4 #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
9 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
10 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
11 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
12 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
13 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
14 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
15 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
16 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
17 #define CLONE_THREAD 0x00010000 /* Same thread group? */
18 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
19 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
20 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
21 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
22 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
23 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
24 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
25 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
26 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
27 #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
28 #define CLONE_NEWIPC 0x08000000 /* New ipcs */
33 #define SCHED_NORMAL 0
37 /* SCHED_ISO: reserved but not implemented yet */
46 #include <asm/param.h> /* for HZ */
48 #include <linux/capability.h>
49 #include <linux/threads.h>
50 #include <linux/kernel.h>
51 #include <linux/types.h>
52 #include <linux/timex.h>
53 #include <linux/jiffies.h>
54 #include <linux/rbtree.h>
55 #include <linux/thread_info.h>
56 #include <linux/cpumask.h>
57 #include <linux/errno.h>
58 #include <linux/nodemask.h>
60 #include <asm/system.h>
61 #include <asm/semaphore.h>
63 #include <asm/ptrace.h>
65 #include <asm/cputime.h>
67 #include <linux/smp.h>
68 #include <linux/sem.h>
69 #include <linux/signal.h>
70 #include <linux/securebits.h>
71 #include <linux/fs_struct.h>
72 #include <linux/compiler.h>
73 #include <linux/completion.h>
74 #include <linux/pid.h>
75 #include <linux/percpu.h>
76 #include <linux/topology.h>
77 #include <linux/seccomp.h>
78 #include <linux/rcupdate.h>
79 #include <linux/futex.h>
80 #include <linux/rtmutex.h>
82 #include <linux/time.h>
83 #include <linux/param.h>
84 #include <linux/resource.h>
85 #include <linux/timer.h>
86 #include <linux/hrtimer.h>
87 #include <linux/task_io_accounting.h>
89 #include <asm/processor.h>
92 struct futex_pi_state;
96 * List of flags we want to share for kernel threads,
97 * if only because they are not used by them anyway.
99 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
102 * These are the constant used to fake the fixed-point load-average
103 * counting. Some notes:
104 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
105 * a load-average precision of 10 bits integer + 11 bits fractional
106 * - if you want to count load-averages more often, you need more
107 * precision, or rounding will get you. With 2-second counting freq,
108 * the EXP_n values would be 1981, 2034 and 2043 if still using only
111 extern unsigned long avenrun[]; /* Load averages */
113 #define FSHIFT 11 /* nr of bits of precision */
114 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
115 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
116 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
117 #define EXP_5 2014 /* 1/exp(5sec/5min) */
118 #define EXP_15 2037 /* 1/exp(5sec/15min) */
120 #define CALC_LOAD(load,exp,n) \
122 load += n*(FIXED_1-exp); \
125 extern unsigned long total_forks;
126 extern int nr_threads;
127 DECLARE_PER_CPU(unsigned long, process_counts);
128 extern int nr_processes(void);
129 extern unsigned long nr_running(void);
130 extern unsigned long nr_uninterruptible(void);
131 extern unsigned long nr_active(void);
132 extern unsigned long nr_iowait(void);
133 extern unsigned long weighted_cpuload(const int cpu);
137 * Task state bitmask. NOTE! These bits are also
138 * encoded in fs/proc/array.c: get_task_state().
140 * We have two separate sets of flags: task->state
141 * is about runnability, while task->exit_state are
142 * about the task exiting. Confusing, but this way
143 * modifying one set can't modify the other one by
146 #define TASK_RUNNING 0
147 #define TASK_INTERRUPTIBLE 1
148 #define TASK_UNINTERRUPTIBLE 2
149 #define TASK_STOPPED 4
150 #define TASK_TRACED 8
151 /* in tsk->exit_state */
152 #define EXIT_ZOMBIE 16
154 /* in tsk->state again */
155 #define TASK_NONINTERACTIVE 64
156 #define TASK_DEAD 128
158 #define __set_task_state(tsk, state_value) \
159 do { (tsk)->state = (state_value); } while (0)
160 #define set_task_state(tsk, state_value) \
161 set_mb((tsk)->state, (state_value))
164 * set_current_state() includes a barrier so that the write of current->state
165 * is correctly serialised wrt the caller's subsequent test of whether to
168 * set_current_state(TASK_UNINTERRUPTIBLE);
169 * if (do_i_need_to_sleep())
172 * If the caller does not need such serialisation then use __set_current_state()
174 #define __set_current_state(state_value) \
175 do { current->state = (state_value); } while (0)
176 #define set_current_state(state_value) \
177 set_mb(current->state, (state_value))
179 /* Task command name length */
180 #define TASK_COMM_LEN 16
182 #include <linux/spinlock.h>
185 * This serializes "schedule()" and also protects
186 * the run-queue from deletions/modifications (but
187 * _adding_ to the beginning of the run-queue has
190 extern rwlock_t tasklist_lock;
191 extern spinlock_t mmlist_lock;
195 extern void sched_init(void);
196 extern void sched_init_smp(void);
197 extern void init_idle(struct task_struct *idle, int cpu);
198 extern void init_idle_bootup_task(struct task_struct *idle);
200 extern cpumask_t nohz_cpu_mask;
201 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
202 extern int select_nohz_load_balancer(int cpu);
204 static inline int select_nohz_load_balancer(int cpu)
211 * Only dump TASK_* tasks. (0 for all tasks)
213 extern void show_state_filter(unsigned long state_filter);
215 static inline void show_state(void)
217 show_state_filter(0);
220 extern void show_regs(struct pt_regs *);
223 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
224 * task), SP is the stack pointer of the first frame that should be shown in the back
225 * trace (or NULL if the entire call-chain of the task should be shown).
