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;
101 * List of flags we want to share for kernel threads,
102 * if only because they are not used by them anyway.
104 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
107 * These are the constant used to fake the fixed-point load-average
108 * counting. Some notes:
109 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
110 * a load-average precision of 10 bits integer + 11 bits fractional
111 * - if you want to count load-averages more often, you need more
112 * precision, or rounding will get you. With 2-second counting freq,
113 * the EXP_n values would be 1981, 2034 and 2043 if still using only
116 extern unsigned long avenrun[]; /* Load averages */
118 #define FSHIFT 11 /* nr of bits of precision */
119 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
120 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
121 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
122 #define EXP_5 2014 /* 1/exp(5sec/5min) */
123 #define EXP_15 2037 /* 1/exp(5sec/15min) */
125 #define CALC_LOAD(load,exp,n) \
127 load += n*(FIXED_1-exp); \
130 extern unsigned long total_forks;
131 extern int nr_threads;
132 DECLARE_PER_CPU(unsigned long, process_counts);
133 extern int nr_processes(void);
134 extern unsigned long nr_running(void);
135 extern unsigned long nr_uninterruptible(void);
136 extern unsigned long nr_active(void);
137 extern unsigned long nr_iowait(void);
142 #ifdef CONFIG_SCHED_DEBUG
143 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
144 extern void proc_sched_set_task(struct task_struct *p);
146 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
149 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
152 static inline void proc_sched_set_task(struct task_struct *p)
156 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
161 extern unsigned long long time_sync_thresh;
164 * Task state bitmask. NOTE! These bits are also
165 * encoded in fs/proc/array.c: get_task_state().
167 * We have two separate sets of flags: task->state
168 * is about runnability, while task->exit_state are
169 * about the task exiting. Confusing, but this way
170 * modifying one set can't modify the other one by
173 #define TASK_RUNNING 0
174 #define TASK_INTERRUPTIBLE 1
175 #define TASK_UNINTERRUPTIBLE 2
176 #define __TASK_STOPPED 4
177 #define __TASK_TRACED 8
178 /* in tsk->exit_state */
179 #define EXIT_ZOMBIE 16
181 /* in tsk->state again */
183 #define TASK_WAKEKILL 128
185 /* Convenience macros for the sake of set_task_state */
186 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
187 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
188 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
190 /* Convenience macros for the sake of wake_up */
191 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
192 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
194 /* get_task_state() */
195 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
196 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
199 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
200 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
201 #define task_is_stopped_or_traced(task) \
202 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
203 #define task_contributes_to_load(task) \
204 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
206 #define __set_task_state(tsk, state_value) \
207 do { (tsk)->state = (state_value); } while (0)
208 #define set_task_state(tsk, state_value) \
209 set_mb((tsk)->state, (state_value))
212 * set_current_state() includes a barrier so that the write of current->state
213 * is correctly serialised wrt the caller's subsequent test of whether to
216 * set_current_state(TASK_UNINTERRUPTIBLE);
217 * if (do_i_need_to_sleep())
220 * If the caller does not need such serialisation then use __set_current_state()
222 #define __set_current_state(state_value) \
223 do { current->state = (state_value); } while (0)
224 #define set_current_state(state_value) \
225 set_mb(current->state, (state_value))
227 /* Task command name length */
228 #define TASK_COMM_LEN 16
230 #include <linux/spinlock.h>
233 * This serializes "schedule()" and also protects
234 * the run-queue from deletions/modifications (but
235 * _adding_ to the beginning of the run-queue has
238 extern rwlock_t tasklist_lock;
239 extern spinlock_t mmlist_lock;
243 extern void sched_init(void);
244 extern void sched_init_smp(void);
245 extern asmlinkage void schedule_tail(struct task_struct *prev);
246 extern void init_idle(struct task_struct *idle, int cpu);
247 extern void init_idle_bootup_task(struct task_struct *idle);
249 extern int runqueue_is_locked(void);
250 extern void task_rq_unlock_wait(struct task_struct *p);
252 extern cpumask_t nohz_cpu_mask;
253 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
254 extern int select_nohz_load_balancer(int cpu);
256 static inline int select_nohz_load_balancer(int cpu)
263 * Only dump TASK_* tasks. (0 for all tasks)
265 extern void show_state_filter(unsigned long state_filter);
267 static inline void show_state(void)
269 show_state_filter(0);
272 extern void show_regs(struct pt_regs *);
275 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
276 * task), SP is the stack pointer of the first frame that should be shown in the back
277 * trace (or NULL if the entire call-chain of the task should be shown).
279 extern void show_stack(struct task_struct *task, unsigned long *sp);
281 void io_schedule(void);
282 long io_schedule_timeout(long timeout);
284 extern void cpu_init (void);
285 extern void trap_init(void);
286 extern void account_process_tick(struct task_struct *task, int user);
287 extern void update_process_times(int user);
288 extern void scheduler_tick(void);
290 extern void sched_show_task(struct task_struct *p);
292 #ifdef CONFIG_DETECT_SOFTLOCKUP
293 extern void softlockup_tick(void);
294 extern void touch_softlockup_watchdog(void);
295 extern void touch_all_softlockup_watchdogs(void);
296 extern unsigned int softlockup_panic;
297 extern unsigned long sysctl_hung_task_check_count;
298 extern unsigned long sysctl_hung_task_timeout_secs;
299 extern unsigned long sysctl_hung_task_warnings;
300 extern int softlockup_thresh;
302 static inline void softlockup_tick(void)
305 static inline void spawn_softlockup_task(void)
308 static inline void touch_softlockup_watchdog(void)
311 static inline void touch_all_softlockup_watchdogs(void)
317 /* Attach to any functions which should be ignored in wchan output. */
318 #define __sched __attribute__((__section__(".sched.text")))
320 /* Linker adds these: start and end of __sched functions */
321 extern char __sched_text_start[], __sched_text_end[];
323 /* Is this address in the __sched functions? */
324 extern int in_sched_functions(unsigned long addr);
326 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
327 extern signed long schedule_timeout(signed long timeout);
328 extern signed long schedule_timeout_interruptible(signed long timeout);
329 extern signed long schedule_timeout_killable(signed long timeout);
330 extern signed long schedule_timeout_uninterruptible(signed long timeout);
331 asmlinkage void schedule(void);
334 struct user_namespace;
336 /* Maximum number of active map areas.. This is a random (large) number */
337 #define DEFAULT_MAX_MAP_COUNT 65536
339 extern int sysctl_max_map_count;
341 #include <linux/aio.h>
344 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
345 unsigned long, unsigned long);
347 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
348 unsigned long len, unsigned long pgoff,
349 unsigned long flags);
350 extern void arch_unmap_area(struct mm_struct *, unsigned long);
351 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
353 #if USE_SPLIT_PTLOCKS
355 * The mm counters are not protected by its page_table_lock,
356 * so must be incremented atomically.
