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>
86 #include <asm/processor.h>
89 struct futex_pi_state
;
92 * List of flags we want to share for kernel threads,
93 * if only because they are not used by them anyway.
95 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
98 * These are the constant used to fake the fixed-point load-average
99 * counting. Some notes:
100 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
101 * a load-average precision of 10 bits integer + 11 bits fractional
102 * - if you want to count load-averages more often, you need more
103 * precision, or rounding will get you. With 2-second counting freq,
104 * the EXP_n values would be 1981, 2034 and 2043 if still using only
107 extern unsigned long avenrun
[]; /* Load averages */
109 #define FSHIFT 11 /* nr of bits of precision */
110 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
111 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
112 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
113 #define EXP_5 2014 /* 1/exp(5sec/5min) */
114 #define EXP_15 2037 /* 1/exp(5sec/15min) */
116 #define CALC_LOAD(load,exp,n) \
118 load += n*(FIXED_1-exp); \
121 extern unsigned long total_forks
;
122 extern int nr_threads
;
123 DECLARE_PER_CPU(unsigned long, process_counts
);
124 extern int nr_processes(void);
125 extern unsigned long nr_running(void);
126 extern unsigned long nr_uninterruptible(void);
127 extern unsigned long nr_active(void);
128 extern unsigned long nr_iowait(void);
129 extern unsigned long weighted_cpuload(const int cpu
);
133 * Task state bitmask. NOTE! These bits are also
134 * encoded in fs/proc/array.c: get_task_state().
136 * We have two separate sets of flags: task->state
137 * is about runnability, while task->exit_state are
138 * about the task exiting. Confusing, but this way
139 * modifying one set can't modify the other one by
142 #define TASK_RUNNING 0
143 #define TASK_INTERRUPTIBLE 1
144 #define TASK_UNINTERRUPTIBLE 2
145 #define TASK_STOPPED 4
146 #define TASK_TRACED 8
147 /* in tsk->exit_state */
148 #define EXIT_ZOMBIE 16
150 /* in tsk->state again */
151 #define TASK_NONINTERACTIVE 64
152 #define TASK_DEAD 128
154 #define __set_task_state(tsk, state_value) \
155 do { (tsk)->state = (state_value); } while (0)
156 #define set_task_state(tsk, state_value) \
157 set_mb((tsk)->state, (state_value))
160 * set_current_state() includes a barrier so that the write of current->state
161 * is correctly serialised wrt the caller's subsequent test of whether to
164 * set_current_state(TASK_UNINTERRUPTIBLE);
165 * if (do_i_need_to_sleep())
168 * If the caller does not need such serialisation then use __set_current_state()
170 #define __set_current_state(state_value) \
171 do { current->state = (state_value); } while (0)
172 #define set_current_state(state_value) \
173 set_mb(current->state, (state_value))
175 /* Task command name length */
176 #define TASK_COMM_LEN 16
178 #include <linux/spinlock.h>
181 * This serializes "schedule()" and also protects
182 * the run-queue from deletions/modifications (but
183 * _adding_ to the beginning of the run-queue has
186 extern rwlock_t tasklist_lock
;
187 extern spinlock_t mmlist_lock
;
191 extern void sched_init(void);
192 extern void sched_init_smp(void);
193 extern void init_idle(struct task_struct
*idle
, int cpu
);
195 extern cpumask_t nohz_cpu_mask
;
198 * Only dump TASK_* tasks. (-1 for all tasks)
200 extern void show_state_filter(unsigned long state_filter
);
202 static inline void show_state(void)
204 show_state_filter(-1);
207 extern void show_regs(struct pt_regs
*);
210 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
211 * task), SP is the stack pointer of the first frame that should be shown in the back
212 * trace (or NULL if the entire call-chain of the task should be shown).
214 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
216 void io_schedule(void);
217 long io_schedule_timeout(long timeout
);
219 extern void cpu_init (void);
220 extern void trap_init(void);
221 extern void update_process_times(int user
);
222 extern void scheduler_tick(void);
224 #ifdef CONFIG_DETECT_SOFTLOCKUP
225 extern void softlockup_tick(void);
226 extern void spawn_softlockup_task(void);
227 extern void touch_softlockup_watchdog(void);
229 static inline void softlockup_tick(void)
232 static inline void spawn_softlockup_task(void)
235 static inline void touch_softlockup_watchdog(void)
241 /* Attach to any functions which should be ignored in wchan output. */
242 #define __sched __attribute__((__section__(".sched.text")))
243 /* Is this address in the __sched functions? */
244 extern int in_sched_functions(unsigned long addr
);
246 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
247 extern signed long FASTCALL(schedule_timeout(signed long timeout
));
248 extern signed long schedule_timeout_interruptible(signed long timeout
);
249 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
250 asmlinkage
void schedule(void);
254 /* Maximum number of active map areas.. This is a random (large) number */
255 #define DEFAULT_MAX_MAP_COUNT 65536
257 extern int sysctl_max_map_count
;
259 #include <linux/aio.h>
262 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
263 unsigned long, unsigned long);
265 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
266 unsigned long len
, unsigned long pgoff
,
267 unsigned long flags
);
268 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
269 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
271 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
273 * The mm counters are not protected by its page_table_lock,
274 * so must be incremented atomically.
276 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
277 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
278 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
279 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
280 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
281 typedef atomic_long_t mm_counter_t
;
283 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
285 * The mm counters are protected by its page_table_lock,
286 * so can be incremented directly.