227 extern void show_stack(struct task_struct *task, unsigned long *sp);
229 void io_schedule(void);
230 long io_schedule_timeout(long timeout);
232 extern void cpu_init (void);
233 extern void trap_init(void);
234 extern void update_process_times(int user);
235 extern void scheduler_tick(void);
237 #ifdef CONFIG_DETECT_SOFTLOCKUP
238 extern void softlockup_tick(void);
239 extern void spawn_softlockup_task(void);
240 extern void touch_softlockup_watchdog(void);
241 extern void touch_all_softlockup_watchdogs(void);
243 static inline void softlockup_tick(void)
246 static inline void spawn_softlockup_task(void)
249 static inline void touch_softlockup_watchdog(void)
252 static inline void touch_all_softlockup_watchdogs(void)
258 /* Attach to any functions which should be ignored in wchan output. */
259 #define __sched __attribute__((__section__(".sched.text")))
260 /* Is this address in the __sched functions? */
261 extern int in_sched_functions(unsigned long addr);
263 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
264 extern signed long FASTCALL(schedule_timeout(signed long timeout));
265 extern signed long schedule_timeout_interruptible(signed long timeout);
266 extern signed long schedule_timeout_uninterruptible(signed long timeout);
267 asmlinkage void schedule(void);
271 /* Maximum number of active map areas.. This is a random (large) number */
272 #define DEFAULT_MAX_MAP_COUNT 65536
274 extern int sysctl_max_map_count;
276 #include <linux/aio.h>
279 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
280 unsigned long, unsigned long);
282 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
283 unsigned long len, unsigned long pgoff,
284 unsigned long flags);
285 extern void arch_unmap_area(struct mm_struct *, unsigned long);
286 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
288 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
290 * The mm counters are not protected by its page_table_lock,
291 * so must be incremented atomically.
293 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
294 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
295 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
296 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
297 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
298 typedef atomic_long_t mm_counter_t;
300 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
302 * The mm counters are protected by its page_table_lock,
303 * so can be incremented directly.
305 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
306 #define get_mm_counter(mm, member) ((mm)->_##member)
307 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
308 #define inc_mm_counter(mm, member) (mm)->_##member++
309 #define dec_mm_counter(mm, member) (mm)->_##member--
310 typedef unsigned long mm_counter_t;
312 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
314 #define get_mm_rss(mm) \
315 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
316 #define update_hiwater_rss(mm) do { \
317 unsigned long _rss = get_mm_rss(mm); \
318 if ((mm)->hiwater_rss < _rss) \
319 (mm)->hiwater_rss = _rss; \
321 #define update_hiwater_vm(mm) do { \
322 if ((mm)->hiwater_vm < (mm)->total_vm) \
323 (mm)->hiwater_vm = (mm)->total_vm; \
327 struct vm_area_struct * mmap; /* list of VMAs */
328 struct rb_root mm_rb;
329 struct vm_area_struct * mmap_cache; /* last find_vma result */
330 unsigned long (*get_unmapped_area) (struct file *filp,
331 unsigned long addr, unsigned long len,
332 unsigned long pgoff, unsigned long flags);
333 void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
334 unsigned long mmap_base; /* base of mmap area */
335 unsigned long task_size; /* size of task vm space */
336 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
337 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
339 atomic_t mm_users; /* How many users with user space? */
340 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
341 int map_count; /* number of VMAs */
342 struct rw_semaphore mmap_sem;
343 spinlock_t page_table_lock; /* Protects page tables and some counters */
345 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
346 * together off init_mm.mmlist, and are protected
350 /* Special counters, in some configurations protected by the
351 * page_table_lock, in other configurations by being atomic.
353 mm_counter_t _file_rss;
354 mm_counter_t _anon_rss;
356 unsigned long hiwater_rss; /* High-watermark of RSS usage */
357 unsigned long hiwater_vm; /* High-water virtual memory usage */
359 unsigned long total_vm, locked_vm, shared_vm, exec_vm;
360 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
361 unsigned long start_code, end_code, start_data, end_data;
362 unsigned long start_brk, brk, start_stack;
363 unsigned long arg_start, arg_end, env_start, env_end;
365 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
367 cpumask_t cpu_vm_mask;
369 /* Architecture-specific MM context */
370 mm_context_t context;
372 /* Swap token stuff */
374 * Last value of global fault stamp as seen by this process.
375 * In other words, this value gives an indication of how long
376 * it has been since this task got the token.
377 * Look at mm/thrash.c
379 unsigned int faultstamp;
380 unsigned int token_priority;
381 unsigned int last_interval;
383 unsigned char dumpable:2;
385 /* coredumping support */
387 struct completion *core_startup_done, core_done;
390 rwlock_t ioctx_list_lock;
391 struct kioctx *ioctx_list;
394 struct sighand_struct {
396 struct k_sigaction action[_NSIG];
398 struct list_head signalfd_list;
401 struct pacct_struct {
404 unsigned long ac_mem;
405 cputime_t ac_utime, ac_stime;
406 unsigned long ac_minflt, ac_majflt;
410 * NOTE! "signal_struct" does not have it's own
411 * locking, because a shared signal_struct always
412 * implies a shared sighand_struct, so locking
413 * sighand_struct is always a proper superset of
414 * the locking of signal_struct.
416 struct signal_struct {
420 wait_queue_head_t wait_chldexit; /* for wait4() */
422 /* current thread group signal load-balancing target: */
423 struct task_struct *curr_target;
425 /* shared signal handling: */
426 struct sigpending shared_pending;
428 /* thread group exit support */
431 * - notify group_exit_task when ->count is equal to notify_count
432 * - everyone except group_exit_task is stopped during signal delivery
433 * of fatal signals, group_exit_task processes the signal.
435 struct task_struct *group_exit_task;
438 /* thread group stop support, overloads group_exit_code too */
439 int group_stop_count;
440 unsigned int flags; /* see SIGNAL_* flags below */
442 /* POSIX.1b Interval Timers */
443 struct list_head posix_timers;
445 /* ITIMER_REAL timer for the process */
446 struct hrtimer real_timer;
447 struct task_struct *tsk;
448 ktime_t it_real_incr;
450 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
451 cputime_t it_prof_expires, it_virt_expires;
452 cputime_t it_prof_incr, it_virt_incr;
454 /* job control IDs */
456 struct pid *tty_old_pgrp;
459 pid_t session __deprecated;
463 /* boolean value for session group leader */
466 struct tty_struct *tty; /* NULL if no tty */
469 * Cumulative resource counters for dead threads in the group,
470 * and for reaped dead child processes forked by this group.
