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
44 #include <asm/param.h> /* for HZ */
46 #include <linux/capability.h>
47 #include <linux/threads.h>
48 #include <linux/kernel.h>
49 #include <linux/types.h>
50 #include <linux/timex.h>
51 #include <linux/jiffies.h>
52 #include <linux/rbtree.h>
53 #include <linux/thread_info.h>
54 #include <linux/cpumask.h>
55 #include <linux/errno.h>
56 #include <linux/nodemask.h>
58 #include <asm/system.h>
59 #include <asm/semaphore.h>
61 #include <asm/ptrace.h>
63 #include <asm/cputime.h>
65 #include <linux/smp.h>
66 #include <linux/sem.h>
67 #include <linux/signal.h>
68 #include <linux/securebits.h>
69 #include <linux/fs_struct.h>
70 #include <linux/compiler.h>
71 #include <linux/completion.h>
72 #include <linux/pid.h>
73 #include <linux/percpu.h>
74 #include <linux/topology.h>
75 #include <linux/seccomp.h>
76 #include <linux/rcupdate.h>
77 #include <linux/futex.h>
78 #include <linux/rtmutex.h>
80 #include <linux/time.h>
81 #include <linux/param.h>
82 #include <linux/resource.h>
83 #include <linux/timer.h>
84 #include <linux/hrtimer.h>
85 #include <linux/task_io_accounting.h>
87 #include <asm/processor.h>
90 struct futex_pi_state
;
94 * List of flags we want to share for kernel threads,
95 * if only because they are not used by them anyway.
97 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
100 * These are the constant used to fake the fixed-point load-average
101 * counting. Some notes:
102 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
103 * a load-average precision of 10 bits integer + 11 bits fractional
104 * - if you want to count load-averages more often, you need more
105 * precision, or rounding will get you. With 2-second counting freq,
106 * the EXP_n values would be 1981, 2034 and 2043 if still using only
109 extern unsigned long avenrun
[]; /* Load averages */
111 #define FSHIFT 11 /* nr of bits of precision */
112 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
113 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
114 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
115 #define EXP_5 2014 /* 1/exp(5sec/5min) */
116 #define EXP_15 2037 /* 1/exp(5sec/15min) */
118 #define CALC_LOAD(load,exp,n) \
120 load += n*(FIXED_1-exp); \
123 extern unsigned long total_forks
;
124 extern int nr_threads
;
125 DECLARE_PER_CPU(unsigned long, process_counts
);
126 extern int nr_processes(void);
127 extern unsigned long nr_running(void);
128 extern unsigned long nr_uninterruptible(void);
129 extern unsigned long nr_active(void);
130 extern unsigned long nr_iowait(void);
131 extern unsigned long weighted_cpuload(const int cpu
);
135 * Task state bitmask. NOTE! These bits are also
136 * encoded in fs/proc/array.c: get_task_state().
138 * We have two separate sets of flags: task->state
139 * is about runnability, while task->exit_state are
140 * about the task exiting. Confusing, but this way
141 * modifying one set can't modify the other one by
144 #define TASK_RUNNING 0
145 #define TASK_INTERRUPTIBLE 1
146 #define TASK_UNINTERRUPTIBLE 2
147 #define TASK_STOPPED 4
148 #define TASK_TRACED 8
149 /* in tsk->exit_state */
150 #define EXIT_ZOMBIE 16
152 /* in tsk->state again */
153 #define TASK_NONINTERACTIVE 64
154 #define TASK_DEAD 128
156 #define task_is_traced(task) (((task)->state & TASK_TRACED) != 0)
157 #define task_is_stopped(task) (((task)->state & TASK_STOPPED) != 0)
158 #define task_is_dead(task) ((task)->exit_state != 0)
159 #define task_is_stopped_or_traced(task) \
160 (((task)->state & (TASK_STOPPED | TASK_TRACED)) != 0)
162 #define __set_task_state(tsk, state_value) \
163 do { (tsk)->state = (state_value); } while (0)
164 #define set_task_state(tsk, state_value) \
165 set_mb((tsk)->state, (state_value))
168 * set_current_state() includes a barrier so that the write of current->state
169 * is correctly serialised wrt the caller's subsequent test of whether to
172 * set_current_state(TASK_UNINTERRUPTIBLE);
173 * if (do_i_need_to_sleep())
176 * If the caller does not need such serialisation then use __set_current_state()
178 #define __set_current_state(state_value) \
179 do { current->state = (state_value); } while (0)
180 #define set_current_state(state_value) \
181 set_mb(current->state, (state_value))
183 /* Task command name length */
184 #define TASK_COMM_LEN 16
186 #include <linux/spinlock.h>
189 * This serializes "schedule()" and also protects
190 * the run-queue from deletions/modifications (but
191 * _adding_ to the beginning of the run-queue has
194 extern rwlock_t tasklist_lock
;
195 extern spinlock_t mmlist_lock
;
199 extern void sched_init(void);
200 extern void sched_init_smp(void);
201 extern void init_idle(struct task_struct
*idle
, int cpu
);
203 extern cpumask_t nohz_cpu_mask
;
204 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
205 extern int select_nohz_load_balancer(int cpu
);
207 static inline int select_nohz_load_balancer(int cpu
)
214 * Only dump TASK_* tasks. (0 for all tasks)
216 extern void show_state_filter(unsigned long state_filter
);
218 static inline void show_state(void)
220 show_state_filter(0);
223 extern void show_regs(struct pt_regs
*);
226 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
227 * task), SP is the stack pointer of the first frame that should be shown in the back
228 * trace (or NULL if the entire call-chain of the task should be shown).
