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_NEWNET 0x40000000 /* New network namespace */
33 #define SCHED_NORMAL 0
37 /* SCHED_ISO: reserved but not implemented yet */
46 #include <asm/param.h> /* for HZ */
48 #include <linux/capability.h>
49 #include <linux/threads.h>
50 #include <linux/kernel.h>
51 #include <linux/types.h>
52 #include <linux/timex.h>
53 #include <linux/jiffies.h>
54 #include <linux/rbtree.h>
55 #include <linux/thread_info.h>
56 #include <linux/cpumask.h>
57 #include <linux/errno.h>
58 #include <linux/nodemask.h>
59 #include <linux/mm_types.h>
61 #include <asm/system.h>
62 #include <asm/semaphore.h>
64 #include <asm/ptrace.h>
65 #include <asm/cputime.h>
67 #include <linux/smp.h>
68 #include <linux/sem.h>
69 #include <linux/signal.h>
70 #include <linux/securebits.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/seccomp.h>
78 #include <linux/rcupdate.h>
79 #include <linux/futex.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>
90 #include <asm/processor.h>
93 struct futex_pi_state;
97 * List of flags we want to share for kernel threads,
98 * if only because they are not used by them anyway.
100 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
103 * These are the constant used to fake the fixed-point load-average
104 * counting. Some notes:
105 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
106 * a load-average precision of 10 bits integer + 11 bits fractional
107 * - if you want to count load-averages more often, you need more
108 * precision, or rounding will get you. With 2-second counting freq,
109 * the EXP_n values would be 1981, 2034 and 2043 if still using only
112 extern unsigned long avenrun[]; /* Load averages */
114 #define FSHIFT 11 /* nr of bits of precision */
115 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
116 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
117 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
118 #define EXP_5 2014 /* 1/exp(5sec/5min) */
119 #define EXP_15 2037 /* 1/exp(5sec/15min) */
121 #define CALC_LOAD(load,exp,n) \
123 load += n*(FIXED_1-exp); \
126 extern unsigned long total_forks;
127 extern int nr_threads;
128 DECLARE_PER_CPU(unsigned long, process_counts);
129 extern int nr_processes(void);
130 extern unsigned long nr_running(void);
131 extern unsigned long nr_uninterruptible(void);
132 extern unsigned long nr_active(void);
133 extern unsigned long nr_iowait(void);
134 extern unsigned long weighted_cpuload(const int cpu);
139 #ifdef CONFIG_SCHED_DEBUG
140 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
141 extern void proc_sched_set_task(struct task_struct *p);
143 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
146 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
149 static inline void proc_sched_set_task(struct task_struct *p)
153 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
159 * Task state bitmask. NOTE! These bits are also
160 * encoded in fs/proc/array.c: get_task_state().
162 * We have two separate sets of flags: task->state
163 * is about runnability, while task->exit_state are
164 * about the task exiting. Confusing, but this way
165 * modifying one set can't modify the other one by
168 #define TASK_RUNNING 0
169 #define TASK_INTERRUPTIBLE 1
170 #define TASK_UNINTERRUPTIBLE 2
171 #define TASK_STOPPED 4
172 #define TASK_TRACED 8
173 /* in tsk->exit_state */
174 #define EXIT_ZOMBIE 16
176 /* in tsk->state again */
179 #define __set_task_state(tsk, state_value) \
180 do { (tsk)->state = (state_value); } while (0)
181 #define set_task_state(tsk, state_value) \
182 set_mb((tsk)->state, (state_value))
185 * set_current_state() includes a barrier so that the write of current->state
186 * is correctly serialised wrt the caller's subsequent test of whether to
189 * set_current_state(TASK_UNINTERRUPTIBLE);
190 * if (do_i_need_to_sleep())
193 * If the caller does not need such serialisation then use __set_current_state()
195 #define __set_current_state(state_value) \
196 do { current->state = (state_value); } while (0)
197 #define set_current_state(state_value) \
198 set_mb(current->state, (state_value))
200 /* Task command name length */
201 #define TASK_COMM_LEN 16
203 #include <linux/spinlock.h>
206 * This serializes "schedule()" and also protects
207 * the run-queue from deletions/modifications (but
208 * _adding_ to the beginning of the run-queue has
211 extern rwlock_t tasklist_lock;
212 extern spinlock_t mmlist_lock;
216 extern void sched_init(void);
217 extern void sched_init_smp(void);
218 extern void init_idle(struct task_struct *idle, int cpu);
219 extern void init_idle_bootup_task(struct task_struct *idle);
221 extern cpumask_t nohz_cpu_mask;
222 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
223 extern int select_nohz_load_balancer(int cpu);
225 static inline int select_nohz_load_balancer(int cpu)
232 * Only dump TASK_* tasks. (0 for all tasks)
234 extern void show_state_filter(unsigned long state_filter);
236 static inline void show_state(void)
238 show_state_filter(0);
241 extern void show_regs(struct pt_regs *);
244 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
245 * task), SP is the stack pointer of the first frame that should be shown in the back
246 * trace (or NULL if the entire call-chain of the task should be shown).
