sched.h 83 KB

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  1. #ifndef _LINUX_SCHED_H
  2. #define _LINUX_SCHED_H
  3. #include <uapi/linux/sched.h>
  4. struct sched_param {
  5. int sched_priority;
  6. };
  7. #include <asm/param.h> /* for HZ */
  8. #include <linux/capability.h>
  9. #include <linux/threads.h>
  10. #include <linux/kernel.h>
  11. #include <linux/types.h>
  12. #include <linux/timex.h>
  13. #include <linux/jiffies.h>
  14. #include <linux/rbtree.h>
  15. #include <linux/thread_info.h>
  16. #include <linux/cpumask.h>
  17. #include <linux/errno.h>
  18. #include <linux/nodemask.h>
  19. #include <linux/mm_types.h>
  20. #include <asm/page.h>
  21. #include <asm/ptrace.h>
  22. #include <asm/cputime.h>
  23. #include <linux/smp.h>
  24. #include <linux/sem.h>
  25. #include <linux/signal.h>
  26. #include <linux/compiler.h>
  27. #include <linux/completion.h>
  28. #include <linux/pid.h>
  29. #include <linux/percpu.h>
  30. #include <linux/topology.h>
  31. #include <linux/proportions.h>
  32. #include <linux/seccomp.h>
  33. #include <linux/rcupdate.h>
  34. #include <linux/rculist.h>
  35. #include <linux/rtmutex.h>
  36. #include <linux/time.h>
  37. #include <linux/param.h>
  38. #include <linux/resource.h>
  39. #include <linux/timer.h>
  40. #include <linux/hrtimer.h>
  41. #include <linux/task_io_accounting.h>
  42. #include <linux/latencytop.h>
  43. #include <linux/cred.h>
  44. #include <linux/llist.h>
  45. #include <linux/uidgid.h>
  46. #include <asm/processor.h>
  47. struct exec_domain;
  48. struct futex_pi_state;
  49. struct robust_list_head;
  50. struct bio_list;
  51. struct fs_struct;
  52. struct perf_event_context;
  53. struct blk_plug;
  54. /*
  55. * List of flags we want to share for kernel threads,
  56. * if only because they are not used by them anyway.
  57. */
  58. #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
  59. /*
  60. * These are the constant used to fake the fixed-point load-average
  61. * counting. Some notes:
  62. * - 11 bit fractions expand to 22 bits by the multiplies: this gives
  63. * a load-average precision of 10 bits integer + 11 bits fractional
  64. * - if you want to count load-averages more often, you need more
  65. * precision, or rounding will get you. With 2-second counting freq,
  66. * the EXP_n values would be 1981, 2034 and 2043 if still using only
  67. * 11 bit fractions.
  68. */
  69. extern unsigned long avenrun[]; /* Load averages */
  70. extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
  71. #define FSHIFT 11 /* nr of bits of precision */
  72. #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
  73. #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
  74. #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
  75. #define EXP_5 2014 /* 1/exp(5sec/5min) */
  76. #define EXP_15 2037 /* 1/exp(5sec/15min) */
  77. #define CALC_LOAD(load,exp,n) \
  78. load *= exp; \
  79. load += n*(FIXED_1-exp); \
  80. load >>= FSHIFT;
  81. extern unsigned long total_forks;
  82. extern int nr_threads;
  83. DECLARE_PER_CPU(unsigned long, process_counts);
  84. extern int nr_processes(void);
  85. extern unsigned long nr_running(void);
  86. extern unsigned long nr_uninterruptible(void);
  87. extern unsigned long nr_iowait(void);
  88. extern unsigned long nr_iowait_cpu(int cpu);
  89. extern unsigned long this_cpu_load(void);
  90. extern void calc_global_load(unsigned long ticks);
  91. extern void update_cpu_load_nohz(void);
  92. /* Notifier for when a task gets migrated to a new CPU */
  93. struct task_migration_notifier {
  94. struct task_struct *task;
  95. int from_cpu;
  96. int to_cpu;
  97. };
  98. extern void register_task_migration_notifier(struct notifier_block *n);
  99. extern unsigned long get_parent_ip(unsigned long addr);
  100. extern void dump_cpu_task(int cpu);
  101. struct seq_file;
  102. struct cfs_rq;
  103. struct task_group;
  104. #ifdef CONFIG_SCHED_DEBUG
  105. extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
  106. extern void proc_sched_set_task(struct task_struct *p);
  107. extern void
  108. print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
  109. #else
  110. static inline void
  111. proc_sched_show_task(struct task_struct *p, struct seq_file *m)
  112. {
  113. }
  114. static inline void proc_sched_set_task(struct task_struct *p)
  115. {
  116. }
  117. static inline void
  118. print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
  119. {
  120. }
  121. #endif
  122. /*
  123. * Task state bitmask. NOTE! These bits are also
  124. * encoded in fs/proc/array.c: get_task_state().
  125. *
  126. * We have two separate sets of flags: task->state
  127. * is about runnability, while task->exit_state are
  128. * about the task exiting. Confusing, but this way
  129. * modifying one set can't modify the other one by
  130. * mistake.
  131. */
  132. #define TASK_RUNNING 0
  133. #define TASK_INTERRUPTIBLE 1
  134. #define TASK_UNINTERRUPTIBLE 2
  135. #define __TASK_STOPPED 4
  136. #define __TASK_TRACED 8
  137. /* in tsk->exit_state */
  138. #define EXIT_ZOMBIE 16
  139. #define EXIT_DEAD 32
  140. /* in tsk->state again */
  141. #define TASK_DEAD 64
  142. #define TASK_WAKEKILL 128
  143. #define TASK_WAKING 256
  144. #define TASK_STATE_MAX 512
  145. #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
  146. extern char ___assert_task_state[1 - 2*!!(
  147. sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
  148. /* Convenience macros for the sake of set_task_state */
  149. #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
  150. #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
  151. #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
  152. /* Convenience macros for the sake of wake_up */
  153. #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
  154. #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
  155. /* get_task_state() */
  156. #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
  157. TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
  158. __TASK_TRACED)
  159. #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
  160. #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
  161. #define task_is_dead(task) ((task)->exit_state != 0)
  162. #define task_is_stopped_or_traced(task) \
  163. ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
  164. #define task_contributes_to_load(task) \
  165. ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
  166. (task->flags & PF_FROZEN) == 0)
  167. #define __set_task_state(tsk, state_value) \
  168. do { (tsk)->state = (state_value); } while (0)
  169. #define set_task_state(tsk, state_value) \
  170. set_mb((tsk)->state, (state_value))
  171. /*
  172. * set_current_state() includes a barrier so that the write of current->state
  173. * is correctly serialised wrt the caller's subsequent test of whether to
  174. * actually sleep:
  175. *
  176. * set_current_state(TASK_UNINTERRUPTIBLE);
  177. * if (do_i_need_to_sleep())
  178. * schedule();
  179. *
  180. * If the caller does not need such serialisation then use __set_current_state()
  181. */
  182. #define __set_current_state(state_value) \
  183. do { current->state = (state_value); } while (0)
  184. #define set_current_state(state_value) \
  185. set_mb(current->state, (state_value))
  186. /* Task command name length */
  187. #define TASK_COMM_LEN 16
  188. #include <linux/spinlock.h>
  189. /*
  190. * This serializes "schedule()" and also protects
  191. * the run-queue from deletions/modifications (but
  192. * _adding_ to the beginning of the run-queue has
  193. * a separate lock).
  194. */
  195. extern rwlock_t tasklist_lock;
  196. extern spinlock_t mmlist_lock;
  197. struct task_struct;
  198. #ifdef CONFIG_PROVE_RCU
  199. extern int lockdep_tasklist_lock_is_held(void);
  200. #endif /* #ifdef CONFIG_PROVE_RCU */
  201. extern void sched_init(void);
  202. extern void sched_init_smp(void);
  203. extern asmlinkage void schedule_tail(struct task_struct *prev);
  204. extern void init_idle(struct task_struct *idle, int cpu);
  205. extern void init_idle_bootup_task(struct task_struct *idle);
  206. extern int runqueue_is_locked(int cpu);
  207. #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
  208. extern void nohz_balance_enter_idle(int cpu);
  209. extern void set_cpu_sd_state_idle(void);
  210. extern int get_nohz_timer_target(void);
  211. #else
  212. static inline void nohz_balance_enter_idle(int cpu) { }
  213. static inline void set_cpu_sd_state_idle(void) { }
  214. #endif
  215. /*
  216. * Only dump TASK_* tasks. (0 for all tasks)
  217. */
  218. extern void show_state_filter(unsigned long state_filter);
  219. static inline void show_state(void)
  220. {
  221. show_state_filter(0);
  222. }
  223. extern void show_regs(struct pt_regs *);
  224. /*
  225. * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
  226. * task), SP is the stack pointer of the first frame that should be shown in the back
  227. * trace (or NULL if the entire call-chain of the task should be shown).
  228. */
  229. extern void show_stack(struct task_struct *task, unsigned long *sp);
  230. void io_schedule(void);
  231. long io_schedule_timeout(long timeout);
  232. extern void cpu_init (void);
  233. extern void trap_init(void);
  234. extern void update_process_times(int user);
  235. extern void scheduler_tick(void);
  236. extern void sched_show_task(struct task_struct *p);
  237. #ifdef CONFIG_LOCKUP_DETECTOR
  238. extern void touch_softlockup_watchdog(void);
  239. extern void touch_softlockup_watchdog_sync(void);
  240. extern void touch_all_softlockup_watchdogs(void);
  241. extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
  242. void __user *buffer,
  243. size_t *lenp, loff_t *ppos);
  244. extern unsigned int softlockup_panic;
  245. void lockup_detector_init(void);
  246. #else
  247. static inline void touch_softlockup_watchdog(void)
  248. {
  249. }
  250. static inline void touch_softlockup_watchdog_sync(void)
  251. {
  252. }
  253. static inline void touch_all_softlockup_watchdogs(void)
  254. {
  255. }
  256. static inline void lockup_detector_init(void)
  257. {
  258. }
  259. #endif
  260. #ifdef CONFIG_DETECT_HUNG_TASK
  261. extern unsigned int sysctl_hung_task_panic;
  262. extern unsigned long sysctl_hung_task_check_count;
  263. extern unsigned long sysctl_hung_task_timeout_secs;
  264. extern unsigned long sysctl_hung_task_warnings;
  265. extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
  266. void __user *buffer,
  267. size_t *lenp, loff_t *ppos);
  268. #else
  269. /* Avoid need for ifdefs elsewhere in the code */
  270. enum { sysctl_hung_task_timeout_secs = 0 };
  271. #endif
  272. /* Attach to any functions which should be ignored in wchan output. */
  273. #define __sched __attribute__((__section__(".sched.text")))
  274. /* Linker adds these: start and end of __sched functions */
  275. extern char __sched_text_start[], __sched_text_end[];
  276. /* Is this address in the __sched functions? */
  277. extern int in_sched_functions(unsigned long addr);
  278. #define MAX_SCHEDULE_TIMEOUT LONG_MAX
  279. extern signed long schedule_timeout(signed long timeout);
  280. extern signed long schedule_timeout_interruptible(signed long timeout);
  281. extern signed long schedule_timeout_killable(signed long timeout);
  282. extern signed long schedule_timeout_uninterruptible(signed long timeout);
  283. asmlinkage void schedule(void);
  284. extern void schedule_preempt_disabled(void);
  285. extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);
  286. struct nsproxy;
  287. struct user_namespace;
  288. /*
  289. * Default maximum number of active map areas, this limits the number of vmas
  290. * per mm struct. Users can overwrite this number by sysctl but there is a
  291. * problem.
  292. *
  293. * When a program's coredump is generated as ELF format, a section is created
  294. * per a vma. In ELF, the number of sections is represented in unsigned short.
  295. * This means the number of sections should be smaller than 65535 at coredump.
  296. * Because the kernel adds some informative sections to a image of program at
  297. * generating coredump, we need some margin. The number of extra sections is
  298. * 1-3 now and depends on arch. We use "5" as safe margin, here.
