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/seccomp.h>
44 #include <linux/rcupdate.h>
45 #include <linux/rculist.h>
46 #include <linux/rtmutex.h>
48 #include <linux/time.h>
49 #include <linux/param.h>
50 #include <linux/resource.h>
51 #include <linux/timer.h>
52 #include <linux/hrtimer.h>
53 #include <linux/kcov.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 cpu_load_update_nohz_start(void);
181 extern void cpu_load_update_nohz_stop(void);
183 static inline void cpu_load_update_nohz_start(void) { }
184 static inline void cpu_load_update_nohz_stop(void) { }
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);
376 extern int sched_cpu_starting(unsigned int cpu
);
377 extern int sched_cpu_activate(unsigned int cpu
);
378 extern int sched_cpu_deactivate(unsigned int cpu
);
380 #ifdef CONFIG_HOTPLUG_CPU
381 extern int sched_cpu_dying(unsigned int cpu
);
383 # define sched_cpu_dying NULL
386 extern void sched_show_task(struct task_struct
*p
);
388 #ifdef CONFIG_LOCKUP_DETECTOR
389 extern void touch_softlockup_watchdog_sched(void);
390 extern void touch_softlockup_watchdog(void);
391 extern void touch_softlockup_watchdog_sync(void);
392 extern void touch_all_softlockup_watchdogs(void);
393 extern int proc_dowatchdog_thresh(struct ctl_table
*table
, int write
,
395 size_t *lenp
, loff_t
*ppos
);
396 extern unsigned int softlockup_panic
;
397 extern unsigned int hardlockup_panic
;
398 void lockup_detector_init(void);
400 static inline void touch_softlockup_watchdog_sched(void)
403 static inline void touch_softlockup_watchdog(void)
406 static inline void touch_softlockup_watchdog_sync(void)
409 static inline void touch_all_softlockup_watchdogs(void)
412 static inline void lockup_detector_init(void)
417 #ifdef CONFIG_DETECT_HUNG_TASK
418 void reset_hung_task_detector(void);
420 static inline void reset_hung_task_detector(void)
425 /* Attach to any functions which should be ignored in wchan output. */
426 #define __sched __attribute__((__section__(".sched.text")))
428 /* Linker adds these: start and end of __sched functions */
429 extern char __sched_text_start
[], __sched_text_end
[];
431 /* Is this address in the __sched functions? */
432 extern int in_sched_functions(unsigned long addr
);
434 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
435 extern signed long schedule_timeout(signed long timeout
);
436 extern signed long schedule_timeout_interruptible(signed long timeout
);
437 extern signed long schedule_timeout_killable(signed long timeout
);
438 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
439 extern signed long schedule_timeout_idle(signed long timeout
);
440 asmlinkage
void schedule(void);
441 extern void schedule_preempt_disabled(void);
443 extern long io_schedule_timeout(long timeout
);
445 static inline void io_schedule(void)
447 io_schedule_timeout(MAX_SCHEDULE_TIMEOUT
);
451 struct user_namespace
;
454 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
456 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
457 unsigned long, unsigned long);
459 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
460 unsigned long len
, unsigned long pgoff
,
461 unsigned long flags
);
463 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
) {}
466 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */
467 #define SUID_DUMP_USER 1 /* Dump as user of process */
468 #define SUID_DUMP_ROOT 2 /* Dump as root */
472 /* for SUID_DUMP_* above */
473 #define MMF_DUMPABLE_BITS 2
474 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
476 extern void set_dumpable(struct mm_struct
*mm
, int value
);
478 * This returns the actual value of the suid_dumpable flag. For things
479 * that are using this for checking for privilege transitions, it must
480 * test against SUID_DUMP_USER rather than treating it as a boolean
483 static inline int __get_dumpable(unsigned long mm_flags
)
485 return mm_flags
& MMF_DUMPABLE_MASK
;
488 static inline int get_dumpable(struct mm_struct
*mm
)
490 return __get_dumpable(mm
->flags
);
493 /* coredump filter bits */
494 #define MMF_DUMP_ANON_PRIVATE 2
495 #define MMF_DUMP_ANON_SHARED 3
496 #define MMF_DUMP_MAPPED_PRIVATE 4
497 #define MMF_DUMP_MAPPED_SHARED 5
498 #define MMF_DUMP_ELF_HEADERS 6
499 #define MMF_DUMP_HUGETLB_PRIVATE 7
500 #define MMF_DUMP_HUGETLB_SHARED 8
501 #define MMF_DUMP_DAX_PRIVATE 9
502 #define MMF_DUMP_DAX_SHARED 10
504 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
505 #define MMF_DUMP_FILTER_BITS 9
506 #define MMF_DUMP_FILTER_MASK \
507 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
508 #define MMF_DUMP_FILTER_DEFAULT \
509 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
510 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
512 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
513 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
515 # define MMF_DUMP_MASK_DEFAULT_ELF 0
517 /* leave room for more dump flags */
518 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
519 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
520 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
522 #define MMF_HAS_UPROBES 19 /* has uprobes */
523 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
524 #define MMF_OOM_REAPED 21 /* mm has been already reaped */
526 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
528 struct sighand_struct
{
530 struct k_sigaction action
[_NSIG
];
532 wait_queue_head_t signalfd_wqh
;
535 struct pacct_struct
{
538 unsigned long ac_mem
;
539 cputime_t ac_utime
, ac_stime
;
540 unsigned long ac_minflt
, ac_majflt
;
551 * struct prev_cputime - snaphsot of system and user cputime
552 * @utime: time spent in user mode
553 * @stime: time spent in system mode
554 * @lock: protects the above two fields
556 * Stores previous user/system time values such that we can guarantee
559 struct prev_cputime
{
560 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
567 static inline void prev_cputime_init(struct prev_cputime
*prev
)
569 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
570 prev
->utime
= prev
->stime
= 0;
571 raw_spin_lock_init(&prev
->lock
);
576 * struct task_cputime - collected CPU time counts
577 * @utime: time spent in user mode, in &cputime_t units
578 * @stime: time spent in kernel mode, in &cputime_t units
579 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
581 * This structure groups together three kinds of CPU time that are tracked for
582 * threads and thread groups. Most things considering CPU time want to group
583 * these counts together and treat all three of them in parallel.
585 struct task_cputime
{
588 unsigned long long sum_exec_runtime
;
591 /* Alternate field names when used to cache expirations. */
592 #define virt_exp utime
593 #define prof_exp stime
594 #define sched_exp sum_exec_runtime
596 #define INIT_CPUTIME \
597 (struct task_cputime) { \
600 .sum_exec_runtime = 0, \
604 * This is the atomic variant of task_cputime, which can be used for
605 * storing and updating task_cputime statistics without locking.
607 struct task_cputime_atomic
{
610 atomic64_t sum_exec_runtime
;
613 #define INIT_CPUTIME_ATOMIC \
614 (struct task_cputime_atomic) { \
615 .utime = ATOMIC64_INIT(0), \
616 .stime = ATOMIC64_INIT(0), \
617 .sum_exec_runtime = ATOMIC64_INIT(0), \
620 #define PREEMPT_DISABLED (PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED)
623 * Disable preemption until the scheduler is running -- use an unconditional
624 * value so that it also works on !PREEMPT_COUNT kernels.
626 * Reset by start_kernel()->sched_init()->init_idle()->init_idle_preempt_count().
628 #define INIT_PREEMPT_COUNT PREEMPT_OFFSET
631 * Initial preempt_count value; reflects the preempt_count schedule invariant
632 * which states that during context switches:
634 * preempt_count() == 2*PREEMPT_DISABLE_OFFSET
636 * Note: PREEMPT_DISABLE_OFFSET is 0 for !PREEMPT_COUNT kernels.
637 * Note: See finish_task_switch().
639 #define FORK_PREEMPT_COUNT (2*PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED)
642 * struct thread_group_cputimer - thread group interval timer counts
643 * @cputime_atomic: atomic thread group interval timers.
644 * @running: true when there are timers running and
645 * @cputime_atomic receives updates.
646 * @checking_timer: true when a thread in the group is in the
647 * process of checking for thread group timers.
649 * This structure contains the version of task_cputime, above, that is
650 * used for thread group CPU timer calculations.
652 struct thread_group_cputimer
{
653 struct task_cputime_atomic cputime_atomic
;
658 #include <linux/rwsem.h>
662 * NOTE! "signal_struct" does not have its own
663 * locking, because a shared signal_struct always
664 * implies a shared sighand_struct, so locking
665 * sighand_struct is always a proper superset of
666 * the locking of signal_struct.
668 struct signal_struct
{
672 atomic_t oom_victims
; /* # of TIF_MEDIE threads in this thread group */
673 struct list_head thread_head
;
675 wait_queue_head_t wait_chldexit
; /* for wait4() */
677 /* current thread group signal load-balancing target: */
678 struct task_struct
*curr_target
;
680 /* shared signal handling: */
681 struct sigpending shared_pending
;
683 /* thread group exit support */
686 * - notify group_exit_task when ->count is equal to notify_count
687 * - everyone except group_exit_task is stopped during signal delivery
688 * of fatal signals, group_exit_task processes the signal.
691 struct task_struct
*group_exit_task
;
693 /* thread group stop support, overloads group_exit_code too */
694 int group_stop_count
;
695 unsigned int flags
; /* see SIGNAL_* flags below */
698 * PR_SET_CHILD_SUBREAPER marks a process, like a service
699 * manager, to re-parent orphan (double-forking) child processes
700 * to this process instead of 'init'. The service manager is
701 * able to receive SIGCHLD signals and is able to investigate
702 * the process until it calls wait(). All children of this
703 * process will inherit a flag if they should look for a
704 * child_subreaper process at exit.
706 unsigned int is_child_subreaper
:1;
707 unsigned int has_child_subreaper
:1;
709 /* POSIX.1b Interval Timers */
711 struct list_head posix_timers
;
713 /* ITIMER_REAL timer for the process */
714 struct hrtimer real_timer
;
715 struct pid
*leader_pid
;
716 ktime_t it_real_incr
;
719 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
720 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
721 * values are defined to 0 and 1 respectively
723 struct cpu_itimer it
[2];
726 * Thread group totals for process CPU timers.
727 * See thread_group_cputimer(), et al, for details.
729 struct thread_group_cputimer cputimer
;
731 /* Earliest-expiration cache. */
732 struct task_cputime cputime_expires
;
734 #ifdef CONFIG_NO_HZ_FULL
735 atomic_t tick_dep_mask
;
738 struct list_head cpu_timers
[3];
740 struct pid
*tty_old_pgrp
;
742 /* boolean value for session group leader */
745 struct tty_struct
*tty
; /* NULL if no tty */
747 #ifdef CONFIG_SCHED_AUTOGROUP
748 struct autogroup
*autogroup
;
751 * Cumulative resource counters for dead threads in the group,
752 * and for reaped dead child processes forked by this group.
753 * Live threads maintain their own counters and add to these
754 * in __exit_signal, except for the group leader.
