7 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
8 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
9 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
10 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
11 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
12 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
13 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
14 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
15 #define CLONE_THREAD 0x00010000 /* Same thread group? */
16 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
17 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
18 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
19 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
20 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
21 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
22 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
23 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
24 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
25 #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
26 #define CLONE_NEWIPC 0x08000000 /* New ipcs */
27 #define CLONE_NEWUSER 0x10000000 /* New user namespace */
28 #define CLONE_NEWPID 0x20000000 /* New pid namespace */
29 #define CLONE_NEWNET 0x40000000 /* New network namespace */
30 #define CLONE_IO 0x80000000 /* Clone io context */
35 #define SCHED_NORMAL 0
39 /* SCHED_ISO: reserved but not implemented yet */
48 #include <asm/param.h> /* for HZ */
50 #include <linux/capability.h>
51 #include <linux/threads.h>
52 #include <linux/kernel.h>
53 #include <linux/types.h>
54 #include <linux/timex.h>
55 #include <linux/jiffies.h>
56 #include <linux/rbtree.h>
57 #include <linux/thread_info.h>
58 #include <linux/cpumask.h>
59 #include <linux/errno.h>
60 #include <linux/nodemask.h>
61 #include <linux/mm_types.h>
63 #include <asm/system.h>
65 #include <asm/ptrace.h>
66 #include <asm/cputime.h>
68 #include <linux/smp.h>
69 #include <linux/sem.h>
70 #include <linux/signal.h>
71 #include <linux/fs_struct.h>
72 #include <linux/compiler.h>
73 #include <linux/completion.h>
74 #include <linux/pid.h>
75 #include <linux/percpu.h>
76 #include <linux/topology.h>
77 #include <linux/proportions.h>
78 #include <linux/seccomp.h>
79 #include <linux/rcupdate.h>
80 #include <linux/rtmutex.h>
82 #include <linux/time.h>
83 #include <linux/param.h>
84 #include <linux/resource.h>
85 #include <linux/timer.h>
86 #include <linux/hrtimer.h>
87 #include <linux/task_io_accounting.h>
88 #include <linux/kobject.h>
89 #include <linux/latencytop.h>
90 #include <linux/cred.h>
92 #include <asm/processor.h>
96 struct futex_pi_state
;
97 struct robust_list_head
;
102 * List of flags we want to share for kernel threads,
103 * if only because they are not used by them anyway.
105 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
108 * These are the constant used to fake the fixed-point load-average
109 * counting. Some notes:
110 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
111 * a load-average precision of 10 bits integer + 11 bits fractional
112 * - if you want to count load-averages more often, you need more
113 * precision, or rounding will get you. With 2-second counting freq,
114 * the EXP_n values would be 1981, 2034 and 2043 if still using only
117 extern unsigned long avenrun
[]; /* Load averages */
119 #define FSHIFT 11 /* nr of bits of precision */
120 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
121 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
122 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
123 #define EXP_5 2014 /* 1/exp(5sec/5min) */
124 #define EXP_15 2037 /* 1/exp(5sec/15min) */
126 #define CALC_LOAD(load,exp,n) \
128 load += n*(FIXED_1-exp); \
131 extern unsigned long total_forks
;
132 extern int nr_threads
;
133 DECLARE_PER_CPU(unsigned long, process_counts
);
134 extern int nr_processes(void);
135 extern unsigned long nr_running(void);
136 extern unsigned long nr_uninterruptible(void);
137 extern unsigned long nr_active(void);
138 extern unsigned long nr_iowait(void);
143 #ifdef CONFIG_SCHED_DEBUG
144 extern void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
);
145 extern void proc_sched_set_task(struct task_struct
*p
);
147 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
);
150 proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
153 static inline void proc_sched_set_task(struct task_struct
*p
)
157 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
162 extern unsigned long long time_sync_thresh
;
165 * Task state bitmask. NOTE! These bits are also
166 * encoded in fs/proc/array.c: get_task_state().
168 * We have two separate sets of flags: task->state
169 * is about runnability, while task->exit_state are
170 * about the task exiting. Confusing, but this way
171 * modifying one set can't modify the other one by
174 #define TASK_RUNNING 0
175 #define TASK_INTERRUPTIBLE 1
176 #define TASK_UNINTERRUPTIBLE 2
177 #define __TASK_STOPPED 4
178 #define __TASK_TRACED 8
179 /* in tsk->exit_state */
180 #define EXIT_ZOMBIE 16
182 /* in tsk->state again */
184 #define TASK_WAKEKILL 128
186 /* Convenience macros for the sake of set_task_state */
187 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
188 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
189 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
191 /* Convenience macros for the sake of wake_up */
192 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
193 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
195 /* get_task_state() */
196 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
197 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
200 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
201 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
202 #define task_is_stopped_or_traced(task) \
203 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
204 #define task_contributes_to_load(task) \
205 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
207 #define __set_task_state(tsk, state_value) \
208 do { (tsk)->state = (state_value); } while (0)
209 #define set_task_state(tsk, state_value) \
210 set_mb((tsk)->state, (state_value))
213 * set_current_state() includes a barrier so that the write of current->state
214 * is correctly serialised wrt the caller's subsequent test of whether to
217 * set_current_state(TASK_UNINTERRUPTIBLE);
218 * if (do_i_need_to_sleep())
221 * If the caller does not need such serialisation then use __set_current_state()
223 #define __set_current_state(state_value) \
224 do { current->state = (state_value); } while (0)
225 #define set_current_state(state_value) \
226 set_mb(current->state, (state_value))
228 /* Task command name length */
229 #define TASK_COMM_LEN 16
231 #include <linux/spinlock.h>
234 * This serializes "schedule()" and also protects
235 * the run-queue from deletions/modifications (but
236 * _adding_ to the beginning of the run-queue has
239 extern rwlock_t tasklist_lock
;
240 extern spinlock_t mmlist_lock
;
244 extern void sched_init(void);
245 extern void sched_init_smp(void);
246 extern asmlinkage
void schedule_tail(struct task_struct
*prev
);
247 extern void init_idle(struct task_struct
*idle
, int cpu
);
248 extern void init_idle_bootup_task(struct task_struct
*idle
);
250 extern int runqueue_is_locked(void);
251 extern void task_rq_unlock_wait(struct task_struct
*p
);
253 extern cpumask_var_t nohz_cpu_mask
;
254 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
255 extern int select_nohz_load_balancer(int cpu
);
257 static inline int select_nohz_load_balancer(int cpu
)
264 * Only dump TASK_* tasks. (0 for all tasks)
266 extern void show_state_filter(unsigned long state_filter
);
268 static inline void show_state(void)
270 show_state_filter(0);
273 extern void show_regs(struct pt_regs
*);
276 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
277 * task), SP is the stack pointer of the first frame that should be shown in the back
278 * trace (or NULL if the entire call-chain of the task should be shown).
280 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
282 void io_schedule(void);
283 long io_schedule_timeout(long timeout
);
285 extern void cpu_init (void);
286 extern void trap_init(void);
287 extern void update_process_times(int user
);
288 extern void scheduler_tick(void);
290 extern void sched_show_task(struct task_struct
*p
);
292 #ifdef CONFIG_DETECT_SOFTLOCKUP
293 extern void softlockup_tick(void);
294 extern void touch_softlockup_watchdog(void);
295 extern void touch_all_softlockup_watchdogs(void);
296 extern unsigned int softlockup_panic
;
297 extern unsigned long sysctl_hung_task_check_count
;
298 extern unsigned long sysctl_hung_task_timeout_secs
;
299 extern unsigned long sysctl_hung_task_warnings
;
300 extern int softlockup_thresh
;
302 static inline void softlockup_tick(void)
305 static inline void spawn_softlockup_task(void)
308 static inline void touch_softlockup_watchdog(void)
311 static inline void touch_all_softlockup_watchdogs(void)
317 /* Attach to any functions which should be ignored in wchan output. */
318 #define __sched __attribute__((__section__(".sched.text")))
320 /* Linker adds these: start and end of __sched functions */
321 extern char __sched_text_start
[], __sched_text_end
[];
323 /* Is this address in the __sched functions? */
324 extern int in_sched_functions(unsigned long addr
);
326 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
327 extern signed long schedule_timeout(signed long timeout
);
328 extern signed long schedule_timeout_interruptible(signed long timeout
);
329 extern signed long schedule_timeout_killable(signed long timeout
);
330 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
331 asmlinkage
void schedule(void);
334 struct user_namespace
;
336 /* Maximum number of active map areas.. This is a random (large) number */
337 #define DEFAULT_MAX_MAP_COUNT 65536
339 extern int sysctl_max_map_count
;
341 #include <linux/aio.h>
344 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
345 unsigned long, unsigned long);
347 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
348 unsigned long len
, unsigned long pgoff
,
349 unsigned long flags
);
350 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
351 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
353 #if USE_SPLIT_PTLOCKS
355 * The mm counters are not protected by its page_table_lock,
356 * so must be incremented atomically.
