blob: 66169005f008c2c5c50b0891671bed2c7f9135f7 [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>
David Woodhousea3b67142006-04-25 14:54:40 +010090
91#include <asm/processor.h>
H. J. Lu36d57ac2005-09-06 15:16:49 -070092
Linus Torvalds1da177e2005-04-16 15:20:36 -070093struct exec_domain;
Ingo Molnarc87e2832006-06-27 02:54:58 -070094struct futex_pi_state;
Neil Brownd89d8792007-05-01 09:53:42 +020095struct bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 * List of flags we want to share for kernel threads,
99 * if only because they are not used by them anyway.
100 */
101#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
102
103/*
104 * These are the constant used to fake the fixed-point load-average
105 * counting. Some notes:
106 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
107 * a load-average precision of 10 bits integer + 11 bits fractional
108 * - if you want to count load-averages more often, you need more
109 * precision, or rounding will get you. With 2-second counting freq,
110 * the EXP_n values would be 1981, 2034 and 2043 if still using only
111 * 11 bit fractions.
112 */
113extern unsigned long avenrun[]; /* Load averages */
114
115#define FSHIFT 11 /* nr of bits of precision */
116#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
Linus Torvalds0c2043a2007-10-07 16:17:38 -0700117#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
119#define EXP_5 2014 /* 1/exp(5sec/5min) */
120#define EXP_15 2037 /* 1/exp(5sec/15min) */
121
122#define CALC_LOAD(load,exp,n) \
123 load *= exp; \
124 load += n*(FIXED_1-exp); \
125 load >>= FSHIFT;
126
127extern unsigned long total_forks;
128extern int nr_threads;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129DECLARE_PER_CPU(unsigned long, process_counts);
130extern int nr_processes(void);
131extern unsigned long nr_running(void);
132extern unsigned long nr_uninterruptible(void);
Jack Steinerdb1b1fe2006-03-31 02:31:21 -0800133extern unsigned long nr_active(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134extern unsigned long nr_iowait(void);
Peter Williams2dd73a42006-06-27 02:54:34 -0700135extern unsigned long weighted_cpuload(const int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200137struct seq_file;
138struct cfs_rq;
139#ifdef CONFIG_SCHED_DEBUG
140extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
141extern void proc_sched_set_task(struct task_struct *p);
142extern void
Ingo Molnar5cef9ec2007-08-09 11:16:47 +0200143print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200144#else
145static inline void
146proc_sched_show_task(struct task_struct *p, struct seq_file *m)
147{
148}
149static inline void proc_sched_set_task(struct task_struct *p)
150{
151}
152static inline void
Ingo Molnar5cef9ec2007-08-09 11:16:47 +0200153print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
Ingo Molnar43ae34c2007-07-09 18:52:00 +0200154{
155}
156#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Linus Torvalds4a8342d2005-09-29 15:18:21 -0700158/*
159 * Task state bitmask. NOTE! These bits are also
160 * encoded in fs/proc/array.c: get_task_state().
161 *
162 * We have two separate sets of flags: task->state
163 * is about runnability, while task->exit_state are
164 * about the task exiting. Confusing, but this way
165 * modifying one set can't modify the other one by
166 * mistake.
167 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168#define TASK_RUNNING 0
169#define TASK_INTERRUPTIBLE 1
170#define TASK_UNINTERRUPTIBLE 2
Linus Torvalds4a8342d2005-09-29 15:18:21 -0700171#define TASK_STOPPED 4
172#define TASK_TRACED 8
173/* in tsk->exit_state */
174#define EXIT_ZOMBIE 16
175#define EXIT_DEAD 32
176/* in tsk->state again */
177#define TASK_NONINTERACTIVE 64
Oleg Nesterovc394cc92006-09-29 02:01:11 -0700178#define TASK_DEAD 128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180#define __set_task_state(tsk, state_value) \
181 do { (tsk)->state = (state_value); } while (0)
182#define set_task_state(tsk, state_value) \
183 set_mb((tsk)->state, (state_value))
184
Andrew Morton498d0c52005-09-13 01:25:14 -0700185/*
186 * set_current_state() includes a barrier so that the write of current->state
187 * is correctly serialised wrt the caller's subsequent test of whether to
188 * actually sleep:
189 *
190 * set_current_state(TASK_UNINTERRUPTIBLE);
191 * if (do_i_need_to_sleep())
192 * schedule();
193 *
194 * If the caller does not need such serialisation then use __set_current_state()
195 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196#define __set_current_state(state_value) \
197 do { current->state = (state_value); } while (0)
198#define set_current_state(state_value) \
199 set_mb(current->state, (state_value))
200
201/* Task command name length */
202#define TASK_COMM_LEN 16
203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204#include <linux/spinlock.h>
205
206/*
207 * This serializes "schedule()" and also protects
208 * the run-queue from deletions/modifications (but
209 * _adding_ to the beginning of the run-queue has
210 * a separate lock).
211 */
212extern rwlock_t tasklist_lock;
213extern spinlock_t mmlist_lock;
214
Ingo Molnar36c8b582006-07-03 00:25:41 -0700215struct task_struct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
217extern void sched_init(void);
218extern void sched_init_smp(void);
Ingo Molnar36c8b582006-07-03 00:25:41 -0700219extern void init_idle(struct task_struct *idle, int cpu);
Ingo Molnar1df21052007-07-09 18:51:58 +0200220extern void init_idle_bootup_task(struct task_struct *idle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
222extern cpumask_t nohz_cpu_mask;
Siddha, Suresh B46cb4b72007-05-08 00:32:51 -0700223#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
224extern int select_nohz_load_balancer(int cpu);
225#else
226static inline int select_nohz_load_balancer(int cpu)
227{
228 return 0;
229}
230#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800232/*
Ingo Molnar39bc89f2007-04-25 20:50:03 -0700233 * Only dump TASK_* tasks. (0 for all tasks)
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800234 */
235extern void show_state_filter(unsigned long state_filter);
236
237static inline void show_state(void)
238{
Ingo Molnar39bc89f2007-04-25 20:50:03 -0700239 show_state_filter(0);
Ingo Molnare59e2ae2006-12-06 20:35:59 -0800240}
241
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242extern void show_regs(struct pt_regs *);
243
244/*
245 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
246 * task), SP is the stack pointer of the first frame that should be shown in the back
247 * trace (or NULL if the entire call-chain of the task should be shown).
248 */
249extern void show_stack(struct task_struct *task, unsigned long *sp);
250
251void io_schedule(void);
252long io_schedule_timeout(long timeout);
253
254extern void cpu_init (void);
255extern void trap_init(void);
256extern void update_process_times(int user);
257extern void scheduler_tick(void);
258
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700259#ifdef CONFIG_DETECT_SOFTLOCKUP
Ingo Molnar6687a972006-03-24 03:18:41 -0800260extern void softlockup_tick(void);
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700261extern void spawn_softlockup_task(void);
262extern void touch_softlockup_watchdog(void);
Jeremy Fitzhardinge04c91672007-05-08 00:28:05 -0700263extern void touch_all_softlockup_watchdogs(void);
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700264#else
Ingo Molnar6687a972006-03-24 03:18:41 -0800265static inline void softlockup_tick(void)
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700266{
267}
268static inline void spawn_softlockup_task(void)
269{
270}
271static inline void touch_softlockup_watchdog(void)
272{
273}
Jeremy Fitzhardinge04c91672007-05-08 00:28:05 -0700274static inline void touch_all_softlockup_watchdogs(void)
275{
276}
Ingo Molnar8446f1d2005-09-06 15:16:27 -0700277#endif
278
279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280/* Attach to any functions which should be ignored in wchan output. */
281#define __sched __attribute__((__section__(".sched.text")))
282/* Is this address in the __sched functions? */
283extern int in_sched_functions(unsigned long addr);
284
285#define MAX_SCHEDULE_TIMEOUT LONG_MAX
286extern signed long FASTCALL(schedule_timeout(signed long timeout));
Nishanth Aravamudan64ed93a2005-09-10 00:27:21 -0700287extern signed long schedule_timeout_interruptible(signed long timeout);
288extern signed long schedule_timeout_uninterruptible(signed long timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289asmlinkage void schedule(void);
290
Serge E. Hallynab516012006-10-02 02:18:06 -0700291struct nsproxy;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700292struct user_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
294/* Maximum number of active map areas.. This is a random (large) number */
295#define DEFAULT_MAX_MAP_COUNT 65536
296
297extern int sysctl_max_map_count;
298
299#include <linux/aio.h>
300
301extern unsigned long
302arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
303 unsigned long, unsigned long);
304extern unsigned long
305arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
306 unsigned long len, unsigned long pgoff,
307 unsigned long flags);
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700308extern void arch_unmap_area(struct mm_struct *, unsigned long);
309extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700311#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
312/*
313 * The mm counters are not protected by its page_table_lock,
314 * so must be incremented atomically.
315 */
Christoph Lameterd3cb4872006-01-06 00:11:20 -0800316#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
317#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
318#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
319#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
320#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
321typedef atomic_long_t mm_counter_t;
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700322
323#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
324/*
325 * The mm counters are protected by its page_table_lock,
326 * so can be incremented directly.
