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/perf_counter.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/rtmutex.h>
83 #include <linux/time.h>
84 #include <linux/param.h>
85 #include <linux/resource.h>
86 #include <linux/timer.h>
87 #include <linux/hrtimer.h>
88 #include <linux/task_io_accounting.h>
89 #include <linux/kobject.h>
90 #include <linux/latencytop.h>
91 #include <linux/cred.h>
93 #include <asm/processor.h>
97 struct futex_pi_state
;
98 struct robust_list_head
;
103 * List of flags we want to share for kernel threads,
104 * if only because they are not used by them anyway.
106 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
109 * These are the constant used to fake the fixed-point load-average
110 * counting. Some notes:
111 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
112 * a load-average precision of 10 bits integer + 11 bits fractional
113 * - if you want to count load-averages more often, you need more
114 * precision, or rounding will get you. With 2-second counting freq,
115 * the EXP_n values would be 1981, 2034 and 2043 if still using only
118 extern unsigned long avenrun
[]; /* Load averages */
120 #define FSHIFT 11 /* nr of bits of precision */
121 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
122 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
123 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
124 #define EXP_5 2014 /* 1/exp(5sec/5min) */
125 #define EXP_15 2037 /* 1/exp(5sec/15min) */
127 #define CALC_LOAD(load,exp,n) \
129 load += n*(FIXED_1-exp); \
132 extern unsigned long total_forks
;
133 extern int nr_threads
;
134 DECLARE_PER_CPU(unsigned long, process_counts
);
135 extern int nr_processes(void);
136 extern unsigned long nr_running(void);
137 extern unsigned long nr_uninterruptible(void);
138 extern unsigned long nr_active(void);
139 extern unsigned long nr_iowait(void);
144 #ifdef CONFIG_SCHED_DEBUG
145 extern void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
);
146 extern void proc_sched_set_task(struct task_struct
*p
);
148 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
);
151 proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
154 static inline void proc_sched_set_task(struct task_struct
*p
)
158 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
163 extern unsigned long long time_sync_thresh
;
166 * Task state bitmask. NOTE! These bits are also
167 * encoded in fs/proc/array.c: get_task_state().
169 * We have two separate sets of flags: task->state
170 * is about runnability, while task->exit_state are
171 * about the task exiting. Confusing, but this way
172 * modifying one set can't modify the other one by
175 #define TASK_RUNNING 0
176 #define TASK_INTERRUPTIBLE 1
177 #define TASK_UNINTERRUPTIBLE 2
178 #define __TASK_STOPPED 4
179 #define __TASK_TRACED 8
180 /* in tsk->exit_state */
181 #define EXIT_ZOMBIE 16
183 /* in tsk->state again */
185 #define TASK_WAKEKILL 128
187 /* Convenience macros for the sake of set_task_state */
188 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
189 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
190 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
192 /* Convenience macros for the sake of wake_up */
193 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
194 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
196 /* get_task_state() */
197 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
198 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
201 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
202 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
203 #define task_is_stopped_or_traced(task) \
204 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
205 #define task_contributes_to_load(task) \
206 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
208 #define __set_task_state(tsk, state_value) \
209 do { (tsk)->state = (state_value); } while (0)
210 #define set_task_state(tsk, state_value) \
211 set_mb((tsk)->state, (state_value))
214 * set_current_state() includes a barrier so that the write of current->state
215 * is correctly serialised wrt the caller's subsequent test of whether to
218 * set_current_state(TASK_UNINTERRUPTIBLE);
219 * if (do_i_need_to_sleep())
222 * If the caller does not need such serialisation then use __set_current_state()
224 #define __set_current_state(state_value) \
225 do { current->state = (state_value); } while (0)
226 #define set_current_state(state_value) \
227 set_mb(current->state, (state_value))
229 /* Task command name length */
230 #define TASK_COMM_LEN 16
232 #include <linux/spinlock.h>
235 * This serializes "schedule()" and also protects
236 * the run-queue from deletions/modifications (but
237 * _adding_ to the beginning of the run-queue has
240 extern rwlock_t tasklist_lock
;
241 extern spinlock_t mmlist_lock
;
245 extern void sched_init(void);
246 extern void sched_init_smp(void);
247 extern asmlinkage
void schedule_tail(struct task_struct
*prev
);
248 extern void init_idle(struct task_struct
*idle
, int cpu
);
249 extern void init_idle_bootup_task(struct task_struct
*idle
);
251 extern int runqueue_is_locked(void);
252 extern void task_rq_unlock_wait(struct task_struct
*p
);
254 extern cpumask_var_t nohz_cpu_mask
;
255 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
256 extern int select_nohz_load_balancer(int cpu
);
258 static inline int select_nohz_load_balancer(int cpu
)
265 * Only dump TASK_* tasks. (0 for all tasks)
267 extern void show_state_filter(unsigned long state_filter
);
269 static inline void show_state(void)
271 show_state_filter(0);
274 extern void show_regs(struct pt_regs
*);
277 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
278 * task), SP is the stack pointer of the first frame that should be shown in the back
279 * trace (or NULL if the entire call-chain of the task should be shown).
281 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
283 void io_schedule(void);
284 long io_schedule_timeout(long timeout
);
286 extern void cpu_init (void);
287 extern void trap_init(void);
288 extern void update_process_times(int user
);
289 extern void scheduler_tick(void);
291 extern void sched_show_task(struct task_struct
*p
);
293 #ifdef CONFIG_DETECT_SOFTLOCKUP
294 extern void softlockup_tick(void);
295 extern void touch_softlockup_watchdog(void);
296 extern void touch_all_softlockup_watchdogs(void);
297 extern unsigned int softlockup_panic
;
298 extern unsigned long sysctl_hung_task_check_count
;
299 extern unsigned long sysctl_hung_task_timeout_secs
;
300 extern unsigned long sysctl_hung_task_warnings
;
301 extern int softlockup_thresh
;
303 static inline void softlockup_tick(void)
306 static inline void spawn_softlockup_task(void)
309 static inline void touch_softlockup_watchdog(void)
312 static inline void touch_all_softlockup_watchdogs(void)
318 /* Attach to any functions which should be ignored in wchan output. */
319 #define __sched __attribute__((__section__(".sched.text")))
321 /* Linker adds these: start and end of __sched functions */
322 extern char __sched_text_start
[], __sched_text_end
[];
324 /* Is this address in the __sched functions? */
325 extern int in_sched_functions(unsigned long addr
);
327 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
328 extern signed long schedule_timeout(signed long timeout
);
329 extern signed long schedule_timeout_interruptible(signed long timeout
);
330 extern signed long schedule_timeout_killable(signed long timeout
);
331 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
332 asmlinkage
void schedule(void);
335 struct user_namespace
;
337 /* Maximum number of active map areas.. This is a random (large) number */
338 #define DEFAULT_MAX_MAP_COUNT 65536
340 extern int sysctl_max_map_count
;
342 #include <linux/aio.h>
345 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
346 unsigned long, unsigned long);
348 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
349 unsigned long len
, unsigned long pgoff
,
350 unsigned long flags
);
351 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
352 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
354 #if USE_SPLIT_PTLOCKS
356 * The mm counters are not protected by its page_table_lock,
357 * so must be incremented atomically.
359 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
360 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
361 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
362 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
363 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
365 #else /* !USE_SPLIT_PTLOCKS */
367 * The mm counters are protected by its page_table_lock,
368 * so can be incremented directly.
