blob: 1d02babdb2c71ef3df2b427ab6025737bd661bd3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_SCHED_H
2#define _LINUX_SCHED_H
3
David Woodhouseb7b3c762006-04-27 00:12:56 +01004/*
5 * cloning flags:
6 */
7#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
8#define CLONE_VM 0x00000100 /* set if VM shared between processes */
9#define CLONE_FS 0x00000200 /* set if fs info shared between processes */
10#define CLONE_FILES 0x00000400 /* set if open files shared between processes */
11#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
12#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
13#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
14#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
15#define CLONE_THREAD 0x00010000 /* Same thread group? */
16#define CLONE_NEWNS 0x00020000 /* New namespace group? */
17#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
18#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
19#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
20#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
21#define CLONE_DETACHED 0x00400000 /* Unused, ignored */
22#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
23#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
24#define CLONE_STOPPED 0x02000000 /* Start in stopped state */
Serge E. Hallyn071df102006-10-02 02:18:17 -070025#define CLONE_NEWUTS 0x04000000 /* New utsname group? */
Kirill Korotaev25b21cb2006-10-02 02:18:19 -070026#define CLONE_NEWIPC 0x08000000 /* New ipcs */
Serge E. Hallyn77ec7392007-07-15 23:41:01 -070027#define CLONE_NEWUSER 0x10000000 /* New user namespace */
Pavel Emelyanov30e49c22007-10-18 23:40:10 -070028#define CLONE_NEWPID 0x20000000 /* New pid namespace */
Eric W. Biederman169e3672007-09-27 17:10:06 -070029#define CLONE_NEWNET 0x40000000 /* New network namespace */
Jens Axboefadad8782008-01-24 08:54:47 +010030#define CLONE_IO 0x80000000 /* Clone io context */
David Woodhouseb7b3c762006-04-27 00:12:56 +010031
32/*
33 * Scheduling policies
34 */
35#define SCHED_NORMAL 0
36#define SCHED_FIFO 1
37#define SCHED_RR 2
38#define SCHED_BATCH 3
Ingo Molnar0e6aca42007-07-09 18:51:57 +020039/* SCHED_ISO: reserved but not implemented yet */
40#define SCHED_IDLE 5
David Woodhouseb7b3c762006-04-27 00:12:56 +010041
David Woodhousea3b67142006-04-25 14:54:40 +010042#ifdef __KERNEL__
David Woodhouseb7b3c762006-04-27 00:12:56 +010043
44struct sched_param {
45 int sched_priority;
46};
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <asm/param.h> /* for HZ */
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/capability.h>
51#include <linux/threads.h>
52#include <linux/kernel.h>
53#include <linux/types.h>
54#include <linux/timex.h>
55#include <linux/jiffies.h>
56#include <linux/rbtree.h>
57#include <linux/thread_info.h>
58#include <linux/cpumask.h>
59#include <linux/errno.h>
60#include <linux/nodemask.h>
Martin Schwidefskyc92ff1b2007-10-16 01:24:43 -070061#include <linux/mm_types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63#include <asm/system.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#include <asm/page.h>
65#include <asm/ptrace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#include <asm/cputime.h>
67
68#include <linux/smp.h>
69#include <linux/sem.h>
70#include <linux/signal.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <linux/fs_struct.h>
72#include <linux/compiler.h>
73#include <linux/completion.h>
74#include <linux/pid.h>
75#include <linux/percpu.h>
76#include <linux/topology.h>
Peter Zijlstra3e26c142007-10-16 23:25:50 -070077#include <linux/proportions.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070078#include <linux/seccomp.h>
Ingo Molnare56d0902006-01-08 01:01:37 -080079#include <linux/rcupdate.h>
Ingo Molnar23f78d4a2006-06-27 02:54:53 -070080#include <linux/rtmutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
David Woodhousea3b67142006-04-25 14:54:40 +010082#include <linux/time.h>
83#include <linux/param.h>
84#include <linux/resource.h>
85#include <linux/timer.h>
86#include <linux/hrtimer.h>
Andrew Morton7c3ab732006-12-10 02:19:19 -080087#include <linux/task_io_accounting.h>
Dhaval Giani5cb350b2007-10-15 17:00:14 +020088#include <linux/kobject.h>
Arjan van de Ven97455122008-01-25 21:08:34 +010089#include <linux/latencytop.h>
David Woodhousea3b67142006-04-25 14:54:40 +010090
91#include <asm/processor.h>
H. J. Lu36d57ac2005-09-06 15:16:49 -070092
Pavel Emelianov78fb7462008-02-07 00:13:51 -080093struct mem_cgroup;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094struct exec_domain;
Ingo Molnarc87e2832006-06-27 02:54:58 -070095struct futex_pi_state;
Alexey Dobriyan286100a2008-01-25 21:08:34 +010096struct robust_list_head;
Neil Brownd89d8792007-05-01 09:53:42 +020097struct bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 * List of flags we want to share for kernel threads,
101 * if only because they are not used by them anyway.
102 */
103#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
104
105/*
106 * These are the constant used to fake the fixed-point load-average
107 * counting. Some notes:
108 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
109 * a load-average precision of 10 bits integer + 11 bits fractional
110 * - if you want to count load-averages more often, you need more
111 * precision, or rounding will get you. With 2-second counting freq,
112 * the EXP_n values would be 1981, 2034 and 2043 if still using only
113 * 11 bit fractions.
114 */
115extern unsigned long avenrun[]; /* Load averages */
116
117#define FSHIFT 11 /* nr of bits of precision */
118#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
Linus Torvalds0c2043a2007-10-07 16:17:38 -0700119#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
121#define EXP_5 2014 /* 1/exp(5sec/5min) */
122#define EXP_15 2037 /* 1/exp(5sec/15min) */
123
124#define CALC_LOAD(load,exp,n) \
125 load *= exp; \
126 load += n*(FIXED_1-exp); \
127 load >>= FSHIFT;
128
129extern unsigned long total_forks;
130extern int nr_threads;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131DECLARE_PER_CPU(unsigned long, process_counts);
132extern int nr_processes(void);
133extern unsigned long nr_running(void);
134extern unsigned long nr_uninterruptible(void);
Jack Steinerdb1b1fe2006-03-31 02:31:21 -0800135extern unsigned long nr_active(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136extern unsigned long nr_iowait(void);
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
Linus Torvalds4a8342d2005-09-29 15:18:21 -0700161/*
162 * Task state bitmask. NOTE! These bits are also
163 * encoded in fs/proc/array.c: get_task_state().
164 *
165 * We have two separate sets of flags: task->state
166 * is about runnability, while task->exit_state are
167 * about the task exiting. Confusing, but this way
168 * modifying one set can't modify the other one by
169 * mistake.
170 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171#define TASK_RUNNING 0
172#define TASK_INTERRUPTIBLE 1
173#define TASK_UNINTERRUPTIBLE 2
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500174#define __TASK_STOPPED 4
175#define __TASK_TRACED 8
Linus Torvalds4a8342d2005-09-29 15:18:21 -0700176/* in tsk->exit_state */
177#define EXIT_ZOMBIE 16
178#define EXIT_DEAD 32
179/* in tsk->state again */
Mike Galbraithaf927232007-10-15 17:00:13 +0200180#define TASK_DEAD 64
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500181#define TASK_WAKEKILL 128
182
183/* Convenience macros for the sake of set_task_state */
184#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
185#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
186#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500188/* Convenience macros for the sake of wake_up */
189#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500190#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500191
192/* get_task_state() */
193#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500194 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
195 __TASK_TRACED)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500196
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500197#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
198#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500199#define task_is_stopped_or_traced(task) \
Matthew Wilcoxf021a3c2007-12-06 11:13:16 -0500200 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
Matthew Wilcox92a1f4b2007-12-06 10:55:25 -0500201#define task_contributes_to_load(task) \
202 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204#define __set_task_state(tsk, state_value) \
205 do { (tsk)->state = (state_value); } while (0)
206#define set_task_state(tsk, state_value) \
207 set_mb((tsk)->state, (state_value))
208
Andrew Morton498d0c52005-09-13 01:25:14 -0700209/*
210 * set_current_state() includes a barrier so that the write of current->state
211 * is correctly serialised wrt the caller's subsequent test of whether to
212 * actually sleep:
213 *
214 * set_current_state(TASK_UNINTERRUPTIBLE);
215 * if (do_i_need_to_sleep())
216 * schedule();
217 *
218 * If the caller does not need such serialisation then use __set_current_state()
219 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220#define __set_current_state(state_value) \
221 do { current->state = (state_value); } while (0)
222#define set_current_state(state_value) \
223 set_mb(current->state, (state_value))
224
225/* Task command name length */
226#define TASK_COMM_LEN 16
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228#include <linux/spinlock.h>
229
230/*
231 * This serializes "schedule()" and also protects
232 * the run-queue from deletions/modifications (but
233 * _adding_ to the beginning of the run-queue has
234 * a separate lock).
235 */
236extern rwlock_t tasklist_lock;
237extern spinlock_t mmlist_lock;
238
Ingo Molnar36c8b582006-07-03 00:25:41 -0700239struct task_struct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241extern void sched_init(void);
242extern void sched_init_smp(void);
Harvey Harrison2d07b252008-02-15 09:56:34 -0800243extern asmlinkage void schedule_tail(struct task_struct *prev);
Ingo Molnar36c8b582006-07-03 00:25:41 -0700244extern void init_idle(struct task_struct *idle, int cpu);
Ingo Molnar1df21052007-07-09 18:51:58 +0200245extern void init_idle_bootup_task(struct task_struct *idle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
247extern cpumask_t nohz_cpu_mask;
Siddha, Suresh B46cb4b72007-05-08 00:32:51 -0700248#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
249extern int select_nohz_load_balancer(int cpu);
250#else
251static inline int select_nohz_load_balancer(int cpu)
252{
253 return 0;
254}
255#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Peter Zijlstra48d5e252008-01-25 21:08:31 +0100257extern unsigned long rt_needs_cpu(int cpu);
258
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800259/*
Ingo Molnar39bc89f2007-04-25 20:50:03 -0700260 * Only dump TASK_* tasks. (0 for all tasks)
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800261 */
262extern void show_state_filter(unsigned long state_filter);
263
264static inline void show_state(void)
265{
Ingo Molnar39bc89f2007-04-25 20:50:03 -0700266 show_state_filter(0);
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800267}
268
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269extern void show_regs(struct pt_regs *);
270
271/*
272 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
273 * task), SP is the stack pointer of the first frame that should be shown in the back
274 * trace (or NULL if the entire call-chain of the task should be shown).
