blob: 182da1550fad541f6a09f4fae4bff961d1c8cccf [file] [log] [blame]
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 Molnar23f78d4a2006-06-27 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 Woodhousea3b67142006-04-25 14:54:40 +010090
91#include <asm/processor.h>
H. J. Lu36d57ac2005-09-06 15:16:49 -070092
Pavel Emelianov78fb7462008-02-07 00:13:51 -080093struct mem_cgroup;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094struct exec_domain;
Ingo Molnarc87e2832006-06-27 02:54:58 -070095struct futex_pi_state;
Alexey Dobriyan286100a2008-01-25 21:08:34 +010096struct robust_list_head;
Neil Brownd89d8792007-05-01 09:53:42 +020097struct bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 * List of flags we want to share for kernel threads,
101 * if only because they are not used by them anyway.
102 */
103#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
104
105/*
106 * These are the constant used to fake the fixed-point load-average
107 * counting. Some notes:
108 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
109 * a load-average precision of 10 bits integer + 11 bits fractional
110 * - if you want to count load-averages more often, you need more
111 * precision, or rounding will get you. With 2-second counting freq,
112 * the EXP_n values would be 1981, 2034 and 2043 if still using only
113 * 11 bit fractions.
114 */
115extern unsigned long avenrun[]; /* Load averages */
116
117#define FSHIFT 11 /* nr of bits of precision */
118#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
Linus Torvalds0c2043a2007-10-07 16:17:38 -0700119#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
121#define EXP_5 2014 /* 1/exp(5sec/5min) */
122#define EXP_15 2037 /* 1/exp(5sec/15min) */
123
124#define CALC_LOAD(load,exp,n) \
125 load *= exp; \
126 load += n*(FIXED_1-exp); \
127 load >>= FSHIFT;
128
129extern unsigned long total_forks;
130extern int nr_threads;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131DECLARE_PER_CPU(unsigned long, process_counts);
132extern int nr_processes(void);
133extern unsigned long nr_running(void);
134extern unsigned long nr_uninterruptible(void);
Jack Steinerdb1b1fe2006-03-31 02:31:21 -0800135extern unsigned long nr_active(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136extern unsigned long nr_iowait(void);
137
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200138struct seq_file;
139struct cfs_rq;
Ingo Molnar4cf86d72007-10-15 17:00:14 +0200140struct task_group;
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200141#ifdef CONFIG_SCHED_DEBUG
142extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
143extern void proc_sched_set_task(struct task_struct *p);
144extern void
Ingo Molnar5cef9ec2007-08-09 11:16:47 +0200145print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200146#else
147static inline void
148proc_sched_show_task(struct task_struct *p, struct seq_file *m)
149{
150}
151static inline void proc_sched_set_task(struct task_struct *p)
152{
153}
154static inline void
Ingo Molnar5cef9ec2007-08-09 11:16:47 +0200155print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200156{
157}
158#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Ingo Molnar690229a2008-04-23 09:31:35 +0200160extern unsigned long long time_sync_thresh;
161
Linus Torvalds4a8342d2005-09-29 15:18:21 -0700162/*
163 * Task state bitmask. NOTE! These bits are also
164 * encoded in fs/proc/array.c: get_task_state().
165 *
166 * We have two separate sets of flags: task->state
167 * is about runnability, while task->exit_state are
168 * about the task exiting. Confusing, but this way
169 * modifying one set can't modify the other one by
170 * mistake.
171 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172#define TASK_RUNNING 0
173#define TASK_INTERRUPTIBLE 1
174#define TASK_UNINTERRUPTIBLE 2
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500175#define __TASK_STOPPED 4
176#define __TASK_TRACED 8
Linus Torvalds4a8342d2005-09-29 15:18:21 -0700177/* in tsk->exit_state */
178#define EXIT_ZOMBIE 16
179#define EXIT_DEAD 32
180/* in tsk->state again */
Mike Galbraithaf927232007-10-15 17:00:13 +0200181#define TASK_DEAD 64
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500182#define TASK_WAKEKILL 128
183
184/* Convenience macros for the sake of set_task_state */
185#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
186#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
187#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500189/* Convenience macros for the sake of wake_up */
190#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500191#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500192
193/* get_task_state() */
194#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500195 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
196 __TASK_TRACED)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500197
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500198#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
199#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500200#define task_is_stopped_or_traced(task) \
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500201 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500202#define task_contributes_to_load(task) \
203 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205#define __set_task_state(tsk, state_value) \
206 do { (tsk)->state = (state_value); } while (0)
207#define set_task_state(tsk, state_value) \
208 set_mb((tsk)->state, (state_value))
209
Andrew Morton498d0c52005-09-13 01:25:14 -0700210/*
211 * set_current_state() includes a barrier so that the write of current->state
212 * is correctly serialised wrt the caller's subsequent test of whether to
213 * actually sleep:
214 *
215 * set_current_state(TASK_UNINTERRUPTIBLE);
216 * if (do_i_need_to_sleep())
217 * schedule();
218 *
219 * If the caller does not need such serialisation then use __set_current_state()
220 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221#define __set_current_state(state_value) \
222 do { current->state = (state_value); } while (0)
223#define set_current_state(state_value) \
224 set_mb(current->state, (state_value))
225
226/* Task command name length */
227#define TASK_COMM_LEN 16
228
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229#include <linux/spinlock.h>
230
231/*
232 * This serializes "schedule()" and also protects
233 * the run-queue from deletions/modifications (but
234 * _adding_ to the beginning of the run-queue has
235 * a separate lock).
236 */
237extern rwlock_t tasklist_lock;
238extern spinlock_t mmlist_lock;
239
Ingo Molnar36c8b582006-07-03 00:25:41 -0700240struct task_struct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
242extern void sched_init(void);
243extern void sched_init_smp(void);
Harvey Harrison2d07b252008-02-15 09:56:34 -0800244extern asmlinkage void schedule_tail(struct task_struct *prev);
Ingo Molnar36c8b582006-07-03 00:25:41 -0700245extern void init_idle(struct task_struct *idle, int cpu);
Ingo Molnar1df21052007-07-09 18:51:58 +0200246extern void init_idle_bootup_task(struct task_struct *idle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Ingo Molnar017730c2008-05-12 21:20:52 +0200248extern int runqueue_is_locked(void);
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250extern cpumask_t nohz_cpu_mask;
Siddha, Suresh B46cb4b72007-05-08 00:32:51 -0700251#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
252extern int select_nohz_load_balancer(int cpu);
253#else
254static inline int select_nohz_load_balancer(int cpu)
255{
256 return 0;
257}
258#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Peter Zijlstra48d5e252008-01-25 21:08:31 +0100260extern unsigned long rt_needs_cpu(int cpu);
261
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800262/*
Ingo Molnar39bc89f2007-04-25 20:50:03 -0700263 * Only dump TASK_* tasks. (0 for all tasks)
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800264 */
265extern void show_state_filter(unsigned long state_filter);
266
267static inline void show_state(void)
268{
Ingo Molnar39bc89f2007-04-25 20:50:03 -0700269 show_state_filter(0);
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800270}
271
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272extern void show_regs(struct pt_regs *);
273
274/*
275 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
276 * task), SP is the stack pointer of the first frame that should be shown in the back
277 * trace (or NULL if the entire call-chain of the task should be shown).
278 */
279extern void show_stack(struct task_struct *task, unsigned long *sp);
280
281void io_schedule(void);
282long io_schedule_timeout(long timeout);
283
284extern void cpu_init (void);
285extern void trap_init(void);
Paul Mackerrasfa13a5a2007-11-09 22:39:38 +0100286extern void account_process_tick(struct task_struct *task, int user);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287extern void update_process_times(int user);
288extern void scheduler_tick(void);
Peter Zijlstra8f4d37e2008-01-25 21:08:29 +0100289extern void hrtick_resched(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100291extern void sched_show_task(struct task_struct *p);
292
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700293#ifdef CONFIG_DETECT_SOFTLOCKUP
Ingo Molnar6687a972006-03-24 03:18:41 -0800294extern void softlockup_tick(void);
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700295extern void spawn_softlockup_task(void);
296extern void touch_softlockup_watchdog(void);
Jeremy Fitzhardinge04c91672007-05-08 00:28:05 -0700297extern void touch_all_softlockup_watchdogs(void);
Ingo Molnar9c44bc02008-05-12 21:21:04 +0200298extern unsigned int softlockup_panic;
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100299extern unsigned long sysctl_hung_task_check_count;
300extern unsigned long sysctl_hung_task_timeout_secs;
Ingo Molnar90739082008-01-25 21:08:34 +0100301extern unsigned long sysctl_hung_task_warnings;
Dimitri Sivanich9383d962008-05-12 21:21:14 +0200302extern int softlockup_thresh;
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700303#else
Ingo Molnar6687a972006-03-24 03:18:41 -0800304static inline void softlockup_tick(void)
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700305{
306}
307static inline void spawn_softlockup_task(void)
308{
309}
310static inline void touch_softlockup_watchdog(void)
311{
312}
Jeremy Fitzhardinge04c91672007-05-08 00:28:05 -0700313static inline void touch_all_softlockup_watchdogs(void)
314{
315}
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700316#endif
317
318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319/* Attach to any functions which should be ignored in wchan output. */
320#define __sched __attribute__((__section__(".sched.text")))
Ingo Molnardeaf2222007-11-28 15:52:56 +0100321
322/* Linker adds these: start and end of __sched functions */
323extern char __sched_text_start[], __sched_text_end[];
324
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325/* Is this address in the __sched functions? */
326extern int in_sched_functions(unsigned long addr);
327
328#define MAX_SCHEDULE_TIMEOUT LONG_MAX
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800329extern signed long schedule_timeout(signed long timeout);
Nishanth Aravamudan64ed93a2005-09-10 00:27:21 -0700330extern signed long schedule_timeout_interruptible(signed long timeout);
Matthew Wilcox294d5cc2007-12-06 11:59:46 -0500331extern signed long schedule_timeout_killable(signed long timeout);
Nishanth Aravamudan64ed93a2005-09-10 00:27:21 -0700332extern signed long schedule_timeout_uninterruptible(signed long timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333asmlinkage void schedule(void);
334
Serge E. Hallynab516012006-10-02 02:18:06 -0700335struct nsproxy;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700336struct user_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338/* Maximum number of active map areas.. This is a random (large) number */
339#define DEFAULT_MAX_MAP_COUNT 65536
340
341extern int sysctl_max_map_count;
342
343#include <linux/aio.h>
344
345extern unsigned long
346arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
347 unsigned long, unsigned long);
348extern unsigned long
349arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
350 unsigned long len, unsigned long pgoff,
351 unsigned long flags);
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700352extern void arch_unmap_area(struct mm_struct *, unsigned long);
353extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700355#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
356/*
357 * The mm counters are not protected by its page_table_lock,
358 * so must be incremented atomically.
359 */
Christoph Lameterd3cb4872006-01-06 00:11:20 -0800360#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
361#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
362#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
363#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
364#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700365
366#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
367/*
368 * The mm counters are protected by its page_table_lock,
369 * so can be incremented directly.
