7 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
8 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
9 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
10 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
11 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
12 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
13 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
14 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
15 #define CLONE_THREAD 0x00010000 /* Same thread group? */
16 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
17 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
18 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
19 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
20 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
21 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
22 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
23 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
24 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
25 #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
26 #define CLONE_NEWIPC 0x08000000 /* New ipcs */
27 #define CLONE_NEWUSER 0x10000000 /* New user namespace */
28 #define CLONE_NEWPID 0x20000000 /* New pid namespace */
29 #define CLONE_NEWNET 0x40000000 /* New network namespace */
30 #define CLONE_IO 0x80000000 /* Clone io context */
35 #define SCHED_NORMAL 0
39 /* SCHED_ISO: reserved but not implemented yet */
48 #include <asm/param.h> /* for HZ */
50 #include <linux/capability.h>
51 #include <linux/threads.h>
52 #include <linux/kernel.h>
53 #include <linux/types.h>
54 #include <linux/timex.h>
55 #include <linux/jiffies.h>
56 #include <linux/rbtree.h>
57 #include <linux/thread_info.h>
58 #include <linux/cpumask.h>
59 #include <linux/errno.h>
60 #include <linux/nodemask.h>
61 #include <linux/mm_types.h>
63 #include <asm/system.h>
65 #include <asm/ptrace.h>
66 #include <asm/cputime.h>
68 #include <linux/smp.h>
69 #include <linux/sem.h>
70 #include <linux/signal.h>
71 #include <linux/fs_struct.h>
72 #include <linux/compiler.h>
73 #include <linux/completion.h>
74 #include <linux/pid.h>
75 #include <linux/percpu.h>
76 #include <linux/topology.h>
77 #include <linux/proportions.h>
78 #include <linux/seccomp.h>
79 #include <linux/rcupdate.h>
80 #include <linux/rtmutex.h>
82 #include <linux/time.h>
83 #include <linux/param.h>
84 #include <linux/resource.h>
85 #include <linux/timer.h>
86 #include <linux/hrtimer.h>
87 #include <linux/task_io_accounting.h>
88 #include <linux/kobject.h>
89 #include <linux/latencytop.h>
90 #include <linux/cred.h>
92 #include <asm/processor.h>
96 struct futex_pi_state;
97 struct robust_list_head;
102 * List of flags we want to share for kernel threads,
103 * if only because they are not used by them anyway.
105 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
108 * These are the constant used to fake the fixed-point load-average
109 * counting. Some notes:
110 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
111 * a load-average precision of 10 bits integer + 11 bits fractional
112 * - if you want to count load-averages more often, you need more
113 * precision, or rounding will get you. With 2-second counting freq,
114 * the EXP_n values would be 1981, 2034 and 2043 if still using only
117 extern unsigned long avenrun[]; /* Load averages */
119 #define FSHIFT 11 /* nr of bits of precision */
120 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
121 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
122 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
123 #define EXP_5 2014 /* 1/exp(5sec/5min) */
124 #define EXP_15 2037 /* 1/exp(5sec/15min) */
126 #define CALC_LOAD(load,exp,n) \
128 load += n*(FIXED_1-exp); \
131 extern unsigned long total_forks;
132 extern int nr_threads;
133 DECLARE_PER_CPU(unsigned long, process_counts);
134 extern int nr_processes(void);
135 extern unsigned long nr_running(void);
136 extern unsigned long nr_uninterruptible(void);
137 extern unsigned long nr_active(void);
138 extern unsigned long nr_iowait(void);
143 #ifdef CONFIG_SCHED_DEBUG
144 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
145 extern void proc_sched_set_task(struct task_struct *p);
147 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
150 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
153 static inline void proc_sched_set_task(struct task_struct *p)
157 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
162 extern unsigned long long time_sync_thresh;
165 * Task state bitmask. NOTE! These bits are also
166 * encoded in fs/proc/array.c: get_task_state().
168 * We have two separate sets of flags: task->state
169 * is about runnability, while task->exit_state are
170 * about the task exiting. Confusing, but this way
171 * modifying one set can't modify the other one by
174 #define TASK_RUNNING 0
175 #define TASK_INTERRUPTIBLE 1
176 #define TASK_UNINTERRUPTIBLE 2
177 #define __TASK_STOPPED 4
178 #define __TASK_TRACED 8
179 /* in tsk->exit_state */
180 #define EXIT_ZOMBIE 16
182 /* in tsk->state again */
184 #define TASK_WAKEKILL 128
186 /* Convenience macros for the sake of set_task_state */
187 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
188 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
189 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
191 /* Convenience macros for the sake of wake_up */
192 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
193 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
195 /* get_task_state() */
196 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
197 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
200 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
201 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
202 #define task_is_stopped_or_traced(task) \
203 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
204 #define task_contributes_to_load(task) \
205 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
207 #define __set_task_state(tsk, state_value) \
208 do { (tsk)->state = (state_value); } while (0)
209 #define set_task_state(tsk, state_value) \
210 set_mb((tsk)->state, (state_value))
213 * set_current_state() includes a barrier so that the write of current->state
214 * is correctly serialised wrt the caller's subsequent test of whether to
217 * set_current_state(TASK_UNINTERRUPTIBLE);
218 * if (do_i_need_to_sleep())
221 * If the caller does not need such serialisation then use __set_current_state()
223 #define __set_current_state(state_value) \
224 do { current->state = (state_value); } while (0)
225 #define set_current_state(state_value) \
226 set_mb(current->state, (state_value))
228 /* Task command name length */
229 #define TASK_COMM_LEN 16
231 #include <linux/spinlock.h>
234 * This serializes "schedule()" and also protects
235 * the run-queue from deletions/modifications (but
236 * _adding_ to the beginning of the run-queue has
239 extern rwlock_t tasklist_lock;
240 extern spinlock_t mmlist_lock;
244 extern void sched_init(void);
245 extern void sched_init_smp(void);
246 extern asmlinkage void schedule_tail(struct task_struct *prev);
247 extern void init_idle(struct task_struct *idle, int cpu);
248 extern void init_idle_bootup_task(struct task_struct *idle);
250 extern int runqueue_is_locked(void);
251 extern void task_rq_unlock_wait(struct task_struct *p);
253 extern cpumask_var_t nohz_cpu_mask;
254 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
255 extern int select_nohz_load_balancer(int cpu);
257 static inline int select_nohz_load_balancer(int cpu)
264 * Only dump TASK_* tasks. (0 for all tasks)
266 extern void show_state_filter(unsigned long state_filter);
268 static inline void show_state(void)
270 show_state_filter(0);
273 extern void show_regs(struct pt_regs *);
276 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
277 * task), SP is the stack pointer of the first frame that should be shown in the back
278 * trace (or NULL if the entire call-chain of the task should be shown).
