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
/* 0x02000000 was previously the unused CLONE_STOPPED (Start in stopped state)
25
and is now available for re-use. */
26
#define CLONE_NEWUTS 0x04000000 /* New utsname group? */
27
#define CLONE_NEWIPC 0x08000000 /* New ipcs */
28
#define CLONE_NEWUSER 0x10000000 /* New user namespace */
29
#define CLONE_NEWPID 0x20000000 /* New pid namespace */
30
#define CLONE_NEWNET 0x40000000 /* New network namespace */
31
#define CLONE_IO 0x80000000 /* Clone io context */
36
#define SCHED_NORMAL 0
40
/* SCHED_ISO: reserved but not implemented yet */
42
/* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
43
#define SCHED_RESET_ON_FORK 0x40000000
51
#include <asm/param.h> /* for HZ */
53
#include <linux/capability.h>
54
#include <linux/threads.h>
55
#include <linux/kernel.h>
56
#include <linux/types.h>
57
#include <linux/timex.h>
58
#include <linux/jiffies.h>
59
#include <linux/rbtree.h>
60
#include <linux/thread_info.h>
61
#include <linux/cpumask.h>
62
#include <linux/errno.h>
63
#include <linux/nodemask.h>
64
#include <linux/mm_types.h>
66
#include <asm/system.h>
68
#include <asm/ptrace.h>
69
#include <asm/cputime.h>
71
#include <linux/smp.h>
72
#include <linux/sem.h>
73
#include <linux/signal.h>
74
#include <linux/compiler.h>
75
#include <linux/completion.h>
76
#include <linux/pid.h>
77
#include <linux/percpu.h>
78
#include <linux/topology.h>
79
#include <linux/proportions.h>
80
#include <linux/seccomp.h>
81
#include <linux/rcupdate.h>
82
#include <linux/rculist.h>
83
#include <linux/rtmutex.h>
85
#include <linux/time.h>
86
#include <linux/param.h>
87
#include <linux/resource.h>
88
#include <linux/timer.h>
89
#include <linux/hrtimer.h>
90
#include <linux/task_io_accounting.h>
91
#include <linux/latencytop.h>
92
#include <linux/cred.h>
93
#include <linux/llist.h>
95
#include <asm/processor.h>
98
struct futex_pi_state;
99
struct robust_list_head;
102
struct perf_event_context;
106
* List of flags we want to share for kernel threads,
107
* if only because they are not used by them anyway.
109
#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
112
* These are the constant used to fake the fixed-point load-average
113
* counting. Some notes:
114
* - 11 bit fractions expand to 22 bits by the multiplies: this gives
115
* a load-average precision of 10 bits integer + 11 bits fractional
116
* - if you want to count load-averages more often, you need more
117
* precision, or rounding will get you. With 2-second counting freq,
118
* the EXP_n values would be 1981, 2034 and 2043 if still using only
121
extern unsigned long avenrun[]; /* Load averages */
122
extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
124
#define FSHIFT 11 /* nr of bits of precision */
125
#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
126
#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
127
#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
128
#define EXP_5 2014 /* 1/exp(5sec/5min) */
129
#define EXP_15 2037 /* 1/exp(5sec/15min) */
131
#define CALC_LOAD(load,exp,n) \
133
load += n*(FIXED_1-exp); \
136
extern unsigned long total_forks;
137
extern int nr_threads;
138
DECLARE_PER_CPU(unsigned long, process_counts);
139
extern int nr_processes(void);
140
extern unsigned long nr_running(void);
141
extern unsigned long nr_uninterruptible(void);
142
extern unsigned long nr_iowait(void);
143
extern unsigned long nr_iowait_cpu(int cpu);
144
extern unsigned long this_cpu_load(void);
147
extern void calc_global_load(unsigned long ticks);
149
extern unsigned long get_parent_ip(unsigned long addr);
154
#ifdef CONFIG_SCHED_DEBUG
155
extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
156
extern void proc_sched_set_task(struct task_struct *p);
158
print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
161
proc_sched_show_task(struct task_struct *p, struct seq_file *m)
164
static inline void proc_sched_set_task(struct task_struct *p)
168
print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
174
* Task state bitmask. NOTE! These bits are also
175
* encoded in fs/proc/array.c: get_task_state().
177
* We have two separate sets of flags: task->state
178
* is about runnability, while task->exit_state are
179
* about the task exiting. Confusing, but this way
180
* modifying one set can't modify the other one by
183
#define TASK_RUNNING 0
184
#define TASK_INTERRUPTIBLE 1
185
#define TASK_UNINTERRUPTIBLE 2
186
#define __TASK_STOPPED 4
187
#define __TASK_TRACED 8
188
/* in tsk->exit_state */
189
#define EXIT_ZOMBIE 16
191
/* in tsk->state again */
193
#define TASK_WAKEKILL 128
194
#define TASK_WAKING 256
195
#define TASK_STATE_MAX 512
197
#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
199
extern char ___assert_task_state[1 - 2*!!(
200
sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
202
/* Convenience macros for the sake of set_task_state */
203
#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
204
#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
205
#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
207
/* Convenience macros for the sake of wake_up */
208
#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
209
#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
211
/* get_task_state() */
212
#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
213
TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
216
#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
217
#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
218
#define task_is_dead(task) ((task)->exit_state != 0)
219
#define task_is_stopped_or_traced(task) \
220
((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
221
#define task_contributes_to_load(task) \
222
((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
223
(task->flags & PF_FREEZING) == 0)
225
#define __set_task_state(tsk, state_value) \
226
do { (tsk)->state = (state_value); } while (0)
227
#define set_task_state(tsk, state_value) \
228
set_mb((tsk)->state, (state_value))
231
* set_current_state() includes a barrier so that the write of current->state
232
* is correctly serialised wrt the caller's subsequent test of whether to
235
* set_current_state(TASK_UNINTERRUPTIBLE);
236
* if (do_i_need_to_sleep())
239
* If the caller does not need such serialisation then use __set_current_state()
241
#define __set_current_state(state_value) \
242
do { current->state = (state_value); } while (0)
243
#define set_current_state(state_value) \
244
set_mb(current->state, (state_value))
246
/* Task command name length */
247
#define TASK_COMM_LEN 16
249
#include <linux/spinlock.h>
252
* This serializes "schedule()" and also protects
253
* the run-queue from deletions/modifications (but
254
* _adding_ to the beginning of the run-queue has
257
extern rwlock_t tasklist_lock;
258
extern spinlock_t mmlist_lock;
262
#ifdef CONFIG_PROVE_RCU
263
extern int lockdep_tasklist_lock_is_held(void);
264
#endif /* #ifdef CONFIG_PROVE_RCU */
266
extern void sched_init(void);
267
extern void sched_init_smp(void);
268
extern asmlinkage void schedule_tail(struct task_struct *prev);
269
extern void init_idle(struct task_struct *idle, int cpu);
270
extern void init_idle_bootup_task(struct task_struct *idle);
272
extern int runqueue_is_locked(int cpu);
274
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
275
extern void select_nohz_load_balancer(int stop_tick);
276
extern int get_nohz_timer_target(void);
278
static inline void select_nohz_load_balancer(int stop_tick) { }
282
* Only dump TASK_* tasks. (0 for all tasks)
284
extern void show_state_filter(unsigned long state_filter);
286
static inline void show_state(void)
288
show_state_filter(0);
291
extern void show_regs(struct pt_regs *);
294
* TASK is a pointer to the task whose backtrace we want to see (or NULL for current
295
* task), SP is the stack pointer of the first frame that should be shown in the back
296
* trace (or NULL if the entire call-chain of the task should be shown).
298
extern void show_stack(struct task_struct *task, unsigned long *sp);
300
void io_schedule(void);
301
long io_schedule_timeout(long timeout);
303
extern void cpu_init (void);
304
extern void trap_init(void);
305
extern void update_process_times(int user);
306
extern void scheduler_tick(void);
308
extern void sched_show_task(struct task_struct *p);
310
#ifdef CONFIG_LOCKUP_DETECTOR
311
extern void touch_softlockup_watchdog(void);
312
extern void touch_softlockup_watchdog_sync(void);
313
extern void touch_all_softlockup_watchdogs(void);
314
extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
316
size_t *lenp, loff_t *ppos);
317
extern unsigned int softlockup_panic;
318
void lockup_detector_init(void);
320
static inline void touch_softlockup_watchdog(void)
323
static inline void touch_softlockup_watchdog_sync(void)
326
static inline void touch_all_softlockup_watchdogs(void)
329
static inline void lockup_detector_init(void)
334
#ifdef CONFIG_DETECT_HUNG_TASK
335
extern unsigned int sysctl_hung_task_panic;
336
extern unsigned long sysctl_hung_task_check_count;
337
extern unsigned long sysctl_hung_task_timeout_secs;
338
extern unsigned long sysctl_hung_task_warnings;
339
extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
341
size_t *lenp, loff_t *ppos);
343
/* Avoid need for ifdefs elsewhere in the code */
344
enum { sysctl_hung_task_timeout_secs = 0 };
347
/* Attach to any functions which should be ignored in wchan output. */
348
#define __sched __attribute__((__section__(".sched.text")))
350
/* Linker adds these: start and end of __sched functions */
351
extern char __sched_text_start[], __sched_text_end[];
353
/* Is this address in the __sched functions? */
354
extern int in_sched_functions(unsigned long addr);
356
#define MAX_SCHEDULE_TIMEOUT LONG_MAX
357
extern signed long schedule_timeout(signed long timeout);
358
extern signed long schedule_timeout_interruptible(signed long timeout);
359
extern signed long schedule_timeout_killable(signed long timeout);
360
extern signed long schedule_timeout_uninterruptible(signed long timeout);
361
asmlinkage void schedule(void);
362
extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);
365
struct user_namespace;
368
* Default maximum number of active map areas, this limits the number of vmas
369
* per mm struct. Users can overwrite this number by sysctl but there is a
372
* When a program's coredump is generated as ELF format, a section is created
373
* per a vma. In ELF, the number of sections is represented in unsigned short.