370 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
372#define get_mm_counter(mm, member) ((mm)->_##member)
373#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
374#define inc_mm_counter(mm, member) (mm)->_##member++
375#define dec_mm_counter(mm, member) (mm)->_##member--
Hugh Dickins42946212005-10-29 18:16:05 -0700376
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700377#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
378
379#define get_mm_rss(mm) \
380 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
Hugh Dickins365e9c872005-10-29 18:16:18 -0700381#define update_hiwater_rss(mm) do { \
382 unsigned long _rss = get_mm_rss(mm); \
383 if ((mm)->hiwater_rss < _rss) \
384 (mm)->hiwater_rss = _rss; \
385} while (0)
386#define update_hiwater_vm(mm) do { \
387 if ((mm)->hiwater_vm < (mm)->total_vm) \
388 (mm)->hiwater_vm = (mm)->total_vm; \
389} while (0)
390
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700391extern void set_dumpable(struct mm_struct *mm, int value);
392extern int get_dumpable(struct mm_struct *mm);
393
394/* mm flags */
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700395/* dumpable bits */
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700396#define MMF_DUMPABLE 0 /* core dump is permitted */
397#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700398#define MMF_DUMPABLE_BITS 2
399
400/* coredump filter bits */
401#define MMF_DUMP_ANON_PRIVATE 2
402#define MMF_DUMP_ANON_SHARED 3
403#define MMF_DUMP_MAPPED_PRIVATE 4
404#define MMF_DUMP_MAPPED_SHARED 5
Roland McGrath82df3972007-10-16 23:27:02 -0700405#define MMF_DUMP_ELF_HEADERS 6
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700406#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
Roland McGrath82df3972007-10-16 23:27:02 -0700407#define MMF_DUMP_FILTER_BITS 5
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 \
411 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413struct sighand_struct {
414 atomic_t count;
415 struct k_sigaction action[_NSIG];
416 spinlock_t siglock;
Davide Libenzib8fceee2007-09-20 12:40:16 -0700417 wait_queue_head_t signalfd_wqh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418};
419
KaiGai Kohei0e464812006-06-25 05:49:24 -0700420struct pacct_struct {
KaiGai Koheif6ec29a2006-06-25 05:49:25 -0700421 int ac_flag;
422 long ac_exitcode;
KaiGai Kohei0e464812006-06-25 05:49:24 -0700423 unsigned long ac_mem;
KaiGai Kohei77787bf2006-06-25 05:49:26 -0700424 cputime_t ac_utime, ac_stime;
425 unsigned long ac_minflt, ac_majflt;
KaiGai Kohei0e464812006-06-25 05:49:24 -0700426};
427
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428/*
429 * NOTE! "signal_struct" does not have it's own
430 * locking, because a shared signal_struct always
431 * implies a shared sighand_struct, so locking
432 * sighand_struct is always a proper superset of
433 * the locking of signal_struct.
434 */
435struct signal_struct {
436 atomic_t count;
437 atomic_t live;
438
439 wait_queue_head_t wait_chldexit; /* for wait4() */
440
441 /* current thread group signal load-balancing target: */
Ingo Molnar36c8b582006-07-03 00:25:41 -0700442 struct task_struct *curr_target;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444 /* shared signal handling: */
445 struct sigpending shared_pending;
446
447 /* thread group exit support */
448 int group_exit_code;
449 /* overloaded:
450 * - notify group_exit_task when ->count is equal to notify_count
451 * - everyone except group_exit_task is stopped during signal delivery
452 * of fatal signals, group_exit_task processes the signal.
453 */
454 struct task_struct *group_exit_task;
455 int notify_count;
456
457 /* thread group stop support, overloads group_exit_code too */
458 int group_stop_count;
459 unsigned int flags; /* see SIGNAL_* flags below */
460
461 /* POSIX.1b Interval Timers */
462 struct list_head posix_timers;
463
464 /* ITIMER_REAL timer for the process */
Thomas Gleixner2ff678b2006-01-09 20:52:34 -0800465 struct hrtimer real_timer;
Oleg Nesterovfea9d172008-02-08 04:19:19 -0800466 struct pid *leader_pid;
Thomas Gleixner2ff678b2006-01-09 20:52:34 -0800467 ktime_t it_real_incr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
469 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
470 cputime_t it_prof_expires, it_virt_expires;
471 cputime_t it_prof_incr, it_virt_incr;
472
473 /* job control IDs */
Pavel Emelyanov9a2e7052007-10-18 23:40:39 -0700474
475 /*
476 * pgrp and session fields are deprecated.
477 * use the task_session_Xnr and task_pgrp_Xnr routines below
478 */
479
480 union {
481 pid_t pgrp __deprecated;
482 pid_t __pgrp;
483 };
484
Eric W. Biedermanab521dc2007-02-12 00:53:00 -0800485 struct pid *tty_old_pgrp;
Cedric Le Goater1ec320a2006-12-08 02:37:55 -0800486
487 union {
488 pid_t session __deprecated;
489 pid_t __session;
490 };
491
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 /* boolean value for session group leader */
493 int leader;
494
495 struct tty_struct *tty; /* NULL if no tty */
496
497 /*
498 * Cumulative resource counters for dead threads in the group,
499 * and for reaped dead child processes forked by this group.
500 * Live threads maintain their own counters and add to these
501 * in __exit_signal, except for the group leader.
502 */
503 cputime_t utime, stime, cutime, cstime;
Laurent Vivier9ac52312007-10-15 17:00:19 +0200504 cputime_t gtime;
505 cputime_t cgtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
507 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
Eric Dumazet6eaeeab2007-05-10 22:22:37 -0700508 unsigned long inblock, oublock, cinblock, coublock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510 /*
511 * Cumulative ns of scheduled CPU time for dead threads in the
512 * group, not including a zombie group leader. (This only differs
513 * from jiffies_to_ns(utime + stime) if sched_clock uses something
514 * other than jiffies.)
515 */
Ingo Molnar41b86e92007-07-09 18:51:58 +0200516 unsigned long long sum_sched_runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
518 /*
519 * We don't bother to synchronize most readers of this at all,
520 * because there is no reader checking a limit that actually needs
521 * to get both rlim_cur and rlim_max atomically, and either one
522 * alone is a single word that can safely be read normally.
523 * getrlimit/setrlimit use task_lock(current->group_leader) to
524 * protect this instead of the siglock, because they really
525 * have no need to disable irqs.
526 */
527 struct rlimit rlim[RLIM_NLIMITS];
528
529 struct list_head cpu_timers[3];
530
531 /* keep the process-shared keyrings here so that they do the right
532 * thing in threads created with CLONE_THREAD */
533#ifdef CONFIG_KEYS
534 struct key *session_keyring; /* keyring inherited over fork */
535 struct key *process_keyring; /* keyring private to this process */
536#endif
KaiGai Kohei0e464812006-06-25 05:49:24 -0700537#ifdef CONFIG_BSD_PROCESS_ACCT
538 struct pacct_struct pacct; /* per-process accounting information */
539#endif
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700540#ifdef CONFIG_TASKSTATS
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700541 struct taskstats *stats;
542#endif
Miloslav Trmac522ed772007-07-15 23:40:56 -0700543#ifdef CONFIG_AUDIT
544 unsigned audit_tty;
545 struct tty_audit_buf *tty_audit_buf;
546#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547};
548
Nick Piggin4866cde2005-06-25 14:57:23 -0700549/* Context switch must be unlocked if interrupts are to be enabled */
550#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
551# define __ARCH_WANT_UNLOCKED_CTXSW
552#endif
553
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554/*
555 * Bits in flags field of signal_struct.
556 */
557#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
558#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
559#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
560#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
Oleg Nesterove4420552008-04-30 00:52:44 -0700561/*
562 * Pending notifications to parent.
563 */
564#define SIGNAL_CLD_STOPPED 0x00000010
565#define SIGNAL_CLD_CONTINUED 0x00000020
566#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Oleg Nesterovfae5fa42008-04-30 00:53:03 -0700568#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
569
Oleg Nesteroved5d2ca2008-02-04 22:27:24 -0800570/* If true, all threads except ->group_exit_task have pending SIGKILL */
571static inline int signal_group_exit(const struct signal_struct *sig)
572{
573 return (sig->flags & SIGNAL_GROUP_EXIT) ||
574 (sig->group_exit_task != NULL);
575}
576
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577/*
578 * Some day this will be a full-fledged user tracking system..
579 */
580struct user_struct {
581 atomic_t __count; /* reference count */
582 atomic_t processes; /* How many processes does this user have? */
583 atomic_t files; /* How many open files does this user have? */
584 atomic_t sigpending; /* How many pending signals does this user have? */
Amy Griffis2d9048e2006-06-01 13:10:59 -0700585#ifdef CONFIG_INOTIFY_USER
Robert Love0eeca282005-07-12 17:06:03 -0400586 atomic_t inotify_watches; /* How many inotify watches does this user have? */
587 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
588#endif
Alexey Dobriyan970a8642007-10-16 23:30:09 -0700589#ifdef CONFIG_POSIX_MQUEUE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 /* protected by mq_lock */
591 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
Alexey Dobriyan970a8642007-10-16 23:30:09 -0700592#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 unsigned long locked_shm; /* How many pages of mlocked shm ? */
594
595#ifdef CONFIG_KEYS
596 struct key *uid_keyring; /* UID specific keyring */
597 struct key *session_keyring; /* UID's default session keyring */
598#endif
599
600 /* Hash table maintenance information */
Pavel Emelyanov735de222007-09-18 22:46:44 -0700601 struct hlist_node uidhash_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 uid_t uid;
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200603
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100604#ifdef CONFIG_USER_SCHED
Ingo Molnar4cf86d72007-10-15 17:00:14 +0200605 struct task_group *tg;
Dhaval Gianib1a8c172007-10-17 16:55:11 +0200606#ifdef CONFIG_SYSFS
Kay Sieverseb41d942007-11-02 13:47:53 +0100607 struct kobject kobj;
Dhaval Giani5cb350b2007-10-15 17:00:14 +0200608 struct work_struct work;
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200609#endif
Dhaval Gianib1a8c172007-10-17 16:55:11 +0200610#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611};
612
Kay Sieverseb41d942007-11-02 13:47:53 +0100613extern int uids_sysfs_init(void);
Dhaval Giani5cb350b2007-10-15 17:00:14 +0200614
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615extern struct user_struct *find_user(uid_t);
616
617extern struct user_struct root_user;
618#define INIT_USER (&root_user)
619
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620struct backing_dev_info;
621struct reclaim_state;
622
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700623#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624struct sched_info {
625 /* cumulative counters */
Ingo Molnar2d723762007-10-15 17:00:12 +0200626 unsigned long pcount; /* # of times run on this cpu */
Balbir Singh172ba842007-07-09 18:52:00 +0200627 unsigned long long cpu_time, /* time spent on the cpu */
628 run_delay; /* time spent waiting on a runqueue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
630 /* timestamps */
Balbir Singh172ba842007-07-09 18:52:00 +0200631 unsigned long long last_arrival,/* when we last ran on a cpu */
632 last_queued; /* when we were last queued to run */
Ingo Molnarb8efb562007-10-15 17:00:10 +0200633#ifdef CONFIG_SCHEDSTATS
634 /* BKL stats */
Ken Chen480b9432007-10-18 21:32:56 +0200635 unsigned int bkl_count;
Ingo Molnarb8efb562007-10-15 17:00:10 +0200636#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637};
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700638#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700640#ifdef CONFIG_SCHEDSTATS
Helge Deller15ad7cd2006-12-06 20:40:36 -0800641extern const struct file_operations proc_schedstat_operations;
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700642#endif /* CONFIG_SCHEDSTATS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
Shailabh Nagarca74e922006-07-14 00:24:36 -0700644#ifdef CONFIG_TASK_DELAY_ACCT
645struct task_delay_info {
646 spinlock_t lock;
647 unsigned int flags; /* Private per-task flags */
648
649 /* For each stat XXX, add following, aligned appropriately
650 *
651 * struct timespec XXX_start, XXX_end;
652 * u64 XXX_delay;
653 * u32 XXX_count;
654 *
655 * Atomicity of updates to XXX_delay, XXX_count protected by
656 * single lock above (split into XXX_lock if contention is an issue).
