1#ifndef _LINUX_SCHED_H 2#define _LINUX_SCHED_H 3 4#include <linux/auxvec.h> /* For AT_VECTOR_SIZE */ 5 6/* 7 * cloning flags: 8 */ 9#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ 10#define CLONE_VM 0x00000100 /* set if VM shared between processes */ 11#define CLONE_FS 0x00000200 /* set if fs info shared between processes */ 12#define CLONE_FILES 0x00000400 /* set if open files shared between processes */ 13#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ 14#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ 15#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ 16#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ 17#define CLONE_THREAD 0x00010000 /* Same thread group? */ 18#define CLONE_NEWNS 0x00020000 /* New namespace group? */ 19#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ 20#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ 21#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ 22#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ 23#define CLONE_DETACHED 0x00400000 /* Unused, ignored */ 24#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ 25#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ 26#define CLONE_STOPPED 0x02000000 /* Start in stopped state */ 27 28/* 29 * Scheduling policies 30 */ 31#define SCHED_NORMAL 0 32#define SCHED_FIFO 1 33#define SCHED_RR 2 34#define SCHED_BATCH 3 35 36#ifdef __KERNEL__ 37 38struct sched_param { 39 int sched_priority; 40}; 41 42#include <asm/param.h> /* for HZ */ 43 44#include <linux/capability.h> 45#include <linux/threads.h> 46#include <linux/kernel.h> 47#include <linux/types.h> 48#include <linux/timex.h> 49#include <linux/jiffies.h> 50#include <linux/rbtree.h> 51#include <linux/thread_info.h> 52#include <linux/cpumask.h> 53#include <linux/errno.h> 54#include <linux/nodemask.h> 55 56#include <asm/system.h> 57#include <asm/semaphore.h> 58#include <asm/page.h> 59#include <asm/ptrace.h> 60#include <asm/mmu.h> 61#include <asm/cputime.h> 62 63#include <linux/smp.h> 64#include <linux/sem.h> 65#include <linux/signal.h> 66#include <linux/securebits.h> 67#include <linux/fs_struct.h> 68#include <linux/compiler.h> 69#include <linux/completion.h> 70#include <linux/pid.h> 71#include <linux/percpu.h> 72#include <linux/topology.h> 73#include <linux/seccomp.h> 74#include <linux/rcupdate.h> 75#include <linux/futex.h> 76#include <linux/rtmutex.h> 77 78#include <linux/time.h> 79#include <linux/param.h> 80#include <linux/resource.h> 81#include <linux/timer.h> 82#include <linux/hrtimer.h> 83 84#include <asm/processor.h> 85 86struct exec_domain; 87struct futex_pi_state; 88 89/* 90 * List of flags we want to share for kernel threads, 91 * if only because they are not used by them anyway. 92 */ 93#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 94 95/* 96 * These are the constant used to fake the fixed-point load-average 97 * counting. Some notes: 98 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 99 * a load-average precision of 10 bits integer + 11 bits fractional 100 * - if you want to count load-averages more often, you need more 101 * precision, or rounding will get you. With 2-second counting freq, 102 * the EXP_n values would be 1981, 2034 and 2043 if still using only 103 * 11 bit fractions. 104 */ 105extern unsigned long avenrun[]; /* Load averages */ 106 107#define FSHIFT 11 /* nr of bits of precision */ 108#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 109#define LOAD_FREQ (5*HZ) /* 5 sec intervals */ 110#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 111#define EXP_5 2014 /* 1/exp(5sec/5min) */ 112#define EXP_15 2037 /* 1/exp(5sec/15min) */ 113 114#define CALC_LOAD(load,exp,n) \ 115 load *= exp; \ 116 load += n*(FIXED_1-exp); \ 117 load >>= FSHIFT; 118 119extern unsigned long total_forks; 120extern int nr_threads; 121extern int last_pid; 122DECLARE_PER_CPU(unsigned long, process_counts); 123extern int nr_processes(void); 124extern unsigned long nr_running(void); 125extern unsigned long nr_uninterruptible(void); 126extern unsigned long nr_active(void); 127extern unsigned long nr_iowait(void); 128extern unsigned long weighted_cpuload(const int cpu); 129 130 131/* 132 * Task state bitmask. NOTE! These bits are also 133 * encoded in fs/proc/array.c: get_task_state(). 