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>
67 #include <asm/ptrace.h>
68 #include <asm/cputime.h>
70 #include <linux/smp.h>
71 #include <linux/sem.h>
72 #include <linux/signal.h>
73 #include <linux/compiler.h>
74 #include <linux/completion.h>
75 #include <linux/pid.h>
76 #include <linux/percpu.h>
77 #include <linux/topology.h>
78 #include <linux/proportions.h>
79 #include <linux/seccomp.h>
80 #include <linux/rcupdate.h>
81 #include <linux/rculist.h>
82 #include <linux/rtmutex.h>
84 #include <linux/time.h>
85 #include <linux/param.h>
86 #include <linux/resource.h>
87 #include <linux/timer.h>
88 #include <linux/hrtimer.h>
89 #include <linux/task_io_accounting.h>
90 #include <linux/latencytop.h>
91 #include <linux/cred.h>
92 #include <linux/llist.h>
93 #include <linux/uidgid.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
);
148 extern void update_cpu_load_nohz(void);
150 extern unsigned long get_parent_ip(unsigned long addr
);
155 #ifdef CONFIG_SCHED_DEBUG
156 extern void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
);
157 extern void proc_sched_set_task(struct task_struct
*p
);
159 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
);
162 proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
165 static inline void proc_sched_set_task(struct task_struct
*p
)
169 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
175 * Task state bitmask. NOTE! These bits are also
176 * encoded in fs/proc/array.c: get_task_state().
178 * We have two separate sets of flags: task->state
179 * is about runnability, while task->exit_state are
180 * about the task exiting. Confusing, but this way
181 * modifying one set can't modify the other one by
184 #define TASK_RUNNING 0
185 #define TASK_INTERRUPTIBLE 1
186 #define TASK_UNINTERRUPTIBLE 2
187 #define __TASK_STOPPED 4
188 #define __TASK_TRACED 8
189 /* in tsk->exit_state */
190 #define EXIT_ZOMBIE 16
192 /* in tsk->state again */
194 #define TASK_WAKEKILL 128
195 #define TASK_WAKING 256
196 #define TASK_STATE_MAX 512
198 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
200 extern char ___assert_task_state
[1 - 2*!!(
201 sizeof(TASK_STATE_TO_CHAR_STR
)-1 != ilog2(TASK_STATE_MAX
)+1)];
203 /* Convenience macros for the sake of set_task_state */
204 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
205 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
206 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
208 /* Convenience macros for the sake of wake_up */
209 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
210 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
212 /* get_task_state() */
213 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
214 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
217 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
218 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
219 #define task_is_dead(task) ((task)->exit_state != 0)
220 #define task_is_stopped_or_traced(task) \
221 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
222 #define task_contributes_to_load(task) \
223 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
224 (task->flags & PF_FROZEN) == 0)
226 #define __set_task_state(tsk, state_value) \
227 do { (tsk)->state = (state_value); } while (0)
228 #define set_task_state(tsk, state_value) \
229 set_mb((tsk)->state, (state_value))
232 * set_current_state() includes a barrier so that the write of current->state
233 * is correctly serialised wrt the caller's subsequent test of whether to
236 * set_current_state(TASK_UNINTERRUPTIBLE);
237 * if (do_i_need_to_sleep())
240 * If the caller does not need such serialisation then use __set_current_state()
242 #define __set_current_state(state_value) \
243 do { current->state = (state_value); } while (0)
244 #define set_current_state(state_value) \
245 set_mb(current->state, (state_value))
247 /* Task command name length */
248 #define TASK_COMM_LEN 16
250 #include <linux/spinlock.h>
253 * This serializes "schedule()" and also protects
254 * the run-queue from deletions/modifications (but
255 * _adding_ to the beginning of the run-queue has
258 extern rwlock_t tasklist_lock
;
259 extern spinlock_t mmlist_lock
;
263 #ifdef CONFIG_PROVE_RCU
264 extern int lockdep_tasklist_lock_is_held(void);
265 #endif /* #ifdef CONFIG_PROVE_RCU */
267 extern void sched_init(void);
268 extern void sched_init_smp(void);
269 extern asmlinkage
void schedule_tail(struct task_struct
*prev
);
270 extern void init_idle(struct task_struct
*idle
, int cpu
);
271 extern void init_idle_bootup_task(struct task_struct
*idle
);
273 extern int runqueue_is_locked(int cpu
);
275 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
276 extern void nohz_balance_enter_idle(int cpu
);
277 extern void set_cpu_sd_state_idle(void);
278 extern int get_nohz_timer_target(void);
280 static inline void nohz_balance_enter_idle(int cpu
) { }
281 static inline void set_cpu_sd_state_idle(void) { }
285 * Only dump TASK_* tasks. (0 for all tasks)
287 extern void show_state_filter(unsigned long state_filter
);
289 static inline void show_state(void)
291 show_state_filter(0);
294 extern void show_regs(struct pt_regs
*);
297 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
298 * task), SP is the stack pointer of the first frame that should be shown in the back
299 * trace (or NULL if the entire call-chain of the task should be shown).
301 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
303 void io_schedule(void);
304 long io_schedule_timeout(long timeout
);
306 extern void cpu_init (void);
307 extern void trap_init(void);
308 extern void update_process_times(int user
);
309 extern void scheduler_tick(void);
311 extern void sched_show_task(struct task_struct
*p
);
313 #ifdef CONFIG_LOCKUP_DETECTOR
314 extern void touch_softlockup_watchdog(void);
315 extern void touch_softlockup_watchdog_sync(void);
316 extern void touch_all_softlockup_watchdogs(void);
317 extern int proc_dowatchdog_thresh(struct ctl_table
*table
, int write
,
319 size_t *lenp
, loff_t
*ppos
);
320 extern unsigned int softlockup_panic
;
321 void lockup_detector_init(void);
323 static inline void touch_softlockup_watchdog(void)
326 static inline void touch_softlockup_watchdog_sync(void)
329 static inline void touch_all_softlockup_watchdogs(void)
332 static inline void lockup_detector_init(void)
337 #ifdef CONFIG_DETECT_HUNG_TASK
338 extern unsigned int sysctl_hung_task_panic
;
339 extern unsigned long sysctl_hung_task_check_count
;
340 extern unsigned long sysctl_hung_task_timeout_secs
;
341 extern unsigned long sysctl_hung_task_warnings
;
342 extern int proc_dohung_task_timeout_secs(struct ctl_table
*table
, int write
,
344 size_t *lenp
, loff_t
*ppos
);
346 /* Avoid need for ifdefs elsewhere in the code */
347 enum { sysctl_hung_task_timeout_secs
= 0 };
350 /* Attach to any functions which should be ignored in wchan output. */
351 #define __sched __attribute__((__section__(".sched.text")))
353 /* Linker adds these: start and end of __sched functions */
354 extern char __sched_text_start
[], __sched_text_end
[];
356 /* Is this address in the __sched functions? */
357 extern int in_sched_functions(unsigned long addr
);
359 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
360 extern signed long schedule_timeout(signed long timeout
);
361 extern signed long schedule_timeout_interruptible(signed long timeout
);
362 extern signed long schedule_timeout_killable(signed long timeout
);
363 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
364 asmlinkage
void schedule(void);
365 extern void schedule_preempt_disabled(void);
366 extern int mutex_spin_on_owner(struct mutex
*lock
, struct task_struct
*owner
);
369 struct user_namespace
;
372 * Default maximum number of active map areas, this limits the number of vmas
373 * per mm struct. Users can overwrite this number by sysctl but there is a
376 * When a program's coredump is generated as ELF format, a section is created
377 * per a vma. In ELF, the number of sections is represented in unsigned short.
378 * This means the number of sections should be smaller than 65535 at coredump.
379 * Because the kernel adds some informative sections to a image of program at
380 * generating coredump, we need some margin. The number of extra sections is
381 * 1-3 now and depends on arch. We use "5" as safe margin, here.
383 #define MAPCOUNT_ELF_CORE_MARGIN (5)
384 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
386 extern int sysctl_max_map_count
;
388 #include <linux/aio.h>
391 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
393 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
394 unsigned long, unsigned long);
396 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
397 unsigned long len
, unsigned long pgoff
,
398 unsigned long flags
);
399 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
400 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
402 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
) {}
406 extern void set_dumpable(struct mm_struct
*mm
, int value
);
407 extern int get_dumpable(struct mm_struct
*mm
);
409 /* get/set_dumpable() values */
410 #define SUID_DUMPABLE_DISABLED 0
411 #define SUID_DUMPABLE_ENABLED 1
412 #define SUID_DUMPABLE_SAFE 2
416 #define MMF_DUMPABLE 0 /* core dump is permitted */
417 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
419 #define MMF_DUMPABLE_BITS 2
420 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
422 /* coredump filter bits */
423 #define MMF_DUMP_ANON_PRIVATE 2
424 #define MMF_DUMP_ANON_SHARED 3
425 #define MMF_DUMP_MAPPED_PRIVATE 4
426 #define MMF_DUMP_MAPPED_SHARED 5
427 #define MMF_DUMP_ELF_HEADERS 6
428 #define MMF_DUMP_HUGETLB_PRIVATE 7
429 #define MMF_DUMP_HUGETLB_SHARED 8
431 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
432 #define MMF_DUMP_FILTER_BITS 7
433 #define MMF_DUMP_FILTER_MASK \
434 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
435 #define MMF_DUMP_FILTER_DEFAULT \
436 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
437 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
439 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
440 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
442 # define MMF_DUMP_MASK_DEFAULT_ELF 0
444 /* leave room for more dump flags */
445 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
446 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
447 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
449 #define MMF_HAS_UPROBES 19 /* has uprobes */
450 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
452 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
454 struct sighand_struct
{
456 struct k_sigaction action
[_NSIG
];
458 wait_queue_head_t signalfd_wqh
;
461 struct pacct_struct
{
464 unsigned long ac_mem
;
465 cputime_t ac_utime
, ac_stime
;
466 unsigned long ac_minflt
, ac_majflt
;
477 * struct task_cputime - collected CPU time counts
478 * @utime: time spent in user mode, in &cputime_t units
479 * @stime: time spent in kernel mode, in &cputime_t units
480 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
482 * This structure groups together three kinds of CPU time that are
483 * tracked for threads and thread groups. Most things considering
484 * CPU time want to group these counts together and treat all three
485 * of them in parallel.
