sched.h 55 KB

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  1. #ifndef _LINUX_SCHED_H
  2. #define _LINUX_SCHED_H
  3. #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
  4. /*
  5. * cloning flags:
  6. */
  7. #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
  8. #define CLONE_VM 0x00000100 /* set if VM shared between processes */
  9. #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
  10. #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
  11. #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
  12. #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
  13. #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
  14. #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
  15. #define CLONE_THREAD 0x00010000 /* Same thread group? */
  16. #define CLONE_NEWNS 0x00020000 /* New namespace group? */
  17. #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
  18. #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
  19. #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
  20. #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
  21. #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
  22. #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
  23. #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
  24. #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
  25. #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
  26. #define CLONE_NEWIPC 0x08000000 /* New ipcs */
  27. /*
  28. * Scheduling policies
  29. */
  30. #define SCHED_NORMAL 0
  31. #define SCHED_FIFO 1
  32. #define SCHED_RR 2
  33. #define SCHED_BATCH 3
  34. #define SCHED_ISO 4
  35. #define SCHED_IDLE 5
  36. #ifdef __KERNEL__
  37. #include <linux/rbtree.h> /* For run_node */
  38. struct sched_param {
  39. int sched_priority;
  40. };
  41. #include <asm/param.h> /* for HZ */
  42. #include <linux/capability.h>
  43. #include <linux/threads.h>
  44. #include <linux/kernel.h>
  45. #include <linux/types.h>
  46. #include <linux/timex.h>
  47. #include <linux/jiffies.h>
  48. #include <linux/rbtree.h>
  49. #include <linux/thread_info.h>
  50. #include <linux/cpumask.h>
  51. #include <linux/errno.h>
  52. #include <linux/nodemask.h>
  53. #include <asm/system.h>
  54. #include <asm/semaphore.h>
  55. #include <asm/page.h>
  56. #include <asm/ptrace.h>
  57. #include <asm/mmu.h>
  58. #include <asm/cputime.h>
  59. #include <linux/smp.h>
  60. #include <linux/sem.h>
  61. #include <linux/signal.h>
  62. #include <linux/securebits.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/seccomp.h>
  70. #include <linux/rcupdate.h>
  71. #include <linux/futex.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 <asm/processor.h>
  80. struct exec_domain;
  81. struct futex_pi_state;
  82. /*
  83. * List of flags we want to share for kernel threads,
  84. * if only because they are not used by them anyway.
  85. */
  86. #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
  87. /*
  88. * Define these - sched.c is from v2.6.22 but these constants
  89. * are not defined in earlier kernels.
  90. */
  91. #define CPU_DEAD_FROZEN 1000
  92. #define CPU_DOWN_FAILED_FROZEN 1001
  93. #define CPU_DOWN_PREPARE_FROZEN 1002
  94. #define CPU_LOCK_ACQUIRE 1003
  95. #define CPU_LOCK_RELEASE 1004
  96. #define CPU_ONLINE_FROZEN 1005
  97. #define CPU_UP_CANCELED_FROZEN 1006
  98. #define CPU_UP_PREPARE_FROZEN 1007
  99. /*
  100. * These are the constant used to fake the fixed-point load-average
  101. * counting. Some notes:
  102. * - 11 bit fractions expand to 22 bits by the multiplies: this gives
  103. * a load-average precision of 10 bits integer + 11 bits fractional
  104. * - if you want to count load-averages more often, you need more
  105. * precision, or rounding will get you. With 2-second counting freq,
  106. * the EXP_n values would be 1981, 2034 and 2043 if still using only
  107. * 11 bit fractions.
  108. */
  109. extern unsigned long avenrun[]; /* Load averages */
  110. #define FSHIFT 11 /* nr of bits of precision */
  111. #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
  112. #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
  113. #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
  114. #define EXP_5 2014 /* 1/exp(5sec/5min) */
  115. #define EXP_15 2037 /* 1/exp(5sec/15min) */
  116. #define CALC_LOAD(load,exp,n) \
  117. load *= exp; \
  118. load += n*(FIXED_1-exp); \
  119. load >>= FSHIFT;
  120. extern unsigned long total_forks;
  121. extern int nr_threads;
  122. DECLARE_PER_CPU(unsigned long, process_counts);
  123. extern int nr_processes(void);
  124. extern unsigned long nr_running(void);
  125. extern unsigned long nr_uninterruptible(void);
  126. extern unsigned long nr_active(void);
  127. extern unsigned long nr_iowait(void);
  128. extern unsigned long weighted_cpuload(const int cpu);
  129. struct seq_file;
  130. struct cfs_rq;
  131. #ifdef CONFIG_SCHED_DEBUG
  132. extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
  133. extern void proc_sched_set_task(struct task_struct *p);
  134. extern void
  135. print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq, u64 now);
  136. #else
  137. static inline void
  138. proc_sched_show_task(struct task_struct *p, struct seq_file *m)
  139. {
  140. }
  141. static inline void proc_sched_set_task(struct task_struct *p)
  142. {
  143. }
  144. static inline void
  145. print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq, u64 now)
  146. {
  147. }
  148. #endif
  149. /*
  150. * Task state bitmask. NOTE! These bits are also
  151. * encoded in fs/proc/array.c: get_task_state().
  152. *
  153. * We have two separate sets of flags: task->state
  154. * is about runnability, while task->exit_state are
  155. * about the task exiting. Confusing, but this way
  156. * modifying one set can't modify the other one by
  157. * mistake.
  158. */
  159. #define TASK_RUNNING 0
  160. #define TASK_INTERRUPTIBLE 1
  161. #define TASK_UNINTERRUPTIBLE 2
  162. #define TASK_STOPPED 4
  163. #define TASK_TRACED 8
  164. /* in tsk->exit_state */
  165. #define EXIT_ZOMBIE 16
  166. #define EXIT_DEAD 32
  167. /* in tsk->state again */
  168. #define TASK_NONINTERACTIVE 64
  169. #define TASK_DEAD 128
  170. #define __set_task_state(tsk, state_value) \
  171. do { (tsk)->state = (state_value); } while (0)
  172. #define set_task_state(tsk, state_value) \
  173. set_mb((tsk)->state, (state_value))
  174. /*
  175. * set_current_state() includes a barrier so that the write of current->state
  176. * is correctly serialised wrt the caller's subsequent test of whether to
  177. * actually sleep:
  178. *
  179. * set_current_state(TASK_UNINTERRUPTIBLE);
  180. * if (do_i_need_to_sleep())
  181. * schedule();
  182. *
  183. * If the caller does not need such serialisation then use __set_current_state()
  184. */
  185. #define __set_current_state(state_value) \
  186. do { current->state = (state_value); } while (0)
  187. #define set_current_state(state_value) \
  188. set_mb(current->state, (state_value))
  189. /* Task command name length */
  190. #define TASK_COMM_LEN 16
  191. #include <linux/spinlock.h>
  192. /*
  193. * This serializes "schedule()" and also protects
  194. * the run-queue from deletions/modifications (but
  195. * _adding_ to the beginning of the run-queue has
  196. * a separate lock).
  197. */
  198. extern rwlock_t tasklist_lock;
  199. extern spinlock_t mmlist_lock;
  200. struct task_struct;
  201. extern void sched_init(void);
  202. extern void sched_init_smp(void);
  203. extern void init_idle(struct task_struct *idle, int cpu);
  204. extern void init_idle_bootup_task(struct task_struct *idle);
  205. extern cpumask_t nohz_cpu_mask;
  206. #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
  207. extern int select_nohz_load_balancer(int cpu);
  208. #else
  209. static inline int select_nohz_load_balancer(int cpu)
  210. {
  211. return 0;
  212. }
  213. #endif
  214. /*
  215. * Only dump TASK_* tasks. (0 for all tasks)
  216. */
  217. extern void show_state_filter(unsigned long state_filter);
  218. static inline void show_state(void)
  219. {
  220. show_state_filter(0);
  221. }
  222. extern void show_regs(struct pt_regs *);
  223. /*
  224. * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
  225. * task), SP is the stack pointer of the first frame that should be shown in the back
  226. * trace (or NULL if the entire call-chain of the task should be shown).
