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 asmlinkage void schedule_tail(struct task_struct *prev); 246 extern void init_idle(struct task_struct *idle, int cpu); 247 extern void init_idle_bootup_task(struct task_struct *idle); 248 249 extern cpumask_t nohz_cpu_mask; 250 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 251 extern int select_nohz_load_balancer(int cpu); 252 #else 253 static inline int select_nohz_load_balancer(int cpu) 254 { 255 return 0; 256 } 257 #endif 258 259 extern unsigned long rt_needs_cpu(int cpu); 260 261 /* 262 * Only dump TASK_* tasks. (0 for all tasks) 263 */ 264 extern void show_state_filter(unsigned long state_filter); 265 266 static inline void show_state(void) 267 { 268 show_state_filter(0); 269 } 270 271 extern 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 */ 278 extern void show_stack(struct task_struct *task, unsigned long *sp); 279 280 void io_schedule(void); 281 long io_schedule_timeout(long timeout); 282 283 extern void cpu_init (void); 284 extern void trap_init(void); 285 extern void account_process_tick(struct task_struct *task, int user); 286 extern void update_process_times(int user); 287 extern void scheduler_tick(void); 288 extern void hrtick_resched(void); 289 290 extern void sched_show_task(struct task_struct *p); 291 292 #ifdef CONFIG_DETECT_SOFTLOCKUP 293 extern void softlockup_tick(void); 294 extern void spawn_softlockup_task(void); 295 extern void touch_softlockup_watchdog(void); 296 extern void touch_all_softlockup_watchdogs(void); 297 extern unsigned long softlockup_thresh; 298 extern unsigned long sysctl_hung_task_check_count; 299 extern unsigned long sysctl_hung_task_timeout_secs; 300 extern unsigned long sysctl_hung_task_warnings; 301 #else 302 static inline void softlockup_tick(void) 303 { 304 } 305 static inline void spawn_softlockup_task(void) 306 { 307 } 308 static inline void touch_softlockup_watchdog(void) 309 { 310 } 311 static 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 */ 321 extern char __sched_text_start[], __sched_text_end[]; 322 323 /* Is this address in the __sched functions? */ 324 extern int in_sched_functions(unsigned long addr); 325 326 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 327 extern signed long schedule_timeout(signed long timeout); 328 extern signed long schedule_timeout_interruptible(signed long timeout); 329 extern signed long schedule_timeout_killable(signed long timeout); 330 extern signed long schedule_timeout_uninterruptible(signed long timeout); 331 asmlinkage void schedule(void); 332 333 struct nsproxy; 334 struct user_namespace; 335 336 /* Maximum number of active map areas.. This is a random (large) number */ 337 #define DEFAULT_MAX_MAP_COUNT 65536 338 339 extern int sysctl_max_map_count; 340 341 #include <linux/aio.h> 342 343 extern unsigned long 344 arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 345 unsigned long, unsigned long); 346 extern unsigned long 347 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 348 unsigned long len, unsigned long pgoff, 349 unsigned long flags); 350 extern void arch_unmap_area(struct mm_struct *, unsigned long); 351 extern 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) 388 389 extern void set_dumpable(struct mm_struct *mm, int value); 390 extern 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)) 410 411 struct sighand_struct { 412 atomic_t count; 413 struct k_sigaction action[_NSIG]; 414 spinlock_t siglock; 415 wait_queue_head_t signalfd_wqh; 416 }; 417 418 struct 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 */ 433 struct 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 */ 561 static 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 */ 570 struct 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 }; 602 603 extern int uids_sysfs_init(void); 604 605 extern struct user_struct *find_user(uid_t); 606 607 extern struct user_struct root_user; 608 #define INIT_USER (&root_user) 609 610 struct backing_dev_info; 611 struct reclaim_state; 612 613 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 614 struct 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 631 extern const struct file_operations proc_schedstat_operations; 632 #endif /* CONFIG_SCHEDSTATS */ 633 634 #ifdef CONFIG_TASK_DELAY_ACCT 635 struct 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 */ 663 664 static 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 } 675 676 enum 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) 717 718 719 struct 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 }; 735 736 struct 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 }; 791 792 extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new); 793 extern 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 */ 803 static 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 } 813 814 struct io_context; /* See blkdev.h */ 815 #define NGROUPS_SMALL 32 816 #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t))) 817 struct 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) 839 840 extern struct group_info *groups_alloc(int gidsetsize); 841 extern void groups_free(struct group_info *group_info); 842 extern int set_current_groups(struct group_info *group_info); 843 extern 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 849 extern void prefetch_stack(struct task_struct *t); 850 #else 851 static inline void prefetch_stack(struct task_struct *t) { } 852 #endif 853 854 struct audit_context; /* See audit.c */ 855 struct mempolicy; 856 struct pipe_inode_info; 