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 */
31 #define SCHED_NORMAL 0
42 #include <asm/param.h> /* for HZ */
44 #include <linux/capability.h>
45 #include <linux/threads.h>
46 #include <linux/kernel.h>
47 #include <linux/types.h>
48 #include <linux/timex.h>
49 #include <linux/jiffies.h>
50 #include <linux/rbtree.h>
51 #include <linux/thread_info.h>
52 #include <linux/cpumask.h>
53 #include <linux/errno.h>
54 #include <linux/nodemask.h>
56 #include <asm/system.h>
57 #include <asm/semaphore.h>
59 #include <asm/ptrace.h>
61 #include <asm/cputime.h>
63 #include <linux/smp.h>
64 #include <linux/sem.h>
65 #include <linux/signal.h>
66 #include <linux/securebits.h>
67 #include <linux/fs_struct.h>
68 #include <linux/compiler.h>
69 #include <linux/completion.h>
70 #include <linux/pid.h>
71 #include <linux/percpu.h>
72 #include <linux/topology.h>
73 #include <linux/seccomp.h>
74 #include <linux/rcupdate.h>
75 #include <linux/futex.h>
76 #include <linux/rtmutex.h>
78 #include <linux/time.h>
79 #include <linux/param.h>
80 #include <linux/resource.h>
81 #include <linux/timer.h>
82 #include <linux/hrtimer.h>
84 #include <asm/processor.h>
87 struct futex_pi_state
;
90 * List of flags we want to share for kernel threads,
91 * if only because they are not used by them anyway.
93 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
96 * These are the constant used to fake the fixed-point load-average
97 * counting. Some notes:
98 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
99 * a load-average precision of 10 bits integer + 11 bits fractional
100 * - if you want to count load-averages more often, you need more
101 * precision, or rounding will get you. With 2-second counting freq,
102 * the EXP_n values would be 1981, 2034 and 2043 if still using only
105 extern unsigned long avenrun
[]; /* Load averages */
107 #define FSHIFT 11 /* nr of bits of precision */
108 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
109 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
110 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
111 #define EXP_5 2014 /* 1/exp(5sec/5min) */
112 #define EXP_15 2037 /* 1/exp(5sec/15min) */
114 #define CALC_LOAD(load,exp,n) \
116 load += n*(FIXED_1-exp); \
119 extern unsigned long total_forks
;
120 extern int nr_threads
;
122 DECLARE_PER_CPU(unsigned long, process_counts
);
123 extern int nr_processes(void);
124 extern unsigned long nr_running(void);
125 extern unsigned long nr_uninterruptible(void);
126 extern unsigned long nr_active(void);
127 extern unsigned long nr_iowait(void);
128 extern unsigned long weighted_cpuload(const int cpu
);
132 * Task state bitmask. NOTE! These bits are also
133 * encoded in fs/proc/array.c: get_task_state().
135 * We have two separate sets of flags: task->state
136 * is about runnability, while task->exit_state are
137 * about the task exiting. Confusing, but this way
138 * modifying one set can't modify the other one by
141 #define TASK_RUNNING 0
142 #define TASK_INTERRUPTIBLE 1
143 #define TASK_UNINTERRUPTIBLE 2
144 #define TASK_STOPPED 4
145 #define TASK_TRACED 8
146 /* in tsk->exit_state */
147 #define EXIT_ZOMBIE 16
149 /* in tsk->state again */
150 #define TASK_NONINTERACTIVE 64
152 #define __set_task_state(tsk, state_value) \
153 do { (tsk)->state = (state_value); } while (0)
154 #define set_task_state(tsk, state_value) \
155 set_mb((tsk)->state, (state_value))
158 * set_current_state() includes a barrier so that the write of current->state
159 * is correctly serialised wrt the caller's subsequent test of whether to
162 * set_current_state(TASK_UNINTERRUPTIBLE);
163 * if (do_i_need_to_sleep())
166 * If the caller does not need such serialisation then use __set_current_state()
168 #define __set_current_state(state_value) \
169 do { current->state = (state_value); } while (0)
170 #define set_current_state(state_value) \
171 set_mb(current->state, (state_value))
173 /* Task command name length */
174 #define TASK_COMM_LEN 16
176 #include <linux/spinlock.h>
179 * This serializes "schedule()" and also protects
180 * the run-queue from deletions/modifications (but
181 * _adding_ to the beginning of the run-queue has
184 extern rwlock_t tasklist_lock
;
185 extern spinlock_t mmlist_lock
;
189 extern void sched_init(void);
190 extern void sched_init_smp(void);
191 extern void init_idle(struct task_struct
*idle
, int cpu
);
193 extern cpumask_t nohz_cpu_mask
;
195 extern void show_state(void);
196 extern void show_regs(struct pt_regs
*);
199 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
200 * task), SP is the stack pointer of the first frame that should be shown in the back
201 * trace (or NULL if the entire call-chain of the task should be shown).
203 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
205 void io_schedule(void);
206 long io_schedule_timeout(long timeout
);
208 extern void cpu_init (void);
209 extern void trap_init(void);
210 extern void update_process_times(int user
);
211 extern void scheduler_tick(void);
213 #ifdef CONFIG_DETECT_SOFTLOCKUP
214 extern void softlockup_tick(void);
215 extern void spawn_softlockup_task(void);
216 extern void touch_softlockup_watchdog(void);
218 static inline void softlockup_tick(void)
221 static inline void spawn_softlockup_task(void)
224 static inline void touch_softlockup_watchdog(void)
230 /* Attach to any functions which should be ignored in wchan output. */
231 #define __sched __attribute__((__section__(".sched.text")))
232 /* Is this address in the __sched functions? */
233 extern int in_sched_functions(unsigned long addr
);
235 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
236 extern signed long FASTCALL(schedule_timeout(signed long timeout
));
237 extern signed long schedule_timeout_interruptible(signed long timeout
);
238 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
239 asmlinkage
void schedule(void);
243 /* Maximum number of active map areas.. This is a random (large) number */
244 #define DEFAULT_MAX_MAP_COUNT 65536
246 extern int sysctl_max_map_count
;
248 #include <linux/aio.h>
251 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
252 unsigned long, unsigned long);
254 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
255 unsigned long len
, unsigned long pgoff
,
256 unsigned long flags
);
257 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
258 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
260 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
262 * The mm counters are not protected by its page_table_lock,
263 * so must be incremented atomically.