756 seqlock_t stats_lock
;
757 cputime_t utime
, stime
, cutime
, cstime
;
760 struct prev_cputime prev_cputime
;
761 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
762 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
763 unsigned long inblock
, oublock
, cinblock
, coublock
;
764 unsigned long maxrss
, cmaxrss
;
765 struct task_io_accounting ioac
;
768 * Cumulative ns of schedule CPU time fo dead threads in the
769 * group, not including a zombie group leader, (This only differs
770 * from jiffies_to_ns(utime + stime) if sched_clock uses something
771 * other than jiffies.)
773 unsigned long long sum_sched_runtime
;
776 * We don't bother to synchronize most readers of this at all,
777 * because there is no reader checking a limit that actually needs
778 * to get both rlim_cur and rlim_max atomically, and either one
779 * alone is a single word that can safely be read normally.
780 * getrlimit/setrlimit use task_lock(current->group_leader) to
781 * protect this instead of the siglock, because they really
782 * have no need to disable irqs.
784 struct rlimit rlim
[RLIM_NLIMITS
];
786 #ifdef CONFIG_BSD_PROCESS_ACCT
787 struct pacct_struct pacct
; /* per-process accounting information */
789 #ifdef CONFIG_TASKSTATS
790 struct taskstats
*stats
;
794 struct tty_audit_buf
*tty_audit_buf
;
797 oom_flags_t oom_flags
;
798 short oom_score_adj
; /* OOM kill score adjustment */
799 short oom_score_adj_min
; /* OOM kill score adjustment min value.
800 * Only settable by CAP_SYS_RESOURCE. */
802 struct mutex cred_guard_mutex
; /* guard against foreign influences on
803 * credential calculations
804 * (notably. ptrace) */
808 * Bits in flags field of signal_struct.
810 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
811 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
812 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
813 #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */
815 * Pending notifications to parent.
817 #define SIGNAL_CLD_STOPPED 0x00000010
818 #define SIGNAL_CLD_CONTINUED 0x00000020
819 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
821 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
823 /* If true, all threads except ->group_exit_task have pending SIGKILL */
824 static inline int signal_group_exit(const struct signal_struct
*sig
)
826 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
827 (sig
->group_exit_task
!= NULL
);
831 * Some day this will be a full-fledged user tracking system..
834 atomic_t __count
; /* reference count */
835 atomic_t processes
; /* How many processes does this user have? */
836 atomic_t sigpending
; /* How many pending signals does this user have? */
837 #ifdef CONFIG_INOTIFY_USER
838 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
839 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
841 #ifdef CONFIG_FANOTIFY
842 atomic_t fanotify_listeners
;
845 atomic_long_t epoll_watches
; /* The number of file descriptors currently watched */
847 #ifdef CONFIG_POSIX_MQUEUE
848 /* protected by mq_lock */
849 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
851 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
852 unsigned long unix_inflight
; /* How many files in flight in unix sockets */
853 atomic_long_t pipe_bufs
; /* how many pages are allocated in pipe buffers */
856 struct key
*uid_keyring
; /* UID specific keyring */
857 struct key
*session_keyring
; /* UID's default session keyring */
860 /* Hash table maintenance information */
861 struct hlist_node uidhash_node
;
864 #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL)
865 atomic_long_t locked_vm
;
869 extern int uids_sysfs_init(void);
871 extern struct user_struct
*find_user(kuid_t
);
873 extern struct user_struct root_user
;
874 #define INIT_USER (&root_user)
877 struct backing_dev_info
;
878 struct reclaim_state
;
880 #ifdef CONFIG_SCHED_INFO
882 /* cumulative counters */
883 unsigned long pcount
; /* # of times run on this cpu */
884 unsigned long long run_delay
; /* time spent waiting on a runqueue */
887 unsigned long long last_arrival
,/* when we last ran on a cpu */
888 last_queued
; /* when we were last queued to run */
890 #endif /* CONFIG_SCHED_INFO */
892 #ifdef CONFIG_TASK_DELAY_ACCT
893 struct task_delay_info
{
895 unsigned int flags
; /* Private per-task flags */
897 /* For each stat XXX, add following, aligned appropriately
899 * struct timespec XXX_start, XXX_end;
903 * Atomicity of updates to XXX_delay, XXX_count protected by
904 * single lock above (split into XXX_lock if contention is an issue).
908 * XXX_count is incremented on every XXX operation, the delay
909 * associated with the operation is added to XXX_delay.
910 * XXX_delay contains the accumulated delay time in nanoseconds.
912 u64 blkio_start
; /* Shared by blkio, swapin */
913 u64 blkio_delay
; /* wait for sync block io completion */
914 u64 swapin_delay
; /* wait for swapin block io completion */
915 u32 blkio_count
; /* total count of the number of sync block */
916 /* io operations performed */
917 u32 swapin_count
; /* total count of the number of swapin block */
918 /* io operations performed */
921 u64 freepages_delay
; /* wait for memory reclaim */
922 u32 freepages_count
; /* total count of memory reclaim */
924 #endif /* CONFIG_TASK_DELAY_ACCT */
926 static inline int sched_info_on(void)
928 #ifdef CONFIG_SCHEDSTATS
930 #elif defined(CONFIG_TASK_DELAY_ACCT)
931 extern int delayacct_on
;
938 #ifdef CONFIG_SCHEDSTATS
939 void force_schedstat_enabled(void);
950 * Integer metrics need fixed point arithmetic, e.g., sched/fair
951 * has a few: load, load_avg, util_avg, freq, and capacity.
953 * We define a basic fixed point arithmetic range, and then formalize
954 * all these metrics based on that basic range.
956 # define SCHED_FIXEDPOINT_SHIFT 10
957 # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT)
960 * Increase resolution of cpu_capacity calculations
962 #define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT
963 #define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT)
966 * Wake-queues are lists of tasks with a pending wakeup, whose
967 * callers have already marked the task as woken internally,
968 * and can thus carry on. A common use case is being able to
969 * do the wakeups once the corresponding user lock as been
972 * We hold reference to each task in the list across the wakeup,
973 * thus guaranteeing that the memory is still valid by the time
974 * the actual wakeups are performed in wake_up_q().
976 * One per task suffices, because there's never a need for a task to be
977 * in two wake queues simultaneously; it is forbidden to abandon a task
978 * in a wake queue (a call to wake_up_q() _must_ follow), so if a task is
979 * already in a wake queue, the wakeup will happen soon and the second
980 * waker can just skip it.
982 * The WAKE_Q macro declares and initializes the list head.
983 * wake_up_q() does NOT reinitialize the list; it's expected to be
984 * called near the end of a function, where the fact that the queue is
985 * not used again will be easy to see by inspection.
987 * Note that this can cause spurious wakeups. schedule() callers
988 * must ensure the call is done inside a loop, confirming that the
989 * wakeup condition has in fact occurred.
992 struct wake_q_node
*next
;
996 struct wake_q_node
*first
;
997 struct wake_q_node
**lastp
;
1000 #define WAKE_Q_TAIL ((struct wake_q_node *) 0x01)
1002 #define WAKE_Q(name) \
1003 struct wake_q_head name = { WAKE_Q_TAIL, &name.first }
1005 extern void wake_q_add(struct wake_q_head
*head
,
1006 struct task_struct
*task
);
1007 extern void wake_up_q(struct wake_q_head
*head
);
1010 * sched-domains (multiprocessor balancing) declarations:
1013 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
1014 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
1015 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
1016 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
1017 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
1018 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
1019 #define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share cpu power */
1020 #define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */
1021 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
1022 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
1023 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
1024 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
1025 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
1026 #define SD_NUMA 0x4000 /* cross-node balancing */
1028 #ifdef CONFIG_SCHED_SMT
1029 static inline int cpu_smt_flags(void)
1031 return SD_SHARE_CPUCAPACITY
| SD_SHARE_PKG_RESOURCES
;
1035 #ifdef CONFIG_SCHED_MC
1036 static inline int cpu_core_flags(void)
1038 return SD_SHARE_PKG_RESOURCES
;
1043 static inline int cpu_numa_flags(void)
1049 struct sched_domain_attr
{
1050 int relax_domain_level
;
1053 #define SD_ATTR_INIT (struct sched_domain_attr) { \
1054 .relax_domain_level = -1, \
1057 extern int sched_domain_level_max
;
1061 struct sched_domain
{
1062 /* These fields must be setup */
1063 struct sched_domain
*parent
; /* top domain must be null terminated */
1064 struct sched_domain
*child
; /* bottom domain must be null terminated */
1065 struct sched_group
*groups
; /* the balancing groups of the domain */
1066 unsigned long min_interval
; /* Minimum balance interval ms */
1067 unsigned long max_interval
; /* Maximum balance interval ms */
1068 unsigned int busy_factor
; /* less balancing by factor if busy */
1069 unsigned int imbalance_pct
; /* No balance until over watermark */
1070 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
1071 unsigned int busy_idx
;
1072 unsigned int idle_idx
;
1073 unsigned int newidle_idx
;
1074 unsigned int wake_idx
;
1075 unsigned int forkexec_idx
;
1076 unsigned int smt_gain
;
1078 int nohz_idle
; /* NOHZ IDLE status */
1079 int flags
; /* See SD_* */
1082 /* Runtime fields. */
1083 unsigned long last_balance
; /* init to jiffies. units in jiffies */
1084 unsigned int balance_interval
; /* initialise to 1. units in ms. */
1085 unsigned int nr_balance_failed
; /* initialise to 0 */
1087 /* idle_balance() stats */
1088 u64 max_newidle_lb_cost
;
1089 unsigned long next_decay_max_lb_cost
;
1091 #ifdef CONFIG_SCHEDSTATS
1092 /* load_balance() stats */
1093 unsigned int lb_count
[CPU_MAX_IDLE_TYPES
];
1094 unsigned int lb_failed
[CPU_MAX_IDLE_TYPES
];
1095 unsigned int lb_balanced
[CPU_MAX_IDLE_TYPES
];
1096 unsigned int lb_imbalance
[CPU_MAX_IDLE_TYPES
];
1097 unsigned int lb_gained
[CPU_MAX_IDLE_TYPES
];
1098 unsigned int lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
1099 unsigned int lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
1100 unsigned int lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
1102 /* Active load balancing */
1103 unsigned int alb_count
;
1104 unsigned int alb_failed
;
1105 unsigned int alb_pushed
;
1107 /* SD_BALANCE_EXEC stats */
1108 unsigned int sbe_count
;
1109 unsigned int sbe_balanced
;
1110 unsigned int sbe_pushed
;
1112 /* SD_BALANCE_FORK stats */
1113 unsigned int sbf_count
;
1114 unsigned int sbf_balanced
;
1115 unsigned int sbf_pushed
;
1117 /* try_to_wake_up() stats */
1118 unsigned int ttwu_wake_remote
;
1119 unsigned int ttwu_move_affine
;
1120 unsigned int ttwu_move_balance
;
1122 #ifdef CONFIG_SCHED_DEBUG
1126 void *private; /* used during construction */
1127 struct rcu_head rcu
; /* used during destruction */
1130 unsigned int span_weight
;
1132 * Span of all CPUs in this domain.