288 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
289 #define get_mm_counter(mm, member) ((mm)->_##member)
290 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
291 #define inc_mm_counter(mm, member) (mm)->_##member++
292 #define dec_mm_counter(mm, member) (mm)->_##member--
293 typedef unsigned long mm_counter_t
;
295 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
297 #define get_mm_rss(mm) \
298 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
299 #define update_hiwater_rss(mm) do { \
300 unsigned long _rss = get_mm_rss(mm); \
301 if ((mm)->hiwater_rss < _rss) \
302 (mm)->hiwater_rss = _rss; \
304 #define update_hiwater_vm(mm) do { \
305 if ((mm)->hiwater_vm < (mm)->total_vm) \
306 (mm)->hiwater_vm = (mm)->total_vm; \
310 struct vm_area_struct
* mmap
; /* list of VMAs */
311 struct rb_root mm_rb
;
312 struct vm_area_struct
* mmap_cache
; /* last find_vma result */
313 unsigned long (*get_unmapped_area
) (struct file
*filp
,
314 unsigned long addr
, unsigned long len
,
315 unsigned long pgoff
, unsigned long flags
);
316 void (*unmap_area
) (struct mm_struct
*mm
, unsigned long addr
);
317 unsigned long mmap_base
; /* base of mmap area */
318 unsigned long task_size
; /* size of task vm space */
319 unsigned long cached_hole_size
; /* if non-zero, the largest hole below free_area_cache */
320 unsigned long free_area_cache
; /* first hole of size cached_hole_size or larger */
322 atomic_t mm_users
; /* How many users with user space? */
323 atomic_t mm_count
; /* How many references to "struct mm_struct" (users count as 1) */
324 int map_count
; /* number of VMAs */
325 struct rw_semaphore mmap_sem
;
326 spinlock_t page_table_lock
; /* Protects page tables and some counters */
328 struct list_head mmlist
; /* List of maybe swapped mm's. These are globally strung
329 * together off init_mm.mmlist, and are protected
333 /* Special counters, in some configurations protected by the
334 * page_table_lock, in other configurations by being atomic.
336 mm_counter_t _file_rss
;
337 mm_counter_t _anon_rss
;
339 unsigned long hiwater_rss
; /* High-watermark of RSS usage */
340 unsigned long hiwater_vm
; /* High-water virtual memory usage */
342 unsigned long total_vm
, locked_vm
, shared_vm
, exec_vm
;
343 unsigned long stack_vm
, reserved_vm
, def_flags
, nr_ptes
;
344 unsigned long start_code
, end_code
, start_data
, end_data
;
345 unsigned long start_brk
, brk
, start_stack
;
346 unsigned long arg_start
, arg_end
, env_start
, env_end
;
348 unsigned long saved_auxv
[AT_VECTOR_SIZE
]; /* for /proc/PID/auxv */
350 cpumask_t cpu_vm_mask
;
352 /* Architecture-specific MM context */
353 mm_context_t context
;
355 /* Swap token stuff */
357 * Last value of global fault stamp as seen by this process.
358 * In other words, this value gives an indication of how long
359 * it has been since this task got the token.
360 * Look at mm/thrash.c
362 unsigned int faultstamp
;
363 unsigned int token_priority
;
364 unsigned int last_interval
;
366 unsigned char dumpable
:2;
368 /* coredumping support */
370 struct completion
*core_startup_done
, core_done
;
373 rwlock_t ioctx_list_lock
;
374 struct kioctx
*ioctx_list
;
377 struct sighand_struct
{
379 struct k_sigaction action
[_NSIG
];
383 struct pacct_struct
{
386 unsigned long ac_mem
;
387 cputime_t ac_utime
, ac_stime
;
388 unsigned long ac_minflt
, ac_majflt
;
392 * NOTE! "signal_struct" does not have it's own
393 * locking, because a shared signal_struct always
394 * implies a shared sighand_struct, so locking
395 * sighand_struct is always a proper superset of
396 * the locking of signal_struct.
398 struct signal_struct
{
402 wait_queue_head_t wait_chldexit
; /* for wait4() */
404 /* current thread group signal load-balancing target: */
405 struct task_struct
*curr_target
;
407 /* shared signal handling: */
408 struct sigpending shared_pending
;
410 /* thread group exit support */
413 * - notify group_exit_task when ->count is equal to notify_count
414 * - everyone except group_exit_task is stopped during signal delivery
415 * of fatal signals, group_exit_task processes the signal.
417 struct task_struct
*group_exit_task
;
420 /* thread group stop support, overloads group_exit_code too */
421 int group_stop_count
;
422 unsigned int flags
; /* see SIGNAL_* flags below */
424 /* POSIX.1b Interval Timers */
425 struct list_head posix_timers
;
427 /* ITIMER_REAL timer for the process */
428 struct hrtimer real_timer
;
429 struct task_struct
*tsk
;
430 ktime_t it_real_incr
;
432 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
433 cputime_t it_prof_expires
, it_virt_expires
;
434 cputime_t it_prof_incr
, it_virt_incr
;
436 /* job control IDs */
441 pid_t session __deprecated
;
445 /* boolean value for session group leader */
448 struct tty_struct
*tty
; /* NULL if no tty */
451 * Cumulative resource counters for dead threads in the group,
452 * and for reaped dead child processes forked by this group.
453 * Live threads maintain their own counters and add to these
454 * in __exit_signal, except for the group leader.
456 cputime_t utime
, stime
, cutime
, cstime
;
457 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
458 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
461 * Cumulative ns of scheduled CPU time for dead threads in the
462 * group, not including a zombie group leader. (This only differs
463 * from jiffies_to_ns(utime + stime) if sched_clock uses something
464 * other than jiffies.)
