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/page.h> 65 #include <asm/ptrace.h> 66 #include <asm/cputime.h> 67 68 #include <linux/smp.h> 69 #include <linux/sem.h> 70 #include <linux/signal.h> 71 #include <linux/fs_struct.h> 72 #include <linux/compiler.h> 73 #include <linux/completion.h> 74 #include <linux/pid.h> 75 #include <linux/percpu.h> 76 #include <linux/topology.h> 77 #include <linux/proportions.h> 78 #include <linux/seccomp.h> 79 #include <linux/rcupdate.h> 80 #include <linux/rtmutex.h> 81 82 #include <linux/time.h> 83 #include <linux/param.h> 84 #include <linux/resource.h> 85 #include <linux/timer.h> 86 #include <linux/hrtimer.h> 87 #include <linux/task_io_accounting.h> 88 #include <linux/kobject.h> 89 #include <linux/latencytop.h> 90 #include <linux/cred.h> 91 92 #include <asm/processor.h> 93 94 struct mem_cgroup; 95 struct exec_domain; 96 struct futex_pi_state; 97 struct robust_list_head; 98 struct bio; 99 100 /* 101 * List of flags we want to share for kernel threads, 102 * if only because they are not used by them anyway. 103 */ 104 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 105 106 /* 107 * These are the constant used to fake the fixed-point load-average 108 * counting. Some notes: 109 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 110 * a load-average precision of 10 bits integer + 11 bits fractional 111 * - if you want to count load-averages more often, you need more 112 * precision, or rounding will get you. With 2-second counting freq, 113 * the EXP_n values would be 1981, 2034 and 2043 if still using only 114 * 11 bit fractions. 115 */ 116 extern unsigned long avenrun[]; /* Load averages */ 117 118 #define FSHIFT 11 /* nr of bits of precision */ 119 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 120 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ 121 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 122 #define EXP_5 2014 /* 1/exp(5sec/5min) */ 123 #define EXP_15 2037 /* 1/exp(5sec/15min) */ 124 125 #define CALC_LOAD(load,exp,n) \ 126 load *= exp; \ 127 load += n*(FIXED_1-exp); \ 128 load >>= FSHIFT; 129 130 extern unsigned long total_forks; 131 extern int nr_threads; 132 DECLARE_PER_CPU(unsigned long, process_counts); 133 extern int nr_processes(void); 134 extern unsigned long nr_running(void); 135 extern unsigned long nr_uninterruptible(void); 136 extern unsigned long nr_active(void); 137 extern unsigned long nr_iowait(void); 138 139 struct seq_file; 140 struct cfs_rq; 141 struct task_group; 142 #ifdef CONFIG_SCHED_DEBUG 143 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 144 extern void proc_sched_set_task(struct task_struct *p); 145 extern void 146 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 147 #else 148 static inline void 149 proc_sched_show_task(struct task_struct *p, struct seq_file *m) 150 { 151 } 152 static inline void proc_sched_set_task(struct task_struct *p) 153 { 154 } 155 static inline void 156 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 157 { 158 } 159 #endif 160 161 extern unsigned long long time_sync_thresh; 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 int runqueue_is_locked(void); 250 251 extern cpumask_t nohz_cpu_mask; 252 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 253 extern int select_nohz_load_balancer(int cpu); 254 #else 255 static inline int select_nohz_load_balancer(int cpu) 256 { 257 return 0; 258 } 259 #endif 260 261 extern unsigned long rt_needs_cpu(int cpu); 262 263 /* 264 * Only dump TASK_* tasks. (0 for all tasks) 265 */ 266 extern void show_state_filter(unsigned long state_filter); 267 268 static inline void show_state(void) 269 { 270 show_state_filter(0); 271 } 272 273 extern void show_regs(struct pt_regs *); 274 275 /* 276 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 277 * task), SP is the stack pointer of the first frame that should be shown in the back 278 * trace (or NULL if the entire call-chain of the task should be shown). 279 */ 280 extern void show_stack(struct task_struct *task, unsigned long *sp); 281 282 void io_schedule(void); 283 long io_schedule_timeout(long timeout); 284 285 extern void cpu_init (void); 286 extern void trap_init(void); 287 extern void account_process_tick(struct task_struct *task, int user); 288 extern void update_process_times(int user); 289 extern void scheduler_tick(void); 290 extern void hrtick_resched(void); 291 292 extern void sched_show_task(struct task_struct *p); 293 294 #ifdef CONFIG_DETECT_SOFTLOCKUP 295 extern void softlockup_tick(void); 296 extern void touch_softlockup_watchdog(void); 297 extern void touch_all_softlockup_watchdogs(void); 298 extern unsigned int softlockup_panic; 299 extern unsigned long sysctl_hung_task_check_count; 300 extern unsigned long sysctl_hung_task_timeout_secs; 301 extern unsigned long sysctl_hung_task_warnings; 302 extern int softlockup_thresh; 303 #else 304 static inline void softlockup_tick(void) 305 { 306 } 307 static inline void spawn_softlockup_task(void) 308 { 309 } 310 static inline void touch_softlockup_watchdog(void) 311 { 312 } 313 static inline void touch_all_softlockup_watchdogs(void) 314 { 315 } 316 #endif 317 318 319 /* Attach to any functions which should be ignored in wchan output. */ 320 #define __sched __attribute__((__section__(".sched.text"))) 321 322 /* Linker adds these: start and end of __sched functions */ 323 extern char __sched_text_start[], __sched_text_end[]; 324 325 /* Is this address in the __sched functions? */ 326 extern int in_sched_functions(unsigned long addr); 327 328 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 329 extern signed long schedule_timeout(signed long timeout); 330 extern signed long schedule_timeout_interruptible(signed long timeout); 331 extern signed long schedule_timeout_killable(signed long timeout); 332 extern signed long schedule_timeout_uninterruptible(signed long timeout); 333 asmlinkage void schedule(void); 334 335 struct nsproxy; 336 struct user_namespace; 337 338 /* Maximum number of active map areas.. This is a random (large) number */ 339 #define DEFAULT_MAX_MAP_COUNT 65536 340 341 extern int sysctl_max_map_count; 342 343 #include <linux/aio.h> 344 345 extern unsigned long 346 arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 347 unsigned long, unsigned long); 348 extern unsigned long 349 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 350 unsigned long len, unsigned long pgoff, 351 unsigned long flags); 352 extern void arch_unmap_area(struct mm_struct *, unsigned long); 353 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 354 355 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS 356 /* 357 * The mm counters are not protected by its page_table_lock, 358 * so must be incremented atomically. 359 */ 360 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) 361 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) 362 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) 363 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) 364 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) 365 366 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 367 /* 368 * The mm counters are protected by its page_table_lock, 369 * so can be incremented directly. 370 */ 371 #define set_mm_counter(mm, member, value) (mm)->_##member = (value) 372 #define get_mm_counter(mm, member) ((mm)->_##member) 373 #define add_mm_counter(mm, member, value) (mm)->_##member += (value) 374 #define inc_mm_counter(mm, member) (mm)->_##member++ 375 #define dec_mm_counter(mm, member) (mm)->_##member-- 376 377 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 378 379 #define get_mm_rss(mm) \ 380 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) 381 #define update_hiwater_rss(mm) do { \ 382 unsigned long _rss = get_mm_rss(mm); \ 383 if ((mm)->hiwater_rss < _rss) \ 384 (mm)->hiwater_rss = _rss; \ 385 } while (0) 386 #define update_hiwater_vm(mm) do { \ 387 if ((mm)->hiwater_vm < (mm)->total_vm) \ 388 (mm)->hiwater_vm = (mm)->total_vm; \ 389 } while (0) 390 391 extern void set_dumpable(struct mm_struct *mm, int value); 392 extern int get_dumpable(struct mm_struct *mm); 393 394 /* mm flags */ 395 /* dumpable bits */ 396 #define MMF_DUMPABLE 0 /* core dump is permitted */ 397 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 398 #define MMF_DUMPABLE_BITS 2 399 400 /* coredump filter bits */ 401 #define MMF_DUMP_ANON_PRIVATE 2 402 #define MMF_DUMP_ANON_SHARED 3 403 #define MMF_DUMP_MAPPED_PRIVATE 4 404 #define MMF_DUMP_MAPPED_SHARED 5 405 #define MMF_DUMP_ELF_HEADERS 6 406 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 407 #define MMF_DUMP_FILTER_BITS 5 408 #define MMF_DUMP_FILTER_MASK \ 409 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 410 #define MMF_DUMP_FILTER_DEFAULT \ 411 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED)) 412 413 struct sighand_struct { 414 atomic_t count; 415 struct k_sigaction action[_NSIG]; 416 spinlock_t siglock; 417 wait_queue_head_t signalfd_wqh; 418 }; 419 420 struct pacct_struct { 421 int ac_flag; 422 long ac_exitcode; 423 unsigned long ac_mem; 424 cputime_t ac_utime, ac_stime; 425 unsigned long ac_minflt, ac_majflt; 426 }; 427 428 /* 429 * NOTE! "signal_struct" does not have it's own 430 * locking, because a shared signal_struct always 431 * implies a shared sighand_struct, so locking 432 * sighand_struct is always a proper superset of 433 * the locking of signal_struct. 