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 struct bts_tracer; 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); 139 140 struct seq_file; 141 struct cfs_rq; 142 struct task_group; 143 #ifdef CONFIG_SCHED_DEBUG 144 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 145 extern void proc_sched_set_task(struct task_struct *p); 146 extern void 147 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 148 #else 149 static inline void 150 proc_sched_show_task(struct task_struct *p, struct seq_file *m) 151 { 152 } 153 static inline void proc_sched_set_task(struct task_struct *p) 154 { 155 } 156 static inline void 157 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 158 { 159 } 160 #endif 161 162 extern unsigned long long time_sync_thresh; 163 164 /* 165 * Task state bitmask. NOTE! These bits are also 166 * encoded in fs/proc/array.c: get_task_state(). 167 * 168 * We have two separate sets of flags: task->state 169 * is about runnability, while task->exit_state are 170 * about the task exiting. Confusing, but this way 171 * modifying one set can't modify the other one by 172 * mistake. 173 */ 174 #define TASK_RUNNING 0 175 #define TASK_INTERRUPTIBLE 1 176 #define TASK_UNINTERRUPTIBLE 2 177 #define __TASK_STOPPED 4 178 #define __TASK_TRACED 8 179 /* in tsk->exit_state */ 180 #define EXIT_ZOMBIE 16 181 #define EXIT_DEAD 32 182 /* in tsk->state again */ 183 #define TASK_DEAD 64 184 #define TASK_WAKEKILL 128 185 186 /* Convenience macros for the sake of set_task_state */ 187 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) 188 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) 189 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) 190 191 /* Convenience macros for the sake of wake_up */ 192 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 193 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) 194 195 /* get_task_state() */ 196 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ 197 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ 198 __TASK_TRACED) 199 200 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) 201 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) 202 #define task_is_stopped_or_traced(task) \ 203 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) 204 #define task_contributes_to_load(task) \ 205 ((task->state & TASK_UNINTERRUPTIBLE) != 0) 206 207 #define __set_task_state(tsk, state_value) \ 208 do { (tsk)->state = (state_value); } while (0) 209 #define set_task_state(tsk, state_value) \ 210 set_mb((tsk)->state, (state_value)) 211 212 /* 213 * set_current_state() includes a barrier so that the write of current->state 214 * is correctly serialised wrt the caller's subsequent test of whether to 215 * actually sleep: 216 * 217 * set_current_state(TASK_UNINTERRUPTIBLE); 218 * if (do_i_need_to_sleep()) 219 * schedule(); 220 * 221 * If the caller does not need such serialisation then use __set_current_state() 222 */ 223 #define __set_current_state(state_value) \ 224 do { current->state = (state_value); } while (0) 225 #define set_current_state(state_value) \ 226 set_mb(current->state, (state_value)) 227 228 /* Task command name length */ 229 #define TASK_COMM_LEN 16 230 231 #include <linux/spinlock.h> 232 233 /* 234 * This serializes "schedule()" and also protects 235 * the run-queue from deletions/modifications (but 236 * _adding_ to the beginning of the run-queue has 237 * a separate lock). 238 */ 239 extern rwlock_t tasklist_lock; 240 extern spinlock_t mmlist_lock; 241 242 struct task_struct; 243 244 extern void sched_init(void); 245 extern void sched_init_smp(void); 246 extern asmlinkage void schedule_tail(struct task_struct *prev); 247 extern void init_idle(struct task_struct *idle, int cpu); 248 extern void init_idle_bootup_task(struct task_struct *idle); 249 250 extern int runqueue_is_locked(void); 251 extern void task_rq_unlock_wait(struct task_struct *p); 252 253 extern cpumask_var_t nohz_cpu_mask; 254 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 255 extern int select_nohz_load_balancer(int cpu); 256 #else 257 static inline int select_nohz_load_balancer(int cpu) 258 { 259 return 0; 260 } 261 #endif 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 update_process_times(int user); 288 extern void scheduler_tick(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 touch_softlockup_watchdog(void); 295 extern void touch_all_softlockup_watchdogs(void); 296 extern unsigned int softlockup_panic; 297 extern unsigned long sysctl_hung_task_check_count; 298 extern unsigned long sysctl_hung_task_timeout_secs; 299 extern unsigned long sysctl_hung_task_warnings; 300 extern int softlockup_thresh; 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 USE_SPLIT_PTLOCKS 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 /* !USE_SPLIT_PTLOCKS */ 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 /* !USE_SPLIT_PTLOCKS */ 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 #define get_mm_hiwater_rss(mm) max((mm)->hiwater_rss, get_mm_rss(mm)) 390 #define get_mm_hiwater_vm(mm) max((mm)->hiwater_vm, (mm)->total_vm) 391 392 extern void set_dumpable(struct mm_struct *mm, int value); 393 extern int get_dumpable(struct mm_struct *mm); 394 395 /* mm flags */ 396 /* dumpable bits */ 397 #define MMF_DUMPABLE 0 /* core dump is permitted */ 398 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 399 #define MMF_DUMPABLE_BITS 2 400 401 /* coredump filter bits */ 402 #define MMF_DUMP_ANON_PRIVATE 2 403 #define MMF_DUMP_ANON_SHARED 3 404 #define MMF_DUMP_MAPPED_PRIVATE 4 405 #define MMF_DUMP_MAPPED_SHARED 5 406 #define MMF_DUMP_ELF_HEADERS 6 407 #define MMF_DUMP_HUGETLB_PRIVATE 7 408 #define MMF_DUMP_HUGETLB_SHARED 8 409 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 410 #define MMF_DUMP_FILTER_BITS 7 411 #define MMF_DUMP_FILTER_MASK \ 412 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 413 #define MMF_DUMP_FILTER_DEFAULT \ 414 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ 415 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) 416 417 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS 418 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) 419 #else 420 # define MMF_DUMP_MASK_DEFAULT_ELF 0 421 #endif 422 423 struct sighand_struct { 424 atomic_t count; 425 struct k_sigaction action[_NSIG]; 426 spinlock_t siglock; 427 wait_queue_head_t signalfd_wqh; 428 }; 429 430 struct pacct_struct { 431 int ac_flag; 432 long ac_exitcode; 433 unsigned long ac_mem; 434 cputime_t ac_utime, ac_stime; 435 unsigned long ac_minflt, ac_majflt; 436 }; 437 438 /** 439 * struct task_cputime - collected CPU time counts 440 * @utime: time spent in user mode, in &cputime_t units 441 * @stime: time spent in kernel mode, in &cputime_t units 442 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds 443 * 444 * This structure groups together three kinds of CPU time that are 445 * tracked for threads and thread groups. Most things considering 446 * CPU time want to group these counts together and treat all three 447 * of them in parallel. 448 */ 449 struct task_cputime { 450 cputime_t utime; 451 cputime_t stime; 452 unsigned long long sum_exec_runtime; 453 }; 454 /* Alternate field names when used to cache expirations. */ 455 #define prof_exp stime 456 #define virt_exp utime 457 #define sched_exp sum_exec_runtime 458 459 /** 460 * struct thread_group_cputime - thread group interval timer counts 461 * @totals: thread group interval timers; substructure for 462 * uniprocessor kernel, per-cpu for SMP kernel. 463 * 464 * This structure contains the version of task_cputime, above, that is 465 * used for thread group CPU clock calculations. 466 */ 467 struct thread_group_cputime { 468 struct task_cputime *totals; 469 }; 470 471 /* 472 * NOTE! "signal_struct" does not have it's own 473 * locking, because a shared signal_struct always 474 * implies a shared sighand_struct, so locking 475 * sighand_struct is always a proper superset of 476 * the locking of signal_struct. 477 */ 478 struct signal_struct { 479 atomic_t count; 480 atomic_t live; 481 482 wait_queue_head_t wait_chldexit; /* for wait4() */ 483 484 /* current thread group signal load-balancing target: */ 485 struct task_struct *curr_target; 486 487 /* shared signal handling: */ 488 struct sigpending shared_pending; 489 490 /* thread group exit support */ 491 int group_exit_code; 492 /* overloaded: 493 * - notify group_exit_task when ->count is equal to notify_count 494 * - everyone except group_exit_task is stopped during signal delivery 495 * of fatal signals, group_exit_task processes the signal. 