466 unsigned long long sched_time
;
469 * We don't bother to synchronize most readers of this at all,
470 * because there is no reader checking a limit that actually needs
471 * to get both rlim_cur and rlim_max atomically, and either one
472 * alone is a single word that can safely be read normally.
473 * getrlimit/setrlimit use task_lock(current->group_leader) to
474 * protect this instead of the siglock, because they really
475 * have no need to disable irqs.
477 struct rlimit rlim
[RLIM_NLIMITS
];
479 struct list_head cpu_timers
[3];
481 /* keep the process-shared keyrings here so that they do the right
482 * thing in threads created with CLONE_THREAD */
484 struct key
*session_keyring
; /* keyring inherited over fork */
485 struct key
*process_keyring
; /* keyring private to this process */
487 #ifdef CONFIG_BSD_PROCESS_ACCT
488 struct pacct_struct pacct
; /* per-process accounting information */
490 #ifdef CONFIG_TASKSTATS
491 struct taskstats
*stats
;
495 /* Context switch must be unlocked if interrupts are to be enabled */
496 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
497 # define __ARCH_WANT_UNLOCKED_CTXSW
501 * Bits in flags field of signal_struct.
503 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
504 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
505 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
506 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
510 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
511 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
512 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
513 * values are inverted: lower p->prio value means higher priority.
515 * The MAX_USER_RT_PRIO value allows the actual maximum
516 * RT priority to be separate from the value exported to
517 * user-space. This allows kernel threads to set their
518 * priority to a value higher than any user task. Note:
519 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
522 #define MAX_USER_RT_PRIO 100
523 #define MAX_RT_PRIO MAX_USER_RT_PRIO
525 #define MAX_PRIO (MAX_RT_PRIO + 40)
527 #define rt_prio(prio) unlikely((prio) < MAX_RT_PRIO)
528 #define rt_task(p) rt_prio((p)->prio)
529 #define batch_task(p) (unlikely((p)->policy == SCHED_BATCH))
530 #define is_rt_policy(p) ((p) != SCHED_NORMAL && (p) != SCHED_BATCH)
531 #define has_rt_policy(p) unlikely(is_rt_policy((p)->policy))
534 * Some day this will be a full-fledged user tracking system..
537 atomic_t __count
; /* reference count */
538 atomic_t processes
; /* How many processes does this user have? */
539 atomic_t files
; /* How many open files does this user have? */
540 atomic_t sigpending
; /* How many pending signals does this user have? */
541 #ifdef CONFIG_INOTIFY_USER
542 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
543 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
545 /* protected by mq_lock */
546 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
547 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
550 struct key
*uid_keyring
; /* UID specific keyring */
551 struct key
*session_keyring
; /* UID's default session keyring */
554 /* Hash table maintenance information */
555 struct list_head uidhash_list
;
559 extern struct user_struct
*find_user(uid_t
);
561 extern struct user_struct root_user
;
562 #define INIT_USER (&root_user)
564 struct backing_dev_info
;
565 struct reclaim_state
;
567 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
569 /* cumulative counters */
570 unsigned long cpu_time
, /* time spent on the cpu */
571 run_delay
, /* time spent waiting on a runqueue */
572 pcnt
; /* # of timeslices run on this cpu */
575 unsigned long last_arrival
, /* when we last ran on a cpu */
576 last_queued
; /* when we were last queued to run */
578 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
580 #ifdef CONFIG_SCHEDSTATS
581 extern const struct file_operations proc_schedstat_operations
;
582 #endif /* CONFIG_SCHEDSTATS */
584 #ifdef CONFIG_TASK_DELAY_ACCT
585 struct task_delay_info
{
587 unsigned int flags
; /* Private per-task flags */
589 /* For each stat XXX, add following, aligned appropriately
591 * struct timespec XXX_start, XXX_end;
595 * Atomicity of updates to XXX_delay, XXX_count protected by
596 * single lock above (split into XXX_lock if contention is an issue).
600 * XXX_count is incremented on every XXX operation, the delay
601 * associated with the operation is added to XXX_delay.
602 * XXX_delay contains the accumulated delay time in nanoseconds.
604 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
605 u64 blkio_delay
; /* wait for sync block io completion */
606 u64 swapin_delay
; /* wait for swapin block io completion */
607 u32 blkio_count
; /* total count of the number of sync block */
608 /* io operations performed */
609 u32 swapin_count
; /* total count of the number of swapin block */
610 /* io operations performed */
612 #endif /* CONFIG_TASK_DELAY_ACCT */
614 static inline int sched_info_on(void)
616 #ifdef CONFIG_SCHEDSTATS
618 #elif defined(CONFIG_TASK_DELAY_ACCT)
619 extern int delayacct_on
;
635 * sched-domains (multiprocessor balancing) declarations:
637 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
640 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
641 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
642 #define SD_BALANCE_EXEC 4 /* Balance on exec */
643 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
644 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
645 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
646 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
647 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
648 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
649 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
651 #define BALANCE_FOR_MC_POWER \
652 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
654 #define BALANCE_FOR_PKG_POWER \
655 ((sched_mc_power_savings || sched_smt_power_savings) ? \
656 SD_POWERSAVINGS_BALANCE : 0)
658 #define test_sd_parent(sd, flag) ((sd->parent && \
659 (sd->parent->flags & flag)) ? 1 : 0)
663 struct sched_group
*next
; /* Must be a circular list */
667 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
668 * single CPU. This is read only (except for setup, hotplug CPU).
