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 */
48 #include <asm/param.h> /* for HZ */
50 #include <linux/capability.h>
51 #include <linux/threads.h>
52 #include <linux/kernel.h>
53 #include <linux/types.h>
54 #include <linux/timex.h>
55 #include <linux/jiffies.h>
56 #include <linux/rbtree.h>
57 #include <linux/thread_info.h>
58 #include <linux/cpumask.h>
59 #include <linux/errno.h>
60 #include <linux/nodemask.h>
61 #include <linux/mm_types.h>
63 #include <asm/system.h>
65 #include <asm/ptrace.h>
66 #include <asm/cputime.h>
68 #include <linux/smp.h>
69 #include <linux/sem.h>
70 #include <linux/signal.h>
71 #include <linux/fs_struct.h>
72 #include <linux/compiler.h>
73 #include <linux/completion.h>
74 #include <linux/pid.h>
75 #include <linux/percpu.h>
76 #include <linux/topology.h>
77 #include <linux/proportions.h>
78 #include <linux/seccomp.h>
79 #include <linux/rcupdate.h>
80 #include <linux/rtmutex.h>
82 #include <linux/time.h>
83 #include <linux/param.h>
84 #include <linux/resource.h>
85 #include <linux/timer.h>
86 #include <linux/hrtimer.h>
87 #include <linux/task_io_accounting.h>
88 #include <linux/kobject.h>
89 #include <linux/latencytop.h>
90 #include <linux/cred.h>
92 #include <asm/processor.h>
96 struct futex_pi_state;
97 struct robust_list_head;
102 * List of flags we want to share for kernel threads,
103 * if only because they are not used by them anyway.
105 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
108 * These are the constant used to fake the fixed-point load-average
109 * counting. Some notes:
110 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
111 * a load-average precision of 10 bits integer + 11 bits fractional
112 * - if you want to count load-averages more often, you need more
113 * precision, or rounding will get you. With 2-second counting freq,
114 * the EXP_n values would be 1981, 2034 and 2043 if still using only
117 extern unsigned long avenrun[]; /* Load averages */
119 #define FSHIFT 11 /* nr of bits of precision */
120 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
121 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
122 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
123 #define EXP_5 2014 /* 1/exp(5sec/5min) */
124 #define EXP_15 2037 /* 1/exp(5sec/15min) */
126 #define CALC_LOAD(load,exp,n) \
128 load += n*(FIXED_1-exp); \
131 extern unsigned long total_forks;
132 extern int nr_threads;
133 DECLARE_PER_CPU(unsigned long, process_counts);
134 extern int nr_processes(void);
135 extern unsigned long nr_running(void);
136 extern unsigned long nr_uninterruptible(void);
137 extern unsigned long nr_active(void);
138 extern unsigned long nr_iowait(void);
143 #ifdef CONFIG_SCHED_DEBUG
144 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
145 extern void proc_sched_set_task(struct task_struct *p);
147 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
150 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
153 static inline void proc_sched_set_task(struct task_struct *p)
157 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
162 extern unsigned long long time_sync_thresh;
165 * Task state bitmask. NOTE! These bits are also
166 * encoded in fs/proc/array.c: get_task_state().
168 * We have two separate sets of flags: task->state
169 * is about runnability, while task->exit_state are
170 * about the task exiting. Confusing, but this way
171 * modifying one set can't modify the other one by
174 #define TASK_RUNNING 0
175 #define TASK_INTERRUPTIBLE 1
176 #define TASK_UNINTERRUPTIBLE 2
177 #define __TASK_STOPPED 4
178 #define __TASK_TRACED 8
179 /* in tsk->exit_state */
180 #define EXIT_ZOMBIE 16
182 /* in tsk->state again */
184 #define TASK_WAKEKILL 128
186 /* Convenience macros for the sake of set_task_state */
187 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
188 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
189 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
191 /* Convenience macros for the sake of wake_up */
192 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
193 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
195 /* get_task_state() */
196 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
197 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
200 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
201 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
202 #define task_is_stopped_or_traced(task) \
203 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
204 #define task_contributes_to_load(task) \
205 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
207 #define __set_task_state(tsk, state_value) \
208 do { (tsk)->state = (state_value); } while (0)
209 #define set_task_state(tsk, state_value) \
210 set_mb((tsk)->state, (state_value))
213 * set_current_state() includes a barrier so that the write of current->state
214 * is correctly serialised wrt the caller's subsequent test of whether to
217 * set_current_state(TASK_UNINTERRUPTIBLE);
218 * if (do_i_need_to_sleep())
221 * If the caller does not need such serialisation then use __set_current_state()
223 #define __set_current_state(state_value) \
224 do { current->state = (state_value); } while (0)
225 #define set_current_state(state_value) \
226 set_mb(current->state, (state_value))
228 /* Task command name length */
229 #define TASK_COMM_LEN 16
231 #include <linux/spinlock.h>
234 * This serializes "schedule()" and also protects
235 * the run-queue from deletions/modifications (but
236 * _adding_ to the beginning of the run-queue has
239 extern rwlock_t tasklist_lock;
240 extern spinlock_t mmlist_lock;
244 extern void sched_init(void);
245 extern void sched_init_smp(void);
246 extern asmlinkage void schedule_tail(struct task_struct *prev);
247 extern void init_idle(struct task_struct *idle, int cpu);
248 extern void init_idle_bootup_task(struct task_struct *idle);
250 extern int runqueue_is_locked(void);
251 extern void task_rq_unlock_wait(struct task_struct *p);
253 extern cpumask_var_t nohz_cpu_mask;
254 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
255 extern int select_nohz_load_balancer(int cpu);
257 static inline int select_nohz_load_balancer(int cpu)
264 * Only dump TASK_* tasks. (0 for all tasks)
266 extern void show_state_filter(unsigned long state_filter);
268 static inline void show_state(void)
270 show_state_filter(0);
273 extern void show_regs(struct pt_regs *);
276 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
277 * task), SP is the stack pointer of the first frame that should be shown in the back
278 * trace (or NULL if the entire call-chain of the task should be shown).
280 extern void show_stack(struct task_struct *task, unsigned long *sp);
282 void io_schedule(void);
283 long io_schedule_timeout(long timeout);
285 extern void cpu_init (void);
286 extern void trap_init(void);
287 extern void account_process_tick(struct task_struct *task, int user);
288 extern void update_process_times(int user);
289 extern void scheduler_tick(void);
291 extern void sched_show_task(struct task_struct *p);
293 #ifdef CONFIG_DETECT_SOFTLOCKUP
294 extern void softlockup_tick(void);
295 extern void touch_softlockup_watchdog(void);
296 extern void touch_all_softlockup_watchdogs(void);
297 extern unsigned int softlockup_panic;
298 extern unsigned long sysctl_hung_task_check_count;
299 extern unsigned long sysctl_hung_task_timeout_secs;
300 extern unsigned long sysctl_hung_task_warnings;
301 extern int softlockup_thresh;
303 static inline void softlockup_tick(void)
306 static inline void spawn_softlockup_task(void)
309 static inline void touch_softlockup_watchdog(void)
312 static inline void touch_all_softlockup_watchdogs(void)
318 /* Attach to any functions which should be ignored in wchan output. */
319 #define __sched __attribute__((__section__(".sched.text")))
321 /* Linker adds these: start and end of __sched functions */
322 extern char __sched_text_start[], __sched_text_end[];
324 /* Is this address in the __sched functions? */
325 extern int in_sched_functions(unsigned long addr);
327 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
328 extern signed long schedule_timeout(signed long timeout);
329 extern signed long schedule_timeout_interruptible(signed long timeout);
330 extern signed long schedule_timeout_killable(signed long timeout);
331 extern signed long schedule_timeout_uninterruptible(signed long timeout);
332 asmlinkage void schedule(void);
335 struct user_namespace;
337 /* Maximum number of active map areas.. This is a random (large) number */
338 #define DEFAULT_MAX_MAP_COUNT 65536
340 extern int sysctl_max_map_count;
342 #include <linux/aio.h>
345 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
346 unsigned long, unsigned long);
348 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
349 unsigned long len, unsigned long pgoff,
350 unsigned long flags);
351 extern void arch_unmap_area(struct mm_struct *, unsigned long);
352 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
354 #if USE_SPLIT_PTLOCKS
356 * The mm counters are not protected by its page_table_lock,
357 * so must be incremented atomically.