1134 * NOTE: this field is variable length. (Allocated dynamically
1135 * by attaching extra space to the end of the structure,
1136 * depending on how many CPUs the kernel has booted up with)
1138 unsigned long span
[0];
1141 static inline struct cpumask
*sched_domain_span(struct sched_domain
*sd
)
1143 return to_cpumask(sd
->span
);
1146 extern void partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
1147 struct sched_domain_attr
*dattr_new
);
1149 /* Allocate an array of sched domains, for partition_sched_domains(). */
1150 cpumask_var_t
*alloc_sched_domains(unsigned int ndoms
);
1151 void free_sched_domains(cpumask_var_t doms
[], unsigned int ndoms
);
1153 bool cpus_share_cache(int this_cpu
, int that_cpu
);
1155 typedef const struct cpumask
*(*sched_domain_mask_f
)(int cpu
);
1156 typedef int (*sched_domain_flags_f
)(void);
1158 #define SDTL_OVERLAP 0x01
1161 struct sched_domain
**__percpu sd
;
1162 struct sched_group
**__percpu sg
;
1163 struct sched_group_capacity
**__percpu sgc
;
1166 struct sched_domain_topology_level
{
1167 sched_domain_mask_f mask
;
1168 sched_domain_flags_f sd_flags
;
1171 struct sd_data data
;
1172 #ifdef CONFIG_SCHED_DEBUG
1177 extern void set_sched_topology(struct sched_domain_topology_level
*tl
);
1178 extern void wake_up_if_idle(int cpu
);
1180 #ifdef CONFIG_SCHED_DEBUG
1181 # define SD_INIT_NAME(type) .name = #type
1183 # define SD_INIT_NAME(type)
1186 #else /* CONFIG_SMP */
1188 struct sched_domain_attr
;
1191 partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
1192 struct sched_domain_attr
*dattr_new
)
1196 static inline bool cpus_share_cache(int this_cpu
, int that_cpu
)
1201 #endif /* !CONFIG_SMP */
1204 struct io_context
; /* See blkdev.h */
1207 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1208 extern void prefetch_stack(struct task_struct
*t
);
1210 static inline void prefetch_stack(struct task_struct
*t
) { }
1213 struct audit_context
; /* See audit.c */
1215 struct pipe_inode_info
;
1216 struct uts_namespace
;
1218 struct load_weight
{
1219 unsigned long weight
;
1224 * The load_avg/util_avg accumulates an infinite geometric series
1225 * (see __update_load_avg() in kernel/sched/fair.c).
1227 * [load_avg definition]
1229 * load_avg = runnable% * scale_load_down(load)
1231 * where runnable% is the time ratio that a sched_entity is runnable.
1232 * For cfs_rq, it is the aggregated load_avg of all runnable and
1233 * blocked sched_entities.
1235 * load_avg may also take frequency scaling into account:
1237 * load_avg = runnable% * scale_load_down(load) * freq%
1239 * where freq% is the CPU frequency normalized to the highest frequency.
1241 * [util_avg definition]
1243 * util_avg = running% * SCHED_CAPACITY_SCALE
1245 * where running% is the time ratio that a sched_entity is running on
1246 * a CPU. For cfs_rq, it is the aggregated util_avg of all runnable
1247 * and blocked sched_entities.
1249 * util_avg may also factor frequency scaling and CPU capacity scaling:
1251 * util_avg = running% * SCHED_CAPACITY_SCALE * freq% * capacity%
1253 * where freq% is the same as above, and capacity% is the CPU capacity
1254 * normalized to the greatest capacity (due to uarch differences, etc).
1256 * N.B., the above ratios (runnable%, running%, freq%, and capacity%)
1257 * themselves are in the range of [0, 1]. To do fixed point arithmetics,
1258 * we therefore scale them to as large a range as necessary. This is for
1259 * example reflected by util_avg's SCHED_CAPACITY_SCALE.
1263 * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities
1264 * with the highest load (=88761), always runnable on a single cfs_rq,
1265 * and should not overflow as the number already hits PID_MAX_LIMIT.
1267 * For all other cases (including 32-bit kernels), struct load_weight's
1268 * weight will overflow first before we do, because:
1270 * Max(load_avg) <= Max(load.weight)
1272 * Then it is the load_weight's responsibility to consider overflow
1276 u64 last_update_time
, load_sum
;
1277 u32 util_sum
, period_contrib
;
1278 unsigned long load_avg
, util_avg
;
1281 #ifdef CONFIG_SCHEDSTATS
1282 struct sched_statistics
{
1292 s64 sum_sleep_runtime
;
1299 u64 nr_migrations_cold
;
1300 u64 nr_failed_migrations_affine
;
1301 u64 nr_failed_migrations_running
;
1302 u64 nr_failed_migrations_hot
;
1303 u64 nr_forced_migrations
;
1306 u64 nr_wakeups_sync
;
1307 u64 nr_wakeups_migrate
;
1308 u64 nr_wakeups_local
;
1309 u64 nr_wakeups_remote
;
1310 u64 nr_wakeups_affine
;
1311 u64 nr_wakeups_affine_attempts
;
1312 u64 nr_wakeups_passive
;
1313 u64 nr_wakeups_idle
;
1317 struct sched_entity
{
1318 struct load_weight load
; /* for load-balancing */
1319 struct rb_node run_node
;
1320 struct list_head group_node
;
1324 u64 sum_exec_runtime
;
1326 u64 prev_sum_exec_runtime
;
1330 #ifdef CONFIG_SCHEDSTATS
1331 struct sched_statistics statistics
;
1334 #ifdef CONFIG_FAIR_GROUP_SCHED
1336 struct sched_entity
*parent
;
1337 /* rq on which this entity is (to be) queued: */
1338 struct cfs_rq
*cfs_rq
;
1339 /* rq "owned" by this entity/group: */
1340 struct cfs_rq
*my_q
;
1345 * Per entity load average tracking.
1347 * Put into separate cache line so it does not
1348 * collide with read-mostly values above.
1350 struct sched_avg avg ____cacheline_aligned_in_smp
;
1354 struct sched_rt_entity
{
1355 struct list_head run_list
;
1356 unsigned long timeout
;
1357 unsigned long watchdog_stamp
;
1358 unsigned int time_slice
;
1359 unsigned short on_rq
;
1360 unsigned short on_list
;
1362 struct sched_rt_entity
*back
;
1363 #ifdef CONFIG_RT_GROUP_SCHED
1364 struct sched_rt_entity
*parent
;
1365 /* rq on which this entity is (to be) queued: */
1366 struct rt_rq
*rt_rq
;
1367 /* rq "owned" by this entity/group: */
1372 struct sched_dl_entity
{
1373 struct rb_node rb_node
;
1376 * Original scheduling parameters. Copied here from sched_attr
1377 * during sched_setattr(), they will remain the same until
1378 * the next sched_setattr().
1380 u64 dl_runtime
; /* maximum runtime for each instance */
1381 u64 dl_deadline
; /* relative deadline of each instance */
1382 u64 dl_period
; /* separation of two instances (period) */
1383 u64 dl_bw
; /* dl_runtime / dl_deadline */
1386 * Actual scheduling parameters. Initialized with the values above,
1387 * they are continously updated during task execution. Note that
1388 * the remaining runtime could be < 0 in case we are in overrun.
1390 s64 runtime
; /* remaining runtime for this instance */
1391 u64 deadline
; /* absolute deadline for this instance */
1392 unsigned int flags
; /* specifying the scheduler behaviour */
1397 * @dl_throttled tells if we exhausted the runtime. If so, the
1398 * task has to wait for a replenishment to be performed at the
1399 * next firing of dl_timer.
1401 * @dl_boosted tells if we are boosted due to DI. If so we are
1402 * outside bandwidth enforcement mechanism (but only until we
1403 * exit the critical section);
1405 * @dl_yielded tells if task gave up the cpu before consuming
1406 * all its available runtime during the last job.
1408 int dl_throttled
, dl_boosted
, dl_yielded
;
1411 * Bandwidth enforcement timer. Each -deadline task has its
1412 * own bandwidth to be enforced, thus we need one timer per task.
1414 struct hrtimer dl_timer
;
1422 u8 pad
; /* Otherwise the compiler can store garbage here. */
1424 u32 s
; /* Set of bits. */
1428 enum perf_event_task_context
{
1429 perf_invalid_context
= -1,
1430 perf_hw_context
= 0,
1432 perf_nr_task_contexts
,
1435 /* Track pages that require TLB flushes */
1436 struct tlbflush_unmap_batch
{
1438 * Each bit set is a CPU that potentially has a TLB entry for one of
1439 * the PFNs being flushed. See set_tlb_ubc_flush_pending().
1441 struct cpumask cpumask
;
1443 /* True if any bit in cpumask is set */
1444 bool flush_required
;
1447 * If true then the PTE was dirty when unmapped. The entry must be
1448 * flushed before IO is initiated or a stale TLB entry potentially
1449 * allows an update without redirtying the page.
