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 */
34 #define SCHED_NORMAL 0
38 /* SCHED_ISO: reserved but not implemented yet */
47 #include <asm/param.h> /* for HZ */
49 #include <linux/capability.h>
50 #include <linux/threads.h>
51 #include <linux/kernel.h>
52 #include <linux/types.h>
53 #include <linux/timex.h>
54 #include <linux/jiffies.h>
55 #include <linux/rbtree.h>
56 #include <linux/thread_info.h>
57 #include <linux/cpumask.h>
58 #include <linux/errno.h>
59 #include <linux/nodemask.h>
60 #include <linux/mm_types.h>
62 #include <asm/system.h>
63 #include <asm/semaphore.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/securebits.h>
72 #include <linux/fs_struct.h>
73 #include <linux/compiler.h>
74 #include <linux/completion.h>
75 #include <linux/pid.h>
76 #include <linux/percpu.h>
77 #include <linux/topology.h>
78 #include <linux/proportions.h>
79 #include <linux/seccomp.h>
80 #include <linux/rcupdate.h>
81 #include <linux/futex.h>
82 #include <linux/rtmutex.h>
84 #include <linux/time.h>
85 #include <linux/param.h>
86 #include <linux/resource.h>
87 #include <linux/timer.h>
88 #include <linux/hrtimer.h>
89 #include <linux/task_io_accounting.h>
90 #include <linux/kobject.h>
92 #include <asm/processor.h>
95 struct futex_pi_state;
99 * List of flags we want to share for kernel threads,
100 * if only because they are not used by them anyway.
102 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
105 * These are the constant used to fake the fixed-point load-average
106 * counting. Some notes:
107 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
108 * a load-average precision of 10 bits integer + 11 bits fractional
109 * - if you want to count load-averages more often, you need more
110 * precision, or rounding will get you. With 2-second counting freq,
111 * the EXP_n values would be 1981, 2034 and 2043 if still using only
114 extern unsigned long avenrun[]; /* Load averages */
116 #define FSHIFT 11 /* nr of bits of precision */
117 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
118 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
119 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
120 #define EXP_5 2014 /* 1/exp(5sec/5min) */
121 #define EXP_15 2037 /* 1/exp(5sec/15min) */
123 #define CALC_LOAD(load,exp,n) \
125 load += n*(FIXED_1-exp); \
128 extern unsigned long total_forks;
129 extern int nr_threads;
130 DECLARE_PER_CPU(unsigned long, process_counts);
131 extern int nr_processes(void);
132 extern unsigned long nr_running(void);
133 extern unsigned long nr_uninterruptible(void);
134 extern unsigned long nr_active(void);
135 extern unsigned long nr_iowait(void);
136 extern unsigned long weighted_cpuload(const int cpu);
141 #ifdef CONFIG_SCHED_DEBUG
142 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
143 extern void proc_sched_set_task(struct task_struct *p);
145 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
148 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
151 static inline void proc_sched_set_task(struct task_struct *p)
155 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
161 * Task state bitmask. NOTE! These bits are also
162 * encoded in fs/proc/array.c: get_task_state().
164 * We have two separate sets of flags: task->state
165 * is about runnability, while task->exit_state are
166 * about the task exiting. Confusing, but this way
167 * modifying one set can't modify the other one by
170 #define TASK_RUNNING 0
171 #define TASK_INTERRUPTIBLE 1
172 #define TASK_UNINTERRUPTIBLE 2
173 #define TASK_STOPPED 4
174 #define TASK_TRACED 8
175 /* in tsk->exit_state */
176 #define EXIT_ZOMBIE 16
178 /* in tsk->state again */
181 #define __set_task_state(tsk, state_value) \
182 do { (tsk)->state = (state_value); } while (0)
183 #define set_task_state(tsk, state_value) \
184 set_mb((tsk)->state, (state_value))
187 * set_current_state() includes a barrier so that the write of current->state
188 * is correctly serialised wrt the caller's subsequent test of whether to
191 * set_current_state(TASK_UNINTERRUPTIBLE);
192 * if (do_i_need_to_sleep())
195 * If the caller does not need such serialisation then use __set_current_state()
197 #define __set_current_state(state_value) \
198 do { current->state = (state_value); } while (0)
199 #define set_current_state(state_value) \
200 set_mb(current->state, (state_value))
202 /* Task command name length */
203 #define TASK_COMM_LEN 16
205 #include <linux/spinlock.h>
208 * This serializes "schedule()" and also protects
209 * the run-queue from deletions/modifications (but
210 * _adding_ to the beginning of the run-queue has
213 extern rwlock_t tasklist_lock;
214 extern spinlock_t mmlist_lock;
218 extern void sched_init(void);
219 extern void sched_init_smp(void);
220 extern void init_idle(struct task_struct *idle, int cpu);
221 extern void init_idle_bootup_task(struct task_struct *idle);
223 extern cpumask_t nohz_cpu_mask;
224 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
225 extern int select_nohz_load_balancer(int cpu);
227 static inline int select_nohz_load_balancer(int cpu)
234 * Only dump TASK_* tasks. (0 for all tasks)
236 extern void show_state_filter(unsigned long state_filter);
238 static inline void show_state(void)
240 show_state_filter(0);
243 extern void show_regs(struct pt_regs *);
246 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
247 * task), SP is the stack pointer of the first frame that should be shown in the back
248 * trace (or NULL if the entire call-chain of the task should be shown).