280 extern void show_stack(struct task_struct *task, unsigned long *sp);
282 void io_schedule(void);
283 long io_schedule_timeout(long timeout);
285 extern void cpu_init (void);
286 extern void trap_init(void);
287 extern void account_process_tick(struct task_struct *task, int user);
288 extern void update_process_times(int user);
289 extern void scheduler_tick(void);
291 extern void sched_show_task(struct task_struct *p);
293 #ifdef CONFIG_DETECT_SOFTLOCKUP
294 extern void softlockup_tick(void);
295 extern void touch_softlockup_watchdog(void);
296 extern void touch_all_softlockup_watchdogs(void);
297 extern unsigned int softlockup_panic;
298 extern unsigned long sysctl_hung_task_check_count;
299 extern unsigned long sysctl_hung_task_timeout_secs;
300 extern unsigned long sysctl_hung_task_warnings;
301 extern int softlockup_thresh;
303 static inline void softlockup_tick(void)
306 static inline void spawn_softlockup_task(void)
309 static inline void touch_softlockup_watchdog(void)
312 static inline void touch_all_softlockup_watchdogs(void)
318 /* Attach to any functions which should be ignored in wchan output. */
319 #define __sched __attribute__((__section__(".sched.text")))
321 /* Linker adds these: start and end of __sched functions */
322 extern char __sched_text_start[], __sched_text_end[];
324 /* Is this address in the __sched functions? */
325 extern int in_sched_functions(unsigned long addr);
327 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
328 extern signed long schedule_timeout(signed long timeout);
329 extern signed long schedule_timeout_interruptible(signed long timeout);
330 extern signed long schedule_timeout_killable(signed long timeout);
331 extern signed long schedule_timeout_uninterruptible(signed long timeout);
332 asmlinkage void schedule(void);
335 struct user_namespace;
337 /* Maximum number of active map areas.. This is a random (large) number */
338 #define DEFAULT_MAX_MAP_COUNT 65536
340 extern int sysctl_max_map_count;
342 #include <linux/aio.h>
345 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
346 unsigned long, unsigned long);
348 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
349 unsigned long len, unsigned long pgoff,
350 unsigned long flags);
351 extern void arch_unmap_area(struct mm_struct *, unsigned long);
352 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
354 #if USE_SPLIT_PTLOCKS
356 * The mm counters are not protected by its page_table_lock,
357 * so must be incremented atomically.
359 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
360 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
361 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
362 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
363 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
365 #else /* !USE_SPLIT_PTLOCKS */
367 * The mm counters are protected by its page_table_lock,
368 * so can be incremented directly.
370 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
371 #define get_mm_counter(mm, member) ((mm)->_##member)
372 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
373 #define inc_mm_counter(mm, member) (mm)->_##member++
374 #define dec_mm_counter(mm, member) (mm)->_##member--
376 #endif /* !USE_SPLIT_PTLOCKS */
378 #define get_mm_rss(mm) \
379 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
380 #define update_hiwater_rss(mm) do { \
381 unsigned long _rss = get_mm_rss(mm); \
382 if ((mm)->hiwater_rss < _rss) \
383 (mm)->hiwater_rss = _rss; \
385 #define update_hiwater_vm(mm) do { \
386 if ((mm)->hiwater_vm < (mm)->total_vm) \
387 (mm)->hiwater_vm = (mm)->total_vm; \
390 extern void set_dumpable(struct mm_struct *mm, int value);
391 extern int get_dumpable(struct mm_struct *mm);
395 #define MMF_DUMPABLE 0 /* core dump is permitted */
396 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
397 #define MMF_DUMPABLE_BITS 2
399 /* coredump filter bits */
400 #define MMF_DUMP_ANON_PRIVATE 2
401 #define MMF_DUMP_ANON_SHARED 3
402 #define MMF_DUMP_MAPPED_PRIVATE 4
403 #define MMF_DUMP_MAPPED_SHARED 5
404 #define MMF_DUMP_ELF_HEADERS 6
405 #define MMF_DUMP_HUGETLB_PRIVATE 7
406 #define MMF_DUMP_HUGETLB_SHARED 8
407 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
408 #define MMF_DUMP_FILTER_BITS 7
409 #define MMF_DUMP_FILTER_MASK \
410 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
411 #define MMF_DUMP_FILTER_DEFAULT \
412 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
413 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
415 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
416 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
418 # define MMF_DUMP_MASK_DEFAULT_ELF 0
421 struct sighand_struct {
423 struct k_sigaction action[_NSIG];
425 wait_queue_head_t signalfd_wqh;
428 struct pacct_struct {
431 unsigned long ac_mem;
432 cputime_t ac_utime, ac_stime;
433 unsigned long ac_minflt, ac_majflt;
437 * struct task_cputime - collected CPU time counts
438 * @utime: time spent in user mode, in &cputime_t units
439 * @stime: time spent in kernel mode, in &cputime_t units
440 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
442 * This structure groups together three kinds of CPU time that are
443 * tracked for threads and thread groups. Most things considering
444 * CPU time want to group these counts together and treat all three
445 * of them in parallel.
447 struct task_cputime {
450 unsigned long long sum_exec_runtime;
452 /* Alternate field names when used to cache expirations. */
453 #define prof_exp stime
454 #define virt_exp utime
455 #define sched_exp sum_exec_runtime
458 * struct thread_group_cputime - thread group interval timer counts
459 * @totals: thread group interval timers; substructure for
460 * uniprocessor kernel, per-cpu for SMP kernel.
462 * This structure contains the version of task_cputime, above, that is
463 * used for thread group CPU clock calculations.
465 struct thread_group_cputime {
466 struct task_cputime *totals;
470 * NOTE! "signal_struct" does not have it's own
471 * locking, because a shared signal_struct always
472 * implies a shared sighand_struct, so locking
473 * sighand_struct is always a proper superset of
474 * the locking of signal_struct.
476 struct signal_struct {
480 wait_queue_head_t wait_chldexit; /* for wait4() */
482 /* current thread group signal load-balancing target: */
483 struct task_struct *curr_target;
485 /* shared signal handling: */
486 struct sigpending shared_pending;
488 /* thread group exit support */
491 * - notify group_exit_task when ->count is equal to notify_count
492 * - everyone except group_exit_task is stopped during signal delivery
493 * of fatal signals, group_exit_task processes the signal.
496 struct task_struct *group_exit_task;
498 /* thread group stop support, overloads group_exit_code too */
499 int group_stop_count;
500 unsigned int flags; /* see SIGNAL_* flags below */
502 /* POSIX.1b Interval Timers */
503 struct list_head posix_timers;
505 /* ITIMER_REAL timer for the process */
506 struct hrtimer real_timer;
507 struct pid *leader_pid;
508 ktime_t it_real_incr;
510 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
511 cputime_t it_prof_expires, it_virt_expires;
512 cputime_t it_prof_incr, it_virt_incr;
515 * Thread group totals for process CPU clocks.
516 * See thread_group_cputime(), et al, for details.
518 struct thread_group_cputime cputime;
520 /* Earliest-expiration cache. */
521 struct task_cputime cputime_expires;
523 struct list_head cpu_timers[3];
525 /* job control IDs */
528 * pgrp and session fields are deprecated.
529 * use the task_session_Xnr and task_pgrp_Xnr routines below
533 pid_t pgrp __deprecated;
537 struct pid *tty_old_pgrp;
540 pid_t session __deprecated;
544 /* boolean value for session group leader */
547 struct tty_struct *tty; /* NULL if no tty */
550 * Cumulative resource counters for dead threads in the group,
551 * and for reaped dead child processes forked by this group.
552 * Live threads maintain their own counters and add to these
553 * in __exit_signal, except for the group leader.
555 cputime_t cutime, cstime;
558 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
559 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
560 unsigned long inblock, oublock, cinblock, coublock;
561 struct task_io_accounting ioac;
564 * We don't bother to synchronize most readers of this at all,
565 * because there is no reader checking a limit that actually needs
566 * to get both rlim_cur and rlim_max atomically, and either one
567 * alone is a single word that can safely be read normally.
568 * getrlimit/setrlimit use task_lock(current->group_leader) to
569 * protect this instead of the siglock, because they really
570 * have no need to disable irqs.