248 extern void show_stack(struct task_struct *task, unsigned long *sp);
250 void io_schedule(void);
251 long io_schedule_timeout(long timeout);
253 extern void cpu_init (void);
254 extern void trap_init(void);
255 extern void update_process_times(int user);
256 extern void scheduler_tick(void);
258 #ifdef CONFIG_DETECT_SOFTLOCKUP
259 extern void softlockup_tick(void);
260 extern void spawn_softlockup_task(void);
261 extern void touch_softlockup_watchdog(void);
262 extern void touch_all_softlockup_watchdogs(void);
264 static inline void softlockup_tick(void)
267 static inline void spawn_softlockup_task(void)
270 static inline void touch_softlockup_watchdog(void)
273 static inline void touch_all_softlockup_watchdogs(void)
279 /* Attach to any functions which should be ignored in wchan output. */
280 #define __sched __attribute__((__section__(".sched.text")))
281 /* Is this address in the __sched functions? */
282 extern int in_sched_functions(unsigned long addr);
284 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
285 extern signed long FASTCALL(schedule_timeout(signed long timeout));
286 extern signed long schedule_timeout_interruptible(signed long timeout);
287 extern signed long schedule_timeout_uninterruptible(signed long timeout);
288 asmlinkage void schedule(void);
291 struct user_namespace;
293 /* Maximum number of active map areas.. This is a random (large) number */
294 #define DEFAULT_MAX_MAP_COUNT 65536
296 extern int sysctl_max_map_count;
298 #include <linux/aio.h>
301 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
302 unsigned long, unsigned long);
304 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
305 unsigned long len, unsigned long pgoff,
306 unsigned long flags);
307 extern void arch_unmap_area(struct mm_struct *, unsigned long);
308 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
310 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
312 * The mm counters are not protected by its page_table_lock,
313 * so must be incremented atomically.
315 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
316 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
317 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
318 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
319 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
321 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
323 * The mm counters are protected by its page_table_lock,
324 * so can be incremented directly.
326 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
327 #define get_mm_counter(mm, member) ((mm)->_##member)
328 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
329 #define inc_mm_counter(mm, member) (mm)->_##member++
330 #define dec_mm_counter(mm, member) (mm)->_##member--
332 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
334 #define get_mm_rss(mm) \
335 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
336 #define update_hiwater_rss(mm) do { \
337 unsigned long _rss = get_mm_rss(mm); \
338 if ((mm)->hiwater_rss < _rss) \
339 (mm)->hiwater_rss = _rss; \
341 #define update_hiwater_vm(mm) do { \
342 if ((mm)->hiwater_vm < (mm)->total_vm) \
343 (mm)->hiwater_vm = (mm)->total_vm; \
346 extern void set_dumpable(struct mm_struct *mm, int value);
347 extern int get_dumpable(struct mm_struct *mm);
351 #define MMF_DUMPABLE 0 /* core dump is permitted */
352 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
353 #define MMF_DUMPABLE_BITS 2
355 /* coredump filter bits */
356 #define MMF_DUMP_ANON_PRIVATE 2
357 #define MMF_DUMP_ANON_SHARED 3
358 #define MMF_DUMP_MAPPED_PRIVATE 4
359 #define MMF_DUMP_MAPPED_SHARED 5
360 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
361 #define MMF_DUMP_FILTER_BITS 4
362 #define MMF_DUMP_FILTER_MASK \
363 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
364 #define MMF_DUMP_FILTER_DEFAULT \
365 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
367 struct sighand_struct {
369 struct k_sigaction action[_NSIG];
371 wait_queue_head_t signalfd_wqh;
374 struct pacct_struct {
377 unsigned long ac_mem;
378 cputime_t ac_utime, ac_stime;
379 unsigned long ac_minflt, ac_majflt;
383 * NOTE! "signal_struct" does not have it's own
384 * locking, because a shared signal_struct always
385 * implies a shared sighand_struct, so locking
386 * sighand_struct is always a proper superset of
387 * the locking of signal_struct.
389 struct signal_struct {
393 wait_queue_head_t wait_chldexit; /* for wait4() */
395 /* current thread group signal load-balancing target: */
396 struct task_struct *curr_target;
398 /* shared signal handling: */
399 struct sigpending shared_pending;
401 /* thread group exit support */
404 * - notify group_exit_task when ->count is equal to notify_count
405 * - everyone except group_exit_task is stopped during signal delivery
406 * of fatal signals, group_exit_task processes the signal.
408 struct task_struct *group_exit_task;
411 /* thread group stop support, overloads group_exit_code too */
412 int group_stop_count;
413 unsigned int flags; /* see SIGNAL_* flags below */
415 /* POSIX.1b Interval Timers */
416 struct list_head posix_timers;
418 /* ITIMER_REAL timer for the process */
419 struct hrtimer real_timer;
420 struct task_struct *tsk;
421 ktime_t it_real_incr;
423 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
424 cputime_t it_prof_expires, it_virt_expires;
425 cputime_t it_prof_incr, it_virt_incr;
427 /* job control IDs */
429 struct pid *tty_old_pgrp;
432 pid_t session __deprecated;
436 /* boolean value for session group leader */
439 struct tty_struct *tty; /* NULL if no tty */
442 * Cumulative resource counters for dead threads in the group,
443 * and for reaped dead child processes forked by this group.
444 * Live threads maintain their own counters and add to these
445 * in __exit_signal, except for the group leader.
447 cputime_t utime, stime, cutime, cstime;
450 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
451 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
452 unsigned long inblock, oublock, cinblock, coublock;
455 * Cumulative ns of scheduled CPU time for dead threads in the
456 * group, not including a zombie group leader. (This only differs
457 * from jiffies_to_ns(utime + stime) if sched_clock uses something
458 * other than jiffies.)
460 unsigned long long sum_sched_runtime;
463 * We don't bother to synchronize most readers of this at all,
464 * because there is no reader checking a limit that actually needs
465 * to get both rlim_cur and rlim_max atomically, and either one
466 * alone is a single word that can safely be read normally.
467 * getrlimit/setrlimit use task_lock(current->group_leader) to
468 * protect this instead of the siglock, because they really
469 * have no need to disable irqs.
471 struct rlimit rlim[RLIM_NLIMITS];
473 struct list_head cpu_timers[3];
475 /* keep the process-shared keyrings here so that they do the right
476 * thing in threads created with CLONE_THREAD */
478 struct key *session_keyring; /* keyring inherited over fork */
479 struct key *process_keyring; /* keyring private to this process */
481 #ifdef CONFIG_BSD_PROCESS_ACCT
482 struct pacct_struct pacct; /* per-process accounting information */
484 #ifdef CONFIG_TASKSTATS
485 struct taskstats *stats;
489 struct tty_audit_buf *tty_audit_buf;
493 /* Context switch must be unlocked if interrupts are to be enabled */
494 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
495 # define __ARCH_WANT_UNLOCKED_CTXSW
499 * Bits in flags field of signal_struct.
