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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_SCHED_H
2#define _LINUX_SCHED_H
3
David Woodhouseb7b3c762006-04-27 00:12:56 +01004/*
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 */
Serge E. Hallyn071df102006-10-02 02:18:17 -070025#define CLONE_NEWUTS 0x04000000 /* New utsname group? */
Kirill Korotaev25b21cb2006-10-02 02:18:19 -070026#define CLONE_NEWIPC 0x08000000 /* New ipcs */
Serge E. Hallyn77ec7392007-07-15 23:41:01 -070027#define CLONE_NEWUSER 0x10000000 /* New user namespace */
Pavel Emelyanov30e49c22007-10-18 23:40:10 -070028#define CLONE_NEWPID 0x20000000 /* New pid namespace */
Eric W. Biederman169e3672007-09-27 17:10:06 -070029#define CLONE_NEWNET 0x40000000 /* New network namespace */
Jens Axboefadad8782008-01-24 08:54:47 +010030#define CLONE_IO 0x80000000 /* Clone io context */
David Woodhouseb7b3c762006-04-27 00:12:56 +010031
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
Ingo Molnar0e6aca42007-07-09 18:51:57 +020039/* SCHED_ISO: reserved but not implemented yet */
40#define SCHED_IDLE 5
David Woodhouseb7b3c762006-04-27 00:12:56 +010041
David Woodhousea3b67142006-04-25 14:54:40 +010042#ifdef __KERNEL__
David Woodhouseb7b3c762006-04-27 00:12:56 +010043
44struct sched_param {
45 int sched_priority;
46};
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <asm/param.h> /* for HZ */
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/capability.h>
51#include <linux/threads.h>
52#include <linux/kernel.h>
53#include <linux/types.h>
54#include <linux/timex.h>
55#include <linux/jiffies.h>
56#include <linux/rbtree.h>
57#include <linux/thread_info.h>
58#include <linux/cpumask.h>
59#include <linux/errno.h>
60#include <linux/nodemask.h>
Martin Schwidefskyc92ff1b2007-10-16 01:24:43 -070061#include <linux/mm_types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63#include <asm/system.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#include <asm/page.h>
65#include <asm/ptrace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#include <asm/cputime.h>
67
68#include <linux/smp.h>
69#include <linux/sem.h>
70#include <linux/signal.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <linux/fs_struct.h>
72#include <linux/compiler.h>
73#include <linux/completion.h>
74#include <linux/pid.h>
75#include <linux/percpu.h>
76#include <linux/topology.h>
Peter Zijlstra3e26c142007-10-16 23:25:50 -070077#include <linux/proportions.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070078#include <linux/seccomp.h>
Ingo Molnare56d0902006-01-08 01:01:37 -080079#include <linux/rcupdate.h>
Ingo Molnar23f78d42006-06-27 02:54:53 -070080#include <linux/rtmutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
David Woodhousea3b67142006-04-25 14:54:40 +010082#include <linux/time.h>
83#include <linux/param.h>
84#include <linux/resource.h>
85#include <linux/timer.h>
86#include <linux/hrtimer.h>
Andrew Morton7c3ab732006-12-10 02:19:19 -080087#include <linux/task_io_accounting.h>
Dhaval Giani5cb350b2007-10-15 17:00:14 +020088#include <linux/kobject.h>
Arjan van de Ven97455122008-01-25 21:08:34 +010089#include <linux/latencytop.h>
David Howells9e2b2dc2008-08-13 16:20:04 +010090#include <linux/cred.h>
David Woodhousea3b67142006-04-25 14:54:40 +010091
92#include <asm/processor.h>
H. J. Lu36d57ac2005-09-06 15:16:49 -070093
Pavel Emelianov78fb7462008-02-07 00:13:51 -080094struct mem_cgroup;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095struct exec_domain;
Ingo Molnarc87e2832006-06-27 02:54:58 -070096struct futex_pi_state;
Alexey Dobriyan286100a2008-01-25 21:08:34 +010097struct robust_list_head;
Neil Brownd89d8792007-05-01 09:53:42 +020098struct bio;
Markus Metzgerca0002a2008-11-25 09:01:25 +010099struct bts_tracer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 * List of flags we want to share for kernel threads,
103 * if only because they are not used by them anyway.
104 */
105#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
106
107/*
108 * These are the constant used to fake the fixed-point load-average
109 * counting. Some notes:
110 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
111 * a load-average precision of 10 bits integer + 11 bits fractional
112 * - if you want to count load-averages more often, you need more
113 * precision, or rounding will get you. With 2-second counting freq,
114 * the EXP_n values would be 1981, 2034 and 2043 if still using only
115 * 11 bit fractions.
116 */
117extern unsigned long avenrun[]; /* Load averages */
118
119#define FSHIFT 11 /* nr of bits of precision */
120#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
Linus Torvalds0c2043a2007-10-07 16:17:38 -0700121#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
123#define EXP_5 2014 /* 1/exp(5sec/5min) */
124#define EXP_15 2037 /* 1/exp(5sec/15min) */
125
126#define CALC_LOAD(load,exp,n) \
127 load *= exp; \
128 load += n*(FIXED_1-exp); \
129 load >>= FSHIFT;
130
131extern unsigned long total_forks;
132extern int nr_threads;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133DECLARE_PER_CPU(unsigned long, process_counts);
134extern int nr_processes(void);
135extern unsigned long nr_running(void);
136extern unsigned long nr_uninterruptible(void);
Jack Steinerdb1b1fe2006-03-31 02:31:21 -0800137extern unsigned long nr_active(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138extern unsigned long nr_iowait(void);
139
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200140struct seq_file;
141struct cfs_rq;
Ingo Molnar4cf86d72007-10-15 17:00:14 +0200142struct task_group;
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200143#ifdef CONFIG_SCHED_DEBUG
144extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
145extern void proc_sched_set_task(struct task_struct *p);
146extern void
Ingo Molnar5cef9ec2007-08-09 11:16:47 +0200147print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200148#else
149static inline void
150proc_sched_show_task(struct task_struct *p, struct seq_file *m)
151{
152}
153static inline void proc_sched_set_task(struct task_struct *p)
154{
155}
156static inline void
Ingo Molnar5cef9ec2007-08-09 11:16:47 +0200157print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200158{
159}
160#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Ingo Molnar690229a2008-04-23 09:31:35 +0200162extern unsigned long long time_sync_thresh;
163
Linus Torvalds4a8342d2005-09-29 15:18:21 -0700164/*
165 * Task state bitmask. NOTE! These bits are also
166 * encoded in fs/proc/array.c: get_task_state().
167 *
168 * We have two separate sets of flags: task->state
169 * is about runnability, while task->exit_state are
170 * about the task exiting. Confusing, but this way
171 * modifying one set can't modify the other one by
172 * mistake.
173 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174#define TASK_RUNNING 0
175#define TASK_INTERRUPTIBLE 1
176#define TASK_UNINTERRUPTIBLE 2
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500177#define __TASK_STOPPED 4
178#define __TASK_TRACED 8
Linus Torvalds4a8342d2005-09-29 15:18:21 -0700179/* in tsk->exit_state */
180#define EXIT_ZOMBIE 16
181#define EXIT_DEAD 32
182/* in tsk->state again */
Mike Galbraithaf927232007-10-15 17:00:13 +0200183#define TASK_DEAD 64
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500184#define TASK_WAKEKILL 128
185
186/* Convenience macros for the sake of set_task_state */
187#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
188#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
189#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500191/* Convenience macros for the sake of wake_up */
192#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500193#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500194
195/* get_task_state() */
196#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500197 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
198 __TASK_TRACED)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500199
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500200#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
201#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500202#define task_is_stopped_or_traced(task) \
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500203 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500204#define task_contributes_to_load(task) \
205 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
207#define __set_task_state(tsk, state_value) \
208 do { (tsk)->state = (state_value); } while (0)
209#define set_task_state(tsk, state_value) \
210 set_mb((tsk)->state, (state_value))
211
Andrew Morton498d0c52005-09-13 01:25:14 -0700212/*
213 * set_current_state() includes a barrier so that the write of current->state
214 * is correctly serialised wrt the caller's subsequent test of whether to
215 * actually sleep:
216 *
217 * set_current_state(TASK_UNINTERRUPTIBLE);
218 * if (do_i_need_to_sleep())
219 * schedule();
220 *
221 * If the caller does not need such serialisation then use __set_current_state()
222 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223#define __set_current_state(state_value) \
224 do { current->state = (state_value); } while (0)
225#define set_current_state(state_value) \
226 set_mb(current->state, (state_value))
227
228/* Task command name length */
229#define TASK_COMM_LEN 16
230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231#include <linux/spinlock.h>
232
233/*
234 * This serializes "schedule()" and also protects
235 * the run-queue from deletions/modifications (but
236 * _adding_ to the beginning of the run-queue has
237 * a separate lock).
238 */
239extern rwlock_t tasklist_lock;
240extern spinlock_t mmlist_lock;
241
Ingo Molnar36c8b582006-07-03 00:25:41 -0700242struct task_struct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
244extern void sched_init(void);
245extern void sched_init_smp(void);
Harvey Harrison2d07b252008-02-15 09:56:34 -0800246extern asmlinkage void schedule_tail(struct task_struct *prev);
Ingo Molnar36c8b582006-07-03 00:25:41 -0700247extern void init_idle(struct task_struct *idle, int cpu);
Ingo Molnar1df21052007-07-09 18:51:58 +0200248extern void init_idle_bootup_task(struct task_struct *idle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Ingo Molnar017730c2008-05-12 21:20:52 +0200250extern int runqueue_is_locked(void);
Oleg Nesterovad474ca2008-11-10 15:39:30 +0100251extern void task_rq_unlock_wait(struct task_struct *p);
Ingo Molnar017730c2008-05-12 21:20:52 +0200252
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253extern cpumask_t nohz_cpu_mask;
Siddha, Suresh B46cb4b72007-05-08 00:32:51 -0700254#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
255extern int select_nohz_load_balancer(int cpu);
256#else
257static inline int select_nohz_load_balancer(int cpu)
258{
259 return 0;
260}
261#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800263/*
Ingo Molnar39bc89f2007-04-25 20:50:03 -0700264 * Only dump TASK_* tasks. (0 for all tasks)
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800265 */
266extern void show_state_filter(unsigned long state_filter);
267
268static inline void show_state(void)
269{
Ingo Molnar39bc89f2007-04-25 20:50:03 -0700270 show_state_filter(0);
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800271}
272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273extern void show_regs(struct pt_regs *);
274
275/*
276 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
277 * task), SP is the stack pointer of the first frame that should be shown in the back
278 * trace (or NULL if the entire call-chain of the task should be shown).
279 */
280extern void show_stack(struct task_struct *task, unsigned long *sp);
281
282void io_schedule(void);
283long io_schedule_timeout(long timeout);
284
285extern void cpu_init (void);
286extern void trap_init(void);
287extern void update_process_times(int user);
288extern void scheduler_tick(void);
289
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100290extern void sched_show_task(struct task_struct *p);
291
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700292#ifdef CONFIG_DETECT_SOFTLOCKUP
Ingo Molnar6687a972006-03-24 03:18:41 -0800293extern void softlockup_tick(void);
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700294extern void touch_softlockup_watchdog(void);
Jeremy Fitzhardinge04c91672007-05-08 00:28:05 -0700295extern void touch_all_softlockup_watchdogs(void);
Ingo Molnar9c44bc02008-05-12 21:21:04 +0200296extern unsigned int softlockup_panic;
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100297extern unsigned long sysctl_hung_task_check_count;
298extern unsigned long sysctl_hung_task_timeout_secs;
Ingo Molnar90739082008-01-25 21:08:34 +0100299extern unsigned long sysctl_hung_task_warnings;
Dimitri Sivanich9383d962008-05-12 21:21:14 +0200300extern int softlockup_thresh;
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700301#else
Ingo Molnar6687a972006-03-24 03:18:41 -0800302static inline void softlockup_tick(void)
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700303{
304}
305static inline void spawn_softlockup_task(void)
306{
307}
308static inline void touch_softlockup_watchdog(void)
309{
310}
Jeremy Fitzhardinge04c91672007-05-08 00:28:05 -0700311static inline void touch_all_softlockup_watchdogs(void)
312{
313}
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700314#endif
315
316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317/* Attach to any functions which should be ignored in wchan output. */
318#define __sched __attribute__((__section__(".sched.text")))
Ingo Molnardeaf2222007-11-28 15:52:56 +0100319
320/* Linker adds these: start and end of __sched functions */
321extern char __sched_text_start[], __sched_text_end[];
322
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323/* Is this address in the __sched functions? */
324extern int in_sched_functions(unsigned long addr);
325
326#define MAX_SCHEDULE_TIMEOUT LONG_MAX
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800327extern signed long schedule_timeout(signed long timeout);
Nishanth Aravamudan64ed93a2005-09-10 00:27:21 -0700328extern signed long schedule_timeout_interruptible(signed long timeout);
Matthew Wilcox294d5cc2007-12-06 11:59:46 -0500329extern signed long schedule_timeout_killable(signed long timeout);
Nishanth Aravamudan64ed93a2005-09-10 00:27:21 -0700330extern signed long schedule_timeout_uninterruptible(signed long timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331asmlinkage void schedule(void);
332
Serge E. Hallynab516012006-10-02 02:18:06 -0700333struct nsproxy;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700334struct user_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336/* Maximum number of active map areas.. This is a random (large) number */
337#define DEFAULT_MAX_MAP_COUNT 65536
338
339extern int sysctl_max_map_count;
340
341#include <linux/aio.h>
342
343extern unsigned long
344arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
345 unsigned long, unsigned long);
346extern unsigned long
347arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
348 unsigned long len, unsigned long pgoff,
349 unsigned long flags);
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700350extern void arch_unmap_area(struct mm_struct *, unsigned long);
351extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
Jeremy Fitzhardingef7d0b922008-09-09 15:43:22 -0700353#if USE_SPLIT_PTLOCKS
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700354/*
355 * The mm counters are not protected by its page_table_lock,
356 * so must be incremented atomically.
