4 #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
9 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
10 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
11 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
12 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
13 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
14 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
15 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
16 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
17 #define CLONE_THREAD 0x00010000 /* Same thread group? */
18 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
19 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
20 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
21 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
22 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
23 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
24 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
25 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
26 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
27 #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
28 #define CLONE_NEWIPC 0x08000000 /* New ipcs */
33 #define SCHED_NORMAL 0
37 /* SCHED_ISO: reserved but not implemented yet */
46 #include <asm/param.h> /* for HZ */
48 #include <linux/capability.h>
49 #include <linux/threads.h>
50 #include <linux/kernel.h>
51 #include <linux/types.h>
52 #include <linux/timex.h>
53 #include <linux/jiffies.h>
54 #include <linux/rbtree.h>
55 #include <linux/thread_info.h>
56 #include <linux/cpumask.h>
57 #include <linux/errno.h>
58 #include <linux/nodemask.h>
60 #include <asm/system.h>
61 #include <asm/semaphore.h>
63 #include <asm/ptrace.h>
65 #include <asm/cputime.h>
67 #include <linux/smp.h>
68 #include <linux/sem.h>
69 #include <linux/signal.h>
70 #include <linux/securebits.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/seccomp.h>
78 #include <linux/rcupdate.h>
79 #include <linux/futex.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>
89 #include <asm/processor.h>
92 struct futex_pi_state
;
96 * List of flags we want to share for kernel threads,
97 * if only because they are not used by them anyway.
99 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
102 * These are the constant used to fake the fixed-point load-average
103 * counting. Some notes:
104 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
105 * a load-average precision of 10 bits integer + 11 bits fractional
106 * - if you want to count load-averages more often, you need more
107 * precision, or rounding will get you. With 2-second counting freq,
108 * the EXP_n values would be 1981, 2034 and 2043 if still using only
111 extern unsigned long avenrun
[]; /* Load averages */
113 #define FSHIFT 11 /* nr of bits of precision */
114 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
115 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
116 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
117 #define EXP_5 2014 /* 1/exp(5sec/5min) */
118 #define EXP_15 2037 /* 1/exp(5sec/15min) */
120 #define CALC_LOAD(load,exp,n) \
122 load += n*(FIXED_1-exp); \
125 extern unsigned long total_forks
;
126 extern int nr_threads
;
127 DECLARE_PER_CPU(unsigned long, process_counts
);
128 extern int nr_processes(void);
129 extern unsigned long nr_running(void);
130 extern unsigned long nr_uninterruptible(void);
131 extern unsigned long nr_active(void);
132 extern unsigned long nr_iowait(void);
133 extern unsigned long weighted_cpuload(const int cpu
);
137 * Task state bitmask. NOTE! These bits are also
138 * encoded in fs/proc/array.c: get_task_state().
140 * We have two separate sets of flags: task->state
141 * is about runnability, while task->exit_state are
142 * about the task exiting. Confusing, but this way
143 * modifying one set can't modify the other one by
146 #define TASK_RUNNING 0
147 #define TASK_INTERRUPTIBLE 1
148 #define TASK_UNINTERRUPTIBLE 2
149 #define TASK_STOPPED 4
150 #define TASK_TRACED 8
151 /* in tsk->exit_state */
152 #define EXIT_ZOMBIE 16
154 /* in tsk->state again */
155 #define TASK_NONINTERACTIVE 64
156 #define TASK_DEAD 128
158 #define __set_task_state(tsk, state_value) \
159 do { (tsk)->state = (state_value); } while (0)
160 #define set_task_state(tsk, state_value) \
161 set_mb((tsk)->state, (state_value))
164 * set_current_state() includes a barrier so that the write of current->state
165 * is correctly serialised wrt the caller's subsequent test of whether to
168 * set_current_state(TASK_UNINTERRUPTIBLE);
169 * if (do_i_need_to_sleep())
172 * If the caller does not need such serialisation then use __set_current_state()
174 #define __set_current_state(state_value) \
175 do { current->state = (state_value); } while (0)
176 #define set_current_state(state_value) \
177 set_mb(current->state, (state_value))
179 /* Task command name length */
180 #define TASK_COMM_LEN 16
182 #include <linux/spinlock.h>
185 * This serializes "schedule()" and also protects
186 * the run-queue from deletions/modifications (but
187 * _adding_ to the beginning of the run-queue has
190 extern rwlock_t tasklist_lock
;
191 extern spinlock_t mmlist_lock
;
195 extern void sched_init(void);
196 extern void sched_init_smp(void);
197 extern void init_idle(struct task_struct
*idle
, int cpu
);
198 extern void init_idle_bootup_task(struct task_struct
*idle
);
200 extern cpumask_t nohz_cpu_mask
;
201 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
202 extern int select_nohz_load_balancer(int cpu
);
204 static inline int select_nohz_load_balancer(int cpu
)
211 * Only dump TASK_* tasks. (0 for all tasks)
213 extern void show_state_filter(unsigned long state_filter
);
215 static inline void show_state(void)
217 show_state_filter(0);
220 extern void show_regs(struct pt_regs
*);
223 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
224 * task), SP is the stack pointer of the first frame that should be shown in the back
225 * trace (or NULL if the entire call-chain of the task should be shown).
227 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
229 void io_schedule(void);
230 long io_schedule_timeout(long timeout
);
232 extern void cpu_init (void);
233 extern void trap_init(void);
234 extern void update_process_times(int user
);
235 extern void scheduler_tick(void);
237 #ifdef CONFIG_DETECT_SOFTLOCKUP
238 extern void softlockup_tick(void);
239 extern void spawn_softlockup_task(void);
240 extern void touch_softlockup_watchdog(void);
241 extern void touch_all_softlockup_watchdogs(void);
243 static inline void softlockup_tick(void)
246 static inline void spawn_softlockup_task(void)
249 static inline void touch_softlockup_watchdog(void)
252 static inline void touch_all_softlockup_watchdogs(void)
258 /* Attach to any functions which should be ignored in wchan output. */
259 #define __sched __attribute__((__section__(".sched.text")))
260 /* Is this address in the __sched functions? */
261 extern int in_sched_functions(unsigned long addr
);
263 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
264 extern signed long FASTCALL(schedule_timeout(signed long timeout
));
265 extern signed long schedule_timeout_interruptible(signed long timeout
);
266 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
267 asmlinkage
void schedule(void);
271 /* Maximum number of active map areas.. This is a random (large) number */
272 #define DEFAULT_MAX_MAP_COUNT 65536
274 extern int sysctl_max_map_count
;
276 #include <linux/aio.h>
279 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
280 unsigned long, unsigned long);
282 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
283 unsigned long len
, unsigned long pgoff
,
284 unsigned long flags
);
285 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
286 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
288 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
290 * The mm counters are not protected by its page_table_lock,
291 * so must be incremented atomically.
