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 nohz_balance_enter_idle(int cpu);
277 extern void set_cpu_sd_state_idle(void);
278 extern int get_nohz_timer_target(void);
280 static inline void nohz_balance_enter_idle(int cpu) { }
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) */
685 * Bits in flags field of signal_struct.
687 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
688 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
689 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
691 * Pending notifications to parent.
693 #define SIGNAL_CLD_STOPPED 0x00000010
694 #define SIGNAL_CLD_CONTINUED 0x00000020
695 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
697 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
699 /* If true, all threads except ->group_exit_task have pending SIGKILL */
700 static inline int signal_group_exit(const struct signal_struct *sig)
702 return (sig->flags & SIGNAL_GROUP_EXIT) ||
703 (sig->group_exit_task != NULL);
707 * Some day this will be a full-fledged user tracking system..
710 atomic_t __count; /* reference count */
711 atomic_t processes; /* How many processes does this user have? */
712 atomic_t files; /* How many open files does this user have? */
713 atomic_t sigpending; /* How many pending signals does this user have? */
714 #ifdef CONFIG_INOTIFY_USER
715 atomic_t inotify_watches; /* How many inotify watches does this user have? */
716 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
718 #ifdef CONFIG_FANOTIFY
719 atomic_t fanotify_listeners;
722 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
724 #ifdef CONFIG_POSIX_MQUEUE
725 /* protected by mq_lock */
726 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
728 unsigned long locked_shm; /* How many pages of mlocked shm ? */
731 struct key *uid_keyring; /* UID specific keyring */
732 struct key *session_keyring; /* UID's default session keyring */
735 /* Hash table maintenance information */
736 struct hlist_node uidhash_node;
739 #ifdef CONFIG_PERF_EVENTS
740 atomic_long_t locked_vm;
744 extern int uids_sysfs_init(void);
746 extern struct user_struct *find_user(kuid_t);
748 extern struct user_struct root_user;
749 #define INIT_USER (&root_user)
752 struct backing_dev_info;
753 struct reclaim_state;
755 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
757 /* cumulative counters */
758 unsigned long pcount; /* # of times run on this cpu */
759 unsigned long long run_delay; /* time spent waiting on a runqueue */
762 unsigned long long last_arrival,/* when we last ran on a cpu */
763 last_queued; /* when we were last queued to run */
765 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
767 #ifdef CONFIG_TASK_DELAY_ACCT
768 struct task_delay_info {
770 unsigned int flags; /* Private per-task flags */
772 /* For each stat XXX, add following, aligned appropriately
774 * struct timespec XXX_start, XXX_end;
778 * Atomicity of updates to XXX_delay, XXX_count protected by
779 * single lock above (split into XXX_lock if contention is an issue).
783 * XXX_count is incremented on every XXX operation, the delay
784 * associated with the operation is added to XXX_delay.
785 * XXX_delay contains the accumulated delay time in nanoseconds.
787 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
788 u64 blkio_delay; /* wait for sync block io completion */
789 u64 swapin_delay; /* wait for swapin block io completion */
790 u32 blkio_count; /* total count of the number of sync block */
791 /* io operations performed */
792 u32 swapin_count; /* total count of the number of swapin block */
793 /* io operations performed */
795 struct timespec freepages_start, freepages_end;
796 u64 freepages_delay; /* wait for memory reclaim */
797 u32 freepages_count; /* total count of memory reclaim */
799 #endif /* CONFIG_TASK_DELAY_ACCT */
801 static inline int sched_info_on(void)
803 #ifdef CONFIG_SCHEDSTATS
805 #elif defined(CONFIG_TASK_DELAY_ACCT)
806 extern int delayacct_on;
821 * Increase resolution of nice-level calculations for 64-bit architectures.
822 * The extra resolution improves shares distribution and load balancing of
823 * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
824 * hierarchies, especially on larger systems. This is not a user-visible change
825 * and does not change the user-interface for setting shares/weights.
827 * We increase resolution only if we have enough bits to allow this increased
828 * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
829 * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
832 #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */
833 # define SCHED_LOAD_RESOLUTION 10
834 # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION)
835 # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION)
837 # define SCHED_LOAD_RESOLUTION 0
838 # define scale_load(w) (w)
839 # define scale_load_down(w) (w)
842 #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION)
843 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
846 * Increase resolution of cpu_power calculations
848 #define SCHED_POWER_SHIFT 10
849 #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
852 * sched-domains (multiprocessor balancing) declarations:
855 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
856 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
857 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
858 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
859 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
860 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
861 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
862 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
863 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
864 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
865 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
866 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
868 extern int __weak arch_sd_sibiling_asym_packing(void);
870 struct sched_group_power {
873 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
876 unsigned int power, power_orig;
877 unsigned long next_update;
879 * Number of busy cpus in this group.
881 atomic_t nr_busy_cpus;
883 unsigned long cpumask[0]; /* iteration mask */
887 struct sched_group *next; /* Must be a circular list */
890 unsigned int group_weight;
891 struct sched_group_power *sgp;
894 * The CPUs this group covers.
896 * NOTE: this field is variable length. (Allocated dynamically
897 * by attaching extra space to the end of the structure,
898 * depending on how many CPUs the kernel has booted up with)
900 unsigned long cpumask[0];
903 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
905 return to_cpumask(sg->cpumask);
909 * cpumask masking which cpus in the group are allowed to iterate up the domain
912 static inline struct cpumask *sched_group_mask(struct sched_group *sg)
914 return to_cpumask(sg->sgp->cpumask);
918 * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
919 * @group: The group whose first cpu is to be returned.
921 static inline unsigned int group_first_cpu(struct sched_group *group)
923 return cpumask_first(sched_group_cpus(group));
926 struct sched_domain_attr {
927 int relax_domain_level;
930 #define SD_ATTR_INIT (struct sched_domain_attr) { \
931 .relax_domain_level = -1, \
934 extern int sched_domain_level_max;
936 struct sched_domain {
937 /* These fields must be setup */
938 struct sched_domain *parent; /* top domain must be null terminated */
939 struct sched_domain *child; /* bottom domain must be null terminated */
940 struct sched_group *groups; /* the balancing groups of the domain */
941 unsigned long min_interval; /* Minimum balance interval ms */
942 unsigned long max_interval; /* Maximum balance interval ms */
943 unsigned int busy_factor; /* less balancing by factor if busy */
944 unsigned int imbalance_pct; /* No balance until over watermark */
945 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
946 unsigned int busy_idx;
947 unsigned int idle_idx;
948 unsigned int newidle_idx;
949 unsigned int wake_idx;
950 unsigned int forkexec_idx;
951 unsigned int smt_gain;
952 int flags; /* See SD_* */
955 /* Runtime fields. */
956 unsigned long last_balance; /* init to jiffies. units in jiffies */
957 unsigned int balance_interval; /* initialise to 1. units in ms. */
958 unsigned int nr_balance_failed; /* initialise to 0 */
962 #ifdef CONFIG_SCHEDSTATS
963 /* load_balance() stats */
964 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
965 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
966 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
967 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
968 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
969 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
970 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
971 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
973 /* Active load balancing */
974 unsigned int alb_count;
975 unsigned int alb_failed;
976 unsigned int alb_pushed;
978 /* SD_BALANCE_EXEC stats */
979 unsigned int sbe_count;
980 unsigned int sbe_balanced;
981 unsigned int sbe_pushed;
983 /* SD_BALANCE_FORK stats */
984 unsigned int sbf_count;
985 unsigned int sbf_balanced;
986 unsigned int sbf_pushed;
988 /* try_to_wake_up() stats */
989 unsigned int ttwu_wake_remote;
990 unsigned int ttwu_move_affine;
991 unsigned int ttwu_move_balance;
993 #ifdef CONFIG_SCHED_DEBUG
997 void *private; /* used during construction */
998 struct rcu_head rcu; /* used during destruction */
1001 unsigned int span_weight;
1003 * Span of all CPUs in this domain.
