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 update_process_times(int user);
258 extern void scheduler_tick(void);
260 #ifdef CONFIG_DETECT_SOFTLOCKUP
261 extern void softlockup_tick(void);
262 extern void spawn_softlockup_task(void);
263 extern void touch_softlockup_watchdog(void);
264 extern void touch_all_softlockup_watchdogs(void);
265 extern int softlockup_thresh;
267 static inline void softlockup_tick(void)
270 static inline void spawn_softlockup_task(void)
273 static inline void touch_softlockup_watchdog(void)
276 static inline void touch_all_softlockup_watchdogs(void)
282 /* Attach to any functions which should be ignored in wchan output. */
283 #define __sched __attribute__((__section__(".sched.text")))
284 /* Is this address in the __sched functions? */
285 extern int in_sched_functions(unsigned long addr);
287 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
288 extern signed long FASTCALL(schedule_timeout(signed long timeout));
289 extern signed long schedule_timeout_interruptible(signed long timeout);
290 extern signed long schedule_timeout_uninterruptible(signed long timeout);
291 asmlinkage void schedule(void);
294 struct user_namespace;
296 /* Maximum number of active map areas.. This is a random (large) number */
297 #define DEFAULT_MAX_MAP_COUNT 65536
299 extern int sysctl_max_map_count;
301 #include <linux/aio.h>
304 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
305 unsigned long, unsigned long);
307 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
308 unsigned long len, unsigned long pgoff,
309 unsigned long flags);
310 extern void arch_unmap_area(struct mm_struct *, unsigned long);
311 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
313 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
315 * The mm counters are not protected by its page_table_lock,
316 * so must be incremented atomically.
318 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
319 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
320 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
321 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
322 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
324 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
326 * The mm counters are protected by its page_table_lock,
327 * so can be incremented directly.
329 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
330 #define get_mm_counter(mm, member) ((mm)->_##member)
331 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
332 #define inc_mm_counter(mm, member) (mm)->_##member++
333 #define dec_mm_counter(mm, member) (mm)->_##member--
335 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
337 #define get_mm_rss(mm) \
338 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
339 #define update_hiwater_rss(mm) do { \
340 unsigned long _rss = get_mm_rss(mm); \
341 if ((mm)->hiwater_rss < _rss) \
342 (mm)->hiwater_rss = _rss; \
344 #define update_hiwater_vm(mm) do { \
345 if ((mm)->hiwater_vm < (mm)->total_vm) \
346 (mm)->hiwater_vm = (mm)->total_vm; \
349 extern void set_dumpable(struct mm_struct *mm, int value);
350 extern int get_dumpable(struct mm_struct *mm);
354 #define MMF_DUMPABLE 0 /* core dump is permitted */
355 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
356 #define MMF_DUMPABLE_BITS 2
358 /* coredump filter bits */
359 #define MMF_DUMP_ANON_PRIVATE 2
360 #define MMF_DUMP_ANON_SHARED 3
361 #define MMF_DUMP_MAPPED_PRIVATE 4
362 #define MMF_DUMP_MAPPED_SHARED 5
363 #define MMF_DUMP_ELF_HEADERS 6
364 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
365 #define MMF_DUMP_FILTER_BITS 5
366 #define MMF_DUMP_FILTER_MASK \
367 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
368 #define MMF_DUMP_FILTER_DEFAULT \
369 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
371 struct sighand_struct {
373 struct k_sigaction action[_NSIG];
375 wait_queue_head_t signalfd_wqh;
378 struct pacct_struct {
381 unsigned long ac_mem;
382 cputime_t ac_utime, ac_stime;
383 unsigned long ac_minflt, ac_majflt;
387 * NOTE! "signal_struct" does not have it's own
388 * locking, because a shared signal_struct always
389 * implies a shared sighand_struct, so locking
390 * sighand_struct is always a proper superset of
391 * the locking of signal_struct.
393 struct signal_struct {
397 wait_queue_head_t wait_chldexit; /* for wait4() */
399 /* current thread group signal load-balancing target: */
400 struct task_struct *curr_target;
402 /* shared signal handling: */
403 struct sigpending shared_pending;
405 /* thread group exit support */
408 * - notify group_exit_task when ->count is equal to notify_count
409 * - everyone except group_exit_task is stopped during signal delivery
410 * of fatal signals, group_exit_task processes the signal.
412 struct task_struct *group_exit_task;
415 /* thread group stop support, overloads group_exit_code too */
416 int group_stop_count;
417 unsigned int flags; /* see SIGNAL_* flags below */
419 /* POSIX.1b Interval Timers */
420 struct list_head posix_timers;
422 /* ITIMER_REAL timer for the process */
423 struct hrtimer real_timer;
424 struct task_struct *tsk;
425 ktime_t it_real_incr;
427 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
428 cputime_t it_prof_expires, it_virt_expires;
429 cputime_t it_prof_incr, it_virt_incr;
431 /* job control IDs */
433 struct pid *tty_old_pgrp;
436 pid_t session __deprecated;
440 /* boolean value for session group leader */
443 struct tty_struct *tty; /* NULL if no tty */
446 * Cumulative resource counters for dead threads in the group,
447 * and for reaped dead child processes forked by this group.
448 * Live threads maintain their own counters and add to these
449 * in __exit_signal, except for the group leader.
