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 select_nohz_load_balancer(int stop_tick
);
277 extern void set_cpu_sd_state_idle(void);
278 extern int get_nohz_timer_target(void);
280 static inline void select_nohz_load_balancer(int stop_tick
) { }
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
);
411 #define MMF_DUMPABLE 0 /* core dump is permitted */
412 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
414 #define MMF_DUMPABLE_BITS 2
415 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
417 /* coredump filter bits */
418 #define MMF_DUMP_ANON_PRIVATE 2
419 #define MMF_DUMP_ANON_SHARED 3
420 #define MMF_DUMP_MAPPED_PRIVATE 4
421 #define MMF_DUMP_MAPPED_SHARED 5
422 #define MMF_DUMP_ELF_HEADERS 6
423 #define MMF_DUMP_HUGETLB_PRIVATE 7
424 #define MMF_DUMP_HUGETLB_SHARED 8
426 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
427 #define MMF_DUMP_FILTER_BITS 7
428 #define MMF_DUMP_FILTER_MASK \
429 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
430 #define MMF_DUMP_FILTER_DEFAULT \
431 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
432 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
434 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
435 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
437 # define MMF_DUMP_MASK_DEFAULT_ELF 0
439 /* leave room for more dump flags */
440 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
441 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
442 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
444 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
446 struct sighand_struct
{
448 struct k_sigaction action
[_NSIG
];
450 wait_queue_head_t signalfd_wqh
;
453 struct pacct_struct
{
456 unsigned long ac_mem
;
457 cputime_t ac_utime
, ac_stime
;
458 unsigned long ac_minflt
, ac_majflt
;
469 * struct task_cputime - collected CPU time counts
470 * @utime: time spent in user mode, in &cputime_t units
471 * @stime: time spent in kernel mode, in &cputime_t units
472 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
474 * This structure groups together three kinds of CPU time that are
475 * tracked for threads and thread groups. Most things considering
476 * CPU time want to group these counts together and treat all three
477 * of them in parallel.
479 struct task_cputime
{
482 unsigned long long sum_exec_runtime
;
484 /* Alternate field names when used to cache expirations. */
485 #define prof_exp stime
486 #define virt_exp utime
487 #define sched_exp sum_exec_runtime
489 #define INIT_CPUTIME \
490 (struct task_cputime) { \
493 .sum_exec_runtime = 0, \
497 * Disable preemption until the scheduler is running.
498 * Reset by start_kernel()->sched_init()->init_idle().
500 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
501 * before the scheduler is active -- see should_resched().
503 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
506 * struct thread_group_cputimer - thread group interval timer counts
507 * @cputime: thread group interval timers.
508 * @running: non-zero when there are timers running and
509 * @cputime receives updates.
510 * @lock: lock for fields in this struct.
512 * This structure contains the version of task_cputime, above, that is
513 * used for thread group CPU timer calculations.
515 struct thread_group_cputimer
{
516 struct task_cputime cputime
;
521 #include <linux/rwsem.h>
525 * NOTE! "signal_struct" does not have its own
526 * locking, because a shared signal_struct always
527 * implies a shared sighand_struct, so locking
528 * sighand_struct is always a proper superset of
529 * the locking of signal_struct.
531 struct signal_struct
{
536 wait_queue_head_t wait_chldexit
; /* for wait4() */
538 /* current thread group signal load-balancing target: */
539 struct task_struct
*curr_target
;
541 /* shared signal handling: */
542 struct sigpending shared_pending
;
544 /* thread group exit support */
547 * - notify group_exit_task when ->count is equal to notify_count
548 * - everyone except group_exit_task is stopped during signal delivery
549 * of fatal signals, group_exit_task processes the signal.
552 struct task_struct
*group_exit_task
;
554 /* thread group stop support, overloads group_exit_code too */
555 int group_stop_count
;
556 unsigned int flags
; /* see SIGNAL_* flags below */
559 * PR_SET_CHILD_SUBREAPER marks a process, like a service
560 * manager, to re-parent orphan (double-forking) child processes
561 * to this process instead of 'init'. The service manager is
562 * able to receive SIGCHLD signals and is able to investigate
563 * the process until it calls wait(). All children of this
564 * process will inherit a flag if they should look for a
565 * child_subreaper process at exit.
567 unsigned int is_child_subreaper
:1;
568 unsigned int has_child_subreaper
:1;
570 /* POSIX.1b Interval Timers */
571 struct list_head posix_timers
;
573 /* ITIMER_REAL timer for the process */
574 struct hrtimer real_timer
;
575 struct pid
*leader_pid
;
576 ktime_t it_real_incr
;
579 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
580 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
581 * values are defined to 0 and 1 respectively
583 struct cpu_itimer it
[2];
586 * Thread group totals for process CPU timers.
587 * See thread_group_cputimer(), et al, for details.
589 struct thread_group_cputimer cputimer
;
591 /* Earliest-expiration cache. */
592 struct task_cputime cputime_expires
;
594 struct list_head cpu_timers
[3];
596 struct pid
*tty_old_pgrp
;
598 /* boolean value for session group leader */
601 struct tty_struct
*tty
; /* NULL if no tty */
603 #ifdef CONFIG_SCHED_AUTOGROUP
604 struct autogroup
*autogroup
;
607 * Cumulative resource counters for dead threads in the group,
608 * and for reaped dead child processes forked by this group.
609 * Live threads maintain their own counters and add to these
610 * in __exit_signal, except for the group leader.
612 cputime_t utime
, stime
, cutime
, cstime
;
615 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
616 cputime_t prev_utime
, prev_stime
;
618 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
619 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
620 unsigned long inblock
, oublock
, cinblock
, coublock
;
621 unsigned long maxrss
, cmaxrss
;
622 struct task_io_accounting ioac
;
625 * Cumulative ns of schedule CPU time fo dead threads in the
626 * group, not including a zombie group leader, (This only differs
627 * from jiffies_to_ns(utime + stime) if sched_clock uses something
628 * other than jiffies.)
630 unsigned long long sum_sched_runtime
;
633 * We don't bother to synchronize most readers of this at all,
634 * because there is no reader checking a limit that actually needs
635 * to get both rlim_cur and rlim_max atomically, and either one
636 * alone is a single word that can safely be read normally.
637 * getrlimit/setrlimit use task_lock(current->group_leader) to
638 * protect this instead of the siglock, because they really
639 * have no need to disable irqs.
641 struct rlimit rlim
[RLIM_NLIMITS
];
643 #ifdef CONFIG_BSD_PROCESS_ACCT
644 struct pacct_struct pacct
; /* per-process accounting information */
646 #ifdef CONFIG_TASKSTATS
647 struct taskstats
*stats
;
651 struct tty_audit_buf
*tty_audit_buf
;
653 #ifdef CONFIG_CGROUPS
655 * group_rwsem prevents new tasks from entering the threadgroup and
656 * member tasks from exiting,a more specifically, setting of
657 * PF_EXITING. fork and exit paths are protected with this rwsem
658 * using threadgroup_change_begin/end(). Users which require
659 * threadgroup to remain stable should use threadgroup_[un]lock()
660 * which also takes care of exec path. Currently, cgroup is the
663 struct rw_semaphore group_rwsem
;
666 int oom_adj
; /* OOM kill score adjustment (bit shift) */
667 int oom_score_adj
; /* OOM kill score adjustment */
668 int oom_score_adj_min
; /* OOM kill score adjustment minimum value.
669 * Only settable by CAP_SYS_RESOURCE. */
671 struct mutex cred_guard_mutex
; /* guard against foreign influences on
672 * credential calculations
673 * (notably. ptrace) */
676 /* Context switch must be unlocked if interrupts are to be enabled */
677 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
678 # define __ARCH_WANT_UNLOCKED_CTXSW
682 * Bits in flags field of signal_struct.
684 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
685 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
686 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
688 * Pending notifications to parent.
690 #define SIGNAL_CLD_STOPPED 0x00000010
691 #define SIGNAL_CLD_CONTINUED 0x00000020
692 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
694 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
696 /* If true, all threads except ->group_exit_task have pending SIGKILL */
697 static inline int signal_group_exit(const struct signal_struct
*sig
)
699 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
700 (sig
->group_exit_task
!= NULL
);
704 * Some day this will be a full-fledged user tracking system..