572 struct rlimit rlim[RLIM_NLIMITS];
574 /* keep the process-shared keyrings here so that they do the right
575 * thing in threads created with CLONE_THREAD */
577 struct key *session_keyring; /* keyring inherited over fork */
578 struct key *process_keyring; /* keyring private to this process */
580 #ifdef CONFIG_BSD_PROCESS_ACCT
581 struct pacct_struct pacct; /* per-process accounting information */
583 #ifdef CONFIG_TASKSTATS
584 struct taskstats *stats;
588 struct tty_audit_buf *tty_audit_buf;
592 /* Context switch must be unlocked if interrupts are to be enabled */
593 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
594 # define __ARCH_WANT_UNLOCKED_CTXSW
598 * Bits in flags field of signal_struct.
600 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
601 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
602 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
603 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
605 * Pending notifications to parent.
607 #define SIGNAL_CLD_STOPPED 0x00000010
608 #define SIGNAL_CLD_CONTINUED 0x00000020
609 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
611 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
613 /* If true, all threads except ->group_exit_task have pending SIGKILL */
614 static inline int signal_group_exit(const struct signal_struct *sig)
616 return (sig->flags & SIGNAL_GROUP_EXIT) ||
617 (sig->group_exit_task != NULL);
621 * Some day this will be a full-fledged user tracking system..
624 atomic_t __count; /* reference count */
625 atomic_t processes; /* How many processes does this user have? */
626 atomic_t files; /* How many open files does this user have? */
627 atomic_t sigpending; /* How many pending signals does this user have? */
628 #ifdef CONFIG_INOTIFY_USER
629 atomic_t inotify_watches; /* How many inotify watches does this user have? */
630 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
633 atomic_t epoll_devs; /* The number of epoll descriptors currently open */
634 atomic_t epoll_watches; /* The number of file descriptors currently watched */
636 #ifdef CONFIG_POSIX_MQUEUE
637 /* protected by mq_lock */
638 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
640 unsigned long locked_shm; /* How many pages of mlocked shm ? */
643 struct key *uid_keyring; /* UID specific keyring */
644 struct key *session_keyring; /* UID's default session keyring */
647 /* Hash table maintenance information */
648 struct hlist_node uidhash_node;
651 #ifdef CONFIG_USER_SCHED
652 struct task_group *tg;
655 struct work_struct work;
660 extern int uids_sysfs_init(void);
662 extern struct user_struct *find_user(uid_t);
664 extern struct user_struct root_user;
665 #define INIT_USER (&root_user)
667 struct backing_dev_info;
668 struct reclaim_state;
670 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
672 /* cumulative counters */
673 unsigned long pcount; /* # of times run on this cpu */
674 unsigned long long cpu_time, /* time spent on the cpu */
675 run_delay; /* time spent waiting on a runqueue */
678 unsigned long long last_arrival,/* when we last ran on a cpu */
679 last_queued; /* when we were last queued to run */
680 #ifdef CONFIG_SCHEDSTATS
682 unsigned int bkl_count;
685 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
687 #ifdef CONFIG_TASK_DELAY_ACCT
688 struct task_delay_info {
690 unsigned int flags; /* Private per-task flags */
692 /* For each stat XXX, add following, aligned appropriately
694 * struct timespec XXX_start, XXX_end;
698 * Atomicity of updates to XXX_delay, XXX_count protected by
699 * single lock above (split into XXX_lock if contention is an issue).
703 * XXX_count is incremented on every XXX operation, the delay
704 * associated with the operation is added to XXX_delay.
705 * XXX_delay contains the accumulated delay time in nanoseconds.
707 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
708 u64 blkio_delay; /* wait for sync block io completion */
709 u64 swapin_delay; /* wait for swapin block io completion */
710 u32 blkio_count; /* total count of the number of sync block */
711 /* io operations performed */
712 u32 swapin_count; /* total count of the number of swapin block */
713 /* io operations performed */
715 struct timespec freepages_start, freepages_end;
716 u64 freepages_delay; /* wait for memory reclaim */
717 u32 freepages_count; /* total count of memory reclaim */
719 #endif /* CONFIG_TASK_DELAY_ACCT */
721 static inline int sched_info_on(void)
723 #ifdef CONFIG_SCHEDSTATS
725 #elif defined(CONFIG_TASK_DELAY_ACCT)
726 extern int delayacct_on;
741 * sched-domains (multiprocessor balancing) declarations:
745 * Increase resolution of nice-level calculations:
747 #define SCHED_LOAD_SHIFT 10
748 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
750 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
753 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
754 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
755 #define SD_BALANCE_EXEC 4 /* Balance on exec */
756 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
757 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
758 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
759 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
760 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
761 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
762 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
763 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
764 #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
766 enum powersavings_balance_level {
767 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */
768 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package
769 * first for long running threads
771 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle
772 * cpu package for power savings
774 MAX_POWERSAVINGS_BALANCE_LEVELS
777 extern int sched_mc_power_savings, sched_smt_power_savings;
779 static inline int sd_balance_for_mc_power(void)
781 if (sched_smt_power_savings)
782 return SD_POWERSAVINGS_BALANCE;
787 static inline int sd_balance_for_package_power(void)
789 if (sched_mc_power_savings | sched_smt_power_savings)
790 return SD_POWERSAVINGS_BALANCE;
796 * Optimise SD flags for power savings:
797 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
798 * Keep default SD flags if sched_{smt,mc}_power_saving=0
801 static inline int sd_power_saving_flags(void)
803 if (sched_mc_power_savings | sched_smt_power_savings)
804 return SD_BALANCE_NEWIDLE;
810 struct sched_group *next; /* Must be a circular list */
813 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
814 * single CPU. This is read only (except for setup, hotplug CPU).
815 * Note : Never change cpu_power without recompute its reciprocal
817 unsigned int __cpu_power;
819 * reciprocal value of cpu_power to avoid expensive divides
820 * (see include/linux/reciprocal_div.h)
822 u32 reciprocal_cpu_power;
824 unsigned long cpumask[];
827 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
829 return to_cpumask(sg->cpumask);
832 enum sched_domain_level {
842 struct sched_domain_attr {
843 int relax_domain_level;
846 #define SD_ATTR_INIT (struct sched_domain_attr) { \
847 .relax_domain_level = -1, \
850 struct sched_domain {
851 /* These fields must be setup */
852 struct sched_domain *parent; /* top domain must be null terminated */
853 struct sched_domain *child; /* bottom domain must be null terminated */
854 struct sched_group *groups; /* the balancing groups of the domain */
855 unsigned long min_interval; /* Minimum balance interval ms */
856 unsigned long max_interval; /* Maximum balance interval ms */
857 unsigned int busy_factor; /* less balancing by factor if busy */
858 unsigned int imbalance_pct; /* No balance until over watermark */
859 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
860 unsigned int busy_idx;
861 unsigned int idle_idx;
862 unsigned int newidle_idx;
863 unsigned int wake_idx;
864 unsigned int forkexec_idx;
865 int flags; /* See SD_* */
866 enum sched_domain_level level;
868 /* Runtime fields. */
869 unsigned long last_balance; /* init to jiffies. units in jiffies */
870 unsigned int balance_interval; /* initialise to 1. units in ms. */
871 unsigned int nr_balance_failed; /* initialise to 0 */
875 #ifdef CONFIG_SCHEDSTATS
876 /* load_balance() stats */
877 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
878 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
879 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
880 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
881 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
882 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
883 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
884 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
886 /* Active load balancing */
887 unsigned int alb_count;
888 unsigned int alb_failed;
889 unsigned int alb_pushed;
891 /* SD_BALANCE_EXEC stats */
892 unsigned int sbe_count;
893 unsigned int sbe_balanced;
894 unsigned int sbe_pushed;
896 /* SD_BALANCE_FORK stats */
897 unsigned int sbf_count;
898 unsigned int sbf_balanced;
899 unsigned int sbf_pushed;
901 /* try_to_wake_up() stats */
902 unsigned int ttwu_wake_remote;
903 unsigned int ttwu_move_affine;
904 unsigned int ttwu_move_balance;
906 #ifdef CONFIG_SCHED_DEBUG
910 /* span of all CPUs in this domain */
911 unsigned long span[];
914 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
916 return to_cpumask(sd->span);
919 extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
920 struct sched_domain_attr *dattr_new);
921 extern int arch_reinit_sched_domains(void);
923 /* Test a flag in parent sched domain */
924 static inline int test_sd_parent(struct sched_domain *sd, int flag)
926 if (sd->parent && (sd->parent->flags & flag))
932 #else /* CONFIG_SMP */
934 struct sched_domain_attr;
937 partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
938 struct sched_domain_attr *dattr_new)
941 #endif /* !CONFIG_SMP */
943 struct io_context; /* See blkdev.h */
944 #define NGROUPS_SMALL 32
945 #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
949 gid_t small_block[NGROUPS_SMALL];
955 * get_group_info() must be called with the owning task locked (via task_lock())
956 * when task != current. The reason being that the vast majority of callers are
957 * looking at current->group_info, which can not be changed except by the
958 * current task. Changing current->group_info requires the task lock, too.