471 * Live threads maintain their own counters and add to these
472 * in __exit_signal, except for the group leader.
474 cputime_t utime, stime, cutime, cstime;
475 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
476 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
477 unsigned long inblock, oublock, cinblock, coublock;
480 * Cumulative ns of scheduled CPU time for dead threads in the
481 * group, not including a zombie group leader. (This only differs
482 * from jiffies_to_ns(utime + stime) if sched_clock uses something
483 * other than jiffies.)
485 unsigned long long sched_time;
488 * We don't bother to synchronize most readers of this at all,
489 * because there is no reader checking a limit that actually needs
490 * to get both rlim_cur and rlim_max atomically, and either one
491 * alone is a single word that can safely be read normally.
492 * getrlimit/setrlimit use task_lock(current->group_leader) to
493 * protect this instead of the siglock, because they really
494 * have no need to disable irqs.
496 struct rlimit rlim[RLIM_NLIMITS];
498 struct list_head cpu_timers[3];
500 /* keep the process-shared keyrings here so that they do the right
501 * thing in threads created with CLONE_THREAD */
503 struct key *session_keyring; /* keyring inherited over fork */
504 struct key *process_keyring; /* keyring private to this process */
506 #ifdef CONFIG_BSD_PROCESS_ACCT
507 struct pacct_struct pacct; /* per-process accounting information */
509 #ifdef CONFIG_TASKSTATS
510 struct taskstats *stats;
514 /* Context switch must be unlocked if interrupts are to be enabled */
515 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
516 # define __ARCH_WANT_UNLOCKED_CTXSW
520 * Bits in flags field of signal_struct.
522 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
523 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
524 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
525 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
529 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
530 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
531 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
532 * values are inverted: lower p->prio value means higher priority.
534 * The MAX_USER_RT_PRIO value allows the actual maximum
535 * RT priority to be separate from the value exported to
536 * user-space. This allows kernel threads to set their
537 * priority to a value higher than any user task. Note:
538 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
541 #define MAX_USER_RT_PRIO 100
542 #define MAX_RT_PRIO MAX_USER_RT_PRIO
544 #define MAX_PRIO (MAX_RT_PRIO + 40)
546 #define rt_prio(prio) unlikely((prio) < MAX_RT_PRIO)
547 #define rt_task(p) rt_prio((p)->prio)
548 #define batch_task(p) (unlikely((p)->policy == SCHED_BATCH))
549 #define is_rt_policy(p) ((p) != SCHED_NORMAL && (p) != SCHED_BATCH)
550 #define has_rt_policy(p) unlikely(is_rt_policy((p)->policy))
553 * Some day this will be a full-fledged user tracking system..
556 atomic_t __count; /* reference count */
557 atomic_t processes; /* How many processes does this user have? */
558 atomic_t files; /* How many open files does this user have? */
559 atomic_t sigpending; /* How many pending signals does this user have? */
560 #ifdef CONFIG_INOTIFY_USER
561 atomic_t inotify_watches; /* How many inotify watches does this user have? */
562 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
564 /* protected by mq_lock */
565 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
566 unsigned long locked_shm; /* How many pages of mlocked shm ? */
569 struct key *uid_keyring; /* UID specific keyring */
570 struct key *session_keyring; /* UID's default session keyring */
573 /* Hash table maintenance information */
574 struct list_head uidhash_list;
578 extern struct user_struct *find_user(uid_t);
580 extern struct user_struct root_user;
581 #define INIT_USER (&root_user)
583 struct backing_dev_info;
584 struct reclaim_state;
586 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
588 /* cumulative counters */
589 unsigned long cpu_time, /* time spent on the cpu */
590 run_delay, /* time spent waiting on a runqueue */
591 pcnt; /* # of timeslices run on this cpu */
594 unsigned long last_arrival, /* when we last ran on a cpu */
595 last_queued; /* when we were last queued to run */
597 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
599 #ifdef CONFIG_SCHEDSTATS
600 extern const struct file_operations proc_schedstat_operations;
601 #endif /* CONFIG_SCHEDSTATS */
603 #ifdef CONFIG_TASK_DELAY_ACCT
604 struct task_delay_info {
606 unsigned int flags; /* Private per-task flags */
608 /* For each stat XXX, add following, aligned appropriately
610 * struct timespec XXX_start, XXX_end;
614 * Atomicity of updates to XXX_delay, XXX_count protected by
615 * single lock above (split into XXX_lock if contention is an issue).
619 * XXX_count is incremented on every XXX operation, the delay
620 * associated with the operation is added to XXX_delay.
621 * XXX_delay contains the accumulated delay time in nanoseconds.
623 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
624 u64 blkio_delay; /* wait for sync block io completion */
625 u64 swapin_delay; /* wait for swapin block io completion */
626 u32 blkio_count; /* total count of the number of sync block */
627 /* io operations performed */
628 u32 swapin_count; /* total count of the number of swapin block */
629 /* io operations performed */
631 #endif /* CONFIG_TASK_DELAY_ACCT */
633 static inline int sched_info_on(void)
635 #ifdef CONFIG_SCHEDSTATS
637 #elif defined(CONFIG_TASK_DELAY_ACCT)
638 extern int delayacct_on;
653 * sched-domains (multiprocessor balancing) declarations:
657 * Increase resolution of nice-level calculations:
659 #define SCHED_LOAD_SHIFT 10
660 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
662 #define SCHED_LOAD_SCALE_FUZZ (SCHED_LOAD_SCALE >> 5)
665 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
666 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
667 #define SD_BALANCE_EXEC 4 /* Balance on exec */
668 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
669 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
670 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
671 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
672 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
673 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
674 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
675 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
677 #define BALANCE_FOR_MC_POWER \
678 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
680 #define BALANCE_FOR_PKG_POWER \
681 ((sched_mc_power_savings || sched_smt_power_savings) ? \
682 SD_POWERSAVINGS_BALANCE : 0)
684 #define test_sd_parent(sd, flag) ((sd->parent && \
685 (sd->parent->flags & flag)) ? 1 : 0)
689 struct sched_group *next; /* Must be a circular list */
693 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
694 * single CPU. This is read only (except for setup, hotplug CPU).