451 cputime_t utime, stime, cutime, cstime;
454 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
455 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
456 unsigned long inblock, oublock, cinblock, coublock;
459 * Cumulative ns of scheduled CPU time for dead threads in the
460 * group, not including a zombie group leader. (This only differs
461 * from jiffies_to_ns(utime + stime) if sched_clock uses something
462 * other than jiffies.)
464 unsigned long long sum_sched_runtime;
467 * We don't bother to synchronize most readers of this at all,
468 * because there is no reader checking a limit that actually needs
469 * to get both rlim_cur and rlim_max atomically, and either one
470 * alone is a single word that can safely be read normally.
471 * getrlimit/setrlimit use task_lock(current->group_leader) to
472 * protect this instead of the siglock, because they really
473 * have no need to disable irqs.
475 struct rlimit rlim[RLIM_NLIMITS];
477 struct list_head cpu_timers[3];
479 /* keep the process-shared keyrings here so that they do the right
480 * thing in threads created with CLONE_THREAD */
482 struct key *session_keyring; /* keyring inherited over fork */
483 struct key *process_keyring; /* keyring private to this process */
485 #ifdef CONFIG_BSD_PROCESS_ACCT
486 struct pacct_struct pacct; /* per-process accounting information */
488 #ifdef CONFIG_TASKSTATS
489 struct taskstats *stats;
493 struct tty_audit_buf *tty_audit_buf;
497 /* Context switch must be unlocked if interrupts are to be enabled */
498 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
499 # define __ARCH_WANT_UNLOCKED_CTXSW
503 * Bits in flags field of signal_struct.
505 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
506 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
507 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
508 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
511 * Some day this will be a full-fledged user tracking system..
514 atomic_t __count; /* reference count */
515 atomic_t processes; /* How many processes does this user have? */
516 atomic_t files; /* How many open files does this user have? */
517 atomic_t sigpending; /* How many pending signals does this user have? */
518 #ifdef CONFIG_INOTIFY_USER
519 atomic_t inotify_watches; /* How many inotify watches does this user have? */
520 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
522 #ifdef CONFIG_POSIX_MQUEUE
523 /* protected by mq_lock */
524 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
526 unsigned long locked_shm; /* How many pages of mlocked shm ? */
529 struct key *uid_keyring; /* UID specific keyring */
530 struct key *session_keyring; /* UID's default session keyring */
533 /* Hash table maintenance information */
534 struct hlist_node uidhash_node;
537 #ifdef CONFIG_FAIR_USER_SCHED
538 struct task_group *tg;
541 struct subsys_attribute user_attr;
542 struct work_struct work;
547 #ifdef CONFIG_FAIR_USER_SCHED
548 extern int uids_kobject_init(void);
550 static inline int uids_kobject_init(void) { return 0; }
553 extern struct user_struct *find_user(uid_t);
555 extern struct user_struct root_user;
556 #define INIT_USER (&root_user)
558 struct backing_dev_info;
559 struct reclaim_state;
561 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
563 /* cumulative counters */
564 unsigned long pcount; /* # of times run on this cpu */
565 unsigned long long cpu_time, /* time spent on the cpu */
566 run_delay; /* time spent waiting on a runqueue */
569 unsigned long long last_arrival,/* when we last ran on a cpu */
570 last_queued; /* when we were last queued to run */
571 #ifdef CONFIG_SCHEDSTATS
573 unsigned int bkl_count;
576 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
578 #ifdef CONFIG_SCHEDSTATS
579 extern const struct file_operations proc_schedstat_operations;
580 #endif /* CONFIG_SCHEDSTATS */
582 #ifdef CONFIG_TASK_DELAY_ACCT
583 struct task_delay_info {
585 unsigned int flags; /* Private per-task flags */
587 /* For each stat XXX, add following, aligned appropriately
589 * struct timespec XXX_start, XXX_end;
593 * Atomicity of updates to XXX_delay, XXX_count protected by
594 * single lock above (split into XXX_lock if contention is an issue).
598 * XXX_count is incremented on every XXX operation, the delay
599 * associated with the operation is added to XXX_delay.
600 * XXX_delay contains the accumulated delay time in nanoseconds.
602 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
603 u64 blkio_delay; /* wait for sync block io completion */
604 u64 swapin_delay; /* wait for swapin block io completion */
605 u32 blkio_count; /* total count of the number of sync block */
606 /* io operations performed */
607 u32 swapin_count; /* total count of the number of swapin block */
608 /* io operations performed */
610 #endif /* CONFIG_TASK_DELAY_ACCT */
612 static inline int sched_info_on(void)
614 #ifdef CONFIG_SCHEDSTATS
616 #elif defined(CONFIG_TASK_DELAY_ACCT)
617 extern int delayacct_on;
632 * sched-domains (multiprocessor balancing) declarations:
636 * Increase resolution of nice-level calculations:
638 #define SCHED_LOAD_SHIFT 10
639 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
641 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
644 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
645 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
646 #define SD_BALANCE_EXEC 4 /* Balance on exec */
647 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
648 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
649 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
650 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
651 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
652 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
653 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
654 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
656 #define BALANCE_FOR_MC_POWER \
657 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
659 #define BALANCE_FOR_PKG_POWER \
660 ((sched_mc_power_savings || sched_smt_power_savings) ? \
661 SD_POWERSAVINGS_BALANCE : 0)
663 #define test_sd_parent(sd, flag) ((sd->parent && \
664 (sd->parent->flags & flag)) ? 1 : 0)
668 struct sched_group *next; /* Must be a circular list */
672 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
673 * single CPU. This is read only (except for setup, hotplug CPU).