434 */ 435 struct signal_struct { 436 atomic_t count; 437 atomic_t live; 438 439 wait_queue_head_t wait_chldexit; /* for wait4() */ 440 441 /* current thread group signal load-balancing target: */ 442 struct task_struct *curr_target; 443 444 /* shared signal handling: */ 445 struct sigpending shared_pending; 446 447 /* thread group exit support */ 448 int group_exit_code; 449 /* overloaded: 450 * - notify group_exit_task when ->count is equal to notify_count 451 * - everyone except group_exit_task is stopped during signal delivery 452 * of fatal signals, group_exit_task processes the signal. 453 */ 454 struct task_struct *group_exit_task; 455 int notify_count; 456 457 /* thread group stop support, overloads group_exit_code too */ 458 int group_stop_count; 459 unsigned int flags; /* see SIGNAL_* flags below */ 460 461 /* POSIX.1b Interval Timers */ 462 struct list_head posix_timers; 463 464 /* ITIMER_REAL timer for the process */ 465 struct hrtimer real_timer; 466 struct pid *leader_pid; 467 ktime_t it_real_incr; 468 469 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 470 cputime_t it_prof_expires, it_virt_expires; 471 cputime_t it_prof_incr, it_virt_incr; 472 473 /* job control IDs */ 474 475 /* 476 * pgrp and session fields are deprecated. 477 * use the task_session_Xnr and task_pgrp_Xnr routines below 478 */ 479 480 union { 481 pid_t pgrp __deprecated; 482 pid_t __pgrp; 483 }; 484 485 struct pid *tty_old_pgrp; 486 487 union { 488 pid_t session __deprecated; 489 pid_t __session; 490 }; 491 492 /* boolean value for session group leader */ 493 int leader; 494 495 struct tty_struct *tty; /* NULL if no tty */ 496 497 /* 498 * Cumulative resource counters for dead threads in the group, 499 * and for reaped dead child processes forked by this group. 500 * Live threads maintain their own counters and add to these 501 * in __exit_signal, except for the group leader. 502 */ 503 cputime_t utime, stime, cutime, cstime; 504 cputime_t gtime; 505 cputime_t cgtime; 506 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 507 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 508 unsigned long inblock, oublock, cinblock, coublock; 509 struct task_io_accounting ioac; 510 511 /* 512 * Cumulative ns of scheduled CPU time for dead threads in the 513 * group, not including a zombie group leader. (This only differs 514 * from jiffies_to_ns(utime + stime) if sched_clock uses something 515 * other than jiffies.) 516 */ 517 unsigned long long sum_sched_runtime; 518 519 /* 520 * We don't bother to synchronize most readers of this at all, 521 * because there is no reader checking a limit that actually needs 522 * to get both rlim_cur and rlim_max atomically, and either one 523 * alone is a single word that can safely be read normally. 524 * getrlimit/setrlimit use task_lock(current->group_leader) to 525 * protect this instead of the siglock, because they really 526 * have no need to disable irqs. 527 */ 528 struct rlimit rlim[RLIM_NLIMITS]; 529 530 struct list_head cpu_timers[3]; 531 532 /* keep the process-shared keyrings here so that they do the right 533 * thing in threads created with CLONE_THREAD */ 534 #ifdef CONFIG_KEYS 535 struct key *session_keyring; /* keyring inherited over fork */ 536 struct key *process_keyring; /* keyring private to this process */ 537 #endif 538 #ifdef CONFIG_BSD_PROCESS_ACCT 539 struct pacct_struct pacct; /* per-process accounting information */ 540 #endif 541 #ifdef CONFIG_TASKSTATS 542 struct taskstats *stats; 543 #endif 544 #ifdef CONFIG_AUDIT 545 unsigned audit_tty; 546 struct tty_audit_buf *tty_audit_buf; 547 #endif 548 }; 549 550 /* Context switch must be unlocked if interrupts are to be enabled */ 551 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 552 # define __ARCH_WANT_UNLOCKED_CTXSW 553 #endif 554 555 /* 556 * Bits in flags field of signal_struct. 557 */ 558 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 559 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 560 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 561 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 562 /* 563 * Pending notifications to parent. 564 */ 565 #define SIGNAL_CLD_STOPPED 0x00000010 566 #define SIGNAL_CLD_CONTINUED 0x00000020 567 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) 568 569 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ 570 571 /* If true, all threads except ->group_exit_task have pending SIGKILL */ 572 static inline int signal_group_exit(const struct signal_struct *sig) 573 { 574 return (sig->flags & SIGNAL_GROUP_EXIT) || 575 (sig->group_exit_task != NULL); 576 } 577 578 /* 579 * Some day this will be a full-fledged user tracking system.. 580 */ 581 struct user_struct { 582 atomic_t __count; /* reference count */ 583 atomic_t processes; /* How many processes does this user have? */ 584 atomic_t files; /* How many open files does this user have? */ 585 atomic_t sigpending; /* How many pending signals does this user have? */ 586 #ifdef CONFIG_INOTIFY_USER 587 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 588 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 589 #endif 590 #ifdef CONFIG_POSIX_MQUEUE 591 /* protected by mq_lock */ 592 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 593 #endif 594 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 595 596 #ifdef CONFIG_KEYS 597 struct key *uid_keyring; /* UID specific keyring */ 598 struct key *session_keyring; /* UID's default session keyring */ 599 #endif 600 601 /* Hash table maintenance information */ 602 struct hlist_node uidhash_node; 603 uid_t uid; 604 605 #ifdef CONFIG_USER_SCHED 606 struct task_group *tg; 607 #ifdef CONFIG_SYSFS 608 struct kobject kobj; 609 struct work_struct work; 610 #endif 611 #endif 612 }; 613 614 extern int uids_sysfs_init(void); 615 616 extern struct user_struct *find_user(uid_t); 617 618 extern struct user_struct root_user; 619 #define INIT_USER (&root_user) 620 621 struct backing_dev_info; 622 struct reclaim_state; 623 624 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 625 struct sched_info { 626 /* cumulative counters */ 627 unsigned long pcount; /* # of times run on this cpu */ 628 unsigned long long cpu_time, /* time spent on the cpu */ 629 run_delay; /* time spent waiting on a runqueue */ 630 631 /* timestamps */ 632 unsigned long long last_arrival,/* when we last ran on a cpu */ 633 last_queued; /* when we were last queued to run */ 634 #ifdef CONFIG_SCHEDSTATS 635 /* BKL stats */ 636 unsigned int bkl_count; 637 #endif 638 }; 639 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 640 641 #ifdef CONFIG_SCHEDSTATS 642 extern const struct file_operations proc_schedstat_operations; 643 #endif /* CONFIG_SCHEDSTATS */ 644 645 #ifdef CONFIG_TASK_DELAY_ACCT 646 struct task_delay_info { 647 spinlock_t lock; 648 unsigned int flags; /* Private per-task flags */ 649 650 /* For each stat XXX, add following, aligned appropriately 651 * 652 * struct timespec XXX_start, XXX_end; 653 * u64 XXX_delay; 654 * u32 XXX_count; 655 * 656 * Atomicity of updates to XXX_delay, XXX_count protected by 657 * single lock above (split into XXX_lock if contention is an issue). 658 */ 659 660 /* 661 * XXX_count is incremented on every XXX operation, the delay 662 * associated with the operation is added to XXX_delay. 