blob: c5d3f847ca8d05bd52ca575608c2d428a23d1b28 [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 Molnar23f78d42006-06-27 02:54:53 -070080#include <linux/rtmutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
David Woodhousea3b67142006-04-25 14:54:40 +010082#include <linux/time.h>
83#include <linux/param.h>
84#include <linux/resource.h>
85#include <linux/timer.h>
86#include <linux/hrtimer.h>
Andrew Morton7c3ab732006-12-10 02:19:19 -080087#include <linux/task_io_accounting.h>
Dhaval Giani5cb350b2007-10-15 17:00:14 +020088#include <linux/kobject.h>
Arjan van de Ven97455122008-01-25 21:08:34 +010089#include <linux/latencytop.h>
David 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);
Peter Williams2dd73a42006-06-27 02:54:34 -0700137extern unsigned long weighted_cpuload(const int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200139struct seq_file;
140struct cfs_rq;
Ingo Molnar4cf86d72007-10-15 17:00:14 +0200141struct task_group;
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200142#ifdef CONFIG_SCHED_DEBUG
143extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
144extern void proc_sched_set_task(struct task_struct *p);
145extern void
Ingo Molnar5cef9ec2007-08-09 11:16:47 +0200146print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200147#else
148static inline void
149proc_sched_show_task(struct task_struct *p, struct seq_file *m)
150{
151}
152static inline void proc_sched_set_task(struct task_struct *p)
153{
154}
155static inline void
Ingo Molnar5cef9ec2007-08-09 11:16:47 +0200156print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200157{
158}
159#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Ingo Molnar690229a2008-04-23 09:31:35 +0200161extern unsigned long long time_sync_thresh;
162
Linus Torvalds4a8342d2005-09-29 15:18:21 -0700163/*
164 * Task state bitmask. NOTE! These bits are also
165 * encoded in fs/proc/array.c: get_task_state().
166 *
167 * We have two separate sets of flags: task->state
168 * is about runnability, while task->exit_state are
169 * about the task exiting. Confusing, but this way
170 * modifying one set can't modify the other one by
171 * mistake.
172 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173#define TASK_RUNNING 0
174#define TASK_INTERRUPTIBLE 1
175#define TASK_UNINTERRUPTIBLE 2
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500176#define __TASK_STOPPED 4
177#define __TASK_TRACED 8
Linus Torvalds4a8342d2005-09-29 15:18:21 -0700178/* in tsk->exit_state */
179#define EXIT_ZOMBIE 16
180#define EXIT_DEAD 32
181/* in tsk->state again */
Mike Galbraithaf927232007-10-15 17:00:13 +0200182#define TASK_DEAD 64
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500183#define TASK_WAKEKILL 128
184
185/* Convenience macros for the sake of set_task_state */
186#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
187#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
188#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500190/* Convenience macros for the sake of wake_up */
191#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500192#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500193
194/* get_task_state() */
195#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500196 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
197 __TASK_TRACED)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500198
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500199#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
200#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500201#define task_is_stopped_or_traced(task) \
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500202 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500203#define task_contributes_to_load(task) \
204 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206#define __set_task_state(tsk, state_value) \
207 do { (tsk)->state = (state_value); } while (0)
208#define set_task_state(tsk, state_value) \
209 set_mb((tsk)->state, (state_value))
210
Andrew Morton498d0c52005-09-13 01:25:14 -0700211/*
212 * set_current_state() includes a barrier so that the write of current->state
213 * is correctly serialised wrt the caller's subsequent test of whether to
214 * actually sleep:
215 *
216 * set_current_state(TASK_UNINTERRUPTIBLE);
217 * if (do_i_need_to_sleep())
218 * schedule();
219 *
220 * If the caller does not need such serialisation then use __set_current_state()
221 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222#define __set_current_state(state_value) \
223 do { current->state = (state_value); } while (0)
224#define set_current_state(state_value) \
225 set_mb(current->state, (state_value))
226
227/* Task command name length */
228#define TASK_COMM_LEN 16
229
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230#include <linux/spinlock.h>
231
232/*
233 * This serializes "schedule()" and also protects
234 * the run-queue from deletions/modifications (but
235 * _adding_ to the beginning of the run-queue has
236 * a separate lock).
237 */
238extern rwlock_t tasklist_lock;
239extern spinlock_t mmlist_lock;
240
Ingo Molnar36c8b582006-07-03 00:25:41 -0700241struct task_struct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
243extern void sched_init(void);
244extern void sched_init_smp(void);
Harvey Harrison2d07b252008-02-15 09:56:34 -0800245extern asmlinkage void schedule_tail(struct task_struct *prev);
Ingo Molnar36c8b582006-07-03 00:25:41 -0700246extern void init_idle(struct task_struct *idle, int cpu);
Ingo Molnar1df21052007-07-09 18:51:58 +0200247extern void init_idle_bootup_task(struct task_struct *idle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249extern cpumask_t nohz_cpu_mask;
Siddha, Suresh B46cb4b72007-05-08 00:32:51 -0700250#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
251extern int select_nohz_load_balancer(int cpu);
252#else
253static inline int select_nohz_load_balancer(int cpu)
254{
255 return 0;
256}
257#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Peter Zijlstra48d5e252008-01-25 21:08:31 +0100259extern unsigned long rt_needs_cpu(int cpu);
260
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800261/*
Ingo Molnar39bc89f2007-04-25 20:50:03 -0700262 * Only dump TASK_* tasks. (0 for all tasks)
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800263 */
264extern void show_state_filter(unsigned long state_filter);
265
266static inline void show_state(void)
267{
Ingo Molnar39bc89f2007-04-25 20:50:03 -0700268 show_state_filter(0);
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800269}
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271extern void show_regs(struct pt_regs *);
272
273/*
274 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
275 * task), SP is the stack pointer of the first frame that should be shown in the back
276 * trace (or NULL if the entire call-chain of the task should be shown).
277 */
278extern void show_stack(struct task_struct *task, unsigned long *sp);
279
280void io_schedule(void);
281long io_schedule_timeout(long timeout);
282
283extern void cpu_init (void);
284extern void trap_init(void);
Paul Mackerrasfa13a5a2007-11-09 22:39:38 +0100285extern void account_process_tick(struct task_struct *task, int user);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286extern void update_process_times(int user);
287extern void scheduler_tick(void);
Peter Zijlstra8f4d37e2008-01-25 21:08:29 +0100288extern void hrtick_resched(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100290extern void sched_show_task(struct task_struct *p);
291
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700292#ifdef CONFIG_DETECT_SOFTLOCKUP
Ingo Molnar6687a972006-03-24 03:18:41 -0800293extern void softlockup_tick(void);
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700294extern void spawn_softlockup_task(void);
295extern void touch_softlockup_watchdog(void);
Jeremy Fitzhardinge04c91672007-05-08 00:28:05 -0700296extern void touch_all_softlockup_watchdogs(void);
Ingo Molnar90739082008-01-25 21:08:34 +0100297extern unsigned long softlockup_thresh;
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100298extern unsigned long sysctl_hung_task_check_count;
299extern unsigned long sysctl_hung_task_timeout_secs;
Ingo Molnar90739082008-01-25 21:08:34 +0100300extern unsigned long sysctl_hung_task_warnings;
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700301#else
Ingo Molnar6687a972006-03-24 03:18:41 -0800302static inline void softlockup_tick(void)
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700303{
304}
305static inline void spawn_softlockup_task(void)
306{
307}
308static inline void touch_softlockup_watchdog(void)
309{
310}
Jeremy Fitzhardinge04c91672007-05-08 00:28:05 -0700311static inline void touch_all_softlockup_watchdogs(void)
312{
313}
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700314#endif
315
316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317/* Attach to any functions which should be ignored in wchan output. */
318#define __sched __attribute__((__section__(".sched.text")))
Ingo Molnardeaf2222007-11-28 15:52:56 +0100319
320/* Linker adds these: start and end of __sched functions */
321extern char __sched_text_start[], __sched_text_end[];
322
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323/* Is this address in the __sched functions? */
324extern int in_sched_functions(unsigned long addr);
325
326#define MAX_SCHEDULE_TIMEOUT LONG_MAX
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800327extern signed long schedule_timeout(signed long timeout);
Nishanth Aravamudan64ed93a2005-09-10 00:27:21 -0700328extern signed long schedule_timeout_interruptible(signed long timeout);
Matthew Wilcox294d5cc2007-12-06 11:59:46 -0500329extern signed long schedule_timeout_killable(signed long timeout);
Nishanth Aravamudan64ed93a2005-09-10 00:27:21 -0700330extern signed long schedule_timeout_uninterruptible(signed long timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331asmlinkage void schedule(void);
332
Serge E. Hallynab516012006-10-02 02:18:06 -0700333struct nsproxy;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700334struct user_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336/* Maximum number of active map areas.. This is a random (large) number */
337#define DEFAULT_MAX_MAP_COUNT 65536
338
339extern int sysctl_max_map_count;
340
341#include <linux/aio.h>
342
343extern unsigned long
344arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
345 unsigned long, unsigned long);
346extern unsigned long
347arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
348 unsigned long len, unsigned long pgoff,
349 unsigned long flags);
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700350extern void arch_unmap_area(struct mm_struct *, unsigned long);
351extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700353#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
354/*
355 * The mm counters are not protected by its page_table_lock,
356 * so must be incremented atomically.
357 */
Christoph Lameterd3cb4872006-01-06 00:11:20 -0800358#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
359#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
360#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
361#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
362#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700363
364#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
365/*
366 * The mm counters are protected by its page_table_lock,
367 * so can be incremented directly.
368 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
370#define get_mm_counter(mm, member) ((mm)->_##member)
371#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
372#define inc_mm_counter(mm, member) (mm)->_##member++
373#define dec_mm_counter(mm, member) (mm)->_##member--
Hugh Dickins42946212005-10-29 18:16:05 -0700374
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700375#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
376
377#define get_mm_rss(mm) \
378 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
Hugh Dickins365e9c872005-10-29 18:16:18 -0700379#define update_hiwater_rss(mm) do { \
380 unsigned long _rss = get_mm_rss(mm); \
381 if ((mm)->hiwater_rss < _rss) \
382 (mm)->hiwater_rss = _rss; \
383} while (0)
384#define update_hiwater_vm(mm) do { \
385 if ((mm)->hiwater_vm < (mm)->total_vm) \
386 (mm)->hiwater_vm = (mm)->total_vm; \
387} while (0)
388
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700389extern void set_dumpable(struct mm_struct *mm, int value);
390extern int get_dumpable(struct mm_struct *mm);
391
392/* mm flags */
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700393/* dumpable bits */
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700394#define MMF_DUMPABLE 0 /* core dump is permitted */
395#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700396#define MMF_DUMPABLE_BITS 2
397
398/* coredump filter bits */
399#define MMF_DUMP_ANON_PRIVATE 2
400#define MMF_DUMP_ANON_SHARED 3
401#define MMF_DUMP_MAPPED_PRIVATE 4
402#define MMF_DUMP_MAPPED_SHARED 5
Roland McGrath82df3972007-10-16 23:27:02 -0700403#define MMF_DUMP_ELF_HEADERS 6
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700404#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
Roland McGrath82df3972007-10-16 23:27:02 -0700405#define MMF_DUMP_FILTER_BITS 5
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700406#define MMF_DUMP_FILTER_MASK \
407 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
408#define MMF_DUMP_FILTER_DEFAULT \
409 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411struct sighand_struct {
412 atomic_t count;
413 struct k_sigaction action[_NSIG];
414 spinlock_t siglock;
Davide Libenzib8fceee2007-09-20 12:40:16 -0700415 wait_queue_head_t signalfd_wqh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416};
417
KaiGai Kohei0e464812006-06-25 05:49:24 -0700418struct pacct_struct {
KaiGai Koheif6ec29a2006-06-25 05:49:25 -0700419 int ac_flag;
420 long ac_exitcode;
KaiGai Kohei0e464812006-06-25 05:49:24 -0700421 unsigned long ac_mem;
KaiGai Kohei77787bf2006-06-25 05:49:26 -0700422 cputime_t ac_utime, ac_stime;
423 unsigned long ac_minflt, ac_majflt;
KaiGai Kohei0e464812006-06-25 05:49:24 -0700424};
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426/*
427 * NOTE! "signal_struct" does not have it's own
428 * locking, because a shared signal_struct always
429 * implies a shared sighand_struct, so locking
430 * sighand_struct is always a proper superset of
431 * the locking of signal_struct.