265 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
266 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
267 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
268 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
269 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
270 typedef atomic_long_t mm_counter_t
;
272 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
274 * The mm counters are protected by its page_table_lock,
275 * so can be incremented directly.
277 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
278 #define get_mm_counter(mm, member) ((mm)->_##member)
279 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
280 #define inc_mm_counter(mm, member) (mm)->_##member++
281 #define dec_mm_counter(mm, member) (mm)->_##member--
282 typedef unsigned long mm_counter_t
;
284 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
286 #define get_mm_rss(mm) \
287 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
288 #define update_hiwater_rss(mm) do { \
289 unsigned long _rss = get_mm_rss(mm); \
290 if ((mm)->hiwater_rss < _rss) \
291 (mm)->hiwater_rss = _rss; \
293 #define update_hiwater_vm(mm) do { \
294 if ((mm)->hiwater_vm < (mm)->total_vm) \
295 (mm)->hiwater_vm = (mm)->total_vm; \
299 struct vm_area_struct
* mmap
; /* list of VMAs */
300 struct rb_root mm_rb
;
301 struct vm_area_struct
* mmap_cache
; /* last find_vma result */
302 unsigned long (*get_unmapped_area
) (struct file
*filp
,
303 unsigned long addr
, unsigned long len
,
304 unsigned long pgoff
, unsigned long flags
);
305 void (*unmap_area
) (struct mm_struct
*mm
, unsigned long addr
);
306 unsigned long mmap_base
; /* base of mmap area */
307 unsigned long task_size
; /* size of task vm space */
308 unsigned long cached_hole_size
; /* if non-zero, the largest hole below free_area_cache */
309 unsigned long free_area_cache
; /* first hole of size cached_hole_size or larger */
311 atomic_t mm_users
; /* How many users with user space? */
312 atomic_t mm_count
; /* How many references to "struct mm_struct" (users count as 1) */
313 int map_count
; /* number of VMAs */
314 struct rw_semaphore mmap_sem
;
315 spinlock_t page_table_lock
; /* Protects page tables and some counters */
317 struct list_head mmlist
; /* List of maybe swapped mm's. These are globally strung
318 * together off init_mm.mmlist, and are protected
322 /* Special counters, in some configurations protected by the
323 * page_table_lock, in other configurations by being atomic.
325 mm_counter_t _file_rss
;
326 mm_counter_t _anon_rss
;
328 unsigned long hiwater_rss
; /* High-watermark of RSS usage */
329 unsigned long hiwater_vm
; /* High-water virtual memory usage */
331 unsigned long total_vm
, locked_vm
, shared_vm
, exec_vm
;
332 unsigned long stack_vm
, reserved_vm
, def_flags
, nr_ptes
;
333 unsigned long start_code
, end_code
, start_data
, end_data
;
334 unsigned long start_brk
, brk
, start_stack
;
335 unsigned long arg_start
, arg_end
, env_start
, env_end
;
337 unsigned long saved_auxv
[AT_VECTOR_SIZE
]; /* for /proc/PID/auxv */
340 cpumask_t cpu_vm_mask
;
342 /* Architecture-specific MM context */
343 mm_context_t context
;
345 /* Token based thrashing protection. */
346 unsigned long swap_token_time
;
349 /* coredumping support */
351 struct completion
*core_startup_done
, core_done
;
354 rwlock_t ioctx_list_lock
;
355 struct kioctx
*ioctx_list
;
358 struct sighand_struct
{
360 struct k_sigaction action
[_NSIG
];
364 struct pacct_struct
{
367 unsigned long ac_mem
;
368 cputime_t ac_utime
, ac_stime
;
369 unsigned long ac_minflt
, ac_majflt
;
373 * NOTE! "signal_struct" does not have it's own
374 * locking, because a shared signal_struct always
375 * implies a shared sighand_struct, so locking
376 * sighand_struct is always a proper superset of
377 * the locking of signal_struct.
379 struct signal_struct
{
383 wait_queue_head_t wait_chldexit
; /* for wait4() */
385 /* current thread group signal load-balancing target: */
386 struct task_struct
*curr_target
;
388 /* shared signal handling: */
389 struct sigpending shared_pending
;
391 /* thread group exit support */
394 * - notify group_exit_task when ->count is equal to notify_count
395 * - everyone except group_exit_task is stopped during signal delivery
396 * of fatal signals, group_exit_task processes the signal.
398 struct task_struct
*group_exit_task
;
401 /* thread group stop support, overloads group_exit_code too */
402 int group_stop_count
;
403 unsigned int flags
; /* see SIGNAL_* flags below */
405 /* POSIX.1b Interval Timers */
406 struct list_head posix_timers
;
408 /* ITIMER_REAL timer for the process */
409 struct hrtimer real_timer
;
410 struct task_struct
*tsk
;
411 ktime_t it_real_incr
;
413 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
414 cputime_t it_prof_expires
, it_virt_expires
;
415 cputime_t it_prof_incr
, it_virt_incr
;
417 /* job control IDs */
421 /* boolean value for session group leader */
424 struct tty_struct
*tty
; /* NULL if no tty */
427 * Cumulative resource counters for dead threads in the group,
428 * and for reaped dead child processes forked by this group.
