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>
94 #include <asm/processor.h>
97 struct futex_pi_state;
98 struct robust_list_head;
101 struct perf_event_context;
105 * List of flags we want to share for kernel threads,
106 * if only because they are not used by them anyway.
108 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
111 * These are the constant used to fake the fixed-point load-average
112 * counting. Some notes:
113 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
114 * a load-average precision of 10 bits integer + 11 bits fractional
115 * - if you want to count load-averages more often, you need more
116 * precision, or rounding will get you. With 2-second counting freq,
117 * the EXP_n values would be 1981, 2034 and 2043 if still using only
120 extern unsigned long avenrun[]; /* Load averages */
121 extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
123 #define FSHIFT 11 /* nr of bits of precision */
124 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
125 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
126 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
127 #define EXP_5 2014 /* 1/exp(5sec/5min) */
128 #define EXP_15 2037 /* 1/exp(5sec/15min) */
130 #define CALC_LOAD(load,exp,n) \
132 load += n*(FIXED_1-exp); \
135 extern unsigned long total_forks;
136 extern int nr_threads;
137 DECLARE_PER_CPU(unsigned long, process_counts);
138 extern int nr_processes(void);
139 extern unsigned long nr_running(void);
140 extern unsigned long nr_uninterruptible(void);
141 extern unsigned long nr_iowait(void);
142 extern unsigned long nr_iowait_cpu(int cpu);
143 extern unsigned long this_cpu_load(void);
146 extern void calc_global_load(unsigned long ticks);
148 extern unsigned long get_parent_ip(unsigned long addr);
153 #ifdef CONFIG_SCHED_DEBUG
154 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
155 extern void proc_sched_set_task(struct task_struct *p);
157 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
160 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
163 static inline void proc_sched_set_task(struct task_struct *p)
167 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
173 * Task state bitmask. NOTE! These bits are also
174 * encoded in fs/proc/array.c: get_task_state().
176 * We have two separate sets of flags: task->state
177 * is about runnability, while task->exit_state are
178 * about the task exiting. Confusing, but this way
179 * modifying one set can't modify the other one by
182 #define TASK_RUNNING 0
183 #define TASK_INTERRUPTIBLE 1
184 #define TASK_UNINTERRUPTIBLE 2
185 #define __TASK_STOPPED 4
186 #define __TASK_TRACED 8
187 /* in tsk->exit_state */
188 #define EXIT_ZOMBIE 16
190 /* in tsk->state again */
192 #define TASK_WAKEKILL 128
193 #define TASK_WAKING 256
194 #define TASK_STATE_MAX 512
196 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
198 extern char ___assert_task_state[1 - 2*!!(
199 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
201 /* Convenience macros for the sake of set_task_state */
202 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
203 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
204 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
206 /* Convenience macros for the sake of wake_up */
207 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
208 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
210 /* get_task_state() */
211 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
212 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
215 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
216 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
217 #define task_is_dead(task) ((task)->exit_state != 0)
218 #define task_is_stopped_or_traced(task) \
219 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
220 #define task_contributes_to_load(task) \
221 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
222 (task->flags & PF_FROZEN) == 0)
224 #define __set_task_state(tsk, state_value) \
225 do { (tsk)->state = (state_value); } while (0)
226 #define set_task_state(tsk, state_value) \
227 set_mb((tsk)->state, (state_value))
230 * set_current_state() includes a barrier so that the write of current->state
231 * is correctly serialised wrt the caller's subsequent test of whether to
234 * set_current_state(TASK_UNINTERRUPTIBLE);
235 * if (do_i_need_to_sleep())
238 * If the caller does not need such serialisation then use __set_current_state()
240 #define __set_current_state(state_value) \
241 do { current->state = (state_value); } while (0)
242 #define set_current_state(state_value) \
243 set_mb(current->state, (state_value))
245 /* Task command name length */
246 #define TASK_COMM_LEN 16
248 #include <linux/spinlock.h>
251 * This serializes "schedule()" and also protects
252 * the run-queue from deletions/modifications (but
253 * _adding_ to the beginning of the run-queue has
256 extern rwlock_t tasklist_lock;
257 extern spinlock_t mmlist_lock;
261 #ifdef CONFIG_PROVE_RCU
262 extern int lockdep_tasklist_lock_is_held(void);
263 #endif /* #ifdef CONFIG_PROVE_RCU */
265 extern void sched_init(void);
266 extern void sched_init_smp(void);
267 extern asmlinkage void schedule_tail(struct task_struct *prev);
268 extern void init_idle(struct task_struct *idle, int cpu);
269 extern void init_idle_bootup_task(struct task_struct *idle);
271 extern int runqueue_is_locked(int cpu);
273 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
274 extern void select_nohz_load_balancer(int stop_tick);
275 extern void set_cpu_sd_state_idle(void);
276 extern int get_nohz_timer_target(void);
278 static inline void select_nohz_load_balancer(int stop_tick) { }
279 static inline void set_cpu_sd_state_idle(void) { }
283 * Only dump TASK_* tasks. (0 for all tasks)
285 extern void show_state_filter(unsigned long state_filter);
287 static inline void show_state(void)
289 show_state_filter(0);
292 extern void show_regs(struct pt_regs *);
295 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
296 * task), SP is the stack pointer of the first frame that should be shown in the back
297 * trace (or NULL if the entire call-chain of the task should be shown).
299 extern void show_stack(struct task_struct *task, unsigned long *sp);
301 void io_schedule(void);
302 long io_schedule_timeout(long timeout);
304 extern void cpu_init (void);
305 extern void trap_init(void);
306 extern void update_process_times(int user);
307 extern void scheduler_tick(void);
309 extern void sched_show_task(struct task_struct *p);
311 #ifdef CONFIG_LOCKUP_DETECTOR
312 extern void touch_softlockup_watchdog(void);
313 extern void touch_softlockup_watchdog_sync(void);
314 extern void touch_all_softlockup_watchdogs(void);
315 extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
317 size_t *lenp, loff_t *ppos);
318 extern unsigned int softlockup_panic;
319 void lockup_detector_init(void);
321 static inline void touch_softlockup_watchdog(void)
324 static inline void touch_softlockup_watchdog_sync(void)
327 static inline void touch_all_softlockup_watchdogs(void)
330 static inline void lockup_detector_init(void)
335 #ifdef CONFIG_DETECT_HUNG_TASK
336 extern unsigned int sysctl_hung_task_panic;
337 extern unsigned long sysctl_hung_task_check_count;
338 extern unsigned long sysctl_hung_task_timeout_secs;
339 extern unsigned long sysctl_hung_task_warnings;
340 extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
342 size_t *lenp, loff_t *ppos);
344 /* Avoid need for ifdefs elsewhere in the code */
345 enum { sysctl_hung_task_timeout_secs = 0 };
348 /* Attach to any functions which should be ignored in wchan output. */
349 #define __sched __attribute__((__section__(".sched.text")))
351 /* Linker adds these: start and end of __sched functions */
352 extern char __sched_text_start[], __sched_text_end[];
354 /* Is this address in the __sched functions? */
355 extern int in_sched_functions(unsigned long addr);
357 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
358 extern signed long schedule_timeout(signed long timeout);
359 extern signed long schedule_timeout_interruptible(signed long timeout);
360 extern signed long schedule_timeout_killable(signed long timeout);
361 extern signed long schedule_timeout_uninterruptible(signed long timeout);
362 asmlinkage void schedule(void);
363 extern void schedule_preempt_disabled(void);
364 extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);
367 struct user_namespace;
370 * Default maximum number of active map areas, this limits the number of vmas
371 * per mm struct. Users can overwrite this number by sysctl but there is a
374 * When a program's coredump is generated as ELF format, a section is created
375 * per a vma. In ELF, the number of sections is represented in unsigned short.
376 * This means the number of sections should be smaller than 65535 at coredump.
377 * Because the kernel adds some informative sections to a image of program at
378 * generating coredump, we need some margin. The number of extra sections is
379 * 1-3 now and depends on arch. We use "5" as safe margin, here.