275 */
276extern void show_stack(struct task_struct *task, unsigned long *sp);
277
278void io_schedule(void);
279long io_schedule_timeout(long timeout);
280
281extern void cpu_init (void);
282extern void trap_init(void);
Paul Mackerrasfa13a5a2007-11-09 22:39:38 +0100283extern void account_process_tick(struct task_struct *task, int user);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284extern void update_process_times(int user);
285extern void scheduler_tick(void);
Peter Zijlstra8f4d37e2008-01-25 21:08:29 +0100286extern void hrtick_resched(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100288extern void sched_show_task(struct task_struct *p);
289
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700290#ifdef CONFIG_DETECT_SOFTLOCKUP
Ingo Molnar6687a972006-03-24 03:18:41 -0800291extern void softlockup_tick(void);
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700292extern void spawn_softlockup_task(void);
293extern void touch_softlockup_watchdog(void);
Jeremy Fitzhardinge04c91672007-05-08 00:28:05 -0700294extern void touch_all_softlockup_watchdogs(void);
Ingo Molnar90739082008-01-25 21:08:34 +0100295extern unsigned long softlockup_thresh;
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100296extern unsigned long sysctl_hung_task_check_count;
297extern unsigned long sysctl_hung_task_timeout_secs;
Ingo Molnar90739082008-01-25 21:08:34 +0100298extern unsigned long sysctl_hung_task_warnings;
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700299#else
Ingo Molnar6687a972006-03-24 03:18:41 -0800300static inline void softlockup_tick(void)
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700301{
302}
303static inline void spawn_softlockup_task(void)
304{
305}
306static inline void touch_softlockup_watchdog(void)
307{
308}
Jeremy Fitzhardinge04c91672007-05-08 00:28:05 -0700309static inline void touch_all_softlockup_watchdogs(void)
310{
311}
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700312#endif
313
314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315/* Attach to any functions which should be ignored in wchan output. */
316#define __sched __attribute__((__section__(".sched.text")))
Ingo Molnardeaf2222007-11-28 15:52:56 +0100317
318/* Linker adds these: start and end of __sched functions */
319extern char __sched_text_start[], __sched_text_end[];
320
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321/* Is this address in the __sched functions? */
322extern int in_sched_functions(unsigned long addr);
323
324#define MAX_SCHEDULE_TIMEOUT LONG_MAX
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800325extern signed long schedule_timeout(signed long timeout);
Nishanth Aravamudan64ed93a2005-09-10 00:27:21 -0700326extern signed long schedule_timeout_interruptible(signed long timeout);
Matthew Wilcox294d5cc2007-12-06 11:59:46 -0500327extern signed long schedule_timeout_killable(signed long timeout);
Nishanth Aravamudan64ed93a2005-09-10 00:27:21 -0700328extern signed long schedule_timeout_uninterruptible(signed long timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329asmlinkage void schedule(void);
330
Serge E. Hallynab516012006-10-02 02:18:06 -0700331struct nsproxy;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700332struct user_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
334/* Maximum number of active map areas.. This is a random (large) number */
335#define DEFAULT_MAX_MAP_COUNT 65536
336
337extern int sysctl_max_map_count;
338
339#include <linux/aio.h>
340
341extern unsigned long
342arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
343 unsigned long, unsigned long);
344extern unsigned long
345arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
346 unsigned long len, unsigned long pgoff,
347 unsigned long flags);
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700348extern void arch_unmap_area(struct mm_struct *, unsigned long);
349extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700351#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
352/*
353 * The mm counters are not protected by its page_table_lock,
354 * so must be incremented atomically.
355 */
Christoph Lameterd3cb4872006-01-06 00:11:20 -0800356#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
357#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
358#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
359#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
360#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700361
362#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
363/*
364 * The mm counters are protected by its page_table_lock,
365 * so can be incremented directly.
366 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
368#define get_mm_counter(mm, member) ((mm)->_##member)
369#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
370#define inc_mm_counter(mm, member) (mm)->_##member++
371#define dec_mm_counter(mm, member) (mm)->_##member--
Hugh Dickins42946212005-10-29 18:16:05 -0700372
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700373#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
374
375#define get_mm_rss(mm) \
376 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
Hugh Dickins365e9c872005-10-29 18:16:18 -0700377#define update_hiwater_rss(mm) do { \
378 unsigned long _rss = get_mm_rss(mm); \
379 if ((mm)->hiwater_rss < _rss) \
380 (mm)->hiwater_rss = _rss; \
381} while (0)
382#define update_hiwater_vm(mm) do { \
383 if ((mm)->hiwater_vm < (mm)->total_vm) \
384 (mm)->hiwater_vm = (mm)->total_vm; \
385} while (0)
386
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700387extern void set_dumpable(struct mm_struct *mm, int value);
388extern int get_dumpable(struct mm_struct *mm);
389
390/* mm flags */
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700391/* dumpable bits */
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700392#define MMF_DUMPABLE 0 /* core dump is permitted */
393#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700394#define MMF_DUMPABLE_BITS 2
395
396/* coredump filter bits */
397#define MMF_DUMP_ANON_PRIVATE 2
398#define MMF_DUMP_ANON_SHARED 3
399#define MMF_DUMP_MAPPED_PRIVATE 4
400#define MMF_DUMP_MAPPED_SHARED 5
Roland McGrath82df3972007-10-16 23:27:02 -0700401#define MMF_DUMP_ELF_HEADERS 6
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700402#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
Roland McGrath82df3972007-10-16 23:27:02 -0700403#define MMF_DUMP_FILTER_BITS 5
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700404#define MMF_DUMP_FILTER_MASK \
405 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
406#define MMF_DUMP_FILTER_DEFAULT \
407 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700408
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409struct sighand_struct {
410 atomic_t count;
411 struct k_sigaction action[_NSIG];
412 spinlock_t siglock;
Davide Libenzib8fceee2007-09-20 12:40:16 -0700413 wait_queue_head_t signalfd_wqh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414};
415
KaiGai Kohei0e464812006-06-25 05:49:24 -0700416struct pacct_struct {
KaiGai Koheif6ec29a2006-06-25 05:49:25 -0700417 int ac_flag;
418 long ac_exitcode;
KaiGai Kohei0e464812006-06-25 05:49:24 -0700419 unsigned long ac_mem;
KaiGai Kohei77787bf2006-06-25 05:49:26 -0700420 cputime_t ac_utime, ac_stime;
421 unsigned long ac_minflt, ac_majflt;
KaiGai Kohei0e464812006-06-25 05:49:24 -0700422};
423
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424/*
425 * NOTE! "signal_struct" does not have it's own
426 * locking, because a shared signal_struct always
427 * implies a shared sighand_struct, so locking
428 * sighand_struct is always a proper superset of
429 * the locking of signal_struct.
430 */
431struct signal_struct {
432 atomic_t count;
433 atomic_t live;
434
435 wait_queue_head_t wait_chldexit; /* for wait4() */
436
437 /* current thread group signal load-balancing target: */
Ingo Molnar36c8b582006-07-03 00:25:41 -0700438 struct task_struct *curr_target;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440 /* shared signal handling: */
441 struct sigpending shared_pending;
442
443 /* thread group exit support */
444 int group_exit_code;
445 /* overloaded:
446 * - notify group_exit_task when ->count is equal to notify_count
447 * - everyone except group_exit_task is stopped during signal delivery
448 * of fatal signals, group_exit_task processes the signal.
449 */
450 struct task_struct *group_exit_task;
451 int notify_count;
452
453 /* thread group stop support, overloads group_exit_code too */
454 int group_stop_count;
455 unsigned int flags; /* see SIGNAL_* flags below */
456
457 /* POSIX.1b Interval Timers */
458 struct list_head posix_timers;
459
460 /* ITIMER_REAL timer for the process */
Thomas Gleixner2ff678b2006-01-09 20:52:34 -0800461 struct hrtimer real_timer;
Oleg Nesterovfea9d172008-02-08 04:19:19 -0800462 struct pid *leader_pid;
Thomas Gleixner2ff678b2006-01-09 20:52:34 -0800463 ktime_t it_real_incr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
465 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
466 cputime_t it_prof_expires, it_virt_expires;
467 cputime_t it_prof_incr, it_virt_incr;
468
469 /* job control IDs */
Pavel Emelyanov9a2e7052007-10-18 23:40:39 -0700470
471 /*
472 * pgrp and session fields are deprecated.
473 * use the task_session_Xnr and task_pgrp_Xnr routines below
474 */
475
476 union {
477 pid_t pgrp __deprecated;
478 pid_t __pgrp;
479 };
480
Eric W. Biedermanab521dc2007-02-12 00:53:00 -0800481 struct pid *tty_old_pgrp;
Cedric Le Goater1ec320a2006-12-08 02:37:55 -0800482
483 union {
484 pid_t session __deprecated;
485 pid_t __session;
486 };
487
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 /* boolean value for session group leader */
489 int leader;
490
491 struct tty_struct *tty; /* NULL if no tty */
492
493 /*
494 * Cumulative resource counters for dead threads in the group,
495 * and for reaped dead child processes forked by this group.
496 * Live threads maintain their own counters and add to these
497 * in __exit_signal, except for the group leader.
498 */
499 cputime_t utime, stime, cutime, cstime;
Laurent Vivier9ac52312007-10-15 17:00:19 +0200500 cputime_t gtime;
501 cputime_t cgtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
503 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
Eric Dumazet6eaeeab2007-05-10 22:22:37 -0700504 unsigned long inblock, oublock, cinblock, coublock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
506 /*
507 * Cumulative ns of scheduled CPU time for dead threads in the
508 * group, not including a zombie group leader. (This only differs
509 * from jiffies_to_ns(utime + stime) if sched_clock uses something
510 * other than jiffies.)
511 */
Ingo Molnar41b86e92007-07-09 18:51:58 +0200512 unsigned long long sum_sched_runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
514 /*
515 * We don't bother to synchronize most readers of this at all,
516 * because there is no reader checking a limit that actually needs
517 * to get both rlim_cur and rlim_max atomically, and either one
518 * alone is a single word that can safely be read normally.
519 * getrlimit/setrlimit use task_lock(current->group_leader) to
520 * protect this instead of the siglock, because they really
521 * have no need to disable irqs.
522 */
523 struct rlimit rlim[RLIM_NLIMITS];
524
525 struct list_head cpu_timers[3];
526
527 /* keep the process-shared keyrings here so that they do the right
528 * thing in threads created with CLONE_THREAD */
529#ifdef CONFIG_KEYS
530 struct key *session_keyring; /* keyring inherited over fork */
531 struct key *process_keyring; /* keyring private to this process */
532#endif
KaiGai Kohei0e464812006-06-25 05:49:24 -0700533#ifdef CONFIG_BSD_PROCESS_ACCT
534 struct pacct_struct pacct; /* per-process accounting information */
535#endif
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700536#ifdef CONFIG_TASKSTATS
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700537 struct taskstats *stats;
538#endif
Miloslav Trmac522ed772007-07-15 23:40:56 -0700539#ifdef CONFIG_AUDIT
540 unsigned audit_tty;
541 struct tty_audit_buf *tty_audit_buf;
542#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543};
544
Nick Piggin4866cde2005-06-25 14:57:23 -0700545/* Context switch must be unlocked if interrupts are to be enabled */
546#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
547# define __ARCH_WANT_UNLOCKED_CTXSW
548#endif
549
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550/*
551 * Bits in flags field of signal_struct.
552 */
553#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
554#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
555#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
556#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
557
Oleg Nesteroved5d2ca2008-02-04 22:27:24 -0800558/* If true, all threads except ->group_exit_task have pending SIGKILL */
559static inline int signal_group_exit(const struct signal_struct *sig)
560{
561 return (sig->flags & SIGNAL_GROUP_EXIT) ||
562 (sig->group_exit_task != NULL);
563}
564
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565/*
566 * Some day this will be a full-fledged user tracking system..
