7 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
8 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
9 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
10 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
11 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
12 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
13 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
14 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
15 #define CLONE_THREAD 0x00010000 /* Same thread group? */
16 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
17 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
18 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
19 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
20 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
21 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
22 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
23 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
24 /* 0x02000000 was previously the unused CLONE_STOPPED (Start in stopped state)
25 and is now available for re-use. */
26 #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
27 #define CLONE_NEWIPC 0x08000000 /* New ipcs */
28 #define CLONE_NEWUSER 0x10000000 /* New user namespace */
29 #define CLONE_NEWPID 0x20000000 /* New pid namespace */
30 #define CLONE_NEWNET 0x40000000 /* New network namespace */
31 #define CLONE_IO 0x80000000 /* Clone io context */
36 #define SCHED_NORMAL 0
40 /* SCHED_ISO: reserved but not implemented yet */
42 /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
43 #define SCHED_RESET_ON_FORK 0x40000000
51 #include <asm/param.h> /* for HZ */
53 #include <linux/capability.h>
54 #include <linux/threads.h>
55 #include <linux/kernel.h>
56 #include <linux/types.h>
57 #include <linux/timex.h>
58 #include <linux/jiffies.h>
59 #include <linux/rbtree.h>
60 #include <linux/thread_info.h>
61 #include <linux/cpumask.h>
62 #include <linux/errno.h>
63 #include <linux/nodemask.h>
64 #include <linux/mm_types.h>
67 #include <asm/ptrace.h>
68 #include <asm/cputime.h>
70 #include <linux/smp.h>
71 #include <linux/sem.h>
72 #include <linux/signal.h>
73 #include <linux/compiler.h>
74 #include <linux/completion.h>
75 #include <linux/pid.h>
76 #include <linux/percpu.h>
77 #include <linux/topology.h>
78 #include <linux/proportions.h>
79 #include <linux/seccomp.h>
80 #include <linux/rcupdate.h>
81 #include <linux/rculist.h>
82 #include <linux/rtmutex.h>
84 #include <linux/time.h>
85 #include <linux/param.h>
86 #include <linux/resource.h>
87 #include <linux/timer.h>
88 #include <linux/hrtimer.h>
89 #include <linux/task_io_accounting.h>
90 #include <linux/latencytop.h>
91 #include <linux/cred.h>
92 #include <linux/llist.h>
93 #include <linux/uidgid.h>
95 #include <asm/processor.h>
98 struct futex_pi_state;
99 struct robust_list_head;
102 struct perf_event_context;
106 * List of flags we want to share for kernel threads,
107 * if only because they are not used by them anyway.
109 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
112 * These are the constant used to fake the fixed-point load-average
113 * counting. Some notes:
114 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
115 * a load-average precision of 10 bits integer + 11 bits fractional
116 * - if you want to count load-averages more often, you need more
117 * precision, or rounding will get you. With 2-second counting freq,
118 * the EXP_n values would be 1981, 2034 and 2043 if still using only
121 extern unsigned long avenrun[]; /* Load averages */
122 extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
124 #define FSHIFT 11 /* nr of bits of precision */
125 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
126 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
127 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
128 #define EXP_5 2014 /* 1/exp(5sec/5min) */
129 #define EXP_15 2037 /* 1/exp(5sec/15min) */
131 #define CALC_LOAD(load,exp,n) \
133 load += n*(FIXED_1-exp); \
136 extern unsigned long total_forks;
137 extern int nr_threads;
138 DECLARE_PER_CPU(unsigned long, process_counts);
139 extern int nr_processes(void);
140 extern unsigned long nr_running(void);
141 extern unsigned long nr_uninterruptible(void);
142 extern unsigned long nr_iowait(void);
143 extern unsigned long nr_iowait_cpu(int cpu);
144 extern unsigned long this_cpu_load(void);
147 extern void calc_global_load(unsigned long ticks);
148 extern void update_cpu_load_nohz(void);
150 extern unsigned long get_parent_ip(unsigned long addr);
155 #ifdef CONFIG_SCHED_DEBUG
156 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
157 extern void proc_sched_set_task(struct task_struct *p);
159 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
162 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
165 static inline void proc_sched_set_task(struct task_struct *p)
169 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
175 * Task state bitmask. NOTE! These bits are also
176 * encoded in fs/proc/array.c: get_task_state().
178 * We have two separate sets of flags: task->state
179 * is about runnability, while task->exit_state are
180 * about the task exiting. Confusing, but this way
181 * modifying one set can't modify the other one by
184 #define TASK_RUNNING 0
185 #define TASK_INTERRUPTIBLE 1
186 #define TASK_UNINTERRUPTIBLE 2
187 #define __TASK_STOPPED 4
188 #define __TASK_TRACED 8
189 /* in tsk->exit_state */
190 #define EXIT_ZOMBIE 16
192 /* in tsk->state again */
194 #define TASK_WAKEKILL 128
195 #define TASK_WAKING 256
196 #define TASK_STATE_MAX 512
198 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
200 extern char ___assert_task_state[1 - 2*!!(
201 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
203 /* Convenience macros for the sake of set_task_state */
204 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
205 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
206 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
208 /* Convenience macros for the sake of wake_up */
209 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
210 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
212 /* get_task_state() */
213 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
214 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
217 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
218 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
219 #define task_is_dead(task) ((task)->exit_state != 0)
220 #define task_is_stopped_or_traced(task) \
221 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
222 #define task_contributes_to_load(task) \
223 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
224 (task->flags & PF_FROZEN) == 0)
226 #define __set_task_state(tsk, state_value) \
227 do { (tsk)->state = (state_value); } while (0)
228 #define set_task_state(tsk, state_value) \
229 set_mb((tsk)->state, (state_value))
232 * set_current_state() includes a barrier so that the write of current->state
233 * is correctly serialised wrt the caller's subsequent test of whether to
236 * set_current_state(TASK_UNINTERRUPTIBLE);
237 * if (do_i_need_to_sleep())
240 * If the caller does not need such serialisation then use __set_current_state()
242 #define __set_current_state(state_value) \
243 do { current->state = (state_value); } while (0)
244 #define set_current_state(state_value) \
245 set_mb(current->state, (state_value))
247 /* Task command name length */
248 #define TASK_COMM_LEN 16
250 #include <linux/spinlock.h>
253 * This serializes "schedule()" and also protects
254 * the run-queue from deletions/modifications (but
255 * _adding_ to the beginning of the run-queue has
258 extern rwlock_t tasklist_lock;
259 extern spinlock_t mmlist_lock;
263 #ifdef CONFIG_PROVE_RCU
264 extern int lockdep_tasklist_lock_is_held(void);
265 #endif /* #ifdef CONFIG_PROVE_RCU */
267 extern void sched_init(void);
268 extern void sched_init_smp(void);
269 extern asmlinkage void schedule_tail(struct task_struct *prev);
270 extern void init_idle(struct task_struct *idle, int cpu);
271 extern void init_idle_bootup_task(struct task_struct *idle);
273 extern int runqueue_is_locked(int cpu);
275 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
276 extern void select_nohz_load_balancer(int stop_tick);
277 extern void set_cpu_sd_state_idle(void);
278 extern int get_nohz_timer_target(void);
280 static inline void select_nohz_load_balancer(int stop_tick) { }
281 static inline void set_cpu_sd_state_idle(void) { }
285 * Only dump TASK_* tasks. (0 for all tasks)
287 extern void show_state_filter(unsigned long state_filter);
289 static inline void show_state(void)
291 show_state_filter(0);
294 extern void show_regs(struct pt_regs *);
297 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
298 * task), SP is the stack pointer of the first frame that should be shown in the back
299 * trace (or NULL if the entire call-chain of the task should be shown).
301 extern void show_stack(struct task_struct *task, unsigned long *sp);
303 void io_schedule(void);
304 long io_schedule_timeout(long timeout);
306 extern void cpu_init (void);
307 extern void trap_init(void);
308 extern void update_process_times(int user);
309 extern void scheduler_tick(void);
311 extern void sched_show_task(struct task_struct *p);
313 #ifdef CONFIG_LOCKUP_DETECTOR
314 extern void touch_softlockup_watchdog(void);
315 extern void touch_softlockup_watchdog_sync(void);
316 extern void touch_all_softlockup_watchdogs(void);
317 extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
319 size_t *lenp, loff_t *ppos);
320 extern unsigned int softlockup_panic;
321 void lockup_detector_init(void);
323 static inline void touch_softlockup_watchdog(void)
326 static inline void touch_softlockup_watchdog_sync(void)
329 static inline void touch_all_softlockup_watchdogs(void)
332 static inline void lockup_detector_init(void)
337 #ifdef CONFIG_DETECT_HUNG_TASK
338 extern unsigned int sysctl_hung_task_panic;
339 extern unsigned long sysctl_hung_task_check_count;
340 extern unsigned long sysctl_hung_task_timeout_secs;
341 extern unsigned long sysctl_hung_task_warnings;
342 extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
344 size_t *lenp, loff_t *ppos);
346 /* Avoid need for ifdefs elsewhere in the code */
347 enum { sysctl_hung_task_timeout_secs = 0 };
350 /* Attach to any functions which should be ignored in wchan output. */
351 #define __sched __attribute__((__section__(".sched.text")))
353 /* Linker adds these: start and end of __sched functions */
354 extern char __sched_text_start[], __sched_text_end[];
356 /* Is this address in the __sched functions? */
357 extern int in_sched_functions(unsigned long addr);
359 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
360 extern signed long schedule_timeout(signed long timeout);
361 extern signed long schedule_timeout_interruptible(signed long timeout);
362 extern signed long schedule_timeout_killable(signed long timeout);
363 extern signed long schedule_timeout_uninterruptible(signed long timeout);
364 asmlinkage void schedule(void);
365 extern void schedule_preempt_disabled(void);
366 extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);
369 struct user_namespace;
372 * Default maximum number of active map areas, this limits the number of vmas
373 * per mm struct. Users can overwrite this number by sysctl but there is a
376 * When a program's coredump is generated as ELF format, a section is created
377 * per a vma. In ELF, the number of sections is represented in unsigned short.
