sched.h 74 KB

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  1. #ifndef _LINUX_SCHED_H
  2. #define _LINUX_SCHED_H
  3. /*
  4. * cloning flags:
  5. */
  6. #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
  7. #define CLONE_VM 0x00000100 /* set if VM shared between processes */
  8. #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
  9. #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
  10. #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
  11. #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
  12. #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
  13. #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
  14. #define CLONE_THREAD 0x00010000 /* Same thread group? */
  15. #define CLONE_NEWNS 0x00020000 /* New namespace group? */
  16. #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
  17. #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
  18. #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
  19. #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
  20. #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
  21. #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
  22. #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
  23. #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
  24. #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
  25. #define CLONE_NEWIPC 0x08000000 /* New ipcs */
  26. #define CLONE_NEWUSER 0x10000000 /* New user namespace */
  27. #define CLONE_NEWPID 0x20000000 /* New pid namespace */
  28. #define CLONE_NEWNET 0x40000000 /* New network namespace */
  29. #define CLONE_IO 0x80000000 /* Clone io context */
  30. /*
  31. * Scheduling policies
  32. */
  33. #define SCHED_NORMAL 0
  34. #define SCHED_FIFO 1
  35. #define SCHED_RR 2
  36. #define SCHED_BATCH 3
  37. /* SCHED_ISO: reserved but not implemented yet */
  38. #define SCHED_IDLE 5
  39. /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
  40. #define SCHED_RESET_ON_FORK 0x40000000
  41. #ifdef __KERNEL__
  42. struct sched_param {
  43. int sched_priority;
  44. };
  45. #include <asm/param.h> /* for HZ */
  46. #include <linux/capability.h>
  47. #include <linux/threads.h>
  48. #include <linux/kernel.h>
  49. #include <linux/types.h>
  50. #include <linux/timex.h>
  51. #include <linux/jiffies.h>
  52. #include <linux/rbtree.h>
  53. #include <linux/thread_info.h>
  54. #include <linux/cpumask.h>
  55. #include <linux/errno.h>
  56. #include <linux/nodemask.h>
  57. #include <linux/mm_types.h>
  58. #include <asm/system.h>
  59. #include <asm/page.h>
  60. #include <asm/ptrace.h>
  61. #include <asm/cputime.h>
  62. #include <linux/smp.h>
  63. #include <linux/sem.h>
  64. #include <linux/signal.h>
  65. #include <linux/path.h>
  66. #include <linux/compiler.h>
  67. #include <linux/completion.h>
  68. #include <linux/pid.h>
  69. #include <linux/percpu.h>
  70. #include <linux/topology.h>
  71. #include <linux/proportions.h>
  72. #include <linux/seccomp.h>
  73. #include <linux/rcupdate.h>
  74. #include <linux/rculist.h>
  75. #include <linux/rtmutex.h>
  76. #include <linux/time.h>
  77. #include <linux/param.h>
  78. #include <linux/resource.h>
  79. #include <linux/timer.h>
  80. #include <linux/hrtimer.h>
  81. #include <linux/task_io_accounting.h>
  82. #include <linux/kobject.h>
  83. #include <linux/latencytop.h>
  84. #include <linux/cred.h>
  85. #include <asm/processor.h>
  86. struct exec_domain;
  87. struct futex_pi_state;
  88. struct robust_list_head;
  89. struct bio_list;
  90. struct fs_struct;
  91. struct perf_event_context;
  92. /*
  93. * List of flags we want to share for kernel threads,
  94. * if only because they are not used by them anyway.
  95. */
  96. #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
  97. /*
  98. * These are the constant used to fake the fixed-point load-average
  99. * counting. Some notes:
  100. * - 11 bit fractions expand to 22 bits by the multiplies: this gives
  101. * a load-average precision of 10 bits integer + 11 bits fractional
  102. * - if you want to count load-averages more often, you need more
  103. * precision, or rounding will get you. With 2-second counting freq,
  104. * the EXP_n values would be 1981, 2034 and 2043 if still using only
  105. * 11 bit fractions.
  106. */
  107. extern unsigned long avenrun[]; /* Load averages */
  108. extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
  109. #define FSHIFT 11 /* nr of bits of precision */
  110. #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
  111. #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
  112. #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
  113. #define EXP_5 2014 /* 1/exp(5sec/5min) */
  114. #define EXP_15 2037 /* 1/exp(5sec/15min) */
  115. #define CALC_LOAD(load,exp,n) \
  116. load *= exp; \
  117. load += n*(FIXED_1-exp); \
  118. load >>= FSHIFT;
  119. extern unsigned long total_forks;
  120. extern int nr_threads;
  121. DECLARE_PER_CPU(unsigned long, process_counts);
  122. extern int nr_processes(void);
  123. extern unsigned long nr_running(void);
  124. extern unsigned long nr_uninterruptible(void);
  125. extern unsigned long nr_iowait(void);
  126. extern unsigned long nr_iowait_cpu(int cpu);
  127. extern unsigned long this_cpu_load(void);
  128. extern void calc_global_load(void);
  129. extern unsigned long get_parent_ip(unsigned long addr);
  130. struct seq_file;
  131. struct cfs_rq;
  132. struct task_group;
  133. #ifdef CONFIG_SCHED_DEBUG
  134. extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
  135. extern void proc_sched_set_task(struct task_struct *p);
  136. extern void
  137. print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
  138. #else
  139. static inline void
  140. proc_sched_show_task(struct task_struct *p, struct seq_file *m)
  141. {
  142. }
  143. static inline void proc_sched_set_task(struct task_struct *p)
  144. {
  145. }
  146. static inline void
  147. print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
  148. {
  149. }
  150. #endif
  151. /*
  152. * Task state bitmask. NOTE! These bits are also
  153. * encoded in fs/proc/array.c: get_task_state().
  154. *
  155. * We have two separate sets of flags: task->state
  156. * is about runnability, while task->exit_state are
  157. * about the task exiting. Confusing, but this way
  158. * modifying one set can't modify the other one by
  159. * mistake.
  160. */
  161. #define TASK_RUNNING 0
  162. #define TASK_INTERRUPTIBLE 1
  163. #define TASK_UNINTERRUPTIBLE 2
  164. #define __TASK_STOPPED 4
  165. #define __TASK_TRACED 8
  166. /* in tsk->exit_state */
  167. #define EXIT_ZOMBIE 16
  168. #define EXIT_DEAD 32
  169. /* in tsk->state again */
  170. #define TASK_DEAD 64
  171. #define TASK_WAKEKILL 128
  172. #define TASK_WAKING 256
  173. #define TASK_STATE_MAX 512
  174. #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
  175. extern char ___assert_task_state[1 - 2*!!(
  176. sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
  177. /* Convenience macros for the sake of set_task_state */
  178. #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
  179. #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
  180. #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
  181. /* Convenience macros for the sake of wake_up */
  182. #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
  183. #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
  184. /* get_task_state() */
  185. #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
  186. TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
  187. __TASK_TRACED)
  188. #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
  189. #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
  190. #define task_is_dead(task) ((task)->exit_state != 0)
  191. #define task_is_stopped_or_traced(task) \
  192. ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
  193. #define task_contributes_to_load(task) \
  194. ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
  195. (task->flags & PF_FREEZING) == 0)
  196. #define __set_task_state(tsk, state_value) \
  197. do { (tsk)->state = (state_value); } while (0)
  198. #define set_task_state(tsk, state_value) \
  199. set_mb((tsk)->state, (state_value))
  200. /*
  201. * set_current_state() includes a barrier so that the write of current->state
  202. * is correctly serialised wrt the caller's subsequent test of whether to
  203. * actually sleep:
  204. *
  205. * set_current_state(TASK_UNINTERRUPTIBLE);
  206. * if (do_i_need_to_sleep())
  207. * schedule();
  208. *
  209. * If the caller does not need such serialisation then use __set_current_state()
  210. */
  211. #define __set_current_state(state_value) \
  212. do { current->state = (state_value); } while (0)
  213. #define set_current_state(state_value) \
  214. set_mb(current->state, (state_value))
  215. /* Task command name length */
  216. #define TASK_COMM_LEN 16
  217. #include <linux/spinlock.h>
  218. /*
  219. * This serializes "schedule()" and also protects
  220. * the run-queue from deletions/modifications (but
  221. * _adding_ to the beginning of the run-queue has
  222. * a separate lock).
  223. */
  224. extern rwlock_t tasklist_lock;
  225. extern spinlock_t mmlist_lock;
  226. struct task_struct;
  227. #ifdef CONFIG_PROVE_RCU
  228. extern int lockdep_tasklist_lock_is_held(void);
  229. #endif /* #ifdef CONFIG_PROVE_RCU */
  230. extern void sched_init(void);
  231. extern void sched_init_smp(void);
  232. extern asmlinkage void schedule_tail(struct task_struct *prev);
  233. extern void init_idle(struct task_struct *idle, int cpu);
  234. extern void init_idle_bootup_task(struct task_struct *idle);
  235. extern int runqueue_is_locked(int cpu);
  236. extern cpumask_var_t nohz_cpu_mask;
  237. #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
  238. extern void select_nohz_load_balancer(int stop_tick);
  239. extern int get_nohz_timer_target(void);
  240. #else
  241. static inline void select_nohz_load_balancer(int stop_tick) { }
  242. #endif
  243. /*
  244. * Only dump TASK_* tasks. (0 for all tasks)
  245. */
  246. extern void show_state_filter(unsigned long state_filter);
  247. static inline void show_state(void)
  248. {
  249. show_state_filter(0);
  250. }
  251. extern void show_regs(struct pt_regs *);
  252. /*
  253. * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
  254. * task), SP is the stack pointer of the first frame that should be shown in the back
  255. * trace (or NULL if the entire call-chain of the task should be shown).