  227. */
  228. extern void show_stack(struct task_struct *task, unsigned long *sp);
  229. void io_schedule(void);
  230. long io_schedule_timeout(long timeout);
  231. extern void cpu_init (void);
  232. extern void trap_init(void);
  233. extern void update_process_times(int user);
  234. extern void scheduler_tick(void);
  235. #ifdef CONFIG_DETECT_SOFTLOCKUP
  236. extern void softlockup_tick(void);
  237. extern void spawn_softlockup_task(void);
  238. extern void touch_softlockup_watchdog(void);
  239. extern void touch_all_softlockup_watchdogs(void);
  240. #else
  241. static inline void softlockup_tick(void)
  242. {
  243. }
  244. static inline void spawn_softlockup_task(void)
  245. {
  246. }
  247. static inline void touch_softlockup_watchdog(void)
  248. {
  249. }
  250. static inline void touch_all_softlockup_watchdogs(void)
  251. {
  252. }
  253. #endif
  254. /* Attach to any functions which should be ignored in wchan output. */
  255. #define __sched __attribute__((__section__(".sched.text")))
  256. /* Is this address in the __sched functions? */
  257. extern int in_sched_functions(unsigned long addr);
  258. #define MAX_SCHEDULE_TIMEOUT LONG_MAX
  259. extern signed long FASTCALL(schedule_timeout(signed long timeout));
  260. extern signed long schedule_timeout_interruptible(signed long timeout);
  261. extern signed long schedule_timeout_uninterruptible(signed long timeout);
  262. asmlinkage void schedule(void);
  263. struct nsproxy;
  264. /* Maximum number of active map areas.. This is a random (large) number */
  265. #define DEFAULT_MAX_MAP_COUNT 65536
  266. extern int sysctl_max_map_count;
  267. #include <linux/aio.h>
  268. extern unsigned long
  269. arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
  270. unsigned long, unsigned long);
  271. extern unsigned long
  272. arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
  273. unsigned long len, unsigned long pgoff,
  274. unsigned long flags);
  275. extern void arch_unmap_area(struct mm_struct *, unsigned long);
  276. extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
  277. #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
  278. /*
  279. * The mm counters are not protected by its page_table_lock,
  280. * so must be incremented atomically.
  281. */
  282. #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
  283. #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
  284. #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
  285. #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
  286. #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
  287. typedef atomic_long_t mm_counter_t;
  288. #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
  289. /*
  290. * The mm counters are protected by its page_table_lock,
  291. * so can be incremented directly.
  292. */
  293. #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
  294. #define get_mm_counter(mm, member) ((mm)->_##member)
  295. #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
  296. #define inc_mm_counter(mm, member) (mm)->_##member++
  297. #define dec_mm_counter(mm, member) (mm)->_##member--
  298. typedef unsigned long mm_counter_t;
  299. #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
  300. #define get_mm_rss(mm) \
  301. (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
  302. #define update_hiwater_rss(mm) do { \
  303. unsigned long _rss = get_mm_rss(mm); \
  304. if ((mm)->hiwater_rss < _rss) \
  305. (mm)->hiwater_rss = _rss; \
  306. } while (0)
  307. #define update_hiwater_vm(mm) do { \
  308. if ((mm)->hiwater_vm < (mm)->total_vm) \
  309. (mm)->hiwater_vm = (mm)->total_vm; \
  310. } while (0)
  311. struct mm_struct {
  312. struct vm_area_struct * mmap; /* list of VMAs */
  313. struct rb_root mm_rb;
  314. struct vm_area_struct * mmap_cache; /* last find_vma result */
  315. unsigned long (*get_unmapped_area) (struct file *filp,
  316. unsigned long addr, unsigned long len,
  317. unsigned long pgoff, unsigned long flags);
  318. void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
  319. unsigned long mmap_base; /* base of mmap area */
  320. unsigned long task_size; /* size of task vm space */
  321. unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
  322. unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
  323. pgd_t * pgd;
  324. atomic_t mm_users; /* How many users with user space? */
  325. atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
  326. int map_count; /* number of VMAs */
  327. struct rw_semaphore mmap_sem;
  328. spinlock_t page_table_lock; /* Protects page tables and some counters */
  329. struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
  330. * together off init_mm.mmlist, and are protected
  331. * by mmlist_lock
  332. */
  333. /* Special counters, in some configurations protected by the
  334. * page_table_lock, in other configurations by being atomic.
  335. */
  336. mm_counter_t _file_rss;
  337. mm_counter_t _anon_rss;
  338. unsigned long hiwater_rss; /* High-watermark of RSS usage */
  339. unsigned long hiwater_vm; /* High-water virtual memory usage */
  340. unsigned long total_vm, locked_vm, shared_vm, exec_vm;
  341. unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
  342. unsigned long start_code, end_code, start_data, end_data;
  343. unsigned long start_brk, brk, start_stack;
  344. unsigned long arg_start, arg_end, env_start, env_end;
  345. unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
  346. cpumask_t cpu_vm_mask;
  347. /* Architecture-specific MM context */
  348. mm_context_t context;
  349. /* Swap token stuff */
  350. /*
  351. * Last value of global fault stamp as seen by this process.
  352. * In other words, this value gives an indication of how long
  353. * it has been since this task got the token.
  354. * Look at mm/thrash.c
  355. */
  356. unsigned int faultstamp;
  357. unsigned int token_priority;
  358. unsigned int last_interval;
  359. unsigned char dumpable:2;
  360. /* coredumping support */
  361. int core_waiters;
  362. struct completion *core_startup_done, core_done;
  363. /* aio bits */
  364. rwlock_t ioctx_list_lock;
  365. struct kioctx *ioctx_list;
  366. };
  367. struct sighand_struct {
  368. atomic_t count;
  369. struct k_sigaction action[_NSIG];
  370. spinlock_t siglock;
  371. };
  372. struct pacct_struct {
  373. int ac_flag;
  374. long ac_exitcode;
  375. unsigned long ac_mem;
  376. cputime_t ac_utime, ac_stime;
  377. unsigned long ac_minflt, ac_majflt;
  378. };
  379. /*
  380. * NOTE! "signal_struct" does not have it's own
  381. * locking, because a shared signal_struct always
  382. * implies a shared sighand_struct, so locking
  383. * sighand_struct is always a proper superset of
  384. * the locking of signal_struct.
  385. */
  386. struct signal_struct {
  387. atomic_t count;
  388. atomic_t live;
  389. wait_queue_head_t wait_chldexit; /* for wait4() */
  390. /* current thread group signal load-balancing target: */
  391. struct task_struct *curr_target;
  392. /* shared signal handling: */
  393. struct sigpending shared_pending;
  394. /* thread group exit support */
  395. int group_exit_code;
  396. /* overloaded:
  397. * - notify group_exit_task when ->count is equal to notify_count
  398. * - everyone except group_exit_task is stopped during signal delivery
  399. * of fatal signals, group_exit_task processes the signal.