657 */
Shailabh Nagar0ff92242006-07-14 00:24:37 -0700658
659 /*
660 * XXX_count is incremented on every XXX operation, the delay
661 * associated with the operation is added to XXX_delay.
662 * XXX_delay contains the accumulated delay time in nanoseconds.
663 */
664 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
665 u64 blkio_delay; /* wait for sync block io completion */
666 u64 swapin_delay; /* wait for swapin block io completion */
667 u32 blkio_count; /* total count of the number of sync block */
668 /* io operations performed */
669 u32 swapin_count; /* total count of the number of swapin block */
670 /* io operations performed */
Shailabh Nagarca74e922006-07-14 00:24:36 -0700671};
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700672#endif /* CONFIG_TASK_DELAY_ACCT */
673
674static inline int sched_info_on(void)
675{
676#ifdef CONFIG_SCHEDSTATS
677 return 1;
678#elif defined(CONFIG_TASK_DELAY_ACCT)
679 extern int delayacct_on;
680 return delayacct_on;
681#else
682 return 0;
Shailabh Nagarca74e922006-07-14 00:24:36 -0700683#endif
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700684}
Shailabh Nagarca74e922006-07-14 00:24:36 -0700685
Ingo Molnard15bcfd2007-07-09 18:51:57 +0200686enum cpu_idle_type {
687 CPU_IDLE,
688 CPU_NOT_IDLE,
689 CPU_NEWLY_IDLE,
690 CPU_MAX_IDLE_TYPES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691};
692
693/*
694 * sched-domains (multiprocessor balancing) declarations:
695 */
Ingo Molnar9aa7b362007-07-09 18:51:58 +0200696
697/*
698 * Increase resolution of nice-level calculations:
699 */
700#define SCHED_LOAD_SHIFT 10
701#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
702
Suresh Siddhaf8700df2007-08-23 15:18:02 +0200703#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
Peter Williams2dd73a42006-06-27 02:54:34 -0700705#ifdef CONFIG_SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
707#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
708#define SD_BALANCE_EXEC 4 /* Balance on exec */
Nick Piggin147cbb42005-06-25 14:57:19 -0700709#define SD_BALANCE_FORK 8 /* Balance on fork, clone */
710#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
711#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
712#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
713#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700714#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700715#define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
Christoph Lameter08c183f2006-12-10 02:20:29 -0800716#define SD_SERIALIZE 1024 /* Only a single load balancing instance */
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900717#define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700718
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700719#define BALANCE_FOR_MC_POWER \
720 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
721
722#define BALANCE_FOR_PKG_POWER \
723 ((sched_mc_power_savings || sched_smt_power_savings) ? \
724 SD_POWERSAVINGS_BALANCE : 0)
725
726#define test_sd_parent(sd, flag) ((sd->parent && \
727 (sd->parent->flags & flag)) ? 1 : 0)
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700728
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729
730struct sched_group {
731 struct sched_group *next; /* Must be a circular list */
732 cpumask_t cpumask;
733
734 /*
735 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
736 * single CPU. This is read only (except for setup, hotplug CPU).
Eric Dumazet5517d862007-05-08 00:32:57 -0700737 * Note : Never change cpu_power without recompute its reciprocal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 */
Eric Dumazet5517d862007-05-08 00:32:57 -0700739 unsigned int __cpu_power;
740 /*
741 * reciprocal value of cpu_power to avoid expensive divides
742 * (see include/linux/reciprocal_div.h)
743 */
744 u32 reciprocal_cpu_power;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745};
746
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900747enum sched_domain_level {
748 SD_LV_NONE = 0,
749 SD_LV_SIBLING,
750 SD_LV_MC,
751 SD_LV_CPU,
752 SD_LV_NODE,
753 SD_LV_ALLNODES,
754 SD_LV_MAX
755};
756
757struct sched_domain_attr {
758 int relax_domain_level;
759};
760
761#define SD_ATTR_INIT (struct sched_domain_attr) { \
762 .relax_domain_level = -1, \
763}
764
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765struct sched_domain {
766 /* These fields must be setup */
767 struct sched_domain *parent; /* top domain must be null terminated */
Siddha, Suresh B1a848872006-10-03 01:14:08 -0700768 struct sched_domain *child; /* bottom domain must be null terminated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 struct sched_group *groups; /* the balancing groups of the domain */
770 cpumask_t span; /* span of all CPUs in this domain */
771 unsigned long min_interval; /* Minimum balance interval ms */
772 unsigned long max_interval; /* Maximum balance interval ms */
773 unsigned int busy_factor; /* less balancing by factor if busy */
774 unsigned int imbalance_pct; /* No balance until over watermark */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
Nick Piggin78979862005-06-25 14:57:13 -0700776 unsigned int busy_idx;
777 unsigned int idle_idx;
778 unsigned int newidle_idx;
779 unsigned int wake_idx;
Nick Piggin147cbb42005-06-25 14:57:19 -0700780 unsigned int forkexec_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 int flags; /* See SD_* */
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900782 enum sched_domain_level level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
784 /* Runtime fields. */
785 unsigned long last_balance; /* init to jiffies. units in jiffies */
786 unsigned int balance_interval; /* initialise to 1. units in ms. */
787 unsigned int nr_balance_failed; /* initialise to 0 */
788
Peter Zijlstra2398f2c2008-06-27 13:41:35 +0200789 u64 last_update;
790
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791#ifdef CONFIG_SCHEDSTATS
792 /* load_balance() stats */
Ken Chen480b9432007-10-18 21:32:56 +0200793 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
794 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
795 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
796 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
797 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
798 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
799 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
800 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
802 /* Active load balancing */
Ken Chen480b9432007-10-18 21:32:56 +0200803 unsigned int alb_count;
804 unsigned int alb_failed;
805 unsigned int alb_pushed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
Nick Piggin68767a02005-06-25 14:57:20 -0700807 /* SD_BALANCE_EXEC stats */
Ken Chen480b9432007-10-18 21:32:56 +0200808 unsigned int sbe_count;
809 unsigned int sbe_balanced;
810 unsigned int sbe_pushed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
Nick Piggin68767a02005-06-25 14:57:20 -0700812 /* SD_BALANCE_FORK stats */
Ken Chen480b9432007-10-18 21:32:56 +0200813 unsigned int sbf_count;
814 unsigned int sbf_balanced;
815 unsigned int sbf_pushed;
Nick Piggin68767a02005-06-25 14:57:20 -0700816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 /* try_to_wake_up() stats */
Ken Chen480b9432007-10-18 21:32:56 +0200818 unsigned int ttwu_wake_remote;
819 unsigned int ttwu_move_affine;
820 unsigned int ttwu_move_balance;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821#endif
822};
823
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900824extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
825 struct sched_domain_attr *dattr_new);
Heiko Carstens9aefd0a2008-03-12 18:31:58 +0100826extern int arch_reinit_sched_domains(void);
Paul Jackson029190c2007-10-18 23:40:20 -0700827
Ingo Molnar1b427c12008-07-18 14:01:39 +0200828#else /* CONFIG_SMP */
829
830struct sched_domain_attr;
831
832static inline void
833partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
834 struct sched_domain_attr *dattr_new)
835{
836}
837#endif /* !CONFIG_SMP */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839struct io_context; /* See blkdev.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840#define NGROUPS_SMALL 32
Eric Dumazet1bf47342008-02-06 01:37:56 -0800841#define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842struct group_info {
843 int ngroups;
844 atomic_t usage;
845 gid_t small_block[NGROUPS_SMALL];
846 int nblocks;
847 gid_t *blocks[0];
848};
849
850/*
851 * get_group_info() must be called with the owning task locked (via task_lock())
852 * when task != current. The reason being that the vast majority of callers are
853 * looking at current->group_info, which can not be changed except by the
854 * current task. Changing current->group_info requires the task lock, too.
855 */
856#define get_group_info(group_info) do { \
857 atomic_inc(&(group_info)->usage); \
858} while (0)
859
860#define put_group_info(group_info) do { \
861 if (atomic_dec_and_test(&(group_info)->usage)) \
862 groups_free(group_info); \
863} while (0)
864
David Howells3e301482005-06-23 22:00:56 -0700865extern struct group_info *groups_alloc(int gidsetsize);
866extern void groups_free(struct group_info *group_info);
867extern int set_current_groups(struct group_info *group_info);
868extern int groups_search(struct group_info *group_info, gid_t grp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869/* access the groups "array" with this macro */
870#define GROUP_AT(gi, i) \
871 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
872
Chen, Kenneth W383f2832005-09-09 13:02:02 -0700873#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
Ingo Molnar36c8b582006-07-03 00:25:41 -0700874extern void prefetch_stack(struct task_struct *t);
Chen, Kenneth W383f2832005-09-09 13:02:02 -0700875#else
876static inline void prefetch_stack(struct task_struct *t) { }
877#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878
879struct audit_context; /* See audit.c */
880struct mempolicy;
Jens Axboeb92ce552006-04-11 13:52:07 +0200881struct pipe_inode_info;
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -0700882struct uts_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
Ingo Molnar20b8a592007-07-09 18:51:58 +0200884struct rq;
885struct sched_domain;
886
887struct sched_class {
Ingo Molnar5522d5d2007-10-15 17:00:12 +0200888 const struct sched_class *next;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200889
Ingo Molnarfd390f62007-08-09 11:16:48 +0200890 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
Ingo Molnarf02231e2007-08-09 11:16:48 +0200891 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
