7 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
8 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
9 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
10 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
11 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
12 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
13 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
14 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
15 #define CLONE_THREAD 0x00010000 /* Same thread group? */
16 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
17 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
18 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
19 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
20 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
21 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
22 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
23 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
24 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
25 #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
26 #define CLONE_NEWIPC 0x08000000 /* New ipcs */
27 #define CLONE_NEWUSER 0x10000000 /* New user namespace */
28 #define CLONE_NEWPID 0x20000000 /* New pid namespace */
29 #define CLONE_NEWNET 0x40000000 /* New network namespace */
30 #define CLONE_IO 0x80000000 /* Clone io context */
35 #define SCHED_NORMAL 0
39 /* SCHED_ISO: reserved but not implemented yet */
41 /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
42 #define SCHED_RESET_ON_FORK 0x40000000
50 #include <asm/param.h> /* for HZ */
52 #include <linux/capability.h>
53 #include <linux/threads.h>
54 #include <linux/kernel.h>
55 #include <linux/types.h>
56 #include <linux/timex.h>
57 #include <linux/jiffies.h>
58 #include <linux/rbtree.h>
59 #include <linux/thread_info.h>
60 #include <linux/cpumask.h>
61 #include <linux/errno.h>
62 #include <linux/nodemask.h>
63 #include <linux/mm_types.h>
65 #include <asm/system.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/path.h>
74 #include <linux/compiler.h>
75 #include <linux/completion.h>
76 #include <linux/pid.h>
77 #include <linux/percpu.h>
78 #include <linux/topology.h>
79 #include <linux/proportions.h>
80 #include <linux/seccomp.h>
81 #include <linux/rcupdate.h>
82 #include <linux/rculist.h>
83 #include <linux/rtmutex.h>
85 #include <linux/time.h>
86 #include <linux/param.h>
87 #include <linux/resource.h>
88 #include <linux/timer.h>
89 #include <linux/hrtimer.h>
90 #include <linux/task_io_accounting.h>
91 #include <linux/kobject.h>
92 #include <linux/latencytop.h>
93 #include <linux/cred.h>
95 #include <asm/processor.h>
98 struct futex_pi_state
;
99 struct robust_list_head
;
103 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 void calc_global_load(void);
144 extern u64
cpu_nr_migrations(int cpu
);
146 extern unsigned long get_parent_ip(unsigned long addr
);
151 #ifdef CONFIG_SCHED_DEBUG
152 extern void proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
);
153 extern void proc_sched_set_task(struct task_struct
*p
);
155 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
);
158 proc_sched_show_task(struct task_struct
*p
, struct seq_file
*m
)
161 static inline void proc_sched_set_task(struct task_struct
*p
)
165 print_cfs_rq(struct seq_file
*m
, int cpu
, struct cfs_rq
*cfs_rq
)
170 extern unsigned long long time_sync_thresh
;
173 * Task state bitmask. NOTE! These bits are also
174 * encoded in fs/proc/array.c: get_task_state().
176 * We have two separate sets of flags: task->state
177 * is about runnability, while task->exit_state are
178 * about the task exiting. Confusing, but this way
179 * modifying one set can't modify the other one by
182 #define TASK_RUNNING 0
183 #define TASK_INTERRUPTIBLE 1
184 #define TASK_UNINTERRUPTIBLE 2
185 #define __TASK_STOPPED 4
186 #define __TASK_TRACED 8
187 /* in tsk->exit_state */
188 #define EXIT_ZOMBIE 16
190 /* in tsk->state again */
192 #define TASK_WAKEKILL 128
193 #define TASK_WAKING 256
195 /* Convenience macros for the sake of set_task_state */
196 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
197 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
198 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
200 /* Convenience macros for the sake of wake_up */
201 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
202 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
204 /* get_task_state() */
205 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
206 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
209 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
210 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
211 #define task_is_stopped_or_traced(task) \
212 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
213 #define task_contributes_to_load(task) \
214 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
215 (task->flags & PF_FREEZING) == 0)
217 #define __set_task_state(tsk, state_value) \
218 do { (tsk)->state = (state_value); } while (0)
219 #define set_task_state(tsk, state_value) \
220 set_mb((tsk)->state, (state_value))
223 * set_current_state() includes a barrier so that the write of current->state
224 * is correctly serialised wrt the caller's subsequent test of whether to
227 * set_current_state(TASK_UNINTERRUPTIBLE);
228 * if (do_i_need_to_sleep())
231 * If the caller does not need such serialisation then use __set_current_state()
233 #define __set_current_state(state_value) \
234 do { current->state = (state_value); } while (0)
235 #define set_current_state(state_value) \
236 set_mb(current->state, (state_value))
238 /* Task command name length */
239 #define TASK_COMM_LEN 16
241 #include <linux/spinlock.h>
244 * This serializes "schedule()" and also protects
245 * the run-queue from deletions/modifications (but
246 * _adding_ to the beginning of the run-queue has
249 extern rwlock_t tasklist_lock
;
250 extern spinlock_t mmlist_lock
;
254 extern void sched_init(void);
255 extern void sched_init_smp(void);
256 extern asmlinkage
void schedule_tail(struct task_struct
*prev
);
257 extern void init_idle(struct task_struct
*idle
, int cpu
);
258 extern void init_idle_bootup_task(struct task_struct
*idle
);
260 extern int runqueue_is_locked(int cpu
);
261 extern void task_rq_unlock_wait(struct task_struct
*p
);
263 extern cpumask_var_t nohz_cpu_mask
;
264 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
265 extern int select_nohz_load_balancer(int cpu
);
266 extern int get_nohz_load_balancer(void);
268 static inline int select_nohz_load_balancer(int cpu
)
275 * Only dump TASK_* tasks. (0 for all tasks)
277 extern void show_state_filter(unsigned long state_filter
);
279 static inline void show_state(void)
281 show_state_filter(0);
284 extern void show_regs(struct pt_regs
*);
287 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
288 * task), SP is the stack pointer of the first frame that should be shown in the back
289 * trace (or NULL if the entire call-chain of the task should be shown).
291 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
293 void io_schedule(void);
294 long io_schedule_timeout(long timeout
);
296 extern void cpu_init (void);
297 extern void trap_init(void);
298 extern void update_process_times(int user
);
299 extern void scheduler_tick(void);
301 extern void sched_show_task(struct task_struct
*p
);
303 #ifdef CONFIG_DETECT_SOFTLOCKUP
304 extern void softlockup_tick(void);
305 extern void touch_softlockup_watchdog(void);
306 extern void touch_all_softlockup_watchdogs(void);
307 extern int proc_dosoftlockup_thresh(struct ctl_table
*table
, int write
,
308 struct file
*filp
, void __user
*buffer
,
309 size_t *lenp
, loff_t
*ppos
);
310 extern unsigned int softlockup_panic
;
311 extern int softlockup_thresh
;
313 static inline void softlockup_tick(void)
316 static inline void touch_softlockup_watchdog(void)
319 static inline void touch_all_softlockup_watchdogs(void)
324 #ifdef CONFIG_DETECT_HUNG_TASK
325 extern unsigned int sysctl_hung_task_panic
;
326 extern unsigned long sysctl_hung_task_check_count
;
327 extern unsigned long sysctl_hung_task_timeout_secs
;
328 extern unsigned long sysctl_hung_task_warnings
;
329 extern int proc_dohung_task_timeout_secs(struct ctl_table
*table
, int write
,
330 struct file
*filp
, void __user
*buffer
,
331 size_t *lenp
, loff_t
*ppos
);
334 /* Attach to any functions which should be ignored in wchan output. */
335 #define __sched __attribute__((__section__(".sched.text")))
337 /* Linker adds these: start and end of __sched functions */
338 extern char __sched_text_start
[], __sched_text_end
[];
340 /* Is this address in the __sched functions? */
341 extern int in_sched_functions(unsigned long addr
);
343 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
344 extern signed long schedule_timeout(signed long timeout
);
345 extern signed long schedule_timeout_interruptible(signed long timeout
);
346 extern signed long schedule_timeout_killable(signed long timeout
);
347 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
348 asmlinkage
void __schedule(void);
349 asmlinkage
void schedule(void);
350 extern int mutex_spin_on_owner(struct mutex
*lock
, struct thread_info
*owner
);
353 struct user_namespace
;
356 * Default maximum number of active map areas, this limits the number of vmas
357 * per mm struct. Users can overwrite this number by sysctl but there is a
360 * When a program's coredump is generated as ELF format, a section is created
361 * per a vma. In ELF, the number of sections is represented in unsigned short.
362 * This means the number of sections should be smaller than 65535 at coredump.
