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