blob: 3a6e05e777154cbe7843408677e258f37bfb836a [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#include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
5
6/*
7 * cloning flags:
8 */
9#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
10#define CLONE_VM 0x00000100 /* set if VM shared between processes */
11#define CLONE_FS 0x00000200 /* set if fs info shared between processes */
12#define CLONE_FILES 0x00000400 /* set if open files shared between processes */
13#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
14#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
15#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
16#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
17#define CLONE_THREAD 0x00010000 /* Same thread group? */
18#define CLONE_NEWNS 0x00020000 /* New namespace group? */
19#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
20#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
21#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
22#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
23#define CLONE_DETACHED 0x00400000 /* Unused, ignored */
24#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
25#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
26#define CLONE_STOPPED 0x02000000 /* Start in stopped state */
Serge E. Hallyn071df102006-10-02 02:18:17 -070027#define CLONE_NEWUTS 0x04000000 /* New utsname group? */
Kirill Korotaev25b21cb2006-10-02 02:18:19 -070028#define CLONE_NEWIPC 0x08000000 /* New ipcs */
Serge E. Hallyn77ec7392007-07-15 23:41:01 -070029#define CLONE_NEWUSER 0x10000000 /* New user namespace */
Eric W. Biederman169e3672007-09-27 17:10:06 -070030#define CLONE_NEWNET 0x40000000 /* New network namespace */
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>
61
62#include <asm/system.h>
63#include <asm/semaphore.h>
64#include <asm/page.h>
65#include <asm/ptrace.h>
66#include <asm/mmu.h>
67#include <asm/cputime.h>
68
69#include <linux/smp.h>
70#include <linux/sem.h>
71#include <linux/signal.h>
72#include <linux/securebits.h>
73#include <linux/fs_struct.h>
74#include <linux/compiler.h>
75#include <linux/completion.h>
76#include <linux/pid.h>
77#include <linux/percpu.h>
78#include <linux/topology.h>
79#include <linux/seccomp.h>
Ingo Molnare56d0902006-01-08 01:01:37 -080080#include <linux/rcupdate.h>
Ingo Molnar0771dfe2006-03-27 01:16:22 -080081#include <linux/futex.h>
Ingo Molnar23f78d4a2006-06-27 02:54:53 -070082#include <linux/rtmutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
David Woodhousea3b67142006-04-25 14:54:40 +010084#include <linux/time.h>
85#include <linux/param.h>
86#include <linux/resource.h>
87#include <linux/timer.h>
88#include <linux/hrtimer.h>
Andrew Morton7c3ab732006-12-10 02:19:19 -080089#include <linux/task_io_accounting.h>
Dhaval Giani5cb350b2007-10-15 17:00:14 +020090#include <linux/kobject.h>
David Woodhousea3b67142006-04-25 14:54:40 +010091
92#include <asm/processor.h>
H. J. Lu36d57ac2005-09-06 15:16:49 -070093
Linus Torvalds1da177e2005-04-16 15:20:36 -070094struct exec_domain;
Ingo Molnarc87e2832006-06-27 02:54:58 -070095struct futex_pi_state;
Neil Brownd89d8792007-05-01 09:53:42 +020096struct bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 * List of flags we want to share for kernel threads,
100 * if only because they are not used by them anyway.
101 */
102#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
103
104/*
105 * These are the constant used to fake the fixed-point load-average
106 * counting. Some notes:
107 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
108 * a load-average precision of 10 bits integer + 11 bits fractional
109 * - if you want to count load-averages more often, you need more
110 * precision, or rounding will get you. With 2-second counting freq,
111 * the EXP_n values would be 1981, 2034 and 2043 if still using only
112 * 11 bit fractions.
113 */
114extern unsigned long avenrun[]; /* Load averages */
115
116#define FSHIFT 11 /* nr of bits of precision */
117#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
Linus Torvalds0c2043a2007-10-07 16:17:38 -0700118#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
120#define EXP_5 2014 /* 1/exp(5sec/5min) */
121#define EXP_15 2037 /* 1/exp(5sec/15min) */
122
123#define CALC_LOAD(load,exp,n) \
124 load *= exp; \
125 load += n*(FIXED_1-exp); \
126 load >>= FSHIFT;
127
128extern unsigned long total_forks;
129extern int nr_threads;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130DECLARE_PER_CPU(unsigned long, process_counts);
131extern int nr_processes(void);
132extern unsigned long nr_running(void);
133extern unsigned long nr_uninterruptible(void);
Jack Steinerdb1b1fe2006-03-31 02:31:21 -0800134extern unsigned long nr_active(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135extern unsigned long nr_iowait(void);
Peter Williams2dd73a42006-06-27 02:54:34 -0700136extern unsigned long weighted_cpuload(const int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200138struct seq_file;
139struct cfs_rq;
Ingo Molnar4cf86d72007-10-15 17:00:14 +0200140struct task_group;
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200141#ifdef CONFIG_SCHED_DEBUG
142extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
143extern void proc_sched_set_task(struct task_struct *p);
144extern void
Ingo Molnar5cef9ec2007-08-09 11:16:47 +0200145print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200146#else
147static inline void
148proc_sched_show_task(struct task_struct *p, struct seq_file *m)
149{
150}
151static inline void proc_sched_set_task(struct task_struct *p)
152{
153}
154static inline void
Ingo Molnar5cef9ec2007-08-09 11:16:47 +0200155print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200156{
157}
158#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Linus Torvalds4a8342d2005-09-29 15:18:21 -0700160/*
161 * Task state bitmask. NOTE! These bits are also
162 * encoded in fs/proc/array.c: get_task_state().
163 *
164 * We have two separate sets of flags: task->state
165 * is about runnability, while task->exit_state are
166 * about the task exiting. Confusing, but this way
167 * modifying one set can't modify the other one by
168 * mistake.
169 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170#define TASK_RUNNING 0
171#define TASK_INTERRUPTIBLE 1
172#define TASK_UNINTERRUPTIBLE 2
Linus Torvalds4a8342d2005-09-29 15:18:21 -0700173#define TASK_STOPPED 4
174#define TASK_TRACED 8
175/* in tsk->exit_state */
176#define EXIT_ZOMBIE 16
177#define EXIT_DEAD 32
178/* in tsk->state again */
Mike Galbraithaf927232007-10-15 17:00:13 +0200179#define TASK_DEAD 64
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
181#define __set_task_state(tsk, state_value) \
182 do { (tsk)->state = (state_value); } while (0)
183#define set_task_state(tsk, state_value) \
184 set_mb((tsk)->state, (state_value))
185
Andrew Morton498d0c52005-09-13 01:25:14 -0700186/*
187 * set_current_state() includes a barrier so that the write of current->state
188 * is correctly serialised wrt the caller's subsequent test of whether to
189 * actually sleep:
190 *
191 * set_current_state(TASK_UNINTERRUPTIBLE);
192 * if (do_i_need_to_sleep())
193 * schedule();
194 *
195 * If the caller does not need such serialisation then use __set_current_state()
196 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197#define __set_current_state(state_value) \
198 do { current->state = (state_value); } while (0)
199#define set_current_state(state_value) \
200 set_mb(current->state, (state_value))
201
202/* Task command name length */
203#define TASK_COMM_LEN 16
204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205#include <linux/spinlock.h>
206
207/*
208 * This serializes "schedule()" and also protects
209 * the run-queue from deletions/modifications (but
210 * _adding_ to the beginning of the run-queue has
211 * a separate lock).
212 */
213extern rwlock_t tasklist_lock;
214extern spinlock_t mmlist_lock;
215
Ingo Molnar36c8b582006-07-03 00:25:41 -0700216struct task_struct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218extern void sched_init(void);
219extern void sched_init_smp(void);
Ingo Molnar36c8b582006-07-03 00:25:41 -0700220extern void init_idle(struct task_struct *idle, int cpu);
Ingo Molnar1df21052007-07-09 18:51:58 +0200221extern void init_idle_bootup_task(struct task_struct *idle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
223extern cpumask_t nohz_cpu_mask;
Siddha, Suresh B46cb4b72007-05-08 00:32:51 -0700224#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
225extern int select_nohz_load_balancer(int cpu);
226#else
227static inline int select_nohz_load_balancer(int cpu)
228{
229 return 0;
230}
231#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800233/*
Ingo Molnar39bc89f2007-04-25 20:50:03 -0700234 * Only dump TASK_* tasks. (0 for all tasks)
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800235 */
236extern void show_state_filter(unsigned long state_filter);
237
238static inline void show_state(void)
239{
Ingo Molnar39bc89f2007-04-25 20:50:03 -0700240 show_state_filter(0);
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800241}
242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243extern void show_regs(struct pt_regs *);
244
245/*
246 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
247 * task), SP is the stack pointer of the first frame that should be shown in the back
248 * trace (or NULL if the entire call-chain of the task should be shown).