674 * Note : Never change cpu_power without recompute its reciprocal
676 unsigned int __cpu_power;
678 * reciprocal value of cpu_power to avoid expensive divides
679 * (see include/linux/reciprocal_div.h)
681 u32 reciprocal_cpu_power;
684 struct sched_domain {
685 /* These fields must be setup */
686 struct sched_domain *parent; /* top domain must be null terminated */
687 struct sched_domain *child; /* bottom domain must be null terminated */
688 struct sched_group *groups; /* the balancing groups of the domain */
689 cpumask_t span; /* span of all CPUs in this domain */
690 unsigned long min_interval; /* Minimum balance interval ms */
691 unsigned long max_interval; /* Maximum balance interval ms */
692 unsigned int busy_factor; /* less balancing by factor if busy */
693 unsigned int imbalance_pct; /* No balance until over watermark */
694 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
695 unsigned int busy_idx;
696 unsigned int idle_idx;
697 unsigned int newidle_idx;
698 unsigned int wake_idx;
699 unsigned int forkexec_idx;
700 int flags; /* See SD_* */
702 /* Runtime fields. */
703 unsigned long last_balance; /* init to jiffies. units in jiffies */
704 unsigned int balance_interval; /* initialise to 1. units in ms. */
705 unsigned int nr_balance_failed; /* initialise to 0 */
707 #ifdef CONFIG_SCHEDSTATS
708 /* load_balance() stats */
709 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
710 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
711 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
712 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
713 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
714 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
715 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
716 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
718 /* Active load balancing */
719 unsigned int alb_count;
720 unsigned int alb_failed;
721 unsigned int alb_pushed;
723 /* SD_BALANCE_EXEC stats */
724 unsigned int sbe_count;
725 unsigned int sbe_balanced;
726 unsigned int sbe_pushed;
728 /* SD_BALANCE_FORK stats */
729 unsigned int sbf_count;
730 unsigned int sbf_balanced;
731 unsigned int sbf_pushed;
733 /* try_to_wake_up() stats */
734 unsigned int ttwu_wake_remote;
735 unsigned int ttwu_move_affine;
736 unsigned int ttwu_move_balance;
740 extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new);
742 #endif /* CONFIG_SMP */
745 * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
746 * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
747 * task of nice 0 or enough lower priority tasks to bring up the
750 static inline int above_background_load(void)
754 for_each_online_cpu(cpu) {
755 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
761 struct io_context; /* See blkdev.h */
762 #define NGROUPS_SMALL 32
763 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
767 gid_t small_block[NGROUPS_SMALL];
773 * get_group_info() must be called with the owning task locked (via task_lock())
774 * when task != current. The reason being that the vast majority of callers are
775 * looking at current->group_info, which can not be changed except by the
776 * current task. Changing current->group_info requires the task lock, too.
778 #define get_group_info(group_info) do { \
779 atomic_inc(&(group_info)->usage); \
782 #define put_group_info(group_info) do { \
783 if (atomic_dec_and_test(&(group_info)->usage)) \
784 groups_free(group_info); \
787 extern struct group_info *groups_alloc(int gidsetsize);
788 extern void groups_free(struct group_info *group_info);
789 extern int set_current_groups(struct group_info *group_info);
790 extern int groups_search(struct group_info *group_info, gid_t grp);
791 /* access the groups "array" with this macro */
792 #define GROUP_AT(gi, i) \
793 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
795 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
796 extern void prefetch_stack(struct task_struct *t);
798 static inline void prefetch_stack(struct task_struct *t) { }
801 struct audit_context; /* See audit.c */
803 struct pipe_inode_info;
804 struct uts_namespace;
810 const struct sched_class *next;
812 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
813 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
814 void (*yield_task) (struct rq *rq);
816 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
818 struct task_struct * (*pick_next_task) (struct rq *rq);
819 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
821 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
823 unsigned long max_nr_move, unsigned long max_load_move,
824 struct sched_domain *sd, enum cpu_idle_type idle,
825 int *all_pinned, int *this_best_prio);
827 void (*set_curr_task) (struct rq *rq);
828 void (*task_tick) (struct rq *rq, struct task_struct *p);
829 void (*task_new) (struct rq *rq, struct task_struct *p);
833 unsigned long weight, inv_weight;
837 * CFS stats for a schedulable entity (task, task-group etc)
839 * Current field usage histogram:
846 struct sched_entity {
847 struct load_weight load; /* for load-balancing */
848 struct rb_node run_node;
853 u64 sum_exec_runtime;
855 u64 prev_sum_exec_runtime;
857 #ifdef CONFIG_SCHEDSTATS
863 s64 sum_sleep_runtime;
871 u64 nr_migrations_cold;
872 u64 nr_failed_migrations_affine;
873 u64 nr_failed_migrations_running;
874 u64 nr_failed_migrations_hot;
875 u64 nr_forced_migrations;
876 u64 nr_forced2_migrations;
880 u64 nr_wakeups_migrate;
881 u64 nr_wakeups_local;
882 u64 nr_wakeups_remote;
883 u64 nr_wakeups_affine;
884 u64 nr_wakeups_affine_attempts;
885 u64 nr_wakeups_passive;
889 #ifdef CONFIG_FAIR_GROUP_SCHED
890 struct sched_entity *parent;
891 /* rq on which this entity is (to be) queued: */
892 struct cfs_rq *cfs_rq;
893 /* rq "owned" by this entity/group: */
899 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
902 unsigned int flags; /* per process flags, defined below */
905 int lock_depth; /* BKL lock depth */
908 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
913 int prio, static_prio, normal_prio;
914 struct list_head run_list;
915 const struct sched_class *sched_class;
916 struct sched_entity se;
918 #ifdef CONFIG_PREEMPT_NOTIFIERS
919 /* list of struct preempt_notifier: */
920 struct hlist_head preempt_notifiers;
923 unsigned short ioprio;
925 * fpu_counter contains the number of consecutive context switches
926 * that the FPU is used. If this is over a threshold, the lazy fpu
927 * saving becomes unlazy to save the trap. This is an unsigned char
928 * so that after 256 times the counter wraps and the behavior turns
929 * lazy again; this to deal with bursty apps that only use FPU for
932 unsigned char fpu_counter;
933 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
934 #ifdef CONFIG_BLK_DEV_IO_TRACE
935 unsigned int btrace_seq;
939 cpumask_t cpus_allowed;
940 unsigned int time_slice;
942 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
943 struct sched_info sched_info;
946 struct list_head tasks;
948 * ptrace_list/ptrace_children forms the list of my children
949 * that were stolen by a ptracer.
