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