432 */
433struct signal_struct {
434 atomic_t count;
435 atomic_t live;
436
437 wait_queue_head_t wait_chldexit; /* for wait4() */
438
439 /* current thread group signal load-balancing target: */
Ingo Molnar36c8b582006-07-03 00:25:41 -0700440 struct task_struct *curr_target;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
442 /* shared signal handling: */
443 struct sigpending shared_pending;
444
445 /* thread group exit support */
446 int group_exit_code;
447 /* overloaded:
448 * - notify group_exit_task when ->count is equal to notify_count
449 * - everyone except group_exit_task is stopped during signal delivery
450 * of fatal signals, group_exit_task processes the signal.
451 */
452 struct task_struct *group_exit_task;
453 int notify_count;
454
455 /* thread group stop support, overloads group_exit_code too */
456 int group_stop_count;
457 unsigned int flags; /* see SIGNAL_* flags below */
458
459 /* POSIX.1b Interval Timers */
460 struct list_head posix_timers;
461
462 /* ITIMER_REAL timer for the process */
Thomas Gleixner2ff678b2006-01-09 20:52:34 -0800463 struct hrtimer real_timer;
Oleg Nesterovfea9d172008-02-08 04:19:19 -0800464 struct pid *leader_pid;
Thomas Gleixner2ff678b2006-01-09 20:52:34 -0800465 ktime_t it_real_incr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
467 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
468 cputime_t it_prof_expires, it_virt_expires;
469 cputime_t it_prof_incr, it_virt_incr;
470
471 /* job control IDs */
Pavel Emelyanov9a2e7052007-10-18 23:40:39 -0700472
473 /*
474 * pgrp and session fields are deprecated.
475 * use the task_session_Xnr and task_pgrp_Xnr routines below
476 */
477
478 union {
479 pid_t pgrp __deprecated;
480 pid_t __pgrp;
481 };
482
Eric W. Biedermanab521dc2007-02-12 00:53:00 -0800483 struct pid *tty_old_pgrp;
Cedric Le Goater1ec320a2006-12-08 02:37:55 -0800484
485 union {
486 pid_t session __deprecated;
487 pid_t __session;
488 };
489
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 /* boolean value for session group leader */
491 int leader;
492
493 struct tty_struct *tty; /* NULL if no tty */
494
495 /*
496 * Cumulative resource counters for dead threads in the group,
497 * and for reaped dead child processes forked by this group.
498 * Live threads maintain their own counters and add to these
499 * in __exit_signal, except for the group leader.
500 */
501 cputime_t utime, stime, cutime, cstime;
Laurent Vivier9ac52312007-10-15 17:00:19 +0200502 cputime_t gtime;
503 cputime_t cgtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
505 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
Eric Dumazet6eaeeab2007-05-10 22:22:37 -0700506 unsigned long inblock, oublock, cinblock, coublock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
508 /*
509 * Cumulative ns of scheduled CPU time for dead threads in the
510 * group, not including a zombie group leader. (This only differs
511 * from jiffies_to_ns(utime + stime) if sched_clock uses something
512 * other than jiffies.)
513 */
Ingo Molnar41b86e92007-07-09 18:51:58 +0200514 unsigned long long sum_sched_runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
516 /*
517 * We don't bother to synchronize most readers of this at all,
518 * because there is no reader checking a limit that actually needs
519 * to get both rlim_cur and rlim_max atomically, and either one
520 * alone is a single word that can safely be read normally.
521 * getrlimit/setrlimit use task_lock(current->group_leader) to
522 * protect this instead of the siglock, because they really
523 * have no need to disable irqs.
524 */
525 struct rlimit rlim[RLIM_NLIMITS];
526
527 struct list_head cpu_timers[3];
528
529 /* keep the process-shared keyrings here so that they do the right
530 * thing in threads created with CLONE_THREAD */
531#ifdef CONFIG_KEYS
532 struct key *session_keyring; /* keyring inherited over fork */
533 struct key *process_keyring; /* keyring private to this process */
534#endif
KaiGai Kohei0e464812006-06-25 05:49:24 -0700535#ifdef CONFIG_BSD_PROCESS_ACCT
536 struct pacct_struct pacct; /* per-process accounting information */
537#endif
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700538#ifdef CONFIG_TASKSTATS
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700539 struct taskstats *stats;
540#endif
Miloslav Trmac522ed772007-07-15 23:40:56 -0700541#ifdef CONFIG_AUDIT
542 unsigned audit_tty;
543 struct tty_audit_buf *tty_audit_buf;
544#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545};
546
Nick Piggin4866cde2005-06-25 14:57:23 -0700547/* Context switch must be unlocked if interrupts are to be enabled */
548#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
549# define __ARCH_WANT_UNLOCKED_CTXSW
550#endif
551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552/*
553 * Bits in flags field of signal_struct.
554 */
555#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
556#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
557#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
558#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
Oleg Nesterove4420552008-04-30 00:52:44 -0700559/*
560 * Pending notifications to parent.
561 */
562#define SIGNAL_CLD_STOPPED 0x00000010
563#define SIGNAL_CLD_CONTINUED 0x00000020
564#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Oleg Nesterovfae5fa42008-04-30 00:53:03 -0700566#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
567
Oleg Nesteroved5d2ca2008-02-04 22:27:24 -0800568/* If true, all threads except ->group_exit_task have pending SIGKILL */
569static inline int signal_group_exit(const struct signal_struct *sig)
570{
571 return (sig->flags & SIGNAL_GROUP_EXIT) ||
572 (sig->group_exit_task != NULL);
573}
574
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575/*
576 * Some day this will be a full-fledged user tracking system..
577 */
578struct user_struct {
579 atomic_t __count; /* reference count */
580 atomic_t processes; /* How many processes does this user have? */
581 atomic_t files; /* How many open files does this user have? */
582 atomic_t sigpending; /* How many pending signals does this user have? */
Amy Griffis2d9048e2006-06-01 13:10:59 -0700583#ifdef CONFIG_INOTIFY_USER
Robert Love0eeca282005-07-12 17:06:03 -0400584 atomic_t inotify_watches; /* How many inotify watches does this user have? */
585 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
586#endif
Alexey Dobriyan970a8642007-10-16 23:30:09 -0700587#ifdef CONFIG_POSIX_MQUEUE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 /* protected by mq_lock */
589 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
Alexey Dobriyan970a8642007-10-16 23:30:09 -0700590#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 unsigned long locked_shm; /* How many pages of mlocked shm ? */
592
593#ifdef CONFIG_KEYS
594 struct key *uid_keyring; /* UID specific keyring */
595 struct key *session_keyring; /* UID's default session keyring */
596#endif
597
598 /* Hash table maintenance information */
Pavel Emelyanov735de222007-09-18 22:46:44 -0700599 struct hlist_node uidhash_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 uid_t uid;
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200601
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100602#ifdef CONFIG_USER_SCHED
Ingo Molnar4cf86d72007-10-15 17:00:14 +0200603 struct task_group *tg;
Dhaval Gianib1a8c172007-10-17 16:55:11 +0200604#ifdef CONFIG_SYSFS
Kay Sieverseb41d942007-11-02 13:47:53 +0100605 struct kobject kobj;
Dhaval Giani5cb350b2007-10-15 17:00:14 +0200606 struct work_struct work;
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200607#endif
Dhaval Gianib1a8c172007-10-17 16:55:11 +0200608#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609};
610
Kay Sieverseb41d942007-11-02 13:47:53 +0100611extern int uids_sysfs_init(void);
Dhaval Giani5cb350b2007-10-15 17:00:14 +0200612
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613extern struct user_struct *find_user(uid_t);
614
615extern struct user_struct root_user;
616#define INIT_USER (&root_user)
617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618struct backing_dev_info;
619struct reclaim_state;
620
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700621#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622struct sched_info {
623 /* cumulative counters */
Ingo Molnar2d723762007-10-15 17:00:12 +0200624 unsigned long pcount; /* # of times run on this cpu */
Balbir Singh172ba842007-07-09 18:52:00 +0200625 unsigned long long cpu_time, /* time spent on the cpu */
626 run_delay; /* time spent waiting on a runqueue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
628 /* timestamps */
Balbir Singh172ba842007-07-09 18:52:00 +0200629 unsigned long long last_arrival,/* when we last ran on a cpu */
630 last_queued; /* when we were last queued to run */
Ingo Molnarb8efb562007-10-15 17:00:10 +0200631#ifdef CONFIG_SCHEDSTATS
632 /* BKL stats */
Ken Chen480b9432007-10-18 21:32:56 +0200633 unsigned int bkl_count;
Ingo Molnarb8efb562007-10-15 17:00:10 +0200634#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635};
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700636#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700638#ifdef CONFIG_SCHEDSTATS
Helge Deller15ad7cd2006-12-06 20:40:36 -0800639extern const struct file_operations proc_schedstat_operations;
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700640#endif /* CONFIG_SCHEDSTATS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
Shailabh Nagarca74e922006-07-14 00:24:36 -0700642#ifdef CONFIG_TASK_DELAY_ACCT
643struct task_delay_info {
644 spinlock_t lock;
645 unsigned int flags; /* Private per-task flags */
646
647 /* For each stat XXX, add following, aligned appropriately
648 *
649 * struct timespec XXX_start, XXX_end;
650 * u64 XXX_delay;
651 * u32 XXX_count;
652 *
653 * Atomicity of updates to XXX_delay, XXX_count protected by
654 * single lock above (split into XXX_lock if contention is an issue).
655 */
Shailabh Nagar0ff92242006-07-14 00:24:37 -0700656
657 /*
658 * XXX_count is incremented on every XXX operation, the delay
659 * associated with the operation is added to XXX_delay.
660 * XXX_delay contains the accumulated delay time in nanoseconds.
