sched.h revision ec7dc8ac73e4a56ed03b673f026f08c0d547f597
1#ifndef _LINUX_SCHED_H 2#define _LINUX_SCHED_H 3 4/* 5 * cloning flags: 6 */ 7#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ 8#define CLONE_VM 0x00000100 /* set if VM shared between processes */ 9#define CLONE_FS 0x00000200 /* set if fs info shared between processes */ 10#define CLONE_FILES 0x00000400 /* set if open files shared between processes */ 11#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ 12#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ 13#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ 14#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ 15#define CLONE_THREAD 0x00010000 /* Same thread group? */ 16#define CLONE_NEWNS 0x00020000 /* New namespace group? */ 17#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ 18#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ 19#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ 20#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ 21#define CLONE_DETACHED 0x00400000 /* Unused, ignored */ 22#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ 23#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ 24#define CLONE_STOPPED 0x02000000 /* Start in stopped state */ 25#define CLONE_NEWUTS 0x04000000 /* New utsname group? */ 26#define CLONE_NEWIPC 0x08000000 /* New ipcs */ 27#define CLONE_NEWUSER 0x10000000 /* New user namespace */ 28#define CLONE_NEWPID 0x20000000 /* New pid namespace */ 29#define CLONE_NEWNET 0x40000000 /* New network namespace */ 30#define CLONE_IO 0x80000000 /* Clone io context */ 31 32/* 33 * Scheduling policies 34 */ 35#define SCHED_NORMAL 0 36#define SCHED_FIFO 1 37#define SCHED_RR 2 38#define SCHED_BATCH 3 39/* SCHED_ISO: reserved but not implemented yet */ 40#define SCHED_IDLE 5 41 42#ifdef __KERNEL__ 43 44struct sched_param { 45 int sched_priority; 46}; 47 48#include <asm/param.h> /* for HZ */ 49 50#include <linux/capability.h> 51#include <linux/threads.h> 52#include <linux/kernel.h> 53#include <linux/types.h> 54#include <linux/timex.h> 55#include <linux/jiffies.h> 56#include <linux/rbtree.h> 57#include <linux/thread_info.h> 58#include <linux/cpumask.h> 59#include <linux/errno.h> 60#include <linux/nodemask.h> 61#include <linux/mm_types.h> 62 63#include <asm/system.h> 64#include <asm/semaphore.h> 65#include <asm/page.h> 66#include <asm/ptrace.h> 67#include <asm/cputime.h> 68 69#include <linux/smp.h> 70#include <linux/sem.h> 71#include <linux/signal.h> 72#include <linux/securebits.h> 73#include <linux/fs_struct.h> 74#include <linux/compiler.h> 75#include <linux/completion.h> 76#include <linux/pid.h> 77#include <linux/percpu.h> 78#include <linux/topology.h> 79#include <linux/proportions.h> 80#include <linux/seccomp.h> 81#include <linux/rcupdate.h> 82#include <linux/rtmutex.h> 83 84#include <linux/time.h> 85#include <linux/param.h> 86#include <linux/resource.h> 87#include <linux/timer.h> 88#include <linux/hrtimer.h> 89#include <linux/task_io_accounting.h> 90#include <linux/kobject.h> 91#include <linux/latencytop.h> 92 93#include <asm/processor.h> 94 95struct mem_cgroup; 96struct exec_domain; 97struct futex_pi_state; 98struct robust_list_head; 99struct bio; 100 101/* 102 * List of flags we want to share for kernel threads, 103 * if only because they are not used by them anyway. 104 */ 105#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 106 107/* 108 * These are the constant used to fake the fixed-point load-average 109 * counting. Some notes: 110 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 111 * a load-average precision of 10 bits integer + 11 bits fractional 112 * - if you want to count load-averages more often, you need more 113 * precision, or rounding will get you. With 2-second counting freq, 114 * the EXP_n values would be 1981, 2034 and 2043 if still using only 115 * 11 bit fractions. 116 */ 117extern unsigned long avenrun[]; /* Load averages */ 118 119#define FSHIFT 11 /* nr of bits of precision */ 120#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 121#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ 122#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 123#define EXP_5 2014 /* 1/exp(5sec/5min) */ 124#define EXP_15 2037 /* 1/exp(5sec/15min) */ 125 126#define CALC_LOAD(load,exp,n) \ 127 load *= exp; \ 128 load += n*(FIXED_1-exp); \ 129 load >>= FSHIFT; 130 131extern unsigned long total_forks; 132extern int nr_threads; 133DECLARE_PER_CPU(unsigned long, process_counts); 134extern int nr_processes(void); 135extern unsigned long nr_running(void); 136extern unsigned long nr_uninterruptible(void); 137extern unsigned long nr_active(void); 138extern unsigned long nr_iowait(void); 139extern unsigned long weighted_cpuload(const int cpu); 140 141struct seq_file; 142struct cfs_rq; 143struct task_group; 144#ifdef CONFIG_SCHED_DEBUG 145extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 146extern void proc_sched_set_task(struct task_struct *p); 147extern void 148print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 149#else 150static inline void 151proc_sched_show_task(struct task_struct *p, struct seq_file *m) 152{ 153} 154static inline void proc_sched_set_task(struct task_struct *p) 155{ 156} 157static inline void 158print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 159{ 160} 161#endif 162 163/* 164 * Task state bitmask. NOTE! These bits are also 165 * encoded in fs/proc/array.c: get_task_state(). 166 * 167 * We have two separate sets of flags: task->state 168 * is about runnability, while task->exit_state are 169 * about the task exiting. Confusing, but this way 170 * modifying one set can't modify the other one by 171 * mistake. 172 */ 173#define TASK_RUNNING 0 174#define TASK_INTERRUPTIBLE 1 175#define TASK_UNINTERRUPTIBLE 2 176#define __TASK_STOPPED 4 177#define __TASK_TRACED 8 178/* in tsk->exit_state */ 179#define EXIT_ZOMBIE 16 180#define EXIT_DEAD 32 181/* in tsk->state again */ 182#define TASK_DEAD 64 183#define TASK_WAKEKILL 128 184 185/* Convenience macros for the sake of set_task_state */ 186#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) 187#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) 188#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) 189 190/* Convenience macros for the sake of wake_up */ 191#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 192#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) 193 194/* get_task_state() */ 195#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ 196 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ 197 __TASK_TRACED) 198 199#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) 200#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) 201#define task_is_stopped_or_traced(task) \ 202 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) 203#define task_contributes_to_load(task) \ 204 ((task->state & TASK_UNINTERRUPTIBLE) != 0) 205 206#define __set_task_state(tsk, state_value) \ 207 do { (tsk)->state = (state_value); } while (0) 208#define set_task_state(tsk, state_value) \ 209 set_mb((tsk)->state, (state_value)) 210 211/* 212 * set_current_state() includes a barrier so that the write of current->state 213 * is correctly serialised wrt the caller's subsequent test of whether to 214 * actually sleep: 215 * 216 * set_current_state(TASK_UNINTERRUPTIBLE); 217 * if (do_i_need_to_sleep()) 218 * schedule(); 219 * 220 * If the caller does not need such serialisation then use __set_current_state() 221 */ 222#define __set_current_state(state_value) \ 223 do { current->state = (state_value); } while (0) 224#define set_current_state(state_value) \ 225 set_mb(current->state, (state_value)) 226 227/* Task command name length */ 228#define TASK_COMM_LEN 16 229 230#include <linux/spinlock.h> 231 232/* 233 * This serializes "schedule()" and also protects 234 * the run-queue from deletions/modifications (but 235 * _adding_ to the beginning of the run-queue has 236 * a separate lock). 237 */ 238extern rwlock_t tasklist_lock; 239extern spinlock_t mmlist_lock; 240 241struct task_struct; 242 243extern void sched_init(void); 244extern void sched_init_smp(void); 245extern asmlinkage void schedule_tail(struct task_struct *prev); 246extern void init_idle(struct task_struct *idle, int cpu); 247extern void init_idle_bootup_task(struct task_struct *idle); 248 249extern cpumask_t nohz_cpu_mask; 250#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 251extern int select_nohz_load_balancer(int cpu); 252#else 253static inline int select_nohz_load_balancer(int cpu) 254{ 255 return 0; 256} 257#endif 258 259extern unsigned long rt_needs_cpu(int cpu); 260 261/* 262 * Only dump TASK_* tasks. (0 for all tasks) 263 */ 264extern void show_state_filter(unsigned long state_filter); 265 266static inline void show_state(void) 267{ 268 show_state_filter(0); 269} 270 271extern void show_regs(struct pt_regs *); 272 273/* 274 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 275 * task), SP is the stack pointer of the first frame that should be shown in the back 276 * trace (or NULL if the entire call-chain of the task should be shown). 