429 * Live threads maintain their own counters and add to these
430 * in __exit_signal, except for the group leader.
432 cputime_t utime
, stime
, cutime
, cstime
;
433 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
434 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
437 * Cumulative ns of scheduled CPU time for dead threads in the
438 * group, not including a zombie group leader. (This only differs
439 * from jiffies_to_ns(utime + stime) if sched_clock uses something
440 * other than jiffies.)
442 unsigned long long sched_time
;
445 * We don't bother to synchronize most readers of this at all,
446 * because there is no reader checking a limit that actually needs
447 * to get both rlim_cur and rlim_max atomically, and either one
448 * alone is a single word that can safely be read normally.
449 * getrlimit/setrlimit use task_lock(current->group_leader) to
450 * protect this instead of the siglock, because they really
451 * have no need to disable irqs.
453 struct rlimit rlim
[RLIM_NLIMITS
];
455 struct list_head cpu_timers
[3];
457 /* keep the process-shared keyrings here so that they do the right
458 * thing in threads created with CLONE_THREAD */
460 struct key
*session_keyring
; /* keyring inherited over fork */
461 struct key
*process_keyring
; /* keyring private to this process */
463 #ifdef CONFIG_BSD_PROCESS_ACCT
464 struct pacct_struct pacct
; /* per-process accounting information */
466 #ifdef CONFIG_TASKSTATS
467 spinlock_t stats_lock
;
468 struct taskstats
*stats
;
472 /* Context switch must be unlocked if interrupts are to be enabled */
473 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
474 # define __ARCH_WANT_UNLOCKED_CTXSW
478 * Bits in flags field of signal_struct.
480 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
481 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
482 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
483 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
487 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
488 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
489 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
490 * values are inverted: lower p->prio value means higher priority.
492 * The MAX_USER_RT_PRIO value allows the actual maximum
493 * RT priority to be separate from the value exported to
494 * user-space. This allows kernel threads to set their
495 * priority to a value higher than any user task. Note:
496 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
499 #define MAX_USER_RT_PRIO 100
500 #define MAX_RT_PRIO MAX_USER_RT_PRIO
502 #define MAX_PRIO (MAX_RT_PRIO + 40)
504 #define rt_prio(prio) unlikely((prio) < MAX_RT_PRIO)
505 #define rt_task(p) rt_prio((p)->prio)
506 #define batch_task(p) (unlikely((p)->policy == SCHED_BATCH))
507 #define has_rt_policy(p) \
508 unlikely((p)->policy != SCHED_NORMAL && (p)->policy != SCHED_BATCH)
511 * Some day this will be a full-fledged user tracking system..
514 atomic_t __count
; /* reference count */
515 atomic_t processes
; /* How many processes does this user have? */
516 atomic_t files
; /* How many open files does this user have? */
517 atomic_t sigpending
; /* How many pending signals does this user have? */
518 #ifdef CONFIG_INOTIFY_USER
519 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
520 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
522 /* protected by mq_lock */
523 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
524 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
527 struct key
*uid_keyring
; /* UID specific keyring */
528 struct key
*session_keyring
; /* UID's default session keyring */
531 /* Hash table maintenance information */
532 struct list_head uidhash_list
;
536 extern struct user_struct
*find_user(uid_t
);
538 extern struct user_struct root_user
;
539 #define INIT_USER (&root_user)
541 struct backing_dev_info
;
542 struct reclaim_state
;
544 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
546 /* cumulative counters */
547 unsigned long cpu_time
, /* time spent on the cpu */
548 run_delay
, /* time spent waiting on a runqueue */
549 pcnt
; /* # of timeslices run on this cpu */
552 unsigned long last_arrival
, /* when we last ran on a cpu */
553 last_queued
; /* when we were last queued to run */
555 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
557 #ifdef CONFIG_SCHEDSTATS
558 extern struct file_operations proc_schedstat_operations
;
559 #endif /* CONFIG_SCHEDSTATS */
561 #ifdef CONFIG_TASK_DELAY_ACCT
562 struct task_delay_info
{
564 unsigned int flags
; /* Private per-task flags */
566 /* For each stat XXX, add following, aligned appropriately
568 * struct timespec XXX_start, XXX_end;
572 * Atomicity of updates to XXX_delay, XXX_count protected by
573 * single lock above (split into XXX_lock if contention is an issue).
577 * XXX_count is incremented on every XXX operation, the delay
578 * associated with the operation is added to XXX_delay.
579 * XXX_delay contains the accumulated delay time in nanoseconds.
581 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
582 u64 blkio_delay
; /* wait for sync block io completion */
583 u64 swapin_delay
; /* wait for swapin block io completion */
584 u32 blkio_count
; /* total count of the number of sync block */
585 /* io operations performed */
586 u32 swapin_count
; /* total count of the number of swapin block */
587 /* io operations performed */
589 #endif /* CONFIG_TASK_DELAY_ACCT */
591 static inline int sched_info_on(void)
593 #ifdef CONFIG_SCHEDSTATS
595 #elif defined(CONFIG_TASK_DELAY_ACCT)
596 extern int delayacct_on
;
612 * sched-domains (multiprocessor balancing) declarations:
614 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
617 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
618 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
619 #define SD_BALANCE_EXEC 4 /* Balance on exec */
620 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
621 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
622 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
623 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
624 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
625 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
627 #define BALANCE_FOR_POWER ((sched_mc_power_savings || sched_smt_power_savings) \
628 ? SD_POWERSAVINGS_BALANCE : 0)
632 struct sched_group
*next
; /* Must be a circular list */
636 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
637 * single CPU. This is read only (except for setup, hotplug CPU).
