projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
timer: implement lockdep deadlock detection
[deliverable/linux.git] / include / linux / sched.h
CommitLineData
1da177e4
LT		 1#ifndef _LINUX_SCHED_H
2#define _LINUX_SCHED_H
3
b7b3c76a
DW		 4/*
5 * cloning flags:
6 */
7#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
8#define CLONE_VM 0x00000100 /* set if VM shared between processes */
9#define CLONE_FS 0x00000200 /* set if fs info shared between processes */
10#define CLONE_FILES 0x00000400 /* set if open files shared between processes */
11#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
12#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
13#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
14#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
15#define CLONE_THREAD 0x00010000 /* Same thread group? */
16#define CLONE_NEWNS 0x00020000 /* New namespace group? */
17#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
18#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
19#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
20#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
21#define CLONE_DETACHED 0x00400000 /* Unused, ignored */
22#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
23#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
24#define CLONE_STOPPED 0x02000000 /* Start in stopped state */
071df104 25#define CLONE_NEWUTS 0x04000000 /* New utsname group? */
25b21cb2 26#define CLONE_NEWIPC 0x08000000 /* New ipcs */
77ec739d 27#define CLONE_NEWUSER 0x10000000 /* New user namespace */
30e49c26 28#define CLONE_NEWPID 0x20000000 /* New pid namespace */
169e3674 29#define CLONE_NEWNET 0x40000000 /* New network namespace */
fadad878 30#define CLONE_IO 0x80000000 /* Clone io context */
b7b3c76a
DW		 31
32/*
33 * Scheduling policies
34 */
35#define SCHED_NORMAL 0
36#define SCHED_FIFO 1
37#define SCHED_RR 2
38#define SCHED_BATCH 3
0e6aca43
IM		 39/* SCHED_ISO: reserved but not implemented yet */
40#define SCHED_IDLE 5
b7b3c76a 41
a3b6714e 42#ifdef __KERNEL__
b7b3c76a
DW		 43
44struct sched_param {
45 int sched_priority;
46};
47
1da177e4
LT		 48#include <asm/param.h> /* for HZ */
49
1da177e4
LT		 50#include <linux/capability.h>
51#include <linux/threads.h>
52#include <linux/kernel.h>
53#include <linux/types.h>
54#include <linux/timex.h>
55#include <linux/jiffies.h>
56#include <linux/rbtree.h>
57#include <linux/thread_info.h>
58#include <linux/cpumask.h>
59#include <linux/errno.h>
60#include <linux/nodemask.h>
c92ff1bd 61#include <linux/mm_types.h>
1da177e4
LT		 62
63#include <asm/system.h>
1da177e4
LT		 64#include <asm/page.h>
65#include <asm/ptrace.h>
1da177e4
LT		 66#include <asm/cputime.h>
67
68#include <linux/smp.h>
69#include <linux/sem.h>
70#include <linux/signal.h>
1da177e4
LT		 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>
3e26c149 77#include <linux/proportions.h>
1da177e4 78#include <linux/seccomp.h>
e56d0903 79#include <linux/rcupdate.h>
23f78d4a 80#include <linux/rtmutex.h>
1da177e4 81
a3b6714e
DW		 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>
7c3ab738 87#include <linux/task_io_accounting.h>
5cb350ba 88#include <linux/kobject.h>
9745512c 89#include <linux/latencytop.h>
9e2b2dc4 90#include <linux/cred.h>
a3b6714e
DW		 91
92#include <asm/processor.h>
36d57ac4 93
78fb7466 94struct mem_cgroup;
1da177e4 95struct exec_domain;
c87e2837 96struct futex_pi_state;
286100a6 97struct robust_list_head;
d89d8796 98struct bio;
ca0002a1 99struct bts_tracer;
1da177e4 100
1da177e4
LT		 101/*
102 * List of flags we want to share for kernel threads,
103 * if only because they are not used by them anyway.
104 */
105#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
106
107/*
108 * These are the constant used to fake the fixed-point load-average
109 * counting. Some notes:
110 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
111 * a load-average precision of 10 bits integer + 11 bits fractional
112 * - if you want to count load-averages more often, you need more
113 * precision, or rounding will get you. With 2-second counting freq,
114 * the EXP_n values would be 1981, 2034 and 2043 if still using only
115 * 11 bit fractions.
116 */
117extern unsigned long avenrun[]; /* Load averages */
118
119#define FSHIFT 11 /* nr of bits of precision */
120#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
0c2043ab 121#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
1da177e4
LT		 122#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
123#define EXP_5 2014 /* 1/exp(5sec/5min) */
124#define EXP_15 2037 /* 1/exp(5sec/15min) */
125
126#define CALC_LOAD(load,exp,n) \
127 load *= exp; \
128 load += n*(FIXED_1-exp); \
129 load >>= FSHIFT;
130
131extern unsigned long total_forks;
132extern int nr_threads;
1da177e4
LT		 133DECLARE_PER_CPU(unsigned long, process_counts);
134extern int nr_processes(void);
135extern unsigned long nr_running(void);
136extern unsigned long nr_uninterruptible(void);
db1b1fef 137extern unsigned long nr_active(void);
1da177e4
LT		 138extern unsigned long nr_iowait(void);
139
43ae34cb
IM		 140struct seq_file;
141struct cfs_rq;
4cf86d77 142struct task_group;
43ae34cb
IM		 143#ifdef CONFIG_SCHED_DEBUG
144extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
145extern void proc_sched_set_task(struct task_struct *p);
146extern void
5cef9eca 147print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
43ae34cb
IM		 148#else
149static inline void
150proc_sched_show_task(struct task_struct *p, struct seq_file *m)
151{
152}
153static inline void proc_sched_set_task(struct task_struct *p)
154{
155}
156static inline void
5cef9eca 157print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
43ae34cb
IM		 158{
159}
160#endif
1da177e4 161
690229a0
IM		 162extern unsigned long long time_sync_thresh;
163
4a8342d2
LT		 164/*
165 * Task state bitmask. NOTE! These bits are also
166 * encoded in fs/proc/array.c: get_task_state().
167 *
168 * We have two separate sets of flags: task->state
169 * is about runnability, while task->exit_state are
170 * about the task exiting. Confusing, but this way
171 * modifying one set can't modify the other one by
172 * mistake.
173 */
1da177e4
LT		 174#define TASK_RUNNING 0
175#define TASK_INTERRUPTIBLE 1
176#define TASK_UNINTERRUPTIBLE 2
f021a3c2
MW		 177#define __TASK_STOPPED 4
178#define __TASK_TRACED 8
4a8342d2
LT		 179/* in tsk->exit_state */
180#define EXIT_ZOMBIE 16
181#define EXIT_DEAD 32
182/* in tsk->state again */
af927232 183#define TASK_DEAD 64
f021a3c2
MW		 184#define TASK_WAKEKILL 128
185
186/* Convenience macros for the sake of set_task_state */
187#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
188#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
189#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
1da177e4 190
92a1f4bc
MW		 191/* Convenience macros for the sake of wake_up */
192#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
f021a3c2 193#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
92a1f4bc
MW		 194
195/* get_task_state() */
196#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
f021a3c2
MW		 197 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
198 __TASK_TRACED)
92a1f4bc 199
f021a3c2
MW		 200#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
201#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
92a1f4bc 202#define task_is_stopped_or_traced(task) \
f021a3c2 203 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
92a1f4bc
MW		 204#define task_contributes_to_load(task) \
205 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
1da177e4
LT		 206
207#define __set_task_state(tsk, state_value) \
208 do { (tsk)->state = (state_value); } while (0)
209#define set_task_state(tsk, state_value) \
210 set_mb((tsk)->state, (state_value))
211
498d0c57
AM		 212/*
213 * set_current_state() includes a barrier so that the write of current->state
214 * is correctly serialised wrt the caller's subsequent test of whether to
215 * actually sleep:
216 *
217 * set_current_state(TASK_UNINTERRUPTIBLE);
218 * if (do_i_need_to_sleep())
219 * schedule();
220 *
221 * If the caller does not need such serialisation then use __set_current_state()
222 */
1da177e4
LT		 223#define __set_current_state(state_value) \
224 do { current->state = (state_value); } while (0)
225#define set_current_state(state_value) \
226 set_mb(current->state, (state_value))
227
228/* Task command name length */
229#define TASK_COMM_LEN 16
230
1da177e4
LT		 231#include <linux/spinlock.h>
232
233/*
234 * This serializes "schedule()" and also protects
235 * the run-queue from deletions/modifications (but
236 * _adding_ to the beginning of the run-queue has
237 * a separate lock).
238 */
239extern rwlock_t tasklist_lock;
240extern spinlock_t mmlist_lock;
241
36c8b586 242struct task_struct;
1da177e4
LT		 243
244extern void sched_init(void);
245extern void sched_init_smp(void);
2d07b255 246extern asmlinkage void schedule_tail(struct task_struct *prev);
36c8b586 247extern void init_idle(struct task_struct *idle, int cpu);
1df21055 248extern void init_idle_bootup_task(struct task_struct *idle);
1da177e4 249
017730c1 250extern int runqueue_is_locked(void);
ad474cac 251extern void task_rq_unlock_wait(struct task_struct *p);
017730c1 252
6a7b3dc3 253extern cpumask_var_t nohz_cpu_mask;
46cb4b7c
SS		 254#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
255extern int select_nohz_load_balancer(int cpu);
256#else
257static inline int select_nohz_load_balancer(int cpu)
258{
259 return 0;
260}
261#endif
1da177e4 262
e59e2ae2 263/*
39bc89fd 264 * Only dump TASK_* tasks. (0 for all tasks)
e59e2ae2
IM		 265 */
266extern void show_state_filter(unsigned long state_filter);
267
268static inline void show_state(void)
269{
39bc89fd 270 show_state_filter(0);
e59e2ae2
IM		 271}
272
1da177e4
LT		 273extern void show_regs(struct pt_regs *);
274
275/*
276 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
277 * task), SP is the stack pointer of the first frame that should be shown in the back
278 * trace (or NULL if the entire call-chain of the task should be shown).