250 extern void show_stack(struct task_struct *task, unsigned long *sp);
252 void io_schedule(void);
253 long io_schedule_timeout(long timeout);
255 extern void cpu_init (void);
256 extern void trap_init(void);
257 extern void account_process_tick(struct task_struct *task, int user);
258 extern void update_process_times(int user);
259 extern void scheduler_tick(void);
261 extern void sched_show_task(struct task_struct *p);
263 #ifdef CONFIG_DETECT_SOFTLOCKUP
264 extern void softlockup_tick(void);
265 extern void spawn_softlockup_task(void);
266 extern void touch_softlockup_watchdog(void);
267 extern void touch_all_softlockup_watchdogs(void);
268 extern int softlockup_thresh;
269 extern unsigned long sysctl_hung_task_check_count;
270 extern unsigned long sysctl_hung_task_timeout_secs;
271 extern long sysctl_hung_task_warnings;
273 static inline void softlockup_tick(void)
276 static inline void spawn_softlockup_task(void)
279 static inline void touch_softlockup_watchdog(void)
282 static inline void touch_all_softlockup_watchdogs(void)
288 /* Attach to any functions which should be ignored in wchan output. */
289 #define __sched __attribute__((__section__(".sched.text")))
291 /* Linker adds these: start and end of __sched functions */
292 extern char __sched_text_start[], __sched_text_end[];
294 /* Is this address in the __sched functions? */
295 extern int in_sched_functions(unsigned long addr);
297 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
298 extern signed long FASTCALL(schedule_timeout(signed long timeout));
299 extern signed long schedule_timeout_interruptible(signed long timeout);
300 extern signed long schedule_timeout_uninterruptible(signed long timeout);
301 asmlinkage void schedule(void);
304 struct user_namespace;
306 /* Maximum number of active map areas.. This is a random (large) number */
307 #define DEFAULT_MAX_MAP_COUNT 65536
309 extern int sysctl_max_map_count;
311 #include <linux/aio.h>
314 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
315 unsigned long, unsigned long);
317 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
318 unsigned long len, unsigned long pgoff,
319 unsigned long flags);
320 extern void arch_unmap_area(struct mm_struct *, unsigned long);
321 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
323 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
325 * The mm counters are not protected by its page_table_lock,
326 * so must be incremented atomically.
328 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
329 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
330 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
331 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
332 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
334 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
336 * The mm counters are protected by its page_table_lock,
337 * so can be incremented directly.
339 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
340 #define get_mm_counter(mm, member) ((mm)->_##member)
341 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
342 #define inc_mm_counter(mm, member) (mm)->_##member++
343 #define dec_mm_counter(mm, member) (mm)->_##member--
345 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
347 #define get_mm_rss(mm) \
348 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
349 #define update_hiwater_rss(mm) do { \
350 unsigned long _rss = get_mm_rss(mm); \
351 if ((mm)->hiwater_rss < _rss) \
352 (mm)->hiwater_rss = _rss; \
354 #define update_hiwater_vm(mm) do { \
355 if ((mm)->hiwater_vm < (mm)->total_vm) \
356 (mm)->hiwater_vm = (mm)->total_vm; \
359 extern void set_dumpable(struct mm_struct *mm, int value);
360 extern int get_dumpable(struct mm_struct *mm);
364 #define MMF_DUMPABLE 0 /* core dump is permitted */
365 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
366 #define MMF_DUMPABLE_BITS 2
368 /* coredump filter bits */
369 #define MMF_DUMP_ANON_PRIVATE 2
370 #define MMF_DUMP_ANON_SHARED 3
371 #define MMF_DUMP_MAPPED_PRIVATE 4
372 #define MMF_DUMP_MAPPED_SHARED 5
373 #define MMF_DUMP_ELF_HEADERS 6
374 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
375 #define MMF_DUMP_FILTER_BITS 5
376 #define MMF_DUMP_FILTER_MASK \
377 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
378 #define MMF_DUMP_FILTER_DEFAULT \
379 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
381 struct sighand_struct {
383 struct k_sigaction action[_NSIG];
385 wait_queue_head_t signalfd_wqh;
388 struct pacct_struct {
391 unsigned long ac_mem;
392 cputime_t ac_utime, ac_stime;
393 unsigned long ac_minflt, ac_majflt;
397 * NOTE! "signal_struct" does not have it's own
398 * locking, because a shared signal_struct always
399 * implies a shared sighand_struct, so locking
400 * sighand_struct is always a proper superset of
401 * the locking of signal_struct.
403 struct signal_struct {
407 wait_queue_head_t wait_chldexit; /* for wait4() */
409 /* current thread group signal load-balancing target: */
410 struct task_struct *curr_target;
412 /* shared signal handling: */
413 struct sigpending shared_pending;
415 /* thread group exit support */
418 * - notify group_exit_task when ->count is equal to notify_count
419 * - everyone except group_exit_task is stopped during signal delivery
420 * of fatal signals, group_exit_task processes the signal.
422 struct task_struct *group_exit_task;
425 /* thread group stop support, overloads group_exit_code too */
426 int group_stop_count;
427 unsigned int flags; /* see SIGNAL_* flags below */
429 /* POSIX.1b Interval Timers */
430 struct list_head posix_timers;
432 /* ITIMER_REAL timer for the process */
433 struct hrtimer real_timer;
434 struct task_struct *tsk;
435 ktime_t it_real_incr;
437 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
438 cputime_t it_prof_expires, it_virt_expires;
439 cputime_t it_prof_incr, it_virt_incr;
441 /* job control IDs */
444 * pgrp and session fields are deprecated.
445 * use the task_session_Xnr and task_pgrp_Xnr routines below
449 pid_t pgrp __deprecated;
453 struct pid *tty_old_pgrp;
456 pid_t session __deprecated;
460 /* boolean value for session group leader */
463 struct tty_struct *tty; /* NULL if no tty */
466 * Cumulative resource counters for dead threads in the group,
467 * and for reaped dead child processes forked by this group.
468 * Live threads maintain their own counters and add to these
469 * in __exit_signal, except for the group leader.
471 cputime_t utime, stime, cutime, cstime;
474 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
475 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
476 unsigned long inblock, oublock, cinblock, coublock;
479 * Cumulative ns of scheduled CPU time for dead threads in the
480 * group, not including a zombie group leader. (This only differs
481 * from jiffies_to_ns(utime + stime) if sched_clock uses something
482 * other than jiffies.)
484 unsigned long long sum_sched_runtime;
487 * We don't bother to synchronize most readers of this at all,
488 * because there is no reader checking a limit that actually needs
489 * to get both rlim_cur and rlim_max atomically, and either one
490 * alone is a single word that can safely be read normally.
491 * getrlimit/setrlimit use task_lock(current->group_leader) to
492 * protect this instead of the siglock, because they really
493 * have no need to disable irqs.
495 struct rlimit rlim[RLIM_NLIMITS];
497 struct list_head cpu_timers[3];
499 /* keep the process-shared keyrings here so that they do the right
500 * thing in threads created with CLONE_THREAD */
502 struct key *session_keyring; /* keyring inherited over fork */
503 struct key *process_keyring; /* keyring private to this process */
505 #ifdef CONFIG_BSD_PROCESS_ACCT
506 struct pacct_struct pacct; /* per-process accounting information */
508 #ifdef CONFIG_TASKSTATS
509 struct taskstats *stats;
513 struct tty_audit_buf *tty_audit_buf;
517 /* Context switch must be unlocked if interrupts are to be enabled */
518 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
519 # define __ARCH_WANT_UNLOCKED_CTXSW
523 * Bits in flags field of signal_struct.
