4 #include <uapi/linux/sched.h>
6 #include <linux/sched/prio.h>
13 #include <asm/param.h> /* for HZ */
15 #include <linux/capability.h>
16 #include <linux/threads.h>
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/timex.h>
20 #include <linux/jiffies.h>
21 #include <linux/plist.h>
22 #include <linux/rbtree.h>
23 #include <linux/thread_info.h>
24 #include <linux/cpumask.h>
25 #include <linux/errno.h>
26 #include <linux/nodemask.h>
27 #include <linux/mm_types.h>
28 #include <linux/preempt_mask.h>
31 #include <asm/ptrace.h>
32 #include <asm/cputime.h>
34 #include <linux/smp.h>
35 #include <linux/sem.h>
36 #include <linux/signal.h>
37 #include <linux/compiler.h>
38 #include <linux/completion.h>
39 #include <linux/pid.h>
40 #include <linux/percpu.h>
41 #include <linux/topology.h>
42 #include <linux/proportions.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/task_io_accounting.h>
54 #include <linux/latencytop.h>
55 #include <linux/cred.h>
56 #include <linux/llist.h>
57 #include <linux/uidgid.h>
58 #include <linux/gfp.h>
60 #include <asm/processor.h>
62 #define SCHED_ATTR_SIZE_VER0 48 /* sizeof first published struct */
65 * Extended scheduling parameters data structure.
67 * This is needed because the original struct sched_param can not be
68 * altered without introducing ABI issues with legacy applications
69 * (e.g., in sched_getparam()).
71 * However, the possibility of specifying more than just a priority for
72 * the tasks may be useful for a wide variety of application fields, e.g.,
73 * multimedia, streaming, automation and control, and many others.
75 * This variant (sched_attr) is meant at describing a so-called
76 * sporadic time-constrained task. In such model a task is specified by:
77 * - the activation period or minimum instance inter-arrival time;
78 * - the maximum (or average, depending on the actual scheduling
79 * discipline) computation time of all instances, a.k.a. runtime;
80 * - the deadline (relative to the actual activation time) of each
82 * Very briefly, a periodic (sporadic) task asks for the execution of
83 * some specific computation --which is typically called an instance--
84 * (at most) every period. Moreover, each instance typically lasts no more
85 * than the runtime and must be completed by time instant t equal to
86 * the instance activation time + the deadline.
88 * This is reflected by the actual fields of the sched_attr structure:
90 * @size size of the structure, for fwd/bwd compat.
92 * @sched_policy task's scheduling policy
93 * @sched_flags for customizing the scheduler behaviour
94 * @sched_nice task's nice value (SCHED_NORMAL/BATCH)
95 * @sched_priority task's static priority (SCHED_FIFO/RR)
96 * @sched_deadline representative of the task's deadline
97 * @sched_runtime representative of the task's runtime
98 * @sched_period representative of the task's period
100 * Given this task model, there are a multiplicity of scheduling algorithms
101 * and policies, that can be used to ensure all the tasks will make their
102 * timing constraints.
104 * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the
105 * only user of this new interface. More information about the algorithm
106 * available in the scheduling class file or in Documentation/.
114 /* SCHED_NORMAL, SCHED_BATCH */
117 /* SCHED_FIFO, SCHED_RR */
127 struct futex_pi_state
;
128 struct robust_list_head
;
131 struct perf_event_context
;
135 * List of flags we want to share for kernel threads,
136 * if only because they are not used by them anyway.
138 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
141 * These are the constant used to fake the fixed-point load-average
142 * counting. Some notes:
143 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
144 * a load-average precision of 10 bits integer + 11 bits fractional
145 * - if you want to count load-averages more often, you need more
146 * precision, or rounding will get you. With 2-second counting freq,
147 * the EXP_n values would be 1981, 2034 and 2043 if still using only
150 extern unsigned long avenrun
[]; /* Load averages */
151 extern void get_avenrun(unsigned long *loads
, unsigned long offset
, int shift
);
153 #define FSHIFT 11 /* nr of bits of precision */
154 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
155 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
156 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
157 #define EXP_5 2014 /* 1/exp(5sec/5min) */
158 #define EXP_15 2037 /* 1/exp(5sec/15min) */
160 #define CALC_LOAD(load,exp,n) \
162 load += n*(FIXED_1-exp); \
165 extern unsigned long total_forks
;
166 extern int nr_threads
;
167 DECLARE_PER_CPU(unsigned long, process_counts
);
168 extern int nr_processes(void);
169 extern unsigned long nr_running(void);
170 extern unsigned long nr_iowait(void);
171 extern unsigned long nr_iowait_cpu(int cpu
);
172 extern unsigned long this_cpu_load(void);
175 extern void calc_global_load(unsigned long ticks
);
176 extern void update_cpu_load_nohz(void);
178 extern unsigned long get_parent_ip(unsigned long addr
);
180 extern void dump_cpu_task(int cpu
);
185 #ifdef CONFIG_SCHED_DEBUG
186 extern void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
);
187 extern void proc_sched_set_task(struct task_struct
*p
);
189 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
);
193 * Task state bitmask. NOTE! These bits are also
194 * encoded in fs/proc/array.c: get_task_state().
196 * We have two separate sets of flags: task->state
197 * is about runnability, while task->exit_state are
198 * about the task exiting. Confusing, but this way
199 * modifying one set can't modify the other one by
202 #define TASK_RUNNING 0
203 #define TASK_INTERRUPTIBLE 1
204 #define TASK_UNINTERRUPTIBLE 2
205 #define __TASK_STOPPED 4
206 #define __TASK_TRACED 8
207 /* in tsk->exit_state */
208 #define EXIT_ZOMBIE 16
210 /* in tsk->state again */
212 #define TASK_WAKEKILL 128
213 #define TASK_WAKING 256
214 #define TASK_PARKED 512
215 #define TASK_STATE_MAX 1024
217 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
219 extern char ___assert_task_state
[1 - 2*!!(
220 sizeof(TASK_STATE_TO_CHAR_STR
)-1 != ilog2(TASK_STATE_MAX
)+1)];
222 /* Convenience macros for the sake of set_task_state */
223 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
224 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
225 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
227 /* Convenience macros for the sake of wake_up */
228 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
229 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
231 /* get_task_state() */
232 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
233 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
234 __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD)
236 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
237 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
238 #define task_is_stopped_or_traced(task) \
239 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
240 #define task_contributes_to_load(task) \
241 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
242 (task->flags & PF_FROZEN) == 0)
244 #define __set_task_state(tsk, state_value) \
245 do { (tsk)->state = (state_value); } while (0)
246 #define set_task_state(tsk, state_value) \
247 set_mb((tsk)->state, (state_value))
250 * set_current_state() includes a barrier so that the write of current->state
251 * is correctly serialised wrt the caller's subsequent test of whether to
254 * set_current_state(TASK_UNINTERRUPTIBLE);
255 * if (do_i_need_to_sleep())
258 * If the caller does not need such serialisation then use __set_current_state()
260 #define __set_current_state(state_value) \
261 do { current->state = (state_value); } while (0)
262 #define set_current_state(state_value) \
263 set_mb(current->state, (state_value))
265 /* Task command name length */
266 #define TASK_COMM_LEN 16
268 #include <linux/spinlock.h>
271 * This serializes "schedule()" and also protects
272 * the run-queue from deletions/modifications (but
273 * _adding_ to the beginning of the run-queue has
276 extern rwlock_t tasklist_lock
;
277 extern spinlock_t mmlist_lock
;
281 #ifdef CONFIG_PROVE_RCU
282 extern int lockdep_tasklist_lock_is_held(void);
283 #endif /* #ifdef CONFIG_PROVE_RCU */
285 extern void sched_init(void);
286 extern void sched_init_smp(void);
287 extern asmlinkage
void schedule_tail(struct task_struct
*prev
);
288 extern void init_idle(struct task_struct
*idle
, int cpu
);
289 extern void init_idle_bootup_task(struct task_struct
*idle
);
291 extern int runqueue_is_locked(int cpu
);
293 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
294 extern void nohz_balance_enter_idle(int cpu
);
295 extern void set_cpu_sd_state_idle(void);
296 extern int get_nohz_timer_target(void);
298 static inline void nohz_balance_enter_idle(int cpu
) { }
299 static inline void set_cpu_sd_state_idle(void) { }
303 * Only dump TASK_* tasks. (0 for all tasks)
305 extern void show_state_filter(unsigned long state_filter
);
307 static inline void show_state(void)
309 show_state_filter(0);
312 extern void show_regs(struct pt_regs
*);
315 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
316 * task), SP is the stack pointer of the first frame that should be shown in the back
317 * trace (or NULL if the entire call-chain of the task should be shown).