277 */ 278extern void show_stack(struct task_struct *task, unsigned long *sp); 279 280void io_schedule(void); 281long io_schedule_timeout(long timeout); 282 283extern void cpu_init (void); 284extern void trap_init(void); 285extern void account_process_tick(struct task_struct *task, int user); 286extern void update_process_times(int user); 287extern void scheduler_tick(void); 288extern void hrtick_resched(void); 289 290extern void sched_show_task(struct task_struct *p); 291 292#ifdef CONFIG_DETECT_SOFTLOCKUP 293extern void softlockup_tick(void); 294extern void spawn_softlockup_task(void); 295extern void touch_softlockup_watchdog(void); 296extern void touch_all_softlockup_watchdogs(void); 297extern unsigned long softlockup_thresh; 298extern unsigned long sysctl_hung_task_check_count; 299extern unsigned long sysctl_hung_task_timeout_secs; 300extern unsigned long sysctl_hung_task_warnings; 301#else 302static inline void softlockup_tick(void) 303{ 304} 305static inline void spawn_softlockup_task(void) 306{ 307} 308static inline void touch_softlockup_watchdog(void) 309{ 310} 311static inline void touch_all_softlockup_watchdogs(void) 312{ 313} 314#endif 315 316 317/* Attach to any functions which should be ignored in wchan output. */ 318#define __sched __attribute__((__section__(".sched.text"))) 319 320/* Linker adds these: start and end of __sched functions */ 321extern char __sched_text_start[], __sched_text_end[]; 322 323/* Is this address in the __sched functions? */ 324extern int in_sched_functions(unsigned long addr); 325 326#define MAX_SCHEDULE_TIMEOUT LONG_MAX 327extern signed long schedule_timeout(signed long timeout); 328extern signed long schedule_timeout_interruptible(signed long timeout); 329extern signed long schedule_timeout_killable(signed long timeout); 330extern signed long schedule_timeout_uninterruptible(signed long timeout); 331asmlinkage void schedule(void); 332 333struct nsproxy; 334struct user_namespace; 335 336/* Maximum number of active map areas.. This is a random (large) number */ 337#define DEFAULT_MAX_MAP_COUNT 65536 338 339extern int sysctl_max_map_count; 340 341#include <linux/aio.h> 342 343extern unsigned long 344arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 345 unsigned long, unsigned long); 346extern unsigned long 347arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 348 unsigned long len, unsigned long pgoff, 349 unsigned long flags); 350extern void arch_unmap_area(struct mm_struct *, unsigned long); 351extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 352 353#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS 354/* 355 * The mm counters are not protected by its page_table_lock, 356 * so must be incremented atomically. 357 */ 358#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) 359#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) 360#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) 361#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) 362#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) 363 364#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 365/* 366 * The mm counters are protected by its page_table_lock, 367 * so can be incremented directly. 368 */ 369#define set_mm_counter(mm, member, value) (mm)->_##member = (value) 370#define get_mm_counter(mm, member) ((mm)->_##member) 371#define add_mm_counter(mm, member, value) (mm)->_##member += (value) 372#define inc_mm_counter(mm, member) (mm)->_##member++ 373#define dec_mm_counter(mm, member) (mm)->_##member-- 374 375#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 376 377#define get_mm_rss(mm) \ 378 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) 379#define update_hiwater_rss(mm) do { \ 380 unsigned long _rss = get_mm_rss(mm); \ 381 if ((mm)->hiwater_rss < _rss) \ 382 (mm)->hiwater_rss = _rss; \ 383} while (0) 384#define update_hiwater_vm(mm) do { \ 385 if ((mm)->hiwater_vm < (mm)->total_vm) \ 386 (mm)->hiwater_vm = (mm)->total_vm; \ 387} while (0) 388 389extern void set_dumpable(struct mm_struct *mm, int value); 390extern int get_dumpable(struct mm_struct *mm); 391 392/* mm flags */ 393/* dumpable bits */ 394#define MMF_DUMPABLE 0 /* core dump is permitted */ 395#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 396#define MMF_DUMPABLE_BITS 2 397 398/* coredump filter bits */ 399#define MMF_DUMP_ANON_PRIVATE 2 400#define MMF_DUMP_ANON_SHARED 3 401#define MMF_DUMP_MAPPED_PRIVATE 4 402#define MMF_DUMP_MAPPED_SHARED 5 403#define MMF_DUMP_ELF_HEADERS 6 404#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 405#define MMF_DUMP_FILTER_BITS 5 406#define MMF_DUMP_FILTER_MASK \ 407 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 408#define MMF_DUMP_FILTER_DEFAULT \ 409 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED)) 410 411struct sighand_struct { 412 atomic_t count; 413 struct k_sigaction action[_NSIG]; 414 spinlock_t siglock; 415 wait_queue_head_t signalfd_wqh; 416}; 417 418struct pacct_struct { 419 int ac_flag; 420 long ac_exitcode; 421 unsigned long ac_mem; 422 cputime_t ac_utime, ac_stime; 423 unsigned long ac_minflt, ac_majflt; 424}; 425 426/* 427 * NOTE! "signal_struct" does not have it's own 428 * locking, because a shared signal_struct always 429 * implies a shared sighand_struct, so locking 430 * sighand_struct is always a proper superset of 431 * the locking of signal_struct. 432 */ 433struct signal_struct { 434 atomic_t count; 435 atomic_t live; 436 437 wait_queue_head_t wait_chldexit; /* for wait4() */ 438 439 /* current thread group signal load-balancing target: */ 440 struct task_struct *curr_target; 441 442 /* shared signal handling: */ 443 struct sigpending shared_pending; 444 445 /* thread group exit support */ 446 int group_exit_code; 447 /* overloaded: 448 * - notify group_exit_task when ->count is equal to notify_count 449 * - everyone except group_exit_task is stopped during signal delivery 450 * of fatal signals, group_exit_task processes the signal. 451 */ 452 struct task_struct *group_exit_task; 453 int notify_count; 454 455 /* thread group stop support, overloads group_exit_code too */ 456 int group_stop_count; 457 unsigned int flags; /* see SIGNAL_* flags below */ 458 459 /* POSIX.1b Interval Timers */ 460 struct list_head posix_timers; 461 462 /* ITIMER_REAL timer for the process */ 463 struct hrtimer real_timer; 464 struct pid *leader_pid; 465 ktime_t it_real_incr; 466 467 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 468 cputime_t it_prof_expires, it_virt_expires; 469 cputime_t it_prof_incr, it_virt_incr; 470 471 /* job control IDs */ 472 473 /* 474 * pgrp and session fields are deprecated. 475 * use the task_session_Xnr and task_pgrp_Xnr routines below 476 */ 477 478 union { 479 pid_t pgrp __deprecated; 480 pid_t __pgrp; 481 }; 482 483 struct pid *tty_old_pgrp; 484 485 union { 486 pid_t session __deprecated; 487 pid_t __session; 488 }; 489 490 /* boolean value for session group leader */ 491 int leader; 492 493 struct tty_struct *tty; /* NULL if no tty */ 494 495 /* 496 * Cumulative resource counters for dead threads in the group, 497 * and for reaped dead child processes forked by this group. 498 * Live threads maintain their own counters and add to these 499 * in __exit_signal, except for the group leader. 500 */ 501 cputime_t utime, stime, cutime, cstime; 502 cputime_t gtime; 503 cputime_t cgtime; 504 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 505 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 506 unsigned long inblock, oublock, cinblock, coublock; 507 508 /* 509 * Cumulative ns of scheduled CPU time for dead threads in the 510 * group, not including a zombie group leader. (This only differs 511 * from jiffies_to_ns(utime + stime) if sched_clock uses something 512 * other than jiffies.) 513 */ 514 unsigned long long sum_sched_runtime; 515 516 /* 517 * We don't bother to synchronize most readers of this at all, 518 * because there is no reader checking a limit that actually needs 519 * to get both rlim_cur and rlim_max atomically, and either one 520 * alone is a single word that can safely be read normally. 