358 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
359 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
360 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
361 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
362 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
364 #else /* !USE_SPLIT_PTLOCKS */
366 * The mm counters are protected by its page_table_lock,
367 * so can be incremented directly.
369 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
370 #define get_mm_counter(mm, member) ((mm)->_##member)
371 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
372 #define inc_mm_counter(mm, member) (mm)->_##member++
373 #define dec_mm_counter(mm, member) (mm)->_##member--
375 #endif /* !USE_SPLIT_PTLOCKS */
377 #define get_mm_rss(mm) \
378 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
379 #define update_hiwater_rss(mm) do { \
380 unsigned long _rss = get_mm_rss(mm); \
381 if ((mm)->hiwater_rss < _rss) \
382 (mm)->hiwater_rss = _rss; \
384 #define update_hiwater_vm(mm) do { \
385 if ((mm)->hiwater_vm < (mm)->total_vm) \
386 (mm)->hiwater_vm = (mm)->total_vm; \
389 extern void set_dumpable(struct mm_struct *mm, int value);
390 extern int get_dumpable(struct mm_struct *mm);
394 #define MMF_DUMPABLE 0 /* core dump is permitted */
395 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
396 #define MMF_DUMPABLE_BITS 2
398 /* coredump filter bits */
399 #define MMF_DUMP_ANON_PRIVATE 2
400 #define MMF_DUMP_ANON_SHARED 3
401 #define MMF_DUMP_MAPPED_PRIVATE 4
402 #define MMF_DUMP_MAPPED_SHARED 5
403 #define MMF_DUMP_ELF_HEADERS 6
404 #define MMF_DUMP_HUGETLB_PRIVATE 7
405 #define MMF_DUMP_HUGETLB_SHARED 8
406 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
407 #define MMF_DUMP_FILTER_BITS 7
408 #define MMF_DUMP_FILTER_MASK \
409 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
410 #define MMF_DUMP_FILTER_DEFAULT \
411 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
412 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
414 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
415 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
417 # define MMF_DUMP_MASK_DEFAULT_ELF 0
420 struct sighand_struct {
422 struct k_sigaction action[_NSIG];
424 wait_queue_head_t signalfd_wqh;
427 struct pacct_struct {
430 unsigned long ac_mem;
431 cputime_t ac_utime, ac_stime;
432 unsigned long ac_minflt, ac_majflt;
436 * struct task_cputime - collected CPU time counts
437 * @utime: time spent in user mode, in &cputime_t units
438 * @stime: time spent in kernel mode, in &cputime_t units
439 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
441 * This structure groups together three kinds of CPU time that are
442 * tracked for threads and thread groups. Most things considering
443 * CPU time want to group these counts together and treat all three
444 * of them in parallel.
446 struct task_cputime {
449 unsigned long long sum_exec_runtime;
451 /* Alternate field names when used to cache expirations. */
452 #define prof_exp stime
453 #define virt_exp utime
454 #define sched_exp sum_exec_runtime
457 * struct thread_group_cputime - thread group interval timer counts
458 * @totals: thread group interval timers; substructure for
459 * uniprocessor kernel, per-cpu for SMP kernel.
461 * This structure contains the version of task_cputime, above, that is
462 * used for thread group CPU clock calculations.
464 struct thread_group_cputime {
465 struct task_cputime *totals;
469 * NOTE! "signal_struct" does not have it's own
470 * locking, because a shared signal_struct always
471 * implies a shared sighand_struct, so locking
472 * sighand_struct is always a proper superset of
473 * the locking of signal_struct.
475 struct signal_struct {
479 wait_queue_head_t wait_chldexit; /* for wait4() */
481 /* current thread group signal load-balancing target: */
482 struct task_struct *curr_target;
484 /* shared signal handling: */
485 struct sigpending shared_pending;
487 /* thread group exit support */
490 * - notify group_exit_task when ->count is equal to notify_count
491 * - everyone except group_exit_task is stopped during signal delivery
492 * of fatal signals, group_exit_task processes the signal.
495 struct task_struct *group_exit_task;
497 /* thread group stop support, overloads group_exit_code too */
498 int group_stop_count;
499 unsigned int flags; /* see SIGNAL_* flags below */
501 /* POSIX.1b Interval Timers */
502 struct list_head posix_timers;
504 /* ITIMER_REAL timer for the process */
505 struct hrtimer real_timer;
506 struct pid *leader_pid;
507 ktime_t it_real_incr;
509 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
510 cputime_t it_prof_expires, it_virt_expires;
511 cputime_t it_prof_incr, it_virt_incr;
514 * Thread group totals for process CPU clocks.
515 * See thread_group_cputime(), et al, for details.
517 struct thread_group_cputime cputime;
519 /* Earliest-expiration cache. */
520 struct task_cputime cputime_expires;
522 struct list_head cpu_timers[3];
524 /* job control IDs */
527 * pgrp and session fields are deprecated.
528 * use the task_session_Xnr and task_pgrp_Xnr routines below
532 pid_t pgrp __deprecated;
536 struct pid *tty_old_pgrp;
539 pid_t session __deprecated;
543 /* boolean value for session group leader */
546 struct tty_struct *tty; /* NULL if no tty */
549 * Cumulative resource counters for dead threads in the group,
550 * and for reaped dead child processes forked by this group.
551 * Live threads maintain their own counters and add to these
552 * in __exit_signal, except for the group leader.
554 cputime_t cutime, cstime;
557 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
558 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
559 unsigned long inblock, oublock, cinblock, coublock;
560 struct task_io_accounting ioac;
563 * We don't bother to synchronize most readers of this at all,
564 * because there is no reader checking a limit that actually needs
565 * to get both rlim_cur and rlim_max atomically, and either one
566 * alone is a single word that can safely be read normally.
567 * getrlimit/setrlimit use task_lock(current->group_leader) to
568 * protect this instead of the siglock, because they really
569 * have no need to disable irqs.
571 struct rlimit rlim[RLIM_NLIMITS];
573 /* keep the process-shared keyrings here so that they do the right
574 * thing in threads created with CLONE_THREAD */
576 struct key *session_keyring; /* keyring inherited over fork */
577 struct key *process_keyring; /* keyring private to this process */
579 #ifdef CONFIG_BSD_PROCESS_ACCT
580 struct pacct_struct pacct; /* per-process accounting information */
582 #ifdef CONFIG_TASKSTATS
583 struct taskstats *stats;
587 struct tty_audit_buf *tty_audit_buf;
591 /* Context switch must be unlocked if interrupts are to be enabled */
592 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
593 # define __ARCH_WANT_UNLOCKED_CTXSW
597 * Bits in flags field of signal_struct.
599 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
600 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
601 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
602 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
604 * Pending notifications to parent.
606 #define SIGNAL_CLD_STOPPED 0x00000010
607 #define SIGNAL_CLD_CONTINUED 0x00000020
608 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
610 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
612 /* If true, all threads except ->group_exit_task have pending SIGKILL */
613 static inline int signal_group_exit(const struct signal_struct *sig)
615 return (sig->flags & SIGNAL_GROUP_EXIT) ||
616 (sig->group_exit_task != NULL);
620 * Some day this will be a full-fledged user tracking system..