707 atomic_t __count
; /* reference count */
708 atomic_t processes
; /* How many processes does this user have? */
709 atomic_t files
; /* How many open files does this user have? */
710 atomic_t sigpending
; /* How many pending signals does this user have? */
711 #ifdef CONFIG_INOTIFY_USER
712 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
713 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
715 #ifdef CONFIG_FANOTIFY
716 atomic_t fanotify_listeners
;
719 atomic_long_t epoll_watches
; /* The number of file descriptors currently watched */
721 #ifdef CONFIG_POSIX_MQUEUE
722 /* protected by mq_lock */
723 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
725 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
728 struct key
*uid_keyring
; /* UID specific keyring */
729 struct key
*session_keyring
; /* UID's default session keyring */
732 /* Hash table maintenance information */
733 struct hlist_node uidhash_node
;
736 #ifdef CONFIG_PERF_EVENTS
737 atomic_long_t locked_vm
;
741 extern int uids_sysfs_init(void);
743 extern struct user_struct
*find_user(kuid_t
);
745 extern struct user_struct root_user
;
746 #define INIT_USER (&root_user)
749 struct backing_dev_info
;
750 struct reclaim_state
;
752 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
754 /* cumulative counters */
755 unsigned long pcount
; /* # of times run on this cpu */
756 unsigned long long run_delay
; /* time spent waiting on a runqueue */
759 unsigned long long last_arrival
,/* when we last ran on a cpu */
760 last_queued
; /* when we were last queued to run */
762 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
764 #ifdef CONFIG_TASK_DELAY_ACCT
765 struct task_delay_info
{
767 unsigned int flags
; /* Private per-task flags */
769 /* For each stat XXX, add following, aligned appropriately
771 * struct timespec XXX_start, XXX_end;
775 * Atomicity of updates to XXX_delay, XXX_count protected by
776 * single lock above (split into XXX_lock if contention is an issue).
780 * XXX_count is incremented on every XXX operation, the delay
781 * associated with the operation is added to XXX_delay.
782 * XXX_delay contains the accumulated delay time in nanoseconds.
784 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
785 u64 blkio_delay
; /* wait for sync block io completion */
786 u64 swapin_delay
; /* wait for swapin block io completion */
787 u32 blkio_count
; /* total count of the number of sync block */
788 /* io operations performed */
789 u32 swapin_count
; /* total count of the number of swapin block */
790 /* io operations performed */
792 struct timespec freepages_start
, freepages_end
;
793 u64 freepages_delay
; /* wait for memory reclaim */
794 u32 freepages_count
; /* total count of memory reclaim */
796 #endif /* CONFIG_TASK_DELAY_ACCT */
798 static inline int sched_info_on(void)
800 #ifdef CONFIG_SCHEDSTATS
802 #elif defined(CONFIG_TASK_DELAY_ACCT)
803 extern int delayacct_on
;
818 * Increase resolution of nice-level calculations for 64-bit architectures.
819 * The extra resolution improves shares distribution and load balancing of
820 * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
821 * hierarchies, especially on larger systems. This is not a user-visible change
822 * and does not change the user-interface for setting shares/weights.
824 * We increase resolution only if we have enough bits to allow this increased
825 * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
826 * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
829 #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */
830 # define SCHED_LOAD_RESOLUTION 10
831 # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION)
832 # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION)
834 # define SCHED_LOAD_RESOLUTION 0
835 # define scale_load(w) (w)
836 # define scale_load_down(w) (w)
839 #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION)
840 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
843 * Increase resolution of cpu_power calculations
845 #define SCHED_POWER_SHIFT 10
846 #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
849 * sched-domains (multiprocessor balancing) declarations:
852 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
853 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
854 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
855 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
856 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
857 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
858 #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */
859 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
860 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
861 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
862 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
863 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
864 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
866 extern int __weak
arch_sd_sibiling_asym_packing(void);
868 struct sched_group_power
{
871 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
874 unsigned int power
, power_orig
;
875 unsigned long next_update
;
877 * Number of busy cpus in this group.
879 atomic_t nr_busy_cpus
;
881 unsigned long cpumask
[0]; /* iteration mask */
885 struct sched_group
*next
; /* Must be a circular list */
888 unsigned int group_weight
;
889 struct sched_group_power
*sgp
;
892 * The CPUs this group covers.
894 * NOTE: this field is variable length. (Allocated dynamically
895 * by attaching extra space to the end of the structure,
896 * depending on how many CPUs the kernel has booted up with)
898 unsigned long cpumask
[0];
901 static inline struct cpumask
*sched_group_cpus(struct sched_group
*sg
)
903 return to_cpumask(sg
->cpumask
);
907 * cpumask masking which cpus in the group are allowed to iterate up the domain
910 static inline struct cpumask
*sched_group_mask(struct sched_group
*sg
)
912 return to_cpumask(sg
->sgp
->cpumask
);
916 * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
917 * @group: The group whose first cpu is to be returned.
919 static inline unsigned int group_first_cpu(struct sched_group
*group
)
921 return cpumask_first(sched_group_cpus(group
));
924 struct sched_domain_attr
{
925 int relax_domain_level
;
928 #define SD_ATTR_INIT (struct sched_domain_attr) { \
929 .relax_domain_level = -1, \
932 extern int sched_domain_level_max
;
934 struct sched_domain
{
935 /* These fields must be setup */
936 struct sched_domain
*parent
; /* top domain must be null terminated */
937 struct sched_domain
*child
; /* bottom domain must be null terminated */
938 struct sched_group
*groups
; /* the balancing groups of the domain */
939 unsigned long min_interval
; /* Minimum balance interval ms */
940 unsigned long max_interval
; /* Maximum balance interval ms */
941 unsigned int busy_factor
; /* less balancing by factor if busy */
942 unsigned int imbalance_pct
; /* No balance until over watermark */
943 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
944 unsigned int busy_idx
;
945 unsigned int idle_idx
;
946 unsigned int newidle_idx
;
947 unsigned int wake_idx
;
948 unsigned int forkexec_idx
;
949 unsigned int smt_gain
;
950 int flags
; /* See SD_* */
953 /* Runtime fields. */
954 unsigned long last_balance
; /* init to jiffies. units in jiffies */
955 unsigned int balance_interval
; /* initialise to 1. units in ms. */
956 unsigned int nr_balance_failed
; /* initialise to 0 */
960 #ifdef CONFIG_SCHEDSTATS
961 /* load_balance() stats */
962 unsigned int lb_count
[CPU_MAX_IDLE_TYPES
];
963 unsigned int lb_failed
[CPU_MAX_IDLE_TYPES
];
964 unsigned int lb_balanced
[CPU_MAX_IDLE_TYPES
];
965 unsigned int lb_imbalance
[CPU_MAX_IDLE_TYPES
];
966 unsigned int lb_gained
[CPU_MAX_IDLE_TYPES
];
967 unsigned int lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
968 unsigned int lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
969 unsigned int lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
971 /* Active load balancing */
972 unsigned int alb_count
;
973 unsigned int alb_failed
;
974 unsigned int alb_pushed
;
976 /* SD_BALANCE_EXEC stats */
977 unsigned int sbe_count
;
978 unsigned int sbe_balanced
;
979 unsigned int sbe_pushed
;
981 /* SD_BALANCE_FORK stats */
982 unsigned int sbf_count
;
983 unsigned int sbf_balanced
;
984 unsigned int sbf_pushed
;
986 /* try_to_wake_up() stats */
987 unsigned int ttwu_wake_remote
;
988 unsigned int ttwu_move_affine
;
989 unsigned int ttwu_move_balance
;
991 #ifdef CONFIG_SCHED_DEBUG
995 void *private; /* used during construction */
996 struct rcu_head rcu
; /* used during destruction */
999 unsigned int span_weight
;
1001 * Span of all CPUs in this domain.