  400. */
  401. struct task_struct *group_exit_task;
  402. int notify_count;
  403. /* thread group stop support, overloads group_exit_code too */
  404. int group_stop_count;
  405. unsigned int flags; /* see SIGNAL_* flags below */
  406. /* POSIX.1b Interval Timers */
  407. struct list_head posix_timers;
  408. /* ITIMER_REAL timer for the process */
  409. struct hrtimer real_timer;
  410. struct task_struct *tsk;
  411. ktime_t it_real_incr;
  412. /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
  413. cputime_t it_prof_expires, it_virt_expires;
  414. cputime_t it_prof_incr, it_virt_incr;
  415. /* job control IDs */
  416. pid_t pgrp;
  417. struct pid *tty_old_pgrp;
  418. union {
  419. pid_t session __deprecated;
  420. pid_t __session;
  421. };
  422. /* boolean value for session group leader */
  423. int leader;
  424. struct tty_struct *tty; /* NULL if no tty */
  425. /*
  426. * Cumulative resource counters for dead threads in the group,
  427. * and for reaped dead child processes forked by this group.
  428. * Live threads maintain their own counters and add to these
  429. * in __exit_signal, except for the group leader.
  430. */
  431. cputime_t utime, stime, cutime, cstime;
  432. unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
  433. unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
  434. /*
  435. * Cumulative ns of scheduled CPU time for dead threads in the
  436. * group, not including a zombie group leader. (This only differs
  437. * from jiffies_to_ns(utime + stime) if sched_clock uses something
  438. * other than jiffies.)
  439. */
  440. unsigned long long sum_sched_runtime;
  441. /*
  442. * We don't bother to synchronize most readers of this at all,
  443. * because there is no reader checking a limit that actually needs
  444. * to get both rlim_cur and rlim_max atomically, and either one
  445. * alone is a single word that can safely be read normally.
  446. * getrlimit/setrlimit use task_lock(current->group_leader) to
  447. * protect this instead of the siglock, because they really
  448. * have no need to disable irqs.
  449. */
  450. struct rlimit rlim[RLIM_NLIMITS];
  451. struct list_head cpu_timers[3];
  452. /* keep the process-shared keyrings here so that they do the right
  453. * thing in threads created with CLONE_THREAD */
  454. #ifdef CONFIG_KEYS
  455. struct key *session_keyring; /* keyring inherited over fork */
  456. struct key *process_keyring; /* keyring private to this process */
  457. #endif
  458. #ifdef CONFIG_BSD_PROCESS_ACCT
  459. struct pacct_struct pacct; /* per-process accounting information */
  460. #endif
  461. #ifdef CONFIG_TASKSTATS
  462. struct taskstats *stats;
  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. * Some day this will be a full-fledged user tracking system..
  478. */
  479. struct user_struct {
  480. atomic_t __count; /* reference count */
  481. atomic_t processes; /* How many processes does this user have? */
  482. atomic_t files; /* How many open files does this user have? */
  483. atomic_t sigpending; /* How many pending signals does this user have? */
  484. #ifdef CONFIG_INOTIFY_USER
  485. atomic_t inotify_watches; /* How many inotify watches does this user have? */
  486. atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
  487. #endif
  488. /* protected by mq_lock */
  489. unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
  490. unsigned long locked_shm; /* How many pages of mlocked shm ? */
  491. #ifdef CONFIG_KEYS
  492. struct key *uid_keyring; /* UID specific keyring */
  493. struct key *session_keyring; /* UID's default session keyring */
  494. #endif
  495. /* Hash table maintenance information */
  496. struct list_head uidhash_list;
  497. uid_t uid;
  498. };
  499. extern struct user_struct *find_user(uid_t);
  500. extern struct user_struct root_user;
  501. #define INIT_USER (&root_user)
  502. struct backing_dev_info;
  503. struct reclaim_state;
  504. #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
  505. struct sched_info {
  506. /* cumulative counters */
  507. unsigned long pcnt; /* # of times run on this cpu */
  508. unsigned long long cpu_time, /* time spent on the cpu */
  509. run_delay; /* time spent waiting on a runqueue */
  510. /* timestamps */
  511. unsigned long long last_arrival,/* when we last ran on a cpu */
  512. last_queued; /* when we were last queued to run */
  513. };
  514. #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
  515. #ifdef CONFIG_SCHEDSTATS
  516. extern const struct file_operations proc_schedstat_operations;
  517. #endif /* CONFIG_SCHEDSTATS */
  518. #ifdef CONFIG_TASK_DELAY_ACCT
  519. struct task_delay_info {
  520. spinlock_t lock;
  521. unsigned int flags; /* Private per-task flags */
  522. /* For each stat XXX, add following, aligned appropriately
  523. *
  524. * struct timespec XXX_start, XXX_end;
  525. * u64 XXX_delay;
  526. * u32 XXX_count;
  527. *
  528. * Atomicity of updates to XXX_delay, XXX_count protected by
  529. * single lock above (split into XXX_lock if contention is an issue).
  530. */
  531. /*
  532. * XXX_count is incremented on every XXX operation, the delay
  533. * associated with the operation is added to XXX_delay.
  534. * XXX_delay contains the accumulated delay time in nanoseconds.
  535. */
  536. struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
  537. u64 blkio_delay; /* wait for sync block io completion */
  538. u64 swapin_delay; /* wait for swapin block io completion */
  539. u32 blkio_count; /* total count of the number of sync block */
  540. /* io operations performed */
  541. u32 swapin_count; /* total count of the number of swapin block */
  542. /* io operations performed */
  543. };
  544. #endif /* CONFIG_TASK_DELAY_ACCT */
  545. static inline int sched_info_on(void)
  546. {
  547. #ifdef CONFIG_SCHEDSTATS
  548. return 1;
  549. #elif defined(CONFIG_TASK_DELAY_ACCT)
  550. extern int delayacct_on;
  551. return delayacct_on;
  552. #else
  553. return 0;
  554. #endif
  555. }
  556. enum cpu_idle_type {
  557. CPU_IDLE,
  558. CPU_NOT_IDLE,
  559. CPU_NEWLY_IDLE,
  560. CPU_MAX_IDLE_TYPES
  561. };
  562. /*
  563. * sched-domains (multiprocessor balancing) declarations:
  564. */
  565. /*
  566. * Increase resolution of nice-level calculations:
  567. */
  568. #define SCHED_LOAD_SHIFT 10
  569. #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
  570. #define SCHED_LOAD_SCALE_FUZZ (SCHED_LOAD_SCALE >> 5)
  571. #ifdef CONFIG_SMP
  572. #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
  573. #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
  574. #define SD_BALANCE_EXEC 4 /* Balance on exec */
  575. #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
  576. #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
  577. #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
  578. #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
  579. #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
  580. #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
  581. #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
  582. #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
  583. #define BALANCE_FOR_MC_POWER \
  584. (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
  585. #define BALANCE_FOR_PKG_POWER \
  586. ((sched_mc_power_savings || sched_smt_power_savings) ? \
  587. SD_POWERSAVINGS_BALANCE : 0)
  588. #define test_sd_parent(sd, flag) ((sd->parent && \
  589. (sd->parent->flags & flag)) ? 1 : 0)
  590. struct sched_group {
  591. struct sched_group *next; /* Must be a circular list */
  592. cpumask_t cpumask;
  593. /*
  594. * CPU power of this group, SCHED_LOAD_SCALE being max power for a
  595. * single CPU. This is read only (except for setup, hotplug CPU).
