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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
[deliverable/linux.git] / include / linux / sched.h
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 sched_param {
47 int sched_priority;
48 };
49
50 #include <asm/param.h> /* for HZ */
51
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>
64
65 #include <asm/system.h>
66 #include <asm/page.h>
67 #include <asm/ptrace.h>
68 #include <asm/cputime.h>
69
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>
84
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>
94
95 #include <asm/processor.h>
96
97 struct exec_domain;
98 struct futex_pi_state;
99 struct robust_list_head;
100 struct bio_list;
101 struct fs_struct;
102 struct perf_event_context;
103
104 /*
105 * List of flags we want to share for kernel threads,
106 * if only because they are not used by them anyway.
107 */
108 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
109
110 /*
111 * These are the constant used to fake the fixed-point load-average
112 * counting. Some notes:
113 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
114 * a load-average precision of 10 bits integer + 11 bits fractional
115 * - if you want to count load-averages more often, you need more
116 * precision, or rounding will get you. With 2-second counting freq,
117 * the EXP_n values would be 1981, 2034 and 2043 if still using only
118 * 11 bit fractions.
119 */
120 extern unsigned long avenrun[]; /* Load averages */
121 extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
122
123 #define FSHIFT 11 /* nr of bits of precision */
124 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
125 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
126 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
127 #define EXP_5 2014 /* 1/exp(5sec/5min) */
128 #define EXP_15 2037 /* 1/exp(5sec/15min) */
129
130 #define CALC_LOAD(load,exp,n) \
131 load *= exp; \
132 load += n*(FIXED_1-exp); \
133 load >>= FSHIFT;
134
135 extern unsigned long total_forks;
136 extern int nr_threads;
137 DECLARE_PER_CPU(unsigned long, process_counts);
138 extern int nr_processes(void);
139 extern unsigned long nr_running(void);
140 extern unsigned long nr_uninterruptible(void);
141 extern unsigned long nr_iowait(void);
142 extern unsigned long nr_iowait_cpu(int cpu);
143 extern unsigned long this_cpu_load(void);
144
145
146 extern void calc_global_load(void);
147
148 extern unsigned long get_parent_ip(unsigned long addr);
149
150 struct seq_file;
151 struct cfs_rq;
152 struct task_group;
153 #ifdef CONFIG_SCHED_DEBUG
154 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
155 extern void proc_sched_set_task(struct task_struct *p);
156 extern void
157 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
158 #else
159 static inline void
160 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
161 {
162 }
163 static inline void proc_sched_set_task(struct task_struct *p)
164 {
165 }
166 static inline void
167 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
168 {
169 }
170 #endif
171
172 /*
173 * Task state bitmask. NOTE! These bits are also
174 * encoded in fs/proc/array.c: get_task_state().
175 *
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
180 * mistake.
181 */
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
189 #define EXIT_DEAD 32
190 /* in tsk->state again */
191 #define TASK_DEAD 64
192 #define TASK_WAKEKILL 128
193 #define TASK_WAKING 256
194 #define TASK_STATE_MAX 512
195
196 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
197
198 extern char ___assert_task_state[1 - 2*!!(
199 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
200
201 /* Convenience macros for the sake of set_task_state */
202 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
203 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
204 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
205
206 /* Convenience macros for the sake of wake_up */
207 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
208 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
209
210 /* get_task_state() */
211 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
212 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
213 __TASK_TRACED)
214
215 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
216 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
217 #define task_is_dead(task) ((task)->exit_state != 0)
218 #define task_is_stopped_or_traced(task) \
219 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
220 #define task_contributes_to_load(task) \
221 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
222 (task->flags & PF_FREEZING) == 0)
223
224 #define __set_task_state(tsk, state_value) \
225 do { (tsk)->state = (state_value); } while (0)
226 #define set_task_state(tsk, state_value) \
227 set_mb((tsk)->state, (state_value))
228
229 /*
230 * set_current_state() includes a barrier so that the write of current->state
231 * is correctly serialised wrt the caller's subsequent test of whether to
232 * actually sleep:
233 *
234 * set_current_state(TASK_UNINTERRUPTIBLE);
235 * if (do_i_need_to_sleep())
236 * schedule();
237 *
238 * If the caller does not need such serialisation then use __set_current_state()
239 */
240 #define __set_current_state(state_value) \
241 do { current->state = (state_value); } while (0)
242 #define set_current_state(state_value) \
243 set_mb(current->state, (state_value))
244
245 /* Task command name length */
246 #define TASK_COMM_LEN 16
247
248 #include <linux/spinlock.h>
249
250 /*
251 * This serializes "schedule()" and also protects
252 * the run-queue from deletions/modifications (but
253 * _adding_ to the beginning of the run-queue has
254 * a separate lock).
255 */
256 extern rwlock_t tasklist_lock;
257 extern spinlock_t mmlist_lock;
258
259 struct task_struct;
260
261 #ifdef CONFIG_PROVE_RCU
262 extern int lockdep_tasklist_lock_is_held(void);
263 #endif /* #ifdef CONFIG_PROVE_RCU */
264
265 extern void sched_init(void);
266 extern void sched_init_smp(void);
267 extern asmlinkage void schedule_tail(struct task_struct *prev);
268 extern void init_idle(struct task_struct *idle, int cpu);
269 extern void init_idle_bootup_task(struct task_struct *idle);
270
271 extern int runqueue_is_locked(int cpu);
272
273 extern cpumask_var_t nohz_cpu_mask;
274 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
275 extern void select_nohz_load_balancer(int stop_tick);
276 extern int get_nohz_timer_target(void);
277 #else
278 static inline void select_nohz_load_balancer(int stop_tick) { }
279 #endif
280
281 /*
282 * Only dump TASK_* tasks. (0 for all tasks)
283 */
284 extern void show_state_filter(unsigned long state_filter);
285
286 static inline void show_state(void)
287 {
288 show_state_filter(0);
289 }
290
291 extern void show_regs(struct pt_regs *);
292
293 /*
294 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
295 * task), SP is the stack pointer of the first frame that should be shown in the back
296 * trace (or NULL if the entire call-chain of the task should be shown).
297 */
298 extern void show_stack(struct task_struct *task, unsigned long *sp);
299
300 void io_schedule(void);
301 long io_schedule_timeout(long timeout);
302
303 extern void cpu_init (void);
304 extern void trap_init(void);
305 extern void update_process_times(int user);
306 extern void scheduler_tick(void);
307
308 extern void sched_show_task(struct task_struct *p);
309
310 #ifdef CONFIG_LOCKUP_DETECTOR
311 extern void touch_softlockup_watchdog(void);
312 extern void touch_softlockup_watchdog_sync(void);
313 extern void touch_all_softlockup_watchdogs(void);
314 extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
315 void __user *buffer,
316 size_t *lenp, loff_t *ppos);
317 extern unsigned int softlockup_panic;
318 extern int softlockup_thresh;
319 #else
320 static inline void touch_softlockup_watchdog(void)
321 {
322 }
323 static inline void touch_softlockup_watchdog_sync(void)
324 {
325 }
326 static inline void touch_all_softlockup_watchdogs(void)
327 {
328 }
329 #endif
330
331 #ifdef CONFIG_DETECT_HUNG_TASK
332 extern unsigned int sysctl_hung_task_panic;
333 extern unsigned long sysctl_hung_task_check_count;
334 extern unsigned long sysctl_hung_task_timeout_secs;
335 extern unsigned long sysctl_hung_task_warnings;
336 extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
337 void __user *buffer,
338 size_t *lenp, loff_t *ppos);
339 #else
340 /* Avoid need for ifdefs elsewhere in the code */
341 enum { sysctl_hung_task_timeout_secs = 0 };
342 #endif
343
344 /* Attach to any functions which should be ignored in wchan output. */
345 #define __sched __attribute__((__section__(".sched.text")))
346
347 /* Linker adds these: start and end of __sched functions */
348 extern char __sched_text_start[], __sched_text_end[];
349
350 /* Is this address in the __sched functions? */
351 extern int in_sched_functions(unsigned long addr);
352
353 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
354 extern signed long schedule_timeout(signed long timeout);
355 extern signed long schedule_timeout_interruptible(signed long timeout);
356 extern signed long schedule_timeout_killable(signed long timeout);
357 extern signed long schedule_timeout_uninterruptible(signed long timeout);
358 asmlinkage void schedule(void);
359 extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner);
360
361 struct nsproxy;
362 struct user_namespace;
363
364 /*
365 * Default maximum number of active map areas, this limits the number of vmas
366 * per mm struct. Users can overwrite this number by sysctl but there is a
367 * problem.
368 *
369 * When a program's coredump is generated as ELF format, a section is created
370 * per a vma. In ELF, the number of sections is represented in unsigned short.
371 * This means the number of sections should be smaller than 65535 at coredump.
372 * Because the kernel adds some informative sections to a image of program at
373 * generating coredump, we need some margin. The number of extra sections is
374 * 1-3 now and depends on arch. We use "5" as safe margin, here.
