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[linux-2.6-block.git] / include / linux / sched.h
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1da177e4
LT		 1#ifndef _LINUX_SCHED_H
2#define _LINUX_SCHED_H
3
b7b3c76a
DW		 4/*
5 * cloning flags:
6 */
7#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
8#define CLONE_VM 0x00000100 /* set if VM shared between processes */
9#define CLONE_FS 0x00000200 /* set if fs info shared between processes */
10#define CLONE_FILES 0x00000400 /* set if open files shared between processes */
11#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
12#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
13#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
14#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
15#define CLONE_THREAD 0x00010000 /* Same thread group? */
16#define CLONE_NEWNS 0x00020000 /* New namespace group? */
17#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
18#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
19#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
20#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
21#define CLONE_DETACHED 0x00400000 /* Unused, ignored */
22#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
23#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
24#define CLONE_STOPPED 0x02000000 /* Start in stopped state */
071df104 25#define CLONE_NEWUTS 0x04000000 /* New utsname group? */
25b21cb2 26#define CLONE_NEWIPC 0x08000000 /* New ipcs */
77ec739d 27#define CLONE_NEWUSER 0x10000000 /* New user namespace */
30e49c26 28#define CLONE_NEWPID 0x20000000 /* New pid namespace */
169e3674 29#define CLONE_NEWNET 0x40000000 /* New network namespace */
fadad878 30#define CLONE_IO 0x80000000 /* Clone io context */
b7b3c76a
DW		 31
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
0e6aca43
IM		 39/* SCHED_ISO: reserved but not implemented yet */
40#define SCHED_IDLE 5
b7b3c76a 41
a3b6714e 42#ifdef __KERNEL__
b7b3c76a
DW		 43
44struct sched_param {
45 int sched_priority;
46};
47
1da177e4
LT		 48#include <asm/param.h> /* for HZ */
49
1da177e4
LT		 50#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>
c92ff1bd 61#include <linux/mm_types.h>
1da177e4
LT		 62
63#include <asm/system.h>
1da177e4
LT		 64#include <asm/page.h>
65#include <asm/ptrace.h>
1da177e4
LT		 66#include <asm/cputime.h>
67
68#include <linux/smp.h>
69#include <linux/sem.h>
70#include <linux/signal.h>
1da177e4
LT		 71#include <linux/fs_struct.h>
72#include <linux/compiler.h>
73#include <linux/completion.h>
74#include <linux/pid.h>
75#include <linux/percpu.h>
76#include <linux/topology.h>
3e26c149 77#include <linux/proportions.h>
1da177e4 78#include <linux/seccomp.h>
e56d0903 79#include <linux/rcupdate.h>
23f78d4a 80#include <linux/rtmutex.h>
1da177e4 81
a3b6714e
DW		 82#include <linux/time.h>
83#include <linux/param.h>
84#include <linux/resource.h>
85#include <linux/timer.h>
86#include <linux/hrtimer.h>
7c3ab738 87#include <linux/task_io_accounting.h>
5cb350ba 88#include <linux/kobject.h>
9745512c 89#include <linux/latencytop.h>
9e2b2dc4 90#include <linux/cred.h>
a3b6714e
DW		 91
92#include <asm/processor.h>
36d57ac4 93
78fb7466 94struct mem_cgroup;
1da177e4 95struct exec_domain;
c87e2837 96struct futex_pi_state;
286100a6 97struct robust_list_head;
d89d8796 98struct bio;
1da177e4 99
1da177e4
LT		 100/*
101 * List of flags we want to share for kernel threads,
102 * if only because they are not used by them anyway.
103 */
104#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
105
106/*
107 * These are the constant used to fake the fixed-point load-average
108 * counting. Some notes:
109 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
110 * a load-average precision of 10 bits integer + 11 bits fractional
111 * - if you want to count load-averages more often, you need more
112 * precision, or rounding will get you. With 2-second counting freq,
113 * the EXP_n values would be 1981, 2034 and 2043 if still using only
114 * 11 bit fractions.
115 */
116extern unsigned long avenrun[]; /* Load averages */
117
118#define FSHIFT 11 /* nr of bits of precision */
119#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
0c2043ab 120#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
1da177e4
LT		 121#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
122#define EXP_5 2014 /* 1/exp(5sec/5min) */
123#define EXP_15 2037 /* 1/exp(5sec/15min) */
124
125#define CALC_LOAD(load,exp,n) \
126 load *= exp; \
127 load += n*(FIXED_1-exp); \
128 load >>= FSHIFT;
129
130extern unsigned long total_forks;
131extern int nr_threads;
1da177e4
LT		 132DECLARE_PER_CPU(unsigned long, process_counts);
133extern int nr_processes(void);
134extern unsigned long nr_running(void);
135extern unsigned long nr_uninterruptible(void);
db1b1fef 136extern unsigned long nr_active(void);
1da177e4
LT		 137extern unsigned long nr_iowait(void);
138
43ae34cb
IM		 139struct seq_file;
140struct cfs_rq;
4cf86d77 141struct task_group;
43ae34cb
IM		 142#ifdef CONFIG_SCHED_DEBUG
143extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
144extern void proc_sched_set_task(struct task_struct *p);
145extern void
5cef9eca 146print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
43ae34cb
IM		 147#else
148static inline void
149proc_sched_show_task(struct task_struct *p, struct seq_file *m)
150{
151}
152static inline void proc_sched_set_task(struct task_struct *p)
153{
154}
155static inline void
5cef9eca 156print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
43ae34cb
IM		 157{
158}
159#endif
1da177e4 160
690229a0
IM		 161extern unsigned long long time_sync_thresh;
162
4a8342d2
LT		 163/*
164 * Task state bitmask. NOTE! These bits are also
165 * encoded in fs/proc/array.c: get_task_state().
166 *
167 * We have two separate sets of flags: task->state
168 * is about runnability, while task->exit_state are
169 * about the task exiting. Confusing, but this way
170 * modifying one set can't modify the other one by
171 * mistake.
172 */
1da177e4
LT		 173#define TASK_RUNNING 0
174#define TASK_INTERRUPTIBLE 1
175#define TASK_UNINTERRUPTIBLE 2
f021a3c2
MW		 176#define __TASK_STOPPED 4
177#define __TASK_TRACED 8
4a8342d2
LT		 178/* in tsk->exit_state */
179#define EXIT_ZOMBIE 16
180#define EXIT_DEAD 32
181/* in tsk->state again */
af927232 182#define TASK_DEAD 64
f021a3c2
MW		 183#define TASK_WAKEKILL 128
184
185/* Convenience macros for the sake of set_task_state */
186#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
187#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
188#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
1da177e4 189
92a1f4bc
MW		 190/* Convenience macros for the sake of wake_up */
191#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
f021a3c2 192#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
92a1f4bc
MW		 193
194/* get_task_state() */
195#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
f021a3c2
MW		 196 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
197 __TASK_TRACED)
92a1f4bc 198
f021a3c2
MW		 199#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
200#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
92a1f4bc 201#define task_is_stopped_or_traced(task) \
f021a3c2 202 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
92a1f4bc
MW		 203#define task_contributes_to_load(task) \
204 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
1da177e4
LT		 205
206#define __set_task_state(tsk, state_value) \
207 do { (tsk)->state = (state_value); } while (0)
208#define set_task_state(tsk, state_value) \
209 set_mb((tsk)->state, (state_value))
210
498d0c57
AM		 211/*
212 * set_current_state() includes a barrier so that the write of current->state
213 * is correctly serialised wrt the caller's subsequent test of whether to
214 * actually sleep:
215 *
216 * set_current_state(TASK_UNINTERRUPTIBLE);
217 * if (do_i_need_to_sleep())
218 * schedule();
219 *
220 * If the caller does not need such serialisation then use __set_current_state()
221 */
1da177e4
LT		 222#define __set_current_state(state_value) \
223 do { current->state = (state_value); } while (0)
224#define set_current_state(state_value) \
225 set_mb(current->state, (state_value))
226
227/* Task command name length */
228#define TASK_COMM_LEN 16
229
1da177e4
LT		 230#include <linux/spinlock.h>
231
232/*
233 * This serializes "schedule()" and also protects
234 * the run-queue from deletions/modifications (but
235 * _adding_ to the beginning of the run-queue has
236 * a separate lock).
237 */
238extern rwlock_t tasklist_lock;
239extern spinlock_t mmlist_lock;
240
36c8b586 241struct task_struct;
1da177e4
LT		 242
243extern void sched_init(void);
244extern void sched_init_smp(void);
2d07b255 245extern asmlinkage void schedule_tail(struct task_struct *prev);
36c8b586 246extern void init_idle(struct task_struct *idle, int cpu);
1df21055 247extern void init_idle_bootup_task(struct task_struct *idle);
1da177e4 248
017730c1
IM		 249extern int runqueue_is_locked(void);
250
1da177e4 251extern cpumask_t nohz_cpu_mask;
46cb4b7c
SS		 252#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
253extern int select_nohz_load_balancer(int cpu);
254#else
255static inline int select_nohz_load_balancer(int cpu)
256{
257 return 0;
258}
259#endif
1da177e4 260
48d5e258
PZ		 261extern unsigned long rt_needs_cpu(int cpu);
262
e59e2ae2 263/*
39bc89fd 264 * Only dump TASK_* tasks. (0 for all tasks)
e59e2ae2
IM		 265 */
266extern void show_state_filter(unsigned long state_filter);
267
268static inline void show_state(void)
269{
39bc89fd 270 show_state_filter(0);
e59e2ae2
IM		 271}
272
1da177e4
LT		 273extern void show_regs(struct pt_regs *);
274
275/*
276 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
277 * task), SP is the stack pointer of the first frame that should be shown in the back
278 * trace (or NULL if the entire call-chain of the task should be shown).