663 * XXX_delay contains the accumulated delay time in nanoseconds. 664 */ 665 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 666 u64 blkio_delay; /* wait for sync block io completion */ 667 u64 swapin_delay; /* wait for swapin block io completion */ 668 u32 blkio_count; /* total count of the number of sync block */ 669 /* io operations performed */ 670 u32 swapin_count; /* total count of the number of swapin block */ 671 /* io operations performed */ 672 673 struct timespec freepages_start, freepages_end; 674 u64 freepages_delay; /* wait for memory reclaim */ 675 u32 freepages_count; /* total count of memory reclaim */ 676 }; 677 #endif /* CONFIG_TASK_DELAY_ACCT */ 678 679 static inline int sched_info_on(void) 680 { 681 #ifdef CONFIG_SCHEDSTATS 682 return 1; 683 #elif defined(CONFIG_TASK_DELAY_ACCT) 684 extern int delayacct_on; 685 return delayacct_on; 686 #else 687 return 0; 688 #endif 689 } 690 691 enum cpu_idle_type { 692 CPU_IDLE, 693 CPU_NOT_IDLE, 694 CPU_NEWLY_IDLE, 695 CPU_MAX_IDLE_TYPES 696 }; 697 698 /* 699 * sched-domains (multiprocessor balancing) declarations: 700 */ 701 702 /* 703 * Increase resolution of nice-level calculations: 704 */ 705 #define SCHED_LOAD_SHIFT 10 706 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 707 708 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE 709 710 #ifdef CONFIG_SMP 711 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 712 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 713 #define SD_BALANCE_EXEC 4 /* Balance on exec */ 714 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 715 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 716 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 717 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 718 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 719 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ 720 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ 721 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */ 722 #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */ 723 724 #define BALANCE_FOR_MC_POWER \ 725 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0) 726 727 #define BALANCE_FOR_PKG_POWER \ 728 ((sched_mc_power_savings || sched_smt_power_savings) ? \ 729 SD_POWERSAVINGS_BALANCE : 0) 730 731 #define test_sd_parent(sd, flag) ((sd->parent && \ 732 (sd->parent->flags & flag)) ? 1 : 0) 733 734 735 struct sched_group { 736 struct sched_group *next; /* Must be a circular list */ 737 cpumask_t cpumask; 738 739 /* 740 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 741 * single CPU. This is read only (except for setup, hotplug CPU). 742 * Note : Never change cpu_power without recompute its reciprocal 743 */ 744 unsigned int __cpu_power; 745 /* 746 * reciprocal value of cpu_power to avoid expensive divides 747 * (see include/linux/reciprocal_div.h) 748 */ 749 u32 reciprocal_cpu_power; 750 }; 751 752 enum sched_domain_level { 753 SD_LV_NONE = 0, 754 SD_LV_SIBLING, 755 SD_LV_MC, 756 SD_LV_CPU, 757 SD_LV_NODE, 758 SD_LV_ALLNODES, 759 SD_LV_MAX 760 }; 761 762 struct sched_domain_attr { 763 int relax_domain_level; 764 }; 765 766 #define SD_ATTR_INIT (struct sched_domain_attr) { \ 767 .relax_domain_level = -1, \ 768 } 769 770 struct sched_domain { 771 /* These fields must be setup */ 772 struct sched_domain *parent; /* top domain must be null terminated */ 773 struct sched_domain *child; /* bottom domain must be null terminated */ 774 struct sched_group *groups; /* the balancing groups of the domain */ 775 cpumask_t span; /* span of all CPUs in this domain */ 776 unsigned long min_interval; /* Minimum balance interval ms */ 777 unsigned long max_interval; /* Maximum balance interval ms */ 778 unsigned int busy_factor; /* less balancing by factor if busy */ 779 unsigned int imbalance_pct; /* No balance until over watermark */ 780 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 781 unsigned int busy_idx; 782 unsigned int idle_idx; 783 unsigned int newidle_idx; 784 unsigned int wake_idx; 785 unsigned int forkexec_idx; 786 int flags; /* See SD_* */ 787 enum sched_domain_level level; 788 789 /* Runtime fields. */ 790 unsigned long last_balance; /* init to jiffies. units in jiffies */ 791 unsigned int balance_interval; /* initialise to 1. units in ms. */ 792 unsigned int nr_balance_failed; /* initialise to 0 */ 793 794 u64 last_update; 795 796 #ifdef CONFIG_SCHEDSTATS 797 /* load_balance() stats */ 798 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 799 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 800 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 801 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 802 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 803 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 804 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 805 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 806 807 /* Active load balancing */ 808 unsigned int alb_count; 809 unsigned int alb_failed; 810 unsigned int alb_pushed; 811 812 /* SD_BALANCE_EXEC stats */ 813 unsigned int sbe_count; 814 unsigned int sbe_balanced; 815 unsigned int sbe_pushed; 816 817 /* SD_BALANCE_FORK stats */ 818 unsigned int sbf_count; 819 unsigned int sbf_balanced; 820 unsigned int sbf_pushed; 821 822 /* try_to_wake_up() stats */ 823 unsigned int ttwu_wake_remote; 824 unsigned int ttwu_move_affine; 825 unsigned int ttwu_move_balance; 826 #endif 827 }; 828 829 extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new, 830 struct sched_domain_attr *dattr_new); 831 extern int arch_reinit_sched_domains(void); 832 833 #else /* CONFIG_SMP */ 834 835 struct sched_domain_attr; 836 837 static inline void 838 partition_sched_domains(int ndoms_new, cpumask_t *doms_new, 839 struct sched_domain_attr *dattr_new) 840 { 841 } 842 #endif /* !CONFIG_SMP */ 843 844 struct io_context; /* See blkdev.h */ 845 #define NGROUPS_SMALL 32 846 #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t))) 847 struct group_info { 848 int ngroups; 849 atomic_t usage; 850 gid_t small_block[NGROUPS_SMALL]; 851 int nblocks; 852 gid_t *blocks[0]; 853 }; 854 855 /* 856 * get_group_info() must be called with the owning task locked (via task_lock()) 857 * when task != current. The reason being that the vast majority of callers are 858 * looking at current->group_info, which can not be changed except by the 859 * current task. Changing current->group_info requires the task lock, too. 860 */ 861 #define get_group_info(group_info) do { \ 862 atomic_inc(&(group_info)->usage); \ 863 } while (0) 864 865 #define put_group_info(group_info) do { \ 866 if (atomic_dec_and_test(&(group_info)->usage)) \ 867 groups_free(group_info); \ 868 } while (0) 869 870 extern struct group_info *groups_alloc(int gidsetsize); 871 extern void groups_free(struct group_info *group_info); 872 extern int set_current_groups(struct group_info *group_info); 873 extern int groups_search(struct group_info *group_info, gid_t grp); 874 /* access the groups "array" with this macro */ 875 #define GROUP_AT(gi, i) \ 876 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) 877 878 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 879 extern void prefetch_stack(struct task_struct *t); 880 #else 881 static inline void prefetch_stack(struct task_struct *t) { } 882 #endif 883 884 struct audit_context; /* See audit.c */ 885 struct mempolicy; 886 struct pipe_inode_info; 887 struct uts_namespace; 888 889 struct rq; 890 struct sched_domain; 891 892 struct sched_class { 893 const struct sched_class *next; 894 895 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); 896 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); 897 void (*yield_task) (struct rq *rq); 898 int (*select_task_rq)(struct task_struct *p, int sync); 899 900 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p); 901 902 struct task_struct * (*pick_next_task) (struct rq *rq); 903 void (*put_prev_task) (struct rq *rq, struct task_struct *p); 904 905 #ifdef CONFIG_SMP 906 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, 907 struct rq *busiest, unsigned long max_load_move, 908 struct sched_domain *sd, enum cpu_idle_type idle, 909 int *all_pinned, int *this_best_prio); 910 911 int (*move_one_task) (struct rq *this_rq, int this_cpu, 912 struct rq *busiest, struct sched_domain *sd, 913 enum cpu_idle_type idle); 914 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); 915 void (*post_schedule) (struct rq *this_rq); 916 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task); 917 #endif 918 919 void (*set_curr_task) (struct rq *rq); 920 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 921 void (*task_new) (struct rq *rq, struct task_struct *p); 922 void (*set_cpus_allowed)(struct task_struct *p, 923 const cpumask_t *newmask); 924 925 void (*rq_online)(struct rq *rq); 926 void (*rq_offline)(struct rq *rq); 927 928 void (*switched_from) (struct rq *this_rq, struct task_struct *task, 929 int running); 930 void (*switched_to) (struct rq *this_rq, struct task_struct *task, 931 int running); 932 void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 933 int oldprio, int running); 934 935 #ifdef CONFIG_FAIR_GROUP_SCHED 936 void (*moved_group) (struct task_struct *p); 937 #endif 938 }; 939 940 struct load_weight { 941 unsigned long weight, inv_weight; 942 }; 943 944 /* 945 * CFS stats for a schedulable entity (task, task-group etc) 946 * 947 * Current field usage histogram: 948 * 949 * 4 se->block_start 950 * 4 se->run_node 951 * 4 se->sleep_start 952 * 6 se->load.weight 953 */ 954 struct sched_entity { 955 struct load_weight load; /* for load-balancing */ 956 struct rb_node run_node; 957 struct list_head group_node; 958 unsigned int on_rq; 959 960 u64 exec_start; 961 u64 sum_exec_runtime; 962 u64 vruntime; 963 u64 prev_sum_exec_runtime; 964 965 u64 last_wakeup; 966 u64 avg_overlap; 967 968 #ifdef CONFIG_SCHEDSTATS 969 u64 wait_start; 970 u64 wait_max; 971 u64 wait_count; 972 u64 wait_sum; 973 974 u64 sleep_start; 975 u64 sleep_max; 976 s64 sum_sleep_runtime; 977 978 u64 block_start; 979 u64 block_max; 980 u64 exec_max; 981 u64 slice_max; 982 983 u64 nr_migrations; 984 u64 nr_migrations_cold; 985 u64 nr_failed_migrations_affine; 986 u64 nr_failed_migrations_running; 987 u64 nr_failed_migrations_hot; 988 u64 nr_forced_migrations; 989 u64 nr_forced2_migrations; 990 991 u64 nr_wakeups; 992 u64 nr_wakeups_sync; 993 u64 nr_wakeups_migrate; 994 u64 nr_wakeups_local; 995 u64 nr_wakeups_remote; 996 u64 nr_wakeups_affine; 997 u64 nr_wakeups_affine_attempts; 998 u64 nr_wakeups_passive; 999 u64 nr_wakeups_idle; 1000 #endif 1001 1002 #ifdef CONFIG_FAIR_GROUP_SCHED 1003 struct sched_entity *parent; 1004 /* rq on which this entity is (to be) queued: */ 1005 struct cfs_rq *cfs_rq; 1006 /* rq "owned" by this entity/group: */ 1007 struct cfs_rq *my_q; 1008 #endif 1009 }; 1010 1011 struct sched_rt_entity { 1012 struct list_head run_list; 1013 unsigned int time_slice; 1014 unsigned long timeout; 1015 int nr_cpus_allowed; 1016 1017 struct sched_rt_entity *back; 1018 #ifdef CONFIG_RT_GROUP_SCHED 1019 struct sched_rt_entity *parent; 1020 /* rq on which this entity is (to be) queued: */ 1021 struct rt_rq *rt_rq; 1022 /* rq "owned" by this entity/group: */ 1023 struct rt_rq *my_q; 1024 #endif 1025 }; 1026 1027 struct task_struct { 1028 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 1029 void *stack; 1030 atomic_t usage; 1031 unsigned int flags; /* per process flags, defined below */ 1032 unsigned int ptrace; 1033 1034 int lock_depth; /* BKL lock depth */ 1035 1036 #ifdef CONFIG_SMP 1037 #ifdef __ARCH_WANT_UNLOCKED_CTXSW 1038 int oncpu; 1039 #endif 1040 #endif 1041 1042 int prio, static_prio, normal_prio; 1043 unsigned int rt_priority; 1044 const struct sched_class *sched_class; 1045 struct sched_entity se; 1046 struct sched_rt_entity rt; 1047 1048 #ifdef CONFIG_PREEMPT_NOTIFIERS 1049 /* list of struct preempt_notifier: */ 1050 struct hlist_head preempt_notifiers; 1051 #endif 1052 1053 /* 1054 * fpu_counter contains the number of consecutive context switches 1055 * that the FPU is used. If this is over a threshold, the lazy fpu 1056 * saving becomes unlazy to save the trap. This is an unsigned char 1057 * so that after 256 times the counter wraps and the behavior turns 1058 * lazy again; this to deal with bursty apps that only use FPU for 1059 * a short time 1060 */ 1061 unsigned char fpu_counter; 1062 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ 1063 #ifdef CONFIG_BLK_DEV_IO_TRACE 1064 unsigned int btrace_seq; 1065 #endif 1066 1067 unsigned int policy; 1068 cpumask_t cpus_allowed; 1069 1070 #ifdef CONFIG_PREEMPT_RCU 1071 int rcu_read_lock_nesting; 1072 int rcu_flipctr_idx; 1073 #endif /* #ifdef CONFIG_PREEMPT_RCU */ 1074 1075 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 1076 struct sched_info sched_info; 1077 #endif 1078 1079 struct list_head tasks; 1080 1081 struct mm_struct *mm, *active_mm; 1082 1083 /* task state */ 1084 struct linux_binfmt *binfmt; 1085 int exit_state; 1086 int exit_code, exit_signal; 1087 int pdeath_signal; /* The signal sent when the parent dies */ 1088 /* ??? */ 1089 unsigned int personality; 1090 unsigned did_exec:1; 1091 pid_t pid; 1092 pid_t tgid; 1093 1094 #ifdef CONFIG_CC_STACKPROTECTOR 1095 /* Canary value for the -fstack-protector gcc feature */ 1096 unsigned long stack_canary; 1097 #endif 1098 /* 1099 * pointers to (original) parent process, youngest child, younger sibling, 1100 * older sibling, respectively. (p->father can be replaced with 1101 * p->real_parent->pid) 1102 */ 1103 struct task_struct *real_parent; /* real parent process */ 1104 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ 1105 /* 1106 * children/sibling forms the list of my natural children 1107 */ 1108 struct list_head children; /* list of my children */ 1109 struct list_head sibling; /* linkage in my parent's children list */ 1110 struct task_struct *group_leader; /* threadgroup leader */ 1111 1112 /* 1113 * ptraced is the list of tasks this task is using ptrace on. 1114 * This includes both natural children and PTRACE_ATTACH targets. 1115 * p->ptrace_entry is p's link on the p->parent->ptraced list. 1116 */ 1117 struct list_head ptraced; 1118 struct list_head ptrace_entry; 1119 1120 /* PID/PID hash table linkage. */ 1121 struct pid_link pids[PIDTYPE_MAX]; 1122 struct list_head thread_group; 1123 1124 struct completion *vfork_done; /* for vfork() */ 1125 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1126 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1127 1128 cputime_t utime, stime, utimescaled, stimescaled; 1129 cputime_t gtime; 1130 cputime_t prev_utime, prev_stime; 1131 unsigned long nvcsw, nivcsw; /* context switch counts */ 1132 struct timespec start_time; /* monotonic time */ 1133 struct timespec real_start_time; /* boot based time */ 1134 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1135 unsigned long min_flt, maj_flt; 1136 1137 cputime_t it_prof_expires, it_virt_expires; 1138 unsigned long long it_sched_expires; 1139 struct list_head cpu_timers[3]; 1140 1141 /* process credentials */ 1142 uid_t uid,euid,suid,fsuid; 1143 gid_t gid,egid,sgid,fsgid; 1144 struct group_info *group_info; 1145 kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset; 1146 struct user_struct *user; 1147 unsigned securebits; 1148 #ifdef CONFIG_KEYS 1149 unsigned char jit_keyring; /* default keyring to attach requested keys to */ 1150 struct key *request_key_auth; /* assumed request_key authority */ 1151 struct key *thread_keyring; /* keyring private to this thread */ 1152 #endif 1153 char comm[TASK_COMM_LEN]; /* executable name excluding path 1154 - access with [gs]et_task_comm (which lock 1155 it with task_lock()) 1156 - initialized normally by flush_old_exec */ 1157 /* file system info */ 1158 int link_count, total_link_count; 1159 #ifdef CONFIG_SYSVIPC 1160 /* ipc stuff */ 1161 struct sysv_sem sysvsem; 1162 #endif 1163 #ifdef CONFIG_DETECT_SOFTLOCKUP 1164 /* hung task detection */ 1165 unsigned long last_switch_timestamp; 1166 unsigned long last_switch_count; 1167 #endif 1168 /* CPU-specific state of this task */ 1169 struct thread_struct thread; 1170 /* filesystem information */ 1171 struct fs_struct *fs; 1172 /* open file information */ 1173 struct files_struct *files; 1174 /* namespaces */ 1175 struct nsproxy *nsproxy; 1176 /* signal handlers */ 1177 struct signal_struct *signal; 1178 struct sighand_struct *sighand; 1179 1180 sigset_t blocked, real_blocked; 1181 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ 1182 struct sigpending pending; 1183 1184 unsigned long sas_ss_sp; 1185 size_t sas_ss_size; 1186 