134 * 135 * We have two separate sets of flags: task->state 136 * is about runnability, while task->exit_state are 137 * about the task exiting. Confusing, but this way 138 * modifying one set can't modify the other one by 139 * mistake. 140 */ 141#define TASK_RUNNING 0 142#define TASK_INTERRUPTIBLE 1 143#define TASK_UNINTERRUPTIBLE 2 144#define TASK_STOPPED 4 145#define TASK_TRACED 8 146/* in tsk->exit_state */ 147#define EXIT_ZOMBIE 16 148#define EXIT_DEAD 32 149/* in tsk->state again */ 150#define TASK_NONINTERACTIVE 64 151 152#define __set_task_state(tsk, state_value) \ 153 do { (tsk)->state = (state_value); } while (0) 154#define set_task_state(tsk, state_value) \ 155 set_mb((tsk)->state, (state_value)) 156 157/* 158 * set_current_state() includes a barrier so that the write of current->state 159 * is correctly serialised wrt the caller's subsequent test of whether to 160 * actually sleep: 161 * 162 * set_current_state(TASK_UNINTERRUPTIBLE); 163 * if (do_i_need_to_sleep()) 164 * schedule(); 165 * 166 * If the caller does not need such serialisation then use __set_current_state() 167 */ 168#define __set_current_state(state_value) \ 169 do { current->state = (state_value); } while (0) 170#define set_current_state(state_value) \ 171 set_mb(current->state, (state_value)) 172 173/* Task command name length */ 174#define TASK_COMM_LEN 16 175 176#include <linux/spinlock.h> 177 178/* 179 * This serializes "schedule()" and also protects 180 * the run-queue from deletions/modifications (but 181 * _adding_ to the beginning of the run-queue has 182 * a separate lock). 183 */ 184extern rwlock_t tasklist_lock; 185extern spinlock_t mmlist_lock; 186 187struct task_struct; 188 189extern void sched_init(void); 190extern void sched_init_smp(void); 191extern void init_idle(struct task_struct *idle, int cpu); 192 193extern cpumask_t nohz_cpu_mask; 194 195extern void show_state(void); 196extern void show_regs(struct pt_regs *); 197 198/* 199 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 200 * task), SP is the stack pointer of the first frame that should be shown in the back 201 * trace (or NULL if the entire call-chain of the task should be shown). 202 */ 203extern void show_stack(struct task_struct *task, unsigned long *sp); 204 205void io_schedule(void); 206long io_schedule_timeout(long timeout); 207 208extern void cpu_init (void); 209extern void trap_init(void); 210extern void update_process_times(int user); 211extern void scheduler_tick(void); 212 213#ifdef CONFIG_DETECT_SOFTLOCKUP 214extern void softlockup_tick(void); 215extern void spawn_softlockup_task(void); 216extern void touch_softlockup_watchdog(void); 217#else 218static inline void softlockup_tick(void) 219{ 220} 221static inline void spawn_softlockup_task(void) 222{ 223} 224static inline void touch_softlockup_watchdog(void) 225{ 226} 227#endif 228 229 230/* Attach to any functions which should be ignored in wchan output. */ 231#define __sched __attribute__((__section__(".sched.text"))) 232/* Is this address in the __sched functions? */ 233extern int in_sched_functions(unsigned long addr); 234 235#define MAX_SCHEDULE_TIMEOUT LONG_MAX 236extern signed long FASTCALL(schedule_timeout(signed long timeout)); 237extern signed long schedule_timeout_interruptible(signed long timeout); 238extern signed long schedule_timeout_uninterruptible(signed long timeout); 239asmlinkage void schedule(void); 240 241struct namespace; 242 243/* Maximum number of active map areas.. This is a random (large) number */ 244#define DEFAULT_MAX_MAP_COUNT 65536 245 246extern int sysctl_max_map_count; 247 248#include <linux/aio.h> 249 250extern unsigned long 251arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 252 unsigned long, unsigned long); 253extern unsigned long 254arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 255 unsigned long len, unsigned long pgoff, 256 unsigned long flags); 257extern void arch_unmap_area(struct mm_struct *, unsigned long); 258extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 259 260#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS 261/* 262 * The mm counters are not protected by its page_table_lock, 263 * so must be incremented atomically. 