857 struct uts_namespace; 858 859 struct rq; 860 struct sched_domain; 861 862 struct 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, cpumask_t *newmask); 893 894 void (*join_domain)(struct rq *rq); 895 void (*leave_domain)(struct rq *rq); 896 897 void (*switched_from) (struct rq *this_rq, struct task_struct *task, 898 int running); 899 void (*switched_to) (struct rq *this_rq, struct task_struct *task, 900 int running); 901 void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 902 int oldprio, int running); 903 904 #ifdef CONFIG_FAIR_GROUP_SCHED 905 void (*moved_group) (struct task_struct *p); 906 #endif 907 }; 908 909 struct load_weight { 910 unsigned long weight, inv_weight; 911 }; 912 913 /* 914 * CFS stats for a schedulable entity (task, task-group etc) 915 * 916 * Current field usage histogram: 917 * 918 * 4 se->block_start 919 * 4 se->run_node 920 * 4 se->sleep_start 921 * 6 se->load.weight 922 */ 923 struct sched_entity { 924 struct load_weight load; /* for load-balancing */ 925 struct rb_node run_node; 926 unsigned int on_rq; 927 928 u64 exec_start; 929 u64 sum_exec_runtime; 930 u64 vruntime; 931 u64 prev_sum_exec_runtime; 932 933 u64 last_wakeup; 934 u64 avg_overlap; 935 936 #ifdef CONFIG_SCHEDSTATS 937 u64 wait_start; 938 u64 wait_max; 939 u64 wait_count; 940 u64 wait_sum; 941 942 u64 sleep_start; 943 u64 sleep_max; 944 s64 sum_sleep_runtime; 945 946 u64 block_start; 947 u64 block_max; 948 u64 exec_max; 949 u64 slice_max; 950 951 u64 nr_migrations; 952 u64 nr_migrations_cold; 953 u64 nr_failed_migrations_affine; 954 u64 nr_failed_migrations_running; 955 u64 nr_failed_migrations_hot; 956 u64 nr_forced_migrations; 957 u64 nr_forced2_migrations; 958 959 u64 nr_wakeups; 960 u64 nr_wakeups_sync; 961 u64 nr_wakeups_migrate; 962 u64 nr_wakeups_local; 963 u64 nr_wakeups_remote; 964 u64 nr_wakeups_affine; 965 u64 nr_wakeups_affine_attempts; 966 u64 nr_wakeups_passive; 967 u64 nr_wakeups_idle; 968 #endif 969 970 #ifdef CONFIG_FAIR_GROUP_SCHED 971 struct sched_entity *parent; 972 /* rq on which this entity is (to be) queued: */ 973 struct cfs_rq *cfs_rq; 974 /* rq "owned" by this entity/group: */ 975 struct cfs_rq *my_q; 976 #endif 977 }; 978 979 struct sched_rt_entity { 980 struct list_head run_list; 981 unsigned int time_slice; 982 unsigned long timeout; 983 int nr_cpus_allowed; 984 985 #ifdef CONFIG_RT_GROUP_SCHED 986 struct sched_rt_entity *parent; 987 /* rq on which this entity is (to be) queued: */ 988 struct rt_rq *rt_rq; 989 /* rq "owned" by this entity/group: */ 990 struct rt_rq *my_q; 991 #endif 992 }; 993 994 struct task_struct { 995 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 996 void *stack; 997 atomic_t usage; 998 unsigned int flags; /* per process flags, defined below */ 999 unsigned int ptrace; 1000 1001 int lock_depth; /* BKL lock depth */ 1002 1003 #ifdef CONFIG_SMP 1004 #ifdef __ARCH_WANT_UNLOCKED_CTXSW 1005 int oncpu; 1006 #endif 1007 #endif 1008 1009 int prio, static_prio, normal_prio; 1010 const struct sched_class *sched_class; 1011 struct sched_entity se; 1012 struct sched_rt_entity rt; 1013 1014 #ifdef CONFIG_PREEMPT_NOTIFIERS 1015 /* list of struct preempt_notifier: */ 1016 struct hlist_head preempt_notifiers; 1017 #endif 1018 1019 /* 1020 * fpu_counter contains the number of consecutive context switches 1021 * that the FPU is used. If this is over a threshold, the lazy fpu 1022 * saving becomes unlazy to save the trap. This is an unsigned char 1023 * so that after 256 times the counter wraps and the behavior turns 1024 * lazy again; this to deal with bursty apps that only use FPU for 1025 * a short time 1026 */ 1027 unsigned char fpu_counter; 1028 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ 1029 #ifdef CONFIG_BLK_DEV_IO_TRACE 1030 unsigned int btrace_seq; 1031 #endif 1032 1033 unsigned int policy; 1034 cpumask_t cpus_allowed; 1035 1036 #ifdef CONFIG_PREEMPT_RCU 1037 int rcu_read_lock_nesting; 1038 int rcu_flipctr_idx; 1039 #endif /* #ifdef CONFIG_PREEMPT_RCU */ 1040 1041 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 1042 struct sched_info sched_info; 1043 #endif 1044 1045 struct list_head tasks; 1046 /* 1047 * ptrace_list/ptrace_children forms the list of my children 1048 * that were stolen by a ptracer. 1049 */ 1050 struct list_head ptrace_children; 1051 struct list_head ptrace_list; 1052 1053 struct mm_struct *mm, *active_mm; 1054 1055 /* task state */ 1056 struct linux_binfmt *binfmt; 1057 int exit_state; 1058 int exit_code, exit_signal; 1059 int pdeath_signal; /* The signal sent when the parent dies */ 1060 /* ??? */ 1061 unsigned int personality; 1062 unsigned did_exec:1; 1063 pid_t pid; 1064 pid_t tgid; 1065 1066 #ifdef CONFIG_CC_STACKPROTECTOR 1067 /* Canary value for the -fstack-protector gcc feature */ 1068 unsigned long stack_canary; 1069 #endif 1070 /* 1071 * pointers to (original) parent process, youngest child, younger sibling, 1072 * older sibling, respectively. (p->father can be replaced with 1073 * p->parent->pid) 1074 */ 1075 struct task_struct *real_parent; /* real parent process (when being debugged) */ 1076 struct task_struct *parent; /* parent process */ 1077 /* 1078 * children/sibling forms the list of my children plus the 1079 * tasks I'm ptracing. 