319 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
321 void io_schedule(void);
322 long io_schedule_timeout(long timeout
);
324 extern void cpu_init (void);
325 extern void trap_init(void);
326 extern void update_process_times(int user
);
327 extern void scheduler_tick(void);
329 extern void sched_show_task(struct task_struct
*p
);
331 #ifdef CONFIG_LOCKUP_DETECTOR
332 extern void touch_softlockup_watchdog(void);
333 extern void touch_softlockup_watchdog_sync(void);
334 extern void touch_all_softlockup_watchdogs(void);
335 extern int proc_dowatchdog_thresh(struct ctl_table
*table
, int write
,
337 size_t *lenp
, loff_t
*ppos
);
338 extern unsigned int softlockup_panic
;
339 void lockup_detector_init(void);
341 static inline void touch_softlockup_watchdog(void)
344 static inline void touch_softlockup_watchdog_sync(void)
347 static inline void touch_all_softlockup_watchdogs(void)
350 static inline void lockup_detector_init(void)
355 #ifdef CONFIG_DETECT_HUNG_TASK
356 void reset_hung_task_detector(void);
358 static inline void reset_hung_task_detector(void)
363 /* Attach to any functions which should be ignored in wchan output. */
364 #define __sched __attribute__((__section__(".sched.text")))
366 /* Linker adds these: start and end of __sched functions */
367 extern char __sched_text_start
[], __sched_text_end
[];
369 /* Is this address in the __sched functions? */
370 extern int in_sched_functions(unsigned long addr
);
372 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
373 extern signed long schedule_timeout(signed long timeout
);
374 extern signed long schedule_timeout_interruptible(signed long timeout
);
375 extern signed long schedule_timeout_killable(signed long timeout
);
376 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
377 asmlinkage
void schedule(void);
378 extern void schedule_preempt_disabled(void);
381 struct user_namespace
;
384 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
386 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
387 unsigned long, unsigned long);
389 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
390 unsigned long len
, unsigned long pgoff
,
391 unsigned long flags
);
393 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
) {}
396 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */
397 #define SUID_DUMP_USER 1 /* Dump as user of process */
398 #define SUID_DUMP_ROOT 2 /* Dump as root */
402 /* for SUID_DUMP_* above */
403 #define MMF_DUMPABLE_BITS 2
404 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
406 extern void set_dumpable(struct mm_struct
*mm
, int value
);
408 * This returns the actual value of the suid_dumpable flag. For things
409 * that are using this for checking for privilege transitions, it must
410 * test against SUID_DUMP_USER rather than treating it as a boolean
413 static inline int __get_dumpable(unsigned long mm_flags
)
415 return mm_flags
& MMF_DUMPABLE_MASK
;
418 static inline int get_dumpable(struct mm_struct
*mm
)
420 return __get_dumpable(mm
->flags
);
423 /* coredump filter bits */
424 #define MMF_DUMP_ANON_PRIVATE 2
425 #define MMF_DUMP_ANON_SHARED 3
426 #define MMF_DUMP_MAPPED_PRIVATE 4
427 #define MMF_DUMP_MAPPED_SHARED 5
428 #define MMF_DUMP_ELF_HEADERS 6
429 #define MMF_DUMP_HUGETLB_PRIVATE 7
430 #define MMF_DUMP_HUGETLB_SHARED 8
432 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
433 #define MMF_DUMP_FILTER_BITS 7
434 #define MMF_DUMP_FILTER_MASK \
435 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
436 #define MMF_DUMP_FILTER_DEFAULT \
437 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
438 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
440 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
441 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
443 # define MMF_DUMP_MASK_DEFAULT_ELF 0
445 /* leave room for more dump flags */
446 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
447 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
448 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
450 #define MMF_HAS_UPROBES 19 /* has uprobes */
451 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
453 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
455 struct sighand_struct
{
457 struct k_sigaction action
[_NSIG
];
459 wait_queue_head_t signalfd_wqh
;
462 struct pacct_struct
{
465 unsigned long ac_mem
;
466 cputime_t ac_utime
, ac_stime
;
467 unsigned long ac_minflt
, ac_majflt
;
478 * struct cputime - snaphsot of system and user cputime
479 * @utime: time spent in user mode
480 * @stime: time spent in system mode
482 * Gathers a generic snapshot of user and system time.
490 * struct task_cputime - collected CPU time counts
491 * @utime: time spent in user mode, in &cputime_t units
492 * @stime: time spent in kernel mode, in &cputime_t units
493 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
495 * This is an extension of struct cputime that includes the total runtime
496 * spent by the task from the scheduler point of view.
498 * As a result, this structure groups together three kinds of CPU time
499 * that are tracked for threads and thread groups. Most things considering
500 * CPU time want to group these counts together and treat all three
501 * of them in parallel.
503 struct task_cputime
{
506 unsigned long long sum_exec_runtime
;
508 /* Alternate field names when used to cache expirations. */
509 #define prof_exp stime
510 #define virt_exp utime
511 #define sched_exp sum_exec_runtime
513 #define INIT_CPUTIME \
514 (struct task_cputime) { \
517 .sum_exec_runtime = 0, \
520 #ifdef CONFIG_PREEMPT_COUNT
521 #define PREEMPT_DISABLED (1 + PREEMPT_ENABLED)
523 #define PREEMPT_DISABLED PREEMPT_ENABLED
527 * Disable preemption until the scheduler is running.
528 * Reset by start_kernel()->sched_init()->init_idle().
530 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
531 * before the scheduler is active -- see should_resched().
533 #define INIT_PREEMPT_COUNT (PREEMPT_DISABLED + PREEMPT_ACTIVE)
536 * struct thread_group_cputimer - thread group interval timer counts
537 * @cputime: thread group interval timers.
538 * @running: non-zero when there are timers running and
539 * @cputime receives updates.
540 * @lock: lock for fields in this struct.
542 * This structure contains the version of task_cputime, above, that is
543 * used for thread group CPU timer calculations.
545 struct thread_group_cputimer
{
546 struct task_cputime cputime
;
551 #include <linux/rwsem.h>
555 * NOTE! "signal_struct" does not have its own
556 * locking, because a shared signal_struct always
557 * implies a shared sighand_struct, so locking
558 * sighand_struct is always a proper superset of
559 * the locking of signal_struct.
561 struct signal_struct
{
565 struct list_head thread_head
;
567 wait_queue_head_t wait_chldexit
; /* for wait4() */
569 /* current thread group signal load-balancing target: */
570 struct task_struct
*curr_target
;
572 /* shared signal handling: */
573 struct sigpending shared_pending
;
575 /* thread group exit support */
578 * - notify group_exit_task when ->count is equal to notify_count
579 * - everyone except group_exit_task is stopped during signal delivery
580 * of fatal signals, group_exit_task processes the signal.
583 struct task_struct
*group_exit_task
;
585 /* thread group stop support, overloads group_exit_code too */
586 int group_stop_count
;
587 unsigned int flags
; /* see SIGNAL_* flags below */
590 * PR_SET_CHILD_SUBREAPER marks a process, like a service
591 * manager, to re-parent orphan (double-forking) child processes
592 * to this process instead of 'init'. The service manager is
593 * able to receive SIGCHLD signals and is able to investigate
594 * the process until it calls wait(). All children of this
595 * process will inherit a flag if they should look for a
596 * child_subreaper process at exit.
598 unsigned int is_child_subreaper
:1;
599 unsigned int has_child_subreaper
:1;
601 /* POSIX.1b Interval Timers */
603 struct list_head posix_timers
;
605 /* ITIMER_REAL timer for the process */
606 struct hrtimer real_timer
;
607 struct pid
*leader_pid
;
608 ktime_t it_real_incr
;
611 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
612 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
613 * values are defined to 0 and 1 respectively
615 struct cpu_itimer it
[2];
618 * Thread group totals for process CPU timers.
619 * See thread_group_cputimer(), et al, for details.
621 struct thread_group_cputimer cputimer
;
623 /* Earliest-expiration cache. */
624 struct task_cputime cputime_expires
;
626 struct list_head cpu_timers
[3];
628 struct pid
*tty_old_pgrp
;
630 /* boolean value for session group leader */
633 struct tty_struct
*tty
; /* NULL if no tty */
635 #ifdef CONFIG_SCHED_AUTOGROUP
636 struct autogroup
*autogroup
;
639 * Cumulative resource counters for dead threads in the group,
640 * and for reaped dead child processes forked by this group.
641 * Live threads maintain their own counters and add to these
642 * in __exit_signal, except for the group leader.
644 cputime_t utime
, stime
, cutime
, cstime
;
647 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
648 struct cputime prev_cputime
;
650 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
651 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
652 unsigned long inblock
, oublock
, cinblock
, coublock
;
653 unsigned long maxrss
, cmaxrss
;
654 struct task_io_accounting ioac
;
657 * Cumulative ns of schedule CPU time fo dead threads in the
658 * group, not including a zombie group leader, (This only differs
659 * from jiffies_to_ns(utime + stime) if sched_clock uses something
660 * other than jiffies.)
662 unsigned long long sum_sched_runtime
;
665 * We don't bother to synchronize most readers of this at all,
666 * because there is no reader checking a limit that actually needs
667 * to get both rlim_cur and rlim_max atomically, and either one
668 * alone is a single word that can safely be read normally.
669 * getrlimit/setrlimit use task_lock(current->group_leader) to
670 * protect this instead of the siglock, because they really
671 * have no need to disable irqs.
673 struct rlimit rlim
[RLIM_NLIMITS
];
675 #ifdef CONFIG_BSD_PROCESS_ACCT
676 struct pacct_struct pacct
; /* per-process accounting information */
678 #ifdef CONFIG_TASKSTATS
679 struct taskstats
*stats
;
683 unsigned audit_tty_log_passwd
;
684 struct tty_audit_buf
*tty_audit_buf
;
686 #ifdef CONFIG_CGROUPS
688 * group_rwsem prevents new tasks from entering the threadgroup and
689 * member tasks from exiting,a more specifically, setting of
690 * PF_EXITING. fork and exit paths are protected with this rwsem
691 * using threadgroup_change_begin/end(). Users which require
692 * threadgroup to remain stable should use threadgroup_[un]lock()
693 * which also takes care of exec path. Currently, cgroup is the
696 struct rw_semaphore group_rwsem
;
699 oom_flags_t oom_flags
;
700 short oom_score_adj
; /* OOM kill score adjustment */
701 short oom_score_adj_min
; /* OOM kill score adjustment min value.
702 * Only settable by CAP_SYS_RESOURCE. */
704 struct mutex cred_guard_mutex
; /* guard against foreign influences on
705 * credential calculations
706 * (notably. ptrace) */
710 * Bits in flags field of signal_struct.
712 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
713 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
714 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
715 #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */
717 * Pending notifications to parent.
719 #define SIGNAL_CLD_STOPPED 0x00000010
720 #define SIGNAL_CLD_CONTINUED 0x00000020
721 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
723 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
725 /* If true, all threads except ->group_exit_task have pending SIGKILL */
726 static inline int signal_group_exit(const struct signal_struct
*sig
)
728 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
729 (sig
->group_exit_task
!= NULL
);
733 * Some day this will be a full-fledged user tracking system..