359 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
360 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
361 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
362 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
363 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
365 #else /* !USE_SPLIT_PTLOCKS */
367 * The mm counters are protected by its page_table_lock,
368 * so can be incremented directly.
370 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
371 #define get_mm_counter(mm, member) ((mm)->_##member)
372 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
373 #define inc_mm_counter(mm, member) (mm)->_##member++
374 #define dec_mm_counter(mm, member) (mm)->_##member--
376 #endif /* !USE_SPLIT_PTLOCKS */
378 #define get_mm_rss(mm) \
379 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
380 #define update_hiwater_rss(mm) do { \
381 unsigned long _rss = get_mm_rss(mm); \
382 if ((mm)->hiwater_rss < _rss) \
383 (mm)->hiwater_rss = _rss; \
385 #define update_hiwater_vm(mm) do { \
386 if ((mm)->hiwater_vm < (mm)->total_vm) \
387 (mm)->hiwater_vm = (mm)->total_vm; \
390 extern void set_dumpable(struct mm_struct *mm, int value);
391 extern int get_dumpable(struct mm_struct *mm);
395 #define MMF_DUMPABLE 0 /* core dump is permitted */
396 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
397 #define MMF_DUMPABLE_BITS 2
399 /* coredump filter bits */
400 #define MMF_DUMP_ANON_PRIVATE 2
401 #define MMF_DUMP_ANON_SHARED 3
402 #define MMF_DUMP_MAPPED_PRIVATE 4
403 #define MMF_DUMP_MAPPED_SHARED 5
404 #define MMF_DUMP_ELF_HEADERS 6
405 #define MMF_DUMP_HUGETLB_PRIVATE 7
406 #define MMF_DUMP_HUGETLB_SHARED 8
407 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
408 #define MMF_DUMP_FILTER_BITS 7
409 #define MMF_DUMP_FILTER_MASK \
410 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
411 #define MMF_DUMP_FILTER_DEFAULT \
412 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
413 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
415 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
416 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
418 # define MMF_DUMP_MASK_DEFAULT_ELF 0
421 struct sighand_struct {
423 struct k_sigaction action[_NSIG];
425 wait_queue_head_t signalfd_wqh;
428 struct pacct_struct {
431 unsigned long ac_mem;
432 cputime_t ac_utime, ac_stime;
433 unsigned long ac_minflt, ac_majflt;
437 * struct task_cputime - collected CPU time counts
438 * @utime: time spent in user mode, in &cputime_t units
439 * @stime: time spent in kernel mode, in &cputime_t units
440 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
442 * This structure groups together three kinds of CPU time that are
443 * tracked for threads and thread groups. Most things considering
444 * CPU time want to group these counts together and treat all three
445 * of them in parallel.
447 struct task_cputime {
450 unsigned long long sum_exec_runtime;
452 /* Alternate field names when used to cache expirations. */
453 #define prof_exp stime
454 #define virt_exp utime
455 #define sched_exp sum_exec_runtime
458 * struct thread_group_cputime - thread group interval timer counts
459 * @totals: thread group interval timers; substructure for
460 * uniprocessor kernel, per-cpu for SMP kernel.
462 * This structure contains the version of task_cputime, above, that is
463 * used for thread group CPU clock calculations.
465 struct thread_group_cputime {
466 struct task_cputime *totals;
470 * NOTE! "signal_struct" does not have it's own
471 * locking, because a shared signal_struct always
472 * implies a shared sighand_struct, so locking
473 * sighand_struct is always a proper superset of
474 * the locking of signal_struct.
476 struct signal_struct {
480 wait_queue_head_t wait_chldexit; /* for wait4() */
482 /* current thread group signal load-balancing target: */
483 struct task_struct *curr_target;
485 /* shared signal handling: */
486 struct sigpending shared_pending;
488 /* thread group exit support */
491 * - notify group_exit_task when ->count is equal to notify_count
492 * - everyone except group_exit_task is stopped during signal delivery
493 * of fatal signals, group_exit_task processes the signal.
496 struct task_struct *group_exit_task;
498 /* thread group stop support, overloads group_exit_code too */
499 int group_stop_count;
500 unsigned int flags; /* see SIGNAL_* flags below */
502 /* POSIX.1b Interval Timers */
503 struct list_head posix_timers;
505 /* ITIMER_REAL timer for the process */
506 struct hrtimer real_timer;
507 struct pid *leader_pid;
508 ktime_t it_real_incr;
510 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
511 cputime_t it_prof_expires, it_virt_expires;
512 cputime_t it_prof_incr, it_virt_incr;
515 * Thread group totals for process CPU clocks.
516 * See thread_group_cputime(), et al, for details.
518 struct thread_group_cputime cputime;
520 /* Earliest-expiration cache. */
521 struct task_cputime cputime_expires;
523 struct list_head cpu_timers[3];
525 /* job control IDs */
528 * pgrp and session fields are deprecated.
529 * use the task_session_Xnr and task_pgrp_Xnr routines below
533 pid_t pgrp __deprecated;
537 struct pid *tty_old_pgrp;
540 pid_t session __deprecated;
544 /* boolean value for session group leader */
547 struct tty_struct *tty; /* NULL if no tty */
550 * Cumulative resource counters for dead threads in the group,
551 * and for reaped dead child processes forked by this group.
552 * Live threads maintain their own counters and add to these
553 * in __exit_signal, except for the group leader.
555 cputime_t cutime, cstime;
558 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
559 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
560 unsigned long inblock, oublock, cinblock, coublock;
561 struct task_io_accounting ioac;
564 * We don't bother to synchronize most readers of this at all,
565 * because there is no reader checking a limit that actually needs
566 * to get both rlim_cur and rlim_max atomically, and either one
567 * alone is a single word that can safely be read normally.
568 * getrlimit/setrlimit use task_lock(current->group_leader) to
569 * protect this instead of the siglock, because they really
570 * have no need to disable irqs.