327 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
329#define get_mm_counter(mm, member) ((mm)->_##member)
330#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
331#define inc_mm_counter(mm, member) (mm)->_##member++
332#define dec_mm_counter(mm, member) (mm)->_##member--
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700333typedef unsigned long mm_counter_t;
Hugh Dickins42946212005-10-29 18:16:05 -0700334
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700335#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
336
337#define get_mm_rss(mm) \
338 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
Hugh Dickins365e9c872005-10-29 18:16:18 -0700339#define update_hiwater_rss(mm) do { \
340 unsigned long _rss = get_mm_rss(mm); \
341 if ((mm)->hiwater_rss < _rss) \
342 (mm)->hiwater_rss = _rss; \
343} while (0)
344#define update_hiwater_vm(mm) do { \
345 if ((mm)->hiwater_vm < (mm)->total_vm) \
346 (mm)->hiwater_vm = (mm)->total_vm; \
347} while (0)
348
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700349extern void set_dumpable(struct mm_struct *mm, int value);
350extern int get_dumpable(struct mm_struct *mm);
351
352/* mm flags */
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700353/* dumpable bits */
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700354#define MMF_DUMPABLE 0 /* core dump is permitted */
355#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -0700356#define MMF_DUMPABLE_BITS 2
357
358/* coredump filter bits */
359#define MMF_DUMP_ANON_PRIVATE 2
360#define MMF_DUMP_ANON_SHARED 3
361#define MMF_DUMP_MAPPED_PRIVATE 4
362#define MMF_DUMP_MAPPED_SHARED 5
363#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
364#define MMF_DUMP_FILTER_BITS 4
365#define MMF_DUMP_FILTER_MASK \
366 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
367#define MMF_DUMP_FILTER_DEFAULT \
368 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700369
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370struct mm_struct {
371 struct vm_area_struct * mmap; /* list of VMAs */
372 struct rb_root mm_rb;
373 struct vm_area_struct * mmap_cache; /* last find_vma result */
374 unsigned long (*get_unmapped_area) (struct file *filp,
375 unsigned long addr, unsigned long len,
376 unsigned long pgoff, unsigned long flags);
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700377 void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
Benjamin Herrenschmidt0551fbd2006-02-28 16:59:19 -0800378 unsigned long mmap_base; /* base of mmap area */
379 unsigned long task_size; /* size of task vm space */
380 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700381 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 pgd_t * pgd;
383 atomic_t mm_users; /* How many users with user space? */
384 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
385 int map_count; /* number of VMAs */
386 struct rw_semaphore mmap_sem;
387 spinlock_t page_table_lock; /* Protects page tables and some counters */
388
389 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
390 * together off init_mm.mmlist, and are protected
391 * by mmlist_lock
392 */
393
Hugh Dickinsf412ac02005-10-29 18:16:41 -0700394 /* Special counters, in some configurations protected by the
395 * page_table_lock, in other configurations by being atomic.
396 */
Hugh Dickins42946212005-10-29 18:16:05 -0700397 mm_counter_t _file_rss;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 mm_counter_t _anon_rss;
399
Hugh Dickinsf4499522005-10-29 18:16:19 -0700400 unsigned long hiwater_rss; /* High-watermark of RSS usage */
401 unsigned long hiwater_vm; /* High-water virtual memory usage */
402
403 unsigned long total_vm, locked_vm, shared_vm, exec_vm;
404 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
405 unsigned long start_code, end_code, start_data, end_data;
406 unsigned long start_brk, brk, start_stack;
407 unsigned long arg_start, arg_end, env_start, env_end;
408
H. J. Lu36d57ac2005-09-06 15:16:49 -0700409 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 cpumask_t cpu_vm_mask;
412
413 /* Architecture-specific MM context */
414 mm_context_t context;
415
Ashwin Chaugule7602bdf2006-12-06 20:31:57 -0800416 /* Swap token stuff */
417 /*
418 * Last value of global fault stamp as seen by this process.
419 * In other words, this value gives an indication of how long
420 * it has been since this task got the token.
421 * Look at mm/thrash.c
422 */
423 unsigned int faultstamp;
424 unsigned int token_priority;
425 unsigned int last_interval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -0700427 unsigned long flags; /* Must use atomic bitops to access the bits */
Arnaldo Carvalho de Melo36de6432006-12-06 20:33:42 -0800428
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 /* coredumping support */
430 int core_waiters;
431 struct completion *core_startup_done, core_done;
432
433 /* aio bits */
434 rwlock_t ioctx_list_lock;
435 struct kioctx *ioctx_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436};
437
438struct sighand_struct {
439 atomic_t count;
440 struct k_sigaction action[_NSIG];
441 spinlock_t siglock;
Davide Libenzib8fceee2007-09-20 12:40:16 -0700442 wait_queue_head_t signalfd_wqh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443};
444
KaiGai Kohei0e464812006-06-25 05:49:24 -0700445struct pacct_struct {
KaiGai Koheif6ec29a2006-06-25 05:49:25 -0700446 int ac_flag;
447 long ac_exitcode;
KaiGai Kohei0e464812006-06-25 05:49:24 -0700448 unsigned long ac_mem;
KaiGai Kohei77787bf2006-06-25 05:49:26 -0700449 cputime_t ac_utime, ac_stime;
450 unsigned long ac_minflt, ac_majflt;
KaiGai Kohei0e464812006-06-25 05:49:24 -0700451};
452
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453/*
454 * NOTE! "signal_struct" does not have it's own
455 * locking, because a shared signal_struct always
456 * implies a shared sighand_struct, so locking
457 * sighand_struct is always a proper superset of
458 * the locking of signal_struct.
459 */
460struct signal_struct {
461 atomic_t count;
462 atomic_t live;
463
464 wait_queue_head_t wait_chldexit; /* for wait4() */
465
466 /* current thread group signal load-balancing target: */
Ingo Molnar36c8b582006-07-03 00:25:41 -0700467 struct task_struct *curr_target;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
469 /* shared signal handling: */
470 struct sigpending shared_pending;
471
472 /* thread group exit support */
473 int group_exit_code;
474 /* overloaded:
475 * - notify group_exit_task when ->count is equal to notify_count
476 * - everyone except group_exit_task is stopped during signal delivery
477 * of fatal signals, group_exit_task processes the signal.
478 */
479 struct task_struct *group_exit_task;
480 int notify_count;
481
482 /* thread group stop support, overloads group_exit_code too */
483 int group_stop_count;
484 unsigned int flags; /* see SIGNAL_* flags below */
485
486 /* POSIX.1b Interval Timers */
487 struct list_head posix_timers;
488
489 /* ITIMER_REAL timer for the process */
Thomas Gleixner2ff678b2006-01-09 20:52:34 -0800490 struct hrtimer real_timer;
Roman Zippel05cfb612006-03-26 01:38:12 -0800491 struct task_struct *tsk;
Thomas Gleixner2ff678b2006-01-09 20:52:34 -0800492 ktime_t it_real_incr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
495 cputime_t it_prof_expires, it_virt_expires;
496 cputime_t it_prof_incr, it_virt_incr;
497
498 /* job control IDs */
499 pid_t pgrp;
Eric W. Biedermanab521dc2007-02-12 00:53:00 -0800500 struct pid *tty_old_pgrp;
Cedric Le Goater1ec320a2006-12-08 02:37:55 -0800501
502 union {
503 pid_t session __deprecated;
504 pid_t __session;
505 };
506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 /* boolean value for session group leader */
508 int leader;
509
510 struct tty_struct *tty; /* NULL if no tty */
511
512 /*
513 * Cumulative resource counters for dead threads in the group,
514 * and for reaped dead child processes forked by this group.
515 * Live threads maintain their own counters and add to these
516 * in __exit_signal, except for the group leader.
517 */
518 cputime_t utime, stime, cutime, cstime;
519 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
520 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
Eric Dumazet6eaeeab2007-05-10 22:22:37 -0700521 unsigned long inblock, oublock, cinblock, coublock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523 /*
524 * Cumulative ns of scheduled CPU time for dead threads in the
525 * group, not including a zombie group leader. (This only differs
526 * from jiffies_to_ns(utime + stime) if sched_clock uses something
527 * other than jiffies.)
528 */
Ingo Molnar41b86e92007-07-09 18:51:58 +0200529 unsigned long long sum_sched_runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 /*
532 * We don't bother to synchronize most readers of this at all,
533 * because there is no reader checking a limit that actually needs
534 * to get both rlim_cur and rlim_max atomically, and either one
535 * alone is a single word that can safely be read normally.
536 * getrlimit/setrlimit use task_lock(current->group_leader) to
537 * protect this instead of the siglock, because they really
538 * have no need to disable irqs.
