sched: Add TASK_WAKING
[GitHub/mt8127/android_kernel_alcatel_ttab.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
ca94c442
LP
41/* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
42#define SCHED_RESET_ON_FORK 0x40000000
b7b3c76a 43
a3b6714e 44#ifdef __KERNEL__
b7b3c76a
DW
45
46struct sched_param {
47 int sched_priority;
48};
49
1da177e4
LT
50#include <asm/param.h> /* for HZ */
51
1da177e4
LT
52#include <linux/capability.h>
53#include <linux/threads.h>
54#include <linux/kernel.h>
55#include <linux/types.h>
56#include <linux/timex.h>
57#include <linux/jiffies.h>
58#include <linux/rbtree.h>
59#include <linux/thread_info.h>
60#include <linux/cpumask.h>
61#include <linux/errno.h>
62#include <linux/nodemask.h>
c92ff1bd 63#include <linux/mm_types.h>
1da177e4
LT
64
65#include <asm/system.h>
1da177e4
LT
66#include <asm/page.h>
67#include <asm/ptrace.h>
1da177e4
LT
68#include <asm/cputime.h>
69
70#include <linux/smp.h>
71#include <linux/sem.h>
72#include <linux/signal.h>
5ad4e53b 73#include <linux/path.h>
1da177e4
LT
74#include <linux/compiler.h>
75#include <linux/completion.h>
76#include <linux/pid.h>
77#include <linux/percpu.h>
78#include <linux/topology.h>
3e26c149 79#include <linux/proportions.h>
1da177e4 80#include <linux/seccomp.h>
e56d0903 81#include <linux/rcupdate.h>
05725f7e 82#include <linux/rculist.h>
23f78d4a 83#include <linux/rtmutex.h>
1da177e4 84
a3b6714e
DW
85#include <linux/time.h>
86#include <linux/param.h>
87#include <linux/resource.h>
88#include <linux/timer.h>
89#include <linux/hrtimer.h>
7c3ab738 90#include <linux/task_io_accounting.h>
5cb350ba 91#include <linux/kobject.h>
9745512c 92#include <linux/latencytop.h>
9e2b2dc4 93#include <linux/cred.h>
a3b6714e
DW
94
95#include <asm/processor.h>
36d57ac4 96
1da177e4 97struct exec_domain;
c87e2837 98struct futex_pi_state;
286100a6 99struct robust_list_head;
d89d8796 100struct bio;
5ad4e53b 101struct fs_struct;
e2b371f0 102struct bts_context;
a63eaf34 103struct perf_counter_context;
1da177e4 104
1da177e4
LT
105/*
106 * List of flags we want to share for kernel threads,
107 * if only because they are not used by them anyway.
108 */
109#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
110
111/*
112 * These are the constant used to fake the fixed-point load-average
113 * counting. Some notes:
114 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
115 * a load-average precision of 10 bits integer + 11 bits fractional
116 * - if you want to count load-averages more often, you need more
117 * precision, or rounding will get you. With 2-second counting freq,
118 * the EXP_n values would be 1981, 2034 and 2043 if still using only
119 * 11 bit fractions.
120 */
121extern unsigned long avenrun[]; /* Load averages */
2d02494f 122extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
1da177e4
LT
123
124#define FSHIFT 11 /* nr of bits of precision */
125#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
0c2043ab 126#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
1da177e4
LT
127#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
128#define EXP_5 2014 /* 1/exp(5sec/5min) */
129#define EXP_15 2037 /* 1/exp(5sec/15min) */
130
131#define CALC_LOAD(load,exp,n) \
132 load *= exp; \
133 load += n*(FIXED_1-exp); \
134 load >>= FSHIFT;
135
136extern unsigned long total_forks;
137extern int nr_threads;
1da177e4
LT
138DECLARE_PER_CPU(unsigned long, process_counts);
139extern int nr_processes(void);
140extern unsigned long nr_running(void);
141extern unsigned long nr_uninterruptible(void);
142extern unsigned long nr_iowait(void);
dce48a84 143extern void calc_global_load(void);
23a185ca 144extern u64 cpu_nr_migrations(int cpu);
1da177e4 145
7e49fcce
SR
146extern unsigned long get_parent_ip(unsigned long addr);
147
43ae34cb
IM
148struct seq_file;
149struct cfs_rq;
4cf86d77 150struct task_group;
43ae34cb
IM
151#ifdef CONFIG_SCHED_DEBUG
152extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
153extern void proc_sched_set_task(struct task_struct *p);
154extern void
5cef9eca 155print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
43ae34cb
IM
156#else
157static inline void
158proc_sched_show_task(struct task_struct *p, struct seq_file *m)
159{
160}
161static inline void proc_sched_set_task(struct task_struct *p)
162{
163}
164static inline void
5cef9eca 165print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
43ae34cb
IM
166{
167}
168#endif
1da177e4 169
690229a0
IM
170extern unsigned long long time_sync_thresh;
171
4a8342d2
LT
172/*
173 * Task state bitmask. NOTE! These bits are also
174 * encoded in fs/proc/array.c: get_task_state().
175 *
176 * We have two separate sets of flags: task->state
177 * is about runnability, while task->exit_state are
178 * about the task exiting. Confusing, but this way
179 * modifying one set can't modify the other one by
180 * mistake.
181 */
1da177e4
LT
182#define TASK_RUNNING 0
183#define TASK_INTERRUPTIBLE 1
184#define TASK_UNINTERRUPTIBLE 2
f021a3c2
MW
185#define __TASK_STOPPED 4
186#define __TASK_TRACED 8
4a8342d2
LT
187/* in tsk->exit_state */
188#define EXIT_ZOMBIE 16
189#define EXIT_DEAD 32
190/* in tsk->state again */
af927232 191#define TASK_DEAD 64
f021a3c2 192#define TASK_WAKEKILL 128
e9c84311 193#define TASK_WAKING 256
f021a3c2
MW
194
195/* Convenience macros for the sake of set_task_state */
196#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
197#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
198#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
1da177e4 199
92a1f4bc
MW
200/* Convenience macros for the sake of wake_up */
201#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
f021a3c2 202#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
92a1f4bc
MW
203
204/* get_task_state() */
205#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
f021a3c2
MW
206 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
207 __TASK_TRACED)
92a1f4bc 208
f021a3c2
MW
209#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
210#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
92a1f4bc 211#define task_is_stopped_or_traced(task) \
f021a3c2 212 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
92a1f4bc 213#define task_contributes_to_load(task) \
e3c8ca83 214 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
6301cb95 215 (task->flags & PF_FREEZING) == 0)
1da177e4
LT
216
217#define __set_task_state(tsk, state_value) \
218 do { (tsk)->state = (state_value); } while (0)
219#define set_task_state(tsk, state_value) \
220 set_mb((tsk)->state, (state_value))
221
498d0c57
AM
222/*
223 * set_current_state() includes a barrier so that the write of current->state
224 * is correctly serialised wrt the caller's subsequent test of whether to
225 * actually sleep:
226 *
227 * set_current_state(TASK_UNINTERRUPTIBLE);
228 * if (do_i_need_to_sleep())
229 * schedule();
230 *
231 * If the caller does not need such serialisation then use __set_current_state()
232 */
1da177e4
LT
233#define __set_current_state(state_value) \
234 do { current->state = (state_value); } while (0)
235#define set_current_state(state_value) \
236 set_mb(current->state, (state_value))
237
238/* Task command name length */
239#define TASK_COMM_LEN 16
240
1da177e4
LT
241#include <linux/spinlock.h>
242
243/*
244 * This serializes "schedule()" and also protects
245 * the run-queue from deletions/modifications (but
246 * _adding_ to the beginning of the run-queue has
247 * a separate lock).
248 */
249extern rwlock_t tasklist_lock;
250extern spinlock_t mmlist_lock;
251
36c8b586 252struct task_struct;
1da177e4
LT
253
254extern void sched_init(void);
255extern void sched_init_smp(void);
2d07b255 256extern asmlinkage void schedule_tail(struct task_struct *prev);
36c8b586 257extern void init_idle(struct task_struct *idle, int cpu);
1df21055 258extern void init_idle_bootup_task(struct task_struct *idle);
1da177e4 259
017730c1 260extern int runqueue_is_locked(void);
ad474cac 261extern void task_rq_unlock_wait(struct task_struct *p);
017730c1 262
6a7b3dc3 263extern cpumask_var_t nohz_cpu_mask;
46cb4b7c
SS
264#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
265extern int select_nohz_load_balancer(int cpu);
eea08f32 266extern int get_nohz_load_balancer(void);
46cb4b7c
SS
267#else
268static inline int select_nohz_load_balancer(int cpu)
269{
270 return 0;
271}
272#endif
1da177e4 273
e59e2ae2 274/*
39bc89fd 275 * Only dump TASK_* tasks. (0 for all tasks)
e59e2ae2
IM
276 */
277extern void show_state_filter(unsigned long state_filter);
278
279static inline void show_state(void)
280{
39bc89fd 281 show_state_filter(0);
e59e2ae2
IM
282}
283
1da177e4
LT
284extern void show_regs(struct pt_regs *);
285
286/*
287 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
288 * task), SP is the stack pointer of the first frame that should be shown in the back
289 * trace (or NULL if the entire call-chain of the task should be shown).
290 */
291extern void show_stack(struct task_struct *task, unsigned long *sp);
292
293void io_schedule(void);
294long io_schedule_timeout(long timeout);
295
296extern void cpu_init (void);
297extern void trap_init(void);
298extern void update_process_times(int user);
299extern void scheduler_tick(void);
300
82a1fcb9
IM
301extern void sched_show_task(struct task_struct *p);
302
8446f1d3 303#ifdef CONFIG_DETECT_SOFTLOCKUP
6687a97d 304extern void softlockup_tick(void);
8446f1d3 305extern void touch_softlockup_watchdog(void);
04c9167f 306extern void touch_all_softlockup_watchdogs(void);
baf48f65
MSB
307extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
308 struct file *filp, void __user *buffer,
309 size_t *lenp, loff_t *ppos);
9c44bc03 310extern unsigned int softlockup_panic;
9383d967 311extern int softlockup_thresh;
8446f1d3 312#else
6687a97d 313static inline void softlockup_tick(void)
8446f1d3
IM
314{
315}
8446f1d3
IM
316static inline void touch_softlockup_watchdog(void)
317{
318}
04c9167f
JF
319static inline void touch_all_softlockup_watchdogs(void)
320{
321}
8446f1d3
IM
322#endif
323
e162b39a
MSB
324#ifdef CONFIG_DETECT_HUNG_TASK
325extern unsigned int sysctl_hung_task_panic;
326extern unsigned long sysctl_hung_task_check_count;
327extern unsigned long sysctl_hung_task_timeout_secs;
328extern unsigned long sysctl_hung_task_warnings;
329extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
330 struct file *filp, void __user *buffer,
331 size_t *lenp, loff_t *ppos);
332#endif
8446f1d3 333
1da177e4
LT
334/* Attach to any functions which should be ignored in wchan output. */
335#define __sched __attribute__((__section__(".sched.text")))
deaf2227
IM
336
337/* Linker adds these: start and end of __sched functions */
338extern char __sched_text_start[], __sched_text_end[];
339
1da177e4
LT
340/* Is this address in the __sched functions? */
341extern int in_sched_functions(unsigned long addr);
342
343#define MAX_SCHEDULE_TIMEOUT LONG_MAX
b3c97528 344extern signed long schedule_timeout(signed long timeout);
64ed93a2 345extern signed long schedule_timeout_interruptible(signed long timeout);
294d5cc2 346extern signed long schedule_timeout_killable(signed long timeout);
64ed93a2 347extern signed long schedule_timeout_uninterruptible(signed long timeout);
41719b03 348asmlinkage void __schedule(void);
1da177e4 349asmlinkage void schedule(void);
0d66bf6d 350extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner);
1da177e4 351
ab516013 352struct nsproxy;
acce292c 353struct user_namespace;
1da177e4 354
341c87bf
KH
355/*
356 * Default maximum number of active map areas, this limits the number of vmas
357 * per mm struct. Users can overwrite this number by sysctl but there is a
358 * problem.