374
* This means the number of sections should be smaller than 65535 at coredump.
375
* Because the kernel adds some informative sections to a image of program at
376
* generating coredump, we need some margin. The number of extra sections is
377
* 1-3 now and depends on arch. We use "5" as safe margin, here.
379
#define MAPCOUNT_ELF_CORE_MARGIN (5)
380
#define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
382
extern int sysctl_max_map_count;
384
#include <linux/aio.h>
387
extern void arch_pick_mmap_layout(struct mm_struct *mm);
389
arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
390
unsigned long, unsigned long);
392
arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
393
unsigned long len, unsigned long pgoff,
394
unsigned long flags);
395
extern void arch_unmap_area(struct mm_struct *, unsigned long);
396
extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
398
static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
402
extern void set_dumpable(struct mm_struct *mm, int value);
403
extern int get_dumpable(struct mm_struct *mm);
407
#define MMF_DUMPABLE 0 /* core dump is permitted */
408
#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
410
#define MMF_DUMPABLE_BITS 2
411
#define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
413
/* coredump filter bits */
414
#define MMF_DUMP_ANON_PRIVATE 2
415
#define MMF_DUMP_ANON_SHARED 3
416
#define MMF_DUMP_MAPPED_PRIVATE 4
417
#define MMF_DUMP_MAPPED_SHARED 5
418
#define MMF_DUMP_ELF_HEADERS 6
419
#define MMF_DUMP_HUGETLB_PRIVATE 7
420
#define MMF_DUMP_HUGETLB_SHARED 8
422
#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
423
#define MMF_DUMP_FILTER_BITS 7
424
#define MMF_DUMP_FILTER_MASK \
425
(((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
426
#define MMF_DUMP_FILTER_DEFAULT \
427
((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
428
(1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
430
#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
431
# define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
433
# define MMF_DUMP_MASK_DEFAULT_ELF 0
435
/* leave room for more dump flags */
436
#define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
437
#define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
439
#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
441
struct sighand_struct {
443
struct k_sigaction action[_NSIG];
445
wait_queue_head_t signalfd_wqh;
448
struct pacct_struct {
451
unsigned long ac_mem;
452
cputime_t ac_utime, ac_stime;
453
unsigned long ac_minflt, ac_majflt;
464
* struct task_cputime - collected CPU time counts
465
* @utime: time spent in user mode, in &cputime_t units
466
* @stime: time spent in kernel mode, in &cputime_t units
467
* @sum_exec_runtime: total time spent on the CPU, in nanoseconds
469
* This structure groups together three kinds of CPU time that are
470
* tracked for threads and thread groups. Most things considering
471
* CPU time want to group these counts together and treat all three
472
* of them in parallel.
474
struct task_cputime {
477
unsigned long long sum_exec_runtime;
479
/* Alternate field names when used to cache expirations. */
480
#define prof_exp stime
481
#define virt_exp utime
482
#define sched_exp sum_exec_runtime
484
#define INIT_CPUTIME \
485
(struct task_cputime) { \
486
.utime = cputime_zero, \
487
.stime = cputime_zero, \
488
.sum_exec_runtime = 0, \
492
* Disable preemption until the scheduler is running.
493
* Reset by start_kernel()->sched_init()->init_idle().
495
* We include PREEMPT_ACTIVE to avoid cond_resched() from working
496
* before the scheduler is active -- see should_resched().
498
#define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
501
* struct thread_group_cputimer - thread group interval timer counts
502
* @cputime: thread group interval timers.
503
* @running: non-zero when there are timers running and
504
* @cputime receives updates.
505
* @lock: lock for fields in this struct.
507
* This structure contains the version of task_cputime, above, that is
508
* used for thread group CPU timer calculations.
510
struct thread_group_cputimer {
511
struct task_cputime cputime;
516
#include <linux/rwsem.h>
520
* NOTE! "signal_struct" does not have its own
521
* locking, because a shared signal_struct always
522
* implies a shared sighand_struct, so locking
523
* sighand_struct is always a proper superset of
524
* the locking of signal_struct.
526
struct signal_struct {
531
wait_queue_head_t wait_chldexit; /* for wait4() */
533
/* current thread group signal load-balancing target: */
534
struct task_struct *curr_target;
536
/* shared signal handling: */
537
struct sigpending shared_pending;
539
/* thread group exit support */
542
* - notify group_exit_task when ->count is equal to notify_count
543
* - everyone except group_exit_task is stopped during signal delivery
544
* of fatal signals, group_exit_task processes the signal.
547
struct task_struct *group_exit_task;
549
/* thread group stop support, overloads group_exit_code too */
550
int group_stop_count;
551
unsigned int flags; /* see SIGNAL_* flags below */
553
/* POSIX.1b Interval Timers */
554
struct list_head posix_timers;
556
/* ITIMER_REAL timer for the process */
557
struct hrtimer real_timer;
558
struct pid *leader_pid;
559
ktime_t it_real_incr;
562
* ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
563
* CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
564
* values are defined to 0 and 1 respectively
566
struct cpu_itimer it[2];
569
* Thread group totals for process CPU timers.
570
* See thread_group_cputimer(), et al, for details.
572
struct thread_group_cputimer cputimer;
574
/* Earliest-expiration cache. */
575
struct task_cputime cputime_expires;
577
struct list_head cpu_timers[3];
579
struct pid *tty_old_pgrp;
581
/* boolean value for session group leader */
584
struct tty_struct *tty; /* NULL if no tty */
586
#ifdef CONFIG_SCHED_AUTOGROUP
587
struct autogroup *autogroup;
590
* Cumulative resource counters for dead threads in the group,
591
* and for reaped dead child processes forked by this group.
592
* Live threads maintain their own counters and add to these
593
* in __exit_signal, except for the group leader.
595
cputime_t utime, stime, cutime, cstime;
598
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
599
cputime_t prev_utime, prev_stime;
601
unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
602
unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
603
unsigned long inblock, oublock, cinblock, coublock;
604
unsigned long maxrss, cmaxrss;
605
struct task_io_accounting ioac;
608
* Cumulative ns of schedule CPU time fo dead threads in the
609
* group, not including a zombie group leader, (This only differs
610
* from jiffies_to_ns(utime + stime) if sched_clock uses something
611
* other than jiffies.)
613
unsigned long long sum_sched_runtime;
616
* We don't bother to synchronize most readers of this at all,
617
* because there is no reader checking a limit that actually needs
618
* to get both rlim_cur and rlim_max atomically, and either one
619
* alone is a single word that can safely be read normally.
620
* getrlimit/setrlimit use task_lock(current->group_leader) to
621
* protect this instead of the siglock, because they really
622
* have no need to disable irqs.
624
struct rlimit rlim[RLIM_NLIMITS];
626
#ifdef CONFIG_BSD_PROCESS_ACCT
627
struct pacct_struct pacct; /* per-process accounting information */
629
#ifdef CONFIG_TASKSTATS
630
struct taskstats *stats;
634
struct tty_audit_buf *tty_audit_buf;
636
#ifdef CONFIG_CGROUPS
638
* The threadgroup_fork_lock prevents threads from forking with
639
* CLONE_THREAD while held for writing. Use this for fork-sensitive
640
* threadgroup-wide operations. It's taken for reading in fork.c in
642
* Currently only needed write-side by cgroups.
644
struct rw_semaphore threadgroup_fork_lock;
647
int oom_adj; /* OOM kill score adjustment (bit shift) */
648
int oom_score_adj; /* OOM kill score adjustment */
649
int oom_score_adj_min; /* OOM kill score adjustment minimum value.
650
* Only settable by CAP_SYS_RESOURCE. */
652
struct mutex cred_guard_mutex; /* guard against foreign influences on
653
* credential calculations
654
* (notably. ptrace) */
657
/* Context switch must be unlocked if interrupts are to be enabled */
658
#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
659
# define __ARCH_WANT_UNLOCKED_CTXSW
663
* Bits in flags field of signal_struct.
665
#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
666
#define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
667
#define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
669
* Pending notifications to parent.