1005 * NOTE: this field is variable length. (Allocated dynamically
1006 * by attaching extra space to the end of the structure,
1007 * depending on how many CPUs the kernel has booted up with)
1009 unsigned long span[0];
1012 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
1014 return to_cpumask(sd->span);
1017 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1018 struct sched_domain_attr *dattr_new);
1020 /* Allocate an array of sched domains, for partition_sched_domains(). */
1021 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
1022 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
1024 /* Test a flag in parent sched domain */
1025 static inline int test_sd_parent(struct sched_domain *sd, int flag)
1027 if (sd->parent && (sd->parent->flags & flag))
1033 unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
1034 unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
1036 bool cpus_share_cache(int this_cpu, int that_cpu);
1038 #else /* CONFIG_SMP */
1040 struct sched_domain_attr;
1043 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1044 struct sched_domain_attr *dattr_new)
1048 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
1053 #endif /* !CONFIG_SMP */
1056 struct io_context; /* See blkdev.h */
1059 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1060 extern void prefetch_stack(struct task_struct *t);
1062 static inline void prefetch_stack(struct task_struct *t) { }
1065 struct audit_context; /* See audit.c */
1067 struct pipe_inode_info;
1068 struct uts_namespace;
1071 struct sched_domain;
1076 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
1077 #define WF_FORK 0x02 /* child wakeup after fork */
1078 #define WF_MIGRATED 0x04 /* internal use, task got migrated */
1080 #define ENQUEUE_WAKEUP 1
1081 #define ENQUEUE_HEAD 2
1083 #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */
1085 #define ENQUEUE_WAKING 0
1088 #define DEQUEUE_SLEEP 1
1090 struct sched_class {
1091 const struct sched_class *next;
1093 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
1094 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
1095 void (*yield_task) (struct rq *rq);
1096 bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt);
1098 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
1100 struct task_struct * (*pick_next_task) (struct rq *rq);
1101 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
1104 int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);
1106 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1107 void (*post_schedule) (struct rq *this_rq);
1108 void (*task_waking) (struct task_struct *task);
1109 void (*task_woken) (struct rq *this_rq, struct task_struct *task);
1111 void (*set_cpus_allowed)(struct task_struct *p,
1112 const struct cpumask *newmask);
1114 void (*rq_online)(struct rq *rq);
1115 void (*rq_offline)(struct rq *rq);
1118 void (*set_curr_task) (struct rq *rq);
1119 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1120 void (*task_fork) (struct task_struct *p);
1122 void (*switched_from) (struct rq *this_rq, struct task_struct *task);
1123 void (*switched_to) (struct rq *this_rq, struct task_struct *task);
1124 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1127 unsigned int (*get_rr_interval) (struct rq *rq,
1128 struct task_struct *task);
1130 #ifdef CONFIG_FAIR_GROUP_SCHED
1131 void (*task_move_group) (struct task_struct *p, int on_rq);
1135 struct load_weight {
1136 unsigned long weight, inv_weight;
1139 #ifdef CONFIG_SCHEDSTATS
1140 struct sched_statistics {
1150 s64 sum_sleep_runtime;
1157 u64 nr_migrations_cold;
1158 u64 nr_failed_migrations_affine;
1159 u64 nr_failed_migrations_running;
1160 u64 nr_failed_migrations_hot;
1161 u64 nr_forced_migrations;
1164 u64 nr_wakeups_sync;
1165 u64 nr_wakeups_migrate;
1166 u64 nr_wakeups_local;
1167 u64 nr_wakeups_remote;
1168 u64 nr_wakeups_affine;
1169 u64 nr_wakeups_affine_attempts;
1170 u64 nr_wakeups_passive;
1171 u64 nr_wakeups_idle;
1175 struct sched_entity {
1176 struct load_weight load; /* for load-balancing */
1177 struct rb_node run_node;
1178 struct list_head group_node;
1182 u64 sum_exec_runtime;
1184 u64 prev_sum_exec_runtime;
1188 #ifdef CONFIG_SCHEDSTATS
1189 struct sched_statistics statistics;
1192 #ifdef CONFIG_FAIR_GROUP_SCHED
1193 struct sched_entity *parent;
1194 /* rq on which this entity is (to be) queued: */
1195 struct cfs_rq *cfs_rq;
1196 /* rq "owned" by this entity/group: */
1197 struct cfs_rq *my_q;
1201 struct sched_rt_entity {
1202 struct list_head run_list;
1203 unsigned long timeout;
1204 unsigned int time_slice;
1206 struct sched_rt_entity *back;
1207 #ifdef CONFIG_RT_GROUP_SCHED
1208 struct sched_rt_entity *parent;
1209 /* rq on which this entity is (to be) queued: */
1210 struct rt_rq *rt_rq;
1211 /* rq "owned" by this entity/group: */
1217 * default timeslice is 100 msecs (used only for SCHED_RR tasks).
1218 * Timeslices get refilled after they expire.