279 */
280extern void show_stack(struct task_struct *task, unsigned long *sp);
281
282void io_schedule(void);
283long io_schedule_timeout(long timeout);
284
285extern void cpu_init (void);
286extern void trap_init(void);
287extern void update_process_times(int user);
288extern void scheduler_tick(void);
289
82a1fcb9
IM		 290extern void sched_show_task(struct task_struct *p);
291
8446f1d3 292#ifdef CONFIG_DETECT_SOFTLOCKUP
6687a97d 293extern void softlockup_tick(void);
8446f1d3 294extern void touch_softlockup_watchdog(void);
04c9167f 295extern void touch_all_softlockup_watchdogs(void);
baf48f65
MSB		 296extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
297 struct file *filp, void __user *buffer,
298 size_t *lenp, loff_t *ppos);
9c44bc03 299extern unsigned int softlockup_panic;
82a1fcb9
IM		 300extern unsigned long sysctl_hung_task_check_count;
301extern unsigned long sysctl_hung_task_timeout_secs;
90739081 302extern unsigned long sysctl_hung_task_warnings;
9383d967 303extern int softlockup_thresh;
8446f1d3 304#else
6687a97d 305static inline void softlockup_tick(void)
8446f1d3
IM		 306{
307}
308static inline void spawn_softlockup_task(void)
309{
310}
311static inline void touch_softlockup_watchdog(void)
312{
313}
04c9167f
JF		 314static inline void touch_all_softlockup_watchdogs(void)
315{
316}
8446f1d3
IM		 317#endif
318
319
1da177e4
LT		 320/* Attach to any functions which should be ignored in wchan output. */
321#define __sched __attribute__((__section__(".sched.text")))
deaf2227
IM		 322
323/* Linker adds these: start and end of __sched functions */
324extern char __sched_text_start[], __sched_text_end[];
325
1da177e4
LT		 326/* Is this address in the __sched functions? */
327extern int in_sched_functions(unsigned long addr);
328
329#define MAX_SCHEDULE_TIMEOUT LONG_MAX
b3c97528 330extern signed long schedule_timeout(signed long timeout);
64ed93a2 331extern signed long schedule_timeout_interruptible(signed long timeout);
294d5cc2 332extern signed long schedule_timeout_killable(signed long timeout);
64ed93a2 333extern signed long schedule_timeout_uninterruptible(signed long timeout);
41719b03 334asmlinkage void __schedule(void);
1da177e4 335asmlinkage void schedule(void);
0d66bf6d 336extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner);
1da177e4 337
ab516013 338struct nsproxy;
acce292c 339struct user_namespace;
1da177e4
LT		 340
341/* Maximum number of active map areas.. This is a random (large) number */
342#define DEFAULT_MAX_MAP_COUNT 65536
343
344extern int sysctl_max_map_count;
345
346#include <linux/aio.h>
347
348extern unsigned long
349arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
350 unsigned long, unsigned long);
351extern unsigned long
352arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
353 unsigned long len, unsigned long pgoff,
354 unsigned long flags);
1363c3cd
WW		 355extern void arch_unmap_area(struct mm_struct *, unsigned long);
356extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
1da177e4 357
f7d0b926 358#if USE_SPLIT_PTLOCKS
f412ac08
HD		 359/*
360 * The mm counters are not protected by its page_table_lock,
361 * so must be incremented atomically.
362 */
d3cb4871
CL		 363#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
364#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
365#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
366#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
367#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
f412ac08 368
f7d0b926 369#else /* !USE_SPLIT_PTLOCKS */
f412ac08
HD		 370/*
371 * The mm counters are protected by its page_table_lock,
372 * so can be incremented directly.
373 */
1da177e4
LT		 374#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
375#define get_mm_counter(mm, member) ((mm)->_##member)
376#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
377#define inc_mm_counter(mm, member) (mm)->_##member++
378#define dec_mm_counter(mm, member) (mm)->_##member--
f412ac08 379
f7d0b926 380#endif /* !USE_SPLIT_PTLOCKS */
4294621f 381
f412ac08
HD		 382#define get_mm_rss(mm) \
383 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
365e9c87
HD		 384#define update_hiwater_rss(mm) do { \
385 unsigned long _rss = get_mm_rss(mm); \
386 if ((mm)->hiwater_rss < _rss) \
387 (mm)->hiwater_rss = _rss; \
388} while (0)
389#define update_hiwater_vm(mm) do { \
390 if ((mm)->hiwater_vm < (mm)->total_vm) \
391 (mm)->hiwater_vm = (mm)->total_vm; \
392} while (0)
393
901608d9
ON		 394#define get_mm_hiwater_rss(mm) max((mm)->hiwater_rss, get_mm_rss(mm))
395#define get_mm_hiwater_vm(mm) max((mm)->hiwater_vm, (mm)->total_vm)
396
6c5d5238
KH		 397extern void set_dumpable(struct mm_struct *mm, int value);
398extern int get_dumpable(struct mm_struct *mm);
399
400/* mm flags */
3cb4a0bb 401/* dumpable bits */
6c5d5238
KH		 402#define MMF_DUMPABLE 0 /* core dump is permitted */
403#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
3cb4a0bb
KH		 404#define MMF_DUMPABLE_BITS 2
405
406/* coredump filter bits */
407#define MMF_DUMP_ANON_PRIVATE 2
408#define MMF_DUMP_ANON_SHARED 3
409#define MMF_DUMP_MAPPED_PRIVATE 4
410#define MMF_DUMP_MAPPED_SHARED 5
82df3973 411#define MMF_DUMP_ELF_HEADERS 6
e575f111
KM		 412#define MMF_DUMP_HUGETLB_PRIVATE 7
413#define MMF_DUMP_HUGETLB_SHARED 8
3cb4a0bb 414#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
e575f111 415#define MMF_DUMP_FILTER_BITS 7
3cb4a0bb
KH		 416#define MMF_DUMP_FILTER_MASK \
417 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
418#define MMF_DUMP_FILTER_DEFAULT \
e575f111 419 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
656eb2cd
RM		 420 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
421
422#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
423# define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
424#else
425# define MMF_DUMP_MASK_DEFAULT_ELF 0
426#endif
6c5d5238 427
1da177e4
LT		 428struct sighand_struct {
429 atomic_t count;
430 struct k_sigaction action[_NSIG];
431 spinlock_t siglock;
b8fceee1 432 wait_queue_head_t signalfd_wqh;
1da177e4
LT		 433};
434
0e464814 435struct pacct_struct {
f6ec29a4
KK		 436 int ac_flag;
437 long ac_exitcode;
0e464814 438 unsigned long ac_mem;
77787bfb
KK		 439 cputime_t ac_utime, ac_stime;
440 unsigned long ac_minflt, ac_majflt;
0e464814
KK		 441};
442
f06febc9
FM		 443/**
444 * struct task_cputime - collected CPU time counts
445 * @utime: time spent in user mode, in &cputime_t units
446 * @stime: time spent in kernel mode, in &cputime_t units
447 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
35626129 448 * @lock: lock for fields in this struct
5ce73a4a 449 *
f06febc9
FM		 450 * This structure groups together three kinds of CPU time that are
451 * tracked for threads and thread groups. Most things considering
452 * CPU time want to group these counts together and treat all three
453 * of them in parallel.
454 */
455struct task_cputime {
456 cputime_t utime;
457 cputime_t stime;
458 unsigned long long sum_exec_runtime;
490dea45 459 spinlock_t lock;
f06febc9
FM		 460};
461/* Alternate field names when used to cache expirations. */
462#define prof_exp stime
463#define virt_exp utime
464#define sched_exp sum_exec_runtime
465
466/**
467 * struct thread_group_cputime - thread group interval timer counts
468 * @totals: thread group interval timers; substructure for
469 * uniprocessor kernel, per-cpu for SMP kernel.
470 *
471 * This structure contains the version of task_cputime, above, that is
472 * used for thread group CPU clock calculations.
473 */
f06febc9 474struct thread_group_cputime {
490dea45 475 struct task_cputime totals;
f06febc9 476};
f06febc9 477
1da177e4
LT		 478/*
479 * NOTE! "signal_struct" does not have it's own
480 * locking, because a shared signal_struct always
481 * implies a shared sighand_struct, so locking
482 * sighand_struct is always a proper superset of
483 * the locking of signal_struct.
484 */
485struct signal_struct {
486 atomic_t count;
487 atomic_t live;
488
489 wait_queue_head_t wait_chldexit; /* for wait4() */
490
491 /* current thread group signal load-balancing target: */
36c8b586 492 struct task_struct *curr_target;
1da177e4
LT		 493
494 /* shared signal handling: */
495 struct sigpending shared_pending;
496
497 /* thread group exit support */
498 int group_exit_code;
499 /* overloaded:
500 * - notify group_exit_task when ->count is equal to notify_count
501 * - everyone except group_exit_task is stopped during signal delivery
502 * of fatal signals, group_exit_task processes the signal.
503 */
1da177e4 504 int notify_count;
07dd20e0 505 struct task_struct *group_exit_task;
1da177e4
LT		 506
507 /* thread group stop support, overloads group_exit_code too */
508 int group_stop_count;
509 unsigned int flags; /* see SIGNAL_* flags below */
510
511 /* POSIX.1b Interval Timers */
512 struct list_head posix_timers;
513
514 /* ITIMER_REAL timer for the process */
2ff678b8 515 struct hrtimer real_timer;
fea9d175 516 struct pid *leader_pid;
2ff678b8 517 ktime_t it_real_incr;
1da177e4
LT		 518
519 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
520 cputime_t it_prof_expires, it_virt_expires;
521 cputime_t it_prof_incr, it_virt_incr;
522
f06febc9
FM		 523 /*
524 * Thread group totals for process CPU clocks.
525 * See thread_group_cputime(), et al, for details.
526 */
527 struct thread_group_cputime cputime;
528
529 /* Earliest-expiration cache. */
530 struct task_cputime cputime_expires;
531
532 struct list_head cpu_timers[3];
533
1da177e4 534 /* job control IDs */
9a2e7057
PE		 535
536 /*
537 * pgrp and session fields are deprecated.
538 * use the task_session_Xnr and task_pgrp_Xnr routines below
539 */
540
541 union {
542 pid_t pgrp __deprecated;
543 pid_t __pgrp;
544 };
545
ab521dc0 546 struct pid *tty_old_pgrp;
1ec320af
CLG		 547
548 union {
549 pid_t session __deprecated;
550 pid_t __session;
551 };
552
1da177e4
LT		 553 /* boolean value for session group leader */
554 int leader;
555
556 struct tty_struct *tty; /* NULL if no tty */
557
558 /*
559 * Cumulative resource counters for dead threads in the group,
560 * and for reaped dead child processes forked by this group.
561 * Live threads maintain their own counters and add to these
562 * in __exit_signal, except for the group leader.
563 */
f06febc9 564 cputime_t cutime, cstime;
9ac52315
LV		 565 cputime_t gtime;
566 cputime_t cgtime;
1da177e4
LT		 567 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
568 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
6eaeeaba 569 unsigned long inblock, oublock, cinblock, coublock;
940389b8 570 struct task_io_accounting ioac;
1da177e4 571
1da177e4
LT		 572 /*
573 * We don't bother to synchronize most readers of this at all,
574 * because there is no reader checking a limit that actually needs
575 * to get both rlim_cur and rlim_max atomically, and either one
576 * alone is a single word that can safely be read normally.
577 * getrlimit/setrlimit use task_lock(current->group_leader) to
578 * protect this instead of the siglock, because they really
579 * have no need to disable irqs.
580 */
581 struct rlimit rlim[RLIM_NLIMITS];
582
0e464814
KK		 583#ifdef CONFIG_BSD_PROCESS_ACCT
584 struct pacct_struct pacct; /* per-process accounting information */
585#endif
ad4ecbcb 586#ifdef CONFIG_TASKSTATS
ad4ecbcb
SN		 587 struct taskstats *stats;
588#endif
522ed776
MT		 589#ifdef CONFIG_AUDIT
590 unsigned audit_tty;
591 struct tty_audit_buf *tty_audit_buf;
592#endif
1da177e4
LT		 593};
594
4866cde0
NP		 595/* Context switch must be unlocked if interrupts are to be enabled */
596#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
597# define __ARCH_WANT_UNLOCKED_CTXSW
598#endif
599
1da177e4
LT		 600/*
601 * Bits in flags field of signal_struct.