567 */
568struct user_struct {
569 atomic_t __count; /* reference count */
570 atomic_t processes; /* How many processes does this user have? */
571 atomic_t files; /* How many open files does this user have? */
572 atomic_t sigpending; /* How many pending signals does this user have? */
Amy Griffis2d9048e2006-06-01 13:10:59 -0700573#ifdef CONFIG_INOTIFY_USER
Robert Love0eeca282005-07-12 17:06:03 -0400574 atomic_t inotify_watches; /* How many inotify watches does this user have? */
575 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
576#endif
Alexey Dobriyan970a8642007-10-16 23:30:09 -0700577#ifdef CONFIG_POSIX_MQUEUE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 /* protected by mq_lock */
579 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
Alexey Dobriyan970a8642007-10-16 23:30:09 -0700580#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 unsigned long locked_shm; /* How many pages of mlocked shm ? */
582
583#ifdef CONFIG_KEYS
584 struct key *uid_keyring; /* UID specific keyring */
585 struct key *session_keyring; /* UID's default session keyring */
586#endif
587
588 /* Hash table maintenance information */
Pavel Emelyanov735de222007-09-18 22:46:44 -0700589 struct hlist_node uidhash_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 uid_t uid;
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200591
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100592#ifdef CONFIG_USER_SCHED
Ingo Molnar4cf86d72007-10-15 17:00:14 +0200593 struct task_group *tg;
Dhaval Gianib1a8c172007-10-17 16:55:11 +0200594#ifdef CONFIG_SYSFS
Kay Sieverseb41d942007-11-02 13:47:53 +0100595 struct kobject kobj;
Dhaval Giani5cb350b2007-10-15 17:00:14 +0200596 struct work_struct work;
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200597#endif
Dhaval Gianib1a8c172007-10-17 16:55:11 +0200598#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599};
600
Kay Sieverseb41d942007-11-02 13:47:53 +0100601extern int uids_sysfs_init(void);
Dhaval Giani5cb350b2007-10-15 17:00:14 +0200602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603extern struct user_struct *find_user(uid_t);
604
605extern struct user_struct root_user;
606#define INIT_USER (&root_user)
607
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608struct backing_dev_info;
609struct reclaim_state;
610
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700611#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612struct sched_info {
613 /* cumulative counters */
Ingo Molnar2d723762007-10-15 17:00:12 +0200614 unsigned long pcount; /* # of times run on this cpu */
Balbir Singh172ba842007-07-09 18:52:00 +0200615 unsigned long long cpu_time, /* time spent on the cpu */
616 run_delay; /* time spent waiting on a runqueue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
618 /* timestamps */
Balbir Singh172ba842007-07-09 18:52:00 +0200619 unsigned long long last_arrival,/* when we last ran on a cpu */
620 last_queued; /* when we were last queued to run */
Ingo Molnarb8efb562007-10-15 17:00:10 +0200621#ifdef CONFIG_SCHEDSTATS
622 /* BKL stats */
Ken Chen480b9432007-10-18 21:32:56 +0200623 unsigned int bkl_count;
Ingo Molnarb8efb562007-10-15 17:00:10 +0200624#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625};
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700626#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700628#ifdef CONFIG_SCHEDSTATS
Helge Deller15ad7cd2006-12-06 20:40:36 -0800629extern const struct file_operations proc_schedstat_operations;
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700630#endif /* CONFIG_SCHEDSTATS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631
Shailabh Nagarca74e922006-07-14 00:24:36 -0700632#ifdef CONFIG_TASK_DELAY_ACCT
633struct task_delay_info {
634 spinlock_t lock;
635 unsigned int flags; /* Private per-task flags */
636
637 /* For each stat XXX, add following, aligned appropriately
638 *
639 * struct timespec XXX_start, XXX_end;
640 * u64 XXX_delay;
641 * u32 XXX_count;
642 *
643 * Atomicity of updates to XXX_delay, XXX_count protected by
644 * single lock above (split into XXX_lock if contention is an issue).
645 */
Shailabh Nagar0ff92242006-07-14 00:24:37 -0700646
647 /*
648 * XXX_count is incremented on every XXX operation, the delay
649 * associated with the operation is added to XXX_delay.
650 * XXX_delay contains the accumulated delay time in nanoseconds.
651 */
652 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
653 u64 blkio_delay; /* wait for sync block io completion */
654 u64 swapin_delay; /* wait for swapin block io completion */
655 u32 blkio_count; /* total count of the number of sync block */
656 /* io operations performed */
657 u32 swapin_count; /* total count of the number of swapin block */
658 /* io operations performed */
Shailabh Nagarca74e922006-07-14 00:24:36 -0700659};
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700660#endif /* CONFIG_TASK_DELAY_ACCT */
661
662static inline int sched_info_on(void)
663{
664#ifdef CONFIG_SCHEDSTATS
665 return 1;
666#elif defined(CONFIG_TASK_DELAY_ACCT)
667 extern int delayacct_on;
668 return delayacct_on;
669#else
670 return 0;
Shailabh Nagarca74e922006-07-14 00:24:36 -0700671#endif
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700672}
Shailabh Nagarca74e922006-07-14 00:24:36 -0700673
Ingo Molnard15bcfd2007-07-09 18:51:57 +0200674enum cpu_idle_type {
675 CPU_IDLE,
676 CPU_NOT_IDLE,
677 CPU_NEWLY_IDLE,
678 CPU_MAX_IDLE_TYPES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679};
680
681/*
682 * sched-domains (multiprocessor balancing) declarations:
683 */
Ingo Molnar9aa7b362007-07-09 18:51:58 +0200684
685/*
686 * Increase resolution of nice-level calculations:
687 */
688#define SCHED_LOAD_SHIFT 10
689#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
690
Suresh Siddhaf8700df2007-08-23 15:18:02 +0200691#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Peter Williams2dd73a42006-06-27 02:54:34 -0700693#ifdef CONFIG_SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
695#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
696#define SD_BALANCE_EXEC 4 /* Balance on exec */
Nick Piggin147cbb42005-06-25 14:57:19 -0700697#define SD_BALANCE_FORK 8 /* Balance on fork, clone */
698#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
699#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
700#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
701#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700702#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700703#define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
Christoph Lameter08c183f2006-12-10 02:20:29 -0800704#define SD_SERIALIZE 1024 /* Only a single load balancing instance */
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900705#define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700706
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700707#define BALANCE_FOR_MC_POWER \
708 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
709
710#define BALANCE_FOR_PKG_POWER \
711 ((sched_mc_power_savings || sched_smt_power_savings) ? \
712 SD_POWERSAVINGS_BALANCE : 0)
713
714#define test_sd_parent(sd, flag) ((sd->parent && \
715 (sd->parent->flags & flag)) ? 1 : 0)
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700716
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
718struct sched_group {
719 struct sched_group *next; /* Must be a circular list */
720 cpumask_t cpumask;
721
722 /*
723 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
724 * single CPU. This is read only (except for setup, hotplug CPU).
Eric Dumazet5517d862007-05-08 00:32:57 -0700725 * Note : Never change cpu_power without recompute its reciprocal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 */
Eric Dumazet5517d862007-05-08 00:32:57 -0700727 unsigned int __cpu_power;
728 /*
729 * reciprocal value of cpu_power to avoid expensive divides
730 * (see include/linux/reciprocal_div.h)
731 */
732 u32 reciprocal_cpu_power;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733};
734
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900735enum sched_domain_level {
736 SD_LV_NONE = 0,
737 SD_LV_SIBLING,
738 SD_LV_MC,
739 SD_LV_CPU,
740 SD_LV_NODE,
741 SD_LV_ALLNODES,
742 SD_LV_MAX
743};
744
745struct sched_domain_attr {
746 int relax_domain_level;
747};
748
749#define SD_ATTR_INIT (struct sched_domain_attr) { \
750 .relax_domain_level = -1, \
751}
752
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753struct sched_domain {
754 /* These fields must be setup */
755 struct sched_domain *parent; /* top domain must be null terminated */
Siddha, Suresh B1a848872006-10-03 01:14:08 -0700756 struct sched_domain *child; /* bottom domain must be null terminated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 struct sched_group *groups; /* the balancing groups of the domain */
758 cpumask_t span; /* span of all CPUs in this domain */
Peter Zijlstra18d95a22008-04-19 19:45:00 +0200759 int first_cpu; /* cache of the first cpu in this domain */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 unsigned long min_interval; /* Minimum balance interval ms */
761 unsigned long max_interval; /* Maximum balance interval ms */
762 unsigned int busy_factor; /* less balancing by factor if busy */
763 unsigned int imbalance_pct; /* No balance until over watermark */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
Nick Piggin78979862005-06-25 14:57:13 -0700765 unsigned int busy_idx;
766 unsigned int idle_idx;
767 unsigned int newidle_idx;
768 unsigned int wake_idx;
Nick Piggin147cbb42005-06-25 14:57:19 -0700769 unsigned int forkexec_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 int flags; /* See SD_* */
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900771 enum sched_domain_level level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
773 /* Runtime fields. */
774 unsigned long last_balance; /* init to jiffies. units in jiffies */
775 unsigned int balance_interval; /* initialise to 1. units in ms. */
776 unsigned int nr_balance_failed; /* initialise to 0 */
777
778#ifdef CONFIG_SCHEDSTATS
779 /* load_balance() stats */
Ken Chen480b9432007-10-18 21:32:56 +0200780 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
781 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
782 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
783 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
784 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
785 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
786 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
787 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
789 /* Active load balancing */
Ken Chen480b9432007-10-18 21:32:56 +0200790 unsigned int alb_count;
791 unsigned int alb_failed;
792 unsigned int alb_pushed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
Nick Piggin68767a02005-06-25 14:57:20 -0700794 /* SD_BALANCE_EXEC stats */
Ken Chen480b9432007-10-18 21:32:56 +0200795 unsigned int sbe_count;
796 unsigned int sbe_balanced;
797 unsigned int sbe_pushed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
Nick Piggin68767a02005-06-25 14:57:20 -0700799 /* SD_BALANCE_FORK stats */
Ken Chen480b9432007-10-18 21:32:56 +0200800 unsigned int sbf_count;
801 unsigned int sbf_balanced;
802 unsigned int sbf_pushed;
Nick Piggin68767a02005-06-25 14:57:20 -0700803
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 /* try_to_wake_up() stats */
Ken Chen480b9432007-10-18 21:32:56 +0200805 unsigned int ttwu_wake_remote;
806 unsigned int ttwu_move_affine;
807 unsigned int ttwu_move_balance;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808#endif
809};
810
Hidetoshi Seto1d3504f2008-04-15 14:04:23 +0900811extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
812 struct sched_domain_attr *dattr_new);
Heiko Carstens9aefd0a2008-03-12 18:31:58 +0100813extern int arch_reinit_sched_domains(void);
Paul Jackson029190c2007-10-18 23:40:20 -0700814
akpm@osdl.org198e2f12006-01-12 01:05:30 -0800815#endif /* CONFIG_SMP */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
Con Kolivasd02c7a82007-07-26 13:40:43 +0200817/*
818 * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
819 * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
820 * task of nice 0 or enough lower priority tasks to bring up the
821 * weighted_cpuload
822 */
823static inline int above_background_load(void)
824{
825 unsigned long cpu;
826
827 for_each_online_cpu(cpu) {
828 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
829 return 1;
830 }
831 return 0;
832}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833
834struct io_context; /* See blkdev.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835#define NGROUPS_SMALL 32
Eric Dumazet1bf47342008-02-06 01:37:56 -0800836#define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837struct group_info {
838 int ngroups;
839 atomic_t usage;
840 gid_t small_block[NGROUPS_SMALL];
841 int nblocks;
842 gid_t *blocks[0];
843};
844
845/*
846 * get_group_info() must be called with the owning task locked (via task_lock())
847 * when task != current. The reason being that the vast majority of callers are
848 * looking at current->group_info, which can not be changed except by the
849 * current task. Changing current->group_info requires the task lock, too.