  299. */
  300. #define MAPCOUNT_ELF_CORE_MARGIN (5)
  301. #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
  302. extern int sysctl_max_map_count;
  303. #include <linux/aio.h>
  304. #ifdef CONFIG_MMU
  305. extern void arch_pick_mmap_layout(struct mm_struct *mm);
  306. extern unsigned long
  307. arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
  308. unsigned long, unsigned long);
  309. extern unsigned long
  310. arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
  311. unsigned long len, unsigned long pgoff,
  312. unsigned long flags);
  313. extern void arch_unmap_area(struct mm_struct *, unsigned long);
  314. extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
  315. #else
  316. static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
  317. #endif
  318. extern void set_dumpable(struct mm_struct *mm, int value);
  319. extern int get_dumpable(struct mm_struct *mm);
  320. /* get/set_dumpable() values */
  321. #define SUID_DUMPABLE_DISABLED 0
  322. #define SUID_DUMPABLE_ENABLED 1
  323. #define SUID_DUMPABLE_SAFE 2
  324. /* mm flags */
  325. /* dumpable bits */
  326. #define MMF_DUMPABLE 0 /* core dump is permitted */
  327. #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
  328. #define MMF_DUMPABLE_BITS 2
  329. #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
  330. /* coredump filter bits */
  331. #define MMF_DUMP_ANON_PRIVATE 2
  332. #define MMF_DUMP_ANON_SHARED 3
  333. #define MMF_DUMP_MAPPED_PRIVATE 4
  334. #define MMF_DUMP_MAPPED_SHARED 5
  335. #define MMF_DUMP_ELF_HEADERS 6
  336. #define MMF_DUMP_HUGETLB_PRIVATE 7
  337. #define MMF_DUMP_HUGETLB_SHARED 8
  338. #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
  339. #define MMF_DUMP_FILTER_BITS 7
  340. #define MMF_DUMP_FILTER_MASK \
  341. (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
  342. #define MMF_DUMP_FILTER_DEFAULT \
  343. ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
  344. (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
  345. #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
  346. # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
  347. #else
  348. # define MMF_DUMP_MASK_DEFAULT_ELF 0
  349. #endif
  350. /* leave room for more dump flags */
  351. #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
  352. #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
  353. #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
  354. #define MMF_HAS_UPROBES 19 /* has uprobes */
  355. #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
  356. #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
  357. struct sighand_struct {
  358. atomic_t count;
  359. struct k_sigaction action[_NSIG];
  360. spinlock_t siglock;
  361. wait_queue_head_t signalfd_wqh;
  362. };
  363. struct pacct_struct {
  364. int ac_flag;
  365. long ac_exitcode;
  366. unsigned long ac_mem;
  367. cputime_t ac_utime, ac_stime;
  368. unsigned long ac_minflt, ac_majflt;
  369. };
  370. struct cpu_itimer {
  371. cputime_t expires;
  372. cputime_t incr;
  373. u32 error;
  374. u32 incr_error;
  375. };
  376. /**
  377. * struct cputime - snaphsot of system and user cputime
  378. * @utime: time spent in user mode
  379. * @stime: time spent in system mode
  380. *
  381. * Gathers a generic snapshot of user and system time.
  382. */
  383. struct cputime {
  384. cputime_t utime;
  385. cputime_t stime;
  386. };
  387. /**
  388. * struct task_cputime - collected CPU time counts
  389. * @utime: time spent in user mode, in &cputime_t units
  390. * @stime: time spent in kernel mode, in &cputime_t units
  391. * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
  392. *
  393. * This is an extension of struct cputime that includes the total runtime
  394. * spent by the task from the scheduler point of view.
  395. *
  396. * As a result, this structure groups together three kinds of CPU time
  397. * that are tracked for threads and thread groups. Most things considering
  398. * CPU time want to group these counts together and treat all three
  399. * of them in parallel.
  400. */
  401. struct task_cputime {
  402. cputime_t utime;
  403. cputime_t stime;
  404. unsigned long long sum_exec_runtime;
  405. };
  406. /* Alternate field names when used to cache expirations. */
  407. #define prof_exp stime
  408. #define virt_exp utime
  409. #define sched_exp sum_exec_runtime
  410. #define INIT_CPUTIME \
  411. (struct task_cputime) { \
  412. .utime = 0, \
  413. .stime = 0, \
  414. .sum_exec_runtime = 0, \
  415. }
  416. /*
  417. * Disable preemption until the scheduler is running.
  418. * Reset by start_kernel()->sched_init()->init_idle().
  419. *
  420. * We include PREEMPT_ACTIVE to avoid cond_resched() from working
  421. * before the scheduler is active -- see should_resched().
  422. */
  423. #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
  424. /**
  425. * struct thread_group_cputimer - thread group interval timer counts
  426. * @cputime: thread group interval timers.
  427. * @running: non-zero when there are timers running and
  428. * @cputime receives updates.
  429. * @lock: lock for fields in this struct.
  430. *
  431. * This structure contains the version of task_cputime, above, that is
  432. * used for thread group CPU timer calculations.
  433. */
  434. struct thread_group_cputimer {
  435. struct task_cputime cputime;
  436. int running;
  437. raw_spinlock_t lock;
  438. };
  439. #include <linux/rwsem.h>
  440. struct autogroup;
  441. /*
  442. * NOTE! "signal_struct" does not have its own
  443. * locking, because a shared signal_struct always
  444. * implies a shared sighand_struct, so locking
  445. * sighand_struct is always a proper superset of
  446. * the locking of signal_struct.
  447. */
  448. struct signal_struct {
  449. atomic_t sigcnt;
  450. atomic_t live;
  451. int nr_threads;
  452. wait_queue_head_t wait_chldexit; /* for wait4() */
  453. /* current thread group signal load-balancing target: */
  454. struct task_struct *curr_target;
  455. /* shared signal handling: */
  456. struct sigpending shared_pending;
  457. /* thread group exit support */
  458. int group_exit_code;
  459. /* overloaded:
  460. * - notify group_exit_task when ->count is equal to notify_count
  461. * - everyone except group_exit_task is stopped during signal delivery
  462. * of fatal signals, group_exit_task processes the signal.
  463. */
  464. int notify_count;
  465. struct task_struct *group_exit_task;
  466. /* thread group stop support, overloads group_exit_code too */
  467. int group_stop_count;
  468. unsigned int flags; /* see SIGNAL_* flags below */
  469. /*
  470. * PR_SET_CHILD_SUBREAPER marks a process, like a service
  471. * manager, to re-parent orphan (double-forking) child processes
  472. * to this process instead of 'init'. The service manager is
  473. * able to receive SIGCHLD signals and is able to investigate
  474. * the process until it calls wait(). All children of this
  475. * process will inherit a flag if they should look for a
  476. * child_subreaper process at exit.
  477. */
  478. unsigned int is_child_subreaper:1;
  479. unsigned int has_child_subreaper:1;
  480. /* POSIX.1b Interval Timers */
  481. struct list_head posix_timers;
  482. /* ITIMER_REAL timer for the process */
  483. struct hrtimer real_timer;
  484. struct pid *leader_pid;
  485. ktime_t it_real_incr;
  486. /*
  487. * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
  488. * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
  489. * values are defined to 0 and 1 respectively
  490. */
  491. struct cpu_itimer it[2];
  492. /*
  493. * Thread group totals for process CPU timers.
  494. * See thread_group_cputimer(), et al, for details.
  495. */
  496. struct thread_group_cputimer cputimer;
  497. /* Earliest-expiration cache. */
  498. struct task_cputime cputime_expires;
  499. struct list_head cpu_timers[3];
  500. struct pid *tty_old_pgrp;
  501. /* boolean value for session group leader */
  502. int leader;
  503. struct tty_struct *tty; /* NULL if no tty */
  504. #ifdef CONFIG_SCHED_AUTOGROUP
  505. struct autogroup *autogroup;
  506. #endif
  507. /*
  508. * Cumulative resource counters for dead threads in the group,
  509. * and for reaped dead child processes forked by this group.
  510. * Live threads maintain their own counters and add to these
  511. * in __exit_signal, except for the group leader.
  512. */
  513. cputime_t utime, stime, cutime, cstime;
  514. cputime_t gtime;
  515. cputime_t cgtime;
  516. #ifndef CONFIG_VIRT_CPU_ACCOUNTING
  517. struct cputime prev_cputime;
  518. #endif
  519. unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
  520. unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
  521. unsigned long inblock, oublock, cinblock, coublock;
  522. unsigned long maxrss, cmaxrss;
  523. struct task_io_accounting ioac;
  524. /*
  525. * Cumulative ns of schedule CPU time fo dead threads in the
  526. * group, not including a zombie group leader, (This only differs
  527. * from jiffies_to_ns(utime + stime) if sched_clock uses something
  528. * other than jiffies.)
  529. */
  530. unsigned long long sum_sched_runtime;
  531. /*
  532. * We don't bother to synchronize most readers of this at all,
  533. * because there is no reader checking a limit that actually needs
  534. * to get both rlim_cur and rlim_max atomically, and either one
  535. * alone is a single word that can safely be read normally.
  536. * getrlimit/setrlimit use task_lock(current->group_leader) to
  537. * protect this instead of the siglock, because they really
  538. * have no need to disable irqs.
  539. */
  540. struct rlimit rlim[RLIM_NLIMITS];
  541. #ifdef CONFIG_BSD_PROCESS_ACCT
  542. struct pacct_struct pacct; /* per-process accounting information */
  543. #endif
  544. #ifdef CONFIG_TASKSTATS
  545. struct taskstats *stats;
  546. #endif
  547. #ifdef CONFIG_AUDIT
  548. unsigned audit_tty;
  549. struct tty_audit_buf *tty_audit_buf;
  550. #endif
  551. #ifdef CONFIG_CGROUPS
  552. /*
  553. * group_rwsem prevents new tasks from entering the threadgroup and
  554. * member tasks from exiting,a more specifically, setting of
  555. * PF_EXITING. fork and exit paths are protected with this rwsem
  556. * using threadgroup_change_begin/end(). Users which require
  557. * threadgroup to remain stable should use threadgroup_[un]lock()
  558. * which also takes care of exec path. Currently, cgroup is the
  559. * only user.
  560. */
  561. struct rw_semaphore group_rwsem;
  562. #endif
  563. oom_flags_t oom_flags;
  564. short oom_score_adj; /* OOM kill score adjustment */
  565. short oom_score_adj_min; /* OOM kill score adjustment min value.
  566. * Only settable by CAP_SYS_RESOURCE. */
  567. struct mutex cred_guard_mutex; /* guard against foreign influences on
  568. * credential calculations
  569. * (notably. ptrace) */
  570. };
  571. /*
  572. * Bits in flags field of signal_struct.
  573. */
  574. #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
  575. #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
  576. #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
  577. /*
  578. * Pending notifications to parent.
  579. */
  580. #define SIGNAL_CLD_STOPPED 0x00000010
  581. #define SIGNAL_CLD_CONTINUED 0x00000020
  582. #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
  583. #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
  584. /* If true, all threads except ->group_exit_task have pending SIGKILL */
  585. static inline int signal_group_exit(const struct signal_struct *sig)
  586. {
  587. return (sig->flags & SIGNAL_GROUP_EXIT) ||
  588. (sig->group_exit_task != NULL);
  589. }
  590. /*
  591. * Some day this will be a full-fledged user tracking system..