572 struct rlimit rlim[RLIM_NLIMITS];
574 /* keep the process-shared keyrings here so that they do the right
575 * thing in threads created with CLONE_THREAD */
577 struct key *session_keyring; /* keyring inherited over fork */
578 struct key *process_keyring; /* keyring private to this process */
580 #ifdef CONFIG_BSD_PROCESS_ACCT
581 struct pacct_struct pacct; /* per-process accounting information */
583 #ifdef CONFIG_TASKSTATS
584 struct taskstats *stats;
588 struct tty_audit_buf *tty_audit_buf;
592 /* Context switch must be unlocked if interrupts are to be enabled */
593 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
594 # define __ARCH_WANT_UNLOCKED_CTXSW
598 * Bits in flags field of signal_struct.
600 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
601 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
602 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
603 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
605 * Pending notifications to parent.
607 #define SIGNAL_CLD_STOPPED 0x00000010
608 #define SIGNAL_CLD_CONTINUED 0x00000020
609 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
611 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
613 /* If true, all threads except ->group_exit_task have pending SIGKILL */
614 static inline int signal_group_exit(const struct signal_struct *sig)
616 return (sig->flags & SIGNAL_GROUP_EXIT) ||
617 (sig->group_exit_task != NULL);
621 * Some day this will be a full-fledged user tracking system..
624 atomic_t __count; /* reference count */
625 atomic_t processes; /* How many processes does this user have? */
626 atomic_t files; /* How many open files does this user have? */
627 atomic_t sigpending; /* How many pending signals does this user have? */
628 #ifdef CONFIG_INOTIFY_USER
629 atomic_t inotify_watches; /* How many inotify watches does this user have? */
630 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
633 atomic_t epoll_devs; /* The number of epoll descriptors currently open */
634 atomic_t epoll_watches; /* The number of file descriptors currently watched */
636 #ifdef CONFIG_POSIX_MQUEUE
637 /* protected by mq_lock */
638 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
640 unsigned long locked_shm; /* How many pages of mlocked shm ? */
643 struct key *uid_keyring; /* UID specific keyring */
644 struct key *session_keyring; /* UID's default session keyring */
647 /* Hash table maintenance information */
648 struct hlist_node uidhash_node;
651 #ifdef CONFIG_USER_SCHED
652 struct task_group *tg;
655 struct work_struct work;
660 extern int uids_sysfs_init(void);
662 extern struct user_struct *find_user(uid_t);
664 extern struct user_struct root_user;
665 #define INIT_USER (&root_user)
667 struct backing_dev_info;
668 struct reclaim_state;
670 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
672 /* cumulative counters */
673 unsigned long pcount; /* # of times run on this cpu */
674 unsigned long long cpu_time, /* time spent on the cpu */
675 run_delay; /* time spent waiting on a runqueue */
678 unsigned long long last_arrival,/* when we last ran on a cpu */
679 last_queued; /* when we were last queued to run */
680 #ifdef CONFIG_SCHEDSTATS
682 unsigned int bkl_count;
685 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
687 #ifdef CONFIG_TASK_DELAY_ACCT
688 struct task_delay_info {
690 unsigned int flags; /* Private per-task flags */
692 /* For each stat XXX, add following, aligned appropriately
694 * struct timespec XXX_start, XXX_end;
698 * Atomicity of updates to XXX_delay, XXX_count protected by
699 * single lock above (split into XXX_lock if contention is an issue).
703 * XXX_count is incremented on every XXX operation, the delay
704 * associated with the operation is added to XXX_delay.
705 * XXX_delay contains the accumulated delay time in nanoseconds.
707 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
708 u64 blkio_delay; /* wait for sync block io completion */
709 u64 swapin_delay; /* wait for swapin block io completion */
710 u32 blkio_count; /* total count of the number of sync block */
711 /* io operations performed */
712 u32 swapin_count; /* total count of the number of swapin block */
713 /* io operations performed */
715 struct timespec freepages_start, freepages_end;
716 u64 freepages_delay; /* wait for memory reclaim */
717 u32 freepages_count; /* total count of memory reclaim */
719 #endif /* CONFIG_TASK_DELAY_ACCT */
721 static inline int sched_info_on(void)
723 #ifdef CONFIG_SCHEDSTATS
725 #elif defined(CONFIG_TASK_DELAY_ACCT)
726 extern int delayacct_on;
741 * sched-domains (multiprocessor balancing) declarations:
745 * Increase resolution of nice-level calculations:
747 #define SCHED_LOAD_SHIFT 10
748 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
750 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
753 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
754 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
755 #define SD_BALANCE_EXEC 4 /* Balance on exec */
756 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
757 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
758 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
759 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
760 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
761 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
762 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
763 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
764 #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
766 #define BALANCE_FOR_MC_POWER \
767 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
769 #define BALANCE_FOR_PKG_POWER \
770 ((sched_mc_power_savings || sched_smt_power_savings) ? \
771 SD_POWERSAVINGS_BALANCE : 0)
773 #define test_sd_parent(sd, flag) ((sd->parent && \
774 (sd->parent->flags & flag)) ? 1 : 0)
778 struct sched_group *next; /* Must be a circular list */
781 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
782 * single CPU. This is read only (except for setup, hotplug CPU).
783 * Note : Never change cpu_power without recompute its reciprocal
785 unsigned int __cpu_power;
787 * reciprocal value of cpu_power to avoid expensive divides
788 * (see include/linux/reciprocal_div.h)
790 u32 reciprocal_cpu_power;
792 unsigned long cpumask[];
795 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
797 return to_cpumask(sg->cpumask);
800 enum sched_domain_level {
810 struct sched_domain_attr {
811 int relax_domain_level;
814 #define SD_ATTR_INIT (struct sched_domain_attr) { \
815 .relax_domain_level = -1, \
818 struct sched_domain {
819 /* These fields must be setup */
820 struct sched_domain *parent; /* top domain must be null terminated */
821 struct sched_domain *child; /* bottom domain must be null terminated */
822 struct sched_group *groups; /* the balancing groups of the domain */
823 unsigned long min_interval; /* Minimum balance interval ms */
824 unsigned long max_interval; /* Maximum balance interval ms */
825 unsigned int busy_factor; /* less balancing by factor if busy */
826 unsigned int imbalance_pct; /* No balance until over watermark */
827 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
828 unsigned int busy_idx;
829 unsigned int idle_idx;
830 unsigned int newidle_idx;
831 unsigned int wake_idx;
832 unsigned int forkexec_idx;
833 int flags; /* See SD_* */
834 enum sched_domain_level level;
836 /* Runtime fields. */
837 unsigned long last_balance; /* init to jiffies. units in jiffies */
838 unsigned int balance_interval; /* initialise to 1. units in ms. */
839 unsigned int nr_balance_failed; /* initialise to 0 */
843 #ifdef CONFIG_SCHEDSTATS
844 /* load_balance() stats */
845 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
846 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
847 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
848 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
849 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
850 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
851 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
852 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
854 /* Active load balancing */
855 unsigned int alb_count;
856 unsigned int alb_failed;
857 unsigned int alb_pushed;
859 /* SD_BALANCE_EXEC stats */
860 unsigned int sbe_count;
861 unsigned int sbe_balanced;
862 unsigned int sbe_pushed;
864 /* SD_BALANCE_FORK stats */
865 unsigned int sbf_count;
866 unsigned int sbf_balanced;
867 unsigned int sbf_pushed;
869 /* try_to_wake_up() stats */
870 unsigned int ttwu_wake_remote;
871 unsigned int ttwu_move_affine;
872 unsigned int ttwu_move_balance;
874 #ifdef CONFIG_SCHED_DEBUG
878 /* span of all CPUs in this domain */
879 unsigned long span[];
882 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
884 return to_cpumask(sd->span);
887 extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
888 struct sched_domain_attr *dattr_new);
889 extern int arch_reinit_sched_domains(void);
891 #else /* CONFIG_SMP */
893 struct sched_domain_attr;
896 partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
897 struct sched_domain_attr *dattr_new)
900 #endif /* !CONFIG_SMP */
902 struct io_context; /* See blkdev.h */
903 #define NGROUPS_SMALL 32
904 #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
908 gid_t small_block[NGROUPS_SMALL];
914 * get_group_info() must be called with the owning task locked (via task_lock())
915 * when task != current. The reason being that the vast majority of callers are
916 * looking at current->group_info, which can not be changed except by the
917 * current task. Changing current->group_info requires the task lock, too.