670 unsigned long cpu_power
;
673 struct sched_domain
{
674 /* These fields must be setup */
675 struct sched_domain
*parent
; /* top domain must be null terminated */
676 struct sched_domain
*child
; /* bottom domain must be null terminated */
677 struct sched_group
*groups
; /* the balancing groups of the domain */
678 cpumask_t span
; /* span of all CPUs in this domain */
679 unsigned long min_interval
; /* Minimum balance interval ms */
680 unsigned long max_interval
; /* Maximum balance interval ms */
681 unsigned int busy_factor
; /* less balancing by factor if busy */
682 unsigned int imbalance_pct
; /* No balance until over watermark */
683 unsigned long long cache_hot_time
; /* Task considered cache hot (ns) */
684 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
685 unsigned int per_cpu_gain
; /* CPU % gained by adding domain cpus */
686 unsigned int busy_idx
;
687 unsigned int idle_idx
;
688 unsigned int newidle_idx
;
689 unsigned int wake_idx
;
690 unsigned int forkexec_idx
;
691 int flags
; /* See SD_* */
693 /* Runtime fields. */
694 unsigned long last_balance
; /* init to jiffies. units in jiffies */
695 unsigned int balance_interval
; /* initialise to 1. units in ms. */
696 unsigned int nr_balance_failed
; /* initialise to 0 */
698 #ifdef CONFIG_SCHEDSTATS
699 /* load_balance() stats */
700 unsigned long lb_cnt
[MAX_IDLE_TYPES
];
701 unsigned long lb_failed
[MAX_IDLE_TYPES
];
702 unsigned long lb_balanced
[MAX_IDLE_TYPES
];
703 unsigned long lb_imbalance
[MAX_IDLE_TYPES
];
704 unsigned long lb_gained
[MAX_IDLE_TYPES
];
705 unsigned long lb_hot_gained
[MAX_IDLE_TYPES
];
706 unsigned long lb_nobusyg
[MAX_IDLE_TYPES
];
707 unsigned long lb_nobusyq
[MAX_IDLE_TYPES
];
709 /* Active load balancing */
710 unsigned long alb_cnt
;
711 unsigned long alb_failed
;
712 unsigned long alb_pushed
;
714 /* SD_BALANCE_EXEC stats */
715 unsigned long sbe_cnt
;
716 unsigned long sbe_balanced
;
717 unsigned long sbe_pushed
;
719 /* SD_BALANCE_FORK stats */
720 unsigned long sbf_cnt
;
721 unsigned long sbf_balanced
;
722 unsigned long sbf_pushed
;
724 /* try_to_wake_up() stats */
725 unsigned long ttwu_wake_remote
;
726 unsigned long ttwu_move_affine
;
727 unsigned long ttwu_move_balance
;
731 extern int partition_sched_domains(cpumask_t
*partition1
,
732 cpumask_t
*partition2
);
735 * Maximum cache size the migration-costs auto-tuning code will
738 extern unsigned int max_cache_size
;
740 #endif /* CONFIG_SMP */
743 struct io_context
; /* See blkdev.h */
746 #define NGROUPS_SMALL 32
747 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
751 gid_t small_block
[NGROUPS_SMALL
];
757 * get_group_info() must be called with the owning task locked (via task_lock())
758 * when task != current. The reason being that the vast majority of callers are
759 * looking at current->group_info, which can not be changed except by the
760 * current task. Changing current->group_info requires the task lock, too.
762 #define get_group_info(group_info) do { \
763 atomic_inc(&(group_info)->usage); \
766 #define put_group_info(group_info) do { \
767 if (atomic_dec_and_test(&(group_info)->usage)) \
768 groups_free(group_info); \
771 extern struct group_info
*groups_alloc(int gidsetsize
);
772 extern void groups_free(struct group_info
*group_info
);
773 extern int set_current_groups(struct group_info
*group_info
);
774 extern int groups_search(struct group_info
*group_info
, gid_t grp
);
775 /* access the groups "array" with this macro */
776 #define GROUP_AT(gi, i) \
777 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
779 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
780 extern void prefetch_stack(struct task_struct
*t
);
782 static inline void prefetch_stack(struct task_struct
*t
) { }
785 struct audit_context
; /* See audit.c */
787 struct pipe_inode_info
;
788 struct uts_namespace
;
792 SLEEP_NONINTERACTIVE
,
800 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
801 struct thread_info
*thread_info
;
803 unsigned long flags
; /* per process flags, defined below */
804 unsigned long ptrace
;
806 int lock_depth
; /* BKL lock depth */
809 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
813 int load_weight
; /* for niceness load balancing purposes */
814 int prio
, static_prio
, normal_prio
;
815 struct list_head run_list
;
816 struct prio_array
*array
;
818 unsigned short ioprio
;
819 #ifdef CONFIG_BLK_DEV_IO_TRACE
820 unsigned int btrace_seq
;
822 unsigned long sleep_avg
;
823 unsigned long long timestamp
, last_ran
;
824 unsigned long long sched_time
; /* sched_clock time spent running */
825 enum sleep_type sleep_type
;
827 unsigned long policy
;
828 cpumask_t cpus_allowed
;
829 unsigned int time_slice
, first_time_slice
;
831 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
832 struct sched_info sched_info
;
835 struct list_head tasks
;
837 * ptrace_list/ptrace_children forms the list of my children
838 * that were stolen by a ptracer.
