sched.h 64 KB

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  1. #ifndef _LINUX_SCHED_H
  2. #define _LINUX_SCHED_H
  3. /*
  4. * cloning flags:
  5. */
  6. #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
  7. #define CLONE_VM 0x00000100 /* set if VM shared between processes */
  8. #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
  9. #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
  10. #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
  11. #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
  12. #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
  13. #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
  14. #define CLONE_THREAD 0x00010000 /* Same thread group? */
  15. #define CLONE_NEWNS 0x00020000 /* New namespace group? */
  16. #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
  17. #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
  18. #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
  19. #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
  20. #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
  21. #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
  22. #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
  23. #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
  24. #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
  25. #define CLONE_NEWIPC 0x08000000 /* New ipcs */
  26. #define CLONE_NEWUSER 0x10000000 /* New user namespace */
  27. #define CLONE_NEWPID 0x20000000 /* New pid namespace */
  28. #define CLONE_NEWNET 0x40000000 /* New network namespace */
  29. #define CLONE_IO 0x80000000 /* Clone io context */
  30. /*
  31. * Scheduling policies
  32. */
  33. #define SCHED_NORMAL 0
  34. #define SCHED_FIFO 1
  35. #define SCHED_RR 2
  36. #define SCHED_BATCH 3
  37. /* SCHED_ISO: reserved but not implemented yet */
  38. #define SCHED_IDLE 5
  39. #ifdef __KERNEL__
  40. struct sched_param {
  41. int sched_priority;
  42. };
  43. #include <asm/param.h> /* for HZ */
  44. #include <linux/capability.h>
  45. #include <linux/threads.h>
  46. #include <linux/kernel.h>
  47. #include <linux/types.h>
  48. #include <linux/timex.h>
  49. #include <linux/jiffies.h>
  50. #include <linux/rbtree.h>
  51. #include <linux/thread_info.h>
  52. #include <linux/cpumask.h>
  53. #include <linux/errno.h>
  54. #include <linux/nodemask.h>
  55. #include <linux/mm_types.h>
  56. #include <asm/system.h>
  57. #include <asm/page.h>
  58. #include <asm/ptrace.h>
  59. #include <asm/cputime.h>
  60. #include <linux/smp.h>
  61. #include <linux/sem.h>
  62. #include <linux/signal.h>
  63. #include <linux/fs_struct.h>
  64. #include <linux/compiler.h>
  65. #include <linux/completion.h>
  66. #include <linux/pid.h>
  67. #include <linux/percpu.h>
  68. #include <linux/topology.h>
  69. #include <linux/proportions.h>
  70. #include <linux/seccomp.h>
  71. #include <linux/rcupdate.h>
  72. #include <linux/rtmutex.h>
  73. #include <linux/time.h>
  74. #include <linux/param.h>
  75. #include <linux/resource.h>
  76. #include <linux/timer.h>
  77. #include <linux/hrtimer.h>
  78. #include <linux/task_io_accounting.h>
  79. #include <linux/kobject.h>
  80. #include <linux/latencytop.h>
  81. #include <asm/processor.h>
  82. struct mem_cgroup;
  83. struct exec_domain;
  84. struct futex_pi_state;
  85. struct robust_list_head;
  86. struct bio;
  87. /*
  88. * List of flags we want to share for kernel threads,
  89. * if only because they are not used by them anyway.
  90. */
  91. #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
  92. /*
  93. * These are the constant used to fake the fixed-point load-average
  94. * counting. Some notes:
  95. * - 11 bit fractions expand to 22 bits by the multiplies: this gives
  96. * a load-average precision of 10 bits integer + 11 bits fractional
  97. * - if you want to count load-averages more often, you need more
  98. * precision, or rounding will get you. With 2-second counting freq,
  99. * the EXP_n values would be 1981, 2034 and 2043 if still using only
  100. * 11 bit fractions.
  101. */
  102. extern unsigned long avenrun[]; /* Load averages */
  103. #define FSHIFT 11 /* nr of bits of precision */
  104. #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
  105. #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
  106. #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
  107. #define EXP_5 2014 /* 1/exp(5sec/5min) */
  108. #define EXP_15 2037 /* 1/exp(5sec/15min) */
  109. #define CALC_LOAD(load,exp,n) \
  110. load *= exp; \
  111. load += n*(FIXED_1-exp); \
  112. load >>= FSHIFT;
  113. extern unsigned long total_forks;
  114. extern int nr_threads;
  115. DECLARE_PER_CPU(unsigned long, process_counts);
  116. extern int nr_processes(void);
  117. extern unsigned long nr_running(void);
  118. extern unsigned long nr_uninterruptible(void);
  119. extern unsigned long nr_active(void);
  120. extern unsigned long nr_iowait(void);
  121. extern unsigned long weighted_cpuload(const int cpu);
  122. struct seq_file;
  123. struct cfs_rq;
  124. struct task_group;
  125. #ifdef CONFIG_SCHED_DEBUG
  126. extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
  127. extern void proc_sched_set_task(struct task_struct *p);
  128. extern void
  129. print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
  130. #else
  131. static inline void
  132. proc_sched_show_task(struct task_struct *p, struct seq_file *m)
  133. {
  134. }
  135. static inline void proc_sched_set_task(struct task_struct *p)
  136. {
  137. }
  138. static inline void
  139. print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
  140. {
  141. }
  142. #endif
  143. /*
  144. * Task state bitmask. NOTE! These bits are also
  145. * encoded in fs/proc/array.c: get_task_state().
  146. *
  147. * We have two separate sets of flags: task->state
  148. * is about runnability, while task->exit_state are
  149. * about the task exiting. Confusing, but this way
  150. * modifying one set can't modify the other one by
  151. * mistake.
  152. */
  153. #define TASK_RUNNING 0
  154. #define TASK_INTERRUPTIBLE 1
  155. #define TASK_UNINTERRUPTIBLE 2
  156. #define __TASK_STOPPED 4
  157. #define __TASK_TRACED 8
  158. /* in tsk->exit_state */
  159. #define EXIT_ZOMBIE 16
  160. #define EXIT_DEAD 32
  161. /* in tsk->state again */
  162. #define TASK_DEAD 64
  163. #define TASK_WAKEKILL 128
  164. /* Convenience macros for the sake of set_task_state */
  165. #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
  166. #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
  167. #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
  168. /* Convenience macros for the sake of wake_up */
  169. #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
  170. #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
  171. /* get_task_state() */
  172. #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
  173. TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
  174. __TASK_TRACED)
  175. #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
  176. #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
  177. #define task_is_stopped_or_traced(task) \
  178. ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
  179. #define task_contributes_to_load(task) \
  180. ((task->state & TASK_UNINTERRUPTIBLE) != 0)
  181. #define __set_task_state(tsk, state_value) \
  182. do { (tsk)->state = (state_value); } while (0)
  183. #define set_task_state(tsk, state_value) \
  184. set_mb((tsk)->state, (state_value))
  185. /*
  186. * set_current_state() includes a barrier so that the write of current->state
  187. * is correctly serialised wrt the caller's subsequent test of whether to
  188. * actually sleep:
  189. *
  190. * set_current_state(TASK_UNINTERRUPTIBLE);
  191. * if (do_i_need_to_sleep())
  192. * schedule();
  193. *
  194. * If the caller does not need such serialisation then use __set_current_state()
  195. */
  196. #define __set_current_state(state_value) \
  197. do { current->state = (state_value); } while (0)
  198. #define set_current_state(state_value) \
  199. set_mb(current->state, (state_value))
  200. /* Task command name length */
  201. #define TASK_COMM_LEN 16
  202. #include <linux/spinlock.h>
  203. /*
  204. * This serializes "schedule()" and also protects
  205. * the run-queue from deletions/modifications (but
  206. * _adding_ to the beginning of the run-queue has
  207. * a separate lock).
  208. */
  209. extern rwlock_t tasklist_lock;
  210. extern spinlock_t mmlist_lock;
  211. struct task_struct;
  212. extern void sched_init(void);
  213. extern void sched_init_smp(void);
  214. extern asmlinkage void schedule_tail(struct task_struct *prev);
  215. extern void init_idle(struct task_struct *idle, int cpu);
  216. extern void init_idle_bootup_task(struct task_struct *idle);
  217. extern cpumask_t nohz_cpu_mask;
  218. #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
  219. extern int select_nohz_load_balancer(int cpu);
  220. #else
  221. static inline int select_nohz_load_balancer(int cpu)
  222. {
  223. return 0;
  224. }
  225. #endif
  226. extern unsigned long rt_needs_cpu(int cpu);
  227. /*
  228. * Only dump TASK_* tasks. (0 for all tasks)
  229. */
  230. extern void show_state_filter(unsigned long state_filter);
  231. static inline void show_state(void)
  232. {
  233. show_state_filter(0);
  234. }
  235. extern void show_regs(struct pt_regs *);
  236. /*
  237. * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
  238. * task), SP is the stack pointer of the first frame that should be shown in the back
  239. * trace (or NULL if the entire call-chain of the task should be shown).
