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 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
25 #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
26 #define CLONE_NEWIPC 0x08000000 /* New ipcs */
27 #define CLONE_NEWUSER 0x10000000 /* New user namespace */
28 #define CLONE_NEWPID 0x20000000 /* New pid namespace */
29 #define CLONE_NEWNET 0x40000000 /* New network namespace */
30 #define CLONE_IO 0x80000000 /* Clone io context */
35 #define SCHED_NORMAL 0
39 /* SCHED_ISO: reserved but not implemented yet */
41 /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
42 #define SCHED_RESET_ON_FORK 0x40000000
50 #include <asm/param.h> /* for HZ */
52 #include <linux/capability.h>
53 #include <linux/threads.h>
54 #include <linux/kernel.h>
55 #include <linux/types.h>
56 #include <linux/timex.h>
57 #include <linux/jiffies.h>
58 #include <linux/rbtree.h>
59 #include <linux/thread_info.h>
60 #include <linux/cpumask.h>
61 #include <linux/errno.h>
62 #include <linux/nodemask.h>
63 #include <linux/mm_types.h>
65 #include <asm/system.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/path.h>
74 #include <linux/compiler.h>
75 #include <linux/completion.h>
76 #include <linux/pid.h>
77 #include <linux/percpu.h>
78 #include <linux/topology.h>
79 #include <linux/proportions.h>
80 #include <linux/seccomp.h>
81 #include <linux/rcupdate.h>
82 #include <linux/rculist.h>
83 #include <linux/rtmutex.h>
85 #include <linux/time.h>
86 #include <linux/param.h>
87 #include <linux/resource.h>
88 #include <linux/timer.h>
89 #include <linux/hrtimer.h>
90 #include <linux/task_io_accounting.h>
91 #include <linux/kobject.h>
92 #include <linux/latencytop.h>
93 #include <linux/cred.h>
95 #include <asm/processor.h>
98 struct futex_pi_state;
99 struct robust_list_head;
102 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_FREEZING) == 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 extern cpumask_var_t nohz_cpu_mask;
274 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
275 extern void select_nohz_load_balancer(int stop_tick);
276 extern int get_nohz_timer_target(void);
278 static inline void select_nohz_load_balancer(int stop_tick) { }
282 * Only dump TASK_* tasks. (0 for all tasks)
284 extern void show_state_filter(unsigned long state_filter);
286 static inline void show_state(void)
288 show_state_filter(0);
291 extern void show_regs(struct pt_regs *);
294 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
295 * task), SP is the stack pointer of the first frame that should be shown in the back
296 * trace (or NULL if the entire call-chain of the task should be shown).
298 extern void show_stack(struct task_struct *task, unsigned long *sp);
300 void io_schedule(void);
301 long io_schedule_timeout(long timeout);
303 extern void cpu_init (void);
304 extern void trap_init(void);
305 extern void update_process_times(int user);
306 extern void scheduler_tick(void);
308 extern void sched_show_task(struct task_struct *p);
310 #ifdef CONFIG_LOCKUP_DETECTOR
311 extern void touch_softlockup_watchdog(void);
312 extern void touch_softlockup_watchdog_sync(void);
313 extern void touch_all_softlockup_watchdogs(void);
314 extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
316 size_t *lenp, loff_t *ppos);
317 extern unsigned int softlockup_panic;
318 extern int softlockup_thresh;
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 int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner);
366 struct user_namespace;
369 * Default maximum number of active map areas, this limits the number of vmas
370 * per mm struct. Users can overwrite this number by sysctl but there is a
373 * When a program's coredump is generated as ELF format, a section is created
374 * per a vma. In ELF, the number of sections is represented in unsigned short.
375 * This means the number of sections should be smaller than 65535 at coredump.
376 * Because the kernel adds some informative sections to a image of program at
377 * generating coredump, we need some margin. The number of extra sections is
378 * 1-3 now and depends on arch. We use "5" as safe margin, here.
380 #define MAPCOUNT_ELF_CORE_MARGIN (5)
381 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
383 extern int sysctl_max_map_count;
385 #include <linux/aio.h>
388 extern void arch_pick_mmap_layout(struct mm_struct *mm);
390 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
391 unsigned long, unsigned long);
393 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
394 unsigned long len, unsigned long pgoff,
395 unsigned long flags);
396 extern void arch_unmap_area(struct mm_struct *, unsigned long);
397 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
399 static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
403 extern void set_dumpable(struct mm_struct *mm, int value);
404 extern int get_dumpable(struct mm_struct *mm);
408 #define MMF_DUMPABLE 0 /* core dump is permitted */
409 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
411 #define MMF_DUMPABLE_BITS 2
412 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
414 /* coredump filter bits */
415 #define MMF_DUMP_ANON_PRIVATE 2
416 #define MMF_DUMP_ANON_SHARED 3
417 #define MMF_DUMP_MAPPED_PRIVATE 4
418 #define MMF_DUMP_MAPPED_SHARED 5
419 #define MMF_DUMP_ELF_HEADERS 6
420 #define MMF_DUMP_HUGETLB_PRIVATE 7
421 #define MMF_DUMP_HUGETLB_SHARED 8
423 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
424 #define MMF_DUMP_FILTER_BITS 7
425 #define MMF_DUMP_FILTER_MASK \
426 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
427 #define MMF_DUMP_FILTER_DEFAULT \
428 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
429 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
431 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
432 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
434 # define MMF_DUMP_MASK_DEFAULT_ELF 0
436 /* leave room for more dump flags */
437 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
439 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
441 struct sighand_struct {
443 struct k_sigaction action[_NSIG];
445 wait_queue_head_t signalfd_wqh;
448 struct pacct_struct {
451 unsigned long ac_mem;
452 cputime_t ac_utime, ac_stime;
453 unsigned long ac_minflt, ac_majflt;
464 * struct task_cputime - collected CPU time counts
465 * @utime: time spent in user mode, in &cputime_t units
466 * @stime: time spent in kernel mode, in &cputime_t units
467 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
469 * This structure groups together three kinds of CPU time that are
470 * tracked for threads and thread groups. Most things considering
471 * CPU time want to group these counts together and treat all three
472 * of them in parallel.
474 struct task_cputime {
477 unsigned long long sum_exec_runtime;
479 /* Alternate field names when used to cache expirations. */
480 #define prof_exp stime
481 #define virt_exp utime
482 #define sched_exp sum_exec_runtime
484 #define INIT_CPUTIME \
485 (struct task_cputime) { \
486 .utime = cputime_zero, \
487 .stime = cputime_zero, \
488 .sum_exec_runtime = 0, \
492 * Disable preemption until the scheduler is running.
493 * Reset by start_kernel()->sched_init()->init_idle().
495 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
496 * before the scheduler is active -- see should_resched().
498 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
501 * struct thread_group_cputimer - thread group interval timer counts
502 * @cputime: thread group interval timers.
503 * @running: non-zero when there are timers running and
504 * @cputime receives updates.
505 * @lock: lock for fields in this struct.
507 * This structure contains the version of task_cputime, above, that is
508 * used for thread group CPU timer calculations.
510 struct thread_group_cputimer {
511 struct task_cputime cputime;
517 * NOTE! "signal_struct" does not have it's own
518 * locking, because a shared signal_struct always
519 * implies a shared sighand_struct, so locking
520 * sighand_struct is always a proper superset of
521 * the locking of signal_struct.