249 */
250extern void show_stack(struct task_struct *task, unsigned long *sp);
251
252void io_schedule(void);
253long io_schedule_timeout(long timeout);
254
255extern void cpu_init (void);
256extern void trap_init(void);
257extern void update_process_times(int user);
258extern void scheduler_tick(void);
259
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700260#ifdef CONFIG_DETECT_SOFTLOCKUP
Ingo Molnar6687a972006-03-24 03:18:41 -0800261extern void softlockup_tick(void);
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700262extern void spawn_softlockup_task(void);
263extern void touch_softlockup_watchdog(void);
Jeremy Fitzhardinge04c91672007-05-08 00:28:05 -0700264extern void touch_all_softlockup_watchdogs(void);
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700265#else
Ingo Molnar6687a972006-03-24 03:18:41 -0800266static inline void softlockup_tick(void)
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700267{
268}
269static inline void spawn_softlockup_task(void)
270{
271}
272static inline void touch_softlockup_watchdog(void)
273{
274}
Jeremy Fitzhardinge04c91672007-05-08 00:28:05 -0700275static inline void touch_all_softlockup_watchdogs(void)
276{
277}
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700278#endif
279
280
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281/* Attach to any functions which should be ignored in wchan output. */
282#define __sched __attribute__((__section__(".sched.text")))
283/* Is this address in the __sched functions? */
284extern int in_sched_functions(unsigned long addr);
285
286#define MAX_SCHEDULE_TIMEOUT LONG_MAX
287extern signed long FASTCALL(schedule_timeout(signed long timeout));
Nishanth Aravamudan64ed93a2005-09-10 00:27:21 -0700288extern signed long schedule_timeout_interruptible(signed long timeout);
289extern signed long schedule_timeout_uninterruptible(signed long timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290asmlinkage void schedule(void);
291
Serge E. Hallynab516012006-10-02 02:18:06 -0700292struct nsproxy;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700293struct user_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295/* Maximum number of active map areas.. This is a random (large) number */
296#define DEFAULT_MAX_MAP_COUNT 65536
297
298extern int sysctl_max_map_count;
299
300#include <linux/aio.h>
301
302extern unsigned long
303arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
304 unsigned long, unsigned long);
305extern unsigned long
306arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
307 unsigned long len, unsigned long pgoff,
308 unsigned long flags);
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700309extern void arch_unmap_area(struct mm_struct *, unsigned long);
310extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700312#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
313/*
314 * The mm counters are not protected by its page_table_lock,
315 * so must be incremented atomically.
316 */
Christoph Lameterd3cb4872006-01-06 00:11:20 -0800317#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
318#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
319#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
320#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
321#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
322typedef atomic_long_t mm_counter_t;
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700323
324#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
325/*
326 * The mm counters are protected by its page_table_lock,
327 * so can be incremented directly.
328 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
330#define get_mm_counter(mm, member) ((mm)->_##member)
331#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
332#define inc_mm_counter(mm, member) (mm)->_##member++
333#define dec_mm_counter(mm, member) (mm)->_##member--
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700334typedef unsigned long mm_counter_t;
Hugh Dickins42946212005-10-29 18:16:05 -0700335
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700336#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
337
338#define get_mm_rss(mm) \
339 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
Hugh Dickins365e9c872005-10-29 18:16:18 -0700340#define update_hiwater_rss(mm) do { \
341 unsigned long _rss = get_mm_rss(mm); \
342 if ((mm)->hiwater_rss < _rss) \
343 (mm)->hiwater_rss = _rss; \
344} while (0)
345#define update_hiwater_vm(mm) do { \
346 if ((mm)->hiwater_vm < (mm)->total_vm) \
347 (mm)->hiwater_vm = (mm)->total_vm; \
348} while (0)
349
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700350extern void set_dumpable(struct mm_struct *mm, int value);
351extern int get_dumpable(struct mm_struct *mm);
352
353/* mm flags */
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700354/* dumpable bits */
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700355#define MMF_DUMPABLE 0 /* core dump is permitted */
356#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700357#define MMF_DUMPABLE_BITS 2
358
359/* coredump filter bits */
360#define MMF_DUMP_ANON_PRIVATE 2
361#define MMF_DUMP_ANON_SHARED 3
362#define MMF_DUMP_MAPPED_PRIVATE 4
363#define MMF_DUMP_MAPPED_SHARED 5
364#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
365#define MMF_DUMP_FILTER_BITS 4
366#define MMF_DUMP_FILTER_MASK \
367 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
368#define MMF_DUMP_FILTER_DEFAULT \
369 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371struct mm_struct {
372 struct vm_area_struct * mmap; /* list of VMAs */
373 struct rb_root mm_rb;
374 struct vm_area_struct * mmap_cache; /* last find_vma result */
375 unsigned long (*get_unmapped_area) (struct file *filp,
376 unsigned long addr, unsigned long len,
377 unsigned long pgoff, unsigned long flags);
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700378 void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
Benjamin Herrenschmidt0551fbd2006-02-28 16:59:19 -0800379 unsigned long mmap_base; /* base of mmap area */
380 unsigned long task_size; /* size of task vm space */
381 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700382 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 pgd_t * pgd;
384 atomic_t mm_users; /* How many users with user space? */
385 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
386 int map_count; /* number of VMAs */
387 struct rw_semaphore mmap_sem;
388 spinlock_t page_table_lock; /* Protects page tables and some counters */
389
390 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
391 * together off init_mm.mmlist, and are protected
392 * by mmlist_lock
393 */
394
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700395 /* Special counters, in some configurations protected by the
396 * page_table_lock, in other configurations by being atomic.
397 */
Hugh Dickins42946212005-10-29 18:16:05 -0700398 mm_counter_t _file_rss;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 mm_counter_t _anon_rss;
400
Hugh Dickinsf4499522005-10-29 18:16:19 -0700401 unsigned long hiwater_rss; /* High-watermark of RSS usage */
402 unsigned long hiwater_vm; /* High-water virtual memory usage */
403
404 unsigned long total_vm, locked_vm, shared_vm, exec_vm;
405 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
406 unsigned long start_code, end_code, start_data, end_data;
407 unsigned long start_brk, brk, start_stack;
408 unsigned long arg_start, arg_end, env_start, env_end;
409
H. J. Lu36d57ac2005-09-06 15:16:49 -0700410 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 cpumask_t cpu_vm_mask;
413
414 /* Architecture-specific MM context */
415 mm_context_t context;
416
Ashwin Chaugule7602bdf2006-12-06 20:31:57 -0800417 /* Swap token stuff */
418 /*
419 * Last value of global fault stamp as seen by this process.
420 * In other words, this value gives an indication of how long
421 * it has been since this task got the token.
422 * Look at mm/thrash.c
423 */
424 unsigned int faultstamp;
425 unsigned int token_priority;
426 unsigned int last_interval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700428 unsigned long flags; /* Must use atomic bitops to access the bits */
Arnaldo Carvalho de Melo36de6432006-12-06 20:33:42 -0800429
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 /* coredumping support */
431 int core_waiters;
432 struct completion *core_startup_done, core_done;
433
434 /* aio bits */
435 rwlock_t ioctx_list_lock;
436 struct kioctx *ioctx_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437};
438
439struct sighand_struct {
440 atomic_t count;
441 struct k_sigaction action[_NSIG];
442 spinlock_t siglock;
Davide Libenzib8fceee2007-09-20 12:40:16 -0700443 wait_queue_head_t signalfd_wqh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444};
445
KaiGai Kohei0e464812006-06-25 05:49:24 -0700446struct pacct_struct {
KaiGai Koheif6ec29a2006-06-25 05:49:25 -0700447 int ac_flag;
448 long ac_exitcode;
KaiGai Kohei0e464812006-06-25 05:49:24 -0700449 unsigned long ac_mem;
KaiGai Kohei77787bf2006-06-25 05:49:26 -0700450 cputime_t ac_utime, ac_stime;
451 unsigned long ac_minflt, ac_majflt;
KaiGai Kohei0e464812006-06-25 05:49:24 -0700452};
453
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454/*
455 * NOTE! "signal_struct" does not have it's own
456 * locking, because a shared signal_struct always
457 * implies a shared sighand_struct, so locking
458 * sighand_struct is always a proper superset of
459 * the locking of signal_struct.
460 */
461struct signal_struct {
462 atomic_t count;
463 atomic_t live;
464
465 wait_queue_head_t wait_chldexit; /* for wait4() */
466
467 /* current thread group signal load-balancing target: */
Ingo Molnar36c8b582006-07-03 00:25:41 -0700468 struct task_struct *curr_target;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
470 /* shared signal handling: */
471 struct sigpending shared_pending;
472
473 /* thread group exit support */
474 int group_exit_code;
475 /* overloaded:
476 * - notify group_exit_task when ->count is equal to notify_count
477 * - everyone except group_exit_task is stopped during signal delivery
478 * of fatal signals, group_exit_task processes the signal.
479 */
480 struct task_struct *group_exit_task;
481 int notify_count;
482
483 /* thread group stop support, overloads group_exit_code too */
484 int group_stop_count;
485 unsigned int flags; /* see SIGNAL_* flags below */
486
487 /* POSIX.1b Interval Timers */
488 struct list_head posix_timers;
489
490 /* ITIMER_REAL timer for the process */
Thomas Gleixner2ff678b2006-01-09 20:52:34 -0800491 struct hrtimer real_timer;
Roman Zippel05cfb612006-03-26 01:38:12 -0800492 struct task_struct *tsk;
Thomas Gleixner2ff678b2006-01-09 20:52:34 -0800493 ktime_t it_real_incr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
495 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
496 cputime_t it_prof_expires, it_virt_expires;
497 cputime_t it_prof_incr, it_virt_incr;
498
499 /* job control IDs */
500 pid_t pgrp;
Eric W. Biedermanab521dc2007-02-12 00:53:00 -0800501 struct pid *tty_old_pgrp;
Cedric Le Goater1ec320a2006-12-08 02:37:55 -0800502
503 union {
504 pid_t session __deprecated;
505 pid_t __session;
506 };
507
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 /* boolean value for session group leader */
509 int leader;
510
511 struct tty_struct *tty; /* NULL if no tty */
512
513 /*
514 * Cumulative resource counters for dead threads in the group,
515 * and for reaped dead child processes forked by this group.
516 * Live threads maintain their own counters and add to these
517 * in __exit_signal, except for the group leader.