381 #define MAPCOUNT_ELF_CORE_MARGIN (5)
382 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
384 extern int sysctl_max_map_count;
386 #include <linux/aio.h>
389 extern void arch_pick_mmap_layout(struct mm_struct *mm);
391 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
392 unsigned long, unsigned long);
394 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
395 unsigned long len, unsigned long pgoff,
396 unsigned long flags);
397 extern void arch_unmap_area(struct mm_struct *, unsigned long);
398 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
400 static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
404 extern void set_dumpable(struct mm_struct *mm, int value);
405 extern int get_dumpable(struct mm_struct *mm);
409 #define MMF_DUMPABLE 0 /* core dump is permitted */
410 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
412 #define MMF_DUMPABLE_BITS 2
413 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
415 /* coredump filter bits */
416 #define MMF_DUMP_ANON_PRIVATE 2
417 #define MMF_DUMP_ANON_SHARED 3
418 #define MMF_DUMP_MAPPED_PRIVATE 4
419 #define MMF_DUMP_MAPPED_SHARED 5
420 #define MMF_DUMP_ELF_HEADERS 6
421 #define MMF_DUMP_HUGETLB_PRIVATE 7
422 #define MMF_DUMP_HUGETLB_SHARED 8
424 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
425 #define MMF_DUMP_FILTER_BITS 7
426 #define MMF_DUMP_FILTER_MASK \
427 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
428 #define MMF_DUMP_FILTER_DEFAULT \
429 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
430 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
432 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
433 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
435 # define MMF_DUMP_MASK_DEFAULT_ELF 0
437 /* leave room for more dump flags */
438 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
439 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
441 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
443 struct sighand_struct {
445 struct k_sigaction action[_NSIG];
447 wait_queue_head_t signalfd_wqh;
450 struct pacct_struct {
453 unsigned long ac_mem;
454 cputime_t ac_utime, ac_stime;
455 unsigned long ac_minflt, ac_majflt;
466 * struct task_cputime - collected CPU time counts
467 * @utime: time spent in user mode, in &cputime_t units
468 * @stime: time spent in kernel mode, in &cputime_t units
469 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
471 * This structure groups together three kinds of CPU time that are
472 * tracked for threads and thread groups. Most things considering
473 * CPU time want to group these counts together and treat all three
474 * of them in parallel.
476 struct task_cputime {
479 unsigned long long sum_exec_runtime;
481 /* Alternate field names when used to cache expirations. */
482 #define prof_exp stime
483 #define virt_exp utime
484 #define sched_exp sum_exec_runtime
486 #define INIT_CPUTIME \
487 (struct task_cputime) { \
490 .sum_exec_runtime = 0, \
494 * Disable preemption until the scheduler is running.
495 * Reset by start_kernel()->sched_init()->init_idle().
497 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
498 * before the scheduler is active -- see should_resched().
500 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
503 * struct thread_group_cputimer - thread group interval timer counts
504 * @cputime: thread group interval timers.
505 * @running: non-zero when there are timers running and
506 * @cputime receives updates.
507 * @lock: lock for fields in this struct.
509 * This structure contains the version of task_cputime, above, that is
510 * used for thread group CPU timer calculations.
512 struct thread_group_cputimer {
513 struct task_cputime cputime;
518 #include <linux/rwsem.h>
522 * NOTE! "signal_struct" does not have its own
523 * locking, because a shared signal_struct always
524 * implies a shared sighand_struct, so locking
525 * sighand_struct is always a proper superset of
526 * the locking of signal_struct.
528 struct signal_struct {
533 wait_queue_head_t wait_chldexit; /* for wait4() */
535 /* current thread group signal load-balancing target: */
536 struct task_struct *curr_target;
538 /* shared signal handling: */
539 struct sigpending shared_pending;
541 /* thread group exit support */
544 * - notify group_exit_task when ->count is equal to notify_count
545 * - everyone except group_exit_task is stopped during signal delivery
546 * of fatal signals, group_exit_task processes the signal.
549 struct task_struct *group_exit_task;
551 /* thread group stop support, overloads group_exit_code too */
552 int group_stop_count;
553 unsigned int flags; /* see SIGNAL_* flags below */
555 /* POSIX.1b Interval Timers */
556 struct list_head posix_timers;
558 /* ITIMER_REAL timer for the process */
559 struct hrtimer real_timer;
560 struct pid *leader_pid;
561 ktime_t it_real_incr;
564 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
565 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
566 * values are defined to 0 and 1 respectively
568 struct cpu_itimer it[2];
571 * Thread group totals for process CPU timers.
572 * See thread_group_cputimer(), et al, for details.
574 struct thread_group_cputimer cputimer;
576 /* Earliest-expiration cache. */
577 struct task_cputime cputime_expires;
579 struct list_head cpu_timers[3];
581 struct pid *tty_old_pgrp;
583 /* boolean value for session group leader */
586 struct tty_struct *tty; /* NULL if no tty */
588 #ifdef CONFIG_SCHED_AUTOGROUP
589 struct autogroup *autogroup;
592 * Cumulative resource counters for dead threads in the group,
593 * and for reaped dead child processes forked by this group.
594 * Live threads maintain their own counters and add to these
595 * in __exit_signal, except for the group leader.
597 cputime_t utime, stime, cutime, cstime;
600 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
601 cputime_t prev_utime, prev_stime;
603 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
604 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
605 unsigned long inblock, oublock, cinblock, coublock;
606 unsigned long maxrss, cmaxrss;
607 struct task_io_accounting ioac;
610 * Cumulative ns of schedule CPU time fo dead threads in the
611 * group, not including a zombie group leader, (This only differs
612 * from jiffies_to_ns(utime + stime) if sched_clock uses something
613 * other than jiffies.)
615 unsigned long long sum_sched_runtime;
618 * We don't bother to synchronize most readers of this at all,
619 * because there is no reader checking a limit that actually needs
620 * to get both rlim_cur and rlim_max atomically, and either one
621 * alone is a single word that can safely be read normally.
622 * getrlimit/setrlimit use task_lock(current->group_leader) to
623 * protect this instead of the siglock, because they really
624 * have no need to disable irqs.
626 struct rlimit rlim[RLIM_NLIMITS];
628 #ifdef CONFIG_BSD_PROCESS_ACCT
629 struct pacct_struct pacct; /* per-process accounting information */
631 #ifdef CONFIG_TASKSTATS
632 struct taskstats *stats;
636 struct tty_audit_buf *tty_audit_buf;
638 #ifdef CONFIG_CGROUPS
640 * group_rwsem prevents new tasks from entering the threadgroup and
641 * member tasks from exiting,a more specifically, setting of
642 * PF_EXITING. fork and exit paths are protected with this rwsem
643 * using threadgroup_change_begin/end(). Users which require
644 * threadgroup to remain stable should use threadgroup_[un]lock()
645 * which also takes care of exec path. Currently, cgroup is the
648 struct rw_semaphore group_rwsem;
651 int oom_adj; /* OOM kill score adjustment (bit shift) */
652 int oom_score_adj; /* OOM kill score adjustment */
653 int oom_score_adj_min; /* OOM kill score adjustment minimum value.
654 * Only settable by CAP_SYS_RESOURCE. */
656 struct mutex cred_guard_mutex; /* guard against foreign influences on
657 * credential calculations
658 * (notably. ptrace) */
661 /* Context switch must be unlocked if interrupts are to be enabled */
662 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
663 # define __ARCH_WANT_UNLOCKED_CTXSW
667 * Bits in flags field of signal_struct.
669 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
670 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
671 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
673 * Pending notifications to parent.
675 #define SIGNAL_CLD_STOPPED 0x00000010
676 #define SIGNAL_CLD_CONTINUED 0x00000020
677 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
679 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
681 /* If true, all threads except ->group_exit_task have pending SIGKILL */
682 static inline int signal_group_exit(const struct signal_struct *sig)
684 return (sig->flags & SIGNAL_GROUP_EXIT) ||
685 (sig->group_exit_task != NULL);
689 * Some day this will be a full-fledged user tracking system..
692 atomic_t __count; /* reference count */
693 atomic_t processes; /* How many processes does this user have? */
694 atomic_t files; /* How many open files does this user have? */
695 atomic_t sigpending; /* How many pending signals does this user have? */
696 #ifdef CONFIG_INOTIFY_USER
697 atomic_t inotify_watches; /* How many inotify watches does this user have? */
698 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
700 #ifdef CONFIG_FANOTIFY
701 atomic_t fanotify_listeners;
704 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
706 #ifdef CONFIG_POSIX_MQUEUE
707 /* protected by mq_lock */
708 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
710 unsigned long locked_shm; /* How many pages of mlocked shm ? */
713 struct key *uid_keyring; /* UID specific keyring */
714 struct key *session_keyring; /* UID's default session keyring */
717 /* Hash table maintenance information */
718 struct hlist_node uidhash_node;
720 struct user_namespace *user_ns;
722 #ifdef CONFIG_PERF_EVENTS
723 atomic_long_t locked_vm;
727 extern int uids_sysfs_init(void);
729 extern struct user_struct *find_user(uid_t);
731 extern struct user_struct root_user;
732 #define INIT_USER (&root_user)
735 struct backing_dev_info;
736 struct reclaim_state;
738 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
740 /* cumulative counters */
741 unsigned long pcount; /* # of times run on this cpu */
742 unsigned long long run_delay; /* time spent waiting on a runqueue */
745 unsigned long long last_arrival,/* when we last ran on a cpu */
746 last_queued; /* when we were last queued to run */
748 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
750 #ifdef CONFIG_TASK_DELAY_ACCT
751 struct task_delay_info {
753 unsigned int flags; /* Private per-task flags */
755 /* For each stat XXX, add following, aligned appropriately
757 * struct timespec XXX_start, XXX_end;
761 * Atomicity of updates to XXX_delay, XXX_count protected by
762 * single lock above (split into XXX_lock if contention is an issue).