695 * Note : Never change cpu_power without recompute its reciprocal
697 unsigned int __cpu_power;
699 * reciprocal value of cpu_power to avoid expensive divides
700 * (see include/linux/reciprocal_div.h)
702 u32 reciprocal_cpu_power;
705 struct sched_domain {
706 /* These fields must be setup */
707 struct sched_domain *parent; /* top domain must be null terminated */
708 struct sched_domain *child; /* bottom domain must be null terminated */
709 struct sched_group *groups; /* the balancing groups of the domain */
710 cpumask_t span; /* span of all CPUs in this domain */
711 unsigned long min_interval; /* Minimum balance interval ms */
712 unsigned long max_interval; /* Maximum balance interval ms */
713 unsigned int busy_factor; /* less balancing by factor if busy */
714 unsigned int imbalance_pct; /* No balance until over watermark */
715 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
716 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
717 unsigned int busy_idx;
718 unsigned int idle_idx;
719 unsigned int newidle_idx;
720 unsigned int wake_idx;
721 unsigned int forkexec_idx;
722 int flags; /* See SD_* */
724 /* Runtime fields. */
725 unsigned long last_balance; /* init to jiffies. units in jiffies */
726 unsigned int balance_interval; /* initialise to 1. units in ms. */
727 unsigned int nr_balance_failed; /* initialise to 0 */
729 #ifdef CONFIG_SCHEDSTATS
730 /* load_balance() stats */
731 unsigned long lb_cnt[CPU_MAX_IDLE_TYPES];
732 unsigned long lb_failed[CPU_MAX_IDLE_TYPES];
733 unsigned long lb_balanced[CPU_MAX_IDLE_TYPES];
734 unsigned long lb_imbalance[CPU_MAX_IDLE_TYPES];
735 unsigned long lb_gained[CPU_MAX_IDLE_TYPES];
736 unsigned long lb_hot_gained[CPU_MAX_IDLE_TYPES];
737 unsigned long lb_nobusyg[CPU_MAX_IDLE_TYPES];
738 unsigned long lb_nobusyq[CPU_MAX_IDLE_TYPES];
740 /* Active load balancing */
741 unsigned long alb_cnt;
742 unsigned long alb_failed;
743 unsigned long alb_pushed;
745 /* SD_BALANCE_EXEC stats */
746 unsigned long sbe_cnt;
747 unsigned long sbe_balanced;
748 unsigned long sbe_pushed;
750 /* SD_BALANCE_FORK stats */
751 unsigned long sbf_cnt;
752 unsigned long sbf_balanced;
753 unsigned long sbf_pushed;
755 /* try_to_wake_up() stats */
756 unsigned long ttwu_wake_remote;
757 unsigned long ttwu_move_affine;
758 unsigned long ttwu_move_balance;
762 extern int partition_sched_domains(cpumask_t *partition1,
763 cpumask_t *partition2);
765 #endif /* CONFIG_SMP */
768 struct io_context; /* See blkdev.h */
771 #define NGROUPS_SMALL 32
772 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
776 gid_t small_block[NGROUPS_SMALL];
782 * get_group_info() must be called with the owning task locked (via task_lock())
783 * when task != current. The reason being that the vast majority of callers are
784 * looking at current->group_info, which can not be changed except by the
785 * current task. Changing current->group_info requires the task lock, too.
787 #define get_group_info(group_info) do { \
788 atomic_inc(&(group_info)->usage); \
791 #define put_group_info(group_info) do { \
792 if (atomic_dec_and_test(&(group_info)->usage)) \
793 groups_free(group_info); \
796 extern struct group_info *groups_alloc(int gidsetsize);
797 extern void groups_free(struct group_info *group_info);
798 extern int set_current_groups(struct group_info *group_info);
799 extern int groups_search(struct group_info *group_info, gid_t grp);
800 /* access the groups "array" with this macro */
801 #define GROUP_AT(gi, i) \
802 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
804 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
805 extern void prefetch_stack(struct task_struct *t);
807 static inline void prefetch_stack(struct task_struct *t) { }
810 struct audit_context; /* See audit.c */
812 struct pipe_inode_info;
813 struct uts_namespace;
817 SLEEP_NONINTERACTIVE,
827 struct sched_class *next;
829 void (*enqueue_task) (struct rq *rq, struct task_struct *p,
830 int wakeup, u64 now);
831 void (*dequeue_task) (struct rq *rq, struct task_struct *p,
833 void (*yield_task) (struct rq *rq, struct task_struct *p);
835 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
837 struct task_struct * (*pick_next_task) (struct rq *rq, u64 now);
838 void (*put_prev_task) (struct rq *rq, struct task_struct *p, u64 now);
840 int (*load_balance) (struct rq *this_rq, int this_cpu,
842 unsigned long max_nr_move, unsigned long max_load_move,
843 struct sched_domain *sd, enum cpu_idle_type idle,
844 int *all_pinned, unsigned long *total_load_moved);
846 void (*set_curr_task) (struct rq *rq);
847 void (*task_tick) (struct rq *rq, struct task_struct *p);
848 void (*task_new) (struct rq *rq, struct task_struct *p);
852 unsigned long weight, inv_weight;
856 * CFS stats for a schedulable entity (task, task-group etc)
858 * Current field usage histogram:
863 * 4 se->sleep_start_fair
866 * 15 se->wait_runtime
868 struct sched_entity {
870 unsigned long delta_fair_run;
871 unsigned long delta_fair_sleep;
872 unsigned long delta_exec;
874 struct load_weight load; /* for load-balancing */
875 struct rb_node run_node;
882 u64 sleep_start_fair;
890 u64 sum_exec_runtime;
891 s64 sum_wait_runtime;
892 s64 sum_sleep_runtime;
893 unsigned long wait_runtime_overruns;
894 unsigned long wait_runtime_underruns;
895 #ifdef CONFIG_FAIR_GROUP_SCHED
896 struct sched_entity *parent;
897 /* rq on which this entity is (to be) queued: */
898 struct cfs_rq *cfs_rq;
899 /* rq "owned" by this entity/group: */
905 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
908 unsigned int flags; /* per process flags, defined below */
911 int lock_depth; /* BKL lock depth */
914 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
918 int load_weight; /* for niceness load balancing purposes */
919 int prio, static_prio, normal_prio;
920 struct list_head run_list;
921 struct prio_array *array;
922 struct sched_class *sched_class;
923 struct sched_entity se;
925 unsigned short ioprio;
926 #ifdef CONFIG_BLK_DEV_IO_TRACE
927 unsigned int btrace_seq;
929 unsigned long sleep_avg;
930 unsigned long long timestamp, last_ran;
931 unsigned long long sched_time; /* sched_clock time spent running */
932 enum sleep_type sleep_type;
935 cpumask_t cpus_allowed;
936 unsigned int time_slice, first_time_slice;
938 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
939 struct sched_info sched_info;
942 struct list_head tasks;
944 * ptrace_list/ptrace_children forms the list of my children
945 * that were stolen by a ptracer.
