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 31 /* 32 * Scheduling policies 33 */ 34 #define SCHED_NORMAL 0 35 #define SCHED_FIFO 1 36 #define SCHED_RR 2 37 #define SCHED_BATCH 3 38 /* SCHED_ISO: reserved but not implemented yet */ 39 #define SCHED_IDLE 5 40 41 #ifdef __KERNEL__ 42 43 struct sched_param { 44 int sched_priority; 45 }; 46 47 #include <asm/param.h> /* for HZ */ 48 49 #include <linux/capability.h> 50 #include <linux/threads.h> 51 #include <linux/kernel.h> 52 #include <linux/types.h> 53 #include <linux/timex.h> 54 #include <linux/jiffies.h> 55 #include <linux/rbtree.h> 56 #include <linux/thread_info.h> 57 #include <linux/cpumask.h> 58 #include <linux/errno.h> 59 #include <linux/nodemask.h> 60 #include <linux/mm_types.h> 61 62 #include <asm/system.h> 63 #include <asm/semaphore.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/securebits.h> 72 #include <linux/fs_struct.h> 73 #include <linux/compiler.h> 74 #include <linux/completion.h> 75 #include <linux/pid.h> 76 #include <linux/percpu.h> 77 #include <linux/topology.h> 78 #include <linux/proportions.h> 79 #include <linux/seccomp.h> 80 #include <linux/rcupdate.h> 81 #include <linux/futex.h> 82 #include <linux/rtmutex.h> 83 84 #include <linux/time.h> 85 #include <linux/param.h> 86 #include <linux/resource.h> 87 #include <linux/timer.h> 88 #include <linux/hrtimer.h> 89 #include <linux/task_io_accounting.h> 90 #include <linux/kobject.h> 91 92 #include <asm/processor.h> 93 94 struct exec_domain; 95 struct futex_pi_state; 96 struct bio; 97 98 /* 99 * List of flags we want to share for kernel threads, 100 * if only because they are not used by them anyway. 101 */ 102 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 103 104 /* 105 * These are the constant used to fake the fixed-point load-average 106 * counting. Some notes: 107 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 108 * a load-average precision of 10 bits integer + 11 bits fractional 109 * - if you want to count load-averages more often, you need more 110 * precision, or rounding will get you. With 2-second counting freq, 111 * the EXP_n values would be 1981, 2034 and 2043 if still using only 112 * 11 bit fractions. 113 */ 114 extern unsigned long avenrun[]; /* Load averages */ 115 116 #define FSHIFT 11 /* nr of bits of precision */ 117 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 118 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ 119 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 120 #define EXP_5 2014 /* 1/exp(5sec/5min) */ 121 #define EXP_15 2037 /* 1/exp(5sec/15min) */ 122 123 #define CALC_LOAD(load,exp,n) \ 124 load *= exp; \ 125 load += n*(FIXED_1-exp); \ 126 load >>= FSHIFT; 127 128 extern unsigned long total_forks; 129 extern int nr_threads; 130 DECLARE_PER_CPU(unsigned long, process_counts); 131 extern int nr_processes(void); 132 extern unsigned long nr_running(void); 133 extern unsigned long nr_uninterruptible(void); 134 extern unsigned long nr_active(void); 135 extern unsigned long nr_iowait(void); 136 extern unsigned long weighted_cpuload(const int cpu); 137 138 struct seq_file; 139 struct cfs_rq; 140 struct task_group; 141 #ifdef CONFIG_SCHED_DEBUG 142 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 143 extern void proc_sched_set_task(struct task_struct *p); 144 extern void 145 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 146 #else 147 static inline void 148 proc_sched_show_task(struct task_struct *p, struct seq_file *m) 149 { 150 } 151 static inline void proc_sched_set_task(struct task_struct *p) 152 { 153 } 154 static inline void 155 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 156 { 157 } 158 #endif 159 160 /* 161 * Task state bitmask. NOTE! These bits are also 162 * encoded in fs/proc/array.c: get_task_state(). 163 * 164 * We have two separate sets of flags: task->state 165 * is about runnability, while task->exit_state are 166 * about the task exiting. Confusing, but this way 167 * modifying one set can't modify the other one by 168 * mistake. 169 */ 170 #define TASK_RUNNING 0 171 #define TASK_INTERRUPTIBLE 1 172 #define TASK_UNINTERRUPTIBLE 2 173 #define TASK_STOPPED 4 174 #define TASK_TRACED 8 175 /* in tsk->exit_state */ 176 #define EXIT_ZOMBIE 16 177 #define EXIT_DEAD 32 178 /* in tsk->state again */ 179 #define TASK_DEAD 64 180 181 #define __set_task_state(tsk, state_value) \ 182 do { (tsk)->state = (state_value); } while (0) 183 #define set_task_state(tsk, state_value) \ 184 set_mb((tsk)->state, (state_value)) 185 186 /* 187 * set_current_state() includes a barrier so that the write of current->state 188 * is correctly serialised wrt the caller's subsequent test of whether to 189 * actually sleep: 190 * 191 * set_current_state(TASK_UNINTERRUPTIBLE); 192 * if (do_i_need_to_sleep()) 193 * schedule(); 194 * 195 * If the caller does not need such serialisation then use __set_current_state() 196 */ 197 #define __set_current_state(state_value) \ 198 do { current->state = (state_value); } while (0) 199 #define set_current_state(state_value) \ 200 set_mb(current->state, (state_value)) 201 202 /* Task command name length */ 203 #define TASK_COMM_LEN 16 204 205 #include <linux/spinlock.h> 206 207 /* 208 * This serializes "schedule()" and also protects 209 * the run-queue from deletions/modifications (but 210 * _adding_ to the beginning of the run-queue has 211 * a separate lock). 212 */ 213 extern rwlock_t tasklist_lock; 214 extern spinlock_t mmlist_lock; 215 216 struct task_struct; 217 218 extern void sched_init(void); 219 extern void sched_init_smp(void); 220 extern void init_idle(struct task_struct *idle, int cpu); 221 extern void init_idle_bootup_task(struct task_struct *idle); 222 223 extern cpumask_t nohz_cpu_mask; 224 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 225 extern int select_nohz_load_balancer(int cpu); 226 #else 227 static inline int select_nohz_load_balancer(int cpu) 228 { 229 return 0; 230 } 231 #endif 232 233 /* 234 * Only dump TASK_* tasks. (0 for all tasks) 235 */ 236 extern void show_state_filter(unsigned long state_filter); 237 238 static inline void show_state(void) 239 { 240 show_state_filter(0); 241 } 242 243 extern void show_regs(struct pt_regs *); 244 245 /* 246 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 247 * task), SP is the stack pointer of the first frame that should be shown in the back 248 * trace (or NULL if the entire call-chain of the task should be shown). 249 */ 250 extern void show_stack(struct task_struct *task, unsigned long *sp); 251 252 void io_schedule(void); 253 long io_schedule_timeout(long timeout); 254 255 extern void cpu_init (void); 256 extern void trap_init(void); 257 extern void account_process_tick(struct task_struct *task, int user); 258 extern void update_process_times(int user); 259 extern void scheduler_tick(void); 260 261 #ifdef CONFIG_DETECT_SOFTLOCKUP 262 extern void softlockup_tick(void); 263 extern void spawn_softlockup_task(void); 264 extern void touch_softlockup_watchdog(void); 265 extern void touch_all_softlockup_watchdogs(void); 266 extern int softlockup_thresh; 267 #else 268 static inline void softlockup_tick(void) 269 { 270 } 271 static inline void spawn_softlockup_task(void) 272 { 273 } 274 static inline void touch_softlockup_watchdog(void) 275 { 276 } 277 static inline void touch_all_softlockup_watchdogs(void) 278 { 279 } 280 #endif 281 282 283 /* Attach to any functions which should be ignored in wchan output. */ 284 #define __sched __attribute__((__section__(".sched.text"))) 285 286 /* Linker adds these: start and end of __sched functions */ 287 extern char __sched_text_start[], __sched_text_end[]; 288 289 /* Is this address in the __sched functions? */ 290 extern int in_sched_functions(unsigned long addr); 291 292 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 293 extern signed long FASTCALL(schedule_timeout(signed long timeout)); 294 extern signed long schedule_timeout_interruptible(signed long timeout); 295 extern signed long schedule_timeout_uninterruptible(signed long timeout); 296 asmlinkage void schedule(void); 297 298 struct nsproxy; 299 struct user_namespace; 300 301 /* Maximum number of active map areas.. This is a random (large) number */ 302 #define DEFAULT_MAX_MAP_COUNT 65536 303 304 extern int sysctl_max_map_count; 305 306 #include <linux/aio.h> 307 308 extern unsigned long 309 arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 310 unsigned long, unsigned long); 311 extern unsigned long 312 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 313 unsigned long len, unsigned long pgoff, 314 unsigned long flags); 315 extern void arch_unmap_area(struct mm_struct *, unsigned long); 316 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 317 318 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS 319 /* 320 * The mm counters are not protected by its page_table_lock, 321 * so must be incremented atomically. 