523 struct signal_struct {
528 wait_queue_head_t wait_chldexit; /* for wait4() */
530 /* current thread group signal load-balancing target: */
531 struct task_struct *curr_target;
533 /* shared signal handling: */
534 struct sigpending shared_pending;
536 /* thread group exit support */
539 * - notify group_exit_task when ->count is equal to notify_count
540 * - everyone except group_exit_task is stopped during signal delivery
541 * of fatal signals, group_exit_task processes the signal.
544 struct task_struct *group_exit_task;
546 /* thread group stop support, overloads group_exit_code too */
547 int group_stop_count;
548 unsigned int flags; /* see SIGNAL_* flags below */
550 /* POSIX.1b Interval Timers */
551 struct list_head posix_timers;
553 /* ITIMER_REAL timer for the process */
554 struct hrtimer real_timer;
555 struct pid *leader_pid;
556 ktime_t it_real_incr;
559 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
560 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
561 * values are defined to 0 and 1 respectively
563 struct cpu_itimer it[2];
566 * Thread group totals for process CPU timers.
567 * See thread_group_cputimer(), et al, for details.
569 struct thread_group_cputimer cputimer;
571 /* Earliest-expiration cache. */
572 struct task_cputime cputime_expires;
574 struct list_head cpu_timers[3];
576 struct pid *tty_old_pgrp;
578 /* boolean value for session group leader */
581 struct tty_struct *tty; /* NULL if no tty */
584 * Cumulative resource counters for dead threads in the group,
585 * and for reaped dead child processes forked by this group.
586 * Live threads maintain their own counters and add to these
587 * in __exit_signal, except for the group leader.
589 cputime_t utime, stime, cutime, cstime;
592 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
593 cputime_t prev_utime, prev_stime;
595 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
596 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
597 unsigned long inblock, oublock, cinblock, coublock;
598 unsigned long maxrss, cmaxrss;
599 struct task_io_accounting ioac;
602 * Cumulative ns of schedule CPU time fo dead threads in the
603 * group, not including a zombie group leader, (This only differs
604 * from jiffies_to_ns(utime + stime) if sched_clock uses something
605 * other than jiffies.)
607 unsigned long long sum_sched_runtime;
610 * We don't bother to synchronize most readers of this at all,
611 * because there is no reader checking a limit that actually needs
612 * to get both rlim_cur and rlim_max atomically, and either one
613 * alone is a single word that can safely be read normally.
614 * getrlimit/setrlimit use task_lock(current->group_leader) to
615 * protect this instead of the siglock, because they really
616 * have no need to disable irqs.
618 struct rlimit rlim[RLIM_NLIMITS];
620 #ifdef CONFIG_BSD_PROCESS_ACCT
621 struct pacct_struct pacct; /* per-process accounting information */
623 #ifdef CONFIG_TASKSTATS
624 struct taskstats *stats;
628 struct tty_audit_buf *tty_audit_buf;
631 int oom_adj; /* OOM kill score adjustment (bit shift) */
632 int oom_score_adj; /* OOM kill score adjustment */
634 struct mutex cred_guard_mutex; /* guard against foreign influences on
635 * credential calculations
636 * (notably. ptrace) */
639 /* Context switch must be unlocked if interrupts are to be enabled */
640 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
641 # define __ARCH_WANT_UNLOCKED_CTXSW
645 * Bits in flags field of signal_struct.
647 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
648 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
649 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
650 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
652 * Pending notifications to parent.
654 #define SIGNAL_CLD_STOPPED 0x00000010
655 #define SIGNAL_CLD_CONTINUED 0x00000020
656 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
658 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
660 /* If true, all threads except ->group_exit_task have pending SIGKILL */
661 static inline int signal_group_exit(const struct signal_struct *sig)
663 return (sig->flags & SIGNAL_GROUP_EXIT) ||
664 (sig->group_exit_task != NULL);
668 * Some day this will be a full-fledged user tracking system..
671 atomic_t __count; /* reference count */
672 atomic_t processes; /* How many processes does this user have? */
673 atomic_t files; /* How many open files does this user have? */
674 atomic_t sigpending; /* How many pending signals does this user have? */
675 #ifdef CONFIG_INOTIFY_USER
676 atomic_t inotify_watches; /* How many inotify watches does this user have? */
677 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
679 #ifdef CONFIG_FANOTIFY
680 atomic_t fanotify_listeners;
683 atomic_t epoll_watches; /* The number of file descriptors currently watched */
685 #ifdef CONFIG_POSIX_MQUEUE
686 /* protected by mq_lock */
687 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
689 unsigned long locked_shm; /* How many pages of mlocked shm ? */
692 struct key *uid_keyring; /* UID specific keyring */
693 struct key *session_keyring; /* UID's default session keyring */
696 /* Hash table maintenance information */
697 struct hlist_node uidhash_node;
699 struct user_namespace *user_ns;
701 #ifdef CONFIG_PERF_EVENTS
702 atomic_long_t locked_vm;
706 extern int uids_sysfs_init(void);
708 extern struct user_struct *find_user(uid_t);
710 extern struct user_struct root_user;
711 #define INIT_USER (&root_user)
714 struct backing_dev_info;
715 struct reclaim_state;
717 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
719 /* cumulative counters */
720 unsigned long pcount; /* # of times run on this cpu */
721 unsigned long long run_delay; /* time spent waiting on a runqueue */
724 unsigned long long last_arrival,/* when we last ran on a cpu */
725 last_queued; /* when we were last queued to run */
726 #ifdef CONFIG_SCHEDSTATS
728 unsigned int bkl_count;
731 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
733 #ifdef CONFIG_TASK_DELAY_ACCT
734 struct task_delay_info {
736 unsigned int flags; /* Private per-task flags */
738 /* For each stat XXX, add following, aligned appropriately
740 * struct timespec XXX_start, XXX_end;
744 * Atomicity of updates to XXX_delay, XXX_count protected by
745 * single lock above (split into XXX_lock if contention is an issue).
749 * XXX_count is incremented on every XXX operation, the delay
750 * associated with the operation is added to XXX_delay.
751 * XXX_delay contains the accumulated delay time in nanoseconds.
753 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
754 u64 blkio_delay; /* wait for sync block io completion */
755 u64 swapin_delay; /* wait for swapin block io completion */
756 u32 blkio_count; /* total count of the number of sync block */
757 /* io operations performed */
758 u32 swapin_count; /* total count of the number of swapin block */
759 /* io operations performed */
761 struct timespec freepages_start, freepages_end;
762 u64 freepages_delay; /* wait for memory reclaim */
763 u32 freepages_count; /* total count of memory reclaim */
765 #endif /* CONFIG_TASK_DELAY_ACCT */
767 static inline int sched_info_on(void)
769 #ifdef CONFIG_SCHEDSTATS
771 #elif defined(CONFIG_TASK_DELAY_ACCT)
772 extern int delayacct_on;
787 * sched-domains (multiprocessor balancing) declarations:
791 * Increase resolution of nice-level calculations:
793 #define SCHED_LOAD_SHIFT 10
794 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
796 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
799 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
800 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
801 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
802 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
803 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
804 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
805 #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */
806 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
807 #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */
808 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
809 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
810 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
811 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
813 enum powersavings_balance_level {
814 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */
815 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package
816 * first for long running threads
818 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle
819 * cpu package for power savings
821 MAX_POWERSAVINGS_BALANCE_LEVELS
824 extern int sched_mc_power_savings, sched_smt_power_savings;
826 static inline int sd_balance_for_mc_power(void)
828 if (sched_smt_power_savings)
829 return SD_POWERSAVINGS_BALANCE;
831 if (!sched_mc_power_savings)
832 return SD_PREFER_SIBLING;
837 static inline int sd_balance_for_package_power(void)
839 if (sched_mc_power_savings | sched_smt_power_savings)
840 return SD_POWERSAVINGS_BALANCE;
842 return SD_PREFER_SIBLING;
845 extern int __weak arch_sd_sibiling_asym_packing(void);
848 * Optimise SD flags for power savings:
849 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
850 * Keep default SD flags if sched_{smt,mc}_power_saving=0
853 static inline int sd_power_saving_flags(void)
855 if (sched_mc_power_savings | sched_smt_power_savings)
856 return SD_BALANCE_NEWIDLE;
862 struct sched_group *next; /* Must be a circular list */
865 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
868 unsigned int cpu_power, cpu_power_orig;
869 unsigned int group_weight;
872 * The CPUs this group covers.