501 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
502 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
503 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
504 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
507 * Some day this will be a full-fledged user tracking system..
510 atomic_t __count; /* reference count */
511 atomic_t processes; /* How many processes does this user have? */
512 atomic_t files; /* How many open files does this user have? */
513 atomic_t sigpending; /* How many pending signals does this user have? */
514 #ifdef CONFIG_INOTIFY_USER
515 atomic_t inotify_watches; /* How many inotify watches does this user have? */
516 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
518 /* protected by mq_lock */
519 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
520 unsigned long locked_shm; /* How many pages of mlocked shm ? */
523 struct key *uid_keyring; /* UID specific keyring */
524 struct key *session_keyring; /* UID's default session keyring */
527 /* Hash table maintenance information */
528 struct hlist_node uidhash_node;
531 #ifdef CONFIG_FAIR_USER_SCHED
532 struct task_group *tg;
534 struct subsys_attribute user_attr;
535 struct work_struct work;
539 #ifdef CONFIG_FAIR_USER_SCHED
540 extern int uids_kobject_init(void);
542 static inline int uids_kobject_init(void) { return 0; }
545 extern struct user_struct *find_user(uid_t);
547 extern struct user_struct root_user;
548 #define INIT_USER (&root_user)
550 struct backing_dev_info;
551 struct reclaim_state;
553 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
555 /* cumulative counters */
556 unsigned long pcount; /* # of times run on this cpu */
557 unsigned long long cpu_time, /* time spent on the cpu */
558 run_delay; /* time spent waiting on a runqueue */
561 unsigned long long last_arrival,/* when we last ran on a cpu */
562 last_queued; /* when we were last queued to run */
563 #ifdef CONFIG_SCHEDSTATS
565 unsigned long bkl_count;
568 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
570 #ifdef CONFIG_SCHEDSTATS
571 extern const struct file_operations proc_schedstat_operations;
572 #endif /* CONFIG_SCHEDSTATS */
574 #ifdef CONFIG_TASK_DELAY_ACCT
575 struct task_delay_info {
577 unsigned int flags; /* Private per-task flags */
579 /* For each stat XXX, add following, aligned appropriately
581 * struct timespec XXX_start, XXX_end;
585 * Atomicity of updates to XXX_delay, XXX_count protected by
586 * single lock above (split into XXX_lock if contention is an issue).
590 * XXX_count is incremented on every XXX operation, the delay
591 * associated with the operation is added to XXX_delay.
592 * XXX_delay contains the accumulated delay time in nanoseconds.
594 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
595 u64 blkio_delay; /* wait for sync block io completion */
596 u64 swapin_delay; /* wait for swapin block io completion */
597 u32 blkio_count; /* total count of the number of sync block */
598 /* io operations performed */
599 u32 swapin_count; /* total count of the number of swapin block */
600 /* io operations performed */
602 #endif /* CONFIG_TASK_DELAY_ACCT */
604 static inline int sched_info_on(void)
606 #ifdef CONFIG_SCHEDSTATS
608 #elif defined(CONFIG_TASK_DELAY_ACCT)
609 extern int delayacct_on;
624 * sched-domains (multiprocessor balancing) declarations:
628 * Increase resolution of nice-level calculations:
630 #define SCHED_LOAD_SHIFT 10
631 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
633 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
636 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
637 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
638 #define SD_BALANCE_EXEC 4 /* Balance on exec */
639 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
640 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
641 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
642 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
643 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
644 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
645 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
646 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
648 #define BALANCE_FOR_MC_POWER \
649 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
651 #define BALANCE_FOR_PKG_POWER \
652 ((sched_mc_power_savings || sched_smt_power_savings) ? \
653 SD_POWERSAVINGS_BALANCE : 0)
655 #define test_sd_parent(sd, flag) ((sd->parent && \
656 (sd->parent->flags & flag)) ? 1 : 0)
660 struct sched_group *next; /* Must be a circular list */
664 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
665 * single CPU. This is read only (except for setup, hotplug CPU).