518 */
519 cputime_t utime, stime, cutime, cstime;
520 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
521 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
Eric Dumazet6eaeeab2007-05-10 22:22:37 -0700522 unsigned long inblock, oublock, cinblock, coublock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524 /*
525 * Cumulative ns of scheduled CPU time for dead threads in the
526 * group, not including a zombie group leader. (This only differs
527 * from jiffies_to_ns(utime + stime) if sched_clock uses something
528 * other than jiffies.)
529 */
Ingo Molnar41b86e92007-07-09 18:51:58 +0200530 unsigned long long sum_sched_runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
532 /*
533 * We don't bother to synchronize most readers of this at all,
534 * because there is no reader checking a limit that actually needs
535 * to get both rlim_cur and rlim_max atomically, and either one
536 * alone is a single word that can safely be read normally.
537 * getrlimit/setrlimit use task_lock(current->group_leader) to
538 * protect this instead of the siglock, because they really
539 * have no need to disable irqs.
540 */
541 struct rlimit rlim[RLIM_NLIMITS];
542
543 struct list_head cpu_timers[3];
544
545 /* keep the process-shared keyrings here so that they do the right
546 * thing in threads created with CLONE_THREAD */
547#ifdef CONFIG_KEYS
548 struct key *session_keyring; /* keyring inherited over fork */
549 struct key *process_keyring; /* keyring private to this process */
550#endif
KaiGai Kohei0e464812006-06-25 05:49:24 -0700551#ifdef CONFIG_BSD_PROCESS_ACCT
552 struct pacct_struct pacct; /* per-process accounting information */
553#endif
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700554#ifdef CONFIG_TASKSTATS
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700555 struct taskstats *stats;
556#endif
Miloslav Trmac522ed772007-07-15 23:40:56 -0700557#ifdef CONFIG_AUDIT
558 unsigned audit_tty;
559 struct tty_audit_buf *tty_audit_buf;
560#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561};
562
Nick Piggin4866cde2005-06-25 14:57:23 -0700563/* Context switch must be unlocked if interrupts are to be enabled */
564#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
565# define __ARCH_WANT_UNLOCKED_CTXSW
566#endif
567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568/*
569 * Bits in flags field of signal_struct.
570 */
571#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
572#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
573#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
574#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
575
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576/*
577 * Some day this will be a full-fledged user tracking system..
578 */
579struct user_struct {
580 atomic_t __count; /* reference count */
581 atomic_t processes; /* How many processes does this user have? */
582 atomic_t files; /* How many open files does this user have? */
583 atomic_t sigpending; /* How many pending signals does this user have? */
Amy Griffis2d9048e2006-06-01 13:10:59 -0700584#ifdef CONFIG_INOTIFY_USER
Robert Love0eeca282005-07-12 17:06:03 -0400585 atomic_t inotify_watches; /* How many inotify watches does this user have? */
586 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
587#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 /* protected by mq_lock */
589 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
590 unsigned long locked_shm; /* How many pages of mlocked shm ? */
591
592#ifdef CONFIG_KEYS
593 struct key *uid_keyring; /* UID specific keyring */
594 struct key *session_keyring; /* UID's default session keyring */
595#endif
596
597 /* Hash table maintenance information */
Pavel Emelyanov735de222007-09-18 22:46:44 -0700598 struct hlist_node uidhash_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 uid_t uid;
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200600
601#ifdef CONFIG_FAIR_USER_SCHED
Ingo Molnar4cf86d72007-10-15 17:00:14 +0200602 struct task_group *tg;
Dhaval Giani5cb350b2007-10-15 17:00:14 +0200603 struct kset kset;
604 struct subsys_attribute user_attr;
605 struct work_struct work;
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200606#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607};
608
Dhaval Giani5cb350b2007-10-15 17:00:14 +0200609#ifdef CONFIG_FAIR_USER_SCHED
610extern int uids_kobject_init(void);
611#else
612static inline int uids_kobject_init(void) { return 0; }
613#endif
614
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615extern struct user_struct *find_user(uid_t);
616
617extern struct user_struct root_user;
618#define INIT_USER (&root_user)
619
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620struct backing_dev_info;
621struct reclaim_state;
622
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700623#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624struct sched_info {
625 /* cumulative counters */
Ingo Molnar2d723762007-10-15 17:00:12 +0200626 unsigned long pcount; /* # of times run on this cpu */
Balbir Singh172ba842007-07-09 18:52:00 +0200627 unsigned long long cpu_time, /* time spent on the cpu */
628 run_delay; /* time spent waiting on a runqueue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
630 /* timestamps */
Balbir Singh172ba842007-07-09 18:52:00 +0200631 unsigned long long last_arrival,/* when we last ran on a cpu */
632 last_queued; /* when we were last queued to run */
Ingo Molnarb8efb562007-10-15 17:00:10 +0200633#ifdef CONFIG_SCHEDSTATS
634 /* BKL stats */
Ingo Molnar2d723762007-10-15 17:00:12 +0200635 unsigned long bkl_count;
Ingo Molnarb8efb562007-10-15 17:00:10 +0200636#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637};
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700638#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700640#ifdef CONFIG_SCHEDSTATS
Helge Deller15ad7cd2006-12-06 20:40:36 -0800641extern const struct file_operations proc_schedstat_operations;
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700642#endif /* CONFIG_SCHEDSTATS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
Shailabh Nagarca74e922006-07-14 00:24:36 -0700644#ifdef CONFIG_TASK_DELAY_ACCT
645struct task_delay_info {
646 spinlock_t lock;
647 unsigned int flags; /* Private per-task flags */
648
649 /* For each stat XXX, add following, aligned appropriately
650 *
651 * struct timespec XXX_start, XXX_end;
652 * u64 XXX_delay;
653 * u32 XXX_count;
654 *
655 * Atomicity of updates to XXX_delay, XXX_count protected by
656 * single lock above (split into XXX_lock if contention is an issue).
657 */
Shailabh Nagar0ff92242006-07-14 00:24:37 -0700658
659 /*
660 * XXX_count is incremented on every XXX operation, the delay
661 * associated with the operation is added to XXX_delay.
662 * XXX_delay contains the accumulated delay time in nanoseconds.
663 */
664 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
665 u64 blkio_delay; /* wait for sync block io completion */
666 u64 swapin_delay; /* wait for swapin block io completion */
667 u32 blkio_count; /* total count of the number of sync block */
668 /* io operations performed */
669 u32 swapin_count; /* total count of the number of swapin block */
670 /* io operations performed */
Shailabh Nagarca74e922006-07-14 00:24:36 -0700671};
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700672#endif /* CONFIG_TASK_DELAY_ACCT */
673
674static inline int sched_info_on(void)
675{
676#ifdef CONFIG_SCHEDSTATS
677 return 1;
678#elif defined(CONFIG_TASK_DELAY_ACCT)
679 extern int delayacct_on;
680 return delayacct_on;
681#else
682 return 0;
Shailabh Nagarca74e922006-07-14 00:24:36 -0700683#endif
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700684}
Shailabh Nagarca74e922006-07-14 00:24:36 -0700685
Ingo Molnard15bcfd2007-07-09 18:51:57 +0200686enum cpu_idle_type {
687 CPU_IDLE,
688 CPU_NOT_IDLE,
689 CPU_NEWLY_IDLE,
690 CPU_MAX_IDLE_TYPES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691};
692
693/*
694 * sched-domains (multiprocessor balancing) declarations:
695 */
Ingo Molnar9aa7b362007-07-09 18:51:58 +0200696
697/*
698 * Increase resolution of nice-level calculations:
699 */
700#define SCHED_LOAD_SHIFT 10
701#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
702
Suresh Siddhaf8700df2007-08-23 15:18:02 +0200703#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
Peter Williams2dd73a42006-06-27 02:54:34 -0700705#ifdef CONFIG_SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
707#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
708#define SD_BALANCE_EXEC 4 /* Balance on exec */
Nick Piggin147cbb42005-06-25 14:57:19 -0700709#define SD_BALANCE_FORK 8 /* Balance on fork, clone */
710#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
711#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
712#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
713#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700714#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700715#define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
Christoph Lameter08c183f2006-12-10 02:20:29 -0800716#define SD_SERIALIZE 1024 /* Only a single load balancing instance */
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700717
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700718#define BALANCE_FOR_MC_POWER \
719 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
720
721#define BALANCE_FOR_PKG_POWER \
722 ((sched_mc_power_savings || sched_smt_power_savings) ? \
723 SD_POWERSAVINGS_BALANCE : 0)
724
725#define test_sd_parent(sd, flag) ((sd->parent && \
726 (sd->parent->flags & flag)) ? 1 : 0)
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700727
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
729struct sched_group {
730 struct sched_group *next; /* Must be a circular list */
731 cpumask_t cpumask;
732
733 /*
734 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
735 * single CPU. This is read only (except for setup, hotplug CPU).