874 * NOTE: this field is variable length. (Allocated dynamically
875 * by attaching extra space to the end of the structure,
876 * depending on how many CPUs the kernel has booted up with)
878 * It is also be embedded into static data structures at build
879 * time. (See 'struct static_sched_group' in kernel/sched.c)
881 unsigned long cpumask[0];
884 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
886 return to_cpumask(sg->cpumask);
889 enum sched_domain_level {
900 struct sched_domain_attr {
901 int relax_domain_level;
904 #define SD_ATTR_INIT (struct sched_domain_attr) { \
905 .relax_domain_level = -1, \
908 struct sched_domain {
909 /* These fields must be setup */
910 struct sched_domain *parent; /* top domain must be null terminated */
911 struct sched_domain *child; /* bottom domain must be null terminated */
912 struct sched_group *groups; /* the balancing groups of the domain */
913 unsigned long min_interval; /* Minimum balance interval ms */
914 unsigned long max_interval; /* Maximum balance interval ms */
915 unsigned int busy_factor; /* less balancing by factor if busy */
916 unsigned int imbalance_pct; /* No balance until over watermark */
917 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
918 unsigned int busy_idx;
919 unsigned int idle_idx;
920 unsigned int newidle_idx;
921 unsigned int wake_idx;
922 unsigned int forkexec_idx;
923 unsigned int smt_gain;
924 int flags; /* See SD_* */
925 enum sched_domain_level level;
927 /* Runtime fields. */
928 unsigned long last_balance; /* init to jiffies. units in jiffies */
929 unsigned int balance_interval; /* initialise to 1. units in ms. */
930 unsigned int nr_balance_failed; /* initialise to 0 */
934 #ifdef CONFIG_SCHEDSTATS
935 /* load_balance() stats */
936 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
937 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
938 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
939 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
940 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
941 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
942 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
943 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
945 /* Active load balancing */
946 unsigned int alb_count;
947 unsigned int alb_failed;
948 unsigned int alb_pushed;
950 /* SD_BALANCE_EXEC stats */
951 unsigned int sbe_count;
952 unsigned int sbe_balanced;
953 unsigned int sbe_pushed;
955 /* SD_BALANCE_FORK stats */
956 unsigned int sbf_count;
957 unsigned int sbf_balanced;
958 unsigned int sbf_pushed;
960 /* try_to_wake_up() stats */
961 unsigned int ttwu_wake_remote;
962 unsigned int ttwu_move_affine;
963 unsigned int ttwu_move_balance;
965 #ifdef CONFIG_SCHED_DEBUG
969 unsigned int span_weight;
971 * Span of all CPUs in this domain.
973 * NOTE: this field is variable length. (Allocated dynamically
974 * by attaching extra space to the end of the structure,
975 * depending on how many CPUs the kernel has booted up with)
977 * It is also be embedded into static data structures at build
978 * time. (See 'struct static_sched_domain' in kernel/sched.c)
980 unsigned long span[0];
983 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
985 return to_cpumask(sd->span);
988 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
989 struct sched_domain_attr *dattr_new);
991 /* Allocate an array of sched domains, for partition_sched_domains(). */
992 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
993 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
995 /* Test a flag in parent sched domain */
996 static inline int test_sd_parent(struct sched_domain *sd, int flag)
998 if (sd->parent && (sd->parent->flags & flag))
1004 unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
1005 unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
1007 #else /* CONFIG_SMP */
1009 struct sched_domain_attr;
1012 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1013 struct sched_domain_attr *dattr_new)
1016 #endif /* !CONFIG_SMP */
1019 struct io_context; /* See blkdev.h */
1022 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1023 extern void prefetch_stack(struct task_struct *t);
1025 static inline void prefetch_stack(struct task_struct *t) { }
1028 struct audit_context; /* See audit.c */
1030 struct pipe_inode_info;
1031 struct uts_namespace;
1034 struct sched_domain;
1039 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
1040 #define WF_FORK 0x02 /* child wakeup after fork */
1042 #define ENQUEUE_WAKEUP 1
1043 #define ENQUEUE_WAKING 2
1044 #define ENQUEUE_HEAD 4
1046 #define DEQUEUE_SLEEP 1
1048 struct sched_class {
1049 const struct sched_class *next;
1051 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
1052 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
1053 void (*yield_task) (struct rq *rq);
1055 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
1057 struct task_struct * (*pick_next_task) (struct rq *rq);
1058 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
1061 int (*select_task_rq)(struct rq *rq, struct task_struct *p,
1062 int sd_flag, int flags);
1064 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1065 void (*post_schedule) (struct rq *this_rq);
1066 void (*task_waking) (struct rq *this_rq, struct task_struct *task);
1067 void (*task_woken) (struct rq *this_rq, struct task_struct *task);
1069 void (*set_cpus_allowed)(struct task_struct *p,
1070 const struct cpumask *newmask);
1072 void (*rq_online)(struct rq *rq);
1073 void (*rq_offline)(struct rq *rq);
1076 void (*set_curr_task) (struct rq *rq);
1077 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1078 void (*task_fork) (struct task_struct *p);
1080 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
1082 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
1084 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1085 int oldprio, int running);
1087 unsigned int (*get_rr_interval) (struct rq *rq,
1088 struct task_struct *task);
1090 #ifdef CONFIG_FAIR_GROUP_SCHED
1091 void (*task_move_group) (struct task_struct *p, int on_rq);
1095 struct load_weight {
1096 unsigned long weight, inv_weight;
1099 #ifdef CONFIG_SCHEDSTATS
1100 struct sched_statistics {
1110 s64 sum_sleep_runtime;
1117 u64 nr_migrations_cold;
1118 u64 nr_failed_migrations_affine;
1119 u64 nr_failed_migrations_running;
1120 u64 nr_failed_migrations_hot;
1121 u64 nr_forced_migrations;
1124 u64 nr_wakeups_sync;
1125 u64 nr_wakeups_migrate;
1126 u64 nr_wakeups_local;
1127 u64 nr_wakeups_remote;
1128 u64 nr_wakeups_affine;
1129 u64 nr_wakeups_affine_attempts;
1130 u64 nr_wakeups_passive;
1131 u64 nr_wakeups_idle;
1135 struct sched_entity {
1136 struct load_weight load; /* for load-balancing */
1137 struct rb_node run_node;
1138 struct list_head group_node;
1142 u64 sum_exec_runtime;
1144 u64 prev_sum_exec_runtime;
1148 #ifdef CONFIG_SCHEDSTATS
1149 struct sched_statistics statistics;
1152 #ifdef CONFIG_FAIR_GROUP_SCHED
1153 struct sched_entity *parent;
1154 /* rq on which this entity is (to be) queued: */
1155 struct cfs_rq *cfs_rq;
1156 /* rq "owned" by this entity/group: */
1157 struct cfs_rq *my_q;