322 */ 323 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) 324 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) 325 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) 326 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) 327 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) 328 329 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 330 /* 331 * The mm counters are protected by its page_table_lock, 332 * so can be incremented directly. 333 */ 334 #define set_mm_counter(mm, member, value) (mm)->_##member = (value) 335 #define get_mm_counter(mm, member) ((mm)->_##member) 336 #define add_mm_counter(mm, member, value) (mm)->_##member += (value) 337 #define inc_mm_counter(mm, member) (mm)->_##member++ 338 #define dec_mm_counter(mm, member) (mm)->_##member-- 339 340 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 341 342 #define get_mm_rss(mm) \ 343 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) 344 #define update_hiwater_rss(mm) do { \ 345 unsigned long _rss = get_mm_rss(mm); \ 346 if ((mm)->hiwater_rss < _rss) \ 347 (mm)->hiwater_rss = _rss; \ 348 } while (0) 349 #define update_hiwater_vm(mm) do { \ 350 if ((mm)->hiwater_vm < (mm)->total_vm) \ 351 (mm)->hiwater_vm = (mm)->total_vm; \ 352 } while (0) 353 354 extern void set_dumpable(struct mm_struct *mm, int value); 355 extern int get_dumpable(struct mm_struct *mm); 356 357 /* mm flags */ 358 /* dumpable bits */ 359 #define MMF_DUMPABLE 0 /* core dump is permitted */ 360 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 361 #define MMF_DUMPABLE_BITS 2 362 363 /* coredump filter bits */ 364 #define MMF_DUMP_ANON_PRIVATE 2 365 #define MMF_DUMP_ANON_SHARED 3 366 #define MMF_DUMP_MAPPED_PRIVATE 4 367 #define MMF_DUMP_MAPPED_SHARED 5 368 #define MMF_DUMP_ELF_HEADERS 6 369 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 370 #define MMF_DUMP_FILTER_BITS 5 371 #define MMF_DUMP_FILTER_MASK \ 372 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 373 #define MMF_DUMP_FILTER_DEFAULT \ 374 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED)) 375 376 struct sighand_struct { 377 atomic_t count; 378 struct k_sigaction action[_NSIG]; 379 spinlock_t siglock; 380 wait_queue_head_t signalfd_wqh; 381 }; 382 383 struct pacct_struct { 384 int ac_flag; 385 long ac_exitcode; 386 unsigned long ac_mem; 387 cputime_t ac_utime, ac_stime; 388 unsigned long ac_minflt, ac_majflt; 389 }; 390 391 /* 392 * NOTE! "signal_struct" does not have it's own 393 * locking, because a shared signal_struct always 394 * implies a shared sighand_struct, so locking 395 * sighand_struct is always a proper superset of 396 * the locking of signal_struct. 397 */ 398 struct signal_struct { 399 atomic_t count; 400 atomic_t live; 401 402 wait_queue_head_t wait_chldexit; /* for wait4() */ 403 404 /* current thread group signal load-balancing target: */ 405 struct task_struct *curr_target; 406 407 /* shared signal handling: */ 408 struct sigpending shared_pending; 409 410 /* thread group exit support */ 411 int group_exit_code; 412 /* overloaded: 413 * - notify group_exit_task when ->count is equal to notify_count 414 * - everyone except group_exit_task is stopped during signal delivery 415 * of fatal signals, group_exit_task processes the signal. 416 */ 417 struct task_struct *group_exit_task; 418 int notify_count; 419 420 /* thread group stop support, overloads group_exit_code too */ 421 int group_stop_count; 422 unsigned int flags; /* see SIGNAL_* flags below */ 423 424 /* POSIX.1b Interval Timers */ 425 struct list_head posix_timers; 426 427 /* ITIMER_REAL timer for the process */ 428 struct hrtimer real_timer; 429 struct task_struct *tsk; 430 ktime_t it_real_incr; 431 432 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 433 cputime_t it_prof_expires, it_virt_expires; 434 cputime_t it_prof_incr, it_virt_incr; 435 436 /* job control IDs */ 437 438 /* 439 * pgrp and session fields are deprecated. 440 * use the task_session_Xnr and task_pgrp_Xnr routines below 441 */ 442 443 union { 444 pid_t pgrp __deprecated; 445 pid_t __pgrp; 446 }; 447 448 struct pid *tty_old_pgrp; 449 450 union { 451 pid_t session __deprecated; 452 pid_t __session; 453 }; 454 455 /* boolean value for session group leader */ 456 int leader; 457 458 struct tty_struct *tty; /* NULL if no tty */ 459 460 /* 461 * Cumulative resource counters for dead threads in the group, 462 * and for reaped dead child processes forked by this group. 463 * Live threads maintain their own counters and add to these 464 * in __exit_signal, except for the group leader. 465 */ 466 cputime_t utime, stime, cutime, cstime; 467 cputime_t gtime; 468 cputime_t cgtime; 469 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 470 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 471 unsigned long inblock, oublock, cinblock, coublock; 472 473 /* 474 * Cumulative ns of scheduled CPU time for dead threads in the 475 * group, not including a zombie group leader. (This only differs 476 * from jiffies_to_ns(utime + stime) if sched_clock uses something 477 * other than jiffies.) 478 */ 479 unsigned long long sum_sched_runtime; 480 481 /* 482 * We don't bother to synchronize most readers of this at all, 483 * because there is no reader checking a limit that actually needs 484 * to get both rlim_cur and rlim_max atomically, and either one 485 * alone is a single word that can safely be read normally. 486 * getrlimit/setrlimit use task_lock(current->group_leader) to 487 * protect this instead of the siglock, because they really 488 * have no need to disable irqs. 489 */ 490 struct rlimit rlim[RLIM_NLIMITS]; 491 492 struct list_head cpu_timers[3]; 493 494 /* keep the process-shared keyrings here so that they do the right 495 * thing in threads created with CLONE_THREAD */ 496 #ifdef CONFIG_KEYS 497 struct key *session_keyring; /* keyring inherited over fork */ 498 struct key *process_keyring; /* keyring private to this process */ 499 #endif 500 #ifdef CONFIG_BSD_PROCESS_ACCT 501 struct pacct_struct pacct; /* per-process accounting information */ 502 #endif 503 #ifdef CONFIG_TASKSTATS 504 struct taskstats *stats; 505 #endif 506 #ifdef CONFIG_AUDIT 507 unsigned audit_tty; 508 struct tty_audit_buf *tty_audit_buf; 509 #endif 510 }; 511 512 /* Context switch must be unlocked if interrupts are to be enabled */ 513 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 514 # define __ARCH_WANT_UNLOCKED_CTXSW 515 #endif 516 517 /* 518 * Bits in flags field of signal_struct. 519 */ 520 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 521 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 522 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 523 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 524 525 /* 526 * Some day this will be a full-fledged user tracking system.. 