736 atomic_t __count
; /* reference count */
737 atomic_t processes
; /* How many processes does this user have? */
738 atomic_t files
; /* How many open files does this user have? */
739 atomic_t sigpending
; /* How many pending signals does this user have? */
740 #ifdef CONFIG_INOTIFY_USER
741 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
742 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
744 #ifdef CONFIG_FANOTIFY
745 atomic_t fanotify_listeners
;
748 atomic_long_t epoll_watches
; /* The number of file descriptors currently watched */
750 #ifdef CONFIG_POSIX_MQUEUE
751 /* protected by mq_lock */
752 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
754 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
757 struct key
*uid_keyring
; /* UID specific keyring */
758 struct key
*session_keyring
; /* UID's default session keyring */
761 /* Hash table maintenance information */
762 struct hlist_node uidhash_node
;
765 #ifdef CONFIG_PERF_EVENTS
766 atomic_long_t locked_vm
;
770 extern int uids_sysfs_init(void);
772 extern struct user_struct
*find_user(kuid_t
);
774 extern struct user_struct root_user
;
775 #define INIT_USER (&root_user)
778 struct backing_dev_info
;
779 struct reclaim_state
;
781 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
783 /* cumulative counters */
784 unsigned long pcount
; /* # of times run on this cpu */
785 unsigned long long run_delay
; /* time spent waiting on a runqueue */
788 unsigned long long last_arrival
,/* when we last ran on a cpu */
789 last_queued
; /* when we were last queued to run */
791 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
793 #ifdef CONFIG_TASK_DELAY_ACCT
794 struct task_delay_info
{
796 unsigned int flags
; /* Private per-task flags */
798 /* For each stat XXX, add following, aligned appropriately
800 * struct timespec XXX_start, XXX_end;
804 * Atomicity of updates to XXX_delay, XXX_count protected by
805 * single lock above (split into XXX_lock if contention is an issue).
809 * XXX_count is incremented on every XXX operation, the delay
810 * associated with the operation is added to XXX_delay.
811 * XXX_delay contains the accumulated delay time in nanoseconds.
813 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
814 u64 blkio_delay
; /* wait for sync block io completion */
815 u64 swapin_delay
; /* wait for swapin block io completion */
816 u32 blkio_count
; /* total count of the number of sync block */
817 /* io operations performed */
818 u32 swapin_count
; /* total count of the number of swapin block */
819 /* io operations performed */
821 struct timespec freepages_start
, freepages_end
;
822 u64 freepages_delay
; /* wait for memory reclaim */
823 u32 freepages_count
; /* total count of memory reclaim */
825 #endif /* CONFIG_TASK_DELAY_ACCT */
827 static inline int sched_info_on(void)
829 #ifdef CONFIG_SCHEDSTATS
831 #elif defined(CONFIG_TASK_DELAY_ACCT)
832 extern int delayacct_on
;
847 * Increase resolution of cpu_power calculations
849 #define SCHED_POWER_SHIFT 10
850 #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
853 * sched-domains (multiprocessor balancing) declarations:
856 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
857 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
858 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
859 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
860 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
861 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
862 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
863 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
864 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
865 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
866 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
867 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
868 #define SD_NUMA 0x4000 /* cross-node balancing */
870 extern int __weak
arch_sd_sibiling_asym_packing(void);
872 struct sched_domain_attr
{
873 int relax_domain_level
;
876 #define SD_ATTR_INIT (struct sched_domain_attr) { \
877 .relax_domain_level = -1, \
880 extern int sched_domain_level_max
;
884 struct sched_domain
{
885 /* These fields must be setup */
886 struct sched_domain
*parent
; /* top domain must be null terminated */
887 struct sched_domain
*child
; /* bottom domain must be null terminated */
888 struct sched_group
*groups
; /* the balancing groups of the domain */
889 unsigned long min_interval
; /* Minimum balance interval ms */
890 unsigned long max_interval
; /* Maximum balance interval ms */
891 unsigned int busy_factor
; /* less balancing by factor if busy */
892 unsigned int imbalance_pct
; /* No balance until over watermark */
893 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
894 unsigned int busy_idx
;
895 unsigned int idle_idx
;
896 unsigned int newidle_idx
;
897 unsigned int wake_idx
;
898 unsigned int forkexec_idx
;
899 unsigned int smt_gain
;
901 int nohz_idle
; /* NOHZ IDLE status */
902 int flags
; /* See SD_* */
905 /* Runtime fields. */
906 unsigned long last_balance
; /* init to jiffies. units in jiffies */
907 unsigned int balance_interval
; /* initialise to 1. units in ms. */
908 unsigned int nr_balance_failed
; /* initialise to 0 */
910 /* idle_balance() stats */
911 u64 max_newidle_lb_cost
;
912 unsigned long next_decay_max_lb_cost
;
914 #ifdef CONFIG_SCHEDSTATS
915 /* load_balance() stats */
916 unsigned int lb_count
[CPU_MAX_IDLE_TYPES
];
917 unsigned int lb_failed
[CPU_MAX_IDLE_TYPES
];
918 unsigned int lb_balanced
[CPU_MAX_IDLE_TYPES
];
919 unsigned int lb_imbalance
[CPU_MAX_IDLE_TYPES
];
920 unsigned int lb_gained
[CPU_MAX_IDLE_TYPES
];
921 unsigned int lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
922 unsigned int lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
923 unsigned int lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
925 /* Active load balancing */
926 unsigned int alb_count
;
927 unsigned int alb_failed
;
928 unsigned int alb_pushed
;
930 /* SD_BALANCE_EXEC stats */
931 unsigned int sbe_count
;
932 unsigned int sbe_balanced
;
933 unsigned int sbe_pushed
;
935 /* SD_BALANCE_FORK stats */
936 unsigned int sbf_count
;
937 unsigned int sbf_balanced
;
938 unsigned int sbf_pushed
;
940 /* try_to_wake_up() stats */
941 unsigned int ttwu_wake_remote
;
942 unsigned int ttwu_move_affine
;
943 unsigned int ttwu_move_balance
;
945 #ifdef CONFIG_SCHED_DEBUG
949 void *private; /* used during construction */
950 struct rcu_head rcu
; /* used during destruction */
953 unsigned int span_weight
;
955 * Span of all CPUs in this domain.
957 * NOTE: this field is variable length. (Allocated dynamically
958 * by attaching extra space to the end of the structure,
959 * depending on how many CPUs the kernel has booted up with)
961 unsigned long span
[0];
964 static inline struct cpumask
*sched_domain_span(struct sched_domain
*sd
)
966 return to_cpumask(sd
->span
);
969 extern void partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
970 struct sched_domain_attr
*dattr_new
);
972 /* Allocate an array of sched domains, for partition_sched_domains(). */
973 cpumask_var_t
*alloc_sched_domains(unsigned int ndoms
);
974 void free_sched_domains(cpumask_var_t doms
[], unsigned int ndoms
);
976 bool cpus_share_cache(int this_cpu
, int that_cpu
);
978 #else /* CONFIG_SMP */
980 struct sched_domain_attr
;
983 partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
984 struct sched_domain_attr
*dattr_new
)
988 static inline bool cpus_share_cache(int this_cpu
, int that_cpu
)
993 #endif /* !CONFIG_SMP */
996 struct io_context
; /* See blkdev.h */
999 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1000 extern void prefetch_stack(struct task_struct
*t
);
1002 static inline void prefetch_stack(struct task_struct
*t
) { }
1005 struct audit_context
; /* See audit.c */
1007 struct pipe_inode_info
;
1008 struct uts_namespace
;
1010 struct load_weight
{
1011 unsigned long weight
;
1017 * These sums represent an infinite geometric series and so are bound
1018 * above by 1024/(1-y). Thus we only need a u32 to store them for all
1019 * choices of y < 1-2^(-32)*1024.
1021 u32 runnable_avg_sum
, runnable_avg_period
;
1022 u64 last_runnable_update
;
1024 unsigned long load_avg_contrib
;
1027 #ifdef CONFIG_SCHEDSTATS
1028 struct sched_statistics
{
1038 s64 sum_sleep_runtime
;
1045 u64 nr_migrations_cold
;
1046 u64 nr_failed_migrations_affine
;
1047 u64 nr_failed_migrations_running
;
1048 u64 nr_failed_migrations_hot
;
1049 u64 nr_forced_migrations
;
1052 u64 nr_wakeups_sync
;
1053 u64 nr_wakeups_migrate
;
1054 u64 nr_wakeups_local
;
1055 u64 nr_wakeups_remote
;
1056 u64 nr_wakeups_affine
;
1057 u64 nr_wakeups_affine_attempts
;
1058 u64 nr_wakeups_passive
;
1059 u64 nr_wakeups_idle
;
1063 struct sched_entity
{
1064 struct load_weight load
; /* for load-balancing */
1065 struct rb_node run_node
;
1066 struct list_head group_node
;
1070 u64 sum_exec_runtime
;
1072 u64 prev_sum_exec_runtime
;
1076 #ifdef CONFIG_SCHEDSTATS
1077 struct sched_statistics statistics
;
1080 #ifdef CONFIG_FAIR_GROUP_SCHED
1081 struct sched_entity
*parent
;
1082 /* rq on which this entity is (to be) queued: */
1083 struct cfs_rq
*cfs_rq
;
1084 /* rq "owned" by this entity/group: */
1085 struct cfs_rq
*my_q
;
1089 /* Per-entity load-tracking */
1090 struct sched_avg avg
;
1094 struct sched_rt_entity
{
1095 struct list_head run_list
;
1096 unsigned long timeout
;
1097 unsigned long watchdog_stamp
;
1098 unsigned int time_slice
;
1100 struct sched_rt_entity
*back
;
1101 #ifdef CONFIG_RT_GROUP_SCHED
1102 struct sched_rt_entity
*parent
;
1103 /* rq on which this entity is (to be) queued: */
1104 struct rt_rq
*rt_rq
;
1105 /* rq "owned" by this entity/group: */
1110 struct sched_dl_entity
{
1111 struct rb_node rb_node
;
1114 * Original scheduling parameters. Copied here from sched_attr
1115 * during sched_setscheduler2(), they will remain the same until
1116 * the next sched_setscheduler2().
1118 u64 dl_runtime
; /* maximum runtime for each instance */
1119 u64 dl_deadline
; /* relative deadline of each instance */
1120 u64 dl_period
; /* separation of two instances (period) */
1121 u64 dl_bw
; /* dl_runtime / dl_deadline */
1124 * Actual scheduling parameters. Initialized with the values above,
1125 * they are continously updated during task execution. Note that
1126 * the remaining runtime could be < 0 in case we are in overrun.