  592. */
  593. struct user_struct {
  594. atomic_t __count; /* reference count */
  595. atomic_t processes; /* How many processes does this user have? */
  596. atomic_t files; /* How many open files does this user have? */
  597. atomic_t sigpending; /* How many pending signals does this user have? */
  598. #ifdef CONFIG_INOTIFY_USER
  599. atomic_t inotify_watches; /* How many inotify watches does this user have? */
  600. atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
  601. #endif
  602. #ifdef CONFIG_FANOTIFY
  603. atomic_t fanotify_listeners;
  604. #endif
  605. #ifdef CONFIG_EPOLL
  606. atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
  607. #endif
  608. #ifdef CONFIG_POSIX_MQUEUE
  609. /* protected by mq_lock */
  610. unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
  611. #endif
  612. unsigned long locked_shm; /* How many pages of mlocked shm ? */
  613. #ifdef CONFIG_KEYS
  614. struct key *uid_keyring; /* UID specific keyring */
  615. struct key *session_keyring; /* UID's default session keyring */
  616. #endif
  617. /* Hash table maintenance information */
  618. struct hlist_node uidhash_node;
  619. kuid_t uid;
  620. #ifdef CONFIG_PERF_EVENTS
  621. atomic_long_t locked_vm;
  622. #endif
  623. };
  624. extern int uids_sysfs_init(void);
  625. extern struct user_struct *find_user(kuid_t);
  626. extern struct user_struct root_user;
  627. #define INIT_USER (&root_user)
  628. struct backing_dev_info;
  629. struct reclaim_state;
  630. #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
  631. struct sched_info {
  632. /* cumulative counters */
  633. unsigned long pcount; /* # of times run on this cpu */
  634. unsigned long long run_delay; /* time spent waiting on a runqueue */
  635. /* timestamps */
  636. unsigned long long last_arrival,/* when we last ran on a cpu */
  637. last_queued; /* when we were last queued to run */
  638. };
  639. #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
  640. #ifdef CONFIG_TASK_DELAY_ACCT
  641. struct task_delay_info {
  642. spinlock_t lock;
  643. unsigned int flags; /* Private per-task flags */
  644. /* For each stat XXX, add following, aligned appropriately
  645. *
  646. * struct timespec XXX_start, XXX_end;
  647. * u64 XXX_delay;
  648. * u32 XXX_count;
  649. *
  650. * Atomicity of updates to XXX_delay, XXX_count protected by
  651. * single lock above (split into XXX_lock if contention is an issue).
  652. */
  653. /*
  654. * XXX_count is incremented on every XXX operation, the delay
  655. * associated with the operation is added to XXX_delay.
  656. * XXX_delay contains the accumulated delay time in nanoseconds.
  657. */
  658. struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
  659. u64 blkio_delay; /* wait for sync block io completion */
  660. u64 swapin_delay; /* wait for swapin block io completion */
  661. u32 blkio_count; /* total count of the number of sync block */
  662. /* io operations performed */
  663. u32 swapin_count; /* total count of the number of swapin block */
  664. /* io operations performed */
  665. struct timespec freepages_start, freepages_end;
  666. u64 freepages_delay; /* wait for memory reclaim */
  667. u32 freepages_count; /* total count of memory reclaim */
  668. };
  669. #endif /* CONFIG_TASK_DELAY_ACCT */
  670. static inline int sched_info_on(void)
  671. {
  672. #ifdef CONFIG_SCHEDSTATS
  673. return 1;
  674. #elif defined(CONFIG_TASK_DELAY_ACCT)
  675. extern int delayacct_on;
  676. return delayacct_on;
  677. #else
  678. return 0;
  679. #endif
  680. }
  681. enum cpu_idle_type {
  682. CPU_IDLE,
  683. CPU_NOT_IDLE,
  684. CPU_NEWLY_IDLE,
  685. CPU_MAX_IDLE_TYPES
  686. };
  687. /*
  688. * Increase resolution of nice-level calculations for 64-bit architectures.
  689. * The extra resolution improves shares distribution and load balancing of
  690. * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
  691. * hierarchies, especially on larger systems. This is not a user-visible change
  692. * and does not change the user-interface for setting shares/weights.
  693. *
  694. * We increase resolution only if we have enough bits to allow this increased
  695. * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
  696. * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
  697. * increased costs.
  698. */
  699. #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */
  700. # define SCHED_LOAD_RESOLUTION 10
  701. # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION)
  702. # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION)
  703. #else
  704. # define SCHED_LOAD_RESOLUTION 0
  705. # define scale_load(w) (w)
  706. # define scale_load_down(w) (w)
  707. #endif
  708. #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION)
  709. #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
  710. /*
  711. * Increase resolution of cpu_power calculations
  712. */
  713. #define SCHED_POWER_SHIFT 10
  714. #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
  715. /*
  716. * sched-domains (multiprocessor balancing) declarations:
  717. */
  718. #ifdef CONFIG_SMP
  719. #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
  720. #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
  721. #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
  722. #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
  723. #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
  724. #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
  725. #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
  726. #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
  727. #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
  728. #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
  729. #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
  730. #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
  731. extern int __weak arch_sd_sibiling_asym_packing(void);
  732. struct sched_group_power {
  733. atomic_t ref;
  734. /*
  735. * CPU power of this group, SCHED_LOAD_SCALE being max power for a
  736. * single CPU.
  737. */
  738. unsigned int power, power_orig;
  739. unsigned long next_update;
  740. /*
  741. * Number of busy cpus in this group.
  742. */
  743. atomic_t nr_busy_cpus;
  744. unsigned long cpumask[0]; /* iteration mask */
  745. };
  746. struct sched_group {
  747. struct sched_group *next; /* Must be a circular list */
  748. atomic_t ref;
  749. unsigned int group_weight;
  750. struct sched_group_power *sgp;
  751. /*
  752. * The CPUs this group covers.
  753. *
  754. * NOTE: this field is variable length. (Allocated dynamically
  755. * by attaching extra space to the end of the structure,
  756. * depending on how many CPUs the kernel has booted up with)
  757. */
  758. unsigned long cpumask[0];
  759. };
  760. static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
  761. {
  762. return to_cpumask(sg->cpumask);
  763. }
  764. /*
  765. * cpumask masking which cpus in the group are allowed to iterate up the domain
  766. * tree.
  767. */
  768. static inline struct cpumask *sched_group_mask(struct sched_group *sg)
  769. {
  770. return to_cpumask(sg->sgp->cpumask);
  771. }
  772. /**
  773. * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
  774. * @group: The group whose first cpu is to be returned.
  775. */
  776. static inline unsigned int group_first_cpu(struct sched_group *group)
  777. {
  778. return cpumask_first(sched_group_cpus(group));
  779. }
  780. struct sched_domain_attr {
  781. int relax_domain_level;
  782. };
  783. #define SD_ATTR_INIT (struct sched_domain_attr) { \
  784. .relax_domain_level = -1, \
  785. }
  786. extern int sched_domain_level_max;
  787. struct sched_domain {
  788. /* These fields must be setup */
  789. struct sched_domain *parent; /* top domain must be null terminated */
  790. struct sched_domain *child; /* bottom domain must be null terminated */
  791. struct sched_group *groups; /* the balancing groups of the domain */
  792. unsigned long min_interval; /* Minimum balance interval ms */
  793. unsigned long max_interval; /* Maximum balance interval ms */
  794. unsigned int busy_factor; /* less balancing by factor if busy */
  795. unsigned int imbalance_pct; /* No balance until over watermark */
  796. unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
  797. unsigned int busy_idx;
  798. unsigned int idle_idx;
  799. unsigned int newidle_idx;
  800. unsigned int wake_idx;
  801. unsigned int forkexec_idx;
  802. unsigned int smt_gain;
  803. int flags; /* See SD_* */
  804. int level;
  805. /* Runtime fields. */
  806. unsigned long last_balance; /* init to jiffies. units in jiffies */
  807. unsigned int balance_interval; /* initialise to 1. units in ms. */
  808. unsigned int nr_balance_failed; /* initialise to 0 */
  809. u64 last_update;
  810. #ifdef CONFIG_SCHEDSTATS
  811. /* load_balance() stats */
  812. unsigned int lb_count[CPU_MAX_IDLE_TYPES];
  813. unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
  814. unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
  815. unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
  816. unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
  817. unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
  818. unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
  819. unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
  820. /* Active load balancing */
  821. unsigned int alb_count;
  822. unsigned int alb_failed;
  823. unsigned int alb_pushed;
  824. /* SD_BALANCE_EXEC stats */
  825. unsigned int sbe_count;
  826. unsigned int sbe_balanced;
  827. unsigned int sbe_pushed;
  828. /* SD_BALANCE_FORK stats */
  829. unsigned int sbf_count;
  830. unsigned int sbf_balanced;
  831. unsigned int sbf_pushed;
  832. /* try_to_wake_up() stats */
  833. unsigned int ttwu_wake_remote;
  834. unsigned int ttwu_move_affine;
  835. unsigned int ttwu_move_balance;
  836. #endif
  837. #ifdef CONFIG_SCHED_DEBUG
  838. char *name;
  839. #endif
  840. union {
  841. void *private; /* used during construction */
  842. struct rcu_head rcu; /* used during destruction */
  843. };
  844. unsigned int span_weight;
  845. /*
  846. * Span of all CPUs in this domain.
  847. *
  848. * NOTE: this field is variable length. (Allocated dynamically
  849. * by attaching extra space to the end of the structure,
  850. * depending on how many CPUs the kernel has booted up with)
  851. */
  852. unsigned long span[0];
  853. };
  854. static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
  855. {
  856. return to_cpumask(sd->span);
  857. }
  858. extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
  859. struct sched_domain_attr *dattr_new);
  860. /* Allocate an array of sched domains, for partition_sched_domains(). */
  861. cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
  862. void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
  863. /* Test a flag in parent sched domain */
  864. static inline int test_sd_parent(struct sched_domain *sd, int flag)
  865. {
  866. if (sd->parent && (sd->parent->flags & flag))
  867. return 1;
  868. return 0;
  869. }
  870. unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
  871. unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
  872. bool cpus_share_cache(int this_cpu, int that_cpu);
  873. #else /* CONFIG_SMP */
  874. struct sched_domain_attr;
  875. static inline void
  876. partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
  877. struct sched_domain_attr *dattr_new)
  878. {
  879. }
  880. static inline bool cpus_share_cache(int this_cpu, int that_cpu)
  881. {
  882. return true;
  883. }
  884. #endif /* !CONFIG_SMP */
  885. struct io_context; /* See blkdev.h */
  886. #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
  887. extern void prefetch_stack(struct task_struct *t);
  888. #else
  889. static inline void prefetch_stack(struct task_struct *t) { }
  890. #endif
  891. struct audit_context; /* See audit.c */
  892. struct mempolicy;
  893. struct pipe_inode_info;
  894. struct uts_namespace;
  895. struct rq;
  896. struct sched_domain;
  897. /*
  898. * wake flags
  899. */
  900. #define WF_SYNC 0x01 /* waker goes to sleep after wakup */
  901. #define WF_FORK 0x02 /* child wakeup after fork */
  902. #define WF_MIGRATED 0x04 /* internal use, task got migrated */
  903. #define ENQUEUE_WAKEUP 1
  904. #define ENQUEUE_HEAD 2
  905. #ifdef CONFIG_SMP
  906. #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */
  907. #else
  908. #define ENQUEUE_WAKING 0
  909. #endif
  910. #define DEQUEUE_SLEEP 1
  911. struct sched_class {
  912. const struct sched_class *next;
  913. void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
  914. void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
  915. void (*yield_task) (struct rq *rq);
  916. bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt);
  917. void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
  918. struct task_struct * (*pick_next_task) (struct rq *rq);
  919. void (*put_prev_task) (struct rq *rq, struct task_struct *p);
  920. #ifdef CONFIG_SMP
  921. int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);
  922. void (*migrate_task_rq)(struct task_struct *p, int next_cpu);
  923. void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
  924. void (*post_schedule) (struct rq *this_rq);
  925. void (*task_waking) (struct task_struct *task);
  926. void (*task_woken) (struct rq *this_rq, struct task_struct *task);
  927. void (*set_cpus_allowed)(struct task_struct *p,
  928. const struct cpumask *newmask);
  929. void (*rq_online)(struct rq *rq);
  930. void (*rq_offline)(struct rq *rq);
  931. #endif
  932. void (*set_curr_task) (struct rq *rq);
  933. void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
  934. void (*task_fork) (struct task_struct *p);
  935. void (*switched_from) (struct rq *this_rq, struct task_struct *task);
  936. void (*switched_to) (struct rq *this_rq, struct task_struct *task);
  937. void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
  938. int oldprio);
  939. unsigned int (*get_rr_interval) (struct rq *rq,
  940. struct task_struct *task);
  941. #ifdef CONFIG_FAIR_GROUP_SCHED
  942. void (*task_move_group) (struct task_struct *p, int on_rq);
  943. #endif
  944. };
  945. struct load_weight {
  946. unsigned long weight, inv_weight;
  947. };
  948. struct sched_avg {
  949. /*
  950. * These sums represent an infinite geometric series and so are bound
  951. * above by 1024/(1-y). Thus we only need a u32 to store them for for all
  952. * choices of y < 1-2^(-32)*1024.