496 */ 497 int notify_count; 498 struct task_struct *group_exit_task; 499 500 /* thread group stop support, overloads group_exit_code too */ 501 int group_stop_count; 502 unsigned int flags; /* see SIGNAL_* flags below */ 503 504 /* POSIX.1b Interval Timers */ 505 struct list_head posix_timers; 506 507 /* ITIMER_REAL timer for the process */ 508 struct hrtimer real_timer; 509 struct pid *leader_pid; 510 ktime_t it_real_incr; 511 512 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 513 cputime_t it_prof_expires, it_virt_expires; 514 cputime_t it_prof_incr, it_virt_incr; 515 516 /* 517 * Thread group totals for process CPU clocks. 518 * See thread_group_cputime(), et al, for details. 519 */ 520 struct thread_group_cputime cputime; 521 522 /* Earliest-expiration cache. */ 523 struct task_cputime cputime_expires; 524 525 struct list_head cpu_timers[3]; 526 527 /* job control IDs */ 528 529 /* 530 * pgrp and session fields are deprecated. 531 * use the task_session_Xnr and task_pgrp_Xnr routines below 532 */ 533 534 union { 535 pid_t pgrp __deprecated; 536 pid_t __pgrp; 537 }; 538 539 struct pid *tty_old_pgrp; 540 541 union { 542 pid_t session __deprecated; 543 pid_t __session; 544 }; 545 546 /* boolean value for session group leader */ 547 int leader; 548 549 struct tty_struct *tty; /* NULL if no tty */ 550 551 /* 552 * Cumulative resource counters for dead threads in the group, 553 * and for reaped dead child processes forked by this group. 554 * Live threads maintain their own counters and add to these 555 * in __exit_signal, except for the group leader. 556 */ 557 cputime_t cutime, cstime; 558 cputime_t gtime; 559 cputime_t cgtime; 560 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 561 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 562 unsigned long inblock, oublock, cinblock, coublock; 563 struct task_io_accounting ioac; 564 565 /* 566 * We don't bother to synchronize most readers of this at all, 567 * because there is no reader checking a limit that actually needs 568 * to get both rlim_cur and rlim_max atomically, and either one 569 * alone is a single word that can safely be read normally. 570 * getrlimit/setrlimit use task_lock(current->group_leader) to 571 * protect this instead of the siglock, because they really 572 * have no need to disable irqs. 573 */ 574 struct rlimit rlim[RLIM_NLIMITS]; 575 576 #ifdef CONFIG_BSD_PROCESS_ACCT 577 struct pacct_struct pacct; /* per-process accounting information */ 578 #endif 579 #ifdef CONFIG_TASKSTATS 580 struct taskstats *stats; 581 #endif 582 #ifdef CONFIG_AUDIT 583 unsigned audit_tty; 584 struct tty_audit_buf *tty_audit_buf; 585 #endif 586 }; 587 588 /* Context switch must be unlocked if interrupts are to be enabled */ 589 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 590 # define __ARCH_WANT_UNLOCKED_CTXSW 591 #endif 592 593 /* 594 * Bits in flags field of signal_struct. 595 */ 596 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 597 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 598 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 599 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 600 /* 601 * Pending notifications to parent. 602 */ 603 #define SIGNAL_CLD_STOPPED 0x00000010 604 #define SIGNAL_CLD_CONTINUED 0x00000020 605 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) 606 607 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ 608 609 /* If true, all threads except ->group_exit_task have pending SIGKILL */ 610 static inline int signal_group_exit(const struct signal_struct *sig) 611 { 612 return (sig->flags & SIGNAL_GROUP_EXIT) || 613 (sig->group_exit_task != NULL); 614 } 615 616 /* 617 * Some day this will be a full-fledged user tracking system.. 618 */ 619 struct user_struct { 620 atomic_t __count; /* reference count */ 621 atomic_t processes; /* How many processes does this user have? */ 622 atomic_t files; /* How many open files does this user have? */ 623 atomic_t sigpending; /* How many pending signals does this user have? */ 624 #ifdef CONFIG_INOTIFY_USER 625 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 626 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 627 #endif 628 #ifdef CONFIG_EPOLL 629 atomic_t epoll_devs; /* The number of epoll descriptors currently open */ 630 atomic_t epoll_watches; /* The number of file descriptors currently watched */ 631 #endif 632 #ifdef CONFIG_POSIX_MQUEUE 633 /* protected by mq_lock */ 634 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 635 #endif 636 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 637 638 #ifdef CONFIG_KEYS 639 struct key *uid_keyring; /* UID specific keyring */ 640 struct key *session_keyring; /* UID's default session keyring */ 641 #endif 642 643 /* Hash table maintenance information */ 644 struct hlist_node uidhash_node; 645 uid_t uid; 646 struct user_namespace *user_ns; 647 648 #ifdef CONFIG_USER_SCHED 649 struct task_group *tg; 650 #ifdef CONFIG_SYSFS 651 struct kobject kobj; 652 struct work_struct work; 653 #endif 654 #endif 655 }; 656 657 extern int uids_sysfs_init(void); 658 659 extern struct user_struct *find_user(uid_t); 660 661 extern struct user_struct root_user; 662 #define INIT_USER (&root_user) 663 664 665 struct backing_dev_info; 666 struct reclaim_state; 667 668 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 669 struct sched_info { 670 /* cumulative counters */ 671 unsigned long pcount; /* # of times run on this cpu */ 672 unsigned long long run_delay; /* time spent waiting on a runqueue */ 673 674 /* timestamps */ 675 unsigned long long last_arrival,/* when we last ran on a cpu */ 676 last_queued; /* when we were last queued to run */ 677 #ifdef CONFIG_SCHEDSTATS 678 /* BKL stats */ 679 unsigned int bkl_count; 680 #endif 681 }; 682 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 683 684 #ifdef CONFIG_TASK_DELAY_ACCT 685 struct task_delay_info { 686 spinlock_t lock; 687 unsigned int flags; /* Private per-task flags */ 688 689 /* For each stat XXX, add following, aligned appropriately 690 * 691 * struct timespec XXX_start, XXX_end; 692 * u64 XXX_delay; 693 * u32 XXX_count; 694 * 695 * Atomicity of updates to XXX_delay, XXX_count protected by 696 * single lock above (split into XXX_lock if contention is an issue). 697 */ 698 699 /* 700 * XXX_count is incremented on every XXX operation, the delay 701 * associated with the operation is added to XXX_delay. 702 * XXX_delay contains the accumulated delay time in nanoseconds. 703 */ 704 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 705 u64 blkio_delay; /* wait for sync block io completion */ 706 u64 swapin_delay; /* wait for swapin block io completion */ 707 u32 blkio_count; /* total count of the number of sync block */ 708 /* io operations performed */ 709 u32 swapin_count; /* total count of the number of swapin block */ 710 /* io operations performed */ 711 712 struct timespec freepages_start, freepages_end; 713 u64 freepages_delay; /* wait for memory reclaim */ 714 u32 freepages_count; /* total count of memory reclaim */ 715 }; 716 #endif /* CONFIG_TASK_DELAY_ACCT */ 717 718 static inline int sched_info_on(void) 719 { 720 #ifdef CONFIG_SCHEDSTATS 721 return 1; 722 #elif defined(CONFIG_TASK_DELAY_ACCT) 723 extern int delayacct_on; 724 return delayacct_on; 725 #else 726 return 0; 727 #endif 728 } 729 730 enum cpu_idle_type { 731 CPU_IDLE, 732 CPU_NOT_IDLE, 733 CPU_NEWLY_IDLE, 734 CPU_MAX_IDLE_TYPES 735 }; 736 737 /* 738 * sched-domains (multiprocessor balancing) declarations: 739 */ 740 741 /* 742 * Increase resolution of nice-level calculations: 743 */ 744 #define SCHED_LOAD_SHIFT 10 745 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 746 747 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE 748 749 #ifdef CONFIG_SMP 750 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 751 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 752 #define SD_BALANCE_EXEC 4 /* Balance on exec */ 753 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 754 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 755 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 