639 unsigned long cpu_power
;
642 struct sched_domain
{
643 /* These fields must be setup */
644 struct sched_domain
*parent
; /* top domain must be null terminated */
645 struct sched_group
*groups
; /* the balancing groups of the domain */
646 cpumask_t span
; /* span of all CPUs in this domain */
647 unsigned long min_interval
; /* Minimum balance interval ms */
648 unsigned long max_interval
; /* Maximum balance interval ms */
649 unsigned int busy_factor
; /* less balancing by factor if busy */
650 unsigned int imbalance_pct
; /* No balance until over watermark */
651 unsigned long long cache_hot_time
; /* Task considered cache hot (ns) */
652 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
653 unsigned int per_cpu_gain
; /* CPU % gained by adding domain cpus */
654 unsigned int busy_idx
;
655 unsigned int idle_idx
;
656 unsigned int newidle_idx
;
657 unsigned int wake_idx
;
658 unsigned int forkexec_idx
;
659 int flags
; /* See SD_* */
661 /* Runtime fields. */
662 unsigned long last_balance
; /* init to jiffies. units in jiffies */
663 unsigned int balance_interval
; /* initialise to 1. units in ms. */
664 unsigned int nr_balance_failed
; /* initialise to 0 */
666 #ifdef CONFIG_SCHEDSTATS
667 /* load_balance() stats */
668 unsigned long lb_cnt
[MAX_IDLE_TYPES
];
669 unsigned long lb_failed
[MAX_IDLE_TYPES
];
670 unsigned long lb_balanced
[MAX_IDLE_TYPES
];
671 unsigned long lb_imbalance
[MAX_IDLE_TYPES
];
672 unsigned long lb_gained
[MAX_IDLE_TYPES
];
673 unsigned long lb_hot_gained
[MAX_IDLE_TYPES
];
674 unsigned long lb_nobusyg
[MAX_IDLE_TYPES
];
675 unsigned long lb_nobusyq
[MAX_IDLE_TYPES
];
677 /* Active load balancing */
678 unsigned long alb_cnt
;
679 unsigned long alb_failed
;
680 unsigned long alb_pushed
;
682 /* SD_BALANCE_EXEC stats */
683 unsigned long sbe_cnt
;
684 unsigned long sbe_balanced
;
685 unsigned long sbe_pushed
;
687 /* SD_BALANCE_FORK stats */
688 unsigned long sbf_cnt
;
689 unsigned long sbf_balanced
;
690 unsigned long sbf_pushed
;
692 /* try_to_wake_up() stats */
693 unsigned long ttwu_wake_remote
;
694 unsigned long ttwu_move_affine
;
695 unsigned long ttwu_move_balance
;
699 extern int partition_sched_domains(cpumask_t
*partition1
,
700 cpumask_t
*partition2
);
703 * Maximum cache size the migration-costs auto-tuning code will
706 extern unsigned int max_cache_size
;
708 #endif /* CONFIG_SMP */
711 struct io_context
; /* See blkdev.h */
712 void exit_io_context(void);
715 #define NGROUPS_SMALL 32
716 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
720 gid_t small_block
[NGROUPS_SMALL
];
726 * get_group_info() must be called with the owning task locked (via task_lock())
727 * when task != current. The reason being that the vast majority of callers are
728 * looking at current->group_info, which can not be changed except by the
729 * current task. Changing current->group_info requires the task lock, too.
731 #define get_group_info(group_info) do { \
732 atomic_inc(&(group_info)->usage); \
735 #define put_group_info(group_info) do { \
736 if (atomic_dec_and_test(&(group_info)->usage)) \
737 groups_free(group_info); \
740 extern struct group_info
*groups_alloc(int gidsetsize
);
741 extern void groups_free(struct group_info
*group_info
);
742 extern int set_current_groups(struct group_info
*group_info
);
743 extern int groups_search(struct group_info
*group_info
, gid_t grp
);
744 /* access the groups "array" with this macro */
745 #define GROUP_AT(gi, i) \
746 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
748 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
749 extern void prefetch_stack(struct task_struct
*t
);
751 static inline void prefetch_stack(struct task_struct
*t
) { }
754 struct audit_context
; /* See audit.c */
756 struct pipe_inode_info
;
760 SLEEP_NONINTERACTIVE
,
768 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
769 struct thread_info
*thread_info
;
771 unsigned long flags
; /* per process flags, defined below */
772 unsigned long ptrace
;
774 int lock_depth
; /* BKL lock depth */
777 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
781 int load_weight
; /* for niceness load balancing purposes */
782 int prio
, static_prio
, normal_prio
;
783 struct list_head run_list
;
784 struct prio_array
*array
;
786 unsigned short ioprio
;
787 unsigned int btrace_seq
;
789 unsigned long sleep_avg
;
790 unsigned long long timestamp
, last_ran
;
791 unsigned long long sched_time
; /* sched_clock time spent running */
792 enum sleep_type sleep_type
;
794 unsigned long policy
;
795 cpumask_t cpus_allowed
;
796 unsigned int time_slice
, first_time_slice
;
798 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
799 struct sched_info sched_info
;
802 struct list_head tasks
;
804 * ptrace_list/ptrace_children forms the list of my children
805 * that were stolen by a ptracer.