1454 struct task_struct
{
1455 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
1458 unsigned int flags
; /* per process flags, defined below */
1459 unsigned int ptrace
;
1462 struct llist_node wake_entry
;
1464 unsigned int wakee_flips
;
1465 unsigned long wakee_flip_decay_ts
;
1466 struct task_struct
*last_wakee
;
1472 int prio
, static_prio
, normal_prio
;
1473 unsigned int rt_priority
;
1474 const struct sched_class
*sched_class
;
1475 struct sched_entity se
;
1476 struct sched_rt_entity rt
;
1477 #ifdef CONFIG_CGROUP_SCHED
1478 struct task_group
*sched_task_group
;
1480 struct sched_dl_entity dl
;
1482 #ifdef CONFIG_PREEMPT_NOTIFIERS
1483 /* list of struct preempt_notifier: */
1484 struct hlist_head preempt_notifiers
;
1487 #ifdef CONFIG_BLK_DEV_IO_TRACE
1488 unsigned int btrace_seq
;
1491 unsigned int policy
;
1492 int nr_cpus_allowed
;
1493 cpumask_t cpus_allowed
;
1495 #ifdef CONFIG_PREEMPT_RCU
1496 int rcu_read_lock_nesting
;
1497 union rcu_special rcu_read_unlock_special
;
1498 struct list_head rcu_node_entry
;
1499 struct rcu_node
*rcu_blocked_node
;
1500 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1501 #ifdef CONFIG_TASKS_RCU
1502 unsigned long rcu_tasks_nvcsw
;
1503 bool rcu_tasks_holdout
;
1504 struct list_head rcu_tasks_holdout_list
;
1505 int rcu_tasks_idle_cpu
;
1506 #endif /* #ifdef CONFIG_TASKS_RCU */
1508 #ifdef CONFIG_SCHED_INFO
1509 struct sched_info sched_info
;
1512 struct list_head tasks
;
1514 struct plist_node pushable_tasks
;
1515 struct rb_node pushable_dl_tasks
;
1518 struct mm_struct
*mm
, *active_mm
;
1519 /* per-thread vma caching */
1520 u32 vmacache_seqnum
;
1521 struct vm_area_struct
*vmacache
[VMACACHE_SIZE
];
1522 #if defined(SPLIT_RSS_COUNTING)
1523 struct task_rss_stat rss_stat
;
1527 int exit_code
, exit_signal
;
1528 int pdeath_signal
; /* The signal sent when the parent dies */
1529 unsigned long jobctl
; /* JOBCTL_*, siglock protected */
1531 /* Used for emulating ABI behavior of previous Linux versions */
1532 unsigned int personality
;
1534 /* scheduler bits, serialized by scheduler locks */
1535 unsigned sched_reset_on_fork
:1;
1536 unsigned sched_contributes_to_load
:1;
1537 unsigned sched_migrated
:1;
1538 unsigned :0; /* force alignment to the next boundary */
1540 /* unserialized, strictly 'current' */
1541 unsigned in_execve
:1; /* bit to tell LSMs we're in execve */
1542 unsigned in_iowait
:1;
1544 unsigned memcg_may_oom
:1;
1546 unsigned memcg_kmem_skip_account
:1;
1549 #ifdef CONFIG_COMPAT_BRK
1550 unsigned brk_randomized
:1;
1553 unsigned long atomic_flags
; /* Flags needing atomic access. */
1555 struct restart_block restart_block
;
1560 #ifdef CONFIG_CC_STACKPROTECTOR
1561 /* Canary value for the -fstack-protector gcc feature */
1562 unsigned long stack_canary
;
1565 * pointers to (original) parent process, youngest child, younger sibling,
1566 * older sibling, respectively. (p->father can be replaced with
1567 * p->real_parent->pid)
1569 struct task_struct __rcu
*real_parent
; /* real parent process */
1570 struct task_struct __rcu
*parent
; /* recipient of SIGCHLD, wait4() reports */
1572 * children/sibling forms the list of my natural children
1574 struct list_head children
; /* list of my children */
1575 struct list_head sibling
; /* linkage in my parent's children list */
1576 struct task_struct
*group_leader
; /* threadgroup leader */
1579 * ptraced is the list of tasks this task is using ptrace on.
1580 * This includes both natural children and PTRACE_ATTACH targets.
1581 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1583 struct list_head ptraced
;
1584 struct list_head ptrace_entry
;
1586 /* PID/PID hash table linkage. */
1587 struct pid_link pids
[PIDTYPE_MAX
];
1588 struct list_head thread_group
;
1589 struct list_head thread_node
;
1591 struct completion
*vfork_done
; /* for vfork() */
1592 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
1593 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
1595 cputime_t utime
, stime
, utimescaled
, stimescaled
;
1597 struct prev_cputime prev_cputime
;
1598 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1599 seqcount_t vtime_seqcount
;
1600 unsigned long long vtime_snap
;
1602 /* Task is sleeping or running in a CPU with VTIME inactive */
1604 /* Task runs in userspace in a CPU with VTIME active */
1606 /* Task runs in kernelspace in a CPU with VTIME active */
1608 } vtime_snap_whence
;
1611 #ifdef CONFIG_NO_HZ_FULL
1612 atomic_t tick_dep_mask
;
1614 unsigned long nvcsw
, nivcsw
; /* context switch counts */
1615 u64 start_time
; /* monotonic time in nsec */
1616 u64 real_start_time
; /* boot based time in nsec */
1617 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1618 unsigned long min_flt
, maj_flt
;
1620 struct task_cputime cputime_expires
;
1621 struct list_head cpu_timers
[3];
1623 /* process credentials */
1624 const struct cred __rcu
*real_cred
; /* objective and real subjective task
1625 * credentials (COW) */
1626 const struct cred __rcu
*cred
; /* effective (overridable) subjective task
1627 * credentials (COW) */
1628 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
1629 - access with [gs]et_task_comm (which lock
1630 it with task_lock())
1631 - initialized normally by setup_new_exec */
1632 /* file system info */
1633 struct nameidata
*nameidata
;
1634 #ifdef CONFIG_SYSVIPC
1636 struct sysv_sem sysvsem
;
1637 struct sysv_shm sysvshm
;
1639 #ifdef CONFIG_DETECT_HUNG_TASK
1640 /* hung task detection */
1641 unsigned long last_switch_count
;
1643 /* filesystem information */
1644 struct fs_struct
*fs
;
1645 /* open file information */
1646 struct files_struct
*files
;
1648 struct nsproxy
*nsproxy
;
1649 /* signal handlers */
1650 struct signal_struct
*signal
;
1651 struct sighand_struct
*sighand
;
1653 sigset_t blocked
, real_blocked
;
1654 sigset_t saved_sigmask
; /* restored if set_restore_sigmask() was used */
1655 struct sigpending pending
;
1657 unsigned long sas_ss_sp
;
1659 unsigned sas_ss_flags
;
1661 struct callback_head
*task_works
;
1663 struct audit_context
*audit_context
;
1664 #ifdef CONFIG_AUDITSYSCALL
1666 unsigned int sessionid
;
1668 struct seccomp seccomp
;
1670 /* Thread group tracking */
1673 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1675 spinlock_t alloc_lock
;
1677 /* Protection of the PI data structures: */
1678 raw_spinlock_t pi_lock
;
1680 struct wake_q_node wake_q
;
1682 #ifdef CONFIG_RT_MUTEXES
1683 /* PI waiters blocked on a rt_mutex held by this task */
1684 struct rb_root pi_waiters
;
1685 struct rb_node
*pi_waiters_leftmost
;
1686 /* Deadlock detection and priority inheritance handling */
1687 struct rt_mutex_waiter
*pi_blocked_on
;
1690 #ifdef CONFIG_DEBUG_MUTEXES
1691 /* mutex deadlock detection */
1692 struct mutex_waiter
*blocked_on
;
1694 #ifdef CONFIG_TRACE_IRQFLAGS
1695 unsigned int irq_events
;
1696 unsigned long hardirq_enable_ip
;
1697 unsigned long hardirq_disable_ip
;
1698 unsigned int hardirq_enable_event
;
1699 unsigned int hardirq_disable_event
;
1700 int hardirqs_enabled
;
1701 int hardirq_context
;
1702 unsigned long softirq_disable_ip
;
1703 unsigned long softirq_enable_ip
;
1704 unsigned int softirq_disable_event
;
1705 unsigned int softirq_enable_event
;
1706 int softirqs_enabled
;
1707 int softirq_context
;
1709 #ifdef CONFIG_LOCKDEP
1710 # define MAX_LOCK_DEPTH 48UL
1713 unsigned int lockdep_recursion
;
1714 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1715 gfp_t lockdep_reclaim_gfp
;
1718 unsigned int in_ubsan
;
1721 /* journalling filesystem info */
1724 /* stacked block device info */
1725 struct bio_list
*bio_list
;
1728 /* stack plugging */
1729 struct blk_plug
*plug
;
1733 struct reclaim_state
*reclaim_state
;
1735 struct backing_dev_info
*backing_dev_info
;
1737 struct io_context
*io_context
;
1739 unsigned long ptrace_message
;
1740 siginfo_t
*last_siginfo
; /* For ptrace use. */
1741 struct task_io_accounting ioac
;
1742 #if defined(CONFIG_TASK_XACCT)
1743 u64 acct_rss_mem1
; /* accumulated rss usage */
1744 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1745 cputime_t acct_timexpd
; /* stime + utime since last update */
1747 #ifdef CONFIG_CPUSETS
1748 nodemask_t mems_allowed
; /* Protected by alloc_lock */
1749 seqcount_t mems_allowed_seq
; /* Seqence no to catch updates */
1750 int cpuset_mem_spread_rotor
;
1751 int cpuset_slab_spread_rotor
;
1753 #ifdef CONFIG_CGROUPS
1754 /* Control Group info protected by css_set_lock */
1755 struct css_set __rcu
*cgroups
;
1756 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1757 struct list_head cg_list
;
1760 struct robust_list_head __user
*robust_list
;
1761 #ifdef CONFIG_COMPAT
1762 struct compat_robust_list_head __user
*compat_robust_list
;
1764 struct list_head pi_state_list
;
1765 struct futex_pi_state
*pi_state_cache
;
1767 #ifdef CONFIG_PERF_EVENTS
1768 struct perf_event_context
*perf_event_ctxp
[perf_nr_task_contexts
];
1769 struct mutex perf_event_mutex
;
1770 struct list_head perf_event_list
;
1772 #ifdef CONFIG_DEBUG_PREEMPT
1773 unsigned long preempt_disable_ip
;
1776 struct mempolicy
*mempolicy
; /* Protected by alloc_lock */
1778 short pref_node_fork
;
1780 #ifdef CONFIG_NUMA_BALANCING
1782 unsigned int numa_scan_period
;
1783 unsigned int numa_scan_period_max
;
1784 int numa_preferred_nid
;
1785 unsigned long numa_migrate_retry
;
1786 u64 node_stamp
; /* migration stamp */
1787 u64 last_task_numa_placement
;
1788 u64 last_sum_exec_runtime
;
1789 struct callback_head numa_work
;
1791 struct list_head numa_entry
;
1792 struct numa_group
*numa_group
;
1795 * numa_faults is an array split into four regions:
1796 * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer
1797 * in this precise order.
1799 * faults_memory: Exponential decaying average of faults on a per-node
1800 * basis. Scheduling placement decisions are made based on these
1801 * counts. The values remain static for the duration of a PTE scan.
1802 * faults_cpu: Track the nodes the process was running on when a NUMA
1803 * hinting fault was incurred.
1804 * faults_memory_buffer and faults_cpu_buffer: Record faults per node
1805 * during the current scan window. When the scan completes, the counts
1806 * in faults_memory and faults_cpu decay and these values are copied.
1808 unsigned long *numa_faults
;
1809 unsigned long total_numa_faults
;
1812 * numa_faults_locality tracks if faults recorded during the last
1813 * scan window were remote/local or failed to migrate. The task scan
1814 * period is adapted based on the locality of the faults with different
1815 * weights depending on whether they were shared or private faults
1817 unsigned long numa_faults_locality
[3];
1819 unsigned long numa_pages_migrated
;
1820 #endif /* CONFIG_NUMA_BALANCING */
1822 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
1823 struct tlbflush_unmap_batch tlb_ubc
;
1826 struct rcu_head rcu
;
1829 * cache last used pipe for splice
1831 struct pipe_inode_info
*splice_pipe
;
1833 struct page_frag task_frag
;
1835 #ifdef CONFIG_TASK_DELAY_ACCT
1836 struct task_delay_info
*delays
;
1838 #ifdef CONFIG_FAULT_INJECTION
1842 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1843 * balance_dirty_pages() for some dirty throttling pause
1846 int nr_dirtied_pause
;
1847 unsigned long dirty_paused_when
; /* start of a write-and-pause period */
1849 #ifdef CONFIG_LATENCYTOP
1850 int latency_record_count
;
1851 struct latency_record latency_record
[LT_SAVECOUNT
];
1854 * time slack values; these are used to round up poll() and
1855 * select() etc timeout values. These are in nanoseconds.