527 */ 528 struct user_struct { 529 atomic_t __count; /* reference count */ 530 atomic_t processes; /* How many processes does this user have? */ 531 atomic_t files; /* How many open files does this user have? */ 532 atomic_t sigpending; /* How many pending signals does this user have? */ 533 #ifdef CONFIG_INOTIFY_USER 534 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 535 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 536 #endif 537 #ifdef CONFIG_POSIX_MQUEUE 538 /* protected by mq_lock */ 539 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 540 #endif 541 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 542 543 #ifdef CONFIG_KEYS 544 struct key *uid_keyring; /* UID specific keyring */ 545 struct key *session_keyring; /* UID's default session keyring */ 546 #endif 547 548 /* Hash table maintenance information */ 549 struct hlist_node uidhash_node; 550 uid_t uid; 551 552 #ifdef CONFIG_FAIR_USER_SCHED 553 struct task_group *tg; 554 #ifdef CONFIG_SYSFS 555 struct kobject kobj; 556 struct work_struct work; 557 #endif 558 #endif 559 }; 560 561 extern int uids_sysfs_init(void); 562 563 extern struct user_struct *find_user(uid_t); 564 565 extern struct user_struct root_user; 566 #define INIT_USER (&root_user) 567 568 struct backing_dev_info; 569 struct reclaim_state; 570 571 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 572 struct sched_info { 573 /* cumulative counters */ 574 unsigned long pcount; /* # of times run on this cpu */ 575 unsigned long long cpu_time, /* time spent on the cpu */ 576 run_delay; /* time spent waiting on a runqueue */ 577 578 /* timestamps */ 579 unsigned long long last_arrival,/* when we last ran on a cpu */ 580 last_queued; /* when we were last queued to run */ 581 #ifdef CONFIG_SCHEDSTATS 582 /* BKL stats */ 583 unsigned int bkl_count; 584 #endif 585 }; 586 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 587 588 #ifdef CONFIG_SCHEDSTATS 589 extern const struct file_operations proc_schedstat_operations; 590 #endif /* CONFIG_SCHEDSTATS */ 591 592 #ifdef CONFIG_TASK_DELAY_ACCT 593 struct task_delay_info { 594 spinlock_t lock; 595 unsigned int flags; /* Private per-task flags */ 596 597 /* For each stat XXX, add following, aligned appropriately 598 * 599 * struct timespec XXX_start, XXX_end; 600 * u64 XXX_delay; 601 * u32 XXX_count; 602 * 603 * Atomicity of updates to XXX_delay, XXX_count protected by 604 * single lock above (split into XXX_lock if contention is an issue). 605 */ 606 607 /* 608 * XXX_count is incremented on every XXX operation, the delay 609 * associated with the operation is added to XXX_delay. 610 * XXX_delay contains the accumulated delay time in nanoseconds. 611 */ 612 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 613 u64 blkio_delay; /* wait for sync block io completion */ 614 u64 swapin_delay; /* wait for swapin block io completion */ 615 u32 blkio_count; /* total count of the number of sync block */ 616 /* io operations performed */ 617 u32 swapin_count; /* total count of the number of swapin block */ 618 /* io operations performed */ 619 }; 620 #endif /* CONFIG_TASK_DELAY_ACCT */ 621 622 static inline int sched_info_on(void) 623 { 624 #ifdef CONFIG_SCHEDSTATS 625 return 1; 626 #elif defined(CONFIG_TASK_DELAY_ACCT) 627 extern int delayacct_on; 628 return delayacct_on; 629 #else 630 return 0; 631 #endif 632 } 633 634 enum cpu_idle_type { 635 CPU_IDLE, 636 CPU_NOT_IDLE, 637 CPU_NEWLY_IDLE, 638 CPU_MAX_IDLE_TYPES 639 }; 640 641 /* 642 * sched-domains (multiprocessor balancing) declarations: 643 */ 644 645 /* 646 * Increase resolution of nice-level calculations: 647 */ 648 #define SCHED_LOAD_SHIFT 10 649 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 650 651 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE 652 653 #ifdef CONFIG_SMP 654 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 655 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 656 #define SD_BALANCE_EXEC 4 /* Balance on exec */ 657 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 658 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 659 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 660 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 661 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 662 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ 663 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ 664 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */ 665 666 #define BALANCE_FOR_MC_POWER \ 667 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0) 668 669 #define BALANCE_FOR_PKG_POWER \ 670 ((sched_mc_power_savings || sched_smt_power_savings) ? \ 671 SD_POWERSAVINGS_BALANCE : 0) 672 673 #define test_sd_parent(sd, flag) ((sd->parent && \ 674 (sd->parent->flags & flag)) ? 1 : 0) 675 676 677 struct sched_group { 678 struct sched_group *next; /* Must be a circular list */ 679 cpumask_t cpumask; 680 681 /* 682 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 683 * single CPU. This is read only (except for setup, hotplug CPU). 684 * Note : Never change cpu_power without recompute its reciprocal 685 */ 686 unsigned int __cpu_power; 687 /* 688 * reciprocal value of cpu_power to avoid expensive divides 689 * (see include/linux/reciprocal_div.h) 690 */ 691 u32 reciprocal_cpu_power; 692 }; 693 694 struct sched_domain { 695 /* These fields must be setup */ 696 struct sched_domain *parent; /* top domain must be null terminated */ 697 struct sched_domain *child; /* bottom domain must be null terminated */ 698 struct sched_group *groups; /* the balancing groups of the domain */ 699 cpumask_t span; /* span of all CPUs in this domain */ 700 unsigned long min_interval; /* Minimum balance interval ms */ 701 unsigned long max_interval; /* Maximum balance interval ms */ 702 unsigned int busy_factor; /* less balancing by factor if busy */ 703 unsigned int imbalance_pct; /* No balance until over watermark */ 704 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 705 unsigned int busy_idx; 706 unsigned int idle_idx; 707 unsigned int newidle_idx; 708 unsigned int wake_idx; 709 unsigned int forkexec_idx; 710 int flags; /* See SD_* */ 711 712 /* Runtime fields. */ 713 unsigned long last_balance; /* init to jiffies. units in jiffies */ 714 unsigned int balance_interval; /* initialise to 1. units in ms. */ 715 unsigned int nr_balance_failed; /* initialise to 0 */ 716 717 #ifdef CONFIG_SCHEDSTATS 718 /* load_balance() stats */ 719 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 720 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 721 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 722 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 723 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 724 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 725 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 726 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 727 728 /* Active load balancing */ 729 unsigned int alb_count; 730 unsigned int alb_failed; 731 unsigned int alb_pushed; 732 733 /* SD_BALANCE_EXEC stats */ 734 unsigned int sbe_count; 735 unsigned int sbe_balanced; 736 unsigned int sbe_pushed; 737 738 /* SD_BALANCE_FORK stats */ 739 unsigned int sbf_count; 740 unsigned int sbf_balanced; 741 unsigned int sbf_pushed; 742 743 /* try_to_wake_up() stats */ 744 unsigned int ttwu_wake_remote; 745 unsigned int ttwu_move_affine; 746 unsigned int ttwu_move_balance; 747 #endif 748 }; 749 750 extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new); 751 752 #endif /* CONFIG_SMP */ 753 754 /* 755 * A runqueue laden with a single nice 0 task scores a weighted_cpuload of 756 * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a 757 * task of nice 0 or enough lower priority tasks to bring up the 758 * weighted_cpuload 759 */ 760 static inline int above_background_load(void) 761 { 762 unsigned long cpu; 763 764 for_each_online_cpu(cpu) { 765 