1 #ifndef _LINUX_SCHED_H
2 #define _LINUX_SCHED_H
3
4 /*
5 * cloning flags:
6 */
7 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
8 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
9 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
10 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
11 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
12 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
13 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
14 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
15 #define CLONE_THREAD 0x00010000 /* Same thread group? */
16 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
17 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
18 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
19 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
20 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
21 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
22 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
23 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
24 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
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 */
31
32 /*
33 * Scheduling policies
34 */
35 #define SCHED_NORMAL 0
36 #define SCHED_FIFO 1
37 #define SCHED_RR 2
38 #define SCHED_BATCH 3
39 /* SCHED_ISO: reserved but not implemented yet */
40 #define SCHED_IDLE 5
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
43
44 #ifdef __KERNEL__
45
46 struct ccs_domain_info;
47
48 struct sched_param {
49 int sched_priority;
50 };
51
52 #include <asm/param.h> /* for HZ */
53
54 #include <linux/capability.h>
55 #include <linux/threads.h>
56 #include <linux/kernel.h>
57 #include <linux/types.h>
58 #include <linux/timex.h>
59 #include <linux/jiffies.h>
60 #include <linux/rbtree.h>
61 #include <linux/thread_info.h>
62 #include <linux/cpumask.h>
63 #include <linux/errno.h>
64 #include <linux/nodemask.h>
65 #include <linux/mm_types.h>
66
67 #include <asm/system.h>
68 #include <asm/page.h>
69 #include <asm/ptrace.h>
70 #include <asm/cputime.h>
71
72 #include <linux/smp.h>
73 #include <linux/sem.h>
74 #include <linux/signal.h>
75 #include <linux/path.h>
76 #include <linux/compiler.h>
77 #include <linux/completion.h>
78 #include <linux/pid.h>
79 #include <linux/percpu.h>
80 #include <linux/topology.h>
81 #include <linux/proportions.h>
82 #include <linux/seccomp.h>
83 #include <linux/rcupdate.h>
84 #include <linux/rculist.h>
85 #include <linux/rtmutex.h>
86
87 #include <linux/time.h>
88 #include <linux/param.h>
89 #include <linux/resource.h>
90 #include <linux/timer.h>
91 #include <linux/hrtimer.h>
92 #include <linux/task_io_accounting.h>
93 #include <linux/kobject.h>
94 #include <linux/latencytop.h>
95 #include <linux/cred.h>
96
97 #include <asm/processor.h>
98
99 struct exec_domain;
100 struct futex_pi_state;
101 struct robust_list_head;
102 struct bio;
103 struct fs_struct;
104 struct bts_context;
105 struct perf_event_context;
106
107 /*
108 * List of flags we want to share for kernel threads,
109 * if only because they are not used by them anyway.
110 */
111 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
112
113 /*
114 * These are the constant used to fake the fixed-point load-average
115 * counting. Some notes:
116 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
117 * a load-average precision of 10 bits integer + 11 bits fractional
118 * - if you want to count load-averages more often, you need more
119 * precision, or rounding will get you. With 2-second counting freq,
120 * the EXP_n values would be 1981, 2034 and 2043 if still using only
121 * 11 bit fractions.
122 */
123 extern unsigned long avenrun[]; /* Load averages */
124 extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
125
126 #define FSHIFT 11 /* nr of bits of precision */
127 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
128 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
129 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
130 #define EXP_5 2014 /* 1/exp(5sec/5min) */
131 #define EXP_15 2037 /* 1/exp(5sec/15min) */
132
133 #define CALC_LOAD(load,exp,n) \
134 load *= exp; \
135 load += n*(FIXED_1-exp); \
136 load >>= FSHIFT;
137
138 extern unsigned long total_forks;
139 extern int nr_threads;
140 DECLARE_PER_CPU(unsigned long, process_counts);
141 extern int nr_processes(void);
142 extern unsigned long nr_running(void);
143 extern unsigned long nr_uninterruptible(void);
144 extern unsigned long nr_iowait(void);
145 extern unsigned long nr_iowait_cpu(void);
146 extern unsigned long this_cpu_load(void);
147
148
149 extern void calc_global_load(void);
150
151 extern unsigned long get_parent_ip(unsigned long addr);
152
153 struct seq_file;
154 struct cfs_rq;
155 struct task_group;
156 #ifdef CONFIG_SCHED_DEBUG
157 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
158 extern void proc_sched_set_task(struct task_struct *p);
159 extern void
160 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
161 #else
162 static inline void
163 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
164 {
165 }
166 static inline void proc_sched_set_task(struct task_struct *p)
167 {
168 }
169 static inline void
170 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
171 {
172 }
173 #endif
174
175 /*
176 * Task state bitmask. NOTE! These bits are also
177 * encoded in fs/proc/array.c: get_task_state().
178 *
179 * We have two separate sets of flags: task->state
180 * is about runnability, while task->exit_state are
181 * about the task exiting. Confusing, but this way
182 * modifying one set can't modify the other one by
183 * mistake.
184 */
185 #define TASK_RUNNING 0
186 #define TASK_INTERRUPTIBLE 1
187 #define TASK_UNINTERRUPTIBLE 2
188 #define __TASK_STOPPED 4
189 #define __TASK_TRACED 8
190 /* in tsk->exit_state */
191 #define EXIT_ZOMBIE 16
192 #define EXIT_DEAD 32
193 /* in tsk->state again */
194 #define TASK_DEAD 64
195 #define TASK_WAKEKILL 128
196 #define TASK_WAKING 256
197 #define TASK_STATE_MAX 512
198
199 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
200
201 extern char ___assert_task_state[1 - 2*!!(
202 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
203
204 /* Convenience macros for the sake of set_task_state */
205 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
206 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
207 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
208
209 /* Convenience macros for the sake of wake_up */
210 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
211 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
212
213 /* get_task_state() */
214 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
215 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
216 __TASK_TRACED)
217
218 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
219 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 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_FREEZING) == 0)
225
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))
230
231 /*
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
234 * actually sleep:
235 *
236 * set_current_state(TASK_UNINTERRUPTIBLE);
237 * if (do_i_need_to_sleep())
238 * schedule();
239 *
240 * If the caller does not need such serialisation then use __set_current_state()
241 */
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))
246
247 /* Task command name length */
248 #define TASK_COMM_LEN 16
249
250 #include <linux/spinlock.h>
251
252 /*
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
256 * a separate lock).
257 */
258 extern rwlock_t tasklist_lock;
259 extern spinlock_t mmlist_lock;
260
261 struct task_struct;
262
263 extern void sched_init(void);
264 extern void sched_init_smp(void);
265 extern asmlinkage void schedule_tail(struct task_struct *prev);
266 extern void init_idle(struct task_struct *idle, int cpu);
267 extern void init_idle_bootup_task(struct task_struct *idle);
268
269 extern int runqueue_is_locked(int cpu);
270 extern void task_rq_unlock_wait(struct task_struct *p);
271
272 extern cpumask_var_t nohz_cpu_mask;
273 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
274 extern int select_nohz_load_balancer(int cpu);
275 extern int get_nohz_load_balancer(void);
276 #else
277 static inline int select_nohz_load_balancer(int cpu)
278 {
279 return 0;
280 }
281 #endif
282
283 /*
284 * Only dump TASK_* tasks. (0 for all tasks)
285 */
286 extern void show_state_filter(unsigned long state_filter);
287
288 static inline void show_state(void)
289 {
290 show_state_filter(0);
291 }
292
293 extern void show_regs(struct pt_regs *);
294
295 /*
296 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
297 * task), SP is the stack pointer of the first frame that should be shown in the back
298 * trace (or NULL if the entire call-chain of the task should be shown).
299 */
300 extern void show_stack(struct task_struct *task, unsigned long *sp);
301
302 void io_schedule(void);
303 long io_schedule_timeout(long timeout);
304
305 extern void cpu_init (void);
306 extern void trap_init(void);
307 extern void update_process_times(int user);
308 extern void scheduler_tick(void);
309
310 extern void sched_show_task(struct task_struct *p);
311
312 #ifdef CONFIG_DETECT_SOFTLOCKUP
313 extern void softlockup_tick(void);
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_dosoftlockup_thresh(struct ctl_table *table, int write,
318 void __user *buffer,
319 size_t *lenp, loff_t *ppos);
320 extern unsigned int softlockup_panic;
321 extern int softlockup_thresh;
322 #else
323 static inline void softlockup_tick(void)
324 {
325 }
326 static inline void touch_softlockup_watchdog(void)
327 {
328 }
329 static inline void touch_softlockup_watchdog_sync(void)
330 {
331 }
332 static inline void touch_all_softlockup_watchdogs(void)
333 {
334 }
335 #endif
336
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,
343 void __user *buffer,
344 size_t *lenp, loff_t *ppos);
345 #endif
346
347 /* Attach to any functions which should be ignored in wchan output. */
348 #define __sched __attribute__((__section__(".sched.text")))
349
350 /* Linker adds these: start and end of __sched functions */
351 extern char __sched_text_start[], __sched_text_end[];
352
353 /* Is this address in the __sched functions? */
354 extern int in_sched_functions(unsigned long addr);
355
356 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
357 extern signed long schedule_timeout(signed long timeout);
358 extern signed long schedule_timeout_interruptible(signed long timeout);
359 extern signed long schedule_timeout_killable(signed long timeout);
360 extern signed long schedule_timeout_uninterruptible(signed long timeout);
361 asmlinkage void schedule(void);
362 extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner);
363
364 struct nsproxy;
365 struct user_namespace;
366
367 /*
368 * Default maximum number of active map areas, this limits the number of vmas
369 * per mm struct. Users can overwrite this number by sysctl but there is a
370 * problem.
371 *
372 * When a program's coredump is generated as ELF format, a section is created
373 * per a vma. In ELF, the number of sections is represented in unsigned short.
