
2184 extern void task_clear_jobctl_pending(struct task_struct
*task
,
2185 unsigned long mask
);
2187 static inline void rcu_copy_process(struct task_struct
*p
)
2189 #ifdef CONFIG_PREEMPT_RCU
2190 p
->rcu_read_lock_nesting
= 0;
2191 p
->rcu_read_unlock_special
.s
= 0;
2192 p
->rcu_blocked_node
= NULL
;
2193 INIT_LIST_HEAD(&p
->rcu_node_entry
);
2194 #endif /* #ifdef CONFIG_PREEMPT_RCU */
2195 #ifdef CONFIG_TASKS_RCU
2196 p
->rcu_tasks_holdout
= false;
2197 INIT_LIST_HEAD(&p
->rcu_tasks_holdout_list
);
2198 p
->rcu_tasks_idle_cpu
= -1;
2199 #endif /* #ifdef CONFIG_TASKS_RCU */
2202 static inline void tsk_restore_flags(struct task_struct
*task
,
2203 unsigned long orig_flags
, unsigned long flags
)
2205 task
->flags
&= ~flags
;
2206 task
->flags
|= orig_flags
& flags
;
2209 extern int cpuset_cpumask_can_shrink(const struct cpumask
*cur
,
2210 const struct cpumask
*trial
);
2211 extern int task_can_attach(struct task_struct
*p
,
2212 const struct cpumask
*cs_cpus_allowed
);
2214 extern void do_set_cpus_allowed(struct task_struct
*p
,
2215 const struct cpumask
*new_mask
);
2217 extern int set_cpus_allowed_ptr(struct task_struct
*p
,
2218 const struct cpumask
*new_mask
);
2220 static inline void do_set_cpus_allowed(struct task_struct
*p
,
2221 const struct cpumask
*new_mask
)
2224 static inline int set_cpus_allowed_ptr(struct task_struct
*p
,
2225 const struct cpumask
*new_mask
)
2227 if (!cpumask_test_cpu(0, new_mask
))
2233 #ifdef CONFIG_NO_HZ_COMMON
2234 void calc_load_enter_idle(void);
2235 void calc_load_exit_idle(void);
2237 static inline void calc_load_enter_idle(void) { }
2238 static inline void calc_load_exit_idle(void) { }
2239 #endif /* CONFIG_NO_HZ_COMMON */
2242 * Do not use outside of architecture code which knows its limitations.
2244 * sched_clock() has no promise of monotonicity or bounded drift between
2245 * CPUs, use (which you should not) requires disabling IRQs.
2247 * Please use one of the three interfaces below.
2249 extern unsigned long long notrace
sched_clock(void);
2251 * See the comment in kernel/sched/clock.c
2253 extern u64
cpu_clock(int cpu
);
2254 extern u64
local_clock(void);
2255 extern u64
running_clock(void);
2256 extern u64
sched_clock_cpu(int cpu
);
2259 extern void sched_clock_init(void);
2261 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
2262 static inline void sched_clock_tick(void)
2266 static inline void sched_clock_idle_sleep_event(void)
2270 static inline void sched_clock_idle_wakeup_event(u64 delta_ns
)
2275 * Architectures can set this to 1 if they have specified
2276 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
2277 * but then during bootup it turns out that sched_clock()
2278 * is reliable after all:
2280 extern int sched_clock_stable(void);
2281 extern void set_sched_clock_stable(void);
2282 extern void clear_sched_clock_stable(void);
2284 extern void sched_clock_tick(void);
2285 extern void sched_clock_idle_sleep_event(void);
2286 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
2289 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
2291 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
2292 * The reason for this explicit opt-in is not to have perf penalty with
2293 * slow sched_clocks.