358 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
359 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
360 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
361 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
362 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
364 #else /* !USE_SPLIT_PTLOCKS */
366 * The mm counters are protected by its page_table_lock,
367 * so can be incremented directly.
369 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
370 #define get_mm_counter(mm, member) ((mm)->_##member)
371 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
372 #define inc_mm_counter(mm, member) (mm)->_##member++
373 #define dec_mm_counter(mm, member) (mm)->_##member--
375 #endif /* !USE_SPLIT_PTLOCKS */
377 #define get_mm_rss(mm) \
378 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
379 #define update_hiwater_rss(mm) do { \
380 unsigned long _rss = get_mm_rss(mm); \
381 if ((mm)->hiwater_rss < _rss) \
382 (mm)->hiwater_rss = _rss; \
384 #define update_hiwater_vm(mm) do { \
385 if ((mm)->hiwater_vm < (mm)->total_vm) \
386 (mm)->hiwater_vm = (mm)->total_vm; \
389 #define get_mm_hiwater_rss(mm) max((mm)->hiwater_rss, get_mm_rss(mm))
390 #define get_mm_hiwater_vm(mm) max((mm)->hiwater_vm, (mm)->total_vm)
392 extern void set_dumpable(struct mm_struct
*mm
, int value
);
393 extern int get_dumpable(struct mm_struct
*mm
);
397 #define MMF_DUMPABLE 0 /* core dump is permitted */
398 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
399 #define MMF_DUMPABLE_BITS 2
401 /* coredump filter bits */
402 #define MMF_DUMP_ANON_PRIVATE 2
403 #define MMF_DUMP_ANON_SHARED 3
404 #define MMF_DUMP_MAPPED_PRIVATE 4
405 #define MMF_DUMP_MAPPED_SHARED 5
406 #define MMF_DUMP_ELF_HEADERS 6
407 #define MMF_DUMP_HUGETLB_PRIVATE 7
408 #define MMF_DUMP_HUGETLB_SHARED 8
409 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
410 #define MMF_DUMP_FILTER_BITS 7
411 #define MMF_DUMP_FILTER_MASK \
412 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
413 #define MMF_DUMP_FILTER_DEFAULT \
414 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
415 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
417 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
418 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
420 # define MMF_DUMP_MASK_DEFAULT_ELF 0
423 struct sighand_struct
{
425 struct k_sigaction action
[_NSIG
];
427 wait_queue_head_t signalfd_wqh
;
430 struct pacct_struct
{
433 unsigned long ac_mem
;
434 cputime_t ac_utime
, ac_stime
;
435 unsigned long ac_minflt
, ac_majflt
;
439 * struct task_cputime - collected CPU time counts
440 * @utime: time spent in user mode, in &cputime_t units
441 * @stime: time spent in kernel mode, in &cputime_t units
442 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
444 * This structure groups together three kinds of CPU time that are
445 * tracked for threads and thread groups. Most things considering
446 * CPU time want to group these counts together and treat all three
447 * of them in parallel.
449 struct task_cputime
{
452 unsigned long long sum_exec_runtime
;
454 /* Alternate field names when used to cache expirations. */
455 #define prof_exp stime
456 #define virt_exp utime
457 #define sched_exp sum_exec_runtime
460 * struct thread_group_cputime - thread group interval timer counts
461 * @totals: thread group interval timers; substructure for
462 * uniprocessor kernel, per-cpu for SMP kernel.
464 * This structure contains the version of task_cputime, above, that is
465 * used for thread group CPU clock calculations.
467 struct thread_group_cputime
{
468 struct task_cputime
*totals
;
472 * NOTE! "signal_struct" does not have it's own
473 * locking, because a shared signal_struct always
474 * implies a shared sighand_struct, so locking
475 * sighand_struct is always a proper superset of
476 * the locking of signal_struct.
478 struct signal_struct
{
482 wait_queue_head_t wait_chldexit
; /* for wait4() */
484 /* current thread group signal load-balancing target: */
485 struct task_struct
*curr_target
;
487 /* shared signal handling: */
488 struct sigpending shared_pending
;
490 /* thread group exit support */
493 * - notify group_exit_task when ->count is equal to notify_count
494 * - everyone except group_exit_task is stopped during signal delivery
495 * of fatal signals, group_exit_task processes the signal.
498 struct task_struct
*group_exit_task
;
500 /* thread group stop support, overloads group_exit_code too */
501 int group_stop_count
;
502 unsigned int flags
; /* see SIGNAL_* flags below */
504 /* POSIX.1b Interval Timers */
505 struct list_head posix_timers
;
507 /* ITIMER_REAL timer for the process */
508 struct hrtimer real_timer
;
509 struct pid
*leader_pid
;
510 ktime_t it_real_incr
;
512 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
513 cputime_t it_prof_expires
, it_virt_expires
;
514 cputime_t it_prof_incr
, it_virt_incr
;
517 * Thread group totals for process CPU clocks.
518 * See thread_group_cputime(), et al, for details.
520 struct thread_group_cputime cputime
;
522 /* Earliest-expiration cache. */
523 struct task_cputime cputime_expires
;
525 struct list_head cpu_timers
[3];
527 /* job control IDs */
530 * pgrp and session fields are deprecated.
531 * use the task_session_Xnr and task_pgrp_Xnr routines below
535 pid_t pgrp __deprecated
;
539 struct pid
*tty_old_pgrp
;
542 pid_t session __deprecated
;
546 /* boolean value for session group leader */
549 struct tty_struct
*tty
; /* NULL if no tty */
552 * Cumulative resource counters for dead threads in the group,
553 * and for reaped dead child processes forked by this group.
554 * Live threads maintain their own counters and add to these
555 * in __exit_signal, except for the group leader.
557 cputime_t cutime
, cstime
;
560 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
561 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
562 unsigned long inblock
, oublock
, cinblock
, coublock
;
563 struct task_io_accounting ioac
;
566 * We don't bother to synchronize most readers of this at all,
567 * because there is no reader checking a limit that actually needs
568 * to get both rlim_cur and rlim_max atomically, and either one
569 * alone is a single word that can safely be read normally.
570 * getrlimit/setrlimit use task_lock(current->group_leader) to
571 * protect this instead of the siglock, because they really
572 * have no need to disable irqs.
574 struct rlimit rlim
[RLIM_NLIMITS
];
576 #ifdef CONFIG_BSD_PROCESS_ACCT
577 struct pacct_struct pacct
; /* per-process accounting information */
579 #ifdef CONFIG_TASKSTATS
580 struct taskstats
*stats
;
584 struct tty_audit_buf
*tty_audit_buf
;
588 /* Context switch must be unlocked if interrupts are to be enabled */
589 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
590 # define __ARCH_WANT_UNLOCKED_CTXSW
594 * Bits in flags field of signal_struct.
596 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
597 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
598 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
599 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
601 * Pending notifications to parent.