525 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
526 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
527 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
528 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
531 * Some day this will be a full-fledged user tracking system..
534 atomic_t __count; /* reference count */
535 atomic_t processes; /* How many processes does this user have? */
536 atomic_t files; /* How many open files does this user have? */
537 atomic_t sigpending; /* How many pending signals does this user have? */
538 #ifdef CONFIG_INOTIFY_USER
539 atomic_t inotify_watches; /* How many inotify watches does this user have? */
540 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
542 #ifdef CONFIG_POSIX_MQUEUE
543 /* protected by mq_lock */
544 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
546 unsigned long locked_shm; /* How many pages of mlocked shm ? */
549 struct key *uid_keyring; /* UID specific keyring */
550 struct key *session_keyring; /* UID's default session keyring */
553 /* Hash table maintenance information */
554 struct hlist_node uidhash_node;
557 #ifdef CONFIG_FAIR_USER_SCHED
558 struct task_group *tg;
561 struct work_struct work;
566 extern int uids_sysfs_init(void);
568 extern struct user_struct *find_user(uid_t);
570 extern struct user_struct root_user;
571 #define INIT_USER (&root_user)
573 struct backing_dev_info;
574 struct reclaim_state;
576 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
578 /* cumulative counters */
579 unsigned long pcount; /* # of times run on this cpu */
580 unsigned long long cpu_time, /* time spent on the cpu */
581 run_delay; /* time spent waiting on a runqueue */
584 unsigned long long last_arrival,/* when we last ran on a cpu */
585 last_queued; /* when we were last queued to run */
586 #ifdef CONFIG_SCHEDSTATS
588 unsigned int bkl_count;
591 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
593 #ifdef CONFIG_SCHEDSTATS
594 extern const struct file_operations proc_schedstat_operations;
595 #endif /* CONFIG_SCHEDSTATS */
597 #ifdef CONFIG_TASK_DELAY_ACCT
598 struct task_delay_info {
600 unsigned int flags; /* Private per-task flags */
602 /* For each stat XXX, add following, aligned appropriately
604 * struct timespec XXX_start, XXX_end;
608 * Atomicity of updates to XXX_delay, XXX_count protected by
609 * single lock above (split into XXX_lock if contention is an issue).
613 * XXX_count is incremented on every XXX operation, the delay
614 * associated with the operation is added to XXX_delay.
615 * XXX_delay contains the accumulated delay time in nanoseconds.
617 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
618 u64 blkio_delay; /* wait for sync block io completion */
619 u64 swapin_delay; /* wait for swapin block io completion */
620 u32 blkio_count; /* total count of the number of sync block */
621 /* io operations performed */
622 u32 swapin_count; /* total count of the number of swapin block */
623 /* io operations performed */
625 #endif /* CONFIG_TASK_DELAY_ACCT */
627 static inline int sched_info_on(void)
629 #ifdef CONFIG_SCHEDSTATS
631 #elif defined(CONFIG_TASK_DELAY_ACCT)
632 extern int delayacct_on;
647 * sched-domains (multiprocessor balancing) declarations:
651 * Increase resolution of nice-level calculations:
653 #define SCHED_LOAD_SHIFT 10
654 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
656 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
659 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
660 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
661 #define SD_BALANCE_EXEC 4 /* Balance on exec */
662 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
663 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
664 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
665 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
666 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
667 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
668 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
669 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
671 #define BALANCE_FOR_MC_POWER \
672 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
674 #define BALANCE_FOR_PKG_POWER \
675 ((sched_mc_power_savings || sched_smt_power_savings) ? \
676 SD_POWERSAVINGS_BALANCE : 0)
678 #define test_sd_parent(sd, flag) ((sd->parent && \
679 (sd->parent->flags & flag)) ? 1 : 0)
683 struct sched_group *next; /* Must be a circular list */
687 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
688 * single CPU. This is read only (except for setup, hotplug CPU).
689 * Note : Never change cpu_power without recompute its reciprocal
691 unsigned int __cpu_power;
693 * reciprocal value of cpu_power to avoid expensive divides
694 * (see include/linux/reciprocal_div.h)
696 u32 reciprocal_cpu_power;
699 struct sched_domain {
700 /* These fields must be setup */
701 struct sched_domain *parent; /* top domain must be null terminated */
702 struct sched_domain *child; /* bottom domain must be null terminated */
703 struct sched_group *groups; /* the balancing groups of the domain */
704 cpumask_t span; /* span of all CPUs in this domain */
705 unsigned long min_interval; /* Minimum balance interval ms */
706 unsigned long max_interval; /* Maximum balance interval ms */
707 unsigned int busy_factor; /* less balancing by factor if busy */
708 unsigned int imbalance_pct; /* No balance until over watermark */
709 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
710 unsigned int busy_idx;
711 unsigned int idle_idx;
712 unsigned int newidle_idx;
713 unsigned int wake_idx;
714 unsigned int forkexec_idx;
715 int flags; /* See SD_* */
717 /* Runtime fields. */
718 unsigned long last_balance; /* init to jiffies. units in jiffies */
719 unsigned int balance_interval; /* initialise to 1. units in ms. */
720 unsigned int nr_balance_failed; /* initialise to 0 */
722 #ifdef CONFIG_SCHEDSTATS
723 /* load_balance() stats */
724 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
725 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
726 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
727 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
728 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
729 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
730 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
731 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
733 /* Active load balancing */
734 unsigned int alb_count;
735 unsigned int alb_failed;
736 unsigned int alb_pushed;
738 /* SD_BALANCE_EXEC stats */
739 unsigned int sbe_count;
740 unsigned int sbe_balanced;
741 unsigned int sbe_pushed;
743 /* SD_BALANCE_FORK stats */
744 unsigned int sbf_count;
745 unsigned int sbf_balanced;
746 unsigned int sbf_pushed;
748 /* try_to_wake_up() stats */
749 unsigned int ttwu_wake_remote;
750 unsigned int ttwu_move_affine;
751 unsigned int ttwu_move_balance;
755 extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new);
757 #endif /* CONFIG_SMP */
760 * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
761 * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
762 * task of nice 0 or enough lower priority tasks to bring up the
765 static inline int above_background_load(void)
769 for_each_online_cpu(cpu) {
770 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
776 struct io_context; /* See blkdev.h */
777 #define NGROUPS_SMALL 32
778 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
782 gid_t small_block[NGROUPS_SMALL];
788 * get_group_info() must be called with the owning task locked (via task_lock())
789 * when task != current. The reason being that the vast majority of callers are
790 * looking at current->group_info, which can not be changed except by the
791 * current task. Changing current->group_info requires the task lock, too.