1858 u64 default_timer_slack_ns
;
1861 unsigned int kasan_depth
;
1863 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1864 /* Index of current stored address in ret_stack */
1866 /* Stack of return addresses for return function tracing */
1867 struct ftrace_ret_stack
*ret_stack
;
1868 /* time stamp for last schedule */
1869 unsigned long long ftrace_timestamp
;
1871 * Number of functions that haven't been traced
1872 * because of depth overrun.
1874 atomic_t trace_overrun
;
1875 /* Pause for the tracing */
1876 atomic_t tracing_graph_pause
;
1878 #ifdef CONFIG_TRACING
1879 /* state flags for use by tracers */
1880 unsigned long trace
;
1881 /* bitmask and counter of trace recursion */
1882 unsigned long trace_recursion
;
1883 #endif /* CONFIG_TRACING */
1885 /* Coverage collection mode enabled for this task (0 if disabled). */
1886 enum kcov_mode kcov_mode
;
1887 /* Size of the kcov_area. */
1889 /* Buffer for coverage collection. */
1891 /* kcov desciptor wired with this task or NULL. */
1895 struct mem_cgroup
*memcg_in_oom
;
1896 gfp_t memcg_oom_gfp_mask
;
1897 int memcg_oom_order
;
1899 /* number of pages to reclaim on returning to userland */
1900 unsigned int memcg_nr_pages_over_high
;
1902 #ifdef CONFIG_UPROBES
1903 struct uprobe_task
*utask
;
1905 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1906 unsigned int sequential_io
;
1907 unsigned int sequential_io_avg
;
1909 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
1910 unsigned long task_state_change
;
1912 int pagefault_disabled
;
1914 struct task_struct
*oom_reaper_list
;
1916 /* CPU-specific state of this task */
1917 struct thread_struct thread
;
1919 * WARNING: on x86, 'thread_struct' contains a variable-sized
1920 * structure. It *MUST* be at the end of 'task_struct'.
1922 * Do not put anything below here!
1926 #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
1927 extern int arch_task_struct_size __read_mostly
;
1929 # define arch_task_struct_size (sizeof(struct task_struct))
1932 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1933 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1935 static inline int tsk_nr_cpus_allowed(struct task_struct
*p
)
1937 return p
->nr_cpus_allowed
;
1940 #define TNF_MIGRATED 0x01
1941 #define TNF_NO_GROUP 0x02
1942 #define TNF_SHARED 0x04
1943 #define TNF_FAULT_LOCAL 0x08
1944 #define TNF_MIGRATE_FAIL 0x10
1946 #ifdef CONFIG_NUMA_BALANCING
1947 extern void task_numa_fault(int last_node
, int node
, int pages
, int flags
);
1948 extern pid_t
task_numa_group_id(struct task_struct
*p
);
1949 extern void set_numabalancing_state(bool enabled
);
1950 extern void task_numa_free(struct task_struct
*p
);
1951 extern bool should_numa_migrate_memory(struct task_struct
*p
, struct page
*page
,
1952 int src_nid
, int dst_cpu
);
1954 static inline void task_numa_fault(int last_node
, int node
, int pages
,
1958 static inline pid_t
task_numa_group_id(struct task_struct
*p
)
1962 static inline void set_numabalancing_state(bool enabled
)
1965 static inline void task_numa_free(struct task_struct
*p
)
1968 static inline bool should_numa_migrate_memory(struct task_struct
*p
,
1969 struct page
*page
, int src_nid
, int dst_cpu
)
1975 static inline struct pid
*task_pid(struct task_struct
*task
)
1977 return task
->pids
[PIDTYPE_PID
].pid
;
1980 static inline struct pid
*task_tgid(struct task_struct
*task
)
1982 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1986 * Without tasklist or rcu lock it is not safe to dereference
1987 * the result of task_pgrp/task_session even if task == current,
1988 * we can race with another thread doing sys_setsid/sys_setpgid.
1990 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1992 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1995 static inline struct pid
*task_session(struct task_struct
*task
)
1997 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
2000 struct pid_namespace
;
2003 * the helpers to get the task's different pids as they are seen
2004 * from various namespaces
2006 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
2007 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
2009 * task_xid_nr_ns() : id seen from the ns specified;
2011 * set_task_vxid() : assigns a virtual id to a task;
2013 * see also pid_nr() etc in include/linux/pid.h
2015 pid_t
__task_pid_nr_ns(struct task_struct
*task
, enum pid_type type
,
2016 struct pid_namespace
*ns
);
2018 static inline pid_t
task_pid_nr(struct task_struct
*tsk
)
2023 static inline pid_t
task_pid_nr_ns(struct task_struct
*tsk
,
2024 struct pid_namespace
*ns
)
2026 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, ns
);
2029 static inline pid_t
task_pid_vnr(struct task_struct
*tsk
)
2031 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, NULL
);
2035 static inline pid_t
task_tgid_nr(struct task_struct
*tsk
)
2040 pid_t
task_tgid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
2042 static inline pid_t
task_tgid_vnr(struct task_struct
*tsk
)
2044 return pid_vnr(task_tgid(tsk
));
2048 static inline int pid_alive(const struct task_struct
*p
);
2049 static inline pid_t
task_ppid_nr_ns(const struct task_struct
*tsk
, struct pid_namespace
*ns
)
2055 pid
= task_tgid_nr_ns(rcu_dereference(tsk
->real_parent
), ns
);
2061 static inline pid_t
task_ppid_nr(const struct task_struct
*tsk
)
2063 return task_ppid_nr_ns(tsk
, &init_pid_ns
);
2066 static inline pid_t
task_pgrp_nr_ns(struct task_struct
*tsk
,
2067 struct pid_namespace
*ns
)
2069 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, ns
);
2072 static inline pid_t
task_pgrp_vnr(struct task_struct
*tsk
)
2074 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, NULL
);
2078 static inline pid_t
task_session_nr_ns(struct task_struct
*tsk
,
2079 struct pid_namespace
*ns
)
2081 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, ns
);
2084 static inline pid_t
task_session_vnr(struct task_struct
*tsk
)
2086 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, NULL
);
2089 /* obsolete, do not use */
2090 static inline pid_t
task_pgrp_nr(struct task_struct
*tsk
)
2092 return task_pgrp_nr_ns(tsk
, &init_pid_ns
);
2096 * pid_alive - check that a task structure is not stale
2097 * @p: Task structure to be checked.
2099 * Test if a process is not yet dead (at most zombie state)
2100 * If pid_alive fails, then pointers within the task structure
2101 * can be stale and must not be dereferenced.
2103 * Return: 1 if the process is alive. 0 otherwise.
2105 static inline int pid_alive(const struct task_struct
*p
)
2107 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
2111 * is_global_init - check if a task structure is init. Since init
2112 * is free to have sub-threads we need to check tgid.
2113 * @tsk: Task structure to be checked.
2115 * Check if a task structure is the first user space task the kernel created.
2117 * Return: 1 if the task structure is init. 0 otherwise.
2119 static inline int is_global_init(struct task_struct
*tsk
)
2121 return task_tgid_nr(tsk
) == 1;
2124 extern struct pid
*cad_pid
;
2126 extern void free_task(struct task_struct
*tsk
);
2127 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
2129 extern void __put_task_struct(struct task_struct
*t
);
2131 static inline void put_task_struct(struct task_struct
*t
)
2133 if (atomic_dec_and_test(&t
->usage
))
2134 __put_task_struct(t
);
2137 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
2138 extern void task_cputime(struct task_struct
*t
,
2139 cputime_t
*utime
, cputime_t
*stime
);
2140 extern void task_cputime_scaled(struct task_struct
*t
,
2141 cputime_t
*utimescaled
, cputime_t
*stimescaled
);
2142 extern cputime_t
task_gtime(struct task_struct
*t
);
2144 static inline void task_cputime(struct task_struct
*t
,
2145 cputime_t
*utime
, cputime_t
*stime
)
2153 static inline void task_cputime_scaled(struct task_struct
*t
,
2154 cputime_t
*utimescaled
,
2155 cputime_t
*stimescaled
)
2158 *utimescaled
= t
->utimescaled
;
2160 *stimescaled
= t
->stimescaled
;
2163 static inline cputime_t
task_gtime(struct task_struct
*t
)
2168 extern void task_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
2169 extern void thread_group_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
2174 #define PF_EXITING 0x00000004 /* getting shut down */
2175 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
2176 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
2177 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
2178 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
2179 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
2180 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
2181 #define PF_DUMPCORE 0x00000200 /* dumped core */
2182 #define PF_SIGNALED 0x00000400 /* killed by a signal */
2183 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
2184 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
2185 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
2186 #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */
2187 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
2188 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
2189 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
2190 #define PF_KSWAPD 0x00040000 /* I am kswapd */
2191 #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */
2192 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
2193 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
2194 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
2195 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
2196 #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */
2197 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
2198 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
2199 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
2200 #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */
2203 * Only the _current_ task can read/write to tsk->flags, but other
2204 * tasks can access tsk->flags in readonly mode for example
2205 * with tsk_used_math (like during threaded core dumping).
2206 * There is however an exception to this rule during ptrace
2207 * or during fork: the ptracer task is allowed to write to the
2208 * child->flags of its traced child (same goes for fork, the parent
2209 * can write to the child->flags), because we're guaranteed the
2210 * child is not running and in turn not changing child->flags
2211 * at the same time the parent does it.
2213 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
2214 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
2215 #define clear_used_math() clear_stopped_child_used_math(current)
2216 #define set_used_math() set_stopped_child_used_math(current)
2217 #define conditional_stopped_child_used_math(condition, child) \
2218 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
2219 #define conditional_used_math(condition) \
2220 conditional_stopped_child_used_math(condition, current)
2221 #define copy_to_stopped_child_used_math(child) \
2222 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
2223 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
2224 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
2225 #define used_math() tsk_used_math(current)
2227 /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags
2228 * __GFP_FS is also cleared as it implies __GFP_IO.
