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);
251 extern cpumask_t nohz_cpu_mask;
252 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
253 extern int select_nohz_load_balancer(int cpu);
255 static inline int select_nohz_load_balancer(int cpu)
261 extern unsigned long rt_needs_cpu(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);
290 extern void hrtick_resched(void);
292 extern void sched_show_task(struct task_struct *p);
294 #ifdef CONFIG_DETECT_SOFTLOCKUP
295 extern void softlockup_tick(void);
296 extern void touch_softlockup_watchdog(void);
297 extern void touch_all_softlockup_watchdogs(void);
298 extern unsigned int softlockup_panic;
299 extern unsigned long sysctl_hung_task_check_count;
300 extern unsigned long sysctl_hung_task_timeout_secs;
301 extern unsigned long sysctl_hung_task_warnings;
302 extern int softlockup_thresh;
304 static inline void softlockup_tick(void)
307 static inline void spawn_softlockup_task(void)
310 static inline void touch_softlockup_watchdog(void)
313 static inline void touch_all_softlockup_watchdogs(void)
319 /* Attach to any functions which should be ignored in wchan output. */
320 #define __sched __attribute__((__section__(".sched.text")))
322 /* Linker adds these: start and end of __sched functions */
323 extern char __sched_text_start[], __sched_text_end[];
325 /* Is this address in the __sched functions? */
326 extern int in_sched_functions(unsigned long addr);
328 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
329 extern signed long schedule_timeout(signed long timeout);
330 extern signed long schedule_timeout_interruptible(signed long timeout);
331 extern signed long schedule_timeout_killable(signed long timeout);
332 extern signed long schedule_timeout_uninterruptible(signed long timeout);
333 asmlinkage void schedule(void);
336 struct user_namespace;
338 /* Maximum number of active map areas.. This is a random (large) number */
339 #define DEFAULT_MAX_MAP_COUNT 65536
341 extern int sysctl_max_map_count;
343 #include <linux/aio.h>
346 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
347 unsigned long, unsigned long);
349 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
350 unsigned long len, unsigned long pgoff,
351 unsigned long flags);
352 extern void arch_unmap_area(struct mm_struct *, unsigned long);
353 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
355 #if USE_SPLIT_PTLOCKS
357 * The mm counters are not protected by its page_table_lock,
358 * so must be incremented atomically.
360 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
361 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
362 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
363 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
364 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
366 #else /* !USE_SPLIT_PTLOCKS */
368 * The mm counters are protected by its page_table_lock,
369 * so can be incremented directly.
371 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
372 #define get_mm_counter(mm, member) ((mm)->_##member)
373 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
374 #define inc_mm_counter(mm, member) (mm)->_##member++
375 #define dec_mm_counter(mm, member) (mm)->_##member--
377 #endif /* !USE_SPLIT_PTLOCKS */
379 #define get_mm_rss(mm) \
380 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
381 #define update_hiwater_rss(mm) do { \
382 unsigned long _rss = get_mm_rss(mm); \
383 if ((mm)->hiwater_rss < _rss) \
384 (mm)->hiwater_rss = _rss; \
386 #define update_hiwater_vm(mm) do { \
387 if ((mm)->hiwater_vm < (mm)->total_vm) \
388 (mm)->hiwater_vm = (mm)->total_vm; \
391 extern void set_dumpable(struct mm_struct *mm, int value);
392 extern int get_dumpable(struct mm_struct *mm);
396 #define MMF_DUMPABLE 0 /* core dump is permitted */
397 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
398 #define MMF_DUMPABLE_BITS 2
400 /* coredump filter bits */
401 #define MMF_DUMP_ANON_PRIVATE 2
402 #define MMF_DUMP_ANON_SHARED 3
403 #define MMF_DUMP_MAPPED_PRIVATE 4
404 #define MMF_DUMP_MAPPED_SHARED 5
405 #define MMF_DUMP_ELF_HEADERS 6
406 #define MMF_DUMP_HUGETLB_PRIVATE 7
407 #define MMF_DUMP_HUGETLB_SHARED 8
408 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
409 #define MMF_DUMP_FILTER_BITS 7
410 #define MMF_DUMP_FILTER_MASK \
411 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
412 #define MMF_DUMP_FILTER_DEFAULT \
413 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
414 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
416 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
417 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
419 # define MMF_DUMP_MASK_DEFAULT_ELF 0
422 struct sighand_struct {
424 struct k_sigaction action[_NSIG];
426 wait_queue_head_t signalfd_wqh;
429 struct pacct_struct {
432 unsigned long ac_mem;
433 cputime_t ac_utime, ac_stime;
434 unsigned long ac_minflt, ac_majflt;
438 * struct task_cputime - collected CPU time counts
439 * @utime: time spent in user mode, in &cputime_t units
440 * @stime: time spent in kernel mode, in &cputime_t units
441 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
443 * This structure groups together three kinds of CPU time that are
444 * tracked for threads and thread groups. Most things considering
445 * CPU time want to group these counts together and treat all three
446 * of them in parallel.
448 struct task_cputime {
451 unsigned long long sum_exec_runtime;
453 /* Alternate field names when used to cache expirations. */
454 #define prof_exp stime
455 #define virt_exp utime
456 #define sched_exp sum_exec_runtime
459 * struct thread_group_cputime - thread group interval timer counts
460 * @totals: thread group interval timers; substructure for
461 * uniprocessor kernel, per-cpu for SMP kernel.
463 * This structure contains the version of task_cputime, above, that is
464 * used for thread group CPU clock calculations.
466 struct thread_group_cputime {
467 struct task_cputime *totals;
471 * NOTE! "signal_struct" does not have it's own
472 * locking, because a shared signal_struct always
473 * implies a shared sighand_struct, so locking
474 * sighand_struct is always a proper superset of
475 * the locking of signal_struct.
477 struct signal_struct {
481 wait_queue_head_t wait_chldexit; /* for wait4() */
483 /* current thread group signal load-balancing target: */
484 struct task_struct *curr_target;
486 /* shared signal handling: */
487 struct sigpending shared_pending;
489 /* thread group exit support */
492 * - notify group_exit_task when ->count is equal to notify_count
493 * - everyone except group_exit_task is stopped during signal delivery
494 * of fatal signals, group_exit_task processes the signal.