  256. */
  257. extern void show_stack(struct task_struct *task, unsigned long *sp);
  258. void io_schedule(void);
  259. long io_schedule_timeout(long timeout);
  260. extern void cpu_init (void);
  261. extern void trap_init(void);
  262. extern void update_process_times(int user);
  263. extern void scheduler_tick(void);
  264. extern void sched_show_task(struct task_struct *p);
  265. #ifdef CONFIG_LOCKUP_DETECTOR
  266. extern void touch_softlockup_watchdog(void);
  267. extern void touch_softlockup_watchdog_sync(void);
  268. extern void touch_all_softlockup_watchdogs(void);
  269. extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
  270. void __user *buffer,
  271. size_t *lenp, loff_t *ppos);
  272. extern unsigned int softlockup_panic;
  273. extern int softlockup_thresh;
  274. #else
  275. static inline void touch_softlockup_watchdog(void)
  276. {
  277. }
  278. static inline void touch_softlockup_watchdog_sync(void)
  279. {
  280. }
  281. static inline void touch_all_softlockup_watchdogs(void)
  282. {
  283. }
  284. #endif
  285. #ifdef CONFIG_DETECT_HUNG_TASK
  286. extern unsigned int sysctl_hung_task_panic;
  287. extern unsigned long sysctl_hung_task_check_count;
  288. extern unsigned long sysctl_hung_task_timeout_secs;
  289. extern unsigned long sysctl_hung_task_warnings;
  290. extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
  291. void __user *buffer,
  292. size_t *lenp, loff_t *ppos);
  293. #endif
  294. /* Attach to any functions which should be ignored in wchan output. */
  295. #define __sched __attribute__((__section__(".sched.text")))
  296. /* Linker adds these: start and end of __sched functions */
  297. extern char __sched_text_start[], __sched_text_end[];
  298. /* Is this address in the __sched functions? */
  299. extern int in_sched_functions(unsigned long addr);
  300. #define MAX_SCHEDULE_TIMEOUT LONG_MAX
  301. extern signed long schedule_timeout(signed long timeout);
  302. extern signed long schedule_timeout_interruptible(signed long timeout);
  303. extern signed long schedule_timeout_killable(signed long timeout);
  304. extern signed long schedule_timeout_uninterruptible(signed long timeout);
  305. asmlinkage void schedule(void);
  306. extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner);
  307. struct nsproxy;
  308. struct user_namespace;
  309. /*
  310. * Default maximum number of active map areas, this limits the number of vmas
  311. * per mm struct. Users can overwrite this number by sysctl but there is a
  312. * problem.
  313. *
  314. * When a program's coredump is generated as ELF format, a section is created
  315. * per a vma. In ELF, the number of sections is represented in unsigned short.
  316. * This means the number of sections should be smaller than 65535 at coredump.
  317. * Because the kernel adds some informative sections to a image of program at
  318. * generating coredump, we need some margin. The number of extra sections is
  319. * 1-3 now and depends on arch. We use "5" as safe margin, here.
  320. */
  321. #define MAPCOUNT_ELF_CORE_MARGIN (5)
  322. #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
  323. extern int sysctl_max_map_count;
  324. #include <linux/aio.h>
  325. #ifdef CONFIG_MMU
  326. extern void arch_pick_mmap_layout(struct mm_struct *mm);
  327. extern unsigned long
  328. arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
  329. unsigned long, unsigned long);
  330. extern unsigned long
  331. arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
  332. unsigned long len, unsigned long pgoff,
  333. unsigned long flags);
  334. extern void arch_unmap_area(struct mm_struct *, unsigned long);
  335. extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
  336. #else
  337. static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
  338. #endif
  339. extern void set_dumpable(struct mm_struct *mm, int value);
  340. extern int get_dumpable(struct mm_struct *mm);
  341. /* mm flags */
  342. /* dumpable bits */
  343. #define MMF_DUMPABLE 0 /* core dump is permitted */
  344. #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
  345. #define MMF_DUMPABLE_BITS 2
  346. #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
  347. /* coredump filter bits */
  348. #define MMF_DUMP_ANON_PRIVATE 2
  349. #define MMF_DUMP_ANON_SHARED 3
  350. #define MMF_DUMP_MAPPED_PRIVATE 4
  351. #define MMF_DUMP_MAPPED_SHARED 5
  352. #define MMF_DUMP_ELF_HEADERS 6
  353. #define MMF_DUMP_HUGETLB_PRIVATE 7
  354. #define MMF_DUMP_HUGETLB_SHARED 8
  355. #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
  356. #define MMF_DUMP_FILTER_BITS 7
  357. #define MMF_DUMP_FILTER_MASK \
  358. (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
  359. #define MMF_DUMP_FILTER_DEFAULT \
  360. ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
  361. (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
  362. #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
  363. # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
  364. #else
  365. # define MMF_DUMP_MASK_DEFAULT_ELF 0
  366. #endif
  367. /* leave room for more dump flags */
  368. #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
  369. #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
  370. struct sighand_struct {
  371. atomic_t count;
  372. struct k_sigaction action[_NSIG];
  373. spinlock_t siglock;
  374. wait_queue_head_t signalfd_wqh;
  375. };
  376. struct pacct_struct {
  377. int ac_flag;
  378. long ac_exitcode;
  379. unsigned long ac_mem;
  380. cputime_t ac_utime, ac_stime;
  381. unsigned long ac_minflt, ac_majflt;
  382. };
  383. struct cpu_itimer {
  384. cputime_t expires;
  385. cputime_t incr;
  386. u32 error;
  387. u32 incr_error;
  388. };
  389. /**
  390. * struct task_cputime - collected CPU time counts
  391. * @utime: time spent in user mode, in &cputime_t units
  392. * @stime: time spent in kernel mode, in &cputime_t units
  393. * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
  394. *
  395. * This structure groups together three kinds of CPU time that are
  396. * tracked for threads and thread groups. Most things considering
  397. * CPU time want to group these counts together and treat all three
  398. * of them in parallel.
  399. */
  400. struct task_cputime {
  401. cputime_t utime;
  402. cputime_t stime;
  403. unsigned long long sum_exec_runtime;
  404. };
  405. /* Alternate field names when used to cache expirations. */
  406. #define prof_exp stime
  407. #define virt_exp utime
  408. #define sched_exp sum_exec_runtime
  409. #define INIT_CPUTIME \
  410. (struct task_cputime) { \
  411. .utime = cputime_zero, \
  412. .stime = cputime_zero, \
  413. .sum_exec_runtime = 0, \
  414. }
  415. /*
  416. * Disable preemption until the scheduler is running.
  417. * Reset by start_kernel()->sched_init()->init_idle().
  418. *
  419. * We include PREEMPT_ACTIVE to avoid cond_resched() from working
  420. * before the scheduler is active -- see should_resched().
  421. */
  422. #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
  423. /**
  424. * struct thread_group_cputimer - thread group interval timer counts
  425. * @cputime: thread group interval timers.
  426. * @running: non-zero when there are timers running and
  427. * @cputime receives updates.
  428. * @lock: lock for fields in this struct.
  429. *
  430. * This structure contains the version of task_cputime, above, that is
  431. * used for thread group CPU timer calculations.
  432. */
  433. struct thread_group_cputimer {
  434. struct task_cputime cputime;
  435. int running;
  436. spinlock_t lock;
  437. };
  438. /*
  439. * NOTE! "signal_struct" does not have it's own
  440. * locking, because a shared signal_struct always
  441. * implies a shared sighand_struct, so locking
  442. * sighand_struct is always a proper superset of
  443. * the locking of signal_struct.
  444. */
  445. struct signal_struct {
  446. atomic_t sigcnt;
  447. atomic_t live;
  448. int nr_threads;
  449. wait_queue_head_t wait_chldexit; /* for wait4() */
  450. /* current thread group signal load-balancing target: */
  451. struct task_struct *curr_target;
  452. /* shared signal handling: */
  453. struct sigpending shared_pending;
  454. /* thread group exit support */
  455. int group_exit_code;
  456. /* overloaded:
  457. * - notify group_exit_task when ->count is equal to notify_count
  458. * - everyone except group_exit_task is stopped during signal delivery
  459. * of fatal signals, group_exit_task processes the signal.
  460. */
  461. int notify_count;
  462. struct task_struct *group_exit_task;
  463. /* thread group stop support, overloads group_exit_code too */
  464. int group_stop_count;
  465. unsigned int flags; /* see SIGNAL_* flags below */
  466. /* POSIX.1b Interval Timers */
  467. struct list_head posix_timers;
  468. /* ITIMER_REAL timer for the process */
  469. struct hrtimer real_timer;
  470. struct pid *leader_pid;
  471. ktime_t it_real_incr;
  472. /*
  473. * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
  474. * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
  475. * values are defined to 0 and 1 respectively
  476. */
  477. struct cpu_itimer it[2];
  478. /*
  479. * Thread group totals for process CPU timers.
  480. * See thread_group_cputimer(), et al, for details.
  481. */
  482. struct thread_group_cputimer cputimer;
  483. /* Earliest-expiration cache. */
  484. struct task_cputime cputime_expires;
  485. struct list_head cpu_timers[3];
  486. struct pid *tty_old_pgrp;
  487. /* boolean value for session group leader */
  488. int leader;
  489. struct tty_struct *tty; /* NULL if no tty */
  490. /*
  491. * Cumulative resource counters for dead threads in the group,
  492. * and for reaped dead child processes forked by this group.
  493. * Live threads maintain their own counters and add to these
  494. * in __exit_signal, except for the group leader.
  495. */
  496. cputime_t utime, stime, cutime, cstime;
  497. cputime_t gtime;
  498. cputime_t cgtime;
  499. #ifndef CONFIG_VIRT_CPU_ACCOUNTING
  500. cputime_t prev_utime, prev_stime;
  501. #endif
  502. unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
  503. unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
  504. unsigned long inblock, oublock, cinblock, coublock;
  505. unsigned long maxrss, cmaxrss;
  506. struct task_io_accounting ioac;
  507. /*
  508. * Cumulative ns of schedule CPU time fo dead threads in the
  509. * group, not including a zombie group leader, (This only differs
  510. * from jiffies_to_ns(utime + stime) if sched_clock uses something
  511. * other than jiffies.)
  512. */
  513. unsigned long long sum_sched_runtime;
  514. /*
  515. * We don't bother to synchronize most readers of this at all,
  516. * because there is no reader checking a limit that actually needs
  517. * to get both rlim_cur and rlim_max atomically, and either one
  518. * alone is a single word that can safely be read normally.
  519. * getrlimit/setrlimit use task_lock(current->group_leader) to
  520. * protect this instead of the siglock, because they really
  521. * have no need to disable irqs.
  522. */
  523. struct rlimit rlim[RLIM_NLIMITS];
  524. #ifdef CONFIG_BSD_PROCESS_ACCT
  525. struct pacct_struct pacct; /* per-process accounting information */
  526. #endif
  527. #ifdef CONFIG_TASKSTATS
  528. struct taskstats *stats;
  529. #endif
  530. #ifdef CONFIG_AUDIT
  531. unsigned audit_tty;
  532. struct tty_audit_buf *tty_audit_buf;
  533. #endif
  534. int oom_adj; /* OOM kill score adjustment (bit shift) */
  535. };
  536. /* Context switch must be unlocked if interrupts are to be enabled */
  537. #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
  538. # define __ARCH_WANT_UNLOCKED_CTXSW
  539. #endif
  540. /*
  541. * Bits in flags field of signal_struct.