279 */
280extern void show_stack(struct task_struct *task, unsigned long *sp);
281
282void io_schedule(void);
283long io_schedule_timeout(long timeout);
284
285extern void cpu_init (void);
286extern void trap_init(void);
fa13a5a1 287extern void account_process_tick(struct task_struct *task, int user);
1da177e4
LT		 288extern void update_process_times(int user);
289extern void scheduler_tick(void);
290
82a1fcb9
IM		 291extern void sched_show_task(struct task_struct *p);
292
8446f1d3 293#ifdef CONFIG_DETECT_SOFTLOCKUP
6687a97d 294extern void softlockup_tick(void);
8446f1d3 295extern void touch_softlockup_watchdog(void);
04c9167f 296extern void touch_all_softlockup_watchdogs(void);
9c44bc03 297extern unsigned int softlockup_panic;
82a1fcb9
IM		 298extern unsigned long sysctl_hung_task_check_count;
299extern unsigned long sysctl_hung_task_timeout_secs;
90739081 300extern unsigned long sysctl_hung_task_warnings;
9383d967 301extern int softlockup_thresh;
8446f1d3 302#else
6687a97d 303static inline void softlockup_tick(void)
8446f1d3
IM		 304{
305}
306static inline void spawn_softlockup_task(void)
307{
308}
309static inline void touch_softlockup_watchdog(void)
310{
311}
04c9167f
JF		 312static inline void touch_all_softlockup_watchdogs(void)
313{
314}
8446f1d3
IM		 315#endif
316
317
1da177e4
LT		 318/* Attach to any functions which should be ignored in wchan output. */
319#define __sched __attribute__((__section__(".sched.text")))
deaf2227
IM		 320
321/* Linker adds these: start and end of __sched functions */
322extern char __sched_text_start[], __sched_text_end[];
323
1da177e4
LT		 324/* Is this address in the __sched functions? */
325extern int in_sched_functions(unsigned long addr);
326
327#define MAX_SCHEDULE_TIMEOUT LONG_MAX
b3c97528 328extern signed long schedule_timeout(signed long timeout);
64ed93a2 329extern signed long schedule_timeout_interruptible(signed long timeout);
294d5cc2 330extern signed long schedule_timeout_killable(signed long timeout);
64ed93a2 331extern signed long schedule_timeout_uninterruptible(signed long timeout);
1da177e4
LT		 332asmlinkage void schedule(void);
333
ab516013 334struct nsproxy;
acce292c 335struct user_namespace;
1da177e4
LT		 336
337/* Maximum number of active map areas.. This is a random (large) number */
338#define DEFAULT_MAX_MAP_COUNT 65536
339
340extern int sysctl_max_map_count;
341
342#include <linux/aio.h>
343
344extern unsigned long
345arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
346 unsigned long, unsigned long);
347extern unsigned long
348arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
349 unsigned long len, unsigned long pgoff,
350 unsigned long flags);
1363c3cd
WW		 351extern void arch_unmap_area(struct mm_struct *, unsigned long);
352extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
1da177e4 353
f7d0b926 354#if USE_SPLIT_PTLOCKS
f412ac08
HD		 355/*
356 * The mm counters are not protected by its page_table_lock,
357 * so must be incremented atomically.
358 */
d3cb4871
CL		 359#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
360#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
361#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
362#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
363#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
f412ac08 364
f7d0b926 365#else /* !USE_SPLIT_PTLOCKS */
f412ac08
HD		 366/*
367 * The mm counters are protected by its page_table_lock,
368 * so can be incremented directly.
369 */
1da177e4
LT		 370#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
371#define get_mm_counter(mm, member) ((mm)->_##member)
372#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
373#define inc_mm_counter(mm, member) (mm)->_##member++
374#define dec_mm_counter(mm, member) (mm)->_##member--
f412ac08 375
f7d0b926 376#endif /* !USE_SPLIT_PTLOCKS */
4294621f 377
f412ac08
HD		 378#define get_mm_rss(mm) \
379 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
365e9c87
HD		 380#define update_hiwater_rss(mm) do { \
381 unsigned long _rss = get_mm_rss(mm); \
382 if ((mm)->hiwater_rss < _rss) \
383 (mm)->hiwater_rss = _rss; \
384} while (0)
385#define update_hiwater_vm(mm) do { \
386 if ((mm)->hiwater_vm < (mm)->total_vm) \
387 (mm)->hiwater_vm = (mm)->total_vm; \
388} while (0)
389
6c5d5238
KH		 390extern void set_dumpable(struct mm_struct *mm, int value);
391extern int get_dumpable(struct mm_struct *mm);
392
393/* mm flags */
3cb4a0bb 394/* dumpable bits */
6c5d5238
KH		 395#define MMF_DUMPABLE 0 /* core dump is permitted */
396#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
3cb4a0bb
KH		 397#define MMF_DUMPABLE_BITS 2
398
399/* coredump filter bits */
400#define MMF_DUMP_ANON_PRIVATE 2
401#define MMF_DUMP_ANON_SHARED 3
402#define MMF_DUMP_MAPPED_PRIVATE 4
403#define MMF_DUMP_MAPPED_SHARED 5
82df3973 404#define MMF_DUMP_ELF_HEADERS 6
e575f111
KM		 405#define MMF_DUMP_HUGETLB_PRIVATE 7
406#define MMF_DUMP_HUGETLB_SHARED 8
3cb4a0bb 407#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
e575f111 408#define MMF_DUMP_FILTER_BITS 7
3cb4a0bb
KH		 409#define MMF_DUMP_FILTER_MASK \
410 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
411#define MMF_DUMP_FILTER_DEFAULT \
e575f111 412 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
656eb2cd
RM		 413 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
414
415#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
416# define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
417#else
418# define MMF_DUMP_MASK_DEFAULT_ELF 0
419#endif
6c5d5238 420
1da177e4
LT		 421struct sighand_struct {
422 atomic_t count;
423 struct k_sigaction action[_NSIG];
424 spinlock_t siglock;
b8fceee1 425 wait_queue_head_t signalfd_wqh;
1da177e4
LT		 426};
427
0e464814 428struct pacct_struct {
f6ec29a4
KK		 429 int ac_flag;
430 long ac_exitcode;
0e464814 431 unsigned long ac_mem;
77787bfb
KK		 432 cputime_t ac_utime, ac_stime;
433 unsigned long ac_minflt, ac_majflt;
0e464814
KK		 434};
435
f06febc9
FM		 436/**
437 * struct task_cputime - collected CPU time counts
438 * @utime: time spent in user mode, in &cputime_t units
439 * @stime: time spent in kernel mode, in &cputime_t units
440 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
5ce73a4a 441 *
f06febc9
FM		 442 * This structure groups together three kinds of CPU time that are
443 * tracked for threads and thread groups. Most things considering
444 * CPU time want to group these counts together and treat all three
445 * of them in parallel.
446 */
447struct task_cputime {
448 cputime_t utime;
449 cputime_t stime;
450 unsigned long long sum_exec_runtime;
451};
452/* Alternate field names when used to cache expirations. */
453#define prof_exp stime
454#define virt_exp utime
455#define sched_exp sum_exec_runtime
456
457/**
458 * struct thread_group_cputime - thread group interval timer counts
459 * @totals: thread group interval timers; substructure for
460 * uniprocessor kernel, per-cpu for SMP kernel.
461 *
462 * This structure contains the version of task_cputime, above, that is
463 * used for thread group CPU clock calculations.
464 */
f06febc9
FM		 465struct thread_group_cputime {
466 struct task_cputime *totals;
467};
f06febc9 468
1da177e4
LT		 469/*
470 * NOTE! "signal_struct" does not have it's own
471 * locking, because a shared signal_struct always
472 * implies a shared sighand_struct, so locking
473 * sighand_struct is always a proper superset of
474 * the locking of signal_struct.
475 */
476struct signal_struct {
477 atomic_t count;
478 atomic_t live;
479
480 wait_queue_head_t wait_chldexit; /* for wait4() */
481
482 /* current thread group signal load-balancing target: */
36c8b586 483 struct task_struct *curr_target;
1da177e4
LT		 484
485 /* shared signal handling: */
486 struct sigpending shared_pending;
487
488 /* thread group exit support */
489 int group_exit_code;
490 /* overloaded:
491 * - notify group_exit_task when ->count is equal to notify_count
492 * - everyone except group_exit_task is stopped during signal delivery
493 * of fatal signals, group_exit_task processes the signal.
494 */
1da177e4 495 int notify_count;
07dd20e0 496 struct task_struct *group_exit_task;
1da177e4
LT		 497
498 /* thread group stop support, overloads group_exit_code too */
499 int group_stop_count;
500 unsigned int flags; /* see SIGNAL_* flags below */
501
502 /* POSIX.1b Interval Timers */
503 struct list_head posix_timers;
504
505 /* ITIMER_REAL timer for the process */
2ff678b8 506 struct hrtimer real_timer;
fea9d175 507 struct pid *leader_pid;
2ff678b8 508 ktime_t it_real_incr;
1da177e4
LT		 509
510 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
511 cputime_t it_prof_expires, it_virt_expires;
512 cputime_t it_prof_incr, it_virt_incr;
513
f06febc9
FM		 514 /*
515 * Thread group totals for process CPU clocks.
516 * See thread_group_cputime(), et al, for details.
517 */
518 struct thread_group_cputime cputime;
519
520 /* Earliest-expiration cache. */
521 struct task_cputime cputime_expires;
522
523 struct list_head cpu_timers[3];
524
1da177e4 525 /* job control IDs */
9a2e7057
PE		 526
527 /*
528 * pgrp and session fields are deprecated.
529 * use the task_session_Xnr and task_pgrp_Xnr routines below
530 */
531
532 union {
533 pid_t pgrp __deprecated;
534 pid_t __pgrp;
535 };
536
ab521dc0 537 struct pid *tty_old_pgrp;
1ec320af
CLG		 538
539 union {
540 pid_t session __deprecated;
541 pid_t __session;
542 };
543
1da177e4
LT		 544 /* boolean value for session group leader */
545 int leader;
546
547 struct tty_struct *tty; /* NULL if no tty */
548
549 /*
550 * Cumulative resource counters for dead threads in the group,
551 * and for reaped dead child processes forked by this group.
552 * Live threads maintain their own counters and add to these
553 * in __exit_signal, except for the group leader.
554 */
f06febc9 555 cputime_t cutime, cstime;
9ac52315
LV		 556 cputime_t gtime;
557 cputime_t cgtime;
1da177e4
LT		 558 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
559 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
6eaeeaba 560 unsigned long inblock, oublock, cinblock, coublock;
940389b8 561 struct task_io_accounting ioac;
1da177e4 562
1da177e4
LT		 563 /*
564 * We don't bother to synchronize most readers of this at all,
565 * because there is no reader checking a limit that actually needs
566 * to get both rlim_cur and rlim_max atomically, and either one
567 * alone is a single word that can safely be read normally.
568 * getrlimit/setrlimit use task_lock(current->group_leader) to
569 * protect this instead of the siglock, because they really
570 * have no need to disable irqs.