960 #define get_group_info(group_info) do { \
961 atomic_inc(&(group_info)->usage); \
964 #define put_group_info(group_info) do { \
965 if (atomic_dec_and_test(&(group_info)->usage)) \
966 groups_free(group_info); \
969 extern struct group_info *groups_alloc(int gidsetsize);
970 extern void groups_free(struct group_info *group_info);
971 extern int set_current_groups(struct group_info *group_info);
972 extern int groups_search(struct group_info *group_info, gid_t grp);
973 /* access the groups "array" with this macro */
974 #define GROUP_AT(gi, i) \
975 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
977 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
978 extern void prefetch_stack(struct task_struct *t);
980 static inline void prefetch_stack(struct task_struct *t) { }
983 struct audit_context; /* See audit.c */
985 struct pipe_inode_info;
986 struct uts_namespace;
992 const struct sched_class *next;
994 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
995 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
996 void (*yield_task) (struct rq *rq);
998 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
1000 struct task_struct * (*pick_next_task) (struct rq *rq);
1001 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
1004 int (*select_task_rq)(struct task_struct *p, int sync);
1006 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
1007 struct rq *busiest, unsigned long max_load_move,
1008 struct sched_domain *sd, enum cpu_idle_type idle,
1009 int *all_pinned, int *this_best_prio);
1011 int (*move_one_task) (struct rq *this_rq, int this_cpu,
1012 struct rq *busiest, struct sched_domain *sd,
1013 enum cpu_idle_type idle);
1014 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1015 int (*needs_post_schedule) (struct rq *this_rq);
1016 void (*post_schedule) (struct rq *this_rq);
1017 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
1019 void (*set_cpus_allowed)(struct task_struct *p,
1020 const struct cpumask *newmask);
1022 void (*rq_online)(struct rq *rq);
1023 void (*rq_offline)(struct rq *rq);
1026 void (*set_curr_task) (struct rq *rq);
1027 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1028 void (*task_new) (struct rq *rq, struct task_struct *p);
1030 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
1032 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
1034 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1035 int oldprio, int running);
1037 #ifdef CONFIG_FAIR_GROUP_SCHED
1038 void (*moved_group) (struct task_struct *p);
1042 struct load_weight {
1043 unsigned long weight, inv_weight;
1047 * CFS stats for a schedulable entity (task, task-group etc)
1049 * Current field usage histogram:
1056 struct sched_entity {
1057 struct load_weight load; /* for load-balancing */
1058 struct rb_node run_node;
1059 struct list_head group_node;
1063 u64 sum_exec_runtime;
1065 u64 prev_sum_exec_runtime;
1070 #ifdef CONFIG_SCHEDSTATS
1078 s64 sum_sleep_runtime;
1086 u64 nr_migrations_cold;
1087 u64 nr_failed_migrations_affine;
1088 u64 nr_failed_migrations_running;
1089 u64 nr_failed_migrations_hot;
1090 u64 nr_forced_migrations;
1091 u64 nr_forced2_migrations;
1094 u64 nr_wakeups_sync;
1095 u64 nr_wakeups_migrate;
1096 u64 nr_wakeups_local;
1097 u64 nr_wakeups_remote;
1098 u64 nr_wakeups_affine;
1099 u64 nr_wakeups_affine_attempts;
1100 u64 nr_wakeups_passive;
1101 u64 nr_wakeups_idle;
1104 #ifdef CONFIG_FAIR_GROUP_SCHED
1105 struct sched_entity *parent;
1106 /* rq on which this entity is (to be) queued: */
1107 struct cfs_rq *cfs_rq;
1108 /* rq "owned" by this entity/group: */
1109 struct cfs_rq *my_q;
1113 struct sched_rt_entity {
1114 struct list_head run_list;
1115 unsigned long timeout;
1116 unsigned int time_slice;
1117 int nr_cpus_allowed;
1119 struct sched_rt_entity *back;
1120 #ifdef CONFIG_RT_GROUP_SCHED
1121 struct sched_rt_entity *parent;
1122 /* rq on which this entity is (to be) queued: */
1123 struct rt_rq *rt_rq;
1124 /* rq "owned" by this entity/group: */
1129 struct task_struct {
1130 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1133 unsigned int flags; /* per process flags, defined below */
1134 unsigned int ptrace;
1136 int lock_depth; /* BKL lock depth */
1139 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1144 int prio, static_prio, normal_prio;
1145 unsigned int rt_priority;
1146 const struct sched_class *sched_class;
1147 struct sched_entity se;
1148 struct sched_rt_entity rt;
1150 #ifdef CONFIG_PREEMPT_NOTIFIERS
1151 /* list of struct preempt_notifier: */
1152 struct hlist_head preempt_notifiers;
1156 * fpu_counter contains the number of consecutive context switches
1157 * that the FPU is used. If this is over a threshold, the lazy fpu
1158 * saving becomes unlazy to save the trap. This is an unsigned char
1159 * so that after 256 times the counter wraps and the behavior turns
1160 * lazy again; this to deal with bursty apps that only use FPU for
1163 unsigned char fpu_counter;
1164 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
1165 #ifdef CONFIG_BLK_DEV_IO_TRACE
1166 unsigned int btrace_seq;
1169 unsigned int policy;
1170 cpumask_t cpus_allowed;
1172 #ifdef CONFIG_PREEMPT_RCU
1173 int rcu_read_lock_nesting;
1174 int rcu_flipctr_idx;
1175 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1177 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1178 struct sched_info sched_info;
1181 struct list_head tasks;
1182 struct plist_node pushable_tasks;
1184 struct mm_struct *mm, *active_mm;
1187 struct linux_binfmt *binfmt;
1189 int exit_code, exit_signal;
1190 int pdeath_signal; /* The signal sent when the parent dies */
1192 unsigned int personality;
1193 unsigned did_exec:1;
1197 #ifdef CONFIG_CC_STACKPROTECTOR
1198 /* Canary value for the -fstack-protector gcc feature */
1199 unsigned long stack_canary;
1202 * pointers to (original) parent process, youngest child, younger sibling,
1203 * older sibling, respectively. (p->father can be replaced with
1204 * p->real_parent->pid)
1206 struct task_struct *real_parent; /* real parent process */
1207 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1209 * children/sibling forms the list of my natural children
1211 struct list_head children; /* list of my children */
1212 struct list_head sibling; /* linkage in my parent's children list */
1213 struct task_struct *group_leader; /* threadgroup leader */
1216 * ptraced is the list of tasks this task is using ptrace on.