int (*notifier)(void *priv); 1187 void *notifier_data; 1188 sigset_t *notifier_mask; 1189 #ifdef CONFIG_SECURITY 1190 void *security; 1191 #endif 1192 struct audit_context *audit_context; 1193 #ifdef CONFIG_AUDITSYSCALL 1194 uid_t loginuid; 1195 unsigned int sessionid; 1196 #endif 1197 seccomp_t seccomp; 1198 1199 /* Thread group tracking */ 1200 u32 parent_exec_id; 1201 u32 self_exec_id; 1202 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 1203 spinlock_t alloc_lock; 1204 1205 /* Protection of the PI data structures: */ 1206 spinlock_t pi_lock; 1207 1208 #ifdef CONFIG_RT_MUTEXES 1209 /* PI waiters blocked on a rt_mutex held by this task */ 1210 struct plist_head pi_waiters; 1211 /* Deadlock detection and priority inheritance handling */ 1212 struct rt_mutex_waiter *pi_blocked_on; 1213 #endif 1214 1215 #ifdef CONFIG_DEBUG_MUTEXES 1216 /* mutex deadlock detection */ 1217 struct mutex_waiter *blocked_on; 1218 #endif 1219 #ifdef CONFIG_TRACE_IRQFLAGS 1220 unsigned int irq_events; 1221 int hardirqs_enabled; 1222 unsigned long hardirq_enable_ip; 1223 unsigned int hardirq_enable_event; 1224 unsigned long hardirq_disable_ip; 1225 unsigned int hardirq_disable_event; 1226 int softirqs_enabled; 1227 unsigned long softirq_disable_ip; 1228 unsigned int softirq_disable_event; 1229 unsigned long softirq_enable_ip; 1230 unsigned int softirq_enable_event; 1231 int hardirq_context; 1232 int softirq_context; 1233 #endif 1234 #ifdef CONFIG_LOCKDEP 1235 # define MAX_LOCK_DEPTH 48UL 1236 u64 curr_chain_key; 1237 int lockdep_depth; 1238 unsigned int lockdep_recursion; 1239 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1240 #endif 1241 1242 /* journalling filesystem info */ 1243 void *journal_info; 1244 1245 /* stacked block device info */ 1246 struct bio *bio_list, **bio_tail; 1247 1248 /* VM state */ 1249 struct reclaim_state *reclaim_state; 1250 1251 struct backing_dev_info *backing_dev_info; 1252 1253 struct io_context *io_context; 1254 1255 unsigned long ptrace_message; 1256 siginfo_t *last_siginfo; /* For ptrace use. */ 1257 struct task_io_accounting ioac; 1258 #if defined(CONFIG_TASK_XACCT) 1259 u64 acct_rss_mem1; /* accumulated rss usage */ 1260 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1261 cputime_t acct_timexpd; /* stime + utime since last update */ 1262 #endif 1263 #ifdef CONFIG_CPUSETS 1264 nodemask_t mems_allowed; 1265 int cpuset_mems_generation; 1266 int cpuset_mem_spread_rotor; 1267 #endif 1268 #ifdef CONFIG_CGROUPS 1269 /* Control Group info protected by css_set_lock */ 1270 struct css_set *cgroups; 1271 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1272 struct list_head cg_list; 1273 #endif 1274 #ifdef CONFIG_FUTEX 1275 struct robust_list_head __user *robust_list; 1276 #ifdef CONFIG_COMPAT 1277 struct compat_robust_list_head __user *compat_robust_list; 1278 #endif 1279 struct list_head pi_state_list; 1280 struct futex_pi_state *pi_state_cache; 1281 #endif 1282 #ifdef CONFIG_NUMA 1283 struct mempolicy *mempolicy; 1284 short il_next; 1285 #endif 1286 atomic_t fs_excl; /* holding fs exclusive resources */ 1287 struct rcu_head rcu; 1288 1289 /* 1290 * cache last used pipe for splice 1291 */ 1292 struct pipe_inode_info *splice_pipe; 1293 #ifdef CONFIG_TASK_DELAY_ACCT 1294 struct task_delay_info *delays; 1295 #endif 1296 #ifdef CONFIG_FAULT_INJECTION 1297 int make_it_fail; 1298 #endif 1299 struct prop_local_single dirties; 1300 #ifdef CONFIG_LATENCYTOP 1301 int latency_record_count; 1302 struct latency_record latency_record[LT_SAVECOUNT]; 1303 #endif 1304 }; 1305 1306 /* 1307 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1308 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1309 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1310 * values are inverted: lower p->prio value means higher priority. 1311 * 1312 * The MAX_USER_RT_PRIO value allows the actual maximum 1313 * RT priority to be separate from the value exported to 1314 * user-space. This allows kernel threads to set their 1315 * priority to a value higher than any user task. Note: 1316 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1317 */ 1318 1319 #define MAX_USER_RT_PRIO 100 1320 #define MAX_RT_PRIO MAX_USER_RT_PRIO 1321 1322 #define MAX_PRIO (MAX_RT_PRIO + 40) 1323 #define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1324 1325 static inline int rt_prio(int prio) 1326 { 1327 if (unlikely(prio < MAX_RT_PRIO)) 1328 return 1; 1329 return 0; 1330 } 1331 1332 static inline int rt_task(struct task_struct *p) 1333 { 1334 return rt_prio(p->prio); 1335 } 1336 1337 static inline void set_task_session(struct task_struct *tsk, pid_t session) 1338 { 1339 tsk->signal->__session = session; 1340 } 1341 1342 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp) 1343 { 1344 tsk->signal->__pgrp = pgrp; 1345 } 1346 1347 static inline struct pid *task_pid(struct task_struct *task) 1348 { 1349 return task->pids[PIDTYPE_PID].pid; 1350 } 1351 1352 static inline struct pid *task_tgid(struct task_struct *task) 1353 { 1354 return task->group_leader->pids[PIDTYPE_PID].pid; 1355 } 1356 1357 static inline struct pid *task_pgrp(struct task_struct *task) 1358 { 1359 return task->group_leader->pids[PIDTYPE_PGID].pid; 1360 } 1361 1362 static inline struct pid *task_session(struct task_struct *task) 1363 { 1364 return task->group_leader->pids[PIDTYPE_SID].pid; 1365 } 1366 1367 struct pid_namespace; 1368 1369 /* 1370 * the helpers to get the task's different pids as they are seen 1371 * from various namespaces 1372 * 1373 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1374 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 1375 * current. 1376 * task_xid_nr_ns() : id seen from the ns specified; 1377 * 1378 * set_task_vxid() : assigns a virtual id to a task; 1379 * 1380 * see also pid_nr() etc in include/linux/pid.h 1381 */ 1382 1383 static inline pid_t task_pid_nr(struct task_struct *tsk) 1384 { 1385 return tsk->pid; 1386 } 1387 1388 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1389 1390 static inline pid_t task_pid_vnr(struct task_struct *tsk) 1391 { 1392 return pid_vnr(task_pid(tsk)); 1393 } 1394 1395 1396 static inline pid_t task_tgid_nr(struct task_struct *tsk) 1397 { 1398 return tsk->tgid; 1399 } 1400 1401 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1402 1403 static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1404 { 1405 return pid_vnr(task_tgid(tsk)); 1406 } 1407 1408 1409 static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1410 { 1411 return tsk->signal->__pgrp; 1412 } 1413 1414 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1415 1416 static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1417 { 1418 return pid_vnr(task_pgrp(tsk)); 1419 } 1420 1421 1422 static inline pid_t task_session_nr(struct task_struct *tsk) 1423 { 1424 return tsk->signal->__session; 1425 } 1426 1427 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1428 1429 static inline pid_t task_session_vnr(struct task_struct *tsk) 1430 { 1431 return pid_vnr(task_session(tsk)); 1432 } 1433 1434 1435 /** 1436 * pid_alive - check that a task structure is not stale 1437 * @p: Task structure to be checked. 1438 * 1439 * Test if a process is not yet dead (at most zombie state) 1440 * If pid_alive fails, then pointers within the task structure 1441 * can be stale and must not be dereferenced. 1442 */ 1443 static inline int pid_alive(struct task_struct *p) 1444 { 1445 return p->pids[PIDTYPE_PID].pid != NULL; 1446 } 1447 1448 /** 1449 * is_global_init - check if a task structure is init 1450 * @tsk: Task structure to be checked. 1451 * 1452 * Check if a task structure is the first user space task the kernel created. 1453 */ 1454 static inline int is_global_init(struct task_struct *tsk) 1455 { 1456 return tsk->pid == 1; 1457 } 1458 1459 /* 1460 * is_container_init: 1461 * check whether in the task is init in its own pid namespace. 