497 struct task_struct *group_exit_task;
499 /* thread group stop support, overloads group_exit_code too */
500 int group_stop_count;
501 unsigned int flags; /* see SIGNAL_* flags below */
503 /* POSIX.1b Interval Timers */
504 struct list_head posix_timers;
506 /* ITIMER_REAL timer for the process */
507 struct hrtimer real_timer;
508 struct pid *leader_pid;
509 ktime_t it_real_incr;
511 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
512 cputime_t it_prof_expires, it_virt_expires;
513 cputime_t it_prof_incr, it_virt_incr;
516 * Thread group totals for process CPU clocks.
517 * See thread_group_cputime(), et al, for details.
519 struct thread_group_cputime cputime;
521 /* Earliest-expiration cache. */
522 struct task_cputime cputime_expires;
524 struct list_head cpu_timers[3];
526 /* job control IDs */
529 * pgrp and session fields are deprecated.
530 * use the task_session_Xnr and task_pgrp_Xnr routines below
534 pid_t pgrp __deprecated;
538 struct pid *tty_old_pgrp;
541 pid_t session __deprecated;
545 /* boolean value for session group leader */
548 struct tty_struct *tty; /* NULL if no tty */
551 * Cumulative resource counters for dead threads in the group,
552 * and for reaped dead child processes forked by this group.
553 * Live threads maintain their own counters and add to these
554 * in __exit_signal, except for the group leader.
556 cputime_t cutime, cstime;
559 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
560 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
561 unsigned long inblock, oublock, cinblock, coublock;
562 struct task_io_accounting ioac;
565 * We don't bother to synchronize most readers of this at all,
566 * because there is no reader checking a limit that actually needs
567 * to get both rlim_cur and rlim_max atomically, and either one
568 * alone is a single word that can safely be read normally.
569 * getrlimit/setrlimit use task_lock(current->group_leader) to
570 * protect this instead of the siglock, because they really
571 * have no need to disable irqs.
573 struct rlimit rlim[RLIM_NLIMITS];
575 /* keep the process-shared keyrings here so that they do the right
576 * thing in threads created with CLONE_THREAD */
578 struct key *session_keyring; /* keyring inherited over fork */
579 struct key *process_keyring; /* keyring private to this process */
581 #ifdef CONFIG_BSD_PROCESS_ACCT
582 struct pacct_struct pacct; /* per-process accounting information */
584 #ifdef CONFIG_TASKSTATS
585 struct taskstats *stats;
589 struct tty_audit_buf *tty_audit_buf;
593 /* Context switch must be unlocked if interrupts are to be enabled */
594 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
595 # define __ARCH_WANT_UNLOCKED_CTXSW
599 * Bits in flags field of signal_struct.
601 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
602 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
603 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
604 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
606 * Pending notifications to parent.
608 #define SIGNAL_CLD_STOPPED 0x00000010
609 #define SIGNAL_CLD_CONTINUED 0x00000020
610 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
612 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
614 /* If true, all threads except ->group_exit_task have pending SIGKILL */
615 static inline int signal_group_exit(const struct signal_struct *sig)
617 return (sig->flags & SIGNAL_GROUP_EXIT) ||
618 (sig->group_exit_task != NULL);
622 * Some day this will be a full-fledged user tracking system..
625 atomic_t __count; /* reference count */
626 atomic_t processes; /* How many processes does this user have? */
627 atomic_t files; /* How many open files does this user have? */
628 atomic_t sigpending; /* How many pending signals does this user have? */
629 #ifdef CONFIG_INOTIFY_USER
630 atomic_t inotify_watches; /* How many inotify watches does this user have? */
631 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
633 #ifdef CONFIG_POSIX_MQUEUE
634 /* protected by mq_lock */
635 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
637 unsigned long locked_shm; /* How many pages of mlocked shm ? */
640 struct key *uid_keyring; /* UID specific keyring */
641 struct key *session_keyring; /* UID's default session keyring */
644 /* Hash table maintenance information */
645 struct hlist_node uidhash_node;
648 #ifdef CONFIG_USER_SCHED
649 struct task_group *tg;
652 struct work_struct work;
657 extern int uids_sysfs_init(void);
659 extern struct user_struct *find_user(uid_t);
661 extern struct user_struct root_user;
662 #define INIT_USER (&root_user)
664 struct backing_dev_info;
665 struct reclaim_state;
667 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
669 /* cumulative counters */
670 unsigned long pcount; /* # of times run on this cpu */
671 unsigned long long cpu_time, /* time spent on the cpu */
672 run_delay; /* time spent waiting on a runqueue */
675 unsigned long long last_arrival,/* when we last ran on a cpu */
676 last_queued; /* when we were last queued to run */
677 #ifdef CONFIG_SCHEDSTATS
679 unsigned int bkl_count;
682 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
684 #ifdef CONFIG_SCHEDSTATS
685 extern const struct file_operations proc_schedstat_operations;
686 #endif /* CONFIG_SCHEDSTATS */
688 #ifdef CONFIG_TASK_DELAY_ACCT
689 struct task_delay_info {
691 unsigned int flags; /* Private per-task flags */
693 /* For each stat XXX, add following, aligned appropriately
695 * struct timespec XXX_start, XXX_end;
699 * Atomicity of updates to XXX_delay, XXX_count protected by
700 * single lock above (split into XXX_lock if contention is an issue).
704 * XXX_count is incremented on every XXX operation, the delay
705 * associated with the operation is added to XXX_delay.
706 * XXX_delay contains the accumulated delay time in nanoseconds.
708 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
709 u64 blkio_delay; /* wait for sync block io completion */
710 u64 swapin_delay; /* wait for swapin block io completion */
711 u32 blkio_count; /* total count of the number of sync block */
712 /* io operations performed */
713 u32 swapin_count; /* total count of the number of swapin block */
714 /* io operations performed */
716 struct timespec freepages_start, freepages_end;
717 u64 freepages_delay; /* wait for memory reclaim */
718 u32 freepages_count; /* total count of memory reclaim */
720 #endif /* CONFIG_TASK_DELAY_ACCT */
722 static inline int sched_info_on(void)
724 #ifdef CONFIG_SCHEDSTATS
726 #elif defined(CONFIG_TASK_DELAY_ACCT)
727 extern int delayacct_on;
742 * sched-domains (multiprocessor balancing) declarations:
746 * Increase resolution of nice-level calculations:
748 #define SCHED_LOAD_SHIFT 10
749 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
751 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
754 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
755 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
756 #define SD_BALANCE_EXEC 4 /* Balance on exec */
757 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
758 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
759 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
760 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
761 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
762 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
763 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
764 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
765 #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
767 #define BALANCE_FOR_MC_POWER \
768 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
770 #define BALANCE_FOR_PKG_POWER \
771 ((sched_mc_power_savings || sched_smt_power_savings) ? \
772 SD_POWERSAVINGS_BALANCE : 0)
774 #define test_sd_parent(sd, flag) ((sd->parent && \
775 (sd->parent->flags & flag)) ? 1 : 0)
779 struct sched_group *next; /* Must be a circular list */
783 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
784 * single CPU. This is read only (except for setup, hotplug CPU).