359 *
360 * When a program's coredump is generated as ELF format, a section is created
361 * per a vma. In ELF, the number of sections is represented in unsigned short.
362 * This means the number of sections should be smaller than 65535 at coredump.
363 * Because the kernel adds some informative sections to a image of program at
364 * generating coredump, we need some margin. The number of extra sections is
365 * 1-3 now and depends on arch. We use "5" as safe margin, here.
366 */
367#define MAPCOUNT_ELF_CORE_MARGIN (5)
368#define DEFAULT_MAX_MAP_COUNT (USHORT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
1da177e4
LT
369
370extern int sysctl_max_map_count;
371
372#include <linux/aio.h>
373
374extern unsigned long
375arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
376 unsigned long, unsigned long);
377extern unsigned long
378arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
379 unsigned long len, unsigned long pgoff,
380 unsigned long flags);
1363c3cd
WW
381extern void arch_unmap_area(struct mm_struct *, unsigned long);
382extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
1da177e4 383
f7d0b926 384#if USE_SPLIT_PTLOCKS
f412ac08
HD
385/*
386 * The mm counters are not protected by its page_table_lock,
387 * so must be incremented atomically.
388 */
d3cb4871
CL
389#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
390#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
391#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
392#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
393#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
f412ac08 394
f7d0b926 395#else /* !USE_SPLIT_PTLOCKS */
f412ac08
HD
396/*
397 * The mm counters are protected by its page_table_lock,
398 * so can be incremented directly.
399 */
1da177e4
LT
400#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
401#define get_mm_counter(mm, member) ((mm)->_##member)
402#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
403#define inc_mm_counter(mm, member) (mm)->_##member++
404#define dec_mm_counter(mm, member) (mm)->_##member--
f412ac08 405
f7d0b926 406#endif /* !USE_SPLIT_PTLOCKS */
4294621f 407
f412ac08
HD
408#define get_mm_rss(mm) \
409 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
365e9c87
HD
410#define update_hiwater_rss(mm) do { \
411 unsigned long _rss = get_mm_rss(mm); \
412 if ((mm)->hiwater_rss < _rss) \
413 (mm)->hiwater_rss = _rss; \
414} while (0)
415#define update_hiwater_vm(mm) do { \
416 if ((mm)->hiwater_vm < (mm)->total_vm) \
417 (mm)->hiwater_vm = (mm)->total_vm; \
418} while (0)
419
9de1581e
ON
420static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
421{
422 return max(mm->hiwater_rss, get_mm_rss(mm));
423}
424
425static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
426{
427 return max(mm->hiwater_vm, mm->total_vm);
428}
901608d9 429
6c5d5238
KH
430extern void set_dumpable(struct mm_struct *mm, int value);
431extern int get_dumpable(struct mm_struct *mm);
432
433/* mm flags */
3cb4a0bb 434/* dumpable bits */
6c5d5238
KH
435#define MMF_DUMPABLE 0 /* core dump is permitted */
436#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
3cb4a0bb
KH
437#define MMF_DUMPABLE_BITS 2
438
439/* coredump filter bits */
440#define MMF_DUMP_ANON_PRIVATE 2
441#define MMF_DUMP_ANON_SHARED 3
442#define MMF_DUMP_MAPPED_PRIVATE 4
443#define MMF_DUMP_MAPPED_SHARED 5
82df3973 444#define MMF_DUMP_ELF_HEADERS 6
e575f111
KM
445#define MMF_DUMP_HUGETLB_PRIVATE 7
446#define MMF_DUMP_HUGETLB_SHARED 8
3cb4a0bb 447#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
e575f111 448#define MMF_DUMP_FILTER_BITS 7
3cb4a0bb
KH
449#define MMF_DUMP_FILTER_MASK \
450 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
451#define MMF_DUMP_FILTER_DEFAULT \
e575f111 452 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
656eb2cd
RM
453 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
454
455#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
456# define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
457#else
458# define MMF_DUMP_MASK_DEFAULT_ELF 0
459#endif
6c5d5238 460
1da177e4
LT
461struct sighand_struct {
462 atomic_t count;
463 struct k_sigaction action[_NSIG];
464 spinlock_t siglock;
b8fceee1 465 wait_queue_head_t signalfd_wqh;
1da177e4
LT
466};
467
0e464814 468struct pacct_struct {
f6ec29a4
KK
469 int ac_flag;
470 long ac_exitcode;
0e464814 471 unsigned long ac_mem;
77787bfb
KK
472 cputime_t ac_utime, ac_stime;
473 unsigned long ac_minflt, ac_majflt;
0e464814
KK
474};
475
f06febc9
FM
476/**
477 * struct task_cputime - collected CPU time counts
478 * @utime: time spent in user mode, in &cputime_t units
479 * @stime: time spent in kernel mode, in &cputime_t units
480 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
5ce73a4a 481 *
f06febc9
FM
482 * This structure groups together three kinds of CPU time that are
483 * tracked for threads and thread groups. Most things considering
484 * CPU time want to group these counts together and treat all three
485 * of them in parallel.
486 */
487struct task_cputime {
488 cputime_t utime;
489 cputime_t stime;
490 unsigned long long sum_exec_runtime;
491};
492/* Alternate field names when used to cache expirations. */
493#define prof_exp stime
494#define virt_exp utime
495#define sched_exp sum_exec_runtime
496
4cd4c1b4
PZ
497#define INIT_CPUTIME \
498 (struct task_cputime) { \
499 .utime = cputime_zero, \
500 .stime = cputime_zero, \
501 .sum_exec_runtime = 0, \
502 }
503
c99e6efe
PZ
504/*
505 * Disable preemption until the scheduler is running.
506 * Reset by start_kernel()->sched_init()->init_idle().
d86ee480
PZ
507 *
508 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
509 * before the scheduler is active -- see should_resched().
c99e6efe 510 */
d86ee480 511#define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
c99e6efe 512
f06febc9 513/**
4cd4c1b4
PZ
514 * struct thread_group_cputimer - thread group interval timer counts
515 * @cputime: thread group interval timers.
516 * @running: non-zero when there are timers running and
517 * @cputime receives updates.
518 * @lock: lock for fields in this struct.
f06febc9
FM
519 *
520 * This structure contains the version of task_cputime, above, that is
4cd4c1b4 521 * used for thread group CPU timer calculations.
f06febc9 522 */
4cd4c1b4
PZ
523struct thread_group_cputimer {
524 struct task_cputime cputime;
525 int running;
526 spinlock_t lock;
f06febc9 527};
f06febc9 528
1da177e4
LT
529/*
530 * NOTE! "signal_struct" does not have it's own
531 * locking, because a shared signal_struct always
532 * implies a shared sighand_struct, so locking
533 * sighand_struct is always a proper superset of
534 * the locking of signal_struct.
535 */
536struct signal_struct {
537 atomic_t count;
538 atomic_t live;
539
540 wait_queue_head_t wait_chldexit; /* for wait4() */
541
542 /* current thread group signal load-balancing target: */
36c8b586 543 struct task_struct *curr_target;
1da177e4
LT
544
545 /* shared signal handling: */
546 struct sigpending shared_pending;
547
548 /* thread group exit support */
549 int group_exit_code;
550 /* overloaded:
551 * - notify group_exit_task when ->count is equal to notify_count
552 * - everyone except group_exit_task is stopped during signal delivery
553 * of fatal signals, group_exit_task processes the signal.
554 */
1da177e4 555 int notify_count;
07dd20e0 556 struct task_struct *group_exit_task;
1da177e4
LT
557
558 /* thread group stop support, overloads group_exit_code too */
559 int group_stop_count;
560 unsigned int flags; /* see SIGNAL_* flags below */
561
562 /* POSIX.1b Interval Timers */
563 struct list_head posix_timers;
564
565 /* ITIMER_REAL timer for the process */
2ff678b8 566 struct hrtimer real_timer;
fea9d175 567 struct pid *leader_pid;
2ff678b8 568 ktime_t it_real_incr;
1da177e4
LT
569
570 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
571 cputime_t it_prof_expires, it_virt_expires;
572 cputime_t it_prof_incr, it_virt_incr;
573
f06febc9 574 /*
4cd4c1b4
PZ
575 * Thread group totals for process CPU timers.
576 * See thread_group_cputimer(), et al, for details.
f06febc9 577 */
4cd4c1b4 578 struct thread_group_cputimer cputimer;
f06febc9
FM
579
580 /* Earliest-expiration cache. */
581 struct task_cputime cputime_expires;
582
583 struct list_head cpu_timers[3];
584
ab521dc0 585 struct pid *tty_old_pgrp;
1ec320af 586
1da177e4
LT
587 /* boolean value for session group leader */
588 int leader;
589
590 struct tty_struct *tty; /* NULL if no tty */
591
592 /*
593 * Cumulative resource counters for dead threads in the group,
594 * and for reaped dead child processes forked by this group.
595 * Live threads maintain their own counters and add to these
596 * in __exit_signal, except for the group leader.
597 */
32bd671d 598 cputime_t utime, stime, cutime, cstime;
9ac52315
LV
599 cputime_t gtime;
600 cputime_t cgtime;
1da177e4
LT
601 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
602 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
6eaeeaba 603 unsigned long inblock, oublock, cinblock, coublock;
940389b8 604 struct task_io_accounting ioac;
1da177e4 605
32bd671d
PZ
606 /*
607 * Cumulative ns of schedule CPU time fo dead threads in the
608 * group, not including a zombie group leader, (This only differs
609 * from jiffies_to_ns(utime + stime) if sched_clock uses something
610 * other than jiffies.)
611 */
612 unsigned long long sum_sched_runtime;
613
1da177e4
LT
614 /*
615 * We don't bother to synchronize most readers of this at all,
616 * because there is no reader checking a limit that actually needs
617 * to get both rlim_cur and rlim_max atomically, and either one
618 * alone is a single word that can safely be read normally.
619 * getrlimit/setrlimit use task_lock(current->group_leader) to
620 * protect this instead of the siglock, because they really
621 * have no need to disable irqs.
622 */
623 struct rlimit rlim[RLIM_NLIMITS];
624
0e464814
KK
625#ifdef CONFIG_BSD_PROCESS_ACCT
626 struct pacct_struct pacct; /* per-process accounting information */
627#endif
ad4ecbcb 628#ifdef CONFIG_TASKSTATS
ad4ecbcb
SN
629 struct taskstats *stats;
630#endif
522ed776
MT
631#ifdef CONFIG_AUDIT
632 unsigned audit_tty;
633 struct tty_audit_buf *tty_audit_buf;
634#endif
1da177e4
LT
635};
636
4866cde0
NP
637/* Context switch must be unlocked if interrupts are to be enabled */
638#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
639# define __ARCH_WANT_UNLOCKED_CTXSW
640#endif
641
1da177e4
LT
642/*
643 * Bits in flags field of signal_struct.
644 */
645#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
646#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
647#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
648#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
e4420551
ON
649/*
650 * Pending notifications to parent.
651 */
652#define SIGNAL_CLD_STOPPED 0x00000010
653#define SIGNAL_CLD_CONTINUED 0x00000020
654#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
1da177e4 655
fae5fa44
ON
656#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
657
ed5d2cac
ON
658/* If true, all threads except ->group_exit_task have pending SIGKILL */
659static inline int signal_group_exit(const struct signal_struct *sig)
660{
661 return (sig->flags & SIGNAL_GROUP_EXIT) ||
662 (sig->group_exit_task != NULL);
663}
664
1da177e4
LT
665/*
666 * Some day this will be a full-fledged user tracking system..