1217 * This includes both natural children and PTRACE_ATTACH targets.
1218 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1220 struct list_head ptraced;
1221 struct list_head ptrace_entry;
1223 #ifdef CONFIG_X86_PTRACE_BTS
1225 * This is the tracer handle for the ptrace BTS extension.
1226 * This field actually belongs to the ptracer task.
1228 struct bts_tracer *bts;
1230 * The buffer to hold the BTS data.
1233 #endif /* CONFIG_X86_PTRACE_BTS */
1235 /* PID/PID hash table linkage. */
1236 struct pid_link pids[PIDTYPE_MAX];
1237 struct list_head thread_group;
1239 struct completion *vfork_done; /* for vfork() */
1240 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1241 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1243 cputime_t utime, stime, utimescaled, stimescaled;
1245 cputime_t prev_utime, prev_stime;
1246 unsigned long nvcsw, nivcsw; /* context switch counts */
1247 struct timespec start_time; /* monotonic time */
1248 struct timespec real_start_time; /* boot based time */
1249 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1250 unsigned long min_flt, maj_flt;
1252 struct task_cputime cputime_expires;
1253 struct list_head cpu_timers[3];
1255 /* process credentials */
1256 uid_t uid,euid,suid,fsuid;
1257 gid_t gid,egid,sgid,fsgid;
1258 struct group_info *group_info;
1259 kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset;
1260 struct user_struct *user;
1261 unsigned securebits;
1263 unsigned char jit_keyring; /* default keyring to attach requested keys to */
1264 struct key *request_key_auth; /* assumed request_key authority */
1265 struct key *thread_keyring; /* keyring private to this thread */
1267 char comm[TASK_COMM_LEN]; /* executable name excluding path
1268 - access with [gs]et_task_comm (which lock
1269 it with task_lock())
1270 - initialized normally by flush_old_exec */
1271 /* file system info */
1272 int link_count, total_link_count;
1273 #ifdef CONFIG_SYSVIPC
1275 struct sysv_sem sysvsem;
1277 #ifdef CONFIG_DETECT_SOFTLOCKUP
1278 /* hung task detection */
1279 unsigned long last_switch_timestamp;
1280 unsigned long last_switch_count;
1282 /* CPU-specific state of this task */
1283 struct thread_struct thread;
1284 /* filesystem information */
1285 struct fs_struct *fs;
1286 /* open file information */
1287 struct files_struct *files;
1289 struct nsproxy *nsproxy;
1290 /* signal handlers */
1291 struct signal_struct *signal;
1292 struct sighand_struct *sighand;
1294 sigset_t blocked, real_blocked;
1295 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1296 struct sigpending pending;
1298 unsigned long sas_ss_sp;
1300 int (*notifier)(void *priv);
1301 void *notifier_data;
1302 sigset_t *notifier_mask;
1303 #ifdef CONFIG_SECURITY
1306 struct audit_context *audit_context;
1307 #ifdef CONFIG_AUDITSYSCALL
1309 unsigned int sessionid;
1313 /* Thread group tracking */
1316 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1317 spinlock_t alloc_lock;
1319 /* Protection of the PI data structures: */
1322 #ifdef CONFIG_RT_MUTEXES
1323 /* PI waiters blocked on a rt_mutex held by this task */
1324 struct plist_head pi_waiters;
1325 /* Deadlock detection and priority inheritance handling */
1326 struct rt_mutex_waiter *pi_blocked_on;
1329 #ifdef CONFIG_DEBUG_MUTEXES
1330 /* mutex deadlock detection */
1331 struct mutex_waiter *blocked_on;
1333 #ifdef CONFIG_TRACE_IRQFLAGS
1334 unsigned int irq_events;
1335 int hardirqs_enabled;
1336 unsigned long hardirq_enable_ip;
1337 unsigned int hardirq_enable_event;
1338 unsigned long hardirq_disable_ip;
1339 unsigned int hardirq_disable_event;
1340 int softirqs_enabled;
1341 unsigned long softirq_disable_ip;
1342 unsigned int softirq_disable_event;
1343 unsigned long softirq_enable_ip;
1344 unsigned int softirq_enable_event;
1345 int hardirq_context;
1346 int softirq_context;
1348 #ifdef CONFIG_LOCKDEP
1349 # define MAX_LOCK_DEPTH 48UL
1352 unsigned int lockdep_recursion;
1353 struct held_lock held_locks[MAX_LOCK_DEPTH];
1356 /* journalling filesystem info */
1359 /* stacked block device info */
1360 struct bio *bio_list, **bio_tail;
1363 struct reclaim_state *reclaim_state;
1365 struct backing_dev_info *backing_dev_info;
1367 struct io_context *io_context;
1369 unsigned long ptrace_message;
1370 siginfo_t *last_siginfo; /* For ptrace use. */
1371 struct task_io_accounting ioac;
1372 #if defined(CONFIG_TASK_XACCT)
1373 u64 acct_rss_mem1; /* accumulated rss usage */
1374 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1375 cputime_t acct_timexpd; /* stime + utime since last update */
1377 #ifdef CONFIG_CPUSETS
1378 nodemask_t mems_allowed;
1379 int cpuset_mems_generation;
1380 int cpuset_mem_spread_rotor;
1382 #ifdef CONFIG_CGROUPS
1383 /* Control Group info protected by css_set_lock */
1384 struct css_set *cgroups;
1385 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1386 struct list_head cg_list;
1389 struct robust_list_head __user *robust_list;
1390 #ifdef CONFIG_COMPAT
1391 struct compat_robust_list_head __user *compat_robust_list;
1393 struct list_head pi_state_list;
1394 struct futex_pi_state *pi_state_cache;
1397 struct mempolicy *mempolicy;
1400 atomic_t fs_excl; /* holding fs exclusive resources */
1401 struct rcu_head rcu;
1404 * cache last used pipe for splice
1406 struct pipe_inode_info *splice_pipe;
1407 #ifdef CONFIG_TASK_DELAY_ACCT
1408 struct task_delay_info *delays;
1410 #ifdef CONFIG_FAULT_INJECTION
1413 struct prop_local_single dirties;
1414 #ifdef CONFIG_LATENCYTOP
1415 int latency_record_count;
1416 struct latency_record latency_record[LT_SAVECOUNT];
1419 * time slack values; these are used to round up poll() and
1420 * select() etc timeout values. These are in nanoseconds.
1422 unsigned long timer_slack_ns;
1423 unsigned long default_timer_slack_ns;
1425 struct list_head *scm_work_list;
1426 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1427 /* Index of current stored adress in ret_stack */
1429 /* Stack of return addresses for return function tracing */
1430 struct ftrace_ret_stack *ret_stack;
1432 * Number of functions that haven't been traced
1433 * because of depth overrun.