1003 * NOTE: this field is variable length. (Allocated dynamically
1004 * by attaching extra space to the end of the structure,
1005 * depending on how many CPUs the kernel has booted up with)
1007 unsigned long span
[0];
1010 static inline struct cpumask
*sched_domain_span(struct sched_domain
*sd
)
1012 return to_cpumask(sd
->span
);
1015 extern void partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
1016 struct sched_domain_attr
*dattr_new
);
1018 /* Allocate an array of sched domains, for partition_sched_domains(). */
1019 cpumask_var_t
*alloc_sched_domains(unsigned int ndoms
);
1020 void free_sched_domains(cpumask_var_t doms
[], unsigned int ndoms
);
1022 /* Test a flag in parent sched domain */
1023 static inline int test_sd_parent(struct sched_domain
*sd
, int flag
)
1025 if (sd
->parent
&& (sd
->parent
->flags
& flag
))
1031 unsigned long default_scale_freq_power(struct sched_domain
*sd
, int cpu
);
1032 unsigned long default_scale_smt_power(struct sched_domain
*sd
, int cpu
);
1034 bool cpus_share_cache(int this_cpu
, int that_cpu
);
1036 #else /* CONFIG_SMP */
1038 struct sched_domain_attr
;
1041 partition_sched_domains(int ndoms_new
, cpumask_var_t doms_new
[],
1042 struct sched_domain_attr
*dattr_new
)
1046 static inline bool cpus_share_cache(int this_cpu
, int that_cpu
)
1051 #endif /* !CONFIG_SMP */
1054 struct io_context
; /* See blkdev.h */
1057 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1058 extern void prefetch_stack(struct task_struct
*t
);
1060 static inline void prefetch_stack(struct task_struct
*t
) { }
1063 struct audit_context
; /* See audit.c */
1065 struct pipe_inode_info
;
1066 struct uts_namespace
;
1069 struct sched_domain
;
1074 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
1075 #define WF_FORK 0x02 /* child wakeup after fork */
1076 #define WF_MIGRATED 0x04 /* internal use, task got migrated */
1078 #define ENQUEUE_WAKEUP 1
1079 #define ENQUEUE_HEAD 2
1081 #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */
1083 #define ENQUEUE_WAKING 0
1086 #define DEQUEUE_SLEEP 1
1088 struct sched_class
{
1089 const struct sched_class
*next
;
1091 void (*enqueue_task
) (struct rq
*rq
, struct task_struct
*p
, int flags
);
1092 void (*dequeue_task
) (struct rq
*rq
, struct task_struct
*p
, int flags
);
1093 void (*yield_task
) (struct rq
*rq
);
1094 bool (*yield_to_task
) (struct rq
*rq
, struct task_struct
*p
, bool preempt
);
1096 void (*check_preempt_curr
) (struct rq
*rq
, struct task_struct
*p
, int flags
);
1098 struct task_struct
* (*pick_next_task
) (struct rq
*rq
);
1099 void (*put_prev_task
) (struct rq
*rq
, struct task_struct
*p
);
1102 int (*select_task_rq
)(struct task_struct
*p
, int sd_flag
, int flags
);
1104 void (*pre_schedule
) (struct rq
*this_rq
, struct task_struct
*task
);
1105 void (*post_schedule
) (struct rq
*this_rq
);
1106 void (*task_waking
) (struct task_struct
*task
);
1107 void (*task_woken
) (struct rq
*this_rq
, struct task_struct
*task
);
1109 void (*set_cpus_allowed
)(struct task_struct
*p
,
1110 const struct cpumask
*newmask
);
1112 void (*rq_online
)(struct rq
*rq
);
1113 void (*rq_offline
)(struct rq
*rq
);
1116 void (*set_curr_task
) (struct rq
*rq
);
1117 void (*task_tick
) (struct rq
*rq
, struct task_struct
*p
, int queued
);
1118 void (*task_fork
) (struct task_struct
*p
);
1120 void (*switched_from
) (struct rq
*this_rq
, struct task_struct
*task
);
1121 void (*switched_to
) (struct rq
*this_rq
, struct task_struct
*task
);
1122 void (*prio_changed
) (struct rq
*this_rq
, struct task_struct
*task
,
1125 unsigned int (*get_rr_interval
) (struct rq
*rq
,
1126 struct task_struct
*task
);
1128 #ifdef CONFIG_FAIR_GROUP_SCHED
1129 void (*task_move_group
) (struct task_struct
*p
, int on_rq
);
1133 struct load_weight
{
1134 unsigned long weight
, inv_weight
;
1137 #ifdef CONFIG_SCHEDSTATS
1138 struct sched_statistics
{
1148 s64 sum_sleep_runtime
;
1155 u64 nr_migrations_cold
;
1156 u64 nr_failed_migrations_affine
;
1157 u64 nr_failed_migrations_running
;
1158 u64 nr_failed_migrations_hot
;
1159 u64 nr_forced_migrations
;
1162 u64 nr_wakeups_sync
;
1163 u64 nr_wakeups_migrate
;
1164 u64 nr_wakeups_local
;
1165 u64 nr_wakeups_remote
;
1166 u64 nr_wakeups_affine
;
1167 u64 nr_wakeups_affine_attempts
;
1168 u64 nr_wakeups_passive
;
1169 u64 nr_wakeups_idle
;
1173 struct sched_entity
{
1174 struct load_weight load
; /* for load-balancing */
1175 struct rb_node run_node
;
1176 struct list_head group_node
;
1180 u64 sum_exec_runtime
;
1182 u64 prev_sum_exec_runtime
;
1186 #ifdef CONFIG_SCHEDSTATS
1187 struct sched_statistics statistics
;
1190 #ifdef CONFIG_FAIR_GROUP_SCHED
1191 struct sched_entity
*parent
;
1192 /* rq on which this entity is (to be) queued: */
1193 struct cfs_rq
*cfs_rq
;
1194 /* rq "owned" by this entity/group: */
1195 struct cfs_rq
*my_q
;
1199 struct sched_rt_entity
{
1200 struct list_head run_list
;
1201 unsigned long timeout
;
1202 unsigned int time_slice
;
1204 struct sched_rt_entity
*back
;
1205 #ifdef CONFIG_RT_GROUP_SCHED
1206 struct sched_rt_entity
*parent
;
1207 /* rq on which this entity is (to be) queued: */
1208 struct rt_rq
*rt_rq
;
1209 /* rq "owned" by this entity/group: */
1215 * default timeslice is 100 msecs (used only for SCHED_RR tasks).
1216 * Timeslices get refilled after they expire.
1218 #define RR_TIMESLICE (100 * HZ / 1000)
1222 enum perf_event_task_context
{
1223 perf_invalid_context
= -1,
1224 perf_hw_context
= 0,
1226 perf_nr_task_contexts
,
1229 struct task_struct
{
1230 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
1233 unsigned int flags
; /* per process flags, defined below */
1234 unsigned int ptrace
;
1237 struct llist_node wake_entry
;
1242 int prio
, static_prio
, normal_prio
;
1243 unsigned int rt_priority
;
1244 const struct sched_class
*sched_class
;
1245 struct sched_entity se
;
1246 struct sched_rt_entity rt
;
1248 #ifdef CONFIG_PREEMPT_NOTIFIERS
1249 /* list of struct preempt_notifier: */
1250 struct hlist_head preempt_notifiers
;
1254 * fpu_counter contains the number of consecutive context switches
1255 * that the FPU is used. If this is over a threshold, the lazy fpu
1256 * saving becomes unlazy to save the trap. This is an unsigned char
1257 * so that after 256 times the counter wraps and the behavior turns
1258 * lazy again; this to deal with bursty apps that only use FPU for
1261 unsigned char fpu_counter
;
1262 #ifdef CONFIG_BLK_DEV_IO_TRACE
1263 unsigned int btrace_seq
;
1266 unsigned int policy
;
1267 int nr_cpus_allowed
;
1268 cpumask_t cpus_allowed
;
1270 #ifdef CONFIG_PREEMPT_RCU
1271 int rcu_read_lock_nesting
;
1272 char rcu_read_unlock_special
;
1273 struct list_head rcu_node_entry
;
1274 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1275 #ifdef CONFIG_TREE_PREEMPT_RCU
1276 struct rcu_node
*rcu_blocked_node
;
1277 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1278 #ifdef CONFIG_RCU_BOOST
1279 struct rt_mutex
*rcu_boost_mutex
;
1280 #endif /* #ifdef CONFIG_RCU_BOOST */
1282 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1283 struct sched_info sched_info
;
1286 struct list_head tasks
;
1288 struct plist_node pushable_tasks
;
1291 struct mm_struct
*mm
, *active_mm
;
1292 #ifdef CONFIG_COMPAT_BRK
1293 unsigned brk_randomized
:1;
1295 #if defined(SPLIT_RSS_COUNTING)
1296 struct task_rss_stat rss_stat
;
1300 int exit_code
, exit_signal
;
1301 int pdeath_signal
; /* The signal sent when the parent dies */
1302 unsigned int jobctl
; /* JOBCTL_*, siglock protected */
1304 unsigned int personality
;
1305 unsigned did_exec
:1;
1306 unsigned in_execve
:1; /* Tell the LSMs that the process is doing an
1308 unsigned in_iowait
:1;
1310 /* task may not gain privileges */
1311 unsigned no_new_privs
:1;
1313 /* Revert to default priority/policy when forking */
1314 unsigned sched_reset_on_fork
:1;
1315 unsigned sched_contributes_to_load
:1;
1320 #ifdef CONFIG_CC_STACKPROTECTOR
1321 /* Canary value for the -fstack-protector gcc feature */
1322 unsigned long stack_canary
;
1325 * pointers to (original) parent process, youngest child, younger sibling,
1326 * older sibling, respectively. (p->father can be replaced with
1327 * p->real_parent->pid)
1329 struct task_struct __rcu
*real_parent
; /* real parent process */
1330 struct task_struct __rcu
*parent
; /* recipient of SIGCHLD, wait4() reports */
1332 * children/sibling forms the list of my natural children
1334 struct list_head children
; /* list of my children */
1335 struct list_head sibling
; /* linkage in my parent's children list */
1336 struct task_struct
*group_leader
; /* threadgroup leader */
1339 * ptraced is the list of tasks this task is using ptrace on.