  240. */
  241. extern void show_stack(struct task_struct *task, unsigned long *sp);
  242. void io_schedule(void);
  243. long io_schedule_timeout(long timeout);
  244. extern void cpu_init (void);
  245. extern void trap_init(void);
  246. extern void account_process_tick(struct task_struct *task, int user);
  247. extern void update_process_times(int user);
  248. extern void scheduler_tick(void);
  249. extern void hrtick_resched(void);
  250. extern void sched_show_task(struct task_struct *p);
  251. #ifdef CONFIG_DETECT_SOFTLOCKUP
  252. extern void softlockup_tick(void);
  253. extern void spawn_softlockup_task(void);
  254. extern void touch_softlockup_watchdog(void);
  255. extern void touch_all_softlockup_watchdogs(void);
  256. extern unsigned long softlockup_thresh;
  257. extern unsigned long sysctl_hung_task_check_count;
  258. extern unsigned long sysctl_hung_task_timeout_secs;
  259. extern unsigned long sysctl_hung_task_warnings;
  260. #else
  261. static inline void softlockup_tick(void)
  262. {
  263. }
  264. static inline void spawn_softlockup_task(void)
  265. {
  266. }
  267. static inline void touch_softlockup_watchdog(void)
  268. {
  269. }
  270. static inline void touch_all_softlockup_watchdogs(void)
  271. {
  272. }
  273. #endif
  274. /* Attach to any functions which should be ignored in wchan output. */
  275. #define __sched __attribute__((__section__(".sched.text")))
  276. /* Linker adds these: start and end of __sched functions */
  277. extern char __sched_text_start[], __sched_text_end[];
  278. /* Is this address in the __sched functions? */
  279. extern int in_sched_functions(unsigned long addr);
  280. #define MAX_SCHEDULE_TIMEOUT LONG_MAX
  281. extern signed long schedule_timeout(signed long timeout);
  282. extern signed long schedule_timeout_interruptible(signed long timeout);
  283. extern signed long schedule_timeout_killable(signed long timeout);
  284. extern signed long schedule_timeout_uninterruptible(signed long timeout);
  285. asmlinkage void schedule(void);
  286. struct nsproxy;
  287. struct user_namespace;
  288. /* Maximum number of active map areas.. This is a random (large) number */
  289. #define DEFAULT_MAX_MAP_COUNT 65536
  290. extern int sysctl_max_map_count;
  291. #include <linux/aio.h>
  292. extern unsigned long
  293. arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
  294. unsigned long, unsigned long);
  295. extern unsigned long
  296. arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
  297. unsigned long len, unsigned long pgoff,
  298. unsigned long flags);
  299. extern void arch_unmap_area(struct mm_struct *, unsigned long);
  300. extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
  301. #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
  302. /*
  303. * The mm counters are not protected by its page_table_lock,
  304. * so must be incremented atomically.
  305. */
  306. #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
  307. #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
  308. #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
  309. #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
  310. #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
  311. #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
  312. /*
  313. * The mm counters are protected by its page_table_lock,
  314. * so can be incremented directly.
  315. */
  316. #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
  317. #define get_mm_counter(mm, member) ((mm)->_##member)
  318. #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
  319. #define inc_mm_counter(mm, member) (mm)->_##member++
  320. #define dec_mm_counter(mm, member) (mm)->_##member--
  321. #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
  322. #define get_mm_rss(mm) \
  323. (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
  324. #define update_hiwater_rss(mm) do { \
  325. unsigned long _rss = get_mm_rss(mm); \
  326. if ((mm)->hiwater_rss < _rss) \
  327. (mm)->hiwater_rss = _rss; \
  328. } while (0)
  329. #define update_hiwater_vm(mm) do { \
  330. if ((mm)->hiwater_vm < (mm)->total_vm) \
  331. (mm)->hiwater_vm = (mm)->total_vm; \
  332. } while (0)
  333. extern void set_dumpable(struct mm_struct *mm, int value);
  334. extern int get_dumpable(struct mm_struct *mm);
  335. /* mm flags */
  336. /* dumpable bits */
  337. #define MMF_DUMPABLE 0 /* core dump is permitted */
  338. #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
  339. #define MMF_DUMPABLE_BITS 2
  340. /* coredump filter bits */
  341. #define MMF_DUMP_ANON_PRIVATE 2
  342. #define MMF_DUMP_ANON_SHARED 3
  343. #define MMF_DUMP_MAPPED_PRIVATE 4
  344. #define MMF_DUMP_MAPPED_SHARED 5
  345. #define MMF_DUMP_ELF_HEADERS 6
  346. #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
  347. #define MMF_DUMP_FILTER_BITS 5
  348. #define MMF_DUMP_FILTER_MASK \
  349. (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
  350. #define MMF_DUMP_FILTER_DEFAULT \
  351. ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
  352. struct sighand_struct {
  353. atomic_t count;
  354. struct k_sigaction action[_NSIG];
  355. spinlock_t siglock;
  356. wait_queue_head_t signalfd_wqh;
  357. };
  358. struct pacct_struct {
  359. int ac_flag;
  360. long ac_exitcode;
  361. unsigned long ac_mem;
  362. cputime_t ac_utime, ac_stime;
  363. unsigned long ac_minflt, ac_majflt;
  364. };
  365. /*
  366. * NOTE! "signal_struct" does not have it's own
  367. * locking, because a shared signal_struct always
  368. * implies a shared sighand_struct, so locking
  369. * sighand_struct is always a proper superset of
  370. * the locking of signal_struct.
  371. */
  372. struct signal_struct {
  373. atomic_t count;
  374. atomic_t live;
  375. wait_queue_head_t wait_chldexit; /* for wait4() */
  376. /* current thread group signal load-balancing target: */
  377. struct task_struct *curr_target;
  378. /* shared signal handling: */
  379. struct sigpending shared_pending;
  380. /* thread group exit support */
  381. int group_exit_code;
  382. /* overloaded:
  383. * - notify group_exit_task when ->count is equal to notify_count
  384. * - everyone except group_exit_task is stopped during signal delivery
  385. * of fatal signals, group_exit_task processes the signal.
  386. */
  387. struct task_struct *group_exit_task;
  388. int notify_count;
  389. /* thread group stop support, overloads group_exit_code too */
  390. int group_stop_count;
  391. unsigned int flags; /* see SIGNAL_* flags below */
  392. /* POSIX.1b Interval Timers */
  393. struct list_head posix_timers;
  394. /* ITIMER_REAL timer for the process */
  395. struct hrtimer real_timer;
  396. struct pid *leader_pid;
  397. ktime_t it_real_incr;
  398. /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
  399. cputime_t it_prof_expires, it_virt_expires;
  400. cputime_t it_prof_incr, it_virt_incr;
  401. /* job control IDs */
  402. /*
  403. * pgrp and session fields are deprecated.
  404. * use the task_session_Xnr and task_pgrp_Xnr routines below
  405. */
  406. union {
  407. pid_t pgrp __deprecated;
  408. pid_t __pgrp;
  409. };
  410. struct pid *tty_old_pgrp;
  411. union {
  412. pid_t session __deprecated;
  413. pid_t __session;
  414. };
  415. /* boolean value for session group leader */
  416. int leader;
  417. struct tty_struct *tty; /* NULL if no tty */
  418. /*
  419. * Cumulative resource counters for dead threads in the group,
  420. * and for reaped dead child processes forked by this group.
  421. * Live threads maintain their own counters and add to these
  422. * in __exit_signal, except for the group leader.
  423. */
  424. cputime_t utime, stime, cutime, cstime;
  425. cputime_t gtime;
  426. cputime_t cgtime;
  427. unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
  428. unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
  429. unsigned long inblock, oublock, cinblock, coublock;
  430. /*
  431. * Cumulative ns of scheduled CPU time for dead threads in the
  432. * group, not including a zombie group leader. (This only differs
  433. * from jiffies_to_ns(utime + stime) if sched_clock uses something
  434. * other than jiffies.)
  435. */
  436. unsigned long long sum_sched_runtime;
  437. /*
  438. * We don't bother to synchronize most readers of this at all,
  439. * because there is no reader checking a limit that actually needs
  440. * to get both rlim_cur and rlim_max atomically, and either one
  441. * alone is a single word that can safely be read normally.
  442. * getrlimit/setrlimit use task_lock(current->group_leader) to
  443. * protect this instead of the siglock, because they really
  444. * have no need to disable irqs.
  445. */
  446. struct rlimit rlim[RLIM_NLIMITS];
  447. struct list_head cpu_timers[3];
  448. /* keep the process-shared keyrings here so that they do the right
  449. * thing in threads created with CLONE_THREAD */
  450. #ifdef CONFIG_KEYS
  451. struct key *session_keyring; /* keyring inherited over fork */
  452. struct key *process_keyring; /* keyring private to this process */
  453. #endif
  454. #ifdef CONFIG_BSD_PROCESS_ACCT
  455. struct pacct_struct pacct; /* per-process accounting information */
  456. #endif
  457. #ifdef CONFIG_TASKSTATS
  458. struct taskstats *stats;
  459. #endif
  460. #ifdef CONFIG_AUDIT
  461. unsigned audit_tty;
  462. struct tty_audit_buf *tty_audit_buf;
  463. #endif
  464. };
  465. /* Context switch must be unlocked if interrupts are to be enabled */
  466. #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
  467. # define __ARCH_WANT_UNLOCKED_CTXSW
  468. #endif
  469. /*
  470. * Bits in flags field of signal_struct.