766 * XXX_count is incremented on every XXX operation, the delay
767 * associated with the operation is added to XXX_delay.
768 * XXX_delay contains the accumulated delay time in nanoseconds.
770 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
771 u64 blkio_delay; /* wait for sync block io completion */
772 u64 swapin_delay; /* wait for swapin block io completion */
773 u32 blkio_count; /* total count of the number of sync block */
774 /* io operations performed */
775 u32 swapin_count; /* total count of the number of swapin block */
776 /* io operations performed */
778 struct timespec freepages_start, freepages_end;
779 u64 freepages_delay; /* wait for memory reclaim */
780 u32 freepages_count; /* total count of memory reclaim */
782 #endif /* CONFIG_TASK_DELAY_ACCT */
784 static inline int sched_info_on(void)
786 #ifdef CONFIG_SCHEDSTATS
788 #elif defined(CONFIG_TASK_DELAY_ACCT)
789 extern int delayacct_on;
804 * Increase resolution of nice-level calculations for 64-bit architectures.
805 * The extra resolution improves shares distribution and load balancing of
806 * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
807 * hierarchies, especially on larger systems. This is not a user-visible change
808 * and does not change the user-interface for setting shares/weights.
810 * We increase resolution only if we have enough bits to allow this increased
811 * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
812 * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
815 #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */
816 # define SCHED_LOAD_RESOLUTION 10
817 # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION)
818 # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION)
820 # define SCHED_LOAD_RESOLUTION 0
821 # define scale_load(w) (w)
822 # define scale_load_down(w) (w)
825 #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION)
826 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
829 * Increase resolution of cpu_power calculations
831 #define SCHED_POWER_SHIFT 10
832 #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
835 * sched-domains (multiprocessor balancing) declarations:
838 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
839 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
840 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
841 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
842 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
843 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
844 #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */
845 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
846 #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */
847 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
848 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
849 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
850 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
851 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
853 enum powersavings_balance_level {
854 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */
855 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package
856 * first for long running threads
858 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle
859 * cpu package for power savings
861 MAX_POWERSAVINGS_BALANCE_LEVELS
864 extern int sched_mc_power_savings, sched_smt_power_savings;
866 static inline int sd_balance_for_mc_power(void)
868 if (sched_smt_power_savings)
869 return SD_POWERSAVINGS_BALANCE;
871 if (!sched_mc_power_savings)
872 return SD_PREFER_SIBLING;
877 static inline int sd_balance_for_package_power(void)
879 if (sched_mc_power_savings | sched_smt_power_savings)
880 return SD_POWERSAVINGS_BALANCE;
882 return SD_PREFER_SIBLING;
885 extern int __weak arch_sd_sibiling_asym_packing(void);
888 * Optimise SD flags for power savings:
889 * SD_BALANCE_NEWIDLE helps aggressive task consolidation and power savings.
890 * Keep default SD flags if sched_{smt,mc}_power_saving=0
893 static inline int sd_power_saving_flags(void)
895 if (sched_mc_power_savings | sched_smt_power_savings)
896 return SD_BALANCE_NEWIDLE;
901 struct sched_group_power {
904 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
907 unsigned int power, power_orig;
908 unsigned long next_update;
910 * Number of busy cpus in this group.
912 atomic_t nr_busy_cpus;
916 struct sched_group *next; /* Must be a circular list */
919 unsigned int group_weight;
920 struct sched_group_power *sgp;
923 * The CPUs this group covers.
925 * NOTE: this field is variable length. (Allocated dynamically
926 * by attaching extra space to the end of the structure,
927 * depending on how many CPUs the kernel has booted up with)
929 unsigned long cpumask[0];
932 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
934 return to_cpumask(sg->cpumask);
938 * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
939 * @group: The group whose first cpu is to be returned.
941 static inline unsigned int group_first_cpu(struct sched_group *group)
943 return cpumask_first(sched_group_cpus(group));
946 struct sched_domain_attr {
947 int relax_domain_level;
950 #define SD_ATTR_INIT (struct sched_domain_attr) { \
951 .relax_domain_level = -1, \
954 extern int sched_domain_level_max;
956 struct sched_domain {
957 /* These fields must be setup */
958 struct sched_domain *parent; /* top domain must be null terminated */
959 struct sched_domain *child; /* bottom domain must be null terminated */
960 struct sched_group *groups; /* the balancing groups of the domain */
961 unsigned long min_interval; /* Minimum balance interval ms */
962 unsigned long max_interval; /* Maximum balance interval ms */
963 unsigned int busy_factor; /* less balancing by factor if busy */
964 unsigned int imbalance_pct; /* No balance until over watermark */
965 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
966 unsigned int busy_idx;
967 unsigned int idle_idx;
968 unsigned int newidle_idx;
969 unsigned int wake_idx;
970 unsigned int forkexec_idx;
971 unsigned int smt_gain;
972 int flags; /* See SD_* */
975 /* Runtime fields. */
976 unsigned long last_balance; /* init to jiffies. units in jiffies */
977 unsigned int balance_interval; /* initialise to 1. units in ms. */
978 unsigned int nr_balance_failed; /* initialise to 0 */
982 #ifdef CONFIG_SCHEDSTATS
983 /* load_balance() stats */
984 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
985 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
986 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
987 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
988 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
989 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
990 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
991 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
993 /* Active load balancing */
994 unsigned int alb_count;
995 unsigned int alb_failed;
996 unsigned int alb_pushed;
998 /* SD_BALANCE_EXEC stats */
999 unsigned int sbe_count;
1000 unsigned int sbe_balanced;
1001 unsigned int sbe_pushed;
1003 /* SD_BALANCE_FORK stats */
1004 unsigned int sbf_count;
1005 unsigned int sbf_balanced;
1006 unsigned int sbf_pushed;
1008 /* try_to_wake_up() stats */
1009 unsigned int ttwu_wake_remote;
1010 unsigned int ttwu_move_affine;
1011 unsigned int ttwu_move_balance;
1013 #ifdef CONFIG_SCHED_DEBUG
1017 void *private; /* used during construction */
1018 struct rcu_head rcu; /* used during destruction */
1021 unsigned int span_weight;
1023 * Span of all CPUs in this domain.