378 * This means the number of sections should be smaller than 65535 at coredump.
379 * Because the kernel adds some informative sections to a image of program at
380 * generating coredump, we need some margin. The number of extra sections is
381 * 1-3 now and depends on arch. We use "5" as safe margin, here.
383 #define MAPCOUNT_ELF_CORE_MARGIN (5)
384 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
386 extern int sysctl_max_map_count;
388 #include <linux/aio.h>
391 extern void arch_pick_mmap_layout(struct mm_struct *mm);
393 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
394 unsigned long, unsigned long);
396 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
397 unsigned long len, unsigned long pgoff,
398 unsigned long flags);
399 extern void arch_unmap_area(struct mm_struct *, unsigned long);
400 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
402 static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
406 extern void set_dumpable(struct mm_struct *mm, int value);
407 extern int get_dumpable(struct mm_struct *mm);
409 /* get/set_dumpable() values */
410 #define SUID_DUMPABLE_DISABLED 0
411 #define SUID_DUMPABLE_ENABLED 1
412 #define SUID_DUMPABLE_SAFE 2
416 #define MMF_DUMPABLE 0 /* core dump is permitted */
417 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
419 #define MMF_DUMPABLE_BITS 2
420 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
422 /* coredump filter bits */
423 #define MMF_DUMP_ANON_PRIVATE 2
424 #define MMF_DUMP_ANON_SHARED 3
425 #define MMF_DUMP_MAPPED_PRIVATE 4
426 #define MMF_DUMP_MAPPED_SHARED 5
427 #define MMF_DUMP_ELF_HEADERS 6
428 #define MMF_DUMP_HUGETLB_PRIVATE 7
429 #define MMF_DUMP_HUGETLB_SHARED 8
431 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
432 #define MMF_DUMP_FILTER_BITS 7
433 #define MMF_DUMP_FILTER_MASK \
434 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
435 #define MMF_DUMP_FILTER_DEFAULT \
436 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
437 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
439 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
440 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
442 # define MMF_DUMP_MASK_DEFAULT_ELF 0
444 /* leave room for more dump flags */
445 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
446 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
447 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
449 #define MMF_HAS_UPROBES 19 /* has uprobes */
450 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
452 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
454 struct sighand_struct {
456 struct k_sigaction action[_NSIG];
458 wait_queue_head_t signalfd_wqh;
461 struct pacct_struct {
464 unsigned long ac_mem;
465 cputime_t ac_utime, ac_stime;
466 unsigned long ac_minflt, ac_majflt;
477 * struct task_cputime - collected CPU time counts
478 * @utime: time spent in user mode, in &cputime_t units
479 * @stime: time spent in kernel mode, in &cputime_t units
480 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
482 * This structure groups together three kinds of CPU time that are
483 * tracked for threads and thread groups. Most things considering
484 * CPU time want to group these counts together and treat all three
485 * of them in parallel.
487 struct task_cputime {
490 unsigned long long sum_exec_runtime;
492 /* Alternate field names when used to cache expirations. */
493 #define prof_exp stime
494 #define virt_exp utime
495 #define sched_exp sum_exec_runtime
497 #define INIT_CPUTIME \
498 (struct task_cputime) { \
501 .sum_exec_runtime = 0, \
505 * Disable preemption until the scheduler is running.
506 * Reset by start_kernel()->sched_init()->init_idle().
508 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
509 * before the scheduler is active -- see should_resched().
511 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
514 * struct thread_group_cputimer - thread group interval timer counts
515 * @cputime: thread group interval timers.
516 * @running: non-zero when there are timers running and
517 * @cputime receives updates.
518 * @lock: lock for fields in this struct.
520 * This structure contains the version of task_cputime, above, that is
521 * used for thread group CPU timer calculations.
523 struct thread_group_cputimer {
524 struct task_cputime cputime;
529 #include <linux/rwsem.h>
533 * NOTE! "signal_struct" does not have its own
534 * locking, because a shared signal_struct always
535 * implies a shared sighand_struct, so locking
536 * sighand_struct is always a proper superset of
537 * the locking of signal_struct.
539 struct signal_struct {
544 wait_queue_head_t wait_chldexit; /* for wait4() */
546 /* current thread group signal load-balancing target: */
547 struct task_struct *curr_target;
549 /* shared signal handling: */
550 struct sigpending shared_pending;
552 /* thread group exit support */
555 * - notify group_exit_task when ->count is equal to notify_count
556 * - everyone except group_exit_task is stopped during signal delivery
557 * of fatal signals, group_exit_task processes the signal.
560 struct task_struct *group_exit_task;
562 /* thread group stop support, overloads group_exit_code too */
563 int group_stop_count;
564 unsigned int flags; /* see SIGNAL_* flags below */
567 * PR_SET_CHILD_SUBREAPER marks a process, like a service
568 * manager, to re-parent orphan (double-forking) child processes
569 * to this process instead of 'init'. The service manager is
570 * able to receive SIGCHLD signals and is able to investigate
571 * the process until it calls wait(). All children of this
572 * process will inherit a flag if they should look for a
573 * child_subreaper process at exit.
575 unsigned int is_child_subreaper:1;
576 unsigned int has_child_subreaper:1;
578 /* POSIX.1b Interval Timers */
579 struct list_head posix_timers;
581 /* ITIMER_REAL timer for the process */
582 struct hrtimer real_timer;
583 struct pid *leader_pid;
584 ktime_t it_real_incr;
587 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
588 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
589 * values are defined to 0 and 1 respectively
591 struct cpu_itimer it[2];
594 * Thread group totals for process CPU timers.
595 * See thread_group_cputimer(), et al, for details.
597 struct thread_group_cputimer cputimer;
599 /* Earliest-expiration cache. */
600 struct task_cputime cputime_expires;
602 struct list_head cpu_timers[3];
604 struct pid *tty_old_pgrp;
606 /* boolean value for session group leader */
609 struct tty_struct *tty; /* NULL if no tty */
611 #ifdef CONFIG_SCHED_AUTOGROUP
612 struct autogroup *autogroup;
615 * Cumulative resource counters for dead threads in the group,
616 * and for reaped dead child processes forked by this group.
617 * Live threads maintain their own counters and add to these
618 * in __exit_signal, except for the group leader.
620 cputime_t utime, stime, cutime, cstime;
623 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
624 cputime_t prev_utime, prev_stime;
626 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
627 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
628 unsigned long inblock, oublock, cinblock, coublock;
629 unsigned long maxrss, cmaxrss;
630 struct task_io_accounting ioac;
633 * Cumulative ns of schedule CPU time fo dead threads in the
634 * group, not including a zombie group leader, (This only differs
635 * from jiffies_to_ns(utime + stime) if sched_clock uses something
636 * other than jiffies.)
638 unsigned long long sum_sched_runtime;
641 * We don't bother to synchronize most readers of this at all,
642 * because there is no reader checking a limit that actually needs
643 * to get both rlim_cur and rlim_max atomically, and either one
644 * alone is a single word that can safely be read normally.
645 * getrlimit/setrlimit use task_lock(current->group_leader) to
646 * protect this instead of the siglock, because they really
647 * have no need to disable irqs.
649 struct rlimit rlim[RLIM_NLIMITS];
651 #ifdef CONFIG_BSD_PROCESS_ACCT
652 struct pacct_struct pacct; /* per-process accounting information */
654 #ifdef CONFIG_TASKSTATS
655 struct taskstats *stats;
659 struct tty_audit_buf *tty_audit_buf;
661 #ifdef CONFIG_CGROUPS
663 * group_rwsem prevents new tasks from entering the threadgroup and
664 * member tasks from exiting,a more specifically, setting of
665 * PF_EXITING. fork and exit paths are protected with this rwsem
666 * using threadgroup_change_begin/end(). Users which require
667 * threadgroup to remain stable should use threadgroup_[un]lock()
668 * which also takes care of exec path. Currently, cgroup is the
671 struct rw_semaphore group_rwsem;
674 int oom_adj; /* OOM kill score adjustment (bit shift) */
675 int oom_score_adj; /* OOM kill score adjustment */
676 int oom_score_adj_min; /* OOM kill score adjustment minimum value.