487 struct task_cputime
{
490 unsigned long long sum_exec_runtime
;
492 /* Alternate field names when used to cache expirations. */
493 #define prof_exp stime
494 #define virt_exp utime
495 #define sched_exp sum_exec_runtime
497 #define INIT_CPUTIME \
498 (struct task_cputime) { \
501 .sum_exec_runtime = 0, \
505 * Disable preemption until the scheduler is running.
506 * Reset by start_kernel()->sched_init()->init_idle().
508 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
509 * before the scheduler is active -- see should_resched().
511 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
514 * struct thread_group_cputimer - thread group interval timer counts
515 * @cputime: thread group interval timers.
516 * @running: non-zero when there are timers running and
517 * @cputime receives updates.
518 * @lock: lock for fields in this struct.
520 * This structure contains the version of task_cputime, above, that is
521 * used for thread group CPU timer calculations.
523 struct thread_group_cputimer
{
524 struct task_cputime cputime
;
529 #include <linux/rwsem.h>
533 * NOTE! "signal_struct" does not have its own
534 * locking, because a shared signal_struct always
535 * implies a shared sighand_struct, so locking
536 * sighand_struct is always a proper superset of
537 * the locking of signal_struct.
539 struct signal_struct
{
544 wait_queue_head_t wait_chldexit
; /* for wait4() */
546 /* current thread group signal load-balancing target: */
547 struct task_struct
*curr_target
;
549 /* shared signal handling: */
550 struct sigpending shared_pending
;
552 /* thread group exit support */
555 * - notify group_exit_task when ->count is equal to notify_count
556 * - everyone except group_exit_task is stopped during signal delivery
557 * of fatal signals, group_exit_task processes the signal.
560 struct task_struct
*group_exit_task
;
562 /* thread group stop support, overloads group_exit_code too */
563 int group_stop_count
;
564 unsigned int flags
; /* see SIGNAL_* flags below */
567 * PR_SET_CHILD_SUBREAPER marks a process, like a service
568 * manager, to re-parent orphan (double-forking) child processes
569 * to this process instead of 'init'. The service manager is
570 * able to receive SIGCHLD signals and is able to investigate
571 * the process until it calls wait(). All children of this
572 * process will inherit a flag if they should look for a
573 * child_subreaper process at exit.
575 unsigned int is_child_subreaper
:1;
576 unsigned int has_child_subreaper
:1;
578 /* POSIX.1b Interval Timers */
579 struct list_head posix_timers
;
581 /* ITIMER_REAL timer for the process */
582 struct hrtimer real_timer
;
583 struct pid
*leader_pid
;
584 ktime_t it_real_incr
;
587 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
588 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
589 * values are defined to 0 and 1 respectively
591 struct cpu_itimer it
[2];
594 * Thread group totals for process CPU timers.
595 * See thread_group_cputimer(), et al, for details.
597 struct thread_group_cputimer cputimer
;
599 /* Earliest-expiration cache. */
600 struct task_cputime cputime_expires
;
602 struct list_head cpu_timers
[3];
604 struct pid
*tty_old_pgrp
;
606 /* boolean value for session group leader */
609 struct tty_struct
*tty
; /* NULL if no tty */
611 #ifdef CONFIG_SCHED_AUTOGROUP
612 struct autogroup
*autogroup
;
615 * Cumulative resource counters for dead threads in the group,
616 * and for reaped dead child processes forked by this group.
617 * Live threads maintain their own counters and add to these
618 * in __exit_signal, except for the group leader.
620 cputime_t utime
, stime
, cutime
, cstime
;
623 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
624 cputime_t prev_utime
, prev_stime
;
626 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
627 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
628 unsigned long inblock
, oublock
, cinblock
, coublock
;
629 unsigned long maxrss
, cmaxrss
;
630 struct task_io_accounting ioac
;
633 * Cumulative ns of schedule CPU time fo dead threads in the
634 * group, not including a zombie group leader, (This only differs
635 * from jiffies_to_ns(utime + stime) if sched_clock uses something
636 * other than jiffies.)
638 unsigned long long sum_sched_runtime
;
641 * We don't bother to synchronize most readers of this at all,
642 * because there is no reader checking a limit that actually needs
643 * to get both rlim_cur and rlim_max atomically, and either one
644 * alone is a single word that can safely be read normally.
645 * getrlimit/setrlimit use task_lock(current->group_leader) to
646 * protect this instead of the siglock, because they really
647 * have no need to disable irqs.
649 struct rlimit rlim
[RLIM_NLIMITS
];
651 #ifdef CONFIG_BSD_PROCESS_ACCT
652 struct pacct_struct pacct
; /* per-process accounting information */
654 #ifdef CONFIG_TASKSTATS
655 struct taskstats
*stats
;
659 struct tty_audit_buf
*tty_audit_buf
;
661 #ifdef CONFIG_CGROUPS
663 * group_rwsem prevents new tasks from entering the threadgroup and
664 * member tasks from exiting,a more specifically, setting of
665 * PF_EXITING. fork and exit paths are protected with this rwsem
666 * using threadgroup_change_begin/end(). Users which require
667 * threadgroup to remain stable should use threadgroup_[un]lock()
668 * which also takes care of exec path. Currently, cgroup is the
671 struct rw_semaphore group_rwsem
;
674 int oom_score_adj
; /* OOM kill score adjustment */
675 int oom_score_adj_min
; /* OOM kill score adjustment minimum value.
676 * Only settable by CAP_SYS_RESOURCE. */
678 struct mutex cred_guard_mutex
; /* guard against foreign influences on
679 * credential calculations
680 * (notably. ptrace) */
684 * Bits in flags field of signal_struct.
686 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
687 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
688 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
690 * Pending notifications to parent.
692 #define SIGNAL_CLD_STOPPED 0x00000010
693 #define SIGNAL_CLD_CONTINUED 0x00000020
694 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
696 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
698 /* If true, all threads except ->group_exit_task have pending SIGKILL */
699 static inline int signal_group_exit(const struct signal_struct
*sig
)
701 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
702 (sig
->group_exit_task
!= NULL
);
706 * Some day this will be a full-fledged user tracking system..
709 atomic_t __count
; /* reference count */
710 atomic_t processes
; /* How many processes does this user have? */
711 atomic_t files
; /* How many open files does this user have? */
712 atomic_t sigpending
; /* How many pending signals does this user have? */
713 #ifdef CONFIG_INOTIFY_USER
714 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
715 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
717 #ifdef CONFIG_FANOTIFY
718 atomic_t fanotify_listeners
;
721 atomic_long_t epoll_watches
; /* The number of file descriptors currently watched */
723 #ifdef CONFIG_POSIX_MQUEUE
724 /* protected by mq_lock */
725 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
727 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
730 struct key
*uid_keyring
; /* UID specific keyring */
731 struct key
*session_keyring
; /* UID's default session keyring */
734 /* Hash table maintenance information */
735 struct hlist_node uidhash_node
;
738 #ifdef CONFIG_PERF_EVENTS
739 atomic_long_t locked_vm
;
743 extern int uids_sysfs_init(void);
745 extern struct user_struct
*find_user(kuid_t
);
747 extern struct user_struct root_user
;
748 #define INIT_USER (&root_user)
751 struct backing_dev_info
;
752 struct reclaim_state
;
754 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
756 /* cumulative counters */
757 unsigned long pcount
; /* # of times run on this cpu */
758 unsigned long long run_delay
; /* time spent waiting on a runqueue */
761 unsigned long long last_arrival
,/* when we last ran on a cpu */
762 last_queued
; /* when we were last queued to run */
764 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
766 #ifdef CONFIG_TASK_DELAY_ACCT
767 struct task_delay_info
{
769 unsigned int flags
; /* Private per-task flags */
771 /* For each stat XXX, add following, aligned appropriately
773 * struct timespec XXX_start, XXX_end;
777 * Atomicity of updates to XXX_delay, XXX_count protected by
778 * single lock above (split into XXX_lock if contention is an issue).
782 * XXX_count is incremented on every XXX operation, the delay
783 * associated with the operation is added to XXX_delay.
784 * XXX_delay contains the accumulated delay time in nanoseconds.
786 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
787 u64 blkio_delay
; /* wait for sync block io completion */
788 u64 swapin_delay
; /* wait for swapin block io completion */
789 u32 blkio_count
; /* total count of the number of sync block */
790 /* io operations performed */
791 u32 swapin_count
; /* total count of the number of swapin block */
792 /* io operations performed */
794 struct timespec freepages_start
, freepages_end
;
795 u64 freepages_delay
; /* wait for memory reclaim */
796 u32 freepages_count
; /* total count of memory reclaim */
798 #endif /* CONFIG_TASK_DELAY_ACCT */
800 static inline int sched_info_on(void)
802 #ifdef CONFIG_SCHEDSTATS
804 #elif defined(CONFIG_TASK_DELAY_ACCT)
805 extern int delayacct_on
;
820 * Increase resolution of nice-level calculations for 64-bit architectures.