807 struct list_head ptrace_children
;
808 struct list_head ptrace_list
;
810 struct mm_struct
*mm
, *active_mm
;
813 struct linux_binfmt
*binfmt
;
815 int exit_code
, exit_signal
;
816 int pdeath_signal
; /* The signal sent when the parent dies */
818 unsigned long personality
;
823 #ifdef CONFIG_CC_STACKPROTECTOR
824 /* Canary value for the -fstack-protector gcc feature */
825 unsigned long stack_canary
;
828 * pointers to (original) parent process, youngest child, younger sibling,
829 * older sibling, respectively. (p->father can be replaced with
832 struct task_struct
*real_parent
; /* real parent process (when being debugged) */
833 struct task_struct
*parent
; /* parent process */
835 * children/sibling forms the list of my children plus the
836 * tasks I'm ptracing.
838 struct list_head children
; /* list of my children */
839 struct list_head sibling
; /* linkage in my parent's children list */
840 struct task_struct
*group_leader
; /* threadgroup leader */
842 /* PID/PID hash table linkage. */
843 struct pid_link pids
[PIDTYPE_MAX
];
844 struct list_head thread_group
;
846 struct completion
*vfork_done
; /* for vfork() */
847 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
848 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
850 unsigned long rt_priority
;
851 cputime_t utime
, stime
;
852 unsigned long nvcsw
, nivcsw
; /* context switch counts */
853 struct timespec start_time
;
854 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
855 unsigned long min_flt
, maj_flt
;
857 cputime_t it_prof_expires
, it_virt_expires
;
858 unsigned long long it_sched_expires
;
859 struct list_head cpu_timers
[3];
861 /* process credentials */
862 uid_t uid
,euid
,suid
,fsuid
;
863 gid_t gid
,egid
,sgid
,fsgid
;
864 struct group_info
*group_info
;
865 kernel_cap_t cap_effective
, cap_inheritable
, cap_permitted
;
866 unsigned keep_capabilities
:1;
867 struct user_struct
*user
;
869 struct key
*request_key_auth
; /* assumed request_key authority */
870 struct key
*thread_keyring
; /* keyring private to this thread */
871 unsigned char jit_keyring
; /* default keyring to attach requested keys to */
874 * fpu_counter contains the number of consecutive context switches
875 * that the FPU is used. If this is over a threshold, the lazy fpu
876 * saving becomes unlazy to save the trap. This is an unsigned char
877 * so that after 256 times the counter wraps and the behavior turns
878 * lazy again; this to deal with bursty apps that only use FPU for
881 unsigned char fpu_counter
;
882 int oomkilladj
; /* OOM kill score adjustment (bit shift). */
883 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
884 - access with [gs]et_task_comm (which lock
886 - initialized normally by flush_old_exec */
887 /* file system info */
888 int link_count
, total_link_count
;
889 #ifdef CONFIG_SYSVIPC
891 struct sysv_sem sysvsem
;
893 /* CPU-specific state of this task */
894 struct thread_struct thread
;
895 /* filesystem information */
896 struct fs_struct
*fs
;
897 /* open file information */
898 struct files_struct
*files
;
900 struct namespace *namespace;
901 /* signal handlers */
902 struct signal_struct
*signal
;
903 struct sighand_struct
*sighand
;
905 sigset_t blocked
, real_blocked
;
906 sigset_t saved_sigmask
; /* To be restored with TIF_RESTORE_SIGMASK */
907 struct sigpending pending
;
909 unsigned long sas_ss_sp
;
911 int (*notifier
)(void *priv
);
913 sigset_t
*notifier_mask
;
916 struct audit_context
*audit_context
;
919 /* Thread group tracking */
922 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
923 spinlock_t alloc_lock
;
925 /* Protection of the PI data structures: */
928 #ifdef CONFIG_RT_MUTEXES
929 /* PI waiters blocked on a rt_mutex held by this task */
930 struct plist_head pi_waiters
;
931 /* Deadlock detection and priority inheritance handling */
932 struct rt_mutex_waiter
*pi_blocked_on
;
935 #ifdef CONFIG_DEBUG_MUTEXES
936 /* mutex deadlock detection */
937 struct mutex_waiter
*blocked_on
;
939 #ifdef CONFIG_TRACE_IRQFLAGS
940 unsigned int irq_events
;
941 int hardirqs_enabled
;
942 unsigned long hardirq_enable_ip
;
943 unsigned int hardirq_enable_event
;
944 unsigned long hardirq_disable_ip
;
945 unsigned int hardirq_disable_event
;
946 int softirqs_enabled
;
947 unsigned long softirq_disable_ip
;
948 unsigned int softirq_disable_event
;
949 unsigned long softirq_enable_ip
;
950 unsigned int softirq_enable_event
;
954 #ifdef CONFIG_LOCKDEP
955 # define MAX_LOCK_DEPTH 30UL
958 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
959 unsigned int lockdep_recursion
;
962 /* journalling filesystem info */
966 struct reclaim_state
*reclaim_state
;
968 struct backing_dev_info
*backing_dev_info
;
970 struct io_context
*io_context
;
972 unsigned long ptrace_message
;
973 siginfo_t
*last_siginfo
; /* For ptrace use. */
975 * current io wait handle: wait queue entry to use for io waits
976 * If this thread is processing aio, this points at the waitqueue
977 * inside the currently handled kiocb. It may be NULL (i.e. default
978 * to a stack based synchronous wait) if its doing sync IO.