2295 extern void enable_sched_clock_irqtime(void);
2296 extern void disable_sched_clock_irqtime(void);
2298 static inline void enable_sched_clock_irqtime(void) {}
2299 static inline void disable_sched_clock_irqtime(void) {}
2302 extern unsigned long long
2303 task_sched_runtime(struct task_struct
*task
);
2305 /* sched_exec is called by processes performing an exec */
2307 extern void sched_exec(void);
2309 #define sched_exec() {}
2312 extern void sched_clock_idle_sleep_event(void);
2313 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
2315 #ifdef CONFIG_HOTPLUG_CPU
2316 extern void idle_task_exit(void);
2318 static inline void idle_task_exit(void) {}
2321 #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
2322 extern void wake_up_nohz_cpu(int cpu
);
2324 static inline void wake_up_nohz_cpu(int cpu
) { }
2327 #ifdef CONFIG_NO_HZ_FULL
2328 extern bool sched_can_stop_tick(void);
2329 extern u64
scheduler_tick_max_deferment(void);
2331 static inline bool sched_can_stop_tick(void) { return false; }
2334 #ifdef CONFIG_SCHED_AUTOGROUP
2335 extern void sched_autogroup_create_attach(struct task_struct
*p
);
2336 extern void sched_autogroup_detach(struct task_struct
*p
);
2337 extern void sched_autogroup_fork(struct signal_struct
*sig
);
2338 extern void sched_autogroup_exit(struct signal_struct
*sig
);
2339 #ifdef CONFIG_PROC_FS
2340 extern void proc_sched_autogroup_show_task(struct task_struct
*p
, struct seq_file
*m
);
2341 extern int proc_sched_autogroup_set_nice(struct task_struct
*p
, int nice
);
2344 static inline void sched_autogroup_create_attach(struct task_struct
*p
) { }
2345 static inline void sched_autogroup_detach(struct task_struct
*p
) { }
2346 static inline void sched_autogroup_fork(struct signal_struct
*sig
) { }
2347 static inline void sched_autogroup_exit(struct signal_struct
*sig
) { }
2350 extern int yield_to(struct task_struct
*p
, bool preempt
);
2351 extern void set_user_nice(struct task_struct
*p
, long nice
);
2352 extern int task_prio(const struct task_struct
*p
);
2354 * task_nice - return the nice value of a given task.
2355 * @p: the task in question.
2357 * Return: The nice value [ -20 ... 0 ... 19 ].
2359 static inline int task_nice(const struct task_struct
*p
)
2361 return PRIO_TO_NICE((p
)->static_prio
);
2363 extern int can_nice(const struct task_struct
*p
, const int nice
);
2364 extern int task_curr(const struct task_struct
*p
);
2365 extern int idle_cpu(int cpu
);
2366 extern int sched_setscheduler(struct task_struct
*, int,
2367 const struct sched_param
*);
2368 extern int sched_setscheduler_nocheck(struct task_struct
*, int,
2369 const struct sched_param
*);
2370 extern int sched_setattr(struct task_struct
*,
2371 const struct sched_attr
*);
2372 extern struct task_struct
*idle_task(int cpu
);
2374 * is_idle_task - is the specified task an idle task?
2375 * @p: the task in question.
2377 * Return: 1 if @p is an idle task. 0 otherwise.