821 * The extra resolution improves shares distribution and load balancing of
822 * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
823 * hierarchies, especially on larger systems. This is not a user-visible change
824 * and does not change the user-interface for setting shares/weights.
826 * We increase resolution only if we have enough bits to allow this increased
827 * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
828 * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
831 #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */
832 # define SCHED_LOAD_RESOLUTION 10
833 # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION)
834 # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION)
836 # define SCHED_LOAD_RESOLUTION 0
837 # define scale_load(w) (w)
838 # define scale_load_down(w) (w)
841 #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION)
842 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
845 * Increase resolution of cpu_power calculations
847 #define SCHED_POWER_SHIFT 10
848 #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
851 * sched-domains (multiprocessor balancing) declarations:
854 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
855 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
856 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
857 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
858 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
859 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
860 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
861 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
862 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
863 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
864 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
865 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
867 extern int __weak
arch_sd_sibiling_asym_packing(void);
869 struct sched_group_power
{
872 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
875 unsigned int power
, power_orig
;
876 unsigned long next_update
;
878 * Number of busy cpus in this group.
880 atomic_t nr_busy_cpus
;
882 unsigned long cpumask
[0]; /* iteration mask */
886 struct sched_group
*next
; /* Must be a circular list */
889 unsigned int group_weight
;
890 struct sched_group_power
*sgp
;
893 * The CPUs this group covers.
895 * NOTE: this field is variable length. (Allocated dynamically
896 * by attaching extra space to the end of the structure,
897 * depending on how many CPUs the kernel has booted up with)
899 unsigned long cpumask
[0];
902 static inline struct cpumask
*sched_group_cpus(struct sched_group
*sg
)
904 return to_cpumask(sg
->cpumask
);
908 * cpumask masking which cpus in the group are allowed to iterate up the domain
911 static inline struct cpumask
*sched_group_mask(struct sched_group
*sg
)
913 return to_cpumask(sg
->sgp
->cpumask
);
917 * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
918 * @group: The group whose first cpu is to be returned.
920 static inline unsigned int group_first_cpu(struct sched_group
*group
)
922 return cpumask_first(sched_group_cpus(group
));
925 struct sched_domain_attr
{
926 int relax_domain_level
;
929 #define SD_ATTR_INIT (struct sched_domain_attr) { \
930 .relax_domain_level = -1, \
933 extern int sched_domain_level_max
;
935 struct sched_domain
{
936 /* These fields must be setup */
937 struct sched_domain
*parent
; /* top domain must be null terminated */
938 struct sched_domain
*child
; /* bottom domain must be null terminated */
939 struct sched_group
*groups
; /* the balancing groups of the domain */
940 unsigned long min_interval
; /* Minimum balance interval ms */
941 unsigned long max_interval
; /* Maximum balance interval ms */
942 unsigned int busy_factor
; /* less balancing by factor if busy */
943 unsigned int imbalance_pct
; /* No balance until over watermark */
944 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
945 unsigned int busy_idx
;
946 unsigned int idle_idx
;
947 unsigned int newidle_idx
;
948 unsigned int wake_idx
;
949 unsigned int forkexec_idx
;
950 unsigned int smt_gain
;
951 int flags
; /* See SD_* */
954 /* Runtime fields. */
955 unsigned long last_balance
; /* init to jiffies. units in jiffies */
956 unsigned int balance_interval
; /* initialise to 1. units in ms. */
957 unsigned int nr_balance_failed
; /* initialise to 0 */
961 #ifdef CONFIG_SCHEDSTATS
962 /* load_balance() stats */
963 unsigned int lb_count
[CPU_MAX_IDLE_TYPES
];
964 unsigned int lb_failed
[CPU_MAX_IDLE_TYPES
];
965 unsigned int lb_balanced
[CPU_MAX_IDLE_TYPES
];
966 unsigned int lb_imbalance
[CPU_MAX_IDLE_TYPES
];
967 unsigned int lb_gained
[CPU_MAX_IDLE_TYPES
];
968 unsigned int lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
969 unsigned int lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
970 unsigned int lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
972 /* Active load balancing */
973 unsigned int alb_count
;
974 unsigned int alb_failed
;
975 unsigned int alb_pushed
;
977 /* SD_BALANCE_EXEC stats */
978 unsigned int sbe_count
;
979 unsigned int sbe_balanced
;
980 unsigned int sbe_pushed
;
982 /* SD_BALANCE_FORK stats */
983 unsigned int sbf_count
;
984 unsigned int sbf_balanced
;
985 unsigned int sbf_pushed
;
987 /* try_to_wake_up() stats */
988 unsigned int ttwu_wake_remote
;
989 unsigned int ttwu_move_affine
;
990 unsigned int ttwu_move_balance
;
992 #ifdef CONFIG_SCHED_DEBUG
996 void *private; /* used during construction */
997 struct rcu_head rcu
; /* used during destruction */
1000 unsigned int span_weight
;
1002 * Span of all CPUs in this domain.
1004 * NOTE: this field is variable length. (Allocated dynamically
1005 * by attaching extra space to the end of the structure,
1006 * depending on how many CPUs the kernel has booted up with)
1008 unsigned long span
[0];
1011 static inline struct cpumask
*sched_domain_span(struct sched_domain
*sd
)
1013 return to_cpumask(sd
->span
);
1016 extern void partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
1017 struct sched_domain_attr
*dattr_new
);
1019 /* Allocate an array of sched domains, for partition_sched_domains(). */
1020 cpumask_var_t
*alloc_sched_domains(unsigned int ndoms
);
1021 void free_sched_domains(cpumask_var_t doms
[], unsigned int ndoms
);
1023 /* Test a flag in parent sched domain */
1024 static inline int test_sd_parent(struct sched_domain
*sd
, int flag
)
1026 if (sd
->parent
&& (sd
->parent
->flags
& flag
))
1032 unsigned long default_scale_freq_power(struct sched_domain
*sd
, int cpu
);
1033 unsigned long default_scale_smt_power(struct sched_domain
*sd
, int cpu
);
1035 bool cpus_share_cache(int this_cpu
, int that_cpu
);
1037 #else /* CONFIG_SMP */
1039 struct sched_domain_attr
;
1042 partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
1043 struct sched_domain_attr
*dattr_new
)
1047 static inline bool cpus_share_cache(int this_cpu
, int that_cpu
)
1052 #endif /* !CONFIG_SMP */
1055 struct io_context
; /* See blkdev.h */
1058 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1059 extern void prefetch_stack(struct task_struct
*t
);
1061 static inline void prefetch_stack(struct task_struct
*t
) { }
1064 struct audit_context
; /* See audit.c */
1066 struct pipe_inode_info
;
1067 struct uts_namespace
;
1070 struct sched_domain
;
1075 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
1076 #define WF_FORK 0x02 /* child wakeup after fork */
1077 #define WF_MIGRATED 0x04 /* internal use, task got migrated */
1079 #define ENQUEUE_WAKEUP 1
1080 #define ENQUEUE_HEAD 2
1082 #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */
1084 #define ENQUEUE_WAKING 0
1087 #define DEQUEUE_SLEEP 1
1089 struct sched_class
{
1090 const struct sched_class
*next
;
1092 void (*enqueue_task
) (struct rq
*rq
, struct task_struct
*p
, int flags
);
1093 void (*dequeue_task
) (struct rq
*rq
, struct task_struct
*p
, int flags
);
1094 void (*yield_task
) (struct rq
*rq
);
1095 bool (*yield_to_task
) (struct rq
*rq
, struct task_struct
*p
, bool preempt
);
1097 void (*check_preempt_curr
) (struct rq
*rq
, struct task_struct
*p
, int flags
);
1099 struct task_struct
* (*pick_next_task
) (struct rq
*rq
);
1100 void (*put_prev_task
) (struct rq
*rq
, struct task_struct
*p
);
1103 int (*select_task_rq
)(struct task_struct
*p
, int sd_flag
, int flags
);
1105 void (*pre_schedule
) (struct rq
*this_rq
, struct task_struct
*task
);
1106 void (*post_schedule
) (struct rq
*this_rq
);
1107 void (*task_waking
) (struct task_struct
*task
);
1108 void (*task_woken
) (struct rq
*this_rq
, struct task_struct
*task
);
1110 void (*set_cpus_allowed
)(struct task_struct
*p
,
1111 const struct cpumask
*newmask
);
1113 void (*rq_online
)(struct rq
*rq
);
1114 void (*rq_offline
)(struct rq
*rq
);
1117 void (*set_curr_task
) (struct rq
*rq
);
1118 void (*task_tick
) (struct rq
*rq
, struct task_struct
*p
, int queued
);
1119 void (*task_fork
) (struct task_struct
*p
);
1121 void (*switched_from
) (struct rq
*this_rq
, struct task_struct
*task
);
1122 void (*switched_to
) (struct rq
*this_rq
, struct task_struct
*task
);
1123 void (*prio_changed
) (struct rq
*this_rq
, struct task_struct
*task
,
1126 unsigned int (*get_rr_interval
) (struct rq
*rq
,
1127 struct task_struct
*task
);
1129 #ifdef CONFIG_FAIR_GROUP_SCHED
1130 void (*task_move_group
) (struct task_struct
*p
, int on_rq
);
1134 struct load_weight
{
1135 unsigned long weight
, inv_weight
;
1138 #ifdef CONFIG_SCHEDSTATS
1139 struct sched_statistics
{
1149 s64 sum_sleep_runtime
;
1156 u64 nr_migrations_cold
;
1157 u64 nr_failed_migrations_affine
;
1158 u64 nr_failed_migrations_running
;
1159 u64 nr_failed_migrations_hot
;
1160 u64 nr_forced_migrations
;
1163 u64 nr_wakeups_sync
;
1164 u64 nr_wakeups_migrate
;
1165 u64 nr_wakeups_local
;
1166 u64 nr_wakeups_remote
;
1167 u64 nr_wakeups_affine
;
1168 u64 nr_wakeups_affine_attempts
;
1169 u64 nr_wakeups_passive
;
1170 u64 nr_wakeups_idle
;
1174 struct sched_entity
{
1175 struct load_weight load
; /* for load-balancing */
1176 struct rb_node run_node
;
1177 struct list_head group_node
;
1181 u64 sum_exec_runtime
;
1183 u64 prev_sum_exec_runtime
;
1187 #ifdef CONFIG_SCHEDSTATS
1188 struct sched_statistics statistics
;
1191 #ifdef CONFIG_FAIR_GROUP_SCHED
1192 struct sched_entity
*parent
;
1193 /* rq on which this entity is (to be) queued: */
1194 struct cfs_rq
*cfs_rq
;
1195 /* rq "owned" by this entity/group: */
1196 struct cfs_rq
*my_q
;
1200 struct sched_rt_entity
{
1201 struct list_head run_list
;
1202 unsigned long timeout
;
1203 unsigned int time_slice
;
1205 struct sched_rt_entity
*back
;
1206 #ifdef CONFIG_RT_GROUP_SCHED
1207 struct sched_rt_entity
*parent
;
1208 /* rq on which this entity is (to be) queued: */
1209 struct rt_rq
*rt_rq
;
1210 /* rq "owned" by this entity/group: */
1216 * default timeslice is 100 msecs (used only for SCHED_RR tasks).