602 */
603#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
604#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
605#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
606#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
e4420551
ON		 607/*
608 * Pending notifications to parent.
609 */
610#define SIGNAL_CLD_STOPPED 0x00000010
611#define SIGNAL_CLD_CONTINUED 0x00000020
612#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
1da177e4 613
fae5fa44
ON		 614#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
615
ed5d2cac
ON		 616/* If true, all threads except ->group_exit_task have pending SIGKILL */
617static inline int signal_group_exit(const struct signal_struct *sig)
618{
619 return (sig->flags & SIGNAL_GROUP_EXIT) ||
620 (sig->group_exit_task != NULL);
621}
622
1da177e4
LT		 623/*
624 * Some day this will be a full-fledged user tracking system..
625 */
626struct user_struct {
627 atomic_t __count; /* reference count */
628 atomic_t processes; /* How many processes does this user have? */
629 atomic_t files; /* How many open files does this user have? */
630 atomic_t sigpending; /* How many pending signals does this user have? */
2d9048e2 631#ifdef CONFIG_INOTIFY_USER
0eeca283
RL		 632 atomic_t inotify_watches; /* How many inotify watches does this user have? */
633 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
634#endif
7ef9964e 635#ifdef CONFIG_EPOLL
7ef9964e
DL		 636 atomic_t epoll_watches; /* The number of file descriptors currently watched */
637#endif
970a8645 638#ifdef CONFIG_POSIX_MQUEUE
1da177e4
LT		 639 /* protected by mq_lock */
640 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
970a8645 641#endif
1da177e4
LT		 642 unsigned long locked_shm; /* How many pages of mlocked shm ? */
643
644#ifdef CONFIG_KEYS
645 struct key *uid_keyring; /* UID specific keyring */
646 struct key *session_keyring; /* UID's default session keyring */
647#endif
648
649 /* Hash table maintenance information */
735de223 650 struct hlist_node uidhash_node;
1da177e4 651 uid_t uid;
18b6e041 652 struct user_namespace *user_ns;
24e377a8 653
052f1dc7 654#ifdef CONFIG_USER_SCHED
4cf86d77 655 struct task_group *tg;
b1a8c172 656#ifdef CONFIG_SYSFS
eb41d946 657 struct kobject kobj;
5cb350ba 658 struct work_struct work;
24e377a8 659#endif
b1a8c172 660#endif
1da177e4
LT		 661};
662
eb41d946 663extern int uids_sysfs_init(void);
5cb350ba 664
1da177e4
LT		 665extern struct user_struct *find_user(uid_t);
666
667extern struct user_struct root_user;
668#define INIT_USER (&root_user)
669
b6dff3ec 670
1da177e4
LT		 671struct backing_dev_info;
672struct reclaim_state;
673
52f17b6c 674#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1da177e4
LT		 675struct sched_info {
676 /* cumulative counters */
2d72376b 677 unsigned long pcount; /* # of times run on this cpu */
9c2c4802 678 unsigned long long run_delay; /* time spent waiting on a runqueue */
1da177e4
LT		 679
680 /* timestamps */
172ba844
BS		 681 unsigned long long last_arrival,/* when we last ran on a cpu */
682 last_queued; /* when we were last queued to run */
b8efb561
IM		 683#ifdef CONFIG_SCHEDSTATS
684 /* BKL stats */
480b9434 685 unsigned int bkl_count;
b8efb561 686#endif
1da177e4 687};
52f17b6c 688#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
1da177e4 689
ca74e92b
SN		 690#ifdef CONFIG_TASK_DELAY_ACCT
691struct task_delay_info {
692 spinlock_t lock;
693 unsigned int flags; /* Private per-task flags */
694
695 /* For each stat XXX, add following, aligned appropriately
696 *
697 * struct timespec XXX_start, XXX_end;
698 * u64 XXX_delay;
699 * u32 XXX_count;
700 *
701 * Atomicity of updates to XXX_delay, XXX_count protected by
702 * single lock above (split into XXX_lock if contention is an issue).
703 */
0ff92245
SN		 704
705 /*
706 * XXX_count is incremented on every XXX operation, the delay
707 * associated with the operation is added to XXX_delay.
708 * XXX_delay contains the accumulated delay time in nanoseconds.
709 */
710 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
711 u64 blkio_delay; /* wait for sync block io completion */
712 u64 swapin_delay; /* wait for swapin block io completion */
713 u32 blkio_count; /* total count of the number of sync block */
714 /* io operations performed */
715 u32 swapin_count; /* total count of the number of swapin block */
716 /* io operations performed */
873b4771
KK		 717
718 struct timespec freepages_start, freepages_end;
719 u64 freepages_delay; /* wait for memory reclaim */
720 u32 freepages_count; /* total count of memory reclaim */
ca74e92b 721};
52f17b6c
CS		 722#endif /* CONFIG_TASK_DELAY_ACCT */
723
724static inline int sched_info_on(void)
725{
726#ifdef CONFIG_SCHEDSTATS
727 return 1;
728#elif defined(CONFIG_TASK_DELAY_ACCT)
729 extern int delayacct_on;
730 return delayacct_on;
731#else
732 return 0;
ca74e92b 733#endif
52f17b6c 734}
ca74e92b 735
d15bcfdb
IM		 736enum cpu_idle_type {
737 CPU_IDLE,
738 CPU_NOT_IDLE,
739 CPU_NEWLY_IDLE,
740 CPU_MAX_IDLE_TYPES
1da177e4
LT		 741};
742
743/*
744 * sched-domains (multiprocessor balancing) declarations:
745 */
9aa7b369
IM		 746
747/*
748 * Increase resolution of nice-level calculations:
749 */
750#define SCHED_LOAD_SHIFT 10
751#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
752
f8700df7 753#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
1da177e4 754
2dd73a4f 755#ifdef CONFIG_SMP
1da177e4
LT		 756#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
757#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
758#define SD_BALANCE_EXEC 4 /* Balance on exec */
147cbb4b
NP		 759#define SD_BALANCE_FORK 8 /* Balance on fork, clone */
760#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
761#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
762#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
763#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
5c45bf27 764#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
89c4710e 765#define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
08c183f3 766#define SD_SERIALIZE 1024 /* Only a single load balancing instance */
1d3504fc 767#define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
5c45bf27 768
afb8a9b7
GS		 769enum powersavings_balance_level {
770 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */
771 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package
772 * first for long running threads
773 */
774 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle
775 * cpu package for power savings
776 */
777 MAX_POWERSAVINGS_BALANCE_LEVELS
778};
89c4710e 779
716707b2 780extern int sched_mc_power_savings, sched_smt_power_savings;
89c4710e 781
716707b2
VS		 782static inline int sd_balance_for_mc_power(void)
783{
784 if (sched_smt_power_savings)
785 return SD_POWERSAVINGS_BALANCE;
5c45bf27 786
716707b2
VS		 787 return 0;
788}
89c4710e 789
716707b2
VS		 790static inline int sd_balance_for_package_power(void)
791{
792 if (sched_mc_power_savings | sched_smt_power_savings)
793 return SD_POWERSAVINGS_BALANCE;
794
795 return 0;
796}
5c45bf27 797
100fdaee
VS		 798/*
799 * Optimise SD flags for power savings:
800 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
801 * Keep default SD flags if sched_{smt,mc}_power_saving=0
802 */
803
804static inline int sd_power_saving_flags(void)
805{
806 if (sched_mc_power_savings | sched_smt_power_savings)
807 return SD_BALANCE_NEWIDLE;
808
809 return 0;
810}
1da177e4
LT		 811
812struct sched_group {
813 struct sched_group *next; /* Must be a circular list */
1da177e4
LT		 814
815 /*
816 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
817 * single CPU. This is read only (except for setup, hotplug CPU).