756 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 757 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 758 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ 759 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ 760 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */ 761 #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */ 762 763 enum powersavings_balance_level { 764 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ 765 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package 766 * first for long running threads 767 */ 768 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle 769 * cpu package for power savings 770 */ 771 MAX_POWERSAVINGS_BALANCE_LEVELS 772 }; 773 774 extern int sched_mc_power_savings, sched_smt_power_savings; 775 776 static inline int sd_balance_for_mc_power(void) 777 { 778 if (sched_smt_power_savings) 779 return SD_POWERSAVINGS_BALANCE; 780 781 return 0; 782 } 783 784 static inline int sd_balance_for_package_power(void) 785 { 786 if (sched_mc_power_savings | sched_smt_power_savings) 787 return SD_POWERSAVINGS_BALANCE; 788 789 return 0; 790 } 791 792 /* 793 * Optimise SD flags for power savings: 794 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings. 795 * Keep default SD flags if sched_{smt,mc}_power_saving=0 796 */ 797 798 static inline int sd_power_saving_flags(void) 799 { 800 if (sched_mc_power_savings | sched_smt_power_savings) 801 return SD_BALANCE_NEWIDLE; 802 803 return 0; 804 } 805 806 struct sched_group { 807 struct sched_group *next; /* Must be a circular list */ 808 809 /* 810 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 811 * single CPU. This is read only (except for setup, hotplug CPU). 812 * Note : Never change cpu_power without recompute its reciprocal 813 */ 814 unsigned int __cpu_power; 815 /* 816 * reciprocal value of cpu_power to avoid expensive divides 817 * (see include/linux/reciprocal_div.h) 818 */ 819 u32 reciprocal_cpu_power; 820 821 unsigned long cpumask[]; 822 }; 823 824 static inline struct cpumask *sched_group_cpus(struct sched_group *sg) 825 { 826 return to_cpumask(sg->cpumask); 827 } 828 829 enum sched_domain_level { 830 SD_LV_NONE = 0, 831 SD_LV_SIBLING, 832 SD_LV_MC, 833 SD_LV_CPU, 834 SD_LV_NODE, 835 SD_LV_ALLNODES, 836 SD_LV_MAX 837 }; 838 839 struct sched_domain_attr { 840 int relax_domain_level; 841 }; 842 843 #define SD_ATTR_INIT (struct sched_domain_attr) { \ 844 .relax_domain_level = -1, \ 845 } 846 847 struct sched_domain { 848 /* These fields must be setup */ 849 struct sched_domain *parent; /* top domain must be null terminated */ 850 struct sched_domain *child; /* bottom domain must be null terminated */ 851 struct sched_group *groups; /* the balancing groups of the domain */ 852 unsigned long min_interval; /* Minimum balance interval ms */ 853 unsigned long max_interval; /* Maximum balance interval ms */ 854 unsigned int busy_factor; /* less balancing by factor if busy */ 855 unsigned int imbalance_pct; /* No balance until over watermark */ 856 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 857 unsigned int busy_idx; 858 unsigned int idle_idx; 859 unsigned int newidle_idx; 860 unsigned int wake_idx; 861 unsigned int forkexec_idx; 862 int flags; /* See SD_* */ 863 enum sched_domain_level level; 864 865 /* Runtime fields. */ 866 unsigned long last_balance; /* init to jiffies. units in jiffies */ 867 unsigned int balance_interval; /* initialise to 1. units in ms. */ 868 unsigned int nr_balance_failed; /* initialise to 0 */ 869 870 u64 last_update; 871 872 #ifdef CONFIG_SCHEDSTATS 873 /* load_balance() stats */ 874 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 875 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 876 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 877 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 878 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 879 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 880 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 881 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 882 883 /* Active load balancing */ 884 unsigned int alb_count; 885 unsigned int alb_failed; 886 unsigned int alb_pushed; 887 888 /* SD_BALANCE_EXEC stats */ 889 unsigned int sbe_count; 890 unsigned int sbe_balanced; 891 unsigned int sbe_pushed; 892 893 /* SD_BALANCE_FORK stats */ 894 unsigned int sbf_count; 895 unsigned int sbf_balanced; 896 unsigned int sbf_pushed; 897 898 /* try_to_wake_up() stats */ 899 unsigned int ttwu_wake_remote; 900 unsigned int ttwu_move_affine; 901 unsigned int ttwu_move_balance; 902 #endif 903 #ifdef CONFIG_SCHED_DEBUG 904 char *name; 905 #endif 906 907 /* span of all CPUs in this domain */ 908 unsigned long span[]; 909 }; 910 911 static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 912 { 913 return to_cpumask(sd->span); 914 } 915 916 extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new, 917 struct sched_domain_attr *dattr_new); 918 919 /* Test a flag in parent sched domain */ 920 static inline int test_sd_parent(struct sched_domain *sd, int flag) 921 { 922 if (sd->parent && (sd->parent->flags & flag)) 923 return 1; 924 925 return 0; 926 } 927 928 #else /* CONFIG_SMP */ 929 930 struct sched_domain_attr; 931 932 static inline void 933 partition_sched_domains(int ndoms_new, struct cpumask *doms_new, 934 struct sched_domain_attr *dattr_new) 935 { 936 } 937 #endif /* !CONFIG_SMP */ 938 939 struct io_context; /* See blkdev.h */ 940 941 942 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 943 extern void prefetch_stack(struct task_struct *t); 944 #else 945 static inline void prefetch_stack(struct task_struct *t) { } 946 #endif 947 948 struct audit_context; /* See audit.c */ 949 struct mempolicy; 950 struct pipe_inode_info; 951 struct uts_namespace; 952 953 struct rq; 954 struct sched_domain; 955 956 struct sched_class { 957 const struct sched_class *next; 958 959 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); 960 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); 961 void (*yield_task) (struct rq *rq); 962 963 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync); 964 965 struct task_struct * (*pick_next_task) (struct rq *rq); 966 void (*put_prev_task) (struct rq *rq, struct task_struct *p); 967 968 #ifdef CONFIG_SMP 969 int (*select_task_rq)(struct task_struct *p, int sync); 970 971 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, 972 struct rq *busiest, unsigned long max_load_move, 973 struct sched_domain *sd, enum cpu_idle_type idle, 974 int *all_pinned, int *this_best_prio); 975 976 int (*move_one_task) (struct rq *this_rq, int this_cpu, 977 struct rq *busiest, struct sched_domain *sd, 978 enum cpu_idle_type idle); 979 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); 980 void (*post_schedule) (struct rq *this_rq); 981 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task); 982 983 void (*set_cpus_allowed)(struct task_struct *p, 984 const struct cpumask *newmask); 985 986 void (*rq_online)(struct rq *rq); 987 void (*rq_offline)(struct rq *rq); 988 #endif 989 990 void (*set_curr_task) (struct rq *rq); 991 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 992 void (*task_new) (struct rq *rq, struct task_struct *p); 993 994 void (*switched_from) (struct rq *this_rq, struct task_struct *task, 995 int running); 996 void (*switched_to) (struct rq *this_rq, struct task_struct *task, 997 int running); 998 void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 999 int oldprio, int running); 1000 1001 #ifdef CONFIG_FAIR_GROUP_SCHED 1002 void (*moved_group) (struct task_struct *p); 1003 #endif 1004 }; 1005 1006 struct load_weight { 1007 unsigned long weight, inv_weight; 1008 }; 1009 1010 /* 1011 * CFS stats for a schedulable entity (task, task-group etc) 1012 * 1013 * Current field usage histogram: 1014 * 1015 * 4 se->block_start 1016 * 4 se->run_node 1017 * 4 se->sleep_start 1018 * 6 se->load.weight 1019 */ 1020 struct sched_entity { 1021 struct load_weight load; /* for load-balancing */ 1022 struct rb_node run_node; 1023 struct list_head group_node; 1024 unsigned int on_rq; 1025 1026 u64 exec_start; 1027 u64 sum_exec_runtime; 1028 u64 vruntime; 1029 u64 prev_sum_exec_runtime; 1030 1031 u64 last_wakeup; 1032 u64 avg_overlap; 1033 1034 #ifdef CONFIG_SCHEDSTATS 1035 u64 wait_start; 1036 u64 wait_max; 1037 u64 