230 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
232 void io_schedule(void);
233 long io_schedule_timeout(long timeout
);
235 extern void cpu_init (void);
236 extern void trap_init(void);
237 extern void update_process_times(int user
);
238 extern void scheduler_tick(void);
240 #ifdef CONFIG_DETECT_SOFTLOCKUP
241 extern void softlockup_tick(void);
242 extern void spawn_softlockup_task(void);
243 extern void touch_softlockup_watchdog(void);
244 extern void touch_all_softlockup_watchdogs(void);
246 static inline void softlockup_tick(void)
249 static inline void spawn_softlockup_task(void)
252 static inline void touch_softlockup_watchdog(void)
255 static inline void touch_all_softlockup_watchdogs(void)
261 /* Attach to any functions which should be ignored in wchan output. */
262 #define __sched __attribute__((__section__(".sched.text")))
263 /* Is this address in the __sched functions? */
264 extern int in_sched_functions(unsigned long addr
);
266 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
267 extern signed long FASTCALL(schedule_timeout(signed long timeout
));
268 extern signed long schedule_timeout_interruptible(signed long timeout
);
269 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
270 asmlinkage
void schedule(void);
274 /* Maximum number of active map areas.. This is a random (large) number */
275 #define DEFAULT_MAX_MAP_COUNT 65536
277 extern int sysctl_max_map_count
;
279 #include <linux/aio.h>
282 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
283 unsigned long, unsigned long);
285 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
286 unsigned long len
, unsigned long pgoff
,
287 unsigned long flags
);
288 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
289 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
291 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
293 * The mm counters are not protected by its page_table_lock,
294 * so must be incremented atomically.
296 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
297 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
298 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
299 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
300 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
301 typedef atomic_long_t mm_counter_t
;
303 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
305 * The mm counters are protected by its page_table_lock,
306 * so can be incremented directly.
308 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
309 #define get_mm_counter(mm, member) ((mm)->_##member)
310 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
311 #define inc_mm_counter(mm, member) (mm)->_##member++
312 #define dec_mm_counter(mm, member) (mm)->_##member--
313 typedef unsigned long mm_counter_t
;
315 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
317 #define get_mm_rss(mm) \
318 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
319 #define update_hiwater_rss(mm) do { \
320 unsigned long _rss = get_mm_rss(mm); \
321 if ((mm)->hiwater_rss < _rss) \
322 (mm)->hiwater_rss = _rss; \
324 #define update_hiwater_vm(mm) do { \
325 if ((mm)->hiwater_vm < (mm)->total_vm) \
326 (mm)->hiwater_vm = (mm)->total_vm; \
330 struct vm_area_struct
* mmap
; /* list of VMAs */
331 struct rb_root mm_rb
;
332 struct vm_area_struct
* mmap_cache
; /* last find_vma result */
333 unsigned long (*get_unmapped_area
) (struct file
*filp
,
334 unsigned long addr
, unsigned long len
,
335 unsigned long pgoff
, unsigned long flags
);
336 void (*unmap_area
) (struct mm_struct
*mm
, unsigned long addr
);
337 unsigned long mmap_base
; /* base of mmap area */
338 unsigned long task_size
; /* size of task vm space */
339 unsigned long cached_hole_size
; /* if non-zero, the largest hole below free_area_cache */
340 unsigned long free_area_cache
; /* first hole of size cached_hole_size or larger */
342 atomic_t mm_users
; /* How many users with user space? */
343 atomic_t mm_count
; /* How many references to "struct mm_struct" (users count as 1) */
344 int map_count
; /* number of VMAs */
345 struct rw_semaphore mmap_sem
;
346 spinlock_t page_table_lock
; /* Protects page tables and some counters */
348 struct list_head mmlist
; /* List of maybe swapped mm's. These are globally strung
349 * together off init_mm.mmlist, and are protected
353 /* Special counters, in some configurations protected by the
354 * page_table_lock, in other configurations by being atomic.
356 mm_counter_t _file_rss
;
357 mm_counter_t _anon_rss
;
359 unsigned long hiwater_rss
; /* High-watermark of RSS usage */
360 unsigned long hiwater_vm
; /* High-water virtual memory usage */
362 unsigned long total_vm
, locked_vm
, shared_vm
, exec_vm
;
363 unsigned long stack_vm
, reserved_vm
, def_flags
, nr_ptes
;
364 unsigned long start_code
, end_code
, start_data
, end_data
;
365 unsigned long start_brk
, brk
, start_stack
;
366 unsigned long arg_start
, arg_end
, env_start
, env_end
;
368 unsigned long saved_auxv
[AT_VECTOR_SIZE
]; /* for /proc/PID/auxv */
370 cpumask_t cpu_vm_mask
;
372 /* Architecture-specific MM context */
373 mm_context_t context
;
375 /* Swap token stuff */
377 * Last value of global fault stamp as seen by this process.
378 * In other words, this value gives an indication of how long
379 * it has been since this task got the token.
380 * Look at mm/thrash.c
382 unsigned int faultstamp
;
383 unsigned int token_priority
;
384 unsigned int last_interval
;
386 unsigned char dumpable
:2;
388 /* coredumping support */
390 struct completion
*core_startup_done
, core_done
;
393 rwlock_t ioctx_list_lock
;
394 struct kioctx
*ioctx_list
;
397 struct sighand_struct
{
399 struct k_sigaction action
[_NSIG
];
401 wait_queue_head_t signalfd_wqh
;
404 struct pacct_struct
{
407 unsigned long ac_mem
;
408 cputime_t ac_utime
, ac_stime
;
409 unsigned long ac_minflt
, ac_majflt
;
413 * NOTE! "signal_struct" does not have it's own
414 * locking, because a shared signal_struct always
415 * implies a shared sighand_struct, so locking
416 * sighand_struct is always a proper superset of
417 * the locking of signal_struct.
419 struct signal_struct
{
423 wait_queue_head_t wait_chldexit
; /* for wait4() */
425 /* current thread group signal load-balancing target: */
426 struct task_struct
*curr_target
;
428 /* shared signal handling: */
429 struct sigpending shared_pending
;
431 /* thread group exit support */
434 * - notify group_exit_task when ->count is equal to notify_count
435 * - everyone except group_exit_task is stopped during signal delivery
436 * of fatal signals, group_exit_task processes the signal.
