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>
91 #include <asm/processor.h>
95 struct futex_pi_state
;
96 struct robust_list_head
;
100 * List of flags we want to share for kernel threads,
101 * if only because they are not used by them anyway.
103 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
106 * These are the constant used to fake the fixed-point load-average
107 * counting. Some notes:
108 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
109 * a load-average precision of 10 bits integer + 11 bits fractional
110 * - if you want to count load-averages more often, you need more
111 * precision, or rounding will get you. With 2-second counting freq,
112 * the EXP_n values would be 1981, 2034 and 2043 if still using only
115 extern unsigned long avenrun
[]; /* Load averages */
117 #define FSHIFT 11 /* nr of bits of precision */
118 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
119 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
120 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
121 #define EXP_5 2014 /* 1/exp(5sec/5min) */
122 #define EXP_15 2037 /* 1/exp(5sec/15min) */
124 #define CALC_LOAD(load,exp,n) \
126 load += n*(FIXED_1-exp); \
129 extern unsigned long total_forks
;
130 extern int nr_threads
;
131 DECLARE_PER_CPU(unsigned long, process_counts
);
132 extern int nr_processes(void);
133 extern unsigned long nr_running(void);
134 extern unsigned long nr_uninterruptible(void);
135 extern unsigned long nr_active(void);
136 extern unsigned long nr_iowait(void);
141 #ifdef CONFIG_SCHED_DEBUG
142 extern void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
);
143 extern void proc_sched_set_task(struct task_struct
*p
);
145 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
);
148 proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
151 static inline void proc_sched_set_task(struct task_struct
*p
)
155 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
160 extern unsigned long long time_sync_thresh
;
163 * Task state bitmask. NOTE! These bits are also
164 * encoded in fs/proc/array.c: get_task_state().
166 * We have two separate sets of flags: task->state
167 * is about runnability, while task->exit_state are
168 * about the task exiting. Confusing, but this way
169 * modifying one set can't modify the other one by
172 #define TASK_RUNNING 0
173 #define TASK_INTERRUPTIBLE 1
174 #define TASK_UNINTERRUPTIBLE 2
175 #define __TASK_STOPPED 4
176 #define __TASK_TRACED 8
177 /* in tsk->exit_state */
178 #define EXIT_ZOMBIE 16
180 /* in tsk->state again */
182 #define TASK_WAKEKILL 128
184 /* Convenience macros for the sake of set_task_state */
185 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
186 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
187 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
189 /* Convenience macros for the sake of wake_up */
190 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
191 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
193 /* get_task_state() */
194 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
195 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
198 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
199 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
200 #define task_is_stopped_or_traced(task) \
201 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
202 #define task_contributes_to_load(task) \
203 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
205 #define __set_task_state(tsk, state_value) \
206 do { (tsk)->state = (state_value); } while (0)
207 #define set_task_state(tsk, state_value) \
208 set_mb((tsk)->state, (state_value))
211 * set_current_state() includes a barrier so that the write of current->state
212 * is correctly serialised wrt the caller's subsequent test of whether to
215 * set_current_state(TASK_UNINTERRUPTIBLE);
216 * if (do_i_need_to_sleep())
219 * If the caller does not need such serialisation then use __set_current_state()
221 #define __set_current_state(state_value) \
222 do { current->state = (state_value); } while (0)
223 #define set_current_state(state_value) \
224 set_mb(current->state, (state_value))
226 /* Task command name length */
227 #define TASK_COMM_LEN 16
229 #include <linux/spinlock.h>
232 * This serializes "schedule()" and also protects
233 * the run-queue from deletions/modifications (but
234 * _adding_ to the beginning of the run-queue has
237 extern rwlock_t tasklist_lock
;
238 extern spinlock_t mmlist_lock
;
242 extern void sched_init(void);
243 extern void sched_init_smp(void);
244 extern asmlinkage
void schedule_tail(struct task_struct
*prev
);
245 extern void init_idle(struct task_struct
*idle
, int cpu
);
246 extern void init_idle_bootup_task(struct task_struct
*idle
);
248 extern int runqueue_is_locked(void);
250 extern cpumask_t nohz_cpu_mask
;
251 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
252 extern int select_nohz_load_balancer(int cpu
);
254 static inline int select_nohz_load_balancer(int cpu
)
260 extern unsigned long rt_needs_cpu(int cpu
);
263 * Only dump TASK_* tasks. (0 for all tasks)
265 extern void show_state_filter(unsigned long state_filter
);
267 static inline void show_state(void)
269 show_state_filter(0);
272 extern void show_regs(struct pt_regs
*);
275 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
276 * task), SP is the stack pointer of the first frame that should be shown in the back
277 * trace (or NULL if the entire call-chain of the task should be shown).
279 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
281 void io_schedule(void);
282 long io_schedule_timeout(long timeout
);
284 extern void cpu_init (void);
285 extern void trap_init(void);
286 extern void account_process_tick(struct task_struct
*task
, int user
);
287 extern void update_process_times(int user
);
288 extern void scheduler_tick(void);
289 extern void hrtick_resched(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 spawn_softlockup_task(void);
296 extern void touch_softlockup_watchdog(void);
297 extern void touch_all_softlockup_watchdogs(void);
298 extern unsigned long softlockup_thresh
;
299 extern unsigned long sysctl_hung_task_check_count
;
300 extern unsigned long sysctl_hung_task_timeout_secs
;
301 extern unsigned long sysctl_hung_task_warnings
;
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 NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
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 /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
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 /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
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 extern void set_dumpable(struct mm_struct
*mm
, int value
);
391 extern int get_dumpable(struct mm_struct
*mm
);
395 #define MMF_DUMPABLE 0 /* core dump is permitted */
396 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
397 #define MMF_DUMPABLE_BITS 2
399 /* coredump filter bits */
400 #define MMF_DUMP_ANON_PRIVATE 2
401 #define MMF_DUMP_ANON_SHARED 3
402 #define MMF_DUMP_MAPPED_PRIVATE 4
403 #define MMF_DUMP_MAPPED_SHARED 5
404 #define MMF_DUMP_ELF_HEADERS 6
405 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
406 #define MMF_DUMP_FILTER_BITS 5
407 #define MMF_DUMP_FILTER_MASK \
408 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
409 #define MMF_DUMP_FILTER_DEFAULT \
410 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
412 struct sighand_struct
{
414 struct k_sigaction action
[_NSIG
];
416 wait_queue_head_t signalfd_wqh
;
419 struct pacct_struct
{
422 unsigned long ac_mem
;
423 cputime_t ac_utime
, ac_stime
;
424 unsigned long ac_minflt
, ac_majflt
;
428 * NOTE! "signal_struct" does not have it's own
429 * locking, because a shared signal_struct always
430 * implies a shared sighand_struct, so locking
431 * sighand_struct is always a proper superset of
432 * the locking of signal_struct.