1220 #define RR_TIMESLICE (100 * HZ / 1000)
1224 enum perf_event_task_context {
1225 perf_invalid_context = -1,
1226 perf_hw_context = 0,
1228 perf_nr_task_contexts,
1231 struct task_struct {
1232 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1235 unsigned int flags; /* per process flags, defined below */
1236 unsigned int ptrace;
1239 struct llist_node wake_entry;
1244 int prio, static_prio, normal_prio;
1245 unsigned int rt_priority;
1246 const struct sched_class *sched_class;
1247 struct sched_entity se;
1248 struct sched_rt_entity rt;
1249 #ifdef CONFIG_CGROUP_SCHED
1250 struct task_group *sched_task_group;
1253 #ifdef CONFIG_PREEMPT_NOTIFIERS
1254 /* list of struct preempt_notifier: */
1255 struct hlist_head preempt_notifiers;
1259 * fpu_counter contains the number of consecutive context switches
1260 * that the FPU is used. If this is over a threshold, the lazy fpu
1261 * saving becomes unlazy to save the trap. This is an unsigned char
1262 * so that after 256 times the counter wraps and the behavior turns
1263 * lazy again; this to deal with bursty apps that only use FPU for
1266 unsigned char fpu_counter;
1267 #ifdef CONFIG_BLK_DEV_IO_TRACE
1268 unsigned int btrace_seq;
1271 unsigned int policy;
1272 int nr_cpus_allowed;
1273 cpumask_t cpus_allowed;
1275 #ifdef CONFIG_PREEMPT_RCU
1276 int rcu_read_lock_nesting;
1277 char rcu_read_unlock_special;
1278 struct list_head rcu_node_entry;
1279 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1280 #ifdef CONFIG_TREE_PREEMPT_RCU
1281 struct rcu_node *rcu_blocked_node;
1282 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1283 #ifdef CONFIG_RCU_BOOST
1284 struct rt_mutex *rcu_boost_mutex;
1285 #endif /* #ifdef CONFIG_RCU_BOOST */
1287 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1288 struct sched_info sched_info;
1291 struct list_head tasks;
1293 struct plist_node pushable_tasks;
1296 struct mm_struct *mm, *active_mm;
1297 #ifdef CONFIG_COMPAT_BRK
1298 unsigned brk_randomized:1;
1300 #if defined(SPLIT_RSS_COUNTING)
1301 struct task_rss_stat rss_stat;
1305 int exit_code, exit_signal;
1306 int pdeath_signal; /* The signal sent when the parent dies */
1307 unsigned int jobctl; /* JOBCTL_*, siglock protected */
1309 unsigned int personality;
1310 unsigned did_exec:1;
1311 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1313 unsigned in_iowait:1;
1315 /* task may not gain privileges */
1316 unsigned no_new_privs:1;
1318 /* Revert to default priority/policy when forking */
1319 unsigned sched_reset_on_fork:1;
1320 unsigned sched_contributes_to_load:1;
1325 #ifdef CONFIG_CC_STACKPROTECTOR
1326 /* Canary value for the -fstack-protector gcc feature */
1327 unsigned long stack_canary;
1330 * pointers to (original) parent process, youngest child, younger sibling,
1331 * older sibling, respectively. (p->father can be replaced with
1332 * p->real_parent->pid)
1334 struct task_struct __rcu *real_parent; /* real parent process */
1335 struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
1337 * children/sibling forms the list of my natural children
1339 struct list_head children; /* list of my children */
1340 struct list_head sibling; /* linkage in my parent's children list */
1341 struct task_struct *group_leader; /* threadgroup leader */
1344 * ptraced is the list of tasks this task is using ptrace on.
1345 * This includes both natural children and PTRACE_ATTACH targets.
1346 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1348 struct list_head ptraced;
1349 struct list_head ptrace_entry;
1351 /* PID/PID hash table linkage. */
1352 struct pid_link pids[PIDTYPE_MAX];
1353 struct list_head thread_group;
1355 struct completion *vfork_done; /* for vfork() */
1356 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1357 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1359 cputime_t utime, stime, utimescaled, stimescaled;
1361 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
1362 cputime_t prev_utime, prev_stime;
1364 unsigned long nvcsw, nivcsw; /* context switch counts */
1365 struct timespec start_time; /* monotonic time */
1366 struct timespec real_start_time; /* boot based time */
1367 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1368 unsigned long min_flt, maj_flt;
1370 struct task_cputime cputime_expires;
1371 struct list_head cpu_timers[3];
1373 /* process credentials */
1374 const struct cred __rcu *real_cred; /* objective and real subjective task
1375 * credentials (COW) */
1376 const struct cred __rcu *cred; /* effective (overridable) subjective task
1377 * credentials (COW) */
1378 char comm[TASK_COMM_LEN]; /* executable name excluding path
1379 - access with [gs]et_task_comm (which lock
1380 it with task_lock())
1381 - initialized normally by setup_new_exec */
1382 /* file system info */
1383 int link_count, total_link_count;
1384 #ifdef CONFIG_SYSVIPC
1386 struct sysv_sem sysvsem;
1388 #ifdef CONFIG_DETECT_HUNG_TASK
1389 /* hung task detection */
1390 unsigned long last_switch_count;
1392 /* CPU-specific state of this task */
1393 struct thread_struct thread;
1394 /* filesystem information */
1395 struct fs_struct *fs;
1396 /* open file information */
1397 struct files_struct *files;
1399 struct nsproxy *nsproxy;
1400 /* signal handlers */
1401 struct signal_struct *signal;
1402 struct sighand_struct *sighand;
1404 sigset_t blocked, real_blocked;
1405 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1406 struct sigpending pending;
1408 unsigned long sas_ss_sp;
1410 int (*notifier)(void *priv);
1411 void *notifier_data;
1412 sigset_t *notifier_mask;
1413 struct callback_head *task_works;
1415 struct audit_context *audit_context;
1416 #ifdef CONFIG_AUDITSYSCALL
1418 unsigned int sessionid;
1420 struct seccomp seccomp;
1422 /* Thread group tracking */
1425 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1427 spinlock_t alloc_lock;
1429 /* Protection of the PI data structures: */
1430 raw_spinlock_t pi_lock;
1432 #ifdef CONFIG_RT_MUTEXES
1433 /* PI waiters blocked on a rt_mutex held by this task */
1434 struct plist_head pi_waiters;
1435 /* Deadlock detection and priority inheritance handling */
1436 struct rt_mutex_waiter *pi_blocked_on;
1439 #ifdef CONFIG_DEBUG_MUTEXES
1440 /* mutex deadlock detection */
1441 struct mutex_waiter *blocked_on;
1443 #ifdef CONFIG_TRACE_IRQFLAGS
1444 unsigned int irq_events;
1445 unsigned long hardirq_enable_ip;
1446 unsigned long hardirq_disable_ip;
1447 unsigned int hardirq_enable_event;
1448 unsigned int hardirq_disable_event;
1449 int hardirqs_enabled;
1450 int hardirq_context;
1451 unsigned long softirq_disable_ip;
1452 unsigned long softirq_enable_ip;
1453 unsigned int softirq_disable_event;
1454 unsigned int softirq_enable_event;
1455 int softirqs_enabled;
1456 int softirq_context;
1458 #ifdef CONFIG_LOCKDEP
1459 # define MAX_LOCK_DEPTH 48UL
1462 unsigned int lockdep_recursion;
1463 struct held_lock held_locks[MAX_LOCK_DEPTH];
1464 gfp_t lockdep_reclaim_gfp;
1467 /* journalling filesystem info */
1470 /* stacked block device info */
1471 struct bio_list *bio_list;
1474 /* stack plugging */
1475 struct blk_plug *plug;
1479 struct reclaim_state *reclaim_state;
1481 struct backing_dev_info *backing_dev_info;
1483 struct io_context *io_context;
1485 unsigned long ptrace_message;
1486 siginfo_t *last_siginfo; /* For ptrace use. */