wait_count; 1038 u64 wait_sum; 1039 1040 u64 sleep_start; 1041 u64 sleep_max; 1042 s64 sum_sleep_runtime; 1043 1044 u64 block_start; 1045 u64 block_max; 1046 u64 exec_max; 1047 u64 slice_max; 1048 1049 u64 nr_migrations; 1050 u64 nr_migrations_cold; 1051 u64 nr_failed_migrations_affine; 1052 u64 nr_failed_migrations_running; 1053 u64 nr_failed_migrations_hot; 1054 u64 nr_forced_migrations; 1055 u64 nr_forced2_migrations; 1056 1057 u64 nr_wakeups; 1058 u64 nr_wakeups_sync; 1059 u64 nr_wakeups_migrate; 1060 u64 nr_wakeups_local; 1061 u64 nr_wakeups_remote; 1062 u64 nr_wakeups_affine; 1063 u64 nr_wakeups_affine_attempts; 1064 u64 nr_wakeups_passive; 1065 u64 nr_wakeups_idle; 1066 #endif 1067 1068 #ifdef CONFIG_FAIR_GROUP_SCHED 1069 struct sched_entity *parent; 1070 /* rq on which this entity is (to be) queued: */ 1071 struct cfs_rq *cfs_rq; 1072 /* rq "owned" by this entity/group: */ 1073 struct cfs_rq *my_q; 1074 #endif 1075 }; 1076 1077 struct sched_rt_entity { 1078 struct list_head run_list; 1079 unsigned long timeout; 1080 unsigned int time_slice; 1081 int nr_cpus_allowed; 1082 1083 struct sched_rt_entity *back; 1084 #ifdef CONFIG_RT_GROUP_SCHED 1085 struct sched_rt_entity *parent; 1086 /* rq on which this entity is (to be) queued: */ 1087 struct rt_rq *rt_rq; 1088 /* rq "owned" by this entity/group: */ 1089 struct rt_rq *my_q; 1090 #endif 1091 }; 1092 1093 struct task_struct { 1094 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 1095 void *stack; 1096 atomic_t usage; 1097 unsigned int flags; /* per process flags, defined below */ 1098 unsigned int ptrace; 1099 1100 int lock_depth; /* BKL lock depth */ 1101 1102 #ifdef CONFIG_SMP 1103 #ifdef __ARCH_WANT_UNLOCKED_CTXSW 1104 int oncpu; 1105 #endif 1106 #endif 1107 1108 int prio, static_prio, normal_prio; 1109 unsigned int rt_priority; 1110 const struct sched_class *sched_class; 1111 struct sched_entity se; 1112 struct sched_rt_entity rt; 1113 1114 #ifdef CONFIG_PREEMPT_NOTIFIERS 1115 /* list of struct preempt_notifier: */ 1116 struct hlist_head preempt_notifiers; 1117 #endif 1118 1119 /* 1120 * fpu_counter contains the number of consecutive context switches 1121 * that the FPU is used. If this is over a threshold, the lazy fpu 1122 * saving becomes unlazy to save the trap. This is an unsigned char 1123 * so that after 256 times the counter wraps and the behavior turns 1124 * lazy again; this to deal with bursty apps that only use FPU for 1125 * a short time 1126 */ 1127 unsigned char fpu_counter; 1128 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ 1129 #ifdef CONFIG_BLK_DEV_IO_TRACE 1130 unsigned int btrace_seq; 1131 #endif 1132 1133 unsigned int policy; 1134 cpumask_t cpus_allowed; 1135 1136 #ifdef CONFIG_PREEMPT_RCU 1137 int rcu_read_lock_nesting; 1138 int rcu_flipctr_idx; 1139 #endif /* #ifdef CONFIG_PREEMPT_RCU */ 1140 1141 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 1142 struct sched_info sched_info; 1143 #endif 1144 1145 struct list_head tasks; 1146 1147 struct mm_struct *mm, *active_mm; 1148 1149 /* task state */ 1150 struct linux_binfmt *binfmt; 1151 int exit_state; 1152 int exit_code, exit_signal; 1153 int pdeath_signal; /* The signal sent when the parent dies */ 1154 /* ??? */ 1155 unsigned int personality; 1156 unsigned did_exec:1; 1157 pid_t pid; 1158 pid_t tgid; 1159 1160 #ifdef CONFIG_CC_STACKPROTECTOR 1161 /* Canary value for the -fstack-protector gcc feature */ 1162 unsigned long stack_canary; 1163 #endif 1164 /* 1165 * pointers to (original) parent process, youngest child, younger sibling, 1166 * older sibling, respectively. (p->father can be replaced with 1167 * p->real_parent->pid) 1168 */ 1169 struct task_struct *real_parent; /* real parent process */ 1170 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ 1171 /* 1172 * children/sibling forms the list of my natural children 1173 */ 1174 struct list_head children; /* list of my children */ 1175 struct list_head sibling; /* linkage in my parent's children list */ 1176 struct task_struct *group_leader; /* threadgroup leader */ 1177 1178 /* 1179 * ptraced is the list of tasks this task is using ptrace on. 1180 * This includes both natural children and PTRACE_ATTACH targets. 1181 * p->ptrace_entry is p's link on the p->parent->ptraced list. 1182 */ 1183 struct list_head ptraced; 1184 struct list_head ptrace_entry; 1185 1186 #ifdef CONFIG_X86_PTRACE_BTS 1187 /* 1188 * This is the tracer handle for the ptrace BTS extension. 1189 * This field actually belongs to the ptracer task. 1190 */ 1191 struct bts_tracer *bts; 1192 /* 1193 * The buffer to hold the BTS data. 1194 */ 1195 void *bts_buffer; 1196 size_t bts_size; 1197 #endif /* CONFIG_X86_PTRACE_BTS */ 1198 1199 /* PID/PID hash table linkage. */ 1200 struct pid_link pids[PIDTYPE_MAX]; 1201 struct list_head thread_group; 1202 1203 struct completion *vfork_done; /* for vfork() */ 1204 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1205 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1206 1207 cputime_t utime, stime, utimescaled, stimescaled; 1208 cputime_t gtime; 1209 cputime_t prev_utime, prev_stime; 1210 unsigned long nvcsw, nivcsw; /* context switch counts */ 1211 struct timespec start_time; /* monotonic time */ 1212 struct timespec real_start_time; /* boot based time */ 1213 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1214 unsigned long min_flt, maj_flt; 1215 1216 struct task_cputime cputime_expires; 1217 struct list_head cpu_timers[3]; 1218 1219 /* process credentials */ 1220 const struct cred *real_cred; /* objective and real subjective task 1221 * credentials (COW) */ 1222 const struct cred *cred; /* effective (overridable) subjective task 1223 * credentials (COW) */ 1224 struct mutex cred_exec_mutex; /* execve vs ptrace cred calculation mutex */ 1225 1226 char comm[TASK_COMM_LEN]; /* executable name excluding path 1227 - access with [gs]et_task_comm (which lock 1228 it with task_lock()) 1229 - initialized normally by flush_old_exec */ 1230 /* file system info */ 1231 int link_count, total_link_count; 1232 #ifdef CONFIG_SYSVIPC 1233 /* ipc stuff */ 1234 struct sysv_sem sysvsem; 1235 #endif 1236 #ifdef CONFIG_DETECT_SOFTLOCKUP 1237 /* hung task detection */ 1238 unsigned long last_switch_timestamp; 1239 unsigned long last_switch_count; 1240 #endif 1241 /* CPU-specific state of this task */ 1242 struct thread_struct thread; 1243 /* filesystem information */ 1244 struct fs_struct *fs; 1245 /* open file information */ 1246 struct files_struct *files; 1247 /* namespaces */ 1248 struct nsproxy *nsproxy; 1249 /* signal handlers */ 1250 struct signal_struct *signal; 1251 struct sighand_struct *sighand; 1252 1253 sigset_t blocked, real_blocked; 1254 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ 1255 struct sigpending pending; 1256 1257 unsigned long sas_ss_sp; 1258 size_t sas_ss_size; 1259 int (*notifier)(void *priv); 1260 void *notifier_data; 1261 sigset_t *notifier_mask; 1262 struct audit_context *audit_context; 1263 #ifdef CONFIG_AUDITSYSCALL 1264 uid_t loginuid; 1265 unsigned int sessionid; 1266 #endif 1267 seccomp_t seccomp; 1268 1269 /* Thread group tracking */ 1270 u32 parent_exec_id; 1271 u32 self_exec_id; 1272 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 1273 spinlock_t alloc_lock; 1274 1275 /* Protection of the PI data structures: */ 1276 spinlock_t pi_lock; 1277 1278 #ifdef CONFIG_RT_MUTEXES 1279 /* PI waiters blocked on a rt_mutex held by this task */ 1280 struct plist_head pi_waiters; 1281 /* Deadlock detection and priority inheritance handling */ 1282 struct rt_mutex_waiter *pi_blocked_on; 1283 #endif 1284 1285 #ifdef CONFIG_DEBUG_MUTEXES 1286 /* mutex deadlock detection */ 1287 struct mutex_waiter *blocked_on; 1288 #endif 1289 #ifdef CONFIG_TRACE_IRQFLAGS 1290 unsigned int irq_events; 1291 int hardirqs_enabled; 1292 unsigned long hardirq_enable_ip; 1293 unsigned int hardirq_enable_event; 1294 unsigned long hardirq_disable_ip; 1295 unsigned int hardirq_disable_event; 1296 int softirqs_enabled; 1297 unsigned long softirq_disable_ip; 1298 unsigned int softirq_disable_event; 1299 unsigned long softirq_enable_ip; 1300 unsigned int softirq_enable_event; 1301 int hardirq_context; 1302 int softirq_context; 1303 #endif 1304 #ifdef CONFIG_LOCKDEP 1305 # define MAX_LOCK_DEPTH 48UL 1306 u64 curr_chain_key; 1307 int lockdep_depth; 1308 unsigned int