434 struct signal_struct
{
438 wait_queue_head_t wait_chldexit
; /* for wait4() */
440 /* current thread group signal load-balancing target: */
441 struct task_struct
*curr_target
;
443 /* shared signal handling: */
444 struct sigpending shared_pending
;
446 /* thread group exit support */
449 * - notify group_exit_task when ->count is equal to notify_count
450 * - everyone except group_exit_task is stopped during signal delivery
451 * of fatal signals, group_exit_task processes the signal.
453 struct task_struct
*group_exit_task
;
456 /* thread group stop support, overloads group_exit_code too */
457 int group_stop_count
;
458 unsigned int flags
; /* see SIGNAL_* flags below */
460 /* POSIX.1b Interval Timers */
461 struct list_head posix_timers
;
463 /* ITIMER_REAL timer for the process */
464 struct hrtimer real_timer
;
465 struct pid
*leader_pid
;
466 ktime_t it_real_incr
;
468 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
469 cputime_t it_prof_expires
, it_virt_expires
;
470 cputime_t it_prof_incr
, it_virt_incr
;
472 /* job control IDs */
475 * pgrp and session fields are deprecated.
476 * use the task_session_Xnr and task_pgrp_Xnr routines below
480 pid_t pgrp __deprecated
;
484 struct pid
*tty_old_pgrp
;
487 pid_t session __deprecated
;
491 /* boolean value for session group leader */
494 struct tty_struct
*tty
; /* NULL if no tty */
497 * Cumulative resource counters for dead threads in the group,
498 * and for reaped dead child processes forked by this group.
499 * Live threads maintain their own counters and add to these
500 * in __exit_signal, except for the group leader.
502 cputime_t utime
, stime
, cutime
, cstime
;
505 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
506 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
507 unsigned long inblock
, oublock
, cinblock
, coublock
;
510 * Cumulative ns of scheduled CPU time for dead threads in the
511 * group, not including a zombie group leader. (This only differs
512 * from jiffies_to_ns(utime + stime) if sched_clock uses something
513 * other than jiffies.)
515 unsigned long long sum_sched_runtime
;
518 * We don't bother to synchronize most readers of this at all,
519 * because there is no reader checking a limit that actually needs
520 * to get both rlim_cur and rlim_max atomically, and either one
521 * alone is a single word that can safely be read normally.
522 * getrlimit/setrlimit use task_lock(current->group_leader) to
523 * protect this instead of the siglock, because they really
524 * have no need to disable irqs.
526 struct rlimit rlim
[RLIM_NLIMITS
];
528 struct list_head cpu_timers
[3];
530 /* keep the process-shared keyrings here so that they do the right
531 * thing in threads created with CLONE_THREAD */
533 struct key
*session_keyring
; /* keyring inherited over fork */
534 struct key
*process_keyring
; /* keyring private to this process */
536 #ifdef CONFIG_BSD_PROCESS_ACCT
537 struct pacct_struct pacct
; /* per-process accounting information */
539 #ifdef CONFIG_TASKSTATS
540 struct taskstats
*stats
;
544 struct tty_audit_buf
*tty_audit_buf
;
548 /* Context switch must be unlocked if interrupts are to be enabled */
549 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
550 # define __ARCH_WANT_UNLOCKED_CTXSW
554 * Bits in flags field of signal_struct.
556 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
557 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
558 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
559 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
561 * Pending notifications to parent.
563 #define SIGNAL_CLD_STOPPED 0x00000010
564 #define SIGNAL_CLD_CONTINUED 0x00000020
565 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
567 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
569 /* If true, all threads except ->group_exit_task have pending SIGKILL */
570 static inline int signal_group_exit(const struct signal_struct
*sig
)
572 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
573 (sig
->group_exit_task
!= NULL
);
577 * Some day this will be a full-fledged user tracking system..
580 atomic_t __count
; /* reference count */
581 atomic_t processes
; /* How many processes does this user have? */
582 atomic_t files
; /* How many open files does this user have? */
583 atomic_t sigpending
; /* How many pending signals does this user have? */
584 #ifdef CONFIG_INOTIFY_USER
585 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
586 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
588 #ifdef CONFIG_POSIX_MQUEUE
589 /* protected by mq_lock */
590 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
592 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
595 struct key
*uid_keyring
; /* UID specific keyring */
596 struct key
*session_keyring
; /* UID's default session keyring */
599 /* Hash table maintenance information */
600 struct hlist_node uidhash_node
;
603 #ifdef CONFIG_USER_SCHED
604 struct task_group
*tg
;
607 struct work_struct work
;
612 extern int uids_sysfs_init(void);
614 extern struct user_struct
*find_user(uid_t
);
616 extern struct user_struct root_user
;
617 #define INIT_USER (&root_user)
619 struct backing_dev_info
;
620 struct reclaim_state
;
622 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
624 /* cumulative counters */
625 unsigned long pcount
; /* # of times run on this cpu */
626 unsigned long long cpu_time
, /* time spent on the cpu */
627 run_delay
; /* time spent waiting on a runqueue */
630 unsigned long long last_arrival
,/* when we last ran on a cpu */
631 last_queued
; /* when we were last queued to run */
632 #ifdef CONFIG_SCHEDSTATS
634 unsigned int bkl_count
;
637 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
639 #ifdef CONFIG_SCHEDSTATS
640 extern const struct file_operations proc_schedstat_operations
;
641 #endif /* CONFIG_SCHEDSTATS */
643 #ifdef CONFIG_TASK_DELAY_ACCT
644 struct task_delay_info
{
646 unsigned int flags
; /* Private per-task flags */
648 /* For each stat XXX, add following, aligned appropriately
650 * struct timespec XXX_start, XXX_end;
654 * Atomicity of updates to XXX_delay, XXX_count protected by
655 * single lock above (split into XXX_lock if contention is an issue).
659 * XXX_count is incremented on every XXX operation, the delay
660 * associated with the operation is added to XXX_delay.
661 * XXX_delay contains the accumulated delay time in nanoseconds.
663 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
664 u64 blkio_delay
; /* wait for sync block io completion */
665 u64 swapin_delay
; /* wait for swapin block io completion */
666 u32 blkio_count
; /* total count of the number of sync block */
667 /* io operations performed */
668 u32 swapin_count
; /* total count of the number of swapin block */
669 /* io operations performed */
671 #endif /* CONFIG_TASK_DELAY_ACCT */
673 static inline int sched_info_on(void)
675 #ifdef CONFIG_SCHEDSTATS
677 #elif defined(CONFIG_TASK_DELAY_ACCT)
678 extern int delayacct_on
;
693 * sched-domains (multiprocessor balancing) declarations:
697 * Increase resolution of nice-level calculations:
699 #define SCHED_LOAD_SHIFT 10
700 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
702 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
705 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
706 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
707 #define SD_BALANCE_EXEC 4 /* Balance on exec */
708 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
709 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
710 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
711 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
712 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
713 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
714 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
715 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
716 #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
718 #define BALANCE_FOR_MC_POWER \
719 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
721 #define BALANCE_FOR_PKG_POWER \
722 ((sched_mc_power_savings || sched_smt_power_savings) ? \
723 SD_POWERSAVINGS_BALANCE : 0)
725 #define test_sd_parent(sd, flag) ((sd->parent && \
726 (sd->parent->flags & flag)) ? 1 : 0)
730 struct sched_group
*next
; /* Must be a circular list */
734 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
735 * single CPU. This is read only (except for setup, hotplug CPU).