264 */ 265#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) 266#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) 267#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) 268#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) 269#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) 270typedef atomic_long_t mm_counter_t; 271 272#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 273/* 274 * The mm counters are protected by its page_table_lock, 275 * so can be incremented directly. 276 */ 277#define set_mm_counter(mm, member, value) (mm)->_##member = (value) 278#define get_mm_counter(mm, member) ((mm)->_##member) 279#define add_mm_counter(mm, member, value) (mm)->_##member += (value) 280#define inc_mm_counter(mm, member) (mm)->_##member++ 281#define dec_mm_counter(mm, member) (mm)->_##member-- 282typedef unsigned long mm_counter_t; 283 284#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 285 286#define get_mm_rss(mm) \ 287 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) 288#define update_hiwater_rss(mm) do { \ 289 unsigned long _rss = get_mm_rss(mm); \ 290 if ((mm)->hiwater_rss < _rss) \ 291 (mm)->hiwater_rss = _rss; \ 292} while (0) 293#define update_hiwater_vm(mm) do { \ 294 if ((mm)->hiwater_vm < (mm)->total_vm) \ 295 (mm)->hiwater_vm = (mm)->total_vm; \ 296} while (0) 297 298struct mm_struct { 299 struct vm_area_struct * mmap; /* list of VMAs */ 300 struct rb_root mm_rb; 301 struct vm_area_struct * mmap_cache; /* last find_vma result */ 302 unsigned long (*get_unmapped_area) (struct file *filp, 303 unsigned long addr, unsigned long len, 304 unsigned long pgoff, unsigned long flags); 305 void (*unmap_area) (struct mm_struct *mm, unsigned long addr); 306 unsigned long mmap_base; /* base of mmap area */ 307 unsigned long task_size; /* size of task vm space */ 308 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ 309 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ 310 pgd_t * pgd; 311 atomic_t mm_users; /* How many users with user space? */ 312 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ 313 int map_count; /* number of VMAs */ 314 struct rw_semaphore mmap_sem; 315 spinlock_t page_table_lock; /* Protects page tables and some counters */ 316 317 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung 318 * together off init_mm.mmlist, and are protected 319 * by mmlist_lock 320 */ 321 322 /* Special counters, in some configurations protected by the 323 * page_table_lock, in other configurations by being atomic. 324 */ 325 mm_counter_t _file_rss; 326 mm_counter_t _anon_rss; 327 328 unsigned long hiwater_rss; /* High-watermark of RSS usage */ 329 unsigned long hiwater_vm; /* High-water virtual memory usage */ 330 331 unsigned long total_vm, locked_vm, shared_vm, exec_vm; 332 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; 333 unsigned long start_code, end_code, start_data, end_data; 334 unsigned long start_brk, brk, start_stack; 335 unsigned long arg_start, arg_end, env_start, env_end; 336 337 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ 338 339 unsigned dumpable:2; 340 cpumask_t cpu_vm_mask; 341 342 /* Architecture-specific MM context */ 343 mm_context_t context; 344 345 /* Token based thrashing protection. */ 346 unsigned long swap_token_time; 347 char recent_pagein; 348 349 /* coredumping support */ 350 int core_waiters; 351 struct completion *core_startup_done, core_done; 352 353 /* aio bits */ 354 rwlock_t ioctx_list_lock; 355 struct kioctx *ioctx_list; 356}; 357 358struct sighand_struct { 359 atomic_t count; 360 struct k_sigaction action[_NSIG]; 361 spinlock_t siglock; 362}; 363 364struct pacct_struct { 365 int ac_flag; 366 long ac_exitcode; 367 unsigned long ac_mem; 368 cputime_t ac_utime, ac_stime; 369 unsigned long ac_minflt, ac_majflt; 370}; 371 372/* 373 * NOTE! "signal_struct" does not have it's own 374 * locking, because a shared signal_struct always 375 * implies a shared sighand_struct, so locking 376 * sighand_struct is always a proper superset of 377 * the locking of signal_struct. 