1217 * Timeslices get refilled after they expire.
1219 #define RR_TIMESLICE (100 * HZ / 1000)
1223 enum perf_event_task_context
{
1224 perf_invalid_context
= -1,
1225 perf_hw_context
= 0,
1227 perf_nr_task_contexts
,
1230 struct task_struct
{
1231 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
1234 unsigned int flags
; /* per process flags, defined below */
1235 unsigned int ptrace
;
1238 struct llist_node wake_entry
;
1243 int prio
, static_prio
, normal_prio
;
1244 unsigned int rt_priority
;
1245 const struct sched_class
*sched_class
;
1246 struct sched_entity se
;
1247 struct sched_rt_entity rt
;
1248 #ifdef CONFIG_CGROUP_SCHED
1249 struct task_group
*sched_task_group
;
1252 #ifdef CONFIG_PREEMPT_NOTIFIERS
1253 /* list of struct preempt_notifier: */
1254 struct hlist_head preempt_notifiers
;
1258 * fpu_counter contains the number of consecutive context switches
1259 * that the FPU is used. If this is over a threshold, the lazy fpu
1260 * saving becomes unlazy to save the trap. This is an unsigned char
1261 * so that after 256 times the counter wraps and the behavior turns
1262 * lazy again; this to deal with bursty apps that only use FPU for
1265 unsigned char fpu_counter
;
1266 #ifdef CONFIG_BLK_DEV_IO_TRACE
1267 unsigned int btrace_seq
;
1270 unsigned int policy
;
1271 int nr_cpus_allowed
;
1272 cpumask_t cpus_allowed
;
1274 #ifdef CONFIG_PREEMPT_RCU
1275 int rcu_read_lock_nesting
;
1276 char rcu_read_unlock_special
;
1277 struct list_head rcu_node_entry
;
1278 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1279 #ifdef CONFIG_TREE_PREEMPT_RCU
1280 struct rcu_node
*rcu_blocked_node
;
1281 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1282 #ifdef CONFIG_RCU_BOOST
1283 struct rt_mutex
*rcu_boost_mutex
;
1284 #endif /* #ifdef CONFIG_RCU_BOOST */
1286 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1287 struct sched_info sched_info
;
1290 struct list_head tasks
;
1292 struct plist_node pushable_tasks
;
1295 struct mm_struct
*mm
, *active_mm
;
1296 #ifdef CONFIG_COMPAT_BRK
1297 unsigned brk_randomized
:1;
1299 #if defined(SPLIT_RSS_COUNTING)
1300 struct task_rss_stat rss_stat
;
1304 int exit_code
, exit_signal
;
1305 int pdeath_signal
; /* The signal sent when the parent dies */
1306 unsigned int jobctl
; /* JOBCTL_*, siglock protected */
1308 unsigned int personality
;
1309 unsigned did_exec
:1;
1310 unsigned in_execve
:1; /* Tell the LSMs that the process is doing an
1312 unsigned in_iowait
:1;
1314 /* task may not gain privileges */
1315 unsigned no_new_privs
:1;
1317 /* Revert to default priority/policy when forking */
1318 unsigned sched_reset_on_fork
:1;
1319 unsigned sched_contributes_to_load
:1;
1324 #ifdef CONFIG_CC_STACKPROTECTOR
1325 /* Canary value for the -fstack-protector gcc feature */
1326 unsigned long stack_canary
;
1329 * pointers to (original) parent process, youngest child, younger sibling,
1330 * older sibling, respectively. (p->father can be replaced with
1331 * p->real_parent->pid)
1333 struct task_struct __rcu
*real_parent
; /* real parent process */
1334 struct task_struct __rcu
*parent
; /* recipient of SIGCHLD, wait4() reports */
1336 * children/sibling forms the list of my natural children
1338 struct list_head children
; /* list of my children */
1339 struct list_head sibling
; /* linkage in my parent's children list */
1340 struct task_struct
*group_leader
; /* threadgroup leader */
1343 * ptraced is the list of tasks this task is using ptrace on.
1344 * This includes both natural children and PTRACE_ATTACH targets.
1345 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1347 struct list_head ptraced
;
1348 struct list_head ptrace_entry
;
1350 /* PID/PID hash table linkage. */
1351 struct pid_link pids
[PIDTYPE_MAX
];
1352 struct list_head thread_group
;
1354 struct completion
*vfork_done
; /* for vfork() */
1355 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
1356 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
1358 cputime_t utime
, stime
, utimescaled
, stimescaled
;
1360 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
1361 cputime_t prev_utime
, prev_stime
;
1363 unsigned long nvcsw
, nivcsw
; /* context switch counts */
1364 struct timespec start_time
; /* monotonic time */
1365 struct timespec real_start_time
; /* boot based time */
1366 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1367 unsigned long min_flt
, maj_flt
;
1369 struct task_cputime cputime_expires
;
1370 struct list_head cpu_timers
[3];
1372 /* process credentials */
1373 const struct cred __rcu
*real_cred
; /* objective and real subjective task
1374 * credentials (COW) */
1375 const struct cred __rcu
*cred
; /* effective (overridable) subjective task
1376 * credentials (COW) */
1377 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
1378 - access with [gs]et_task_comm (which lock
1379 it with task_lock())
1380 - initialized normally by setup_new_exec */
1381 /* file system info */
1382 int link_count
, total_link_count
;
1383 #ifdef CONFIG_SYSVIPC
1385 struct sysv_sem sysvsem
;
1387 #ifdef CONFIG_DETECT_HUNG_TASK
1388 /* hung task detection */
1389 unsigned long last_switch_count
;
1391 /* CPU-specific state of this task */
1392 struct thread_struct thread
;
1393 /* filesystem information */
1394 struct fs_struct
*fs
;
1395 /* open file information */
1396 struct files_struct
*files
;
1398 struct nsproxy
*nsproxy
;
1399 /* signal handlers */
1400 struct signal_struct
*signal
;
1401 struct sighand_struct
*sighand
;
1403 sigset_t blocked
, real_blocked
;
1404 sigset_t saved_sigmask
; /* restored if set_restore_sigmask() was used */
1405 struct sigpending pending
;
1407 unsigned long sas_ss_sp
;
1409 int (*notifier
)(void *priv
);
1410 void *notifier_data
;
1411 sigset_t
*notifier_mask
;
1412 struct callback_head
*task_works
;
1414 struct audit_context
*audit_context
;
1415 #ifdef CONFIG_AUDITSYSCALL
1417 unsigned int sessionid
;
1419 struct seccomp seccomp
;
1421 /* Thread group tracking */
1424 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1426 spinlock_t alloc_lock
;
1428 /* Protection of the PI data structures: */
1429 raw_spinlock_t pi_lock
;
1431 #ifdef CONFIG_RT_MUTEXES
1432 /* PI waiters blocked on a rt_mutex held by this task */
1433 struct plist_head pi_waiters
;
1434 /* Deadlock detection and priority inheritance handling */
1435 struct rt_mutex_waiter
*pi_blocked_on
;
1438 #ifdef CONFIG_DEBUG_MUTEXES
1439 /* mutex deadlock detection */
1440 struct mutex_waiter
*blocked_on
;
1442 #ifdef CONFIG_TRACE_IRQFLAGS
1443 unsigned int irq_events
;
1444 unsigned long hardirq_enable_ip
;
1445 unsigned long hardirq_disable_ip
;
1446 unsigned int hardirq_enable_event
;
1447 unsigned int hardirq_disable_event
;
1448 int hardirqs_enabled
;
1449 int hardirq_context
;
1450 unsigned long softirq_disable_ip
;
1451 unsigned long softirq_enable_ip
;
1452 unsigned int softirq_disable_event
;
1453 unsigned int softirq_enable_event
;
1454 int softirqs_enabled
;
1455 int softirq_context
;
1457 #ifdef CONFIG_LOCKDEP
1458 # define MAX_LOCK_DEPTH 48UL
1461 unsigned int lockdep_recursion
;
1462 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1463 gfp_t lockdep_reclaim_gfp
;
1466 /* journalling filesystem info */
1469 /* stacked block device info */
1470 struct bio_list
*bio_list
;
1473 /* stack plugging */
1474 struct blk_plug
*plug
;
1478 struct reclaim_state
*reclaim_state
;
1480 struct backing_dev_info
*backing_dev_info
;
1482 struct io_context
*io_context
;
1484 unsigned long ptrace_message
;
1485 siginfo_t
*last_siginfo
; /* For ptrace use. */
1486 struct task_io_accounting ioac
;
1487 #if defined(CONFIG_TASK_XACCT)
1488 u64 acct_rss_mem1
; /* accumulated rss usage */
1489 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1490 cputime_t acct_timexpd
; /* stime + utime since last update */
1492 #ifdef CONFIG_CPUSETS
1493 nodemask_t mems_allowed
; /* Protected by alloc_lock */
1494 seqcount_t mems_allowed_seq
; /* Seqence no to catch updates */
1495 int cpuset_mem_spread_rotor
;
1496 int cpuset_slab_spread_rotor
;
1498 #ifdef CONFIG_CGROUPS
1499 /* Control Group info protected by css_set_lock */
1500 struct css_set __rcu
*cgroups
;
1501 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1502 struct list_head cg_list
;
1505 struct robust_list_head __user
*robust_list
;
1506 #ifdef CONFIG_COMPAT
1507 struct compat_robust_list_head __user
*compat_robust_list
;
1509 struct list_head pi_state_list
;
1510 struct futex_pi_state
*pi_state_cache
;
1512 #ifdef CONFIG_PERF_EVENTS
1513 struct perf_event_context
*perf_event_ctxp
[perf_nr_task_contexts
];
1514 struct mutex perf_event_mutex
;
1515 struct list_head perf_event_list
;
1518 struct mempolicy
*mempolicy
; /* Protected by alloc_lock */
1520 short pref_node_fork
;
1522 struct rcu_head rcu
;
1525 * cache last used pipe for splice
1527 struct pipe_inode_info
*splice_pipe
;
1529 struct page_frag task_frag
;
1531 #ifdef CONFIG_TASK_DELAY_ACCT