947 struct list_head ptrace_children;
948 struct list_head ptrace_list;
950 struct mm_struct *mm, *active_mm;
953 struct linux_binfmt *binfmt;
955 int exit_code, exit_signal;
956 int pdeath_signal; /* The signal sent when the parent dies */
958 unsigned int personality;
963 #ifdef CONFIG_CC_STACKPROTECTOR
964 /* Canary value for the -fstack-protector gcc feature */
965 unsigned long stack_canary;
968 * pointers to (original) parent process, youngest child, younger sibling,
969 * older sibling, respectively. (p->father can be replaced with
972 struct task_struct *real_parent; /* real parent process (when being debugged) */
973 struct task_struct *parent; /* parent process */
975 * children/sibling forms the list of my children plus the
976 * tasks I'm ptracing.
978 struct list_head children; /* list of my children */
979 struct list_head sibling; /* linkage in my parent's children list */
980 struct task_struct *group_leader; /* threadgroup leader */
982 /* PID/PID hash table linkage. */
983 struct pid_link pids[PIDTYPE_MAX];
984 struct list_head thread_group;
986 struct completion *vfork_done; /* for vfork() */
987 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
988 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
990 unsigned int rt_priority;
991 cputime_t utime, stime;
992 unsigned long nvcsw, nivcsw; /* context switch counts */
993 struct timespec start_time;
994 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
995 unsigned long min_flt, maj_flt;
997 cputime_t it_prof_expires, it_virt_expires;
998 unsigned long long it_sched_expires;
999 struct list_head cpu_timers[3];
1001 /* process credentials */
1002 uid_t uid,euid,suid,fsuid;
1003 gid_t gid,egid,sgid,fsgid;
1004 struct group_info *group_info;
1005 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
1006 unsigned keep_capabilities:1;
1007 struct user_struct *user;
1009 struct key *request_key_auth; /* assumed request_key authority */
1010 struct key *thread_keyring; /* keyring private to this thread */
1011 unsigned char jit_keyring; /* default keyring to attach requested keys to */
1014 * fpu_counter contains the number of consecutive context switches
1015 * that the FPU is used. If this is over a threshold, the lazy fpu
1016 * saving becomes unlazy to save the trap. This is an unsigned char
1017 * so that after 256 times the counter wraps and the behavior turns
1018 * lazy again; this to deal with bursty apps that only use FPU for
1021 unsigned char fpu_counter;
1022 int oomkilladj; /* OOM kill score adjustment (bit shift). */
1023 char comm[TASK_COMM_LEN]; /* executable name excluding path
1024 - access with [gs]et_task_comm (which lock
1025 it with task_lock())
1026 - initialized normally by flush_old_exec */
1027 /* file system info */
1028 int link_count, total_link_count;
1029 #ifdef CONFIG_SYSVIPC
1031 struct sysv_sem sysvsem;
1033 /* CPU-specific state of this task */
1034 struct thread_struct thread;
1035 /* filesystem information */
1036 struct fs_struct *fs;
1037 /* open file information */
1038 struct files_struct *files;
1040 struct nsproxy *nsproxy;
1041 /* signal handlers */
1042 struct signal_struct *signal;
1043 struct sighand_struct *sighand;
1045 sigset_t blocked, real_blocked;
1046 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */
1047 struct sigpending pending;
1049 unsigned long sas_ss_sp;
1051 int (*notifier)(void *priv);
1052 void *notifier_data;
1053 sigset_t *notifier_mask;
1056 struct audit_context *audit_context;
1059 /* Thread group tracking */
1062 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1063 spinlock_t alloc_lock;
1065 /* Protection of the PI data structures: */
1068 #ifdef CONFIG_RT_MUTEXES
1069 /* PI waiters blocked on a rt_mutex held by this task */
1070 struct plist_head pi_waiters;
1071 /* Deadlock detection and priority inheritance handling */
1072 struct rt_mutex_waiter *pi_blocked_on;
1075 #ifdef CONFIG_DEBUG_MUTEXES
1076 /* mutex deadlock detection */
1077 struct mutex_waiter *blocked_on;
1079 #ifdef CONFIG_TRACE_IRQFLAGS
1080 unsigned int irq_events;
1081 int hardirqs_enabled;
1082 unsigned long hardirq_enable_ip;
1083 unsigned int hardirq_enable_event;
1084 unsigned long hardirq_disable_ip;
1085 unsigned int hardirq_disable_event;
1086 int softirqs_enabled;
1087 unsigned long softirq_disable_ip;
1088 unsigned int softirq_disable_event;
1089 unsigned long softirq_enable_ip;
1090 unsigned int softirq_enable_event;
1091 int hardirq_context;
1092 int softirq_context;
1094 #ifdef CONFIG_LOCKDEP
1095 # define MAX_LOCK_DEPTH 30UL
1098 struct held_lock held_locks[MAX_LOCK_DEPTH];
1099 unsigned int lockdep_recursion;
1102 /* journalling filesystem info */
1105 /* stacked block device info */
1106 struct bio *bio_list, **bio_tail;
1109 struct reclaim_state *reclaim_state;
1111 struct backing_dev_info *backing_dev_info;
1113 struct io_context *io_context;
1115 unsigned long ptrace_message;
1116 siginfo_t *last_siginfo; /* For ptrace use. */
1118 * current io wait handle: wait queue entry to use for io waits
1119 * If this thread is processing aio, this points at the waitqueue
1120 * inside the currently handled kiocb. It may be NULL (i.e. default
1121 * to a stack based synchronous wait) if its doing sync IO.