603 #define SIGNAL_CLD_STOPPED 0x00000010
604 #define SIGNAL_CLD_CONTINUED 0x00000020
605 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
607 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
609 /* If true, all threads except ->group_exit_task have pending SIGKILL */
610 static inline int signal_group_exit(const struct signal_struct
*sig
)
612 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
613 (sig
->group_exit_task
!= NULL
);
617 * Some day this will be a full-fledged user tracking system..
620 atomic_t __count
; /* reference count */
621 atomic_t processes
; /* How many processes does this user have? */
622 atomic_t files
; /* How many open files does this user have? */
623 atomic_t sigpending
; /* How many pending signals does this user have? */
624 #ifdef CONFIG_INOTIFY_USER
625 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
626 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
629 atomic_t epoll_devs
; /* The number of epoll descriptors currently open */
630 atomic_t epoll_watches
; /* The number of file descriptors currently watched */
632 #ifdef CONFIG_POSIX_MQUEUE
633 /* protected by mq_lock */
634 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
636 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
639 struct key
*uid_keyring
; /* UID specific keyring */
640 struct key
*session_keyring
; /* UID's default session keyring */
643 /* Hash table maintenance information */
644 struct hlist_node uidhash_node
;
646 struct user_namespace
*user_ns
;
648 #ifdef CONFIG_USER_SCHED
649 struct task_group
*tg
;
652 struct work_struct work
;
657 extern int uids_sysfs_init(void);
659 extern struct user_struct
*find_user(uid_t
);
661 extern struct user_struct root_user
;
662 #define INIT_USER (&root_user)
665 struct backing_dev_info
;
666 struct reclaim_state
;
668 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
670 /* cumulative counters */
671 unsigned long pcount
; /* # of times run on this cpu */
672 unsigned long long run_delay
; /* time spent waiting on a runqueue */
675 unsigned long long last_arrival
,/* when we last ran on a cpu */
676 last_queued
; /* when we were last queued to run */
677 #ifdef CONFIG_SCHEDSTATS
679 unsigned int bkl_count
;
682 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
684 #ifdef CONFIG_TASK_DELAY_ACCT
685 struct task_delay_info
{
687 unsigned int flags
; /* Private per-task flags */
689 /* For each stat XXX, add following, aligned appropriately
691 * struct timespec XXX_start, XXX_end;
695 * Atomicity of updates to XXX_delay, XXX_count protected by
696 * single lock above (split into XXX_lock if contention is an issue).
700 * XXX_count is incremented on every XXX operation, the delay
701 * associated with the operation is added to XXX_delay.
702 * XXX_delay contains the accumulated delay time in nanoseconds.
704 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
705 u64 blkio_delay
; /* wait for sync block io completion */
706 u64 swapin_delay
; /* wait for swapin block io completion */
707 u32 blkio_count
; /* total count of the number of sync block */
708 /* io operations performed */
709 u32 swapin_count
; /* total count of the number of swapin block */
710 /* io operations performed */
712 struct timespec freepages_start
, freepages_end
;
713 u64 freepages_delay
; /* wait for memory reclaim */
714 u32 freepages_count
; /* total count of memory reclaim */
716 #endif /* CONFIG_TASK_DELAY_ACCT */
718 static inline int sched_info_on(void)
720 #ifdef CONFIG_SCHEDSTATS
722 #elif defined(CONFIG_TASK_DELAY_ACCT)
723 extern int delayacct_on
;
738 * sched-domains (multiprocessor balancing) declarations:
742 * Increase resolution of nice-level calculations:
744 #define SCHED_LOAD_SHIFT 10
745 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
747 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
750 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
751 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
752 #define SD_BALANCE_EXEC 4 /* Balance on exec */
753 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
754 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
755 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
756 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
757 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
758 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
759 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
760 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
761 #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
763 enum powersavings_balance_level
{
764 POWERSAVINGS_BALANCE_NONE
= 0, /* No power saving load balance */
765 POWERSAVINGS_BALANCE_BASIC
, /* Fill one thread/core/package
766 * first for long running threads
768 POWERSAVINGS_BALANCE_WAKEUP
, /* Also bias task wakeups to semi-idle
769 * cpu package for power savings
771 MAX_POWERSAVINGS_BALANCE_LEVELS
774 extern int sched_mc_power_savings
, sched_smt_power_savings
;
776 static inline int sd_balance_for_mc_power(void)
778 if (sched_smt_power_savings
)
779 return SD_POWERSAVINGS_BALANCE
;
784 static inline int sd_balance_for_package_power(void)
786 if (sched_mc_power_savings
| sched_smt_power_savings
)
787 return SD_POWERSAVINGS_BALANCE
;
793 * Optimise SD flags for power savings:
794 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
795 * Keep default SD flags if sched_{smt,mc}_power_saving=0
798 static inline int sd_power_saving_flags(void)
800 if (sched_mc_power_savings
| sched_smt_power_savings
)
801 return SD_BALANCE_NEWIDLE
;
807 struct sched_group
*next
; /* Must be a circular list */
810 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
811 * single CPU. This is read only (except for setup, hotplug CPU).
812 * Note : Never change cpu_power without recompute its reciprocal
814 unsigned int __cpu_power
;
816 * reciprocal value of cpu_power to avoid expensive divides
817 * (see include/linux/reciprocal_div.h)
819 u32 reciprocal_cpu_power
;
821 unsigned long cpumask
[];
824 static inline struct cpumask
*sched_group_cpus(struct sched_group
*sg
)
826 return to_cpumask(sg
->cpumask
);
829 enum sched_domain_level
{
839 struct sched_domain_attr
{
840 int relax_domain_level
;
843 #define SD_ATTR_INIT (struct sched_domain_attr) { \
844 .relax_domain_level = -1, \
847 struct sched_domain
{
848 /* These fields must be setup */
849 struct sched_domain
*parent
; /* top domain must be null terminated */
850 struct sched_domain
*child
; /* bottom domain must be null terminated */
851 struct sched_group
*groups
; /* the balancing groups of the domain */
852 unsigned long min_interval
; /* Minimum balance interval ms */
853 unsigned long max_interval
; /* Maximum balance interval ms */
854 unsigned int busy_factor
; /* less balancing by factor if busy */
855 unsigned int imbalance_pct
; /* No balance until over watermark */
856 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
857 unsigned int busy_idx
;
858 unsigned int idle_idx
;
859 unsigned int newidle_idx
;
860 unsigned int wake_idx
;
861 unsigned int forkexec_idx
;
862 int flags
; /* See SD_* */
863 enum sched_domain_level level
;
865 /* Runtime fields. */
866 unsigned long last_balance
; /* init to jiffies. units in jiffies */
867 unsigned int balance_interval
; /* initialise to 1. units in ms. */
868 unsigned int nr_balance_failed
; /* initialise to 0 */
872 #ifdef CONFIG_SCHEDSTATS
873 /* load_balance() stats */
874 unsigned int lb_count
[CPU_MAX_IDLE_TYPES
];
875 unsigned int lb_failed
[CPU_MAX_IDLE_TYPES
];
876 unsigned int lb_balanced
[CPU_MAX_IDLE_TYPES
];