5517d86b 818 * Note : Never change cpu_power without recompute its reciprocal
1da177e4 819 */
5517d86b
ED		 820 unsigned int __cpu_power;
821 /*
822 * reciprocal value of cpu_power to avoid expensive divides
823 * (see include/linux/reciprocal_div.h)
824 */
825 u32 reciprocal_cpu_power;
6c99e9ad
RR		 826
827 unsigned long cpumask[];
1da177e4
LT		 828};
829
758b2cdc
RR		 830static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
831{
6c99e9ad 832 return to_cpumask(sg->cpumask);
758b2cdc
RR		 833}
834
1d3504fc
HS		 835enum sched_domain_level {
836 SD_LV_NONE = 0,
837 SD_LV_SIBLING,
838 SD_LV_MC,
839 SD_LV_CPU,
840 SD_LV_NODE,
841 SD_LV_ALLNODES,
842 SD_LV_MAX
843};
844
845struct sched_domain_attr {
846 int relax_domain_level;
847};
848
849#define SD_ATTR_INIT (struct sched_domain_attr) { \
850 .relax_domain_level = -1, \
851}
852
1da177e4
LT		 853struct sched_domain {
854 /* These fields must be setup */
855 struct sched_domain *parent; /* top domain must be null terminated */
1a848870 856 struct sched_domain *child; /* bottom domain must be null terminated */
1da177e4 857 struct sched_group *groups; /* the balancing groups of the domain */
1da177e4
LT		 858 unsigned long min_interval; /* Minimum balance interval ms */
859 unsigned long max_interval; /* Maximum balance interval ms */
860 unsigned int busy_factor; /* less balancing by factor if busy */
861 unsigned int imbalance_pct; /* No balance until over watermark */
1da177e4 862 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
7897986b
NP		 863 unsigned int busy_idx;
864 unsigned int idle_idx;
865 unsigned int newidle_idx;
866 unsigned int wake_idx;
147cbb4b 867 unsigned int forkexec_idx;
1da177e4 868 int flags; /* See SD_* */
1d3504fc 869 enum sched_domain_level level;
1da177e4
LT		 870
871 /* Runtime fields. */
872 unsigned long last_balance; /* init to jiffies. units in jiffies */
873 unsigned int balance_interval; /* initialise to 1. units in ms. */
874 unsigned int nr_balance_failed; /* initialise to 0 */
875
2398f2c6
PZ		 876 u64 last_update;
877
1da177e4
LT		 878#ifdef CONFIG_SCHEDSTATS
879 /* load_balance() stats */
480b9434
KC		 880 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
881 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
882 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
883 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
884 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
885 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
886 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
887 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
1da177e4
LT		 888
889 /* Active load balancing */
480b9434
KC		 890 unsigned int alb_count;
891 unsigned int alb_failed;
892 unsigned int alb_pushed;
1da177e4 893
68767a0a 894 /* SD_BALANCE_EXEC stats */
480b9434
KC		 895 unsigned int sbe_count;
896 unsigned int sbe_balanced;
897 unsigned int sbe_pushed;
1da177e4 898
68767a0a 899 /* SD_BALANCE_FORK stats */
480b9434
KC		 900 unsigned int sbf_count;
901 unsigned int sbf_balanced;
902 unsigned int sbf_pushed;
68767a0a 903
1da177e4 904 /* try_to_wake_up() stats */
480b9434
KC		 905 unsigned int ttwu_wake_remote;
906 unsigned int ttwu_move_affine;
907 unsigned int ttwu_move_balance;
1da177e4 908#endif
a5d8c348
IM		 909#ifdef CONFIG_SCHED_DEBUG
910 char *name;
911#endif
6c99e9ad
RR		 912
913 /* span of all CPUs in this domain */
914 unsigned long span[];
1da177e4
LT		 915};
916
758b2cdc
RR		 917static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
918{
6c99e9ad 919 return to_cpumask(sd->span);
758b2cdc
RR		 920}
921
96f874e2 922extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
1d3504fc 923 struct sched_domain_attr *dattr_new);
029190c5 924
06aaf76a
IM		 925/* Test a flag in parent sched domain */
926static inline int test_sd_parent(struct sched_domain *sd, int flag)
927{
928 if (sd->parent && (sd->parent->flags & flag))
929 return 1;
930
931 return 0;
932}
933
1b427c15
IM		 934#else /* CONFIG_SMP */
935
936struct sched_domain_attr;
937
938static inline void
96f874e2 939partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
1b427c15
IM		 940 struct sched_domain_attr *dattr_new)
941{
942}
943#endif /* !CONFIG_SMP */
1da177e4 944
1da177e4 945struct io_context; /* See blkdev.h */
1da177e4 946
1da177e4 947
383f2835 948#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
36c8b586 949extern void prefetch_stack(struct task_struct *t);
383f2835
CK		 950#else
951static inline void prefetch_stack(struct task_struct *t) { }
952#endif
1da177e4
LT		 953
954struct audit_context; /* See audit.c */
955struct mempolicy;
b92ce558 956struct pipe_inode_info;
4865ecf1 957struct uts_namespace;
1da177e4 958
20b8a59f
IM		 959struct rq;
960struct sched_domain;
961
962struct sched_class {
5522d5d5 963 const struct sched_class *next;
20b8a59f 964
fd390f6a 965 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
f02231e5 966 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
4530d7ab 967 void (*yield_task) (struct rq *rq);
20b8a59f 968
15afe09b 969 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
20b8a59f 970
fb8d4724 971 struct task_struct * (*pick_next_task) (struct rq *rq);
31ee529c 972 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
20b8a59f 973
681f3e68 974#ifdef CONFIG_SMP
4ce72a2c
LZ		 975 int (*select_task_rq)(struct task_struct *p, int sync);
976
43010659 977 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
e1d1484f 978 struct rq *busiest, unsigned long max_load_move,
20b8a59f 979 struct sched_domain *sd, enum cpu_idle_type idle,
a4ac01c3 980 int *all_pinned, int *this_best_prio);
20b8a59f 981
e1d1484f
PW		 982 int (*move_one_task) (struct rq *this_rq, int this_cpu,
983 struct rq *busiest, struct sched_domain *sd,
984 enum cpu_idle_type idle);
9a897c5a
SR		 985 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
986 void (*post_schedule) (struct rq *this_rq);
987 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
e1d1484f 988
cd8ba7cd 989 void (*set_cpus_allowed)(struct task_struct *p,
96f874e2 990 const struct cpumask *newmask);
57d885fe 991
1f11eb6a
GH		 992 void (*rq_online)(struct rq *rq);
993 void (*rq_offline)(struct rq *rq);
4ce72a2c
LZ		 994#endif
995
996 void (*set_curr_task) (struct rq *rq);
997 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
998 void (*task_new) (struct rq *rq, struct task_struct *p);
cb469845
SR		 999
1000 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
1001 int running);
1002 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
1003 int running);
1004 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1005 int oldprio, int running);
810b3817
PZ		 1006
1007#ifdef CONFIG_FAIR_GROUP_SCHED
1008 void (*moved_group) (struct task_struct *p);
1009#endif
20b8a59f
IM		 1010};
1011
1012struct load_weight {
1013 unsigned long weight, inv_weight;
1014};
1015
1016/*
1017 * CFS stats for a schedulable entity (task, task-group etc)
1018 *
1019 * Current field usage histogram:
1020 *
1021 * 4 se->block_start
1022 * 4 se->run_node
1023 * 4 se->sleep_start
20b8a59f 1024 * 6 se->load.weight
20b8a59f
IM		 1025 */
1026struct sched_entity {
20b8a59f
IM		 1027 struct load_weight load; /* for load-balancing */
1028 struct rb_node run_node;
4a55bd5e 1029 struct list_head group_node;
20b8a59f
IM		 1030 unsigned int on_rq;
1031
94c18227
IM		 1032 u64 exec_start;
1033 u64 sum_exec_runtime;
e9acbff6 1034 u64 vruntime;
f6cf891c 1035 u64 prev_sum_exec_runtime;
94c18227 1036
4ae7d5ce
IM		 1037 u64 last_wakeup;
1038 u64 avg_overlap;
1039
94c18227 1040#ifdef CONFIG_SCHEDSTATS
20b8a59f 1041 u64 wait_start;
94c18227 1042 u64 wait_max;
6d082592
AV		 1043 u64 wait_count;
1044 u64 wait_sum;
94c18227 1045
20b8a59f 1046 u64 sleep_start;
20b8a59f 1047 u64 sleep_max;
94c18227
IM		 1048 s64 sum_sleep_runtime;
1049
1050 u64 block_start;
20b8a59f
IM		 1051 u64 block_max;
1052 u64 exec_max;
eba1ed4b 1053 u64 slice_max;
cc367732
IM		 1054
1055 u64 nr_migrations;
1056 u64 nr_migrations_cold;
1057 u64 nr_failed_migrations_affine;
1058 u64 nr_failed_migrations_running;
1059 u64 nr_failed_migrations_hot;
1060 u64 nr_forced_migrations;
1061 u64 nr_forced2_migrations;
1062
1063 u64 nr_wakeups;
1064 u64 nr_wakeups_sync;
1065 u64 nr_wakeups_migrate;
1066 u64 nr_wakeups_local;
1067 u64 nr_wakeups_remote;
1068 u64 nr_wakeups_affine;
1069 u64 nr_wakeups_affine_attempts;
1070 u64 nr_wakeups_passive;
1071 u64 nr_wakeups_idle;
94c18227
IM		 1072#endif
1073
20b8a59f
IM		 1074#ifdef CONFIG_FAIR_GROUP_SCHED
1075 struct sched_entity *parent;
1076 /* rq on which this entity is (to be) queued: */
1077 struct cfs_rq *cfs_rq;
1078 /* rq "owned" by this entity/group: */
1079 struct cfs_rq *my_q;
1080#endif
1081};
70b97a7f 1082
fa717060
PZ		 1083struct sched_rt_entity {
1084 struct list_head run_list;
78f2c7db 1085 unsigned long timeout;
bee367ed 1086 unsigned int time_slice;
6f505b16
PZ		 1087 int nr_cpus_allowed;
1088
58d6c2d7 1089 struct sched_rt_entity *back;
052f1dc7 1090#ifdef CONFIG_RT_GROUP_SCHED
6f505b16
PZ		 1091 struct sched_rt_entity *parent;
1092 /* rq on which this entity is (to be) queued: */
1093 struct rt_rq *rt_rq;
1094 /* rq "owned" by this entity/group: */
1095 struct rt_rq *my_q;
1096#endif
fa717060
PZ		 1097};
1098
1da177e4
LT		 1099struct task_struct {
1100 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
f7e4217b 1101 void *stack;
1da177e4 1102 atomic_t usage;
97dc32cd
WC		 1103 unsigned int flags; /* per process flags, defined below */
1104 unsigned int ptrace;
1da177e4 1105
36772092 1106 int lock_depth; /* BKL lock depth */
1da177e4 1107
2dd73a4f
PW		 1108#ifdef CONFIG_SMP
1109#ifdef __ARCH_WANT_UNLOCKED_CTXSW
4866cde0
NP		 1110 int oncpu;
1111#endif
2dd73a4f 1112#endif
50e645a8 1113
b29739f9 1114 int prio, static_prio, normal_prio;
c7aceaba 1115 unsigned int rt_priority;
5522d5d5 1116 const struct sched_class *sched_class;
20b8a59f 1117 struct sched_entity se;
fa717060 1118 struct sched_rt_entity rt;
1da177e4 1119
e107be36
AK		 1120#ifdef CONFIG_PREEMPT_NOTIFIERS
1121 /* list of struct preempt_notifier: */
1122 struct hlist_head preempt_notifiers;
1123#endif
1124
18796aa0
AD		 1125 /*
1126 * fpu_counter contains the number of consecutive context switches
1127 * that the FPU is used. If this is over a threshold, the lazy fpu
1128 * saving becomes unlazy to save the trap. This is an unsigned char
1129 * so that after 256 times the counter wraps and the behavior turns
1130 * lazy again; this to deal with bursty apps that only use FPU for
1131 * a short time
1132 */
1133 unsigned char fpu_counter;
1134 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
6c5c9341 1135#ifdef CONFIG_BLK_DEV_IO_TRACE
2056a782 1136 unsigned int btrace_seq;
6c5c9341 1137#endif
1da177e4 1138
97dc32cd 1139 unsigned int policy;
1da177e4 1140 cpumask_t cpus_allowed;
1da177e4 1141
e260be67
PM		 1142#ifdef CONFIG_PREEMPT_RCU
1143 int rcu_read_lock_nesting;
1144 int rcu_flipctr_idx;
1145#endif /* #ifdef CONFIG_PREEMPT_RCU */
1146
52f17b6c 1147#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1da177e4
LT		 1148 struct sched_info sched_info;
1149#endif
1150
1151 struct list_head tasks;
1da177e4
LT		 1152
1153 struct mm_struct *mm, *active_mm;
1154
1155/* task state */
1156 struct linux_binfmt *binfmt;
97dc32cd 1157 int exit_state;
1da177e4
LT		 1158 int exit_code, exit_signal;
1159 int pdeath_signal; /* The signal sent when the parent dies */
1160 /* ??? */
97dc32cd 1161 unsigned int personality;
1da177e4
LT		 1162 unsigned did_exec:1;
1163 pid_t pid;
1164 pid_t tgid;
0a425405
AV		 1165
1166#ifdef CONFIG_CC_STACKPROTECTOR
1167 /* Canary value for the -fstack-protector gcc feature */
1168 unsigned long stack_canary;
1169#endif
1da177e4
LT		 1170 /*
1171 * pointers to (original) parent process, youngest child, younger sibling,
1172 * older sibling, respectively. (p->father can be replaced with
f470021a 1173 * p->real_parent->pid)
1da177e4 1174 */
f470021a
RM		 1175 struct task_struct *real_parent; /* real parent process */
1176 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1da177e4 1177 /*
f470021a 1178 * children/sibling forms the list of my natural children
1da177e4
LT		 1179 */
1180 struct list_head children; /* list of my children */
1181 struct list_head sibling; /* linkage in my parent's children list */
1182 struct task_struct *group_leader; /* threadgroup leader */
1183
f470021a
RM		 1184 /*
1185 * ptraced is the list of tasks this task is using ptrace on.