1123 wait_queue_t *io_wait;
1124 #ifdef CONFIG_TASK_XACCT
1125 /* i/o counters(bytes read/written, #syscalls */
1126 u64 rchar, wchar, syscr, syscw;
1128 struct task_io_accounting ioac;
1129 #if defined(CONFIG_TASK_XACCT)
1130 u64 acct_rss_mem1; /* accumulated rss usage */
1131 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1132 cputime_t acct_stimexpd;/* stime since last update */
1135 struct mempolicy *mempolicy;
1138 #ifdef CONFIG_CPUSETS
1139 struct cpuset *cpuset;
1140 nodemask_t mems_allowed;
1141 int cpuset_mems_generation;
1142 int cpuset_mem_spread_rotor;
1144 struct robust_list_head __user *robust_list;
1145 #ifdef CONFIG_COMPAT
1146 struct compat_robust_list_head __user *compat_robust_list;
1148 struct list_head pi_state_list;
1149 struct futex_pi_state *pi_state_cache;
1151 atomic_t fs_excl; /* holding fs exclusive resources */
1152 struct rcu_head rcu;
1155 * cache last used pipe for splice
1157 struct pipe_inode_info *splice_pipe;
1158 #ifdef CONFIG_TASK_DELAY_ACCT
1159 struct task_delay_info *delays;
1161 #ifdef CONFIG_FAULT_INJECTION
1166 static inline pid_t process_group(struct task_struct *tsk)
1168 return tsk->signal->pgrp;
1171 static inline pid_t signal_session(struct signal_struct *sig)
1173 return sig->__session;
1176 static inline pid_t process_session(struct task_struct *tsk)
1178 return signal_session(tsk->signal);
1181 static inline void set_signal_session(struct signal_struct *sig, pid_t session)
1183 sig->__session = session;
1186 static inline struct pid *task_pid(struct task_struct *task)
1188 return task->pids[PIDTYPE_PID].pid;
1191 static inline struct pid *task_tgid(struct task_struct *task)
1193 return task->group_leader->pids[PIDTYPE_PID].pid;
1196 static inline struct pid *task_pgrp(struct task_struct *task)
1198 return task->group_leader->pids[PIDTYPE_PGID].pid;
1201 static inline struct pid *task_session(struct task_struct *task)
1203 return task->group_leader->pids[PIDTYPE_SID].pid;
1207 * pid_alive - check that a task structure is not stale
1208 * @p: Task structure to be checked.
1210 * Test if a process is not yet dead (at most zombie state)
1211 * If pid_alive fails, then pointers within the task structure
1212 * can be stale and must not be dereferenced.
1214 static inline int pid_alive(struct task_struct *p)
1216 return p->pids[PIDTYPE_PID].pid != NULL;
1220 * is_init - check if a task structure is init
1221 * @tsk: Task structure to be checked.
1223 * Check if a task structure is the first user space task the kernel created.
1225 static inline int is_init(struct task_struct *tsk)
1227 return tsk->pid == 1;
1230 extern struct pid *cad_pid;
1232 extern void free_task(struct task_struct *tsk);
1233 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1235 extern void __put_task_struct(struct task_struct *t);
1237 static inline void put_task_struct(struct task_struct *t)
1239 if (atomic_dec_and_test(&t->usage))
1240 __put_task_struct(t);
1246 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1247 /* Not implemented yet, only for 486*/
1248 #define PF_STARTING 0x00000002 /* being created */
1249 #define PF_EXITING 0x00000004 /* getting shut down */
1250 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1251 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1252 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1253 #define PF_DUMPCORE 0x00000200 /* dumped core */
1254 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1255 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1256 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1257 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1258 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1259 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1260 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1261 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1262 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1263 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1264 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1265 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1266 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1267 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1268 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1269 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1270 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1271 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1274 * Only the _current_ task can read/write to tsk->flags, but other
1275 * tasks can access tsk->flags in readonly mode for example
1276 * with tsk_used_math (like during threaded core dumping).
1277 * There is however an exception to this rule during ptrace
1278 * or during fork: the ptracer task is allowed to write to the
1279 * child->flags of its traced child (same goes for fork, the parent
1280 * can write to the child->flags), because we're guaranteed the
1281 * child is not running and in turn not changing child->flags
1282 * at the same time the parent does it.