877 unsigned int lb_imbalance
[CPU_MAX_IDLE_TYPES
];
878 unsigned int lb_gained
[CPU_MAX_IDLE_TYPES
];
879 unsigned int lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
880 unsigned int lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
881 unsigned int lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
883 /* Active load balancing */
884 unsigned int alb_count
;
885 unsigned int alb_failed
;
886 unsigned int alb_pushed
;
888 /* SD_BALANCE_EXEC stats */
889 unsigned int sbe_count
;
890 unsigned int sbe_balanced
;
891 unsigned int sbe_pushed
;
893 /* SD_BALANCE_FORK stats */
894 unsigned int sbf_count
;
895 unsigned int sbf_balanced
;
896 unsigned int sbf_pushed
;
898 /* try_to_wake_up() stats */
899 unsigned int ttwu_wake_remote
;
900 unsigned int ttwu_move_affine
;
901 unsigned int ttwu_move_balance
;
903 #ifdef CONFIG_SCHED_DEBUG
907 /* span of all CPUs in this domain */
908 unsigned long span
[];
911 static inline struct cpumask
*sched_domain_span(struct sched_domain
*sd
)
913 return to_cpumask(sd
->span
);
916 extern void partition_sched_domains(int ndoms_new
, struct cpumask
*doms_new
,
917 struct sched_domain_attr
*dattr_new
);
919 /* Test a flag in parent sched domain */
920 static inline int test_sd_parent(struct sched_domain
*sd
, int flag
)
922 if (sd
->parent
&& (sd
->parent
->flags
& flag
))
928 #else /* CONFIG_SMP */
930 struct sched_domain_attr
;
933 partition_sched_domains(int ndoms_new
, struct cpumask
*doms_new
,
934 struct sched_domain_attr
*dattr_new
)
937 #endif /* !CONFIG_SMP */
939 struct io_context
; /* See blkdev.h */
942 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
943 extern void prefetch_stack(struct task_struct
*t
);
945 static inline void prefetch_stack(struct task_struct
*t
) { }
948 struct audit_context
; /* See audit.c */
950 struct pipe_inode_info
;
951 struct uts_namespace
;
957 const struct sched_class
*next
;
959 void (*enqueue_task
) (struct rq
*rq
, struct task_struct
*p
, int wakeup
);
960 void (*dequeue_task
) (struct rq
*rq
, struct task_struct
*p
, int sleep
);
961 void (*yield_task
) (struct rq
*rq
);
963 void (*check_preempt_curr
) (struct rq
*rq
, struct task_struct
*p
, int sync
);
965 struct task_struct
* (*pick_next_task
) (struct rq
*rq
);
966 void (*put_prev_task
) (struct rq
*rq
, struct task_struct
*p
);
969 int (*select_task_rq
)(struct task_struct
*p
, int sync
);
971 unsigned long (*load_balance
) (struct rq
*this_rq
, int this_cpu
,
972 struct rq
*busiest
, unsigned long max_load_move
,
973 struct sched_domain
*sd
, enum cpu_idle_type idle
,
974 int *all_pinned
, int *this_best_prio
);
976 int (*move_one_task
) (struct rq
*this_rq
, int this_cpu
,
977 struct rq
*busiest
, struct sched_domain
*sd
,
978 enum cpu_idle_type idle
);
979 void (*pre_schedule
) (struct rq
*this_rq
, struct task_struct
*task
);
980 void (*post_schedule
) (struct rq
*this_rq
);
981 void (*task_wake_up
) (struct rq
*this_rq
, struct task_struct
*task
);
983 void (*set_cpus_allowed
)(struct task_struct
*p
,
984 const struct cpumask
*newmask
);
986 void (*rq_online
)(struct rq
*rq
);
987 void (*rq_offline
)(struct rq
*rq
);
990 void (*set_curr_task
) (struct rq
*rq
);
991 void (*task_tick
) (struct rq
*rq
, struct task_struct
*p
, int queued
);
992 void (*task_new
) (struct rq
*rq
, struct task_struct
*p
);
994 void (*switched_from
) (struct rq
*this_rq
, struct task_struct
*task
,
996 void (*switched_to
) (struct rq
*this_rq
, struct task_struct
*task
,
998 void (*prio_changed
) (struct rq
*this_rq
, struct task_struct
*task
,
999 int oldprio
, int running
);
1001 #ifdef CONFIG_FAIR_GROUP_SCHED
1002 void (*moved_group
) (struct task_struct
*p
);
1006 struct load_weight
{
1007 unsigned long weight
, inv_weight
;
1011 * CFS stats for a schedulable entity (task, task-group etc)
1013 * Current field usage histogram:
1020 struct sched_entity
{
1021 struct load_weight load
; /* for load-balancing */
1022 struct rb_node run_node
;
1023 struct list_head group_node
;
1027 u64 sum_exec_runtime
;
1029 u64 prev_sum_exec_runtime
;
1034 #ifdef CONFIG_SCHEDSTATS
1042 s64 sum_sleep_runtime
;
1050 u64 nr_migrations_cold
;
1051 u64 nr_failed_migrations_affine
;
1052 u64 nr_failed_migrations_running
;
1053 u64 nr_failed_migrations_hot
;
1054 u64 nr_forced_migrations
;
1055 u64 nr_forced2_migrations
;
1058 u64 nr_wakeups_sync
;
1059 u64 nr_wakeups_migrate
;
1060 u64 nr_wakeups_local
;
1061 u64 nr_wakeups_remote
;
1062 u64 nr_wakeups_affine
;
1063 u64 nr_wakeups_affine_attempts
;
1064 u64 nr_wakeups_passive
;
1065 u64 nr_wakeups_idle
;
1068 #ifdef CONFIG_FAIR_GROUP_SCHED
1069 struct sched_entity
*parent
;
1070 /* rq on which this entity is (to be) queued: */
1071 struct cfs_rq
*cfs_rq
;
1072 /* rq "owned" by this entity/group: */
1073 struct cfs_rq
*my_q
;
1077 struct sched_rt_entity
{
1078 struct list_head run_list
;
1079 unsigned long timeout
;
1080 unsigned int time_slice
;
1081 int nr_cpus_allowed
;
1083 struct sched_rt_entity
*back
;
1084 #ifdef CONFIG_RT_GROUP_SCHED
1085 struct sched_rt_entity
*parent
;
1086 /* rq on which this entity is (to be) queued: */
1087 struct rt_rq
*rt_rq
;
1088 /* rq "owned" by this entity/group: */
1093 struct task_struct
{
1094 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
1097 unsigned int flags
; /* per process flags, defined below */
1098 unsigned int ptrace
;
1100 int lock_depth
; /* BKL lock depth */
1103 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1108 int prio
, static_prio
, normal_prio
;
1109 unsigned int rt_priority
;
1110 const struct sched_class
*sched_class
;
1111 struct sched_entity se
;
1112 struct sched_rt_entity rt
;
1114 #ifdef CONFIG_PREEMPT_NOTIFIERS
1115 /* list of struct preempt_notifier: */
1116 struct hlist_head preempt_notifiers
;
1120 * fpu_counter contains the number of consecutive context switches
1121 * that the FPU is used. If this is over a threshold, the lazy fpu
1122 * saving becomes unlazy to save the trap. This is an unsigned char
1123 * so that after 256 times the counter wraps and the behavior turns
1124 * lazy again; this to deal with bursty apps that only use FPU for
1127 unsigned char fpu_counter
;
1128 s8 oomkilladj
; /* OOM kill score adjustment (bit shift). */
1129 #ifdef CONFIG_BLK_DEV_IO_TRACE
1130 unsigned int btrace_seq
;
1133 unsigned int policy
;
1134 cpumask_t cpus_allowed
;
1136 #ifdef CONFIG_PREEMPT_RCU
1137 int rcu_read_lock_nesting
;
1138 int rcu_flipctr_idx
;
1139 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1141 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1142 struct sched_info sched_info
;
1145 struct list_head tasks
;
1147 struct mm_struct
*mm
, *active_mm
;
1150 struct linux_binfmt
*binfmt
;
1152 int exit_code
, exit_signal
;
1153 int pdeath_signal
; /* The signal sent when the parent dies */
1155 unsigned int personality
;
1156 unsigned did_exec
:1;
1160 /* Canary value for the -fstack-protector gcc feature */
1161 unsigned long stack_canary
;
1164 * pointers to (original) parent process, youngest child, younger sibling,
1165 * older sibling, respectively. (p->father can be replaced with
1166 * p->real_parent->pid)
1168 struct task_struct
*real_parent
; /* real parent process */
1169 struct task_struct
*parent
; /* recipient of SIGCHLD, wait4() reports */
1171 * children/sibling forms the list of my natural children
1173 struct list_head children
; /* list of my children */
1174 struct list_head sibling
; /* linkage in my parent's children list */
1175 struct task_struct
*group_leader
; /* threadgroup leader */
1178 * ptraced is the list of tasks this task is using ptrace on.