671
#define SIGNAL_CLD_STOPPED 0x00000010
672
#define SIGNAL_CLD_CONTINUED 0x00000020
673
#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
675
#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
677
/* If true, all threads except ->group_exit_task have pending SIGKILL */
678
static inline int signal_group_exit(const struct signal_struct *sig)
680
return (sig->flags & SIGNAL_GROUP_EXIT) ||
681
(sig->group_exit_task != NULL);
685
* Some day this will be a full-fledged user tracking system..
688
atomic_t __count; /* reference count */
689
atomic_t processes; /* How many processes does this user have? */
690
atomic_t files; /* How many open files does this user have? */
691
atomic_t sigpending; /* How many pending signals does this user have? */
692
#ifdef CONFIG_INOTIFY_USER
693
atomic_t inotify_watches; /* How many inotify watches does this user have? */
694
atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
696
#ifdef CONFIG_FANOTIFY
697
atomic_t fanotify_listeners;
700
atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
702
#ifdef CONFIG_POSIX_MQUEUE
703
/* protected by mq_lock */
704
unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
706
unsigned long locked_shm; /* How many pages of mlocked shm ? */
709
struct key *uid_keyring; /* UID specific keyring */
710
struct key *session_keyring; /* UID's default session keyring */
713
/* Hash table maintenance information */
714
struct hlist_node uidhash_node;
716
struct user_namespace *user_ns;
718
#ifdef CONFIG_PERF_EVENTS
719
atomic_long_t locked_vm;
723
extern int uids_sysfs_init(void);
725
extern struct user_struct *find_user(uid_t);
727
extern struct user_struct root_user;
728
#define INIT_USER (&root_user)
731
struct backing_dev_info;
732
struct reclaim_state;
734
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
736
/* cumulative counters */
737
unsigned long pcount; /* # of times run on this cpu */
738
unsigned long long run_delay; /* time spent waiting on a runqueue */
741
unsigned long long last_arrival,/* when we last ran on a cpu */
742
last_queued; /* when we were last queued to run */
744
#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
746
#ifdef CONFIG_TASK_DELAY_ACCT
747
struct task_delay_info {
749
unsigned int flags; /* Private per-task flags */
751
/* For each stat XXX, add following, aligned appropriately
753
* struct timespec XXX_start, XXX_end;
757
* Atomicity of updates to XXX_delay, XXX_count protected by
758
* single lock above (split into XXX_lock if contention is an issue).
762
* XXX_count is incremented on every XXX operation, the delay
763
* associated with the operation is added to XXX_delay.
764
* XXX_delay contains the accumulated delay time in nanoseconds.
766
struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
767
u64 blkio_delay; /* wait for sync block io completion */
768
u64 swapin_delay; /* wait for swapin block io completion */
769
u32 blkio_count; /* total count of the number of sync block */
770
/* io operations performed */
771
u32 swapin_count; /* total count of the number of swapin block */
772
/* io operations performed */
774
struct timespec freepages_start, freepages_end;
775
u64 freepages_delay; /* wait for memory reclaim */
776
u32 freepages_count; /* total count of memory reclaim */
778
#endif /* CONFIG_TASK_DELAY_ACCT */
780
static inline int sched_info_on(void)
782
#ifdef CONFIG_SCHEDSTATS
784
#elif defined(CONFIG_TASK_DELAY_ACCT)
785
extern int delayacct_on;
800
* Increase resolution of nice-level calculations for 64-bit architectures.
801
* The extra resolution improves shares distribution and load balancing of
802
* low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
803
* hierarchies, especially on larger systems. This is not a user-visible change
804
* and does not change the user-interface for setting shares/weights.
806
* We increase resolution only if we have enough bits to allow this increased
807
* resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
808
* when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
811
#if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */
812
# define SCHED_LOAD_RESOLUTION 10
813
# define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION)
814
# define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION)
816
# define SCHED_LOAD_RESOLUTION 0
817
# define scale_load(w) (w)
818
# define scale_load_down(w) (w)
821
#define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION)
822
#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
825
* Increase resolution of cpu_power calculations
827
#define SCHED_POWER_SHIFT 10
828
#define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
831
* sched-domains (multiprocessor balancing) declarations:
834
#define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
835
#define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
836
#define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
837
#define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
838
#define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
839
#define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
840
#define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */
841
#define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
842
#define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */
843
#define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
844
#define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
845
#define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
846
#define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
847
#define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
849
enum powersavings_balance_level {
850
POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */
851
POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package
852
* first for long running threads
854
POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle
855
* cpu package for power savings
857
MAX_POWERSAVINGS_BALANCE_LEVELS
860
extern int sched_mc_power_savings, sched_smt_power_savings;
862
static inline int sd_balance_for_mc_power(void)
864
if (sched_smt_power_savings)
865
return SD_POWERSAVINGS_BALANCE;
867
if (!sched_mc_power_savings)
868
return SD_PREFER_SIBLING;
873
static inline int sd_balance_for_package_power(void)
875
if (sched_mc_power_savings | sched_smt_power_savings)
876
return SD_POWERSAVINGS_BALANCE;
878
return SD_PREFER_SIBLING;
881
extern int __weak arch_sd_sibiling_asym_packing(void);
884
* Optimise SD flags for power savings:
885
* SD_BALANCE_NEWIDLE helps aggressive task consolidation and power savings.
886
* Keep default SD flags if sched_{smt,mc}_power_saving=0
889
static inline int sd_power_saving_flags(void)
891
if (sched_mc_power_savings | sched_smt_power_savings)
892
return SD_BALANCE_NEWIDLE;
897
struct sched_group_power {
900
* CPU power of this group, SCHED_LOAD_SCALE being max power for a
903
unsigned int power, power_orig;
907
struct sched_group *next; /* Must be a circular list */
910
unsigned int group_weight;
911
struct sched_group_power *sgp;
914
* The CPUs this group covers.
916
* NOTE: this field is variable length. (Allocated dynamically
917
* by attaching extra space to the end of the structure,
918
* depending on how many CPUs the kernel has booted up with)
920
unsigned long cpumask[0];
923
static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
925
return to_cpumask(sg->cpumask);
928
struct sched_domain_attr {
929
int relax_domain_level;
932
#define SD_ATTR_INIT (struct sched_domain_attr) { \
933
.relax_domain_level = -1, \
936
extern int sched_domain_level_max;
938
struct sched_domain {
939
/* These fields must be setup */
940
struct sched_domain *parent; /* top domain must be null terminated */
941
struct sched_domain *child; /* bottom domain must be null terminated */
942
struct sched_group *groups; /* the balancing groups of the domain */
943
unsigned long min_interval; /* Minimum balance interval ms */
944
unsigned long max_interval; /* Maximum balance interval ms */
945
unsigned int busy_factor; /* less balancing by factor if busy */
946
unsigned int imbalance_pct; /* No balance until over watermark */
947
unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
948
unsigned int busy_idx;
949
unsigned int idle_idx;
950
unsigned int newidle_idx;
951
unsigned int wake_idx;
952
unsigned int forkexec_idx;
953
unsigned int smt_gain;
954
int flags; /* See SD_* */
957
/* Runtime fields. */
958
unsigned long last_balance; /* init to jiffies. units in jiffies */
959
unsigned int balance_interval; /* initialise to 1. units in ms. */
960
unsigned int nr_balance_failed; /* initialise to 0 */
964
#ifdef CONFIG_SCHEDSTATS
965
/* load_balance() stats */
966
unsigned int lb_count[CPU_MAX_IDLE_TYPES];
967
unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
968
unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
969
unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
970
unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
971
unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
972
unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
973
unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
975
/* Active load balancing */
976
unsigned int alb_count;
977
unsigned int alb_failed;
978
unsigned int alb_pushed;
980
/* SD_BALANCE_EXEC stats */
981
unsigned int sbe_count;
982
unsigned int sbe_balanced;
983
unsigned int sbe_pushed;
985
/* SD_BALANCE_FORK stats */
986
unsigned int sbf_count;
987
unsigned int sbf_balanced;
988
unsigned int sbf_pushed;
990
/* try_to_wake_up() stats */
991
unsigned int ttwu_wake_remote;
992
unsigned int ttwu_move_affine;
993
unsigned int ttwu_move_balance;
995
#ifdef CONFIG_SCHED_DEBUG
999
void *private; /* used during construction */
1000
struct rcu_head rcu; /* used during destruction */
1003
unsigned int span_weight;
1005
* Span of all CPUs in this domain.