  953. */
  954. u32 runnable_avg_sum, runnable_avg_period;
  955. u64 last_runnable_update;
  956. s64 decay_count;
  957. unsigned long load_avg_contrib;
  958. };
  959. #ifdef CONFIG_SCHEDSTATS
  960. struct sched_statistics {
  961. u64 wait_start;
  962. u64 wait_max;
  963. u64 wait_count;
  964. u64 wait_sum;
  965. u64 iowait_count;
  966. u64 iowait_sum;
  967. u64 sleep_start;
  968. u64 sleep_max;
  969. s64 sum_sleep_runtime;
  970. u64 block_start;
  971. u64 block_max;
  972. u64 exec_max;
  973. u64 slice_max;
  974. u64 nr_migrations_cold;
  975. u64 nr_failed_migrations_affine;
  976. u64 nr_failed_migrations_running;
  977. u64 nr_failed_migrations_hot;
  978. u64 nr_forced_migrations;
  979. u64 nr_wakeups;
  980. u64 nr_wakeups_sync;
  981. u64 nr_wakeups_migrate;
  982. u64 nr_wakeups_local;
  983. u64 nr_wakeups_remote;
  984. u64 nr_wakeups_affine;
  985. u64 nr_wakeups_affine_attempts;
  986. u64 nr_wakeups_passive;
  987. u64 nr_wakeups_idle;
  988. };
  989. #endif
  990. struct sched_entity {
  991. struct load_weight load; /* for load-balancing */
  992. struct rb_node run_node;
  993. struct list_head group_node;
  994. unsigned int on_rq;
  995. u64 exec_start;
  996. u64 sum_exec_runtime;
  997. u64 vruntime;
  998. u64 prev_sum_exec_runtime;
  999. u64 nr_migrations;
  1000. #ifdef CONFIG_SCHEDSTATS
  1001. struct sched_statistics statistics;
  1002. #endif
  1003. #ifdef CONFIG_FAIR_GROUP_SCHED
  1004. struct sched_entity *parent;
  1005. /* rq on which this entity is (to be) queued: */
  1006. struct cfs_rq *cfs_rq;
  1007. /* rq "owned" by this entity/group: */
  1008. struct cfs_rq *my_q;
  1009. #endif
  1010. /*
  1011. * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
  1012. * removed when useful for applications beyond shares distribution (e.g.
  1013. * load-balance).
  1014. */
  1015. #if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
  1016. /* Per-entity load-tracking */
  1017. struct sched_avg avg;
  1018. #endif
  1019. };
  1020. struct sched_rt_entity {
  1021. struct list_head run_list;
  1022. unsigned long timeout;
  1023. unsigned int time_slice;
  1024. struct sched_rt_entity *back;
  1025. #ifdef CONFIG_RT_GROUP_SCHED
  1026. struct sched_rt_entity *parent;
  1027. /* rq on which this entity is (to be) queued: */
  1028. struct rt_rq *rt_rq;
  1029. /* rq "owned" by this entity/group: */
  1030. struct rt_rq *my_q;
  1031. #endif
  1032. };
  1033. /*
  1034. * default timeslice is 100 msecs (used only for SCHED_RR tasks).
  1035. * Timeslices get refilled after they expire.
  1036. */
  1037. #define RR_TIMESLICE (100 * HZ / 1000)
  1038. struct rcu_node;
  1039. enum perf_event_task_context {
  1040. perf_invalid_context = -1,
  1041. perf_hw_context = 0,
  1042. perf_sw_context,
  1043. perf_nr_task_contexts,
  1044. };
  1045. struct task_struct {
  1046. volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
  1047. void *stack;
  1048. atomic_t usage;
  1049. unsigned int flags; /* per process flags, defined below */
  1050. unsigned int ptrace;
  1051. #ifdef CONFIG_SMP
  1052. struct llist_node wake_entry;
  1053. int on_cpu;
  1054. #endif
  1055. int on_rq;
  1056. int prio, static_prio, normal_prio;
  1057. unsigned int rt_priority;
  1058. const struct sched_class *sched_class;
  1059. struct sched_entity se;
  1060. struct sched_rt_entity rt;
  1061. #ifdef CONFIG_CGROUP_SCHED
  1062. struct task_group *sched_task_group;
  1063. #endif
  1064. #ifdef CONFIG_PREEMPT_NOTIFIERS
  1065. /* list of struct preempt_notifier: */
  1066. struct hlist_head preempt_notifiers;
  1067. #endif
  1068. /*
  1069. * fpu_counter contains the number of consecutive context switches
  1070. * that the FPU is used. If this is over a threshold, the lazy fpu
  1071. * saving becomes unlazy to save the trap. This is an unsigned char
  1072. * so that after 256 times the counter wraps and the behavior turns
  1073. * lazy again; this to deal with bursty apps that only use FPU for
  1074. * a short time
  1075. */
  1076. unsigned char fpu_counter;
  1077. #ifdef CONFIG_BLK_DEV_IO_TRACE
  1078. unsigned int btrace_seq;
  1079. #endif
  1080. unsigned int policy;
  1081. int nr_cpus_allowed;
  1082. cpumask_t cpus_allowed;
  1083. #ifdef CONFIG_PREEMPT_RCU
  1084. int rcu_read_lock_nesting;
  1085. char rcu_read_unlock_special;
  1086. struct list_head rcu_node_entry;
  1087. #endif /* #ifdef CONFIG_PREEMPT_RCU */
  1088. #ifdef CONFIG_TREE_PREEMPT_RCU
  1089. struct rcu_node *rcu_blocked_node;
  1090. #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
  1091. #ifdef CONFIG_RCU_BOOST
  1092. struct rt_mutex *rcu_boost_mutex;
  1093. #endif /* #ifdef CONFIG_RCU_BOOST */
  1094. #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
  1095. struct sched_info sched_info;
  1096. #endif
  1097. struct list_head tasks;
  1098. #ifdef CONFIG_SMP
  1099. struct plist_node pushable_tasks;
  1100. #endif
  1101. struct mm_struct *mm, *active_mm;
  1102. #ifdef CONFIG_COMPAT_BRK
  1103. unsigned brk_randomized:1;
  1104. #endif
  1105. #if defined(SPLIT_RSS_COUNTING)
  1106. struct task_rss_stat rss_stat;
  1107. #endif
  1108. /* task state */
  1109. int exit_state;
  1110. int exit_code, exit_signal;
  1111. int pdeath_signal; /* The signal sent when the parent dies */
  1112. unsigned int jobctl; /* JOBCTL_*, siglock protected */
  1113. /* ??? */
  1114. unsigned int personality;
  1115. unsigned did_exec:1;
  1116. unsigned in_execve:1; /* Tell the LSMs that the process is doing an
  1117. * execve */
  1118. unsigned in_iowait:1;
  1119. /* task may not gain privileges */
  1120. unsigned no_new_privs:1;
  1121. /* Revert to default priority/policy when forking */
  1122. unsigned sched_reset_on_fork:1;
  1123. unsigned sched_contributes_to_load:1;
  1124. pid_t pid;
  1125. pid_t tgid;
  1126. #ifdef CONFIG_CC_STACKPROTECTOR
  1127. /* Canary value for the -fstack-protector gcc feature */
  1128. unsigned long stack_canary;
  1129. #endif
  1130. /*
  1131. * pointers to (original) parent process, youngest child, younger sibling,
  1132. * older sibling, respectively. (p->father can be replaced with
  1133. * p->real_parent->pid)
  1134. */
  1135. struct task_struct __rcu *real_parent; /* real parent process */
  1136. struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
  1137. /*
  1138. * children/sibling forms the list of my natural children
  1139. */
  1140. struct list_head children; /* list of my children */
  1141. struct list_head sibling; /* linkage in my parent's children list */
  1142. struct task_struct *group_leader; /* threadgroup leader */
  1143. /*
  1144. * ptraced is the list of tasks this task is using ptrace on.
  1145. * This includes both natural children and PTRACE_ATTACH targets.
  1146. * p->ptrace_entry is p's link on the p->parent->ptraced list.