375 */
376 #define MAPCOUNT_ELF_CORE_MARGIN (5)
377 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
378
379 extern int sysctl_max_map_count;
380
381 #include <linux/aio.h>
382
383 #ifdef CONFIG_MMU
384 extern void arch_pick_mmap_layout(struct mm_struct *mm);
385 extern unsigned long
386 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
387 unsigned long, unsigned long);
388 extern unsigned long
389 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
390 unsigned long len, unsigned long pgoff,
391 unsigned long flags);
392 extern void arch_unmap_area(struct mm_struct *, unsigned long);
393 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
394 #else
395 static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
396 #endif
397
398
399 extern void set_dumpable(struct mm_struct *mm, int value);
400 extern int get_dumpable(struct mm_struct *mm);
401
402 /* mm flags */
403 /* dumpable bits */
404 #define MMF_DUMPABLE 0 /* core dump is permitted */
405 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
406
407 #define MMF_DUMPABLE_BITS 2
408 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
409
410 /* coredump filter bits */
411 #define MMF_DUMP_ANON_PRIVATE 2
412 #define MMF_DUMP_ANON_SHARED 3
413 #define MMF_DUMP_MAPPED_PRIVATE 4
414 #define MMF_DUMP_MAPPED_SHARED 5
415 #define MMF_DUMP_ELF_HEADERS 6
416 #define MMF_DUMP_HUGETLB_PRIVATE 7
417 #define MMF_DUMP_HUGETLB_SHARED 8
418
419 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
420 #define MMF_DUMP_FILTER_BITS 7
421 #define MMF_DUMP_FILTER_MASK \
422 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
423 #define MMF_DUMP_FILTER_DEFAULT \
424 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
425 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
426
427 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
428 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
429 #else
430 # define MMF_DUMP_MASK_DEFAULT_ELF 0
431 #endif
432 /* leave room for more dump flags */
433 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
434
435 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
436
437 struct sighand_struct {
438 atomic_t count;
439 struct k_sigaction action[_NSIG];
440 spinlock_t siglock;
441 wait_queue_head_t signalfd_wqh;
442 };
443
444 struct pacct_struct {
445 int ac_flag;
446 long ac_exitcode;
447 unsigned long ac_mem;
448 cputime_t ac_utime, ac_stime;
449 unsigned long ac_minflt, ac_majflt;
450 };
451
452 struct cpu_itimer {
453 cputime_t expires;
454 cputime_t incr;
455 u32 error;
456 u32 incr_error;
457 };
458
459 /**
460 * struct task_cputime - collected CPU time counts
461 * @utime: time spent in user mode, in &cputime_t units
462 * @stime: time spent in kernel mode, in &cputime_t units
463 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
464 *
465 * This structure groups together three kinds of CPU time that are
466 * tracked for threads and thread groups. Most things considering
467 * CPU time want to group these counts together and treat all three
468 * of them in parallel.
469 */
470 struct task_cputime {
471 cputime_t utime;
472 cputime_t stime;
473 unsigned long long sum_exec_runtime;
474 };
475 /* Alternate field names when used to cache expirations. */
476 #define prof_exp stime
477 #define virt_exp utime
478 #define sched_exp sum_exec_runtime
479
480 #define INIT_CPUTIME \
481 (struct task_cputime) { \
482 .utime = cputime_zero, \
483 .stime = cputime_zero, \
484 .sum_exec_runtime = 0, \
485 }
486
487 /*
488 * Disable preemption until the scheduler is running.
489 * Reset by start_kernel()->sched_init()->init_idle().
490 *
491 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
492 * before the scheduler is active -- see should_resched().
493 */
494 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
495
496 /**
497 * struct thread_group_cputimer - thread group interval timer counts
498 * @cputime: thread group interval timers.
499 * @running: non-zero when there are timers running and
500 * @cputime receives updates.
501 * @lock: lock for fields in this struct.
502 *
503 * This structure contains the version of task_cputime, above, that is
504 * used for thread group CPU timer calculations.
505 */
506 struct thread_group_cputimer {
507 struct task_cputime cputime;
508 int running;
509 spinlock_t lock;
510 };
511
512 /*
513 * NOTE! "signal_struct" does not have it's own
514 * locking, because a shared signal_struct always
515 * implies a shared sighand_struct, so locking
516 * sighand_struct is always a proper superset of
517 * the locking of signal_struct.
518 */
519 struct signal_struct {
520 atomic_t sigcnt;
521 atomic_t live;
522 int nr_threads;
523
524 wait_queue_head_t wait_chldexit; /* for wait4() */
525
526 /* current thread group signal load-balancing target: */
527 struct task_struct *curr_target;
528
529 /* shared signal handling: */
530 struct sigpending shared_pending;
531
532 /* thread group exit support */
533 int group_exit_code;
534 /* overloaded:
535 * - notify group_exit_task when ->count is equal to notify_count
536 * - everyone except group_exit_task is stopped during signal delivery
537 * of fatal signals, group_exit_task processes the signal.
538 */
539 int notify_count;
540 struct task_struct *group_exit_task;
541
542 /* thread group stop support, overloads group_exit_code too */
543 int group_stop_count;
544 unsigned int flags; /* see SIGNAL_* flags below */
545
546 /* POSIX.1b Interval Timers */
547 struct list_head posix_timers;
548
549 /* ITIMER_REAL timer for the process */
550 struct hrtimer real_timer;
551 struct pid *leader_pid;
552 ktime_t it_real_incr;
553
554 /*
555 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
556 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
557 * values are defined to 0 and 1 respectively
558 */
559 struct cpu_itimer it[2];
560
561 /*
562 * Thread group totals for process CPU timers.
563 * See thread_group_cputimer(), et al, for details.
564 */
565 struct thread_group_cputimer cputimer;
566
567 /* Earliest-expiration cache. */
568 struct task_cputime cputime_expires;
569
570 struct list_head cpu_timers[3];
571
572 struct pid *tty_old_pgrp;
573
574 /* boolean value for session group leader */
575 int leader;
576
577 struct tty_struct *tty; /* NULL if no tty */
578
579 /*
580 * Cumulative resource counters for dead threads in the group,
581 * and for reaped dead child processes forked by this group.
582 * Live threads maintain their own counters and add to these
583 * in __exit_signal, except for the group leader.
584 */
585 cputime_t utime, stime, cutime, cstime;
586 cputime_t gtime;
587 cputime_t cgtime;
588 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
589 cputime_t prev_utime, prev_stime;
590 #endif
591 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
592 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
593 unsigned long inblock, oublock, cinblock, coublock;
594 unsigned long maxrss, cmaxrss;
595 struct task_io_accounting ioac;
596
597 /*
598 * Cumulative ns of schedule CPU time fo dead threads in the
599 * group, not including a zombie group leader, (This only differs
600 * from jiffies_to_ns(utime + stime) if sched_clock uses something
601 * other than jiffies.)
602 */
603 unsigned long long sum_sched_runtime;
604
605 /*
606 * We don't bother to synchronize most readers of this at all,
607 * because there is no reader checking a limit that actually needs
608 * to get both rlim_cur and rlim_max atomically, and either one
609 * alone is a single word that can safely be read normally.
610 * getrlimit/setrlimit use task_lock(current->group_leader) to
611 * protect this instead of the siglock, because they really
612 * have no need to disable irqs.
613 */
614 struct rlimit rlim[RLIM_NLIMITS];
615
616 #ifdef CONFIG_BSD_PROCESS_ACCT
617 struct pacct_struct pacct; /* per-process accounting information */
618 #endif
619 #ifdef CONFIG_TASKSTATS
620 struct taskstats *stats;
621 #endif
622 #ifdef CONFIG_AUDIT
623 unsigned audit_tty;
624 struct tty_audit_buf *tty_audit_buf;
625 #endif
626
627 int oom_adj; /* OOM kill score adjustment (bit shift) */
628 int oom_score_adj; /* OOM kill score adjustment */
629 };
630
631 /* Context switch must be unlocked if interrupts are to be enabled */
632 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
633 # define __ARCH_WANT_UNLOCKED_CTXSW
634 #endif
635
636 /*
637 * Bits in flags field of signal_struct.
638 */
639 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
640 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
641 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
642 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
643 /*
644 * Pending notifications to parent.
645 */
646 #define SIGNAL_CLD_STOPPED 0x00000010
647 #define SIGNAL_CLD_CONTINUED 0x00000020
648 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
649
650 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
651
652 /* If true, all threads except ->group_exit_task have pending SIGKILL */
653 static inline int signal_group_exit(const struct signal_struct *sig)
654 {
655 return (sig->flags & SIGNAL_GROUP_EXIT) ||
656 (sig->group_exit_task != NULL);
657 }
658
659 /*
660 * Some day this will be a full-fledged user tracking system..
661 */
662 struct user_struct {
663 atomic_t __count; /* reference count */
664 atomic_t processes; /* How many processes does this user have? */
665 atomic_t files; /* How many open files does this user have? */
666 atomic_t sigpending; /* How many pending signals does this user have? */
667 #ifdef CONFIG_INOTIFY_USER
668 atomic_t inotify_watches; /* How many inotify watches does this user have? */
669 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
670 #endif
671 #ifdef CONFIG_EPOLL
672 atomic_t epoll_watches; /* The number of file descriptors currently watched */
673 #endif
674 #ifdef CONFIG_POSIX_MQUEUE
675 /* protected by mq_lock */
676 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
677 #endif
678 unsigned long locked_shm; /* How many pages of mlocked shm ? */
679
680 #ifdef CONFIG_KEYS
681 struct key *uid_keyring; /* UID specific keyring */
682 struct key *session_keyring; /* UID's default session keyring */
683 #endif
684
685 /* Hash table maintenance information */
686 struct hlist_node uidhash_node;
687 uid_t uid;
688 struct user_namespace *user_ns;
689
690 #ifdef CONFIG_PERF_EVENTS
691 atomic_long_t locked_vm;
692 #endif
693 };
694
695 extern int uids_sysfs_init(void);
696
697 extern struct user_struct *find_user(uid_t);
698
699 extern struct user_struct root_user;
700 #define INIT_USER (&root_user)
701
702
703 struct backing_dev_info;
704 struct reclaim_state;
705
706 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
707 struct sched_info {
708 /* cumulative counters */
709 unsigned long pcount; /* # of times run on this cpu */
710 unsigned long long run_delay; /* time spent waiting on a runqueue */
711
712 /* timestamps */
713 unsigned long long last_arrival,/* when we last ran on a cpu */
714 last_queued; /* when we were last queued to run */
715 #ifdef CONFIG_SCHEDSTATS
716 /* BKL stats */
717 unsigned int bkl_count;
718 #endif
719 };
720 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
721
722 #ifdef CONFIG_TASK_DELAY_ACCT
723 struct task_delay_info {
724 spinlock_t lock;
725 unsigned int flags; /* Private per-task flags */
726
727 /* For each stat XXX, add following, aligned appropriately
728 *
729 * struct timespec XXX_start, XXX_end;
730 * u64 XXX_delay;
731 * u32 XXX_count;
732 *
733 * Atomicity of updates to XXX_delay, XXX_count protected by
734 * single lock above (split into XXX_lock if contention is an issue).