661 */
662 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
663 u64 blkio_delay; /* wait for sync block io completion */
664 u64 swapin_delay; /* wait for swapin block io completion */
665 u32 blkio_count; /* total count of the number of sync block */
666 /* io operations performed */
667 u32 swapin_count; /* total count of the number of swapin block */
668 /* io operations performed */
Shailabh Nagarca74e922006-07-14 00:24:36 -0700669};
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700670#endif /* CONFIG_TASK_DELAY_ACCT */
671
672static inline int sched_info_on(void)
673{
674#ifdef CONFIG_SCHEDSTATS
675 return 1;
676#elif defined(CONFIG_TASK_DELAY_ACCT)
677 extern int delayacct_on;
678 return delayacct_on;
679#else
680 return 0;
Shailabh Nagarca74e922006-07-14 00:24:36 -0700681#endif
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700682}
Shailabh Nagarca74e922006-07-14 00:24:36 -0700683
Ingo Molnard15bcfd2007-07-09 18:51:57 +0200684enum cpu_idle_type {
685 CPU_IDLE,
686 CPU_NOT_IDLE,
687 CPU_NEWLY_IDLE,
688 CPU_MAX_IDLE_TYPES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689};
690
691/*
692 * sched-domains (multiprocessor balancing) declarations:
693 */
Ingo Molnar9aa7b362007-07-09 18:51:58 +0200694
695/*
696 * Increase resolution of nice-level calculations:
697 */
698#define SCHED_LOAD_SHIFT 10
699#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
700
Suresh Siddhaf8700df2007-08-23 15:18:02 +0200701#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
Peter Williams2dd73a42006-06-27 02:54:34 -0700703#ifdef CONFIG_SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
705#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
706#define SD_BALANCE_EXEC 4 /* Balance on exec */
Nick Piggin147cbb42005-06-25 14:57:19 -0700707#define SD_BALANCE_FORK 8 /* Balance on fork, clone */
708#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
709#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
710#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
711#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700712#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700713#define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
Christoph Lameter08c183f2006-12-10 02:20:29 -0800714#define SD_SERIALIZE 1024 /* Only a single load balancing instance */
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900715#define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700716
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700717#define BALANCE_FOR_MC_POWER \
718 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
719
720#define BALANCE_FOR_PKG_POWER \
721 ((sched_mc_power_savings || sched_smt_power_savings) ? \
722 SD_POWERSAVINGS_BALANCE : 0)
723
724#define test_sd_parent(sd, flag) ((sd->parent && \
725 (sd->parent->flags & flag)) ? 1 : 0)
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700726
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
728struct sched_group {
729 struct sched_group *next; /* Must be a circular list */
730 cpumask_t cpumask;
731
732 /*
733 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
734 * single CPU. This is read only (except for setup, hotplug CPU).
Eric Dumazet5517d862007-05-08 00:32:57 -0700735 * Note : Never change cpu_power without recompute its reciprocal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 */
Eric Dumazet5517d862007-05-08 00:32:57 -0700737 unsigned int __cpu_power;
738 /*
739 * reciprocal value of cpu_power to avoid expensive divides
740 * (see include/linux/reciprocal_div.h)
741 */
742 u32 reciprocal_cpu_power;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743};
744
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900745enum sched_domain_level {
746 SD_LV_NONE = 0,
747 SD_LV_SIBLING,
748 SD_LV_MC,
749 SD_LV_CPU,
750 SD_LV_NODE,
751 SD_LV_ALLNODES,
752 SD_LV_MAX
753};
754
755struct sched_domain_attr {
756 int relax_domain_level;
757};
758
759#define SD_ATTR_INIT (struct sched_domain_attr) { \
760 .relax_domain_level = -1, \
761}
762
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763struct sched_domain {
764 /* These fields must be setup */
765 struct sched_domain *parent; /* top domain must be null terminated */
Siddha, Suresh B1a848872006-10-03 01:14:08 -0700766 struct sched_domain *child; /* bottom domain must be null terminated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 struct sched_group *groups; /* the balancing groups of the domain */
768 cpumask_t span; /* span of all CPUs in this domain */
769 unsigned long min_interval; /* Minimum balance interval ms */
770 unsigned long max_interval; /* Maximum balance interval ms */
771 unsigned int busy_factor; /* less balancing by factor if busy */
772 unsigned int imbalance_pct; /* No balance until over watermark */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
Nick Piggin78979862005-06-25 14:57:13 -0700774 unsigned int busy_idx;
775 unsigned int idle_idx;
776 unsigned int newidle_idx;
777 unsigned int wake_idx;
Nick Piggin147cbb42005-06-25 14:57:19 -0700778 unsigned int forkexec_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 int flags; /* See SD_* */
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900780 enum sched_domain_level level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
782 /* Runtime fields. */
783 unsigned long last_balance; /* init to jiffies. units in jiffies */
784 unsigned int balance_interval; /* initialise to 1. units in ms. */
785 unsigned int nr_balance_failed; /* initialise to 0 */
786
787#ifdef CONFIG_SCHEDSTATS
788 /* load_balance() stats */
Ken Chen480b9432007-10-18 21:32:56 +0200789 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
790 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
791 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
792 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
793 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
794 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
795 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
796 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797
798 /* Active load balancing */
Ken Chen480b9432007-10-18 21:32:56 +0200799 unsigned int alb_count;
800 unsigned int alb_failed;
801 unsigned int alb_pushed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802
Nick Piggin68767a02005-06-25 14:57:20 -0700803 /* SD_BALANCE_EXEC stats */
Ken Chen480b9432007-10-18 21:32:56 +0200804 unsigned int sbe_count;
805 unsigned int sbe_balanced;
806 unsigned int sbe_pushed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
Nick Piggin68767a02005-06-25 14:57:20 -0700808 /* SD_BALANCE_FORK stats */
Ken Chen480b9432007-10-18 21:32:56 +0200809 unsigned int sbf_count;
810 unsigned int sbf_balanced;
811 unsigned int sbf_pushed;
Nick Piggin68767a02005-06-25 14:57:20 -0700812
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 /* try_to_wake_up() stats */
Ken Chen480b9432007-10-18 21:32:56 +0200814 unsigned int ttwu_wake_remote;
815 unsigned int ttwu_move_affine;
816 unsigned int ttwu_move_balance;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817#endif
818};
819
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900820extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
821 struct sched_domain_attr *dattr_new);
Heiko Carstens9aefd0a2008-03-12 18:31:58 +0100822extern int arch_reinit_sched_domains(void);
Paul Jackson029190c2007-10-18 23:40:20 -0700823
akpm@osdl.org198e2f12006-01-12 01:05:30 -0800824#endif /* CONFIG_SMP */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
Con Kolivasd02c7a82007-07-26 13:40:43 +0200826/*
827 * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
828 * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
829 * task of nice 0 or enough lower priority tasks to bring up the
830 * weighted_cpuload
831 */
832static inline int above_background_load(void)
833{
834 unsigned long cpu;
835
836 for_each_online_cpu(cpu) {
837 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
838 return 1;
839 }
840 return 0;
841}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
843struct io_context; /* See blkdev.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844#define NGROUPS_SMALL 32
Eric Dumazet1bf47342008-02-06 01:37:56 -0800845#define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846struct group_info {
847 int ngroups;
848 atomic_t usage;
849 gid_t small_block[NGROUPS_SMALL];
850 int nblocks;
851 gid_t *blocks[0];
852};
853
854/*
855 * get_group_info() must be called with the owning task locked (via task_lock())
856 * when task != current. The reason being that the vast majority of callers are
857 * looking at current->group_info, which can not be changed except by the
858 * current task. Changing current->group_info requires the task lock, too.
859 */
860#define get_group_info(group_info) do { \
861 atomic_inc(&(group_info)->usage); \
862} while (0)
863
864#define put_group_info(group_info) do { \
865 if (atomic_dec_and_test(&(group_info)->usage)) \
866 groups_free(group_info); \
867} while (0)
868
David Howells3e301482005-06-23 22:00:56 -0700869extern struct group_info *groups_alloc(int gidsetsize);
870extern void groups_free(struct group_info *group_info);
871extern int set_current_groups(struct group_info *group_info);
872extern int groups_search(struct group_info *group_info, gid_t grp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873/* access the groups "array" with this macro */
874#define GROUP_AT(gi, i) \
875 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
876
Chen, Kenneth W383f2832005-09-09 13:02:02 -0700877#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
Ingo Molnar36c8b582006-07-03 00:25:41 -0700878extern void prefetch_stack(struct task_struct *t);
Chen, Kenneth W383f2832005-09-09 13:02:02 -0700879#else
880static inline void prefetch_stack(struct task_struct *t) { }
881#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882
883struct audit_context; /* See audit.c */
884struct mempolicy;
Jens Axboeb92ce552006-04-11 13:52:07 +0200885struct pipe_inode_info;
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -0700886struct uts_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
Ingo Molnar20b8a592007-07-09 18:51:58 +0200888struct rq;
889struct sched_domain;
890
891struct sched_class {