850 */
851#define get_group_info(group_info) do { \
852 atomic_inc(&(group_info)->usage); \
853} while (0)
854
855#define put_group_info(group_info) do { \
856 if (atomic_dec_and_test(&(group_info)->usage)) \
857 groups_free(group_info); \
858} while (0)
859
David Howells3e301482005-06-23 22:00:56 -0700860extern struct group_info *groups_alloc(int gidsetsize);
861extern void groups_free(struct group_info *group_info);
862extern int set_current_groups(struct group_info *group_info);
863extern int groups_search(struct group_info *group_info, gid_t grp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864/* access the groups "array" with this macro */
865#define GROUP_AT(gi, i) \
866 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
867
Chen, Kenneth W383f2832005-09-09 13:02:02 -0700868#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
Ingo Molnar36c8b582006-07-03 00:25:41 -0700869extern void prefetch_stack(struct task_struct *t);
Chen, Kenneth W383f2832005-09-09 13:02:02 -0700870#else
871static inline void prefetch_stack(struct task_struct *t) { }
872#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
874struct audit_context; /* See audit.c */
875struct mempolicy;
Jens Axboeb92ce552006-04-11 13:52:07 +0200876struct pipe_inode_info;
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -0700877struct uts_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878
Ingo Molnar20b8a592007-07-09 18:51:58 +0200879struct rq;
880struct sched_domain;
881
882struct sched_class {
Ingo Molnar5522d5d2007-10-15 17:00:12 +0200883 const struct sched_class *next;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200884
Ingo Molnarfd390f62007-08-09 11:16:48 +0200885 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
Ingo Molnarf02231e2007-08-09 11:16:48 +0200886 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
Dmitry Adamushko4530d7a2007-10-15 17:00:08 +0200887 void (*yield_task) (struct rq *rq);
Gregory Haskinse7693a32008-01-25 21:08:09 +0100888 int (*select_task_rq)(struct task_struct *p, int sync);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200889
890 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
891
Ingo Molnarfb8d4722007-08-09 11:16:48 +0200892 struct task_struct * (*pick_next_task) (struct rq *rq);
Ingo Molnar31ee5292007-08-09 11:16:49 +0200893 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200894
Peter Williams681f3e62007-10-24 18:23:51 +0200895#ifdef CONFIG_SMP
Peter Williams43010652007-08-09 11:16:46 +0200896 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
Peter Williamse1d14842007-10-24 18:23:51 +0200897 struct rq *busiest, unsigned long max_load_move,
Ingo Molnar20b8a592007-07-09 18:51:58 +0200898 struct sched_domain *sd, enum cpu_idle_type idle,
Peter Williamsa4ac01c2007-08-09 11:16:46 +0200899 int *all_pinned, int *this_best_prio);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200900
Peter Williamse1d14842007-10-24 18:23:51 +0200901 int (*move_one_task) (struct rq *this_rq, int this_cpu,
902 struct rq *busiest, struct sched_domain *sd,
903 enum cpu_idle_type idle);
Steven Rostedt9a897c52008-01-25 21:08:22 +0100904 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
905 void (*post_schedule) (struct rq *this_rq);
906 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
Peter Williams681f3e62007-10-24 18:23:51 +0200907#endif
Peter Williamse1d14842007-10-24 18:23:51 +0200908
Srivatsa Vaddagiri83b699e2007-10-15 17:00:08 +0200909 void (*set_curr_task) (struct rq *rq);
Peter Zijlstra8f4d37e2008-01-25 21:08:29 +0100910 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
Ingo Molnaree0827d2007-08-09 11:16:49 +0200911 void (*task_new) (struct rq *rq, struct task_struct *p);
Mike Traviscd8ba7c2008-03-26 14:23:49 -0700912 void (*set_cpus_allowed)(struct task_struct *p,
913 const cpumask_t *newmask);
Gregory Haskins57d885f2008-01-25 21:08:18 +0100914
915 void (*join_domain)(struct rq *rq);
916 void (*leave_domain)(struct rq *rq);
Steven Rostedtcb469842008-01-25 21:08:22 +0100917
918 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
919 int running);
920 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
921 int running);
922 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
923 int oldprio, int running);
Peter Zijlstra810b3812008-02-29 15:21:01 -0500924
925#ifdef CONFIG_FAIR_GROUP_SCHED
926 void (*moved_group) (struct task_struct *p);
927#endif
Ingo Molnar20b8a592007-07-09 18:51:58 +0200928};
929
930struct load_weight {
931 unsigned long weight, inv_weight;
932};
933
934/*
935 * CFS stats for a schedulable entity (task, task-group etc)
936 *
937 * Current field usage histogram:
938 *
939 * 4 se->block_start
940 * 4 se->run_node
941 * 4 se->sleep_start
Ingo Molnar20b8a592007-07-09 18:51:58 +0200942 * 6 se->load.weight
Ingo Molnar20b8a592007-07-09 18:51:58 +0200943 */
944struct sched_entity {
Ingo Molnar20b8a592007-07-09 18:51:58 +0200945 struct load_weight load; /* for load-balancing */
946 struct rb_node run_node;
Peter Zijlstra4a55bd52008-04-19 19:45:00 +0200947 struct list_head group_node;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200948 unsigned int on_rq;
949
Ingo Molnar20b8a592007-07-09 18:51:58 +0200950 u64 exec_start;
Ingo Molnar94c18222007-08-02 17:41:40 +0200951 u64 sum_exec_runtime;
Ingo Molnare9acbff2007-10-15 17:00:04 +0200952 u64 vruntime;
Ingo Molnarf6cf8912007-08-28 12:53:24 +0200953 u64 prev_sum_exec_runtime;
Ingo Molnar94c18222007-08-02 17:41:40 +0200954
Ingo Molnar4ae7d5c2008-03-19 01:42:00 +0100955 u64 last_wakeup;
956 u64 avg_overlap;
957
Ingo Molnar94c18222007-08-02 17:41:40 +0200958#ifdef CONFIG_SCHEDSTATS
959 u64 wait_start;
960 u64 wait_max;
Arjan van de Ven6d082592008-01-25 21:08:35 +0100961 u64 wait_count;
962 u64 wait_sum;
Ingo Molnar94c18222007-08-02 17:41:40 +0200963
964 u64 sleep_start;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200965 u64 sleep_max;
Ingo Molnar94c18222007-08-02 17:41:40 +0200966 s64 sum_sleep_runtime;
967
968 u64 block_start;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200969 u64 block_max;
970 u64 exec_max;
Ingo Molnareba1ed42007-10-15 17:00:02 +0200971 u64 slice_max;
Ingo Molnarcc367732007-10-15 17:00:18 +0200972
973 u64 nr_migrations;
974 u64 nr_migrations_cold;
975 u64 nr_failed_migrations_affine;
976 u64 nr_failed_migrations_running;
977 u64 nr_failed_migrations_hot;
978 u64 nr_forced_migrations;
979 u64 nr_forced2_migrations;
980
981 u64 nr_wakeups;
982 u64 nr_wakeups_sync;
983 u64 nr_wakeups_migrate;
984 u64 nr_wakeups_local;
985 u64 nr_wakeups_remote;
986 u64 nr_wakeups_affine;
987 u64 nr_wakeups_affine_attempts;
988 u64 nr_wakeups_passive;
989 u64 nr_wakeups_idle;
Ingo Molnar94c18222007-08-02 17:41:40 +0200990#endif
991
Ingo Molnar20b8a592007-07-09 18:51:58 +0200992#ifdef CONFIG_FAIR_GROUP_SCHED
993 struct sched_entity *parent;
994 /* rq on which this entity is (to be) queued: */
995 struct cfs_rq *cfs_rq;
996 /* rq "owned" by this entity/group: */
997 struct cfs_rq *my_q;
998#endif
999};
Ingo Molnar70b97a72006-07-03 00:25:42 -07001000
Peter Zijlstrafa717062008-01-25 21:08:27 +01001001struct sched_rt_entity {
1002 struct list_head run_list;
1003 unsigned int time_slice;
Peter Zijlstra78f2c7d2008-01-25 21:08:27 +01001004 unsigned long timeout;
Peter Zijlstra6f505b12008-01-25 21:08:30 +01001005 int nr_cpus_allowed;
1006
Peter Zijlstra58d6c2d2008-04-19 19:45:00 +02001007 struct sched_rt_entity *back;
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01001008#ifdef CONFIG_RT_GROUP_SCHED
Peter Zijlstra6f505b12008-01-25 21:08:30 +01001009 struct sched_rt_entity *parent;
1010 /* rq on which this entity is (to be) queued: */
1011 struct rt_rq *rt_rq;
1012 /* rq "owned" by this entity/group: */
1013 struct rt_rq *my_q;
1014#endif
Peter Zijlstrafa717062008-01-25 21:08:27 +01001015};
1016
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017struct task_struct {
1018 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
Roman Zippelf7e42172007-05-09 02:35:17 -07001019 void *stack;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 atomic_t usage;
William Cohen97dc32c2007-05-08 00:23:41 -07001021 unsigned int flags; /* per process flags, defined below */
1022 unsigned int ptrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -07001024 int lock_depth; /* BKL lock depth */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025
Peter Williams2dd73a42006-06-27 02:54:34 -07001026#ifdef CONFIG_SMP
1027#ifdef __ARCH_WANT_UNLOCKED_CTXSW
Nick Piggin4866cde2005-06-25 14:57:23 -07001028 int oncpu;
1029#endif
Peter Williams2dd73a42006-06-27 02:54:34 -07001030#endif
Ingo Molnar50e645a2007-07-09 18:52:00 +02001031
Ingo Molnarb29739f2006-06-27 02:54:51 -07001032 int prio, static_prio, normal_prio;
Ingo Molnar5522d5d2007-10-15 17:00:12 +02001033 const struct sched_class *sched_class;
Ingo Molnar20b8a592007-07-09 18:51:58 +02001034 struct sched_entity se;
Peter Zijlstrafa717062008-01-25 21:08:27 +01001035 struct sched_rt_entity rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036
Avi Kivitye107be32007-07-26 13:40:43 +02001037#ifdef CONFIG_PREEMPT_NOTIFIERS
1038 /* list of struct preempt_notifier: */
1039 struct hlist_head preempt_notifiers;
1040#endif
1041
Alexey Dobriyan18796aa2007-10-16 23:30:26 -07001042 /*
1043 * fpu_counter contains the number of consecutive context switches
1044 * that the FPU is used. If this is over a threshold, the lazy fpu
1045 * saving becomes unlazy to save the trap. This is an unsigned char
1046 * so that after 256 times the counter wraps and the behavior turns
1047 * lazy again; this to deal with bursty apps that only use FPU for
1048 * a short time
1049 */
1050 unsigned char fpu_counter;
1051 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -07001052#ifdef CONFIG_BLK_DEV_IO_TRACE
Jens Axboe2056a782006-03-23 20:00:26 +01001053 unsigned int btrace_seq;
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -07001054#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055
William Cohen97dc32c2007-05-08 00:23:41 -07001056 unsigned int policy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 cpumask_t cpus_allowed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058
Paul E. McKenneye260be62008-01-25 21:08:24 +01001059#ifdef CONFIG_PREEMPT_RCU
1060 int rcu_read_lock_nesting;
1061 int rcu_flipctr_idx;
1062#endif /* #ifdef CONFIG_PREEMPT_RCU */
1063
Chandra Seetharaman52f17b62006-07-14 00:24:38 -07001064#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 struct sched_info sched_info;
1066#endif
1067
1068 struct list_head tasks;
1069 /*
1070 * ptrace_list/ptrace_children forms the list of my children
1071 * that were stolen by a ptracer.