539 */
540 struct rlimit rlim[RLIM_NLIMITS];
541
542 struct list_head cpu_timers[3];
543
544 /* keep the process-shared keyrings here so that they do the right
545 * thing in threads created with CLONE_THREAD */
546#ifdef CONFIG_KEYS
547 struct key *session_keyring; /* keyring inherited over fork */
548 struct key *process_keyring; /* keyring private to this process */
549#endif
KaiGai Kohei0e464812006-06-25 05:49:24 -0700550#ifdef CONFIG_BSD_PROCESS_ACCT
551 struct pacct_struct pacct; /* per-process accounting information */
552#endif
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700553#ifdef CONFIG_TASKSTATS
Shailabh Nagarad4ecbc2006-07-14 00:24:44 -0700554 struct taskstats *stats;
555#endif
Miloslav Trmac522ed772007-07-15 23:40:56 -0700556#ifdef CONFIG_AUDIT
557 unsigned audit_tty;
558 struct tty_audit_buf *tty_audit_buf;
559#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560};
561
Nick Piggin4866cde2005-06-25 14:57:23 -0700562/* Context switch must be unlocked if interrupts are to be enabled */
563#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
564# define __ARCH_WANT_UNLOCKED_CTXSW
565#endif
566
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567/*
568 * Bits in flags field of signal_struct.
569 */
570#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
571#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
572#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
573#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
574
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575/*
576 * Some day this will be a full-fledged user tracking system..
577 */
578struct user_struct {
579 atomic_t __count; /* reference count */
580 atomic_t processes; /* How many processes does this user have? */
581 atomic_t files; /* How many open files does this user have? */
582 atomic_t sigpending; /* How many pending signals does this user have? */
Amy Griffis2d9048e2006-06-01 13:10:59 -0700583#ifdef CONFIG_INOTIFY_USER
Robert Love0eeca282005-07-12 17:06:03 -0400584 atomic_t inotify_watches; /* How many inotify watches does this user have? */
585 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
586#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 /* protected by mq_lock */
588 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
589 unsigned long locked_shm; /* How many pages of mlocked shm ? */
590
591#ifdef CONFIG_KEYS
592 struct key *uid_keyring; /* UID specific keyring */
593 struct key *session_keyring; /* UID's default session keyring */
594#endif
595
596 /* Hash table maintenance information */
Pavel Emelyanov735de222007-09-18 22:46:44 -0700597 struct hlist_node uidhash_node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 uid_t uid;
599};
600
601extern struct user_struct *find_user(uid_t);
602
603extern struct user_struct root_user;
604#define INIT_USER (&root_user)
605
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606struct backing_dev_info;
607struct reclaim_state;
608
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700609#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610struct sched_info {
611 /* cumulative counters */
Balbir Singh172ba842007-07-09 18:52:00 +0200612 unsigned long pcnt; /* # of times run on this cpu */
613 unsigned long long cpu_time, /* time spent on the cpu */
614 run_delay; /* time spent waiting on a runqueue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
616 /* timestamps */
Balbir Singh172ba842007-07-09 18:52:00 +0200617 unsigned long long last_arrival,/* when we last ran on a cpu */
618 last_queued; /* when we were last queued to run */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619};
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700620#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700622#ifdef CONFIG_SCHEDSTATS
Helge Deller15ad7cd2006-12-06 20:40:36 -0800623extern const struct file_operations proc_schedstat_operations;
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700624#endif /* CONFIG_SCHEDSTATS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
Shailabh Nagarca74e922006-07-14 00:24:36 -0700626#ifdef CONFIG_TASK_DELAY_ACCT
627struct task_delay_info {
628 spinlock_t lock;
629 unsigned int flags; /* Private per-task flags */
630
631 /* For each stat XXX, add following, aligned appropriately
632 *
633 * struct timespec XXX_start, XXX_end;
634 * u64 XXX_delay;
635 * u32 XXX_count;
636 *
637 * Atomicity of updates to XXX_delay, XXX_count protected by
638 * single lock above (split into XXX_lock if contention is an issue).
639 */
Shailabh Nagar0ff92242006-07-14 00:24:37 -0700640
641 /*
642 * XXX_count is incremented on every XXX operation, the delay
643 * associated with the operation is added to XXX_delay.
644 * XXX_delay contains the accumulated delay time in nanoseconds.
645 */
646 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
647 u64 blkio_delay; /* wait for sync block io completion */
648 u64 swapin_delay; /* wait for swapin block io completion */
649 u32 blkio_count; /* total count of the number of sync block */
650 /* io operations performed */
651 u32 swapin_count; /* total count of the number of swapin block */
652 /* io operations performed */
Shailabh Nagarca74e922006-07-14 00:24:36 -0700653};
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700654#endif /* CONFIG_TASK_DELAY_ACCT */
655
656static inline int sched_info_on(void)
657{
658#ifdef CONFIG_SCHEDSTATS
659 return 1;
660#elif defined(CONFIG_TASK_DELAY_ACCT)
661 extern int delayacct_on;
662 return delayacct_on;
663#else
664 return 0;
Shailabh Nagarca74e922006-07-14 00:24:36 -0700665#endif
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700666}
Shailabh Nagarca74e922006-07-14 00:24:36 -0700667
Ingo Molnard15bcfd2007-07-09 18:51:57 +0200668enum cpu_idle_type {
669 CPU_IDLE,
670 CPU_NOT_IDLE,
671 CPU_NEWLY_IDLE,
672 CPU_MAX_IDLE_TYPES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673};
674
675/*
676 * sched-domains (multiprocessor balancing) declarations:
677 */
Ingo Molnar9aa7b362007-07-09 18:51:58 +0200678
679/*
680 * Increase resolution of nice-level calculations:
681 */
682#define SCHED_LOAD_SHIFT 10
683#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
684
Suresh Siddhaf8700df2007-08-23 15:18:02 +0200685#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686
Peter Williams2dd73a42006-06-27 02:54:34 -0700687#ifdef CONFIG_SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
689#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
690#define SD_BALANCE_EXEC 4 /* Balance on exec */
Nick Piggin147cbb42005-06-25 14:57:19 -0700691#define SD_BALANCE_FORK 8 /* Balance on fork, clone */
692#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
693#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
694#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
695#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700696#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700697#define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
Christoph Lameter08c183f2006-12-10 02:20:29 -0800698#define SD_SERIALIZE 1024 /* Only a single load balancing instance */
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700699
Siddha, Suresh B89c47102006-10-03 01:14:09 -0700700#define BALANCE_FOR_MC_POWER \
701 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
702
703#define BALANCE_FOR_PKG_POWER \
704 ((sched_mc_power_savings || sched_smt_power_savings) ? \
705 SD_POWERSAVINGS_BALANCE : 0)
706
707#define test_sd_parent(sd, flag) ((sd->parent && \
708 (sd->parent->flags & flag)) ? 1 : 0)
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -0700709
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
711struct sched_group {
712 struct sched_group *next; /* Must be a circular list */
713 cpumask_t cpumask;
714
715 /*
716 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
717 * single CPU. This is read only (except for setup, hotplug CPU).
Eric Dumazet5517d862007-05-08 00:32:57 -0700718 * Note : Never change cpu_power without recompute its reciprocal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 */
Eric Dumazet5517d862007-05-08 00:32:57 -0700720 unsigned int __cpu_power;
721 /*
722 * reciprocal value of cpu_power to avoid expensive divides
723 * (see include/linux/reciprocal_div.h)
724 */
725 u32 reciprocal_cpu_power;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726};
727
728struct sched_domain {
729 /* These fields must be setup */
730 struct sched_domain *parent; /* top domain must be null terminated */
Siddha, Suresh B1a848872006-10-03 01:14:08 -0700731 struct sched_domain *child; /* bottom domain must be null terminated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 struct sched_group *groups; /* the balancing groups of the domain */
733 cpumask_t span; /* span of all CPUs in this domain */
734 unsigned long min_interval; /* Minimum balance interval ms */
735 unsigned long max_interval; /* Maximum balance interval ms */
736 unsigned int busy_factor; /* less balancing by factor if busy */
737 unsigned int imbalance_pct; /* No balance until over watermark */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
Nick Piggin78979862005-06-25 14:57:13 -0700739 unsigned int busy_idx;
740 unsigned int idle_idx;
741 unsigned int newidle_idx;
742 unsigned int wake_idx;
Nick Piggin147cbb42005-06-25 14:57:19 -0700743 unsigned int forkexec_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 int flags; /* See SD_* */
745
746 /* Runtime fields. */
747 unsigned long last_balance; /* init to jiffies. units in jiffies */
748 unsigned int balance_interval; /* initialise to 1. units in ms. */
749 unsigned int nr_balance_failed; /* initialise to 0 */
750
751#ifdef CONFIG_SCHEDSTATS
752 /* load_balance() stats */
Ingo Molnard15bcfd2007-07-09 18:51:57 +0200753 unsigned long lb_cnt[CPU_MAX_IDLE_TYPES];
754 unsigned long lb_failed[CPU_MAX_IDLE_TYPES];
755 unsigned long lb_balanced[CPU_MAX_IDLE_TYPES];
756 unsigned long lb_imbalance[CPU_MAX_IDLE_TYPES];
757 unsigned long lb_gained[CPU_MAX_IDLE_TYPES];
758 unsigned long lb_hot_gained[CPU_MAX_IDLE_TYPES];
759 unsigned long lb_nobusyg[CPU_MAX_IDLE_TYPES];
760 unsigned long lb_nobusyq[CPU_MAX_IDLE_TYPES];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
762 /* Active load balancing */
763 unsigned long alb_cnt;
764 unsigned long alb_failed;
765 unsigned long alb_pushed;
766
Nick Piggin68767a02005-06-25 14:57:20 -0700767 /* SD_BALANCE_EXEC stats */
768 unsigned long sbe_cnt;
769 unsigned long sbe_balanced;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 unsigned long sbe_pushed;
771
Nick Piggin68767a02005-06-25 14:57:20 -0700772 /* SD_BALANCE_FORK stats */
773 unsigned long sbf_cnt;
774 unsigned long sbf_balanced;
775 unsigned long sbf_pushed;
776
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 /* try_to_wake_up() stats */
778 unsigned long ttwu_wake_remote;
779 unsigned long ttwu_move_affine;
780 unsigned long ttwu_move_balance;
781#endif
782};
783
Srivatsa Vaddagiri51888ca2006-06-27 02:54:38 -0700784extern int partition_sched_domains(cpumask_t *partition1,
Dinakar Guniguntala1a20ff22005-06-25 14:57:33 -0700785 cpumask_t *partition2);
akpm@osdl.org198e2f12006-01-12 01:05:30 -0800786
akpm@osdl.org198e2f12006-01-12 01:05:30 -0800787#endif /* CONFIG_SMP */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
Con Kolivasd02c7a82007-07-26 13:40:43 +0200789/*
790 * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
791 * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
792 * task of nice 0 or enough lower priority tasks to bring up the
793 * weighted_cpuload
794 */
795static inline int above_background_load(void)
796{
797 unsigned long cpu;
798
799 for_each_online_cpu(cpu) {
800 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
801 return 1;
802 }
803 return 0;
804}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
806struct io_context; /* See blkdev.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807struct cpuset;
808
809#define NGROUPS_SMALL 32
810#define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
811struct group_info {
812 int ngroups;
813 atomic_t usage;
814 gid_t small_block[NGROUPS_SMALL];
815 int nblocks;
816 gid_t *blocks[0];
817};
818
819/*
820 * get_group_info() must be called with the owning task locked (via task_lock())
821 * when task != current. The reason being that the vast majority of callers are
822 * looking at current->group_info, which can not be changed except by the
823 * current task. Changing current->group_info requires the task lock, too.