2230 static inline gfp_t
memalloc_noio_flags(gfp_t flags
)
2232 if (unlikely(current
->flags
& PF_MEMALLOC_NOIO
))
2233 flags
&= ~(__GFP_IO
| __GFP_FS
);
2237 static inline unsigned int memalloc_noio_save(void)
2239 unsigned int flags
= current
->flags
& PF_MEMALLOC_NOIO
;
2240 current
->flags
|= PF_MEMALLOC_NOIO
;
2244 static inline void memalloc_noio_restore(unsigned int flags
)
2246 current
->flags
= (current
->flags
& ~PF_MEMALLOC_NOIO
) | flags
;
2249 /* Per-process atomic flags. */
2250 #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */
2251 #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */
2252 #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */
2253 #define PFA_LMK_WAITING 3 /* Lowmemorykiller is waiting */
2256 #define TASK_PFA_TEST(name, func) \
2257 static inline bool task_##func(struct task_struct *p) \
2258 { return test_bit(PFA_##name, &p->atomic_flags); }
2259 #define TASK_PFA_SET(name, func) \
2260 static inline void task_set_##func(struct task_struct *p) \
2261 { set_bit(PFA_##name, &p->atomic_flags); }
2262 #define TASK_PFA_CLEAR(name, func) \
2263 static inline void task_clear_##func(struct task_struct *p) \
2264 { clear_bit(PFA_##name, &p->atomic_flags); }
2266 TASK_PFA_TEST(NO_NEW_PRIVS
, no_new_privs
)
2267 TASK_PFA_SET(NO_NEW_PRIVS
, no_new_privs
)
2269 TASK_PFA_TEST(SPREAD_PAGE
, spread_page
)
2270 TASK_PFA_SET(SPREAD_PAGE
, spread_page
)
2271 TASK_PFA_CLEAR(SPREAD_PAGE
, spread_page
)
2273 TASK_PFA_TEST(SPREAD_SLAB
, spread_slab
)
2274 TASK_PFA_SET(SPREAD_SLAB
, spread_slab
)
2275 TASK_PFA_CLEAR(SPREAD_SLAB
, spread_slab
)
2277 TASK_PFA_TEST(LMK_WAITING
, lmk_waiting
)
2278 TASK_PFA_SET(LMK_WAITING
, lmk_waiting
)
2281 * task->jobctl flags
2283 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
2285 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
2286 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
2287 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
2288 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
2289 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
2290 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
2291 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
2293 #define JOBCTL_STOP_DEQUEUED (1UL << JOBCTL_STOP_DEQUEUED_BIT)
2294 #define JOBCTL_STOP_PENDING (1UL << JOBCTL_STOP_PENDING_BIT)
2295 #define JOBCTL_STOP_CONSUME (1UL << JOBCTL_STOP_CONSUME_BIT)
2296 #define JOBCTL_TRAP_STOP (1UL << JOBCTL_TRAP_STOP_BIT)
2297 #define JOBCTL_TRAP_NOTIFY (1UL << JOBCTL_TRAP_NOTIFY_BIT)
2298 #define JOBCTL_TRAPPING (1UL << JOBCTL_TRAPPING_BIT)
2299 #define JOBCTL_LISTENING (1UL << JOBCTL_LISTENING_BIT)
2301 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
2302 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
2304 extern bool task_set_jobctl_pending(struct task_struct
*task
,
2305 unsigned long mask
);
2306 extern void task_clear_jobctl_trapping(struct task_struct
*task
);
2307 extern void task_clear_jobctl_pending(struct task_struct
*task
,
2308 unsigned long mask
);
2310 static inline void rcu_copy_process(struct task_struct
*p
)
2312 #ifdef CONFIG_PREEMPT_RCU
2313 p
->rcu_read_lock_nesting
= 0;
2314 p
->rcu_read_unlock_special
.s
= 0;
2315 p
->rcu_blocked_node
= NULL
;
2316 INIT_LIST_HEAD(&p
->rcu_node_entry
);
2317 #endif /* #ifdef CONFIG_PREEMPT_RCU */
2318 #ifdef CONFIG_TASKS_RCU
2319 p
->rcu_tasks_holdout
= false;
2320 INIT_LIST_HEAD(&p
->rcu_tasks_holdout_list
);
2321 p
->rcu_tasks_idle_cpu
= -1;
2322 #endif /* #ifdef CONFIG_TASKS_RCU */
2325 static inline void tsk_restore_flags(struct task_struct
*task
,
2326 unsigned long orig_flags
, unsigned long flags
)
2328 task
->flags
&= ~flags
;
2329 task
->flags
|= orig_flags
& flags
;
2332 extern int cpuset_cpumask_can_shrink(const struct cpumask
*cur
,
2333 const struct cpumask
*trial
);
2334 extern int task_can_attach(struct task_struct
*p
,
2335 const struct cpumask
*cs_cpus_allowed
);
2337 extern void do_set_cpus_allowed(struct task_struct
*p
,
2338 const struct cpumask
*new_mask
);
2340 extern int set_cpus_allowed_ptr(struct task_struct
*p
,
2341 const struct cpumask
*new_mask
);
2343 static inline void do_set_cpus_allowed(struct task_struct
*p
,
2344 const struct cpumask
*new_mask
)
2347 static inline int set_cpus_allowed_ptr(struct task_struct
*p
,
2348 const struct cpumask
*new_mask
)
2350 if (!cpumask_test_cpu(0, new_mask
))
2356 #ifdef CONFIG_NO_HZ_COMMON
2357 void calc_load_enter_idle(void);
2358 void calc_load_exit_idle(void);
2360 static inline void calc_load_enter_idle(void) { }
2361 static inline void calc_load_exit_idle(void) { }
2362 #endif /* CONFIG_NO_HZ_COMMON */
2365 * Do not use outside of architecture code which knows its limitations.
2367 * sched_clock() has no promise of monotonicity or bounded drift between
2368 * CPUs, use (which you should not) requires disabling IRQs.
2370 * Please use one of the three interfaces below.
2372 extern unsigned long long notrace
sched_clock(void);
2374 * See the comment in kernel/sched/clock.c
2376 extern u64
running_clock(void);
2377 extern u64
sched_clock_cpu(int cpu
);
2380 extern void sched_clock_init(void);
2382 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
2383 static inline void sched_clock_tick(void)
2387 static inline void sched_clock_idle_sleep_event(void)
2391 static inline void sched_clock_idle_wakeup_event(u64 delta_ns
)
2395 static inline u64
cpu_clock(int cpu
)
2397 return sched_clock();
2400 static inline u64
local_clock(void)
2402 return sched_clock();
2406 * Architectures can set this to 1 if they have specified
2407 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
2408 * but then during bootup it turns out that sched_clock()
2409 * is reliable after all:
2411 extern int sched_clock_stable(void);
2412 extern void set_sched_clock_stable(void);
2413 extern void clear_sched_clock_stable(void);
2415 extern void sched_clock_tick(void);
2416 extern void sched_clock_idle_sleep_event(void);
2417 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
2420 * As outlined in clock.c, provides a fast, high resolution, nanosecond
2421 * time source that is monotonic per cpu argument and has bounded drift
2424 * ######################### BIG FAT WARNING ##########################
2425 * # when comparing cpu_clock(i) to cpu_clock(j) for i != j, time can #
2426 * # go backwards !! #
2427 * ####################################################################
2429 static inline u64
cpu_clock(int cpu
)
2431 return sched_clock_cpu(cpu
);
2434 static inline u64
local_clock(void)
2436 return sched_clock_cpu(raw_smp_processor_id());
2440 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
2442 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
2443 * The reason for this explicit opt-in is not to have perf penalty with
2444 * slow sched_clocks.
2446 extern void enable_sched_clock_irqtime(void);
2447 extern void disable_sched_clock_irqtime(void);
2449 static inline void enable_sched_clock_irqtime(void) {}
2450 static inline void disable_sched_clock_irqtime(void) {}
2453 extern unsigned long long
2454 task_sched_runtime(struct task_struct
*task
);
2456 /* sched_exec is called by processes performing an exec */
2458 extern void sched_exec(void);
2460 #define sched_exec() {}
2463 extern void sched_clock_idle_sleep_event(void);
2464 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
2466 #ifdef CONFIG_HOTPLUG_CPU
2467 extern void idle_task_exit(void);
2469 static inline void idle_task_exit(void) {}
2472 #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
2473 extern void wake_up_nohz_cpu(int cpu
);
2475 static inline void wake_up_nohz_cpu(int cpu
) { }
2478 #ifdef CONFIG_NO_HZ_FULL
2479 extern u64
scheduler_tick_max_deferment(void);
2482 #ifdef CONFIG_SCHED_AUTOGROUP
2483 extern void sched_autogroup_create_attach(struct task_struct
*p
);
2484 extern void sched_autogroup_detach(struct task_struct
*p
);
2485 extern void sched_autogroup_fork(struct signal_struct
*sig
);
2486 extern void sched_autogroup_exit(struct signal_struct
*sig
);
2487 #ifdef CONFIG_PROC_FS
2488 extern void proc_sched_autogroup_show_task(struct task_struct
*p
, struct seq_file
*m
);
2489 extern int proc_sched_autogroup_set_nice(struct task_struct
*p
, int nice
);
2492 static inline void sched_autogroup_create_attach(struct task_struct
*p
) { }
2493 static inline void sched_autogroup_detach(struct task_struct
*p
) { }
2494 static inline void sched_autogroup_fork(struct signal_struct
*sig
) { }
2495 static inline void sched_autogroup_exit(struct signal_struct
*sig
) { }
2498 extern int yield_to(struct task_struct
*p
, bool preempt
);
2499 extern void set_user_nice(struct task_struct
*p
, long nice
);
2500 extern int task_prio(const struct task_struct
*p
);
2502 * task_nice - return the nice value of a given task.
2503 * @p: the task in question.
2505 * Return: The nice value [ -20 ... 0 ... 19 ].
2507 static inline int task_nice(const struct task_struct
*p
)
2509 return PRIO_TO_NICE((p
)->static_prio
);
2511 extern int can_nice(const struct task_struct
*p
, const int nice
);
2512 extern int task_curr(const struct task_struct
*p
);
2513 extern int idle_cpu(int cpu
);
2514 extern int sched_setscheduler(struct task_struct
*, int,
2515 const struct sched_param
*);
2516 extern int sched_setscheduler_nocheck(struct task_struct
*, int,
2517 const struct sched_param
*);
2518 extern int sched_setattr(struct task_struct
*,
2519 const struct sched_attr
*);
2520 extern struct task_struct
*idle_task(int cpu
);
2522 * is_idle_task - is the specified task an idle task?
2523 * @p: the task in question.
2525 * Return: 1 if @p is an idle task. 0 otherwise.