374 * This means the number of sections should be smaller than 65535 at coredump.
375 * Because the kernel adds some informative sections to a image of program at
376 * generating coredump, we need some margin. The number of extra sections is
377 * 1-3 now and depends on arch. We use "5" as safe margin, here.
378 */
379 #define MAPCOUNT_ELF_CORE_MARGIN (5)
380 #define DEFAULT_MAX_MAP_COUNT (USHORT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
381
382 extern int sysctl_max_map_count;
383
384 #include <linux/aio.h>
385
386 #ifdef CONFIG_MMU
387 extern void arch_pick_mmap_layout(struct mm_struct *mm);
388 extern unsigned long
389 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
390 unsigned long, unsigned long);
391 extern unsigned long
392 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
393 unsigned long len, unsigned long pgoff,
394 unsigned long flags);
395 extern void arch_unmap_area(struct mm_struct *, unsigned long);
396 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
397 #else
398 static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
399 #endif
400
401 #if USE_SPLIT_PTLOCKS
402 /*
403 * The mm counters are not protected by its page_table_lock,
404 * so must be incremented atomically.
405 */
406 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
407 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
408 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
409 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
410 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
411
412 #else /* !USE_SPLIT_PTLOCKS */
413 /*
414 * The mm counters are protected by its page_table_lock,
415 * so can be incremented directly.
416 */
417 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
418 #define get_mm_counter(mm, member) ((mm)->_##member)
419 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
420 #define inc_mm_counter(mm, member) (mm)->_##member++
421 #define dec_mm_counter(mm, member) (mm)->_##member--
422
423 #endif /* !USE_SPLIT_PTLOCKS */
424
425 #define get_mm_rss(mm) \
426 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
427 #define update_hiwater_rss(mm) do { \
428 unsigned long _rss = get_mm_rss(mm); \
429 if ((mm)->hiwater_rss < _rss) \
430 (mm)->hiwater_rss = _rss; \
431 } while (0)
432 #define update_hiwater_vm(mm) do { \
433 if ((mm)->hiwater_vm < (mm)->total_vm) \
434 (mm)->hiwater_vm = (mm)->total_vm; \
435 } while (0)
436
437 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)
438 {
439 return max(mm->hiwater_rss, get_mm_rss(mm));
440 }
441
442 static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
443 struct mm_struct *mm)
444 {
445 unsigned long hiwater_rss = get_mm_hiwater_rss(mm);
446
447 if (*maxrss < hiwater_rss)
448 *maxrss = hiwater_rss;
449 }
450
451 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm)
452 {
453 return max(mm->hiwater_vm, mm->total_vm);
454 }
455
456 extern void set_dumpable(struct mm_struct *mm, int value);
457 extern int get_dumpable(struct mm_struct *mm);
458
459 /* mm flags */
460 /* dumpable bits */
461 #define MMF_DUMPABLE 0 /* core dump is permitted */
462 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
463
464 #define MMF_DUMPABLE_BITS 2
465 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
466
467 /* coredump filter bits */
468 #define MMF_DUMP_ANON_PRIVATE 2
469 #define MMF_DUMP_ANON_SHARED 3
470 #define MMF_DUMP_MAPPED_PRIVATE 4
471 #define MMF_DUMP_MAPPED_SHARED 5
472 #define MMF_DUMP_ELF_HEADERS 6
473 #define MMF_DUMP_HUGETLB_PRIVATE 7
474 #define MMF_DUMP_HUGETLB_SHARED 8
475
476 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
477 #define MMF_DUMP_FILTER_BITS 7
478 #define MMF_DUMP_FILTER_MASK \
479 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
480 #define MMF_DUMP_FILTER_DEFAULT \
481 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
482 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
483
484 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
485 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
486 #else
487 # define MMF_DUMP_MASK_DEFAULT_ELF 0
488 #endif
489 /* leave room for more dump flags */
490 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
491
492 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
493
494 struct sighand_struct {
495 atomic_t count;
496 struct k_sigaction action[_NSIG];
497 spinlock_t siglock;
498 wait_queue_head_t signalfd_wqh;
499 };
500
501 struct pacct_struct {
502 int ac_flag;
503 long ac_exitcode;
504 unsigned long ac_mem;
505 cputime_t ac_utime, ac_stime;
506 unsigned long ac_minflt, ac_majflt;
507 };
508
509 struct cpu_itimer {
510 cputime_t expires;
511 cputime_t incr;
512 u32 error;
513 u32 incr_error;
514 };
515
516 /**
517 * struct task_cputime - collected CPU time counts
518 * @utime: time spent in user mode, in &cputime_t units
519 * @stime: time spent in kernel mode, in &cputime_t units
520 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
521 *
522 * This structure groups together three kinds of CPU time that are
523 * tracked for threads and thread groups. Most things considering
524 * CPU time want to group these counts together and treat all three
525 * of them in parallel.
526 */
527 struct task_cputime {
528 cputime_t utime;
529 cputime_t stime;
530 unsigned long long sum_exec_runtime;
531 };
532 /* Alternate field names when used to cache expirations. */
533 #define prof_exp stime
534 #define virt_exp utime
535 #define sched_exp sum_exec_runtime
536
537 #define INIT_CPUTIME \
538 (struct task_cputime) { \
539 .utime = cputime_zero, \
540 .stime = cputime_zero, \
541 .sum_exec_runtime = 0, \
542 }
543
544 /*
545 * Disable preemption until the scheduler is running.
546 * Reset by start_kernel()->sched_init()->init_idle().
547 *
548 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
549 * before the scheduler is active -- see should_resched().
550 */
551 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
552
553 /**
554 * struct thread_group_cputimer - thread group interval timer counts
555 * @cputime: thread group interval timers.
556 * @running: non-zero when there are timers running and
557 * @cputime receives updates.
558 * @lock: lock for fields in this struct.
559 *
560 * This structure contains the version of task_cputime, above, that is
561 * used for thread group CPU timer calculations.
562 */
563 struct thread_group_cputimer {
564 struct task_cputime cputime;
565 int running;
566 spinlock_t lock;
567 };
568
569 /*
570 * NOTE! "signal_struct" does not have it's own
571 * locking, because a shared signal_struct always
572 * implies a shared sighand_struct, so locking
573 * sighand_struct is always a proper superset of
574 * the locking of signal_struct.
575 */
576 struct signal_struct {
577 atomic_t count;
578 atomic_t live;
579
580 wait_queue_head_t wait_chldexit; /* for wait4() */
581
582 /* current thread group signal load-balancing target: */
583 struct task_struct *curr_target;
584
585 /* shared signal handling: */
586 struct sigpending shared_pending;
587
588 /* thread group exit support */
589 int group_exit_code;
590 /* overloaded:
591 * - notify group_exit_task when ->count is equal to notify_count
592 * - everyone except group_exit_task is stopped during signal delivery
593 * of fatal signals, group_exit_task processes the signal.
594 */
595 int notify_count;
596 struct task_struct *group_exit_task;
597
598 /* thread group stop support, overloads group_exit_code too */
599 int group_stop_count;
600 unsigned int flags; /* see SIGNAL_* flags below */
601
602 /* POSIX.1b Interval Timers */
603 struct list_head posix_timers;
604
605 /* ITIMER_REAL timer for the process */
606 struct hrtimer real_timer;
607 struct pid *leader_pid;
608 ktime_t it_real_incr;
609
610 /*
611 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
612 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
613 * values are defined to 0 and 1 respectively
614 */
615 struct cpu_itimer it[2];
616
617 /*
618 * Thread group totals for process CPU timers.
619 * See thread_group_cputimer(), et al, for details.
620 */
621 struct thread_group_cputimer cputimer;
622
623 /* Earliest-expiration cache. */
624 struct task_cputime cputime_expires;
625
626 struct list_head cpu_timers[3];
627
628 struct pid *tty_old_pgrp;
629
630 /* boolean value for session group leader */
631 int leader;
632
633 struct tty_struct *tty; /* NULL if no tty */
634
635 /*
636 * Cumulative resource counters for dead threads in the group,
637 * and for reaped dead child processes forked by this group.
638 * Live threads maintain their own counters and add to these
639 * in __exit_signal, except for the group leader.
640 */
641 cputime_t utime, stime, cutime, cstime;
642 cputime_t gtime;
643 cputime_t cgtime;
644 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
645 cputime_t prev_utime, prev_stime;
646 #endif
647 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
648 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
649 unsigned long inblock, oublock, cinblock, coublock;
650 unsigned long maxrss, cmaxrss;
651 struct task_io_accounting ioac;
652
653 /*
654 * Cumulative ns of schedule CPU time fo dead threads in the
655 * group, not including a zombie group leader, (This only differs
656 * from jiffies_to_ns(utime + stime) if sched_clock uses something
657 * other than jiffies.)
658 */
659 unsigned long long sum_sched_runtime;
660
661 /*
662 * We don't bother to synchronize most readers of this at all,
663 * because there is no reader checking a limit that actually needs
664 * to get both rlim_cur and rlim_max atomically, and either one
665 * alone is a single word that can safely be read normally.
666 * getrlimit/setrlimit use task_lock(current->group_leader) to
667 * protect this instead of the siglock, because they really
668 * have no need to disable irqs.
669 */
670 struct rlimit rlim[RLIM_NLIMITS];
671
672 #ifdef CONFIG_BSD_PROCESS_ACCT
673 struct pacct_struct pacct; /* per-process accounting information */
674 #endif
675 #ifdef CONFIG_TASKSTATS
676 struct taskstats *stats;
677 #endif
678 #ifdef CONFIG_AUDIT
679 unsigned audit_tty;
680 struct tty_audit_buf *tty_audit_buf;
681 #endif
682
683 int oom_adj; /* OOM kill score adjustment (bit shift) */
684 };
685
686 /* Context switch must be unlocked if interrupts are to be enabled */
687 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
688 # define __ARCH_WANT_UNLOCKED_CTXSW
689 #endif
690
691 /*
692 * Bits in flags field of signal_struct.