Eric Dumazet5517d862007-05-08 00:32:57 -0700736 * Note : Never change cpu_power without recompute its reciprocal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 */
Eric Dumazet5517d862007-05-08 00:32:57 -0700738 unsigned int __cpu_power;
739 /*
740 * reciprocal value of cpu_power to avoid expensive divides
741 * (see include/linux/reciprocal_div.h)
742 */
743 u32 reciprocal_cpu_power;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744};
745
746struct sched_domain {
747 /* These fields must be setup */
748 struct sched_domain *parent; /* top domain must be null terminated */
Siddha, Suresh B1a848872006-10-03 01:14:08 -0700749 struct sched_domain *child; /* bottom domain must be null terminated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 struct sched_group *groups; /* the balancing groups of the domain */
751 cpumask_t span; /* span of all CPUs in this domain */
752 unsigned long min_interval; /* Minimum balance interval ms */
753 unsigned long max_interval; /* Maximum balance interval ms */
754 unsigned int busy_factor; /* less balancing by factor if busy */
755 unsigned int imbalance_pct; /* No balance until over watermark */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
Nick Piggin78979862005-06-25 14:57:13 -0700757 unsigned int busy_idx;
758 unsigned int idle_idx;
759 unsigned int newidle_idx;
760 unsigned int wake_idx;
Nick Piggin147cbb42005-06-25 14:57:19 -0700761 unsigned int forkexec_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 int flags; /* See SD_* */
763
764 /* Runtime fields. */
765 unsigned long last_balance; /* init to jiffies. units in jiffies */
766 unsigned int balance_interval; /* initialise to 1. units in ms. */
767 unsigned int nr_balance_failed; /* initialise to 0 */
768
769#ifdef CONFIG_SCHEDSTATS
770 /* load_balance() stats */
Ingo Molnar2d723762007-10-15 17:00:12 +0200771 unsigned long lb_count[CPU_MAX_IDLE_TYPES];
Ingo Molnard15bcfd2007-07-09 18:51:57 +0200772 unsigned long lb_failed[CPU_MAX_IDLE_TYPES];
773 unsigned long lb_balanced[CPU_MAX_IDLE_TYPES];
774 unsigned long lb_imbalance[CPU_MAX_IDLE_TYPES];
775 unsigned long lb_gained[CPU_MAX_IDLE_TYPES];
776 unsigned long lb_hot_gained[CPU_MAX_IDLE_TYPES];
777 unsigned long lb_nobusyg[CPU_MAX_IDLE_TYPES];
778 unsigned long lb_nobusyq[CPU_MAX_IDLE_TYPES];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
780 /* Active load balancing */
Ingo Molnar2d723762007-10-15 17:00:12 +0200781 unsigned long alb_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 unsigned long alb_failed;
783 unsigned long alb_pushed;
784
Nick Piggin68767a02005-06-25 14:57:20 -0700785 /* SD_BALANCE_EXEC stats */
Ingo Molnar2d723762007-10-15 17:00:12 +0200786 unsigned long sbe_count;
Nick Piggin68767a02005-06-25 14:57:20 -0700787 unsigned long sbe_balanced;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 unsigned long sbe_pushed;
789
Nick Piggin68767a02005-06-25 14:57:20 -0700790 /* SD_BALANCE_FORK stats */
Ingo Molnar2d723762007-10-15 17:00:12 +0200791 unsigned long sbf_count;
Nick Piggin68767a02005-06-25 14:57:20 -0700792 unsigned long sbf_balanced;
793 unsigned long sbf_pushed;
794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 /* try_to_wake_up() stats */
796 unsigned long ttwu_wake_remote;
797 unsigned long ttwu_move_affine;
798 unsigned long ttwu_move_balance;
799#endif
800};
801
Srivatsa Vaddagiri51888ca2006-06-27 02:54:38 -0700802extern int partition_sched_domains(cpumask_t *partition1,
Dinakar Guniguntala1a20ff22005-06-25 14:57:33 -0700803 cpumask_t *partition2);
akpm@osdl.org198e2f12006-01-12 01:05:30 -0800804
akpm@osdl.org198e2f12006-01-12 01:05:30 -0800805#endif /* CONFIG_SMP */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
Con Kolivasd02c7a82007-07-26 13:40:43 +0200807/*
808 * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
809 * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
810 * task of nice 0 or enough lower priority tasks to bring up the
811 * weighted_cpuload
812 */
813static inline int above_background_load(void)
814{
815 unsigned long cpu;
816
817 for_each_online_cpu(cpu) {
818 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
819 return 1;
820 }
821 return 0;
822}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823
824struct io_context; /* See blkdev.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825struct cpuset;
826
827#define NGROUPS_SMALL 32
828#define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
829struct group_info {
830 int ngroups;
831 atomic_t usage;
832 gid_t small_block[NGROUPS_SMALL];
833 int nblocks;
834 gid_t *blocks[0];
835};
836
837/*
838 * get_group_info() must be called with the owning task locked (via task_lock())
839 * when task != current. The reason being that the vast majority of callers are
840 * looking at current->group_info, which can not be changed except by the
841 * current task. Changing current->group_info requires the task lock, too.
842 */
843#define get_group_info(group_info) do { \
844 atomic_inc(&(group_info)->usage); \
845} while (0)
846
847#define put_group_info(group_info) do { \
848 if (atomic_dec_and_test(&(group_info)->usage)) \
849 groups_free(group_info); \
850} while (0)
851
David Howells3e301482005-06-23 22:00:56 -0700852extern struct group_info *groups_alloc(int gidsetsize);
853extern void groups_free(struct group_info *group_info);
854extern int set_current_groups(struct group_info *group_info);
855extern int groups_search(struct group_info *group_info, gid_t grp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856/* access the groups "array" with this macro */
857#define GROUP_AT(gi, i) \
858 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
859
Chen, Kenneth W383f2832005-09-09 13:02:02 -0700860#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
Ingo Molnar36c8b582006-07-03 00:25:41 -0700861extern void prefetch_stack(struct task_struct *t);
Chen, Kenneth W383f2832005-09-09 13:02:02 -0700862#else
863static inline void prefetch_stack(struct task_struct *t) { }
864#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865
866struct audit_context; /* See audit.c */
867struct mempolicy;
Jens Axboeb92ce552006-04-11 13:52:07 +0200868struct pipe_inode_info;
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -0700869struct uts_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
Ingo Molnar20b8a592007-07-09 18:51:58 +0200871struct rq;
872struct sched_domain;
873
874struct sched_class {
Ingo Molnar5522d5d2007-10-15 17:00:12 +0200875 const struct sched_class *next;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200876
Ingo Molnarfd390f62007-08-09 11:16:48 +0200877 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
Ingo Molnarf02231e2007-08-09 11:16:48 +0200878 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
Dmitry Adamushko4530d7a2007-10-15 17:00:08 +0200879 void (*yield_task) (struct rq *rq);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200880
881 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
882
Ingo Molnarfb8d4722007-08-09 11:16:48 +0200883 struct task_struct * (*pick_next_task) (struct rq *rq);
Ingo Molnar31ee5292007-08-09 11:16:49 +0200884 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200885
Peter Williams43010652007-08-09 11:16:46 +0200886 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
Ingo Molnar20b8a592007-07-09 18:51:58 +0200887 struct rq *busiest,
888 unsigned long max_nr_move, unsigned long max_load_move,
889 struct sched_domain *sd, enum cpu_idle_type idle,
Peter Williamsa4ac01c2007-08-09 11:16:46 +0200890 int *all_pinned, int *this_best_prio);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200891
Srivatsa Vaddagiri83b699e2007-10-15 17:00:08 +0200892 void (*set_curr_task) (struct rq *rq);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200893 void (*task_tick) (struct rq *rq, struct task_struct *p);
Ingo Molnaree0827d2007-08-09 11:16:49 +0200894 void (*task_new) (struct rq *rq, struct task_struct *p);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200895};
896
897struct load_weight {
898 unsigned long weight, inv_weight;
899};
900
901/*
902 * CFS stats for a schedulable entity (task, task-group etc)
903 *
904 * Current field usage histogram:
905 *
906 * 4 se->block_start
907 * 4 se->run_node
908 * 4 se->sleep_start
Ingo Molnar20b8a592007-07-09 18:51:58 +0200909 * 6 se->load.weight
Ingo Molnar20b8a592007-07-09 18:51:58 +0200910 */
911struct sched_entity {
Ingo Molnar20b8a592007-07-09 18:51:58 +0200912 struct load_weight load; /* for load-balancing */
913 struct rb_node run_node;
914 unsigned int on_rq;
Mike Galbraith95938a32007-10-15 17:00:14 +0200915 int peer_preempt;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200916
Ingo Molnar20b8a592007-07-09 18:51:58 +0200917 u64 exec_start;
Ingo Molnar94c18222007-08-02 17:41:40 +0200918 u64 sum_exec_runtime;
Ingo Molnare9acbff2007-10-15 17:00:04 +0200919 u64 vruntime;
Ingo Molnarf6cf8912007-08-28 12:53:24 +0200920 u64 prev_sum_exec_runtime;
Ingo Molnar94c18222007-08-02 17:41:40 +0200921
922#ifdef CONFIG_SCHEDSTATS
923 u64 wait_start;
924 u64 wait_max;
Ingo Molnar94c18222007-08-02 17:41:40 +0200925
926 u64 sleep_start;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200927 u64 sleep_max;
Ingo Molnar94c18222007-08-02 17:41:40 +0200928 s64 sum_sleep_runtime;
929
930 u64 block_start;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200931 u64 block_max;
932 u64 exec_max;
Ingo Molnareba1ed42007-10-15 17:00:02 +0200933 u64 slice_max;
Ingo Molnarcc367732007-10-15 17:00:18 +0200934
935 u64 nr_migrations;
936 u64 nr_migrations_cold;
937 u64 nr_failed_migrations_affine;
938 u64 nr_failed_migrations_running;
939 u64 nr_failed_migrations_hot;
940 u64 nr_forced_migrations;
941 u64 nr_forced2_migrations;
942
943 u64 nr_wakeups;
944 u64 nr_wakeups_sync;
945 u64 nr_wakeups_migrate;
946 u64 nr_wakeups_local;
947 u64 nr_wakeups_remote;
948 u64 nr_wakeups_affine;
949 u64 nr_wakeups_affine_attempts;
950 u64 nr_wakeups_passive;
951 u64 nr_wakeups_idle;
Ingo Molnar94c18222007-08-02 17:41:40 +0200952#endif
953
Ingo Molnar20b8a592007-07-09 18:51:58 +0200954#ifdef CONFIG_FAIR_GROUP_SCHED
955 struct sched_entity *parent;
956 /* rq on which this entity is (to be) queued: */
957 struct cfs_rq *cfs_rq;
958 /* rq "owned" by this entity/group: */
959 struct cfs_rq *my_q;
960#endif
961};
Ingo Molnar70b97a72006-07-03 00:25:42 -0700962
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963struct task_struct {
964 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
Roman Zippelf7e42172007-05-09 02:35:17 -0700965 void *stack;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 atomic_t usage;
William Cohen97dc32c2007-05-08 00:23:41 -0700967 unsigned int flags; /* per process flags, defined below */
968 unsigned int ptrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -0700970 int lock_depth; /* BKL lock depth */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971
Peter Williams2dd73a42006-06-27 02:54:34 -0700972#ifdef CONFIG_SMP
973#ifdef __ARCH_WANT_UNLOCKED_CTXSW
Nick Piggin4866cde2005-06-25 14:57:23 -0700974 int oncpu;
975#endif
Peter Williams2dd73a42006-06-27 02:54:34 -0700976#endif
Ingo Molnar50e645a2007-07-09 18:52:00 +0200977
Ingo Molnarb29739f2006-06-27 02:54:51 -0700978 int prio, static_prio, normal_prio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 struct list_head run_list;
Ingo Molnar5522d5d2007-10-15 17:00:12 +0200980 const struct sched_class *sched_class;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200981 struct sched_entity se;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
Avi Kivitye107be32007-07-26 13:40:43 +0200983#ifdef CONFIG_PREEMPT_NOTIFIERS
984 /* list of struct preempt_notifier: */
985 struct hlist_head preempt_notifiers;
986#endif
987
Jens Axboe22e2c502005-06-27 10:55:12 +0200988 unsigned short ioprio;
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -0700989#ifdef CONFIG_BLK_DEV_IO_TRACE
Jens Axboe2056a782006-03-23 20:00:26 +0100990 unsigned int btrace_seq;
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -0700991#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992
William Cohen97dc32c2007-05-08 00:23:41 -0700993 unsigned int policy;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 cpumask_t cpus_allowed;
Ingo Molnar50e645a2007-07-09 18:52:00 +0200995 unsigned int time_slice;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700997#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 struct sched_info sched_info;
999#endif
1000
1001 struct list_head tasks;
1002 /*
1003 * ptrace_list/ptrace_children forms the list of my children
1004 * that were stolen by a ptracer.