1179 * This includes both natural children and PTRACE_ATTACH targets.
1180 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1182 struct list_head ptraced
;
1183 struct list_head ptrace_entry
;
1185 #ifdef CONFIG_X86_PTRACE_BTS
1187 * This is the tracer handle for the ptrace BTS extension.
1188 * This field actually belongs to the ptracer task.
1190 struct bts_tracer
*bts
;
1192 * The buffer to hold the BTS data.
1196 #endif /* CONFIG_X86_PTRACE_BTS */
1198 /* PID/PID hash table linkage. */
1199 struct pid_link pids
[PIDTYPE_MAX
];
1200 struct list_head thread_group
;
1202 struct completion
*vfork_done
; /* for vfork() */
1203 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
1204 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
1206 cputime_t utime
, stime
, utimescaled
, stimescaled
;
1208 cputime_t prev_utime
, prev_stime
;
1209 unsigned long nvcsw
, nivcsw
; /* context switch counts */
1210 struct timespec start_time
; /* monotonic time */
1211 struct timespec real_start_time
; /* boot based time */
1212 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1213 unsigned long min_flt
, maj_flt
;
1215 struct task_cputime cputime_expires
;
1216 struct list_head cpu_timers
[3];
1218 /* process credentials */
1219 const struct cred
*real_cred
; /* objective and real subjective task
1220 * credentials (COW) */
1221 const struct cred
*cred
; /* effective (overridable) subjective task
1222 * credentials (COW) */
1223 struct mutex cred_exec_mutex
; /* execve vs ptrace cred calculation mutex */
1225 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
1226 - access with [gs]et_task_comm (which lock
1227 it with task_lock())
1228 - initialized normally by flush_old_exec */
1229 /* file system info */
1230 int link_count
, total_link_count
;
1231 #ifdef CONFIG_SYSVIPC
1233 struct sysv_sem sysvsem
;
1235 #ifdef CONFIG_DETECT_SOFTLOCKUP
1236 /* hung task detection */
1237 unsigned long last_switch_timestamp
;
1238 unsigned long last_switch_count
;
1240 /* CPU-specific state of this task */
1241 struct thread_struct thread
;
1242 /* filesystem information */
1243 struct fs_struct
*fs
;
1244 /* open file information */
1245 struct files_struct
*files
;
1247 struct nsproxy
*nsproxy
;
1248 /* signal handlers */
1249 struct signal_struct
*signal
;
1250 struct sighand_struct
*sighand
;
1252 sigset_t blocked
, real_blocked
;
1253 sigset_t saved_sigmask
; /* restored if set_restore_sigmask() was used */
1254 struct sigpending pending
;
1256 unsigned long sas_ss_sp
;
1258 int (*notifier
)(void *priv
);
1259 void *notifier_data
;
1260 sigset_t
*notifier_mask
;
1261 struct audit_context
*audit_context
;
1262 #ifdef CONFIG_AUDITSYSCALL
1264 unsigned int sessionid
;
1268 /* Thread group tracking */
1271 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1272 spinlock_t alloc_lock
;
1274 /* Protection of the PI data structures: */
1277 #ifdef CONFIG_RT_MUTEXES
1278 /* PI waiters blocked on a rt_mutex held by this task */
1279 struct plist_head pi_waiters
;
1280 /* Deadlock detection and priority inheritance handling */
1281 struct rt_mutex_waiter
*pi_blocked_on
;
1284 #ifdef CONFIG_DEBUG_MUTEXES
1285 /* mutex deadlock detection */
1286 struct mutex_waiter
*blocked_on
;
1288 #ifdef CONFIG_TRACE_IRQFLAGS
1289 unsigned int irq_events
;
1290 int hardirqs_enabled
;
1291 unsigned long hardirq_enable_ip
;
1292 unsigned int hardirq_enable_event
;
1293 unsigned long hardirq_disable_ip
;
1294 unsigned int hardirq_disable_event
;
1295 int softirqs_enabled
;
1296 unsigned long softirq_disable_ip
;
1297 unsigned int softirq_disable_event
;
1298 unsigned long softirq_enable_ip
;
1299 unsigned int softirq_enable_event
;
1300 int hardirq_context
;
1301 int softirq_context
;
1303 #ifdef CONFIG_LOCKDEP
1304 # define MAX_LOCK_DEPTH 48UL
1307 unsigned int lockdep_recursion
;
1308 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1311 /* journalling filesystem info */
1314 /* stacked block device info */
1315 struct bio
*bio_list
, **bio_tail
;
1318 struct reclaim_state
*reclaim_state
;
1320 struct backing_dev_info
*backing_dev_info
;
1322 struct io_context
*io_context
;
1324 unsigned long ptrace_message
;
1325 siginfo_t
*last_siginfo
; /* For ptrace use. */
1326 struct task_io_accounting ioac
;
1327 #if defined(CONFIG_TASK_XACCT)
1328 u64 acct_rss_mem1
; /* accumulated rss usage */
1329 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1330 cputime_t acct_timexpd
; /* stime + utime since last update */
1332 #ifdef CONFIG_CPUSETS
1333 nodemask_t mems_allowed
;
1334 int cpuset_mems_generation
;
1335 int cpuset_mem_spread_rotor
;
1337 #ifdef CONFIG_CGROUPS
1338 /* Control Group info protected by css_set_lock */
1339 struct css_set
*cgroups
;
1340 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1341 struct list_head cg_list
;
1344 struct robust_list_head __user
*robust_list
;
1345 #ifdef CONFIG_COMPAT
1346 struct compat_robust_list_head __user
*compat_robust_list
;
1348 struct list_head pi_state_list
;
1349 struct futex_pi_state
*pi_state_cache
;
1352 struct mempolicy
*mempolicy
;
1355 atomic_t fs_excl
; /* holding fs exclusive resources */
1356 struct rcu_head rcu
;
1359 * cache last used pipe for splice
1361 struct pipe_inode_info
*splice_pipe
;
1362 #ifdef CONFIG_TASK_DELAY_ACCT
1363 struct task_delay_info
*delays
;
1365 #ifdef CONFIG_FAULT_INJECTION
1368 struct prop_local_single dirties
;
1369 #ifdef CONFIG_LATENCYTOP
1370 int latency_record_count
;
1371 struct latency_record latency_record
[LT_SAVECOUNT
];
1374 * time slack values; these are used to round up poll() and
1375 * select() etc timeout values. These are in nanoseconds.
1377 unsigned long timer_slack_ns
;
1378 unsigned long default_timer_slack_ns
;
1380 struct list_head
*scm_work_list
;
1381 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1382 /* Index of current stored adress in ret_stack */
1384 /* Stack of return addresses for return function tracing */
1385 struct ftrace_ret_stack
*ret_stack
;
1387 * Number of functions that haven't been traced
1388 * because of depth overrun.
1390 atomic_t trace_overrun
;
1391 /* Pause for the tracing */
1392 atomic_t tracing_graph_pause
;
1394 #ifdef CONFIG_TRACING
1395 /* state flags for use by tracers */
1396 unsigned long trace
;
1401 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1402 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1403 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1404 * values are inverted: lower p->prio value means higher priority.