363 * Because the kernel adds some informative sections to a image of program at
364 * generating coredump, we need some margin. The number of extra sections is
365 * 1-3 now and depends on arch. We use "5" as safe margin, here.
367 #define MAPCOUNT_ELF_CORE_MARGIN (5)
368 #define DEFAULT_MAX_MAP_COUNT (USHORT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
370 extern int sysctl_max_map_count
;
372 #include <linux/aio.h>
375 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
376 unsigned long, unsigned long);
378 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
379 unsigned long len
, unsigned long pgoff
,
380 unsigned long flags
);
381 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
382 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
384 #if USE_SPLIT_PTLOCKS
386 * The mm counters are not protected by its page_table_lock,
387 * so must be incremented atomically.
389 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
390 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
391 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
392 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
393 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
395 #else /* !USE_SPLIT_PTLOCKS */
397 * The mm counters are protected by its page_table_lock,
398 * so can be incremented directly.
400 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
401 #define get_mm_counter(mm, member) ((mm)->_##member)
402 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
403 #define inc_mm_counter(mm, member) (mm)->_##member++
404 #define dec_mm_counter(mm, member) (mm)->_##member--
406 #endif /* !USE_SPLIT_PTLOCKS */
408 #define get_mm_rss(mm) \
409 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
410 #define update_hiwater_rss(mm) do { \
411 unsigned long _rss = get_mm_rss(mm); \
412 if ((mm)->hiwater_rss < _rss) \
413 (mm)->hiwater_rss = _rss; \
415 #define update_hiwater_vm(mm) do { \
416 if ((mm)->hiwater_vm < (mm)->total_vm) \
417 (mm)->hiwater_vm = (mm)->total_vm; \
420 static inline unsigned long get_mm_hiwater_rss(struct mm_struct
*mm
)
422 return max(mm
->hiwater_rss
, get_mm_rss(mm
));
425 static inline unsigned long get_mm_hiwater_vm(struct mm_struct
*mm
)
427 return max(mm
->hiwater_vm
, mm
->total_vm
);
430 extern void set_dumpable(struct mm_struct
*mm
, int value
);
431 extern int get_dumpable(struct mm_struct
*mm
);
435 #define MMF_DUMPABLE 0 /* core dump is permitted */
436 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
438 #define MMF_DUMPABLE_BITS 2
439 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
441 /* coredump filter bits */
442 #define MMF_DUMP_ANON_PRIVATE 2
443 #define MMF_DUMP_ANON_SHARED 3
444 #define MMF_DUMP_MAPPED_PRIVATE 4
445 #define MMF_DUMP_MAPPED_SHARED 5
446 #define MMF_DUMP_ELF_HEADERS 6
447 #define MMF_DUMP_HUGETLB_PRIVATE 7
448 #define MMF_DUMP_HUGETLB_SHARED 8
450 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
451 #define MMF_DUMP_FILTER_BITS 7
452 #define MMF_DUMP_FILTER_MASK \
453 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
454 #define MMF_DUMP_FILTER_DEFAULT \
455 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
456 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
458 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
459 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
461 # define MMF_DUMP_MASK_DEFAULT_ELF 0
463 /* leave room for more dump flags */
464 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
466 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
468 struct sighand_struct
{
470 struct k_sigaction action
[_NSIG
];
472 wait_queue_head_t signalfd_wqh
;
475 struct pacct_struct
{
478 unsigned long ac_mem
;
479 cputime_t ac_utime
, ac_stime
;
480 unsigned long ac_minflt
, ac_majflt
;
484 * struct task_cputime - collected CPU time counts
485 * @utime: time spent in user mode, in &cputime_t units
486 * @stime: time spent in kernel mode, in &cputime_t units
487 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
489 * This structure groups together three kinds of CPU time that are
490 * tracked for threads and thread groups. Most things considering
491 * CPU time want to group these counts together and treat all three
492 * of them in parallel.
494 struct task_cputime
{
497 unsigned long long sum_exec_runtime
;
499 /* Alternate field names when used to cache expirations. */
500 #define prof_exp stime
501 #define virt_exp utime
502 #define sched_exp sum_exec_runtime
504 #define INIT_CPUTIME \
505 (struct task_cputime) { \
506 .utime = cputime_zero, \
507 .stime = cputime_zero, \
508 .sum_exec_runtime = 0, \
512 * Disable preemption until the scheduler is running.
513 * Reset by start_kernel()->sched_init()->init_idle().
515 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
516 * before the scheduler is active -- see should_resched().
518 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
521 * struct thread_group_cputimer - thread group interval timer counts
522 * @cputime: thread group interval timers.
523 * @running: non-zero when there are timers running and
524 * @cputime receives updates.
525 * @lock: lock for fields in this struct.
527 * This structure contains the version of task_cputime, above, that is
528 * used for thread group CPU timer calculations.
530 struct thread_group_cputimer
{
531 struct task_cputime cputime
;
537 * NOTE! "signal_struct" does not have it's own
538 * locking, because a shared signal_struct always
539 * implies a shared sighand_struct, so locking
540 * sighand_struct is always a proper superset of
541 * the locking of signal_struct.
543 struct signal_struct
{
547 wait_queue_head_t wait_chldexit
; /* for wait4() */
549 /* current thread group signal load-balancing target: */
550 struct task_struct
*curr_target
;
552 /* shared signal handling: */
553 struct sigpending shared_pending
;
555 /* thread group exit support */
558 * - notify group_exit_task when ->count is equal to notify_count
559 * - everyone except group_exit_task is stopped during signal delivery
560 * of fatal signals, group_exit_task processes the signal.
563 struct task_struct
*group_exit_task
;
565 /* thread group stop support, overloads group_exit_code too */
566 int group_stop_count
;
567 unsigned int flags
; /* see SIGNAL_* flags below */
569 /* POSIX.1b Interval Timers */
570 struct list_head posix_timers
;
572 /* ITIMER_REAL timer for the process */
573 struct hrtimer real_timer
;
574 struct pid
*leader_pid
;
575 ktime_t it_real_incr
;
577 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
578 cputime_t it_prof_expires
, it_virt_expires
;
579 cputime_t it_prof_incr
, it_virt_incr
;
582 * Thread group totals for process CPU timers.
583 * See thread_group_cputimer(), et al, for details.
585 struct thread_group_cputimer cputimer
;
587 /* Earliest-expiration cache. */
588 struct task_cputime cputime_expires
;
590 struct list_head cpu_timers
[3];
592 struct pid
*tty_old_pgrp
;
594 /* boolean value for session group leader */
597 struct tty_struct
*tty
; /* NULL if no tty */
600 * Cumulative resource counters for dead threads in the group,
601 * and for reaped dead child processes forked by this group.
602 * Live threads maintain their own counters and add to these
603 * in __exit_signal, except for the group leader.
605 cputime_t utime
, stime
, cutime
, cstime
;
608 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
609 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
610 unsigned long inblock
, oublock
, cinblock
, coublock
;
611 struct task_io_accounting ioac
;
614 * Cumulative ns of schedule CPU time fo dead threads in the
615 * group, not including a zombie group leader, (This only differs
616 * from jiffies_to_ns(utime + stime) if sched_clock uses something
617 * other than jiffies.)
619 unsigned long long sum_sched_runtime
;
622 * We don't bother to synchronize most readers of this at all,
623 * because there is no reader checking a limit that actually needs
624 * to get both rlim_cur and rlim_max atomically, and either one
625 * alone is a single word that can safely be read normally.
626 * getrlimit/setrlimit use task_lock(current->group_leader) to
627 * protect this instead of the siglock, because they really
628 * have no need to disable irqs.
630 struct rlimit rlim
[RLIM_NLIMITS
];
632 #ifdef CONFIG_BSD_PROCESS_ACCT
633 struct pacct_struct pacct
; /* per-process accounting information */
635 #ifdef CONFIG_TASKSTATS
636 struct taskstats
*stats
;
640 struct tty_audit_buf
*tty_audit_buf
;
644 /* Context switch must be unlocked if interrupts are to be enabled */
645 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
646 # define __ARCH_WANT_UNLOCKED_CTXSW
650 * Bits in flags field of signal_struct.
652 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
653 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
654 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
655 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
657 * Pending notifications to parent.
659 #define SIGNAL_CLD_STOPPED 0x00000010
660 #define SIGNAL_CLD_CONTINUED 0x00000020
661 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
663 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
665 /* If true, all threads except ->group_exit_task have pending SIGKILL */
666 static inline int signal_group_exit(const struct signal_struct
*sig
)
668 return (sig
->flags
& SIGNAL_GROUP_EXIT
) ||
669 (sig
->group_exit_task
!= NULL
);
673 * Some day this will be a full-fledged user tracking system..