357 */
Christoph Lameterd3cb4872006-01-06 00:11:20 -0800358#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
359#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
360#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
361#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
362#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700363
Jeremy Fitzhardingef7d0b922008-09-09 15:43:22 -0700364#else /* !USE_SPLIT_PTLOCKS */
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700365/*
366 * The mm counters are protected by its page_table_lock,
367 * so can be incremented directly.
368 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
370#define get_mm_counter(mm, member) ((mm)->_##member)
371#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
372#define inc_mm_counter(mm, member) (mm)->_##member++
373#define dec_mm_counter(mm, member) (mm)->_##member--
Hugh Dickins42946212005-10-29 18:16:05 -0700374
Jeremy Fitzhardingef7d0b922008-09-09 15:43:22 -0700375#endif /* !USE_SPLIT_PTLOCKS */
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700376
377#define get_mm_rss(mm) \
378 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
Hugh Dickins365e9c872005-10-29 18:16:18 -0700379#define update_hiwater_rss(mm) do { \
380 unsigned long _rss = get_mm_rss(mm); \
381 if ((mm)->hiwater_rss < _rss) \
382 (mm)->hiwater_rss = _rss; \
383} while (0)
384#define update_hiwater_vm(mm) do { \
385 if ((mm)->hiwater_vm < (mm)->total_vm) \
386 (mm)->hiwater_vm = (mm)->total_vm; \
387} while (0)
388
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700389extern void set_dumpable(struct mm_struct *mm, int value);
390extern int get_dumpable(struct mm_struct *mm);
391
392/* mm flags */
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700393/* dumpable bits */
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700394#define MMF_DUMPABLE 0 /* core dump is permitted */
395#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700396#define MMF_DUMPABLE_BITS 2
397
398/* coredump filter bits */
399#define MMF_DUMP_ANON_PRIVATE 2
400#define MMF_DUMP_ANON_SHARED 3
401#define MMF_DUMP_MAPPED_PRIVATE 4
402#define MMF_DUMP_MAPPED_SHARED 5
Roland McGrath82df3972007-10-16 23:27:02 -0700403#define MMF_DUMP_ELF_HEADERS 6
KOSAKI Motohiroe575f112008-10-18 20:27:08 -0700404#define MMF_DUMP_HUGETLB_PRIVATE 7
405#define MMF_DUMP_HUGETLB_SHARED 8
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700406#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
KOSAKI Motohiroe575f112008-10-18 20:27:08 -0700407#define MMF_DUMP_FILTER_BITS 7
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700408#define MMF_DUMP_FILTER_MASK \
409 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
410#define MMF_DUMP_FILTER_DEFAULT \
KOSAKI Motohiroe575f112008-10-18 20:27:08 -0700411 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
Roland McGrath656eb2c2008-10-18 20:28:23 -0700412 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
413
414#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
415# define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
416#else
417# define MMF_DUMP_MASK_DEFAULT_ELF 0
418#endif
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420struct sighand_struct {
421 atomic_t count;
422 struct k_sigaction action[_NSIG];
423 spinlock_t siglock;
Davide Libenzib8fceee2007-09-20 12:40:16 -0700424 wait_queue_head_t signalfd_wqh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425};
426
KaiGai Kohei0e464812006-06-25 05:49:24 -0700427struct pacct_struct {
KaiGai Koheif6ec29a2006-06-25 05:49:25 -0700428 int ac_flag;
429 long ac_exitcode;
KaiGai Kohei0e464812006-06-25 05:49:24 -0700430 unsigned long ac_mem;
KaiGai Kohei77787bf2006-06-25 05:49:26 -0700431 cputime_t ac_utime, ac_stime;
432 unsigned long ac_minflt, ac_majflt;
KaiGai Kohei0e464812006-06-25 05:49:24 -0700433};
434
Frank Mayharf06febc2008-09-12 09:54:39 -0700435/**
436 * struct task_cputime - collected CPU time counts
437 * @utime: time spent in user mode, in &cputime_t units
438 * @stime: time spent in kernel mode, in &cputime_t units
439 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
Ingo Molnar5ce73a42008-09-14 17:11:46 +0200440 *
Frank Mayharf06febc2008-09-12 09:54:39 -0700441 * This structure groups together three kinds of CPU time that are
442 * tracked for threads and thread groups. Most things considering
443 * CPU time want to group these counts together and treat all three
444 * of them in parallel.
445 */
446struct task_cputime {
447 cputime_t utime;
448 cputime_t stime;
449 unsigned long long sum_exec_runtime;
450};
451/* Alternate field names when used to cache expirations. */
452#define prof_exp stime
453#define virt_exp utime
454#define sched_exp sum_exec_runtime
455
456/**
457 * struct thread_group_cputime - thread group interval timer counts
458 * @totals: thread group interval timers; substructure for
459 * uniprocessor kernel, per-cpu for SMP kernel.
460 *
461 * This structure contains the version of task_cputime, above, that is
462 * used for thread group CPU clock calculations.
463 */
Frank Mayharf06febc2008-09-12 09:54:39 -0700464struct thread_group_cputime {
465 struct task_cputime *totals;
466};
Frank Mayharf06febc2008-09-12 09:54:39 -0700467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468/*
469 * NOTE! "signal_struct" does not have it's own
470 * locking, because a shared signal_struct always
471 * implies a shared sighand_struct, so locking
472 * sighand_struct is always a proper superset of
473 * the locking of signal_struct.
474 */
475struct signal_struct {
476 atomic_t count;
477 atomic_t live;
478
479 wait_queue_head_t wait_chldexit; /* for wait4() */
480
481 /* current thread group signal load-balancing target: */
Ingo Molnar36c8b582006-07-03 00:25:41 -0700482 struct task_struct *curr_target;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 /* shared signal handling: */
485 struct sigpending shared_pending;
486
487 /* thread group exit support */
488 int group_exit_code;
489 /* overloaded:
490 * - notify group_exit_task when ->count is equal to notify_count
491 * - everyone except group_exit_task is stopped during signal delivery
492 * of fatal signals, group_exit_task processes the signal.
493 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 int notify_count;
Richard Kennedy07dd20e2008-08-01 13:18:04 +0100495 struct task_struct *group_exit_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
497 /* thread group stop support, overloads group_exit_code too */
498 int group_stop_count;
499 unsigned int flags; /* see SIGNAL_* flags below */
500
501 /* POSIX.1b Interval Timers */
502 struct list_head posix_timers;
503
504 /* ITIMER_REAL timer for the process */
Thomas Gleixner2ff678b2006-01-09 20:52:34 -0800505 struct hrtimer real_timer;
Oleg Nesterovfea9d172008-02-08 04:19:19 -0800506 struct pid *leader_pid;
Thomas Gleixner2ff678b2006-01-09 20:52:34 -0800507 ktime_t it_real_incr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
509 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
510 cputime_t it_prof_expires, it_virt_expires;
511 cputime_t it_prof_incr, it_virt_incr;
512
Frank Mayharf06febc2008-09-12 09:54:39 -0700513 /*
514 * Thread group totals for process CPU clocks.
515 * See thread_group_cputime(), et al, for details.
516 */
517 struct thread_group_cputime cputime;
518
519 /* Earliest-expiration cache. */
520 struct task_cputime cputime_expires;
521
522 struct list_head cpu_timers[3];
523
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 /* job control IDs */
Pavel Emelyanov9a2e7052007-10-18 23:40:39 -0700525
526 /*
527 * pgrp and session fields are deprecated.
528 * use the task_session_Xnr and task_pgrp_Xnr routines below
529 */
530
531 union {
532 pid_t pgrp __deprecated;
533 pid_t __pgrp;
534 };
535
Eric W. Biedermanab521dc2007-02-12 00:53:00 -0800536 struct pid *tty_old_pgrp;
Cedric Le Goater1ec320a2006-12-08 02:37:55 -0800537
538 union {
539 pid_t session __deprecated;
540 pid_t __session;
541 };
542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 /* boolean value for session group leader */
544 int leader;
545
546 struct tty_struct *tty; /* NULL if no tty */
547
548 /*
549 * Cumulative resource counters for dead threads in the group,
550 * and for reaped dead child processes forked by this group.
551 * Live threads maintain their own counters and add to these
552 * in __exit_signal, except for the group leader.
553 */
Frank Mayharf06febc2008-09-12 09:54:39 -0700554 cputime_t cutime, cstime;
Laurent Vivier9ac52312007-10-15 17:00:19 +0200555 cputime_t gtime;
556 cputime_t cgtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
558 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
Eric Dumazet6eaeeab2007-05-10 22:22:37 -0700559 unsigned long inblock, oublock, cinblock, coublock;
Andrea Righi940389b2008-07-28 00:48:12 +0200560 struct task_io_accounting ioac;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
562 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 * We don't bother to synchronize most readers of this at all,
564 * because there is no reader checking a limit that actually needs
565 * to get both rlim_cur and rlim_max atomically, and either one
566 * alone is a single word that can safely be read normally.
567 * getrlimit/setrlimit use task_lock(current->group_leader) to
568 * protect this instead of the siglock, because they really
569 * have no need to disable irqs.
570 */
571 struct rlimit rlim[RLIM_NLIMITS];
572
KaiGai Kohei0e464812006-06-25 05:49:24 -0700573#ifdef CONFIG_BSD_PROCESS_ACCT
574 struct pacct_struct pacct; /* per-process accounting information */
575#endif
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700576#ifdef CONFIG_TASKSTATS
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700577 struct taskstats *stats;
578#endif
Miloslav Trmac522ed772007-07-15 23:40:56 -0700579#ifdef CONFIG_AUDIT
580 unsigned audit_tty;
581 struct tty_audit_buf *tty_audit_buf;
582#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583};
584
Nick Piggin4866cde2005-06-25 14:57:23 -0700585/* Context switch must be unlocked if interrupts are to be enabled */
586#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
587# define __ARCH_WANT_UNLOCKED_CTXSW
588#endif
589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590/*
591 * Bits in flags field of signal_struct.
592 */
593#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
594#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
595#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
596#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
Oleg Nesterove4420552008-04-30 00:52:44 -0700597/*
598 * Pending notifications to parent.
599 */
600#define SIGNAL_CLD_STOPPED 0x00000010
601#define SIGNAL_CLD_CONTINUED 0x00000020
602#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Oleg Nesterovfae5fa42008-04-30 00:53:03 -0700604#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
605
Oleg Nesteroved5d2ca2008-02-04 22:27:24 -0800606/* If true, all threads except ->group_exit_task have pending SIGKILL */
607static inline int signal_group_exit(const struct signal_struct *sig)
608{
609 return (sig->flags & SIGNAL_GROUP_EXIT) ||
610 (sig->group_exit_task != NULL);
611}
612
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613/*
614 * Some day this will be a full-fledged user tracking system..