1487 struct task_io_accounting ioac;
1488 #if defined(CONFIG_TASK_XACCT)
1489 u64 acct_rss_mem1; /* accumulated rss usage */
1490 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1491 cputime_t acct_timexpd; /* stime + utime since last update */
1493 #ifdef CONFIG_CPUSETS
1494 nodemask_t mems_allowed; /* Protected by alloc_lock */
1495 seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
1496 int cpuset_mem_spread_rotor;
1497 int cpuset_slab_spread_rotor;
1499 #ifdef CONFIG_CGROUPS
1500 /* Control Group info protected by css_set_lock */
1501 struct css_set __rcu *cgroups;
1502 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1503 struct list_head cg_list;
1506 struct robust_list_head __user *robust_list;
1507 #ifdef CONFIG_COMPAT
1508 struct compat_robust_list_head __user *compat_robust_list;
1510 struct list_head pi_state_list;
1511 struct futex_pi_state *pi_state_cache;
1513 #ifdef CONFIG_PERF_EVENTS
1514 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1515 struct mutex perf_event_mutex;
1516 struct list_head perf_event_list;
1519 struct mempolicy *mempolicy; /* Protected by alloc_lock */
1521 short pref_node_fork;
1523 struct rcu_head rcu;
1526 * cache last used pipe for splice
1528 struct pipe_inode_info *splice_pipe;
1529 #ifdef CONFIG_TASK_DELAY_ACCT
1530 struct task_delay_info *delays;
1532 #ifdef CONFIG_FAULT_INJECTION
1536 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1537 * balance_dirty_pages() for some dirty throttling pause
1540 int nr_dirtied_pause;
1541 unsigned long dirty_paused_when; /* start of a write-and-pause period */
1543 #ifdef CONFIG_LATENCYTOP
1544 int latency_record_count;
1545 struct latency_record latency_record[LT_SAVECOUNT];
1548 * time slack values; these are used to round up poll() and
1549 * select() etc timeout values. These are in nanoseconds.
1551 unsigned long timer_slack_ns;
1552 unsigned long default_timer_slack_ns;
1554 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1555 /* Index of current stored address in ret_stack */
1557 /* Stack of return addresses for return function tracing */
1558 struct ftrace_ret_stack *ret_stack;
1559 /* time stamp for last schedule */
1560 unsigned long long ftrace_timestamp;
1562 * Number of functions that haven't been traced
1563 * because of depth overrun.
1565 atomic_t trace_overrun;
1566 /* Pause for the tracing */
1567 atomic_t tracing_graph_pause;
1569 #ifdef CONFIG_TRACING
1570 /* state flags for use by tracers */
1571 unsigned long trace;
1572 /* bitmask and counter of trace recursion */
1573 unsigned long trace_recursion;
1574 #endif /* CONFIG_TRACING */
1575 #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
1576 struct memcg_batch_info {
1577 int do_batch; /* incremented when batch uncharge started */
1578 struct mem_cgroup *memcg; /* target memcg of uncharge */
1579 unsigned long nr_pages; /* uncharged usage */
1580 unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
1583 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1584 atomic_t ptrace_bp_refcnt;
1586 #ifdef CONFIG_UPROBES
1587 struct uprobe_task *utask;
1591 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1592 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1595 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1596 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1597 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1598 * values are inverted: lower p->prio value means higher priority.
1600 * The MAX_USER_RT_PRIO value allows the actual maximum
1601 * RT priority to be separate from the value exported to
1602 * user-space. This allows kernel threads to set their
1603 * priority to a value higher than any user task. Note:
1604 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1607 #define MAX_USER_RT_PRIO 100
1608 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1610 #define MAX_PRIO (MAX_RT_PRIO + 40)
1611 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1613 static inline int rt_prio(int prio)
1615 if (unlikely(prio < MAX_RT_PRIO))
1620 static inline int rt_task(struct task_struct *p)
1622 return rt_prio(p->prio);
1625 static inline struct pid *task_pid(struct task_struct *task)
1627 return task->pids[PIDTYPE_PID].pid;
1630 static inline struct pid *task_tgid(struct task_struct *task)
1632 return task->group_leader->pids[PIDTYPE_PID].pid;
1636 * Without tasklist or rcu lock it is not safe to dereference
1637 * the result of task_pgrp/task_session even if task == current,
1638 * we can race with another thread doing sys_setsid/sys_setpgid.
1640 static inline struct pid *task_pgrp(struct task_struct *task)
1642 return task->group_leader->pids[PIDTYPE_PGID].pid;
1645 static inline struct pid *task_session(struct task_struct *task)
1647 return task->group_leader->pids[PIDTYPE_SID].pid;
1650 struct pid_namespace;
1653 * the helpers to get the task's different pids as they are seen
1654 * from various namespaces
1656 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1657 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1659 * task_xid_nr_ns() : id seen from the ns specified;
1661 * set_task_vxid() : assigns a virtual id to a task;
1663 * see also pid_nr() etc in include/linux/pid.h
1665 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1666 struct pid_namespace *ns);
1668 static inline pid_t task_pid_nr(struct task_struct *tsk)
1673 static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1674 struct pid_namespace *ns)
1676 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1679 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1681 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1685 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1690 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1692 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1694 return pid_vnr(task_tgid(tsk));
1698 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1699 struct pid_namespace *ns)
1701 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1704 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1706 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1710 static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1711 struct pid_namespace *ns)
1713 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1716 static inline pid_t task_session_vnr(struct task_struct *tsk)
1718 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1721 /* obsolete, do not use */
1722 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1724 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1728 * pid_alive - check that a task structure is not stale
1729 * @p: Task structure to be checked.
1731 * Test if a process is not yet dead (at most zombie state)
1732 * If pid_alive fails, then pointers within the task structure
1733 * can be stale and must not be dereferenced.
1735 static inline int pid_alive(struct task_struct *p)
1737 return p->pids[PIDTYPE_PID].pid != NULL;
1741 * is_global_init - check if a task structure is init
1742 * @tsk: Task structure to be checked.
1744 * Check if a task structure is the first user space task the kernel created.
1746 static inline int is_global_init(struct task_struct *tsk)
1748 return tsk->pid == 1;
1752 * is_container_init:
1753 * check whether in the task is init in its own pid namespace.