Ingo Molnar5522d5d2007-10-15 17:00:12 +0200892 const struct sched_class *next;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200893
Ingo Molnarfd390f62007-08-09 11:16:48 +0200894 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
Ingo Molnarf02231e2007-08-09 11:16:48 +0200895 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
Dmitry Adamushko4530d7a2007-10-15 17:00:08 +0200896 void (*yield_task) (struct rq *rq);
Gregory Haskinse7693a32008-01-25 21:08:09 +0100897 int (*select_task_rq)(struct task_struct *p, int sync);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200898
899 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
900
Ingo Molnarfb8d4722007-08-09 11:16:48 +0200901 struct task_struct * (*pick_next_task) (struct rq *rq);
Ingo Molnar31ee5292007-08-09 11:16:49 +0200902 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200903
Peter Williams681f3e62007-10-24 18:23:51 +0200904#ifdef CONFIG_SMP
Peter Williams43010652007-08-09 11:16:46 +0200905 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
Peter Williamse1d14842007-10-24 18:23:51 +0200906 struct rq *busiest, unsigned long max_load_move,
Ingo Molnar20b8a592007-07-09 18:51:58 +0200907 struct sched_domain *sd, enum cpu_idle_type idle,
Peter Williamsa4ac01c2007-08-09 11:16:46 +0200908 int *all_pinned, int *this_best_prio);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200909
Peter Williamse1d14842007-10-24 18:23:51 +0200910 int (*move_one_task) (struct rq *this_rq, int this_cpu,
911 struct rq *busiest, struct sched_domain *sd,
912 enum cpu_idle_type idle);
Steven Rostedt9a897c52008-01-25 21:08:22 +0100913 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
914 void (*post_schedule) (struct rq *this_rq);
915 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
Peter Williams681f3e62007-10-24 18:23:51 +0200916#endif
Peter Williamse1d14842007-10-24 18:23:51 +0200917
Srivatsa Vaddagiri83b699e2007-10-15 17:00:08 +0200918 void (*set_curr_task) (struct rq *rq);
Peter Zijlstra8f4d37e2008-01-25 21:08:29 +0100919 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
Ingo Molnaree0827d2007-08-09 11:16:49 +0200920 void (*task_new) (struct rq *rq, struct task_struct *p);
Mike Traviscd8ba7c2008-03-26 14:23:49 -0700921 void (*set_cpus_allowed)(struct task_struct *p,
922 const cpumask_t *newmask);
Gregory Haskins57d885f2008-01-25 21:08:18 +0100923
924 void (*join_domain)(struct rq *rq);
925 void (*leave_domain)(struct rq *rq);
Steven Rostedtcb469842008-01-25 21:08:22 +0100926
927 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
928 int running);
929 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
930 int running);
931 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
932 int oldprio, int running);
Peter Zijlstra810b3812008-02-29 15:21:01 -0500933
934#ifdef CONFIG_FAIR_GROUP_SCHED
935 void (*moved_group) (struct task_struct *p);
936#endif
Ingo Molnar20b8a592007-07-09 18:51:58 +0200937};
938
939struct load_weight {
940 unsigned long weight, inv_weight;
941};
942
943/*
944 * CFS stats for a schedulable entity (task, task-group etc)
945 *
946 * Current field usage histogram:
947 *
948 * 4 se->block_start
949 * 4 se->run_node
950 * 4 se->sleep_start
Ingo Molnar20b8a592007-07-09 18:51:58 +0200951 * 6 se->load.weight
Ingo Molnar20b8a592007-07-09 18:51:58 +0200952 */
953struct sched_entity {
Ingo Molnar20b8a592007-07-09 18:51:58 +0200954 struct load_weight load; /* for load-balancing */
955 struct rb_node run_node;
Peter Zijlstra4a55bd52008-04-19 19:45:00 +0200956 struct list_head group_node;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200957 unsigned int on_rq;
958
Ingo Molnar20b8a592007-07-09 18:51:58 +0200959 u64 exec_start;
Ingo Molnar94c18222007-08-02 17:41:40 +0200960 u64 sum_exec_runtime;
Ingo Molnare9acbff2007-10-15 17:00:04 +0200961 u64 vruntime;
Ingo Molnarf6cf8912007-08-28 12:53:24 +0200962 u64 prev_sum_exec_runtime;
Ingo Molnar94c18222007-08-02 17:41:40 +0200963
Ingo Molnar4ae7d5c2008-03-19 01:42:00 +0100964 u64 last_wakeup;
965 u64 avg_overlap;
966
Ingo Molnar94c18222007-08-02 17:41:40 +0200967#ifdef CONFIG_SCHEDSTATS
968 u64 wait_start;
969 u64 wait_max;
Arjan van de Ven6d082592008-01-25 21:08:35 +0100970 u64 wait_count;
971 u64 wait_sum;
Ingo Molnar94c18222007-08-02 17:41:40 +0200972
973 u64 sleep_start;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200974 u64 sleep_max;
Ingo Molnar94c18222007-08-02 17:41:40 +0200975 s64 sum_sleep_runtime;
976
977 u64 block_start;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200978 u64 block_max;
979 u64 exec_max;
Ingo Molnareba1ed42007-10-15 17:00:02 +0200980 u64 slice_max;
Ingo Molnarcc367732007-10-15 17:00:18 +0200981
982 u64 nr_migrations;
983 u64 nr_migrations_cold;
984 u64 nr_failed_migrations_affine;
985 u64 nr_failed_migrations_running;
986 u64 nr_failed_migrations_hot;
987 u64 nr_forced_migrations;
988 u64 nr_forced2_migrations;
989
990 u64 nr_wakeups;
991 u64 nr_wakeups_sync;
992 u64 nr_wakeups_migrate;
993 u64 nr_wakeups_local;
994 u64 nr_wakeups_remote;
995 u64 nr_wakeups_affine;
996 u64 nr_wakeups_affine_attempts;
997 u64 nr_wakeups_passive;
998 u64 nr_wakeups_idle;
Ingo Molnar94c18222007-08-02 17:41:40 +0200999#endif
1000
Ingo Molnar20b8a592007-07-09 18:51:58 +02001001#ifdef CONFIG_FAIR_GROUP_SCHED
1002 struct sched_entity *parent;
1003 /* rq on which this entity is (to be) queued: */
1004 struct cfs_rq *cfs_rq;
1005 /* rq "owned" by this entity/group: */
1006 struct cfs_rq *my_q;
1007#endif
1008};
Ingo Molnar70b97a72006-07-03 00:25:42 -07001009
Peter Zijlstrafa717062008-01-25 21:08:27 +01001010struct sched_rt_entity {
1011 struct list_head run_list;
1012 unsigned int time_slice;
Peter Zijlstra78f2c7d2008-01-25 21:08:27 +01001013 unsigned long timeout;
Peter Zijlstra6f505b12008-01-25 21:08:30 +01001014 int nr_cpus_allowed;
1015
Peter Zijlstra58d6c2d2008-04-19 19:45:00 +02001016 struct sched_rt_entity *back;
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01001017#ifdef CONFIG_RT_GROUP_SCHED
Peter Zijlstra6f505b12008-01-25 21:08:30 +01001018 struct sched_rt_entity *parent;
1019 /* rq on which this entity is (to be) queued: */
1020 struct rt_rq *rt_rq;
1021 /* rq "owned" by this entity/group: */
1022 struct rt_rq *my_q;
1023#endif
Peter Zijlstrafa717062008-01-25 21:08:27 +01001024};
1025
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026struct task_struct {
1027 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
Roman Zippelf7e42172007-05-09 02:35:17 -07001028 void *stack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 atomic_t usage;
William Cohen97dc32c2007-05-08 00:23:41 -07001030 unsigned int flags; /* per process flags, defined below */
1031 unsigned int ptrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -07001033 int lock_depth; /* BKL lock depth */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
Peter Williams2dd73a42006-06-27 02:54:34 -07001035#ifdef CONFIG_SMP
1036#ifdef __ARCH_WANT_UNLOCKED_CTXSW
Nick Piggin4866cde2005-06-25 14:57:23 -07001037 int oncpu;
1038#endif
Peter Williams2dd73a42006-06-27 02:54:34 -07001039#endif
Ingo Molnar50e645a2007-07-09 18:52:00 +02001040
Ingo Molnarb29739f2006-06-27 02:54:51 -07001041 int prio, static_prio, normal_prio;
Ingo Molnar5522d5d2007-10-15 17:00:12 +02001042 const struct sched_class *sched_class;
Ingo Molnar20b8a592007-07-09 18:51:58 +02001043 struct sched_entity se;
Peter Zijlstrafa717062008-01-25 21:08:27 +01001044 struct sched_rt_entity rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
Avi Kivitye107be32007-07-26 13:40:43 +02001046#ifdef CONFIG_PREEMPT_NOTIFIERS
1047 /* list of struct preempt_notifier: */
1048 struct hlist_head preempt_notifiers;
1049#endif
1050
Alexey Dobriyan18796aa2007-10-16 23:30:26 -07001051 /*
1052 * fpu_counter contains the number of consecutive context switches
1053 * that the FPU is used. If this is over a threshold, the lazy fpu
1054 * saving becomes unlazy to save the trap. This is an unsigned char
1055 * so that after 256 times the counter wraps and the behavior turns
1056 * lazy again; this to deal with bursty apps that only use FPU for
1057 * a short time
1058 */
1059 unsigned char fpu_counter;
1060 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -07001061#ifdef CONFIG_BLK_DEV_IO_TRACE
Jens Axboe2056a782006-03-23 20:00:26 +01001062 unsigned int btrace_seq;
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -07001063#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064
William Cohen97dc32c2007-05-08 00:23:41 -07001065 unsigned int policy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 cpumask_t cpus_allowed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067
Paul E. McKenneye260be62008-01-25 21:08:24 +01001068#ifdef CONFIG_PREEMPT_RCU
1069 int rcu_read_lock_nesting;
1070 int rcu_flipctr_idx;
1071#endif /* #ifdef CONFIG_PREEMPT_RCU */
1072
Chandra Seetharaman52f17b62006-07-14 00:24:38 -07001073#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 struct sched_info sched_info;
1075#endif
1076
1077 struct list_head tasks;
1078 /*
1079 * ptrace_list/ptrace_children forms the list of my children
1080 * that were stolen by a ptracer.
1081 */
1082 struct list_head ptrace_children;
1083 struct list_head ptrace_list;
1084
1085 struct mm_struct *mm, *active_mm;
1086
1087/* task state */
1088 struct linux_binfmt *binfmt;
William Cohen97dc32c2007-05-08 00:23:41 -07001089 int exit_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 int exit_code, exit_signal;
1091 int pdeath_signal; /* The signal sent when the parent dies */
1092 /* ??? */
William Cohen97dc32c2007-05-08 00:23:41 -07001093 unsigned int personality;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094 unsigned did_exec:1;
1095 pid_t pid;
1096 pid_t tgid;
Arjan van de Ven0a425402006-09-26 10:52:38 +02001097
1098#ifdef CONFIG_CC_STACKPROTECTOR
1099 /* Canary value for the -fstack-protector gcc feature */
1100 unsigned long stack_canary;
1101#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 /*
1103 * pointers to (original) parent process, youngest child, younger sibling,
1104 * older sibling, respectively. (p->father can be replaced with
1105 * p->parent->pid)
1106 */
1107 struct task_struct *real_parent; /* real parent process (when being debugged) */
1108 struct task_struct *parent; /* parent process */
1109 /*
1110 * children/sibling forms the list of my children plus the
1111 * tasks I'm ptracing.
