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);
140 extern u64 cpu_nr_switches(int cpu);
141 extern u64 cpu_nr_migrations(int cpu);
146 #ifdef CONFIG_SCHED_DEBUG
147 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
148 extern void proc_sched_set_task(struct task_struct *p);
150 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
153 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
156 static inline void proc_sched_set_task(struct task_struct *p)
160 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
165 extern unsigned long long time_sync_thresh;
168 * Task state bitmask. NOTE! These bits are also
169 * encoded in fs/proc/array.c: get_task_state().
171 * We have two separate sets of flags: task->state
172 * is about runnability, while task->exit_state are
173 * about the task exiting. Confusing, but this way
174 * modifying one set can't modify the other one by
177 #define TASK_RUNNING 0
178 #define TASK_INTERRUPTIBLE 1
179 #define TASK_UNINTERRUPTIBLE 2
180 #define __TASK_STOPPED 4
181 #define __TASK_TRACED 8
182 /* in tsk->exit_state */
183 #define EXIT_ZOMBIE 16
185 /* in tsk->state again */
187 #define TASK_WAKEKILL 128
189 /* Convenience macros for the sake of set_task_state */
190 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
191 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
192 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
194 /* Convenience macros for the sake of wake_up */
195 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
196 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
198 /* get_task_state() */
199 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
200 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
203 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
204 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
205 #define task_is_stopped_or_traced(task) \
206 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
207 #define task_contributes_to_load(task) \
208 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
210 #define __set_task_state(tsk, state_value) \
211 do { (tsk)->state = (state_value); } while (0)
212 #define set_task_state(tsk, state_value) \
213 set_mb((tsk)->state, (state_value))
216 * set_current_state() includes a barrier so that the write of current->state
217 * is correctly serialised wrt the caller's subsequent test of whether to
220 * set_current_state(TASK_UNINTERRUPTIBLE);
221 * if (do_i_need_to_sleep())
224 * If the caller does not need such serialisation then use __set_current_state()
226 #define __set_current_state(state_value) \
227 do { current->state = (state_value); } while (0)
228 #define set_current_state(state_value) \
229 set_mb(current->state, (state_value))
231 /* Task command name length */
232 #define TASK_COMM_LEN 16
234 #include <linux/spinlock.h>
237 * This serializes "schedule()" and also protects
238 * the run-queue from deletions/modifications (but
239 * _adding_ to the beginning of the run-queue has
242 extern rwlock_t tasklist_lock;
243 extern spinlock_t mmlist_lock;
247 extern void sched_init(void);
248 extern void sched_init_smp(void);
249 extern asmlinkage void schedule_tail(struct task_struct *prev);
250 extern void init_idle(struct task_struct *idle, int cpu);
251 extern void init_idle_bootup_task(struct task_struct *idle);
253 extern int runqueue_is_locked(void);
254 extern void task_rq_unlock_wait(struct task_struct *p);
256 extern cpumask_var_t nohz_cpu_mask;
257 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
258 extern int select_nohz_load_balancer(int cpu);
260 static inline int select_nohz_load_balancer(int cpu)
267 * Only dump TASK_* tasks. (0 for all tasks)
269 extern void show_state_filter(unsigned long state_filter);
271 static inline void show_state(void)
273 show_state_filter(0);
276 extern void show_regs(struct pt_regs *);
279 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
280 * task), SP is the stack pointer of the first frame that should be shown in the back
281 * trace (or NULL if the entire call-chain of the task should be shown).
283 extern void show_stack(struct task_struct *task, unsigned long *sp);
285 void io_schedule(void);
286 long io_schedule_timeout(long timeout);
288 extern void cpu_init (void);
289 extern void trap_init(void);
290 extern void update_process_times(int user);
291 extern void scheduler_tick(void);
293 extern void sched_show_task(struct task_struct *p);
295 #ifdef CONFIG_DETECT_SOFTLOCKUP
296 extern void softlockup_tick(void);
297 extern void touch_softlockup_watchdog(void);
298 extern void touch_all_softlockup_watchdogs(void);
299 extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
300 struct file *filp, void __user *buffer,
301 size_t *lenp, loff_t *ppos);
302 extern unsigned int softlockup_panic;
303 extern unsigned long sysctl_hung_task_check_count;
304 extern unsigned long sysctl_hung_task_timeout_secs;
305 extern unsigned long sysctl_hung_task_warnings;
306 extern int softlockup_thresh;
308 static inline void softlockup_tick(void)
311 static inline void spawn_softlockup_task(void)
314 static inline void touch_softlockup_watchdog(void)
317 static inline void touch_all_softlockup_watchdogs(void)
323 /* Attach to any functions which should be ignored in wchan output. */
324 #define __sched __attribute__((__section__(".sched.text")))
326 /* Linker adds these: start and end of __sched functions */
327 extern char __sched_text_start[], __sched_text_end[];
329 /* Is this address in the __sched functions? */
330 extern int in_sched_functions(unsigned long addr);
332 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
333 extern signed long schedule_timeout(signed long timeout);
334 extern signed long schedule_timeout_interruptible(signed long timeout);
335 extern signed long schedule_timeout_killable(signed long timeout);
336 extern signed long schedule_timeout_uninterruptible(signed long timeout);
337 asmlinkage void schedule(void);
340 struct user_namespace;
342 /* Maximum number of active map areas.. This is a random (large) number */
343 #define DEFAULT_MAX_MAP_COUNT 65536
345 extern int sysctl_max_map_count;
347 #include <linux/aio.h>
350 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
351 unsigned long, unsigned long);
353 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
354 unsigned long len, unsigned long pgoff,
355 unsigned long flags);
356 extern void arch_unmap_area(struct mm_struct *, unsigned long);
357 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
359 #if USE_SPLIT_PTLOCKS
361 * The mm counters are not protected by its page_table_lock,
362 * so must be incremented atomically.
364 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
365 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
366 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
367 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
368 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
370 #else /* !USE_SPLIT_PTLOCKS */
372 * The mm counters are protected by its page_table_lock,
373 * so can be incremented directly.