378 */ 379struct signal_struct { 380 atomic_t count; 381 atomic_t live; 382 383 wait_queue_head_t wait_chldexit; /* for wait4() */ 384 385 /* current thread group signal load-balancing target: */ 386 struct task_struct *curr_target; 387 388 /* shared signal handling: */ 389 struct sigpending shared_pending; 390 391 /* thread group exit support */ 392 int group_exit_code; 393 /* overloaded: 394 * - notify group_exit_task when ->count is equal to notify_count 395 * - everyone except group_exit_task is stopped during signal delivery 396 * of fatal signals, group_exit_task processes the signal. 397 */ 398 struct task_struct *group_exit_task; 399 int notify_count; 400 401 /* thread group stop support, overloads group_exit_code too */ 402 int group_stop_count; 403 unsigned int flags; /* see SIGNAL_* flags below */ 404 405 /* POSIX.1b Interval Timers */ 406 struct list_head posix_timers; 407 408 /* ITIMER_REAL timer for the process */ 409 struct hrtimer real_timer; 410 struct task_struct *tsk; 411 ktime_t it_real_incr; 412 413 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 414 cputime_t it_prof_expires, it_virt_expires; 415 cputime_t it_prof_incr, it_virt_incr; 416 417 /* job control IDs */ 418 pid_t pgrp; 419 pid_t tty_old_pgrp; 420 pid_t session; 421 /* boolean value for session group leader */ 422 int leader; 423 424 struct tty_struct *tty; /* NULL if no tty */ 425 426 /* 427 * Cumulative resource counters for dead threads in the group, 428 * and for reaped dead child processes forked by this group. 429 * Live threads maintain their own counters and add to these 430 * in __exit_signal, except for the group leader. 431 */ 432 cputime_t utime, stime, cutime, cstime; 433 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 434 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 435 436 /* 437 * Cumulative ns of scheduled CPU time for dead threads in the 438 * group, not including a zombie group leader. (This only differs 439 * from jiffies_to_ns(utime + stime) if sched_clock uses something 440 * other than jiffies.) 441 */ 442 unsigned long long sched_time; 443 444 /* 445 * We don't bother to synchronize most readers of this at all, 446 * because there is no reader checking a limit that actually needs 447 * to get both rlim_cur and rlim_max atomically, and either one 448 * alone is a single word that can safely be read normally. 449 * getrlimit/setrlimit use task_lock(current->group_leader) to 450 * protect this instead of the siglock, because they really 451 * have no need to disable irqs. 452 */ 453 struct rlimit rlim[RLIM_NLIMITS]; 454 455 struct list_head cpu_timers[3]; 456 457 /* keep the process-shared keyrings here so that they do the right 458 * thing in threads created with CLONE_THREAD */ 459#ifdef CONFIG_KEYS 460 struct key *session_keyring; /* keyring inherited over fork */ 461 struct key *process_keyring; /* keyring private to this process */ 462#endif 463#ifdef CONFIG_BSD_PROCESS_ACCT 464 struct pacct_struct pacct; /* per-process accounting information */ 465#endif 466#ifdef CONFIG_TASKSTATS 467 spinlock_t stats_lock; 468 struct taskstats *stats; 469#endif 470}; 471 472/* Context switch must be unlocked if interrupts are to be enabled */ 473#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 474# define __ARCH_WANT_UNLOCKED_CTXSW 475#endif 476 477/* 478 * Bits in flags field of signal_struct. 479 */ 480#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 481#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 482#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 483#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 484 485 486/* 487 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 488 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 489 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 490 * values are inverted: lower p->prio value means higher priority. 