  1147. */
  1148. struct list_head ptraced;
  1149. struct list_head ptrace_entry;
  1150. /* PID/PID hash table linkage. */
  1151. struct pid_link pids[PIDTYPE_MAX];
  1152. struct list_head thread_group;
  1153. struct completion *vfork_done; /* for vfork() */
  1154. int __user *set_child_tid; /* CLONE_CHILD_SETTID */
  1155. int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
  1156. cputime_t utime, stime, utimescaled, stimescaled;
  1157. cputime_t gtime;
  1158. #ifndef CONFIG_VIRT_CPU_ACCOUNTING
  1159. struct cputime prev_cputime;
  1160. #endif
  1161. unsigned long nvcsw, nivcsw; /* context switch counts */
  1162. struct timespec start_time; /* monotonic time */
  1163. struct timespec real_start_time; /* boot based time */
  1164. /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
  1165. unsigned long min_flt, maj_flt;
  1166. struct task_cputime cputime_expires;
  1167. struct list_head cpu_timers[3];
  1168. /* process credentials */
  1169. const struct cred __rcu *real_cred; /* objective and real subjective task
  1170. * credentials (COW) */
  1171. const struct cred __rcu *cred; /* effective (overridable) subjective task
  1172. * credentials (COW) */
  1173. char comm[TASK_COMM_LEN]; /* executable name excluding path
  1174. - access with [gs]et_task_comm (which lock
  1175. it with task_lock())
  1176. - initialized normally by setup_new_exec */
  1177. /* file system info */
  1178. int link_count, total_link_count;
  1179. #ifdef CONFIG_SYSVIPC
  1180. /* ipc stuff */
  1181. struct sysv_sem sysvsem;
  1182. #endif
  1183. #ifdef CONFIG_DETECT_HUNG_TASK
  1184. /* hung task detection */
  1185. unsigned long last_switch_count;
  1186. #endif
  1187. /* CPU-specific state of this task */
  1188. struct thread_struct thread;
  1189. /* filesystem information */
  1190. struct fs_struct *fs;
  1191. /* open file information */
  1192. struct files_struct *files;
  1193. /* namespaces */
  1194. struct nsproxy *nsproxy;
  1195. /* signal handlers */
  1196. struct signal_struct *signal;
  1197. struct sighand_struct *sighand;
  1198. sigset_t blocked, real_blocked;
  1199. sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
  1200. struct sigpending pending;
  1201. unsigned long sas_ss_sp;
  1202. size_t sas_ss_size;
  1203. int (*notifier)(void *priv);
  1204. void *notifier_data;
  1205. sigset_t *notifier_mask;
  1206. struct callback_head *task_works;
  1207. struct audit_context *audit_context;
  1208. #ifdef CONFIG_AUDITSYSCALL
  1209. kuid_t loginuid;
  1210. unsigned int sessionid;
  1211. #endif
  1212. struct seccomp seccomp;
  1213. /* Thread group tracking */
  1214. u32 parent_exec_id;
  1215. u32 self_exec_id;
  1216. /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
  1217. * mempolicy */
  1218. spinlock_t alloc_lock;
  1219. /* Protection of the PI data structures: */
  1220. raw_spinlock_t pi_lock;
  1221. #ifdef CONFIG_RT_MUTEXES
  1222. /* PI waiters blocked on a rt_mutex held by this task */
  1223. struct plist_head pi_waiters;
  1224. /* Deadlock detection and priority inheritance handling */
  1225. struct rt_mutex_waiter *pi_blocked_on;
  1226. #endif
  1227. #ifdef CONFIG_DEBUG_MUTEXES
  1228. /* mutex deadlock detection */
  1229. struct mutex_waiter *blocked_on;
  1230. #endif
  1231. #ifdef CONFIG_TRACE_IRQFLAGS
  1232. unsigned int irq_events;
  1233. unsigned long hardirq_enable_ip;
  1234. unsigned long hardirq_disable_ip;
  1235. unsigned int hardirq_enable_event;
  1236. unsigned int hardirq_disable_event;
  1237. int hardirqs_enabled;
  1238. int hardirq_context;
  1239. unsigned long softirq_disable_ip;
  1240. unsigned long softirq_enable_ip;
  1241. unsigned int softirq_disable_event;
  1242. unsigned int softirq_enable_event;
  1243. int softirqs_enabled;
  1244. int softirq_context;
  1245. #endif
  1246. #ifdef CONFIG_LOCKDEP
  1247. # define MAX_LOCK_DEPTH 48UL
  1248. u64 curr_chain_key;
  1249. int lockdep_depth;
  1250. unsigned int lockdep_recursion;
  1251. struct held_lock held_locks[MAX_LOCK_DEPTH];
  1252. gfp_t lockdep_reclaim_gfp;
  1253. #endif
  1254. /* journalling filesystem info */
  1255. void *journal_info;
  1256. /* stacked block device info */
  1257. struct bio_list *bio_list;
  1258. #ifdef CONFIG_BLOCK
  1259. /* stack plugging */
  1260. struct blk_plug *plug;
  1261. #endif
  1262. /* VM state */
  1263. struct reclaim_state *reclaim_state;
  1264. struct backing_dev_info *backing_dev_info;
  1265. struct io_context *io_context;
  1266. unsigned long ptrace_message;
  1267. siginfo_t *last_siginfo; /* For ptrace use. */
  1268. struct task_io_accounting ioac;
  1269. #if defined(CONFIG_TASK_XACCT)
  1270. u64 acct_rss_mem1; /* accumulated rss usage */
  1271. u64 acct_vm_mem1; /* accumulated virtual memory usage */
  1272. cputime_t acct_timexpd; /* stime + utime since last update */
  1273. #endif
  1274. #ifdef CONFIG_CPUSETS
  1275. nodemask_t mems_allowed; /* Protected by alloc_lock */
  1276. seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
  1277. int cpuset_mem_spread_rotor;
  1278. int cpuset_slab_spread_rotor;
  1279. #endif
  1280. #ifdef CONFIG_CGROUPS
  1281. /* Control Group info protected by css_set_lock */
  1282. struct css_set __rcu *cgroups;
  1283. /* cg_list protected by css_set_lock and tsk->alloc_lock */
  1284. struct list_head cg_list;
  1285. #endif
  1286. #ifdef CONFIG_FUTEX
  1287. struct robust_list_head __user *robust_list;
  1288. #ifdef CONFIG_COMPAT
  1289. struct compat_robust_list_head __user *compat_robust_list;
  1290. #endif
  1291. struct list_head pi_state_list;
  1292. struct futex_pi_state *pi_state_cache;
  1293. #endif
  1294. #ifdef CONFIG_PERF_EVENTS
  1295. struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
  1296. struct mutex perf_event_mutex;
  1297. struct list_head perf_event_list;
  1298. #endif
  1299. #ifdef CONFIG_NUMA
  1300. struct mempolicy *mempolicy; /* Protected by alloc_lock */
  1301. short il_next;
  1302. short pref_node_fork;
  1303. #endif
  1304. #ifdef CONFIG_NUMA_BALANCING
  1305. int numa_scan_seq;
  1306. int numa_migrate_seq;
  1307. unsigned int numa_scan_period;
  1308. u64 node_stamp; /* migration stamp */
  1309. struct callback_head numa_work;
  1310. #endif /* CONFIG_NUMA_BALANCING */
  1311. struct rcu_head rcu;
  1312. /*
  1313. * cache last used pipe for splice
  1314. */
  1315. struct pipe_inode_info *splice_pipe;
  1316. struct page_frag task_frag;
  1317. #ifdef CONFIG_TASK_DELAY_ACCT
  1318. struct task_delay_info *delays;
  1319. #endif
  1320. #ifdef CONFIG_FAULT_INJECTION
  1321. int make_it_fail;
  1322. #endif
  1323. /*
  1324. * when (nr_dirtied >= nr_dirtied_pause), it's time to call
  1325. * balance_dirty_pages() for some dirty throttling pause
  1326. */
  1327. int nr_dirtied;
  1328. int nr_dirtied_pause;
  1329. unsigned long dirty_paused_when; /* start of a write-and-pause period */
  1330. #ifdef CONFIG_LATENCYTOP
  1331. int latency_record_count;
  1332. struct latency_record latency_record[LT_SAVECOUNT];
  1333. #endif
  1334. /*
  1335. * time slack values; these are used to round up poll() and
  1336. * select() etc timeout values. These are in nanoseconds.
  1337. */
  1338. unsigned long timer_slack_ns;
  1339. unsigned long default_timer_slack_ns;
  1340. #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  1341. /* Index of current stored address in ret_stack */
  1342. int curr_ret_stack;
  1343. /* Stack of return addresses for return function tracing */
  1344. struct ftrace_ret_stack *ret_stack;
  1345. /* time stamp for last schedule */
  1346. unsigned long long ftrace_timestamp;
  1347. /*
  1348. * Number of functions that haven't been traced
  1349. * because of depth overrun.
  1350. */
  1351. atomic_t trace_overrun;
  1352. /* Pause for the tracing */
  1353. atomic_t tracing_graph_pause;
  1354. #endif
  1355. #ifdef CONFIG_TRACING
  1356. /* state flags for use by tracers */
  1357. unsigned long trace;
  1358. /* bitmask and counter of trace recursion */
  1359. unsigned long trace_recursion;
  1360. #endif /* CONFIG_TRACING */
  1361. #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
  1362. struct memcg_batch_info {
  1363. int do_batch; /* incremented when batch uncharge started */
  1364. struct mem_cgroup *memcg; /* target memcg of uncharge */
  1365. unsigned long nr_pages; /* uncharged usage */
  1366. unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
  1367. } memcg_batch;
  1368. unsigned int memcg_kmem_skip_account;
  1369. #endif
  1370. #ifdef CONFIG_HAVE_HW_BREAKPOINT
  1371. atomic_t ptrace_bp_refcnt;
  1372. #endif
  1373. #ifdef CONFIG_UPROBES
  1374. struct uprobe_task *utask;
  1375. #endif
  1376. };
  1377. /* Future-safe accessor for struct task_struct's cpus_allowed. */
  1378. #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
  1379. #ifdef CONFIG_NUMA_BALANCING
  1380. extern void task_numa_fault(int node, int pages, bool migrated);
  1381. extern void set_numabalancing_state(bool enabled);
  1382. #else
  1383. static inline void task_numa_fault(int node, int pages, bool migrated)
  1384. {
  1385. }
  1386. static inline void set_numabalancing_state(bool enabled)
  1387. {
  1388. }
  1389. #endif
  1390. /*
  1391. * Priority of a process goes from 0..MAX_PRIO-1, valid RT
  1392. * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
  1393. * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
  1394. * values are inverted: lower p->prio value means higher priority.
  1395. *
  1396. * The MAX_USER_RT_PRIO value allows the actual maximum
  1397. * RT priority to be separate from the value exported to
  1398. * user-space. This allows kernel threads to set their
  1399. * priority to a value higher than any user task. Note:
  1400. * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
  1401. */
  1402. #define MAX_USER_RT_PRIO 100
  1403. #define MAX_RT_PRIO MAX_USER_RT_PRIO
  1404. #define MAX_PRIO (MAX_RT_PRIO + 40)
  1405. #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
  1406. static inline int rt_prio(int prio)
  1407. {
  1408. if (unlikely(prio < MAX_RT_PRIO))
  1409. return 1;
  1410. return 0;
  1411. }
  1412. static inline int rt_task(struct task_struct *p)
  1413. {
  1414. return rt_prio(p->prio);
  1415. }
  1416. static inline struct pid *task_pid(struct task_struct *task)
  1417. {
  1418. return task->pids[PIDTYPE_PID].pid;
  1419. }
  1420. static inline struct pid *task_tgid(struct task_struct *task)
  1421. {
  1422. return task->group_leader->pids[PIDTYPE_PID].pid;
  1423. }
  1424. /*
  1425. * Without tasklist or rcu lock it is not safe to dereference
  1426. * the result of task_pgrp/task_session even if task == current,
  1427. * we can race with another thread doing sys_setsid/sys_setpgid.
  1428. */
  1429. static inline struct pid *task_pgrp(struct task_struct *task)
  1430. {
  1431. return task->group_leader->pids[PIDTYPE_PGID].pid;
  1432. }
  1433. static inline struct pid *task_session(struct task_struct *task)
  1434. {
  1435. return task->group_leader->pids[PIDTYPE_SID].pid;
  1436. }
  1437. struct pid_namespace;
  1438. /*
  1439. * the helpers to get the task's different pids as they are seen
  1440. * from various namespaces
  1441. *
  1442. * task_xid_nr() : global id, i.e. the id seen from the init namespace;
  1443. * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
  1444. * current.
  1445. * task_xid_nr_ns() : id seen from the ns specified;
  1446. *
  1447. * set_task_vxid() : assigns a virtual id to a task;
  1448. *
  1449. * see also pid_nr() etc in include/linux/pid.h
  1450. */
  1451. pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
  1452. struct pid_namespace *ns);
  1453. static inline pid_t task_pid_nr(struct task_struct *tsk)
  1454. {
  1455. return tsk->pid;
  1456. }
  1457. static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
  1458. struct pid_namespace *ns)
  1459. {
  1460. return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
  1461. }
  1462. static inline pid_t task_pid_vnr(struct task_struct *tsk)
  1463. {
  1464. return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
  1465. }
  1466. static inline pid_t task_tgid_nr(struct task_struct *tsk)
  1467. {
  1468. return tsk->tgid;
  1469. }
  1470. pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
  1471. static inline pid_t task_tgid_vnr(struct task_struct *tsk)
  1472. {
  1473. return pid_vnr(task_tgid(tsk));
  1474. }
  1475. static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
  1476. struct pid_namespace *ns)
  1477. {
  1478. return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
  1479. }
  1480. static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
  1481. {
  1482. return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
  1483. }
  1484. static inline pid_t task_session_nr_ns(struct task_struct *tsk,
  1485. struct pid_namespace *ns)
  1486. {
  1487. return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
  1488. }
  1489. static inline pid_t task_session_vnr(struct task_struct *tsk)
  1490. {
  1491. return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
  1492. }
  1493. /* obsolete, do not use */
  1494. static inline pid_t task_pgrp_nr(struct task_struct *tsk)
  1495. {
  1496. return task_pgrp_nr_ns(tsk, &init_pid_ns);
  1497. }
  1498. /**
  1499. * pid_alive - check that a task structure is not stale
  1500. * @p: Task structure to be checked.
  1501. *
  1502. * Test if a process is not yet dead (at most zombie state)
  1503. * If pid_alive fails, then pointers within the task structure
  1504. * can be stale and must not be dereferenced.
  1505. */
  1506. static inline int pid_alive(struct task_struct *p)
  1507. {
  1508. return p->pids[PIDTYPE_PID].pid != NULL;
  1509. }
  1510. /**
  1511. * is_global_init - check if a task structure is init
  1512. * @tsk: Task structure to be checked.
  1513. *
  1514. * Check if a task structure is the first user space task the kernel created.