1007
* NOTE: this field is variable length. (Allocated dynamically
1008
* by attaching extra space to the end of the structure,
1009
* depending on how many CPUs the kernel has booted up with)
1011
unsigned long span[0];
1014
static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
1016
return to_cpumask(sd->span);
1019
extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1020
struct sched_domain_attr *dattr_new);
1022
/* Allocate an array of sched domains, for partition_sched_domains(). */
1023
cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
1024
void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
1026
/* Test a flag in parent sched domain */
1027
static inline int test_sd_parent(struct sched_domain *sd, int flag)
1029
if (sd->parent && (sd->parent->flags & flag))
1035
unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
1036
unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
1038
#else /* CONFIG_SMP */
1040
struct sched_domain_attr;
1043
partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1044
struct sched_domain_attr *dattr_new)
1047
#endif /* !CONFIG_SMP */
1050
struct io_context; /* See blkdev.h */
1053
#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1054
extern void prefetch_stack(struct task_struct *t);
1056
static inline void prefetch_stack(struct task_struct *t) { }
1059
struct audit_context; /* See audit.c */
1061
struct pipe_inode_info;
1062
struct uts_namespace;
1065
struct sched_domain;
1070
#define WF_SYNC 0x01 /* waker goes to sleep after wakup */
1071
#define WF_FORK 0x02 /* child wakeup after fork */
1072
#define WF_MIGRATED 0x04 /* internal use, task got migrated */
1074
#define ENQUEUE_WAKEUP 1
1075
#define ENQUEUE_HEAD 2
1077
#define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */
1079
#define ENQUEUE_WAKING 0
1082
#define DEQUEUE_SLEEP 1
1084
struct sched_class {
1085
const struct sched_class *next;
1087
void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
1088
void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
1089
void (*yield_task) (struct rq *rq);
1090
bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt);
1092
void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
1094
struct task_struct * (*pick_next_task) (struct rq *rq);
1095
void (*put_prev_task) (struct rq *rq, struct task_struct *p);
1098
int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);
1100
void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1101
void (*post_schedule) (struct rq *this_rq);
1102
void (*task_waking) (struct task_struct *task);
1103
void (*task_woken) (struct rq *this_rq, struct task_struct *task);
1105
void (*set_cpus_allowed)(struct task_struct *p,
1106
const struct cpumask *newmask);
1108
void (*rq_online)(struct rq *rq);
1109
void (*rq_offline)(struct rq *rq);
1112
void (*set_curr_task) (struct rq *rq);
1113
void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1114
void (*task_fork) (struct task_struct *p);
1116
void (*switched_from) (struct rq *this_rq, struct task_struct *task);
1117
void (*switched_to) (struct rq *this_rq, struct task_struct *task);
1118
void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1121
unsigned int (*get_rr_interval) (struct rq *rq,
1122
struct task_struct *task);
1124
#ifdef CONFIG_FAIR_GROUP_SCHED
1125
void (*task_move_group) (struct task_struct *p, int on_rq);
1129
struct load_weight {
1130
unsigned long weight, inv_weight;
1133
#ifdef CONFIG_SCHEDSTATS
1134
struct sched_statistics {
1144
s64 sum_sleep_runtime;
1151
u64 nr_migrations_cold;
1152
u64 nr_failed_migrations_affine;
1153
u64 nr_failed_migrations_running;
1154
u64 nr_failed_migrations_hot;
1155
u64 nr_forced_migrations;
1158
u64 nr_wakeups_sync;
1159
u64 nr_wakeups_migrate;
1160
u64 nr_wakeups_local;
1161
u64 nr_wakeups_remote;
1162
u64 nr_wakeups_affine;
1163
u64 nr_wakeups_affine_attempts;
1164
u64 nr_wakeups_passive;
1165
u64 nr_wakeups_idle;
1169
struct sched_entity {
1170
struct load_weight load; /* for load-balancing */
1171
struct rb_node run_node;
1172
struct list_head group_node;
1176
u64 sum_exec_runtime;
1178
u64 prev_sum_exec_runtime;
1182
#ifdef CONFIG_SCHEDSTATS
1183
struct sched_statistics statistics;
1186
#ifdef CONFIG_FAIR_GROUP_SCHED
1187
struct sched_entity *parent;
1188
/* rq on which this entity is (to be) queued: */
1189
struct cfs_rq *cfs_rq;
1190
/* rq "owned" by this entity/group: */
1191
struct cfs_rq *my_q;
1195
struct sched_rt_entity {
1196
struct list_head run_list;
1197
unsigned long timeout;
1198
unsigned int time_slice;
1199
int nr_cpus_allowed;
1201
struct sched_rt_entity *back;
1202
#ifdef CONFIG_RT_GROUP_SCHED
1203
struct sched_rt_entity *parent;
1204
/* rq on which this entity is (to be) queued: */
1205
struct rt_rq *rt_rq;
1206
/* rq "owned" by this entity/group: */
1213
enum perf_event_task_context {
1214
perf_invalid_context = -1,
1215
perf_hw_context = 0,
1217
perf_nr_task_contexts,
1220
struct task_struct {
1221
volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1224
unsigned int flags; /* per process flags, defined below */
1225
unsigned int ptrace;
1228
struct llist_node wake_entry;
1233
int prio, static_prio, normal_prio;
1234
unsigned int rt_priority;
1235
const struct sched_class *sched_class;
1236
struct sched_entity se;
1237
struct sched_rt_entity rt;
1239
#ifdef CONFIG_PREEMPT_NOTIFIERS
1240
/* list of struct preempt_notifier: */
1241
struct hlist_head preempt_notifiers;
1245
* fpu_counter contains the number of consecutive context switches
1246
* that the FPU is used. If this is over a threshold, the lazy fpu
1247
* saving becomes unlazy to save the trap. This is an unsigned char
1248
* so that after 256 times the counter wraps and the behavior turns
1249
* lazy again; this to deal with bursty apps that only use FPU for
1252
unsigned char fpu_counter;
1253
#ifdef CONFIG_BLK_DEV_IO_TRACE
1254
unsigned int btrace_seq;
1257
unsigned int policy;
1258
cpumask_t cpus_allowed;
1260
#ifdef CONFIG_PREEMPT_RCU
1261
int rcu_read_lock_nesting;
1262
char rcu_read_unlock_special;
1263
struct list_head rcu_node_entry;
1264
#endif /* #ifdef CONFIG_PREEMPT_RCU */
1265
#ifdef CONFIG_TREE_PREEMPT_RCU
1266
struct rcu_node *rcu_blocked_node;
1267
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1268
#ifdef CONFIG_RCU_BOOST
1269
struct rt_mutex *rcu_boost_mutex;
1270
#endif /* #ifdef CONFIG_RCU_BOOST */
1272
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1273
struct sched_info sched_info;
1276
struct list_head tasks;
1278
struct plist_node pushable_tasks;
1281
struct mm_struct *mm, *active_mm;
1282
#ifdef CONFIG_COMPAT_BRK
1283
unsigned brk_randomized:1;
1285
#if defined(SPLIT_RSS_COUNTING)
1286
struct task_rss_stat rss_stat;
1290
int exit_code, exit_signal;
1291
int pdeath_signal; /* The signal sent when the parent dies */
1292
unsigned int jobctl; /* JOBCTL_*, siglock protected */
1294
unsigned int personality;
1295
unsigned did_exec:1;
1296
unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1298
unsigned in_iowait:1;
1301
/* Revert to default priority/policy when forking */
1302
unsigned sched_reset_on_fork:1;
1303
unsigned sched_contributes_to_load:1;
1308
#ifdef CONFIG_CC_STACKPROTECTOR
1309
/* Canary value for the -fstack-protector gcc feature */
1310
unsigned long stack_canary;
1314
* pointers to (original) parent process, youngest child, younger sibling,
1315
* older sibling, respectively. (p->father can be replaced with
1316
* p->real_parent->pid)
1318
struct task_struct *real_parent; /* real parent process */
1319
struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1321
* children/sibling forms the list of my natural children
1323
struct list_head children; /* list of my children */
1324
struct list_head sibling; /* linkage in my parent's children list */
1325
struct task_struct *group_leader; /* threadgroup leader */
1328
* ptraced is the list of tasks this task is using ptrace on.
1329
* This includes both natural children and PTRACE_ATTACH targets.
1330
* p->ptrace_entry is p's link on the p->parent->ptraced list.