676 atomic_t __count
; /* reference count */
677 atomic_t processes
; /* How many processes does this user have? */
678 atomic_t files
; /* How many open files does this user have? */
679 atomic_t sigpending
; /* How many pending signals does this user have? */
680 #ifdef CONFIG_INOTIFY_USER
681 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
682 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
685 atomic_t epoll_watches
; /* The number of file descriptors currently watched */
687 #ifdef CONFIG_POSIX_MQUEUE
688 /* protected by mq_lock */
689 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
691 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
694 struct key
*uid_keyring
; /* UID specific keyring */
695 struct key
*session_keyring
; /* UID's default session keyring */
698 /* Hash table maintenance information */
699 struct hlist_node uidhash_node
;
701 struct user_namespace
*user_ns
;
703 #ifdef CONFIG_USER_SCHED
704 struct task_group
*tg
;
707 struct delayed_work work
;
711 #ifdef CONFIG_PERF_EVENTS
712 atomic_long_t locked_vm
;
716 extern int uids_sysfs_init(void);
718 extern struct user_struct
*find_user(uid_t
);
720 extern struct user_struct root_user
;
721 #define INIT_USER (&root_user)
724 struct backing_dev_info
;
725 struct reclaim_state
;
727 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
729 /* cumulative counters */
730 unsigned long pcount
; /* # of times run on this cpu */
731 unsigned long long run_delay
; /* time spent waiting on a runqueue */
734 unsigned long long last_arrival
,/* when we last ran on a cpu */
735 last_queued
; /* when we were last queued to run */
736 #ifdef CONFIG_SCHEDSTATS
738 unsigned int bkl_count
;
741 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
743 #ifdef CONFIG_TASK_DELAY_ACCT
744 struct task_delay_info
{
746 unsigned int flags
; /* Private per-task flags */
748 /* For each stat XXX, add following, aligned appropriately
750 * struct timespec XXX_start, XXX_end;
754 * Atomicity of updates to XXX_delay, XXX_count protected by
755 * single lock above (split into XXX_lock if contention is an issue).
759 * XXX_count is incremented on every XXX operation, the delay
760 * associated with the operation is added to XXX_delay.
761 * XXX_delay contains the accumulated delay time in nanoseconds.
763 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
764 u64 blkio_delay
; /* wait for sync block io completion */
765 u64 swapin_delay
; /* wait for swapin block io completion */
766 u32 blkio_count
; /* total count of the number of sync block */
767 /* io operations performed */
768 u32 swapin_count
; /* total count of the number of swapin block */
769 /* io operations performed */
771 struct timespec freepages_start
, freepages_end
;
772 u64 freepages_delay
; /* wait for memory reclaim */
773 u32 freepages_count
; /* total count of memory reclaim */
775 #endif /* CONFIG_TASK_DELAY_ACCT */
777 static inline int sched_info_on(void)
779 #ifdef CONFIG_SCHEDSTATS
781 #elif defined(CONFIG_TASK_DELAY_ACCT)
782 extern int delayacct_on
;
797 * sched-domains (multiprocessor balancing) declarations:
801 * Increase resolution of nice-level calculations:
803 #define SCHED_LOAD_SHIFT 10
804 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
806 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
809 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
810 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
811 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
812 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
813 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
814 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
815 #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */
816 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
817 #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */
818 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
819 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
821 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
823 enum powersavings_balance_level
{
824 POWERSAVINGS_BALANCE_NONE
= 0, /* No power saving load balance */
825 POWERSAVINGS_BALANCE_BASIC
, /* Fill one thread/core/package
826 * first for long running threads
828 POWERSAVINGS_BALANCE_WAKEUP
, /* Also bias task wakeups to semi-idle
829 * cpu package for power savings
831 MAX_POWERSAVINGS_BALANCE_LEVELS
834 extern int sched_mc_power_savings
, sched_smt_power_savings
;
836 static inline int sd_balance_for_mc_power(void)
838 if (sched_smt_power_savings
)
839 return SD_POWERSAVINGS_BALANCE
;
841 return SD_PREFER_SIBLING
;
844 static inline int sd_balance_for_package_power(void)
846 if (sched_mc_power_savings
| sched_smt_power_savings
)
847 return SD_POWERSAVINGS_BALANCE
;
849 return SD_PREFER_SIBLING
;
853 * Optimise SD flags for power savings:
854 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
855 * Keep default SD flags if sched_{smt,mc}_power_saving=0
858 static inline int sd_power_saving_flags(void)
860 if (sched_mc_power_savings
| sched_smt_power_savings
)
861 return SD_BALANCE_NEWIDLE
;
867 struct sched_group
*next
; /* Must be a circular list */
870 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
873 unsigned int cpu_power
;
876 * The CPUs this group covers.
878 * NOTE: this field is variable length. (Allocated dynamically
879 * by attaching extra space to the end of the structure,
880 * depending on how many CPUs the kernel has booted up with)
882 * It is also be embedded into static data structures at build
883 * time. (See 'struct static_sched_group' in kernel/sched.c)
885 unsigned long cpumask
[0];
888 static inline struct cpumask
*sched_group_cpus(struct sched_group
*sg
)
890 return to_cpumask(sg
->cpumask
);
893 enum sched_domain_level
{
903 struct sched_domain_attr
{
904 int relax_domain_level
;
907 #define SD_ATTR_INIT (struct sched_domain_attr) { \
908 .relax_domain_level = -1, \
911 struct sched_domain
{
912 /* These fields must be setup */
913 struct sched_domain
*parent
; /* top domain must be null terminated */
914 struct sched_domain
*child
; /* bottom domain must be null terminated */
915 struct sched_group
*groups
; /* the balancing groups of the domain */
916 unsigned long min_interval
; /* Minimum balance interval ms */
917 unsigned long max_interval
; /* Maximum balance interval ms */
918 unsigned int busy_factor
; /* less balancing by factor if busy */
919 unsigned int imbalance_pct
; /* No balance until over watermark */
920 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
921 unsigned int busy_idx
;
922 unsigned int idle_idx
;
923 unsigned int newidle_idx
;
924 unsigned int wake_idx
;
925 unsigned int forkexec_idx
;
926 unsigned int smt_gain
;
927 int flags
; /* See SD_* */
928 enum sched_domain_level level
;
930 /* Runtime fields. */
931 unsigned long last_balance
; /* init to jiffies. units in jiffies */
932 unsigned int balance_interval
; /* initialise to 1. units in ms. */
933 unsigned int nr_balance_failed
; /* initialise to 0 */
937 #ifdef CONFIG_SCHEDSTATS
938 /* load_balance() stats */
939 unsigned int lb_count
[CPU_MAX_IDLE_TYPES
];
940 unsigned int lb_failed
[CPU_MAX_IDLE_TYPES
];
941 unsigned int lb_balanced
[CPU_MAX_IDLE_TYPES
];
942 unsigned int lb_imbalance
[CPU_MAX_IDLE_TYPES
];
943 unsigned int lb_gained
[CPU_MAX_IDLE_TYPES
];
944 unsigned int lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
945 unsigned int lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
946 unsigned int lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
948 /* Active load balancing */
949 unsigned int alb_count
;
950 unsigned int alb_failed
;
951 unsigned int alb_pushed
;
953 /* SD_BALANCE_EXEC stats */
954 unsigned int sbe_count
;
955 unsigned int sbe_balanced
;
956 unsigned int sbe_pushed
;
958 /* SD_BALANCE_FORK stats */
959 unsigned int sbf_count
;
960 unsigned int sbf_balanced
;
961 unsigned int sbf_pushed
;
963 /* try_to_wake_up() stats */
964 unsigned int ttwu_wake_remote
;
965 unsigned int ttwu_move_affine
;
966 unsigned int ttwu_move_balance
;
968 #ifdef CONFIG_SCHED_DEBUG
973 * Span of all CPUs in this domain.