793 #define get_group_info(group_info) do { \
794 atomic_inc(&(group_info)->usage); \
797 #define put_group_info(group_info) do { \
798 if (atomic_dec_and_test(&(group_info)->usage)) \
799 groups_free(group_info); \
802 extern struct group_info *groups_alloc(int gidsetsize);
803 extern void groups_free(struct group_info *group_info);
804 extern int set_current_groups(struct group_info *group_info);
805 extern int groups_search(struct group_info *group_info, gid_t grp);
806 /* access the groups "array" with this macro */
807 #define GROUP_AT(gi, i) \
808 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
810 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
811 extern void prefetch_stack(struct task_struct *t);
813 static inline void prefetch_stack(struct task_struct *t) { }
816 struct audit_context; /* See audit.c */
818 struct pipe_inode_info;
819 struct uts_namespace;
825 const struct sched_class *next;
827 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
828 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
829 void (*yield_task) (struct rq *rq);
830 int (*select_task_rq)(struct task_struct *p, int sync);
832 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
834 struct task_struct * (*pick_next_task) (struct rq *rq);
835 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
838 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
839 struct rq *busiest, unsigned long max_load_move,
840 struct sched_domain *sd, enum cpu_idle_type idle,
841 int *all_pinned, int *this_best_prio);
843 int (*move_one_task) (struct rq *this_rq, int this_cpu,
844 struct rq *busiest, struct sched_domain *sd,
845 enum cpu_idle_type idle);
846 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
847 void (*post_schedule) (struct rq *this_rq);
848 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
851 void (*set_curr_task) (struct rq *rq);
852 void (*task_tick) (struct rq *rq, struct task_struct *p);
853 void (*task_new) (struct rq *rq, struct task_struct *p);
854 void (*set_cpus_allowed)(struct task_struct *p, cpumask_t *newmask);
856 void (*join_domain)(struct rq *rq);
857 void (*leave_domain)(struct rq *rq);
859 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
861 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
863 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
864 int oldprio, int running);
868 unsigned long weight, inv_weight;
872 * CFS stats for a schedulable entity (task, task-group etc)
874 * Current field usage histogram:
881 struct sched_entity {
882 struct load_weight load; /* for load-balancing */
883 struct rb_node run_node;
887 u64 sum_exec_runtime;
889 u64 prev_sum_exec_runtime;
891 #ifdef CONFIG_SCHEDSTATS
897 s64 sum_sleep_runtime;
905 u64 nr_migrations_cold;
906 u64 nr_failed_migrations_affine;
907 u64 nr_failed_migrations_running;
908 u64 nr_failed_migrations_hot;
909 u64 nr_forced_migrations;
910 u64 nr_forced2_migrations;
914 u64 nr_wakeups_migrate;
915 u64 nr_wakeups_local;
916 u64 nr_wakeups_remote;
917 u64 nr_wakeups_affine;
918 u64 nr_wakeups_affine_attempts;
919 u64 nr_wakeups_passive;
923 #ifdef CONFIG_FAIR_GROUP_SCHED
924 struct sched_entity *parent;
925 /* rq on which this entity is (to be) queued: */
926 struct cfs_rq *cfs_rq;
927 /* rq "owned" by this entity/group: */
932 struct sched_rt_entity {
933 struct list_head run_list;
934 unsigned int time_slice;
935 unsigned long timeout;
939 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
942 unsigned int flags; /* per process flags, defined below */
945 int lock_depth; /* BKL lock depth */
948 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
953 int prio, static_prio, normal_prio;
954 const struct sched_class *sched_class;
955 struct sched_entity se;
956 struct sched_rt_entity rt;
958 #ifdef CONFIG_PREEMPT_NOTIFIERS
959 /* list of struct preempt_notifier: */
960 struct hlist_head preempt_notifiers;
963 unsigned short ioprio;
965 * fpu_counter contains the number of consecutive context switches
966 * that the FPU is used. If this is over a threshold, the lazy fpu
967 * saving becomes unlazy to save the trap. This is an unsigned char
968 * so that after 256 times the counter wraps and the behavior turns
969 * lazy again; this to deal with bursty apps that only use FPU for
972 unsigned char fpu_counter;
973 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
974 #ifdef CONFIG_BLK_DEV_IO_TRACE
975 unsigned int btrace_seq;
979 cpumask_t cpus_allowed;
982 #ifdef CONFIG_PREEMPT_RCU
983 int rcu_read_lock_nesting;
985 #endif /* #ifdef CONFIG_PREEMPT_RCU */
987 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
988 struct sched_info sched_info;
991 struct list_head tasks;
993 * ptrace_list/ptrace_children forms the list of my children
994 * that were stolen by a ptracer.
996 struct list_head ptrace_children;
997 struct list_head ptrace_list;
999 struct mm_struct *mm, *active_mm;
1002 struct linux_binfmt *binfmt;
1004 int exit_code, exit_signal;
1005 int pdeath_signal; /* The signal sent when the parent dies */
1007 unsigned int personality;
1008 unsigned did_exec:1;
1012 #ifdef CONFIG_CC_STACKPROTECTOR
1013 /* Canary value for the -fstack-protector gcc feature */
1014 unsigned long stack_canary;
1017 * pointers to (original) parent process, youngest child, younger sibling,
1018 * older sibling, respectively. (p->father can be replaced with
1021 struct task_struct *real_parent; /* real parent process (when being debugged) */
1022 struct task_struct *parent; /* parent process */
1024 * children/sibling forms the list of my children plus the
1025 * tasks I'm ptracing.