1332
struct list_head ptraced;
1333
struct list_head ptrace_entry;
1335
/* PID/PID hash table linkage. */
1336
struct pid_link pids[PIDTYPE_MAX];
1337
struct list_head thread_group;
1339
struct completion *vfork_done; /* for vfork() */
1340
int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1341
int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1343
cputime_t utime, stime, utimescaled, stimescaled;
1345
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
1346
cputime_t prev_utime, prev_stime;
1348
unsigned long nvcsw, nivcsw; /* context switch counts */
1349
struct timespec start_time; /* monotonic time */
1350
struct timespec real_start_time; /* boot based time */
1351
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1352
unsigned long min_flt, maj_flt;
1354
struct task_cputime cputime_expires;
1355
struct list_head cpu_timers[3];
1357
/* process credentials */
1358
const struct cred __rcu *real_cred; /* objective and real subjective task
1359
* credentials (COW) */
1360
const struct cred __rcu *cred; /* effective (overridable) subjective task
1361
* credentials (COW) */
1362
struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
1364
char comm[TASK_COMM_LEN]; /* executable name excluding path
1365
- access with [gs]et_task_comm (which lock
1366
it with task_lock())
1367
- initialized normally by setup_new_exec */
1368
/* file system info */
1369
int link_count, total_link_count;
1370
#ifdef CONFIG_SYSVIPC
1372
struct sysv_sem sysvsem;
1374
#ifdef CONFIG_DETECT_HUNG_TASK
1375
/* hung task detection */
1376
unsigned long last_switch_count;
1378
/* CPU-specific state of this task */
1379
struct thread_struct thread;
1380
/* filesystem information */
1381
struct fs_struct *fs;
1382
/* open file information */
1383
struct files_struct *files;
1385
struct nsproxy *nsproxy;
1386
/* signal handlers */
1387
struct signal_struct *signal;
1388
struct sighand_struct *sighand;
1390
sigset_t blocked, real_blocked;
1391
sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1392
struct sigpending pending;
1394
unsigned long sas_ss_sp;
1396
int (*notifier)(void *priv);
1397
void *notifier_data;
1398
sigset_t *notifier_mask;
1399
struct audit_context *audit_context;
1400
#ifdef CONFIG_AUDITSYSCALL
1402
unsigned int sessionid;
1406
/* Thread group tracking */
1409
/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1411
spinlock_t alloc_lock;
1413
#ifdef CONFIG_GENERIC_HARDIRQS
1414
/* IRQ handler threads */
1415
struct irqaction *irqaction;
1418
/* Protection of the PI data structures: */
1419
raw_spinlock_t pi_lock;
1421
#ifdef CONFIG_RT_MUTEXES
1422
/* PI waiters blocked on a rt_mutex held by this task */
1423
struct plist_head pi_waiters;
1424
/* Deadlock detection and priority inheritance handling */
1425
struct rt_mutex_waiter *pi_blocked_on;
1428
#ifdef CONFIG_DEBUG_MUTEXES
1429
/* mutex deadlock detection */
1430
struct mutex_waiter *blocked_on;
1432
#ifdef CONFIG_TRACE_IRQFLAGS
1433
unsigned int irq_events;
1434
unsigned long hardirq_enable_ip;
1435
unsigned long hardirq_disable_ip;
1436
unsigned int hardirq_enable_event;
1437
unsigned int hardirq_disable_event;
1438
int hardirqs_enabled;
1439
int hardirq_context;
1440
unsigned long softirq_disable_ip;
1441
unsigned long softirq_enable_ip;
1442
unsigned int softirq_disable_event;
1443
unsigned int softirq_enable_event;
1444
int softirqs_enabled;
1445
int softirq_context;
1447
#ifdef CONFIG_LOCKDEP
1448
# define MAX_LOCK_DEPTH 48UL
1451
unsigned int lockdep_recursion;
1452
struct held_lock held_locks[MAX_LOCK_DEPTH];
1453
gfp_t lockdep_reclaim_gfp;
1456
/* journalling filesystem info */
1459
/* stacked block device info */
1460
struct bio_list *bio_list;
1463
/* stack plugging */
1464
struct blk_plug *plug;
1468
struct reclaim_state *reclaim_state;
1470
struct backing_dev_info *backing_dev_info;
1472
struct io_context *io_context;
1474
unsigned long ptrace_message;
1475
siginfo_t *last_siginfo; /* For ptrace use. */
1476
struct task_io_accounting ioac;
1477
#if defined(CONFIG_TASK_XACCT)
1478
u64 acct_rss_mem1; /* accumulated rss usage */
1479
u64 acct_vm_mem1; /* accumulated virtual memory usage */
1480
cputime_t acct_timexpd; /* stime + utime since last update */
1482
#ifdef CONFIG_CPUSETS
1483
nodemask_t mems_allowed; /* Protected by alloc_lock */
1484
int mems_allowed_change_disable;
1485
int cpuset_mem_spread_rotor;
1486
int cpuset_slab_spread_rotor;
1488
#ifdef CONFIG_CGROUPS
1489
/* Control Group info protected by css_set_lock */
1490
struct css_set __rcu *cgroups;
1491
/* cg_list protected by css_set_lock and tsk->alloc_lock */
1492
struct list_head cg_list;
1495
struct robust_list_head __user *robust_list;
1496
#ifdef CONFIG_COMPAT
1497
struct compat_robust_list_head __user *compat_robust_list;
1499
struct list_head pi_state_list;
1500
struct futex_pi_state *pi_state_cache;
1502
#ifdef CONFIG_PERF_EVENTS
1503
struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1504
struct mutex perf_event_mutex;
1505
struct list_head perf_event_list;
1508
struct mempolicy *mempolicy; /* Protected by alloc_lock */
1510
short pref_node_fork;
1512
struct rcu_head rcu;
1515
* cache last used pipe for splice
1517
struct pipe_inode_info *splice_pipe;
1518
#ifdef CONFIG_TASK_DELAY_ACCT
1519
struct task_delay_info *delays;
1521
#ifdef CONFIG_FAULT_INJECTION
1525
* when (nr_dirtied >= nr_dirtied_pause), it's time to call
1526
* balance_dirty_pages() for some dirty throttling pause
1529
int nr_dirtied_pause;
1531
#ifdef CONFIG_LATENCYTOP
1532
int latency_record_count;
1533
struct latency_record latency_record[LT_SAVECOUNT];
1536
* time slack values; these are used to round up poll() and
1537
* select() etc timeout values. These are in nanoseconds.
1539
unsigned long timer_slack_ns;
1540
unsigned long default_timer_slack_ns;
1542
struct list_head *scm_work_list;
1543
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1544
/* Index of current stored address in ret_stack */
1546
/* Stack of return addresses for return function tracing */
1547
struct ftrace_ret_stack *ret_stack;
1548
/* time stamp for last schedule */
1549
unsigned long long ftrace_timestamp;
1551
* Number of functions that haven't been traced
1552
* because of depth overrun.
1554
atomic_t trace_overrun;
1555
/* Pause for the tracing */
1556
atomic_t tracing_graph_pause;
1558
#ifdef CONFIG_TRACING
1559
/* state flags for use by tracers */
1560
unsigned long trace;
1561
/* bitmask and counter of trace recursion */
1562
unsigned long trace_recursion;
1563
#endif /* CONFIG_TRACING */
1564
#ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
1565
struct memcg_batch_info {
1566
int do_batch; /* incremented when batch uncharge started */
1567
struct mem_cgroup *memcg; /* target memcg of uncharge */
1568
unsigned long nr_pages; /* uncharged usage */
1569
unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
1572
#ifdef CONFIG_HAVE_HW_BREAKPOINT
1573
atomic_t ptrace_bp_refcnt;
1577
/* Future-safe accessor for struct task_struct's cpus_allowed. */
1578
#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1581
* Priority of a process goes from 0..MAX_PRIO-1, valid RT
1582
* priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1583
* tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1584
* values are inverted: lower p->prio value means higher priority.
1586
* The MAX_USER_RT_PRIO value allows the actual maximum
1587
* RT priority to be separate from the value exported to
1588
* user-space. This allows kernel threads to set their
1589
* priority to a value higher than any user task. Note:
1590
* MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1593
#define MAX_USER_RT_PRIO 100
1594
#define MAX_RT_PRIO MAX_USER_RT_PRIO
1596
#define MAX_PRIO (MAX_RT_PRIO + 40)
1597
#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1599
static inline int rt_prio(int prio)
1601
if (unlikely(prio < MAX_RT_PRIO))
1606
static inline int rt_task(struct task_struct *p)
1608
return rt_prio(p->prio);
1611
static inline struct pid *task_pid(struct task_struct *task)
1613
return task->pids[PIDTYPE_PID].pid;
1616
static inline struct pid *task_tgid(struct task_struct *task)
1618
return task->group_leader->pids[PIDTYPE_PID].pid;
1622
* Without tasklist or rcu lock it is not safe to dereference
1623
* the result of task_pgrp/task_session even if task == current,
1624
* we can race with another thread doing sys_setsid/sys_setpgid.
1626
static inline struct pid *task_pgrp(struct task_struct *task)
1628
return task->group_leader->pids[PIDTYPE_PGID].pid;
1631
static inline struct pid *task_session(struct task_struct *task)
1633
return task->group_leader->pids[PIDTYPE_SID].pid;
1636
struct pid_namespace;
1639
* the helpers to get the task's different pids as they are seen
1640
* from various namespaces
1642
* task_xid_nr() : global id, i.e. the id seen from the init namespace;
1643
* task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1645
* task_xid_nr_ns() : id seen from the ns specified;
1647
* set_task_vxid() : assigns a virtual id to a task;
1649
* see also pid_nr() etc in include/linux/pid.h
1651
pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1652
struct pid_namespace *ns);
1654
static inline pid_t task_pid_nr(struct task_struct *tsk)
1659
static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1660
struct pid_namespace *ns)
1662
return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1665
static inline pid_t task_pid_vnr(struct task_struct *tsk)
1667
return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1671
static inline pid_t task_tgid_nr(struct task_struct *tsk)
1676
pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1678
static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1680
return pid_vnr(task_tgid(tsk));
1684
static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1685
struct pid_namespace *ns)
1687
return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1690
static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1692
return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1696
static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1697
struct pid_namespace *ns)
1699
return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1702
static inline pid_t task_session_vnr(struct task_struct *tsk)
1704
return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1707
/* obsolete, do not use */
1708
static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1710
return task_pgrp_nr_ns(tsk, &init_pid_ns);
1714
* pid_alive - check that a task structure is not stale
1715
* @p: Task structure to be checked.