1072 */
1073 struct list_head ptrace_children;
1074 struct list_head ptrace_list;
1075
1076 struct mm_struct *mm, *active_mm;
1077
1078/* task state */
1079 struct linux_binfmt *binfmt;
William Cohen97dc32c2007-05-08 00:23:41 -07001080 int exit_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 int exit_code, exit_signal;
1082 int pdeath_signal; /* The signal sent when the parent dies */
1083 /* ??? */
William Cohen97dc32c2007-05-08 00:23:41 -07001084 unsigned int personality;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 unsigned did_exec:1;
1086 pid_t pid;
1087 pid_t tgid;
Arjan van de Ven0a4254052006-09-26 10:52:38 +02001088
1089#ifdef CONFIG_CC_STACKPROTECTOR
1090 /* Canary value for the -fstack-protector gcc feature */
1091 unsigned long stack_canary;
1092#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 /*
1094 * pointers to (original) parent process, youngest child, younger sibling,
1095 * older sibling, respectively. (p->father can be replaced with
1096 * p->parent->pid)
1097 */
1098 struct task_struct *real_parent; /* real parent process (when being debugged) */
1099 struct task_struct *parent; /* parent process */
1100 /*
1101 * children/sibling forms the list of my children plus the
1102 * tasks I'm ptracing.
1103 */
1104 struct list_head children; /* list of my children */
1105 struct list_head sibling; /* linkage in my parent's children list */
1106 struct task_struct *group_leader; /* threadgroup leader */
1107
1108 /* PID/PID hash table linkage. */
Eric W. Biederman92476d72006-03-31 02:31:42 -08001109 struct pid_link pids[PIDTYPE_MAX];
Oleg Nesterov47e65322006-03-28 16:11:25 -08001110 struct list_head thread_group;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111
1112 struct completion *vfork_done; /* for vfork() */
1113 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1114 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1115
William Cohen97dc32c2007-05-08 00:23:41 -07001116 unsigned int rt_priority;
Michael Neulingc66f08b2007-10-18 03:06:34 -07001117 cputime_t utime, stime, utimescaled, stimescaled;
Laurent Vivier9ac52312007-10-15 17:00:19 +02001118 cputime_t gtime;
Balbir Singh93018992007-10-30 00:26:32 +01001119 cputime_t prev_utime, prev_stime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 unsigned long nvcsw, nivcsw; /* context switch counts */
Tomas Janousek924b42d2007-07-15 23:39:42 -07001121 struct timespec start_time; /* monotonic time */
1122 struct timespec real_start_time; /* boot based time */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1124 unsigned long min_flt, maj_flt;
1125
1126 cputime_t it_prof_expires, it_virt_expires;
1127 unsigned long long it_sched_expires;
1128 struct list_head cpu_timers[3];
1129
1130/* process credentials */
1131 uid_t uid,euid,suid,fsuid;
1132 gid_t gid,egid,sgid,fsgid;
1133 struct group_info *group_info;
Serge E. Hallyn3b7391d2008-02-04 22:29:45 -08001134 kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset;
Andrew G. Morgan3898b1b2008-04-28 02:13:40 -07001135 unsigned securebits;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 struct user_struct *user;
1137#ifdef CONFIG_KEYS
David Howellsb5f545c2006-01-08 01:02:47 -08001138 struct key *request_key_auth; /* assumed request_key authority */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 struct key *thread_keyring; /* keyring private to this thread */
David Howells3e301482005-06-23 22:00:56 -07001140 unsigned char jit_keyring; /* default keyring to attach requested keys to */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141#endif
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -07001142 char comm[TASK_COMM_LEN]; /* executable name excluding path
1143 - access with [gs]et_task_comm (which lock
1144 it with task_lock())
1145 - initialized normally by flush_old_exec */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146/* file system info */
1147 int link_count, total_link_count;
Alexey Dobriyan3d5b6fc2006-09-29 01:59:40 -07001148#ifdef CONFIG_SYSVIPC
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149/* ipc stuff */
1150 struct sysv_sem sysvsem;
Alexey Dobriyan3d5b6fc2006-09-29 01:59:40 -07001151#endif
Ingo Molnar82a1fcb2008-01-25 21:08:02 +01001152#ifdef CONFIG_DETECT_SOFTLOCKUP
1153/* hung task detection */
1154 unsigned long last_switch_timestamp;
1155 unsigned long last_switch_count;
1156#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157/* CPU-specific state of this task */
1158 struct thread_struct thread;
1159/* filesystem information */
1160 struct fs_struct *fs;
1161/* open file information */
1162 struct files_struct *files;
Serge E. Hallyn1651e142006-10-02 02:18:08 -07001163/* namespaces */
Serge E. Hallynab516012006-10-02 02:18:06 -07001164 struct nsproxy *nsproxy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165/* signal handlers */
1166 struct signal_struct *signal;
1167 struct sighand_struct *sighand;
1168
1169 sigset_t blocked, real_blocked;
David Woodhouse150256d2006-01-18 17:43:57 -08001170 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 struct sigpending pending;
1172
1173 unsigned long sas_ss_sp;
1174 size_t sas_ss_size;
1175 int (*notifier)(void *priv);
1176 void *notifier_data;
1177 sigset_t *notifier_mask;
Alexey Dobriyan57c521c2007-10-16 23:31:35 -07001178#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 void *security;
Alexey Dobriyan57c521c2007-10-16 23:31:35 -07001180#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 struct audit_context *audit_context;
Al Virobfef93a2008-01-10 04:53:18 -05001182#ifdef CONFIG_AUDITSYSCALL
1183 uid_t loginuid;
Eric Paris4746ec52008-01-08 10:06:53 -05001184 unsigned int sessionid;
Al Virobfef93a2008-01-10 04:53:18 -05001185#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 seccomp_t seccomp;
1187
1188/* Thread group tracking */
1189 u32 parent_exec_id;
1190 u32 self_exec_id;
1191/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1192 spinlock_t alloc_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193
Ingo Molnarb29739f2006-06-27 02:54:51 -07001194 /* Protection of the PI data structures: */
1195 spinlock_t pi_lock;
1196
Ingo Molnar23f78d4a2006-06-27 02:54:53 -07001197#ifdef CONFIG_RT_MUTEXES
1198 /* PI waiters blocked on a rt_mutex held by this task */
1199 struct plist_head pi_waiters;
1200 /* Deadlock detection and priority inheritance handling */
1201 struct rt_mutex_waiter *pi_blocked_on;
Ingo Molnar23f78d4a2006-06-27 02:54:53 -07001202#endif
1203
Ingo Molnar408894e2006-01-09 15:59:20 -08001204#ifdef CONFIG_DEBUG_MUTEXES
1205 /* mutex deadlock detection */
1206 struct mutex_waiter *blocked_on;
1207#endif
Ingo Molnarde30a2b2006-07-03 00:24:42 -07001208#ifdef CONFIG_TRACE_IRQFLAGS
1209 unsigned int irq_events;
1210 int hardirqs_enabled;
1211 unsigned long hardirq_enable_ip;
1212 unsigned int hardirq_enable_event;
1213 unsigned long hardirq_disable_ip;
1214 unsigned int hardirq_disable_event;
1215 int softirqs_enabled;
1216 unsigned long softirq_disable_ip;
1217 unsigned int softirq_disable_event;
1218 unsigned long softirq_enable_ip;
1219 unsigned int softirq_enable_event;
1220 int hardirq_context;
1221 int softirq_context;
1222#endif
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001223#ifdef CONFIG_LOCKDEP
Peter Zijlstrabdb94412008-02-25 23:02:48 +01001224# define MAX_LOCK_DEPTH 48UL
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001225 u64 curr_chain_key;
1226 int lockdep_depth;
1227 struct held_lock held_locks[MAX_LOCK_DEPTH];
1228 unsigned int lockdep_recursion;
1229#endif
Ingo Molnar408894e2006-01-09 15:59:20 -08001230
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231/* journalling filesystem info */
1232 void *journal_info;
1233
Neil Brownd89d8792007-05-01 09:53:42 +02001234/* stacked block device info */
1235 struct bio *bio_list, **bio_tail;
1236
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237/* VM state */
1238 struct reclaim_state *reclaim_state;
1239
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 struct backing_dev_info *backing_dev_info;
1241
1242 struct io_context *io_context;
1243
1244 unsigned long ptrace_message;
1245 siginfo_t *last_siginfo; /* For ptrace use. */
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001246#ifdef CONFIG_TASK_XACCT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247/* i/o counters(bytes read/written, #syscalls */
1248 u64 rchar, wchar, syscr, syscw;
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001249#endif
Andrew Morton7c3ab732006-12-10 02:19:19 -08001250 struct task_io_accounting ioac;
Jay Lan8f0ab512006-09-30 23:28:59 -07001251#if defined(CONFIG_TASK_XACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 u64 acct_rss_mem1; /* accumulated rss usage */
1253 u64 acct_vm_mem1; /* accumulated virtual memory usage */
Jay Landb5fed262006-09-30 23:29:00 -07001254 cputime_t acct_stimexpd;/* stime since last update */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255#endif
1256#ifdef CONFIG_NUMA
1257 struct mempolicy *mempolicy;
1258 short il_next;
1259#endif
1260#ifdef CONFIG_CPUSETS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 nodemask_t mems_allowed;
1262 int cpuset_mems_generation;
Paul Jackson825a46a2006-03-24 03:16:03 -08001263 int cpuset_mem_spread_rotor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264#endif
Paul Menageddbcc7e2007-10-18 23:39:30 -07001265#ifdef CONFIG_CGROUPS
Paul Menage817929e2007-10-18 23:39:36 -07001266 /* Control Group info protected by css_set_lock */
1267 struct css_set *cgroups;
1268 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1269 struct list_head cg_list;
Paul Menageddbcc7e2007-10-18 23:39:30 -07001270#endif
Alexey Dobriyan42b2dd02007-10-16 23:27:30 -07001271#ifdef CONFIG_FUTEX
Ingo Molnar0771dfe2006-03-27 01:16:22 -08001272 struct robust_list_head __user *robust_list;
Ingo Molnar34f192c2006-03-27 01:16:24 -08001273#ifdef CONFIG_COMPAT
1274 struct compat_robust_list_head __user *compat_robust_list;
1275#endif
Ingo Molnarc87e2832006-06-27 02:54:58 -07001276 struct list_head pi_state_list;
1277 struct futex_pi_state *pi_state_cache;
Alexey Dobriyan42b2dd02007-10-16 23:27:30 -07001278#endif
Jens Axboe22e2c502005-06-27 10:55:12 +02001279 atomic_t fs_excl; /* holding fs exclusive resources */
Ingo Molnare56d0902006-01-08 01:01:37 -08001280 struct rcu_head rcu;
Jens Axboeb92ce552006-04-11 13:52:07 +02001281
1282 /*
1283 * cache last used pipe for splice
1284 */
1285 struct pipe_inode_info *splice_pipe;
Shailabh Nagarca74e922006-07-14 00:24:36 -07001286#ifdef CONFIG_TASK_DELAY_ACCT
1287 struct task_delay_info *delays;
1288#endif
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001289#ifdef CONFIG_FAULT_INJECTION
1290 int make_it_fail;
1291#endif
Peter Zijlstra3e26c142007-10-16 23:25:50 -07001292 struct prop_local_single dirties;
Arjan van de Ven97455122008-01-25 21:08:34 +01001293#ifdef CONFIG_LATENCYTOP
1294 int latency_record_count;
1295 struct latency_record latency_record[LT_SAVECOUNT];
1296#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297};
1298
Ingo Molnare05606d2007-07-09 18:51:59 +02001299/*
1300 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1301 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1302 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1303 * values are inverted: lower p->prio value means higher priority.