1080 */ 1081 struct list_head children; /* list of my children */ 1082 struct list_head sibling; /* linkage in my parent's children list */ 1083 struct task_struct *group_leader; /* threadgroup leader */ 1084 1085 /* PID/PID hash table linkage. */ 1086 struct pid_link pids[PIDTYPE_MAX]; 1087 struct list_head thread_group; 1088 1089 struct completion *vfork_done; /* for vfork() */ 1090 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1091 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1092 1093 unsigned int rt_priority; 1094 cputime_t utime, stime, utimescaled, stimescaled; 1095 cputime_t gtime; 1096 cputime_t prev_utime, prev_stime; 1097 unsigned long nvcsw, nivcsw; /* context switch counts */ 1098 struct timespec start_time; /* monotonic time */ 1099 struct timespec real_start_time; /* boot based time */ 1100 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1101 unsigned long min_flt, maj_flt; 1102 1103 cputime_t it_prof_expires, it_virt_expires; 1104 unsigned long long it_sched_expires; 1105 struct list_head cpu_timers[3]; 1106 1107 /* process credentials */ 1108 uid_t uid,euid,suid,fsuid; 1109 gid_t gid,egid,sgid,fsgid; 1110 struct group_info *group_info; 1111 kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset; 1112 unsigned keep_capabilities:1; 1113 struct user_struct *user; 1114 #ifdef CONFIG_KEYS 1115 struct key *request_key_auth; /* assumed request_key authority */ 1116 struct key *thread_keyring; /* keyring private to this thread */ 1117 unsigned char jit_keyring; /* default keyring to attach requested keys to */ 1118 #endif 1119 char comm[TASK_COMM_LEN]; /* executable name excluding path 1120 - access with [gs]et_task_comm (which lock 1121 it with task_lock()) 1122 - initialized normally by flush_old_exec */ 1123 /* file system info */ 1124 int link_count, total_link_count; 1125 #ifdef CONFIG_SYSVIPC 1126 /* ipc stuff */ 1127 struct sysv_sem sysvsem; 1128 #endif 1129 #ifdef CONFIG_DETECT_SOFTLOCKUP 1130 /* hung task detection */ 1131 unsigned long last_switch_timestamp; 1132 unsigned long last_switch_count; 1133 #endif 1134 /* CPU-specific state of this task */ 1135 struct thread_struct thread; 1136 /* filesystem information */ 1137 struct fs_struct *fs; 1138 /* open file information */ 1139 struct files_struct *files; 1140 /* namespaces */ 1141 struct nsproxy *nsproxy; 1142 /* signal handlers */ 1143 struct signal_struct *signal; 1144 struct sighand_struct *sighand; 1145 1146 sigset_t blocked, real_blocked; 1147 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */ 1148 struct sigpending pending; 1149 1150 unsigned long sas_ss_sp; 1151 size_t sas_ss_size; 1152 int (*notifier)(void *priv); 1153 void *notifier_data; 1154 sigset_t *notifier_mask; 1155 #ifdef CONFIG_SECURITY 1156 void *security; 1157 #endif 1158 struct audit_context *audit_context; 1159 #ifdef CONFIG_AUDITSYSCALL 1160 uid_t loginuid; 1161 unsigned int sessionid; 1162 #endif 1163 seccomp_t seccomp; 1164 1165 /* Thread group tracking */ 1166 u32 parent_exec_id; 1167 u32 self_exec_id; 1168 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 1169 spinlock_t alloc_lock; 1170 1171 /* Protection of the PI data structures: */ 1172 spinlock_t pi_lock; 1173 1174 #ifdef CONFIG_RT_MUTEXES 1175 /* PI waiters blocked on a rt_mutex held by this task */ 1176 struct plist_head pi_waiters; 1177 /* Deadlock detection and priority inheritance handling */ 1178 struct rt_mutex_waiter *pi_blocked_on; 1179 #endif 1180 1181 #ifdef CONFIG_DEBUG_MUTEXES 1182 /* mutex deadlock detection */ 1183 struct mutex_waiter *blocked_on; 1184 #endif 1185 #ifdef CONFIG_TRACE_IRQFLAGS 1186 unsigned int irq_events; 1187 int hardirqs_enabled; 1188 unsigned long hardirq_enable_ip; 1189 unsigned int hardirq_enable_event; 1190 unsigned long hardirq_disable_ip; 1191 unsigned int hardirq_disable_event; 1192 int softirqs_enabled; 1193 unsigned long softirq_disable_ip; 1194 unsigned int softirq_disable_event; 1195 unsigned long softirq_enable_ip; 1196 unsigned int softirq_enable_event; 1197 int hardirq_context; 1198 int softirq_context; 1199 #endif 1200 #ifdef CONFIG_LOCKDEP 1201 # define MAX_LOCK_DEPTH 48UL 1202 u64 curr_chain_key; 1203 int lockdep_depth; 1204 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1205 unsigned int lockdep_recursion; 1206 #endif 1207 1208 /* journalling filesystem info */ 1209 void *journal_info; 1210 1211 /* stacked block device info */ 1212 struct bio *bio_list, **bio_tail; 1213 1214 /* VM state */ 1215 struct reclaim_state *reclaim_state; 1216 1217 struct backing_dev_info *backing_dev_info; 1218 1219 struct io_context *io_context; 1220 1221 unsigned long ptrace_message; 1222 siginfo_t *last_siginfo; /* For ptrace use. */ 1223 #ifdef CONFIG_TASK_XACCT 1224 /* i/o counters(bytes read/written, #syscalls */ 1225 u64 rchar, wchar, syscr, syscw; 1226 #endif 1227 struct task_io_accounting ioac; 1228 #if defined(CONFIG_TASK_XACCT) 1229 u64 acct_rss_mem1; /* accumulated rss usage */ 1230 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1231 cputime_t acct_stimexpd;/* stime since last update */ 1232 #endif 1233 #ifdef CONFIG_NUMA 1234 struct mempolicy *mempolicy; 1235 short il_next; 1236 #endif 1237 #ifdef CONFIG_CPUSETS 1238 nodemask_t mems_allowed; 1239 int cpuset_mems_generation; 1240 int cpuset_mem_spread_rotor; 1241 #endif 1242 #ifdef CONFIG_CGROUPS 1243 /* Control Group info protected by css_set_lock */ 1244 struct css_set *cgroups; 1245 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1246 struct list_head cg_list; 1247 #endif 1248 #ifdef CONFIG_FUTEX 1249 struct robust_list_head __user *robust_list; 1250 #ifdef CONFIG_COMPAT 1251 struct compat_robust_list_head __user *compat_robust_list; 1252 #endif 1253 struct list_head pi_state_list; 1254 struct futex_pi_state *pi_state_cache; 1255 #endif 1256 atomic_t fs_excl; /* holding fs exclusive resources */ 1257 struct rcu_head rcu; 1258 1259 /* 1260 * cache last used pipe for splice 1261 */ 1262 struct pipe_inode_info *splice_pipe; 1263 #ifdef CONFIG_TASK_DELAY_ACCT 1264 struct task_delay_info *delays; 1265 #endif 1266 #ifdef CONFIG_FAULT_INJECTION 1267 int make_it_fail; 1268 #endif 1269 struct prop_local_single dirties; 1270 #ifdef CONFIG_LATENCYTOP 1271 int latency_record_count; 1272 struct latency_record latency_record[LT_SAVECOUNT]; 1273 #endif 1274 }; 1275 1276 /* 1277 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1278 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1279 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1280 * values are inverted: lower p->prio value means higher priority. 