1005 */
1006 struct list_head ptrace_children;
1007 struct list_head ptrace_list;
1008
1009 struct mm_struct *mm, *active_mm;
1010
1011/* task state */
1012 struct linux_binfmt *binfmt;
William Cohen97dc32c2007-05-08 00:23:41 -07001013 int exit_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 int exit_code, exit_signal;
1015 int pdeath_signal; /* The signal sent when the parent dies */
1016 /* ??? */
William Cohen97dc32c2007-05-08 00:23:41 -07001017 unsigned int personality;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 unsigned did_exec:1;
1019 pid_t pid;
1020 pid_t tgid;
Arjan van de Ven0a4254052006-09-26 10:52:38 +02001021
1022#ifdef CONFIG_CC_STACKPROTECTOR
1023 /* Canary value for the -fstack-protector gcc feature */
1024 unsigned long stack_canary;
1025#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 /*
1027 * pointers to (original) parent process, youngest child, younger sibling,
1028 * older sibling, respectively. (p->father can be replaced with
1029 * p->parent->pid)
1030 */
1031 struct task_struct *real_parent; /* real parent process (when being debugged) */
1032 struct task_struct *parent; /* parent process */
1033 /*
1034 * children/sibling forms the list of my children plus the
1035 * tasks I'm ptracing.
1036 */
1037 struct list_head children; /* list of my children */
1038 struct list_head sibling; /* linkage in my parent's children list */
1039 struct task_struct *group_leader; /* threadgroup leader */
1040
1041 /* PID/PID hash table linkage. */
Eric W. Biederman92476d72006-03-31 02:31:42 -08001042 struct pid_link pids[PIDTYPE_MAX];
Oleg Nesterov47e65322006-03-28 16:11:25 -08001043 struct list_head thread_group;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
1045 struct completion *vfork_done; /* for vfork() */
1046 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1047 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1048
William Cohen97dc32c2007-05-08 00:23:41 -07001049 unsigned int rt_priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 cputime_t utime, stime;
1051 unsigned long nvcsw, nivcsw; /* context switch counts */
Tomas Janousek924b42d2007-07-15 23:39:42 -07001052 struct timespec start_time; /* monotonic time */
1053 struct timespec real_start_time; /* boot based time */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1055 unsigned long min_flt, maj_flt;
1056
1057 cputime_t it_prof_expires, it_virt_expires;
1058 unsigned long long it_sched_expires;
1059 struct list_head cpu_timers[3];
1060
1061/* process credentials */
1062 uid_t uid,euid,suid,fsuid;
1063 gid_t gid,egid,sgid,fsgid;
1064 struct group_info *group_info;
1065 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
1066 unsigned keep_capabilities:1;
1067 struct user_struct *user;
1068#ifdef CONFIG_KEYS
David Howellsb5f545c2006-01-08 01:02:47 -08001069 struct key *request_key_auth; /* assumed request_key authority */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 struct key *thread_keyring; /* keyring private to this thread */
David Howells3e301482005-06-23 22:00:56 -07001071 unsigned char jit_keyring; /* default keyring to attach requested keys to */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072#endif
Arjan van de Vene07e23e2006-09-26 10:52:36 +02001073 /*
1074 * fpu_counter contains the number of consecutive context switches
1075 * that the FPU is used. If this is over a threshold, the lazy fpu
1076 * saving becomes unlazy to save the trap. This is an unsigned char
1077 * so that after 256 times the counter wraps and the behavior turns
1078 * lazy again; this to deal with bursty apps that only use FPU for
1079 * a short time
1080 */
1081 unsigned char fpu_counter;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 int oomkilladj; /* OOM kill score adjustment (bit shift). */
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -07001083 char comm[TASK_COMM_LEN]; /* executable name excluding path
1084 - access with [gs]et_task_comm (which lock
1085 it with task_lock())
1086 - initialized normally by flush_old_exec */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087/* file system info */
1088 int link_count, total_link_count;
Alexey Dobriyan3d5b6fc2006-09-29 01:59:40 -07001089#ifdef CONFIG_SYSVIPC
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090/* ipc stuff */
1091 struct sysv_sem sysvsem;
Alexey Dobriyan3d5b6fc2006-09-29 01:59:40 -07001092#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093/* CPU-specific state of this task */
1094 struct thread_struct thread;
1095/* filesystem information */
1096 struct fs_struct *fs;
1097/* open file information */
1098 struct files_struct *files;
Serge E. Hallyn1651e142006-10-02 02:18:08 -07001099/* namespaces */
Serge E. Hallynab516012006-10-02 02:18:06 -07001100 struct nsproxy *nsproxy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101/* signal handlers */
1102 struct signal_struct *signal;
1103 struct sighand_struct *sighand;
1104
1105 sigset_t blocked, real_blocked;
David Woodhouse150256d2006-01-18 17:43:57 -08001106 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 struct sigpending pending;
1108
1109 unsigned long sas_ss_sp;
1110 size_t sas_ss_size;
1111 int (*notifier)(void *priv);
1112 void *notifier_data;
1113 sigset_t *notifier_mask;
1114
1115 void *security;
1116 struct audit_context *audit_context;
1117 seccomp_t seccomp;
1118
1119/* Thread group tracking */
1120 u32 parent_exec_id;
1121 u32 self_exec_id;
1122/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1123 spinlock_t alloc_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124
Ingo Molnarb29739f2006-06-27 02:54:51 -07001125 /* Protection of the PI data structures: */
1126 spinlock_t pi_lock;
1127
Ingo Molnar23f78d4a2006-06-27 02:54:53 -07001128#ifdef CONFIG_RT_MUTEXES
1129 /* PI waiters blocked on a rt_mutex held by this task */
1130 struct plist_head pi_waiters;
1131 /* Deadlock detection and priority inheritance handling */
1132 struct rt_mutex_waiter *pi_blocked_on;
Ingo Molnar23f78d4a2006-06-27 02:54:53 -07001133#endif
1134
Ingo Molnar408894e2006-01-09 15:59:20 -08001135#ifdef CONFIG_DEBUG_MUTEXES
1136 /* mutex deadlock detection */
1137 struct mutex_waiter *blocked_on;
1138#endif
Ingo Molnarde30a2b2006-07-03 00:24:42 -07001139#ifdef CONFIG_TRACE_IRQFLAGS
1140 unsigned int irq_events;
1141 int hardirqs_enabled;
1142 unsigned long hardirq_enable_ip;
1143 unsigned int hardirq_enable_event;
1144 unsigned long hardirq_disable_ip;
1145 unsigned int hardirq_disable_event;
1146 int softirqs_enabled;
1147 unsigned long softirq_disable_ip;
1148 unsigned int softirq_disable_event;
1149 unsigned long softirq_enable_ip;
1150 unsigned int softirq_enable_event;
1151 int hardirq_context;
1152 int softirq_context;
1153#endif
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001154#ifdef CONFIG_LOCKDEP
1155# define MAX_LOCK_DEPTH 30UL
1156 u64 curr_chain_key;
1157 int lockdep_depth;
1158 struct held_lock held_locks[MAX_LOCK_DEPTH];
1159 unsigned int lockdep_recursion;
1160#endif
Ingo Molnar408894e2006-01-09 15:59:20 -08001161
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162/* journalling filesystem info */
1163 void *journal_info;
1164
Neil Brownd89d8792007-05-01 09:53:42 +02001165/* stacked block device info */
1166 struct bio *bio_list, **bio_tail;
1167
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168/* VM state */
1169 struct reclaim_state *reclaim_state;
1170
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 struct backing_dev_info *backing_dev_info;
1172
1173 struct io_context *io_context;
1174
1175 unsigned long ptrace_message;
1176 siginfo_t *last_siginfo; /* For ptrace use. */
1177/*
1178 * current io wait handle: wait queue entry to use for io waits
1179 * If this thread is processing aio, this points at the waitqueue
1180 * inside the currently handled kiocb. It may be NULL (i.e. default
1181 * to a stack based synchronous wait) if its doing sync IO.