2379 static inline bool is_idle_task(const struct task_struct
*p
)
2383 extern struct task_struct
*curr_task(int cpu
);
2384 extern void set_curr_task(int cpu
, struct task_struct
*p
);
2388 union thread_union
{
2389 struct thread_info thread_info
;
2390 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
2393 #ifndef __HAVE_ARCH_KSTACK_END
2394 static inline int kstack_end(void *addr
)
2396 /* Reliable end of stack detection:
2397 * Some APM bios versions misalign the stack
2399 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
2403 extern union thread_union init_thread_union
;
2404 extern struct task_struct init_task
;
2406 extern struct mm_struct init_mm
;
2408 extern struct pid_namespace init_pid_ns
;
2411 * find a task by one of its numerical ids
2413 * find_task_by_pid_ns():
2414 * finds a task by its pid in the specified namespace
2415 * find_task_by_vpid():
2416 * finds a task by its virtual pid
2418 * see also find_vpid() etc in include/linux/pid.h
2421 extern struct task_struct
*find_task_by_vpid(pid_t nr
);
2422 extern struct task_struct
*find_task_by_pid_ns(pid_t nr
,
2423 struct pid_namespace
*ns
);
2425 /* per-UID process charging. */
2426 extern struct user_struct
* alloc_uid(kuid_t
);
2427 static inline struct user_struct
*get_uid(struct user_struct
*u
)
2429 atomic_inc(&u
->__count
);
2432 extern void free_uid(struct user_struct
*);
2434 #include <asm/current.h>
2436 extern void xtime_update(unsigned long ticks
);
2438 extern int wake_up_state(struct task_struct
*tsk
, unsigned int state
);
2439 extern int wake_up_process(struct task_struct
*tsk
);
2440 extern void wake_up_new_task(struct task_struct
*tsk
);
2442 extern void kick_process(struct task_struct
*tsk
);
2444 static inline void kick_process(struct task_struct
*tsk
) { }
2446 extern int sched_fork(unsigned long clone_flags
, struct task_struct
*p
);
2447 extern void sched_dead(struct task_struct
*p
);
2449 extern void proc_caches_init(void);
2450 extern void flush_signals(struct task_struct
*);
2451 extern void ignore_signals(struct task_struct
*);
2452 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
2453 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
2455 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
2457 unsigned long flags
;
2460 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
2461 ret
= dequeue_signal(tsk
, mask
, info
);
2462 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
2467 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
2469 extern void unblock_all_signals(void);
2470 extern void release_task(struct task_struct
* p
);
2471 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
2472 extern int force_sigsegv(int, struct task_struct
*);
2473 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
2474 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
2475 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
2476 extern int kill_pid_info_as_cred(int, struct siginfo
*, struct pid
*,
2477 const struct cred
*, u32
);
2478 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
2479 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
2480 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
2481 extern __must_check
bool do_notify_parent(struct task_struct
*, int);
2482 extern void __wake_up_parent(struct task_struct
*p
, struct task_struct
*parent
);
2483 extern void force_sig(int, struct task_struct
*);
2484 extern int send_sig(int, struct task_struct
*, int);
2485 extern int zap_other_threads(struct task_struct
*p
);
2486 extern struct sigqueue
*sigqueue_alloc(void);
2487 extern void sigqueue_free(struct sigqueue
*);
2488 extern int send_sigqueue(struct sigqueue
*, struct task_struct
*, int group
);
2489 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
2491 static inline void restore_saved_sigmask(void)
2493 if (test_and_clear_restore_sigmask())
2494 __set_current_blocked(¤t
->saved_sigmask
);
2497 static inline sigset_t
*sigmask_to_save(void)
2499 sigset_t
*res
= ¤t
->blocked
;
2500 if (unlikely(test_restore_sigmask()))
2501 res
= ¤t
->saved_sigmask
;
2505 static inline int kill_cad_pid(int sig
, int priv
)
2507 return kill_pid(cad_pid
, sig
, priv
);
2510 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2511 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2512 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2513 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2516 * True if we are on the alternate signal stack.