491 * 492 * The MAX_USER_RT_PRIO value allows the actual maximum 493 * RT priority to be separate from the value exported to 494 * user-space. This allows kernel threads to set their 495 * priority to a value higher than any user task. Note: 496 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 497 */ 498 499#define MAX_USER_RT_PRIO 100 500#define MAX_RT_PRIO MAX_USER_RT_PRIO 501 502#define MAX_PRIO (MAX_RT_PRIO + 40) 503 504#define rt_prio(prio) unlikely((prio) < MAX_RT_PRIO) 505#define rt_task(p) rt_prio((p)->prio) 506#define batch_task(p) (unlikely((p)->policy == SCHED_BATCH)) 507#define has_rt_policy(p) \ 508 unlikely((p)->policy != SCHED_NORMAL && (p)->policy != SCHED_BATCH) 509 510/* 511 * Some day this will be a full-fledged user tracking system.. 512 */ 513struct user_struct { 514 atomic_t __count; /* reference count */ 515 atomic_t processes; /* How many processes does this user have? */ 516 atomic_t files; /* How many open files does this user have? */ 517 atomic_t sigpending; /* How many pending signals does this user have? */ 518#ifdef CONFIG_INOTIFY_USER 519 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 520 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 521#endif 522 /* protected by mq_lock */ 523 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 524 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 525 526#ifdef CONFIG_KEYS 527 struct key *uid_keyring; /* UID specific keyring */ 528 struct key *session_keyring; /* UID's default session keyring */ 529#endif 530 531 /* Hash table maintenance information */ 532 struct list_head uidhash_list; 533 uid_t uid; 534}; 535 536extern struct user_struct *find_user(uid_t); 537 538extern struct user_struct root_user; 539#define INIT_USER (&root_user) 540 541struct backing_dev_info; 542struct reclaim_state; 543 544#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 545struct sched_info { 546 /* cumulative counters */ 547 unsigned long cpu_time, /* time spent on the cpu */ 548 run_delay, /* time spent waiting on a runqueue */ 549 pcnt; /* # of timeslices run on this cpu */ 550 551 /* timestamps */ 552 unsigned long last_arrival, /* when we last ran on a cpu */ 553 last_queued; /* when we were last queued to run */ 554}; 555#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 556 557#ifdef CONFIG_SCHEDSTATS 558extern struct file_operations proc_schedstat_operations; 559#endif /* CONFIG_SCHEDSTATS */ 560 561#ifdef CONFIG_TASK_DELAY_ACCT 562struct task_delay_info { 563 spinlock_t lock; 564 unsigned int flags; /* Private per-task flags */ 565 566 /* For each stat XXX, add following, aligned appropriately 567 * 568 * struct timespec XXX_start, XXX_end; 569 * u64 XXX_delay; 570 * u32 XXX_count; 571 * 572 * Atomicity of updates to XXX_delay, XXX_count protected by 573 * single lock above (split into XXX_lock if contention is an issue). 574 */ 575 576 /* 577 * XXX_count is incremented on every XXX operation, the delay 578 * associated with the operation is added to XXX_delay. 579 * XXX_delay contains the accumulated delay time in nanoseconds. 580 */ 581 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 582 u64 blkio_delay; /* wait for sync block io completion */ 583 u64 swapin_delay; /* wait for swapin block io completion */ 584 u32 blkio_count; /* total count of the number of sync block */ 585 /* io operations performed */ 586 u32 swapin_count; /* total count of the number of swapin block */ 587 /* io operations performed */ 588}; 589#endif /* CONFIG_TASK_DELAY_ACCT */ 590 591static inline int sched_info_on(void) 592{ 593#ifdef CONFIG_SCHEDSTATS 594 return 1; 595#elif defined(CONFIG_TASK_DELAY_ACCT) 596 extern int delayacct_on; 597 return delayacct_on; 598#else 599 return 0; 600#endif 601} 602 603enum idle_type 604{ 605 SCHED_IDLE, 606 NOT_IDLE, 607 NEWLY_IDLE, 608 MAX_IDLE_TYPES 609}; 610 611/* 612 * sched-domains (multiprocessor balancing) declarations: 613 */ 614#define SCHED_LOAD_SCALE 128UL /* increase resolution of load */ 615 616#ifdef CONFIG_SMP 617#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 618#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 619#define SD_BALANCE_EXEC 4 /* Balance on exec */ 620#define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 621#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 622#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 623#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 624#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 625#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ 626 627#define BALANCE_FOR_POWER ((sched_mc_power_savings || sched_smt_power_savings) \ 628 ? SD_POWERSAVINGS_BALANCE : 0) 629 630 631struct sched_group { 632 struct sched_group *next; /* Must be a circular list */ 633 cpumask_t cpumask; 634 635 /* 636 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 637 * single CPU. This is read only (except for setup, hotplug CPU). 638 */ 639 unsigned long cpu_power; 640}; 641 642struct sched_domain { 643 /* These fields must be setup */ 644 struct sched_domain *parent; /* top domain must be null terminated */ 645 struct sched_group *groups; /* the balancing groups of the domain */ 646 cpumask_t span; /* span of all CPUs in this domain */ 647 unsigned long min_interval; /* Minimum balance interval ms */ 648 unsigned long max_interval; /* Maximum balance interval ms */ 649 unsigned int busy_factor; /* less balancing by factor if busy */ 650 unsigned int imbalance_pct; /* No balance until over watermark */ 651 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */ 652 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 653 unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */ 654 unsigned int busy_idx; 655 unsigned int idle_idx; 656 unsigned int newidle_idx; 657 unsigned int wake_idx; 658 unsigned int forkexec_idx; 659 int flags; /* See SD_* */ 660 661 /* Runtime fields. */ 662 unsigned long last_balance; /* init to jiffies. units in jiffies */ 663 unsigned int balance_interval; /* initialise to 1. units in ms. */ 664 unsigned int nr_balance_failed; /* initialise to 0 */ 665 666#ifdef CONFIG_SCHEDSTATS 667 /* load_balance() stats */ 668 unsigned long lb_cnt[MAX_IDLE_TYPES]; 669 unsigned long lb_failed[MAX_IDLE_TYPES]; 670 unsigned long lb_balanced[MAX_IDLE_TYPES]; 671 unsigned long lb_imbalance[MAX_IDLE_TYPES]; 672 unsigned long lb_gained[MAX_IDLE_TYPES]; 673 unsigned long lb_hot_gained[MAX_IDLE_TYPES]; 674 unsigned long lb_nobusyg[MAX_IDLE_TYPES]; 675 unsigned long lb_nobusyq[MAX_IDLE_TYPES]; 676 677 /* Active load balancing */ 678 unsigned long alb_cnt; 679 unsigned long alb_failed; 680 unsigned long alb_pushed; 681 682 /* SD_BALANCE_EXEC stats */ 683 unsigned long sbe_cnt; 684 unsigned long sbe_balanced; 685 unsigned long sbe_pushed; 686 687 /* SD_BALANCE_FORK stats */ 688 unsigned long sbf_cnt; 689 unsigned long sbf_balanced; 690 unsigned long sbf_pushed; 691 692 /* try_to_wake_up() stats */ 693 unsigned long ttwu_wake_remote; 694 unsigned long ttwu_move_affine; 695 unsigned long ttwu_move_balance; 696#endif 697}; 698 699extern int partition_sched_domains(cpumask_t *partition1, 700 cpumask_t *partition2); 701 702/* 703 * Maximum cache size the migration-costs auto-tuning code will 704 * search from: 705 */ 706extern unsigned int max_cache_size; 707 708#endif /* CONFIG_SMP */ 709 710 711struct io_context; /* See blkdev.h */ 712void exit_io_context(void); 713struct cpuset; 714 715#define NGROUPS_SMALL 32 716#define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) 717struct group_info { 718 int ngroups; 719 atomic_t usage; 720 gid_t small_block[NGROUPS_SMALL]; 721 int nblocks; 722 gid_t *blocks[0]; 723}; 724 725/* 726 * get_group_info() must be called with the owning task locked (via task_lock()) 727 * when task != current. The reason being that the vast majority of callers are 728 * looking at current->group_info, which can not be changed except by