693 */
694 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
695 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
696 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
697 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
698 /*
699 * Pending notifications to parent.
700 */
701 #define SIGNAL_CLD_STOPPED 0x00000010
702 #define SIGNAL_CLD_CONTINUED 0x00000020
703 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
704
705 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
706
707 /* If true, all threads except ->group_exit_task have pending SIGKILL */
708 static inline int signal_group_exit(const struct signal_struct *sig)
709 {
710 return (sig->flags & SIGNAL_GROUP_EXIT) ||
711 (sig->group_exit_task != NULL);
712 }
713
714 /*
715 * Some day this will be a full-fledged user tracking system..
716 */
717 struct user_struct {
718 atomic_t __count; /* reference count */
719 atomic_t processes; /* How many processes does this user have? */
720 atomic_t files; /* How many open files does this user have? */
721 atomic_t sigpending; /* How many pending signals does this user have? */
722 #ifdef CONFIG_INOTIFY_USER
723 atomic_t inotify_watches; /* How many inotify watches does this user have? */
724 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
725 #endif
726 #ifdef CONFIG_EPOLL
727 atomic_t epoll_watches; /* The number of file descriptors currently watched */
728 #endif
729 #ifdef CONFIG_POSIX_MQUEUE
730 /* protected by mq_lock */
731 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
732 #endif
733 unsigned long locked_shm; /* How many pages of mlocked shm ? */
734
735 #ifdef CONFIG_KEYS
736 struct key *uid_keyring; /* UID specific keyring */
737 struct key *session_keyring; /* UID's default session keyring */
738 #endif
739
740 /* Hash table maintenance information */
741 struct hlist_node uidhash_node;
742 uid_t uid;
743 struct user_namespace *user_ns;
744
745 #ifdef CONFIG_USER_SCHED
746 struct task_group *tg;
747 #ifdef CONFIG_SYSFS
748 struct kobject kobj;
749 struct delayed_work work;
750 #endif
751 #endif
752
753 #ifdef CONFIG_PERF_EVENTS
754 atomic_long_t locked_vm;
755 #endif
756 };
757
758 extern int uids_sysfs_init(void);
759
760 extern struct user_struct *find_user(uid_t);
761
762 extern struct user_struct root_user;
763 #define INIT_USER (&root_user)
764
765
766 struct backing_dev_info;
767 struct reclaim_state;
768
769 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
770 struct sched_info {
771 /* cumulative counters */
772 unsigned long pcount; /* # of times run on this cpu */
773 unsigned long long run_delay; /* time spent waiting on a runqueue */
774
775 /* timestamps */
776 unsigned long long last_arrival,/* when we last ran on a cpu */
777 last_queued; /* when we were last queued to run */
778 #ifdef CONFIG_SCHEDSTATS
779 /* BKL stats */
780 unsigned int bkl_count;
781 #endif
782 };
783 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
784
785 #ifdef CONFIG_TASK_DELAY_ACCT
786 struct task_delay_info {
787 spinlock_t lock;
788 unsigned int flags; /* Private per-task flags */
789
790 /* For each stat XXX, add following, aligned appropriately
791 *
792 * struct timespec XXX_start, XXX_end;
793 * u64 XXX_delay;
794 * u32 XXX_count;
795 *
796 * Atomicity of updates to XXX_delay, XXX_count protected by
797 * single lock above (split into XXX_lock if contention is an issue).
798 */
799
800 /*
801 * XXX_count is incremented on every XXX operation, the delay
802 * associated with the operation is added to XXX_delay.
803 * XXX_delay contains the accumulated delay time in nanoseconds.
804 */
805 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
806 u64 blkio_delay; /* wait for sync block io completion */
807 u64 swapin_delay; /* wait for swapin block io completion */
808 u32 blkio_count; /* total count of the number of sync block */
809 /* io operations performed */
810 u32 swapin_count; /* total count of the number of swapin block */
811 /* io operations performed */
812
813 struct timespec freepages_start, freepages_end;
814 u64 freepages_delay; /* wait for memory reclaim */
815 u32 freepages_count; /* total count of memory reclaim */
816 };
817 #endif /* CONFIG_TASK_DELAY_ACCT */
818
819 static inline int sched_info_on(void)
820 {
821 #ifdef CONFIG_SCHEDSTATS
822 return 1;
823 #elif defined(CONFIG_TASK_DELAY_ACCT)
824 extern int delayacct_on;
825 return delayacct_on;
826 #else
827 return 0;
828 #endif
829 }
830
831 enum cpu_idle_type {
832 CPU_IDLE,
833 CPU_NOT_IDLE,
834 CPU_NEWLY_IDLE,
835 CPU_MAX_IDLE_TYPES
836 };
837
838 /*
839 * sched-domains (multiprocessor balancing) declarations:
840 */
841
842 /*
843 * Increase resolution of nice-level calculations:
844 */
845 #define SCHED_LOAD_SHIFT 10
846 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
847
848 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
849
850 #ifdef CONFIG_SMP
851 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
852 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
853 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
854 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
855 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
856 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
857 #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */
858 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
859 #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */
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
863 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
864
865 enum powersavings_balance_level {
866 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */
867 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package
868 * first for long running threads
869 */
870 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle
871 * cpu package for power savings
872 */
873 MAX_POWERSAVINGS_BALANCE_LEVELS
874 };
875
876 extern int sched_mc_power_savings, sched_smt_power_savings;
877
878 static inline int sd_balance_for_mc_power(void)
879 {
880 if (sched_smt_power_savings)
881 return SD_POWERSAVINGS_BALANCE;
882
883 return SD_PREFER_SIBLING;
884 }
885
886 static inline int sd_balance_for_package_power(void)
887 {
888 if (sched_mc_power_savings | sched_smt_power_savings)
889 return SD_POWERSAVINGS_BALANCE;
890
891 return SD_PREFER_SIBLING;
892 }
893
894 /*
895 * Optimise SD flags for power savings:
896 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
897 * Keep default SD flags if sched_{smt,mc}_power_saving=0
898 */
899
900 static inline int sd_power_saving_flags(void)
901 {
902 if (sched_mc_power_savings | sched_smt_power_savings)
903 return SD_BALANCE_NEWIDLE;
904
905 return 0;
906 }
907
908 struct sched_group {
909 struct sched_group *next; /* Must be a circular list */
910
911 /*
912 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
913 * single CPU.
914 */
915 unsigned int cpu_power;
916
917 /*
918 * The CPUs this group covers.
919 *
920 * NOTE: this field is variable length. (Allocated dynamically
921 * by attaching extra space to the end of the structure,
922 * depending on how many CPUs the kernel has booted up with)
923 *
924 * It is also be embedded into static data structures at build
925 * time. (See 'struct static_sched_group' in kernel/sched.c)
926 */
927 unsigned long cpumask[0];
928 };
929
930 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
931 {
932 return to_cpumask(sg->cpumask);
933 }
934
935 enum sched_domain_level {
936 SD_LV_NONE = 0,
937 SD_LV_SIBLING,
938 SD_LV_MC,
939 SD_LV_CPU,
940 SD_LV_NODE,
941 SD_LV_ALLNODES,
942 SD_LV_MAX
943 };
944
945 struct sched_domain_attr {
946 int relax_domain_level;
947 };
948
949 #define SD_ATTR_INIT (struct sched_domain_attr) { \
950 .relax_domain_level = -1, \
951 }
952
953 struct sched_domain {
954 /* These fields must be setup */
955 struct sched_domain *parent; /* top domain must be null terminated */
956 struct sched_domain *child; /* bottom domain must be null terminated */
957 struct sched_group *groups; /* the balancing groups of the domain */
958 unsigned long min_interval; /* Minimum balance interval ms */
959 unsigned long max_interval; /* Maximum balance interval ms */
960 unsigned int busy_factor; /* less balancing by factor if busy */
961 unsigned int imbalance_pct; /* No balance until over watermark */
962 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
963 unsigned int busy_idx;
964 unsigned int idle_idx;
965 unsigned int newidle_idx;
966 unsigned int wake_idx;
967 unsigned int forkexec_idx;
968 unsigned int smt_gain;
969 int flags; /* See SD_* */
970 enum sched_domain_level level;
971
972 /* Runtime fields. */
973 unsigned long last_balance; /* init to jiffies. units in jiffies */
974 unsigned int balance_interval; /* initialise to 1. units in ms. */
975 unsigned int nr_balance_failed; /* initialise to 0 */
976
977 u64 last_update;
978
979 #ifdef CONFIG_SCHEDSTATS
980 /* load_balance() stats */
981 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
982 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
983 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
984 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
985 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
986 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
987 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
988 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
989
990 /* Active load balancing */
991 unsigned int alb_count;
992 unsigned int alb_failed;
993 unsigned int alb_pushed;
994
995 /* SD_BALANCE_EXEC stats */
996 unsigned int sbe_count;
997 unsigned int sbe_balanced;
998 unsigned int sbe_pushed;
999
1000 /* SD_BALANCE_FORK stats */
1001 unsigned int sbf_count;
1002 unsigned int sbf_balanced;
1003 unsigned int sbf_pushed;
1004
1005 /* try_to_wake_up() stats */
1006 unsigned int ttwu_wake_remote;
1007 unsigned int ttwu_move_affine;
1008 unsigned int ttwu_move_balance;
1009 #endif
1010 #ifdef CONFIG_SCHED_DEBUG
1011 char *name;
1012 #endif
1013
1014 /*
1015 * Span of all CPUs in this domain.