1462 */ 1463 extern int is_container_init(struct task_struct *tsk); 1464 1465 extern struct pid *cad_pid; 1466 1467 extern void free_task(struct task_struct *tsk); 1468 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1469 1470 extern void __put_task_struct(struct task_struct *t); 1471 1472 static inline void put_task_struct(struct task_struct *t) 1473 { 1474 if (atomic_dec_and_test(&t->usage)) 1475 __put_task_struct(t); 1476 } 1477 1478 extern cputime_t task_utime(struct task_struct *p); 1479 extern cputime_t task_stime(struct task_struct *p); 1480 extern cputime_t task_gtime(struct task_struct *p); 1481 1482 /* 1483 * Per process flags 1484 */ 1485 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 1486 /* Not implemented yet, only for 486*/ 1487 #define PF_STARTING 0x00000002 /* being created */ 1488 #define PF_EXITING 0x00000004 /* getting shut down */ 1489 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1490 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1491 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1492 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1493 #define PF_DUMPCORE 0x00000200 /* dumped core */ 1494 #define PF_SIGNALED 0x00000400 /* killed by a signal */ 1495 #define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1496 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 1497 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1498 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1499 #define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1500 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1501 #define PF_KSWAPD 0x00040000 /* I am kswapd */ 1502 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 1503 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1504 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ 1505 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1506 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1507 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1508 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1509 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ 1510 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1511 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1512 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1513 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ 1514 1515 /* 1516 * Only the _current_ task can read/write to tsk->flags, but other 1517 * tasks can access tsk->flags in readonly mode for example 1518 * with tsk_used_math (like during threaded core dumping). 1519 * There is however an exception to this rule during ptrace 1520 * or during fork: the ptracer task is allowed to write to the 1521 * child->flags of its traced child (same goes for fork, the parent 1522 * can write to the child->flags), because we're guaranteed the 1523 * child is not running and in turn not changing child->flags 1524 * at the same time the parent does it. 1525 */ 1526 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1527 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1528 #define clear_used_math() clear_stopped_child_used_math(current) 1529 #define set_used_math() set_stopped_child_used_math(current) 1530 #define conditional_stopped_child_used_math(condition, child) \ 1531 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1532 #define conditional_used_math(condition) \ 1533 conditional_stopped_child_used_math(condition, current) 1534 #define copy_to_stopped_child_used_math(child) \ 1535 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1536 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1537 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1538 #define used_math() tsk_used_math(current) 1539 1540 #ifdef CONFIG_SMP 1541 extern int set_cpus_allowed_ptr(struct task_struct *p, 1542 const cpumask_t *new_mask); 1543 #else 1544 static inline int set_cpus_allowed_ptr(struct task_struct *p, 1545 const cpumask_t *new_mask) 1546 { 1547 if (!cpu_isset(0, *new_mask)) 1548 return -EINVAL; 1549 return 0; 1550 } 1551 #endif 1552 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1553 { 1554 return set_cpus_allowed_ptr(p, &new_mask); 1555 } 1556 1557 extern unsigned long long sched_clock(void); 1558 1559 extern void sched_clock_init(void); 1560 extern u64 sched_clock_cpu(int cpu); 1561 1562 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1563 static inline void sched_clock_tick(void) 1564 { 1565 } 1566 1567 static inline void sched_clock_idle_sleep_event(void) 1568 { 1569 } 1570 1571 static inline void sched_clock_idle_wakeup_event(u64 delta_ns) 1572 { 1573 } 1574 #else 1575 extern void sched_clock_tick(void); 1576 extern void sched_clock_idle_sleep_event(void); 1577 extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1578 #endif 1579 1580 /* 1581 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1582 * clock constructed from sched_clock(): 1583 */ 1584 extern unsigned long long cpu_clock(int cpu); 1585 1586 extern unsigned long long 1587 task_sched_runtime(struct task_struct *task); 1588 1589 /* sched_exec is called by processes performing an exec */ 1590 #ifdef CONFIG_SMP 1591 extern void sched_exec(void); 1592 #else 1593 #define sched_exec() {} 1594 #endif 1595 1596 extern void sched_clock_idle_sleep_event(void); 1597 extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1598 1599 #ifdef CONFIG_HOTPLUG_CPU 1600 extern void idle_task_exit(void); 1601 #else 1602 static inline void idle_task_exit(void) {} 1603 #endif 1604 1605 extern void sched_idle_next(void); 1606 1607 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) 1608 extern void wake_up_idle_cpu(int cpu); 1609 #else 1610 static inline void wake_up_idle_cpu(int cpu) { } 1611 #endif 1612 1613 #ifdef CONFIG_SCHED_DEBUG 1614 extern unsigned int sysctl_sched_latency; 1615 extern unsigned int sysctl_sched_min_granularity; 1616 extern unsigned int sysctl_sched_wakeup_granularity; 1617 extern unsigned int sysctl_sched_child_runs_first; 1618 extern unsigned int sysctl_sched_features; 1619 extern unsigned int sysctl_sched_migration_cost; 1620 extern unsigned int sysctl_sched_nr_migrate; 1621 extern unsigned int sysctl_sched_shares_ratelimit; 1622 1623 int sched_nr_latency_handler(struct ctl_table *table, int write, 1624 struct file *file, void __user *buffer, size_t *length, 1625 loff_t *ppos); 1626 #endif 1627 extern unsigned int sysctl_sched_rt_period; 1628 extern int sysctl_sched_rt_runtime; 1629 1630 int sched_rt_handler(struct ctl_table *table, int write, 1631 struct file *filp, void __user *buffer, size_t *lenp, 1632 loff_t *ppos); 1633 1634 extern unsigned int sysctl_sched_compat_yield; 1635 1636 #ifdef CONFIG_RT_MUTEXES 1637 extern int rt_mutex_getprio(struct task_struct *p); 1638 extern void rt_mutex_setprio(struct task_struct *p, int prio); 1639 extern void rt_mutex_adjust_pi(struct task_struct *p); 1640 #else 1641 static inline int rt_mutex_getprio(struct task_struct *p) 1642 { 1643 return p->normal_prio; 1644 } 1645 # define rt_mutex_adjust_pi(p) do { } while (0) 1646 #endif 1647 1648 extern void set_user_nice(struct task_struct *p, long nice); 1649 extern int task_prio(const struct task_struct *p); 1650 extern int task_nice(const struct task_struct *p); 1651 extern int can_nice(const struct task_struct *p, const int nice); 1652 extern int task_curr(const struct task_struct *p); 1653 extern int idle_cpu(int cpu); 1654 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1655 extern int sched_setscheduler_nocheck(struct task_struct *, int, 1656 struct sched_param *); 1657 extern struct task_struct *idle_task(int cpu); 1658 extern struct task_struct *curr_task(int cpu); 1659 extern void set_curr_task(int cpu, struct task_struct *p); 1660 1661 void yield(void); 1662 1663 /* 1664 * The default (Linux) execution domain. 