521 * getrlimit/setrlimit use task_lock(current->group_leader) to 522 * protect this instead of the siglock, because they really 523 * have no need to disable irqs. 524 */ 525 struct rlimit rlim[RLIM_NLIMITS]; 526 527 struct list_head cpu_timers[3]; 528 529 /* keep the process-shared keyrings here so that they do the right 530 * thing in threads created with CLONE_THREAD */ 531#ifdef CONFIG_KEYS 532 struct key *session_keyring; /* keyring inherited over fork */ 533 struct key *process_keyring; /* keyring private to this process */ 534#endif 535#ifdef CONFIG_BSD_PROCESS_ACCT 536 struct pacct_struct pacct; /* per-process accounting information */ 537#endif 538#ifdef CONFIG_TASKSTATS 539 struct taskstats *stats; 540#endif 541#ifdef CONFIG_AUDIT 542 unsigned audit_tty; 543 struct tty_audit_buf *tty_audit_buf; 544#endif 545}; 546 547/* Context switch must be unlocked if interrupts are to be enabled */ 548#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 549# define __ARCH_WANT_UNLOCKED_CTXSW 550#endif 551 552/* 553 * Bits in flags field of signal_struct. 554 */ 555#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 556#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 557#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 558#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 559 560/* If true, all threads except ->group_exit_task have pending SIGKILL */ 561static inline int signal_group_exit(const struct signal_struct *sig) 562{ 563 return (sig->flags & SIGNAL_GROUP_EXIT) || 564 (sig->group_exit_task != NULL); 565} 566 567/* 568 * Some day this will be a full-fledged user tracking system.. 569 */ 570struct user_struct { 571 atomic_t __count; /* reference count */ 572 atomic_t processes; /* How many processes does this user have? */ 573 atomic_t files; /* How many open files does this user have? */ 574 atomic_t sigpending; /* How many pending signals does this user have? */ 575#ifdef CONFIG_INOTIFY_USER 576 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 577 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 578#endif 579#ifdef CONFIG_POSIX_MQUEUE 580 /* protected by mq_lock */ 581 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 582#endif 583 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 584 585#ifdef CONFIG_KEYS 586 struct key *uid_keyring; /* UID specific keyring */ 587 struct key *session_keyring; /* UID's default session keyring */ 588#endif 589 590 /* Hash table maintenance information */ 591 struct hlist_node uidhash_node; 592 uid_t uid; 593 594#ifdef CONFIG_USER_SCHED 595 struct task_group *tg; 596#ifdef CONFIG_SYSFS 597 struct kobject kobj; 598 struct work_struct work; 599#endif 600#endif 601}; 602 603extern int uids_sysfs_init(void); 604 605extern struct user_struct *find_user(uid_t); 606 607extern struct user_struct root_user; 608#define INIT_USER (&root_user) 609 610struct backing_dev_info; 611struct reclaim_state; 612 613#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 614struct sched_info { 615 /* cumulative counters */ 616 unsigned long pcount; /* # of times run on this cpu */ 617 unsigned long long cpu_time, /* time spent on the cpu */ 618 run_delay; /* time spent waiting on a runqueue */ 619 620 /* timestamps */ 621 unsigned long long last_arrival,/* when we last ran on a cpu */ 622 last_queued; /* when we were last queued to run */ 623#ifdef CONFIG_SCHEDSTATS 624 /* BKL stats */ 625 unsigned int bkl_count; 626#endif 627}; 628#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 629 630#ifdef CONFIG_SCHEDSTATS 631extern const struct file_operations proc_schedstat_operations; 632#endif /* CONFIG_SCHEDSTATS */ 633 634#ifdef CONFIG_TASK_DELAY_ACCT 635struct task_delay_info { 636 spinlock_t lock; 637 unsigned int flags; /* Private per-task flags */ 638 639 /* For each stat XXX, add following, aligned appropriately 640 * 641 * struct timespec XXX_start, XXX_end; 642 * u64 XXX_delay; 643 * u32 XXX_count; 644 * 645 * Atomicity of updates to XXX_delay, XXX_count protected by 646 * single lock above (split into XXX_lock if contention is an issue). 647 */ 648 649 /* 650 * XXX_count is incremented on every XXX operation, the delay 651 * associated with the operation is added to XXX_delay. 652 * XXX_delay contains the accumulated delay time in nanoseconds. 653 */ 654 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 655 u64 blkio_delay; /* wait for sync block io completion */ 656 u64 swapin_delay; /* wait for swapin block io completion */ 657 u32 blkio_count; /* total count of the number of sync block */ 658 /* io operations performed */ 659 u32 swapin_count; /* total count of the number of swapin block */ 660 /* io operations performed */ 661}; 662#endif /* CONFIG_TASK_DELAY_ACCT */ 663 664static inline int sched_info_on(void) 665{ 666#ifdef CONFIG_SCHEDSTATS 667 return 1; 668#elif defined(CONFIG_TASK_DELAY_ACCT) 669 extern int delayacct_on; 670 return delayacct_on; 671#else 672 return 0; 673#endif 674} 675 676enum cpu_idle_type { 677 CPU_IDLE, 678 CPU_NOT_IDLE, 679 CPU_NEWLY_IDLE, 680 CPU_MAX_IDLE_TYPES 681}; 682 683/* 684 * sched-domains (multiprocessor balancing) declarations: 685 */ 686 687/* 688 * Increase resolution of nice-level calculations: 689 */ 690#define SCHED_LOAD_SHIFT 10 691#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 692 693#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE 694 695#ifdef CONFIG_SMP 696#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 697#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 698#define SD_BALANCE_EXEC 4 /* Balance on exec */ 699#define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 700#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 701#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 702#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 703#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 704#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ 705#define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ 706#define SD_SERIALIZE 1024 /* Only a single load balancing instance */ 707 708#define BALANCE_FOR_MC_POWER \ 709 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0) 710 711#define BALANCE_FOR_PKG_POWER \ 712 ((sched_mc_power_savings || sched_smt_power_savings) ? \ 713 SD_POWERSAVINGS_BALANCE : 0) 714 715#define test_sd_parent(sd, flag) ((sd->parent && \ 716 (sd->parent->flags & flag)) ? 1 : 0) 717 718 719struct sched_group { 720 struct sched_group *next; /* Must be a circular list */ 721 cpumask_t cpumask; 722 723 /* 724 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 725 * single CPU. This is read only (except for setup, hotplug CPU). 726 * Note : Never change cpu_power without recompute its reciprocal 727 */ 728 unsigned int __cpu_power; 729 /* 730 * reciprocal value of cpu_power to avoid expensive divides 731 * (see include/linux/reciprocal_div.h) 732 */ 733 u32 reciprocal_cpu_power; 734}; 735 736struct sched_domain { 737 /* These fields must be setup */ 738 struct sched_domain *parent; /* top domain must be null terminated */ 739 struct sched_domain *child; /* bottom domain must be null terminated */ 740 struct sched_group *groups; /* the balancing groups of the domain */ 741 cpumask_t span; /* span of all CPUs in this domain */ 742 unsigned long min_interval; /* Minimum balance interval ms */ 743 unsigned long max_interval; /* Maximum balance interval ms */ 744 unsigned int busy_factor; /* less balancing by factor if busy */ 745 unsigned int imbalance_pct; /* No balance until over watermark */ 746 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 747 unsigned int busy_idx; 748 unsigned int idle_idx; 749 unsigned int newidle_idx; 750 unsigned int wake_idx; 751 unsigned int forkexec_idx; 752 int flags; /* See SD_* */ 753 754 /* Runtime fields. */ 755 unsigned long last_balance; /* init to jiffies. units in jiffies */ 756 unsigned int balance_interval; /* initialise to 1. units in ms. */ 757 unsigned int nr_balance_failed; /* initialise to 0 */ 758 759#ifdef CONFIG_SCHEDSTATS 760 /* load_balance() stats */ 761 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 762 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 763 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 764 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 765 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 766 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 767 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 768 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 