1182 */
1183 wait_queue_t *io_wait;
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001184#ifdef CONFIG_TASK_XACCT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185/* i/o counters(bytes read/written, #syscalls */
1186 u64 rchar, wchar, syscr, syscw;
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001187#endif
Andrew Morton7c3ab732006-12-10 02:19:19 -08001188 struct task_io_accounting ioac;
Jay Lan8f0ab512006-09-30 23:28:59 -07001189#if defined(CONFIG_TASK_XACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 u64 acct_rss_mem1; /* accumulated rss usage */
1191 u64 acct_vm_mem1; /* accumulated virtual memory usage */
Jay Landb5fed262006-09-30 23:29:00 -07001192 cputime_t acct_stimexpd;/* stime since last update */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193#endif
1194#ifdef CONFIG_NUMA
1195 struct mempolicy *mempolicy;
1196 short il_next;
1197#endif
1198#ifdef CONFIG_CPUSETS
1199 struct cpuset *cpuset;
1200 nodemask_t mems_allowed;
1201 int cpuset_mems_generation;
Paul Jackson825a46a2006-03-24 03:16:03 -08001202 int cpuset_mem_spread_rotor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203#endif
Ingo Molnar0771dfe2006-03-27 01:16:22 -08001204 struct robust_list_head __user *robust_list;
Ingo Molnar34f192c2006-03-27 01:16:24 -08001205#ifdef CONFIG_COMPAT
1206 struct compat_robust_list_head __user *compat_robust_list;
1207#endif
Ingo Molnarc87e2832006-06-27 02:54:58 -07001208 struct list_head pi_state_list;
1209 struct futex_pi_state *pi_state_cache;
Ingo Molnar0771dfe2006-03-27 01:16:22 -08001210
Jens Axboe22e2c502005-06-27 10:55:12 +02001211 atomic_t fs_excl; /* holding fs exclusive resources */
Ingo Molnare56d0902006-01-08 01:01:37 -08001212 struct rcu_head rcu;
Jens Axboeb92ce552006-04-11 13:52:07 +02001213
1214 /*
1215 * cache last used pipe for splice
1216 */
1217 struct pipe_inode_info *splice_pipe;
Shailabh Nagarca74e922006-07-14 00:24:36 -07001218#ifdef CONFIG_TASK_DELAY_ACCT
1219 struct task_delay_info *delays;
1220#endif
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001221#ifdef CONFIG_FAULT_INJECTION
1222 int make_it_fail;
1223#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224};
1225
Ingo Molnare05606d2007-07-09 18:51:59 +02001226/*
1227 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1228 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1229 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1230 * values are inverted: lower p->prio value means higher priority.
1231 *
1232 * The MAX_USER_RT_PRIO value allows the actual maximum
1233 * RT priority to be separate from the value exported to
1234 * user-space. This allows kernel threads to set their
1235 * priority to a value higher than any user task. Note:
1236 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1237 */
1238
1239#define MAX_USER_RT_PRIO 100
1240#define MAX_RT_PRIO MAX_USER_RT_PRIO
1241
1242#define MAX_PRIO (MAX_RT_PRIO + 40)
1243#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1244
1245static inline int rt_prio(int prio)
1246{
1247 if (unlikely(prio < MAX_RT_PRIO))
1248 return 1;
1249 return 0;
1250}
1251
1252static inline int rt_task(struct task_struct *p)
1253{
1254 return rt_prio(p->prio);
1255}
1256
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257static inline pid_t process_group(struct task_struct *tsk)
1258{
1259 return tsk->signal->pgrp;
1260}
1261
Cedric Le Goater1ec320a2006-12-08 02:37:55 -08001262static inline pid_t signal_session(struct signal_struct *sig)
1263{
1264 return sig->__session;
1265}
1266
Cedric Le Goater937949d2006-12-08 02:37:54 -08001267static inline pid_t process_session(struct task_struct *tsk)
1268{
Cedric Le Goater1ec320a2006-12-08 02:37:55 -08001269 return signal_session(tsk->signal);
1270}
1271
1272static inline void set_signal_session(struct signal_struct *sig, pid_t session)
1273{
1274 sig->__session = session;
Cedric Le Goater937949d2006-12-08 02:37:54 -08001275}
1276
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001277static inline struct pid *task_pid(struct task_struct *task)
1278{
1279 return task->pids[PIDTYPE_PID].pid;
1280}
1281
1282static inline struct pid *task_tgid(struct task_struct *task)
1283{
1284 return task->group_leader->pids[PIDTYPE_PID].pid;
1285}
1286
1287static inline struct pid *task_pgrp(struct task_struct *task)
1288{
1289 return task->group_leader->pids[PIDTYPE_PGID].pid;
1290}
1291
1292static inline struct pid *task_session(struct task_struct *task)
1293{
1294 return task->group_leader->pids[PIDTYPE_SID].pid;
1295}
1296
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297/**
1298 * pid_alive - check that a task structure is not stale
1299 * @p: Task structure to be checked.
1300 *
1301 * Test if a process is not yet dead (at most zombie state)
1302 * If pid_alive fails, then pointers within the task structure
1303 * can be stale and must not be dereferenced.
1304 */
1305static inline int pid_alive(struct task_struct *p)
1306{
Eric W. Biederman92476d72006-03-31 02:31:42 -08001307 return p->pids[PIDTYPE_PID].pid != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308}
1309
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001310/**
Henne32602592006-10-06 00:44:01 -07001311 * is_init - check if a task structure is init
1312 * @tsk: Task structure to be checked.
1313 *
1314 * Check if a task structure is the first user space task the kernel created.
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001315 */
1316static inline int is_init(struct task_struct *tsk)
1317{
1318 return tsk->pid == 1;
1319}
1320
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001321extern struct pid *cad_pid;
1322
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323extern void free_task(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
Ingo Molnare56d0902006-01-08 01:01:37 -08001325
Andrew Morton158d9eb2006-03-31 02:31:34 -08001326extern void __put_task_struct(struct task_struct *t);
Ingo Molnare56d0902006-01-08 01:01:37 -08001327
1328static inline void put_task_struct(struct task_struct *t)
1329{
1330 if (atomic_dec_and_test(&t->usage))
Eric W. Biederman8c7904a2006-03-31 02:31:37 -08001331 __put_task_struct(t);
Ingo Molnare56d0902006-01-08 01:01:37 -08001332}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333
1334/*
1335 * Per process flags
1336 */
1337#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1338 /* Not implemented yet, only for 486*/
1339#define PF_STARTING 0x00000002 /* being created */
1340#define PF_EXITING 0x00000004 /* getting shut down */
Alexey Kuznetsov778e9a92007-06-08 13:47:00 -07001341#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1343#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1344#define PF_DUMPCORE 0x00000200 /* dumped core */
1345#define PF_SIGNALED 0x00000400 /* killed by a signal */
1346#define PF_MEMALLOC 0x00000800 /* Allocating memory */
1347#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1348#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1350#define PF_FROZEN 0x00010000 /* frozen for system suspend */
1351#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1352#define PF_KSWAPD 0x00040000 /* I am kswapd */
1353#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1354#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
Jens Axboeb31dc662006-06-13 08:26:10 +02001355#define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1356#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1357#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1358#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1359#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
Paul Jacksonc61afb12006-03-24 03:16:08 -08001360#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
Thomas Gleixner61a87122006-06-27 02:54:56 -07001361#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
Rafael J. Wysockiba96a0c2007-05-23 13:57:25 -07001362#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363
1364/*
1365 * Only the _current_ task can read/write to tsk->flags, but other
1366 * tasks can access tsk->flags in readonly mode for example
1367 * with tsk_used_math (like during threaded core dumping).
1368 * There is however an exception to this rule during ptrace
1369 * or during fork: the ptracer task is allowed to write to the
1370 * child->flags of its traced child (same goes for fork, the parent
1371 * can write to the child->flags), because we're guaranteed the
1372 * child is not running and in turn not changing child->flags
1373 * at the same time the parent does it.