840 struct list_head ptrace_children
;
841 struct list_head ptrace_list
;
843 struct mm_struct
*mm
, *active_mm
;
846 struct linux_binfmt
*binfmt
;
848 int exit_code
, exit_signal
;
849 int pdeath_signal
; /* The signal sent when the parent dies */
851 unsigned long personality
;
856 #ifdef CONFIG_CC_STACKPROTECTOR
857 /* Canary value for the -fstack-protector gcc feature */
858 unsigned long stack_canary
;
861 * pointers to (original) parent process, youngest child, younger sibling,
862 * older sibling, respectively. (p->father can be replaced with
865 struct task_struct
*real_parent
; /* real parent process (when being debugged) */
866 struct task_struct
*parent
; /* parent process */
868 * children/sibling forms the list of my children plus the
869 * tasks I'm ptracing.
871 struct list_head children
; /* list of my children */
872 struct list_head sibling
; /* linkage in my parent's children list */
873 struct task_struct
*group_leader
; /* threadgroup leader */
875 /* PID/PID hash table linkage. */
876 struct pid_link pids
[PIDTYPE_MAX
];
877 struct list_head thread_group
;
879 struct completion
*vfork_done
; /* for vfork() */
880 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
881 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
883 unsigned long rt_priority
;
884 cputime_t utime
, stime
;
885 unsigned long nvcsw
, nivcsw
; /* context switch counts */
886 struct timespec start_time
;
887 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
888 unsigned long min_flt
, maj_flt
;
890 cputime_t it_prof_expires
, it_virt_expires
;
891 unsigned long long it_sched_expires
;
892 struct list_head cpu_timers
[3];
894 /* process credentials */
895 uid_t uid
,euid
,suid
,fsuid
;
896 gid_t gid
,egid
,sgid
,fsgid
;
897 struct group_info
*group_info
;
898 kernel_cap_t cap_effective
, cap_inheritable
, cap_permitted
;
899 unsigned keep_capabilities
:1;
900 struct user_struct
*user
;
902 struct key
*request_key_auth
; /* assumed request_key authority */
903 struct key
*thread_keyring
; /* keyring private to this thread */
904 unsigned char jit_keyring
; /* default keyring to attach requested keys to */
907 * fpu_counter contains the number of consecutive context switches
908 * that the FPU is used. If this is over a threshold, the lazy fpu
909 * saving becomes unlazy to save the trap. This is an unsigned char
910 * so that after 256 times the counter wraps and the behavior turns
911 * lazy again; this to deal with bursty apps that only use FPU for
914 unsigned char fpu_counter
;
915 int oomkilladj
; /* OOM kill score adjustment (bit shift). */
916 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
917 - access with [gs]et_task_comm (which lock
919 - initialized normally by flush_old_exec */
920 /* file system info */
921 int link_count
, total_link_count
;
922 #ifdef CONFIG_SYSVIPC
924 struct sysv_sem sysvsem
;
926 /* CPU-specific state of this task */
927 struct thread_struct thread
;
928 /* filesystem information */
929 struct fs_struct
*fs
;
930 /* open file information */
931 struct files_struct
*files
;
933 struct nsproxy
*nsproxy
;
934 /* signal handlers */
935 struct signal_struct
*signal
;
936 struct sighand_struct
*sighand
;
938 sigset_t blocked
, real_blocked
;
939 sigset_t saved_sigmask
; /* To be restored with TIF_RESTORE_SIGMASK */
940 struct sigpending pending
;
942 unsigned long sas_ss_sp
;
944 int (*notifier
)(void *priv
);
946 sigset_t
*notifier_mask
;
949 struct audit_context
*audit_context
;
952 /* Thread group tracking */
955 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
956 spinlock_t alloc_lock
;
958 /* Protection of the PI data structures: */
961 #ifdef CONFIG_RT_MUTEXES
962 /* PI waiters blocked on a rt_mutex held by this task */
963 struct plist_head pi_waiters
;
964 /* Deadlock detection and priority inheritance handling */
965 struct rt_mutex_waiter
*pi_blocked_on
;
968 #ifdef CONFIG_DEBUG_MUTEXES
969 /* mutex deadlock detection */
970 struct mutex_waiter
*blocked_on
;
972 #ifdef CONFIG_TRACE_IRQFLAGS
973 unsigned int irq_events
;
974 int hardirqs_enabled
;
975 unsigned long hardirq_enable_ip
;
976 unsigned int hardirq_enable_event
;
977 unsigned long hardirq_disable_ip
;
978 unsigned int hardirq_disable_event
;
979 int softirqs_enabled
;
980 unsigned long softirq_disable_ip
;
981 unsigned int softirq_disable_event
;
982 unsigned long softirq_enable_ip
;
983 unsigned int softirq_enable_event
;
987 #ifdef CONFIG_LOCKDEP
988 # define MAX_LOCK_DEPTH 30UL
991 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
992 unsigned int lockdep_recursion
;
995 /* journalling filesystem info */
999 struct reclaim_state
*reclaim_state
;
1001 struct backing_dev_info
*backing_dev_info
;
1003 struct io_context
*io_context
;
1005 unsigned long ptrace_message
;
1006 siginfo_t
*last_siginfo
; /* For ptrace use. */
1008 * current io wait handle: wait queue entry to use for io waits
1009 * If this thread is processing aio, this points at the waitqueue
1010 * inside the currently handled kiocb. It may be NULL (i.e. default
1011 * to a stack based synchronous wait) if its doing sync IO.