919 #define get_group_info(group_info) do { \
920 atomic_inc(&(group_info)->usage); \
923 #define put_group_info(group_info) do { \
924 if (atomic_dec_and_test(&(group_info)->usage)) \
925 groups_free(group_info); \
928 extern struct group_info *groups_alloc(int gidsetsize);
929 extern void groups_free(struct group_info *group_info);
930 extern int set_current_groups(struct group_info *group_info);
931 extern int groups_search(struct group_info *group_info, gid_t grp);
932 /* access the groups "array" with this macro */
933 #define GROUP_AT(gi, i) \
934 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
936 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
937 extern void prefetch_stack(struct task_struct *t);
939 static inline void prefetch_stack(struct task_struct *t) { }
942 struct audit_context; /* See audit.c */
944 struct pipe_inode_info;
945 struct uts_namespace;
951 const struct sched_class *next;
953 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
954 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
955 void (*yield_task) (struct rq *rq);
957 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
959 struct task_struct * (*pick_next_task) (struct rq *rq);
960 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
963 int (*select_task_rq)(struct task_struct *p, int sync);
965 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
966 struct rq *busiest, unsigned long max_load_move,
967 struct sched_domain *sd, enum cpu_idle_type idle,
968 int *all_pinned, int *this_best_prio);
970 int (*move_one_task) (struct rq *this_rq, int this_cpu,
971 struct rq *busiest, struct sched_domain *sd,
972 enum cpu_idle_type idle);
973 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
974 void (*post_schedule) (struct rq *this_rq);
975 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
977 void (*set_cpus_allowed)(struct task_struct *p,
978 const struct cpumask *newmask);
980 void (*rq_online)(struct rq *rq);
981 void (*rq_offline)(struct rq *rq);
984 void (*set_curr_task) (struct rq *rq);
985 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
986 void (*task_new) (struct rq *rq, struct task_struct *p);
988 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
990 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
992 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
993 int oldprio, int running);
995 #ifdef CONFIG_FAIR_GROUP_SCHED
996 void (*moved_group) (struct task_struct *p);
1000 struct load_weight {
1001 unsigned long weight, inv_weight;
1005 * CFS stats for a schedulable entity (task, task-group etc)
1007 * Current field usage histogram:
1014 struct sched_entity {
1015 struct load_weight load; /* for load-balancing */
1016 struct rb_node run_node;
1017 struct list_head group_node;
1021 u64 sum_exec_runtime;
1023 u64 prev_sum_exec_runtime;
1028 #ifdef CONFIG_SCHEDSTATS
1036 s64 sum_sleep_runtime;
1044 u64 nr_migrations_cold;
1045 u64 nr_failed_migrations_affine;
1046 u64 nr_failed_migrations_running;
1047 u64 nr_failed_migrations_hot;
1048 u64 nr_forced_migrations;
1049 u64 nr_forced2_migrations;
1052 u64 nr_wakeups_sync;
1053 u64 nr_wakeups_migrate;
1054 u64 nr_wakeups_local;
1055 u64 nr_wakeups_remote;
1056 u64 nr_wakeups_affine;
1057 u64 nr_wakeups_affine_attempts;
1058 u64 nr_wakeups_passive;
1059 u64 nr_wakeups_idle;
1062 #ifdef CONFIG_FAIR_GROUP_SCHED
1063 struct sched_entity *parent;
1064 /* rq on which this entity is (to be) queued: */
1065 struct cfs_rq *cfs_rq;
1066 /* rq "owned" by this entity/group: */
1067 struct cfs_rq *my_q;
1071 struct sched_rt_entity {
1072 struct list_head run_list;
1073 unsigned long timeout;
1074 unsigned int time_slice;
1075 int nr_cpus_allowed;
1077 struct sched_rt_entity *back;
1078 #ifdef CONFIG_RT_GROUP_SCHED
1079 struct sched_rt_entity *parent;
1080 /* rq on which this entity is (to be) queued: */
1081 struct rt_rq *rt_rq;
1082 /* rq "owned" by this entity/group: */
1087 struct task_struct {
1088 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1091 unsigned int flags; /* per process flags, defined below */
1092 unsigned int ptrace;
1094 int lock_depth; /* BKL lock depth */
1097 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1102 int prio, static_prio, normal_prio;
1103 unsigned int rt_priority;
1104 const struct sched_class *sched_class;
1105 struct sched_entity se;
1106 struct sched_rt_entity rt;
1108 #ifdef CONFIG_PREEMPT_NOTIFIERS
1109 /* list of struct preempt_notifier: */
1110 struct hlist_head preempt_notifiers;
1114 * fpu_counter contains the number of consecutive context switches
1115 * that the FPU is used. If this is over a threshold, the lazy fpu
1116 * saving becomes unlazy to save the trap. This is an unsigned char
1117 * so that after 256 times the counter wraps and the behavior turns
1118 * lazy again; this to deal with bursty apps that only use FPU for
1121 unsigned char fpu_counter;
1122 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
1123 #ifdef CONFIG_BLK_DEV_IO_TRACE
1124 unsigned int btrace_seq;
1127 unsigned int policy;
1128 cpumask_t cpus_allowed;
1130 #ifdef CONFIG_PREEMPT_RCU
1131 int rcu_read_lock_nesting;
1132 int rcu_flipctr_idx;
1133 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1135 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1136 struct sched_info sched_info;
1139 struct list_head tasks;
1141 struct mm_struct *mm, *active_mm;
1144 struct linux_binfmt *binfmt;
1146 int exit_code, exit_signal;
1147 int pdeath_signal; /* The signal sent when the parent dies */
1149 unsigned int personality;
1150 unsigned did_exec:1;
1154 #ifdef CONFIG_CC_STACKPROTECTOR
1155 /* Canary value for the -fstack-protector gcc feature */
1156 unsigned long stack_canary;
1159 * pointers to (original) parent process, youngest child, younger sibling,
1160 * older sibling, respectively. (p->father can be replaced with
1161 * p->real_parent->pid)
1163 struct task_struct *real_parent; /* real parent process */
1164 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1166 * children/sibling forms the list of my natural children
1168 struct list_head children; /* list of my children */
1169 struct list_head sibling; /* linkage in my parent's children list */
1170 struct task_struct *group_leader; /* threadgroup leader */
1173 * ptraced is the list of tasks this task is using ptrace on.
1174 * This includes both natural children and PTRACE_ATTACH targets.
