sched.h 68.8 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3
#ifndef _LINUX_SCHED_H
#define _LINUX_SCHED_H

4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/*
 * cloning flags:
 */
#define CSIGNAL		0x000000ff	/* signal mask to be sent at exit */
#define CLONE_VM	0x00000100	/* set if VM shared between processes */
#define CLONE_FS	0x00000200	/* set if fs info shared between processes */
#define CLONE_FILES	0x00000400	/* set if open files shared between processes */
#define CLONE_SIGHAND	0x00000800	/* set if signal handlers and blocked signals shared */
#define CLONE_PTRACE	0x00002000	/* set if we want to let tracing continue on the child too */
#define CLONE_VFORK	0x00004000	/* set if the parent wants the child to wake it up on mm_release */
#define CLONE_PARENT	0x00008000	/* set if we want to have the same parent as the cloner */
#define CLONE_THREAD	0x00010000	/* Same thread group? */
#define CLONE_NEWNS	0x00020000	/* New namespace group? */
#define CLONE_SYSVSEM	0x00040000	/* share system V SEM_UNDO semantics */
#define CLONE_SETTLS	0x00080000	/* create a new TLS for the child */
#define CLONE_PARENT_SETTID	0x00100000	/* set the TID in the parent */
#define CLONE_CHILD_CLEARTID	0x00200000	/* clear the TID in the child */
#define CLONE_DETACHED		0x00400000	/* Unused, ignored */
#define CLONE_UNTRACED		0x00800000	/* set if the tracing process can't force CLONE_PTRACE on this clone */
#define CLONE_CHILD_SETTID	0x01000000	/* set the TID in the child */
#define CLONE_STOPPED		0x02000000	/* Start in stopped state */
25
#define CLONE_NEWUTS		0x04000000	/* New utsname group? */
K
Kirill Korotaev 已提交
26
#define CLONE_NEWIPC		0x08000000	/* New ipcs */
S
Serge E. Hallyn 已提交
27
#define CLONE_NEWUSER		0x10000000	/* New user namespace */
28
#define CLONE_NEWPID		0x20000000	/* New pid namespace */
29
#define CLONE_NEWNET		0x40000000	/* New network namespace */
30
#define CLONE_IO		0x80000000	/* Clone io context */
31 32 33 34 35 36 37 38

/*
 * Scheduling policies
 */
#define SCHED_NORMAL		0
#define SCHED_FIFO		1
#define SCHED_RR		2
#define SCHED_BATCH		3
I
Ingo Molnar 已提交
39 40
/* SCHED_ISO: reserved but not implemented yet */
#define SCHED_IDLE		5
41

42
#ifdef __KERNEL__
43 44 45 46 47

struct sched_param {
	int sched_priority;
};

L
Linus Torvalds 已提交
48 49 50 51 52 53 54 55 56 57 58 59 60
#include <asm/param.h>	/* for HZ */

#include <linux/capability.h>
#include <linux/threads.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/timex.h>
#include <linux/jiffies.h>
#include <linux/rbtree.h>
#include <linux/thread_info.h>
#include <linux/cpumask.h>
#include <linux/errno.h>
#include <linux/nodemask.h>
61
#include <linux/mm_types.h>
L
Linus Torvalds 已提交
62 63 64 65 66 67 68 69 70 71 72 73 74 75 76

#include <asm/system.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/cputime.h>

#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/signal.h>
#include <linux/fs_struct.h>
#include <linux/compiler.h>
#include <linux/completion.h>
#include <linux/pid.h>
#include <linux/percpu.h>
#include <linux/topology.h>
P
Peter Zijlstra 已提交
77
#include <linux/proportions.h>
L
Linus Torvalds 已提交
78
#include <linux/seccomp.h>
I
Ingo Molnar 已提交
79
#include <linux/rcupdate.h>
I
Ingo Molnar 已提交
80
#include <linux/rtmutex.h>
L
Linus Torvalds 已提交
81

82 83 84 85 86
#include <linux/time.h>
#include <linux/param.h>
#include <linux/resource.h>
#include <linux/timer.h>
#include <linux/hrtimer.h>
87
#include <linux/task_io_accounting.h>
88
#include <linux/kobject.h>
A
Arjan van de Ven 已提交
89
#include <linux/latencytop.h>
90
#include <linux/cred.h>
91 92

#include <asm/processor.h>
H
H. J. Lu 已提交
93

94
struct mem_cgroup;
L
Linus Torvalds 已提交
95
struct exec_domain;
96
struct futex_pi_state;
97
struct robust_list_head;
98
struct bio;
99
struct bts_tracer;
L
Linus Torvalds 已提交
100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120

/*
 * List of flags we want to share for kernel threads,
 * if only because they are not used by them anyway.
 */
#define CLONE_KERNEL	(CLONE_FS | CLONE_FILES | CLONE_SIGHAND)

/*
 * These are the constant used to fake the fixed-point load-average
 * counting. Some notes:
 *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
 *    a load-average precision of 10 bits integer + 11 bits fractional
 *  - if you want to count load-averages more often, you need more
 *    precision, or rounding will get you. With 2-second counting freq,
 *    the EXP_n values would be 1981, 2034 and 2043 if still using only
 *    11 bit fractions.
 */
extern unsigned long avenrun[];		/* Load averages */

#define FSHIFT		11		/* nr of bits of precision */
#define FIXED_1		(1<<FSHIFT)	/* 1.0 as fixed-point */
121
#define LOAD_FREQ	(5*HZ+1)	/* 5 sec intervals */
L
Linus Torvalds 已提交
122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
#define EXP_1		1884		/* 1/exp(5sec/1min) as fixed-point */
#define EXP_5		2014		/* 1/exp(5sec/5min) */
#define EXP_15		2037		/* 1/exp(5sec/15min) */

#define CALC_LOAD(load,exp,n) \
	load *= exp; \
	load += n*(FIXED_1-exp); \
	load >>= FSHIFT;

extern unsigned long total_forks;
extern int nr_threads;
DECLARE_PER_CPU(unsigned long, process_counts);
extern int nr_processes(void);
extern unsigned long nr_running(void);
extern unsigned long nr_uninterruptible(void);
137
extern unsigned long nr_active(void);
L
Linus Torvalds 已提交
138 139
extern unsigned long nr_iowait(void);

I
Ingo Molnar 已提交
140 141
struct seq_file;
struct cfs_rq;
142
struct task_group;
I
Ingo Molnar 已提交
143 144 145 146
#ifdef CONFIG_SCHED_DEBUG
extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
extern void proc_sched_set_task(struct task_struct *p);
extern void
147
print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
I
Ingo Molnar 已提交
148 149 150 151 152 153 154 155 156
#else
static inline void
proc_sched_show_task(struct task_struct *p, struct seq_file *m)
{
}
static inline void proc_sched_set_task(struct task_struct *p)
{
}
static inline void
157
print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
I
Ingo Molnar 已提交
158 159 160
{
}
#endif
L
Linus Torvalds 已提交
161

162 163
extern unsigned long long time_sync_thresh;

164 165 166 167 168 169 170 171 172 173
/*
 * Task state bitmask. NOTE! These bits are also
 * encoded in fs/proc/array.c: get_task_state().
 *
 * We have two separate sets of flags: task->state
 * is about runnability, while task->exit_state are
 * about the task exiting. Confusing, but this way
 * modifying one set can't modify the other one by
 * mistake.
 */
L
Linus Torvalds 已提交
174 175 176
#define TASK_RUNNING		0
#define TASK_INTERRUPTIBLE	1
#define TASK_UNINTERRUPTIBLE	2
M
Matthew Wilcox 已提交
177 178
#define __TASK_STOPPED		4
#define __TASK_TRACED		8
179 180 181 182
/* in tsk->exit_state */
#define EXIT_ZOMBIE		16
#define EXIT_DEAD		32
/* in tsk->state again */
183
#define TASK_DEAD		64
M
Matthew Wilcox 已提交
184 185 186 187 188 189
#define TASK_WAKEKILL		128

/* Convenience macros for the sake of set_task_state */
#define TASK_KILLABLE		(TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
#define TASK_STOPPED		(TASK_WAKEKILL | __TASK_STOPPED)
#define TASK_TRACED		(TASK_WAKEKILL | __TASK_TRACED)
L
Linus Torvalds 已提交
190

191 192
/* Convenience macros for the sake of wake_up */
#define TASK_NORMAL		(TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
M
Matthew Wilcox 已提交
193
#define TASK_ALL		(TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
194 195 196

/* get_task_state() */
#define TASK_REPORT		(TASK_RUNNING | TASK_INTERRUPTIBLE | \
M
Matthew Wilcox 已提交
197 198
				 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
				 __TASK_TRACED)
199

M
Matthew Wilcox 已提交
200 201
#define task_is_traced(task)	((task->state & __TASK_TRACED) != 0)
#define task_is_stopped(task)	((task->state & __TASK_STOPPED) != 0)
202
#define task_is_stopped_or_traced(task)	\
M
Matthew Wilcox 已提交
203
			((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
204 205
#define task_contributes_to_load(task)	\
				((task->state & TASK_UNINTERRUPTIBLE) != 0)
L
Linus Torvalds 已提交
206 207 208 209 210 211

#define __set_task_state(tsk, state_value)		\
	do { (tsk)->state = (state_value); } while (0)
#define set_task_state(tsk, state_value)		\
	set_mb((tsk)->state, (state_value))

212 213 214 215 216 217 218 219 220 221 222
/*
 * set_current_state() includes a barrier so that the write of current->state
 * is correctly serialised wrt the caller's subsequent test of whether to
 * actually sleep:
 *
 *	set_current_state(TASK_UNINTERRUPTIBLE);
 *	if (do_i_need_to_sleep())
 *		schedule();
 *
 * If the caller does not need such serialisation then use __set_current_state()
 */
L
Linus Torvalds 已提交
223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241
#define __set_current_state(state_value)			\
	do { current->state = (state_value); } while (0)
#define set_current_state(state_value)		\
	set_mb(current->state, (state_value))

/* Task command name length */
#define TASK_COMM_LEN 16

#include <linux/spinlock.h>

/*
 * This serializes "schedule()" and also protects
 * the run-queue from deletions/modifications (but
 * _adding_ to the beginning of the run-queue has
 * a separate lock).
 */
extern rwlock_t tasklist_lock;
extern spinlock_t mmlist_lock;

242
struct task_struct;
L
Linus Torvalds 已提交
243 244 245

extern void sched_init(void);
extern void sched_init_smp(void);
246
extern asmlinkage void schedule_tail(struct task_struct *prev);
247
extern void init_idle(struct task_struct *idle, int cpu);
I
Ingo Molnar 已提交
248
extern void init_idle_bootup_task(struct task_struct *idle);
L
Linus Torvalds 已提交
249

I
Ingo Molnar 已提交
250
extern int runqueue_is_locked(void);
251
extern void task_rq_unlock_wait(struct task_struct *p);
I
Ingo Molnar 已提交
252

253
extern cpumask_var_t nohz_cpu_mask;
254 255 256 257 258 259 260 261
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
extern int select_nohz_load_balancer(int cpu);
#else
static inline int select_nohz_load_balancer(int cpu)
{
	return 0;
}
#endif
L
Linus Torvalds 已提交
262

I
Ingo Molnar 已提交
263
/*
I
Ingo Molnar 已提交
264
 * Only dump TASK_* tasks. (0 for all tasks)
I
Ingo Molnar 已提交
265 266 267 268 269
 */
extern void show_state_filter(unsigned long state_filter);

static inline void show_state(void)
{
I
Ingo Molnar 已提交
270
	show_state_filter(0);
I
Ingo Molnar 已提交
271 272
}

L
Linus Torvalds 已提交
273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289
extern void show_regs(struct pt_regs *);