2527 static inline bool is_idle_task(const struct task_struct
*p
)
2531 extern struct task_struct
*curr_task(int cpu
);
2532 extern void set_curr_task(int cpu
, struct task_struct
*p
);
2536 union thread_union
{
2537 struct thread_info thread_info
;
2538 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
2541 #ifndef __HAVE_ARCH_KSTACK_END
2542 static inline int kstack_end(void *addr
)
2544 /* Reliable end of stack detection:
2545 * Some APM bios versions misalign the stack
2547 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
2551 extern union thread_union init_thread_union
;
2552 extern struct task_struct init_task
;
2554 extern struct mm_struct init_mm
;
2556 extern struct pid_namespace init_pid_ns
;
2559 * find a task by one of its numerical ids
2561 * find_task_by_pid_ns():
2562 * finds a task by its pid in the specified namespace
2563 * find_task_by_vpid():
2564 * finds a task by its virtual pid
2566 * see also find_vpid() etc in include/linux/pid.h
2569 extern struct task_struct
*find_task_by_vpid(pid_t nr
);
2570 extern struct task_struct
*find_task_by_pid_ns(pid_t nr
,
2571 struct pid_namespace
*ns
);
2573 /* per-UID process charging. */
2574 extern struct user_struct
* alloc_uid(kuid_t
);
2575 static inline struct user_struct
*get_uid(struct user_struct
*u
)
2577 atomic_inc(&u
->__count
);
2580 extern void free_uid(struct user_struct
*);
2582 #include <asm/current.h>
2584 extern void xtime_update(unsigned long ticks
);
2586 extern int wake_up_state(struct task_struct
*tsk
, unsigned int state
);
2587 extern int wake_up_process(struct task_struct
*tsk
);
2588 extern void wake_up_new_task(struct task_struct
*tsk
);
2590 extern void kick_process(struct task_struct
*tsk
);
2592 static inline void kick_process(struct task_struct
*tsk
) { }
2594 extern int sched_fork(unsigned long clone_flags
, struct task_struct
*p
);
2595 extern void sched_dead(struct task_struct
*p
);
2597 extern void proc_caches_init(void);
2598 extern void flush_signals(struct task_struct
*);
2599 extern void ignore_signals(struct task_struct
*);
2600 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
2601 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
2603 static inline int kernel_dequeue_signal(siginfo_t
*info
)
2605 struct task_struct
*tsk
= current
;
2609 spin_lock_irq(&tsk
->sighand
->siglock
);
2610 ret
= dequeue_signal(tsk
, &tsk
->blocked
, info
?: &__info
);
2611 spin_unlock_irq(&tsk
->sighand
->siglock
);
2616 static inline void kernel_signal_stop(void)
2618 spin_lock_irq(¤t
->sighand
->siglock
);
2619 if (current
->jobctl
& JOBCTL_STOP_DEQUEUED
)
2620 __set_current_state(TASK_STOPPED
);
2621 spin_unlock_irq(¤t
->sighand
->siglock
);
2626 extern void release_task(struct task_struct
* p
);
2627 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
2628 extern int force_sigsegv(int, struct task_struct
*);
2629 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
2630 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
2631 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
2632 extern int kill_pid_info_as_cred(int, struct siginfo
*, struct pid
*,
2633 const struct cred
*, u32
);
2634 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
2635 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
2636 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
2637 extern __must_check
bool do_notify_parent(struct task_struct
*, int);
2638 extern void __wake_up_parent(struct task_struct
*p
, struct task_struct
*parent
);
2639 extern void force_sig(int, struct task_struct
*);
2640 extern int send_sig(int, struct task_struct
*, int);
2641 extern int zap_other_threads(struct task_struct
*p
);
2642 extern struct sigqueue
*sigqueue_alloc(void);
2643 extern void sigqueue_free(struct sigqueue
*);
2644 extern int send_sigqueue(struct sigqueue
*, struct task_struct
*, int group
);
2645 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
2647 static inline void restore_saved_sigmask(void)
2649 if (test_and_clear_restore_sigmask())
2650 __set_current_blocked(¤t
->saved_sigmask
);
2653 static inline sigset_t
*sigmask_to_save(void)
2655 sigset_t
*res
= ¤t
->blocked
;
2656 if (unlikely(test_restore_sigmask()))
2657 res
= ¤t
->saved_sigmask
;
2661 static inline int kill_cad_pid(int sig
, int priv
)
2663 return kill_pid(cad_pid
, sig
, priv
);
2666 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2667 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2668 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2669 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2672 * True if we are on the alternate signal stack.
2674 static inline int on_sig_stack(unsigned long sp
)
2677 * If the signal stack is SS_AUTODISARM then, by construction, we
2678 * can't be on the signal stack unless user code deliberately set
2679 * SS_AUTODISARM when we were already on it.
2681 * This improves reliability: if user state gets corrupted such that
2682 * the stack pointer points very close to the end of the signal stack,
2683 * then this check will enable the signal to be handled anyway.
2685 if (current
->sas_ss_flags
& SS_AUTODISARM
)
2688 #ifdef CONFIG_STACK_GROWSUP
2689 return sp
>= current
->sas_ss_sp
&&
2690 sp
- current
->sas_ss_sp
< current
->sas_ss_size
;
2692 return sp
> current
->sas_ss_sp
&&
2693 sp
- current
->sas_ss_sp
<= current
->sas_ss_size
;
2697 static inline int sas_ss_flags(unsigned long sp
)
2699 if (!current
->sas_ss_size
)
2702 return on_sig_stack(sp
) ? SS_ONSTACK
: 0;
2705 static inline void sas_ss_reset(struct task_struct
*p
)
2709 p
->sas_ss_flags
= SS_DISABLE
;
2712 static inline unsigned long sigsp(unsigned long sp
, struct ksignal
*ksig
)
2714 if (unlikely((ksig
->ka
.sa
.sa_flags
& SA_ONSTACK
)) && ! sas_ss_flags(sp
))
2715 #ifdef CONFIG_STACK_GROWSUP
2716 return current
->sas_ss_sp
;
2718 return current
->sas_ss_sp
+ current
->sas_ss_size
;
2724 * Routines for handling mm_structs
2726 extern struct mm_struct
* mm_alloc(void);
2728 /* mmdrop drops the mm and the page tables */
2729 extern void __mmdrop(struct mm_struct
*);
2730 static inline void mmdrop(struct mm_struct
*mm
)
2732 if (unlikely(atomic_dec_and_test(&mm
->mm_count
)))
2736 static inline bool mmget_not_zero(struct mm_struct
*mm
)
2738 return atomic_inc_not_zero(&mm
->mm_users
);
2741 /* mmput gets rid of the mappings and all user-space */
2742 extern void mmput(struct mm_struct
*);
2743 /* same as above but performs the slow path from the async kontext. Can
2744 * be called from the atomic context as well
2746 extern void mmput_async(struct mm_struct
*);
2748 /* Grab a reference to a task's mm, if it is not already going away */
2749 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
2751 * Grab a reference to a task's mm, if it is not already going away
2752 * and ptrace_may_access with the mode parameter passed to it
2755 extern struct mm_struct
*mm_access(struct task_struct
*task
, unsigned int mode
);
2756 /* Remove the current tasks stale references to the old mm_struct */
2757 extern void mm_release(struct task_struct
*, struct mm_struct
*);
2759 #ifdef CONFIG_HAVE_COPY_THREAD_TLS
2760 extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
2761 struct task_struct
*, unsigned long);
2763 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2764 struct task_struct
*);
2766 /* Architectures that haven't opted into copy_thread_tls get the tls argument
2767 * via pt_regs, so ignore the tls argument passed via C. */
2768 static inline int copy_thread_tls(
2769 unsigned long clone_flags
, unsigned long sp
, unsigned long arg
,
2770 struct task_struct
*p
, unsigned long tls
)
2772 return copy_thread(clone_flags
, sp
, arg
, p
);
2775 extern void flush_thread(void);
2777 #ifdef CONFIG_HAVE_EXIT_THREAD
2778 extern void exit_thread(struct task_struct
*tsk
);
2780 static inline void exit_thread(struct task_struct
*tsk
)
2785 extern void exit_files(struct task_struct
*);
2786 extern void __cleanup_sighand(struct sighand_struct
*);
2788 extern void exit_itimers(struct signal_struct
*);
2789 extern void flush_itimer_signals(void);
2791 extern void do_group_exit(int);
2793 extern int do_execve(struct filename
*,
2794 const char __user
* const __user
*,
2795 const char __user
* const __user
*);
2796 extern int do_execveat(int, struct filename
*,
2797 const char __user
* const __user
*,
2798 const char __user
* const __user
*,
2800 extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user
*, int __user
*, unsigned long);
2801 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user
*, int __user
*);
2802 struct task_struct
*fork_idle(int);
2803 extern pid_t
kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
);
2805 extern void __set_task_comm(struct task_struct
*tsk
, const char *from
, bool exec
);
2806 static inline void set_task_comm(struct task_struct
*tsk
, const char *from
)
2808 __set_task_comm(tsk
, from
, false);
2810 extern char *get_task_comm(char *to
, struct task_struct
*tsk
);
2813 void scheduler_ipi(void);
2814 extern unsigned long wait_task_inactive(struct task_struct
*, long match_state
);
2816 static inline void scheduler_ipi(void) { }
2817 static inline unsigned long wait_task_inactive(struct task_struct
*p
,
2824 #define tasklist_empty() \
2825 list_empty(&init_task.tasks)
2827 #define next_task(p) \
2828 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2830 #define for_each_process(p) \
2831 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2833 extern bool current_is_single_threaded(void);
2836 * Careful: do_each_thread/while_each_thread is a double loop so
2837 * 'break' will not work as expected - use goto instead.
2839 #define do_each_thread(g, t) \
2840 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2842 #define while_each_thread(g, t) \
2843 while ((t = next_thread(t)) != g)
2845 #define __for_each_thread(signal, t) \
2846 list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
2848 #define for_each_thread(p, t) \
2849 __for_each_thread((p)->signal, t)
2851 /* Careful: this is a double loop, 'break' won't work as expected. */
2852 #define for_each_process_thread(p, t) \
2853 for_each_process(p) for_each_thread(p, t)
2855 static inline int get_nr_threads(struct task_struct
*tsk
)
2857 return tsk
->signal
->nr_threads
;
2860 static inline bool thread_group_leader(struct task_struct
*p
)
2862 return p
->exit_signal
>= 0;
2865 /* Do to the insanities of de_thread it is possible for a process
2866 * to have the pid of the thread group leader without actually being
2867 * the thread group leader. For iteration through the pids in proc
2868 * all we care about is that we have a task with the appropriate
2869 * pid, we don't actually care if we have the right task.
2871 static inline bool has_group_leader_pid(struct task_struct
*p
)
2873 return task_pid(p
) == p
->signal
->leader_pid
;
2877 bool same_thread_group(struct task_struct
*p1
, struct task_struct
*p2
)
2879 return p1
->signal
== p2
->signal
;
2882 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
2884 return list_entry_rcu(p
->thread_group
.next
,
2885 struct task_struct
, thread_group
);
2888 static inline int thread_group_empty(struct task_struct
*p
)
2890 return list_empty(&p
->thread_group
);
2893 #define delay_group_leader(p) \
2894 (thread_group_leader(p) && !thread_group_empty(p))
2897 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2898 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2899 * pins the final release of task.io_context. Also protects ->cpuset and
2900 * ->cgroup.subsys[]. And ->vfork_done.
2902 * Nests both inside and outside of read_lock(&tasklist_lock).
2903 * It must not be nested with write_lock_irq(&tasklist_lock),
2904 * neither inside nor outside.