735 */
736
737 /*
738 * XXX_count is incremented on every XXX operation, the delay
739 * associated with the operation is added to XXX_delay.
740 * XXX_delay contains the accumulated delay time in nanoseconds.
741 */
742 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
743 u64 blkio_delay; /* wait for sync block io completion */
744 u64 swapin_delay; /* wait for swapin block io completion */
745 u32 blkio_count; /* total count of the number of sync block */
746 /* io operations performed */
747 u32 swapin_count; /* total count of the number of swapin block */
748 /* io operations performed */
749
750 struct timespec freepages_start, freepages_end;
751 u64 freepages_delay; /* wait for memory reclaim */
752 u32 freepages_count; /* total count of memory reclaim */
753 };
754 #endif /* CONFIG_TASK_DELAY_ACCT */
755
756 static inline int sched_info_on(void)
757 {
758 #ifdef CONFIG_SCHEDSTATS
759 return 1;
760 #elif defined(CONFIG_TASK_DELAY_ACCT)
761 extern int delayacct_on;
762 return delayacct_on;
763 #else
764 return 0;
765 #endif
766 }
767
768 enum cpu_idle_type {
769 CPU_IDLE,
770 CPU_NOT_IDLE,
771 CPU_NEWLY_IDLE,
772 CPU_MAX_IDLE_TYPES
773 };
774
775 /*
776 * sched-domains (multiprocessor balancing) declarations:
777 */
778
779 /*
780 * Increase resolution of nice-level calculations:
781 */
782 #define SCHED_LOAD_SHIFT 10
783 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
784
785 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
786
787 #ifdef CONFIG_SMP
788 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
789 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
790 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
791 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
792 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
793 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
794 #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */
795 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
796 #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */
797 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
798 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
799 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
800 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
801
802 enum powersavings_balance_level {
803 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */
804 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package
805 * first for long running threads
806 */
807 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle
808 * cpu package for power savings
809 */
810 MAX_POWERSAVINGS_BALANCE_LEVELS
811 };
812
813 extern int sched_mc_power_savings, sched_smt_power_savings;
814
815 static inline int sd_balance_for_mc_power(void)
816 {
817 if (sched_smt_power_savings)
818 return SD_POWERSAVINGS_BALANCE;
819
820 if (!sched_mc_power_savings)
821 return SD_PREFER_SIBLING;
822
823 return 0;
824 }
825
826 static inline int sd_balance_for_package_power(void)
827 {
828 if (sched_mc_power_savings | sched_smt_power_savings)
829 return SD_POWERSAVINGS_BALANCE;
830
831 return SD_PREFER_SIBLING;
832 }
833
834 extern int __weak arch_sd_sibiling_asym_packing(void);
835
836 /*
837 * Optimise SD flags for power savings:
838 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
839 * Keep default SD flags if sched_{smt,mc}_power_saving=0
840 */
841
842 static inline int sd_power_saving_flags(void)
843 {
844 if (sched_mc_power_savings | sched_smt_power_savings)
845 return SD_BALANCE_NEWIDLE;
846
847 return 0;
848 }
849
850 struct sched_group {
851 struct sched_group *next; /* Must be a circular list */
852
853 /*
854 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
855 * single CPU.
856 */
857 unsigned int cpu_power, cpu_power_orig;
858
859 /*
860 * The CPUs this group covers.
861 *
862 * NOTE: this field is variable length. (Allocated dynamically
863 * by attaching extra space to the end of the structure,
864 * depending on how many CPUs the kernel has booted up with)
865 *
866 * It is also be embedded into static data structures at build
867 * time. (See 'struct static_sched_group' in kernel/sched.c)
868 */
869 unsigned long cpumask[0];
870 };
871
872 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
873 {
874 return to_cpumask(sg->cpumask);
875 }
876
877 enum sched_domain_level {
878 SD_LV_NONE = 0,
879 SD_LV_SIBLING,
880 SD_LV_MC,
881 SD_LV_BOOK,
882 SD_LV_CPU,
883 SD_LV_NODE,
884 SD_LV_ALLNODES,
885 SD_LV_MAX
886 };
887
888 struct sched_domain_attr {
889 int relax_domain_level;
890 };
891
892 #define SD_ATTR_INIT (struct sched_domain_attr) { \
893 .relax_domain_level = -1, \
894 }
895
896 struct sched_domain {
897 /* These fields must be setup */
898 struct sched_domain *parent; /* top domain must be null terminated */
899 struct sched_domain *child; /* bottom domain must be null terminated */
900 struct sched_group *groups; /* the balancing groups of the domain */
901 unsigned long min_interval; /* Minimum balance interval ms */
902 unsigned long max_interval; /* Maximum balance interval ms */
903 unsigned int busy_factor; /* less balancing by factor if busy */
904 unsigned int imbalance_pct; /* No balance until over watermark */
905 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
906 unsigned int busy_idx;
907 unsigned int idle_idx;
908 unsigned int newidle_idx;
909 unsigned int wake_idx;
910 unsigned int forkexec_idx;
911 unsigned int smt_gain;
912 int flags; /* See SD_* */
913 enum sched_domain_level level;
914
915 /* Runtime fields. */
916 unsigned long last_balance; /* init to jiffies. units in jiffies */
917 unsigned int balance_interval; /* initialise to 1. units in ms. */
918 unsigned int nr_balance_failed; /* initialise to 0 */
919
920 u64 last_update;
921
922 #ifdef CONFIG_SCHEDSTATS
923 /* load_balance() stats */
924 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
925 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
926 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
927 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
928 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
929 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
930 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
931 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
932
933 /* Active load balancing */
934 unsigned int alb_count;
935 unsigned int alb_failed;
936 unsigned int alb_pushed;
937
938 /* SD_BALANCE_EXEC stats */
939 unsigned int sbe_count;
940 unsigned int sbe_balanced;
941 unsigned int sbe_pushed;
942
943 /* SD_BALANCE_FORK stats */
944 unsigned int sbf_count;
945 unsigned int sbf_balanced;
946 unsigned int sbf_pushed;
947
948 /* try_to_wake_up() stats */
949 unsigned int ttwu_wake_remote;
950 unsigned int ttwu_move_affine;
951 unsigned int ttwu_move_balance;
952 #endif
953 #ifdef CONFIG_SCHED_DEBUG
954 char *name;
955 #endif
956
957 unsigned int span_weight;
958 /*
959 * Span of all CPUs in this domain.