293 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
294 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
295 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
296 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
297 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
298 typedef atomic_long_t mm_counter_t
;
300 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
302 * The mm counters are protected by its page_table_lock,
303 * so can be incremented directly.
305 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
306 #define get_mm_counter(mm, member) ((mm)->_##member)
307 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
308 #define inc_mm_counter(mm, member) (mm)->_##member++
309 #define dec_mm_counter(mm, member) (mm)->_##member--
310 typedef unsigned long mm_counter_t
;
312 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
314 #define get_mm_rss(mm) \
315 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
316 #define update_hiwater_rss(mm) do { \
317 unsigned long _rss = get_mm_rss(mm); \
318 if ((mm)->hiwater_rss < _rss) \
319 (mm)->hiwater_rss = _rss; \
321 #define update_hiwater_vm(mm) do { \
322 if ((mm)->hiwater_vm < (mm)->total_vm) \
323 (mm)->hiwater_vm = (mm)->total_vm; \
327 struct vm_area_struct
* mmap
; /* list of VMAs */
328 struct rb_root mm_rb
;
329 struct vm_area_struct
* mmap_cache
; /* last find_vma result */
330 unsigned long (*get_unmapped_area
) (struct file
*filp
,
331 unsigned long addr
, unsigned long len
,
332 unsigned long pgoff
, unsigned long flags
);
333 void (*unmap_area
) (struct mm_struct
*mm
, unsigned long addr
);
334 unsigned long mmap_base
; /* base of mmap area */
335 unsigned long task_size
; /* size of task vm space */
336 unsigned long cached_hole_size
; /* if non-zero, the largest hole below free_area_cache */
337 unsigned long free_area_cache
; /* first hole of size cached_hole_size or larger */
339 atomic_t mm_users
; /* How many users with user space? */
340 atomic_t mm_count
; /* How many references to "struct mm_struct" (users count as 1) */
341 int map_count
; /* number of VMAs */
342 struct rw_semaphore mmap_sem
;
343 spinlock_t page_table_lock
; /* Protects page tables and some counters */
345 struct list_head mmlist
; /* List of maybe swapped mm's. These are globally strung
346 * together off init_mm.mmlist, and are protected
350 /* Special counters, in some configurations protected by the
351 * page_table_lock, in other configurations by being atomic.
353 mm_counter_t _file_rss
;
354 mm_counter_t _anon_rss
;
356 unsigned long hiwater_rss
; /* High-watermark of RSS usage */
357 unsigned long hiwater_vm
; /* High-water virtual memory usage */
359 unsigned long total_vm
, locked_vm
, shared_vm
, exec_vm
;
360 unsigned long stack_vm
, reserved_vm
, def_flags
, nr_ptes
;
361 unsigned long start_code
, end_code
, start_data
, end_data
;
362 unsigned long start_brk
, brk
, start_stack
;
363 unsigned long arg_start
, arg_end
, env_start
, env_end
;
365 unsigned long saved_auxv
[AT_VECTOR_SIZE
]; /* for /proc/PID/auxv */
367 cpumask_t cpu_vm_mask
;
369 /* Architecture-specific MM context */
370 mm_context_t context
;
372 /* Swap token stuff */
374 * Last value of global fault stamp as seen by this process.
375 * In other words, this value gives an indication of how long
376 * it has been since this task got the token.
377 * Look at mm/thrash.c
379 unsigned int faultstamp
;
380 unsigned int token_priority
;
381 unsigned int last_interval
;
383 unsigned char dumpable
:2;
385 /* coredumping support */
387 struct completion
*core_startup_done
, core_done
;
390 rwlock_t ioctx_list_lock
;
391 struct kioctx
*ioctx_list
;
394 struct sighand_struct
{
396 struct k_sigaction action
[_NSIG
];
398 struct list_head signalfd_list
;
401 struct pacct_struct
{
404 unsigned long ac_mem
;
405 cputime_t ac_utime
, ac_stime
;
406 unsigned long ac_minflt
, ac_majflt
;
410 * NOTE! "signal_struct" does not have it's own
411 * locking, because a shared signal_struct always
412 * implies a shared sighand_struct, so locking
413 * sighand_struct is always a proper superset of
414 * the locking of signal_struct.
416 struct signal_struct
{
420 wait_queue_head_t wait_chldexit
; /* for wait4() */
422 /* current thread group signal load-balancing target: */
423 struct task_struct
*curr_target
;
425 /* shared signal handling: */
426 struct sigpending shared_pending
;
428 /* thread group exit support */
431 * - notify group_exit_task when ->count is equal to notify_count
432 * - everyone except group_exit_task is stopped during signal delivery
433 * of fatal signals, group_exit_task processes the signal.
435 struct task_struct
*group_exit_task
;
438 /* thread group stop support, overloads group_exit_code too */
439 int group_stop_count
;
440 unsigned int flags
; /* see SIGNAL_* flags below */
442 /* POSIX.1b Interval Timers */
443 struct list_head posix_timers
;
445 /* ITIMER_REAL timer for the process */
446 struct hrtimer real_timer
;
447 struct task_struct
*tsk
;
448 ktime_t it_real_incr
;
450 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
451 cputime_t it_prof_expires
, it_virt_expires
;
452 cputime_t it_prof_incr
, it_virt_incr
;
454 /* job control IDs */
456 struct pid
*tty_old_pgrp
;
459 pid_t session __deprecated
;
463 /* boolean value for session group leader */
466 struct tty_struct
*tty
; /* NULL if no tty */
469 * Cumulative resource counters for dead threads in the group,
470 * and for reaped dead child processes forked by this group.