1175 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1177 struct list_head ptraced;
1178 struct list_head ptrace_entry;
1180 #ifdef CONFIG_X86_PTRACE_BTS
1182 * This is the tracer handle for the ptrace BTS extension.
1183 * This field actually belongs to the ptracer task.
1185 struct bts_tracer *bts;
1187 * The buffer to hold the BTS data.
1190 #endif /* CONFIG_X86_PTRACE_BTS */
1192 /* PID/PID hash table linkage. */
1193 struct pid_link pids[PIDTYPE_MAX];
1194 struct list_head thread_group;
1196 struct completion *vfork_done; /* for vfork() */
1197 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1198 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1200 cputime_t utime, stime, utimescaled, stimescaled;
1202 cputime_t prev_utime, prev_stime;
1203 unsigned long nvcsw, nivcsw; /* context switch counts */
1204 struct timespec start_time; /* monotonic time */
1205 struct timespec real_start_time; /* boot based time */
1206 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1207 unsigned long min_flt, maj_flt;
1209 struct task_cputime cputime_expires;
1210 struct list_head cpu_timers[3];
1212 /* process credentials */
1213 uid_t uid,euid,suid,fsuid;
1214 gid_t gid,egid,sgid,fsgid;
1215 struct group_info *group_info;
1216 kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset;
1217 struct user_struct *user;
1218 unsigned securebits;
1220 unsigned char jit_keyring; /* default keyring to attach requested keys to */
1221 struct key *request_key_auth; /* assumed request_key authority */
1222 struct key *thread_keyring; /* keyring private to this thread */
1224 char comm[TASK_COMM_LEN]; /* executable name excluding path
1225 - access with [gs]et_task_comm (which lock
1226 it with task_lock())
1227 - initialized normally by flush_old_exec */
1228 /* file system info */
1229 int link_count, total_link_count;
1230 #ifdef CONFIG_SYSVIPC
1232 struct sysv_sem sysvsem;
1234 #ifdef CONFIG_DETECT_SOFTLOCKUP
1235 /* hung task detection */
1236 unsigned long last_switch_timestamp;
1237 unsigned long last_switch_count;
1239 /* CPU-specific state of this task */
1240 struct thread_struct thread;
1241 /* filesystem information */
1242 struct fs_struct *fs;
1243 /* open file information */
1244 struct files_struct *files;
1246 struct nsproxy *nsproxy;
1247 /* signal handlers */
1248 struct signal_struct *signal;
1249 struct sighand_struct *sighand;
1251 sigset_t blocked, real_blocked;
1252 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1253 struct sigpending pending;
1255 unsigned long sas_ss_sp;
1257 int (*notifier)(void *priv);
1258 void *notifier_data;
1259 sigset_t *notifier_mask;
1260 #ifdef CONFIG_SECURITY
1263 struct audit_context *audit_context;
1264 #ifdef CONFIG_AUDITSYSCALL
1266 unsigned int sessionid;
1270 /* Thread group tracking */
1273 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1274 spinlock_t alloc_lock;
1276 /* Protection of the PI data structures: */
1279 #ifdef CONFIG_RT_MUTEXES
1280 /* PI waiters blocked on a rt_mutex held by this task */
1281 struct plist_head pi_waiters;
1282 /* Deadlock detection and priority inheritance handling */
1283 struct rt_mutex_waiter *pi_blocked_on;
1286 #ifdef CONFIG_DEBUG_MUTEXES
1287 /* mutex deadlock detection */
1288 struct mutex_waiter *blocked_on;
1290 #ifdef CONFIG_TRACE_IRQFLAGS
1291 unsigned int irq_events;
1292 int hardirqs_enabled;
1293 unsigned long hardirq_enable_ip;
1294 unsigned int hardirq_enable_event;
1295 unsigned long hardirq_disable_ip;
1296 unsigned int hardirq_disable_event;
1297 int softirqs_enabled;
1298 unsigned long softirq_disable_ip;
1299 unsigned int softirq_disable_event;
1300 unsigned long softirq_enable_ip;
1301 unsigned int softirq_enable_event;
1302 int hardirq_context;
1303 int softirq_context;
1305 #ifdef CONFIG_LOCKDEP
1306 # define MAX_LOCK_DEPTH 48UL
1309 unsigned int lockdep_recursion;
1310 struct held_lock held_locks[MAX_LOCK_DEPTH];
1313 /* journalling filesystem info */
1316 /* stacked block device info */
1317 struct bio *bio_list, **bio_tail;
1320 struct reclaim_state *reclaim_state;
1322 struct backing_dev_info *backing_dev_info;
1324 struct io_context *io_context;
1326 unsigned long ptrace_message;
1327 siginfo_t *last_siginfo; /* For ptrace use. */
1328 struct task_io_accounting ioac;
1329 #if defined(CONFIG_TASK_XACCT)
1330 u64 acct_rss_mem1; /* accumulated rss usage */
1331 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1332 cputime_t acct_timexpd; /* stime + utime since last update */
1334 #ifdef CONFIG_CPUSETS
1335 nodemask_t mems_allowed;
1336 int cpuset_mems_generation;
1337 int cpuset_mem_spread_rotor;
1339 #ifdef CONFIG_CGROUPS
1340 /* Control Group info protected by css_set_lock */
1341 struct css_set *cgroups;
1342 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1343 struct list_head cg_list;
1346 struct robust_list_head __user *robust_list;
1347 #ifdef CONFIG_COMPAT
1348 struct compat_robust_list_head __user *compat_robust_list;
1350 struct list_head pi_state_list;
1351 struct futex_pi_state *pi_state_cache;
1354 struct mempolicy *mempolicy;
1357 atomic_t fs_excl; /* holding fs exclusive resources */
1358 struct rcu_head rcu;
1361 * cache last used pipe for splice
1363 struct pipe_inode_info *splice_pipe;
1364 #ifdef CONFIG_TASK_DELAY_ACCT
1365 struct task_delay_info *delays;
1367 #ifdef CONFIG_FAULT_INJECTION
1370 struct prop_local_single dirties;
1371 #ifdef CONFIG_LATENCYTOP
1372 int latency_record_count;
1373 struct latency_record latency_record[LT_SAVECOUNT];
1376 * time slack values; these are used to round up poll() and
1377 * select() etc timeout values. These are in nanoseconds.
1379 unsigned long timer_slack_ns;
1380 unsigned long default_timer_slack_ns;
1382 struct list_head *scm_work_list;
1383 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1384 /* Index of current stored adress in ret_stack */
1386 /* Stack of return addresses for return function tracing */
1387 struct ftrace_ret_stack *ret_stack;
1389 * Number of functions that haven't been traced
1390 * because of depth overrun.
1392 atomic_t trace_overrun;
1393 /* Pause for the tracing */
1394 atomic_t tracing_graph_pause;
1396 #ifdef CONFIG_TRACING
1397 /* state flags for use by tracers */
1398 unsigned long trace;
1403 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1404 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1405 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1406 * values are inverted: lower p->prio value means higher priority.