  1515. */
  1516. static inline int is_global_init(struct task_struct *tsk)
  1517. {
  1518. return tsk->pid == 1;
  1519. }
  1520. extern struct pid *cad_pid;
  1521. extern void free_task(struct task_struct *tsk);
  1522. #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
  1523. extern void __put_task_struct(struct task_struct *t);
  1524. static inline void put_task_struct(struct task_struct *t)
  1525. {
  1526. if (atomic_dec_and_test(&t->usage))
  1527. __put_task_struct(t);
  1528. }
  1529. extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
  1530. extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
  1531. /*
  1532. * Per process flags
  1533. */
  1534. #define PF_EXITING 0x00000004 /* getting shut down */
  1535. #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
  1536. #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
  1537. #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
  1538. #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
  1539. #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
  1540. #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
  1541. #define PF_DUMPCORE 0x00000200 /* dumped core */
  1542. #define PF_SIGNALED 0x00000400 /* killed by a signal */
  1543. #define PF_MEMALLOC 0x00000800 /* Allocating memory */
  1544. #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
  1545. #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
  1546. #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
  1547. #define PF_FROZEN 0x00010000 /* frozen for system suspend */
  1548. #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
  1549. #define PF_KSWAPD 0x00040000 /* I am kswapd */
  1550. #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
  1551. #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
  1552. #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
  1553. #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
  1554. #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
  1555. #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
  1556. #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
  1557. #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
  1558. #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
  1559. #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
  1560. #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
  1561. /*
  1562. * Only the _current_ task can read/write to tsk->flags, but other
  1563. * tasks can access tsk->flags in readonly mode for example
  1564. * with tsk_used_math (like during threaded core dumping).
  1565. * There is however an exception to this rule during ptrace
  1566. * or during fork: the ptracer task is allowed to write to the
  1567. * child->flags of its traced child (same goes for fork, the parent
  1568. * can write to the child->flags), because we're guaranteed the
  1569. * child is not running and in turn not changing child->flags
  1570. * at the same time the parent does it.
  1571. */
  1572. #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
  1573. #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
  1574. #define clear_used_math() clear_stopped_child_used_math(current)
  1575. #define set_used_math() set_stopped_child_used_math(current)
  1576. #define conditional_stopped_child_used_math(condition, child) \
  1577. do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
  1578. #define conditional_used_math(condition) \
  1579. conditional_stopped_child_used_math(condition, current)
  1580. #define copy_to_stopped_child_used_math(child) \
  1581. do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
  1582. /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
  1583. #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
  1584. #define used_math() tsk_used_math(current)
  1585. /*
  1586. * task->jobctl flags
  1587. */
  1588. #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
  1589. #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
  1590. #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
  1591. #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
  1592. #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
  1593. #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
  1594. #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
  1595. #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
  1596. #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
  1597. #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
  1598. #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
  1599. #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
  1600. #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
  1601. #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
  1602. #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
  1603. #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
  1604. #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
  1605. extern bool task_set_jobctl_pending(struct task_struct *task,
  1606. unsigned int mask);
  1607. extern void task_clear_jobctl_trapping(struct task_struct *task);
  1608. extern void task_clear_jobctl_pending(struct task_struct *task,
  1609. unsigned int mask);
  1610. #ifdef CONFIG_PREEMPT_RCU
  1611. #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
  1612. #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
  1613. static inline void rcu_copy_process(struct task_struct *p)
  1614. {
  1615. p->rcu_read_lock_nesting = 0;
  1616. p->rcu_read_unlock_special = 0;
  1617. #ifdef CONFIG_TREE_PREEMPT_RCU
  1618. p->rcu_blocked_node = NULL;
  1619. #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
  1620. #ifdef CONFIG_RCU_BOOST
  1621. p->rcu_boost_mutex = NULL;
  1622. #endif /* #ifdef CONFIG_RCU_BOOST */
  1623. INIT_LIST_HEAD(&p->rcu_node_entry);
  1624. }
  1625. #else
  1626. static inline void rcu_copy_process(struct task_struct *p)
  1627. {
  1628. }
  1629. #endif
  1630. static inline void tsk_restore_flags(struct task_struct *task,
  1631. unsigned long orig_flags, unsigned long flags)
  1632. {
  1633. task->flags &= ~flags;
  1634. task->flags |= orig_flags & flags;
  1635. }
  1636. #ifdef CONFIG_SMP
  1637. extern void do_set_cpus_allowed(struct task_struct *p,
  1638. const struct cpumask *new_mask);
  1639. extern int set_cpus_allowed_ptr(struct task_struct *p,
  1640. const struct cpumask *new_mask);
  1641. #else
  1642. static inline void do_set_cpus_allowed(struct task_struct *p,
  1643. const struct cpumask *new_mask)
  1644. {
  1645. }
  1646. static inline int set_cpus_allowed_ptr(struct task_struct *p,
  1647. const struct cpumask *new_mask)
  1648. {
  1649. if (!cpumask_test_cpu(0, new_mask))
  1650. return -EINVAL;
  1651. return 0;
  1652. }
  1653. #endif
  1654. #ifdef CONFIG_NO_HZ
  1655. void calc_load_enter_idle(void);
  1656. void calc_load_exit_idle(void);
  1657. #else
  1658. static inline void calc_load_enter_idle(void) { }
  1659. static inline void calc_load_exit_idle(void) { }
  1660. #endif /* CONFIG_NO_HZ */
  1661. #ifndef CONFIG_CPUMASK_OFFSTACK
  1662. static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
  1663. {
  1664. return set_cpus_allowed_ptr(p, &new_mask);
  1665. }
  1666. #endif
  1667. /*
  1668. * Do not use outside of architecture code which knows its limitations.
  1669. *
  1670. * sched_clock() has no promise of monotonicity or bounded drift between
  1671. * CPUs, use (which you should not) requires disabling IRQs.
  1672. *
  1673. * Please use one of the three interfaces below.
  1674. */
  1675. extern unsigned long long notrace sched_clock(void);
  1676. /*
  1677. * See the comment in kernel/sched/clock.c
  1678. */
  1679. extern u64 cpu_clock(int cpu);
  1680. extern u64 local_clock(void);
  1681. extern u64 sched_clock_cpu(int cpu);
  1682. extern void sched_clock_init(void);
  1683. #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
  1684. static inline void sched_clock_tick(void)
  1685. {
  1686. }
  1687. static inline void sched_clock_idle_sleep_event(void)
  1688. {
  1689. }
  1690. static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
  1691. {
  1692. }
  1693. #else
  1694. /*
  1695. * Architectures can set this to 1 if they have specified
  1696. * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
  1697. * but then during bootup it turns out that sched_clock()
  1698. * is reliable after all:
  1699. */
  1700. extern int sched_clock_stable;
  1701. extern void sched_clock_tick(void);
  1702. extern void sched_clock_idle_sleep_event(void);
  1703. extern void sched_clock_idle_wakeup_event(u64 delta_ns);
  1704. #endif
  1705. #ifdef CONFIG_IRQ_TIME_ACCOUNTING
  1706. /*
  1707. * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
  1708. * The reason for this explicit opt-in is not to have perf penalty with
  1709. * slow sched_clocks.
  1710. */
  1711. extern void enable_sched_clock_irqtime(void);
  1712. extern void disable_sched_clock_irqtime(void);
  1713. #else
  1714. static inline void enable_sched_clock_irqtime(void) {}
  1715. static inline void disable_sched_clock_irqtime(void) {}
  1716. #endif
  1717. extern unsigned long long
  1718. task_sched_runtime(struct task_struct *task);
  1719. /* sched_exec is called by processes performing an exec */
  1720. #ifdef CONFIG_SMP
  1721. extern void sched_exec(void);
  1722. #else
  1723. #define sched_exec() {}
  1724. #endif
  1725. extern void sched_clock_idle_sleep_event(void);
  1726. extern void sched_clock_idle_wakeup_event(u64 delta_ns);
  1727. #ifdef CONFIG_HOTPLUG_CPU
  1728. extern void idle_task_exit(void);
  1729. #else
  1730. static inline void idle_task_exit(void) {}
  1731. #endif
  1732. #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
  1733. extern void wake_up_idle_cpu(int cpu);
  1734. #else
  1735. static inline void wake_up_idle_cpu(int cpu) { }
  1736. #endif
  1737. extern unsigned int sysctl_sched_latency;
  1738. extern unsigned int sysctl_sched_min_granularity;
  1739. extern unsigned int sysctl_sched_wakeup_granularity;
  1740. extern unsigned int sysctl_sched_child_runs_first;
  1741. enum sched_tunable_scaling {
  1742. SCHED_TUNABLESCALING_NONE,
  1743. SCHED_TUNABLESCALING_LOG,
  1744. SCHED_TUNABLESCALING_LINEAR,
  1745. SCHED_TUNABLESCALING_END,
  1746. };
  1747. extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
  1748. extern unsigned int sysctl_numa_balancing_scan_delay;
  1749. extern unsigned int sysctl_numa_balancing_scan_period_min;
  1750. extern unsigned int sysctl_numa_balancing_scan_period_max;
  1751. extern unsigned int sysctl_numa_balancing_scan_period_reset;
  1752. extern unsigned int sysctl_numa_balancing_scan_size;
  1753. extern unsigned int sysctl_numa_balancing_settle_count;
  1754. #ifdef CONFIG_SCHED_DEBUG
  1755. extern unsigned int sysctl_sched_migration_cost;
  1756. extern unsigned int sysctl_sched_nr_migrate;
  1757. extern unsigned int sysctl_sched_time_avg;
  1758. extern unsigned int sysctl_timer_migration;
  1759. extern unsigned int sysctl_sched_shares_window;
  1760. int sched_proc_update_handler(struct ctl_table *table, int write,
  1761. void __user *buffer, size_t *length,
  1762. loff_t *ppos);
  1763. #endif
  1764. #ifdef CONFIG_SCHED_DEBUG
  1765. static inline unsigned int get_sysctl_timer_migration(void)
  1766. {
  1767. return sysctl_timer_migration;
  1768. }
  1769. #else
  1770. static inline unsigned int get_sysctl_timer_migration(void)
  1771. {
  1772. return 1;
  1773. }
  1774. #endif
  1775. extern unsigned int sysctl_sched_rt_period;
  1776. extern int sysctl_sched_rt_runtime;
  1777. int sched_rt_handler(struct ctl_table *table, int write,
  1778. void __user *buffer, size_t *lenp,
  1779. loff_t *ppos);
  1780. #ifdef CONFIG_SCHED_AUTOGROUP
  1781. extern unsigned int sysctl_sched_autogroup_enabled;
  1782. extern void sched_autogroup_create_attach(struct task_struct *p);
  1783. extern void sched_autogroup_detach(struct task_struct *p);
  1784. extern void sched_autogroup_fork(struct signal_struct *sig);
  1785. extern void sched_autogroup_exit(struct signal_struct *sig);
  1786. #ifdef CONFIG_PROC_FS
  1787. extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
  1788. extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
  1789. #endif
  1790. #else
  1791. static inline void sched_autogroup_create_attach(struct task_struct *p) { }
  1792. static inline void sched_autogroup_detach(struct task_struct *p) { }
  1793. static inline void sched_autogroup_fork(struct signal_struct *sig) { }
  1794. static inline void sched_autogroup_exit(struct signal_struct *sig) { }
  1795. #endif
  1796. #ifdef CONFIG_CFS_BANDWIDTH
  1797. extern unsigned int sysctl_sched_cfs_bandwidth_slice;
  1798. #endif
  1799. #ifdef CONFIG_RT_MUTEXES
  1800. extern int rt_mutex_getprio(struct task_struct *p);
  1801. extern void rt_mutex_setprio(struct task_struct *p, int prio);
  1802. extern void rt_mutex_adjust_pi(struct task_struct *p);
  1803. static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
  1804. {
  1805. return tsk->pi_blocked_on != NULL;
  1806. }
  1807. #else
  1808. static inline int rt_mutex_getprio(struct task_struct *p)
  1809. {
  1810. return p->normal_prio;
  1811. }
  1812. # define rt_mutex_adjust_pi(p) do { } while (0)
  1813. static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
  1814. {
  1815. return false;
  1816. }
  1817. #endif
  1818. extern bool yield_to(struct task_struct *p, bool preempt);
  1819. extern void set_user_nice(struct task_struct *p, long nice);
  1820. extern int task_prio(const struct task_struct *p);
  1821. extern int task_nice(const struct task_struct *p);
  1822. extern int can_nice(const struct task_struct *p, const int nice);
  1823. extern int task_curr(const struct task_struct *p);
  1824. extern int idle_cpu(int cpu);
  1825. extern int sched_setscheduler(struct task_struct *, int,
  1826. const struct sched_param *);
  1827. extern int sched_setscheduler_nocheck(struct task_struct *, int,
  1828. const struct sched_param *);
  1829. extern struct task_struct *idle_task(int cpu);
  1830. /**
  1831. * is_idle_task - is the specified task an idle task?