736 * Note : Never change cpu_power without recompute its reciprocal
738 unsigned int __cpu_power
;
740 * reciprocal value of cpu_power to avoid expensive divides
741 * (see include/linux/reciprocal_div.h)
743 u32 reciprocal_cpu_power
;
746 enum sched_domain_level
{
756 struct sched_domain_attr
{
757 int relax_domain_level
;
760 #define SD_ATTR_INIT (struct sched_domain_attr) { \
761 .relax_domain_level = -1, \
764 struct sched_domain
{
765 /* These fields must be setup */
766 struct sched_domain
*parent
; /* top domain must be null terminated */
767 struct sched_domain
*child
; /* bottom domain must be null terminated */
768 struct sched_group
*groups
; /* the balancing groups of the domain */
769 cpumask_t span
; /* span of all CPUs in this domain */
770 unsigned long min_interval
; /* Minimum balance interval ms */
771 unsigned long max_interval
; /* Maximum balance interval ms */
772 unsigned int busy_factor
; /* less balancing by factor if busy */
773 unsigned int imbalance_pct
; /* No balance until over watermark */
774 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
775 unsigned int busy_idx
;
776 unsigned int idle_idx
;
777 unsigned int newidle_idx
;
778 unsigned int wake_idx
;
779 unsigned int forkexec_idx
;
780 int flags
; /* See SD_* */
781 enum sched_domain_level level
;
783 /* Runtime fields. */
784 unsigned long last_balance
; /* init to jiffies. units in jiffies */
785 unsigned int balance_interval
; /* initialise to 1. units in ms. */
786 unsigned int nr_balance_failed
; /* initialise to 0 */
790 #ifdef CONFIG_SCHEDSTATS
791 /* load_balance() stats */
792 unsigned int lb_count
[CPU_MAX_IDLE_TYPES
];
793 unsigned int lb_failed
[CPU_MAX_IDLE_TYPES
];
794 unsigned int lb_balanced
[CPU_MAX_IDLE_TYPES
];
795 unsigned int lb_imbalance
[CPU_MAX_IDLE_TYPES
];
796 unsigned int lb_gained
[CPU_MAX_IDLE_TYPES
];
797 unsigned int lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
798 unsigned int lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
799 unsigned int lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
801 /* Active load balancing */
802 unsigned int alb_count
;
803 unsigned int alb_failed
;
804 unsigned int alb_pushed
;
806 /* SD_BALANCE_EXEC stats */
807 unsigned int sbe_count
;
808 unsigned int sbe_balanced
;
809 unsigned int sbe_pushed
;
811 /* SD_BALANCE_FORK stats */
812 unsigned int sbf_count
;
813 unsigned int sbf_balanced
;
814 unsigned int sbf_pushed
;
816 /* try_to_wake_up() stats */
817 unsigned int ttwu_wake_remote
;
818 unsigned int ttwu_move_affine
;
819 unsigned int ttwu_move_balance
;
823 extern void partition_sched_domains(int ndoms_new
, cpumask_t
*doms_new
,
824 struct sched_domain_attr
*dattr_new
);
825 extern int arch_reinit_sched_domains(void);
827 #else /* CONFIG_SMP */
829 struct sched_domain_attr
;
832 partition_sched_domains(int ndoms_new
, cpumask_t
*doms_new
,
833 struct sched_domain_attr
*dattr_new
)
836 #endif /* !CONFIG_SMP */
838 struct io_context
; /* See blkdev.h */
839 #define NGROUPS_SMALL 32
840 #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
844 gid_t small_block
[NGROUPS_SMALL
];
850 * get_group_info() must be called with the owning task locked (via task_lock())
851 * when task != current. The reason being that the vast majority of callers are
852 * looking at current->group_info, which can not be changed except by the
853 * current task. Changing current->group_info requires the task lock, too.
855 #define get_group_info(group_info) do { \
856 atomic_inc(&(group_info)->usage); \
859 #define put_group_info(group_info) do { \
860 if (atomic_dec_and_test(&(group_info)->usage)) \
861 groups_free(group_info); \
864 extern struct group_info
*groups_alloc(int gidsetsize
);
865 extern void groups_free(struct group_info
*group_info
);
866 extern int set_current_groups(struct group_info
*group_info
);
867 extern int groups_search(struct group_info
*group_info
, gid_t grp
);
868 /* access the groups "array" with this macro */
869 #define GROUP_AT(gi, i) \
870 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
872 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
873 extern void prefetch_stack(struct task_struct
*t
);
875 static inline void prefetch_stack(struct task_struct
*t
) { }
878 struct audit_context
; /* See audit.c */
880 struct pipe_inode_info
;
881 struct uts_namespace
;
887 const struct sched_class
*next
;
889 void (*enqueue_task
) (struct rq
*rq
, struct task_struct
*p
, int wakeup
);
890 void (*dequeue_task
) (struct rq
*rq
, struct task_struct
*p
, int sleep
);
891 void (*yield_task
) (struct rq
*rq
);
892 int (*select_task_rq
)(struct task_struct
*p
, int sync
);
894 void (*check_preempt_curr
) (struct rq
*rq
, struct task_struct
*p
);
896 struct task_struct
* (*pick_next_task
) (struct rq
*rq
);
897 void (*put_prev_task
) (struct rq
*rq
, struct task_struct
*p
);
900 unsigned long (*load_balance
) (struct rq
*this_rq
, int this_cpu
,
901 struct rq
*busiest
, unsigned long max_load_move
,
902 struct sched_domain
*sd
, enum cpu_idle_type idle
,
903 int *all_pinned
, int *this_best_prio
);
905 int (*move_one_task
) (struct rq
*this_rq
, int this_cpu
,
906 struct rq
*busiest
, struct sched_domain
*sd
,
907 enum cpu_idle_type idle
);
908 void (*pre_schedule
) (struct rq
*this_rq
, struct task_struct
*task
);
909 void (*post_schedule
) (struct rq
*this_rq
);
910 void (*task_wake_up
) (struct rq
*this_rq
, struct task_struct
*task
);
913 void (*set_curr_task
) (struct rq
*rq
);
914 void (*task_tick
) (struct rq
*rq
, struct task_struct
*p
, int queued
);
915 void (*task_new
) (struct rq
*rq
, struct task_struct
*p
);
916 void (*set_cpus_allowed
)(struct task_struct
*p
,
917 const cpumask_t
*newmask
);
919 void (*rq_online
)(struct rq
*rq
);
920 void (*rq_offline
)(struct rq
*rq
);
922 void (*switched_from
) (struct rq
*this_rq
, struct task_struct
*task
,
924 void (*switched_to
) (struct rq
*this_rq
, struct task_struct
*task
,
926 void (*prio_changed
) (struct rq
*this_rq
, struct task_struct
*task
,
927 int oldprio
, int running
);
929 #ifdef CONFIG_FAIR_GROUP_SCHED
930 void (*moved_group
) (struct task_struct
*p
);
935 unsigned long weight
, inv_weight
;
939 * CFS stats for a schedulable entity (task, task-group etc)
941 * Current field usage histogram:
948 struct sched_entity
{
949 struct load_weight load