975 * NOTE: this field is variable length. (Allocated dynamically
976 * by attaching extra space to the end of the structure,
977 * depending on how many CPUs the kernel has booted up with)
979 * It is also be embedded into static data structures at build
980 * time. (See 'struct static_sched_domain' in kernel/sched.c)
982 unsigned long span
[0];
985 static inline struct cpumask
*sched_domain_span(struct sched_domain
*sd
)
987 return to_cpumask(sd
->span
);
990 extern void partition_sched_domains(int ndoms_new
, struct cpumask
*doms_new
,
991 struct sched_domain_attr
*dattr_new
);
993 /* Test a flag in parent sched domain */
994 static inline int test_sd_parent(struct sched_domain
*sd
, int flag
)
996 if (sd
->parent
&& (sd
->parent
->flags
& flag
))
1002 unsigned long default_scale_freq_power(struct sched_domain
*sd
, int cpu
);
1003 unsigned long default_scale_smt_power(struct sched_domain
*sd
, int cpu
);
1005 #else /* CONFIG_SMP */
1007 struct sched_domain_attr
;
1010 partition_sched_domains(int ndoms_new
, struct cpumask
*doms_new
,
1011 struct sched_domain_attr
*dattr_new
)
1014 #endif /* !CONFIG_SMP */
1017 struct io_context
; /* See blkdev.h */
1020 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1021 extern void prefetch_stack(struct task_struct
*t
);
1023 static inline void prefetch_stack(struct task_struct
*t
) { }
1026 struct audit_context
; /* See audit.c */
1028 struct pipe_inode_info
;
1029 struct uts_namespace
;
1032 struct sched_domain
;
1037 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
1038 #define WF_FORK 0x02 /* child wakeup after fork */
1040 struct sched_class
{
1041 const struct sched_class
*next
;
1043 void (*enqueue_task
) (struct rq
*rq
, struct task_struct
*p
, int wakeup
);
1044 void (*dequeue_task
) (struct rq
*rq
, struct task_struct
*p
, int sleep
);
1045 void (*yield_task
) (struct rq
*rq
);
1047 void (*check_preempt_curr
) (struct rq
*rq
, struct task_struct
*p
, int flags
);
1049 struct task_struct
* (*pick_next_task
) (struct rq
*rq
);
1050 void (*put_prev_task
) (struct rq
*rq
, struct task_struct
*p
);
1053 int (*select_task_rq
)(struct task_struct
*p
, int sd_flag
, int flags
);
1055 unsigned long (*load_balance
) (struct rq
*this_rq
, int this_cpu
,
1056 struct rq
*busiest
, unsigned long max_load_move
,
1057 struct sched_domain
*sd
, enum cpu_idle_type idle
,
1058 int *all_pinned
, int *this_best_prio
);
1060 int (*move_one_task
) (struct rq
*this_rq
, int this_cpu
,
1061 struct rq
*busiest
, struct sched_domain
*sd
,
1062 enum cpu_idle_type idle
);
1063 void (*pre_schedule
) (struct rq
*this_rq
, struct task_struct
*task
);
1064 void (*post_schedule
) (struct rq
*this_rq
);
1065 void (*task_wake_up
) (struct rq
*this_rq
, struct task_struct
*task
);
1067 void (*set_cpus_allowed
)(struct task_struct
*p
,
1068 const struct cpumask
*newmask
);
1070 void (*rq_online
)(struct rq
*rq
);
1071 void (*rq_offline
)(struct rq
*rq
);
1074 void (*set_curr_task
) (struct rq
*rq
);
1075 void (*task_tick
) (struct rq
*rq
, struct task_struct
*p
, int queued
);
1076 void (*task_new
) (struct rq
*rq
, struct task_struct
*p
);
1078 void (*switched_from
) (struct rq
*this_rq
, struct task_struct
*task
,
1080 void (*switched_to
) (struct rq
*this_rq
, struct task_struct
*task
,
1082 void (*prio_changed
) (struct rq
*this_rq
, struct task_struct
*task
,
1083 int oldprio
, int running
);
1085 unsigned int (*get_rr_interval
) (struct task_struct
*task
);
1087 #ifdef CONFIG_FAIR_GROUP_SCHED
1088 void (*moved_group
) (struct task_struct
*p
);
1092 struct load_weight
{
1093 unsigned long weight
, inv_weight
;
1097 * CFS stats for a schedulable entity (task, task-group etc)
1099 * Current field usage histogram:
1106 struct sched_entity
{
1107 struct load_weight load
; /* for load-balancing */
1108 struct rb_node run_node
;
1109 struct list_head group_node
;
1113 u64 sum_exec_runtime
;
1115 u64 prev_sum_exec_runtime
;
1127 #ifdef CONFIG_SCHEDSTATS
1137 s64 sum_sleep_runtime
;
1144 u64 nr_migrations_cold
;
1145 u64 nr_failed_migrations_affine
;
1146 u64 nr_failed_migrations_running
;
1147 u64 nr_failed_migrations_hot
;
1148 u64 nr_forced_migrations
;
1149 u64 nr_forced2_migrations
;
1152 u64 nr_wakeups_sync
;
1153 u64 nr_wakeups_migrate
;
1154 u64 nr_wakeups_local
;
1155 u64 nr_wakeups_remote
;
1156 u64 nr_wakeups_affine
;
1157 u64 nr_wakeups_affine_attempts
;
1158 u64 nr_wakeups_passive
;
1159 u64 nr_wakeups_idle
;
1162 #ifdef CONFIG_FAIR_GROUP_SCHED
1163 struct sched_entity
*parent
;
1164 /* rq on which this entity is (to be) queued: */
1165 struct cfs_rq
*cfs_rq
;
1166 /* rq "owned" by this entity/group: */
1167 struct cfs_rq
*my_q
;
1171 struct sched_rt_entity
{
1172 struct list_head run_list
;
1173 unsigned long timeout
;
1174 unsigned int time_slice
;
1175 int nr_cpus_allowed
;
1177 struct sched_rt_entity
*back
;
1178 #ifdef CONFIG_RT_GROUP_SCHED
1179 struct sched_rt_entity
*parent
;
1180 /* rq on which this entity is (to be) queued: */
1181 struct rt_rq
*rt_rq
;
1182 /* rq "owned" by this entity/group: */
1189 struct task_struct
{
1190 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
1193 unsigned int flags
; /* per process flags, defined below */
1194 unsigned int ptrace
;
1196 int lock_depth
; /* BKL lock depth */
1199 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1204 int prio
, static_prio
, normal_prio
;
1205 unsigned int rt_priority
;
1206 const struct sched_class
*sched_class
;
1207 struct sched_entity se
;
1208 struct sched_rt_entity rt
;
1210 #ifdef CONFIG_PREEMPT_NOTIFIERS
1211 /* list of struct preempt_notifier: */
1212 struct hlist_head preempt_notifiers
;
1216 * fpu_counter contains the number of consecutive context switches
1217 * that the FPU is used. If this is over a threshold, the lazy fpu
1218 * saving becomes unlazy to save the trap. This is an unsigned char
1219 * so that after 256 times the counter wraps and the behavior turns
1220 * lazy again; this to deal with bursty apps that only use FPU for
1223 unsigned char fpu_counter
;
1224 s8 oomkilladj
; /* OOM kill score adjustment (bit shift). */
1225 #ifdef CONFIG_BLK_DEV_IO_TRACE
1226 unsigned int btrace_seq
;
1229 unsigned int policy
;
1230 cpumask_t cpus_allowed
;
1232 #ifdef CONFIG_TREE_PREEMPT_RCU
1233 int rcu_read_lock_nesting
;
1234 char rcu_read_unlock_special
;
1235 struct rcu_node
*rcu_blocked_node
;
1236 struct list_head rcu_node_entry
;
1237 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1239 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1240 struct sched_info sched_info
;
1243 struct list_head tasks
;
1244 struct plist_node pushable_tasks
;
1246 struct mm_struct
*mm
, *active_mm
;
1249 struct linux_binfmt
*binfmt
;
1251 int exit_code
, exit_signal
;
1252 int pdeath_signal
; /* The signal sent when the parent dies */
1254 unsigned int personality
;
1255 unsigned did_exec
:1;
1256 unsigned in_execve
:1; /* Tell the LSMs that the process is doing an
1258 unsigned in_iowait
:1;
1261 /* Revert to default priority/policy when forking */
1262 unsigned sched_reset_on_fork
:1;
1267 #ifdef CONFIG_CC_STACKPROTECTOR
1268 /* Canary value for the -fstack-protector gcc feature */
1269 unsigned long stack_canary
;
1273 * pointers to (original) parent process, youngest child, younger sibling,
1274 * older sibling, respectively. (p->father can be replaced with
1275 * p->real_parent->pid)
1277 struct task_struct
*real_parent
; /* real parent process */
1278 struct task_struct
*parent
; /* recipient of SIGCHLD, wait4() reports */
1280 * children/sibling forms the list of my natural children
1282 struct list_head children
; /* list of my children */
1283 struct list_head sibling
; /* linkage in my parent's children list */
1284 struct task_struct
*group_leader
; /* threadgroup leader */
1287 * ptraced is the list of tasks this task is using ptrace on.
1288 * This includes both natural children and PTRACE_ATTACH targets.
1289 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1291 struct list_head ptraced
;
1292 struct list_head ptrace_entry
;
1295 * This is the tracer handle for the ptrace BTS extension.
1296 * This field actually belongs to the ptracer task.