lockdep_recursion; 1309 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1310 #endif 1311 1312 /* journalling filesystem info */ 1313 void *journal_info; 1314 1315 /* stacked block device info */ 1316 struct bio *bio_list, **bio_tail; 1317 1318 /* VM state */ 1319 struct reclaim_state *reclaim_state; 1320 1321 struct backing_dev_info *backing_dev_info; 1322 1323 struct io_context *io_context; 1324 1325 unsigned long ptrace_message; 1326 siginfo_t *last_siginfo; /* For ptrace use. */ 1327 struct task_io_accounting ioac; 1328 #if defined(CONFIG_TASK_XACCT) 1329 u64 acct_rss_mem1; /* accumulated rss usage */ 1330 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1331 cputime_t acct_timexpd; /* stime + utime since last update */ 1332 #endif 1333 #ifdef CONFIG_CPUSETS 1334 nodemask_t mems_allowed; 1335 int cpuset_mems_generation; 1336 int cpuset_mem_spread_rotor; 1337 #endif 1338 #ifdef CONFIG_CGROUPS 1339 /* Control Group info protected by css_set_lock */ 1340 struct css_set *cgroups; 1341 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1342 struct list_head cg_list; 1343 #endif 1344 #ifdef CONFIG_FUTEX 1345 struct robust_list_head __user *robust_list; 1346 #ifdef CONFIG_COMPAT 1347 struct compat_robust_list_head __user *compat_robust_list; 1348 #endif 1349 struct list_head pi_state_list; 1350 struct futex_pi_state *pi_state_cache; 1351 #endif 1352 #ifdef CONFIG_NUMA 1353 struct mempolicy *mempolicy; 1354 short il_next; 1355 #endif 1356 atomic_t fs_excl; /* holding fs exclusive resources */ 1357 struct rcu_head rcu; 1358 1359 /* 1360 * cache last used pipe for splice 1361 */ 1362 struct pipe_inode_info *splice_pipe; 1363 #ifdef CONFIG_TASK_DELAY_ACCT 1364 struct task_delay_info *delays; 1365 #endif 1366 #ifdef CONFIG_FAULT_INJECTION 1367 int make_it_fail; 1368 #endif 1369 struct prop_local_single dirties; 1370 #ifdef CONFIG_LATENCYTOP 1371 int latency_record_count; 1372 struct latency_record latency_record[LT_SAVECOUNT]; 1373 #endif 1374 /* 1375 * time slack values; these are used to round up poll() and 1376 * select() etc timeout values. These are in nanoseconds. 1377 */ 1378 unsigned long timer_slack_ns; 1379 unsigned long default_timer_slack_ns; 1380 1381 struct list_head *scm_work_list; 1382 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1383 /* Index of current stored adress in ret_stack */ 1384 int curr_ret_stack; 1385 /* Stack of return addresses for return function tracing */ 1386 struct ftrace_ret_stack *ret_stack; 1387 /* 1388 * Number of functions that haven't been traced 1389 * because of depth overrun. 1390 */ 1391 atomic_t trace_overrun; 1392 /* Pause for the tracing */ 1393 atomic_t tracing_graph_pause; 1394 #endif 1395 #ifdef CONFIG_TRACING 1396 /* state flags for use by tracers */ 1397 unsigned long trace; 1398 #endif 1399 }; 1400 1401 /* 1402 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1403 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1404 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1405 * values are inverted: lower p->prio value means higher priority. 1406 * 1407 * The MAX_USER_RT_PRIO value allows the actual maximum 1408 * RT priority to be separate from the value exported to 1409 * user-space. This allows kernel threads to set their 1410 * priority to a value higher than any user task. Note: 1411 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1412 */ 1413 1414 #define MAX_USER_RT_PRIO 100 1415 #define MAX_RT_PRIO MAX_USER_RT_PRIO 1416 1417 #define MAX_PRIO (MAX_RT_PRIO + 40) 1418 #define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1419 1420 static inline int rt_prio(int prio) 1421 { 1422 if (unlikely(prio < MAX_RT_PRIO)) 1423 return 1; 1424 return 0; 1425 } 1426 1427 static inline int rt_task(struct task_struct *p) 1428 { 1429 return rt_prio(p->prio); 1430 } 1431 1432 static inline void set_task_session(struct task_struct *tsk, pid_t session) 1433 { 1434 tsk->signal->__session = session; 1435 } 1436 1437 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp) 1438 { 1439 tsk->signal->__pgrp = pgrp; 1440 } 1441 1442 static inline struct pid *task_pid(struct task_struct *task) 1443 { 1444 return task->pids[PIDTYPE_PID].pid; 1445 } 1446 1447 static inline struct pid *task_tgid(struct task_struct *task) 1448 { 1449 return task->group_leader->pids[PIDTYPE_PID].pid; 1450 } 1451 1452 static inline struct pid *task_pgrp(struct task_struct *task) 1453 { 1454 return task->group_leader->pids[PIDTYPE_PGID].pid; 1455 } 1456 1457 static inline struct pid *task_session(struct task_struct *task) 1458 { 1459 return task->group_leader->pids[PIDTYPE_SID].pid; 1460 } 1461 1462 struct pid_namespace; 1463 1464 /* 1465 * the helpers to get the task's different pids as they are seen 1466 * from various namespaces 1467 * 1468 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1469 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 1470 * current. 1471 * task_xid_nr_ns() : id seen from the ns specified; 1472 * 1473 * set_task_vxid() : assigns a virtual id to a task; 1474 * 1475 * see also pid_nr() etc in include/linux/pid.h 1476 */ 1477 1478 static inline pid_t task_pid_nr(struct task_struct *tsk) 1479 { 1480 return tsk->pid; 1481 } 1482 1483 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1484 1485 static inline pid_t task_pid_vnr(struct task_struct *tsk) 1486 { 1487 return pid_vnr(task_pid(tsk)); 1488 } 1489 1490 1491 static inline pid_t task_tgid_nr(struct task_struct *tsk) 1492 { 1493 return tsk->tgid; 1494 } 1495 1496 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1497 1498 static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1499 { 1500 return pid_vnr(task_tgid(tsk)); 1501 } 1502 1503 1504 static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1505 { 1506 return tsk->signal->__pgrp; 1507 } 1508 1509 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1510 1511 static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1512 { 1513 return pid_vnr(task_pgrp(tsk)); 1514 } 1515 1516 1517 static inline pid_t task_session_nr(struct task_struct *tsk) 1518 { 1519 return tsk->signal->__session; 1520 } 1521 1522 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1523 1524 static inline pid_t task_session_vnr(struct task_struct *tsk) 1525 { 1526 return pid_vnr(task_session(tsk)); 1527 } 1528 1529 1530 /** 1531 * pid_alive - check that a task structure is not stale 1532 * @p: Task structure to be checked. 1533 * 1534 * Test if a process is not yet dead (at most zombie state) 1535 * If pid_alive fails, then pointers within the task structure 1536 * can be stale and must not be dereferenced. 1537 */ 1538 static inline int pid_alive(struct task_struct *p) 1539 { 1540 return p->pids[PIDTYPE_PID].pid != NULL; 1541 } 1542 1543 /** 1544 * is_global_init - check if a task structure is init 1545 * @tsk: Task structure to be checked. 1546 * 1547 * Check if a task structure is the first user space task the kernel created. 1548 */ 1549 static inline int is_global_init(struct task_struct *tsk) 1550 { 1551 return tsk->pid == 1; 1552 } 1553 1554 /* 1555 * is_container_init: 1556 * check whether in the task is init in its own pid namespace. 