375 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
376 #define get_mm_counter(mm, member) ((mm)->_##member)
377 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
378 #define inc_mm_counter(mm, member) (mm)->_##member++
379 #define dec_mm_counter(mm, member) (mm)->_##member--
381 #endif /* !USE_SPLIT_PTLOCKS */
383 #define get_mm_rss(mm) \
384 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
385 #define update_hiwater_rss(mm) do { \
386 unsigned long _rss = get_mm_rss(mm); \
387 if ((mm)->hiwater_rss < _rss) \
388 (mm)->hiwater_rss = _rss; \
390 #define update_hiwater_vm(mm) do { \
391 if ((mm)->hiwater_vm < (mm)->total_vm) \
392 (mm)->hiwater_vm = (mm)->total_vm; \
395 #define get_mm_hiwater_rss(mm) max((mm)->hiwater_rss, get_mm_rss(mm))
396 #define get_mm_hiwater_vm(mm) max((mm)->hiwater_vm, (mm)->total_vm)
398 extern void set_dumpable(struct mm_struct *mm, int value);
399 extern int get_dumpable(struct mm_struct *mm);
403 #define MMF_DUMPABLE 0 /* core dump is permitted */
404 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
405 #define MMF_DUMPABLE_BITS 2
407 /* coredump filter bits */
408 #define MMF_DUMP_ANON_PRIVATE 2
409 #define MMF_DUMP_ANON_SHARED 3
410 #define MMF_DUMP_MAPPED_PRIVATE 4
411 #define MMF_DUMP_MAPPED_SHARED 5
412 #define MMF_DUMP_ELF_HEADERS 6
413 #define MMF_DUMP_HUGETLB_PRIVATE 7
414 #define MMF_DUMP_HUGETLB_SHARED 8
415 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
416 #define MMF_DUMP_FILTER_BITS 7
417 #define MMF_DUMP_FILTER_MASK \
418 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
419 #define MMF_DUMP_FILTER_DEFAULT \
420 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
421 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
423 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
424 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
426 # define MMF_DUMP_MASK_DEFAULT_ELF 0
429 struct sighand_struct {
431 struct k_sigaction action[_NSIG];
433 wait_queue_head_t signalfd_wqh;
436 struct pacct_struct {
439 unsigned long ac_mem;
440 cputime_t ac_utime, ac_stime;
441 unsigned long ac_minflt, ac_majflt;
445 * struct task_cputime - collected CPU time counts
446 * @utime: time spent in user mode, in &cputime_t units
447 * @stime: time spent in kernel mode, in &cputime_t units
448 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
449 * @lock: lock for fields in this struct
451 * This structure groups together three kinds of CPU time that are
452 * tracked for threads and thread groups. Most things considering
453 * CPU time want to group these counts together and treat all three
454 * of them in parallel.
456 struct task_cputime {
459 unsigned long long sum_exec_runtime;
462 /* Alternate field names when used to cache expirations. */
463 #define prof_exp stime
464 #define virt_exp utime
465 #define sched_exp sum_exec_runtime
468 * struct thread_group_cputime - thread group interval timer counts
469 * @totals: thread group interval timers; substructure for
470 * uniprocessor kernel, per-cpu for SMP kernel.
472 * This structure contains the version of task_cputime, above, that is
473 * used for thread group CPU clock calculations.
475 struct thread_group_cputime {
476 struct task_cputime totals;
480 * NOTE! "signal_struct" does not have it's own
481 * locking, because a shared signal_struct always
482 * implies a shared sighand_struct, so locking
483 * sighand_struct is always a proper superset of
484 * the locking of signal_struct.
486 struct signal_struct {
490 wait_queue_head_t wait_chldexit; /* for wait4() */
492 /* current thread group signal load-balancing target: */
493 struct task_struct *curr_target;
495 /* shared signal handling: */
496 struct sigpending shared_pending;
498 /* thread group exit support */
501 * - notify group_exit_task when ->count is equal to notify_count
502 * - everyone except group_exit_task is stopped during signal delivery
503 * of fatal signals, group_exit_task processes the signal.
506 struct task_struct *group_exit_task;
508 /* thread group stop support, overloads group_exit_code too */
509 int group_stop_count;
510 unsigned int flags; /* see SIGNAL_* flags below */
512 /* POSIX.1b Interval Timers */
513 struct list_head posix_timers;
515 /* ITIMER_REAL timer for the process */
516 struct hrtimer real_timer;
517 struct pid *leader_pid;
518 ktime_t it_real_incr;
520 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
521 cputime_t it_prof_expires, it_virt_expires;
522 cputime_t it_prof_incr, it_virt_incr;
525 * Thread group totals for process CPU clocks.
526 * See thread_group_cputime(), et al, for details.
528 struct thread_group_cputime cputime;
530 /* Earliest-expiration cache. */
531 struct task_cputime cputime_expires;
533 struct list_head cpu_timers[3];
535 /* job control IDs */
538 * pgrp and session fields are deprecated.
539 * use the task_session_Xnr and task_pgrp_Xnr routines below
543 pid_t pgrp __deprecated;
547 struct pid *tty_old_pgrp;
550 pid_t session __deprecated;
554 /* boolean value for session group leader */
557 struct tty_struct *tty; /* NULL if no tty */
560 * Cumulative resource counters for dead threads in the group,
561 * and for reaped dead child processes forked by this group.
562 * Live threads maintain their own counters and add to these
563 * in __exit_signal, except for the group leader.
565 cputime_t cutime, cstime;
568 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
569 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
570 unsigned long inblock, oublock, cinblock, coublock;
571 struct task_io_accounting ioac;
574 * We don't bother to synchronize most readers of this at all,
575 * because there is no reader checking a limit that actually needs
576 * to get both rlim_cur and rlim_max atomically, and either one
577 * alone is a single word that can safely be read normally.
578 * getrlimit/setrlimit use task_lock(current->group_leader) to
579 * protect this instead of the siglock, because they really
580 * have no need to disable irqs.
582 struct rlimit rlim[RLIM_NLIMITS];
584 #ifdef CONFIG_BSD_PROCESS_ACCT
585 struct pacct_struct pacct; /* per-process accounting information */
587 #ifdef CONFIG_TASKSTATS
588 struct taskstats *stats;
592 struct tty_audit_buf *tty_audit_buf;
596 /* Context switch must be unlocked if interrupts are to be enabled */
597 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
598 # define __ARCH_WANT_UNLOCKED_CTXSW
602 * Bits in flags field of signal_struct.
604 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
605 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
606 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
607 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
609 * Pending notifications to parent.
611 #define SIGNAL_CLD_STOPPED 0x00000010
612 #define SIGNAL_CLD_CONTINUED 0x00000020
613 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
615 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
617 /* If true, all threads except ->group_exit_task have pending SIGKILL */
618 static inline int signal_group_exit(const struct signal_struct *sig)
620 return (sig->flags & SIGNAL_GROUP_EXIT) ||
621 (sig->group_exit_task != NULL);
625 * Some day this will be a full-fledged user tracking system..