824 */
825#define get_group_info(group_info) do { \
826 atomic_inc(&(group_info)->usage); \
827} while (0)
828
829#define put_group_info(group_info) do { \
830 if (atomic_dec_and_test(&(group_info)->usage)) \
831 groups_free(group_info); \
832} while (0)
833
David Howells3e301482005-06-23 22:00:56 -0700834extern struct group_info *groups_alloc(int gidsetsize);
835extern void groups_free(struct group_info *group_info);
836extern int set_current_groups(struct group_info *group_info);
837extern int groups_search(struct group_info *group_info, gid_t grp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838/* access the groups "array" with this macro */
839#define GROUP_AT(gi, i) \
840 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
841
Chen, Kenneth W383f2832005-09-09 13:02:02 -0700842#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
Ingo Molnar36c8b582006-07-03 00:25:41 -0700843extern void prefetch_stack(struct task_struct *t);
Chen, Kenneth W383f2832005-09-09 13:02:02 -0700844#else
845static inline void prefetch_stack(struct task_struct *t) { }
846#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
848struct audit_context; /* See audit.c */
849struct mempolicy;
Jens Axboeb92ce552006-04-11 13:52:07 +0200850struct pipe_inode_info;
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -0700851struct uts_namespace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Ingo Molnar20b8a592007-07-09 18:51:58 +0200853struct rq;
854struct sched_domain;
855
856struct sched_class {
857 struct sched_class *next;
858
Ingo Molnarfd390f62007-08-09 11:16:48 +0200859 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
Ingo Molnarf02231e2007-08-09 11:16:48 +0200860 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
Dmitry Adamushko4530d7a2007-10-15 17:00:08 +0200861 void (*yield_task) (struct rq *rq);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200862
863 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
864
Ingo Molnarfb8d4722007-08-09 11:16:48 +0200865 struct task_struct * (*pick_next_task) (struct rq *rq);
Ingo Molnar31ee5292007-08-09 11:16:49 +0200866 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200867
Peter Williams43010652007-08-09 11:16:46 +0200868 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
Ingo Molnar20b8a592007-07-09 18:51:58 +0200869 struct rq *busiest,
870 unsigned long max_nr_move, unsigned long max_load_move,
871 struct sched_domain *sd, enum cpu_idle_type idle,
Peter Williamsa4ac01c2007-08-09 11:16:46 +0200872 int *all_pinned, int *this_best_prio);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200873
874 void (*set_curr_task) (struct rq *rq);
875 void (*task_tick) (struct rq *rq, struct task_struct *p);
Ingo Molnaree0827d2007-08-09 11:16:49 +0200876 void (*task_new) (struct rq *rq, struct task_struct *p);
Ingo Molnar20b8a592007-07-09 18:51:58 +0200877};
878
879struct load_weight {
880 unsigned long weight, inv_weight;
881};
882
883/*
884 * CFS stats for a schedulable entity (task, task-group etc)
885 *
886 * Current field usage histogram:
887 *
888 * 4 se->block_start
889 * 4 se->run_node
890 * 4 se->sleep_start
Ingo Molnar20b8a592007-07-09 18:51:58 +0200891 * 6 se->load.weight
Ingo Molnar20b8a592007-07-09 18:51:58 +0200892 */
893struct sched_entity {
Ingo Molnar20b8a592007-07-09 18:51:58 +0200894 struct load_weight load; /* for load-balancing */
895 struct rb_node run_node;
896 unsigned int on_rq;
897
Ingo Molnar20b8a592007-07-09 18:51:58 +0200898 u64 exec_start;
Ingo Molnar94c18222007-08-02 17:41:40 +0200899 u64 sum_exec_runtime;
Ingo Molnare9acbff2007-10-15 17:00:04 +0200900 u64 vruntime;
Ingo Molnarf6cf8912007-08-28 12:53:24 +0200901 u64 prev_sum_exec_runtime;
Ingo Molnar94c18222007-08-02 17:41:40 +0200902
903#ifdef CONFIG_SCHEDSTATS
904 u64 wait_start;
905 u64 wait_max;
Ingo Molnar94c18222007-08-02 17:41:40 +0200906
907 u64 sleep_start;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200908 u64 sleep_max;
Ingo Molnar94c18222007-08-02 17:41:40 +0200909 s64 sum_sleep_runtime;
910
911 u64 block_start;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200912 u64 block_max;
913 u64 exec_max;
Ingo Molnareba1ed42007-10-15 17:00:02 +0200914 u64 slice_max;
Ingo Molnar94c18222007-08-02 17:41:40 +0200915#endif
916
Ingo Molnar20b8a592007-07-09 18:51:58 +0200917#ifdef CONFIG_FAIR_GROUP_SCHED
918 struct sched_entity *parent;
919 /* rq on which this entity is (to be) queued: */
920 struct cfs_rq *cfs_rq;
921 /* rq "owned" by this entity/group: */
922 struct cfs_rq *my_q;
923#endif
924};
Ingo Molnar70b97a72006-07-03 00:25:42 -0700925
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926struct task_struct {
927 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
Roman Zippelf7e42172007-05-09 02:35:17 -0700928 void *stack;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 atomic_t usage;
William Cohen97dc32c2007-05-08 00:23:41 -0700930 unsigned int flags; /* per process flags, defined below */
931 unsigned int ptrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -0700933 int lock_depth; /* BKL lock depth */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
Peter Williams2dd73a42006-06-27 02:54:34 -0700935#ifdef CONFIG_SMP
936#ifdef __ARCH_WANT_UNLOCKED_CTXSW
Nick Piggin4866cde2005-06-25 14:57:23 -0700937 int oncpu;
938#endif
Peter Williams2dd73a42006-06-27 02:54:34 -0700939#endif
Ingo Molnar50e645a2007-07-09 18:52:00 +0200940
Ingo Molnarb29739f2006-06-27 02:54:51 -0700941 int prio, static_prio, normal_prio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 struct list_head run_list;
Ingo Molnar20b8a592007-07-09 18:51:58 +0200943 struct sched_class *sched_class;
944 struct sched_entity se;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
Avi Kivitye107be32007-07-26 13:40:43 +0200946#ifdef CONFIG_PREEMPT_NOTIFIERS
947 /* list of struct preempt_notifier: */
948 struct hlist_head preempt_notifiers;
949#endif
950
Jens Axboe22e2c502005-06-27 10:55:12 +0200951 unsigned short ioprio;
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -0700952#ifdef CONFIG_BLK_DEV_IO_TRACE
Jens Axboe2056a782006-03-23 20:00:26 +0100953 unsigned int btrace_seq;
Alexey Dobriyan6c5c9342006-09-29 01:59:40 -0700954#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
William Cohen97dc32c2007-05-08 00:23:41 -0700956 unsigned int policy;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 cpumask_t cpus_allowed;
Ingo Molnar50e645a2007-07-09 18:52:00 +0200958 unsigned int time_slice;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
Chandra Seetharaman52f17b62006-07-14 00:24:38 -0700960#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 struct sched_info sched_info;
962#endif
963
964 struct list_head tasks;
965 /*
966 * ptrace_list/ptrace_children forms the list of my children
967 * that were stolen by a ptracer.