677 * Only settable by CAP_SYS_RESOURCE. */
679 struct mutex cred_guard_mutex; /* guard against foreign influences on
680 * credential calculations
681 * (notably. ptrace) */
684 /* Context switch must be unlocked if interrupts are to be enabled */
685 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
686 # define __ARCH_WANT_UNLOCKED_CTXSW
690 * Bits in flags field of signal_struct.
692 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
693 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
694 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
696 * Pending notifications to parent.
698 #define SIGNAL_CLD_STOPPED 0x00000010
699 #define SIGNAL_CLD_CONTINUED 0x00000020
700 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
702 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
704 /* If true, all threads except ->group_exit_task have pending SIGKILL */
705 static inline int signal_group_exit(const struct signal_struct *sig)
707 return (sig->flags & SIGNAL_GROUP_EXIT) ||
708 (sig->group_exit_task != NULL);
712 * Some day this will be a full-fledged user tracking system..
715 atomic_t __count; /* reference count */
716 atomic_t processes; /* How many processes does this user have? */
717 atomic_t files; /* How many open files does this user have? */
718 atomic_t sigpending; /* How many pending signals does this user have? */
719 #ifdef CONFIG_INOTIFY_USER
720 atomic_t inotify_watches; /* How many inotify watches does this user have? */
721 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
723 #ifdef CONFIG_FANOTIFY
724 atomic_t fanotify_listeners;
727 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
729 #ifdef CONFIG_POSIX_MQUEUE
730 /* protected by mq_lock */
731 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
733 unsigned long locked_shm; /* How many pages of mlocked shm ? */
736 struct key *uid_keyring; /* UID specific keyring */
737 struct key *session_keyring; /* UID's default session keyring */
740 /* Hash table maintenance information */
741 struct hlist_node uidhash_node;
744 #ifdef CONFIG_PERF_EVENTS
745 atomic_long_t locked_vm;
749 extern int uids_sysfs_init(void);
751 extern struct user_struct *find_user(kuid_t);
753 extern struct user_struct root_user;
754 #define INIT_USER (&root_user)
757 struct backing_dev_info;
758 struct reclaim_state;
760 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
762 /* cumulative counters */
763 unsigned long pcount; /* # of times run on this cpu */
764 unsigned long long run_delay; /* time spent waiting on a runqueue */
767 unsigned long long last_arrival,/* when we last ran on a cpu */
768 last_queued; /* when we were last queued to run */
770 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
772 #ifdef CONFIG_TASK_DELAY_ACCT
773 struct task_delay_info {
775 unsigned int flags; /* Private per-task flags */
777 /* For each stat XXX, add following, aligned appropriately
779 * struct timespec XXX_start, XXX_end;
783 * Atomicity of updates to XXX_delay, XXX_count protected by
784 * single lock above (split into XXX_lock if contention is an issue).
788 * XXX_count is incremented on every XXX operation, the delay
789 * associated with the operation is added to XXX_delay.
790 * XXX_delay contains the accumulated delay time in nanoseconds.
792 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
793 u64 blkio_delay; /* wait for sync block io completion */
794 u64 swapin_delay; /* wait for swapin block io completion */
795 u32 blkio_count; /* total count of the number of sync block */
796 /* io operations performed */
797 u32 swapin_count; /* total count of the number of swapin block */
798 /* io operations performed */
800 struct timespec freepages_start, freepages_end;
801 u64 freepages_delay; /* wait for memory reclaim */
802 u32 freepages_count; /* total count of memory reclaim */
804 #endif /* CONFIG_TASK_DELAY_ACCT */
806 static inline int sched_info_on(void)
808 #ifdef CONFIG_SCHEDSTATS
810 #elif defined(CONFIG_TASK_DELAY_ACCT)
811 extern int delayacct_on;
826 * Increase resolution of nice-level calculations for 64-bit architectures.
827 * The extra resolution improves shares distribution and load balancing of
828 * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
829 * hierarchies, especially on larger systems. This is not a user-visible change
830 * and does not change the user-interface for setting shares/weights.
832 * We increase resolution only if we have enough bits to allow this increased
833 * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
834 * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
837 #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */
838 # define SCHED_LOAD_RESOLUTION 10
839 # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION)
840 # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION)
842 # define SCHED_LOAD_RESOLUTION 0
843 # define scale_load(w) (w)
844 # define scale_load_down(w) (w)
847 #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION)
848 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
851 * Increase resolution of cpu_power calculations
853 #define SCHED_POWER_SHIFT 10
854 #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
857 * sched-domains (multiprocessor balancing) declarations:
860 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
861 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
862 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
863 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
864 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
865 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
866 #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */
867 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
868 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
869 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
870 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
871 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
872 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
874 extern int __weak arch_sd_sibiling_asym_packing(void);
876 struct sched_group_power {
879 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
882 unsigned int power, power_orig;
883 unsigned long next_update;
885 * Number of busy cpus in this group.
887 atomic_t nr_busy_cpus;
889 unsigned long cpumask[0]; /* iteration mask */
893 struct sched_group *next; /* Must be a circular list */
896 unsigned int group_weight;
897 struct sched_group_power *sgp;
900 * The CPUs this group covers.
902 * NOTE: this field is variable length. (Allocated dynamically
903 * by attaching extra space to the end of the structure,
904 * depending on how many CPUs the kernel has booted up with)
906 unsigned long cpumask[0];
909 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
911 return to_cpumask(sg->cpumask);
915 * cpumask masking which cpus in the group are allowed to iterate up the domain
918 static inline struct cpumask *sched_group_mask(struct sched_group *sg)
920 return to_cpumask(sg->sgp->cpumask);
924 * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
925 * @group: The group whose first cpu is to be returned.
927 static inline unsigned int group_first_cpu(struct sched_group *group)
929 return cpumask_first(sched_group_cpus(group));
932 struct sched_domain_attr {
933 int relax_domain_level;
936 #define SD_ATTR_INIT (struct sched_domain_attr) { \
937 .relax_domain_level = -1, \
940 extern int sched_domain_level_max;
942 struct sched_domain {
943 /* These fields must be setup */
944 struct sched_domain *parent; /* top domain must be null terminated */
945 struct sched_domain *child; /* bottom domain must be null terminated */
946 struct sched_group *groups; /* the balancing groups of the domain */
947 unsigned long min_interval; /* Minimum balance interval ms */
948 unsigned long max_interval; /* Maximum balance interval ms */
949 unsigned int busy_factor; /* less balancing by factor if busy */
950 unsigned int imbalance_pct; /* No balance until over watermark */
951 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
952 unsigned int busy_idx;
953 unsigned int idle_idx;
954 unsigned int newidle_idx;
955 unsigned int wake_idx;
956 unsigned int forkexec_idx;
957 unsigned int smt_gain;
958 int flags; /* See SD_* */
961 /* Runtime fields. */
962 unsigned long last_balance; /* init to jiffies. units in jiffies */
963 unsigned int balance_interval; /* initialise to 1. units in ms. */
964 unsigned int nr_balance_failed; /* initialise to 0 */
968 #ifdef CONFIG_SCHEDSTATS
969 /* load_balance() stats */
970 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
971 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
972 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
973 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
974 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
975 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
976 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
977 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
979 /* Active load balancing */
980 unsigned int alb_count;
981 unsigned int alb_failed;
982 unsigned int alb_pushed;
984 /* SD_BALANCE_EXEC stats */
985 unsigned int sbe_count;
986 unsigned int sbe_balanced;
987 unsigned int sbe_pushed;
989 /* SD_BALANCE_FORK stats */
990 unsigned int sbf_count;
991 unsigned int sbf_balanced;
992 unsigned int sbf_pushed;
994 /* try_to_wake_up() stats */
995 unsigned int ttwu_wake_remote;
996 unsigned int ttwu_move_affine;
997 unsigned int ttwu_move_balance;
999 #ifdef CONFIG_SCHED_DEBUG
1003 void *private; /* used during construction */
1004 struct rcu_head rcu; /* used during destruction */
1007 unsigned int span_weight;
1009 * Span of all CPUs in this domain.