1128 s64 runtime
; /* remaining runtime for this instance */
1129 u64 deadline
; /* absolute deadline for this instance */
1130 unsigned int flags
; /* specifying the scheduler behaviour */
1135 * @dl_throttled tells if we exhausted the runtime. If so, the
1136 * task has to wait for a replenishment to be performed at the
1137 * next firing of dl_timer.
1139 * @dl_new tells if a new instance arrived. If so we must
1140 * start executing it with full runtime and reset its absolute
1143 * @dl_boosted tells if we are boosted due to DI. If so we are
1144 * outside bandwidth enforcement mechanism (but only until we
1145 * exit the critical section).
1147 int dl_throttled
, dl_new
, dl_boosted
;
1150 * Bandwidth enforcement timer. Each -deadline task has its
1151 * own bandwidth to be enforced, thus we need one timer per task.
1153 struct hrtimer dl_timer
;
1158 enum perf_event_task_context
{
1159 perf_invalid_context
= -1,
1160 perf_hw_context
= 0,
1162 perf_nr_task_contexts
,
1165 struct task_struct
{
1166 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
1169 unsigned int flags
; /* per process flags, defined below */
1170 unsigned int ptrace
;
1173 struct llist_node wake_entry
;
1175 struct task_struct
*last_wakee
;
1176 unsigned long wakee_flips
;
1177 unsigned long wakee_flip_decay_ts
;
1183 int prio
, static_prio
, normal_prio
;
1184 unsigned int rt_priority
;
1185 const struct sched_class
*sched_class
;
1186 struct sched_entity se
;
1187 struct sched_rt_entity rt
;
1188 #ifdef CONFIG_CGROUP_SCHED
1189 struct task_group
*sched_task_group
;
1191 struct sched_dl_entity dl
;
1193 #ifdef CONFIG_PREEMPT_NOTIFIERS
1194 /* list of struct preempt_notifier: */
1195 struct hlist_head preempt_notifiers
;
1198 #ifdef CONFIG_BLK_DEV_IO_TRACE
1199 unsigned int btrace_seq
;
1202 unsigned int policy
;
1203 int nr_cpus_allowed
;
1204 cpumask_t cpus_allowed
;
1206 #ifdef CONFIG_PREEMPT_RCU
1207 int rcu_read_lock_nesting
;
1208 char rcu_read_unlock_special
;
1209 struct list_head rcu_node_entry
;
1210 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1211 #ifdef CONFIG_TREE_PREEMPT_RCU
1212 struct rcu_node
*rcu_blocked_node
;
1213 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1214 #ifdef CONFIG_RCU_BOOST
1215 struct rt_mutex
*rcu_boost_mutex
;
1216 #endif /* #ifdef CONFIG_RCU_BOOST */
1218 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1219 struct sched_info sched_info
;
1222 struct list_head tasks
;
1224 struct plist_node pushable_tasks
;
1225 struct rb_node pushable_dl_tasks
;
1228 struct mm_struct
*mm
, *active_mm
;
1229 #ifdef CONFIG_COMPAT_BRK
1230 unsigned brk_randomized
:1;
1232 #if defined(SPLIT_RSS_COUNTING)
1233 struct task_rss_stat rss_stat
;
1237 int exit_code
, exit_signal
;
1238 int pdeath_signal
; /* The signal sent when the parent dies */
1239 unsigned int jobctl
; /* JOBCTL_*, siglock protected */
1241 /* Used for emulating ABI behavior of previous Linux versions */
1242 unsigned int personality
;
1244 unsigned in_execve
:1; /* Tell the LSMs that the process is doing an
1246 unsigned in_iowait
:1;
1248 /* task may not gain privileges */
1249 unsigned no_new_privs
:1;
1251 /* Revert to default priority/policy when forking */
1252 unsigned sched_reset_on_fork
:1;
1253 unsigned sched_contributes_to_load
:1;
1258 #ifdef CONFIG_CC_STACKPROTECTOR
1259 /* Canary value for the -fstack-protector gcc feature */
1260 unsigned long stack_canary
;
1263 * pointers to (original) parent process, youngest child, younger sibling,
1264 * older sibling, respectively. (p->father can be replaced with
1265 * p->real_parent->pid)
1267 struct task_struct __rcu
*real_parent
; /* real parent process */
1268 struct task_struct __rcu
*parent
; /* recipient of SIGCHLD, wait4() reports */
1270 * children/sibling forms the list of my natural children
1272 struct list_head children
; /* list of my children */
1273 struct list_head sibling
; /* linkage in my parent's children list */
1274 struct task_struct
*group_leader
; /* threadgroup leader */
1277 * ptraced is the list of tasks this task is using ptrace on.
1278 * This includes both natural children and PTRACE_ATTACH targets.
1279 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1281 struct list_head ptraced
;
1282 struct list_head ptrace_entry
;
1284 /* PID/PID hash table linkage. */
1285 struct pid_link pids
[PIDTYPE_MAX
];
1286 struct list_head thread_group
;
1287 struct list_head thread_node
;
1289 struct completion
*vfork_done
; /* for vfork() */
1290 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
1291 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
1293 cputime_t utime
, stime
, utimescaled
, stimescaled
;
1295 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
1296 struct cputime prev_cputime
;
1298 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1299 seqlock_t vtime_seqlock
;
1300 unsigned long long vtime_snap
;
1305 } vtime_snap_whence
;
1307 unsigned long nvcsw
, nivcsw
; /* context switch counts */
1308 struct timespec start_time
; /* monotonic time */
1309 struct timespec real_start_time
; /* boot based time */
1310 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1311 unsigned long min_flt
, maj_flt
;
1313 struct task_cputime cputime_expires
;
1314 struct list_head cpu_timers
[3];
1316 /* process credentials */
1317 const struct cred __rcu
*real_cred
; /* objective and real subjective task
1318 * credentials (COW) */
1319 const struct cred __rcu
*cred
; /* effective (overridable) subjective task
1320 * credentials (COW) */
1321 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
1322 - access with [gs]et_task_comm (which lock
1323 it with task_lock())
1324 - initialized normally by setup_new_exec */
1325 /* file system info */
1326 int link_count
, total_link_count
;
1327 #ifdef CONFIG_SYSVIPC
1329 struct sysv_sem sysvsem
;
1331 #ifdef CONFIG_DETECT_HUNG_TASK
1332 /* hung task detection */
1333 unsigned long last_switch_count
;
1335 /* CPU-specific state of this task */
1336 struct thread_struct thread
;
1337 /* filesystem information */
1338 struct fs_struct
*fs
;
1339 /* open file information */
1340 struct files_struct
*files
;
1342 struct nsproxy
*nsproxy
;
1343 /* signal handlers */
1344 struct signal_struct
*signal
;
1345 struct sighand_struct
*sighand
;
1347 sigset_t blocked
, real_blocked
;
1348 sigset_t saved_sigmask
; /* restored if set_restore_sigmask() was used */
1349 struct sigpending pending
;
1351 unsigned long sas_ss_sp
;
1353 int (*notifier
)(void *priv
);
1354 void *notifier_data
;
1355 sigset_t
*notifier_mask
;
1356 struct callback_head
*task_works
;
1358 struct audit_context
*audit_context
;
1359 #ifdef CONFIG_AUDITSYSCALL
1361 unsigned int sessionid
;
1363 struct seccomp seccomp
;
1365 /* Thread group tracking */
1368 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1370 spinlock_t alloc_lock
;
1372 /* Protection of the PI data structures: */
1373 raw_spinlock_t pi_lock
;
1375 #ifdef CONFIG_RT_MUTEXES
1376 /* PI waiters blocked on a rt_mutex held by this task */
1377 struct rb_root pi_waiters
;
1378 struct rb_node
*pi_waiters_leftmost
;
1379 /* Deadlock detection and priority inheritance handling */
1380 struct rt_mutex_waiter
*pi_blocked_on
;
1381 /* Top pi_waiters task */
1382 struct task_struct
*pi_top_task
;
1385 #ifdef CONFIG_DEBUG_MUTEXES
1386 /* mutex deadlock detection */
1387 struct mutex_waiter
*blocked_on
;
1389 #ifdef CONFIG_TRACE_IRQFLAGS
1390 unsigned int irq_events
;
1391 unsigned long hardirq_enable_ip
;
1392 unsigned long hardirq_disable_ip
;
1393 unsigned int hardirq_enable_event
;
1394 unsigned int hardirq_disable_event
;
1395 int hardirqs_enabled
;
1396 int hardirq_context
;
1397 unsigned long softirq_disable_ip
;
1398 unsigned long softirq_enable_ip
;
1399 unsigned int softirq_disable_event
;
1400 unsigned int softirq_enable_event
;
1401 int softirqs_enabled
;
1402 int softirq_context
;
1404 #ifdef CONFIG_LOCKDEP
1405 # define MAX_LOCK_DEPTH 48UL
1408 unsigned int lockdep_recursion
;
1409 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1410 gfp_t lockdep_reclaim_gfp
;
1413 /* journalling filesystem info */
1416 /* stacked block device info */
1417 struct bio_list
*bio_list
;
1420 /* stack plugging */
1421 struct blk_plug
*plug
;
1425 struct reclaim_state
*reclaim_state
;
1427 struct backing_dev_info
*backing_dev_info
;
1429 struct io_context
*io_context
;
1431 unsigned long ptrace_message
;
1432 siginfo_t
*last_siginfo
; /* For ptrace use. */
1433 struct task_io_accounting ioac
;
1434 #if defined(CONFIG_TASK_XACCT)
1435 u64 acct_rss_mem1
; /* accumulated rss usage */
1436 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1437 cputime_t acct_timexpd
; /* stime + utime since last update */
1439 #ifdef CONFIG_CPUSETS
1440 nodemask_t mems_allowed
; /* Protected by alloc_lock */
1441 seqcount_t mems_allowed_seq
; /* Seqence no to catch updates */
1442 int cpuset_mem_spread_rotor
;
1443 int cpuset_slab_spread_rotor
;
1445 #ifdef CONFIG_CGROUPS
1446 /* Control Group info protected by css_set_lock */
1447 struct css_set __rcu
*cgroups
;
1448 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1449 struct list_head cg_list
;
1452 struct robust_list_head __user
*robust_list
;
1453 #ifdef CONFIG_COMPAT
1454 struct compat_robust_list_head __user
*compat_robust_list
;
1456 struct list_head pi_state_list
;
1457 struct futex_pi_state
*pi_state_cache
;
1459 #ifdef CONFIG_PERF_EVENTS
1460 struct perf_event_context
*perf_event_ctxp
[perf_nr_task_contexts
];
1461 struct mutex perf_event_mutex
;
1462 struct list_head perf_event_list
;
1465 struct mempolicy
*mempolicy
; /* Protected by alloc_lock */
1467 short pref_node_fork
;
1469 #ifdef CONFIG_NUMA_BALANCING
1471 unsigned int numa_scan_period
;
1472 unsigned int numa_scan_period_max
;
1473 int numa_preferred_nid
;
1474 unsigned long numa_migrate_retry
;
1475 u64 node_stamp
; /* migration stamp */
1476 u64 last_task_numa_placement
;
1477 u64 last_sum_exec_runtime
;
1478 struct callback_head numa_work
;
1480 struct list_head numa_entry
;
1481 struct numa_group
*numa_group
;
1484 * Exponential decaying average of faults on a per-node basis.