571 */
572 struct rlimit rlim[RLIM_NLIMITS];
573
0e464814
KK		 574#ifdef CONFIG_BSD_PROCESS_ACCT
575 struct pacct_struct pacct; /* per-process accounting information */
576#endif
ad4ecbcb 577#ifdef CONFIG_TASKSTATS
ad4ecbcb
SN		 578 struct taskstats *stats;
579#endif
522ed776
MT		 580#ifdef CONFIG_AUDIT
581 unsigned audit_tty;
582 struct tty_audit_buf *tty_audit_buf;
583#endif
1da177e4
LT		 584};
585
4866cde0
NP		 586/* Context switch must be unlocked if interrupts are to be enabled */
587#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
588# define __ARCH_WANT_UNLOCKED_CTXSW
589#endif
590
1da177e4
LT		 591/*
592 * Bits in flags field of signal_struct.
593 */
594#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
595#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
596#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
597#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
e4420551
ON		 598/*
599 * Pending notifications to parent.
600 */
601#define SIGNAL_CLD_STOPPED 0x00000010
602#define SIGNAL_CLD_CONTINUED 0x00000020
603#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
1da177e4 604
fae5fa44
ON		 605#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
606
ed5d2cac
ON		 607/* If true, all threads except ->group_exit_task have pending SIGKILL */
608static inline int signal_group_exit(const struct signal_struct *sig)
609{
610 return (sig->flags & SIGNAL_GROUP_EXIT) ||
611 (sig->group_exit_task != NULL);
612}
613
1da177e4
LT		 614/*
615 * Some day this will be a full-fledged user tracking system..
616 */
617struct user_struct {
618 atomic_t __count; /* reference count */
619 atomic_t processes; /* How many processes does this user have? */
620 atomic_t files; /* How many open files does this user have? */
621 atomic_t sigpending; /* How many pending signals does this user have? */
2d9048e2 622#ifdef CONFIG_INOTIFY_USER
0eeca283
RL		 623 atomic_t inotify_watches; /* How many inotify watches does this user have? */
624 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
625#endif
970a8645 626#ifdef CONFIG_POSIX_MQUEUE
1da177e4
LT		 627 /* protected by mq_lock */
628 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
970a8645 629#endif
1da177e4
LT		 630 unsigned long locked_shm; /* How many pages of mlocked shm ? */
631
632#ifdef CONFIG_KEYS
633 struct key *uid_keyring; /* UID specific keyring */
634 struct key *session_keyring; /* UID's default session keyring */
635#endif
636
637 /* Hash table maintenance information */
735de223 638 struct hlist_node uidhash_node;
1da177e4 639 uid_t uid;
24e377a8 640
052f1dc7 641#ifdef CONFIG_USER_SCHED
4cf86d77 642 struct task_group *tg;
b1a8c172 643#ifdef CONFIG_SYSFS
eb41d946 644 struct kobject kobj;
5cb350ba 645 struct work_struct work;
24e377a8 646#endif
b1a8c172 647#endif
1da177e4
LT		 648};
649
eb41d946 650extern int uids_sysfs_init(void);
5cb350ba 651
1da177e4
LT		 652extern struct user_struct *find_user(uid_t);
653
654extern struct user_struct root_user;
655#define INIT_USER (&root_user)
656
b6dff3ec 657
1da177e4
LT		 658struct backing_dev_info;
659struct reclaim_state;
660
52f17b6c 661#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1da177e4
LT		 662struct sched_info {
663 /* cumulative counters */
2d72376b 664 unsigned long pcount; /* # of times run on this cpu */
172ba844
BS		 665 unsigned long long cpu_time, /* time spent on the cpu */
666 run_delay; /* time spent waiting on a runqueue */
1da177e4
LT		 667
668 /* timestamps */
172ba844
BS		 669 unsigned long long last_arrival,/* when we last ran on a cpu */
670 last_queued; /* when we were last queued to run */
b8efb561
IM		 671#ifdef CONFIG_SCHEDSTATS
672 /* BKL stats */
480b9434 673 unsigned int bkl_count;
b8efb561 674#endif
1da177e4 675};
52f17b6c 676#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
1da177e4 677
ca74e92b
SN		 678#ifdef CONFIG_TASK_DELAY_ACCT
679struct task_delay_info {
680 spinlock_t lock;
681 unsigned int flags; /* Private per-task flags */
682
683 /* For each stat XXX, add following, aligned appropriately
684 *
685 * struct timespec XXX_start, XXX_end;
686 * u64 XXX_delay;
687 * u32 XXX_count;
688 *
689 * Atomicity of updates to XXX_delay, XXX_count protected by
690 * single lock above (split into XXX_lock if contention is an issue).
691 */
0ff92245
SN		 692
693 /*
694 * XXX_count is incremented on every XXX operation, the delay
695 * associated with the operation is added to XXX_delay.
696 * XXX_delay contains the accumulated delay time in nanoseconds.
697 */
698 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
699 u64 blkio_delay; /* wait for sync block io completion */
700 u64 swapin_delay; /* wait for swapin block io completion */
701 u32 blkio_count; /* total count of the number of sync block */
702 /* io operations performed */
703 u32 swapin_count; /* total count of the number of swapin block */
704 /* io operations performed */
873b4771
KK		 705
706 struct timespec freepages_start, freepages_end;
707 u64 freepages_delay; /* wait for memory reclaim */
708 u32 freepages_count; /* total count of memory reclaim */
ca74e92b 709};
52f17b6c
CS		 710#endif /* CONFIG_TASK_DELAY_ACCT */
711
712static inline int sched_info_on(void)
713{
714#ifdef CONFIG_SCHEDSTATS
715 return 1;
716#elif defined(CONFIG_TASK_DELAY_ACCT)
717 extern int delayacct_on;
718 return delayacct_on;
719#else
720 return 0;
ca74e92b 721#endif
52f17b6c 722}
ca74e92b 723
d15bcfdb
IM		 724enum cpu_idle_type {
725 CPU_IDLE,
726 CPU_NOT_IDLE,
727 CPU_NEWLY_IDLE,
728 CPU_MAX_IDLE_TYPES
1da177e4
LT		 729};
730
731/*
732 * sched-domains (multiprocessor balancing) declarations:
733 */
9aa7b369
IM		 734
735/*
736 * Increase resolution of nice-level calculations:
737 */
738#define SCHED_LOAD_SHIFT 10
739#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
740
f8700df7 741#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
1da177e4 742
2dd73a4f 743#ifdef CONFIG_SMP
1da177e4
LT		 744#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
745#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
746#define SD_BALANCE_EXEC 4 /* Balance on exec */
147cbb4b
NP		 747#define SD_BALANCE_FORK 8 /* Balance on fork, clone */
748#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
749#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
750#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
751#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
5c45bf27 752#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
89c4710e 753#define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
08c183f3 754#define SD_SERIALIZE 1024 /* Only a single load balancing instance */
1d3504fc 755#define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
5c45bf27 756
89c4710e
SS		 757#define BALANCE_FOR_MC_POWER \
758 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
759
760#define BALANCE_FOR_PKG_POWER \
761 ((sched_mc_power_savings || sched_smt_power_savings) ? \
762 SD_POWERSAVINGS_BALANCE : 0)
763
764#define test_sd_parent(sd, flag) ((sd->parent && \
765 (sd->parent->flags & flag)) ? 1 : 0)
5c45bf27 766
1da177e4
LT		 767
768struct sched_group {
769 struct sched_group *next; /* Must be a circular list */
770 cpumask_t cpumask;
771
772 /*
773 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
774 * single CPU. This is read only (except for setup, hotplug CPU).