1011 * NOTE: this field is variable length. (Allocated dynamically
1012 * by attaching extra space to the end of the structure,
1013 * depending on how many CPUs the kernel has booted up with)
1015 unsigned long span[0];
1018 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
1020 return to_cpumask(sd->span);
1023 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1024 struct sched_domain_attr *dattr_new);
1026 /* Allocate an array of sched domains, for partition_sched_domains(). */
1027 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
1028 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
1030 /* Test a flag in parent sched domain */
1031 static inline int test_sd_parent(struct sched_domain *sd, int flag)
1033 if (sd->parent && (sd->parent->flags & flag))
1039 unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
1040 unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
1042 bool cpus_share_cache(int this_cpu, int that_cpu);
1044 #else /* CONFIG_SMP */
1046 struct sched_domain_attr;
1049 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1050 struct sched_domain_attr *dattr_new)
1054 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
1059 #endif /* !CONFIG_SMP */
1062 struct io_context; /* See blkdev.h */
1065 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1066 extern void prefetch_stack(struct task_struct *t);
1068 static inline void prefetch_stack(struct task_struct *t) { }
1071 struct audit_context; /* See audit.c */
1073 struct pipe_inode_info;
1074 struct uts_namespace;
1077 struct sched_domain;
1082 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
1083 #define WF_FORK 0x02 /* child wakeup after fork */
1084 #define WF_MIGRATED 0x04 /* internal use, task got migrated */
1086 #define ENQUEUE_WAKEUP 1
1087 #define ENQUEUE_HEAD 2
1089 #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */
1091 #define ENQUEUE_WAKING 0
1094 #define DEQUEUE_SLEEP 1
1096 struct sched_class {
1097 const struct sched_class *next;
1099 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
1100 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
1101 void (*yield_task) (struct rq *rq);
1102 bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt);
1104 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
1106 struct task_struct * (*pick_next_task) (struct rq *rq);
1107 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
1110 int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);
1112 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1113 void (*post_schedule) (struct rq *this_rq);
1114 void (*task_waking) (struct task_struct *task);
1115 void (*task_woken) (struct rq *this_rq, struct task_struct *task);
1117 void (*set_cpus_allowed)(struct task_struct *p,
1118 const struct cpumask *newmask);
1120 void (*rq_online)(struct rq *rq);
1121 void (*rq_offline)(struct rq *rq);
1124 void (*set_curr_task) (struct rq *rq);
1125 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1126 void (*task_fork) (struct task_struct *p);
1128 void (*switched_from) (struct rq *this_rq, struct task_struct *task);
1129 void (*switched_to) (struct rq *this_rq, struct task_struct *task);
1130 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1133 unsigned int (*get_rr_interval) (struct rq *rq,
1134 struct task_struct *task);
1136 #ifdef CONFIG_FAIR_GROUP_SCHED
1137 void (*task_move_group) (struct task_struct *p, int on_rq);
1141 struct load_weight {
1142 unsigned long weight, inv_weight;
1145 #ifdef CONFIG_SCHEDSTATS
1146 struct sched_statistics {
1156 s64 sum_sleep_runtime;
1163 u64 nr_migrations_cold;
1164 u64 nr_failed_migrations_affine;
1165 u64 nr_failed_migrations_running;
1166 u64 nr_failed_migrations_hot;
1167 u64 nr_forced_migrations;
1170 u64 nr_wakeups_sync;
1171 u64 nr_wakeups_migrate;
1172 u64 nr_wakeups_local;
1173 u64 nr_wakeups_remote;
1174 u64 nr_wakeups_affine;
1175 u64 nr_wakeups_affine_attempts;
1176 u64 nr_wakeups_passive;
1177 u64 nr_wakeups_idle;
1181 struct sched_entity {
1182 struct load_weight load; /* for load-balancing */
1183 struct rb_node run_node;
1184 struct list_head group_node;
1188 u64 sum_exec_runtime;
1190 u64 prev_sum_exec_runtime;
1194 #ifdef CONFIG_SCHEDSTATS
1195 struct sched_statistics statistics;
1198 #ifdef CONFIG_FAIR_GROUP_SCHED
1199 struct sched_entity *parent;
1200 /* rq on which this entity is (to be) queued: */
1201 struct cfs_rq *cfs_rq;
1202 /* rq "owned" by this entity/group: */
1203 struct cfs_rq *my_q;
1207 struct sched_rt_entity {
1208 struct list_head run_list;
1209 unsigned long timeout;
1210 unsigned int time_slice;
1212 struct sched_rt_entity *back;
1213 #ifdef CONFIG_RT_GROUP_SCHED
1214 struct sched_rt_entity *parent;
1215 /* rq on which this entity is (to be) queued: */
1216 struct rt_rq *rt_rq;
1217 /* rq "owned" by this entity/group: */
1223 * default timeslice is 100 msecs (used only for SCHED_RR tasks).
1224 * Timeslices get refilled after they expire.
1226 #define RR_TIMESLICE (100 * HZ / 1000)
1230 enum perf_event_task_context {
1231 perf_invalid_context = -1,
1232 perf_hw_context = 0,
1234 perf_nr_task_contexts,
1237 struct task_struct {
1238 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1241 unsigned int flags; /* per process flags, defined below */
1242 unsigned int ptrace;
1245 struct llist_node wake_entry;
1250 int prio, static_prio, normal_prio;
1251 unsigned int rt_priority;
1252 const struct sched_class *sched_class;
1253 struct sched_entity se;
1254 struct sched_rt_entity rt;
1255 #ifdef CONFIG_CGROUP_SCHED
1256 struct task_group *sched_task_group;
1259 #ifdef CONFIG_PREEMPT_NOTIFIERS
1260 /* list of struct preempt_notifier: */
1261 struct hlist_head preempt_notifiers;
1265 * fpu_counter contains the number of consecutive context switches
1266 * that the FPU is used. If this is over a threshold, the lazy fpu
1267 * saving becomes unlazy to save the trap. This is an unsigned char
1268 * so that after 256 times the counter wraps and the behavior turns
1269 * lazy again; this to deal with bursty apps that only use FPU for
1272 unsigned char fpu_counter;
1273 #ifdef CONFIG_BLK_DEV_IO_TRACE
1274 unsigned int btrace_seq;
1277 unsigned int policy;
1278 int nr_cpus_allowed;
1279 cpumask_t cpus_allowed;
1281 #ifdef CONFIG_PREEMPT_RCU
1282 int rcu_read_lock_nesting;
1283 char rcu_read_unlock_special;
1284 struct list_head rcu_node_entry;
1285 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1286 #ifdef CONFIG_TREE_PREEMPT_RCU
1287 struct rcu_node *rcu_blocked_node;
1288 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1289 #ifdef CONFIG_RCU_BOOST
1290 struct rt_mutex *rcu_boost_mutex;
1291 #endif /* #ifdef CONFIG_RCU_BOOST */
1293 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1294 struct sched_info sched_info;
1297 struct list_head tasks;
1299 struct plist_node pushable_tasks;
1302 struct mm_struct *mm, *active_mm;
1303 #ifdef CONFIG_COMPAT_BRK
1304 unsigned brk_randomized:1;
1306 #if defined(SPLIT_RSS_COUNTING)
1307 struct task_rss_stat rss_stat;
1311 int exit_code, exit_signal;
1312 int pdeath_signal; /* The signal sent when the parent dies */
1313 unsigned int jobctl; /* JOBCTL_*, siglock protected */
1315 unsigned int personality;
1316 unsigned did_exec:1;
1317 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1319 unsigned in_iowait:1;
1321 /* task may not gain privileges */
1322 unsigned no_new_privs:1;
1324 /* Revert to default priority/policy when forking */
1325 unsigned sched_reset_on_fork:1;
1326 unsigned sched_contributes_to_load:1;
1331 #ifdef CONFIG_CC_STACKPROTECTOR
1332 /* Canary value for the -fstack-protector gcc feature */
1333 unsigned long stack_canary;
1336 * pointers to (original) parent process, youngest child, younger sibling,
1337 * older sibling, respectively. (p->father can be replaced with
1338 * p->real_parent->pid)
1340 struct task_struct __rcu *real_parent; /* real parent process */
1341 struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
1343 * children/sibling forms the list of my natural children
1345 struct list_head children; /* list of my children */
1346 struct list_head sibling; /* linkage in my parent's children list */
1347 struct task_struct *group_leader; /* threadgroup leader */
1350 * ptraced is the list of tasks this task is using ptrace on.
1351 * This includes both natural children and PTRACE_ATTACH targets.