  542. */
  543. #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
  544. #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
  545. #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
  546. #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
  547. /*
  548. * Pending notifications to parent.
  549. */
  550. #define SIGNAL_CLD_STOPPED 0x00000010
  551. #define SIGNAL_CLD_CONTINUED 0x00000020
  552. #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
  553. #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
  554. /* If true, all threads except ->group_exit_task have pending SIGKILL */
  555. static inline int signal_group_exit(const struct signal_struct *sig)
  556. {
  557. return (sig->flags & SIGNAL_GROUP_EXIT) ||
  558. (sig->group_exit_task != NULL);
  559. }
  560. /*
  561. * Some day this will be a full-fledged user tracking system..
  562. */
  563. struct user_struct {
  564. atomic_t __count; /* reference count */
  565. atomic_t processes; /* How many processes does this user have? */
  566. atomic_t files; /* How many open files does this user have? */
  567. atomic_t sigpending; /* How many pending signals does this user have? */
  568. #ifdef CONFIG_INOTIFY_USER
  569. atomic_t inotify_watches; /* How many inotify watches does this user have? */
  570. atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
  571. #endif
  572. #ifdef CONFIG_EPOLL
  573. atomic_t epoll_watches; /* The number of file descriptors currently watched */
  574. #endif
  575. #ifdef CONFIG_POSIX_MQUEUE
  576. /* protected by mq_lock */
  577. unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
  578. #endif
  579. unsigned long locked_shm; /* How many pages of mlocked shm ? */
  580. #ifdef CONFIG_KEYS
  581. struct key *uid_keyring; /* UID specific keyring */
  582. struct key *session_keyring; /* UID's default session keyring */
  583. #endif
  584. /* Hash table maintenance information */
  585. struct hlist_node uidhash_node;
  586. uid_t uid;
  587. struct user_namespace *user_ns;
  588. #ifdef CONFIG_PERF_EVENTS
  589. atomic_long_t locked_vm;
  590. #endif
  591. };
  592. extern int uids_sysfs_init(void);
  593. extern struct user_struct *find_user(uid_t);
  594. extern struct user_struct root_user;
  595. #define INIT_USER (&root_user)
  596. struct backing_dev_info;
  597. struct reclaim_state;
  598. #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
  599. struct sched_info {
  600. /* cumulative counters */
  601. unsigned long pcount; /* # of times run on this cpu */
  602. unsigned long long run_delay; /* time spent waiting on a runqueue */
  603. /* timestamps */
  604. unsigned long long last_arrival,/* when we last ran on a cpu */
  605. last_queued; /* when we were last queued to run */
  606. #ifdef CONFIG_SCHEDSTATS
  607. /* BKL stats */
  608. unsigned int bkl_count;
  609. #endif
  610. };
  611. #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
  612. #ifdef CONFIG_TASK_DELAY_ACCT
  613. struct task_delay_info {
  614. spinlock_t lock;
  615. unsigned int flags; /* Private per-task flags */
  616. /* For each stat XXX, add following, aligned appropriately
  617. *
  618. * struct timespec XXX_start, XXX_end;
  619. * u64 XXX_delay;
  620. * u32 XXX_count;
  621. *
  622. * Atomicity of updates to XXX_delay, XXX_count protected by
  623. * single lock above (split into XXX_lock if contention is an issue).
  624. */
  625. /*
  626. * XXX_count is incremented on every XXX operation, the delay
  627. * associated with the operation is added to XXX_delay.
  628. * XXX_delay contains the accumulated delay time in nanoseconds.
  629. */
  630. struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
  631. u64 blkio_delay; /* wait for sync block io completion */
  632. u64 swapin_delay; /* wait for swapin block io completion */
  633. u32 blkio_count; /* total count of the number of sync block */
  634. /* io operations performed */
  635. u32 swapin_count; /* total count of the number of swapin block */
  636. /* io operations performed */
  637. struct timespec freepages_start, freepages_end;
  638. u64 freepages_delay; /* wait for memory reclaim */
  639. u32 freepages_count; /* total count of memory reclaim */
  640. };
  641. #endif /* CONFIG_TASK_DELAY_ACCT */
  642. static inline int sched_info_on(void)
  643. {
  644. #ifdef CONFIG_SCHEDSTATS
  645. return 1;
  646. #elif defined(CONFIG_TASK_DELAY_ACCT)
  647. extern int delayacct_on;
  648. return delayacct_on;
  649. #else
  650. return 0;
  651. #endif
  652. }
  653. enum cpu_idle_type {
  654. CPU_IDLE,
  655. CPU_NOT_IDLE,
  656. CPU_NEWLY_IDLE,
  657. CPU_MAX_IDLE_TYPES
  658. };
  659. /*
  660. * sched-domains (multiprocessor balancing) declarations:
  661. */
  662. /*
  663. * Increase resolution of nice-level calculations:
  664. */
  665. #define SCHED_LOAD_SHIFT 10
  666. #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
  667. #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
  668. #ifdef CONFIG_SMP
  669. #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
  670. #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
  671. #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
  672. #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
  673. #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
  674. #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
  675. #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */
  676. #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
  677. #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */
  678. #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
  679. #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
  680. #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
  681. #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
  682. enum powersavings_balance_level {
  683. POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */
  684. POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package
  685. * first for long running threads
  686. */
  687. POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle
  688. * cpu package for power savings
  689. */
  690. MAX_POWERSAVINGS_BALANCE_LEVELS
  691. };
  692. extern int sched_mc_power_savings, sched_smt_power_savings;
  693. static inline int sd_balance_for_mc_power(void)
  694. {
  695. if (sched_smt_power_savings)
  696. return SD_POWERSAVINGS_BALANCE;
  697. if (!sched_mc_power_savings)
  698. return SD_PREFER_SIBLING;
  699. return 0;
  700. }
  701. static inline int sd_balance_for_package_power(void)
  702. {
  703. if (sched_mc_power_savings | sched_smt_power_savings)
  704. return SD_POWERSAVINGS_BALANCE;
  705. return SD_PREFER_SIBLING;
  706. }
  707. extern int __weak arch_sd_sibiling_asym_packing(void);
  708. /*
  709. * Optimise SD flags for power savings:
  710. * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
  711. * Keep default SD flags if sched_{smt,mc}_power_saving=0
  712. */
  713. static inline int sd_power_saving_flags(void)
  714. {
  715. if (sched_mc_power_savings | sched_smt_power_savings)
  716. return SD_BALANCE_NEWIDLE;
  717. return 0;
  718. }
  719. struct sched_group {
  720. struct sched_group *next; /* Must be a circular list */
  721. /*
  722. * CPU power of this group, SCHED_LOAD_SCALE being max power for a
  723. * single CPU.
  724. */
  725. unsigned int cpu_power, cpu_power_orig;
  726. /*
  727. * The CPUs this group covers.
  728. *
  729. * NOTE: this field is variable length. (Allocated dynamically
  730. * by attaching extra space to the end of the structure,
  731. * depending on how many CPUs the kernel has booted up with)
  732. *
  733. * It is also be embedded into static data structures at build
  734. * time. (See 'struct static_sched_group' in kernel/sched.c)
  735. */
  736. unsigned long cpumask[0];
  737. };
  738. static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
  739. {
  740. return to_cpumask(sg->cpumask);
  741. }
  742. enum sched_domain_level {
  743. SD_LV_NONE = 0,
  744. SD_LV_SIBLING,
  745. SD_LV_MC,
  746. SD_LV_CPU,
  747. SD_LV_NODE,
  748. SD_LV_ALLNODES,
  749. SD_LV_MAX
  750. };
  751. struct sched_domain_attr {
  752. int relax_domain_level;
  753. };
  754. #define SD_ATTR_INIT (struct sched_domain_attr) { \
  755. .relax_domain_level = -1, \
  756. }
  757. struct sched_domain {
  758. /* These fields must be setup */
  759. struct sched_domain *parent; /* top domain must be null terminated */
  760. struct sched_domain *child; /* bottom domain must be null terminated */
  761. struct sched_group *groups; /* the balancing groups of the domain */
  762. unsigned long min_interval; /* Minimum balance interval ms */
  763. unsigned long max_interval; /* Maximum balance interval ms */
  764. unsigned int busy_factor; /* less balancing by factor if busy */
  765. unsigned int imbalance_pct; /* No balance until over watermark */
  766. unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
  767. unsigned int busy_idx;
  768. unsigned int idle_idx;
  769. unsigned int newidle_idx;
  770. unsigned int wake_idx;
  771. unsigned int forkexec_idx;
  772. unsigned int smt_gain;
  773. int flags; /* See SD_* */
  774. enum sched_domain_level level;
  775. /* Runtime fields. */
  776. unsigned long last_balance; /* init to jiffies. units in jiffies */
  777. unsigned int balance_interval; /* initialise to 1. units in ms. */
  778. unsigned int nr_balance_failed; /* initialise to 0 */
  779. u64 last_update;
  780. #ifdef CONFIG_SCHEDSTATS
  781. /* load_balance() stats */
  782. unsigned int lb_count[CPU_MAX_IDLE_TYPES];
  783. unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
  784. unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
  785. unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
  786. unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
  787. unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
  788. unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
  789. unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
  790. /* Active load balancing */
  791. unsigned int alb_count;
  792. unsigned int alb_failed;
  793. unsigned int alb_pushed;
  794. /* SD_BALANCE_EXEC stats */
  795. unsigned int sbe_count;
  796. unsigned int sbe_balanced;
  797. unsigned int sbe_pushed;
  798. /* SD_BALANCE_FORK stats */
  799. unsigned int sbf_count;
  800. unsigned int sbf_balanced;
  801. unsigned int sbf_pushed;
  802. /* try_to_wake_up() stats */
  803. unsigned int ttwu_wake_remote;
  804. unsigned int ttwu_move_affine;
  805. unsigned int ttwu_move_balance;
  806. #endif
  807. #ifdef CONFIG_SCHED_DEBUG
  808. char *name;
  809. #endif
  810. unsigned int span_weight;
  811. /*
  812. * Span of all CPUs in this domain.