the 729 * current task. Changing current->group_info requires the task lock, too. 730 */ 731#define get_group_info(group_info) do { \ 732 atomic_inc(&(group_info)->usage); \ 733} while (0) 734 735#define put_group_info(group_info) do { \ 736 if (atomic_dec_and_test(&(group_info)->usage)) \ 737 groups_free(group_info); \ 738} while (0) 739 740extern struct group_info *groups_alloc(int gidsetsize); 741extern void groups_free(struct group_info *group_info); 742extern int set_current_groups(struct group_info *group_info); 743extern int groups_search(struct group_info *group_info, gid_t grp); 744/* access the groups "array" with this macro */ 745#define GROUP_AT(gi, i) \ 746 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) 747 748#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 749extern void prefetch_stack(struct task_struct *t); 750#else 751static inline void prefetch_stack(struct task_struct *t) { } 752#endif 753 754struct audit_context; /* See audit.c */ 755struct mempolicy; 756struct pipe_inode_info; 757 758enum sleep_type { 759 SLEEP_NORMAL, 760 SLEEP_NONINTERACTIVE, 761 SLEEP_INTERACTIVE, 762 SLEEP_INTERRUPTED, 763}; 764 765struct prio_array; 766 767struct task_struct { 768 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 769 struct thread_info *thread_info; 770 atomic_t usage; 771 unsigned long flags; /* per process flags, defined below */ 772 unsigned long ptrace; 773 774 int lock_depth; /* BKL lock depth */ 775 776#ifdef CONFIG_SMP 777#ifdef __ARCH_WANT_UNLOCKED_CTXSW 778 int oncpu; 779#endif 780#endif 781 int load_weight; /* for niceness load balancing purposes */ 782 int prio, static_prio, normal_prio; 783 struct list_head run_list; 784 struct prio_array *array; 785 786 unsigned short ioprio; 787 unsigned int btrace_seq; 788 789 unsigned long sleep_avg; 790 unsigned long long timestamp, last_ran; 791 unsigned long long sched_time; /* sched_clock time spent running */ 792 enum sleep_type sleep_type; 793 794 unsigned long policy; 795 cpumask_t cpus_allowed; 796 unsigned int time_slice, first_time_slice; 797 798#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 799 struct sched_info sched_info; 800#endif 801 802 struct list_head tasks; 803 /* 804 * ptrace_list/ptrace_children forms the list of my children 805 * that were stolen by a ptracer. 806 */ 807 struct list_head ptrace_children; 808 struct list_head ptrace_list; 809 810 struct mm_struct *mm, *active_mm; 811 812/* task state */ 813 struct linux_binfmt *binfmt; 814 long exit_state; 815 int exit_code, exit_signal; 816 int pdeath_signal; /* The signal sent when the parent dies */ 817 /* ??? */ 818 unsigned long personality; 819 unsigned did_exec:1; 820 pid_t pid; 821 pid_t tgid; 822 /* 823 * pointers to (original) parent process, youngest child, younger sibling, 824 * older sibling, respectively. (p->father can be replaced with 825 * p->parent->pid) 826 */ 827 struct task_struct *real_parent; /* real parent process (when being debugged) */ 828 struct task_struct *parent; /* parent process */ 829 /* 830 * children/sibling forms the list of my children plus the 831 * tasks I'm ptracing. 832 */ 833 struct list_head children; /* list of my children */ 834 struct list_head sibling; /* linkage in my parent's children list */ 835 struct task_struct *group_leader; /* threadgroup leader */ 836 837 /* PID/PID hash table linkage. */ 838 struct pid_link pids[PIDTYPE_MAX]; 839 struct list_head thread_group; 840 841 struct completion *vfork_done; /* for vfork() */ 842 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 843 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 844 845 unsigned long rt_priority; 846 cputime_t utime, stime; 847 unsigned long nvcsw, nivcsw; /* context switch counts */ 848 struct timespec start_time; 849/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 850 unsigned long min_flt, maj_flt; 851 852 cputime_t it_prof_expires, it_virt_expires; 853 unsigned long long it_sched_expires; 854 struct list_head cpu_timers[3]; 855 856/* process credentials */ 857 uid_t