951 struct list_head ptrace_children;
952 struct list_head ptrace_list;
954 struct mm_struct *mm, *active_mm;
957 struct linux_binfmt *binfmt;
959 int exit_code, exit_signal;
960 int pdeath_signal; /* The signal sent when the parent dies */
962 unsigned int personality;
967 #ifdef CONFIG_CC_STACKPROTECTOR
968 /* Canary value for the -fstack-protector gcc feature */
969 unsigned long stack_canary;
972 * pointers to (original) parent process, youngest child, younger sibling,
973 * older sibling, respectively. (p->father can be replaced with
976 struct task_struct *real_parent; /* real parent process (when being debugged) */
977 struct task_struct *parent; /* parent process */
979 * children/sibling forms the list of my children plus the
980 * tasks I'm ptracing.
982 struct list_head children; /* list of my children */
983 struct list_head sibling; /* linkage in my parent's children list */
984 struct task_struct *group_leader; /* threadgroup leader */
986 /* PID/PID hash table linkage. */
987 struct pid_link pids[PIDTYPE_MAX];
988 struct list_head thread_group;
990 struct completion *vfork_done; /* for vfork() */
991 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
992 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
994 unsigned int rt_priority;
995 cputime_t utime, stime, utimescaled, stimescaled;
997 unsigned long nvcsw, nivcsw; /* context switch counts */
998 struct timespec start_time; /* monotonic time */
999 struct timespec real_start_time; /* boot based time */
1000 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1001 unsigned long min_flt, maj_flt;
1003 cputime_t it_prof_expires, it_virt_expires;
1004 unsigned long long it_sched_expires;
1005 struct list_head cpu_timers[3];
1007 /* process credentials */
1008 uid_t uid,euid,suid,fsuid;
1009 gid_t gid,egid,sgid,fsgid;
1010 struct group_info *group_info;
1011 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
1012 unsigned keep_capabilities:1;
1013 struct user_struct *user;
1015 struct key *request_key_auth; /* assumed request_key authority */
1016 struct key *thread_keyring; /* keyring private to this thread */
1017 unsigned char jit_keyring; /* default keyring to attach requested keys to */
1019 char comm[TASK_COMM_LEN]; /* executable name excluding path
1020 - access with [gs]et_task_comm (which lock
1021 it with task_lock())
1022 - initialized normally by flush_old_exec */
1023 /* file system info */
1024 int link_count, total_link_count;
1025 #ifdef CONFIG_SYSVIPC
1027 struct sysv_sem sysvsem;
1029 /* CPU-specific state of this task */
1030 struct thread_struct thread;
1031 /* filesystem information */
1032 struct fs_struct *fs;
1033 /* open file information */
1034 struct files_struct *files;
1036 struct nsproxy *nsproxy;
1037 /* signal handlers */
1038 struct signal_struct *signal;
1039 struct sighand_struct *sighand;
1041 sigset_t blocked, real_blocked;
1042 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */
1043 struct sigpending pending;
1045 unsigned long sas_ss_sp;
1047 int (*notifier)(void *priv);
1048 void *notifier_data;
1049 sigset_t *notifier_mask;
1050 #ifdef CONFIG_SECURITY
1053 struct audit_context *audit_context;
1056 /* Thread group tracking */
1059 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1060 spinlock_t alloc_lock;
1062 /* Protection of the PI data structures: */
1065 #ifdef CONFIG_RT_MUTEXES
1066 /* PI waiters blocked on a rt_mutex held by this task */
1067 struct plist_head pi_waiters;
1068 /* Deadlock detection and priority inheritance handling */
1069 struct rt_mutex_waiter *pi_blocked_on;
1072 #ifdef CONFIG_DEBUG_MUTEXES
1073 /* mutex deadlock detection */
1074 struct mutex_waiter *blocked_on;
1076 #ifdef CONFIG_TRACE_IRQFLAGS
1077 unsigned int irq_events;
1078 int hardirqs_enabled;
1079 unsigned long hardirq_enable_ip;
1080 unsigned int hardirq_enable_event;
1081 unsigned long hardirq_disable_ip;
1082 unsigned int hardirq_disable_event;
1083 int softirqs_enabled;
1084 unsigned long softirq_disable_ip;
1085 unsigned int softirq_disable_event;
1086 unsigned long softirq_enable_ip;
1087 unsigned int softirq_enable_event;
1088 int hardirq_context;
1089 int softirq_context;
1091 #ifdef CONFIG_LOCKDEP
1092 # define MAX_LOCK_DEPTH 30UL
1095 struct held_lock held_locks[MAX_LOCK_DEPTH];
1096 unsigned int lockdep_recursion;
1099 /* journalling filesystem info */
1102 /* stacked block device info */
1103 struct bio *bio_list, **bio_tail;
1106 struct reclaim_state *reclaim_state;
1108 struct backing_dev_info *backing_dev_info;
1110 struct io_context *io_context;
1112 unsigned long ptrace_message;
1113 siginfo_t *last_siginfo; /* For ptrace use. */
1114 #ifdef CONFIG_TASK_XACCT
1115 /* i/o counters(bytes read/written, #syscalls */