1340 * This includes both natural children and PTRACE_ATTACH targets.
1341 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1343 struct list_head ptraced
;
1344 struct list_head ptrace_entry
;
1346 /* PID/PID hash table linkage. */
1347 struct pid_link pids
[PIDTYPE_MAX
];
1348 struct list_head thread_group
;
1350 struct completion
*vfork_done
; /* for vfork() */
1351 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
1352 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
1354 cputime_t utime
, stime
, utimescaled
, stimescaled
;
1356 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
1357 cputime_t prev_utime
, prev_stime
;
1359 unsigned long nvcsw
, nivcsw
; /* context switch counts */
1360 struct timespec start_time
; /* monotonic time */
1361 struct timespec real_start_time
; /* boot based time */
1362 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1363 unsigned long min_flt
, maj_flt
;
1365 struct task_cputime cputime_expires
;
1366 struct list_head cpu_timers
[3];
1368 /* process credentials */
1369 const struct cred __rcu
*real_cred
; /* objective and real subjective task
1370 * credentials (COW) */
1371 const struct cred __rcu
*cred
; /* effective (overridable) subjective task
1372 * credentials (COW) */
1373 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
1374 - access with [gs]et_task_comm (which lock
1375 it with task_lock())
1376 - initialized normally by setup_new_exec */
1377 /* file system info */
1378 int link_count
, total_link_count
;
1379 #ifdef CONFIG_SYSVIPC
1381 struct sysv_sem sysvsem
;
1383 #ifdef CONFIG_DETECT_HUNG_TASK
1384 /* hung task detection */
1385 unsigned long last_switch_count
;
1387 /* CPU-specific state of this task */
1388 struct thread_struct thread
;
1389 /* filesystem information */
1390 struct fs_struct
*fs
;
1391 /* open file information */
1392 struct files_struct
*files
;
1394 struct nsproxy
*nsproxy
;
1395 /* signal handlers */
1396 struct signal_struct
*signal
;
1397 struct sighand_struct
*sighand
;
1399 sigset_t blocked
, real_blocked
;
1400 sigset_t saved_sigmask
; /* restored if set_restore_sigmask() was used */
1401 struct sigpending pending
;
1403 unsigned long sas_ss_sp
;
1405 int (*notifier
)(void *priv
);
1406 void *notifier_data
;
1407 sigset_t
*notifier_mask
;
1408 struct hlist_head task_works
;
1410 struct audit_context
*audit_context
;
1411 #ifdef CONFIG_AUDITSYSCALL
1413 unsigned int sessionid
;
1415 struct seccomp seccomp
;
1417 /* Thread group tracking */
1420 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1422 spinlock_t alloc_lock
;
1424 /* Protection of the PI data structures: */
1425 raw_spinlock_t pi_lock
;
1427 #ifdef CONFIG_RT_MUTEXES
1428 /* PI waiters blocked on a rt_mutex held by this task */
1429 struct plist_head pi_waiters
;
1430 /* Deadlock detection and priority inheritance handling */
1431 struct rt_mutex_waiter
*pi_blocked_on
;
1434 #ifdef CONFIG_DEBUG_MUTEXES
1435 /* mutex deadlock detection */
1436 struct mutex_waiter
*blocked_on
;
1438 #ifdef CONFIG_TRACE_IRQFLAGS
1439 unsigned int irq_events
;
1440 unsigned long hardirq_enable_ip
;
1441 unsigned long hardirq_disable_ip
;
1442 unsigned int hardirq_enable_event
;
1443 unsigned int hardirq_disable_event
;
1444 int hardirqs_enabled
;
1445 int hardirq_context
;
1446 unsigned long softirq_disable_ip
;
1447 unsigned long softirq_enable_ip
;
1448 unsigned int softirq_disable_event
;
1449 unsigned int softirq_enable_event
;
1450 int softirqs_enabled
;
1451 int softirq_context
;
1453 #ifdef CONFIG_LOCKDEP
1454 # define MAX_LOCK_DEPTH 48UL
1457 unsigned int lockdep_recursion
;
1458 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1459 gfp_t lockdep_reclaim_gfp
;
1462 /* journalling filesystem info */
1465 /* stacked block device info */
1466 struct bio_list
*bio_list
;
1469 /* stack plugging */
1470 struct blk_plug
*plug
;
1474 struct reclaim_state
*reclaim_state
;
1476 struct backing_dev_info
*backing_dev_info
;
1478 struct io_context
*io_context
;
1480 unsigned long ptrace_message
;
1481 siginfo_t
*last_siginfo
; /* For ptrace use. */
1482 struct task_io_accounting ioac
;
1483 #if defined(CONFIG_TASK_XACCT)
1484 u64 acct_rss_mem1
; /* accumulated rss usage */
1485 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1486 cputime_t acct_timexpd
; /* stime + utime since last update */
1488 #ifdef CONFIG_CPUSETS
1489 nodemask_t mems_allowed
; /* Protected by alloc_lock */
1490 seqcount_t mems_allowed_seq
; /* Seqence no to catch updates */
1491 int cpuset_mem_spread_rotor
;
1492 int cpuset_slab_spread_rotor
;
1494 #ifdef CONFIG_CGROUPS
1495 /* Control Group info protected by css_set_lock */
1496 struct css_set __rcu
*cgroups
;
1497 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1498 struct list_head cg_list
;
1501 struct robust_list_head __user
*robust_list
;
1502 #ifdef CONFIG_COMPAT
1503 struct compat_robust_list_head __user
*compat_robust_list
;
1505 struct list_head pi_state_list
;
1506 struct futex_pi_state
*pi_state_cache
;
1508 #ifdef CONFIG_PERF_EVENTS
1509 struct perf_event_context
*perf_event_ctxp
[perf_nr_task_contexts
];
1510 struct mutex perf_event_mutex
;
1511 struct list_head perf_event_list
;
1514 struct mempolicy
*mempolicy
; /* Protected by alloc_lock */
1516 short pref_node_fork
;
1518 struct rcu_head rcu
;
1521 * cache last used pipe for splice
1523 struct pipe_inode_info
*splice_pipe
;
1524 #ifdef CONFIG_TASK_DELAY_ACCT
1525 struct task_delay_info
*delays
;
1527 #ifdef CONFIG_FAULT_INJECTION
1531 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1532 * balance_dirty_pages() for some dirty throttling pause
1535 int nr_dirtied_pause
;
1536 unsigned long dirty_paused_when
; /* start of a write-and-pause period */
1538 #ifdef CONFIG_LATENCYTOP
1539 int latency_record_count
;
1540 struct latency_record latency_record
[LT_SAVECOUNT
];
1543 * time slack values; these are used to round up poll() and
1544 * select() etc timeout values. These are in nanoseconds.
1546 unsigned long timer_slack_ns
;
1547 unsigned long default_timer_slack_ns
;
1549 struct list_head
*scm_work_list
;
1550 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1551 /* Index of current stored address in ret_stack */
1553 /* Stack of return addresses for return function tracing */
1554 struct ftrace_ret_stack
*ret_stack
;
1555 /* time stamp for last schedule */
1556 unsigned long long ftrace_timestamp
;
1558 * Number of functions that haven't been traced
1559 * because of depth overrun.