1435 atomic_t trace_overrun;
1436 /* Pause for the tracing */
1437 atomic_t tracing_graph_pause;
1439 #ifdef CONFIG_TRACING
1440 /* state flags for use by tracers */
1441 unsigned long trace;
1446 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1447 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1448 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1449 * values are inverted: lower p->prio value means higher priority.
1451 * The MAX_USER_RT_PRIO value allows the actual maximum
1452 * RT priority to be separate from the value exported to
1453 * user-space. This allows kernel threads to set their
1454 * priority to a value higher than any user task. Note:
1455 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1458 #define MAX_USER_RT_PRIO 100
1459 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1461 #define MAX_PRIO (MAX_RT_PRIO + 40)
1462 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1464 static inline int rt_prio(int prio)
1466 if (unlikely(prio < MAX_RT_PRIO))
1471 static inline int rt_task(struct task_struct *p)
1473 return rt_prio(p->prio);
1476 static inline void set_task_session(struct task_struct *tsk, pid_t session)
1478 tsk->signal->__session = session;
1481 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1483 tsk->signal->__pgrp = pgrp;
1486 static inline struct pid *task_pid(struct task_struct *task)
1488 return task->pids[PIDTYPE_PID].pid;
1491 static inline struct pid *task_tgid(struct task_struct *task)
1493 return task->group_leader->pids[PIDTYPE_PID].pid;
1496 static inline struct pid *task_pgrp(struct task_struct *task)
1498 return task->group_leader->pids[PIDTYPE_PGID].pid;
1501 static inline struct pid *task_session(struct task_struct *task)
1503 return task->group_leader->pids[PIDTYPE_SID].pid;
1506 struct pid_namespace;
1509 * the helpers to get the task's different pids as they are seen
1510 * from various namespaces
1512 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1513 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1515 * task_xid_nr_ns() : id seen from the ns specified;
1517 * set_task_vxid() : assigns a virtual id to a task;
1519 * see also pid_nr() etc in include/linux/pid.h
1522 static inline pid_t task_pid_nr(struct task_struct *tsk)
1527 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1529 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1531 return pid_vnr(task_pid(tsk));
1535 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1540 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1542 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1544 return pid_vnr(task_tgid(tsk));
1548 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1550 return tsk->signal->__pgrp;
1553 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1555 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1557 return pid_vnr(task_pgrp(tsk));
1561 static inline pid_t task_session_nr(struct task_struct *tsk)
1563 return tsk->signal->__session;
1566 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1568 static inline pid_t task_session_vnr(struct task_struct *tsk)
1570 return pid_vnr(task_session(tsk));
1575 * pid_alive - check that a task structure is not stale
1576 * @p: Task structure to be checked.
1578 * Test if a process is not yet dead (at most zombie state)
1579 * If pid_alive fails, then pointers within the task structure
1580 * can be stale and must not be dereferenced.
1582 static inline int pid_alive(struct task_struct *p)
1584 return p->pids[PIDTYPE_PID].pid != NULL;
1588 * is_global_init - check if a task structure is init
1589 * @tsk: Task structure to be checked.
1591 * Check if a task structure is the first user space task the kernel created.
1593 static inline int is_global_init(struct task_struct *tsk)
1595 return tsk->pid == 1;
1599 * is_container_init:
1600 * check whether in the task is init in its own pid namespace.
1602 extern int is_container_init(struct task_struct *tsk);
1604 extern struct pid *cad_pid;
1606 extern void free_task(struct task_struct *tsk);
1607 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1609 extern void __put_task_struct(struct task_struct *t);
1611 static inline void put_task_struct(struct task_struct *t)
1613 if (atomic_dec_and_test(&t->usage))
1614 __put_task_struct(t);
1617 extern cputime_t task_utime(struct task_struct *p);
1618 extern cputime_t task_stime(struct task_struct *p);
1619 extern cputime_t task_gtime(struct task_struct *p);
1624 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1625 /* Not implemented yet, only for 486*/
1626 #define PF_STARTING 0x00000002 /* being created */
1627 #define PF_EXITING 0x00000004 /* getting shut down */
1628 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1629 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1630 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1631 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1632 #define PF_DUMPCORE 0x00000200 /* dumped core */
1633 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1634 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1635 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1636 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1637 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1638 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1639 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1640 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1641 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1642 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1643 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1644 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1645 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1646 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1647 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1648 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1649 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1650 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1651 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1652 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1655 * Only the _current_ task can read/write to tsk->flags, but other
1656 * tasks can access tsk->flags in readonly mode for example
1657 * with tsk_used_math (like during threaded core dumping).
1658 * There is however an exception to this rule during ptrace
1659 * or during fork: the ptracer task is allowed to write to the
1660 * child->flags of its traced child (same goes for fork, the parent
1661 * can write to the child->flags), because we're guaranteed the
1662 * child is not running and in turn not changing child->flags
1663 * at the same time the parent does it.
1665 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1666 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1667 #define clear_used_math() clear_stopped_child_used_math(current)
1668 #define set_used_math() set_stopped_child_used_math(current)
1669 #define conditional_stopped_child_used_math(condition, child) \
1670 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1671 #define conditional_used_math(condition) \
1672 conditional_stopped_child_used_math(condition, current)
1673 #define copy_to_stopped_child_used_math(child) \
1674 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1675 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1676 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1677 #define used_math() tsk_used_math(current)
1680 extern int set_cpus_allowed_ptr(struct task_struct *p,
1681 const struct cpumask *new_mask);
1683 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1684 const struct cpumask *new_mask)
1686 if (!cpumask_test_cpu(0, new_mask))
1691 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1693 return set_cpus_allowed_ptr(p, &new_mask);
1696 extern unsigned long long sched_clock(void);
1698 extern void sched_clock_init(void);
1699 extern u64 sched_clock_cpu(int cpu);
1701 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1702 static inline void sched_clock_tick(void)
1706 static inline void sched_clock_idle_sleep_event(void)
1710 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1714 extern void sched_clock_tick(void);
1715 extern void sched_clock_idle_sleep_event(void);
1716 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1720 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1721 * clock constructed from sched_clock():
1723 extern unsigned long long cpu_clock(int cpu);
1725 extern unsigned long long
1726 task_sched_runtime(struct task_struct *task);
1727 extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1729 /* sched_exec is called by processes performing an exec */
1731 extern void sched_exec(void);
1733 #define sched_exec() {}
1736 extern void sched_clock_idle_sleep_event(void);
1737 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1739 #ifdef CONFIG_HOTPLUG_CPU
1740 extern void idle_task_exit(void);
1742 static inline void idle_task_exit(void) {}
1745 extern void sched_idle_next(void);
1747 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1748 extern void wake_up_idle_cpu(int cpu);
1750 static inline void wake_up_idle_cpu(int cpu) { }
1753 #ifdef CONFIG_SCHED_DEBUG
1754 extern unsigned int sysctl_sched_latency;
1755 extern unsigned int sysctl_sched_min_granularity;
1756 extern unsigned int sysctl_sched_wakeup_granularity;
1757 extern unsigned int sysctl_sched_child_runs_first;
1758 extern unsigned int sysctl_sched_features;
1759 extern unsigned int sysctl_sched_migration_cost;
1760 extern unsigned int sysctl_sched_nr_migrate;
1761 extern unsigned int sysctl_sched_shares_ratelimit;
1762 extern unsigned int sysctl_sched_shares_thresh;
1764 int sched_nr_latency_handler(struct ctl_table *table, int write,
1765 struct file *file, void __user *buffer, size_t *length,
1768 extern unsigned int sysctl_sched_rt_period;
1769 extern int sysctl_sched_rt_runtime;
1771 int sched_rt_handler(struct ctl_table *table, int write,
1772 struct file *filp, void __user *buffer, size_t *lenp,
1775 extern unsigned int sysctl_sched_compat_yield;
1777 #ifdef CONFIG_RT_MUTEXES
1778 extern int rt_mutex_getprio(struct task_struct *p);
1779 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1780 extern void rt_mutex_adjust_pi(struct task_struct *p);
1782 static inline int rt_mutex_getprio(struct task_struct *p)
1784 return p->normal_prio;
1786 # define rt_mutex_adjust_pi(p) do { } while (0)
1789 extern void set_user_nice(struct task_struct *p, long nice);
1790 extern int task_prio(const struct task_struct *p);
1791 extern int task_nice(const struct task_struct *p);
1792 extern int can_nice(const struct task_struct *p, const int nice);
1793 extern int task_curr(const struct task_struct *p);
1794 extern int idle_cpu(int cpu);
1795 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1796 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1797 struct sched_param *);
1798 extern struct task_struct *idle_task(int cpu);
1799 extern struct task_struct *curr_task(int cpu);
1800 extern void set_curr_task(int cpu, struct task_struct *p);
1805 * The default (Linux) execution domain.