1557 */ 1558 extern int is_container_init(struct task_struct *tsk); 1559 1560 extern struct pid *cad_pid; 1561 1562 extern void free_task(struct task_struct *tsk); 1563 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1564 1565 extern void __put_task_struct(struct task_struct *t); 1566 1567 static inline void put_task_struct(struct task_struct *t) 1568 { 1569 if (atomic_dec_and_test(&t->usage)) 1570 __put_task_struct(t); 1571 } 1572 1573 extern cputime_t task_utime(struct task_struct *p); 1574 extern cputime_t task_stime(struct task_struct *p); 1575 extern cputime_t task_gtime(struct task_struct *p); 1576 1577 /* 1578 * Per process flags 1579 */ 1580 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 1581 /* Not implemented yet, only for 486*/ 1582 #define PF_STARTING 0x00000002 /* being created */ 1583 #define PF_EXITING 0x00000004 /* getting shut down */ 1584 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1585 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1586 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1587 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1588 #define PF_DUMPCORE 0x00000200 /* dumped core */ 1589 #define PF_SIGNALED 0x00000400 /* killed by a signal */ 1590 #define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1591 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 1592 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1593 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1594 #define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1595 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1596 #define PF_KSWAPD 0x00040000 /* I am kswapd */ 1597 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 1598 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1599 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ 1600 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1601 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1602 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1603 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1604 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ 1605 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1606 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1607 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1608 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ 1609 1610 /* 1611 * Only the _current_ task can read/write to tsk->flags, but other 1612 * tasks can access tsk->flags in readonly mode for example 1613 * with tsk_used_math (like during threaded core dumping). 1614 * There is however an exception to this rule during ptrace 1615 * or during fork: the ptracer task is allowed to write to the 1616 * child->flags of its traced child (same goes for fork, the parent 1617 * can write to the child->flags), because we're guaranteed the 1618 * child is not running and in turn not changing child->flags 1619 * at the same time the parent does it. 1620 */ 1621 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1622 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1623 #define clear_used_math() clear_stopped_child_used_math(current) 1624 #define set_used_math() set_stopped_child_used_math(current) 1625 #define conditional_stopped_child_used_math(condition, child) \ 1626 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1627 #define conditional_used_math(condition) \ 1628 conditional_stopped_child_used_math(condition, current) 1629 #define copy_to_stopped_child_used_math(child) \ 1630 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1631 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1632 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1633 #define used_math() tsk_used_math(current) 1634 1635 #ifdef CONFIG_SMP 1636 extern int set_cpus_allowed_ptr(struct task_struct *p, 1637 const struct cpumask *new_mask); 1638 #else 1639 static inline int set_cpus_allowed_ptr(struct task_struct *p, 1640 const struct cpumask *new_mask) 1641 { 1642 if (!cpumask_test_cpu(0, new_mask)) 1643 return -EINVAL; 1644 return 0; 1645 } 1646 #endif 1647 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1648 { 1649 return set_cpus_allowed_ptr(p, &new_mask); 1650 } 1651 1652 extern unsigned long long sched_clock(void); 1653 1654 extern void sched_clock_init(void); 1655 extern u64 sched_clock_cpu(int cpu); 1656 1657 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1658 static inline void sched_clock_tick(void) 1659 { 1660 } 1661 1662 static inline void sched_clock_idle_sleep_event(void) 1663 { 1664 } 1665 1666 static inline void sched_clock_idle_wakeup_event(u64 delta_ns) 1667 { 1668 } 1669 #else 1670 extern void sched_clock_tick(void); 1671 extern void sched_clock_idle_sleep_event(void); 1672 extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1673 #endif 1674 1675 /* 1676 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1677 * clock constructed from sched_clock(): 1678 */ 1679 extern unsigned long long cpu_clock(int cpu); 1680 1681 extern unsigned long long 1682 task_sched_runtime(struct task_struct *task); 1683 extern unsigned long long thread_group_sched_runtime(struct task_struct *task); 1684 1685 /* sched_exec is called by processes performing an exec */ 1686 #ifdef CONFIG_SMP 1687 extern void sched_exec(void); 1688 #else 1689 #define sched_exec() {} 1690 #endif 1691 1692 extern void sched_clock_idle_sleep_event(void); 1693 extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1694 1695 #ifdef CONFIG_HOTPLUG_CPU 1696 extern void idle_task_exit(void); 1697 #else 1698 static inline void idle_task_exit(void) {} 1699 #endif 1700 1701 extern void sched_idle_next(void); 1702 1703 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) 1704 extern void wake_up_idle_cpu(int cpu); 1705 #else 1706 static inline void wake_up_idle_cpu(int cpu) { } 1707 #endif 1708 1709 extern unsigned int sysctl_sched_latency; 1710 extern unsigned int sysctl_sched_min_granularity; 1711 extern unsigned int sysctl_sched_wakeup_granularity; 1712 extern unsigned int sysctl_sched_shares_ratelimit; 1713 extern unsigned int sysctl_sched_shares_thresh; 1714 #ifdef CONFIG_SCHED_DEBUG 1715 extern unsigned int sysctl_sched_child_runs_first; 1716 extern unsigned int sysctl_sched_features; 1717 extern unsigned int sysctl_sched_migration_cost; 1718 extern unsigned int sysctl_sched_nr_migrate; 1719 1720 int sched_nr_latency_handler(struct ctl_table *table, int write, 1721 struct file *file, void __user *buffer, size_t *length, 1722 loff_t *ppos); 1723 #endif 1724 extern unsigned int sysctl_sched_rt_period; 1725 extern int sysctl_sched_rt_runtime; 1726 1727 int sched_rt_handler(struct ctl_table *table, int write, 1728 struct file *filp, void __user *buffer, size_t *lenp, 1729 loff_t *ppos); 1730 1731 extern unsigned int sysctl_sched_compat_yield; 1732 1733 #ifdef CONFIG_RT_MUTEXES 1734 extern int rt_mutex_getprio(struct task_struct *p); 1735 extern void rt_mutex_setprio(struct task_struct *p, int prio); 1736 extern void rt_mutex_adjust_pi(struct task_struct *p); 1737 #else 1738 static inline int rt_mutex_getprio(struct task_struct *p) 1739 { 1740 return p->normal_prio; 1741 } 1742 # define rt_mutex_adjust_pi(p) do { } while (0) 1743 #endif 1744 1745 extern void set_user_nice(struct task_struct *p, long nice); 1746 extern int task_prio(const struct task_struct *p); 1747 extern int task_nice(const struct task_struct *p); 1748 extern int can_nice(const struct task_struct *p, const int nice); 1749 extern int task_curr(const struct task_struct *p); 1750 extern int idle_cpu(int cpu); 1751 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1752 extern int sched_setscheduler_nocheck(struct task_struct *, int, 1753 struct sched_param *); 1754 extern struct task_struct *idle_task(int cpu); 1755 extern struct task_struct *curr_task(int cpu); 1756 extern void set_curr_task(int cpu, struct task_struct *p); 1757 1758 void yield(void); 1759 1760 /* 1761 * The default (Linux) execution domain. 1762 */ 1763 extern struct exec_domain default_exec_domain; 1764 1765 union thread_union { 1766 struct thread_info thread_info; 1767 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1768 }; 1769 1770 #ifndef __HAVE_ARCH_KSTACK_END 1771 static inline int kstack_end(void *addr) 1772 { 1773 /* Reliable end of stack detection: 1774 * Some APM bios versions misalign the stack 1775 */ 1776 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1777 } 1778 #endif 1779 1780 extern union thread_union init_thread_union; 1781 extern struct task_struct init_task; 1782 1783 extern struct mm_struct init_mm; 1784 1785 extern struct pid_namespace init_pid_ns; 1786 1787 /* 1788 * find a task by one of its numerical ids 1789 * 1790 * find_task_by_pid_type_ns(): 1791 * it is the most generic call - it finds a task by all id, 1792 * type and namespace specified 1793 * find_task_by_pid_ns(): 1794 * finds a task by its pid in the specified namespace 1795 * find_task_by_vpid(): 1796 * finds a task by its virtual pid 1797 * 1798 * see also find_vpid() etc in include/linux/pid.h 1799 */ 1800 1801 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid, 1802 struct pid_namespace *ns); 1803 1804 extern struct task_struct *find_task_by_vpid(pid_t nr); 1805 extern struct task_struct *find_task_by_pid_ns(pid_t nr, 1806 struct pid_namespace *ns); 1807 1808 extern void __set_special_pids(struct pid *pid); 1809 1810 /* per-UID process charging. */ 1811 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 1812 static inline struct user_struct *get_uid(struct user_struct *u) 1813 { 1814 atomic_inc(&u->__count); 