471 * Live threads maintain their own counters and add to these
472 * in __exit_signal, except for the group leader.
474 cputime_t utime
, stime
, cutime
, cstime
;
475 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
476 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
477 unsigned long inblock
, oublock
, cinblock
, coublock
;
480 * Cumulative ns of scheduled CPU time for dead threads in the
481 * group, not including a zombie group leader. (This only differs
482 * from jiffies_to_ns(utime + stime) if sched_clock uses something
483 * other than jiffies.)
485 unsigned long long sum_sched_runtime
;
488 * We don't bother to synchronize most readers of this at all,
489 * because there is no reader checking a limit that actually needs
490 * to get both rlim_cur and rlim_max atomically, and either one
491 * alone is a single word that can safely be read normally.
492 * getrlimit/setrlimit use task_lock(current->group_leader) to
493 * protect this instead of the siglock, because they really
494 * have no need to disable irqs.
496 struct rlimit rlim
[RLIM_NLIMITS
];
498 struct list_head cpu_timers
[3];
500 /* keep the process-shared keyrings here so that they do the right
501 * thing in threads created with CLONE_THREAD */
503 struct key
*session_keyring
; /* keyring inherited over fork */
504 struct key
*process_keyring
; /* keyring private to this process */
506 #ifdef CONFIG_BSD_PROCESS_ACCT
507 struct pacct_struct pacct
; /* per-process accounting information */
509 #ifdef CONFIG_TASKSTATS
510 struct taskstats
*stats
;
514 /* Context switch must be unlocked if interrupts are to be enabled */
515 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
516 # define __ARCH_WANT_UNLOCKED_CTXSW
520 * Bits in flags field of signal_struct.
522 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
523 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
524 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
525 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
528 * Some day this will be a full-fledged user tracking system..
531 atomic_t __count
; /* reference count */
532 atomic_t processes
; /* How many processes does this user have? */
533 atomic_t files
; /* How many open files does this user have? */
534 atomic_t sigpending
; /* How many pending signals does this user have? */
535 #ifdef CONFIG_INOTIFY_USER
536 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
537 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
539 /* protected by mq_lock */
540 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
541 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
544 struct key
*uid_keyring
; /* UID specific keyring */
545 struct key
*session_keyring
; /* UID's default session keyring */
548 /* Hash table maintenance information */
549 struct list_head uidhash_list
;
553 extern struct user_struct
*find_user(uid_t
);
555 extern struct user_struct root_user
;
556 #define INIT_USER (&root_user)
558 struct backing_dev_info
;
559 struct reclaim_state
;
561 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
563 /* cumulative counters */
564 unsigned long pcnt
; /* # of times run on this cpu */
565 unsigned long long cpu_time
, /* time spent on the cpu */
566 run_delay
; /* time spent waiting on a runqueue */
569 unsigned long long last_arrival
,/* when we last ran on a cpu */
570 last_queued
; /* when we were last queued to run */
572 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
574 #ifdef CONFIG_SCHEDSTATS
575 extern const struct file_operations proc_schedstat_operations
;
576 #endif /* CONFIG_SCHEDSTATS */
578 #ifdef CONFIG_TASK_DELAY_ACCT
579 struct task_delay_info
{
581 unsigned int flags
; /* Private per-task flags */
583 /* For each stat XXX, add following, aligned appropriately
585 * struct timespec XXX_start, XXX_end;
589 * Atomicity of updates to XXX_delay, XXX_count protected by
590 * single lock above (split into XXX_lock if contention is an issue).
594 * XXX_count is incremented on every XXX operation, the delay
595 * associated with the operation is added to XXX_delay.
596 * XXX_delay contains the accumulated delay time in nanoseconds.
598 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
599 u64 blkio_delay
; /* wait for sync block io completion */
600 u64 swapin_delay
; /* wait for swapin block io completion */
601 u32 blkio_count
; /* total count of the number of sync block */
602 /* io operations performed */
603 u32 swapin_count
; /* total count of the number of swapin block */
604 /* io operations performed */
606 #endif /* CONFIG_TASK_DELAY_ACCT */
608 static inline int sched_info_on(void)
610 #ifdef CONFIG_SCHEDSTATS
612 #elif defined(CONFIG_TASK_DELAY_ACCT)
613 extern int delayacct_on
;
628 * sched-domains (multiprocessor balancing) declarations:
632 * Increase resolution of nice-level calculations:
634 #define SCHED_LOAD_SHIFT 10
635 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
637 #define SCHED_LOAD_SCALE_FUZZ (SCHED_LOAD_SCALE >> 5)
640 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
641 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
642 #define SD_BALANCE_EXEC 4 /* Balance on exec */
643 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
644 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
645 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
646 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
647 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
648 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
649 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
650 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
652 #define BALANCE_FOR_MC_POWER \
653 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
655 #define BALANCE_FOR_PKG_POWER \
656 ((sched_mc_power_savings || sched_smt_power_savings) ? \
657 SD_POWERSAVINGS_BALANCE : 0)
659 #define test_sd_parent(sd, flag) ((sd->parent && \
660 (sd->parent->flags & flag)) ? 1 : 0)
664 struct sched_group
*next
; /* Must be a circular list */
668 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
669 * single CPU. This is read only (except for setup, hotplug CPU).