2906 static inline void task_lock(struct task_struct
*p
)
2908 spin_lock(&p
->alloc_lock
);
2911 static inline void task_unlock(struct task_struct
*p
)
2913 spin_unlock(&p
->alloc_lock
);
2916 extern struct sighand_struct
*__lock_task_sighand(struct task_struct
*tsk
,
2917 unsigned long *flags
);
2919 static inline struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
2920 unsigned long *flags
)
2922 struct sighand_struct
*ret
;
2924 ret
= __lock_task_sighand(tsk
, flags
);
2925 (void)__cond_lock(&tsk
->sighand
->siglock
, ret
);
2929 static inline void unlock_task_sighand(struct task_struct
*tsk
,
2930 unsigned long *flags
)
2932 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
2936 * threadgroup_change_begin - mark the beginning of changes to a threadgroup
2937 * @tsk: task causing the changes
2939 * All operations which modify a threadgroup - a new thread joining the
2940 * group, death of a member thread (the assertion of PF_EXITING) and
2941 * exec(2) dethreading the process and replacing the leader - are wrapped
2942 * by threadgroup_change_{begin|end}(). This is to provide a place which
2943 * subsystems needing threadgroup stability can hook into for
2946 static inline void threadgroup_change_begin(struct task_struct
*tsk
)
2949 cgroup_threadgroup_change_begin(tsk
);
2953 * threadgroup_change_end - mark the end of changes to a threadgroup
2954 * @tsk: task causing the changes
2956 * See threadgroup_change_begin().
2958 static inline void threadgroup_change_end(struct task_struct
*tsk
)
2960 cgroup_threadgroup_change_end(tsk
);
2963 #ifndef __HAVE_THREAD_FUNCTIONS
2965 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2966 #define task_stack_page(task) ((task)->stack)
2968 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
2970 *task_thread_info(p
) = *task_thread_info(org
);
2971 task_thread_info(p
)->task
= p
;
2975 * Return the address of the last usable long on the stack.
2977 * When the stack grows down, this is just above the thread
2978 * info struct. Going any lower will corrupt the threadinfo.
2980 * When the stack grows up, this is the highest address.
2981 * Beyond that position, we corrupt data on the next page.
2983 static inline unsigned long *end_of_stack(struct task_struct
*p
)
2985 #ifdef CONFIG_STACK_GROWSUP
2986 return (unsigned long *)((unsigned long)task_thread_info(p
) + THREAD_SIZE
) - 1;
2988 return (unsigned long *)(task_thread_info(p
) + 1);
2993 #define task_stack_end_corrupted(task) \
2994 (*(end_of_stack(task)) != STACK_END_MAGIC)
2996 static inline int object_is_on_stack(void *obj
)
2998 void *stack
= task_stack_page(current
);
3000 return (obj
>= stack
) && (obj
< (stack
+ THREAD_SIZE
));
3003 extern void thread_info_cache_init(void);
3005 #ifdef CONFIG_DEBUG_STACK_USAGE
3006 static inline unsigned long stack_not_used(struct task_struct
*p
)
3008 unsigned long *n
= end_of_stack(p
);
3010 do { /* Skip over canary */
3011 # ifdef CONFIG_STACK_GROWSUP
3018 # ifdef CONFIG_STACK_GROWSUP
3019 return (unsigned long)end_of_stack(p
) - (unsigned long)n
;
3021 return (unsigned long)n
- (unsigned long)end_of_stack(p
);
3025 extern void set_task_stack_end_magic(struct task_struct
*tsk
);
3027 /* set thread flags in other task's structures
3028 * - see asm/thread_info.h for TIF_xxxx flags available
3030 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
3032 set_ti_thread_flag(task_thread_info(tsk
), flag
);
3035 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
3037 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
3040 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
3042 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
3045 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
3047 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
3050 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
3052 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
3055 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
3057 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
3060 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
3062 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
3065 static inline int test_tsk_need_resched(struct task_struct
*tsk
)
3067 return unlikely(test_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
));
3070 static inline int restart_syscall(void)
3072 set_tsk_thread_flag(current
, TIF_SIGPENDING
);
3073 return -ERESTARTNOINTR
;
3076 static inline int signal_pending(struct task_struct
*p
)
3078 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
3081 static inline int __fatal_signal_pending(struct task_struct
*p
)
3083 return unlikely(sigismember(&p
->pending
.signal
, SIGKILL
));
3086 static inline int fatal_signal_pending(struct task_struct
*p
)
3088 return signal_pending(p
) && __fatal_signal_pending(p
);
3091 static inline int signal_pending_state(long state
, struct task_struct
*p
)
3093 if (!(state
& (TASK_INTERRUPTIBLE
| TASK_WAKEKILL
)))
3095 if (!signal_pending(p
))
3098 return (state
& TASK_INTERRUPTIBLE
) || __fatal_signal_pending(p
);
3102 * cond_resched() and cond_resched_lock(): latency reduction via
3103 * explicit rescheduling in places that are safe. The return
3104 * value indicates whether a reschedule was done in fact.
3105 * cond_resched_lock() will drop the spinlock before scheduling,
3106 * cond_resched_softirq() will enable bhs before scheduling.
3108 extern int _cond_resched(void);
3110 #define cond_resched() ({ \
3111 ___might_sleep(__FILE__, __LINE__, 0); \
3115 extern int __cond_resched_lock(spinlock_t
*lock
);
3117 #define cond_resched_lock(lock) ({ \
3118 ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\
3119 __cond_resched_lock(lock); \
3122 extern int __cond_resched_softirq(void);
3124 #define cond_resched_softirq() ({ \
3125 ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
3126 __cond_resched_softirq(); \
3129 static inline void cond_resched_rcu(void)
3131 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
3139 * Does a critical section need to be broken due to another
3140 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
3141 * but a general need for low latency)
3143 static inline int spin_needbreak(spinlock_t
*lock
)
3145 #ifdef CONFIG_PREEMPT
3146 return spin_is_contended(lock
);
3153 * Idle thread specific functions to determine the need_resched
3156 #ifdef TIF_POLLING_NRFLAG
3157 static inline int tsk_is_polling(struct task_struct
*p
)
3159 return test_tsk_thread_flag(p
, TIF_POLLING_NRFLAG
);
3162 static inline void __current_set_polling(void)
3164 set_thread_flag(TIF_POLLING_NRFLAG
);
3167 static inline bool __must_check
current_set_polling_and_test(void)
3169 __current_set_polling();
3172 * Polling state must be visible before we test NEED_RESCHED,
3173 * paired by resched_curr()
3175 smp_mb__after_atomic();
3177 return unlikely(tif_need_resched());
3180 static inline void __current_clr_polling(void)
3182 clear_thread_flag(TIF_POLLING_NRFLAG
);
3185 static inline bool __must_check
current_clr_polling_and_test(void)
3187 __current_clr_polling();
3190 * Polling state must be visible before we test NEED_RESCHED,
3191 * paired by resched_curr()
3193 smp_mb__after_atomic();
3195 return unlikely(tif_need_resched());
3199 static inline int tsk_is_polling(struct task_struct
*p
) { return 0; }
3200 static inline void __current_set_polling(void) { }
3201 static inline void __current_clr_polling(void) { }
3203 static inline bool __must_check
current_set_polling_and_test(void)
3205 return unlikely(tif_need_resched());
3207 static inline bool __must_check
current_clr_polling_and_test(void)
3209 return unlikely(tif_need_resched());
3213 static inline void current_clr_polling(void)
3215 __current_clr_polling();
3218 * Ensure we check TIF_NEED_RESCHED after we clear the polling bit.
3219 * Once the bit is cleared, we'll get IPIs with every new
3220 * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also
3223 smp_mb(); /* paired with resched_curr() */
3225 preempt_fold_need_resched();
3228 static __always_inline
bool need_resched(void)
3230 return unlikely(tif_need_resched());
3234 * Thread group CPU time accounting.
3236 void thread_group_cputime(struct task_struct
*tsk
, struct task_cputime
*times
);
3237 void thread_group_cputimer(struct task_struct
*tsk
, struct task_cputime
*times
);
3240 * Reevaluate whether the task has signals pending delivery.
3241 * Wake the task if so.
3242 * This is required every time the blocked sigset_t changes.
3243 * callers must hold sighand->siglock.
3245 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
3246 extern void recalc_sigpending(void);
3248 extern void signal_wake_up_state(struct task_struct
*t
, unsigned int state
);
3250 static inline void signal_wake_up(struct task_struct
*t
, bool resume
)
3252 signal_wake_up_state(t
, resume
? TASK_WAKEKILL
: 0);
3254 static inline void ptrace_signal_wake_up(struct task_struct
*t
, bool resume
)
3256 signal_wake_up_state(t
, resume
? __TASK_TRACED
: 0);
3260 * Wrappers for p->thread_info->cpu access. No-op on UP.
3264 static inline unsigned int task_cpu(const struct task_struct
*p
)
3266 return task_thread_info(p
)->cpu
;
3269 static inline int task_node(const struct task_struct
*p
)
3271 return cpu_to_node(task_cpu(p
));
3274 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
3278 static inline unsigned int task_cpu(const struct task_struct
*p
)
3283 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
3287 #endif /* CONFIG_SMP */
3289 extern long sched_setaffinity(pid_t pid
, const struct cpumask
*new_mask
);
3290 extern long sched_getaffinity(pid_t pid
, struct cpumask
*mask
);
3292 #ifdef CONFIG_CGROUP_SCHED
3293 extern struct task_group root_task_group
;
3294 #endif /* CONFIG_CGROUP_SCHED */
3296 extern int task_can_switch_user(struct user_struct
*up
,
3297 struct task_struct
*tsk
);
3299 #ifdef CONFIG_TASK_XACCT
3300 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
3302 tsk
->ioac
.rchar
+= amt
;
3305 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
3307 tsk
->ioac
.wchar
+= amt
;
3310 static inline void inc_syscr(struct task_struct
*tsk
)
3315 static inline void inc_syscw(struct task_struct
*tsk
)
3320 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
3324 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
3328 static inline void inc_syscr(struct task_struct
*tsk
)
3332 static inline void inc_syscw(struct task_struct
*tsk
)
3337 #ifndef TASK_SIZE_OF
3338 #define TASK_SIZE_OF(tsk) TASK_SIZE
3342 extern void mm_update_next_owner(struct mm_struct
*mm
);
3344 static inline void mm_update_next_owner(struct mm_struct
*mm
)
3347 #endif /* CONFIG_MEMCG */
3349 static inline unsigned long task_rlimit(const struct task_struct
*tsk
,
3352 return READ_ONCE(tsk
->signal
->rlim
[limit
].rlim_cur
);
3355 static inline unsigned long task_rlimit_max(const struct task_struct
*tsk
,
3358 return READ_ONCE(tsk
->signal
->rlim
[limit
].rlim_max
);
3361 static inline unsigned long rlimit(unsigned int limit
)
3363 return task_rlimit(current
, limit
);
3366 static inline unsigned long rlimit_max(unsigned int limit
)
3368 return task_rlimit_max(current
, limit
);
3371 #ifdef CONFIG_CPU_FREQ
3372 struct update_util_data
{
3373 void (*func
)(struct update_util_data
*data
,
3374 u64 time
, unsigned long util
, unsigned long max
);
3377 void cpufreq_add_update_util_hook(int cpu
, struct update_util_data
*data
,
3378 void (*func
)(struct update_util_data
*data
, u64 time
,
3379 unsigned long util
, unsigned long max
));
3380 void cpufreq_remove_update_util_hook(int cpu
);
3381 #endif /* CONFIG_CPU_FREQ */