5517d86b 775 * Note : Never change cpu_power without recompute its reciprocal
1da177e4 776 */
5517d86b
ED		 777 unsigned int __cpu_power;
778 /*
779 * reciprocal value of cpu_power to avoid expensive divides
780 * (see include/linux/reciprocal_div.h)
781 */
782 u32 reciprocal_cpu_power;
1da177e4
LT		 783};
784
1d3504fc
HS		 785enum sched_domain_level {
786 SD_LV_NONE = 0,
787 SD_LV_SIBLING,
788 SD_LV_MC,
789 SD_LV_CPU,
790 SD_LV_NODE,
791 SD_LV_ALLNODES,
792 SD_LV_MAX
793};
794
795struct sched_domain_attr {
796 int relax_domain_level;
797};
798
799#define SD_ATTR_INIT (struct sched_domain_attr) { \
800 .relax_domain_level = -1, \
801}
802
1da177e4
LT		 803struct sched_domain {
804 /* These fields must be setup */
805 struct sched_domain *parent; /* top domain must be null terminated */
1a848870 806 struct sched_domain *child; /* bottom domain must be null terminated */
1da177e4
LT		 807 struct sched_group *groups; /* the balancing groups of the domain */
808 cpumask_t span; /* span of all CPUs in this domain */
809 unsigned long min_interval; /* Minimum balance interval ms */
810 unsigned long max_interval; /* Maximum balance interval ms */
811 unsigned int busy_factor; /* less balancing by factor if busy */
812 unsigned int imbalance_pct; /* No balance until over watermark */
1da177e4 813 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
7897986b
NP		 814 unsigned int busy_idx;
815 unsigned int idle_idx;
816 unsigned int newidle_idx;
817 unsigned int wake_idx;
147cbb4b 818 unsigned int forkexec_idx;
1da177e4 819 int flags; /* See SD_* */
1d3504fc 820 enum sched_domain_level level;
1da177e4
LT		 821
822 /* Runtime fields. */
823 unsigned long last_balance; /* init to jiffies. units in jiffies */
824 unsigned int balance_interval; /* initialise to 1. units in ms. */
825 unsigned int nr_balance_failed; /* initialise to 0 */
826
2398f2c6
PZ		 827 u64 last_update;
828
1da177e4
LT		 829#ifdef CONFIG_SCHEDSTATS
830 /* load_balance() stats */
480b9434
KC		 831 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
832 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
833 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
834 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
835 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
836 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
837 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
838 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
1da177e4
LT		 839
840 /* Active load balancing */
480b9434
KC		 841 unsigned int alb_count;
842 unsigned int alb_failed;
843 unsigned int alb_pushed;
1da177e4 844
68767a0a 845 /* SD_BALANCE_EXEC stats */
480b9434
KC		 846 unsigned int sbe_count;
847 unsigned int sbe_balanced;
848 unsigned int sbe_pushed;
1da177e4 849
68767a0a 850 /* SD_BALANCE_FORK stats */
480b9434
KC		 851 unsigned int sbf_count;
852 unsigned int sbf_balanced;
853 unsigned int sbf_pushed;
68767a0a 854
1da177e4 855 /* try_to_wake_up() stats */
480b9434
KC		 856 unsigned int ttwu_wake_remote;
857 unsigned int ttwu_move_affine;
858 unsigned int ttwu_move_balance;
1da177e4 859#endif
a5d8c348
IM		 860#ifdef CONFIG_SCHED_DEBUG
861 char *name;
862#endif
1da177e4
LT		 863};
864
1d3504fc
HS		 865extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
866 struct sched_domain_attr *dattr_new);
9aefd0ab 867extern int arch_reinit_sched_domains(void);
029190c5 868
1b427c15
IM		 869#else /* CONFIG_SMP */
870
871struct sched_domain_attr;
872
873static inline void
874partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
875 struct sched_domain_attr *dattr_new)
876{
877}
878#endif /* !CONFIG_SMP */
1da177e4 879
1da177e4 880struct io_context; /* See blkdev.h */
1da177e4 881
1da177e4 882
383f2835 883#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
36c8b586 884extern void prefetch_stack(struct task_struct *t);
383f2835
CK		 885#else
886static inline void prefetch_stack(struct task_struct *t) { }
887#endif
1da177e4
LT		 888
889struct audit_context; /* See audit.c */
890struct mempolicy;
b92ce558 891struct pipe_inode_info;
4865ecf1 892struct uts_namespace;
1da177e4 893
20b8a59f
IM		 894struct rq;
895struct sched_domain;
896
897struct sched_class {
5522d5d5 898 const struct sched_class *next;
20b8a59f 899
fd390f6a 900 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
f02231e5 901 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
4530d7ab 902 void (*yield_task) (struct rq *rq);
20b8a59f 903
15afe09b 904 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync);
20b8a59f 905
fb8d4724 906 struct task_struct * (*pick_next_task) (struct rq *rq);
31ee529c 907 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
20b8a59f 908
681f3e68 909#ifdef CONFIG_SMP
4ce72a2c
LZ		 910 int (*select_task_rq)(struct task_struct *p, int sync);
911
43010659 912 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
e1d1484f 913 struct rq *busiest, unsigned long max_load_move,
20b8a59f 914 struct sched_domain *sd, enum cpu_idle_type idle,
a4ac01c3 915 int *all_pinned, int *this_best_prio);
20b8a59f 916
e1d1484f
PW		 917 int (*move_one_task) (struct rq *this_rq, int this_cpu,
918 struct rq *busiest, struct sched_domain *sd,
919 enum cpu_idle_type idle);
9a897c5a
SR		 920 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
921 void (*post_schedule) (struct rq *this_rq);
922 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
e1d1484f 923
cd8ba7cd
MT		 924 void (*set_cpus_allowed)(struct task_struct *p,
925 const cpumask_t *newmask);
57d885fe 926
1f11eb6a
GH		 927 void (*rq_online)(struct rq *rq);
928 void (*rq_offline)(struct rq *rq);
4ce72a2c
LZ		 929#endif
930
931 void (*set_curr_task) (struct rq *rq);
932 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
933 void (*task_new) (struct rq *rq, struct task_struct *p);
cb469845
SR		 934
935 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
936 int running);
937 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
938 int running);
939 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
940 int oldprio, int running);
810b3817
PZ		 941
942#ifdef CONFIG_FAIR_GROUP_SCHED
943 void (*moved_group) (struct task_struct *p);
944#endif
20b8a59f
IM		 945};
946
947struct load_weight {
948 unsigned long weight, inv_weight;
949};
950
951/*
952 * CFS stats for a schedulable entity (task, task-group etc)
953 *
954 * Current field usage histogram:
955 *
956 * 4 se->block_start
957 * 4 se->run_node
958 * 4 se->sleep_start
20b8a59f 959 * 6 se->load.weight
20b8a59f
IM		 960 */
961struct sched_entity {
20b8a59f
IM		 962 struct load_weight load; /* for load-balancing */
963 struct rb_node run_node;
4a55bd5e 964 struct list_head group_node;
20b8a59f
IM		 965 unsigned int on_rq;
966
94c18227
IM		 967 u64 exec_start;
968 u64 sum_exec_runtime;
e9acbff6 969 u64 vruntime;
f6cf891c 970 u64 prev_sum_exec_runtime;
94c18227 971
4ae7d5ce
IM		 972 u64 last_wakeup;
973 u64 avg_overlap;
974
94c18227 975#ifdef CONFIG_SCHEDSTATS
20b8a59f 976 u64 wait_start;
94c18227 977 u64 wait_max;
6d082592
AV		 978 u64 wait_count;
979 u64 wait_sum;
94c18227 980
20b8a59f 981 u64 sleep_start;
20b8a59f 982 u64 sleep_max;
94c18227
IM		 983 s64 sum_sleep_runtime;
984
985 u64 block_start;
20b8a59f
IM		 986 u64 block_max;
987 u64 exec_max;
eba1ed4b 988 u64 slice_max;
cc367732
IM		 989
990 u64 nr_migrations;
991 u64 nr_migrations_cold;
992 u64 nr_failed_migrations_affine;
993 u64 nr_failed_migrations_running;
994 u64 nr_failed_migrations_hot;
995 u64 nr_forced_migrations;
996 u64 nr_forced2_migrations;
997
998 u64 nr_wakeups;
999 u64 nr_wakeups_sync;
1000 u64 nr_wakeups_migrate;
1001 u64 nr_wakeups_local;
1002 u64 nr_wakeups_remote;
1003 u64 nr_wakeups_affine;
1004 u64 nr_wakeups_affine_attempts;
1005 u64 nr_wakeups_passive;
1006 u64 nr_wakeups_idle;
94c18227
IM		 1007#endif
1008
20b8a59f
IM		 1009#ifdef CONFIG_FAIR_GROUP_SCHED
1010 struct sched_entity *parent;
1011 /* rq on which this entity is (to be) queued: */
1012 struct cfs_rq *cfs_rq;
1013 /* rq "owned" by this entity/group: */
1014 struct cfs_rq *my_q;
1015#endif
1016};
70b97a7f 1017
fa717060
PZ		 1018struct sched_rt_entity {
1019 struct list_head run_list;
78f2c7db 1020 unsigned long timeout;
bee367ed 1021 unsigned int time_slice;
6f505b16
PZ		 1022 int nr_cpus_allowed;
1023
58d6c2d7 1024 struct sched_rt_entity *back;
052f1dc7 1025#ifdef CONFIG_RT_GROUP_SCHED
6f505b16
PZ		 1026 struct sched_rt_entity *parent;
1027 /* rq on which this entity is (to be) queued: */
1028 struct rt_rq *rt_rq;
1029 /* rq "owned" by this entity/group: */
1030 struct rt_rq *my_q;
1031#endif
fa717060
PZ		 1032};
1033
1da177e4
LT		 1034struct task_struct {
1035 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
f7e4217b 1036 void *stack;
1da177e4 1037 atomic_t usage;
97dc32cd
WC		 1038 unsigned int flags; /* per process flags, defined below */
1039 unsigned int ptrace;
1da177e4 1040
36772092 1041 int lock_depth; /* BKL lock depth */
1da177e4 1042
2dd73a4f
PW		 1043#ifdef CONFIG_SMP
1044#ifdef __ARCH_WANT_UNLOCKED_CTXSW
4866cde0
NP		 1045 int oncpu;
1046#endif
2dd73a4f 1047#endif
50e645a8 1048
b29739f9 1049 int prio, static_prio, normal_prio;
c7aceaba 1050 unsigned int rt_priority;
5522d5d5 1051 const struct sched_class *sched_class;
20b8a59f 1052 struct sched_entity se;
fa717060 1053 struct sched_rt_entity rt;
1da177e4 1054
e107be36
AK		 1055#ifdef CONFIG_PREEMPT_NOTIFIERS
1056 /* list of struct preempt_notifier: */
1057 struct hlist_head preempt_notifiers;
1058#endif
1059
18796aa0
AD		 1060 /*
1061 * fpu_counter contains the number of consecutive context switches
1062 * that the FPU is used. If this is over a threshold, the lazy fpu
1063 * saving becomes unlazy to save the trap. This is an unsigned char
1064 * so that after 256 times the counter wraps and the behavior turns
1065 * lazy again; this to deal with bursty apps that only use FPU for
1066 * a short time
1067 */
1068 unsigned char fpu_counter;
1069 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
6c5c9341 1070#ifdef CONFIG_BLK_DEV_IO_TRACE
2056a782 1071 unsigned int btrace_seq;
6c5c9341 1072#endif
1da177e4 1073
97dc32cd 1074 unsigned int policy;
1da177e4 1075 cpumask_t cpus_allowed;
1da177e4 1076
e260be67
PM		 1077#ifdef CONFIG_PREEMPT_RCU
1078 int rcu_read_lock_nesting;
1079 int rcu_flipctr_idx;
1080#endif /* #ifdef CONFIG_PREEMPT_RCU */
1081
52f17b6c 1082#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1da177e4
LT		 1083 struct sched_info sched_info;
1084#endif
1085
1086 struct list_head tasks;
1da177e4
LT		 1087
1088 struct mm_struct *mm, *active_mm;
1089
1090/* task state */
1091 struct linux_binfmt *binfmt;
97dc32cd 1092 int exit_state;
1da177e4
LT		 1093 int exit_code, exit_signal;
1094 int pdeath_signal; /* The signal sent when the parent dies */
1095 /* ??? */
97dc32cd 1096 unsigned int personality;
1da177e4
LT		 1097 unsigned did_exec:1;
1098 pid_t pid;
1099 pid_t tgid;
0a425405
AV		 1100
1101#ifdef CONFIG_CC_STACKPROTECTOR
1102 /* Canary value for the -fstack-protector gcc feature */
1103 unsigned long stack_canary;
1104#endif
1da177e4
LT		 1105 /*
1106 * pointers to (original) parent process, youngest child, younger sibling,
1107 * older sibling, respectively. (p->father can be replaced with
f470021a 1108 * p->real_parent->pid)
1da177e4 1109 */
f470021a
RM		 1110 struct task_struct *real_parent; /* real parent process */
1111 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1da177e4 1112 /*
f470021a 1113 * children/sibling forms the list of my natural children
1da177e4
LT		 1114 */
1115 struct list_head children; /* list of my children */
1116 struct list_head sibling; /* linkage in my parent's children list */
1117 struct task_struct *group_leader; /* threadgroup leader */
1118
f470021a
RM		 1119 /*
1120 * ptraced is the list of tasks this task is using ptrace on.
1121 * This includes both natural children and PTRACE_ATTACH targets.