670 * Note : Never change cpu_power without recompute its reciprocal
672 unsigned int __cpu_power
;
674 * reciprocal value of cpu_power to avoid expensive divides
675 * (see include/linux/reciprocal_div.h)
677 u32 reciprocal_cpu_power
;
680 struct sched_domain
{
681 /* These fields must be setup */
682 struct sched_domain
*parent
; /* top domain must be null terminated */
683 struct sched_domain
*child
; /* bottom domain must be null terminated */
684 struct sched_group
*groups
; /* the balancing groups of the domain */
685 cpumask_t span
; /* span of all CPUs in this domain */
686 unsigned long min_interval
; /* Minimum balance interval ms */
687 unsigned long max_interval
; /* Maximum balance interval ms */
688 unsigned int busy_factor
; /* less balancing by factor if busy */
689 unsigned int imbalance_pct
; /* No balance until over watermark */
690 unsigned long long cache_hot_time
; /* Task considered cache hot (ns) */
691 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
692 unsigned int busy_idx
;
693 unsigned int idle_idx
;
694 unsigned int newidle_idx
;
695 unsigned int wake_idx
;
696 unsigned int forkexec_idx
;
697 int flags
; /* See SD_* */
699 /* Runtime fields. */
700 unsigned long last_balance
; /* init to jiffies. units in jiffies */
701 unsigned int balance_interval
; /* initialise to 1. units in ms. */
702 unsigned int nr_balance_failed
; /* initialise to 0 */
704 #ifdef CONFIG_SCHEDSTATS
705 /* load_balance() stats */
706 unsigned long lb_cnt
[CPU_MAX_IDLE_TYPES
];
707 unsigned long lb_failed
[CPU_MAX_IDLE_TYPES
];
708 unsigned long lb_balanced
[CPU_MAX_IDLE_TYPES
];
709 unsigned long lb_imbalance
[CPU_MAX_IDLE_TYPES
];
710 unsigned long lb_gained
[CPU_MAX_IDLE_TYPES
];
711 unsigned long lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
712 unsigned long lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
713 unsigned long lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
715 /* Active load balancing */
716 unsigned long alb_cnt
;
717 unsigned long alb_failed
;
718 unsigned long alb_pushed
;
720 /* SD_BALANCE_EXEC stats */
721 unsigned long sbe_cnt
;
722 unsigned long sbe_balanced
;
723 unsigned long sbe_pushed
;
725 /* SD_BALANCE_FORK stats */
726 unsigned long sbf_cnt
;
727 unsigned long sbf_balanced
;
728 unsigned long sbf_pushed
;
730 /* try_to_wake_up() stats */
731 unsigned long ttwu_wake_remote
;
732 unsigned long ttwu_move_affine
;
733 unsigned long ttwu_move_balance
;
737 extern int partition_sched_domains(cpumask_t
*partition1
,
738 cpumask_t
*partition2
);
740 #endif /* CONFIG_SMP */
743 struct io_context
; /* See blkdev.h */
746 #define NGROUPS_SMALL 32
747 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
751 gid_t small_block
[NGROUPS_SMALL
];
757 * get_group_info() must be called with the owning task locked (via task_lock())
758 * when task != current. The reason being that the vast majority of callers are
759 * looking at current->group_info, which can not be changed except by the
760 * current task. Changing current->group_info requires the task lock, too.
762 #define get_group_info(group_info) do { \
763 atomic_inc(&(group_info)->usage); \
766 #define put_group_info(group_info) do { \
767 if (atomic_dec_and_test(&(group_info)->usage)) \
768 groups_free(group_info); \
771 extern struct group_info
*groups_alloc(int gidsetsize
);
772 extern void groups_free(struct group_info
*group_info
);
773 extern int set_current_groups(struct group_info
*group_info
);
774 extern int groups_search(struct group_info
*group_info
, gid_t grp
);
775 /* access the groups "array" with this macro */
776 #define GROUP_AT(gi, i) \
777 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
779 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
780 extern void prefetch_stack(struct task_struct
*t
);
782 static inline void prefetch_stack(struct task_struct
*t
) { }
785 struct audit_context
; /* See audit.c */
787 struct pipe_inode_info
;
788 struct uts_namespace
;
794 struct sched_class
*next
;
796 void (*enqueue_task
) (struct rq
*rq
, struct task_struct
*p
,
797 int wakeup
, u64 now
);
798 void (*dequeue_task
) (struct rq
*rq
, struct task_struct
*p
,
800 void (*yield_task
) (struct rq
*rq
, struct task_struct
*p
);
802 void (*check_preempt_curr
) (struct rq
*rq
, struct task_struct
*p
);
804 struct task_struct
* (*pick_next_task
) (struct rq
*rq
, u64 now
);
805 void (*put_prev_task
) (struct rq
*rq
, struct task_struct
*p
, u64 now
);
807 int (*load_balance
) (struct rq
*this_rq
, int this_cpu
,
809 unsigned long max_nr_move
, unsigned long max_load_move
,
810 struct sched_domain
*sd
, enum cpu_idle_type idle
,
811 int *all_pinned
, unsigned long *total_load_moved
);
813 void (*set_curr_task
) (struct rq
*rq
);
814 void (*task_tick
) (struct rq
*rq
, struct task_struct
*p
);
815 void (*task_new
) (struct rq
*rq
, struct task_struct
*p
);
819 unsigned long weight
, inv_weight
;
823 * CFS stats for a schedulable entity (task, task-group etc)
825 * Current field usage histogram:
830 * 4 se->sleep_start_fair
833 * 15 se->wait_runtime
835 struct sched_entity
{
837 unsigned long delta_fair_run
;
838 unsigned long delta_fair_sleep
;
839 unsigned long delta_exec
;
841 struct load_weight load
; /* for load-balancing */
842 struct rb_node run_node
;
849 u64 sleep_start_fair
;
857 u64 sum_exec_runtime
;
858 s64 sum_wait_runtime
;
859 s64 sum_sleep_runtime
;
860 unsigned long wait_runtime_overruns
;
861 unsigned long wait_runtime_underruns
;
862 #ifdef CONFIG_FAIR_GROUP_SCHED
863 struct sched_entity
*parent
;
864 /* rq on which this entity is (to be) queued: */
865 struct cfs_rq
*cfs_rq
;
866 /* rq "owned" by this entity/group: */
872 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
875 unsigned int flags
; /* per process flags, defined below */
878 int lock_depth
; /* BKL lock depth */
881 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
886 int prio
, static_prio
, normal_prio
;
887 struct list_head run_list
;
888 struct sched_class
*sched_class
;
889 struct sched_entity se
;
891 unsigned short ioprio
;
892 #ifdef CONFIG_BLK_DEV_IO_TRACE
893 unsigned int btrace_seq
;
897 cpumask_t cpus_allowed
;
898 unsigned int time_slice
;
900 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
901 struct sched_info sched_info
;
904 struct list_head tasks
;
906 * ptrace_list/ptrace_children forms the list of my children
907 * that were stolen by a ptracer.