1186 * This includes both natural children and PTRACE_ATTACH targets.
1187 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1188 */
1189 struct list_head ptraced;
1190 struct list_head ptrace_entry;
1191
ca0002a1
MM		 1192#ifdef CONFIG_X86_PTRACE_BTS
1193 /*
1194 * This is the tracer handle for the ptrace BTS extension.
1195 * This field actually belongs to the ptracer task.
1196 */
1197 struct bts_tracer *bts;
6abb11ae
MM		 1198 /*
1199 * The buffer to hold the BTS data.
1200 */
1201 void *bts_buffer;
c2724775 1202 size_t bts_size;
ca0002a1
MM		 1203#endif /* CONFIG_X86_PTRACE_BTS */
1204
1da177e4 1205 /* PID/PID hash table linkage. */
92476d7f 1206 struct pid_link pids[PIDTYPE_MAX];
47e65328 1207 struct list_head thread_group;
1da177e4
LT		 1208
1209 struct completion *vfork_done; /* for vfork() */
1210 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1211 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1212
c66f08be 1213 cputime_t utime, stime, utimescaled, stimescaled;
9ac52315 1214 cputime_t gtime;
9301899b 1215 cputime_t prev_utime, prev_stime;
1da177e4 1216 unsigned long nvcsw, nivcsw; /* context switch counts */
924b42d5
TJ		 1217 struct timespec start_time; /* monotonic time */
1218 struct timespec real_start_time; /* boot based time */
1da177e4
LT		 1219/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1220 unsigned long min_flt, maj_flt;
1221
f06febc9 1222 struct task_cputime cputime_expires;
1da177e4
LT		 1223 struct list_head cpu_timers[3];
1224
1225/* process credentials */
3b11a1de
DH		 1226 const struct cred *real_cred; /* objective and real subjective task
1227 * credentials (COW) */
1228 const struct cred *cred; /* effective (overridable) subjective task
1229 * credentials (COW) */
d84f4f99 1230 struct mutex cred_exec_mutex; /* execve vs ptrace cred calculation mutex */
b6dff3ec 1231
36772092
PBG		 1232 char comm[TASK_COMM_LEN]; /* executable name excluding path
1233 - access with [gs]et_task_comm (which lock
1234 it with task_lock())
1235 - initialized normally by flush_old_exec */
1da177e4
LT		 1236/* file system info */
1237 int link_count, total_link_count;
3d5b6fcc 1238#ifdef CONFIG_SYSVIPC
1da177e4
LT		 1239/* ipc stuff */
1240 struct sysv_sem sysvsem;
3d5b6fcc 1241#endif
82a1fcb9
IM		 1242#ifdef CONFIG_DETECT_SOFTLOCKUP
1243/* hung task detection */
1244 unsigned long last_switch_timestamp;
1245 unsigned long last_switch_count;
1246#endif
1da177e4
LT		 1247/* CPU-specific state of this task */
1248 struct thread_struct thread;
1249/* filesystem information */
1250 struct fs_struct *fs;
1251/* open file information */
1252 struct files_struct *files;
1651e14e 1253/* namespaces */
ab516013 1254 struct nsproxy *nsproxy;
1da177e4
LT		 1255/* signal handlers */
1256 struct signal_struct *signal;
1257 struct sighand_struct *sighand;
1258
1259 sigset_t blocked, real_blocked;
f3de272b 1260 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1da177e4
LT		 1261 struct sigpending pending;
1262
1263 unsigned long sas_ss_sp;
1264 size_t sas_ss_size;
1265 int (*notifier)(void *priv);
1266 void *notifier_data;
1267 sigset_t *notifier_mask;
1da177e4 1268 struct audit_context *audit_context;
bfef93a5
AV		 1269#ifdef CONFIG_AUDITSYSCALL
1270 uid_t loginuid;
4746ec5b 1271 unsigned int sessionid;
bfef93a5 1272#endif
1da177e4
LT		 1273 seccomp_t seccomp;
1274
1275/* Thread group tracking */
1276 u32 parent_exec_id;
1277 u32 self_exec_id;
1278/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1279 spinlock_t alloc_lock;
1da177e4 1280
b29739f9
IM		 1281 /* Protection of the PI data structures: */
1282 spinlock_t pi_lock;
1283
23f78d4a
IM		 1284#ifdef CONFIG_RT_MUTEXES
1285 /* PI waiters blocked on a rt_mutex held by this task */
1286 struct plist_head pi_waiters;
1287 /* Deadlock detection and priority inheritance handling */
1288 struct rt_mutex_waiter *pi_blocked_on;
23f78d4a
IM		 1289#endif
1290
408894ee
IM		 1291#ifdef CONFIG_DEBUG_MUTEXES
1292 /* mutex deadlock detection */
1293 struct mutex_waiter *blocked_on;
1294#endif
de30a2b3
IM		 1295#ifdef CONFIG_TRACE_IRQFLAGS
1296 unsigned int irq_events;
1297 int hardirqs_enabled;
1298 unsigned long hardirq_enable_ip;
1299 unsigned int hardirq_enable_event;
1300 unsigned long hardirq_disable_ip;
1301 unsigned int hardirq_disable_event;
1302 int softirqs_enabled;
1303 unsigned long softirq_disable_ip;
1304 unsigned int softirq_disable_event;
1305 unsigned long softirq_enable_ip;
1306 unsigned int softirq_enable_event;
1307 int hardirq_context;
1308 int softirq_context;
1309#endif
fbb9ce95 1310#ifdef CONFIG_LOCKDEP
bdb9441e 1311# define MAX_LOCK_DEPTH 48UL
fbb9ce95
IM		 1312 u64 curr_chain_key;
1313 int lockdep_depth;
fbb9ce95 1314 unsigned int lockdep_recursion;
c7aceaba 1315 struct held_lock held_locks[MAX_LOCK_DEPTH];
fbb9ce95 1316#endif
408894ee 1317
1da177e4
LT		 1318/* journalling filesystem info */
1319 void *journal_info;
1320
d89d8796
NB		 1321/* stacked block device info */
1322 struct bio *bio_list, **bio_tail;
1323
1da177e4
LT		 1324/* VM state */
1325 struct reclaim_state *reclaim_state;
1326
1da177e4
LT		 1327 struct backing_dev_info *backing_dev_info;
1328
1329 struct io_context *io_context;
1330
1331 unsigned long ptrace_message;
1332 siginfo_t *last_siginfo; /* For ptrace use. */
940389b8 1333 struct task_io_accounting ioac;
8f0ab514 1334#if defined(CONFIG_TASK_XACCT)
1da177e4
LT		 1335 u64 acct_rss_mem1; /* accumulated rss usage */
1336 u64 acct_vm_mem1; /* accumulated virtual memory usage */
49b5cf34 1337 cputime_t acct_timexpd; /* stime + utime since last update */
1da177e4 1338#endif
1da177e4 1339#ifdef CONFIG_CPUSETS
1da177e4
LT		 1340 nodemask_t mems_allowed;
1341 int cpuset_mems_generation;
825a46af 1342 int cpuset_mem_spread_rotor;
1da177e4 1343#endif
ddbcc7e8 1344#ifdef CONFIG_CGROUPS
817929ec
PM		 1345 /* Control Group info protected by css_set_lock */
1346 struct css_set *cgroups;
1347 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1348 struct list_head cg_list;
ddbcc7e8 1349#endif
42b2dd0a 1350#ifdef CONFIG_FUTEX
0771dfef 1351 struct robust_list_head __user *robust_list;
34f192c6
IM		 1352#ifdef CONFIG_COMPAT
1353 struct compat_robust_list_head __user *compat_robust_list;
1354#endif
c87e2837
IM		 1355 struct list_head pi_state_list;
1356 struct futex_pi_state *pi_state_cache;
c7aceaba
RK		 1357#endif
1358#ifdef CONFIG_NUMA
1359 struct mempolicy *mempolicy;
1360 short il_next;
42b2dd0a 1361#endif
22e2c507 1362 atomic_t fs_excl; /* holding fs exclusive resources */
e56d0903 1363 struct rcu_head rcu;
b92ce558
JA		 1364
1365 /*
1366 * cache last used pipe for splice
1367 */
1368 struct pipe_inode_info *splice_pipe;
ca74e92b
SN		 1369#ifdef CONFIG_TASK_DELAY_ACCT
1370 struct task_delay_info *delays;
f4f154fd
AM		 1371#endif
1372#ifdef CONFIG_FAULT_INJECTION
1373 int make_it_fail;
ca74e92b 1374#endif
3e26c149 1375 struct prop_local_single dirties;
9745512c
AV		 1376#ifdef CONFIG_LATENCYTOP
1377 int latency_record_count;
1378 struct latency_record latency_record[LT_SAVECOUNT];
1379#endif
6976675d
AV		 1380 /*
1381 * time slack values; these are used to round up poll() and
1382 * select() etc timeout values. These are in nanoseconds.
1383 */
1384 unsigned long timer_slack_ns;
1385 unsigned long default_timer_slack_ns;
f8d570a4
DM		 1386
1387 struct list_head *scm_work_list;
fb52607a 1388#ifdef CONFIG_FUNCTION_GRAPH_TRACER
f201ae23
FW		 1389 /* Index of current stored adress in ret_stack */
1390 int curr_ret_stack;
1391 /* Stack of return addresses for return function tracing */
1392 struct ftrace_ret_stack *ret_stack;
1393 /*
1394 * Number of functions that haven't been traced
1395 * because of depth overrun.
1396 */
1397 atomic_t trace_overrun;
380c4b14
FW		 1398 /* Pause for the tracing */
1399 atomic_t tracing_graph_pause;
f201ae23 1400#endif
ea4e2bc4
SR		 1401#ifdef CONFIG_TRACING
1402 /* state flags for use by tracers */
1403 unsigned long trace;
1404#endif
1da177e4
LT		 1405};
1406
e05606d3
IM		 1407/*
1408 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1409 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1410 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1411 * values are inverted: lower p->prio value means higher priority.