628 atomic_t __count; /* reference count */
629 atomic_t processes; /* How many processes does this user have? */
630 atomic_t files; /* How many open files does this user have? */
631 atomic_t sigpending; /* How many pending signals does this user have? */
632 #ifdef CONFIG_INOTIFY_USER
633 atomic_t inotify_watches; /* How many inotify watches does this user have? */
634 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
637 atomic_t epoll_watches; /* The number of file descriptors currently watched */
639 #ifdef CONFIG_POSIX_MQUEUE
640 /* protected by mq_lock */
641 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
643 unsigned long locked_shm; /* How many pages of mlocked shm ? */
646 struct key *uid_keyring; /* UID specific keyring */
647 struct key *session_keyring; /* UID's default session keyring */
650 /* Hash table maintenance information */
651 struct hlist_node uidhash_node;
653 struct user_namespace *user_ns;
655 #ifdef CONFIG_USER_SCHED
656 struct task_group *tg;
659 struct work_struct work;
664 extern int uids_sysfs_init(void);
666 extern struct user_struct *find_user(uid_t);
668 extern struct user_struct root_user;
669 #define INIT_USER (&root_user)
672 struct backing_dev_info;
673 struct reclaim_state;
675 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
677 /* cumulative counters */
678 unsigned long pcount; /* # of times run on this cpu */
679 unsigned long long run_delay; /* time spent waiting on a runqueue */
682 unsigned long long last_arrival,/* when we last ran on a cpu */
683 last_queued; /* when we were last queued to run */
684 #ifdef CONFIG_SCHEDSTATS
686 unsigned int bkl_count;
689 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
691 #ifdef CONFIG_TASK_DELAY_ACCT
692 struct task_delay_info {
694 unsigned int flags; /* Private per-task flags */
696 /* For each stat XXX, add following, aligned appropriately
698 * struct timespec XXX_start, XXX_end;
702 * Atomicity of updates to XXX_delay, XXX_count protected by
703 * single lock above (split into XXX_lock if contention is an issue).
707 * XXX_count is incremented on every XXX operation, the delay
708 * associated with the operation is added to XXX_delay.
709 * XXX_delay contains the accumulated delay time in nanoseconds.
711 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
712 u64 blkio_delay; /* wait for sync block io completion */
713 u64 swapin_delay; /* wait for swapin block io completion */
714 u32 blkio_count; /* total count of the number of sync block */
715 /* io operations performed */
716 u32 swapin_count; /* total count of the number of swapin block */
717 /* io operations performed */
719 struct timespec freepages_start, freepages_end;
720 u64 freepages_delay; /* wait for memory reclaim */
721 u32 freepages_count; /* total count of memory reclaim */
723 #endif /* CONFIG_TASK_DELAY_ACCT */
725 static inline int sched_info_on(void)
727 #ifdef CONFIG_SCHEDSTATS
729 #elif defined(CONFIG_TASK_DELAY_ACCT)
730 extern int delayacct_on;
745 * sched-domains (multiprocessor balancing) declarations:
749 * Increase resolution of nice-level calculations:
751 #define SCHED_LOAD_SHIFT 10
752 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
754 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
757 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
758 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
759 #define SD_BALANCE_EXEC 4 /* Balance on exec */
760 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
761 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
762 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
763 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
764 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
765 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
766 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
767 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
768 #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
770 enum powersavings_balance_level {
771 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */
772 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package
773 * first for long running threads
775 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle
776 * cpu package for power savings
778 MAX_POWERSAVINGS_BALANCE_LEVELS
781 extern int sched_mc_power_savings, sched_smt_power_savings;
783 static inline int sd_balance_for_mc_power(void)
785 if (sched_smt_power_savings)
786 return SD_POWERSAVINGS_BALANCE;
791 static inline int sd_balance_for_package_power(void)
793 if (sched_mc_power_savings | sched_smt_power_savings)
794 return SD_POWERSAVINGS_BALANCE;
800 * Optimise SD flags for power savings:
801 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
802 * Keep default SD flags if sched_{smt,mc}_power_saving=0
805 static inline int sd_power_saving_flags(void)
807 if (sched_mc_power_savings | sched_smt_power_savings)
808 return SD_BALANCE_NEWIDLE;
814 struct sched_group *next; /* Must be a circular list */
817 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
818 * single CPU. This is read only (except for setup, hotplug CPU).
819 * Note : Never change cpu_power without recompute its reciprocal
821 unsigned int __cpu_power;
823 * reciprocal value of cpu_power to avoid expensive divides
824 * (see include/linux/reciprocal_div.h)
826 u32 reciprocal_cpu_power;
828 unsigned long cpumask[];
831 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
833 return to_cpumask(sg->cpumask);
836 enum sched_domain_level {
846 struct sched_domain_attr {
847 int relax_domain_level;
850 #define SD_ATTR_INIT (struct sched_domain_attr) { \
851 .relax_domain_level = -1, \
854 struct sched_domain {
855 /* These fields must be setup */
856 struct sched_domain *parent; /* top domain must be null terminated */
857 struct sched_domain *child; /* bottom domain must be null terminated */
858 struct sched_group *groups; /* the balancing groups of the domain */
859 unsigned long min_interval; /* Minimum balance interval ms */
860 unsigned long max_interval; /* Maximum balance interval ms */
861 unsigned int busy_factor; /* less balancing by factor if busy */
862 unsigned int imbalance_pct; /* No balance until over watermark */
863 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
864 unsigned int busy_idx;
865 unsigned int idle_idx;
866 unsigned int newidle_idx;
867 unsigned int wake_idx;
868 unsigned int forkexec_idx;
869 int flags; /* See SD_* */
870 enum sched_domain_level level;
872 /* Runtime fields. */
873 unsigned long last_balance; /* init to jiffies. units in jiffies */
874 unsigned int balance_interval; /* initialise to 1. units in ms. */
875 unsigned int nr_balance_failed; /* initialise to 0 */
879 #ifdef CONFIG_SCHEDSTATS
880 /* load_balance() stats */
881 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
882 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
883 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
884 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
885 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
886 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
887 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
888 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
890 /* Active load balancing */