615 */
616struct user_struct {
617 atomic_t __count; /* reference count */
618 atomic_t processes; /* How many processes does this user have? */
619 atomic_t files; /* How many open files does this user have? */
620 atomic_t sigpending; /* How many pending signals does this user have? */
Amy Griffis2d9048e2006-06-01 13:10:59 -0700621#ifdef CONFIG_INOTIFY_USER
Robert Love0eeca282005-07-12 17:06:03 -0400622 atomic_t inotify_watches; /* How many inotify watches does this user have? */
623 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
624#endif
Davide Libenzi7ef99642008-12-01 13:13:55 -0800625#ifdef CONFIG_EPOLL
626 atomic_t epoll_devs; /* The number of epoll descriptors currently open */
627 atomic_t epoll_watches; /* The number of file descriptors currently watched */
628#endif
Alexey Dobriyan970a8642007-10-16 23:30:09 -0700629#ifdef CONFIG_POSIX_MQUEUE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 /* protected by mq_lock */
631 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
Alexey Dobriyan970a8642007-10-16 23:30:09 -0700632#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 unsigned long locked_shm; /* How many pages of mlocked shm ? */
634
635#ifdef CONFIG_KEYS
636 struct key *uid_keyring; /* UID specific keyring */
637 struct key *session_keyring; /* UID's default session keyring */
638#endif
639
640 /* Hash table maintenance information */
Pavel Emelyanov735de222007-09-18 22:46:44 -0700641 struct hlist_node uidhash_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 uid_t uid;
Serge Hallyn18b6e042008-10-15 16:38:45 -0500643 struct user_namespace *user_ns;
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200644
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100645#ifdef CONFIG_USER_SCHED
Ingo Molnar4cf86d72007-10-15 17:00:14 +0200646 struct task_group *tg;
Dhaval Gianib1a8c172007-10-17 16:55:11 +0200647#ifdef CONFIG_SYSFS
Kay Sieverseb41d942007-11-02 13:47:53 +0100648 struct kobject kobj;
Dhaval Giani5cb350b2007-10-15 17:00:14 +0200649 struct work_struct work;
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200650#endif
Dhaval Gianib1a8c172007-10-17 16:55:11 +0200651#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652};
653
Kay Sieverseb41d942007-11-02 13:47:53 +0100654extern int uids_sysfs_init(void);
Dhaval Giani5cb350b2007-10-15 17:00:14 +0200655
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656extern struct user_struct *find_user(uid_t);
657
658extern struct user_struct root_user;
659#define INIT_USER (&root_user)
660
David Howellsb6dff3e2008-11-14 10:39:16 +1100661
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662struct backing_dev_info;
663struct reclaim_state;
664
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700665#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666struct sched_info {
667 /* cumulative counters */
Ingo Molnar2d723762007-10-15 17:00:12 +0200668 unsigned long pcount; /* # of times run on this cpu */
Ken Chen9c2c4802008-12-16 23:41:22 -0800669 unsigned long long run_delay; /* time spent waiting on a runqueue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
671 /* timestamps */
Balbir Singh172ba842007-07-09 18:52:00 +0200672 unsigned long long last_arrival,/* when we last ran on a cpu */
673 last_queued; /* when we were last queued to run */
Ingo Molnarb8efb562007-10-15 17:00:10 +0200674#ifdef CONFIG_SCHEDSTATS
675 /* BKL stats */
Ken Chen480b9432007-10-18 21:32:56 +0200676 unsigned int bkl_count;
Ingo Molnarb8efb562007-10-15 17:00:10 +0200677#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678};
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700679#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
Shailabh Nagarca74e922006-07-14 00:24:36 -0700681#ifdef CONFIG_TASK_DELAY_ACCT
682struct task_delay_info {
683 spinlock_t lock;
684 unsigned int flags; /* Private per-task flags */
685
686 /* For each stat XXX, add following, aligned appropriately
687 *
688 * struct timespec XXX_start, XXX_end;
689 * u64 XXX_delay;
690 * u32 XXX_count;
691 *
692 * Atomicity of updates to XXX_delay, XXX_count protected by
693 * single lock above (split into XXX_lock if contention is an issue).
694 */
Shailabh Nagar0ff92242006-07-14 00:24:37 -0700695
696 /*
697 * XXX_count is incremented on every XXX operation, the delay
698 * associated with the operation is added to XXX_delay.
699 * XXX_delay contains the accumulated delay time in nanoseconds.
700 */
701 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
702 u64 blkio_delay; /* wait for sync block io completion */
703 u64 swapin_delay; /* wait for swapin block io completion */
704 u32 blkio_count; /* total count of the number of sync block */
705 /* io operations performed */
706 u32 swapin_count; /* total count of the number of swapin block */
707 /* io operations performed */
Keika Kobayashi873b4772008-07-25 01:48:52 -0700708
709 struct timespec freepages_start, freepages_end;
710 u64 freepages_delay; /* wait for memory reclaim */
711 u32 freepages_count; /* total count of memory reclaim */
Shailabh Nagarca74e922006-07-14 00:24:36 -0700712};
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700713#endif /* CONFIG_TASK_DELAY_ACCT */
714
715static inline int sched_info_on(void)
716{
717#ifdef CONFIG_SCHEDSTATS
718 return 1;
719#elif defined(CONFIG_TASK_DELAY_ACCT)
720 extern int delayacct_on;
721 return delayacct_on;
722#else
723 return 0;
Shailabh Nagarca74e922006-07-14 00:24:36 -0700724#endif
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700725}
Shailabh Nagarca74e922006-07-14 00:24:36 -0700726
Ingo Molnard15bcfd2007-07-09 18:51:57 +0200727enum cpu_idle_type {
728 CPU_IDLE,
729 CPU_NOT_IDLE,
730 CPU_NEWLY_IDLE,
731 CPU_MAX_IDLE_TYPES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732};
733
734/*
735 * sched-domains (multiprocessor balancing) declarations:
736 */
Ingo Molnar9aa7b362007-07-09 18:51:58 +0200737
738/*
739 * Increase resolution of nice-level calculations:
740 */
741#define SCHED_LOAD_SHIFT 10
742#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
743
Suresh Siddhaf8700df2007-08-23 15:18:02 +0200744#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
Peter Williams2dd73a42006-06-27 02:54:34 -0700746#ifdef CONFIG_SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
748#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
749#define SD_BALANCE_EXEC 4 /* Balance on exec */
Nick Piggin147cbb42005-06-25 14:57:19 -0700750#define SD_BALANCE_FORK 8 /* Balance on fork, clone */
751#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
752#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
753#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
754#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700755#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700756#define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
Christoph Lameter08c183f2006-12-10 02:20:29 -0800757#define SD_SERIALIZE 1024 /* Only a single load balancing instance */
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900758#define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700759
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700760#define BALANCE_FOR_MC_POWER \
761 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
762
763#define BALANCE_FOR_PKG_POWER \
764 ((sched_mc_power_savings || sched_smt_power_savings) ? \
765 SD_POWERSAVINGS_BALANCE : 0)
766
767#define test_sd_parent(sd, flag) ((sd->parent && \
768 (sd->parent->flags & flag)) ? 1 : 0)
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700769
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
771struct sched_group {
772 struct sched_group *next; /* Must be a circular list */
773 cpumask_t cpumask;
774
775 /*
776 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
777 * single CPU. This is read only (except for setup, hotplug CPU).
Eric Dumazet5517d862007-05-08 00:32:57 -0700778 * Note : Never change cpu_power without recompute its reciprocal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 */
Eric Dumazet5517d862007-05-08 00:32:57 -0700780 unsigned int __cpu_power;
781 /*
782 * reciprocal value of cpu_power to avoid expensive divides
783 * (see include/linux/reciprocal_div.h)
784 */
785 u32 reciprocal_cpu_power;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786};
787
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900788enum sched_domain_level {
789 SD_LV_NONE = 0,
790 SD_LV_SIBLING,
791 SD_LV_MC,
792 SD_LV_CPU,
793 SD_LV_NODE,
794 SD_LV_ALLNODES,
795 SD_LV_MAX
796};
797
798struct sched_domain_attr {
799 int relax_domain_level;
800};
801
802#define SD_ATTR_INIT (struct sched_domain_attr) { \
803 .relax_domain_level = -1, \
804}
805
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806struct sched_domain {
807 /* These fields must be setup */
808 struct sched_domain *parent; /* top domain must be null terminated */
Siddha, Suresh B1a848872006-10-03 01:14:08 -0700809 struct sched_domain *child; /* bottom domain must be null terminated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 struct sched_group *groups; /* the balancing groups of the domain */
811 cpumask_t span; /* span of all CPUs in this domain */
812 unsigned long min_interval; /* Minimum balance interval ms */
813 unsigned long max_interval; /* Maximum balance interval ms */
814 unsigned int busy_factor; /* less balancing by factor if busy */
815 unsigned int imbalance_pct; /* No balance until over watermark */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
Nick Piggin78979862005-06-25 14:57:13 -0700817 unsigned int busy_idx;
818 unsigned int idle_idx;
819 unsigned int newidle_idx;
820 unsigned int wake_idx;
Nick Piggin147cbb42005-06-25 14:57:19 -0700821 unsigned int forkexec_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 int flags; /* See SD_* */
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900823 enum sched_domain_level level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
825 /* Runtime fields. */
826 unsigned long last_balance; /* init to jiffies. units in jiffies */
827 unsigned int balance_interval; /* initialise to 1. units in ms. */
828 unsigned int nr_balance_failed; /* initialise to 0 */
829
Peter Zijlstra2398f2c2008-06-27 13:41:35 +0200830 u64 last_update;
831
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832#ifdef CONFIG_SCHEDSTATS
833 /* load_balance() stats */
Ken Chen480b9432007-10-18 21:32:56 +0200834 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
835 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
836 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
837 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
838 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
839 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
840 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
841 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
843 /* Active load balancing */
Ken Chen480b9432007-10-18 21:32:56 +0200844 unsigned int alb_count;
845 unsigned int alb_failed;
846 unsigned int alb_pushed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
Nick Piggin68767a02005-06-25 14:57:20 -0700848 /* SD_BALANCE_EXEC stats */
Ken Chen480b9432007-10-18 21:32:56 +0200849 unsigned int sbe_count;
850 unsigned int sbe_balanced;
851 unsigned int sbe_pushed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Nick Piggin68767a02005-06-25 14:57:20 -0700853 /* SD_BALANCE_FORK stats */
Ken Chen480b9432007-10-18 21:32:56 +0200854 unsigned int sbf_count;
855 unsigned int sbf_balanced;
856 unsigned int sbf_pushed;
Nick Piggin68767a02005-06-25 14:57:20 -0700857
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 /* try_to_wake_up() stats */
Ken Chen480b9432007-10-18 21:32:56 +0200859 unsigned int ttwu_wake_remote;
860 unsigned int ttwu_move_affine;
861 unsigned int ttwu_move_balance;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862#endif
Ingo Molnara5d8c342008-10-09 11:35:51 +0200863#ifdef CONFIG_SCHED_DEBUG
864 char *name;
865#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866};
867
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900868extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
869 struct sched_domain_attr *dattr_new);
Heiko Carstens9aefd0a2008-03-12 18:31:58 +0100870extern int arch_reinit_sched_domains(void);
Paul Jackson029190c2007-10-18 23:40:20 -0700871
Ingo Molnar1b427c12008-07-18 14:01:39 +0200872#else /* CONFIG_SMP */
873
874struct sched_domain_attr;
875