667 */
668struct user_struct {
669 atomic_t __count; /* reference count */
670 atomic_t processes; /* How many processes does this user have? */
671 atomic_t files; /* How many open files does this user have? */
672 atomic_t sigpending; /* How many pending signals does this user have? */
2d9048e2 673#ifdef CONFIG_INOTIFY_USER
0eeca283
RL
674 atomic_t inotify_watches; /* How many inotify watches does this user have? */
675 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
676#endif
7ef9964e 677#ifdef CONFIG_EPOLL
7ef9964e
DL
678 atomic_t epoll_watches; /* The number of file descriptors currently watched */
679#endif
970a8645 680#ifdef CONFIG_POSIX_MQUEUE
1da177e4
LT
681 /* protected by mq_lock */
682 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
970a8645 683#endif
1da177e4
LT
684 unsigned long locked_shm; /* How many pages of mlocked shm ? */
685
686#ifdef CONFIG_KEYS
687 struct key *uid_keyring; /* UID specific keyring */
688 struct key *session_keyring; /* UID's default session keyring */
689#endif
690
691 /* Hash table maintenance information */
735de223 692 struct hlist_node uidhash_node;
1da177e4 693 uid_t uid;
18b6e041 694 struct user_namespace *user_ns;
24e377a8 695
052f1dc7 696#ifdef CONFIG_USER_SCHED
4cf86d77 697 struct task_group *tg;
b1a8c172 698#ifdef CONFIG_SYSFS
eb41d946 699 struct kobject kobj;
3959214f 700 struct delayed_work work;
24e377a8 701#endif
b1a8c172 702#endif
789f90fc
PZ
703
704#ifdef CONFIG_PERF_COUNTERS
705 atomic_long_t locked_vm;
706#endif
1da177e4
LT
707};
708
eb41d946 709extern int uids_sysfs_init(void);
5cb350ba 710
1da177e4
LT
711extern struct user_struct *find_user(uid_t);
712
713extern struct user_struct root_user;
714#define INIT_USER (&root_user)
715
b6dff3ec 716
1da177e4
LT
717struct backing_dev_info;
718struct reclaim_state;
719
52f17b6c 720#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1da177e4
LT
721struct sched_info {
722 /* cumulative counters */
2d72376b 723 unsigned long pcount; /* # of times run on this cpu */
9c2c4802 724 unsigned long long run_delay; /* time spent waiting on a runqueue */
1da177e4
LT
725
726 /* timestamps */
172ba844
BS
727 unsigned long long last_arrival,/* when we last ran on a cpu */
728 last_queued; /* when we were last queued to run */
b8efb561
IM
729#ifdef CONFIG_SCHEDSTATS
730 /* BKL stats */
480b9434 731 unsigned int bkl_count;
b8efb561 732#endif
1da177e4 733};
52f17b6c 734#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
1da177e4 735
ca74e92b
SN
736#ifdef CONFIG_TASK_DELAY_ACCT
737struct task_delay_info {
738 spinlock_t lock;
739 unsigned int flags; /* Private per-task flags */
740
741 /* For each stat XXX, add following, aligned appropriately
742 *
743 * struct timespec XXX_start, XXX_end;
744 * u64 XXX_delay;
745 * u32 XXX_count;
746 *
747 * Atomicity of updates to XXX_delay, XXX_count protected by
748 * single lock above (split into XXX_lock if contention is an issue).
749 */
0ff92245
SN
750
751 /*
752 * XXX_count is incremented on every XXX operation, the delay
753 * associated with the operation is added to XXX_delay.
754 * XXX_delay contains the accumulated delay time in nanoseconds.
755 */
756 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
757 u64 blkio_delay; /* wait for sync block io completion */
758 u64 swapin_delay; /* wait for swapin block io completion */
759 u32 blkio_count; /* total count of the number of sync block */
760 /* io operations performed */
761 u32 swapin_count; /* total count of the number of swapin block */
762 /* io operations performed */
873b4771
KK
763
764 struct timespec freepages_start, freepages_end;
765 u64 freepages_delay; /* wait for memory reclaim */
766 u32 freepages_count; /* total count of memory reclaim */
ca74e92b 767};
52f17b6c
CS
768#endif /* CONFIG_TASK_DELAY_ACCT */
769
770static inline int sched_info_on(void)
771{
772#ifdef CONFIG_SCHEDSTATS
773 return 1;
774#elif defined(CONFIG_TASK_DELAY_ACCT)
775 extern int delayacct_on;
776 return delayacct_on;
777#else
778 return 0;
ca74e92b 779#endif
52f17b6c 780}
ca74e92b 781
d15bcfdb
IM
782enum cpu_idle_type {
783 CPU_IDLE,
784 CPU_NOT_IDLE,
785 CPU_NEWLY_IDLE,
786 CPU_MAX_IDLE_TYPES
1da177e4
LT
787};
788
789/*
790 * sched-domains (multiprocessor balancing) declarations:
791 */
9aa7b369
IM
792
793/*
794 * Increase resolution of nice-level calculations:
795 */
796#define SCHED_LOAD_SHIFT 10
797#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
798
f8700df7 799#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
1da177e4 800
2dd73a4f 801#ifdef CONFIG_SMP
b5d978e0
PZ
802#define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
803#define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
804#define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
805#define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
806#define SD_WAKE_IDLE 0x0010 /* Wake to idle CPU on task wakeup */
807#define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
808#define SD_WAKE_BALANCE 0x0040 /* Perform balancing at task wakeup */
809#define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
810#define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */
811#define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
812#define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
813#define SD_WAKE_IDLE_FAR 0x0800 /* Gain latency sacrificing cache hit */
814#define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
5f3edc1b 815#define SD_BALANCE_WAKE 0x2000 /* Balance on wakeup */
5c45bf27 816
afb8a9b7
GS
817enum powersavings_balance_level {
818 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */
819 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package
820 * first for long running threads
821 */
822 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle
823 * cpu package for power savings
824 */
825 MAX_POWERSAVINGS_BALANCE_LEVELS
826};
89c4710e 827
716707b2 828extern int sched_mc_power_savings, sched_smt_power_savings;
89c4710e 829
716707b2
VS
830static inline int sd_balance_for_mc_power(void)
831{
832 if (sched_smt_power_savings)
833 return SD_POWERSAVINGS_BALANCE;
5c45bf27 834
b5d978e0 835 return SD_PREFER_SIBLING;
716707b2 836}
89c4710e 837
716707b2
VS
838static inline int sd_balance_for_package_power(void)
839{
840 if (sched_mc_power_savings | sched_smt_power_savings)
841 return SD_POWERSAVINGS_BALANCE;
842
b5d978e0 843 return SD_PREFER_SIBLING;
716707b2 844}
5c45bf27 845
100fdaee
VS
846/*
847 * Optimise SD flags for power savings:
848 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
849 * Keep default SD flags if sched_{smt,mc}_power_saving=0
850 */
851
852static inline int sd_power_saving_flags(void)
853{
854 if (sched_mc_power_savings | sched_smt_power_savings)
855 return SD_BALANCE_NEWIDLE;
856
857 return 0;
858}
1da177e4
LT
859
860struct sched_group {
861 struct sched_group *next; /* Must be a circular list */
1da177e4
LT
862
863 /*
864 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
18a3885f 865 * single CPU.
5517d86b 866 */
18a3885f 867 unsigned int cpu_power;
6c99e9ad 868
4200efd9
IM
869 /*
870 * The CPUs this group covers.
871 *
872 * NOTE: this field is variable length. (Allocated dynamically
873 * by attaching extra space to the end of the structure,
874 * depending on how many CPUs the kernel has booted up with)
875 *
876 * It is also be embedded into static data structures at build
877 * time. (See 'struct static_sched_group' in kernel/sched.c)
878 */
879 unsigned long cpumask[0];
1da177e4
LT
880};
881
758b2cdc
RR
882static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
883{
6c99e9ad 884 return to_cpumask(sg->cpumask);
758b2cdc
RR
885}
886
1d3504fc
HS
887enum sched_domain_level {
888 SD_LV_NONE = 0,
889 SD_LV_SIBLING,
890 SD_LV_MC,
891 SD_LV_CPU,
892 SD_LV_NODE,
893 SD_LV_ALLNODES,
894 SD_LV_MAX
895};
896
897struct sched_domain_attr {
898 int relax_domain_level;
899};
900
901#define SD_ATTR_INIT (struct sched_domain_attr) { \
902 .relax_domain_level = -1, \
903}
904
1da177e4
LT
905struct sched_domain {
906 /* These fields must be setup */
907 struct sched_domain *parent; /* top domain must be null terminated */
1a848870 908 struct sched_domain *child; /* bottom domain must be null terminated */
1da177e4 909 struct sched_group *groups; /* the balancing groups of the domain */
1da177e4
LT
910 unsigned long min_interval; /* Minimum balance interval ms */
911 unsigned long max_interval; /* Maximum balance interval ms */
912 unsigned int busy_factor; /* less balancing by factor if busy */
913 unsigned int imbalance_pct; /* No balance until over watermark */
1da177e4 914 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
7897986b
NP
915 unsigned int busy_idx;
916 unsigned int idle_idx;
917 unsigned int newidle_idx;
918 unsigned int wake_idx;
147cbb4b 919 unsigned int forkexec_idx;
a52bfd73 920 unsigned int smt_gain;
1da177e4 921 int flags; /* See SD_* */
1d3504fc 922 enum sched_domain_level level;
1da177e4
LT
923
924 /* Runtime fields. */
925 unsigned long last_balance; /* init to jiffies. units in jiffies */
926 unsigned int balance_interval; /* initialise to 1. units in ms. */
927 unsigned int nr_balance_failed; /* initialise to 0 */
928
2398f2c6
PZ
929 u64 last_update;
930
1da177e4
LT
931#ifdef CONFIG_SCHEDSTATS
932 /* load_balance() stats */
480b9434
KC
933 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
934 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
935 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
936 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
937 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
938 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
939 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
940 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
1da177e4
LT
941
942 /* Active load balancing */
480b9434
KC
943 unsigned int alb_count;
944 unsigned int alb_failed;
945 unsigned int alb_pushed;
1da177e4 946
68767a0a 947 /* SD_BALANCE_EXEC stats */
480b9434
KC
948 unsigned int sbe_count;
949 unsigned int sbe_balanced;
950 unsigned int sbe_pushed;
1da177e4 951
68767a0a 952 /* SD_BALANCE_FORK stats */
480b9434
KC
953 unsigned int sbf_count;
954 unsigned int sbf_balanced;
955 unsigned int sbf_pushed;
68767a0a 956
1da177e4 957 /* try_to_wake_up() stats */
480b9434
KC
958 unsigned int ttwu_wake_remote;
959 unsigned int ttwu_move_affine;
960 unsigned int ttwu_move_balance;
1da177e4 961#endif
a5d8c348
IM
962#ifdef CONFIG_SCHED_DEBUG
963 char *name;
964#endif
6c99e9ad 965
4200efd9
IM
966 /*
967 * Span of all CPUs in this domain.