1027 struct list_head children; /* list of my children */
1028 struct list_head sibling; /* linkage in my parent's children list */
1029 struct task_struct *group_leader; /* threadgroup leader */
1031 /* PID/PID hash table linkage. */
1032 struct pid_link pids[PIDTYPE_MAX];
1033 struct list_head thread_group;
1035 struct completion *vfork_done; /* for vfork() */
1036 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1037 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1039 unsigned int rt_priority;
1040 cputime_t utime, stime, utimescaled, stimescaled;
1042 cputime_t prev_utime, prev_stime;
1043 unsigned long nvcsw, nivcsw; /* context switch counts */
1044 struct timespec start_time; /* monotonic time */
1045 struct timespec real_start_time; /* boot based time */
1046 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1047 unsigned long min_flt, maj_flt;
1049 cputime_t it_prof_expires, it_virt_expires;
1050 unsigned long long it_sched_expires;
1051 struct list_head cpu_timers[3];
1053 /* process credentials */
1054 uid_t uid,euid,suid,fsuid;
1055 gid_t gid,egid,sgid,fsgid;
1056 struct group_info *group_info;
1057 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
1058 unsigned keep_capabilities:1;
1059 struct user_struct *user;
1061 struct key *request_key_auth; /* assumed request_key authority */
1062 struct key *thread_keyring; /* keyring private to this thread */
1063 unsigned char jit_keyring; /* default keyring to attach requested keys to */
1065 char comm[TASK_COMM_LEN]; /* executable name excluding path
1066 - access with [gs]et_task_comm (which lock
1067 it with task_lock())
1068 - initialized normally by flush_old_exec */
1069 /* file system info */
1070 int link_count, total_link_count;
1071 #ifdef CONFIG_SYSVIPC
1073 struct sysv_sem sysvsem;
1075 #ifdef CONFIG_DETECT_SOFTLOCKUP
1076 /* hung task detection */
1077 unsigned long last_switch_timestamp;
1078 unsigned long last_switch_count;
1080 /* CPU-specific state of this task */
1081 struct thread_struct thread;
1082 /* filesystem information */
1083 struct fs_struct *fs;
1084 /* open file information */
1085 struct files_struct *files;
1087 struct nsproxy *nsproxy;
1088 /* signal handlers */
1089 struct signal_struct *signal;
1090 struct sighand_struct *sighand;
1092 sigset_t blocked, real_blocked;
1093 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */
1094 struct sigpending pending;
1096 unsigned long sas_ss_sp;
1098 int (*notifier)(void *priv);
1099 void *notifier_data;
1100 sigset_t *notifier_mask;
1101 #ifdef CONFIG_SECURITY
1104 struct audit_context *audit_context;
1107 /* Thread group tracking */
1110 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1111 spinlock_t alloc_lock;
1113 /* Protection of the PI data structures: */
1116 #ifdef CONFIG_RT_MUTEXES
1117 /* PI waiters blocked on a rt_mutex held by this task */
1118 struct plist_head pi_waiters;
1119 /* Deadlock detection and priority inheritance handling */
1120 struct rt_mutex_waiter *pi_blocked_on;
1123 #ifdef CONFIG_DEBUG_MUTEXES
1124 /* mutex deadlock detection */
1125 struct mutex_waiter *blocked_on;
1127 #ifdef CONFIG_TRACE_IRQFLAGS
1128 unsigned int irq_events;
1129 int hardirqs_enabled;
1130 unsigned long hardirq_enable_ip;
1131 unsigned int hardirq_enable_event;
1132 unsigned long hardirq_disable_ip;
1133 unsigned int hardirq_disable_event;
1134 int softirqs_enabled;
1135 unsigned long softirq_disable_ip;
1136 unsigned int softirq_disable_event;
1137 unsigned long softirq_enable_ip;
1138 unsigned int softirq_enable_event;
1139 int hardirq_context;
1140 int softirq_context;
1142 #ifdef CONFIG_LOCKDEP
1143 # define MAX_LOCK_DEPTH 30UL
1146 struct held_lock held_locks[MAX_LOCK_DEPTH];
1147 unsigned int lockdep_recursion;
1150 /* journalling filesystem info */
1153 /* stacked block device info */
1154 struct bio *bio_list, **bio_tail;
1157 struct reclaim_state *reclaim_state;
1159 struct backing_dev_info *backing_dev_info;
1161 struct io_context *io_context;
1163 unsigned long ptrace_message;
1164 siginfo_t *last_siginfo; /* For ptrace use. */
1165 #ifdef CONFIG_TASK_XACCT
1166 /* i/o counters(bytes read/written, #syscalls */
1167 u64 rchar, wchar, syscr, syscw;
1169 struct task_io_accounting ioac;
1170 #if defined(CONFIG_TASK_XACCT)
1171 u64 acct_rss_mem1; /* accumulated rss usage */
1172 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1173 cputime_t acct_stimexpd;/* stime since last update */
1176 struct mempolicy *mempolicy;
1179 #ifdef CONFIG_CPUSETS
1180 nodemask_t mems_allowed;
1181 int cpuset_mems_generation;
1182 int cpuset_mem_spread_rotor;
1184 #ifdef CONFIG_CGROUPS
1185 /* Control Group info protected by css_set_lock */
1186 struct css_set *cgroups;
1187 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1188 struct list_head cg_list;
1191 struct robust_list_head __user *robust_list;
1192 #ifdef CONFIG_COMPAT
1193 struct compat_robust_list_head __user *compat_robust_list;
1195 struct list_head pi_state_list;
1196 struct futex_pi_state *pi_state_cache;
1198 atomic_t fs_excl; /* holding fs exclusive resources */
1199 struct rcu_head rcu;
1202 * cache last used pipe for splice
1204 struct pipe_inode_info *splice_pipe;
1205 #ifdef CONFIG_TASK_DELAY_ACCT
1206 struct task_delay_info *delays;
1208 #ifdef CONFIG_FAULT_INJECTION
1211 struct prop_local_single dirties;
1215 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1216 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1217 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1218 * values are inverted: lower p->prio value means higher priority.