370 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
371 #define get_mm_counter(mm, member) ((mm)->_##member)
372 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
373 #define inc_mm_counter(mm, member) (mm)->_##member++
374 #define dec_mm_counter(mm, member) (mm)->_##member--
376 #endif /* !USE_SPLIT_PTLOCKS */
378 #define get_mm_rss(mm) \
379 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
380 #define update_hiwater_rss(mm) do { \
381 unsigned long _rss = get_mm_rss(mm); \
382 if ((mm)->hiwater_rss < _rss) \
383 (mm)->hiwater_rss = _rss; \
385 #define update_hiwater_vm(mm) do { \
386 if ((mm)->hiwater_vm < (mm)->total_vm) \
387 (mm)->hiwater_vm = (mm)->total_vm; \
390 #define get_mm_hiwater_rss(mm) max((mm)->hiwater_rss, get_mm_rss(mm))
391 #define get_mm_hiwater_vm(mm) max((mm)->hiwater_vm, (mm)->total_vm)
393 extern void set_dumpable(struct mm_struct
*mm
, int value
);
394 extern int get_dumpable(struct mm_struct
*mm
);
398 #define MMF_DUMPABLE 0 /* core dump is permitted */
399 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
400 #define MMF_DUMPABLE_BITS 2
402 /* coredump filter bits */
403 #define MMF_DUMP_ANON_PRIVATE 2
404 #define MMF_DUMP_ANON_SHARED 3
405 #define MMF_DUMP_MAPPED_PRIVATE 4
406 #define MMF_DUMP_MAPPED_SHARED 5
407 #define MMF_DUMP_ELF_HEADERS 6
408 #define MMF_DUMP_HUGETLB_PRIVATE 7
409 #define MMF_DUMP_HUGETLB_SHARED 8
410 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
411 #define MMF_DUMP_FILTER_BITS 7
412 #define MMF_DUMP_FILTER_MASK \
413 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
414 #define MMF_DUMP_FILTER_DEFAULT \
415 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
416 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
418 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
419 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
421 # define MMF_DUMP_MASK_DEFAULT_ELF 0
424 struct sighand_struct
{
426 struct k_sigaction action
[_NSIG
];
428 wait_queue_head_t signalfd_wqh
;
431 struct pacct_struct
{
434 unsigned long ac_mem
;
435 cputime_t ac_utime
, ac_stime
;
436 unsigned long ac_minflt
, ac_majflt
;
440 * struct task_cputime - collected CPU time counts
441 * @utime: time spent in user mode, in &cputime_t units
442 * @stime: time spent in kernel mode, in &cputime_t units
443 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
445 * This structure groups together three kinds of CPU time that are
446 * tracked for threads and thread groups. Most things considering
447 * CPU time want to group these counts together and treat all three
448 * of them in parallel.
450 struct task_cputime
{
453 unsigned long long sum_exec_runtime
;
455 /* Alternate field names when used to cache expirations. */
456 #define prof_exp stime
457 #define virt_exp utime
458 #define sched_exp sum_exec_runtime
461 * struct thread_group_cputime - thread group interval timer counts
462 * @totals: thread group interval timers; substructure for
463 * uniprocessor kernel, per-cpu for SMP kernel.
465 * This structure contains the version of task_cputime, above, that is
466 * used for thread group CPU clock calculations.
468 struct thread_group_cputime
{
469 struct task_cputime
*totals
;
473 * NOTE! "signal_struct" does not have it's own
474 * locking, because a shared signal_struct always
475 * implies a shared sighand_struct, so locking
476 * sighand_struct is always a proper superset of
477 * the locking of signal_struct.
479 struct signal_struct
{
483 wait_queue_head_t wait_chldexit
; /* for wait4() */
485 /* current thread group signal load-balancing target: */
486 struct task_struct
*curr_target
;
488 /* shared signal handling: */
489 struct sigpending shared_pending
;
491 /* thread group exit support */
494 * - notify group_exit_task when ->count is equal to notify_count
495 * - everyone except group_exit_task is stopped during signal delivery
496 * of fatal signals, group_exit_task processes the signal.
499 struct task_struct
*group_exit_task
;
501 /* thread group stop support, overloads group_exit_code too */
502 int group_stop_count
;
503 unsigned int flags
; /* see SIGNAL_* flags below */
505 /* POSIX.1b Interval Timers */
506 struct list_head posix_timers
;
508 /* ITIMER_REAL timer for the process */
509 struct hrtimer real_timer
;
510 struct pid
*leader_pid
;
511 ktime_t it_real_incr
;
513 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
514 cputime_t it_prof_expires
, it_virt_expires
;
515 cputime_t it_prof_incr
, it_virt_incr
;
518 * Thread group totals for process CPU clocks.
519 * See thread_group_cputime(), et al, for details.
521 struct thread_group_cputime cputime
;
523 /* Earliest-expiration cache. */
524 struct task_cputime cputime_expires
;
526 struct list_head cpu_timers
[3];
528 /* job control IDs */
531 * pgrp and session fields are deprecated.
532 * use the task_session_Xnr and task_pgrp_Xnr routines below
536 pid_t pgrp __deprecated
;
540 struct pid
*tty_old_pgrp
;
543 pid_t session __deprecated
;
547 /* boolean value for session group leader */
550 struct tty_struct
*tty
; /* NULL if no tty */
553 * Cumulative resource counters for dead threads in the group,
554 * and for reaped dead child processes forked by this group.
555 * Live threads maintain their own counters and add to these
556 * in __exit_signal, except for the group leader.
558 cputime_t cutime
, cstime
;
561 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
562 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
563 unsigned long inblock
, oublock
, cinblock
, coublock
;
564 struct task_io_accounting ioac
;
567 * We don't bother to synchronize most readers of this at all,
568 * because there is no reader checking a limit that actually needs
569 * to get both rlim_cur and rlim_max atomically, and either one
570 * alone is a single word that can safely be read normally.
571 * getrlimit/setrlimit use task_lock(current->group_leader) to
572 * protect this instead of the siglock, because they really
573 * have no need to disable irqs.
575 struct rlimit rlim
[RLIM_NLIMITS
];
577 #ifdef CONFIG_BSD_PROCESS_ACCT
578 struct pacct_struct pacct
; /* per-process accounting information */
580 #ifdef CONFIG_TASKSTATS
581 struct taskstats
*stats
;
585 struct tty_audit_buf
*tty_audit_buf
;
589 /* Context switch must be unlocked if interrupts are to be enabled */
590 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
591 # define __ARCH_WANT_UNLOCKED_CTXSW
595 * Bits in flags field of signal_struct.
597 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
598 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
599 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
600 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
602 * Pending notifications to parent.
604 #define SIGNAL_CLD_STOPPED 0x00000010
605 #define SIGNAL_CLD_CONTINUED 0x00000020
606 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
608 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
610 /* If true, all threads except ->group_exit_task have pending SIGKILL */
611 static inline int signal_group_exit(const struct signal_struct
*sig
)
613 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
614 (sig
->group_exit_task
!= NULL
);
618 * Some day this will be a full-fledged user tracking system..