968 *
969 * NOTE: this field is variable length. (Allocated dynamically
970 * by attaching extra space to the end of the structure,
971 * depending on how many CPUs the kernel has booted up with)
972 *
973 * It is also be embedded into static data structures at build
974 * time. (See 'struct static_sched_domain' in kernel/sched.c)
975 */
976 unsigned long span[0];
1da177e4
LT
977};
978
758b2cdc
RR
979static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
980{
6c99e9ad 981 return to_cpumask(sd->span);
758b2cdc
RR
982}
983
96f874e2 984extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
1d3504fc 985 struct sched_domain_attr *dattr_new);
029190c5 986
06aaf76a
IM
987/* Test a flag in parent sched domain */
988static inline int test_sd_parent(struct sched_domain *sd, int flag)
989{
990 if (sd->parent && (sd->parent->flags & flag))
991 return 1;
992
993 return 0;
994}
029190c5 995
1b427c15 996#else /* CONFIG_SMP */
1da177e4 997
1b427c15 998struct sched_domain_attr;
d02c7a8c 999
1b427c15 1000static inline void
96f874e2 1001partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
1b427c15
IM
1002 struct sched_domain_attr *dattr_new)
1003{
d02c7a8c 1004}
1b427c15 1005#endif /* !CONFIG_SMP */
1da177e4
LT
1006
1007struct io_context; /* See blkdev.h */
1da177e4 1008
1da177e4 1009
383f2835 1010#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
36c8b586 1011extern void prefetch_stack(struct task_struct *t);
383f2835
KC
1012#else
1013static inline void prefetch_stack(struct task_struct *t) { }
1014#endif
1da177e4
LT
1015
1016struct audit_context; /* See audit.c */
1017struct mempolicy;
b92ce558 1018struct pipe_inode_info;
4865ecf1 1019struct uts_namespace;
1da177e4 1020
20b8a59f
IM
1021struct rq;
1022struct sched_domain;
1023
1024struct sched_class {
5522d5d5 1025 const struct sched_class *next;
20b8a59f 1026
fd390f6a 1027 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
f02231e5 1028 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
4530d7ab 1029 void (*yield_task) (struct rq *rq);
20b8a59f 1030
15afe09b 1031 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
20b8a59f 1032
fb8d4724 1033 struct task_struct * (*pick_next_task) (struct rq *rq);
31ee529c 1034 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
20b8a59f 1035
681f3e68 1036#ifdef CONFIG_SMP
5f3edc1b 1037 int (*select_task_rq)(struct task_struct *p, int flag, int sync);
4ce72a2c 1038
43010659 1039 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
e1d1484f 1040 struct rq *busiest, unsigned long max_load_move,
20b8a59f 1041 struct sched_domain *sd, enum cpu_idle_type idle,
a4ac01c3 1042 int *all_pinned, int *this_best_prio);
20b8a59f 1043
e1d1484f
PW
1044 int (*move_one_task) (struct rq *this_rq, int this_cpu,
1045 struct rq *busiest, struct sched_domain *sd,
1046 enum cpu_idle_type idle);
9a897c5a
SR
1047 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1048 void (*post_schedule) (struct rq *this_rq);
1049 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
e1d1484f 1050
cd8ba7cd 1051 void (*set_cpus_allowed)(struct task_struct *p,
96f874e2 1052 const struct cpumask *newmask);
57d885fe 1053
1f11eb6a
GH
1054 void (*rq_online)(struct rq *rq);
1055 void (*rq_offline)(struct rq *rq);
4ce72a2c
LZ
1056#endif
1057
1058 void (*set_curr_task) (struct rq *rq);
1059 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1060 void (*task_new) (struct rq *rq, struct task_struct *p);
cb469845
SR
1061
1062 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
1063 int running);
1064 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
1065 int running);
1066 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1067 int oldprio, int running);
810b3817
PZ
1068
1069#ifdef CONFIG_FAIR_GROUP_SCHED
1070 void (*moved_group) (struct task_struct *p);
1071#endif
20b8a59f
IM
1072};
1073
1074struct load_weight {
1075 unsigned long weight, inv_weight;
1076};
1077
1078/*
1079 * CFS stats for a schedulable entity (task, task-group etc)
1080 *
1081 * Current field usage histogram:
1082 *
1083 * 4 se->block_start
1084 * 4 se->run_node
1085 * 4 se->sleep_start
20b8a59f 1086 * 6 se->load.weight
20b8a59f
IM
1087 */
1088struct sched_entity {
20b8a59f
IM
1089 struct load_weight load; /* for load-balancing */
1090 struct rb_node run_node;
4a55bd5e 1091 struct list_head group_node;
20b8a59f
IM
1092 unsigned int on_rq;
1093
94c18227
IM
1094 u64 exec_start;
1095 u64 sum_exec_runtime;
e9acbff6 1096 u64 vruntime;
f6cf891c 1097 u64 prev_sum_exec_runtime;
94c18227 1098
4ae7d5ce
IM
1099 u64 last_wakeup;
1100 u64 avg_overlap;
1101
6c594c21
IM
1102 u64 nr_migrations;
1103
34cb6135
IM
1104 u64 start_runtime;
1105 u64 avg_wakeup;
34cb6135 1106
94c18227 1107#ifdef CONFIG_SCHEDSTATS
20b8a59f 1108 u64 wait_start;
94c18227 1109 u64 wait_max;
6d082592
AV
1110 u64 wait_count;
1111 u64 wait_sum;
8f0dfc34
AV
1112 u64 iowait_count;
1113 u64 iowait_sum;
94c18227 1114
20b8a59f 1115 u64 sleep_start;
20b8a59f 1116 u64 sleep_max;
94c18227
IM
1117 s64 sum_sleep_runtime;
1118
1119 u64 block_start;
20b8a59f
IM
1120 u64 block_max;
1121 u64 exec_max;
eba1ed4b 1122 u64 slice_max;
cc367732 1123
cc367732
IM
1124 u64 nr_migrations_cold;
1125 u64 nr_failed_migrations_affine;
1126 u64 nr_failed_migrations_running;
1127 u64 nr_failed_migrations_hot;
1128 u64 nr_forced_migrations;
1129 u64 nr_forced2_migrations;
1130
1131 u64 nr_wakeups;
1132 u64 nr_wakeups_sync;
1133 u64 nr_wakeups_migrate;
1134 u64 nr_wakeups_local;
1135 u64 nr_wakeups_remote;
1136 u64 nr_wakeups_affine;
1137 u64 nr_wakeups_affine_attempts;
1138 u64 nr_wakeups_passive;
1139 u64 nr_wakeups_idle;
94c18227
IM
1140#endif
1141
20b8a59f
IM
1142#ifdef CONFIG_FAIR_GROUP_SCHED
1143 struct sched_entity *parent;
1144 /* rq on which this entity is (to be) queued: */
1145 struct cfs_rq *cfs_rq;
1146 /* rq "owned" by this entity/group: */
1147 struct cfs_rq *my_q;
1148#endif
1149};
70b97a7f 1150
fa717060
PZ
1151struct sched_rt_entity {
1152 struct list_head run_list;
78f2c7db 1153 unsigned long timeout;
bee367ed 1154 unsigned int time_slice;
6f505b16
PZ
1155 int nr_cpus_allowed;
1156
58d6c2d7 1157 struct sched_rt_entity *back;
052f1dc7 1158#ifdef CONFIG_RT_GROUP_SCHED
6f505b16
PZ
1159 struct sched_rt_entity *parent;
1160 /* rq on which this entity is (to be) queued: */
1161 struct rt_rq *rt_rq;
1162 /* rq "owned" by this entity/group: */
1163 struct rt_rq *my_q;
1164#endif
fa717060
PZ
1165};
1166
86848966
PM
1167struct rcu_node;
1168
1da177e4
LT
1169struct task_struct {
1170 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
f7e4217b 1171 void *stack;
1da177e4 1172 atomic_t usage;
97dc32cd
WC
1173 unsigned int flags; /* per process flags, defined below */
1174 unsigned int ptrace;
1da177e4 1175
36772092 1176 int lock_depth; /* BKL lock depth */
1da177e4 1177
2dd73a4f
PW
1178#ifdef CONFIG_SMP
1179#ifdef __ARCH_WANT_UNLOCKED_CTXSW
4866cde0
NP
1180 int oncpu;
1181#endif
2dd73a4f 1182#endif
50e645a8 1183
b29739f9 1184 int prio, static_prio, normal_prio;
c7aceaba 1185 unsigned int rt_priority;
5522d5d5 1186 const struct sched_class *sched_class;
20b8a59f 1187 struct sched_entity se;
fa717060 1188 struct sched_rt_entity rt;
1da177e4 1189
e107be36
AK
1190#ifdef CONFIG_PREEMPT_NOTIFIERS
1191 /* list of struct preempt_notifier: */
1192 struct hlist_head preempt_notifiers;
1193#endif
1194
18796aa0
AD
1195 /*
1196 * fpu_counter contains the number of consecutive context switches
1197 * that the FPU is used. If this is over a threshold, the lazy fpu
1198 * saving becomes unlazy to save the trap. This is an unsigned char
1199 * so that after 256 times the counter wraps and the behavior turns
1200 * lazy again; this to deal with bursty apps that only use FPU for
1201 * a short time
1202 */
1203 unsigned char fpu_counter;
0753ba01 1204 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
6c5c9341 1205#ifdef CONFIG_BLK_DEV_IO_TRACE
2056a782 1206 unsigned int btrace_seq;
6c5c9341 1207#endif
1da177e4 1208
97dc32cd 1209 unsigned int policy;
1da177e4 1210 cpumask_t cpus_allowed;
1da177e4 1211
f41d911f 1212#ifdef CONFIG_TREE_PREEMPT_RCU
e260be67 1213 int rcu_read_lock_nesting;
f41d911f 1214 char rcu_read_unlock_special;
86848966 1215 struct rcu_node *rcu_blocked_node;
f41d911f
PM
1216 struct list_head rcu_node_entry;
1217#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
e260be67 1218
52f17b6c 1219#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1da177e4
LT
1220 struct sched_info sched_info;
1221#endif
1222
1223 struct list_head tasks;
917b627d 1224 struct plist_node pushable_tasks;
1da177e4
LT
1225
1226 struct mm_struct *mm, *active_mm;
1227
1228/* task state */
1229 struct linux_binfmt *binfmt;
97dc32cd 1230 int exit_state;
1da177e4
LT
1231 int exit_code, exit_signal;
1232 int pdeath_signal; /* The signal sent when the parent dies */
1233 /* ??? */
97dc32cd 1234 unsigned int personality;
1da177e4 1235 unsigned did_exec:1;
f9ce1f1c
KT
1236 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1237 * execve */
8f0dfc34
AV
1238 unsigned in_iowait:1;
1239
ca94c442
LP
1240
1241 /* Revert to default priority/policy when forking */
1242 unsigned sched_reset_on_fork:1;
1243
1da177e4
LT
1244 pid_t pid;
1245 pid_t tgid;
0a425405 1246
1314562a 1247#ifdef CONFIG_CC_STACKPROTECTOR
0a425405
AV
1248 /* Canary value for the -fstack-protector gcc feature */
1249 unsigned long stack_canary;
1314562a 1250#endif
e0032087 1251
1da177e4
LT
1252 /*
1253 * pointers to (original) parent process, youngest child, younger sibling,
1254 * older sibling, respectively. (p->father can be replaced with
f470021a 1255 * p->real_parent->pid)
1da177e4 1256 */
f470021a
RM
1257 struct task_struct *real_parent; /* real parent process */
1258 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1da177e4 1259 /*
f470021a 1260 * children/sibling forms the list of my natural children
1da177e4
LT
1261 */
1262 struct list_head children; /* list of my children */
1263 struct list_head sibling; /* linkage in my parent's children list */
1264 struct task_struct *group_leader; /* threadgroup leader */
1265
f470021a
RM
1266 /*
1267 * ptraced is the list of tasks this task is using ptrace on.
1268 * This includes both natural children and PTRACE_ATTACH targets.
1269 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1270 */
1271 struct list_head ptraced;
1272 struct list_head ptrace_entry;
1273
ca0002a1
MM
1274 /*
1275 * This is the tracer handle for the ptrace BTS extension.
1276 * This field actually belongs to the ptracer task.