876static inline void
877partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
878 struct sched_domain_attr *dattr_new)
879{
880}
881#endif /* !CONFIG_SMP */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883struct io_context; /* See blkdev.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885
Chen, Kenneth W383f2832005-09-09 13:02:02 -0700886#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
Ingo Molnar36c8b582006-07-03 00:25:41 -0700887extern void prefetch_stack(struct task_struct *t);
Chen, Kenneth W383f2832005-09-09 13:02:02 -0700888#else
889static inline void prefetch_stack(struct task_struct *t) { }
890#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
892struct audit_context; /* See audit.c */
893struct mempolicy;
Jens Axboeb92ce552006-04-11 13:52:07 +0200894struct pipe_inode_info;
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -0700895struct uts_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896
Ingo Molnar20b8a592007-07-09 18:51:58 +0200897struct rq;
898struct sched_domain;
899
900struct sched_class {
Ingo Molnar5522d5d2007-10-15 17:00:12 +0200901 const struct sched_class *next;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200902
Ingo Molnarfd390f62007-08-09 11:16:48 +0200903 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
Ingo Molnarf02231e2007-08-09 11:16:48 +0200904 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
Dmitry Adamushko4530d7a2007-10-15 17:00:08 +0200905 void (*yield_task) (struct rq *rq);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200906
Peter Zijlstra15afe092008-09-20 23:38:02 +0200907 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200908
Ingo Molnarfb8d4722007-08-09 11:16:48 +0200909 struct task_struct * (*pick_next_task) (struct rq *rq);
Ingo Molnar31ee5292007-08-09 11:16:49 +0200910 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200911
Peter Williams681f3e62007-10-24 18:23:51 +0200912#ifdef CONFIG_SMP
Li Zefan4ce72a22008-10-22 15:25:26 +0800913 int (*select_task_rq)(struct task_struct *p, int sync);
914
Peter Williams43010652007-08-09 11:16:46 +0200915 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
Peter Williamse1d14842007-10-24 18:23:51 +0200916 struct rq *busiest, unsigned long max_load_move,
Ingo Molnar20b8a592007-07-09 18:51:58 +0200917 struct sched_domain *sd, enum cpu_idle_type idle,
Peter Williamsa4ac01c2007-08-09 11:16:46 +0200918 int *all_pinned, int *this_best_prio);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200919
Peter Williamse1d14842007-10-24 18:23:51 +0200920 int (*move_one_task) (struct rq *this_rq, int this_cpu,
921 struct rq *busiest, struct sched_domain *sd,
922 enum cpu_idle_type idle);
Steven Rostedt9a897c52008-01-25 21:08:22 +0100923 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
924 void (*post_schedule) (struct rq *this_rq);
925 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
Peter Williamse1d14842007-10-24 18:23:51 +0200926
Mike Traviscd8ba7c2008-03-26 14:23:49 -0700927 void (*set_cpus_allowed)(struct task_struct *p,
928 const cpumask_t *newmask);
Gregory Haskins57d885f2008-01-25 21:08:18 +0100929
Gregory Haskins1f11eb62008-06-04 15:04:05 -0400930 void (*rq_online)(struct rq *rq);
931 void (*rq_offline)(struct rq *rq);
Li Zefan4ce72a22008-10-22 15:25:26 +0800932#endif
933
934 void (*set_curr_task) (struct rq *rq);
935 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
936 void (*task_new) (struct rq *rq, struct task_struct *p);
Steven Rostedtcb469842008-01-25 21:08:22 +0100937
938 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
939 int running);
940 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
941 int running);
942 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
943 int oldprio, int running);
Peter Zijlstra810b3812008-02-29 15:21:01 -0500944
945#ifdef CONFIG_FAIR_GROUP_SCHED
946 void (*moved_group) (struct task_struct *p);
947#endif
Ingo Molnar20b8a592007-07-09 18:51:58 +0200948};
949
950struct load_weight {
951 unsigned long weight, inv_weight;
952};
953
954/*
955 * CFS stats for a schedulable entity (task, task-group etc)
956 *
957 * Current field usage histogram:
958 *
959 * 4 se->block_start
960 * 4 se->run_node
961 * 4 se->sleep_start
Ingo Molnar20b8a592007-07-09 18:51:58 +0200962 * 6 se->load.weight
Ingo Molnar20b8a592007-07-09 18:51:58 +0200963 */
964struct sched_entity {
Ingo Molnar20b8a592007-07-09 18:51:58 +0200965 struct load_weight load; /* for load-balancing */
966 struct rb_node run_node;
Peter Zijlstra4a55bd52008-04-19 19:45:00 +0200967 struct list_head group_node;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200968 unsigned int on_rq;
969
Ingo Molnar20b8a592007-07-09 18:51:58 +0200970 u64 exec_start;
Ingo Molnar94c18222007-08-02 17:41:40 +0200971 u64 sum_exec_runtime;
Ingo Molnare9acbff2007-10-15 17:00:04 +0200972 u64 vruntime;
Ingo Molnarf6cf8912007-08-28 12:53:24 +0200973 u64 prev_sum_exec_runtime;
Ingo Molnar94c18222007-08-02 17:41:40 +0200974
Ingo Molnar4ae7d5c2008-03-19 01:42:00 +0100975 u64 last_wakeup;
976 u64 avg_overlap;
977
Ingo Molnar94c18222007-08-02 17:41:40 +0200978#ifdef CONFIG_SCHEDSTATS
979 u64 wait_start;
980 u64 wait_max;
Arjan van de Ven6d082592008-01-25 21:08:35 +0100981 u64 wait_count;
982 u64 wait_sum;
Ingo Molnar94c18222007-08-02 17:41:40 +0200983
984 u64 sleep_start;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200985 u64 sleep_max;
Ingo Molnar94c18222007-08-02 17:41:40 +0200986 s64 sum_sleep_runtime;
987
988 u64 block_start;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200989 u64 block_max;
990 u64 exec_max;
Ingo Molnareba1ed42007-10-15 17:00:02 +0200991 u64 slice_max;
Ingo Molnarcc367732007-10-15 17:00:18 +0200992
993 u64 nr_migrations;
994 u64 nr_migrations_cold;
995 u64 nr_failed_migrations_affine;
996 u64 nr_failed_migrations_running;
997 u64 nr_failed_migrations_hot;
998 u64 nr_forced_migrations;
999 u64 nr_forced2_migrations;
1000
1001 u64 nr_wakeups;
1002 u64 nr_wakeups_sync;
1003 u64 nr_wakeups_migrate;
1004 u64 nr_wakeups_local;
1005 u64 nr_wakeups_remote;
1006 u64 nr_wakeups_affine;
1007 u64 nr_wakeups_affine_attempts;
1008 u64 nr_wakeups_passive;
1009 u64 nr_wakeups_idle;
Ingo Molnar94c18222007-08-02 17:41:40 +02001010#endif
1011
Ingo Molnar20b8a592007-07-09 18:51:58 +02001012#ifdef CONFIG_FAIR_GROUP_SCHED
1013 struct sched_entity *parent;
1014 /* rq on which this entity is (to be) queued: */
1015 struct cfs_rq *cfs_rq;
1016 /* rq "owned" by this entity/group: */
1017 struct cfs_rq *my_q;
1018#endif
1019};
Ingo Molnar70b97a72006-07-03 00:25:42 -07001020
Peter Zijlstrafa717062008-01-25 21:08:27 +01001021struct sched_rt_entity {
1022 struct list_head run_list;
Peter Zijlstra78f2c7d2008-01-25 21:08:27 +01001023 unsigned long timeout;
Richard Kennedybee367e2008-08-01 13:24:08 +01001024 unsigned int time_slice;
Peter Zijlstra6f505b12008-01-25 21:08:30 +01001025 int nr_cpus_allowed;
1026
Peter Zijlstra58d6c2d2008-04-19 19:45:00 +02001027 struct sched_rt_entity *back;
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01001028#ifdef CONFIG_RT_GROUP_SCHED
Peter Zijlstra6f505b12008-01-25 21:08:30 +01001029 struct sched_rt_entity *parent;
1030 /* rq on which this entity is (to be) queued: */
1031 struct rt_rq *rt_rq;
1032 /* rq "owned" by this entity/group: */
1033 struct rt_rq *my_q;
1034#endif
Peter Zijlstrafa717062008-01-25 21:08:27 +01001035};
1036
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037struct task_struct {
1038 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
Roman Zippelf7e42172007-05-09 02:35:17 -07001039 void *stack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 atomic_t usage;
William Cohen97dc32c2007-05-08 00:23:41 -07001041 unsigned int flags; /* per process flags, defined below */
1042 unsigned int ptrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -07001044 int lock_depth; /* BKL lock depth */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
Peter Williams2dd73a42006-06-27 02:54:34 -07001046#ifdef CONFIG_SMP
1047#ifdef __ARCH_WANT_UNLOCKED_CTXSW
Nick Piggin4866cde2005-06-25 14:57:23 -07001048 int oncpu;
1049#endif
Peter Williams2dd73a42006-06-27 02:54:34 -07001050#endif
Ingo Molnar50e645a2007-07-09 18:52:00 +02001051
Ingo Molnarb29739f2006-06-27 02:54:51 -07001052 int prio, static_prio, normal_prio;
Richard Kennedyc7aceab2008-05-15 12:09:15 +01001053 unsigned int rt_priority;
Ingo Molnar5522d5d2007-10-15 17:00:12 +02001054 const struct sched_class *sched_class;
Ingo Molnar20b8a592007-07-09 18:51:58 +02001055 struct sched_entity se;
Peter Zijlstrafa717062008-01-25 21:08:27 +01001056 struct sched_rt_entity rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057
Avi Kivitye107be32007-07-26 13:40:43 +02001058#ifdef CONFIG_PREEMPT_NOTIFIERS
1059 /* list of struct preempt_notifier: */
1060 struct hlist_head preempt_notifiers;
1061#endif
1062
Alexey Dobriyan18796aa2007-10-16 23:30:26 -07001063 /*
1064 * fpu_counter contains the number of consecutive context switches
1065 * that the FPU is used. If this is over a threshold, the lazy fpu
1066 * saving becomes unlazy to save the trap. This is an unsigned char
1067 * so that after 256 times the counter wraps and the behavior turns
1068 * lazy again; this to deal with bursty apps that only use FPU for
1069 * a short time
1070 */
1071 unsigned char fpu_counter;
1072 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -07001073#ifdef CONFIG_BLK_DEV_IO_TRACE
Jens Axboe2056a782006-03-23 20:00:26 +01001074 unsigned int btrace_seq;
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -07001075#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076
William Cohen97dc32c2007-05-08 00:23:41 -07001077 unsigned int policy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 cpumask_t cpus_allowed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079
Paul E. McKenneye260be62008-01-25 21:08:24 +01001080#ifdef CONFIG_PREEMPT_RCU
1081 int rcu_read_lock_nesting;
1082 int rcu_flipctr_idx;
1083#endif /* #ifdef CONFIG_PREEMPT_RCU */
1084
Chandra Seetharaman52f17b62006-07-14 00:24:38 -07001085#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 struct sched_info sched_info;
1087#endif
1088
1089 struct list_head tasks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
1091 struct mm_struct *mm, *active_mm;
1092
1093/* task state */
1094 struct linux_binfmt *binfmt;
William Cohen97dc32c2007-05-08 00:23:41 -07001095 int exit_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 int exit_code, exit_signal;
1097 int pdeath_signal; /* The signal sent when the parent dies */
1098 /* ??? */
William Cohen97dc32c2007-05-08 00:23:41 -07001099 unsigned int personality;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 unsigned did_exec:1;
1101 pid_t pid;
1102 pid_t tgid;
Arjan van de Ven0a425402006-09-26 10:52:38 +02001103
1104#ifdef CONFIG_CC_STACKPROTECTOR
1105 /* Canary value for the -fstack-protector gcc feature */
1106 unsigned long stack_canary;
1107#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 /*
1109 * pointers to (original) parent process, youngest child, younger sibling,
1110 * older sibling, respectively. (p->father can be replaced with
Roland McGrathf4700212008-03-24 18:36:23 -07001111 * p->real_parent->pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 */
Roland McGrathf4700212008-03-24 18:36:23 -07001113 struct task_struct *real_parent; /* real parent process */
1114 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 /*
Roland McGrathf4700212008-03-24 18:36:23 -07001116 * children/sibling forms the list of my natural children
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 */
1118 struct list_head children; /* list of my children */
1119 struct list_head sibling; /* linkage in my parent's children list */
1120 struct task_struct *group_leader; /* threadgroup leader */
1121
Roland McGrathf4700212008-03-24 18:36:23 -07001122 /*
1123 * ptraced is the list of tasks this task is using ptrace on.
1124 * This includes both natural children and PTRACE_ATTACH targets.
1125 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1126 */
1127 struct list_head ptraced;
1128 struct list_head ptrace_entry;
1129
Markus Metzgerca0002a2008-11-25 09:01:25 +01001130#ifdef CONFIG_X86_PTRACE_BTS
1131 /*
1132 * This is the tracer handle for the ptrace BTS extension.
1133 * This field actually belongs to the ptracer task.
1134 */
1135 struct bts_tracer *bts;
Markus Metzger6abb11a2008-11-25 09:05:27 +01001136 /*
1137 * The buffer to hold the BTS data.