1013 wait_queue_t
*io_wait
;
1014 /* i/o counters(bytes read/written, #syscalls */
1015 u64 rchar
, wchar
, syscr
, syscw
;
1016 #if defined(CONFIG_TASK_XACCT)
1017 u64 acct_rss_mem1
; /* accumulated rss usage */
1018 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1019 cputime_t acct_stimexpd
;/* stime since last update */
1022 struct mempolicy
*mempolicy
;
1025 #ifdef CONFIG_CPUSETS
1026 struct cpuset
*cpuset
;
1027 nodemask_t mems_allowed
;
1028 int cpuset_mems_generation
;
1029 int cpuset_mem_spread_rotor
;
1031 struct robust_list_head __user
*robust_list
;
1032 #ifdef CONFIG_COMPAT
1033 struct compat_robust_list_head __user
*compat_robust_list
;
1035 struct list_head pi_state_list
;
1036 struct futex_pi_state
*pi_state_cache
;
1038 atomic_t fs_excl
; /* holding fs exclusive resources */
1039 struct rcu_head rcu
;
1042 * cache last used pipe for splice
1044 struct pipe_inode_info
*splice_pipe
;
1045 #ifdef CONFIG_TASK_DELAY_ACCT
1046 struct task_delay_info
*delays
;
1048 #ifdef CONFIG_FAULT_INJECTION
1053 static inline pid_t
process_group(struct task_struct
*tsk
)
1055 return tsk
->signal
->pgrp
;
1058 static inline pid_t
signal_session(struct signal_struct
*sig
)
1060 return sig
->__session
;
1063 static inline pid_t
process_session(struct task_struct
*tsk
)
1065 return signal_session(tsk
->signal
);
1068 static inline void set_signal_session(struct signal_struct
*sig
, pid_t session
)
1070 sig
->__session
= session
;
1073 static inline struct pid
*task_pid(struct task_struct
*task
)
1075 return task
->pids
[PIDTYPE_PID
].pid
;
1078 static inline struct pid
*task_tgid(struct task_struct
*task
)
1080 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1083 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1085 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1088 static inline struct pid
*task_session(struct task_struct
*task
)
1090 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1094 * pid_alive - check that a task structure is not stale
1095 * @p: Task structure to be checked.
1097 * Test if a process is not yet dead (at most zombie state)
1098 * If pid_alive fails, then pointers within the task structure
1099 * can be stale and must not be dereferenced.
1101 static inline int pid_alive(struct task_struct
*p
)
1103 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1107 * is_init - check if a task structure is init
1108 * @tsk: Task structure to be checked.
1110 * Check if a task structure is the first user space task the kernel created.
1112 static inline int is_init(struct task_struct
*tsk
)
1114 return tsk
->pid
== 1;
1117 extern struct pid
*cad_pid
;
1119 extern void free_task(struct task_struct
*tsk
);
1120 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1122 extern void __put_task_struct(struct task_struct
*t
);
1124 static inline void put_task_struct(struct task_struct
*t
)
1126 if (atomic_dec_and_test(&t
->usage
))
1127 __put_task_struct(t
);
1133 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1134 /* Not implemented yet, only for 486*/
1135 #define PF_STARTING 0x00000002 /* being created */
1136 #define PF_EXITING 0x00000004 /* getting shut down */
1137 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1138 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1139 #define PF_DUMPCORE 0x00000200 /* dumped core */
1140 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1141 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1142 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1143 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1144 #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
1145 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1146 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1147 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1148 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1149 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1150 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1151 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1152 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1153 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1154 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1155 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1156 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1157 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1160 * Only the _current_ task can read/write to tsk->flags, but other
1161 * tasks can access tsk->flags in readonly mode for example
1162 * with tsk_used_math (like during threaded core dumping).
1163 * There is however an exception to this rule during ptrace
1164 * or during fork: the ptracer task is allowed to write to the
1165 * child->flags of its traced child (same goes for fork, the parent
1166 * can write to the child->flags), because we're guaranteed the
1167 * child is not running and in turn not changing child->flags
1168 * at the same time the parent does it.
1170 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1171 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1172 #define clear_used_math() clear_stopped_child_used_math(current)
1173 #define set_used_math() set_stopped_child_used_math(current)
1174 #define conditional_stopped_child_used_math(condition, child) \
1175 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1176 #define conditional_used_math(condition) \
1177 conditional_stopped_child_used_math(condition, current)
1178 #define copy_to_stopped_child_used_math(child) \
1179 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1180 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1181 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1182 #define used_math() tsk_used_math(current)
1185 extern int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
);
1187 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1189 if (!cpu_isset(0, new_mask
))
1195 extern unsigned long long sched_clock(void);
1196 extern unsigned long long
1197 current_sched_time(const struct task_struct
*current_task
);
1199 /* sched_exec is called by processes performing an exec */
1201 extern void sched_exec(void);
1203 #define sched_exec() {}
1206 #ifdef CONFIG_HOTPLUG_CPU
1207 extern void idle_task_exit(void);
1209 static inline void idle_task_exit(void) {}
1212 extern void sched_idle_next(void);
1214 #ifdef CONFIG_RT_MUTEXES
1215 extern int rt_mutex_getprio(struct task_struct
*p
);
1216 extern void rt_mutex_setprio(struct task_struct
*p
, int prio
);
1217 extern void rt_mutex_adjust_pi(struct task_struct
*p
);
1219 static inline int rt_mutex_getprio(struct task_struct
*p
)
1221 return p
->normal_prio
;
1223 # define rt_mutex_adjust_pi(p) do { } while (0)
1226 extern void set_user_nice(struct task_struct
*p
, long nice
);
1227 extern int task_prio(const struct task_struct
*p
);
1228 extern int task_nice(const struct task_struct
*p
);
1229 extern int can_nice(const struct task_struct
*p
, const int nice
);
1230 extern int task_curr(const struct task_struct
*p
);
1231 extern int idle_cpu(int cpu
);
1232 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
1233 extern struct task_struct
*idle_task(int cpu
);
1234 extern struct task_struct
*curr_task(int cpu
);
1235 extern void set_curr_task(int cpu
, struct task_struct
*p
);
1240 * The default (Linux) execution domain.