1116 u64 rchar, wchar, syscr, syscw;
1118 struct task_io_accounting ioac;
1119 #if defined(CONFIG_TASK_XACCT)
1120 u64 acct_rss_mem1; /* accumulated rss usage */
1121 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1122 cputime_t acct_stimexpd;/* stime since last update */
1125 struct mempolicy *mempolicy;
1128 #ifdef CONFIG_CPUSETS
1129 nodemask_t mems_allowed;
1130 int cpuset_mems_generation;
1131 int cpuset_mem_spread_rotor;
1133 #ifdef CONFIG_CGROUPS
1134 /* Control Group info protected by css_set_lock */
1135 struct css_set *cgroups;
1136 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1137 struct list_head cg_list;
1140 struct robust_list_head __user *robust_list;
1141 #ifdef CONFIG_COMPAT
1142 struct compat_robust_list_head __user *compat_robust_list;
1144 struct list_head pi_state_list;
1145 struct futex_pi_state *pi_state_cache;
1147 atomic_t fs_excl; /* holding fs exclusive resources */
1148 struct rcu_head rcu;
1151 * cache last used pipe for splice
1153 struct pipe_inode_info *splice_pipe;
1154 #ifdef CONFIG_TASK_DELAY_ACCT
1155 struct task_delay_info *delays;
1157 #ifdef CONFIG_FAULT_INJECTION
1160 struct prop_local_single dirties;
1164 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1165 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1166 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1167 * values are inverted: lower p->prio value means higher priority.
1169 * The MAX_USER_RT_PRIO value allows the actual maximum
1170 * RT priority to be separate from the value exported to
1171 * user-space. This allows kernel threads to set their
1172 * priority to a value higher than any user task. Note:
1173 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1176 #define MAX_USER_RT_PRIO 100
1177 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1179 #define MAX_PRIO (MAX_RT_PRIO + 40)
1180 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1182 static inline int rt_prio(int prio)
1184 if (unlikely(prio < MAX_RT_PRIO))
1189 static inline int rt_task(struct task_struct *p)
1191 return rt_prio(p->prio);
1194 static inline void set_task_session(struct task_struct *tsk, pid_t session)
1196 tsk->signal->__session = session;
1199 static inline struct pid *task_pid(struct task_struct *task)
1201 return task->pids[PIDTYPE_PID].pid;
1204 static inline struct pid *task_tgid(struct task_struct *task)
1206 return task->group_leader->pids[PIDTYPE_PID].pid;
1209 static inline struct pid *task_pgrp(struct task_struct *task)
1211 return task->group_leader->pids[PIDTYPE_PGID].pid;
1214 static inline struct pid *task_session(struct task_struct *task)
1216 return task->group_leader->pids[PIDTYPE_SID].pid;
1219 struct pid_namespace;
1222 * the helpers to get the task's different pids as they are seen
1223 * from various namespaces
1225 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1226 * task_xid_vnr() : virtual id, i.e. the id seen from the namespace the task
1227 * belongs to. this only makes sence when called in the
1228 * context of the task that belongs to the same namespace;
1229 * task_xid_nr_ns() : id seen from the ns specified;
1231 * set_task_vxid() : assigns a virtual id to a task;
1233 * task_ppid_nr_ns() : the parent's id as seen from the namespace specified.
1234 * the result depends on the namespace and whether the
1235 * task in question is the namespace's init. e.g. for the
1236 * namespace's init this will return 0 when called from
1237 * the namespace of this init, or appropriate id otherwise.
1240 * see also pid_nr() etc in include/linux/pid.h
1243 static inline pid_t task_pid_nr(struct task_struct *tsk)
1248 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1250 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1252 return pid_vnr(task_pid(tsk));
1256 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1261 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1263 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1265 return pid_vnr(task_tgid(tsk));
1269 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1271 return tsk->signal->pgrp;
1274 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1276 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1278 return pid_vnr(task_pgrp(tsk));
1282 static inline pid_t task_session_nr(struct task_struct *tsk)
1284 return tsk->signal->__session;
1287 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1289 static inline pid_t task_session_vnr(struct task_struct *tsk)
1291 return pid_vnr(task_session(tsk));
1295 static inline pid_t task_ppid_nr_ns(struct task_struct *tsk,
1296 struct pid_namespace *ns)
1298 return pid_nr_ns(task_pid(rcu_dereference(tsk->real_parent)), ns);
1302 * pid_alive - check that a task structure is not stale
1303 * @p: Task structure to be checked.