1406 * The MAX_USER_RT_PRIO value allows the actual maximum
1407 * RT priority to be separate from the value exported to
1408 * user-space. This allows kernel threads to set their
1409 * priority to a value higher than any user task. Note:
1410 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1413 #define MAX_USER_RT_PRIO 100
1414 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1416 #define MAX_PRIO (MAX_RT_PRIO + 40)
1417 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1419 static inline int rt_prio(int prio
)
1421 if (unlikely(prio
< MAX_RT_PRIO
))
1426 static inline int rt_task(struct task_struct
*p
)
1428 return rt_prio(p
->prio
);
1431 static inline void set_task_session(struct task_struct
*tsk
, pid_t session
)
1433 tsk
->signal
->__session
= session
;
1436 static inline void set_task_pgrp(struct task_struct
*tsk
, pid_t pgrp
)
1438 tsk
->signal
->__pgrp
= pgrp
;
1441 static inline struct pid
*task_pid(struct task_struct
*task
)
1443 return task
->pids
[PIDTYPE_PID
].pid
;
1446 static inline struct pid
*task_tgid(struct task_struct
*task
)
1448 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1451 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1453 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1456 static inline struct pid
*task_session(struct task_struct
*task
)
1458 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1461 struct pid_namespace
;
1464 * the helpers to get the task's different pids as they are seen
1465 * from various namespaces
1467 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1468 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1470 * task_xid_nr_ns() : id seen from the ns specified;
1472 * set_task_vxid() : assigns a virtual id to a task;
1474 * see also pid_nr() etc in include/linux/pid.h
1477 static inline pid_t
task_pid_nr(struct task_struct
*tsk
)
1482 pid_t
task_pid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1484 static inline pid_t
task_pid_vnr(struct task_struct
*tsk
)
1486 return pid_vnr(task_pid(tsk
));
1490 static inline pid_t
task_tgid_nr(struct task_struct
*tsk
)
1495 pid_t
task_tgid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1497 static inline pid_t
task_tgid_vnr(struct task_struct
*tsk
)
1499 return pid_vnr(task_tgid(tsk
));
1503 static inline pid_t
task_pgrp_nr(struct task_struct
*tsk
)
1505 return tsk
->signal
->__pgrp
;
1508 pid_t
task_pgrp_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1510 static inline pid_t
task_pgrp_vnr(struct task_struct
*tsk
)
1512 return pid_vnr(task_pgrp(tsk
));
1516 static inline pid_t
task_session_nr(struct task_struct
*tsk
)
1518 return tsk
->signal
->__session
;
1521 pid_t
task_session_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1523 static inline pid_t
task_session_vnr(struct task_struct
*tsk
)
1525 return pid_vnr(task_session(tsk
));
1530 * pid_alive - check that a task structure is not stale
1531 * @p: Task structure to be checked.
1533 * Test if a process is not yet dead (at most zombie state)
1534 * If pid_alive fails, then pointers within the task structure
1535 * can be stale and must not be dereferenced.
1537 static inline int pid_alive(struct task_struct
*p
)
1539 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1543 * is_global_init - check if a task structure is init
1544 * @tsk: Task structure to be checked.
1546 * Check if a task structure is the first user space task the kernel created.
1548 static inline int is_global_init(struct task_struct
*tsk
)
1550 return tsk
->pid
== 1;
1554 * is_container_init:
1555 * check whether in the task is init in its own pid namespace.
1557 extern int is_container_init(struct task_struct
*tsk
);
1559 extern struct pid
*cad_pid
;
1561 extern void free_task(struct task_struct
*tsk
);
1562 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1564 extern void __put_task_struct(struct task_struct
*t
);
1566 static inline void put_task_struct(struct task_struct
*t
)
1568 if (atomic_dec_and_test(&t
->usage
))
1569 __put_task_struct(t
);
1572 extern cputime_t
task_utime(struct task_struct
*p
);
1573 extern cputime_t
task_stime(struct task_struct
*p
);
1574 extern cputime_t
task_gtime(struct task_struct
*p
);
1579 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1580 /* Not implemented yet, only for 486*/
1581 #define PF_STARTING 0x00000002 /* being created */
1582 #define PF_EXITING 0x00000004 /* getting shut down */
1583 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1584 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1585 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1586 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1587 #define PF_DUMPCORE 0x00000200 /* dumped core */
1588 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1589 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1590 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1591 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1592 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1593 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1594 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1595 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1596 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1597 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1598 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1599 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1600 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1601 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1602 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1603 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1604 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1605 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1606 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1607 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1610 * Only the _current_ task can read/write to tsk->flags, but other
1611 * tasks can access tsk->flags in readonly mode for example
1612 * with tsk_used_math (like during threaded core dumping).
1613 * There is however an exception to this rule during ptrace
1614 * or during fork: the ptracer task is allowed to write to the
1615 * child->flags of its traced child (same goes for fork, the parent
1616 * can write to the child->flags), because we're guaranteed the
1617 * child is not running and in turn not changing child->flags
1618 * at the same time the parent does it.
1620 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1621 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1622 #define clear_used_math() clear_stopped_child_used_math(current)
1623 #define set_used_math() set_stopped_child_used_math(current)
1624 #define conditional_stopped_child_used_math(condition, child) \
1625 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1626 #define conditional_used_math(condition) \
1627 conditional_stopped_child_used_math(condition, current)
1628 #define copy_to_stopped_child_used_math(child) \
1629 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1630 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1631 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1632 #define used_math() tsk_used_math(current)
1635 extern int set_cpus_allowed_ptr(struct task_struct
*p
,
1636 const struct cpumask
*new_mask
);
1638 static inline int set_cpus_allowed_ptr(struct task_struct
*p
,
1639 const struct cpumask
*new_mask
)
1641 if (!cpumask_test_cpu(0, new_mask
))
1646 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1648 return set_cpus_allowed_ptr(p
, &new_mask
);
1651 extern unsigned long long sched_clock(void);
1653 extern void sched_clock_init(void);
1654 extern u64
sched_clock_cpu(int cpu
);
1656 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1657 static inline void sched_clock_tick(void)
1661 static inline void sched_clock_idle_sleep_event(void)
1665 static inline void sched_clock_idle_wakeup_event(u64 delta_ns
)
1669 extern void sched_clock_tick(void);
1670 extern void sched_clock_idle_sleep_event(void);
1671 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1675 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1676 * clock constructed from sched_clock():
1678 extern unsigned long long cpu_clock(int cpu
);
1680 extern unsigned long long
1681 task_sched_runtime(struct task_struct
*task
);
1682 extern unsigned long long thread_group_sched_runtime(struct task_struct
*task
);
1684 /* sched_exec is called by processes performing an exec */
1686 extern void sched_exec(void);
1688 #define sched_exec() {}
1691 extern void sched_clock_idle_sleep_event(void);
1692 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1694 #ifdef CONFIG_HOTPLUG_CPU
1695 extern void idle_task_exit(void);
1697 static inline void idle_task_exit(void) {}
1700 extern void sched_idle_next(void);
1702 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1703 extern void wake_up_idle_cpu(int cpu
);
1705 static inline void wake_up_idle_cpu(int cpu
) { }
1708 extern unsigned int sysctl_sched_latency
;
1709 extern unsigned int sysctl_sched_min_granularity
;
1710 extern unsigned int sysctl_sched_wakeup_granularity
;
1711 extern unsigned int sysctl_sched_shares_ratelimit
;
1712 extern unsigned int sysctl_sched_shares_thresh
;
1713 #ifdef CONFIG_SCHED_DEBUG
1714 extern unsigned int sysctl_sched_child_runs_first
;
1715 extern unsigned int sysctl_sched_features
;
1716 extern unsigned int sysctl_sched_migration_cost
;
1717 extern unsigned int sysctl_sched_nr_migrate
;
1719 int sched_nr_latency_handler(struct ctl_table
*table
, int write
,
1720 struct file
*file
, void __user
*buffer
, size_t *length
,
1723 extern unsigned int sysctl_sched_rt_period
;
1724 extern int sysctl_sched_rt_runtime
;
1726 int sched_rt_handler(struct ctl_table
*table
, int write
,
1727 struct file
*filp
, void __user
*buffer
, size_t *lenp
,
1730 extern unsigned int sysctl_sched_compat_yield
;
1732 #ifdef CONFIG_RT_MUTEXES
1733 extern int rt_mutex_getprio(struct task_struct
*p
);
1734 extern void rt_mutex_setprio(struct task_struct
*p
, int prio
);
1735 extern void rt_mutex_adjust_pi(struct task_struct
*p
);
1737 static inline int rt_mutex_getprio(struct task_struct
*p
)
1739 return p
->normal_prio
;
1741 # define rt_mutex_adjust_pi(p) do { } while (0)
1744 extern void set_user_nice(struct task_struct
*p
, long nice
);
1745 extern int task_prio(const struct task_struct
*p
);
1746 extern int task_nice(const struct task_struct
*p
);
1747 extern int can_nice(const struct task_struct
*p
, const int nice
);
1748 extern int task_curr(const struct task_struct
*p
);
1749 extern int idle_cpu(int cpu
);
1750 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
1751 extern int sched_setscheduler_nocheck(struct task_struct
*, int,
1752 struct sched_param
*);
1753 extern struct task_struct
*idle_task(int cpu
);
1754 extern struct task_struct
*curr_task(int cpu
);
1755 extern void set_curr_task(int cpu
, struct task_struct
*p
);
1760 * The default (Linux) execution domain.