1284 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1285 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1286 #define clear_used_math() clear_stopped_child_used_math(current)
1287 #define set_used_math() set_stopped_child_used_math(current)
1288 #define conditional_stopped_child_used_math(condition, child) \
1289 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1290 #define conditional_used_math(condition) \
1291 conditional_stopped_child_used_math(condition, current)
1292 #define copy_to_stopped_child_used_math(child) \
1293 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1294 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1295 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1296 #define used_math() tsk_used_math(current)
1299 extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask);
1301 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1303 if (!cpu_isset(0, new_mask))
1309 extern unsigned long long sched_clock(void);
1310 extern unsigned long long
1311 current_sched_time(const struct task_struct *current_task);
1313 /* sched_exec is called by processes performing an exec */
1315 extern void sched_exec(void);
1317 #define sched_exec() {}
1320 #ifdef CONFIG_HOTPLUG_CPU
1321 extern void idle_task_exit(void);
1323 static inline void idle_task_exit(void) {}
1326 extern void sched_idle_next(void);
1328 extern unsigned int sysctl_sched_granularity;
1329 extern unsigned int sysctl_sched_wakeup_granularity;
1330 extern unsigned int sysctl_sched_batch_wakeup_granularity;
1331 extern unsigned int sysctl_sched_stat_granularity;
1332 extern unsigned int sysctl_sched_runtime_limit;
1333 extern unsigned int sysctl_sched_child_runs_first;
1334 extern unsigned int sysctl_sched_features;
1336 #ifdef CONFIG_RT_MUTEXES
1337 extern int rt_mutex_getprio(struct task_struct *p);
1338 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1339 extern void rt_mutex_adjust_pi(struct task_struct *p);
1341 static inline int rt_mutex_getprio(struct task_struct *p)
1343 return p->normal_prio;
1345 # define rt_mutex_adjust_pi(p) do { } while (0)
1348 extern void set_user_nice(struct task_struct *p, long nice);
1349 extern int task_prio(const struct task_struct *p);
1350 extern int task_nice(const struct task_struct *p);
1351 extern int can_nice(const struct task_struct *p, const int nice);
1352 extern int task_curr(const struct task_struct *p);
1353 extern int idle_cpu(int cpu);
1354 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1355 extern struct task_struct *idle_task(int cpu);
1356 extern struct task_struct *curr_task(int cpu);
1357 extern void set_curr_task(int cpu, struct task_struct *p);
1362 * The default (Linux) execution domain.
1364 extern struct exec_domain default_exec_domain;
1366 union thread_union {
1367 struct thread_info thread_info;
1368 unsigned long stack[THREAD_SIZE/sizeof(long)];
1371 #ifndef __HAVE_ARCH_KSTACK_END
1372 static inline int kstack_end(void *addr)
1374 /* Reliable end of stack detection:
1375 * Some APM bios versions misalign the stack
1377 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1381 extern union thread_union init_thread_union;
1382 extern struct task_struct init_task;
1384 extern struct mm_struct init_mm;
1386 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1387 extern struct task_struct *find_task_by_pid_type(int type, int pid);
1388 extern void __set_special_pids(pid_t session, pid_t pgrp);
1390 /* per-UID process charging. */
1391 extern struct user_struct * alloc_uid(uid_t);
1392 static inline struct user_struct *get_uid(struct user_struct *u)
1394 atomic_inc(&u->__count);
1397 extern void free_uid(struct user_struct *);
1398 extern void switch_uid(struct user_struct *);
1400 #include <asm/current.h>
1402 extern void do_timer(unsigned long ticks);
1404 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
1405 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
1406 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
1407 unsigned long clone_flags));
1409 extern void kick_process(struct task_struct *tsk);
1411 static inline void kick_process(struct task_struct *tsk) { }
1413 extern void FASTCALL(sched_fork(struct task_struct * p, int clone_flags));
1414 extern void FASTCALL(sched_exit(struct task_struct * p));
1416 extern int in_group_p(gid_t);
1417 extern int in_egroup_p(gid_t);
1419 extern void proc_caches_init(void);
1420 extern void flush_signals(struct task_struct *);
1421 extern void ignore_signals(struct task_struct *);
1422 extern void flush_signal_handlers(struct task_struct *, int force_default);
1423 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1425 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1427 unsigned long flags;
1430 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1431 ret = dequeue_signal(tsk, mask, info);
1432 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1437 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1439 extern void unblock_all_signals(void);
1440 extern void release_task(struct task_struct * p);
1441 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1442 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
1443 extern int force_sigsegv(int, struct task_struct *);
1444 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1445 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1446 extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1447 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1448 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1449 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1450 extern int kill_pid(struct pid *pid, int sig, int priv);
1451 extern int kill_proc_info(int, struct siginfo *, pid_t);
1452 extern void do_notify_parent(struct task_struct *, int);
1453 extern void force_sig(int, struct task_struct *);
1454 extern void force_sig_specific(int, struct task_struct *);
1455 extern int send_sig(int, struct task_struct *, int);
1456 extern void zap_other_threads(struct task_struct *p);
1457 extern int kill_proc(pid_t, int, int);
1458 extern struct sigqueue *sigqueue_alloc(void);
1459 extern void sigqueue_free(struct sigqueue *);
1460 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
1461 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
1462 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1463 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1465 static inline int kill_cad_pid(int sig, int priv)
1467 return kill_pid(cad_pid, sig, priv);
1470 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1471 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1472 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1473 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1475 static inline int is_si_special(const struct siginfo *info)
1477 return info <= SEND_SIG_FORCED;
1480 /* True if we are on the alternate signal stack. */
1482 static inline int on_sig_stack(unsigned long sp)
1484 return (sp - current->sas_ss_sp < current->sas_ss_size);
1487 static inline int sas_ss_flags(unsigned long sp)
1489 return (current->sas_ss_size == 0 ? SS_DISABLE
1490 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1494 * Routines for handling mm_structs
1496 extern struct mm_struct * mm_alloc(void);
1498 /* mmdrop drops the mm and the page tables */
1499 extern void FASTCALL(__mmdrop(struct mm_struct *));
1500 static inline void mmdrop(struct mm_struct * mm)
1502 if (atomic_dec_and_test(&mm->mm_count))
1506 /* mmput gets rid of the mappings and all user-space */
1507 extern void mmput(struct mm_struct *);
1508 /* Grab a reference to a task's mm, if it is not already going away */
1509 extern struct mm_struct *get_task_mm(struct task_struct *task);
1510 /* Remove the current tasks stale references to the old mm_struct */
1511 extern void mm_release(struct task_struct *, struct mm_struct *);
1513 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1514 extern void flush_thread(void);
1515 extern void exit_thread(void);
1517 extern void exit_files(struct task_struct *);
1518 extern void __cleanup_signal(struct signal_struct *);
1519 extern void __cleanup_sighand(struct sighand_struct *);
1520 extern void exit_itimers(struct signal_struct *);
1522 extern NORET_TYPE void do_group_exit(int);
1524 extern void daemonize(const char *, ...);
1525 extern int allow_signal(int);
1526 extern int disallow_signal(int);
1528 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1529 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1530 struct task_struct *fork_idle(int);
1532 extern void set_task_comm(struct task_struct *tsk, char *from);
1533 extern void get_task_comm(char *to, struct task_struct *tsk);
1536 extern void wait_task_inactive(struct task_struct * p);
1538 #define wait_task_inactive(p) do { } while (0)
1541 #define remove_parent(p) list_del_init(&(p)->sibling)
1542 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1544 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1546 #define for_each_process(p) \
1547 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1550 * Careful: do_each_thread/while_each_thread is a double loop so
1551 * 'break' will not work as expected - use goto instead.