438 struct task_struct
*group_exit_task
;
441 /* thread group stop support, overloads group_exit_code too */
442 int group_stop_count
;
443 unsigned int flags
; /* see SIGNAL_* flags below */
445 /* POSIX.1b Interval Timers */
446 struct list_head posix_timers
;
448 /* ITIMER_REAL timer for the process */
449 struct hrtimer real_timer
;
450 struct task_struct
*tsk
;
451 ktime_t it_real_incr
;
453 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
454 cputime_t it_prof_expires
, it_virt_expires
;
455 cputime_t it_prof_incr
, it_virt_incr
;
457 /* job control IDs */
459 struct pid
*tty_old_pgrp
;
462 pid_t session __deprecated
;
466 /* boolean value for session group leader */
469 struct tty_struct
*tty
; /* NULL if no tty */
472 * Cumulative resource counters for dead threads in the group,
473 * and for reaped dead child processes forked by this group.
474 * Live threads maintain their own counters and add to these
475 * in __exit_signal, except for the group leader.
477 cputime_t utime
, stime
, cutime
, cstime
;
478 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
479 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
480 unsigned long inblock
, oublock
, cinblock
, coublock
;
483 * Cumulative ns of scheduled CPU time for dead threads in the
484 * group, not including a zombie group leader. (This only differs
485 * from jiffies_to_ns(utime + stime) if sched_clock uses something
486 * other than jiffies.)
488 unsigned long long sched_time
;
491 * We don't bother to synchronize most readers of this at all,
492 * because there is no reader checking a limit that actually needs
493 * to get both rlim_cur and rlim_max atomically, and either one
494 * alone is a single word that can safely be read normally.
495 * getrlimit/setrlimit use task_lock(current->group_leader) to
496 * protect this instead of the siglock, because they really
497 * have no need to disable irqs.
499 struct rlimit rlim
[RLIM_NLIMITS
];
501 struct list_head cpu_timers
[3];
503 /* keep the process-shared keyrings here so that they do the right
504 * thing in threads created with CLONE_THREAD */
506 struct key
*session_keyring
; /* keyring inherited over fork */
507 struct key
*process_keyring
; /* keyring private to this process */
509 #ifdef CONFIG_BSD_PROCESS_ACCT
510 struct pacct_struct pacct
; /* per-process accounting information */
512 #ifdef CONFIG_TASKSTATS
513 struct taskstats
*stats
;
517 /* Context switch must be unlocked if interrupts are to be enabled */
518 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
519 # define __ARCH_WANT_UNLOCKED_CTXSW
523 * Bits in flags field of signal_struct.
525 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
526 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
527 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
528 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
532 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
533 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
534 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
535 * values are inverted: lower p->prio value means higher priority.
537 * The MAX_USER_RT_PRIO value allows the actual maximum
538 * RT priority to be separate from the value exported to
539 * user-space. This allows kernel threads to set their
540 * priority to a value higher than any user task. Note:
541 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
544 #define MAX_USER_RT_PRIO 100
545 #define MAX_RT_PRIO MAX_USER_RT_PRIO
547 #define MAX_PRIO (MAX_RT_PRIO + 40)
549 #define rt_prio(prio) unlikely((prio) < MAX_RT_PRIO)
550 #define rt_task(p) rt_prio((p)->prio)
551 #define batch_task(p) (unlikely((p)->policy == SCHED_BATCH))
552 #define is_rt_policy(p) ((p) != SCHED_NORMAL && (p) != SCHED_BATCH)
553 #define has_rt_policy(p) unlikely(is_rt_policy((p)->policy))
555 /* If true, all threads except ->group_exit_task have pending SIGKILL */
556 static inline int signal_group_exit(const struct signal_struct
*sig
)
558 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
559 (sig
->group_exit_task
!= NULL
);
563 * Some day this will be a full-fledged user tracking system..
566 atomic_t __count
; /* reference count */
567 atomic_t processes
; /* How many processes does this user have? */
568 atomic_t files
; /* How many open files does this user have? */
569 atomic_t sigpending
; /* How many pending signals does this user have? */
570 #ifdef CONFIG_INOTIFY_USER
571 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
572 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
574 /* protected by mq_lock */
575 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
576 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
579 struct key
*uid_keyring
; /* UID specific keyring */
580 struct key
*session_keyring
; /* UID's default session keyring */
583 /* Hash table maintenance information */
584 struct list_head uidhash_list
;
588 extern struct user_struct
*find_user(uid_t
);
590 extern struct user_struct root_user
;
591 #define INIT_USER (&root_user)
593 struct backing_dev_info
;
594 struct reclaim_state
;
596 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
598 /* cumulative counters */
599 unsigned long cpu_time
, /* time spent on the cpu */
600 run_delay
, /* time spent waiting on a runqueue */
601 pcnt
; /* # of timeslices run on this cpu */
604 unsigned long last_arrival
, /* when we last ran on a cpu */
605 last_queued
; /* when we were last queued to run */
607 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
609 #ifdef CONFIG_SCHEDSTATS
610 extern const struct file_operations proc_schedstat_operations
;
611 #endif /* CONFIG_SCHEDSTATS */
613 #ifdef CONFIG_TASK_DELAY_ACCT
614 struct task_delay_info
{
616 unsigned int flags
; /* Private per-task flags */
618 /* For each stat XXX, add following, aligned appropriately
620 * struct timespec XXX_start, XXX_end;
624 * Atomicity of updates to XXX_delay, XXX_count protected by
625 * single lock above (split into XXX_lock if contention is an issue).
629 * XXX_count is incremented on every XXX operation, the delay
630 * associated with the operation is added to XXX_delay.
631 * XXX_delay contains the accumulated delay time in nanoseconds.