1352 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1354 struct list_head ptraced;
1355 struct list_head ptrace_entry;
1357 /* PID/PID hash table linkage. */
1358 struct pid_link pids[PIDTYPE_MAX];
1359 struct list_head thread_group;
1361 struct completion *vfork_done; /* for vfork() */
1362 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1363 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1365 cputime_t utime, stime, utimescaled, stimescaled;
1367 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
1368 cputime_t prev_utime, prev_stime;
1370 unsigned long nvcsw, nivcsw; /* context switch counts */
1371 struct timespec start_time; /* monotonic time */
1372 struct timespec real_start_time; /* boot based time */
1373 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1374 unsigned long min_flt, maj_flt;
1376 struct task_cputime cputime_expires;
1377 struct list_head cpu_timers[3];
1379 /* process credentials */
1380 const struct cred __rcu *real_cred; /* objective and real subjective task
1381 * credentials (COW) */
1382 const struct cred __rcu *cred; /* effective (overridable) subjective task
1383 * credentials (COW) */
1384 char comm[TASK_COMM_LEN]; /* executable name excluding path
1385 - access with [gs]et_task_comm (which lock
1386 it with task_lock())
1387 - initialized normally by setup_new_exec */
1388 /* file system info */
1389 int link_count, total_link_count;
1390 #ifdef CONFIG_SYSVIPC
1392 struct sysv_sem sysvsem;
1394 #ifdef CONFIG_DETECT_HUNG_TASK
1395 /* hung task detection */
1396 unsigned long last_switch_count;
1398 /* CPU-specific state of this task */
1399 struct thread_struct thread;
1400 /* filesystem information */
1401 struct fs_struct *fs;
1402 /* open file information */
1403 struct files_struct *files;
1405 struct nsproxy *nsproxy;
1406 /* signal handlers */
1407 struct signal_struct *signal;
1408 struct sighand_struct *sighand;
1410 sigset_t blocked, real_blocked;
1411 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1412 struct sigpending pending;
1414 unsigned long sas_ss_sp;
1416 int (*notifier)(void *priv);
1417 void *notifier_data;
1418 sigset_t *notifier_mask;
1419 struct callback_head *task_works;
1421 struct audit_context *audit_context;
1422 #ifdef CONFIG_AUDITSYSCALL
1424 unsigned int sessionid;
1426 struct seccomp seccomp;
1428 /* Thread group tracking */
1431 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1433 spinlock_t alloc_lock;
1435 /* Protection of the PI data structures: */
1436 raw_spinlock_t pi_lock;
1438 #ifdef CONFIG_RT_MUTEXES
1439 /* PI waiters blocked on a rt_mutex held by this task */
1440 struct plist_head pi_waiters;
1441 /* Deadlock detection and priority inheritance handling */
1442 struct rt_mutex_waiter *pi_blocked_on;
1445 #ifdef CONFIG_DEBUG_MUTEXES
1446 /* mutex deadlock detection */
1447 struct mutex_waiter *blocked_on;
1449 #ifdef CONFIG_TRACE_IRQFLAGS
1450 unsigned int irq_events;
1451 unsigned long hardirq_enable_ip;
1452 unsigned long hardirq_disable_ip;
1453 unsigned int hardirq_enable_event;
1454 unsigned int hardirq_disable_event;
1455 int hardirqs_enabled;
1456 int hardirq_context;
1457 unsigned long softirq_disable_ip;
1458 unsigned long softirq_enable_ip;
1459 unsigned int softirq_disable_event;
1460 unsigned int softirq_enable_event;
1461 int softirqs_enabled;
1462 int softirq_context;
1464 #ifdef CONFIG_LOCKDEP
1465 # define MAX_LOCK_DEPTH 48UL
1468 unsigned int lockdep_recursion;
1469 struct held_lock held_locks[MAX_LOCK_DEPTH];
1470 gfp_t lockdep_reclaim_gfp;
1473 /* journalling filesystem info */
1476 /* stacked block device info */
1477 struct bio_list *bio_list;
1480 /* stack plugging */
1481 struct blk_plug *plug;
1485 struct reclaim_state *reclaim_state;
1487 struct backing_dev_info *backing_dev_info;
1489 struct io_context *io_context;
1491 unsigned long ptrace_message;
1492 siginfo_t *last_siginfo; /* For ptrace use. */
1493 struct task_io_accounting ioac;
1494 #if defined(CONFIG_TASK_XACCT)
1495 u64 acct_rss_mem1; /* accumulated rss usage */
1496 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1497 cputime_t acct_timexpd; /* stime + utime since last update */
1499 #ifdef CONFIG_CPUSETS
1500 nodemask_t mems_allowed; /* Protected by alloc_lock */
1501 seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
1502 int cpuset_mem_spread_rotor;
1503 int cpuset_slab_spread_rotor;
1505 #ifdef CONFIG_CGROUPS
1506 /* Control Group info protected by css_set_lock */
1507 struct css_set __rcu *cgroups;
1508 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1509 struct list_head cg_list;
1512 struct robust_list_head __user *robust_list;
1513 #ifdef CONFIG_COMPAT
1514 struct compat_robust_list_head __user *compat_robust_list;
1516 struct list_head pi_state_list;
1517 struct futex_pi_state *pi_state_cache;
1519 #ifdef CONFIG_PERF_EVENTS
1520 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1521 struct mutex perf_event_mutex;
1522 struct list_head perf_event_list;
1525 struct mempolicy *mempolicy; /* Protected by alloc_lock */
1527 short pref_node_fork;
1529 struct rcu_head rcu;
1532 * cache last used pipe for splice
1534 struct pipe_inode_info *splice_pipe;
1535 #ifdef CONFIG_TASK_DELAY_ACCT
1536 struct task_delay_info *delays;
1538 #ifdef CONFIG_FAULT_INJECTION
1542 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1543 * balance_dirty_pages() for some dirty throttling pause
1546 int nr_dirtied_pause;
1547 unsigned long dirty_paused_when; /* start of a write-and-pause period */
1549 #ifdef CONFIG_LATENCYTOP
1550 int latency_record_count;
1551 struct latency_record latency_record[LT_SAVECOUNT];
1554 * time slack values; these are used to round up poll() and
1555 * select() etc timeout values. These are in nanoseconds.
1557 unsigned long timer_slack_ns;
1558 unsigned long default_timer_slack_ns;
1560 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1561 /* Index of current stored address in ret_stack */
1563 /* Stack of return addresses for return function tracing */
1564 struct ftrace_ret_stack *ret_stack;
1565 /* time stamp for last schedule */
1566 unsigned long long ftrace_timestamp;
1568 * Number of functions that haven't been traced
1569 * because of depth overrun.
1571 atomic_t trace_overrun;
1572 /* Pause for the tracing */
1573 atomic_t tracing_graph_pause;
1575 #ifdef CONFIG_TRACING
1576 /* state flags for use by tracers */
1577 unsigned long trace;
1578 /* bitmask and counter of trace recursion */
1579 unsigned long trace_recursion;
1580 #endif /* CONFIG_TRACING */
1581 #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
1582 struct memcg_batch_info {
1583 int do_batch; /* incremented when batch uncharge started */
1584 struct mem_cgroup *memcg; /* target memcg of uncharge */
1585 unsigned long nr_pages; /* uncharged usage */
1586 unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
1589 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1590 atomic_t ptrace_bp_refcnt;
1592 #ifdef CONFIG_UPROBES
1593 struct uprobe_task *utask;
1597 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1598 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1601 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1602 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1603 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1604 * values are inverted: lower p->prio value means higher priority.
1606 * The MAX_USER_RT_PRIO value allows the actual maximum
1607 * RT priority to be separate from the value exported to
1608 * user-space. This allows kernel threads to set their
1609 * priority to a value higher than any user task. Note:
1610 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1613 #define MAX_USER_RT_PRIO 100
1614 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1616 #define MAX_PRIO (MAX_RT_PRIO + 40)
1617 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1619 static inline int rt_prio(int prio)
1621 if (unlikely(prio < MAX_RT_PRIO))
1626 static inline int rt_task(struct task_struct *p)
1628 return rt_prio(p->prio);
1631 static inline struct pid *task_pid(struct task_struct *task)
1633 return task->pids[PIDTYPE_PID].pid;
1636 static inline struct pid *task_tgid(struct task_struct *task)
1638 return task->group_leader->pids[PIDTYPE_PID].pid;
1642 * Without tasklist or rcu lock it is not safe to dereference
1643 * the result of task_pgrp/task_session even if task == current,
1644 * we can race with another thread doing sys_setsid/sys_setpgid.
1646 static inline struct pid *task_pgrp(struct task_struct *task)
1648 return task->group_leader->pids[PIDTYPE_PGID].pid;
1651 static inline struct pid *task_session(struct task_struct *task)
1653 return task->group_leader->pids[PIDTYPE_SID].pid;
1656 struct pid_namespace;
1659 * the helpers to get the task's different pids as they are seen
1660 * from various namespaces
1662 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1663 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1665 * task_xid_nr_ns() : id seen from the ns specified;
1667 * set_task_vxid() : assigns a virtual id to a task;
1669 * see also pid_nr() etc in include/linux/pid.h
1671 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1672 struct pid_namespace *ns);
1674 static inline pid_t task_pid_nr(struct task_struct *tsk)
1679 static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1680 struct pid_namespace *ns)
1682 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1685 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1687 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1691 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1696 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1698 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1700 return pid_vnr(task_tgid(tsk));
1704 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1705 struct pid_namespace *ns)
1707 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1710 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1712 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1716 static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1717 struct pid_namespace *ns)
1719 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1722 static inline pid_t task_session_vnr(struct task_struct *tsk)
1724 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1727 /* obsolete, do not use */
1728 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1730 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1734 * pid_alive - check that a task structure is not stale
1735 * @p: Task structure to be checked.