1281 * 1282 * The MAX_USER_RT_PRIO value allows the actual maximum 1283 * RT priority to be separate from the value exported to 1284 * user-space. This allows kernel threads to set their 1285 * priority to a value higher than any user task. Note: 1286 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1287 */ 1288 1289 #define MAX_USER_RT_PRIO 100 1290 #define MAX_RT_PRIO MAX_USER_RT_PRIO 1291 1292 #define MAX_PRIO (MAX_RT_PRIO + 40) 1293 #define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1294 1295 static inline int rt_prio(int prio) 1296 { 1297 if (unlikely(prio < MAX_RT_PRIO)) 1298 return 1; 1299 return 0; 1300 } 1301 1302 static inline int rt_task(struct task_struct *p) 1303 { 1304 return rt_prio(p->prio); 1305 } 1306 1307 static inline void set_task_session(struct task_struct *tsk, pid_t session) 1308 { 1309 tsk->signal->__session = session; 1310 } 1311 1312 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp) 1313 { 1314 tsk->signal->__pgrp = pgrp; 1315 } 1316 1317 static inline struct pid *task_pid(struct task_struct *task) 1318 { 1319 return task->pids[PIDTYPE_PID].pid; 1320 } 1321 1322 static inline struct pid *task_tgid(struct task_struct *task) 1323 { 1324 return task->group_leader->pids[PIDTYPE_PID].pid; 1325 } 1326 1327 static inline struct pid *task_pgrp(struct task_struct *task) 1328 { 1329 return task->group_leader->pids[PIDTYPE_PGID].pid; 1330 } 1331 1332 static inline struct pid *task_session(struct task_struct *task) 1333 { 1334 return task->group_leader->pids[PIDTYPE_SID].pid; 1335 } 1336 1337 struct pid_namespace; 1338 1339 /* 1340 * the helpers to get the task's different pids as they are seen 1341 * from various namespaces 1342 * 1343 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1344 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 1345 * current. 1346 * task_xid_nr_ns() : id seen from the ns specified; 1347 * 1348 * set_task_vxid() : assigns a virtual id to a task; 1349 * 1350 * see also pid_nr() etc in include/linux/pid.h 1351 */ 1352 1353 static inline pid_t task_pid_nr(struct task_struct *tsk) 1354 { 1355 return tsk->pid; 1356 } 1357 1358 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1359 1360 static inline pid_t task_pid_vnr(struct task_struct *tsk) 1361 { 1362 return pid_vnr(task_pid(tsk)); 1363 } 1364 1365 1366 static inline pid_t task_tgid_nr(struct task_struct *tsk) 1367 { 1368 return tsk->tgid; 1369 } 1370 1371 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1372 1373 static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1374 { 1375 return pid_vnr(task_tgid(tsk)); 1376 } 1377 1378 1379 static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1380 { 1381 return tsk->signal->__pgrp; 1382 } 1383 1384 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1385 1386 static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1387 { 1388 return pid_vnr(task_pgrp(tsk)); 1389 } 1390 1391 1392 static inline pid_t task_session_nr(struct task_struct *tsk) 1393 { 1394 return tsk->signal->__session; 1395 } 1396 1397 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1398 1399 static inline pid_t task_session_vnr(struct task_struct *tsk) 1400 { 1401 return pid_vnr(task_session(tsk)); 1402 } 1403 1404 1405 /** 1406 * pid_alive - check that a task structure is not stale 1407 * @p: Task structure to be checked. 1408 * 1409 * Test if a process is not yet dead (at most zombie state) 1410 * If pid_alive fails, then pointers within the task structure 1411 * can be stale and must not be dereferenced. 1412 */ 1413 static inline int pid_alive(struct task_struct *p) 1414 { 1415 return p->pids[PIDTYPE_PID].pid != NULL; 1416 } 1417 1418 /** 1419 * is_global_init - check if a task structure is init 1420 * @tsk: Task structure to be checked. 1421 * 1422 * Check if a task structure is the first user space task the kernel created. 1423 */ 1424 static inline int is_global_init(struct task_struct *tsk) 1425 { 1426 return tsk->pid == 1; 1427 } 1428 1429 /* 1430 * is_container_init: 1431 * check whether in the task is init in its own pid namespace. 