621 atomic_t __count
; /* reference count */
622 atomic_t processes
; /* How many processes does this user have? */
623 atomic_t files
; /* How many open files does this user have? */
624 atomic_t sigpending
; /* How many pending signals does this user have? */
625 #ifdef CONFIG_INOTIFY_USER
626 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
627 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
630 atomic_t epoll_devs
; /* The number of epoll descriptors currently open */
631 atomic_t epoll_watches
; /* The number of file descriptors currently watched */
633 #ifdef CONFIG_POSIX_MQUEUE
634 /* protected by mq_lock */
635 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
637 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
640 struct key
*uid_keyring
; /* UID specific keyring */
641 struct key
*session_keyring
; /* UID's default session keyring */
644 /* Hash table maintenance information */
645 struct hlist_node uidhash_node
;
647 struct user_namespace
*user_ns
;
649 #ifdef CONFIG_USER_SCHED
650 struct task_group
*tg
;
653 struct work_struct work
;
658 extern int uids_sysfs_init(void);
660 extern struct user_struct
*find_user(uid_t
);
662 extern struct user_struct root_user
;
663 #define INIT_USER (&root_user)
666 struct backing_dev_info
;
667 struct reclaim_state
;
669 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
671 /* cumulative counters */
672 unsigned long pcount
; /* # of times run on this cpu */
673 unsigned long long run_delay
; /* time spent waiting on a runqueue */
676 unsigned long long last_arrival
,/* when we last ran on a cpu */
677 last_queued
; /* when we were last queued to run */
678 #ifdef CONFIG_SCHEDSTATS
680 unsigned int bkl_count
;
683 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
685 #ifdef CONFIG_TASK_DELAY_ACCT
686 struct task_delay_info
{
688 unsigned int flags
; /* Private per-task flags */
690 /* For each stat XXX, add following, aligned appropriately
692 * struct timespec XXX_start, XXX_end;
696 * Atomicity of updates to XXX_delay, XXX_count protected by
697 * single lock above (split into XXX_lock if contention is an issue).
701 * XXX_count is incremented on every XXX operation, the delay
702 * associated with the operation is added to XXX_delay.
703 * XXX_delay contains the accumulated delay time in nanoseconds.
705 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
706 u64 blkio_delay
; /* wait for sync block io completion */
707 u64 swapin_delay
; /* wait for swapin block io completion */
708 u32 blkio_count
; /* total count of the number of sync block */
709 /* io operations performed */
710 u32 swapin_count
; /* total count of the number of swapin block */
711 /* io operations performed */
713 struct timespec freepages_start
, freepages_end
;
714 u64 freepages_delay
; /* wait for memory reclaim */
715 u32 freepages_count
; /* total count of memory reclaim */
717 #endif /* CONFIG_TASK_DELAY_ACCT */
719 static inline int sched_info_on(void)
721 #ifdef CONFIG_SCHEDSTATS
723 #elif defined(CONFIG_TASK_DELAY_ACCT)
724 extern int delayacct_on
;
739 * sched-domains (multiprocessor balancing) declarations:
743 * Increase resolution of nice-level calculations:
745 #define SCHED_LOAD_SHIFT 10
746 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
748 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
751 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
752 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
753 #define SD_BALANCE_EXEC 4 /* Balance on exec */
754 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
755 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
756 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
757 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
758 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
759 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
760 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
761 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
762 #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
764 enum powersavings_balance_level
{
765 POWERSAVINGS_BALANCE_NONE
= 0, /* No power saving load balance */
766 POWERSAVINGS_BALANCE_BASIC
, /* Fill one thread/core/package
767 * first for long running threads
769 POWERSAVINGS_BALANCE_WAKEUP
, /* Also bias task wakeups to semi-idle
770 * cpu package for power savings
772 MAX_POWERSAVINGS_BALANCE_LEVELS
775 extern int sched_mc_power_savings
, sched_smt_power_savings
;
777 static inline int sd_balance_for_mc_power(void)
779 if (sched_smt_power_savings
)
780 return SD_POWERSAVINGS_BALANCE
;
785 static inline int sd_balance_for_package_power(void)
787 if (sched_mc_power_savings
| sched_smt_power_savings
)
788 return SD_POWERSAVINGS_BALANCE
;
794 * Optimise SD flags for power savings:
795 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
796 * Keep default SD flags if sched_{smt,mc}_power_saving=0
799 static inline int sd_power_saving_flags(void)
801 if (sched_mc_power_savings
| sched_smt_power_savings
)
802 return SD_BALANCE_NEWIDLE
;
808 struct sched_group
*next
; /* Must be a circular list */
811 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
812 * single CPU. This is read only (except for setup, hotplug CPU).
813 * Note : Never change cpu_power without recompute its reciprocal
815 unsigned int __cpu_power
;
817 * reciprocal value of cpu_power to avoid expensive divides
818 * (see include/linux/reciprocal_div.h)
820 u32 reciprocal_cpu_power
;
822 unsigned long cpumask
[];
825 static inline struct cpumask
*sched_group_cpus(struct sched_group
*sg
)
827 return to_cpumask(sg
->cpumask
);
830 enum sched_domain_level
{
840 struct sched_domain_attr
{
841 int relax_domain_level
;
844 #define SD_ATTR_INIT (struct sched_domain_attr) { \
845 .relax_domain_level = -1, \
848 struct sched_domain
{
849 /* These fields must be setup */
850 struct sched_domain
*parent
; /* top domain must be null terminated */
851 struct sched_domain
*child
; /* bottom domain must be null terminated */
852 struct sched_group
*groups
; /* the balancing groups of the domain */
853 unsigned long min_interval
; /* Minimum balance interval ms */
854 unsigned long max_interval
; /* Maximum balance interval ms */
855 unsigned int busy_factor
; /* less balancing by factor if busy */
856 unsigned int imbalance_pct
; /* No balance until over watermark */
857 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
858 unsigned int busy_idx
;
859 unsigned int idle_idx
;
860 unsigned int newidle_idx
;
861 unsigned int wake_idx
;
862 unsigned int forkexec_idx
;
863 int flags
; /* See SD_* */
864 enum sched_domain_level level
;
866 /* Runtime fields. */
867 unsigned long last_balance
; /* init to jiffies. units in jiffies */
868 unsigned int balance_interval
; /* initialise to 1. units in ms. */
869 unsigned int nr_balance_failed
; /* initialise to 0 */
873 #ifdef CONFIG_SCHEDSTATS
874 /* load_balance() stats */
875 unsigned int lb_count
[CPU_MAX_IDLE_TYPES
];
876 unsigned int lb_failed
[CPU_MAX_IDLE_TYPES
];
877 unsigned int lb_balanced
[CPU_MAX_IDLE_TYPES
];
878 unsigned int lb_imbalance
[CPU_MAX_IDLE_TYPES
];
879 unsigned int lb_gained
[CPU_MAX_IDLE_TYPES
];
880 unsigned int lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
881 unsigned int lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
882 unsigned int lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
884 /* Active load balancing */
885 unsigned int alb_count
;
886 unsigned int alb_failed
;
887 unsigned int alb_pushed
;
889 /* SD_BALANCE_EXEC stats */
890 unsigned int sbe_count