Dmitry Adamushko4530d7a2007-10-15 17:00:08 +0200892 void (*yield_task) (struct rq *rq);
Gregory Haskinse7693a32008-01-25 21:08:09 +0100893 int (*select_task_rq)(struct task_struct *p, int sync);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200894
895 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
896
Ingo Molnarfb8d4722007-08-09 11:16:48 +0200897 struct task_struct * (*pick_next_task) (struct rq *rq);
Ingo Molnar31ee5292007-08-09 11:16:49 +0200898 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200899
Peter Williams681f3e62007-10-24 18:23:51 +0200900#ifdef CONFIG_SMP
Peter Williams43010652007-08-09 11:16:46 +0200901 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
Peter Williamse1d14842007-10-24 18:23:51 +0200902 struct rq *busiest, unsigned long max_load_move,
Ingo Molnar20b8a592007-07-09 18:51:58 +0200903 struct sched_domain *sd, enum cpu_idle_type idle,
Peter Williamsa4ac01c2007-08-09 11:16:46 +0200904 int *all_pinned, int *this_best_prio);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200905
Peter Williamse1d14842007-10-24 18:23:51 +0200906 int (*move_one_task) (struct rq *this_rq, int this_cpu,
907 struct rq *busiest, struct sched_domain *sd,
908 enum cpu_idle_type idle);
Steven Rostedt9a897c52008-01-25 21:08:22 +0100909 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
910 void (*post_schedule) (struct rq *this_rq);
911 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
Peter Williams681f3e62007-10-24 18:23:51 +0200912#endif
Peter Williamse1d14842007-10-24 18:23:51 +0200913
Srivatsa Vaddagiri83b699e2007-10-15 17:00:08 +0200914 void (*set_curr_task) (struct rq *rq);
Peter Zijlstra8f4d37e2008-01-25 21:08:29 +0100915 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
Ingo Molnaree0827d2007-08-09 11:16:49 +0200916 void (*task_new) (struct rq *rq, struct task_struct *p);
Mike Traviscd8ba7c2008-03-26 14:23:49 -0700917 void (*set_cpus_allowed)(struct task_struct *p,
918 const cpumask_t *newmask);
Gregory Haskins57d885f2008-01-25 21:08:18 +0100919
Gregory Haskins1f11eb62008-06-04 15:04:05 -0400920 void (*rq_online)(struct rq *rq);
921 void (*rq_offline)(struct rq *rq);
Steven Rostedtcb469842008-01-25 21:08:22 +0100922
923 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
924 int running);
925 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
926 int running);
927 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
928 int oldprio, int running);
Peter Zijlstra810b3812008-02-29 15:21:01 -0500929
930#ifdef CONFIG_FAIR_GROUP_SCHED
931 void (*moved_group) (struct task_struct *p);
932#endif
Ingo Molnar20b8a592007-07-09 18:51:58 +0200933};
934
935struct load_weight {
936 unsigned long weight, inv_weight;
937};
938
939/*
940 * CFS stats for a schedulable entity (task, task-group etc)
941 *
942 * Current field usage histogram:
943 *
944 * 4 se->block_start
945 * 4 se->run_node
946 * 4 se->sleep_start
Ingo Molnar20b8a592007-07-09 18:51:58 +0200947 * 6 se->load.weight
Ingo Molnar20b8a592007-07-09 18:51:58 +0200948 */
949struct sched_entity {
Ingo Molnar20b8a592007-07-09 18:51:58 +0200950 struct load_weight load; /* for load-balancing */
951 struct rb_node run_node;
Peter Zijlstra4a55bd52008-04-19 19:45:00 +0200952 struct list_head group_node;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200953 unsigned int on_rq;
954
Ingo Molnar20b8a592007-07-09 18:51:58 +0200955 u64 exec_start;
Ingo Molnar94c18222007-08-02 17:41:40 +0200956 u64 sum_exec_runtime;
Ingo Molnare9acbff2007-10-15 17:00:04 +0200957 u64 vruntime;
Ingo Molnarf6cf8912007-08-28 12:53:24 +0200958 u64 prev_sum_exec_runtime;
Ingo Molnar94c18222007-08-02 17:41:40 +0200959
Ingo Molnar4ae7d5c2008-03-19 01:42:00 +0100960 u64 last_wakeup;
961 u64 avg_overlap;
962
Ingo Molnar94c18222007-08-02 17:41:40 +0200963#ifdef CONFIG_SCHEDSTATS
964 u64 wait_start;
965 u64 wait_max;
Arjan van de Ven6d082592008-01-25 21:08:35 +0100966 u64 wait_count;
967 u64 wait_sum;
Ingo Molnar94c18222007-08-02 17:41:40 +0200968
969 u64 sleep_start;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200970 u64 sleep_max;
Ingo Molnar94c18222007-08-02 17:41:40 +0200971 s64 sum_sleep_runtime;
972
973 u64 block_start;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200974 u64 block_max;
975 u64 exec_max;
Ingo Molnareba1ed42007-10-15 17:00:02 +0200976 u64 slice_max;
Ingo Molnarcc367732007-10-15 17:00:18 +0200977
978 u64 nr_migrations;
979 u64 nr_migrations_cold;
980 u64 nr_failed_migrations_affine;
981 u64 nr_failed_migrations_running;
982 u64 nr_failed_migrations_hot;
983 u64 nr_forced_migrations;
984 u64 nr_forced2_migrations;
985
986 u64 nr_wakeups;
987 u64 nr_wakeups_sync;
988 u64 nr_wakeups_migrate;
989 u64 nr_wakeups_local;
990 u64 nr_wakeups_remote;
991 u64 nr_wakeups_affine;
992 u64 nr_wakeups_affine_attempts;
993 u64 nr_wakeups_passive;
994 u64 nr_wakeups_idle;
Ingo Molnar94c18222007-08-02 17:41:40 +0200995#endif
996
Ingo Molnar20b8a592007-07-09 18:51:58 +0200997#ifdef CONFIG_FAIR_GROUP_SCHED
998 struct sched_entity *parent;
999 /* rq on which this entity is (to be) queued: */
1000 struct cfs_rq *cfs_rq;
1001 /* rq "owned" by this entity/group: */
1002 struct cfs_rq *my_q;
1003#endif
1004};
Ingo Molnar70b97a72006-07-03 00:25:42 -07001005
Peter Zijlstrafa717062008-01-25 21:08:27 +01001006struct sched_rt_entity {
1007 struct list_head run_list;
1008 unsigned int time_slice;
Peter Zijlstra78f2c7d2008-01-25 21:08:27 +01001009 unsigned long timeout;
Peter Zijlstra6f505b12008-01-25 21:08:30 +01001010 int nr_cpus_allowed;
1011
Peter Zijlstra58d6c2d2008-04-19 19:45:00 +02001012 struct sched_rt_entity *back;
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01001013#ifdef CONFIG_RT_GROUP_SCHED
Peter Zijlstra6f505b12008-01-25 21:08:30 +01001014 struct sched_rt_entity *parent;
1015 /* rq on which this entity is (to be) queued: */
1016 struct rt_rq *rt_rq;
1017 /* rq "owned" by this entity/group: */
1018 struct rt_rq *my_q;
1019#endif
Peter Zijlstrafa717062008-01-25 21:08:27 +01001020};
1021
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022struct task_struct {
1023 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
Roman Zippelf7e42172007-05-09 02:35:17 -07001024 void *stack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 atomic_t usage;
William Cohen97dc32c2007-05-08 00:23:41 -07001026 unsigned int flags; /* per process flags, defined below */
1027 unsigned int ptrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -07001029 int lock_depth; /* BKL lock depth */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
Peter Williams2dd73a42006-06-27 02:54:34 -07001031#ifdef CONFIG_SMP
1032#ifdef __ARCH_WANT_UNLOCKED_CTXSW
Nick Piggin4866cde2005-06-25 14:57:23 -07001033 int oncpu;
1034#endif
Peter Williams2dd73a42006-06-27 02:54:34 -07001035#endif
Ingo Molnar50e645a2007-07-09 18:52:00 +02001036
Ingo Molnarb29739f2006-06-27 02:54:51 -07001037 int prio, static_prio, normal_prio;
Richard Kennedyc7aceab2008-05-15 12:09:15 +01001038 unsigned int rt_priority;
Ingo Molnar5522d5d2007-10-15 17:00:12 +02001039 const struct sched_class *sched_class;
Ingo Molnar20b8a592007-07-09 18:51:58 +02001040 struct sched_entity se;
Peter Zijlstrafa717062008-01-25 21:08:27 +01001041 struct sched_rt_entity rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042
Avi Kivitye107be32007-07-26 13:40:43 +02001043#ifdef CONFIG_PREEMPT_NOTIFIERS
1044 /* list of struct preempt_notifier: */
1045 struct hlist_head preempt_notifiers;
1046#endif
1047
Alexey Dobriyan18796aa2007-10-16 23:30:26 -07001048 /*
1049 * fpu_counter contains the number of consecutive context switches
1050 * that the FPU is used. If this is over a threshold, the lazy fpu
1051 * saving becomes unlazy to save the trap. This is an unsigned char
1052 * so that after 256 times the counter wraps and the behavior turns
1053 * lazy again; this to deal with bursty apps that only use FPU for
1054 * a short time
1055 */
1056 unsigned char fpu_counter;
1057 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -07001058#ifdef CONFIG_BLK_DEV_IO_TRACE
Jens Axboe2056a782006-03-23 20:00:26 +01001059 unsigned int btrace_seq;
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -07001060#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
William Cohen97dc32c2007-05-08 00:23:41 -07001062 unsigned int policy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 cpumask_t cpus_allowed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064
Paul E. McKenneye260be62008-01-25 21:08:24 +01001065#ifdef CONFIG_PREEMPT_RCU
1066 int rcu_read_lock_nesting;
1067 int rcu_flipctr_idx;
1068#endif /* #ifdef CONFIG_PREEMPT_RCU */
1069
Chandra Seetharaman52f17b62006-07-14 00:24:38 -07001070#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 struct sched_info sched_info;
1072#endif
1073
1074 struct list_head tasks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075
1076 struct mm_struct *mm, *active_mm;
1077
1078/* task state */
1079 struct linux_binfmt *binfmt;
William Cohen97dc32c2007-05-08 00:23:41 -07001080 int exit_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 int exit_code, exit_signal;
1082 int pdeath_signal; /* The signal sent when the parent dies */
1083 /* ??? */
William Cohen97dc32c2007-05-08 00:23:41 -07001084 unsigned int personality;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 unsigned did_exec:1;
1086 pid_t pid;
1087 pid_t tgid;
Arjan van de Ven0a4254052006-09-26 10:52:38 +02001088
1089#ifdef CONFIG_CC_STACKPROTECTOR
1090 /* Canary value for the -fstack-protector gcc feature */
1091 unsigned long stack_canary;
1092#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 /*
1094 * pointers to (original) parent process, youngest child, younger sibling,
1095 * older sibling, respectively. (p->father can be replaced with
Roland McGrathf4700212008-03-24 18:36:23 -07001096 * p->real_parent->pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 */
Roland McGrathf4700212008-03-24 18:36:23 -07001098 struct task_struct *real_parent; /* real parent process */
1099 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 /*
Roland McGrathf4700212008-03-24 18:36:23 -07001101 * children/sibling forms the list of my natural children
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 */
1103 struct list_head children; /* list of my children */
1104 struct list_head sibling; /* linkage in my parent's children list */
1105 struct task_struct *group_leader; /* threadgroup leader */
1106
Roland McGrathf4700212008-03-24 18:36:23 -07001107 /*
1108 * ptraced is the list of tasks this task is using ptrace on.
1109 * This includes both natural children and PTRACE_ATTACH targets.