980 wait_queue_t
*io_wait
;
981 /* i/o counters(bytes read/written, #syscalls */
982 u64 rchar
, wchar
, syscr
, syscw
;
983 #if defined(CONFIG_BSD_PROCESS_ACCT)
984 u64 acct_rss_mem1
; /* accumulated rss usage */
985 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
986 clock_t acct_stimexpd
; /* clock_t-converted stime since last update */
989 struct mempolicy
*mempolicy
;
992 #ifdef CONFIG_CPUSETS
993 struct cpuset
*cpuset
;
994 nodemask_t mems_allowed
;
995 int cpuset_mems_generation
;
996 int cpuset_mem_spread_rotor
;
998 struct robust_list_head __user
*robust_list
;
1000 struct compat_robust_list_head __user
*compat_robust_list
;
1002 struct list_head pi_state_list
;
1003 struct futex_pi_state
*pi_state_cache
;
1005 atomic_t fs_excl
; /* holding fs exclusive resources */
1006 struct rcu_head rcu
;
1009 * cache last used pipe for splice
1011 struct pipe_inode_info
*splice_pipe
;
1012 #ifdef CONFIG_TASK_DELAY_ACCT
1013 struct task_delay_info
*delays
;
1017 static inline pid_t
process_group(struct task_struct
*tsk
)
1019 return tsk
->signal
->pgrp
;
1023 * pid_alive - check that a task structure is not stale
1024 * @p: Task structure to be checked.
1026 * Test if a process is not yet dead (at most zombie state)
1027 * If pid_alive fails, then pointers within the task structure
1028 * can be stale and must not be dereferenced.
1030 static inline int pid_alive(struct task_struct
*p
)
1032 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1035 extern void free_task(struct task_struct
*tsk
);
1036 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1038 extern void __put_task_struct(struct task_struct
*t
);
1040 static inline void put_task_struct(struct task_struct
*t
)
1042 if (atomic_dec_and_test(&t
->usage
))
1043 __put_task_struct(t
);
1049 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1050 /* Not implemented yet, only for 486*/
1051 #define PF_STARTING 0x00000002 /* being created */
1052 #define PF_EXITING 0x00000004 /* getting shut down */
1053 #define PF_DEAD 0x00000008 /* Dead */
1054 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1055 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1056 #define PF_DUMPCORE 0x00000200 /* dumped core */
1057 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1058 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1059 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1060 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1061 #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
1062 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1063 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1064 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1065 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1066 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1067 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1068 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1069 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1070 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1071 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1072 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1073 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1074 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1077 * Only the _current_ task can read/write to tsk->flags, but other
1078 * tasks can access tsk->flags in readonly mode for example
1079 * with tsk_used_math (like during threaded core dumping).
1080 * There is however an exception to this rule during ptrace
1081 * or during fork: the ptracer task is allowed to write to the
1082 * child->flags of its traced child (same goes for fork, the parent
1083 * can write to the child->flags), because we're guaranteed the
1084 * child is not running and in turn not changing child->flags
1085 * at the same time the parent does it.
1087 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1088 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1089 #define clear_used_math() clear_stopped_child_used_math(current)
1090 #define set_used_math() set_stopped_child_used_math(current)
1091 #define conditional_stopped_child_used_math(condition, child) \
1092 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1093 #define conditional_used_math(condition) \
1094 conditional_stopped_child_used_math(condition, current)
1095 #define copy_to_stopped_child_used_math(child) \
1096 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1097 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1098 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1099 #define used_math() tsk_used_math(current)
1102 extern int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
);
1104 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1106 if (!cpu_isset(0, new_mask
))
1112 extern unsigned long long sched_clock(void);
1113 extern unsigned long long
1114 current_sched_time(const struct task_struct
*current_task
);
1116 /* sched_exec is called by processes performing an exec */
1118 extern void sched_exec(void);
1120 #define sched_exec() {}
1123 #ifdef CONFIG_HOTPLUG_CPU
1124 extern void idle_task_exit(void);
1126 static inline void idle_task_exit(void) {}
1129 extern void sched_idle_next(void);
1131 #ifdef CONFIG_RT_MUTEXES
1132 extern int rt_mutex_getprio(struct task_struct
*p
);
1133 extern void rt_mutex_setprio(struct task_struct
*p
, int prio
);
1134 extern void rt_mutex_adjust_pi(struct task_struct
*p
);
1136 static inline int rt_mutex_getprio(struct task_struct
*p
)
1138 return p
->normal_prio
;
1140 # define rt_mutex_adjust_pi(p) do { } while (0)
1143 extern void set_user_nice(struct task_struct
*p
, long nice
);
1144 extern int task_prio(const struct task_struct
*p
);
1145 extern int task_nice(const struct task_struct
*p
);
1146 extern int can_nice(const struct task_struct
*p
, const int nice
);
1147 extern int task_curr(const struct task_struct
*p
);
1148 extern int idle_cpu(int cpu
);
1149 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
1150 extern struct task_struct
*idle_task(int cpu
);
1151 extern struct task_struct
*curr_task(int cpu
);
1152 extern void set_curr_task(int cpu
, struct task_struct
*p
);
1157 * The default (Linux) execution domain.