785 * Note : Never change cpu_power without recompute its reciprocal
787 unsigned int __cpu_power;
789 * reciprocal value of cpu_power to avoid expensive divides
790 * (see include/linux/reciprocal_div.h)
792 u32 reciprocal_cpu_power;
795 enum sched_domain_level {
805 struct sched_domain_attr {
806 int relax_domain_level;
809 #define SD_ATTR_INIT (struct sched_domain_attr) { \
810 .relax_domain_level = -1, \
813 struct sched_domain {
814 /* These fields must be setup */
815 struct sched_domain *parent; /* top domain must be null terminated */
816 struct sched_domain *child; /* bottom domain must be null terminated */
817 struct sched_group *groups; /* the balancing groups of the domain */
818 cpumask_t span; /* span of all CPUs in this domain */
819 unsigned long min_interval; /* Minimum balance interval ms */
820 unsigned long max_interval; /* Maximum balance interval ms */
821 unsigned int busy_factor; /* less balancing by factor if busy */
822 unsigned int imbalance_pct; /* No balance until over watermark */
823 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
824 unsigned int busy_idx;
825 unsigned int idle_idx;
826 unsigned int newidle_idx;
827 unsigned int wake_idx;
828 unsigned int forkexec_idx;
829 int flags; /* See SD_* */
830 enum sched_domain_level level;
832 /* Runtime fields. */
833 unsigned long last_balance; /* init to jiffies. units in jiffies */
834 unsigned int balance_interval; /* initialise to 1. units in ms. */
835 unsigned int nr_balance_failed; /* initialise to 0 */
839 #ifdef CONFIG_SCHEDSTATS
840 /* load_balance() stats */
841 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
842 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
843 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
844 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
845 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
846 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
847 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
848 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
850 /* Active load balancing */
851 unsigned int alb_count;
852 unsigned int alb_failed;
853 unsigned int alb_pushed;
855 /* SD_BALANCE_EXEC stats */
856 unsigned int sbe_count;
857 unsigned int sbe_balanced;
858 unsigned int sbe_pushed;
860 /* SD_BALANCE_FORK stats */
861 unsigned int sbf_count;
862 unsigned int sbf_balanced;
863 unsigned int sbf_pushed;
865 /* try_to_wake_up() stats */
866 unsigned int ttwu_wake_remote;
867 unsigned int ttwu_move_affine;
868 unsigned int ttwu_move_balance;
870 #ifdef CONFIG_SCHED_DEBUG
875 extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
876 struct sched_domain_attr *dattr_new);
877 extern int arch_reinit_sched_domains(void);
879 #else /* CONFIG_SMP */
881 struct sched_domain_attr;
884 partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
885 struct sched_domain_attr *dattr_new)
888 #endif /* !CONFIG_SMP */
890 struct io_context; /* See blkdev.h */
891 #define NGROUPS_SMALL 32
892 #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
896 gid_t small_block[NGROUPS_SMALL];
902 * get_group_info() must be called with the owning task locked (via task_lock())
903 * when task != current. The reason being that the vast majority of callers are
904 * looking at current->group_info, which can not be changed except by the
905 * current task. Changing current->group_info requires the task lock, too.
907 #define get_group_info(group_info) do { \
908 atomic_inc(&(group_info)->usage); \
911 #define put_group_info(group_info) do { \
912 if (atomic_dec_and_test(&(group_info)->usage)) \
913 groups_free(group_info); \
916 extern struct group_info *groups_alloc(int gidsetsize);
917 extern void groups_free(struct group_info *group_info);
918 extern int set_current_groups(struct group_info *group_info);
919 extern int groups_search(struct group_info *group_info, gid_t grp);
920 /* access the groups "array" with this macro */
921 #define GROUP_AT(gi, i) \
922 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
924 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
925 extern void prefetch_stack(struct task_struct *t);
927 static inline void prefetch_stack(struct task_struct *t) { }
930 struct audit_context; /* See audit.c */
932 struct pipe_inode_info;
933 struct uts_namespace;
939 const struct sched_class *next;
941 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
942 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
943 void (*yield_task) (struct rq *rq);
944 int (*select_task_rq)(struct task_struct *p, int sync);
946 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
948 struct task_struct * (*pick_next_task) (struct rq *rq);
949 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
952 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
953 struct rq *busiest, unsigned long max_load_move,
954 struct sched_domain *sd, enum cpu_idle_type idle,
955 int *all_pinned, int *this_best_prio);
957 int (*move_one_task) (struct rq *this_rq, int this_cpu,
958 struct rq *busiest, struct sched_domain *sd,
959 enum cpu_idle_type idle);
960 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
961 void (*post_schedule) (struct rq *this_rq);
962 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
965 void (*set_curr_task) (struct rq *rq);
966 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
967 void (*task_new) (struct rq *rq, struct task_struct *p);
968 void (*set_cpus_allowed)(struct task_struct *p,
969 const cpumask_t *newmask);
971 void (*rq_online)(struct rq *rq);
972 void (*rq_offline)(struct rq *rq);
974 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
976 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
978 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
979 int oldprio, int running);
981 #ifdef CONFIG_FAIR_GROUP_SCHED
982 void (*moved_group) (struct task_struct *p);
987 unsigned long weight, inv_weight;
991 * CFS stats for a schedulable entity (task, task-group etc)
993 * Current field usage histogram:
1000 struct sched_entity {
1001 struct load_weight load; /* for load-balancing */
1002 struct rb_node run_node;
1003 struct list_head group_node;
1007 u64 sum_exec_runtime;
1009 u64 prev_sum_exec_runtime;
1014 #ifdef CONFIG_SCHEDSTATS