1305 * Test if a process is not yet dead (at most zombie state)
1306 * If pid_alive fails, then pointers within the task structure
1307 * can be stale and must not be dereferenced.
1309 static inline int pid_alive(struct task_struct *p)
1311 return p->pids[PIDTYPE_PID].pid != NULL;
1315 * is_global_init - check if a task structure is init
1316 * @tsk: Task structure to be checked.
1318 * Check if a task structure is the first user space task the kernel created.
1320 static inline int is_global_init(struct task_struct *tsk)
1322 return tsk->pid == 1;
1326 * is_container_init:
1327 * check whether in the task is init in its own pid namespace.
1329 extern int is_container_init(struct task_struct *tsk);
1331 extern struct pid *cad_pid;
1333 extern void free_task(struct task_struct *tsk);
1334 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1336 extern void __put_task_struct(struct task_struct *t);
1338 static inline void put_task_struct(struct task_struct *t)
1340 if (atomic_dec_and_test(&t->usage))
1341 __put_task_struct(t);
1347 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1348 /* Not implemented yet, only for 486*/
1349 #define PF_STARTING 0x00000002 /* being created */
1350 #define PF_EXITING 0x00000004 /* getting shut down */
1351 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1352 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1353 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1354 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1355 #define PF_DUMPCORE 0x00000200 /* dumped core */
1356 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1357 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1358 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1359 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1360 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1361 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1362 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1363 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1364 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1365 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1366 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1367 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1368 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1369 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1370 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1371 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1372 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1373 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1376 * Only the _current_ task can read/write to tsk->flags, but other
1377 * tasks can access tsk->flags in readonly mode for example
1378 * with tsk_used_math (like during threaded core dumping).
1379 * There is however an exception to this rule during ptrace
1380 * or during fork: the ptracer task is allowed to write to the
1381 * child->flags of its traced child (same goes for fork, the parent
1382 * can write to the child->flags), because we're guaranteed the
1383 * child is not running and in turn not changing child->flags
1384 * at the same time the parent does it.
1386 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1387 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1388 #define clear_used_math() clear_stopped_child_used_math(current)
1389 #define set_used_math() set_stopped_child_used_math(current)
1390 #define conditional_stopped_child_used_math(condition, child) \
1391 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1392 #define conditional_used_math(condition) \
1393 conditional_stopped_child_used_math(condition, current)
1394 #define copy_to_stopped_child_used_math(child) \
1395 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1396 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1397 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1398 #define used_math() tsk_used_math(current)
1401 extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask);
1403 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1405 if (!cpu_isset(0, new_mask))
1411 extern unsigned long long sched_clock(void);
1414 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1415 * clock constructed from sched_clock():
1417 extern unsigned long long cpu_clock(int cpu);
1419 extern unsigned long long
1420 task_sched_runtime(struct task_struct *task);
1422 /* sched_exec is called by processes performing an exec */
1424 extern void sched_exec(void);
1426 #define sched_exec() {}
1429 extern void sched_clock_idle_sleep_event(void);
1430 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1432 #ifdef CONFIG_HOTPLUG_CPU
1433 extern void idle_task_exit(void);
1435 static inline void idle_task_exit(void) {}
1438 extern void sched_idle_next(void);
1440 #ifdef CONFIG_SCHED_DEBUG
1441 extern unsigned int sysctl_sched_latency;
1442 extern unsigned int sysctl_sched_nr_latency;
1443 extern unsigned int sysctl_sched_wakeup_granularity;
1444 extern unsigned int sysctl_sched_batch_wakeup_granularity;
1445 extern unsigned int sysctl_sched_child_runs_first;
1446 extern unsigned int sysctl_sched_features;
1447 extern unsigned int sysctl_sched_migration_cost;
1450 extern unsigned int sysctl_sched_compat_yield;
1452 #ifdef CONFIG_RT_MUTEXES
1453 extern int rt_mutex_getprio(struct task_struct *p);
1454 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1455 extern void rt_mutex_adjust_pi(struct task_struct *p);
1457 static inline int rt_mutex_getprio(struct task_struct *p)
1459 return p->normal_prio;
1461 # define rt_mutex_adjust_pi(p) do { } while (0)
1464 extern void set_user_nice(struct task_struct *p, long nice);
1465 extern int task_prio(const struct task_struct *p);
1466 extern int task_nice(const struct task_struct *p);
1467 extern int can_nice(const struct task_struct *p, const int nice);
1468 extern int task_curr(const struct task_struct *p);
1469 extern int idle_cpu(int cpu);
1470 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1471 extern struct task_struct *idle_task(int cpu);
1472 extern struct task_struct *curr_task(int cpu);
1473 extern void set_curr_task(int cpu, struct task_struct *p);
1478 * The default (Linux) execution domain.