1374 */
1375#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1376#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1377#define clear_used_math() clear_stopped_child_used_math(current)
1378#define set_used_math() set_stopped_child_used_math(current)
1379#define conditional_stopped_child_used_math(condition, child) \
1380 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1381#define conditional_used_math(condition) \
1382 conditional_stopped_child_used_math(condition, current)
1383#define copy_to_stopped_child_used_math(child) \
1384 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1385/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1386#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1387#define used_math() tsk_used_math(current)
1388
1389#ifdef CONFIG_SMP
Ingo Molnar36c8b582006-07-03 00:25:41 -07001390extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391#else
Ingo Molnar36c8b582006-07-03 00:25:41 -07001392static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393{
Paul Jackson4098f992005-10-30 15:03:21 -08001394 if (!cpu_isset(0, new_mask))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 return -EINVAL;
1396 return 0;
1397}
1398#endif
1399
1400extern unsigned long long sched_clock(void);
Ingo Molnare436d802007-07-19 21:28:35 +02001401
1402/*
1403 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1404 * clock constructed from sched_clock():
1405 */
1406extern unsigned long long cpu_clock(int cpu);
1407
Ingo Molnar36c8b582006-07-03 00:25:41 -07001408extern unsigned long long
Ingo Molnar41b86e92007-07-09 18:51:58 +02001409task_sched_runtime(struct task_struct *task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410
1411/* sched_exec is called by processes performing an exec */
1412#ifdef CONFIG_SMP
1413extern void sched_exec(void);
1414#else
1415#define sched_exec() {}
1416#endif
1417
Ingo Molnar2aa44d02007-08-23 15:18:02 +02001418extern void sched_clock_idle_sleep_event(void);
1419extern void sched_clock_idle_wakeup_event(u64 delta_ns);
Ingo Molnarbb29ab22007-07-09 18:51:59 +02001420
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421#ifdef CONFIG_HOTPLUG_CPU
1422extern void idle_task_exit(void);
1423#else
1424static inline void idle_task_exit(void) {}
1425#endif
1426
1427extern void sched_idle_next(void);
Ingo Molnarb29739f2006-06-27 02:54:51 -07001428
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001429#ifdef CONFIG_SCHED_DEBUG
Peter Zijlstra21805082007-08-25 18:41:53 +02001430extern unsigned int sysctl_sched_latency;
Peter Zijlstra5f6d858e2007-10-15 17:00:12 +02001431extern unsigned int sysctl_sched_nr_latency;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001432extern unsigned int sysctl_sched_wakeup_granularity;
1433extern unsigned int sysctl_sched_batch_wakeup_granularity;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001434extern unsigned int sysctl_sched_child_runs_first;
1435extern unsigned int sysctl_sched_features;
Ingo Molnarda84d962007-10-15 17:00:18 +02001436extern unsigned int sysctl_sched_migration_cost;
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001437#endif
1438
1439extern unsigned int sysctl_sched_compat_yield;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001440
Ingo Molnarb29739f2006-06-27 02:54:51 -07001441#ifdef CONFIG_RT_MUTEXES
Ingo Molnar36c8b582006-07-03 00:25:41 -07001442extern int rt_mutex_getprio(struct task_struct *p);
1443extern void rt_mutex_setprio(struct task_struct *p, int prio);
1444extern void rt_mutex_adjust_pi(struct task_struct *p);
Ingo Molnarb29739f2006-06-27 02:54:51 -07001445#else
Ingo Molnar36c8b582006-07-03 00:25:41 -07001446static inline int rt_mutex_getprio(struct task_struct *p)
Ingo Molnarb29739f2006-06-27 02:54:51 -07001447{
1448 return p->normal_prio;
1449}
Thomas Gleixner95e02ca2006-06-27 02:55:02 -07001450# define rt_mutex_adjust_pi(p) do { } while (0)
Ingo Molnarb29739f2006-06-27 02:54:51 -07001451#endif
1452
Ingo Molnar36c8b582006-07-03 00:25:41 -07001453extern void set_user_nice(struct task_struct *p, long nice);
1454extern int task_prio(const struct task_struct *p);
1455extern int task_nice(const struct task_struct *p);
1456extern int can_nice(const struct task_struct *p, const int nice);
1457extern int task_curr(const struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458extern int idle_cpu(int cpu);
1459extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
Ingo Molnar36c8b582006-07-03 00:25:41 -07001460extern struct task_struct *idle_task(int cpu);
1461extern struct task_struct *curr_task(int cpu);
1462extern void set_curr_task(int cpu, struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463
1464void yield(void);
1465
1466/*
1467 * The default (Linux) execution domain.
1468 */
1469extern struct exec_domain default_exec_domain;
1470
1471union thread_union {
1472 struct thread_info thread_info;
1473 unsigned long stack[THREAD_SIZE/sizeof(long)];
1474};
1475
1476#ifndef __HAVE_ARCH_KSTACK_END
1477static inline int kstack_end(void *addr)
1478{
1479 /* Reliable end of stack detection:
1480 * Some APM bios versions misalign the stack
1481 */
1482 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1483}
1484#endif
1485
1486extern union thread_union init_thread_union;
1487extern struct task_struct init_task;
1488
1489extern struct mm_struct init_mm;
1490
1491#define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1492extern struct task_struct *find_task_by_pid_type(int type, int pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493extern void __set_special_pids(pid_t session, pid_t pgrp);
1494
1495/* per-UID process charging. */
Cedric Le Goateracce2922007-07-15 23:40:59 -07001496extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497static inline struct user_struct *get_uid(struct user_struct *u)
1498{
1499 atomic_inc(&u->__count);
1500 return u;
1501}
1502extern void free_uid(struct user_struct *);
1503extern void switch_uid(struct user_struct *);
Pavel Emelyanov28f300d2007-09-18 22:46:45 -07001504extern void release_uids(struct user_namespace *ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505
1506#include <asm/current.h>
1507
Atsushi Nemoto3171a032006-09-29 02:00:32 -07001508extern void do_timer(unsigned long ticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509
1510extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
1511extern int FASTCALL(wake_up_process(struct task_struct * tsk));
1512extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
1513 unsigned long clone_flags));
1514#ifdef CONFIG_SMP
1515 extern void kick_process(struct task_struct *tsk);
1516#else
1517 static inline void kick_process(struct task_struct *tsk) { }
1518#endif
Ingo Molnarad46c2c2007-07-09 18:52:00 +02001519extern void sched_fork(struct task_struct *p, int clone_flags);
1520extern void sched_dead(struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521
1522extern int in_group_p(gid_t);
1523extern int in_egroup_p(gid_t);
1524
1525extern void proc_caches_init(void);
1526extern void flush_signals(struct task_struct *);
Oleg Nesterov10ab8252007-05-09 02:34:37 -07001527extern void ignore_signals(struct task_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528extern void flush_signal_handlers(struct task_struct *, int force_default);
1529extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1530
1531static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1532{
1533 unsigned long flags;
1534 int ret;
1535
1536 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1537 ret = dequeue_signal(tsk, mask, info);
1538 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1539
1540 return ret;
1541}
1542
1543extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1544 sigset_t *mask);
1545extern void unblock_all_signals(void);
1546extern void release_task(struct task_struct * p);
1547extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1548extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
1549extern int force_sigsegv(int, struct task_struct *);
1550extern int force_sig_info(int, struct siginfo *, struct task_struct *);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001551extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1552extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1553extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
Eric W. Biederman2425c082006-10-02 02:17:28 -07001554extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001555extern int kill_pgrp(struct pid *pid, int sig, int priv);
1556extern int kill_pid(struct pid *pid, int sig, int priv);
Matthew Wilcoxc3de4b32007-02-09 08:11:47 -07001557extern int kill_proc_info(int, struct siginfo *, pid_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558extern void do_notify_parent(struct task_struct *, int);
1559extern void force_sig(int, struct task_struct *);
1560extern void force_sig_specific(int, struct task_struct *);
1561extern int send_sig(int, struct task_struct *, int);
1562extern void zap_other_threads(struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563extern int kill_proc(pid_t, int, int);
1564extern struct sigqueue *sigqueue_alloc(void);
1565extern void sigqueue_free(struct sigqueue *);
1566extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
1567extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
Oleg Nesterov9ac95f22006-02-09 22:41:50 +03001568extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1570
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001571static inline int kill_cad_pid(int sig, int priv)
1572{
1573 return kill_pid(cad_pid, sig, priv);
1574}
1575
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576/* These can be the second arg to send_sig_info/send_group_sig_info. */
1577#define SEND_SIG_NOINFO ((struct siginfo *) 0)
1578#define SEND_SIG_PRIV ((struct siginfo *) 1)
1579#define SEND_SIG_FORCED ((struct siginfo *) 2)
1580
Oleg Nesterov621d3122005-10-30 15:03:45 -08001581static inline int is_si_special(const struct siginfo *info)
1582{
1583 return info <= SEND_SIG_FORCED;
1584}
1585
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586/* True if we are on the alternate signal stack. */
1587
1588static inline int on_sig_stack(unsigned long sp)
1589{
1590 return (sp - current->sas_ss_sp < current->sas_ss_size);
1591}
1592
1593static inline int sas_ss_flags(unsigned long sp)
1594{
1595 return (current->sas_ss_size == 0 ? SS_DISABLE
1596 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1597}
1598
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599/*
1600 * Routines for handling mm_structs
1601 */
1602extern struct mm_struct * mm_alloc(void);
1603
1604/* mmdrop drops the mm and the page tables */
1605extern void FASTCALL(__mmdrop(struct mm_struct *));
1606static inline void mmdrop(struct mm_struct * mm)
1607{
Ingo Molnar6fb43d72007-07-09 18:52:01 +02001608 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609 __mmdrop(mm);
1610}
1611
1612/* mmput gets rid of the mappings and all user-space */
1613extern void mmput(struct mm_struct *);
1614/* Grab a reference to a task's mm, if it is not already going away */
1615extern struct mm_struct *get_task_mm(struct task_struct *task);
1616/* Remove the current tasks stale references to the old mm_struct */
1617extern void mm_release(struct task_struct *, struct mm_struct *);
1618
1619extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1620extern void flush_thread(void);
1621extern void exit_thread(void);
1622
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623extern void exit_files(struct task_struct *);
Oleg Nesterov6b3934e2006-03-28 16:11:16 -08001624extern void __cleanup_signal(struct signal_struct *);
Oleg Nesterova7e53282006-03-28 16:11:27 -08001625extern void __cleanup_sighand(struct sighand_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626extern void exit_itimers(struct signal_struct *);
1627
1628extern NORET_TYPE void do_group_exit(int);
1629
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630extern void daemonize(const char *, ...);
1631extern int allow_signal(int);
1632extern int disallow_signal(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633
1634extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1635extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
Ingo Molnar36c8b582006-07-03 00:25:41 -07001636struct task_struct *fork_idle(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637
1638extern void set_task_comm(struct task_struct *tsk, char *from);
1639extern void get_task_comm(char *to, struct task_struct *tsk);
1640
1641#ifdef CONFIG_SMP
Ingo Molnar36c8b582006-07-03 00:25:41 -07001642extern void wait_task_inactive(struct task_struct * p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643#else
1644#define wait_task_inactive(p) do { } while (0)
1645#endif
1646
1647#define remove_parent(p) list_del_init(&(p)->sibling)
Oleg Nesterov8fafabd2006-03-28 16:11:05 -08001648#define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649
Eric W. Biederman5e85d4a2006-04-18 22:20:16 -07001650#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651
1652#define for_each_process(p) \
1653 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1654
1655/*
1656 * Careful: do_each_thread/while_each_thread is a double loop so
1657 * 'break' will not work as expected - use goto instead.