1022 s64 sum_sleep_runtime;
1030 u64 nr_migrations_cold;
1031 u64 nr_failed_migrations_affine;
1032 u64 nr_failed_migrations_running;
1033 u64 nr_failed_migrations_hot;
1034 u64 nr_forced_migrations;
1035 u64 nr_forced2_migrations;
1038 u64 nr_wakeups_sync;
1039 u64 nr_wakeups_migrate;
1040 u64 nr_wakeups_local;
1041 u64 nr_wakeups_remote;
1042 u64 nr_wakeups_affine;
1043 u64 nr_wakeups_affine_attempts;
1044 u64 nr_wakeups_passive;
1045 u64 nr_wakeups_idle;
1048 #ifdef CONFIG_FAIR_GROUP_SCHED
1049 struct sched_entity *parent;
1050 /* rq on which this entity is (to be) queued: */
1051 struct cfs_rq *cfs_rq;
1052 /* rq "owned" by this entity/group: */
1053 struct cfs_rq *my_q;
1057 struct sched_rt_entity {
1058 struct list_head run_list;
1059 unsigned long timeout;
1060 unsigned int time_slice;
1061 int nr_cpus_allowed;
1063 struct sched_rt_entity *back;
1064 #ifdef CONFIG_RT_GROUP_SCHED
1065 struct sched_rt_entity *parent;
1066 /* rq on which this entity is (to be) queued: */
1067 struct rt_rq *rt_rq;
1068 /* rq "owned" by this entity/group: */
1073 struct task_struct {
1074 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1077 unsigned int flags; /* per process flags, defined below */
1078 unsigned int ptrace;
1080 int lock_depth; /* BKL lock depth */
1083 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1088 int prio, static_prio, normal_prio;
1089 unsigned int rt_priority;
1090 const struct sched_class *sched_class;
1091 struct sched_entity se;
1092 struct sched_rt_entity rt;
1094 #ifdef CONFIG_PREEMPT_NOTIFIERS
1095 /* list of struct preempt_notifier: */
1096 struct hlist_head preempt_notifiers;
1100 * fpu_counter contains the number of consecutive context switches
1101 * that the FPU is used. If this is over a threshold, the lazy fpu
1102 * saving becomes unlazy to save the trap. This is an unsigned char
1103 * so that after 256 times the counter wraps and the behavior turns
1104 * lazy again; this to deal with bursty apps that only use FPU for
1107 unsigned char fpu_counter;
1108 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
1109 #ifdef CONFIG_BLK_DEV_IO_TRACE
1110 unsigned int btrace_seq;
1113 unsigned int policy;
1114 cpumask_t cpus_allowed;
1116 #ifdef CONFIG_PREEMPT_RCU
1117 int rcu_read_lock_nesting;
1118 int rcu_flipctr_idx;
1119 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1121 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1122 struct sched_info sched_info;
1125 struct list_head tasks;
1127 struct mm_struct *mm, *active_mm;
1130 struct linux_binfmt *binfmt;
1132 int exit_code, exit_signal;
1133 int pdeath_signal; /* The signal sent when the parent dies */
1135 unsigned int personality;
1136 unsigned did_exec:1;
1140 #ifdef CONFIG_CC_STACKPROTECTOR
1141 /* Canary value for the -fstack-protector gcc feature */
1142 unsigned long stack_canary;
1145 * pointers to (original) parent process, youngest child, younger sibling,
1146 * older sibling, respectively. (p->father can be replaced with
1147 * p->real_parent->pid)
1149 struct task_struct *real_parent; /* real parent process */
1150 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1152 * children/sibling forms the list of my natural children
1154 struct list_head children; /* list of my children */
1155 struct list_head sibling; /* linkage in my parent's children list */
1156 struct task_struct *group_leader; /* threadgroup leader */
1159 * ptraced is the list of tasks this task is using ptrace on.
1160 * This includes both natural children and PTRACE_ATTACH targets.
1161 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1163 struct list_head ptraced;
1164 struct list_head ptrace_entry;
1166 /* PID/PID hash table linkage. */
1167 struct pid_link pids[PIDTYPE_MAX];
1168 struct list_head thread_group;
1170 struct completion *vfork_done; /* for vfork() */
1171 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1172 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1174 cputime_t utime, stime, utimescaled, stimescaled;
1176 cputime_t prev_utime, prev_stime;
1177 unsigned long nvcsw, nivcsw; /* context switch counts */
1178 struct timespec start_time; /* monotonic time */
1179 struct timespec real_start_time; /* boot based time */
1180 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1181 unsigned long min_flt, maj_flt;
1183 struct task_cputime cputime_expires;
1184 struct list_head cpu_timers[3];
1186 /* process credentials */
1187 uid_t uid,euid,suid,fsuid;
1188 gid_t gid,egid,sgid,fsgid;
1189 struct group_info *group_info;
1190 kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset;
1191 struct user_struct *user;
1192 unsigned securebits;
1194 unsigned char jit_keyring; /* default keyring to attach requested keys to */
1195 struct key *request_key_auth; /* assumed request_key authority */
1196 struct key *thread_keyring; /* keyring private to this thread */
1198 char comm[TASK_COMM_LEN]; /* executable name excluding path
1199 - access with [gs]et_task_comm (which lock
1200 it with task_lock())
1201 - initialized normally by flush_old_exec */
1202 /* file system info */
1203 int link_count, total_link_count;
1204 #ifdef CONFIG_SYSVIPC
1206 struct sysv_sem sysvsem;
1208 #ifdef CONFIG_DETECT_SOFTLOCKUP
1209 /* hung task detection */
1210 unsigned long last_switch_timestamp;
1211 unsigned long last_switch_count;
1213 /* CPU-specific state of this task */
1214 struct thread_struct thread;
1215 /* filesystem information */
1216 struct fs_struct *fs;
1217 /* open file information */
1218 struct files_struct *files;
1220 struct nsproxy *nsproxy;
1221 /* signal handlers */
1222 struct signal_struct *signal;
1223 struct sighand_struct *sighand;
1225 sigset_t blocked, real_blocked;
1226 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1227 struct sigpending pending;
1229 unsigned long sas_ss_sp;
1231 int (*notifier)(void *priv);
1232 void *notifier_data;
1233 sigset_t *notifier_mask;
1234 #ifdef CONFIG_SECURITY
1237 struct audit_context *audit_context;
1238 #ifdef CONFIG_AUDITSYSCALL
1240 unsigned int sessionid;
1244 /* Thread group tracking */
1247 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1248 spinlock_t alloc_lock;
1250 /* Protection of the PI data structures: */
1253 #ifdef CONFIG_RT_MUTEXES