1432 */ 1433 extern int is_container_init(struct task_struct *tsk); 1434 1435 extern struct pid *cad_pid; 1436 1437 extern void free_task(struct task_struct *tsk); 1438 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1439 1440 extern void __put_task_struct(struct task_struct *t); 1441 1442 static inline void put_task_struct(struct task_struct *t) 1443 { 1444 if (atomic_dec_and_test(&t->usage)) 1445 __put_task_struct(t); 1446 } 1447 1448 /* 1449 * Per process flags 1450 */ 1451 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 1452 /* Not implemented yet, only for 486*/ 1453 #define PF_STARTING 0x00000002 /* being created */ 1454 #define PF_EXITING 0x00000004 /* getting shut down */ 1455 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1456 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1457 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1458 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1459 #define PF_DUMPCORE 0x00000200 /* dumped core */ 1460 #define PF_SIGNALED 0x00000400 /* killed by a signal */ 1461 #define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1462 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 1463 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1464 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1465 #define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1466 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1467 #define PF_KSWAPD 0x00040000 /* I am kswapd */ 1468 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 1469 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1470 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */ 1471 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1472 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1473 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1474 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1475 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1476 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1477 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1478 1479 /* 1480 * Only the _current_ task can read/write to tsk->flags, but other 1481 * tasks can access tsk->flags in readonly mode for example 1482 * with tsk_used_math (like during threaded core dumping). 1483 * There is however an exception to this rule during ptrace 1484 * or during fork: the ptracer task is allowed to write to the 1485 * child->flags of its traced child (same goes for fork, the parent 1486 * can write to the child->flags), because we're guaranteed the 1487 * child is not running and in turn not changing child->flags 1488 * at the same time the parent does it. 1489 */ 1490 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1491 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1492 #define clear_used_math() clear_stopped_child_used_math(current) 1493 #define set_used_math() set_stopped_child_used_math(current) 1494 #define conditional_stopped_child_used_math(condition, child) \ 1495 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1496 #define conditional_used_math(condition) \ 1497 conditional_stopped_child_used_math(condition, current) 1498 #define copy_to_stopped_child_used_math(child) \ 1499 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1500 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1501 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1502 #define used_math() tsk_used_math(current) 1503 1504 #ifdef CONFIG_SMP 1505 extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask); 1506 #else 1507 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1508 { 1509 if (!cpu_isset(0, new_mask)) 1510 return -EINVAL; 1511 return 0; 1512 } 1513 #endif 1514 1515 extern unsigned long long sched_clock(void); 1516 1517 /* 1518 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1519 * clock constructed from sched_clock(): 1520 */ 1521 extern unsigned long long cpu_clock(int cpu); 1522 1523 extern unsigned long long 1524 task_sched_runtime(struct task_struct *task); 1525 1526 /* sched_exec is called by processes performing an exec */ 1527 #ifdef CONFIG_SMP 1528 extern void sched_exec(void); 1529 #else 1530 #define sched_exec() {} 1531 #endif 1532 1533 extern void sched_clock_idle_sleep_event(void); 1534 extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1535 1536 #ifdef CONFIG_HOTPLUG_CPU 1537 extern void idle_task_exit(void); 1538 #else 1539 static inline void idle_task_exit(void) {} 1540 #endif 1541 1542 extern void sched_idle_next(void); 1543 1544 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) 1545 extern void wake_up_idle_cpu(int cpu); 1546 #else 1547 static inline void wake_up_idle_cpu(int cpu) { } 1548 #endif 1549 1550 #ifdef CONFIG_SCHED_DEBUG 1551 extern unsigned int sysctl_sched_latency; 1552 extern unsigned int sysctl_sched_min_granularity; 1553 extern unsigned int sysctl_sched_wakeup_granularity; 1554 extern unsigned int sysctl_sched_batch_wakeup_granularity; 1555 extern unsigned int sysctl_sched_child_runs_first; 1556 extern unsigned int sysctl_sched_features; 1557 extern unsigned int sysctl_sched_migration_cost; 1558 extern unsigned int sysctl_sched_nr_migrate; 1559 1560 int sched_nr_latency_handler(struct ctl_table *table, int write, 1561 struct file *file, void __user *buffer, size_t *length, 1562 loff_t *ppos); 1563 #endif 1564 extern unsigned int sysctl_sched_rt_period; 1565 extern int sysctl_sched_rt_runtime; 1566 1567 extern unsigned int sysctl_sched_compat_yield; 1568 1569 #ifdef CONFIG_RT_MUTEXES 1570 extern int rt_mutex_getprio(struct task_struct *p); 1571 extern void rt_mutex_setprio(struct task_struct *p, int prio); 1572 extern void rt_mutex_adjust_pi(struct task_struct *p); 1573 #else 1574 static inline int rt_mutex_getprio(struct task_struct *p) 1575 { 1576 return p->normal_prio; 1577 } 1578 # define rt_mutex_adjust_pi(p) do { } while (0) 1579 #endif 1580 1581 extern void set_user_nice(struct task_struct *p, long nice); 1582 extern int task_prio(const struct task_struct *p); 1583 extern int task_nice(const struct task_struct *p); 1584 extern int can_nice(const struct task_struct *p, const int nice); 1585 extern int task_curr(const struct task_struct *p); 1586 extern int idle_cpu(int cpu); 1587 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1588 extern struct task_struct *idle_task(int cpu); 1589 extern struct task_struct *curr_task(int cpu); 1590 extern void set_curr_task(int cpu, struct task_struct *p); 1591 1592 void yield(void); 1593 1594 /* 1595 * The default (Linux) execution domain. 