2518 static inline int on_sig_stack(unsigned long sp
)
2520 #ifdef CONFIG_STACK_GROWSUP
2521 return sp
>= current
->sas_ss_sp
&&
2522 sp
- current
->sas_ss_sp
< current
->sas_ss_size
;
2524 return sp
> current
->sas_ss_sp
&&
2525 sp
- current
->sas_ss_sp
<= current
->sas_ss_size
;
2529 static inline int sas_ss_flags(unsigned long sp
)
2531 if (!current
->sas_ss_size
)
2534 return on_sig_stack(sp
) ? SS_ONSTACK
: 0;
2537 static inline unsigned long sigsp(unsigned long sp
, struct ksignal
*ksig
)
2539 if (unlikely((ksig
->ka
.sa
.sa_flags
& SA_ONSTACK
)) && ! sas_ss_flags(sp
))
2540 #ifdef CONFIG_STACK_GROWSUP
2541 return current
->sas_ss_sp
;
2543 return current
->sas_ss_sp
+ current
->sas_ss_size
;
2549 * Routines for handling mm_structs
2551 extern struct mm_struct
* mm_alloc(void);
2553 /* mmdrop drops the mm and the page tables */
2554 extern void __mmdrop(struct mm_struct
*);
2555 static inline void mmdrop(struct mm_struct
* mm
)
2557 if (unlikely(atomic_dec_and_test(&mm
->mm_count
)))
2561 /* mmput gets rid of the mappings and all user-space */
2562 extern void mmput(struct mm_struct
*);
2563 /* Grab a reference to a task's mm, if it is not already going away */
2564 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
2566 * Grab a reference to a task's mm, if it is not already going away
2567 * and ptrace_may_access with the mode parameter passed to it
2570 extern struct mm_struct
*mm_access(struct task_struct
*task
, unsigned int mode
);
2571 /* Remove the current tasks stale references to the old mm_struct */
2572 extern void mm_release(struct task_struct
*, struct mm_struct
*);
2574 #ifdef CONFIG_HAVE_COPY_THREAD_TLS
2575 extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
2576 struct task_struct
*, unsigned long);
2578 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2579 struct task_struct
*);
2581 /* Architectures that haven't opted into copy_thread_tls get the tls argument
2582 * via pt_regs, so ignore the tls argument passed via C. */
2583 static inline int copy_thread_tls(
2584 unsigned long clone_flags
, unsigned long sp
, unsigned long arg
,
2585 struct task_struct
*p
, unsigned long tls
)
2587 return copy_thread(clone_flags
, sp
, arg
, p
);
2590 extern void flush_thread(void);
2591 extern void exit_thread(void);
2593 extern void exit_files(struct task_struct
*);
2594 extern void __cleanup_sighand(struct sighand_struct
*);
2596 extern void exit_itimers(struct signal_struct
*);
2597 extern void flush_itimer_signals(void);
2599 extern void do_group_exit(int);
2601 extern int do_execve(struct filename
*,
2602 const char __user
* const __user
*,
2603 const char __user
* const __user
*);
2604 extern int do_execveat(int, struct filename
*,
2605 const char __user
* const __user
*,
2606 const char __user
* const __user
*,
2608 extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user
*, int __user
*, unsigned long);
2609 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user
*, int __user
*);
2610 struct task_struct
*fork_idle(int);
2611 extern pid_t
kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
);
2613 extern void __set_task_comm(struct task_struct
*tsk
, const char *from
, bool exec
);
2614 static inline void set_task_comm(struct task_struct
*tsk
, const char *from
)
2616 __set_task_comm(tsk
, from
, false);
2618 extern char *get_task_comm(char *to
, struct task_struct
*tsk
);
2621 void scheduler_ipi(void);
2622 extern unsigned long wait_task_inactive(struct task_struct
*, long match_state
);
2624 static inline void scheduler_ipi(void) { }
2625 static inline unsigned long wait_task_inactive(struct task_struct
*p
,
2632 #define tasklist_empty() \
2633 list_empty(&init_task.tasks)
2635 #define next_task(p) \
2636 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2638 #define for_each_process(p) \
2639 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2641 extern bool current_is_single_threaded(void);
2644 * Careful: do_each_thread/while_each_thread is a double loop so
2645 * 'break' will not work as expected - use goto instead.
2647 #define do_each_thread(g, t) \
2648 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2650 #define while_each_thread(g, t) \
2651 while ((t = next_thread(t)) != g)
2653 #define __for_each_thread(signal, t) \
2654 list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
2656 #define for_each_thread(p, t) \
2657 __for_each_thread((p)->signal, t)
2659 /* Careful: this is a double loop, 'break' won't work as expected. */
2660 #define for_each_process_thread(p, t) \
2661 for_each_process(p) for_each_thread(p, t)
2663 static inline int get_nr_threads(struct task_struct
*tsk
)
2665 return tsk
->signal
->nr_threads
;
2668 static inline bool thread_group_leader(struct task_struct
*p
)
2670 return p
->exit_signal
>= 0;
2673 /* Do to the insanities of de_thread it is possible for a process
2674 * to have the pid of the thread group leader without actually being
2675 * the thread group leader. For iteration through the pids in proc
2676 * all we care about is that we have a task with the appropriate
2677 * pid, we don't actually care if we have the right task.