1717
* Test if a process is not yet dead (at most zombie state)
1718
* If pid_alive fails, then pointers within the task structure
1719
* can be stale and must not be dereferenced.
1721
static inline int pid_alive(struct task_struct *p)
1723
return p->pids[PIDTYPE_PID].pid != NULL;
1727
* is_global_init - check if a task structure is init
1728
* @tsk: Task structure to be checked.
1730
* Check if a task structure is the first user space task the kernel created.
1732
static inline int is_global_init(struct task_struct *tsk)
1734
return tsk->pid == 1;
1738
* is_container_init:
1739
* check whether in the task is init in its own pid namespace.
1741
extern int is_container_init(struct task_struct *tsk);
1743
extern struct pid *cad_pid;
1745
extern void free_task(struct task_struct *tsk);
1746
#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1748
extern void __put_task_struct(struct task_struct *t);
1750
static inline void put_task_struct(struct task_struct *t)
1752
if (atomic_dec_and_test(&t->usage))
1753
__put_task_struct(t);
1756
extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1757
extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1762
#define PF_STARTING 0x00000002 /* being created */
1763
#define PF_EXITING 0x00000004 /* getting shut down */
1764
#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1765
#define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1766
#define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1767
#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1768
#define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1769
#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1770
#define PF_DUMPCORE 0x00000200 /* dumped core */
1771
#define PF_SIGNALED 0x00000400 /* killed by a signal */
1772
#define PF_MEMALLOC 0x00000800 /* Allocating memory */
1773
#define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1774
#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1775
#define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */
1776
#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1777
#define PF_FROZEN 0x00010000 /* frozen for system suspend */
1778
#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1779
#define PF_KSWAPD 0x00040000 /* I am kswapd */
1780
#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1781
#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1782
#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1783
#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1784
#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1785
#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1786
#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1787
#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1788
#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1789
#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1790
#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1791
#define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1794
* Only the _current_ task can read/write to tsk->flags, but other
1795
* tasks can access tsk->flags in readonly mode for example
1796
* with tsk_used_math (like during threaded core dumping).
1797
* There is however an exception to this rule during ptrace
1798
* or during fork: the ptracer task is allowed to write to the
1799
* child->flags of its traced child (same goes for fork, the parent
1800
* can write to the child->flags), because we're guaranteed the
1801
* child is not running and in turn not changing child->flags
1802
* at the same time the parent does it.
1804
#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1805
#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1806
#define clear_used_math() clear_stopped_child_used_math(current)
1807
#define set_used_math() set_stopped_child_used_math(current)
1808
#define conditional_stopped_child_used_math(condition, child) \
1809
do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1810
#define conditional_used_math(condition) \
1811
conditional_stopped_child_used_math(condition, current)
1812
#define copy_to_stopped_child_used_math(child) \
1813
do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1814
/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1815
#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1816
#define used_math() tsk_used_math(current)
1819
* task->jobctl flags
1821
#define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1823
#define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1824
#define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1825
#define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1826
#define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1827
#define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1828
#define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1829
#define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1831
#define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1832
#define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
1833
#define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
1834
#define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
1835
#define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
1836
#define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
1837
#define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
1839
#define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1840
#define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
1842
extern bool task_set_jobctl_pending(struct task_struct *task,
1844
extern void task_clear_jobctl_trapping(struct task_struct *task);
1845
extern void task_clear_jobctl_pending(struct task_struct *task,
1848
#ifdef CONFIG_PREEMPT_RCU
1850
#define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1851
#define RCU_READ_UNLOCK_BOOSTED (1 << 1) /* boosted while in RCU read-side. */
1852
#define RCU_READ_UNLOCK_NEED_QS (1 << 2) /* RCU core needs CPU response. */
1854
static inline void rcu_copy_process(struct task_struct *p)
1856
p->rcu_read_lock_nesting = 0;
1857
p->rcu_read_unlock_special = 0;
1858
#ifdef CONFIG_TREE_PREEMPT_RCU
1859
p->rcu_blocked_node = NULL;
1860
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1861
#ifdef CONFIG_RCU_BOOST
1862
p->rcu_boost_mutex = NULL;
1863
#endif /* #ifdef CONFIG_RCU_BOOST */
1864
INIT_LIST_HEAD(&p->rcu_node_entry);
1869
static inline void rcu_copy_process(struct task_struct *p)
1876
extern void do_set_cpus_allowed(struct task_struct *p,
1877
const struct cpumask *new_mask);
1879
extern int set_cpus_allowed_ptr(struct task_struct *p,
1880
const struct cpumask *new_mask);
1882
static inline void do_set_cpus_allowed(struct task_struct *p,
1883
const struct cpumask *new_mask)
1886
static inline int set_cpus_allowed_ptr(struct task_struct *p,
1887
const struct cpumask *new_mask)
1889
if (!cpumask_test_cpu(0, new_mask))
1895
#ifndef CONFIG_CPUMASK_OFFSTACK
1896
static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1898
return set_cpus_allowed_ptr(p, &new_mask);
1903
* Do not use outside of architecture code which knows its limitations.
1905
* sched_clock() has no promise of monotonicity or bounded drift between
1906
* CPUs, use (which you should not) requires disabling IRQs.
1908
* Please use one of the three interfaces below.
1910
extern unsigned long long notrace sched_clock(void);
1912
* See the comment in kernel/sched_clock.c
1914
extern u64 cpu_clock(int cpu);
1915
extern u64 local_clock(void);
1916
extern u64 sched_clock_cpu(int cpu);
1919
extern void sched_clock_init(void);
1921
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1922
static inline void sched_clock_tick(void)
1926
static inline void sched_clock_idle_sleep_event(void)
1930
static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1935
* Architectures can set this to 1 if they have specified
1936
* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1937
* but then during bootup it turns out that sched_clock()
1938
* is reliable after all:
1940
extern int sched_clock_stable;
1942
extern void sched_clock_tick(void);
1943
extern void sched_clock_idle_sleep_event(void);
1944
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1947
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
1949
* An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1950
* The reason for this explicit opt-in is not to have perf penalty with
1951
* slow sched_clocks.
1953
extern void enable_sched_clock_irqtime(void);
1954
extern void disable_sched_clock_irqtime(void);
1956
static inline void enable_sched_clock_irqtime(void) {}
1957
static inline void disable_sched_clock_irqtime(void) {}
1960
extern unsigned long long
1961
task_sched_runtime(struct task_struct *task);
1963
/* sched_exec is called by processes performing an exec */
1965
extern void sched_exec(void);
1967
#define sched_exec() {}
1970
extern void sched_clock_idle_sleep_event(void);
1971
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1973
#ifdef CONFIG_HOTPLUG_CPU
1974
extern void idle_task_exit(void);
1976
static inline void idle_task_exit(void) {}
1979
#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1980
extern void wake_up_idle_cpu(int cpu);
1982
static inline void wake_up_idle_cpu(int cpu) { }
1985
extern unsigned int sysctl_sched_latency;
1986
extern unsigned int sysctl_sched_min_granularity;
1987
extern unsigned int sysctl_sched_wakeup_granularity;
1988
extern unsigned int sysctl_sched_child_runs_first;
1990
enum sched_tunable_scaling {
1991
SCHED_TUNABLESCALING_NONE,
1992
SCHED_TUNABLESCALING_LOG,
1993
SCHED_TUNABLESCALING_LINEAR,
1994
SCHED_TUNABLESCALING_END,
1996
extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
1998
#ifdef CONFIG_SCHED_DEBUG
1999
extern unsigned int sysctl_sched_migration_cost;
2000
extern unsigned int sysctl_sched_nr_migrate;
2001
extern unsigned int sysctl_sched_time_avg;
2002
extern unsigned int sysctl_timer_migration;
2003
extern unsigned int sysctl_sched_shares_window;
2005
int sched_proc_update_handler(struct ctl_table *table, int write,
2006
void __user *buffer, size_t *length,
2009
#ifdef CONFIG_SCHED_DEBUG
2010
static inline unsigned int get_sysctl_timer_migration(void)
2012
return sysctl_timer_migration;
2015
static inline unsigned int get_sysctl_timer_migration(void)
2020
extern unsigned int sysctl_sched_rt_period;
2021
extern int sysctl_sched_rt_runtime;
2023
int sched_rt_handler(struct ctl_table *table, int write,
2024
void __user *buffer, size_t *lenp,
2027
#ifdef CONFIG_SCHED_AUTOGROUP
2028
extern unsigned int sysctl_sched_autogroup_enabled;
2030
extern void sched_autogroup_create_attach(struct task_struct *p);
2031
extern void sched_autogroup_detach(struct task_struct *p);
2032
extern void sched_autogroup_fork(struct signal_struct *sig);
2033
extern void sched_autogroup_exit(struct signal_struct *sig);
2034
#ifdef CONFIG_PROC_FS
2035
extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
2036
extern int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice);
2039
static inline void sched_autogroup_create_attach(struct task_struct *p) { }
2040
static inline void sched_autogroup_detach(struct task_struct *p) { }
2041
static inline void sched_autogroup_fork(struct signal_struct *sig) { }
2042
static inline void sched_autogroup_exit(struct signal_struct *sig) { }
2045
#ifdef CONFIG_CFS_BANDWIDTH
2046
extern unsigned int sysctl_sched_cfs_bandwidth_slice;
2049
#ifdef CONFIG_RT_MUTEXES
2050
extern int rt_mutex_getprio(struct task_struct *p);
2051
extern void rt_mutex_setprio(struct task_struct *p, int prio);
2052
extern void rt_mutex_adjust_pi(struct task_struct *p);
2054
static inline int rt_mutex_getprio(struct task_struct *p)
2056
return p->normal_prio;
2058
# define rt_mutex_adjust_pi(p) do { } while (0)
2061
extern bool yield_to(struct task_struct *p, bool preempt);
2062
extern void set_user_nice(struct task_struct *p, long nice);
2063
extern int task_prio(const struct task_struct *p);
2064
extern int task_nice(const struct task_struct *p);
2065
extern int can_nice(const struct task_struct *p, const int nice);
2066
extern int task_curr(const struct task_struct *p);
2067
extern int idle_cpu(int cpu);
2068
extern int sched_setscheduler(struct task_struct *, int,
2069
const struct sched_param *);
2070
extern int sched_setscheduler_nocheck(struct task_struct *, int,
2071
const struct sched_param *);
2072
extern struct task_struct *idle_task(int cpu);
2073
extern struct task_struct *curr_task(int cpu);
2074
extern void set_curr_task(int cpu, struct task_struct *p);
2079
* The default (Linux) execution domain.