/*
 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
 * task), SP is the stack pointer of the first frame that should be shown in the back
 * trace (or NULL if the entire call-chain of the task should be shown).
 */
extern void show_stack(struct task_struct *task, unsigned long *sp);

void io_schedule(void);
long io_schedule_timeout(long timeout);

extern void cpu_init (void);
extern void trap_init(void);
extern void update_process_times(int user);
extern void scheduler_tick(void);

290 291
extern void sched_show_task(struct task_struct *p);

I
Ingo Molnar 已提交
292
#ifdef CONFIG_DETECT_SOFTLOCKUP
293
extern void softlockup_tick(void);
I
Ingo Molnar 已提交
294
extern void touch_softlockup_watchdog(void);
295
extern void touch_all_softlockup_watchdogs(void);
296 297 298
extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
				    struct file *filp, void __user *buffer,
				    size_t *lenp, loff_t *ppos);
I
Ingo Molnar 已提交
299
extern unsigned int  softlockup_panic;
300 301
extern unsigned long sysctl_hung_task_check_count;
extern unsigned long sysctl_hung_task_timeout_secs;
I
Ingo Molnar 已提交
302
extern unsigned long sysctl_hung_task_warnings;
303
extern int softlockup_thresh;
I
Ingo Molnar 已提交
304
#else
305
static inline void softlockup_tick(void)
I
Ingo Molnar 已提交
306 307 308 309 310 311 312 313
{
}
static inline void spawn_softlockup_task(void)
{
}
static inline void touch_softlockup_watchdog(void)
{
}
314 315 316
static inline void touch_all_softlockup_watchdogs(void)
{
}
I
Ingo Molnar 已提交
317 318 319
#endif


L
Linus Torvalds 已提交
320 321
/* Attach to any functions which should be ignored in wchan output. */
#define __sched		__attribute__((__section__(".sched.text")))
322 323 324 325

/* Linker adds these: start and end of __sched functions */
extern char __sched_text_start[], __sched_text_end[];

L
Linus Torvalds 已提交
326 327 328 329
/* Is this address in the __sched functions? */
extern int in_sched_functions(unsigned long addr);

#define	MAX_SCHEDULE_TIMEOUT	LONG_MAX
330
extern signed long schedule_timeout(signed long timeout);
331
extern signed long schedule_timeout_interruptible(signed long timeout);
M
Matthew Wilcox 已提交
332
extern signed long schedule_timeout_killable(signed long timeout);
333
extern signed long schedule_timeout_uninterruptible(signed long timeout);
P
Peter Zijlstra 已提交
334
asmlinkage void __schedule(void);
L
Linus Torvalds 已提交
335
asmlinkage void schedule(void);
336
extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner);
L
Linus Torvalds 已提交
337

S
Serge E. Hallyn 已提交
338
struct nsproxy;
339
struct user_namespace;
L
Linus Torvalds 已提交
340 341 342 343 344 345 346 347 348 349 350 351 352 353 354

/* Maximum number of active map areas.. This is a random (large) number */
#define DEFAULT_MAX_MAP_COUNT	65536

extern int sysctl_max_map_count;

#include <linux/aio.h>

extern unsigned long
arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
		       unsigned long, unsigned long);
extern unsigned long
arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
			  unsigned long len, unsigned long pgoff,
			  unsigned long flags);
355 356
extern void arch_unmap_area(struct mm_struct *, unsigned long);
extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
L
Linus Torvalds 已提交
357

358
#if USE_SPLIT_PTLOCKS
359 360 361 362
/*
 * The mm counters are not protected by its page_table_lock,
 * so must be incremented atomically.
 */
363 364 365 366 367
#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
368

369
#else  /* !USE_SPLIT_PTLOCKS */
370 371 372 373
/*
 * The mm counters are protected by its page_table_lock,
 * so can be incremented directly.
 */
L
Linus Torvalds 已提交
374 375 376 377 378
#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
#define get_mm_counter(mm, member) ((mm)->_##member)
#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
#define inc_mm_counter(mm, member) (mm)->_##member++
#define dec_mm_counter(mm, member) (mm)->_##member--
379

380
#endif /* !USE_SPLIT_PTLOCKS */
381

382 383
#define get_mm_rss(mm)					\
	(get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
384 385 386 387 388 389 390 391 392 393
#define update_hiwater_rss(mm)	do {			\
	unsigned long _rss = get_mm_rss(mm);		\
	if ((mm)->hiwater_rss < _rss)			\
		(mm)->hiwater_rss = _rss;		\
} while (0)
#define update_hiwater_vm(mm)	do {			\
	if ((mm)->hiwater_vm < (mm)->total_vm)		\
		(mm)->hiwater_vm = (mm)->total_vm;	\
} while (0)

394 395 396
#define get_mm_hiwater_rss(mm)	max((mm)->hiwater_rss, get_mm_rss(mm))
#define get_mm_hiwater_vm(mm)	max((mm)->hiwater_vm, (mm)->total_vm)

397 398 399 400
extern void set_dumpable(struct mm_struct *mm, int value);
extern int get_dumpable(struct mm_struct *mm);

/* mm flags */
401
/* dumpable bits */
402 403
#define MMF_DUMPABLE      0  /* core dump is permitted */
#define MMF_DUMP_SECURELY 1  /* core file is readable only by root */
404 405 406 407 408 409 410
#define MMF_DUMPABLE_BITS 2

/* coredump filter bits */
#define MMF_DUMP_ANON_PRIVATE	2
#define MMF_DUMP_ANON_SHARED	3
#define MMF_DUMP_MAPPED_PRIVATE	4
#define MMF_DUMP_MAPPED_SHARED	5
R
Roland McGrath 已提交
411
#define MMF_DUMP_ELF_HEADERS	6
412 413
#define MMF_DUMP_HUGETLB_PRIVATE 7
#define MMF_DUMP_HUGETLB_SHARED  8
414
#define MMF_DUMP_FILTER_SHIFT	MMF_DUMPABLE_BITS
415
#define MMF_DUMP_FILTER_BITS	7
416 417 418
#define MMF_DUMP_FILTER_MASK \
	(((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
#define MMF_DUMP_FILTER_DEFAULT \
419
	((1 << MMF_DUMP_ANON_PRIVATE) |	(1 << MMF_DUMP_ANON_SHARED) |\
420 421 422 423 424 425 426
	 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)

#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
# define MMF_DUMP_MASK_DEFAULT_ELF	(1 << MMF_DUMP_ELF_HEADERS)
#else
# define MMF_DUMP_MASK_DEFAULT_ELF	0
#endif
427

L
Linus Torvalds 已提交
428 429 430 431
struct sighand_struct {
	atomic_t		count;
	struct k_sigaction	action[_NSIG];
	spinlock_t		siglock;
D
Davide Libenzi 已提交
432
	wait_queue_head_t	signalfd_wqh;
L
Linus Torvalds 已提交
433 434
};

435
struct pacct_struct {
436 437
	int			ac_flag;
	long			ac_exitcode;
438
	unsigned long		ac_mem;
439 440
	cputime_t		ac_utime, ac_stime;
	unsigned long		ac_minflt, ac_majflt;
441 442
};

443 444 445 446 447
/**
 * struct task_cputime - collected CPU time counts
 * @utime:		time spent in user mode, in &cputime_t units
 * @stime:		time spent in kernel mode, in &cputime_t units
 * @sum_exec_runtime:	total time spent on the CPU, in nanoseconds
448
 *
449 450 451 452 453 454 455 456 457 458 459 460 461 462 463
 * This structure groups together three kinds of CPU time that are
 * tracked for threads and thread groups.  Most things considering
 * CPU time want to group these counts together and treat all three
 * of them in parallel.
 */
struct task_cputime {
	cputime_t utime;
	cputime_t stime;
	unsigned long long sum_exec_runtime;
};
/* Alternate field names when used to cache expirations. */
#define prof_exp	stime
#define virt_exp	utime
#define sched_exp	sum_exec_runtime

464 465 466 467 468 469 470
#define INIT_CPUTIME	\
	(struct task_cputime) {					\
		.utime = cputime_zero,				\
		.stime = cputime_zero,				\
		.sum_exec_runtime = 0,				\
	}

471
/**
472 473 474 475 476
 * struct thread_group_cputimer - thread group interval timer counts
 * @cputime:		thread group interval timers.
 * @running:		non-zero when there are timers running and
 * 			@cputime receives updates.
 * @lock:		lock for fields in this struct.
477 478
 *
 * This structure contains the version of task_cputime, above, that is
479
 * used for thread group CPU timer calculations.
480
 */
481 482 483 484
struct thread_group_cputimer {
	struct task_cputime cputime;
	int running;
	spinlock_t lock;
485 486
};

L
Linus Torvalds 已提交
487 488 489 490 491 492 493 494 495 496 497 498 499 500
/*
 * NOTE! "signal_struct" does not have it's own
 * locking, because a shared signal_struct always
 * implies a shared sighand_struct, so locking
 * sighand_struct is always a proper superset of
 * the locking of signal_struct.
 */
struct signal_struct {
	atomic_t		count;
	atomic_t		live;

	wait_queue_head_t	wait_chldexit;	/* for wait4() */

	/* current thread group signal load-balancing target: */
501
	struct task_struct	*curr_target;
L
Linus Torvalds 已提交
502 503 504 505 506 507 508 509 510 511 512 513

	/* shared signal handling: */
	struct sigpending	shared_pending;

	/* thread group exit support */
	int			group_exit_code;
	/* overloaded:
	 * - notify group_exit_task when ->count is equal to notify_count
	 * - everyone except group_exit_task is stopped during signal delivery
	 *   of fatal signals, group_exit_task processes the signal.
	 */
	int			notify_count;
514
	struct task_struct	*group_exit_task;
L
Linus Torvalds 已提交
515 516 517 518 519 520 521 522 523

	/* thread group stop support, overloads group_exit_code too */
	int			group_stop_count;
	unsigned int		flags; /* see SIGNAL_* flags below */

	/* POSIX.1b Interval Timers */
	struct list_head posix_timers;

	/* ITIMER_REAL timer for the process */
524
	struct hrtimer real_timer;
525
	struct pid *leader_pid;
526
	ktime_t it_real_incr;
L
Linus Torvalds 已提交
527 528 529 530 531

	/* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
	cputime_t it_prof_expires, it_virt_expires;
	cputime_t it_prof_incr, it_virt_incr;

532
	/*
533 534
	 * Thread group totals for process CPU timers.
	 * See thread_group_cputimer(), et al, for details.
535
	 */
536
	struct thread_group_cputimer cputimer;
537 538 539 540 541 542

	/* Earliest-expiration cache. */
	struct task_cputime cputime_expires;

	struct list_head cpu_timers[3];

L
Linus Torvalds 已提交
543
	/* job control IDs */
544 545 546 547 548 549 550 551 552 553 554

	/*
	 * pgrp and session fields are deprecated.
	 * use the task_session_Xnr and task_pgrp_Xnr routines below
	 */

	union {
		pid_t pgrp __deprecated;
		pid_t __pgrp;
	};

555
	struct pid *tty_old_pgrp;
556 557 558 559 560 561

	union {
		pid_t session __deprecated;
		pid_t __session;
	};

L
Linus Torvalds 已提交
562 563 564 565 566 567 568 569 570 571 572
	/* boolean value for session group leader */
	int leader;

	struct tty_struct *tty; /* NULL if no tty */

	/*
	 * Cumulative resource counters for dead threads in the group,
	 * and for reaped dead child processes forked by this group.
	 * Live threads maintain their own counters and add to these
	 * in __exit_signal, except for the group leader.
	 */
573
	cputime_t utime, stime, cutime, cstime;
574 575
	cputime_t gtime;
	cputime_t cgtime;
L
Linus Torvalds 已提交
576 577
	unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
	unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
578
	unsigned long inblock, oublock, cinblock, coublock;
579
	struct task_io_accounting ioac;
L
Linus Torvalds 已提交
580