2679 static inline bool has_group_leader_pid(struct task_struct
*p
)
2681 return task_pid(p
) == p
->signal
->leader_pid
;
2685 bool same_thread_group(struct task_struct
*p1
, struct task_struct
*p2
)
2687 return p1
->signal
== p2
->signal
;
2690 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
2692 return list_entry_rcu(p
->thread_group
.next
,
2693 struct task_struct
, thread_group
);
2696 static inline int thread_group_empty(struct task_struct
*p
)
2698 return list_empty(&p
->thread_group
);
2701 #define delay_group_leader(p) \
2702 (thread_group_leader(p) && !thread_group_empty(p))
2705 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2706 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2707 * pins the final release of task.io_context. Also protects ->cpuset and
2708 * ->cgroup.subsys[]. And ->vfork_done.
2710 * Nests both inside and outside of read_lock(&tasklist_lock).
2711 * It must not be nested with write_lock_irq(&tasklist_lock),
2712 * neither inside nor outside.
2714 static inline void task_lock(struct task_struct
*p
)
2716 spin_lock(&p
->alloc_lock
);
2719 static inline void task_unlock(struct task_struct
*p
)
2721 spin_unlock(&p
->alloc_lock
);
2724 extern struct sighand_struct
*__lock_task_sighand(struct task_struct
*tsk
,
2725 unsigned long *flags
);
2727 static inline struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
2728 unsigned long *flags
)
2730 struct sighand_struct
*ret
;
2732 ret
= __lock_task_sighand(tsk
, flags
);
2733 (void)__cond_lock(&tsk
->sighand
->siglock
, ret
);
2737 static inline void unlock_task_sighand(struct task_struct
*tsk
,
2738 unsigned long *flags
)
2740 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
2744 * threadgroup_change_begin - mark the beginning of changes to a threadgroup
2745 * @tsk: task causing the changes
2747 * All operations which modify a threadgroup - a new thread joining the
2748 * group, death of a member thread (the assertion of PF_EXITING) and
2749 * exec(2) dethreading the process and replacing the leader - are wrapped
2750 * by threadgroup_change_{begin|end}(). This is to provide a place which
2751 * subsystems needing threadgroup stability can hook into for
2754 static inline void threadgroup_change_begin(struct task_struct
*tsk
)
2757 cgroup_threadgroup_change_begin(tsk
);
2761 * threadgroup_change_end - mark the end of changes to a threadgroup
2762 * @tsk: task causing the changes
2764 * See threadgroup_change_begin().
2766 static inline void threadgroup_change_end(struct task_struct
*tsk
)
2768 cgroup_threadgroup_change_end(tsk
);
2771 #ifndef __HAVE_THREAD_FUNCTIONS
2773 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2774 #define task_stack_page(task) ((task)->stack)
2776 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
2778 *task_thread_info(p
) = *task_thread_info(org
);
2779 task_thread_info(p
)->task
= p
;
2783 * Return the address of the last usable long on the stack.
2785 * When the stack grows down, this is just above the thread
2786 * info struct. Going any lower will corrupt the threadinfo.
2788 * When the stack grows up, this is the highest address.
2789 * Beyond that position, we corrupt data on the next page.