769 770 /* Active load balancing */ 771 unsigned int alb_count; 772 unsigned int alb_failed; 773 unsigned int alb_pushed; 774 775 /* SD_BALANCE_EXEC stats */ 776 unsigned int sbe_count; 777 unsigned int sbe_balanced; 778 unsigned int sbe_pushed; 779 780 /* SD_BALANCE_FORK stats */ 781 unsigned int sbf_count; 782 unsigned int sbf_balanced; 783 unsigned int sbf_pushed; 784 785 /* try_to_wake_up() stats */ 786 unsigned int ttwu_wake_remote; 787 unsigned int ttwu_move_affine; 788 unsigned int ttwu_move_balance; 789#endif 790}; 791 792extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new); 793extern int arch_reinit_sched_domains(void); 794 795#endif /* CONFIG_SMP */ 796 797/* 798 * A runqueue laden with a single nice 0 task scores a weighted_cpuload of 799 * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a 800 * task of nice 0 or enough lower priority tasks to bring up the 801 * weighted_cpuload 802 */ 803static inline int above_background_load(void) 804{ 805 unsigned long cpu; 806 807 for_each_online_cpu(cpu) { 808 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE) 809 return 1; 810 } 811 return 0; 812} 813 814struct io_context; /* See blkdev.h */ 815#define NGROUPS_SMALL 32 816#define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t))) 817struct group_info { 818 int ngroups; 819 atomic_t usage; 820 gid_t small_block[NGROUPS_SMALL]; 821 int nblocks; 822 gid_t *blocks[0]; 823}; 824 825/* 826 * get_group_info() must be called with the owning task locked (via task_lock()) 827 * when task != current. The reason being that the vast majority of callers are 828 * looking at current->group_info, which can not be changed except by the 829 * current task. Changing current->group_info requires the task lock, too. 830 */ 831#define get_group_info(group_info) do { \ 832 atomic_inc(&(group_info)->usage); \ 833} while (0) 834 835#define put_group_info(group_info) do { \ 836 if (atomic_dec_and_test(&(group_info)->usage)) \ 837 groups_free(group_info); \ 838} while (0) 839 840extern struct group_info *groups_alloc(int gidsetsize); 841extern void groups_free(struct group_info *group_info); 842extern int set_current_groups(struct group_info *group_info); 843extern int groups_search(struct group_info *group_info, gid_t grp); 844/* access the groups "array" with this macro */ 845#define GROUP_AT(gi, i) \ 846 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) 847 848#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 849extern void prefetch_stack(struct task_struct *t); 850#else 851static inline void prefetch_stack(struct task_struct *t) { } 852#endif 853 854struct audit_context; /* See audit.c */ 855struct mempolicy; 856struct pipe_inode_info; 857struct uts_namespace; 858 859struct rq; 860struct sched_domain; 861 862struct sched_class { 863 const struct sched_class *next; 864 865 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); 866 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); 867 void (*yield_task) (struct rq *rq); 868 int (*select_task_rq)(struct task_struct *p, int sync); 869 870 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p); 871 872 struct task_struct * (*pick_next_task) (struct rq *rq); 873 void (*put_prev_task) (struct rq *rq, struct task_struct *p); 874 875#ifdef CONFIG_SMP 876 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, 877 struct rq *busiest, unsigned long max_load_move, 878 struct sched_domain *sd, enum cpu_idle_type idle, 879 int *all_pinned, int *this_best_prio); 880 881 int (*move_one_task) (struct rq *this_rq, int this_cpu, 882 struct rq *busiest, struct sched_domain *sd, 883 enum cpu_idle_type idle); 884 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); 885 void (*post_schedule) (struct rq *this_rq); 886 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task); 887#endif 888 889 void (*set_curr_task) (struct rq *rq); 890 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 891 void (*task_new) (struct rq *rq, struct task_struct *p); 892 void (*set_cpus_allowed)(struct task_struct *p, 893 const cpumask_t *newmask); 894 895 void (*join_domain)(struct rq *rq); 896 void (*leave_domain)(struct rq *rq); 897 898 void (*switched_from) (struct rq *this_rq, struct task_struct *task, 899 int running); 900 void (*switched_to) (struct rq *this_rq, struct task_struct *task, 901 int running); 902 void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 903 int oldprio, int running); 904 905#ifdef CONFIG_FAIR_GROUP_SCHED 906 void (*moved_group) (struct task_struct *p); 907#endif 908}; 909 910struct load_weight { 911 unsigned long weight, inv_weight; 912}; 913 914/* 915 * CFS stats for a schedulable entity (task, task-group etc) 916 * 917 * Current field usage histogram: 918 * 919 * 4 se->block_start 920 * 4 se->run_node 921 * 4 se->sleep_start 922 * 6 se->load.weight 923 */ 924struct sched_entity { 925 struct load_weight load; /* for load-balancing */ 926 struct rb_node run_node; 927 unsigned int on_rq; 928 929 u64 exec_start; 930 u64 sum_exec_runtime; 931 u64 vruntime; 932 u64 prev_sum_exec_runtime; 933 934 u64 last_wakeup; 935 u64 avg_overlap; 936 937#ifdef CONFIG_SCHEDSTATS 938 u64 wait_start; 939 u64 wait_max; 940 u64 wait_count; 941 u64 wait_sum; 942 943 u64 sleep_start; 944 u64 sleep_max; 945 s64 sum_sleep_runtime; 946 947 u64 block_start; 948 u64 block_max; 949 u64 exec_max; 950 u64 slice_max; 951 952 u64 nr_migrations; 953 u64 nr_migrations_cold; 954 u64 nr_failed_migrations_affine; 955 u64 nr_failed_migrations_running; 956 u64 nr_failed_migrations_hot; 957 u64 nr_forced_migrations; 958 u64 nr_forced2_migrations; 959 960 u64 nr_wakeups; 961 u64 nr_wakeups_sync; 962 u64 nr_wakeups_migrate; 963 u64 nr_wakeups_local; 964 u64 nr_wakeups_remote; 965 u64 nr_wakeups_affine; 966 u64 nr_wakeups_affine_attempts; 967 u64 nr_wakeups_passive; 968 u64 nr_wakeups_idle; 969#endif 970 971#ifdef CONFIG_FAIR_GROUP_SCHED 972 struct sched_entity *parent; 973 /* rq on which this entity is (to be) queued: */ 974 struct cfs_rq *cfs_rq; 975 /* rq "owned" by this entity/group: */ 976 struct cfs_rq *my_q; 977#endif 978}; 979 980struct sched_rt_entity { 981 struct list_head run_list; 982 unsigned int time_slice; 983 unsigned long timeout; 984 int nr_cpus_allowed; 985 986#ifdef CONFIG_RT_GROUP_SCHED 987 struct sched_rt_entity *parent; 988 /* rq on which this entity is (to be) queued: */ 989 struct rt_rq *rt_rq; 990 /* rq "owned" by this entity/group: */ 991 struct rt_rq *my_q; 992#endif 993}; 994 995struct task_struct { 996 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 997 void *stack; 998 atomic_t usage; 999 unsigned int flags; /* per process flags, defined below */ 1000 unsigned int ptrace; 1001 1002 int lock_depth; /* BKL lock depth */ 1003 1004#ifdef CONFIG_SMP 1005#ifdef __ARCH_WANT_UNLOCKED_CTXSW 1006 int oncpu; 1007#endif 1008#endif 1009 1010 int prio, static_prio, normal_prio; 1011 const struct sched_class *sched_class; 1012 struct sched_entity se; 1013 struct sched_rt_entity rt; 1014 1015#ifdef CONFIG_PREEMPT_NOTIFIERS 1016 /* list of struct preempt_notifier: */ 1017 struct hlist_head preempt_notifiers; 1018#endif 1019 1020 /* 1021 * fpu_counter contains the number of consecutive context switches 1022 * that the FPU is used. If this is over a threshold, the lazy fpu 1023 * saving becomes unlazy to save the trap. This is an unsigned char 1024 * so that after 256 times the counter wraps and the behavior turns 1025 * lazy again; this to deal with bursty apps that only use FPU for 1026 * a short time 1027 */ 1028 unsigned char fpu_counter; 1029 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ 1030#ifdef CONFIG_BLK_DEV_IO_TRACE 1031 unsigned int btrace_seq; 1032#endif 1033 1034 unsigned int policy; 1035 cpumask_t cpus_allowed; 1036 1037#ifdef CONFIG_PREEMPT_RCU 1038 int rcu_read_lock_nesting; 1039 int rcu_flipctr_idx; 1040#endif /* #ifdef CONFIG_PREEMPT_RCU */ 1041 1042#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 1043 struct sched_info sched_info; 1044#endif 1045 1046 struct list_head tasks; 1047 /* 1048 * ptrace_list/ptrace_children forms the list of my children 1049 * that were stolen by a ptracer. 