1112 */
1113 struct list_head children; /* list of my children */
1114 struct list_head sibling; /* linkage in my parent's children list */
1115 struct task_struct *group_leader; /* threadgroup leader */
1116
1117 /* PID/PID hash table linkage. */
Eric W. Biederman92476d72006-03-31 02:31:42 -08001118 struct pid_link pids[PIDTYPE_MAX];
Oleg Nesterov47e65322006-03-28 16:11:25 -08001119 struct list_head thread_group;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120
1121 struct completion *vfork_done; /* for vfork() */
1122 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1123 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1124
William Cohen97dc32c2007-05-08 00:23:41 -07001125 unsigned int rt_priority;
Michael Neulingc66f08b2007-10-18 03:06:34 -07001126 cputime_t utime, stime, utimescaled, stimescaled;
Laurent Vivier9ac52312007-10-15 17:00:19 +02001127 cputime_t gtime;
Balbir Singh93018992007-10-30 00:26:32 +01001128 cputime_t prev_utime, prev_stime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 unsigned long nvcsw, nivcsw; /* context switch counts */
Tomas Janousek924b42d2007-07-15 23:39:42 -07001130 struct timespec start_time; /* monotonic time */
1131 struct timespec real_start_time; /* boot based time */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1133 unsigned long min_flt, maj_flt;
1134
1135 cputime_t it_prof_expires, it_virt_expires;
1136 unsigned long long it_sched_expires;
1137 struct list_head cpu_timers[3];
1138
1139/* process credentials */
1140 uid_t uid,euid,suid,fsuid;
1141 gid_t gid,egid,sgid,fsgid;
1142 struct group_info *group_info;
Serge E. Hallyn3b7391d2008-02-04 22:29:45 -08001143 kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset;
Andrew G. Morgan3898b1b2008-04-28 02:13:40 -07001144 unsigned securebits;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 struct user_struct *user;
1146#ifdef CONFIG_KEYS
David Howellsb5f545c2006-01-08 01:02:47 -08001147 struct key *request_key_auth; /* assumed request_key authority */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 struct key *thread_keyring; /* keyring private to this thread */
David Howells3e301482005-06-23 22:00:56 -07001149 unsigned char jit_keyring; /* default keyring to attach requested keys to */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150#endif
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -07001151 char comm[TASK_COMM_LEN]; /* executable name excluding path
1152 - access with [gs]et_task_comm (which lock
1153 it with task_lock())
1154 - initialized normally by flush_old_exec */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155/* file system info */
1156 int link_count, total_link_count;
Alexey Dobriyan3d5b6fc2006-09-29 01:59:40 -07001157#ifdef CONFIG_SYSVIPC
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158/* ipc stuff */
1159 struct sysv_sem sysvsem;
Alexey Dobriyan3d5b6fc2006-09-29 01:59:40 -07001160#endif
Ingo Molnar82a1fcb2008-01-25 21:08:02 +01001161#ifdef CONFIG_DETECT_SOFTLOCKUP
1162/* hung task detection */
1163 unsigned long last_switch_timestamp;
1164 unsigned long last_switch_count;
1165#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166/* CPU-specific state of this task */
1167 struct thread_struct thread;
1168/* filesystem information */
1169 struct fs_struct *fs;
1170/* open file information */
1171 struct files_struct *files;
Serge E. Hallyn1651e142006-10-02 02:18:08 -07001172/* namespaces */
Serge E. Hallynab516012006-10-02 02:18:06 -07001173 struct nsproxy *nsproxy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174/* signal handlers */
1175 struct signal_struct *signal;
1176 struct sighand_struct *sighand;
1177
1178 sigset_t blocked, real_blocked;
Roland McGrathf3de2722008-04-30 00:53:09 -07001179 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 struct sigpending pending;
1181
1182 unsigned long sas_ss_sp;
1183 size_t sas_ss_size;
1184 int (*notifier)(void *priv);
1185 void *notifier_data;
1186 sigset_t *notifier_mask;
Alexey Dobriyan57c521c2007-10-16 23:31:35 -07001187#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 void *security;
Alexey Dobriyan57c521c2007-10-16 23:31:35 -07001189#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 struct audit_context *audit_context;
Al Virobfef93a2008-01-10 04:53:18 -05001191#ifdef CONFIG_AUDITSYSCALL
1192 uid_t loginuid;
Eric Paris4746ec52008-01-08 10:06:53 -05001193 unsigned int sessionid;
Al Virobfef93a2008-01-10 04:53:18 -05001194#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 seccomp_t seccomp;
1196
1197/* Thread group tracking */
1198 u32 parent_exec_id;
1199 u32 self_exec_id;
1200/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1201 spinlock_t alloc_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
Ingo Molnarb29739f2006-06-27 02:54:51 -07001203 /* Protection of the PI data structures: */
1204 spinlock_t pi_lock;
1205
Ingo Molnar23f78d42006-06-27 02:54:53 -07001206#ifdef CONFIG_RT_MUTEXES
1207 /* PI waiters blocked on a rt_mutex held by this task */
1208 struct plist_head pi_waiters;
1209 /* Deadlock detection and priority inheritance handling */
1210 struct rt_mutex_waiter *pi_blocked_on;
Ingo Molnar23f78d42006-06-27 02:54:53 -07001211#endif
1212
Ingo Molnar408894e2006-01-09 15:59:20 -08001213#ifdef CONFIG_DEBUG_MUTEXES
1214 /* mutex deadlock detection */
1215 struct mutex_waiter *blocked_on;
1216#endif
Ingo Molnarde30a2b2006-07-03 00:24:42 -07001217#ifdef CONFIG_TRACE_IRQFLAGS
1218 unsigned int irq_events;
1219 int hardirqs_enabled;
1220 unsigned long hardirq_enable_ip;
1221 unsigned int hardirq_enable_event;
1222 unsigned long hardirq_disable_ip;
1223 unsigned int hardirq_disable_event;
1224 int softirqs_enabled;
1225 unsigned long softirq_disable_ip;
1226 unsigned int softirq_disable_event;
1227 unsigned long softirq_enable_ip;
1228 unsigned int softirq_enable_event;
1229 int hardirq_context;
1230 int softirq_context;
1231#endif
Ingo Molnarfbb9ce92006-07-03 00:24:50 -07001232#ifdef CONFIG_LOCKDEP
Peter Zijlstrabdb94412008-02-25 23:02:48 +01001233# define MAX_LOCK_DEPTH 48UL
Ingo Molnarfbb9ce92006-07-03 00:24:50 -07001234 u64 curr_chain_key;
1235 int lockdep_depth;
1236 struct held_lock held_locks[MAX_LOCK_DEPTH];
1237 unsigned int lockdep_recursion;
1238#endif
Ingo Molnar408894e2006-01-09 15:59:20 -08001239
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240/* journalling filesystem info */
1241 void *journal_info;
1242
Neil Brownd89d8792007-05-01 09:53:42 +02001243/* stacked block device info */
1244 struct bio *bio_list, **bio_tail;
1245
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246/* VM state */
1247 struct reclaim_state *reclaim_state;
1248
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 struct backing_dev_info *backing_dev_info;
1250
1251 struct io_context *io_context;
1252
1253 unsigned long ptrace_message;
1254 siginfo_t *last_siginfo; /* For ptrace use. */
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001255#ifdef CONFIG_TASK_XACCT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256/* i/o counters(bytes read/written, #syscalls */
1257 u64 rchar, wchar, syscr, syscw;
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001258#endif
Andrew Morton7c3ab732006-12-10 02:19:19 -08001259 struct task_io_accounting ioac;
Jay Lan8f0ab512006-09-30 23:28:59 -07001260#if defined(CONFIG_TASK_XACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 u64 acct_rss_mem1; /* accumulated rss usage */
1262 u64 acct_vm_mem1; /* accumulated virtual memory usage */
Jay Landb5fed22006-09-30 23:29:00 -07001263 cputime_t acct_stimexpd;/* stime since last update */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264#endif
1265#ifdef CONFIG_NUMA
1266 struct mempolicy *mempolicy;
1267 short il_next;
1268#endif
1269#ifdef CONFIG_CPUSETS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 nodemask_t mems_allowed;
1271 int cpuset_mems_generation;
Paul Jackson825a46a2006-03-24 03:16:03 -08001272 int cpuset_mem_spread_rotor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273#endif
Paul Menageddbcc7e2007-10-18 23:39:30 -07001274#ifdef CONFIG_CGROUPS
Paul Menage817929e2007-10-18 23:39:36 -07001275 /* Control Group info protected by css_set_lock */
1276 struct css_set *cgroups;
1277 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1278 struct list_head cg_list;
Paul Menageddbcc7e2007-10-18 23:39:30 -07001279#endif
Alexey Dobriyan42b2dd02007-10-16 23:27:30 -07001280#ifdef CONFIG_FUTEX
Ingo Molnar0771dfe2006-03-27 01:16:22 -08001281 struct robust_list_head __user *robust_list;
Ingo Molnar34f192c2006-03-27 01:16:24 -08001282#ifdef CONFIG_COMPAT
1283 struct compat_robust_list_head __user *compat_robust_list;
1284#endif
Ingo Molnarc87e2832006-06-27 02:54:58 -07001285 struct list_head pi_state_list;
1286 struct futex_pi_state *pi_state_cache;
Alexey Dobriyan42b2dd02007-10-16 23:27:30 -07001287#endif
Jens Axboe22e2c502005-06-27 10:55:12 +02001288 atomic_t fs_excl; /* holding fs exclusive resources */
Ingo Molnare56d0902006-01-08 01:01:37 -08001289 struct rcu_head rcu;
Jens Axboeb92ce552006-04-11 13:52:07 +02001290
1291 /*
1292 * cache last used pipe for splice
1293 */
1294 struct pipe_inode_info *splice_pipe;
Shailabh Nagarca74e922006-07-14 00:24:36 -07001295#ifdef CONFIG_TASK_DELAY_ACCT
1296 struct task_delay_info *delays;
1297#endif
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001298#ifdef CONFIG_FAULT_INJECTION
1299 int make_it_fail;
1300#endif
Peter Zijlstra3e26c142007-10-16 23:25:50 -07001301 struct prop_local_single dirties;
Arjan van de Ven97455122008-01-25 21:08:34 +01001302#ifdef CONFIG_LATENCYTOP
1303 int latency_record_count;
1304 struct latency_record latency_record[LT_SAVECOUNT];
1305#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306};
1307
Ingo Molnare05606d2007-07-09 18:51:59 +02001308/*
1309 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1310 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1311 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1312 * values are inverted: lower p->prio value means higher priority.
1313 *
1314 * The MAX_USER_RT_PRIO value allows the actual maximum
1315 * RT priority to be separate from the value exported to
1316 * user-space. This allows kernel threads to set their
1317 * priority to a value higher than any user task. Note:
1318 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1319 */
1320
1321#define MAX_USER_RT_PRIO 100
1322#define MAX_RT_PRIO MAX_USER_RT_PRIO
1323
1324#define MAX_PRIO (MAX_RT_PRIO + 40)
1325#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1326
1327static inline int rt_prio(int prio)
1328{
1329 if (unlikely(prio < MAX_RT_PRIO))
1330 return 1;
1331 return 0;
1332}
1333
Alexey Dobriyane8681712007-10-26 12:17:22 +04001334static inline int rt_task(struct task_struct *p)
Ingo Molnare05606d2007-07-09 18:51:59 +02001335{
1336 return rt_prio(p->prio);
1337}
1338
Pavel Emelianova47afb02007-10-18 23:39:46 -07001339static inline void set_task_session(struct task_struct *tsk, pid_t session)
Cedric Le Goater937949d2006-12-08 02:37:54 -08001340{
Pavel Emelianova47afb02007-10-18 23:39:46 -07001341 tsk->signal->__session = session;
Cedric Le Goater937949d2006-12-08 02:37:54 -08001342}
1343
Pavel Emelyanov9a2e7052007-10-18 23:40:39 -07001344static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1345{
1346 tsk->signal->__pgrp = pgrp;
1347}
1348
Alexey Dobriyane8681712007-10-26 12:17:22 +04001349static inline struct pid *task_pid(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001350{
1351 return task->pids[PIDTYPE_PID].pid;
1352}
1353
Alexey Dobriyane8681712007-10-26 12:17:22 +04001354static inline struct pid *task_tgid(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001355{
1356 return task->group_leader->pids[PIDTYPE_PID].pid;
1357}
1358
Alexey Dobriyane8681712007-10-26 12:17:22 +04001359static inline struct pid *task_pgrp(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001360{
1361 return task->group_leader->pids[PIDTYPE_PGID].pid;
1362}
1363
Alexey Dobriyane8681712007-10-26 12:17:22 +04001364static inline struct pid *task_session(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001365{
1366 return task->group_leader->pids[PIDTYPE_SID].pid;
1367}
1368
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001369struct pid_namespace;
1370
1371/*
1372 * the helpers to get the task's different pids as they are seen
1373 * from various namespaces
1374 *
1375 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
Eric W. Biederman44c4e1b2008-02-08 04:19:15 -08001376 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1377 * current.