960 *
961 * NOTE: this field is variable length. (Allocated dynamically
962 * by attaching extra space to the end of the structure,
963 * depending on how many CPUs the kernel has booted up with)
964 *
965 * It is also be embedded into static data structures at build
966 * time. (See 'struct static_sched_domain' in kernel/sched.c)
967 */
968 unsigned long span[0];
969 };
970
971 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
972 {
973 return to_cpumask(sd->span);
974 }
975
976 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
977 struct sched_domain_attr *dattr_new);
978
979 /* Allocate an array of sched domains, for partition_sched_domains(). */
980 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
981 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
982
983 /* Test a flag in parent sched domain */
984 static inline int test_sd_parent(struct sched_domain *sd, int flag)
985 {
986 if (sd->parent && (sd->parent->flags & flag))
987 return 1;
988
989 return 0;
990 }
991
992 unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
993 unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
994
995 #else /* CONFIG_SMP */
996
997 struct sched_domain_attr;
998
999 static inline void
1000 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1001 struct sched_domain_attr *dattr_new)
1002 {
1003 }
1004 #endif /* !CONFIG_SMP */
1005
1006
1007 struct io_context; /* See blkdev.h */
1008
1009
1010 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1011 extern void prefetch_stack(struct task_struct *t);
1012 #else
1013 static inline void prefetch_stack(struct task_struct *t) { }
1014 #endif
1015
1016 struct audit_context; /* See audit.c */
1017 struct mempolicy;
1018 struct pipe_inode_info;
1019 struct uts_namespace;
1020
1021 struct rq;
1022 struct sched_domain;
1023
1024 /*
1025 * wake flags
1026 */
1027 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
1028 #define WF_FORK 0x02 /* child wakeup after fork */
1029
1030 #define ENQUEUE_WAKEUP 1
1031 #define ENQUEUE_WAKING 2
1032 #define ENQUEUE_HEAD 4
1033
1034 #define DEQUEUE_SLEEP 1
1035
1036 struct sched_class {
1037 const struct sched_class *next;
1038
1039 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
1040 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
1041 void (*yield_task) (struct rq *rq);
1042
1043 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
1044
1045 struct task_struct * (*pick_next_task) (struct rq *rq);
1046 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
1047
1048 #ifdef CONFIG_SMP
1049 int (*select_task_rq)(struct rq *rq, struct task_struct *p,
1050 int sd_flag, int flags);
1051
1052 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1053 void (*post_schedule) (struct rq *this_rq);
1054 void (*task_waking) (struct rq *this_rq, struct task_struct *task);
1055 void (*task_woken) (struct rq *this_rq, struct task_struct *task);
1056
1057 void (*set_cpus_allowed)(struct task_struct *p,
1058 const struct cpumask *newmask);
1059
1060 void (*rq_online)(struct rq *rq);
1061 void (*rq_offline)(struct rq *rq);
1062 #endif
1063
1064 void (*set_curr_task) (struct rq *rq);
1065 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1066 void (*task_fork) (struct task_struct *p);
1067
1068 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
1069 int running);
1070 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
1071 int running);
1072 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1073 int oldprio, int running);
1074
1075 unsigned int (*get_rr_interval) (struct rq *rq,
1076 struct task_struct *task);
1077
1078 #ifdef CONFIG_FAIR_GROUP_SCHED
1079 void (*moved_group) (struct task_struct *p, int on_rq);
1080 #endif
1081 };
1082
1083 struct load_weight {
1084 unsigned long weight, inv_weight;
1085 };
1086
1087 #ifdef CONFIG_SCHEDSTATS
1088 struct sched_statistics {
1089 u64 wait_start;
1090 u64 wait_max;
1091 u64 wait_count;
1092 u64 wait_sum;
1093 u64 iowait_count;
1094 u64 iowait_sum;
1095
1096 u64 sleep_start;
1097 u64 sleep_max;
1098 s64 sum_sleep_runtime;
1099
1100 u64 block_start;
1101 u64 block_max;
1102 u64 exec_max;
1103 u64 slice_max;
1104
1105 u64 nr_migrations_cold;
1106 u64 nr_failed_migrations_affine;
1107 u64 nr_failed_migrations_running;
1108 u64 nr_failed_migrations_hot;
1109 u64 nr_forced_migrations;
1110
1111 u64 nr_wakeups;
1112 u64 nr_wakeups_sync;
1113 u64 nr_wakeups_migrate;
1114 u64 nr_wakeups_local;
1115 u64 nr_wakeups_remote;
1116 u64 nr_wakeups_affine;
1117 u64 nr_wakeups_affine_attempts;
1118 u64 nr_wakeups_passive;
1119 u64 nr_wakeups_idle;
1120 };
1121 #endif
1122
1123 struct sched_entity {
1124 struct load_weight load; /* for load-balancing */
1125 struct rb_node run_node;
1126 struct list_head group_node;
1127 unsigned int on_rq;
1128
1129 u64 exec_start;
1130 u64 sum_exec_runtime;
1131 u64 vruntime;
1132 u64 prev_sum_exec_runtime;
1133
1134 u64 nr_migrations;
1135
1136 #ifdef CONFIG_SCHEDSTATS
1137 struct sched_statistics statistics;
1138 #endif
1139
1140 #ifdef CONFIG_FAIR_GROUP_SCHED
1141 struct sched_entity *parent;
1142 /* rq on which this entity is (to be) queued: */
1143 struct cfs_rq *cfs_rq;
1144 /* rq "owned" by this entity/group: */
1145 struct cfs_rq *my_q;
1146 #endif
1147 };
1148
1149 struct sched_rt_entity {
1150 struct list_head run_list;
1151 unsigned long timeout;
1152 unsigned int time_slice;
1153 int nr_cpus_allowed;
1154
1155 struct sched_rt_entity *back;
1156 #ifdef CONFIG_RT_GROUP_SCHED
1157 struct sched_rt_entity *parent;
1158 /* rq on which this entity is (to be) queued: */
1159 struct rt_rq *rt_rq;
1160 /* rq "owned" by this entity/group: */
1161 struct rt_rq *my_q;
1162 #endif
1163 };
1164
1165 struct rcu_node;
1166
1167 enum perf_event_task_context {
1168 perf_invalid_context = -1,
1169 perf_hw_context = 0,
1170 perf_sw_context,
1171 perf_nr_task_contexts,
1172 };
1173
1174 struct task_struct {
1175 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1176 void *stack;
1177 atomic_t usage;
1178 unsigned int flags; /* per process flags, defined below */
1179 unsigned int ptrace;
1180
1181 int lock_depth; /* BKL lock depth */
1182
1183 #ifdef CONFIG_SMP
1184 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1185 int oncpu;
1186 #endif
1187 #endif
1188
1189 int prio, static_prio, normal_prio;
1190 unsigned int rt_priority;
1191 const struct sched_class *sched_class;
1192 struct sched_entity se;
1193 struct sched_rt_entity rt;
1194
1195 #ifdef CONFIG_PREEMPT_NOTIFIERS
1196 /* list of struct preempt_notifier: */
1197 struct hlist_head preempt_notifiers;
1198 #endif
1199
1200 /*
1201 * fpu_counter contains the number of consecutive context switches
1202 * that the FPU is used. If this is over a threshold, the lazy fpu
1203 * saving becomes unlazy to save the trap. This is an unsigned char
1204 * so that after 256 times the counter wraps and the behavior turns
1205 * lazy again; this to deal with bursty apps that only use FPU for
1206 * a short time
1207 */
1208 unsigned char fpu_counter;
1209 #ifdef CONFIG_BLK_DEV_IO_TRACE
1210 unsigned int btrace_seq;
1211 #endif
1212
1213 unsigned int policy;
1214 cpumask_t cpus_allowed;
1215
1216 #ifdef CONFIG_PREEMPT_RCU
1217 int rcu_read_lock_nesting;
1218 char rcu_read_unlock_special;
1219 struct list_head rcu_node_entry;
1220 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1221 #ifdef CONFIG_TREE_PREEMPT_RCU
1222 struct rcu_node *rcu_blocked_node;
1223 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1224
1225 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1226 struct sched_info sched_info;
1227 #endif
1228
1229 struct list_head tasks;
1230 struct plist_node pushable_tasks;
1231
1232 struct mm_struct *mm, *active_mm;
1233 #if defined(SPLIT_RSS_COUNTING)
1234 struct task_rss_stat rss_stat;
1235 #endif
1236 /* task state */
1237 int exit_state;
1238 int exit_code, exit_signal;
1239 int pdeath_signal; /* The signal sent when the parent dies */
1240 /* ??? */
1241 unsigned int personality;
1242 unsigned did_exec:1;
1243 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1244 * execve */
1245 unsigned in_iowait:1;
1246
1247
1248 /* Revert to default priority/policy when forking */
1249 unsigned sched_reset_on_fork:1;
1250
1251 pid_t pid;
1252 pid_t tgid;
1253
1254 #ifdef CONFIG_CC_STACKPROTECTOR
1255 /* Canary value for the -fstack-protector gcc feature */
1256 unsigned long stack_canary;
1257 #endif
1258
1259 /*
1260 * pointers to (original) parent process, youngest child, younger sibling,
1261 * older sibling, respectively. (p->father can be replaced with
1262 * p->real_parent->pid)
1263 */
1264 struct task_struct *real_parent; /* real parent process */
1265 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1266 /*
1267 * children/sibling forms the list of my natural children
1268 */
1269 struct list_head children; /* list of my children */
1270 struct list_head sibling; /* linkage in my parent's children list */
1271 struct task_struct *group_leader; /* threadgroup leader */
1272
1273 /*
1274 * ptraced is the list of tasks this task is using ptrace on.
1275 * This includes both natural children and PTRACE_ATTACH targets.