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE) 766 return 1; 767 } 768 return 0; 769 } 770 771 struct io_context; /* See blkdev.h */ 772 #define NGROUPS_SMALL 32 773 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) 774 struct group_info { 775 int ngroups; 776 atomic_t usage; 777 gid_t small_block[NGROUPS_SMALL]; 778 int nblocks; 779 gid_t *blocks[0]; 780 }; 781 782 /* 783 * get_group_info() must be called with the owning task locked (via task_lock()) 784 * when task != current. The reason being that the vast majority of callers are 785 * looking at current->group_info, which can not be changed except by the 786 * current task. Changing current->group_info requires the task lock, too. 787 */ 788 #define get_group_info(group_info) do { \ 789 atomic_inc(&(group_info)->usage); \ 790 } while (0) 791 792 #define put_group_info(group_info) do { \ 793 if (atomic_dec_and_test(&(group_info)->usage)) \ 794 groups_free(group_info); \ 795 } while (0) 796 797 extern struct group_info *groups_alloc(int gidsetsize); 798 extern void groups_free(struct group_info *group_info); 799 extern int set_current_groups(struct group_info *group_info); 800 extern int groups_search(struct group_info *group_info, gid_t grp); 801 /* access the groups "array" with this macro */ 802 #define GROUP_AT(gi, i) \ 803 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) 804 805 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 806 extern void prefetch_stack(struct task_struct *t); 807 #else 808 static inline void prefetch_stack(struct task_struct *t) { } 809 #endif 810 811 struct audit_context; /* See audit.c */ 812 struct mempolicy; 813 struct pipe_inode_info; 814 struct uts_namespace; 815 816 struct rq; 817 struct sched_domain; 818 819 struct sched_class { 820 const struct sched_class *next; 821 822 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); 823 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); 824 void (*yield_task) (struct rq *rq); 825 826 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p); 827 828 struct task_struct * (*pick_next_task) (struct rq *rq); 829 void (*put_prev_task) (struct rq *rq, struct task_struct *p); 830 831 #ifdef CONFIG_SMP 832 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, 833 struct rq *busiest, unsigned long max_load_move, 834 struct sched_domain *sd, enum cpu_idle_type idle, 835 int *all_pinned, int *this_best_prio); 836 837 int (*move_one_task) (struct rq *this_rq, int this_cpu, 838 struct rq *busiest, struct sched_domain *sd, 839 enum cpu_idle_type idle); 840 #endif 841 842 void (*set_curr_task) (struct rq *rq); 843 void (*task_tick) (struct rq *rq, struct task_struct *p); 844 void (*task_new) (struct rq *rq, struct task_struct *p); 845 }; 846 847 struct load_weight { 848 unsigned long weight, inv_weight; 849 }; 850 851 /* 852 * CFS stats for a schedulable entity (task, task-group etc) 853 * 854 * Current field usage histogram: 855 * 856 * 4 se->block_start 857 * 4 se->run_node 858 * 4 se->sleep_start 859 * 6 se->load.weight 860 */ 861 struct sched_entity { 862 struct load_weight load; /* for load-balancing */ 863 struct rb_node run_node; 864 unsigned int on_rq; 865 866 u64 exec_start; 867 u64 sum_exec_runtime; 868 u64 vruntime; 869 u64 prev_sum_exec_runtime; 870 871 #ifdef CONFIG_SCHEDSTATS 872 u64 wait_start; 873 u64 wait_max; 874 875 u64 sleep_start; 876 u64 sleep_max; 877 s64 sum_sleep_runtime; 878 879 u64 block_start; 880 u64 block_max; 881 u64 exec_max; 882 u64 slice_max; 883 884 u64 nr_migrations; 885 u64 nr_migrations_cold; 886 u64 nr_failed_migrations_affine; 887 u64 nr_failed_migrations_running; 888 u64 nr_failed_migrations_hot; 889 u64 nr_forced_migrations; 890 u64 nr_forced2_migrations; 891 892 u64 nr_wakeups; 893 u64 nr_wakeups_sync; 894 u64 nr_wakeups_migrate; 895 u64 nr_wakeups_local; 896 u64 nr_wakeups_remote; 897 u64 nr_wakeups_affine; 898 u64 nr_wakeups_affine_attempts; 899 u64 nr_wakeups_passive; 900 u64 nr_wakeups_idle; 901 #endif 902 903 #ifdef CONFIG_FAIR_GROUP_SCHED 904 struct sched_entity *parent; 905 /* rq on which this entity is (to be) queued: */ 906 struct cfs_rq *cfs_rq; 907 /* rq "owned" by this entity/group: */ 908 struct cfs_rq *my_q; 909 #endif 910 }; 911 912 struct task_struct { 913 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 914 void *stack; 915 atomic_t usage; 916 unsigned int flags; /* per process flags, defined below */ 917 unsigned int ptrace; 918 919 int lock_depth; /* BKL lock depth */ 920 921 #ifdef CONFIG_SMP 922 #ifdef __ARCH_WANT_UNLOCKED_CTXSW 923 int oncpu; 924 #endif 925 #endif 926 927 int prio, static_prio, normal_prio; 928 struct list_head run_list; 929 const struct sched_class *sched_class; 930 struct sched_entity se; 931 932 #ifdef CONFIG_PREEMPT_NOTIFIERS 933 /* list of struct preempt_notifier: */ 934 struct hlist_head preempt_notifiers; 935 #endif 936 937 unsigned short ioprio; 938 /* 939 * fpu_counter contains the number of consecutive context switches 940 * that the FPU is used. If this is over a threshold, the lazy fpu 941 * saving becomes unlazy to save the trap. This is an unsigned char 942 * so that after 256 times the counter wraps and the behavior turns 943 * lazy again; this to deal with bursty apps that only use FPU for 944 * a short time 945 */ 946 unsigned char fpu_counter; 947 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ 948 #ifdef CONFIG_BLK_DEV_IO_TRACE 949 unsigned int btrace_seq; 950 #endif 951 952 unsigned int policy; 953 cpumask_t cpus_allowed; 954 unsigned int time_slice; 955 956 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 957 struct sched_info sched_info; 958 #endif 959 960 struct list_head tasks; 961 /* 962 * ptrace_list/ptrace_children forms the list of my children 963 * that were stolen by a ptracer. 964 */ 965 struct list_head ptrace_children; 966 struct list_head ptrace_list; 967 968 struct mm_struct *mm, *active_mm; 969 970 /* task state */ 971 struct linux_binfmt *binfmt; 972 int exit_state; 973 int exit_code, exit_signal; 974 int pdeath_signal; /* The signal sent when the parent dies */ 975 /* ??? */ 976 unsigned int personality; 977 unsigned did_exec:1; 978 pid_t pid; 979 pid_t tgid; 980 981 #ifdef CONFIG_CC_STACKPROTECTOR 982 /* Canary value for the -fstack-protector gcc feature */ 983 unsigned long stack_canary; 984 #endif 985 /* 986 * pointers to (original) parent process, youngest child, younger sibling, 987 * older sibling, respectively. (p->father can be replaced with 988 * p->parent->pid) 989 */ 990 struct task_struct *real_parent; /* real parent process (when being debugged) */ 991 struct task_struct *parent; /* parent process */ 992 /* 993 * children/sibling forms the list of my children plus the 994 * tasks I'm ptracing. 