1755 extern int is_container_init(struct task_struct *tsk);
1757 extern struct pid *cad_pid;
1759 extern void free_task(struct task_struct *tsk);
1760 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1762 extern void __put_task_struct(struct task_struct *t);
1764 static inline void put_task_struct(struct task_struct *t)
1766 if (atomic_dec_and_test(&t->usage))
1767 __put_task_struct(t);
1770 extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1771 extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1776 #define PF_EXITING 0x00000004 /* getting shut down */
1777 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1778 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1779 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1780 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1781 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1782 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1783 #define PF_DUMPCORE 0x00000200 /* dumped core */
1784 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1785 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1786 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1787 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1788 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1789 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1790 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1791 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1792 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1793 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1794 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1795 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1796 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1797 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1798 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1799 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1800 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1801 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1802 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1805 * Only the _current_ task can read/write to tsk->flags, but other
1806 * tasks can access tsk->flags in readonly mode for example
1807 * with tsk_used_math (like during threaded core dumping).
1808 * There is however an exception to this rule during ptrace
1809 * or during fork: the ptracer task is allowed to write to the
1810 * child->flags of its traced child (same goes for fork, the parent
1811 * can write to the child->flags), because we're guaranteed the
1812 * child is not running and in turn not changing child->flags
1813 * at the same time the parent does it.
1815 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1816 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1817 #define clear_used_math() clear_stopped_child_used_math(current)
1818 #define set_used_math() set_stopped_child_used_math(current)
1819 #define conditional_stopped_child_used_math(condition, child) \
1820 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1821 #define conditional_used_math(condition) \
1822 conditional_stopped_child_used_math(condition, current)
1823 #define copy_to_stopped_child_used_math(child) \
1824 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1825 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1826 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1827 #define used_math() tsk_used_math(current)
1830 * task->jobctl flags
1832 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1834 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1835 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1836 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1837 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1838 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1839 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1840 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1842 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1843 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
1844 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
1845 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
1846 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
1847 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
1848 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
1850 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1851 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
1853 extern bool task_set_jobctl_pending(struct task_struct *task,
1855 extern void task_clear_jobctl_trapping(struct task_struct *task);
1856 extern void task_clear_jobctl_pending(struct task_struct *task,
1859 #ifdef CONFIG_PREEMPT_RCU
1861 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1862 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1864 static inline void rcu_copy_process(struct task_struct *p)
1866 p->rcu_read_lock_nesting = 0;
1867 p->rcu_read_unlock_special = 0;
1868 #ifdef CONFIG_TREE_PREEMPT_RCU
1869 p->rcu_blocked_node = NULL;
1870 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1871 #ifdef CONFIG_RCU_BOOST
1872 p->rcu_boost_mutex = NULL;
1873 #endif /* #ifdef CONFIG_RCU_BOOST */
1874 INIT_LIST_HEAD(&p->rcu_node_entry);
1879 static inline void rcu_copy_process(struct task_struct *p)
1885 static inline void rcu_switch(struct task_struct *prev,
1886 struct task_struct *next)
1888 #ifdef CONFIG_RCU_USER_QS
1889 rcu_user_hooks_switch(prev, next);
1893 static inline void tsk_restore_flags(struct task_struct *task,
1894 unsigned long orig_flags, unsigned long flags)
1896 task->flags &= ~flags;
1897 task->flags |= orig_flags & flags;
1901 extern void do_set_cpus_allowed(struct task_struct *p,
1902 const struct cpumask *new_mask);
1904 extern int set_cpus_allowed_ptr(struct task_struct *p,
1905 const struct cpumask *new_mask);
1907 static inline void do_set_cpus_allowed(struct task_struct *p,
1908 const struct cpumask *new_mask)
1911 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1912 const struct cpumask *new_mask)
1914 if (!cpumask_test_cpu(0, new_mask))
1921 void calc_load_enter_idle(void);
1922 void calc_load_exit_idle(void);
1924 static inline void calc_load_enter_idle(void) { }
1925 static inline void calc_load_exit_idle(void) { }
1926 #endif /* CONFIG_NO_HZ */
1928 #ifndef CONFIG_CPUMASK_OFFSTACK
1929 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1931 return set_cpus_allowed_ptr(p, &new_mask);
1936 * Do not use outside of architecture code which knows its limitations.
1938 * sched_clock() has no promise of monotonicity or bounded drift between
1939 * CPUs, use (which you should not) requires disabling IRQs.
1941 * Please use one of the three interfaces below.
1943 extern unsigned long long notrace sched_clock(void);
1945 * See the comment in kernel/sched/clock.c
1947 extern u64 cpu_clock(int cpu);
1948 extern u64 local_clock(void);
1949 extern u64 sched_clock_cpu(int cpu);
1952 extern void sched_clock_init(void);
1954 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1955 static inline void sched_clock_tick(void)
1959 static inline void sched_clock_idle_sleep_event(void)
1963 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1968 * Architectures can set this to 1 if they have specified
1969 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1970 * but then during bootup it turns out that sched_clock()
1971 * is reliable after all:
1973 extern int sched_clock_stable;
1975 extern void sched_clock_tick(void);
1976 extern void sched_clock_idle_sleep_event(void);
1977 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1980 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1982 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1983 * The reason for this explicit opt-in is not to have perf penalty with
1984 * slow sched_clocks.