1480 extern struct exec_domain default_exec_domain;
1482 union thread_union {
1483 struct thread_info thread_info;
1484 unsigned long stack[THREAD_SIZE/sizeof(long)];
1487 #ifndef __HAVE_ARCH_KSTACK_END
1488 static inline int kstack_end(void *addr)
1490 /* Reliable end of stack detection:
1491 * Some APM bios versions misalign the stack
1493 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1497 extern union thread_union init_thread_union;
1498 extern struct task_struct init_task;
1500 extern struct mm_struct init_mm;
1502 extern struct pid_namespace init_pid_ns;
1505 * find a task by one of its numerical ids
1507 * find_task_by_pid_type_ns():
1508 * it is the most generic call - it finds a task by all id,
1509 * type and namespace specified
1510 * find_task_by_pid_ns():
1511 * finds a task by its pid in the specified namespace
1512 * find_task_by_vpid():
1513 * finds a task by its virtual pid
1514 * find_task_by_pid():
1515 * finds a task by its global pid
1517 * see also find_pid() etc in include/linux/pid.h
1520 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1521 struct pid_namespace *ns);
1523 extern struct task_struct *find_task_by_pid(pid_t nr);
1524 extern struct task_struct *find_task_by_vpid(pid_t nr);
1525 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1526 struct pid_namespace *ns);
1528 extern void __set_special_pids(pid_t session, pid_t pgrp);
1530 /* per-UID process charging. */
1531 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1532 static inline struct user_struct *get_uid(struct user_struct *u)
1534 atomic_inc(&u->__count);
1537 extern void free_uid(struct user_struct *);
1538 extern void switch_uid(struct user_struct *);
1539 extern void release_uids(struct user_namespace *ns);
1541 #include <asm/current.h>
1543 extern void do_timer(unsigned long ticks);
1545 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
1546 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
1547 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
1548 unsigned long clone_flags));
1550 extern void kick_process(struct task_struct *tsk);
1552 static inline void kick_process(struct task_struct *tsk) { }
1554 extern void sched_fork(struct task_struct *p, int clone_flags);
1555 extern void sched_dead(struct task_struct *p);
1557 extern int in_group_p(gid_t);
1558 extern int in_egroup_p(gid_t);
1560 extern void proc_caches_init(void);
1561 extern void flush_signals(struct task_struct *);
1562 extern void ignore_signals(struct task_struct *);
1563 extern void flush_signal_handlers(struct task_struct *, int force_default);
1564 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1566 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1568 unsigned long flags;
1571 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1572 ret = dequeue_signal(tsk, mask, info);
1573 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1578 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1580 extern void unblock_all_signals(void);
1581 extern void release_task(struct task_struct * p);
1582 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1583 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
1584 extern int force_sigsegv(int, struct task_struct *);
1585 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1586 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1587 extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1588 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1589 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1590 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1591 extern int kill_pid(struct pid *pid, int sig, int priv);
1592 extern int kill_proc_info(int, struct siginfo *, pid_t);
1593 extern void do_notify_parent(struct task_struct *, int);
1594 extern void force_sig(int, struct task_struct *);
1595 extern void force_sig_specific(int, struct task_struct *);
1596 extern int send_sig(int, struct task_struct *, int);
1597 extern void zap_other_threads(struct task_struct *p);
1598 extern int kill_proc(pid_t, int, int);
1599 extern struct sigqueue *sigqueue_alloc(void);
1600 extern void sigqueue_free(struct sigqueue *);
1601 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
1602 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
1603 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1604 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1606 static inline int kill_cad_pid(int sig, int priv)
1608 return kill_pid(cad_pid, sig, priv);
1611 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1612 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1613 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1614 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1616 static inline int is_si_special(const struct siginfo *info)
1618 return info <= SEND_SIG_FORCED;
1621 /* True if we are on the alternate signal stack. */
1623 static inline int on_sig_stack(unsigned long sp)
1625 return (sp - current->sas_ss_sp < current->sas_ss_size);
1628 static inline int sas_ss_flags(unsigned long sp)
1630 return (current->sas_ss_size == 0 ? SS_DISABLE
1631 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1635 * Routines for handling mm_structs
1637 extern struct mm_struct * mm_alloc(void);
1639 /* mmdrop drops the mm and the page tables */
1640 extern void FASTCALL(__mmdrop(struct mm_struct *));
1641 static inline void mmdrop(struct mm_struct * mm)
1643 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1647 /* mmput gets rid of the mappings and all user-space */
1648 extern void mmput(struct mm_struct *);
1649 /* Grab a reference to a task's mm, if it is not already going away */
1650 extern struct mm_struct *get_task_mm(struct task_struct *task);
1651 /* Remove the current tasks stale references to the old mm_struct */
1652 extern void mm_release(struct task_struct *, struct mm_struct *);
1654 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1655 extern void flush_thread(void);
1656 extern void exit_thread(void);
1658 extern void exit_files(struct task_struct *);
1659 extern void __cleanup_signal(struct signal_struct *);
1660 extern void __cleanup_sighand(struct sighand_struct *);
1661 extern void exit_itimers(struct signal_struct *);
1663 extern NORET_TYPE void do_group_exit(int);
1665 extern void daemonize(const char *, ...);
1666 extern int allow_signal(int);
1667 extern int disallow_signal(int);
1669 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1670 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1671 struct task_struct *fork_idle(int);
1673 extern void set_task_comm(struct task_struct *tsk, char *from);
1674 extern void get_task_comm(char *to, struct task_struct *tsk);
1677 extern void wait_task_inactive(struct task_struct * p);
1679 #define wait_task_inactive(p) do { } while (0)
1682 #define remove_parent(p) list_del_init(&(p)->sibling)
1683 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1685 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1687 #define for_each_process(p) \
1688 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1691 * Careful: do_each_thread/while_each_thread is a double loop so
1692 * 'break' will not work as expected - use goto instead.