1050 */ 1051 struct list_head ptrace_children; 1052 struct list_head ptrace_list; 1053 1054 struct mm_struct *mm, *active_mm; 1055 1056/* task state */ 1057 struct linux_binfmt *binfmt; 1058 int exit_state; 1059 int exit_code, exit_signal; 1060 int pdeath_signal; /* The signal sent when the parent dies */ 1061 /* ??? */ 1062 unsigned int personality; 1063 unsigned did_exec:1; 1064 pid_t pid; 1065 pid_t tgid; 1066 1067#ifdef CONFIG_CC_STACKPROTECTOR 1068 /* Canary value for the -fstack-protector gcc feature */ 1069 unsigned long stack_canary; 1070#endif 1071 /* 1072 * pointers to (original) parent process, youngest child, younger sibling, 1073 * older sibling, respectively. (p->father can be replaced with 1074 * p->parent->pid) 1075 */ 1076 struct task_struct *real_parent; /* real parent process (when being debugged) */ 1077 struct task_struct *parent; /* parent process */ 1078 /* 1079 * children/sibling forms the list of my children plus the 1080 * tasks I'm ptracing. 1081 */ 1082 struct list_head children; /* list of my children */ 1083 struct list_head sibling; /* linkage in my parent's children list */ 1084 struct task_struct *group_leader; /* threadgroup leader */ 1085 1086 /* PID/PID hash table linkage. */ 1087 struct pid_link pids[PIDTYPE_MAX]; 1088 struct list_head thread_group; 1089 1090 struct completion *vfork_done; /* for vfork() */ 1091 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1092 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1093 1094 unsigned int rt_priority; 1095 cputime_t utime, stime, utimescaled, stimescaled; 1096 cputime_t gtime; 1097 cputime_t prev_utime, prev_stime; 1098 unsigned long nvcsw, nivcsw; /* context switch counts */ 1099 struct timespec start_time; /* monotonic time */ 1100 struct timespec real_start_time; /* boot based time */ 1101/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1102 unsigned long min_flt, maj_flt; 1103 1104 cputime_t it_prof_expires, it_virt_expires; 1105 unsigned long long it_sched_expires; 1106 struct list_head cpu_timers[3]; 1107 1108/* process credentials */ 1109 uid_t uid,euid,suid,fsuid; 1110 gid_t gid,egid,sgid,fsgid; 1111 struct group_info *group_info; 1112 kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset; 1113 unsigned keep_capabilities:1; 1114 struct user_struct *user; 1115#ifdef CONFIG_KEYS 1116 struct key *request_key_auth; /* assumed request_key authority */ 1117 struct key *thread_keyring; /* keyring private to this thread */ 1118 unsigned char jit_keyring; /* default keyring to attach requested keys to */ 1119#endif 1120 char comm[TASK_COMM_LEN]; /* executable name excluding path 1121 - access with [gs]et_task_comm (which lock 1122 it with task_lock()) 1123 - initialized normally by flush_old_exec */ 1124/* file system info */ 1125 int link_count, total_link_count; 1126#ifdef CONFIG_SYSVIPC 1127/* ipc stuff */ 1128 struct sysv_sem sysvsem; 1129#endif 1130#ifdef CONFIG_DETECT_SOFTLOCKUP 1131/* hung task detection */ 1132 unsigned long last_switch_timestamp; 1133 unsigned long last_switch_count; 1134#endif 1135/* CPU-specific state of this task */ 1136 struct thread_struct thread; 1137/* filesystem information */ 1138 struct fs_struct *fs; 1139/* open file information */ 1140 struct files_struct *files; 1141/* namespaces */ 1142 struct nsproxy *nsproxy; 1143/* signal handlers */ 1144 struct signal_struct *signal; 1145 struct sighand_struct *sighand; 1146 1147 sigset_t blocked, real_blocked; 1148 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */ 1149 struct sigpending pending; 1150 1151 unsigned long sas_ss_sp; 1152 size_t sas_ss_size; 1153 int (*notifier)(void *priv); 1154 void *notifier_data; 1155 sigset_t *notifier_mask; 1156#ifdef CONFIG_SECURITY 1157 void *security; 1158#endif 1159 struct audit_context *audit_context; 1160#ifdef CONFIG_AUDITSYSCALL 1161 uid_t loginuid; 1162 unsigned int sessionid; 1163#endif 1164 seccomp_t seccomp; 1165 1166/* Thread group tracking */ 1167 u32 parent_exec_id; 1168 u32 self_exec_id; 1169/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 1170 spinlock_t alloc_lock; 1171 1172 /* Protection of the PI data structures: */ 1173 spinlock_t pi_lock; 1174 1175#ifdef CONFIG_RT_MUTEXES 1176 /* PI waiters blocked on a rt_mutex held by this task */ 1177 struct plist_head pi_waiters; 1178 /* Deadlock detection and priority inheritance handling */ 1179 struct rt_mutex_waiter *pi_blocked_on; 1180#endif 1181 1182#ifdef CONFIG_DEBUG_MUTEXES 1183 /* mutex deadlock detection */ 1184 struct mutex_waiter *blocked_on; 1185#endif 1186#ifdef CONFIG_TRACE_IRQFLAGS 1187 unsigned int irq_events; 1188 int hardirqs_enabled; 1189 unsigned long hardirq_enable_ip; 1190 unsigned int hardirq_enable_event; 1191 unsigned long hardirq_disable_ip; 1192 unsigned int hardirq_disable_event; 1193 int softirqs_enabled; 1194 unsigned long softirq_disable_ip; 1195 unsigned int softirq_disable_event; 1196 unsigned long softirq_enable_ip; 1197 unsigned int softirq_enable_event; 1198 int hardirq_context; 1199 int softirq_context; 1200#endif 1201#ifdef CONFIG_LOCKDEP 1202# define MAX_LOCK_DEPTH 48UL 1203 u64 curr_chain_key; 1204 int lockdep_depth; 1205 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1206 unsigned int lockdep_recursion; 1207#endif 1208 1209/* journalling filesystem info */ 1210 void *journal_info; 1211 1212/* stacked block device info */ 1213 struct bio *bio_list, **bio_tail; 1214 1215/* VM state */ 1216 struct reclaim_state *reclaim_state; 1217 1218 struct backing_dev_info *backing_dev_info; 1219 1220 struct io_context *io_context; 1221 1222 unsigned long ptrace_message; 1223 siginfo_t *last_siginfo; /* For ptrace use. */ 1224#ifdef CONFIG_TASK_XACCT 1225/* i/o counters(bytes read/written, #syscalls */ 1226 u64 rchar, wchar, syscr, syscw; 1227#endif 1228 struct task_io_accounting ioac; 1229#if defined(CONFIG_TASK_XACCT) 1230 u64 acct_rss_mem1; /* accumulated rss usage */ 1231 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1232 cputime_t acct_stimexpd;/* stime since last update */ 1233#endif 1234#ifdef CONFIG_NUMA 1235 struct mempolicy *mempolicy; 1236 short il_next; 1237#endif 1238#ifdef CONFIG_CPUSETS 1239 nodemask_t mems_allowed; 1240 int cpuset_mems_generation; 1241 int cpuset_mem_spread_rotor; 1242#endif 1243#ifdef CONFIG_CGROUPS 1244 /* Control Group info protected by css_set_lock */ 1245 struct css_set *cgroups; 1246 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1247 struct list_head cg_list; 1248#endif 1249#ifdef CONFIG_FUTEX 1250 struct robust_list_head __user *robust_list; 1251#ifdef CONFIG_COMPAT 1252 struct compat_robust_list_head __user *compat_robust_list; 1253#endif 1254 struct list_head pi_state_list; 1255 struct futex_pi_state *pi_state_cache; 1256#endif 1257 atomic_t fs_excl; /* holding fs exclusive resources */ 1258 struct rcu_head rcu; 1259 1260 /* 1261 * cache last used pipe for splice 1262 */ 1263 struct pipe_inode_info *splice_pipe; 1264#ifdef CONFIG_TASK_DELAY_ACCT 1265 struct task_delay_info *delays; 1266#endif 1267#ifdef CONFIG_FAULT_INJECTION 1268 int make_it_fail; 1269#endif 1270 struct prop_local_single dirties; 1271#ifdef CONFIG_LATENCYTOP 1272 int latency_record_count; 1273 struct latency_record latency_record[LT_SAVECOUNT]; 1274#endif 1275}; 1276 1277/* 1278 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1279 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1280 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1281 * values are inverted: lower p->prio value means higher priority. 1282 * 1283 * The MAX_USER_RT_PRIO value allows the actual maximum 1284 * RT priority to be separate from the value exported to 1285 * user-space. This allows kernel threads to set their 1286 * priority to a value higher than any user task. Note: 1287 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1288 */ 1289 1290#define MAX_USER_RT_PRIO 100 1291#define MAX_RT_PRIO MAX_USER_RT_PRIO 1292 1293#define MAX_PRIO (MAX_RT_PRIO + 40) 1294#define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1295 1296static inline int rt_prio(int prio) 1297{ 1298 if (unlikely(prio < MAX_RT_PRIO)) 1299 return 1; 1300 return 0; 1301} 1302 1303static inline int rt_task(struct task_struct *p) 1304{ 1305 return rt_prio(p->prio); 1306} 1307 1308static inline void set_task_session(struct task_struct *tsk, pid_t session) 1309{ 1310 tsk->signal->__session = session; 1311} 1312 1313static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp) 1314{ 1315 tsk->signal->__pgrp = pgrp; 1316} 1317 1318static inline struct pid *task_pid(struct task_struct *task) 1319{ 1320 return task->pids[PIDTYPE_PID].pid; 1321} 1322 1323static inline struct pid *task_tgid(struct task_struct *task) 1324{ 1325 return task->group_leader->pids[PIDTYPE_PID].pid; 1326} 1327 1328static inline struct pid *task_pgrp(struct task_struct *task) 1329{ 1330 return task->group_leader->pids[PIDTYPE_PGID].pid; 1331} 1332 1333static inline struct pid *task_session(struct task_struct *task) 1334{ 1335 return task->group_leader->pids[PIDTYPE_SID].pid; 1336} 1337 1338struct pid_namespace; 1339 1340/* 1341 * the helpers to get the task's different pids as they are seen 1342 * from various namespaces 1343 * 1344 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1345 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 1346 * current. 