633 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
634 u64 blkio_delay
; /* wait for sync block io completion */
635 u64 swapin_delay
; /* wait for swapin block io completion */
636 u32 blkio_count
; /* total count of the number of sync block */
637 /* io operations performed */
638 u32 swapin_count
; /* total count of the number of swapin block */
639 /* io operations performed */
641 #endif /* CONFIG_TASK_DELAY_ACCT */
643 static inline int sched_info_on(void)
645 #ifdef CONFIG_SCHEDSTATS
647 #elif defined(CONFIG_TASK_DELAY_ACCT)
648 extern int delayacct_on
;
664 * sched-domains (multiprocessor balancing) declarations:
666 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
669 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
670 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
671 #define SD_BALANCE_EXEC 4 /* Balance on exec */
672 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
673 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
674 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
675 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
676 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
677 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
678 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
679 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
681 #define BALANCE_FOR_MC_POWER \
682 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
684 #define BALANCE_FOR_PKG_POWER \
685 ((sched_mc_power_savings || sched_smt_power_savings) ? \
686 SD_POWERSAVINGS_BALANCE : 0)
688 #define test_sd_parent(sd, flag) ((sd->parent && \
689 (sd->parent->flags & flag)) ? 1 : 0)
693 struct sched_group
*next
; /* Must be a circular list */
697 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
698 * single CPU. This is read only (except for setup, hotplug CPU).
699 * Note : Never change cpu_power without recompute its reciprocal
701 unsigned int __cpu_power
;
703 * reciprocal value of cpu_power to avoid expensive divides
704 * (see include/linux/reciprocal_div.h)
706 u32 reciprocal_cpu_power
;
709 struct sched_domain
{
710 /* These fields must be setup */
711 struct sched_domain
*parent
; /* top domain must be null terminated */
712 struct sched_domain
*child
; /* bottom domain must be null terminated */
713 struct sched_group
*groups
; /* the balancing groups of the domain */
714 cpumask_t span
; /* span of all CPUs in this domain */
715 unsigned long min_interval
; /* Minimum balance interval ms */
716 unsigned long max_interval
; /* Maximum balance interval ms */
717 unsigned int busy_factor
; /* less balancing by factor if busy */
718 unsigned int imbalance_pct
; /* No balance until over watermark */
719 unsigned long long cache_hot_time
; /* Task considered cache hot (ns) */
720 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
721 unsigned int busy_idx
;
722 unsigned int idle_idx
;
723 unsigned int newidle_idx
;
724 unsigned int wake_idx
;
725 unsigned int forkexec_idx
;
726 int flags
; /* See SD_* */
728 /* Runtime fields. */
729 unsigned long last_balance
; /* init to jiffies. units in jiffies */
730 unsigned int balance_interval
; /* initialise to 1. units in ms. */
731 unsigned int nr_balance_failed
; /* initialise to 0 */
733 #ifdef CONFIG_SCHEDSTATS
734 /* load_balance() stats */
735 unsigned long lb_cnt
[MAX_IDLE_TYPES
];
736 unsigned long lb_failed
[MAX_IDLE_TYPES
];
737 unsigned long lb_balanced
[MAX_IDLE_TYPES
];
738 unsigned long lb_imbalance
[MAX_IDLE_TYPES
];
739 unsigned long lb_gained
[MAX_IDLE_TYPES
];
740 unsigned long lb_hot_gained
[MAX_IDLE_TYPES
];
741 unsigned long lb_nobusyg
[MAX_IDLE_TYPES
];
742 unsigned long lb_nobusyq
[MAX_IDLE_TYPES
];
744 /* Active load balancing */
745 unsigned long alb_cnt
;
746 unsigned long alb_failed
;
747 unsigned long alb_pushed
;
749 /* SD_BALANCE_EXEC stats */
750 unsigned long sbe_cnt
;
751 unsigned long sbe_balanced
;
752 unsigned long sbe_pushed
;
754 /* SD_BALANCE_FORK stats */
755 unsigned long sbf_cnt
;
756 unsigned long sbf_balanced
;
757 unsigned long sbf_pushed
;
759 /* try_to_wake_up() stats */
760 unsigned long ttwu_wake_remote
;
761 unsigned long ttwu_move_affine
;
762 unsigned long ttwu_move_balance
;
766 extern int partition_sched_domains(cpumask_t
*partition1
,
767 cpumask_t
*partition2
);
770 * Maximum cache size the migration-costs auto-tuning code will
773 extern unsigned int max_cache_size
;
775 #endif /* CONFIG_SMP */
778 struct io_context
; /* See blkdev.h */
781 #define NGROUPS_SMALL 32
782 #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
786 gid_t small_block
[NGROUPS_SMALL
];
792 * get_group_info() must be called with the owning task locked (via task_lock())
793 * when task != current. The reason being that the vast majority of callers are
794 * looking at current->group_info, which can not be changed except by the
795 * current task. Changing current->group_info requires the task lock, too.
797 #define get_group_info(group_info) do { \
798 atomic_inc(&(group_info)->usage); \
801 #define put_group_info(group_info) do { \
802 if (atomic_dec_and_test(&(group_info)->usage)) \
803 groups_free(group_info); \
806 extern struct group_info
*groups_alloc(int gidsetsize
);
807 extern void groups_free(struct group_info
*group_info
);
808 extern int set_current_groups(struct group_info
*group_info
);
809 extern int groups_search(struct group_info
*group_info
, gid_t grp
);
810 /* access the groups "array" with this macro */
811 #define GROUP_AT(gi, i) \
812 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
814 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
815 extern void prefetch_stack(struct task_struct
*t
);
817 static inline void prefetch_stack(struct task_struct
*t
) { }
820 struct audit_context
; /* See audit.c */
822 struct pipe_inode_info
;
823 struct uts_namespace
;
827 SLEEP_NONINTERACTIVE
,
835 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
838 unsigned int flags
; /* per process flags, defined below */
841 int lock_depth
; /* BKL lock depth */
844 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
848 int load_weight
; /* for niceness load balancing purposes */
849 int prio
, static_prio
, normal_prio
;
850 struct list_head run_list
;
851 struct prio_array
*array
;
853 unsigned short ioprio
;
854 #ifdef CONFIG_BLK_DEV_IO_TRACE
855 unsigned int btrace_seq
;
857 unsigned long sleep_avg
;
858 unsigned long long timestamp
, last_ran
;
859 unsigned long long sched_time
; /* sched_clock time spent running */
860 enum sleep_type sleep_type
;
863 cpumask_t cpus_allowed
;
864 unsigned int time_slice
, first_time_slice
;
866 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
867 struct sched_info sched_info
;
870 struct list_head tasks
;
872 * ptrace_list/ptrace_children forms the list of my children
873 * that were stolen by a ptracer.