891 unsigned int alb_count;
892 unsigned int alb_failed;
893 unsigned int alb_pushed;
895 /* SD_BALANCE_EXEC stats */
896 unsigned int sbe_count;
897 unsigned int sbe_balanced;
898 unsigned int sbe_pushed;
900 /* SD_BALANCE_FORK stats */
901 unsigned int sbf_count;
902 unsigned int sbf_balanced;
903 unsigned int sbf_pushed;
905 /* try_to_wake_up() stats */
906 unsigned int ttwu_wake_remote;
907 unsigned int ttwu_move_affine;
908 unsigned int ttwu_move_balance;
910 #ifdef CONFIG_SCHED_DEBUG
914 /* span of all CPUs in this domain */
915 unsigned long span[];
918 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
920 return to_cpumask(sd->span);
923 extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
924 struct sched_domain_attr *dattr_new);
926 /* Test a flag in parent sched domain */
927 static inline int test_sd_parent(struct sched_domain *sd, int flag)
929 if (sd->parent && (sd->parent->flags & flag))
935 #else /* CONFIG_SMP */
937 struct sched_domain_attr;
940 partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
941 struct sched_domain_attr *dattr_new)
944 #endif /* !CONFIG_SMP */
946 struct io_context; /* See blkdev.h */
949 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
950 extern void prefetch_stack(struct task_struct *t);
952 static inline void prefetch_stack(struct task_struct *t) { }
955 struct audit_context; /* See audit.c */
957 struct pipe_inode_info;
958 struct uts_namespace;
964 const struct sched_class *next;
966 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
967 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
968 void (*yield_task) (struct rq *rq);
970 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
972 struct task_struct * (*pick_next_task) (struct rq *rq);
973 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
976 int (*select_task_rq)(struct task_struct *p, int sync);
978 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
979 struct rq *busiest, unsigned long max_load_move,
980 struct sched_domain *sd, enum cpu_idle_type idle,
981 int *all_pinned, int *this_best_prio);
983 int (*move_one_task) (struct rq *this_rq, int this_cpu,
984 struct rq *busiest, struct sched_domain *sd,
985 enum cpu_idle_type idle);
986 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
987 void (*post_schedule) (struct rq *this_rq);
988 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
990 void (*set_cpus_allowed)(struct task_struct *p,
991 const struct cpumask *newmask);
993 void (*rq_online)(struct rq *rq);
994 void (*rq_offline)(struct rq *rq);
997 void (*set_curr_task) (struct rq *rq);
998 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
999 void (*task_new) (struct rq *rq, struct task_struct *p);
1001 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
1003 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
1005 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1006 int oldprio, int running);
1008 #ifdef CONFIG_FAIR_GROUP_SCHED
1009 void (*moved_group) (struct task_struct *p);
1013 struct load_weight {
1014 unsigned long weight, inv_weight;
1018 * CFS stats for a schedulable entity (task, task-group etc)
1020 * Current field usage histogram:
1027 struct sched_entity {
1028 struct load_weight load; /* for load-balancing */
1029 struct rb_node run_node;
1030 struct list_head group_node;
1034 u64 sum_exec_runtime;
1036 u64 prev_sum_exec_runtime;
1043 #ifdef CONFIG_SCHEDSTATS
1051 s64 sum_sleep_runtime;
1058 u64 nr_migrations_cold;
1059 u64 nr_failed_migrations_affine;
1060 u64 nr_failed_migrations_running;
1061 u64 nr_failed_migrations_hot;
1062 u64 nr_forced_migrations;
1063 u64 nr_forced2_migrations;
1066 u64 nr_wakeups_sync;
1067 u64 nr_wakeups_migrate;
1068 u64 nr_wakeups_local;
1069 u64 nr_wakeups_remote;
1070 u64 nr_wakeups_affine;
1071 u64 nr_wakeups_affine_attempts;
1072 u64 nr_wakeups_passive;
1073 u64 nr_wakeups_idle;
1076 #ifdef CONFIG_FAIR_GROUP_SCHED
1077 struct sched_entity *parent;
1078 /* rq on which this entity is (to be) queued: */
1079 struct cfs_rq *cfs_rq;
1080 /* rq "owned" by this entity/group: */
1081 struct cfs_rq *my_q;
1085 struct sched_rt_entity {
1086 struct list_head run_list;
1087 unsigned long timeout;
1088 unsigned int time_slice;
1089 int nr_cpus_allowed;
1091 struct sched_rt_entity *back;
1092 #ifdef CONFIG_RT_GROUP_SCHED
1093 struct sched_rt_entity *parent;
1094 /* rq on which this entity is (to be) queued: */
1095 struct rt_rq *rt_rq;
1096 /* rq "owned" by this entity/group: */
1101 struct task_struct {
1102 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1105 unsigned int flags; /* per process flags, defined below */
1106 unsigned int ptrace;
1108 int lock_depth; /* BKL lock depth */
1111 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1116 int prio, static_prio, normal_prio;
1117 unsigned int rt_priority;
1118 const struct sched_class *sched_class;
1119 struct sched_entity se;
1120 struct sched_rt_entity rt;
1122 #ifdef CONFIG_PREEMPT_NOTIFIERS
1123 /* list of struct preempt_notifier: */
1124 struct hlist_head preempt_notifiers;
1128 * fpu_counter contains the number of consecutive context switches
1129 * that the FPU is used. If this is over a threshold, the lazy fpu
1130 * saving becomes unlazy to save the trap. This is an unsigned char
1131 * so that after 256 times the counter wraps and the behavior turns
1132 * lazy again; this to deal with bursty apps that only use FPU for
1135 unsigned char fpu_counter;
1136 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
1137 #ifdef CONFIG_BLK_DEV_IO_TRACE
1138 unsigned int btrace_seq;
1141 unsigned int policy;
1142 cpumask_t cpus_allowed;
1144 #ifdef CONFIG_PREEMPT_RCU
1145 int rcu_read_lock_nesting;
1146 int rcu_flipctr_idx;
1147 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1149 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1150 struct sched_info sched_info;
1153 struct list_head tasks;
1155 struct mm_struct *mm, *active_mm;
1158 struct linux_binfmt *binfmt;
1160 int exit_code, exit_signal;
1161 int pdeath_signal; /* The signal sent when the parent dies */
1163 unsigned int personality;
1164 unsigned did_exec:1;
1168 /* Canary value for the -fstack-protector gcc feature */
1169 unsigned long stack_canary;
1172 * pointers to (original) parent process, youngest child, younger sibling,
1173 * older sibling, respectively. (p->father can be replaced with
1174 * p->real_parent->pid)
1176 struct task_struct *real_parent; /* real parent process */
1177 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1179 * children/sibling forms the list of my natural children
1181 struct list_head children; /* list of my children */
1182 struct list_head sibling; /* linkage in my parent's children list */
1183 struct task_struct *group_leader; /* threadgroup leader */
1186 * ptraced is the list of tasks this task is using ptrace on.
1187 * This includes both natural children and PTRACE_ATTACH targets.
1188 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1190 struct list_head ptraced;
1191 struct list_head ptrace_entry;
1193 #ifdef CONFIG_X86_PTRACE_BTS
1195 * This is the tracer handle for the ptrace BTS extension.
1196 * This field actually belongs to the ptracer task.
1198 struct bts_tracer *bts;
1200 * The buffer to hold the BTS data.