1807 extern struct exec_domain default_exec_domain;
1809 union thread_union {
1810 struct thread_info thread_info;
1811 unsigned long stack[THREAD_SIZE/sizeof(long)];
1814 #ifndef __HAVE_ARCH_KSTACK_END
1815 static inline int kstack_end(void *addr)
1817 /* Reliable end of stack detection:
1818 * Some APM bios versions misalign the stack
1820 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1824 extern union thread_union init_thread_union;
1825 extern struct task_struct init_task;
1827 extern struct mm_struct init_mm;
1829 extern struct pid_namespace init_pid_ns;
1832 * find a task by one of its numerical ids
1834 * find_task_by_pid_type_ns():
1835 * it is the most generic call - it finds a task by all id,
1836 * type and namespace specified
1837 * find_task_by_pid_ns():
1838 * finds a task by its pid in the specified namespace
1839 * find_task_by_vpid():
1840 * finds a task by its virtual pid
1842 * see also find_vpid() etc in include/linux/pid.h
1845 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1846 struct pid_namespace *ns);
1848 extern struct task_struct *find_task_by_vpid(pid_t nr);
1849 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1850 struct pid_namespace *ns);
1852 extern void __set_special_pids(struct pid *pid);
1854 /* per-UID process charging. */
1855 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1856 static inline struct user_struct *get_uid(struct user_struct *u)
1858 atomic_inc(&u->__count);
1861 extern void free_uid(struct user_struct *);
1862 extern void switch_uid(struct user_struct *);
1863 extern void release_uids(struct user_namespace *ns);
1865 #include <asm/current.h>
1867 extern void do_timer(unsigned long ticks);
1869 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1870 extern int wake_up_process(struct task_struct *tsk);
1871 extern void wake_up_new_task(struct task_struct *tsk,
1872 unsigned long clone_flags);
1874 extern void kick_process(struct task_struct *tsk);
1876 static inline void kick_process(struct task_struct *tsk) { }
1878 extern void sched_fork(struct task_struct *p, int clone_flags);
1879 extern void sched_dead(struct task_struct *p);
1881 extern int in_group_p(gid_t);
1882 extern int in_egroup_p(gid_t);
1884 extern void proc_caches_init(void);
1885 extern void flush_signals(struct task_struct *);
1886 extern void ignore_signals(struct task_struct *);
1887 extern void flush_signal_handlers(struct task_struct *, int force_default);
1888 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1890 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1892 unsigned long flags;
1895 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1896 ret = dequeue_signal(tsk, mask, info);
1897 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1902 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1904 extern void unblock_all_signals(void);
1905 extern void release_task(struct task_struct * p);
1906 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1907 extern int force_sigsegv(int, struct task_struct *);
1908 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1909 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1910 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1911 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1912 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1913 extern int kill_pid(struct pid *pid, int sig, int priv);
1914 extern int kill_proc_info(int, struct siginfo *, pid_t);
1915 extern int do_notify_parent(struct task_struct *, int);
1916 extern void force_sig(int, struct task_struct *);
1917 extern void force_sig_specific(int, struct task_struct *);
1918 extern int send_sig(int, struct task_struct *, int);
1919 extern void zap_other_threads(struct task_struct *p);
1920 extern struct sigqueue *sigqueue_alloc(void);
1921 extern void sigqueue_free(struct sigqueue *);
1922 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
1923 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1924 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1926 static inline int kill_cad_pid(int sig, int priv)
1928 return kill_pid(cad_pid, sig, priv);
1931 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1932 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1933 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1934 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1936 static inline int is_si_special(const struct siginfo *info)
1938 return info <= SEND_SIG_FORCED;
1941 /* True if we are on the alternate signal stack. */
1943 static inline int on_sig_stack(unsigned long sp)
1945 return (sp - current->sas_ss_sp < current->sas_ss_size);
1948 static inline int sas_ss_flags(unsigned long sp)
1950 return (current->sas_ss_size == 0 ? SS_DISABLE
1951 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1955 * Routines for handling mm_structs
1957 extern struct mm_struct * mm_alloc(void);
1959 /* mmdrop drops the mm and the page tables */
1960 extern void __mmdrop(struct mm_struct *);
1961 static inline void mmdrop(struct mm_struct * mm)
1963 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1967 /* mmput gets rid of the mappings and all user-space */
1968 extern void mmput(struct mm_struct *);
1969 /* Grab a reference to a task's mm, if it is not already going away */
1970 extern struct mm_struct *get_task_mm(struct task_struct *task);
1971 /* Remove the current tasks stale references to the old mm_struct */
1972 extern void mm_release(struct task_struct *, struct mm_struct *);
1973 /* Allocate a new mm structure and copy contents from tsk->mm */
1974 extern struct mm_struct *dup_mm(struct task_struct *tsk);
1976 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1977 extern void flush_thread(void);
1978 extern void exit_thread(void);
1980 extern void exit_files(struct task_struct *);
1981 extern void __cleanup_signal(struct signal_struct *);
1982 extern void __cleanup_sighand(struct sighand_struct *);
1984 extern void exit_itimers(struct signal_struct *);
1985 extern void flush_itimer_signals(void);
1987 extern NORET_TYPE void do_group_exit(int);
1989 extern void daemonize(const char *, ...);
1990 extern int allow_signal(int);
1991 extern int disallow_signal(int);
1993 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1994 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1995 struct task_struct *fork_idle(int);
1997 extern void set_task_comm(struct task_struct *tsk, char *from);
1998 extern char *get_task_comm(char *to, struct task_struct *tsk);
2001 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2003 static inline unsigned long wait_task_inactive(struct task_struct *p,
2010 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
2012 #define for_each_process(p) \
2013 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2016 * Careful: do_each_thread/while_each_thread is a double loop so
2017 * 'break' will not work as expected - use goto instead.
2019 #define do_each_thread(g, t) \
2020 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2022 #define while_each_thread(g, t) \
2023 while ((t = next_thread(t)) != g)
2025 /* de_thread depends on thread_group_leader not being a pid based check */
2026 #define thread_group_leader(p) (p == p->group_leader)
2028 /* Do to the insanities of de_thread it is possible for a process
2029 * to have the pid of the thread group leader without actually being
2030 * the thread group leader. For iteration through the pids in proc
2031 * all we care about is that we have a task with the appropriate
2032 * pid, we don't actually care if we have the right task.