666 * Note : Never change cpu_power without recompute its reciprocal
668 unsigned int __cpu_power;
670 * reciprocal value of cpu_power to avoid expensive divides
671 * (see include/linux/reciprocal_div.h)
673 u32 reciprocal_cpu_power;
676 struct sched_domain {
677 /* These fields must be setup */
678 struct sched_domain *parent; /* top domain must be null terminated */
679 struct sched_domain *child; /* bottom domain must be null terminated */
680 struct sched_group *groups; /* the balancing groups of the domain */
681 cpumask_t span; /* span of all CPUs in this domain */
682 unsigned long min_interval; /* Minimum balance interval ms */
683 unsigned long max_interval; /* Maximum balance interval ms */
684 unsigned int busy_factor; /* less balancing by factor if busy */
685 unsigned int imbalance_pct; /* No balance until over watermark */
686 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
687 unsigned int busy_idx;
688 unsigned int idle_idx;
689 unsigned int newidle_idx;
690 unsigned int wake_idx;
691 unsigned int forkexec_idx;
692 int flags; /* See SD_* */
694 /* Runtime fields. */
695 unsigned long last_balance; /* init to jiffies. units in jiffies */
696 unsigned int balance_interval; /* initialise to 1. units in ms. */
697 unsigned int nr_balance_failed; /* initialise to 0 */
699 #ifdef CONFIG_SCHEDSTATS
700 /* load_balance() stats */
701 unsigned long lb_count[CPU_MAX_IDLE_TYPES];
702 unsigned long lb_failed[CPU_MAX_IDLE_TYPES];
703 unsigned long lb_balanced[CPU_MAX_IDLE_TYPES];
704 unsigned long lb_imbalance[CPU_MAX_IDLE_TYPES];
705 unsigned long lb_gained[CPU_MAX_IDLE_TYPES];
706 unsigned long lb_hot_gained[CPU_MAX_IDLE_TYPES];
707 unsigned long lb_nobusyg[CPU_MAX_IDLE_TYPES];
708 unsigned long lb_nobusyq[CPU_MAX_IDLE_TYPES];
710 /* Active load balancing */
711 unsigned long alb_count;
712 unsigned long alb_failed;
713 unsigned long alb_pushed;
715 /* SD_BALANCE_EXEC stats */
716 unsigned long sbe_count;
717 unsigned long sbe_balanced;
718 unsigned long sbe_pushed;
720 /* SD_BALANCE_FORK stats */
721 unsigned long sbf_count;
722 unsigned long sbf_balanced;
723 unsigned long sbf_pushed;
725 /* try_to_wake_up() stats */
726 unsigned long ttwu_wake_remote;
727 unsigned long ttwu_move_affine;
728 unsigned long ttwu_move_balance;
732 #endif /* CONFIG_SMP */
735 * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
736 * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
737 * task of nice 0 or enough lower priority tasks to bring up the
740 static inline int above_background_load(void)
744 for_each_online_cpu(cpu) {
745 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
751 struct io_context; /* See blkdev.h */
754 #define NGROUPS_SMALL 32
755 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
759 gid_t small_block[NGROUPS_SMALL];
765 * get_group_info() must be called with the owning task locked (via task_lock())
766 * when task != current. The reason being that the vast majority of callers are
767 * looking at current->group_info, which can not be changed except by the
768 * current task. Changing current->group_info requires the task lock, too.
770 #define get_group_info(group_info) do { \
771 atomic_inc(&(group_info)->usage); \
774 #define put_group_info(group_info) do { \
775 if (atomic_dec_and_test(&(group_info)->usage)) \
776 groups_free(group_info); \
779 extern struct group_info *groups_alloc(int gidsetsize);
780 extern void groups_free(struct group_info *group_info);
781 extern int set_current_groups(struct group_info *group_info);
782 extern int groups_search(struct group_info *group_info, gid_t grp);
783 /* access the groups "array" with this macro */
784 #define GROUP_AT(gi, i) \
785 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
787 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
788 extern void prefetch_stack(struct task_struct *t);
790 static inline void prefetch_stack(struct task_struct *t) { }
793 struct audit_context; /* See audit.c */
795 struct pipe_inode_info;
796 struct uts_namespace;
802 const struct sched_class *next;
804 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
805 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
806 void (*yield_task) (struct rq *rq);
808 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
810 struct task_struct * (*pick_next_task) (struct rq *rq);
811 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
813 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
815 unsigned long max_nr_move, unsigned long max_load_move,
816 struct sched_domain *sd, enum cpu_idle_type idle,
817 int *all_pinned, int *this_best_prio);
819 void (*set_curr_task) (struct rq *rq);
820 void (*task_tick) (struct rq *rq, struct task_struct *p);
821 void (*task_new) (struct rq *rq, struct task_struct *p);
825 unsigned long weight, inv_weight;
829 * CFS stats for a schedulable entity (task, task-group etc)
831 * Current field usage histogram:
838 struct sched_entity {
839 struct load_weight load; /* for load-balancing */
840 struct rb_node run_node;
845 u64 sum_exec_runtime;
847 u64 prev_sum_exec_runtime;
849 #ifdef CONFIG_SCHEDSTATS
855 s64 sum_sleep_runtime;
863 u64 nr_migrations_cold;
864 u64 nr_failed_migrations_affine;
865 u64 nr_failed_migrations_running;
866 u64 nr_failed_migrations_hot;
867 u64 nr_forced_migrations;
868 u64 nr_forced2_migrations;
872 u64 nr_wakeups_migrate;
873 u64 nr_wakeups_local;
874 u64 nr_wakeups_remote;
875 u64 nr_wakeups_affine;
876 u64 nr_wakeups_affine_attempts;
877 u64 nr_wakeups_passive;
881 #ifdef CONFIG_FAIR_GROUP_SCHED
882 struct sched_entity *parent;
883 /* rq on which this entity is (to be) queued: */
884 struct cfs_rq *cfs_rq;
885 /* rq "owned" by this entity/group: */
891 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
894 unsigned int flags; /* per process flags, defined below */
897 int lock_depth; /* BKL lock depth */
900 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
905 int prio, static_prio, normal_prio;
906 struct list_head run_list;
907 const struct sched_class *sched_class;
908 struct sched_entity se;
910 #ifdef CONFIG_PREEMPT_NOTIFIERS
911 /* list of struct preempt_notifier: */
912 struct hlist_head preempt_notifiers;
915 unsigned short ioprio;
916 #ifdef CONFIG_BLK_DEV_IO_TRACE
917 unsigned int btrace_seq;
921 cpumask_t cpus_allowed;
922 unsigned int time_slice;
924 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
925 struct sched_info sched_info;
928 struct list_head tasks;
930 * ptrace_list/ptrace_children forms the list of my children
931 * that were stolen by a ptracer.
933 struct list_head ptrace_children;
934 struct list_head ptrace_list;
936 struct mm_struct *mm, *active_mm;
939 struct linux_binfmt *binfmt;
941 int exit_code, exit_signal;
942 int pdeath_signal; /* The signal sent when the parent dies */
944 unsigned int personality;
949 #ifdef CONFIG_CC_STACKPROTECTOR
950 /* Canary value for the -fstack-protector gcc feature */
951 unsigned long stack_canary;
954 * pointers to (original) parent process, youngest child, younger sibling,
955 * older sibling, respectively. (p->father can be replaced with
958 struct task_struct *real_parent; /* real parent process (when being debugged) */
959 struct task_struct *parent; /* parent process */
961 * children/sibling forms the list of my children plus the
962 * tasks I'm ptracing.