1138 */
1139 void *bts_buffer;
Markus Metzgerc2724772008-12-11 13:49:59 +01001140 size_t bts_size;
Markus Metzgerca0002a2008-11-25 09:01:25 +01001141#endif /* CONFIG_X86_PTRACE_BTS */
1142
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 /* PID/PID hash table linkage. */
Eric W. Biederman92476d72006-03-31 02:31:42 -08001144 struct pid_link pids[PIDTYPE_MAX];
Oleg Nesterov47e65322006-03-28 16:11:25 -08001145 struct list_head thread_group;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146
1147 struct completion *vfork_done; /* for vfork() */
1148 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1149 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1150
Michael Neulingc66f08b2007-10-18 03:06:34 -07001151 cputime_t utime, stime, utimescaled, stimescaled;
Laurent Vivier9ac52312007-10-15 17:00:19 +02001152 cputime_t gtime;
Balbir Singh93018992007-10-30 00:26:32 +01001153 cputime_t prev_utime, prev_stime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 unsigned long nvcsw, nivcsw; /* context switch counts */
Tomas Janousek924b42d2007-07-15 23:39:42 -07001155 struct timespec start_time; /* monotonic time */
1156 struct timespec real_start_time; /* boot based time */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1158 unsigned long min_flt, maj_flt;
1159
Frank Mayharf06febc2008-09-12 09:54:39 -07001160 struct task_cputime cputime_expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 struct list_head cpu_timers[3];
1162
1163/* process credentials */
David Howells3b11a1d2008-11-14 10:39:26 +11001164 const struct cred *real_cred; /* objective and real subjective task
1165 * credentials (COW) */
1166 const struct cred *cred; /* effective (overridable) subjective task
1167 * credentials (COW) */
David Howellsd84f4f92008-11-14 10:39:23 +11001168 struct mutex cred_exec_mutex; /* execve vs ptrace cred calculation mutex */
David Howellsb6dff3e2008-11-14 10:39:16 +11001169
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -07001170 char comm[TASK_COMM_LEN]; /* executable name excluding path
1171 - access with [gs]et_task_comm (which lock
1172 it with task_lock())
1173 - initialized normally by flush_old_exec */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174/* file system info */
1175 int link_count, total_link_count;
Alexey Dobriyan3d5b6fc2006-09-29 01:59:40 -07001176#ifdef CONFIG_SYSVIPC
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177/* ipc stuff */
1178 struct sysv_sem sysvsem;
Alexey Dobriyan3d5b6fc2006-09-29 01:59:40 -07001179#endif
Ingo Molnar82a1fcb2008-01-25 21:08:02 +01001180#ifdef CONFIG_DETECT_SOFTLOCKUP
1181/* hung task detection */
1182 unsigned long last_switch_timestamp;
1183 unsigned long last_switch_count;
1184#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185/* CPU-specific state of this task */
1186 struct thread_struct thread;
1187/* filesystem information */
1188 struct fs_struct *fs;
1189/* open file information */
1190 struct files_struct *files;
Serge E. Hallyn1651e142006-10-02 02:18:08 -07001191/* namespaces */
Serge E. Hallynab516012006-10-02 02:18:06 -07001192 struct nsproxy *nsproxy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193/* signal handlers */
1194 struct signal_struct *signal;
1195 struct sighand_struct *sighand;
1196
1197 sigset_t blocked, real_blocked;
Roland McGrathf3de2722008-04-30 00:53:09 -07001198 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 struct sigpending pending;
1200
1201 unsigned long sas_ss_sp;
1202 size_t sas_ss_size;
1203 int (*notifier)(void *priv);
1204 void *notifier_data;
1205 sigset_t *notifier_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 struct audit_context *audit_context;
Al Virobfef93a2008-01-10 04:53:18 -05001207#ifdef CONFIG_AUDITSYSCALL
1208 uid_t loginuid;
Eric Paris4746ec52008-01-08 10:06:53 -05001209 unsigned int sessionid;
Al Virobfef93a2008-01-10 04:53:18 -05001210#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 seccomp_t seccomp;
1212
1213/* Thread group tracking */
1214 u32 parent_exec_id;
1215 u32 self_exec_id;
1216/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1217 spinlock_t alloc_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218
Ingo Molnarb29739f2006-06-27 02:54:51 -07001219 /* Protection of the PI data structures: */
1220 spinlock_t pi_lock;
1221
Ingo Molnar23f78d42006-06-27 02:54:53 -07001222#ifdef CONFIG_RT_MUTEXES
1223 /* PI waiters blocked on a rt_mutex held by this task */
1224 struct plist_head pi_waiters;
1225 /* Deadlock detection and priority inheritance handling */
1226 struct rt_mutex_waiter *pi_blocked_on;
Ingo Molnar23f78d42006-06-27 02:54:53 -07001227#endif
1228
Ingo Molnar408894e2006-01-09 15:59:20 -08001229#ifdef CONFIG_DEBUG_MUTEXES
1230 /* mutex deadlock detection */
1231 struct mutex_waiter *blocked_on;
1232#endif
Ingo Molnarde30a2b2006-07-03 00:24:42 -07001233#ifdef CONFIG_TRACE_IRQFLAGS
1234 unsigned int irq_events;
1235 int hardirqs_enabled;
1236 unsigned long hardirq_enable_ip;
1237 unsigned int hardirq_enable_event;
1238 unsigned long hardirq_disable_ip;
1239 unsigned int hardirq_disable_event;
1240 int softirqs_enabled;
1241 unsigned long softirq_disable_ip;
1242 unsigned int softirq_disable_event;
1243 unsigned long softirq_enable_ip;
1244 unsigned int softirq_enable_event;
1245 int hardirq_context;
1246 int softirq_context;
1247#endif
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001248#ifdef CONFIG_LOCKDEP
Peter Zijlstrabdb94412008-02-25 23:02:48 +01001249# define MAX_LOCK_DEPTH 48UL
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001250 u64 curr_chain_key;
1251 int lockdep_depth;
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001252 unsigned int lockdep_recursion;
Richard Kennedyc7aceab2008-05-15 12:09:15 +01001253 struct held_lock held_locks[MAX_LOCK_DEPTH];
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001254#endif
Ingo Molnar408894e2006-01-09 15:59:20 -08001255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256/* journalling filesystem info */
1257 void *journal_info;
1258
Neil Brownd89d8792007-05-01 09:53:42 +02001259/* stacked block device info */
1260 struct bio *bio_list, **bio_tail;
1261
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262/* VM state */
1263 struct reclaim_state *reclaim_state;
1264
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 struct backing_dev_info *backing_dev_info;
1266
1267 struct io_context *io_context;
1268
1269 unsigned long ptrace_message;
1270 siginfo_t *last_siginfo; /* For ptrace use. */
Andrea Righi940389b2008-07-28 00:48:12 +02001271 struct task_io_accounting ioac;
Jay Lan8f0ab512006-09-30 23:28:59 -07001272#if defined(CONFIG_TASK_XACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 u64 acct_rss_mem1; /* accumulated rss usage */
1274 u64 acct_vm_mem1; /* accumulated virtual memory usage */
Jonathan Lim49b5cf32008-07-25 01:48:40 -07001275 cputime_t acct_timexpd; /* stime + utime since last update */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277#ifdef CONFIG_CPUSETS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 nodemask_t mems_allowed;
1279 int cpuset_mems_generation;
Paul Jackson825a46a2006-03-24 03:16:03 -08001280 int cpuset_mem_spread_rotor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281#endif
Paul Menageddbcc7e2007-10-18 23:39:30 -07001282#ifdef CONFIG_CGROUPS
Paul Menage817929e2007-10-18 23:39:36 -07001283 /* Control Group info protected by css_set_lock */
1284 struct css_set *cgroups;
1285 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1286 struct list_head cg_list;
Paul Menageddbcc7e2007-10-18 23:39:30 -07001287#endif
Alexey Dobriyan42b2dd02007-10-16 23:27:30 -07001288#ifdef CONFIG_FUTEX
Ingo Molnar0771dfe2006-03-27 01:16:22 -08001289 struct robust_list_head __user *robust_list;
Ingo Molnar34f192c2006-03-27 01:16:24 -08001290#ifdef CONFIG_COMPAT
1291 struct compat_robust_list_head __user *compat_robust_list;
1292#endif
Ingo Molnarc87e2832006-06-27 02:54:58 -07001293 struct list_head pi_state_list;
1294 struct futex_pi_state *pi_state_cache;
Alexey Dobriyan42b2dd02007-10-16 23:27:30 -07001295#endif
Richard Kennedyc7aceab2008-05-15 12:09:15 +01001296#ifdef CONFIG_NUMA
1297 struct mempolicy *mempolicy;
1298 short il_next;
1299#endif
Jens Axboe22e2c502005-06-27 10:55:12 +02001300 atomic_t fs_excl; /* holding fs exclusive resources */
Ingo Molnare56d0902006-01-08 01:01:37 -08001301 struct rcu_head rcu;
Jens Axboeb92ce552006-04-11 13:52:07 +02001302
1303 /*
1304 * cache last used pipe for splice
1305 */
1306 struct pipe_inode_info *splice_pipe;
Shailabh Nagarca74e922006-07-14 00:24:36 -07001307#ifdef CONFIG_TASK_DELAY_ACCT
1308 struct task_delay_info *delays;
1309#endif
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001310#ifdef CONFIG_FAULT_INJECTION
1311 int make_it_fail;
1312#endif
Peter Zijlstra3e26c142007-10-16 23:25:50 -07001313 struct prop_local_single dirties;
Arjan van de Ven97455122008-01-25 21:08:34 +01001314#ifdef CONFIG_LATENCYTOP
1315 int latency_record_count;
1316 struct latency_record latency_record[LT_SAVECOUNT];
1317#endif
Arjan van de Ven69766752008-09-01 15:52:40 -07001318 /*
1319 * time slack values; these are used to round up poll() and
1320 * select() etc timeout values. These are in nanoseconds.
1321 */
1322 unsigned long timer_slack_ns;
1323 unsigned long default_timer_slack_ns;
David Millerf8d570a2008-11-06 00:37:40 -08001324
1325 struct list_head *scm_work_list;
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001326#ifdef CONFIG_FUNCTION_GRAPH_TRACER
Frederic Weisbeckerf201ae22008-11-23 06:22:56 +01001327 /* Index of current stored adress in ret_stack */
1328 int curr_ret_stack;
1329 /* Stack of return addresses for return function tracing */
1330 struct ftrace_ret_stack *ret_stack;
1331 /*
1332 * Number of functions that haven't been traced
1333 * because of depth overrun.
1334 */
1335 atomic_t trace_overrun;
Frederic Weisbecker380c4b12008-12-06 03:43:41 +01001336 /* Pause for the tracing */
1337 atomic_t tracing_graph_pause;
Frederic Weisbeckerf201ae22008-11-23 06:22:56 +01001338#endif
Steven Rostedtea4e2bc2008-12-03 15:36:57 -05001339#ifdef CONFIG_TRACING
1340 /* state flags for use by tracers */
1341 unsigned long trace;
1342#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343};
1344
Ingo Molnare05606d2007-07-09 18:51:59 +02001345/*
1346 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1347 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1348 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1349 * values are inverted: lower p->prio value means higher priority.
1350 *
1351 * The MAX_USER_RT_PRIO value allows the actual maximum
1352 * RT priority to be separate from the value exported to
1353 * user-space. This allows kernel threads to set their
1354 * priority to a value higher than any user task. Note:
1355 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1356 */
1357
1358#define MAX_USER_RT_PRIO 100
1359#define MAX_RT_PRIO MAX_USER_RT_PRIO
1360
1361#define MAX_PRIO (MAX_RT_PRIO + 40)
1362#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1363
1364static inline int rt_prio(int prio)
1365{
1366 if (unlikely(prio < MAX_RT_PRIO))
1367 return 1;
1368 return 0;
1369}
1370
Alexey Dobriyane8681712007-10-26 12:17:22 +04001371static inline int rt_task(struct task_struct *p)
Ingo Molnare05606d2007-07-09 18:51:59 +02001372{
1373 return rt_prio(p->prio);
1374}
1375
Pavel Emelianova47afb02007-10-18 23:39:46 -07001376static inline void set_task_session(struct task_struct *tsk, pid_t session)
Cedric Le Goater937949d2006-12-08 02:37:54 -08001377{
Pavel Emelianova47afb02007-10-18 23:39:46 -07001378 tsk->signal->__session = session;
Cedric Le Goater937949d2006-12-08 02:37:54 -08001379}
1380
Pavel Emelyanov9a2e7052007-10-18 23:40:39 -07001381static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1382{
1383 tsk->signal->__pgrp = pgrp;
1384}
1385
Alexey Dobriyane8681712007-10-26 12:17:22 +04001386static inline struct pid *task_pid(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001387{
1388 return task->pids[PIDTYPE_PID].pid;
1389}
1390
Alexey Dobriyane8681712007-10-26 12:17:22 +04001391static inline struct pid *task_tgid(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001392{
1393 return task->group_leader->pids[PIDTYPE_PID].pid;
1394}
1395
Alexey Dobriyane8681712007-10-26 12:17:22 +04001396static inline struct pid *task_pgrp(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001397{
1398 return task->group_leader->pids[PIDTYPE_PGID].pid;
1399}
1400
Alexey Dobriyane8681712007-10-26 12:17:22 +04001401static inline struct pid *task_session(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001402{
1403 return task->group_leader->pids[PIDTYPE_SID].pid;
1404}
1405
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001406struct pid_namespace;
1407
1408/*
1409 * the helpers to get the task's different pids as they are seen
1410 * from various namespaces
1411 *
1412 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
Eric W. Biederman44c4e1b2008-02-08 04:19:15 -08001413 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1414 * current.