;
891 unsigned int sbe_balanced
;
892 unsigned int sbe_pushed
;
894 /* SD_BALANCE_FORK stats */
895 unsigned int sbf_count
;
896 unsigned int sbf_balanced
;
897 unsigned int sbf_pushed
;
899 /* try_to_wake_up() stats */
900 unsigned int ttwu_wake_remote
;
901 unsigned int ttwu_move_affine
;
902 unsigned int ttwu_move_balance
;
904 #ifdef CONFIG_SCHED_DEBUG
908 /* span of all CPUs in this domain */
909 unsigned long span
[];
912 static inline struct cpumask
*sched_domain_span(struct sched_domain
*sd
)
914 return to_cpumask(sd
->span
);
917 extern void partition_sched_domains(int ndoms_new
, struct cpumask
*doms_new
,
918 struct sched_domain_attr
*dattr_new
);
920 /* Test a flag in parent sched domain */
921 static inline int test_sd_parent(struct sched_domain
*sd
, int flag
)
923 if (sd
->parent
&& (sd
->parent
->flags
& flag
))
929 #else /* CONFIG_SMP */
931 struct sched_domain_attr
;
934 partition_sched_domains(int ndoms_new
, struct cpumask
*doms_new
,
935 struct sched_domain_attr
*dattr_new
)
938 #endif /* !CONFIG_SMP */
940 struct io_context
; /* See blkdev.h */
943 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
944 extern void prefetch_stack(struct task_struct
*t
);
946 static inline void prefetch_stack(struct task_struct
*t
) { }
949 struct audit_context
; /* See audit.c */
951 struct pipe_inode_info
;
952 struct uts_namespace
;
958 const struct sched_class
*next
;
960 void (*enqueue_task
) (struct rq
*rq
, struct task_struct
*p
, int wakeup
);
961 void (*dequeue_task
) (struct rq
*rq
, struct task_struct
*p
, int sleep
);
962 void (*yield_task
) (struct rq
*rq
);
964 void (*check_preempt_curr
) (struct rq
*rq
, struct task_struct
*p
, int sync
);
966 struct task_struct
* (*pick_next_task
) (struct rq
*rq
);
967 void (*put_prev_task
) (struct rq
*rq
, struct task_struct
*p
);
970 int (*select_task_rq
)(struct task_struct
*p
, int sync
);
972 unsigned long (*load_balance
) (struct rq
*this_rq
, int this_cpu
,
973 struct rq
*busiest
, unsigned long max_load_move
,
974 struct sched_domain
*sd
, enum cpu_idle_type idle
,
975 int *all_pinned
, int *this_best_prio
);
977 int (*move_one_task
) (struct rq
*this_rq
, int this_cpu
,
978 struct rq
*busiest
, struct sched_domain
*sd
,
979 enum cpu_idle_type idle
);
980 void (*pre_schedule
) (struct rq
*this_rq
, struct task_struct
*task
);
981 void (*post_schedule
) (struct rq
*this_rq
);
982 void (*task_wake_up
) (struct rq
*this_rq
, struct task_struct
*task
);
984 void (*set_cpus_allowed
)(struct task_struct
*p
,
985 const struct cpumask
*newmask
);
987 void (*rq_online
)(struct rq
*rq
);
988 void (*rq_offline
)(struct rq
*rq
);
991 void (*set_curr_task
) (struct rq
*rq
);
992 void (*task_tick
) (struct rq
*rq
, struct task_struct
*p
, int queued
);
993 void (*task_new
) (struct rq
*rq
, struct task_struct
*p
);
995 void (*switched_from
) (struct rq
*this_rq
, struct task_struct
*task
,
997 void (*switched_to
) (struct rq
*this_rq
, struct task_struct
*task
,
999 void (*prio_changed
) (struct rq
*this_rq
, struct task_struct
*task
,
1000 int oldprio
, int running
);
1002 #ifdef CONFIG_FAIR_GROUP_SCHED
1003 void (*moved_group
) (struct task_struct
*p
);
1007 struct load_weight
{
1008 unsigned long weight
, inv_weight
;
1012 * CFS stats for a schedulable entity (task, task-group etc)
1014 * Current field usage histogram:
1021 struct sched_entity
{
1022 struct load_weight load
; /* for load-balancing */
1023 struct rb_node run_node
;
1024 struct list_head group_node
;
1028 u64 sum_exec_runtime
;
1030 u64 prev_sum_exec_runtime
;
1037 #ifdef CONFIG_SCHEDSTATS
1045 s64 sum_sleep_runtime
;
1052 u64 nr_migrations_cold
;
1053 u64 nr_failed_migrations_affine
;
1054 u64 nr_failed_migrations_running
;
1055 u64 nr_failed_migrations_hot
;
1056 u64 nr_forced_migrations
;
1057 u64 nr_forced2_migrations
;
1060 u64 nr_wakeups_sync
;
1061 u64 nr_wakeups_migrate
;
1062 u64 nr_wakeups_local
;
1063 u64 nr_wakeups_remote
;
1064 u64 nr_wakeups_affine
;
1065 u64 nr_wakeups_affine_attempts
;
1066 u64 nr_wakeups_passive
;
1067 u64 nr_wakeups_idle
;
1070 #ifdef CONFIG_FAIR_GROUP_SCHED
1071 struct sched_entity
*parent
;
1072 /* rq on which this entity is (to be) queued: */
1073 struct cfs_rq
*cfs_rq
;
1074 /* rq "owned" by this entity/group: */
1075 struct cfs_rq
*my_q
;
1079 struct sched_rt_entity
{
1080 struct list_head run_list
;
1081 unsigned long timeout
;
1082 unsigned int time_slice
;
1083 int nr_cpus_allowed
;
1085 struct sched_rt_entity
*back
;
1086 #ifdef CONFIG_RT_GROUP_SCHED
1087 struct sched_rt_entity
*parent
;
1088 /* rq on which this entity is (to be) queued: */
1089 struct rt_rq
*rt_rq
;
1090 /* rq "owned" by this entity/group: */
1095 struct task_struct
{
1096 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
1099 unsigned int flags
; /* per process flags, defined below */
1100 unsigned int ptrace
;
1102 int lock_depth
; /* BKL lock depth */
1105 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1110 int prio
, static_prio
, normal_prio
;
1111 unsigned int rt_priority
;
1112 const struct sched_class
*sched_class
;
1113 struct sched_entity se
;
1114 struct sched_rt_entity rt
;
1116 #ifdef CONFIG_PREEMPT_NOTIFIERS
1117 /* list of struct preempt_notifier: */
1118 struct hlist_head preempt_notifiers
;
1122 * fpu_counter contains the number of consecutive context switches
1123 * that the FPU is used. If this is over a threshold, the lazy fpu
1124 * saving becomes unlazy to save the trap. This is an unsigned char
1125 * so that after 256 times the counter wraps and the behavior turns
1126 * lazy again; this to deal with bursty apps that only use FPU for
1129 unsigned char fpu_counter
;
1130 s8 oomkilladj
; /* OOM kill score adjustment (bit shift). */
1131 #ifdef CONFIG_BLK_DEV_IO_TRACE
1132 unsigned int btrace_seq
;
1135 unsigned int policy
;
1136 cpumask_t cpus_allowed
;
1138 #ifdef CONFIG_PREEMPT_RCU
1139 int rcu_read_lock_nesting
;
1140 int rcu_flipctr_idx
;
1141 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1143 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1144 struct sched_info sched_info
;
1147 struct list_head tasks
;
1149 struct mm_struct
*mm
, *active_mm
;
1152 struct linux_binfmt
*binfmt
;
1154 int exit_code
, exit_signal
;
1155 int pdeath_signal
; /* The signal sent when the parent dies */
1157 unsigned int personality
;
1158 unsigned did_exec
:1;
1162 #ifdef CONFIG_CC_STACKPROTECTOR
1163 /* Canary value for the -fstack-protector gcc feature */
1164 unsigned long stack_canary
;
1167 * pointers to (original) parent process, youngest child, younger sibling,
1168 * older sibling, respectively. (p->father can be replaced with
1169 * p->real_parent->pid)
1171 struct task_struct
*real_parent
; /* real parent process */
1172 struct task_struct
*parent
; /* recipient of SIGCHLD, wait4() reports */
1174 * children/sibling forms the list of my natural children
1176 struct list_head children
; /* list of my children */
1177 struct list_head sibling
; /* linkage in my parent's children list */
1178 struct task_struct
*group_leader
; /* threadgroup leader */
1181 * ptraced is the list of tasks this task is using ptrace on.
1182 * This includes both natural children and PTRACE_ATTACH targets.
1183 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1185 struct list_head ptraced
;
1186 struct list_head ptrace_entry
;
1188 #ifdef CONFIG_X86_PTRACE_BTS
1190 * This is the tracer handle for the ptrace BTS extension.
1191 * This field actually belongs to the ptracer task.
1193 struct bts_tracer
*bts
;
1195 * The buffer to hold the BTS data.