1110 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1111 */
1112 struct list_head ptraced;
1113 struct list_head ptrace_entry;
1114
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 /* PID/PID hash table linkage. */
Eric W. Biederman92476d72006-03-31 02:31:42 -08001116 struct pid_link pids[PIDTYPE_MAX];
Oleg Nesterov47e65322006-03-28 16:11:25 -08001117 struct list_head thread_group;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118
1119 struct completion *vfork_done; /* for vfork() */
1120 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1121 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1122
Michael Neulingc66f08b2007-10-18 03:06:34 -07001123 cputime_t utime, stime, utimescaled, stimescaled;
Laurent Vivier9ac52312007-10-15 17:00:19 +02001124 cputime_t gtime;
Balbir Singh93018992007-10-30 00:26:32 +01001125 cputime_t prev_utime, prev_stime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 unsigned long nvcsw, nivcsw; /* context switch counts */
Tomas Janousek924b42d2007-07-15 23:39:42 -07001127 struct timespec start_time; /* monotonic time */
1128 struct timespec real_start_time; /* boot based time */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1130 unsigned long min_flt, maj_flt;
1131
1132 cputime_t it_prof_expires, it_virt_expires;
1133 unsigned long long it_sched_expires;
1134 struct list_head cpu_timers[3];
1135
1136/* process credentials */
1137 uid_t uid,euid,suid,fsuid;
1138 gid_t gid,egid,sgid,fsgid;
1139 struct group_info *group_info;
Serge E. Hallyn3b7391d2008-02-04 22:29:45 -08001140 kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 struct user_struct *user;
Richard Kennedyc7aceab2008-05-15 12:09:15 +01001142 unsigned securebits;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143#ifdef CONFIG_KEYS
Richard Kennedyc7aceab2008-05-15 12:09:15 +01001144 unsigned char jit_keyring; /* default keyring to attach requested keys to */
David Howellsb5f545c2006-01-08 01:02:47 -08001145 struct key *request_key_auth; /* assumed request_key authority */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 struct key *thread_keyring; /* keyring private to this thread */
1147#endif
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -07001148 char comm[TASK_COMM_LEN]; /* executable name excluding path
1149 - access with [gs]et_task_comm (which lock
1150 it with task_lock())
1151 - initialized normally by flush_old_exec */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152/* file system info */
1153 int link_count, total_link_count;
Alexey Dobriyan3d5b6fc2006-09-29 01:59:40 -07001154#ifdef CONFIG_SYSVIPC
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155/* ipc stuff */
1156 struct sysv_sem sysvsem;
Alexey Dobriyan3d5b6fc2006-09-29 01:59:40 -07001157#endif
Ingo Molnar82a1fcb2008-01-25 21:08:02 +01001158#ifdef CONFIG_DETECT_SOFTLOCKUP
1159/* hung task detection */
1160 unsigned long last_switch_timestamp;
1161 unsigned long last_switch_count;
1162#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163/* CPU-specific state of this task */
1164 struct thread_struct thread;
1165/* filesystem information */
1166 struct fs_struct *fs;
1167/* open file information */
1168 struct files_struct *files;
Serge E. Hallyn1651e142006-10-02 02:18:08 -07001169/* namespaces */
Serge E. Hallynab516012006-10-02 02:18:06 -07001170 struct nsproxy *nsproxy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171/* signal handlers */
1172 struct signal_struct *signal;
1173 struct sighand_struct *sighand;
1174
1175 sigset_t blocked, real_blocked;
Roland McGrathf3de2722008-04-30 00:53:09 -07001176 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 struct sigpending pending;
1178
1179 unsigned long sas_ss_sp;
1180 size_t sas_ss_size;
1181 int (*notifier)(void *priv);
1182 void *notifier_data;
1183 sigset_t *notifier_mask;
Alexey Dobriyan57c521c2007-10-16 23:31:35 -07001184#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 void *security;
Alexey Dobriyan57c521c2007-10-16 23:31:35 -07001186#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 struct audit_context *audit_context;
Al Virobfef93a2008-01-10 04:53:18 -05001188#ifdef CONFIG_AUDITSYSCALL
1189 uid_t loginuid;
Eric Paris4746ec52008-01-08 10:06:53 -05001190 unsigned int sessionid;
Al Virobfef93a2008-01-10 04:53:18 -05001191#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 seccomp_t seccomp;
1193
1194/* Thread group tracking */
1195 u32 parent_exec_id;
1196 u32 self_exec_id;
1197/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1198 spinlock_t alloc_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199
Ingo Molnarb29739f2006-06-27 02:54:51 -07001200 /* Protection of the PI data structures: */
1201 spinlock_t pi_lock;
1202
Ingo Molnar23f78d4a2006-06-27 02:54:53 -07001203#ifdef CONFIG_RT_MUTEXES
1204 /* PI waiters blocked on a rt_mutex held by this task */
1205 struct plist_head pi_waiters;
1206 /* Deadlock detection and priority inheritance handling */
1207 struct rt_mutex_waiter *pi_blocked_on;
Ingo Molnar23f78d4a2006-06-27 02:54:53 -07001208#endif
1209
Ingo Molnar408894e2006-01-09 15:59:20 -08001210#ifdef CONFIG_DEBUG_MUTEXES
1211 /* mutex deadlock detection */
1212 struct mutex_waiter *blocked_on;
1213#endif
Ingo Molnarde30a2b2006-07-03 00:24:42 -07001214#ifdef CONFIG_TRACE_IRQFLAGS
1215 unsigned int irq_events;
1216 int hardirqs_enabled;
1217 unsigned long hardirq_enable_ip;
1218 unsigned int hardirq_enable_event;
1219 unsigned long hardirq_disable_ip;
1220 unsigned int hardirq_disable_event;
1221 int softirqs_enabled;
1222 unsigned long softirq_disable_ip;
1223 unsigned int softirq_disable_event;
1224 unsigned long softirq_enable_ip;
1225 unsigned int softirq_enable_event;
1226 int hardirq_context;
1227 int softirq_context;
1228#endif
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001229#ifdef CONFIG_LOCKDEP
Peter Zijlstrabdb94412008-02-25 23:02:48 +01001230# define MAX_LOCK_DEPTH 48UL
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001231 u64 curr_chain_key;
1232 int lockdep_depth;
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001233 unsigned int lockdep_recursion;
Richard Kennedyc7aceab2008-05-15 12:09:15 +01001234 struct held_lock held_locks[MAX_LOCK_DEPTH];
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001235#endif
Ingo Molnar408894e2006-01-09 15:59:20 -08001236
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237/* journalling filesystem info */
1238 void *journal_info;
1239
Neil Brownd89d8792007-05-01 09:53:42 +02001240/* stacked block device info */
1241 struct bio *bio_list, **bio_tail;
1242
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243/* VM state */
1244 struct reclaim_state *reclaim_state;
1245
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 struct backing_dev_info *backing_dev_info;
1247
1248 struct io_context *io_context;
1249
1250 unsigned long ptrace_message;
1251 siginfo_t *last_siginfo; /* For ptrace use. */
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001252#ifdef CONFIG_TASK_XACCT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253/* i/o counters(bytes read/written, #syscalls */
1254 u64 rchar, wchar, syscr, syscw;
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001255#endif
Andrew Morton7c3ab732006-12-10 02:19:19 -08001256 struct task_io_accounting ioac;
Jay Lan8f0ab512006-09-30 23:28:59 -07001257#if defined(CONFIG_TASK_XACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 u64 acct_rss_mem1; /* accumulated rss usage */
1259 u64 acct_vm_mem1; /* accumulated virtual memory usage */
Jay Landb5fed262006-09-30 23:29:00 -07001260 cputime_t acct_stimexpd;/* stime since last update */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262#ifdef CONFIG_CPUSETS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 nodemask_t mems_allowed;
1264 int cpuset_mems_generation;
Paul Jackson825a46a2006-03-24 03:16:03 -08001265 int cpuset_mem_spread_rotor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266#endif
Paul Menageddbcc7e2007-10-18 23:39:30 -07001267#ifdef CONFIG_CGROUPS
Paul Menage817929e2007-10-18 23:39:36 -07001268 /* Control Group info protected by css_set_lock */
1269 struct css_set *cgroups;
1270 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1271 struct list_head cg_list;
Paul Menageddbcc7e2007-10-18 23:39:30 -07001272#endif
Alexey Dobriyan42b2dd02007-10-16 23:27:30 -07001273#ifdef CONFIG_FUTEX
Ingo Molnar0771dfe2006-03-27 01:16:22 -08001274 struct robust_list_head __user *robust_list;
Ingo Molnar34f192c2006-03-27 01:16:24 -08001275#ifdef CONFIG_COMPAT
1276 struct compat_robust_list_head __user *compat_robust_list;
1277#endif
Ingo Molnarc87e2832006-06-27 02:54:58 -07001278 struct list_head pi_state_list;
1279 struct futex_pi_state *pi_state_cache;
Alexey Dobriyan42b2dd02007-10-16 23:27:30 -07001280#endif
Richard Kennedyc7aceab2008-05-15 12:09:15 +01001281#ifdef CONFIG_NUMA
1282 struct mempolicy *mempolicy;
1283 short il_next;
1284#endif
Jens Axboe22e2c502005-06-27 10:55:12 +02001285 atomic_t fs_excl; /* holding fs exclusive resources */
Ingo Molnare56d0902006-01-08 01:01:37 -08001286 struct rcu_head rcu;
Jens Axboeb92ce552006-04-11 13:52:07 +02001287
1288 /*
1289 * cache last used pipe for splice
1290 */
1291 struct pipe_inode_info *splice_pipe;
Shailabh Nagarca74e922006-07-14 00:24:36 -07001292#ifdef CONFIG_TASK_DELAY_ACCT
1293 struct task_delay_info *delays;
1294#endif
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001295#ifdef CONFIG_FAULT_INJECTION
1296 int make_it_fail;
1297#endif
Peter Zijlstra3e26c142007-10-16 23:25:50 -07001298 struct prop_local_single dirties;
Arjan van de Ven97455122008-01-25 21:08:34 +01001299#ifdef CONFIG_LATENCYTOP
1300 int latency_record_count;
1301 struct latency_record latency_record[LT_SAVECOUNT];
1302#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303};
1304
Ingo Molnare05606d2007-07-09 18:51:59 +02001305/*
1306 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1307 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1308 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1309 * values are inverted: lower p->prio value means higher priority.
1310 *
1311 * The MAX_USER_RT_PRIO value allows the actual maximum
1312 * RT priority to be separate from the value exported to
1313 * user-space. This allows kernel threads to set their
1314 * priority to a value higher than any user task. Note:
1315 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1316 */
1317
1318#define MAX_USER_RT_PRIO 100
1319#define MAX_RT_PRIO MAX_USER_RT_PRIO
1320
1321#define MAX_PRIO (MAX_RT_PRIO + 40)
1322#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1323
1324static inline int rt_prio(int prio)
1325{
1326 if (unlikely(prio < MAX_RT_PRIO))
1327 return 1;
1328 return 0;
1329}
1330
Alexey Dobriyane8681712007-10-26 12:17:22 +04001331static inline int rt_task(struct task_struct *p)
Ingo Molnare05606d2007-07-09 18:51:59 +02001332{
1333 return rt_prio(p->prio);
1334}
1335
Pavel Emelianova47afb02007-10-18 23:39:46 -07001336static inline void set_task_session(struct task_struct *tsk, pid_t session)
Cedric Le Goater937949d2006-12-08 02:37:54 -08001337{
Pavel Emelianova47afb02007-10-18 23:39:46 -07001338 tsk->signal->__session = session;
Cedric Le Goater937949d2006-12-08 02:37:54 -08001339}
1340
Pavel Emelyanov9a2e7052007-10-18 23:40:39 -07001341static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1342{
1343 tsk->signal->__pgrp = pgrp;
1344}
1345
Alexey Dobriyane8681712007-10-26 12:17:22 +04001346static inline struct pid *task_pid(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001347{
1348 return task->pids[PIDTYPE_PID].pid;
1349}
1350
Alexey Dobriyane8681712007-10-26 12:17:22 +04001351static inline struct pid *task_tgid(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001352{
1353 return task->group_leader->pids[PIDTYPE_PID].pid;
1354}
1355
Alexey Dobriyane8681712007-10-26 12:17:22 +04001356static inline struct pid *task_pgrp(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001357{
1358 return task->group_leader->pids[PIDTYPE_PGID].pid;
1359}
1360
Alexey Dobriyane8681712007-10-26 12:17:22 +04001361static inline struct pid *task_session(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001362{
1363 return task->group_leader->pids[PIDTYPE_SID].pid;
1364}
1365
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001366struct pid_namespace;
1367
1368/*
1369 * the helpers to get the task's different pids as they are seen
1370 * from various namespaces
1371 *
1372 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
Eric W. Biederman44c4e1b2008-02-08 04:19:15 -08001373 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1374 * current.