909 struct list_head ptrace_children
;
910 struct list_head ptrace_list
;
912 struct mm_struct
*mm
, *active_mm
;
915 struct linux_binfmt
*binfmt
;
917 int exit_code
, exit_signal
;
918 int pdeath_signal
; /* The signal sent when the parent dies */
920 unsigned int personality
;
925 #ifdef CONFIG_CC_STACKPROTECTOR
926 /* Canary value for the -fstack-protector gcc feature */
927 unsigned long stack_canary
;
930 * pointers to (original) parent process, youngest child, younger sibling,
931 * older sibling, respectively. (p->father can be replaced with
934 struct task_struct
*real_parent
; /* real parent process (when being debugged) */
935 struct task_struct
*parent
; /* parent process */
937 * children/sibling forms the list of my children plus the
938 * tasks I'm ptracing.
940 struct list_head children
; /* list of my children */
941 struct list_head sibling
; /* linkage in my parent's children list */
942 struct task_struct
*group_leader
; /* threadgroup leader */
944 /* PID/PID hash table linkage. */
945 struct pid_link pids
[PIDTYPE_MAX
];
946 struct list_head thread_group
;
948 struct completion
*vfork_done
; /* for vfork() */
949 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
950 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
952 unsigned int rt_priority
;
953 cputime_t utime
, stime
;
954 unsigned long nvcsw
, nivcsw
; /* context switch counts */
955 struct timespec start_time
;
956 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
957 unsigned long min_flt
, maj_flt
;
959 cputime_t it_prof_expires
, it_virt_expires
;
960 unsigned long long it_sched_expires
;
961 struct list_head cpu_timers
[3];
963 /* process credentials */
964 uid_t uid
,euid
,suid
,fsuid
;
965 gid_t gid
,egid
,sgid
,fsgid
;
966 struct group_info
*group_info
;
967 kernel_cap_t cap_effective
, cap_inheritable
, cap_permitted
;
968 unsigned keep_capabilities
:1;
969 struct user_struct
*user
;
971 struct key
*request_key_auth
; /* assumed request_key authority */
972 struct key
*thread_keyring
; /* keyring private to this thread */
973 unsigned char jit_keyring
; /* default keyring to attach requested keys to */
976 * fpu_counter contains the number of consecutive context switches
977 * that the FPU is used. If this is over a threshold, the lazy fpu
978 * saving becomes unlazy to save the trap. This is an unsigned char
979 * so that after 256 times the counter wraps and the behavior turns
980 * lazy again; this to deal with bursty apps that only use FPU for
983 unsigned char fpu_counter
;
984 int oomkilladj
; /* OOM kill score adjustment (bit shift). */
985 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
986 - access with [gs]et_task_comm (which lock
988 - initialized normally by flush_old_exec */
989 /* file system info */
990 int link_count
, total_link_count
;
991 #ifdef CONFIG_SYSVIPC
993 struct sysv_sem sysvsem
;
995 /* CPU-specific state of this task */
996 struct thread_struct thread
;
997 /* filesystem information */
998 struct fs_struct
*fs
;
999 /* open file information */
1000 struct files_struct
*files
;
1002 struct nsproxy
*nsproxy
;
1003 /* signal handlers */
1004 struct signal_struct
*signal
;
1005 struct sighand_struct
*sighand
;
1007 sigset_t blocked
, real_blocked
;
1008 sigset_t saved_sigmask
; /* To be restored with TIF_RESTORE_SIGMASK */
1009 struct sigpending pending
;
1011 unsigned long sas_ss_sp
;
1013 int (*notifier
)(void *priv
);
1014 void *notifier_data
;
1015 sigset_t
*notifier_mask
;
1018 struct audit_context
*audit_context
;
1021 /* Thread group tracking */
1024 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1025 spinlock_t alloc_lock
;
1027 /* Protection of the PI data structures: */
1030 #ifdef CONFIG_RT_MUTEXES
1031 /* PI waiters blocked on a rt_mutex held by this task */
1032 struct plist_head pi_waiters
;
1033 /* Deadlock detection and priority inheritance handling */
1034 struct rt_mutex_waiter
*pi_blocked_on
;
1037 #ifdef CONFIG_DEBUG_MUTEXES
1038 /* mutex deadlock detection */
1039 struct mutex_waiter
*blocked_on
;
1041 #ifdef CONFIG_TRACE_IRQFLAGS
1042 unsigned int irq_events
;
1043 int hardirqs_enabled
;
1044 unsigned long hardirq_enable_ip
;
1045 unsigned int hardirq_enable_event
;
1046 unsigned long hardirq_disable_ip
;
1047 unsigned int hardirq_disable_event
;
1048 int softirqs_enabled
;
1049 unsigned long softirq_disable_ip
;
1050 unsigned int softirq_disable_event
;
1051 unsigned long softirq_enable_ip
;
1052 unsigned int softirq_enable_event
;
1053 int hardirq_context
;
1054 int softirq_context
;
1056 #ifdef CONFIG_LOCKDEP
1057 # define MAX_LOCK_DEPTH 30UL
1060 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1061 unsigned int lockdep_recursion
;
1064 /* journalling filesystem info */
1067 /* stacked block device info */
1068 struct bio
*bio_list
, **bio_tail
;
1071 struct reclaim_state
*reclaim_state
;
1073 struct backing_dev_info
*backing_dev_info
;
1075 struct io_context
*io_context
;
1077 unsigned long ptrace_message
;
1078 siginfo_t
*last_siginfo
; /* For ptrace use. */
1080 * current io wait handle: wait queue entry to use for io waits
1081 * If this thread is processing aio, this points at the waitqueue
1082 * inside the currently handled kiocb. It may be NULL (i.e. default
1083 * to a stack based synchronous wait) if its doing sync IO.