1199 #endif /* CONFIG_X86_PTRACE_BTS */
1201 /* PID/PID hash table linkage. */
1202 struct pid_link pids
[PIDTYPE_MAX
];
1203 struct list_head thread_group
;
1205 struct completion
*vfork_done
; /* for vfork() */
1206 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
1207 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
1209 cputime_t utime
, stime
, utimescaled
, stimescaled
;
1211 cputime_t prev_utime
, prev_stime
;
1212 unsigned long nvcsw
, nivcsw
; /* context switch counts */
1213 struct timespec start_time
; /* monotonic time */
1214 struct timespec real_start_time
; /* boot based time */
1215 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1216 unsigned long min_flt
, maj_flt
;
1218 struct task_cputime cputime_expires
;
1219 struct list_head cpu_timers
[3];
1221 /* process credentials */
1222 const struct cred
*real_cred
; /* objective and real subjective task
1223 * credentials (COW) */
1224 const struct cred
*cred
; /* effective (overridable) subjective task
1225 * credentials (COW) */
1226 struct mutex cred_exec_mutex
; /* execve vs ptrace cred calculation mutex */
1228 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
1229 - access with [gs]et_task_comm (which lock
1230 it with task_lock())
1231 - initialized normally by flush_old_exec */
1232 /* file system info */
1233 int link_count
, total_link_count
;
1234 #ifdef CONFIG_SYSVIPC
1236 struct sysv_sem sysvsem
;
1238 #ifdef CONFIG_DETECT_SOFTLOCKUP
1239 /* hung task detection */
1240 unsigned long last_switch_timestamp
;
1241 unsigned long last_switch_count
;
1243 /* CPU-specific state of this task */
1244 struct thread_struct thread
;
1245 /* filesystem information */
1246 struct fs_struct
*fs
;
1247 /* open file information */
1248 struct files_struct
*files
;
1250 struct nsproxy
*nsproxy
;
1251 /* signal handlers */
1252 struct signal_struct
*signal
;
1253 struct sighand_struct
*sighand
;
1255 sigset_t blocked
, real_blocked
;
1256 sigset_t saved_sigmask
; /* restored if set_restore_sigmask() was used */
1257 struct sigpending pending
;
1259 unsigned long sas_ss_sp
;
1261 int (*notifier
)(void *priv
);
1262 void *notifier_data
;
1263 sigset_t
*notifier_mask
;
1264 struct audit_context
*audit_context
;
1265 #ifdef CONFIG_AUDITSYSCALL
1267 unsigned int sessionid
;
1271 /* Thread group tracking */
1274 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1275 spinlock_t alloc_lock
;
1277 /* Protection of the PI data structures: */
1280 #ifdef CONFIG_RT_MUTEXES
1281 /* PI waiters blocked on a rt_mutex held by this task */
1282 struct plist_head pi_waiters
;
1283 /* Deadlock detection and priority inheritance handling */
1284 struct rt_mutex_waiter
*pi_blocked_on
;
1287 #ifdef CONFIG_DEBUG_MUTEXES
1288 /* mutex deadlock detection */
1289 struct mutex_waiter
*blocked_on
;
1291 #ifdef CONFIG_TRACE_IRQFLAGS
1292 unsigned int irq_events
;
1293 int hardirqs_enabled
;
1294 unsigned long hardirq_enable_ip
;
1295 unsigned int hardirq_enable_event
;
1296 unsigned long hardirq_disable_ip
;
1297 unsigned int hardirq_disable_event
;
1298 int softirqs_enabled
;
1299 unsigned long softirq_disable_ip
;
1300 unsigned int softirq_disable_event
;
1301 unsigned long softirq_enable_ip
;
1302 unsigned int softirq_enable_event
;
1303 int hardirq_context
;
1304 int softirq_context
;
1306 #ifdef CONFIG_LOCKDEP
1307 # define MAX_LOCK_DEPTH 48UL
1310 unsigned int lockdep_recursion
;
1311 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1314 /* journalling filesystem info */
1317 /* stacked block device info */
1318 struct bio
*bio_list
, **bio_tail
;
1321 struct reclaim_state
*reclaim_state
;
1323 struct backing_dev_info
*backing_dev_info
;
1325 struct io_context
*io_context
;
1327 unsigned long ptrace_message
;
1328 siginfo_t
*last_siginfo
; /* For ptrace use. */
1329 struct task_io_accounting ioac
;
1330 #if defined(CONFIG_TASK_XACCT)
1331 u64 acct_rss_mem1
; /* accumulated rss usage */
1332 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1333 cputime_t acct_timexpd
; /* stime + utime since last update */
1335 #ifdef CONFIG_CPUSETS
1336 nodemask_t mems_allowed
;
1337 int cpuset_mems_generation
;
1338 int cpuset_mem_spread_rotor
;
1340 #ifdef CONFIG_CGROUPS
1341 /* Control Group info protected by css_set_lock */
1342 struct css_set
*cgroups
;
1343 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1344 struct list_head cg_list
;
1347 struct robust_list_head __user
*robust_list
;
1348 #ifdef CONFIG_COMPAT
1349 struct compat_robust_list_head __user
*compat_robust_list
;
1351 struct list_head pi_state_list
;
1352 struct futex_pi_state
*pi_state_cache
;
1354 struct perf_counter_context perf_counter_ctx
;
1356 struct mempolicy
*mempolicy
;
1359 atomic_t fs_excl
; /* holding fs exclusive resources */
1360 struct rcu_head rcu
;
1363 * cache last used pipe for splice
1365 struct pipe_inode_info
*splice_pipe
;
1366 #ifdef CONFIG_TASK_DELAY_ACCT
1367 struct task_delay_info
*delays
;
1369 #ifdef CONFIG_FAULT_INJECTION
1372 struct prop_local_single dirties
;
1373 #ifdef CONFIG_LATENCYTOP
1374 int latency_record_count
;
1375 struct latency_record latency_record
[LT_SAVECOUNT
];
1378 * time slack values; these are used to round up poll() and
1379 * select() etc timeout values. These are in nanoseconds.
1381 unsigned long timer_slack_ns
;
1382 unsigned long default_timer_slack_ns
;
1384 struct list_head
*scm_work_list
;
1385 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1386 /* Index of current stored adress in ret_stack */
1388 /* Stack of return addresses for return function tracing */
1389 struct ftrace_ret_stack
*ret_stack
;
1391 * Number of functions that haven't been traced
1392 * because of depth overrun.
1394 atomic_t trace_overrun
;
1395 /* Pause for the tracing */
1396 atomic_t tracing_graph_pause
;
1398 #ifdef CONFIG_TRACING
1399 /* state flags for use by tracers */
1400 unsigned long trace
;
1405 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1406 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1407 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1408 * values are inverted: lower p->prio value means higher priority.