1277 */
e2b371f0 1278 struct bts_context *bts;
ca0002a1 1279
1da177e4 1280 /* PID/PID hash table linkage. */
92476d7f 1281 struct pid_link pids[PIDTYPE_MAX];
47e65328 1282 struct list_head thread_group;
1da177e4
LT
1283
1284 struct completion *vfork_done; /* for vfork() */
1285 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1286 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1287
c66f08be 1288 cputime_t utime, stime, utimescaled, stimescaled;
9ac52315 1289 cputime_t gtime;
9301899b 1290 cputime_t prev_utime, prev_stime;
1da177e4 1291 unsigned long nvcsw, nivcsw; /* context switch counts */
924b42d5
TJ
1292 struct timespec start_time; /* monotonic time */
1293 struct timespec real_start_time; /* boot based time */
1da177e4
LT
1294/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1295 unsigned long min_flt, maj_flt;
1296
f06febc9 1297 struct task_cputime cputime_expires;
1da177e4
LT
1298 struct list_head cpu_timers[3];
1299
1300/* process credentials */
3b11a1de
DH
1301 const struct cred *real_cred; /* objective and real subjective task
1302 * credentials (COW) */
1303 const struct cred *cred; /* effective (overridable) subjective task
1304 * credentials (COW) */
5e751e99
DH
1305 struct mutex cred_guard_mutex; /* guard against foreign influences on
1306 * credential calculations
1307 * (notably. ptrace) */
ee18d64c 1308 struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
b6dff3ec 1309
36772092
PBG
1310 char comm[TASK_COMM_LEN]; /* executable name excluding path
1311 - access with [gs]et_task_comm (which lock
1312 it with task_lock())
1313 - initialized normally by flush_old_exec */
1da177e4
LT
1314/* file system info */
1315 int link_count, total_link_count;
3d5b6fcc 1316#ifdef CONFIG_SYSVIPC
1da177e4
LT
1317/* ipc stuff */
1318 struct sysv_sem sysvsem;
3d5b6fcc 1319#endif
e162b39a 1320#ifdef CONFIG_DETECT_HUNG_TASK
82a1fcb9 1321/* hung task detection */
82a1fcb9
IM
1322 unsigned long last_switch_count;
1323#endif
1da177e4
LT
1324/* CPU-specific state of this task */
1325 struct thread_struct thread;
1326/* filesystem information */
1327 struct fs_struct *fs;
1328/* open file information */
1329 struct files_struct *files;
1651e14e 1330/* namespaces */
ab516013 1331 struct nsproxy *nsproxy;
1da177e4
LT
1332/* signal handlers */
1333 struct signal_struct *signal;
1334 struct sighand_struct *sighand;
1335
1336 sigset_t blocked, real_blocked;
f3de272b 1337 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1da177e4
LT
1338 struct sigpending pending;
1339
1340 unsigned long sas_ss_sp;
1341 size_t sas_ss_size;
1342 int (*notifier)(void *priv);
1343 void *notifier_data;
1344 sigset_t *notifier_mask;
1da177e4 1345 struct audit_context *audit_context;
bfef93a5
AV
1346#ifdef CONFIG_AUDITSYSCALL
1347 uid_t loginuid;
4746ec5b 1348 unsigned int sessionid;
bfef93a5 1349#endif
1da177e4
LT
1350 seccomp_t seccomp;
1351
1352/* Thread group tracking */
1353 u32 parent_exec_id;
1354 u32 self_exec_id;
58568d2a
MX
1355/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1356 * mempolicy */
1da177e4 1357 spinlock_t alloc_lock;
1da177e4 1358
3aa551c9
TG
1359#ifdef CONFIG_GENERIC_HARDIRQS
1360 /* IRQ handler threads */
1361 struct irqaction *irqaction;
1362#endif
1363
b29739f9
IM
1364 /* Protection of the PI data structures: */
1365 spinlock_t pi_lock;
1366
23f78d4a
IM
1367#ifdef CONFIG_RT_MUTEXES
1368 /* PI waiters blocked on a rt_mutex held by this task */
1369 struct plist_head pi_waiters;
1370 /* Deadlock detection and priority inheritance handling */
1371 struct rt_mutex_waiter *pi_blocked_on;
23f78d4a
IM
1372#endif
1373
408894ee
IM
1374#ifdef CONFIG_DEBUG_MUTEXES
1375 /* mutex deadlock detection */
1376 struct mutex_waiter *blocked_on;
1377#endif
de30a2b3
IM
1378#ifdef CONFIG_TRACE_IRQFLAGS
1379 unsigned int irq_events;
1380 int hardirqs_enabled;
1381 unsigned long hardirq_enable_ip;
1382 unsigned int hardirq_enable_event;
1383 unsigned long hardirq_disable_ip;
1384 unsigned int hardirq_disable_event;
1385 int softirqs_enabled;
1386 unsigned long softirq_disable_ip;
1387 unsigned int softirq_disable_event;
1388 unsigned long softirq_enable_ip;
1389 unsigned int softirq_enable_event;
1390 int hardirq_context;
1391 int softirq_context;
1392#endif
fbb9ce95 1393#ifdef CONFIG_LOCKDEP
bdb9441e 1394# define MAX_LOCK_DEPTH 48UL
fbb9ce95
IM
1395 u64 curr_chain_key;
1396 int lockdep_depth;
fbb9ce95 1397 unsigned int lockdep_recursion;
c7aceaba 1398 struct held_lock held_locks[MAX_LOCK_DEPTH];
cf40bd16 1399 gfp_t lockdep_reclaim_gfp;
fbb9ce95 1400#endif
408894ee 1401
1da177e4
LT
1402/* journalling filesystem info */
1403 void *journal_info;
1404
d89d8796
NB
1405/* stacked block device info */
1406 struct bio *bio_list, **bio_tail;
1407
1da177e4
LT
1408/* VM state */
1409 struct reclaim_state *reclaim_state;
1410
1da177e4
LT
1411 struct backing_dev_info *backing_dev_info;
1412
1413 struct io_context *io_context;
1414
1415 unsigned long ptrace_message;
1416 siginfo_t *last_siginfo; /* For ptrace use. */
7c3ab738 1417 struct task_io_accounting ioac;
8f0ab514 1418#if defined(CONFIG_TASK_XACCT)
1da177e4
LT
1419 u64 acct_rss_mem1; /* accumulated rss usage */
1420 u64 acct_vm_mem1; /* accumulated virtual memory usage */
49b5cf34 1421 cputime_t acct_timexpd; /* stime + utime since last update */
1da177e4
LT
1422#endif
1423#ifdef CONFIG_CPUSETS
58568d2a 1424 nodemask_t mems_allowed; /* Protected by alloc_lock */
825a46af 1425 int cpuset_mem_spread_rotor;
1da177e4 1426#endif
ddbcc7e8 1427#ifdef CONFIG_CGROUPS
817929ec
PM
1428 /* Control Group info protected by css_set_lock */
1429 struct css_set *cgroups;
1430 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1431 struct list_head cg_list;
ddbcc7e8 1432#endif
42b2dd0a 1433#ifdef CONFIG_FUTEX
0771dfef 1434 struct robust_list_head __user *robust_list;
34f192c6
IM
1435#ifdef CONFIG_COMPAT
1436 struct compat_robust_list_head __user *compat_robust_list;
1437#endif
c87e2837
IM
1438 struct list_head pi_state_list;
1439 struct futex_pi_state *pi_state_cache;
c7aceaba 1440#endif
a63eaf34
PM
1441#ifdef CONFIG_PERF_COUNTERS
1442 struct perf_counter_context *perf_counter_ctxp;
082ff5a2
PZ
1443 struct mutex perf_counter_mutex;
1444 struct list_head perf_counter_list;
a63eaf34 1445#endif
c7aceaba 1446#ifdef CONFIG_NUMA
58568d2a 1447 struct mempolicy *mempolicy; /* Protected by alloc_lock */
c7aceaba 1448 short il_next;
42b2dd0a 1449#endif
22e2c507 1450 atomic_t fs_excl; /* holding fs exclusive resources */
e56d0903 1451 struct rcu_head rcu;
b92ce558
JA
1452
1453 /*
1454 * cache last used pipe for splice
1455 */
1456 struct pipe_inode_info *splice_pipe;
ca74e92b
SN
1457#ifdef CONFIG_TASK_DELAY_ACCT
1458 struct task_delay_info *delays;
f4f154fd
AM
1459#endif
1460#ifdef CONFIG_FAULT_INJECTION
1461 int make_it_fail;
ca74e92b 1462#endif
3e26c149 1463 struct prop_local_single dirties;
9745512c
AV
1464#ifdef CONFIG_LATENCYTOP
1465 int latency_record_count;
1466 struct latency_record latency_record[LT_SAVECOUNT];
1467#endif
6976675d
AV
1468 /*
1469 * time slack values; these are used to round up poll() and
1470 * select() etc timeout values. These are in nanoseconds.
1471 */
1472 unsigned long timer_slack_ns;
1473 unsigned long default_timer_slack_ns;
f8d570a4
DM
1474
1475 struct list_head *scm_work_list;
fb52607a 1476#ifdef CONFIG_FUNCTION_GRAPH_TRACER
f201ae23
FW
1477 /* Index of current stored adress in ret_stack */
1478 int curr_ret_stack;
1479 /* Stack of return addresses for return function tracing */
1480 struct ftrace_ret_stack *ret_stack;
8aef2d28
SR
1481 /* time stamp for last schedule */
1482 unsigned long long ftrace_timestamp;
f201ae23
FW
1483 /*
1484 * Number of functions that haven't been traced
1485 * because of depth overrun.
1486 */
1487 atomic_t trace_overrun;
380c4b14
FW
1488 /* Pause for the tracing */
1489 atomic_t tracing_graph_pause;
f201ae23 1490#endif
ea4e2bc4
SR
1491#ifdef CONFIG_TRACING
1492 /* state flags for use by tracers */
1493 unsigned long trace;
261842b7
SR
1494 /* bitmask of trace recursion */
1495 unsigned long trace_recursion;
1496#endif /* CONFIG_TRACING */
1da177e4
LT
1497};
1498
76e6eee0
RR
1499/* Future-safe accessor for struct task_struct's cpus_allowed. */
1500#define tsk_cpumask(tsk) (&(tsk)->cpus_allowed)
1501
e05606d3
IM
1502/*
1503 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1504 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1505 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1506 * values are inverted: lower p->prio value means higher priority.
1507 *
1508 * The MAX_USER_RT_PRIO value allows the actual maximum
1509 * RT priority to be separate from the value exported to
1510 * user-space. This allows kernel threads to set their
1511 * priority to a value higher than any user task. Note:
1512 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1513 */
1514
1515#define MAX_USER_RT_PRIO 100
1516#define MAX_RT_PRIO MAX_USER_RT_PRIO
1517
1518#define MAX_PRIO (MAX_RT_PRIO + 40)
1519#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1520
1521static inline int rt_prio(int prio)
1522{
1523 if (unlikely(prio < MAX_RT_PRIO))
1524 return 1;
1525 return 0;
1526}
1527
e868171a 1528static inline int rt_task(struct task_struct *p)
e05606d3
IM
1529{
1530 return rt_prio(p->prio);
1531}
1532
e868171a 1533static inline struct pid *task_pid(struct task_struct *task)
22c935f4
EB
1534{
1535 return task->pids[PIDTYPE_PID].pid;
1536}
1537
e868171a 1538static inline struct pid *task_tgid(struct task_struct *task)
22c935f4
EB
1539{
1540 return task->group_leader->pids[PIDTYPE_PID].pid;
1541}
1542
6dda81f4
ON
1543/*
1544 * Without tasklist or rcu lock it is not safe to dereference
1545 * the result of task_pgrp/task_session even if task == current,
1546 * we can race with another thread doing sys_setsid/sys_setpgid.