964 struct list_head children; /* list of my children */
965 struct list_head sibling; /* linkage in my parent's children list */
966 struct task_struct *group_leader; /* threadgroup leader */
968 /* PID/PID hash table linkage. */
969 struct pid_link pids[PIDTYPE_MAX];
970 struct list_head thread_group;
972 struct completion *vfork_done; /* for vfork() */
973 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
974 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
976 unsigned int rt_priority;
977 cputime_t utime, stime;
979 unsigned long nvcsw, nivcsw; /* context switch counts */
980 struct timespec start_time; /* monotonic time */
981 struct timespec real_start_time; /* boot based time */
982 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
983 unsigned long min_flt, maj_flt;
985 cputime_t it_prof_expires, it_virt_expires;
986 unsigned long long it_sched_expires;
987 struct list_head cpu_timers[3];
989 /* process credentials */
990 uid_t uid,euid,suid,fsuid;
991 gid_t gid,egid,sgid,fsgid;
992 struct group_info *group_info;
993 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
994 unsigned keep_capabilities:1;
995 struct user_struct *user;
997 struct key *request_key_auth; /* assumed request_key authority */
998 struct key *thread_keyring; /* keyring private to this thread */
999 unsigned char jit_keyring; /* default keyring to attach requested keys to */
1002 * fpu_counter contains the number of consecutive context switches
1003 * that the FPU is used. If this is over a threshold, the lazy fpu
1004 * saving becomes unlazy to save the trap. This is an unsigned char
1005 * so that after 256 times the counter wraps and the behavior turns
1006 * lazy again; this to deal with bursty apps that only use FPU for
1009 unsigned char fpu_counter;
1010 int oomkilladj; /* OOM kill score adjustment (bit shift). */
1011 char comm[TASK_COMM_LEN]; /* executable name excluding path
1012 - access with [gs]et_task_comm (which lock
1013 it with task_lock())
1014 - initialized normally by flush_old_exec */
1015 /* file system info */
1016 int link_count, total_link_count;
1017 #ifdef CONFIG_SYSVIPC
1019 struct sysv_sem sysvsem;
1021 /* CPU-specific state of this task */
1022 struct thread_struct thread;
1023 /* filesystem information */
1024 struct fs_struct *fs;
1025 /* open file information */
1026 struct files_struct *files;
1028 struct nsproxy *nsproxy;
1029 /* signal handlers */
1030 struct signal_struct *signal;
1031 struct sighand_struct *sighand;
1033 sigset_t blocked, real_blocked;
1034 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */
1035 struct sigpending pending;
1037 unsigned long sas_ss_sp;
1039 int (*notifier)(void *priv);
1040 void *notifier_data;
1041 sigset_t *notifier_mask;
1044 struct audit_context *audit_context;
1047 /* Thread group tracking */
1050 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1051 spinlock_t alloc_lock;
1053 /* Protection of the PI data structures: */
1056 #ifdef CONFIG_RT_MUTEXES
1057 /* PI waiters blocked on a rt_mutex held by this task */
1058 struct plist_head pi_waiters;
1059 /* Deadlock detection and priority inheritance handling */
1060 struct rt_mutex_waiter *pi_blocked_on;
1063 #ifdef CONFIG_DEBUG_MUTEXES
1064 /* mutex deadlock detection */
1065 struct mutex_waiter *blocked_on;
1067 #ifdef CONFIG_TRACE_IRQFLAGS
1068 unsigned int irq_events;
1069 int hardirqs_enabled;
1070 unsigned long hardirq_enable_ip;
1071 unsigned int hardirq_enable_event;
1072 unsigned long hardirq_disable_ip;
1073 unsigned int hardirq_disable_event;
1074 int softirqs_enabled;
1075 unsigned long softirq_disable_ip;
1076 unsigned int softirq_disable_event;
1077 unsigned long softirq_enable_ip;
1078 unsigned int softirq_enable_event;
1079 int hardirq_context;
1080 int softirq_context;
1082 #ifdef CONFIG_LOCKDEP
1083 # define MAX_LOCK_DEPTH 30UL
1086 struct held_lock held_locks[MAX_LOCK_DEPTH];
1087 unsigned int lockdep_recursion;
1090 /* journalling filesystem info */
1093 /* stacked block device info */
1094 struct bio *bio_list, **bio_tail;
1097 struct reclaim_state *reclaim_state;
1099 struct backing_dev_info *backing_dev_info;
1101 struct io_context *io_context;
1103 unsigned long ptrace_message;
1104 siginfo_t *last_siginfo; /* For ptrace use. */
1106 * current io wait handle: wait queue entry to use for io waits
1107 * If this thread is processing aio, this points at the waitqueue
1108 * inside the currently handled kiocb. It may be NULL (i.e. default
1109 * to a stack based synchronous wait) if its doing sync IO.
1111 wait_queue_t *io_wait;
1112 #ifdef CONFIG_TASK_XACCT
1113 /* i/o counters(bytes read/written, #syscalls */
1114 u64 rchar, wchar, syscr, syscw;
1116 struct task_io_accounting ioac;
1117 #if defined(CONFIG_TASK_XACCT)
1118 u64 acct_rss_mem1; /* accumulated rss usage */
1119 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1120 cputime_t acct_stimexpd;/* stime since last update */
1123 struct mempolicy *mempolicy;
1126 #ifdef CONFIG_CPUSETS
1127 struct cpuset *cpuset;
1128 nodemask_t mems_allowed;
1129 int cpuset_mems_generation;
1130 int cpuset_mem_spread_rotor;
1132 struct robust_list_head __user *robust_list;
1133 #ifdef CONFIG_COMPAT
1134 struct compat_robust_list_head __user *compat_robust_list;
1136 struct list_head pi_state_list;
1137 struct futex_pi_state *pi_state_cache;
1139 atomic_t fs_excl; /* holding fs exclusive resources */
1140 struct rcu_head rcu;
1143 * cache last used pipe for splice
1145 struct pipe_inode_info *splice_pipe;
1146 #ifdef CONFIG_TASK_DELAY_ACCT
1147 struct task_delay_info *delays;
1149 #ifdef CONFIG_FAULT_INJECTION
1155 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1156 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1157 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1158 * values are inverted: lower p->prio value means higher priority.