623 atomic_t __count; /* reference count */
624 atomic_t processes; /* How many processes does this user have? */
625 atomic_t files; /* How many open files does this user have? */
626 atomic_t sigpending; /* How many pending signals does this user have? */
627 #ifdef CONFIG_INOTIFY_USER
628 atomic_t inotify_watches; /* How many inotify watches does this user have? */
629 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
631 #ifdef CONFIG_POSIX_MQUEUE
632 /* protected by mq_lock */
633 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
635 unsigned long locked_shm; /* How many pages of mlocked shm ? */
638 struct key *uid_keyring; /* UID specific keyring */
639 struct key *session_keyring; /* UID's default session keyring */
642 /* Hash table maintenance information */
643 struct hlist_node uidhash_node;
646 #ifdef CONFIG_USER_SCHED
647 struct task_group *tg;
650 struct work_struct work;
655 extern int uids_sysfs_init(void);
657 extern struct user_struct *find_user(uid_t);
659 extern struct user_struct root_user;
660 #define INIT_USER (&root_user)
662 struct backing_dev_info;
663 struct reclaim_state;
665 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
667 /* cumulative counters */
668 unsigned long pcount; /* # of times run on this cpu */
669 unsigned long long cpu_time, /* time spent on the cpu */
670 run_delay; /* time spent waiting on a runqueue */
673 unsigned long long last_arrival,/* when we last ran on a cpu */
674 last_queued; /* when we were last queued to run */
675 #ifdef CONFIG_SCHEDSTATS
677 unsigned int bkl_count;
680 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
682 #ifdef CONFIG_TASK_DELAY_ACCT
683 struct task_delay_info {
685 unsigned int flags; /* Private per-task flags */
687 /* For each stat XXX, add following, aligned appropriately
689 * struct timespec XXX_start, XXX_end;
693 * Atomicity of updates to XXX_delay, XXX_count protected by
694 * single lock above (split into XXX_lock if contention is an issue).
698 * XXX_count is incremented on every XXX operation, the delay
699 * associated with the operation is added to XXX_delay.
700 * XXX_delay contains the accumulated delay time in nanoseconds.
702 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
703 u64 blkio_delay; /* wait for sync block io completion */
704 u64 swapin_delay; /* wait for swapin block io completion */
705 u32 blkio_count; /* total count of the number of sync block */
706 /* io operations performed */
707 u32 swapin_count; /* total count of the number of swapin block */
708 /* io operations performed */
710 struct timespec freepages_start, freepages_end;
711 u64 freepages_delay; /* wait for memory reclaim */
712 u32 freepages_count; /* total count of memory reclaim */
714 #endif /* CONFIG_TASK_DELAY_ACCT */
716 static inline int sched_info_on(void)
718 #ifdef CONFIG_SCHEDSTATS
720 #elif defined(CONFIG_TASK_DELAY_ACCT)
721 extern int delayacct_on;
736 * sched-domains (multiprocessor balancing) declarations:
740 * Increase resolution of nice-level calculations:
742 #define SCHED_LOAD_SHIFT 10
743 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
745 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
748 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
749 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
750 #define SD_BALANCE_EXEC 4 /* Balance on exec */
751 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
752 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
753 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
754 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
755 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
756 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
757 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
758 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
759 #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
761 #define BALANCE_FOR_MC_POWER \
762 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
764 #define BALANCE_FOR_PKG_POWER \
765 ((sched_mc_power_savings || sched_smt_power_savings) ? \
766 SD_POWERSAVINGS_BALANCE : 0)
768 #define test_sd_parent(sd, flag) ((sd->parent && \
769 (sd->parent->flags & flag)) ? 1 : 0)
773 struct sched_group *next; /* Must be a circular list */
777 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
778 * single CPU. This is read only (except for setup, hotplug CPU).
779 * Note : Never change cpu_power without recompute its reciprocal
781 unsigned int __cpu_power;
783 * reciprocal value of cpu_power to avoid expensive divides
784 * (see include/linux/reciprocal_div.h)
786 u32 reciprocal_cpu_power;
789 enum sched_domain_level {
799 struct sched_domain_attr {
800 int relax_domain_level;
803 #define SD_ATTR_INIT (struct sched_domain_attr) { \
804 .relax_domain_level = -1, \
807 struct sched_domain {
808 /* These fields must be setup */
809 struct sched_domain *parent; /* top domain must be null terminated */
810 struct sched_domain *child; /* bottom domain must be null terminated */
811 struct sched_group *groups; /* the balancing groups of the domain */
812 cpumask_t span; /* span of all CPUs in this domain */
813 unsigned long min_interval; /* Minimum balance interval ms */
814 unsigned long max_interval; /* Maximum balance interval ms */
815 unsigned int busy_factor; /* less balancing by factor if busy */
816 unsigned int imbalance_pct; /* No balance until over watermark */
817 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
818 unsigned int busy_idx;
819 unsigned int idle_idx;
820 unsigned int newidle_idx;
821 unsigned int wake_idx;
822 unsigned int forkexec_idx;
823 int flags; /* See SD_* */
824 enum sched_domain_level level;
826 /* Runtime fields. */
827 unsigned long last_balance; /* init to jiffies. units in jiffies */
828 unsigned int balance_interval; /* initialise to 1. units in ms. */
829 unsigned int nr_balance_failed; /* initialise to 0 */
833 #ifdef CONFIG_SCHEDSTATS
834 /* load_balance() stats */
835 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
836 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
837 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
838 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
839 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
840 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
841 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
842 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
844 /* Active load balancing */
845 unsigned int alb_count;
846 unsigned int alb_failed;
847 unsigned int alb_pushed;
849 /* SD_BALANCE_EXEC stats */
850 unsigned int sbe_count;
851 unsigned int sbe_balanced;
852 unsigned int sbe_pushed;
854 /* SD_BALANCE_FORK stats */
855 unsigned int sbf_count;
856 unsigned int sbf_balanced;
857 unsigned int sbf_pushed;
859 /* try_to_wake_up() stats */
860 unsigned int ttwu_wake_remote;
861 unsigned int ttwu_move_affine;
862 unsigned int ttwu_move_balance;
864 #ifdef CONFIG_SCHED_DEBUG
869 extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
870 struct sched_domain_attr *dattr_new);
871 extern int arch_reinit_sched_domains(void);
873 #else /* CONFIG_SMP */
875 struct sched_domain_attr;
878 partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
879 struct sched_domain_attr *dattr_new)
882 #endif /* !CONFIG_SMP */
884 struct io_context; /* See blkdev.h */
885 #define NGROUPS_SMALL 32
886 #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
890 gid_t small_block[NGROUPS_SMALL];
896 * get_group_info() must be called with the owning task locked (via task_lock())
897 * when task != current. The reason being that the vast majority of callers are
898 * looking at current->group_info, which can not be changed except by the
899 * current task. Changing current->group_info requires the task lock, too.