1986 extern void enable_sched_clock_irqtime(void);
1987 extern void disable_sched_clock_irqtime(void);
1989 static inline void enable_sched_clock_irqtime(void) {}
1990 static inline void disable_sched_clock_irqtime(void) {}
1993 extern unsigned long long
1994 task_sched_runtime(struct task_struct *task);
1996 /* sched_exec is called by processes performing an exec */
1998 extern void sched_exec(void);
2000 #define sched_exec() {}
2003 extern void sched_clock_idle_sleep_event(void);
2004 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
2006 #ifdef CONFIG_HOTPLUG_CPU
2007 extern void idle_task_exit(void);
2009 static inline void idle_task_exit(void) {}
2012 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
2013 extern void wake_up_idle_cpu(int cpu);
2015 static inline void wake_up_idle_cpu(int cpu) { }
2018 extern unsigned int sysctl_sched_latency;
2019 extern unsigned int sysctl_sched_min_granularity;
2020 extern unsigned int sysctl_sched_wakeup_granularity;
2021 extern unsigned int sysctl_sched_child_runs_first;
2023 enum sched_tunable_scaling {
2024 SCHED_TUNABLESCALING_NONE,
2025 SCHED_TUNABLESCALING_LOG,
2026 SCHED_TUNABLESCALING_LINEAR,
2027 SCHED_TUNABLESCALING_END,
2029 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
2031 #ifdef CONFIG_SCHED_DEBUG
2032 extern unsigned int sysctl_sched_migration_cost;
2033 extern unsigned int sysctl_sched_nr_migrate;
2034 extern unsigned int sysctl_sched_time_avg;
2035 extern unsigned int sysctl_timer_migration;
2036 extern unsigned int sysctl_sched_shares_window;
2038 int sched_proc_update_handler(struct ctl_table *table, int write,
2039 void __user *buffer, size_t *length,
2042 #ifdef CONFIG_SCHED_DEBUG
2043 static inline unsigned int get_sysctl_timer_migration(void)
2045 return sysctl_timer_migration;
2048 static inline unsigned int get_sysctl_timer_migration(void)
2053 extern unsigned int sysctl_sched_rt_period;
2054 extern int sysctl_sched_rt_runtime;
2056 int sched_rt_handler(struct ctl_table *table, int write,
2057 void __user *buffer, size_t *lenp,
2060 #ifdef CONFIG_SCHED_AUTOGROUP
2061 extern unsigned int sysctl_sched_autogroup_enabled;
2063 extern void sched_autogroup_create_attach(struct task_struct *p);
2064 extern void sched_autogroup_detach(struct task_struct *p);
2065 extern void sched_autogroup_fork(struct signal_struct *sig);
2066 extern void sched_autogroup_exit(struct signal_struct *sig);
2067 #ifdef CONFIG_PROC_FS
2068 extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
2069 extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
2072 static inline void sched_autogroup_create_attach(struct task_struct *p) { }
2073 static inline void sched_autogroup_detach(struct task_struct *p) { }
2074 static inline void sched_autogroup_fork(struct signal_struct *sig) { }
2075 static inline void sched_autogroup_exit(struct signal_struct *sig) { }
2078 #ifdef CONFIG_CFS_BANDWIDTH
2079 extern unsigned int sysctl_sched_cfs_bandwidth_slice;
2082 #ifdef CONFIG_RT_MUTEXES
2083 extern int rt_mutex_getprio(struct task_struct *p);
2084 extern void rt_mutex_setprio(struct task_struct *p, int prio);
2085 extern void rt_mutex_adjust_pi(struct task_struct *p);
2086 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
2088 return tsk->pi_blocked_on != NULL;
2091 static inline int rt_mutex_getprio(struct task_struct *p)
2093 return p->normal_prio;
2095 # define rt_mutex_adjust_pi(p) do { } while (0)
2096 static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
2102 extern bool yield_to(struct task_struct *p, bool preempt);
2103 extern void set_user_nice(struct task_struct *p, long nice);
2104 extern int task_prio(const struct task_struct *p);
2105 extern int task_nice(const struct task_struct *p);
2106 extern int can_nice(const struct task_struct *p, const int nice);
2107 extern int task_curr(const struct task_struct *p);
2108 extern int idle_cpu(int cpu);
2109 extern int sched_setscheduler(struct task_struct *, int,
2110 const struct sched_param *);
2111 extern int sched_setscheduler_nocheck(struct task_struct *, int,
2112 const struct sched_param *);
2113 extern struct task_struct *idle_task(int cpu);
2115 * is_idle_task - is the specified task an idle task?
2116 * @p: the task in question.
2118 static inline bool is_idle_task(const struct task_struct *p)
2122 extern struct task_struct *curr_task(int cpu);
2123 extern void set_curr_task(int cpu, struct task_struct *p);
2128 * The default (Linux) execution domain.
2130 extern struct exec_domain default_exec_domain;
2132 union thread_union {
2133 struct thread_info thread_info;
2134 unsigned long stack[THREAD_SIZE/sizeof(long)];
2137 #ifndef __HAVE_ARCH_KSTACK_END
2138 static inline int kstack_end(void *addr)
2140 /* Reliable end of stack detection:
2141 * Some APM bios versions misalign the stack
2143 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
2147 extern union thread_union init_thread_union;
2148 extern struct task_struct init_task;
2150 extern struct mm_struct init_mm;
2152 extern struct pid_namespace init_pid_ns;
2155 * find a task by one of its numerical ids
2157 * find_task_by_pid_ns():
2158 * finds a task by its pid in the specified namespace
2159 * find_task_by_vpid():
2160 * finds a task by its virtual pid
2162 * see also find_vpid() etc in include/linux/pid.h
2165 extern struct task_struct *find_task_by_vpid(pid_t nr);
2166 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2167 struct pid_namespace *ns);
2169 extern void __set_special_pids(struct pid *pid);
2171 /* per-UID process charging. */
2172 extern struct user_struct * alloc_uid(kuid_t);
2173 static inline struct user_struct *get_uid(struct user_struct *u)
2175 atomic_inc(&u->__count);
2178 extern void free_uid(struct user_struct *);
2180 #include <asm/current.h>
2182 extern void xtime_update(unsigned long ticks);
2184 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2185 extern int wake_up_process(struct task_struct *tsk);
2186 extern void wake_up_new_task(struct task_struct *tsk);
2188 extern void kick_process(struct task_struct *tsk);
2190 static inline void kick_process(struct task_struct *tsk) { }
2192 extern void sched_fork(struct task_struct *p);
2193 extern void sched_dead(struct task_struct *p);
2195 extern void proc_caches_init(void);
2196 extern void flush_signals(struct task_struct *);
2197 extern void __flush_signals(struct task_struct *);
2198 extern void ignore_signals(struct task_struct *);
2199 extern void flush_signal_handlers(struct task_struct *, int force_default);
2200 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2202 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2204 unsigned long flags;
2207 spin_lock_irqsave(&tsk->sighand->siglock, flags);
2208 ret = dequeue_signal(tsk, mask, info);
2209 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2214 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2216 extern void unblock_all_signals(void);
2217 extern void release_task(struct task_struct * p);
2218 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2219 extern int force_sigsegv(int, struct task_struct *);
2220 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2221 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2222 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2223 extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
2224 const struct cred *, u32);
2225 extern int kill_pgrp(struct pid *pid, int sig, int priv);
2226 extern int kill_pid(struct pid *pid, int sig, int priv);
2227 extern int kill_proc_info(int, struct siginfo *, pid_t);
2228 extern __must_check bool do_notify_parent(struct task_struct *, int);
2229 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2230 extern void force_sig(int, struct task_struct *);
2231 extern int send_sig(int, struct task_struct *, int);
2232 extern int zap_other_threads(struct task_struct *p);
2233 extern struct sigqueue *sigqueue_alloc(void);
2234 extern void sigqueue_free(struct sigqueue *);
2235 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
2236 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2237 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
2239 static inline void restore_saved_sigmask(void)
2241 if (test_and_clear_restore_sigmask())
2242 __set_current_blocked(¤t->saved_sigmask);
2245 static inline sigset_t *sigmask_to_save(void)
2247 sigset_t *res = ¤t->blocked;
2248 if (unlikely(test_restore_sigmask()))
2249 res = ¤t->saved_sigmask;
2253 static inline int kill_cad_pid(int sig, int priv)
2255 return kill_pid(cad_pid, sig, priv);
2258 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2259 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2260 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2261 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2264 * True if we are on the alternate signal stack.