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001415 * task_xid_nr_ns() : id seen from the ns specified;
1416 *
1417 * set_task_vxid() : assigns a virtual id to a task;
1418 *
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001419 * see also pid_nr() etc in include/linux/pid.h
1420 */
1421
Alexey Dobriyane8681712007-10-26 12:17:22 +04001422static inline pid_t task_pid_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001423{
1424 return tsk->pid;
1425}
1426
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001427pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001428
1429static inline pid_t task_pid_vnr(struct task_struct *tsk)
1430{
1431 return pid_vnr(task_pid(tsk));
1432}
1433
1434
Alexey Dobriyane8681712007-10-26 12:17:22 +04001435static inline pid_t task_tgid_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001436{
1437 return tsk->tgid;
1438}
1439
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001440pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001441
1442static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1443{
1444 return pid_vnr(task_tgid(tsk));
1445}
1446
1447
Alexey Dobriyane8681712007-10-26 12:17:22 +04001448static inline pid_t task_pgrp_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001449{
Pavel Emelyanov9a2e7052007-10-18 23:40:39 -07001450 return tsk->signal->__pgrp;
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001451}
1452
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001453pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001454
1455static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1456{
1457 return pid_vnr(task_pgrp(tsk));
1458}
1459
1460
Alexey Dobriyane8681712007-10-26 12:17:22 +04001461static inline pid_t task_session_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001462{
1463 return tsk->signal->__session;
1464}
1465
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001466pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001467
1468static inline pid_t task_session_vnr(struct task_struct *tsk)
1469{
1470 return pid_vnr(task_session(tsk));
1471}
1472
1473
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474/**
1475 * pid_alive - check that a task structure is not stale
1476 * @p: Task structure to be checked.
1477 *
1478 * Test if a process is not yet dead (at most zombie state)
1479 * If pid_alive fails, then pointers within the task structure
1480 * can be stale and must not be dereferenced.
1481 */
Alexey Dobriyane8681712007-10-26 12:17:22 +04001482static inline int pid_alive(struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483{
Eric W. Biederman92476d72006-03-31 02:31:42 -08001484 return p->pids[PIDTYPE_PID].pid != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485}
1486
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001487/**
Serge E. Hallynb460cbc2007-10-18 23:39:52 -07001488 * is_global_init - check if a task structure is init
Henne32602592006-10-06 00:44:01 -07001489 * @tsk: Task structure to be checked.
1490 *
1491 * Check if a task structure is the first user space task the kernel created.
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001492 */
Alexey Dobriyane8681712007-10-26 12:17:22 +04001493static inline int is_global_init(struct task_struct *tsk)
Pavel Emelyanovb461cc02007-10-18 23:40:09 -07001494{
1495 return tsk->pid == 1;
1496}
Serge E. Hallynb460cbc2007-10-18 23:39:52 -07001497
1498/*
1499 * is_container_init:
1500 * check whether in the task is init in its own pid namespace.
1501 */
Pavel Emelyanovb461cc02007-10-18 23:40:09 -07001502extern int is_container_init(struct task_struct *tsk);
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001503
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001504extern struct pid *cad_pid;
1505
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506extern void free_task(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
Ingo Molnare56d0902006-01-08 01:01:37 -08001508
Andrew Morton158d9eb2006-03-31 02:31:34 -08001509extern void __put_task_struct(struct task_struct *t);
Ingo Molnare56d0902006-01-08 01:01:37 -08001510
1511static inline void put_task_struct(struct task_struct *t)
1512{
1513 if (atomic_dec_and_test(&t->usage))
Eric W. Biederman8c7904a2006-03-31 02:31:37 -08001514 __put_task_struct(t);
Ingo Molnare56d0902006-01-08 01:01:37 -08001515}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
Balbir Singh49048622008-09-05 18:12:23 +02001517extern cputime_t task_utime(struct task_struct *p);
1518extern cputime_t task_stime(struct task_struct *p);
1519extern cputime_t task_gtime(struct task_struct *p);
1520
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521/*
1522 * Per process flags
1523 */
1524#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1525 /* Not implemented yet, only for 486*/
1526#define PF_STARTING 0x00000002 /* being created */
1527#define PF_EXITING 0x00000004 /* getting shut down */
Alexey Kuznetsov778e9a92007-06-08 13:47:00 -07001528#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
Laurent Vivier94886b82007-10-15 17:00:19 +02001529#define PF_VCPU 0x00000010 /* I'm a virtual CPU */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1531#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1532#define PF_DUMPCORE 0x00000200 /* dumped core */
1533#define PF_SIGNALED 0x00000400 /* killed by a signal */
1534#define PF_MEMALLOC 0x00000800 /* Allocating memory */
1535#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1536#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1538#define PF_FROZEN 0x00010000 /* frozen for system suspend */
1539#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1540#define PF_KSWAPD 0x00040000 /* I am kswapd */
1541#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1542#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
Oleg Nesterov246bb0b2008-07-25 01:47:38 -07001543#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
Jens Axboeb31dc662006-06-13 08:26:10 +02001544#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1545#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1546#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1547#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
David Rientjes9985b0b2008-06-05 12:57:11 -07001548#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
Paul Jacksonc61afb12006-03-24 03:16:08 -08001549#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
Thomas Gleixner61a87122006-06-27 02:54:56 -07001550#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
Rafael J. Wysockiba96a0c2007-05-23 13:57:25 -07001551#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
Rafael J. Wysockiebb12db2008-06-11 22:04:29 +02001552#define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553
1554/*
1555 * Only the _current_ task can read/write to tsk->flags, but other
1556 * tasks can access tsk->flags in readonly mode for example
1557 * with tsk_used_math (like during threaded core dumping).
1558 * There is however an exception to this rule during ptrace
1559 * or during fork: the ptracer task is allowed to write to the
1560 * child->flags of its traced child (same goes for fork, the parent
1561 * can write to the child->flags), because we're guaranteed the
1562 * child is not running and in turn not changing child->flags
1563 * at the same time the parent does it.
1564 */
1565#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1566#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1567#define clear_used_math() clear_stopped_child_used_math(current)
1568#define set_used_math() set_stopped_child_used_math(current)
1569#define conditional_stopped_child_used_math(condition, child) \
1570 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1571#define conditional_used_math(condition) \
1572 conditional_stopped_child_used_math(condition, current)
1573#define copy_to_stopped_child_used_math(child) \
1574 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1575/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1576#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1577#define used_math() tsk_used_math(current)
1578
1579#ifdef CONFIG_SMP
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001580extern int set_cpus_allowed_ptr(struct task_struct *p,
1581 const cpumask_t *new_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582#else
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001583static inline int set_cpus_allowed_ptr(struct task_struct *p,
1584 const cpumask_t *new_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585{
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001586 if (!cpu_isset(0, *new_mask))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 return -EINVAL;
1588 return 0;
1589}
1590#endif
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001591static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1592{
1593 return set_cpus_allowed_ptr(p, &new_mask);
1594}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595
1596extern unsigned long long sched_clock(void);
Ingo Molnare436d802007-07-19 21:28:35 +02001597
Peter Zijlstrac1955a32008-08-11 08:59:03 +02001598extern void sched_clock_init(void);
1599extern u64 sched_clock_cpu(int cpu);
1600
Peter Zijlstra3e51f332008-05-03 18:29:28 +02001601#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
Peter Zijlstra3e51f332008-05-03 18:29:28 +02001602static inline void sched_clock_tick(void)
1603{
1604}
1605
1606static inline void sched_clock_idle_sleep_event(void)
1607{
1608}
1609
1610static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1611{
1612}
Ingo Molnare4e4e532008-04-14 08:50:02 +02001613#else
Peter Zijlstra3e51f332008-05-03 18:29:28 +02001614extern void sched_clock_tick(void);
1615extern void sched_clock_idle_sleep_event(void);
1616extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1617#endif
1618
Ingo Molnare436d802007-07-19 21:28:35 +02001619/*
1620 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1621 * clock constructed from sched_clock():
1622 */
1623extern unsigned long long cpu_clock(int cpu);
1624
Ingo Molnar36c8b582006-07-03 00:25:41 -07001625extern unsigned long long
Ingo Molnar41b86e92007-07-09 18:51:58 +02001626task_sched_runtime(struct task_struct *task);
Frank Mayharf06febc2008-09-12 09:54:39 -07001627extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628
1629/* sched_exec is called by processes performing an exec */
1630#ifdef CONFIG_SMP
1631extern void sched_exec(void);
1632#else
1633#define sched_exec() {}
1634#endif
1635
Ingo Molnar2aa44d02007-08-23 15:18:02 +02001636extern void sched_clock_idle_sleep_event(void);
1637extern void sched_clock_idle_wakeup_event(u64 delta_ns);
Ingo Molnarbb29ab22007-07-09 18:51:59 +02001638
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639#ifdef CONFIG_HOTPLUG_CPU
1640extern void idle_task_exit(void);
1641#else
1642static inline void idle_task_exit(void) {}
1643#endif
1644
1645extern void sched_idle_next(void);
Ingo Molnarb29739f2006-06-27 02:54:51 -07001646
Thomas Gleixner06d83082008-03-22 09:20:24 +01001647#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1648extern void wake_up_idle_cpu(int cpu);
1649#else
1650static inline void wake_up_idle_cpu(int cpu) { }
1651#endif
1652
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001653#ifdef CONFIG_SCHED_DEBUG
Peter Zijlstra21805082007-08-25 18:41:53 +02001654extern unsigned int sysctl_sched_latency;
Peter Zijlstrab2be5e92007-11-09 22:39:37 +01001655extern unsigned int sysctl_sched_min_granularity;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001656extern unsigned int sysctl_sched_wakeup_granularity;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001657extern unsigned int sysctl_sched_child_runs_first;
1658extern unsigned int sysctl_sched_features;
Ingo Molnarda84d962007-10-15 17:00:18 +02001659extern unsigned int sysctl_sched_migration_cost;
Peter Zijlstrab82d9fd2007-11-09 22:39:39 +01001660extern unsigned int sysctl_sched_nr_migrate;
Peter Zijlstra2398f2c2008-06-27 13:41:35 +02001661extern unsigned int sysctl_sched_shares_ratelimit;
Peter Zijlstraffda12a2008-10-17 19:27:02 +02001662extern unsigned int sysctl_sched_shares_thresh;
Peter Zijlstrab2be5e92007-11-09 22:39:37 +01001663
1664int sched_nr_latency_handler(struct ctl_table *table, int write,
1665 struct file *file, void __user *buffer, size_t *length,
1666 loff_t *ppos);
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001667#endif
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +01001668extern unsigned int sysctl_sched_rt_period;
1669extern int sysctl_sched_rt_runtime;
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001670
Peter Zijlstrad0b27fa2008-04-19 19:44:57 +02001671int sched_rt_handler(struct ctl_table *table, int write,
1672 struct file *filp, void __user *buffer, size_t *lenp,
1673 loff_t *ppos);
1674
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001675extern unsigned int sysctl_sched_compat_yield;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001676
Ingo Molnarb29739f2006-06-27 02:54:51 -07001677#ifdef CONFIG_RT_MUTEXES
Ingo Molnar36c8b582006-07-03 00:25:41 -07001678extern int rt_mutex_getprio(struct task_struct *p);
1679extern void rt_mutex_setprio(struct task_struct *p, int prio);
1680extern void rt_mutex_adjust_pi(struct task_struct *p);
Ingo Molnarb29739f2006-06-27 02:54:51 -07001681#else
Alexey Dobriyane8681712007-10-26 12:17:22 +04001682static inline int rt_mutex_getprio(struct task_struct *p)
Ingo Molnarb29739f2006-06-27 02:54:51 -07001683{
1684 return p->normal_prio;
1685}
Thomas Gleixner95e02ca2006-06-27 02:55:02 -07001686# define rt_mutex_adjust_pi(p) do { } while (0)
Ingo Molnarb29739f2006-06-27 02:54:51 -07001687#endif
1688
Ingo Molnar36c8b582006-07-03 00:25:41 -07001689extern void set_user_nice(struct task_struct *p, long nice);
1690extern int task_prio(const struct task_struct *p);
1691extern int task_nice(const struct task_struct *p);
1692extern int can_nice(const struct task_struct *p, const int nice);
1693extern int task_curr(const struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694extern int idle_cpu(int cpu);
1695extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
Rusty Russell961ccdd2008-06-23 13:55:38 +10001696extern int sched_setscheduler_nocheck(struct task_struct *, int,
1697 struct sched_param *);
Ingo Molnar36c8b582006-07-03 00:25:41 -07001698extern struct task_struct *idle_task(int cpu);
1699extern struct task_struct *curr_task(int cpu);
1700extern void set_curr_task(int cpu, struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701
1702void yield(void);
1703
1704/*
1705 * The default (Linux) execution domain.