901 #define get_group_info(group_info) do { \
902 atomic_inc(&(group_info)->usage); \
905 #define put_group_info(group_info) do { \
906 if (atomic_dec_and_test(&(group_info)->usage)) \
907 groups_free(group_info); \
910 extern struct group_info *groups_alloc(int gidsetsize);
911 extern void groups_free(struct group_info *group_info);
912 extern int set_current_groups(struct group_info *group_info);
913 extern int groups_search(struct group_info *group_info, gid_t grp);
914 /* access the groups "array" with this macro */
915 #define GROUP_AT(gi, i) \
916 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
918 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
919 extern void prefetch_stack(struct task_struct *t);
921 static inline void prefetch_stack(struct task_struct *t) { }
924 struct audit_context; /* See audit.c */
926 struct pipe_inode_info;
927 struct uts_namespace;
933 const struct sched_class *next;
935 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
936 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
937 void (*yield_task) (struct rq *rq);
939 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
941 struct task_struct * (*pick_next_task) (struct rq *rq);
942 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
945 int (*select_task_rq)(struct task_struct *p, int sync);
947 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
948 struct rq *busiest, unsigned long max_load_move,
949 struct sched_domain *sd, enum cpu_idle_type idle,
950 int *all_pinned, int *this_best_prio);
952 int (*move_one_task) (struct rq *this_rq, int this_cpu,
953 struct rq *busiest, struct sched_domain *sd,
954 enum cpu_idle_type idle);
955 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
956 void (*post_schedule) (struct rq *this_rq);
957 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
959 void (*set_cpus_allowed)(struct task_struct *p,
960 const cpumask_t *newmask);
962 void (*rq_online)(struct rq *rq);
963 void (*rq_offline)(struct rq *rq);
966 void (*set_curr_task) (struct rq *rq);
967 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
968 void (*task_new) (struct rq *rq, struct task_struct *p);
970 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
972 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
974 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
975 int oldprio, int running);
977 #ifdef CONFIG_FAIR_GROUP_SCHED
978 void (*moved_group) (struct task_struct *p);
983 unsigned long weight, inv_weight;
987 * CFS stats for a schedulable entity (task, task-group etc)
989 * Current field usage histogram:
996 struct sched_entity {
997 struct load_weight load; /* for load-balancing */
998 struct rb_node run_node;
999 struct list_head group_node;
1003 u64 sum_exec_runtime;
1005 u64 prev_sum_exec_runtime;
1010 #ifdef CONFIG_SCHEDSTATS
1018 s64 sum_sleep_runtime;
1026 u64 nr_migrations_cold;
1027 u64 nr_failed_migrations_affine;
1028 u64 nr_failed_migrations_running;
1029 u64 nr_failed_migrations_hot;
1030 u64 nr_forced_migrations;
1031 u64 nr_forced2_migrations;
1034 u64 nr_wakeups_sync;
1035 u64 nr_wakeups_migrate;
1036 u64 nr_wakeups_local;
1037 u64 nr_wakeups_remote;
1038 u64 nr_wakeups_affine;
1039 u64 nr_wakeups_affine_attempts;
1040 u64 nr_wakeups_passive;
1041 u64 nr_wakeups_idle;
1044 #ifdef CONFIG_FAIR_GROUP_SCHED
1045 struct sched_entity *parent;
1046 /* rq on which this entity is (to be) queued: */
1047 struct cfs_rq *cfs_rq;
1048 /* rq "owned" by this entity/group: */
1049 struct cfs_rq *my_q;
1053 struct sched_rt_entity {
1054 struct list_head run_list;
1055 unsigned long timeout;
1056 unsigned int time_slice;
1057 int nr_cpus_allowed;
1059 struct sched_rt_entity *back;
1060 #ifdef CONFIG_RT_GROUP_SCHED
1061 struct sched_rt_entity *parent;
1062 /* rq on which this entity is (to be) queued: */
1063 struct rt_rq *rt_rq;
1064 /* rq "owned" by this entity/group: */
1069 struct task_struct {
1070 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1073 unsigned int flags; /* per process flags, defined below */
1074 unsigned int ptrace;
1076 int lock_depth; /* BKL lock depth */
1079 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1084 int prio, static_prio, normal_prio;
1085 unsigned int rt_priority;
1086 const struct sched_class *sched_class;
1087 struct sched_entity se;
1088 struct sched_rt_entity rt;
1090 #ifdef CONFIG_PREEMPT_NOTIFIERS
1091 /* list of struct preempt_notifier: */
1092 struct hlist_head preempt_notifiers;
1096 * fpu_counter contains the number of consecutive context switches
1097 * that the FPU is used. If this is over a threshold, the lazy fpu
1098 * saving becomes unlazy to save the trap. This is an unsigned char
1099 * so that after 256 times the counter wraps and the behavior turns
1100 * lazy again; this to deal with bursty apps that only use FPU for
1103 unsigned char fpu_counter;
1104 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
1105 #ifdef CONFIG_BLK_DEV_IO_TRACE
1106 unsigned int btrace_seq;
1109 unsigned int policy;
1110 cpumask_t cpus_allowed;
1112 #ifdef CONFIG_PREEMPT_RCU
1113 int rcu_read_lock_nesting;
1114 int rcu_flipctr_idx;
1115 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1117 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1118 struct sched_info sched_info;
1121 struct list_head tasks;
1123 struct mm_struct *mm, *active_mm;
1126 struct linux_binfmt *binfmt;
1128 int exit_code, exit_signal;
1129 int pdeath_signal; /* The signal sent when the parent dies */
1131 unsigned int personality;
1132 unsigned did_exec:1;
1136 #ifdef CONFIG_CC_STACKPROTECTOR
1137 /* Canary value for the -fstack-protector gcc feature */
1138 unsigned long stack_canary;
1141 * pointers to (original) parent process, youngest child, younger sibling,
1142 * older sibling, respectively. (p->father can be replaced with
1143 * p->real_parent->pid)
1145 struct task_struct *real_parent; /* real parent process */
1146 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1148 * children/sibling forms the list of my natural children
1150 struct list_head children; /* list of my children */
1151 struct list_head sibling; /* linkage in my parent's children list */
1152 struct task_struct *group_leader; /* threadgroup leader */
1155 * ptraced is the list of tasks this task is using ptrace on.
1156 * This includes both natural children and PTRACE_ATTACH targets.