  471. */
  472. #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
  473. #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
  474. #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
  475. #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
  476. /*
  477. * Pending notifications to parent.
  478. */
  479. #define SIGNAL_CLD_STOPPED 0x00000010
  480. #define SIGNAL_CLD_CONTINUED 0x00000020
  481. #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
  482. #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
  483. /* If true, all threads except ->group_exit_task have pending SIGKILL */
  484. static inline int signal_group_exit(const struct signal_struct *sig)
  485. {
  486. return (sig->flags & SIGNAL_GROUP_EXIT) ||
  487. (sig->group_exit_task != NULL);
  488. }
  489. /*
  490. * Some day this will be a full-fledged user tracking system..
  491. */
  492. struct user_struct {
  493. atomic_t __count; /* reference count */
  494. atomic_t processes; /* How many processes does this user have? */
  495. atomic_t files; /* How many open files does this user have? */
  496. atomic_t sigpending; /* How many pending signals does this user have? */
  497. #ifdef CONFIG_INOTIFY_USER
  498. atomic_t inotify_watches; /* How many inotify watches does this user have? */
  499. atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
  500. #endif
  501. #ifdef CONFIG_POSIX_MQUEUE
  502. /* protected by mq_lock */
  503. unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
  504. #endif
  505. unsigned long locked_shm; /* How many pages of mlocked shm ? */
  506. #ifdef CONFIG_KEYS
  507. struct key *uid_keyring; /* UID specific keyring */
  508. struct key *session_keyring; /* UID's default session keyring */
  509. #endif
  510. /* Hash table maintenance information */
  511. struct hlist_node uidhash_node;
  512. uid_t uid;
  513. #ifdef CONFIG_USER_SCHED
  514. struct task_group *tg;
  515. #ifdef CONFIG_SYSFS
  516. struct kobject kobj;
  517. struct work_struct work;
  518. #endif
  519. #endif
  520. };
  521. extern int uids_sysfs_init(void);
  522. extern struct user_struct *find_user(uid_t);
  523. extern struct user_struct root_user;
  524. #define INIT_USER (&root_user)
  525. struct backing_dev_info;
  526. struct reclaim_state;
  527. #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
  528. struct sched_info {
  529. /* cumulative counters */
  530. unsigned long pcount; /* # of times run on this cpu */
  531. unsigned long long cpu_time, /* time spent on the cpu */
  532. run_delay; /* time spent waiting on a runqueue */
  533. /* timestamps */
  534. unsigned long long last_arrival,/* when we last ran on a cpu */
  535. last_queued; /* when we were last queued to run */
  536. #ifdef CONFIG_SCHEDSTATS
  537. /* BKL stats */
  538. unsigned int bkl_count;
  539. #endif
  540. };
  541. #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
  542. #ifdef CONFIG_SCHEDSTATS
  543. extern const struct file_operations proc_schedstat_operations;
  544. #endif /* CONFIG_SCHEDSTATS */
  545. #ifdef CONFIG_TASK_DELAY_ACCT
  546. struct task_delay_info {
  547. spinlock_t lock;
  548. unsigned int flags; /* Private per-task flags */
  549. /* For each stat XXX, add following, aligned appropriately
  550. *
  551. * struct timespec XXX_start, XXX_end;
  552. * u64 XXX_delay;
  553. * u32 XXX_count;
  554. *
  555. * Atomicity of updates to XXX_delay, XXX_count protected by
  556. * single lock above (split into XXX_lock if contention is an issue).
  557. */
  558. /*
  559. * XXX_count is incremented on every XXX operation, the delay
  560. * associated with the operation is added to XXX_delay.
  561. * XXX_delay contains the accumulated delay time in nanoseconds.
  562. */
  563. struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
  564. u64 blkio_delay; /* wait for sync block io completion */
  565. u64 swapin_delay; /* wait for swapin block io completion */
  566. u32 blkio_count; /* total count of the number of sync block */
  567. /* io operations performed */
  568. u32 swapin_count; /* total count of the number of swapin block */
  569. /* io operations performed */
  570. };
  571. #endif /* CONFIG_TASK_DELAY_ACCT */
  572. static inline int sched_info_on(void)
  573. {
  574. #ifdef CONFIG_SCHEDSTATS
  575. return 1;
  576. #elif defined(CONFIG_TASK_DELAY_ACCT)
  577. extern int delayacct_on;
  578. return delayacct_on;
  579. #else
  580. return 0;
  581. #endif
  582. }
  583. enum cpu_idle_type {
  584. CPU_IDLE,
  585. CPU_NOT_IDLE,
  586. CPU_NEWLY_IDLE,
  587. CPU_MAX_IDLE_TYPES
  588. };
  589. /*
  590. * sched-domains (multiprocessor balancing) declarations:
  591. */
  592. /*
  593. * Increase resolution of nice-level calculations:
  594. */
  595. #define SCHED_LOAD_SHIFT 10
  596. #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
  597. #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
  598. #ifdef CONFIG_SMP
  599. #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
  600. #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
  601. #define SD_BALANCE_EXEC 4 /* Balance on exec */
  602. #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
  603. #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
  604. #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
  605. #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
  606. #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
  607. #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
  608. #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
  609. #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
  610. #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */
  611. #define BALANCE_FOR_MC_POWER \
  612. (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
  613. #define BALANCE_FOR_PKG_POWER \
  614. ((sched_mc_power_savings || sched_smt_power_savings) ? \
  615. SD_POWERSAVINGS_BALANCE : 0)
  616. #define test_sd_parent(sd, flag) ((sd->parent && \
  617. (sd->parent->flags & flag)) ? 1 : 0)
  618. struct sched_group {
  619. struct sched_group *next; /* Must be a circular list */
  620. cpumask_t cpumask;
  621. /*
  622. * CPU power of this group, SCHED_LOAD_SCALE being max power for a
  623. * single CPU. This is read only (except for setup, hotplug CPU).
  624. * Note : Never change cpu_power without recompute its reciprocal
  625. */
  626. unsigned int __cpu_power;
  627. /*
  628. * reciprocal value of cpu_power to avoid expensive divides
  629. * (see include/linux/reciprocal_div.h)
  630. */
  631. u32 reciprocal_cpu_power;
  632. };
  633. enum sched_domain_level {
  634. SD_LV_NONE = 0,
  635. SD_LV_SIBLING,
  636. SD_LV_MC,
  637. SD_LV_CPU,
  638. SD_LV_NODE,
  639. SD_LV_ALLNODES,
  640. SD_LV_MAX
  641. };
  642. struct sched_domain_attr {
  643. int relax_domain_level;
  644. };
  645. #define SD_ATTR_INIT (struct sched_domain_attr) { \
  646. .relax_domain_level = -1, \
  647. }
  648. struct sched_domain {
  649. /* These fields must be setup */
  650. struct sched_domain *parent; /* top domain must be null terminated */
  651. struct sched_domain *child; /* bottom domain must be null terminated */
  652. struct sched_group *groups; /* the balancing groups of the domain */
  653. cpumask_t span; /* span of all CPUs in this domain */
  654. int first_cpu; /* cache of the first cpu in this domain */
  655. unsigned long min_interval; /* Minimum balance interval ms */
  656. unsigned long max_interval; /* Maximum balance interval ms */
  657. unsigned int busy_factor; /* less balancing by factor if busy */
  658. unsigned int imbalance_pct; /* No balance until over watermark */
  659. unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
  660. unsigned int busy_idx;
  661. unsigned int idle_idx;
  662. unsigned int newidle_idx;
  663. unsigned int wake_idx;
  664. unsigned int forkexec_idx;
  665. int flags; /* See SD_* */
  666. enum sched_domain_level level;
  667. /* Runtime fields. */
  668. unsigned long last_balance; /* init to jiffies. units in jiffies */
  669. unsigned int balance_interval; /* initialise to 1. units in ms. */
  670. unsigned int nr_balance_failed; /* initialise to 0 */
  671. #ifdef CONFIG_SCHEDSTATS
  672. /* load_balance() stats */
  673. unsigned int lb_count[CPU_MAX_IDLE_TYPES];
  674. unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
  675. unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
  676. unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
  677. unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
  678. unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
  679. unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
  680. unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
  681. /* Active load balancing */
  682. unsigned int alb_count;
  683. unsigned int alb_failed;
  684. unsigned int alb_pushed;
  685. /* SD_BALANCE_EXEC stats */
  686. unsigned int sbe_count;
  687. unsigned int sbe_balanced;
  688. unsigned int sbe_pushed;
  689. /* SD_BALANCE_FORK stats */
  690. unsigned int sbf_count;
  691. unsigned int sbf_balanced;
  692. unsigned int sbf_pushed;
  693. /* try_to_wake_up() stats */
  694. unsigned int ttwu_wake_remote;
  695. unsigned int ttwu_move_affine;
  696. unsigned int ttwu_move_balance;
  697. #endif
  698. };
  699. extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
  700. struct sched_domain_attr *dattr_new);
  701. extern int arch_reinit_sched_domains(void);
  702. #endif /* CONFIG_SMP */
  703. /*
  704. * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
  705. * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
  706. * task of nice 0 or enough lower priority tasks to bring up the
  707. * weighted_cpuload
  708. */
  709. static inline int above_background_load(void)
  710. {
  711. unsigned long cpu;
  712. for_each_online_cpu(cpu) {
  713. if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
  714. return 1;
  715. }
  716. return 0;
  717. }
  718. struct io_context; /* See blkdev.h */
  719. #define NGROUPS_SMALL 32
  720. #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
  721. struct group_info {
  722. int ngroups;
  723. atomic_t usage;
  724. gid_t small_block[NGROUPS_SMALL];
  725. int nblocks;
  726. gid_t *blocks[0];
  727. };
  728. /*
  729. * get_group_info() must be called with the owning task locked (via task_lock())
  730. * when task != current. The reason being that the vast majority of callers are
  731. * looking at current->group_info, which can not be changed except by the
  732. * current task. Changing current->group_info requires the task lock, too.