875 struct list_head ptrace_children
;
876 struct list_head ptrace_list
;
878 struct mm_struct
*mm
, *active_mm
;
881 struct linux_binfmt
*binfmt
;
883 int exit_code
, exit_signal
;
884 int pdeath_signal
; /* The signal sent when the parent dies */
886 unsigned int personality
;
891 #ifdef CONFIG_CC_STACKPROTECTOR
892 /* Canary value for the -fstack-protector gcc feature */
893 unsigned long stack_canary
;
896 * pointers to (original) parent process, youngest child, younger sibling,
897 * older sibling, respectively. (p->father can be replaced with
900 struct task_struct
*real_parent
; /* real parent process (when being debugged) */
901 struct task_struct
*parent
; /* parent process */
903 * children/sibling forms the list of my children plus the
904 * tasks I'm ptracing.
906 struct list_head children
; /* list of my children */
907 struct list_head sibling
; /* linkage in my parent's children list */
908 struct task_struct
*group_leader
; /* threadgroup leader */
910 /* PID/PID hash table linkage. */
911 struct pid_link pids
[PIDTYPE_MAX
];
912 struct list_head thread_group
;
914 struct completion
*vfork_done
; /* for vfork() */
915 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
916 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
918 unsigned int rt_priority
;
919 cputime_t utime
, stime
;
920 unsigned long nvcsw
, nivcsw
; /* context switch counts */
921 struct timespec start_time
;
922 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
923 unsigned long min_flt
, maj_flt
;
925 cputime_t it_prof_expires
, it_virt_expires
;
926 unsigned long long it_sched_expires
;
927 struct list_head cpu_timers
[3];
929 /* process credentials */
930 uid_t uid
,euid
,suid
,fsuid
;
931 gid_t gid
,egid
,sgid
,fsgid
;
932 struct group_info
*group_info
;
933 kernel_cap_t cap_effective
, cap_inheritable
, cap_permitted
;
934 unsigned keep_capabilities
:1;
935 struct user_struct
*user
;
937 struct key
*request_key_auth
; /* assumed request_key authority */
938 struct key
*thread_keyring
; /* keyring private to this thread */
939 unsigned char jit_keyring
; /* default keyring to attach requested keys to */
942 * fpu_counter contains the number of consecutive context switches
943 * that the FPU is used. If this is over a threshold, the lazy fpu
944 * saving becomes unlazy to save the trap. This is an unsigned char
945 * so that after 256 times the counter wraps and the behavior turns
946 * lazy again; this to deal with bursty apps that only use FPU for
949 unsigned char fpu_counter
;
950 int oomkilladj
; /* OOM kill score adjustment (bit shift). */
951 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
952 - access with [gs]et_task_comm (which lock
954 - initialized normally by flush_old_exec */
955 /* file system info */
956 int link_count
, total_link_count
;
957 #ifdef CONFIG_SYSVIPC
959 struct sysv_sem sysvsem
;
961 /* CPU-specific state of this task */
962 struct thread_struct thread
;
963 /* filesystem information */
964 struct fs_struct
*fs
;
965 /* open file information */
966 struct files_struct
*files
;
968 struct nsproxy
*nsproxy
;
969 /* signal handlers */
970 struct signal_struct
*signal
;
971 struct sighand_struct
*sighand
;
973 sigset_t blocked
, real_blocked
;
974 sigset_t saved_sigmask
; /* To be restored with TIF_RESTORE_SIGMASK */
975 struct sigpending pending
;
977 unsigned long sas_ss_sp
;
979 int (*notifier
)(void *priv
);
981 sigset_t
*notifier_mask
;
984 struct audit_context
*audit_context
;
987 /* Thread group tracking */
990 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
991 spinlock_t alloc_lock
;
993 /* Protection of the PI data structures: */
996 #ifdef CONFIG_RT_MUTEXES
997 /* PI waiters blocked on a rt_mutex held by this task */
998 struct plist_head pi_waiters
;
999 /* Deadlock detection and priority inheritance handling */
1000 struct rt_mutex_waiter
*pi_blocked_on
;
1003 #ifdef CONFIG_DEBUG_MUTEXES
1004 /* mutex deadlock detection */
1005 struct mutex_waiter
*blocked_on
;
1007 #ifdef CONFIG_TRACE_IRQFLAGS
1008 unsigned int irq_events
;
1009 int hardirqs_enabled
;
1010 unsigned long hardirq_enable_ip
;
1011 unsigned int hardirq_enable_event
;
1012 unsigned long hardirq_disable_ip
;
1013 unsigned int hardirq_disable_event
;
1014 int softirqs_enabled
;
1015 unsigned long softirq_disable_ip
;
1016 unsigned int softirq_disable_event
;
1017 unsigned long softirq_enable_ip
;
1018 unsigned int softirq_enable_event
;
1019 int hardirq_context
;
1020 int softirq_context
;
1022 #ifdef CONFIG_LOCKDEP
1023 # define MAX_LOCK_DEPTH 30UL
1026 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1027 unsigned int lockdep_recursion
;
1030 /* journalling filesystem info */
1033 /* stacked block device info */
1034 struct bio
*bio_list
, **bio_tail
;
1037 struct reclaim_state
*reclaim_state
;
1039 struct backing_dev_info
*backing_dev_info
;
1041 struct io_context
*io_context
;
1043 unsigned long ptrace_message
;
1044 siginfo_t
*last_siginfo
; /* For ptrace use. */
1046 * current io wait handle: wait queue entry to use for io waits
1047 * If this thread is processing aio, this points at the waitqueue
1048 * inside the currently handled kiocb. It may be NULL (i.e. default
1049 * to a stack based synchronous wait) if its doing sync IO.