1276 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1277 */
1278 struct list_head ptraced;
1279 struct list_head ptrace_entry;
1280
1281 /* PID/PID hash table linkage. */
1282 struct pid_link pids[PIDTYPE_MAX];
1283 struct list_head thread_group;
1284
1285 struct completion *vfork_done; /* for vfork() */
1286 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1287 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1288
1289 cputime_t utime, stime, utimescaled, stimescaled;
1290 cputime_t gtime;
1291 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
1292 cputime_t prev_utime, prev_stime;
1293 #endif
1294 unsigned long nvcsw, nivcsw; /* context switch counts */
1295 struct timespec start_time; /* monotonic time */
1296 struct timespec real_start_time; /* boot based time */
1297 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1298 unsigned long min_flt, maj_flt;
1299
1300 struct task_cputime cputime_expires;
1301 struct list_head cpu_timers[3];
1302
1303 /* process credentials */
1304 const struct cred __rcu *real_cred; /* objective and real subjective task
1305 * credentials (COW) */
1306 const struct cred __rcu *cred; /* effective (overridable) subjective task
1307 * credentials (COW) */
1308 struct mutex cred_guard_mutex; /* guard against foreign influences on
1309 * credential calculations
1310 * (notably. ptrace) */
1311 struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
1312
1313 char comm[TASK_COMM_LEN]; /* executable name excluding path
1314 - access with [gs]et_task_comm (which lock
1315 it with task_lock())
1316 - initialized normally by setup_new_exec */
1317 /* file system info */
1318 int link_count, total_link_count;
1319 #ifdef CONFIG_SYSVIPC
1320 /* ipc stuff */
1321 struct sysv_sem sysvsem;
1322 #endif
1323 #ifdef CONFIG_DETECT_HUNG_TASK
1324 /* hung task detection */
1325 unsigned long last_switch_count;
1326 #endif
1327 /* CPU-specific state of this task */
1328 struct thread_struct thread;
1329 /* filesystem information */
1330 struct fs_struct *fs;
1331 /* open file information */
1332 struct files_struct *files;
1333 /* namespaces */
1334 struct nsproxy *nsproxy;
1335 /* signal handlers */
1336 struct signal_struct *signal;
1337 struct sighand_struct *sighand;
1338
1339 sigset_t blocked, real_blocked;
1340 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1341 struct sigpending pending;
1342
1343 unsigned long sas_ss_sp;
1344 size_t sas_ss_size;
1345 int (*notifier)(void *priv);
1346 void *notifier_data;
1347 sigset_t *notifier_mask;
1348 struct audit_context *audit_context;
1349 #ifdef CONFIG_AUDITSYSCALL
1350 uid_t loginuid;
1351 unsigned int sessionid;
1352 #endif
1353 seccomp_t seccomp;
1354
1355 /* Thread group tracking */
1356 u32 parent_exec_id;
1357 u32 self_exec_id;
1358 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1359 * mempolicy */
1360 spinlock_t alloc_lock;
1361
1362 #ifdef CONFIG_GENERIC_HARDIRQS
1363 /* IRQ handler threads */
1364 struct irqaction *irqaction;
1365 #endif
1366
1367 /* Protection of the PI data structures: */
1368 raw_spinlock_t pi_lock;
1369
1370 #ifdef CONFIG_RT_MUTEXES
1371 /* PI waiters blocked on a rt_mutex held by this task */
1372 struct plist_head pi_waiters;
1373 /* Deadlock detection and priority inheritance handling */
1374 struct rt_mutex_waiter *pi_blocked_on;
1375 #endif
1376
1377 #ifdef CONFIG_DEBUG_MUTEXES
1378 /* mutex deadlock detection */
1379 struct mutex_waiter *blocked_on;
1380 #endif
1381 #ifdef CONFIG_TRACE_IRQFLAGS
1382 unsigned int irq_events;
1383 unsigned long hardirq_enable_ip;
1384 unsigned long hardirq_disable_ip;
1385 unsigned int hardirq_enable_event;
1386 unsigned int hardirq_disable_event;
1387 int hardirqs_enabled;
1388 int hardirq_context;
1389 unsigned long softirq_disable_ip;
1390 unsigned long softirq_enable_ip;
1391 unsigned int softirq_disable_event;
1392 unsigned int softirq_enable_event;
1393 int softirqs_enabled;
1394 int softirq_context;
1395 #endif
1396 #ifdef CONFIG_LOCKDEP
1397 # define MAX_LOCK_DEPTH 48UL
1398 u64 curr_chain_key;
1399 int lockdep_depth;
1400 unsigned int lockdep_recursion;
1401 struct held_lock held_locks[MAX_LOCK_DEPTH];
1402 gfp_t lockdep_reclaim_gfp;
1403 #endif
1404
1405 /* journalling filesystem info */
1406 void *journal_info;
1407
1408 /* stacked block device info */
1409 struct bio_list *bio_list;
1410
1411 /* VM state */
1412 struct reclaim_state *reclaim_state;
1413
1414 struct backing_dev_info *backing_dev_info;
1415
1416 struct io_context *io_context;
1417
1418 unsigned long ptrace_message;
1419 siginfo_t *last_siginfo; /* For ptrace use. */
1420 struct task_io_accounting ioac;
1421 #if defined(CONFIG_TASK_XACCT)
1422 u64 acct_rss_mem1; /* accumulated rss usage */
1423 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1424 cputime_t acct_timexpd; /* stime + utime since last update */
1425 #endif
1426 #ifdef CONFIG_CPUSETS
1427 nodemask_t mems_allowed; /* Protected by alloc_lock */
1428 int mems_allowed_change_disable;
1429 int cpuset_mem_spread_rotor;
1430 int cpuset_slab_spread_rotor;
1431 #endif
1432 #ifdef CONFIG_CGROUPS
1433 /* Control Group info protected by css_set_lock */
1434 struct css_set __rcu *cgroups;
1435 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1436 struct list_head cg_list;
1437 #endif
1438 #ifdef CONFIG_FUTEX
1439 struct robust_list_head __user *robust_list;
1440 #ifdef CONFIG_COMPAT
1441 struct compat_robust_list_head __user *compat_robust_list;
1442 #endif
1443 struct list_head pi_state_list;
1444 struct futex_pi_state *pi_state_cache;
1445 #endif
1446 #ifdef CONFIG_PERF_EVENTS
1447 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1448 struct mutex perf_event_mutex;
1449 struct list_head perf_event_list;
1450 #endif
1451 #ifdef CONFIG_NUMA
1452 struct mempolicy *mempolicy; /* Protected by alloc_lock */
1453 short il_next;
1454 #endif
1455 atomic_t fs_excl; /* holding fs exclusive resources */
1456 struct rcu_head rcu;
1457
1458 /*
1459 * cache last used pipe for splice
1460 */
1461 struct pipe_inode_info *splice_pipe;
1462 #ifdef CONFIG_TASK_DELAY_ACCT
1463 struct task_delay_info *delays;
1464 #endif
1465 #ifdef CONFIG_FAULT_INJECTION
1466 int make_it_fail;
1467 #endif
1468 struct prop_local_single dirties;
1469 #ifdef CONFIG_LATENCYTOP
1470 int latency_record_count;
1471 struct latency_record latency_record[LT_SAVECOUNT];
1472 #endif
1473 /*
1474 * time slack values; these are used to round up poll() and
1475 * select() etc timeout values. These are in nanoseconds.
1476 */
1477 unsigned long timer_slack_ns;
1478 unsigned long default_timer_slack_ns;
1479
1480 struct list_head *scm_work_list;
1481 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1482 /* Index of current stored address in ret_stack */
1483 int curr_ret_stack;
1484 /* Stack of return addresses for return function tracing */
1485 struct ftrace_ret_stack *ret_stack;
1486 /* time stamp for last schedule */
1487 unsigned long long ftrace_timestamp;
1488 /*
1489 * Number of functions that haven't been traced
1490 * because of depth overrun.
1491 */
1492 atomic_t trace_overrun;
1493 /* Pause for the tracing */
1494 atomic_t tracing_graph_pause;
1495 #endif
1496 #ifdef CONFIG_TRACING
1497 /* state flags for use by tracers */
1498 unsigned long trace;
1499 /* bitmask of trace recursion */
1500 unsigned long trace_recursion;
1501 #endif /* CONFIG_TRACING */
1502 #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
1503 struct memcg_batch_info {
1504 int do_batch; /* incremented when batch uncharge started */
1505 struct mem_cgroup *memcg; /* target memcg of uncharge */
1506 unsigned long bytes; /* uncharged usage */
1507 unsigned long memsw_bytes; /* uncharged mem+swap usage */
1508 } memcg_batch;
1509 #endif
1510 };
1511
1512 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1513 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1514
1515 /*
1516 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1517 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1518 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1519 * values are inverted: lower p->prio value means higher priority.
1520 *
1521 * The MAX_USER_RT_PRIO value allows the actual maximum
1522 * RT priority to be separate from the value exported to
1523 * user-space. This allows kernel threads to set their
1524 * priority to a value higher than any user task. Note:
1525 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1526 */
1527
1528 #define MAX_USER_RT_PRIO 100
1529 #define MAX_RT_PRIO MAX_USER_RT_PRIO
1530
1531 #define MAX_PRIO (MAX_RT_PRIO + 40)
1532 #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1533
1534 static inline int rt_prio(int prio)
1535 {
1536 if (unlikely(prio < MAX_RT_PRIO))
1537 return 1;
1538 return 0;
1539 }
1540
1541 static inline int rt_task(struct task_struct *p)
1542 {
1543 return rt_prio(p->prio);
1544 }
1545
1546 static inline struct pid *task_pid(struct task_struct *task)
1547 {
1548 return task->pids[PIDTYPE_PID].pid;
1549 }
1550
1551 static inline struct pid *task_tgid(struct task_struct *task)
1552 {
1553 return task->group_leader->pids[PIDTYPE_PID].pid;
1554 }
1555
1556 /*
1557 * Without tasklist or rcu lock it is not safe to dereference
1558 * the result of task_pgrp/task_session even if task == current,
1559 * we can race with another thread doing sys_setsid/sys_setpgid.
1560 */
1561 static inline struct pid *task_pgrp(struct task_struct *task)
1562 {
1563 return task->group_leader->pids[PIDTYPE_PGID].pid;
1564 }
1565
1566 static inline struct pid *task_session(struct task_struct *task)
1567 {
1568 return task->group_leader->pids[PIDTYPE_SID].pid;
1569 }
1570
1571 struct pid_namespace;
1572
1573 /*
1574 * the helpers to get the task's different pids as they are seen
1575 * from various namespaces
1576 *
1577 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1578 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1579 * current.