  733. */
  734. #define get_group_info(group_info) do { \
  735. atomic_inc(&(group_info)->usage); \
  736. } while (0)
  737. #define put_group_info(group_info) do { \
  738. if (atomic_dec_and_test(&(group_info)->usage)) \
  739. groups_free(group_info); \
  740. } while (0)
  741. extern struct group_info *groups_alloc(int gidsetsize);
  742. extern void groups_free(struct group_info *group_info);
  743. extern int set_current_groups(struct group_info *group_info);
  744. extern int groups_search(struct group_info *group_info, gid_t grp);
  745. /* access the groups "array" with this macro */
  746. #define GROUP_AT(gi, i) \
  747. ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
  748. #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
  749. extern void prefetch_stack(struct task_struct *t);
  750. #else
  751. static inline void prefetch_stack(struct task_struct *t) { }
  752. #endif
  753. struct audit_context; /* See audit.c */
  754. struct mempolicy;
  755. struct pipe_inode_info;
  756. struct uts_namespace;
  757. struct rq;
  758. struct sched_domain;
  759. struct sched_class {
  760. const struct sched_class *next;
  761. void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
  762. void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
  763. void (*yield_task) (struct rq *rq);
  764. int (*select_task_rq)(struct task_struct *p, int sync);
  765. void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
  766. struct task_struct * (*pick_next_task) (struct rq *rq);
  767. void (*put_prev_task) (struct rq *rq, struct task_struct *p);
  768. #ifdef CONFIG_SMP
  769. unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
  770. struct rq *busiest, unsigned long max_load_move,
  771. struct sched_domain *sd, enum cpu_idle_type idle,
  772. int *all_pinned, int *this_best_prio);
  773. int (*move_one_task) (struct rq *this_rq, int this_cpu,
  774. struct rq *busiest, struct sched_domain *sd,
  775. enum cpu_idle_type idle);
  776. void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
  777. void (*post_schedule) (struct rq *this_rq);
  778. void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
  779. #endif
  780. void (*set_curr_task) (struct rq *rq);
  781. void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
  782. void (*task_new) (struct rq *rq, struct task_struct *p);
  783. void (*set_cpus_allowed)(struct task_struct *p,
  784. const cpumask_t *newmask);
  785. void (*join_domain)(struct rq *rq);
  786. void (*leave_domain)(struct rq *rq);
  787. void (*switched_from) (struct rq *this_rq, struct task_struct *task,
  788. int running);
  789. void (*switched_to) (struct rq *this_rq, struct task_struct *task,
  790. int running);
  791. void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
  792. int oldprio, int running);
  793. #ifdef CONFIG_FAIR_GROUP_SCHED
  794. void (*moved_group) (struct task_struct *p);
  795. #endif
  796. };
  797. struct load_weight {
  798. unsigned long weight, inv_weight;
  799. };
  800. /*
  801. * CFS stats for a schedulable entity (task, task-group etc)
  802. *
  803. * Current field usage histogram:
  804. *
  805. * 4 se->block_start
  806. * 4 se->run_node
  807. * 4 se->sleep_start
  808. * 6 se->load.weight
  809. */
  810. struct sched_entity {
  811. struct load_weight load; /* for load-balancing */
  812. struct rb_node run_node;
  813. struct list_head group_node;
  814. unsigned int on_rq;
  815. u64 exec_start;
  816. u64 sum_exec_runtime;
  817. u64 vruntime;
  818. u64 prev_sum_exec_runtime;
  819. u64 last_wakeup;
  820. u64 avg_overlap;
  821. #ifdef CONFIG_SCHEDSTATS
  822. u64 wait_start;
  823. u64 wait_max;
  824. u64 wait_count;
  825. u64 wait_sum;
  826. u64 sleep_start;
  827. u64 sleep_max;
  828. s64 sum_sleep_runtime;
  829. u64 block_start;
  830. u64 block_max;
  831. u64 exec_max;
  832. u64 slice_max;
  833. u64 nr_migrations;
  834. u64 nr_migrations_cold;
  835. u64 nr_failed_migrations_affine;
  836. u64 nr_failed_migrations_running;
  837. u64 nr_failed_migrations_hot;
  838. u64 nr_forced_migrations;
  839. u64 nr_forced2_migrations;
  840. u64 nr_wakeups;
  841. u64 nr_wakeups_sync;
  842. u64 nr_wakeups_migrate;
  843. u64 nr_wakeups_local;
  844. u64 nr_wakeups_remote;
  845. u64 nr_wakeups_affine;
  846. u64 nr_wakeups_affine_attempts;
  847. u64 nr_wakeups_passive;
  848. u64 nr_wakeups_idle;
  849. #endif
  850. #ifdef CONFIG_FAIR_GROUP_SCHED
  851. struct sched_entity *parent;
  852. /* rq on which this entity is (to be) queued: */
  853. struct cfs_rq *cfs_rq;
  854. /* rq "owned" by this entity/group: */
  855. struct cfs_rq *my_q;
  856. #endif
  857. };
  858. struct sched_rt_entity {
  859. struct list_head run_list;
  860. unsigned int time_slice;
  861. unsigned long timeout;
  862. int nr_cpus_allowed;
  863. struct sched_rt_entity *back;
  864. #ifdef CONFIG_RT_GROUP_SCHED
  865. struct sched_rt_entity *parent;
  866. /* rq on which this entity is (to be) queued: */
  867. struct rt_rq *rt_rq;
  868. /* rq "owned" by this entity/group: */
  869. struct rt_rq *my_q;
  870. #endif
  871. };
  872. struct task_struct {
  873. volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
  874. void *stack;
  875. atomic_t usage;
  876. unsigned int flags; /* per process flags, defined below */
  877. unsigned int ptrace;
  878. int lock_depth; /* BKL lock depth */
  879. #ifdef CONFIG_SMP
  880. #ifdef __ARCH_WANT_UNLOCKED_CTXSW
  881. int oncpu;
  882. #endif
  883. #endif
  884. int prio, static_prio, normal_prio;
  885. const struct sched_class *sched_class;
  886. struct sched_entity se;
  887. struct sched_rt_entity rt;
  888. #ifdef CONFIG_PREEMPT_NOTIFIERS
  889. /* list of struct preempt_notifier: */
  890. struct hlist_head preempt_notifiers;
  891. #endif
  892. /*
  893. * fpu_counter contains the number of consecutive context switches
  894. * that the FPU is used. If this is over a threshold, the lazy fpu
  895. * saving becomes unlazy to save the trap. This is an unsigned char
  896. * so that after 256 times the counter wraps and the behavior turns
  897. * lazy again; this to deal with bursty apps that only use FPU for
  898. * a short time
  899. */
  900. unsigned char fpu_counter;
  901. s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
  902. #ifdef CONFIG_BLK_DEV_IO_TRACE
  903. unsigned int btrace_seq;
  904. #endif
  905. unsigned int policy;
  906. cpumask_t cpus_allowed;
  907. #ifdef CONFIG_PREEMPT_RCU
  908. int rcu_read_lock_nesting;
  909. int rcu_flipctr_idx;
  910. #endif /* #ifdef CONFIG_PREEMPT_RCU */
  911. #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
  912. struct sched_info sched_info;
  913. #endif
  914. struct list_head tasks;
  915. /*
  916. * ptrace_list/ptrace_children forms the list of my children
  917. * that were stolen by a ptracer.
  918. */
  919. struct list_head ptrace_children;
  920. struct list_head ptrace_list;
  921. struct mm_struct *mm, *active_mm;
  922. /* task state */
  923. struct linux_binfmt *binfmt;
  924. int exit_state;
  925. int exit_code, exit_signal;
  926. int pdeath_signal; /* The signal sent when the parent dies */
  927. /* ??? */
  928. unsigned int personality;
  929. unsigned did_exec:1;
  930. pid_t pid;
  931. pid_t tgid;
  932. #ifdef CONFIG_CC_STACKPROTECTOR
  933. /* Canary value for the -fstack-protector gcc feature */
  934. unsigned long stack_canary;
  935. #endif
  936. /*
  937. * pointers to (original) parent process, youngest child, younger sibling,
  938. * older sibling, respectively. (p->father can be replaced with
  939. * p->parent->pid)
  940. */
  941. struct task_struct *real_parent; /* real parent process (when being debugged) */
  942. struct task_struct *parent; /* parent process */
  943. /*
  944. * children/sibling forms the list of my children plus the
  945. * tasks I'm ptracing.