1161 struct sched_rt_entity {
1162 struct list_head run_list;
1163 unsigned long timeout;
1164 unsigned int time_slice;
1165 int nr_cpus_allowed;
1167 struct sched_rt_entity *back;
1168 #ifdef CONFIG_RT_GROUP_SCHED
1169 struct sched_rt_entity *parent;
1170 /* rq on which this entity is (to be) queued: */
1171 struct rt_rq *rt_rq;
1172 /* rq "owned" by this entity/group: */
1179 enum perf_event_task_context {
1180 perf_invalid_context = -1,
1181 perf_hw_context = 0,
1183 perf_nr_task_contexts,
1186 struct task_struct {
1187 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1190 unsigned int flags; /* per process flags, defined below */
1191 unsigned int ptrace;
1193 int lock_depth; /* BKL lock depth */
1196 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1201 int prio, static_prio, normal_prio;
1202 unsigned int rt_priority;
1203 const struct sched_class *sched_class;
1204 struct sched_entity se;
1205 struct sched_rt_entity rt;
1207 #ifdef CONFIG_PREEMPT_NOTIFIERS
1208 /* list of struct preempt_notifier: */
1209 struct hlist_head preempt_notifiers;
1213 * fpu_counter contains the number of consecutive context switches
1214 * that the FPU is used. If this is over a threshold, the lazy fpu
1215 * saving becomes unlazy to save the trap. This is an unsigned char
1216 * so that after 256 times the counter wraps and the behavior turns
1217 * lazy again; this to deal with bursty apps that only use FPU for
1220 unsigned char fpu_counter;
1221 #ifdef CONFIG_BLK_DEV_IO_TRACE
1222 unsigned int btrace_seq;
1225 unsigned int policy;
1226 cpumask_t cpus_allowed;
1228 #ifdef CONFIG_PREEMPT_RCU
1229 int rcu_read_lock_nesting;
1230 char rcu_read_unlock_special;
1231 struct list_head rcu_node_entry;
1232 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1233 #ifdef CONFIG_TREE_PREEMPT_RCU
1234 struct rcu_node *rcu_blocked_node;
1235 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1237 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1238 struct sched_info sched_info;
1241 struct list_head tasks;
1242 struct plist_node pushable_tasks;
1244 struct mm_struct *mm, *active_mm;
1245 #if defined(SPLIT_RSS_COUNTING)
1246 struct task_rss_stat rss_stat;
1250 int exit_code, exit_signal;
1251 int pdeath_signal; /* The signal sent when the parent dies */
1253 unsigned int personality;
1254 unsigned did_exec:1;
1255 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1257 unsigned in_iowait:1;
1260 /* Revert to default priority/policy when forking */
1261 unsigned sched_reset_on_fork:1;
1266 #ifdef CONFIG_CC_STACKPROTECTOR
1267 /* Canary value for the -fstack-protector gcc feature */
1268 unsigned long stack_canary;
1272 * pointers to (original) parent process, youngest child, younger sibling,
1273 * older sibling, respectively. (p->father can be replaced with
1274 * p->real_parent->pid)
1276 struct task_struct *real_parent; /* real parent process */
1277 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1279 * children/sibling forms the list of my natural children
1281 struct list_head children; /* list of my children */
1282 struct list_head sibling; /* linkage in my parent's children list */
1283 struct task_struct *group_leader; /* threadgroup leader */
1286 * ptraced is the list of tasks this task is using ptrace on.
1287 * This includes both natural children and PTRACE_ATTACH targets.
1288 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1290 struct list_head ptraced;
1291 struct list_head ptrace_entry;
1293 /* PID/PID hash table linkage. */
1294 struct pid_link pids[PIDTYPE_MAX];
1295 struct list_head thread_group;
1297 struct completion *vfork_done; /* for vfork() */
1298 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1299 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1301 cputime_t utime, stime, utimescaled, stimescaled;
1303 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
1304 cputime_t prev_utime, prev_stime;
1306 unsigned long nvcsw, nivcsw; /* context switch counts */
1307 struct timespec start_time; /* monotonic time */
1308 struct timespec real_start_time; /* boot based time */
1309 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1310 unsigned long min_flt, maj_flt;
1312 struct task_cputime cputime_expires;
1313 struct list_head cpu_timers[3];
1315 /* process credentials */
1316 const struct cred __rcu *real_cred; /* objective and real subjective task
1317 * credentials (COW) */
1318 const struct cred __rcu *cred; /* effective (overridable) subjective task
1319 * credentials (COW) */
1320 struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
1322 char comm[TASK_COMM_LEN]; /* executable name excluding path
1323 - access with [gs]et_task_comm (which lock
1324 it with task_lock())
1325 - initialized normally by setup_new_exec */
1326 /* file system info */
1327 int link_count, total_link_count;
1328 #ifdef CONFIG_SYSVIPC
1330 struct sysv_sem sysvsem;
1332 #ifdef CONFIG_DETECT_HUNG_TASK
1333 /* hung task detection */
1334 unsigned long last_switch_count;
1336 /* CPU-specific state of this task */
1337 struct thread_struct thread;
1338 /* filesystem information */
1339 struct fs_struct *fs;
1340 /* open file information */
1341 struct files_struct *files;
1343 struct nsproxy *nsproxy;
1344 /* signal handlers */
1345 struct signal_struct *signal;
1346 struct sighand_struct *sighand;
1348 sigset_t blocked, real_blocked;
1349 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1350 struct sigpending pending;
1352 unsigned long sas_ss_sp;
1354 int (*notifier)(void *priv);
1355 void *notifier_data;
1356 sigset_t *notifier_mask;
1357 struct audit_context *audit_context;
1358 #ifdef CONFIG_AUDITSYSCALL
1360 unsigned int sessionid;
1364 /* Thread group tracking */
1367 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1369 spinlock_t alloc_lock;
1371 #ifdef CONFIG_GENERIC_HARDIRQS
1372 /* IRQ handler threads */
1373 struct irqaction *irqaction;
1376 /* Protection of the PI data structures: */
1377 raw_spinlock_t pi_lock;
1379 #ifdef CONFIG_RT_MUTEXES
1380 /* PI waiters blocked on a rt_mutex held by this task */
1381 struct plist_head pi_waiters;
1382 /* Deadlock detection and priority inheritance handling */
1383 struct rt_mutex_waiter *pi_blocked_on;
1386 #ifdef CONFIG_DEBUG_MUTEXES
1387 /* mutex deadlock detection */
1388 struct mutex_waiter *blocked_on;
1390 #ifdef CONFIG_TRACE_IRQFLAGS
1391 unsigned int irq_events;
1392 unsigned long hardirq_enable_ip;
1393 unsigned long hardirq_disable_ip;
1394 unsigned int hardirq_enable_event;
1395 unsigned int hardirq_disable_event;
1396 int hardirqs_enabled;
1397 int hardirq_context;
1398 unsigned long softirq_disable_ip;
1399 unsigned long softirq_enable_ip;
1400 unsigned int softirq_disable_event;
1401 unsigned int softirq_enable_event;
1402 int softirqs_enabled;
1403 int softirq_context;
1405 #ifdef CONFIG_LOCKDEP
1406 # define MAX_LOCK_DEPTH 48UL
1409 unsigned int lockdep_recursion;
1410 struct held_lock held_locks[MAX_LOCK_DEPTH];
1411 gfp_t lockdep_reclaim_gfp;
1414 /* journalling filesystem info */
1417 /* stacked block device info */
1418 struct bio_list *bio_list;
1421 struct reclaim_state *reclaim_state;