  596. * Note : Never change cpu_power without recompute its reciprocal
  597. */
  598. unsigned int __cpu_power;
  599. /*
  600. * reciprocal value of cpu_power to avoid expensive divides
  601. * (see include/linux/reciprocal_div.h)
  602. */
  603. u32 reciprocal_cpu_power;
  604. };
  605. struct sched_domain {
  606. /* These fields must be setup */
  607. struct sched_domain *parent; /* top domain must be null terminated */
  608. struct sched_domain *child; /* bottom domain must be null terminated */
  609. struct sched_group *groups; /* the balancing groups of the domain */
  610. cpumask_t span; /* span of all CPUs in this domain */
  611. unsigned long min_interval; /* Minimum balance interval ms */
  612. unsigned long max_interval; /* Maximum balance interval ms */
  613. unsigned int busy_factor; /* less balancing by factor if busy */
  614. unsigned int imbalance_pct; /* No balance until over watermark */
  615. unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
  616. unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
  617. unsigned int busy_idx;
  618. unsigned int idle_idx;
  619. unsigned int newidle_idx;
  620. unsigned int wake_idx;
  621. unsigned int forkexec_idx;
  622. int flags; /* See SD_* */
  623. /* Runtime fields. */
  624. unsigned long last_balance; /* init to jiffies. units in jiffies */
  625. unsigned int balance_interval; /* initialise to 1. units in ms. */
  626. unsigned int nr_balance_failed; /* initialise to 0 */
  627. #ifdef CONFIG_SCHEDSTATS
  628. /* load_balance() stats */
  629. unsigned long lb_cnt[CPU_MAX_IDLE_TYPES];
  630. unsigned long lb_failed[CPU_MAX_IDLE_TYPES];
  631. unsigned long lb_balanced[CPU_MAX_IDLE_TYPES];
  632. unsigned long lb_imbalance[CPU_MAX_IDLE_TYPES];
  633. unsigned long lb_gained[CPU_MAX_IDLE_TYPES];
  634. unsigned long lb_hot_gained[CPU_MAX_IDLE_TYPES];
  635. unsigned long lb_nobusyg[CPU_MAX_IDLE_TYPES];
  636. unsigned long lb_nobusyq[CPU_MAX_IDLE_TYPES];
  637. /* Active load balancing */
  638. unsigned long alb_cnt;
  639. unsigned long alb_failed;
  640. unsigned long alb_pushed;
  641. /* SD_BALANCE_EXEC stats */
  642. unsigned long sbe_cnt;
  643. unsigned long sbe_balanced;
  644. unsigned long sbe_pushed;
  645. /* SD_BALANCE_FORK stats */
  646. unsigned long sbf_cnt;
  647. unsigned long sbf_balanced;
  648. unsigned long sbf_pushed;
  649. /* try_to_wake_up() stats */
  650. unsigned long ttwu_wake_remote;
  651. unsigned long ttwu_move_affine;
  652. unsigned long ttwu_move_balance;
  653. #endif
  654. };
  655. extern int partition_sched_domains(cpumask_t *partition1,
  656. cpumask_t *partition2);
  657. #endif /* CONFIG_SMP */
  658. struct io_context; /* See blkdev.h */
  659. struct cpuset;
  660. #define NGROUPS_SMALL 32
  661. #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
  662. struct group_info {
  663. int ngroups;
  664. atomic_t usage;
  665. gid_t small_block[NGROUPS_SMALL];
  666. int nblocks;
  667. gid_t *blocks[0];
  668. };
  669. /*
  670. * get_group_info() must be called with the owning task locked (via task_lock())
  671. * when task != current. The reason being that the vast majority of callers are
  672. * looking at current->group_info, which can not be changed except by the
  673. * current task. Changing current->group_info requires the task lock, too.
  674. */
  675. #define get_group_info(group_info) do { \
  676. atomic_inc(&(group_info)->usage); \
  677. } while (0)
  678. #define put_group_info(group_info) do { \
  679. if (atomic_dec_and_test(&(group_info)->usage)) \
  680. groups_free(group_info); \
  681. } while (0)
  682. extern struct group_info *groups_alloc(int gidsetsize);
  683. extern void groups_free(struct group_info *group_info);
  684. extern int set_current_groups(struct group_info *group_info);
  685. extern int groups_search(struct group_info *group_info, gid_t grp);
  686. /* access the groups "array" with this macro */
  687. #define GROUP_AT(gi, i) \
  688. ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
  689. #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
  690. extern void prefetch_stack(struct task_struct *t);
  691. #else
  692. static inline void prefetch_stack(struct task_struct *t) { }
  693. #endif
  694. struct audit_context; /* See audit.c */
  695. struct mempolicy;
  696. struct pipe_inode_info;
  697. struct uts_namespace;
  698. struct rq;
  699. struct sched_domain;
  700. struct sched_class {
  701. struct sched_class *next;
  702. void (*enqueue_task) (struct rq *rq, struct task_struct *p,
  703. int wakeup, u64 now);
  704. void (*dequeue_task) (struct rq *rq, struct task_struct *p,
  705. int sleep, u64 now);
  706. void (*yield_task) (struct rq *rq, struct task_struct *p);
  707. void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
  708. struct task_struct * (*pick_next_task) (struct rq *rq, u64 now);
  709. void (*put_prev_task) (struct rq *rq, struct task_struct *p, u64 now);
  710. int (*load_balance) (struct rq *this_rq, int this_cpu,
  711. struct rq *busiest,
  712. unsigned long max_nr_move, unsigned long max_load_move,
  713. struct sched_domain *sd, enum cpu_idle_type idle,
  714. int *all_pinned, unsigned long *total_load_moved);
  715. void (*set_curr_task) (struct rq *rq);
  716. void (*task_tick) (struct rq *rq, struct task_struct *p);
  717. void (*task_new) (struct rq *rq, struct task_struct *p);
  718. };
  719. struct load_weight {
  720. unsigned long weight, inv_weight;
  721. };
  722. /*
  723. * CFS stats for a schedulable entity (task, task-group etc)
  724. *
  725. * Current field usage histogram:
  726. *
  727. * 4 se->block_start
  728. * 4 se->run_node
  729. * 4 se->sleep_start
  730. * 4 se->sleep_start_fair
  731. * 6 se->load.weight
  732. * 7 se->delta_fair
  733. * 15 se->wait_runtime
  734. */
  735. struct sched_entity {
  736. long wait_runtime;
  737. unsigned long delta_fair_run;
  738. unsigned long delta_fair_sleep;
  739. unsigned long delta_exec;
  740. s64 fair_key;
  741. struct load_weight load; /* for load-balancing */
  742. struct rb_node run_node;
  743. unsigned int on_rq;
  744. u64 wait_start_fair;
  745. u64 wait_start;
  746. u64 exec_start;
  747. u64 sleep_start;
  748. u64 sleep_start_fair;
  749. u64 block_start;
  750. u64 sleep_max;
  751. u64 block_max;
  752. u64 exec_max;
  753. u64 wait_max;
  754. u64 last_ran;
  755. u64 sum_exec_runtime;
  756. s64 sum_wait_runtime;
  757. s64 sum_sleep_runtime;
  758. unsigned long wait_runtime_overruns;
  759. unsigned long wait_runtime_underruns;
  760. #ifdef CONFIG_FAIR_GROUP_SCHED
  761. struct sched_entity *parent;
  762. /* rq on which this entity is (to be) queued: */
  763. struct cfs_rq *cfs_rq;
  764. /* rq "owned" by this entity/group: */
  765. struct cfs_rq *my_q;
  766. #endif
  767. };
  768. struct task_struct {
  769. volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
  770. struct thread_info *thread_info;
  771. atomic_t usage;
  772. unsigned long flags; /* per process flags, defined below */
  773. unsigned long ptrace;
  774. int lock_depth; /* BKL lock depth */
  775. #ifdef CONFIG_SMP
  776. #ifdef __ARCH_WANT_UNLOCKED_CTXSW
  777. int oncpu;
  778. #endif
  779. #endif
  780. int prio, static_prio, normal_prio;
  781. struct list_head run_list;
  782. struct sched_entity se;
  783. unsigned short ioprio;
  784. #ifdef CONFIG_BLK_DEV_IO_TRACE
  785. unsigned int btrace_seq;
  786. #endif
  787. unsigned long policy;
  788. cpumask_t cpus_allowed;
  789. unsigned int time_slice;
  790. struct sched_class *sched_class;
  791. #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
  792. struct sched_info sched_info;
  793. #endif
  794. struct list_head tasks;
  795. /*
  796. * ptrace_list/ptrace_children forms the list of my children
  797. * that were stolen by a ptracer.