1737 * Test if a process is not yet dead (at most zombie state)
1738 * If pid_alive fails, then pointers within the task structure
1739 * can be stale and must not be dereferenced.
1741 static inline int pid_alive(struct task_struct *p)
1743 return p->pids[PIDTYPE_PID].pid != NULL;
1747 * is_global_init - check if a task structure is init
1748 * @tsk: Task structure to be checked.
1750 * Check if a task structure is the first user space task the kernel created.
1752 static inline int is_global_init(struct task_struct *tsk)
1754 return tsk->pid == 1;
1758 * is_container_init:
1759 * check whether in the task is init in its own pid namespace.
1761 extern int is_container_init(struct task_struct *tsk);
1763 extern struct pid *cad_pid;
1765 extern void free_task(struct task_struct *tsk);
1766 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1768 extern void __put_task_struct(struct task_struct *t);
1770 static inline void put_task_struct(struct task_struct *t)
1772 if (atomic_dec_and_test(&t->usage))
1773 __put_task_struct(t);
1776 extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1777 extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1782 #define PF_EXITING 0x00000004 /* getting shut down */
1783 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1784 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1785 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1786 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1787 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1788 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1789 #define PF_DUMPCORE 0x00000200 /* dumped core */
1790 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1791 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1792 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1793 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1794 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1795 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1796 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1797 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1798 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1799 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1800 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1801 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1802 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1803 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1804 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1805 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1806 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1807 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1808 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1811 * Only the _current_ task can read/write to tsk->flags, but other
1812 * tasks can access tsk->flags in readonly mode for example
1813 * with tsk_used_math (like during threaded core dumping).
1814 * There is however an exception to this rule during ptrace
1815 * or during fork: the ptracer task is allowed to write to the
1816 * child->flags of its traced child (same goes for fork, the parent
1817 * can write to the child->flags), because we're guaranteed the
1818 * child is not running and in turn not changing child->flags
1819 * at the same time the parent does it.
1821 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1822 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1823 #define clear_used_math() clear_stopped_child_used_math(current)
1824 #define set_used_math() set_stopped_child_used_math(current)
1825 #define conditional_stopped_child_used_math(condition, child) \
1826 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1827 #define conditional_used_math(condition) \
1828 conditional_stopped_child_used_math(condition, current)
1829 #define copy_to_stopped_child_used_math(child) \
1830 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1831 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1832 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1833 #define used_math() tsk_used_math(current)
1836 * task->jobctl flags
1838 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1840 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1841 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1842 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1843 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1844 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1845 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1846 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1848 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1849 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
1850 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
1851 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
1852 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
1853 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
1854 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
1856 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1857 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
1859 extern bool task_set_jobctl_pending(struct task_struct *task,
1861 extern void task_clear_jobctl_trapping(struct task_struct *task);
1862 extern void task_clear_jobctl_pending(struct task_struct *task,
1865 #ifdef CONFIG_PREEMPT_RCU
1867 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1868 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1870 static inline void rcu_copy_process(struct task_struct *p)
1872 p->rcu_read_lock_nesting = 0;
1873 p->rcu_read_unlock_special = 0;
1874 #ifdef CONFIG_TREE_PREEMPT_RCU
1875 p->rcu_blocked_node = NULL;
1876 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1877 #ifdef CONFIG_RCU_BOOST
1878 p->rcu_boost_mutex = NULL;
1879 #endif /* #ifdef CONFIG_RCU_BOOST */
1880 INIT_LIST_HEAD(&p->rcu_node_entry);
1885 static inline void rcu_copy_process(struct task_struct *p)
1891 static inline void rcu_switch(struct task_struct *prev,
1892 struct task_struct *next)
1894 #ifdef CONFIG_RCU_USER_QS
1895 rcu_user_hooks_switch(prev, next);
1899 static inline void tsk_restore_flags(struct task_struct *task,
1900 unsigned long orig_flags, unsigned long flags)
1902 task->flags &= ~flags;
1903 task->flags |= orig_flags & flags;
1907 extern void do_set_cpus_allowed(struct task_struct *p,
1908 const struct cpumask *new_mask);
1910 extern int set_cpus_allowed_ptr(struct task_struct *p,
1911 const struct cpumask *new_mask);
1913 static inline void do_set_cpus_allowed(struct task_struct *p,
1914 const struct cpumask *new_mask)
1917 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1918 const struct cpumask *new_mask)
1920 if (!cpumask_test_cpu(0, new_mask))
1927 void calc_load_enter_idle(void);
1928 void calc_load_exit_idle(void);
1930 static inline void calc_load_enter_idle(void) { }
1931 static inline void calc_load_exit_idle(void) { }
1932 #endif /* CONFIG_NO_HZ */
1934 #ifndef CONFIG_CPUMASK_OFFSTACK
1935 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1937 return set_cpus_allowed_ptr(p, &new_mask);
1942 * Do not use outside of architecture code which knows its limitations.
1944 * sched_clock() has no promise of monotonicity or bounded drift between
1945 * CPUs, use (which you should not) requires disabling IRQs.
1947 * Please use one of the three interfaces below.
1949 extern unsigned long long notrace sched_clock(void);
1951 * See the comment in kernel/sched/clock.c
1953 extern u64 cpu_clock(int cpu);
1954 extern u64 local_clock(void);
1955 extern u64 sched_clock_cpu(int cpu);
1958 extern void sched_clock_init(void);
1960 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1961 static inline void sched_clock_tick(void)
1965 static inline void sched_clock_idle_sleep_event(void)
1969 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1974 * Architectures can set this to 1 if they have specified
1975 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1976 * but then during bootup it turns out that sched_clock()
1977 * is reliable after all:
1979 extern int sched_clock_stable;
1981 extern void sched_clock_tick(void);
1982 extern void sched_clock_idle_sleep_event(void);
1983 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1986 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1988 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1989 * The reason for this explicit opt-in is not to have perf penalty with
1990 * slow sched_clocks.
1992 extern void enable_sched_clock_irqtime(void);
1993 extern void disable_sched_clock_irqtime(void);
1995 static inline void enable_sched_clock_irqtime(void) {}
1996 static inline void disable_sched_clock_irqtime(void) {}
1999 extern unsigned long long
2000 task_sched_runtime(struct task_struct *task);
2002 /* sched_exec is called by processes performing an exec */
2004 extern void sched_exec(void);
2006 #define sched_exec() {}
2009 extern void sched_clock_idle_sleep_event(void);
2010 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
2012 #ifdef CONFIG_HOTPLUG_CPU
2013 extern void idle_task_exit(void);
2015 static inline void idle_task_exit(void) {}
2018 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
2019 extern void wake_up_idle_cpu(int cpu);
2021 static inline void wake_up_idle_cpu(int cpu) { }
2024 extern unsigned int sysctl_sched_latency;
2025 extern unsigned int sysctl_sched_min_granularity;
2026 extern unsigned int sysctl_sched_wakeup_granularity;
2027 extern unsigned int sysctl_sched_child_runs_first;
2029 enum sched_tunable_scaling {
2030 SCHED_TUNABLESCALING_NONE,
2031 SCHED_TUNABLESCALING_LOG,
2032 SCHED_TUNABLESCALING_LINEAR,
2033 SCHED_TUNABLESCALING_END,
2035 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
2037 #ifdef CONFIG_SCHED_DEBUG
2038 extern unsigned int sysctl_sched_migration_cost;
2039 extern unsigned int sysctl_sched_nr_migrate;
2040 extern unsigned int sysctl_sched_time_avg;
2041 extern unsigned int sysctl_timer_migration;
2042 extern unsigned int sysctl_sched_shares_window;
2044 int sched_proc_update_handler(struct ctl_table *table, int write,
2045 void __user *buffer, size_t *length,
2048 #ifdef CONFIG_SCHED_DEBUG
2049 static inline unsigned int get_sysctl_timer_migration(void)
2051 return sysctl_timer_migration;
2054 static inline unsigned int get_sysctl_timer_migration(void)
2059 extern unsigned int sysctl_sched_rt_period;
2060 extern int sysctl_sched_rt_runtime;
2062 int sched_rt_handler(struct ctl_table *table, int write,
2063 void __user *buffer, size_t *lenp,
2066 #ifdef CONFIG_SCHED_AUTOGROUP
2067 extern unsigned int sysctl_sched_autogroup_enabled;
2069 extern void sched_autogroup_create_attach(struct task_struct *p);
2070 extern void sched_autogroup_detach(struct task_struct *p);
2071 extern void sched_autogroup_fork(struct signal_struct *sig);
2072 extern void sched_autogroup_exit(struct signal_struct *sig);
2073 #ifdef CONFIG_PROC_FS
2074 extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
2075 extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
2078 static inline void sched_autogroup_create_attach(struct task_struct *p) { }
2079 static inline void sched_autogroup_detach(struct task_struct *p) { }
2080 static inline void sched_autogroup_fork(struct signal_struct *sig) { }
2081 static inline void sched_autogroup_exit(struct signal_struct *sig) { }
2084 #ifdef CONFIG_CFS_BANDWIDTH
2085 extern unsigned int sysctl_sched_cfs_bandwidth_slice;
2088 #ifdef CONFIG_RT_MUTEXES
2089 extern int rt_mutex_getprio(struct task_struct *p);
2090 extern void rt_mutex_setprio(struct task_struct *p, int prio);
2091 extern void rt_mutex_adjust_pi(struct task_struct *p);
2092 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
2094 return tsk->pi_blocked_on != NULL;
2097 static inline int rt_mutex_getprio(struct task_struct *p)
2099 return p->normal_prio;
2101 # define rt_mutex_adjust_pi(p) do { } while (0)
2102 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
2108 extern bool yield_to(struct task_struct *p, bool preempt);
2109 extern void set_user_nice(struct task_struct *p, long nice);
2110 extern int task_prio(const struct task_struct *p);
2111 extern int task_nice(const struct task_struct *p);
2112 extern int can_nice(const struct task_struct *p, const int nice);
2113 extern int task_curr(const struct task_struct *p);
2114 extern int idle_cpu(int cpu);
2115 extern int sched_setscheduler(struct task_struct *, int,
2116 const struct sched_param *);
2117 extern int sched_setscheduler_nocheck(struct task_struct *, int,
2118 const struct sched_param *);
2119 extern struct task_struct *idle_task(int cpu);
2121 * is_idle_task - is the specified task an idle task?