1532 struct task_delay_info
*delays
;
1534 #ifdef CONFIG_FAULT_INJECTION
1538 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1539 * balance_dirty_pages() for some dirty throttling pause
1542 int nr_dirtied_pause
;
1543 unsigned long dirty_paused_when
; /* start of a write-and-pause period */
1545 #ifdef CONFIG_LATENCYTOP
1546 int latency_record_count
;
1547 struct latency_record latency_record
[LT_SAVECOUNT
];
1550 * time slack values; these are used to round up poll() and
1551 * select() etc timeout values. These are in nanoseconds.
1553 unsigned long timer_slack_ns
;
1554 unsigned long default_timer_slack_ns
;
1556 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1557 /* Index of current stored address in ret_stack */
1559 /* Stack of return addresses for return function tracing */
1560 struct ftrace_ret_stack
*ret_stack
;
1561 /* time stamp for last schedule */
1562 unsigned long long ftrace_timestamp
;
1564 * Number of functions that haven't been traced
1565 * because of depth overrun.
1567 atomic_t trace_overrun
;
1568 /* Pause for the tracing */
1569 atomic_t tracing_graph_pause
;
1571 #ifdef CONFIG_TRACING
1572 /* state flags for use by tracers */
1573 unsigned long trace
;
1574 /* bitmask and counter of trace recursion */
1575 unsigned long trace_recursion
;
1576 #endif /* CONFIG_TRACING */
1577 #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
1578 struct memcg_batch_info
{
1579 int do_batch
; /* incremented when batch uncharge started */
1580 struct mem_cgroup
*memcg
; /* target memcg of uncharge */
1581 unsigned long nr_pages
; /* uncharged usage */
1582 unsigned long memsw_nr_pages
; /* uncharged mem+swap usage */
1585 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1586 atomic_t ptrace_bp_refcnt
;
1588 #ifdef CONFIG_UPROBES
1589 struct uprobe_task
*utask
;
1593 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1594 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1597 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1598 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1599 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1600 * values are inverted: lower p->prio value means higher priority.
1602 * The MAX_USER_RT_PRIO value allows the actual maximum
1603 * RT priority to be separate from the value exported to
1604 * user-space. This allows kernel threads to set their
1605 * priority to a value higher than any user task. Note:
1606 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1609 #define MAX_USER_RT_PRIO 100
1610 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1612 #define MAX_PRIO (MAX_RT_PRIO + 40)
1613 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1615 static inline int rt_prio(int prio
)
1617 if (unlikely(prio
< MAX_RT_PRIO
))
1622 static inline int rt_task(struct task_struct
*p
)
1624 return rt_prio(p
->prio
);
1627 static inline struct pid
*task_pid(struct task_struct
*task
)
1629 return task
->pids
[PIDTYPE_PID
].pid
;
1632 static inline struct pid
*task_tgid(struct task_struct
*task
)
1634 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1638 * Without tasklist or rcu lock it is not safe to dereference
1639 * the result of task_pgrp/task_session even if task == current,
1640 * we can race with another thread doing sys_setsid/sys_setpgid.
1642 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1644 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1647 static inline struct pid
*task_session(struct task_struct
*task
)
1649 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1652 struct pid_namespace
;
1655 * the helpers to get the task's different pids as they are seen
1656 * from various namespaces
1658 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1659 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1661 * task_xid_nr_ns() : id seen from the ns specified;
1663 * set_task_vxid() : assigns a virtual id to a task;
1665 * see also pid_nr() etc in include/linux/pid.h
1667 pid_t
__task_pid_nr_ns(struct task_struct
*task
, enum pid_type type
,
1668 struct pid_namespace
*ns
);
1670 static inline pid_t
task_pid_nr(struct task_struct
*tsk
)
1675 static inline pid_t
task_pid_nr_ns(struct task_struct
*tsk
,
1676 struct pid_namespace
*ns
)
1678 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, ns
);
1681 static inline pid_t
task_pid_vnr(struct task_struct
*tsk
)
1683 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, NULL
);
1687 static inline pid_t
task_tgid_nr(struct task_struct
*tsk
)
1692 pid_t
task_tgid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1694 static inline pid_t
task_tgid_vnr(struct task_struct
*tsk
)
1696 return pid_vnr(task_tgid(tsk
));
1700 static inline pid_t
task_pgrp_nr_ns(struct task_struct
*tsk
,
1701 struct pid_namespace
*ns
)
1703 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, ns
);
1706 static inline pid_t
task_pgrp_vnr(struct task_struct
*tsk
)
1708 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, NULL
);
1712 static inline pid_t
task_session_nr_ns(struct task_struct
*tsk
,
1713 struct pid_namespace
*ns
)
1715 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, ns
);
1718 static inline pid_t
task_session_vnr(struct task_struct
*tsk
)
1720 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, NULL
);
1723 /* obsolete, do not use */
1724 static inline pid_t
task_pgrp_nr(struct task_struct
*tsk
)
1726 return task_pgrp_nr_ns(tsk
, &init_pid_ns
);
1730 * pid_alive - check that a task structure is not stale
1731 * @p: Task structure to be checked.
1733 * Test if a process is not yet dead (at most zombie state)
1734 * If pid_alive fails, then pointers within the task structure
1735 * can be stale and must not be dereferenced.
1737 static inline int pid_alive(struct task_struct
*p
)
1739 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1743 * is_global_init - check if a task structure is init
1744 * @tsk: Task structure to be checked.
1746 * Check if a task structure is the first user space task the kernel created.
1748 static inline int is_global_init(struct task_struct
*tsk
)
1750 return tsk
->pid
== 1;
1754 * is_container_init:
1755 * check whether in the task is init in its own pid namespace.
1757 extern int is_container_init(struct task_struct
*tsk
);
1759 extern struct pid
*cad_pid
;
1761 extern void free_task(struct task_struct
*tsk
);
1762 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1764 extern void __put_task_struct(struct task_struct
*t
);
1766 static inline void put_task_struct(struct task_struct
*t
)
1768 if (atomic_dec_and_test(&t
->usage
))
1769 __put_task_struct(t
);
1772 extern void task_times(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
1773 extern void thread_group_times(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
1778 #define PF_EXITING 0x00000004 /* getting shut down */
1779 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1780 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1781 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1782 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1783 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1784 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1785 #define PF_DUMPCORE 0x00000200 /* dumped core */
1786 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1787 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1788 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1789 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1790 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1791 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1792 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1793 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1794 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1795 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1796 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1797 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1798 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1799 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1800 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1801 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1802 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1803 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1804 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1807 * Only the _current_ task can read/write to tsk->flags, but other
1808 * tasks can access tsk->flags in readonly mode for example
1809 * with tsk_used_math (like during threaded core dumping).
1810 * There is however an exception to this rule during ptrace
1811 * or during fork: the ptracer task is allowed to write to the
1812 * child->flags of its traced child (same goes for fork, the parent
1813 * can write to the child->flags), because we're guaranteed the
1814 * child is not running and in turn not changing child->flags
1815 * at the same time the parent does it.