1423 struct backing_dev_info *backing_dev_info;
1425 struct io_context *io_context;
1427 unsigned long ptrace_message;
1428 siginfo_t *last_siginfo; /* For ptrace use. */
1429 struct task_io_accounting ioac;
1430 #if defined(CONFIG_TASK_XACCT)
1431 u64 acct_rss_mem1; /* accumulated rss usage */
1432 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1433 cputime_t acct_timexpd; /* stime + utime since last update */
1435 #ifdef CONFIG_CPUSETS
1436 nodemask_t mems_allowed; /* Protected by alloc_lock */
1437 int mems_allowed_change_disable;
1438 int cpuset_mem_spread_rotor;
1439 int cpuset_slab_spread_rotor;
1441 #ifdef CONFIG_CGROUPS
1442 /* Control Group info protected by css_set_lock */
1443 struct css_set __rcu *cgroups;
1444 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1445 struct list_head cg_list;
1448 struct robust_list_head __user *robust_list;
1449 #ifdef CONFIG_COMPAT
1450 struct compat_robust_list_head __user *compat_robust_list;
1452 struct list_head pi_state_list;
1453 struct futex_pi_state *pi_state_cache;
1455 #ifdef CONFIG_PERF_EVENTS
1456 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1457 struct mutex perf_event_mutex;
1458 struct list_head perf_event_list;
1461 struct mempolicy *mempolicy; /* Protected by alloc_lock */
1464 atomic_t fs_excl; /* holding fs exclusive resources */
1465 struct rcu_head rcu;
1468 * cache last used pipe for splice
1470 struct pipe_inode_info *splice_pipe;
1471 #ifdef CONFIG_TASK_DELAY_ACCT
1472 struct task_delay_info *delays;
1474 #ifdef CONFIG_FAULT_INJECTION
1477 struct prop_local_single dirties;
1478 #ifdef CONFIG_LATENCYTOP
1479 int latency_record_count;
1480 struct latency_record latency_record[LT_SAVECOUNT];
1483 * time slack values; these are used to round up poll() and
1484 * select() etc timeout values. These are in nanoseconds.
1486 unsigned long timer_slack_ns;
1487 unsigned long default_timer_slack_ns;
1489 struct list_head *scm_work_list;
1490 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1491 /* Index of current stored address in ret_stack */
1493 /* Stack of return addresses for return function tracing */
1494 struct ftrace_ret_stack *ret_stack;
1495 /* time stamp for last schedule */
1496 unsigned long long ftrace_timestamp;
1498 * Number of functions that haven't been traced
1499 * because of depth overrun.
1501 atomic_t trace_overrun;
1502 /* Pause for the tracing */
1503 atomic_t tracing_graph_pause;
1505 #ifdef CONFIG_TRACING
1506 /* state flags for use by tracers */
1507 unsigned long trace;
1508 /* bitmask of trace recursion */
1509 unsigned long trace_recursion;
1510 #endif /* CONFIG_TRACING */
1511 #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
1512 struct memcg_batch_info {
1513 int do_batch; /* incremented when batch uncharge started */
1514 struct mem_cgroup *memcg; /* target memcg of uncharge */
1515 unsigned long bytes; /* uncharged usage */
1516 unsigned long memsw_bytes; /* uncharged mem+swap usage */
1521 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1522 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1525 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1526 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1527 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1528 * values are inverted: lower p->prio value means higher priority.
1530 * The MAX_USER_RT_PRIO value allows the actual maximum
1531 * RT priority to be separate from the value exported to
1532 * user-space. This allows kernel threads to set their
1533 * priority to a value higher than any user task. Note:
1534 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1537 #define MAX_USER_RT_PRIO 100
1538 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1540 #define MAX_PRIO (MAX_RT_PRIO + 40)
1541 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1543 static inline int rt_prio(int prio)
1545 if (unlikely(prio < MAX_RT_PRIO))
1550 static inline int rt_task(struct task_struct *p)
1552 return rt_prio(p->prio);
1555 static inline struct pid *task_pid(struct task_struct *task)
1557 return task->pids[PIDTYPE_PID].pid;
1560 static inline struct pid *task_tgid(struct task_struct *task)
1562 return task->group_leader->pids[PIDTYPE_PID].pid;
1566 * Without tasklist or rcu lock it is not safe to dereference
1567 * the result of task_pgrp/task_session even if task == current,
1568 * we can race with another thread doing sys_setsid/sys_setpgid.
1570 static inline struct pid *task_pgrp(struct task_struct *task)
1572 return task->group_leader->pids[PIDTYPE_PGID].pid;
1575 static inline struct pid *task_session(struct task_struct *task)
1577 return task->group_leader->pids[PIDTYPE_SID].pid;
1580 struct pid_namespace;
1583 * the helpers to get the task's different pids as they are seen
1584 * from various namespaces
1586 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1587 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1589 * task_xid_nr_ns() : id seen from the ns specified;
1591 * set_task_vxid() : assigns a virtual id to a task;
1593 * see also pid_nr() etc in include/linux/pid.h
1595 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1596 struct pid_namespace *ns);
1598 static inline pid_t task_pid_nr(struct task_struct *tsk)
1603 static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1604 struct pid_namespace *ns)
1606 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1609 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1611 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1615 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1620 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1622 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1624 return pid_vnr(task_tgid(tsk));
1628 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1629 struct pid_namespace *ns)
1631 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1634 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1636 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1640 static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1641 struct pid_namespace *ns)
1643 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1646 static inline pid_t task_session_vnr(struct task_struct *tsk)
1648 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1651 /* obsolete, do not use */
1652 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1654 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1658 * pid_alive - check that a task structure is not stale
1659 * @p: Task structure to be checked.
1661 * Test if a process is not yet dead (at most zombie state)
1662 * If pid_alive fails, then pointers within the task structure
1663 * can be stale and must not be dereferenced.
1665 static inline int pid_alive(struct task_struct *p)
1667 return p->pids[PIDTYPE_PID].pid != NULL;
1671 * is_global_init - check if a task structure is init
1672 * @tsk: Task structure to be checked.
1674 * Check if a task structure is the first user space task the kernel created.
1676 static inline int is_global_init(struct task_struct *tsk)
1678 return tsk->pid == 1;
1682 * is_container_init:
1683 * check whether in the task is init in its own pid namespace.