2122 * @p: the task in question.
2124 static inline bool is_idle_task(const struct task_struct *p)
2128 extern struct task_struct *curr_task(int cpu);
2129 extern void set_curr_task(int cpu, struct task_struct *p);
2134 * The default (Linux) execution domain.
2136 extern struct exec_domain default_exec_domain;
2138 union thread_union {
2139 struct thread_info thread_info;
2140 unsigned long stack[THREAD_SIZE/sizeof(long)];
2143 #ifndef __HAVE_ARCH_KSTACK_END
2144 static inline int kstack_end(void *addr)
2146 /* Reliable end of stack detection:
2147 * Some APM bios versions misalign the stack
2149 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
2153 extern union thread_union init_thread_union;
2154 extern struct task_struct init_task;
2156 extern struct mm_struct init_mm;
2158 extern struct pid_namespace init_pid_ns;
2161 * find a task by one of its numerical ids
2163 * find_task_by_pid_ns():
2164 * finds a task by its pid in the specified namespace
2165 * find_task_by_vpid():
2166 * finds a task by its virtual pid
2168 * see also find_vpid() etc in include/linux/pid.h
2171 extern struct task_struct *find_task_by_vpid(pid_t nr);
2172 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2173 struct pid_namespace *ns);
2175 extern void __set_special_pids(struct pid *pid);
2177 /* per-UID process charging. */
2178 extern struct user_struct * alloc_uid(kuid_t);
2179 static inline struct user_struct *get_uid(struct user_struct *u)
2181 atomic_inc(&u->__count);
2184 extern void free_uid(struct user_struct *);
2186 #include <asm/current.h>
2188 extern void xtime_update(unsigned long ticks);
2190 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2191 extern int wake_up_process(struct task_struct *tsk);
2192 extern void wake_up_new_task(struct task_struct *tsk);
2194 extern void kick_process(struct task_struct *tsk);
2196 static inline void kick_process(struct task_struct *tsk) { }
2198 extern void sched_fork(struct task_struct *p);
2199 extern void sched_dead(struct task_struct *p);
2201 extern void proc_caches_init(void);
2202 extern void flush_signals(struct task_struct *);
2203 extern void __flush_signals(struct task_struct *);
2204 extern void ignore_signals(struct task_struct *);
2205 extern void flush_signal_handlers(struct task_struct *, int force_default);
2206 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2208 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2210 unsigned long flags;
2213 spin_lock_irqsave(&tsk->sighand->siglock, flags);
2214 ret = dequeue_signal(tsk, mask, info);
2215 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2220 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2222 extern void unblock_all_signals(void);
2223 extern void release_task(struct task_struct * p);
2224 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2225 extern int force_sigsegv(int, struct task_struct *);
2226 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2227 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2228 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2229 extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
2230 const struct cred *, u32);
2231 extern int kill_pgrp(struct pid *pid, int sig, int priv);
2232 extern int kill_pid(struct pid *pid, int sig, int priv);
2233 extern int kill_proc_info(int, struct siginfo *, pid_t);
2234 extern __must_check bool do_notify_parent(struct task_struct *, int);
2235 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2236 extern void force_sig(int, struct task_struct *);
2237 extern int send_sig(int, struct task_struct *, int);
2238 extern int zap_other_threads(struct task_struct *p);
2239 extern struct sigqueue *sigqueue_alloc(void);
2240 extern void sigqueue_free(struct sigqueue *);
2241 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
2242 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2243 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
2245 static inline void restore_saved_sigmask(void)
2247 if (test_and_clear_restore_sigmask())
2248 __set_current_blocked(¤t->saved_sigmask);
2251 static inline sigset_t *sigmask_to_save(void)
2253 sigset_t *res = ¤t->blocked;
2254 if (unlikely(test_restore_sigmask()))
2255 res = ¤t->saved_sigmask;
2259 static inline int kill_cad_pid(int sig, int priv)
2261 return kill_pid(cad_pid, sig, priv);
2264 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2265 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2266 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2267 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2270 * True if we are on the alternate signal stack.
2272 static inline int on_sig_stack(unsigned long sp)
2274 #ifdef CONFIG_STACK_GROWSUP
2275 return sp >= current->sas_ss_sp &&
2276 sp - current->sas_ss_sp < current->sas_ss_size;
2278 return sp > current->sas_ss_sp &&
2279 sp - current->sas_ss_sp <= current->sas_ss_size;
2283 static inline int sas_ss_flags(unsigned long sp)
2285 return (current->sas_ss_size == 0 ? SS_DISABLE
2286 : on_sig_stack(sp) ? SS_ONSTACK : 0);
2290 * Routines for handling mm_structs
2292 extern struct mm_struct * mm_alloc(void);
2294 /* mmdrop drops the mm and the page tables */
2295 extern void __mmdrop(struct mm_struct *);
2296 static inline void mmdrop(struct mm_struct * mm)
2298 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2302 /* mmput gets rid of the mappings and all user-space */
2303 extern void mmput(struct mm_struct *);
2304 /* Grab a reference to a task's mm, if it is not already going away */
2305 extern struct mm_struct *get_task_mm(struct task_struct *task);
2307 * Grab a reference to a task's mm, if it is not already going away
2308 * and ptrace_may_access with the mode parameter passed to it
2311 extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
2312 /* Remove the current tasks stale references to the old mm_struct */
2313 extern void mm_release(struct task_struct *, struct mm_struct *);
2314 /* Allocate a new mm structure and copy contents from tsk->mm */
2315 extern struct mm_struct *dup_mm(struct task_struct *tsk);
2317 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2318 struct task_struct *, struct pt_regs *);
2319 extern void flush_thread(void);
2320 extern void exit_thread(void);
2322 extern void exit_files(struct task_struct *);
2323 extern void __cleanup_sighand(struct sighand_struct *);
2325 extern void exit_itimers(struct signal_struct *);
2326 extern void flush_itimer_signals(void);
2328 extern void do_group_exit(int);
2330 extern void daemonize(const char *, ...);
2331 extern int allow_signal(int);
2332 extern int disallow_signal(int);
2334 extern int do_execve(const char *,
2335 const char __user * const __user *,
2336 const char __user * const __user *, struct pt_regs *);
2337 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
2338 struct task_struct *fork_idle(int);
2340 extern void set_task_comm(struct task_struct *tsk, char *from);
2341 extern char *get_task_comm(char *to, struct task_struct *tsk);
2344 void scheduler_ipi(void);
2345 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2347 static inline void scheduler_ipi(void) { }
2348 static inline unsigned long wait_task_inactive(struct task_struct *p,
2355 #define next_task(p) \
2356 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2358 #define for_each_process(p) \
2359 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2361 extern bool current_is_single_threaded(void);
2364 * Careful: do_each_thread/while_each_thread is a double loop so
2365 * 'break' will not work as expected - use goto instead.
2367 #define do_each_thread(g, t) \
2368 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2370 #define while_each_thread(g, t) \
2371 while ((t = next_thread(t)) != g)
2373 static inline int get_nr_threads(struct task_struct *tsk)
2375 return tsk->signal->nr_threads;
2378 static inline bool thread_group_leader(struct task_struct *p)
2380 return p->exit_signal >= 0;
2383 /* Do to the insanities of de_thread it is possible for a process
2384 * to have the pid of the thread group leader without actually being
2385 * the thread group leader. For iteration through the pids in proc
2386 * all we care about is that we have a task with the appropriate
2387 * pid, we don't actually care if we have the right task.