1298 struct bts_context
*bts
;
1300 /* PID/PID hash table linkage. */
1301 struct pid_link pids
[PIDTYPE_MAX
];
1302 struct list_head thread_group
;
1304 struct completion
*vfork_done
; /* for vfork() */
1305 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
1306 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
1308 cputime_t utime
, stime
, utimescaled
, stimescaled
;
1310 cputime_t prev_utime
, prev_stime
;
1311 unsigned long nvcsw
, nivcsw
; /* context switch counts */
1312 struct timespec start_time
; /* monotonic time */
1313 struct timespec real_start_time
; /* boot based time */
1314 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1315 unsigned long min_flt
, maj_flt
;
1317 struct task_cputime cputime_expires
;
1318 struct list_head cpu_timers
[3];
1320 /* process credentials */
1321 const struct cred
*real_cred
; /* objective and real subjective task
1322 * credentials (COW) */
1323 const struct cred
*cred
; /* effective (overridable) subjective task
1324 * credentials (COW) */
1325 struct mutex cred_guard_mutex
; /* guard against foreign influences on
1326 * credential calculations
1327 * (notably. ptrace) */
1328 struct cred
*replacement_session_keyring
; /* for KEYCTL_SESSION_TO_PARENT */
1330 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
1331 - access with [gs]et_task_comm (which lock
1332 it with task_lock())
1333 - initialized normally by flush_old_exec */
1334 /* file system info */
1335 int link_count
, total_link_count
;
1336 #ifdef CONFIG_SYSVIPC
1338 struct sysv_sem sysvsem
;
1340 #ifdef CONFIG_DETECT_HUNG_TASK
1341 /* hung task detection */
1342 unsigned long last_switch_count
;
1344 /* CPU-specific state of this task */
1345 struct thread_struct thread
;
1346 /* filesystem information */
1347 struct fs_struct
*fs
;
1348 /* open file information */
1349 struct files_struct
*files
;
1351 struct nsproxy
*nsproxy
;
1352 /* signal handlers */
1353 struct signal_struct
*signal
;
1354 struct sighand_struct
*sighand
;
1356 sigset_t blocked
, real_blocked
;
1357 sigset_t saved_sigmask
; /* restored if set_restore_sigmask() was used */
1358 struct sigpending pending
;
1360 unsigned long sas_ss_sp
;
1362 int (*notifier
)(void *priv
);
1363 void *notifier_data
;
1364 sigset_t
*notifier_mask
;
1365 struct audit_context
*audit_context
;
1366 #ifdef CONFIG_AUDITSYSCALL
1368 unsigned int sessionid
;
1372 /* Thread group tracking */
1375 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1377 spinlock_t alloc_lock
;
1379 #ifdef CONFIG_GENERIC_HARDIRQS
1380 /* IRQ handler threads */
1381 struct irqaction
*irqaction
;
1384 /* Protection of the PI data structures: */
1387 #ifdef CONFIG_RT_MUTEXES
1388 /* PI waiters blocked on a rt_mutex held by this task */
1389 struct plist_head pi_waiters
;
1390 /* Deadlock detection and priority inheritance handling */
1391 struct rt_mutex_waiter
*pi_blocked_on
;
1394 #ifdef CONFIG_DEBUG_MUTEXES
1395 /* mutex deadlock detection */
1396 struct mutex_waiter
*blocked_on
;
1398 #ifdef CONFIG_TRACE_IRQFLAGS
1399 unsigned int irq_events
;
1400 int hardirqs_enabled
;
1401 unsigned long hardirq_enable_ip
;
1402 unsigned int hardirq_enable_event
;
1403 unsigned long hardirq_disable_ip
;
1404 unsigned int hardirq_disable_event
;
1405 int softirqs_enabled
;
1406 unsigned long softirq_disable_ip
;
1407 unsigned int softirq_disable_event
;
1408 unsigned long softirq_enable_ip
;
1409 unsigned int softirq_enable_event
;
1410 int hardirq_context
;
1411 int softirq_context
;
1413 #ifdef CONFIG_LOCKDEP
1414 # define MAX_LOCK_DEPTH 48UL
1417 unsigned int lockdep_recursion
;
1418 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1419 gfp_t lockdep_reclaim_gfp
;
1422 /* journalling filesystem info */
1425 /* stacked block device info */
1426 struct bio
*bio_list
, **bio_tail
;
1429 struct reclaim_state
*reclaim_state
;
1431 struct backing_dev_info
*backing_dev_info
;
1433 struct io_context
*io_context
;
1435 unsigned long ptrace_message
;
1436 siginfo_t
*last_siginfo
; /* For ptrace use. */
1437 struct task_io_accounting ioac
;
1438 #if defined(CONFIG_TASK_XACCT)
1439 u64 acct_rss_mem1
; /* accumulated rss usage */
1440 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1441 cputime_t acct_timexpd
; /* stime + utime since last update */
1443 #ifdef CONFIG_CPUSETS
1444 nodemask_t mems_allowed
; /* Protected by alloc_lock */
1445 int cpuset_mem_spread_rotor
;
1447 #ifdef CONFIG_CGROUPS
1448 /* Control Group info protected by css_set_lock */
1449 struct css_set
*cgroups
;
1450 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1451 struct list_head cg_list
;
1454 struct robust_list_head __user
*robust_list
;
1455 #ifdef CONFIG_COMPAT
1456 struct compat_robust_list_head __user
*compat_robust_list
;
1458 struct list_head pi_state_list
;
1459 struct futex_pi_state
*pi_state_cache
;
1461 #ifdef CONFIG_PERF_EVENTS
1462 struct perf_event_context
*perf_event_ctxp
;
1463 struct mutex perf_event_mutex
;
1464 struct list_head perf_event_list
;
1467 struct mempolicy
*mempolicy
; /* Protected by alloc_lock */
1470 atomic_t fs_excl
; /* holding fs exclusive resources */
1471 struct rcu_head rcu
;
1474 * cache last used pipe for splice
1476 struct pipe_inode_info
*splice_pipe
;
1477 #ifdef CONFIG_TASK_DELAY_ACCT
1478 struct task_delay_info
*delays
;
1480 #ifdef CONFIG_FAULT_INJECTION
1483 struct prop_local_single dirties
;
1484 #ifdef CONFIG_LATENCYTOP
1485 int latency_record_count
;
1486 struct latency_record latency_record
[LT_SAVECOUNT
];
1489 * time slack values; these are used to round up poll() and
1490 * select() etc timeout values. These are in nanoseconds.
1492 unsigned long timer_slack_ns
;
1493 unsigned long default_timer_slack_ns
;
1495 struct list_head
*scm_work_list
;
1496 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1497 /* Index of current stored adress in ret_stack */
1499 /* Stack of return addresses for return function tracing */
1500 struct ftrace_ret_stack
*ret_stack
;
1501 /* time stamp for last schedule */
1502 unsigned long long ftrace_timestamp
;
1504 * Number of functions that haven't been traced
1505 * because of depth overrun.
1507 atomic_t trace_overrun
;
1508 /* Pause for the tracing */
1509 atomic_t tracing_graph_pause
;
1511 #ifdef CONFIG_TRACING
1512 /* state flags for use by tracers */
1513 unsigned long trace
;
1514 /* bitmask of trace recursion */
1515 unsigned long trace_recursion
;
1516 #endif /* CONFIG_TRACING */
1519 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1520 #define tsk_cpumask(tsk) (&(tsk)->cpus_allowed)
1523 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1524 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1525 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1526 * values are inverted: lower p->prio value means higher priority.
1528 * The MAX_USER_RT_PRIO value allows the actual maximum
1529 * RT priority to be separate from the value exported to
1530 * user-space. This allows kernel threads to set their
1531 * priority to a value higher than any user task. Note:
1532 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1535 #define MAX_USER_RT_PRIO 100
1536 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1538 #define MAX_PRIO (MAX_RT_PRIO + 40)
1539 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1541 static inline int rt_prio(int prio
)
1543 if (unlikely(prio
< MAX_RT_PRIO
))
1548 static inline int rt_task(struct task_struct
*p
)
1550 return rt_prio(p
->prio
);
1553 static inline struct pid
*task_pid(struct task_struct
*task
)
1555 return task
->pids
[PIDTYPE_PID
].pid
;
1558 static inline struct pid
*task_tgid(struct task_struct
*task
)
1560 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1564 * Without tasklist or rcu lock it is not safe to dereference
1565 * the result of task_pgrp/task_session even if task == current,
1566 * we can race with another thread doing sys_setsid/sys_setpgid.