1242 extern struct exec_domain default_exec_domain
;
1244 union thread_union
{
1245 struct thread_info thread_info
;
1246 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1249 #ifndef __HAVE_ARCH_KSTACK_END
1250 static inline int kstack_end(void *addr
)
1252 /* Reliable end of stack detection:
1253 * Some APM bios versions misalign the stack
1255 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1259 extern union thread_union init_thread_union
;
1260 extern struct task_struct init_task
;
1262 extern struct mm_struct init_mm
;
1264 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1265 extern struct task_struct
*find_task_by_pid_type(int type
, int pid
);
1266 extern void __set_special_pids(pid_t session
, pid_t pgrp
);
1268 /* per-UID process charging. */
1269 extern struct user_struct
* alloc_uid(uid_t
);
1270 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1272 atomic_inc(&u
->__count
);
1275 extern void free_uid(struct user_struct
*);
1276 extern void switch_uid(struct user_struct
*);
1278 #include <asm/current.h>
1280 extern void do_timer(unsigned long ticks
);
1282 extern int FASTCALL(wake_up_state(struct task_struct
* tsk
, unsigned int state
));
1283 extern int FASTCALL(wake_up_process(struct task_struct
* tsk
));
1284 extern void FASTCALL(wake_up_new_task(struct task_struct
* tsk
,
1285 unsigned long clone_flags
));
1287 extern void kick_process(struct task_struct
*tsk
);
1289 static inline void kick_process(struct task_struct
*tsk
) { }
1291 extern void FASTCALL(sched_fork(struct task_struct
* p
, int clone_flags
));
1292 extern void FASTCALL(sched_exit(struct task_struct
* p
));
1294 extern int in_group_p(gid_t
);
1295 extern int in_egroup_p(gid_t
);
1297 extern void proc_caches_init(void);
1298 extern void flush_signals(struct task_struct
*);
1299 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
1300 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
1302 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
1304 unsigned long flags
;
1307 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
1308 ret
= dequeue_signal(tsk
, mask
, info
);
1309 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
1314 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
1316 extern void unblock_all_signals(void);
1317 extern void release_task(struct task_struct
* p
);
1318 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
1319 extern int send_group_sig_info(int, struct siginfo
*, struct task_struct
*);
1320 extern int force_sigsegv(int, struct task_struct
*);
1321 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
1322 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
1323 extern int kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
1324 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
1325 extern int kill_pid_info_as_uid(int, struct siginfo
*, struct pid
*, uid_t
, uid_t
, u32
);
1326 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
1327 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
1328 extern int __kill_pg_info(int sig
, struct siginfo
*info
, pid_t pgrp
);
1329 extern int kill_pg_info(int, struct siginfo
*, pid_t
);
1330 extern void do_notify_parent(struct task_struct
*, int);
1331 extern void force_sig(int, struct task_struct
*);
1332 extern void force_sig_specific(int, struct task_struct
*);
1333 extern int send_sig(int, struct task_struct
*, int);
1334 extern void zap_other_threads(struct task_struct
*p
);
1335 extern int kill_pg(pid_t
, int, int);
1336 extern int kill_proc(pid_t
, int, int);
1337 extern struct sigqueue
*sigqueue_alloc(void);
1338 extern void sigqueue_free(struct sigqueue
*);
1339 extern int send_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1340 extern int send_group_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1341 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
1342 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
1344 static inline int kill_cad_pid(int sig
, int priv
)
1346 return kill_pid(cad_pid
, sig
, priv
);
1349 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1350 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1351 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1352 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1354 static inline int is_si_special(const struct siginfo
*info
)
1356 return info
<= SEND_SIG_FORCED
;
1359 /* True if we are on the alternate signal stack. */
1361 static inline int on_sig_stack(unsigned long sp
)
1363 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
1366 static inline int sas_ss_flags(unsigned long sp
)
1368 return (current
->sas_ss_size
== 0 ? SS_DISABLE
1369 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
1373 * Routines for handling mm_structs
1375 extern struct mm_struct
* mm_alloc(void);
1377 /* mmdrop drops the mm and the page tables */
1378 extern void FASTCALL(__mmdrop(struct mm_struct
*));
1379 static inline void mmdrop(struct mm_struct
* mm
)
1381 if (atomic_dec_and_test(&mm
->mm_count
))
1385 /* mmput gets rid of the mappings and all user-space */
1386 extern void mmput(struct mm_struct
*);
1387 /* Grab a reference to a task's mm, if it is not already going away */
1388 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
1389 /* Remove the current tasks stale references to the old mm_struct */
1390 extern void mm_release(struct task_struct
*, struct mm_struct
*);
1392 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct
*, struct pt_regs
*);
1393 extern void flush_thread(void);
1394 extern void exit_thread(void);
1396 extern void exit_files(struct task_struct
*);
1397 extern void __cleanup_signal(struct signal_struct
*);
1398 extern void __cleanup_sighand(struct sighand_struct
*);
1399 extern void exit_itimers(struct signal_struct
*);
1401 extern NORET_TYPE
void do_group_exit(int);
1403 extern void daemonize(const char *, ...);
1404 extern int allow_signal(int);
1405 extern int disallow_signal(int);
1407 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
1408 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
1409 struct task_struct
*fork_idle(int);
1411 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
1412 extern void get_task_comm(char *to
, struct task_struct
*tsk
);
1415 extern void wait_task_inactive(struct task_struct
* p
);
1417 #define wait_task_inactive(p) do { } while (0)
1420 #define remove_parent(p) list_del_init(&(p)->sibling)
1421 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1423 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1425 #define for_each_process(p) \
1426 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1429 * Careful: do_each_thread/while_each_thread is a double loop so
1430 * 'break' will not work as expected - use goto instead.