1485 * Scheduling placement decisions are made based on the these counts.
1486 * The values remain static for the duration of a PTE scan
1488 unsigned long *numa_faults_memory
;
1489 unsigned long total_numa_faults
;
1492 * numa_faults_buffer records faults per node during the current
1493 * scan window. When the scan completes, the counts in
1494 * numa_faults_memory decay and these values are copied.
1496 unsigned long *numa_faults_buffer_memory
;
1499 * Track the nodes the process was running on when a NUMA hinting
1500 * fault was incurred.
1502 unsigned long *numa_faults_cpu
;
1503 unsigned long *numa_faults_buffer_cpu
;
1506 * numa_faults_locality tracks if faults recorded during the last
1507 * scan window were remote/local. The task scan period is adapted
1508 * based on the locality of the faults with different weights
1509 * depending on whether they were shared or private faults
1511 unsigned long numa_faults_locality
[2];
1513 unsigned long numa_pages_migrated
;
1514 #endif /* CONFIG_NUMA_BALANCING */
1516 struct rcu_head rcu
;
1519 * cache last used pipe for splice
1521 struct pipe_inode_info
*splice_pipe
;
1523 struct page_frag task_frag
;
1525 #ifdef CONFIG_TASK_DELAY_ACCT
1526 struct task_delay_info
*delays
;
1528 #ifdef CONFIG_FAULT_INJECTION
1532 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1533 * balance_dirty_pages() for some dirty throttling pause
1536 int nr_dirtied_pause
;
1537 unsigned long dirty_paused_when
; /* start of a write-and-pause period */
1539 #ifdef CONFIG_LATENCYTOP
1540 int latency_record_count
;
1541 struct latency_record latency_record
[LT_SAVECOUNT
];
1544 * time slack values; these are used to round up poll() and
1545 * select() etc timeout values. These are in nanoseconds.
1547 unsigned long timer_slack_ns
;
1548 unsigned long default_timer_slack_ns
;
1550 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1551 /* Index of current stored address in ret_stack */
1553 /* Stack of return addresses for return function tracing */
1554 struct ftrace_ret_stack
*ret_stack
;
1555 /* time stamp for last schedule */
1556 unsigned long long ftrace_timestamp
;
1558 * Number of functions that haven't been traced
1559 * because of depth overrun.
1561 atomic_t trace_overrun
;
1562 /* Pause for the tracing */
1563 atomic_t tracing_graph_pause
;
1565 #ifdef CONFIG_TRACING
1566 /* state flags for use by tracers */
1567 unsigned long trace
;
1568 /* bitmask and counter of trace recursion */
1569 unsigned long trace_recursion
;
1570 #endif /* CONFIG_TRACING */
1571 #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
1572 struct memcg_batch_info
{
1573 int do_batch
; /* incremented when batch uncharge started */
1574 struct mem_cgroup
*memcg
; /* target memcg of uncharge */
1575 unsigned long nr_pages
; /* uncharged usage */
1576 unsigned long memsw_nr_pages
; /* uncharged mem+swap usage */
1578 unsigned int memcg_kmem_skip_account
;
1579 struct memcg_oom_info
{
1580 struct mem_cgroup
*memcg
;
1583 unsigned int may_oom
:1;
1586 #ifdef CONFIG_UPROBES
1587 struct uprobe_task
*utask
;
1589 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1590 unsigned int sequential_io
;
1591 unsigned int sequential_io_avg
;
1595 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1596 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1598 #define TNF_MIGRATED 0x01
1599 #define TNF_NO_GROUP 0x02
1600 #define TNF_SHARED 0x04
1601 #define TNF_FAULT_LOCAL 0x08
1603 #ifdef CONFIG_NUMA_BALANCING
1604 extern void task_numa_fault(int last_node
, int node
, int pages
, int flags
);
1605 extern pid_t
task_numa_group_id(struct task_struct
*p
);
1606 extern void set_numabalancing_state(bool enabled
);
1607 extern void task_numa_free(struct task_struct
*p
);
1608 extern bool should_numa_migrate_memory(struct task_struct
*p
, struct page
*page
,
1609 int src_nid
, int dst_cpu
);
1611 static inline void task_numa_fault(int last_node
, int node
, int pages
,
1615 static inline pid_t
task_numa_group_id(struct task_struct
*p
)
1619 static inline void set_numabalancing_state(bool enabled
)
1622 static inline void task_numa_free(struct task_struct
*p
)
1625 static inline bool should_numa_migrate_memory(struct task_struct
*p
,
1626 struct page
*page
, int src_nid
, int dst_cpu
)
1632 static inline struct pid
*task_pid(struct task_struct
*task
)
1634 return task
->pids
[PIDTYPE_PID
].pid
;
1637 static inline struct pid
*task_tgid(struct task_struct
*task
)
1639 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1643 * Without tasklist or rcu lock it is not safe to dereference
1644 * the result of task_pgrp/task_session even if task == current,
1645 * we can race with another thread doing sys_setsid/sys_setpgid.
1647 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1649 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1652 static inline struct pid
*task_session(struct task_struct
*task
)
1654 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1657 struct pid_namespace
;
1660 * the helpers to get the task's different pids as they are seen
1661 * from various namespaces
1663 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1664 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1666 * task_xid_nr_ns() : id seen from the ns specified;
1668 * set_task_vxid() : assigns a virtual id to a task;
1670 * see also pid_nr() etc in include/linux/pid.h
1672 pid_t
__task_pid_nr_ns(struct task_struct
*task
, enum pid_type type
,
1673 struct pid_namespace
*ns
);
1675 static inline pid_t
task_pid_nr(struct task_struct
*tsk
)
1680 static inline pid_t
task_pid_nr_ns(struct task_struct
*tsk
,
1681 struct pid_namespace
*ns
)
1683 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, ns
);
1686 static inline pid_t
task_pid_vnr(struct task_struct
*tsk
)
1688 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, NULL
);
1692 static inline pid_t
task_tgid_nr(struct task_struct
*tsk
)
1697 pid_t
task_tgid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1699 static inline pid_t
task_tgid_vnr(struct task_struct
*tsk
)
1701 return pid_vnr(task_tgid(tsk
));
1705 static inline pid_t
task_pgrp_nr_ns(struct task_struct
*tsk
,
1706 struct pid_namespace
*ns
)
1708 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, ns
);
1711 static inline pid_t
task_pgrp_vnr(struct task_struct
*tsk
)
1713 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, NULL
);
1717 static inline pid_t
task_session_nr_ns(struct task_struct
*tsk
,
1718 struct pid_namespace
*ns
)
1720 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, ns
);
1723 static inline pid_t
task_session_vnr(struct task_struct
*tsk
)
1725 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, NULL
);
1728 /* obsolete, do not use */
1729 static inline pid_t
task_pgrp_nr(struct task_struct
*tsk
)
1731 return task_pgrp_nr_ns(tsk
, &init_pid_ns
);
1735 * pid_alive - check that a task structure is not stale
1736 * @p: Task structure to be checked.
1738 * Test if a process is not yet dead (at most zombie state)
1739 * If pid_alive fails, then pointers within the task structure
1740 * can be stale and must not be dereferenced.
1742 * Return: 1 if the process is alive. 0 otherwise.
1744 static inline int pid_alive(struct task_struct
*p
)
1746 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1750 * is_global_init - check if a task structure is init
1751 * @tsk: Task structure to be checked.
1753 * Check if a task structure is the first user space task the kernel created.
1755 * Return: 1 if the task structure is init. 0 otherwise.
1757 static inline int is_global_init(struct task_struct
*tsk
)
1759 return tsk
->pid
== 1;
1762 extern struct pid
*cad_pid
;
1764 extern void free_task(struct task_struct
*tsk
);
1765 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1767 extern void __put_task_struct(struct task_struct
*t
);
1769 static inline void put_task_struct(struct task_struct
*t
)
1771 if (atomic_dec_and_test(&t
->usage
))
1772 __put_task_struct(t
);
1775 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1776 extern void task_cputime(struct task_struct
*t
,
1777 cputime_t
*utime
, cputime_t
*stime
);
1778 extern void task_cputime_scaled(struct task_struct
*t
,
1779 cputime_t
*utimescaled
, cputime_t
*stimescaled
);
1780 extern cputime_t
task_gtime(struct task_struct
*t
);
1782 static inline void task_cputime(struct task_struct
*t
,
1783 cputime_t
*utime
, cputime_t
*stime
)
1791 static inline void task_cputime_scaled(struct task_struct
*t
,
1792 cputime_t
*utimescaled
,
1793 cputime_t
*stimescaled
)
1796 *utimescaled
= t
->utimescaled
;
1798 *stimescaled
= t
->stimescaled
;
1801 static inline cputime_t
task_gtime(struct task_struct
*t
)
1806 extern void task_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
1807 extern void thread_group_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
1812 #define PF_EXITING 0x00000004 /* getting shut down */
1813 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1814 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1815 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1816 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1817 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1818 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1819 #define PF_DUMPCORE 0x00000200 /* dumped core */
1820 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1821 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1822 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1823 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1824 #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */
1825 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1826 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1827 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1828 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1829 #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */
1830 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1831 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1832 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1833 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1834 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1835 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1836 #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */
1837 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1838 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1839 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1840 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1841 #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */
1844 * Only the _current_ task can read/write to tsk->flags, but other
1845 * tasks can access tsk->flags in readonly mode for example
1846 * with tsk_used_math (like during threaded core dumping).