995 */ 996 struct list_head children; /* list of my children */ 997 struct list_head sibling; /* linkage in my parent's children list */ 998 struct task_struct *group_leader; /* threadgroup leader */ 999 1000 /* PID/PID hash table linkage. */ 1001 struct pid_link pids[PIDTYPE_MAX]; 1002 struct list_head thread_group; 1003 1004 struct completion *vfork_done; /* for vfork() */ 1005 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1006 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1007 1008 unsigned int rt_priority; 1009 cputime_t utime, stime, utimescaled, stimescaled; 1010 cputime_t gtime; 1011 cputime_t prev_utime, prev_stime; 1012 unsigned long nvcsw, nivcsw; /* context switch counts */ 1013 struct timespec start_time; /* monotonic time */ 1014 struct timespec real_start_time; /* boot based time */ 1015 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1016 unsigned long min_flt, maj_flt; 1017 1018 cputime_t it_prof_expires, it_virt_expires; 1019 unsigned long long it_sched_expires; 1020 struct list_head cpu_timers[3]; 1021 1022 /* process credentials */ 1023 uid_t uid,euid,suid,fsuid; 1024 gid_t gid,egid,sgid,fsgid; 1025 struct group_info *group_info; 1026 kernel_cap_t cap_effective, cap_inheritable, cap_permitted; 1027 unsigned keep_capabilities:1; 1028 struct user_struct *user; 1029 #ifdef CONFIG_KEYS 1030 struct key *request_key_auth; /* assumed request_key authority */ 1031 struct key *thread_keyring; /* keyring private to this thread */ 1032 unsigned char jit_keyring; /* default keyring to attach requested keys to */ 1033 #endif 1034 char comm[TASK_COMM_LEN]; /* executable name excluding path 1035 - access with [gs]et_task_comm (which lock 1036 it with task_lock()) 1037 - initialized normally by flush_old_exec */ 1038 /* file system info */ 1039 int link_count, total_link_count; 1040 #ifdef CONFIG_SYSVIPC 1041 /* ipc stuff */ 1042 struct sysv_sem sysvsem; 1043 #endif 1044 /* CPU-specific state of this task */ 1045 struct thread_struct thread; 1046 /* filesystem information */ 1047 struct fs_struct *fs; 1048 /* open file information */ 1049 struct files_struct *files; 1050 /* namespaces */ 1051 struct nsproxy *nsproxy; 1052 /* signal handlers */ 1053 struct signal_struct *signal; 1054 struct sighand_struct *sighand; 1055 1056 sigset_t blocked, real_blocked; 1057 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */ 1058 struct sigpending pending; 1059 1060 unsigned long sas_ss_sp; 1061 size_t sas_ss_size; 1062 int (*notifier)(void *priv); 1063 void *notifier_data; 1064 sigset_t *notifier_mask; 1065 #ifdef CONFIG_SECURITY 1066 void *security; 1067 #endif 1068 struct audit_context *audit_context; 1069 seccomp_t seccomp; 1070 1071 /* Thread group tracking */ 1072 u32 parent_exec_id; 1073 u32 self_exec_id; 1074 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 1075 spinlock_t alloc_lock; 1076 1077 /* Protection of the PI data structures: */ 1078 spinlock_t pi_lock; 1079 1080 #ifdef CONFIG_RT_MUTEXES 1081 /* PI waiters blocked on a rt_mutex held by this task */ 1082 struct plist_head pi_waiters; 1083 /* Deadlock detection and priority inheritance handling */ 1084 struct rt_mutex_waiter *pi_blocked_on; 1085 #endif 1086 1087 #ifdef CONFIG_DEBUG_MUTEXES 1088 /* mutex deadlock detection */ 1089 struct mutex_waiter *blocked_on; 1090 #endif 1091 #ifdef CONFIG_TRACE_IRQFLAGS 1092 unsigned int irq_events; 1093 int hardirqs_enabled; 1094 unsigned long hardirq_enable_ip; 1095 unsigned int hardirq_enable_event; 1096 unsigned long hardirq_disable_ip; 1097 unsigned int hardirq_disable_event; 1098 int softirqs_enabled; 1099 unsigned long softirq_disable_ip; 1100 unsigned int softirq_disable_event; 1101 unsigned long softirq_enable_ip; 1102 unsigned int softirq_enable_event; 1103 int hardirq_context; 1104 int softirq_context; 1105 #endif 1106 #ifdef CONFIG_LOCKDEP 1107 # define MAX_LOCK_DEPTH 30UL 1108 u64 curr_chain_key; 1109 int lockdep_depth; 1110 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1111 unsigned int lockdep_recursion; 1112 #endif 1113 1114 /* journalling filesystem info */ 1115 void *journal_info; 1116 1117 /* stacked block device info */ 1118 struct bio *bio_list, **bio_tail; 1119 1120 /* VM state */ 1121 struct reclaim_state *reclaim_state; 1122 1123 struct backing_dev_info *backing_dev_info; 1124 1125 struct io_context *io_context; 1126 1127 unsigned long ptrace_message; 1128 siginfo_t *last_siginfo; /* For ptrace use. */ 1129 #ifdef CONFIG_TASK_XACCT 1130 /* i/o counters(bytes read/written, #syscalls */ 1131 u64 rchar, wchar, syscr, syscw; 1132 #endif 1133 struct task_io_accounting ioac; 1134 #if defined(CONFIG_TASK_XACCT) 1135 u64 acct_rss_mem1; /* accumulated rss usage */ 1136 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1137 cputime_t acct_stimexpd;/* stime since last update */ 1138 #endif 1139 #ifdef CONFIG_NUMA 1140 struct mempolicy *mempolicy; 1141 short il_next; 1142 #endif 1143 #ifdef CONFIG_CPUSETS 1144 nodemask_t mems_allowed; 1145 int cpuset_mems_generation; 1146 int cpuset_mem_spread_rotor; 1147 #endif 1148 #ifdef CONFIG_CGROUPS 1149 /* Control Group info protected by css_set_lock */ 1150 struct css_set *cgroups; 1151 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1152 struct list_head cg_list; 1153 #endif 1154 #ifdef CONFIG_FUTEX 1155 struct robust_list_head __user *robust_list; 1156 #ifdef CONFIG_COMPAT 1157 struct compat_robust_list_head __user *compat_robust_list; 1158 #endif 1159 struct list_head pi_state_list; 1160 struct futex_pi_state *pi_state_cache; 1161 #endif 1162 atomic_t fs_excl; /* holding fs exclusive resources */ 1163 struct rcu_head rcu; 1164 1165 /* 1166 * cache last used pipe for splice 1167 */ 1168 struct pipe_inode_info *splice_pipe; 1169 #ifdef CONFIG_TASK_DELAY_ACCT 1170 struct task_delay_info *delays; 1171 #endif 1172 #ifdef CONFIG_FAULT_INJECTION 1173 int make_it_fail; 1174 #endif 1175 struct prop_local_single dirties; 1176 }; 1177 1178 /* 1179 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1180 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1181 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1182 * values are inverted: lower p->prio value means higher priority. 1183 * 1184 * The MAX_USER_RT_PRIO value allows the actual maximum 1185 * RT priority to be separate from the value exported to 1186 * user-space. This allows kernel threads to set their 1187 * priority to a value higher than any user task. Note: 1188 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1189 */ 1190 1191 #define MAX_USER_RT_PRIO 100 1192 #define MAX_RT_PRIO MAX_USER_RT_PRIO 1193 1194 #define MAX_PRIO (MAX_RT_PRIO + 40) 1195 #define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1196 1197 static inline int rt_prio(int prio) 1198 { 1199 if (unlikely(prio < MAX_RT_PRIO)) 1200 return 1; 1201 return 0; 1202 } 1203 1204 static inline int rt_task(struct task_struct *p) 1205 { 1206 return rt_prio(p->prio); 1207 } 1208 1209 static inline void set_task_session(struct task_struct *tsk, pid_t session) 1210 { 1211 tsk->signal->__session = session; 1212 } 1213 1214 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp) 1215 { 1216 tsk->signal->__pgrp = pgrp; 1217 } 1218 1219 static inline struct pid *task_pid(struct task_struct *task) 1220 { 1221 return task->pids[PIDTYPE_PID].pid; 1222 } 1223 1224 static inline struct pid *task_tgid(struct task_struct *task) 1225 { 1226 return task->group_leader->pids[PIDTYPE_PID].pid; 1227 } 1228 1229 static inline struct pid *task_pgrp(struct task_struct *task) 1230 { 1231 return task->group_leader->pids[PIDTYPE_PGID].pid; 1232 } 1233 1234 static inline struct pid *task_session(struct task_struct *task) 1235 { 1236 return task->group_leader->pids[PIDTYPE_SID].pid; 1237 } 1238 1239 struct pid_namespace; 1240 1241 /* 1242 * the helpers to get the task's different pids as they are seen 1243 * from various namespaces 1244 * 1245 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1246 * task_xid_vnr() : virtual id, i.e. the id seen from the namespace the task 1247 * belongs to. this only makes sence when called in the 1248 * context of the task that belongs to the same namespace; 1249 * task_xid_nr_ns() : id seen from the ns specified; 1250 * 1251 * set_task_vxid() : assigns a virtual id to a task; 1252 * 1253 * see also pid_nr() etc in include/linux/pid.h 1254 */ 1255 1256 static inline pid_t task_pid_nr(struct task_struct *tsk) 1257 { 1258 return tsk->pid; 1259 } 1260 1261 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1262 1263 static inline pid_t task_pid_vnr(struct task_struct *tsk) 1264 { 1265 return pid_vnr(task_pid(tsk)); 1266 } 1267 1268 1269 static inline pid_t task_tgid_nr(struct task_struct *tsk) 1270 { 1271 return tsk->tgid; 1272 } 1273 1274 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1275 1276 static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1277 { 1278 return pid_vnr(task_tgid(tsk)); 1279 } 1280 1281 1282 static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1283 { 1284 return tsk->signal->__pgrp; 1285 } 1286 1287 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1288 1289 static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1290 { 1291 return pid_vnr(task_pgrp(tsk)); 1292 } 1293 1294 1295 static inline pid_t task_session_nr(struct task_struct *tsk) 1296 { 1297 return tsk->signal->__session; 1298 } 1299 1300 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1301 1302 static inline pid_t task_session_vnr(struct task_struct *tsk) 1303 { 1304 return pid_vnr(task_session(tsk)); 1305 } 1306 1307 1308 /** 1309 * pid_alive - check that a task structure is not stale 1310 * @p: Task structure to be checked. 