  813. *
  814. * NOTE: this field is variable length. (Allocated dynamically
  815. * by attaching extra space to the end of the structure,
  816. * depending on how many CPUs the kernel has booted up with)
  817. *
  818. * It is also be embedded into static data structures at build
  819. * time. (See 'struct static_sched_domain' in kernel/sched.c)
  820. */
  821. unsigned long span[0];
  822. };
  823. static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
  824. {
  825. return to_cpumask(sd->span);
  826. }
  827. extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
  828. struct sched_domain_attr *dattr_new);
  829. /* Allocate an array of sched domains, for partition_sched_domains(). */
  830. cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
  831. void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
  832. /* Test a flag in parent sched domain */
  833. static inline int test_sd_parent(struct sched_domain *sd, int flag)
  834. {
  835. if (sd->parent && (sd->parent->flags & flag))
  836. return 1;
  837. return 0;
  838. }
  839. unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
  840. unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
  841. #else /* CONFIG_SMP */
  842. struct sched_domain_attr;
  843. static inline void
  844. partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
  845. struct sched_domain_attr *dattr_new)
  846. {
  847. }
  848. #endif /* !CONFIG_SMP */
  849. struct io_context; /* See blkdev.h */
  850. #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
  851. extern void prefetch_stack(struct task_struct *t);
  852. #else
  853. static inline void prefetch_stack(struct task_struct *t) { }
  854. #endif
  855. struct audit_context; /* See audit.c */
  856. struct mempolicy;
  857. struct pipe_inode_info;
  858. struct uts_namespace;
  859. struct rq;
  860. struct sched_domain;
  861. /*
  862. * wake flags
  863. */
  864. #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
  865. #define WF_FORK 0x02 /* child wakeup after fork */
  866. #define ENQUEUE_WAKEUP 1
  867. #define ENQUEUE_WAKING 2
  868. #define ENQUEUE_HEAD 4
  869. #define DEQUEUE_SLEEP 1
  870. struct sched_class {
  871. const struct sched_class *next;
  872. void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
  873. void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
  874. void (*yield_task) (struct rq *rq);
  875. void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
  876. struct task_struct * (*pick_next_task) (struct rq *rq);
  877. void (*put_prev_task) (struct rq *rq, struct task_struct *p);
  878. #ifdef CONFIG_SMP
  879. int (*select_task_rq)(struct rq *rq, struct task_struct *p,
  880. int sd_flag, int flags);
  881. void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
  882. void (*post_schedule) (struct rq *this_rq);
  883. void (*task_waking) (struct rq *this_rq, struct task_struct *task);
  884. void (*task_woken) (struct rq *this_rq, struct task_struct *task);
  885. void (*set_cpus_allowed)(struct task_struct *p,
  886. const struct cpumask *newmask);
  887. void (*rq_online)(struct rq *rq);
  888. void (*rq_offline)(struct rq *rq);
  889. #endif
  890. void (*set_curr_task) (struct rq *rq);
  891. void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
  892. void (*task_fork) (struct task_struct *p);
  893. void (*switched_from) (struct rq *this_rq, struct task_struct *task,
  894. int running);
  895. void (*switched_to) (struct rq *this_rq, struct task_struct *task,
  896. int running);
  897. void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
  898. int oldprio, int running);
  899. unsigned int (*get_rr_interval) (struct rq *rq,
  900. struct task_struct *task);
  901. #ifdef CONFIG_FAIR_GROUP_SCHED
  902. void (*moved_group) (struct task_struct *p, int on_rq);
  903. #endif
  904. };
  905. struct load_weight {
  906. unsigned long weight, inv_weight;
  907. };
  908. #ifdef CONFIG_SCHEDSTATS
  909. struct sched_statistics {
  910. u64 wait_start;
  911. u64 wait_max;
  912. u64 wait_count;
  913. u64 wait_sum;
  914. u64 iowait_count;
  915. u64 iowait_sum;
  916. u64 sleep_start;
  917. u64 sleep_max;
  918. s64 sum_sleep_runtime;
  919. u64 block_start;
  920. u64 block_max;
  921. u64 exec_max;
  922. u64 slice_max;
  923. u64 nr_migrations_cold;
  924. u64 nr_failed_migrations_affine;
  925. u64 nr_failed_migrations_running;
  926. u64 nr_failed_migrations_hot;
  927. u64 nr_forced_migrations;
  928. u64 nr_wakeups;
  929. u64 nr_wakeups_sync;
  930. u64 nr_wakeups_migrate;
  931. u64 nr_wakeups_local;
  932. u64 nr_wakeups_remote;
  933. u64 nr_wakeups_affine;
  934. u64 nr_wakeups_affine_attempts;
  935. u64 nr_wakeups_passive;
  936. u64 nr_wakeups_idle;
  937. };
  938. #endif
  939. struct sched_entity {
  940. struct load_weight load; /* for load-balancing */
  941. struct rb_node run_node;
  942. struct list_head group_node;
  943. unsigned int on_rq;
  944. u64 exec_start;
  945. u64 sum_exec_runtime;
  946. u64 vruntime;
  947. u64 prev_sum_exec_runtime;
  948. u64 nr_migrations;
  949. #ifdef CONFIG_SCHEDSTATS
  950. struct sched_statistics statistics;
  951. #endif
  952. #ifdef CONFIG_FAIR_GROUP_SCHED
  953. struct sched_entity *parent;
  954. /* rq on which this entity is (to be) queued: */
  955. struct cfs_rq *cfs_rq;
  956. /* rq "owned" by this entity/group: */
  957. struct cfs_rq *my_q;
  958. #endif
  959. };
  960. struct sched_rt_entity {
  961. struct list_head run_list;
  962. unsigned long timeout;
  963. unsigned int time_slice;
  964. int nr_cpus_allowed;
  965. struct sched_rt_entity *back;
  966. #ifdef CONFIG_RT_GROUP_SCHED
  967. struct sched_rt_entity *parent;
  968. /* rq on which this entity is (to be) queued: */
  969. struct rt_rq *rt_rq;
  970. /* rq "owned" by this entity/group: */
  971. struct rt_rq *my_q;
  972. #endif
  973. };
  974. struct rcu_node;
  975. struct task_struct {
  976. volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
  977. void *stack;
  978. atomic_t usage;
  979. unsigned int flags; /* per process flags, defined below */
  980. unsigned int ptrace;
  981. int lock_depth; /* BKL lock depth */
  982. #ifdef CONFIG_SMP
  983. #ifdef __ARCH_WANT_UNLOCKED_CTXSW
  984. int oncpu;
  985. #endif
  986. #endif
  987. int prio, static_prio, normal_prio;
  988. unsigned int rt_priority;
  989. const struct sched_class *sched_class;
  990. struct sched_entity se;
  991. struct sched_rt_entity rt;
  992. #ifdef CONFIG_PREEMPT_NOTIFIERS
  993. /* list of struct preempt_notifier: */
  994. struct hlist_head preempt_notifiers;
  995. #endif
  996. /*
  997. * fpu_counter contains the number of consecutive context switches
  998. * that the FPU is used. If this is over a threshold, the lazy fpu
  999. * saving becomes unlazy to save the trap. This is an unsigned char
  1000. * so that after 256 times the counter wraps and the behavior turns
  1001. * lazy again; this to deal with bursty apps that only use FPU for
  1002. * a short time
  1003. */
  1004. unsigned char fpu_counter;
  1005. #ifdef CONFIG_BLK_DEV_IO_TRACE
  1006. unsigned int btrace_seq;
  1007. #endif
  1008. unsigned int policy;
  1009. cpumask_t cpus_allowed;
  1010. #ifdef CONFIG_TREE_PREEMPT_RCU
  1011. int rcu_read_lock_nesting;
  1012. char rcu_read_unlock_special;
  1013. struct rcu_node *rcu_blocked_node;
  1014. struct list_head rcu_node_entry;
  1015. #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
  1016. #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
  1017. struct sched_info sched_info;
  1018. #endif
  1019. struct list_head tasks;
  1020. struct plist_node pushable_tasks;
  1021. struct mm_struct *mm, *active_mm;
  1022. #if defined(SPLIT_RSS_COUNTING)
  1023. struct task_rss_stat rss_stat;
  1024. #endif
  1025. /* task state */
  1026. int exit_state;
  1027. int exit_code, exit_signal;
  1028. int pdeath_signal; /* The signal sent when the parent dies */
  1029. /* ??? */
  1030. unsigned int personality;
  1031. unsigned did_exec:1;
  1032. unsigned in_execve:1; /* Tell the LSMs that the process is doing an
  1033. * execve */
  1034. unsigned in_iowait:1;
  1035. /* Revert to default priority/policy when forking */
  1036. unsigned sched_reset_on_fork:1;
  1037. pid_t pid;
  1038. pid_t tgid;
  1039. #ifdef CONFIG_CC_STACKPROTECTOR
  1040. /* Canary value for the -fstack-protector gcc feature */
  1041. unsigned long stack_canary;
  1042. #endif
  1043. /*
  1044. * pointers to (original) parent process, youngest child, younger sibling,
  1045. * older sibling, respectively. (p->father can be replaced with
  1046. * p->real_parent->pid)
  1047. */
  1048. struct task_struct *real_parent; /* real parent process */
  1049. struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
  1050. /*
  1051. * children/sibling forms the list of my natural children
  1052. */
  1053. struct list_head children; /* list of my children */
  1054. struct list_head sibling; /* linkage in my parent's children list */
  1055. struct task_struct *group_leader; /* threadgroup leader */
  1056. /*
  1057. * ptraced is the list of tasks this task is using ptrace on.
  1058. * This includes both natural children and PTRACE_ATTACH targets.
  1059. * p->ptrace_entry is p's link on the p->parent->ptraced list.