581 582 583 584 585 586 587 588
	/*
	 * Cumulative ns of schedule CPU time fo dead threads in the
	 * group, not including a zombie group leader, (This only differs
	 * from jiffies_to_ns(utime + stime) if sched_clock uses something
	 * other than jiffies.)
	 */
	unsigned long long sum_sched_runtime;

L
Linus Torvalds 已提交
589 590 591 592 593 594 595 596 597 598 599
	/*
	 * We don't bother to synchronize most readers of this at all,
	 * because there is no reader checking a limit that actually needs
	 * to get both rlim_cur and rlim_max atomically, and either one
	 * alone is a single word that can safely be read normally.
	 * getrlimit/setrlimit use task_lock(current->group_leader) to
	 * protect this instead of the siglock, because they really
	 * have no need to disable irqs.
	 */
	struct rlimit rlim[RLIM_NLIMITS];

600 601 602
#ifdef CONFIG_BSD_PROCESS_ACCT
	struct pacct_struct pacct;	/* per-process accounting information */
#endif
603 604 605
#ifdef CONFIG_TASKSTATS
	struct taskstats *stats;
#endif
M
Miloslav Trmac 已提交
606 607 608 609
#ifdef CONFIG_AUDIT
	unsigned audit_tty;
	struct tty_audit_buf *tty_audit_buf;
#endif
L
Linus Torvalds 已提交
610 611
};

612 613 614 615 616
/* Context switch must be unlocked if interrupts are to be enabled */
#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
# define __ARCH_WANT_UNLOCKED_CTXSW
#endif

L
Linus Torvalds 已提交
617 618 619 620 621 622 623
/*
 * Bits in flags field of signal_struct.
 */
#define SIGNAL_STOP_STOPPED	0x00000001 /* job control stop in effect */
#define SIGNAL_STOP_DEQUEUED	0x00000002 /* stop signal dequeued */
#define SIGNAL_STOP_CONTINUED	0x00000004 /* SIGCONT since WCONTINUED reap */
#define SIGNAL_GROUP_EXIT	0x00000008 /* group exit in progress */
624 625 626 627 628 629
/*
 * Pending notifications to parent.
 */
#define SIGNAL_CLD_STOPPED	0x00000010
#define SIGNAL_CLD_CONTINUED	0x00000020
#define SIGNAL_CLD_MASK		(SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
L
Linus Torvalds 已提交
630

631 632
#define SIGNAL_UNKILLABLE	0x00000040 /* for init: ignore fatal signals */

633 634 635 636 637 638 639
/* If true, all threads except ->group_exit_task have pending SIGKILL */
static inline int signal_group_exit(const struct signal_struct *sig)
{
	return	(sig->flags & SIGNAL_GROUP_EXIT) ||
		(sig->group_exit_task != NULL);
}

L
Linus Torvalds 已提交
640 641 642 643 644 645 646 647
/*
 * Some day this will be a full-fledged user tracking system..
 */
struct user_struct {
	atomic_t __count;	/* reference count */
	atomic_t processes;	/* How many processes does this user have? */
	atomic_t files;		/* How many open files does this user have? */
	atomic_t sigpending;	/* How many pending signals does this user have? */
648
#ifdef CONFIG_INOTIFY_USER
R
Robert Love 已提交
649 650 651
	atomic_t inotify_watches; /* How many inotify watches does this user have? */
	atomic_t inotify_devs;	/* How many inotify devs does this user have opened? */
#endif
652 653 654
#ifdef CONFIG_EPOLL
	atomic_t epoll_watches;	/* The number of file descriptors currently watched */
#endif
A
Alexey Dobriyan 已提交
655
#ifdef CONFIG_POSIX_MQUEUE
L
Linus Torvalds 已提交
656 657
	/* protected by mq_lock	*/
	unsigned long mq_bytes;	/* How many bytes can be allocated to mqueue? */
A
Alexey Dobriyan 已提交
658
#endif
L
Linus Torvalds 已提交
659 660 661 662 663 664 665 666
	unsigned long locked_shm; /* How many pages of mlocked shm ? */

#ifdef CONFIG_KEYS
	struct key *uid_keyring;	/* UID specific keyring */
	struct key *session_keyring;	/* UID's default session keyring */
#endif

	/* Hash table maintenance information */
P
Pavel Emelyanov 已提交
667
	struct hlist_node uidhash_node;
L
Linus Torvalds 已提交
668
	uid_t uid;
669
	struct user_namespace *user_ns;
670

671
#ifdef CONFIG_USER_SCHED
672
	struct task_group *tg;
D
Dhaval Giani 已提交
673
#ifdef CONFIG_SYSFS
674
	struct kobject kobj;
675
	struct work_struct work;
676
#endif
D
Dhaval Giani 已提交
677
#endif
L
Linus Torvalds 已提交
678 679
};

680
extern int uids_sysfs_init(void);
681

L
Linus Torvalds 已提交
682 683 684 685 686
extern struct user_struct *find_user(uid_t);

extern struct user_struct root_user;
#define INIT_USER (&root_user)

687

L
Linus Torvalds 已提交
688 689 690
struct backing_dev_info;
struct reclaim_state;

691
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
L
Linus Torvalds 已提交
692 693
struct sched_info {
	/* cumulative counters */
694
	unsigned long pcount;	      /* # of times run on this cpu */
695
	unsigned long long run_delay; /* time spent waiting on a runqueue */
L
Linus Torvalds 已提交
696 697

	/* timestamps */
698 699
	unsigned long long last_arrival,/* when we last ran on a cpu */
			   last_queued;	/* when we were last queued to run */
I
Ingo Molnar 已提交
700 701
#ifdef CONFIG_SCHEDSTATS
	/* BKL stats */
702
	unsigned int bkl_count;
I
Ingo Molnar 已提交
703
#endif
L
Linus Torvalds 已提交
704
};
705
#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
L
Linus Torvalds 已提交
706

707 708 709 710 711 712 713 714 715 716 717 718 719 720
#ifdef CONFIG_TASK_DELAY_ACCT
struct task_delay_info {
	spinlock_t	lock;
	unsigned int	flags;	/* Private per-task flags */

	/* For each stat XXX, add following, aligned appropriately
	 *
	 * struct timespec XXX_start, XXX_end;
	 * u64 XXX_delay;
	 * u32 XXX_count;
	 *
	 * Atomicity of updates to XXX_delay, XXX_count protected by
	 * single lock above (split into XXX_lock if contention is an issue).
	 */
721 722 723 724 725 726 727 728 729 730 731 732 733

	/*
	 * XXX_count is incremented on every XXX operation, the delay
	 * associated with the operation is added to XXX_delay.
	 * XXX_delay contains the accumulated delay time in nanoseconds.
	 */
	struct timespec blkio_start, blkio_end;	/* Shared by blkio, swapin */
	u64 blkio_delay;	/* wait for sync block io completion */
	u64 swapin_delay;	/* wait for swapin block io completion */
	u32 blkio_count;	/* total count of the number of sync block */
				/* io operations performed */
	u32 swapin_count;	/* total count of the number of swapin block */
				/* io operations performed */
734 735 736 737

	struct timespec freepages_start, freepages_end;
	u64 freepages_delay;	/* wait for memory reclaim */
	u32 freepages_count;	/* total count of memory reclaim */
738
};
739 740 741 742 743 744 745 746 747 748 749
#endif	/* CONFIG_TASK_DELAY_ACCT */

static inline int sched_info_on(void)
{
#ifdef CONFIG_SCHEDSTATS
	return 1;
#elif defined(CONFIG_TASK_DELAY_ACCT)
	extern int delayacct_on;
	return delayacct_on;
#else
	return 0;
750
#endif
751
}
752

I
Ingo Molnar 已提交
753 754 755 756 757
enum cpu_idle_type {
	CPU_IDLE,
	CPU_NOT_IDLE,
	CPU_NEWLY_IDLE,
	CPU_MAX_IDLE_TYPES
L
Linus Torvalds 已提交
758 759 760 761 762
};

/*
 * sched-domains (multiprocessor balancing) declarations:
 */
763 764 765 766 767 768 769

/*
 * Increase resolution of nice-level calculations:
 */
#define SCHED_LOAD_SHIFT	10
#define SCHED_LOAD_SCALE	(1L << SCHED_LOAD_SHIFT)

770
#define SCHED_LOAD_SCALE_FUZZ	SCHED_LOAD_SCALE
L
Linus Torvalds 已提交
771

772
#ifdef CONFIG_SMP
L
Linus Torvalds 已提交
773 774 775
#define SD_LOAD_BALANCE		1	/* Do load balancing on this domain. */
#define SD_BALANCE_NEWIDLE	2	/* Balance when about to become idle */
#define SD_BALANCE_EXEC		4	/* Balance on exec */
N
Nick Piggin 已提交
776 777 778 779 780
#define SD_BALANCE_FORK		8	/* Balance on fork, clone */
#define SD_WAKE_IDLE		16	/* Wake to idle CPU on task wakeup */
#define SD_WAKE_AFFINE		32	/* Wake task to waking CPU */
#define SD_WAKE_BALANCE		64	/* Perform balancing at task wakeup */
#define SD_SHARE_CPUPOWER	128	/* Domain members share cpu power */
781
#define SD_POWERSAVINGS_BALANCE	256	/* Balance for power savings */
782
#define SD_SHARE_PKG_RESOURCES	512	/* Domain members share cpu pkg resources */
783
#define SD_SERIALIZE		1024	/* Only a single load balancing instance */
784
#define SD_WAKE_IDLE_FAR	2048	/* Gain latency sacrificing cache hit */
785

786 787 788 789 790 791 792 793 794 795
enum powersavings_balance_level {
	POWERSAVINGS_BALANCE_NONE = 0,  /* No power saving load balance */
	POWERSAVINGS_BALANCE_BASIC,	/* Fill one thread/core/package
					 * first for long running threads
					 */
	POWERSAVINGS_BALANCE_WAKEUP,	/* Also bias task wakeups to semi-idle
					 * cpu package for power savings
					 */
	MAX_POWERSAVINGS_BALANCE_LEVELS
};
796

797
extern int sched_mc_power_savings, sched_smt_power_savings;
798

799 800 801 802
static inline int sd_balance_for_mc_power(void)
{
	if (sched_smt_power_savings)
		return SD_POWERSAVINGS_BALANCE;
803

804 805
	return 0;
}
806

807 808 809 810 811 812 813
static inline int sd_balance_for_package_power(void)
{
	if (sched_mc_power_savings | sched_smt_power_savings)
		return SD_POWERSAVINGS_BALANCE;

	return 0;
}
814

815 816 817 818 819 820 821 822 823 824 825 826 827
/*
 * Optimise SD flags for power savings:
 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
 * Keep default SD flags if sched_{smt,mc}_power_saving=0
 */

static inline int sd_power_saving_flags(void)
{
	if (sched_mc_power_savings | sched_smt_power_savings)
		return SD_BALANCE_NEWIDLE;

	return 0;
}
L
Linus Torvalds 已提交
828 829 830 831 832 833 834

struct sched_group {
	struct sched_group *next;	/* Must be a circular list */

	/*
	 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
	 * single CPU. This is read only (except for setup, hotplug CPU).
835
	 * Note : Never change cpu_power without recompute its reciprocal
L
Linus Torvalds 已提交
836
	 */
837 838 839 840 841 842
	unsigned int __cpu_power;
	/*
	 * reciprocal value of cpu_power to avoid expensive divides
	 * (see include/linux/reciprocal_div.h)
	 */
	u32 reciprocal_cpu_power;
843 844

	unsigned long cpumask[];
L
Linus Torvalds 已提交
845 846
};

847 848
static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
{
849
	return to_cpumask(sg->cpumask);
850 851
}