2081
extern struct exec_domain default_exec_domain;
2083
union thread_union {
2084
struct thread_info thread_info;
2085
unsigned long stack[THREAD_SIZE/sizeof(long)];
2088
#ifndef __HAVE_ARCH_KSTACK_END
2089
static inline int kstack_end(void *addr)
2091
/* Reliable end of stack detection:
2092
* Some APM bios versions misalign the stack
2094
return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
2098
extern union thread_union init_thread_union;
2099
extern struct task_struct init_task;
2101
extern struct mm_struct init_mm;
2103
extern struct pid_namespace init_pid_ns;
2106
* find a task by one of its numerical ids
2108
* find_task_by_pid_ns():
2109
* finds a task by its pid in the specified namespace
2110
* find_task_by_vpid():
2111
* finds a task by its virtual pid
2113
* see also find_vpid() etc in include/linux/pid.h
2116
extern struct task_struct *find_task_by_vpid(pid_t nr);
2117
extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2118
struct pid_namespace *ns);
2120
extern void __set_special_pids(struct pid *pid);
2122
/* per-UID process charging. */
2123
extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
2124
static inline struct user_struct *get_uid(struct user_struct *u)
2126
atomic_inc(&u->__count);
2129
extern void free_uid(struct user_struct *);
2130
extern void release_uids(struct user_namespace *ns);
2132
#include <asm/current.h>
2134
extern void xtime_update(unsigned long ticks);
2136
extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2137
extern int wake_up_process(struct task_struct *tsk);
2138
extern void wake_up_new_task(struct task_struct *tsk);
2140
extern void kick_process(struct task_struct *tsk);
2142
static inline void kick_process(struct task_struct *tsk) { }
2144
extern void sched_fork(struct task_struct *p);
2145
extern void sched_dead(struct task_struct *p);
2147
extern void proc_caches_init(void);
2148
extern void flush_signals(struct task_struct *);
2149
extern void __flush_signals(struct task_struct *);
2150
extern void ignore_signals(struct task_struct *);
2151
extern void flush_signal_handlers(struct task_struct *, int force_default);
2152
extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2154
static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2156
unsigned long flags;
2159
spin_lock_irqsave(&tsk->sighand->siglock, flags);
2160
ret = dequeue_signal(tsk, mask, info);
2161
spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2166
extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2168
extern void unblock_all_signals(void);
2169
extern void release_task(struct task_struct * p);
2170
extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2171
extern int force_sigsegv(int, struct task_struct *);
2172
extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2173
extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2174
extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2175
extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
2176
const struct cred *, u32);
2177
extern int kill_pgrp(struct pid *pid, int sig, int priv);
2178
extern int kill_pid(struct pid *pid, int sig, int priv);
2179
extern int kill_proc_info(int, struct siginfo *, pid_t);
2180
extern __must_check bool do_notify_parent(struct task_struct *, int);
2181
extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2182
extern void force_sig(int, struct task_struct *);
2183
extern int send_sig(int, struct task_struct *, int);
2184
extern int zap_other_threads(struct task_struct *p);
2185
extern struct sigqueue *sigqueue_alloc(void);
2186
extern void sigqueue_free(struct sigqueue *);
2187
extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
2188
extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2189
extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
2191
static inline int kill_cad_pid(int sig, int priv)
2193
return kill_pid(cad_pid, sig, priv);
2196
/* These can be the second arg to send_sig_info/send_group_sig_info. */
2197
#define SEND_SIG_NOINFO ((struct siginfo *) 0)
2198
#define SEND_SIG_PRIV ((struct siginfo *) 1)
2199
#define SEND_SIG_FORCED ((struct siginfo *) 2)
2202
* True if we are on the alternate signal stack.
2204
static inline int on_sig_stack(unsigned long sp)
2206
#ifdef CONFIG_STACK_GROWSUP
2207
return sp >= current->sas_ss_sp &&
2208
sp - current->sas_ss_sp < current->sas_ss_size;
2210
return sp > current->sas_ss_sp &&
2211
sp - current->sas_ss_sp <= current->sas_ss_size;
2215
static inline int sas_ss_flags(unsigned long sp)
2217
return (current->sas_ss_size == 0 ? SS_DISABLE
2218
: on_sig_stack(sp) ? SS_ONSTACK : 0);
2222
* Routines for handling mm_structs
2224
extern struct mm_struct * mm_alloc(void);
2226
/* mmdrop drops the mm and the page tables */
2227
extern void __mmdrop(struct mm_struct *);
2228
static inline void mmdrop(struct mm_struct * mm)
2230
if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2234
/* mmput gets rid of the mappings and all user-space */
2235
extern void mmput(struct mm_struct *);
2236
/* Grab a reference to a task's mm, if it is not already going away */
2237
extern struct mm_struct *get_task_mm(struct task_struct *task);
2238
/* Remove the current tasks stale references to the old mm_struct */
2239
extern void mm_release(struct task_struct *, struct mm_struct *);
2240
/* Allocate a new mm structure and copy contents from tsk->mm */
2241
extern struct mm_struct *dup_mm(struct task_struct *tsk);
2243
extern int copy_thread(unsigned long, unsigned long, unsigned long,
2244
struct task_struct *, struct pt_regs *);
2245
extern void flush_thread(void);
2246
extern void exit_thread(void);
2248
extern void exit_files(struct task_struct *);
2249
extern void __cleanup_sighand(struct sighand_struct *);
2251
extern void exit_itimers(struct signal_struct *);
2252
extern void flush_itimer_signals(void);
2254
extern NORET_TYPE void do_group_exit(int);
2256
extern void daemonize(const char *, ...);
2257
extern int allow_signal(int);
2258
extern int disallow_signal(int);
2260
extern int do_execve(const char *,
2261
const char __user * const __user *,
2262
const char __user * const __user *, struct pt_regs *);
2263
extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
2264
struct task_struct *fork_idle(int);
2266
extern void set_task_comm(struct task_struct *tsk, char *from);
2267
extern char *get_task_comm(char *to, struct task_struct *tsk);
2270
void scheduler_ipi(void);
2271
extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2273
static inline void scheduler_ipi(void) { }
2274
static inline unsigned long wait_task_inactive(struct task_struct *p,
2281
#define next_task(p) \
2282
list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2284
#define for_each_process(p) \
2285
for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2287
extern bool current_is_single_threaded(void);
2290
* Careful: do_each_thread/while_each_thread is a double loop so
2291
* 'break' will not work as expected - use goto instead.
2293
#define do_each_thread(g, t) \
2294
for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2296
#define while_each_thread(g, t) \
2297
while ((t = next_thread(t)) != g)
2299
static inline int get_nr_threads(struct task_struct *tsk)
2301
return tsk->signal->nr_threads;
2304
static inline bool thread_group_leader(struct task_struct *p)
2306
return p->exit_signal >= 0;
2309
/* Do to the insanities of de_thread it is possible for a process
2310
* to have the pid of the thread group leader without actually being
2311
* the thread group leader. For iteration through the pids in proc
2312
* all we care about is that we have a task with the appropriate
2313
* pid, we don't actually care if we have the right task.