1204 #endif /* CONFIG_X86_PTRACE_BTS */
1206 /* PID/PID hash table linkage. */
1207 struct pid_link pids[PIDTYPE_MAX];
1208 struct list_head thread_group;
1210 struct completion *vfork_done; /* for vfork() */
1211 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1212 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1214 cputime_t utime, stime, utimescaled, stimescaled;
1216 cputime_t prev_utime, prev_stime;
1217 unsigned long nvcsw, nivcsw; /* context switch counts */
1218 struct timespec start_time; /* monotonic time */
1219 struct timespec real_start_time; /* boot based time */
1220 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1221 unsigned long min_flt, maj_flt;
1223 struct task_cputime cputime_expires;
1224 struct list_head cpu_timers[3];
1226 /* process credentials */
1227 const struct cred *real_cred; /* objective and real subjective task
1228 * credentials (COW) */
1229 const struct cred *cred; /* effective (overridable) subjective task
1230 * credentials (COW) */
1231 struct mutex cred_exec_mutex; /* execve vs ptrace cred calculation mutex */
1233 char comm[TASK_COMM_LEN]; /* executable name excluding path
1234 - access with [gs]et_task_comm (which lock
1235 it with task_lock())
1236 - initialized normally by flush_old_exec */
1237 /* file system info */
1238 int link_count, total_link_count;
1239 #ifdef CONFIG_SYSVIPC
1241 struct sysv_sem sysvsem;
1243 #ifdef CONFIG_DETECT_SOFTLOCKUP
1244 /* hung task detection */
1245 unsigned long last_switch_timestamp;
1246 unsigned long last_switch_count;
1248 /* CPU-specific state of this task */
1249 struct thread_struct thread;
1250 /* filesystem information */
1251 struct fs_struct *fs;
1252 /* open file information */
1253 struct files_struct *files;
1255 struct nsproxy *nsproxy;
1256 /* signal handlers */
1257 struct signal_struct *signal;
1258 struct sighand_struct *sighand;
1260 sigset_t blocked, real_blocked;
1261 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1262 struct sigpending pending;
1264 unsigned long sas_ss_sp;
1266 int (*notifier)(void *priv);
1267 void *notifier_data;
1268 sigset_t *notifier_mask;
1269 struct audit_context *audit_context;
1270 #ifdef CONFIG_AUDITSYSCALL
1272 unsigned int sessionid;
1276 /* Thread group tracking */
1279 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1280 spinlock_t alloc_lock;
1282 /* Protection of the PI data structures: */
1285 #ifdef CONFIG_RT_MUTEXES
1286 /* PI waiters blocked on a rt_mutex held by this task */
1287 struct plist_head pi_waiters;
1288 /* Deadlock detection and priority inheritance handling */
1289 struct rt_mutex_waiter *pi_blocked_on;
1292 #ifdef CONFIG_DEBUG_MUTEXES
1293 /* mutex deadlock detection */
1294 struct mutex_waiter *blocked_on;
1296 #ifdef CONFIG_TRACE_IRQFLAGS
1297 unsigned int irq_events;
1298 int hardirqs_enabled;
1299 unsigned long hardirq_enable_ip;
1300 unsigned int hardirq_enable_event;
1301 unsigned long hardirq_disable_ip;
1302 unsigned int hardirq_disable_event;
1303 int softirqs_enabled;
1304 unsigned long softirq_disable_ip;
1305 unsigned int softirq_disable_event;
1306 unsigned long softirq_enable_ip;
1307 unsigned int softirq_enable_event;
1308 int hardirq_context;
1309 int softirq_context;
1311 #ifdef CONFIG_LOCKDEP
1312 # define MAX_LOCK_DEPTH 48UL
1315 unsigned int lockdep_recursion;
1316 struct held_lock held_locks[MAX_LOCK_DEPTH];
1319 /* journalling filesystem info */
1322 /* stacked block device info */
1323 struct bio *bio_list, **bio_tail;
1326 struct reclaim_state *reclaim_state;
1328 struct backing_dev_info *backing_dev_info;
1330 struct io_context *io_context;
1332 unsigned long ptrace_message;
1333 siginfo_t *last_siginfo; /* For ptrace use. */
1334 struct task_io_accounting ioac;
1335 #if defined(CONFIG_TASK_XACCT)
1336 u64 acct_rss_mem1; /* accumulated rss usage */
1337 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1338 cputime_t acct_timexpd; /* stime + utime since last update */
1340 #ifdef CONFIG_CPUSETS
1341 nodemask_t mems_allowed;
1342 int cpuset_mems_generation;
1343 int cpuset_mem_spread_rotor;
1345 #ifdef CONFIG_CGROUPS
1346 /* Control Group info protected by css_set_lock */
1347 struct css_set *cgroups;
1348 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1349 struct list_head cg_list;
1352 struct robust_list_head __user *robust_list;
1353 #ifdef CONFIG_COMPAT
1354 struct compat_robust_list_head __user *compat_robust_list;
1356 struct list_head pi_state_list;
1357 struct futex_pi_state *pi_state_cache;
1359 struct perf_counter_context perf_counter_ctx;
1361 struct mempolicy *mempolicy;
1364 atomic_t fs_excl; /* holding fs exclusive resources */
1365 struct rcu_head rcu;
1368 * cache last used pipe for splice
1370 struct pipe_inode_info *splice_pipe;
1371 #ifdef CONFIG_TASK_DELAY_ACCT
1372 struct task_delay_info *delays;
1374 #ifdef CONFIG_FAULT_INJECTION
1377 struct prop_local_single dirties;
1378 #ifdef CONFIG_LATENCYTOP
1379 int latency_record_count;
1380 struct latency_record latency_record[LT_SAVECOUNT];
1383 * time slack values; these are used to round up poll() and
1384 * select() etc timeout values. These are in nanoseconds.
1386 unsigned long timer_slack_ns;
1387 unsigned long default_timer_slack_ns;
1389 struct list_head *scm_work_list;
1390 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1391 /* Index of current stored adress in ret_stack */
1393 /* Stack of return addresses for return function tracing */
1394 struct ftrace_ret_stack *ret_stack;
1396 * Number of functions that haven't been traced
1397 * because of depth overrun.
1399 atomic_t trace_overrun;
1400 /* Pause for the tracing */
1401 atomic_t tracing_graph_pause;
1403 #ifdef CONFIG_TRACING
1404 /* state flags for use by tracers */
1405 unsigned long trace;
1410 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1411 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1412 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1413 * values are inverted: lower p->prio value means higher priority.
1415 * The MAX_USER_RT_PRIO value allows the actual maximum
1416 * RT priority to be separate from the value exported to
1417 * user-space. This allows kernel threads to set their
1418 * priority to a value higher than any user task. Note:
1419 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1422 #define MAX_USER_RT_PRIO 100
1423 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1425 #define MAX_PRIO (MAX_RT_PRIO + 40)
1426 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1428 static inline int rt_prio(int prio)
1430 if (unlikely(prio < MAX_RT_PRIO))
1435 static inline int rt_task(struct task_struct *p)
1437 return rt_prio(p->prio);
1440 static inline void set_task_session(struct task_struct *tsk, pid_t session)
1442 tsk->signal->__session = session;
1445 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1447 tsk->signal->__pgrp = pgrp;
1450 static inline struct pid *task_pid(struct task_struct *task)
1452 return task->pids[PIDTYPE_PID].pid;
1455 static inline struct pid *task_tgid(struct task_struct *task)
1457 return task->group_leader->pids[PIDTYPE_PID].pid;
1460 static inline struct pid *task_pgrp(struct task_struct *task)
1462 return task->group_leader->pids[PIDTYPE_PGID].pid;
1465 static inline struct pid *task_session(struct task_struct *task)
1467 return task->group_leader->pids[PIDTYPE_SID].pid;
1470 struct pid_namespace;
1473 * the helpers to get the task's different pids as they are seen
1474 * from various namespaces
1476 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1477 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1479 * task_xid_nr_ns() : id seen from the ns specified;
1481 * set_task_vxid() : assigns a virtual id to a task;
1483 * see also pid_nr() etc in include/linux/pid.h
1486 static inline pid_t task_pid_nr(struct task_struct *tsk)
1491 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1493 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1495 return pid_vnr(task_pid(tsk));
1499 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1504 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1506 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1508 return pid_vnr(task_tgid(tsk));
1512 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1514 return tsk->signal->__pgrp;
1517 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1519 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1521 return pid_vnr(task_pgrp(tsk));
1525 static inline pid_t task_session_nr(struct task_struct *tsk)
1527 return tsk->signal->__session;
1530 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1532 static inline pid_t task_session_vnr(struct task_struct *tsk)
1534 return pid_vnr(task_session(tsk));
1539 * pid_alive - check that a task structure is not stale
1540 * @p: Task structure to be checked.