852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869
enum sched_domain_level {
	SD_LV_NONE = 0,
	SD_LV_SIBLING,
	SD_LV_MC,
	SD_LV_CPU,
	SD_LV_NODE,
	SD_LV_ALLNODES,
	SD_LV_MAX
};

struct sched_domain_attr {
	int relax_domain_level;
};

#define SD_ATTR_INIT	(struct sched_domain_attr) {	\
	.relax_domain_level = -1,			\
}

L
Linus Torvalds 已提交
870 871 872
struct sched_domain {
	/* These fields must be setup */
	struct sched_domain *parent;	/* top domain must be null terminated */
873
	struct sched_domain *child;	/* bottom domain must be null terminated */
L
Linus Torvalds 已提交
874 875 876 877 878 879
	struct sched_group *groups;	/* the balancing groups of the domain */
	unsigned long min_interval;	/* Minimum balance interval ms */
	unsigned long max_interval;	/* Maximum balance interval ms */
	unsigned int busy_factor;	/* less balancing by factor if busy */
	unsigned int imbalance_pct;	/* No balance until over watermark */
	unsigned int cache_nice_tries;	/* Leave cache hot tasks for # tries */
N
Nick Piggin 已提交
880 881 882 883
	unsigned int busy_idx;
	unsigned int idle_idx;
	unsigned int newidle_idx;
	unsigned int wake_idx;
N
Nick Piggin 已提交
884
	unsigned int forkexec_idx;
L
Linus Torvalds 已提交
885
	int flags;			/* See SD_* */
886
	enum sched_domain_level level;
L
Linus Torvalds 已提交
887 888 889 890 891 892

	/* Runtime fields. */
	unsigned long last_balance;	/* init to jiffies. units in jiffies */
	unsigned int balance_interval;	/* initialise to 1. units in ms. */
	unsigned int nr_balance_failed; /* initialise to 0 */

P
Peter Zijlstra 已提交
893 894
	u64 last_update;

L
Linus Torvalds 已提交
895 896
#ifdef CONFIG_SCHEDSTATS
	/* load_balance() stats */
897 898 899 900 901 902 903 904
	unsigned int lb_count[CPU_MAX_IDLE_TYPES];
	unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
	unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
	unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
	unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
	unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
	unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
	unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
L
Linus Torvalds 已提交
905 906

	/* Active load balancing */
907 908 909
	unsigned int alb_count;
	unsigned int alb_failed;
	unsigned int alb_pushed;
L
Linus Torvalds 已提交
910

911
	/* SD_BALANCE_EXEC stats */
912 913 914
	unsigned int sbe_count;
	unsigned int sbe_balanced;
	unsigned int sbe_pushed;
L
Linus Torvalds 已提交
915

916
	/* SD_BALANCE_FORK stats */
917 918 919
	unsigned int sbf_count;
	unsigned int sbf_balanced;
	unsigned int sbf_pushed;
920

L
Linus Torvalds 已提交
921
	/* try_to_wake_up() stats */
922 923 924
	unsigned int ttwu_wake_remote;
	unsigned int ttwu_move_affine;
	unsigned int ttwu_move_balance;
L
Linus Torvalds 已提交
925
#endif
926 927 928
#ifdef CONFIG_SCHED_DEBUG
	char *name;
#endif
929 930 931

	/* span of all CPUs in this domain */
	unsigned long span[];
L
Linus Torvalds 已提交
932 933
};

934 935
static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
{
936
	return to_cpumask(sd->span);
937 938
}

939
extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
940
				    struct sched_domain_attr *dattr_new);
P
Paul Jackson 已提交
941

942 943 944 945 946 947 948 949 950
/* Test a flag in parent sched domain */
static inline int test_sd_parent(struct sched_domain *sd, int flag)
{
	if (sd->parent && (sd->parent->flags & flag))
		return 1;

	return 0;
}

951 952 953 954 955
#else /* CONFIG_SMP */

struct sched_domain_attr;

static inline void
956
partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
957 958 959 960
			struct sched_domain_attr *dattr_new)
{
}
#endif	/* !CONFIG_SMP */
L
Linus Torvalds 已提交
961 962 963 964

struct io_context;			/* See blkdev.h */


965
#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
966
extern void prefetch_stack(struct task_struct *t);
967 968 969
#else
static inline void prefetch_stack(struct task_struct *t) { }
#endif
L
Linus Torvalds 已提交
970 971 972

struct audit_context;		/* See audit.c */
struct mempolicy;
973
struct pipe_inode_info;
974
struct uts_namespace;
L
Linus Torvalds 已提交
975

I
Ingo Molnar 已提交
976 977 978 979
struct rq;
struct sched_domain;

struct sched_class {
980
	const struct sched_class *next;
I
Ingo Molnar 已提交
981

982
	void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
983
	void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
984
	void (*yield_task) (struct rq *rq);
I
Ingo Molnar 已提交
985

986
	void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
I
Ingo Molnar 已提交
987

988
	struct task_struct * (*pick_next_task) (struct rq *rq);
989
	void (*put_prev_task) (struct rq *rq, struct task_struct *p);
I
Ingo Molnar 已提交
990

991
#ifdef CONFIG_SMP
L
Li Zefan 已提交
992 993
	int  (*select_task_rq)(struct task_struct *p, int sync);

P
Peter Williams 已提交
994
	unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
995
			struct rq *busiest, unsigned long max_load_move,
I
Ingo Molnar 已提交
996
			struct sched_domain *sd, enum cpu_idle_type idle,
997
			int *all_pinned, int *this_best_prio);
I
Ingo Molnar 已提交
998

999 1000 1001
	int (*move_one_task) (struct rq *this_rq, int this_cpu,
			      struct rq *busiest, struct sched_domain *sd,
			      enum cpu_idle_type idle);
1002
	void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1003
	int (*needs_post_schedule) (struct rq *this_rq);
1004 1005
	void (*post_schedule) (struct rq *this_rq);
	void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
1006

1007
	void (*set_cpus_allowed)(struct task_struct *p,
1008
				 const struct cpumask *newmask);
G
Gregory Haskins 已提交
1009

1010 1011
	void (*rq_online)(struct rq *rq);
	void (*rq_offline)(struct rq *rq);
L
Li Zefan 已提交
1012 1013 1014 1015 1016
#endif

	void (*set_curr_task) (struct rq *rq);
	void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
	void (*task_new) (struct rq *rq, struct task_struct *p);
1017 1018 1019 1020 1021 1022 1023

	void (*switched_from) (struct rq *this_rq, struct task_struct *task,
			       int running);
	void (*switched_to) (struct rq *this_rq, struct task_struct *task,
			     int running);
	void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
			     int oldprio, int running);
P
Peter Zijlstra 已提交
1024 1025 1026 1027

#ifdef CONFIG_FAIR_GROUP_SCHED
	void (*moved_group) (struct task_struct *p);
#endif
I
Ingo Molnar 已提交
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046
};

struct load_weight {
	unsigned long weight, inv_weight;
};

/*
 * CFS stats for a schedulable entity (task, task-group etc)
 *
 * Current field usage histogram:
 *
 *     4 se->block_start
 *     4 se->run_node
 *     4 se->sleep_start
 *     6 se->load.weight
 */
struct sched_entity {
	struct load_weight	load;		/* for load-balancing */
	struct rb_node		run_node;
1047
	struct list_head	group_node;
I
Ingo Molnar 已提交
1048 1049
	unsigned int		on_rq;

1050 1051
	u64			exec_start;
	u64			sum_exec_runtime;
I
Ingo Molnar 已提交
1052
	u64			vruntime;
1053
	u64			prev_sum_exec_runtime;
1054

I
Ingo Molnar 已提交
1055 1056 1057
	u64			last_wakeup;
	u64			avg_overlap;

1058 1059 1060 1061
	u64			start_runtime;
	u64			avg_wakeup;
	u64			nr_migrations;

1062
#ifdef CONFIG_SCHEDSTATS
I
Ingo Molnar 已提交
1063
	u64			wait_start;
1064
	u64			wait_max;
1065 1066
	u64			wait_count;
	u64			wait_sum;
1067

I
Ingo Molnar 已提交
1068 1069
	u64			sleep_start;
	u64			sleep_max;
1070 1071 1072
	s64			sum_sleep_runtime;

	u64			block_start;
I
Ingo Molnar 已提交
1073 1074
	u64			block_max;
	u64			exec_max;
I
Ingo Molnar 已提交
1075
	u64			slice_max;
1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092

	u64			nr_migrations_cold;
	u64			nr_failed_migrations_affine;
	u64			nr_failed_migrations_running;
	u64			nr_failed_migrations_hot;
	u64			nr_forced_migrations;
	u64			nr_forced2_migrations;

	u64			nr_wakeups;
	u64			nr_wakeups_sync;
	u64			nr_wakeups_migrate;
	u64			nr_wakeups_local;
	u64			nr_wakeups_remote;
	u64			nr_wakeups_affine;
	u64			nr_wakeups_affine_attempts;
	u64			nr_wakeups_passive;
	u64			nr_wakeups_idle;
1093 1094
#endif

I
Ingo Molnar 已提交
1095 1096 1097 1098 1099 1100 1101 1102
#ifdef CONFIG_FAIR_GROUP_SCHED
	struct sched_entity	*parent;
	/* rq on which this entity is (to be) queued: */
	struct cfs_rq		*cfs_rq;
	/* rq "owned" by this entity/group: */
	struct cfs_rq		*my_q;
#endif
};
1103

P
Peter Zijlstra 已提交
1104 1105
struct sched_rt_entity {
	struct list_head run_list;
1106
	unsigned long timeout;
1107
	unsigned int time_slice;
P
Peter Zijlstra 已提交
1108 1109
	int nr_cpus_allowed;

1110
	struct sched_rt_entity *back;
1111
#ifdef CONFIG_RT_GROUP_SCHED
P
Peter Zijlstra 已提交
1112 1113 1114 1115 1116 1117
	struct sched_rt_entity	*parent;
	/* rq on which this entity is (to be) queued: */
	struct rt_rq		*rt_rq;
	/* rq "owned" by this entity/group: */
	struct rt_rq		*my_q;
#endif
P
Peter Zijlstra 已提交
1118 1119
};

L
Linus Torvalds 已提交
1120 1121
struct task_struct {
	volatile long state;	/* -1 unrunnable, 0 runnable, >0 stopped */
R
Roman Zippel 已提交
1122
	void *stack;
L
Linus Torvalds 已提交
1123
	atomic_t usage;
1124 1125
	unsigned int flags;	/* per process flags, defined below */
	unsigned int ptrace;
L
Linus Torvalds 已提交
1126

1127
	int lock_depth;		/* BKL lock depth */
L
Linus Torvalds 已提交
1128

1129 1130
#ifdef CONFIG_SMP
#ifdef __ARCH_WANT_UNLOCKED_CTXSW
1131 1132
	int oncpu;
#endif
1133
#endif
1134

1135
	int prio, static_prio, normal_prio;
1136
	unsigned int rt_priority;
1137
	const struct sched_class *sched_class;
I
Ingo Molnar 已提交
1138
	struct sched_entity se;
P
Peter Zijlstra 已提交
1139
	struct sched_rt_entity rt;
L
Linus Torvalds 已提交
1140

1141 1142 1143 1144 1145
#ifdef CONFIG_PREEMPT_NOTIFIERS
	/* list of struct preempt_notifier: */
	struct hlist_head preempt_notifiers;
#endif

1146 1147 1148 1149 1150 1151 1152 1153 1154 1155
	/*
	 * fpu_counter contains the number of consecutive context switches
	 * that the FPU is used. If this is over a threshold, the lazy fpu
	 * saving becomes unlazy to save the trap. This is an unsigned char
	 * so that after 256 times the counter wraps and the behavior turns
	 * lazy again; this to deal with bursty apps that only use FPU for
	 * a short time
	 */
	unsigned char fpu_counter;
	s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
1156
#ifdef CONFIG_BLK_DEV_IO_TRACE
1157
	unsigned int btrace_seq;
1158
#endif
L
Linus Torvalds 已提交
1159