1410 * The MAX_USER_RT_PRIO value allows the actual maximum
1411 * RT priority to be separate from the value exported to
1412 * user-space. This allows kernel threads to set their
1413 * priority to a value higher than any user task. Note:
1414 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1417 #define MAX_USER_RT_PRIO 100
1418 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1420 #define MAX_PRIO (MAX_RT_PRIO + 40)
1421 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1423 static inline int rt_prio(int prio
)
1425 if (unlikely(prio
< MAX_RT_PRIO
))
1430 static inline int rt_task(struct task_struct
*p
)
1432 return rt_prio(p
->prio
);
1435 static inline void set_task_session(struct task_struct
*tsk
, pid_t session
)
1437 tsk
->signal
->__session
= session
;
1440 static inline void set_task_pgrp(struct task_struct
*tsk
, pid_t pgrp
)
1442 tsk
->signal
->__pgrp
= pgrp
;
1445 static inline struct pid
*task_pid(struct task_struct
*task
)
1447 return task
->pids
[PIDTYPE_PID
].pid
;
1450 static inline struct pid
*task_tgid(struct task_struct
*task
)
1452 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1455 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1457 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1460 static inline struct pid
*task_session(struct task_struct
*task
)
1462 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1465 struct pid_namespace
;
1468 * the helpers to get the task's different pids as they are seen
1469 * from various namespaces
1471 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1472 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1474 * task_xid_nr_ns() : id seen from the ns specified;
1476 * set_task_vxid() : assigns a virtual id to a task;
1478 * see also pid_nr() etc in include/linux/pid.h
1481 static inline pid_t
task_pid_nr(struct task_struct
*tsk
)
1486 pid_t
task_pid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1488 static inline pid_t
task_pid_vnr(struct task_struct
*tsk
)
1490 return pid_vnr(task_pid(tsk
));
1494 static inline pid_t
task_tgid_nr(struct task_struct
*tsk
)
1499 pid_t
task_tgid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1501 static inline pid_t
task_tgid_vnr(struct task_struct
*tsk
)
1503 return pid_vnr(task_tgid(tsk
));
1507 static inline pid_t
task_pgrp_nr(struct task_struct
*tsk
)
1509 return tsk
->signal
->__pgrp
;
1512 pid_t
task_pgrp_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1514 static inline pid_t
task_pgrp_vnr(struct task_struct
*tsk
)
1516 return pid_vnr(task_pgrp(tsk
));
1520 static inline pid_t
task_session_nr(struct task_struct
*tsk
)
1522 return tsk
->signal
->__session
;
1525 pid_t
task_session_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1527 static inline pid_t
task_session_vnr(struct task_struct
*tsk
)
1529 return pid_vnr(task_session(tsk
));
1534 * pid_alive - check that a task structure is not stale
1535 * @p: Task structure to be checked.
1537 * Test if a process is not yet dead (at most zombie state)
1538 * If pid_alive fails, then pointers within the task structure
1539 * can be stale and must not be dereferenced.
1541 static inline int pid_alive(struct task_struct
*p
)
1543 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1547 * is_global_init - check if a task structure is init
1548 * @tsk: Task structure to be checked.
1550 * Check if a task structure is the first user space task the kernel created.
1552 static inline int is_global_init(struct task_struct
*tsk
)
1554 return tsk
->pid
== 1;
1558 * is_container_init:
1559 * check whether in the task is init in its own pid namespace.
1561 extern int is_container_init(struct task_struct
*tsk
);
1563 extern struct pid
*cad_pid
;
1565 extern void free_task(struct task_struct
*tsk
);
1566 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1568 extern void __put_task_struct(struct task_struct
*t
);
1570 static inline void put_task_struct(struct task_struct
*t
)
1572 if (atomic_dec_and_test(&t
->usage
))
1573 __put_task_struct(t
);
1576 extern cputime_t
task_utime(struct task_struct
*p
);
1577 extern cputime_t
task_stime(struct task_struct
*p
);
1578 extern cputime_t
task_gtime(struct task_struct
*p
);
1583 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1584 /* Not implemented yet, only for 486*/
1585 #define PF_STARTING 0x00000002 /* being created */
1586 #define PF_EXITING 0x00000004 /* getting shut down */
1587 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1588 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1589 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1590 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1591 #define PF_DUMPCORE 0x00000200 /* dumped core */
1592 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1593 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1594 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1595 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1596 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1597 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1598 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1599 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1600 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1601 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1602 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1603 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1604 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1605 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1606 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1607 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1608 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1609 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1610 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1611 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1614 * Only the _current_ task can read/write to tsk->flags, but other
1615 * tasks can access tsk->flags in readonly mode for example
1616 * with tsk_used_math (like during threaded core dumping).
1617 * There is however an exception to this rule during ptrace
1618 * or during fork: the ptracer task is allowed to write to the
1619 * child->flags of its traced child (same goes for fork, the parent
1620 * can write to the child->flags), because we're guaranteed the
1621 * child is not running and in turn not changing child->flags
1622 * at the same time the parent does it.
1624 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1625 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1626 #define clear_used_math() clear_stopped_child_used_math(current)
1627 #define set_used_math() set_stopped_child_used_math(current)
1628 #define conditional_stopped_child_used_math(condition, child) \
1629 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1630 #define conditional_used_math(condition) \
1631 conditional_stopped_child_used_math(condition, current)
1632 #define copy_to_stopped_child_used_math(child) \
1633 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1634 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1635 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1636 #define used_math() tsk_used_math(current)
1639 extern int set_cpus_allowed_ptr(struct task_struct
*p
,
1640 const struct cpumask
*new_mask
);
1642 static inline int set_cpus_allowed_ptr(struct task_struct
*p
,
1643 const struct cpumask
*new_mask
)
1645 if (!cpumask_test_cpu(0, new_mask
))
1650 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1652 return set_cpus_allowed_ptr(p
, &new_mask
);
1655 extern unsigned long long sched_clock(void);
1657 extern void sched_clock_init(void);
1658 extern u64
sched_clock_cpu(int cpu
);
1660 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1661 static inline void sched_clock_tick(void)
1665 static inline void sched_clock_idle_sleep_event(void)
1669 static inline void sched_clock_idle_wakeup_event(u64 delta_ns
)
1673 extern void sched_clock_tick(void);
1674 extern void sched_clock_idle_sleep_event(void);
1675 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1679 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1680 * clock constructed from sched_clock():
1682 extern unsigned long long cpu_clock(int cpu
);
1684 extern unsigned long long
1685 task_sched_runtime(struct task_struct
*task
);
1686 extern unsigned long long thread_group_sched_runtime(struct task_struct
*task
);
1688 /* sched_exec is called by processes performing an exec */
1690 extern void sched_exec(void);
1692 #define sched_exec() {}
1695 extern void sched_clock_idle_sleep_event(void);
1696 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1698 #ifdef CONFIG_HOTPLUG_CPU
1699 extern void idle_task_exit(void);
1701 static inline void idle_task_exit(void) {}
1704 extern void sched_idle_next(void);
1706 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1707 extern void wake_up_idle_cpu(int cpu
);
1709 static inline void wake_up_idle_cpu(int cpu
) { }
1712 extern unsigned int sysctl_sched_latency
;
1713 extern unsigned int sysctl_sched_min_granularity
;
1714 extern unsigned int sysctl_sched_wakeup_granularity
;
1715 extern unsigned int sysctl_sched_shares_ratelimit
;
1716 extern unsigned int sysctl_sched_shares_thresh
;
1717 #ifdef CONFIG_SCHED_DEBUG
1718 extern unsigned int sysctl_sched_child_runs_first
;
1719 extern unsigned int sysctl_sched_features
;
1720 extern unsigned int sysctl_sched_migration_cost
;
1721 extern unsigned int sysctl_sched_nr_migrate
;
1723 int sched_nr_latency_handler(struct ctl_table
*table
, int write
,
1724 struct file
*file
, void __user
*buffer
, size_t *length
,
1727 extern unsigned int sysctl_sched_rt_period
;
1728 extern int sysctl_sched_rt_runtime
;
1730 int sched_rt_handler(struct ctl_table
*table
, int write
,
1731 struct file
*filp
, void __user
*buffer
, size_t *lenp
,
1734 extern unsigned int sysctl_sched_compat_yield
;
1736 #ifdef CONFIG_RT_MUTEXES
1737 extern int rt_mutex_getprio(struct task_struct
*p
);
1738 extern void rt_mutex_setprio(struct task_struct
*p
, int prio
);
1739 extern void rt_mutex_adjust_pi(struct task_struct
*p
);
1741 static inline int rt_mutex_getprio(struct task_struct
*p
)
1743 return p
->normal_prio
;
1745 # define rt_mutex_adjust_pi(p) do { } while (0)
1748 extern void set_user_nice(struct task_struct
*p
, long nice
);
1749 extern int task_prio(const struct task_struct
*p
);
1750 extern int task_nice(const struct task_struct
*p
);
1751 extern int can_nice(const struct task_struct
*p
, const int nice
);
1752 extern int task_curr(const struct task_struct
*p
);
1753 extern int idle_cpu(int cpu
);
1754 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
1755 extern int sched_setscheduler_nocheck(struct task_struct
*, int,
1756 struct sched_param
*);
1757 extern struct task_struct
*idle_task(int cpu
);
1758 extern struct task_struct
*curr_task(int cpu
);
1759 extern void set_curr_task(int cpu
, struct task_struct
*p
);
1764 * The default (Linux) execution domain.