1157 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1159 struct list_head ptraced;
1160 struct list_head ptrace_entry;
1162 /* PID/PID hash table linkage. */
1163 struct pid_link pids[PIDTYPE_MAX];
1164 struct list_head thread_group;
1166 struct completion *vfork_done; /* for vfork() */
1167 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1168 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1170 cputime_t utime, stime, utimescaled, stimescaled;
1172 cputime_t prev_utime, prev_stime;
1173 unsigned long nvcsw, nivcsw; /* context switch counts */
1174 struct timespec start_time; /* monotonic time */
1175 struct timespec real_start_time; /* boot based time */
1176 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1177 unsigned long min_flt, maj_flt;
1179 struct task_cputime cputime_expires;
1180 struct list_head cpu_timers[3];
1182 /* process credentials */
1183 uid_t uid,euid,suid,fsuid;
1184 gid_t gid,egid,sgid,fsgid;
1185 struct group_info *group_info;
1186 kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset;
1187 struct user_struct *user;
1188 unsigned securebits;
1190 unsigned char jit_keyring; /* default keyring to attach requested keys to */
1191 struct key *request_key_auth; /* assumed request_key authority */
1192 struct key *thread_keyring; /* keyring private to this thread */
1194 char comm[TASK_COMM_LEN]; /* executable name excluding path
1195 - access with [gs]et_task_comm (which lock
1196 it with task_lock())
1197 - initialized normally by flush_old_exec */
1198 /* file system info */
1199 int link_count, total_link_count;
1200 #ifdef CONFIG_SYSVIPC
1202 struct sysv_sem sysvsem;
1204 #ifdef CONFIG_DETECT_SOFTLOCKUP
1205 /* hung task detection */
1206 unsigned long last_switch_timestamp;
1207 unsigned long last_switch_count;
1209 /* CPU-specific state of this task */
1210 struct thread_struct thread;
1211 /* filesystem information */
1212 struct fs_struct *fs;
1213 /* open file information */
1214 struct files_struct *files;
1216 struct nsproxy *nsproxy;
1217 /* signal handlers */
1218 struct signal_struct *signal;
1219 struct sighand_struct *sighand;
1221 sigset_t blocked, real_blocked;
1222 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1223 struct sigpending pending;
1225 unsigned long sas_ss_sp;
1227 int (*notifier)(void *priv);
1228 void *notifier_data;
1229 sigset_t *notifier_mask;
1230 #ifdef CONFIG_SECURITY
1233 struct audit_context *audit_context;
1234 #ifdef CONFIG_AUDITSYSCALL
1236 unsigned int sessionid;
1240 /* Thread group tracking */
1243 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1244 spinlock_t alloc_lock;
1246 /* Protection of the PI data structures: */
1249 #ifdef CONFIG_RT_MUTEXES
1250 /* PI waiters blocked on a rt_mutex held by this task */
1251 struct plist_head pi_waiters;
1252 /* Deadlock detection and priority inheritance handling */
1253 struct rt_mutex_waiter *pi_blocked_on;
1256 #ifdef CONFIG_DEBUG_MUTEXES
1257 /* mutex deadlock detection */
1258 struct mutex_waiter *blocked_on;
1260 #ifdef CONFIG_TRACE_IRQFLAGS
1261 unsigned int irq_events;
1262 int hardirqs_enabled;
1263 unsigned long hardirq_enable_ip;
1264 unsigned int hardirq_enable_event;
1265 unsigned long hardirq_disable_ip;
1266 unsigned int hardirq_disable_event;
1267 int softirqs_enabled;
1268 unsigned long softirq_disable_ip;
1269 unsigned int softirq_disable_event;
1270 unsigned long softirq_enable_ip;
1271 unsigned int softirq_enable_event;
1272 int hardirq_context;
1273 int softirq_context;
1275 #ifdef CONFIG_LOCKDEP
1276 # define MAX_LOCK_DEPTH 48UL
1279 unsigned int lockdep_recursion;
1280 struct held_lock held_locks[MAX_LOCK_DEPTH];
1283 /* journalling filesystem info */
1286 /* stacked block device info */
1287 struct bio *bio_list, **bio_tail;
1290 struct reclaim_state *reclaim_state;
1292 struct backing_dev_info *backing_dev_info;
1294 struct io_context *io_context;
1296 unsigned long ptrace_message;
1297 siginfo_t *last_siginfo; /* For ptrace use. */
1298 struct task_io_accounting ioac;
1299 #if defined(CONFIG_TASK_XACCT)
1300 u64 acct_rss_mem1; /* accumulated rss usage */
1301 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1302 cputime_t acct_timexpd; /* stime + utime since last update */
1304 #ifdef CONFIG_CPUSETS
1305 nodemask_t mems_allowed;
1306 int cpuset_mems_generation;
1307 int cpuset_mem_spread_rotor;
1309 #ifdef CONFIG_CGROUPS
1310 /* Control Group info protected by css_set_lock */
1311 struct css_set *cgroups;
1312 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1313 struct list_head cg_list;
1316 struct robust_list_head __user *robust_list;
1317 #ifdef CONFIG_COMPAT
1318 struct compat_robust_list_head __user *compat_robust_list;
1320 struct list_head pi_state_list;
1321 struct futex_pi_state *pi_state_cache;
1324 struct mempolicy *mempolicy;
1327 atomic_t fs_excl; /* holding fs exclusive resources */
1328 struct rcu_head rcu;
1331 * cache last used pipe for splice
1333 struct pipe_inode_info *splice_pipe;
1334 #ifdef CONFIG_TASK_DELAY_ACCT
1335 struct task_delay_info *delays;
1337 #ifdef CONFIG_FAULT_INJECTION
1340 struct prop_local_single dirties;
1341 #ifdef CONFIG_LATENCYTOP
1342 int latency_record_count;
1343 struct latency_record latency_record[LT_SAVECOUNT];
1346 * time slack values; these are used to round up poll() and
1347 * select() etc timeout values. These are in nanoseconds.
1349 unsigned long timer_slack_ns;
1350 unsigned long default_timer_slack_ns;
1352 struct list_head *scm_work_list;
1356 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1357 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1358 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1359 * values are inverted: lower p->prio value means higher priority.
1361 * The MAX_USER_RT_PRIO value allows the actual maximum
1362 * RT priority to be separate from the value exported to
1363 * user-space. This allows kernel threads to set their
1364 * priority to a value higher than any user task. Note:
1365 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1368 #define MAX_USER_RT_PRIO 100
1369 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1371 #define MAX_PRIO (MAX_RT_PRIO + 40)
1372 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1374 static inline int rt_prio(int prio)
1376 if (unlikely(prio < MAX_RT_PRIO))
1381 static inline int rt_task(struct task_struct *p)
1383 return rt_prio(p->prio);
1386 static inline void set_task_session(struct task_struct *tsk, pid_t session)
1388 tsk->signal->__session = session;
1391 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1393 tsk->signal->__pgrp = pgrp;
1396 static inline struct pid *task_pid(struct task_struct *task)
1398 return task->pids[PIDTYPE_PID].pid;
1401 static inline struct pid *task_tgid(struct task_struct *task)
1403 return task->group_leader->pids[PIDTYPE_PID].pid;
1406 static inline struct pid *task_pgrp(struct task_struct *task)
1408 return task->group_leader->pids[PIDTYPE_PGID].pid;
1411 static inline struct pid *task_session(struct task_struct *task)
1413 return task->group_leader->pids[PIDTYPE_SID].pid;
1416 struct pid_namespace;
1419 * the helpers to get the task's different pids as they are seen
1420 * from various namespaces
1422 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1423 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1425 * task_xid_nr_ns() : id seen from the ns specified;
1427 * set_task_vxid() : assigns a virtual id to a task;
1429 * see also pid_nr() etc in include/linux/pid.h
1432 static inline pid_t task_pid_nr(struct task_struct *tsk)
1437 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1439 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1441 return pid_vnr(task_pid(tsk));
1445 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1450 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1452 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1454 return pid_vnr(task_tgid(tsk));
1458 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1460 return tsk->signal->__pgrp;
1463 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1465 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1467 return pid_vnr(task_pgrp(tsk));
1471 static inline pid_t task_session_nr(struct task_struct *tsk)
1473 return tsk->signal->__session;
1476 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1478 static inline pid_t task_session_vnr(struct task_struct *tsk)
1480 return pid_vnr(task_session(tsk));
1485 * pid_alive - check that a task structure is not stale
1486 * @p: Task structure to be checked.