1561 atomic_t trace_overrun
;
1562 /* Pause for the tracing */
1563 atomic_t tracing_graph_pause
;
1565 #ifdef CONFIG_TRACING
1566 /* state flags for use by tracers */
1567 unsigned long trace
;
1568 /* bitmask and counter of trace recursion */
1569 unsigned long trace_recursion
;
1570 #endif /* CONFIG_TRACING */
1571 #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
1572 struct memcg_batch_info
{
1573 int do_batch
; /* incremented when batch uncharge started */
1574 struct mem_cgroup
*memcg
; /* target memcg of uncharge */
1575 unsigned long nr_pages
; /* uncharged usage */
1576 unsigned long memsw_nr_pages
; /* uncharged mem+swap usage */
1579 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1580 atomic_t ptrace_bp_refcnt
;
1582 #ifdef CONFIG_UPROBES
1583 struct uprobe_task
*utask
;
1588 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1589 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1592 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1593 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1594 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1595 * values are inverted: lower p->prio value means higher priority.
1597 * The MAX_USER_RT_PRIO value allows the actual maximum
1598 * RT priority to be separate from the value exported to
1599 * user-space. This allows kernel threads to set their
1600 * priority to a value higher than any user task. Note:
1601 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1604 #define MAX_USER_RT_PRIO 100
1605 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1607 #define MAX_PRIO (MAX_RT_PRIO + 40)
1608 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1610 static inline int rt_prio(int prio
)
1612 if (unlikely(prio
< MAX_RT_PRIO
))
1617 static inline int rt_task(struct task_struct
*p
)
1619 return rt_prio(p
->prio
);
1622 static inline struct pid
*task_pid(struct task_struct
*task
)
1624 return task
->pids
[PIDTYPE_PID
].pid
;
1627 static inline struct pid
*task_tgid(struct task_struct
*task
)
1629 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1633 * Without tasklist or rcu lock it is not safe to dereference
1634 * the result of task_pgrp/task_session even if task == current,
1635 * we can race with another thread doing sys_setsid/sys_setpgid.
1637 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1639 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1642 static inline struct pid
*task_session(struct task_struct
*task
)
1644 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1647 struct pid_namespace
;
1650 * the helpers to get the task's different pids as they are seen
1651 * from various namespaces
1653 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1654 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1656 * task_xid_nr_ns() : id seen from the ns specified;
1658 * set_task_vxid() : assigns a virtual id to a task;
1660 * see also pid_nr() etc in include/linux/pid.h
1662 pid_t
__task_pid_nr_ns(struct task_struct
*task
, enum pid_type type
,
1663 struct pid_namespace
*ns
);
1665 static inline pid_t
task_pid_nr(struct task_struct
*tsk
)
1670 static inline pid_t
task_pid_nr_ns(struct task_struct
*tsk
,
1671 struct pid_namespace
*ns
)
1673 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, ns
);
1676 static inline pid_t
task_pid_vnr(struct task_struct
*tsk
)
1678 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, NULL
);
1682 static inline pid_t
task_tgid_nr(struct task_struct
*tsk
)
1687 pid_t
task_tgid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1689 static inline pid_t
task_tgid_vnr(struct task_struct
*tsk
)
1691 return pid_vnr(task_tgid(tsk
));
1695 static inline pid_t
task_pgrp_nr_ns(struct task_struct
*tsk
,
1696 struct pid_namespace
*ns
)
1698 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, ns
);
1701 static inline pid_t
task_pgrp_vnr(struct task_struct
*tsk
)
1703 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, NULL
);
1707 static inline pid_t
task_session_nr_ns(struct task_struct
*tsk
,
1708 struct pid_namespace
*ns
)
1710 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, ns
);
1713 static inline pid_t
task_session_vnr(struct task_struct
*tsk
)
1715 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, NULL
);
1718 /* obsolete, do not use */
1719 static inline pid_t
task_pgrp_nr(struct task_struct
*tsk
)
1721 return task_pgrp_nr_ns(tsk
, &init_pid_ns
);
1725 * pid_alive - check that a task structure is not stale
1726 * @p: Task structure to be checked.
1728 * Test if a process is not yet dead (at most zombie state)
1729 * If pid_alive fails, then pointers within the task structure
1730 * can be stale and must not be dereferenced.
1732 static inline int pid_alive(struct task_struct
*p
)
1734 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1738 * is_global_init - check if a task structure is init
1739 * @tsk: Task structure to be checked.
1741 * Check if a task structure is the first user space task the kernel created.
1743 static inline int is_global_init(struct task_struct
*tsk
)
1745 return tsk
->pid
== 1;
1749 * is_container_init:
1750 * check whether in the task is init in its own pid namespace.
1752 extern int is_container_init(struct task_struct
*tsk
);
1754 extern struct pid
*cad_pid
;
1756 extern void free_task(struct task_struct
*tsk
);
1757 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1759 extern void __put_task_struct(struct task_struct
*t
);
1761 static inline void put_task_struct(struct task_struct
*t
)
1763 if (atomic_dec_and_test(&t
->usage
))
1764 __put_task_struct(t
);
1767 extern void task_times(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
1768 extern void thread_group_times(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
);
1773 #define PF_EXITING 0x00000004 /* getting shut down */
1774 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1775 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1776 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1777 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1778 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1779 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1780 #define PF_DUMPCORE 0x00000200 /* dumped core */
1781 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1782 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1783 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1784 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1785 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1786 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1787 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1788 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1789 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1790 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1791 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1792 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1793 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1794 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1795 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1796 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1797 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1798 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1799 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1802 * Only the _current_ task can read/write to tsk->flags, but other
1803 * tasks can access tsk->flags in readonly mode for example
1804 * with tsk_used_math (like during threaded core dumping).
1805 * There is however an exception to this rule during ptrace
1806 * or during fork: the ptracer task is allowed to write to the
1807 * child->flags of its traced child (same goes for fork, the parent
1808 * can write to the child->flags), because we're guaranteed the
1809 * child is not running and in turn not changing child->flags
1810 * at the same time the parent does it.
1812 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1813 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1814 #define clear_used_math() clear_stopped_child_used_math(current)
1815 #define set_used_math() set_stopped_child_used_math(current)
1816 #define conditional_stopped_child_used_math(condition, child) \
1817 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1818 #define conditional_used_math(condition) \
1819 conditional_stopped_child_used_math(condition, current)
1820 #define copy_to_stopped_child_used_math(child) \
1821 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1822 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1823 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1824 #define used_math() tsk_used_math(current)
1827 * task->jobctl flags
1829 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1831 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1832 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1833 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1834 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1835 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1836 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1837 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1839 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1840 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
1841 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
1842 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
1843 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
1844 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
1845 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
1847 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1848 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
1850 extern bool task_set_jobctl_pending(struct task_struct
*task
,
1852 extern void task_clear_jobctl_trapping(struct task_struct
*task
);
1853 extern void task_clear_jobctl_pending(struct task_struct
*task
,
1856 #ifdef CONFIG_PREEMPT_RCU
1858 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1859 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1861 static inline void rcu_copy_process(struct task_struct
*p
)
1863 p
->rcu_read_lock_nesting
= 0;
1864 p
->rcu_read_unlock_special
= 0;
1865 #ifdef CONFIG_TREE_PREEMPT_RCU
1866 p
->rcu_blocked_node
= NULL
;
1867 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1868 #ifdef CONFIG_RCU_BOOST
1869 p
->rcu_boost_mutex
= NULL
;
1870 #endif /* #ifdef CONFIG_RCU_BOOST */
1871 INIT_LIST_HEAD(&p
->rcu_node_entry
);
1874 static inline void rcu_switch_from(struct task_struct
*prev
)
1876 if (prev
->rcu_read_lock_nesting
!= 0)
1877 rcu_preempt_note_context_switch();
1882 static inline void rcu_copy_process(struct task_struct
*p
)
1886 static inline void rcu_switch_from(struct task_struct
*prev
)
1893 extern void do_set_cpus_allowed(struct task_struct
*p
,
1894 const struct cpumask
*new_mask
);
1896 extern int set_cpus_allowed_ptr(struct task_struct
*p
,
1897 const struct cpumask
*new_mask
);
1899 static inline void do_set_cpus_allowed(struct task_struct
*p
,
1900 const struct cpumask
*new_mask
)
1903 static inline int set_cpus_allowed_ptr(struct task_struct
*p
,
1904 const struct cpumask
*new_mask
)
1906 if (!cpumask_test_cpu(0, new_mask
))
1912 #ifndef CONFIG_CPUMASK_OFFSTACK
1913 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1915 return set_cpus_allowed_ptr(p
, &new_mask
);
1920 * Do not use outside of architecture code which knows its limitations.