1254 /* PI waiters blocked on a rt_mutex held by this task */
1255 struct plist_head pi_waiters;
1256 /* Deadlock detection and priority inheritance handling */
1257 struct rt_mutex_waiter *pi_blocked_on;
1260 #ifdef CONFIG_DEBUG_MUTEXES
1261 /* mutex deadlock detection */
1262 struct mutex_waiter *blocked_on;
1264 #ifdef CONFIG_TRACE_IRQFLAGS
1265 unsigned int irq_events;
1266 int hardirqs_enabled;
1267 unsigned long hardirq_enable_ip;
1268 unsigned int hardirq_enable_event;
1269 unsigned long hardirq_disable_ip;
1270 unsigned int hardirq_disable_event;
1271 int softirqs_enabled;
1272 unsigned long softirq_disable_ip;
1273 unsigned int softirq_disable_event;
1274 unsigned long softirq_enable_ip;
1275 unsigned int softirq_enable_event;
1276 int hardirq_context;
1277 int softirq_context;
1279 #ifdef CONFIG_LOCKDEP
1280 # define MAX_LOCK_DEPTH 48UL
1283 unsigned int lockdep_recursion;
1284 struct held_lock held_locks[MAX_LOCK_DEPTH];
1287 /* journalling filesystem info */
1290 /* stacked block device info */
1291 struct bio *bio_list, **bio_tail;
1294 struct reclaim_state *reclaim_state;
1296 struct backing_dev_info *backing_dev_info;
1298 struct io_context *io_context;
1300 unsigned long ptrace_message;
1301 siginfo_t *last_siginfo; /* For ptrace use. */
1302 struct task_io_accounting ioac;
1303 #if defined(CONFIG_TASK_XACCT)
1304 u64 acct_rss_mem1; /* accumulated rss usage */
1305 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1306 cputime_t acct_timexpd; /* stime + utime since last update */
1308 #ifdef CONFIG_CPUSETS
1309 nodemask_t mems_allowed;
1310 int cpuset_mems_generation;
1311 int cpuset_mem_spread_rotor;
1313 #ifdef CONFIG_CGROUPS
1314 /* Control Group info protected by css_set_lock */
1315 struct css_set *cgroups;
1316 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1317 struct list_head cg_list;
1320 struct robust_list_head __user *robust_list;
1321 #ifdef CONFIG_COMPAT
1322 struct compat_robust_list_head __user *compat_robust_list;
1324 struct list_head pi_state_list;
1325 struct futex_pi_state *pi_state_cache;
1328 struct mempolicy *mempolicy;
1331 atomic_t fs_excl; /* holding fs exclusive resources */
1332 struct rcu_head rcu;
1335 * cache last used pipe for splice
1337 struct pipe_inode_info *splice_pipe;
1338 #ifdef CONFIG_TASK_DELAY_ACCT
1339 struct task_delay_info *delays;
1341 #ifdef CONFIG_FAULT_INJECTION
1344 struct prop_local_single dirties;
1345 #ifdef CONFIG_LATENCYTOP
1346 int latency_record_count;
1347 struct latency_record latency_record[LT_SAVECOUNT];
1352 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1353 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1354 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1355 * values are inverted: lower p->prio value means higher priority.
1357 * The MAX_USER_RT_PRIO value allows the actual maximum
1358 * RT priority to be separate from the value exported to
1359 * user-space. This allows kernel threads to set their
1360 * priority to a value higher than any user task. Note:
1361 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1364 #define MAX_USER_RT_PRIO 100
1365 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1367 #define MAX_PRIO (MAX_RT_PRIO + 40)
1368 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1370 static inline int rt_prio(int prio)
1372 if (unlikely(prio < MAX_RT_PRIO))
1377 static inline int rt_task(struct task_struct *p)
1379 return rt_prio(p->prio);
1382 static inline void set_task_session(struct task_struct *tsk, pid_t session)
1384 tsk->signal->__session = session;
1387 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1389 tsk->signal->__pgrp = pgrp;
1392 static inline struct pid *task_pid(struct task_struct *task)
1394 return task->pids[PIDTYPE_PID].pid;
1397 static inline struct pid *task_tgid(struct task_struct *task)
1399 return task->group_leader->pids[PIDTYPE_PID].pid;
1402 static inline struct pid *task_pgrp(struct task_struct *task)
1404 return task->group_leader->pids[PIDTYPE_PGID].pid;
1407 static inline struct pid *task_session(struct task_struct *task)
1409 return task->group_leader->pids[PIDTYPE_SID].pid;
1412 struct pid_namespace;
1415 * the helpers to get the task's different pids as they are seen
1416 * from various namespaces
1418 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1419 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1421 * task_xid_nr_ns() : id seen from the ns specified;
1423 * set_task_vxid() : assigns a virtual id to a task;
1425 * see also pid_nr() etc in include/linux/pid.h
1428 static inline pid_t task_pid_nr(struct task_struct *tsk)
1433 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1435 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1437 return pid_vnr(task_pid(tsk));
1441 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1446 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1448 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1450 return pid_vnr(task_tgid(tsk));
1454 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1456 return tsk->signal->__pgrp;
1459 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1461 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1463 return pid_vnr(task_pgrp(tsk));
1467 static inline pid_t task_session_nr(struct task_struct *tsk)
1469 return tsk->signal->__session;
1472 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1474 static inline pid_t task_session_vnr(struct task_struct *tsk)
1476 return pid_vnr(task_session(tsk));
1481 * pid_alive - check that a task structure is not stale
1482 * @p: Task structure to be checked.
1484 * Test if a process is not yet dead (at most zombie state)
1485 * If pid_alive fails, then pointers within the task structure
1486 * can be stale and must not be dereferenced.
1488 static inline int pid_alive(struct task_struct *p)
1490 return p->pids[PIDTYPE_PID].pid != NULL;
1494 * is_global_init - check if a task structure is init
1495 * @tsk: Task structure to be checked.
1497 * Check if a task structure is the first user space task the kernel created.
1499 static inline int is_global_init(struct task_struct *tsk)
1501 return tsk->pid == 1;
1505 * is_container_init:
1506 * check whether in the task is init in its own pid namespace.