1016 *
1017 * NOTE: this field is variable length. (Allocated dynamically
1018 * by attaching extra space to the end of the structure,
1019 * depending on how many CPUs the kernel has booted up with)
1020 *
1021 * It is also be embedded into static data structures at build
1022 * time. (See 'struct static_sched_domain' in kernel/sched.c)
1023 */
1024 unsigned long span[0];
1025 };
1026
1027 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
1028 {
1029 return to_cpumask(sd->span);
1030 }
1031
1032 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1033 struct sched_domain_attr *dattr_new);
1034
1035 /* Allocate an array of sched domains, for partition_sched_domains(). */
1036 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
1037 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
1038
1039 /* Test a flag in parent sched domain */
1040 static inline int test_sd_parent(struct sched_domain *sd, int flag)
1041 {
1042 if (sd->parent && (sd->parent->flags & flag))
1043 return 1;
1044
1045 return 0;
1046 }
1047
1048 unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
1049 unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
1050
1051 #else /* CONFIG_SMP */
1052
1053 struct sched_domain_attr;
1054
1055 static inline void
1056 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1057 struct sched_domain_attr *dattr_new)
1058 {
1059 }
1060 #endif /* !CONFIG_SMP */
1061
1062
1063 struct io_context; /* See blkdev.h */
1064
1065
1066 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1067 extern void prefetch_stack(struct task_struct *t);
1068 #else
1069 static inline void prefetch_stack(struct task_struct *t) { }
1070 #endif
1071
1072 struct audit_context; /* See audit.c */
1073 struct mempolicy;
1074 struct pipe_inode_info;
1075 struct uts_namespace;
1076
1077 struct rq;
1078 struct sched_domain;
1079
1080 /*
1081 * wake flags
1082 */
1083 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
1084 #define WF_FORK 0x02 /* child wakeup after fork */
1085
1086 struct sched_class {
1087 const struct sched_class *next;
1088
1089 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
1090 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
1091 void (*yield_task) (struct rq *rq);
1092
1093 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
1094
1095 struct task_struct * (*pick_next_task) (struct rq *rq);
1096 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
1097
1098 #ifdef CONFIG_SMP
1099 int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);
1100
1101 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
1102 struct rq *busiest, unsigned long max_load_move,
1103 struct sched_domain *sd, enum cpu_idle_type idle,
1104 int *all_pinned, int *this_best_prio);
1105
1106 int (*move_one_task) (struct rq *this_rq, int this_cpu,
1107 struct rq *busiest, struct sched_domain *sd,
1108 enum cpu_idle_type idle);
1109 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1110 void (*post_schedule) (struct rq *this_rq);
1111 void (*task_waking) (struct rq *this_rq, struct task_struct *task);
1112 void (*task_woken) (struct rq *this_rq, struct task_struct *task);
1113
1114 void (*set_cpus_allowed)(struct task_struct *p,
1115 const struct cpumask *newmask);
1116
1117 void (*rq_online)(struct rq *rq);
1118 void (*rq_offline)(struct rq *rq);
1119 #endif
1120
1121 void (*set_curr_task) (struct rq *rq);
1122 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1123 void (*task_fork) (struct task_struct *p);
1124
1125 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
1126 int running);
1127 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
1128 int running);
1129 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1130 int oldprio, int running);
1131
1132 unsigned int (*get_rr_interval) (struct rq *rq,
1133 struct task_struct *task);
1134
1135 #ifdef CONFIG_FAIR_GROUP_SCHED
1136 void (*moved_group) (struct task_struct *p, int on_rq);
1137 #endif
1138 };
1139
1140 struct load_weight {
1141 unsigned long weight, inv_weight;
1142 };
1143
1144 /*
1145 * CFS stats for a schedulable entity (task, task-group etc)
1146 *
1147 * Current field usage histogram:
1148 *
1149 * 4 se->block_start
1150 * 4 se->run_node
1151 * 4 se->sleep_start
1152 * 6 se->load.weight
1153 */
1154 struct sched_entity {
1155 struct load_weight load; /* for load-balancing */
1156 struct rb_node run_node;
1157 struct list_head group_node;
1158 unsigned int on_rq;
1159
1160 u64 exec_start;
1161 u64 sum_exec_runtime;
1162 u64 vruntime;
1163 u64 prev_sum_exec_runtime;
1164
1165 u64 last_wakeup;
1166 u64 avg_overlap;
1167
1168 u64 nr_migrations;
1169
1170 u64 start_runtime;
1171 u64 avg_wakeup;
1172
1173 #ifdef CONFIG_SCHEDSTATS
1174 u64 wait_start;
1175 u64 wait_max;
1176 u64 wait_count;
1177 u64 wait_sum;
1178 u64 iowait_count;
1179 u64 iowait_sum;
1180
1181 u64 sleep_start;
1182 u64 sleep_max;
1183 s64 sum_sleep_runtime;
1184
1185 u64 block_start;
1186 u64 block_max;
1187 u64 exec_max;
1188 u64 slice_max;
1189
1190 u64 nr_migrations_cold;
1191 u64 nr_failed_migrations_affine;
1192 u64 nr_failed_migrations_running;
1193 u64 nr_failed_migrations_hot;
1194 u64 nr_forced_migrations;
1195
1196 u64 nr_wakeups;
1197 u64 nr_wakeups_sync;
1198 u64 nr_wakeups_migrate;
1199 u64 nr_wakeups_local;
1200 u64 nr_wakeups_remote;
1201 u64 nr_wakeups_affine;
1202 u64 nr_wakeups_affine_attempts;
1203 u64 nr_wakeups_passive;
1204 u64 nr_wakeups_idle;
1205 #endif
1206
1207 #ifdef CONFIG_FAIR_GROUP_SCHED
1208 struct sched_entity *parent;
1209 /* rq on which this entity is (to be) queued: */
1210 struct cfs_rq *cfs_rq;
1211 /* rq "owned" by this entity/group: */
1212 struct cfs_rq *my_q;
1213 #endif
1214 };
1215
1216 struct sched_rt_entity {
1217 struct list_head run_list;
1218 unsigned long timeout;
1219 unsigned int time_slice;
1220 int nr_cpus_allowed;
1221
1222 struct sched_rt_entity *back;
1223 #ifdef CONFIG_RT_GROUP_SCHED
1224 struct sched_rt_entity *parent;
1225 /* rq on which this entity is (to be) queued: */
1226 struct rt_rq *rt_rq;
1227 /* rq "owned" by this entity/group: */
1228 struct rt_rq *my_q;
1229 #endif
1230 };
1231
1232 struct rcu_node;
1233
1234 struct task_struct {
1235 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1236 void *stack;
1237 atomic_t usage;
1238 unsigned int flags; /* per process flags, defined below */
1239 unsigned int ptrace;
1240
1241 int lock_depth; /* BKL lock depth */
1242
1243 #ifdef CONFIG_SMP
1244 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1245 int oncpu;
1246 #endif
1247 #endif
1248
1249 int prio, static_prio, normal_prio;
1250 unsigned int rt_priority;
1251 const struct sched_class *sched_class;
1252 struct sched_entity se;
1253 struct sched_rt_entity rt;
1254
1255 #ifdef CONFIG_PREEMPT_NOTIFIERS
1256 /* list of struct preempt_notifier: */
1257 struct hlist_head preempt_notifiers;
1258 #endif
1259
1260 /*
1261 * fpu_counter contains the number of consecutive context switches
1262 * that the FPU is used. If this is over a threshold, the lazy fpu
1263 * saving becomes unlazy to save the trap. This is an unsigned char
1264 * so that after 256 times the counter wraps and the behavior turns
1265 * lazy again; this to deal with bursty apps that only use FPU for
1266 * a short time
1267 */
1268 unsigned char fpu_counter;
1269 #ifdef CONFIG_BLK_DEV_IO_TRACE
1270 unsigned int btrace_seq;
1271 #endif
1272
1273 unsigned int policy;
1274 cpumask_t cpus_allowed;
1275
1276 #ifdef CONFIG_TREE_PREEMPT_RCU
1277 int rcu_read_lock_nesting;
1278 char rcu_read_unlock_special;
1279 struct rcu_node *rcu_blocked_node;
1280 struct list_head rcu_node_entry;
1281 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1282
1283 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1284 struct sched_info sched_info;
1285 #endif
1286
1287 struct list_head tasks;
1288 struct plist_node pushable_tasks;
1289
1290 struct mm_struct *mm, *active_mm;
1291
1292 /* task state */
1293 int exit_state;
1294 int exit_code, exit_signal;
1295 int pdeath_signal; /* The signal sent when the parent dies */
1296 /* ??? */
1297 unsigned int personality;
1298 unsigned did_exec:1;
1299 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1300 * execve */
1301 unsigned in_iowait:1;
1302
1303
1304 /* Revert to default priority/policy when forking */
1305 unsigned sched_reset_on_fork:1;
1306
1307 pid_t pid;
1308 pid_t tgid;
1309
1310 #ifdef CONFIG_CC_STACKPROTECTOR
1311 /* Canary value for the -fstack-protector gcc feature */
1312 unsigned long stack_canary;
1313 #endif
1314
1315 /*
1316 * pointers to (original) parent process, youngest child, younger sibling,
1317 * older sibling, respectively. (p->father can be replaced with
1318 * p->real_parent->pid)
1319 */
1320 struct task_struct *real_parent; /* real parent process */
1321 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1322 /*
1323 * children/sibling forms the list of my natural children
1324 */
1325 struct list_head children; /* list of my children */
1326 struct list_head sibling; /* linkage in my parent's children list */
1327 struct task_struct *group_leader; /* threadgroup leader */
1328
1329 /*
1330 * ptraced is the list of tasks this task is using ptrace on.
1331 * This includes both natural children and PTRACE_ATTACH targets.
1332 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1333 */
1334 struct list_head ptraced;
1335 struct list_head ptrace_entry;
1336
1337 /*
1338 * This is the tracer handle for the ptrace BTS extension.