1817 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1818 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1819 #define clear_used_math() clear_stopped_child_used_math(current)
1820 #define set_used_math() set_stopped_child_used_math(current)
1821 #define conditional_stopped_child_used_math(condition, child) \
1822 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1823 #define conditional_used_math(condition) \
1824 conditional_stopped_child_used_math(condition, current)
1825 #define copy_to_stopped_child_used_math(child) \
1826 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1827 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1828 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1829 #define used_math() tsk_used_math(current)
1832 * task->jobctl flags
1834 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1836 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1837 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1838 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1839 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1840 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1841 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1842 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1844 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1845 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
1846 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
1847 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
1848 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
1849 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
1850 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
1852 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1853 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
1855 extern bool task_set_jobctl_pending(struct task_struct
*task
,
1857 extern void task_clear_jobctl_trapping(struct task_struct
*task
);
1858 extern void task_clear_jobctl_pending(struct task_struct
*task
,
1861 #ifdef CONFIG_PREEMPT_RCU
1863 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1864 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1866 static inline void rcu_copy_process(struct task_struct
*p
)
1868 p
->rcu_read_lock_nesting
= 0;
1869 p
->rcu_read_unlock_special
= 0;
1870 #ifdef CONFIG_TREE_PREEMPT_RCU
1871 p
->rcu_blocked_node
= NULL
;
1872 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1873 #ifdef CONFIG_RCU_BOOST
1874 p
->rcu_boost_mutex
= NULL
;
1875 #endif /* #ifdef CONFIG_RCU_BOOST */
1876 INIT_LIST_HEAD(&p
->rcu_node_entry
);
1881 static inline void rcu_copy_process(struct task_struct
*p
)
1887 static inline void rcu_switch(struct task_struct
*prev
,
1888 struct task_struct
*next
)
1890 #ifdef CONFIG_RCU_USER_QS
1891 rcu_user_hooks_switch(prev
, next
);
1895 static inline void tsk_restore_flags(struct task_struct
*task
,
1896 unsigned long orig_flags
, unsigned long flags
)
1898 task
->flags
&= ~flags
;
1899 task
->flags
|= orig_flags
& flags
;
1903 extern void do_set_cpus_allowed(struct task_struct
*p
,
1904 const struct cpumask
*new_mask
);
1906 extern int set_cpus_allowed_ptr(struct task_struct
*p
,
1907 const struct cpumask
*new_mask
);
1909 static inline void do_set_cpus_allowed(struct task_struct
*p
,
1910 const struct cpumask
*new_mask
)
1913 static inline int set_cpus_allowed_ptr(struct task_struct
*p
,
1914 const struct cpumask
*new_mask
)
1916 if (!cpumask_test_cpu(0, new_mask
))
1923 void calc_load_enter_idle(void);
1924 void calc_load_exit_idle(void);
1926 static inline void calc_load_enter_idle(void) { }
1927 static inline void calc_load_exit_idle(void) { }
1928 #endif /* CONFIG_NO_HZ */
1930 #ifndef CONFIG_CPUMASK_OFFSTACK
1931 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1933 return set_cpus_allowed_ptr(p
, &new_mask
);
1938 * Do not use outside of architecture code which knows its limitations.
1940 * sched_clock() has no promise of monotonicity or bounded drift between
1941 * CPUs, use (which you should not) requires disabling IRQs.
1943 * Please use one of the three interfaces below.
1945 extern unsigned long long notrace
sched_clock(void);
1947 * See the comment in kernel/sched/clock.c
1949 extern u64
cpu_clock(int cpu
);
1950 extern u64
local_clock(void);
1951 extern u64
sched_clock_cpu(int cpu
);
1954 extern void sched_clock_init(void);
1956 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1957 static inline void sched_clock_tick(void)
1961 static inline void sched_clock_idle_sleep_event(void)
1965 static inline void sched_clock_idle_wakeup_event(u64 delta_ns
)
1970 * Architectures can set this to 1 if they have specified
1971 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1972 * but then during bootup it turns out that sched_clock()
1973 * is reliable after all:
1975 extern int sched_clock_stable
;
1977 extern void sched_clock_tick(void);
1978 extern void sched_clock_idle_sleep_event(void);
1979 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1982 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1984 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1985 * The reason for this explicit opt-in is not to have perf penalty with
1986 * slow sched_clocks.
1988 extern void enable_sched_clock_irqtime(void);
1989 extern void disable_sched_clock_irqtime(void);
1991 static inline void enable_sched_clock_irqtime(void) {}
1992 static inline void disable_sched_clock_irqtime(void) {}
1995 extern unsigned long long
1996 task_sched_runtime(struct task_struct
*task
);
1998 /* sched_exec is called by processes performing an exec */
2000 extern void sched_exec(void);
2002 #define sched_exec() {}
2005 extern void sched_clock_idle_sleep_event(void);
2006 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
2008 #ifdef CONFIG_HOTPLUG_CPU
2009 extern void idle_task_exit(void);
2011 static inline void idle_task_exit(void) {}
2014 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
2015 extern void wake_up_idle_cpu(int cpu
);
2017 static inline void wake_up_idle_cpu(int cpu
) { }
2020 extern unsigned int sysctl_sched_latency
;
2021 extern unsigned int sysctl_sched_min_granularity
;
2022 extern unsigned int sysctl_sched_wakeup_granularity
;
2023 extern unsigned int sysctl_sched_child_runs_first
;
2025 enum sched_tunable_scaling
{
2026 SCHED_TUNABLESCALING_NONE
,
2027 SCHED_TUNABLESCALING_LOG
,
2028 SCHED_TUNABLESCALING_LINEAR
,
2029 SCHED_TUNABLESCALING_END
,
2031 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling
;
2033 #ifdef CONFIG_SCHED_DEBUG
2034 extern unsigned int sysctl_sched_migration_cost
;
2035 extern unsigned int sysctl_sched_nr_migrate
;
2036 extern unsigned int sysctl_sched_time_avg
;
2037 extern unsigned int sysctl_timer_migration
;
2038 extern unsigned int sysctl_sched_shares_window
;
2040 int sched_proc_update_handler(struct ctl_table
*table
, int write
,
2041 void __user
*buffer
, size_t *length
,
2044 #ifdef CONFIG_SCHED_DEBUG
2045 static inline unsigned int get_sysctl_timer_migration(void)
2047 return sysctl_timer_migration
;
2050 static inline unsigned int get_sysctl_timer_migration(void)
2055 extern unsigned int sysctl_sched_rt_period
;
2056 extern int sysctl_sched_rt_runtime
;
2058 int sched_rt_handler(struct ctl_table
*table
, int write
,
2059 void __user
*buffer
, size_t *lenp
,
2062 #ifdef CONFIG_SCHED_AUTOGROUP
2063 extern unsigned int sysctl_sched_autogroup_enabled
;
2065 extern void sched_autogroup_create_attach(struct task_struct
*p
);
2066 extern void sched_autogroup_detach(struct task_struct
*p
);
2067 extern void sched_autogroup_fork(struct signal_struct
*sig
);
2068 extern void sched_autogroup_exit(struct signal_struct
*sig
);
2069 #ifdef CONFIG_PROC_FS
2070 extern void proc_sched_autogroup_show_task(struct task_struct
*p
, struct seq_file
*m
);
2071 extern int proc_sched_autogroup_set_nice(struct task_struct
*p
, int nice
);
2074 static inline void sched_autogroup_create_attach(struct task_struct
*p
) { }
2075 static inline void sched_autogroup_detach(struct task_struct
*p
) { }
2076 static inline void sched_autogroup_fork(struct signal_struct
*sig
) { }
2077 static inline void sched_autogroup_exit(struct signal_struct
*sig
) { }
2080 #ifdef CONFIG_CFS_BANDWIDTH
2081 extern unsigned int sysctl_sched_cfs_bandwidth_slice
;
2084 #ifdef CONFIG_RT_MUTEXES
2085 extern int rt_mutex_getprio(struct task_struct
*p
);
2086 extern void rt_mutex_setprio(struct task_struct
*p
, int prio
);
2087 extern void rt_mutex_adjust_pi(struct task_struct
*p
);
2088 static inline bool tsk_is_pi_blocked(struct task_struct
*tsk
)
2090 return tsk
->pi_blocked_on
!= NULL
;
2093 static inline int rt_mutex_getprio(struct task_struct
*p
)
2095 return p
->normal_prio
;
2097 # define rt_mutex_adjust_pi(p) do { } while (0)
2098 static inline bool tsk_is_pi_blocked(struct task_struct
*tsk
)
2104 extern bool yield_to(struct task_struct
*p
, bool preempt
);
2105 extern void set_user_nice(struct task_struct
*p
, long nice
);
2106 extern int task_prio(const struct task_struct
*p
);
2107 extern int task_nice(const struct task_struct
*p
);
2108 extern int can_nice(const struct task_struct
*p
, const int nice
);
2109 extern int task_curr(const struct task_struct
*p
);
2110 extern int idle_cpu(int cpu
);
2111 extern int sched_setscheduler(struct task_struct
*, int,
2112 const struct sched_param
*);
2113 extern int sched_setscheduler_nocheck(struct task_struct
*, int,
2114 const struct sched_param
*);
2115 extern struct task_struct
*idle_task(int cpu
);
2117 * is_idle_task - is the specified task an idle task?
2118 * @p: the task in question.
2120 static inline bool is_idle_task(const struct task_struct
*p
)
2124 extern struct task_struct
*curr_task(int cpu
);
2125 extern void set_curr_task(int cpu
, struct task_struct
*p
);
2130 * The default (Linux) execution domain.