1025 * NOTE: this field is variable length. (Allocated dynamically
1026 * by attaching extra space to the end of the structure,
1027 * depending on how many CPUs the kernel has booted up with)
1029 unsigned long span[0];
1032 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
1034 return to_cpumask(sd->span);
1037 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1038 struct sched_domain_attr *dattr_new);
1040 /* Allocate an array of sched domains, for partition_sched_domains(). */
1041 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
1042 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
1044 /* Test a flag in parent sched domain */
1045 static inline int test_sd_parent(struct sched_domain *sd, int flag)
1047 if (sd->parent && (sd->parent->flags & flag))
1053 unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
1054 unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
1056 bool cpus_share_cache(int this_cpu, int that_cpu);
1058 #else /* CONFIG_SMP */
1060 struct sched_domain_attr;
1063 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1064 struct sched_domain_attr *dattr_new)
1068 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
1073 #endif /* !CONFIG_SMP */
1076 struct io_context; /* See blkdev.h */
1079 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1080 extern void prefetch_stack(struct task_struct *t);
1082 static inline void prefetch_stack(struct task_struct *t) { }
1085 struct audit_context; /* See audit.c */
1087 struct pipe_inode_info;
1088 struct uts_namespace;
1091 struct sched_domain;
1096 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
1097 #define WF_FORK 0x02 /* child wakeup after fork */
1098 #define WF_MIGRATED 0x04 /* internal use, task got migrated */
1100 #define ENQUEUE_WAKEUP 1
1101 #define ENQUEUE_HEAD 2
1103 #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */
1105 #define ENQUEUE_WAKING 0
1108 #define DEQUEUE_SLEEP 1
1110 struct sched_class {
1111 const struct sched_class *next;
1113 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
1114 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
1115 void (*yield_task) (struct rq *rq);
1116 bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt);
1118 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
1120 struct task_struct * (*pick_next_task) (struct rq *rq);
1121 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
1124 int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);
1126 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1127 void (*post_schedule) (struct rq *this_rq);
1128 void (*task_waking) (struct task_struct *task);
1129 void (*task_woken) (struct rq *this_rq, struct task_struct *task);
1131 void (*set_cpus_allowed)(struct task_struct *p,
1132 const struct cpumask *newmask);
1134 void (*rq_online)(struct rq *rq);
1135 void (*rq_offline)(struct rq *rq);
1138 void (*set_curr_task) (struct rq *rq);
1139 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1140 void (*task_fork) (struct task_struct *p);
1142 void (*switched_from) (struct rq *this_rq, struct task_struct *task);
1143 void (*switched_to) (struct rq *this_rq, struct task_struct *task);
1144 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1147 unsigned int (*get_rr_interval) (struct rq *rq,
1148 struct task_struct *task);
1150 #ifdef CONFIG_FAIR_GROUP_SCHED
1151 void (*task_move_group) (struct task_struct *p, int on_rq);
1155 struct load_weight {
1156 unsigned long weight, inv_weight;
1159 #ifdef CONFIG_SCHEDSTATS
1160 struct sched_statistics {
1170 s64 sum_sleep_runtime;
1177 u64 nr_migrations_cold;
1178 u64 nr_failed_migrations_affine;
1179 u64 nr_failed_migrations_running;
1180 u64 nr_failed_migrations_hot;
1181 u64 nr_forced_migrations;
1184 u64 nr_wakeups_sync;
1185 u64 nr_wakeups_migrate;
1186 u64 nr_wakeups_local;
1187 u64 nr_wakeups_remote;
1188 u64 nr_wakeups_affine;
1189 u64 nr_wakeups_affine_attempts;
1190 u64 nr_wakeups_passive;
1191 u64 nr_wakeups_idle;
1195 struct sched_entity {
1196 struct load_weight load; /* for load-balancing */
1197 struct rb_node run_node;
1198 struct list_head group_node;
1202 u64 sum_exec_runtime;
1204 u64 prev_sum_exec_runtime;
1208 #ifdef CONFIG_SCHEDSTATS
1209 struct sched_statistics statistics;
1212 #ifdef CONFIG_FAIR_GROUP_SCHED
1213 struct sched_entity *parent;
1214 /* rq on which this entity is (to be) queued: */
1215 struct cfs_rq *cfs_rq;
1216 /* rq "owned" by this entity/group: */
1217 struct cfs_rq *my_q;
1221 struct sched_rt_entity {
1222 struct list_head run_list;
1223 unsigned long timeout;
1224 unsigned int time_slice;
1225 int nr_cpus_allowed;
1227 struct sched_rt_entity *back;
1228 #ifdef CONFIG_RT_GROUP_SCHED
1229 struct sched_rt_entity *parent;
1230 /* rq on which this entity is (to be) queued: */
1231 struct rt_rq *rt_rq;
1232 /* rq "owned" by this entity/group: */
1238 * default timeslice is 100 msecs (used only for SCHED_RR tasks).
1239 * Timeslices get refilled after they expire.
1241 #define RR_TIMESLICE (100 * HZ / 1000)
1245 enum perf_event_task_context {
1246 perf_invalid_context = -1,
1247 perf_hw_context = 0,
1249 perf_nr_task_contexts,
1252 struct task_struct {
1253 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1256 unsigned int flags; /* per process flags, defined below */
1257 unsigned int ptrace;
1260 struct llist_node wake_entry;
1265 int prio, static_prio, normal_prio;
1266 unsigned int rt_priority;
1267 const struct sched_class *sched_class;
1268 struct sched_entity se;
1269 struct sched_rt_entity rt;
1271 #ifdef CONFIG_PREEMPT_NOTIFIERS
1272 /* list of struct preempt_notifier: */
1273 struct hlist_head preempt_notifiers;
1277 * fpu_counter contains the number of consecutive context switches
1278 * that the FPU is used. If this is over a threshold, the lazy fpu
1279 * saving becomes unlazy to save the trap. This is an unsigned char
1280 * so that after 256 times the counter wraps and the behavior turns
1281 * lazy again; this to deal with bursty apps that only use FPU for
1284 unsigned char fpu_counter;
1285 #ifdef CONFIG_BLK_DEV_IO_TRACE
1286 unsigned int btrace_seq;
1289 unsigned int policy;
1290 cpumask_t cpus_allowed;
1292 #ifdef CONFIG_PREEMPT_RCU
1293 int rcu_read_lock_nesting;
1294 char rcu_read_unlock_special;
1295 struct list_head rcu_node_entry;
1296 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1297 #ifdef CONFIG_TREE_PREEMPT_RCU
1298 struct rcu_node *rcu_blocked_node;
1299 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1300 #ifdef CONFIG_RCU_BOOST
1301 struct rt_mutex *rcu_boost_mutex;
1302 #endif /* #ifdef CONFIG_RCU_BOOST */
1304 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1305 struct sched_info sched_info;
1308 struct list_head tasks;
1310 struct plist_node pushable_tasks;
1313 struct mm_struct *mm, *active_mm;
1314 #ifdef CONFIG_COMPAT_BRK
1315 unsigned brk_randomized:1;
1317 #if defined(SPLIT_RSS_COUNTING)
1318 struct task_rss_stat rss_stat;
1322 int exit_code, exit_signal;
1323 int pdeath_signal; /* The signal sent when the parent dies */
1324 unsigned int jobctl; /* JOBCTL_*, siglock protected */
1326 unsigned int personality;
1327 unsigned did_exec:1;
1328 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1330 unsigned in_iowait:1;
1333 /* Revert to default priority/policy when forking */
1334 unsigned sched_reset_on_fork:1;
1335 unsigned sched_contributes_to_load:1;
1337 #ifdef CONFIG_GENERIC_HARDIRQS
1338 /* IRQ handler threads */
1339 unsigned irq_thread:1;
1345 #ifdef CONFIG_CC_STACKPROTECTOR
1346 /* Canary value for the -fstack-protector gcc feature */
1347 unsigned long stack_canary;
1351 * pointers to (original) parent process, youngest child, younger sibling,
1352 * older sibling, respectively. (p->father can be replaced with
1353 * p->real_parent->pid)
1355 struct task_struct __rcu *real_parent; /* real parent process */
1356 struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
1358 * children/sibling forms the list of my natural children
1360 struct list_head children; /* list of my children */
1361 struct list_head sibling; /* linkage in my parent's children list */
1362 struct task_struct *group_leader; /* threadgroup leader */
1365 * ptraced is the list of tasks this task is using ptrace on.
1366 * This includes both natural children and PTRACE_ATTACH targets.