1339 * This field actually belongs to the ptracer task.
1340 */
1341 struct bts_context *bts;
1342
1343 /* PID/PID hash table linkage. */
1344 struct pid_link pids[PIDTYPE_MAX];
1345 struct list_head thread_group;
1346
1347 struct completion *vfork_done; /* for vfork() */
1348 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1349 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1350
1351 cputime_t utime, stime, utimescaled, stimescaled;
1352 cputime_t gtime;
1353 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
1354 cputime_t prev_utime, prev_stime;
1355 #endif
1356 unsigned long nvcsw, nivcsw; /* context switch counts */
1357 struct timespec start_time; /* monotonic time */
1358 struct timespec real_start_time; /* boot based time */
1359 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1360 unsigned long min_flt, maj_flt;
1361
1362 struct task_cputime cputime_expires;
1363 struct list_head cpu_timers[3];
1364
1365 /* process credentials */
1366 const struct cred *real_cred; /* objective and real subjective task
1367 * credentials (COW) */
1368 const struct cred *cred; /* effective (overridable) subjective task
1369 * credentials (COW) */
1370 struct mutex cred_guard_mutex; /* guard against foreign influences on
1371 * credential calculations
1372 * (notably. ptrace) */
1373 struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
1374
1375 char comm[TASK_COMM_LEN]; /* executable name excluding path
1376 - access with [gs]et_task_comm (which lock
1377 it with task_lock())
1378 - initialized normally by setup_new_exec */
1379 /* file system info */
1380 int link_count, total_link_count;
1381 #ifdef CONFIG_SYSVIPC
1382 /* ipc stuff */
1383 struct sysv_sem sysvsem;
1384 #endif
1385 #ifdef CONFIG_DETECT_HUNG_TASK
1386 /* hung task detection */
1387 unsigned long last_switch_count;
1388 #endif
1389 /* CPU-specific state of this task */
1390 struct thread_struct thread;
1391 /* filesystem information */
1392 struct fs_struct *fs;
1393 /* open file information */
1394 struct files_struct *files;
1395 /* namespaces */
1396 struct nsproxy *nsproxy;
1397 /* signal handlers */
1398 struct signal_struct *signal;
1399 struct sighand_struct *sighand;
1400
1401 sigset_t blocked, real_blocked;
1402 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1403 struct sigpending pending;
1404
1405 unsigned long sas_ss_sp;
1406 size_t sas_ss_size;
1407 int (*notifier)(void *priv);
1408 void *notifier_data;
1409 sigset_t *notifier_mask;
1410 struct audit_context *audit_context;
1411 #ifdef CONFIG_AUDITSYSCALL
1412 uid_t loginuid;
1413 unsigned int sessionid;
1414 #endif
1415 seccomp_t seccomp;
1416
1417 /* Thread group tracking */
1418 u32 parent_exec_id;
1419 u32 self_exec_id;
1420 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1421 * mempolicy */
1422 spinlock_t alloc_lock;
1423
1424 #ifdef CONFIG_GENERIC_HARDIRQS
1425 /* IRQ handler threads */
1426 struct irqaction *irqaction;
1427 #endif
1428
1429 /* Protection of the PI data structures: */
1430 raw_spinlock_t pi_lock;
1431
1432 #ifdef CONFIG_RT_MUTEXES
1433 /* PI waiters blocked on a rt_mutex held by this task */
1434 struct plist_head pi_waiters;
1435 /* Deadlock detection and priority inheritance handling */
1436 struct rt_mutex_waiter *pi_blocked_on;
1437 #endif
1438
1439 #ifdef CONFIG_DEBUG_MUTEXES
1440 /* mutex deadlock detection */
1441 struct mutex_waiter *blocked_on;
1442 #endif
1443 #ifdef CONFIG_TRACE_IRQFLAGS
1444 unsigned int irq_events;
1445 unsigned long hardirq_enable_ip;
1446 unsigned long hardirq_disable_ip;
1447 unsigned int hardirq_enable_event;
1448 unsigned int hardirq_disable_event;
1449 int hardirqs_enabled;
1450 int hardirq_context;
1451 unsigned long softirq_disable_ip;
1452 unsigned long softirq_enable_ip;
1453 unsigned int softirq_disable_event;
1454 unsigned int softirq_enable_event;
1455 int softirqs_enabled;
1456 int softirq_context;
1457 #endif
1458 #ifdef CONFIG_LOCKDEP
1459 # define MAX_LOCK_DEPTH 48UL
1460 u64 curr_chain_key;
1461 int lockdep_depth;
1462 unsigned int lockdep_recursion;
1463 struct held_lock held_locks[MAX_LOCK_DEPTH];
1464 gfp_t lockdep_reclaim_gfp;
1465 #endif
1466
1467 /* journalling filesystem info */
1468 void *journal_info;
1469
1470 /* stacked block device info */
1471 struct bio *bio_list, **bio_tail;
1472
1473 /* VM state */
1474 struct reclaim_state *reclaim_state;
1475
1476 struct backing_dev_info *backing_dev_info;
1477
1478 struct io_context *io_context;
1479
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 */
1487 #endif
1488 #ifdef CONFIG_CPUSETS
1489 nodemask_t mems_allowed; /* Protected by alloc_lock */
1490 int cpuset_mem_spread_rotor;
1491 #endif
1492 #ifdef CONFIG_CGROUPS
1493 /* Control Group info protected by css_set_lock */
1494 struct css_set *cgroups;
1495 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1496 struct list_head cg_list;
1497 #endif
1498 #ifdef CONFIG_FUTEX
1499 struct robust_list_head __user *robust_list;
1500 #ifdef CONFIG_COMPAT
1501 struct compat_robust_list_head __user *compat_robust_list;
1502 #endif
1503 struct list_head pi_state_list;
1504 struct futex_pi_state *pi_state_cache;
1505 #endif
1506 #ifdef CONFIG_PERF_EVENTS
1507 struct perf_event_context *perf_event_ctxp;
1508 struct mutex perf_event_mutex;
1509 struct list_head perf_event_list;
1510 #endif
1511 #ifdef CONFIG_NUMA
1512 struct mempolicy *mempolicy; /* Protected by alloc_lock */
1513 short il_next;
1514 #endif
1515 atomic_t fs_excl; /* holding fs exclusive resources */
1516 struct rcu_head rcu;
1517
1518 /*
1519 * cache last used pipe for splice
1520 */
1521 struct pipe_inode_info *splice_pipe;
1522 #ifdef CONFIG_TASK_DELAY_ACCT
1523 struct task_delay_info *delays;
1524 #endif
1525 #ifdef CONFIG_FAULT_INJECTION
1526 int make_it_fail;
1527 #endif
1528 struct prop_local_single dirties;
1529 #ifdef CONFIG_LATENCYTOP
1530 int latency_record_count;
1531 struct latency_record latency_record[LT_SAVECOUNT];
1532 #endif
1533 /*
1534 * time slack values; these are used to round up poll() and
1535 * select() etc timeout values. These are in nanoseconds.
1536 */
1537 unsigned long timer_slack_ns;
1538 unsigned long default_timer_slack_ns;
1539
1540 struct list_head *scm_work_list;
1541 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1542 /* Index of current stored adress in ret_stack */
1543 int curr_ret_stack;
1544 /* Stack of return addresses for return function tracing */
1545 struct ftrace_ret_stack *ret_stack;
1546 /* time stamp for last schedule */
1547 unsigned long long ftrace_timestamp;
1548 /*
1549 * Number of functions that haven't been traced
1550 * because of depth overrun.
1551 */
1552 atomic_t trace_overrun;
1553 /* Pause for the tracing */
1554 atomic_t tracing_graph_pause;
1555 #endif
1556 #ifdef CONFIG_TRACING
1557 /* state flags for use by tracers */
1558 unsigned long trace;
1559 /* bitmask of trace recursion */
1560 unsigned long trace_recursion;
1561 #endif /* CONFIG_TRACING */
1562 unsigned long stack_start;
1563 #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
1564 struct memcg_batch_info {
1565 int do_batch; /* incremented when batch uncharge started */
1566 struct mem_cgroup *memcg; /* target memcg of uncharge */
1567 unsigned long bytes; /* uncharged usage */
1568 unsigned long memsw_bytes; /* uncharged mem+swap usage */
1569 } memcg_batch;
1570 #endif
1571 #ifdef CONFIG_CCSECURITY
1572 struct ccs_domain_info *ccs_domain_info;
1573 u32 ccs_flags;
1574 #endif
1575 };
1576
1577 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1578 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1579
1580 /*
1581 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1582 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1583 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1584 * values are inverted: lower p->prio value means higher priority.
1585 *
1586 * The MAX_USER_RT_PRIO value allows the actual maximum
1587 * RT priority to be separate from the value exported to
1588 * user-space. This allows kernel threads to set their
1589 * priority to a value higher than any user task. Note:
1590 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1591 */
1592
1593 #define MAX_USER_RT_PRIO 100
1594 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1595
1596 #define MAX_PRIO (MAX_RT_PRIO + 40)
1597 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1598
1599 static inline int rt_prio(int prio)
1600 {
1601 if (unlikely(prio < MAX_RT_PRIO))
1602 return 1;
1603 return 0;
1604 }
1605
1606 static inline int rt_task(struct task_struct *p)
1607 {
1608 return rt_prio(p->prio);
1609 }
1610
1611 static inline struct pid *task_pid(struct task_struct *task)
1612 {
1613 return task->pids[PIDTYPE_PID].pid;
1614 }
1615
1616 static inline struct pid *task_tgid(struct task_struct *task)
1617 {
1618 return task->group_leader->pids[PIDTYPE_PID].pid;
1619 }
1620
1621 /*
1622 * Without tasklist or rcu lock it is not safe to dereference
1623 * the result of task_pgrp/task_session even if task == current,
1624 * we can race with another thread doing sys_setsid/sys_setpgid.