1815 return u; 1816 } 1817 extern void free_uid(struct user_struct *); 1818 extern void release_uids(struct user_namespace *ns); 1819 1820 #include <asm/current.h> 1821 1822 extern void do_timer(unsigned long ticks); 1823 1824 extern int wake_up_state(struct task_struct *tsk, unsigned int state); 1825 extern int wake_up_process(struct task_struct *tsk); 1826 extern void wake_up_new_task(struct task_struct *tsk, 1827 unsigned long clone_flags); 1828 #ifdef CONFIG_SMP 1829 extern void kick_process(struct task_struct *tsk); 1830 #else 1831 static inline void kick_process(struct task_struct *tsk) { } 1832 #endif 1833 extern void sched_fork(struct task_struct *p, int clone_flags); 1834 extern void sched_dead(struct task_struct *p); 1835 1836 extern void proc_caches_init(void); 1837 extern void flush_signals(struct task_struct *); 1838 extern void ignore_signals(struct task_struct *); 1839 extern void flush_signal_handlers(struct task_struct *, int force_default); 1840 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 1841 1842 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 1843 { 1844 unsigned long flags; 1845 int ret; 1846 1847 spin_lock_irqsave(&tsk->sighand->siglock, flags); 1848 ret = dequeue_signal(tsk, mask, info); 1849 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 1850 1851 return ret; 1852 } 1853 1854 extern void block_all_signals(int (*notifier)(void *priv), void *priv, 1855 sigset_t *mask); 1856 extern void unblock_all_signals(void); 1857 extern void release_task(struct task_struct * p); 1858 extern int send_sig_info(int, struct siginfo *, struct task_struct *); 1859 extern int force_sigsegv(int, struct task_struct *); 1860 extern int force_sig_info(int, struct siginfo *, struct task_struct *); 1861 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1862 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 1863 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 1864 extern int kill_pgrp(struct pid *pid, int sig, int priv); 1865 extern int kill_pid(struct pid *pid, int sig, int priv); 1866 extern int kill_proc_info(int, struct siginfo *, pid_t); 1867 extern int do_notify_parent(struct task_struct *, int); 1868 extern void force_sig(int, struct task_struct *); 1869 extern void force_sig_specific(int, struct task_struct *); 1870 extern int send_sig(int, struct task_struct *, int); 1871 extern void zap_other_threads(struct task_struct *p); 1872 extern struct sigqueue *sigqueue_alloc(void); 1873 extern void sigqueue_free(struct sigqueue *); 1874 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); 1875 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 1876 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 1877 1878 static inline int kill_cad_pid(int sig, int priv) 1879 { 1880 return kill_pid(cad_pid, sig, priv); 1881 } 1882 1883 /* These can be the second arg to send_sig_info/send_group_sig_info. */ 1884 #define SEND_SIG_NOINFO ((struct siginfo *) 0) 1885 #define SEND_SIG_PRIV ((struct siginfo *) 1) 1886 #define SEND_SIG_FORCED ((struct siginfo *) 2) 1887 1888 static inline int is_si_special(const struct siginfo *info) 1889 { 1890 return info <= SEND_SIG_FORCED; 1891 } 1892 1893 /* True if we are on the alternate signal stack. */ 1894 1895 static inline int on_sig_stack(unsigned long sp) 1896 { 1897 return (sp - current->sas_ss_sp < current->sas_ss_size); 1898 } 1899 1900 static inline int sas_ss_flags(unsigned long sp) 1901 { 1902 return (current->sas_ss_size == 0 ? SS_DISABLE 1903 : on_sig_stack(sp) ? SS_ONSTACK : 0); 1904 } 1905 1906 /* 1907 * Routines for handling mm_structs 1908 */ 1909 extern struct mm_struct * mm_alloc(void); 1910 1911 /* mmdrop drops the mm and the page tables */ 1912 extern void __mmdrop(struct mm_struct *); 1913 static inline void mmdrop(struct mm_struct * mm) 1914 { 1915 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 1916 __mmdrop(mm); 1917 } 1918 1919 /* mmput gets rid of the mappings and all user-space */ 1920 extern void mmput(struct mm_struct *); 1921 /* Grab a reference to a task's mm, if it is not already going away */ 1922 extern struct mm_struct *get_task_mm(struct task_struct *task); 1923 /* Remove the current tasks stale references to the old mm_struct */ 1924 extern void mm_release(struct task_struct *, struct mm_struct *); 1925 /* Allocate a new mm structure and copy contents from tsk->mm */ 1926 extern struct mm_struct *dup_mm(struct task_struct *tsk); 1927 1928 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 1929 extern void flush_thread(void); 1930 extern void exit_thread(void); 1931 1932 extern void exit_files(struct task_struct *); 1933 extern void __cleanup_signal(struct signal_struct *); 1934 extern void __cleanup_sighand(struct sighand_struct *); 1935 1936 extern void exit_itimers(struct signal_struct *); 1937 extern void flush_itimer_signals(void); 1938 1939 extern NORET_TYPE void do_group_exit(int); 1940 1941 extern void daemonize(const char *, ...); 1942 extern int allow_signal(int); 1943 extern int disallow_signal(int); 1944 1945 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 1946 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 1947 struct task_struct *fork_idle(int); 1948 1949 extern void set_task_comm(struct task_struct *tsk, char *from); 1950 extern char *get_task_comm(char *to, struct task_struct *tsk); 1951 1952 #ifdef CONFIG_SMP 1953 extern unsigned long wait_task_inactive(struct task_struct *, long match_state); 1954 #else 1955 static inline unsigned long wait_task_inactive(struct task_struct *p, 1956 long match_state) 1957 { 1958 return 1; 1959 } 1960 #endif 1961 1962 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) 1963 1964 #define for_each_process(p) \ 1965 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 1966 1967 extern bool is_single_threaded(struct task_struct *); 1968 1969 /* 1970 * Careful: do_each_thread/while_each_thread is a double loop so 1971 * 'break' will not work as expected - use goto instead. 1972 */ 1973 #define do_each_thread(g, t) \ 1974 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 1975 1976 #define while_each_thread(g, t) \ 1977 while ((t = next_thread(t)) != g) 1978 1979 /* de_thread depends on thread_group_leader not being a pid based check */ 1980 #define thread_group_leader(p) (p == p->group_leader) 1981 1982 /* Do to the insanities of de_thread it is possible for a process 1983 * to have the pid of the thread group leader without actually being 1984 * the thread group leader. For iteration through the pids in proc 1985 * all we care about is that we have a task with the appropriate 1986 * pid, we don't actually care if we have the right task. 1987 */ 1988 static inline int has_group_leader_pid(struct task_struct *p) 1989 { 1990 return p->pid == p->tgid; 1991 } 1992 1993 static inline 1994 int same_thread_group(struct task_struct *p1, struct task_struct *p2) 1995 { 1996 return p1->tgid == p2->tgid; 1997 } 1998 1999 static inline struct task_struct *next_thread(const struct task_struct *p) 2000 { 2001 return list_entry(rcu_dereference(p->thread_group.next), 2002 struct task_struct, thread_group); 2003 } 2004 2005 static inline int thread_group_empty(struct task_struct *p) 2006 { 2007 return list_empty(&p->thread_group); 2008 } 2009 2010 #define delay_group_leader(p) \ 2011 (thread_group_leader(p) && !thread_group_empty(p)) 2012 2013 /* 2014 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 2015 * subscriptions and synchronises with wait4(). Also used in procfs. Also 2016 * pins the final release of task.io_context. Also protects ->cpuset and 2017 * ->cgroup.subsys[]. 2018 * 2019 * Nests both inside and outside of read_lock(&tasklist_lock). 2020 * It must not be nested with write_lock_irq(&tasklist_lock), 2021 * neither inside nor outside. 