1568 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1570 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1573 static inline struct pid
*task_session(struct task_struct
*task
)
1575 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1578 struct pid_namespace
;
1581 * the helpers to get the task's different pids as they are seen
1582 * from various namespaces
1584 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1585 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1587 * task_xid_nr_ns() : id seen from the ns specified;
1589 * set_task_vxid() : assigns a virtual id to a task;
1591 * see also pid_nr() etc in include/linux/pid.h
1593 pid_t
__task_pid_nr_ns(struct task_struct
*task
, enum pid_type type
,
1594 struct pid_namespace
*ns
);
1596 static inline pid_t
task_pid_nr(struct task_struct
*tsk
)
1601 static inline pid_t
task_pid_nr_ns(struct task_struct
*tsk
,
1602 struct pid_namespace
*ns
)
1604 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, ns
);
1607 static inline pid_t
task_pid_vnr(struct task_struct
*tsk
)
1609 return __task_pid_nr_ns(tsk
, PIDTYPE_PID
, NULL
);
1613 static inline pid_t
task_tgid_nr(struct task_struct
*tsk
)
1618 pid_t
task_tgid_nr_ns(struct task_struct
*tsk
, struct pid_namespace
*ns
);
1620 static inline pid_t
task_tgid_vnr(struct task_struct
*tsk
)
1622 return pid_vnr(task_tgid(tsk
));
1626 static inline pid_t
task_pgrp_nr_ns(struct task_struct
*tsk
,
1627 struct pid_namespace
*ns
)
1629 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, ns
);
1632 static inline pid_t
task_pgrp_vnr(struct task_struct
*tsk
)
1634 return __task_pid_nr_ns(tsk
, PIDTYPE_PGID
, NULL
);
1638 static inline pid_t
task_session_nr_ns(struct task_struct
*tsk
,
1639 struct pid_namespace
*ns
)
1641 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, ns
);
1644 static inline pid_t
task_session_vnr(struct task_struct
*tsk
)
1646 return __task_pid_nr_ns(tsk
, PIDTYPE_SID
, NULL
);
1649 /* obsolete, do not use */
1650 static inline pid_t
task_pgrp_nr(struct task_struct
*tsk
)
1652 return task_pgrp_nr_ns(tsk
, &init_pid_ns
);
1656 * pid_alive - check that a task structure is not stale
1657 * @p: Task structure to be checked.
1659 * Test if a process is not yet dead (at most zombie state)
1660 * If pid_alive fails, then pointers within the task structure
1661 * can be stale and must not be dereferenced.
1663 static inline int pid_alive(struct task_struct
*p
)
1665 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1669 * is_global_init - check if a task structure is init
1670 * @tsk: Task structure to be checked.
1672 * Check if a task structure is the first user space task the kernel created.
1674 static inline int is_global_init(struct task_struct
*tsk
)
1676 return tsk
->pid
== 1;
1680 * is_container_init:
1681 * check whether in the task is init in its own pid namespace.
1683 extern int is_container_init(struct task_struct
*tsk
);
1685 extern struct pid
*cad_pid
;
1687 extern void free_task(struct task_struct
*tsk
);
1688 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1690 extern void __put_task_struct(struct task_struct
*t
);
1692 static inline void put_task_struct(struct task_struct
*t
)
1694 if (atomic_dec_and_test(&t
->usage
))
1695 __put_task_struct(t
);
1698 extern cputime_t
task_utime(struct task_struct
*p
);
1699 extern cputime_t
task_stime(struct task_struct
*p
);
1700 extern cputime_t
task_gtime(struct task_struct
*p
);
1705 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1706 /* Not implemented yet, only for 486*/
1707 #define PF_STARTING 0x00000002 /* being created */
1708 #define PF_EXITING 0x00000004 /* getting shut down */
1709 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1710 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1711 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1712 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1713 #define PF_DUMPCORE 0x00000200 /* dumped core */
1714 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1715 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1716 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1717 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1718 #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */
1719 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1720 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1721 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1722 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1723 #define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */
1724 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1725 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1726 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1727 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1728 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1729 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1730 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1731 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1732 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1733 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1734 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1737 * Only the _current_ task can read/write to tsk->flags, but other
1738 * tasks can access tsk->flags in readonly mode for example
1739 * with tsk_used_math (like during threaded core dumping).
1740 * There is however an exception to this rule during ptrace
1741 * or during fork: the ptracer task is allowed to write to the
1742 * child->flags of its traced child (same goes for fork, the parent
1743 * can write to the child->flags), because we're guaranteed the
1744 * child is not running and in turn not changing child->flags
1745 * at the same time the parent does it.
1747 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1748 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1749 #define clear_used_math() clear_stopped_child_used_math(current)
1750 #define set_used_math() set_stopped_child_used_math(current)
1751 #define conditional_stopped_child_used_math(condition, child) \
1752 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1753 #define conditional_used_math(condition) \
1754 conditional_stopped_child_used_math(condition, current)
1755 #define copy_to_stopped_child_used_math(child) \
1756 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1757 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1758 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1759 #define used_math() tsk_used_math(current)
1761 #ifdef CONFIG_TREE_PREEMPT_RCU
1763 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1764 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1766 static inline void rcu_copy_process(struct task_struct
*p
)
1768 p
->rcu_read_lock_nesting
= 0;
1769 p
->rcu_read_unlock_special
= 0;
1770 p
->rcu_blocked_node
= NULL
;
1771 INIT_LIST_HEAD(&p
->rcu_node_entry
);
1776 static inline void rcu_copy_process(struct task_struct
*p
)
1783 extern int set_cpus_allowed_ptr(struct task_struct
*p
,
1784 const struct cpumask
*new_mask
);
1786 static inline int set_cpus_allowed_ptr(struct task_struct
*p
,
1787 const struct cpumask
*new_mask
)
1789 if (!cpumask_test_cpu(0, new_mask
))
1794 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1796 return set_cpus_allowed_ptr(p
, &new_mask
);
1800 * Architectures can set this to 1 if they have specified
1801 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1802 * but then during bootup it turns out that sched_clock()
1803 * is reliable after all:
1805 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1806 extern int sched_clock_stable
;
1809 extern unsigned long long sched_clock(void);
1811 extern void sched_clock_init(void);
1812 extern u64
sched_clock_cpu(int cpu
);
1814 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1815 static inline void sched_clock_tick(void)
1819 static inline void sched_clock_idle_sleep_event(void)
1823 static inline void sched_clock_idle_wakeup_event(u64 delta_ns
)
1827 extern void sched_clock_tick(void);
1828 extern void sched_clock_idle_sleep_event(void);
1829 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1833 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1834 * clock constructed from sched_clock():
1836 extern unsigned long long cpu_clock(int cpu
);
1838 extern unsigned long long
1839 task_sched_runtime(struct task_struct
*task
);
1840 extern unsigned long long thread_group_sched_runtime(struct task_struct
*task
);
1842 /* sched_exec is called by processes performing an exec */
1844 extern void sched_exec(void);
1846 #define sched_exec() {}
1849 extern void sched_clock_idle_sleep_event(void);
1850 extern void sched_clock_idle_wakeup_event(u64 delta_ns
);
1852 #ifdef CONFIG_HOTPLUG_CPU
1853 extern void idle_task_exit(void);
1855 static inline void idle_task_exit(void) {}
1858 extern void sched_idle_next(void);
1860 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1861 extern void wake_up_idle_cpu(int cpu
);
1863 static inline void wake_up_idle_cpu(int cpu
) { }
1866 extern unsigned int sysctl_sched_latency
;
1867 extern unsigned int sysctl_sched_min_granularity
;
1868 extern unsigned int sysctl_sched_wakeup_granularity
;
1869 extern unsigned int sysctl_sched_shares_ratelimit
;
1870 extern unsigned int sysctl_sched_shares_thresh
;
1871 extern unsigned int sysctl_sched_child_runs_first
;
1872 #ifdef CONFIG_SCHED_DEBUG
1873 extern unsigned int sysctl_sched_features
;
1874 extern unsigned int sysctl_sched_migration_cost
;
1875 extern unsigned int sysctl_sched_nr_migrate
;
1876 extern unsigned int sysctl_sched_time_avg
;
1877 extern unsigned int sysctl_timer_migration
;
1879 int sched_nr_latency_handler(struct ctl_table
*table
, int write
,
1880 struct file
*file
, void __user
*buffer
, size_t *length
,
1883 #ifdef CONFIG_SCHED_DEBUG
1884 static inline unsigned int get_sysctl_timer_migration(void)
1886 return sysctl_timer_migration
;
1889 static inline unsigned int get_sysctl_timer_migration(void)
1894 extern unsigned int sysctl_sched_rt_period
;
1895 extern int sysctl_sched_rt_runtime
;
1897 int sched_rt_handler(struct ctl_table
*table
, int write
,
1898 struct file
*filp
, void __user
*buffer
, size_t *lenp
,
1901 extern unsigned int sysctl_sched_compat_yield
;
1903 #ifdef CONFIG_RT_MUTEXES
1904 extern int rt_mutex_getprio(struct task_struct
*p
);
1905 extern void rt_mutex_setprio(struct task_struct
*p
, int prio
);
1906 extern void rt_mutex_adjust_pi(struct task_struct
*p
);
1908 static inline int rt_mutex_getprio(struct task_struct
*p
)
1910 return p
->normal_prio
;
1912 # define rt_mutex_adjust_pi(p) do { } while (0)
1915 extern void set_user_nice(struct task_struct
*p
, long nice
);
1916 extern int task_prio(const struct task_struct
*p
);
1917 extern int task_nice(const struct task_struct
*p
);
1918 extern int can_nice(const struct task_struct
*p
, const int nice
);
1919 extern int task_curr(const struct task_struct
*p
);
1920 extern int idle_cpu(int cpu
);
1921 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
1922 extern int sched_setscheduler_nocheck(struct task_struct
*, int,
1923 struct sched_param
*);
1924 extern struct task_struct
*idle_task(int cpu
);
1925 extern struct task_struct
*curr_task(int cpu
);
1926 extern void set_curr_task(int cpu
, struct task_struct
*p
);
1931 * The default (Linux) execution domain.