1488 * Test if a process is not yet dead (at most zombie state)
1489 * If pid_alive fails, then pointers within the task structure
1490 * can be stale and must not be dereferenced.
1492 static inline int pid_alive(struct task_struct *p)
1494 return p->pids[PIDTYPE_PID].pid != NULL;
1498 * is_global_init - check if a task structure is init
1499 * @tsk: Task structure to be checked.
1501 * Check if a task structure is the first user space task the kernel created.
1503 static inline int is_global_init(struct task_struct *tsk)
1505 return tsk->pid == 1;
1509 * is_container_init:
1510 * check whether in the task is init in its own pid namespace.
1512 extern int is_container_init(struct task_struct *tsk);
1514 extern struct pid *cad_pid;
1516 extern void free_task(struct task_struct *tsk);
1517 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1519 extern void __put_task_struct(struct task_struct *t);
1521 static inline void put_task_struct(struct task_struct *t)
1523 if (atomic_dec_and_test(&t->usage))
1524 __put_task_struct(t);
1527 extern cputime_t task_utime(struct task_struct *p);
1528 extern cputime_t task_stime(struct task_struct *p);
1529 extern cputime_t task_gtime(struct task_struct *p);
1534 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1535 /* Not implemented yet, only for 486*/
1536 #define PF_STARTING 0x00000002 /* being created */
1537 #define PF_EXITING 0x00000004 /* getting shut down */
1538 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1539 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1540 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1541 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1542 #define PF_DUMPCORE 0x00000200 /* dumped core */
1543 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1544 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1545 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1546 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1547 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1548 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1549 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1550 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1551 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1552 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1553 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1554 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1555 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1556 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1557 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1558 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1559 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1560 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1561 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1562 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1565 * Only the _current_ task can read/write to tsk->flags, but other
1566 * tasks can access tsk->flags in readonly mode for example
1567 * with tsk_used_math (like during threaded core dumping).
1568 * There is however an exception to this rule during ptrace
1569 * or during fork: the ptracer task is allowed to write to the
1570 * child->flags of its traced child (same goes for fork, the parent
1571 * can write to the child->flags), because we're guaranteed the
1572 * child is not running and in turn not changing child->flags
1573 * at the same time the parent does it.
1575 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1576 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1577 #define clear_used_math() clear_stopped_child_used_math(current)
1578 #define set_used_math() set_stopped_child_used_math(current)
1579 #define conditional_stopped_child_used_math(condition, child) \
1580 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1581 #define conditional_used_math(condition) \
1582 conditional_stopped_child_used_math(condition, current)
1583 #define copy_to_stopped_child_used_math(child) \
1584 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1585 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1586 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1587 #define used_math() tsk_used_math(current)
1590 extern int set_cpus_allowed_ptr(struct task_struct *p,
1591 const cpumask_t *new_mask);
1593 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1594 const cpumask_t *new_mask)
1596 if (!cpu_isset(0, *new_mask))
1601 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1603 return set_cpus_allowed_ptr(p, &new_mask);
1606 extern unsigned long long sched_clock(void);
1608 extern void sched_clock_init(void);
1609 extern u64 sched_clock_cpu(int cpu);
1611 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1612 static inline void sched_clock_tick(void)
1616 static inline void sched_clock_idle_sleep_event(void)
1620 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1624 extern void sched_clock_tick(void);
1625 extern void sched_clock_idle_sleep_event(void);
1626 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1630 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1631 * clock constructed from sched_clock():
1633 extern unsigned long long cpu_clock(int cpu);
1635 extern unsigned long long
1636 task_sched_runtime(struct task_struct *task);
1637 extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1639 /* sched_exec is called by processes performing an exec */
1641 extern void sched_exec(void);
1643 #define sched_exec() {}
1646 extern void sched_clock_idle_sleep_event(void);
1647 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1649 #ifdef CONFIG_HOTPLUG_CPU
1650 extern void idle_task_exit(void);
1652 static inline void idle_task_exit(void) {}
1655 extern void sched_idle_next(void);
1657 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1658 extern void wake_up_idle_cpu(int cpu);
1660 static inline void wake_up_idle_cpu(int cpu) { }
1663 #ifdef CONFIG_SCHED_DEBUG
1664 extern unsigned int sysctl_sched_latency;
1665 extern unsigned int sysctl_sched_min_granularity;
1666 extern unsigned int sysctl_sched_wakeup_granularity;
1667 extern unsigned int sysctl_sched_child_runs_first;
1668 extern unsigned int sysctl_sched_features;
1669 extern unsigned int sysctl_sched_migration_cost;
1670 extern unsigned int sysctl_sched_nr_migrate;
1671 extern unsigned int sysctl_sched_shares_ratelimit;
1672 extern unsigned int sysctl_sched_shares_thresh;
1674 int sched_nr_latency_handler(struct ctl_table *table, int write,
1675 struct file *file, void __user *buffer, size_t *length,
1678 extern unsigned int sysctl_sched_rt_period;
1679 extern int sysctl_sched_rt_runtime;
1681 int sched_rt_handler(struct ctl_table *table, int write,
1682 struct file *filp, void __user *buffer, size_t *lenp,
1685 extern unsigned int sysctl_sched_compat_yield;
1687 #ifdef CONFIG_RT_MUTEXES
1688 extern int rt_mutex_getprio(struct task_struct *p);
1689 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1690 extern void rt_mutex_adjust_pi(struct task_struct *p);
1692 static inline int rt_mutex_getprio(struct task_struct *p)
1694 return p->normal_prio;
1696 # define rt_mutex_adjust_pi(p) do { } while (0)
1699 extern void set_user_nice(struct task_struct *p, long nice);
1700 extern int task_prio(const struct task_struct *p);
1701 extern int task_nice(const struct task_struct *p);
1702 extern int can_nice(const struct task_struct *p, const int nice);
1703 extern int task_curr(const struct task_struct *p);
1704 extern int idle_cpu(int cpu);
1705 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1706 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1707 struct sched_param *);
1708 extern struct task_struct *idle_task(int cpu);
1709 extern struct task_struct *curr_task(int cpu);
1710 extern void set_curr_task(int cpu, struct task_struct *p);
1715 * The default (Linux) execution domain.