1508 extern int is_container_init(struct task_struct *tsk);
1510 extern struct pid *cad_pid;
1512 extern void free_task(struct task_struct *tsk);
1513 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1515 extern void __put_task_struct(struct task_struct *t);
1517 static inline void put_task_struct(struct task_struct *t)
1519 if (atomic_dec_and_test(&t->usage))
1520 __put_task_struct(t);
1523 extern cputime_t task_utime(struct task_struct *p);
1524 extern cputime_t task_stime(struct task_struct *p);
1525 extern cputime_t task_gtime(struct task_struct *p);
1530 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1531 /* Not implemented yet, only for 486*/
1532 #define PF_STARTING 0x00000002 /* being created */
1533 #define PF_EXITING 0x00000004 /* getting shut down */
1534 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1535 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1536 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1537 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1538 #define PF_DUMPCORE 0x00000200 /* dumped core */
1539 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1540 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1541 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1542 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1543 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1544 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1545 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1546 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1547 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1548 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1549 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1550 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1551 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1552 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1553 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1554 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1555 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1556 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1557 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1558 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1561 * Only the _current_ task can read/write to tsk->flags, but other
1562 * tasks can access tsk->flags in readonly mode for example
1563 * with tsk_used_math (like during threaded core dumping).
1564 * There is however an exception to this rule during ptrace
1565 * or during fork: the ptracer task is allowed to write to the
1566 * child->flags of its traced child (same goes for fork, the parent
1567 * can write to the child->flags), because we're guaranteed the
1568 * child is not running and in turn not changing child->flags
1569 * at the same time the parent does it.
1571 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1572 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1573 #define clear_used_math() clear_stopped_child_used_math(current)
1574 #define set_used_math() set_stopped_child_used_math(current)
1575 #define conditional_stopped_child_used_math(condition, child) \
1576 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1577 #define conditional_used_math(condition) \
1578 conditional_stopped_child_used_math(condition, current)
1579 #define copy_to_stopped_child_used_math(child) \
1580 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1581 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1582 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1583 #define used_math() tsk_used_math(current)
1586 extern int set_cpus_allowed_ptr(struct task_struct *p,
1587 const cpumask_t *new_mask);
1589 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1590 const cpumask_t *new_mask)
1592 if (!cpu_isset(0, *new_mask))
1597 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1599 return set_cpus_allowed_ptr(p, &new_mask);
1602 extern unsigned long long sched_clock(void);
1604 extern void sched_clock_init(void);
1605 extern u64 sched_clock_cpu(int cpu);
1607 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1608 static inline void sched_clock_tick(void)
1612 static inline void sched_clock_idle_sleep_event(void)
1616 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1620 extern void sched_clock_tick(void);
1621 extern void sched_clock_idle_sleep_event(void);
1622 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1626 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1627 * clock constructed from sched_clock():
1629 extern unsigned long long cpu_clock(int cpu);
1631 extern unsigned long long
1632 task_sched_runtime(struct task_struct *task);
1633 extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1635 /* sched_exec is called by processes performing an exec */
1637 extern void sched_exec(void);
1639 #define sched_exec() {}
1642 extern void sched_clock_idle_sleep_event(void);
1643 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1645 #ifdef CONFIG_HOTPLUG_CPU
1646 extern void idle_task_exit(void);
1648 static inline void idle_task_exit(void) {}
1651 extern void sched_idle_next(void);
1653 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1654 extern void wake_up_idle_cpu(int cpu);
1656 static inline void wake_up_idle_cpu(int cpu) { }
1659 #ifdef CONFIG_SCHED_DEBUG
1660 extern unsigned int sysctl_sched_latency;
1661 extern unsigned int sysctl_sched_min_granularity;
1662 extern unsigned int sysctl_sched_wakeup_granularity;
1663 extern unsigned int sysctl_sched_child_runs_first;
1664 extern unsigned int sysctl_sched_features;
1665 extern unsigned int sysctl_sched_migration_cost;
1666 extern unsigned int sysctl_sched_nr_migrate;
1667 extern unsigned int sysctl_sched_shares_ratelimit;
1669 int sched_nr_latency_handler(struct ctl_table *table, int write,
1670 struct file *file, void __user *buffer, size_t *length,
1673 extern unsigned int sysctl_sched_rt_period;
1674 extern int sysctl_sched_rt_runtime;
1676 int sched_rt_handler(struct ctl_table *table, int write,
1677 struct file *filp, void __user *buffer, size_t *lenp,
1680 extern unsigned int sysctl_sched_compat_yield;
1682 #ifdef CONFIG_RT_MUTEXES
1683 extern int rt_mutex_getprio(struct task_struct *p);
1684 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1685 extern void rt_mutex_adjust_pi(struct task_struct *p);
1687 static inline int rt_mutex_getprio(struct task_struct *p)
1689 return p->normal_prio;
1691 # define rt_mutex_adjust_pi(p) do { } while (0)
1694 extern void set_user_nice(struct task_struct *p, long nice);
1695 extern int task_prio(const struct task_struct *p);
1696 extern int task_nice(const struct task_struct *p);
1697 extern int can_nice(const struct task_struct *p, const int nice);
1698 extern int task_curr(const struct task_struct *p);
1699 extern int idle_cpu(int cpu);
1700 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1701 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1702 struct sched_param *);
1703 extern struct task_struct *idle_task(int cpu);
1704 extern struct task_struct *curr_task(int cpu);
1705 extern void set_curr_task(int cpu, struct task_struct *p);
1710 * The default (Linux) execution domain.