  1060. */
  1061. struct list_head ptraced;
  1062. struct list_head ptrace_entry;
  1063. /* PID/PID hash table linkage. */
  1064. struct pid_link pids[PIDTYPE_MAX];
  1065. struct list_head thread_group;
  1066. struct completion *vfork_done; /* for vfork() */
  1067. int __user *set_child_tid; /* CLONE_CHILD_SETTID */
  1068. int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
  1069. cputime_t utime, stime, utimescaled, stimescaled;
  1070. cputime_t gtime;
  1071. #ifndef CONFIG_VIRT_CPU_ACCOUNTING
  1072. cputime_t prev_utime, prev_stime;
  1073. #endif
  1074. unsigned long nvcsw, nivcsw; /* context switch counts */
  1075. struct timespec start_time; /* monotonic time */
  1076. struct timespec real_start_time; /* boot based time */
  1077. /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
  1078. unsigned long min_flt, maj_flt;
  1079. struct task_cputime cputime_expires;
  1080. struct list_head cpu_timers[3];
  1081. /* process credentials */
  1082. const struct cred *real_cred; /* objective and real subjective task
  1083. * credentials (COW) */
  1084. const struct cred *cred; /* effective (overridable) subjective task
  1085. * credentials (COW) */
  1086. struct mutex cred_guard_mutex; /* guard against foreign influences on
  1087. * credential calculations
  1088. * (notably. ptrace) */
  1089. struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
  1090. char comm[TASK_COMM_LEN]; /* executable name excluding path
  1091. - access with [gs]et_task_comm (which lock
  1092. it with task_lock())
  1093. - initialized normally by setup_new_exec */
  1094. /* file system info */
  1095. int link_count, total_link_count;
  1096. #ifdef CONFIG_SYSVIPC
  1097. /* ipc stuff */
  1098. struct sysv_sem sysvsem;
  1099. #endif
  1100. #ifdef CONFIG_DETECT_HUNG_TASK
  1101. /* hung task detection */
  1102. unsigned long last_switch_count;
  1103. #endif
  1104. /* CPU-specific state of this task */
  1105. struct thread_struct thread;
  1106. /* filesystem information */
  1107. struct fs_struct *fs;
  1108. /* open file information */
  1109. struct files_struct *files;
  1110. /* namespaces */
  1111. struct nsproxy *nsproxy;
  1112. /* signal handlers */
  1113. struct signal_struct *signal;
  1114. struct sighand_struct *sighand;
  1115. sigset_t blocked, real_blocked;
  1116. sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
  1117. struct sigpending pending;
  1118. unsigned long sas_ss_sp;
  1119. size_t sas_ss_size;
  1120. int (*notifier)(void *priv);
  1121. void *notifier_data;
  1122. sigset_t *notifier_mask;
  1123. struct audit_context *audit_context;
  1124. #ifdef CONFIG_AUDITSYSCALL
  1125. uid_t loginuid;
  1126. unsigned int sessionid;
  1127. #endif
  1128. seccomp_t seccomp;
  1129. /* Thread group tracking */
  1130. u32 parent_exec_id;
  1131. u32 self_exec_id;
  1132. /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
  1133. * mempolicy */
  1134. spinlock_t alloc_lock;
  1135. #ifdef CONFIG_GENERIC_HARDIRQS
  1136. /* IRQ handler threads */
  1137. struct irqaction *irqaction;
  1138. #endif
  1139. /* Protection of the PI data structures: */
  1140. raw_spinlock_t pi_lock;
  1141. #ifdef CONFIG_RT_MUTEXES
  1142. /* PI waiters blocked on a rt_mutex held by this task */
  1143. struct plist_head pi_waiters;
  1144. /* Deadlock detection and priority inheritance handling */
  1145. struct rt_mutex_waiter *pi_blocked_on;
  1146. #endif
  1147. #ifdef CONFIG_DEBUG_MUTEXES
  1148. /* mutex deadlock detection */
  1149. struct mutex_waiter *blocked_on;
  1150. #endif
  1151. #ifdef CONFIG_TRACE_IRQFLAGS
  1152. unsigned int irq_events;
  1153. unsigned long hardirq_enable_ip;
  1154. unsigned long hardirq_disable_ip;
  1155. unsigned int hardirq_enable_event;
  1156. unsigned int hardirq_disable_event;
  1157. int hardirqs_enabled;
  1158. int hardirq_context;
  1159. unsigned long softirq_disable_ip;
  1160. unsigned long softirq_enable_ip;
  1161. unsigned int softirq_disable_event;
  1162. unsigned int softirq_enable_event;
  1163. int softirqs_enabled;
  1164. int softirq_context;
  1165. #endif
  1166. #ifdef CONFIG_LOCKDEP
  1167. # define MAX_LOCK_DEPTH 48UL
  1168. u64 curr_chain_key;
  1169. int lockdep_depth;
  1170. unsigned int lockdep_recursion;
  1171. struct held_lock held_locks[MAX_LOCK_DEPTH];
  1172. gfp_t lockdep_reclaim_gfp;
  1173. #endif
  1174. /* journalling filesystem info */
  1175. void *journal_info;
  1176. /* stacked block device info */
  1177. struct bio_list *bio_list;
  1178. /* VM state */
  1179. struct reclaim_state *reclaim_state;
  1180. struct backing_dev_info *backing_dev_info;
  1181. struct io_context *io_context;
  1182. unsigned long ptrace_message;
  1183. siginfo_t *last_siginfo; /* For ptrace use. */
  1184. struct task_io_accounting ioac;
  1185. #if defined(CONFIG_TASK_XACCT)
  1186. u64 acct_rss_mem1; /* accumulated rss usage */
  1187. u64 acct_vm_mem1; /* accumulated virtual memory usage */
  1188. cputime_t acct_timexpd; /* stime + utime since last update */
  1189. #endif
  1190. #ifdef CONFIG_CPUSETS
  1191. nodemask_t mems_allowed; /* Protected by alloc_lock */
  1192. int mems_allowed_change_disable;
  1193. int cpuset_mem_spread_rotor;
  1194. int cpuset_slab_spread_rotor;
  1195. #endif
  1196. #ifdef CONFIG_CGROUPS
  1197. /* Control Group info protected by css_set_lock */
  1198. struct css_set *cgroups;
  1199. /* cg_list protected by css_set_lock and tsk->alloc_lock */
  1200. struct list_head cg_list;
  1201. #endif
  1202. #ifdef CONFIG_FUTEX
  1203. struct robust_list_head __user *robust_list;
  1204. #ifdef CONFIG_COMPAT
  1205. struct compat_robust_list_head __user *compat_robust_list;
  1206. #endif
  1207. struct list_head pi_state_list;
  1208. struct futex_pi_state *pi_state_cache;
  1209. #endif
  1210. #ifdef CONFIG_PERF_EVENTS
  1211. struct perf_event_context *perf_event_ctxp;
  1212. struct mutex perf_event_mutex;
  1213. struct list_head perf_event_list;
  1214. #endif
  1215. #ifdef CONFIG_NUMA
  1216. struct mempolicy *mempolicy; /* Protected by alloc_lock */
  1217. short il_next;
  1218. #endif
  1219. atomic_t fs_excl; /* holding fs exclusive resources */
  1220. struct rcu_head rcu;
  1221. /*
  1222. * cache last used pipe for splice
  1223. */
  1224. struct pipe_inode_info *splice_pipe;
  1225. #ifdef CONFIG_TASK_DELAY_ACCT
  1226. struct task_delay_info *delays;
  1227. #endif
  1228. #ifdef CONFIG_FAULT_INJECTION
  1229. int make_it_fail;
  1230. #endif
  1231. struct prop_local_single dirties;
  1232. #ifdef CONFIG_LATENCYTOP
  1233. int latency_record_count;
  1234. struct latency_record latency_record[LT_SAVECOUNT];
  1235. #endif
  1236. /*
  1237. * time slack values; these are used to round up poll() and
  1238. * select() etc timeout values. These are in nanoseconds.
  1239. */
  1240. unsigned long timer_slack_ns;
  1241. unsigned long default_timer_slack_ns;
  1242. struct list_head *scm_work_list;
  1243. #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  1244. /* Index of current stored address in ret_stack */
  1245. int curr_ret_stack;
  1246. /* Stack of return addresses for return function tracing */
  1247. struct ftrace_ret_stack *ret_stack;
  1248. /* time stamp for last schedule */
  1249. unsigned long long ftrace_timestamp;
  1250. /*
  1251. * Number of functions that haven't been traced
  1252. * because of depth overrun.
  1253. */
  1254. atomic_t trace_overrun;
  1255. /* Pause for the tracing */
  1256. atomic_t tracing_graph_pause;
  1257. #endif
  1258. #ifdef CONFIG_TRACING
  1259. /* state flags for use by tracers */
  1260. unsigned long trace;
  1261. /* bitmask of trace recursion */
  1262. unsigned long trace_recursion;
  1263. #endif /* CONFIG_TRACING */
  1264. #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
  1265. struct memcg_batch_info {
  1266. int do_batch; /* incremented when batch uncharge started */
  1267. struct mem_cgroup *memcg; /* target memcg of uncharge */
  1268. unsigned long bytes; /* uncharged usage */
  1269. unsigned long memsw_bytes; /* uncharged mem+swap usage */
  1270. } memcg_batch;
  1271. #endif
  1272. };
  1273. /* Future-safe accessor for struct task_struct's cpus_allowed. */
  1274. #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
  1275. /*
  1276. * Priority of a process goes from 0..MAX_PRIO-1, valid RT
  1277. * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
  1278. * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
  1279. * values are inverted: lower p->prio value means higher priority.
  1280. *
  1281. * The MAX_USER_RT_PRIO value allows the actual maximum
  1282. * RT priority to be separate from the value exported to
  1283. * user-space. This allows kernel threads to set their
  1284. * priority to a value higher than any user task. Note:
  1285. * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
  1286. */
  1287. #define MAX_USER_RT_PRIO 100
  1288. #define MAX_RT_PRIO MAX_USER_RT_PRIO
  1289. #define MAX_PRIO (MAX_RT_PRIO + 40)
  1290. #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
  1291. static inline int rt_prio(int prio)
  1292. {
  1293. if (unlikely(prio < MAX_RT_PRIO))
  1294. return 1;
  1295. return 0;
  1296. }
  1297. static inline int rt_task(struct task_struct *p)
  1298. {
  1299. return rt_prio(p->prio);
  1300. }
  1301. static inline struct pid *task_pid(struct task_struct *task)
  1302. {
  1303. return task->pids[PIDTYPE_PID].pid;
  1304. }
  1305. static inline struct pid *task_tgid(struct task_struct *task)
  1306. {
  1307. return task->group_leader->pids[PIDTYPE_PID].pid;
  1308. }
  1309. /*
  1310. * Without tasklist or rcu lock it is not safe to dereference
  1311. * the result of task_pgrp/task_session even if task == current,
  1312. * we can race with another thread doing sys_setsid/sys_setpgid.
  1313. */
  1314. static inline struct pid *task_pgrp(struct task_struct *task)
  1315. {
  1316. return task->group_leader->pids[PIDTYPE_PGID].pid;
  1317. }
  1318. static inline struct pid *task_session(struct task_struct *task)
  1319. {
  1320. return task->group_leader->pids[PIDTYPE_SID].pid;
  1321. }
  1322. struct pid_namespace;
  1323. /*
  1324. * the helpers to get the task's different pids as they are seen
  1325. * from various namespaces
  1326. *
  1327. * task_xid_nr() : global id, i.e. the id seen from the init namespace;
  1328. * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
  1329. * current.