2132 extern struct exec_domain default_exec_domain
;
2134 union thread_union
{
2135 struct thread_info thread_info
;
2136 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
2139 #ifndef __HAVE_ARCH_KSTACK_END
2140 static inline int kstack_end(void *addr
)
2142 /* Reliable end of stack detection:
2143 * Some APM bios versions misalign the stack
2145 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
2149 extern union thread_union init_thread_union
;
2150 extern struct task_struct init_task
;
2152 extern struct mm_struct init_mm
;
2154 extern struct pid_namespace init_pid_ns
;
2157 * find a task by one of its numerical ids
2159 * find_task_by_pid_ns():
2160 * finds a task by its pid in the specified namespace
2161 * find_task_by_vpid():
2162 * finds a task by its virtual pid
2164 * see also find_vpid() etc in include/linux/pid.h
2167 extern struct task_struct
*find_task_by_vpid(pid_t nr
);
2168 extern struct task_struct
*find_task_by_pid_ns(pid_t nr
,
2169 struct pid_namespace
*ns
);
2171 extern void __set_special_pids(struct pid
*pid
);
2173 /* per-UID process charging. */
2174 extern struct user_struct
* alloc_uid(kuid_t
);
2175 static inline struct user_struct
*get_uid(struct user_struct
*u
)
2177 atomic_inc(&u
->__count
);
2180 extern void free_uid(struct user_struct
*);
2182 #include <asm/current.h>
2184 extern void xtime_update(unsigned long ticks
);
2186 extern int wake_up_state(struct task_struct
*tsk
, unsigned int state
);
2187 extern int wake_up_process(struct task_struct
*tsk
);
2188 extern void wake_up_new_task(struct task_struct
*tsk
);
2190 extern void kick_process(struct task_struct
*tsk
);
2192 static inline void kick_process(struct task_struct
*tsk
) { }
2194 extern void sched_fork(struct task_struct
*p
);
2195 extern void sched_dead(struct task_struct
*p
);
2197 extern void proc_caches_init(void);
2198 extern void flush_signals(struct task_struct
*);
2199 extern void __flush_signals(struct task_struct
*);
2200 extern void ignore_signals(struct task_struct
*);
2201 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
2202 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
2204 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
2206 unsigned long flags
;
2209 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
2210 ret
= dequeue_signal(tsk
, mask
, info
);
2211 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
2216 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
2218 extern void unblock_all_signals(void);
2219 extern void release_task(struct task_struct
* p
);
2220 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
2221 extern int force_sigsegv(int, struct task_struct
*);
2222 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
2223 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
2224 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
2225 extern int kill_pid_info_as_cred(int, struct siginfo
*, struct pid
*,
2226 const struct cred
*, u32
);
2227 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
2228 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
2229 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
2230 extern __must_check
bool do_notify_parent(struct task_struct
*, int);
2231 extern void __wake_up_parent(struct task_struct
*p
, struct task_struct
*parent
);
2232 extern void force_sig(int, struct task_struct
*);
2233 extern int send_sig(int, struct task_struct
*, int);
2234 extern int zap_other_threads(struct task_struct
*p
);
2235 extern struct sigqueue
*sigqueue_alloc(void);
2236 extern void sigqueue_free(struct sigqueue
*);
2237 extern int send_sigqueue(struct sigqueue
*, struct task_struct
*, int group
);
2238 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
2239 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
2241 static inline void restore_saved_sigmask(void)
2243 if (test_and_clear_restore_sigmask())
2244 __set_current_blocked(¤t
->saved_sigmask
);
2247 static inline sigset_t
*sigmask_to_save(void)
2249 sigset_t
*res
= ¤t
->blocked
;
2250 if (unlikely(test_restore_sigmask()))
2251 res
= ¤t
->saved_sigmask
;
2255 static inline int kill_cad_pid(int sig
, int priv
)
2257 return kill_pid(cad_pid
, sig
, priv
);
2260 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2261 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2262 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2263 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2266 * True if we are on the alternate signal stack.
2268 static inline int on_sig_stack(unsigned long sp
)
2270 #ifdef CONFIG_STACK_GROWSUP
2271 return sp
>= current
->sas_ss_sp
&&
2272 sp
- current
->sas_ss_sp
< current
->sas_ss_size
;
2274 return sp
> current
->sas_ss_sp
&&
2275 sp
- current
->sas_ss_sp
<= current
->sas_ss_size
;
2279 static inline int sas_ss_flags(unsigned long sp
)
2281 return (current
->sas_ss_size
== 0 ? SS_DISABLE
2282 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
2286 * Routines for handling mm_structs
2288 extern struct mm_struct
* mm_alloc(void);
2290 /* mmdrop drops the mm and the page tables */
2291 extern void __mmdrop(struct mm_struct
*);
2292 static inline void mmdrop(struct mm_struct
* mm
)
2294 if (unlikely(atomic_dec_and_test(&mm
->mm_count
)))
2298 /* mmput gets rid of the mappings and all user-space */
2299 extern void mmput(struct mm_struct
*);
2300 /* Grab a reference to a task's mm, if it is not already going away */
2301 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
2303 * Grab a reference to a task's mm, if it is not already going away
2304 * and ptrace_may_access with the mode parameter passed to it
2307 extern struct mm_struct
*mm_access(struct task_struct
*task
, unsigned int mode
);
2308 /* Remove the current tasks stale references to the old mm_struct */
2309 extern void mm_release(struct task_struct
*, struct mm_struct
*);
2310 /* Allocate a new mm structure and copy contents from tsk->mm */
2311 extern struct mm_struct
*dup_mm(struct task_struct
*tsk
);
2313 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2314 struct task_struct
*, struct pt_regs
*);
2315 extern void flush_thread(void);
2316 extern void exit_thread(void);
2318 extern void exit_files(struct task_struct
*);
2319 extern void __cleanup_sighand(struct sighand_struct
*);
2321 extern void exit_itimers(struct signal_struct
*);
2322 extern void flush_itimer_signals(void);
2324 extern void do_group_exit(int);
2326 extern void daemonize(const char *, ...);
2327 extern int allow_signal(int);
2328 extern int disallow_signal(int);
2330 extern int do_execve(const char *,
2331 const char __user
* const __user
*,
2332 const char __user
* const __user
*, struct pt_regs
*);
2333 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
2334 struct task_struct
*fork_idle(int);
2335 #ifdef CONFIG_GENERIC_KERNEL_THREAD
2336 extern pid_t
kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
);
2339 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
2340 extern char *get_task_comm(char *to
, struct task_struct
*tsk
);
2343 void scheduler_ipi(void);
2344 extern unsigned long wait_task_inactive(struct task_struct
*, long match_state
);
2346 static inline void scheduler_ipi(void) { }
2347 static inline unsigned long wait_task_inactive(struct task_struct
*p
,
2354 #define next_task(p) \
2355 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2357 #define for_each_process(p) \
2358 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2360 extern bool current_is_single_threaded(void);
2363 * Careful: do_each_thread/while_each_thread is a double loop so
2364 * 'break' will not work as expected - use goto instead.
2366 #define do_each_thread(g, t) \
2367 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2369 #define while_each_thread(g, t) \
2370 while ((t = next_thread(t)) != g)
2372 static inline int get_nr_threads(struct task_struct
*tsk
)
2374 return tsk
->signal
->nr_threads
;
2377 static inline bool thread_group_leader(struct task_struct
*p
)
2379 return p
->exit_signal
>= 0;
2382 /* Do to the insanities of de_thread it is possible for a process
2383 * to have the pid of the thread group leader without actually being
2384 * the thread group leader. For iteration through the pids in proc
2385 * all we care about is that we have a task with the appropriate
2386 * pid, we don't actually care if we have the right task.
2388 static inline int has_group_leader_pid(struct task_struct
*p
)
2390 return p
->pid
== p
->tgid
;
2394 int same_thread_group(struct task_struct
*p1
, struct task_struct
*p2
)
2396 return p1
->tgid
== p2
->tgid
;
2399 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
2401 return list_entry_rcu(p
->thread_group
.next
,
2402 struct task_struct
, thread_group
);
2405 static inline int thread_group_empty(struct task_struct
*p
)
2407 return list_empty(&p
->thread_group
);
2410 #define delay_group_leader(p) \
2411 (thread_group_leader(p) && !thread_group_empty(p))
2414 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2415 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2416 * pins the final release of task.io_context. Also protects ->cpuset and
2417 * ->cgroup.subsys[]. And ->vfork_done.
2419 * Nests both inside and outside of read_lock(&tasklist_lock).
2420 * It must not be nested with write_lock_irq(&tasklist_lock),
2421 * neither inside nor outside.
2423 static inline void task_lock(struct task_struct
*p
)
2425 spin_lock(&p
->alloc_lock
);
2428 static inline void task_unlock(struct task_struct
*p
)
2430 spin_unlock(&p
->alloc_lock
);
2433 extern struct sighand_struct
*__lock_task_sighand(struct task_struct
*tsk
,
2434 unsigned long *flags
);
2436 static inline struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
2437 unsigned long *flags
)
2439 struct sighand_struct
*ret
;
2441 ret
= __lock_task_sighand(tsk
, flags
);
2442 (void)__cond_lock(&tsk
->sighand
->siglock
, ret
);
2446 static inline void unlock_task_sighand(struct task_struct
*tsk
,
2447 unsigned long *flags
)
2449 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
2452 #ifdef CONFIG_CGROUPS
2453 static inline void threadgroup_change_begin(struct task_struct
*tsk
)
2455 down_read(&tsk
->signal
->group_rwsem
);
2457 static inline void threadgroup_change_end(struct task_struct
*tsk
)
2459 up_read(&tsk
->signal
->group_rwsem
);
2463 * threadgroup_lock - lock threadgroup
2464 * @tsk: member task of the threadgroup to lock
2466 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2467 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2468 * perform exec. This is useful for cases where the threadgroup needs to
2469 * stay stable across blockable operations.