; /* for load-balancing */
950 struct rb_node run_node
;
951 struct list_head group_node
;
955 u64 sum_exec_runtime
;
957 u64 prev_sum_exec_runtime
;
962 #ifdef CONFIG_SCHEDSTATS
970 s64 sum_sleep_runtime
;
978 u64 nr_migrations_cold
;
979 u64 nr_failed_migrations_affine
;
980 u64 nr_failed_migrations_running
;
981 u64 nr_failed_migrations_hot
;
982 u64 nr_forced_migrations
;
983 u64 nr_forced2_migrations
;
987 u64 nr_wakeups_migrate
;
988 u64 nr_wakeups_local
;
989 u64 nr_wakeups_remote
;
990 u64 nr_wakeups_affine
;
991 u64 nr_wakeups_affine_attempts
;
992 u64 nr_wakeups_passive
;
996 #ifdef CONFIG_FAIR_GROUP_SCHED
997 struct sched_entity
*parent
;
998 /* rq on which this entity is (to be) queued: */
999 struct cfs_rq
*cfs_rq
;
1000 /* rq "owned" by this entity/group: */
1001 struct cfs_rq
*my_q
;
1005 struct sched_rt_entity
{
1006 struct list_head run_list
;
1007 unsigned int time_slice
;
1008 unsigned long timeout
;
1009 int nr_cpus_allowed
;
1011 struct sched_rt_entity
*back
;
1012 #ifdef CONFIG_RT_GROUP_SCHED
1013 struct sched_rt_entity
*parent
;
1014 /* rq on which this entity is (to be) queued: */
1015 struct rt_rq
*rt_rq
;
1016 /* rq "owned" by this entity/group: */
1021 struct task_struct
{
1022 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
1025 unsigned int flags
; /* per process flags, defined below */
1026 unsigned int ptrace
;
1028 int lock_depth
; /* BKL lock depth */
1031 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1036 int prio
, static_prio
, normal_prio
;
1037 unsigned int rt_priority
;
1038 const struct sched_class
*sched_class
;
1039 struct sched_entity se
;
1040 struct sched_rt_entity rt
;
1042 #ifdef CONFIG_PREEMPT_NOTIFIERS
1043 /* list of struct preempt_notifier: */
1044 struct hlist_head preempt_notifiers
;
1048 * fpu_counter contains the number of consecutive context switches
1049 * that the FPU is used. If this is over a threshold, the lazy fpu
1050 * saving becomes unlazy to save the trap. This is an unsigned char
1051 * so that after 256 times the counter wraps and the behavior turns
1052 * lazy again; this to deal with bursty apps that only use FPU for
1055 unsigned char fpu_counter
;
1056 s8 oomkilladj
; /* OOM kill score adjustment (bit shift). */
1057 #ifdef CONFIG_BLK_DEV_IO_TRACE
1058 unsigned int btrace_seq
;
1061 unsigned int policy
;
1062 cpumask_t cpus_allowed
;
1064 #ifdef CONFIG_PREEMPT_RCU
1065 int rcu_read_lock_nesting
;
1066 int rcu_flipctr_idx
;
1067 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1069 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1070 struct sched_info sched_info
;
1073 struct list_head tasks
;
1075 struct mm_struct
*mm
, *active_mm
;
1078 struct linux_binfmt
*binfmt
;
1080 int exit_code
, exit_signal
;
1081 int pdeath_signal
; /* The signal sent when the parent dies */
1083 unsigned int personality
;
1084 unsigned did_exec
:1;
1088 #ifdef CONFIG_CC_STACKPROTECTOR
1089 /* Canary value for the -fstack-protector gcc feature */
1090 unsigned long stack_canary
;
1093 * pointers to (original) parent process, youngest child, younger sibling,
1094 * older sibling, respectively. (p->father can be replaced with
1095 * p->real_parent->pid)
1097 struct task_struct
*real_parent
; /* real parent process */
1098 struct task_struct
*parent
; /* recipient of SIGCHLD, wait4() reports */
1100 * children/sibling forms the list of my natural children
1102 struct list_head children
; /* list of my children */
1103 struct list_head sibling
; /* linkage in my parent's children list */
1104 struct task_struct
*group_leader
; /* threadgroup leader */
1107 * ptraced is the list of tasks this task is using ptrace on.
1108 * This includes both natural children and PTRACE_ATTACH targets.
1109 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1111 struct list_head ptraced
;
1112 struct list_head ptrace_entry
;
1114 /* PID/PID hash table linkage. */
1115 struct pid_link pids
[PIDTYPE_MAX
];
1116 struct list_head thread_group
;
1118 struct completion
*vfork_done
; /* for vfork() */
1119 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
1120 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
1122 cputime_t utime
, stime
, utimescaled
, stimescaled
;
1124 cputime_t prev_utime
, prev_stime
;
1125 unsigned long nvcsw
, nivcsw
; /* context switch counts */
1126 struct timespec start_time
; /* monotonic time */
1127 struct timespec real_start_time
; /* boot based time */
1128 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1129 unsigned long min_flt
, maj_flt
;
1131 cputime_t it_prof_expires
, it_virt_expires
;
1132 unsigned long long it_sched_expires
;
1133 struct list_head cpu_timers
[3];
1135 /* process credentials */
1136 uid_t uid
,euid
,suid
,fsuid
;
1137 gid_t gid
,egid
,sgid
,fsgid
;
1138 struct group_info
*group_info
;
1139 kernel_cap_t cap_effective
, cap_inheritable
, cap_permitted
, cap_bset
;
1140 struct user_struct
*user
;
1141 unsigned securebits
;
1143 unsigned char jit_keyring
; /* default keyring to attach requested keys to */
1144 struct key
*request_key_auth
; /* assumed request_key authority */
1145 struct key
*thread_keyring
; /* keyring private to this thread */
1147 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
1148 - access with [gs]et_task_comm (which lock
1149 it with task_lock())
1150 - initialized normally by flush_old_exec */
1151 /* file system info */
1152 int link_count
, total_link_count
;
1153 #ifdef CONFIG_SYSVIPC
1155 struct sysv_sem sysvsem
;
1157 #ifdef CONFIG_DETECT_SOFTLOCKUP
1158 /* hung task detection */
1159 unsigned long last_switch_timestamp
;
1160 unsigned long last_switch_count
;
1162 /* CPU-specific state of this task */
1163 struct thread_struct thread
;
1164 /* filesystem information */
1165 struct fs_struct
*fs
;
1166 /* open file information */
1167 struct files_struct
*files
;
1169 struct nsproxy
*nsproxy
;
1170 /* signal handlers */
1171 struct signal_struct
*signal
;
1172 struct sighand_struct
*sighand
;
1174 sigset_t blocked
, real_blocked
;
1175 sigset_t saved_sigmask
; /* restored if set_restore_sigmask() was used */
1176 struct sigpending pending
;
1178 unsigned long sas_ss_sp
;
1180 int (*notifier
)(void *priv
);
1181 void *notifier_data
;
1182 sigset_t
*notifier_mask
;
1183 #ifdef CONFIG_SECURITY
1186 struct audit_context
*audit_context
;
1187 #ifdef CONFIG_AUDITSYSCALL