968 */
969 struct list_head ptrace_children;
970 struct list_head ptrace_list;
971
972 struct mm_struct *mm, *active_mm;
973
974/* task state */
975 struct linux_binfmt *binfmt;
William Cohen97dc32c2007-05-08 00:23:41 -0700976 int exit_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 int exit_code, exit_signal;
978 int pdeath_signal; /* The signal sent when the parent dies */
979 /* ??? */
William Cohen97dc32c2007-05-08 00:23:41 -0700980 unsigned int personality;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 unsigned did_exec:1;
982 pid_t pid;
983 pid_t tgid;
Arjan van de Ven0a4254052006-09-26 10:52:38 +0200984
985#ifdef CONFIG_CC_STACKPROTECTOR
986 /* Canary value for the -fstack-protector gcc feature */
987 unsigned long stack_canary;
988#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 /*
990 * pointers to (original) parent process, youngest child, younger sibling,
991 * older sibling, respectively. (p->father can be replaced with
992 * p->parent->pid)
993 */
994 struct task_struct *real_parent; /* real parent process (when being debugged) */
995 struct task_struct *parent; /* parent process */
996 /*
997 * children/sibling forms the list of my children plus the
998 * tasks I'm ptracing.
999 */
1000 struct list_head children; /* list of my children */
1001 struct list_head sibling; /* linkage in my parent's children list */
1002 struct task_struct *group_leader; /* threadgroup leader */
1003
1004 /* PID/PID hash table linkage. */
Eric W. Biederman92476d72006-03-31 02:31:42 -08001005 struct pid_link pids[PIDTYPE_MAX];
Oleg Nesterov47e65322006-03-28 16:11:25 -08001006 struct list_head thread_group;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007
1008 struct completion *vfork_done; /* for vfork() */
1009 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1010 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1011
William Cohen97dc32c2007-05-08 00:23:41 -07001012 unsigned int rt_priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 cputime_t utime, stime;
1014 unsigned long nvcsw, nivcsw; /* context switch counts */
Tomas Janousek924b42d2007-07-15 23:39:42 -07001015 struct timespec start_time; /* monotonic time */
1016 struct timespec real_start_time; /* boot based time */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1018 unsigned long min_flt, maj_flt;
1019
1020 cputime_t it_prof_expires, it_virt_expires;
1021 unsigned long long it_sched_expires;
1022 struct list_head cpu_timers[3];
1023
1024/* process credentials */
1025 uid_t uid,euid,suid,fsuid;
1026 gid_t gid,egid,sgid,fsgid;
1027 struct group_info *group_info;
1028 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
1029 unsigned keep_capabilities:1;
1030 struct user_struct *user;
1031#ifdef CONFIG_KEYS
David Howellsb5f545c2006-01-08 01:02:47 -08001032 struct key *request_key_auth; /* assumed request_key authority */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 struct key *thread_keyring; /* keyring private to this thread */
David Howells3e301482005-06-23 22:00:56 -07001034 unsigned char jit_keyring; /* default keyring to attach requested keys to */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035#endif
Arjan van de Vene07e23e2006-09-26 10:52:36 +02001036 /*
1037 * fpu_counter contains the number of consecutive context switches
1038 * that the FPU is used. If this is over a threshold, the lazy fpu
1039 * saving becomes unlazy to save the trap. This is an unsigned char
1040 * so that after 256 times the counter wraps and the behavior turns
1041 * lazy again; this to deal with bursty apps that only use FPU for
1042 * a short time
1043 */
1044 unsigned char fpu_counter;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 int oomkilladj; /* OOM kill score adjustment (bit shift). */
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -07001046 char comm[TASK_COMM_LEN]; /* executable name excluding path
1047 - access with [gs]et_task_comm (which lock
1048 it with task_lock())
1049 - initialized normally by flush_old_exec */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050/* file system info */
1051 int link_count, total_link_count;
Alexey Dobriyan3d5b6fc2006-09-29 01:59:40 -07001052#ifdef CONFIG_SYSVIPC
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053/* ipc stuff */
1054 struct sysv_sem sysvsem;
Alexey Dobriyan3d5b6fc2006-09-29 01:59:40 -07001055#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056/* CPU-specific state of this task */
1057 struct thread_struct thread;
1058/* filesystem information */
1059 struct fs_struct *fs;
1060/* open file information */
1061 struct files_struct *files;
Serge E. Hallyn1651e142006-10-02 02:18:08 -07001062/* namespaces */
Serge E. Hallynab516012006-10-02 02:18:06 -07001063 struct nsproxy *nsproxy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064/* signal handlers */
1065 struct signal_struct *signal;
1066 struct sighand_struct *sighand;
1067
1068 sigset_t blocked, real_blocked;
David Woodhouse150256d2006-01-18 17:43:57 -08001069 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 struct sigpending pending;
1071
1072 unsigned long sas_ss_sp;
1073 size_t sas_ss_size;
1074 int (*notifier)(void *priv);
1075 void *notifier_data;
1076 sigset_t *notifier_mask;
1077
1078 void *security;
1079 struct audit_context *audit_context;
1080 seccomp_t seccomp;
1081
1082/* Thread group tracking */
1083 u32 parent_exec_id;
1084 u32 self_exec_id;
1085/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1086 spinlock_t alloc_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087
Ingo Molnarb29739f2006-06-27 02:54:51 -07001088 /* Protection of the PI data structures: */
1089 spinlock_t pi_lock;
1090
Ingo Molnar23f78d4a2006-06-27 02:54:53 -07001091#ifdef CONFIG_RT_MUTEXES
1092 /* PI waiters blocked on a rt_mutex held by this task */
1093 struct plist_head pi_waiters;
1094 /* Deadlock detection and priority inheritance handling */
1095 struct rt_mutex_waiter *pi_blocked_on;
Ingo Molnar23f78d4a2006-06-27 02:54:53 -07001096#endif
1097
Ingo Molnar408894e2006-01-09 15:59:20 -08001098#ifdef CONFIG_DEBUG_MUTEXES
1099 /* mutex deadlock detection */
1100 struct mutex_waiter *blocked_on;
1101#endif
Ingo Molnarde30a2b2006-07-03 00:24:42 -07001102#ifdef CONFIG_TRACE_IRQFLAGS
1103 unsigned int irq_events;
1104 int hardirqs_enabled;
1105 unsigned long hardirq_enable_ip;
1106 unsigned int hardirq_enable_event;
1107 unsigned long hardirq_disable_ip;
1108 unsigned int hardirq_disable_event;
1109 int softirqs_enabled;
1110 unsigned long softirq_disable_ip;
1111 unsigned int softirq_disable_event;
1112 unsigned long softirq_enable_ip;
1113 unsigned int softirq_enable_event;
1114 int hardirq_context;
1115 int softirq_context;
1116#endif
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001117#ifdef CONFIG_LOCKDEP
1118# define MAX_LOCK_DEPTH 30UL
1119 u64 curr_chain_key;
1120 int lockdep_depth;
1121 struct held_lock held_locks[MAX_LOCK_DEPTH];
1122 unsigned int lockdep_recursion;
1123#endif
Ingo Molnar408894e2006-01-09 15:59:20 -08001124
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125/* journalling filesystem info */
1126 void *journal_info;
1127
Neil Brownd89d8792007-05-01 09:53:42 +02001128/* stacked block device info */
1129 struct bio *bio_list, **bio_tail;
1130
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131/* VM state */
1132 struct reclaim_state *reclaim_state;
1133
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 struct backing_dev_info *backing_dev_info;
1135
1136 struct io_context *io_context;
1137
1138 unsigned long ptrace_message;
1139 siginfo_t *last_siginfo; /* For ptrace use. */
1140/*
1141 * current io wait handle: wait queue entry to use for io waits
1142 * If this thread is processing aio, this points at the waitqueue
1143 * inside the currently handled kiocb. It may be NULL (i.e. default
1144 * to a stack based synchronous wait) if its doing sync IO.