1580 * task_xid_nr_ns() : id seen from the ns specified;
1581 *
1582 * set_task_vxid() : assigns a virtual id to a task;
1583 *
1584 * see also pid_nr() etc in include/linux/pid.h
1585 */
1586 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1587 struct pid_namespace *ns);
1588
1589 static inline pid_t task_pid_nr(struct task_struct *tsk)
1590 {
1591 return tsk->pid;
1592 }
1593
1594 static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1595 struct pid_namespace *ns)
1596 {
1597 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1598 }
1599
1600 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1601 {
1602 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1603 }
1604
1605
1606 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1607 {
1608 return tsk->tgid;
1609 }
1610
1611 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1612
1613 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1614 {
1615 return pid_vnr(task_tgid(tsk));
1616 }
1617
1618
1619 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1620 struct pid_namespace *ns)
1621 {
1622 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1623 }
1624
1625 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1626 {
1627 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1628 }
1629
1630
1631 static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1632 struct pid_namespace *ns)
1633 {
1634 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1635 }
1636
1637 static inline pid_t task_session_vnr(struct task_struct *tsk)
1638 {
1639 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1640 }
1641
1642 /* obsolete, do not use */
1643 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1644 {
1645 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1646 }
1647
1648 /**
1649 * pid_alive - check that a task structure is not stale
1650 * @p: Task structure to be checked.
1651 *
1652 * Test if a process is not yet dead (at most zombie state)
1653 * If pid_alive fails, then pointers within the task structure
1654 * can be stale and must not be dereferenced.
1655 */
1656 static inline int pid_alive(struct task_struct *p)
1657 {
1658 return p->pids[PIDTYPE_PID].pid != NULL;
1659 }
1660
1661 /**
1662 * is_global_init - check if a task structure is init
1663 * @tsk: Task structure to be checked.
1664 *
1665 * Check if a task structure is the first user space task the kernel created.
1666 */
1667 static inline int is_global_init(struct task_struct *tsk)
1668 {
1669 return tsk->pid == 1;
1670 }
1671
1672 /*
1673 * is_container_init:
1674 * check whether in the task is init in its own pid namespace.
1675 */
1676 extern int is_container_init(struct task_struct *tsk);
1677
1678 extern struct pid *cad_pid;
1679
1680 extern void free_task(struct task_struct *tsk);
1681 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1682
1683 extern void __put_task_struct(struct task_struct *t);
1684
1685 static inline void put_task_struct(struct task_struct *t)
1686 {
1687 if (atomic_dec_and_test(&t->usage))
1688 __put_task_struct(t);
1689 }
1690
1691 extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1692 extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1693
1694 /*
1695 * Per process flags
1696 */
1697 #define PF_KSOFTIRQD 0x00000001 /* I am ksoftirqd */
1698 #define PF_STARTING 0x00000002 /* being created */
1699 #define PF_EXITING 0x00000004 /* getting shut down */
1700 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1701 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1702 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1703 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1704 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1705 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1706 #define PF_DUMPCORE 0x00000200 /* dumped core */
1707 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1708 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1709 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1710 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1711 #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */
1712 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1713 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1714 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1715 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1716 #define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */
1717 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1718 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1719 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1720 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1721 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1722 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1723 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
1724 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1725 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1726 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1727 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1728 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1729
1730 /*
1731 * Only the _current_ task can read/write to tsk->flags, but other
1732 * tasks can access tsk->flags in readonly mode for example
1733 * with tsk_used_math (like during threaded core dumping).
1734 * There is however an exception to this rule during ptrace
1735 * or during fork: the ptracer task is allowed to write to the
1736 * child->flags of its traced child (same goes for fork, the parent
1737 * can write to the child->flags), because we're guaranteed the
1738 * child is not running and in turn not changing child->flags
1739 * at the same time the parent does it.
1740 */
1741 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1742 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1743 #define clear_used_math() clear_stopped_child_used_math(current)
1744 #define set_used_math() set_stopped_child_used_math(current)
1745 #define conditional_stopped_child_used_math(condition, child) \
1746 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1747 #define conditional_used_math(condition) \
1748 conditional_stopped_child_used_math(condition, current)
1749 #define copy_to_stopped_child_used_math(child) \
1750 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1751 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1752 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1753 #define used_math() tsk_used_math(current)
1754
1755 #ifdef CONFIG_PREEMPT_RCU
1756
1757 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1758 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1759
1760 static inline void rcu_copy_process(struct task_struct *p)
1761 {
1762 p->rcu_read_lock_nesting = 0;
1763 p->rcu_read_unlock_special = 0;
1764 #ifdef CONFIG_TREE_PREEMPT_RCU
1765 p->rcu_blocked_node = NULL;
1766 #endif
1767 INIT_LIST_HEAD(&p->rcu_node_entry);
1768 }
1769
1770 #else
1771
1772 static inline void rcu_copy_process(struct task_struct *p)
1773 {
1774 }
1775
1776 #endif
1777
1778 #ifdef CONFIG_SMP
1779 extern int set_cpus_allowed_ptr(struct task_struct *p,
1780 const struct cpumask *new_mask);
1781 #else
1782 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1783 const struct cpumask *new_mask)
1784 {
1785 if (!cpumask_test_cpu(0, new_mask))
1786 return -EINVAL;
1787 return 0;
1788 }
1789 #endif
1790
1791 #ifndef CONFIG_CPUMASK_OFFSTACK
1792 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1793 {
1794 return set_cpus_allowed_ptr(p, &new_mask);
1795 }
1796 #endif
1797
1798 /*
1799 * Do not use outside of architecture code which knows its limitations.
1800 *
1801 * sched_clock() has no promise of monotonicity or bounded drift between
1802 * CPUs, use (which you should not) requires disabling IRQs.
1803 *
1804 * Please use one of the three interfaces below.
1805 */
1806 extern unsigned long long notrace sched_clock(void);
1807 /*
1808 * See the comment in kernel/sched_clock.c
1809 */
1810 extern u64 cpu_clock(int cpu);
1811 extern u64 local_clock(void);
1812 extern u64 sched_clock_cpu(int cpu);
1813
1814
1815 extern void sched_clock_init(void);
1816
1817 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1818 static inline void sched_clock_tick(void)
1819 {
1820 }
1821
1822 static inline void sched_clock_idle_sleep_event(void)
1823 {
1824 }
1825
1826 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1827 {
1828 }
1829 #else
1830 /*
1831 * Architectures can set this to 1 if they have specified
1832 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1833 * but then during bootup it turns out that sched_clock()
1834 * is reliable after all:
1835 */
1836 extern int sched_clock_stable;
1837
1838 extern void sched_clock_tick(void);
1839 extern void sched_clock_idle_sleep_event(void);
1840 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1841 #endif
1842
1843 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1844 /*
1845 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1846 * The reason for this explicit opt-in is not to have perf penalty with
1847 * slow sched_clocks.
1848 */
1849 extern void enable_sched_clock_irqtime(void);
1850 extern void disable_sched_clock_irqtime(void);
1851 #else
1852 static inline void enable_sched_clock_irqtime(void) {}
1853 static inline void disable_sched_clock_irqtime(void) {}
1854 #endif
1855
1856 extern unsigned long long
1857 task_sched_runtime(struct task_struct *task);
1858 extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1859
1860 /* sched_exec is called by processes performing an exec */
1861 #ifdef CONFIG_SMP
1862 extern void sched_exec(void);
1863 #else
1864 #define sched_exec() {}
1865 #endif
1866
1867 extern void sched_clock_idle_sleep_event(void);
1868 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1869
1870 #ifdef CONFIG_HOTPLUG_CPU
1871 extern void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p);
1872 extern void idle_task_exit(void);
1873 #else
1874 static inline void idle_task_exit(void) {}
1875 #endif
1876
1877 extern void sched_idle_next(void);
1878
1879 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1880 extern void wake_up_idle_cpu(int cpu);
1881 #else
1882 static inline void wake_up_idle_cpu(int cpu) { }
1883 #endif
1884
1885 extern unsigned int sysctl_sched_latency;
1886 extern unsigned int sysctl_sched_min_granularity;
1887 extern unsigned int sysctl_sched_wakeup_granularity;
1888 extern unsigned int sysctl_sched_shares_ratelimit;
1889 extern unsigned int sysctl_sched_shares_thresh;
1890 extern unsigned int sysctl_sched_child_runs_first;
1891
1892 enum sched_tunable_scaling {
1893 SCHED_TUNABLESCALING_NONE,
1894 SCHED_TUNABLESCALING_LOG,
1895 SCHED_TUNABLESCALING_LINEAR,
1896 SCHED_TUNABLESCALING_END,
1897 };
1898 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
1899
1900 #ifdef CONFIG_SCHED_DEBUG
1901 extern unsigned int sysctl_sched_migration_cost;
1902 extern unsigned int sysctl_sched_nr_migrate;
1903 extern unsigned int sysctl_sched_time_avg;
1904 extern unsigned int sysctl_timer_migration;
1905
1906 int sched_proc_update_handler(struct ctl_table *table, int write,
1907 void __user *buffer, size_t *length,
1908 loff_t *ppos);
1909 #endif
1910 #ifdef CONFIG_SCHED_DEBUG
1911 static inline unsigned int get_sysctl_timer_migration(void)
1912 {
1913 return sysctl_timer_migration;
1914 }
1915 #else
1916 static inline unsigned int get_sysctl_timer_migration(void)
1917 {
1918 return 1;
1919 }
1920 #endif
1921 extern unsigned int sysctl_sched_rt_period;
1922 extern int sysctl_sched_rt_runtime;
1923
1924 int sched_rt_handler(struct ctl_table *table, int write,
1925 void __user *buffer, size_t *lenp,
1926 loff_t *ppos);
1927
1928 extern unsigned int sysctl_sched_compat_yield;
1929
1930 #ifdef CONFIG_RT_MUTEXES
1931 extern int rt_mutex_getprio(struct task_struct *p);
1932 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1933 extern void rt_mutex_adjust_pi(struct task_struct *p);
1934 #else
1935 static inline int rt_mutex_getprio(struct task_struct *p)
1936 {
1937 return p->normal_prio;
1938 }
1939 # define rt_mutex_adjust_pi(p) do { } while (0)
1940 #endif
1941
1942 extern void set_user_nice(struct task_struct *p, long nice);
1943 extern int task_prio(const struct task_struct *p);
1944 extern int task_nice(const struct task_struct *p);
1945 extern int can_nice(const struct task_struct *p, const int nice);
1946 extern int task_curr(const struct task_struct *p);
1947 extern int idle_cpu(int cpu);
1948 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1949 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1950 struct sched_param *);
1951 extern struct task_struct *idle_task(int cpu);
1952 extern struct task_struct *curr_task(int cpu);
1953 extern void set_curr_task(int cpu, struct task_struct *p);
1954
1955 void yield(void);
1956
1957 /*
1958 * The default (Linux) execution domain.