  946. */
  947. struct list_head children; /* list of my children */
  948. struct list_head sibling; /* linkage in my parent's children list */
  949. struct task_struct *group_leader; /* threadgroup leader */
  950. /* PID/PID hash table linkage. */
  951. struct pid_link pids[PIDTYPE_MAX];
  952. struct list_head thread_group;
  953. struct completion *vfork_done; /* for vfork() */
  954. int __user *set_child_tid; /* CLONE_CHILD_SETTID */
  955. int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
  956. unsigned int rt_priority;
  957. cputime_t utime, stime, utimescaled, stimescaled;
  958. cputime_t gtime;
  959. cputime_t prev_utime, prev_stime;
  960. unsigned long nvcsw, nivcsw; /* context switch counts */
  961. struct timespec start_time; /* monotonic time */
  962. struct timespec real_start_time; /* boot based time */
  963. /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
  964. unsigned long min_flt, maj_flt;
  965. cputime_t it_prof_expires, it_virt_expires;
  966. unsigned long long it_sched_expires;
  967. struct list_head cpu_timers[3];
  968. /* process credentials */
  969. uid_t uid,euid,suid,fsuid;
  970. gid_t gid,egid,sgid,fsgid;
  971. struct group_info *group_info;
  972. kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset;
  973. unsigned securebits;
  974. struct user_struct *user;
  975. #ifdef CONFIG_KEYS
  976. struct key *request_key_auth; /* assumed request_key authority */
  977. struct key *thread_keyring; /* keyring private to this thread */
  978. unsigned char jit_keyring; /* default keyring to attach requested keys to */
  979. #endif
  980. char comm[TASK_COMM_LEN]; /* executable name excluding path
  981. - access with [gs]et_task_comm (which lock
  982. it with task_lock())
  983. - initialized normally by flush_old_exec */
  984. /* file system info */
  985. int link_count, total_link_count;
  986. #ifdef CONFIG_SYSVIPC
  987. /* ipc stuff */
  988. struct sysv_sem sysvsem;
  989. #endif
  990. #ifdef CONFIG_DETECT_SOFTLOCKUP
  991. /* hung task detection */
  992. unsigned long last_switch_timestamp;
  993. unsigned long last_switch_count;
  994. #endif
  995. /* CPU-specific state of this task */
  996. struct thread_struct thread;
  997. /* filesystem information */
  998. struct fs_struct *fs;
  999. /* open file information */
  1000. struct files_struct *files;
  1001. /* namespaces */
  1002. struct nsproxy *nsproxy;
  1003. /* signal handlers */
  1004. struct signal_struct *signal;
  1005. struct sighand_struct *sighand;
  1006. sigset_t blocked, real_blocked;
  1007. sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
  1008. struct sigpending pending;
  1009. unsigned long sas_ss_sp;
  1010. size_t sas_ss_size;
  1011. int (*notifier)(void *priv);
  1012. void *notifier_data;
  1013. sigset_t *notifier_mask;
  1014. #ifdef CONFIG_SECURITY
  1015. void *security;
  1016. #endif
  1017. struct audit_context *audit_context;
  1018. #ifdef CONFIG_AUDITSYSCALL
  1019. uid_t loginuid;
  1020. unsigned int sessionid;
  1021. #endif
  1022. seccomp_t seccomp;
  1023. /* Thread group tracking */
  1024. u32 parent_exec_id;
  1025. u32 self_exec_id;
  1026. /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
  1027. spinlock_t alloc_lock;
  1028. /* Protection of the PI data structures: */
  1029. spinlock_t pi_lock;
  1030. #ifdef CONFIG_RT_MUTEXES
  1031. /* PI waiters blocked on a rt_mutex held by this task */
  1032. struct plist_head pi_waiters;
  1033. /* Deadlock detection and priority inheritance handling */
  1034. struct rt_mutex_waiter *pi_blocked_on;
  1035. #endif
  1036. #ifdef CONFIG_DEBUG_MUTEXES
  1037. /* mutex deadlock detection */
  1038. struct mutex_waiter *blocked_on;
  1039. #endif
  1040. #ifdef CONFIG_TRACE_IRQFLAGS
  1041. unsigned int irq_events;
  1042. int hardirqs_enabled;
  1043. unsigned long hardirq_enable_ip;
  1044. unsigned int hardirq_enable_event;
  1045. unsigned long hardirq_disable_ip;
  1046. unsigned int hardirq_disable_event;
  1047. int softirqs_enabled;
  1048. unsigned long softirq_disable_ip;
  1049. unsigned int softirq_disable_event;
  1050. unsigned long softirq_enable_ip;
  1051. unsigned int softirq_enable_event;
  1052. int hardirq_context;
  1053. int softirq_context;
  1054. #endif
  1055. #ifdef CONFIG_LOCKDEP
  1056. # define MAX_LOCK_DEPTH 48UL
  1057. u64 curr_chain_key;
  1058. int lockdep_depth;
  1059. struct held_lock held_locks[MAX_LOCK_DEPTH];
  1060. unsigned int lockdep_recursion;
  1061. #endif
  1062. /* journalling filesystem info */
  1063. void *journal_info;
  1064. /* stacked block device info */
  1065. struct bio *bio_list, **bio_tail;
  1066. /* VM state */
  1067. struct reclaim_state *reclaim_state;
  1068. struct backing_dev_info *backing_dev_info;
  1069. struct io_context *io_context;
  1070. unsigned long ptrace_message;
  1071. siginfo_t *last_siginfo; /* For ptrace use. */
  1072. #ifdef CONFIG_TASK_XACCT
  1073. /* i/o counters(bytes read/written, #syscalls */
  1074. u64 rchar, wchar, syscr, syscw;
  1075. #endif
  1076. struct task_io_accounting ioac;
  1077. #if defined(CONFIG_TASK_XACCT)
  1078. u64 acct_rss_mem1; /* accumulated rss usage */
  1079. u64 acct_vm_mem1; /* accumulated virtual memory usage */
  1080. cputime_t acct_stimexpd;/* stime since last update */
  1081. #endif
  1082. #ifdef CONFIG_NUMA
  1083. struct mempolicy *mempolicy;
  1084. short il_next;
  1085. #endif
  1086. #ifdef CONFIG_CPUSETS
  1087. nodemask_t mems_allowed;
  1088. int cpuset_mems_generation;
  1089. int cpuset_mem_spread_rotor;
  1090. #endif
  1091. #ifdef CONFIG_CGROUPS
  1092. /* Control Group info protected by css_set_lock */
  1093. struct css_set *cgroups;
  1094. /* cg_list protected by css_set_lock and tsk->alloc_lock */
  1095. struct list_head cg_list;
  1096. #endif
  1097. #ifdef CONFIG_FUTEX
  1098. struct robust_list_head __user *robust_list;
  1099. #ifdef CONFIG_COMPAT
  1100. struct compat_robust_list_head __user *compat_robust_list;
  1101. #endif
  1102. struct list_head pi_state_list;
  1103. struct futex_pi_state *pi_state_cache;
  1104. #endif
  1105. atomic_t fs_excl; /* holding fs exclusive resources */
  1106. struct rcu_head rcu;
  1107. /*
  1108. * cache last used pipe for splice
  1109. */
  1110. struct pipe_inode_info *splice_pipe;
  1111. #ifdef CONFIG_TASK_DELAY_ACCT
  1112. struct task_delay_info *delays;
  1113. #endif
  1114. #ifdef CONFIG_FAULT_INJECTION
  1115. int make_it_fail;
  1116. #endif
  1117. struct prop_local_single dirties;
  1118. #ifdef CONFIG_LATENCYTOP
  1119. int latency_record_count;
  1120. struct latency_record latency_record[LT_SAVECOUNT];
  1121. #endif
  1122. };
  1123. /*
  1124. * Priority of a process goes from 0..MAX_PRIO-1, valid RT
  1125. * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
  1126. * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
  1127. * values are inverted: lower p->prio value means higher priority.
  1128. *
  1129. * The MAX_USER_RT_PRIO value allows the actual maximum
  1130. * RT priority to be separate from the value exported to
  1131. * user-space. This allows kernel threads to set their
  1132. * priority to a value higher than any user task. Note:
  1133. * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
  1134. */
  1135. #define MAX_USER_RT_PRIO 100
  1136. #define MAX_RT_PRIO MAX_USER_RT_PRIO
  1137. #define MAX_PRIO (MAX_RT_PRIO + 40)
  1138. #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
  1139. static inline int rt_prio(int prio)
  1140. {
  1141. if (unlikely(prio < MAX_RT_PRIO))
  1142. return 1;
  1143. return 0;
  1144. }
  1145. static inline int rt_task(struct task_struct *p)
  1146. {
  1147. return rt_prio(p->prio);
  1148. }
  1149. static inline void set_task_session(struct task_struct *tsk, pid_t session)
  1150. {
  1151. tsk->signal->__session = session;
  1152. }
  1153. static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
  1154. {
  1155. tsk->signal->__pgrp = pgrp;
  1156. }
  1157. static inline struct pid *task_pid(struct task_struct *task)
  1158. {
  1159. return task->pids[PIDTYPE_PID].pid;
  1160. }
  1161. static inline struct pid *task_tgid(struct task_struct *task)
  1162. {
  1163. return task->group_leader->pids[PIDTYPE_PID].pid;
  1164. }
  1165. static inline struct pid *task_pgrp(struct task_struct *task)
  1166. {
  1167. return task->group_leader->pids[PIDTYPE_PGID].pid;
  1168. }
  1169. static inline struct pid *task_session(struct task_struct *task)
  1170. {
  1171. return task->group_leader->pids[PIDTYPE_SID].pid;
  1172. }
  1173. struct pid_namespace;
  1174. /*
  1175. * the helpers to get the task's different pids as they are seen
  1176. * from various namespaces
  1177. *
  1178. * task_xid_nr() : global id, i.e. the id seen from the init namespace;
  1179. * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
  1180. * current.