1051 wait_queue_t
*io_wait
;
1052 #ifdef CONFIG_TASK_XACCT
1053 /* i/o counters(bytes read/written, #syscalls */
1054 u64 rchar
, wchar
, syscr
, syscw
;
1056 struct task_io_accounting ioac
;
1057 #if defined(CONFIG_TASK_XACCT)
1058 u64 acct_rss_mem1
; /* accumulated rss usage */
1059 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1060 cputime_t acct_stimexpd
;/* stime since last update */
1063 struct mempolicy
*mempolicy
;
1066 #ifdef CONFIG_CPUSETS
1067 struct cpuset
*cpuset
;
1068 nodemask_t mems_allowed
;
1069 int cpuset_mems_generation
;
1070 int cpuset_mem_spread_rotor
;
1072 struct robust_list_head __user
*robust_list
;
1073 #ifdef CONFIG_COMPAT
1074 struct compat_robust_list_head __user
*compat_robust_list
;
1076 struct list_head pi_state_list
;
1077 struct futex_pi_state
*pi_state_cache
;
1079 atomic_t fs_excl
; /* holding fs exclusive resources */
1080 struct rcu_head rcu
;
1083 * cache last used pipe for splice
1085 struct pipe_inode_info
*splice_pipe
;
1086 #ifdef CONFIG_TASK_DELAY_ACCT
1087 struct task_delay_info
*delays
;
1089 #ifdef CONFIG_FAULT_INJECTION
1094 static inline pid_t
process_group(struct task_struct
*tsk
)
1096 return tsk
->signal
->pgrp
;
1099 static inline pid_t
signal_session(struct signal_struct
*sig
)
1101 return sig
->__session
;
1104 static inline pid_t
process_session(struct task_struct
*tsk
)
1106 return signal_session(tsk
->signal
);
1109 static inline void set_signal_session(struct signal_struct
*sig
, pid_t session
)
1111 sig
->__session
= session
;
1114 static inline struct pid
*task_pid(struct task_struct
*task
)
1116 return task
->pids
[PIDTYPE_PID
].pid
;
1119 static inline struct pid
*task_tgid(struct task_struct
*task
)
1121 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1124 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1126 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1129 static inline struct pid
*task_session(struct task_struct
*task
)
1131 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1135 * pid_alive - check that a task structure is not stale
1136 * @p: Task structure to be checked.
1138 * Test if a process is not yet dead (at most zombie state)
1139 * If pid_alive fails, then pointers within the task structure
1140 * can be stale and must not be dereferenced.
1142 static inline int pid_alive(struct task_struct
*p
)
1144 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1148 * is_init - check if a task structure is init
1149 * @tsk: Task structure to be checked.
1151 * Check if a task structure is the first user space task the kernel created.
1153 static inline int is_init(struct task_struct
*tsk
)
1155 return tsk
->pid
== 1;
1158 extern struct pid
*cad_pid
;
1160 extern void free_task(struct task_struct
*tsk
);
1161 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1163 extern void __put_task_struct(struct task_struct
*t
);
1165 static inline void put_task_struct(struct task_struct
*t
)
1167 if (atomic_dec_and_test(&t
->usage
))
1168 __put_task_struct(t
);
1174 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1175 /* Not implemented yet, only for 486*/
1176 #define PF_STARTING 0x00000002 /* being created */
1177 #define PF_EXITING 0x00000004 /* getting shut down */
1178 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1179 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1180 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1181 #define PF_DUMPCORE 0x00000200 /* dumped core */
1182 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1183 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1184 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1185 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1186 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1187 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1188 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1189 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1190 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1191 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1192 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1193 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1194 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1195 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1196 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1197 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1198 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1199 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1202 * Only the _current_ task can read/write to tsk->flags, but other
1203 * tasks can access tsk->flags in readonly mode for example
1204 * with tsk_used_math (like during threaded core dumping).
1205 * There is however an exception to this rule during ptrace
1206 * or during fork: the ptracer task is allowed to write to the
1207 * child->flags of its traced child (same goes for fork, the parent
1208 * can write to the child->flags), because we're guaranteed the
1209 * child is not running and in turn not changing child->flags
1210 * at the same time the parent does it.
1212 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1213 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1214 #define clear_used_math() clear_stopped_child_used_math(current)
1215 #define set_used_math() set_stopped_child_used_math(current)
1216 #define conditional_stopped_child_used_math(condition, child) \
1217 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1218 #define conditional_used_math(condition) \
1219 conditional_stopped_child_used_math(condition, current)
1220 #define copy_to_stopped_child_used_math(child) \
1221 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1222 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1223 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1224 #define used_math() tsk_used_math(current)
1227 extern int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
);
1229 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1231 if (!cpu_isset(0, new_mask
))
1237 extern unsigned long long sched_clock(void);
1238 extern unsigned long long
1239 current_sched_time(const struct task_struct
*current_task
);
1241 /* sched_exec is called by processes performing an exec */
1243 extern void sched_exec(void);
1245 #define sched_exec() {}
1248 #ifdef CONFIG_HOTPLUG_CPU
1249 extern void idle_task_exit(void);
1251 static inline void idle_task_exit(void) {}
1254 extern void sched_idle_next(void);
1256 #ifdef CONFIG_RT_MUTEXES
1257 extern int rt_mutex_getprio(struct task_struct
*p
);
1258 extern void rt_mutex_setprio(struct task_struct
*p
, int prio
);
1259 extern void rt_mutex_adjust_pi(struct task_struct
*p
);
1261 static inline int rt_mutex_getprio(struct task_struct
*p
)
1263 return p
->normal_prio
;
1265 # define rt_mutex_adjust_pi(p) do { } while (0)
1268 extern void set_user_nice(struct task_struct
*p
, long nice
);
1269 extern int task_prio(const struct task_struct
*p
);
1270 extern int task_nice(const struct task_struct
*p
);
1271 extern int can_nice(const struct task_struct
*p
, const int nice
);
1272 extern int task_curr(const struct task_struct
*p
);
1273 extern int idle_cpu(int cpu
);
1274 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
1275 extern struct task_struct
*idle_task(int cpu
);
1276 extern struct task_struct
*curr_task(int cpu
);
1277 extern void set_curr_task(int cpu
, struct task_struct
*p
);
1282 * The default (Linux) execution domain.