1762 extern struct exec_domain default_exec_domain
;
1764 union thread_union
{
1765 struct thread_info thread_info
;
1766 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1769 #ifndef __HAVE_ARCH_KSTACK_END
1770 static inline int kstack_end(void *addr
)
1772 /* Reliable end of stack detection:
1773 * Some APM bios versions misalign the stack
1775 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1779 extern union thread_union init_thread_union
;
1780 extern struct task_struct init_task
;
1782 extern struct mm_struct init_mm
;
1784 extern struct pid_namespace init_pid_ns
;
1787 * find a task by one of its numerical ids
1789 * find_task_by_pid_type_ns():
1790 * it is the most generic call - it finds a task by all id,
1791 * type and namespace specified
1792 * find_task_by_pid_ns():
1793 * finds a task by its pid in the specified namespace
1794 * find_task_by_vpid():
1795 * finds a task by its virtual pid
1797 * see also find_vpid() etc in include/linux/pid.h
1800 extern struct task_struct
*find_task_by_pid_type_ns(int type
, int pid
,
1801 struct pid_namespace
*ns
);
1803 extern struct task_struct
*find_task_by_vpid(pid_t nr
);
1804 extern struct task_struct
*find_task_by_pid_ns(pid_t nr
,
1805 struct pid_namespace
*ns
);
1807 extern void __set_special_pids(struct pid
*pid
);
1809 /* per-UID process charging. */
1810 extern struct user_struct
* alloc_uid(struct user_namespace
*, uid_t
);
1811 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1813 atomic_inc(&u
->__count
);
1816 extern void free_uid(struct user_struct
*);
1817 extern void release_uids(struct user_namespace
*ns
);
1819 #include <asm/current.h>
1821 extern void do_timer(unsigned long ticks
);
1823 extern int wake_up_state(struct task_struct
*tsk
, unsigned int state
);
1824 extern int wake_up_process(struct task_struct
*tsk
);
1825 extern void wake_up_new_task(struct task_struct
*tsk
,
1826 unsigned long clone_flags
);
1828 extern void kick_process(struct task_struct
*tsk
);
1830 static inline void kick_process(struct task_struct
*tsk
) { }
1832 extern void sched_fork(struct task_struct
*p
, int clone_flags
);
1833 extern void sched_dead(struct task_struct
*p
);
1835 extern void proc_caches_init(void);
1836 extern void flush_signals(struct task_struct
*);
1837 extern void ignore_signals(struct task_struct
*);
1838 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
1839 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
1841 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
1843 unsigned long flags
;
1846 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
1847 ret
= dequeue_signal(tsk
, mask
, info
);
1848 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
1853 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
1855 extern void unblock_all_signals(void);
1856 extern void release_task(struct task_struct
* p
);
1857 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
1858 extern int force_sigsegv(int, struct task_struct
*);
1859 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
1860 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
1861 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
1862 extern int kill_pid_info_as_uid(int, struct siginfo
*, struct pid
*, uid_t
, uid_t
, u32
);
1863 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
1864 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
1865 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
1866 extern int do_notify_parent(struct task_struct
*, int);
1867 extern void force_sig(int, struct task_struct
*);
1868 extern void force_sig_specific(int, struct task_struct
*);
1869 extern int send_sig(int, struct task_struct
*, int);
1870 extern void zap_other_threads(struct task_struct
*p
);
1871 extern struct sigqueue
*sigqueue_alloc(void);
1872 extern void sigqueue_free(struct sigqueue
*);
1873 extern int send_sigqueue(struct sigqueue
*, struct task_struct
*, int group
);
1874 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
1875 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
1877 static inline int kill_cad_pid(int sig
, int priv
)
1879 return kill_pid(cad_pid
, sig
, priv
);
1882 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1883 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1884 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1885 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1887 static inline int is_si_special(const struct siginfo
*info
)
1889 return info
<= SEND_SIG_FORCED
;
1892 /* True if we are on the alternate signal stack. */
1894 static inline int on_sig_stack(unsigned long sp
)
1896 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
1899 static inline int sas_ss_flags(unsigned long sp
)
1901 return (current
->sas_ss_size
== 0 ? SS_DISABLE
1902 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
1906 * Routines for handling mm_structs
1908 extern struct mm_struct
* mm_alloc(void);
1910 /* mmdrop drops the mm and the page tables */
1911 extern void __mmdrop(struct mm_struct
*);
1912 static inline void mmdrop(struct mm_struct
* mm
)
1914 if (unlikely(atomic_dec_and_test(&mm
->mm_count
)))
1918 /* mmput gets rid of the mappings and all user-space */
1919 extern void mmput(struct mm_struct
*);
1920 /* Grab a reference to a task's mm, if it is not already going away */
1921 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
1922 /* Remove the current tasks stale references to the old mm_struct */
1923 extern void mm_release(struct task_struct
*, struct mm_struct
*);
1924 /* Allocate a new mm structure and copy contents from tsk->mm */
1925 extern struct mm_struct
*dup_mm(struct task_struct
*tsk
);
1927 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct
*, struct pt_regs
*);
1928 extern void flush_thread(void);
1929 extern void exit_thread(void);
1931 extern void exit_files(struct task_struct
*);
1932 extern void __cleanup_signal(struct signal_struct
*);
1933 extern void __cleanup_sighand(struct sighand_struct
*);
1935 extern void exit_itimers(struct signal_struct
*);
1936 extern void flush_itimer_signals(void);
1938 extern NORET_TYPE
void do_group_exit(int);
1940 extern void daemonize(const char *, ...);
1941 extern int allow_signal(int);
1942 extern int disallow_signal(int);
1944 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
1945 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
1946 struct task_struct
*fork_idle(int);
1948 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
1949 extern char *get_task_comm(char *to
, struct task_struct
*tsk
);
1952 extern unsigned long wait_task_inactive(struct task_struct
*, long match_state
);
1954 static inline unsigned long wait_task_inactive(struct task_struct
*p
,
1961 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1963 #define for_each_process(p) \
1964 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1966 extern bool is_single_threaded(struct task_struct
*);
1969 * Careful: do_each_thread/while_each_thread is a double loop so
1970 * 'break' will not work as expected - use goto instead.
1972 #define do_each_thread(g, t) \
1973 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1975 #define while_each_thread(g, t) \
1976 while ((t = next_thread(t)) != g)
1978 /* de_thread depends on thread_group_leader not being a pid based check */
1979 #define thread_group_leader(p) (p == p->group_leader)
1981 /* Do to the insanities of de_thread it is possible for a process
1982 * to have the pid of the thread group leader without actually being
1983 * the thread group leader. For iteration through the pids in proc
1984 * all we care about is that we have a task with the appropriate
1985 * pid, we don't actually care if we have the right task.
1987 static inline int has_group_leader_pid(struct task_struct
*p
)
1989 return p
->pid
== p
->tgid
;
1993 int same_thread_group(struct task_struct
*p1
, struct task_struct
*p2
)
1995 return p1
->tgid
== p2
->tgid
;
1998 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
2000 return list_entry(rcu_dereference(p
->thread_group
.next
),
2001 struct task_struct
, thread_group
);
2004 static inline int thread_group_empty(struct task_struct
*p
)
2006 return list_empty(&p
->thread_group
);
2009 #define delay_group_leader(p) \
2010 (thread_group_leader(p) && !thread_group_empty(p))
2013 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2014 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2015 * pins the final release of task.io_context. Also protects ->cpuset and
2016 * ->cgroup.subsys[].