  798. */
  799. struct list_head ptrace_children;
  800. struct list_head ptrace_list;
  801. struct mm_struct *mm, *active_mm;
  802. /* task state */
  803. struct linux_binfmt *binfmt;
  804. long exit_state;
  805. int exit_code, exit_signal;
  806. int pdeath_signal; /* The signal sent when the parent dies */
  807. /* ??? */
  808. unsigned long personality;
  809. unsigned did_exec:1;
  810. pid_t pid;
  811. pid_t tgid;
  812. #ifdef CONFIG_CC_STACKPROTECTOR
  813. /* Canary value for the -fstack-protector gcc feature */
  814. unsigned long stack_canary;
  815. #endif
  816. /*
  817. * pointers to (original) parent process, youngest child, younger sibling,
  818. * older sibling, respectively. (p->father can be replaced with
  819. * p->parent->pid)
  820. */
  821. struct task_struct *real_parent; /* real parent process (when being debugged) */
  822. struct task_struct *parent; /* parent process */
  823. /*
  824. * children/sibling forms the list of my children plus the
  825. * tasks I'm ptracing.
  826. */
  827. struct list_head children; /* list of my children */
  828. struct list_head sibling; /* linkage in my parent's children list */
  829. struct task_struct *group_leader; /* threadgroup leader */
  830. /* PID/PID hash table linkage. */
  831. struct pid_link pids[PIDTYPE_MAX];
  832. struct list_head thread_group;
  833. struct completion *vfork_done; /* for vfork() */
  834. int __user *set_child_tid; /* CLONE_CHILD_SETTID */
  835. int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
  836. unsigned long rt_priority;
  837. cputime_t utime, stime;
  838. unsigned long nvcsw, nivcsw; /* context switch counts */
  839. struct timespec start_time;
  840. /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
  841. unsigned long min_flt, maj_flt;
  842. cputime_t it_prof_expires, it_virt_expires;
  843. unsigned long long it_sched_expires;
  844. struct list_head cpu_timers[3];
  845. /* process credentials */
  846. uid_t uid,euid,suid,fsuid;
  847. gid_t gid,egid,sgid,fsgid;
  848. struct group_info *group_info;
  849. kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
  850. unsigned keep_capabilities:1;
  851. struct user_struct *user;
  852. #ifdef CONFIG_KEYS
  853. struct key *request_key_auth; /* assumed request_key authority */
  854. struct key *thread_keyring; /* keyring private to this thread */
  855. unsigned char jit_keyring; /* default keyring to attach requested keys to */
  856. #endif
  857. /*
  858. * fpu_counter contains the number of consecutive context switches
  859. * that the FPU is used. If this is over a threshold, the lazy fpu
  860. * saving becomes unlazy to save the trap. This is an unsigned char
  861. * so that after 256 times the counter wraps and the behavior turns
  862. * lazy again; this to deal with bursty apps that only use FPU for
  863. * a short time
  864. */
  865. unsigned char fpu_counter;
  866. int oomkilladj; /* OOM kill score adjustment (bit shift). */
  867. char comm[TASK_COMM_LEN]; /* executable name excluding path
  868. - access with [gs]et_task_comm (which lock
  869. it with task_lock())
  870. - initialized normally by flush_old_exec */
  871. /* file system info */
  872. int link_count, total_link_count;
  873. #ifdef CONFIG_SYSVIPC
  874. /* ipc stuff */
  875. struct sysv_sem sysvsem;
  876. #endif
  877. /* CPU-specific state of this task */
  878. struct thread_struct thread;
  879. /* filesystem information */
  880. struct fs_struct *fs;
  881. /* open file information */
  882. struct files_struct *files;
  883. /* namespaces */
  884. struct nsproxy *nsproxy;
  885. /* signal handlers */
  886. struct signal_struct *signal;
  887. struct sighand_struct *sighand;
  888. sigset_t blocked, real_blocked;
  889. sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */
  890. struct sigpending pending;
  891. unsigned long sas_ss_sp;
  892. size_t sas_ss_size;
  893. int (*notifier)(void *priv);
  894. void *notifier_data;
  895. sigset_t *notifier_mask;
  896. void *security;
  897. struct audit_context *audit_context;
  898. seccomp_t seccomp;
  899. /* Thread group tracking */
  900. u32 parent_exec_id;
  901. u32 self_exec_id;
  902. /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
  903. spinlock_t alloc_lock;
  904. /* Protection of the PI data structures: */
  905. spinlock_t pi_lock;
  906. #ifdef CONFIG_RT_MUTEXES
  907. /* PI waiters blocked on a rt_mutex held by this task */
  908. struct plist_head pi_waiters;
  909. /* Deadlock detection and priority inheritance handling */
  910. struct rt_mutex_waiter *pi_blocked_on;
  911. #endif
  912. #ifdef CONFIG_DEBUG_MUTEXES
  913. /* mutex deadlock detection */
  914. struct mutex_waiter *blocked_on;
  915. #endif
  916. #ifdef CONFIG_TRACE_IRQFLAGS
  917. unsigned int irq_events;
  918. int hardirqs_enabled;
  919. unsigned long hardirq_enable_ip;
  920. unsigned int hardirq_enable_event;
  921. unsigned long hardirq_disable_ip;
  922. unsigned int hardirq_disable_event;
  923. int softirqs_enabled;
  924. unsigned long softirq_disable_ip;
  925. unsigned int softirq_disable_event;
  926. unsigned long softirq_enable_ip;
  927. unsigned int softirq_enable_event;
  928. int hardirq_context;
  929. int softirq_context;
  930. #endif
  931. #ifdef CONFIG_LOCKDEP
  932. # define MAX_LOCK_DEPTH 30UL
  933. u64 curr_chain_key;
  934. int lockdep_depth;
  935. struct held_lock held_locks[MAX_LOCK_DEPTH];
  936. unsigned int lockdep_recursion;
  937. #endif
  938. /* journalling filesystem info */
  939. void *journal_info;
  940. /* VM state */
  941. struct reclaim_state *reclaim_state;
  942. struct backing_dev_info *backing_dev_info;
  943. struct io_context *io_context;
  944. unsigned long ptrace_message;
  945. siginfo_t *last_siginfo; /* For ptrace use. */
  946. /*
  947. * current io wait handle: wait queue entry to use for io waits
  948. * If this thread is processing aio, this points at the waitqueue
  949. * inside the currently handled kiocb. It may be NULL (i.e. default
  950. * to a stack based synchronous wait) if its doing sync IO.
  951. */
  952. wait_queue_t *io_wait;
  953. #ifdef CONFIG_TASK_XACCT
  954. /* i/o counters(bytes read/written, #syscalls */
  955. u64 rchar, wchar, syscr, syscw;
  956. #endif
  957. struct task_io_accounting ioac;
  958. #if defined(CONFIG_TASK_XACCT)
  959. u64 acct_rss_mem1; /* accumulated rss usage */
  960. u64 acct_vm_mem1; /* accumulated virtual memory usage */
  961. cputime_t acct_stimexpd;/* stime since last update */
  962. #endif
  963. #ifdef CONFIG_NUMA
  964. struct mempolicy *mempolicy;
  965. short il_next;
  966. #endif
  967. #ifdef CONFIG_CPUSETS
  968. struct cpuset *cpuset;
  969. nodemask_t mems_allowed;
  970. int cpuset_mems_generation;
  971. int cpuset_mem_spread_rotor;
  972. #endif
  973. struct robust_list_head __user *robust_list;
  974. #ifdef CONFIG_COMPAT
  975. struct compat_robust_list_head __user *compat_robust_list;
  976. #endif
  977. struct list_head pi_state_list;
  978. struct futex_pi_state *pi_state_cache;
  979. atomic_t fs_excl; /* holding fs exclusive resources */
  980. struct rcu_head rcu;
  981. /*
  982. * cache last used pipe for splice
  983. */
  984. struct pipe_inode_info *splice_pipe;
  985. #ifdef CONFIG_TASK_DELAY_ACCT
  986. struct task_delay_info *delays;
  987. #endif
  988. #ifdef CONFIG_FAULT_INJECTION
  989. int make_it_fail;
  990. #endif
  991. };
  992. /*
  993. * Priority of a process goes from 0..MAX_PRIO-1, valid RT
  994. * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
  995. * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
  996. * values are inverted: lower p->prio value means higher priority.