1367 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1369 struct list_head ptraced;
1370 struct list_head ptrace_entry;
1372 /* PID/PID hash table linkage. */
1373 struct pid_link pids[PIDTYPE_MAX];
1374 struct list_head thread_group;
1376 struct completion *vfork_done; /* for vfork() */
1377 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1378 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1380 cputime_t utime, stime, utimescaled, stimescaled;
1382 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
1383 cputime_t prev_utime, prev_stime;
1385 unsigned long nvcsw, nivcsw; /* context switch counts */
1386 struct timespec start_time; /* monotonic time */
1387 struct timespec real_start_time; /* boot based time */
1388 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1389 unsigned long min_flt, maj_flt;
1391 struct task_cputime cputime_expires;
1392 struct list_head cpu_timers[3];
1394 /* process credentials */
1395 const struct cred __rcu *real_cred; /* objective and real subjective task
1396 * credentials (COW) */
1397 const struct cred __rcu *cred; /* effective (overridable) subjective task
1398 * credentials (COW) */
1399 struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
1401 char comm[TASK_COMM_LEN]; /* executable name excluding path
1402 - access with [gs]et_task_comm (which lock
1403 it with task_lock())
1404 - initialized normally by setup_new_exec */
1405 /* file system info */
1406 int link_count, total_link_count;
1407 #ifdef CONFIG_SYSVIPC
1409 struct sysv_sem sysvsem;
1411 #ifdef CONFIG_DETECT_HUNG_TASK
1412 /* hung task detection */
1413 unsigned long last_switch_count;
1415 /* CPU-specific state of this task */
1416 struct thread_struct thread;
1417 /* filesystem information */
1418 struct fs_struct *fs;
1419 /* open file information */
1420 struct files_struct *files;
1422 struct nsproxy *nsproxy;
1423 /* signal handlers */
1424 struct signal_struct *signal;
1425 struct sighand_struct *sighand;
1427 sigset_t blocked, real_blocked;
1428 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1429 struct sigpending pending;
1431 unsigned long sas_ss_sp;
1433 int (*notifier)(void *priv);
1434 void *notifier_data;
1435 sigset_t *notifier_mask;
1436 struct audit_context *audit_context;
1437 #ifdef CONFIG_AUDITSYSCALL
1439 unsigned int sessionid;
1443 /* Thread group tracking */
1446 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1448 spinlock_t alloc_lock;
1450 /* Protection of the PI data structures: */
1451 raw_spinlock_t pi_lock;
1453 #ifdef CONFIG_RT_MUTEXES
1454 /* PI waiters blocked on a rt_mutex held by this task */
1455 struct plist_head pi_waiters;
1456 /* Deadlock detection and priority inheritance handling */
1457 struct rt_mutex_waiter *pi_blocked_on;
1460 #ifdef CONFIG_DEBUG_MUTEXES
1461 /* mutex deadlock detection */
1462 struct mutex_waiter *blocked_on;
1464 #ifdef CONFIG_TRACE_IRQFLAGS
1465 unsigned int irq_events;
1466 unsigned long hardirq_enable_ip;
1467 unsigned long hardirq_disable_ip;
1468 unsigned int hardirq_enable_event;
1469 unsigned int hardirq_disable_event;
1470 int hardirqs_enabled;
1471 int hardirq_context;
1472 unsigned long softirq_disable_ip;
1473 unsigned long softirq_enable_ip;
1474 unsigned int softirq_disable_event;
1475 unsigned int softirq_enable_event;
1476 int softirqs_enabled;
1477 int softirq_context;
1479 #ifdef CONFIG_LOCKDEP
1480 # define MAX_LOCK_DEPTH 48UL
1483 unsigned int lockdep_recursion;
1484 struct held_lock held_locks[MAX_LOCK_DEPTH];
1485 gfp_t lockdep_reclaim_gfp;
1488 /* journalling filesystem info */
1491 /* stacked block device info */
1492 struct bio_list *bio_list;
1495 /* stack plugging */
1496 struct blk_plug *plug;
1500 struct reclaim_state *reclaim_state;
1502 struct backing_dev_info *backing_dev_info;
1504 struct io_context *io_context;
1506 unsigned long ptrace_message;
1507 siginfo_t *last_siginfo; /* For ptrace use. */
1508 struct task_io_accounting ioac;
1509 #if defined(CONFIG_TASK_XACCT)
1510 u64 acct_rss_mem1; /* accumulated rss usage */
1511 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1512 cputime_t acct_timexpd; /* stime + utime since last update */
1514 #ifdef CONFIG_CPUSETS
1515 nodemask_t mems_allowed; /* Protected by alloc_lock */
1516 seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
1517 int cpuset_mem_spread_rotor;
1518 int cpuset_slab_spread_rotor;
1520 #ifdef CONFIG_CGROUPS
1521 /* Control Group info protected by css_set_lock */
1522 struct css_set __rcu *cgroups;
1523 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1524 struct list_head cg_list;
1527 struct robust_list_head __user *robust_list;
1528 #ifdef CONFIG_COMPAT
1529 struct compat_robust_list_head __user *compat_robust_list;
1531 struct list_head pi_state_list;
1532 struct futex_pi_state *pi_state_cache;
1534 #ifdef CONFIG_PERF_EVENTS
1535 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1536 struct mutex perf_event_mutex;
1537 struct list_head perf_event_list;
1540 struct mempolicy *mempolicy; /* Protected by alloc_lock */
1542 short pref_node_fork;
1544 struct rcu_head rcu;
1547 * cache last used pipe for splice
1549 struct pipe_inode_info *splice_pipe;
1550 #ifdef CONFIG_TASK_DELAY_ACCT
1551 struct task_delay_info *delays;
1553 #ifdef CONFIG_FAULT_INJECTION
1557 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1558 * balance_dirty_pages() for some dirty throttling pause
1561 int nr_dirtied_pause;
1562 unsigned long dirty_paused_when; /* start of a write-and-pause period */
1564 #ifdef CONFIG_LATENCYTOP
1565 int latency_record_count;
1566 struct latency_record latency_record[LT_SAVECOUNT];
1569 * time slack values; these are used to round up poll() and
1570 * select() etc timeout values. These are in nanoseconds.
1572 unsigned long timer_slack_ns;
1573 unsigned long default_timer_slack_ns;
1575 struct list_head *scm_work_list;
1576 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1577 /* Index of current stored address in ret_stack */
1579 /* Stack of return addresses for return function tracing */
1580 struct ftrace_ret_stack *ret_stack;
1581 /* time stamp for last schedule */
1582 unsigned long long ftrace_timestamp;
1584 * Number of functions that haven't been traced
1585 * because of depth overrun.
1587 atomic_t trace_overrun;
1588 /* Pause for the tracing */
1589 atomic_t tracing_graph_pause;
1591 #ifdef CONFIG_TRACING
1592 /* state flags for use by tracers */
1593 unsigned long trace;
1594 /* bitmask and counter of trace recursion */
1595 unsigned long trace_recursion;
1596 #endif /* CONFIG_TRACING */
1597 #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
1598 struct memcg_batch_info {
1599 int do_batch; /* incremented when batch uncharge started */
1600 struct mem_cgroup *memcg; /* target memcg of uncharge */
1601 unsigned long nr_pages; /* uncharged usage */
1602 unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
1605 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1606 atomic_t ptrace_bp_refcnt;
1610 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1611 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1614 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1615 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1616 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1617 * values are inverted: lower p->prio value means higher priority.
1619 * The MAX_USER_RT_PRIO value allows the actual maximum
1620 * RT priority to be separate from the value exported to
1621 * user-space. This allows kernel threads to set their
1622 * priority to a value higher than any user task. Note:
1623 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1626 #define MAX_USER_RT_PRIO 100
1627 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1629 #define MAX_PRIO (MAX_RT_PRIO + 40)
1630 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1632 static inline int rt_prio(int prio)
1634 if (unlikely(prio < MAX_RT_PRIO))
1639 static inline int rt_task(struct task_struct *p)
1641 return rt_prio(p->prio);
1644 static inline struct pid *task_pid(struct task_struct *task)
1646 return task->pids[PIDTYPE_PID].pid;
1649 static inline struct pid *task_tgid(struct task_struct *task)
1651 return task->group_leader->pids[PIDTYPE_PID].pid;
1655 * Without tasklist or rcu lock it is not safe to dereference
1656 * the result of task_pgrp/task_session even if task == current,
1657 * we can race with another thread doing sys_setsid/sys_setpgid.
1659 static inline struct pid *task_pgrp(struct task_struct *task)
1661 return task->group_leader->pids[PIDTYPE_PGID].pid;
1664 static inline struct pid *task_session(struct task_struct *task)
1666 return task->group_leader->pids[PIDTYPE_SID].pid;
1669 struct pid_namespace;
1672 * the helpers to get the task's different pids as they are seen
1673 * from various namespaces
1675 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1676 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1678 * task_xid_nr_ns() : id seen from the ns specified;
1680 * set_task_vxid() : assigns a virtual id to a task;
1682 * see also pid_nr() etc in include/linux/pid.h
1684 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1685 struct pid_namespace *ns);
1687 static inline pid_t task_pid_nr(struct task_struct *tsk)
1692 static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1693 struct pid_namespace *ns)
1695 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1698 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1700 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1704 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1709 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1711 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1713 return pid_vnr(task_tgid(tsk));
1717 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1718 struct pid_namespace *ns)
1720 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1723 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1725 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1729 static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1730 struct pid_namespace *ns)
1732 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1735 static inline pid_t task_session_vnr(struct task_struct *tsk)
1737 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1740 /* obsolete, do not use */
1741 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1743 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1747 * pid_alive - check that a task structure is not stale
1748 * @p: Task structure to be checked.
1750 * Test if a process is not yet dead (at most zombie state)
1751 * If pid_alive fails, then pointers within the task structure
1752 * can be stale and must not be dereferenced.
1754 static inline int pid_alive(struct task_struct *p)
1756 return p->pids[PIDTYPE_PID].pid != NULL;
1760 * is_global_init - check if a task structure is init
1761 * @tsk: Task structure to be checked.
1763 * Check if a task structure is the first user space task the kernel created.
1765 static inline int is_global_init(struct task_struct *tsk)
1767 return tsk->pid == 1;
1771 * is_container_init:
1772 * check whether in the task is init in its own pid namespace.