1160 * The MAX_USER_RT_PRIO value allows the actual maximum
1161 * RT priority to be separate from the value exported to
1162 * user-space. This allows kernel threads to set their
1163 * priority to a value higher than any user task. Note:
1164 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1167 #define MAX_USER_RT_PRIO 100
1168 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1170 #define MAX_PRIO (MAX_RT_PRIO + 40)
1171 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1173 static inline int rt_prio(int prio)
1175 if (unlikely(prio < MAX_RT_PRIO))
1180 static inline int rt_task(struct task_struct *p)
1182 return rt_prio(p->prio);
1185 static inline pid_t process_group(struct task_struct *tsk)
1187 return tsk->signal->pgrp;
1190 static inline pid_t signal_session(struct signal_struct *sig)
1192 return sig->__session;
1195 static inline pid_t process_session(struct task_struct *tsk)
1197 return signal_session(tsk->signal);
1200 static inline void set_signal_session(struct signal_struct *sig, pid_t session)
1202 sig->__session = session;
1205 static inline struct pid *task_pid(struct task_struct *task)
1207 return task->pids[PIDTYPE_PID].pid;
1210 static inline struct pid *task_tgid(struct task_struct *task)
1212 return task->group_leader->pids[PIDTYPE_PID].pid;
1215 static inline struct pid *task_pgrp(struct task_struct *task)
1217 return task->group_leader->pids[PIDTYPE_PGID].pid;
1220 static inline struct pid *task_session(struct task_struct *task)
1222 return task->group_leader->pids[PIDTYPE_SID].pid;
1226 * pid_alive - check that a task structure is not stale
1227 * @p: Task structure to be checked.
1229 * Test if a process is not yet dead (at most zombie state)
1230 * If pid_alive fails, then pointers within the task structure
1231 * can be stale and must not be dereferenced.
1233 static inline int pid_alive(struct task_struct *p)
1235 return p->pids[PIDTYPE_PID].pid != NULL;
1239 * is_init - check if a task structure is init
1240 * @tsk: Task structure to be checked.
1242 * Check if a task structure is the first user space task the kernel created.
1244 static inline int is_init(struct task_struct *tsk)
1246 return tsk->pid == 1;
1249 extern struct pid *cad_pid;
1251 extern void free_task(struct task_struct *tsk);
1252 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1254 extern void __put_task_struct(struct task_struct *t);
1256 static inline void put_task_struct(struct task_struct *t)
1258 if (atomic_dec_and_test(&t->usage))
1259 __put_task_struct(t);
1265 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1266 /* Not implemented yet, only for 486*/
1267 #define PF_STARTING 0x00000002 /* being created */
1268 #define PF_EXITING 0x00000004 /* getting shut down */
1269 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1270 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1271 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1272 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1273 #define PF_DUMPCORE 0x00000200 /* dumped core */
1274 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1275 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1276 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1277 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1278 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1279 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1280 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1281 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1282 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1283 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1284 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1285 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1286 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1287 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1288 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1289 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1290 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1291 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1294 * Only the _current_ task can read/write to tsk->flags, but other
1295 * tasks can access tsk->flags in readonly mode for example
1296 * with tsk_used_math (like during threaded core dumping).
1297 * There is however an exception to this rule during ptrace
1298 * or during fork: the ptracer task is allowed to write to the
1299 * child->flags of its traced child (same goes for fork, the parent
1300 * can write to the child->flags), because we're guaranteed the
1301 * child is not running and in turn not changing child->flags
1302 * at the same time the parent does it.
1304 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1305 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1306 #define clear_used_math() clear_stopped_child_used_math(current)
1307 #define set_used_math() set_stopped_child_used_math(current)
1308 #define conditional_stopped_child_used_math(condition, child) \
1309 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1310 #define conditional_used_math(condition) \
1311 conditional_stopped_child_used_math(condition, current)
1312 #define copy_to_stopped_child_used_math(child) \
1313 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1314 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1315 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1316 #define used_math() tsk_used_math(current)
1319 extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask);
1321 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1323 if (!cpu_isset(0, new_mask))
1329 extern unsigned long long sched_clock(void);
1332 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1333 * clock constructed from sched_clock():
1335 extern unsigned long long cpu_clock(int cpu);
1337 extern unsigned long long
1338 task_sched_runtime(struct task_struct *task);
1340 /* sched_exec is called by processes performing an exec */
1342 extern void sched_exec(void);
1344 #define sched_exec() {}
1347 extern void sched_clock_idle_sleep_event(void);
1348 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1350 #ifdef CONFIG_HOTPLUG_CPU
1351 extern void idle_task_exit(void);
1353 static inline void idle_task_exit(void) {}
1356 extern void sched_idle_next(void);
1358 #ifdef CONFIG_SCHED_DEBUG
1359 extern unsigned int sysctl_sched_latency;
1360 extern unsigned int sysctl_sched_nr_latency;
1361 extern unsigned int sysctl_sched_wakeup_granularity;
1362 extern unsigned int sysctl_sched_batch_wakeup_granularity;
1363 extern unsigned int sysctl_sched_child_runs_first;
1364 extern unsigned int sysctl_sched_features;
1365 extern unsigned int sysctl_sched_migration_cost;
1368 extern unsigned int sysctl_sched_compat_yield;
1370 #ifdef CONFIG_RT_MUTEXES
1371 extern int rt_mutex_getprio(struct task_struct *p);
1372 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1373 extern void rt_mutex_adjust_pi(struct task_struct *p);
1375 static inline int rt_mutex_getprio(struct task_struct *p)
1377 return p->normal_prio;
1379 # define rt_mutex_adjust_pi(p) do { } while (0)
1382 extern void set_user_nice(struct task_struct *p, long nice);
1383 extern int task_prio(const struct task_struct *p);
1384 extern int task_nice(const struct task_struct *p);
1385 extern int can_nice(const struct task_struct *p, const int nice);
1386 extern int task_curr(const struct task_struct *p);
1387 extern int idle_cpu(int cpu);
1388 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1389 extern struct task_struct *idle_task(int cpu);
1390 extern struct task_struct *curr_task(int cpu);
1391 extern void set_curr_task(int cpu, struct task_struct *p);
1396 * The default (Linux) execution domain.