1145 */
1146 wait_queue_t *io_wait;
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001147#ifdef CONFIG_TASK_XACCT
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148/* i/o counters(bytes read/written, #syscalls */
1149 u64 rchar, wchar, syscr, syscw;
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001150#endif
Andrew Morton7c3ab732006-12-10 02:19:19 -08001151 struct task_io_accounting ioac;
Jay Lan8f0ab512006-09-30 23:28:59 -07001152#if defined(CONFIG_TASK_XACCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 u64 acct_rss_mem1; /* accumulated rss usage */
1154 u64 acct_vm_mem1; /* accumulated virtual memory usage */
Jay Landb5fed262006-09-30 23:29:00 -07001155 cputime_t acct_stimexpd;/* stime since last update */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156#endif
1157#ifdef CONFIG_NUMA
1158 struct mempolicy *mempolicy;
1159 short il_next;
1160#endif
1161#ifdef CONFIG_CPUSETS
1162 struct cpuset *cpuset;
1163 nodemask_t mems_allowed;
1164 int cpuset_mems_generation;
Paul Jackson825a46a2006-03-24 03:16:03 -08001165 int cpuset_mem_spread_rotor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166#endif
Ingo Molnar0771dfe2006-03-27 01:16:22 -08001167 struct robust_list_head __user *robust_list;
Ingo Molnar34f192c2006-03-27 01:16:24 -08001168#ifdef CONFIG_COMPAT
1169 struct compat_robust_list_head __user *compat_robust_list;
1170#endif
Ingo Molnarc87e2832006-06-27 02:54:58 -07001171 struct list_head pi_state_list;
1172 struct futex_pi_state *pi_state_cache;
Ingo Molnar0771dfe2006-03-27 01:16:22 -08001173
Jens Axboe22e2c502005-06-27 10:55:12 +02001174 atomic_t fs_excl; /* holding fs exclusive resources */
Ingo Molnare56d0902006-01-08 01:01:37 -08001175 struct rcu_head rcu;
Jens Axboeb92ce552006-04-11 13:52:07 +02001176
1177 /*
1178 * cache last used pipe for splice
1179 */
1180 struct pipe_inode_info *splice_pipe;
Shailabh Nagarca74e922006-07-14 00:24:36 -07001181#ifdef CONFIG_TASK_DELAY_ACCT
1182 struct task_delay_info *delays;
1183#endif
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001184#ifdef CONFIG_FAULT_INJECTION
1185 int make_it_fail;
1186#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187};
1188
Ingo Molnare05606d2007-07-09 18:51:59 +02001189/*
1190 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1191 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1192 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1193 * values are inverted: lower p->prio value means higher priority.
1194 *
1195 * The MAX_USER_RT_PRIO value allows the actual maximum
1196 * RT priority to be separate from the value exported to
1197 * user-space. This allows kernel threads to set their
1198 * priority to a value higher than any user task. Note:
1199 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1200 */
1201
1202#define MAX_USER_RT_PRIO 100
1203#define MAX_RT_PRIO MAX_USER_RT_PRIO
1204
1205#define MAX_PRIO (MAX_RT_PRIO + 40)
1206#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1207
1208static inline int rt_prio(int prio)
1209{
1210 if (unlikely(prio < MAX_RT_PRIO))
1211 return 1;
1212 return 0;
1213}
1214
1215static inline int rt_task(struct task_struct *p)
1216{
1217 return rt_prio(p->prio);
1218}
1219
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220static inline pid_t process_group(struct task_struct *tsk)
1221{
1222 return tsk->signal->pgrp;
1223}
1224
Cedric Le Goater1ec320a2006-12-08 02:37:55 -08001225static inline pid_t signal_session(struct signal_struct *sig)
1226{
1227 return sig->__session;
1228}
1229
Cedric Le Goater937949d2006-12-08 02:37:54 -08001230static inline pid_t process_session(struct task_struct *tsk)
1231{
Cedric Le Goater1ec320a2006-12-08 02:37:55 -08001232 return signal_session(tsk->signal);
1233}
1234
1235static inline void set_signal_session(struct signal_struct *sig, pid_t session)
1236{
1237 sig->__session = session;
Cedric Le Goater937949d2006-12-08 02:37:54 -08001238}
1239
Eric W. Biederman22c935f2006-10-02 02:17:09 -07001240static inline struct pid *task_pid(struct task_struct *task)
1241{
1242 return task->pids[PIDTYPE_PID].pid;
1243}
1244
1245static inline struct pid *task_tgid(struct task_struct *task)
1246{
1247 return task->group_leader->pids[PIDTYPE_PID].pid;
1248}
1249
1250static inline struct pid *task_pgrp(struct task_struct *task)
1251{
1252 return task->group_leader->pids[PIDTYPE_PGID].pid;
1253}
1254
1255static inline struct pid *task_session(struct task_struct *task)
1256{
1257 return task->group_leader->pids[PIDTYPE_SID].pid;
1258}
1259
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260/**
1261 * pid_alive - check that a task structure is not stale
1262 * @p: Task structure to be checked.
1263 *
1264 * Test if a process is not yet dead (at most zombie state)
1265 * If pid_alive fails, then pointers within the task structure
1266 * can be stale and must not be dereferenced.
1267 */
1268static inline int pid_alive(struct task_struct *p)
1269{
Eric W. Biederman92476d72006-03-31 02:31:42 -08001270 return p->pids[PIDTYPE_PID].pid != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271}
1272
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001273/**
Henne32602592006-10-06 00:44:01 -07001274 * is_init - check if a task structure is init
1275 * @tsk: Task structure to be checked.
1276 *
1277 * Check if a task structure is the first user space task the kernel created.
Sukadev Bhattiproluf400e192006-09-29 02:00:07 -07001278 */
1279static inline int is_init(struct task_struct *tsk)
1280{
1281 return tsk->pid == 1;
1282}
1283
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001284extern struct pid *cad_pid;
1285
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286extern void free_task(struct task_struct *tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
Ingo Molnare56d0902006-01-08 01:01:37 -08001288
Andrew Morton158d9eb2006-03-31 02:31:34 -08001289extern void __put_task_struct(struct task_struct *t);
Ingo Molnare56d0902006-01-08 01:01:37 -08001290
1291static inline void put_task_struct(struct task_struct *t)
1292{
1293 if (atomic_dec_and_test(&t->usage))
Eric W. Biederman8c7904a2006-03-31 02:31:37 -08001294 __put_task_struct(t);
Ingo Molnare56d0902006-01-08 01:01:37 -08001295}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296
1297/*
1298 * Per process flags
1299 */
1300#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1301 /* Not implemented yet, only for 486*/
1302#define PF_STARTING 0x00000002 /* being created */
1303#define PF_EXITING 0x00000004 /* getting shut down */
Alexey Kuznetsov778e9a92007-06-08 13:47:00 -07001304#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1306#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1307#define PF_DUMPCORE 0x00000200 /* dumped core */
1308#define PF_SIGNALED 0x00000400 /* killed by a signal */
1309#define PF_MEMALLOC 0x00000800 /* Allocating memory */
1310#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1311#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1313#define PF_FROZEN 0x00010000 /* frozen for system suspend */
1314#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1315#define PF_KSWAPD 0x00040000 /* I am kswapd */
1316#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1317#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
Jens Axboeb31dc662006-06-13 08:26:10 +02001318#define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1319#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1320#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1321#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1322#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
Paul Jacksonc61afb12006-03-24 03:16:08 -08001323#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
Thomas Gleixner61a87122006-06-27 02:54:56 -07001324#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
Rafael J. Wysockiba96a0c2007-05-23 13:57:25 -07001325#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326
1327/*
1328 * Only the _current_ task can read/write to tsk->flags, but other
1329 * tasks can access tsk->flags in readonly mode for example
1330 * with tsk_used_math (like during threaded core dumping).
1331 * There is however an exception to this rule during ptrace
1332 * or during fork: the ptracer task is allowed to write to the
1333 * child->flags of its traced child (same goes for fork, the parent
1334 * can write to the child->flags), because we're guaranteed the
1335 * child is not running and in turn not changing child->flags
1336 * at the same time the parent does it.