1922 * sched_clock() has no promise of monotonicity or bounded drift between
1923 * CPUs, use (which you should not) requires disabling IRQs.
1925 * Please use one of the three interfaces below.
1927 extern unsigned long long notrace
sched_clock(void);
1929 * See the comment in kernel/sched/clock.c
1931 extern u64
cpu_clock(int cpu
);
1932 extern u64
local_clock(void);
1933 extern u64
sched_clock_cpu(int cpu
);
1936 extern void sched_clock_init(void);
1938 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1939 static inline void sched_clock_tick(void)
1943 static inline void sched_clock_idle_sleep_event(void)
1947 static inline void sched_clock_idle_wakeup_event(u64 delta_ns
)
1952 * Architectures can set this to 1 if they have specified
1953 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1954 * but then during bootup it turns out that sched_clock()
1955 * is reliable after all:
1957 extern int sched_clock_stable
;
1959 extern void sched_clock_tick(void);
1960 extern void sched_clock_idle_sleep_event(void);
1961 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1964 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1966 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1967 * The reason for this explicit opt-in is not to have perf penalty with
1968 * slow sched_clocks.
1970 extern void enable_sched_clock_irqtime(void);
1971 extern void disable_sched_clock_irqtime(void);
1973 static inline void enable_sched_clock_irqtime(void) {}
1974 static inline void disable_sched_clock_irqtime(void) {}
1977 extern unsigned long long
1978 task_sched_runtime(struct task_struct
*task
);
1980 /* sched_exec is called by processes performing an exec */
1982 extern void sched_exec(void);
1984 #define sched_exec() {}
1987 extern void sched_clock_idle_sleep_event(void);
1988 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1990 #ifdef CONFIG_HOTPLUG_CPU
1991 extern void idle_task_exit(void);
1993 static inline void idle_task_exit(void) {}
1996 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1997 extern void wake_up_idle_cpu(int cpu
);
1999 static inline void wake_up_idle_cpu(int cpu
) { }
2002 extern unsigned int sysctl_sched_latency
;
2003 extern unsigned int sysctl_sched_min_granularity
;
2004 extern unsigned int sysctl_sched_wakeup_granularity
;
2005 extern unsigned int sysctl_sched_child_runs_first
;
2007 enum sched_tunable_scaling
{
2008 SCHED_TUNABLESCALING_NONE
,
2009 SCHED_TUNABLESCALING_LOG
,
2010 SCHED_TUNABLESCALING_LINEAR
,
2011 SCHED_TUNABLESCALING_END
,
2013 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling
;
2015 #ifdef CONFIG_SCHED_DEBUG
2016 extern unsigned int sysctl_sched_migration_cost
;
2017 extern unsigned int sysctl_sched_nr_migrate
;
2018 extern unsigned int sysctl_sched_time_avg
;
2019 extern unsigned int sysctl_timer_migration
;
2020 extern unsigned int sysctl_sched_shares_window
;
2022 int sched_proc_update_handler(struct ctl_table
*table
, int write
,
2023 void __user
*buffer
, size_t *length
,
2026 #ifdef CONFIG_SCHED_DEBUG
2027 static inline unsigned int get_sysctl_timer_migration(void)
2029 return sysctl_timer_migration
;
2032 static inline unsigned int get_sysctl_timer_migration(void)
2037 extern unsigned int sysctl_sched_rt_period
;
2038 extern int sysctl_sched_rt_runtime
;
2040 int sched_rt_handler(struct ctl_table
*table
, int write
,
2041 void __user
*buffer
, size_t *lenp
,
2044 #ifdef CONFIG_SCHED_AUTOGROUP
2045 extern unsigned int sysctl_sched_autogroup_enabled
;
2047 extern void sched_autogroup_create_attach(struct task_struct
*p
);
2048 extern void sched_autogroup_detach(struct task_struct
*p
);
2049 extern void sched_autogroup_fork(struct signal_struct
*sig
);
2050 extern void sched_autogroup_exit(struct signal_struct
*sig
);
2051 #ifdef CONFIG_PROC_FS
2052 extern void proc_sched_autogroup_show_task(struct task_struct
*p
, struct seq_file
*m
);
2053 extern int proc_sched_autogroup_set_nice(struct task_struct
*p
, int nice
);
2056 static inline void sched_autogroup_create_attach(struct task_struct
*p
) { }
2057 static inline void sched_autogroup_detach(struct task_struct
*p
) { }
2058 static inline void sched_autogroup_fork(struct signal_struct
*sig
) { }
2059 static inline void sched_autogroup_exit(struct signal_struct
*sig
) { }
2062 #ifdef CONFIG_CFS_BANDWIDTH
2063 extern unsigned int sysctl_sched_cfs_bandwidth_slice
;
2066 #ifdef CONFIG_RT_MUTEXES
2067 extern int rt_mutex_getprio(struct task_struct
*p
);
2068 extern void rt_mutex_setprio(struct task_struct
*p
, int prio
);
2069 extern void rt_mutex_adjust_pi(struct task_struct
*p
);
2070 static inline bool tsk_is_pi_blocked(struct task_struct
*tsk
)
2072 return tsk
->pi_blocked_on
!= NULL
;
2075 static inline int rt_mutex_getprio(struct task_struct
*p
)
2077 return p
->normal_prio
;
2079 # define rt_mutex_adjust_pi(p) do { } while (0)
2080 static inline bool tsk_is_pi_blocked(struct task_struct
*tsk
)
2086 extern bool yield_to(struct task_struct
*p
, bool preempt
);
2087 extern void set_user_nice(struct task_struct
*p
, long nice
);
2088 extern int task_prio(const struct task_struct
*p
);
2089 extern int task_nice(const struct task_struct
*p
);
2090 extern int can_nice(const struct task_struct
*p
, const int nice
);
2091 extern int task_curr(const struct task_struct
*p
);
2092 extern int idle_cpu(int cpu
);
2093 extern int sched_setscheduler(struct task_struct
*, int,
2094 const struct sched_param
*);
2095 extern int sched_setscheduler_nocheck(struct task_struct
*, int,
2096 const struct sched_param
*);
2097 extern struct task_struct
*idle_task(int cpu
);
2099 * is_idle_task - is the specified task an idle task?
2100 * @p: the task in question.
2102 static inline bool is_idle_task(const struct task_struct
*p
)
2106 extern struct task_struct
*curr_task(int cpu
);
2107 extern void set_curr_task(int cpu
, struct task_struct
*p
);
2112 * The default (Linux) execution domain.
2114 extern struct exec_domain default_exec_domain
;
2116 union thread_union
{
2117 struct thread_info thread_info
;
2118 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
2121 #ifndef __HAVE_ARCH_KSTACK_END
2122 static inline int kstack_end(void *addr
)
2124 /* Reliable end of stack detection:
2125 * Some APM bios versions misalign the stack
2127 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
2131 extern union thread_union init_thread_union
;
2132 extern struct task_struct init_task
;
2134 extern struct mm_struct init_mm
;
2136 extern struct pid_namespace init_pid_ns
;
2139 * find a task by one of its numerical ids
2141 * find_task_by_pid_ns():
2142 * finds a task by its pid in the specified namespace
2143 * find_task_by_vpid():
2144 * finds a task by its virtual pid
2146 * see also find_vpid() etc in include/linux/pid.h
2149 extern struct task_struct
*find_task_by_vpid(pid_t nr
);
2150 extern struct task_struct
*find_task_by_pid_ns(pid_t nr
,
2151 struct pid_namespace
*ns
);
2153 extern void __set_special_pids(struct pid
*pid
);
2155 /* per-UID process charging. */
2156 extern struct user_struct
* alloc_uid(kuid_t
);
2157 static inline struct user_struct
*get_uid(struct user_struct
*u
)
2159 atomic_inc(&u
->__count
);
2162 extern void free_uid(struct user_struct
*);
2164 #include <asm/current.h>
2166 extern void xtime_update(unsigned long ticks
);
2168 extern int wake_up_state(struct task_struct
*tsk
, unsigned int state
);
2169 extern int wake_up_process(struct task_struct
*tsk
);
2170 extern void wake_up_new_task(struct task_struct
*tsk
);
2172 extern void kick_process(struct task_struct
*tsk
);
2174 static inline void kick_process(struct task_struct
*tsk
) { }
2176 extern void sched_fork(struct task_struct
*p
);
2177 extern void sched_dead(struct task_struct
*p
);
2179 extern void proc_caches_init(void);
2180 extern void flush_signals(struct task_struct
*);
2181 extern void __flush_signals(struct task_struct
*);
2182 extern void ignore_signals(struct task_struct
*);
2183 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
2184 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
2186 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
2188 unsigned long flags
;
2191 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
2192 ret
= dequeue_signal(tsk
, mask
, info
);
2193 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
2198 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
2200 extern void unblock_all_signals(void);
2201 extern void release_task(struct task_struct
* p
);
2202 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
2203 extern int force_sigsegv(int, struct task_struct
*);
2204 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
2205 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
2206 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
2207 extern int kill_pid_info_as_cred(int, struct siginfo
*, struct pid
*,
2208 const struct cred
*, u32
);
2209 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
2210 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
2211 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
2212 extern __must_check
bool do_notify_parent(struct task_struct
*, int);
2213 extern void __wake_up_parent(struct task_struct
*p
, struct task_struct
*parent
);
2214 extern void force_sig(int, struct task_struct
*);
2215 extern int send_sig(int, struct task_struct
*, int);
2216 extern int zap_other_threads(struct task_struct
*p
);
2217 extern struct sigqueue
*sigqueue_alloc(void);
2218 extern void sigqueue_free(struct sigqueue
*);
2219 extern int send_sigqueue(struct sigqueue
*, struct task_struct
*, int group
);
2220 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
2221 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
2223 static inline void restore_saved_sigmask(void)
2225 if (test_and_clear_restore_sigmask())
2226 __set_current_blocked(¤t
->saved_sigmask
);
2229 static inline sigset_t
*sigmask_to_save(void)
2231 sigset_t
*res
= ¤t
->blocked
;
2232 if (unlikely(test_restore_sigmask()))
2233 res
= ¤t
->saved_sigmask
;
2237 static inline int kill_cad_pid(int sig
, int priv
)
2239 return kill_pid(cad_pid
, sig
, priv
);
2242 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2243 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2244 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2245 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2248 * True if we are on the alternate signal stack.