1311 * 1312 * Test if a process is not yet dead (at most zombie state) 1313 * If pid_alive fails, then pointers within the task structure 1314 * can be stale and must not be dereferenced. 1315 */ 1316 static inline int pid_alive(struct task_struct *p) 1317 { 1318 return p->pids[PIDTYPE_PID].pid != NULL; 1319 } 1320 1321 /** 1322 * is_global_init - check if a task structure is init 1323 * @tsk: Task structure to be checked. 1324 * 1325 * Check if a task structure is the first user space task the kernel created. 1326 */ 1327 static inline int is_global_init(struct task_struct *tsk) 1328 { 1329 return tsk->pid == 1; 1330 } 1331 1332 /* 1333 * is_container_init: 1334 * check whether in the task is init in its own pid namespace. 1335 */ 1336 extern int is_container_init(struct task_struct *tsk); 1337 1338 extern struct pid *cad_pid; 1339 1340 extern void free_task(struct task_struct *tsk); 1341 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1342 1343 extern void __put_task_struct(struct task_struct *t); 1344 1345 static inline void put_task_struct(struct task_struct *t) 1346 { 1347 if (atomic_dec_and_test(&t->usage)) 1348 __put_task_struct(t); 1349 } 1350 1351 /* 1352 * Per process flags 1353 */ 1354 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 1355 /* Not implemented yet, only for 486*/ 1356 #define PF_STARTING 0x00000002 /* being created */ 1357 #define PF_EXITING 0x00000004 /* getting shut down */ 1358 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1359 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1360 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1361 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1362 #define PF_DUMPCORE 0x00000200 /* dumped core */ 1363 #define PF_SIGNALED 0x00000400 /* killed by a signal */ 1364 #define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1365 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 1366 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1367 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1368 #define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1369 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1370 #define PF_KSWAPD 0x00040000 /* I am kswapd */ 1371 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 1372 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1373 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */ 1374 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1375 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1376 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1377 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1378 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1379 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1380 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1381 1382 /* 1383 * Only the _current_ task can read/write to tsk->flags, but other 1384 * tasks can access tsk->flags in readonly mode for example 1385 * with tsk_used_math (like during threaded core dumping). 1386 * There is however an exception to this rule during ptrace 1387 * or during fork: the ptracer task is allowed to write to the 1388 * child->flags of its traced child (same goes for fork, the parent 1389 * can write to the child->flags), because we're guaranteed the 1390 * child is not running and in turn not changing child->flags 1391 * at the same time the parent does it. 1392 */ 1393 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1394 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1395 #define clear_used_math() clear_stopped_child_used_math(current) 1396 #define set_used_math() set_stopped_child_used_math(current) 1397 #define conditional_stopped_child_used_math(condition, child) \ 1398 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1399 #define conditional_used_math(condition) \ 1400 conditional_stopped_child_used_math(condition, current) 1401 #define copy_to_stopped_child_used_math(child) \ 1402 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1403 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1404 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1405 #define used_math() tsk_used_math(current) 1406 1407 #ifdef CONFIG_SMP 1408 extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask); 1409 #else 1410 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1411 { 1412 if (!cpu_isset(0, new_mask)) 1413 return -EINVAL; 1414 return 0; 1415 } 1416 #endif 1417 1418 extern unsigned long long sched_clock(void); 1419 1420 /* 1421 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1422 * clock constructed from sched_clock(): 1423 */ 1424 extern unsigned long long cpu_clock(int cpu); 1425 1426 extern unsigned long long 1427 task_sched_runtime(struct task_struct *task); 1428 1429 /* sched_exec is called by processes performing an exec */ 1430 #ifdef CONFIG_SMP 1431 extern void sched_exec(void); 1432 #else 1433 #define sched_exec() {} 1434 #endif 1435 1436 extern void sched_clock_idle_sleep_event(void); 1437 extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1438 1439 #ifdef CONFIG_HOTPLUG_CPU 1440 extern void idle_task_exit(void); 1441 #else 1442 static inline void idle_task_exit(void) {} 1443 #endif 1444 1445 extern void sched_idle_next(void); 1446 1447 #ifdef CONFIG_SCHED_DEBUG 1448 extern unsigned int sysctl_sched_latency; 1449 extern unsigned int sysctl_sched_min_granularity; 1450 extern unsigned int sysctl_sched_wakeup_granularity; 1451 extern unsigned int sysctl_sched_batch_wakeup_granularity; 1452 extern unsigned int sysctl_sched_child_runs_first; 1453 extern unsigned int sysctl_sched_features; 1454 extern unsigned int sysctl_sched_migration_cost; 1455 extern unsigned int sysctl_sched_nr_migrate; 1456 1457 int sched_nr_latency_handler(struct ctl_table *table, int write, 1458 struct file *file, void __user *buffer, size_t *length, 1459 loff_t *ppos); 1460 #endif 1461 1462 extern unsigned int sysctl_sched_compat_yield; 1463 1464 #ifdef CONFIG_RT_MUTEXES 1465 extern int rt_mutex_getprio(struct task_struct *p); 1466 extern void rt_mutex_setprio(struct task_struct *p, int prio); 1467 extern void rt_mutex_adjust_pi(struct task_struct *p); 1468 #else 1469 static inline int rt_mutex_getprio(struct task_struct *p) 1470 { 1471 return p->normal_prio; 1472 } 1473 # define rt_mutex_adjust_pi(p) do { } while (0) 1474 #endif 1475 1476 extern void set_user_nice(struct task_struct *p, long nice); 1477 extern int task_prio(const struct task_struct *p); 1478 extern int task_nice(const struct task_struct *p); 1479 extern int can_nice(const struct task_struct *p, const int nice); 1480 extern int task_curr(const struct task_struct *p); 1481 extern int idle_cpu(int cpu); 1482 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1483 extern struct task_struct *idle_task(int cpu); 1484 extern struct task_struct *curr_task(int cpu); 1485 extern void set_curr_task(int cpu, struct task_struct *p); 1486 1487 void yield(void); 1488 1489 /* 1490 * The default (Linux) execution domain. 