1625 */
1626 static inline struct pid *task_pgrp(struct task_struct *task)
1627 {
1628 return task->group_leader->pids[PIDTYPE_PGID].pid;
1629 }
1630
1631 static inline struct pid *task_session(struct task_struct *task)
1632 {
1633 return task->group_leader->pids[PIDTYPE_SID].pid;
1634 }
1635
1636 struct pid_namespace;
1637
1638 /*
1639 * the helpers to get the task's different pids as they are seen
1640 * from various namespaces
1641 *
1642 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1643 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1644 * current.
1645 * task_xid_nr_ns() : id seen from the ns specified;
1646 *
1647 * set_task_vxid() : assigns a virtual id to a task;
1648 *
1649 * see also pid_nr() etc in include/linux/pid.h
1650 */
1651 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1652 struct pid_namespace *ns);
1653
1654 static inline pid_t task_pid_nr(struct task_struct *tsk)
1655 {
1656 return tsk->pid;
1657 }
1658
1659 static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1660 struct pid_namespace *ns)
1661 {
1662 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1663 }
1664
1665 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1666 {
1667 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1668 }
1669
1670
1671 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1672 {
1673 return tsk->tgid;
1674 }
1675
1676 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1677
1678 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1679 {
1680 return pid_vnr(task_tgid(tsk));
1681 }
1682
1683
1684 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1685 struct pid_namespace *ns)
1686 {
1687 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1688 }
1689
1690 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1691 {
1692 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1693 }
1694
1695
1696 static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1697 struct pid_namespace *ns)
1698 {
1699 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1700 }
1701
1702 static inline pid_t task_session_vnr(struct task_struct *tsk)
1703 {
1704 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1705 }
1706
1707 /* obsolete, do not use */
1708 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1709 {
1710 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1711 }
1712
1713 /**
1714 * pid_alive - check that a task structure is not stale
1715 * @p: Task structure to be checked.
1716 *
1717 * Test if a process is not yet dead (at most zombie state)
1718 * If pid_alive fails, then pointers within the task structure
1719 * can be stale and must not be dereferenced.
1720 */
1721 static inline int pid_alive(struct task_struct *p)
1722 {
1723 return p->pids[PIDTYPE_PID].pid != NULL;
1724 }
1725
1726 /**
1727 * is_global_init - check if a task structure is init
1728 * @tsk: Task structure to be checked.
1729 *
1730 * Check if a task structure is the first user space task the kernel created.
1731 */
1732 static inline int is_global_init(struct task_struct *tsk)
1733 {
1734 return tsk->pid == 1;
1735 }
1736
1737 /*
1738 * is_container_init:
1739 * check whether in the task is init in its own pid namespace.
1740 */
1741 extern int is_container_init(struct task_struct *tsk);
1742
1743 extern struct pid *cad_pid;
1744
1745 extern void free_task(struct task_struct *tsk);
1746 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1747
1748 extern void __put_task_struct(struct task_struct *t);
1749
1750 static inline void put_task_struct(struct task_struct *t)
1751 {
1752 if (atomic_dec_and_test(&t->usage))
1753 __put_task_struct(t);
1754 }
1755
1756 extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1757 extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1758
1759 /*
1760 * Per process flags
1761 */
1762 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1763 /* Not implemented yet, only for 486*/
1764 #define PF_STARTING 0x00000002 /* being created */
1765 #define PF_EXITING 0x00000004 /* getting shut down */
1766 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1767 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1768 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1769 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1770 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1771 #define PF_DUMPCORE 0x00000200 /* dumped core */
1772 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1773 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1774 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1775 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1776 #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */
1777 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1778 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1779 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1780 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1781 #define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */
1782 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1783 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1784 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1785 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1786 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1787 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1788 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1789 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1790 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1791 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1792 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1793 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1794
1795 /*
1796 * Only the _current_ task can read/write to tsk->flags, but other
1797 * tasks can access tsk->flags in readonly mode for example
1798 * with tsk_used_math (like during threaded core dumping).
1799 * There is however an exception to this rule during ptrace
1800 * or during fork: the ptracer task is allowed to write to the
1801 * child->flags of its traced child (same goes for fork, the parent
1802 * can write to the child->flags), because we're guaranteed the
1803 * child is not running and in turn not changing child->flags
1804 * at the same time the parent does it.
1805 */
1806 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1807 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1808 #define clear_used_math() clear_stopped_child_used_math(current)
1809 #define set_used_math() set_stopped_child_used_math(current)
1810 #define conditional_stopped_child_used_math(condition, child) \
1811 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1812 #define conditional_used_math(condition) \
1813 conditional_stopped_child_used_math(condition, current)
1814 #define copy_to_stopped_child_used_math(child) \
1815 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1816 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1817 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1818 #define used_math() tsk_used_math(current)
1819
1820 #ifdef CONFIG_TREE_PREEMPT_RCU
1821
1822 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1823 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1824
1825 static inline void rcu_copy_process(struct task_struct *p)
1826 {
1827 p->rcu_read_lock_nesting = 0;
1828 p->rcu_read_unlock_special = 0;
1829 p->rcu_blocked_node = NULL;
1830 INIT_LIST_HEAD(&p->rcu_node_entry);
1831 }
1832
1833 #else
1834
1835 static inline void rcu_copy_process(struct task_struct *p)
1836 {
1837 }
1838
1839 #endif
1840
1841 #ifdef CONFIG_SMP
1842 extern int set_cpus_allowed_ptr(struct task_struct *p,
1843 const struct cpumask *new_mask);
1844 #else
1845 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1846 const struct cpumask *new_mask)
1847 {
1848 if (!cpumask_test_cpu(0, new_mask))
1849 return -EINVAL;
1850 return 0;
1851 }
1852 #endif
1853
1854 #ifndef CONFIG_CPUMASK_OFFSTACK
1855 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1856 {
1857 return set_cpus_allowed_ptr(p, &new_mask);
1858 }
1859 #endif
1860
1861 /*
1862 * Architectures can set this to 1 if they have specified
1863 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1864 * but then during bootup it turns out that sched_clock()
1865 * is reliable after all:
1866 */
1867 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1868 extern int sched_clock_stable;
1869 #endif
1870
1871 /* ftrace calls sched_clock() directly */
1872 extern unsigned long long notrace sched_clock(void);
1873
1874 extern void sched_clock_init(void);
1875 extern u64 sched_clock_cpu(int cpu);
1876
1877 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1878 static inline void sched_clock_tick(void)
1879 {
1880 }
1881
1882 static inline void sched_clock_idle_sleep_event(void)
1883 {
1884 }
1885
1886 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1887 {
1888 }
1889 #else
1890 extern void sched_clock_tick(void);
1891 extern void sched_clock_idle_sleep_event(void);
1892 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1893 #endif
1894
1895 /*
1896 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1897 * clock constructed from sched_clock():
1898 */
1899 extern unsigned long long cpu_clock(int cpu);
1900
1901 extern unsigned long long
1902 task_sched_runtime(struct task_struct *task);
1903 extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1904
1905 /* sched_exec is called by processes performing an exec */
1906 #ifdef CONFIG_SMP
1907 extern void sched_exec(void);
1908 #else
1909 #define sched_exec() {}
1910 #endif
1911
1912 extern void sched_clock_idle_sleep_event(void);
1913 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1914
1915 #ifdef CONFIG_HOTPLUG_CPU
1916 extern void idle_task_exit(void);
1917 #else
1918 static inline void idle_task_exit(void) {}
1919 #endif
1920
1921 extern void sched_idle_next(void);
1922
1923 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1924 extern void wake_up_idle_cpu(int cpu);
1925 #else
1926 static inline void wake_up_idle_cpu(int cpu) { }
1927 #endif
1928
1929 extern unsigned int sysctl_sched_latency;
1930 extern unsigned int sysctl_sched_min_granularity;
1931 extern unsigned int sysctl_sched_wakeup_granularity;
1932 extern unsigned int sysctl_sched_shares_ratelimit;
1933 extern unsigned int sysctl_sched_shares_thresh;
1934 extern unsigned int sysctl_sched_child_runs_first;
1935
1936 enum sched_tunable_scaling {
1937 SCHED_TUNABLESCALING_NONE,
1938 SCHED_TUNABLESCALING_LOG,
1939 SCHED_TUNABLESCALING_LINEAR,
1940 SCHED_TUNABLESCALING_END,
1941 };
1942 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
1943
1944 #ifdef CONFIG_SCHED_DEBUG
1945 extern unsigned int sysctl_sched_migration_cost;
1946 extern unsigned int sysctl_sched_nr_migrate;
1947 extern unsigned int sysctl_sched_time_avg;
1948 extern unsigned int sysctl_timer_migration;
1949
1950 int sched_proc_update_handler(struct ctl_table *table, int write,
1951 void __user *buffer, size_t *length,
1952 loff_t *ppos);
1953 #endif
1954 #ifdef CONFIG_SCHED_DEBUG
1955 static inline unsigned int get_sysctl_timer_migration(void)
1956 {
1957 return sysctl_timer_migration;
1958 }
1959 #else
1960 static inline unsigned int get_sysctl_timer_migration(void)
1961 {
1962 return 1;
1963 }
1964 #endif
1965 extern unsigned int sysctl_sched_rt_period;
1966 extern int sysctl_sched_rt_runtime;
1967
1968 int sched_rt_handler(struct ctl_table *table, int write,
1969 void __user *buffer, size_t *lenp,
1970 loff_t *ppos);
1971
1972 extern unsigned int sysctl_sched_compat_yield;
1973
1974 #ifdef CONFIG_RT_MUTEXES
1975 extern int rt_mutex_getprio(struct task_struct *p);
1976 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1977 extern void rt_mutex_adjust_pi(struct task_struct *p);
1978 #else
1979 static inline int rt_mutex_getprio(struct task_struct *p)
1980 {
1981 return p->normal_prio;
1982 }
1983 # define rt_mutex_adjust_pi(p) do { } while (0)
1984 #endif
1985
1986 extern void set_user_nice(struct task_struct *p, long nice);
1987 extern int task_prio(const struct task_struct *p);
1988 extern int task_nice(const struct task_struct *p);
1989 extern int can_nice(const struct task_struct *p, const int nice);
1990 extern int task_curr(const struct task_struct *p);
1991 extern int idle_cpu(int cpu);
1992 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1993 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1994 struct sched_param *);
1995 extern struct task_struct *idle_task(int cpu);
1996 extern struct task_struct *curr_task(int cpu);
1997 extern void set_curr_task(int cpu, struct task_struct *p);
1998
1999 void yield(void);
2000
2001 /*
2002 * The default (Linux) execution domain.