1766 extern struct exec_domain default_exec_domain
;
1768 union thread_union
{
1769 struct thread_info thread_info
;
1770 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1773 #ifndef __HAVE_ARCH_KSTACK_END
1774 static inline int kstack_end(void *addr
)
1776 /* Reliable end of stack detection:
1777 * Some APM bios versions misalign the stack
1779 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1783 extern union thread_union init_thread_union
;
1784 extern struct task_struct init_task
;
1786 extern struct mm_struct init_mm
;
1788 extern struct pid_namespace init_pid_ns
;
1791 * find a task by one of its numerical ids
1793 * find_task_by_pid_type_ns():
1794 * it is the most generic call - it finds a task by all id,
1795 * type and namespace specified
1796 * find_task_by_pid_ns():
1797 * finds a task by its pid in the specified namespace
1798 * find_task_by_vpid():
1799 * finds a task by its virtual pid
1801 * see also find_vpid() etc in include/linux/pid.h
1804 extern struct task_struct
*find_task_by_pid_type_ns(int type
, int pid
,
1805 struct pid_namespace
*ns
);
1807 extern struct task_struct
*find_task_by_vpid(pid_t nr
);
1808 extern struct task_struct
*find_task_by_pid_ns(pid_t nr
,
1809 struct pid_namespace
*ns
);
1811 extern void __set_special_pids(struct pid
*pid
);
1813 /* per-UID process charging. */
1814 extern struct user_struct
* alloc_uid(struct user_namespace
*, uid_t
);
1815 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1817 atomic_inc(&u
->__count
);
1820 extern void free_uid(struct user_struct
*);
1821 extern void release_uids(struct user_namespace
*ns
);
1823 #include <asm/current.h>
1825 extern void do_timer(unsigned long ticks
);
1827 extern int wake_up_state(struct task_struct
*tsk
, unsigned int state
);
1828 extern int wake_up_process(struct task_struct
*tsk
);
1829 extern void wake_up_new_task(struct task_struct
*tsk
,
1830 unsigned long clone_flags
);
1832 extern void kick_process(struct task_struct
*tsk
);
1834 static inline void kick_process(struct task_struct
*tsk
) { }
1836 extern void sched_fork(struct task_struct
*p
, int clone_flags
);
1837 extern void sched_dead(struct task_struct
*p
);
1839 extern void proc_caches_init(void);
1840 extern void flush_signals(struct task_struct
*);
1841 extern void ignore_signals(struct task_struct
*);
1842 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
1843 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
1845 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
1847 unsigned long flags
;
1850 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
1851 ret
= dequeue_signal(tsk
, mask
, info
);
1852 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
1857 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
1859 extern void unblock_all_signals(void);
1860 extern void release_task(struct task_struct
* p
);
1861 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
1862 extern int force_sigsegv(int, struct task_struct
*);
1863 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
1864 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
1865 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
1866 extern int kill_pid_info_as_uid(int, struct siginfo
*, struct pid
*, uid_t
, uid_t
, u32
);
1867 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
1868 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
1869 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
1870 extern int do_notify_parent(struct task_struct
*, int);
1871 extern void force_sig(int, struct task_struct
*);
1872 extern void force_sig_specific(int, struct task_struct
*);
1873 extern int send_sig(int, struct task_struct
*, int);
1874 extern void zap_other_threads(struct task_struct
*p
);
1875 extern struct sigqueue
*sigqueue_alloc(void);
1876 extern void sigqueue_free(struct sigqueue
*);
1877 extern int send_sigqueue(struct sigqueue
*, struct task_struct
*, int group
);
1878 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
1879 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
1881 static inline int kill_cad_pid(int sig
, int priv
)
1883 return kill_pid(cad_pid
, sig
, priv
);
1886 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1887 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1888 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1889 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1891 static inline int is_si_special(const struct siginfo
*info
)
1893 return info
<= SEND_SIG_FORCED
;
1896 /* True if we are on the alternate signal stack. */
1898 static inline int on_sig_stack(unsigned long sp
)
1900 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
1903 static inline int sas_ss_flags(unsigned long sp
)
1905 return (current
->sas_ss_size
== 0 ? SS_DISABLE
1906 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
1910 * Routines for handling mm_structs
1912 extern struct mm_struct
* mm_alloc(void);
1914 /* mmdrop drops the mm and the page tables */
1915 extern void __mmdrop(struct mm_struct
*);
1916 static inline void mmdrop(struct mm_struct
* mm
)
1918 if (unlikely(atomic_dec_and_test(&mm
->mm_count
)))
1922 /* mmput gets rid of the mappings and all user-space */
1923 extern void mmput(struct mm_struct
*);
1924 /* Grab a reference to a task's mm, if it is not already going away */
1925 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
1926 /* Remove the current tasks stale references to the old mm_struct */
1927 extern void mm_release(struct task_struct
*, struct mm_struct
*);
1928 /* Allocate a new mm structure and copy contents from tsk->mm */
1929 extern struct mm_struct
*dup_mm(struct task_struct
*tsk
);
1931 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct
*, struct pt_regs
*);
1932 extern void flush_thread(void);
1933 extern void exit_thread(void);
1935 extern void exit_files(struct task_struct
*);
1936 extern void __cleanup_signal(struct signal_struct
*);
1937 extern void __cleanup_sighand(struct sighand_struct
*);
1939 extern void exit_itimers(struct signal_struct
*);
1940 extern void flush_itimer_signals(void);
1942 extern NORET_TYPE
void do_group_exit(int);
1944 extern void daemonize(const char *, ...);
1945 extern int allow_signal(int);
1946 extern int disallow_signal(int);
1948 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
1949 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
1950 struct task_struct
*fork_idle(int);
1952 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
1953 extern char *get_task_comm(char *to
, struct task_struct
*tsk
);
1956 extern unsigned long wait_task_inactive(struct task_struct
*, long match_state
);
1958 static inline unsigned long wait_task_inactive(struct task_struct
*p
,
1965 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1967 #define for_each_process(p) \
1968 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1970 extern bool is_single_threaded(struct task_struct
*);
1973 * Careful: do_each_thread/while_each_thread is a double loop so
1974 * 'break' will not work as expected - use goto instead.
1976 #define do_each_thread(g, t) \
1977 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1979 #define while_each_thread(g, t) \
1980 while ((t = next_thread(t)) != g)
1982 /* de_thread depends on thread_group_leader not being a pid based check */
1983 #define thread_group_leader(p) (p == p->group_leader)
1985 /* Do to the insanities of de_thread it is possible for a process
1986 * to have the pid of the thread group leader without actually being
1987 * the thread group leader. For iteration through the pids in proc
1988 * all we care about is that we have a task with the appropriate
1989 * pid, we don't actually care if we have the right task.
1991 static inline int has_group_leader_pid(struct task_struct
*p
)
1993 return p
->pid
== p
->tgid
;
1997 int same_thread_group(struct task_struct
*p1
, struct task_struct
*p2
)
1999 return p1
->tgid
== p2
->tgid
;
2002 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
2004 return list_entry(rcu_dereference(p
->thread_group
.next
),
2005 struct task_struct
, thread_group
);
2008 static inline int thread_group_empty(struct task_struct
*p
)
2010 return list_empty(&p
->thread_group
);
2013 #define delay_group_leader(p) \
2014 (thread_group_leader(p) && !thread_group_empty(p))
2017 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2018 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2019 * pins the final release of task.io_context. Also protects ->cpuset and
2020 * ->cgroup.subsys[].