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001378 * task_xid_nr_ns() : id seen from the ns specified;
1379 *
1380 * set_task_vxid() : assigns a virtual id to a task;
1381 *
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001382 * see also pid_nr() etc in include/linux/pid.h
1383 */
1384
Alexey Dobriyane8681712007-10-26 12:17:22 +04001385static inline pid_t task_pid_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001386{
1387 return tsk->pid;
1388}
1389
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001390pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001391
1392static inline pid_t task_pid_vnr(struct task_struct *tsk)
1393{
1394 return pid_vnr(task_pid(tsk));
1395}
1396
1397
Alexey Dobriyane8681712007-10-26 12:17:22 +04001398static inline pid_t task_tgid_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001399{
1400 return tsk->tgid;
1401}
1402
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001403pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001404
1405static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1406{
1407 return pid_vnr(task_tgid(tsk));
1408}
1409
1410
Alexey Dobriyane8681712007-10-26 12:17:22 +04001411static inline pid_t task_pgrp_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001412{
Pavel Emelyanov9a2e7052007-10-18 23:40:39 -07001413 return tsk->signal->__pgrp;
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001414}
1415
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001416pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001417
1418static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1419{
1420 return pid_vnr(task_pgrp(tsk));
1421}
1422
1423
Alexey Dobriyane8681712007-10-26 12:17:22 +04001424static inline pid_t task_session_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001425{
1426 return tsk->signal->__session;
1427}
1428
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001429pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001430
1431static inline pid_t task_session_vnr(struct task_struct *tsk)
1432{
1433 return pid_vnr(task_session(tsk));
1434}
1435
1436
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437/**
1438 * pid_alive - check that a task structure is not stale
1439 * @p: Task structure to be checked.
1440 *
1441 * Test if a process is not yet dead (at most zombie state)
1442 * If pid_alive fails, then pointers within the task structure
1443 * can be stale and must not be dereferenced.
1444 */
Alexey Dobriyane8681712007-10-26 12:17:22 +04001445static inline int pid_alive(struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446{
Eric W. Biederman92476d72006-03-31 02:31:42 -08001447 return p->pids[PIDTYPE_PID].pid != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448}
1449
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001450/**
Serge E. Hallynb460cbc2007-10-18 23:39:52 -07001451 * is_global_init - check if a task structure is init
Henne32602592006-10-06 00:44:01 -07001452 * @tsk: Task structure to be checked.
1453 *
1454 * Check if a task structure is the first user space task the kernel created.
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001455 */
Alexey Dobriyane8681712007-10-26 12:17:22 +04001456static inline int is_global_init(struct task_struct *tsk)
Pavel Emelyanovb461cc02007-10-18 23:40:09 -07001457{
1458 return tsk->pid == 1;
1459}
Serge E. Hallynb460cbc2007-10-18 23:39:52 -07001460
1461/*
1462 * is_container_init:
1463 * check whether in the task is init in its own pid namespace.
1464 */
Pavel Emelyanovb461cc02007-10-18 23:40:09 -07001465extern int is_container_init(struct task_struct *tsk);
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001466
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001467extern struct pid *cad_pid;
1468
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469extern void free_task(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
Ingo Molnare56d0902006-01-08 01:01:37 -08001471
Andrew Morton158d9eb2006-03-31 02:31:34 -08001472extern void __put_task_struct(struct task_struct *t);
Ingo Molnare56d0902006-01-08 01:01:37 -08001473
1474static inline void put_task_struct(struct task_struct *t)
1475{
1476 if (atomic_dec_and_test(&t->usage))
Eric W. Biederman8c7904a2006-03-31 02:31:37 -08001477 __put_task_struct(t);
Ingo Molnare56d0902006-01-08 01:01:37 -08001478}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479
1480/*
1481 * Per process flags
1482 */
1483#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1484 /* Not implemented yet, only for 486*/
1485#define PF_STARTING 0x00000002 /* being created */
1486#define PF_EXITING 0x00000004 /* getting shut down */
Alexey Kuznetsov778e9a92007-06-08 13:47:00 -07001487#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
Laurent Vivier94886b82007-10-15 17:00:19 +02001488#define PF_VCPU 0x00000010 /* I'm a virtual CPU */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1490#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1491#define PF_DUMPCORE 0x00000200 /* dumped core */
1492#define PF_SIGNALED 0x00000400 /* killed by a signal */
1493#define PF_MEMALLOC 0x00000800 /* Allocating memory */
1494#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1495#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1497#define PF_FROZEN 0x00010000 /* frozen for system suspend */
1498#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1499#define PF_KSWAPD 0x00040000 /* I am kswapd */
1500#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1501#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
Jens Axboeb31dc662006-06-13 08:26:10 +02001502#define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1503#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1504#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1505#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1506#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
Paul Jacksonc61afb12006-03-24 03:16:08 -08001507#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
Thomas Gleixner61a87122006-06-27 02:54:56 -07001508#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
Rafael J. Wysockiba96a0c2007-05-23 13:57:25 -07001509#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510
1511/*
1512 * Only the _current_ task can read/write to tsk->flags, but other
1513 * tasks can access tsk->flags in readonly mode for example
1514 * with tsk_used_math (like during threaded core dumping).
1515 * There is however an exception to this rule during ptrace
1516 * or during fork: the ptracer task is allowed to write to the
1517 * child->flags of its traced child (same goes for fork, the parent
1518 * can write to the child->flags), because we're guaranteed the
1519 * child is not running and in turn not changing child->flags
1520 * at the same time the parent does it.
1521 */
1522#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1523#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1524#define clear_used_math() clear_stopped_child_used_math(current)
1525#define set_used_math() set_stopped_child_used_math(current)
1526#define conditional_stopped_child_used_math(condition, child) \
1527 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1528#define conditional_used_math(condition) \
1529 conditional_stopped_child_used_math(condition, current)
1530#define copy_to_stopped_child_used_math(child) \
1531 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1532/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1533#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1534#define used_math() tsk_used_math(current)
1535
1536#ifdef CONFIG_SMP
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001537extern int set_cpus_allowed_ptr(struct task_struct *p,
1538 const cpumask_t *new_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539#else
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001540static inline int set_cpus_allowed_ptr(struct task_struct *p,
1541 const cpumask_t *new_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542{
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001543 if (!cpu_isset(0, *new_mask))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544 return -EINVAL;
1545 return 0;
1546}
1547#endif
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001548static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1549{
1550 return set_cpus_allowed_ptr(p, &new_mask);
1551}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552
1553extern unsigned long long sched_clock(void);
Ingo Molnare436d802007-07-19 21:28:35 +02001554
Peter Zijlstra3e51f332008-05-03 18:29:28 +02001555#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1556static inline void sched_clock_init(void)
1557{
1558}
1559
1560static inline u64 sched_clock_cpu(int cpu)
1561{
1562 return sched_clock();
1563}
1564
1565static inline void sched_clock_tick(void)
1566{
1567}
1568
1569static inline void sched_clock_idle_sleep_event(void)
1570{
1571}
1572
1573static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1574{
1575}
1576#else
1577extern void sched_clock_init(void);
1578extern u64 sched_clock_cpu(int cpu);
1579extern void sched_clock_tick(void);
1580extern void sched_clock_idle_sleep_event(void);
1581extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1582#endif
1583
Ingo Molnare436d802007-07-19 21:28:35 +02001584/*
1585 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1586 * clock constructed from sched_clock():
1587 */
1588extern unsigned long long cpu_clock(int cpu);
1589
Ingo Molnar36c8b582006-07-03 00:25:41 -07001590extern unsigned long long
Ingo Molnar41b86e92007-07-09 18:51:58 +02001591task_sched_runtime(struct task_struct *task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592
1593/* sched_exec is called by processes performing an exec */
1594#ifdef CONFIG_SMP
1595extern void sched_exec(void);
1596#else
1597#define sched_exec() {}
1598#endif
1599
Ingo Molnar2aa44d02007-08-23 15:18:02 +02001600extern void sched_clock_idle_sleep_event(void);
1601extern void sched_clock_idle_wakeup_event(u64 delta_ns);
Ingo Molnarbb29ab22007-07-09 18:51:59 +02001602
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603#ifdef CONFIG_HOTPLUG_CPU
1604extern void idle_task_exit(void);
1605#else
1606static inline void idle_task_exit(void) {}
1607#endif
1608
1609extern void sched_idle_next(void);
Ingo Molnarb29739f2006-06-27 02:54:51 -07001610
Thomas Gleixner06d83082008-03-22 09:20:24 +01001611#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1612extern void wake_up_idle_cpu(int cpu);
1613#else
1614static inline void wake_up_idle_cpu(int cpu) { }
1615#endif
1616
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001617#ifdef CONFIG_SCHED_DEBUG
Peter Zijlstra21805082007-08-25 18:41:53 +02001618extern unsigned int sysctl_sched_latency;
Peter Zijlstrab2be5e92007-11-09 22:39:37 +01001619extern unsigned int sysctl_sched_min_granularity;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001620extern unsigned int sysctl_sched_wakeup_granularity;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001621extern unsigned int sysctl_sched_child_runs_first;
1622extern unsigned int sysctl_sched_features;
Ingo Molnarda84d962007-10-15 17:00:18 +02001623extern unsigned int sysctl_sched_migration_cost;
Peter Zijlstrab82d9fd2007-11-09 22:39:39 +01001624extern unsigned int sysctl_sched_nr_migrate;
Peter Zijlstrab2be5e92007-11-09 22:39:37 +01001625
1626int sched_nr_latency_handler(struct ctl_table *table, int write,
1627 struct file *file, void __user *buffer, size_t *length,
1628 loff_t *ppos);
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001629#endif
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +01001630extern unsigned int sysctl_sched_rt_period;
1631extern int sysctl_sched_rt_runtime;
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001632
Peter Zijlstrad0b27fa2008-04-19 19:44:57 +02001633int sched_rt_handler(struct ctl_table *table, int write,
1634 struct file *filp, void __user *buffer, size_t *lenp,
1635 loff_t *ppos);
1636
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001637extern unsigned int sysctl_sched_compat_yield;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001638
Ingo Molnarb29739f2006-06-27 02:54:51 -07001639#ifdef CONFIG_RT_MUTEXES
Ingo Molnar36c8b582006-07-03 00:25:41 -07001640extern int rt_mutex_getprio(struct task_struct *p);
1641extern void rt_mutex_setprio(struct task_struct *p, int prio);
1642extern void rt_mutex_adjust_pi(struct task_struct *p);
Ingo Molnarb29739f2006-06-27 02:54:51 -07001643#else
Alexey Dobriyane8681712007-10-26 12:17:22 +04001644static inline int rt_mutex_getprio(struct task_struct *p)
Ingo Molnarb29739f2006-06-27 02:54:51 -07001645{
1646 return p->normal_prio;
1647}
Thomas Gleixner95e02ca2006-06-27 02:55:02 -07001648# define rt_mutex_adjust_pi(p) do { } while (0)
Ingo Molnarb29739f2006-06-27 02:54:51 -07001649#endif
1650
Ingo Molnar36c8b582006-07-03 00:25:41 -07001651extern void set_user_nice(struct task_struct *p, long nice);
1652extern int task_prio(const struct task_struct *p);
1653extern int task_nice(const struct task_struct *p);
1654extern int can_nice(const struct task_struct *p, const int nice);
1655extern int task_curr(const struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656extern int idle_cpu(int cpu);
1657extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
Ingo Molnar36c8b582006-07-03 00:25:41 -07001658extern struct task_struct *idle_task(int cpu);
1659extern struct task_struct *curr_task(int cpu);
1660extern void set_curr_task(int cpu, struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661
1662void yield(void);
1663
1664/*
1665 * The default (Linux) execution domain.