1542 * Test if a process is not yet dead (at most zombie state)
1543 * If pid_alive fails, then pointers within the task structure
1544 * can be stale and must not be dereferenced.
1546 static inline int pid_alive(struct task_struct *p)
1548 return p->pids[PIDTYPE_PID].pid != NULL;
1552 * is_global_init - check if a task structure is init
1553 * @tsk: Task structure to be checked.
1555 * Check if a task structure is the first user space task the kernel created.
1557 static inline int is_global_init(struct task_struct *tsk)
1559 return tsk->pid == 1;
1563 * is_container_init:
1564 * check whether in the task is init in its own pid namespace.
1566 extern int is_container_init(struct task_struct *tsk);
1568 extern struct pid *cad_pid;
1570 extern void free_task(struct task_struct *tsk);
1571 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1573 extern void __put_task_struct(struct task_struct *t);
1575 static inline void put_task_struct(struct task_struct *t)
1577 if (atomic_dec_and_test(&t->usage))
1578 __put_task_struct(t);
1581 extern cputime_t task_utime(struct task_struct *p);
1582 extern cputime_t task_stime(struct task_struct *p);
1583 extern cputime_t task_gtime(struct task_struct *p);
1588 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1589 /* Not implemented yet, only for 486*/
1590 #define PF_STARTING 0x00000002 /* being created */
1591 #define PF_EXITING 0x00000004 /* getting shut down */
1592 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1593 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1594 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1595 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1596 #define PF_DUMPCORE 0x00000200 /* dumped core */
1597 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1598 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1599 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1600 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1601 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1602 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1603 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1604 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1605 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1606 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1607 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1608 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1609 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1610 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1611 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1612 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1613 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1614 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1615 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1616 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1619 * Only the _current_ task can read/write to tsk->flags, but other
1620 * tasks can access tsk->flags in readonly mode for example
1621 * with tsk_used_math (like during threaded core dumping).
1622 * There is however an exception to this rule during ptrace
1623 * or during fork: the ptracer task is allowed to write to the
1624 * child->flags of its traced child (same goes for fork, the parent
1625 * can write to the child->flags), because we're guaranteed the
1626 * child is not running and in turn not changing child->flags
1627 * at the same time the parent does it.
1629 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1630 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1631 #define clear_used_math() clear_stopped_child_used_math(current)
1632 #define set_used_math() set_stopped_child_used_math(current)
1633 #define conditional_stopped_child_used_math(condition, child) \
1634 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1635 #define conditional_used_math(condition) \
1636 conditional_stopped_child_used_math(condition, current)
1637 #define copy_to_stopped_child_used_math(child) \
1638 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1639 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1640 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1641 #define used_math() tsk_used_math(current)
1644 extern int set_cpus_allowed_ptr(struct task_struct *p,
1645 const struct cpumask *new_mask);
1647 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1648 const struct cpumask *new_mask)
1650 if (!cpumask_test_cpu(0, new_mask))
1655 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1657 return set_cpus_allowed_ptr(p, &new_mask);
1660 extern unsigned long long sched_clock(void);
1662 extern void sched_clock_init(void);
1663 extern u64 sched_clock_cpu(int cpu);
1665 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1666 static inline void sched_clock_tick(void)
1670 static inline void sched_clock_idle_sleep_event(void)
1674 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1678 extern void sched_clock_tick(void);
1679 extern void sched_clock_idle_sleep_event(void);
1680 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1684 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1685 * clock constructed from sched_clock():
1687 extern unsigned long long cpu_clock(int cpu);
1689 extern unsigned long long
1690 task_sched_runtime(struct task_struct *task);
1691 extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1693 /* sched_exec is called by processes performing an exec */
1695 extern void sched_exec(void);
1697 #define sched_exec() {}
1700 extern void sched_clock_idle_sleep_event(void);
1701 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1703 #ifdef CONFIG_HOTPLUG_CPU
1704 extern void idle_task_exit(void);
1706 static inline void idle_task_exit(void) {}
1709 extern void sched_idle_next(void);
1711 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1712 extern void wake_up_idle_cpu(int cpu);
1714 static inline void wake_up_idle_cpu(int cpu) { }
1717 extern unsigned int sysctl_sched_latency;
1718 extern unsigned int sysctl_sched_min_granularity;
1719 extern unsigned int sysctl_sched_wakeup_granularity;
1720 extern unsigned int sysctl_sched_shares_ratelimit;
1721 extern unsigned int sysctl_sched_shares_thresh;
1722 #ifdef CONFIG_SCHED_DEBUG
1723 extern unsigned int sysctl_sched_child_runs_first;
1724 extern unsigned int sysctl_sched_features;
1725 extern unsigned int sysctl_sched_migration_cost;
1726 extern unsigned int sysctl_sched_nr_migrate;
1728 int sched_nr_latency_handler(struct ctl_table *table, int write,
1729 struct file *file, void __user *buffer, size_t *length,
1732 extern unsigned int sysctl_sched_rt_period;
1733 extern int sysctl_sched_rt_runtime;
1735 int sched_rt_handler(struct ctl_table *table, int write,
1736 struct file *filp, void __user *buffer, size_t *lenp,
1739 extern unsigned int sysctl_sched_compat_yield;
1741 #ifdef CONFIG_RT_MUTEXES
1742 extern int rt_mutex_getprio(struct task_struct *p);
1743 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1744 extern void rt_mutex_adjust_pi(struct task_struct *p);
1746 static inline int rt_mutex_getprio(struct task_struct *p)
1748 return p->normal_prio;
1750 # define rt_mutex_adjust_pi(p) do { } while (0)
1753 extern void set_user_nice(struct task_struct *p, long nice);
1754 extern int task_prio(const struct task_struct *p);
1755 extern int task_nice(const struct task_struct *p);
1756 extern int can_nice(const struct task_struct *p, const int nice);
1757 extern int task_curr(const struct task_struct *p);
1758 extern int idle_cpu(int cpu);
1759 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1760 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1761 struct sched_param *);
1762 extern struct task_struct *idle_task(int cpu);
1763 extern struct task_struct *curr_task(int cpu);
1764 extern void set_curr_task(int cpu, struct task_struct *p);
1769 * The default (Linux) execution domain.