1959 */
1960 extern struct exec_domain default_exec_domain;
1961
1962 union thread_union {
1963 struct thread_info thread_info;
1964 unsigned long stack[THREAD_SIZE/sizeof(long)];
1965 };
1966
1967 #ifndef __HAVE_ARCH_KSTACK_END
1968 static inline int kstack_end(void *addr)
1969 {
1970 /* Reliable end of stack detection:
1971 * Some APM bios versions misalign the stack
1972 */
1973 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1974 }
1975 #endif
1976
1977 extern union thread_union init_thread_union;
1978 extern struct task_struct init_task;
1979
1980 extern struct mm_struct init_mm;
1981
1982 extern struct pid_namespace init_pid_ns;
1983
1984 /*
1985 * find a task by one of its numerical ids
1986 *
1987 * find_task_by_pid_ns():
1988 * finds a task by its pid in the specified namespace
1989 * find_task_by_vpid():
1990 * finds a task by its virtual pid
1991 *
1992 * see also find_vpid() etc in include/linux/pid.h
1993 */
1994
1995 extern struct task_struct *find_task_by_vpid(pid_t nr);
1996 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1997 struct pid_namespace *ns);
1998
1999 extern void __set_special_pids(struct pid *pid);
2000
2001 /* per-UID process charging. */
2002 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
2003 static inline struct user_struct *get_uid(struct user_struct *u)
2004 {
2005 atomic_inc(&u->__count);
2006 return u;
2007 }
2008 extern void free_uid(struct user_struct *);
2009 extern void release_uids(struct user_namespace *ns);
2010
2011 #include <asm/current.h>
2012
2013 extern void do_timer(unsigned long ticks);
2014
2015 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2016 extern int wake_up_process(struct task_struct *tsk);
2017 extern void wake_up_new_task(struct task_struct *tsk,
2018 unsigned long clone_flags);
2019 #ifdef CONFIG_SMP
2020 extern void kick_process(struct task_struct *tsk);
2021 #else
2022 static inline void kick_process(struct task_struct *tsk) { }
2023 #endif
2024 extern void sched_fork(struct task_struct *p, int clone_flags);
2025 extern void sched_dead(struct task_struct *p);
2026
2027 extern void proc_caches_init(void);
2028 extern void flush_signals(struct task_struct *);
2029 extern void __flush_signals(struct task_struct *);
2030 extern void ignore_signals(struct task_struct *);
2031 extern void flush_signal_handlers(struct task_struct *, int force_default);
2032 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2033
2034 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2035 {
2036 unsigned long flags;
2037 int ret;
2038
2039 spin_lock_irqsave(&tsk->sighand->siglock, flags);
2040 ret = dequeue_signal(tsk, mask, info);
2041 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2042
2043 return ret;
2044 }
2045
2046 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2047 sigset_t *mask);
2048 extern void unblock_all_signals(void);
2049 extern void release_task(struct task_struct * p);
2050 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2051 extern int force_sigsegv(int, struct task_struct *);
2052 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2053 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2054 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2055 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
2056 extern int kill_pgrp(struct pid *pid, int sig, int priv);
2057 extern int kill_pid(struct pid *pid, int sig, int priv);
2058 extern int kill_proc_info(int, struct siginfo *, pid_t);
2059 extern int do_notify_parent(struct task_struct *, int);
2060 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2061 extern void force_sig(int, struct task_struct *);
2062 extern int send_sig(int, struct task_struct *, int);
2063 extern int zap_other_threads(struct task_struct *p);
2064 extern struct sigqueue *sigqueue_alloc(void);
2065 extern void sigqueue_free(struct sigqueue *);
2066 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
2067 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2068 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
2069
2070 static inline int kill_cad_pid(int sig, int priv)
2071 {
2072 return kill_pid(cad_pid, sig, priv);
2073 }
2074
2075 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2076 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2077 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2078 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2079
2080 /*
2081 * True if we are on the alternate signal stack.
2082 */
2083 static inline int on_sig_stack(unsigned long sp)
2084 {
2085 #ifdef CONFIG_STACK_GROWSUP
2086 return sp >= current->sas_ss_sp &&
2087 sp - current->sas_ss_sp < current->sas_ss_size;
2088 #else
2089 return sp > current->sas_ss_sp &&
2090 sp - current->sas_ss_sp <= current->sas_ss_size;
2091 #endif
2092 }
2093
2094 static inline int sas_ss_flags(unsigned long sp)
2095 {
2096 return (current->sas_ss_size == 0 ? SS_DISABLE
2097 : on_sig_stack(sp) ? SS_ONSTACK : 0);
2098 }
2099
2100 /*
2101 * Routines for handling mm_structs
2102 */
2103 extern struct mm_struct * mm_alloc(void);
2104
2105 /* mmdrop drops the mm and the page tables */
2106 extern void __mmdrop(struct mm_struct *);
2107 static inline void mmdrop(struct mm_struct * mm)
2108 {
2109 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2110 __mmdrop(mm);
2111 }
2112
2113 /* mmput gets rid of the mappings and all user-space */
2114 extern void mmput(struct mm_struct *);
2115 /* Grab a reference to a task's mm, if it is not already going away */
2116 extern struct mm_struct *get_task_mm(struct task_struct *task);
2117 /* Remove the current tasks stale references to the old mm_struct */
2118 extern void mm_release(struct task_struct *, struct mm_struct *);
2119 /* Allocate a new mm structure and copy contents from tsk->mm */
2120 extern struct mm_struct *dup_mm(struct task_struct *tsk);
2121
2122 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2123 struct task_struct *, struct pt_regs *);
2124 extern void flush_thread(void);
2125 extern void exit_thread(void);
2126
2127 extern void exit_files(struct task_struct *);
2128 extern void __cleanup_sighand(struct sighand_struct *);
2129
2130 extern void exit_itimers(struct signal_struct *);
2131 extern void flush_itimer_signals(void);
2132
2133 extern NORET_TYPE void do_group_exit(int);
2134
2135 extern void daemonize(const char *, ...);
2136 extern int allow_signal(int);
2137 extern int disallow_signal(int);
2138
2139 extern int do_execve(const char *,
2140 const char __user * const __user *,
2141 const char __user * const __user *, struct pt_regs *);
2142 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
2143 struct task_struct *fork_idle(int);
2144
2145 extern void set_task_comm(struct task_struct *tsk, char *from);
2146 extern char *get_task_comm(char *to, struct task_struct *tsk);
2147
2148 #ifdef CONFIG_SMP
2149 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2150 #else
2151 static inline unsigned long wait_task_inactive(struct task_struct *p,
2152 long match_state)
2153 {
2154 return 1;
2155 }
2156 #endif
2157
2158 #define next_task(p) \
2159 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2160
2161 #define for_each_process(p) \
2162 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2163
2164 extern bool current_is_single_threaded(void);
2165
2166 /*
2167 * Careful: do_each_thread/while_each_thread is a double loop so
2168 * 'break' will not work as expected - use goto instead.
2169 */
2170 #define do_each_thread(g, t) \
2171 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2172
2173 #define while_each_thread(g, t) \
2174 while ((t = next_thread(t)) != g)
2175
2176 static inline int get_nr_threads(struct task_struct *tsk)
2177 {
2178 return tsk->signal->nr_threads;
2179 }
2180
2181 /* de_thread depends on thread_group_leader not being a pid based check */
2182 #define thread_group_leader(p) (p == p->group_leader)
2183
2184 /* Do to the insanities of de_thread it is possible for a process
2185 * to have the pid of the thread group leader without actually being
2186 * the thread group leader. For iteration through the pids in proc
2187 * all we care about is that we have a task with the appropriate
2188 * pid, we don't actually care if we have the right task.
2189 */
2190 static inline int has_group_leader_pid(struct task_struct *p)
2191 {
2192 return p->pid == p->tgid;
2193 }
2194
2195 static inline
2196 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2197 {
2198 return p1->tgid == p2->tgid;
2199 }
2200
2201 static inline struct task_struct *next_thread(const struct task_struct *p)
2202 {
2203 return list_entry_rcu(p->thread_group.next,
2204 struct task_struct, thread_group);
2205 }
2206
2207 static inline int thread_group_empty(struct task_struct *p)
2208 {
2209 return list_empty(&p->thread_group);
2210 }
2211
2212 #define delay_group_leader(p) \
2213 (thread_group_leader(p) && !thread_group_empty(p))
2214
2215 static inline int task_detached(struct task_struct *p)
2216 {
2217 return p->exit_signal == -1;
2218 }
2219
2220 /*
2221 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2222 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2223 * pins the final release of task.io_context. Also protects ->cpuset and
2224 * ->cgroup.subsys[].