1347 * task_xid_nr_ns() : id seen from the ns specified; 1348 * 1349 * set_task_vxid() : assigns a virtual id to a task; 1350 * 1351 * see also pid_nr() etc in include/linux/pid.h 1352 */ 1353 1354static inline pid_t task_pid_nr(struct task_struct *tsk) 1355{ 1356 return tsk->pid; 1357} 1358 1359pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1360 1361static inline pid_t task_pid_vnr(struct task_struct *tsk) 1362{ 1363 return pid_vnr(task_pid(tsk)); 1364} 1365 1366 1367static inline pid_t task_tgid_nr(struct task_struct *tsk) 1368{ 1369 return tsk->tgid; 1370} 1371 1372pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1373 1374static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1375{ 1376 return pid_vnr(task_tgid(tsk)); 1377} 1378 1379 1380static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1381{ 1382 return tsk->signal->__pgrp; 1383} 1384 1385pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1386 1387static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1388{ 1389 return pid_vnr(task_pgrp(tsk)); 1390} 1391 1392 1393static inline pid_t task_session_nr(struct task_struct *tsk) 1394{ 1395 return tsk->signal->__session; 1396} 1397 1398pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1399 1400static inline pid_t task_session_vnr(struct task_struct *tsk) 1401{ 1402 return pid_vnr(task_session(tsk)); 1403} 1404 1405 1406/** 1407 * pid_alive - check that a task structure is not stale 1408 * @p: Task structure to be checked. 1409 * 1410 * Test if a process is not yet dead (at most zombie state) 1411 * If pid_alive fails, then pointers within the task structure 1412 * can be stale and must not be dereferenced. 1413 */ 1414static inline int pid_alive(struct task_struct *p) 1415{ 1416 return p->pids[PIDTYPE_PID].pid != NULL; 1417} 1418 1419/** 1420 * is_global_init - check if a task structure is init 1421 * @tsk: Task structure to be checked. 1422 * 1423 * Check if a task structure is the first user space task the kernel created. 1424 */ 1425static inline int is_global_init(struct task_struct *tsk) 1426{ 1427 return tsk->pid == 1; 1428} 1429 1430/* 1431 * is_container_init: 1432 * check whether in the task is init in its own pid namespace. 1433 */ 1434extern int is_container_init(struct task_struct *tsk); 1435 1436extern struct pid *cad_pid; 1437 1438extern void free_task(struct task_struct *tsk); 1439#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1440 1441extern void __put_task_struct(struct task_struct *t); 1442 1443static inline void put_task_struct(struct task_struct *t) 1444{ 1445 if (atomic_dec_and_test(&t->usage)) 1446 __put_task_struct(t); 1447} 1448 1449/* 1450 * Per process flags 1451 */ 1452#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 1453 /* Not implemented yet, only for 486*/ 1454#define PF_STARTING 0x00000002 /* being created */ 1455#define PF_EXITING 0x00000004 /* getting shut down */ 1456#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1457#define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1458#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1459#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1460#define PF_DUMPCORE 0x00000200 /* dumped core */ 1461#define PF_SIGNALED 0x00000400 /* killed by a signal */ 1462#define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1463#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 1464#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1465#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1466#define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1467#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1468#define PF_KSWAPD 0x00040000 /* I am kswapd */ 1469#define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 1470#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1471#define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */ 1472#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1473#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1474#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1475#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1476#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1477#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1478#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1479 1480/* 1481 * Only the _current_ task can read/write to tsk->flags, but other 1482 * tasks can access tsk->flags in readonly mode for example 1483 * with tsk_used_math (like during threaded core dumping). 1484 * There is however an exception to this rule during ptrace 1485 * or during fork: the ptracer task is allowed to write to the 1486 * child->flags of its traced child (same goes for fork, the parent 1487 * can write to the child->flags), because we're guaranteed the 1488 * child is not running and in turn not changing child->flags 1489 * at the same time the parent does it. 1490 */ 1491#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1492#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1493#define clear_used_math() clear_stopped_child_used_math(current) 1494#define set_used_math() set_stopped_child_used_math(current) 1495#define conditional_stopped_child_used_math(condition, child) \ 1496 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1497#define conditional_used_math(condition) \ 1498 conditional_stopped_child_used_math(condition, current) 1499#define copy_to_stopped_child_used_math(child) \ 1500 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1501/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1502#define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1503#define used_math() tsk_used_math(current) 1504 1505#ifdef CONFIG_SMP 1506extern int set_cpus_allowed_ptr(struct task_struct *p, 1507 const cpumask_t *new_mask); 1508#else 1509static inline int set_cpus_allowed_ptr(struct task_struct *p, 1510 const cpumask_t *new_mask) 1511{ 1512 if (!cpu_isset(0, *new_mask)) 1513 return -EINVAL; 1514 return 0; 1515} 1516#endif 1517static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1518{ 1519 return set_cpus_allowed_ptr(p, &new_mask); 1520} 1521 1522extern unsigned long long sched_clock(void); 1523 1524/* 1525 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1526 * clock constructed from sched_clock(): 1527 */ 1528extern unsigned long long cpu_clock(int cpu); 1529 1530extern unsigned long long 1531task_sched_runtime(struct task_struct *task); 1532 1533/* sched_exec is called by processes performing an exec */ 1534#ifdef CONFIG_SMP 1535extern void sched_exec(void); 1536#else 1537#define sched_exec() {} 1538#endif 1539 1540extern void sched_clock_idle_sleep_event(void); 1541extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1542 1543#ifdef CONFIG_HOTPLUG_CPU 1544extern void idle_task_exit(void); 1545#else 1546static inline void idle_task_exit(void) {} 1547#endif 1548 1549extern void sched_idle_next(void); 1550 1551#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) 1552extern void wake_up_idle_cpu(int cpu); 1553#else 1554static inline void wake_up_idle_cpu(int cpu) { } 1555#endif 1556 1557#ifdef CONFIG_SCHED_DEBUG 1558extern unsigned int sysctl_sched_latency; 1559extern unsigned int sysctl_sched_min_granularity; 1560extern unsigned int sysctl_sched_wakeup_granularity; 1561extern unsigned int sysctl_sched_child_runs_first; 1562extern unsigned int sysctl_sched_features; 1563extern unsigned int sysctl_sched_migration_cost; 1564extern unsigned int sysctl_sched_nr_migrate; 1565 1566int sched_nr_latency_handler(struct ctl_table *table, int write, 1567 struct file *file, void __user *buffer, size_t *length, 1568 loff_t *ppos); 1569#endif 1570extern unsigned int sysctl_sched_rt_period; 1571extern int sysctl_sched_rt_runtime; 1572 1573int sched_rt_handler(struct ctl_table *table, int write, 1574 struct file *filp, void __user *buffer, size_t *lenp, 1575 loff_t *ppos); 1576 1577extern unsigned int sysctl_sched_compat_yield; 1578 1579#ifdef CONFIG_RT_MUTEXES 1580extern int rt_mutex_getprio(struct task_struct *p); 1581extern void rt_mutex_setprio(struct task_struct *p, int prio); 1582extern void rt_mutex_adjust_pi(struct task_struct *p); 1583#else 1584static inline int rt_mutex_getprio(struct task_struct *p) 1585{ 1586 return p->normal_prio; 1587} 1588# define rt_mutex_adjust_pi(p) do { } while (0) 1589#endif 1590 1591extern void set_user_nice(struct task_struct *p, long nice); 1592extern int task_prio(const struct task_struct *p); 1593extern int task_nice(const struct task_struct *p); 1594extern int can_nice(const struct task_struct *p, const int nice); 1595extern int task_curr(const struct task_struct *p); 1596extern int idle_cpu(int cpu); 1597extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1598extern struct task_struct *idle_task(int cpu); 1599extern struct task_struct *curr_task(int cpu); 1600extern void set_curr_task(int cpu, struct task_struct *p); 1601 1602void yield(void); 1603 1604/* 1605 * The default (Linux) execution domain. 