1685 extern int is_container_init(struct task_struct *tsk);
1687 extern struct pid *cad_pid;
1689 extern void free_task(struct task_struct *tsk);
1690 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1692 extern void __put_task_struct(struct task_struct *t);
1694 static inline void put_task_struct(struct task_struct *t)
1696 if (atomic_dec_and_test(&t->usage))
1697 __put_task_struct(t);
1700 extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1701 extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1706 #define PF_KSOFTIRQD 0x00000001 /* I am ksoftirqd */
1707 #define PF_STARTING 0x00000002 /* being created */
1708 #define PF_EXITING 0x00000004 /* getting shut down */
1709 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1710 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1711 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1712 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1713 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1714 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1715 #define PF_DUMPCORE 0x00000200 /* dumped core */
1716 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1717 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1718 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1719 #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */
1720 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1721 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1722 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1723 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1724 #define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */
1725 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1726 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1727 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1728 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1729 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1730 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1731 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1732 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1733 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1734 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1735 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1736 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1739 * Only the _current_ task can read/write to tsk->flags, but other
1740 * tasks can access tsk->flags in readonly mode for example
1741 * with tsk_used_math (like during threaded core dumping).
1742 * There is however an exception to this rule during ptrace
1743 * or during fork: the ptracer task is allowed to write to the
1744 * child->flags of its traced child (same goes for fork, the parent
1745 * can write to the child->flags), because we're guaranteed the
1746 * child is not running and in turn not changing child->flags
1747 * at the same time the parent does it.
1749 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1750 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1751 #define clear_used_math() clear_stopped_child_used_math(current)
1752 #define set_used_math() set_stopped_child_used_math(current)
1753 #define conditional_stopped_child_used_math(condition, child) \
1754 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1755 #define conditional_used_math(condition) \
1756 conditional_stopped_child_used_math(condition, current)
1757 #define copy_to_stopped_child_used_math(child) \
1758 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1759 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1760 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1761 #define used_math() tsk_used_math(current)
1763 #ifdef CONFIG_PREEMPT_RCU
1765 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1766 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1768 static inline void rcu_copy_process(struct task_struct *p)
1770 p->rcu_read_lock_nesting = 0;
1771 p->rcu_read_unlock_special = 0;
1772 #ifdef CONFIG_TREE_PREEMPT_RCU
1773 p->rcu_blocked_node = NULL;
1775 INIT_LIST_HEAD(&p->rcu_node_entry);
1780 static inline void rcu_copy_process(struct task_struct *p)
1787 extern int set_cpus_allowed_ptr(struct task_struct *p,
1788 const struct cpumask *new_mask);
1790 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1791 const struct cpumask *new_mask)
1793 if (!cpumask_test_cpu(0, new_mask))
1799 #ifndef CONFIG_CPUMASK_OFFSTACK
1800 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1802 return set_cpus_allowed_ptr(p, &new_mask);
1807 * Do not use outside of architecture code which knows its limitations.
1809 * sched_clock() has no promise of monotonicity or bounded drift between
1810 * CPUs, use (which you should not) requires disabling IRQs.
1812 * Please use one of the three interfaces below.
1814 extern unsigned long long notrace sched_clock(void);
1816 * See the comment in kernel/sched_clock.c
1818 extern u64 cpu_clock(int cpu);
1819 extern u64 local_clock(void);
1820 extern u64 sched_clock_cpu(int cpu);
1823 extern void sched_clock_init(void);
1825 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1826 static inline void sched_clock_tick(void)
1830 static inline void sched_clock_idle_sleep_event(void)
1834 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1839 * Architectures can set this to 1 if they have specified
1840 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1841 * but then during bootup it turns out that sched_clock()
1842 * is reliable after all:
1844 extern int sched_clock_stable;
1846 extern void sched_clock_tick(void);
1847 extern void sched_clock_idle_sleep_event(void);
1848 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1851 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1853 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1854 * The reason for this explicit opt-in is not to have perf penalty with
1855 * slow sched_clocks.
1857 extern void enable_sched_clock_irqtime(void);
1858 extern void disable_sched_clock_irqtime(void);
1860 static inline void enable_sched_clock_irqtime(void) {}
1861 static inline void disable_sched_clock_irqtime(void) {}
1864 extern unsigned long long
1865 task_sched_runtime(struct task_struct *task);
1866 extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1868 /* sched_exec is called by processes performing an exec */
1870 extern void sched_exec(void);
1872 #define sched_exec() {}
1875 extern void sched_clock_idle_sleep_event(void);
1876 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1878 #ifdef CONFIG_HOTPLUG_CPU
1879 extern void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p);
1880 extern void idle_task_exit(void);
1882 static inline void idle_task_exit(void) {}
1885 extern void sched_idle_next(void);
1887 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1888 extern void wake_up_idle_cpu(int cpu);
1890 static inline void wake_up_idle_cpu(int cpu) { }
1893 extern unsigned int sysctl_sched_latency;
1894 extern unsigned int sysctl_sched_min_granularity;
1895 extern unsigned int sysctl_sched_wakeup_granularity;
1896 extern unsigned int sysctl_sched_shares_ratelimit;
1897 extern unsigned int sysctl_sched_shares_thresh;
1898 extern unsigned int sysctl_sched_child_runs_first;
1900 enum sched_tunable_scaling {
1901 SCHED_TUNABLESCALING_NONE,
1902 SCHED_TUNABLESCALING_LOG,
1903 SCHED_TUNABLESCALING_LINEAR,
1904 SCHED_TUNABLESCALING_END,
1906 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
1908 #ifdef CONFIG_SCHED_DEBUG
1909 extern unsigned int sysctl_sched_migration_cost;
1910 extern unsigned int sysctl_sched_nr_migrate;
1911 extern unsigned int sysctl_sched_time_avg;
1912 extern unsigned int sysctl_timer_migration;
1914 int sched_proc_update_handler(struct ctl_table *table, int write,
1915 void __user *buffer, size_t *length,
1918 #ifdef CONFIG_SCHED_DEBUG
1919 static inline unsigned int get_sysctl_timer_migration(void)
1921 return sysctl_timer_migration;
1924 static inline unsigned int get_sysctl_timer_migration(void)
1929 extern unsigned int sysctl_sched_rt_period;
1930 extern int sysctl_sched_rt_runtime;
1932 int sched_rt_handler(struct ctl_table *table, int write,
1933 void __user *buffer, size_t *lenp,
1936 extern unsigned int sysctl_sched_compat_yield;
1938 #ifdef CONFIG_RT_MUTEXES
1939 extern int rt_mutex_getprio(struct task_struct *p);
1940 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1941 extern void rt_mutex_adjust_pi(struct task_struct *p);
1943 static inline int rt_mutex_getprio(struct task_struct *p)
1945 return p->normal_prio;
1947 # define rt_mutex_adjust_pi(p) do { } while (0)
1950 extern void set_user_nice(struct task_struct *p, long nice);
1951 extern int task_prio(const struct task_struct *p);
1952 extern int task_nice(const struct task_struct *p);
1953 extern int can_nice(const struct task_struct *p, const int nice);
1954 extern int task_curr(const struct task_struct *p);
1955 extern int idle_cpu(int cpu);
1956 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1957 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1958 struct sched_param *);
1959 extern struct task_struct *idle_task(int cpu);
1960 extern struct task_struct *curr_task(int cpu);
1961 extern void set_curr_task(int cpu, struct task_struct *p);
1966 * The default (Linux) execution domain.