  1181. * task_xid_nr_ns() : id seen from the ns specified;
  1182. *
  1183. * set_task_vxid() : assigns a virtual id to a task;
  1184. *
  1185. * see also pid_nr() etc in include/linux/pid.h
  1186. */
  1187. static inline pid_t task_pid_nr(struct task_struct *tsk)
  1188. {
  1189. return tsk->pid;
  1190. }
  1191. pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
  1192. static inline pid_t task_pid_vnr(struct task_struct *tsk)
  1193. {
  1194. return pid_vnr(task_pid(tsk));
  1195. }
  1196. static inline pid_t task_tgid_nr(struct task_struct *tsk)
  1197. {
  1198. return tsk->tgid;
  1199. }
  1200. pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
  1201. static inline pid_t task_tgid_vnr(struct task_struct *tsk)
  1202. {
  1203. return pid_vnr(task_tgid(tsk));
  1204. }
  1205. static inline pid_t task_pgrp_nr(struct task_struct *tsk)
  1206. {
  1207. return tsk->signal->__pgrp;
  1208. }
  1209. pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
  1210. static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
  1211. {
  1212. return pid_vnr(task_pgrp(tsk));
  1213. }
  1214. static inline pid_t task_session_nr(struct task_struct *tsk)
  1215. {
  1216. return tsk->signal->__session;
  1217. }
  1218. pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
  1219. static inline pid_t task_session_vnr(struct task_struct *tsk)
  1220. {
  1221. return pid_vnr(task_session(tsk));
  1222. }
  1223. /**
  1224. * pid_alive - check that a task structure is not stale
  1225. * @p: Task structure to be checked.
  1226. *
  1227. * Test if a process is not yet dead (at most zombie state)
  1228. * If pid_alive fails, then pointers within the task structure
  1229. * can be stale and must not be dereferenced.
  1230. */
  1231. static inline int pid_alive(struct task_struct *p)
  1232. {
  1233. return p->pids[PIDTYPE_PID].pid != NULL;
  1234. }
  1235. /**
  1236. * is_global_init - check if a task structure is init
  1237. * @tsk: Task structure to be checked.
  1238. *
  1239. * Check if a task structure is the first user space task the kernel created.
  1240. */
  1241. static inline int is_global_init(struct task_struct *tsk)
  1242. {
  1243. return tsk->pid == 1;
  1244. }
  1245. /*
  1246. * is_container_init:
  1247. * check whether in the task is init in its own pid namespace.
  1248. */
  1249. extern int is_container_init(struct task_struct *tsk);
  1250. extern struct pid *cad_pid;
  1251. extern void free_task(struct task_struct *tsk);
  1252. #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
  1253. extern void __put_task_struct(struct task_struct *t);
  1254. static inline void put_task_struct(struct task_struct *t)
  1255. {
  1256. if (atomic_dec_and_test(&t->usage))
  1257. __put_task_struct(t);
  1258. }
  1259. /*
  1260. * Per process flags
  1261. */
  1262. #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
  1263. /* Not implemented yet, only for 486*/
  1264. #define PF_STARTING 0x00000002 /* being created */
  1265. #define PF_EXITING 0x00000004 /* getting shut down */
  1266. #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
  1267. #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
  1268. #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
  1269. #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
  1270. #define PF_DUMPCORE 0x00000200 /* dumped core */
  1271. #define PF_SIGNALED 0x00000400 /* killed by a signal */
  1272. #define PF_MEMALLOC 0x00000800 /* Allocating memory */
  1273. #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
  1274. #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
  1275. #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
  1276. #define PF_FROZEN 0x00010000 /* frozen for system suspend */
  1277. #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
  1278. #define PF_KSWAPD 0x00040000 /* I am kswapd */
  1279. #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
  1280. #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
  1281. #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
  1282. #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
  1283. #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
  1284. #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
  1285. #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
  1286. #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
  1287. #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
  1288. #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
  1289. /*
  1290. * Only the _current_ task can read/write to tsk->flags, but other
  1291. * tasks can access tsk->flags in readonly mode for example
  1292. * with tsk_used_math (like during threaded core dumping).
  1293. * There is however an exception to this rule during ptrace
  1294. * or during fork: the ptracer task is allowed to write to the
  1295. * child->flags of its traced child (same goes for fork, the parent
  1296. * can write to the child->flags), because we're guaranteed the
  1297. * child is not running and in turn not changing child->flags
  1298. * at the same time the parent does it.
  1299. */
  1300. #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
  1301. #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
  1302. #define clear_used_math() clear_stopped_child_used_math(current)
  1303. #define set_used_math() set_stopped_child_used_math(current)
  1304. #define conditional_stopped_child_used_math(condition, child) \
  1305. do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
  1306. #define conditional_used_math(condition) \
  1307. conditional_stopped_child_used_math(condition, current)
  1308. #define copy_to_stopped_child_used_math(child) \
  1309. do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
  1310. /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
  1311. #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
  1312. #define used_math() tsk_used_math(current)
  1313. #ifdef CONFIG_SMP
  1314. extern int set_cpus_allowed_ptr(struct task_struct *p,
  1315. const cpumask_t *new_mask);
  1316. #else
  1317. static inline int set_cpus_allowed_ptr(struct task_struct *p,
  1318. const cpumask_t *new_mask)
  1319. {
  1320. if (!cpu_isset(0, *new_mask))
  1321. return -EINVAL;
  1322. return 0;
  1323. }
  1324. #endif
  1325. static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
  1326. {
  1327. return set_cpus_allowed_ptr(p, &new_mask);
  1328. }
  1329. extern unsigned long long sched_clock(void);
  1330. /*
  1331. * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
  1332. * clock constructed from sched_clock():
  1333. */
  1334. extern unsigned long long cpu_clock(int cpu);
  1335. extern unsigned long long
  1336. task_sched_runtime(struct task_struct *task);
  1337. /* sched_exec is called by processes performing an exec */
  1338. #ifdef CONFIG_SMP
  1339. extern void sched_exec(void);
  1340. #else
  1341. #define sched_exec() {}
  1342. #endif
  1343. extern void sched_clock_idle_sleep_event(void);
  1344. extern void sched_clock_idle_wakeup_event(u64 delta_ns);
  1345. #ifdef CONFIG_HOTPLUG_CPU
  1346. extern void idle_task_exit(void);
  1347. #else
  1348. static inline void idle_task_exit(void) {}
  1349. #endif
  1350. extern void sched_idle_next(void);
  1351. #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
  1352. extern void wake_up_idle_cpu(int cpu);
  1353. #else
  1354. static inline void wake_up_idle_cpu(int cpu) { }
  1355. #endif
  1356. #ifdef CONFIG_SCHED_DEBUG
  1357. extern unsigned int sysctl_sched_latency;
  1358. extern unsigned int sysctl_sched_min_granularity;
  1359. extern unsigned int sysctl_sched_wakeup_granularity;
  1360. extern unsigned int sysctl_sched_child_runs_first;
  1361. extern unsigned int sysctl_sched_features;
  1362. extern unsigned int sysctl_sched_migration_cost;
  1363. extern unsigned int sysctl_sched_nr_migrate;
  1364. int sched_nr_latency_handler(struct ctl_table *table, int write,
  1365. struct file *file, void __user *buffer, size_t *length,
  1366. loff_t *ppos);
  1367. #endif
  1368. extern unsigned int sysctl_sched_rt_period;
  1369. extern int sysctl_sched_rt_runtime;
  1370. int sched_rt_handler(struct ctl_table *table, int write,
  1371. struct file *filp, void __user *buffer, size_t *lenp,
  1372. loff_t *ppos);
  1373. extern unsigned int sysctl_sched_compat_yield;
  1374. #ifdef CONFIG_RT_MUTEXES
  1375. extern int rt_mutex_getprio(struct task_struct *p);
  1376. extern void rt_mutex_setprio(struct task_struct *p, int prio);
  1377. extern void rt_mutex_adjust_pi(struct task_struct *p);
  1378. #else
  1379. static inline int rt_mutex_getprio(struct task_struct *p)
  1380. {
  1381. return p->normal_prio;
  1382. }
  1383. # define rt_mutex_adjust_pi(p) do { } while (0)
  1384. #endif
  1385. extern void set_user_nice(struct task_struct *p, long nice);
  1386. extern int task_prio(const struct task_struct *p);
  1387. extern int task_nice(const struct task_struct *p);
  1388. extern int can_nice(const struct task_struct *p, const int nice);
  1389. extern int task_curr(const struct task_struct *p);
  1390. extern int idle_cpu(int cpu);
  1391. extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
  1392. extern struct task_struct *idle_task(int cpu);
  1393. extern struct task_struct *curr_task(int cpu);
  1394. extern void set_curr_task(int cpu, struct task_struct *p);
  1395. void yield(void);
  1396. /*
  1397. * The default (Linux) execution domain.