1220 * The MAX_USER_RT_PRIO value allows the actual maximum
1221 * RT priority to be separate from the value exported to
1222 * user-space. This allows kernel threads to set their
1223 * priority to a value higher than any user task. Note:
1224 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1227 #define MAX_USER_RT_PRIO 100
1228 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1230 #define MAX_PRIO (MAX_RT_PRIO + 40)
1231 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1233 static inline int rt_prio(int prio)
1235 if (unlikely(prio < MAX_RT_PRIO))
1240 static inline int rt_task(struct task_struct *p)
1242 return rt_prio(p->prio);
1245 static inline void set_task_session(struct task_struct *tsk, pid_t session)
1247 tsk->signal->__session = session;
1250 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1252 tsk->signal->__pgrp = pgrp;
1255 static inline struct pid *task_pid(struct task_struct *task)
1257 return task->pids[PIDTYPE_PID].pid;
1260 static inline struct pid *task_tgid(struct task_struct *task)
1262 return task->group_leader->pids[PIDTYPE_PID].pid;
1265 static inline struct pid *task_pgrp(struct task_struct *task)
1267 return task->group_leader->pids[PIDTYPE_PGID].pid;
1270 static inline struct pid *task_session(struct task_struct *task)
1272 return task->group_leader->pids[PIDTYPE_SID].pid;
1275 struct pid_namespace;
1278 * the helpers to get the task's different pids as they are seen
1279 * from various namespaces
1281 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1282 * task_xid_vnr() : virtual id, i.e. the id seen from the namespace the task
1283 * belongs to. this only makes sence when called in the
1284 * context of the task that belongs to the same namespace;
1285 * task_xid_nr_ns() : id seen from the ns specified;
1287 * set_task_vxid() : assigns a virtual id to a task;
1289 * see also pid_nr() etc in include/linux/pid.h
1292 static inline pid_t task_pid_nr(struct task_struct *tsk)
1297 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1299 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1301 return pid_vnr(task_pid(tsk));
1305 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1310 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1312 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1314 return pid_vnr(task_tgid(tsk));
1318 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1320 return tsk->signal->__pgrp;
1323 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1325 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1327 return pid_vnr(task_pgrp(tsk));
1331 static inline pid_t task_session_nr(struct task_struct *tsk)
1333 return tsk->signal->__session;
1336 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1338 static inline pid_t task_session_vnr(struct task_struct *tsk)
1340 return pid_vnr(task_session(tsk));
1345 * pid_alive - check that a task structure is not stale
1346 * @p: Task structure to be checked.
1348 * Test if a process is not yet dead (at most zombie state)
1349 * If pid_alive fails, then pointers within the task structure
1350 * can be stale and must not be dereferenced.
1352 static inline int pid_alive(struct task_struct *p)
1354 return p->pids[PIDTYPE_PID].pid != NULL;
1358 * is_global_init - check if a task structure is init
1359 * @tsk: Task structure to be checked.
1361 * Check if a task structure is the first user space task the kernel created.
1363 static inline int is_global_init(struct task_struct *tsk)
1365 return tsk->pid == 1;
1369 * is_container_init:
1370 * check whether in the task is init in its own pid namespace.
1372 extern int is_container_init(struct task_struct *tsk);
1374 extern struct pid *cad_pid;
1376 extern void free_task(struct task_struct *tsk);
1377 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1379 extern void __put_task_struct(struct task_struct *t);
1381 static inline void put_task_struct(struct task_struct *t)
1383 if (atomic_dec_and_test(&t->usage))
1384 __put_task_struct(t);
1390 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1391 /* Not implemented yet, only for 486*/
1392 #define PF_STARTING 0x00000002 /* being created */
1393 #define PF_EXITING 0x00000004 /* getting shut down */
1394 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1395 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1396 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1397 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1398 #define PF_DUMPCORE 0x00000200 /* dumped core */
1399 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1400 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1401 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1402 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1403 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1404 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1405 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1406 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1407 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1408 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1409 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1410 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1411 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1412 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1413 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1414 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1415 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1416 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1419 * Only the _current_ task can read/write to tsk->flags, but other
1420 * tasks can access tsk->flags in readonly mode for example
1421 * with tsk_used_math (like during threaded core dumping).
1422 * There is however an exception to this rule during ptrace
1423 * or during fork: the ptracer task is allowed to write to the
1424 * child->flags of its traced child (same goes for fork, the parent
1425 * can write to the child->flags), because we're guaranteed the
1426 * child is not running and in turn not changing child->flags
1427 * at the same time the parent does it.
1429 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1430 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1431 #define clear_used_math() clear_stopped_child_used_math(current)
1432 #define set_used_math() set_stopped_child_used_math(current)
1433 #define conditional_stopped_child_used_math(condition, child) \
1434 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1435 #define conditional_used_math(condition) \
1436 conditional_stopped_child_used_math(condition, current)
1437 #define copy_to_stopped_child_used_math(child) \
1438 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1439 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1440 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1441 #define used_math() tsk_used_math(current)
1444 extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask);
1446 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1448 if (!cpu_isset(0, new_mask))
1454 extern unsigned long long sched_clock(void);
1457 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1458 * clock constructed from sched_clock():
1460 extern unsigned long long cpu_clock(int cpu);
1462 extern unsigned long long
1463 task_sched_runtime(struct task_struct *task);
1465 /* sched_exec is called by processes performing an exec */
1467 extern void sched_exec(void);
1469 #define sched_exec() {}
1472 extern void sched_clock_idle_sleep_event(void);
1473 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1475 #ifdef CONFIG_HOTPLUG_CPU
1476 extern void idle_task_exit(void);
1478 static inline void idle_task_exit(void) {}
1481 extern void sched_idle_next(void);
1483 #ifdef CONFIG_SCHED_DEBUG
1484 extern unsigned int sysctl_sched_latency;
1485 extern unsigned int sysctl_sched_min_granularity;
1486 extern unsigned int sysctl_sched_wakeup_granularity;
1487 extern unsigned int sysctl_sched_batch_wakeup_granularity;
1488 extern unsigned int sysctl_sched_child_runs_first;
1489 extern unsigned int sysctl_sched_features;
1490 extern unsigned int sysctl_sched_migration_cost;
1491 extern unsigned int sysctl_sched_nr_migrate;
1492 #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
1493 extern unsigned int sysctl_sched_min_bal_int_shares;
1494 extern unsigned int sysctl_sched_max_bal_int_shares;
1497 int sched_nr_latency_handler(struct ctl_table *table, int write,
1498 struct file *file, void __user *buffer, size_t *length,
1502 extern unsigned int sysctl_sched_compat_yield;
1504 #ifdef CONFIG_RT_MUTEXES
1505 extern int rt_mutex_getprio(struct task_struct *p);
1506 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1507 extern void rt_mutex_adjust_pi(struct task_struct *p);
1509 static inline int rt_mutex_getprio(struct task_struct *p)
1511 return p->normal_prio;
1513 # define rt_mutex_adjust_pi(p) do { } while (0)
1516 extern void set_user_nice(struct task_struct *p, long nice);
1517 extern int task_prio(const struct task_struct *p);
1518 extern int task_nice(const struct task_struct *p);
1519 extern int can_nice(const struct task_struct *p, const int nice);
1520 extern int task_curr(const struct task_struct *p);
1521 extern int idle_cpu(int cpu);
1522 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1523 extern struct task_struct *idle_task(int cpu);
1524 extern struct task_struct *curr_task(int cpu);
1525 extern void set_curr_task(int cpu, struct task_struct *p);
1530 * The default (Linux) execution domain.