1933 extern struct exec_domain default_exec_domain
;
1935 union thread_union
{
1936 struct thread_info thread_info
;
1937 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1940 #ifndef __HAVE_ARCH_KSTACK_END
1941 static inline int kstack_end(void *addr
)
1943 /* Reliable end of stack detection:
1944 * Some APM bios versions misalign the stack
1946 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1950 extern union thread_union init_thread_union
;
1951 extern struct task_struct init_task
;
1953 extern struct mm_struct init_mm
;
1955 extern struct pid_namespace init_pid_ns
;
1958 * find a task by one of its numerical ids
1960 * find_task_by_pid_ns():
1961 * finds a task by its pid in the specified namespace
1962 * find_task_by_vpid():
1963 * finds a task by its virtual pid
1965 * see also find_vpid() etc in include/linux/pid.h
1968 extern struct task_struct
*find_task_by_vpid(pid_t nr
);
1969 extern struct task_struct
*find_task_by_pid_ns(pid_t nr
,
1970 struct pid_namespace
*ns
);
1972 extern void __set_special_pids(struct pid
*pid
);
1974 /* per-UID process charging. */
1975 extern struct user_struct
* alloc_uid(struct user_namespace
*, uid_t
);
1976 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1978 atomic_inc(&u
->__count
);
1981 extern void free_uid(struct user_struct
*);
1982 extern void release_uids(struct user_namespace
*ns
);
1984 #include <asm/current.h>
1986 extern void do_timer(unsigned long ticks
);
1988 extern int wake_up_state(struct task_struct
*tsk
, unsigned int state
);
1989 extern int wake_up_process(struct task_struct
*tsk
);
1990 extern void wake_up_new_task(struct task_struct
*tsk
,
1991 unsigned long clone_flags
);
1993 extern void kick_process(struct task_struct
*tsk
);
1995 static inline void kick_process(struct task_struct
*tsk
) { }
1997 extern void sched_fork(struct task_struct
*p
, int clone_flags
);
1998 extern void sched_dead(struct task_struct
*p
);
2000 extern void proc_caches_init(void);
2001 extern void flush_signals(struct task_struct
*);
2002 extern void __flush_signals(struct task_struct
*);
2003 extern void ignore_signals(struct task_struct
*);
2004 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
2005 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
2007 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
2009 unsigned long flags
;
2012 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
2013 ret
= dequeue_signal(tsk
, mask
, info
);
2014 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
2019 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
2021 extern void unblock_all_signals(void);
2022 extern void release_task(struct task_struct
* p
);
2023 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
2024 extern int force_sigsegv(int, struct task_struct
*);
2025 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
2026 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
2027 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
2028 extern int kill_pid_info_as_uid(int, struct siginfo
*, struct pid
*, uid_t
, uid_t
, u32
);
2029 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
2030 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
2031 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
2032 extern int do_notify_parent(struct task_struct
*, int);
2033 extern void force_sig(int, struct task_struct
*);
2034 extern void force_sig_specific(int, struct task_struct
*);
2035 extern int send_sig(int, struct task_struct
*, int);
2036 extern void zap_other_threads(struct task_struct
*p
);
2037 extern struct sigqueue
*sigqueue_alloc(void);
2038 extern void sigqueue_free(struct sigqueue
*);
2039 extern int send_sigqueue(struct sigqueue
*, struct task_struct
*, int group
);
2040 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
2041 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
2043 static inline int kill_cad_pid(int sig
, int priv
)
2045 return kill_pid(cad_pid
, sig
, priv
);
2048 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2049 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2050 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2051 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2053 static inline int is_si_special(const struct siginfo
*info
)
2055 return info
<= SEND_SIG_FORCED
;
2058 /* True if we are on the alternate signal stack. */
2060 static inline int on_sig_stack(unsigned long sp
)
2062 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
2065 static inline int sas_ss_flags(unsigned long sp
)
2067 return (current
->sas_ss_size
== 0 ? SS_DISABLE
2068 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
2072 * Routines for handling mm_structs
2074 extern struct mm_struct
* mm_alloc(void);
2076 /* mmdrop drops the mm and the page tables */
2077 extern void __mmdrop(struct mm_struct
*);
2078 static inline void mmdrop(struct mm_struct
* mm
)
2080 if (unlikely(atomic_dec_and_test(&mm
->mm_count
)))
2084 /* mmput gets rid of the mappings and all user-space */
2085 extern void mmput(struct mm_struct
*);
2086 /* Grab a reference to a task's mm, if it is not already going away */
2087 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
2088 /* Remove the current tasks stale references to the old mm_struct */
2089 extern void mm_release(struct task_struct
*, struct mm_struct
*);
2090 /* Allocate a new mm structure and copy contents from tsk->mm */
2091 extern struct mm_struct
*dup_mm(struct task_struct
*tsk
);
2093 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2094 struct task_struct
*, struct pt_regs
*);
2095 extern void flush_thread(void);
2096 extern void exit_thread(void);
2098 extern void exit_files(struct task_struct
*);
2099 extern void __cleanup_signal(struct signal_struct
*);
2100 extern void __cleanup_sighand(struct sighand_struct
*);
2102 extern void exit_itimers(struct signal_struct
*);
2103 extern void flush_itimer_signals(void);
2105 extern NORET_TYPE
void do_group_exit(int);
2107 extern void daemonize(const char *, ...);
2108 extern int allow_signal(int);
2109 extern int disallow_signal(int);
2111 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
2112 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
2113 struct task_struct
*fork_idle(int);
2115 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
2116 extern char *get_task_comm(char *to
, struct task_struct
*tsk
);
2119 extern void wait_task_context_switch(struct task_struct
*p
);
2120 extern unsigned long wait_task_inactive(struct task_struct
*, long match_state
);
2122 static inline void wait_task_context_switch(struct task_struct
*p
) {}
2123 static inline unsigned long wait_task_inactive(struct task_struct
*p
,
2130 #define next_task(p) \
2131 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2133 #define for_each_process(p) \
2134 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2136 extern bool current_is_single_threaded(void);
2139 * Careful: do_each_thread/while_each_thread is a double loop so
2140 * 'break' will not work as expected - use goto instead.
2142 #define do_each_thread(g, t) \
2143 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2145 #define while_each_thread(g, t) \
2146 while ((t = next_thread(t)) != g)
2148 /* de_thread depends on thread_group_leader not being a pid based check */
2149 #define thread_group_leader(p) (p == p->group_leader)
2151 /* Do to the insanities of de_thread it is possible for a process
2152 * to have the pid of the thread group leader without actually being
2153 * the thread group leader. For iteration through the pids in proc
2154 * all we care about is that we have a task with the appropriate
2155 * pid, we don't actually care if we have the right task.
2157 static inline int has_group_leader_pid(struct task_struct
*p
)
2159 return p
->pid
== p
->tgid
;
2163 int same_thread_group(struct task_struct
*p1
, struct task_struct
*p2
)
2165 return p1
->tgid
== p2
->tgid
;
2168 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
2170 return list_entry_rcu(p
->thread_group
.next
,
2171 struct task_struct
, thread_group
);
2174 static inline int thread_group_empty(struct task_struct
*p
)
2176 return list_empty(&p
->thread_group
);
2179 #define delay_group_leader(p) \
2180 (thread_group_leader(p) && !thread_group_empty(p))
2182 static inline int task_detached(struct task_struct
*p
)
2184 return p
->exit_signal
== -1;
2188 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2189 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2190 * pins the final release of task.io_context. Also protects ->cpuset and
2191 * ->cgroup.subsys[].