2225 *
2226 * Nests both inside and outside of read_lock(&tasklist_lock).
2227 * It must not be nested with write_lock_irq(&tasklist_lock),
2228 * neither inside nor outside.
2229 */
2230 static inline void task_lock(struct task_struct *p)
2231 {
2232 spin_lock(&p->alloc_lock);
2233 }
2234
2235 static inline void task_unlock(struct task_struct *p)
2236 {
2237 spin_unlock(&p->alloc_lock);
2238 }
2239
2240 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2241 unsigned long *flags);
2242
2243 static inline void unlock_task_sighand(struct task_struct *tsk,
2244 unsigned long *flags)
2245 {
2246 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2247 }
2248
2249 #ifndef __HAVE_THREAD_FUNCTIONS
2250
2251 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2252 #define task_stack_page(task) ((task)->stack)
2253
2254 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2255 {
2256 *task_thread_info(p) = *task_thread_info(org);
2257 task_thread_info(p)->task = p;
2258 }
2259
2260 static inline unsigned long *end_of_stack(struct task_struct *p)
2261 {
2262 return (unsigned long *)(task_thread_info(p) + 1);
2263 }
2264
2265 #endif
2266
2267 static inline int object_is_on_stack(void *obj)
2268 {
2269 void *stack = task_stack_page(current);
2270
2271 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2272 }
2273
2274 extern void thread_info_cache_init(void);
2275
2276 #ifdef CONFIG_DEBUG_STACK_USAGE
2277 static inline unsigned long stack_not_used(struct task_struct *p)
2278 {
2279 unsigned long *n = end_of_stack(p);
2280
2281 do { /* Skip over canary */
2282 n++;
2283 } while (!*n);
2284
2285 return (unsigned long)n - (unsigned long)end_of_stack(p);
2286 }
2287 #endif
2288
2289 /* set thread flags in other task's structures
2290 * - see asm/thread_info.h for TIF_xxxx flags available
2291 */
2292 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2293 {
2294 set_ti_thread_flag(task_thread_info(tsk), flag);
2295 }
2296
2297 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2298 {
2299 clear_ti_thread_flag(task_thread_info(tsk), flag);
2300 }
2301
2302 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2303 {
2304 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2305 }
2306
2307 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2308 {
2309 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2310 }
2311
2312 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2313 {
2314 return test_ti_thread_flag(task_thread_info(tsk), flag);
2315 }
2316
2317 static inline void set_tsk_need_resched(struct task_struct *tsk)
2318 {
2319 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2320 }
2321
2322 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2323 {
2324 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2325 }
2326
2327 static inline int test_tsk_need_resched(struct task_struct *tsk)
2328 {
2329 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2330 }
2331
2332 static inline int restart_syscall(void)
2333 {
2334 set_tsk_thread_flag(current, TIF_SIGPENDING);
2335 return -ERESTARTNOINTR;
2336 }
2337
2338 static inline int signal_pending(struct task_struct *p)
2339 {
2340 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2341 }
2342
2343 static inline int __fatal_signal_pending(struct task_struct *p)
2344 {
2345 return unlikely(sigismember(&p->pending.signal, SIGKILL));
2346 }
2347
2348 static inline int fatal_signal_pending(struct task_struct *p)
2349 {
2350 return signal_pending(p) && __fatal_signal_pending(p);
2351 }
2352
2353 static inline int signal_pending_state(long state, struct task_struct *p)
2354 {
2355 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2356 return 0;
2357 if (!signal_pending(p))
2358 return 0;
2359
2360 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2361 }
2362
2363 static inline int need_resched(void)
2364 {
2365 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2366 }
2367
2368 /*
2369 * cond_resched() and cond_resched_lock(): latency reduction via
2370 * explicit rescheduling in places that are safe. The return
2371 * value indicates whether a reschedule was done in fact.
2372 * cond_resched_lock() will drop the spinlock before scheduling,
2373 * cond_resched_softirq() will enable bhs before scheduling.
2374 */
2375 extern int _cond_resched(void);
2376
2377 #define cond_resched() ({ \
2378 __might_sleep(__FILE__, __LINE__, 0); \
2379 _cond_resched(); \
2380 })
2381
2382 extern int __cond_resched_lock(spinlock_t *lock);
2383
2384 #ifdef CONFIG_PREEMPT
2385 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2386 #else
2387 #define PREEMPT_LOCK_OFFSET 0
2388 #endif
2389
2390 #define cond_resched_lock(lock) ({ \
2391 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2392 __cond_resched_lock(lock); \
2393 })
2394
2395 extern int __cond_resched_softirq(void);
2396
2397 #define cond_resched_softirq() ({ \
2398 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2399 __cond_resched_softirq(); \
2400 })
2401
2402 /*
2403 * Does a critical section need to be broken due to another
2404 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2405 * but a general need for low latency)
2406 */
2407 static inline int spin_needbreak(spinlock_t *lock)
2408 {
2409 #ifdef CONFIG_PREEMPT
2410 return spin_is_contended(lock);
2411 #else
2412 return 0;
2413 #endif
2414 }
2415
2416 /*
2417 * Thread group CPU time accounting.
2418 */
2419 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2420 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2421
2422 static inline void thread_group_cputime_init(struct signal_struct *sig)
2423 {
2424 spin_lock_init(&sig->cputimer.lock);
2425 }
2426
2427 /*
2428 * Reevaluate whether the task has signals pending delivery.
2429 * Wake the task if so.
2430 * This is required every time the blocked sigset_t changes.
2431 * callers must hold sighand->siglock.
2432 */
2433 extern void recalc_sigpending_and_wake(struct task_struct *t);
2434 extern void recalc_sigpending(void);
2435
2436 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2437
2438 /*
2439 * Wrappers for p->thread_info->cpu access. No-op on UP.
2440 */
2441 #ifdef CONFIG_SMP
2442
2443 static inline unsigned int task_cpu(const struct task_struct *p)
2444 {
2445 return task_thread_info(p)->cpu;
2446 }
2447
2448 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2449
2450 #else
2451
2452 static inline unsigned int task_cpu(const struct task_struct *p)
2453 {
2454 return 0;
2455 }
2456
2457 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2458 {
2459 }
2460
2461 #endif /* CONFIG_SMP */
2462
2463 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2464 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2465
2466 extern void normalize_rt_tasks(void);
2467
2468 #ifdef CONFIG_CGROUP_SCHED
2469
2470 extern struct task_group init_task_group;
2471
2472 extern struct task_group *sched_create_group(struct task_group *parent);
2473 extern void sched_destroy_group(struct task_group *tg);
2474 extern void sched_move_task(struct task_struct *tsk);
2475 #ifdef CONFIG_FAIR_GROUP_SCHED
2476 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2477 extern unsigned long sched_group_shares(struct task_group *tg);
2478 #endif
2479 #ifdef CONFIG_RT_GROUP_SCHED
2480 extern int sched_group_set_rt_runtime(struct task_group *tg,
2481 long rt_runtime_us);
2482 extern long sched_group_rt_runtime(struct task_group *tg);
2483 extern int sched_group_set_rt_period(struct task_group *tg,
2484 long rt_period_us);
2485 extern long sched_group_rt_period(struct task_group *tg);
2486 extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2487 #endif
2488 #endif
2489
2490 extern int task_can_switch_user(struct user_struct *up,
2491 struct task_struct *tsk);
2492
2493 #ifdef CONFIG_TASK_XACCT
2494 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2495 {
2496 tsk->ioac.rchar += amt;
2497 }
2498
2499 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2500 {
2501 tsk->ioac.wchar += amt;
2502 }
2503
2504 static inline void inc_syscr(struct task_struct *tsk)
2505 {
2506 tsk->ioac.syscr++;
2507 }
2508
2509 static inline void inc_syscw(struct task_struct *tsk)
2510 {
2511 tsk->ioac.syscw++;
2512 }
2513 #else
2514 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2515 {
2516 }
2517
2518 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2519 {
2520 }
2521
2522 static inline void inc_syscr(struct task_struct *tsk)
2523 {
2524 }
2525
2526 static inline void inc_syscw(struct task_struct *tsk)
2527 {
2528 }
2529 #endif
2530
2531 #ifndef TASK_SIZE_OF
2532 #define TASK_SIZE_OF(tsk) TASK_SIZE
2533 #endif
2534
2535 /*
2536 * Call the function if the target task is executing on a CPU right now:
2537 */
2538 extern void task_oncpu_function_call(struct task_struct *p,
2539 void (*func) (void *info), void *info);
2540
2541
2542 #ifdef CONFIG_MM_OWNER
2543 extern void mm_update_next_owner(struct mm_struct *mm);
2544 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2545 #else
2546 static inline void mm_update_next_owner(struct mm_struct *mm)
2547 {
2548 }
2549
2550 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2551 {
2552 }
2553 #endif /* CONFIG_MM_OWNER */
2554
2555 static inline unsigned long task_rlimit(const struct task_struct *tsk,
2556 unsigned int limit)
2557 {
2558 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2559 }
2560
2561 static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2562 unsigned int limit)
2563 {
2564 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2565 }
2566
2567 static inline unsigned long rlimit(unsigned int limit)
2568 {
2569 return task_rlimit(current, limit);
2570 }
2571
2572 static inline unsigned long rlimit_max(unsigned int limit)
2573 {
2574 return task_rlimit_max(current, limit);
2575 }
2576
2577 #endif /* __KERNEL__ */
2578
2579 #endif
Linux kernel - Deliverables
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