1553 #define do_each_thread(g, t) \
1554 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1556 #define while_each_thread(g, t) \
1557 while ((t = next_thread(t)) != g)
1559 /* de_thread depends on thread_group_leader not being a pid based check */
1560 #define thread_group_leader(p) (p == p->group_leader)
1562 /* Do to the insanities of de_thread it is possible for a process
1563 * to have the pid of the thread group leader without actually being
1564 * the thread group leader. For iteration through the pids in proc
1565 * all we care about is that we have a task with the appropriate
1566 * pid, we don't actually care if we have the right task.
1568 static inline int has_group_leader_pid(struct task_struct *p)
1570 return p->pid == p->tgid;
1573 static inline struct task_struct *next_thread(const struct task_struct *p)
1575 return list_entry(rcu_dereference(p->thread_group.next),
1576 struct task_struct, thread_group);
1579 static inline int thread_group_empty(struct task_struct *p)
1581 return list_empty(&p->thread_group);
1584 #define delay_group_leader(p) \
1585 (thread_group_leader(p) && !thread_group_empty(p))
1588 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1589 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1590 * pins the final release of task.io_context. Also protects ->cpuset.
1592 * Nests both inside and outside of read_lock(&tasklist_lock).
1593 * It must not be nested with write_lock_irq(&tasklist_lock),
1594 * neither inside nor outside.
1596 static inline void task_lock(struct task_struct *p)
1598 spin_lock(&p->alloc_lock);
1601 static inline void task_unlock(struct task_struct *p)
1603 spin_unlock(&p->alloc_lock);
1606 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1607 unsigned long *flags);
1609 static inline void unlock_task_sighand(struct task_struct *tsk,
1610 unsigned long *flags)
1612 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1615 #ifndef __HAVE_THREAD_FUNCTIONS
1617 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
1618 #define task_stack_page(task) ((task)->stack)
1620 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1622 *task_thread_info(p) = *task_thread_info(org);
1623 task_thread_info(p)->task = p;
1626 static inline unsigned long *end_of_stack(struct task_struct *p)
1628 return (unsigned long *)(task_thread_info(p) + 1);
1633 /* set thread flags in other task's structures
1634 * - see asm/thread_info.h for TIF_xxxx flags available
1636 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1638 set_ti_thread_flag(task_thread_info(tsk), flag);
1641 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1643 clear_ti_thread_flag(task_thread_info(tsk), flag);
1646 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1648 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1651 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1653 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1656 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1658 return test_ti_thread_flag(task_thread_info(tsk), flag);
1661 static inline void set_tsk_need_resched(struct task_struct *tsk)
1663 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1666 static inline void clear_tsk_need_resched(struct task_struct *tsk)
1668 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1671 static inline int signal_pending(struct task_struct *p)
1673 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1676 static inline int need_resched(void)
1678 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1682 * cond_resched() and cond_resched_lock(): latency reduction via
1683 * explicit rescheduling in places that are safe. The return
1684 * value indicates whether a reschedule was done in fact.
1685 * cond_resched_lock() will drop the spinlock before scheduling,
1686 * cond_resched_softirq() will enable bhs before scheduling.
1688 extern int cond_resched(void);
1689 extern int cond_resched_lock(spinlock_t * lock);
1690 extern int cond_resched_softirq(void);
1693 * Does a critical section need to be broken due to another
1696 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1697 # define need_lockbreak(lock) ((lock)->break_lock)
1699 # define need_lockbreak(lock) 0
1703 * Does a critical section need to be broken due to another
1704 * task waiting or preemption being signalled:
1706 static inline int lock_need_resched(spinlock_t *lock)
1708 if (need_lockbreak(lock) || need_resched())
1714 * Reevaluate whether the task has signals pending delivery.
1715 * Wake the task if so.
1716 * This is required every time the blocked sigset_t changes.
1717 * callers must hold sighand->siglock.
1719 extern void recalc_sigpending_and_wake(struct task_struct *t);
1720 extern void recalc_sigpending(void);
1722 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1725 * Wrappers for p->thread_info->cpu access. No-op on UP.
1729 static inline unsigned int task_cpu(const struct task_struct *p)
1731 return task_thread_info(p)->cpu;
1734 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
1738 static inline unsigned int task_cpu(const struct task_struct *p)
1743 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1747 #endif /* CONFIG_SMP */
1749 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1750 extern void arch_pick_mmap_layout(struct mm_struct *mm);
1752 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1754 mm->mmap_base = TASK_UNMAPPED_BASE;
1755 mm->get_unmapped_area = arch_get_unmapped_area;
1756 mm->unmap_area = arch_unmap_area;
1760 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1761 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1763 extern int sched_mc_power_savings, sched_smt_power_savings;
1765 extern void normalize_rt_tasks(void);
1767 #ifdef CONFIG_TASK_XACCT
1768 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
1773 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
1778 static inline void inc_syscr(struct task_struct *tsk)
1783 static inline void inc_syscw(struct task_struct *tsk)
1788 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
1792 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
1796 static inline void inc_syscr(struct task_struct *tsk)
1800 static inline void inc_syscw(struct task_struct *tsk)
1805 #endif /* __KERNEL__ */