1284 extern struct exec_domain default_exec_domain
;
1286 union thread_union
{
1287 struct thread_info thread_info
;
1288 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1291 #ifndef __HAVE_ARCH_KSTACK_END
1292 static inline int kstack_end(void *addr
)
1294 /* Reliable end of stack detection:
1295 * Some APM bios versions misalign the stack
1297 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1301 extern union thread_union init_thread_union
;
1302 extern struct task_struct init_task
;
1304 extern struct mm_struct init_mm
;
1306 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1307 extern struct task_struct
*find_task_by_pid_type(int type
, int pid
);
1308 extern void __set_special_pids(pid_t session
, pid_t pgrp
);
1310 /* per-UID process charging. */
1311 extern struct user_struct
* alloc_uid(uid_t
);
1312 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1314 atomic_inc(&u
->__count
);
1317 extern void free_uid(struct user_struct
*);
1318 extern void switch_uid(struct user_struct
*);
1320 #include <asm/current.h>
1322 extern void do_timer(unsigned long ticks
);
1324 extern int FASTCALL(wake_up_state(struct task_struct
* tsk
, unsigned int state
));
1325 extern int FASTCALL(wake_up_process(struct task_struct
* tsk
));
1326 extern void FASTCALL(wake_up_new_task(struct task_struct
* tsk
,
1327 unsigned long clone_flags
));
1329 extern void kick_process(struct task_struct
*tsk
);
1331 static inline void kick_process(struct task_struct
*tsk
) { }
1333 extern void FASTCALL(sched_fork(struct task_struct
* p
, int clone_flags
));
1334 extern void FASTCALL(sched_exit(struct task_struct
* p
));
1336 extern int in_group_p(gid_t
);
1337 extern int in_egroup_p(gid_t
);
1339 extern void proc_caches_init(void);
1340 extern void flush_signals(struct task_struct
*);
1341 extern void ignore_signals(struct task_struct
*);
1342 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
1343 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
1345 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
1347 unsigned long flags
;
1350 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
1351 ret
= dequeue_signal(tsk
, mask
, info
);
1352 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
1357 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
1359 extern void unblock_all_signals(void);
1360 extern void release_task(struct task_struct
* p
);
1361 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
1362 extern int send_group_sig_info(int, struct siginfo
*, struct task_struct
*);
1363 extern int force_sigsegv(int, struct task_struct
*);
1364 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
1365 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
1366 extern int kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
1367 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
1368 extern int kill_pid_info_as_uid(int, struct siginfo
*, struct pid
*, uid_t
, uid_t
, u32
);
1369 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
1370 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
1371 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
1372 extern void do_notify_parent(struct task_struct
*, int);
1373 extern void force_sig(int, struct task_struct
*);
1374 extern void force_sig_specific(int, struct task_struct
*);
1375 extern int send_sig(int, struct task_struct
*, int);
1376 extern void zap_other_threads(struct task_struct
*p
);
1377 extern int kill_proc(pid_t
, int, int);
1378 extern struct sigqueue
*sigqueue_alloc(void);
1379 extern void sigqueue_free(struct sigqueue
*);
1380 extern int send_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1381 extern int send_group_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1382 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
1383 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
1385 static inline int kill_cad_pid(int sig
, int priv
)
1387 return kill_pid(cad_pid
, sig
, priv
);
1390 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1391 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1392 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1393 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1395 static inline int is_si_special(const struct siginfo
*info
)
1397 return info
<= SEND_SIG_FORCED
;
1400 /* True if we are on the alternate signal stack. */
1402 static inline int on_sig_stack(unsigned long sp
)
1404 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
1407 static inline int sas_ss_flags(unsigned long sp
)
1409 return (current
->sas_ss_size
== 0 ? SS_DISABLE
1410 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
1414 * Routines for handling mm_structs
1416 extern struct mm_struct
* mm_alloc(void);
1418 /* mmdrop drops the mm and the page tables */
1419 extern void FASTCALL(__mmdrop(struct mm_struct
*));
1420 static inline void mmdrop(struct mm_struct
* mm
)
1422 if (atomic_dec_and_test(&mm
->mm_count
))
1426 /* mmput gets rid of the mappings and all user-space */
1427 extern void mmput(struct mm_struct
*);
1428 /* Grab a reference to a task's mm, if it is not already going away */
1429 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
1430 /* Remove the current tasks stale references to the old mm_struct */
1431 extern void mm_release(struct task_struct
*, struct mm_struct
*);
1433 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct
*, struct pt_regs
*);
1434 extern void flush_thread(void);
1435 extern void exit_thread(void);
1437 extern void exit_files(struct task_struct
*);
1438 extern void __cleanup_signal(struct signal_struct
*);
1439 extern void __cleanup_sighand(struct sighand_struct
*);
1440 extern void exit_itimers(struct signal_struct
*);
1442 extern NORET_TYPE
void do_group_exit(int);
1444 extern void daemonize(const char *, ...);
1445 extern int allow_signal(int);
1446 extern int disallow_signal(int);
1448 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
1449 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
1450 struct task_struct
*fork_idle(int);
1452 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
1453 extern void get_task_comm(char *to
, struct task_struct
*tsk
);
1456 extern void wait_task_inactive(struct task_struct
* p
);
1458 #define wait_task_inactive(p) do { } while (0)
1461 #define remove_parent(p) list_del_init(&(p)->sibling)
1462 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1464 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1466 #define for_each_process(p) \
1467 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1470 * Careful: do_each_thread/while_each_thread is a double loop so
1471 * 'break' will not work as expected - use goto instead.