1666 */
1667extern struct exec_domain default_exec_domain;
1668
1669union thread_union {
1670 struct thread_info thread_info;
1671 unsigned long stack[THREAD_SIZE/sizeof(long)];
1672};
1673
1674#ifndef __HAVE_ARCH_KSTACK_END
1675static inline int kstack_end(void *addr)
1676{
1677 /* Reliable end of stack detection:
1678 * Some APM bios versions misalign the stack
1679 */
1680 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1681}
1682#endif
1683
1684extern union thread_union init_thread_union;
1685extern struct task_struct init_task;
1686
1687extern struct mm_struct init_mm;
1688
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001689extern struct pid_namespace init_pid_ns;
1690
1691/*
1692 * find a task by one of its numerical ids
1693 *
1694 * find_task_by_pid_type_ns():
1695 * it is the most generic call - it finds a task by all id,
1696 * type and namespace specified
1697 * find_task_by_pid_ns():
1698 * finds a task by its pid in the specified namespace
Pavel Emelyanov228ebcb2007-10-18 23:40:16 -07001699 * find_task_by_vpid():
1700 * finds a task by its virtual pid
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001701 * find_task_by_pid():
1702 * finds a task by its global pid
1703 *
1704 * see also find_pid() etc in include/linux/pid.h
1705 */
1706
1707extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1708 struct pid_namespace *ns);
1709
Pavel Emelyanov5cd20452008-04-30 00:54:24 -07001710static inline struct task_struct *__deprecated find_task_by_pid(pid_t nr)
1711{
1712 return find_task_by_pid_type_ns(PIDTYPE_PID, nr, &init_pid_ns);
1713}
Pavel Emelyanov228ebcb2007-10-18 23:40:16 -07001714extern struct task_struct *find_task_by_vpid(pid_t nr);
1715extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1716 struct pid_namespace *ns);
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001717
Oleg Nesterov8520d7c2008-02-08 04:19:09 -08001718extern void __set_special_pids(struct pid *pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719
1720/* per-UID process charging. */
Cedric Le Goateracce2922007-07-15 23:40:59 -07001721extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722static inline struct user_struct *get_uid(struct user_struct *u)
1723{
1724 atomic_inc(&u->__count);
1725 return u;
1726}
1727extern void free_uid(struct user_struct *);
1728extern void switch_uid(struct user_struct *);
Pavel Emelyanov28f300d2007-09-18 22:46:45 -07001729extern void release_uids(struct user_namespace *ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730
1731#include <asm/current.h>
1732
Atsushi Nemoto3171a032006-09-29 02:00:32 -07001733extern void do_timer(unsigned long ticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734
Harvey Harrisonb3c97522008-02-13 15:03:15 -08001735extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1736extern int wake_up_process(struct task_struct *tsk);
1737extern void wake_up_new_task(struct task_struct *tsk,
1738 unsigned long clone_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739#ifdef CONFIG_SMP
1740 extern void kick_process(struct task_struct *tsk);
1741#else
1742 static inline void kick_process(struct task_struct *tsk) { }
1743#endif
Ingo Molnarad46c2c2007-07-09 18:52:00 +02001744extern void sched_fork(struct task_struct *p, int clone_flags);
1745extern void sched_dead(struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746
1747extern int in_group_p(gid_t);
1748extern int in_egroup_p(gid_t);
1749
1750extern void proc_caches_init(void);
1751extern void flush_signals(struct task_struct *);
Oleg Nesterov10ab8252007-05-09 02:34:37 -07001752extern void ignore_signals(struct task_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753extern void flush_signal_handlers(struct task_struct *, int force_default);
1754extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1755
1756static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1757{
1758 unsigned long flags;
1759 int ret;
1760
1761 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1762 ret = dequeue_signal(tsk, mask, info);
1763 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1764
1765 return ret;
1766}
1767
1768extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1769 sigset_t *mask);
1770extern void unblock_all_signals(void);
1771extern void release_task(struct task_struct * p);
1772extern int send_sig_info(int, struct siginfo *, struct task_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773extern int force_sigsegv(int, struct task_struct *);
1774extern int force_sig_info(int, struct siginfo *, struct task_struct *);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001775extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001776extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
Eric W. Biederman2425c082006-10-02 02:17:28 -07001777extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001778extern int kill_pgrp(struct pid *pid, int sig, int priv);
1779extern int kill_pid(struct pid *pid, int sig, int priv);
Matthew Wilcoxc3de4b32007-02-09 08:11:47 -07001780extern int kill_proc_info(int, struct siginfo *, pid_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781extern void do_notify_parent(struct task_struct *, int);
1782extern void force_sig(int, struct task_struct *);
1783extern void force_sig_specific(int, struct task_struct *);
1784extern int send_sig(int, struct task_struct *, int);
1785extern void zap_other_threads(struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786extern int kill_proc(pid_t, int, int);
1787extern struct sigqueue *sigqueue_alloc(void);
1788extern void sigqueue_free(struct sigqueue *);
Oleg Nesterovac5c2152008-04-30 00:52:57 -07001789extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
Oleg Nesterov9ac95f22006-02-09 22:41:50 +03001790extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1792
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001793static inline int kill_cad_pid(int sig, int priv)
1794{
1795 return kill_pid(cad_pid, sig, priv);
1796}
1797
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798/* These can be the second arg to send_sig_info/send_group_sig_info. */
1799#define SEND_SIG_NOINFO ((struct siginfo *) 0)
1800#define SEND_SIG_PRIV ((struct siginfo *) 1)
1801#define SEND_SIG_FORCED ((struct siginfo *) 2)
1802
Oleg Nesterov621d3122005-10-30 15:03:45 -08001803static inline int is_si_special(const struct siginfo *info)
1804{
1805 return info <= SEND_SIG_FORCED;
1806}
1807
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808/* True if we are on the alternate signal stack. */
1809
1810static inline int on_sig_stack(unsigned long sp)
1811{
1812 return (sp - current->sas_ss_sp < current->sas_ss_size);
1813}
1814
1815static inline int sas_ss_flags(unsigned long sp)
1816{
1817 return (current->sas_ss_size == 0 ? SS_DISABLE
1818 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1819}
1820
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821/*
1822 * Routines for handling mm_structs
1823 */
1824extern struct mm_struct * mm_alloc(void);
1825
1826/* mmdrop drops the mm and the page tables */
Harvey Harrisonb3c97522008-02-13 15:03:15 -08001827extern void __mmdrop(struct mm_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828static inline void mmdrop(struct mm_struct * mm)
1829{
Ingo Molnar6fb43d72007-07-09 18:52:01 +02001830 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 __mmdrop(mm);
1832}
1833
1834/* mmput gets rid of the mappings and all user-space */
1835extern void mmput(struct mm_struct *);
1836/* Grab a reference to a task's mm, if it is not already going away */
1837extern struct mm_struct *get_task_mm(struct task_struct *task);
1838/* Remove the current tasks stale references to the old mm_struct */
1839extern void mm_release(struct task_struct *, struct mm_struct *);
Carsten Otte402b0862008-03-25 18:47:10 +01001840/* Allocate a new mm structure and copy contents from tsk->mm */
1841extern struct mm_struct *dup_mm(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842
1843extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1844extern void flush_thread(void);
1845extern void exit_thread(void);
1846
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847extern void exit_files(struct task_struct *);
Oleg Nesterov6b3934e2006-03-28 16:11:16 -08001848extern void __cleanup_signal(struct signal_struct *);
Oleg Nesterova7e53282006-03-28 16:11:27 -08001849extern void __cleanup_sighand(struct sighand_struct *);
Oleg Nesterovcbaffba2008-05-26 20:55:42 +04001850
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851extern void exit_itimers(struct signal_struct *);
Oleg Nesterovcbaffba2008-05-26 20:55:42 +04001852extern void flush_itimer_signals(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853
1854extern NORET_TYPE void do_group_exit(int);
1855
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856extern void daemonize(const char *, ...);
1857extern int allow_signal(int);
1858extern int disallow_signal(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859
1860extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1861extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
Ingo Molnar36c8b582006-07-03 00:25:41 -07001862struct task_struct *fork_idle(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863
1864extern void set_task_comm(struct task_struct *tsk, char *from);
Andrew Morton59714d62008-02-04 22:27:21 -08001865extern char *get_task_comm(char *to, struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866
1867#ifdef CONFIG_SMP
Ingo Molnar36c8b582006-07-03 00:25:41 -07001868extern void wait_task_inactive(struct task_struct * p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869#else
1870#define wait_task_inactive(p) do { } while (0)
1871#endif
1872
1873#define remove_parent(p) list_del_init(&(p)->sibling)
Oleg Nesterov8fafabd2006-03-28 16:11:05 -08001874#define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875
Eric W. Biederman5e85d4a2006-04-18 22:20:16 -07001876#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877
1878#define for_each_process(p) \
1879 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1880
1881/*
1882 * Careful: do_each_thread/while_each_thread is a double loop so
1883 * 'break' will not work as expected - use goto instead.
1884 */
1885#define do_each_thread(g, t) \
1886 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1887
1888#define while_each_thread(g, t) \
1889 while ((t = next_thread(t)) != g)
1890
Eric W. Biedermande12a782006-04-10 17:16:49 -06001891/* de_thread depends on thread_group_leader not being a pid based check */
1892#define thread_group_leader(p) (p == p->group_leader)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893
Eric W. Biederman0804ef42006-10-02 02:17:04 -07001894/* Do to the insanities of de_thread it is possible for a process
1895 * to have the pid of the thread group leader without actually being
1896 * the thread group leader. For iteration through the pids in proc
1897 * all we care about is that we have a task with the appropriate
1898 * pid, we don't actually care if we have the right task.
1899 */
Alexey Dobriyane8681712007-10-26 12:17:22 +04001900static inline int has_group_leader_pid(struct task_struct *p)
Eric W. Biederman0804ef42006-10-02 02:17:04 -07001901{
1902 return p->pid == p->tgid;
1903}
1904
Pavel Emelyanovbac0abd2007-10-18 23:40:18 -07001905static inline
1906int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1907{
1908 return p1->tgid == p2->tgid;
1909}
1910
Ingo Molnar36c8b582006-07-03 00:25:41 -07001911static inline struct task_struct *next_thread(const struct task_struct *p)
Oleg Nesterov47e65322006-03-28 16:11:25 -08001912{
1913 return list_entry(rcu_dereference(p->thread_group.next),
Ingo Molnar36c8b582006-07-03 00:25:41 -07001914 struct task_struct, thread_group);
Oleg Nesterov47e65322006-03-28 16:11:25 -08001915}
1916
Alexey Dobriyane8681712007-10-26 12:17:22 +04001917static inline int thread_group_empty(struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918{
Oleg Nesterov47e65322006-03-28 16:11:25 -08001919 return list_empty(&p->thread_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920}
1921
1922#define delay_group_leader(p) \
1923 (thread_group_leader(p) && !thread_group_empty(p))
1924
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925/*
Eric W. Biederman260ea102006-06-23 02:05:18 -07001926 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
Jens Axboe22e2c502005-06-27 10:55:12 +02001927 * subscriptions and synchronises with wait4(). Also used in procfs. Also
Paul Menageddbcc7e2007-10-18 23:39:30 -07001928 * pins the final release of task.io_context. Also protects ->cpuset and
1929 * ->cgroup.subsys[].