1432 #define do_each_thread(g, t) \
1433 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1435 #define while_each_thread(g, t) \
1436 while ((t = next_thread(t)) != g)
1438 /* de_thread depends on thread_group_leader not being a pid based check */
1439 #define thread_group_leader(p) (p == p->group_leader)
1441 /* Do to the insanities of de_thread it is possible for a process
1442 * to have the pid of the thread group leader without actually being
1443 * the thread group leader. For iteration through the pids in proc
1444 * all we care about is that we have a task with the appropriate
1445 * pid, we don't actually care if we have the right task.
1447 static inline int has_group_leader_pid(struct task_struct
*p
)
1449 return p
->pid
== p
->tgid
;
1452 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
1454 return list_entry(rcu_dereference(p
->thread_group
.next
),
1455 struct task_struct
, thread_group
);
1458 static inline int thread_group_empty(struct task_struct
*p
)
1460 return list_empty(&p
->thread_group
);
1463 #define delay_group_leader(p) \
1464 (thread_group_leader(p) && !thread_group_empty(p))
1467 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1468 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1469 * pins the final release of task.io_context. Also protects ->cpuset.
1471 * Nests both inside and outside of read_lock(&tasklist_lock).
1472 * It must not be nested with write_lock_irq(&tasklist_lock),
1473 * neither inside nor outside.
1475 static inline void task_lock(struct task_struct
*p
)
1477 spin_lock(&p
->alloc_lock
);
1480 static inline void task_unlock(struct task_struct
*p
)
1482 spin_unlock(&p
->alloc_lock
);
1485 extern struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
1486 unsigned long *flags
);
1488 static inline void unlock_task_sighand(struct task_struct
*tsk
,
1489 unsigned long *flags
)
1491 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
1494 #ifndef __HAVE_THREAD_FUNCTIONS
1496 #define task_thread_info(task) (task)->thread_info
1497 #define task_stack_page(task) ((void*)((task)->thread_info))
1499 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
1501 *task_thread_info(p
) = *task_thread_info(org
);
1502 task_thread_info(p
)->task
= p
;
1505 static inline unsigned long *end_of_stack(struct task_struct
*p
)
1507 return (unsigned long *)(p
->thread_info
+ 1);
1512 /* set thread flags in other task's structures
1513 * - see asm/thread_info.h for TIF_xxxx flags available
1515 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1517 set_ti_thread_flag(task_thread_info(tsk
), flag
);
1520 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1522 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1525 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1527 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
1530 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1532 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1535 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1537 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
1540 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
1542 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1545 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
1547 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1550 static inline int signal_pending(struct task_struct
*p
)
1552 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
1555 static inline int need_resched(void)
1557 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
1561 * cond_resched() and cond_resched_lock(): latency reduction via
1562 * explicit rescheduling in places that are safe. The return
1563 * value indicates whether a reschedule was done in fact.
1564 * cond_resched_lock() will drop the spinlock before scheduling,
1565 * cond_resched_softirq() will enable bhs before scheduling.
1567 extern int cond_resched(void);
1568 extern int cond_resched_lock(spinlock_t
* lock
);
1569 extern int cond_resched_softirq(void);
1572 * Does a critical section need to be broken due to another
1575 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1576 # define need_lockbreak(lock) ((lock)->break_lock)
1578 # define need_lockbreak(lock) 0
1582 * Does a critical section need to be broken due to another
1583 * task waiting or preemption being signalled:
1585 static inline int lock_need_resched(spinlock_t
*lock
)
1587 if (need_lockbreak(lock
) || need_resched())
1592 /* Reevaluate whether the task has signals pending delivery.
1593 This is required every time the blocked sigset_t changes.
1594 callers must hold sighand->siglock. */
1596 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct
*t
));
1597 extern void recalc_sigpending(void);
1599 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
1602 * Wrappers for p->thread_info->cpu access. No-op on UP.
1606 static inline unsigned int task_cpu(const struct task_struct
*p
)
1608 return task_thread_info(p
)->cpu
;
1611 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1613 task_thread_info(p
)->cpu
= cpu
;
1618 static inline unsigned int task_cpu(const struct task_struct
*p
)
1623 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1627 #endif /* CONFIG_SMP */
1629 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1630 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
1632 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
)
1634 mm
->mmap_base
= TASK_UNMAPPED_BASE
;
1635 mm
->get_unmapped_area
= arch_get_unmapped_area
;
1636 mm
->unmap_area
= arch_unmap_area
;
1640 extern long sched_setaffinity(pid_t pid
, cpumask_t new_mask
);
1641 extern long sched_getaffinity(pid_t pid
, cpumask_t
*mask
);
1643 #include <linux/sysdev.h>
1644 extern int sched_mc_power_savings
, sched_smt_power_savings
;
1645 extern struct sysdev_attribute attr_sched_mc_power_savings
, attr_sched_smt_power_savings
;
1646 extern int sched_create_sysfs_power_savings_entries(struct sysdev_class
*cls
);
1648 extern void normalize_rt_tasks(void);
1650 #endif /* __KERNEL__ */