1398 extern struct exec_domain default_exec_domain;
1400 union thread_union {
1401 struct thread_info thread_info;
1402 unsigned long stack[THREAD_SIZE/sizeof(long)];
1405 #ifndef __HAVE_ARCH_KSTACK_END
1406 static inline int kstack_end(void *addr)
1408 /* Reliable end of stack detection:
1409 * Some APM bios versions misalign the stack
1411 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1415 extern union thread_union init_thread_union;
1416 extern struct task_struct init_task;
1418 extern struct mm_struct init_mm;
1420 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1421 extern struct task_struct *find_task_by_pid_type(int type, int pid);
1422 extern void __set_special_pids(pid_t session, pid_t pgrp);
1424 /* per-UID process charging. */
1425 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1426 static inline struct user_struct *get_uid(struct user_struct *u)
1428 atomic_inc(&u->__count);
1431 extern void free_uid(struct user_struct *);
1432 extern void switch_uid(struct user_struct *);
1433 extern void release_uids(struct user_namespace *ns);
1435 #include <asm/current.h>
1437 extern void do_timer(unsigned long ticks);
1439 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
1440 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
1441 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
1442 unsigned long clone_flags));
1444 extern void kick_process(struct task_struct *tsk);
1446 static inline void kick_process(struct task_struct *tsk) { }
1448 extern void sched_fork(struct task_struct *p, int clone_flags);
1449 extern void sched_dead(struct task_struct *p);
1451 extern int in_group_p(gid_t);
1452 extern int in_egroup_p(gid_t);
1454 extern void proc_caches_init(void);
1455 extern void flush_signals(struct task_struct *);
1456 extern void ignore_signals(struct task_struct *);
1457 extern void flush_signal_handlers(struct task_struct *, int force_default);
1458 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1460 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1462 unsigned long flags;
1465 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1466 ret = dequeue_signal(tsk, mask, info);
1467 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1472 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1474 extern void unblock_all_signals(void);
1475 extern void release_task(struct task_struct * p);
1476 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1477 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
1478 extern int force_sigsegv(int, struct task_struct *);
1479 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1480 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1481 extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1482 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1483 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1484 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1485 extern int kill_pid(struct pid *pid, int sig, int priv);
1486 extern int kill_proc_info(int, struct siginfo *, pid_t);
1487 extern void do_notify_parent(struct task_struct *, int);
1488 extern void force_sig(int, struct task_struct *);
1489 extern void force_sig_specific(int, struct task_struct *);
1490 extern int send_sig(int, struct task_struct *, int);
1491 extern void zap_other_threads(struct task_struct *p);
1492 extern int kill_proc(pid_t, int, int);
1493 extern struct sigqueue *sigqueue_alloc(void);
1494 extern void sigqueue_free(struct sigqueue *);
1495 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
1496 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
1497 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1498 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1500 static inline int kill_cad_pid(int sig, int priv)
1502 return kill_pid(cad_pid, sig, priv);
1505 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1506 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1507 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1508 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1510 static inline int is_si_special(const struct siginfo *info)
1512 return info <= SEND_SIG_FORCED;
1515 /* True if we are on the alternate signal stack. */
1517 static inline int on_sig_stack(unsigned long sp)
1519 return (sp - current->sas_ss_sp < current->sas_ss_size);
1522 static inline int sas_ss_flags(unsigned long sp)
1524 return (current->sas_ss_size == 0 ? SS_DISABLE
1525 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1529 * Routines for handling mm_structs
1531 extern struct mm_struct * mm_alloc(void);
1533 /* mmdrop drops the mm and the page tables */
1534 extern void FASTCALL(__mmdrop(struct mm_struct *));
1535 static inline void mmdrop(struct mm_struct * mm)
1537 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1541 /* mmput gets rid of the mappings and all user-space */
1542 extern void mmput(struct mm_struct *);
1543 /* Grab a reference to a task's mm, if it is not already going away */
1544 extern struct mm_struct *get_task_mm(struct task_struct *task);
1545 /* Remove the current tasks stale references to the old mm_struct */
1546 extern void mm_release(struct task_struct *, struct mm_struct *);
1548 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1549 extern void flush_thread(void);
1550 extern void exit_thread(void);
1552 extern void exit_files(struct task_struct *);
1553 extern void __cleanup_signal(struct signal_struct *);
1554 extern void __cleanup_sighand(struct sighand_struct *);
1555 extern void exit_itimers(struct signal_struct *);
1557 extern NORET_TYPE void do_group_exit(int);
1559 extern void daemonize(const char *, ...);
1560 extern int allow_signal(int);
1561 extern int disallow_signal(int);
1563 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1564 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1565 struct task_struct *fork_idle(int);
1567 extern void set_task_comm(struct task_struct *tsk, char *from);
1568 extern void get_task_comm(char *to, struct task_struct *tsk);
1571 extern void wait_task_inactive(struct task_struct * p);
1573 #define wait_task_inactive(p) do { } while (0)
1576 #define remove_parent(p) list_del_init(&(p)->sibling)
1577 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1579 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1581 #define for_each_process(p) \
1582 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1585 * Careful: do_each_thread/while_each_thread is a double loop so
1586 * 'break' will not work as expected - use goto instead.