1606 */ 1607extern struct exec_domain default_exec_domain; 1608 1609union thread_union { 1610 struct thread_info thread_info; 1611 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1612}; 1613 1614#ifndef __HAVE_ARCH_KSTACK_END 1615static inline int kstack_end(void *addr) 1616{ 1617 /* Reliable end of stack detection: 1618 * Some APM bios versions misalign the stack 1619 */ 1620 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1621} 1622#endif 1623 1624extern union thread_union init_thread_union; 1625extern struct task_struct init_task; 1626 1627extern struct mm_struct init_mm; 1628 1629extern struct pid_namespace init_pid_ns; 1630 1631/* 1632 * find a task by one of its numerical ids 1633 * 1634 * find_task_by_pid_type_ns(): 1635 * it is the most generic call - it finds a task by all id, 1636 * type and namespace specified 1637 * find_task_by_pid_ns(): 1638 * finds a task by its pid in the specified namespace 1639 * find_task_by_vpid(): 1640 * finds a task by its virtual pid 1641 * find_task_by_pid(): 1642 * finds a task by its global pid 1643 * 1644 * see also find_pid() etc in include/linux/pid.h 1645 */ 1646 1647extern struct task_struct *find_task_by_pid_type_ns(int type, int pid, 1648 struct pid_namespace *ns); 1649 1650extern struct task_struct *find_task_by_pid(pid_t nr); 1651extern struct task_struct *find_task_by_vpid(pid_t nr); 1652extern struct task_struct *find_task_by_pid_ns(pid_t nr, 1653 struct pid_namespace *ns); 1654 1655extern void __set_special_pids(struct pid *pid); 1656 1657/* per-UID process charging. */ 1658extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 1659static inline struct user_struct *get_uid(struct user_struct *u) 1660{ 1661 atomic_inc(&u->__count); 1662 return u; 1663} 1664extern void free_uid(struct user_struct *); 1665extern void switch_uid(struct user_struct *); 1666extern void release_uids(struct user_namespace *ns); 1667 1668#include <asm/current.h> 1669 1670extern void do_timer(unsigned long ticks); 1671 1672extern int wake_up_state(struct task_struct *tsk, unsigned int state); 1673extern int wake_up_process(struct task_struct *tsk); 1674extern void wake_up_new_task(struct task_struct *tsk, 1675 unsigned long clone_flags); 1676#ifdef CONFIG_SMP 1677 extern void kick_process(struct task_struct *tsk); 1678#else 1679 static inline void kick_process(struct task_struct *tsk) { } 1680#endif 1681extern void sched_fork(struct task_struct *p, int clone_flags); 1682extern void sched_dead(struct task_struct *p); 1683 1684extern int in_group_p(gid_t); 1685extern int in_egroup_p(gid_t); 1686 1687extern void proc_caches_init(void); 1688extern void flush_signals(struct task_struct *); 1689extern void ignore_signals(struct task_struct *); 1690extern void flush_signal_handlers(struct task_struct *, int force_default); 1691extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 1692 1693static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 1694{ 1695 unsigned long flags; 1696 int ret; 1697 1698 spin_lock_irqsave(&tsk->sighand->siglock, flags); 1699 ret = dequeue_signal(tsk, mask, info); 1700 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 1701 1702 return ret; 1703} 1704 1705extern void block_all_signals(int (*notifier)(void *priv), void *priv, 1706 sigset_t *mask); 1707extern void unblock_all_signals(void); 1708extern void release_task(struct task_struct * p); 1709extern int send_sig_info(int, struct siginfo *, struct task_struct *); 1710extern int force_sigsegv(int, struct task_struct *); 1711extern int force_sig_info(int, struct siginfo *, struct task_struct *); 1712extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1713extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 1714extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 1715extern int kill_pgrp(struct pid *pid, int sig, int priv); 1716extern int kill_pid(struct pid *pid, int sig, int priv); 1717extern int kill_proc_info(int, struct siginfo *, pid_t); 1718extern void do_notify_parent(struct task_struct *, int); 1719extern void force_sig(int, struct task_struct *); 1720extern void force_sig_specific(int, struct task_struct *); 1721extern int send_sig(int, struct task_struct *, int); 1722extern void zap_other_threads(struct task_struct *p); 1723extern int kill_proc(pid_t, int, int); 1724extern struct sigqueue *sigqueue_alloc(void); 1725extern void sigqueue_free(struct sigqueue *); 1726extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); 1727extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); 1728extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 1729extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 1730 1731static inline int kill_cad_pid(int sig, int priv) 1732{ 1733 return kill_pid(cad_pid, sig, priv); 1734} 1735 1736/* These can be the second arg to send_sig_info/send_group_sig_info. */ 1737#define SEND_SIG_NOINFO ((struct siginfo *) 0) 1738#define SEND_SIG_PRIV ((struct siginfo *) 1) 1739#define SEND_SIG_FORCED ((struct siginfo *) 2) 1740 1741static inline int is_si_special(const struct siginfo *info) 1742{ 1743 return info <= SEND_SIG_FORCED; 1744} 1745 1746/* True if we are on the alternate signal stack. */ 1747 1748static inline int on_sig_stack(unsigned long sp) 1749{ 1750 return (sp - current->sas_ss_sp < current->sas_ss_size); 1751} 1752 1753static inline int sas_ss_flags(unsigned long sp) 1754{ 1755 return (current->sas_ss_size == 0 ? SS_DISABLE 1756 : on_sig_stack(sp) ? SS_ONSTACK : 0); 1757} 1758 1759/* 1760 * Routines for handling mm_structs 1761 */ 1762extern struct mm_struct * mm_alloc(void); 1763 1764/* mmdrop drops the mm and the page tables */ 1765extern void __mmdrop(struct mm_struct *); 1766static inline void mmdrop(struct mm_struct * mm) 1767{ 1768 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 1769 __mmdrop(mm); 1770} 1771 1772/* mmput gets rid of the mappings and all user-space */ 1773extern void mmput(struct mm_struct *); 1774/* Grab a reference to a task's mm, if it is not already going away */ 1775extern struct mm_struct *get_task_mm(struct task_struct *task); 1776/* Remove the current tasks stale references to the old mm_struct */ 1777extern void mm_release(struct task_struct *, struct mm_struct *); 1778 1779extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 1780extern void flush_thread(void); 1781extern void exit_thread(void); 1782 1783extern void exit_files(struct task_struct *); 1784extern void __cleanup_signal(struct signal_struct *); 1785extern void __cleanup_sighand(struct sighand_struct *); 1786extern void exit_itimers(struct signal_struct *); 1787 1788extern NORET_TYPE void do_group_exit(int); 1789 1790extern void daemonize(const char *, ...); 1791extern int allow_signal(int); 1792extern int disallow_signal(int); 1793 1794extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 1795extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 1796struct task_struct *fork_idle(int); 1797 1798extern void set_task_comm(struct task_struct *tsk, char *from); 1799extern char *get_task_comm(char *to, struct task_struct *tsk); 1800 1801#ifdef CONFIG_SMP 1802extern void wait_task_inactive(struct task_struct * p); 1803#else 1804#define wait_task_inactive(p) do { } while (0) 1805#endif 1806 1807#define remove_parent(p) list_del_init(&(p)->sibling) 1808#define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children) 1809 1810#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) 1811 1812#define for_each_process(p) \ 1813 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 1814 1815/* 1816 * Careful: do_each_thread/while_each_thread is a double loop so 1817 * 'break' will not work as expected - use goto instead. 