2315
static inline int has_group_leader_pid(struct task_struct *p)
2317
return p->pid == p->tgid;
2321
int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2323
return p1->tgid == p2->tgid;
2326
static inline struct task_struct *next_thread(const struct task_struct *p)
2328
return list_entry_rcu(p->thread_group.next,
2329
struct task_struct, thread_group);
2332
static inline int thread_group_empty(struct task_struct *p)
2334
return list_empty(&p->thread_group);
2337
#define delay_group_leader(p) \
2338
(thread_group_leader(p) && !thread_group_empty(p))
2341
* Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2342
* subscriptions and synchronises with wait4(). Also used in procfs. Also
2343
* pins the final release of task.io_context. Also protects ->cpuset and
2344
* ->cgroup.subsys[].
2346
* Nests both inside and outside of read_lock(&tasklist_lock).
2347
* It must not be nested with write_lock_irq(&tasklist_lock),
2348
* neither inside nor outside.
2350
static inline void task_lock(struct task_struct *p)
2352
spin_lock(&p->alloc_lock);
2355
static inline void task_unlock(struct task_struct *p)
2357
spin_unlock(&p->alloc_lock);
2360
extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2361
unsigned long *flags);
2363
#define lock_task_sighand(tsk, flags) \
2364
({ struct sighand_struct *__ss; \
2365
__cond_lock(&(tsk)->sighand->siglock, \
2366
(__ss = __lock_task_sighand(tsk, flags))); \
2370
static inline void unlock_task_sighand(struct task_struct *tsk,
2371
unsigned long *flags)
2373
spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2376
/* See the declaration of threadgroup_fork_lock in signal_struct. */
2377
#ifdef CONFIG_CGROUPS
2378
static inline void threadgroup_fork_read_lock(struct task_struct *tsk)
2380
down_read(&tsk->signal->threadgroup_fork_lock);
2382
static inline void threadgroup_fork_read_unlock(struct task_struct *tsk)
2384
up_read(&tsk->signal->threadgroup_fork_lock);
2386
static inline void threadgroup_fork_write_lock(struct task_struct *tsk)
2388
down_write(&tsk->signal->threadgroup_fork_lock);
2390
static inline void threadgroup_fork_write_unlock(struct task_struct *tsk)
2392
up_write(&tsk->signal->threadgroup_fork_lock);
2395
static inline void threadgroup_fork_read_lock(struct task_struct *tsk) {}
2396
static inline void threadgroup_fork_read_unlock(struct task_struct *tsk) {}
2397
static inline void threadgroup_fork_write_lock(struct task_struct *tsk) {}
2398
static inline void threadgroup_fork_write_unlock(struct task_struct *tsk) {}
2401
#ifndef __HAVE_THREAD_FUNCTIONS
2403
#define task_thread_info(task) ((struct thread_info *)(task)->stack)
2404
#define task_stack_page(task) ((task)->stack)
2406
static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2408
*task_thread_info(p) = *task_thread_info(org);
2409
task_thread_info(p)->task = p;
2412
static inline unsigned long *end_of_stack(struct task_struct *p)
2414
return (unsigned long *)(task_thread_info(p) + 1);
2419
static inline int object_is_on_stack(void *obj)
2421
void *stack = task_stack_page(current);
2423
return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2426
extern void thread_info_cache_init(void);
2428
#ifdef CONFIG_DEBUG_STACK_USAGE
2429
static inline unsigned long stack_not_used(struct task_struct *p)
2431
unsigned long *n = end_of_stack(p);
2433
do { /* Skip over canary */
2437
return (unsigned long)n - (unsigned long)end_of_stack(p);
2441
/* set thread flags in other task's structures
2442
* - see asm/thread_info.h for TIF_xxxx flags available
2444
static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2446
set_ti_thread_flag(task_thread_info(tsk), flag);
2449
static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2451
clear_ti_thread_flag(task_thread_info(tsk), flag);
2454
static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2456
return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2459
static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2461
return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2464
static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2466
return test_ti_thread_flag(task_thread_info(tsk), flag);
2469
static inline void set_tsk_need_resched(struct task_struct *tsk)
2471
set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2474
static inline void clear_tsk_need_resched(struct task_struct *tsk)
2476
clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2479
static inline int test_tsk_need_resched(struct task_struct *tsk)
2481
return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2484
static inline int restart_syscall(void)
2486
set_tsk_thread_flag(current, TIF_SIGPENDING);
2487
return -ERESTARTNOINTR;
2490
static inline int signal_pending(struct task_struct *p)
2492
return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2495
static inline int __fatal_signal_pending(struct task_struct *p)
2497
return unlikely(sigismember(&p->pending.signal, SIGKILL));
2500
static inline int fatal_signal_pending(struct task_struct *p)
2502
return signal_pending(p) && __fatal_signal_pending(p);
2505
static inline int signal_pending_state(long state, struct task_struct *p)
2507
if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2509
if (!signal_pending(p))
2512
return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2515
static inline int need_resched(void)
2517
return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2521
* cond_resched() and cond_resched_lock(): latency reduction via
2522
* explicit rescheduling in places that are safe. The return
2523
* value indicates whether a reschedule was done in fact.
2524
* cond_resched_lock() will drop the spinlock before scheduling,
2525
* cond_resched_softirq() will enable bhs before scheduling.
2527
extern int _cond_resched(void);
2529
#define cond_resched() ({ \
2530
__might_sleep(__FILE__, __LINE__, 0); \
2534
extern int __cond_resched_lock(spinlock_t *lock);
2536
#ifdef CONFIG_PREEMPT_COUNT
2537
#define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2539
#define PREEMPT_LOCK_OFFSET 0
2542
#define cond_resched_lock(lock) ({ \
2543
__might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2544
__cond_resched_lock(lock); \
2547
extern int __cond_resched_softirq(void);
2549
#define cond_resched_softirq() ({ \
2550
__might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2551
__cond_resched_softirq(); \
2555
* Does a critical section need to be broken due to another
2556
* task waiting?: (technically does not depend on CONFIG_PREEMPT,
2557
* but a general need for low latency)
2559
static inline int spin_needbreak(spinlock_t *lock)
2561
#ifdef CONFIG_PREEMPT
2562
return spin_is_contended(lock);
2569
* Thread group CPU time accounting.
2571
void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2572
void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2574
static inline void thread_group_cputime_init(struct signal_struct *sig)
2576
raw_spin_lock_init(&sig->cputimer.lock);
2580
* Reevaluate whether the task has signals pending delivery.
2581
* Wake the task if so.
2582
* This is required every time the blocked sigset_t changes.
2583
* callers must hold sighand->siglock.
2585
extern void recalc_sigpending_and_wake(struct task_struct *t);
2586
extern void recalc_sigpending(void);
2588
extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2591
* Wrappers for p->thread_info->cpu access. No-op on UP.
2595
static inline unsigned int task_cpu(const struct task_struct *p)
2597
return task_thread_info(p)->cpu;
2600
extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2604
static inline unsigned int task_cpu(const struct task_struct *p)
2609
static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2613
#endif /* CONFIG_SMP */
2615
extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2616
extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2618
extern void normalize_rt_tasks(void);
2620
#ifdef CONFIG_CGROUP_SCHED
2622
extern struct task_group root_task_group;
2624
extern struct task_group *sched_create_group(struct task_group *parent);
2625
extern void sched_destroy_group(struct task_group *tg);
2626
extern void sched_move_task(struct task_struct *tsk);
2627
#ifdef CONFIG_FAIR_GROUP_SCHED
2628
extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2629
extern unsigned long sched_group_shares(struct task_group *tg);
2631
#ifdef CONFIG_RT_GROUP_SCHED
2632
extern int sched_group_set_rt_runtime(struct task_group *tg,
2633
long rt_runtime_us);
2634
extern long sched_group_rt_runtime(struct task_group *tg);
2635
extern int sched_group_set_rt_period(struct task_group *tg,
2637
extern long sched_group_rt_period(struct task_group *tg);
2638
extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2642
extern int task_can_switch_user(struct user_struct *up,
2643
struct task_struct *tsk);
2645
#ifdef CONFIG_TASK_XACCT
2646
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2648
tsk->ioac.rchar += amt;
2651
static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2653
tsk->ioac.wchar += amt;
2656
static inline void inc_syscr(struct task_struct *tsk)
2661
static inline void inc_syscw(struct task_struct *tsk)
2666
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2670
static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2674
static inline void inc_syscr(struct task_struct *tsk)
2678
static inline void inc_syscw(struct task_struct *tsk)
2683
#ifndef TASK_SIZE_OF
2684
#define TASK_SIZE_OF(tsk) TASK_SIZE
2687
#ifdef CONFIG_MM_OWNER
2688
extern void mm_update_next_owner(struct mm_struct *mm);
2689
extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2691
static inline void mm_update_next_owner(struct mm_struct *mm)
2695
static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2698
#endif /* CONFIG_MM_OWNER */
2700
static inline unsigned long task_rlimit(const struct task_struct *tsk,
2703
return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2706
static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2709
return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2712
static inline unsigned long rlimit(unsigned int limit)
2714
return task_rlimit(current, limit);
2717
static inline unsigned long rlimit_max(unsigned int limit)
2719
return task_rlimit_max(current, limit);
2722
#endif /* __KERNEL__ */