1304 *
1305 * The MAX_USER_RT_PRIO value allows the actual maximum
1306 * RT priority to be separate from the value exported to
1307 * user-space. This allows kernel threads to set their
1308 * priority to a value higher than any user task. Note:
1309 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1310 */
1311
1312#define MAX_USER_RT_PRIO 100
1313#define MAX_RT_PRIO MAX_USER_RT_PRIO
1314
1315#define MAX_PRIO (MAX_RT_PRIO + 40)
1316#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1317
1318static inline int rt_prio(int prio)
1319{
1320 if (unlikely(prio < MAX_RT_PRIO))
1321 return 1;
1322 return 0;
1323}
1324
Alexey Dobriyane8681712007-10-26 12:17:22 +04001325static inline int rt_task(struct task_struct *p)
Ingo Molnare05606d2007-07-09 18:51:59 +02001326{
1327 return rt_prio(p->prio);
1328}
1329
Pavel Emelianova47afb02007-10-18 23:39:46 -07001330static inline void set_task_session(struct task_struct *tsk, pid_t session)
Cedric Le Goater937949d2006-12-08 02:37:54 -08001331{
Pavel Emelianova47afb02007-10-18 23:39:46 -07001332 tsk->signal->__session = session;
Cedric Le Goater937949d2006-12-08 02:37:54 -08001333}
1334
Pavel Emelyanov9a2e7052007-10-18 23:40:39 -07001335static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1336{
1337 tsk->signal->__pgrp = pgrp;
1338}
1339
Alexey Dobriyane8681712007-10-26 12:17:22 +04001340static inline struct pid *task_pid(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001341{
1342 return task->pids[PIDTYPE_PID].pid;
1343}
1344
Alexey Dobriyane8681712007-10-26 12:17:22 +04001345static inline struct pid *task_tgid(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001346{
1347 return task->group_leader->pids[PIDTYPE_PID].pid;
1348}
1349
Alexey Dobriyane8681712007-10-26 12:17:22 +04001350static inline struct pid *task_pgrp(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001351{
1352 return task->group_leader->pids[PIDTYPE_PGID].pid;
1353}
1354
Alexey Dobriyane8681712007-10-26 12:17:22 +04001355static inline struct pid *task_session(struct task_struct *task)
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001356{
1357 return task->group_leader->pids[PIDTYPE_SID].pid;
1358}
1359
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001360struct pid_namespace;
1361
1362/*
1363 * the helpers to get the task's different pids as they are seen
1364 * from various namespaces
1365 *
1366 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
Eric W. Biederman44c4e1b2008-02-08 04:19:15 -08001367 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1368 * current.
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001369 * task_xid_nr_ns() : id seen from the ns specified;
1370 *
1371 * set_task_vxid() : assigns a virtual id to a task;
1372 *
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001373 * see also pid_nr() etc in include/linux/pid.h
1374 */
1375
Alexey Dobriyane8681712007-10-26 12:17:22 +04001376static inline pid_t task_pid_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001377{
1378 return tsk->pid;
1379}
1380
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001381pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001382
1383static inline pid_t task_pid_vnr(struct task_struct *tsk)
1384{
1385 return pid_vnr(task_pid(tsk));
1386}
1387
1388
Alexey Dobriyane8681712007-10-26 12:17:22 +04001389static inline pid_t task_tgid_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001390{
1391 return tsk->tgid;
1392}
1393
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001394pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001395
1396static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1397{
1398 return pid_vnr(task_tgid(tsk));
1399}
1400
1401
Alexey Dobriyane8681712007-10-26 12:17:22 +04001402static inline pid_t task_pgrp_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001403{
Pavel Emelyanov9a2e7052007-10-18 23:40:39 -07001404 return tsk->signal->__pgrp;
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001405}
1406
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001407pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001408
1409static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1410{
1411 return pid_vnr(task_pgrp(tsk));
1412}
1413
1414
Alexey Dobriyane8681712007-10-26 12:17:22 +04001415static inline pid_t task_session_nr(struct task_struct *tsk)
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001416{
1417 return tsk->signal->__session;
1418}
1419
Pavel Emelyanov2f2a3a42007-10-18 23:40:19 -07001420pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
Pavel Emelyanov7af57292007-10-18 23:40:06 -07001421
1422static inline pid_t task_session_vnr(struct task_struct *tsk)
1423{
1424 return pid_vnr(task_session(tsk));
1425}
1426
1427
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428/**
1429 * pid_alive - check that a task structure is not stale
1430 * @p: Task structure to be checked.
1431 *
1432 * Test if a process is not yet dead (at most zombie state)
1433 * If pid_alive fails, then pointers within the task structure
1434 * can be stale and must not be dereferenced.
1435 */
Alexey Dobriyane8681712007-10-26 12:17:22 +04001436static inline int pid_alive(struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437{
Eric W. Biederman92476d72006-03-31 02:31:42 -08001438 return p->pids[PIDTYPE_PID].pid != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439}
1440
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001441/**
Serge E. Hallynb460cbc2007-10-18 23:39:52 -07001442 * is_global_init - check if a task structure is init
Henne32602592006-10-06 00:44:01 -07001443 * @tsk: Task structure to be checked.
1444 *
1445 * Check if a task structure is the first user space task the kernel created.
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001446 */
Alexey Dobriyane8681712007-10-26 12:17:22 +04001447static inline int is_global_init(struct task_struct *tsk)
Pavel Emelyanovb461cc02007-10-18 23:40:09 -07001448{
1449 return tsk->pid == 1;
1450}
Serge E. Hallynb460cbc2007-10-18 23:39:52 -07001451
1452/*
1453 * is_container_init:
1454 * check whether in the task is init in its own pid namespace.
1455 */
Pavel Emelyanovb461cc02007-10-18 23:40:09 -07001456extern int is_container_init(struct task_struct *tsk);
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001457
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001458extern struct pid *cad_pid;
1459
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460extern void free_task(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
Ingo Molnare56d0902006-01-08 01:01:37 -08001462
Andrew Morton158d9eb2006-03-31 02:31:34 -08001463extern void __put_task_struct(struct task_struct *t);
Ingo Molnare56d0902006-01-08 01:01:37 -08001464
1465static inline void put_task_struct(struct task_struct *t)
1466{
1467 if (atomic_dec_and_test(&t->usage))
Eric W. Biederman8c7904a2006-03-31 02:31:37 -08001468 __put_task_struct(t);
Ingo Molnare56d0902006-01-08 01:01:37 -08001469}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470
1471/*
1472 * Per process flags
1473 */
1474#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1475 /* Not implemented yet, only for 486*/
1476#define PF_STARTING 0x00000002 /* being created */
1477#define PF_EXITING 0x00000004 /* getting shut down */
Alexey Kuznetsov778e9a92007-06-08 13:47:00 -07001478#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
Laurent Vivier94886b82007-10-15 17:00:19 +02001479#define PF_VCPU 0x00000010 /* I'm a virtual CPU */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1481#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1482#define PF_DUMPCORE 0x00000200 /* dumped core */
1483#define PF_SIGNALED 0x00000400 /* killed by a signal */
1484#define PF_MEMALLOC 0x00000800 /* Allocating memory */
1485#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1486#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1488#define PF_FROZEN 0x00010000 /* frozen for system suspend */
1489#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1490#define PF_KSWAPD 0x00040000 /* I am kswapd */
1491#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1492#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
Jens Axboeb31dc662006-06-13 08:26:10 +02001493#define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1494#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1495#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1496#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1497#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
Paul Jacksonc61afb12006-03-24 03:16:08 -08001498#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
Thomas Gleixner61a87122006-06-27 02:54:56 -07001499#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
Rafael J. Wysockiba96a0c2007-05-23 13:57:25 -07001500#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501
1502/*
1503 * Only the _current_ task can read/write to tsk->flags, but other
1504 * tasks can access tsk->flags in readonly mode for example
1505 * with tsk_used_math (like during threaded core dumping).
1506 * There is however an exception to this rule during ptrace
1507 * or during fork: the ptracer task is allowed to write to the
1508 * child->flags of its traced child (same goes for fork, the parent
1509 * can write to the child->flags), because we're guaranteed the
1510 * child is not running and in turn not changing child->flags
1511 * at the same time the parent does it.
1512 */
1513#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1514#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1515#define clear_used_math() clear_stopped_child_used_math(current)
1516#define set_used_math() set_stopped_child_used_math(current)
1517#define conditional_stopped_child_used_math(condition, child) \
1518 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1519#define conditional_used_math(condition) \
1520 conditional_stopped_child_used_math(condition, current)
1521#define copy_to_stopped_child_used_math(child) \
1522 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1523/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1524#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1525#define used_math() tsk_used_math(current)
1526
1527#ifdef CONFIG_SMP
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001528extern int set_cpus_allowed_ptr(struct task_struct *p,
1529 const cpumask_t *new_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530#else
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001531static inline int set_cpus_allowed_ptr(struct task_struct *p,
1532 const cpumask_t *new_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533{
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001534 if (!cpu_isset(0, *new_mask))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 return -EINVAL;
1536 return 0;
1537}
1538#endif
Mike Traviscd8ba7c2008-03-26 14:23:49 -07001539static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1540{
1541 return set_cpus_allowed_ptr(p, &new_mask);
1542}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543
1544extern unsigned long long sched_clock(void);
Ingo Molnare436d802007-07-19 21:28:35 +02001545
1546/*
1547 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1548 * clock constructed from sched_clock():
1549 */
1550extern unsigned long long cpu_clock(int cpu);
1551
Ingo Molnar36c8b582006-07-03 00:25:41 -07001552extern unsigned long long
Ingo Molnar41b86e92007-07-09 18:51:58 +02001553task_sched_runtime(struct task_struct *task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554
1555/* sched_exec is called by processes performing an exec */
1556#ifdef CONFIG_SMP
1557extern void sched_exec(void);
1558#else
1559#define sched_exec() {}
1560#endif
1561
Ingo Molnar2aa44d02007-08-23 15:18:02 +02001562extern void sched_clock_idle_sleep_event(void);
1563extern void sched_clock_idle_wakeup_event(u64 delta_ns);
Ingo Molnarbb29ab22007-07-09 18:51:59 +02001564
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565#ifdef CONFIG_HOTPLUG_CPU
1566extern void idle_task_exit(void);
1567#else
1568static inline void idle_task_exit(void) {}
1569#endif
1570
1571extern void sched_idle_next(void);
Ingo Molnarb29739f2006-06-27 02:54:51 -07001572
Thomas Gleixner06d83082008-03-22 09:20:24 +01001573#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1574extern void wake_up_idle_cpu(int cpu);
1575#else
1576static inline void wake_up_idle_cpu(int cpu) { }
1577#endif
1578
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001579#ifdef CONFIG_SCHED_DEBUG
Peter Zijlstra21805082007-08-25 18:41:53 +02001580extern unsigned int sysctl_sched_latency;
Peter Zijlstrab2be5e92007-11-09 22:39:37 +01001581extern unsigned int sysctl_sched_min_granularity;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001582extern unsigned int sysctl_sched_wakeup_granularity;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001583extern unsigned int sysctl_sched_child_runs_first;
1584extern unsigned int sysctl_sched_features;
Ingo Molnarda84d962007-10-15 17:00:18 +02001585extern unsigned int sysctl_sched_migration_cost;
Peter Zijlstrab82d9fd2007-11-09 22:39:39 +01001586extern unsigned int sysctl_sched_nr_migrate;
Peter Zijlstrab2be5e92007-11-09 22:39:37 +01001587
1588int sched_nr_latency_handler(struct ctl_table *table, int write,
1589 struct file *file, void __user *buffer, size_t *length,
1590 loff_t *ppos);
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001591#endif
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +01001592extern unsigned int sysctl_sched_rt_period;
1593extern int sysctl_sched_rt_runtime;
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001594
Peter Zijlstrad0b27fa2008-04-19 19:44:57 +02001595int sched_rt_handler(struct ctl_table *table, int write,
1596 struct file *filp, void __user *buffer, size_t *lenp,
1597 loff_t *ppos);
1598
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001599extern unsigned int sysctl_sched_compat_yield;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001600
Ingo Molnarb29739f2006-06-27 02:54:51 -07001601#ifdef CONFIG_RT_MUTEXES
Ingo Molnar36c8b582006-07-03 00:25:41 -07001602extern int rt_mutex_getprio(struct task_struct *p);
1603extern void rt_mutex_setprio(struct task_struct *p, int prio);
1604extern void rt_mutex_adjust_pi(struct task_struct *p);
Ingo Molnarb29739f2006-06-27 02:54:51 -07001605#else
Alexey Dobriyane8681712007-10-26 12:17:22 +04001606static inline int rt_mutex_getprio(struct task_struct *p)
Ingo Molnarb29739f2006-06-27 02:54:51 -07001607{
1608 return p->normal_prio;
1609}
Thomas Gleixner95e02ca2006-06-27 02:55:02 -07001610# define rt_mutex_adjust_pi(p) do { } while (0)
Ingo Molnarb29739f2006-06-27 02:54:51 -07001611#endif
1612
Ingo Molnar36c8b582006-07-03 00:25:41 -07001613extern void set_user_nice(struct task_struct *p, long nice);
1614extern int task_prio(const struct task_struct *p);
1615extern int task_nice(const struct task_struct *p);
1616extern int can_nice(const struct task_struct *p, const int nice);
1617extern int task_curr(const struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618extern int idle_cpu(int cpu);
1619extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
Ingo Molnar36c8b582006-07-03 00:25:41 -07001620extern struct task_struct *idle_task(int cpu);
1621extern struct task_struct *curr_task(int cpu);
1622extern void set_curr_task(int cpu, struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623
1624void yield(void);
1625
1626/*
1627 * The default (Linux) execution domain.