1408 * The MAX_USER_RT_PRIO value allows the actual maximum
1409 * RT priority to be separate from the value exported to
1410 * user-space. This allows kernel threads to set their
1411 * priority to a value higher than any user task. Note:
1412 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1415 #define MAX_USER_RT_PRIO 100
1416 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1418 #define MAX_PRIO (MAX_RT_PRIO + 40)
1419 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1421 static inline int rt_prio(int prio)
1423 if (unlikely(prio < MAX_RT_PRIO))
1428 static inline int rt_task(struct task_struct *p)
1430 return rt_prio(p->prio);
1433 static inline void set_task_session(struct task_struct *tsk, pid_t session)
1435 tsk->signal->__session = session;
1438 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1440 tsk->signal->__pgrp = pgrp;
1443 static inline struct pid *task_pid(struct task_struct *task)
1445 return task->pids[PIDTYPE_PID].pid;
1448 static inline struct pid *task_tgid(struct task_struct *task)
1450 return task->group_leader->pids[PIDTYPE_PID].pid;
1453 static inline struct pid *task_pgrp(struct task_struct *task)
1455 return task->group_leader->pids[PIDTYPE_PGID].pid;
1458 static inline struct pid *task_session(struct task_struct *task)
1460 return task->group_leader->pids[PIDTYPE_SID].pid;
1463 struct pid_namespace;
1466 * the helpers to get the task's different pids as they are seen
1467 * from various namespaces
1469 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1470 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1472 * task_xid_nr_ns() : id seen from the ns specified;
1474 * set_task_vxid() : assigns a virtual id to a task;
1476 * see also pid_nr() etc in include/linux/pid.h
1479 static inline pid_t task_pid_nr(struct task_struct *tsk)
1484 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1486 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1488 return pid_vnr(task_pid(tsk));
1492 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1497 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1499 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1501 return pid_vnr(task_tgid(tsk));
1505 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1507 return tsk->signal->__pgrp;
1510 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1512 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1514 return pid_vnr(task_pgrp(tsk));
1518 static inline pid_t task_session_nr(struct task_struct *tsk)
1520 return tsk->signal->__session;
1523 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1525 static inline pid_t task_session_vnr(struct task_struct *tsk)
1527 return pid_vnr(task_session(tsk));
1532 * pid_alive - check that a task structure is not stale
1533 * @p: Task structure to be checked.
1535 * Test if a process is not yet dead (at most zombie state)
1536 * If pid_alive fails, then pointers within the task structure
1537 * can be stale and must not be dereferenced.
1539 static inline int pid_alive(struct task_struct *p)
1541 return p->pids[PIDTYPE_PID].pid != NULL;
1545 * is_global_init - check if a task structure is init
1546 * @tsk: Task structure to be checked.
1548 * Check if a task structure is the first user space task the kernel created.
1550 static inline int is_global_init(struct task_struct *tsk)
1552 return tsk->pid == 1;
1556 * is_container_init:
1557 * check whether in the task is init in its own pid namespace.
1559 extern int is_container_init(struct task_struct *tsk);
1561 extern struct pid *cad_pid;
1563 extern void free_task(struct task_struct *tsk);
1564 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1566 extern void __put_task_struct(struct task_struct *t);
1568 static inline void put_task_struct(struct task_struct *t)
1570 if (atomic_dec_and_test(&t->usage))
1571 __put_task_struct(t);
1574 extern cputime_t task_utime(struct task_struct *p);
1575 extern cputime_t task_stime(struct task_struct *p);
1576 extern cputime_t task_gtime(struct task_struct *p);
1581 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1582 /* Not implemented yet, only for 486*/
1583 #define PF_STARTING 0x00000002 /* being created */
1584 #define PF_EXITING 0x00000004 /* getting shut down */
1585 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1586 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1587 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1588 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1589 #define PF_DUMPCORE 0x00000200 /* dumped core */
1590 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1591 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1592 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1593 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1594 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1595 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1596 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1597 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1598 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1599 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1600 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1601 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1602 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1603 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1604 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1605 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1606 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1607 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1608 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1609 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1612 * Only the _current_ task can read/write to tsk->flags, but other
1613 * tasks can access tsk->flags in readonly mode for example
1614 * with tsk_used_math (like during threaded core dumping).
1615 * There is however an exception to this rule during ptrace
1616 * or during fork: the ptracer task is allowed to write to the
1617 * child->flags of its traced child (same goes for fork, the parent
1618 * can write to the child->flags), because we're guaranteed the
1619 * child is not running and in turn not changing child->flags
1620 * at the same time the parent does it.
1622 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1623 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1624 #define clear_used_math() clear_stopped_child_used_math(current)
1625 #define set_used_math() set_stopped_child_used_math(current)
1626 #define conditional_stopped_child_used_math(condition, child) \
1627 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1628 #define conditional_used_math(condition) \
1629 conditional_stopped_child_used_math(condition, current)
1630 #define copy_to_stopped_child_used_math(child) \
1631 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1632 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1633 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1634 #define used_math() tsk_used_math(current)
1637 extern int set_cpus_allowed_ptr(struct task_struct *p,
1638 const struct cpumask *new_mask);
1640 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1641 const struct cpumask *new_mask)
1643 if (!cpumask_test_cpu(0, new_mask))
1648 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1650 return set_cpus_allowed_ptr(p, &new_mask);
1653 extern unsigned long long sched_clock(void);
1655 extern void sched_clock_init(void);
1656 extern u64 sched_clock_cpu(int cpu);
1658 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1659 static inline void sched_clock_tick(void)
1663 static inline void sched_clock_idle_sleep_event(void)
1667 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1671 extern void sched_clock_tick(void);
1672 extern void sched_clock_idle_sleep_event(void);
1673 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1677 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1678 * clock constructed from sched_clock():
1680 extern unsigned long long cpu_clock(int cpu);
1682 extern unsigned long long
1683 task_sched_runtime(struct task_struct *task);
1684 extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1686 /* sched_exec is called by processes performing an exec */
1688 extern void sched_exec(void);
1690 #define sched_exec() {}
1693 extern void sched_clock_idle_sleep_event(void);
1694 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1696 #ifdef CONFIG_HOTPLUG_CPU
1697 extern void idle_task_exit(void);
1699 static inline void idle_task_exit(void) {}
1702 extern void sched_idle_next(void);
1704 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1705 extern void wake_up_idle_cpu(int cpu);
1707 static inline void wake_up_idle_cpu(int cpu) { }
1710 #ifdef CONFIG_SCHED_DEBUG
1711 extern unsigned int sysctl_sched_latency;
1712 extern unsigned int sysctl_sched_min_granularity;
1713 extern unsigned int sysctl_sched_wakeup_granularity;
1714 extern unsigned int sysctl_sched_child_runs_first;
1715 extern unsigned int sysctl_sched_features;
1716 extern unsigned int sysctl_sched_migration_cost;
1717 extern unsigned int sysctl_sched_nr_migrate;
1718 extern unsigned int sysctl_sched_shares_ratelimit;
1719 extern unsigned int sysctl_sched_shares_thresh;
1721 int sched_nr_latency_handler(struct ctl_table *table, int write,
1722 struct file *file, void __user *buffer, size_t *length,
1725 extern unsigned int sysctl_sched_rt_period;
1726 extern int sysctl_sched_rt_runtime;
1728 int sched_rt_handler(struct ctl_table *table, int write,
1729 struct file *filp, void __user *buffer, size_t *lenp,
1732 extern unsigned int sysctl_sched_compat_yield;
1734 #ifdef CONFIG_RT_MUTEXES
1735 extern int rt_mutex_getprio(struct task_struct *p);
1736 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1737 extern void rt_mutex_adjust_pi(struct task_struct *p);
1739 static inline int rt_mutex_getprio(struct task_struct *p)
1741 return p->normal_prio;
1743 # define rt_mutex_adjust_pi(p) do { } while (0)
1746 extern void set_user_nice(struct task_struct *p, long nice);
1747 extern int task_prio(const struct task_struct *p);
1748 extern int task_nice(const struct task_struct *p);
1749 extern int can_nice(const struct task_struct *p, const int nice);
1750 extern int task_curr(const struct task_struct *p);
1751 extern int idle_cpu(int cpu);
1752 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1753 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1754 struct sched_param *);
1755 extern struct task_struct *idle_task(int cpu);
1756 extern struct task_struct *curr_task(int cpu);
1757 extern void set_curr_task(int cpu, struct task_struct *p);
1762 * The default (Linux) execution domain.