1532 extern struct exec_domain default_exec_domain;
1534 union thread_union {
1535 struct thread_info thread_info;
1536 unsigned long stack[THREAD_SIZE/sizeof(long)];
1539 #ifndef __HAVE_ARCH_KSTACK_END
1540 static inline int kstack_end(void *addr)
1542 /* Reliable end of stack detection:
1543 * Some APM bios versions misalign the stack
1545 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1549 extern union thread_union init_thread_union;
1550 extern struct task_struct init_task;
1552 extern struct mm_struct init_mm;
1554 extern struct pid_namespace init_pid_ns;
1557 * find a task by one of its numerical ids
1559 * find_task_by_pid_type_ns():
1560 * it is the most generic call - it finds a task by all id,
1561 * type and namespace specified
1562 * find_task_by_pid_ns():
1563 * finds a task by its pid in the specified namespace
1564 * find_task_by_vpid():
1565 * finds a task by its virtual pid
1566 * find_task_by_pid():
1567 * finds a task by its global pid
1569 * see also find_pid() etc in include/linux/pid.h
1572 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1573 struct pid_namespace *ns);
1575 extern struct task_struct *find_task_by_pid(pid_t nr);
1576 extern struct task_struct *find_task_by_vpid(pid_t nr);
1577 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1578 struct pid_namespace *ns);
1580 extern void __set_special_pids(pid_t session, pid_t pgrp);
1582 /* per-UID process charging. */
1583 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1584 static inline struct user_struct *get_uid(struct user_struct *u)
1586 atomic_inc(&u->__count);
1589 extern void free_uid(struct user_struct *);
1590 extern void switch_uid(struct user_struct *);
1591 extern void release_uids(struct user_namespace *ns);
1593 #include <asm/current.h>
1595 extern void do_timer(unsigned long ticks);
1597 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
1598 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
1599 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
1600 unsigned long clone_flags));
1602 extern void kick_process(struct task_struct *tsk);
1604 static inline void kick_process(struct task_struct *tsk) { }
1606 extern void sched_fork(struct task_struct *p, int clone_flags);
1607 extern void sched_dead(struct task_struct *p);
1609 extern int in_group_p(gid_t);
1610 extern int in_egroup_p(gid_t);
1612 extern void proc_caches_init(void);
1613 extern void flush_signals(struct task_struct *);
1614 extern void ignore_signals(struct task_struct *);
1615 extern void flush_signal_handlers(struct task_struct *, int force_default);
1616 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1618 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1620 unsigned long flags;
1623 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1624 ret = dequeue_signal(tsk, mask, info);
1625 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1630 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1632 extern void unblock_all_signals(void);
1633 extern void release_task(struct task_struct * p);
1634 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1635 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
1636 extern int force_sigsegv(int, struct task_struct *);
1637 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1638 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1639 extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1640 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1641 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1642 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1643 extern int kill_pid(struct pid *pid, int sig, int priv);
1644 extern int kill_proc_info(int, struct siginfo *, pid_t);
1645 extern void do_notify_parent(struct task_struct *, int);
1646 extern void force_sig(int, struct task_struct *);
1647 extern void force_sig_specific(int, struct task_struct *);
1648 extern int send_sig(int, struct task_struct *, int);
1649 extern void zap_other_threads(struct task_struct *p);
1650 extern int kill_proc(pid_t, int, int);
1651 extern struct sigqueue *sigqueue_alloc(void);
1652 extern void sigqueue_free(struct sigqueue *);
1653 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
1654 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
1655 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1656 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1658 static inline int kill_cad_pid(int sig, int priv)
1660 return kill_pid(cad_pid, sig, priv);
1663 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1664 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1665 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1666 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1668 static inline int is_si_special(const struct siginfo *info)
1670 return info <= SEND_SIG_FORCED;
1673 /* True if we are on the alternate signal stack. */
1675 static inline int on_sig_stack(unsigned long sp)
1677 return (sp - current->sas_ss_sp < current->sas_ss_size);
1680 static inline int sas_ss_flags(unsigned long sp)
1682 return (current->sas_ss_size == 0 ? SS_DISABLE
1683 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1687 * Routines for handling mm_structs
1689 extern struct mm_struct * mm_alloc(void);
1691 /* mmdrop drops the mm and the page tables */
1692 extern void FASTCALL(__mmdrop(struct mm_struct *));
1693 static inline void mmdrop(struct mm_struct * mm)
1695 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1699 /* mmput gets rid of the mappings and all user-space */
1700 extern void mmput(struct mm_struct *);
1701 /* Grab a reference to a task's mm, if it is not already going away */
1702 extern struct mm_struct *get_task_mm(struct task_struct *task);
1703 /* Remove the current tasks stale references to the old mm_struct */
1704 extern void mm_release(struct task_struct *, struct mm_struct *);
1706 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1707 extern void flush_thread(void);
1708 extern void exit_thread(void);
1710 extern void exit_files(struct task_struct *);
1711 extern void __cleanup_signal(struct signal_struct *);
1712 extern void __cleanup_sighand(struct sighand_struct *);
1713 extern void exit_itimers(struct signal_struct *);
1715 extern NORET_TYPE void do_group_exit(int);
1717 extern void daemonize(const char *, ...);
1718 extern int allow_signal(int);
1719 extern int disallow_signal(int);
1721 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1722 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1723 struct task_struct *fork_idle(int);
1725 extern void set_task_comm(struct task_struct *tsk, char *from);
1726 extern void get_task_comm(char *to, struct task_struct *tsk);
1729 extern void wait_task_inactive(struct task_struct * p);
1731 #define wait_task_inactive(p) do { } while (0)
1734 #define remove_parent(p) list_del_init(&(p)->sibling)
1735 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1737 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1739 #define for_each_process(p) \
1740 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1743 * Careful: do_each_thread/while_each_thread is a double loop so
1744 * 'break' will not work as expected - use goto instead.