  1398. */
  1399. extern struct exec_domain default_exec_domain;
  1400. union thread_union {
  1401. struct thread_info thread_info;
  1402. unsigned long stack[THREAD_SIZE/sizeof(long)];
  1403. };
  1404. #ifndef __HAVE_ARCH_KSTACK_END
  1405. static inline int kstack_end(void *addr)
  1406. {
  1407. /* Reliable end of stack detection:
  1408. * Some APM bios versions misalign the stack
  1409. */
  1410. return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
  1411. }
  1412. #endif
  1413. extern union thread_union init_thread_union;
  1414. extern struct task_struct init_task;
  1415. extern struct mm_struct init_mm;
  1416. extern struct pid_namespace init_pid_ns;
  1417. /*
  1418. * find a task by one of its numerical ids
  1419. *
  1420. * find_task_by_pid_type_ns():
  1421. * it is the most generic call - it finds a task by all id,
  1422. * type and namespace specified
  1423. * find_task_by_pid_ns():
  1424. * finds a task by its pid in the specified namespace
  1425. * find_task_by_vpid():
  1426. * finds a task by its virtual pid
  1427. * find_task_by_pid():
  1428. * finds a task by its global pid
  1429. *
  1430. * see also find_pid() etc in include/linux/pid.h
  1431. */
  1432. extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
  1433. struct pid_namespace *ns);
  1434. static inline struct task_struct *__deprecated find_task_by_pid(pid_t nr)
  1435. {
  1436. return find_task_by_pid_type_ns(PIDTYPE_PID, nr, &init_pid_ns);
  1437. }
  1438. extern struct task_struct *find_task_by_vpid(pid_t nr);
  1439. extern struct task_struct *find_task_by_pid_ns(pid_t nr,
  1440. struct pid_namespace *ns);
  1441. extern void __set_special_pids(struct pid *pid);
  1442. /* per-UID process charging. */
  1443. extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
  1444. static inline struct user_struct *get_uid(struct user_struct *u)
  1445. {
  1446. atomic_inc(&u->__count);
  1447. return u;
  1448. }
  1449. extern void free_uid(struct user_struct *);
  1450. extern void switch_uid(struct user_struct *);
  1451. extern void release_uids(struct user_namespace *ns);
  1452. #include <asm/current.h>
  1453. extern void do_timer(unsigned long ticks);
  1454. extern int wake_up_state(struct task_struct *tsk, unsigned int state);
  1455. extern int wake_up_process(struct task_struct *tsk);
  1456. extern void wake_up_new_task(struct task_struct *tsk,
  1457. unsigned long clone_flags);
  1458. #ifdef CONFIG_SMP
  1459. extern void kick_process(struct task_struct *tsk);
  1460. #else
  1461. static inline void kick_process(struct task_struct *tsk) { }
  1462. #endif
  1463. extern void sched_fork(struct task_struct *p, int clone_flags);
  1464. extern void sched_dead(struct task_struct *p);
  1465. extern int in_group_p(gid_t);
  1466. extern int in_egroup_p(gid_t);
  1467. extern void proc_caches_init(void);
  1468. extern void flush_signals(struct task_struct *);
  1469. extern void ignore_signals(struct task_struct *);
  1470. extern void flush_signal_handlers(struct task_struct *, int force_default);
  1471. extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
  1472. static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
  1473. {
  1474. unsigned long flags;
  1475. int ret;
  1476. spin_lock_irqsave(&tsk->sighand->siglock, flags);
  1477. ret = dequeue_signal(tsk, mask, info);
  1478. spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
  1479. return ret;
  1480. }
  1481. extern void block_all_signals(int (*notifier)(void *priv), void *priv,
  1482. sigset_t *mask);
  1483. extern void unblock_all_signals(void);
  1484. extern void release_task(struct task_struct * p);
  1485. extern int send_sig_info(int, struct siginfo *, struct task_struct *);
  1486. extern int force_sigsegv(int, struct task_struct *);
  1487. extern int force_sig_info(int, struct siginfo *, struct task_struct *);
  1488. extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
  1489. extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
  1490. extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
  1491. extern int kill_pgrp(struct pid *pid, int sig, int priv);
  1492. extern int kill_pid(struct pid *pid, int sig, int priv);
  1493. extern int kill_proc_info(int, struct siginfo *, pid_t);
  1494. extern void do_notify_parent(struct task_struct *, int);
  1495. extern void force_sig(int, struct task_struct *);
  1496. extern void force_sig_specific(int, struct task_struct *);
  1497. extern int send_sig(int, struct task_struct *, int);
  1498. extern void zap_other_threads(struct task_struct *p);
  1499. extern int kill_proc(pid_t, int, int);
  1500. extern struct sigqueue *sigqueue_alloc(void);
  1501. extern void sigqueue_free(struct sigqueue *);
  1502. extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
  1503. extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
  1504. extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
  1505. static inline int kill_cad_pid(int sig, int priv)
  1506. {
  1507. return kill_pid(cad_pid, sig, priv);
  1508. }
  1509. /* These can be the second arg to send_sig_info/send_group_sig_info. */
  1510. #define SEND_SIG_NOINFO ((struct siginfo *) 0)
  1511. #define SEND_SIG_PRIV ((struct siginfo *) 1)
  1512. #define SEND_SIG_FORCED ((struct siginfo *) 2)
  1513. static inline int is_si_special(const struct siginfo *info)
  1514. {
  1515. return info <= SEND_SIG_FORCED;
  1516. }
  1517. /* True if we are on the alternate signal stack. */
  1518. static inline int on_sig_stack(unsigned long sp)
  1519. {
  1520. return (sp - current->sas_ss_sp < current->sas_ss_size);
  1521. }
  1522. static inline int sas_ss_flags(unsigned long sp)
  1523. {
  1524. return (current->sas_ss_size == 0 ? SS_DISABLE
  1525. : on_sig_stack(sp) ? SS_ONSTACK : 0);
  1526. }
  1527. /*
  1528. * Routines for handling mm_structs
  1529. */
  1530. extern struct mm_struct * mm_alloc(void);
  1531. /* mmdrop drops the mm and the page tables */
  1532. extern void __mmdrop(struct mm_struct *);
  1533. static inline void mmdrop(struct mm_struct * mm)
  1534. {
  1535. if (unlikely(atomic_dec_and_test(&mm->mm_count)))
  1536. __mmdrop(mm);
  1537. }
  1538. /* mmput gets rid of the mappings and all user-space */
  1539. extern void mmput(struct mm_struct *);
  1540. /* Grab a reference to a task's mm, if it is not already going away */
  1541. extern struct mm_struct *get_task_mm(struct task_struct *task);
  1542. /* Remove the current tasks stale references to the old mm_struct */
  1543. extern void mm_release(struct task_struct *, struct mm_struct *);
  1544. /* Allocate a new mm structure and copy contents from tsk->mm */
  1545. extern struct mm_struct *dup_mm(struct task_struct *tsk);
  1546. extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
  1547. extern void flush_thread(void);
  1548. extern void exit_thread(void);
  1549. extern void exit_files(struct task_struct *);
  1550. extern void __cleanup_signal(struct signal_struct *);
  1551. extern void __cleanup_sighand(struct sighand_struct *);
  1552. extern void exit_itimers(struct signal_struct *);
  1553. extern NORET_TYPE void do_group_exit(int);
  1554. extern void daemonize(const char *, ...);
  1555. extern int allow_signal(int);
  1556. extern int disallow_signal(int);
  1557. extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
  1558. extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
  1559. struct task_struct *fork_idle(int);
  1560. extern void set_task_comm(struct task_struct *tsk, char *from);
  1561. extern char *get_task_comm(char *to, struct task_struct *tsk);
  1562. #ifdef CONFIG_SMP
  1563. extern void wait_task_inactive(struct task_struct * p);
  1564. #else
  1565. #define wait_task_inactive(p) do { } while (0)
  1566. #endif
  1567. #define remove_parent(p) list_del_init(&(p)->sibling)
  1568. #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
  1569. #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
  1570. #define for_each_process(p) \
  1571. for (p = &init_task ; (p = next_task(p)) != &init_task ; )
  1572. /*
  1573. * Careful: do_each_thread/while_each_thread is a double loop so
  1574. * 'break' will not work as expected - use goto instead.
  1575. */
  1576. #define do_each_thread(g, t) \
  1577. for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
  1578. #define while_each_thread(g, t) \
  1579. while ((t = next_thread(t)) != g)
  1580. /* de_thread depends on thread_group_leader not being a pid based check */
  1581. #define thread_group_leader(p) (p == p->group_leader)
  1582. /* Do to the insanities of de_thread it is possible for a process
  1583. * to have the pid of the thread group leader without actually being
  1584. * the thread group leader. For iteration through the pids in proc
  1585. * all we care about is that we have a task with the appropriate
  1586. * pid, we don't actually care if we have the right task.