1665 */ 1666 extern struct exec_domain default_exec_domain; 1667 1668 union thread_union { 1669 struct thread_info thread_info; 1670 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1671 }; 1672 1673 #ifndef __HAVE_ARCH_KSTACK_END 1674 static inline int kstack_end(void *addr) 1675 { 1676 /* Reliable end of stack detection: 1677 * Some APM bios versions misalign the stack 1678 */ 1679 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1680 } 1681 #endif 1682 1683 extern union thread_union init_thread_union; 1684 extern struct task_struct init_task; 1685 1686 extern struct mm_struct init_mm; 1687 1688 extern struct pid_namespace init_pid_ns; 1689 1690 /* 1691 * find a task by one of its numerical ids 1692 * 1693 * find_task_by_pid_type_ns(): 1694 * it is the most generic call - it finds a task by all id, 1695 * type and namespace specified 1696 * find_task_by_pid_ns(): 1697 * finds a task by its pid in the specified namespace 1698 * find_task_by_vpid(): 1699 * finds a task by its virtual pid 1700 * 1701 * see also find_vpid() etc in include/linux/pid.h 1702 */ 1703 1704 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid, 1705 struct pid_namespace *ns); 1706 1707 extern struct task_struct *find_task_by_vpid(pid_t nr); 1708 extern struct task_struct *find_task_by_pid_ns(pid_t nr, 1709 struct pid_namespace *ns); 1710 1711 extern void __set_special_pids(struct pid *pid); 1712 1713 /* per-UID process charging. */ 1714 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 1715 static inline struct user_struct *get_uid(struct user_struct *u) 1716 { 1717 atomic_inc(&u->__count); 1718 return u; 1719 } 1720 extern void free_uid(struct user_struct *); 1721 extern void switch_uid(struct user_struct *); 1722 extern void release_uids(struct user_namespace *ns); 1723 1724 #include <asm/current.h> 1725 1726 extern void do_timer(unsigned long ticks); 1727 1728 extern int wake_up_state(struct task_struct *tsk, unsigned int state); 1729 extern int wake_up_process(struct task_struct *tsk); 1730 extern void wake_up_new_task(struct task_struct *tsk, 1731 unsigned long clone_flags); 1732 #ifdef CONFIG_SMP 1733 extern void kick_process(struct task_struct *tsk); 1734 #else 1735 static inline void kick_process(struct task_struct *tsk) { } 1736 #endif 1737 extern void sched_fork(struct task_struct *p, int clone_flags); 1738 extern void sched_dead(struct task_struct *p); 1739 1740 extern int in_group_p(gid_t); 1741 extern int in_egroup_p(gid_t); 1742 1743 extern void proc_caches_init(void); 1744 extern void flush_signals(struct task_struct *); 1745 extern void ignore_signals(struct task_struct *); 1746 extern void flush_signal_handlers(struct task_struct *, int force_default); 1747 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 1748 1749 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 1750 { 1751 unsigned long flags; 1752 int ret; 1753 1754 spin_lock_irqsave(&tsk->sighand->siglock, flags); 1755 ret = dequeue_signal(tsk, mask, info); 1756 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 1757 1758 return ret; 1759 } 1760 1761 extern void block_all_signals(int (*notifier)(void *priv), void *priv, 1762 sigset_t *mask); 1763 extern void unblock_all_signals(void); 1764 extern void release_task(struct task_struct * p); 1765 extern int send_sig_info(int, struct siginfo *, struct task_struct *); 1766 extern int force_sigsegv(int, struct task_struct *); 1767 extern int force_sig_info(int, struct siginfo *, struct task_struct *); 1768 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1769 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 1770 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 1771 extern int kill_pgrp(struct pid *pid, int sig, int priv); 1772 extern int kill_pid(struct pid *pid, int sig, int priv); 1773 extern int kill_proc_info(int, struct siginfo *, pid_t); 1774 extern int do_notify_parent(struct task_struct *, int); 1775 extern void force_sig(int, struct task_struct *); 1776 extern void force_sig_specific(int, struct task_struct *); 1777 extern int send_sig(int, struct task_struct *, int); 1778 extern void zap_other_threads(struct task_struct *p); 1779 extern struct sigqueue *sigqueue_alloc(void); 1780 extern void sigqueue_free(struct sigqueue *); 1781 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); 1782 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 1783 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 1784 1785 static inline int kill_cad_pid(int sig, int priv) 1786 { 1787 return kill_pid(cad_pid, sig, priv); 1788 } 1789 1790 /* These can be the second arg to send_sig_info/send_group_sig_info. */ 1791 #define SEND_SIG_NOINFO ((struct siginfo *) 0) 1792 #define SEND_SIG_PRIV ((struct siginfo *) 1) 1793 #define SEND_SIG_FORCED ((struct siginfo *) 2) 1794 1795 static inline int is_si_special(const struct siginfo *info) 1796 { 1797 return info <= SEND_SIG_FORCED; 1798 } 1799 1800 /* True if we are on the alternate signal stack. */ 1801 1802 static inline int on_sig_stack(unsigned long sp) 1803 { 1804 return (sp - current->sas_ss_sp < current->sas_ss_size); 1805 } 1806 1807 static inline int sas_ss_flags(unsigned long sp) 1808 { 1809 return (current->sas_ss_size == 0 ? SS_DISABLE 1810 : on_sig_stack(sp) ? SS_ONSTACK : 0); 1811 } 1812 1813 /* 1814 * Routines for handling mm_structs 1815 */ 1816 extern struct mm_struct * mm_alloc(void); 1817 1818 /* mmdrop drops the mm and the page tables */ 1819 extern void __mmdrop(struct mm_struct *); 1820 static inline void mmdrop(struct mm_struct * mm) 1821 { 1822 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 1823 __mmdrop(mm); 1824 } 1825 1826 /* mmput gets rid of the mappings and all user-space */ 1827 extern void mmput(struct mm_struct *); 1828 /* Grab a reference to a task's mm, if it is not already going away */ 1829 extern struct mm_struct *get_task_mm(struct task_struct *task); 1830 /* Remove the current tasks stale references to the old mm_struct */ 1831 extern void mm_release(struct task_struct *, struct mm_struct *); 1832 /* Allocate a new mm structure and copy contents from tsk->mm */ 1833 extern struct mm_struct *dup_mm(struct task_struct *tsk); 1834 1835 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 1836 extern void flush_thread(void); 1837 extern void exit_thread(void); 1838 1839 extern void exit_files(struct task_struct *); 1840 extern void __cleanup_signal(struct signal_struct *); 1841 extern void __cleanup_sighand(struct sighand_struct *); 1842 1843 extern void exit_itimers(struct signal_struct *); 1844 extern void flush_itimer_signals(void); 1845 1846 extern NORET_TYPE void do_group_exit(int); 1847 1848 extern void daemonize(const char *, ...); 1849 extern int allow_signal(int); 1850 extern int disallow_signal(int); 1851 1852 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 1853 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 1854 struct task_struct *fork_idle(int); 1855 1856 extern void set_task_comm(struct task_struct *tsk, char *from); 1857 extern char *get_task_comm(char *to, struct task_struct *tsk); 1858 1859 #ifdef CONFIG_SMP 1860 extern unsigned long wait_task_inactive(struct task_struct *, long match_state); 1861 #else 1862 static inline unsigned long wait_task_inactive(struct task_struct *p, 1863 long match_state) 1864 { 1865 return 1; 1866 } 1867 #endif 1868 1869 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) 1870 1871 #define for_each_process(p) \ 1872 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 1873 1874 /* 1875 * Careful: do_each_thread/while_each_thread is a double loop so 1876 * 'break' will not work as expected - use goto instead. 1877 */ 1878 #define do_each_thread(g, t) \ 1879 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 1880 1881 #define while_each_thread(g, t) \ 1882 while ((t = next_thread(t)) != g) 1883 1884 /* de_thread depends on thread_group_leader not being a pid based check */ 1885 #define thread_group_leader(p) (p == p->group_leader) 1886 1887 /* Do to the insanities of de_thread it is possible for a process 1888 * to have the pid of the thread group leader without actually being 1889 * the thread group leader. For iteration through the pids in proc 1890 * all we care about is that we have a task with the appropriate 1891 * pid, we don't actually care if we have the right task. 1892 */ 1893 static inline int has_group_leader_pid(struct task_struct *p) 1894 { 1895 return p->pid == p->tgid; 1896 } 1897 1898 static inline 1899 int same_thread_group(struct task_struct *p1, struct task_struct *p2) 1900 { 1901 return p1->tgid == p2->tgid; 1902 } 1903 1904 static inline struct task_struct *next_thread(const struct task_struct *p) 1905 { 1906 return list_entry(rcu_dereference(p->thread_group.next), 1907 struct task_struct, thread_group); 1908 } 1909 1910 static inline int thread_group_empty(struct task_struct *p) 1911 { 1912 return list_empty(&p->thread_group); 1913 } 1914 1915 #define delay_group_leader(p) \ 1916 (thread_group_leader(p) && !thread_group_empty(p)) 1917 1918 /* 1919 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 1920 * subscriptions and synchronises with wait4(). Also used in procfs. Also 1921 * pins the final release of task.io_context. Also protects ->cpuset and 1922 * ->cgroup.subsys[]. 1923 * 1924 * Nests both inside and outside of read_lock(&tasklist_lock). 