1694 #define do_each_thread(g, t) \
1695 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1697 #define while_each_thread(g, t) \
1698 while ((t = next_thread(t)) != g)
1700 /* de_thread depends on thread_group_leader not being a pid based check */
1701 #define thread_group_leader(p) (p == p->group_leader)
1703 /* Do to the insanities of de_thread it is possible for a process
1704 * to have the pid of the thread group leader without actually being
1705 * the thread group leader. For iteration through the pids in proc
1706 * all we care about is that we have a task with the appropriate
1707 * pid, we don't actually care if we have the right task.
1709 static inline int has_group_leader_pid(struct task_struct *p)
1711 return p->pid == p->tgid;
1715 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1717 return p1->tgid == p2->tgid;
1720 static inline struct task_struct *next_thread(const struct task_struct *p)
1722 return list_entry(rcu_dereference(p->thread_group.next),
1723 struct task_struct, thread_group);
1726 static inline int thread_group_empty(struct task_struct *p)
1728 return list_empty(&p->thread_group);
1731 #define delay_group_leader(p) \
1732 (thread_group_leader(p) && !thread_group_empty(p))
1735 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1736 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1737 * pins the final release of task.io_context. Also protects ->cpuset and
1738 * ->cgroup.subsys[].
1740 * Nests both inside and outside of read_lock(&tasklist_lock).
1741 * It must not be nested with write_lock_irq(&tasklist_lock),
1742 * neither inside nor outside.
1744 static inline void task_lock(struct task_struct *p)
1746 spin_lock(&p->alloc_lock);
1749 static inline void task_unlock(struct task_struct *p)
1751 spin_unlock(&p->alloc_lock);
1754 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1755 unsigned long *flags);
1757 static inline void unlock_task_sighand(struct task_struct *tsk,
1758 unsigned long *flags)
1760 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1763 #ifndef __HAVE_THREAD_FUNCTIONS
1765 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
1766 #define task_stack_page(task) ((task)->stack)
1768 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1770 *task_thread_info(p) = *task_thread_info(org);
1771 task_thread_info(p)->task = p;
1774 static inline unsigned long *end_of_stack(struct task_struct *p)
1776 return (unsigned long *)(task_thread_info(p) + 1);
1781 /* set thread flags in other task's structures
1782 * - see asm/thread_info.h for TIF_xxxx flags available
1784 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1786 set_ti_thread_flag(task_thread_info(tsk), flag);
1789 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1791 clear_ti_thread_flag(task_thread_info(tsk), flag);
1794 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1796 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1799 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1801 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1804 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1806 return test_ti_thread_flag(task_thread_info(tsk), flag);
1809 static inline void set_tsk_need_resched(struct task_struct *tsk)
1811 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1814 static inline void clear_tsk_need_resched(struct task_struct *tsk)
1816 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1819 static inline int signal_pending(struct task_struct *p)
1821 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1824 static inline int need_resched(void)
1826 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1830 * cond_resched() and cond_resched_lock(): latency reduction via
1831 * explicit rescheduling in places that are safe. The return
1832 * value indicates whether a reschedule was done in fact.
1833 * cond_resched_lock() will drop the spinlock before scheduling,
1834 * cond_resched_softirq() will enable bhs before scheduling.
1836 extern int cond_resched(void);
1837 extern int cond_resched_lock(spinlock_t * lock);
1838 extern int cond_resched_softirq(void);
1841 * Does a critical section need to be broken due to another
1844 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1845 # define need_lockbreak(lock) ((lock)->break_lock)
1847 # define need_lockbreak(lock) 0
1851 * Does a critical section need to be broken due to another
1852 * task waiting or preemption being signalled:
1854 static inline int lock_need_resched(spinlock_t *lock)
1856 if (need_lockbreak(lock) || need_resched())
1862 * Reevaluate whether the task has signals pending delivery.
1863 * Wake the task if so.
1864 * This is required every time the blocked sigset_t changes.
1865 * callers must hold sighand->siglock.
1867 extern void recalc_sigpending_and_wake(struct task_struct *t);
1868 extern void recalc_sigpending(void);
1870 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1873 * Wrappers for p->thread_info->cpu access. No-op on UP.
1877 static inline unsigned int task_cpu(const struct task_struct *p)
1879 return task_thread_info(p)->cpu;
1882 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
1886 static inline unsigned int task_cpu(const struct task_struct *p)
1891 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1895 #endif /* CONFIG_SMP */
1897 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1898 extern void arch_pick_mmap_layout(struct mm_struct *mm);
1900 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1902 mm->mmap_base = TASK_UNMAPPED_BASE;
1903 mm->get_unmapped_area = arch_get_unmapped_area;
1904 mm->unmap_area = arch_unmap_area;
1908 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1909 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1911 extern int sched_mc_power_savings, sched_smt_power_savings;
1913 extern void normalize_rt_tasks(void);
1915 #ifdef CONFIG_FAIR_GROUP_SCHED
1917 extern struct task_group init_task_group;
1919 extern struct task_group *sched_create_group(void);
1920 extern void sched_destroy_group(struct task_group *tg);
1921 extern void sched_move_task(struct task_struct *tsk);
1922 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
1923 extern unsigned long sched_group_shares(struct task_group *tg);
1927 #ifdef CONFIG_TASK_XACCT
1928 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
1933 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
1938 static inline void inc_syscr(struct task_struct *tsk)
1943 static inline void inc_syscw(struct task_struct *tsk)
1948 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
1952 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
1956 static inline void inc_syscr(struct task_struct *tsk)
1960 static inline void inc_syscw(struct task_struct *tsk)
1965 #endif /* __KERNEL__ */