1122 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1123 */
1124 struct list_head ptraced;
1125 struct list_head ptrace_entry;
1126
1da177e4 1127 /* PID/PID hash table linkage. */
92476d7f 1128 struct pid_link pids[PIDTYPE_MAX];
47e65328 1129 struct list_head thread_group;
1da177e4
LT		 1130
1131 struct completion *vfork_done; /* for vfork() */
1132 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1133 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1134
c66f08be 1135 cputime_t utime, stime, utimescaled, stimescaled;
9ac52315 1136 cputime_t gtime;
9301899b 1137 cputime_t prev_utime, prev_stime;
1da177e4 1138 unsigned long nvcsw, nivcsw; /* context switch counts */
924b42d5
TJ		 1139 struct timespec start_time; /* monotonic time */
1140 struct timespec real_start_time; /* boot based time */
1da177e4
LT		 1141/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1142 unsigned long min_flt, maj_flt;
1143
f06febc9 1144 struct task_cputime cputime_expires;
1da177e4
LT		 1145 struct list_head cpu_timers[3];
1146
1147/* process credentials */
b6dff3ec
DH		 1148 struct cred *cred; /* actual/objective task credentials */
1149
36772092
PBG		 1150 char comm[TASK_COMM_LEN]; /* executable name excluding path
1151 - access with [gs]et_task_comm (which lock
1152 it with task_lock())
1153 - initialized normally by flush_old_exec */
1da177e4
LT		 1154/* file system info */
1155 int link_count, total_link_count;
3d5b6fcc 1156#ifdef CONFIG_SYSVIPC
1da177e4
LT		 1157/* ipc stuff */
1158 struct sysv_sem sysvsem;
3d5b6fcc 1159#endif
82a1fcb9
IM		 1160#ifdef CONFIG_DETECT_SOFTLOCKUP
1161/* hung task detection */
1162 unsigned long last_switch_timestamp;
1163 unsigned long last_switch_count;
1164#endif
1da177e4
LT		 1165/* CPU-specific state of this task */
1166 struct thread_struct thread;
1167/* filesystem information */
1168 struct fs_struct *fs;
1169/* open file information */
1170 struct files_struct *files;
1651e14e 1171/* namespaces */
ab516013 1172 struct nsproxy *nsproxy;
1da177e4
LT		 1173/* signal handlers */
1174 struct signal_struct *signal;
1175 struct sighand_struct *sighand;
1176
1177 sigset_t blocked, real_blocked;
f3de272b 1178 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1da177e4
LT		 1179 struct sigpending pending;
1180
1181 unsigned long sas_ss_sp;
1182 size_t sas_ss_size;
1183 int (*notifier)(void *priv);
1184 void *notifier_data;
1185 sigset_t *notifier_mask;
1da177e4 1186 struct audit_context *audit_context;
bfef93a5
AV		 1187#ifdef CONFIG_AUDITSYSCALL
1188 uid_t loginuid;
4746ec5b 1189 unsigned int sessionid;
bfef93a5 1190#endif
1da177e4
LT		 1191 seccomp_t seccomp;
1192
1193/* Thread group tracking */
1194 u32 parent_exec_id;
1195 u32 self_exec_id;
1196/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1197 spinlock_t alloc_lock;
1da177e4 1198
b29739f9
IM		 1199 /* Protection of the PI data structures: */
1200 spinlock_t pi_lock;
1201
23f78d4a
IM		 1202#ifdef CONFIG_RT_MUTEXES
1203 /* PI waiters blocked on a rt_mutex held by this task */
1204 struct plist_head pi_waiters;
1205 /* Deadlock detection and priority inheritance handling */
1206 struct rt_mutex_waiter *pi_blocked_on;
23f78d4a
IM		 1207#endif
1208
408894ee
IM		 1209#ifdef CONFIG_DEBUG_MUTEXES
1210 /* mutex deadlock detection */
1211 struct mutex_waiter *blocked_on;
1212#endif
de30a2b3
IM		 1213#ifdef CONFIG_TRACE_IRQFLAGS
1214 unsigned int irq_events;
1215 int hardirqs_enabled;
1216 unsigned long hardirq_enable_ip;
1217 unsigned int hardirq_enable_event;
1218 unsigned long hardirq_disable_ip;
1219 unsigned int hardirq_disable_event;
1220 int softirqs_enabled;
1221 unsigned long softirq_disable_ip;
1222 unsigned int softirq_disable_event;
1223 unsigned long softirq_enable_ip;
1224 unsigned int softirq_enable_event;
1225 int hardirq_context;
1226 int softirq_context;
1227#endif
fbb9ce95 1228#ifdef CONFIG_LOCKDEP
bdb9441e 1229# define MAX_LOCK_DEPTH 48UL
fbb9ce95
IM		 1230 u64 curr_chain_key;
1231 int lockdep_depth;
fbb9ce95 1232 unsigned int lockdep_recursion;
c7aceaba 1233 struct held_lock held_locks[MAX_LOCK_DEPTH];
fbb9ce95 1234#endif
408894ee 1235
1da177e4
LT		 1236/* journalling filesystem info */
1237 void *journal_info;
1238
d89d8796
NB		 1239/* stacked block device info */
1240 struct bio *bio_list, **bio_tail;
1241
1da177e4
LT		 1242/* VM state */
1243 struct reclaim_state *reclaim_state;
1244
1da177e4
LT		 1245 struct backing_dev_info *backing_dev_info;
1246
1247 struct io_context *io_context;
1248
1249 unsigned long ptrace_message;
1250 siginfo_t *last_siginfo; /* For ptrace use. */
940389b8 1251 struct task_io_accounting ioac;
8f0ab514 1252#if defined(CONFIG_TASK_XACCT)
1da177e4
LT		 1253 u64 acct_rss_mem1; /* accumulated rss usage */
1254 u64 acct_vm_mem1; /* accumulated virtual memory usage */
49b5cf34 1255 cputime_t acct_timexpd; /* stime + utime since last update */
1da177e4 1256#endif
1da177e4 1257#ifdef CONFIG_CPUSETS
1da177e4
LT		 1258 nodemask_t mems_allowed;
1259 int cpuset_mems_generation;
825a46af 1260 int cpuset_mem_spread_rotor;
1da177e4 1261#endif
ddbcc7e8 1262#ifdef CONFIG_CGROUPS
817929ec
PM		 1263 /* Control Group info protected by css_set_lock */
1264 struct css_set *cgroups;
1265 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1266 struct list_head cg_list;
ddbcc7e8 1267#endif
42b2dd0a 1268#ifdef CONFIG_FUTEX
0771dfef 1269 struct robust_list_head __user *robust_list;
34f192c6
IM		 1270#ifdef CONFIG_COMPAT
1271 struct compat_robust_list_head __user *compat_robust_list;
1272#endif
c87e2837
IM		 1273 struct list_head pi_state_list;
1274 struct futex_pi_state *pi_state_cache;
c7aceaba
RK		 1275#endif
1276#ifdef CONFIG_NUMA
1277 struct mempolicy *mempolicy;
1278 short il_next;
42b2dd0a 1279#endif
22e2c507 1280 atomic_t fs_excl; /* holding fs exclusive resources */
e56d0903 1281 struct rcu_head rcu;
b92ce558
JA		 1282
1283 /*
1284 * cache last used pipe for splice
1285 */
1286 struct pipe_inode_info *splice_pipe;
ca74e92b
SN		 1287#ifdef CONFIG_TASK_DELAY_ACCT
1288 struct task_delay_info *delays;
f4f154fd
AM		 1289#endif
1290#ifdef CONFIG_FAULT_INJECTION
1291 int make_it_fail;
ca74e92b 1292#endif
3e26c149 1293 struct prop_local_single dirties;
9745512c
AV		 1294#ifdef CONFIG_LATENCYTOP
1295 int latency_record_count;
1296 struct latency_record latency_record[LT_SAVECOUNT];
1297#endif
6976675d
AV		 1298 /*
1299 * time slack values; these are used to round up poll() and
1300 * select() etc timeout values. These are in nanoseconds.
1301 */
1302 unsigned long timer_slack_ns;
1303 unsigned long default_timer_slack_ns;
1da177e4
LT		 1304};
1305
e05606d3
IM		 1306/*
1307 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1308 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1309 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1310 * values are inverted: lower p->prio value means higher priority.
1311 *
1312 * The MAX_USER_RT_PRIO value allows the actual maximum
1313 * RT priority to be separate from the value exported to
1314 * user-space. This allows kernel threads to set their
1315 * priority to a value higher than any user task. Note:
1316 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1317 */
1318
1319#define MAX_USER_RT_PRIO 100
1320#define MAX_RT_PRIO MAX_USER_RT_PRIO
1321
1322#define MAX_PRIO (MAX_RT_PRIO + 40)
1323#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1324
1325static inline int rt_prio(int prio)
1326{
1327 if (unlikely(prio < MAX_RT_PRIO))
1328 return 1;
1329 return 0;
1330}
1331
e868171a 1332static inline int rt_task(struct task_struct *p)
e05606d3
IM		 1333{
1334 return rt_prio(p->prio);
1335}
1336
a47afb0f 1337static inline void set_task_session(struct task_struct *tsk, pid_t session)
937949d9 1338{
a47afb0f 1339 tsk->signal->__session = session;
937949d9
CLG		 1340}
1341
9a2e7057
PE		 1342static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1343{
1344 tsk->signal->__pgrp = pgrp;
1345}
1346
e868171a 1347static inline struct pid *task_pid(struct task_struct *task)
22c935f4
EB		 1348{
1349 return task->pids[PIDTYPE_PID].pid;
1350}
1351
e868171a 1352static inline struct pid *task_tgid(struct task_struct *task)
22c935f4
EB		 1353{
1354 return task->group_leader->pids[PIDTYPE_PID].pid;
1355}
1356
e868171a 1357static inline struct pid *task_pgrp(struct task_struct *task)
22c935f4
EB		 1358{
1359 return task->group_leader->pids[PIDTYPE_PGID].pid;
1360}
1361
e868171a 1362static inline struct pid *task_session(struct task_struct *task)
22c935f4
EB		 1363{
1364 return task->group_leader->pids[PIDTYPE_SID].pid;
1365}
1366
7af57294
PE		 1367struct pid_namespace;
1368
1369/*
1370 * the helpers to get the task's different pids as they are seen
1371 * from various namespaces
1372 *
1373 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
44c4e1b2
EB		 1374 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1375 * current.