1847 * There is however an exception to this rule during ptrace
1848 * or during fork: the ptracer task is allowed to write to the
1849 * child->flags of its traced child (same goes for fork, the parent
1850 * can write to the child->flags), because we're guaranteed the
1851 * child is not running and in turn not changing child->flags
1852 * at the same time the parent does it.
1854 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1855 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1856 #define clear_used_math() clear_stopped_child_used_math(current)
1857 #define set_used_math() set_stopped_child_used_math(current)
1858 #define conditional_stopped_child_used_math(condition, child) \
1859 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1860 #define conditional_used_math(condition) \
1861 conditional_stopped_child_used_math(condition, current)
1862 #define copy_to_stopped_child_used_math(child) \
1863 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1864 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1865 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1866 #define used_math() tsk_used_math(current)
1868 /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags */
1869 static inline gfp_t
memalloc_noio_flags(gfp_t flags
)
1871 if (unlikely(current
->flags
& PF_MEMALLOC_NOIO
))
1876 static inline unsigned int memalloc_noio_save(void)
1878 unsigned int flags
= current
->flags
& PF_MEMALLOC_NOIO
;
1879 current
->flags
|= PF_MEMALLOC_NOIO
;
1883 static inline void memalloc_noio_restore(unsigned int flags
)
1885 current
->flags
= (current
->flags
& ~PF_MEMALLOC_NOIO
) | flags
;
1889 * task->jobctl flags
1891 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1893 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1894 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1895 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1896 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1897 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1898 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1899 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1901 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1902 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
1903 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
1904 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
1905 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
1906 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
1907 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
1909 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1910 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
1912 extern bool task_set_jobctl_pending(struct task_struct
*task
,
1914 extern void task_clear_jobctl_trapping(struct task_struct
*task
);
1915 extern void task_clear_jobctl_pending(struct task_struct
*task
,
1918 #ifdef CONFIG_PREEMPT_RCU
1920 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1921 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1923 static inline void rcu_copy_process(struct task_struct
*p
)
1925 p
->rcu_read_lock_nesting
= 0;
1926 p
->rcu_read_unlock_special
= 0;
1927 #ifdef CONFIG_TREE_PREEMPT_RCU
1928 p
->rcu_blocked_node
= NULL
;
1929 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1930 #ifdef CONFIG_RCU_BOOST
1931 p
->rcu_boost_mutex
= NULL
;
1932 #endif /* #ifdef CONFIG_RCU_BOOST */
1933 INIT_LIST_HEAD(&p
->rcu_node_entry
);
1938 static inline void rcu_copy_process(struct task_struct
*p
)
1944 static inline void tsk_restore_flags(struct task_struct
*task
,
1945 unsigned long orig_flags
, unsigned long flags
)
1947 task
->flags
&= ~flags
;
1948 task
->flags
|= orig_flags
& flags
;
1952 extern void do_set_cpus_allowed(struct task_struct
*p
,
1953 const struct cpumask
*new_mask
);
1955 extern int set_cpus_allowed_ptr(struct task_struct
*p
,
1956 const struct cpumask
*new_mask
);
1958 static inline void do_set_cpus_allowed(struct task_struct
*p
,
1959 const struct cpumask
*new_mask
)
1962 static inline int set_cpus_allowed_ptr(struct task_struct
*p
,
1963 const struct cpumask
*new_mask
)
1965 if (!cpumask_test_cpu(0, new_mask
))
1971 #ifdef CONFIG_NO_HZ_COMMON
1972 void calc_load_enter_idle(void);
1973 void calc_load_exit_idle(void);
1975 static inline void calc_load_enter_idle(void) { }
1976 static inline void calc_load_exit_idle(void) { }
1977 #endif /* CONFIG_NO_HZ_COMMON */
1979 #ifndef CONFIG_CPUMASK_OFFSTACK
1980 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1982 return set_cpus_allowed_ptr(p
, &new_mask
);
1987 * Do not use outside of architecture code which knows its limitations.
1989 * sched_clock() has no promise of monotonicity or bounded drift between
1990 * CPUs, use (which you should not) requires disabling IRQs.
1992 * Please use one of the three interfaces below.
1994 extern unsigned long long notrace
sched_clock(void);
1996 * See the comment in kernel/sched/clock.c
1998 extern u64
cpu_clock(int cpu
);
1999 extern u64
local_clock(void);
2000 extern u64
sched_clock_cpu(int cpu
);
2003 extern void sched_clock_init(void);
2005 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
2006 static inline void sched_clock_tick(void)
2010 static inline void sched_clock_idle_sleep_event(void)
2014 static inline void sched_clock_idle_wakeup_event(u64 delta_ns
)
2019 * Architectures can set this to 1 if they have specified
2020 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
2021 * but then during bootup it turns out that sched_clock()
2022 * is reliable after all:
2024 extern int sched_clock_stable(void);
2025 extern void set_sched_clock_stable(void);
2026 extern void clear_sched_clock_stable(void);
2028 extern void sched_clock_tick(void);
2029 extern void sched_clock_idle_sleep_event(void);
2030 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
2033 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
2035 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
2036 * The reason for this explicit opt-in is not to have perf penalty with
2037 * slow sched_clocks.
2039 extern void enable_sched_clock_irqtime(void);
2040 extern void disable_sched_clock_irqtime(void);
2042 static inline void enable_sched_clock_irqtime(void) {}
2043 static inline void disable_sched_clock_irqtime(void) {}
2046 extern unsigned long long
2047 task_sched_runtime(struct task_struct
*task
);
2049 /* sched_exec is called by processes performing an exec */
2051 extern void sched_exec(void);
2053 #define sched_exec() {}
2056 extern void sched_clock_idle_sleep_event(void);
2057 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
2059 #ifdef CONFIG_HOTPLUG_CPU
2060 extern void idle_task_exit(void);
2062 static inline void idle_task_exit(void) {}
2065 #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
2066 extern void wake_up_nohz_cpu(int cpu
);
2068 static inline void wake_up_nohz_cpu(int cpu
) { }
2071 #ifdef CONFIG_NO_HZ_FULL
2072 extern bool sched_can_stop_tick(void);
2073 extern u64
scheduler_tick_max_deferment(void);
2075 static inline bool sched_can_stop_tick(void) { return false; }
2078 #ifdef CONFIG_SCHED_AUTOGROUP
2079 extern void sched_autogroup_create_attach(struct task_struct
*p
);
2080 extern void sched_autogroup_detach(struct task_struct
*p
);
2081 extern void sched_autogroup_fork(struct signal_struct
*sig
);
2082 extern void sched_autogroup_exit(struct signal_struct
*sig
);
2083 #ifdef CONFIG_PROC_FS
2084 extern void proc_sched_autogroup_show_task(struct task_struct
*p
, struct seq_file
*m
);
2085 extern int proc_sched_autogroup_set_nice(struct task_struct
*p
, int nice
);
2088 static inline void sched_autogroup_create_attach(struct task_struct
*p
) { }
2089 static inline void sched_autogroup_detach(struct task_struct
*p
) { }
2090 static inline void sched_autogroup_fork(struct signal_struct
*sig
) { }
2091 static inline void sched_autogroup_exit(struct signal_struct
*sig
) { }
2094 extern bool yield_to(struct task_struct
*p
, bool preempt
);
2095 extern void set_user_nice(struct task_struct
*p
, long nice
);
2096 extern int task_prio(const struct task_struct
*p
);
2098 * task_nice - return the nice value of a given task.
2099 * @p: the task in question.
2101 * Return: The nice value [ -20 ... 0 ... 19 ].
2103 static inline int task_nice(const struct task_struct
*p
)
2105 return PRIO_TO_NICE((p
)->static_prio
);
2107 extern int can_nice(const struct task_struct
*p
, const int nice
);
2108 extern int task_curr(const struct task_struct
*p
);
2109 extern int idle_cpu(int cpu
);
2110 extern int sched_setscheduler(struct task_struct
*, int,
2111 const struct sched_param
*);
2112 extern int sched_setscheduler_nocheck(struct task_struct
*, int,
2113 const struct sched_param
*);
2114 extern int sched_setattr(struct task_struct
*,
2115 const struct sched_attr
*);
2116 extern struct task_struct
*idle_task(int cpu
);
2118 * is_idle_task - is the specified task an idle task?
2119 * @p: the task in question.
2121 * Return: 1 if @p is an idle task. 0 otherwise.
2123 static inline bool is_idle_task(const struct task_struct
*p
)
2127 extern struct task_struct
*curr_task(int cpu
);
2128 extern void set_curr_task(int cpu
, struct task_struct
*p
);
2133 * The default (Linux) execution domain.