1925 * It must not be nested with write_lock_irq(&tasklist_lock), 1926 * neither inside nor outside. 1927 */ 1928 static inline void task_lock(struct task_struct *p) 1929 { 1930 spin_lock(&p->alloc_lock); 1931 } 1932 1933 static inline void task_unlock(struct task_struct *p) 1934 { 1935 spin_unlock(&p->alloc_lock); 1936 } 1937 1938 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 1939 unsigned long *flags); 1940 1941 static inline void unlock_task_sighand(struct task_struct *tsk, 1942 unsigned long *flags) 1943 { 1944 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 1945 } 1946 1947 #ifndef __HAVE_THREAD_FUNCTIONS 1948 1949 #define task_thread_info(task) ((struct thread_info *)(task)->stack) 1950 #define task_stack_page(task) ((task)->stack) 1951 1952 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 1953 { 1954 *task_thread_info(p) = *task_thread_info(org); 1955 task_thread_info(p)->task = p; 1956 } 1957 1958 static inline unsigned long *end_of_stack(struct task_struct *p) 1959 { 1960 return (unsigned long *)(task_thread_info(p) + 1); 1961 } 1962 1963 #endif 1964 1965 static inline int object_is_on_stack(void *obj) 1966 { 1967 void *stack = task_stack_page(current); 1968 1969 return (obj >= stack) && (obj < (stack + THREAD_SIZE)); 1970 } 1971 1972 extern void thread_info_cache_init(void); 1973 1974 /* set thread flags in other task's structures 1975 * - see asm/thread_info.h for TIF_xxxx flags available 1976 */ 1977 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 1978 { 1979 set_ti_thread_flag(task_thread_info(tsk), flag); 1980 } 1981 1982 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1983 { 1984 clear_ti_thread_flag(task_thread_info(tsk), flag); 1985 } 1986 1987 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 1988 { 1989 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 1990 } 1991 1992 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1993 { 1994 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 1995 } 1996 1997 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 1998 { 1999 return test_ti_thread_flag(task_thread_info(tsk), flag); 2000 } 2001 2002 static inline void set_tsk_need_resched(struct task_struct *tsk) 2003 { 2004 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2005 } 2006 2007 static inline void clear_tsk_need_resched(struct task_struct *tsk) 2008 { 2009 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2010 } 2011 2012 static inline int test_tsk_need_resched(struct task_struct *tsk) 2013 { 2014 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); 2015 } 2016 2017 static inline int signal_pending(struct task_struct *p) 2018 { 2019 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 2020 } 2021 2022 extern int __fatal_signal_pending(struct task_struct *p); 2023 2024 static inline int fatal_signal_pending(struct task_struct *p) 2025 { 2026 return signal_pending(p) && __fatal_signal_pending(p); 2027 } 2028 2029 static inline int signal_pending_state(long state, struct task_struct *p) 2030 { 2031 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) 2032 return 0; 2033 if (!signal_pending(p)) 2034 return 0; 2035 2036 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); 2037 } 2038 2039 static inline int need_resched(void) 2040 { 2041 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 2042 } 2043 2044 /* 2045 * cond_resched() and cond_resched_lock(): latency reduction via 2046 * explicit rescheduling in places that are safe. The return 2047 * value indicates whether a reschedule was done in fact. 2048 * cond_resched_lock() will drop the spinlock before scheduling, 2049 * cond_resched_softirq() will enable bhs before scheduling. 2050 */ 2051 extern int _cond_resched(void); 2052 #ifdef CONFIG_PREEMPT_BKL 2053 static inline int cond_resched(void) 2054 { 2055 return 0; 2056 } 2057 #else 2058 static inline int cond_resched(void) 2059 { 2060 return _cond_resched(); 2061 } 2062 #endif 2063 extern int cond_resched_lock(spinlock_t * lock); 2064 extern int cond_resched_softirq(void); 2065 static inline int cond_resched_bkl(void) 2066 { 2067 return _cond_resched(); 2068 } 2069 2070 /* 2071 * Does a critical section need to be broken due to another 2072 * task waiting?: (technically does not depend on CONFIG_PREEMPT, 2073 * but a general need for low latency) 2074 */ 2075 static inline int spin_needbreak(spinlock_t *lock) 2076 { 2077 #ifdef CONFIG_PREEMPT 2078 return spin_is_contended(lock); 2079 #else 2080 return 0; 2081 #endif 2082 } 2083 2084 /* 2085 * Reevaluate whether the task has signals pending delivery. 2086 * Wake the task if so. 2087 * This is required every time the blocked sigset_t changes. 2088 * callers must hold sighand->siglock. 2089 */ 2090 extern void recalc_sigpending_and_wake(struct task_struct *t); 2091 extern void recalc_sigpending(void); 2092 2093 extern void signal_wake_up(struct task_struct *t, int resume_stopped); 2094 2095 /* 2096 * Wrappers for p->thread_info->cpu access. No-op on UP. 2097 */ 2098 #ifdef CONFIG_SMP 2099 2100 static inline unsigned int task_cpu(const struct task_struct *p) 2101 { 2102 return task_thread_info(p)->cpu; 2103 } 2104 2105 extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 2106 2107 #else 2108 2109 static inline unsigned int task_cpu(const struct task_struct *p) 2110 { 2111 return 0; 2112 } 2113 2114 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 2115 { 2116 } 2117 2118 #endif /* CONFIG_SMP */ 2119 2120 extern void arch_pick_mmap_layout(struct mm_struct *mm); 2121 2122 #ifdef CONFIG_TRACING 2123 extern void 2124 __trace_special(void *__tr, void *__data, 2125 unsigned long arg1, unsigned long arg2, unsigned long arg3); 2126 #else 2127 static inline void 2128 __trace_special(void *__tr, void *__data, 2129 unsigned long arg1, unsigned long arg2, unsigned long arg3) 2130 { 2131 } 2132 #endif 2133 2134 extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask); 2135 extern long sched_getaffinity(pid_t pid, cpumask_t *mask); 2136 2137 extern int sched_mc_power_savings, sched_smt_power_savings; 2138 2139 extern void normalize_rt_tasks(void); 2140 2141 #ifdef CONFIG_GROUP_SCHED 2142 2143 extern struct task_group init_task_group; 2144 #ifdef CONFIG_USER_SCHED 2145 extern struct task_group root_task_group; 2146 #endif 2147 2148 extern struct task_group *sched_create_group(struct task_group *parent); 2149 extern void sched_destroy_group(struct task_group *tg); 2150 extern void sched_move_task(struct task_struct *tsk); 2151 #ifdef CONFIG_FAIR_GROUP_SCHED 2152 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 2153 extern unsigned long sched_group_shares(struct task_group *tg); 2154 #endif 2155 #ifdef CONFIG_RT_GROUP_SCHED 2156 extern int sched_group_set_rt_runtime(struct task_group *tg, 2157 long rt_runtime_us); 2158 extern long sched_group_rt_runtime(struct task_group *tg); 2159 extern int sched_group_set_rt_period(struct task_group *tg, 2160 long rt_period_us); 2161 extern long sched_group_rt_period(struct task_group *tg); 2162 #endif 2163 #endif 2164 2165 #ifdef CONFIG_TASK_XACCT 2166 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2167 { 2168 tsk->ioac.rchar += amt; 2169 } 2170 2171 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2172 { 2173 tsk->ioac.wchar += amt; 2174 } 2175 2176 static inline void inc_syscr(struct task_struct *tsk) 2177 { 2178 tsk->ioac.syscr++; 2179 } 2180 2181 static inline void inc_syscw(struct task_struct *tsk) 2182 { 2183 tsk->ioac.syscw++; 2184 } 2185 #else 2186 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2187 { 2188 } 2189 2190 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2191 { 2192 } 2193 2194 static inline void inc_syscr(struct task_struct *tsk) 2195 { 2196 } 2197 2198 static inline void inc_syscw(struct task_struct *tsk) 2199 { 2200 } 2201 #endif 2202 2203 #ifndef TASK_SIZE_OF 2204 #define TASK_SIZE_OF(tsk) TASK_SIZE 2205 #endif 2206 2207 #ifdef CONFIG_MM_OWNER 2208 extern void mm_update_next_owner(struct mm_struct *mm); 2209 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); 2210 #else 2211 static inline void mm_update_next_owner(struct mm_struct *mm) 2212 { 2213 } 2214 2215 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) 2216 { 2217 } 2218 #endif /* CONFIG_MM_OWNER */ 2219 2220 #define TASK_STATE_TO_CHAR_STR "RSDTtZX" 2221 2222 #endif /* __KERNEL__ */ 2223 2224 #endif 2225