7af57294
PE		 1376 * task_xid_nr_ns() : id seen from the ns specified;
1377 *
1378 * set_task_vxid() : assigns a virtual id to a task;
1379 *
7af57294
PE		 1380 * see also pid_nr() etc in include/linux/pid.h
1381 */
1382
e868171a 1383static inline pid_t task_pid_nr(struct task_struct *tsk)
7af57294
PE		 1384{
1385 return tsk->pid;
1386}
1387
2f2a3a46 1388pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
7af57294
PE		 1389
1390static inline pid_t task_pid_vnr(struct task_struct *tsk)
1391{
1392 return pid_vnr(task_pid(tsk));
1393}
1394
1395
e868171a 1396static inline pid_t task_tgid_nr(struct task_struct *tsk)
7af57294
PE		 1397{
1398 return tsk->tgid;
1399}
1400
2f2a3a46 1401pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
7af57294
PE		 1402
1403static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1404{
1405 return pid_vnr(task_tgid(tsk));
1406}
1407
1408
e868171a 1409static inline pid_t task_pgrp_nr(struct task_struct *tsk)
7af57294 1410{
9a2e7057 1411 return tsk->signal->__pgrp;
7af57294
PE		 1412}
1413
2f2a3a46 1414pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
7af57294
PE		 1415
1416static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1417{
1418 return pid_vnr(task_pgrp(tsk));
1419}
1420
1421
e868171a 1422static inline pid_t task_session_nr(struct task_struct *tsk)
7af57294
PE		 1423{
1424 return tsk->signal->__session;
1425}
1426
2f2a3a46 1427pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
7af57294
PE		 1428
1429static inline pid_t task_session_vnr(struct task_struct *tsk)
1430{
1431 return pid_vnr(task_session(tsk));
1432}
1433
1434
1da177e4
LT		 1435/**
1436 * pid_alive - check that a task structure is not stale
1437 * @p: Task structure to be checked.
1438 *
1439 * Test if a process is not yet dead (at most zombie state)
1440 * If pid_alive fails, then pointers within the task structure
1441 * can be stale and must not be dereferenced.
1442 */
e868171a 1443static inline int pid_alive(struct task_struct *p)
1da177e4 1444{
92476d7f 1445 return p->pids[PIDTYPE_PID].pid != NULL;
1da177e4
LT		 1446}
1447
f400e198 1448/**
b460cbc5 1449 * is_global_init - check if a task structure is init
3260259f
H		 1450 * @tsk: Task structure to be checked.
1451 *
1452 * Check if a task structure is the first user space task the kernel created.
b460cbc5 1453 */
e868171a 1454static inline int is_global_init(struct task_struct *tsk)
b461cc03
PE		 1455{
1456 return tsk->pid == 1;
1457}
b460cbc5
SH		 1458
1459/*
1460 * is_container_init:
1461 * check whether in the task is init in its own pid namespace.
f400e198 1462 */
b461cc03 1463extern int is_container_init(struct task_struct *tsk);
f400e198 1464
9ec52099
CLG		 1465extern struct pid *cad_pid;
1466
1da177e4 1467extern void free_task(struct task_struct *tsk);
1da177e4 1468#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
e56d0903 1469
158d9ebd 1470extern void __put_task_struct(struct task_struct *t);
e56d0903
IM		 1471
1472static inline void put_task_struct(struct task_struct *t)
1473{
1474 if (atomic_dec_and_test(&t->usage))
8c7904a0 1475 __put_task_struct(t);
e56d0903 1476}
1da177e4 1477
49048622
BS		 1478extern cputime_t task_utime(struct task_struct *p);
1479extern cputime_t task_stime(struct task_struct *p);
1480extern cputime_t task_gtime(struct task_struct *p);
1481
1da177e4
LT		 1482/*
1483 * Per process flags
1484 */
1485#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1486 /* Not implemented yet, only for 486*/
1487#define PF_STARTING 0x00000002 /* being created */
1488#define PF_EXITING 0x00000004 /* getting shut down */
778e9a9c 1489#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
94886b84 1490#define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1da177e4
LT		 1491#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1492#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1493#define PF_DUMPCORE 0x00000200 /* dumped core */
1494#define PF_SIGNALED 0x00000400 /* killed by a signal */
1495#define PF_MEMALLOC 0x00000800 /* Allocating memory */
1496#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1497#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1da177e4
LT		 1498#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1499#define PF_FROZEN 0x00010000 /* frozen for system suspend */
1500#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1501#define PF_KSWAPD 0x00040000 /* I am kswapd */
1502#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1503#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
246bb0b1 1504#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
b31dc66a
JA		 1505#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1506#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1507#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1508#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
9985b0ba 1509#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
c61afb18 1510#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
61a87122 1511#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
ba96a0c8 1512#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
ebb12db5 1513#define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1da177e4
LT		 1514
1515/*
1516 * Only the _current_ task can read/write to tsk->flags, but other
1517 * tasks can access tsk->flags in readonly mode for example
1518 * with tsk_used_math (like during threaded core dumping).
1519 * There is however an exception to this rule during ptrace
1520 * or during fork: the ptracer task is allowed to write to the
1521 * child->flags of its traced child (same goes for fork, the parent
1522 * can write to the child->flags), because we're guaranteed the
1523 * child is not running and in turn not changing child->flags
1524 * at the same time the parent does it.
1525 */
1526#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1527#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1528#define clear_used_math() clear_stopped_child_used_math(current)
1529#define set_used_math() set_stopped_child_used_math(current)
1530#define conditional_stopped_child_used_math(condition, child) \
1531 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1532#define conditional_used_math(condition) \
1533 conditional_stopped_child_used_math(condition, current)
1534#define copy_to_stopped_child_used_math(child) \
1535 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1536/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1537#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1538#define used_math() tsk_used_math(current)
1539
1540#ifdef CONFIG_SMP
cd8ba7cd
MT		 1541extern int set_cpus_allowed_ptr(struct task_struct *p,
1542 const cpumask_t *new_mask);
1da177e4 1543#else
cd8ba7cd
MT		 1544static inline int set_cpus_allowed_ptr(struct task_struct *p,
1545 const cpumask_t *new_mask)
1da177e4 1546{
cd8ba7cd 1547 if (!cpu_isset(0, *new_mask))
1da177e4
LT		 1548 return -EINVAL;
1549 return 0;
1550}
1551#endif
cd8ba7cd
MT		 1552static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1553{
1554 return set_cpus_allowed_ptr(p, &new_mask);
1555}
1da177e4
LT		 1556
1557extern unsigned long long sched_clock(void);
e436d800 1558
c1955a3d
PZ		 1559extern void sched_clock_init(void);
1560extern u64 sched_clock_cpu(int cpu);
3e51f33f 1561
c1955a3d 1562#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
3e51f33f
PZ		 1563static inline void sched_clock_tick(void)
1564{
1565}
1566
1567static inline void sched_clock_idle_sleep_event(void)
1568{
1569}
1570
1571static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1572{
1573}
e4e4e534 1574#else
3e51f33f
PZ		 1575extern void sched_clock_tick(void);
1576extern void sched_clock_idle_sleep_event(void);
1577extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1578#endif
1579
e436d800
IM		 1580/*
1581 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1582 * clock constructed from sched_clock():
1583 */
1584extern unsigned long long cpu_clock(int cpu);
1585
36c8b586 1586extern unsigned long long
41b86e9c 1587task_sched_runtime(struct task_struct *task);
f06febc9 1588extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1da177e4
LT		 1589
1590/* sched_exec is called by processes performing an exec */
1591#ifdef CONFIG_SMP
1592extern void sched_exec(void);
1593#else
1594#define sched_exec() {}
1595#endif
1596
2aa44d05
IM		 1597extern void sched_clock_idle_sleep_event(void);
1598extern void sched_clock_idle_wakeup_event(u64 delta_ns);
bb29ab26 1599
1da177e4
LT		 1600#ifdef CONFIG_HOTPLUG_CPU
1601extern void idle_task_exit(void);
1602#else
1603static inline void idle_task_exit(void) {}
1604#endif
1605
1606extern void sched_idle_next(void);
b29739f9 1607
06d8308c
TG		 1608#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1609extern void wake_up_idle_cpu(int cpu);
1610#else
1611static inline void wake_up_idle_cpu(int cpu) { }
1612#endif
1613
2bd8e6d4 1614#ifdef CONFIG_SCHED_DEBUG
21805085 1615extern unsigned int sysctl_sched_latency;
b2be5e96 1616extern unsigned int sysctl_sched_min_granularity;
bf0f6f24 1617extern unsigned int sysctl_sched_wakeup_granularity;
bf0f6f24
IM		 1618extern unsigned int sysctl_sched_child_runs_first;
1619extern unsigned int sysctl_sched_features;
da84d961 1620extern unsigned int sysctl_sched_migration_cost;
b82d9fdd 1621extern unsigned int sysctl_sched_nr_migrate;
2398f2c6 1622extern unsigned int sysctl_sched_shares_ratelimit;
ffda12a1 1623extern unsigned int sysctl_sched_shares_thresh;
b2be5e96
PZ		 1624
1625int sched_nr_latency_handler(struct ctl_table *table, int write,
1626 struct file *file, void __user *buffer, size_t *length,
1627 loff_t *ppos);
2bd8e6d4 1628#endif
9f0c1e56
PZ		 1629extern unsigned int sysctl_sched_rt_period;
1630extern int sysctl_sched_rt_runtime;
2bd8e6d4 1631
d0b27fa7
PZ		 1632int sched_rt_handler(struct ctl_table *table, int write,
1633 struct file *filp, void __user *buffer, size_t *lenp,
1634 loff_t *ppos);
1635
2bd8e6d4 1636extern unsigned int sysctl_sched_compat_yield;
bf0f6f24 1637
b29739f9 1638#ifdef CONFIG_RT_MUTEXES
36c8b586
IM		 1639extern int rt_mutex_getprio(struct task_struct *p);
1640extern void rt_mutex_setprio(struct task_struct *p, int prio);
1641extern void rt_mutex_adjust_pi(struct task_struct *p);
b29739f9 1642#else
e868171a 1643static inline int rt_mutex_getprio(struct task_struct *p)
b29739f9
IM		 1644{
1645 return p->normal_prio;
1646}
95e02ca9 1647# define rt_mutex_adjust_pi(p) do { } while (0)
b29739f9
IM		 1648#endif
1649
36c8b586
IM		 1650extern void set_user_nice(struct task_struct *p, long nice);
1651extern int task_prio(const struct task_struct *p);
1652extern int task_nice(const struct task_struct *p);
1653extern int can_nice(const struct task_struct *p, const int nice);
1654extern int task_curr(const struct task_struct *p);
1da177e4
LT		 1655extern int idle_cpu(int cpu);
1656extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
961ccddd
RR		 1657extern int sched_setscheduler_nocheck(struct task_struct *, int,
1658 struct sched_param *);
36c8b586
IM		 1659extern struct task_struct *idle_task(int cpu);
1660extern struct task_struct *curr_task(int cpu);
1661extern void set_curr_task(int cpu, struct task_struct *p);
1da177e4
LT		 1662
1663void yield(void);
1664
1665/*
1666 * The default (Linux) execution domain.