1818 */ 1819#define do_each_thread(g, t) \ 1820 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 1821 1822#define while_each_thread(g, t) \ 1823 while ((t = next_thread(t)) != g) 1824 1825/* de_thread depends on thread_group_leader not being a pid based check */ 1826#define thread_group_leader(p) (p == p->group_leader) 1827 1828/* Do to the insanities of de_thread it is possible for a process 1829 * to have the pid of the thread group leader without actually being 1830 * the thread group leader. For iteration through the pids in proc 1831 * all we care about is that we have a task with the appropriate 1832 * pid, we don't actually care if we have the right task. 1833 */ 1834static inline int has_group_leader_pid(struct task_struct *p) 1835{ 1836 return p->pid == p->tgid; 1837} 1838 1839static inline 1840int same_thread_group(struct task_struct *p1, struct task_struct *p2) 1841{ 1842 return p1->tgid == p2->tgid; 1843} 1844 1845static inline struct task_struct *next_thread(const struct task_struct *p) 1846{ 1847 return list_entry(rcu_dereference(p->thread_group.next), 1848 struct task_struct, thread_group); 1849} 1850 1851static inline int thread_group_empty(struct task_struct *p) 1852{ 1853 return list_empty(&p->thread_group); 1854} 1855 1856#define delay_group_leader(p) \ 1857 (thread_group_leader(p) && !thread_group_empty(p)) 1858 1859/* 1860 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 1861 * subscriptions and synchronises with wait4(). Also used in procfs. Also 1862 * pins the final release of task.io_context. Also protects ->cpuset and 1863 * ->cgroup.subsys[]. 1864 * 1865 * Nests both inside and outside of read_lock(&tasklist_lock). 1866 * It must not be nested with write_lock_irq(&tasklist_lock), 1867 * neither inside nor outside. 1868 */ 1869static inline void task_lock(struct task_struct *p) 1870{ 1871 spin_lock(&p->alloc_lock); 1872} 1873 1874static inline void task_unlock(struct task_struct *p) 1875{ 1876 spin_unlock(&p->alloc_lock); 1877} 1878 1879extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 1880 unsigned long *flags); 1881 1882static inline void unlock_task_sighand(struct task_struct *tsk, 1883 unsigned long *flags) 1884{ 1885 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 1886} 1887 1888#ifndef __HAVE_THREAD_FUNCTIONS 1889 1890#define task_thread_info(task) ((struct thread_info *)(task)->stack) 1891#define task_stack_page(task) ((task)->stack) 1892 1893static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 1894{ 1895 *task_thread_info(p) = *task_thread_info(org); 1896 task_thread_info(p)->task = p; 1897} 1898 1899static inline unsigned long *end_of_stack(struct task_struct *p) 1900{ 1901 return (unsigned long *)(task_thread_info(p) + 1); 1902} 1903 1904#endif 1905 1906/* set thread flags in other task's structures 1907 * - see asm/thread_info.h for TIF_xxxx flags available 1908 */ 1909static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 1910{ 1911 set_ti_thread_flag(task_thread_info(tsk), flag); 1912} 1913 1914static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1915{ 1916 clear_ti_thread_flag(task_thread_info(tsk), flag); 1917} 1918 1919static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 1920{ 1921 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 1922} 1923 1924static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1925{ 1926 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 1927} 1928 1929static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 1930{ 1931 return test_ti_thread_flag(task_thread_info(tsk), flag); 1932} 1933 1934static inline void set_tsk_need_resched(struct task_struct *tsk) 1935{ 1936 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1937} 1938 1939static inline void clear_tsk_need_resched(struct task_struct *tsk) 1940{ 1941 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1942} 1943 1944static inline int signal_pending(struct task_struct *p) 1945{ 1946 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 1947} 1948 1949extern int __fatal_signal_pending(struct task_struct *p); 1950 1951static inline int fatal_signal_pending(struct task_struct *p) 1952{ 1953 return signal_pending(p) && __fatal_signal_pending(p); 1954} 1955 1956static inline int need_resched(void) 1957{ 1958 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 1959} 1960 1961/* 1962 * cond_resched() and cond_resched_lock(): latency reduction via 1963 * explicit rescheduling in places that are safe. The return 1964 * value indicates whether a reschedule was done in fact. 1965 * cond_resched_lock() will drop the spinlock before scheduling, 1966 * cond_resched_softirq() will enable bhs before scheduling. 1967 */ 1968#ifdef CONFIG_PREEMPT 1969static inline int cond_resched(void) 1970{ 1971 return 0; 1972} 1973#else 1974extern int _cond_resched(void); 1975static inline int cond_resched(void) 1976{ 1977 return _cond_resched(); 1978} 1979#endif 1980extern int cond_resched_lock(spinlock_t * lock); 1981extern int cond_resched_softirq(void); 1982 1983/* 1984 * Does a critical section need to be broken due to another 1985 * task waiting?: (technically does not depend on CONFIG_PREEMPT, 1986 * but a general need for low latency) 1987 */ 1988static inline int spin_needbreak(spinlock_t *lock) 1989{ 1990#ifdef CONFIG_PREEMPT 1991 return spin_is_contended(lock); 1992#else 1993 return 0; 1994#endif 1995} 1996 1997/* 1998 * Reevaluate whether the task has signals pending delivery. 1999 * Wake the task if so. 2000 * This is required every time the blocked sigset_t changes. 2001 * callers must hold sighand->siglock. 2002 */ 2003extern void recalc_sigpending_and_wake(struct task_struct *t); 2004extern void recalc_sigpending(void); 2005 2006extern void signal_wake_up(struct task_struct *t, int resume_stopped); 2007 2008/* 2009 * Wrappers for p->thread_info->cpu access. No-op on UP. 2010 */ 2011#ifdef CONFIG_SMP 2012 2013static inline unsigned int task_cpu(const struct task_struct *p) 2014{ 2015 return task_thread_info(p)->cpu; 2016} 2017 2018extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 2019 2020#else 2021 2022static inline unsigned int task_cpu(const struct task_struct *p) 2023{ 2024 return 0; 2025} 2026 2027static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 2028{ 2029} 2030 2031#endif /* CONFIG_SMP */ 2032 2033#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 2034extern void arch_pick_mmap_layout(struct mm_struct *mm); 2035#else 2036static inline void arch_pick_mmap_layout(struct mm_struct *mm) 2037{ 2038 mm->mmap_base = TASK_UNMAPPED_BASE; 2039 mm->get_unmapped_area = arch_get_unmapped_area; 2040 mm->unmap_area = arch_unmap_area; 2041} 2042#endif 2043 2044extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask); 2045extern long sched_getaffinity(pid_t pid, cpumask_t *mask); 2046 2047extern int sched_mc_power_savings, sched_smt_power_savings; 2048 2049extern void normalize_rt_tasks(void); 2050 2051#ifdef CONFIG_GROUP_SCHED 2052 2053extern struct task_group init_task_group; 2054 2055extern struct task_group *sched_create_group(struct task_group *parent); 2056extern void sched_destroy_group(struct task_group *tg); 2057extern void sched_move_task(struct task_struct *tsk); 2058#ifdef CONFIG_FAIR_GROUP_SCHED 2059extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 2060extern unsigned long sched_group_shares(struct task_group *tg); 2061#endif 2062#ifdef CONFIG_RT_GROUP_SCHED 2063extern int sched_group_set_rt_runtime(struct task_group *tg, 2064 long rt_runtime_us); 2065extern long sched_group_rt_runtime(struct task_group *tg); 2066extern int sched_group_set_rt_period(struct task_group *tg, 2067 long rt_period_us); 2068extern long sched_group_rt_period(struct task_group *tg); 2069#endif 2070#endif 2071 2072#ifdef CONFIG_TASK_XACCT 2073static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2074{ 2075 tsk->rchar += amt; 2076} 2077 2078static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2079{ 2080 tsk->wchar += amt; 2081} 2082 2083static inline void inc_syscr(struct task_struct *tsk) 2084{ 2085 tsk->syscr++; 2086} 2087 2088static inline void inc_syscw(struct task_struct *tsk) 2089{ 2090 tsk->syscw++; 2091} 2092#else 2093static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2094{ 2095} 2096 2097static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2098{ 2099} 2100 2101static inline void inc_syscr(struct task_struct *tsk) 2102{ 2103} 2104 2105static inline void inc_syscw(struct task_struct *tsk) 2106{ 2107} 2108#endif 2109 2110#ifdef CONFIG_SMP 2111void migration_init(void); 2112#else 2113static inline void migration_init(void) 2114{ 2115} 2116#endif 2117 2118#ifndef TASK_SIZE_OF 2119#define TASK_SIZE_OF(tsk) TASK_SIZE 2120#endif 2121 2122#endif /* __KERNEL__ */ 2123 2124#endif 2125