2266 static inline int on_sig_stack(unsigned long sp)
2268 #ifdef CONFIG_STACK_GROWSUP
2269 return sp >= current->sas_ss_sp &&
2270 sp - current->sas_ss_sp < current->sas_ss_size;
2272 return sp > current->sas_ss_sp &&
2273 sp - current->sas_ss_sp <= current->sas_ss_size;
2277 static inline int sas_ss_flags(unsigned long sp)
2279 return (current->sas_ss_size == 0 ? SS_DISABLE
2280 : on_sig_stack(sp) ? SS_ONSTACK : 0);
2284 * Routines for handling mm_structs
2286 extern struct mm_struct * mm_alloc(void);
2288 /* mmdrop drops the mm and the page tables */
2289 extern void __mmdrop(struct mm_struct *);
2290 static inline void mmdrop(struct mm_struct * mm)
2292 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2296 /* mmput gets rid of the mappings and all user-space */
2297 extern void mmput(struct mm_struct *);
2298 /* Grab a reference to a task's mm, if it is not already going away */
2299 extern struct mm_struct *get_task_mm(struct task_struct *task);
2301 * Grab a reference to a task's mm, if it is not already going away
2302 * and ptrace_may_access with the mode parameter passed to it
2305 extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
2306 /* Remove the current tasks stale references to the old mm_struct */
2307 extern void mm_release(struct task_struct *, struct mm_struct *);
2308 /* Allocate a new mm structure and copy contents from tsk->mm */
2309 extern struct mm_struct *dup_mm(struct task_struct *tsk);
2311 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2312 struct task_struct *, struct pt_regs *);
2313 extern void flush_thread(void);
2314 extern void exit_thread(void);
2316 extern void exit_files(struct task_struct *);
2317 extern void __cleanup_sighand(struct sighand_struct *);
2319 extern void exit_itimers(struct signal_struct *);
2320 extern void flush_itimer_signals(void);
2322 extern void do_group_exit(int);
2324 extern void daemonize(const char *, ...);
2325 extern int allow_signal(int);
2326 extern int disallow_signal(int);
2328 extern int do_execve(const char *,
2329 const char __user * const __user *,
2330 const char __user * const __user *, struct pt_regs *);
2331 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
2332 struct task_struct *fork_idle(int);
2334 extern void set_task_comm(struct task_struct *tsk, char *from);
2335 extern char *get_task_comm(char *to, struct task_struct *tsk);
2338 void scheduler_ipi(void);
2339 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2341 static inline void scheduler_ipi(void) { }
2342 static inline unsigned long wait_task_inactive(struct task_struct *p,
2349 #define next_task(p) \
2350 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2352 #define for_each_process(p) \
2353 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2355 extern bool current_is_single_threaded(void);
2358 * Careful: do_each_thread/while_each_thread is a double loop so
2359 * 'break' will not work as expected - use goto instead.
2361 #define do_each_thread(g, t) \
2362 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2364 #define while_each_thread(g, t) \
2365 while ((t = next_thread(t)) != g)
2367 static inline int get_nr_threads(struct task_struct *tsk)
2369 return tsk->signal->nr_threads;
2372 static inline bool thread_group_leader(struct task_struct *p)
2374 return p->exit_signal >= 0;
2377 /* Do to the insanities of de_thread it is possible for a process
2378 * to have the pid of the thread group leader without actually being
2379 * the thread group leader. For iteration through the pids in proc
2380 * all we care about is that we have a task with the appropriate
2381 * pid, we don't actually care if we have the right task.
2383 static inline int has_group_leader_pid(struct task_struct *p)
2385 return p->pid == p->tgid;
2389 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2391 return p1->tgid == p2->tgid;
2394 static inline struct task_struct *next_thread(const struct task_struct *p)
2396 return list_entry_rcu(p->thread_group.next,
2397 struct task_struct, thread_group);
2400 static inline int thread_group_empty(struct task_struct *p)
2402 return list_empty(&p->thread_group);
2405 #define delay_group_leader(p) \
2406 (thread_group_leader(p) && !thread_group_empty(p))
2409 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2410 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2411 * pins the final release of task.io_context. Also protects ->cpuset and
2412 * ->cgroup.subsys[]. And ->vfork_done.
2414 * Nests both inside and outside of read_lock(&tasklist_lock).
2415 * It must not be nested with write_lock_irq(&tasklist_lock),
2416 * neither inside nor outside.
2418 static inline void task_lock(struct task_struct *p)
2420 spin_lock(&p->alloc_lock);
2423 static inline void task_unlock(struct task_struct *p)
2425 spin_unlock(&p->alloc_lock);
2428 extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2429 unsigned long *flags);
2431 static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2432 unsigned long *flags)
2434 struct sighand_struct *ret;
2436 ret = __lock_task_sighand(tsk, flags);
2437 (void)__cond_lock(&tsk->sighand->siglock, ret);
2441 static inline void unlock_task_sighand(struct task_struct *tsk,
2442 unsigned long *flags)
2444 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2447 #ifdef CONFIG_CGROUPS
2448 static inline void threadgroup_change_begin(struct task_struct *tsk)
2450 down_read(&tsk->signal->group_rwsem);
2452 static inline void threadgroup_change_end(struct task_struct *tsk)
2454 up_read(&tsk->signal->group_rwsem);
2458 * threadgroup_lock - lock threadgroup
2459 * @tsk: member task of the threadgroup to lock
2461 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2462 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2463 * perform exec. This is useful for cases where the threadgroup needs to
2464 * stay stable across blockable operations.
2466 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2467 * synchronization. While held, no new task will be added to threadgroup
2468 * and no existing live task will have its PF_EXITING set.
2470 * During exec, a task goes and puts its thread group through unusual
2471 * changes. After de-threading, exclusive access is assumed to resources
2472 * which are usually shared by tasks in the same group - e.g. sighand may
2473 * be replaced with a new one. Also, the exec'ing task takes over group
2474 * leader role including its pid. Exclude these changes while locked by
2475 * grabbing cred_guard_mutex which is used to synchronize exec path.
2477 static inline void threadgroup_lock(struct task_struct *tsk)
2480 * exec uses exit for de-threading nesting group_rwsem inside
2481 * cred_guard_mutex. Grab cred_guard_mutex first.
2483 mutex_lock(&tsk->signal->cred_guard_mutex);
2484 down_write(&tsk->signal->group_rwsem);
2488 * threadgroup_unlock - unlock threadgroup
2489 * @tsk: member task of the threadgroup to unlock
2491 * Reverse threadgroup_lock().