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001375 * task_xid_nr_ns() : id seen from the ns specified;
1376 *
1377 * set_task_vxid() : assigns a virtual id to a task;
1378 *
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001379 * see also pid_nr() etc in include/linux/pid.h
1380 */
1381
Alexey Dobriyane8681712007-10-26 12:17:22 +04001382static inline pid_t task_pid_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001383{
1384 return tsk->pid;
1385}
1386
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001387pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001388
1389static inline pid_t task_pid_vnr(struct task_struct *tsk)
1390{
1391 return pid_vnr(task_pid(tsk));
1392}
1393
1394
Alexey Dobriyane8681712007-10-26 12:17:22 +04001395static inline pid_t task_tgid_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001396{
1397 return tsk->tgid;
1398}
1399
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001400pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001401
1402static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1403{
1404 return pid_vnr(task_tgid(tsk));
1405}
1406
1407
Alexey Dobriyane8681712007-10-26 12:17:22 +04001408static inline pid_t task_pgrp_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001409{
Pavel Emelyanov9a2e7052007-10-18 23:40:39 -07001410 return tsk->signal->__pgrp;
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001411}
1412
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001413pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001414
1415static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1416{
1417 return pid_vnr(task_pgrp(tsk));
1418}
1419
1420
Alexey Dobriyane8681712007-10-26 12:17:22 +04001421static inline pid_t task_session_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001422{
1423 return tsk->signal->__session;
1424}
1425
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001426pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001427
1428static inline pid_t task_session_vnr(struct task_struct *tsk)
1429{
1430 return pid_vnr(task_session(tsk));
1431}
1432
1433
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434/**
1435 * pid_alive - check that a task structure is not stale
1436 * @p: Task structure to be checked.
1437 *
1438 * Test if a process is not yet dead (at most zombie state)
1439 * If pid_alive fails, then pointers within the task structure
1440 * can be stale and must not be dereferenced.
1441 */
Alexey Dobriyane8681712007-10-26 12:17:22 +04001442static inline int pid_alive(struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443{
Eric W. Biederman92476d72006-03-31 02:31:42 -08001444 return p->pids[PIDTYPE_PID].pid != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445}
1446
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001447/**
Serge E. Hallynb460cbc2007-10-18 23:39:52 -07001448 * is_global_init - check if a task structure is init
Henne32602592006-10-06 00:44:01 -07001449 * @tsk: Task structure to be checked.
1450 *
1451 * Check if a task structure is the first user space task the kernel created.
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001452 */
Alexey Dobriyane8681712007-10-26 12:17:22 +04001453static inline int is_global_init(struct task_struct *tsk)
Pavel Emelyanovb461cc02007-10-18 23:40:09 -07001454{
1455 return tsk->pid == 1;
1456}
Serge E. Hallynb460cbc2007-10-18 23:39:52 -07001457
1458/*
1459 * is_container_init:
1460 * check whether in the task is init in its own pid namespace.
1461 */
Pavel Emelyanovb461cc02007-10-18 23:40:09 -07001462extern int is_container_init(struct task_struct *tsk);
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001463
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001464extern struct pid *cad_pid;
1465
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466extern void free_task(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
Ingo Molnare56d0902006-01-08 01:01:37 -08001468
Andrew Morton158d9eb2006-03-31 02:31:34 -08001469extern void __put_task_struct(struct task_struct *t);
Ingo Molnare56d0902006-01-08 01:01:37 -08001470
1471static inline void put_task_struct(struct task_struct *t)
1472{
1473 if (atomic_dec_and_test(&t->usage))
Eric W. Biederman8c7904a2006-03-31 02:31:37 -08001474 __put_task_struct(t);
Ingo Molnare56d0902006-01-08 01:01:37 -08001475}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476
1477/*
1478 * Per process flags
1479 */
1480#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1481 /* Not implemented yet, only for 486*/
1482#define PF_STARTING 0x00000002 /* being created */
1483#define PF_EXITING 0x00000004 /* getting shut down */
Alexey Kuznetsov778e9a92007-06-08 13:47:00 -07001484#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
Laurent Vivier94886b82007-10-15 17:00:19 +02001485#define PF_VCPU 0x00000010 /* I'm a virtual CPU */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1487#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1488#define PF_DUMPCORE 0x00000200 /* dumped core */
1489#define PF_SIGNALED 0x00000400 /* killed by a signal */
1490#define PF_MEMALLOC 0x00000800 /* Allocating memory */
1491#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1492#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1494#define PF_FROZEN 0x00010000 /* frozen for system suspend */
1495#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1496#define PF_KSWAPD 0x00040000 /* I am kswapd */
1497#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1498#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
Oleg Nesterov246bb0b2008-07-25 01:47:38 -07001499#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
Jens Axboeb31dc662006-06-13 08:26:10 +02001500#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1501#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1502#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1503#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
David Rientjes9985b0b2008-06-05 12:57:11 -07001504#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
Paul Jacksonc61afb12006-03-24 03:16:08 -08001505#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
Thomas Gleixner61a87122006-06-27 02:54:56 -07001506#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
Rafael J. Wysockiba96a0c2007-05-23 13:57:25 -07001507#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
Rafael J. Wysockiebb12db2008-06-11 22:04:29 +02001508#define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509
1510/*
1511 * Only the _current_ task can read/write to tsk->flags, but other
1512 * tasks can access tsk->flags in readonly mode for example
1513 * with tsk_used_math (like during threaded core dumping).
1514 * There is however an exception to this rule during ptrace
1515 * or during fork: the ptracer task is allowed to write to the
1516 * child->flags of its traced child (same goes for fork, the parent
1517 * can write to the child->flags), because we're guaranteed the
1518 * child is not running and in turn not changing child->flags
1519 * at the same time the parent does it.
1520 */
1521#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1522#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1523#define clear_used_math() clear_stopped_child_used_math(current)
1524#define set_used_math() set_stopped_child_used_math(current)
1525#define conditional_stopped_child_used_math(condition, child) \
1526 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1527#define conditional_used_math(condition) \
1528 conditional_stopped_child_used_math(condition, current)
1529#define copy_to_stopped_child_used_math(child) \
1530 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1531/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1532#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1533#define used_math() tsk_used_math(current)
1534
1535#ifdef CONFIG_SMP
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001536extern int set_cpus_allowed_ptr(struct task_struct *p,
1537 const cpumask_t *new_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538#else
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001539static inline int set_cpus_allowed_ptr(struct task_struct *p,
1540 const cpumask_t *new_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541{
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001542 if (!cpu_isset(0, *new_mask))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 return -EINVAL;
1544 return 0;
1545}
1546#endif
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001547static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1548{
1549 return set_cpus_allowed_ptr(p, &new_mask);
1550}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551
1552extern unsigned long long sched_clock(void);
Ingo Molnare436d802007-07-19 21:28:35 +02001553
Peter Zijlstra3e51f332008-05-03 18:29:28 +02001554#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1555static inline void sched_clock_init(void)
1556{
1557}
1558
1559static inline u64 sched_clock_cpu(int cpu)
1560{
1561 return sched_clock();
1562}
1563
1564static inline void sched_clock_tick(void)
1565{
1566}
1567
1568static inline void sched_clock_idle_sleep_event(void)
1569{
1570}
1571
1572static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1573{
1574}
Steven Rostedtaf52a902008-07-07 14:16:52 -04001575
1576#ifdef CONFIG_NO_HZ
1577static inline void sched_clock_tick_stop(int cpu)
1578{
1579}
1580
1581static inline void sched_clock_tick_start(int cpu)
1582{
1583}
1584#endif
1585
1586#else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
Peter Zijlstra3e51f332008-05-03 18:29:28 +02001587extern void sched_clock_init(void);
1588extern u64 sched_clock_cpu(int cpu);
1589extern void sched_clock_tick(void);
1590extern void sched_clock_idle_sleep_event(void);
1591extern void sched_clock_idle_wakeup_event(u64 delta_ns);
Steven Rostedtaf52a902008-07-07 14:16:52 -04001592#ifdef CONFIG_NO_HZ
1593extern void sched_clock_tick_stop(int cpu);
1594extern void sched_clock_tick_start(int cpu);
Peter Zijlstra3e51f332008-05-03 18:29:28 +02001595#endif
Steven Rostedtaf52a902008-07-07 14:16:52 -04001596#endif /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
Peter Zijlstra3e51f332008-05-03 18:29:28 +02001597
Ingo Molnare436d802007-07-19 21:28:35 +02001598/*
1599 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1600 * clock constructed from sched_clock():
1601 */
1602extern unsigned long long cpu_clock(int cpu);
1603
Ingo Molnar36c8b582006-07-03 00:25:41 -07001604extern unsigned long long
Ingo Molnar41b86e92007-07-09 18:51:58 +02001605task_sched_runtime(struct task_struct *task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606
1607/* sched_exec is called by processes performing an exec */
1608#ifdef CONFIG_SMP
1609extern void sched_exec(void);
1610#else
1611#define sched_exec() {}
1612#endif
1613
Ingo Molnar2aa44d02007-08-23 15:18:02 +02001614extern void sched_clock_idle_sleep_event(void);
1615extern void sched_clock_idle_wakeup_event(u64 delta_ns);
Ingo Molnarbb29ab22007-07-09 18:51:59 +02001616
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617#ifdef CONFIG_HOTPLUG_CPU
1618extern void idle_task_exit(void);
1619#else
1620static inline void idle_task_exit(void) {}
1621#endif
1622
1623extern void sched_idle_next(void);
Ingo Molnarb29739f2006-06-27 02:54:51 -07001624
Thomas Gleixner06d83082008-03-22 09:20:24 +01001625#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1626extern void wake_up_idle_cpu(int cpu);
1627#else
1628static inline void wake_up_idle_cpu(int cpu) { }
1629#endif
1630
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001631#ifdef CONFIG_SCHED_DEBUG
Peter Zijlstra21805082007-08-25 18:41:53 +02001632extern unsigned int sysctl_sched_latency;
Peter Zijlstrab2be5e92007-11-09 22:39:37 +01001633extern unsigned int sysctl_sched_min_granularity;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001634extern unsigned int sysctl_sched_wakeup_granularity;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001635extern unsigned int sysctl_sched_child_runs_first;
1636extern unsigned int sysctl_sched_features;
Ingo Molnarda84d962007-10-15 17:00:18 +02001637extern unsigned int sysctl_sched_migration_cost;
Peter Zijlstrab82d9fd2007-11-09 22:39:39 +01001638extern unsigned int sysctl_sched_nr_migrate;
Peter Zijlstra2398f2c2008-06-27 13:41:35 +02001639extern unsigned int sysctl_sched_shares_ratelimit;
Peter Zijlstrab2be5e92007-11-09 22:39:37 +01001640
1641int sched_nr_latency_handler(struct ctl_table *table, int write,
1642 struct file *file, void __user *buffer, size_t *length,
1643 loff_t *ppos);
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001644#endif
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +01001645extern unsigned int sysctl_sched_rt_period;
1646extern int sysctl_sched_rt_runtime;
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001647
Peter Zijlstrad0b27fa2008-04-19 19:44:57 +02001648int sched_rt_handler(struct ctl_table *table, int write,
1649 struct file *filp, void __user *buffer, size_t *lenp,
1650 loff_t *ppos);
1651
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001652extern unsigned int sysctl_sched_compat_yield;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001653
Ingo Molnarb29739f2006-06-27 02:54:51 -07001654#ifdef CONFIG_RT_MUTEXES
Ingo Molnar36c8b582006-07-03 00:25:41 -07001655extern int rt_mutex_getprio(struct task_struct *p);
1656extern void rt_mutex_setprio(struct task_struct *p, int prio);
1657extern void rt_mutex_adjust_pi(struct task_struct *p);
Ingo Molnarb29739f2006-06-27 02:54:51 -07001658#else
Alexey Dobriyane8681712007-10-26 12:17:22 +04001659static inline int rt_mutex_getprio(struct task_struct *p)
Ingo Molnarb29739f2006-06-27 02:54:51 -07001660{
1661 return p->normal_prio;
1662}
Thomas Gleixner95e02ca2006-06-27 02:55:02 -07001663# define rt_mutex_adjust_pi(p) do { } while (0)
Ingo Molnarb29739f2006-06-27 02:54:51 -07001664#endif
1665
Ingo Molnar36c8b582006-07-03 00:25:41 -07001666extern void set_user_nice(struct task_struct *p, long nice);
1667extern int task_prio(const struct task_struct *p);
1668extern int task_nice(const struct task_struct *p);
1669extern int can_nice(const struct task_struct *p, const int nice);
1670extern int task_curr(const struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671extern int idle_cpu(int cpu);
1672extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
Rusty Russell961ccdd2008-06-23 13:55:38 +10001673extern int sched_setscheduler_nocheck(struct task_struct *, int,
1674 struct sched_param *);
Ingo Molnar36c8b582006-07-03 00:25:41 -07001675extern struct task_struct *idle_task(int cpu);
1676extern struct task_struct *curr_task(int cpu);
1677extern void set_curr_task(int cpu, struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678
1679void yield(void);
1680
1681/*
1682 * The default (Linux) execution domain.