1160
	unsigned int policy;
L
Linus Torvalds 已提交
1161 1162
	cpumask_t cpus_allowed;

P
Paul E. McKenney 已提交
1163 1164 1165 1166 1167
#ifdef CONFIG_PREEMPT_RCU
	int rcu_read_lock_nesting;
	int rcu_flipctr_idx;
#endif /* #ifdef CONFIG_PREEMPT_RCU */

1168
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
L
Linus Torvalds 已提交
1169 1170 1171 1172
	struct sched_info sched_info;
#endif

	struct list_head tasks;
1173
	struct plist_node pushable_tasks;
L
Linus Torvalds 已提交
1174 1175 1176 1177 1178

	struct mm_struct *mm, *active_mm;

/* task state */
	struct linux_binfmt *binfmt;
1179
	int exit_state;
L
Linus Torvalds 已提交
1180 1181 1182
	int exit_code, exit_signal;
	int pdeath_signal;  /*  The signal sent when the parent dies  */
	/* ??? */
1183
	unsigned int personality;
L
Linus Torvalds 已提交
1184
	unsigned did_exec:1;
1185 1186
	unsigned in_execve:1;	/* Tell the LSMs that the process is doing an
				 * execve */
L
Linus Torvalds 已提交
1187 1188
	pid_t pid;
	pid_t tgid;
1189 1190 1191

	/* Canary value for the -fstack-protector gcc feature */
	unsigned long stack_canary;
1192

L
Linus Torvalds 已提交
1193 1194 1195
	/* 
	 * pointers to (original) parent process, youngest child, younger sibling,
	 * older sibling, respectively.  (p->father can be replaced with 
R
Roland McGrath 已提交
1196
	 * p->real_parent->pid)
L
Linus Torvalds 已提交
1197
	 */
R
Roland McGrath 已提交
1198 1199
	struct task_struct *real_parent; /* real parent process */
	struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
L
Linus Torvalds 已提交
1200
	/*
R
Roland McGrath 已提交
1201
	 * children/sibling forms the list of my natural children
L
Linus Torvalds 已提交
1202 1203 1204 1205 1206
	 */
	struct list_head children;	/* list of my children */
	struct list_head sibling;	/* linkage in my parent's children list */
	struct task_struct *group_leader;	/* threadgroup leader */

R
Roland McGrath 已提交
1207 1208 1209 1210 1211 1212 1213 1214
	/*
	 * ptraced is the list of tasks this task is using ptrace on.
	 * This includes both natural children and PTRACE_ATTACH targets.
	 * p->ptrace_entry is p's link on the p->parent->ptraced list.
	 */
	struct list_head ptraced;
	struct list_head ptrace_entry;

1215 1216 1217 1218 1219 1220
#ifdef CONFIG_X86_PTRACE_BTS
	/*
	 * This is the tracer handle for the ptrace BTS extension.
	 * This field actually belongs to the ptracer task.
	 */
	struct bts_tracer *bts;
1221 1222 1223 1224
	/*
	 * The buffer to hold the BTS data.
	 */
	void *bts_buffer;
1225
	size_t bts_size;
1226 1227
#endif /* CONFIG_X86_PTRACE_BTS */

L
Linus Torvalds 已提交
1228
	/* PID/PID hash table linkage. */
1229
	struct pid_link pids[PIDTYPE_MAX];
O
Oleg Nesterov 已提交
1230
	struct list_head thread_group;
L
Linus Torvalds 已提交
1231 1232 1233 1234 1235

	struct completion *vfork_done;		/* for vfork() */
	int __user *set_child_tid;		/* CLONE_CHILD_SETTID */
	int __user *clear_child_tid;		/* CLONE_CHILD_CLEARTID */

1236
	cputime_t utime, stime, utimescaled, stimescaled;
1237
	cputime_t gtime;
1238
	cputime_t prev_utime, prev_stime;
L
Linus Torvalds 已提交
1239
	unsigned long nvcsw, nivcsw; /* context switch counts */
1240 1241
	struct timespec start_time; 		/* monotonic time */
	struct timespec real_start_time;	/* boot based time */
L
Linus Torvalds 已提交
1242 1243 1244
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
	unsigned long min_flt, maj_flt;

1245
	struct task_cputime cputime_expires;
L
Linus Torvalds 已提交
1246 1247 1248
	struct list_head cpu_timers[3];

/* process credentials */
1249 1250 1251 1252
	const struct cred *real_cred;	/* objective and real subjective task
					 * credentials (COW) */
	const struct cred *cred;	/* effective (overridable) subjective task
					 * credentials (COW) */
D
David Howells 已提交
1253
	struct mutex cred_exec_mutex;	/* execve vs ptrace cred calculation mutex */
1254

1255 1256 1257 1258
	char comm[TASK_COMM_LEN]; /* executable name excluding path
				     - access with [gs]et_task_comm (which lock
				       it with task_lock())
				     - initialized normally by flush_old_exec */
L
Linus Torvalds 已提交
1259 1260
/* file system info */
	int link_count, total_link_count;
1261
#ifdef CONFIG_SYSVIPC
L
Linus Torvalds 已提交
1262 1263
/* ipc stuff */
	struct sysv_sem sysvsem;
1264
#endif
1265 1266 1267 1268 1269
#ifdef CONFIG_DETECT_SOFTLOCKUP
/* hung task detection */
	unsigned long last_switch_timestamp;
	unsigned long last_switch_count;
#endif
L
Linus Torvalds 已提交
1270 1271 1272 1273 1274 1275
/* CPU-specific state of this task */
	struct thread_struct thread;
/* filesystem information */
	struct fs_struct *fs;
/* open file information */
	struct files_struct *files;
1276
/* namespaces */
S
Serge E. Hallyn 已提交
1277
	struct nsproxy *nsproxy;
L
Linus Torvalds 已提交
1278 1279 1280 1281 1282
/* signal handlers */
	struct signal_struct *signal;
	struct sighand_struct *sighand;

	sigset_t blocked, real_blocked;
1283
	sigset_t saved_sigmask;	/* restored if set_restore_sigmask() was used */
L
Linus Torvalds 已提交
1284 1285 1286 1287 1288 1289 1290 1291
	struct sigpending pending;

	unsigned long sas_ss_sp;
	size_t sas_ss_size;
	int (*notifier)(void *priv);
	void *notifier_data;
	sigset_t *notifier_mask;
	struct audit_context *audit_context;
A
Al Viro 已提交
1292 1293
#ifdef CONFIG_AUDITSYSCALL
	uid_t loginuid;
1294
	unsigned int sessionid;
A
Al Viro 已提交
1295
#endif
L
Linus Torvalds 已提交
1296 1297 1298 1299 1300 1301 1302 1303
	seccomp_t seccomp;

/* Thread group tracking */
   	u32 parent_exec_id;
   	u32 self_exec_id;
/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
	spinlock_t alloc_lock;

1304 1305 1306
	/* Protection of the PI data structures: */
	spinlock_t pi_lock;

I
Ingo Molnar 已提交
1307 1308 1309 1310 1311 1312 1313
#ifdef CONFIG_RT_MUTEXES
	/* PI waiters blocked on a rt_mutex held by this task */
	struct plist_head pi_waiters;
	/* Deadlock detection and priority inheritance handling */
	struct rt_mutex_waiter *pi_blocked_on;
#endif

1314 1315 1316 1317
#ifdef CONFIG_DEBUG_MUTEXES
	/* mutex deadlock detection */
	struct mutex_waiter *blocked_on;
#endif
1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
#ifdef CONFIG_TRACE_IRQFLAGS
	unsigned int irq_events;
	int hardirqs_enabled;
	unsigned long hardirq_enable_ip;
	unsigned int hardirq_enable_event;
	unsigned long hardirq_disable_ip;
	unsigned int hardirq_disable_event;
	int softirqs_enabled;
	unsigned long softirq_disable_ip;
	unsigned int softirq_disable_event;
	unsigned long softirq_enable_ip;
	unsigned int softirq_enable_event;
	int hardirq_context;
	int softirq_context;
#endif
I
Ingo Molnar 已提交
1333
#ifdef CONFIG_LOCKDEP
1334
# define MAX_LOCK_DEPTH 48UL
I
Ingo Molnar 已提交
1335 1336 1337
	u64 curr_chain_key;
	int lockdep_depth;
	unsigned int lockdep_recursion;
1338
	struct held_lock held_locks[MAX_LOCK_DEPTH];
1339
	gfp_t lockdep_reclaim_gfp;
I
Ingo Molnar 已提交
1340
#endif
1341

L
Linus Torvalds 已提交
1342 1343 1344
/* journalling filesystem info */
	void *journal_info;

1345 1346 1347
/* stacked block device info */
	struct bio *bio_list, **bio_tail;

L
Linus Torvalds 已提交
1348 1349 1350 1351 1352 1353 1354 1355 1356
/* VM state */
	struct reclaim_state *reclaim_state;

	struct backing_dev_info *backing_dev_info;

	struct io_context *io_context;

	unsigned long ptrace_message;
	siginfo_t *last_siginfo; /* For ptrace use.  */
1357
	struct task_io_accounting ioac;
1358
#if defined(CONFIG_TASK_XACCT)
L
Linus Torvalds 已提交
1359 1360
	u64 acct_rss_mem1;	/* accumulated rss usage */
	u64 acct_vm_mem1;	/* accumulated virtual memory usage */
1361
	cputime_t acct_timexpd;	/* stime + utime since last update */
L
Linus Torvalds 已提交
1362 1363 1364 1365
#endif
#ifdef CONFIG_CPUSETS
	nodemask_t mems_allowed;
	int cpuset_mems_generation;
1366
	int cpuset_mem_spread_rotor;
L
Linus Torvalds 已提交
1367
#endif
1368
#ifdef CONFIG_CGROUPS
1369 1370 1371 1372
	/* Control Group info protected by css_set_lock */
	struct css_set *cgroups;
	/* cg_list protected by css_set_lock and tsk->alloc_lock */
	struct list_head cg_list;
1373
#endif
1374
#ifdef CONFIG_FUTEX
1375
	struct robust_list_head __user *robust_list;
1376 1377 1378
#ifdef CONFIG_COMPAT
	struct compat_robust_list_head __user *compat_robust_list;
#endif
1379 1380
	struct list_head pi_state_list;
	struct futex_pi_state *pi_state_cache;
1381 1382 1383 1384
#endif
#ifdef CONFIG_NUMA
	struct mempolicy *mempolicy;
	short il_next;
1385
#endif
1386
	atomic_t fs_excl;	/* holding fs exclusive resources */
I
Ingo Molnar 已提交
1387
	struct rcu_head rcu;
1388 1389 1390 1391 1392

	/*
	 * cache last used pipe for splice
	 */
	struct pipe_inode_info *splice_pipe;
1393 1394
#ifdef	CONFIG_TASK_DELAY_ACCT
	struct task_delay_info *delays;
1395 1396 1397
#endif
#ifdef CONFIG_FAULT_INJECTION
	int make_it_fail;
1398
#endif
P
Peter Zijlstra 已提交
1399
	struct prop_local_single dirties;
A
Arjan van de Ven 已提交
1400 1401 1402 1403
#ifdef CONFIG_LATENCYTOP
	int latency_record_count;
	struct latency_record latency_record[LT_SAVECOUNT];
#endif
1404 1405 1406 1407 1408 1409
	/*
	 * time slack values; these are used to round up poll() and
	 * select() etc timeout values. These are in nanoseconds.
	 */
	unsigned long timer_slack_ns;
	unsigned long default_timer_slack_ns;
1410 1411

	struct list_head	*scm_work_list;
1412
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1413 1414 1415 1416 1417 1418 1419 1420 1421
	/* Index of current stored adress in ret_stack */
	int curr_ret_stack;
	/* Stack of return addresses for return function tracing */
	struct ftrace_ret_stack	*ret_stack;
	/*
	 * Number of functions that haven't been traced
	 * because of depth overrun.
	 */
	atomic_t trace_overrun;
1422 1423
	/* Pause for the tracing */
	atomic_t tracing_graph_pause;
1424
#endif
1425 1426 1427 1428
#ifdef CONFIG_TRACING
	/* state flags for use by tracers */
	unsigned long trace;
#endif
L
Linus Torvalds 已提交
1429 1430
};