2022 * Nests both inside and outside of read_lock(&tasklist_lock).
2023 * It must not be nested with write_lock_irq(&tasklist_lock),
2024 * neither inside nor outside.
2026 static inline void task_lock(struct task_struct
*p
)
2028 spin_lock(&p
->alloc_lock
);
2031 static inline void task_unlock(struct task_struct
*p
)
2033 spin_unlock(&p
->alloc_lock
);
2036 extern struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
2037 unsigned long *flags
);
2039 static inline void unlock_task_sighand(struct task_struct
*tsk
,
2040 unsigned long *flags
)
2042 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
2045 #ifndef __HAVE_THREAD_FUNCTIONS
2047 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2048 #define task_stack_page(task) ((task)->stack)
2050 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
2052 *task_thread_info(p
) = *task_thread_info(org
);
2053 task_thread_info(p
)->task
= p
;
2056 static inline unsigned long *end_of_stack(struct task_struct
*p
)
2058 return (unsigned long *)(task_thread_info(p
) + 1);
2063 static inline int object_is_on_stack(void *obj
)
2065 void *stack
= task_stack_page(current
);
2067 return (obj
>= stack
) && (obj
< (stack
+ THREAD_SIZE
));
2070 extern void thread_info_cache_init(void);
2072 /* set thread flags in other task's structures
2073 * - see asm/thread_info.h for TIF_xxxx flags available
2075 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2077 set_ti_thread_flag(task_thread_info(tsk
), flag
);
2080 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2082 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2085 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2087 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
2090 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2092 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2095 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2097 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
2100 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
2102 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2105 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
2107 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2110 static inline int test_tsk_need_resched(struct task_struct
*tsk
)
2112 return unlikely(test_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
));
2115 static inline int signal_pending(struct task_struct
*p
)
2117 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
2120 extern int __fatal_signal_pending(struct task_struct
*p
);
2122 static inline int fatal_signal_pending(struct task_struct
*p
)
2124 return signal_pending(p
) && __fatal_signal_pending(p
);
2127 static inline int signal_pending_state(long state
, struct task_struct
*p
)
2129 if (!(state
& (TASK_INTERRUPTIBLE
| TASK_WAKEKILL
)))
2131 if (!signal_pending(p
))
2134 return (state
& TASK_INTERRUPTIBLE
) || __fatal_signal_pending(p
);
2137 static inline int need_resched(void)
2139 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
2143 * cond_resched() and cond_resched_lock(): latency reduction via
2144 * explicit rescheduling in places that are safe. The return
2145 * value indicates whether a reschedule was done in fact.
2146 * cond_resched_lock() will drop the spinlock before scheduling,
2147 * cond_resched_softirq() will enable bhs before scheduling.
2149 extern int _cond_resched(void);
2150 #ifdef CONFIG_PREEMPT_BKL
2151 static inline int cond_resched(void)
2156 static inline int cond_resched(void)
2158 return _cond_resched();
2161 extern int cond_resched_lock(spinlock_t
* lock
);
2162 extern int cond_resched_softirq(void);
2163 static inline int cond_resched_bkl(void)
2165 return _cond_resched();
2169 * Does a critical section need to be broken due to another
2170 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2171 * but a general need for low latency)
2173 static inline int spin_needbreak(spinlock_t
*lock
)
2175 #ifdef CONFIG_PREEMPT
2176 return spin_is_contended(lock
);
2183 * Thread group CPU time accounting.
2186 extern int thread_group_cputime_alloc(struct task_struct
*);
2187 extern void thread_group_cputime(struct task_struct
*, struct task_cputime
*);
2189 static inline void thread_group_cputime_init(struct signal_struct
*sig
)
2191 sig
->cputime
.totals
= NULL
;
2194 static inline int thread_group_cputime_clone_thread(struct task_struct
*curr
)
2196 if (curr
->signal
->cputime
.totals
)
2198 return thread_group_cputime_alloc(curr
);
2201 static inline void thread_group_cputime_free(struct signal_struct
*sig
)
2203 free_percpu(sig
->cputime
.totals
);
2207 * Reevaluate whether the task has signals pending delivery.
2208 * Wake the task if so.
2209 * This is required every time the blocked sigset_t changes.
2210 * callers must hold sighand->siglock.
2212 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
2213 extern void recalc_sigpending(void);
2215 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
2218 * Wrappers for p->thread_info->cpu access. No-op on UP.
2222 static inline unsigned int task_cpu(const struct task_struct
*p
)
2224 return task_thread_info(p
)->cpu
;
2227 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
2231 static inline unsigned int task_cpu(const struct task_struct
*p
)
2236 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
2240 #endif /* CONFIG_SMP */
2242 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
2244 #ifdef CONFIG_TRACING
2246 __trace_special(void *__tr
, void *__data
,
2247 unsigned long arg1
, unsigned long arg2
, unsigned long arg3
);
2250 __trace_special(void *__tr
, void *__data
,
2251 unsigned long arg1
, unsigned long arg2
, unsigned long arg3
)
2256 extern long sched_setaffinity(pid_t pid
, const struct cpumask
*new_mask
);
2257 extern long sched_getaffinity(pid_t pid
, struct cpumask
*mask
);
2259 extern void normalize_rt_tasks(void);
2261 #ifdef CONFIG_GROUP_SCHED
2263 extern struct task_group init_task_group
;
2264 #ifdef CONFIG_USER_SCHED
2265 extern struct task_group root_task_group
;
2266 extern void set_tg_uid(struct user_struct
*user
);
2269 extern struct task_group
*sched_create_group(struct task_group
*parent
);
2270 extern void sched_destroy_group(struct task_group
*tg
);
2271 extern void sched_move_task(struct task_struct
*tsk
);
2272 #ifdef CONFIG_FAIR_GROUP_SCHED
2273 extern int sched_group_set_shares(struct task_group
*tg
, unsigned long shares
);
2274 extern unsigned long sched_group_shares(struct task_group
*tg
);
2276 #ifdef CONFIG_RT_GROUP_SCHED
2277 extern int sched_group_set_rt_runtime(struct task_group
*tg
,
2278 long rt_runtime_us
);
2279 extern long sched_group_rt_runtime(struct task_group
*tg
);
2280 extern int sched_group_set_rt_period(struct task_group
*tg
,
2282 extern long sched_group_rt_period(struct task_group
*tg
);
2286 #ifdef CONFIG_TASK_XACCT
2287 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2289 tsk
->ioac
.rchar
+= amt
;
2292 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2294 tsk
->ioac
.wchar
+= amt
;
2297 static inline void inc_syscr(struct task_struct
*tsk
)
2302 static inline void inc_syscw(struct task_struct
*tsk
)
2307 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2311 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2315 static inline void inc_syscr(struct task_struct
*tsk
)
2319 static inline void inc_syscw(struct task_struct
*tsk
)
2324 #ifndef TASK_SIZE_OF
2325 #define TASK_SIZE_OF(tsk) TASK_SIZE
2329 * Call the function if the target task is executing on a CPU right now:
2331 extern void task_oncpu_function_call(struct task_struct
*p
,
2332 void (*func
) (void *info
), void *info
);
2335 #ifdef CONFIG_MM_OWNER
2336 extern void mm_update_next_owner(struct mm_struct
*mm
);
2337 extern void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
);
2339 static inline void mm_update_next_owner(struct mm_struct
*mm
)
2343 static inline void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
)
2346 #endif /* CONFIG_MM_OWNER */
2348 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2350 #endif /* __KERNEL__ */