1596 */ 1597 extern struct exec_domain default_exec_domain; 1598 1599 union thread_union { 1600 struct thread_info thread_info; 1601 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1602 }; 1603 1604 #ifndef __HAVE_ARCH_KSTACK_END 1605 static inline int kstack_end(void *addr) 1606 { 1607 /* Reliable end of stack detection: 1608 * Some APM bios versions misalign the stack 1609 */ 1610 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1611 } 1612 #endif 1613 1614 extern union thread_union init_thread_union; 1615 extern struct task_struct init_task; 1616 1617 extern struct mm_struct init_mm; 1618 1619 extern struct pid_namespace init_pid_ns; 1620 1621 /* 1622 * find a task by one of its numerical ids 1623 * 1624 * find_task_by_pid_type_ns(): 1625 * it is the most generic call - it finds a task by all id, 1626 * type and namespace specified 1627 * find_task_by_pid_ns(): 1628 * finds a task by its pid in the specified namespace 1629 * find_task_by_vpid(): 1630 * finds a task by its virtual pid 1631 * find_task_by_pid(): 1632 * finds a task by its global pid 1633 * 1634 * see also find_pid() etc in include/linux/pid.h 1635 */ 1636 1637 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid, 1638 struct pid_namespace *ns); 1639 1640 extern struct task_struct *find_task_by_pid(pid_t nr); 1641 extern struct task_struct *find_task_by_vpid(pid_t nr); 1642 extern struct task_struct *find_task_by_pid_ns(pid_t nr, 1643 struct pid_namespace *ns); 1644 1645 extern void __set_special_pids(struct pid *pid); 1646 1647 /* per-UID process charging. */ 1648 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 1649 static inline struct user_struct *get_uid(struct user_struct *u) 1650 { 1651 atomic_inc(&u->__count); 1652 return u; 1653 } 1654 extern void free_uid(struct user_struct *); 1655 extern void switch_uid(struct user_struct *); 1656 extern void release_uids(struct user_namespace *ns); 1657 1658 #include <asm/current.h> 1659 1660 extern void do_timer(unsigned long ticks); 1661 1662 extern int wake_up_state(struct task_struct *tsk, unsigned int state); 1663 extern int wake_up_process(struct task_struct *tsk); 1664 extern void wake_up_new_task(struct task_struct *tsk, 1665 unsigned long clone_flags); 1666 #ifdef CONFIG_SMP 1667 extern void kick_process(struct task_struct *tsk); 1668 #else 1669 static inline void kick_process(struct task_struct *tsk) { } 1670 #endif 1671 extern void sched_fork(struct task_struct *p, int clone_flags); 1672 extern void sched_dead(struct task_struct *p); 1673 1674 extern int in_group_p(gid_t); 1675 extern int in_egroup_p(gid_t); 1676 1677 extern void proc_caches_init(void); 1678 extern void flush_signals(struct task_struct *); 1679 extern void ignore_signals(struct task_struct *); 1680 extern void flush_signal_handlers(struct task_struct *, int force_default); 1681 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 1682 1683 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 1684 { 1685 unsigned long flags; 1686 int ret; 1687 1688 spin_lock_irqsave(&tsk->sighand->siglock, flags); 1689 ret = dequeue_signal(tsk, mask, info); 1690 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 1691 1692 return ret; 1693 } 1694 1695 extern void block_all_signals(int (*notifier)(void *priv), void *priv, 1696 sigset_t *mask); 1697 extern void unblock_all_signals(void); 1698 extern void release_task(struct task_struct * p); 1699 extern int send_sig_info(int, struct siginfo *, struct task_struct *); 1700 extern int force_sigsegv(int, struct task_struct *); 1701 extern int force_sig_info(int, struct siginfo *, struct task_struct *); 1702 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1703 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 1704 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 1705 extern int kill_pgrp(struct pid *pid, int sig, int priv); 1706 extern int kill_pid(struct pid *pid, int sig, int priv); 1707 extern int kill_proc_info(int, struct siginfo *, pid_t); 1708 extern void do_notify_parent(struct task_struct *, int); 1709 extern void force_sig(int, struct task_struct *); 1710 extern void force_sig_specific(int, struct task_struct *); 1711 extern int send_sig(int, struct task_struct *, int); 1712 extern void zap_other_threads(struct task_struct *p); 1713 extern int kill_proc(pid_t, int, int); 1714 extern struct sigqueue *sigqueue_alloc(void); 1715 extern void sigqueue_free(struct sigqueue *); 1716 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); 1717 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); 1718 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 1719 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 1720 1721 static inline int kill_cad_pid(int sig, int priv) 1722 { 1723 return kill_pid(cad_pid, sig, priv); 1724 } 1725 1726 /* These can be the second arg to send_sig_info/send_group_sig_info. */ 1727 #define SEND_SIG_NOINFO ((struct siginfo *) 0) 1728 #define SEND_SIG_PRIV ((struct siginfo *) 1) 1729 #define SEND_SIG_FORCED ((struct siginfo *) 2) 1730 1731 static inline int is_si_special(const struct siginfo *info) 1732 { 1733 return info <= SEND_SIG_FORCED; 1734 } 1735 1736 /* True if we are on the alternate signal stack. */ 1737 1738 static inline int on_sig_stack(unsigned long sp) 1739 { 1740 return (sp - current->sas_ss_sp < current->sas_ss_size); 