1085 wait_queue_t
*io_wait
;
1086 #ifdef CONFIG_TASK_XACCT
1087 /* i/o counters(bytes read/written, #syscalls */
1088 u64 rchar
, wchar
, syscr
, syscw
;
1090 struct task_io_accounting ioac
;
1091 #if defined(CONFIG_TASK_XACCT)
1092 u64 acct_rss_mem1
; /* accumulated rss usage */
1093 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1094 cputime_t acct_stimexpd
;/* stime since last update */
1097 struct mempolicy
*mempolicy
;
1100 #ifdef CONFIG_CPUSETS
1101 struct cpuset
*cpuset
;
1102 nodemask_t mems_allowed
;
1103 int cpuset_mems_generation
;
1104 int cpuset_mem_spread_rotor
;
1106 struct robust_list_head __user
*robust_list
;
1107 #ifdef CONFIG_COMPAT
1108 struct compat_robust_list_head __user
*compat_robust_list
;
1110 struct list_head pi_state_list
;
1111 struct futex_pi_state
*pi_state_cache
;
1113 atomic_t fs_excl
; /* holding fs exclusive resources */
1114 struct rcu_head rcu
;
1117 * cache last used pipe for splice
1119 struct pipe_inode_info
*splice_pipe
;
1120 #ifdef CONFIG_TASK_DELAY_ACCT
1121 struct task_delay_info
*delays
;
1123 #ifdef CONFIG_FAULT_INJECTION
1129 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1130 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1131 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1132 * values are inverted: lower p->prio value means higher priority.
1134 * The MAX_USER_RT_PRIO value allows the actual maximum
1135 * RT priority to be separate from the value exported to
1136 * user-space. This allows kernel threads to set their
1137 * priority to a value higher than any user task. Note:
1138 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1141 #define MAX_USER_RT_PRIO 100
1142 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1144 #define MAX_PRIO (MAX_RT_PRIO + 40)
1145 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1147 static inline int rt_prio(int prio
)
1149 if (unlikely(prio
< MAX_RT_PRIO
))
1154 static inline int rt_task(struct task_struct
*p
)
1156 return rt_prio(p
->prio
);
1159 static inline pid_t
process_group(struct task_struct
*tsk
)
1161 return tsk
->signal
->pgrp
;
1164 static inline pid_t
signal_session(struct signal_struct
*sig
)
1166 return sig
->__session
;
1169 static inline pid_t
process_session(struct task_struct
*tsk
)
1171 return signal_session(tsk
->signal
);
1174 static inline void set_signal_session(struct signal_struct
*sig
, pid_t session
)
1176 sig
->__session
= session
;
1179 static inline struct pid
*task_pid(struct task_struct
*task
)
1181 return task
->pids
[PIDTYPE_PID
].pid
;
1184 static inline struct pid
*task_tgid(struct task_struct
*task
)
1186 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1189 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1191 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1194 static inline struct pid
*task_session(struct task_struct
*task
)
1196 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1200 * pid_alive - check that a task structure is not stale
1201 * @p: Task structure to be checked.
1203 * Test if a process is not yet dead (at most zombie state)
1204 * If pid_alive fails, then pointers within the task structure
1205 * can be stale and must not be dereferenced.
1207 static inline int pid_alive(struct task_struct
*p
)
1209 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1213 * is_init - check if a task structure is init
1214 * @tsk: Task structure to be checked.
1216 * Check if a task structure is the first user space task the kernel created.
1218 static inline int is_init(struct task_struct
*tsk
)
1220 return tsk
->pid
== 1;
1223 extern struct pid
*cad_pid
;
1225 extern void free_task(struct task_struct
*tsk
);
1226 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1228 extern void __put_task_struct(struct task_struct
*t
);
1230 static inline void put_task_struct(struct task_struct
*t
)
1232 if (atomic_dec_and_test(&t
->usage
))
1233 __put_task_struct(t
);
1239 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1240 /* Not implemented yet, only for 486*/
1241 #define PF_STARTING 0x00000002 /* being created */
1242 #define PF_EXITING 0x00000004 /* getting shut down */
1243 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1244 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1245 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1246 #define PF_DUMPCORE 0x00000200 /* dumped core */
1247 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1248 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1249 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1250 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1251 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1252 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1253 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1254 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1255 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1256 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1257 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1258 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1259 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1260 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1261 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1262 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1263 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1264 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1267 * Only the _current_ task can read/write to tsk->flags, but other
1268 * tasks can access tsk->flags in readonly mode for example
1269 * with tsk_used_math (like during threaded core dumping).
1270 * There is however an exception to this rule during ptrace
1271 * or during fork: the ptracer task is allowed to write to the
1272 * child->flags of its traced child (same goes for fork, the parent
1273 * can write to the child->flags), because we're guaranteed the
1274 * child is not running and in turn not changing child->flags
1275 * at the same time the parent does it.