1547 */
e868171a 1548static inline struct pid *task_pgrp(struct task_struct *task)
22c935f4
EB
1549{
1550 return task->group_leader->pids[PIDTYPE_PGID].pid;
1551}
1552
e868171a 1553static inline struct pid *task_session(struct task_struct *task)
22c935f4
EB
1554{
1555 return task->group_leader->pids[PIDTYPE_SID].pid;
1556}
1557
7af57294
PE
1558struct pid_namespace;
1559
1560/*
1561 * the helpers to get the task's different pids as they are seen
1562 * from various namespaces
1563 *
1564 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
44c4e1b2
EB
1565 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1566 * current.
7af57294
PE
1567 * task_xid_nr_ns() : id seen from the ns specified;
1568 *
1569 * set_task_vxid() : assigns a virtual id to a task;
1570 *
7af57294
PE
1571 * see also pid_nr() etc in include/linux/pid.h
1572 */
52ee2dfd
ON
1573pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1574 struct pid_namespace *ns);
7af57294 1575
e868171a 1576static inline pid_t task_pid_nr(struct task_struct *tsk)
7af57294
PE
1577{
1578 return tsk->pid;
1579}
1580
52ee2dfd
ON
1581static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1582 struct pid_namespace *ns)
1583{
1584 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1585}
7af57294
PE
1586
1587static inline pid_t task_pid_vnr(struct task_struct *tsk)
1588{
52ee2dfd 1589 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
7af57294
PE
1590}
1591
1592
e868171a 1593static inline pid_t task_tgid_nr(struct task_struct *tsk)
7af57294
PE
1594{
1595 return tsk->tgid;
1596}
1597
2f2a3a46 1598pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
7af57294
PE
1599
1600static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1601{
1602 return pid_vnr(task_tgid(tsk));
1603}
1604
1605
52ee2dfd
ON
1606static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1607 struct pid_namespace *ns)
7af57294 1608{
52ee2dfd 1609 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
7af57294
PE
1610}
1611
7af57294
PE
1612static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1613{
52ee2dfd 1614 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
7af57294
PE
1615}
1616
1617
52ee2dfd
ON
1618static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1619 struct pid_namespace *ns)
7af57294 1620{
52ee2dfd 1621 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
7af57294
PE
1622}
1623
7af57294
PE
1624static inline pid_t task_session_vnr(struct task_struct *tsk)
1625{
52ee2dfd 1626 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
7af57294
PE
1627}
1628
1b0f7ffd
ON
1629/* obsolete, do not use */
1630static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1631{
1632 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1633}
7af57294 1634
1da177e4
LT
1635/**
1636 * pid_alive - check that a task structure is not stale
1637 * @p: Task structure to be checked.
1638 *
1639 * Test if a process is not yet dead (at most zombie state)
1640 * If pid_alive fails, then pointers within the task structure
1641 * can be stale and must not be dereferenced.
1642 */
e868171a 1643static inline int pid_alive(struct task_struct *p)
1da177e4 1644{
92476d7f 1645 return p->pids[PIDTYPE_PID].pid != NULL;
1da177e4
LT
1646}
1647
f400e198 1648/**
b460cbc5 1649 * is_global_init - check if a task structure is init
3260259f
HK
1650 * @tsk: Task structure to be checked.
1651 *
1652 * Check if a task structure is the first user space task the kernel created.
b460cbc5 1653 */
e868171a 1654static inline int is_global_init(struct task_struct *tsk)
b461cc03
PE
1655{
1656 return tsk->pid == 1;
1657}
b460cbc5
SH
1658
1659/*
1660 * is_container_init:
1661 * check whether in the task is init in its own pid namespace.
f400e198 1662 */
b461cc03 1663extern int is_container_init(struct task_struct *tsk);
f400e198 1664
9ec52099
CLG
1665extern struct pid *cad_pid;
1666
1da177e4 1667extern void free_task(struct task_struct *tsk);
1da177e4 1668#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
e56d0903 1669
158d9ebd 1670extern void __put_task_struct(struct task_struct *t);
e56d0903
IM
1671
1672static inline void put_task_struct(struct task_struct *t)
1673{
1674 if (atomic_dec_and_test(&t->usage))
8c7904a0 1675 __put_task_struct(t);
e56d0903 1676}
1da177e4 1677
49048622
BS
1678extern cputime_t task_utime(struct task_struct *p);
1679extern cputime_t task_stime(struct task_struct *p);
1680extern cputime_t task_gtime(struct task_struct *p);
1681
1da177e4
LT
1682/*
1683 * Per process flags
1684 */
1685#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1686 /* Not implemented yet, only for 486*/
1687#define PF_STARTING 0x00000002 /* being created */
1688#define PF_EXITING 0x00000004 /* getting shut down */
778e9a9c 1689#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
94886b84 1690#define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1da177e4
LT
1691#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1692#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1693#define PF_DUMPCORE 0x00000200 /* dumped core */
1694#define PF_SIGNALED 0x00000400 /* killed by a signal */
1695#define PF_MEMALLOC 0x00000800 /* Allocating memory */
1696#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1697#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
6301cb95 1698#define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */
1da177e4
LT
1699#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1700#define PF_FROZEN 0x00010000 /* frozen for system suspend */
1701#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1702#define PF_KSWAPD 0x00040000 /* I am kswapd */
1703#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1704#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
246bb0b1 1705#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
b31dc66a
JA
1706#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1707#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1708#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1709#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
9985b0ba 1710#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
c61afb18 1711#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
61a87122 1712#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
ba96a0c8 1713#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
ebb12db5 1714#define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1da177e4
LT
1715
1716/*
1717 * Only the _current_ task can read/write to tsk->flags, but other
1718 * tasks can access tsk->flags in readonly mode for example
1719 * with tsk_used_math (like during threaded core dumping).
1720 * There is however an exception to this rule during ptrace
1721 * or during fork: the ptracer task is allowed to write to the
1722 * child->flags of its traced child (same goes for fork, the parent
1723 * can write to the child->flags), because we're guaranteed the
1724 * child is not running and in turn not changing child->flags
1725 * at the same time the parent does it.
1726 */
1727#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1728#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1729#define clear_used_math() clear_stopped_child_used_math(current)
1730#define set_used_math() set_stopped_child_used_math(current)
1731#define conditional_stopped_child_used_math(condition, child) \
1732 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1733#define conditional_used_math(condition) \
1734 conditional_stopped_child_used_math(condition, current)
1735#define copy_to_stopped_child_used_math(child) \
1736 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1737/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1738#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1739#define used_math() tsk_used_math(current)
1740
f41d911f
PM
1741#ifdef CONFIG_TREE_PREEMPT_RCU
1742
1743#define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1744#define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1745#define RCU_READ_UNLOCK_GOT_QS (1 << 2) /* CPU has responded to RCU core. */
1746
1747static inline void rcu_copy_process(struct task_struct *p)
1748{
1749 p->rcu_read_lock_nesting = 0;
1750 p->rcu_read_unlock_special = 0;
dd5d19ba 1751 p->rcu_blocked_node = NULL;
f41d911f
PM
1752 INIT_LIST_HEAD(&p->rcu_node_entry);
1753}
1754
f41d911f
PM
1755#else
1756
1757static inline void rcu_copy_process(struct task_struct *p)
1758{
1759}
1760
1761#endif
1762
1da177e4 1763#ifdef CONFIG_SMP
cd8ba7cd 1764extern int set_cpus_allowed_ptr(struct task_struct *p,
96f874e2 1765 const struct cpumask *new_mask);
1da177e4 1766#else
cd8ba7cd 1767static inline int set_cpus_allowed_ptr(struct task_struct *p,
96f874e2 1768 const struct cpumask *new_mask)
1da177e4 1769{
96f874e2 1770 if (!cpumask_test_cpu(0, new_mask))
1da177e4
LT
1771 return -EINVAL;
1772 return 0;
1773}
1774#endif
cd8ba7cd
MT
1775static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1776{
1777 return set_cpus_allowed_ptr(p, &new_mask);
1778}
1da177e4 1779
b342501c
IM
1780/*
1781 * Architectures can set this to 1 if they have specified
1782 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1783 * but then during bootup it turns out that sched_clock()
1784 * is reliable after all:
1785 */
1786#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1787extern int sched_clock_stable;
1788#endif
1789
1da177e4 1790extern unsigned long long sched_clock(void);
e436d800 1791
c1955a3d
PZ
1792extern void sched_clock_init(void);
1793extern u64 sched_clock_cpu(int cpu);
3e51f33f 1794
c1955a3d 1795#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
3e51f33f
PZ
1796static inline void sched_clock_tick(void)
1797{
1798}
1799
1800static inline void sched_clock_idle_sleep_event(void)
1801{
1802}
1803
1804static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1805{
1806}
1807#else
3e51f33f
PZ
1808extern void sched_clock_tick(void);
1809extern void sched_clock_idle_sleep_event(void);
1810extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1811#endif
1812
e436d800
IM
1813/*
1814 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1815 * clock constructed from sched_clock():
1816 */
1817extern unsigned long long cpu_clock(int cpu);
1818
36c8b586 1819extern unsigned long long
41b86e9c 1820task_sched_runtime(struct task_struct *task);
f06febc9 1821extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1da177e4
LT
1822
1823/* sched_exec is called by processes performing an exec */
1824#ifdef CONFIG_SMP
1825extern void sched_exec(void);
1826#else
1827#define sched_exec() {}
1828#endif
1829
2aa44d05
IM
1830extern void sched_clock_idle_sleep_event(void);
1831extern void sched_clock_idle_wakeup_event(u64 delta_ns);
bb29ab26 1832
1da177e4
LT
1833#ifdef CONFIG_HOTPLUG_CPU
1834extern void idle_task_exit(void);
1835#else
1836static inline void idle_task_exit(void) {}
1837#endif
1838
1839extern void sched_idle_next(void);
b29739f9 1840
06d8308c
TG
1841#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1842extern void wake_up_idle_cpu(int cpu);
1843#else
1844static inline void wake_up_idle_cpu(int cpu) { }
1845#endif
1846
21805085 1847extern unsigned int sysctl_sched_latency;
b2be5e96 1848extern unsigned int sysctl_sched_min_granularity;
bf0f6f24 1849extern unsigned int sysctl_sched_wakeup_granularity;
47fea2ad
JSR
1850extern unsigned int sysctl_sched_shares_ratelimit;
1851extern unsigned int sysctl_sched_shares_thresh;
bf0f6f24 1852extern unsigned int sysctl_sched_child_runs_first;
2bba22c5 1853#ifdef CONFIG_SCHED_DEBUG
bf0f6f24 1854extern unsigned int sysctl_sched_features;
da84d961 1855extern unsigned int sysctl_sched_migration_cost;
b82d9fdd 1856extern unsigned int sysctl_sched_nr_migrate;
e9e9250b 1857extern unsigned int sysctl_sched_time_avg;
cd1bb94b 1858extern unsigned int sysctl_timer_migration;
b2be5e96
PZ
1859
1860int sched_nr_latency_handler(struct ctl_table *table, int write,
1861 struct file *file, void __user *buffer, size_t *length,
1862 loff_t *ppos);
2bd8e6d4 1863#endif
eea08f32
AB
1864#ifdef CONFIG_SCHED_DEBUG
1865static inline unsigned int get_sysctl_timer_migration(void)
1866{
1867 return sysctl_timer_migration;
1868}
1869#else
1870static inline unsigned int get_sysctl_timer_migration(void)
1871{
1872 return 1;
1873}
1874#endif
9f0c1e56
PZ
1875extern unsigned int sysctl_sched_rt_period;
1876extern int sysctl_sched_rt_runtime;
2bd8e6d4 1877
d0b27fa7
PZ
1878int sched_rt_handler(struct ctl_table *table, int write,
1879 struct file *filp, void __user *buffer, size_t *lenp,
1880 loff_t *ppos);
1881
2bd8e6d4 1882extern unsigned int sysctl_sched_compat_yield;
bf0f6f24 1883
b29739f9 1884#ifdef CONFIG_RT_MUTEXES
36c8b586
IM
1885extern int rt_mutex_getprio(struct task_struct *p);
1886extern void rt_mutex_setprio(struct task_struct *p, int prio);
1887extern void rt_mutex_adjust_pi(struct task_struct *p);
b29739f9 1888#else
e868171a 1889static inline int rt_mutex_getprio(struct task_struct *p)
b29739f9
IM
1890{
1891 return p->normal_prio;
1892}
95e02ca9 1893# define rt_mutex_adjust_pi(p) do { } while (0)
b29739f9
IM
1894#endif
1895
36c8b586
IM
1896extern void set_user_nice(struct task_struct *p, long nice);
1897extern int task_prio(const struct task_struct *p);
1898extern int task_nice(const struct task_struct *p);
1899extern int can_nice(const struct task_struct *p, const int nice);
1900extern int task_curr(const struct task_struct *p);
1da177e4
LT
1901extern int idle_cpu(int cpu);
1902extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
961ccddd
RR
1903extern int sched_setscheduler_nocheck(struct task_struct *, int,
1904 struct sched_param *);
36c8b586
IM
1905extern struct task_struct *idle_task(int cpu);
1906extern struct task_struct *curr_task(int cpu);
1907extern void set_curr_task(int cpu, struct task_struct *p);
1da177e4
LT
1908
1909void yield(void);
1910
1911/*
1912 * The default (Linux) execution domain.