  997. *
  998. * The MAX_USER_RT_PRIO value allows the actual maximum
  999. * RT priority to be separate from the value exported to
  1000. * user-space. This allows kernel threads to set their
  1001. * priority to a value higher than any user task. Note:
  1002. * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
  1003. */
  1004. #define MAX_USER_RT_PRIO 100
  1005. #define MAX_RT_PRIO MAX_USER_RT_PRIO
  1006. #define MAX_PRIO (MAX_RT_PRIO + 40)
  1007. #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
  1008. static inline int rt_prio(int prio)
  1009. {
  1010. if (unlikely(prio < MAX_RT_PRIO))
  1011. return 1;
  1012. return 0;
  1013. }
  1014. static inline int rt_task(struct task_struct *p)
  1015. {
  1016. return rt_prio(p->prio);
  1017. }
  1018. static inline pid_t process_group(struct task_struct *tsk)
  1019. {
  1020. return tsk->signal->pgrp;
  1021. }
  1022. static inline pid_t signal_session(struct signal_struct *sig)
  1023. {
  1024. return sig->__session;
  1025. }
  1026. static inline pid_t process_session(struct task_struct *tsk)
  1027. {
  1028. return signal_session(tsk->signal);
  1029. }
  1030. static inline void set_signal_session(struct signal_struct *sig, pid_t session)
  1031. {
  1032. sig->__session = session;
  1033. }
  1034. static inline struct pid *task_pid(struct task_struct *task)
  1035. {
  1036. return task->pids[PIDTYPE_PID].pid;
  1037. }
  1038. static inline struct pid *task_tgid(struct task_struct *task)
  1039. {
  1040. return task->group_leader->pids[PIDTYPE_PID].pid;
  1041. }
  1042. static inline struct pid *task_pgrp(struct task_struct *task)
  1043. {
  1044. return task->group_leader->pids[PIDTYPE_PGID].pid;
  1045. }
  1046. static inline struct pid *task_session(struct task_struct *task)
  1047. {
  1048. return task->group_leader->pids[PIDTYPE_SID].pid;
  1049. }
  1050. /**
  1051. * pid_alive - check that a task structure is not stale
  1052. * @p: Task structure to be checked.
  1053. *
  1054. * Test if a process is not yet dead (at most zombie state)
  1055. * If pid_alive fails, then pointers within the task structure
  1056. * can be stale and must not be dereferenced.
  1057. */
  1058. static inline int pid_alive(struct task_struct *p)
  1059. {
  1060. return p->pids[PIDTYPE_PID].pid != NULL;
  1061. }
  1062. /**
  1063. * is_init - check if a task structure is init
  1064. * @tsk: Task structure to be checked.
  1065. *
  1066. * Check if a task structure is the first user space task the kernel created.
  1067. */
  1068. static inline int is_init(struct task_struct *tsk)
  1069. {
  1070. return tsk->pid == 1;
  1071. }
  1072. extern struct pid *cad_pid;
  1073. extern void free_task(struct task_struct *tsk);
  1074. #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
  1075. extern void __put_task_struct(struct task_struct *t);
  1076. static inline void put_task_struct(struct task_struct *t)
  1077. {
  1078. if (atomic_dec_and_test(&t->usage))
  1079. __put_task_struct(t);
  1080. }
  1081. /*
  1082. * Per process flags
  1083. */
  1084. #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
  1085. /* Not implemented yet, only for 486*/
  1086. #define PF_STARTING 0x00000002 /* being created */
  1087. #define PF_EXITING 0x00000004 /* getting shut down */
  1088. #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
  1089. #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
  1090. #define PF_DUMPCORE 0x00000200 /* dumped core */
  1091. #define PF_SIGNALED 0x00000400 /* killed by a signal */
  1092. #define PF_MEMALLOC 0x00000800 /* Allocating memory */
  1093. #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
  1094. #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
  1095. #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
  1096. #define PF_FROZEN 0x00010000 /* frozen for system suspend */
  1097. #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
  1098. #define PF_KSWAPD 0x00040000 /* I am kswapd */
  1099. #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
  1100. #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
  1101. #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
  1102. #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
  1103. #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
  1104. #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
  1105. #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
  1106. #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
  1107. #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
  1108. /*
  1109. * Only the _current_ task can read/write to tsk->flags, but other
  1110. * tasks can access tsk->flags in readonly mode for example
  1111. * with tsk_used_math (like during threaded core dumping).
  1112. * There is however an exception to this rule during ptrace
  1113. * or during fork: the ptracer task is allowed to write to the
  1114. * child->flags of its traced child (same goes for fork, the parent
  1115. * can write to the child->flags), because we're guaranteed the
  1116. * child is not running and in turn not changing child->flags
  1117. * at the same time the parent does it.
  1118. */
  1119. #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
  1120. #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
  1121. #define clear_used_math() clear_stopped_child_used_math(current)
  1122. #define set_used_math() set_stopped_child_used_math(current)
  1123. #define conditional_stopped_child_used_math(condition, child) \
  1124. do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
  1125. #define conditional_used_math(condition) \
  1126. conditional_stopped_child_used_math(condition, current)
  1127. #define copy_to_stopped_child_used_math(child) \
  1128. do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
  1129. /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
  1130. #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
  1131. #define used_math() tsk_used_math(current)
  1132. #ifdef CONFIG_SMP
  1133. extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask);
  1134. #else
  1135. static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
  1136. {
  1137. if (!cpu_isset(0, new_mask))
  1138. return -EINVAL;
  1139. return 0;
  1140. }
  1141. #endif
  1142. extern unsigned long long sched_clock(void);
  1143. extern void sched_clock_unstable_event(void);
  1144. extern unsigned long long
  1145. task_sched_runtime(struct task_struct *task);
  1146. /* sched_exec is called by processes performing an exec */
  1147. #ifdef CONFIG_SMP
  1148. extern void sched_exec(void);
  1149. #else
  1150. #define sched_exec() {}
  1151. #endif
  1152. #ifdef CONFIG_HOTPLUG_CPU
  1153. extern void idle_task_exit(void);
  1154. #else
  1155. static inline void idle_task_exit(void) {}
  1156. #endif
  1157. extern void sched_idle_next(void);
  1158. extern char * sched_print_task_state(struct task_struct *p, char *buffer);
  1159. extern unsigned int sysctl_sched_granularity;
  1160. extern unsigned int sysctl_sched_wakeup_granularity;
  1161. extern unsigned int sysctl_sched_batch_wakeup_granularity;
  1162. extern unsigned int sysctl_sched_stat_granularity;
  1163. extern unsigned int sysctl_sched_runtime_limit;
  1164. extern unsigned int sysctl_sched_child_runs_first;
  1165. extern unsigned int sysctl_sched_features;
  1166. #ifdef CONFIG_RT_MUTEXES
  1167. extern int rt_mutex_getprio(struct task_struct *p);
  1168. extern void rt_mutex_setprio(struct task_struct *p, int prio);
  1169. extern void rt_mutex_adjust_pi(struct task_struct *p);
  1170. #else
  1171. static inline int rt_mutex_getprio(struct task_struct *p)
  1172. {
  1173. return p->normal_prio;
  1174. }
  1175. # define rt_mutex_adjust_pi(p) do { } while (0)
  1176. #endif
  1177. extern void set_user_nice(struct task_struct *p, long nice);
  1178. extern int task_prio(const struct task_struct *p);
  1179. extern int task_nice(const struct task_struct *p);
  1180. extern int can_nice(const struct task_struct *p, const int nice);
  1181. extern int task_curr(const struct task_struct *p);
  1182. extern int idle_cpu(int cpu);
  1183. extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
  1184. extern struct task_struct *idle_task(int cpu);
  1185. extern struct task_struct *curr_task(int cpu);
  1186. extern void set_curr_task(int cpu, struct task_struct *p);
  1187. void yield(void);
  1188. /*
  1189. * The default (Linux) execution domain.