1431 1432 1433
/* Future-safe accessor for struct task_struct's cpus_allowed. */
#define tsk_cpumask(tsk) (&(tsk)->cpus_allowed)

1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
/*
 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
 * values are inverted: lower p->prio value means higher priority.
 *
 * The MAX_USER_RT_PRIO value allows the actual maximum
 * RT priority to be separate from the value exported to
 * user-space.  This allows kernel threads to set their
 * priority to a value higher than any user task. Note:
 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
 */

#define MAX_USER_RT_PRIO	100
#define MAX_RT_PRIO		MAX_USER_RT_PRIO

#define MAX_PRIO		(MAX_RT_PRIO + 40)
#define DEFAULT_PRIO		(MAX_RT_PRIO + 20)

static inline int rt_prio(int prio)
{
	if (unlikely(prio < MAX_RT_PRIO))
		return 1;
	return 0;
}

A
Alexey Dobriyan 已提交
1460
static inline int rt_task(struct task_struct *p)
1461 1462 1463 1464
{
	return rt_prio(p->prio);
}

P
Pavel Emelianov 已提交
1465
static inline void set_task_session(struct task_struct *tsk, pid_t session)
1466
{
P
Pavel Emelianov 已提交
1467
	tsk->signal->__session = session;
1468 1469
}

1470 1471 1472 1473 1474
static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
{
	tsk->signal->__pgrp = pgrp;
}

A
Alexey Dobriyan 已提交
1475
static inline struct pid *task_pid(struct task_struct *task)
1476 1477 1478 1479
{
	return task->pids[PIDTYPE_PID].pid;
}

A
Alexey Dobriyan 已提交
1480
static inline struct pid *task_tgid(struct task_struct *task)
1481 1482 1483 1484
{
	return task->group_leader->pids[PIDTYPE_PID].pid;
}

A
Alexey Dobriyan 已提交
1485
static inline struct pid *task_pgrp(struct task_struct *task)
1486 1487 1488 1489
{
	return task->group_leader->pids[PIDTYPE_PGID].pid;
}

A
Alexey Dobriyan 已提交
1490
static inline struct pid *task_session(struct task_struct *task)
1491 1492 1493 1494
{
	return task->group_leader->pids[PIDTYPE_SID].pid;
}

1495 1496 1497 1498 1499 1500 1501
struct pid_namespace;

/*
 * the helpers to get the task's different pids as they are seen
 * from various namespaces
 *
 * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
E
Eric W. Biederman 已提交
1502 1503
 * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
 *                     current.
1504 1505 1506 1507 1508 1509 1510
 * task_xid_nr_ns()  : id seen from the ns specified;
 *
 * set_task_vxid()   : assigns a virtual id to a task;
 *
 * see also pid_nr() etc in include/linux/pid.h
 */

A
Alexey Dobriyan 已提交
1511
static inline pid_t task_pid_nr(struct task_struct *tsk)
1512 1513 1514 1515
{
	return tsk->pid;
}

1516
pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1517 1518 1519 1520 1521 1522 1523

static inline pid_t task_pid_vnr(struct task_struct *tsk)
{
	return pid_vnr(task_pid(tsk));
}


A
Alexey Dobriyan 已提交
1524
static inline pid_t task_tgid_nr(struct task_struct *tsk)
1525 1526 1527 1528
{
	return tsk->tgid;
}

1529
pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1530 1531 1532 1533 1534 1535 1536

static inline pid_t task_tgid_vnr(struct task_struct *tsk)
{
	return pid_vnr(task_tgid(tsk));
}


A
Alexey Dobriyan 已提交
1537
static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1538
{
1539
	return tsk->signal->__pgrp;
1540 1541
}

1542
pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1543 1544 1545 1546 1547 1548 1549

static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
{
	return pid_vnr(task_pgrp(tsk));
}


A
Alexey Dobriyan 已提交
1550
static inline pid_t task_session_nr(struct task_struct *tsk)
1551 1552 1553 1554
{
	return tsk->signal->__session;
}

1555
pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1556 1557 1558 1559 1560 1561 1562

static inline pid_t task_session_vnr(struct task_struct *tsk)
{
	return pid_vnr(task_session(tsk));
}


L
Linus Torvalds 已提交
1563 1564 1565 1566 1567 1568 1569 1570
/**
 * pid_alive - check that a task structure is not stale
 * @p: Task structure to be checked.
 *
 * Test if a process is not yet dead (at most zombie state)
 * If pid_alive fails, then pointers within the task structure
 * can be stale and must not be dereferenced.
 */
A
Alexey Dobriyan 已提交
1571
static inline int pid_alive(struct task_struct *p)
L
Linus Torvalds 已提交
1572
{
1573
	return p->pids[PIDTYPE_PID].pid != NULL;
L
Linus Torvalds 已提交
1574 1575
}

1576
/**
1577
 * is_global_init - check if a task structure is init
1578 1579 1580
 * @tsk: Task structure to be checked.
 *
 * Check if a task structure is the first user space task the kernel created.
1581
 */
A
Alexey Dobriyan 已提交
1582
static inline int is_global_init(struct task_struct *tsk)
1583 1584 1585
{
	return tsk->pid == 1;
}
1586 1587 1588 1589

/*
 * is_container_init:
 * check whether in the task is init in its own pid namespace.
1590
 */
1591
extern int is_container_init(struct task_struct *tsk);
1592

1593 1594
extern struct pid *cad_pid;

L
Linus Torvalds 已提交
1595 1596
extern void free_task(struct task_struct *tsk);
#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
I
Ingo Molnar 已提交
1597

1598
extern void __put_task_struct(struct task_struct *t);
I
Ingo Molnar 已提交
1599 1600 1601 1602

static inline void put_task_struct(struct task_struct *t)
{
	if (atomic_dec_and_test(&t->usage))
1603
		__put_task_struct(t);
I
Ingo Molnar 已提交
1604
}
L
Linus Torvalds 已提交
1605

1606 1607 1608 1609
extern cputime_t task_utime(struct task_struct *p);
extern cputime_t task_stime(struct task_struct *p);
extern cputime_t task_gtime(struct task_struct *p);

L
Linus Torvalds 已提交
1610 1611 1612 1613 1614 1615 1616
/*
 * Per process flags
 */
#define PF_ALIGNWARN	0x00000001	/* Print alignment warning msgs */
					/* Not implemented yet, only for 486*/
#define PF_STARTING	0x00000002	/* being created */
#define PF_EXITING	0x00000004	/* getting shut down */
1617
#define PF_EXITPIDONE	0x00000008	/* pi exit done on shut down */
1618
#define PF_VCPU		0x00000010	/* I'm a virtual CPU */
L
Linus Torvalds 已提交
1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631
#define PF_FORKNOEXEC	0x00000040	/* forked but didn't exec */
#define PF_SUPERPRIV	0x00000100	/* used super-user privileges */
#define PF_DUMPCORE	0x00000200	/* dumped core */
#define PF_SIGNALED	0x00000400	/* killed by a signal */
#define PF_MEMALLOC	0x00000800	/* Allocating memory */
#define PF_FLUSHER	0x00001000	/* responsible for disk writeback */
#define PF_USED_MATH	0x00002000	/* if unset the fpu must be initialized before use */
#define PF_NOFREEZE	0x00008000	/* this thread should not be frozen */
#define PF_FROZEN	0x00010000	/* frozen for system suspend */
#define PF_FSTRANS	0x00020000	/* inside a filesystem transaction */
#define PF_KSWAPD	0x00040000	/* I am kswapd */
#define PF_SWAPOFF	0x00080000	/* I am in swapoff */
#define PF_LESS_THROTTLE 0x00100000	/* Throttle me less: I clean memory */
1632
#define PF_KTHREAD	0x00200000	/* I am a kernel thread */
J
Jens Axboe 已提交
1633 1634 1635 1636
#define PF_RANDOMIZE	0x00400000	/* randomize virtual address space */
#define PF_SWAPWRITE	0x00800000	/* Allowed to write to swap */
#define PF_SPREAD_PAGE	0x01000000	/* Spread page cache over cpuset */
#define PF_SPREAD_SLAB	0x02000000	/* Spread some slab caches over cpuset */
1637
#define PF_THREAD_BOUND	0x04000000	/* Thread bound to specific cpu */
1638
#define PF_MEMPOLICY	0x10000000	/* Non-default NUMA mempolicy */
1639
#define PF_MUTEX_TESTER	0x20000000	/* Thread belongs to the rt mutex tester */
R
Rafael J. Wysocki 已提交
1640
#define PF_FREEZER_SKIP	0x40000000	/* Freezer should not count it as freezeable */
1641
#define PF_FREEZER_NOSIG 0x80000000	/* Freezer won't send signals to it */
L
Linus Torvalds 已提交
1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668

/*
 * Only the _current_ task can read/write to tsk->flags, but other
 * tasks can access tsk->flags in readonly mode for example
 * with tsk_used_math (like during threaded core dumping).
 * There is however an exception to this rule during ptrace
 * or during fork: the ptracer task is allowed to write to the
 * child->flags of its traced child (same goes for fork, the parent
 * can write to the child->flags), because we're guaranteed the
 * child is not running and in turn not changing child->flags
 * at the same time the parent does it.
 */
#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
#define clear_used_math() clear_stopped_child_used_math(current)
#define set_used_math() set_stopped_child_used_math(current)
#define conditional_stopped_child_used_math(condition, child) \
	do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
#define conditional_used_math(condition) \
	conditional_stopped_child_used_math(condition, current)
#define copy_to_stopped_child_used_math(child) \
	do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
#define used_math() tsk_used_math(current)

#ifdef CONFIG_SMP
1669
extern int set_cpus_allowed_ptr(struct task_struct *p,
1670
				const struct cpumask *new_mask);
L
Linus Torvalds 已提交
1671
#else
1672
static inline int set_cpus_allowed_ptr(struct task_struct *p,
1673
				       const struct cpumask *new_mask)
L
Linus Torvalds 已提交
1674
{
1675
	if (!cpumask_test_cpu(0, new_mask))
L
Linus Torvalds 已提交
1676 1677 1678 1679
		return -EINVAL;
	return 0;
}
#endif
1680 1681 1682 1683
static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
{
	return set_cpus_allowed_ptr(p, &new_mask);
}
L
Linus Torvalds 已提交
1684

1685 1686 1687 1688 1689 1690 1691 1692 1693 1694
/*
 * Architectures can set this to 1 if they have specified
 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
 * but then during bootup it turns out that sched_clock()
 * is reliable after all:
 */
#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
extern int sched_clock_stable;
#endif

L
Linus Torvalds 已提交
1695
extern unsigned long long sched_clock(void);
1696

1697 1698
extern void sched_clock_init(void);
extern u64 sched_clock_cpu(int cpu);
1699

1700
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711
static inline void sched_clock_tick(void)
{
}

static inline void sched_clock_idle_sleep_event(void)
{
}

static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
{
}
1712
#else
1713 1714 1715 1716 1717
extern void sched_clock_tick(void);
extern void sched_clock_idle_sleep_event(void);
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
#endif

1718 1719 1720 1721 1722 1723
/*
 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
 * clock constructed from sched_clock():
 */
extern unsigned long long cpu_clock(int cpu);