1913 */
1914extern struct exec_domain default_exec_domain;
1915
1916union thread_union {
1917 struct thread_info thread_info;
1918 unsigned long stack[THREAD_SIZE/sizeof(long)];
1919};
1920
1921#ifndef __HAVE_ARCH_KSTACK_END
1922static inline int kstack_end(void *addr)
1923{
1924 /* Reliable end of stack detection:
1925 * Some APM bios versions misalign the stack
1926 */
1927 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1928}
1929#endif
1930
1931extern union thread_union init_thread_union;
1932extern struct task_struct init_task;
1933
1934extern struct mm_struct init_mm;
1935
198fe21b
PE
1936extern struct pid_namespace init_pid_ns;
1937
1938/*
1939 * find a task by one of its numerical ids
1940 *
198fe21b
PE
1941 * find_task_by_pid_ns():
1942 * finds a task by its pid in the specified namespace
228ebcbe
PE
1943 * find_task_by_vpid():
1944 * finds a task by its virtual pid
198fe21b 1945 *
e49859e7 1946 * see also find_vpid() etc in include/linux/pid.h
198fe21b
PE
1947 */
1948
228ebcbe
PE
1949extern struct task_struct *find_task_by_vpid(pid_t nr);
1950extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1951 struct pid_namespace *ns);
198fe21b 1952
8520d7c7 1953extern void __set_special_pids(struct pid *pid);
1da177e4
LT
1954
1955/* per-UID process charging. */
acce292c 1956extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1da177e4
LT
1957static inline struct user_struct *get_uid(struct user_struct *u)
1958{
1959 atomic_inc(&u->__count);
1960 return u;
1961}
1962extern void free_uid(struct user_struct *);
28f300d2 1963extern void release_uids(struct user_namespace *ns);
1da177e4
LT
1964
1965#include <asm/current.h>
1966
3171a030 1967extern void do_timer(unsigned long ticks);
1da177e4 1968
b3c97528
HH
1969extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1970extern int wake_up_process(struct task_struct *tsk);
1971extern void wake_up_new_task(struct task_struct *tsk,
1972 unsigned long clone_flags);
1da177e4
LT
1973#ifdef CONFIG_SMP
1974 extern void kick_process(struct task_struct *tsk);
1975#else
1976 static inline void kick_process(struct task_struct *tsk) { }
1977#endif
ad46c2c4
IM
1978extern void sched_fork(struct task_struct *p, int clone_flags);
1979extern void sched_dead(struct task_struct *p);
1da177e4 1980
1da177e4
LT
1981extern void proc_caches_init(void);
1982extern void flush_signals(struct task_struct *);
3bcac026 1983extern void __flush_signals(struct task_struct *);
10ab825b 1984extern void ignore_signals(struct task_struct *);
1da177e4
LT
1985extern void flush_signal_handlers(struct task_struct *, int force_default);
1986extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1987
1988static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1989{
1990 unsigned long flags;
1991 int ret;
1992
1993 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1994 ret = dequeue_signal(tsk, mask, info);
1995 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1996
1997 return ret;
1998}
1999
2000extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2001 sigset_t *mask);
2002extern void unblock_all_signals(void);
2003extern void release_task(struct task_struct * p);
2004extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1da177e4
LT
2005extern int force_sigsegv(int, struct task_struct *);
2006extern int force_sig_info(int, struct siginfo *, struct task_struct *);
c4b92fc1 2007extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
c4b92fc1 2008extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2425c08b 2009extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
c4b92fc1
EB
2010extern int kill_pgrp(struct pid *pid, int sig, int priv);
2011extern int kill_pid(struct pid *pid, int sig, int priv);
c3de4b38 2012extern int kill_proc_info(int, struct siginfo *, pid_t);
2b2a1ff6 2013extern int do_notify_parent(struct task_struct *, int);
1da177e4
LT
2014extern void force_sig(int, struct task_struct *);
2015extern void force_sig_specific(int, struct task_struct *);
2016extern int send_sig(int, struct task_struct *, int);
2017extern void zap_other_threads(struct task_struct *p);
1da177e4
LT
2018extern struct sigqueue *sigqueue_alloc(void);
2019extern void sigqueue_free(struct sigqueue *);
ac5c2153 2020extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
9ac95f2f 2021extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1da177e4
LT
2022extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
2023
9ec52099
CLG
2024static inline int kill_cad_pid(int sig, int priv)
2025{
2026 return kill_pid(cad_pid, sig, priv);
2027}
2028
1da177e4
LT
2029/* These can be the second arg to send_sig_info/send_group_sig_info. */
2030#define SEND_SIG_NOINFO ((struct siginfo *) 0)
2031#define SEND_SIG_PRIV ((struct siginfo *) 1)
2032#define SEND_SIG_FORCED ((struct siginfo *) 2)
2033
621d3121
ON
2034static inline int is_si_special(const struct siginfo *info)
2035{
2036 return info <= SEND_SIG_FORCED;
2037}
2038
1da177e4
LT
2039/* True if we are on the alternate signal stack. */
2040
2041static inline int on_sig_stack(unsigned long sp)
2042{
2043 return (sp - current->sas_ss_sp < current->sas_ss_size);
2044}
2045
2046static inline int sas_ss_flags(unsigned long sp)
2047{
2048 return (current->sas_ss_size == 0 ? SS_DISABLE
2049 : on_sig_stack(sp) ? SS_ONSTACK : 0);
2050}
2051
1da177e4
LT
2052/*
2053 * Routines for handling mm_structs
2054 */
2055extern struct mm_struct * mm_alloc(void);
2056
2057/* mmdrop drops the mm and the page tables */
b3c97528 2058extern void __mmdrop(struct mm_struct *);
1da177e4
LT
2059static inline void mmdrop(struct mm_struct * mm)
2060{
6fb43d7b 2061 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1da177e4
LT
2062 __mmdrop(mm);
2063}
2064
2065/* mmput gets rid of the mappings and all user-space */
2066extern void mmput(struct mm_struct *);
2067/* Grab a reference to a task's mm, if it is not already going away */
2068extern struct mm_struct *get_task_mm(struct task_struct *task);
2069/* Remove the current tasks stale references to the old mm_struct */
2070extern void mm_release(struct task_struct *, struct mm_struct *);
402b0862
CO
2071/* Allocate a new mm structure and copy contents from tsk->mm */
2072extern struct mm_struct *dup_mm(struct task_struct *tsk);
1da177e4 2073
6f2c55b8
AD
2074extern int copy_thread(unsigned long, unsigned long, unsigned long,
2075 struct task_struct *, struct pt_regs *);
1da177e4
LT
2076extern void flush_thread(void);
2077extern void exit_thread(void);
2078
1da177e4 2079extern void exit_files(struct task_struct *);
6b3934ef 2080extern void __cleanup_signal(struct signal_struct *);
a7e5328a 2081extern void __cleanup_sighand(struct sighand_struct *);
cbaffba1 2082
1da177e4 2083extern void exit_itimers(struct signal_struct *);
cbaffba1 2084extern void flush_itimer_signals(void);
1da177e4
LT
2085
2086extern NORET_TYPE void do_group_exit(int);
2087
1da177e4
LT
2088extern void daemonize(const char *, ...);
2089extern int allow_signal(int);
2090extern int disallow_signal(int);
1da177e4
LT
2091
2092extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
2093extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
36c8b586 2094struct task_struct *fork_idle(int);
1da177e4
LT
2095
2096extern void set_task_comm(struct task_struct *tsk, char *from);
59714d65 2097extern char *get_task_comm(char *to, struct task_struct *tsk);
1da177e4
LT
2098
2099#ifdef CONFIG_SMP
a26b89f0 2100extern void wait_task_context_switch(struct task_struct *p);
85ba2d86 2101extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
1da177e4 2102#else
a26b89f0 2103static inline void wait_task_context_switch(struct task_struct *p) {}
85ba2d86
RM
2104static inline unsigned long wait_task_inactive(struct task_struct *p,
2105 long match_state)
2106{
2107 return 1;
2108}
1da177e4
LT
2109#endif
2110
05725f7e
JP
2111#define next_task(p) \
2112 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
1da177e4
LT
2113
2114#define for_each_process(p) \
2115 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2116
5bb459bb 2117extern bool current_is_single_threaded(void);
d84f4f99 2118
1da177e4
LT
2119/*
2120 * Careful: do_each_thread/while_each_thread is a double loop so
2121 * 'break' will not work as expected - use goto instead.
2122 */
2123#define do_each_thread(g, t) \
2124 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2125
2126#define while_each_thread(g, t) \
2127 while ((t = next_thread(t)) != g)
2128
de12a787
EB
2129/* de_thread depends on thread_group_leader not being a pid based check */
2130#define thread_group_leader(p) (p == p->group_leader)
1da177e4 2131
0804ef4b
EB
2132/* Do to the insanities of de_thread it is possible for a process
2133 * to have the pid of the thread group leader without actually being
2134 * the thread group leader. For iteration through the pids in proc
2135 * all we care about is that we have a task with the appropriate
2136 * pid, we don't actually care if we have the right task.
2137 */
e868171a 2138static inline int has_group_leader_pid(struct task_struct *p)
0804ef4b
EB
2139{
2140 return p->pid == p->tgid;
2141}
2142
bac0abd6
PE
2143static inline
2144int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2145{
2146 return p1->tgid == p2->tgid;
2147}
2148
36c8b586 2149static inline struct task_struct *next_thread(const struct task_struct *p)
47e65328 2150{
05725f7e
JP
2151 return list_entry_rcu(p->thread_group.next,
2152 struct task_struct, thread_group);
47e65328
ON
2153}
2154
e868171a 2155static inline int thread_group_empty(struct task_struct *p)
1da177e4 2156{
47e65328 2157 return list_empty(&p->thread_group);
1da177e4
LT
2158}
2159
2160#define delay_group_leader(p) \
2161 (thread_group_leader(p) && !thread_group_empty(p))
2162
39c626ae
ON
2163static inline int task_detached(struct task_struct *p)
2164{
2165 return p->exit_signal == -1;
2166}
2167
1da177e4 2168/*
260ea101 2169 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
22e2c507 2170 * subscriptions and synchronises with wait4(). Also used in procfs. Also
ddbcc7e8
PM
2171 * pins the final release of task.io_context. Also protects ->cpuset and
2172 * ->cgroup.subsys[].