2389 static inline int has_group_leader_pid(struct task_struct *p)
2391 return p->pid == p->tgid;
2395 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2397 return p1->tgid == p2->tgid;
2400 static inline struct task_struct *next_thread(const struct task_struct *p)
2402 return list_entry_rcu(p->thread_group.next,
2403 struct task_struct, thread_group);
2406 static inline int thread_group_empty(struct task_struct *p)
2408 return list_empty(&p->thread_group);
2411 #define delay_group_leader(p) \
2412 (thread_group_leader(p) && !thread_group_empty(p))
2415 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2416 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2417 * pins the final release of task.io_context. Also protects ->cpuset and
2418 * ->cgroup.subsys[]. And ->vfork_done.
2420 * Nests both inside and outside of read_lock(&tasklist_lock).
2421 * It must not be nested with write_lock_irq(&tasklist_lock),
2422 * neither inside nor outside.
2424 static inline void task_lock(struct task_struct *p)
2426 spin_lock(&p->alloc_lock);
2429 static inline void task_unlock(struct task_struct *p)
2431 spin_unlock(&p->alloc_lock);
2434 extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2435 unsigned long *flags);
2437 static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2438 unsigned long *flags)
2440 struct sighand_struct *ret;
2442 ret = __lock_task_sighand(tsk, flags);
2443 (void)__cond_lock(&tsk->sighand->siglock, ret);
2447 static inline void unlock_task_sighand(struct task_struct *tsk,
2448 unsigned long *flags)
2450 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2453 #ifdef CONFIG_CGROUPS
2454 static inline void threadgroup_change_begin(struct task_struct *tsk)
2456 down_read(&tsk->signal->group_rwsem);
2458 static inline void threadgroup_change_end(struct task_struct *tsk)
2460 up_read(&tsk->signal->group_rwsem);
2464 * threadgroup_lock - lock threadgroup
2465 * @tsk: member task of the threadgroup to lock
2467 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2468 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2469 * perform exec. This is useful for cases where the threadgroup needs to
2470 * stay stable across blockable operations.
2472 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2473 * synchronization. While held, no new task will be added to threadgroup
2474 * and no existing live task will have its PF_EXITING set.
2476 * During exec, a task goes and puts its thread group through unusual
2477 * changes. After de-threading, exclusive access is assumed to resources
2478 * which are usually shared by tasks in the same group - e.g. sighand may
2479 * be replaced with a new one. Also, the exec'ing task takes over group
2480 * leader role including its pid. Exclude these changes while locked by
2481 * grabbing cred_guard_mutex which is used to synchronize exec path.
2483 static inline void threadgroup_lock(struct task_struct *tsk)
2486 * exec uses exit for de-threading nesting group_rwsem inside
2487 * cred_guard_mutex. Grab cred_guard_mutex first.
2489 mutex_lock(&tsk->signal->cred_guard_mutex);
2490 down_write(&tsk->signal->group_rwsem);
2494 * threadgroup_unlock - unlock threadgroup
2495 * @tsk: member task of the threadgroup to unlock
2497 * Reverse threadgroup_lock().
2499 static inline void threadgroup_unlock(struct task_struct *tsk)
2501 up_write(&tsk->signal->group_rwsem);
2502 mutex_unlock(&tsk->signal->cred_guard_mutex);
2505 static inline void threadgroup_change_begin(struct task_struct *tsk) {}
2506 static inline void threadgroup_change_end(struct task_struct *tsk) {}
2507 static inline void threadgroup_lock(struct task_struct *tsk) {}
2508 static inline void threadgroup_unlock(struct task_struct *tsk) {}
2511 #ifndef __HAVE_THREAD_FUNCTIONS
2513 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2514 #define task_stack_page(task) ((task)->stack)
2516 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2518 *task_thread_info(p) = *task_thread_info(org);
2519 task_thread_info(p)->task = p;
2522 static inline unsigned long *end_of_stack(struct task_struct *p)
2524 return (unsigned long *)(task_thread_info(p) + 1);
2529 static inline int object_is_on_stack(void *obj)
2531 void *stack = task_stack_page(current);
2533 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2536 extern void thread_info_cache_init(void);
2538 #ifdef CONFIG_DEBUG_STACK_USAGE
2539 static inline unsigned long stack_not_used(struct task_struct *p)
2541 unsigned long *n = end_of_stack(p);
2543 do { /* Skip over canary */
2547 return (unsigned long)n - (unsigned long)end_of_stack(p);
2551 /* set thread flags in other task's structures
2552 * - see asm/thread_info.h for TIF_xxxx flags available
2554 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2556 set_ti_thread_flag(task_thread_info(tsk), flag);
2559 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2561 clear_ti_thread_flag(task_thread_info(tsk), flag);
2564 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2566 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2569 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2571 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2574 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2576 return test_ti_thread_flag(task_thread_info(tsk), flag);
2579 static inline void set_tsk_need_resched(struct task_struct *tsk)
2581 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2584 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2586 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2589 static inline int test_tsk_need_resched(struct task_struct *tsk)
2591 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2594 static inline int restart_syscall(void)
2596 set_tsk_thread_flag(current, TIF_SIGPENDING);
2597 return -ERESTARTNOINTR;
2600 static inline int signal_pending(struct task_struct *p)
2602 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2605 static inline int __fatal_signal_pending(struct task_struct *p)
2607 return unlikely(sigismember(&p->pending.signal, SIGKILL));
2610 static inline int fatal_signal_pending(struct task_struct *p)
2612 return signal_pending(p) && __fatal_signal_pending(p);
2615 static inline int signal_pending_state(long state, struct task_struct *p)
2617 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2619 if (!signal_pending(p))
2622 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2625 static inline int need_resched(void)
2627 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
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(); \
2665 * Does a critical section need to be broken due to another
2666 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2667 * but a general need for low latency)
2669 static inline int spin_needbreak(spinlock_t *lock)
2671 #ifdef CONFIG_PREEMPT
2672 return spin_is_contended(lock);
2679 * Thread group CPU time accounting.
2681 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2682 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2684 static inline void thread_group_cputime_init(struct signal_struct *sig)
2686 raw_spin_lock_init(&sig->cputimer.lock);
2690 * Reevaluate whether the task has signals pending delivery.
2691 * Wake the task if so.
2692 * This is required every time the blocked sigset_t changes.
2693 * callers must hold sighand->siglock.
2695 extern void recalc_sigpending_and_wake(struct task_struct *t);
2696 extern void recalc_sigpending(void);
2698 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2701 * Wrappers for p->thread_info->cpu access. No-op on UP.
2705 static inline unsigned int task_cpu(const struct task_struct *p)
2707 return task_thread_info(p)->cpu;
2710 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2714 static inline unsigned int task_cpu(const struct task_struct *p)
2719 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2723 #endif /* CONFIG_SMP */
2725 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2726 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2728 extern void normalize_rt_tasks(void);
2730 #ifdef CONFIG_CGROUP_SCHED
2732 extern struct task_group root_task_group;
2734 extern struct task_group *sched_create_group(struct task_group *parent);
2735 extern void sched_destroy_group(struct task_group *tg);
2736 extern void sched_move_task(struct task_struct *tsk);
2737 #ifdef CONFIG_FAIR_GROUP_SCHED
2738 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2739 extern unsigned long sched_group_shares(struct task_group *tg);
2741 #ifdef CONFIG_RT_GROUP_SCHED
2742 extern int sched_group_set_rt_runtime(struct task_group *tg,
2743 long rt_runtime_us);
2744 extern long sched_group_rt_runtime(struct task_group *tg);
2745 extern int sched_group_set_rt_period(struct task_group *tg,
2747 extern long sched_group_rt_period(struct task_group *tg);
2748 extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2750 #endif /* CONFIG_CGROUP_SCHED */
2752 extern int task_can_switch_user(struct user_struct *up,
2753 struct task_struct *tsk);
2755 #ifdef CONFIG_TASK_XACCT
2756 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2758 tsk->ioac.rchar += amt;
2761 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2763 tsk->ioac.wchar += amt;
2766 static inline void inc_syscr(struct task_struct *tsk)
2771 static inline void inc_syscw(struct task_struct *tsk)
2776 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2780 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2784 static inline void inc_syscr(struct task_struct *tsk)
2788 static inline void inc_syscw(struct task_struct *tsk)
2793 #ifndef TASK_SIZE_OF
2794 #define TASK_SIZE_OF(tsk) TASK_SIZE
2797 #ifdef CONFIG_MM_OWNER
2798 extern void mm_update_next_owner(struct mm_struct *mm);
2799 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2801 static inline void mm_update_next_owner(struct mm_struct *mm)
2805 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2808 #endif /* CONFIG_MM_OWNER */
2810 static inline unsigned long task_rlimit(const struct task_struct *tsk,
2813 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2816 static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2819 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2822 static inline unsigned long rlimit(unsigned int limit)
2824 return task_rlimit(current, limit);
2827 static inline unsigned long rlimit_max(unsigned int limit)
2829 return task_rlimit_max(current, limit);
2832 #endif /* __KERNEL__ */