1774 extern int is_container_init(struct task_struct *tsk);
1776 extern struct pid *cad_pid;
1778 extern void free_task(struct task_struct *tsk);
1779 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1781 extern void __put_task_struct(struct task_struct *t);
1783 static inline void put_task_struct(struct task_struct *t)
1785 if (atomic_dec_and_test(&t->usage))
1786 __put_task_struct(t);
1789 extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1790 extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1795 #define PF_EXITING 0x00000004 /* getting shut down */
1796 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1797 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1798 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1799 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1800 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1801 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1802 #define PF_DUMPCORE 0x00000200 /* dumped core */
1803 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1804 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1805 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1806 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1807 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1808 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1809 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1810 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1811 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1812 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1813 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1814 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1815 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1816 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1817 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1818 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1819 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1820 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1821 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1824 * Only the _current_ task can read/write to tsk->flags, but other
1825 * tasks can access tsk->flags in readonly mode for example
1826 * with tsk_used_math (like during threaded core dumping).
1827 * There is however an exception to this rule during ptrace
1828 * or during fork: the ptracer task is allowed to write to the
1829 * child->flags of its traced child (same goes for fork, the parent
1830 * can write to the child->flags), because we're guaranteed the
1831 * child is not running and in turn not changing child->flags
1832 * at the same time the parent does it.
1834 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1835 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1836 #define clear_used_math() clear_stopped_child_used_math(current)
1837 #define set_used_math() set_stopped_child_used_math(current)
1838 #define conditional_stopped_child_used_math(condition, child) \
1839 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1840 #define conditional_used_math(condition) \
1841 conditional_stopped_child_used_math(condition, current)
1842 #define copy_to_stopped_child_used_math(child) \
1843 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1844 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1845 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1846 #define used_math() tsk_used_math(current)
1849 * task->jobctl flags
1851 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1853 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1854 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1855 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1856 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1857 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1858 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1859 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1861 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1862 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
1863 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
1864 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
1865 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
1866 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
1867 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
1869 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1870 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
1872 extern bool task_set_jobctl_pending(struct task_struct *task,
1874 extern void task_clear_jobctl_trapping(struct task_struct *task);
1875 extern void task_clear_jobctl_pending(struct task_struct *task,
1878 #ifdef CONFIG_PREEMPT_RCU
1880 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1881 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1883 static inline void rcu_copy_process(struct task_struct *p)
1885 p->rcu_read_lock_nesting = 0;
1886 p->rcu_read_unlock_special = 0;
1887 #ifdef CONFIG_TREE_PREEMPT_RCU
1888 p->rcu_blocked_node = NULL;
1889 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1890 #ifdef CONFIG_RCU_BOOST
1891 p->rcu_boost_mutex = NULL;
1892 #endif /* #ifdef CONFIG_RCU_BOOST */
1893 INIT_LIST_HEAD(&p->rcu_node_entry);
1898 static inline void rcu_copy_process(struct task_struct *p)
1905 extern void do_set_cpus_allowed(struct task_struct *p,
1906 const struct cpumask *new_mask);
1908 extern int set_cpus_allowed_ptr(struct task_struct *p,
1909 const struct cpumask *new_mask);
1911 static inline void do_set_cpus_allowed(struct task_struct *p,
1912 const struct cpumask *new_mask)
1915 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1916 const struct cpumask *new_mask)
1918 if (!cpumask_test_cpu(0, new_mask))
1924 #ifndef CONFIG_CPUMASK_OFFSTACK
1925 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1927 return set_cpus_allowed_ptr(p, &new_mask);
1932 * Do not use outside of architecture code which knows its limitations.
1934 * sched_clock() has no promise of monotonicity or bounded drift between
1935 * CPUs, use (which you should not) requires disabling IRQs.
1937 * Please use one of the three interfaces below.
1939 extern unsigned long long notrace sched_clock(void);
1941 * See the comment in kernel/sched_clock.c
1943 extern u64 cpu_clock(int cpu);
1944 extern u64 local_clock(void);
1945 extern u64 sched_clock_cpu(int cpu);
1948 extern void sched_clock_init(void);
1950 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1951 static inline void sched_clock_tick(void)
1955 static inline void sched_clock_idle_sleep_event(void)
1959 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1964 * Architectures can set this to 1 if they have specified
1965 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1966 * but then during bootup it turns out that sched_clock()
1967 * is reliable after all:
1969 extern int sched_clock_stable;
1971 extern void sched_clock_tick(void);
1972 extern void sched_clock_idle_sleep_event(void);
1973 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1976 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1978 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1979 * The reason for this explicit opt-in is not to have perf penalty with
1980 * slow sched_clocks.
1982 extern void enable_sched_clock_irqtime(void);
1983 extern void disable_sched_clock_irqtime(void);
1985 static inline void enable_sched_clock_irqtime(void) {}
1986 static inline void disable_sched_clock_irqtime(void) {}
1989 extern unsigned long long
1990 task_sched_runtime(struct task_struct *task);
1992 /* sched_exec is called by processes performing an exec */
1994 extern void sched_exec(void);
1996 #define sched_exec() {}
1999 extern void sched_clock_idle_sleep_event(void);
2000 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
2002 #ifdef CONFIG_HOTPLUG_CPU
2003 extern void idle_task_exit(void);
2005 static inline void idle_task_exit(void) {}
2008 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
2009 extern void wake_up_idle_cpu(int cpu);
2011 static inline void wake_up_idle_cpu(int cpu) { }
2014 extern unsigned int sysctl_sched_latency;
2015 extern unsigned int sysctl_sched_min_granularity;
2016 extern unsigned int sysctl_sched_wakeup_granularity;
2017 extern unsigned int sysctl_sched_child_runs_first;
2019 enum sched_tunable_scaling {
2020 SCHED_TUNABLESCALING_NONE,
2021 SCHED_TUNABLESCALING_LOG,
2022 SCHED_TUNABLESCALING_LINEAR,
2023 SCHED_TUNABLESCALING_END,
2025 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
2027 #ifdef CONFIG_SCHED_DEBUG
2028 extern unsigned int sysctl_sched_migration_cost;
2029 extern unsigned int sysctl_sched_nr_migrate;
2030 extern unsigned int sysctl_sched_time_avg;
2031 extern unsigned int sysctl_timer_migration;
2032 extern unsigned int sysctl_sched_shares_window;
2034 int sched_proc_update_handler(struct ctl_table *table, int write,
2035 void __user *buffer, size_t *length,
2038 #ifdef CONFIG_SCHED_DEBUG
2039 static inline unsigned int get_sysctl_timer_migration(void)
2041 return sysctl_timer_migration;
2044 static inline unsigned int get_sysctl_timer_migration(void)
2049 extern unsigned int sysctl_sched_rt_period;
2050 extern int sysctl_sched_rt_runtime;
2052 int sched_rt_handler(struct ctl_table *table, int write,
2053 void __user *buffer, size_t *lenp,
2056 #ifdef CONFIG_SCHED_AUTOGROUP
2057 extern unsigned int sysctl_sched_autogroup_enabled;
2059 extern void sched_autogroup_create_attach(struct task_struct *p);
2060 extern void sched_autogroup_detach(struct task_struct *p);
2061 extern void sched_autogroup_fork(struct signal_struct *sig);
2062 extern void sched_autogroup_exit(struct signal_struct *sig);
2063 #ifdef CONFIG_PROC_FS
2064 extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
2065 extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
2068 static inline void sched_autogroup_create_attach(struct task_struct *p) { }
2069 static inline void sched_autogroup_detach(struct task_struct *p) { }
2070 static inline void sched_autogroup_fork(struct signal_struct *sig) { }
2071 static inline void sched_autogroup_exit(struct signal_struct *sig) { }
2074 #ifdef CONFIG_CFS_BANDWIDTH
2075 extern unsigned int sysctl_sched_cfs_bandwidth_slice;
2078 #ifdef CONFIG_RT_MUTEXES
2079 extern int rt_mutex_getprio(struct task_struct *p);
2080 extern void rt_mutex_setprio(struct task_struct *p, int prio);
2081 extern void rt_mutex_adjust_pi(struct task_struct *p);
2082 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
2084 return tsk->pi_blocked_on != NULL;
2087 static inline int rt_mutex_getprio(struct task_struct *p)
2089 return p->normal_prio;
2091 # define rt_mutex_adjust_pi(p) do { } while (0)
2092 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
2098 extern bool yield_to(struct task_struct *p, bool preempt);
2099 extern void set_user_nice(struct task_struct *p, long nice);
2100 extern int task_prio(const struct task_struct *p);
2101 extern int task_nice(const struct task_struct *p);
2102 extern int can_nice(const struct task_struct *p, const int nice);
2103 extern int task_curr(const struct task_struct *p);
2104 extern int idle_cpu(int cpu);
2105 extern int sched_setscheduler(struct task_struct *, int,
2106 const struct sched_param *);
2107 extern int sched_setscheduler_nocheck(struct task_struct *, int,
2108 const struct sched_param *);
2109 extern struct task_struct *idle_task(int cpu);
2111 * is_idle_task - is the specified task an idle task?