1667 */
1668extern struct exec_domain default_exec_domain;
1669
1670union thread_union {
1671 struct thread_info thread_info;
1672 unsigned long stack[THREAD_SIZE/sizeof(long)];
1673};
1674
1675#ifndef __HAVE_ARCH_KSTACK_END
1676static inline int kstack_end(void *addr)
1677{
1678 /* Reliable end of stack detection:
1679 * Some APM bios versions misalign the stack
1680 */
1681 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1682}
1683#endif
1684
1685extern union thread_union init_thread_union;
1686extern struct task_struct init_task;
1687
1688extern struct mm_struct init_mm;
1689
198fe21b
PE		 1690extern struct pid_namespace init_pid_ns;
1691
1692/*
1693 * find a task by one of its numerical ids
1694 *
1695 * find_task_by_pid_type_ns():
1696 * it is the most generic call - it finds a task by all id,
1697 * type and namespace specified
1698 * find_task_by_pid_ns():
1699 * finds a task by its pid in the specified namespace
228ebcbe
PE		 1700 * find_task_by_vpid():
1701 * finds a task by its virtual pid
198fe21b 1702 *
e49859e7 1703 * see also find_vpid() etc in include/linux/pid.h
198fe21b
PE		 1704 */
1705
1706extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1707 struct pid_namespace *ns);
1708
228ebcbe
PE		 1709extern struct task_struct *find_task_by_vpid(pid_t nr);
1710extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1711 struct pid_namespace *ns);
198fe21b 1712
8520d7c7 1713extern void __set_special_pids(struct pid *pid);
1da177e4
LT		 1714
1715/* per-UID process charging. */
acce292c 1716extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1da177e4
LT		 1717static inline struct user_struct *get_uid(struct user_struct *u)
1718{
1719 atomic_inc(&u->__count);
1720 return u;
1721}
1722extern void free_uid(struct user_struct *);
1723extern void switch_uid(struct user_struct *);
28f300d2 1724extern void release_uids(struct user_namespace *ns);
1da177e4
LT		 1725
1726#include <asm/current.h>
1727
3171a030 1728extern void do_timer(unsigned long ticks);
1da177e4 1729
b3c97528
HH		 1730extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1731extern int wake_up_process(struct task_struct *tsk);
1732extern void wake_up_new_task(struct task_struct *tsk,
1733 unsigned long clone_flags);
1da177e4
LT		 1734#ifdef CONFIG_SMP
1735 extern void kick_process(struct task_struct *tsk);
1736#else
1737 static inline void kick_process(struct task_struct *tsk) { }
1738#endif
ad46c2c4
IM		 1739extern void sched_fork(struct task_struct *p, int clone_flags);
1740extern void sched_dead(struct task_struct *p);
1da177e4 1741
1da177e4
LT		 1742extern void proc_caches_init(void);
1743extern void flush_signals(struct task_struct *);
10ab825b 1744extern void ignore_signals(struct task_struct *);
1da177e4
LT		 1745extern void flush_signal_handlers(struct task_struct *, int force_default);
1746extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1747
1748static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1749{
1750 unsigned long flags;
1751 int ret;
1752
1753 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1754 ret = dequeue_signal(tsk, mask, info);
1755 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1756
1757 return ret;
1758}
1759
1760extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1761 sigset_t *mask);
1762extern void unblock_all_signals(void);
1763extern void release_task(struct task_struct * p);
1764extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1da177e4
LT		 1765extern int force_sigsegv(int, struct task_struct *);
1766extern int force_sig_info(int, struct siginfo *, struct task_struct *);
c4b92fc1 1767extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
c4b92fc1 1768extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2425c08b 1769extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
c4b92fc1
EB		 1770extern int kill_pgrp(struct pid *pid, int sig, int priv);
1771extern int kill_pid(struct pid *pid, int sig, int priv);
c3de4b38 1772extern int kill_proc_info(int, struct siginfo *, pid_t);
2b2a1ff6 1773extern int do_notify_parent(struct task_struct *, int);
1da177e4
LT		 1774extern void force_sig(int, struct task_struct *);
1775extern void force_sig_specific(int, struct task_struct *);
1776extern int send_sig(int, struct task_struct *, int);
1777extern void zap_other_threads(struct task_struct *p);
1da177e4
LT		 1778extern struct sigqueue *sigqueue_alloc(void);
1779extern void sigqueue_free(struct sigqueue *);
ac5c2153 1780extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
9ac95f2f 1781extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1da177e4
LT		 1782extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1783
9ec52099
CLG		 1784static inline int kill_cad_pid(int sig, int priv)
1785{
1786 return kill_pid(cad_pid, sig, priv);
1787}
1788
1da177e4
LT		 1789/* These can be the second arg to send_sig_info/send_group_sig_info. */
1790#define SEND_SIG_NOINFO ((struct siginfo *) 0)
1791#define SEND_SIG_PRIV ((struct siginfo *) 1)
1792#define SEND_SIG_FORCED ((struct siginfo *) 2)
1793
621d3121
ON		 1794static inline int is_si_special(const struct siginfo *info)
1795{
1796 return info <= SEND_SIG_FORCED;
1797}
1798
1da177e4
LT		 1799/* True if we are on the alternate signal stack. */
1800
1801static inline int on_sig_stack(unsigned long sp)
1802{
1803 return (sp - current->sas_ss_sp < current->sas_ss_size);
1804}
1805
1806static inline int sas_ss_flags(unsigned long sp)
1807{
1808 return (current->sas_ss_size == 0 ? SS_DISABLE
1809 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1810}
1811
1da177e4
LT		 1812/*
1813 * Routines for handling mm_structs
1814 */
1815extern struct mm_struct * mm_alloc(void);
1816
1817/* mmdrop drops the mm and the page tables */
b3c97528 1818extern void __mmdrop(struct mm_struct *);
1da177e4
LT		 1819static inline void mmdrop(struct mm_struct * mm)
1820{
6fb43d7b 1821 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1da177e4
LT		 1822 __mmdrop(mm);
1823}
1824
1825/* mmput gets rid of the mappings and all user-space */
1826extern void mmput(struct mm_struct *);
1827/* Grab a reference to a task's mm, if it is not already going away */
1828extern struct mm_struct *get_task_mm(struct task_struct *task);
1829/* Remove the current tasks stale references to the old mm_struct */
1830extern void mm_release(struct task_struct *, struct mm_struct *);
402b0862
CO		 1831/* Allocate a new mm structure and copy contents from tsk->mm */
1832extern struct mm_struct *dup_mm(struct task_struct *tsk);
1da177e4
LT		 1833
1834extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1835extern void flush_thread(void);
1836extern void exit_thread(void);
1837
1da177e4 1838extern void exit_files(struct task_struct *);
6b3934ef 1839extern void __cleanup_signal(struct signal_struct *);
a7e5328a 1840extern void __cleanup_sighand(struct sighand_struct *);
cbaffba1 1841
1da177e4 1842extern void exit_itimers(struct signal_struct *);
cbaffba1 1843extern void flush_itimer_signals(void);
1da177e4
LT		 1844
1845extern NORET_TYPE void do_group_exit(int);
1846
1da177e4
LT		 1847extern void daemonize(const char *, ...);
1848extern int allow_signal(int);
1849extern int disallow_signal(int);
1da177e4
LT		 1850
1851extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1852extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
36c8b586 1853struct task_struct *fork_idle(int);
1da177e4
LT		 1854
1855extern void set_task_comm(struct task_struct *tsk, char *from);
59714d65 1856extern char *get_task_comm(char *to, struct task_struct *tsk);
1da177e4
LT		 1857
1858#ifdef CONFIG_SMP
85ba2d86 1859extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
1da177e4 1860#else
85ba2d86
RM		 1861static inline unsigned long wait_task_inactive(struct task_struct *p,
1862 long match_state)
1863{
1864 return 1;
1865}
1da177e4
LT		 1866#endif
1867
5e85d4ab 1868#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1da177e4
LT		 1869
1870#define for_each_process(p) \
1871 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1872
1873/*
1874 * Careful: do_each_thread/while_each_thread is a double loop so
1875 * 'break' will not work as expected - use goto instead.
1876 */
1877#define do_each_thread(g, t) \
1878 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1879
1880#define while_each_thread(g, t) \
1881 while ((t = next_thread(t)) != g)
1882
de12a787
EB		 1883/* de_thread depends on thread_group_leader not being a pid based check */
1884#define thread_group_leader(p) (p == p->group_leader)
1da177e4 1885
0804ef4b
EB		 1886/* Do to the insanities of de_thread it is possible for a process
1887 * to have the pid of the thread group leader without actually being
1888 * the thread group leader. For iteration through the pids in proc
1889 * all we care about is that we have a task with the appropriate
1890 * pid, we don't actually care if we have the right task.
1891 */
e868171a 1892static inline int has_group_leader_pid(struct task_struct *p)
0804ef4b
EB		 1893{
1894 return p->pid == p->tgid;
1895}
1896
bac0abd6
PE		 1897static inline
1898int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1899{
1900 return p1->tgid == p2->tgid;
1901}
1902
36c8b586 1903static inline struct task_struct *next_thread(const struct task_struct *p)
47e65328
ON		 1904{
1905 return list_entry(rcu_dereference(p->thread_group.next),
36c8b586 1906 struct task_struct, thread_group);
47e65328
ON		 1907}
1908
e868171a 1909static inline int thread_group_empty(struct task_struct *p)
1da177e4 1910{
47e65328 1911 return list_empty(&p->thread_group);
1da177e4
LT		 1912}
1913
1914#define delay_group_leader(p) \
1915 (thread_group_leader(p) && !thread_group_empty(p))
1916
1da177e4 1917/*
260ea101 1918 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
22e2c507 1919 * subscriptions and synchronises with wait4(). Also used in procfs. Also
ddbcc7e8
PM		 1920 * pins the final release of task.io_context. Also protects ->cpuset and
1921 * ->cgroup.subsys[].