2135 extern struct exec_domain default_exec_domain
;
2137 union thread_union
{
2138 struct thread_info thread_info
;
2139 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
2142 #ifndef __HAVE_ARCH_KSTACK_END
2143 static inline int kstack_end(void *addr
)
2145 /* Reliable end of stack detection:
2146 * Some APM bios versions misalign the stack
2148 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
2152 extern union thread_union init_thread_union
;
2153 extern struct task_struct init_task
;
2155 extern struct mm_struct init_mm
;
2157 extern struct pid_namespace init_pid_ns
;
2160 * find a task by one of its numerical ids
2162 * find_task_by_pid_ns():
2163 * finds a task by its pid in the specified namespace
2164 * find_task_by_vpid():
2165 * finds a task by its virtual pid
2167 * see also find_vpid() etc in include/linux/pid.h
2170 extern struct task_struct
*find_task_by_vpid(pid_t nr
);
2171 extern struct task_struct
*find_task_by_pid_ns(pid_t nr
,
2172 struct pid_namespace
*ns
);
2174 /* per-UID process charging. */
2175 extern struct user_struct
* alloc_uid(kuid_t
);
2176 static inline struct user_struct
*get_uid(struct user_struct
*u
)
2178 atomic_inc(&u
->__count
);
2181 extern void free_uid(struct user_struct
*);
2183 #include <asm/current.h>
2185 extern void xtime_update(unsigned long ticks
);
2187 extern int wake_up_state(struct task_struct
*tsk
, unsigned int state
);
2188 extern int wake_up_process(struct task_struct
*tsk
);
2189 extern void wake_up_new_task(struct task_struct
*tsk
);
2191 extern void kick_process(struct task_struct
*tsk
);
2193 static inline void kick_process(struct task_struct
*tsk
) { }
2195 extern int sched_fork(unsigned long clone_flags
, struct task_struct
*p
);
2196 extern void sched_dead(struct task_struct
*p
);
2198 extern void proc_caches_init(void);
2199 extern void flush_signals(struct task_struct
*);
2200 extern void __flush_signals(struct task_struct
*);
2201 extern void ignore_signals(struct task_struct
*);
2202 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
2203 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
2205 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
2207 unsigned long flags
;
2210 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
2211 ret
= dequeue_signal(tsk
, mask
, info
);
2212 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
2217 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
2219 extern void unblock_all_signals(void);
2220 extern void release_task(struct task_struct
* p
);
2221 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
2222 extern int force_sigsegv(int, struct task_struct
*);
2223 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
2224 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
2225 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
2226 extern int kill_pid_info_as_cred(int, struct siginfo
*, struct pid
*,
2227 const struct cred
*, u32
);
2228 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
2229 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
2230 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
2231 extern __must_check
bool do_notify_parent(struct task_struct
*, int);
2232 extern void __wake_up_parent(struct task_struct
*p
, struct task_struct
*parent
);
2233 extern void force_sig(int, struct task_struct
*);
2234 extern int send_sig(int, struct task_struct
*, int);
2235 extern int zap_other_threads(struct task_struct
*p
);
2236 extern struct sigqueue
*sigqueue_alloc(void);
2237 extern void sigqueue_free(struct sigqueue
*);
2238 extern int send_sigqueue(struct sigqueue
*, struct task_struct
*, int group
);
2239 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
2241 static inline void restore_saved_sigmask(void)
2243 if (test_and_clear_restore_sigmask())
2244 __set_current_blocked(¤t
->saved_sigmask
);
2247 static inline sigset_t
*sigmask_to_save(void)
2249 sigset_t
*res
= ¤t
->blocked
;
2250 if (unlikely(test_restore_sigmask()))
2251 res
= ¤t
->saved_sigmask
;
2255 static inline int kill_cad_pid(int sig
, int priv
)
2257 return kill_pid(cad_pid
, sig
, priv
);
2260 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2261 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2262 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2263 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2266 * True if we are on the alternate signal stack.
2268 static inline int on_sig_stack(unsigned long sp
)
2270 #ifdef CONFIG_STACK_GROWSUP
2271 return sp
>= current
->sas_ss_sp
&&
2272 sp
- current
->sas_ss_sp
< current
->sas_ss_size
;
2274 return sp
> current
->sas_ss_sp
&&
2275 sp
- current
->sas_ss_sp
<= current
->sas_ss_size
;
2279 static inline int sas_ss_flags(unsigned long sp
)
2281 return (current
->sas_ss_size
== 0 ? SS_DISABLE
2282 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
2285 static inline unsigned long sigsp(unsigned long sp
, struct ksignal
*ksig
)
2287 if (unlikely((ksig
->ka
.sa
.sa_flags
& SA_ONSTACK
)) && ! sas_ss_flags(sp
))
2288 #ifdef CONFIG_STACK_GROWSUP
2289 return current
->sas_ss_sp
;
2291 return current
->sas_ss_sp
+ current
->sas_ss_size
;
2297 * Routines for handling mm_structs
2299 extern struct mm_struct
* mm_alloc(void);
2301 /* mmdrop drops the mm and the page tables */
2302 extern void __mmdrop(struct mm_struct
*);
2303 static inline void mmdrop(struct mm_struct
* mm
)
2305 if (unlikely(atomic_dec_and_test(&mm
->mm_count
)))
2309 /* mmput gets rid of the mappings and all user-space */
2310 extern void mmput(struct mm_struct
*);
2311 /* Grab a reference to a task's mm, if it is not already going away */
2312 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
2314 * Grab a reference to a task's mm, if it is not already going away
2315 * and ptrace_may_access with the mode parameter passed to it
2318 extern struct mm_struct
*mm_access(struct task_struct
*task
, unsigned int mode
);
2319 /* Remove the current tasks stale references to the old mm_struct */
2320 extern void mm_release(struct task_struct
*, struct mm_struct
*);
2322 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2323 struct task_struct
*);
2324 extern void flush_thread(void);
2325 extern void exit_thread(void);
2327 extern void exit_files(struct task_struct
*);
2328 extern void __cleanup_sighand(struct sighand_struct
*);
2330 extern void exit_itimers(struct signal_struct
*);
2331 extern void flush_itimer_signals(void);
2333 extern void do_group_exit(int);
2335 extern int allow_signal(int);
2336 extern int disallow_signal(int);
2338 extern int do_execve(const char *,
2339 const char __user
* const __user
*,
2340 const char __user
* const __user
*);
2341 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user
*, int __user
*);
2342 struct task_struct
*fork_idle(int);
2343 extern pid_t
kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
);
2345 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
2346 extern char *get_task_comm(char *to
, struct task_struct
*tsk
);
2349 void scheduler_ipi(void);
2350 extern unsigned long wait_task_inactive(struct task_struct
*, long match_state
);
2352 static inline void scheduler_ipi(void) { }
2353 static inline unsigned long wait_task_inactive(struct task_struct
*p
,
2360 #define next_task(p) \
2361 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2363 #define for_each_process(p) \
2364 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2366 extern bool current_is_single_threaded(void);
2369 * Careful: do_each_thread/while_each_thread is a double loop so
2370 * 'break' will not work as expected - use goto instead.
2372 #define do_each_thread(g, t) \
2373 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2375 #define while_each_thread(g, t) \
2376 while ((t = next_thread(t)) != g)
2378 #define __for_each_thread(signal, t) \
2379 list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
2381 #define for_each_thread(p, t) \
2382 __for_each_thread((p)->signal, t)
2384 /* Careful: this is a double loop, 'break' won't work as expected. */
2385 #define for_each_process_thread(p, t) \
2386 for_each_process(p) for_each_thread(p, t)
2388 static inline int get_nr_threads(struct task_struct
*tsk
)
2390 return tsk
->signal
->nr_threads
;
2393 static inline bool thread_group_leader(struct task_struct
*p
)
2395 return p
->exit_signal
>= 0;
2398 /* Do to the insanities of de_thread it is possible for a process
2399 * to have the pid of the thread group leader without actually being
2400 * the thread group leader. For iteration through the pids in proc
2401 * all we care about is that we have a task with the appropriate
2402 * pid, we don't actually care if we have the right task.
2404 static inline bool has_group_leader_pid(struct task_struct
*p
)
2406 return task_pid(p
) == p
->signal
->leader_pid
;
2410 bool same_thread_group(struct task_struct
*p1
, struct task_struct
*p2
)
2412 return p1
->signal
== p2
->signal
;
2415 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
2417 return list_entry_rcu(p
->thread_group
.next
,
2418 struct task_struct
, thread_group
);
2421 static inline int thread_group_empty(struct task_struct
*p
)
2423 return list_empty(&p
->thread_group
);
2426 #define delay_group_leader(p) \
2427 (thread_group_leader(p) && !thread_group_empty(p))
2430 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2431 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2432 * pins the final release of task.io_context. Also protects ->cpuset and
2433 * ->cgroup.subsys[]. And ->vfork_done.
2435 * Nests both inside and outside of read_lock(&tasklist_lock).
2436 * It must not be nested with write_lock_irq(&tasklist_lock),
2437 * neither inside nor outside.
2439 static inline void task_lock(struct task_struct
*p
)
2441 spin_lock(&p
->alloc_lock
);
2444 static inline void task_unlock(struct task_struct
*p
)
2446 spin_unlock(&p
->alloc_lock
);
2449 extern struct sighand_struct
*__lock_task_sighand(struct task_struct
*tsk
,
2450 unsigned long *flags
);
2452 static inline struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
2453 unsigned long *flags
)
2455 struct sighand_struct
*ret
;
2457 ret
= __lock_task_sighand(tsk
, flags
);
2458 (void)__cond_lock(&tsk
->sighand
->siglock
, ret
);
2462 static inline void unlock_task_sighand(struct task_struct
*tsk
,
2463 unsigned long *flags
)
2465 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
2468 #ifdef CONFIG_CGROUPS
2469 static inline void threadgroup_change_begin(struct task_struct
*tsk
)
2471 down_read(&tsk
->signal
->group_rwsem
);
2473 static inline void threadgroup_change_end(struct task_struct
*tsk
)
2475 up_read(&tsk
->signal
->group_rwsem
);
2479 * threadgroup_lock - lock threadgroup
2480 * @tsk: member task of the threadgroup to lock
2482 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2483 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2484 * change ->group_leader/pid. This is useful for cases where the threadgroup
2485 * needs to stay stable across blockable operations.
2487 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2488 * synchronization. While held, no new task will be added to threadgroup
2489 * and no existing live task will have its PF_EXITING set.
2491 * de_thread() does threadgroup_change_{begin|end}() when a non-leader
2492 * sub-thread becomes a new leader.
2494 static inline void threadgroup_lock(struct task_struct
*tsk
)
2496 down_write(&tsk
->signal
->group_rwsem
);
2500 * threadgroup_unlock - unlock threadgroup
2501 * @tsk: member task of the threadgroup to unlock
2503 * Reverse threadgroup_lock().