1771 extern struct exec_domain default_exec_domain;
1773 union thread_union {
1774 struct thread_info thread_info;
1775 unsigned long stack[THREAD_SIZE/sizeof(long)];
1778 #ifndef __HAVE_ARCH_KSTACK_END
1779 static inline int kstack_end(void *addr)
1781 /* Reliable end of stack detection:
1782 * Some APM bios versions misalign the stack
1784 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1788 extern union thread_union init_thread_union;
1789 extern struct task_struct init_task;
1791 extern struct mm_struct init_mm;
1793 extern struct pid_namespace init_pid_ns;
1796 * find a task by one of its numerical ids
1798 * find_task_by_pid_type_ns():
1799 * it is the most generic call - it finds a task by all id,
1800 * type and namespace specified
1801 * find_task_by_pid_ns():
1802 * finds a task by its pid in the specified namespace
1803 * find_task_by_vpid():
1804 * finds a task by its virtual pid
1806 * see also find_vpid() etc in include/linux/pid.h
1809 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1810 struct pid_namespace *ns);
1812 extern struct task_struct *find_task_by_vpid(pid_t nr);
1813 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1814 struct pid_namespace *ns);
1816 extern void __set_special_pids(struct pid *pid);
1818 /* per-UID process charging. */
1819 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1820 static inline struct user_struct *get_uid(struct user_struct *u)
1822 atomic_inc(&u->__count);
1825 extern void free_uid(struct user_struct *);
1826 extern void release_uids(struct user_namespace *ns);
1828 #include <asm/current.h>
1830 extern void do_timer(unsigned long ticks);
1832 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1833 extern int wake_up_process(struct task_struct *tsk);
1834 extern void wake_up_new_task(struct task_struct *tsk,
1835 unsigned long clone_flags);
1837 extern void kick_process(struct task_struct *tsk);
1839 static inline void kick_process(struct task_struct *tsk) { }
1841 extern void sched_fork(struct task_struct *p, int clone_flags);
1842 extern void sched_dead(struct task_struct *p);
1844 extern void proc_caches_init(void);
1845 extern void flush_signals(struct task_struct *);
1846 extern void ignore_signals(struct task_struct *);
1847 extern void flush_signal_handlers(struct task_struct *, int force_default);
1848 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1850 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1852 unsigned long flags;
1855 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1856 ret = dequeue_signal(tsk, mask, info);
1857 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1862 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1864 extern void unblock_all_signals(void);
1865 extern void release_task(struct task_struct * p);
1866 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1867 extern int force_sigsegv(int, struct task_struct *);
1868 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1869 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1870 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1871 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1872 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1873 extern int kill_pid(struct pid *pid, int sig, int priv);
1874 extern int kill_proc_info(int, struct siginfo *, pid_t);
1875 extern int do_notify_parent(struct task_struct *, int);
1876 extern void force_sig(int, struct task_struct *);
1877 extern void force_sig_specific(int, struct task_struct *);
1878 extern int send_sig(int, struct task_struct *, int);
1879 extern void zap_other_threads(struct task_struct *p);
1880 extern struct sigqueue *sigqueue_alloc(void);
1881 extern void sigqueue_free(struct sigqueue *);
1882 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
1883 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1884 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1886 static inline int kill_cad_pid(int sig, int priv)
1888 return kill_pid(cad_pid, sig, priv);
1891 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1892 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1893 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1894 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1896 static inline int is_si_special(const struct siginfo *info)
1898 return info <= SEND_SIG_FORCED;
1901 /* True if we are on the alternate signal stack. */
1903 static inline int on_sig_stack(unsigned long sp)
1905 return (sp - current->sas_ss_sp < current->sas_ss_size);
1908 static inline int sas_ss_flags(unsigned long sp)
1910 return (current->sas_ss_size == 0 ? SS_DISABLE
1911 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1915 * Routines for handling mm_structs
1917 extern struct mm_struct * mm_alloc(void);
1919 /* mmdrop drops the mm and the page tables */
1920 extern void __mmdrop(struct mm_struct *);
1921 static inline void mmdrop(struct mm_struct * mm)
1923 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1927 /* mmput gets rid of the mappings and all user-space */
1928 extern void mmput(struct mm_struct *);
1929 /* Grab a reference to a task's mm, if it is not already going away */
1930 extern struct mm_struct *get_task_mm(struct task_struct *task);
1931 /* Remove the current tasks stale references to the old mm_struct */
1932 extern void mm_release(struct task_struct *, struct mm_struct *);
1933 /* Allocate a new mm structure and copy contents from tsk->mm */
1934 extern struct mm_struct *dup_mm(struct task_struct *tsk);
1936 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1937 extern void flush_thread(void);
1938 extern void exit_thread(void);
1940 extern void exit_files(struct task_struct *);
1941 extern void __cleanup_signal(struct signal_struct *);
1942 extern void __cleanup_sighand(struct sighand_struct *);
1944 extern void exit_itimers(struct signal_struct *);
1945 extern void flush_itimer_signals(void);
1947 extern NORET_TYPE void do_group_exit(int);
1949 extern void daemonize(const char *, ...);
1950 extern int allow_signal(int);
1951 extern int disallow_signal(int);
1953 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1954 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1955 struct task_struct *fork_idle(int);
1957 extern void set_task_comm(struct task_struct *tsk, char *from);
1958 extern char *get_task_comm(char *to, struct task_struct *tsk);
1961 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
1963 static inline unsigned long wait_task_inactive(struct task_struct *p,
1970 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1972 #define for_each_process(p) \
1973 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1975 extern bool is_single_threaded(struct task_struct *);
1978 * Careful: do_each_thread/while_each_thread is a double loop so
1979 * 'break' will not work as expected - use goto instead.
1981 #define do_each_thread(g, t) \
1982 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1984 #define while_each_thread(g, t) \
1985 while ((t = next_thread(t)) != g)
1987 /* de_thread depends on thread_group_leader not being a pid based check */
1988 #define thread_group_leader(p) (p == p->group_leader)
1990 /* Do to the insanities of de_thread it is possible for a process
1991 * to have the pid of the thread group leader without actually being
1992 * the thread group leader. For iteration through the pids in proc
1993 * all we care about is that we have a task with the appropriate
1994 * pid, we don't actually care if we have the right task.
1996 static inline int has_group_leader_pid(struct task_struct *p)
1998 return p->pid == p->tgid;
2002 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2004 return p1->tgid == p2->tgid;
2007 static inline struct task_struct *next_thread(const struct task_struct *p)
2009 return list_entry(rcu_dereference(p->thread_group.next),
2010 struct task_struct, thread_group);
2013 static inline int thread_group_empty(struct task_struct *p)
2015 return list_empty(&p->thread_group);
2018 #define delay_group_leader(p) \
2019 (thread_group_leader(p) && !thread_group_empty(p))
2022 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2023 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2024 * pins the final release of task.io_context. Also protects ->cpuset and
2025 * ->cgroup.subsys[].
2027 * Nests both inside and outside of read_lock(&tasklist_lock).
2028 * It must not be nested with write_lock_irq(&tasklist_lock),
2029 * neither inside nor outside.