1da177e4
LT		 1922 *
1923 * Nests both inside and outside of read_lock(&tasklist_lock).
1924 * It must not be nested with write_lock_irq(&tasklist_lock),
1925 * neither inside nor outside.
1926 */
1927static inline void task_lock(struct task_struct *p)
1928{
1929 spin_lock(&p->alloc_lock);
1930}
1931
1932static inline void task_unlock(struct task_struct *p)
1933{
1934 spin_unlock(&p->alloc_lock);
1935}
1936
f63ee72e
ON		 1937extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1938 unsigned long *flags);
1939
1940static inline void unlock_task_sighand(struct task_struct *tsk,
1941 unsigned long *flags)
1942{
1943 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1944}
1945
f037360f
AV		 1946#ifndef __HAVE_THREAD_FUNCTIONS
1947
f7e4217b
RZ		 1948#define task_thread_info(task) ((struct thread_info *)(task)->stack)
1949#define task_stack_page(task) ((task)->stack)
a1261f54 1950
10ebffde
AV		 1951static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1952{
1953 *task_thread_info(p) = *task_thread_info(org);
1954 task_thread_info(p)->task = p;
1955}
1956
1957static inline unsigned long *end_of_stack(struct task_struct *p)
1958{
f7e4217b 1959 return (unsigned long *)(task_thread_info(p) + 1);
10ebffde
AV		 1960}
1961
f037360f
AV		 1962#endif
1963
8b05c7e6
FT		 1964static inline int object_is_on_stack(void *obj)
1965{
1966 void *stack = task_stack_page(current);
1967
1968 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
1969}
1970
8c9843e5
BH		 1971extern void thread_info_cache_init(void);
1972
1da177e4
LT		 1973/* set thread flags in other task's structures
1974 * - see asm/thread_info.h for TIF_xxxx flags available
1975 */
1976static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1977{
a1261f54 1978 set_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 1979}
1980
1981static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1982{
a1261f54 1983 clear_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 1984}
1985
1986static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1987{
a1261f54 1988 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 1989}
1990
1991static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1992{
a1261f54 1993 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 1994}
1995
1996static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1997{
a1261f54 1998 return test_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 1999}
2000
2001static inline void set_tsk_need_resched(struct task_struct *tsk)
2002{
2003 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2004}
2005
2006static inline void clear_tsk_need_resched(struct task_struct *tsk)
2007{
2008 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2009}
2010
8ae121ac
GH		 2011static inline int test_tsk_need_resched(struct task_struct *tsk)
2012{
2013 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2014}
2015
1da177e4
LT		 2016static inline int signal_pending(struct task_struct *p)
2017{
2018 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2019}
f776d12d 2020
b3c97528 2021extern int __fatal_signal_pending(struct task_struct *p);
f776d12d
MW		 2022
2023static inline int fatal_signal_pending(struct task_struct *p)
2024{
2025 return signal_pending(p) && __fatal_signal_pending(p);
2026}
2027
16882c1e
ON		 2028static inline int signal_pending_state(long state, struct task_struct *p)
2029{
2030 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2031 return 0;
2032 if (!signal_pending(p))
2033 return 0;
2034
16882c1e
ON		 2035 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2036}
2037
1da177e4
LT		 2038static inline int need_resched(void)
2039{
9404ef02 2040 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1da177e4
LT		 2041}
2042
2043/*
2044 * cond_resched() and cond_resched_lock(): latency reduction via
2045 * explicit rescheduling in places that are safe. The return
2046 * value indicates whether a reschedule was done in fact.
2047 * cond_resched_lock() will drop the spinlock before scheduling,
2048 * cond_resched_softirq() will enable bhs before scheduling.
2049 */
c3921ab7 2050extern int _cond_resched(void);
c714a534 2051#ifdef CONFIG_PREEMPT_BKL
02b67cc3
HX		 2052static inline int cond_resched(void)
2053{
2054 return 0;
2055}
2056#else
02b67cc3
HX		 2057static inline int cond_resched(void)
2058{
2059 return _cond_resched();
2060}
2061#endif
1da177e4
LT		 2062extern int cond_resched_lock(spinlock_t * lock);
2063extern int cond_resched_softirq(void);
c3921ab7
LT		 2064static inline int cond_resched_bkl(void)
2065{
2066 return _cond_resched();
2067}
1da177e4
LT		 2068
2069/*
2070 * Does a critical section need to be broken due to another
95c354fe
NP		 2071 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2072 * but a general need for low latency)
1da177e4 2073 */
95c354fe 2074static inline int spin_needbreak(spinlock_t *lock)
1da177e4 2075{
95c354fe
NP		 2076#ifdef CONFIG_PREEMPT
2077 return spin_is_contended(lock);
2078#else
1da177e4 2079 return 0;
95c354fe 2080#endif
1da177e4
LT		 2081}
2082
f06febc9
FM		 2083/*
2084 * Thread group CPU time accounting.
2085 */
f06febc9 2086
bb34d92f
FM		 2087extern int thread_group_cputime_alloc(struct task_struct *);
2088extern void thread_group_cputime(struct task_struct *, struct task_cputime *);
f06febc9
FM		 2089
2090static inline void thread_group_cputime_init(struct signal_struct *sig)
2091{
2092 sig->cputime.totals = NULL;
2093}
2094
bb34d92f 2095static inline int thread_group_cputime_clone_thread(struct task_struct *curr)
f06febc9
FM		 2096{
2097 if (curr->signal->cputime.totals)
2098 return 0;
bb34d92f 2099 return thread_group_cputime_alloc(curr);
f06febc9
FM		 2100}
2101
f06febc9
FM		 2102static inline void thread_group_cputime_free(struct signal_struct *sig)
2103{
bb34d92f 2104 free_percpu(sig->cputime.totals);
f06febc9
FM		 2105}
2106
7bb44ade
RM		 2107/*
2108 * Reevaluate whether the task has signals pending delivery.
2109 * Wake the task if so.
2110 * This is required every time the blocked sigset_t changes.
2111 * callers must hold sighand->siglock.
2112 */
2113extern void recalc_sigpending_and_wake(struct task_struct *t);
1da177e4
LT		 2114extern void recalc_sigpending(void);
2115
2116extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2117
2118/*
2119 * Wrappers for p->thread_info->cpu access. No-op on UP.
2120 */
2121#ifdef CONFIG_SMP
2122
2123static inline unsigned int task_cpu(const struct task_struct *p)
2124{
a1261f54 2125 return task_thread_info(p)->cpu;
1da177e4
LT		 2126}
2127
c65cc870 2128extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
1da177e4
LT		 2129
2130#else
2131
2132static inline unsigned int task_cpu(const struct task_struct *p)
2133{
2134 return 0;
2135}
2136
2137static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2138{
2139}
2140
2141#endif /* CONFIG_SMP */
2142
1da177e4 2143extern void arch_pick_mmap_layout(struct mm_struct *mm);
1da177e4 2144
1a3c3034
IM		 2145#ifdef CONFIG_TRACING
2146extern void
2147__trace_special(void *__tr, void *__data,
2148 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2149#else
2150static inline void
2151__trace_special(void *__tr, void *__data,
2152 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2153{
2154}
2155#endif
2156
b53e921b 2157extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
1da177e4
LT		 2158extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
2159
5c45bf27 2160extern int sched_mc_power_savings, sched_smt_power_savings;
5c45bf27 2161
1da177e4
LT		 2162extern void normalize_rt_tasks(void);
2163
052f1dc7 2164#ifdef CONFIG_GROUP_SCHED
9b5b7751 2165
4cf86d77 2166extern struct task_group init_task_group;
eff766a6
PZ		 2167#ifdef CONFIG_USER_SCHED
2168extern struct task_group root_task_group;
2169#endif
9b5b7751 2170
ec7dc8ac 2171extern struct task_group *sched_create_group(struct task_group *parent);
4cf86d77 2172extern void sched_destroy_group(struct task_group *tg);
9b5b7751 2173extern void sched_move_task(struct task_struct *tsk);
052f1dc7 2174#ifdef CONFIG_FAIR_GROUP_SCHED
4cf86d77 2175extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
5cb350ba 2176extern unsigned long sched_group_shares(struct task_group *tg);
052f1dc7
PZ		 2177#endif
2178#ifdef CONFIG_RT_GROUP_SCHED
9f0c1e56
PZ		 2179extern int sched_group_set_rt_runtime(struct task_group *tg,
2180 long rt_runtime_us);
2181extern long sched_group_rt_runtime(struct task_group *tg);
d0b27fa7
PZ		 2182extern int sched_group_set_rt_period(struct task_group *tg,
2183 long rt_period_us);
2184extern long sched_group_rt_period(struct task_group *tg);
052f1dc7 2185#endif
9b5b7751
SV		 2186#endif
2187
4b98d11b
AD		 2188#ifdef CONFIG_TASK_XACCT
2189static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2190{
940389b8 2191 tsk->ioac.rchar += amt;
4b98d11b
AD		 2192}
2193
2194static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2195{
940389b8 2196 tsk->ioac.wchar += amt;
4b98d11b
AD		 2197}
2198
2199static inline void inc_syscr(struct task_struct *tsk)
2200{
940389b8 2201 tsk->ioac.syscr++;
4b98d11b
AD		 2202}
2203
2204static inline void inc_syscw(struct task_struct *tsk)
2205{
940389b8 2206 tsk->ioac.syscw++;
4b98d11b
AD		 2207}
2208#else
2209static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2210{
2211}
2212
2213static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2214{
2215}
2216
2217static inline void inc_syscr(struct task_struct *tsk)
2218{
2219}
2220
2221static inline void inc_syscw(struct task_struct *tsk)
2222{
2223}
2224#endif
2225
82455257
DH		 2226#ifndef TASK_SIZE_OF
2227#define TASK_SIZE_OF(tsk) TASK_SIZE
2228#endif
2229
cf475ad2
BS		 2230#ifdef CONFIG_MM_OWNER
2231extern void mm_update_next_owner(struct mm_struct *mm);
2232extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2233#else
2234static inline void mm_update_next_owner(struct mm_struct *mm)
2235{
2236}
2237
2238static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2239{
2240}
2241#endif /* CONFIG_MM_OWNER */
2242
7c731e0a
SR		 2243#define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2244
1da177e4
LT		 2245#endif /* __KERNEL__ */
2246
2247#endif
Linux 6.x block layer and io_uring tree(s)