1712 extern struct exec_domain default_exec_domain;
1714 union thread_union {
1715 struct thread_info thread_info;
1716 unsigned long stack[THREAD_SIZE/sizeof(long)];
1719 #ifndef __HAVE_ARCH_KSTACK_END
1720 static inline int kstack_end(void *addr)
1722 /* Reliable end of stack detection:
1723 * Some APM bios versions misalign the stack
1725 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1729 extern union thread_union init_thread_union;
1730 extern struct task_struct init_task;
1732 extern struct mm_struct init_mm;
1734 extern struct pid_namespace init_pid_ns;
1737 * find a task by one of its numerical ids
1739 * find_task_by_pid_type_ns():
1740 * it is the most generic call - it finds a task by all id,
1741 * type and namespace specified
1742 * find_task_by_pid_ns():
1743 * finds a task by its pid in the specified namespace
1744 * find_task_by_vpid():
1745 * finds a task by its virtual pid
1747 * see also find_vpid() etc in include/linux/pid.h
1750 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1751 struct pid_namespace *ns);
1753 extern struct task_struct *find_task_by_vpid(pid_t nr);
1754 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1755 struct pid_namespace *ns);
1757 extern void __set_special_pids(struct pid *pid);
1759 /* per-UID process charging. */
1760 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1761 static inline struct user_struct *get_uid(struct user_struct *u)
1763 atomic_inc(&u->__count);
1766 extern void free_uid(struct user_struct *);
1767 extern void switch_uid(struct user_struct *);
1768 extern void release_uids(struct user_namespace *ns);
1770 #include <asm/current.h>
1772 extern void do_timer(unsigned long ticks);
1774 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1775 extern int wake_up_process(struct task_struct *tsk);
1776 extern void wake_up_new_task(struct task_struct *tsk,
1777 unsigned long clone_flags);
1779 extern void kick_process(struct task_struct *tsk);
1781 static inline void kick_process(struct task_struct *tsk) { }
1783 extern void sched_fork(struct task_struct *p, int clone_flags);
1784 extern void sched_dead(struct task_struct *p);
1786 extern int in_group_p(gid_t);
1787 extern int in_egroup_p(gid_t);
1789 extern void proc_caches_init(void);
1790 extern void flush_signals(struct task_struct *);
1791 extern void ignore_signals(struct task_struct *);
1792 extern void flush_signal_handlers(struct task_struct *, int force_default);
1793 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1795 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1797 unsigned long flags;
1800 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1801 ret = dequeue_signal(tsk, mask, info);
1802 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1807 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1809 extern void unblock_all_signals(void);
1810 extern void release_task(struct task_struct * p);
1811 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1812 extern int force_sigsegv(int, struct task_struct *);
1813 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1814 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1815 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1816 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1817 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1818 extern int kill_pid(struct pid *pid, int sig, int priv);
1819 extern int kill_proc_info(int, struct siginfo *, pid_t);
1820 extern int do_notify_parent(struct task_struct *, int);
1821 extern void force_sig(int, struct task_struct *);
1822 extern void force_sig_specific(int, struct task_struct *);
1823 extern int send_sig(int, struct task_struct *, int);
1824 extern void zap_other_threads(struct task_struct *p);
1825 extern struct sigqueue *sigqueue_alloc(void);
1826 extern void sigqueue_free(struct sigqueue *);
1827 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
1828 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1829 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1831 static inline int kill_cad_pid(int sig, int priv)
1833 return kill_pid(cad_pid, sig, priv);
1836 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1837 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1838 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1839 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1841 static inline int is_si_special(const struct siginfo *info)
1843 return info <= SEND_SIG_FORCED;
1846 /* True if we are on the alternate signal stack. */
1848 static inline int on_sig_stack(unsigned long sp)
1850 return (sp - current->sas_ss_sp < current->sas_ss_size);
1853 static inline int sas_ss_flags(unsigned long sp)
1855 return (current->sas_ss_size == 0 ? SS_DISABLE
1856 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1860 * Routines for handling mm_structs
1862 extern struct mm_struct * mm_alloc(void);
1864 /* mmdrop drops the mm and the page tables */
1865 extern void __mmdrop(struct mm_struct *);
1866 static inline void mmdrop(struct mm_struct * mm)
1868 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1872 /* mmput gets rid of the mappings and all user-space */
1873 extern void mmput(struct mm_struct *);
1874 /* Grab a reference to a task's mm, if it is not already going away */
1875 extern struct mm_struct *get_task_mm(struct task_struct *task);
1876 /* Remove the current tasks stale references to the old mm_struct */
1877 extern void mm_release(struct task_struct *, struct mm_struct *);
1878 /* Allocate a new mm structure and copy contents from tsk->mm */
1879 extern struct mm_struct *dup_mm(struct task_struct *tsk);
1881 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1882 extern void flush_thread(void);
1883 extern void exit_thread(void);
1885 extern void exit_files(struct task_struct *);
1886 extern void __cleanup_signal(struct signal_struct *);
1887 extern void __cleanup_sighand(struct sighand_struct *);
1889 extern void exit_itimers(struct signal_struct *);
1890 extern void flush_itimer_signals(void);
1892 extern NORET_TYPE void do_group_exit(int);
1894 extern void daemonize(const char *, ...);
1895 extern int allow_signal(int);
1896 extern int disallow_signal(int);
1898 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1899 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1900 struct task_struct *fork_idle(int);
1902 extern void set_task_comm(struct task_struct *tsk, char *from);
1903 extern char *get_task_comm(char *to, struct task_struct *tsk);
1906 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
1908 static inline unsigned long wait_task_inactive(struct task_struct *p,
1915 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1917 #define for_each_process(p) \
1918 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1921 * Careful: do_each_thread/while_each_thread is a double loop so
1922 * 'break' will not work as expected - use goto instead.
1924 #define do_each_thread(g, t) \
1925 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1927 #define while_each_thread(g, t) \
1928 while ((t = next_thread(t)) != g)
1930 /* de_thread depends on thread_group_leader not being a pid based check */
1931 #define thread_group_leader(p) (p == p->group_leader)
1933 /* Do to the insanities of de_thread it is possible for a process
1934 * to have the pid of the thread group leader without actually being
1935 * the thread group leader. For iteration through the pids in proc
1936 * all we care about is that we have a task with the appropriate
1937 * pid, we don't actually care if we have the right task.
1939 static inline int has_group_leader_pid(struct task_struct *p)
1941 return p->pid == p->tgid;
1945 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1947 return p1->tgid == p2->tgid;
1950 static inline struct task_struct *next_thread(const struct task_struct *p)
1952 return list_entry(rcu_dereference(p->thread_group.next),
1953 struct task_struct, thread_group);
1956 static inline int thread_group_empty(struct task_struct *p)
1958 return list_empty(&p->thread_group);
1961 #define delay_group_leader(p) \
1962 (thread_group_leader(p) && !thread_group_empty(p))
1965 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1966 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1967 * pins the final release of task.io_context. Also protects ->cpuset and
1968 * ->cgroup.subsys[].
1970 * Nests both inside and outside of read_lock(&tasklist_lock).
1971 * It must not be nested with write_lock_irq(&tasklist_lock),
1972 * neither inside nor outside.