  1330. * task_xid_nr_ns() : id seen from the ns specified;
  1331. *
  1332. * set_task_vxid() : assigns a virtual id to a task;
  1333. *
  1334. * see also pid_nr() etc in include/linux/pid.h
  1335. */
  1336. pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
  1337. struct pid_namespace *ns);
  1338. static inline pid_t task_pid_nr(struct task_struct *tsk)
  1339. {
  1340. return tsk->pid;
  1341. }
  1342. static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
  1343. struct pid_namespace *ns)
  1344. {
  1345. return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
  1346. }
  1347. static inline pid_t task_pid_vnr(struct task_struct *tsk)
  1348. {
  1349. return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
  1350. }
  1351. static inline pid_t task_tgid_nr(struct task_struct *tsk)
  1352. {
  1353. return tsk->tgid;
  1354. }
  1355. pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
  1356. static inline pid_t task_tgid_vnr(struct task_struct *tsk)
  1357. {
  1358. return pid_vnr(task_tgid(tsk));
  1359. }
  1360. static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
  1361. struct pid_namespace *ns)
  1362. {
  1363. return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
  1364. }
  1365. static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
  1366. {
  1367. return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
  1368. }
  1369. static inline pid_t task_session_nr_ns(struct task_struct *tsk,
  1370. struct pid_namespace *ns)
  1371. {
  1372. return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
  1373. }
  1374. static inline pid_t task_session_vnr(struct task_struct *tsk)
  1375. {
  1376. return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
  1377. }
  1378. /* obsolete, do not use */
  1379. static inline pid_t task_pgrp_nr(struct task_struct *tsk)
  1380. {
  1381. return task_pgrp_nr_ns(tsk, &init_pid_ns);
  1382. }
  1383. /**
  1384. * pid_alive - check that a task structure is not stale
  1385. * @p: Task structure to be checked.
  1386. *
  1387. * Test if a process is not yet dead (at most zombie state)
  1388. * If pid_alive fails, then pointers within the task structure
  1389. * can be stale and must not be dereferenced.
  1390. */
  1391. static inline int pid_alive(struct task_struct *p)
  1392. {
  1393. return p->pids[PIDTYPE_PID].pid != NULL;
  1394. }
  1395. /**
  1396. * is_global_init - check if a task structure is init
  1397. * @tsk: Task structure to be checked.
  1398. *
  1399. * Check if a task structure is the first user space task the kernel created.
  1400. */
  1401. static inline int is_global_init(struct task_struct *tsk)
  1402. {
  1403. return tsk->pid == 1;
  1404. }
  1405. /*
  1406. * is_container_init:
  1407. * check whether in the task is init in its own pid namespace.
  1408. */
  1409. extern int is_container_init(struct task_struct *tsk);
  1410. extern struct pid *cad_pid;
  1411. extern void free_task(struct task_struct *tsk);
  1412. #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
  1413. extern void __put_task_struct(struct task_struct *t);
  1414. static inline void put_task_struct(struct task_struct *t)
  1415. {
  1416. if (atomic_dec_and_test(&t->usage))
  1417. __put_task_struct(t);
  1418. }
  1419. extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
  1420. extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
  1421. /*
  1422. * Per process flags
  1423. */
  1424. #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
  1425. /* Not implemented yet, only for 486*/
  1426. #define PF_STARTING 0x00000002 /* being created */
  1427. #define PF_EXITING 0x00000004 /* getting shut down */
  1428. #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
  1429. #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
  1430. #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
  1431. #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
  1432. #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
  1433. #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
  1434. #define PF_DUMPCORE 0x00000200 /* dumped core */
  1435. #define PF_SIGNALED 0x00000400 /* killed by a signal */
  1436. #define PF_MEMALLOC 0x00000800 /* Allocating memory */
  1437. #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
  1438. #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
  1439. #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */
  1440. #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
  1441. #define PF_FROZEN 0x00010000 /* frozen for system suspend */
  1442. #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
  1443. #define PF_KSWAPD 0x00040000 /* I am kswapd */
  1444. #define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */
  1445. #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
  1446. #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
  1447. #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
  1448. #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
  1449. #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
  1450. #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
  1451. #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
  1452. #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
  1453. #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
  1454. #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
  1455. #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
  1456. #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
  1457. /*
  1458. * Only the _current_ task can read/write to tsk->flags, but other
  1459. * tasks can access tsk->flags in readonly mode for example
  1460. * with tsk_used_math (like during threaded core dumping).
  1461. * There is however an exception to this rule during ptrace
  1462. * or during fork: the ptracer task is allowed to write to the
  1463. * child->flags of its traced child (same goes for fork, the parent
  1464. * can write to the child->flags), because we're guaranteed the
  1465. * child is not running and in turn not changing child->flags
  1466. * at the same time the parent does it.
  1467. */
  1468. #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
  1469. #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
  1470. #define clear_used_math() clear_stopped_child_used_math(current)
  1471. #define set_used_math() set_stopped_child_used_math(current)
  1472. #define conditional_stopped_child_used_math(condition, child) \
  1473. do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
  1474. #define conditional_used_math(condition) \
  1475. conditional_stopped_child_used_math(condition, current)
  1476. #define copy_to_stopped_child_used_math(child) \
  1477. do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
  1478. /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
  1479. #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
  1480. #define used_math() tsk_used_math(current)
  1481. #ifdef CONFIG_TREE_PREEMPT_RCU
  1482. #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
  1483. #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
  1484. static inline void rcu_copy_process(struct task_struct *p)
  1485. {
  1486. p->rcu_read_lock_nesting = 0;
  1487. p->rcu_read_unlock_special = 0;
  1488. p->rcu_blocked_node = NULL;
  1489. INIT_LIST_HEAD(&p->rcu_node_entry);
  1490. }
  1491. #else
  1492. static inline void rcu_copy_process(struct task_struct *p)
  1493. {
  1494. }
  1495. #endif
  1496. #ifdef CONFIG_SMP
  1497. extern int set_cpus_allowed_ptr(struct task_struct *p,
  1498. const struct cpumask *new_mask);
  1499. #else
  1500. static inline int set_cpus_allowed_ptr(struct task_struct *p,
  1501. const struct cpumask *new_mask)
  1502. {
  1503. if (!cpumask_test_cpu(0, new_mask))
  1504. return -EINVAL;
  1505. return 0;
  1506. }
  1507. #endif
  1508. #ifndef CONFIG_CPUMASK_OFFSTACK
  1509. static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
  1510. {
  1511. return set_cpus_allowed_ptr(p, &new_mask);
  1512. }
  1513. #endif
  1514. /*
  1515. * Do not use outside of architecture code which knows its limitations.
  1516. *
  1517. * sched_clock() has no promise of monotonicity or bounded drift between
  1518. * CPUs, use (which you should not) requires disabling IRQs.
  1519. *
  1520. * Please use one of the three interfaces below.
  1521. */
  1522. extern unsigned long long notrace sched_clock(void);
  1523. /*
  1524. * See the comment in kernel/sched_clock.c
  1525. */
  1526. extern u64 cpu_clock(int cpu);
  1527. extern u64 local_clock(void);
  1528. extern u64 sched_clock_cpu(int cpu);
  1529. extern void sched_clock_init(void);
  1530. #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
  1531. static inline void sched_clock_tick(void)
  1532. {
  1533. }
  1534. static inline void sched_clock_idle_sleep_event(void)
  1535. {
  1536. }
  1537. static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
  1538. {
  1539. }
  1540. #else
  1541. /*
  1542. * Architectures can set this to 1 if they have specified
  1543. * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
  1544. * but then during bootup it turns out that sched_clock()
  1545. * is reliable after all:
  1546. */
  1547. extern int sched_clock_stable;
  1548. extern void sched_clock_tick(void);
  1549. extern void sched_clock_idle_sleep_event(void);
  1550. extern void sched_clock_idle_wakeup_event(u64 delta_ns);
  1551. #endif
  1552. extern unsigned long long
  1553. task_sched_runtime(struct task_struct *task);
  1554. extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
  1555. /* sched_exec is called by processes performing an exec */
  1556. #ifdef CONFIG_SMP
  1557. extern void sched_exec(void);
  1558. #else
  1559. #define sched_exec() {}
  1560. #endif
  1561. extern void sched_clock_idle_sleep_event(void);
  1562. extern void sched_clock_idle_wakeup_event(u64 delta_ns);
  1563. #ifdef CONFIG_HOTPLUG_CPU
  1564. extern void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p);
  1565. extern void idle_task_exit(void);
  1566. #else
  1567. static inline void idle_task_exit(void) {}
  1568. #endif
  1569. extern void sched_idle_next(void);
  1570. #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
  1571. extern void wake_up_idle_cpu(int cpu);
  1572. #else
  1573. static inline void wake_up_idle_cpu(int cpu) { }
  1574. #endif
  1575. extern unsigned int sysctl_sched_latency;
  1576. extern unsigned int sysctl_sched_min_granularity;
  1577. extern unsigned int sysctl_sched_wakeup_granularity;
  1578. extern unsigned int sysctl_sched_shares_ratelimit;
  1579. extern unsigned int sysctl_sched_shares_thresh;
  1580. extern unsigned int sysctl_sched_child_runs_first;
  1581. enum sched_tunable_scaling {
  1582. SCHED_TUNABLESCALING_NONE,
  1583. SCHED_TUNABLESCALING_LOG,
  1584. SCHED_TUNABLESCALING_LINEAR,
  1585. SCHED_TUNABLESCALING_END,
  1586. };
  1587. extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
  1588. #ifdef CONFIG_SCHED_DEBUG
  1589. extern unsigned int sysctl_sched_migration_cost;
  1590. extern unsigned int sysctl_sched_nr_migrate;
  1591. extern unsigned int sysctl_sched_time_avg;
  1592. extern unsigned int sysctl_timer_migration;
  1593. int sched_proc_update_handler(struct ctl_table *table, int write,
  1594. void __user *buffer, size_t *length,
  1595. loff_t *ppos);
  1596. #endif
  1597. #ifdef CONFIG_SCHED_DEBUG
  1598. static inline unsigned int get_sysctl_timer_migration(void)
  1599. {
  1600. return sysctl_timer_migration;
  1601. }
  1602. #else
  1603. static inline unsigned int get_sysctl_timer_migration(void)
  1604. {
  1605. return 1;
  1606. }
  1607. #endif
  1608. extern unsigned int sysctl_sched_rt_period;
  1609. extern int sysctl_sched_rt_runtime;
  1610. int sched_rt_handler(struct ctl_table *table, int write,
  1611. void __user *buffer, size_t *lenp,
  1612. loff_t *ppos);
  1613. extern unsigned int sysctl_sched_compat_yield;
  1614. #ifdef CONFIG_RT_MUTEXES
  1615. extern int rt_mutex_getprio(struct task_struct *p);
  1616. extern void rt_mutex_setprio(struct task_struct *p, int prio);
  1617. extern void rt_mutex_adjust_pi(struct task_struct *p);
  1618. #else
  1619. static inline int rt_mutex_getprio(struct task_struct *p)
  1620. {
  1621. return p->normal_prio;
  1622. }
  1623. # define rt_mutex_adjust_pi(p) do { } while (0)
  1624. #endif
  1625. extern void set_user_nice(struct task_struct *p, long nice);
  1626. extern int task_prio(const struct task_struct *p);
  1627. extern int task_nice(const struct task_struct *p);
  1628. extern int can_nice(const struct task_struct *p, const int nice);
  1629. extern int task_curr(const struct task_struct *p);
  1630. extern int idle_cpu(int cpu);
  1631. extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
  1632. extern int sched_setscheduler_nocheck(struct task_struct *, int,
  1633. struct sched_param *);
  1634. extern struct task_struct *idle_task(int cpu);
  1635. extern struct task_struct *curr_task(int cpu);
  1636. extern void set_curr_task(int cpu, struct task_struct *p);
  1637. void yield(void);
  1638. /*
  1639. * The default (Linux) execution domain.