1412 *
1413 * The MAX_USER_RT_PRIO value allows the actual maximum
1414 * RT priority to be separate from the value exported to
1415 * user-space. This allows kernel threads to set their
1416 * priority to a value higher than any user task. Note:
1417 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1418 */
1419
1420#define MAX_USER_RT_PRIO 100
1421#define MAX_RT_PRIO MAX_USER_RT_PRIO
1422
1423#define MAX_PRIO (MAX_RT_PRIO + 40)
1424#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1425
1426static inline int rt_prio(int prio)
1427{
1428 if (unlikely(prio < MAX_RT_PRIO))
1429 return 1;
1430 return 0;
1431}
1432
e868171a 1433static inline int rt_task(struct task_struct *p)
e05606d3
IM		 1434{
1435 return rt_prio(p->prio);
1436}
1437
a47afb0f 1438static inline void set_task_session(struct task_struct *tsk, pid_t session)
937949d9 1439{
a47afb0f 1440 tsk->signal->__session = session;
937949d9
CLG		 1441}
1442
9a2e7057
PE		 1443static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1444{
1445 tsk->signal->__pgrp = pgrp;
1446}
1447
e868171a 1448static inline struct pid *task_pid(struct task_struct *task)
22c935f4
EB		 1449{
1450 return task->pids[PIDTYPE_PID].pid;
1451}
1452
e868171a 1453static inline struct pid *task_tgid(struct task_struct *task)
22c935f4
EB		 1454{
1455 return task->group_leader->pids[PIDTYPE_PID].pid;
1456}
1457
e868171a 1458static inline struct pid *task_pgrp(struct task_struct *task)
22c935f4
EB		 1459{
1460 return task->group_leader->pids[PIDTYPE_PGID].pid;
1461}
1462
e868171a 1463static inline struct pid *task_session(struct task_struct *task)
22c935f4
EB		 1464{
1465 return task->group_leader->pids[PIDTYPE_SID].pid;
1466}
1467
7af57294
PE		 1468struct pid_namespace;
1469
1470/*
1471 * the helpers to get the task's different pids as they are seen
1472 * from various namespaces
1473 *
1474 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
44c4e1b2
EB		 1475 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1476 * current.
7af57294
PE		 1477 * task_xid_nr_ns() : id seen from the ns specified;
1478 *
1479 * set_task_vxid() : assigns a virtual id to a task;
1480 *
7af57294
PE		 1481 * see also pid_nr() etc in include/linux/pid.h
1482 */
1483
e868171a 1484static inline pid_t task_pid_nr(struct task_struct *tsk)
7af57294
PE		 1485{
1486 return tsk->pid;
1487}
1488
2f2a3a46 1489pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
7af57294
PE		 1490
1491static inline pid_t task_pid_vnr(struct task_struct *tsk)
1492{
1493 return pid_vnr(task_pid(tsk));
1494}
1495
1496
e868171a 1497static inline pid_t task_tgid_nr(struct task_struct *tsk)
7af57294
PE		 1498{
1499 return tsk->tgid;
1500}
1501
2f2a3a46 1502pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
7af57294
PE		 1503
1504static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1505{
1506 return pid_vnr(task_tgid(tsk));
1507}
1508
1509
e868171a 1510static inline pid_t task_pgrp_nr(struct task_struct *tsk)
7af57294 1511{
9a2e7057 1512 return tsk->signal->__pgrp;
7af57294
PE		 1513}
1514
2f2a3a46 1515pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
7af57294
PE		 1516
1517static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1518{
1519 return pid_vnr(task_pgrp(tsk));
1520}
1521
1522
e868171a 1523static inline pid_t task_session_nr(struct task_struct *tsk)
7af57294
PE		 1524{
1525 return tsk->signal->__session;
1526}
1527
2f2a3a46 1528pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
7af57294
PE		 1529
1530static inline pid_t task_session_vnr(struct task_struct *tsk)
1531{
1532 return pid_vnr(task_session(tsk));
1533}
1534
1535
1da177e4
LT		 1536/**
1537 * pid_alive - check that a task structure is not stale
1538 * @p: Task structure to be checked.
1539 *
1540 * Test if a process is not yet dead (at most zombie state)
1541 * If pid_alive fails, then pointers within the task structure
1542 * can be stale and must not be dereferenced.
1543 */
e868171a 1544static inline int pid_alive(struct task_struct *p)
1da177e4 1545{
92476d7f 1546 return p->pids[PIDTYPE_PID].pid != NULL;
1da177e4
LT		 1547}
1548
f400e198 1549/**
b460cbc5 1550 * is_global_init - check if a task structure is init
3260259f
H		 1551 * @tsk: Task structure to be checked.
1552 *
1553 * Check if a task structure is the first user space task the kernel created.
b460cbc5 1554 */
e868171a 1555static inline int is_global_init(struct task_struct *tsk)
b461cc03
PE		 1556{
1557 return tsk->pid == 1;
1558}
b460cbc5
SH		 1559
1560/*
1561 * is_container_init:
1562 * check whether in the task is init in its own pid namespace.
f400e198 1563 */
b461cc03 1564extern int is_container_init(struct task_struct *tsk);
f400e198 1565
9ec52099
CLG		 1566extern struct pid *cad_pid;
1567
1da177e4 1568extern void free_task(struct task_struct *tsk);
1da177e4 1569#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
e56d0903 1570
158d9ebd 1571extern void __put_task_struct(struct task_struct *t);
e56d0903
IM		 1572
1573static inline void put_task_struct(struct task_struct *t)
1574{
1575 if (atomic_dec_and_test(&t->usage))
8c7904a0 1576 __put_task_struct(t);
e56d0903 1577}
1da177e4 1578
49048622
BS		 1579extern cputime_t task_utime(struct task_struct *p);
1580extern cputime_t task_stime(struct task_struct *p);
1581extern cputime_t task_gtime(struct task_struct *p);
1582
1da177e4
LT		 1583/*
1584 * Per process flags
1585 */
1586#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1587 /* Not implemented yet, only for 486*/
1588#define PF_STARTING 0x00000002 /* being created */
1589#define PF_EXITING 0x00000004 /* getting shut down */
778e9a9c 1590#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
94886b84 1591#define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1da177e4
LT		 1592#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1593#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1594#define PF_DUMPCORE 0x00000200 /* dumped core */
1595#define PF_SIGNALED 0x00000400 /* killed by a signal */
1596#define PF_MEMALLOC 0x00000800 /* Allocating memory */
1597#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1598#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1da177e4
LT		 1599#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1600#define PF_FROZEN 0x00010000 /* frozen for system suspend */
1601#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1602#define PF_KSWAPD 0x00040000 /* I am kswapd */
1603#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1604#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
246bb0b1 1605#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
b31dc66a
JA		 1606#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1607#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1608#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1609#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
9985b0ba 1610#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
c61afb18 1611#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
61a87122 1612#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
ba96a0c8 1613#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
ebb12db5 1614#define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1da177e4
LT		 1615
1616/*
1617 * Only the _current_ task can read/write to tsk->flags, but other
1618 * tasks can access tsk->flags in readonly mode for example
1619 * with tsk_used_math (like during threaded core dumping).
1620 * There is however an exception to this rule during ptrace
1621 * or during fork: the ptracer task is allowed to write to the
1622 * child->flags of its traced child (same goes for fork, the parent
1623 * can write to the child->flags), because we're guaranteed the
1624 * child is not running and in turn not changing child->flags
1625 * at the same time the parent does it.
1626 */
1627#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1628#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1629#define clear_used_math() clear_stopped_child_used_math(current)
1630#define set_used_math() set_stopped_child_used_math(current)
1631#define conditional_stopped_child_used_math(condition, child) \
1632 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1633#define conditional_used_math(condition) \
1634 conditional_stopped_child_used_math(condition, current)
1635#define copy_to_stopped_child_used_math(child) \
1636 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1637/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1638#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1639#define used_math() tsk_used_math(current)
1640
1641#ifdef CONFIG_SMP
cd8ba7cd 1642extern int set_cpus_allowed_ptr(struct task_struct *p,
96f874e2 1643 const struct cpumask *new_mask);
1da177e4 1644#else
cd8ba7cd 1645static inline int set_cpus_allowed_ptr(struct task_struct *p,
96f874e2 1646 const struct cpumask *new_mask)
1da177e4 1647{
96f874e2 1648 if (!cpumask_test_cpu(0, new_mask))
1da177e4
LT		 1649 return -EINVAL;
1650 return 0;
1651}
1652#endif
cd8ba7cd
MT		 1653static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1654{
1655 return set_cpus_allowed_ptr(p, &new_mask);
1656}
1da177e4
LT		 1657
1658extern unsigned long long sched_clock(void);
e436d800 1659
c1955a3d
PZ		 1660extern void sched_clock_init(void);
1661extern u64 sched_clock_cpu(int cpu);
3e51f33f 1662
c1955a3d 1663#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
3e51f33f
PZ		 1664static inline void sched_clock_tick(void)
1665{
1666}
1667
1668static inline void sched_clock_idle_sleep_event(void)
1669{
1670}
1671
1672static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1673{
1674}
e4e4e534 1675#else
3e51f33f
PZ		 1676extern void sched_clock_tick(void);
1677extern void sched_clock_idle_sleep_event(void);
1678extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1679#endif
1680
e436d800
IM		 1681/*
1682 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1683 * clock constructed from sched_clock():
1684 */
1685extern unsigned long long cpu_clock(int cpu);
1686
36c8b586 1687extern unsigned long long
41b86e9c 1688task_sched_runtime(struct task_struct *task);
f06febc9 1689extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1da177e4
LT		 1690
1691/* sched_exec is called by processes performing an exec */
1692#ifdef CONFIG_SMP
1693extern void sched_exec(void);
1694#else
1695#define sched_exec() {}
1696#endif
1697
2aa44d05
IM		 1698extern void sched_clock_idle_sleep_event(void);
1699extern void sched_clock_idle_wakeup_event(u64 delta_ns);
bb29ab26 1700
1da177e4
LT		 1701#ifdef CONFIG_HOTPLUG_CPU
1702extern void idle_task_exit(void);
1703#else
1704static inline void idle_task_exit(void) {}
1705#endif
1706
1707extern void sched_idle_next(void);
b29739f9 1708
06d8308c
TG		 1709#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1710extern void wake_up_idle_cpu(int cpu);
1711#else
1712static inline void wake_up_idle_cpu(int cpu) { }
1713#endif
1714
21805085 1715extern unsigned int sysctl_sched_latency;
b2be5e96 1716extern unsigned int sysctl_sched_min_granularity;
bf0f6f24 1717extern unsigned int sysctl_sched_wakeup_granularity;
47fea2ad
JSR		 1718extern unsigned int sysctl_sched_shares_ratelimit;
1719extern unsigned int sysctl_sched_shares_thresh;
1720#ifdef CONFIG_SCHED_DEBUG
bf0f6f24
IM		 1721extern unsigned int sysctl_sched_child_runs_first;
1722extern unsigned int sysctl_sched_features;
da84d961 1723extern unsigned int sysctl_sched_migration_cost;
b82d9fdd 1724extern unsigned int sysctl_sched_nr_migrate;
b2be5e96
PZ		 1725
1726int sched_nr_latency_handler(struct ctl_table *table, int write,
1727 struct file *file, void __user *buffer, size_t *length,
1728 loff_t *ppos);
2bd8e6d4 1729#endif
9f0c1e56
PZ		 1730extern unsigned int sysctl_sched_rt_period;
1731extern int sysctl_sched_rt_runtime;
2bd8e6d4 1732
d0b27fa7
PZ		 1733int sched_rt_handler(struct ctl_table *table, int write,
1734 struct file *filp, void __user *buffer, size_t *lenp,
1735 loff_t *ppos);
1736
2bd8e6d4 1737extern unsigned int sysctl_sched_compat_yield;
bf0f6f24 1738
b29739f9 1739#ifdef CONFIG_RT_MUTEXES
36c8b586
IM		 1740extern int rt_mutex_getprio(struct task_struct *p);
1741extern void rt_mutex_setprio(struct task_struct *p, int prio);
1742extern void rt_mutex_adjust_pi(struct task_struct *p);
b29739f9 1743#else
e868171a 1744static inline int rt_mutex_getprio(struct task_struct *p)
b29739f9
IM		 1745{
1746 return p->normal_prio;
1747}
95e02ca9 1748# define rt_mutex_adjust_pi(p) do { } while (0)
b29739f9
IM		 1749#endif
1750
36c8b586
IM		 1751extern void set_user_nice(struct task_struct *p, long nice);
1752extern int task_prio(const struct task_struct *p);
1753extern int task_nice(const struct task_struct *p);
1754extern int can_nice(const struct task_struct *p, const int nice);
1755extern int task_curr(const struct task_struct *p);
1da177e4
LT		 1756extern int idle_cpu(int cpu);
1757extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
961ccddd
RR		 1758extern int sched_setscheduler_nocheck(struct task_struct *, int,
1759 struct sched_param *);
36c8b586
IM		 1760extern struct task_struct *idle_task(int cpu);
1761extern struct task_struct *curr_task(int cpu);
1762extern void set_curr_task(int cpu, struct task_struct *p);
1da177e4
LT		 1763
1764void yield(void);
1765
1766/*
1767 * The default (Linux) execution domain.