1706 */
1707extern struct exec_domain default_exec_domain;
1708
1709union thread_union {
1710 struct thread_info thread_info;
1711 unsigned long stack[THREAD_SIZE/sizeof(long)];
1712};
1713
1714#ifndef __HAVE_ARCH_KSTACK_END
1715static inline int kstack_end(void *addr)
1716{
1717 /* Reliable end of stack detection:
1718 * Some APM bios versions misalign the stack
1719 */
1720 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1721}
1722#endif
1723
1724extern union thread_union init_thread_union;
1725extern struct task_struct init_task;
1726
1727extern struct mm_struct init_mm;
1728
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001729extern struct pid_namespace init_pid_ns;
1730
1731/*
1732 * find a task by one of its numerical ids
1733 *
1734 * find_task_by_pid_type_ns():
1735 * it is the most generic call - it finds a task by all id,
1736 * type and namespace specified
1737 * find_task_by_pid_ns():
1738 * finds a task by its pid in the specified namespace
Pavel Emelyanov228ebcb2007-10-18 23:40:16 -07001739 * find_task_by_vpid():
1740 * finds a task by its virtual pid
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001741 *
Pavel Emelyanove49859e2008-07-25 01:48:36 -07001742 * see also find_vpid() etc in include/linux/pid.h
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001743 */
1744
1745extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1746 struct pid_namespace *ns);
1747
Pavel Emelyanov228ebcb2007-10-18 23:40:16 -07001748extern struct task_struct *find_task_by_vpid(pid_t nr);
1749extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1750 struct pid_namespace *ns);
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001751
Oleg Nesterov8520d7c2008-02-08 04:19:09 -08001752extern void __set_special_pids(struct pid *pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753
1754/* per-UID process charging. */
Cedric Le Goateracce2922007-07-15 23:40:59 -07001755extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756static inline struct user_struct *get_uid(struct user_struct *u)
1757{
1758 atomic_inc(&u->__count);
1759 return u;
1760}
1761extern void free_uid(struct user_struct *);
Pavel Emelyanov28f300d2007-09-18 22:46:45 -07001762extern void release_uids(struct user_namespace *ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763
1764#include <asm/current.h>
1765
Atsushi Nemoto3171a032006-09-29 02:00:32 -07001766extern void do_timer(unsigned long ticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767
Harvey Harrisonb3c97522008-02-13 15:03:15 -08001768extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1769extern int wake_up_process(struct task_struct *tsk);
1770extern void wake_up_new_task(struct task_struct *tsk,
1771 unsigned long clone_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772#ifdef CONFIG_SMP
1773 extern void kick_process(struct task_struct *tsk);
1774#else
1775 static inline void kick_process(struct task_struct *tsk) { }
1776#endif
Ingo Molnarad46c2c2007-07-09 18:52:00 +02001777extern void sched_fork(struct task_struct *p, int clone_flags);
1778extern void sched_dead(struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001779
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780extern void proc_caches_init(void);
1781extern void flush_signals(struct task_struct *);
Oleg Nesterov10ab8252007-05-09 02:34:37 -07001782extern void ignore_signals(struct task_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783extern void flush_signal_handlers(struct task_struct *, int force_default);
1784extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1785
1786static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1787{
1788 unsigned long flags;
1789 int ret;
1790
1791 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1792 ret = dequeue_signal(tsk, mask, info);
1793 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1794
1795 return ret;
1796}
1797
1798extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1799 sigset_t *mask);
1800extern void unblock_all_signals(void);
1801extern void release_task(struct task_struct * p);
1802extern int send_sig_info(int, struct siginfo *, struct task_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803extern int force_sigsegv(int, struct task_struct *);
1804extern int force_sig_info(int, struct siginfo *, struct task_struct *);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001805extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001806extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
Eric W. Biederman2425c082006-10-02 02:17:28 -07001807extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001808extern int kill_pgrp(struct pid *pid, int sig, int priv);
1809extern int kill_pid(struct pid *pid, int sig, int priv);
Matthew Wilcoxc3de4b32007-02-09 08:11:47 -07001810extern int kill_proc_info(int, struct siginfo *, pid_t);
Roland McGrath2b2a1ff2008-07-25 19:45:54 -07001811extern int do_notify_parent(struct task_struct *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812extern void force_sig(int, struct task_struct *);
1813extern void force_sig_specific(int, struct task_struct *);
1814extern int send_sig(int, struct task_struct *, int);
1815extern void zap_other_threads(struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816extern struct sigqueue *sigqueue_alloc(void);
1817extern void sigqueue_free(struct sigqueue *);
Oleg Nesterovac5c2152008-04-30 00:52:57 -07001818extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
Oleg Nesterov9ac95f22006-02-09 22:41:50 +03001819extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1821
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001822static inline int kill_cad_pid(int sig, int priv)
1823{
1824 return kill_pid(cad_pid, sig, priv);
1825}
1826
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827/* These can be the second arg to send_sig_info/send_group_sig_info. */
1828#define SEND_SIG_NOINFO ((struct siginfo *) 0)
1829#define SEND_SIG_PRIV ((struct siginfo *) 1)
1830#define SEND_SIG_FORCED ((struct siginfo *) 2)
1831
Oleg Nesterov621d3122005-10-30 15:03:45 -08001832static inline int is_si_special(const struct siginfo *info)
1833{
1834 return info <= SEND_SIG_FORCED;
1835}
1836
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837/* True if we are on the alternate signal stack. */
1838
1839static inline int on_sig_stack(unsigned long sp)
1840{
1841 return (sp - current->sas_ss_sp < current->sas_ss_size);
1842}
1843
1844static inline int sas_ss_flags(unsigned long sp)
1845{
1846 return (current->sas_ss_size == 0 ? SS_DISABLE
1847 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1848}
1849
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850/*
1851 * Routines for handling mm_structs
1852 */
1853extern struct mm_struct * mm_alloc(void);
1854
1855/* mmdrop drops the mm and the page tables */
Harvey Harrisonb3c97522008-02-13 15:03:15 -08001856extern void __mmdrop(struct mm_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857static inline void mmdrop(struct mm_struct * mm)
1858{
Ingo Molnar6fb43d72007-07-09 18:52:01 +02001859 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 __mmdrop(mm);
1861}
1862
1863/* mmput gets rid of the mappings and all user-space */
1864extern void mmput(struct mm_struct *);
1865/* Grab a reference to a task's mm, if it is not already going away */
1866extern struct mm_struct *get_task_mm(struct task_struct *task);
1867/* Remove the current tasks stale references to the old mm_struct */
1868extern void mm_release(struct task_struct *, struct mm_struct *);
Carsten Otte402b0862008-03-25 18:47:10 +01001869/* Allocate a new mm structure and copy contents from tsk->mm */
1870extern struct mm_struct *dup_mm(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871
1872extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1873extern void flush_thread(void);
1874extern void exit_thread(void);
1875
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876extern void exit_files(struct task_struct *);
Oleg Nesterov6b3934e2006-03-28 16:11:16 -08001877extern void __cleanup_signal(struct signal_struct *);
Oleg Nesterova7e53282006-03-28 16:11:27 -08001878extern void __cleanup_sighand(struct sighand_struct *);
Oleg Nesterovcbaffba2008-05-26 20:55:42 +04001879
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880extern void exit_itimers(struct signal_struct *);
Oleg Nesterovcbaffba2008-05-26 20:55:42 +04001881extern void flush_itimer_signals(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882
1883extern NORET_TYPE void do_group_exit(int);
1884
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885extern void daemonize(const char *, ...);
1886extern int allow_signal(int);
1887extern int disallow_signal(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888
1889extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1890extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
Ingo Molnar36c8b582006-07-03 00:25:41 -07001891struct task_struct *fork_idle(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892
1893extern void set_task_comm(struct task_struct *tsk, char *from);
Andrew Morton59714d62008-02-04 22:27:21 -08001894extern char *get_task_comm(char *to, struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895
1896#ifdef CONFIG_SMP
Roland McGrath85ba2d82008-07-25 19:45:58 -07001897extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898#else
Roland McGrath85ba2d82008-07-25 19:45:58 -07001899static inline unsigned long wait_task_inactive(struct task_struct *p,
1900 long match_state)
1901{
1902 return 1;
1903}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904#endif
1905
Eric W. Biederman5e85d4a2006-04-18 22:20:16 -07001906#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907
1908#define for_each_process(p) \
1909 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1910
David Howellsd84f4f92008-11-14 10:39:23 +11001911extern bool is_single_threaded(struct task_struct *);
1912
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913/*
1914 * Careful: do_each_thread/while_each_thread is a double loop so
1915 * 'break' will not work as expected - use goto instead.
1916 */
1917#define do_each_thread(g, t) \
1918 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1919
1920#define while_each_thread(g, t) \
1921 while ((t = next_thread(t)) != g)
1922
Eric W. Biedermande12a782006-04-10 17:16:49 -06001923/* de_thread depends on thread_group_leader not being a pid based check */
1924#define thread_group_leader(p) (p == p->group_leader)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925
Eric W. Biederman0804ef42006-10-02 02:17:04 -07001926/* Do to the insanities of de_thread it is possible for a process
1927 * to have the pid of the thread group leader without actually being
1928 * the thread group leader. For iteration through the pids in proc
1929 * all we care about is that we have a task with the appropriate
1930 * pid, we don't actually care if we have the right task.
1931 */
Alexey Dobriyane8681712007-10-26 12:17:22 +04001932static inline int has_group_leader_pid(struct task_struct *p)
Eric W. Biederman0804ef42006-10-02 02:17:04 -07001933{
1934 return p->pid == p->tgid;
1935}
1936
Pavel Emelyanovbac0abd2007-10-18 23:40:18 -07001937static inline
1938int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1939{
1940 return p1->tgid == p2->tgid;
1941}
1942
Ingo Molnar36c8b582006-07-03 00:25:41 -07001943static inline struct task_struct *next_thread(const struct task_struct *p)
Oleg Nesterov47e65322006-03-28 16:11:25 -08001944{
1945 return list_entry(rcu_dereference(p->thread_group.next),
Ingo Molnar36c8b582006-07-03 00:25:41 -07001946 struct task_struct, thread_group);
Oleg Nesterov47e65322006-03-28 16:11:25 -08001947}
1948
Alexey Dobriyane8681712007-10-26 12:17:22 +04001949static inline int thread_group_empty(struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950{
Oleg Nesterov47e65322006-03-28 16:11:25 -08001951 return list_empty(&p->thread_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952}
1953
1954#define delay_group_leader(p) \
1955 (thread_group_leader(p) && !thread_group_empty(p))
1956
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957/*
Eric W. Biederman260ea102006-06-23 02:05:18 -07001958 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
Jens Axboe22e2c502005-06-27 10:55:12 +02001959 * subscriptions and synchronises with wait4(). Also used in procfs. Also
Paul Menageddbcc7e2007-10-18 23:39:30 -07001960 * pins the final release of task.io_context. Also protects ->cpuset and
1961 * ->cgroup.subsys[].
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 *
1963 * Nests both inside and outside of read_lock(&tasklist_lock).