  1640. */
  1641. extern struct exec_domain default_exec_domain;
  1642. union thread_union {
  1643. struct thread_info thread_info;
  1644. unsigned long stack[THREAD_SIZE/sizeof(long)];
  1645. };
  1646. #ifndef __HAVE_ARCH_KSTACK_END
  1647. static inline int kstack_end(void *addr)
  1648. {
  1649. /* Reliable end of stack detection:
  1650. * Some APM bios versions misalign the stack
  1651. */
  1652. return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
  1653. }
  1654. #endif
  1655. extern union thread_union init_thread_union;
  1656. extern struct task_struct init_task;
  1657. extern struct mm_struct init_mm;
  1658. extern struct pid_namespace init_pid_ns;
  1659. /*
  1660. * find a task by one of its numerical ids
  1661. *
  1662. * find_task_by_pid_ns():
  1663. * finds a task by its pid in the specified namespace
  1664. * find_task_by_vpid():
  1665. * finds a task by its virtual pid
  1666. *
  1667. * see also find_vpid() etc in include/linux/pid.h
  1668. */
  1669. extern struct task_struct *find_task_by_vpid(pid_t nr);
  1670. extern struct task_struct *find_task_by_pid_ns(pid_t nr,
  1671. struct pid_namespace *ns);
  1672. extern void __set_special_pids(struct pid *pid);
  1673. /* per-UID process charging. */
  1674. extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
  1675. static inline struct user_struct *get_uid(struct user_struct *u)
  1676. {
  1677. atomic_inc(&u->__count);
  1678. return u;
  1679. }
  1680. extern void free_uid(struct user_struct *);
  1681. extern void release_uids(struct user_namespace *ns);
  1682. #include <asm/current.h>
  1683. extern void do_timer(unsigned long ticks);
  1684. extern int wake_up_state(struct task_struct *tsk, unsigned int state);
  1685. extern int wake_up_process(struct task_struct *tsk);
  1686. extern void wake_up_new_task(struct task_struct *tsk,
  1687. unsigned long clone_flags);
  1688. #ifdef CONFIG_SMP
  1689. extern void kick_process(struct task_struct *tsk);
  1690. #else
  1691. static inline void kick_process(struct task_struct *tsk) { }
  1692. #endif
  1693. extern void sched_fork(struct task_struct *p, int clone_flags);
  1694. extern void sched_dead(struct task_struct *p);
  1695. extern void proc_caches_init(void);
  1696. extern void flush_signals(struct task_struct *);
  1697. extern void __flush_signals(struct task_struct *);
  1698. extern void ignore_signals(struct task_struct *);
  1699. extern void flush_signal_handlers(struct task_struct *, int force_default);
  1700. extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
  1701. static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
  1702. {
  1703. unsigned long flags;
  1704. int ret;
  1705. spin_lock_irqsave(&tsk->sighand->siglock, flags);
  1706. ret = dequeue_signal(tsk, mask, info);
  1707. spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
  1708. return ret;
  1709. }
  1710. extern void block_all_signals(int (*notifier)(void *priv), void *priv,
  1711. sigset_t *mask);
  1712. extern void unblock_all_signals(void);
  1713. extern void release_task(struct task_struct * p);
  1714. extern int send_sig_info(int, struct siginfo *, struct task_struct *);
  1715. extern int force_sigsegv(int, struct task_struct *);
  1716. extern int force_sig_info(int, struct siginfo *, struct task_struct *);
  1717. extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
  1718. extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
  1719. extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
  1720. extern int kill_pgrp(struct pid *pid, int sig, int priv);
  1721. extern int kill_pid(struct pid *pid, int sig, int priv);
  1722. extern int kill_proc_info(int, struct siginfo *, pid_t);
  1723. extern int do_notify_parent(struct task_struct *, int);
  1724. extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
  1725. extern void force_sig(int, struct task_struct *);
  1726. extern int send_sig(int, struct task_struct *, int);
  1727. extern int zap_other_threads(struct task_struct *p);
  1728. extern struct sigqueue *sigqueue_alloc(void);
  1729. extern void sigqueue_free(struct sigqueue *);
  1730. extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
  1731. extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
  1732. extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
  1733. static inline int kill_cad_pid(int sig, int priv)
  1734. {
  1735. return kill_pid(cad_pid, sig, priv);
  1736. }
  1737. /* These can be the second arg to send_sig_info/send_group_sig_info. */
  1738. #define SEND_SIG_NOINFO ((struct siginfo *) 0)
  1739. #define SEND_SIG_PRIV ((struct siginfo *) 1)
  1740. #define SEND_SIG_FORCED ((struct siginfo *) 2)
  1741. /*
  1742. * True if we are on the alternate signal stack.
  1743. */
  1744. static inline int on_sig_stack(unsigned long sp)
  1745. {
  1746. #ifdef CONFIG_STACK_GROWSUP
  1747. return sp >= current->sas_ss_sp &&
  1748. sp - current->sas_ss_sp < current->sas_ss_size;
  1749. #else
  1750. return sp > current->sas_ss_sp &&
  1751. sp - current->sas_ss_sp <= current->sas_ss_size;
  1752. #endif
  1753. }
  1754. static inline int sas_ss_flags(unsigned long sp)
  1755. {
  1756. return (current->sas_ss_size == 0 ? SS_DISABLE
  1757. : on_sig_stack(sp) ? SS_ONSTACK : 0);
  1758. }
  1759. /*
  1760. * Routines for handling mm_structs
  1761. */
  1762. extern struct mm_struct * mm_alloc(void);
  1763. /* mmdrop drops the mm and the page tables */
  1764. extern void __mmdrop(struct mm_struct *);
  1765. static inline void mmdrop(struct mm_struct * mm)
  1766. {
  1767. if (unlikely(atomic_dec_and_test(&mm->mm_count)))
  1768. __mmdrop(mm);
  1769. }
  1770. /* mmput gets rid of the mappings and all user-space */
  1771. extern void mmput(struct mm_struct *);
  1772. /* Grab a reference to a task's mm, if it is not already going away */
  1773. extern struct mm_struct *get_task_mm(struct task_struct *task);
  1774. /* Remove the current tasks stale references to the old mm_struct */
  1775. extern void mm_release(struct task_struct *, struct mm_struct *);
  1776. /* Allocate a new mm structure and copy contents from tsk->mm */
  1777. extern struct mm_struct *dup_mm(struct task_struct *tsk);
  1778. extern int copy_thread(unsigned long, unsigned long, unsigned long,
  1779. struct task_struct *, struct pt_regs *);
  1780. extern void flush_thread(void);
  1781. extern void exit_thread(void);
  1782. extern void exit_files(struct task_struct *);
  1783. extern void __cleanup_sighand(struct sighand_struct *);
  1784. extern void exit_itimers(struct signal_struct *);
  1785. extern void flush_itimer_signals(void);
  1786. extern NORET_TYPE void do_group_exit(int);
  1787. extern void daemonize(const char *, ...);
  1788. extern int allow_signal(int);
  1789. extern int disallow_signal(int);
  1790. extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
  1791. extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
  1792. struct task_struct *fork_idle(int);
  1793. extern void set_task_comm(struct task_struct *tsk, char *from);
  1794. extern char *get_task_comm(char *to, struct task_struct *tsk);
  1795. #ifdef CONFIG_SMP
  1796. extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
  1797. #else
  1798. static inline unsigned long wait_task_inactive(struct task_struct *p,
  1799. long match_state)
  1800. {
  1801. return 1;
  1802. }
  1803. #endif
  1804. #define next_task(p) \
  1805. list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
  1806. #define for_each_process(p) \
  1807. for (p = &init_task ; (p = next_task(p)) != &init_task ; )
  1808. extern bool current_is_single_threaded(void);
  1809. /*
  1810. * Careful: do_each_thread/while_each_thread is a double loop so
  1811. * 'break' will not work as expected - use goto instead.
  1812. */
  1813. #define do_each_thread(g, t) \
  1814. for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
  1815. #define while_each_thread(g, t) \
  1816. while ((t = next_thread(t)) != g)
  1817. static inline int get_nr_threads(struct task_struct *tsk)
  1818. {
  1819. return tsk->signal->nr_threads;
  1820. }
  1821. /* de_thread depends on thread_group_leader not being a pid based check */
  1822. #define thread_group_leader(p) (p == p->group_leader)
  1823. /* Do to the insanities of de_thread it is possible for a process
  1824. * to have the pid of the thread group leader without actually being
  1825. * the thread group leader. For iteration through the pids in proc
  1826. * all we care about is that we have a task with the appropriate
  1827. * pid, we don't actually care if we have the right task.
  1828. */
  1829. static inline int has_group_leader_pid(struct task_struct *p)
  1830. {
  1831. return p->pid == p->tgid;
  1832. }
  1833. static inline
  1834. int same_thread_group(struct task_struct *p1, struct task_struct *p2)
  1835. {
  1836. return p1->tgid == p2->tgid;
  1837. }
  1838. static inline struct task_struct *next_thread(const struct task_struct *p)
  1839. {
  1840. return list_entry_rcu(p->thread_group.next,
  1841. struct task_struct, thread_group);
  1842. }
  1843. static inline int thread_group_empty(struct task_struct *p)
  1844. {
  1845. return list_empty(&p->thread_group);
  1846. }
  1847. #define delay_group_leader(p) \
  1848. (thread_group_leader(p) && !thread_group_empty(p))
  1849. static inline int task_detached(struct task_struct *p)
  1850. {
  1851. return p->exit_signal == -1;
  1852. }
  1853. /*
  1854. * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
  1855. * subscriptions and synchronises with wait4(). Also used in procfs. Also
  1856. * pins the final release of task.io_context. Also protects ->cpuset and
  1857. * ->cgroup.subsys[].