2193 * Nests both inside and outside of read_lock(&tasklist_lock).
2194 * It must not be nested with write_lock_irq(&tasklist_lock),
2195 * neither inside nor outside.
2197 static inline void task_lock(struct task_struct
*p
)
2199 spin_lock(&p
->alloc_lock
);
2202 static inline void task_unlock(struct task_struct
*p
)
2204 spin_unlock(&p
->alloc_lock
);
2207 extern struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
2208 unsigned long *flags
);
2210 static inline void unlock_task_sighand(struct task_struct
*tsk
,
2211 unsigned long *flags
)
2213 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
2216 #ifndef __HAVE_THREAD_FUNCTIONS
2218 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2219 #define task_stack_page(task) ((task)->stack)
2221 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
2223 *task_thread_info(p
) = *task_thread_info(org
);
2224 task_thread_info(p
)->task
= p
;
2227 static inline unsigned long *end_of_stack(struct task_struct
*p
)
2229 return (unsigned long *)(task_thread_info(p
) + 1);
2234 static inline int object_is_on_stack(void *obj
)
2236 void *stack
= task_stack_page(current
);
2238 return (obj
>= stack
) && (obj
< (stack
+ THREAD_SIZE
));
2241 extern void thread_info_cache_init(void);
2243 #ifdef CONFIG_DEBUG_STACK_USAGE
2244 static inline unsigned long stack_not_used(struct task_struct
*p
)
2246 unsigned long *n
= end_of_stack(p
);
2248 do { /* Skip over canary */
2252 return (unsigned long)n
- (unsigned long)end_of_stack(p
);
2256 /* set thread flags in other task's structures
2257 * - see asm/thread_info.h for TIF_xxxx flags available
2259 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2261 set_ti_thread_flag(task_thread_info(tsk
), flag
);
2264 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2266 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2269 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2271 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
2274 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2276 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
2279 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
2281 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
2284 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
2286 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2289 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
2291 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
2294 static inline int test_tsk_need_resched(struct task_struct
*tsk
)
2296 return unlikely(test_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
));
2299 static inline int restart_syscall(void)
2301 set_tsk_thread_flag(current
, TIF_SIGPENDING
);
2302 return -ERESTARTNOINTR
;
2305 static inline int signal_pending(struct task_struct
*p
)
2307 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
2310 extern int __fatal_signal_pending(struct task_struct
*p
);
2312 static inline int fatal_signal_pending(struct task_struct
*p
)
2314 return signal_pending(p
) && __fatal_signal_pending(p
);
2317 static inline int signal_pending_state(long state
, struct task_struct
*p
)
2319 if (!(state
& (TASK_INTERRUPTIBLE
| TASK_WAKEKILL
)))
2321 if (!signal_pending(p
))
2324 return (state
& TASK_INTERRUPTIBLE
) || __fatal_signal_pending(p
);
2327 static inline int need_resched(void)
2329 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
2333 * cond_resched() and cond_resched_lock(): latency reduction via
2334 * explicit rescheduling in places that are safe. The return
2335 * value indicates whether a reschedule was done in fact.
2336 * cond_resched_lock() will drop the spinlock before scheduling,
2337 * cond_resched_softirq() will enable bhs before scheduling.
2339 extern int _cond_resched(void);
2341 #define cond_resched() ({ \
2342 __might_sleep(__FILE__, __LINE__, 0); \
2346 extern int __cond_resched_lock(spinlock_t
*lock
);
2348 #ifdef CONFIG_PREEMPT
2349 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2351 #define PREEMPT_LOCK_OFFSET 0
2354 #define cond_resched_lock(lock) ({ \
2355 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2356 __cond_resched_lock(lock); \
2359 extern int __cond_resched_softirq(void);
2361 #define cond_resched_softirq() ({ \
2362 __might_sleep(__FILE__, __LINE__, SOFTIRQ_OFFSET); \
2363 __cond_resched_softirq(); \
2367 * Does a critical section need to be broken due to another
2368 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2369 * but a general need for low latency)
2371 static inline int spin_needbreak(spinlock_t
*lock
)
2373 #ifdef CONFIG_PREEMPT
2374 return spin_is_contended(lock
);
2381 * Thread group CPU time accounting.
2383 void thread_group_cputime(struct task_struct
*tsk
, struct task_cputime
*times
);
2384 void thread_group_cputimer(struct task_struct
*tsk
, struct task_cputime
*times
);
2386 static inline void thread_group_cputime_init(struct signal_struct
*sig
)
2388 sig
->cputimer
.cputime
= INIT_CPUTIME
;
2389 spin_lock_init(&sig
->cputimer
.lock
);
2390 sig
->cputimer
.running
= 0;
2393 static inline void thread_group_cputime_free(struct signal_struct
*sig
)
2398 * Reevaluate whether the task has signals pending delivery.
2399 * Wake the task if so.
2400 * This is required every time the blocked sigset_t changes.
2401 * callers must hold sighand->siglock.
2403 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
2404 extern void recalc_sigpending(void);
2406 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
2409 * Wrappers for p->thread_info->cpu access. No-op on UP.
2413 static inline unsigned int task_cpu(const struct task_struct
*p
)
2415 return task_thread_info(p
)->cpu
;
2418 extern void set_task_cpu(struct task_struct
*p
, unsigned int cpu
);
2422 static inline unsigned int task_cpu(const struct task_struct
*p
)
2427 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
2431 #endif /* CONFIG_SMP */
2433 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
2435 #ifdef CONFIG_TRACING
2437 __trace_special(void *__tr
, void *__data
,
2438 unsigned long arg1
, unsigned long arg2
, unsigned long arg3
);
2441 __trace_special(void *__tr
, void *__data
,
2442 unsigned long arg1
, unsigned long arg2
, unsigned long arg3
)
2447 extern long sched_setaffinity(pid_t pid
, const struct cpumask
*new_mask
);
2448 extern long sched_getaffinity(pid_t pid
, struct cpumask
*mask
);
2450 extern void normalize_rt_tasks(void);
2452 #ifdef CONFIG_GROUP_SCHED
2454 extern struct task_group init_task_group
;
2455 #ifdef CONFIG_USER_SCHED
2456 extern struct task_group root_task_group
;
2457 extern void set_tg_uid(struct user_struct
*user
);
2460 extern struct task_group
*sched_create_group(struct task_group
*parent
);
2461 extern void sched_destroy_group(struct task_group
*tg
);
2462 extern void sched_move_task(struct task_struct
*tsk
);
2463 #ifdef CONFIG_FAIR_GROUP_SCHED
2464 extern int sched_group_set_shares(struct task_group
*tg
, unsigned long shares
);
2465 extern unsigned long sched_group_shares(struct task_group
*tg
);
2467 #ifdef CONFIG_RT_GROUP_SCHED
2468 extern int sched_group_set_rt_runtime(struct task_group
*tg
,
2469 long rt_runtime_us
);
2470 extern long sched_group_rt_runtime(struct task_group
*tg
);
2471 extern int sched_group_set_rt_period(struct task_group
*tg
,
2473 extern long sched_group_rt_period(struct task_group
*tg
);
2474 extern int sched_rt_can_attach(struct task_group
*tg
, struct task_struct
*tsk
);
2478 extern int task_can_switch_user(struct user_struct
*up
,
2479 struct task_struct
*tsk
);
2481 #ifdef CONFIG_TASK_XACCT
2482 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2484 tsk
->ioac
.rchar
+= amt
;
2487 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2489 tsk
->ioac
.wchar
+= amt
;
2492 static inline void inc_syscr(struct task_struct
*tsk
)
2497 static inline void inc_syscw(struct task_struct
*tsk
)
2502 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
2506 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
2510 static inline void inc_syscr(struct task_struct
*tsk
)
2514 static inline void inc_syscw(struct task_struct
*tsk
)
2519 #ifndef TASK_SIZE_OF
2520 #define TASK_SIZE_OF(tsk) TASK_SIZE
2524 * Call the function if the target task is executing on a CPU right now:
2526 extern void task_oncpu_function_call(struct task_struct
*p
,
2527 void (*func
) (void *info
), void *info
);
2530 #ifdef CONFIG_MM_OWNER
2531 extern void mm_update_next_owner(struct mm_struct
*mm
);
2532 extern void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
);
2534 static inline void mm_update_next_owner(struct mm_struct
*mm
)
2538 static inline void mm_init_owner(struct mm_struct
*mm
, struct task_struct
*p
)
2541 #endif /* CONFIG_MM_OWNER */
2543 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2545 #endif /* __KERNEL__ */