2003 */
2004 extern struct exec_domain default_exec_domain;
2005
2006 union thread_union {
2007 struct thread_info thread_info;
2008 unsigned long stack[THREAD_SIZE/sizeof(long)];
2009 };
2010
2011 #ifndef __HAVE_ARCH_KSTACK_END
2012 static inline int kstack_end(void *addr)
2013 {
2014 /* Reliable end of stack detection:
2015 * Some APM bios versions misalign the stack
2016 */
2017 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
2018 }
2019 #endif
2020
2021 extern union thread_union init_thread_union;
2022 extern struct task_struct init_task;
2023
2024 extern struct mm_struct init_mm;
2025
2026 extern struct pid_namespace init_pid_ns;
2027
2028 /*
2029 * find a task by one of its numerical ids
2030 *
2031 * find_task_by_pid_ns():
2032 * finds a task by its pid in the specified namespace
2033 * find_task_by_vpid():
2034 * finds a task by its virtual pid
2035 *
2036 * see also find_vpid() etc in include/linux/pid.h
2037 */
2038
2039 extern struct task_struct *find_task_by_vpid(pid_t nr);
2040 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2041 struct pid_namespace *ns);
2042
2043 extern void __set_special_pids(struct pid *pid);
2044
2045 /* per-UID process charging. */
2046 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
2047 static inline struct user_struct *get_uid(struct user_struct *u)
2048 {
2049 atomic_inc(&u->__count);
2050 return u;
2051 }
2052 extern void free_uid(struct user_struct *);
2053 extern void release_uids(struct user_namespace *ns);
2054
2055 #include <asm/current.h>
2056
2057 extern void do_timer(unsigned long ticks);
2058
2059 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2060 extern int wake_up_process(struct task_struct *tsk);
2061 extern void wake_up_new_task(struct task_struct *tsk,
2062 unsigned long clone_flags);
2063 #ifdef CONFIG_SMP
2064 extern void kick_process(struct task_struct *tsk);
2065 #else
2066 static inline void kick_process(struct task_struct *tsk) { }
2067 #endif
2068 extern void sched_fork(struct task_struct *p, int clone_flags);
2069 extern void sched_dead(struct task_struct *p);
2070
2071 extern void proc_caches_init(void);
2072 extern void flush_signals(struct task_struct *);
2073 extern void __flush_signals(struct task_struct *);
2074 extern void ignore_signals(struct task_struct *);
2075 extern void flush_signal_handlers(struct task_struct *, int force_default);
2076 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2077
2078 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2079 {
2080 unsigned long flags;
2081 int ret;
2082
2083 spin_lock_irqsave(&tsk->sighand->siglock, flags);
2084 ret = dequeue_signal(tsk, mask, info);
2085 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2086
2087 return ret;
2088 }
2089
2090 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2091 sigset_t *mask);
2092 extern void unblock_all_signals(void);
2093 extern void release_task(struct task_struct * p);
2094 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2095 extern int force_sigsegv(int, struct task_struct *);
2096 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2097 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2098 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2099 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
2100 extern int kill_pgrp(struct pid *pid, int sig, int priv);
2101 extern int kill_pid(struct pid *pid, int sig, int priv);
2102 extern int kill_proc_info(int, struct siginfo *, pid_t);
2103 extern int do_notify_parent(struct task_struct *, int);
2104 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2105 extern void force_sig(int, struct task_struct *);
2106 extern int send_sig(int, struct task_struct *, int);
2107 extern void zap_other_threads(struct task_struct *p);
2108 extern struct sigqueue *sigqueue_alloc(void);
2109 extern void sigqueue_free(struct sigqueue *);
2110 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
2111 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2112 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
2113
2114 static inline int kill_cad_pid(int sig, int priv)
2115 {
2116 return kill_pid(cad_pid, sig, priv);
2117 }
2118
2119 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2120 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2121 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2122 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2123
2124 /*
2125 * True if we are on the alternate signal stack.
2126 */
2127 static inline int on_sig_stack(unsigned long sp)
2128 {
2129 #ifdef CONFIG_STACK_GROWSUP
2130 return sp >= current->sas_ss_sp &&
2131 sp - current->sas_ss_sp < current->sas_ss_size;
2132 #else
2133 return sp > current->sas_ss_sp &&
2134 sp - current->sas_ss_sp <= current->sas_ss_size;
2135 #endif
2136 }
2137
2138 static inline int sas_ss_flags(unsigned long sp)
2139 {
2140 return (current->sas_ss_size == 0 ? SS_DISABLE
2141 : on_sig_stack(sp) ? SS_ONSTACK : 0);
2142 }
2143
2144 /*
2145 * Routines for handling mm_structs
2146 */
2147 extern struct mm_struct * mm_alloc(void);
2148
2149 /* mmdrop drops the mm and the page tables */
2150 extern void __mmdrop(struct mm_struct *);
2151 static inline void mmdrop(struct mm_struct * mm)
2152 {
2153 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2154 __mmdrop(mm);
2155 }
2156
2157 /* mmput gets rid of the mappings and all user-space */
2158 extern void mmput(struct mm_struct *);
2159 /* Grab a reference to a task's mm, if it is not already going away */
2160 extern struct mm_struct *get_task_mm(struct task_struct *task);
2161 /* Remove the current tasks stale references to the old mm_struct */
2162 extern void mm_release(struct task_struct *, struct mm_struct *);
2163 /* Allocate a new mm structure and copy contents from tsk->mm */
2164 extern struct mm_struct *dup_mm(struct task_struct *tsk);
2165
2166 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2167 struct task_struct *, struct pt_regs *);
2168 extern void flush_thread(void);
2169 extern void exit_thread(void);
2170
2171 extern void exit_files(struct task_struct *);
2172 extern void __cleanup_signal(struct signal_struct *);
2173 extern void __cleanup_sighand(struct sighand_struct *);
2174
2175 extern void exit_itimers(struct signal_struct *);
2176 extern void flush_itimer_signals(void);
2177
2178 extern NORET_TYPE void do_group_exit(int);
2179
2180 extern void daemonize(const char *, ...);
2181 extern int allow_signal(int);
2182 extern int disallow_signal(int);
2183
2184 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
2185 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
2186 struct task_struct *fork_idle(int);
2187
2188 extern void set_task_comm(struct task_struct *tsk, char *from);
2189 extern char *get_task_comm(char *to, struct task_struct *tsk);
2190
2191 #ifdef CONFIG_SMP
2192 extern void wait_task_context_switch(struct task_struct *p);
2193 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2194 #else
2195 static inline void wait_task_context_switch(struct task_struct *p) {}
2196 static inline unsigned long wait_task_inactive(struct task_struct *p,
2197 long match_state)
2198 {
2199 return 1;
2200 }
2201 #endif
2202
2203 #define next_task(p) \
2204 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2205
2206 #define for_each_process(p) \
2207 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2208
2209 extern bool current_is_single_threaded(void);
2210
2211 /*
2212 * Careful: do_each_thread/while_each_thread is a double loop so
2213 * 'break' will not work as expected - use goto instead.
2214 */
2215 #define do_each_thread(g, t) \
2216 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2217
2218 #define while_each_thread(g, t) \
2219 while ((t = next_thread(t)) != g)
2220
2221 /* de_thread depends on thread_group_leader not being a pid based check */
2222 #define thread_group_leader(p) (p == p->group_leader)
2223
2224 /* Do to the insanities of de_thread it is possible for a process
2225 * to have the pid of the thread group leader without actually being
2226 * the thread group leader. For iteration through the pids in proc
2227 * all we care about is that we have a task with the appropriate
2228 * pid, we don't actually care if we have the right task.
2229 */
2230 static inline int has_group_leader_pid(struct task_struct *p)
2231 {
2232 return p->pid == p->tgid;
2233 }
2234
2235 static inline
2236 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2237 {
2238 return p1->tgid == p2->tgid;
2239 }
2240
2241 static inline struct task_struct *next_thread(const struct task_struct *p)
2242 {
2243 return list_entry_rcu(p->thread_group.next,
2244 struct task_struct, thread_group);
2245 }
2246
2247 static inline int thread_group_empty(struct task_struct *p)
2248 {
2249 return list_empty(&p->thread_group);
2250 }
2251
2252 #define delay_group_leader(p) \
2253 (thread_group_leader(p) && !thread_group_empty(p))
2254
2255 static inline int task_detached(struct task_struct *p)
2256 {
2257 return p->exit_signal == -1;
2258 }
2259
2260 /*
2261 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2262 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2263 * pins the final release of task.io_context. Also protects ->cpuset and
2264 * ->cgroup.subsys[].
2265 *
2266 * Nests both inside and outside of read_lock(&tasklist_lock).
2267 * It must not be nested with write_lock_irq(&tasklist_lock),
2268 * neither inside nor outside.