1968 extern struct exec_domain default_exec_domain;
1970 union thread_union {
1971 struct thread_info thread_info;
1972 unsigned long stack[THREAD_SIZE/sizeof(long)];
1975 #ifndef __HAVE_ARCH_KSTACK_END
1976 static inline int kstack_end(void *addr)
1978 /* Reliable end of stack detection:
1979 * Some APM bios versions misalign the stack
1981 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1985 extern union thread_union init_thread_union;
1986 extern struct task_struct init_task;
1988 extern struct mm_struct init_mm;
1990 extern struct pid_namespace init_pid_ns;
1993 * find a task by one of its numerical ids
1995 * find_task_by_pid_ns():
1996 * finds a task by its pid in the specified namespace
1997 * find_task_by_vpid():
1998 * finds a task by its virtual pid
2000 * see also find_vpid() etc in include/linux/pid.h
2003 extern struct task_struct *find_task_by_vpid(pid_t nr);
2004 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2005 struct pid_namespace *ns);
2007 extern void __set_special_pids(struct pid *pid);
2009 /* per-UID process charging. */
2010 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
2011 static inline struct user_struct *get_uid(struct user_struct *u)
2013 atomic_inc(&u->__count);
2016 extern void free_uid(struct user_struct *);
2017 extern void release_uids(struct user_namespace *ns);
2019 #include <asm/current.h>
2021 extern void do_timer(unsigned long ticks);
2023 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2024 extern int wake_up_process(struct task_struct *tsk);
2025 extern void wake_up_new_task(struct task_struct *tsk,
2026 unsigned long clone_flags);
2028 extern void kick_process(struct task_struct *tsk);
2030 static inline void kick_process(struct task_struct *tsk) { }
2032 extern void sched_fork(struct task_struct *p, int clone_flags);
2033 extern void sched_dead(struct task_struct *p);
2035 extern void proc_caches_init(void);
2036 extern void flush_signals(struct task_struct *);
2037 extern void __flush_signals(struct task_struct *);
2038 extern void ignore_signals(struct task_struct *);
2039 extern void flush_signal_handlers(struct task_struct *, int force_default);
2040 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2042 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2044 unsigned long flags;
2047 spin_lock_irqsave(&tsk->sighand->siglock, flags);
2048 ret = dequeue_signal(tsk, mask, info);
2049 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2054 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2056 extern void unblock_all_signals(void);
2057 extern void release_task(struct task_struct * p);
2058 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2059 extern int force_sigsegv(int, struct task_struct *);
2060 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2061 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2062 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2063 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
2064 extern int kill_pgrp(struct pid *pid, int sig, int priv);
2065 extern int kill_pid(struct pid *pid, int sig, int priv);
2066 extern int kill_proc_info(int, struct siginfo *, pid_t);
2067 extern int do_notify_parent(struct task_struct *, int);
2068 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2069 extern void force_sig(int, struct task_struct *);
2070 extern int send_sig(int, struct task_struct *, int);
2071 extern int zap_other_threads(struct task_struct *p);
2072 extern struct sigqueue *sigqueue_alloc(void);
2073 extern void sigqueue_free(struct sigqueue *);
2074 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
2075 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2076 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
2078 static inline int kill_cad_pid(int sig, int priv)
2080 return kill_pid(cad_pid, sig, priv);
2083 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2084 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2085 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2086 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2089 * True if we are on the alternate signal stack.
2091 static inline int on_sig_stack(unsigned long sp)
2093 #ifdef CONFIG_STACK_GROWSUP
2094 return sp >= current->sas_ss_sp &&
2095 sp - current->sas_ss_sp < current->sas_ss_size;
2097 return sp > current->sas_ss_sp &&
2098 sp - current->sas_ss_sp <= current->sas_ss_size;
2102 static inline int sas_ss_flags(unsigned long sp)
2104 return (current->sas_ss_size == 0 ? SS_DISABLE
2105 : on_sig_stack(sp) ? SS_ONSTACK : 0);
2109 * Routines for handling mm_structs
2111 extern struct mm_struct * mm_alloc(void);
2113 /* mmdrop drops the mm and the page tables */
2114 extern void __mmdrop(struct mm_struct *);
2115 static inline void mmdrop(struct mm_struct * mm)
2117 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2121 /* mmput gets rid of the mappings and all user-space */
2122 extern void mmput(struct mm_struct *);
2123 /* Grab a reference to a task's mm, if it is not already going away */
2124 extern struct mm_struct *get_task_mm(struct task_struct *task);
2125 /* Remove the current tasks stale references to the old mm_struct */
2126 extern void mm_release(struct task_struct *, struct mm_struct *);
2127 /* Allocate a new mm structure and copy contents from tsk->mm */
2128 extern struct mm_struct *dup_mm(struct task_struct *tsk);
2130 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2131 struct task_struct *, struct pt_regs *);
2132 extern void flush_thread(void);
2133 extern void exit_thread(void);
2135 extern void exit_files(struct task_struct *);
2136 extern void __cleanup_sighand(struct sighand_struct *);
2138 extern void exit_itimers(struct signal_struct *);
2139 extern void flush_itimer_signals(void);
2141 extern NORET_TYPE void do_group_exit(int);
2143 extern void daemonize(const char *, ...);
2144 extern int allow_signal(int);
2145 extern int disallow_signal(int);
2147 extern int do_execve(const char *,
2148 const char __user * const __user *,
2149 const char __user * const __user *, struct pt_regs *);
2150 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
2151 struct task_struct *fork_idle(int);
2153 extern void set_task_comm(struct task_struct *tsk, char *from);
2154 extern char *get_task_comm(char *to, struct task_struct *tsk);
2157 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2159 static inline unsigned long wait_task_inactive(struct task_struct *p,
2166 #define next_task(p) \
2167 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2169 #define for_each_process(p) \
2170 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2172 extern bool current_is_single_threaded(void);
2175 * Careful: do_each_thread/while_each_thread is a double loop so
2176 * 'break' will not work as expected - use goto instead.
2178 #define do_each_thread(g, t) \
2179 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2181 #define while_each_thread(g, t) \
2182 while ((t = next_thread(t)) != g)
2184 static inline int get_nr_threads(struct task_struct *tsk)
2186 return tsk->signal->nr_threads;
2189 /* de_thread depends on thread_group_leader not being a pid based check */
2190 #define thread_group_leader(p) (p == p->group_leader)
2192 /* Do to the insanities of de_thread it is possible for a process
2193 * to have the pid of the thread group leader without actually being
2194 * the thread group leader. For iteration through the pids in proc
2195 * all we care about is that we have a task with the appropriate
2196 * pid, we don't actually care if we have the right task.
2198 static inline int has_group_leader_pid(struct task_struct *p)
2200 return p->pid == p->tgid;
2204 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2206 return p1->tgid == p2->tgid;
2209 static inline struct task_struct *next_thread(const struct task_struct *p)
2211 return list_entry_rcu(p->thread_group.next,
2212 struct task_struct, thread_group);
2215 static inline int thread_group_empty(struct task_struct *p)
2217 return list_empty(&p->thread_group);
2220 #define delay_group_leader(p) \
2221 (thread_group_leader(p) && !thread_group_empty(p))
2223 static inline int task_detached(struct task_struct *p)
2225 return p->exit_signal == -1;
2229 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2230 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2231 * pins the final release of task.io_context. Also protects ->cpuset and
2232 * ->cgroup.subsys[].