1717 extern struct exec_domain default_exec_domain;
1719 union thread_union {
1720 struct thread_info thread_info;
1721 unsigned long stack[THREAD_SIZE/sizeof(long)];
1724 #ifndef __HAVE_ARCH_KSTACK_END
1725 static inline int kstack_end(void *addr)
1727 /* Reliable end of stack detection:
1728 * Some APM bios versions misalign the stack
1730 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1734 extern union thread_union init_thread_union;
1735 extern struct task_struct init_task;
1737 extern struct mm_struct init_mm;
1739 extern struct pid_namespace init_pid_ns;
1742 * find a task by one of its numerical ids
1744 * find_task_by_pid_type_ns():
1745 * it is the most generic call - it finds a task by all id,
1746 * type and namespace specified
1747 * find_task_by_pid_ns():
1748 * finds a task by its pid in the specified namespace
1749 * find_task_by_vpid():
1750 * finds a task by its virtual pid
1752 * see also find_vpid() etc in include/linux/pid.h
1755 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1756 struct pid_namespace *ns);
1758 extern struct task_struct *find_task_by_vpid(pid_t nr);
1759 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1760 struct pid_namespace *ns);
1762 extern void __set_special_pids(struct pid *pid);
1764 /* per-UID process charging. */
1765 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1766 static inline struct user_struct *get_uid(struct user_struct *u)
1768 atomic_inc(&u->__count);
1771 extern void free_uid(struct user_struct *);
1772 extern void switch_uid(struct user_struct *);
1773 extern void release_uids(struct user_namespace *ns);
1775 #include <asm/current.h>
1777 extern void do_timer(unsigned long ticks);
1779 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1780 extern int wake_up_process(struct task_struct *tsk);
1781 extern void wake_up_new_task(struct task_struct *tsk,
1782 unsigned long clone_flags);
1784 extern void kick_process(struct task_struct *tsk);
1786 static inline void kick_process(struct task_struct *tsk) { }
1788 extern void sched_fork(struct task_struct *p, int clone_flags);
1789 extern void sched_dead(struct task_struct *p);
1791 extern int in_group_p(gid_t);
1792 extern int in_egroup_p(gid_t);
1794 extern void proc_caches_init(void);
1795 extern void flush_signals(struct task_struct *);
1796 extern void ignore_signals(struct task_struct *);
1797 extern void flush_signal_handlers(struct task_struct *, int force_default);
1798 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1800 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1802 unsigned long flags;
1805 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1806 ret = dequeue_signal(tsk, mask, info);
1807 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1812 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1814 extern void unblock_all_signals(void);
1815 extern void release_task(struct task_struct * p);
1816 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1817 extern int force_sigsegv(int, struct task_struct *);
1818 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1819 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1820 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1821 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1822 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1823 extern int kill_pid(struct pid *pid, int sig, int priv);
1824 extern int kill_proc_info(int, struct siginfo *, pid_t);
1825 extern int do_notify_parent(struct task_struct *, int);
1826 extern void force_sig(int, struct task_struct *);
1827 extern void force_sig_specific(int, struct task_struct *);
1828 extern int send_sig(int, struct task_struct *, int);
1829 extern void zap_other_threads(struct task_struct *p);
1830 extern struct sigqueue *sigqueue_alloc(void);
1831 extern void sigqueue_free(struct sigqueue *);
1832 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
1833 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1834 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1836 static inline int kill_cad_pid(int sig, int priv)
1838 return kill_pid(cad_pid, sig, priv);
1841 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1842 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1843 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1844 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1846 static inline int is_si_special(const struct siginfo *info)
1848 return info <= SEND_SIG_FORCED;
1851 /* True if we are on the alternate signal stack. */
1853 static inline int on_sig_stack(unsigned long sp)
1855 return (sp - current->sas_ss_sp < current->sas_ss_size);
1858 static inline int sas_ss_flags(unsigned long sp)
1860 return (current->sas_ss_size == 0 ? SS_DISABLE
1861 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1865 * Routines for handling mm_structs
1867 extern struct mm_struct * mm_alloc(void);
1869 /* mmdrop drops the mm and the page tables */
1870 extern void __mmdrop(struct mm_struct *);
1871 static inline void mmdrop(struct mm_struct * mm)
1873 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1877 /* mmput gets rid of the mappings and all user-space */
1878 extern void mmput(struct mm_struct *);
1879 /* Grab a reference to a task's mm, if it is not already going away */
1880 extern struct mm_struct *get_task_mm(struct task_struct *task);
1881 /* Remove the current tasks stale references to the old mm_struct */
1882 extern void mm_release(struct task_struct *, struct mm_struct *);
1883 /* Allocate a new mm structure and copy contents from tsk->mm */
1884 extern struct mm_struct *dup_mm(struct task_struct *tsk);
1886 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1887 extern void flush_thread(void);
1888 extern void exit_thread(void);
1890 extern void exit_files(struct task_struct *);
1891 extern void __cleanup_signal(struct signal_struct *);
1892 extern void __cleanup_sighand(struct sighand_struct *);
1894 extern void exit_itimers(struct signal_struct *);
1895 extern void flush_itimer_signals(void);
1897 extern NORET_TYPE void do_group_exit(int);
1899 extern void daemonize(const char *, ...);
1900 extern int allow_signal(int);
1901 extern int disallow_signal(int);
1903 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1904 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1905 struct task_struct *fork_idle(int);
1907 extern void set_task_comm(struct task_struct *tsk, char *from);
1908 extern char *get_task_comm(char *to, struct task_struct *tsk);
1911 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
1913 static inline unsigned long wait_task_inactive(struct task_struct *p,
1920 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1922 #define for_each_process(p) \
1923 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1926 * Careful: do_each_thread/while_each_thread is a double loop so
1927 * 'break' will not work as expected - use goto instead.
1929 #define do_each_thread(g, t) \
1930 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1932 #define while_each_thread(g, t) \
1933 while ((t = next_thread(t)) != g)
1935 /* de_thread depends on thread_group_leader not being a pid based check */
1936 #define thread_group_leader(p) (p == p->group_leader)
1938 /* Do to the insanities of de_thread it is possible for a process
1939 * to have the pid of the thread group leader without actually being
1940 * the thread group leader. For iteration through the pids in proc
1941 * all we care about is that we have a task with the appropriate
1942 * pid, we don't actually care if we have the right task.