1da177e4
LT
2173 *
2174 * Nests both inside and outside of read_lock(&tasklist_lock).
2175 * It must not be nested with write_lock_irq(&tasklist_lock),
2176 * neither inside nor outside.
2177 */
2178static inline void task_lock(struct task_struct *p)
2179{
2180 spin_lock(&p->alloc_lock);
2181}
2182
2183static inline void task_unlock(struct task_struct *p)
2184{
2185 spin_unlock(&p->alloc_lock);
2186}
2187
f63ee72e
ON
2188extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2189 unsigned long *flags);
2190
2191static inline void unlock_task_sighand(struct task_struct *tsk,
2192 unsigned long *flags)
2193{
2194 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2195}
2196
f037360f
AV
2197#ifndef __HAVE_THREAD_FUNCTIONS
2198
f7e4217b
RZ
2199#define task_thread_info(task) ((struct thread_info *)(task)->stack)
2200#define task_stack_page(task) ((task)->stack)
a1261f54 2201
10ebffde
AV
2202static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2203{
2204 *task_thread_info(p) = *task_thread_info(org);
2205 task_thread_info(p)->task = p;
2206}
2207
2208static inline unsigned long *end_of_stack(struct task_struct *p)
2209{
f7e4217b 2210 return (unsigned long *)(task_thread_info(p) + 1);
10ebffde
AV
2211}
2212
f037360f
AV
2213#endif
2214
8b05c7e6
FT
2215static inline int object_is_on_stack(void *obj)
2216{
2217 void *stack = task_stack_page(current);
2218
2219 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2220}
2221
8c9843e5
BH
2222extern void thread_info_cache_init(void);
2223
7c9f8861
ES
2224#ifdef CONFIG_DEBUG_STACK_USAGE
2225static inline unsigned long stack_not_used(struct task_struct *p)
2226{
2227 unsigned long *n = end_of_stack(p);
2228
2229 do { /* Skip over canary */
2230 n++;
2231 } while (!*n);
2232
2233 return (unsigned long)n - (unsigned long)end_of_stack(p);
2234}
2235#endif
2236
1da177e4
LT
2237/* set thread flags in other task's structures
2238 * - see asm/thread_info.h for TIF_xxxx flags available
2239 */
2240static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2241{
a1261f54 2242 set_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT
2243}
2244
2245static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2246{
a1261f54 2247 clear_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT
2248}
2249
2250static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2251{
a1261f54 2252 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT
2253}
2254
2255static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2256{
a1261f54 2257 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT
2258}
2259
2260static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2261{
a1261f54 2262 return test_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT
2263}
2264
2265static inline void set_tsk_need_resched(struct task_struct *tsk)
2266{
2267 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2268}
2269
2270static inline void clear_tsk_need_resched(struct task_struct *tsk)
2271{
2272 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2273}
2274
8ae121ac
GH
2275static inline int test_tsk_need_resched(struct task_struct *tsk)
2276{
2277 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2278}
2279
690cc3ff
EB
2280static inline int restart_syscall(void)
2281{
2282 set_tsk_thread_flag(current, TIF_SIGPENDING);
2283 return -ERESTARTNOINTR;
2284}
2285
1da177e4
LT
2286static inline int signal_pending(struct task_struct *p)
2287{
2288 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2289}
f776d12d 2290
b3c97528 2291extern int __fatal_signal_pending(struct task_struct *p);
f776d12d
MW
2292
2293static inline int fatal_signal_pending(struct task_struct *p)
2294{
2295 return signal_pending(p) && __fatal_signal_pending(p);
2296}
2297
16882c1e
ON
2298static inline int signal_pending_state(long state, struct task_struct *p)
2299{
2300 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2301 return 0;
2302 if (!signal_pending(p))
2303 return 0;
2304
16882c1e
ON
2305 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2306}
2307
1da177e4
LT
2308static inline int need_resched(void)
2309{
9404ef02 2310 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1da177e4
LT
2311}
2312
2313/*
2314 * cond_resched() and cond_resched_lock(): latency reduction via
2315 * explicit rescheduling in places that are safe. The return
2316 * value indicates whether a reschedule was done in fact.
2317 * cond_resched_lock() will drop the spinlock before scheduling,
2318 * cond_resched_softirq() will enable bhs before scheduling.
2319 */
c3921ab7 2320extern int _cond_resched(void);
6f80bd98 2321
613afbf8
FW
2322#define cond_resched() ({ \
2323 __might_sleep(__FILE__, __LINE__, 0); \
2324 _cond_resched(); \
2325})
6f80bd98 2326
613afbf8
FW
2327extern int __cond_resched_lock(spinlock_t *lock);
2328
716a4234
FW
2329#ifdef CONFIG_PREEMPT
2330#define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
02b67cc3 2331#else
716a4234 2332#define PREEMPT_LOCK_OFFSET 0
02b67cc3 2333#endif
716a4234 2334
613afbf8 2335#define cond_resched_lock(lock) ({ \
716a4234 2336 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
613afbf8
FW
2337 __cond_resched_lock(lock); \
2338})
2339
2340extern int __cond_resched_softirq(void);
2341
2342#define cond_resched_softirq() ({ \
2343 __might_sleep(__FILE__, __LINE__, SOFTIRQ_OFFSET); \
2344 __cond_resched_softirq(); \
2345})
1da177e4
LT
2346
2347/*
2348 * Does a critical section need to be broken due to another
95c354fe
NP
2349 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2350 * but a general need for low latency)
1da177e4 2351 */
95c354fe 2352static inline int spin_needbreak(spinlock_t *lock)
1da177e4 2353{
95c354fe
NP
2354#ifdef CONFIG_PREEMPT
2355 return spin_is_contended(lock);
2356#else
1da177e4 2357 return 0;
95c354fe 2358#endif
1da177e4
LT
2359}
2360
f06febc9
FM
2361/*
2362 * Thread group CPU time accounting.
2363 */
4cd4c1b4 2364void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
4da94d49 2365void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
f06febc9 2366
490dea45 2367static inline void thread_group_cputime_init(struct signal_struct *sig)
f06febc9 2368{
4cd4c1b4
PZ
2369 sig->cputimer.cputime = INIT_CPUTIME;
2370 spin_lock_init(&sig->cputimer.lock);
2371 sig->cputimer.running = 0;
f06febc9
FM
2372}
2373
f06febc9
FM
2374static inline void thread_group_cputime_free(struct signal_struct *sig)
2375{
f06febc9
FM
2376}
2377
7bb44ade
RM
2378/*
2379 * Reevaluate whether the task has signals pending delivery.
2380 * Wake the task if so.
2381 * This is required every time the blocked sigset_t changes.
2382 * callers must hold sighand->siglock.
2383 */
2384extern void recalc_sigpending_and_wake(struct task_struct *t);
1da177e4
LT
2385extern void recalc_sigpending(void);
2386
2387extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2388
2389/*
2390 * Wrappers for p->thread_info->cpu access. No-op on UP.
2391 */
2392#ifdef CONFIG_SMP
2393
2394static inline unsigned int task_cpu(const struct task_struct *p)
2395{
a1261f54 2396 return task_thread_info(p)->cpu;
1da177e4
LT
2397}
2398
c65cc870 2399extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
1da177e4
LT
2400
2401#else
2402
2403static inline unsigned int task_cpu(const struct task_struct *p)
2404{
2405 return 0;
2406}
2407
2408static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2409{
2410}
2411
2412#endif /* CONFIG_SMP */
2413
1da177e4 2414extern void arch_pick_mmap_layout(struct mm_struct *mm);
1da177e4 2415
1a3c3034
IM
2416#ifdef CONFIG_TRACING
2417extern void
2418__trace_special(void *__tr, void *__data,
2419 unsigned long arg1, unsigned long arg2, unsigned long arg3);
1da177e4 2420#else
1a3c3034
IM
2421static inline void
2422__trace_special(void *__tr, void *__data,
2423 unsigned long arg1, unsigned long arg2, unsigned long arg3)
1da177e4 2424{
1da177e4
LT
2425}
2426#endif
2427
96f874e2
RR
2428extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2429extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
5c45bf27 2430
1da177e4
LT
2431extern void normalize_rt_tasks(void);
2432
052f1dc7 2433#ifdef CONFIG_GROUP_SCHED
9b5b7751 2434
4cf86d77 2435extern struct task_group init_task_group;
eff766a6
PZ
2436#ifdef CONFIG_USER_SCHED
2437extern struct task_group root_task_group;
6c415b92 2438extern void set_tg_uid(struct user_struct *user);
eff766a6 2439#endif
9b5b7751 2440
ec7dc8ac 2441extern struct task_group *sched_create_group(struct task_group *parent);
4cf86d77 2442extern void sched_destroy_group(struct task_group *tg);
9b5b7751 2443extern void sched_move_task(struct task_struct *tsk);
052f1dc7 2444#ifdef CONFIG_FAIR_GROUP_SCHED
4cf86d77 2445extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
5cb350ba 2446extern unsigned long sched_group_shares(struct task_group *tg);
052f1dc7
PZ
2447#endif
2448#ifdef CONFIG_RT_GROUP_SCHED
9f0c1e56
PZ
2449extern int sched_group_set_rt_runtime(struct task_group *tg,
2450 long rt_runtime_us);
2451extern long sched_group_rt_runtime(struct task_group *tg);
d0b27fa7
PZ
2452extern int sched_group_set_rt_period(struct task_group *tg,
2453 long rt_period_us);
2454extern long sched_group_rt_period(struct task_group *tg);
54e99124 2455extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
052f1dc7 2456#endif
9b5b7751
SV
2457#endif
2458
54e99124
DG
2459extern int task_can_switch_user(struct user_struct *up,
2460 struct task_struct *tsk);
2461
4b98d11b
AD
2462#ifdef CONFIG_TASK_XACCT
2463static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2464{
940389b8 2465 tsk->ioac.rchar += amt;
4b98d11b
AD
2466}
2467
2468static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2469{
940389b8 2470 tsk->ioac.wchar += amt;
4b98d11b
AD
2471}
2472
2473static inline void inc_syscr(struct task_struct *tsk)
2474{
940389b8 2475 tsk->ioac.syscr++;
4b98d11b
AD
2476}
2477
2478static inline void inc_syscw(struct task_struct *tsk)
2479{
940389b8 2480 tsk->ioac.syscw++;
4b98d11b
AD
2481}
2482#else
2483static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2484{
2485}
2486
2487static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2488{
2489}
2490
2491static inline void inc_syscr(struct task_struct *tsk)
2492{
2493}
2494
2495static inline void inc_syscw(struct task_struct *tsk)
2496{
2497}
2498#endif
2499
82455257
DH
2500#ifndef TASK_SIZE_OF
2501#define TASK_SIZE_OF(tsk) TASK_SIZE
2502#endif
2503
0793a61d
TG
2504/*
2505 * Call the function if the target task is executing on a CPU right now:
2506 */
2507extern void task_oncpu_function_call(struct task_struct *p,
2508 void (*func) (void *info), void *info);
2509
2510
cf475ad2
BS
2511#ifdef CONFIG_MM_OWNER
2512extern void mm_update_next_owner(struct mm_struct *mm);
2513extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2514#else
2515static inline void mm_update_next_owner(struct mm_struct *mm)
2516{
2517}
2518
2519static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2520{
2521}
2522#endif /* CONFIG_MM_OWNER */
2523
7c731e0a
SR
2524#define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2525
1da177e4
LT
2526#endif /* __KERNEL__ */
2527
2528#endif