1491 */ 1492 extern struct exec_domain default_exec_domain; 1493 1494 union thread_union { 1495 struct thread_info thread_info; 1496 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1497 }; 1498 1499 #ifndef __HAVE_ARCH_KSTACK_END 1500 static inline int kstack_end(void *addr) 1501 { 1502 /* Reliable end of stack detection: 1503 * Some APM bios versions misalign the stack 1504 */ 1505 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1506 } 1507 #endif 1508 1509 extern union thread_union init_thread_union; 1510 extern struct task_struct init_task; 1511 1512 extern struct mm_struct init_mm; 1513 1514 extern struct pid_namespace init_pid_ns; 1515 1516 /* 1517 * find a task by one of its numerical ids 1518 * 1519 * find_task_by_pid_type_ns(): 1520 * it is the most generic call - it finds a task by all id, 1521 * type and namespace specified 1522 * find_task_by_pid_ns(): 1523 * finds a task by its pid in the specified namespace 1524 * find_task_by_vpid(): 1525 * finds a task by its virtual pid 1526 * find_task_by_pid(): 1527 * finds a task by its global pid 1528 * 1529 * see also find_pid() etc in include/linux/pid.h 1530 */ 1531 1532 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid, 1533 struct pid_namespace *ns); 1534 1535 extern struct task_struct *find_task_by_pid(pid_t nr); 1536 extern struct task_struct *find_task_by_vpid(pid_t nr); 1537 extern struct task_struct *find_task_by_pid_ns(pid_t nr, 1538 struct pid_namespace *ns); 1539 1540 extern void __set_special_pids(pid_t session, pid_t pgrp); 1541 1542 /* per-UID process charging. */ 1543 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 1544 static inline struct user_struct *get_uid(struct user_struct *u) 1545 { 1546 atomic_inc(&u->__count); 1547 return u; 1548 } 1549 extern void free_uid(struct user_struct *); 1550 extern void switch_uid(struct user_struct *); 1551 extern void release_uids(struct user_namespace *ns); 1552 1553 #include <asm/current.h> 1554 1555 extern void do_timer(unsigned long ticks); 1556 1557 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); 1558 extern int FASTCALL(wake_up_process(struct task_struct * tsk)); 1559 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, 1560 unsigned long clone_flags)); 1561 #ifdef CONFIG_SMP 1562 extern void kick_process(struct task_struct *tsk); 1563 #else 1564 static inline void kick_process(struct task_struct *tsk) { } 1565 #endif 1566 extern void sched_fork(struct task_struct *p, int clone_flags); 1567 extern void sched_dead(struct task_struct *p); 1568 1569 extern int in_group_p(gid_t); 1570 extern int in_egroup_p(gid_t); 1571 1572 extern void proc_caches_init(void); 1573 extern void flush_signals(struct task_struct *); 1574 extern void ignore_signals(struct task_struct *); 1575 extern void flush_signal_handlers(struct task_struct *, int force_default); 1576 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 1577 1578 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 1579 { 1580 unsigned long flags; 1581 int ret; 1582 1583 spin_lock_irqsave(&tsk->sighand->siglock, flags); 1584 ret = dequeue_signal(tsk, mask, info); 1585 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 1586 1587 return ret; 1588 } 1589 1590 extern void block_all_signals(int (*notifier)(void *priv), void *priv, 1591 sigset_t *mask); 1592 extern void unblock_all_signals(void); 1593 extern void release_task(struct task_struct * p); 1594 extern int send_sig_info(int, struct siginfo *, struct task_struct *); 1595 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); 1596 extern int force_sigsegv(int, struct task_struct *); 1597 extern int force_sig_info(int, struct siginfo *, struct task_struct *); 1598 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1599 extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1600 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 1601 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 1602 extern int kill_pgrp(struct pid *pid, int sig, int priv); 1603 extern int kill_pid(struct pid *pid, int sig, int priv); 1604 extern int kill_proc_info(int, struct siginfo *, pid_t); 1605 extern void do_notify_parent(struct task_struct *, int); 1606 extern void force_sig(int, struct task_struct *); 1607 extern void force_sig_specific(int, struct task_struct *); 1608 extern int send_sig(int, struct task_struct *, int); 1609 extern void zap_other_threads(struct task_struct *p); 1610 extern int kill_proc(pid_t, int, int); 1611 extern struct sigqueue *sigqueue_alloc(void); 1612 extern void sigqueue_free(struct sigqueue *); 1613 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); 1614 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); 1615 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 1616 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 1617 1618 static inline int kill_cad_pid(int sig, int priv) 1619 { 1620 return kill_pid(cad_pid, sig, priv); 1621 } 1622 1623 /* These can be the second arg to send_sig_info/send_group_sig_info. */ 1624 #define SEND_SIG_NOINFO ((struct siginfo *) 0) 1625 #define SEND_SIG_PRIV ((struct siginfo *) 1) 1626 #define SEND_SIG_FORCED ((struct siginfo *) 2) 1627 1628 static inline int is_si_special(const struct siginfo *info) 1629 { 1630 return info <= SEND_SIG_FORCED; 1631 } 1632 1633 /* True if we are on the alternate signal stack. */ 1634 1635 static inline int on_sig_stack(unsigned long sp) 1636 { 1637 return (sp - current->sas_ss_sp < current->sas_ss_size); 1638 } 1639 1640 static inline int sas_ss_flags(unsigned long sp) 1641 { 1642 return (current->sas_ss_size == 0 ? SS_DISABLE 1643 : on_sig_stack(sp) ? SS_ONSTACK : 0); 1644 } 1645 1646 /* 1647 * Routines for handling mm_structs 1648 */ 1649 extern struct mm_struct * mm_alloc(void); 1650 1651 /* mmdrop drops the mm and the page tables */ 1652 extern void FASTCALL(__mmdrop(struct mm_struct *)); 1653 static inline void mmdrop(struct mm_struct * mm) 1654 { 1655 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 1656 __mmdrop(mm); 1657 } 1658 1659 /* mmput gets rid of the mappings and all user-space */ 1660 extern void mmput(struct mm_struct *); 1661 /* Grab a reference to a task's mm, if it is not already going away */ 1662 extern struct mm_struct *get_task_mm(struct task_struct *task); 1663 /* Remove the current tasks stale references to the old mm_struct */ 1664 extern void mm_release(struct task_struct *, struct mm_struct *); 1665 1666 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 1667 extern void flush_thread(void); 1668 extern void exit_thread(void); 1669 1670 extern void exit_files(struct task_struct *); 1671 extern void __cleanup_signal(struct signal_struct *); 1672 extern void __cleanup_sighand(struct sighand_struct *); 1673 extern void exit_itimers(struct signal_struct *); 1674 1675 extern NORET_TYPE void do_group_exit(int); 1676 1677 extern void daemonize(const char *, ...); 1678 extern int allow_signal(int); 1679 extern int disallow_signal(int); 1680 1681 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 1682 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 1683 struct task_struct *fork_idle(int); 1684 1685 extern void set_task_comm(struct task_struct *tsk, char *from); 1686 extern void get_task_comm(char *to, struct task_struct *tsk); 1687 1688 #ifdef CONFIG_SMP 1689 extern void wait_task_inactive(struct task_struct * p); 1690 #else 1691 #define wait_task_inactive(p) do { } while (0) 1692 #endif 1693 1694 #define remove_parent(p) list_del_init(&(p)->sibling) 1695 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children) 1696 1697 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) 1698 1699 #define for_each_process(p) \ 1700 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 1701 1702 /* 1703 * Careful: do_each_thread/while_each_thread is a double loop so 1704 * 'break' will not work as expected - use goto instead. 