2493 static inline void threadgroup_unlock(struct task_struct *tsk)
2495 up_write(&tsk->signal->group_rwsem);
2496 mutex_unlock(&tsk->signal->cred_guard_mutex);
2499 static inline void threadgroup_change_begin(struct task_struct *tsk) {}
2500 static inline void threadgroup_change_end(struct task_struct *tsk) {}
2501 static inline void threadgroup_lock(struct task_struct *tsk) {}
2502 static inline void threadgroup_unlock(struct task_struct *tsk) {}
2505 #ifndef __HAVE_THREAD_FUNCTIONS
2507 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2508 #define task_stack_page(task) ((task)->stack)
2510 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2512 *task_thread_info(p) = *task_thread_info(org);
2513 task_thread_info(p)->task = p;
2516 static inline unsigned long *end_of_stack(struct task_struct *p)
2518 return (unsigned long *)(task_thread_info(p) + 1);
2523 static inline int object_is_on_stack(void *obj)
2525 void *stack = task_stack_page(current);
2527 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2530 extern void thread_info_cache_init(void);
2532 #ifdef CONFIG_DEBUG_STACK_USAGE
2533 static inline unsigned long stack_not_used(struct task_struct *p)
2535 unsigned long *n = end_of_stack(p);
2537 do { /* Skip over canary */
2541 return (unsigned long)n - (unsigned long)end_of_stack(p);
2545 /* set thread flags in other task's structures
2546 * - see asm/thread_info.h for TIF_xxxx flags available
2548 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2550 set_ti_thread_flag(task_thread_info(tsk), flag);
2553 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2555 clear_ti_thread_flag(task_thread_info(tsk), flag);
2558 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2560 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2563 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2565 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2568 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2570 return test_ti_thread_flag(task_thread_info(tsk), flag);
2573 static inline void set_tsk_need_resched(struct task_struct *tsk)
2575 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2578 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2580 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2583 static inline int test_tsk_need_resched(struct task_struct *tsk)
2585 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2588 static inline int restart_syscall(void)
2590 set_tsk_thread_flag(current, TIF_SIGPENDING);
2591 return -ERESTARTNOINTR;
2594 static inline int signal_pending(struct task_struct *p)
2596 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2599 static inline int __fatal_signal_pending(struct task_struct *p)
2601 return unlikely(sigismember(&p->pending.signal, SIGKILL));
2604 static inline int fatal_signal_pending(struct task_struct *p)
2606 return signal_pending(p) && __fatal_signal_pending(p);
2609 static inline int signal_pending_state(long state, struct task_struct *p)
2611 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2613 if (!signal_pending(p))
2616 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2619 static inline int need_resched(void)
2621 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2625 * cond_resched() and cond_resched_lock(): latency reduction via
2626 * explicit rescheduling in places that are safe. The return
2627 * value indicates whether a reschedule was done in fact.
2628 * cond_resched_lock() will drop the spinlock before scheduling,
2629 * cond_resched_softirq() will enable bhs before scheduling.
2631 extern int _cond_resched(void);
2633 #define cond_resched() ({ \
2634 __might_sleep(__FILE__, __LINE__, 0); \
2638 extern int __cond_resched_lock(spinlock_t *lock);
2640 #ifdef CONFIG_PREEMPT_COUNT
2641 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2643 #define PREEMPT_LOCK_OFFSET 0
2646 #define cond_resched_lock(lock) ({ \
2647 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2648 __cond_resched_lock(lock); \
2651 extern int __cond_resched_softirq(void);
2653 #define cond_resched_softirq() ({ \
2654 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2655 __cond_resched_softirq(); \
2659 * Does a critical section need to be broken due to another
2660 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2661 * but a general need for low latency)
2663 static inline int spin_needbreak(spinlock_t *lock)
2665 #ifdef CONFIG_PREEMPT
2666 return spin_is_contended(lock);
2673 * Thread group CPU time accounting.
2675 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2676 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2678 static inline void thread_group_cputime_init(struct signal_struct *sig)
2680 raw_spin_lock_init(&sig->cputimer.lock);
2684 * Reevaluate whether the task has signals pending delivery.
2685 * Wake the task if so.
2686 * This is required every time the blocked sigset_t changes.
2687 * callers must hold sighand->siglock.
2689 extern void recalc_sigpending_and_wake(struct task_struct *t);
2690 extern void recalc_sigpending(void);
2692 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2695 * Wrappers for p->thread_info->cpu access. No-op on UP.
2699 static inline unsigned int task_cpu(const struct task_struct *p)
2701 return task_thread_info(p)->cpu;
2704 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2708 static inline unsigned int task_cpu(const struct task_struct *p)
2713 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2717 #endif /* CONFIG_SMP */
2719 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2720 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2722 extern void normalize_rt_tasks(void);
2724 #ifdef CONFIG_CGROUP_SCHED
2726 extern struct task_group root_task_group;
2728 extern struct task_group *sched_create_group(struct task_group *parent);
2729 extern void sched_destroy_group(struct task_group *tg);
2730 extern void sched_move_task(struct task_struct *tsk);
2731 #ifdef CONFIG_FAIR_GROUP_SCHED
2732 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2733 extern unsigned long sched_group_shares(struct task_group *tg);
2735 #ifdef CONFIG_RT_GROUP_SCHED
2736 extern int sched_group_set_rt_runtime(struct task_group *tg,
2737 long rt_runtime_us);
2738 extern long sched_group_rt_runtime(struct task_group *tg);
2739 extern int sched_group_set_rt_period(struct task_group *tg,
2741 extern long sched_group_rt_period(struct task_group *tg);
2742 extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2744 #endif /* CONFIG_CGROUP_SCHED */
2746 extern int task_can_switch_user(struct user_struct *up,
2747 struct task_struct *tsk);
2749 #ifdef CONFIG_TASK_XACCT
2750 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2752 tsk->ioac.rchar += amt;
2755 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2757 tsk->ioac.wchar += amt;
2760 static inline void inc_syscr(struct task_struct *tsk)
2765 static inline void inc_syscw(struct task_struct *tsk)
2770 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2774 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2778 static inline void inc_syscr(struct task_struct *tsk)
2782 static inline void inc_syscw(struct task_struct *tsk)
2787 #ifndef TASK_SIZE_OF
2788 #define TASK_SIZE_OF(tsk) TASK_SIZE
2791 #ifdef CONFIG_MM_OWNER
2792 extern void mm_update_next_owner(struct mm_struct *mm);
2793 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2795 static inline void mm_update_next_owner(struct mm_struct *mm)
2799 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2802 #endif /* CONFIG_MM_OWNER */
2804 static inline unsigned long task_rlimit(const struct task_struct *tsk,
2807 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2810 static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2813 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2816 static inline unsigned long rlimit(unsigned int limit)
2818 return task_rlimit(current, limit);
2821 static inline unsigned long rlimit_max(unsigned int limit)
2823 return task_rlimit_max(current, limit);
2826 #endif /* __KERNEL__ */