1337 */
1338#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1339#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1340#define clear_used_math() clear_stopped_child_used_math(current)
1341#define set_used_math() set_stopped_child_used_math(current)
1342#define conditional_stopped_child_used_math(condition, child) \
1343 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1344#define conditional_used_math(condition) \
1345 conditional_stopped_child_used_math(condition, current)
1346#define copy_to_stopped_child_used_math(child) \
1347 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1348/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1349#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1350#define used_math() tsk_used_math(current)
1351
1352#ifdef CONFIG_SMP
Ingo Molnar36c8b582006-07-03 00:25:41 -07001353extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354#else
Ingo Molnar36c8b582006-07-03 00:25:41 -07001355static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356{
Paul Jackson4098f992005-10-30 15:03:21 -08001357 if (!cpu_isset(0, new_mask))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 return -EINVAL;
1359 return 0;
1360}
1361#endif
1362
1363extern unsigned long long sched_clock(void);
Ingo Molnare436d802007-07-19 21:28:35 +02001364
1365/*
1366 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1367 * clock constructed from sched_clock():
1368 */
1369extern unsigned long long cpu_clock(int cpu);
1370
Ingo Molnar36c8b582006-07-03 00:25:41 -07001371extern unsigned long long
Ingo Molnar41b86e92007-07-09 18:51:58 +02001372task_sched_runtime(struct task_struct *task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373
1374/* sched_exec is called by processes performing an exec */
1375#ifdef CONFIG_SMP
1376extern void sched_exec(void);
1377#else
1378#define sched_exec() {}
1379#endif
1380
Ingo Molnar2aa44d02007-08-23 15:18:02 +02001381extern void sched_clock_idle_sleep_event(void);
1382extern void sched_clock_idle_wakeup_event(u64 delta_ns);
Ingo Molnarbb29ab22007-07-09 18:51:59 +02001383
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384#ifdef CONFIG_HOTPLUG_CPU
1385extern void idle_task_exit(void);
1386#else
1387static inline void idle_task_exit(void) {}
1388#endif
1389
1390extern void sched_idle_next(void);
Ingo Molnarb29739f2006-06-27 02:54:51 -07001391
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001392#ifdef CONFIG_SCHED_DEBUG
Peter Zijlstra21805082007-08-25 18:41:53 +02001393extern unsigned int sysctl_sched_latency;
Ingo Molnar172ac3d2007-08-25 18:41:53 +02001394extern unsigned int sysctl_sched_min_granularity;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001395extern unsigned int sysctl_sched_wakeup_granularity;
1396extern unsigned int sysctl_sched_batch_wakeup_granularity;
1397extern unsigned int sysctl_sched_stat_granularity;
1398extern unsigned int sysctl_sched_runtime_limit;
1399extern unsigned int sysctl_sched_child_runs_first;
1400extern unsigned int sysctl_sched_features;
Ingo Molnar2bd8e6d2007-10-15 17:00:02 +02001401#endif
1402
1403extern unsigned int sysctl_sched_compat_yield;
Ingo Molnarbf0f6f22007-07-09 18:51:58 +02001404
Ingo Molnarb29739f2006-06-27 02:54:51 -07001405#ifdef CONFIG_RT_MUTEXES
Ingo Molnar36c8b582006-07-03 00:25:41 -07001406extern int rt_mutex_getprio(struct task_struct *p);
1407extern void rt_mutex_setprio(struct task_struct *p, int prio);
1408extern void rt_mutex_adjust_pi(struct task_struct *p);
Ingo Molnarb29739f2006-06-27 02:54:51 -07001409#else
Ingo Molnar36c8b582006-07-03 00:25:41 -07001410static inline int rt_mutex_getprio(struct task_struct *p)
Ingo Molnarb29739f2006-06-27 02:54:51 -07001411{
1412 return p->normal_prio;
1413}
Thomas Gleixner95e02ca2006-06-27 02:55:02 -07001414# define rt_mutex_adjust_pi(p) do { } while (0)
Ingo Molnarb29739f2006-06-27 02:54:51 -07001415#endif
1416
Ingo Molnar36c8b582006-07-03 00:25:41 -07001417extern void set_user_nice(struct task_struct *p, long nice);
1418extern int task_prio(const struct task_struct *p);
1419extern int task_nice(const struct task_struct *p);
1420extern int can_nice(const struct task_struct *p, const int nice);
1421extern int task_curr(const struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422extern int idle_cpu(int cpu);
1423extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
Ingo Molnar36c8b582006-07-03 00:25:41 -07001424extern struct task_struct *idle_task(int cpu);
1425extern struct task_struct *curr_task(int cpu);
1426extern void set_curr_task(int cpu, struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427
1428void yield(void);
1429
1430/*
1431 * The default (Linux) execution domain.
1432 */
1433extern struct exec_domain default_exec_domain;
1434
1435union thread_union {
1436 struct thread_info thread_info;
1437 unsigned long stack[THREAD_SIZE/sizeof(long)];
1438};
1439
1440#ifndef __HAVE_ARCH_KSTACK_END
1441static inline int kstack_end(void *addr)
1442{
1443 /* Reliable end of stack detection:
1444 * Some APM bios versions misalign the stack
1445 */
1446 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1447}
1448#endif
1449
1450extern union thread_union init_thread_union;
1451extern struct task_struct init_task;
1452
1453extern struct mm_struct init_mm;
1454
1455#define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1456extern struct task_struct *find_task_by_pid_type(int type, int pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457extern void __set_special_pids(pid_t session, pid_t pgrp);
1458
1459/* per-UID process charging. */
Cedric Le Goateracce2922007-07-15 23:40:59 -07001460extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461static inline struct user_struct *get_uid(struct user_struct *u)
1462{
1463 atomic_inc(&u->__count);
1464 return u;
1465}
1466extern void free_uid(struct user_struct *);
1467extern void switch_uid(struct user_struct *);
Pavel Emelyanov28f300d2007-09-18 22:46:45 -07001468extern void release_uids(struct user_namespace *ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469
1470#include <asm/current.h>
1471
Atsushi Nemoto3171a032006-09-29 02:00:32 -07001472extern void do_timer(unsigned long ticks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473
1474extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
1475extern int FASTCALL(wake_up_process(struct task_struct * tsk));
1476extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
1477 unsigned long clone_flags));
1478#ifdef CONFIG_SMP
1479 extern void kick_process(struct task_struct *tsk);
1480#else
1481 static inline void kick_process(struct task_struct *tsk) { }
1482#endif
Ingo Molnarad46c2c2007-07-09 18:52:00 +02001483extern void sched_fork(struct task_struct *p, int clone_flags);
1484extern void sched_dead(struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485
1486extern int in_group_p(gid_t);
1487extern int in_egroup_p(gid_t);
1488
1489extern void proc_caches_init(void);
1490extern void flush_signals(struct task_struct *);
Oleg Nesterov10ab8252007-05-09 02:34:37 -07001491extern void ignore_signals(struct task_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492extern void flush_signal_handlers(struct task_struct *, int force_default);
1493extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1494
1495static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1496{
1497 unsigned long flags;
1498 int ret;
1499
1500 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1501 ret = dequeue_signal(tsk, mask, info);
1502 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1503
1504 return ret;
1505}
1506
1507extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1508 sigset_t *mask);
1509extern void unblock_all_signals(void);
1510extern void release_task(struct task_struct * p);
1511extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1512extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
1513extern int force_sigsegv(int, struct task_struct *);
1514extern int force_sig_info(int, struct siginfo *, struct task_struct *);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001515extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1516extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1517extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
Eric W. Biederman2425c082006-10-02 02:17:28 -07001518extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
Eric W. Biedermanc4b92fc2006-10-02 02:17:10 -07001519extern int kill_pgrp(struct pid *pid, int sig, int priv);
1520extern int kill_pid(struct pid *pid, int sig, int priv);
Matthew Wilcoxc3de4b32007-02-09 08:11:47 -07001521extern int kill_proc_info(int, struct siginfo *, pid_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522extern void do_notify_parent(struct task_struct *, int);
1523extern void force_sig(int, struct task_struct *);
1524extern void force_sig_specific(int, struct task_struct *);
1525extern int send_sig(int, struct task_struct *, int);
1526extern void zap_other_threads(struct task_struct *p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527extern int kill_proc(pid_t, int, int);
1528extern struct sigqueue *sigqueue_alloc(void);
1529extern void sigqueue_free(struct sigqueue *);
1530extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
1531extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
Oleg Nesterov9ac95f22006-02-09 22:41:50 +03001532extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1534
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001535static inline int kill_cad_pid(int sig, int priv)
1536{
1537 return kill_pid(cad_pid, sig, priv);
1538}
1539
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540/* These can be the second arg to send_sig_info/send_group_sig_info. */
1541#define SEND_SIG_NOINFO ((struct siginfo *) 0)
1542#define SEND_SIG_PRIV ((struct siginfo *) 1)
1543#define SEND_SIG_FORCED ((struct siginfo *) 2)
1544
Oleg Nesterov621d3122005-10-30 15:03:45 -08001545static inline int is_si_special(const struct siginfo *info)
1546{
1547 return info <= SEND_SIG_FORCED;
1548}
1549
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550/* True if we are on the alternate signal stack. */
1551
1552static inline int on_sig_stack(unsigned long sp)
1553{
1554 return (sp - current->sas_ss_sp < current->sas_ss_size);
1555}
1556
1557static inline int sas_ss_flags(unsigned long sp)
1558{
1559 return (current->sas_ss_size == 0 ? SS_DISABLE
1560 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1561}
1562
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563/*
1564 * Routines for handling mm_structs
1565 */
1566extern struct mm_struct * mm_alloc(void);
1567
1568/* mmdrop drops the mm and the page tables */
1569extern void FASTCALL(__mmdrop(struct mm_struct *));
1570static inline void mmdrop(struct mm_struct * mm)
1571{
Ingo Molnar6fb43d72007-07-09 18:52:01 +02001572 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 __mmdrop(mm);
1574}
1575
1576/* mmput gets rid of the mappings and all user-space */
1577extern void mmput(struct mm_struct *);
1578/* Grab a reference to a task's mm, if it is not already going away */
1579extern struct mm_struct *get_task_mm(struct task_struct *task);
1580/* Remove the current tasks stale references to the old mm_struct */
1581extern void mm_release(struct task_struct *, struct mm_struct *);
1582
1583extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1584extern void flush_thread(void);
1585extern void exit_thread(void);
1586
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587extern void exit_files(struct task_struct *);
Oleg Nesterov6b3934e2006-03-28 16:11:16 -08001588extern void __cleanup_signal(struct signal_struct *);
Oleg Nesterova7e53282006-03-28 16:11:27 -08001589extern void __cleanup_sighand(struct sighand_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590extern void exit_itimers(struct signal_struct *);
1591
1592extern NORET_TYPE void do_group_exit(int);
1593
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594extern void daemonize(const char *, ...);
1595extern int allow_signal(int);
1596extern int disallow_signal(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597
1598extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1599extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
Ingo Molnar36c8b582006-07-03 00:25:41 -07001600struct task_struct *fork_idle(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601
1602extern void set_task_comm(struct task_struct *tsk, char *from);
1603extern void get_task_comm(char *to, struct task_struct *tsk);
1604
1605#ifdef CONFIG_SMP
Ingo Molnar36c8b582006-07-03 00:25:41 -07001606extern void wait_task_inactive(struct task_struct * p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607#else
1608#define wait_task_inactive(p) do { } while (0)
1609#endif
1610
1611#define remove_parent(p) list_del_init(&(p)->sibling)
Oleg Nesterov8fafabd2006-03-28 16:11:05 -08001612#define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613
Eric W. Biederman5e85d4a2006-04-18 22:20:16 -07001614#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615
1616#define for_each_process(p) \
1617 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1618
1619/*
1620 * Careful: do_each_thread/while_each_thread is a double loop so
1621 * 'break' will not work as expected - use goto instead.