1964 * It must not be nested with write_lock_irq(&tasklist_lock),
1965 * neither inside nor outside.
1966 */
1967static inline void task_lock(struct task_struct *p)
1968{
1969 spin_lock(&p->alloc_lock);
1970}
1971
1972static inline void task_unlock(struct task_struct *p)
1973{
1974 spin_unlock(&p->alloc_lock);
1975}
1976
Oleg Nesterovf63ee722006-03-28 16:11:13 -08001977extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1978 unsigned long *flags);
1979
1980static inline void unlock_task_sighand(struct task_struct *tsk,
1981 unsigned long *flags)
1982{
1983 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1984}
1985
Al Virof0373602005-11-13 16:06:57 -08001986#ifndef __HAVE_THREAD_FUNCTIONS
1987
Roman Zippelf7e42172007-05-09 02:35:17 -07001988#define task_thread_info(task) ((struct thread_info *)(task)->stack)
1989#define task_stack_page(task) ((task)->stack)
Al Viroa1261f52005-11-13 16:06:55 -08001990
Al Viro10ebffd2005-11-13 16:06:56 -08001991static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1992{
1993 *task_thread_info(p) = *task_thread_info(org);
1994 task_thread_info(p)->task = p;
1995}
1996
1997static inline unsigned long *end_of_stack(struct task_struct *p)
1998{
Roman Zippelf7e42172007-05-09 02:35:17 -07001999 return (unsigned long *)(task_thread_info(p) + 1);
Al Viro10ebffd2005-11-13 16:06:56 -08002000}
2001
Al Virof0373602005-11-13 16:06:57 -08002002#endif
2003
FUJITA Tomonori8b05c7e2008-07-23 21:26:53 -07002004static inline int object_is_on_stack(void *obj)
2005{
2006 void *stack = task_stack_page(current);
2007
2008 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2009}
2010
Benjamin Herrenschmidt8c9843e2008-04-18 16:56:15 +10002011extern void thread_info_cache_init(void);
2012
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013/* set thread flags in other task's structures
2014 * - see asm/thread_info.h for TIF_xxxx flags available
2015 */
2016static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2017{
Al Viroa1261f52005-11-13 16:06:55 -08002018 set_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019}
2020
2021static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2022{
Al Viroa1261f52005-11-13 16:06:55 -08002023 clear_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002024}
2025
2026static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2027{
Al Viroa1261f52005-11-13 16:06:55 -08002028 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029}
2030
2031static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2032{
Al Viroa1261f52005-11-13 16:06:55 -08002033 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034}
2035
2036static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2037{
Al Viroa1261f52005-11-13 16:06:55 -08002038 return test_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002039}
2040
2041static inline void set_tsk_need_resched(struct task_struct *tsk)
2042{
2043 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2044}
2045
2046static inline void clear_tsk_need_resched(struct task_struct *tsk)
2047{
2048 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2049}
2050
Gregory Haskins8ae121a2008-04-23 07:13:29 -04002051static inline int test_tsk_need_resched(struct task_struct *tsk)
2052{
2053 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2054}
2055
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056static inline int signal_pending(struct task_struct *p)
2057{
2058 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2059}
Matthew Wilcoxf776d122007-12-06 11:15:50 -05002060
Harvey Harrisonb3c97522008-02-13 15:03:15 -08002061extern int __fatal_signal_pending(struct task_struct *p);
Matthew Wilcoxf776d122007-12-06 11:15:50 -05002062
2063static inline int fatal_signal_pending(struct task_struct *p)
2064{
2065 return signal_pending(p) && __fatal_signal_pending(p);
2066}
2067
Oleg Nesterov16882c12008-06-08 21:20:41 +04002068static inline int signal_pending_state(long state, struct task_struct *p)
2069{
2070 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2071 return 0;
2072 if (!signal_pending(p))
2073 return 0;
2074
Oleg Nesterov16882c12008-06-08 21:20:41 +04002075 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2076}
2077
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078static inline int need_resched(void)
2079{
Linus Torvalds9404ef02008-05-12 10:14:22 -07002080 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081}
2082
2083/*
2084 * cond_resched() and cond_resched_lock(): latency reduction via
2085 * explicit rescheduling in places that are safe. The return
2086 * value indicates whether a reschedule was done in fact.
2087 * cond_resched_lock() will drop the spinlock before scheduling,
2088 * cond_resched_softirq() will enable bhs before scheduling.
2089 */
Linus Torvaldsc3921ab2008-05-11 16:04:48 -07002090extern int _cond_resched(void);
Linus Torvaldsc714a532008-05-12 13:34:13 -07002091#ifdef CONFIG_PREEMPT_BKL
Herbert Xu02b67cc2008-01-25 21:08:28 +01002092static inline int cond_resched(void)
2093{
2094 return 0;
2095}
2096#else
Herbert Xu02b67cc2008-01-25 21:08:28 +01002097static inline int cond_resched(void)
2098{
2099 return _cond_resched();
2100}
2101#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102extern int cond_resched_lock(spinlock_t * lock);
2103extern int cond_resched_softirq(void);
Linus Torvaldsc3921ab2008-05-11 16:04:48 -07002104static inline int cond_resched_bkl(void)
2105{
2106 return _cond_resched();
2107}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108
2109/*
2110 * Does a critical section need to be broken due to another
Nick Piggin95c354f2008-01-30 13:31:20 +01002111 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2112 * but a general need for low latency)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002113 */
Nick Piggin95c354f2008-01-30 13:31:20 +01002114static inline int spin_needbreak(spinlock_t *lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115{
Nick Piggin95c354f2008-01-30 13:31:20 +01002116#ifdef CONFIG_PREEMPT
2117 return spin_is_contended(lock);
2118#else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119 return 0;
Nick Piggin95c354f2008-01-30 13:31:20 +01002120#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002121}
2122
Roland McGrath7bb44ad2007-05-23 13:57:44 -07002123/*
Frank Mayharf06febc2008-09-12 09:54:39 -07002124 * Thread group CPU time accounting.
2125 */
Frank Mayharf06febc2008-09-12 09:54:39 -07002126
Frank Mayharbb34d922008-09-12 09:54:39 -07002127extern int thread_group_cputime_alloc(struct task_struct *);
2128extern void thread_group_cputime(struct task_struct *, struct task_cputime *);
Frank Mayharf06febc2008-09-12 09:54:39 -07002129
2130static inline void thread_group_cputime_init(struct signal_struct *sig)
2131{
2132 sig->cputime.totals = NULL;
2133}
2134
Frank Mayharbb34d922008-09-12 09:54:39 -07002135static inline int thread_group_cputime_clone_thread(struct task_struct *curr)
Frank Mayharf06febc2008-09-12 09:54:39 -07002136{
2137 if (curr->signal->cputime.totals)
2138 return 0;
Frank Mayharbb34d922008-09-12 09:54:39 -07002139 return thread_group_cputime_alloc(curr);
Frank Mayharf06febc2008-09-12 09:54:39 -07002140}
2141
2142static inline void thread_group_cputime_free(struct signal_struct *sig)
2143{
2144 free_percpu(sig->cputime.totals);
2145}
2146
Frank Mayharf06febc2008-09-12 09:54:39 -07002147/*
Roland McGrath7bb44ad2007-05-23 13:57:44 -07002148 * Reevaluate whether the task has signals pending delivery.
2149 * Wake the task if so.
2150 * This is required every time the blocked sigset_t changes.
2151 * callers must hold sighand->siglock.
2152 */
2153extern void recalc_sigpending_and_wake(struct task_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154extern void recalc_sigpending(void);
2155
2156extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2157
2158/*
2159 * Wrappers for p->thread_info->cpu access. No-op on UP.
2160 */
2161#ifdef CONFIG_SMP
2162
2163static inline unsigned int task_cpu(const struct task_struct *p)
2164{
Al Viroa1261f52005-11-13 16:06:55 -08002165 return task_thread_info(p)->cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166}
2167
Ingo Molnarc65cc872007-07-09 18:51:58 +02002168extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169
2170#else
2171
2172static inline unsigned int task_cpu(const struct task_struct *p)
2173{
2174 return 0;
2175}
2176
2177static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2178{
2179}
2180
2181#endif /* CONFIG_SMP */
2182
Linus Torvalds1da177e2005-04-16 15:20:36 -07002183extern void arch_pick_mmap_layout(struct mm_struct *mm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002184
Ingo Molnar1a3c3032008-05-12 21:20:52 +02002185#ifdef CONFIG_TRACING
2186extern void
2187__trace_special(void *__tr, void *__data,
2188 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2189#else
2190static inline void
2191__trace_special(void *__tr, void *__data,
2192 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2193{
2194}
2195#endif
2196
Mike Travisb53e9212008-04-04 18:11:08 -07002197extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002198extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
2199
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -07002200extern int sched_mc_power_savings, sched_smt_power_savings;
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -07002201
Linus Torvalds1da177e2005-04-16 15:20:36 -07002202extern void normalize_rt_tasks(void);
2203
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002204#ifdef CONFIG_GROUP_SCHED
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002205
Ingo Molnar4cf86d72007-10-15 17:00:14 +02002206extern struct task_group init_task_group;
Peter Zijlstraeff766a2008-04-19 19:45:00 +02002207#ifdef CONFIG_USER_SCHED
2208extern struct task_group root_task_group;
Arun R Bharadwaj6c415b92008-12-01 20:49:05 +05302209extern void set_tg_uid(struct user_struct *user);
Peter Zijlstraeff766a2008-04-19 19:45:00 +02002210#endif
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002211
Dhaval Gianiec7dc8a2008-04-19 19:44:59 +02002212extern struct task_group *sched_create_group(struct task_group *parent);
Ingo Molnar4cf86d72007-10-15 17:00:14 +02002213extern void sched_destroy_group(struct task_group *tg);
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002214extern void sched_move_task(struct task_struct *tsk);
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002215#ifdef CONFIG_FAIR_GROUP_SCHED
Ingo Molnar4cf86d72007-10-15 17:00:14 +02002216extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
Dhaval Giani5cb350b2007-10-15 17:00:14 +02002217extern unsigned long sched_group_shares(struct task_group *tg);
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002218#endif
2219#ifdef CONFIG_RT_GROUP_SCHED
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +01002220extern int sched_group_set_rt_runtime(struct task_group *tg,
2221 long rt_runtime_us);
2222extern long sched_group_rt_runtime(struct task_group *tg);
Peter Zijlstrad0b27fa2008-04-19 19:44:57 +02002223extern int sched_group_set_rt_period(struct task_group *tg,
2224 long rt_period_us);
2225extern long sched_group_rt_period(struct task_group *tg);
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002226#endif
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002227#endif
2228
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08002229#ifdef CONFIG_TASK_XACCT
2230static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2231{
Andrea Righi940389b2008-07-28 00:48:12 +02002232 tsk->ioac.rchar += amt;
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08002233}
2234
2235static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2236{
Andrea Righi940389b2008-07-28 00:48:12 +02002237 tsk->ioac.wchar += amt;
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08002238}
2239
2240static inline void inc_syscr(struct task_struct *tsk)
2241{
Andrea Righi940389b2008-07-28 00:48:12 +02002242 tsk->ioac.syscr++;
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08002243}
2244
2245static inline void inc_syscw(struct task_struct *tsk)
2246{
Andrea Righi940389b2008-07-28 00:48:12 +02002247 tsk->ioac.syscw++;
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08002248}
2249#else
2250static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2251{
2252}
2253
2254static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2255{
2256}
2257
2258static inline void inc_syscr(struct task_struct *tsk)
2259{
2260}
2261
2262static inline void inc_syscw(struct task_struct *tsk)
2263{
2264}
2265#endif
2266
Dave Hansen82455252008-02-04 22:28:59 -08002267#ifndef TASK_SIZE_OF
2268#define TASK_SIZE_OF(tsk) TASK_SIZE
2269#endif
2270
Balbir Singhcf475ad2008-04-29 01:00:16 -07002271#ifdef CONFIG_MM_OWNER
2272extern void mm_update_next_owner(struct mm_struct *mm);
2273extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2274#else
2275static inline void mm_update_next_owner(struct mm_struct *mm)
2276{
2277}
2278
2279static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2280{
2281}
2282#endif /* CONFIG_MM_OWNER */
2283
Steven Rostedt7c731e02008-05-12 21:20:41 +02002284#define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2285
Linus Torvalds1da177e2005-04-16 15:20:36 -07002286#endif /* __KERNEL__ */
2287
2288#endif