1277 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1278 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1279 #define clear_used_math() clear_stopped_child_used_math(current)
1280 #define set_used_math() set_stopped_child_used_math(current)
1281 #define conditional_stopped_child_used_math(condition, child) \
1282 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1283 #define conditional_used_math(condition) \
1284 conditional_stopped_child_used_math(condition, current)
1285 #define copy_to_stopped_child_used_math(child) \
1286 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1287 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1288 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1289 #define used_math() tsk_used_math(current)
1292 extern int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
);
1294 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1296 if (!cpu_isset(0, new_mask
))
1302 extern unsigned long long sched_clock(void);
1303 extern unsigned long long
1304 task_sched_runtime(struct task_struct
*task
);
1306 /* sched_exec is called by processes performing an exec */
1308 extern void sched_exec(void);
1310 #define sched_exec() {}
1313 extern void sched_clock_unstable_event(void);
1315 #ifdef CONFIG_HOTPLUG_CPU
1316 extern void idle_task_exit(void);
1318 static inline void idle_task_exit(void) {}
1321 extern void sched_idle_next(void);
1323 extern unsigned int sysctl_sched_granularity
;
1324 extern unsigned int sysctl_sched_wakeup_granularity
;
1325 extern unsigned int sysctl_sched_batch_wakeup_granularity
;
1326 extern unsigned int sysctl_sched_stat_granularity
;
1327 extern unsigned int sysctl_sched_runtime_limit
;
1328 extern unsigned int sysctl_sched_child_runs_first
;
1329 extern unsigned int sysctl_sched_features
;
1331 #ifdef CONFIG_RT_MUTEXES
1332 extern int rt_mutex_getprio(struct task_struct
*p
);
1333 extern void rt_mutex_setprio(struct task_struct
*p
, int prio
);
1334 extern void rt_mutex_adjust_pi(struct task_struct
*p
);
1336 static inline int rt_mutex_getprio(struct task_struct
*p
)
1338 return p
->normal_prio
;
1340 # define rt_mutex_adjust_pi(p) do { } while (0)
1343 extern void set_user_nice(struct task_struct
*p
, long nice
);
1344 extern int task_prio(const struct task_struct
*p
);
1345 extern int task_nice(const struct task_struct
*p
);
1346 extern int can_nice(const struct task_struct
*p
, const int nice
);
1347 extern int task_curr(const struct task_struct
*p
);
1348 extern int idle_cpu(int cpu
);
1349 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
1350 extern struct task_struct
*idle_task(int cpu
);
1351 extern struct task_struct
*curr_task(int cpu
);
1352 extern void set_curr_task(int cpu
, struct task_struct
*p
);
1357 * The default (Linux) execution domain.
1359 extern struct exec_domain default_exec_domain
;
1361 union thread_union
{
1362 struct thread_info thread_info
;
1363 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1366 #ifndef __HAVE_ARCH_KSTACK_END
1367 static inline int kstack_end(void *addr
)
1369 /* Reliable end of stack detection:
1370 * Some APM bios versions misalign the stack
1372 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1376 extern union thread_union init_thread_union
;
1377 extern struct task_struct init_task
;
1379 extern struct mm_struct init_mm
;
1381 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1382 extern struct task_struct
*find_task_by_pid_type(int type
, int pid
);
1383 extern void __set_special_pids(pid_t session
, pid_t pgrp
);
1385 /* per-UID process charging. */
1386 extern struct user_struct
* alloc_uid(uid_t
);
1387 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1389 atomic_inc(&u
->__count
);
1392 extern void free_uid(struct user_struct
*);
1393 extern void switch_uid(struct user_struct
*);
1395 #include <asm/current.h>
1397 extern void do_timer(unsigned long ticks
);
1399 extern int FASTCALL(wake_up_state(struct task_struct
* tsk
, unsigned int state
));
1400 extern int FASTCALL(wake_up_process(struct task_struct
* tsk
));
1401 extern void FASTCALL(wake_up_new_task(struct task_struct
* tsk
,
1402 unsigned long clone_flags
));
1404 extern void kick_process(struct task_struct
*tsk
);
1406 static inline void kick_process(struct task_struct
*tsk
) { }
1408 extern void sched_fork(struct task_struct
*p
, int clone_flags
);
1409 extern void sched_dead(struct task_struct
*p
);
1411 extern int in_group_p(gid_t
);
1412 extern int in_egroup_p(gid_t
);
1414 extern void proc_caches_init(void);
1415 extern void flush_signals(struct task_struct
*);
1416 extern void ignore_signals(struct task_struct
*);
1417 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
1418 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
1420 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
1422 unsigned long flags
;
1425 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
1426 ret
= dequeue_signal(tsk
, mask
, info
);
1427 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
1432 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
1434 extern void unblock_all_signals(void);
1435 extern void release_task(struct task_struct
* p
);
1436 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
1437 extern int send_group_sig_info(int, struct siginfo
*, struct task_struct
*);
1438 extern int force_sigsegv(int, struct task_struct
*);
1439 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
1440 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
1441 extern int kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
1442 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
1443 extern int kill_pid_info_as_uid(int, struct siginfo
*, struct pid
*, uid_t
, uid_t
, u32
);
1444 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
1445 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
1446 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
1447 extern void do_notify_parent(struct task_struct
*, int);
1448 extern void force_sig(int, struct task_struct
*);
1449 extern void force_sig_specific(int, struct task_struct
*);
1450 extern int send_sig(int, struct task_struct
*, int);
1451 extern void zap_other_threads(struct task_struct
*p
);
1452 extern int kill_proc(pid_t
, int, int);
1453 extern struct sigqueue
*sigqueue_alloc(void);
1454 extern void sigqueue_free(struct sigqueue
*);
1455 extern int send_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1456 extern int send_group_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1457 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
1458 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
1460 static inline int kill_cad_pid(int sig
, int priv
)
1462 return kill_pid(cad_pid
, sig
, priv
);
1465 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1466 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1467 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1468 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1470 static inline int is_si_special(const struct siginfo
*info
)
1472 return info
<= SEND_SIG_FORCED
;
1475 /* True if we are on the alternate signal stack. */
1477 static inline int on_sig_stack(unsigned long sp
)
1479 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
1482 static inline int sas_ss_flags(unsigned long sp
)
1484 return (current
->sas_ss_size
== 0 ? SS_DISABLE
1485 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
1489 * Routines for handling mm_structs
1491 extern struct mm_struct
* mm_alloc(void);
1493 /* mmdrop drops the mm and the page tables */
1494 extern void FASTCALL(__mmdrop(struct mm_struct
*));
1495 static inline void mmdrop(struct mm_struct
* mm
)
1497 if (atomic_dec_and_test(&mm
->mm_count
))
1501 /* mmput gets rid of the mappings and all user-space */
1502 extern void mmput(struct mm_struct
*);
1503 /* Grab a reference to a task's mm, if it is not already going away */
1504 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
1505 /* Remove the current tasks stale references to the old mm_struct */
1506 extern void mm_release(struct task_struct
*, struct mm_struct
*);
1508 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct
*, struct pt_regs
*);
1509 extern void flush_thread(void);
1510 extern void exit_thread(void);
1512 extern void exit_files(struct task_struct
*);
1513 extern void __cleanup_signal(struct signal_struct
*);
1514 extern void __cleanup_sighand(struct sighand_struct
*);
1515 extern void exit_itimers(struct signal_struct
*);
1517 extern NORET_TYPE
void do_group_exit(int);
1519 extern void daemonize(const char *, ...);
1520 extern int allow_signal(int);
1521 extern int disallow_signal(int);
1523 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
1524 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
1525 struct task_struct
*fork_idle(int);
1527 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
1528 extern void get_task_comm(char *to
, struct task_struct
*tsk
);
1531 extern void wait_task_inactive(struct task_struct
* p
);
1533 #define wait_task_inactive(p) do { } while (0)
1536 #define remove_parent(p) list_del_init(&(p)->sibling)
1537 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1539 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1541 #define for_each_process(p) \
1542 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1545 * Careful: do_each_thread/while_each_thread is a double loop so
1546 * 'break' will not work as expected - use goto instead.