1658 */
1659#define do_each_thread(g, t) \
1660 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1661
1662#define while_each_thread(g, t) \
1663 while ((t = next_thread(t)) != g)
1664
Eric W. Biedermande12a782006-04-10 17:16:49 -06001665/* de_thread depends on thread_group_leader not being a pid based check */
1666#define thread_group_leader(p) (p == p->group_leader)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667
Eric W. Biederman0804ef42006-10-02 02:17:04 -07001668/* Do to the insanities of de_thread it is possible for a process
1669 * to have the pid of the thread group leader without actually being
1670 * the thread group leader. For iteration through the pids in proc
1671 * all we care about is that we have a task with the appropriate
1672 * pid, we don't actually care if we have the right task.
1673 */
1674static inline int has_group_leader_pid(struct task_struct *p)
1675{
1676 return p->pid == p->tgid;
1677}
1678
Ingo Molnar36c8b582006-07-03 00:25:41 -07001679static inline struct task_struct *next_thread(const struct task_struct *p)
Oleg Nesterov47e65322006-03-28 16:11:25 -08001680{
1681 return list_entry(rcu_dereference(p->thread_group.next),
Ingo Molnar36c8b582006-07-03 00:25:41 -07001682 struct task_struct, thread_group);
Oleg Nesterov47e65322006-03-28 16:11:25 -08001683}
1684
Ingo Molnar36c8b582006-07-03 00:25:41 -07001685static inline int thread_group_empty(struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686{
Oleg Nesterov47e65322006-03-28 16:11:25 -08001687 return list_empty(&p->thread_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688}
1689
1690#define delay_group_leader(p) \
1691 (thread_group_leader(p) && !thread_group_empty(p))
1692
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693/*
Eric W. Biederman260ea102006-06-23 02:05:18 -07001694 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
Jens Axboe22e2c502005-06-27 10:55:12 +02001695 * subscriptions and synchronises with wait4(). Also used in procfs. Also
Paul Jackson053199e2005-10-30 15:02:30 -08001696 * pins the final release of task.io_context. Also protects ->cpuset.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 *
1698 * Nests both inside and outside of read_lock(&tasklist_lock).
1699 * It must not be nested with write_lock_irq(&tasklist_lock),
1700 * neither inside nor outside.
1701 */
1702static inline void task_lock(struct task_struct *p)
1703{
1704 spin_lock(&p->alloc_lock);
1705}
1706
1707static inline void task_unlock(struct task_struct *p)
1708{
1709 spin_unlock(&p->alloc_lock);
1710}
1711
Oleg Nesterovf63ee722006-03-28 16:11:13 -08001712extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1713 unsigned long *flags);
1714
1715static inline void unlock_task_sighand(struct task_struct *tsk,
1716 unsigned long *flags)
1717{
1718 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1719}
1720
Al Virof0373602005-11-13 16:06:57 -08001721#ifndef __HAVE_THREAD_FUNCTIONS
1722
Roman Zippelf7e42172007-05-09 02:35:17 -07001723#define task_thread_info(task) ((struct thread_info *)(task)->stack)
1724#define task_stack_page(task) ((task)->stack)
Al Viroa1261f52005-11-13 16:06:55 -08001725
Al Viro10ebffd2005-11-13 16:06:56 -08001726static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1727{
1728 *task_thread_info(p) = *task_thread_info(org);
1729 task_thread_info(p)->task = p;
1730}
1731
1732static inline unsigned long *end_of_stack(struct task_struct *p)
1733{
Roman Zippelf7e42172007-05-09 02:35:17 -07001734 return (unsigned long *)(task_thread_info(p) + 1);
Al Viro10ebffd2005-11-13 16:06:56 -08001735}
1736
Al Virof0373602005-11-13 16:06:57 -08001737#endif
1738
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739/* set thread flags in other task's structures
1740 * - see asm/thread_info.h for TIF_xxxx flags available
1741 */
1742static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1743{
Al Viroa1261f52005-11-13 16:06:55 -08001744 set_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745}
1746
1747static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1748{
Al Viroa1261f52005-11-13 16:06:55 -08001749 clear_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750}
1751
1752static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1753{
Al Viroa1261f52005-11-13 16:06:55 -08001754 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755}
1756
1757static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1758{
Al Viroa1261f52005-11-13 16:06:55 -08001759 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760}
1761
1762static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1763{
Al Viroa1261f52005-11-13 16:06:55 -08001764 return test_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765}
1766
1767static inline void set_tsk_need_resched(struct task_struct *tsk)
1768{
1769 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1770}
1771
1772static inline void clear_tsk_need_resched(struct task_struct *tsk)
1773{
1774 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1775}
1776
1777static inline int signal_pending(struct task_struct *p)
1778{
1779 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1780}
1781
1782static inline int need_resched(void)
1783{
1784 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1785}
1786
1787/*
1788 * cond_resched() and cond_resched_lock(): latency reduction via
1789 * explicit rescheduling in places that are safe. The return
1790 * value indicates whether a reschedule was done in fact.
1791 * cond_resched_lock() will drop the spinlock before scheduling,
1792 * cond_resched_softirq() will enable bhs before scheduling.
1793 */
1794extern int cond_resched(void);
1795extern int cond_resched_lock(spinlock_t * lock);
1796extern int cond_resched_softirq(void);
1797
1798/*
1799 * Does a critical section need to be broken due to another
1800 * task waiting?:
1801 */
1802#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1803# define need_lockbreak(lock) ((lock)->break_lock)
1804#else
1805# define need_lockbreak(lock) 0
1806#endif
1807
1808/*
1809 * Does a critical section need to be broken due to another
1810 * task waiting or preemption being signalled:
1811 */
1812static inline int lock_need_resched(spinlock_t *lock)
1813{
1814 if (need_lockbreak(lock) || need_resched())
1815 return 1;
1816 return 0;
1817}
1818
Roland McGrath7bb44ad2007-05-23 13:57:44 -07001819/*
1820 * Reevaluate whether the task has signals pending delivery.
1821 * Wake the task if so.
1822 * This is required every time the blocked sigset_t changes.
1823 * callers must hold sighand->siglock.
1824 */
1825extern void recalc_sigpending_and_wake(struct task_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826extern void recalc_sigpending(void);
1827
1828extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1829
1830/*
1831 * Wrappers for p->thread_info->cpu access. No-op on UP.
1832 */
1833#ifdef CONFIG_SMP
1834
1835static inline unsigned int task_cpu(const struct task_struct *p)
1836{
Al Viroa1261f52005-11-13 16:06:55 -08001837 return task_thread_info(p)->cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838}
1839
Ingo Molnarc65cc872007-07-09 18:51:58 +02001840extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841
1842#else
1843
1844static inline unsigned int task_cpu(const struct task_struct *p)
1845{
1846 return 0;
1847}
1848
1849static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1850{
1851}
1852
1853#endif /* CONFIG_SMP */
1854
1855#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1856extern void arch_pick_mmap_layout(struct mm_struct *mm);
1857#else
1858static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1859{
1860 mm->mmap_base = TASK_UNMAPPED_BASE;
1861 mm->get_unmapped_area = arch_get_unmapped_area;
1862 mm->unmap_area = arch_unmap_area;
1863}
1864#endif
1865
1866extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1867extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1868
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -07001869extern int sched_mc_power_savings, sched_smt_power_savings;
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -07001870
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871extern void normalize_rt_tasks(void);
1872
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02001873#ifdef CONFIG_FAIR_GROUP_SCHED
1874
Ingo Molnar4cf86d72007-10-15 17:00:14 +02001875extern struct task_group init_task_group;
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02001876
Ingo Molnar4cf86d72007-10-15 17:00:14 +02001877extern struct task_group *sched_create_group(void);
1878extern void sched_destroy_group(struct task_group *tg);
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02001879extern void sched_move_task(struct task_struct *tsk);
Ingo Molnar4cf86d72007-10-15 17:00:14 +02001880extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
Dhaval Giani5cb350b2007-10-15 17:00:14 +02001881extern unsigned long sched_group_shares(struct task_group *tg);
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +02001882
1883#endif
1884
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001885#ifdef CONFIG_TASK_XACCT
1886static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
1887{
1888 tsk->rchar += amt;
1889}
1890
1891static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
1892{
1893 tsk->wchar += amt;
1894}
1895
1896static inline void inc_syscr(struct task_struct *tsk)
1897{
1898 tsk->syscr++;
1899}
1900
1901static inline void inc_syscw(struct task_struct *tsk)
1902{
1903 tsk->syscw++;
1904}
1905#else
1906static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
1907{
1908}
1909
1910static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
1911{
1912}
1913
1914static inline void inc_syscr(struct task_struct *tsk)
1915{
1916}
1917
1918static inline void inc_syscw(struct task_struct *tsk)
1919{
1920}
1921#endif
1922
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923#endif /* __KERNEL__ */
1924
1925#endif