  1832. * @p: the task in question.
  1833. */
  1834. static inline bool is_idle_task(const struct task_struct *p)
  1835. {
  1836. return p->pid == 0;
  1837. }
  1838. extern struct task_struct *curr_task(int cpu);
  1839. extern void set_curr_task(int cpu, struct task_struct *p);
  1840. void yield(void);
  1841. /*
  1842. * The default (Linux) execution domain.
  1843. */
  1844. extern struct exec_domain default_exec_domain;
  1845. union thread_union {
  1846. struct thread_info thread_info;
  1847. unsigned long stack[THREAD_SIZE/sizeof(long)];
  1848. };
  1849. #ifndef __HAVE_ARCH_KSTACK_END
  1850. static inline int kstack_end(void *addr)
  1851. {
  1852. /* Reliable end of stack detection:
  1853. * Some APM bios versions misalign the stack
  1854. */
  1855. return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
  1856. }
  1857. #endif
  1858. extern union thread_union init_thread_union;
  1859. extern struct task_struct init_task;
  1860. extern struct mm_struct init_mm;
  1861. extern struct pid_namespace init_pid_ns;
  1862. /*
  1863. * find a task by one of its numerical ids
  1864. *
  1865. * find_task_by_pid_ns():
  1866. * finds a task by its pid in the specified namespace
  1867. * find_task_by_vpid():
  1868. * finds a task by its virtual pid
  1869. *
  1870. * see also find_vpid() etc in include/linux/pid.h
  1871. */
  1872. extern struct task_struct *find_task_by_vpid(pid_t nr);
  1873. extern struct task_struct *find_task_by_pid_ns(pid_t nr,
  1874. struct pid_namespace *ns);
  1875. extern void __set_special_pids(struct pid *pid);
  1876. /* per-UID process charging. */
  1877. extern struct user_struct * alloc_uid(kuid_t);
  1878. static inline struct user_struct *get_uid(struct user_struct *u)
  1879. {
  1880. atomic_inc(&u->__count);
  1881. return u;
  1882. }
  1883. extern void free_uid(struct user_struct *);
  1884. #include <asm/current.h>
  1885. extern void xtime_update(unsigned long ticks);
  1886. extern int wake_up_state(struct task_struct *tsk, unsigned int state);
  1887. extern int wake_up_process(struct task_struct *tsk);
  1888. extern void wake_up_new_task(struct task_struct *tsk);
  1889. #ifdef CONFIG_SMP
  1890. extern void kick_process(struct task_struct *tsk);
  1891. #else
  1892. static inline void kick_process(struct task_struct *tsk) { }
  1893. #endif
  1894. extern void sched_fork(struct task_struct *p);
  1895. extern void sched_dead(struct task_struct *p);
  1896. extern void proc_caches_init(void);
  1897. extern void flush_signals(struct task_struct *);
  1898. extern void __flush_signals(struct task_struct *);
  1899. extern void ignore_signals(struct task_struct *);
  1900. extern void flush_signal_handlers(struct task_struct *, int force_default);
  1901. extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
  1902. static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
  1903. {
  1904. unsigned long flags;
  1905. int ret;
  1906. spin_lock_irqsave(&tsk->sighand->siglock, flags);
  1907. ret = dequeue_signal(tsk, mask, info);
  1908. spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
  1909. return ret;
  1910. }
  1911. extern void block_all_signals(int (*notifier)(void *priv), void *priv,
  1912. sigset_t *mask);
  1913. extern void unblock_all_signals(void);
  1914. extern void release_task(struct task_struct * p);
  1915. extern int send_sig_info(int, struct siginfo *, struct task_struct *);
  1916. extern int force_sigsegv(int, struct task_struct *);
  1917. extern int force_sig_info(int, struct siginfo *, struct task_struct *);
  1918. extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
  1919. extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
  1920. extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
  1921. const struct cred *, u32);
  1922. extern int kill_pgrp(struct pid *pid, int sig, int priv);
  1923. extern int kill_pid(struct pid *pid, int sig, int priv);
  1924. extern int kill_proc_info(int, struct siginfo *, pid_t);
  1925. extern __must_check bool do_notify_parent(struct task_struct *, int);
  1926. extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
  1927. extern void force_sig(int, struct task_struct *);
  1928. extern int send_sig(int, struct task_struct *, int);
  1929. extern int zap_other_threads(struct task_struct *p);
  1930. extern struct sigqueue *sigqueue_alloc(void);
  1931. extern void sigqueue_free(struct sigqueue *);
  1932. extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
  1933. extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
  1934. extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
  1935. static inline void restore_saved_sigmask(void)
  1936. {
  1937. if (test_and_clear_restore_sigmask())
  1938. __set_current_blocked(&current->saved_sigmask);
  1939. }
  1940. static inline sigset_t *sigmask_to_save(void)
  1941. {
  1942. sigset_t *res = &current->blocked;
  1943. if (unlikely(test_restore_sigmask()))
  1944. res = &current->saved_sigmask;
  1945. return res;
  1946. }
  1947. static inline int kill_cad_pid(int sig, int priv)
  1948. {
  1949. return kill_pid(cad_pid, sig, priv);
  1950. }
  1951. /* These can be the second arg to send_sig_info/send_group_sig_info. */
  1952. #define SEND_SIG_NOINFO ((struct siginfo *) 0)
  1953. #define SEND_SIG_PRIV ((struct siginfo *) 1)
  1954. #define SEND_SIG_FORCED ((struct siginfo *) 2)
  1955. /*
  1956. * True if we are on the alternate signal stack.
  1957. */
  1958. static inline int on_sig_stack(unsigned long sp)
  1959. {
  1960. #ifdef CONFIG_STACK_GROWSUP
  1961. return sp >= current->sas_ss_sp &&
  1962. sp - current->sas_ss_sp < current->sas_ss_size;
  1963. #else
  1964. return sp > current->sas_ss_sp &&
  1965. sp - current->sas_ss_sp <= current->sas_ss_size;
  1966. #endif
  1967. }
  1968. static inline int sas_ss_flags(unsigned long sp)
  1969. {
  1970. return (current->sas_ss_size == 0 ? SS_DISABLE
  1971. : on_sig_stack(sp) ? SS_ONSTACK : 0);
  1972. }
  1973. /*
  1974. * Routines for handling mm_structs
  1975. */
  1976. extern struct mm_struct * mm_alloc(void);
  1977. /* mmdrop drops the mm and the page tables */
  1978. extern void __mmdrop(struct mm_struct *);
  1979. static inline void mmdrop(struct mm_struct * mm)
  1980. {
  1981. if (unlikely(atomic_dec_and_test(&mm->mm_count)))
  1982. __mmdrop(mm);
  1983. }
  1984. /* mmput gets rid of the mappings and all user-space */
  1985. extern void mmput(struct mm_struct *);
  1986. /* Grab a reference to a task's mm, if it is not already going away */
  1987. extern struct mm_struct *get_task_mm(struct task_struct *task);
  1988. /*
  1989. * Grab a reference to a task's mm, if it is not already going away
  1990. * and ptrace_may_access with the mode parameter passed to it
  1991. * succeeds.
  1992. */
  1993. extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
  1994. /* Remove the current tasks stale references to the old mm_struct */
  1995. extern void mm_release(struct task_struct *, struct mm_struct *);
  1996. /* Allocate a new mm structure and copy contents from tsk->mm */
  1997. extern struct mm_struct *dup_mm(struct task_struct *tsk);
  1998. extern int copy_thread(unsigned long, unsigned long, unsigned long,
  1999. struct task_struct *);
  2000. extern void flush_thread(void);
  2001. extern void exit_thread(void);
  2002. extern void exit_files(struct task_struct *);
  2003. extern void __cleanup_sighand(struct sighand_struct *);
  2004. extern void exit_itimers(struct signal_struct *);
  2005. extern void flush_itimer_signals(void);
  2006. extern void do_group_exit(int);
  2007. extern int allow_signal(int);
  2008. extern int disallow_signal(int);
  2009. extern int do_execve(const char *,
  2010. const char __user * const __user *,
  2011. const char __user * const __user *);
  2012. extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
  2013. struct task_struct *fork_idle(int);
  2014. #ifdef CONFIG_GENERIC_KERNEL_THREAD
  2015. extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  2016. #endif
  2017. extern void set_task_comm(struct task_struct *tsk, char *from);
  2018. extern char *get_task_comm(char *to, struct task_struct *tsk);
  2019. #ifdef CONFIG_SMP
  2020. void scheduler_ipi(void);
  2021. extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
  2022. #else
  2023. static inline void scheduler_ipi(void) { }
  2024. static inline unsigned long wait_task_inactive(struct task_struct *p,
  2025. long match_state)
  2026. {
  2027. return 1;
  2028. }
  2029. #endif
  2030. #define next_task(p) \
  2031. list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
  2032. #define for_each_process(p) \
  2033. for (p = &init_task ; (p = next_task(p)) != &init_task ; )
  2034. extern bool current_is_single_threaded(void);
  2035. /*
  2036. * Careful: do_each_thread/while_each_thread is a double loop so
  2037. * 'break' will not work as expected - use goto instead.
  2038. */
  2039. #define do_each_thread(g, t) \
  2040. for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
  2041. #define while_each_thread(g, t) \
  2042. while ((t = next_thread(t)) != g)
  2043. static inline int get_nr_threads(struct task_struct *tsk)
  2044. {
  2045. return tsk->signal->nr_threads;
  2046. }
  2047. static inline bool thread_group_leader(struct task_struct *p)
  2048. {
  2049. return p->exit_signal >= 0;
  2050. }
  2051. /* Do to the insanities of de_thread it is possible for a process
  2052. * to have the pid of the thread group leader without actually being
  2053. * the thread group leader. For iteration through the pids in proc
  2054. * all we care about is that we have a task with the appropriate
  2055. * pid, we don't actually care if we have the right task.
  2056. */
  2057. static inline int has_group_leader_pid(struct task_struct *p)
  2058. {
  2059. return p->pid == p->tgid;
  2060. }
  2061. static inline
  2062. int same_thread_group(struct task_struct *p1, struct task_struct *p2)
  2063. {
  2064. return p1->tgid == p2->tgid;
  2065. }
  2066. static inline struct task_struct *next_thread(const struct task_struct *p)
  2067. {
  2068. return list_entry_rcu(p->thread_group.next,
  2069. struct task_struct, thread_group);
  2070. }
  2071. static inline int thread_group_empty(struct task_struct *p)
  2072. {
  2073. return list_empty(&p->thread_group);
  2074. }
  2075. #define delay_group_leader(p) \
  2076. (thread_group_leader(p) && !thread_group_empty(p))
  2077. /*
  2078. * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
  2079. * subscriptions and synchronises with wait4(). Also used in procfs. Also
  2080. * pins the final release of task.io_context. Also protects ->cpuset and
  2081. * ->cgroup.subsys[]. And ->vfork_done.
  2082. *
  2083. * Nests both inside and outside of read_lock(&tasklist_lock).
  2084. * It must not be nested with write_lock_irq(&tasklist_lock),
  2085. * neither inside nor outside.