1768 */
1769extern struct exec_domain default_exec_domain;
1770
1771union thread_union {
1772 struct thread_info thread_info;
1773 unsigned long stack[THREAD_SIZE/sizeof(long)];
1774};
1775
1776#ifndef __HAVE_ARCH_KSTACK_END
1777static inline int kstack_end(void *addr)
1778{
1779 /* Reliable end of stack detection:
1780 * Some APM bios versions misalign the stack
1781 */
1782 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1783}
1784#endif
1785
1786extern union thread_union init_thread_union;
1787extern struct task_struct init_task;
1788
1789extern struct mm_struct init_mm;
1790
198fe21b
PE		 1791extern struct pid_namespace init_pid_ns;
1792
1793/*
1794 * find a task by one of its numerical ids
1795 *
1796 * find_task_by_pid_type_ns():
1797 * it is the most generic call - it finds a task by all id,
1798 * type and namespace specified
1799 * find_task_by_pid_ns():
1800 * finds a task by its pid in the specified namespace
228ebcbe
PE		 1801 * find_task_by_vpid():
1802 * finds a task by its virtual pid
198fe21b 1803 *
e49859e7 1804 * see also find_vpid() etc in include/linux/pid.h
198fe21b
PE		 1805 */
1806
1807extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1808 struct pid_namespace *ns);
1809
228ebcbe
PE		 1810extern struct task_struct *find_task_by_vpid(pid_t nr);
1811extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1812 struct pid_namespace *ns);
198fe21b 1813
8520d7c7 1814extern void __set_special_pids(struct pid *pid);
1da177e4
LT		 1815
1816/* per-UID process charging. */
acce292c 1817extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1da177e4
LT		 1818static inline struct user_struct *get_uid(struct user_struct *u)
1819{
1820 atomic_inc(&u->__count);
1821 return u;
1822}
1823extern void free_uid(struct user_struct *);
28f300d2 1824extern void release_uids(struct user_namespace *ns);
1da177e4
LT		 1825
1826#include <asm/current.h>
1827
3171a030 1828extern void do_timer(unsigned long ticks);
1da177e4 1829
b3c97528
HH		 1830extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1831extern int wake_up_process(struct task_struct *tsk);
1832extern void wake_up_new_task(struct task_struct *tsk,
1833 unsigned long clone_flags);
1da177e4
LT		 1834#ifdef CONFIG_SMP
1835 extern void kick_process(struct task_struct *tsk);
1836#else
1837 static inline void kick_process(struct task_struct *tsk) { }
1838#endif
ad46c2c4
IM		 1839extern void sched_fork(struct task_struct *p, int clone_flags);
1840extern void sched_dead(struct task_struct *p);
1da177e4 1841
1da177e4
LT		 1842extern void proc_caches_init(void);
1843extern void flush_signals(struct task_struct *);
10ab825b 1844extern void ignore_signals(struct task_struct *);
1da177e4
LT		 1845extern void flush_signal_handlers(struct task_struct *, int force_default);
1846extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1847
1848static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1849{
1850 unsigned long flags;
1851 int ret;
1852
1853 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1854 ret = dequeue_signal(tsk, mask, info);
1855 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1856
1857 return ret;
1858}
1859
1860extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1861 sigset_t *mask);
1862extern void unblock_all_signals(void);
1863extern void release_task(struct task_struct * p);
1864extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1da177e4
LT		 1865extern int force_sigsegv(int, struct task_struct *);
1866extern int force_sig_info(int, struct siginfo *, struct task_struct *);
c4b92fc1 1867extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
c4b92fc1 1868extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2425c08b 1869extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
c4b92fc1
EB		 1870extern int kill_pgrp(struct pid *pid, int sig, int priv);
1871extern int kill_pid(struct pid *pid, int sig, int priv);
c3de4b38 1872extern int kill_proc_info(int, struct siginfo *, pid_t);
2b2a1ff6 1873extern int do_notify_parent(struct task_struct *, int);
1da177e4
LT		 1874extern void force_sig(int, struct task_struct *);
1875extern void force_sig_specific(int, struct task_struct *);
1876extern int send_sig(int, struct task_struct *, int);
1877extern void zap_other_threads(struct task_struct *p);
1da177e4
LT		 1878extern struct sigqueue *sigqueue_alloc(void);
1879extern void sigqueue_free(struct sigqueue *);
ac5c2153 1880extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
9ac95f2f 1881extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1da177e4
LT		 1882extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1883
9ec52099
CLG		 1884static inline int kill_cad_pid(int sig, int priv)
1885{
1886 return kill_pid(cad_pid, sig, priv);
1887}
1888
1da177e4
LT		 1889/* These can be the second arg to send_sig_info/send_group_sig_info. */
1890#define SEND_SIG_NOINFO ((struct siginfo *) 0)
1891#define SEND_SIG_PRIV ((struct siginfo *) 1)
1892#define SEND_SIG_FORCED ((struct siginfo *) 2)
1893
621d3121
ON		 1894static inline int is_si_special(const struct siginfo *info)
1895{
1896 return info <= SEND_SIG_FORCED;
1897}
1898
1da177e4
LT		 1899/* True if we are on the alternate signal stack. */
1900
1901static inline int on_sig_stack(unsigned long sp)
1902{
1903 return (sp - current->sas_ss_sp < current->sas_ss_size);
1904}
1905
1906static inline int sas_ss_flags(unsigned long sp)
1907{
1908 return (current->sas_ss_size == 0 ? SS_DISABLE
1909 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1910}
1911
1da177e4
LT		 1912/*
1913 * Routines for handling mm_structs
1914 */
1915extern struct mm_struct * mm_alloc(void);
1916
1917/* mmdrop drops the mm and the page tables */
b3c97528 1918extern void __mmdrop(struct mm_struct *);
1da177e4
LT		 1919static inline void mmdrop(struct mm_struct * mm)
1920{
6fb43d7b 1921 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1da177e4
LT		 1922 __mmdrop(mm);
1923}
1924
1925/* mmput gets rid of the mappings and all user-space */
1926extern void mmput(struct mm_struct *);
1927/* Grab a reference to a task's mm, if it is not already going away */
1928extern struct mm_struct *get_task_mm(struct task_struct *task);
1929/* Remove the current tasks stale references to the old mm_struct */
1930extern void mm_release(struct task_struct *, struct mm_struct *);
402b0862
CO		 1931/* Allocate a new mm structure and copy contents from tsk->mm */
1932extern struct mm_struct *dup_mm(struct task_struct *tsk);
1da177e4
LT		 1933
1934extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1935extern void flush_thread(void);
1936extern void exit_thread(void);
1937
1da177e4 1938extern void exit_files(struct task_struct *);
6b3934ef 1939extern void __cleanup_signal(struct signal_struct *);
a7e5328a 1940extern void __cleanup_sighand(struct sighand_struct *);
cbaffba1 1941
1da177e4 1942extern void exit_itimers(struct signal_struct *);
cbaffba1 1943extern void flush_itimer_signals(void);
1da177e4
LT		 1944
1945extern NORET_TYPE void do_group_exit(int);
1946
1da177e4
LT		 1947extern void daemonize(const char *, ...);
1948extern int allow_signal(int);
1949extern int disallow_signal(int);
1da177e4
LT		 1950
1951extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1952extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
36c8b586 1953struct task_struct *fork_idle(int);
1da177e4
LT		 1954
1955extern void set_task_comm(struct task_struct *tsk, char *from);
59714d65 1956extern char *get_task_comm(char *to, struct task_struct *tsk);
1da177e4
LT		 1957
1958#ifdef CONFIG_SMP
85ba2d86 1959extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
1da177e4 1960#else
85ba2d86
RM		 1961static inline unsigned long wait_task_inactive(struct task_struct *p,
1962 long match_state)
1963{
1964 return 1;
1965}
1da177e4
LT		 1966#endif
1967
5e85d4ab 1968#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1da177e4
LT		 1969
1970#define for_each_process(p) \
1971 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1972
d84f4f99
DH		 1973extern bool is_single_threaded(struct task_struct *);
1974
1da177e4
LT		 1975/*
1976 * Careful: do_each_thread/while_each_thread is a double loop so
1977 * 'break' will not work as expected - use goto instead.
1978 */
1979#define do_each_thread(g, t) \
1980 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1981
1982#define while_each_thread(g, t) \
1983 while ((t = next_thread(t)) != g)
1984
de12a787
EB		 1985/* de_thread depends on thread_group_leader not being a pid based check */
1986#define thread_group_leader(p) (p == p->group_leader)
1da177e4 1987
0804ef4b
EB		 1988/* Do to the insanities of de_thread it is possible for a process
1989 * to have the pid of the thread group leader without actually being
1990 * the thread group leader. For iteration through the pids in proc
1991 * all we care about is that we have a task with the appropriate
1992 * pid, we don't actually care if we have the right task.
1993 */
e868171a 1994static inline int has_group_leader_pid(struct task_struct *p)
0804ef4b
EB		 1995{
1996 return p->pid == p->tgid;
1997}
1998
bac0abd6
PE		 1999static inline
2000int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2001{
2002 return p1->tgid == p2->tgid;
2003}
2004
36c8b586 2005static inline struct task_struct *next_thread(const struct task_struct *p)
47e65328
ON		 2006{
2007 return list_entry(rcu_dereference(p->thread_group.next),
36c8b586 2008 struct task_struct, thread_group);
47e65328
ON		 2009}
2010
e868171a 2011static inline int thread_group_empty(struct task_struct *p)
1da177e4 2012{
47e65328 2013 return list_empty(&p->thread_group);
1da177e4
LT		 2014}
2015
2016#define delay_group_leader(p) \
2017 (thread_group_leader(p) && !thread_group_empty(p))
2018
1da177e4 2019/*
260ea101 2020 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
22e2c507 2021 * subscriptions and synchronises with wait4(). Also used in procfs. Also
ddbcc7e8
PM		 2022 * pins the final release of task.io_context. Also protects ->cpuset and
2023 * ->cgroup.subsys[].