2250 static inline int on_sig_stack(unsigned long sp
)
2252 #ifdef CONFIG_STACK_GROWSUP
2253 return sp
>= current
->sas_ss_sp
&&
2254 sp
- current
->sas_ss_sp
< current
->sas_ss_size
;
2256 return sp
> current
->sas_ss_sp
&&
2257 sp
- current
->sas_ss_sp
<= current
->sas_ss_size
;
2261 static inline int sas_ss_flags(unsigned long sp
)
2263 return (current
->sas_ss_size
== 0 ? SS_DISABLE
2264 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
2268 * Routines for handling mm_structs
2270 extern struct mm_struct
* mm_alloc(void);
2272 /* mmdrop drops the mm and the page tables */
2273 extern void __mmdrop(struct mm_struct
*);
2274 static inline void mmdrop(struct mm_struct
* mm
)
2276 if (unlikely(atomic_dec_and_test(&mm
->mm_count
)))
2280 /* mmput gets rid of the mappings and all user-space */
2281 extern void mmput(struct mm_struct
*);
2282 /* Grab a reference to a task's mm, if it is not already going away */
2283 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
2285 * Grab a reference to a task's mm, if it is not already going away
2286 * and ptrace_may_access with the mode parameter passed to it
2289 extern struct mm_struct
*mm_access(struct task_struct
*task
, unsigned int mode
);
2290 /* Remove the current tasks stale references to the old mm_struct */
2291 extern void mm_release(struct task_struct
*, struct mm_struct
*);
2292 /* Allocate a new mm structure and copy contents from tsk->mm */
2293 extern struct mm_struct
*dup_mm(struct task_struct
*tsk
);
2295 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2296 struct task_struct
*, struct pt_regs
*);
2297 extern void flush_thread(void);
2298 extern void exit_thread(void);
2300 extern void exit_files(struct task_struct
*);
2301 extern void __cleanup_sighand(struct sighand_struct
*);
2303 extern void exit_itimers(struct signal_struct
*);
2304 extern void flush_itimer_signals(void);
2306 extern void do_group_exit(int);
2308 extern void daemonize(const char *, ...);
2309 extern int allow_signal(int);
2310 extern int disallow_signal(int);
2312 extern int do_execve(const char *,
2313 const char __user
* const __user
*,
2314 const char __user
* const __user
*, struct pt_regs
*);
2315 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
2316 struct task_struct
*fork_idle(int);
2318 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
2319 extern char *get_task_comm(char *to
, struct task_struct
*tsk
);
2322 void scheduler_ipi(void);
2323 extern unsigned long wait_task_inactive(struct task_struct
*, long match_state
);
2325 static inline void scheduler_ipi(void) { }
2326 static inline unsigned long wait_task_inactive(struct task_struct
*p
,
2333 #define next_task(p) \
2334 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2336 #define for_each_process(p) \
2337 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2339 extern bool current_is_single_threaded(void);
2342 * Careful: do_each_thread/while_each_thread is a double loop so
2343 * 'break' will not work as expected - use goto instead.
2345 #define do_each_thread(g, t) \
2346 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2348 #define while_each_thread(g, t) \
2349 while ((t = next_thread(t)) != g)
2351 static inline int get_nr_threads(struct task_struct
*tsk
)
2353 return tsk
->signal
->nr_threads
;
2356 static inline bool thread_group_leader(struct task_struct
*p
)
2358 return p
->exit_signal
>= 0;
2361 /* Do to the insanities of de_thread it is possible for a process
2362 * to have the pid of the thread group leader without actually being
2363 * the thread group leader. For iteration through the pids in proc
2364 * all we care about is that we have a task with the appropriate
2365 * pid, we don't actually care if we have the right task.
2367 static inline int has_group_leader_pid(struct task_struct
*p
)
2369 return p
->pid
== p
->tgid
;
2373 int same_thread_group(struct task_struct
*p1
, struct task_struct
*p2
)
2375 return p1
->tgid
== p2
->tgid
;
2378 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
2380 return list_entry_rcu(p
->thread_group
.next
,
2381 struct task_struct
, thread_group
);
2384 static inline int thread_group_empty(struct task_struct
*p
)
2386 return list_empty(&p
->thread_group
);
2389 #define delay_group_leader(p) \
2390 (thread_group_leader(p) && !thread_group_empty(p))
2393 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2394 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2395 * pins the final release of task.io_context. Also protects ->cpuset and
2396 * ->cgroup.subsys[]. And ->vfork_done.
2398 * Nests both inside and outside of read_lock(&tasklist_lock).
2399 * It must not be nested with write_lock_irq(&tasklist_lock),
2400 * neither inside nor outside.
2402 static inline void task_lock(struct task_struct
*p
)
2404 spin_lock(&p
->alloc_lock
);
2407 static inline void task_unlock(struct task_struct
*p
)
2409 spin_unlock(&p
->alloc_lock
);
2412 extern struct sighand_struct
*__lock_task_sighand(struct task_struct
*tsk
,
2413 unsigned long *flags
);
2415 static inline struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
2416 unsigned long *flags
)
2418 struct sighand_struct
*ret
;
2420 ret
= __lock_task_sighand(tsk
, flags
);
2421 (void)__cond_lock(&tsk
->sighand
->siglock
, ret
);
2425 static inline void unlock_task_sighand(struct task_struct
*tsk
,
2426 unsigned long *flags
)
2428 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
2431 #ifdef CONFIG_CGROUPS
2432 static inline void threadgroup_change_begin(struct task_struct
*tsk
)
2434 down_read(&tsk
->signal
->group_rwsem
);
2436 static inline void threadgroup_change_end(struct task_struct
*tsk
)
2438 up_read(&tsk
->signal
->group_rwsem
);
2442 * threadgroup_lock - lock threadgroup
2443 * @tsk: member task of the threadgroup to lock
2445 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2446 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2447 * perform exec. This is useful for cases where the threadgroup needs to
2448 * stay stable across blockable operations.
2450 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2451 * synchronization. While held, no new task will be added to threadgroup
2452 * and no existing live task will have its PF_EXITING set.
2454 * During exec, a task goes and puts its thread group through unusual
2455 * changes. After de-threading, exclusive access is assumed to resources
2456 * which are usually shared by tasks in the same group - e.g. sighand may
2457 * be replaced with a new one. Also, the exec'ing task takes over group
2458 * leader role including its pid. Exclude these changes while locked by
2459 * grabbing cred_guard_mutex which is used to synchronize exec path.
2461 static inline void threadgroup_lock(struct task_struct
*tsk
)
2464 * exec uses exit for de-threading nesting group_rwsem inside
2465 * cred_guard_mutex. Grab cred_guard_mutex first.