2471 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2472 * synchronization. While held, no new task will be added to threadgroup
2473 * and no existing live task will have its PF_EXITING set.
2475 * During exec, a task goes and puts its thread group through unusual
2476 * changes. After de-threading, exclusive access is assumed to resources
2477 * which are usually shared by tasks in the same group - e.g. sighand may
2478 * be replaced with a new one. Also, the exec'ing task takes over group
2479 * leader role including its pid. Exclude these changes while locked by
2480 * grabbing cred_guard_mutex which is used to synchronize exec path.
2482 static inline void threadgroup_lock(struct task_struct
*tsk
)
2485 * exec uses exit for de-threading nesting group_rwsem inside
2486 * cred_guard_mutex. Grab cred_guard_mutex first.
2488 mutex_lock(&tsk
->signal
->cred_guard_mutex
);
2489 down_write(&tsk
->signal
->group_rwsem
);
2493 * threadgroup_unlock - unlock threadgroup
2494 * @tsk: member task of the threadgroup to unlock
2496 * Reverse threadgroup_lock().
2498 static inline void threadgroup_unlock(struct task_struct
*tsk
)
2500 up_write(&tsk
->signal
->group_rwsem
);
2501 mutex_unlock(&tsk
->signal
->cred_guard_mutex
);
2504 static inline void threadgroup_change_begin(struct task_struct
*tsk
) {}
2505 static inline void threadgroup_change_end(struct task_struct
*tsk
) {}
2506 static inline void threadgroup_lock(struct task_struct
*tsk
) {}
2507 static inline void threadgroup_unlock(struct task_struct
*tsk
) {}
2510 #ifndef __HAVE_THREAD_FUNCTIONS
2512 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2513 #define task_stack_page(task) ((task)->stack)
2515 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
2517 *task_thread_info(p
) = *task_thread_info(org
);
2518 task_thread_info(p
)->task
= p
;
2521 static inline unsigned long *end_of_stack(struct task_struct
*p
)
2523 return (unsigned long *)(task_thread_info(p
) + 1);
2528 static inline int object_is_on_stack(void *obj
)
2530 void *stack
= task_stack_page(current
);
2532 return (obj
>= stack
) && (obj
< (stack
+ THREAD_SIZE
));
2535 extern void thread_info_cache_init(void);
2537 #ifdef CONFIG_DEBUG_STACK_USAGE
2538 static inline unsigned long stack_not_used(struct task_struct
*p
)
2540 unsigned long *n
= end_of_stack(p
);
2542 do { /* Skip over canary */
2546 return (unsigned long)n
- (unsigned long)end_of_stack(p
);
2550 /* set thread flags in other task's structures
2551 * - see asm/thread_info.h for TIF_xxxx flags available
2553 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2555 set_ti_thread_flag(task_thread_info(tsk
), flag
);
2558 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2560 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2563 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2565 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
2568 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2570 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2573 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2575 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
2578 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
2580 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2583 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
2585 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2588 static inline int test_tsk_need_resched(struct task_struct
*tsk
)
2590 return unlikely(test_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
));
2593 static inline int restart_syscall(void)
2595 set_tsk_thread_flag(current
, TIF_SIGPENDING
);
2596 return -ERESTARTNOINTR
;
2599 static inline int signal_pending(struct task_struct
*p
)
2601 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
2604 static inline int __fatal_signal_pending(struct task_struct
*p
)
2606 return unlikely(sigismember(&p
->pending
.signal
, SIGKILL
));
2609 static inline int fatal_signal_pending(struct task_struct
*p
)
2611 return signal_pending(p
) && __fatal_signal_pending(p
);
2614 static inline int signal_pending_state(long state
, struct task_struct
*p
)
2616 if (!(state
& (TASK_INTERRUPTIBLE
| TASK_WAKEKILL
)))
2618 if (!signal_pending(p
))
2621 return (state
& TASK_INTERRUPTIBLE
) || __fatal_signal_pending(p
);
2624 static inline int need_resched(void)
2626 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
2630 * cond_resched() and cond_resched_lock(): latency reduction via
2631 * explicit rescheduling in places that are safe. The return
2632 * value indicates whether a reschedule was done in fact.
2633 * cond_resched_lock() will drop the spinlock before scheduling,
2634 * cond_resched_softirq() will enable bhs before scheduling.
2636 extern int _cond_resched(void);
2638 #define cond_resched() ({ \
2639 __might_sleep(__FILE__, __LINE__, 0); \
2643 extern int __cond_resched_lock(spinlock_t
*lock
);
2645 #ifdef CONFIG_PREEMPT_COUNT
2646 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2648 #define PREEMPT_LOCK_OFFSET 0
2651 #define cond_resched_lock(lock) ({ \
2652 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2653 __cond_resched_lock(lock); \
2656 extern int __cond_resched_softirq(void);
2658 #define cond_resched_softirq() ({ \
2659 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2660 __cond_resched_softirq(); \
2664 * Does a critical section need to be broken due to another
2665 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2666 * but a general need for low latency)
2668 static inline int spin_needbreak(spinlock_t
*lock
)
2670 #ifdef CONFIG_PREEMPT
2671 return spin_is_contended(lock
);
2678 * Thread group CPU time accounting.
2680 void thread_group_cputime(struct task_struct
*tsk
, struct task_cputime
*times
);
2681 void thread_group_cputimer(struct task_struct
*tsk
, struct task_cputime
*times
);
2683 static inline void thread_group_cputime_init(struct signal_struct
*sig
)
2685 raw_spin_lock_init(&sig
->cputimer
.lock
);
2689 * Reevaluate whether the task has signals pending delivery.
2690 * Wake the task if so.
2691 * This is required every time the blocked sigset_t changes.
2692 * callers must hold sighand->siglock.
2694 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
2695 extern void recalc_sigpending(void);
2697 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
2700 * Wrappers for p->thread_info->cpu access. No-op on UP.
2704 static inline unsigned int task_cpu(const struct task_struct
*p
)
2706 return task_thread_info(p
)->cpu
;
2709 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
2713 static inline unsigned int task_cpu(const struct task_struct
*p
)
2718 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
2722 #endif /* CONFIG_SMP */
2724 extern long sched_setaffinity(pid_t pid
, const struct cpumask
*new_mask
);
2725 extern long sched_getaffinity(pid_t pid
, struct cpumask
*mask
);
2727 extern void normalize_rt_tasks(void);
2729 #ifdef CONFIG_CGROUP_SCHED
2731 extern struct task_group root_task_group
;
2733 extern struct task_group
*sched_create_group(struct task_group
*parent
);
2734 extern void sched_destroy_group(struct task_group
*tg
);
2735 extern void sched_move_task(struct task_struct
*tsk
);
2736 #ifdef CONFIG_FAIR_GROUP_SCHED
2737 extern int sched_group_set_shares(struct task_group
*tg
, unsigned long shares
);
2738 extern unsigned long sched_group_shares(struct task_group
*tg
);
2740 #ifdef CONFIG_RT_GROUP_SCHED
2741 extern int sched_group_set_rt_runtime(struct task_group
*tg
,
2742 long rt_runtime_us
);
2743 extern long sched_group_rt_runtime(struct task_group
*tg
);
2744 extern int sched_group_set_rt_period(struct task_group
*tg
,
2746 extern long sched_group_rt_period(struct task_group
*tg
);
2747 extern int sched_rt_can_attach(struct task_group
*tg
, struct task_struct
*tsk
);
2749 #endif /* CONFIG_CGROUP_SCHED */
2751 extern int task_can_switch_user(struct user_struct
*up
,
2752 struct task_struct
*tsk
);
2754 #ifdef CONFIG_TASK_XACCT
2755 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2757 tsk
->ioac
.rchar
+= amt
;
2760 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2762 tsk
->ioac
.wchar
+= amt
;
2765 static inline void inc_syscr(struct task_struct
*tsk
)
2770 static inline void inc_syscw(struct task_struct
*tsk
)
2775 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2779 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2783 static inline void inc_syscr(struct task_struct
*tsk
)
2787 static inline void inc_syscw(struct task_struct
*tsk
)
2792 #ifndef TASK_SIZE_OF
2793 #define TASK_SIZE_OF(tsk) TASK_SIZE
2796 #ifdef CONFIG_MM_OWNER
2797 extern void mm_update_next_owner(struct mm_struct
*mm
);
2798 extern void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
);
2800 static inline void mm_update_next_owner(struct mm_struct
*mm
)
2804 static inline void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
)
2807 #endif /* CONFIG_MM_OWNER */
2809 static inline unsigned long task_rlimit(const struct task_struct
*tsk
,
2812 return ACCESS_ONCE(tsk
->signal
->rlim
[limit
].rlim_cur
);
2815 static inline unsigned long task_rlimit_max(const struct task_struct
*tsk
,
2818 return ACCESS_ONCE(tsk
->signal
->rlim
[limit
].rlim_max
);
2821 static inline unsigned long rlimit(unsigned int limit
)
2823 return task_rlimit(current
, limit
);
2826 static inline unsigned long rlimit_max(unsigned int limit
)
2828 return task_rlimit_max(current
, limit
);
2831 #endif /* __KERNEL__ */