2031 static inline void task_lock(struct task_struct *p)
2033 spin_lock(&p->alloc_lock);
2036 static inline void task_unlock(struct task_struct *p)
2038 spin_unlock(&p->alloc_lock);
2041 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2042 unsigned long *flags);
2044 static inline void unlock_task_sighand(struct task_struct *tsk,
2045 unsigned long *flags)
2047 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2050 #ifndef __HAVE_THREAD_FUNCTIONS
2052 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2053 #define task_stack_page(task) ((task)->stack)
2055 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2057 *task_thread_info(p) = *task_thread_info(org);
2058 task_thread_info(p)->task = p;
2061 static inline unsigned long *end_of_stack(struct task_struct *p)
2063 return (unsigned long *)(task_thread_info(p) + 1);
2068 static inline int object_is_on_stack(void *obj)
2070 void *stack = task_stack_page(current);
2072 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2075 extern void thread_info_cache_init(void);
2077 #ifdef CONFIG_DEBUG_STACK_USAGE
2078 static inline unsigned long stack_not_used(struct task_struct *p)
2080 unsigned long *n = end_of_stack(p);
2082 do { /* Skip over canary */
2086 return (unsigned long)n - (unsigned long)end_of_stack(p);
2090 /* set thread flags in other task's structures
2091 * - see asm/thread_info.h for TIF_xxxx flags available
2093 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2095 set_ti_thread_flag(task_thread_info(tsk), flag);
2098 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2100 clear_ti_thread_flag(task_thread_info(tsk), flag);
2103 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2105 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2108 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2110 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2113 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2115 return test_ti_thread_flag(task_thread_info(tsk), flag);
2118 static inline void set_tsk_need_resched(struct task_struct *tsk)
2120 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2123 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2125 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2128 static inline int test_tsk_need_resched(struct task_struct *tsk)
2130 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2133 static inline int signal_pending(struct task_struct *p)
2135 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2138 extern int __fatal_signal_pending(struct task_struct *p);
2140 static inline int fatal_signal_pending(struct task_struct *p)
2142 return signal_pending(p) && __fatal_signal_pending(p);
2145 static inline int signal_pending_state(long state, struct task_struct *p)
2147 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2149 if (!signal_pending(p))
2152 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2155 static inline int need_resched(void)
2157 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2161 * cond_resched() and cond_resched_lock(): latency reduction via
2162 * explicit rescheduling in places that are safe. The return
2163 * value indicates whether a reschedule was done in fact.
2164 * cond_resched_lock() will drop the spinlock before scheduling,
2165 * cond_resched_softirq() will enable bhs before scheduling.
2167 extern int _cond_resched(void);
2168 #ifdef CONFIG_PREEMPT_BKL
2169 static inline int cond_resched(void)
2174 static inline int cond_resched(void)
2176 return _cond_resched();
2179 extern int cond_resched_lock(spinlock_t * lock);
2180 extern int cond_resched_softirq(void);
2181 static inline int cond_resched_bkl(void)
2183 return _cond_resched();
2187 * Does a critical section need to be broken due to another
2188 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2189 * but a general need for low latency)
2191 static inline int spin_needbreak(spinlock_t *lock)
2193 #ifdef CONFIG_PREEMPT
2194 return spin_is_contended(lock);
2201 * Thread group CPU time accounting.
2205 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
2207 struct task_cputime *totals = &tsk->signal->cputime.totals;
2208 unsigned long flags;
2210 spin_lock_irqsave(&totals->lock, flags);
2212 spin_unlock_irqrestore(&totals->lock, flags);
2215 static inline void thread_group_cputime_init(struct signal_struct *sig)
2217 sig->cputime.totals = (struct task_cputime){
2218 .utime = cputime_zero,
2219 .stime = cputime_zero,
2220 .sum_exec_runtime = 0,
2223 spin_lock_init(&sig->cputime.totals.lock);
2226 static inline void thread_group_cputime_free(struct signal_struct *sig)
2231 * Reevaluate whether the task has signals pending delivery.
2232 * Wake the task if so.
2233 * This is required every time the blocked sigset_t changes.
2234 * callers must hold sighand->siglock.
2236 extern void recalc_sigpending_and_wake(struct task_struct *t);
2237 extern void recalc_sigpending(void);
2239 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2242 * Wrappers for p->thread_info->cpu access. No-op on UP.
2246 static inline unsigned int task_cpu(const struct task_struct *p)
2248 return task_thread_info(p)->cpu;
2251 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2255 static inline unsigned int task_cpu(const struct task_struct *p)
2260 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2264 #endif /* CONFIG_SMP */
2266 extern void arch_pick_mmap_layout(struct mm_struct *mm);
2268 #ifdef CONFIG_TRACING
2270 __trace_special(void *__tr, void *__data,
2271 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2274 __trace_special(void *__tr, void *__data,
2275 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2280 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2281 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2283 extern void normalize_rt_tasks(void);
2285 #ifdef CONFIG_GROUP_SCHED
2287 extern struct task_group init_task_group;
2288 #ifdef CONFIG_USER_SCHED
2289 extern struct task_group root_task_group;
2290 extern void set_tg_uid(struct user_struct *user);
2293 extern struct task_group *sched_create_group(struct task_group *parent);
2294 extern void sched_destroy_group(struct task_group *tg);
2295 extern void sched_move_task(struct task_struct *tsk);
2296 #ifdef CONFIG_FAIR_GROUP_SCHED
2297 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2298 extern unsigned long sched_group_shares(struct task_group *tg);
2300 #ifdef CONFIG_RT_GROUP_SCHED
2301 extern int sched_group_set_rt_runtime(struct task_group *tg,
2302 long rt_runtime_us);
2303 extern long sched_group_rt_runtime(struct task_group *tg);
2304 extern int sched_group_set_rt_period(struct task_group *tg,
2306 extern long sched_group_rt_period(struct task_group *tg);
2310 #ifdef CONFIG_TASK_XACCT
2311 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2313 tsk->ioac.rchar += amt;
2316 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2318 tsk->ioac.wchar += amt;
2321 static inline void inc_syscr(struct task_struct *tsk)
2326 static inline void inc_syscw(struct task_struct *tsk)
2331 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2335 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2339 static inline void inc_syscr(struct task_struct *tsk)
2343 static inline void inc_syscw(struct task_struct *tsk)
2348 #ifndef TASK_SIZE_OF
2349 #define TASK_SIZE_OF(tsk) TASK_SIZE
2353 * Call the function if the target task is executing on a CPU right now:
2355 extern void task_oncpu_function_call(struct task_struct *p,
2356 void (*func) (void *info), void *info);
2359 #ifdef CONFIG_MM_OWNER
2360 extern void mm_update_next_owner(struct mm_struct *mm);
2361 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2363 static inline void mm_update_next_owner(struct mm_struct *mm)
2367 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2370 #endif /* CONFIG_MM_OWNER */
2372 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2374 #endif /* __KERNEL__ */