2467 mutex_lock(&tsk
->signal
->cred_guard_mutex
);
2468 down_write(&tsk
->signal
->group_rwsem
);
2472 * threadgroup_unlock - unlock threadgroup
2473 * @tsk: member task of the threadgroup to unlock
2475 * Reverse threadgroup_lock().
2477 static inline void threadgroup_unlock(struct task_struct
*tsk
)
2479 up_write(&tsk
->signal
->group_rwsem
);
2480 mutex_unlock(&tsk
->signal
->cred_guard_mutex
);
2483 static inline void threadgroup_change_begin(struct task_struct
*tsk
) {}
2484 static inline void threadgroup_change_end(struct task_struct
*tsk
) {}
2485 static inline void threadgroup_lock(struct task_struct
*tsk
) {}
2486 static inline void threadgroup_unlock(struct task_struct
*tsk
) {}
2489 #ifndef __HAVE_THREAD_FUNCTIONS
2491 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2492 #define task_stack_page(task) ((task)->stack)
2494 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
2496 *task_thread_info(p
) = *task_thread_info(org
);
2497 task_thread_info(p
)->task
= p
;
2500 static inline unsigned long *end_of_stack(struct task_struct
*p
)
2502 return (unsigned long *)(task_thread_info(p
) + 1);
2507 static inline int object_is_on_stack(void *obj
)
2509 void *stack
= task_stack_page(current
);
2511 return (obj
>= stack
) && (obj
< (stack
+ THREAD_SIZE
));
2514 extern void thread_info_cache_init(void);
2516 #ifdef CONFIG_DEBUG_STACK_USAGE
2517 static inline unsigned long stack_not_used(struct task_struct
*p
)
2519 unsigned long *n
= end_of_stack(p
);
2521 do { /* Skip over canary */
2525 return (unsigned long)n
- (unsigned long)end_of_stack(p
);
2529 /* set thread flags in other task's structures
2530 * - see asm/thread_info.h for TIF_xxxx flags available
2532 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2534 set_ti_thread_flag(task_thread_info(tsk
), flag
);
2537 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2539 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2542 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2544 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
2547 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2549 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2552 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2554 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
2557 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
2559 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2562 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
2564 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2567 static inline int test_tsk_need_resched(struct task_struct
*tsk
)
2569 return unlikely(test_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
));
2572 static inline int restart_syscall(void)
2574 set_tsk_thread_flag(current
, TIF_SIGPENDING
);
2575 return -ERESTARTNOINTR
;
2578 static inline int signal_pending(struct task_struct
*p
)
2580 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
2583 static inline int __fatal_signal_pending(struct task_struct
*p
)
2585 return unlikely(sigismember(&p
->pending
.signal
, SIGKILL
));
2588 static inline int fatal_signal_pending(struct task_struct
*p
)
2590 return signal_pending(p
) && __fatal_signal_pending(p
);
2593 static inline int signal_pending_state(long state
, struct task_struct
*p
)
2595 if (!(state
& (TASK_INTERRUPTIBLE
| TASK_WAKEKILL
)))
2597 if (!signal_pending(p
))
2600 return (state
& TASK_INTERRUPTIBLE
) || __fatal_signal_pending(p
);
2603 static inline int need_resched(void)
2605 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
2609 * cond_resched() and cond_resched_lock(): latency reduction via
2610 * explicit rescheduling in places that are safe. The return
2611 * value indicates whether a reschedule was done in fact.
2612 * cond_resched_lock() will drop the spinlock before scheduling,
2613 * cond_resched_softirq() will enable bhs before scheduling.
2615 extern int _cond_resched(void);
2617 #define cond_resched() ({ \
2618 __might_sleep(__FILE__, __LINE__, 0); \
2622 extern int __cond_resched_lock(spinlock_t
*lock
);
2624 #ifdef CONFIG_PREEMPT_COUNT
2625 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2627 #define PREEMPT_LOCK_OFFSET 0
2630 #define cond_resched_lock(lock) ({ \
2631 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2632 __cond_resched_lock(lock); \
2635 extern int __cond_resched_softirq(void);
2637 #define cond_resched_softirq() ({ \
2638 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2639 __cond_resched_softirq(); \
2643 * Does a critical section need to be broken due to another
2644 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2645 * but a general need for low latency)
2647 static inline int spin_needbreak(spinlock_t
*lock
)
2649 #ifdef CONFIG_PREEMPT
2650 return spin_is_contended(lock
);
2657 * Thread group CPU time accounting.
2659 void thread_group_cputime(struct task_struct
*tsk
, struct task_cputime
*times
);
2660 void thread_group_cputimer(struct task_struct
*tsk
, struct task_cputime
*times
);
2662 static inline void thread_group_cputime_init(struct signal_struct
*sig
)
2664 raw_spin_lock_init(&sig
->cputimer
.lock
);
2668 * Reevaluate whether the task has signals pending delivery.
2669 * Wake the task if so.
2670 * This is required every time the blocked sigset_t changes.
2671 * callers must hold sighand->siglock.
2673 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
2674 extern void recalc_sigpending(void);
2676 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
2679 * Wrappers for p->thread_info->cpu access. No-op on UP.
2683 static inline unsigned int task_cpu(const struct task_struct
*p
)
2685 return task_thread_info(p
)->cpu
;
2688 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
2692 static inline unsigned int task_cpu(const struct task_struct
*p
)
2697 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
2701 #endif /* CONFIG_SMP */
2703 extern long sched_setaffinity(pid_t pid
, const struct cpumask
*new_mask
);
2704 extern long sched_getaffinity(pid_t pid
, struct cpumask
*mask
);
2706 extern void normalize_rt_tasks(void);
2708 #ifdef CONFIG_CGROUP_SCHED
2710 extern struct task_group root_task_group
;
2712 extern struct task_group
*sched_create_group(struct task_group
*parent
);
2713 extern void sched_destroy_group(struct task_group
*tg
);
2714 extern void sched_move_task(struct task_struct
*tsk
);
2715 #ifdef CONFIG_FAIR_GROUP_SCHED
2716 extern int sched_group_set_shares(struct task_group
*tg
, unsigned long shares
);
2717 extern unsigned long sched_group_shares(struct task_group
*tg
);
2719 #ifdef CONFIG_RT_GROUP_SCHED
2720 extern int sched_group_set_rt_runtime(struct task_group
*tg
,
2721 long rt_runtime_us
);
2722 extern long sched_group_rt_runtime(struct task_group
*tg
);
2723 extern int sched_group_set_rt_period(struct task_group
*tg
,
2725 extern long sched_group_rt_period(struct task_group
*tg
);
2726 extern int sched_rt_can_attach(struct task_group
*tg
, struct task_struct
*tsk
);
2730 extern int task_can_switch_user(struct user_struct
*up
,
2731 struct task_struct
*tsk
);
2733 #ifdef CONFIG_TASK_XACCT
2734 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2736 tsk
->ioac
.rchar
+= amt
;
2739 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2741 tsk
->ioac
.wchar
+= amt
;
2744 static inline void inc_syscr(struct task_struct
*tsk
)
2749 static inline void inc_syscw(struct task_struct
*tsk
)
2754 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2758 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2762 static inline void inc_syscr(struct task_struct
*tsk
)
2766 static inline void inc_syscw(struct task_struct
*tsk
)
2771 #ifndef TASK_SIZE_OF
2772 #define TASK_SIZE_OF(tsk) TASK_SIZE
2775 #ifdef CONFIG_MM_OWNER
2776 extern void mm_update_next_owner(struct mm_struct
*mm
);
2777 extern void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
);
2779 static inline void mm_update_next_owner(struct mm_struct
*mm
)
2783 static inline void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
)
2786 #endif /* CONFIG_MM_OWNER */
2788 static inline unsigned long task_rlimit(const struct task_struct
*tsk
,
2791 return ACCESS_ONCE(tsk
->signal
->rlim
[limit
].rlim_cur
);
2794 static inline unsigned long task_rlimit_max(const struct task_struct
*tsk
,
2797 return ACCESS_ONCE(tsk
->signal
->rlim
[limit
].rlim_max
);
2800 static inline unsigned long rlimit(unsigned int limit
)
2802 return task_rlimit(current
, limit
);
2805 static inline unsigned long rlimit_max(unsigned int limit
)
2807 return task_rlimit_max(current
, limit
);
2810 #endif /* __KERNEL__ */