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930 *
1931 * Nests both inside and outside of read_lock(&tasklist_lock).
1932 * It must not be nested with write_lock_irq(&tasklist_lock),
1933 * neither inside nor outside.
1934 */
1935static inline void task_lock(struct task_struct *p)
1936{
1937 spin_lock(&p->alloc_lock);
1938}
1939
1940static inline void task_unlock(struct task_struct *p)
1941{
1942 spin_unlock(&p->alloc_lock);
1943}
1944
Oleg Nesterovf63ee722006-03-28 16:11:13 -08001945extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1946 unsigned long *flags);
1947
1948static inline void unlock_task_sighand(struct task_struct *tsk,
1949 unsigned long *flags)
1950{
1951 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1952}
1953
Al Virof0373602005-11-13 16:06:57 -08001954#ifndef __HAVE_THREAD_FUNCTIONS
1955
Roman Zippelf7e42172007-05-09 02:35:17 -07001956#define task_thread_info(task) ((struct thread_info *)(task)->stack)
1957#define task_stack_page(task) ((task)->stack)
Al Viroa1261f52005-11-13 16:06:55 -08001958
Al Viro10ebffd2005-11-13 16:06:56 -08001959static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1960{
1961 *task_thread_info(p) = *task_thread_info(org);
1962 task_thread_info(p)->task = p;
1963}
1964
1965static inline unsigned long *end_of_stack(struct task_struct *p)
1966{
Roman Zippelf7e42172007-05-09 02:35:17 -07001967 return (unsigned long *)(task_thread_info(p) + 1);
Al Viro10ebffd2005-11-13 16:06:56 -08001968}
1969
Al Virof0373602005-11-13 16:06:57 -08001970#endif
1971
Benjamin Herrenschmidt8c9843e2008-04-18 16:56:15 +10001972extern void thread_info_cache_init(void);
1973
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974/* set thread flags in other task's structures
1975 * - see asm/thread_info.h for TIF_xxxx flags available
1976 */
1977static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1978{
Al Viroa1261f52005-11-13 16:06:55 -08001979 set_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980}
1981
1982static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1983{
Al Viroa1261f52005-11-13 16:06:55 -08001984 clear_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985}
1986
1987static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1988{
Al Viroa1261f52005-11-13 16:06:55 -08001989 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990}
1991
1992static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1993{
Al Viroa1261f52005-11-13 16:06:55 -08001994 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995}
1996
1997static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1998{
Al Viroa1261f52005-11-13 16:06:55 -08001999 return test_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000}
2001
2002static inline void set_tsk_need_resched(struct task_struct *tsk)
2003{
2004 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2005}
2006
2007static inline void clear_tsk_need_resched(struct task_struct *tsk)
2008{
2009 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2010}
2011
Gregory Haskins8ae121a2008-04-23 07:13:29 -04002012static inline int test_tsk_need_resched(struct task_struct *tsk)
2013{
2014 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2015}
2016
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017static inline int signal_pending(struct task_struct *p)
2018{
2019 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2020}
Matthew Wilcoxf776d122007-12-06 11:15:50 -05002021
Harvey Harrisonb3c97522008-02-13 15:03:15 -08002022extern int __fatal_signal_pending(struct task_struct *p);
Matthew Wilcoxf776d122007-12-06 11:15:50 -05002023
2024static inline int fatal_signal_pending(struct task_struct *p)
2025{
2026 return signal_pending(p) && __fatal_signal_pending(p);
2027}
2028
Oleg Nesterov16882c12008-06-08 21:20:41 +04002029static inline int signal_pending_state(long state, struct task_struct *p)
2030{
2031 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2032 return 0;
2033 if (!signal_pending(p))
2034 return 0;
2035
2036 if (state & (__TASK_STOPPED | __TASK_TRACED))
2037 return 0;
2038
2039 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2040}
2041
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042static inline int need_resched(void)
2043{
Linus Torvalds9404ef02008-05-12 10:14:22 -07002044 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045}
2046
2047/*
2048 * cond_resched() and cond_resched_lock(): latency reduction via
2049 * explicit rescheduling in places that are safe. The return
2050 * value indicates whether a reschedule was done in fact.
2051 * cond_resched_lock() will drop the spinlock before scheduling,
2052 * cond_resched_softirq() will enable bhs before scheduling.
2053 */
Linus Torvaldsc3921ab2008-05-11 16:04:48 -07002054extern int _cond_resched(void);
Linus Torvaldsc714a532008-05-12 13:34:13 -07002055#ifdef CONFIG_PREEMPT_BKL
Herbert Xu02b67cc2008-01-25 21:08:28 +01002056static inline int cond_resched(void)
2057{
2058 return 0;
2059}
2060#else
Herbert Xu02b67cc2008-01-25 21:08:28 +01002061static inline int cond_resched(void)
2062{
2063 return _cond_resched();
2064}
2065#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066extern int cond_resched_lock(spinlock_t * lock);
2067extern int cond_resched_softirq(void);
Linus Torvaldsc3921ab2008-05-11 16:04:48 -07002068static inline int cond_resched_bkl(void)
2069{
2070 return _cond_resched();
2071}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072
2073/*
2074 * Does a critical section need to be broken due to another
Nick Piggin95c354f2008-01-30 13:31:20 +01002075 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2076 * but a general need for low latency)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077 */
Nick Piggin95c354f2008-01-30 13:31:20 +01002078static inline int spin_needbreak(spinlock_t *lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002079{
Nick Piggin95c354f2008-01-30 13:31:20 +01002080#ifdef CONFIG_PREEMPT
2081 return spin_is_contended(lock);
2082#else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083 return 0;
Nick Piggin95c354f2008-01-30 13:31:20 +01002084#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085}
2086
Roland McGrath7bb44ad2007-05-23 13:57:44 -07002087/*
2088 * Reevaluate whether the task has signals pending delivery.
2089 * Wake the task if so.
2090 * This is required every time the blocked sigset_t changes.
2091 * callers must hold sighand->siglock.
2092 */
2093extern void recalc_sigpending_and_wake(struct task_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094extern void recalc_sigpending(void);
2095
2096extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2097
2098/*
2099 * Wrappers for p->thread_info->cpu access. No-op on UP.
2100 */
2101#ifdef CONFIG_SMP
2102
2103static inline unsigned int task_cpu(const struct task_struct *p)
2104{
Al Viroa1261f52005-11-13 16:06:55 -08002105 return task_thread_info(p)->cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106}
2107
Ingo Molnarc65cc872007-07-09 18:51:58 +02002108extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109
2110#else
2111
2112static inline unsigned int task_cpu(const struct task_struct *p)
2113{
2114 return 0;
2115}
2116
2117static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2118{
2119}
2120
2121#endif /* CONFIG_SMP */
2122
2123#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
2124extern void arch_pick_mmap_layout(struct mm_struct *mm);
2125#else
2126static inline void arch_pick_mmap_layout(struct mm_struct *mm)
2127{
2128 mm->mmap_base = TASK_UNMAPPED_BASE;
2129 mm->get_unmapped_area = arch_get_unmapped_area;
2130 mm->unmap_area = arch_unmap_area;
2131}
2132#endif
2133
Mike Travisb53e9212008-04-04 18:11:08 -07002134extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
2136
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -07002137extern int sched_mc_power_savings, sched_smt_power_savings;
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -07002138
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139extern void normalize_rt_tasks(void);
2140
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002141#ifdef CONFIG_GROUP_SCHED
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002142
Ingo Molnar4cf86d72007-10-15 17:00:14 +02002143extern struct task_group init_task_group;
Peter Zijlstraeff766a2008-04-19 19:45:00 +02002144#ifdef CONFIG_USER_SCHED
2145extern struct task_group root_task_group;
2146#endif
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002147
Dhaval Gianiec7dc8a2008-04-19 19:44:59 +02002148extern struct task_group *sched_create_group(struct task_group *parent);
Ingo Molnar4cf86d72007-10-15 17:00:14 +02002149extern void sched_destroy_group(struct task_group *tg);
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002150extern void sched_move_task(struct task_struct *tsk);
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002151#ifdef CONFIG_FAIR_GROUP_SCHED
Ingo Molnar4cf86d72007-10-15 17:00:14 +02002152extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
Dhaval Giani5cb350b2007-10-15 17:00:14 +02002153extern unsigned long sched_group_shares(struct task_group *tg);
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002154#endif
2155#ifdef CONFIG_RT_GROUP_SCHED
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +01002156extern int sched_group_set_rt_runtime(struct task_group *tg,
2157 long rt_runtime_us);
2158extern long sched_group_rt_runtime(struct task_group *tg);
Peter Zijlstrad0b27fa2008-04-19 19:44:57 +02002159extern int sched_group_set_rt_period(struct task_group *tg,
2160 long rt_period_us);
2161extern long sched_group_rt_period(struct task_group *tg);
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002162#endif
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002163#endif
2164
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08002165#ifdef CONFIG_TASK_XACCT
2166static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2167{
2168 tsk->rchar += amt;
2169}
2170
2171static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2172{
2173 tsk->wchar += amt;
2174}
2175
2176static inline void inc_syscr(struct task_struct *tsk)
2177{
2178 tsk->syscr++;
2179}
2180
2181static inline void inc_syscw(struct task_struct *tsk)
2182{
2183 tsk->syscw++;
2184}
2185#else
2186static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2187{
2188}
2189
2190static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2191{
2192}
2193
2194static inline void inc_syscr(struct task_struct *tsk)
2195{
2196}
2197
2198static inline void inc_syscw(struct task_struct *tsk)
2199{
2200}
2201#endif
2202
Adrian Bunke6fe6642007-11-09 22:39:39 +01002203#ifdef CONFIG_SMP
2204void migration_init(void);
2205#else
2206static inline void migration_init(void)
2207{
2208}
2209#endif
2210
Dave Hansen82455252008-02-04 22:28:59 -08002211#ifndef TASK_SIZE_OF
2212#define TASK_SIZE_OF(tsk) TASK_SIZE
2213#endif
2214
Balbir Singhcf475ad2008-04-29 01:00:16 -07002215#ifdef CONFIG_MM_OWNER
2216extern void mm_update_next_owner(struct mm_struct *mm);
2217extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2218#else
2219static inline void mm_update_next_owner(struct mm_struct *mm)
2220{
2221}
2222
2223static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2224{
2225}
2226#endif /* CONFIG_MM_OWNER */
2227
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228#endif /* __KERNEL__ */
2229
2230#endif