1724
extern unsigned long long
1725
task_sched_runtime(struct task_struct *task);
1726
extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
L
Linus Torvalds 已提交
1727 1728 1729 1730 1731 1732 1733 1734

/* sched_exec is called by processes performing an exec */
#ifdef CONFIG_SMP
extern void sched_exec(void);
#else
#define sched_exec()   {}
#endif

1735 1736
extern void sched_clock_idle_sleep_event(void);
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1737

L
Linus Torvalds 已提交
1738 1739 1740 1741 1742 1743 1744
#ifdef CONFIG_HOTPLUG_CPU
extern void idle_task_exit(void);
#else
static inline void idle_task_exit(void) {}
#endif

extern void sched_idle_next(void);
1745

1746 1747 1748 1749 1750 1751
#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
extern void wake_up_idle_cpu(int cpu);
#else
static inline void wake_up_idle_cpu(int cpu) { }
#endif

1752
extern unsigned int sysctl_sched_latency;
1753
extern unsigned int sysctl_sched_min_granularity;
1754
extern unsigned int sysctl_sched_wakeup_granularity;
1755 1756 1757
extern unsigned int sysctl_sched_shares_ratelimit;
extern unsigned int sysctl_sched_shares_thresh;
#ifdef CONFIG_SCHED_DEBUG
1758 1759
extern unsigned int sysctl_sched_child_runs_first;
extern unsigned int sysctl_sched_features;
1760
extern unsigned int sysctl_sched_migration_cost;
1761
extern unsigned int sysctl_sched_nr_migrate;
1762 1763 1764 1765

int sched_nr_latency_handler(struct ctl_table *table, int write,
		struct file *file, void __user *buffer, size_t *length,
		loff_t *ppos);
1766
#endif
P
Peter Zijlstra 已提交
1767 1768
extern unsigned int sysctl_sched_rt_period;
extern int sysctl_sched_rt_runtime;
1769

1770 1771 1772 1773
int sched_rt_handler(struct ctl_table *table, int write,
		struct file *filp, void __user *buffer, size_t *lenp,
		loff_t *ppos);

1774
extern unsigned int sysctl_sched_compat_yield;
1775

1776
#ifdef CONFIG_RT_MUTEXES
1777 1778 1779
extern int rt_mutex_getprio(struct task_struct *p);
extern void rt_mutex_setprio(struct task_struct *p, int prio);
extern void rt_mutex_adjust_pi(struct task_struct *p);
1780
#else
A
Alexey Dobriyan 已提交
1781
static inline int rt_mutex_getprio(struct task_struct *p)
1782 1783 1784
{
	return p->normal_prio;
}
1785
# define rt_mutex_adjust_pi(p)		do { } while (0)
1786 1787
#endif

1788 1789 1790 1791 1792
extern void set_user_nice(struct task_struct *p, long nice);
extern int task_prio(const struct task_struct *p);
extern int task_nice(const struct task_struct *p);
extern int can_nice(const struct task_struct *p, const int nice);
extern int task_curr(const struct task_struct *p);
L
Linus Torvalds 已提交
1793 1794
extern int idle_cpu(int cpu);
extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1795 1796
extern int sched_setscheduler_nocheck(struct task_struct *, int,
				      struct sched_param *);
1797 1798 1799
extern struct task_struct *idle_task(int cpu);
extern struct task_struct *curr_task(int cpu);
extern void set_curr_task(int cpu, struct task_struct *p);
L
Linus Torvalds 已提交
1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827

void yield(void);

/*
 * The default (Linux) execution domain.
 */
extern struct exec_domain	default_exec_domain;

union thread_union {
	struct thread_info thread_info;
	unsigned long stack[THREAD_SIZE/sizeof(long)];
};

#ifndef __HAVE_ARCH_KSTACK_END
static inline int kstack_end(void *addr)
{
	/* Reliable end of stack detection:
	 * Some APM bios versions misalign the stack
	 */
	return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
}
#endif

extern union thread_union init_thread_union;
extern struct task_struct init_task;

extern struct   mm_struct init_mm;

1828 1829 1830 1831 1832 1833 1834 1835 1836 1837
extern struct pid_namespace init_pid_ns;

/*
 * find a task by one of its numerical ids
 *
 * find_task_by_pid_type_ns():
 *      it is the most generic call - it finds a task by all id,
 *      type and namespace specified
 * find_task_by_pid_ns():
 *      finds a task by its pid in the specified namespace
1838 1839
 * find_task_by_vpid():
 *      finds a task by its virtual pid
1840
 *
1841
 * see also find_vpid() etc in include/linux/pid.h
1842 1843 1844 1845 1846
 */

extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
		struct pid_namespace *ns);

1847 1848 1849
extern struct task_struct *find_task_by_vpid(pid_t nr);
extern struct task_struct *find_task_by_pid_ns(pid_t nr,
		struct pid_namespace *ns);
1850

1851
extern void __set_special_pids(struct pid *pid);
L
Linus Torvalds 已提交
1852 1853

/* per-UID process charging. */
1854
extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
L
Linus Torvalds 已提交
1855 1856 1857 1858 1859 1860
static inline struct user_struct *get_uid(struct user_struct *u)
{
	atomic_inc(&u->__count);
	return u;
}
extern void free_uid(struct user_struct *);
1861
extern void release_uids(struct user_namespace *ns);
L
Linus Torvalds 已提交
1862 1863 1864

#include <asm/current.h>

1865
extern void do_timer(unsigned long ticks);
L
Linus Torvalds 已提交
1866

1867 1868 1869 1870
extern int wake_up_state(struct task_struct *tsk, unsigned int state);
extern int wake_up_process(struct task_struct *tsk);
extern void wake_up_new_task(struct task_struct *tsk,
				unsigned long clone_flags);
L
Linus Torvalds 已提交
1871 1872 1873 1874 1875
#ifdef CONFIG_SMP
 extern void kick_process(struct task_struct *tsk);
#else
 static inline void kick_process(struct task_struct *tsk) { }
#endif
1876 1877
extern void sched_fork(struct task_struct *p, int clone_flags);
extern void sched_dead(struct task_struct *p);
L
Linus Torvalds 已提交
1878 1879 1880

extern void proc_caches_init(void);
extern void flush_signals(struct task_struct *);
1881
extern void ignore_signals(struct task_struct *);
L
Linus Torvalds 已提交
1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903
extern void flush_signal_handlers(struct task_struct *, int force_default);
extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);

static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
{
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&tsk->sighand->siglock, flags);
	ret = dequeue_signal(tsk, mask, info);
	spin_unlock_irqrestore(&tsk->sighand->siglock, flags);

	return ret;
}	

extern void block_all_signals(int (*notifier)(void *priv), void *priv,
			      sigset_t *mask);
extern void unblock_all_signals(void);
extern void release_task(struct task_struct * p);
extern int send_sig_info(int, struct siginfo *, struct task_struct *);
extern int force_sigsegv(int, struct task_struct *);
extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1904 1905
extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1906
extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1907 1908
extern int kill_pgrp(struct pid *pid, int sig, int priv);
extern int kill_pid(struct pid *pid, int sig, int priv);
1909
extern int kill_proc_info(int, struct siginfo *, pid_t);
R
Roland McGrath 已提交
1910
extern int do_notify_parent(struct task_struct *, int);
L
Linus Torvalds 已提交
1911 1912 1913 1914 1915 1916
extern void force_sig(int, struct task_struct *);
extern void force_sig_specific(int, struct task_struct *);
extern int send_sig(int, struct task_struct *, int);
extern void zap_other_threads(struct task_struct *p);
extern struct sigqueue *sigqueue_alloc(void);
extern void sigqueue_free(struct sigqueue *);
1917
extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
1918
extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
L
Linus Torvalds 已提交
1919 1920
extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);

1921 1922 1923 1924 1925
static inline int kill_cad_pid(int sig, int priv)
{
	return kill_pid(cad_pid, sig, priv);
}

L
Linus Torvalds 已提交
1926 1927 1928 1929 1930
/* These can be the second arg to send_sig_info/send_group_sig_info.  */
#define SEND_SIG_NOINFO ((struct siginfo *) 0)
#define SEND_SIG_PRIV	((struct siginfo *) 1)
#define SEND_SIG_FORCED	((struct siginfo *) 2)

1931 1932 1933 1934 1935
static inline int is_si_special(const struct siginfo *info)
{
	return info <= SEND_SIG_FORCED;
}

L
Linus Torvalds 已提交
1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954
/* True if we are on the alternate signal stack.  */

static inline int on_sig_stack(unsigned long sp)
{
	return (sp - current->sas_ss_sp < current->sas_ss_size);
}

static inline int sas_ss_flags(unsigned long sp)
{
	return (current->sas_ss_size == 0 ? SS_DISABLE
		: on_sig_stack(sp) ? SS_ONSTACK : 0);
}

/*
 * Routines for handling mm_structs
 */
extern struct mm_struct * mm_alloc(void);

/* mmdrop drops the mm and the page tables */
1955
extern void __mmdrop(struct mm_struct *);
L
Linus Torvalds 已提交
1956 1957
static inline void mmdrop(struct mm_struct * mm)
{
I
Ingo Molnar 已提交
1958
	if (unlikely(atomic_dec_and_test(&mm->mm_count)))
L
Linus Torvalds 已提交
1959 1960 1961 1962 1963 1964 1965 1966 1967
		__mmdrop(mm);
}

/* mmput gets rid of the mappings and all user-space */
extern void mmput(struct mm_struct *);
/* Grab a reference to a task's mm, if it is not already going away */
extern struct mm_struct *get_task_mm(struct task_struct *task);
/* Remove the current tasks stale references to the old mm_struct */
extern void mm_release(struct task_struct *, struct mm_struct *);
1968 1969
/* Allocate a new mm structure and copy contents from tsk->mm */
extern struct mm_struct *dup_mm(struct task_struct *tsk);
L
Linus Torvalds 已提交
1970 1971 1972 1973 1974 1975

extern int  copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
extern void flush_thread(void);
extern void exit_thread(void);

extern void exit_files(struct task_struct *);
1976
extern void __cleanup_signal(struct signal_struct *);
1977
extern void __cleanup_sighand(struct sighand_struct *);
1978

L
Linus Torvalds 已提交
1979
extern void exit_itimers(struct signal_struct *);
1980
extern void flush_itimer_signals(void);
L
Linus Torvalds 已提交
1981 1982 1983 1984 1985 1986 1987 1988 1989

extern NORET_TYPE void do_group_exit(int);

extern void daemonize(const char *, ...);
extern int allow_signal(int);
extern int disallow_signal(int);

extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1990
struct task_struct *fork_idle(int);
L
Linus Torvalds 已提交
1991 1992

extern void set_task_comm(struct task_struct *tsk, char *from);
1993
extern char *get_task_comm(char *to, struct task_struct *tsk);
L
Linus Torvalds 已提交
1994 1995

#ifdef CONFIG_SMP
R
Roland McGrath 已提交
1996
extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
L
Linus Torvalds 已提交
1997
#else
R
Roland McGrath 已提交
1998 1999 2000 2001 2002
static inline unsigned long wait_task_inactive(struct task_struct *p,
					       long match_state)
{
	return 1;
}
L
Linus Torvalds 已提交
2003 2004
#endif

2005
#define next_task(p)	list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
L
Linus Torvalds 已提交
2006 2007 2008 2009

#define for_each_process(p) \
	for (p = &init_task ; (p = next_task(p)) != &init_task ; )

D
David Howells 已提交
2010 2011
extern bool is_single_threaded(struct task_struct *);

L
Linus Torvalds 已提交
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
/*
 * Careful: do_each_thread/while_each_thread is a double loop so
 *          'break' will not work as expected - use goto instead.
 */
#define do_each_thread(g, t) \
	for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do

#define while_each_thread(g, t) \
	while ((t = next_thread(t)) != g)