1189 unsigned int sessionid
;
1193 /* Thread group tracking */
1196 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1197 spinlock_t alloc_lock
;
1199 /* Protection of the PI data structures: */
1202 #ifdef CONFIG_RT_MUTEXES
1203 /* PI waiters blocked on a rt_mutex held by this task */
1204 struct plist_head pi_waiters
;
1205 /* Deadlock detection and priority inheritance handling */
1206 struct rt_mutex_waiter
*pi_blocked_on
;
1209 #ifdef CONFIG_DEBUG_MUTEXES
1210 /* mutex deadlock detection */
1211 struct mutex_waiter
*blocked_on
;
1213 #ifdef CONFIG_TRACE_IRQFLAGS
1214 unsigned int irq_events
;
1215 int hardirqs_enabled
;
1216 unsigned long hardirq_enable_ip
;
1217 unsigned int hardirq_enable_event
;
1218 unsigned long hardirq_disable_ip
;
1219 unsigned int hardirq_disable_event
;
1220 int softirqs_enabled
;
1221 unsigned long softirq_disable_ip
;
1222 unsigned int softirq_disable_event
;
1223 unsigned long softirq_enable_ip
;
1224 unsigned int softirq_enable_event
;
1225 int hardirq_context
;
1226 int softirq_context
;
1228 #ifdef CONFIG_LOCKDEP
1229 # define MAX_LOCK_DEPTH 48UL
1232 unsigned int lockdep_recursion
;
1233 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1236 /* journalling filesystem info */
1239 /* stacked block device info */
1240 struct bio
*bio_list
, **bio_tail
;
1243 struct reclaim_state
*reclaim_state
;
1245 struct backing_dev_info
*backing_dev_info
;
1247 struct io_context
*io_context
;
1249 unsigned long ptrace_message
;
1250 siginfo_t
*last_siginfo
; /* For ptrace use. */
1251 #ifdef CONFIG_TASK_XACCT
1252 /* i/o counters(bytes read/written, #syscalls */
1253 u64 rchar
, wchar
, syscr
, syscw
;
1255 struct task_io_accounting ioac
;
1256 #if defined(CONFIG_TASK_XACCT)
1257 u64 acct_rss_mem1
; /* accumulated rss usage */
1258 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1259 cputime_t acct_stimexpd
;/* stime since last update */
1261 #ifdef CONFIG_CPUSETS
1262 nodemask_t mems_allowed
;
1263 int cpuset_mems_generation
;
1264 int cpuset_mem_spread_rotor
;
1266 #ifdef CONFIG_CGROUPS
1267 /* Control Group info protected by css_set_lock */
1268 struct css_set
*cgroups
;
1269 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1270 struct list_head cg_list
;
1273 struct robust_list_head __user
*robust_list
;
1274 #ifdef CONFIG_COMPAT
1275 struct compat_robust_list_head __user
*compat_robust_list
;
1277 struct list_head pi_state_list
;
1278 struct futex_pi_state
*pi_state_cache
;
1281 struct mempolicy
*mempolicy
;
1284 atomic_t fs_excl
; /* holding fs exclusive resources */
1285 struct rcu_head rcu
;
1288 * cache last used pipe for splice
1290 struct pipe_inode_info
*splice_pipe
;
1291 #ifdef CONFIG_TASK_DELAY_ACCT
1292 struct task_delay_info
*delays
;
1294 #ifdef CONFIG_FAULT_INJECTION
1297 struct prop_local_single dirties
;
1298 #ifdef CONFIG_LATENCYTOP
1299 int latency_record_count
;
1300 struct latency_record latency_record
[LT_SAVECOUNT
];
1305 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1306 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1307 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1308 * values are inverted: lower p->prio value means higher priority.
1310 * The MAX_USER_RT_PRIO value allows the actual maximum
1311 * RT priority to be separate from the value exported to
1312 * user-space. This allows kernel threads to set their
1313 * priority to a value higher than any user task. Note:
1314 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1317 #define MAX_USER_RT_PRIO 100
1318 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1320 #define MAX_PRIO (MAX_RT_PRIO + 40)
1321 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1323 static inline int rt_prio(int prio
)
1325 if (unlikely(prio
< MAX_RT_PRIO
))
1330 static inline int rt_task(struct task_struct
*p
)
1332 return rt_prio(p
->prio
);
1335 static inline void set_task_session(struct task_struct
*tsk
, pid_t session
)
1337 tsk
->signal
->__session
= session
;
1340 static inline void set_task_pgrp(struct task_struct
*tsk
, pid_t pgrp
)
1342 tsk
->signal
->__pgrp
= pgrp
;
1345 static inline struct pid
*task_pid(struct task_struct
*task
)
1347 return task
->pids
[PIDTYPE_PID
].pid
;
1350 static inline struct pid
*task_tgid(struct task_struct
*task
)
1352 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1355 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1357 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1360 static inline struct pid
*task_session(struct task_struct
*task
)
1362 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1365 struct pid_namespace
;
1368 * the helpers to get the task's different pids as they are seen
1369 * from various namespaces
1371 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1372 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1374 * task_xid_nr_ns() : id seen from the ns specified;
1376 * set_task_vxid() : assigns a virtual id to a task;
1378 * see also pid_nr() etc in include/linux/pid.h
1381 static inline pid_t
task_pid_nr(struct task_struct
*tsk
)
1386 pid_t
task_pid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1388 static inline pid_t
task_pid_vnr(struct task_struct
*tsk
)
1390 return pid_vnr(task_pid(tsk
));
1394 static inline pid_t
task_tgid_nr(struct task_struct
*tsk
)
1399 pid_t
task_tgid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1401 static inline pid_t
task_tgid_vnr(struct task_struct
*tsk
)
1403 return pid_vnr(task_tgid(tsk
));
1407 static inline pid_t
task_pgrp_nr(struct task_struct
*tsk
)
1409 return tsk
->signal
->__pgrp
;
1412 pid_t
task_pgrp_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1414 static inline pid_t
task_pgrp_vnr(struct task_struct
*tsk
)
1416 return pid_vnr(task_pgrp(tsk
));
1420 static inline pid_t
task_session_nr(struct task_struct
*tsk
)
1422 return tsk
->signal
->__session
;
1425 pid_t
task_session_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1427 static inline pid_t
task_session_vnr(struct task_struct
*tsk
)
1429 return pid_vnr(task_session(tsk
));
1434 * pid_alive - check that a task structure is not stale
1435 * @p: Task structure to be checked.
1437 * Test if a process is not yet dead (at most zombie state)
1438 * If pid_alive fails, then pointers within the task structure
1439 * can be stale and must not be dereferenced.