2018 * Nests both inside and outside of read_lock(&tasklist_lock).
2019 * It must not be nested with write_lock_irq(&tasklist_lock),
2020 * neither inside nor outside.
2022 static inline void task_lock(struct task_struct
*p
)
2024 spin_lock(&p
->alloc_lock
);
2027 static inline void task_unlock(struct task_struct
*p
)
2029 spin_unlock(&p
->alloc_lock
);
2032 extern struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
2033 unsigned long *flags
);
2035 static inline void unlock_task_sighand(struct task_struct
*tsk
,
2036 unsigned long *flags
)
2038 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
2041 #ifndef __HAVE_THREAD_FUNCTIONS
2043 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2044 #define task_stack_page(task) ((task)->stack)
2046 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
2048 *task_thread_info(p
) = *task_thread_info(org
);
2049 task_thread_info(p
)->task
= p
;
2052 static inline unsigned long *end_of_stack(struct task_struct
*p
)
2054 return (unsigned long *)(task_thread_info(p
) + 1);
2059 static inline int object_is_on_stack(void *obj
)
2061 void *stack
= task_stack_page(current
);
2063 return (obj
>= stack
) && (obj
< (stack
+ THREAD_SIZE
));
2066 extern void thread_info_cache_init(void);
2068 #ifdef CONFIG_DEBUG_STACK_USAGE
2069 static inline unsigned long stack_not_used(struct task_struct
*p
)
2071 unsigned long *n
= end_of_stack(p
);
2073 do { /* Skip over canary */
2077 return (unsigned long)n
- (unsigned long)end_of_stack(p
);
2081 /* set thread flags in other task's structures
2082 * - see asm/thread_info.h for TIF_xxxx flags available
2084 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2086 set_ti_thread_flag(task_thread_info(tsk
), flag
);
2089 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2091 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2094 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2096 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
2099 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2101 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2104 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2106 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
2109 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
2111 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2114 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
2116 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2119 static inline int test_tsk_need_resched(struct task_struct
*tsk
)
2121 return unlikely(test_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
));
2124 static inline int signal_pending(struct task_struct
*p
)
2126 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
2129 extern int __fatal_signal_pending(struct task_struct
*p
);
2131 static inline int fatal_signal_pending(struct task_struct
*p
)
2133 return signal_pending(p
) && __fatal_signal_pending(p
);
2136 static inline int signal_pending_state(long state
, struct task_struct
*p
)
2138 if (!(state
& (TASK_INTERRUPTIBLE
| TASK_WAKEKILL
)))
2140 if (!signal_pending(p
))
2143 return (state
& TASK_INTERRUPTIBLE
) || __fatal_signal_pending(p
);
2146 static inline int need_resched(void)
2148 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
2152 * cond_resched() and cond_resched_lock(): latency reduction via
2153 * explicit rescheduling in places that are safe. The return
2154 * value indicates whether a reschedule was done in fact.
2155 * cond_resched_lock() will drop the spinlock before scheduling,
2156 * cond_resched_softirq() will enable bhs before scheduling.
2158 extern int _cond_resched(void);
2159 #ifdef CONFIG_PREEMPT_BKL
2160 static inline int cond_resched(void)
2165 static inline int cond_resched(void)
2167 return _cond_resched();
2170 extern int cond_resched_lock(spinlock_t
* lock
);
2171 extern int cond_resched_softirq(void);
2172 static inline int cond_resched_bkl(void)
2174 return _cond_resched();
2178 * Does a critical section need to be broken due to another
2179 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2180 * but a general need for low latency)
2182 static inline int spin_needbreak(spinlock_t
*lock
)
2184 #ifdef CONFIG_PREEMPT
2185 return spin_is_contended(lock
);
2192 * Thread group CPU time accounting.
2195 extern int thread_group_cputime_alloc(struct task_struct
*);
2196 extern void thread_group_cputime(struct task_struct
*, struct task_cputime
*);
2198 static inline void thread_group_cputime_init(struct signal_struct
*sig
)
2200 sig
->cputime
.totals
= NULL
;
2203 static inline int thread_group_cputime_clone_thread(struct task_struct
*curr
)
2205 if (curr
->signal
->cputime
.totals
)
2207 return thread_group_cputime_alloc(curr
);
2210 static inline void thread_group_cputime_free(struct signal_struct
*sig
)
2212 free_percpu(sig
->cputime
.totals
);
2216 * Reevaluate whether the task has signals pending delivery.
2217 * Wake the task if so.
2218 * This is required every time the blocked sigset_t changes.
2219 * callers must hold sighand->siglock.
2221 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
2222 extern void recalc_sigpending(void);
2224 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
2227 * Wrappers for p->thread_info->cpu access. No-op on UP.
2231 static inline unsigned int task_cpu(const struct task_struct
*p
)
2233 return task_thread_info(p
)->cpu
;
2236 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
2240 static inline unsigned int task_cpu(const struct task_struct
*p
)
2245 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
2249 #endif /* CONFIG_SMP */
2251 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
2253 #ifdef CONFIG_TRACING
2255 __trace_special(void *__tr
, void *__data
,
2256 unsigned long arg1
, unsigned long arg2
, unsigned long arg3
);
2259 __trace_special(void *__tr
, void *__data
,
2260 unsigned long arg1
, unsigned long arg2
, unsigned long arg3
)
2265 extern long sched_setaffinity(pid_t pid
, const struct cpumask
*new_mask
);
2266 extern long sched_getaffinity(pid_t pid
, struct cpumask
*mask
);
2268 extern void normalize_rt_tasks(void);
2270 #ifdef CONFIG_GROUP_SCHED
2272 extern struct task_group init_task_group
;
2273 #ifdef CONFIG_USER_SCHED
2274 extern struct task_group root_task_group
;
2275 extern void set_tg_uid(struct user_struct
*user
);
2278 extern struct task_group
*sched_create_group(struct task_group
*parent
);
2279 extern void sched_destroy_group(struct task_group
*tg
);
2280 extern void sched_move_task(struct task_struct
*tsk
);
2281 #ifdef CONFIG_FAIR_GROUP_SCHED
2282 extern int sched_group_set_shares(struct task_group
*tg
, unsigned long shares
);
2283 extern unsigned long sched_group_shares(struct task_group
*tg
);
2285 #ifdef CONFIG_RT_GROUP_SCHED
2286 extern int sched_group_set_rt_runtime(struct task_group
*tg
,
2287 long rt_runtime_us
);
2288 extern long sched_group_rt_runtime(struct task_group
*tg
);
2289 extern int sched_group_set_rt_period(struct task_group
*tg
,
2291 extern long sched_group_rt_period(struct task_group
*tg
);
2295 #ifdef CONFIG_TASK_XACCT
2296 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2298 tsk
->ioac
.rchar
+= amt
;
2301 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2303 tsk
->ioac
.wchar
+= amt
;
2306 static inline void inc_syscr(struct task_struct
*tsk
)
2311 static inline void inc_syscw(struct task_struct
*tsk
)
2316 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2320 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2324 static inline void inc_syscr(struct task_struct
*tsk
)
2328 static inline void inc_syscw(struct task_struct
*tsk
)
2333 #ifndef TASK_SIZE_OF
2334 #define TASK_SIZE_OF(tsk) TASK_SIZE
2337 #ifdef CONFIG_MM_OWNER
2338 extern void mm_update_next_owner(struct mm_struct
*mm
);
2339 extern void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
);
2341 static inline void mm_update_next_owner(struct mm_struct
*mm
)
2345 static inline void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
)
2348 #endif /* CONFIG_MM_OWNER */
2350 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2352 #endif /* __KERNEL__ */