1683 */
1684extern struct exec_domain default_exec_domain;
1685
1686union thread_union {
1687 struct thread_info thread_info;
1688 unsigned long stack[THREAD_SIZE/sizeof(long)];
1689};
1690
1691#ifndef __HAVE_ARCH_KSTACK_END
1692static inline int kstack_end(void *addr)
1693{
1694 /* Reliable end of stack detection:
1695 * Some APM bios versions misalign the stack
1696 */
1697 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1698}
1699#endif
1700
1701extern union thread_union init_thread_union;
1702extern struct task_struct init_task;
1703
1704extern struct mm_struct init_mm;
1705
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001706extern struct pid_namespace init_pid_ns;
1707
1708/*
1709 * find a task by one of its numerical ids
1710 *
1711 * find_task_by_pid_type_ns():
1712 * it is the most generic call - it finds a task by all id,
1713 * type and namespace specified
1714 * find_task_by_pid_ns():
1715 * finds a task by its pid in the specified namespace
Pavel Emelyanov228ebcb2007-10-18 23:40:16 -07001716 * find_task_by_vpid():
1717 * finds a task by its virtual pid
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001718 * find_task_by_pid():
1719 * finds a task by its global pid
1720 *
Pavel Emelyanove49859e2008-07-25 01:48:36 -07001721 * see also find_vpid() etc in include/linux/pid.h
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001722 */
1723
1724extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1725 struct pid_namespace *ns);
1726
Pavel Emelyanov5cd20452008-04-30 00:54:24 -07001727static inline struct task_struct *__deprecated find_task_by_pid(pid_t nr)
1728{
1729 return find_task_by_pid_type_ns(PIDTYPE_PID, nr, &init_pid_ns);
1730}
Pavel Emelyanov228ebcb2007-10-18 23:40:16 -07001731extern struct task_struct *find_task_by_vpid(pid_t nr);
1732extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1733 struct pid_namespace *ns);
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001734
Oleg Nesterov8520d7c2008-02-08 04:19:09 -08001735extern void __set_special_pids(struct pid *pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736
1737/* per-UID process charging. */
Cedric Le Goateracce2922007-07-15 23:40:59 -07001738extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739static inline struct user_struct *get_uid(struct user_struct *u)
1740{
1741 atomic_inc(&u->__count);
1742 return u;
1743}
1744extern void free_uid(struct user_struct *);
1745extern void switch_uid(struct user_struct *);
Pavel Emelyanov28f300d2007-09-18 22:46:45 -07001746extern void release_uids(struct user_namespace *ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747
1748#include <asm/current.h>
1749
Atsushi Nemoto3171a032006-09-29 02:00:32 -07001750extern void do_timer(unsigned long ticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751
Harvey Harrisonb3c97522008-02-13 15:03:15 -08001752extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1753extern int wake_up_process(struct task_struct *tsk);
1754extern void wake_up_new_task(struct task_struct *tsk,
1755 unsigned long clone_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756#ifdef CONFIG_SMP
1757 extern void kick_process(struct task_struct *tsk);
1758#else
1759 static inline void kick_process(struct task_struct *tsk) { }
1760#endif
Ingo Molnarad46c2c2007-07-09 18:52:00 +02001761extern void sched_fork(struct task_struct *p, int clone_flags);
1762extern void sched_dead(struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763
1764extern int in_group_p(gid_t);
1765extern int in_egroup_p(gid_t);
1766
1767extern void proc_caches_init(void);
1768extern void flush_signals(struct task_struct *);
Oleg Nesterov10ab8252007-05-09 02:34:37 -07001769extern void ignore_signals(struct task_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770extern void flush_signal_handlers(struct task_struct *, int force_default);
1771extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1772
1773static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1774{
1775 unsigned long flags;
1776 int ret;
1777
1778 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1779 ret = dequeue_signal(tsk, mask, info);
1780 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1781
1782 return ret;
1783}
1784
1785extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1786 sigset_t *mask);
1787extern void unblock_all_signals(void);
1788extern void release_task(struct task_struct * p);
1789extern int send_sig_info(int, struct siginfo *, struct task_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790extern int force_sigsegv(int, struct task_struct *);
1791extern int force_sig_info(int, struct siginfo *, struct task_struct *);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001792extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001793extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
Eric W. Biederman2425c082006-10-02 02:17:28 -07001794extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001795extern int kill_pgrp(struct pid *pid, int sig, int priv);
1796extern int kill_pid(struct pid *pid, int sig, int priv);
Matthew Wilcoxc3de4b32007-02-09 08:11:47 -07001797extern int kill_proc_info(int, struct siginfo *, pid_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798extern void do_notify_parent(struct task_struct *, int);
1799extern void force_sig(int, struct task_struct *);
1800extern void force_sig_specific(int, struct task_struct *);
1801extern int send_sig(int, struct task_struct *, int);
1802extern void zap_other_threads(struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803extern struct sigqueue *sigqueue_alloc(void);
1804extern void sigqueue_free(struct sigqueue *);
Oleg Nesterovac5c2152008-04-30 00:52:57 -07001805extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
Oleg Nesterov9ac95f22006-02-09 22:41:50 +03001806extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1808
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001809static inline int kill_cad_pid(int sig, int priv)
1810{
1811 return kill_pid(cad_pid, sig, priv);
1812}
1813
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814/* These can be the second arg to send_sig_info/send_group_sig_info. */
1815#define SEND_SIG_NOINFO ((struct siginfo *) 0)
1816#define SEND_SIG_PRIV ((struct siginfo *) 1)
1817#define SEND_SIG_FORCED ((struct siginfo *) 2)
1818
Oleg Nesterov621d3122005-10-30 15:03:45 -08001819static inline int is_si_special(const struct siginfo *info)
1820{
1821 return info <= SEND_SIG_FORCED;
1822}
1823
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824/* True if we are on the alternate signal stack. */
1825
1826static inline int on_sig_stack(unsigned long sp)
1827{
1828 return (sp - current->sas_ss_sp < current->sas_ss_size);
1829}
1830
1831static inline int sas_ss_flags(unsigned long sp)
1832{
1833 return (current->sas_ss_size == 0 ? SS_DISABLE
1834 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1835}
1836
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837/*
1838 * Routines for handling mm_structs
1839 */
1840extern struct mm_struct * mm_alloc(void);
1841
1842/* mmdrop drops the mm and the page tables */
Harvey Harrisonb3c97522008-02-13 15:03:15 -08001843extern void __mmdrop(struct mm_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844static inline void mmdrop(struct mm_struct * mm)
1845{
Ingo Molnar6fb43d72007-07-09 18:52:01 +02001846 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 __mmdrop(mm);
1848}
1849
1850/* mmput gets rid of the mappings and all user-space */
1851extern void mmput(struct mm_struct *);
1852/* Grab a reference to a task's mm, if it is not already going away */
1853extern struct mm_struct *get_task_mm(struct task_struct *task);
1854/* Remove the current tasks stale references to the old mm_struct */
1855extern void mm_release(struct task_struct *, struct mm_struct *);
Carsten Otte402b0862008-03-25 18:47:10 +01001856/* Allocate a new mm structure and copy contents from tsk->mm */
1857extern struct mm_struct *dup_mm(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858
1859extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1860extern void flush_thread(void);
1861extern void exit_thread(void);
1862
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863extern void exit_files(struct task_struct *);
Oleg Nesterov6b3934e2006-03-28 16:11:16 -08001864extern void __cleanup_signal(struct signal_struct *);
Oleg Nesterova7e53282006-03-28 16:11:27 -08001865extern void __cleanup_sighand(struct sighand_struct *);
Oleg Nesterovcbaffba2008-05-26 20:55:42 +04001866
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867extern void exit_itimers(struct signal_struct *);
Oleg Nesterovcbaffba2008-05-26 20:55:42 +04001868extern void flush_itimer_signals(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869
1870extern NORET_TYPE void do_group_exit(int);
1871
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872extern void daemonize(const char *, ...);
1873extern int allow_signal(int);
1874extern int disallow_signal(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875
1876extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1877extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
Ingo Molnar36c8b582006-07-03 00:25:41 -07001878struct task_struct *fork_idle(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879
1880extern void set_task_comm(struct task_struct *tsk, char *from);
Andrew Morton59714d62008-02-04 22:27:21 -08001881extern char *get_task_comm(char *to, struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882
1883#ifdef CONFIG_SMP
Ingo Molnar36c8b582006-07-03 00:25:41 -07001884extern void wait_task_inactive(struct task_struct * p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885#else
1886#define wait_task_inactive(p) do { } while (0)
1887#endif
1888
Eric W. Biederman5e85d4a2006-04-18 22:20:16 -07001889#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890
1891#define for_each_process(p) \
1892 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1893
1894/*
1895 * Careful: do_each_thread/while_each_thread is a double loop so
1896 * 'break' will not work as expected - use goto instead.
1897 */
1898#define do_each_thread(g, t) \
1899 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1900
1901#define while_each_thread(g, t) \
1902 while ((t = next_thread(t)) != g)
1903
Eric W. Biedermande12a782006-04-10 17:16:49 -06001904/* de_thread depends on thread_group_leader not being a pid based check */
1905#define thread_group_leader(p) (p == p->group_leader)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906
Eric W. Biederman0804ef42006-10-02 02:17:04 -07001907/* Do to the insanities of de_thread it is possible for a process
1908 * to have the pid of the thread group leader without actually being
1909 * the thread group leader. For iteration through the pids in proc
1910 * all we care about is that we have a task with the appropriate
1911 * pid, we don't actually care if we have the right task.
1912 */
Alexey Dobriyane8681712007-10-26 12:17:22 +04001913static inline int has_group_leader_pid(struct task_struct *p)
Eric W. Biederman0804ef42006-10-02 02:17:04 -07001914{
1915 return p->pid == p->tgid;
1916}
1917
Pavel Emelyanovbac0abd2007-10-18 23:40:18 -07001918static inline
1919int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1920{
1921 return p1->tgid == p2->tgid;
1922}
1923
Ingo Molnar36c8b582006-07-03 00:25:41 -07001924static inline struct task_struct *next_thread(const struct task_struct *p)
Oleg Nesterov47e65322006-03-28 16:11:25 -08001925{
1926 return list_entry(rcu_dereference(p->thread_group.next),
Ingo Molnar36c8b582006-07-03 00:25:41 -07001927 struct task_struct, thread_group);
Oleg Nesterov47e65322006-03-28 16:11:25 -08001928}
1929
Alexey Dobriyane8681712007-10-26 12:17:22 +04001930static inline int thread_group_empty(struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931{
Oleg Nesterov47e65322006-03-28 16:11:25 -08001932 return list_empty(&p->thread_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933}
1934
1935#define delay_group_leader(p) \
1936 (thread_group_leader(p) && !thread_group_empty(p))
1937
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938/*
Eric W. Biederman260ea102006-06-23 02:05:18 -07001939 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
Jens Axboe22e2c502005-06-27 10:55:12 +02001940 * subscriptions and synchronises with wait4(). Also used in procfs. Also
Paul Menageddbcc7e2007-10-18 23:39:30 -07001941 * pins the final release of task.io_context. Also protects ->cpuset and
1942 * ->cgroup.subsys[].