1441 static inline int pid_alive(struct task_struct
*p
)
1443 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1447 * is_global_init - check if a task structure is init
1448 * @tsk: Task structure to be checked.
1450 * Check if a task structure is the first user space task the kernel created.
1452 static inline int is_global_init(struct task_struct
*tsk
)
1454 return tsk
->pid
== 1;
1458 * is_container_init:
1459 * check whether in the task is init in its own pid namespace.
1461 extern int is_container_init(struct task_struct
*tsk
);
1463 extern struct pid
*cad_pid
;
1465 extern void free_task(struct task_struct
*tsk
);
1466 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1468 extern void __put_task_struct(struct task_struct
*t
);
1470 static inline void put_task_struct(struct task_struct
*t
)
1472 if (atomic_dec_and_test(&t
->usage
))
1473 __put_task_struct(t
);
1479 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1480 /* Not implemented yet, only for 486*/
1481 #define PF_STARTING 0x00000002 /* being created */
1482 #define PF_EXITING 0x00000004 /* getting shut down */
1483 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1484 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1485 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1486 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1487 #define PF_DUMPCORE 0x00000200 /* dumped core */
1488 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1489 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1490 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1491 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1492 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1493 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1494 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1495 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1496 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1497 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1498 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1499 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1500 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1501 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1502 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1503 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1504 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1505 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1506 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1507 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1510 * Only the _current_ task can read/write to tsk->flags, but other
1511 * tasks can access tsk->flags in readonly mode for example
1512 * with tsk_used_math (like during threaded core dumping).
1513 * There is however an exception to this rule during ptrace
1514 * or during fork: the ptracer task is allowed to write to the
1515 * child->flags of its traced child (same goes for fork, the parent
1516 * can write to the child->flags), because we're guaranteed the
1517 * child is not running and in turn not changing child->flags
1518 * at the same time the parent does it.
1520 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1521 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1522 #define clear_used_math() clear_stopped_child_used_math(current)
1523 #define set_used_math() set_stopped_child_used_math(current)
1524 #define conditional_stopped_child_used_math(condition, child) \
1525 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1526 #define conditional_used_math(condition) \
1527 conditional_stopped_child_used_math(condition, current)
1528 #define copy_to_stopped_child_used_math(child) \
1529 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1530 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1531 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1532 #define used_math() tsk_used_math(current)
1535 extern int set_cpus_allowed_ptr(struct task_struct
*p
,
1536 const cpumask_t
*new_mask
);
1538 static inline int set_cpus_allowed_ptr(struct task_struct
*p
,
1539 const cpumask_t
*new_mask
)
1541 if (!cpu_isset(0, *new_mask
))
1546 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1548 return set_cpus_allowed_ptr(p
, &new_mask
);
1551 extern unsigned long long sched_clock(void);
1553 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1554 static inline void sched_clock_init(void)
1558 static inline u64
sched_clock_cpu(int cpu
)
1560 return sched_clock();
1563 static inline void sched_clock_tick(void)
1567 static inline void sched_clock_idle_sleep_event(void)
1571 static inline void sched_clock_idle_wakeup_event(u64 delta_ns
)
1576 static inline void sched_clock_tick_stop(int cpu
)
1580 static inline void sched_clock_tick_start(int cpu
)
1585 #else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
1586 extern void sched_clock_init(void);
1587 extern u64
sched_clock_cpu(int cpu
);
1588 extern void sched_clock_tick(void);
1589 extern void sched_clock_idle_sleep_event(void);
1590 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1592 extern void sched_clock_tick_stop(int cpu
);
1593 extern void sched_clock_tick_start(int cpu
);
1595 #endif /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
1598 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1599 * clock constructed from sched_clock():
1601 extern unsigned long long cpu_clock(int cpu
);
1603 extern unsigned long long
1604 task_sched_runtime(struct task_struct
*task
);
1606 /* sched_exec is called by processes performing an exec */
1608 extern void sched_exec(void);
1610 #define sched_exec() {}
1613 extern void sched_clock_idle_sleep_event(void);
1614 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1616 #ifdef CONFIG_HOTPLUG_CPU
1617 extern void idle_task_exit(void);
1619 static inline void idle_task_exit(void) {}
1622 extern void sched_idle_next(void);
1624 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1625 extern void wake_up_idle_cpu(int cpu
);
1627 static inline void wake_up_idle_cpu(int cpu
) { }
1630 #ifdef CONFIG_SCHED_DEBUG
1631 extern unsigned int sysctl_sched_latency
;
1632 extern unsigned int sysctl_sched_min_granularity
;
1633 extern unsigned int sysctl_sched_wakeup_granularity
;
1634 extern unsigned int sysctl_sched_child_runs_first
;
1635 extern unsigned int sysctl_sched_features
;
1636 extern unsigned int sysctl_sched_migration_cost
;
1637 extern unsigned int sysctl_sched_nr_migrate
;
1638 extern unsigned int sysctl_sched_shares_ratelimit
;
1640 int sched_nr_latency_handler(struct ctl_table
*table
, int write
,
1641 struct file
*file
, void __user
*buffer
, size_t *length
,
1644 extern unsigned int sysctl_sched_rt_period
;
1645 extern int sysctl_sched_rt_runtime
;
1647 int sched_rt_handler(struct ctl_table
*table
, int write
,
1648 struct file
*filp
, void __user
*buffer
, size_t *lenp
,
1651 extern unsigned int sysctl_sched_compat_yield
;
1653 #ifdef CONFIG_RT_MUTEXES
1654 extern int rt_mutex_getprio(struct task_struct
*p
);
1655 extern void rt_mutex_setprio(struct task_struct
*p
, int prio
);
1656 extern void rt_mutex_adjust_pi(struct task_struct
*p
);
1658 static inline int rt_mutex_getprio(struct task_struct
*p
)
1660 return p
->normal_prio
;
1662 # define rt_mutex_adjust_pi(p) do { } while (0)
1665 extern void set_user_nice(struct task_struct
*p
, long nice
);
1666 extern int task_prio(const struct task_struct
*p
);
1667 extern int task_nice(const struct task_struct
*p
);
1668 extern int can_nice(const struct task_struct
*p
, const int nice
);
1669 extern int task_curr(const struct task_struct
*p
);
1670 extern int idle_cpu(int cpu
);
1671 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
1672 extern int sched_setscheduler_nocheck(struct task_struct
*, int,
1673 struct sched_param
*);
1674 extern struct task_struct
*idle_task(int cpu
);
1675 extern struct task_struct
*curr_task(int cpu
);
1676 extern void set_curr_task(int cpu
, struct task_struct
*p
);
1681 * The default (Linux) execution domain.