1944 static inline int has_group_leader_pid(struct task_struct *p)
1946 return p->pid == p->tgid;
1950 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1952 return p1->tgid == p2->tgid;
1955 static inline struct task_struct *next_thread(const struct task_struct *p)
1957 return list_entry(rcu_dereference(p->thread_group.next),
1958 struct task_struct, thread_group);
1961 static inline int thread_group_empty(struct task_struct *p)
1963 return list_empty(&p->thread_group);
1966 #define delay_group_leader(p) \
1967 (thread_group_leader(p) && !thread_group_empty(p))
1970 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1971 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1972 * pins the final release of task.io_context. Also protects ->cpuset and
1973 * ->cgroup.subsys[].
1975 * Nests both inside and outside of read_lock(&tasklist_lock).
1976 * It must not be nested with write_lock_irq(&tasklist_lock),
1977 * neither inside nor outside.
1979 static inline void task_lock(struct task_struct *p)
1981 spin_lock(&p->alloc_lock);
1984 static inline void task_unlock(struct task_struct *p)
1986 spin_unlock(&p->alloc_lock);
1989 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1990 unsigned long *flags);
1992 static inline void unlock_task_sighand(struct task_struct *tsk,
1993 unsigned long *flags)
1995 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1998 #ifndef __HAVE_THREAD_FUNCTIONS
2000 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2001 #define task_stack_page(task) ((task)->stack)
2003 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2005 *task_thread_info(p) = *task_thread_info(org);
2006 task_thread_info(p)->task = p;
2009 static inline unsigned long *end_of_stack(struct task_struct *p)
2011 return (unsigned long *)(task_thread_info(p) + 1);
2016 static inline int object_is_on_stack(void *obj)
2018 void *stack = task_stack_page(current);
2020 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2023 extern void thread_info_cache_init(void);
2025 /* set thread flags in other task's structures
2026 * - see asm/thread_info.h for TIF_xxxx flags available
2028 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2030 set_ti_thread_flag(task_thread_info(tsk), flag);
2033 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2035 clear_ti_thread_flag(task_thread_info(tsk), flag);
2038 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2040 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2043 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2045 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2048 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2050 return test_ti_thread_flag(task_thread_info(tsk), flag);
2053 static inline void set_tsk_need_resched(struct task_struct *tsk)
2055 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2058 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2060 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2063 static inline int test_tsk_need_resched(struct task_struct *tsk)
2065 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2068 static inline int signal_pending(struct task_struct *p)
2070 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2073 extern int __fatal_signal_pending(struct task_struct *p);
2075 static inline int fatal_signal_pending(struct task_struct *p)
2077 return signal_pending(p) && __fatal_signal_pending(p);
2080 static inline int signal_pending_state(long state, struct task_struct *p)
2082 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2084 if (!signal_pending(p))
2087 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2090 static inline int need_resched(void)
2092 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2096 * cond_resched() and cond_resched_lock(): latency reduction via
2097 * explicit rescheduling in places that are safe. The return
2098 * value indicates whether a reschedule was done in fact.
2099 * cond_resched_lock() will drop the spinlock before scheduling,
2100 * cond_resched_softirq() will enable bhs before scheduling.
2102 extern int _cond_resched(void);
2103 #ifdef CONFIG_PREEMPT_BKL
2104 static inline int cond_resched(void)
2109 static inline int cond_resched(void)
2111 return _cond_resched();
2114 extern int cond_resched_lock(spinlock_t * lock);
2115 extern int cond_resched_softirq(void);
2116 static inline int cond_resched_bkl(void)
2118 return _cond_resched();
2122 * Does a critical section need to be broken due to another
2123 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2124 * but a general need for low latency)
2126 static inline int spin_needbreak(spinlock_t *lock)
2128 #ifdef CONFIG_PREEMPT
2129 return spin_is_contended(lock);
2136 * Thread group CPU time accounting.
2139 extern int thread_group_cputime_alloc(struct task_struct *);
2140 extern void thread_group_cputime(struct task_struct *, struct task_cputime *);
2142 static inline void thread_group_cputime_init(struct signal_struct *sig)
2144 sig->cputime.totals = NULL;
2147 static inline int thread_group_cputime_clone_thread(struct task_struct *curr)
2149 if (curr->signal->cputime.totals)
2151 return thread_group_cputime_alloc(curr);
2154 static inline void thread_group_cputime_free(struct signal_struct *sig)
2156 free_percpu(sig->cputime.totals);
2160 * Reevaluate whether the task has signals pending delivery.
2161 * Wake the task if so.
2162 * This is required every time the blocked sigset_t changes.
2163 * callers must hold sighand->siglock.
2165 extern void recalc_sigpending_and_wake(struct task_struct *t);
2166 extern void recalc_sigpending(void);
2168 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2171 * Wrappers for p->thread_info->cpu access. No-op on UP.
2175 static inline unsigned int task_cpu(const struct task_struct *p)
2177 return task_thread_info(p)->cpu;
2180 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2184 static inline unsigned int task_cpu(const struct task_struct *p)
2189 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2193 #endif /* CONFIG_SMP */
2195 extern void arch_pick_mmap_layout(struct mm_struct *mm);
2197 #ifdef CONFIG_TRACING
2199 __trace_special(void *__tr, void *__data,
2200 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2203 __trace_special(void *__tr, void *__data,
2204 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2209 extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
2210 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
2212 extern int sched_mc_power_savings, sched_smt_power_savings;
2214 extern void normalize_rt_tasks(void);
2216 #ifdef CONFIG_GROUP_SCHED
2218 extern struct task_group init_task_group;
2219 #ifdef CONFIG_USER_SCHED
2220 extern struct task_group root_task_group;
2223 extern struct task_group *sched_create_group(struct task_group *parent);
2224 extern void sched_destroy_group(struct task_group *tg);
2225 extern void sched_move_task(struct task_struct *tsk);
2226 #ifdef CONFIG_FAIR_GROUP_SCHED
2227 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2228 extern unsigned long sched_group_shares(struct task_group *tg);
2230 #ifdef CONFIG_RT_GROUP_SCHED
2231 extern int sched_group_set_rt_runtime(struct task_group *tg,
2232 long rt_runtime_us);
2233 extern long sched_group_rt_runtime(struct task_group *tg);
2234 extern int sched_group_set_rt_period(struct task_group *tg,
2236 extern long sched_group_rt_period(struct task_group *tg);
2240 #ifdef CONFIG_TASK_XACCT
2241 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2243 tsk->ioac.rchar += amt;
2246 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2248 tsk->ioac.wchar += amt;
2251 static inline void inc_syscr(struct task_struct *tsk)
2256 static inline void inc_syscw(struct task_struct *tsk)
2261 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2265 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2269 static inline void inc_syscr(struct task_struct *tsk)
2273 static inline void inc_syscw(struct task_struct *tsk)
2278 #ifndef TASK_SIZE_OF
2279 #define TASK_SIZE_OF(tsk) TASK_SIZE
2282 #ifdef CONFIG_MM_OWNER
2283 extern void mm_update_next_owner(struct mm_struct *mm);
2284 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2286 static inline void mm_update_next_owner(struct mm_struct *mm)
2290 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2293 #endif /* CONFIG_MM_OWNER */
2295 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2297 #endif /* __KERNEL__ */