  1190. */
  1191. extern struct exec_domain default_exec_domain;
  1192. union thread_union {
  1193. struct thread_info thread_info;
  1194. unsigned long stack[THREAD_SIZE/sizeof(long)];
  1195. };
  1196. #ifndef __HAVE_ARCH_KSTACK_END
  1197. static inline int kstack_end(void *addr)
  1198. {
  1199. /* Reliable end of stack detection:
  1200. * Some APM bios versions misalign the stack
  1201. */
  1202. return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
  1203. }
  1204. #endif
  1205. extern union thread_union init_thread_union;
  1206. extern struct task_struct init_task;
  1207. extern struct mm_struct init_mm;
  1208. #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
  1209. extern struct task_struct *find_task_by_pid_type(int type, int pid);
  1210. extern void __set_special_pids(pid_t session, pid_t pgrp);
  1211. /* per-UID process charging. */
  1212. extern struct user_struct * alloc_uid(uid_t);
  1213. static inline struct user_struct *get_uid(struct user_struct *u)
  1214. {
  1215. atomic_inc(&u->__count);
  1216. return u;
  1217. }
  1218. extern void free_uid(struct user_struct *);
  1219. extern void switch_uid(struct user_struct *);
  1220. #include <asm/current.h>
  1221. extern void do_timer(unsigned long ticks);
  1222. extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
  1223. extern int FASTCALL(wake_up_process(struct task_struct * tsk));
  1224. extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
  1225. unsigned long clone_flags));
  1226. #ifdef CONFIG_SMP
  1227. extern void kick_process(struct task_struct *tsk);
  1228. #else
  1229. static inline void kick_process(struct task_struct *tsk) { }
  1230. #endif
  1231. extern void sched_fork(struct task_struct * p, int clone_flags);
  1232. extern void sched_dead(struct task_struct * p);
  1233. extern int in_group_p(gid_t);
  1234. extern int in_egroup_p(gid_t);
  1235. extern void proc_caches_init(void);
  1236. extern void flush_signals(struct task_struct *);
  1237. extern void flush_signal_handlers(struct task_struct *, int force_default);
  1238. extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
  1239. static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
  1240. {
  1241. unsigned long flags;
  1242. int ret;
  1243. spin_lock_irqsave(&tsk->sighand->siglock, flags);
  1244. ret = dequeue_signal(tsk, mask, info);
  1245. spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
  1246. return ret;
  1247. }
  1248. extern void block_all_signals(int (*notifier)(void *priv), void *priv,
  1249. sigset_t *mask);
  1250. extern void unblock_all_signals(void);
  1251. extern void release_task(struct task_struct * p);
  1252. extern int send_sig_info(int, struct siginfo *, struct task_struct *);
  1253. extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
  1254. extern int force_sigsegv(int, struct task_struct *);
  1255. extern int force_sig_info(int, struct siginfo *, struct task_struct *);
  1256. extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
  1257. extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
  1258. extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
  1259. extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
  1260. extern int kill_pgrp(struct pid *pid, int sig, int priv);
  1261. extern int kill_pid(struct pid *pid, int sig, int priv);
  1262. extern int kill_proc_info(int, struct siginfo *, pid_t);
  1263. extern void do_notify_parent(struct task_struct *, int);
  1264. extern void force_sig(int, struct task_struct *);
  1265. extern void force_sig_specific(int, struct task_struct *);
  1266. extern int send_sig(int, struct task_struct *, int);
  1267. extern void zap_other_threads(struct task_struct *p);
  1268. extern int kill_proc(pid_t, int, int);
  1269. extern struct sigqueue *sigqueue_alloc(void);
  1270. extern void sigqueue_free(struct sigqueue *);
  1271. extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
  1272. extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
  1273. extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
  1274. extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
  1275. static inline int kill_cad_pid(int sig, int priv)
  1276. {
  1277. return kill_pid(cad_pid, sig, priv);
  1278. }
  1279. /* These can be the second arg to send_sig_info/send_group_sig_info. */
  1280. #define SEND_SIG_NOINFO ((struct siginfo *) 0)
  1281. #define SEND_SIG_PRIV ((struct siginfo *) 1)
  1282. #define SEND_SIG_FORCED ((struct siginfo *) 2)
  1283. static inline int is_si_special(const struct siginfo *info)
  1284. {
  1285. return info <= SEND_SIG_FORCED;
  1286. }
  1287. /* True if we are on the alternate signal stack. */
  1288. static inline int on_sig_stack(unsigned long sp)
  1289. {
  1290. return (sp - current->sas_ss_sp < current->sas_ss_size);
  1291. }
  1292. static inline int sas_ss_flags(unsigned long sp)
  1293. {
  1294. return (current->sas_ss_size == 0 ? SS_DISABLE
  1295. : on_sig_stack(sp) ? SS_ONSTACK : 0);
  1296. }
  1297. /*
  1298. * Routines for handling mm_structs
  1299. */
  1300. extern struct mm_struct * mm_alloc(void);
  1301. /* mmdrop drops the mm and the page tables */
  1302. extern void FASTCALL(__mmdrop(struct mm_struct *));
  1303. static inline void mmdrop(struct mm_struct * mm)
  1304. {
  1305. if (unlikely(atomic_dec_and_test(&mm->mm_count)))
  1306. __mmdrop(mm);
  1307. }
  1308. /* mmput gets rid of the mappings and all user-space */
  1309. extern void mmput(struct mm_struct *);
  1310. /* Grab a reference to a task's mm, if it is not already going away */
  1311. extern struct mm_struct *get_task_mm(struct task_struct *task);
  1312. /* Remove the current tasks stale references to the old mm_struct */
  1313. extern void mm_release(struct task_struct *, struct mm_struct *);
  1314. extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
  1315. extern void flush_thread(void);
  1316. extern void exit_thread(void);
  1317. extern void exit_files(struct task_struct *);
  1318. extern void __cleanup_signal(struct signal_struct *);
  1319. extern void __cleanup_sighand(struct sighand_struct *);
  1320. extern void exit_itimers(struct signal_struct *);
  1321. extern NORET_TYPE void do_group_exit(int);
  1322. extern void daemonize(const char *, ...);
  1323. extern int allow_signal(int);
  1324. extern int disallow_signal(int);
  1325. extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
  1326. extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
  1327. struct task_struct *fork_idle(int);
  1328. extern void set_task_comm(struct task_struct *tsk, char *from);
  1329. extern void get_task_comm(char *to, struct task_struct *tsk);
  1330. #ifdef CONFIG_SMP
  1331. extern void wait_task_inactive(struct task_struct * p);
  1332. #else
  1333. #define wait_task_inactive(p) do { } while (0)
  1334. #endif
  1335. #define remove_parent(p) list_del_init(&(p)->sibling)
  1336. #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
  1337. #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
  1338. #define for_each_process(p) \
  1339. for (p = &init_task ; (p = next_task(p)) != &init_task ; )
  1340. /*
  1341. * Careful: do_each_thread/while_each_thread is a double loop so
  1342. * 'break' will not work as expected - use goto instead.