2022 */ 2023 static inline void task_lock(struct task_struct *p) 2024 { 2025 spin_lock(&p->alloc_lock); 2026 } 2027 2028 static inline void task_unlock(struct task_struct *p) 2029 { 2030 spin_unlock(&p->alloc_lock); 2031 } 2032 2033 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 2034 unsigned long *flags); 2035 2036 static inline void unlock_task_sighand(struct task_struct *tsk, 2037 unsigned long *flags) 2038 { 2039 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 2040 } 2041 2042 #ifndef __HAVE_THREAD_FUNCTIONS 2043 2044 #define task_thread_info(task) ((struct thread_info *)(task)->stack) 2045 #define task_stack_page(task) ((task)->stack) 2046 2047 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 2048 { 2049 *task_thread_info(p) = *task_thread_info(org); 2050 task_thread_info(p)->task = p; 2051 } 2052 2053 static inline unsigned long *end_of_stack(struct task_struct *p) 2054 { 2055 return (unsigned long *)(task_thread_info(p) + 1); 2056 } 2057 2058 #endif 2059 2060 static inline int object_is_on_stack(void *obj) 2061 { 2062 void *stack = task_stack_page(current); 2063 2064 return (obj >= stack) && (obj < (stack + THREAD_SIZE)); 2065 } 2066 2067 extern void thread_info_cache_init(void); 2068 2069 /* set thread flags in other task's structures 2070 * - see asm/thread_info.h for TIF_xxxx flags available 2071 */ 2072 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 2073 { 2074 set_ti_thread_flag(task_thread_info(tsk), flag); 2075 } 2076 2077 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2078 { 2079 clear_ti_thread_flag(task_thread_info(tsk), flag); 2080 } 2081 2082 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 2083 { 2084 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 2085 } 2086 2087 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2088 { 2089 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 2090 } 2091 2092 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 2093 { 2094 return test_ti_thread_flag(task_thread_info(tsk), flag); 2095 } 2096 2097 static inline void set_tsk_need_resched(struct task_struct *tsk) 2098 { 2099 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2100 } 2101 2102 static inline void clear_tsk_need_resched(struct task_struct *tsk) 2103 { 2104 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2105 } 2106 2107 static inline int test_tsk_need_resched(struct task_struct *tsk) 2108 { 2109 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); 2110 } 2111 2112 static inline int signal_pending(struct task_struct *p) 2113 { 2114 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 2115 } 2116 2117 extern int __fatal_signal_pending(struct task_struct *p); 2118 2119 static inline int fatal_signal_pending(struct task_struct *p) 2120 { 2121 return signal_pending(p) && __fatal_signal_pending(p); 2122 } 2123 2124 static inline int signal_pending_state(long state, struct task_struct *p) 2125 { 2126 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) 2127 return 0; 2128 if (!signal_pending(p)) 2129 return 0; 2130 2131 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); 2132 } 2133 2134 static inline int need_resched(void) 2135 { 2136 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 2137 } 2138 2139 /* 2140 * cond_resched() and cond_resched_lock(): latency reduction via 2141 * explicit rescheduling in places that are safe. The return 2142 * value indicates whether a reschedule was done in fact. 2143 * cond_resched_lock() will drop the spinlock before scheduling, 2144 * cond_resched_softirq() will enable bhs before scheduling. 2145 */ 2146 extern int _cond_resched(void); 2147 #ifdef CONFIG_PREEMPT_BKL 2148 static inline int cond_resched(void) 2149 { 2150 return 0; 2151 } 2152 #else 2153 static inline int cond_resched(void) 2154 { 2155 return _cond_resched(); 2156 } 2157 #endif 2158 extern int cond_resched_lock(spinlock_t * lock); 2159 extern int cond_resched_softirq(void); 2160 static inline int cond_resched_bkl(void) 2161 { 2162 return _cond_resched(); 2163 } 2164 2165 /* 2166 * Does a critical section need to be broken due to another 2167 * task waiting?: (technically does not depend on CONFIG_PREEMPT, 2168 * but a general need for low latency) 2169 */ 2170 static inline int spin_needbreak(spinlock_t *lock) 2171 { 2172 #ifdef CONFIG_PREEMPT 2173 return spin_is_contended(lock); 2174 #else 2175 return 0; 2176 #endif 2177 } 2178 2179 /* 2180 * Thread group CPU time accounting. 2181 */ 2182 2183 extern int thread_group_cputime_alloc(struct task_struct *); 2184 extern void thread_group_cputime(struct task_struct *, struct task_cputime *); 2185 2186 static inline void thread_group_cputime_init(struct signal_struct *sig) 2187 { 2188 sig->cputime.totals = NULL; 2189 } 2190 2191 static inline int thread_group_cputime_clone_thread(struct task_struct *curr) 2192 { 2193 if (curr->signal->cputime.totals) 2194 return 0; 2195 return thread_group_cputime_alloc(curr); 2196 } 2197 2198 static inline void thread_group_cputime_free(struct signal_struct *sig) 2199 { 2200 free_percpu(sig->cputime.totals); 2201 } 2202 2203 /* 2204 * Reevaluate whether the task has signals pending delivery. 2205 * Wake the task if so. 2206 * This is required every time the blocked sigset_t changes. 2207 * callers must hold sighand->siglock. 2208 */ 2209 extern void recalc_sigpending_and_wake(struct task_struct *t); 2210 extern void recalc_sigpending(void); 2211 2212 extern void signal_wake_up(struct task_struct *t, int resume_stopped); 2213 2214 /* 2215 * Wrappers for p->thread_info->cpu access. No-op on UP. 2216 */ 2217 #ifdef CONFIG_SMP 2218 2219 static inline unsigned int task_cpu(const struct task_struct *p) 2220 { 2221 return task_thread_info(p)->cpu; 2222 } 2223 2224 extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 2225 2226 #else 2227 2228 static inline unsigned int task_cpu(const struct task_struct *p) 2229 { 2230 return 0; 2231 } 2232 2233 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 2234 { 2235 } 2236 2237 #endif /* CONFIG_SMP */ 2238 2239 extern void arch_pick_mmap_layout(struct mm_struct *mm); 2240 2241 #ifdef CONFIG_TRACING 2242 extern void 2243 __trace_special(void *__tr, void *__data, 2244 unsigned long arg1, unsigned long arg2, unsigned long arg3); 2245 #else 2246 static inline void 2247 __trace_special(void *__tr, void *__data, 2248 unsigned long arg1, unsigned long arg2, unsigned long arg3) 2249 { 2250 } 2251 #endif 2252 2253 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); 2254 extern long sched_getaffinity(pid_t pid, struct cpumask *mask); 2255 2256 extern void normalize_rt_tasks(void); 2257 2258 #ifdef CONFIG_GROUP_SCHED 2259 2260 extern struct task_group init_task_group; 2261 #ifdef CONFIG_USER_SCHED 2262 extern struct task_group root_task_group; 2263 extern void set_tg_uid(struct user_struct *user); 2264 #endif 2265 2266 extern struct task_group *sched_create_group(struct task_group *parent); 2267 extern void sched_destroy_group(struct task_group *tg); 2268 extern void sched_move_task(struct task_struct *tsk); 2269 #ifdef CONFIG_FAIR_GROUP_SCHED 2270 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 2271 extern unsigned long sched_group_shares(struct task_group *tg); 2272 #endif 2273 #ifdef CONFIG_RT_GROUP_SCHED 2274 extern int sched_group_set_rt_runtime(struct task_group *tg, 2275 long rt_runtime_us); 2276 extern long sched_group_rt_runtime(struct task_group *tg); 2277 extern int sched_group_set_rt_period(struct task_group *tg, 2278 long rt_period_us); 2279 extern long sched_group_rt_period(struct task_group *tg); 2280 #endif 2281 #endif 2282 2283 #ifdef CONFIG_TASK_XACCT 2284 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2285 { 2286 tsk->ioac.rchar += amt; 2287 } 2288 2289 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2290 { 2291 tsk->ioac.wchar += amt; 2292 } 2293 2294 static inline void inc_syscr(struct task_struct *tsk) 2295 { 2296 tsk->ioac.syscr++; 2297 } 2298 2299 static inline void inc_syscw(struct task_struct *tsk) 2300 { 2301 tsk->ioac.syscw++; 2302 } 2303 #else 2304 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2305 { 2306 } 2307 2308 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2309 { 2310 } 2311 2312 static inline void inc_syscr(struct task_struct *tsk) 2313 { 2314 } 2315 2316 static inline void inc_syscw(struct task_struct *tsk) 2317 { 2318 } 2319 #endif 2320 2321 #ifndef TASK_SIZE_OF 2322 #define TASK_SIZE_OF(tsk) TASK_SIZE 2323 #endif 2324 2325 #ifdef CONFIG_MM_OWNER 2326 extern void mm_update_next_owner(struct mm_struct *mm); 2327 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); 2328 #else 2329 static inline void mm_update_next_owner(struct mm_struct *mm) 2330 { 2331 } 2332 2333 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) 2334 { 2335 } 2336 #endif /* CONFIG_MM_OWNER */ 2337 2338 #define TASK_STATE_TO_CHAR_STR "RSDTtZX" 2339 2340 #endif /* __KERNEL__ */ 2341 2342 #endif 2343