1746 #define do_each_thread(g, t) \
1747 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1749 #define while_each_thread(g, t) \
1750 while ((t = next_thread(t)) != g)
1752 /* de_thread depends on thread_group_leader not being a pid based check */
1753 #define thread_group_leader(p) (p == p->group_leader)
1755 /* Do to the insanities of de_thread it is possible for a process
1756 * to have the pid of the thread group leader without actually being
1757 * the thread group leader. For iteration through the pids in proc
1758 * all we care about is that we have a task with the appropriate
1759 * pid, we don't actually care if we have the right task.
1761 static inline int has_group_leader_pid(struct task_struct *p)
1763 return p->pid == p->tgid;
1767 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1769 return p1->tgid == p2->tgid;
1772 static inline struct task_struct *next_thread(const struct task_struct *p)
1774 return list_entry(rcu_dereference(p->thread_group.next),
1775 struct task_struct, thread_group);
1778 static inline int thread_group_empty(struct task_struct *p)
1780 return list_empty(&p->thread_group);
1783 #define delay_group_leader(p) \
1784 (thread_group_leader(p) && !thread_group_empty(p))
1787 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1788 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1789 * pins the final release of task.io_context. Also protects ->cpuset and
1790 * ->cgroup.subsys[].
1792 * Nests both inside and outside of read_lock(&tasklist_lock).
1793 * It must not be nested with write_lock_irq(&tasklist_lock),
1794 * neither inside nor outside.
1796 static inline void task_lock(struct task_struct *p)
1798 spin_lock(&p->alloc_lock);
1801 static inline void task_unlock(struct task_struct *p)
1803 spin_unlock(&p->alloc_lock);
1806 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1807 unsigned long *flags);
1809 static inline void unlock_task_sighand(struct task_struct *tsk,
1810 unsigned long *flags)
1812 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1815 #ifndef __HAVE_THREAD_FUNCTIONS
1817 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
1818 #define task_stack_page(task) ((task)->stack)
1820 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1822 *task_thread_info(p) = *task_thread_info(org);
1823 task_thread_info(p)->task = p;
1826 static inline unsigned long *end_of_stack(struct task_struct *p)
1828 return (unsigned long *)(task_thread_info(p) + 1);
1833 /* set thread flags in other task's structures
1834 * - see asm/thread_info.h for TIF_xxxx flags available
1836 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1838 set_ti_thread_flag(task_thread_info(tsk), flag);
1841 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1843 clear_ti_thread_flag(task_thread_info(tsk), flag);
1846 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1848 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1851 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1853 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1856 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1858 return test_ti_thread_flag(task_thread_info(tsk), flag);
1861 static inline void set_tsk_need_resched(struct task_struct *tsk)
1863 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1866 static inline void clear_tsk_need_resched(struct task_struct *tsk)
1868 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1871 static inline int signal_pending(struct task_struct *p)
1873 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1876 static inline int need_resched(void)
1878 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1882 * cond_resched() and cond_resched_lock(): latency reduction via
1883 * explicit rescheduling in places that are safe. The return
1884 * value indicates whether a reschedule was done in fact.
1885 * cond_resched_lock() will drop the spinlock before scheduling,
1886 * cond_resched_softirq() will enable bhs before scheduling.
1888 #ifdef CONFIG_PREEMPT
1889 static inline int cond_resched(void)
1894 extern int _cond_resched(void);
1895 static inline int cond_resched(void)
1897 return _cond_resched();
1900 extern int cond_resched_lock(spinlock_t * lock);
1901 extern int cond_resched_softirq(void);
1904 * Does a critical section need to be broken due to another
1907 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1908 # define need_lockbreak(lock) ((lock)->break_lock)
1910 # define need_lockbreak(lock) 0
1914 * Does a critical section need to be broken due to another
1915 * task waiting or preemption being signalled:
1917 static inline int lock_need_resched(spinlock_t *lock)
1919 if (need_lockbreak(lock) || need_resched())
1925 * Reevaluate whether the task has signals pending delivery.
1926 * Wake the task if so.
1927 * This is required every time the blocked sigset_t changes.
1928 * callers must hold sighand->siglock.
1930 extern void recalc_sigpending_and_wake(struct task_struct *t);
1931 extern void recalc_sigpending(void);
1933 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1936 * Wrappers for p->thread_info->cpu access. No-op on UP.
1940 static inline unsigned int task_cpu(const struct task_struct *p)
1942 return task_thread_info(p)->cpu;
1945 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
1949 static inline unsigned int task_cpu(const struct task_struct *p)
1954 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1958 #endif /* CONFIG_SMP */
1960 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1961 extern void arch_pick_mmap_layout(struct mm_struct *mm);
1963 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1965 mm->mmap_base = TASK_UNMAPPED_BASE;
1966 mm->get_unmapped_area = arch_get_unmapped_area;
1967 mm->unmap_area = arch_unmap_area;
1971 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1972 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1974 extern int sched_mc_power_savings, sched_smt_power_savings;
1976 extern void normalize_rt_tasks(void);
1978 #ifdef CONFIG_FAIR_GROUP_SCHED
1980 extern struct task_group init_task_group;
1982 extern struct task_group *sched_create_group(void);
1983 extern void sched_destroy_group(struct task_group *tg);
1984 extern void sched_move_task(struct task_struct *tsk);
1985 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
1986 extern unsigned long sched_group_shares(struct task_group *tg);
1990 #ifdef CONFIG_TASK_XACCT
1991 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
1996 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2001 static inline void inc_syscr(struct task_struct *tsk)
2006 static inline void inc_syscw(struct task_struct *tsk)
2011 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2015 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2019 static inline void inc_syscr(struct task_struct *tsk)
2023 static inline void inc_syscw(struct task_struct *tsk)
2029 void migration_init(void);
2031 static inline void migration_init(void)
2036 #endif /* __KERNEL__ */