1622 */
1623#define do_each_thread(g, t) \
1624 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1625
1626#define while_each_thread(g, t) \
1627 while ((t = next_thread(t)) != g)
1628
Eric W. Biedermande12a782006-04-10 17:16:49 -06001629/* de_thread depends on thread_group_leader not being a pid based check */
1630#define thread_group_leader(p) (p == p->group_leader)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631
Eric W. Biederman0804ef42006-10-02 02:17:04 -07001632/* Do to the insanities of de_thread it is possible for a process
1633 * to have the pid of the thread group leader without actually being
1634 * the thread group leader. For iteration through the pids in proc
1635 * all we care about is that we have a task with the appropriate
1636 * pid, we don't actually care if we have the right task.
1637 */
1638static inline int has_group_leader_pid(struct task_struct *p)
1639{
1640 return p->pid == p->tgid;
1641}
1642
Ingo Molnar36c8b582006-07-03 00:25:41 -07001643static inline struct task_struct *next_thread(const struct task_struct *p)
Oleg Nesterov47e65322006-03-28 16:11:25 -08001644{
1645 return list_entry(rcu_dereference(p->thread_group.next),
Ingo Molnar36c8b582006-07-03 00:25:41 -07001646 struct task_struct, thread_group);
Oleg Nesterov47e65322006-03-28 16:11:25 -08001647}
1648
Ingo Molnar36c8b582006-07-03 00:25:41 -07001649static inline int thread_group_empty(struct task_struct *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650{
Oleg Nesterov47e65322006-03-28 16:11:25 -08001651 return list_empty(&p->thread_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652}
1653
1654#define delay_group_leader(p) \
1655 (thread_group_leader(p) && !thread_group_empty(p))
1656
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657/*
Eric W. Biederman260ea102006-06-23 02:05:18 -07001658 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
Jens Axboe22e2c502005-06-27 10:55:12 +02001659 * subscriptions and synchronises with wait4(). Also used in procfs. Also
Paul Jackson053199e2005-10-30 15:02:30 -08001660 * pins the final release of task.io_context. Also protects ->cpuset.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661 *
1662 * Nests both inside and outside of read_lock(&tasklist_lock).
1663 * It must not be nested with write_lock_irq(&tasklist_lock),
1664 * neither inside nor outside.
1665 */
1666static inline void task_lock(struct task_struct *p)
1667{
1668 spin_lock(&p->alloc_lock);
1669}
1670
1671static inline void task_unlock(struct task_struct *p)
1672{
1673 spin_unlock(&p->alloc_lock);
1674}
1675
Oleg Nesterovf63ee722006-03-28 16:11:13 -08001676extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1677 unsigned long *flags);
1678
1679static inline void unlock_task_sighand(struct task_struct *tsk,
1680 unsigned long *flags)
1681{
1682 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1683}
1684
Al Virof0373602005-11-13 16:06:57 -08001685#ifndef __HAVE_THREAD_FUNCTIONS
1686
Roman Zippelf7e42172007-05-09 02:35:17 -07001687#define task_thread_info(task) ((struct thread_info *)(task)->stack)
1688#define task_stack_page(task) ((task)->stack)
Al Viroa1261f52005-11-13 16:06:55 -08001689
Al Viro10ebffd2005-11-13 16:06:56 -08001690static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1691{
1692 *task_thread_info(p) = *task_thread_info(org);
1693 task_thread_info(p)->task = p;
1694}
1695
1696static inline unsigned long *end_of_stack(struct task_struct *p)
1697{
Roman Zippelf7e42172007-05-09 02:35:17 -07001698 return (unsigned long *)(task_thread_info(p) + 1);
Al Viro10ebffd2005-11-13 16:06:56 -08001699}
1700
Al Virof0373602005-11-13 16:06:57 -08001701#endif
1702
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703/* set thread flags in other task's structures
1704 * - see asm/thread_info.h for TIF_xxxx flags available
1705 */
1706static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1707{
Al Viroa1261f52005-11-13 16:06:55 -08001708 set_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709}
1710
1711static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1712{
Al Viroa1261f52005-11-13 16:06:55 -08001713 clear_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714}
1715
1716static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1717{
Al Viroa1261f52005-11-13 16:06:55 -08001718 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719}
1720
1721static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1722{
Al Viroa1261f52005-11-13 16:06:55 -08001723 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724}
1725
1726static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1727{
Al Viroa1261f52005-11-13 16:06:55 -08001728 return test_ti_thread_flag(task_thread_info(tsk), flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729}
1730
1731static inline void set_tsk_need_resched(struct task_struct *tsk)
1732{
1733 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1734}
1735
1736static inline void clear_tsk_need_resched(struct task_struct *tsk)
1737{
1738 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1739}
1740
1741static inline int signal_pending(struct task_struct *p)
1742{
1743 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1744}
1745
1746static inline int need_resched(void)
1747{
1748 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1749}
1750
1751/*
1752 * cond_resched() and cond_resched_lock(): latency reduction via
1753 * explicit rescheduling in places that are safe. The return
1754 * value indicates whether a reschedule was done in fact.
1755 * cond_resched_lock() will drop the spinlock before scheduling,
1756 * cond_resched_softirq() will enable bhs before scheduling.
1757 */
1758extern int cond_resched(void);
1759extern int cond_resched_lock(spinlock_t * lock);
1760extern int cond_resched_softirq(void);
1761
1762/*
1763 * Does a critical section need to be broken due to another
1764 * task waiting?:
1765 */
1766#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1767# define need_lockbreak(lock) ((lock)->break_lock)
1768#else
1769# define need_lockbreak(lock) 0
1770#endif
1771
1772/*
1773 * Does a critical section need to be broken due to another
1774 * task waiting or preemption being signalled:
1775 */
1776static inline int lock_need_resched(spinlock_t *lock)
1777{
1778 if (need_lockbreak(lock) || need_resched())
1779 return 1;
1780 return 0;
1781}
1782
Roland McGrath7bb44ad2007-05-23 13:57:44 -07001783/*
1784 * Reevaluate whether the task has signals pending delivery.
1785 * Wake the task if so.
1786 * This is required every time the blocked sigset_t changes.
1787 * callers must hold sighand->siglock.
1788 */
1789extern void recalc_sigpending_and_wake(struct task_struct *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790extern void recalc_sigpending(void);
1791
1792extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1793
1794/*
1795 * Wrappers for p->thread_info->cpu access. No-op on UP.
1796 */
1797#ifdef CONFIG_SMP
1798
1799static inline unsigned int task_cpu(const struct task_struct *p)
1800{
Al Viroa1261f52005-11-13 16:06:55 -08001801 return task_thread_info(p)->cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802}
1803
Ingo Molnarc65cc872007-07-09 18:51:58 +02001804extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805
1806#else
1807
1808static inline unsigned int task_cpu(const struct task_struct *p)
1809{
1810 return 0;
1811}
1812
1813static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1814{
1815}
1816
1817#endif /* CONFIG_SMP */
1818
1819#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1820extern void arch_pick_mmap_layout(struct mm_struct *mm);
1821#else
1822static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1823{
1824 mm->mmap_base = TASK_UNMAPPED_BASE;
1825 mm->get_unmapped_area = arch_get_unmapped_area;
1826 mm->unmap_area = arch_unmap_area;
1827}
1828#endif
1829
1830extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1831extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1832
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -07001833extern int sched_mc_power_savings, sched_smt_power_savings;
Siddha, Suresh B5c45bf22006-06-27 02:54:42 -07001834
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835extern void normalize_rt_tasks(void);
1836
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001837#ifdef CONFIG_TASK_XACCT
1838static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
1839{
1840 tsk->rchar += amt;
1841}
1842
1843static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
1844{
1845 tsk->wchar += amt;
1846}
1847
1848static inline void inc_syscr(struct task_struct *tsk)
1849{
1850 tsk->syscr++;
1851}
1852
1853static inline void inc_syscw(struct task_struct *tsk)
1854{
1855 tsk->syscw++;
1856}
1857#else
1858static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
1859{
1860}
1861
1862static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
1863{
1864}
1865
1866static inline void inc_syscr(struct task_struct *tsk)
1867{
1868}
1869
1870static inline void inc_syscw(struct task_struct *tsk)
1871{
1872}
1873#endif
1874
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875#endif /* __KERNEL__ */
1876
1877#endif