  1343. */
  1344. #define do_each_thread(g, t) \
  1345. for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
  1346. #define while_each_thread(g, t) \
  1347. while ((t = next_thread(t)) != g)
  1348. /* de_thread depends on thread_group_leader not being a pid based check */
  1349. #define thread_group_leader(p) (p == p->group_leader)
  1350. /* Do to the insanities of de_thread it is possible for a process
  1351. * to have the pid of the thread group leader without actually being
  1352. * the thread group leader. For iteration through the pids in proc
  1353. * all we care about is that we have a task with the appropriate
  1354. * pid, we don't actually care if we have the right task.
  1355. */
  1356. static inline int has_group_leader_pid(struct task_struct *p)
  1357. {
  1358. return p->pid == p->tgid;
  1359. }
  1360. static inline struct task_struct *next_thread(const struct task_struct *p)
  1361. {
  1362. return list_entry(rcu_dereference(p->thread_group.next),
  1363. struct task_struct, thread_group);
  1364. }
  1365. static inline int thread_group_empty(struct task_struct *p)
  1366. {
  1367. return list_empty(&p->thread_group);
  1368. }
  1369. #define delay_group_leader(p) \
  1370. (thread_group_leader(p) && !thread_group_empty(p))
  1371. /*
  1372. * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
  1373. * subscriptions and synchronises with wait4(). Also used in procfs. Also
  1374. * pins the final release of task.io_context. Also protects ->cpuset.
  1375. *
  1376. * Nests both inside and outside of read_lock(&tasklist_lock).
  1377. * It must not be nested with write_lock_irq(&tasklist_lock),
  1378. * neither inside nor outside.
  1379. */
  1380. static inline void task_lock(struct task_struct *p)
  1381. {
  1382. spin_lock(&p->alloc_lock);
  1383. }
  1384. static inline void task_unlock(struct task_struct *p)
  1385. {
  1386. spin_unlock(&p->alloc_lock);
  1387. }
  1388. extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
  1389. unsigned long *flags);
  1390. static inline void unlock_task_sighand(struct task_struct *tsk,
  1391. unsigned long *flags)
  1392. {
  1393. spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
  1394. }
  1395. #ifndef __HAVE_THREAD_FUNCTIONS
  1396. #define task_thread_info(task) (task)->thread_info
  1397. #define task_stack_page(task) ((void*)((task)->thread_info))
  1398. static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
  1399. {
  1400. *task_thread_info(p) = *task_thread_info(org);
  1401. task_thread_info(p)->task = p;
  1402. }
  1403. static inline unsigned long *end_of_stack(struct task_struct *p)
  1404. {
  1405. return (unsigned long *)(p->thread_info + 1);
  1406. }
  1407. #endif
  1408. /* set thread flags in other task's structures
  1409. * - see asm/thread_info.h for TIF_xxxx flags available
  1410. */
  1411. static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
  1412. {
  1413. set_ti_thread_flag(task_thread_info(tsk), flag);
  1414. }
  1415. static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
  1416. {
  1417. clear_ti_thread_flag(task_thread_info(tsk), flag);
  1418. }
  1419. static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
  1420. {
  1421. return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
  1422. }
  1423. static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
  1424. {
  1425. return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
  1426. }
  1427. static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
  1428. {
  1429. return test_ti_thread_flag(task_thread_info(tsk), flag);
  1430. }
  1431. static inline void set_tsk_need_resched(struct task_struct *tsk)
  1432. {
  1433. set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
  1434. }
  1435. static inline void clear_tsk_need_resched(struct task_struct *tsk)
  1436. {
  1437. clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
  1438. }
  1439. static inline int signal_pending(struct task_struct *p)
  1440. {
  1441. return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
  1442. }
  1443. static inline int need_resched(void)
  1444. {
  1445. return unlikely(test_thread_flag(TIF_NEED_RESCHED));
  1446. }
  1447. /*
  1448. * cond_resched() and cond_resched_lock(): latency reduction via
  1449. * explicit rescheduling in places that are safe. The return
  1450. * value indicates whether a reschedule was done in fact.
  1451. * cond_resched_lock() will drop the spinlock before scheduling,
  1452. * cond_resched_softirq() will enable bhs before scheduling.
  1453. */
  1454. extern int cond_resched(void);
  1455. extern int cond_resched_lock(spinlock_t * lock);
  1456. extern int cond_resched_softirq(void);
  1457. /*
  1458. * Does a critical section need to be broken due to another
  1459. * task waiting?:
  1460. */
  1461. #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
  1462. # define need_lockbreak(lock) ((lock)->break_lock)
  1463. #else
  1464. # define need_lockbreak(lock) 0
  1465. #endif
  1466. /*
  1467. * Does a critical section need to be broken due to another
  1468. * task waiting or preemption being signalled:
  1469. */
  1470. static inline int lock_need_resched(spinlock_t *lock)
  1471. {
  1472. if (need_lockbreak(lock) || need_resched())
  1473. return 1;
  1474. return 0;
  1475. }
  1476. /* Reevaluate whether the task has signals pending delivery.
  1477. This is required every time the blocked sigset_t changes.
  1478. callers must hold sighand->siglock. */
  1479. extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
  1480. extern void recalc_sigpending(void);
  1481. extern void signal_wake_up(struct task_struct *t, int resume_stopped);
  1482. /*
  1483. * Wrappers for p->thread_info->cpu access. No-op on UP.
  1484. */
  1485. #ifdef CONFIG_SMP
  1486. static inline unsigned int task_cpu(const struct task_struct *p)
  1487. {
  1488. return task_thread_info(p)->cpu;
  1489. }
  1490. extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
  1491. #else
  1492. static inline unsigned int task_cpu(const struct task_struct *p)
  1493. {
  1494. return 0;
  1495. }
  1496. static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
  1497. {
  1498. }
  1499. static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
  1500. {
  1501. }
  1502. #endif /* CONFIG_SMP */
  1503. #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
  1504. extern void arch_pick_mmap_layout(struct mm_struct *mm);
  1505. #else
  1506. static inline void arch_pick_mmap_layout(struct mm_struct *mm)
  1507. {
  1508. mm->mmap_base = TASK_UNMAPPED_BASE;
  1509. mm->get_unmapped_area = arch_get_unmapped_area;
  1510. mm->unmap_area = arch_unmap_area;
  1511. }
  1512. #endif
  1513. extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
  1514. extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
  1515. #include <linux/sysdev.h>
  1516. extern int sched_mc_power_savings, sched_smt_power_savings;
  1517. extern struct sysdev_attribute attr_sched_mc_power_savings, attr_sched_smt_power_savings;
  1518. extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
  1519. extern void normalize_rt_tasks(void);
  1520. #ifdef CONFIG_TASK_XACCT
  1521. static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
  1522. {
  1523. tsk->rchar += amt;
  1524. }
  1525. static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
  1526. {
  1527. tsk->wchar += amt;
  1528. }
  1529. static inline void inc_syscr(struct task_struct *tsk)
  1530. {
  1531. tsk->syscr++;
  1532. }
  1533. static inline void inc_syscw(struct task_struct *tsk)
  1534. {
  1535. tsk->syscw++;
  1536. }
  1537. #else
  1538. static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
  1539. {
  1540. }
  1541. static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
  1542. {
  1543. }
  1544. static inline void inc_syscr(struct task_struct *tsk)
  1545. {
  1546. }
  1547. static inline void inc_syscw(struct task_struct *tsk)
  1548. {
  1549. }
  1550. #endif
  1551. #endif /* __KERNEL__ */
  1552. #endif