1683 extern struct exec_domain default_exec_domain
;
1685 union thread_union
{
1686 struct thread_info thread_info
;
1687 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1690 #ifndef __HAVE_ARCH_KSTACK_END
1691 static inline int kstack_end(void *addr
)
1693 /* Reliable end of stack detection:
1694 * Some APM bios versions misalign the stack
1696 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1700 extern union thread_union init_thread_union
;
1701 extern struct task_struct init_task
;
1703 extern struct mm_struct init_mm
;
1705 extern struct pid_namespace init_pid_ns
;
1708 * find a task by one of its numerical ids
1710 * find_task_by_pid_type_ns():
1711 * it is the most generic call - it finds a task by all id,
1712 * type and namespace specified
1713 * find_task_by_pid_ns():
1714 * finds a task by its pid in the specified namespace
1715 * find_task_by_vpid():
1716 * finds a task by its virtual pid
1717 * find_task_by_pid():
1718 * finds a task by its global pid
1720 * see also find_pid() etc in include/linux/pid.h
1723 extern struct task_struct
*find_task_by_pid_type_ns(int type
, int pid
,
1724 struct pid_namespace
*ns
);
1726 static inline struct task_struct
*__deprecated
find_task_by_pid(pid_t nr
)
1728 return find_task_by_pid_type_ns(PIDTYPE_PID
, nr
, &init_pid_ns
);
1730 extern struct task_struct
*find_task_by_vpid(pid_t nr
);
1731 extern struct task_struct
*find_task_by_pid_ns(pid_t nr
,
1732 struct pid_namespace
*ns
);
1734 extern void __set_special_pids(struct pid
*pid
);
1736 /* per-UID process charging. */
1737 extern struct user_struct
* alloc_uid(struct user_namespace
*, uid_t
);
1738 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1740 atomic_inc(&u
->__count
);
1743 extern void free_uid(struct user_struct
*);
1744 extern void switch_uid(struct user_struct
*);
1745 extern void release_uids(struct user_namespace
*ns
);
1747 #include <asm/current.h>
1749 extern void do_timer(unsigned long ticks
);
1751 extern int wake_up_state(struct task_struct
*tsk
, unsigned int state
);
1752 extern int wake_up_process(struct task_struct
*tsk
);
1753 extern void wake_up_new_task(struct task_struct
*tsk
,
1754 unsigned long clone_flags
);
1756 extern void kick_process(struct task_struct
*tsk
);
1758 static inline void kick_process(struct task_struct
*tsk
) { }
1760 extern void sched_fork(struct task_struct
*p
, int clone_flags
);
1761 extern void sched_dead(struct task_struct
*p
);
1763 extern int in_group_p(gid_t
);
1764 extern int in_egroup_p(gid_t
);
1766 extern void proc_caches_init(void);
1767 extern void flush_signals(struct task_struct
*);
1768 extern void ignore_signals(struct task_struct
*);
1769 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
1770 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
1772 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
1774 unsigned long flags
;
1777 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
1778 ret
= dequeue_signal(tsk
, mask
, info
);
1779 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
1784 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
1786 extern void unblock_all_signals(void);
1787 extern void release_task(struct task_struct
* p
);
1788 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
1789 extern int force_sigsegv(int, struct task_struct
*);
1790 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
1791 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
1792 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
1793 extern int kill_pid_info_as_uid(int, struct siginfo
*, struct pid
*, uid_t
, uid_t
, u32
);
1794 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
1795 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
1796 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
1797 extern void do_notify_parent(struct task_struct
*, int);
1798 extern void force_sig(int, struct task_struct
*);
1799 extern void force_sig_specific(int, struct task_struct
*);
1800 extern int send_sig(int, struct task_struct
*, int);
1801 extern void zap_other_threads(struct task_struct
*p
);
1802 extern int kill_proc(pid_t
, int, int);
1803 extern struct sigqueue
*sigqueue_alloc(void);
1804 extern void sigqueue_free(struct sigqueue
*);
1805 extern int send_sigqueue(struct sigqueue
*, struct task_struct
*, int group
);
1806 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
1807 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
1809 static inline int kill_cad_pid(int sig
, int priv
)
1811 return kill_pid(cad_pid
, sig
, priv
);
1814 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1815 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1816 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1817 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1819 static inline int is_si_special(const struct siginfo
*info
)
1821 return info
<= SEND_SIG_FORCED
;
1824 /* True if we are on the alternate signal stack. */
1826 static inline int on_sig_stack(unsigned long sp
)
1828 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
1831 static inline int sas_ss_flags(unsigned long sp
)
1833 return (current
->sas_ss_size
== 0 ? SS_DISABLE
1834 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
1838 * Routines for handling mm_structs
1840 extern struct mm_struct
* mm_alloc(void);
1842 /* mmdrop drops the mm and the page tables */
1843 extern void __mmdrop(struct mm_struct
*);
1844 static inline void mmdrop(struct mm_struct
* mm
)
1846 if (unlikely(atomic_dec_and_test(&mm
->mm_count
)))
1850 /* mmput gets rid of the mappings and all user-space */
1851 extern void mmput(struct mm_struct
*);
1852 /* Grab a reference to a task's mm, if it is not already going away */
1853 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
1854 /* Remove the current tasks stale references to the old mm_struct */
1855 extern void mm_release(struct task_struct
*, struct mm_struct
*);
1856 /* Allocate a new mm structure and copy contents from tsk->mm */
1857 extern struct mm_struct
*dup_mm(struct task_struct
*tsk
);
1859 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct
*, struct pt_regs
*);
1860 extern void flush_thread(void);
1861 extern void exit_thread(void);
1863 extern void exit_files(struct task_struct
*);
1864 extern void __cleanup_signal(struct signal_struct
*);
1865 extern void __cleanup_sighand(struct sighand_struct
*);
1867 extern void exit_itimers(struct signal_struct
*);
1868 extern void flush_itimer_signals(void);
1870 extern NORET_TYPE
void do_group_exit(int);
1872 extern void daemonize(const char *, ...);
1873 extern int allow_signal(int);
1874 extern int disallow_signal(int);
1876 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
1877 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
1878 struct task_struct
*fork_idle(int);
1880 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
1881 extern char *get_task_comm(char *to
, struct task_struct
*tsk
);
1884 extern void wait_task_inactive(struct task_struct
* p
);
1886 #define wait_task_inactive(p) do { } while (0)
1889 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1891 #define for_each_process(p) \
1892 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1895 * Careful: do_each_thread/while_each_thread is a double loop so
1896 * 'break' will not work as expected - use goto instead.
1898 #define do_each_thread(g, t) \
1899 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1901 #define while_each_thread(g, t) \
1902 while ((t = next_thread(t)) != g)
1904 /* de_thread depends on thread_group_leader not being a pid based check */
1905 #define thread_group_leader(p) (p == p->group_leader)
1907 /* Do to the insanities of de_thread it is possible for a process
1908 * to have the pid of the thread group leader without actually being
1909 * the thread group leader. For iteration through the pids in proc
1910 * all we care about is that we have a task with the appropriate
1911 * pid, we don't actually care if we have the right task.
1913 static inline int has_group_leader_pid(struct task_struct
*p
)
1915 return p
->pid
== p
->tgid
;
1919 int same_thread_group(struct task_struct
*p1
, struct task_struct
*p2
)
1921 return p1
->tgid
== p2
->tgid
;
1924 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
1926 return list_entry(rcu_dereference(p
->thread_group
.next
),
1927 struct task_struct
, thread_group
);
1930 static inline int thread_group_empty(struct task_struct
*p
)
1932 return list_empty(&p
->thread_group
);
1935 #define delay_group_leader(p) \
1936 (thread_group_leader(p) && !thread_group_empty(p))
1939 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1940 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1941 * pins the final release of task.io_context. Also protects ->cpuset and
1942 * ->cgroup.subsys[].