2234 * Nests both inside and outside of read_lock(&tasklist_lock).
2235 * It must not be nested with write_lock_irq(&tasklist_lock),
2236 * neither inside nor outside.
2238 static inline void task_lock(struct task_struct *p)
2240 spin_lock(&p->alloc_lock);
2243 static inline void task_unlock(struct task_struct *p)
2245 spin_unlock(&p->alloc_lock);
2248 extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2249 unsigned long *flags);
2251 #define lock_task_sighand(tsk, flags) \
2252 ({ struct sighand_struct *__ss; \
2253 __cond_lock(&(tsk)->sighand->siglock, \
2254 (__ss = __lock_task_sighand(tsk, flags))); \
2258 static inline void unlock_task_sighand(struct task_struct *tsk,
2259 unsigned long *flags)
2261 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2264 #ifndef __HAVE_THREAD_FUNCTIONS
2266 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2267 #define task_stack_page(task) ((task)->stack)
2269 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2271 *task_thread_info(p) = *task_thread_info(org);
2272 task_thread_info(p)->task = p;
2275 static inline unsigned long *end_of_stack(struct task_struct *p)
2277 return (unsigned long *)(task_thread_info(p) + 1);
2282 static inline int object_is_on_stack(void *obj)
2284 void *stack = task_stack_page(current);
2286 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2289 extern void thread_info_cache_init(void);
2291 #ifdef CONFIG_DEBUG_STACK_USAGE
2292 static inline unsigned long stack_not_used(struct task_struct *p)
2294 unsigned long *n = end_of_stack(p);
2296 do { /* Skip over canary */
2300 return (unsigned long)n - (unsigned long)end_of_stack(p);
2304 /* set thread flags in other task's structures
2305 * - see asm/thread_info.h for TIF_xxxx flags available
2307 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2309 set_ti_thread_flag(task_thread_info(tsk), flag);
2312 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2314 clear_ti_thread_flag(task_thread_info(tsk), flag);
2317 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2319 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2322 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2324 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2327 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2329 return test_ti_thread_flag(task_thread_info(tsk), flag);
2332 static inline void set_tsk_need_resched(struct task_struct *tsk)
2334 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2337 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2339 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2342 static inline int test_tsk_need_resched(struct task_struct *tsk)
2344 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2347 static inline int restart_syscall(void)
2349 set_tsk_thread_flag(current, TIF_SIGPENDING);
2350 return -ERESTARTNOINTR;
2353 static inline int signal_pending(struct task_struct *p)
2355 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2358 static inline int __fatal_signal_pending(struct task_struct *p)
2360 return unlikely(sigismember(&p->pending.signal, SIGKILL));
2363 static inline int fatal_signal_pending(struct task_struct *p)
2365 return signal_pending(p) && __fatal_signal_pending(p);
2368 static inline int signal_pending_state(long state, struct task_struct *p)
2370 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2372 if (!signal_pending(p))
2375 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2378 static inline int need_resched(void)
2380 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2384 * cond_resched() and cond_resched_lock(): latency reduction via
2385 * explicit rescheduling in places that are safe. The return
2386 * value indicates whether a reschedule was done in fact.
2387 * cond_resched_lock() will drop the spinlock before scheduling,
2388 * cond_resched_softirq() will enable bhs before scheduling.
2390 extern int _cond_resched(void);
2392 #define cond_resched() ({ \
2393 __might_sleep(__FILE__, __LINE__, 0); \
2397 extern int __cond_resched_lock(spinlock_t *lock);
2399 #ifdef CONFIG_PREEMPT
2400 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2402 #define PREEMPT_LOCK_OFFSET 0
2405 #define cond_resched_lock(lock) ({ \
2406 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2407 __cond_resched_lock(lock); \
2410 extern int __cond_resched_softirq(void);
2412 #define cond_resched_softirq() ({ \
2413 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2414 __cond_resched_softirq(); \
2418 * Does a critical section need to be broken due to another
2419 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2420 * but a general need for low latency)
2422 static inline int spin_needbreak(spinlock_t *lock)
2424 #ifdef CONFIG_PREEMPT
2425 return spin_is_contended(lock);
2432 * Thread group CPU time accounting.
2434 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2435 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2437 static inline void thread_group_cputime_init(struct signal_struct *sig)
2439 spin_lock_init(&sig->cputimer.lock);
2443 * Reevaluate whether the task has signals pending delivery.
2444 * Wake the task if so.
2445 * This is required every time the blocked sigset_t changes.
2446 * callers must hold sighand->siglock.
2448 extern void recalc_sigpending_and_wake(struct task_struct *t);
2449 extern void recalc_sigpending(void);
2451 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2454 * Wrappers for p->thread_info->cpu access. No-op on UP.
2458 static inline unsigned int task_cpu(const struct task_struct *p)
2460 return task_thread_info(p)->cpu;
2463 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2467 static inline unsigned int task_cpu(const struct task_struct *p)
2472 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2476 #endif /* CONFIG_SMP */
2478 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2479 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2481 extern void normalize_rt_tasks(void);
2483 #ifdef CONFIG_CGROUP_SCHED
2485 extern struct task_group init_task_group;
2487 extern struct task_group *sched_create_group(struct task_group *parent);
2488 extern void sched_destroy_group(struct task_group *tg);
2489 extern void sched_move_task(struct task_struct *tsk);
2490 #ifdef CONFIG_FAIR_GROUP_SCHED
2491 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2492 extern unsigned long sched_group_shares(struct task_group *tg);
2494 #ifdef CONFIG_RT_GROUP_SCHED
2495 extern int sched_group_set_rt_runtime(struct task_group *tg,
2496 long rt_runtime_us);
2497 extern long sched_group_rt_runtime(struct task_group *tg);
2498 extern int sched_group_set_rt_period(struct task_group *tg,
2500 extern long sched_group_rt_period(struct task_group *tg);
2501 extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2505 extern int task_can_switch_user(struct user_struct *up,
2506 struct task_struct *tsk);
2508 #ifdef CONFIG_TASK_XACCT
2509 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2511 tsk->ioac.rchar += amt;
2514 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2516 tsk->ioac.wchar += amt;
2519 static inline void inc_syscr(struct task_struct *tsk)
2524 static inline void inc_syscw(struct task_struct *tsk)
2529 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2533 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2537 static inline void inc_syscr(struct task_struct *tsk)
2541 static inline void inc_syscw(struct task_struct *tsk)
2546 #ifndef TASK_SIZE_OF
2547 #define TASK_SIZE_OF(tsk) TASK_SIZE
2551 * Call the function if the target task is executing on a CPU right now:
2553 extern void task_oncpu_function_call(struct task_struct *p,
2554 void (*func) (void *info), void *info);
2557 #ifdef CONFIG_MM_OWNER
2558 extern void mm_update_next_owner(struct mm_struct *mm);
2559 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2561 static inline void mm_update_next_owner(struct mm_struct *mm)
2565 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2568 #endif /* CONFIG_MM_OWNER */
2570 static inline unsigned long task_rlimit(const struct task_struct *tsk,
2573 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2576 static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2579 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2582 static inline unsigned long rlimit(unsigned int limit)
2584 return task_rlimit(current, limit);
2587 static inline unsigned long rlimit_max(unsigned int limit)
2589 return task_rlimit_max(current, limit);
2592 #endif /* __KERNEL__ */