1159 extern struct exec_domain default_exec_domain
;
1161 union thread_union
{
1162 struct thread_info thread_info
;
1163 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1166 #ifndef __HAVE_ARCH_KSTACK_END
1167 static inline int kstack_end(void *addr
)
1169 /* Reliable end of stack detection:
1170 * Some APM bios versions misalign the stack
1172 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1176 extern union thread_union init_thread_union
;
1177 extern struct task_struct init_task
;
1179 extern struct mm_struct init_mm
;
1181 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1182 extern struct task_struct
*find_task_by_pid_type(int type
, int pid
);
1183 extern void set_special_pids(pid_t session
, pid_t pgrp
);
1184 extern void __set_special_pids(pid_t session
, pid_t pgrp
);
1186 /* per-UID process charging. */
1187 extern struct user_struct
* alloc_uid(uid_t
);
1188 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1190 atomic_inc(&u
->__count
);
1193 extern void free_uid(struct user_struct
*);
1194 extern void switch_uid(struct user_struct
*);
1196 #include <asm/current.h>
1198 extern void do_timer(struct pt_regs
*);
1200 extern int FASTCALL(wake_up_state(struct task_struct
* tsk
, unsigned int state
));
1201 extern int FASTCALL(wake_up_process(struct task_struct
* tsk
));
1202 extern void FASTCALL(wake_up_new_task(struct task_struct
* tsk
,
1203 unsigned long clone_flags
));
1205 extern void kick_process(struct task_struct
*tsk
);
1207 static inline void kick_process(struct task_struct
*tsk
) { }
1209 extern void FASTCALL(sched_fork(struct task_struct
* p
, int clone_flags
));
1210 extern void FASTCALL(sched_exit(struct task_struct
* p
));
1212 extern int in_group_p(gid_t
);
1213 extern int in_egroup_p(gid_t
);
1215 extern void proc_caches_init(void);
1216 extern void flush_signals(struct task_struct
*);
1217 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
1218 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
1220 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
1222 unsigned long flags
;
1225 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
1226 ret
= dequeue_signal(tsk
, mask
, info
);
1227 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
1232 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
1234 extern void unblock_all_signals(void);
1235 extern void release_task(struct task_struct
* p
);
1236 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
1237 extern int send_group_sig_info(int, struct siginfo
*, struct task_struct
*);
1238 extern int force_sigsegv(int, struct task_struct
*);
1239 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
1240 extern int __kill_pg_info(int sig
, struct siginfo
*info
, pid_t pgrp
);
1241 extern int kill_pg_info(int, struct siginfo
*, pid_t
);
1242 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
1243 extern int kill_proc_info_as_uid(int, struct siginfo
*, pid_t
, uid_t
, uid_t
, u32
);
1244 extern void do_notify_parent(struct task_struct
*, int);
1245 extern void force_sig(int, struct task_struct
*);
1246 extern void force_sig_specific(int, struct task_struct
*);
1247 extern int send_sig(int, struct task_struct
*, int);
1248 extern void zap_other_threads(struct task_struct
*p
);
1249 extern int kill_pg(pid_t
, int, int);
1250 extern int kill_proc(pid_t
, int, int);
1251 extern struct sigqueue
*sigqueue_alloc(void);
1252 extern void sigqueue_free(struct sigqueue
*);
1253 extern int send_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1254 extern int send_group_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1255 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
1256 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
1258 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1259 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1260 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1261 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1263 static inline int is_si_special(const struct siginfo
*info
)
1265 return info
<= SEND_SIG_FORCED
;
1268 /* True if we are on the alternate signal stack. */
1270 static inline int on_sig_stack(unsigned long sp
)
1272 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
1275 static inline int sas_ss_flags(unsigned long sp
)
1277 return (current
->sas_ss_size
== 0 ? SS_DISABLE
1278 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
1282 * Routines for handling mm_structs
1284 extern struct mm_struct
* mm_alloc(void);
1286 /* mmdrop drops the mm and the page tables */
1287 extern void FASTCALL(__mmdrop(struct mm_struct
*));
1288 static inline void mmdrop(struct mm_struct
* mm
)
1290 if (atomic_dec_and_test(&mm
->mm_count
))
1294 /* mmput gets rid of the mappings and all user-space */
1295 extern void mmput(struct mm_struct
*);
1296 /* Grab a reference to a task's mm, if it is not already going away */
1297 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
1298 /* Remove the current tasks stale references to the old mm_struct */
1299 extern void mm_release(struct task_struct
*, struct mm_struct
*);
1301 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct
*, struct pt_regs
*);
1302 extern void flush_thread(void);
1303 extern void exit_thread(void);
1305 extern void exit_files(struct task_struct
*);
1306 extern void __cleanup_signal(struct signal_struct
*);
1307 extern void __cleanup_sighand(struct sighand_struct
*);
1308 extern void exit_itimers(struct signal_struct
*);
1310 extern NORET_TYPE
void do_group_exit(int);
1312 extern void daemonize(const char *, ...);
1313 extern int allow_signal(int);
1314 extern int disallow_signal(int);
1315 extern struct task_struct
*child_reaper
;
1317 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
1318 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
1319 struct task_struct
*fork_idle(int);
1321 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
1322 extern void get_task_comm(char *to
, struct task_struct
*tsk
);
1325 extern void wait_task_inactive(struct task_struct
* p
);
1327 #define wait_task_inactive(p) do { } while (0)
1330 #define remove_parent(p) list_del_init(&(p)->sibling)
1331 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1333 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1335 #define for_each_process(p) \
1336 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1339 * Careful: do_each_thread/while_each_thread is a double loop so
1340 * 'break' will not work as expected - use goto instead.
1342 #define do_each_thread(g, t) \
1343 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1345 #define while_each_thread(g, t) \
1346 while ((t = next_thread(t)) != g)
1348 /* de_thread depends on thread_group_leader not being a pid based check */
1349 #define thread_group_leader(p) (p == p->group_leader)
1351 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
1353 return list_entry(rcu_dereference(p
->thread_group
.next
),
1354 struct task_struct
, thread_group
);
1357 static inline int thread_group_empty(struct task_struct
*p
)
1359 return list_empty(&p
->thread_group
);
1362 #define delay_group_leader(p) \
1363 (thread_group_leader(p) && !thread_group_empty(p))
1366 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1367 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1368 * pins the final release of task.io_context. Also protects ->cpuset.
1370 * Nests both inside and outside of read_lock(&tasklist_lock).
1371 * It must not be nested with write_lock_irq(&tasklist_lock),
1372 * neither inside nor outside.