1764 extern struct exec_domain default_exec_domain;
1766 union thread_union {
1767 struct thread_info thread_info;
1768 unsigned long stack[THREAD_SIZE/sizeof(long)];
1771 #ifndef __HAVE_ARCH_KSTACK_END
1772 static inline int kstack_end(void *addr)
1774 /* Reliable end of stack detection:
1775 * Some APM bios versions misalign the stack
1777 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1781 extern union thread_union init_thread_union;
1782 extern struct task_struct init_task;
1784 extern struct mm_struct init_mm;
1786 extern struct pid_namespace init_pid_ns;
1789 * find a task by one of its numerical ids
1791 * find_task_by_pid_type_ns():
1792 * it is the most generic call - it finds a task by all id,
1793 * type and namespace specified
1794 * find_task_by_pid_ns():
1795 * finds a task by its pid in the specified namespace
1796 * find_task_by_vpid():
1797 * finds a task by its virtual pid
1799 * see also find_vpid() etc in include/linux/pid.h
1802 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1803 struct pid_namespace *ns);
1805 extern struct task_struct *find_task_by_vpid(pid_t nr);
1806 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1807 struct pid_namespace *ns);
1809 extern void __set_special_pids(struct pid *pid);
1811 /* per-UID process charging. */
1812 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1813 static inline struct user_struct *get_uid(struct user_struct *u)
1815 atomic_inc(&u->__count);
1818 extern void free_uid(struct user_struct *);
1819 extern void switch_uid(struct user_struct *);
1820 extern void release_uids(struct user_namespace *ns);
1822 #include <asm/current.h>
1824 extern void do_timer(unsigned long ticks);
1826 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1827 extern int wake_up_process(struct task_struct *tsk);
1828 extern void wake_up_new_task(struct task_struct *tsk,
1829 unsigned long clone_flags);
1831 extern void kick_process(struct task_struct *tsk);
1833 static inline void kick_process(struct task_struct *tsk) { }
1835 extern void sched_fork(struct task_struct *p, int clone_flags);
1836 extern void sched_dead(struct task_struct *p);
1838 extern int in_group_p(gid_t);
1839 extern int in_egroup_p(gid_t);
1841 extern void proc_caches_init(void);
1842 extern void flush_signals(struct task_struct *);
1843 extern void ignore_signals(struct task_struct *);
1844 extern void flush_signal_handlers(struct task_struct *, int force_default);
1845 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1847 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1849 unsigned long flags;
1852 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1853 ret = dequeue_signal(tsk, mask, info);
1854 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1859 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1861 extern void unblock_all_signals(void);
1862 extern void release_task(struct task_struct * p);
1863 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1864 extern int force_sigsegv(int, struct task_struct *);
1865 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1866 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1867 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1868 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1869 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1870 extern int kill_pid(struct pid *pid, int sig, int priv);
1871 extern int kill_proc_info(int, struct siginfo *, pid_t);
1872 extern int do_notify_parent(struct task_struct *, int);
1873 extern void force_sig(int, struct task_struct *);
1874 extern void force_sig_specific(int, struct task_struct *);
1875 extern int send_sig(int, struct task_struct *, int);
1876 extern void zap_other_threads(struct task_struct *p);
1877 extern struct sigqueue *sigqueue_alloc(void);
1878 extern void sigqueue_free(struct sigqueue *);
1879 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
1880 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1881 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1883 static inline int kill_cad_pid(int sig, int priv)
1885 return kill_pid(cad_pid, sig, priv);
1888 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1889 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1890 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1891 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1893 static inline int is_si_special(const struct siginfo *info)
1895 return info <= SEND_SIG_FORCED;
1898 /* True if we are on the alternate signal stack. */
1900 static inline int on_sig_stack(unsigned long sp)
1902 return (sp - current->sas_ss_sp < current->sas_ss_size);
1905 static inline int sas_ss_flags(unsigned long sp)
1907 return (current->sas_ss_size == 0 ? SS_DISABLE
1908 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1912 * Routines for handling mm_structs
1914 extern struct mm_struct * mm_alloc(void);
1916 /* mmdrop drops the mm and the page tables */
1917 extern void __mmdrop(struct mm_struct *);
1918 static inline void mmdrop(struct mm_struct * mm)
1920 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1924 /* mmput gets rid of the mappings and all user-space */
1925 extern void mmput(struct mm_struct *);
1926 /* Grab a reference to a task's mm, if it is not already going away */
1927 extern struct mm_struct *get_task_mm(struct task_struct *task);
1928 /* Remove the current tasks stale references to the old mm_struct */
1929 extern void mm_release(struct task_struct *, struct mm_struct *);
1930 /* Allocate a new mm structure and copy contents from tsk->mm */
1931 extern struct mm_struct *dup_mm(struct task_struct *tsk);
1933 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1934 extern void flush_thread(void);
1935 extern void exit_thread(void);
1937 extern void exit_files(struct task_struct *);
1938 extern void __cleanup_signal(struct signal_struct *);
1939 extern void __cleanup_sighand(struct sighand_struct *);
1941 extern void exit_itimers(struct signal_struct *);
1942 extern void flush_itimer_signals(void);
1944 extern NORET_TYPE void do_group_exit(int);
1946 extern void daemonize(const char *, ...);
1947 extern int allow_signal(int);
1948 extern int disallow_signal(int);
1950 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1951 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1952 struct task_struct *fork_idle(int);
1954 extern void set_task_comm(struct task_struct *tsk, char *from);
1955 extern char *get_task_comm(char *to, struct task_struct *tsk);
1958 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
1960 static inline unsigned long wait_task_inactive(struct task_struct *p,
1967 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1969 #define for_each_process(p) \
1970 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1973 * Careful: do_each_thread/while_each_thread is a double loop so
1974 * 'break' will not work as expected - use goto instead.
1976 #define do_each_thread(g, t) \
1977 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1979 #define while_each_thread(g, t) \
1980 while ((t = next_thread(t)) != g)
1982 /* de_thread depends on thread_group_leader not being a pid based check */
1983 #define thread_group_leader(p) (p == p->group_leader)
1985 /* Do to the insanities of de_thread it is possible for a process
1986 * to have the pid of the thread group leader without actually being
1987 * the thread group leader. For iteration through the pids in proc
1988 * all we care about is that we have a task with the appropriate
1989 * pid, we don't actually care if we have the right task.