1628 */
1629extern struct exec_domain default_exec_domain;
1630
1631union thread_union {
1632 struct thread_info thread_info;
1633 unsigned long stack[THREAD_SIZE/sizeof(long)];
1634};
1635
1636#ifndef __HAVE_ARCH_KSTACK_END
1637static inline int kstack_end(void *addr)
1638{
1639 /* Reliable end of stack detection:
1640 * Some APM bios versions misalign the stack
1641 */
1642 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1643}
1644#endif
1645
1646extern union thread_union init_thread_union;
1647extern struct task_struct init_task;
1648
1649extern struct mm_struct init_mm;
1650
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001651extern struct pid_namespace init_pid_ns;
1652
1653/*
1654 * find a task by one of its numerical ids
1655 *
1656 * find_task_by_pid_type_ns():
1657 * it is the most generic call - it finds a task by all id,
1658 * type and namespace specified
1659 * find_task_by_pid_ns():
1660 * finds a task by its pid in the specified namespace
Pavel Emelyanov228ebcb2007-10-18 23:40:16 -07001661 * find_task_by_vpid():
1662 * finds a task by its virtual pid
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001663 * find_task_by_pid():
1664 * finds a task by its global pid
1665 *
1666 * see also find_pid() etc in include/linux/pid.h
1667 */
1668
1669extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1670 struct pid_namespace *ns);
1671
Pavel Emelyanov228ebcb2007-10-18 23:40:16 -07001672extern struct task_struct *find_task_by_pid(pid_t nr);
1673extern struct task_struct *find_task_by_vpid(pid_t nr);
1674extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1675 struct pid_namespace *ns);
Pavel Emelyanov198fe212007-10-18 23:40:06 -07001676
Oleg Nesterov8520d7c2008-02-08 04:19:09 -08001677extern void __set_special_pids(struct pid *pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678
1679/* per-UID process charging. */
Cedric Le Goateracce2922007-07-15 23:40:59 -07001680extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681static inline struct user_struct *get_uid(struct user_struct *u)
1682{
1683 atomic_inc(&u->__count);
1684 return u;
1685}
1686extern void free_uid(struct user_struct *);
1687extern void switch_uid(struct user_struct *);
Pavel Emelyanov28f300d2007-09-18 22:46:45 -07001688extern void release_uids(struct user_namespace *ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689
1690#include <asm/current.h>
1691
Atsushi Nemoto3171a032006-09-29 02:00:32 -07001692extern void do_timer(unsigned long ticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693
Harvey Harrisonb3c97522008-02-13 15:03:15 -08001694extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1695extern int wake_up_process(struct task_struct *tsk);
1696extern void wake_up_new_task(struct task_struct *tsk,
1697 unsigned long clone_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698#ifdef CONFIG_SMP
1699 extern void kick_process(struct task_struct *tsk);
1700#else
1701 static inline void kick_process(struct task_struct *tsk) { }
1702#endif
Ingo Molnarad46c2c2007-07-09 18:52:00 +02001703extern void sched_fork(struct task_struct *p, int clone_flags);
1704extern void sched_dead(struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705
1706extern int in_group_p(gid_t);
1707extern int in_egroup_p(gid_t);
1708
1709extern void proc_caches_init(void);
1710extern void flush_signals(struct task_struct *);
Oleg Nesterov10ab8252007-05-09 02:34:37 -07001711extern void ignore_signals(struct task_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712extern void flush_signal_handlers(struct task_struct *, int force_default);
1713extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1714
1715static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1716{
1717 unsigned long flags;
1718 int ret;
1719
1720 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1721 ret = dequeue_signal(tsk, mask, info);
1722 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1723
1724 return ret;
1725}
1726
1727extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1728 sigset_t *mask);
1729extern void unblock_all_signals(void);
1730extern void release_task(struct task_struct * p);
1731extern int send_sig_info(int, struct siginfo *, struct task_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732extern int force_sigsegv(int, struct task_struct *);
1733extern int force_sig_info(int, struct siginfo *, struct task_struct *);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001734extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001735extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
Eric W. Biederman2425c082006-10-02 02:17:28 -07001736extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001737extern int kill_pgrp(struct pid *pid, int sig, int priv);
1738extern int kill_pid(struct pid *pid, int sig, int priv);
Matthew Wilcoxc3de4b32007-02-09 08:11:47 -07001739extern int kill_proc_info(int, struct siginfo *, pid_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740extern void do_notify_parent(struct task_struct *, int);
1741extern void force_sig(int, struct task_struct *);
1742extern void force_sig_specific(int, struct task_struct *);
1743extern int send_sig(int, struct task_struct *, int);
1744extern void zap_other_threads(struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745extern int kill_proc(pid_t, int, int);
1746extern struct sigqueue *sigqueue_alloc(void);
1747extern void sigqueue_free(struct sigqueue *);
1748extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
1749extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
Oleg Nesterov9ac95f22006-02-09 22:41:50 +03001750extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1752
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001753static inline int kill_cad_pid(int sig, int priv)
1754{
1755 return kill_pid(cad_pid, sig, priv);
1756}
1757
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758/* These can be the second arg to send_sig_info/send_group_sig_info. */
1759#define SEND_SIG_NOINFO ((struct siginfo *) 0)
1760#define SEND_SIG_PRIV ((struct siginfo *) 1)
1761#define SEND_SIG_FORCED ((struct siginfo *) 2)
1762
Oleg Nesterov621d3122005-10-30 15:03:45 -08001763static inline int is_si_special(const struct siginfo *info)
1764{
1765 return info <= SEND_SIG_FORCED;
1766}
1767
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768/* True if we are on the alternate signal stack. */
1769
1770static inline int on_sig_stack(unsigned long sp)
1771{
1772 return (sp - current->sas_ss_sp < current->sas_ss_size);
1773}
1774
1775static inline int sas_ss_flags(unsigned long sp)
1776{
1777 return (current->sas_ss_size == 0 ? SS_DISABLE
1778 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1779}
1780
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781/*
1782 * Routines for handling mm_structs
1783 */
1784extern struct mm_struct * mm_alloc(void);
1785
1786/* mmdrop drops the mm and the page tables */
Harvey Harrisonb3c97522008-02-13 15:03:15 -08001787extern void __mmdrop(struct mm_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788static inline void mmdrop(struct mm_struct * mm)
1789{
Ingo Molnar6fb43d72007-07-09 18:52:01 +02001790 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791 __mmdrop(mm);
1792}
1793
1794/* mmput gets rid of the mappings and all user-space */
1795extern void mmput(struct mm_struct *);
1796/* Grab a reference to a task's mm, if it is not already going away */
1797extern struct mm_struct *get_task_mm(struct task_struct *task);
1798/* Remove the current tasks stale references to the old mm_struct */
1799extern void mm_release(struct task_struct *, struct mm_struct *);
Carsten Otte402b0862008-03-25 18:47:10 +01001800/* Allocate a new mm structure and copy contents from tsk->mm */
1801extern struct mm_struct *dup_mm(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802
1803extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1804extern void flush_thread(void);
1805extern void exit_thread(void);
1806
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807extern void exit_files(struct task_struct *);
Oleg Nesterov6b3934e2006-03-28 16:11:16 -08001808extern void __cleanup_signal(struct signal_struct *);
Oleg Nesterova7e53282006-03-28 16:11:27 -08001809extern void __cleanup_sighand(struct sighand_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810extern void exit_itimers(struct signal_struct *);
1811
1812extern NORET_TYPE void do_group_exit(int);
1813
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814extern void daemonize(const char *, ...);
1815extern int allow_signal(int);
1816extern int disallow_signal(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817
1818extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1819extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
Ingo Molnar36c8b582006-07-03 00:25:41 -07001820struct task_struct *fork_idle(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821
1822extern void set_task_comm(struct task_struct *tsk, char *from);
Andrew Morton59714d62008-02-04 22:27:21 -08001823extern char *get_task_comm(char *to, struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824
1825#ifdef CONFIG_SMP
Ingo Molnar36c8b582006-07-03 00:25:41 -07001826extern void wait_task_inactive(struct task_struct * p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827#else
1828#define wait_task_inactive(p) do { } while (0)
1829#endif
1830
1831#define remove_parent(p) list_del_init(&(p)->sibling)
Oleg Nesterov8fafabd2006-03-28 16:11:05 -08001832#define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833
Eric W. Biederman5e85d4a2006-04-18 22:20:16 -07001834#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835
1836#define for_each_process(p) \
1837 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1838
1839/*
1840 * Careful: do_each_thread/while_each_thread is a double loop so
1841 * 'break' will not work as expected - use goto instead.
1842 */
1843#define do_each_thread(g, t) \
1844 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1845
1846#define while_each_thread(g, t) \
1847 while ((t = next_thread(t)) != g)
1848
Eric W. Biedermande12a782006-04-10 17:16:49 -06001849/* de_thread depends on thread_group_leader not being a pid based check */
1850#define thread_group_leader(p) (p == p->group_leader)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851
Eric W. Biederman0804ef42006-10-02 02:17:04 -07001852/* Do to the insanities of de_thread it is possible for a process
1853 * to have the pid of the thread group leader without actually being
1854 * the thread group leader. For iteration through the pids in proc
1855 * all we care about is that we have a task with the appropriate
1856 * pid, we don't actually care if we have the right task.