1705 */ 1706 #define do_each_thread(g, t) \ 1707 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 1708 1709 #define while_each_thread(g, t) \ 1710 while ((t = next_thread(t)) != g) 1711 1712 /* de_thread depends on thread_group_leader not being a pid based check */ 1713 #define thread_group_leader(p) (p == p->group_leader) 1714 1715 /* Do to the insanities of de_thread it is possible for a process 1716 * to have the pid of the thread group leader without actually being 1717 * the thread group leader. For iteration through the pids in proc 1718 * all we care about is that we have a task with the appropriate 1719 * pid, we don't actually care if we have the right task. 1720 */ 1721 static inline int has_group_leader_pid(struct task_struct *p) 1722 { 1723 return p->pid == p->tgid; 1724 } 1725 1726 static inline 1727 int same_thread_group(struct task_struct *p1, struct task_struct *p2) 1728 { 1729 return p1->tgid == p2->tgid; 1730 } 1731 1732 static inline struct task_struct *next_thread(const struct task_struct *p) 1733 { 1734 return list_entry(rcu_dereference(p->thread_group.next), 1735 struct task_struct, thread_group); 1736 } 1737 1738 static inline int thread_group_empty(struct task_struct *p) 1739 { 1740 return list_empty(&p->thread_group); 1741 } 1742 1743 #define delay_group_leader(p) \ 1744 (thread_group_leader(p) && !thread_group_empty(p)) 1745 1746 /* 1747 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 1748 * subscriptions and synchronises with wait4(). Also used in procfs. Also 1749 * pins the final release of task.io_context. Also protects ->cpuset and 1750 * ->cgroup.subsys[]. 1751 * 1752 * Nests both inside and outside of read_lock(&tasklist_lock). 1753 * It must not be nested with write_lock_irq(&tasklist_lock), 1754 * neither inside nor outside. 1755 */ 1756 static inline void task_lock(struct task_struct *p) 1757 { 1758 spin_lock(&p->alloc_lock); 1759 } 1760 1761 static inline void task_unlock(struct task_struct *p) 1762 { 1763 spin_unlock(&p->alloc_lock); 1764 } 1765 1766 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 1767 unsigned long *flags); 1768 1769 static inline void unlock_task_sighand(struct task_struct *tsk, 1770 unsigned long *flags) 1771 { 1772 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 1773 } 1774 1775 #ifndef __HAVE_THREAD_FUNCTIONS 1776 1777 #define task_thread_info(task) ((struct thread_info *)(task)->stack) 1778 #define task_stack_page(task) ((task)->stack) 1779 1780 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 1781 { 1782 *task_thread_info(p) = *task_thread_info(org); 1783 task_thread_info(p)->task = p; 1784 } 1785 1786 static inline unsigned long *end_of_stack(struct task_struct *p) 1787 { 1788 return (unsigned long *)(task_thread_info(p) + 1); 1789 } 1790 1791 #endif 1792 1793 /* set thread flags in other task's structures 1794 * - see asm/thread_info.h for TIF_xxxx flags available 1795 */ 1796 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 1797 { 1798 set_ti_thread_flag(task_thread_info(tsk), flag); 1799 } 1800 1801 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1802 { 1803 clear_ti_thread_flag(task_thread_info(tsk), flag); 1804 } 1805 1806 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 1807 { 1808 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 1809 } 1810 1811 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1812 { 1813 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 1814 } 1815 1816 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 1817 { 1818 return test_ti_thread_flag(task_thread_info(tsk), flag); 1819 } 1820 1821 static inline void set_tsk_need_resched(struct task_struct *tsk) 1822 { 1823 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1824 } 1825 1826 static inline void clear_tsk_need_resched(struct task_struct *tsk) 1827 { 1828 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1829 } 1830 1831 static inline int signal_pending(struct task_struct *p) 1832 { 1833 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 1834 } 1835 1836 static inline int need_resched(void) 1837 { 1838 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 1839 } 1840 1841 /* 1842 * cond_resched() and cond_resched_lock(): latency reduction via 1843 * explicit rescheduling in places that are safe. The return 1844 * value indicates whether a reschedule was done in fact. 1845 * cond_resched_lock() will drop the spinlock before scheduling, 1846 * cond_resched_softirq() will enable bhs before scheduling. 1847 */ 1848 extern int cond_resched(void); 1849 extern int cond_resched_lock(spinlock_t * lock); 1850 extern int cond_resched_softirq(void); 1851 1852 /* 1853 * Does a critical section need to be broken due to another 1854 * task waiting?: 1855 */ 1856 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) 1857 # define need_lockbreak(lock) ((lock)->break_lock) 1858 #else 1859 # define need_lockbreak(lock) 0 1860 #endif 1861 1862 /* 1863 * Does a critical section need to be broken due to another 1864 * task waiting or preemption being signalled: 1865 */ 1866 static inline int lock_need_resched(spinlock_t *lock) 1867 { 1868 if (need_lockbreak(lock) || need_resched()) 1869 return 1; 1870 return 0; 1871 } 1872 1873 /* 1874 * Reevaluate whether the task has signals pending delivery. 1875 * Wake the task if so. 1876 * This is required every time the blocked sigset_t changes. 1877 * callers must hold sighand->siglock. 1878 */ 1879 extern void recalc_sigpending_and_wake(struct task_struct *t); 1880 extern void recalc_sigpending(void); 1881 1882 extern void signal_wake_up(struct task_struct *t, int resume_stopped); 1883 1884 /* 1885 * Wrappers for p->thread_info->cpu access. No-op on UP. 1886 */ 1887 #ifdef CONFIG_SMP 1888 1889 static inline unsigned int task_cpu(const struct task_struct *p) 1890 { 1891 return task_thread_info(p)->cpu; 1892 } 1893 1894 extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 1895 1896 #else 1897 1898 static inline unsigned int task_cpu(const struct task_struct *p) 1899 { 1900 return 0; 1901 } 1902 1903 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 1904 { 1905 } 1906 1907 #endif /* CONFIG_SMP */ 1908 1909 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1910 extern void arch_pick_mmap_layout(struct mm_struct *mm); 1911 #else 1912 static inline void arch_pick_mmap_layout(struct mm_struct *mm) 1913 { 1914 mm->mmap_base = TASK_UNMAPPED_BASE; 1915 mm->get_unmapped_area = arch_get_unmapped_area; 1916 mm->unmap_area = arch_unmap_area; 1917 } 1918 #endif 1919 1920 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); 1921 extern long sched_getaffinity(pid_t pid, cpumask_t *mask); 1922 1923 extern int sched_mc_power_savings, sched_smt_power_savings; 1924 1925 extern void normalize_rt_tasks(void); 1926 1927 #ifdef CONFIG_FAIR_GROUP_SCHED 1928 1929 extern struct task_group init_task_group; 1930 1931 extern struct task_group *sched_create_group(void); 1932 extern void sched_destroy_group(struct task_group *tg); 1933 extern void sched_move_task(struct task_struct *tsk); 1934 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 1935 extern unsigned long sched_group_shares(struct task_group *tg); 1936 1937 #endif 1938 1939 #ifdef CONFIG_TASK_XACCT 1940 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 1941 { 1942 tsk->rchar += amt; 1943 } 1944 1945 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 1946 { 1947 tsk->wchar += amt; 1948 } 1949 1950 static inline void inc_syscr(struct task_struct *tsk) 1951 { 1952 tsk->syscr++; 1953 } 1954 1955 static inline void inc_syscw(struct task_struct *tsk) 1956 { 1957 tsk->syscw++; 1958 } 1959 #else 1960 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 1961 { 1962 } 1963 1964 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 1965 { 1966 } 1967 1968 static inline void inc_syscr(struct task_struct *tsk) 1969 { 1970 } 1971 1972 static inline void inc_syscw(struct task_struct *tsk) 1973 { 1974 } 1975 #endif 1976 1977 #ifdef CONFIG_SMP 1978 void migration_init(void); 1979 #else 1980 static inline void migration_init(void) 1981 { 1982 } 1983 #endif 1984 1985 #endif /* __KERNEL__ */ 1986 1987 #endif 1988