1588 #define do_each_thread(g, t) \
1589 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1591 #define while_each_thread(g, t) \
1592 while ((t = next_thread(t)) != g)
1594 /* de_thread depends on thread_group_leader not being a pid based check */
1595 #define thread_group_leader(p) (p == p->group_leader)
1597 /* Do to the insanities of de_thread it is possible for a process
1598 * to have the pid of the thread group leader without actually being
1599 * the thread group leader. For iteration through the pids in proc
1600 * all we care about is that we have a task with the appropriate
1601 * pid, we don't actually care if we have the right task.
1603 static inline int has_group_leader_pid(struct task_struct *p)
1605 return p->pid == p->tgid;
1608 static inline struct task_struct *next_thread(const struct task_struct *p)
1610 return list_entry(rcu_dereference(p->thread_group.next),
1611 struct task_struct, thread_group);
1614 static inline int thread_group_empty(struct task_struct *p)
1616 return list_empty(&p->thread_group);
1619 #define delay_group_leader(p) \
1620 (thread_group_leader(p) && !thread_group_empty(p))
1623 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1624 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1625 * pins the final release of task.io_context. Also protects ->cpuset.
1627 * Nests both inside and outside of read_lock(&tasklist_lock).
1628 * It must not be nested with write_lock_irq(&tasklist_lock),
1629 * neither inside nor outside.
1631 static inline void task_lock(struct task_struct *p)
1633 spin_lock(&p->alloc_lock);
1636 static inline void task_unlock(struct task_struct *p)
1638 spin_unlock(&p->alloc_lock);
1641 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1642 unsigned long *flags);
1644 static inline void unlock_task_sighand(struct task_struct *tsk,
1645 unsigned long *flags)
1647 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1650 #ifndef __HAVE_THREAD_FUNCTIONS
1652 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
1653 #define task_stack_page(task) ((task)->stack)
1655 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1657 *task_thread_info(p) = *task_thread_info(org);
1658 task_thread_info(p)->task = p;
1661 static inline unsigned long *end_of_stack(struct task_struct *p)
1663 return (unsigned long *)(task_thread_info(p) + 1);
1668 /* set thread flags in other task's structures
1669 * - see asm/thread_info.h for TIF_xxxx flags available
1671 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1673 set_ti_thread_flag(task_thread_info(tsk), flag);
1676 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1678 clear_ti_thread_flag(task_thread_info(tsk), flag);
1681 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1683 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1686 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1688 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1691 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1693 return test_ti_thread_flag(task_thread_info(tsk), flag);
1696 static inline void set_tsk_need_resched(struct task_struct *tsk)
1698 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1701 static inline void clear_tsk_need_resched(struct task_struct *tsk)
1703 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1706 static inline int signal_pending(struct task_struct *p)
1708 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1711 static inline int need_resched(void)
1713 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1717 * cond_resched() and cond_resched_lock(): latency reduction via
1718 * explicit rescheduling in places that are safe. The return
1719 * value indicates whether a reschedule was done in fact.
1720 * cond_resched_lock() will drop the spinlock before scheduling,
1721 * cond_resched_softirq() will enable bhs before scheduling.
1723 extern int cond_resched(void);
1724 extern int cond_resched_lock(spinlock_t * lock);
1725 extern int cond_resched_softirq(void);
1728 * Does a critical section need to be broken due to another
1731 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1732 # define need_lockbreak(lock) ((lock)->break_lock)
1734 # define need_lockbreak(lock) 0
1738 * Does a critical section need to be broken due to another
1739 * task waiting or preemption being signalled:
1741 static inline int lock_need_resched(spinlock_t *lock)
1743 if (need_lockbreak(lock) || need_resched())
1749 * Reevaluate whether the task has signals pending delivery.
1750 * Wake the task if so.
1751 * This is required every time the blocked sigset_t changes.
1752 * callers must hold sighand->siglock.
1754 extern void recalc_sigpending_and_wake(struct task_struct *t);
1755 extern void recalc_sigpending(void);
1757 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1760 * Wrappers for p->thread_info->cpu access. No-op on UP.
1764 static inline unsigned int task_cpu(const struct task_struct *p)
1766 return task_thread_info(p)->cpu;
1769 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
1773 static inline unsigned int task_cpu(const struct task_struct *p)
1778 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1782 #endif /* CONFIG_SMP */
1784 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1785 extern void arch_pick_mmap_layout(struct mm_struct *mm);
1787 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1789 mm->mmap_base = TASK_UNMAPPED_BASE;
1790 mm->get_unmapped_area = arch_get_unmapped_area;
1791 mm->unmap_area = arch_unmap_area;
1795 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1796 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1798 extern int sched_mc_power_savings, sched_smt_power_savings;
1800 extern void normalize_rt_tasks(void);
1802 #ifdef CONFIG_FAIR_GROUP_SCHED
1804 extern struct task_group init_task_group;
1806 extern struct task_group *sched_create_group(void);
1807 extern void sched_destroy_group(struct task_group *tg);
1808 extern void sched_move_task(struct task_struct *tsk);
1809 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
1810 extern unsigned long sched_group_shares(struct task_group *tg);
1814 #ifdef CONFIG_TASK_XACCT
1815 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
1820 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
1825 static inline void inc_syscr(struct task_struct *tsk)
1830 static inline void inc_syscw(struct task_struct *tsk)
1835 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
1839 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
1843 static inline void inc_syscr(struct task_struct *tsk)
1847 static inline void inc_syscw(struct task_struct *tsk)
1852 #endif /* __KERNEL__ */