1857 */
Alexey Dobriyane8681712007-10-26 12:17:22 +04001858static inline int has_group_leader_pid(struct task_struct *p)
Eric W. Biederman0804ef42006-10-02 02:17:04 -07001859{
1860 return p->pid == p->tgid;
1861}
1862
Pavel Emelyanovbac0abd2007-10-18 23:40:18 -07001863static inline
1864int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1865{
1866 return p1->tgid == p2->tgid;
1867}
1868
Ingo Molnar36c8b582006-07-03 00:25:41 -07001869static inline struct task_struct *next_thread(const struct task_struct *p)
Oleg Nesterov47e65322006-03-28 16:11:25 -08001870{
1871 return list_entry(rcu_dereference(p->thread_group.next),
Ingo Molnar36c8b582006-07-03 00:25:41 -07001872 struct task_struct, thread_group);
Oleg Nesterov47e65322006-03-28 16:11:25 -08001873}
1874
Alexey Dobriyane8681712007-10-26 12:17:22 +04001875static inline int thread_group_empty(struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876{
Oleg Nesterov47e65322006-03-28 16:11:25 -08001877 return list_empty(&p->thread_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878}
1879
1880#define delay_group_leader(p) \
1881 (thread_group_leader(p) && !thread_group_empty(p))
1882
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883/*
Eric W. Biederman260ea102006-06-23 02:05:18 -07001884 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
Jens Axboe22e2c502005-06-27 10:55:12 +02001885 * subscriptions and synchronises with wait4(). Also used in procfs. Also
Paul Menageddbcc7e2007-10-18 23:39:30 -07001886 * pins the final release of task.io_context. Also protects ->cpuset and
1887 * ->cgroup.subsys[].
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888 *
1889 * Nests both inside and outside of read_lock(&tasklist_lock).
1890 * It must not be nested with write_lock_irq(&tasklist_lock),
1891 * neither inside nor outside.
1892 */
1893static inline void task_lock(struct task_struct *p)
1894{
1895 spin_lock(&p->alloc_lock);
1896}
1897
1898static inline void task_unlock(struct task_struct *p)
1899{
1900 spin_unlock(&p->alloc_lock);
1901}
1902
Oleg Nesterovf63ee722006-03-28 16:11:13 -08001903extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1904 unsigned long *flags);
1905
1906static inline void unlock_task_sighand(struct task_struct *tsk,
1907 unsigned long *flags)
1908{
1909 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1910}
1911
Al Virof0373602005-11-13 16:06:57 -08001912#ifndef __HAVE_THREAD_FUNCTIONS
1913
Roman Zippelf7e42172007-05-09 02:35:17 -07001914#define task_thread_info(task) ((struct thread_info *)(task)->stack)
1915#define task_stack_page(task) ((task)->stack)
Al Viroa1261f52005-11-13 16:06:55 -08001916
Al Viro10ebffd2005-11-13 16:06:56 -08001917static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1918{
1919 *task_thread_info(p) = *task_thread_info(org);
1920 task_thread_info(p)->task = p;
1921}
1922
1923static inline unsigned long *end_of_stack(struct task_struct *p)
1924{
Roman Zippelf7e42172007-05-09 02:35:17 -07001925 return (unsigned long *)(task_thread_info(p) + 1);
Al Viro10ebffd2005-11-13 16:06:56 -08001926}
1927
Al Virof0373602005-11-13 16:06:57 -08001928#endif
1929
Benjamin Herrenschmidt8c9843e2008-04-18 16:56:15 +10001930extern void thread_info_cache_init(void);
1931
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932/* set thread flags in other task's structures
1933 * - see asm/thread_info.h for TIF_xxxx flags available
1934 */
1935static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1936{
Al Viroa1261f52005-11-13 16:06:55 -08001937 set_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938}
1939
1940static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1941{
Al Viroa1261f52005-11-13 16:06:55 -08001942 clear_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943}
1944
1945static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1946{
Al Viroa1261f52005-11-13 16:06:55 -08001947 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948}
1949
1950static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1951{
Al Viroa1261f52005-11-13 16:06:55 -08001952 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953}
1954
1955static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1956{
Al Viroa1261f52005-11-13 16:06:55 -08001957 return test_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958}
1959
1960static inline void set_tsk_need_resched(struct task_struct *tsk)
1961{
1962 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1963}
1964
1965static inline void clear_tsk_need_resched(struct task_struct *tsk)
1966{
1967 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1968}
1969
1970static inline int signal_pending(struct task_struct *p)
1971{
1972 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1973}
Matthew Wilcoxf776d122007-12-06 11:15:50 -05001974
Harvey Harrisonb3c97522008-02-13 15:03:15 -08001975extern int __fatal_signal_pending(struct task_struct *p);
Matthew Wilcoxf776d122007-12-06 11:15:50 -05001976
1977static inline int fatal_signal_pending(struct task_struct *p)
1978{
1979 return signal_pending(p) && __fatal_signal_pending(p);
1980}
1981
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982static inline int need_resched(void)
1983{
1984 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1985}
1986
1987/*
1988 * cond_resched() and cond_resched_lock(): latency reduction via
1989 * explicit rescheduling in places that are safe. The return
1990 * value indicates whether a reschedule was done in fact.
1991 * cond_resched_lock() will drop the spinlock before scheduling,
1992 * cond_resched_softirq() will enable bhs before scheduling.
1993 */
Herbert Xu02b67cc32008-01-25 21:08:28 +01001994#ifdef CONFIG_PREEMPT
1995static inline int cond_resched(void)
1996{
1997 return 0;
1998}
1999#else
2000extern int _cond_resched(void);
2001static inline int cond_resched(void)
2002{
2003 return _cond_resched();
2004}
2005#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006extern int cond_resched_lock(spinlock_t * lock);
2007extern int cond_resched_softirq(void);
2008
2009/*
2010 * Does a critical section need to be broken due to another
Nick Piggin95c354f2008-01-30 13:31:20 +01002011 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2012 * but a general need for low latency)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013 */
Nick Piggin95c354f2008-01-30 13:31:20 +01002014static inline int spin_needbreak(spinlock_t *lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002015{
Nick Piggin95c354f2008-01-30 13:31:20 +01002016#ifdef CONFIG_PREEMPT
2017 return spin_is_contended(lock);
2018#else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019 return 0;
Nick Piggin95c354f2008-01-30 13:31:20 +01002020#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021}
2022
Roland McGrath7bb44ad2007-05-23 13:57:44 -07002023/*
2024 * Reevaluate whether the task has signals pending delivery.
2025 * Wake the task if so.
2026 * This is required every time the blocked sigset_t changes.
2027 * callers must hold sighand->siglock.
2028 */
2029extern void recalc_sigpending_and_wake(struct task_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030extern void recalc_sigpending(void);
2031
2032extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2033
2034/*
2035 * Wrappers for p->thread_info->cpu access. No-op on UP.
2036 */
2037#ifdef CONFIG_SMP
2038
2039static inline unsigned int task_cpu(const struct task_struct *p)
2040{
Al Viroa1261f52005-11-13 16:06:55 -08002041 return task_thread_info(p)->cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042}
2043
Ingo Molnarc65cc872007-07-09 18:51:58 +02002044extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045
2046#else
2047
2048static inline unsigned int task_cpu(const struct task_struct *p)
2049{
2050 return 0;
2051}
2052
2053static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2054{
2055}
2056
2057#endif /* CONFIG_SMP */
2058
2059#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
2060extern void arch_pick_mmap_layout(struct mm_struct *mm);
2061#else
2062static inline void arch_pick_mmap_layout(struct mm_struct *mm)
2063{
2064 mm->mmap_base = TASK_UNMAPPED_BASE;
2065 mm->get_unmapped_area = arch_get_unmapped_area;
2066 mm->unmap_area = arch_unmap_area;
2067}
2068#endif
2069
Mike Travisb53e9212008-04-04 18:11:08 -07002070extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
2072
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -07002073extern int sched_mc_power_savings, sched_smt_power_savings;
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -07002074
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075extern void normalize_rt_tasks(void);
2076
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002077#ifdef CONFIG_GROUP_SCHED
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002078
Ingo Molnar4cf86d72007-10-15 17:00:14 +02002079extern struct task_group init_task_group;
Peter Zijlstraeff766a2008-04-19 19:45:00 +02002080#ifdef CONFIG_USER_SCHED
2081extern struct task_group root_task_group;
2082#endif
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002083
Dhaval Gianiec7dc8a2008-04-19 19:44:59 +02002084extern struct task_group *sched_create_group(struct task_group *parent);
Ingo Molnar4cf86d72007-10-15 17:00:14 +02002085extern void sched_destroy_group(struct task_group *tg);
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002086extern void sched_move_task(struct task_struct *tsk);
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002087#ifdef CONFIG_FAIR_GROUP_SCHED
Ingo Molnar4cf86d72007-10-15 17:00:14 +02002088extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
Dhaval Giani5cb350b2007-10-15 17:00:14 +02002089extern unsigned long sched_group_shares(struct task_group *tg);
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002090#endif
2091#ifdef CONFIG_RT_GROUP_SCHED
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +01002092extern int sched_group_set_rt_runtime(struct task_group *tg,
2093 long rt_runtime_us);
2094extern long sched_group_rt_runtime(struct task_group *tg);
Peter Zijlstrad0b27fa2008-04-19 19:44:57 +02002095extern int sched_group_set_rt_period(struct task_group *tg,
2096 long rt_period_us);
2097extern long sched_group_rt_period(struct task_group *tg);
Peter Zijlstra052f1dc2008-02-13 15:45:40 +01002098#endif
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02002099#endif
2100
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08002101#ifdef CONFIG_TASK_XACCT
2102static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2103{
2104 tsk->rchar += amt;
2105}
2106
2107static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2108{
2109 tsk->wchar += amt;
2110}
2111
2112static inline void inc_syscr(struct task_struct *tsk)
2113{
2114 tsk->syscr++;
2115}
2116
2117static inline void inc_syscw(struct task_struct *tsk)
2118{
2119 tsk->syscw++;
2120}
2121#else
2122static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2123{
2124}
2125
2126static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2127{
2128}
2129
2130static inline void inc_syscr(struct task_struct *tsk)
2131{
2132}
2133
2134static inline void inc_syscw(struct task_struct *tsk)
2135{
2136}
2137#endif
2138
Adrian Bunke6fe6642007-11-09 22:39:39 +01002139#ifdef CONFIG_SMP
2140void migration_init(void);
2141#else
2142static inline void migration_init(void)
2143{
2144}
2145#endif
2146
Dave Hansen82455252008-02-04 22:28:59 -08002147#ifndef TASK_SIZE_OF
2148#define TASK_SIZE_OF(tsk) TASK_SIZE
2149#endif
2150
Balbir Singhcf475ad2008-04-29 01:00:16 -07002151#ifdef CONFIG_MM_OWNER
2152extern void mm_update_next_owner(struct mm_struct *mm);
2153extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2154#else
2155static inline void mm_update_next_owner(struct mm_struct *mm)
2156{
2157}
2158
2159static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2160{
2161}
2162#endif /* CONFIG_MM_OWNER */
2163
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164#endif /* __KERNEL__ */
2165
2166#endif