2269 */
2270 static inline void task_lock(struct task_struct *p)
2271 {
2272 spin_lock(&p->alloc_lock);
2273 }
2274
2275 static inline void task_unlock(struct task_struct *p)
2276 {
2277 spin_unlock(&p->alloc_lock);
2278 }
2279
2280 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2281 unsigned long *flags);
2282
2283 static inline void unlock_task_sighand(struct task_struct *tsk,
2284 unsigned long *flags)
2285 {
2286 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2287 }
2288
2289 #ifndef __HAVE_THREAD_FUNCTIONS
2290
2291 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2292 #define task_stack_page(task) ((task)->stack)
2293
2294 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2295 {
2296 *task_thread_info(p) = *task_thread_info(org);
2297 task_thread_info(p)->task = p;
2298 }
2299
2300 static inline unsigned long *end_of_stack(struct task_struct *p)
2301 {
2302 return (unsigned long *)(task_thread_info(p) + 1);
2303 }
2304
2305 #endif
2306
2307 static inline int object_is_on_stack(void *obj)
2308 {
2309 void *stack = task_stack_page(current);
2310
2311 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2312 }
2313
2314 extern void thread_info_cache_init(void);
2315
2316 #ifdef CONFIG_DEBUG_STACK_USAGE
2317 static inline unsigned long stack_not_used(struct task_struct *p)
2318 {
2319 unsigned long *n = end_of_stack(p);
2320
2321 do { /* Skip over canary */
2322 n++;
2323 } while (!*n);
2324
2325 return (unsigned long)n - (unsigned long)end_of_stack(p);
2326 }
2327 #endif
2328
2329 /* set thread flags in other task's structures
2330 * - see asm/thread_info.h for TIF_xxxx flags available
2331 */
2332 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2333 {
2334 set_ti_thread_flag(task_thread_info(tsk), flag);
2335 }
2336
2337 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2338 {
2339 clear_ti_thread_flag(task_thread_info(tsk), flag);
2340 }
2341
2342 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2343 {
2344 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2345 }
2346
2347 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2348 {
2349 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2350 }
2351
2352 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2353 {
2354 return test_ti_thread_flag(task_thread_info(tsk), flag);
2355 }
2356
2357 static inline void set_tsk_need_resched(struct task_struct *tsk)
2358 {
2359 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2360 }
2361
2362 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2363 {
2364 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2365 }
2366
2367 static inline int test_tsk_need_resched(struct task_struct *tsk)
2368 {
2369 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2370 }
2371
2372 static inline int restart_syscall(void)
2373 {
2374 set_tsk_thread_flag(current, TIF_SIGPENDING);
2375 return -ERESTARTNOINTR;
2376 }
2377
2378 static inline int signal_pending(struct task_struct *p)
2379 {
2380 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2381 }
2382
2383 static inline int __fatal_signal_pending(struct task_struct *p)
2384 {
2385 return unlikely(sigismember(&p->pending.signal, SIGKILL));
2386 }
2387
2388 static inline int fatal_signal_pending(struct task_struct *p)
2389 {
2390 return signal_pending(p) && __fatal_signal_pending(p);
2391 }
2392
2393 static inline int signal_pending_state(long state, struct task_struct *p)
2394 {
2395 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2396 return 0;
2397 if (!signal_pending(p))
2398 return 0;
2399
2400 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2401 }
2402
2403 static inline int need_resched(void)
2404 {
2405 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2406 }
2407
2408 /*
2409 * cond_resched() and cond_resched_lock(): latency reduction via
2410 * explicit rescheduling in places that are safe. The return
2411 * value indicates whether a reschedule was done in fact.
2412 * cond_resched_lock() will drop the spinlock before scheduling,
2413 * cond_resched_softirq() will enable bhs before scheduling.
2414 */
2415 extern int _cond_resched(void);
2416
2417 #define cond_resched() ({ \
2418 __might_sleep(__FILE__, __LINE__, 0); \
2419 _cond_resched(); \
2420 })
2421
2422 extern int __cond_resched_lock(spinlock_t *lock);
2423
2424 #ifdef CONFIG_PREEMPT
2425 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2426 #else
2427 #define PREEMPT_LOCK_OFFSET 0
2428 #endif
2429
2430 #define cond_resched_lock(lock) ({ \
2431 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2432 __cond_resched_lock(lock); \
2433 })
2434
2435 extern int __cond_resched_softirq(void);
2436
2437 #define cond_resched_softirq() ({ \
2438 __might_sleep(__FILE__, __LINE__, SOFTIRQ_OFFSET); \
2439 __cond_resched_softirq(); \
2440 })
2441
2442 /*
2443 * Does a critical section need to be broken due to another
2444 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2445 * but a general need for low latency)
2446 */
2447 static inline int spin_needbreak(spinlock_t *lock)
2448 {
2449 #ifdef CONFIG_PREEMPT
2450 return spin_is_contended(lock);
2451 #else
2452 return 0;
2453 #endif
2454 }
2455
2456 /*
2457 * Thread group CPU time accounting.
2458 */
2459 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2460 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2461
2462 static inline void thread_group_cputime_init(struct signal_struct *sig)
2463 {
2464 sig->cputimer.cputime = INIT_CPUTIME;
2465 spin_lock_init(&sig->cputimer.lock);
2466 sig->cputimer.running = 0;
2467 }
2468
2469 static inline void thread_group_cputime_free(struct signal_struct *sig)
2470 {
2471 }
2472
2473 /*
2474 * Reevaluate whether the task has signals pending delivery.
2475 * Wake the task if so.
2476 * This is required every time the blocked sigset_t changes.
2477 * callers must hold sighand->siglock.
2478 */
2479 extern void recalc_sigpending_and_wake(struct task_struct *t);
2480 extern void recalc_sigpending(void);
2481
2482 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2483
2484 /*
2485 * Wrappers for p->thread_info->cpu access. No-op on UP.
2486 */
2487 #ifdef CONFIG_SMP
2488
2489 static inline unsigned int task_cpu(const struct task_struct *p)
2490 {
2491 return task_thread_info(p)->cpu;
2492 }
2493
2494 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2495
2496 #else
2497
2498 static inline unsigned int task_cpu(const struct task_struct *p)
2499 {
2500 return 0;
2501 }
2502
2503 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2504 {
2505 }
2506
2507 #endif /* CONFIG_SMP */
2508
2509 #ifdef CONFIG_TRACING
2510 extern void
2511 __trace_special(void *__tr, void *__data,
2512 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2513 #else
2514 static inline void
2515 __trace_special(void *__tr, void *__data,
2516 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2517 {
2518 }
2519 #endif
2520
2521 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2522 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2523
2524 extern void normalize_rt_tasks(void);
2525
2526 #ifdef CONFIG_GROUP_SCHED
2527
2528 extern struct task_group init_task_group;
2529 #ifdef CONFIG_USER_SCHED
2530 extern struct task_group root_task_group;
2531 extern void set_tg_uid(struct user_struct *user);
2532 #endif
2533
2534 extern struct task_group *sched_create_group(struct task_group *parent);
2535 extern void sched_destroy_group(struct task_group *tg);
2536 extern void sched_move_task(struct task_struct *tsk);
2537 #ifdef CONFIG_FAIR_GROUP_SCHED
2538 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2539 extern unsigned long sched_group_shares(struct task_group *tg);
2540 #endif
2541 #ifdef CONFIG_RT_GROUP_SCHED
2542 extern int sched_group_set_rt_runtime(struct task_group *tg,
2543 long rt_runtime_us);
2544 extern long sched_group_rt_runtime(struct task_group *tg);
2545 extern int sched_group_set_rt_period(struct task_group *tg,
2546 long rt_period_us);
2547 extern long sched_group_rt_period(struct task_group *tg);
2548 extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2549 #endif
2550 #endif
2551
2552 extern int task_can_switch_user(struct user_struct *up,
2553 struct task_struct *tsk);
2554
2555 #ifdef CONFIG_TASK_XACCT
2556 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2557 {
2558 tsk->ioac.rchar += amt;
2559 }
2560
2561 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2562 {
2563 tsk->ioac.wchar += amt;
2564 }
2565
2566 static inline void inc_syscr(struct task_struct *tsk)
2567 {
2568 tsk->ioac.syscr++;
2569 }
2570
2571 static inline void inc_syscw(struct task_struct *tsk)
2572 {
2573 tsk->ioac.syscw++;
2574 }
2575 #else
2576 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2577 {
2578 }
2579
2580 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2581 {
2582 }
2583
2584 static inline void inc_syscr(struct task_struct *tsk)
2585 {
2586 }
2587
2588 static inline void inc_syscw(struct task_struct *tsk)
2589 {
2590 }
2591 #endif
2592
2593 #ifndef TASK_SIZE_OF
2594 #define TASK_SIZE_OF(tsk) TASK_SIZE
2595 #endif
2596
2597 /*
2598 * Call the function if the target task is executing on a CPU right now:
2599 */
2600 extern void task_oncpu_function_call(struct task_struct *p,
2601 void (*func) (void *info), void *info);
2602
2603
2604 #ifdef CONFIG_MM_OWNER
2605 extern void mm_update_next_owner(struct mm_struct *mm);
2606 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2607 #else
2608 static inline void mm_update_next_owner(struct mm_struct *mm)
2609 {
2610 }
2611
2612 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2613 {
2614 }
2615 #endif /* CONFIG_MM_OWNER */
2616
2617 static inline unsigned long task_rlimit(const struct task_struct *tsk,
2618 unsigned int limit)
2619 {
2620 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2621 }
2622
2623 static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2624 unsigned int limit)
2625 {
2626 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2627 }
2628
2629 static inline unsigned long rlimit(unsigned int limit)
2630 {
2631 return task_rlimit(current, limit);
2632 }
2633
2634 static inline unsigned long rlimit_max(unsigned int limit)
2635 {
2636 return task_rlimit_max(current, limit);
2637 }
2638
2639 #endif /* __KERNEL__ */
2640
2641 #endif
2642
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.