1991 static inline int has_group_leader_pid(struct task_struct *p)
1993 return p->pid == p->tgid;
1997 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1999 return p1->tgid == p2->tgid;
2002 static inline struct task_struct *next_thread(const struct task_struct *p)
2004 return list_entry(rcu_dereference(p->thread_group.next),
2005 struct task_struct, thread_group);
2008 static inline int thread_group_empty(struct task_struct *p)
2010 return list_empty(&p->thread_group);
2013 #define delay_group_leader(p) \
2014 (thread_group_leader(p) && !thread_group_empty(p))
2017 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2018 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2019 * pins the final release of task.io_context. Also protects ->cpuset and
2020 * ->cgroup.subsys[].
2022 * Nests both inside and outside of read_lock(&tasklist_lock).
2023 * It must not be nested with write_lock_irq(&tasklist_lock),
2024 * neither inside nor outside.
2026 static inline void task_lock(struct task_struct *p)
2028 spin_lock(&p->alloc_lock);
2031 static inline void task_unlock(struct task_struct *p)
2033 spin_unlock(&p->alloc_lock);
2036 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2037 unsigned long *flags);
2039 static inline void unlock_task_sighand(struct task_struct *tsk,
2040 unsigned long *flags)
2042 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2045 #ifndef __HAVE_THREAD_FUNCTIONS
2047 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2048 #define task_stack_page(task) ((task)->stack)
2050 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2052 *task_thread_info(p) = *task_thread_info(org);
2053 task_thread_info(p)->task = p;
2056 static inline unsigned long *end_of_stack(struct task_struct *p)
2058 return (unsigned long *)(task_thread_info(p) + 1);
2063 static inline int object_is_on_stack(void *obj)
2065 void *stack = task_stack_page(current);
2067 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2070 extern void thread_info_cache_init(void);
2072 /* set thread flags in other task's structures
2073 * - see asm/thread_info.h for TIF_xxxx flags available
2075 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2077 set_ti_thread_flag(task_thread_info(tsk), flag);
2080 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2082 clear_ti_thread_flag(task_thread_info(tsk), flag);
2085 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2087 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2090 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2092 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2095 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2097 return test_ti_thread_flag(task_thread_info(tsk), flag);
2100 static inline void set_tsk_need_resched(struct task_struct *tsk)
2102 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2105 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2107 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2110 static inline int test_tsk_need_resched(struct task_struct *tsk)
2112 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2115 static inline int signal_pending(struct task_struct *p)
2117 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2120 extern int __fatal_signal_pending(struct task_struct *p);
2122 static inline int fatal_signal_pending(struct task_struct *p)
2124 return signal_pending(p) && __fatal_signal_pending(p);
2127 static inline int signal_pending_state(long state, struct task_struct *p)
2129 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2131 if (!signal_pending(p))
2134 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2137 static inline int need_resched(void)
2139 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2143 * cond_resched() and cond_resched_lock(): latency reduction via
2144 * explicit rescheduling in places that are safe. The return
2145 * value indicates whether a reschedule was done in fact.
2146 * cond_resched_lock() will drop the spinlock before scheduling,
2147 * cond_resched_softirq() will enable bhs before scheduling.
2149 extern int _cond_resched(void);
2150 #ifdef CONFIG_PREEMPT_BKL
2151 static inline int cond_resched(void)
2156 static inline int cond_resched(void)
2158 return _cond_resched();
2161 extern int cond_resched_lock(spinlock_t * lock);
2162 extern int cond_resched_softirq(void);
2163 static inline int cond_resched_bkl(void)
2165 return _cond_resched();
2169 * Does a critical section need to be broken due to another
2170 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2171 * but a general need for low latency)
2173 static inline int spin_needbreak(spinlock_t *lock)
2175 #ifdef CONFIG_PREEMPT
2176 return spin_is_contended(lock);
2183 * Thread group CPU time accounting.
2186 extern int thread_group_cputime_alloc(struct task_struct *);
2187 extern void thread_group_cputime(struct task_struct *, struct task_cputime *);
2189 static inline void thread_group_cputime_init(struct signal_struct *sig)
2191 sig->cputime.totals = NULL;
2194 static inline int thread_group_cputime_clone_thread(struct task_struct *curr)
2196 if (curr->signal->cputime.totals)
2198 return thread_group_cputime_alloc(curr);
2201 static inline void thread_group_cputime_free(struct signal_struct *sig)
2203 free_percpu(sig->cputime.totals);
2207 * Reevaluate whether the task has signals pending delivery.
2208 * Wake the task if so.
2209 * This is required every time the blocked sigset_t changes.
2210 * callers must hold sighand->siglock.
2212 extern void recalc_sigpending_and_wake(struct task_struct *t);
2213 extern void recalc_sigpending(void);
2215 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2218 * Wrappers for p->thread_info->cpu access. No-op on UP.
2222 static inline unsigned int task_cpu(const struct task_struct *p)
2224 return task_thread_info(p)->cpu;
2227 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2231 static inline unsigned int task_cpu(const struct task_struct *p)
2236 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2240 #endif /* CONFIG_SMP */
2242 extern void arch_pick_mmap_layout(struct mm_struct *mm);
2244 #ifdef CONFIG_TRACING
2246 __trace_special(void *__tr, void *__data,
2247 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2250 __trace_special(void *__tr, void *__data,
2251 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2256 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2257 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2259 extern int sched_mc_power_savings, sched_smt_power_savings;
2261 extern void normalize_rt_tasks(void);
2263 #ifdef CONFIG_GROUP_SCHED
2265 extern struct task_group init_task_group;
2266 #ifdef CONFIG_USER_SCHED
2267 extern struct task_group root_task_group;
2268 extern void set_tg_uid(struct user_struct *user);
2271 extern struct task_group *sched_create_group(struct task_group *parent);
2272 extern void sched_destroy_group(struct task_group *tg);
2273 extern void sched_move_task(struct task_struct *tsk);
2274 #ifdef CONFIG_FAIR_GROUP_SCHED
2275 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2276 extern unsigned long sched_group_shares(struct task_group *tg);
2278 #ifdef CONFIG_RT_GROUP_SCHED
2279 extern int sched_group_set_rt_runtime(struct task_group *tg,
2280 long rt_runtime_us);
2281 extern long sched_group_rt_runtime(struct task_group *tg);
2282 extern int sched_group_set_rt_period(struct task_group *tg,
2284 extern long sched_group_rt_period(struct task_group *tg);
2288 #ifdef CONFIG_TASK_XACCT
2289 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2291 tsk->ioac.rchar += amt;
2294 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2296 tsk->ioac.wchar += amt;
2299 static inline void inc_syscr(struct task_struct *tsk)
2304 static inline void inc_syscw(struct task_struct *tsk)
2309 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2313 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2317 static inline void inc_syscr(struct task_struct *tsk)
2321 static inline void inc_syscw(struct task_struct *tsk)
2326 #ifndef TASK_SIZE_OF
2327 #define TASK_SIZE_OF(tsk) TASK_SIZE
2330 #ifdef CONFIG_MM_OWNER
2331 extern void mm_update_next_owner(struct mm_struct *mm);
2332 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2334 static inline void mm_update_next_owner(struct mm_struct *mm)
2338 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2341 #endif /* CONFIG_MM_OWNER */
2343 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2345 #endif /* __KERNEL__ */