2022 2023
/* de_thread depends on thread_group_leader not being a pid based check */
#define thread_group_leader(p)	(p == p->group_leader)
L
Linus Torvalds 已提交
2024

2025 2026 2027 2028 2029 2030
/* Do to the insanities of de_thread it is possible for a process
 * to have the pid of the thread group leader without actually being
 * the thread group leader.  For iteration through the pids in proc
 * all we care about is that we have a task with the appropriate
 * pid, we don't actually care if we have the right task.
 */
A
Alexey Dobriyan 已提交
2031
static inline int has_group_leader_pid(struct task_struct *p)
2032 2033 2034 2035
{
	return p->pid == p->tgid;
}

2036 2037 2038 2039 2040 2041
static inline
int same_thread_group(struct task_struct *p1, struct task_struct *p2)
{
	return p1->tgid == p2->tgid;
}

2042
static inline struct task_struct *next_thread(const struct task_struct *p)
O
Oleg Nesterov 已提交
2043 2044
{
	return list_entry(rcu_dereference(p->thread_group.next),
2045
			  struct task_struct, thread_group);
O
Oleg Nesterov 已提交
2046 2047
}

A
Alexey Dobriyan 已提交
2048
static inline int thread_group_empty(struct task_struct *p)
L
Linus Torvalds 已提交
2049
{
O
Oleg Nesterov 已提交
2050
	return list_empty(&p->thread_group);
L
Linus Torvalds 已提交
2051 2052 2053 2054 2055 2056
}

#define delay_group_leader(p) \
		(thread_group_leader(p) && !thread_group_empty(p))

/*
2057
 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2058
 * subscriptions and synchronises with wait4().  Also used in procfs.  Also
2059 2060
 * pins the final release of task.io_context.  Also protects ->cpuset and
 * ->cgroup.subsys[].
L
Linus Torvalds 已提交
2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075
 *
 * Nests both inside and outside of read_lock(&tasklist_lock).
 * It must not be nested with write_lock_irq(&tasklist_lock),
 * neither inside nor outside.
 */
static inline void task_lock(struct task_struct *p)
{
	spin_lock(&p->alloc_lock);
}

static inline void task_unlock(struct task_struct *p)
{
	spin_unlock(&p->alloc_lock);
}

2076 2077 2078 2079 2080 2081 2082 2083 2084
extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
							unsigned long *flags);

static inline void unlock_task_sighand(struct task_struct *tsk,
						unsigned long *flags)
{
	spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
}

A
Al Viro 已提交
2085 2086
#ifndef __HAVE_THREAD_FUNCTIONS

R
Roman Zippel 已提交
2087 2088
#define task_thread_info(task)	((struct thread_info *)(task)->stack)
#define task_stack_page(task)	((task)->stack)
A
Al Viro 已提交
2089

2090 2091 2092 2093 2094 2095 2096 2097
static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
{
	*task_thread_info(p) = *task_thread_info(org);
	task_thread_info(p)->task = p;
}

static inline unsigned long *end_of_stack(struct task_struct *p)
{
R
Roman Zippel 已提交
2098
	return (unsigned long *)(task_thread_info(p) + 1);
2099 2100
}

A
Al Viro 已提交
2101 2102
#endif

2103 2104 2105 2106 2107 2108 2109
static inline int object_is_on_stack(void *obj)
{
	void *stack = task_stack_page(current);

	return (obj >= stack) && (obj < (stack + THREAD_SIZE));
}

2110 2111
extern void thread_info_cache_init(void);

2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
#ifdef CONFIG_DEBUG_STACK_USAGE
static inline unsigned long stack_not_used(struct task_struct *p)
{
	unsigned long *n = end_of_stack(p);

	do { 	/* Skip over canary */
		n++;
	} while (!*n);

	return (unsigned long)n - (unsigned long)end_of_stack(p);
}
#endif

L
Linus Torvalds 已提交
2125 2126 2127 2128 2129
/* set thread flags in other task's structures
 * - see asm/thread_info.h for TIF_xxxx flags available
 */
static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
2130
	set_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
2131 2132 2133 2134
}

static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
2135
	clear_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
2136 2137 2138 2139
}

static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
2140
	return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
2141 2142 2143 2144
}

static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
2145
	return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
2146 2147 2148 2149
}

static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
2150
	return test_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162
}

static inline void set_tsk_need_resched(struct task_struct *tsk)
{
	set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
}

static inline void clear_tsk_need_resched(struct task_struct *tsk)
{
	clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
}

2163 2164 2165 2166 2167
static inline int test_tsk_need_resched(struct task_struct *tsk)
{
	return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
}

L
Linus Torvalds 已提交
2168 2169 2170 2171
static inline int signal_pending(struct task_struct *p)
{
	return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
}
M
Matthew Wilcox 已提交
2172

2173
extern int __fatal_signal_pending(struct task_struct *p);
M
Matthew Wilcox 已提交
2174 2175 2176 2177 2178 2179

static inline int fatal_signal_pending(struct task_struct *p)
{
	return signal_pending(p) && __fatal_signal_pending(p);
}

2180 2181 2182 2183 2184 2185 2186 2187 2188 2189
static inline int signal_pending_state(long state, struct task_struct *p)
{
	if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
		return 0;
	if (!signal_pending(p))
		return 0;

	return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
}

L
Linus Torvalds 已提交
2190 2191
static inline int need_resched(void)
{
2192
	return unlikely(test_thread_flag(TIF_NEED_RESCHED));
L
Linus Torvalds 已提交
2193 2194 2195 2196 2197 2198 2199 2200 2201
}

/*
 * cond_resched() and cond_resched_lock(): latency reduction via
 * explicit rescheduling in places that are safe. The return
 * value indicates whether a reschedule was done in fact.
 * cond_resched_lock() will drop the spinlock before scheduling,
 * cond_resched_softirq() will enable bhs before scheduling.
 */
2202
extern int _cond_resched(void);
2203
#ifdef CONFIG_PREEMPT_BKL
2204 2205 2206 2207 2208 2209 2210 2211 2212 2213
static inline int cond_resched(void)
{
	return 0;
}
#else
static inline int cond_resched(void)
{
	return _cond_resched();
}
#endif
L
Linus Torvalds 已提交
2214 2215
extern int cond_resched_lock(spinlock_t * lock);
extern int cond_resched_softirq(void);
2216 2217 2218 2219
static inline int cond_resched_bkl(void)
{
	return _cond_resched();
}
L
Linus Torvalds 已提交
2220 2221 2222

/*
 * Does a critical section need to be broken due to another
N
Nick Piggin 已提交
2223 2224
 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
 * but a general need for low latency)
L
Linus Torvalds 已提交
2225
 */
N
Nick Piggin 已提交
2226
static inline int spin_needbreak(spinlock_t *lock)
L
Linus Torvalds 已提交
2227
{
N
Nick Piggin 已提交
2228 2229 2230
#ifdef CONFIG_PREEMPT
	return spin_is_contended(lock);
#else
L
Linus Torvalds 已提交
2231
	return 0;
N
Nick Piggin 已提交
2232
#endif
L
Linus Torvalds 已提交
2233 2234
}

2235 2236 2237
/*
 * Thread group CPU time accounting.
 */
2238
void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2239
void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2240

2241
static inline void thread_group_cputime_init(struct signal_struct *sig)
2242
{
2243 2244 2245
	sig->cputimer.cputime = INIT_CPUTIME;
	spin_lock_init(&sig->cputimer.lock);
	sig->cputimer.running = 0;
2246 2247 2248 2249 2250 2251
}

static inline void thread_group_cputime_free(struct signal_struct *sig)
{
}

R
Roland McGrath 已提交
2252 2253 2254 2255 2256 2257 2258
/*
 * Reevaluate whether the task has signals pending delivery.
 * Wake the task if so.
 * This is required every time the blocked sigset_t changes.
 * callers must hold sighand->siglock.
 */
extern void recalc_sigpending_and_wake(struct task_struct *t);
L
Linus Torvalds 已提交
2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269
extern void recalc_sigpending(void);

extern void signal_wake_up(struct task_struct *t, int resume_stopped);

/*
 * Wrappers for p->thread_info->cpu access. No-op on UP.
 */
#ifdef CONFIG_SMP

static inline unsigned int task_cpu(const struct task_struct *p)
{
A
Al Viro 已提交
2270
	return task_thread_info(p)->cpu;
L
Linus Torvalds 已提交
2271 2272
}

I
Ingo Molnar 已提交
2273
extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
L
Linus Torvalds 已提交
2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289

#else

static inline unsigned int task_cpu(const struct task_struct *p)
{
	return 0;
}

static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
{
}

#endif /* CONFIG_SMP */

extern void arch_pick_mmap_layout(struct mm_struct *mm);

I
Ingo Molnar 已提交
2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301
#ifdef CONFIG_TRACING
extern void
__trace_special(void *__tr, void *__data,
		unsigned long arg1, unsigned long arg2, unsigned long arg3);
#else
static inline void
__trace_special(void *__tr, void *__data,
		unsigned long arg1, unsigned long arg2, unsigned long arg3)
{
}
#endif

2302 2303
extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2304

L
Linus Torvalds 已提交
2305 2306
extern void normalize_rt_tasks(void);

2307
#ifdef CONFIG_GROUP_SCHED
2308

2309
extern struct task_group init_task_group;
2310 2311
#ifdef CONFIG_USER_SCHED
extern struct task_group root_task_group;
2312
extern void set_tg_uid(struct user_struct *user);
2313
#endif
2314

2315
extern struct task_group *sched_create_group(struct task_group *parent);
2316
extern void sched_destroy_group(struct task_group *tg);
2317
extern void sched_move_task(struct task_struct *tsk);
2318
#ifdef CONFIG_FAIR_GROUP_SCHED
2319
extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2320
extern unsigned long sched_group_shares(struct task_group *tg);
2321 2322
#endif
#ifdef CONFIG_RT_GROUP_SCHED
P
Peter Zijlstra 已提交
2323 2324 2325
extern int sched_group_set_rt_runtime(struct task_group *tg,
				      long rt_runtime_us);
extern long sched_group_rt_runtime(struct task_group *tg);
2326 2327 2328
extern int sched_group_set_rt_period(struct task_group *tg,
				      long rt_period_us);
extern long sched_group_rt_period(struct task_group *tg);
2329
extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2330
#endif
2331 2332
#endif

2333 2334 2335
extern int task_can_switch_user(struct user_struct *up,
					struct task_struct *tsk);

2336 2337 2338
#ifdef CONFIG_TASK_XACCT
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
{
2339
	tsk->ioac.rchar += amt;
2340 2341 2342 2343
}

static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
{
2344
	tsk->ioac.wchar += amt;
2345 2346 2347 2348
}

static inline void inc_syscr(struct task_struct *tsk)
{
2349
	tsk->ioac.syscr++;
2350 2351 2352 2353
}

static inline void inc_syscw(struct task_struct *tsk)
{
2354
	tsk->ioac.syscw++;
2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373
}
#else
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
{
}

static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
{
}

static inline void inc_syscr(struct task_struct *tsk)
{
}

static inline void inc_syscw(struct task_struct *tsk)
{
}
#endif

D
Dave Hansen 已提交
2374 2375 2376 2377
#ifndef TASK_SIZE_OF
#define TASK_SIZE_OF(tsk)	TASK_SIZE
#endif

2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390
#ifdef CONFIG_MM_OWNER
extern void mm_update_next_owner(struct mm_struct *mm);
extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
#else
static inline void mm_update_next_owner(struct mm_struct *mm)
{
}

static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
{
}
#endif /* CONFIG_MM_OWNER */

2391 2392
#define TASK_STATE_TO_CHAR_STR "RSDTtZX"

L
Linus Torvalds 已提交
2393 2394 2395
#endif /* __KERNEL__ */

#endif