2505 static inline void threadgroup_unlock(struct task_struct
*tsk
)
2507 up_write(&tsk
->signal
->group_rwsem
);
2510 static inline void threadgroup_change_begin(struct task_struct
*tsk
) {}
2511 static inline void threadgroup_change_end(struct task_struct
*tsk
) {}
2512 static inline void threadgroup_lock(struct task_struct
*tsk
) {}
2513 static inline void threadgroup_unlock(struct task_struct
*tsk
) {}
2516 #ifndef __HAVE_THREAD_FUNCTIONS
2518 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2519 #define task_stack_page(task) ((task)->stack)
2521 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
2523 *task_thread_info(p
) = *task_thread_info(org
);
2524 task_thread_info(p
)->task
= p
;
2527 static inline unsigned long *end_of_stack(struct task_struct
*p
)
2529 return (unsigned long *)(task_thread_info(p
) + 1);
2534 static inline int object_is_on_stack(void *obj
)
2536 void *stack
= task_stack_page(current
);
2538 return (obj
>= stack
) && (obj
< (stack
+ THREAD_SIZE
));
2541 extern void thread_info_cache_init(void);
2543 #ifdef CONFIG_DEBUG_STACK_USAGE
2544 static inline unsigned long stack_not_used(struct task_struct
*p
)
2546 unsigned long *n
= end_of_stack(p
);
2548 do { /* Skip over canary */
2552 return (unsigned long)n
- (unsigned long)end_of_stack(p
);
2556 /* set thread flags in other task's structures
2557 * - see asm/thread_info.h for TIF_xxxx flags available
2559 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2561 set_ti_thread_flag(task_thread_info(tsk
), flag
);
2564 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2566 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2569 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2571 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
2574 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2576 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2579 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2581 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
2584 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
2586 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2589 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
2591 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2594 static inline int test_tsk_need_resched(struct task_struct
*tsk
)
2596 return unlikely(test_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
));
2599 static inline int restart_syscall(void)
2601 set_tsk_thread_flag(current
, TIF_SIGPENDING
);
2602 return -ERESTARTNOINTR
;
2605 static inline int signal_pending(struct task_struct
*p
)
2607 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
2610 static inline int __fatal_signal_pending(struct task_struct
*p
)
2612 return unlikely(sigismember(&p
->pending
.signal
, SIGKILL
));
2615 static inline int fatal_signal_pending(struct task_struct
*p
)
2617 return signal_pending(p
) && __fatal_signal_pending(p
);
2620 static inline int signal_pending_state(long state
, struct task_struct
*p
)
2622 if (!(state
& (TASK_INTERRUPTIBLE
| TASK_WAKEKILL
)))
2624 if (!signal_pending(p
))
2627 return (state
& TASK_INTERRUPTIBLE
) || __fatal_signal_pending(p
);
2631 * cond_resched() and cond_resched_lock(): latency reduction via
2632 * explicit rescheduling in places that are safe. The return
2633 * value indicates whether a reschedule was done in fact.
2634 * cond_resched_lock() will drop the spinlock before scheduling,
2635 * cond_resched_softirq() will enable bhs before scheduling.
2637 extern int _cond_resched(void);
2639 #define cond_resched() ({ \
2640 __might_sleep(__FILE__, __LINE__, 0); \
2644 extern int __cond_resched_lock(spinlock_t
*lock
);
2646 #ifdef CONFIG_PREEMPT_COUNT
2647 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2649 #define PREEMPT_LOCK_OFFSET 0
2652 #define cond_resched_lock(lock) ({ \
2653 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2654 __cond_resched_lock(lock); \
2657 extern int __cond_resched_softirq(void);
2659 #define cond_resched_softirq() ({ \
2660 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2661 __cond_resched_softirq(); \
2664 static inline void cond_resched_rcu(void)
2666 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
2674 * Does a critical section need to be broken due to another
2675 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2676 * but a general need for low latency)
2678 static inline int spin_needbreak(spinlock_t
*lock
)
2680 #ifdef CONFIG_PREEMPT
2681 return spin_is_contended(lock
);
2688 * Idle thread specific functions to determine the need_resched
2689 * polling state. We have two versions, one based on TS_POLLING in
2690 * thread_info.status and one based on TIF_POLLING_NRFLAG in
2694 static inline int tsk_is_polling(struct task_struct
*p
)
2696 return task_thread_info(p
)->status
& TS_POLLING
;
2698 static inline void __current_set_polling(void)
2700 current_thread_info()->status
|= TS_POLLING
;
2703 static inline bool __must_check
current_set_polling_and_test(void)
2705 __current_set_polling();
2708 * Polling state must be visible before we test NEED_RESCHED,
2709 * paired by resched_task()
2713 return unlikely(tif_need_resched());
2716 static inline void __current_clr_polling(void)
2718 current_thread_info()->status
&= ~TS_POLLING
;
2721 static inline bool __must_check
current_clr_polling_and_test(void)
2723 __current_clr_polling();
2726 * Polling state must be visible before we test NEED_RESCHED,
2727 * paired by resched_task()
2731 return unlikely(tif_need_resched());
2733 #elif defined(TIF_POLLING_NRFLAG)
2734 static inline int tsk_is_polling(struct task_struct
*p
)
2736 return test_tsk_thread_flag(p
, TIF_POLLING_NRFLAG
);
2739 static inline void __current_set_polling(void)
2741 set_thread_flag(TIF_POLLING_NRFLAG
);
2744 static inline bool __must_check
current_set_polling_and_test(void)
2746 __current_set_polling();
2749 * Polling state must be visible before we test NEED_RESCHED,
2750 * paired by resched_task()
2752 * XXX: assumes set/clear bit are identical barrier wise.
2754 smp_mb__after_clear_bit();
2756 return unlikely(tif_need_resched());
2759 static inline void __current_clr_polling(void)
2761 clear_thread_flag(TIF_POLLING_NRFLAG
);
2764 static inline bool __must_check
current_clr_polling_and_test(void)
2766 __current_clr_polling();
2769 * Polling state must be visible before we test NEED_RESCHED,
2770 * paired by resched_task()
2772 smp_mb__after_clear_bit();
2774 return unlikely(tif_need_resched());
2778 static inline int tsk_is_polling(struct task_struct
*p
) { return 0; }
2779 static inline void __current_set_polling(void) { }
2780 static inline void __current_clr_polling(void) { }
2782 static inline bool __must_check
current_set_polling_and_test(void)
2784 return unlikely(tif_need_resched());
2786 static inline bool __must_check
current_clr_polling_and_test(void)
2788 return unlikely(tif_need_resched());
2792 static inline void current_clr_polling(void)
2794 __current_clr_polling();
2797 * Ensure we check TIF_NEED_RESCHED after we clear the polling bit.
2798 * Once the bit is cleared, we'll get IPIs with every new
2799 * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also
2802 smp_mb(); /* paired with resched_task() */
2804 preempt_fold_need_resched();
2807 static __always_inline
bool need_resched(void)
2809 return unlikely(tif_need_resched());
2813 * Thread group CPU time accounting.
2815 void thread_group_cputime(struct task_struct
*tsk
, struct task_cputime
*times
);
2816 void thread_group_cputimer(struct task_struct
*tsk
, struct task_cputime
*times
);
2818 static inline void thread_group_cputime_init(struct signal_struct
*sig
)
2820 raw_spin_lock_init(&sig
->cputimer
.lock
);
2824 * Reevaluate whether the task has signals pending delivery.
2825 * Wake the task if so.
2826 * This is required every time the blocked sigset_t changes.
2827 * callers must hold sighand->siglock.
2829 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
2830 extern void recalc_sigpending(void);
2832 extern void signal_wake_up_state(struct task_struct
*t
, unsigned int state
);
2834 static inline void signal_wake_up(struct task_struct
*t
, bool resume
)
2836 signal_wake_up_state(t
, resume
? TASK_WAKEKILL
: 0);
2838 static inline void ptrace_signal_wake_up(struct task_struct
*t
, bool resume
)
2840 signal_wake_up_state(t
, resume
? __TASK_TRACED
: 0);
2844 * Wrappers for p->thread_info->cpu access. No-op on UP.
2848 static inline unsigned int task_cpu(const struct task_struct
*p
)
2850 return task_thread_info(p
)->cpu
;
2853 static inline int task_node(const struct task_struct
*p
)
2855 return cpu_to_node(task_cpu(p
));
2858 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
2862 static inline unsigned int task_cpu(const struct task_struct
*p
)
2867 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
2871 #endif /* CONFIG_SMP */
2873 extern long sched_setaffinity(pid_t pid
, const struct cpumask
*new_mask
);
2874 extern long sched_getaffinity(pid_t pid
, struct cpumask
*mask
);
2876 #ifdef CONFIG_CGROUP_SCHED
2877 extern struct task_group root_task_group
;
2878 #endif /* CONFIG_CGROUP_SCHED */
2880 extern int task_can_switch_user(struct user_struct
*up
,
2881 struct task_struct
*tsk
);
2883 #ifdef CONFIG_TASK_XACCT
2884 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2886 tsk
->ioac
.rchar
+= amt
;
2889 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2891 tsk
->ioac
.wchar
+= amt
;
2894 static inline void inc_syscr(struct task_struct
*tsk
)
2899 static inline void inc_syscw(struct task_struct
*tsk
)
2904 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2908 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2912 static inline void inc_syscr(struct task_struct
*tsk
)
2916 static inline void inc_syscw(struct task_struct
*tsk
)
2921 #ifndef TASK_SIZE_OF
2922 #define TASK_SIZE_OF(tsk) TASK_SIZE
2925 #ifdef CONFIG_MM_OWNER
2926 extern void mm_update_next_owner(struct mm_struct
*mm
);
2927 extern void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
);
2929 static inline void mm_update_next_owner(struct mm_struct
*mm
)
2933 static inline void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
)
2936 #endif /* CONFIG_MM_OWNER */
2938 static inline unsigned long task_rlimit(const struct task_struct
*tsk
,
2941 return ACCESS_ONCE(tsk
->signal
->rlim
[limit
].rlim_cur
);
2944 static inline unsigned long task_rlimit_max(const struct task_struct
*tsk
,
2947 return ACCESS_ONCE(tsk
->signal
->rlim
[limit
].rlim_max
);
2950 static inline unsigned long rlimit(unsigned int limit
)
2952 return task_rlimit(current
, limit
);
2955 static inline unsigned long rlimit_max(unsigned int limit
)
2957 return task_rlimit_max(current
, limit
);