  1587. */
  1588. static inline int has_group_leader_pid(struct task_struct *p)
  1589. {
  1590. return p->pid == p->tgid;
  1591. }
  1592. static inline
  1593. int same_thread_group(struct task_struct *p1, struct task_struct *p2)
  1594. {
  1595. return p1->tgid == p2->tgid;
  1596. }
  1597. static inline struct task_struct *next_thread(const struct task_struct *p)
  1598. {
  1599. return list_entry(rcu_dereference(p->thread_group.next),
  1600. struct task_struct, thread_group);
  1601. }
  1602. static inline int thread_group_empty(struct task_struct *p)
  1603. {
  1604. return list_empty(&p->thread_group);
  1605. }
  1606. #define delay_group_leader(p) \
  1607. (thread_group_leader(p) && !thread_group_empty(p))
  1608. /*
  1609. * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
  1610. * subscriptions and synchronises with wait4(). Also used in procfs. Also
  1611. * pins the final release of task.io_context. Also protects ->cpuset and
  1612. * ->cgroup.subsys[].
  1613. *
  1614. * Nests both inside and outside of read_lock(&tasklist_lock).
  1615. * It must not be nested with write_lock_irq(&tasklist_lock),
  1616. * neither inside nor outside.
  1617. */
  1618. static inline void task_lock(struct task_struct *p)
  1619. {
  1620. spin_lock(&p->alloc_lock);
  1621. }
  1622. static inline void task_unlock(struct task_struct *p)
  1623. {
  1624. spin_unlock(&p->alloc_lock);
  1625. }
  1626. extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
  1627. unsigned long *flags);
  1628. static inline void unlock_task_sighand(struct task_struct *tsk,
  1629. unsigned long *flags)
  1630. {
  1631. spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
  1632. }
  1633. #ifndef __HAVE_THREAD_FUNCTIONS
  1634. #define task_thread_info(task) ((struct thread_info *)(task)->stack)
  1635. #define task_stack_page(task) ((task)->stack)
  1636. static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
  1637. {
  1638. *task_thread_info(p) = *task_thread_info(org);
  1639. task_thread_info(p)->task = p;
  1640. }
  1641. static inline unsigned long *end_of_stack(struct task_struct *p)
  1642. {
  1643. return (unsigned long *)(task_thread_info(p) + 1);
  1644. }
  1645. #endif
  1646. extern void thread_info_cache_init(void);
  1647. /* set thread flags in other task's structures
  1648. * - see asm/thread_info.h for TIF_xxxx flags available
  1649. */
  1650. static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
  1651. {
  1652. set_ti_thread_flag(task_thread_info(tsk), flag);
  1653. }
  1654. static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
  1655. {
  1656. clear_ti_thread_flag(task_thread_info(tsk), flag);
  1657. }
  1658. static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
  1659. {
  1660. return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
  1661. }
  1662. static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
  1663. {
  1664. return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
  1665. }
  1666. static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
  1667. {
  1668. return test_ti_thread_flag(task_thread_info(tsk), flag);
  1669. }
  1670. static inline void set_tsk_need_resched(struct task_struct *tsk)
  1671. {
  1672. set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
  1673. }
  1674. static inline void clear_tsk_need_resched(struct task_struct *tsk)
  1675. {
  1676. clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
  1677. }
  1678. static inline int test_tsk_need_resched(struct task_struct *tsk)
  1679. {
  1680. return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
  1681. }
  1682. static inline int signal_pending(struct task_struct *p)
  1683. {
  1684. return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
  1685. }
  1686. extern int __fatal_signal_pending(struct task_struct *p);
  1687. static inline int fatal_signal_pending(struct task_struct *p)
  1688. {
  1689. return signal_pending(p) && __fatal_signal_pending(p);
  1690. }
  1691. static inline int need_resched(void)
  1692. {
  1693. return unlikely(test_tsk_need_resched(current));
  1694. }
  1695. /*
  1696. * cond_resched() and cond_resched_lock(): latency reduction via
  1697. * explicit rescheduling in places that are safe. The return
  1698. * value indicates whether a reschedule was done in fact.
  1699. * cond_resched_lock() will drop the spinlock before scheduling,
  1700. * cond_resched_softirq() will enable bhs before scheduling.
  1701. */
  1702. #ifdef CONFIG_PREEMPT
  1703. static inline int cond_resched(void)
  1704. {
  1705. return 0;
  1706. }
  1707. #else
  1708. extern int _cond_resched(void);
  1709. static inline int cond_resched(void)
  1710. {
  1711. return _cond_resched();
  1712. }
  1713. #endif
  1714. extern int cond_resched_lock(spinlock_t * lock);
  1715. extern int cond_resched_softirq(void);
  1716. /*
  1717. * Does a critical section need to be broken due to another
  1718. * task waiting?: (technically does not depend on CONFIG_PREEMPT,
  1719. * but a general need for low latency)
  1720. */
  1721. static inline int spin_needbreak(spinlock_t *lock)
  1722. {
  1723. #ifdef CONFIG_PREEMPT
  1724. return spin_is_contended(lock);
  1725. #else
  1726. return 0;
  1727. #endif
  1728. }
  1729. /*
  1730. * Reevaluate whether the task has signals pending delivery.
  1731. * Wake the task if so.
  1732. * This is required every time the blocked sigset_t changes.
  1733. * callers must hold sighand->siglock.
  1734. */
  1735. extern void recalc_sigpending_and_wake(struct task_struct *t);
  1736. extern void recalc_sigpending(void);
  1737. extern void signal_wake_up(struct task_struct *t, int resume_stopped);
  1738. /*
  1739. * Wrappers for p->thread_info->cpu access. No-op on UP.
  1740. */
  1741. #ifdef CONFIG_SMP
  1742. static inline unsigned int task_cpu(const struct task_struct *p)
  1743. {
  1744. return task_thread_info(p)->cpu;
  1745. }
  1746. extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
  1747. #else
  1748. static inline unsigned int task_cpu(const struct task_struct *p)
  1749. {
  1750. return 0;
  1751. }
  1752. static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
  1753. {
  1754. }
  1755. #endif /* CONFIG_SMP */
  1756. #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
  1757. extern void arch_pick_mmap_layout(struct mm_struct *mm);
  1758. #else
  1759. static inline void arch_pick_mmap_layout(struct mm_struct *mm)
  1760. {
  1761. mm->mmap_base = TASK_UNMAPPED_BASE;
  1762. mm->get_unmapped_area = arch_get_unmapped_area;
  1763. mm->unmap_area = arch_unmap_area;
  1764. }
  1765. #endif
  1766. extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
  1767. extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
  1768. extern int sched_mc_power_savings, sched_smt_power_savings;
  1769. extern void normalize_rt_tasks(void);
  1770. #ifdef CONFIG_GROUP_SCHED
  1771. extern struct task_group init_task_group;
  1772. #ifdef CONFIG_USER_SCHED
  1773. extern struct task_group root_task_group;
  1774. #endif
  1775. extern struct task_group *sched_create_group(struct task_group *parent);
  1776. extern void sched_destroy_group(struct task_group *tg);
  1777. extern void sched_move_task(struct task_struct *tsk);
  1778. #ifdef CONFIG_FAIR_GROUP_SCHED
  1779. extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
  1780. extern unsigned long sched_group_shares(struct task_group *tg);
  1781. #endif
  1782. #ifdef CONFIG_RT_GROUP_SCHED
  1783. extern int sched_group_set_rt_runtime(struct task_group *tg,
  1784. long rt_runtime_us);
  1785. extern long sched_group_rt_runtime(struct task_group *tg);
  1786. extern int sched_group_set_rt_period(struct task_group *tg,
  1787. long rt_period_us);
  1788. extern long sched_group_rt_period(struct task_group *tg);
  1789. #endif
  1790. #endif
  1791. #ifdef CONFIG_TASK_XACCT
  1792. static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
  1793. {
  1794. tsk->rchar += amt;
  1795. }
  1796. static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
  1797. {
  1798. tsk->wchar += amt;
  1799. }
  1800. static inline void inc_syscr(struct task_struct *tsk)
  1801. {
  1802. tsk->syscr++;
  1803. }
  1804. static inline void inc_syscw(struct task_struct *tsk)
  1805. {
  1806. tsk->syscw++;
  1807. }
  1808. #else
  1809. static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
  1810. {
  1811. }
  1812. static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
  1813. {
  1814. }
  1815. static inline void inc_syscr(struct task_struct *tsk)
  1816. {
  1817. }
  1818. static inline void inc_syscw(struct task_struct *tsk)
  1819. {
  1820. }
  1821. #endif
  1822. #ifdef CONFIG_SMP
  1823. void migration_init(void);
  1824. #else
  1825. static inline void migration_init(void)
  1826. {
  1827. }
  1828. #endif
  1829. #ifndef TASK_SIZE_OF
  1830. #define TASK_SIZE_OF(tsk) TASK_SIZE
  1831. #endif
  1832. #ifdef CONFIG_MM_OWNER
  1833. extern void mm_update_next_owner(struct mm_struct *mm);
  1834. extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
  1835. #else
  1836. static inline void mm_update_next_owner(struct mm_struct *mm)
  1837. {
  1838. }
  1839. static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
  1840. {
  1841. }
  1842. #endif /* CONFIG_MM_OWNER */
  1843. #endif /* __KERNEL__ */
  1844. #endif