  2086. */
  2087. static inline void task_lock(struct task_struct *p)
  2088. {
  2089. spin_lock(&p->alloc_lock);
  2090. }
  2091. static inline void task_unlock(struct task_struct *p)
  2092. {
  2093. spin_unlock(&p->alloc_lock);
  2094. }
  2095. extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
  2096. unsigned long *flags);
  2097. static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
  2098. unsigned long *flags)
  2099. {
  2100. struct sighand_struct *ret;
  2101. ret = __lock_task_sighand(tsk, flags);
  2102. (void)__cond_lock(&tsk->sighand->siglock, ret);
  2103. return ret;
  2104. }
  2105. static inline void unlock_task_sighand(struct task_struct *tsk,
  2106. unsigned long *flags)
  2107. {
  2108. spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
  2109. }
  2110. #ifdef CONFIG_CGROUPS
  2111. static inline void threadgroup_change_begin(struct task_struct *tsk)
  2112. {
  2113. down_read(&tsk->signal->group_rwsem);
  2114. }
  2115. static inline void threadgroup_change_end(struct task_struct *tsk)
  2116. {
  2117. up_read(&tsk->signal->group_rwsem);
  2118. }
  2119. /**
  2120. * threadgroup_lock - lock threadgroup
  2121. * @tsk: member task of the threadgroup to lock
  2122. *
  2123. * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
  2124. * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
  2125. * perform exec. This is useful for cases where the threadgroup needs to
  2126. * stay stable across blockable operations.
  2127. *
  2128. * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
  2129. * synchronization. While held, no new task will be added to threadgroup
  2130. * and no existing live task will have its PF_EXITING set.
  2131. *
  2132. * During exec, a task goes and puts its thread group through unusual
  2133. * changes. After de-threading, exclusive access is assumed to resources
  2134. * which are usually shared by tasks in the same group - e.g. sighand may
  2135. * be replaced with a new one. Also, the exec'ing task takes over group
  2136. * leader role including its pid. Exclude these changes while locked by
  2137. * grabbing cred_guard_mutex which is used to synchronize exec path.
  2138. */
  2139. static inline void threadgroup_lock(struct task_struct *tsk)
  2140. {
  2141. /*
  2142. * exec uses exit for de-threading nesting group_rwsem inside
  2143. * cred_guard_mutex. Grab cred_guard_mutex first.
  2144. */
  2145. mutex_lock(&tsk->signal->cred_guard_mutex);
  2146. down_write(&tsk->signal->group_rwsem);
  2147. }
  2148. /**
  2149. * threadgroup_unlock - unlock threadgroup
  2150. * @tsk: member task of the threadgroup to unlock
  2151. *
  2152. * Reverse threadgroup_lock().
  2153. */
  2154. static inline void threadgroup_unlock(struct task_struct *tsk)
  2155. {
  2156. up_write(&tsk->signal->group_rwsem);
  2157. mutex_unlock(&tsk->signal->cred_guard_mutex);
  2158. }
  2159. #else
  2160. static inline void threadgroup_change_begin(struct task_struct *tsk) {}
  2161. static inline void threadgroup_change_end(struct task_struct *tsk) {}
  2162. static inline void threadgroup_lock(struct task_struct *tsk) {}
  2163. static inline void threadgroup_unlock(struct task_struct *tsk) {}
  2164. #endif
  2165. #ifndef __HAVE_THREAD_FUNCTIONS
  2166. #define task_thread_info(task) ((struct thread_info *)(task)->stack)
  2167. #define task_stack_page(task) ((task)->stack)
  2168. static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
  2169. {
  2170. *task_thread_info(p) = *task_thread_info(org);
  2171. task_thread_info(p)->task = p;
  2172. }
  2173. static inline unsigned long *end_of_stack(struct task_struct *p)
  2174. {
  2175. return (unsigned long *)(task_thread_info(p) + 1);
  2176. }
  2177. #endif
  2178. static inline int object_is_on_stack(void *obj)
  2179. {
  2180. void *stack = task_stack_page(current);
  2181. return (obj >= stack) && (obj < (stack + THREAD_SIZE));
  2182. }
  2183. extern void thread_info_cache_init(void);
  2184. #ifdef CONFIG_DEBUG_STACK_USAGE
  2185. static inline unsigned long stack_not_used(struct task_struct *p)
  2186. {
  2187. unsigned long *n = end_of_stack(p);
  2188. do { /* Skip over canary */
  2189. n++;
  2190. } while (!*n);
  2191. return (unsigned long)n - (unsigned long)end_of_stack(p);
  2192. }
  2193. #endif
  2194. /* set thread flags in other task's structures
  2195. * - see asm/thread_info.h for TIF_xxxx flags available
  2196. */
  2197. static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
  2198. {
  2199. set_ti_thread_flag(task_thread_info(tsk), flag);
  2200. }
  2201. static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
  2202. {
  2203. clear_ti_thread_flag(task_thread_info(tsk), flag);
  2204. }
  2205. static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
  2206. {
  2207. return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
  2208. }
  2209. static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
  2210. {
  2211. return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
  2212. }
  2213. static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
  2214. {
  2215. return test_ti_thread_flag(task_thread_info(tsk), flag);
  2216. }
  2217. static inline void set_tsk_need_resched(struct task_struct *tsk)
  2218. {
  2219. set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
  2220. }
  2221. static inline void clear_tsk_need_resched(struct task_struct *tsk)
  2222. {
  2223. clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
  2224. }
  2225. static inline int test_tsk_need_resched(struct task_struct *tsk)
  2226. {
  2227. return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
  2228. }
  2229. static inline int restart_syscall(void)
  2230. {
  2231. set_tsk_thread_flag(current, TIF_SIGPENDING);
  2232. return -ERESTARTNOINTR;
  2233. }
  2234. static inline int signal_pending(struct task_struct *p)
  2235. {
  2236. return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
  2237. }
  2238. static inline int __fatal_signal_pending(struct task_struct *p)
  2239. {
  2240. return unlikely(sigismember(&p->pending.signal, SIGKILL));
  2241. }
  2242. static inline int fatal_signal_pending(struct task_struct *p)
  2243. {
  2244. return signal_pending(p) && __fatal_signal_pending(p);
  2245. }
  2246. static inline int signal_pending_state(long state, struct task_struct *p)
  2247. {
  2248. if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
  2249. return 0;
  2250. if (!signal_pending(p))
  2251. return 0;
  2252. return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
  2253. }
  2254. static inline int need_resched(void)
  2255. {
  2256. return unlikely(test_thread_flag(TIF_NEED_RESCHED));
  2257. }
  2258. /*
  2259. * cond_resched() and cond_resched_lock(): latency reduction via
  2260. * explicit rescheduling in places that are safe. The return
  2261. * value indicates whether a reschedule was done in fact.
  2262. * cond_resched_lock() will drop the spinlock before scheduling,
  2263. * cond_resched_softirq() will enable bhs before scheduling.
  2264. */
  2265. extern int _cond_resched(void);
  2266. #define cond_resched() ({ \
  2267. __might_sleep(__FILE__, __LINE__, 0); \
  2268. _cond_resched(); \
  2269. })
  2270. extern int __cond_resched_lock(spinlock_t *lock);
  2271. #ifdef CONFIG_PREEMPT_COUNT
  2272. #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
  2273. #else
  2274. #define PREEMPT_LOCK_OFFSET 0
  2275. #endif
  2276. #define cond_resched_lock(lock) ({ \
  2277. __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
  2278. __cond_resched_lock(lock); \
  2279. })
  2280. extern int __cond_resched_softirq(void);
  2281. #define cond_resched_softirq() ({ \
  2282. __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
  2283. __cond_resched_softirq(); \
  2284. })
  2285. /*
  2286. * Does a critical section need to be broken due to another
  2287. * task waiting?: (technically does not depend on CONFIG_PREEMPT,
  2288. * but a general need for low latency)
  2289. */
  2290. static inline int spin_needbreak(spinlock_t *lock)
  2291. {
  2292. #ifdef CONFIG_PREEMPT
  2293. return spin_is_contended(lock);
  2294. #else
  2295. return 0;
  2296. #endif
  2297. }
  2298. /*
  2299. * Thread group CPU time accounting.
  2300. */
  2301. void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
  2302. void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
  2303. static inline void thread_group_cputime_init(struct signal_struct *sig)
  2304. {
  2305. raw_spin_lock_init(&sig->cputimer.lock);
  2306. }
  2307. /*
  2308. * Reevaluate whether the task has signals pending delivery.
  2309. * Wake the task if so.
  2310. * This is required every time the blocked sigset_t changes.
  2311. * callers must hold sighand->siglock.
  2312. */
  2313. extern void recalc_sigpending_and_wake(struct task_struct *t);
  2314. extern void recalc_sigpending(void);
  2315. extern void signal_wake_up(struct task_struct *t, int resume_stopped);
  2316. /*
  2317. * Wrappers for p->thread_info->cpu access. No-op on UP.
  2318. */
  2319. #ifdef CONFIG_SMP
  2320. static inline unsigned int task_cpu(const struct task_struct *p)
  2321. {
  2322. return task_thread_info(p)->cpu;
  2323. }
  2324. extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
  2325. #else
  2326. static inline unsigned int task_cpu(const struct task_struct *p)
  2327. {
  2328. return 0;
  2329. }
  2330. static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
  2331. {
  2332. }
  2333. #endif /* CONFIG_SMP */
  2334. extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
  2335. extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
  2336. extern void normalize_rt_tasks(void);
  2337. #ifdef CONFIG_CGROUP_SCHED
  2338. extern struct task_group root_task_group;
  2339. extern struct task_group *sched_create_group(struct task_group *parent);
  2340. extern void sched_destroy_group(struct task_group *tg);
  2341. extern void sched_move_task(struct task_struct *tsk);
  2342. #ifdef CONFIG_FAIR_GROUP_SCHED
  2343. extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
  2344. extern unsigned long sched_group_shares(struct task_group *tg);
  2345. #endif
  2346. #ifdef CONFIG_RT_GROUP_SCHED
  2347. extern int sched_group_set_rt_runtime(struct task_group *tg,
  2348. long rt_runtime_us);
  2349. extern long sched_group_rt_runtime(struct task_group *tg);
  2350. extern int sched_group_set_rt_period(struct task_group *tg,
  2351. long rt_period_us);
  2352. extern long sched_group_rt_period(struct task_group *tg);
  2353. extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
  2354. #endif
  2355. #endif /* CONFIG_CGROUP_SCHED */
  2356. extern int task_can_switch_user(struct user_struct *up,
  2357. struct task_struct *tsk);
  2358. #ifdef CONFIG_TASK_XACCT
  2359. static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
  2360. {
  2361. tsk->ioac.rchar += amt;
  2362. }
  2363. static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
  2364. {
  2365. tsk->ioac.wchar += amt;
  2366. }
  2367. static inline void inc_syscr(struct task_struct *tsk)
  2368. {
  2369. tsk->ioac.syscr++;
  2370. }
  2371. static inline void inc_syscw(struct task_struct *tsk)
  2372. {
  2373. tsk->ioac.syscw++;
  2374. }
  2375. #else
  2376. static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
  2377. {
  2378. }
  2379. static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
  2380. {
  2381. }
  2382. static inline void inc_syscr(struct task_struct *tsk)
  2383. {
  2384. }
  2385. static inline void inc_syscw(struct task_struct *tsk)
  2386. {
  2387. }
  2388. #endif
  2389. #ifndef TASK_SIZE_OF
  2390. #define TASK_SIZE_OF(tsk) TASK_SIZE
  2391. #endif
  2392. #ifdef CONFIG_MM_OWNER
  2393. extern void mm_update_next_owner(struct mm_struct *mm);
  2394. extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
  2395. #else
  2396. static inline void mm_update_next_owner(struct mm_struct *mm)
  2397. {
  2398. }
  2399. static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
  2400. {
  2401. }
  2402. #endif /* CONFIG_MM_OWNER */
  2403. static inline unsigned long task_rlimit(const struct task_struct *tsk,
  2404. unsigned int limit)
  2405. {
  2406. return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
  2407. }
  2408. static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
  2409. unsigned int limit)
  2410. {
  2411. return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
  2412. }
  2413. static inline unsigned long rlimit(unsigned int limit)
  2414. {
  2415. return task_rlimit(current, limit);
  2416. }
  2417. static inline unsigned long rlimit_max(unsigned int limit)
  2418. {
  2419. return task_rlimit_max(current, limit);
  2420. }
  2421. #endif