1974 static inline void task_lock(struct task_struct *p)
1976 spin_lock(&p->alloc_lock);
1979 static inline void task_unlock(struct task_struct *p)
1981 spin_unlock(&p->alloc_lock);
1984 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1985 unsigned long *flags);
1987 static inline void unlock_task_sighand(struct task_struct *tsk,
1988 unsigned long *flags)
1990 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1993 #ifndef __HAVE_THREAD_FUNCTIONS
1995 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
1996 #define task_stack_page(task) ((task)->stack)
1998 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2000 *task_thread_info(p) = *task_thread_info(org);
2001 task_thread_info(p)->task = p;
2004 static inline unsigned long *end_of_stack(struct task_struct *p)
2006 return (unsigned long *)(task_thread_info(p) + 1);
2011 static inline int object_is_on_stack(void *obj)
2013 void *stack = task_stack_page(current);
2015 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2018 extern void thread_info_cache_init(void);
2020 /* set thread flags in other task's structures
2021 * - see asm/thread_info.h for TIF_xxxx flags available
2023 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2025 set_ti_thread_flag(task_thread_info(tsk), flag);
2028 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2030 clear_ti_thread_flag(task_thread_info(tsk), flag);
2033 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2035 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2038 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2040 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2043 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2045 return test_ti_thread_flag(task_thread_info(tsk), flag);
2048 static inline void set_tsk_need_resched(struct task_struct *tsk)
2050 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2053 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2055 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2058 static inline int test_tsk_need_resched(struct task_struct *tsk)
2060 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2063 static inline int signal_pending(struct task_struct *p)
2065 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2068 extern int __fatal_signal_pending(struct task_struct *p);
2070 static inline int fatal_signal_pending(struct task_struct *p)
2072 return signal_pending(p) && __fatal_signal_pending(p);
2075 static inline int signal_pending_state(long state, struct task_struct *p)
2077 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2079 if (!signal_pending(p))
2082 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2085 static inline int need_resched(void)
2087 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2091 * cond_resched() and cond_resched_lock(): latency reduction via
2092 * explicit rescheduling in places that are safe. The return
2093 * value indicates whether a reschedule was done in fact.
2094 * cond_resched_lock() will drop the spinlock before scheduling,
2095 * cond_resched_softirq() will enable bhs before scheduling.
2097 extern int _cond_resched(void);
2098 #ifdef CONFIG_PREEMPT_BKL
2099 static inline int cond_resched(void)
2104 static inline int cond_resched(void)
2106 return _cond_resched();
2109 extern int cond_resched_lock(spinlock_t * lock);
2110 extern int cond_resched_softirq(void);
2111 static inline int cond_resched_bkl(void)
2113 return _cond_resched();
2117 * Does a critical section need to be broken due to another
2118 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2119 * but a general need for low latency)
2121 static inline int spin_needbreak(spinlock_t *lock)
2123 #ifdef CONFIG_PREEMPT
2124 return spin_is_contended(lock);
2131 * Thread group CPU time accounting.
2134 extern int thread_group_cputime_alloc(struct task_struct *);
2135 extern void thread_group_cputime(struct task_struct *, struct task_cputime *);
2137 static inline void thread_group_cputime_init(struct signal_struct *sig)
2139 sig->cputime.totals = NULL;
2142 static inline int thread_group_cputime_clone_thread(struct task_struct *curr)
2144 if (curr->signal->cputime.totals)
2146 return thread_group_cputime_alloc(curr);
2149 static inline void thread_group_cputime_free(struct signal_struct *sig)
2151 free_percpu(sig->cputime.totals);
2155 * Reevaluate whether the task has signals pending delivery.
2156 * Wake the task if so.
2157 * This is required every time the blocked sigset_t changes.
2158 * callers must hold sighand->siglock.
2160 extern void recalc_sigpending_and_wake(struct task_struct *t);
2161 extern void recalc_sigpending(void);
2163 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2166 * Wrappers for p->thread_info->cpu access. No-op on UP.
2170 static inline unsigned int task_cpu(const struct task_struct *p)
2172 return task_thread_info(p)->cpu;
2175 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2179 static inline unsigned int task_cpu(const struct task_struct *p)
2184 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2188 #endif /* CONFIG_SMP */
2190 extern void arch_pick_mmap_layout(struct mm_struct *mm);
2192 #ifdef CONFIG_TRACING
2194 __trace_special(void *__tr, void *__data,
2195 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2198 __trace_special(void *__tr, void *__data,
2199 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2204 extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
2205 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
2207 extern int sched_mc_power_savings, sched_smt_power_savings;
2209 extern void normalize_rt_tasks(void);
2211 #ifdef CONFIG_GROUP_SCHED
2213 extern struct task_group init_task_group;
2214 #ifdef CONFIG_USER_SCHED
2215 extern struct task_group root_task_group;
2218 extern struct task_group *sched_create_group(struct task_group *parent);
2219 extern void sched_destroy_group(struct task_group *tg);
2220 extern void sched_move_task(struct task_struct *tsk);
2221 #ifdef CONFIG_FAIR_GROUP_SCHED
2222 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2223 extern unsigned long sched_group_shares(struct task_group *tg);
2225 #ifdef CONFIG_RT_GROUP_SCHED
2226 extern int sched_group_set_rt_runtime(struct task_group *tg,
2227 long rt_runtime_us);
2228 extern long sched_group_rt_runtime(struct task_group *tg);
2229 extern int sched_group_set_rt_period(struct task_group *tg,
2231 extern long sched_group_rt_period(struct task_group *tg);
2235 #ifdef CONFIG_TASK_XACCT
2236 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2238 tsk->ioac.rchar += amt;
2241 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2243 tsk->ioac.wchar += amt;
2246 static inline void inc_syscr(struct task_struct *tsk)
2251 static inline void inc_syscw(struct task_struct *tsk)
2256 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2260 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2264 static inline void inc_syscr(struct task_struct *tsk)
2268 static inline void inc_syscw(struct task_struct *tsk)
2273 #ifndef TASK_SIZE_OF
2274 #define TASK_SIZE_OF(tsk) TASK_SIZE
2277 #ifdef CONFIG_MM_OWNER
2278 extern void mm_update_next_owner(struct mm_struct *mm);
2279 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2281 static inline void mm_update_next_owner(struct mm_struct *mm)
2285 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2288 #endif /* CONFIG_MM_OWNER */
2290 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2292 #endif /* __KERNEL__ */