2791 static inline unsigned long *end_of_stack(struct task_struct
*p
)
2793 #ifdef CONFIG_STACK_GROWSUP
2794 return (unsigned long *)((unsigned long)task_thread_info(p
) + THREAD_SIZE
) - 1;
2796 return (unsigned long *)(task_thread_info(p
) + 1);
2801 #define task_stack_end_corrupted(task) \
2802 (*(end_of_stack(task)) != STACK_END_MAGIC)
2804 static inline int object_is_on_stack(void *obj
)
2806 void *stack
= task_stack_page(current
);
2808 return (obj
>= stack
) && (obj
< (stack
+ THREAD_SIZE
));
2811 extern void thread_info_cache_init(void);
2813 #ifdef CONFIG_DEBUG_STACK_USAGE
2814 static inline unsigned long stack_not_used(struct task_struct
*p
)
2816 unsigned long *n
= end_of_stack(p
);
2818 do { /* Skip over canary */
2822 return (unsigned long)n
- (unsigned long)end_of_stack(p
);
2825 extern void set_task_stack_end_magic(struct task_struct
*tsk
);
2827 /* set thread flags in other task's structures
2828 * - see asm/thread_info.h for TIF_xxxx flags available
2830 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2832 set_ti_thread_flag(task_thread_info(tsk
), flag
);
2835 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2837 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2840 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2842 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
2845 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2847 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2850 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2852 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
2855 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
2857 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2860 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
2862 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2865 static inline int test_tsk_need_resched(struct task_struct
*tsk
)
2867 return unlikely(test_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
));
2870 static inline int restart_syscall(void)
2872 set_tsk_thread_flag(current
, TIF_SIGPENDING
);
2873 return -ERESTARTNOINTR
;
2876 static inline int signal_pending(struct task_struct
*p
)
2878 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
2881 static inline int __fatal_signal_pending(struct task_struct
*p
)
2883 return unlikely(sigismember(&p
->pending
.signal
, SIGKILL
));
2886 static inline int fatal_signal_pending(struct task_struct
*p
)
2888 return signal_pending(p
) && __fatal_signal_pending(p
);
2891 static inline int signal_pending_state(long state
, struct task_struct
*p
)
2893 if (!(state
& (TASK_INTERRUPTIBLE
| TASK_WAKEKILL
)))
2895 if (!signal_pending(p
))
2898 return (state
& TASK_INTERRUPTIBLE
) || __fatal_signal_pending(p
);
2902 * cond_resched() and cond_resched_lock(): latency reduction via
2903 * explicit rescheduling in places that are safe. The return
2904 * value indicates whether a reschedule was done in fact.
2905 * cond_resched_lock() will drop the spinlock before scheduling,
2906 * cond_resched_softirq() will enable bhs before scheduling.
2908 extern int _cond_resched(void);
2910 #define cond_resched() ({ \
2911 ___might_sleep(__FILE__, __LINE__, 0); \
2915 extern int __cond_resched_lock(spinlock_t
*lock
);
2917 #define cond_resched_lock(lock) ({ \
2918 ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\
2919 __cond_resched_lock(lock); \
2922 extern int __cond_resched_softirq(void);
2924 #define cond_resched_softirq() ({ \
2925 ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2926 __cond_resched_softirq(); \
2929 static inline void cond_resched_rcu(void)
2931 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
2939 * Does a critical section need to be broken due to another
2940 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2941 * but a general need for low latency)
2943 static inline int spin_needbreak(spinlock_t
*lock
)
2945 #ifdef CONFIG_PREEMPT
2946 return spin_is_contended(lock
);
2953 * Idle thread specific functions to determine the need_resched
2956 #ifdef TIF_POLLING_NRFLAG
2957 static inline int tsk_is_polling(struct task_struct
*p
)
2959 return test_tsk_thread_flag(p
, TIF_POLLING_NRFLAG
);
2962 static inline void __current_set_polling(void)
2964 set_thread_flag(TIF_POLLING_NRFLAG
);
2967 static inline bool __must_check
current_set_polling_and_test(void)
2969 __current_set_polling();
2972 * Polling state must be visible before we test NEED_RESCHED,
2973 * paired by resched_curr()
2975 smp_mb__after_atomic();
2977 return unlikely(tif_need_resched());
2980 static inline void __current_clr_polling(void)
2982 clear_thread_flag(TIF_POLLING_NRFLAG
);
2985 static inline bool __must_check
current_clr_polling_and_test(void)
2987 __current_clr_polling();
2990 * Polling state must be visible before we test NEED_RESCHED,
2991 * paired by resched_curr()
2993 smp_mb__after_atomic();
2995 return unlikely(tif_need_resched());
2999 static inline int tsk_is_polling(struct task_struct
*p
) { return 0; }
3000 static inline void __current_set_polling(void) { }
3001 static inline void __current_clr_polling(void) { }
3003 static inline bool __must_check
current_set_polling_and_test(void)
3005 return unlikely(tif_need_resched());
3007 static inline bool __must_check
current_clr_polling_and_test(void)
3009 return unlikely(tif_need_resched());
3013 static inline void current_clr_polling(void)
3015 __current_clr_polling();
3018 * Ensure we check TIF_NEED_RESCHED after we clear the polling bit.