2112 * @p: the task in question.
2114 static inline bool is_idle_task(const struct task_struct *p)
2118 extern struct task_struct *curr_task(int cpu);
2119 extern void set_curr_task(int cpu, struct task_struct *p);
2124 * The default (Linux) execution domain.
2126 extern struct exec_domain default_exec_domain;
2128 union thread_union {
2129 struct thread_info thread_info;
2130 unsigned long stack[THREAD_SIZE/sizeof(long)];
2133 #ifndef __HAVE_ARCH_KSTACK_END
2134 static inline int kstack_end(void *addr)
2136 /* Reliable end of stack detection:
2137 * Some APM bios versions misalign the stack
2139 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
2143 extern union thread_union init_thread_union;
2144 extern struct task_struct init_task;
2146 extern struct mm_struct init_mm;
2148 extern struct pid_namespace init_pid_ns;
2151 * find a task by one of its numerical ids
2153 * find_task_by_pid_ns():
2154 * finds a task by its pid in the specified namespace
2155 * find_task_by_vpid():
2156 * finds a task by its virtual pid
2158 * see also find_vpid() etc in include/linux/pid.h
2161 extern struct task_struct *find_task_by_vpid(pid_t nr);
2162 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2163 struct pid_namespace *ns);
2165 extern void __set_special_pids(struct pid *pid);
2167 /* per-UID process charging. */
2168 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
2169 static inline struct user_struct *get_uid(struct user_struct *u)
2171 atomic_inc(&u->__count);
2174 extern void free_uid(struct user_struct *);
2175 extern void release_uids(struct user_namespace *ns);
2177 #include <asm/current.h>
2179 extern void xtime_update(unsigned long ticks);
2181 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2182 extern int wake_up_process(struct task_struct *tsk);
2183 extern void wake_up_new_task(struct task_struct *tsk);
2185 extern void kick_process(struct task_struct *tsk);
2187 static inline void kick_process(struct task_struct *tsk) { }
2189 extern void sched_fork(struct task_struct *p);
2190 extern void sched_dead(struct task_struct *p);
2192 extern void proc_caches_init(void);
2193 extern void flush_signals(struct task_struct *);
2194 extern void __flush_signals(struct task_struct *);
2195 extern void ignore_signals(struct task_struct *);
2196 extern void flush_signal_handlers(struct task_struct *, int force_default);
2197 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2199 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2201 unsigned long flags;
2204 spin_lock_irqsave(&tsk->sighand->siglock, flags);
2205 ret = dequeue_signal(tsk, mask, info);
2206 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2211 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2213 extern void unblock_all_signals(void);
2214 extern void release_task(struct task_struct * p);
2215 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2216 extern int force_sigsegv(int, struct task_struct *);
2217 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2218 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2219 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2220 extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
2221 const struct cred *, u32);
2222 extern int kill_pgrp(struct pid *pid, int sig, int priv);
2223 extern int kill_pid(struct pid *pid, int sig, int priv);
2224 extern int kill_proc_info(int, struct siginfo *, pid_t);
2225 extern __must_check bool do_notify_parent(struct task_struct *, int);
2226 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2227 extern void force_sig(int, struct task_struct *);
2228 extern int send_sig(int, struct task_struct *, int);
2229 extern int zap_other_threads(struct task_struct *p);
2230 extern struct sigqueue *sigqueue_alloc(void);
2231 extern void sigqueue_free(struct sigqueue *);
2232 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
2233 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2234 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
2236 static inline int kill_cad_pid(int sig, int priv)
2238 return kill_pid(cad_pid, sig, priv);
2241 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2242 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2243 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2244 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2247 * True if we are on the alternate signal stack.
2249 static inline int on_sig_stack(unsigned long sp)
2251 #ifdef CONFIG_STACK_GROWSUP
2252 return sp >= current->sas_ss_sp &&
2253 sp - current->sas_ss_sp < current->sas_ss_size;
2255 return sp > current->sas_ss_sp &&
2256 sp - current->sas_ss_sp <= current->sas_ss_size;
2260 static inline int sas_ss_flags(unsigned long sp)
2262 return (current->sas_ss_size == 0 ? SS_DISABLE
2263 : on_sig_stack(sp) ? SS_ONSTACK : 0);
2267 * Routines for handling mm_structs
2269 extern struct mm_struct * mm_alloc(void);
2271 /* mmdrop drops the mm and the page tables */
2272 extern void __mmdrop(struct mm_struct *);
2273 static inline void mmdrop(struct mm_struct * mm)
2275 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2279 /* mmput gets rid of the mappings and all user-space */
2280 extern void mmput(struct mm_struct *);
2281 /* Grab a reference to a task's mm, if it is not already going away */
2282 extern struct mm_struct *get_task_mm(struct task_struct *task);
2284 * Grab a reference to a task's mm, if it is not already going away
2285 * and ptrace_may_access with the mode parameter passed to it
2288 extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
2289 /* Remove the current tasks stale references to the old mm_struct */
2290 extern void mm_release(struct task_struct *, struct mm_struct *);
2291 /* Allocate a new mm structure and copy contents from tsk->mm */
2292 extern struct mm_struct *dup_mm(struct task_struct *tsk);
2294 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2295 struct task_struct *, struct pt_regs *);
2296 extern void flush_thread(void);
2297 extern void exit_thread(void);
2299 extern void exit_files(struct task_struct *);
2300 extern void __cleanup_sighand(struct sighand_struct *);
2302 extern void exit_itimers(struct signal_struct *);
2303 extern void flush_itimer_signals(void);
2305 extern void do_group_exit(int);
2307 extern void daemonize(const char *, ...);
2308 extern int allow_signal(int);
2309 extern int disallow_signal(int);
2311 extern int do_execve(const char *,
2312 const char __user * const __user *,
2313 const char __user * const __user *, struct pt_regs *);
2314 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
2315 struct task_struct *fork_idle(int);
2317 extern void set_task_comm(struct task_struct *tsk, char *from);
2318 extern char *get_task_comm(char *to, struct task_struct *tsk);
2321 void scheduler_ipi(void);
2322 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2324 static inline void scheduler_ipi(void) { }
2325 static inline unsigned long wait_task_inactive(struct task_struct *p,
2332 #define next_task(p) \
2333 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2335 #define for_each_process(p) \
2336 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2338 extern bool current_is_single_threaded(void);
2341 * Careful: do_each_thread/while_each_thread is a double loop so
2342 * 'break' will not work as expected - use goto instead.
2344 #define do_each_thread(g, t) \
2345 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2347 #define while_each_thread(g, t) \
2348 while ((t = next_thread(t)) != g)
2350 static inline int get_nr_threads(struct task_struct *tsk)
2352 return tsk->signal->nr_threads;
2355 static inline bool thread_group_leader(struct task_struct *p)
2357 return p->exit_signal >= 0;
2360 /* Do to the insanities of de_thread it is possible for a process
2361 * to have the pid of the thread group leader without actually being
2362 * the thread group leader. For iteration through the pids in proc
2363 * all we care about is that we have a task with the appropriate
2364 * pid, we don't actually care if we have the right task.
2366 static inline int has_group_leader_pid(struct task_struct *p)
2368 return p->pid == p->tgid;
2372 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2374 return p1->tgid == p2->tgid;
2377 static inline struct task_struct *next_thread(const struct task_struct *p)
2379 return list_entry_rcu(p->thread_group.next,
2380 struct task_struct, thread_group);
2383 static inline int thread_group_empty(struct task_struct *p)
2385 return list_empty(&p->thread_group);
2388 #define delay_group_leader(p) \
2389 (thread_group_leader(p) && !thread_group_empty(p))
2392 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2393 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2394 * pins the final release of task.io_context. Also protects ->cpuset and
2395 * ->cgroup.subsys[]. And ->vfork_done.
2397 * Nests both inside and outside of read_lock(&tasklist_lock).
2398 * It must not be nested with write_lock_irq(&tasklist_lock),
2399 * neither inside nor outside.