1741 } 1742 1743 static inline int sas_ss_flags(unsigned long sp) 1744 { 1745 return (current->sas_ss_size == 0 ? SS_DISABLE 1746 : on_sig_stack(sp) ? SS_ONSTACK : 0); 1747 } 1748 1749 /* 1750 * Routines for handling mm_structs 1751 */ 1752 extern struct mm_struct * mm_alloc(void); 1753 1754 /* mmdrop drops the mm and the page tables */ 1755 extern void __mmdrop(struct mm_struct *); 1756 static inline void mmdrop(struct mm_struct * mm) 1757 { 1758 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 1759 __mmdrop(mm); 1760 } 1761 1762 /* mmput gets rid of the mappings and all user-space */ 1763 extern void mmput(struct mm_struct *); 1764 /* Grab a reference to a task's mm, if it is not already going away */ 1765 extern struct mm_struct *get_task_mm(struct task_struct *task); 1766 /* Remove the current tasks stale references to the old mm_struct */ 1767 extern void mm_release(struct task_struct *, struct mm_struct *); 1768 1769 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 1770 extern void flush_thread(void); 1771 extern void exit_thread(void); 1772 1773 extern void exit_files(struct task_struct *); 1774 extern void __cleanup_signal(struct signal_struct *); 1775 extern void __cleanup_sighand(struct sighand_struct *); 1776 extern void exit_itimers(struct signal_struct *); 1777 1778 extern NORET_TYPE void do_group_exit(int); 1779 1780 extern void daemonize(const char *, ...); 1781 extern int allow_signal(int); 1782 extern int disallow_signal(int); 1783 1784 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 1785 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 1786 struct task_struct *fork_idle(int); 1787 1788 extern void set_task_comm(struct task_struct *tsk, char *from); 1789 extern char *get_task_comm(char *to, struct task_struct *tsk); 1790 1791 #ifdef CONFIG_SMP 1792 extern void wait_task_inactive(struct task_struct * p); 1793 #else 1794 #define wait_task_inactive(p) do { } while (0) 1795 #endif 1796 1797 #define remove_parent(p) list_del_init(&(p)->sibling) 1798 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children) 1799 1800 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) 1801 1802 #define for_each_process(p) \ 1803 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 1804 1805 /* 1806 * Careful: do_each_thread/while_each_thread is a double loop so 1807 * 'break' will not work as expected - use goto instead. 1808 */ 1809 #define do_each_thread(g, t) \ 1810 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 1811 1812 #define while_each_thread(g, t) \ 1813 while ((t = next_thread(t)) != g) 1814 1815 /* de_thread depends on thread_group_leader not being a pid based check */ 1816 #define thread_group_leader(p) (p == p->group_leader) 1817 1818 /* Do to the insanities of de_thread it is possible for a process 1819 * to have the pid of the thread group leader without actually being 1820 * the thread group leader. For iteration through the pids in proc 1821 * all we care about is that we have a task with the appropriate 1822 * pid, we don't actually care if we have the right task. 1823 */ 1824 static inline int has_group_leader_pid(struct task_struct *p) 1825 { 1826 return p->pid == p->tgid; 1827 } 1828 1829 static inline 1830 int same_thread_group(struct task_struct *p1, struct task_struct *p2) 1831 { 1832 return p1->tgid == p2->tgid; 1833 } 1834 1835 static inline struct task_struct *next_thread(const struct task_struct *p) 1836 { 1837 return list_entry(rcu_dereference(p->thread_group.next), 1838 struct task_struct, thread_group); 1839 } 1840 1841 static inline int thread_group_empty(struct task_struct *p) 1842 { 1843 return list_empty(&p->thread_group); 1844 } 1845 1846 #define delay_group_leader(p) \ 1847 (thread_group_leader(p) && !thread_group_empty(p)) 1848 1849 /* 1850 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 1851 * subscriptions and synchronises with wait4(). Also used in procfs. Also 1852 * pins the final release of task.io_context. Also protects ->cpuset and 1853 * ->cgroup.subsys[]. 1854 * 1855 * Nests both inside and outside of read_lock(&tasklist_lock). 1856 * It must not be nested with write_lock_irq(&tasklist_lock), 1857 * neither inside nor outside. 1858 */ 1859 static inline void task_lock(struct task_struct *p) 1860 { 1861 spin_lock(&p->alloc_lock); 1862 } 1863 1864 static inline void task_unlock(struct task_struct *p) 1865 { 1866 spin_unlock(&p->alloc_lock); 1867 } 1868 1869 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 1870 unsigned long *flags); 1871 1872 static inline void unlock_task_sighand(struct task_struct *tsk, 1873 unsigned long *flags) 1874 { 1875 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 1876 } 1877 1878 #ifndef __HAVE_THREAD_FUNCTIONS 1879 1880 #define task_thread_info(task) ((struct thread_info *)(task)->stack) 1881 #define task_stack_page(task) ((task)->stack) 1882 1883 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 1884 { 1885 *task_thread_info(p) = *task_thread_info(org); 1886 task_thread_info(p)->task = p; 1887 } 1888 1889 static inline unsigned long *end_of_stack(struct task_struct *p) 1890 { 1891 return (unsigned long *)(task_thread_info(p) + 1); 1892 } 1893 1894 #endif 1895 1896 /* set thread flags in other task's structures 1897 * - see asm/thread_info.h for TIF_xxxx flags available 1898 */ 1899 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 1900 { 1901 set_ti_thread_flag(task_thread_info(tsk), flag); 1902 } 1903 1904 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1905 { 1906 