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 *
1944 * Nests both inside and outside of read_lock(&tasklist_lock).
1945 * It must not be nested with write_lock_irq(&tasklist_lock),
1946 * neither inside nor outside.
1947 */
1948static inline void task_lock(struct task_struct *p)
1949{
1950 spin_lock(&p->alloc_lock);
1951}
1952
1953static inline void task_unlock(struct task_struct *p)
1954{
1955 spin_unlock(&p->alloc_lock);
1956}
1957
Oleg Nesterovf63ee722006-03-28 16:11:13 -08001958extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1959 unsigned long *flags);
1960
1961static inline void unlock_task_sighand(struct task_struct *tsk,
1962 unsigned long *flags)
1963{
1964 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1965}
1966
Al Virof0373602005-11-13 16:06:57 -08001967#ifndef __HAVE_THREAD_FUNCTIONS
1968
Roman Zippelf7e42172007-05-09 02:35:17 -07001969#define task_thread_info(task) ((struct thread_info *)(task)->stack)
1970#define task_stack_page(task) ((task)->stack)
Al Viroa1261f52005-11-13 16:06:55 -08001971
Al Viro10ebffd2005-11-13 16:06:56 -08001972static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1973{
1974 *task_thread_info(p) = *task_thread_info(org);
1975 task_thread_info(p)->task = p;
1976}
1977
1978static inline unsigned long *end_of_stack(struct task_struct *p)
1979{
Roman Zippelf7e42172007-05-09 02:35:17 -07001980 return (unsigned long *)(task_thread_info(p) + 1);
Al Viro10ebffd2005-11-13 16:06:56 -08001981}
1982
Al Virof0373602005-11-13 16:06:57 -08001983#endif
1984
FUJITA Tomonori8b05c7e2008-07-23 21:26:53 -07001985static inline int object_is_on_stack(void *obj)
1986{
1987 void *stack = task_stack_page(current);
1988
1989 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
1990}
1991
Benjamin Herrenschmidt8c9843e2008-04-18 16:56:15 +10001992extern void thread_info_cache_init(void);
1993
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994/* set thread flags in other task's structures
1995 * - see asm/thread_info.h for TIF_xxxx flags available
1996 */
1997static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1998{
Al Viroa1261f52005-11-13 16:06:55 -08001999 set_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000}
2001
2002static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2003{
Al Viroa1261f52005-11-13 16:06:55 -08002004 clear_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005}
2006
2007static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2008{
Al Viroa1261f52005-11-13 16:06:55 -08002009 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010}
2011
2012static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2013{
Al Viroa1261f52005-11-13 16:06:55 -08002014 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002015}
2016
2017static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2018{
Al Viroa1261f52005-11-13 16:06:55 -08002019 return test_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020}
2021
2022static inline void set_tsk_need_resched(struct task_struct *tsk)
2023{
2024 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2025}
2026
2027static inline void clear_tsk_need_resched(struct task_struct *tsk)
2028{
2029 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2030}
2031
Gregory Haskins8ae121a2008-04-23 07:13:29 -04002032static inline int test_tsk_need_resched(struct task_struct *tsk)
2033{
2034 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2035}
2036
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037static inline int signal_pending(struct task_struct *p)
2038{
2039 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2040}
Matthew Wilcoxf776d122007-12-06 11:15:50 -05002041
Harvey Harrisonb3c97522008-02-13 15:03:15 -08002042extern int __fatal_signal_pending(struct task_struct *p);
Matthew Wilcoxf776d122007-12-06 11:15:50 -05002043
2044static inline int fatal_signal_pending(struct task_struct *p)
2045{
2046 return signal_pending(p) && __fatal_signal_pending(p);
2047}
2048
Oleg Nesterov16882c12008-06-08 21:20:41 +04002049static inline int signal_pending_state(long state, struct task_struct *p)
2050{
2051 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2052 return 0;
2053 if (!signal_pending(p))
2054 return 0;
2055
Oleg Nesterov16882c12008-06-08 21:20:41 +04002056 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2057}
2058
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059static inline int need_resched(void)
2060{
Linus Torvalds9404ef02008-05-12 10:14:22 -07002061 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062}
2063
2064/*
2065 * cond_resched() and cond_resched_lock(): latency reduction via
2066 * explicit rescheduling in places that are safe. The return
2067 * value indicates whether a reschedule was done in fact.
2068 * cond_resched_lock() will drop the spinlock before scheduling,
2069 * cond_resched_softirq() will enable bhs before scheduling.
2070 */
Linus Torvaldsc3921ab2008-05-11 16:04:48 -07002071extern int _cond_resched(void);
Linus Torvaldsc714a532008-05-12 13:34:13 -07002072#ifdef CONFIG_PREEMPT_BKL
Herbert Xu02b67cc32008-01-25 21:08:28 +01002073static inline int cond_resched(void)
2074{
2075 return 0;
2076}
2077#else
Herbert Xu02b67cc32008-01-25 21:08:28 +01002078static inline int cond_resched(void)
2079{
2080 return _cond_resched();
2081}
2082#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083extern int cond_resched_lock(spinlock_t * lock);
2084extern int cond_resched_softirq(void);
Linus Torvaldsc3921ab2008-05-11 16:04:48 -07002085static inline int cond_resched_bkl(void)
2086{
2087 return _cond_resched();
2088}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089
2090/*
2091 * Does a critical section need to be broken due to another
Nick Piggin95c354f2008-01-30 13:31:20 +01002092 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2093 * but a general need for low latency)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094 */
Nick Piggin95c354f2008-01-30 13:31:20 +01002095static inline int spin_needbreak(spinlock_t *lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096{
Nick Piggin95c354f2008-01-30 13:31:20 +01002097#ifdef CONFIG_PREEMPT
2098 return spin_is_contended(lock);
2099#else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100 return 0;
Nick Piggin95c354f2008-01-30 13:31:20 +01002101#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102}
2103
Roland McGrath7bb44ad2007-05-23 13:57:44 -07002104/*
2105 * Reevaluate whether the task has signals pending delivery.
2106 * Wake the task if so.
2107 * This is required every time the blocked sigset_t changes.
2108 * callers must hold sighand->siglock.
2109 */
2110extern void recalc_sigpending_and_wake(struct task_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002111extern void recalc_sigpending(void);
2112
2113extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2114
2115/*
2116 * Wrappers for p->thread_info->cpu access. No-op on UP.
2117 */
2118#ifdef CONFIG_SMP
2119
2120static inline unsigned int task_cpu(const struct task_struct *p)
2121{
Al Viroa1261f52005-11-13 16:06:55 -08002122 return task_thread_info(p)->cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123}
2124
Ingo Molnarc65cc872007-07-09 18:51:58 +02002125extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126
2127#else
2128
2129static inline unsigned int task_cpu(const struct task_struct *p)
2130{
2131 return 0;
2132}
2133
2134static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2135{
2136}
2137
2138#endif /* CONFIG_SMP */
2139
2140#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
2141extern void arch_pick_mmap_layout(struct mm_struct *mm);
2142#else
2143static inline void arch_pick_mmap_layout(struct mm_struct *mm)
2144{
2145 mm->mmap_base = TASK_UNMAPPED_BASE;
2146 mm->get_unmapped_area = arch_get_unmapped_area;
2147 mm->unmap_area = arch_unmap_area;
2148}
2149#endif
2150
Ingo Molnar1a3c3032008-05-12 21:20:52 +02002151#ifdef CONFIG_TRACING
2152extern void
2153__trace_special(void *__tr, void *__data,
2154 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2155#else
2156static inline void
2157__trace_special(void *__tr, void *__data,
2158 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2159{
2160}
2161#endif
2162
Mike Travisb53e9212008-04-04 18:11:08 -07002163extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
2165
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -07002166extern int sched_mc_power_savings, sched_smt_power_savings;
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -07002167
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168extern void normalize_rt_tasks(void);
2169
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002170#ifdef CONFIG_GROUP_SCHED
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002171
Ingo Molnar4cf86d72007-10-15 17:00:14 +02002172extern struct task_group init_task_group;
Peter Zijlstraeff766a2008-04-19 19:45:00 +02002173#ifdef CONFIG_USER_SCHED
2174extern struct task_group root_task_group;
2175#endif
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002176
Dhaval Gianiec7dc8a2008-04-19 19:44:59 +02002177extern struct task_group *sched_create_group(struct task_group *parent);
Ingo Molnar4cf86d72007-10-15 17:00:14 +02002178extern void sched_destroy_group(struct task_group *tg);
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002179extern void sched_move_task(struct task_struct *tsk);
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002180#ifdef CONFIG_FAIR_GROUP_SCHED
Ingo Molnar4cf86d72007-10-15 17:00:14 +02002181extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
Dhaval Giani5cb350b2007-10-15 17:00:14 +02002182extern unsigned long sched_group_shares(struct task_group *tg);
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002183#endif
2184#ifdef CONFIG_RT_GROUP_SCHED
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +01002185extern int sched_group_set_rt_runtime(struct task_group *tg,
2186 long rt_runtime_us);
2187extern long sched_group_rt_runtime(struct task_group *tg);
Peter Zijlstrad0b27fa2008-04-19 19:44:57 +02002188extern int sched_group_set_rt_period(struct task_group *tg,
2189 long rt_period_us);
2190extern long sched_group_rt_period(struct task_group *tg);
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002191#endif
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002192#endif
2193
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08002194#ifdef CONFIG_TASK_XACCT
2195static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2196{
2197 tsk->rchar += amt;
2198}
2199
2200static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2201{
2202 tsk->wchar += amt;
2203}
2204
2205static inline void inc_syscr(struct task_struct *tsk)
2206{
2207 tsk->syscr++;
2208}
2209
2210static inline void inc_syscw(struct task_struct *tsk)
2211{
2212 tsk->syscw++;
2213}
2214#else
2215static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2216{
2217}
2218
2219static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2220{
2221}
2222
2223static inline void inc_syscr(struct task_struct *tsk)
2224{
2225}
2226
2227static inline void inc_syscw(struct task_struct *tsk)
2228{
2229}
2230#endif
2231
Adrian Bunke6fe6642007-11-09 22:39:39 +01002232#ifdef CONFIG_SMP
2233void migration_init(void);
2234#else
2235static inline void migration_init(void)
2236{
2237}
2238#endif
2239
Dave Hansen82455252008-02-04 22:28:59 -08002240#ifndef TASK_SIZE_OF
2241#define TASK_SIZE_OF(tsk) TASK_SIZE
2242#endif
2243
Balbir Singhcf475ad2008-04-29 01:00:16 -07002244#ifdef CONFIG_MM_OWNER
2245extern void mm_update_next_owner(struct mm_struct *mm);
2246extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2247#else
2248static inline void mm_update_next_owner(struct mm_struct *mm)
2249{
2250}
2251
2252static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2253{
2254}
2255#endif /* CONFIG_MM_OWNER */
2256
Steven Rostedt7c731e02008-05-12 21:20:41 +02002257#define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2258
Linus Torvalds1da177e2005-04-16 15:20:36 -07002259#endif /* __KERNEL__ */
2260
2261#endif