3019 * Once the bit is cleared, we'll get IPIs with every new
3020 * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also
3023 smp_mb(); /* paired with resched_curr() */
3025 preempt_fold_need_resched();
3028 static __always_inline
bool need_resched(void)
3030 return unlikely(tif_need_resched());
3034 * Thread group CPU time accounting.
3036 void thread_group_cputime(struct task_struct
*tsk
, struct task_cputime
*times
);
3037 void thread_group_cputimer(struct task_struct
*tsk
, struct task_cputime
*times
);
3040 * Reevaluate whether the task has signals pending delivery.
3041 * Wake the task if so.
3042 * This is required every time the blocked sigset_t changes.
3043 * callers must hold sighand->siglock.
3045 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
3046 extern void recalc_sigpending(void);
3048 extern void signal_wake_up_state(struct task_struct
*t
, unsigned int state
);
3050 static inline void signal_wake_up(struct task_struct
*t
, bool resume
)
3052 signal_wake_up_state(t
, resume
? TASK_WAKEKILL
: 0);
3054 static inline void ptrace_signal_wake_up(struct task_struct
*t
, bool resume
)
3056 signal_wake_up_state(t
, resume
? __TASK_TRACED
: 0);
3060 * Wrappers for p->thread_info->cpu access. No-op on UP.
3064 static inline unsigned int task_cpu(const struct task_struct
*p
)
3066 return task_thread_info(p
)->cpu
;
3069 static inline int task_node(const struct task_struct
*p
)
3071 return cpu_to_node(task_cpu(p
));
3074 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
3078 static inline unsigned int task_cpu(const struct task_struct
*p
)
3083 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
3087 #endif /* CONFIG_SMP */
3089 extern long sched_setaffinity(pid_t pid
, const struct cpumask
*new_mask
);
3090 extern long sched_getaffinity(pid_t pid
, struct cpumask
*mask
);
3092 #ifdef CONFIG_CGROUP_SCHED
3093 extern struct task_group root_task_group
;
3094 #endif /* CONFIG_CGROUP_SCHED */
3096 extern int task_can_switch_user(struct user_struct
*up
,
3097 struct task_struct
*tsk
);
3099 #ifdef CONFIG_TASK_XACCT
3100 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
3102 tsk
->ioac
.rchar
+= amt
;
3105 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
3107 tsk
->ioac
.wchar
+= amt
;
3110 static inline void inc_syscr(struct task_struct
*tsk
)
3115 static inline void inc_syscw(struct task_struct
*tsk
)
3120 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
3124 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
3128 static inline void inc_syscr(struct task_struct
*tsk
)
3132 static inline void inc_syscw(struct task_struct
*tsk
)
3137 #ifndef TASK_SIZE_OF
3138 #define TASK_SIZE_OF(tsk) TASK_SIZE
3142 extern void mm_update_next_owner(struct mm_struct
*mm
);
3144 static inline void mm_update_next_owner(struct mm_struct
*mm
)
3147 #endif /* CONFIG_MEMCG */
3149 static inline unsigned long task_rlimit(const struct task_struct
*tsk
,
3152 return READ_ONCE(tsk
->signal
->rlim
[limit
].rlim_cur
);
3155 static inline unsigned long task_rlimit_max(const struct task_struct
*tsk
,
3158 return READ_ONCE(tsk
->signal
->rlim
[limit
].rlim_max
);
3161 static inline unsigned long rlimit(unsigned int limit
)
3163 return task_rlimit(current
, limit
);
3166 static inline unsigned long rlimit_max(unsigned int limit
)
3168 return task_rlimit_max(current
, limit
);