2034 static inline int has_group_leader_pid(struct task_struct *p)
2036 return p->pid == p->tgid;
2040 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2042 return p1->tgid == p2->tgid;
2045 static inline struct task_struct *next_thread(const struct task_struct *p)
2047 return list_entry(rcu_dereference(p->thread_group.next),
2048 struct task_struct, thread_group);
2051 static inline int thread_group_empty(struct task_struct *p)
2053 return list_empty(&p->thread_group);
2056 #define delay_group_leader(p) \
2057 (thread_group_leader(p) && !thread_group_empty(p))
2060 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2061 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2062 * pins the final release of task.io_context. Also protects ->cpuset and
2063 * ->cgroup.subsys[].
2065 * Nests both inside and outside of read_lock(&tasklist_lock).
2066 * It must not be nested with write_lock_irq(&tasklist_lock),
2067 * neither inside nor outside.
2069 static inline void task_lock(struct task_struct *p)
2071 spin_lock(&p->alloc_lock);
2074 static inline void task_unlock(struct task_struct *p)
2076 spin_unlock(&p->alloc_lock);
2079 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2080 unsigned long *flags);
2082 static inline void unlock_task_sighand(struct task_struct *tsk,
2083 unsigned long *flags)
2085 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2088 #ifndef __HAVE_THREAD_FUNCTIONS
2090 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2091 #define task_stack_page(task) ((task)->stack)
2093 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2095 *task_thread_info(p) = *task_thread_info(org);
2096 task_thread_info(p)->task = p;
2099 static inline unsigned long *end_of_stack(struct task_struct *p)
2101 return (unsigned long *)(task_thread_info(p) + 1);
2106 static inline int object_is_on_stack(void *obj)
2108 void *stack = task_stack_page(current);
2110 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2113 extern void thread_info_cache_init(void);
2115 /* set thread flags in other task's structures
2116 * - see asm/thread_info.h for TIF_xxxx flags available
2118 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2120 set_ti_thread_flag(task_thread_info(tsk), flag);
2123 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2125 clear_ti_thread_flag(task_thread_info(tsk), flag);
2128 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2130 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2133 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2135 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2138 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2140 return test_ti_thread_flag(task_thread_info(tsk), flag);
2143 static inline void set_tsk_need_resched(struct task_struct *tsk)
2145 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2148 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2150 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2153 static inline int test_tsk_need_resched(struct task_struct *tsk)
2155 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2158 static inline int signal_pending(struct task_struct *p)
2160 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2163 extern int __fatal_signal_pending(struct task_struct *p);
2165 static inline int fatal_signal_pending(struct task_struct *p)
2167 return signal_pending(p) && __fatal_signal_pending(p);
2170 static inline int signal_pending_state(long state, struct task_struct *p)
2172 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2174 if (!signal_pending(p))
2177 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2180 static inline int need_resched(void)
2182 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2186 * cond_resched() and cond_resched_lock(): latency reduction via
2187 * explicit rescheduling in places that are safe. The return
2188 * value indicates whether a reschedule was done in fact.
2189 * cond_resched_lock() will drop the spinlock before scheduling,
2190 * cond_resched_softirq() will enable bhs before scheduling.
2192 extern int _cond_resched(void);
2193 #ifdef CONFIG_PREEMPT_BKL
2194 static inline int cond_resched(void)
2199 static inline int cond_resched(void)
2201 return _cond_resched();
2204 extern int cond_resched_lock(spinlock_t * lock);
2205 extern int cond_resched_softirq(void);
2206 static inline int cond_resched_bkl(void)
2208 return _cond_resched();
2212 * Does a critical section need to be broken due to another
2213 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2214 * but a general need for low latency)
2216 static inline int spin_needbreak(spinlock_t *lock)
2218 #ifdef CONFIG_PREEMPT
2219 return spin_is_contended(lock);
2226 * Thread group CPU time accounting.
2229 extern int thread_group_cputime_alloc(struct task_struct *);
2230 extern void thread_group_cputime(struct task_struct *, struct task_cputime *);
2232 static inline void thread_group_cputime_init(struct signal_struct *sig)
2234 sig->cputime.totals = NULL;
2237 static inline int thread_group_cputime_clone_thread(struct task_struct *curr)
2239 if (curr->signal->cputime.totals)
2241 return thread_group_cputime_alloc(curr);
2244 static inline void thread_group_cputime_free(struct signal_struct *sig)
2246 free_percpu(sig->cputime.totals);
2250 * Reevaluate whether the task has signals pending delivery.
2251 * Wake the task if so.
2252 * This is required every time the blocked sigset_t changes.
2253 * callers must hold sighand->siglock.
2255 extern void recalc_sigpending_and_wake(struct task_struct *t);
2256 extern void recalc_sigpending(void);
2258 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2261 * Wrappers for p->thread_info->cpu access. No-op on UP.
2265 static inline unsigned int task_cpu(const struct task_struct *p)
2267 return task_thread_info(p)->cpu;
2270 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2274 static inline unsigned int task_cpu(const struct task_struct *p)
2279 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2283 #endif /* CONFIG_SMP */
2285 extern void arch_pick_mmap_layout(struct mm_struct *mm);
2287 #ifdef CONFIG_TRACING
2289 __trace_special(void *__tr, void *__data,
2290 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2293 __trace_special(void *__tr, void *__data,
2294 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2299 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2300 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2302 extern void normalize_rt_tasks(void);
2304 #ifdef CONFIG_GROUP_SCHED
2306 extern struct task_group init_task_group;
2307 #ifdef CONFIG_USER_SCHED
2308 extern struct task_group root_task_group;
2309 extern void set_tg_uid(struct user_struct *user);
2312 extern struct task_group *sched_create_group(struct task_group *parent);
2313 extern void sched_destroy_group(struct task_group *tg);
2314 extern void sched_move_task(struct task_struct *tsk);
2315 #ifdef CONFIG_FAIR_GROUP_SCHED
2316 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2317 extern unsigned long sched_group_shares(struct task_group *tg);
2319 #ifdef CONFIG_RT_GROUP_SCHED
2320 extern int sched_group_set_rt_runtime(struct task_group *tg,
2321 long rt_runtime_us);
2322 extern long sched_group_rt_runtime(struct task_group *tg);
2323 extern int sched_group_set_rt_period(struct task_group *tg,
2325 extern long sched_group_rt_period(struct task_group *tg);
2329 #ifdef CONFIG_TASK_XACCT
2330 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2332 tsk->ioac.rchar += amt;
2335 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2337 tsk->ioac.wchar += amt;
2340 static inline void inc_syscr(struct task_struct *tsk)
2345 static inline void inc_syscw(struct task_struct *tsk)
2350 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2354 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2358 static inline void inc_syscr(struct task_struct *tsk)
2362 static inline void inc_syscw(struct task_struct *tsk)
2367 #ifndef TASK_SIZE_OF
2368 #define TASK_SIZE_OF(tsk) TASK_SIZE
2371 #ifdef CONFIG_MM_OWNER
2372 extern void mm_update_next_owner(struct mm_struct *mm);
2373 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2375 static inline void mm_update_next_owner(struct mm_struct *mm)
2379 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2382 #endif /* CONFIG_MM_OWNER */
2384 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2386 #endif /* __KERNEL__ */