2401 static inline void task_lock(struct task_struct *p)
2403 spin_lock(&p->alloc_lock);
2406 static inline void task_unlock(struct task_struct *p)
2408 spin_unlock(&p->alloc_lock);
2411 extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2412 unsigned long *flags);
2414 static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2415 unsigned long *flags)
2417 struct sighand_struct *ret;
2419 ret = __lock_task_sighand(tsk, flags);
2420 (void)__cond_lock(&tsk->sighand->siglock, ret);
2424 static inline void unlock_task_sighand(struct task_struct *tsk,
2425 unsigned long *flags)
2427 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2430 #ifdef CONFIG_CGROUPS
2431 static inline void threadgroup_change_begin(struct task_struct *tsk)
2433 down_read(&tsk->signal->group_rwsem);
2435 static inline void threadgroup_change_end(struct task_struct *tsk)
2437 up_read(&tsk->signal->group_rwsem);
2441 * threadgroup_lock - lock threadgroup
2442 * @tsk: member task of the threadgroup to lock
2444 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2445 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2446 * perform exec. This is useful for cases where the threadgroup needs to
2447 * stay stable across blockable operations.
2449 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2450 * synchronization. While held, no new task will be added to threadgroup
2451 * and no existing live task will have its PF_EXITING set.
2453 * During exec, a task goes and puts its thread group through unusual
2454 * changes. After de-threading, exclusive access is assumed to resources
2455 * which are usually shared by tasks in the same group - e.g. sighand may
2456 * be replaced with a new one. Also, the exec'ing task takes over group
2457 * leader role including its pid. Exclude these changes while locked by
2458 * grabbing cred_guard_mutex which is used to synchronize exec path.
2460 static inline void threadgroup_lock(struct task_struct *tsk)
2463 * exec uses exit for de-threading nesting group_rwsem inside
2464 * cred_guard_mutex. Grab cred_guard_mutex first.
2466 mutex_lock(&tsk->signal->cred_guard_mutex);
2467 down_write(&tsk->signal->group_rwsem);
2471 * threadgroup_unlock - unlock threadgroup
2472 * @tsk: member task of the threadgroup to unlock
2474 * Reverse threadgroup_lock().
2476 static inline void threadgroup_unlock(struct task_struct *tsk)
2478 up_write(&tsk->signal->group_rwsem);
2479 mutex_unlock(&tsk->signal->cred_guard_mutex);
2482 static inline void threadgroup_change_begin(struct task_struct *tsk) {}
2483 static inline void threadgroup_change_end(struct task_struct *tsk) {}
2484 static inline void threadgroup_lock(struct task_struct *tsk) {}
2485 static inline void threadgroup_unlock(struct task_struct *tsk) {}
2488 #ifndef __HAVE_THREAD_FUNCTIONS
2490 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2491 #define task_stack_page(task) ((task)->stack)
2493 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2495 *task_thread_info(p) = *task_thread_info(org);
2496 task_thread_info(p)->task = p;
2499 static inline unsigned long *end_of_stack(struct task_struct *p)
2501 return (unsigned long *)(task_thread_info(p) + 1);
2506 static inline int object_is_on_stack(void *obj)
2508 void *stack = task_stack_page(current);
2510 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2513 extern void thread_info_cache_init(void);
2515 #ifdef CONFIG_DEBUG_STACK_USAGE
2516 static inline unsigned long stack_not_used(struct task_struct *p)
2518 unsigned long *n = end_of_stack(p);
2520 do { /* Skip over canary */
2524 return (unsigned long)n - (unsigned long)end_of_stack(p);
2528 /* set thread flags in other task's structures
2529 * - see asm/thread_info.h for TIF_xxxx flags available
2531 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2533 set_ti_thread_flag(task_thread_info(tsk), flag);
2536 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2538 clear_ti_thread_flag(task_thread_info(tsk), flag);
2541 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2543 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2546 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2548 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2551 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2553 return test_ti_thread_flag(task_thread_info(tsk), flag);
2556 static inline void set_tsk_need_resched(struct task_struct *tsk)
2558 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2561 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2563 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2566 static inline int test_tsk_need_resched(struct task_struct *tsk)
2568 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2571 static inline int restart_syscall(void)
2573 set_tsk_thread_flag(current, TIF_SIGPENDING);
2574 return -ERESTARTNOINTR;
2577 static inline int signal_pending(struct task_struct *p)
2579 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2582 static inline int __fatal_signal_pending(struct task_struct *p)
2584 return unlikely(sigismember(&p->pending.signal, SIGKILL));
2587 static inline int fatal_signal_pending(struct task_struct *p)
2589 return signal_pending(p) && __fatal_signal_pending(p);
2592 static inline int signal_pending_state(long state, struct task_struct *p)
2594 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2596 if (!signal_pending(p))
2599 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2602 static inline int need_resched(void)
2604 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2608 * cond_resched() and cond_resched_lock(): latency reduction via
2609 * explicit rescheduling in places that are safe. The return
2610 * value indicates whether a reschedule was done in fact.
2611 * cond_resched_lock() will drop the spinlock before scheduling,
2612 * cond_resched_softirq() will enable bhs before scheduling.
2614 extern int _cond_resched(void);
2616 #define cond_resched() ({ \
2617 __might_sleep(__FILE__, __LINE__, 0); \
2621 extern int __cond_resched_lock(spinlock_t *lock);
2623 #ifdef CONFIG_PREEMPT_COUNT
2624 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2626 #define PREEMPT_LOCK_OFFSET 0
2629 #define cond_resched_lock(lock) ({ \
2630 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2631 __cond_resched_lock(lock); \
2634 extern int __cond_resched_softirq(void);
2636 #define cond_resched_softirq() ({ \
2637 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2638 __cond_resched_softirq(); \
2642 * Does a critical section need to be broken due to another
2643 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2644 * but a general need for low latency)
2646 static inline int spin_needbreak(spinlock_t *lock)
2648 #ifdef CONFIG_PREEMPT
2649 return spin_is_contended(lock);
2656 * Thread group CPU time accounting.
2658 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2659 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2661 static inline void thread_group_cputime_init(struct signal_struct *sig)
2663 raw_spin_lock_init(&sig->cputimer.lock);
2667 * Reevaluate whether the task has signals pending delivery.
2668 * Wake the task if so.
2669 * This is required every time the blocked sigset_t changes.
2670 * callers must hold sighand->siglock.
2672 extern void recalc_sigpending_and_wake(struct task_struct *t);
2673 extern void recalc_sigpending(void);
2675 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2678 * Wrappers for p->thread_info->cpu access. No-op on UP.
2682 static inline unsigned int task_cpu(const struct task_struct *p)
2684 return task_thread_info(p)->cpu;
2687 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2691 static inline unsigned int task_cpu(const struct task_struct *p)
2696 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2700 #endif /* CONFIG_SMP */
2702 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2703 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2705 extern void normalize_rt_tasks(void);
2707 #ifdef CONFIG_CGROUP_SCHED
2709 extern struct task_group root_task_group;
2711 extern struct task_group *sched_create_group(struct task_group *parent);
2712 extern void sched_destroy_group(struct task_group *tg);
2713 extern void sched_move_task(struct task_struct *tsk);
2714 #ifdef CONFIG_FAIR_GROUP_SCHED
2715 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2716 extern unsigned long sched_group_shares(struct task_group *tg);
2718 #ifdef CONFIG_RT_GROUP_SCHED
2719 extern int sched_group_set_rt_runtime(struct task_group *tg,
2720 long rt_runtime_us);
2721 extern long sched_group_rt_runtime(struct task_group *tg);
2722 extern int sched_group_set_rt_period(struct task_group *tg,
2724 extern long sched_group_rt_period(struct task_group *tg);
2725 extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2729 extern int task_can_switch_user(struct user_struct *up,
2730 struct task_struct *tsk);
2732 #ifdef CONFIG_TASK_XACCT
2733 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2735 tsk->ioac.rchar += amt;
2738 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2740 tsk->ioac.wchar += amt;
2743 static inline void inc_syscr(struct task_struct *tsk)
2748 static inline void inc_syscw(struct task_struct *tsk)
2753 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2757 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2761 static inline void inc_syscr(struct task_struct *tsk)
2765 static inline void inc_syscw(struct task_struct *tsk)
2770 #ifndef TASK_SIZE_OF
2771 #define TASK_SIZE_OF(tsk) TASK_SIZE
2774 #ifdef CONFIG_MM_OWNER
2775 extern void mm_update_next_owner(struct mm_struct *mm);
2776 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2778 static inline void mm_update_next_owner(struct mm_struct *mm)
2782 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2785 #endif /* CONFIG_MM_OWNER */
2787 static inline unsigned long task_rlimit(const struct task_struct *tsk,
2790 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2793 static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2796 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2799 static inline unsigned long rlimit(unsigned int limit)
2801 return task_rlimit(current, limit);
2804 static inline unsigned long rlimit_max(unsigned int limit)
2806 return task_rlimit_max(current, limit);
2809 #endif /* __KERNEL__ */