1944 * Nests both inside and outside of read_lock(&tasklist_lock).
1945 * It must not be nested with write_lock_irq(&tasklist_lock),
1946 * neither inside nor outside.
1948 static inline void task_lock(struct task_struct
*p
)
1950 spin_lock(&p
->alloc_lock
);
1953 static inline void task_unlock(struct task_struct
*p
)
1955 spin_unlock(&p
->alloc_lock
);
1958 extern struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
1959 unsigned long *flags
);
1961 static inline void unlock_task_sighand(struct task_struct
*tsk
,
1962 unsigned long *flags
)
1964 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
1967 #ifndef __HAVE_THREAD_FUNCTIONS
1969 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
1970 #define task_stack_page(task) ((task)->stack)
1972 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
1974 *task_thread_info(p
) = *task_thread_info(org
);
1975 task_thread_info(p
)->task
= p
;
1978 static inline unsigned long *end_of_stack(struct task_struct
*p
)
1980 return (unsigned long *)(task_thread_info(p
) + 1);
1985 extern void thread_info_cache_init(void);
1987 /* set thread flags in other task's structures
1988 * - see asm/thread_info.h for TIF_xxxx flags available
1990 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1992 set_ti_thread_flag(task_thread_info(tsk
), flag
);
1995 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1997 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2000 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2002 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
2005 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2007 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2010 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2012 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
2015 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
2017 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2020 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
2022 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2025 static inline int test_tsk_need_resched(struct task_struct
*tsk
)
2027 return unlikely(test_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
));
2030 static inline int signal_pending(struct task_struct
*p
)
2032 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
2035 extern int __fatal_signal_pending(struct task_struct
*p
);
2037 static inline int fatal_signal_pending(struct task_struct
*p
)
2039 return signal_pending(p
) && __fatal_signal_pending(p
);
2042 static inline int signal_pending_state(long state
, struct task_struct
*p
)
2044 if (!(state
& (TASK_INTERRUPTIBLE
| TASK_WAKEKILL
)))
2046 if (!signal_pending(p
))
2049 if (state
& (__TASK_STOPPED
| __TASK_TRACED
))
2052 return (state
& TASK_INTERRUPTIBLE
) || __fatal_signal_pending(p
);
2055 static inline int need_resched(void)
2057 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
2061 * cond_resched() and cond_resched_lock(): latency reduction via
2062 * explicit rescheduling in places that are safe. The return
2063 * value indicates whether a reschedule was done in fact.
2064 * cond_resched_lock() will drop the spinlock before scheduling,
2065 * cond_resched_softirq() will enable bhs before scheduling.
2067 extern int _cond_resched(void);
2068 #ifdef CONFIG_PREEMPT_BKL
2069 static inline int cond_resched(void)
2074 static inline int cond_resched(void)
2076 return _cond_resched();
2079 extern int cond_resched_lock(spinlock_t
* lock
);
2080 extern int cond_resched_softirq(void);
2081 static inline int cond_resched_bkl(void)
2083 return _cond_resched();
2087 * Does a critical section need to be broken due to another
2088 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2089 * but a general need for low latency)
2091 static inline int spin_needbreak(spinlock_t
*lock
)
2093 #ifdef CONFIG_PREEMPT
2094 return spin_is_contended(lock
);
2101 * Reevaluate whether the task has signals pending delivery.
2102 * Wake the task if so.
2103 * This is required every time the blocked sigset_t changes.
2104 * callers must hold sighand->siglock.
2106 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
2107 extern void recalc_sigpending(void);
2109 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
2112 * Wrappers for p->thread_info->cpu access. No-op on UP.
2116 static inline unsigned int task_cpu(const struct task_struct
*p
)
2118 return task_thread_info(p
)->cpu
;
2121 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
2125 static inline unsigned int task_cpu(const struct task_struct
*p
)
2130 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
2134 #endif /* CONFIG_SMP */
2136 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
2137 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
2139 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
)
2141 mm
->mmap_base
= TASK_UNMAPPED_BASE
;
2142 mm
->get_unmapped_area
= arch_get_unmapped_area
;
2143 mm
->unmap_area
= arch_unmap_area
;
2147 #ifdef CONFIG_TRACING
2149 __trace_special(void *__tr
, void *__data
,
2150 unsigned long arg1
, unsigned long arg2
, unsigned long arg3
);
2153 __trace_special(void *__tr
, void *__data
,
2154 unsigned long arg1
, unsigned long arg2
, unsigned long arg3
)
2159 extern long sched_setaffinity(pid_t pid
, const cpumask_t
*new_mask
);
2160 extern long sched_getaffinity(pid_t pid
, cpumask_t
*mask
);
2162 extern int sched_mc_power_savings
, sched_smt_power_savings
;
2164 extern void normalize_rt_tasks(void);
2166 #ifdef CONFIG_GROUP_SCHED
2168 extern struct task_group init_task_group
;
2169 #ifdef CONFIG_USER_SCHED
2170 extern struct task_group root_task_group
;
2173 extern struct task_group
*sched_create_group(struct task_group
*parent
);
2174 extern void sched_destroy_group(struct task_group
*tg
);
2175 extern void sched_move_task(struct task_struct
*tsk
);
2176 #ifdef CONFIG_FAIR_GROUP_SCHED
2177 extern int sched_group_set_shares(struct task_group
*tg
, unsigned long shares
);
2178 extern unsigned long sched_group_shares(struct task_group
*tg
);
2180 #ifdef CONFIG_RT_GROUP_SCHED
2181 extern int sched_group_set_rt_runtime(struct task_group
*tg
,
2182 long rt_runtime_us
);
2183 extern long sched_group_rt_runtime(struct task_group
*tg
);
2184 extern int sched_group_set_rt_period(struct task_group
*tg
,
2186 extern long sched_group_rt_period(struct task_group
*tg
);
2190 #ifdef CONFIG_TASK_XACCT
2191 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2196 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2201 static inline void inc_syscr(struct task_struct
*tsk
)
2206 static inline void inc_syscw(struct task_struct
*tsk
)
2211 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2215 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2219 static inline void inc_syscr(struct task_struct
*tsk
)
2223 static inline void inc_syscw(struct task_struct
*tsk
)
2229 void migration_init(void);
2231 static inline void migration_init(void)
2236 #ifndef TASK_SIZE_OF
2237 #define TASK_SIZE_OF(tsk) TASK_SIZE
2240 #ifdef CONFIG_MM_OWNER
2241 extern void mm_update_next_owner(struct mm_struct
*mm
);
2242 extern void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
);
2244 static inline void mm_update_next_owner(struct mm_struct
*mm
)
2248 static inline void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
)
2251 #endif /* CONFIG_MM_OWNER */
2253 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2255 #endif /* __KERNEL__ */