1548 #define do_each_thread(g, t) \
1549 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1551 #define while_each_thread(g, t) \
1552 while ((t = next_thread(t)) != g)
1554 /* de_thread depends on thread_group_leader not being a pid based check */
1555 #define thread_group_leader(p) (p == p->group_leader)
1557 /* Do to the insanities of de_thread it is possible for a process
1558 * to have the pid of the thread group leader without actually being
1559 * the thread group leader. For iteration through the pids in proc
1560 * all we care about is that we have a task with the appropriate
1561 * pid, we don't actually care if we have the right task.
1563 static inline int has_group_leader_pid(struct task_struct
*p
)
1565 return p
->pid
== p
->tgid
;
1568 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
1570 return list_entry(rcu_dereference(p
->thread_group
.next
),
1571 struct task_struct
, thread_group
);
1574 static inline int thread_group_empty(struct task_struct
*p
)
1576 return list_empty(&p
->thread_group
);
1579 #define delay_group_leader(p) \
1580 (thread_group_leader(p) && !thread_group_empty(p))
1583 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1584 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1585 * pins the final release of task.io_context. Also protects ->cpuset.
1587 * Nests both inside and outside of read_lock(&tasklist_lock).
1588 * It must not be nested with write_lock_irq(&tasklist_lock),
1589 * neither inside nor outside.
1591 static inline void task_lock(struct task_struct
*p
)
1593 spin_lock(&p
->alloc_lock
);
1596 static inline void task_unlock(struct task_struct
*p
)
1598 spin_unlock(&p
->alloc_lock
);
1601 extern struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
1602 unsigned long *flags
);
1604 static inline void unlock_task_sighand(struct task_struct
*tsk
,
1605 unsigned long *flags
)
1607 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
1610 #ifndef __HAVE_THREAD_FUNCTIONS
1612 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
1613 #define task_stack_page(task) ((task)->stack)
1615 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
1617 *task_thread_info(p
) = *task_thread_info(org
);
1618 task_thread_info(p
)->task
= p
;
1621 static inline unsigned long *end_of_stack(struct task_struct
*p
)
1623 return (unsigned long *)(task_thread_info(p
) + 1);
1628 /* set thread flags in other task's structures
1629 * - see asm/thread_info.h for TIF_xxxx flags available
1631 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1633 set_ti_thread_flag(task_thread_info(tsk
), flag
);
1636 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1638 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1641 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1643 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
1646 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1648 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1651 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1653 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
1656 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
1658 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1661 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
1663 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1666 static inline int signal_pending(struct task_struct
*p
)
1668 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
1671 static inline int need_resched(void)
1673 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
1677 * cond_resched() and cond_resched_lock(): latency reduction via
1678 * explicit rescheduling in places that are safe. The return
1679 * value indicates whether a reschedule was done in fact.
1680 * cond_resched_lock() will drop the spinlock before scheduling,
1681 * cond_resched_softirq() will enable bhs before scheduling.
1683 extern int cond_resched(void);
1684 extern int cond_resched_lock(spinlock_t
* lock
);
1685 extern int cond_resched_softirq(void);
1688 * Does a critical section need to be broken due to another
1691 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1692 # define need_lockbreak(lock) ((lock)->break_lock)
1694 # define need_lockbreak(lock) 0
1698 * Does a critical section need to be broken due to another
1699 * task waiting or preemption being signalled:
1701 static inline int lock_need_resched(spinlock_t
*lock
)
1703 if (need_lockbreak(lock
) || need_resched())
1709 * Reevaluate whether the task has signals pending delivery.
1710 * Wake the task if so.
1711 * This is required every time the blocked sigset_t changes.
1712 * callers must hold sighand->siglock.
1714 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
1715 extern void recalc_sigpending(void);
1717 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
1720 * Wrappers for p->thread_info->cpu access. No-op on UP.
1724 static inline unsigned int task_cpu(const struct task_struct
*p
)
1726 return task_thread_info(p
)->cpu
;
1729 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
1733 static inline unsigned int task_cpu(const struct task_struct
*p
)
1738 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1742 #endif /* CONFIG_SMP */
1744 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1745 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
1747 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
)
1749 mm
->mmap_base
= TASK_UNMAPPED_BASE
;
1750 mm
->get_unmapped_area
= arch_get_unmapped_area
;
1751 mm
->unmap_area
= arch_unmap_area
;
1755 extern long sched_setaffinity(pid_t pid
, cpumask_t new_mask
);
1756 extern long sched_getaffinity(pid_t pid
, cpumask_t
*mask
);
1758 extern int sched_mc_power_savings
, sched_smt_power_savings
;
1760 extern void normalize_rt_tasks(void);
1762 #ifdef CONFIG_TASK_XACCT
1763 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
1768 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
1773 static inline void inc_syscr(struct task_struct
*tsk
)
1778 static inline void inc_syscw(struct task_struct
*tsk
)
1783 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
1787 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
1791 static inline void inc_syscr(struct task_struct
*tsk
)
1795 static inline void inc_syscw(struct task_struct
*tsk
)
1800 #endif /* __KERNEL__ */