1da177e4
LT		 2024 *
2025 * Nests both inside and outside of read_lock(&tasklist_lock).
2026 * It must not be nested with write_lock_irq(&tasklist_lock),
2027 * neither inside nor outside.
2028 */
2029static inline void task_lock(struct task_struct *p)
2030{
2031 spin_lock(&p->alloc_lock);
2032}
2033
2034static inline void task_unlock(struct task_struct *p)
2035{
2036 spin_unlock(&p->alloc_lock);
2037}
2038
f63ee72e
ON		 2039extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2040 unsigned long *flags);
2041
2042static inline void unlock_task_sighand(struct task_struct *tsk,
2043 unsigned long *flags)
2044{
2045 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2046}
2047
f037360f
AV		 2048#ifndef __HAVE_THREAD_FUNCTIONS
2049
f7e4217b
RZ		 2050#define task_thread_info(task) ((struct thread_info *)(task)->stack)
2051#define task_stack_page(task) ((task)->stack)
a1261f54 2052
10ebffde
AV		 2053static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2054{
2055 *task_thread_info(p) = *task_thread_info(org);
2056 task_thread_info(p)->task = p;
2057}
2058
2059static inline unsigned long *end_of_stack(struct task_struct *p)
2060{
f7e4217b 2061 return (unsigned long *)(task_thread_info(p) + 1);
10ebffde
AV		 2062}
2063
f037360f
AV		 2064#endif
2065
8b05c7e6
FT		 2066static inline int object_is_on_stack(void *obj)
2067{
2068 void *stack = task_stack_page(current);
2069
2070 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2071}
2072
8c9843e5
BH		 2073extern void thread_info_cache_init(void);
2074
1da177e4
LT		 2075/* set thread flags in other task's structures
2076 * - see asm/thread_info.h for TIF_xxxx flags available
2077 */
2078static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2079{
a1261f54 2080 set_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 2081}
2082
2083static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2084{
a1261f54 2085 clear_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 2086}
2087
2088static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2089{
a1261f54 2090 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 2091}
2092
2093static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2094{
a1261f54 2095 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 2096}
2097
2098static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2099{
a1261f54 2100 return test_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 2101}
2102
2103static inline void set_tsk_need_resched(struct task_struct *tsk)
2104{
2105 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2106}
2107
2108static inline void clear_tsk_need_resched(struct task_struct *tsk)
2109{
2110 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2111}
2112
8ae121ac
GH		 2113static inline int test_tsk_need_resched(struct task_struct *tsk)
2114{
2115 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2116}
2117
1da177e4
LT		 2118static inline int signal_pending(struct task_struct *p)
2119{
2120 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2121}
f776d12d 2122
b3c97528 2123extern int __fatal_signal_pending(struct task_struct *p);
f776d12d
MW		 2124
2125static inline int fatal_signal_pending(struct task_struct *p)
2126{
2127 return signal_pending(p) && __fatal_signal_pending(p);
2128}
2129
16882c1e
ON		 2130static inline int signal_pending_state(long state, struct task_struct *p)
2131{
2132 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2133 return 0;
2134 if (!signal_pending(p))
2135 return 0;
2136
16882c1e
ON		 2137 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2138}
2139
1da177e4
LT		 2140static inline int need_resched(void)
2141{
9404ef02 2142 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1da177e4
LT		 2143}
2144
2145/*
2146 * cond_resched() and cond_resched_lock(): latency reduction via
2147 * explicit rescheduling in places that are safe. The return
2148 * value indicates whether a reschedule was done in fact.
2149 * cond_resched_lock() will drop the spinlock before scheduling,
2150 * cond_resched_softirq() will enable bhs before scheduling.
2151 */
c3921ab7 2152extern int _cond_resched(void);
c714a534 2153#ifdef CONFIG_PREEMPT_BKL
02b67cc3
HX		 2154static inline int cond_resched(void)
2155{
2156 return 0;
2157}
2158#else
02b67cc3
HX		 2159static inline int cond_resched(void)
2160{
2161 return _cond_resched();
2162}
2163#endif
1da177e4
LT		 2164extern int cond_resched_lock(spinlock_t * lock);
2165extern int cond_resched_softirq(void);
c3921ab7
LT		 2166static inline int cond_resched_bkl(void)
2167{
2168 return _cond_resched();
2169}
1da177e4
LT		 2170
2171/*
2172 * Does a critical section need to be broken due to another
95c354fe
NP		 2173 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2174 * but a general need for low latency)
1da177e4 2175 */
95c354fe 2176static inline int spin_needbreak(spinlock_t *lock)
1da177e4 2177{
95c354fe
NP		 2178#ifdef CONFIG_PREEMPT
2179 return spin_is_contended(lock);
2180#else
1da177e4 2181 return 0;
95c354fe 2182#endif
1da177e4
LT		 2183}
2184
f06febc9
FM		 2185/*
2186 * Thread group CPU time accounting.
2187 */
f06febc9 2188
490dea45
PZ		 2189static inline
2190void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
f06febc9 2191{
490dea45
PZ		 2192 struct task_cputime *totals = &tsk->signal->cputime.totals;
2193 unsigned long flags;
2194
2195 spin_lock_irqsave(&totals->lock, flags);
2196 *times = *totals;
2197 spin_unlock_irqrestore(&totals->lock, flags);
f06febc9
FM		 2198}
2199
490dea45 2200static inline void thread_group_cputime_init(struct signal_struct *sig)
f06febc9 2201{
490dea45
PZ		 2202 sig->cputime.totals = (struct task_cputime){
2203 .utime = cputime_zero,
2204 .stime = cputime_zero,
2205 .sum_exec_runtime = 0,
2206 };
2207
2208 spin_lock_init(&sig->cputime.totals.lock);
f06febc9
FM		 2209}
2210
f06febc9
FM		 2211static inline void thread_group_cputime_free(struct signal_struct *sig)
2212{
f06febc9
FM		 2213}
2214
7bb44ade
RM		 2215/*
2216 * Reevaluate whether the task has signals pending delivery.
2217 * Wake the task if so.
2218 * This is required every time the blocked sigset_t changes.
2219 * callers must hold sighand->siglock.
2220 */
2221extern void recalc_sigpending_and_wake(struct task_struct *t);
1da177e4
LT		 2222extern void recalc_sigpending(void);
2223
2224extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2225
2226/*
2227 * Wrappers for p->thread_info->cpu access. No-op on UP.
2228 */
2229#ifdef CONFIG_SMP
2230
2231static inline unsigned int task_cpu(const struct task_struct *p)
2232{
a1261f54 2233 return task_thread_info(p)->cpu;
1da177e4
LT		 2234}
2235
c65cc870 2236extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
1da177e4
LT		 2237
2238#else
2239
2240static inline unsigned int task_cpu(const struct task_struct *p)
2241{
2242 return 0;
2243}
2244
2245static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2246{
2247}
2248
2249#endif /* CONFIG_SMP */
2250
1da177e4 2251extern void arch_pick_mmap_layout(struct mm_struct *mm);
1da177e4 2252
1a3c3034
IM		 2253#ifdef CONFIG_TRACING
2254extern void
2255__trace_special(void *__tr, void *__data,
2256 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2257#else
2258static inline void
2259__trace_special(void *__tr, void *__data,
2260 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2261{
2262}
2263#endif
2264
96f874e2
RR		 2265extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2266extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
5c45bf27 2267
1da177e4
LT		 2268extern void normalize_rt_tasks(void);
2269
052f1dc7 2270#ifdef CONFIG_GROUP_SCHED
9b5b7751 2271
4cf86d77 2272extern struct task_group init_task_group;
eff766a6
PZ		 2273#ifdef CONFIG_USER_SCHED
2274extern struct task_group root_task_group;
6c415b92 2275extern void set_tg_uid(struct user_struct *user);
eff766a6 2276#endif
9b5b7751 2277
ec7dc8ac 2278extern struct task_group *sched_create_group(struct task_group *parent);
4cf86d77 2279extern void sched_destroy_group(struct task_group *tg);
9b5b7751 2280extern void sched_move_task(struct task_struct *tsk);
052f1dc7 2281#ifdef CONFIG_FAIR_GROUP_SCHED
4cf86d77 2282extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
5cb350ba 2283extern unsigned long sched_group_shares(struct task_group *tg);
052f1dc7
PZ		 2284#endif
2285#ifdef CONFIG_RT_GROUP_SCHED
9f0c1e56
PZ		 2286extern int sched_group_set_rt_runtime(struct task_group *tg,
2287 long rt_runtime_us);
2288extern long sched_group_rt_runtime(struct task_group *tg);
d0b27fa7
PZ		 2289extern int sched_group_set_rt_period(struct task_group *tg,
2290 long rt_period_us);
2291extern long sched_group_rt_period(struct task_group *tg);
052f1dc7 2292#endif
9b5b7751
SV		 2293#endif
2294
4b98d11b
AD		 2295#ifdef CONFIG_TASK_XACCT
2296static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2297{
940389b8 2298 tsk->ioac.rchar += amt;
4b98d11b
AD		 2299}
2300
2301static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2302{
940389b8 2303 tsk->ioac.wchar += amt;
4b98d11b
AD		 2304}
2305
2306static inline void inc_syscr(struct task_struct *tsk)
2307{
940389b8 2308 tsk->ioac.syscr++;
4b98d11b
AD		 2309}
2310
2311static inline void inc_syscw(struct task_struct *tsk)
2312{
940389b8 2313 tsk->ioac.syscw++;
4b98d11b
AD		 2314}
2315#else
2316static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2317{
2318}
2319
2320static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2321{
2322}
2323
2324static inline void inc_syscr(struct task_struct *tsk)
2325{
2326}
2327
2328static inline void inc_syscw(struct task_struct *tsk)
2329{
2330}
2331#endif
2332
82455257
DH		 2333#ifndef TASK_SIZE_OF
2334#define TASK_SIZE_OF(tsk) TASK_SIZE
2335#endif
2336
cf475ad2
BS		 2337#ifdef CONFIG_MM_OWNER
2338extern void mm_update_next_owner(struct mm_struct *mm);
2339extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2340#else
2341static inline void mm_update_next_owner(struct mm_struct *mm)
2342{
2343}
2344
2345static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2346{
2347}
2348#endif /* CONFIG_MM_OWNER */
2349
7c731e0a
SR		 2350#define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2351
1da177e4
LT		 2352#endif /* __KERNEL__ */
2353
2354#endif
Linux kernel - Deliverables
This page took 0.915377 seconds and 5 git commands to generate.