1473 #define do_each_thread(g, t) \
1474 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1476 #define while_each_thread(g, t) \
1477 while ((t = next_thread(t)) != g)
1479 /* de_thread depends on thread_group_leader not being a pid based check */
1480 #define thread_group_leader(p) (p == p->group_leader)
1482 /* Do to the insanities of de_thread it is possible for a process
1483 * to have the pid of the thread group leader without actually being
1484 * the thread group leader. For iteration through the pids in proc
1485 * all we care about is that we have a task with the appropriate
1486 * pid, we don't actually care if we have the right task.
1488 static inline int has_group_leader_pid(struct task_struct
*p
)
1490 return p
->pid
== p
->tgid
;
1493 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
1495 return list_entry(rcu_dereference(p
->thread_group
.next
),
1496 struct task_struct
, thread_group
);
1499 static inline int thread_group_empty(struct task_struct
*p
)
1501 return list_empty(&p
->thread_group
);
1504 #define delay_group_leader(p) \
1505 (thread_group_leader(p) && !thread_group_empty(p))
1508 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1509 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1510 * pins the final release of task.io_context. Also protects ->cpuset.
1512 * Nests both inside and outside of read_lock(&tasklist_lock).
1513 * It must not be nested with write_lock_irq(&tasklist_lock),
1514 * neither inside nor outside.
1516 static inline void task_lock(struct task_struct
*p
)
1518 spin_lock(&p
->alloc_lock
);
1521 static inline void task_unlock(struct task_struct
*p
)
1523 spin_unlock(&p
->alloc_lock
);
1526 extern struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
1527 unsigned long *flags
);
1529 static inline void unlock_task_sighand(struct task_struct
*tsk
,
1530 unsigned long *flags
)
1532 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
1535 #ifndef __HAVE_THREAD_FUNCTIONS
1537 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
1538 #define task_stack_page(task) ((task)->stack)
1540 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
1542 *task_thread_info(p
) = *task_thread_info(org
);
1543 task_thread_info(p
)->task
= p
;
1546 static inline unsigned long *end_of_stack(struct task_struct
*p
)
1548 return (unsigned long *)(task_thread_info(p
) + 1);
1553 /* set thread flags in other task's structures
1554 * - see asm/thread_info.h for TIF_xxxx flags available
1556 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1558 set_ti_thread_flag(task_thread_info(tsk
), flag
);
1561 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1563 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1566 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1568 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
1571 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1573 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1576 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1578 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
1581 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
1583 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1586 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
1588 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1591 static inline int restart_syscall(void)
1593 set_tsk_thread_flag(current
, TIF_SIGPENDING
);
1594 return -ERESTARTNOINTR
;
1597 static inline int signal_pending(struct task_struct
*p
)
1599 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
1602 static inline int need_resched(void)
1604 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
1608 * cond_resched() and cond_resched_lock(): latency reduction via
1609 * explicit rescheduling in places that are safe. The return
1610 * value indicates whether a reschedule was done in fact.
1611 * cond_resched_lock() will drop the spinlock before scheduling,
1612 * cond_resched_softirq() will enable bhs before scheduling.
1614 extern int cond_resched(void);
1615 extern int cond_resched_lock(spinlock_t
* lock
);
1616 extern int cond_resched_softirq(void);
1619 * Does a critical section need to be broken due to another
1622 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1623 # define need_lockbreak(lock) ((lock)->break_lock)
1625 # define need_lockbreak(lock) 0
1629 * Does a critical section need to be broken due to another
1630 * task waiting or preemption being signalled:
1632 static inline int lock_need_resched(spinlock_t
*lock
)
1634 if (need_lockbreak(lock
) || need_resched())
1640 * Reevaluate whether the task has signals pending delivery.
1641 * Wake the task if so.
1642 * This is required every time the blocked sigset_t changes.
1643 * callers must hold sighand->siglock.
1645 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
1646 extern void recalc_sigpending(void);
1648 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
1651 * Wrappers for p->thread_info->cpu access. No-op on UP.
1655 static inline unsigned int task_cpu(const struct task_struct
*p
)
1657 return task_thread_info(p
)->cpu
;
1660 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1662 task_thread_info(p
)->cpu
= cpu
;
1667 static inline unsigned int task_cpu(const struct task_struct
*p
)
1672 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1676 #endif /* CONFIG_SMP */
1678 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1679 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
1681 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
)
1683 mm
->mmap_base
= TASK_UNMAPPED_BASE
;
1684 mm
->get_unmapped_area
= arch_get_unmapped_area
;
1685 mm
->unmap_area
= arch_unmap_area
;
1689 extern long sched_setaffinity(pid_t pid
, cpumask_t new_mask
);
1690 extern long sched_getaffinity(pid_t pid
, cpumask_t
*mask
);
1692 extern int sched_mc_power_savings
, sched_smt_power_savings
;
1694 extern void normalize_rt_tasks(void);
1696 #ifdef CONFIG_TASK_XACCT
1697 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
1702 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
1707 static inline void inc_syscr(struct task_struct
*tsk
)
1712 static inline void inc_syscw(struct task_struct
*tsk
)
1717 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
1721 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
1725 static inline void inc_syscr(struct task_struct
*tsk
)
1729 static inline void inc_syscw(struct task_struct
*tsk
)
1734 #endif /* __KERNEL__ */