  1858. *
  1859. * Nests both inside and outside of read_lock(&tasklist_lock).
  1860. * It must not be nested with write_lock_irq(&tasklist_lock),
  1861. * neither inside nor outside.
  1862. */
  1863. static inline void task_lock(struct task_struct *p)
  1864. {
  1865. spin_lock(&p->alloc_lock);
  1866. }
  1867. static inline void task_unlock(struct task_struct *p)
  1868. {
  1869. spin_unlock(&p->alloc_lock);
  1870. }
  1871. extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
  1872. unsigned long *flags);
  1873. static inline void unlock_task_sighand(struct task_struct *tsk,
  1874. unsigned long *flags)
  1875. {
  1876. spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
  1877. }
  1878. #ifndef __HAVE_THREAD_FUNCTIONS
  1879. #define task_thread_info(task) ((struct thread_info *)(task)->stack)
  1880. #define task_stack_page(task) ((task)->stack)
  1881. static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
  1882. {
  1883. *task_thread_info(p) = *task_thread_info(org);
  1884. task_thread_info(p)->task = p;
  1885. }
  1886. static inline unsigned long *end_of_stack(struct task_struct *p)
  1887. {
  1888. return (unsigned long *)(task_thread_info(p) + 1);
  1889. }
  1890. #endif
  1891. static inline int object_is_on_stack(void *obj)
  1892. {
  1893. void *stack = task_stack_page(current);
  1894. return (obj >= stack) && (obj < (stack + THREAD_SIZE));
  1895. }
  1896. extern void thread_info_cache_init(void);
  1897. #ifdef CONFIG_DEBUG_STACK_USAGE
  1898. static inline unsigned long stack_not_used(struct task_struct *p)
  1899. {
  1900. unsigned long *n = end_of_stack(p);
  1901. do { /* Skip over canary */
  1902. n++;
  1903. } while (!*n);
  1904. return (unsigned long)n - (unsigned long)end_of_stack(p);
  1905. }
  1906. #endif
  1907. /* set thread flags in other task's structures
  1908. * - see asm/thread_info.h for TIF_xxxx flags available
  1909. */
  1910. static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
  1911. {
  1912. set_ti_thread_flag(task_thread_info(tsk), flag);
  1913. }
  1914. static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
  1915. {
  1916. clear_ti_thread_flag(task_thread_info(tsk), flag);
  1917. }
  1918. static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
  1919. {
  1920. return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
  1921. }
  1922. static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
  1923. {
  1924. return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
  1925. }
  1926. static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
  1927. {
  1928. return test_ti_thread_flag(task_thread_info(tsk), flag);
  1929. }
  1930. static inline void set_tsk_need_resched(struct task_struct *tsk)
  1931. {
  1932. set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
  1933. }
  1934. static inline void clear_tsk_need_resched(struct task_struct *tsk)
  1935. {
  1936. clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
  1937. }
  1938. static inline int test_tsk_need_resched(struct task_struct *tsk)
  1939. {
  1940. return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
  1941. }
  1942. static inline int restart_syscall(void)
  1943. {
  1944. set_tsk_thread_flag(current, TIF_SIGPENDING);
  1945. return -ERESTARTNOINTR;
  1946. }
  1947. static inline int signal_pending(struct task_struct *p)
  1948. {
  1949. return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
  1950. }
  1951. static inline int __fatal_signal_pending(struct task_struct *p)
  1952. {
  1953. return unlikely(sigismember(&p->pending.signal, SIGKILL));
  1954. }
  1955. static inline int fatal_signal_pending(struct task_struct *p)
  1956. {
  1957. return signal_pending(p) && __fatal_signal_pending(p);
  1958. }
  1959. static inline int signal_pending_state(long state, struct task_struct *p)
  1960. {
  1961. if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
  1962. return 0;
  1963. if (!signal_pending(p))
  1964. return 0;
  1965. return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
  1966. }
  1967. static inline int need_resched(void)
  1968. {
  1969. return unlikely(test_thread_flag(TIF_NEED_RESCHED));
  1970. }
  1971. /*
  1972. * cond_resched() and cond_resched_lock(): latency reduction via
  1973. * explicit rescheduling in places that are safe. The return
  1974. * value indicates whether a reschedule was done in fact.
  1975. * cond_resched_lock() will drop the spinlock before scheduling,
  1976. * cond_resched_softirq() will enable bhs before scheduling.
  1977. */
  1978. extern int _cond_resched(void);
  1979. #define cond_resched() ({ \
  1980. __might_sleep(__FILE__, __LINE__, 0); \
  1981. _cond_resched(); \
  1982. })
  1983. extern int __cond_resched_lock(spinlock_t *lock);
  1984. #ifdef CONFIG_PREEMPT
  1985. #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
  1986. #else
  1987. #define PREEMPT_LOCK_OFFSET 0
  1988. #endif
  1989. #define cond_resched_lock(lock) ({ \
  1990. __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
  1991. __cond_resched_lock(lock); \
  1992. })
  1993. extern int __cond_resched_softirq(void);
  1994. #define cond_resched_softirq() ({ \
  1995. __might_sleep(__FILE__, __LINE__, SOFTIRQ_OFFSET); \
  1996. __cond_resched_softirq(); \
  1997. })
  1998. /*
  1999. * Does a critical section need to be broken due to another
  2000. * task waiting?: (technically does not depend on CONFIG_PREEMPT,
  2001. * but a general need for low latency)
  2002. */
  2003. static inline int spin_needbreak(spinlock_t *lock)
  2004. {
  2005. #ifdef CONFIG_PREEMPT
  2006. return spin_is_contended(lock);
  2007. #else
  2008. return 0;
  2009. #endif
  2010. }
  2011. /*
  2012. * Thread group CPU time accounting.
  2013. */
  2014. void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
  2015. void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
  2016. static inline void thread_group_cputime_init(struct signal_struct *sig)
  2017. {
  2018. spin_lock_init(&sig->cputimer.lock);
  2019. }
  2020. /*
  2021. * Reevaluate whether the task has signals pending delivery.
  2022. * Wake the task if so.
  2023. * This is required every time the blocked sigset_t changes.
  2024. * callers must hold sighand->siglock.
  2025. */
  2026. extern void recalc_sigpending_and_wake(struct task_struct *t);
  2027. extern void recalc_sigpending(void);
  2028. extern void signal_wake_up(struct task_struct *t, int resume_stopped);
  2029. /*
  2030. * Wrappers for p->thread_info->cpu access. No-op on UP.
  2031. */
  2032. #ifdef CONFIG_SMP
  2033. static inline unsigned int task_cpu(const struct task_struct *p)
  2034. {
  2035. return task_thread_info(p)->cpu;
  2036. }
  2037. extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
  2038. #else
  2039. static inline unsigned int task_cpu(const struct task_struct *p)
  2040. {
  2041. return 0;
  2042. }
  2043. static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
  2044. {
  2045. }
  2046. #endif /* CONFIG_SMP */
  2047. extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
  2048. extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
  2049. extern void normalize_rt_tasks(void);
  2050. #ifdef CONFIG_CGROUP_SCHED
  2051. extern struct task_group init_task_group;
  2052. extern struct task_group *sched_create_group(struct task_group *parent);
  2053. extern void sched_destroy_group(struct task_group *tg);
  2054. extern void sched_move_task(struct task_struct *tsk);
  2055. #ifdef CONFIG_FAIR_GROUP_SCHED
  2056. extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
  2057. extern unsigned long sched_group_shares(struct task_group *tg);
  2058. #endif
  2059. #ifdef CONFIG_RT_GROUP_SCHED
  2060. extern int sched_group_set_rt_runtime(struct task_group *tg,
  2061. long rt_runtime_us);
  2062. extern long sched_group_rt_runtime(struct task_group *tg);
  2063. extern int sched_group_set_rt_period(struct task_group *tg,
  2064. long rt_period_us);
  2065. extern long sched_group_rt_period(struct task_group *tg);
  2066. extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
  2067. #endif
  2068. #endif
  2069. extern int task_can_switch_user(struct user_struct *up,
  2070. struct task_struct *tsk);
  2071. #ifdef CONFIG_TASK_XACCT
  2072. static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
  2073. {
  2074. tsk->ioac.rchar += amt;
  2075. }
  2076. static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
  2077. {
  2078. tsk->ioac.wchar += amt;
  2079. }
  2080. static inline void inc_syscr(struct task_struct *tsk)
  2081. {
  2082. tsk->ioac.syscr++;
  2083. }
  2084. static inline void inc_syscw(struct task_struct *tsk)
  2085. {
  2086. tsk->ioac.syscw++;
  2087. }
  2088. #else
  2089. static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
  2090. {
  2091. }
  2092. static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
  2093. {
  2094. }
  2095. static inline void inc_syscr(struct task_struct *tsk)
  2096. {
  2097. }
  2098. static inline void inc_syscw(struct task_struct *tsk)
  2099. {
  2100. }
  2101. #endif
  2102. #ifndef TASK_SIZE_OF
  2103. #define TASK_SIZE_OF(tsk) TASK_SIZE
  2104. #endif
  2105. /*
  2106. * Call the function if the target task is executing on a CPU right now:
  2107. */
  2108. extern void task_oncpu_function_call(struct task_struct *p,
  2109. void (*func) (void *info), void *info);
  2110. #ifdef CONFIG_MM_OWNER
  2111. extern void mm_update_next_owner(struct mm_struct *mm);
  2112. extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
  2113. #else
  2114. static inline void mm_update_next_owner(struct mm_struct *mm)
  2115. {
  2116. }
  2117. static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
  2118. {
  2119. }
  2120. #endif /* CONFIG_MM_OWNER */
  2121. static inline unsigned long task_rlimit(const struct task_struct *tsk,
  2122. unsigned int limit)
  2123. {
  2124. return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
  2125. }
  2126. static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
  2127. unsigned int limit)
  2128. {
  2129. return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
  2130. }
  2131. static inline unsigned long rlimit(unsigned int limit)
  2132. {
  2133. return task_rlimit(current, limit);
  2134. }
  2135. static inline unsigned long rlimit_max(unsigned int limit)
  2136. {
  2137. return task_rlimit_max(current, limit);
  2138. }
  2139. #endif /* __KERNEL__ */
  2140. #endif