1374 static inline void task_lock(struct task_struct
*p
)
1376 spin_lock(&p
->alloc_lock
);
1379 static inline void task_unlock(struct task_struct
*p
)
1381 spin_unlock(&p
->alloc_lock
);
1384 extern struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
1385 unsigned long *flags
);
1387 static inline void unlock_task_sighand(struct task_struct
*tsk
,
1388 unsigned long *flags
)
1390 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
1393 #ifndef __HAVE_THREAD_FUNCTIONS
1395 #define task_thread_info(task) (task)->thread_info
1396 #define task_stack_page(task) ((void*)((task)->thread_info))
1398 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
1400 *task_thread_info(p
) = *task_thread_info(org
);
1401 task_thread_info(p
)->task
= p
;
1404 static inline unsigned long *end_of_stack(struct task_struct
*p
)
1406 return (unsigned long *)(p
->thread_info
+ 1);
1411 /* set thread flags in other task's structures
1412 * - see asm/thread_info.h for TIF_xxxx flags available
1414 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1416 set_ti_thread_flag(task_thread_info(tsk
), flag
);
1419 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1421 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1424 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1426 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
1429 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1431 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1434 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1436 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
1439 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
1441 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1444 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
1446 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1449 static inline int signal_pending(struct task_struct
*p
)
1451 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
1454 static inline int need_resched(void)
1456 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
1460 * cond_resched() and cond_resched_lock(): latency reduction via
1461 * explicit rescheduling in places that are safe. The return
1462 * value indicates whether a reschedule was done in fact.
1463 * cond_resched_lock() will drop the spinlock before scheduling,
1464 * cond_resched_softirq() will enable bhs before scheduling.
1466 extern int cond_resched(void);
1467 extern int cond_resched_lock(spinlock_t
* lock
);
1468 extern int cond_resched_softirq(void);
1471 * Does a critical section need to be broken due to another
1474 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1475 # define need_lockbreak(lock) ((lock)->break_lock)
1477 # define need_lockbreak(lock) 0
1481 * Does a critical section need to be broken due to another
1482 * task waiting or preemption being signalled:
1484 static inline int lock_need_resched(spinlock_t
*lock
)
1486 if (need_lockbreak(lock
) || need_resched())
1491 /* Reevaluate whether the task has signals pending delivery.
1492 This is required every time the blocked sigset_t changes.
1493 callers must hold sighand->siglock. */
1495 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct
*t
));
1496 extern void recalc_sigpending(void);
1498 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
1501 * Wrappers for p->thread_info->cpu access. No-op on UP.
1505 static inline unsigned int task_cpu(const struct task_struct
*p
)
1507 return task_thread_info(p
)->cpu
;
1510 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1512 task_thread_info(p
)->cpu
= cpu
;
1517 static inline unsigned int task_cpu(const struct task_struct
*p
)
1522 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1526 #endif /* CONFIG_SMP */
1528 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1529 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
1531 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
)
1533 mm
->mmap_base
= TASK_UNMAPPED_BASE
;
1534 mm
->get_unmapped_area
= arch_get_unmapped_area
;
1535 mm
->unmap_area
= arch_unmap_area
;
1539 extern long sched_setaffinity(pid_t pid
, cpumask_t new_mask
);
1540 extern long sched_getaffinity(pid_t pid
, cpumask_t
*mask
);
1542 #include <linux/sysdev.h>
1543 extern int sched_mc_power_savings
, sched_smt_power_savings
;
1544 extern struct sysdev_attribute attr_sched_mc_power_savings
, attr_sched_smt_power_savings
;
1545 extern int sched_create_sysfs_power_savings_entries(struct sysdev_class
*cls
);
1547 extern void normalize_rt_tasks(void);
1551 * Check if a process has been frozen
1553 static inline int frozen(struct task_struct
*p
)
1555 return p
->flags
& PF_FROZEN
;
1559 * Check if there is a request to freeze a process
1561 static inline int freezing(struct task_struct
*p
)
1563 return p
->flags
& PF_FREEZE
;
1567 * Request that a process be frozen
1568 * FIXME: SMP problem. We may not modify other process' flags!
1570 static inline void freeze(struct task_struct
*p
)
1572 p
->flags
|= PF_FREEZE
;
1576 * Sometimes we may need to cancel the previous 'freeze' request
1578 static inline void do_not_freeze(struct task_struct
*p
)
1580 p
->flags
&= ~PF_FREEZE
;
1584 * Wake up a frozen process
1586 static inline int thaw_process(struct task_struct
*p
)
1589 p
->flags
&= ~PF_FROZEN
;
1597 * freezing is complete, mark process as frozen
1599 static inline void frozen_process(struct task_struct
*p
)
1601 p
->flags
= (p
->flags
& ~PF_FREEZE
) | PF_FROZEN
;
1604 extern void refrigerator(void);
1605 extern int freeze_processes(void);
1606 extern void thaw_processes(void);
1608 static inline int try_to_freeze(void)
1610 if (freezing(current
)) {
1617 static inline int frozen(struct task_struct
*p
) { return 0; }
1618 static inline int freezing(struct task_struct
*p
) { return 0; }
1619 static inline void freeze(struct task_struct
*p
) { BUG(); }
1620 static inline int thaw_process(struct task_struct
*p
) { return 1; }
1621 static inline void frozen_process(struct task_struct
*p
) { BUG(); }
1623 static inline void refrigerator(void) {}
1624 static inline int freeze_processes(void) { BUG(); return 0; }
1625 static inline void thaw_processes(void) {}
1627 static inline int try_to_freeze(void) { return 0; }
1629 #endif /* CONFIG_PM */
1630 #endif /* __KERNEL__ */