clear_ti_thread_flag(task_thread_info(tsk), flag); 1907 } 1908 1909 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 1910 { 1911 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 1912 } 1913 1914 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1915 { 1916 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 1917 } 1918 1919 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 1920 { 1921 return test_ti_thread_flag(task_thread_info(tsk), flag); 1922 } 1923 1924 static inline void set_tsk_need_resched(struct task_struct *tsk) 1925 { 1926 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1927 } 1928 1929 static inline void clear_tsk_need_resched(struct task_struct *tsk) 1930 { 1931 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1932 } 1933 1934 static inline int signal_pending(struct task_struct *p) 1935 { 1936 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 1937 } 1938 1939 extern int __fatal_signal_pending(struct task_struct *p); 1940 1941 static inline int fatal_signal_pending(struct task_struct *p) 1942 { 1943 return signal_pending(p) && __fatal_signal_pending(p); 1944 } 1945 1946 static inline int need_resched(void) 1947 { 1948 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 1949 } 1950 1951 /* 1952 * cond_resched() and cond_resched_lock(): latency reduction via 1953 * explicit rescheduling in places that are safe. The return 1954 * value indicates whether a reschedule was done in fact. 1955 * cond_resched_lock() will drop the spinlock before scheduling, 1956 * cond_resched_softirq() will enable bhs before scheduling. 1957 */ 1958 #ifdef CONFIG_PREEMPT 1959 static inline int cond_resched(void) 1960 { 1961 return 0; 1962 } 1963 #else 1964 extern int _cond_resched(void); 1965 static inline int cond_resched(void) 1966 { 1967 return _cond_resched(); 1968 } 1969 #endif 1970 extern int cond_resched_lock(spinlock_t * lock); 1971 extern int cond_resched_softirq(void); 1972 1973 /* 1974 * Does a critical section need to be broken due to another 1975 * task waiting?: (technically does not depend on CONFIG_PREEMPT, 1976 * but a general need for low latency) 1977 */ 1978 static inline int spin_needbreak(spinlock_t *lock) 1979 { 1980 #ifdef CONFIG_PREEMPT 1981 return spin_is_contended(lock); 1982 #else 1983 return 0; 1984 #endif 1985 } 1986 1987 /* 1988 * Reevaluate whether the task has signals pending delivery. 1989 * Wake the task if so. 1990 * This is required every time the blocked sigset_t changes. 1991 * callers must hold sighand->siglock. 1992 */ 1993 extern void recalc_sigpending_and_wake(struct task_struct *t); 1994 extern void recalc_sigpending(void); 1995 1996 extern void signal_wake_up(struct task_struct *t, int resume_stopped); 1997 1998 /* 1999 * Wrappers for p->thread_info->cpu access. No-op on UP. 2000 */ 2001 #ifdef CONFIG_SMP 2002 2003 static inline unsigned int task_cpu(const struct task_struct *p) 2004 { 2005 return task_thread_info(p)->cpu; 2006 } 2007 2008 extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 2009 2010 #else 2011 2012 static inline unsigned int task_cpu(const struct task_struct *p) 2013 { 2014 return 0; 2015 } 2016 2017 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 2018 { 2019 } 2020 2021 #endif /* CONFIG_SMP */ 2022 2023 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 2024 extern void arch_pick_mmap_layout(struct mm_struct *mm); 2025 #else 2026 static inline void arch_pick_mmap_layout(struct mm_struct *mm) 2027 { 2028 mm->mmap_base = TASK_UNMAPPED_BASE; 2029 mm->get_unmapped_area = arch_get_unmapped_area; 2030 mm->unmap_area = arch_unmap_area; 2031 } 2032 #endif 2033 2034 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); 2035 extern long sched_getaffinity(pid_t pid, cpumask_t *mask); 2036 2037 extern int sched_mc_power_savings, sched_smt_power_savings; 2038 2039 extern void normalize_rt_tasks(void); 2040 2041 #ifdef CONFIG_GROUP_SCHED 2042 2043 extern struct task_group init_task_group; 2044 2045 extern struct task_group *sched_create_group(void); 2046 extern void sched_destroy_group(struct task_group *tg); 2047 extern void sched_move_task(struct task_struct *tsk); 2048 #ifdef CONFIG_FAIR_GROUP_SCHED 2049 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 2050 extern unsigned long sched_group_shares(struct task_group *tg); 2051 #endif 2052 #ifdef CONFIG_RT_GROUP_SCHED 2053 extern int sched_group_set_rt_runtime(struct task_group *tg, 2054 long rt_runtime_us); 2055 extern long sched_group_rt_runtime(struct task_group *tg); 2056 #endif 2057 #endif 2058 2059 #ifdef CONFIG_TASK_XACCT 2060 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2061 { 2062 tsk->rchar += amt; 2063 } 2064 2065 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2066 { 2067 tsk->wchar += amt; 2068 } 2069 2070 static inline void inc_syscr(struct task_struct *tsk) 2071 { 2072 tsk->syscr++; 2073 } 2074 2075 static inline void inc_syscw(struct task_struct *tsk) 2076 { 2077 tsk->syscw++; 2078 } 2079 #else 2080 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2081 { 2082 } 2083 2084 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2085 { 2086 } 2087 2088 static inline void inc_syscr(struct task_struct *tsk) 2089 { 2090 } 2091 2092 static inline void inc_syscw(struct task_struct *tsk) 2093 { 2094 } 2095 #endif 2096 2097 #ifdef CONFIG_SMP 2098 void migration_init(void); 2099 #else 2100 static inline void migration_init(void) 2101 { 2102 } 2103 #endif 2104 2105 #ifndef TASK_SIZE_OF 2106 #define TASK_SIZE_OF(tsk) TASK_SIZE 2107 #endif 2108 2109 #endif /* __KERNEL__ */ 2110 2111 #endif 2112