uid,euid,suid,fsuid; 858 gid_t gid,egid,sgid,fsgid; 859 struct group_info *group_info; 860 kernel_cap_t cap_effective, cap_inheritable, cap_permitted; 861 unsigned keep_capabilities:1; 862 struct user_struct *user; 863#ifdef CONFIG_KEYS 864 struct key *request_key_auth; /* assumed request_key authority */ 865 struct key *thread_keyring; /* keyring private to this thread */ 866 unsigned char jit_keyring; /* default keyring to attach requested keys to */ 867#endif 868 int oomkilladj; /* OOM kill score adjustment (bit shift). */ 869 char comm[TASK_COMM_LEN]; /* executable name excluding path 870 - access with [gs]et_task_comm (which lock 871 it with task_lock()) 872 - initialized normally by flush_old_exec */ 873/* file system info */ 874 int link_count, total_link_count; 875/* ipc stuff */ 876 struct sysv_sem sysvsem; 877/* CPU-specific state of this task */ 878 struct thread_struct thread; 879/* filesystem information */ 880 struct fs_struct *fs; 881/* open file information */ 882 struct files_struct *files; 883/* namespace */ 884 struct namespace *namespace; 885/* signal handlers */ 886 struct signal_struct *signal; 887 struct sighand_struct *sighand; 888 889 sigset_t blocked, real_blocked; 890 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */ 891 struct sigpending pending; 892 893 unsigned long sas_ss_sp; 894 size_t sas_ss_size; 895 int (*notifier)(void *priv); 896 void *notifier_data; 897 sigset_t *notifier_mask; 898 899 void *security; 900 struct audit_context *audit_context; 901 seccomp_t seccomp; 902 903/* Thread group tracking */ 904 u32 parent_exec_id; 905 u32 self_exec_id; 906/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 907 spinlock_t alloc_lock; 908 909 /* Protection of the PI data structures: */ 910 spinlock_t pi_lock; 911 912#ifdef CONFIG_RT_MUTEXES 913 /* PI waiters blocked on a rt_mutex held by this task */ 914 struct plist_head pi_waiters; 915 /* Deadlock detection and priority inheritance handling */ 916 struct rt_mutex_waiter *pi_blocked_on; 917#endif 918 919#ifdef CONFIG_DEBUG_MUTEXES 920 /* mutex deadlock detection */ 921 struct mutex_waiter *blocked_on; 922#endif 923#ifdef CONFIG_TRACE_IRQFLAGS 924 unsigned int irq_events; 925 int hardirqs_enabled; 926 unsigned long hardirq_enable_ip; 927 unsigned int hardirq_enable_event; 928 unsigned long hardirq_disable_ip; 929 unsigned int hardirq_disable_event; 930 int softirqs_enabled; 931 unsigned long softirq_disable_ip; 932 unsigned int softirq_disable_event; 933 unsigned long softirq_enable_ip; 934 unsigned int softirq_enable_event; 935 int hardirq_context; 936 int softirq_context; 937#endif 938#ifdef CONFIG_LOCKDEP 939# define MAX_LOCK_DEPTH 30UL 940 u64 curr_chain_key; 941 int lockdep_depth; 942 struct held_lock held_locks[MAX_LOCK_DEPTH]; 943 unsigned int lockdep_recursion; 944#endif 945 946/* journalling filesystem info */ 947 void *journal_info; 948 949/* VM state */ 950 struct reclaim_state *reclaim_state; 951 952 struct backing_dev_info *backing_dev_info; 953 954 struct io_context *io_context; 955 956 unsigned long ptrace_message; 957 siginfo_t *last_siginfo; /* For ptrace use. */ 958/* 959 * current io wait handle: wait queue entry to use for io waits 960 * If this thread is processing aio, this points at the waitqueue 961 * inside the currently handled kiocb. It may be NULL (i.e. default 962 * to a stack based synchronous wait) if its doing sync IO. 963 */ 964 wait_queue_t *io_wait; 965/* i/o counters(bytes read/written, #syscalls */ 966 u64 rchar, wchar, syscr, syscw; 967#if defined(CONFIG_BSD_PROCESS_ACCT) 968 u64 acct_rss_mem1; /* accumulated rss usage */ 969 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 970 clock_t acct_stimexpd; /* clock_t-converted stime since last update */ 971#endif 972#ifdef CONFIG_NUMA 973 struct mempolicy *mempolicy; 974 short il_next; 975#endif 976#ifdef CONFIG_CPUSETS 977 struct cpuset *cpuset; 978 nodemask_t mems_allowed; 979 int cpuset_mems_generation; 980 int cpuset_mem_spread_rotor; 981#endif 982 struct robust_list_head __user *robust_list; 983#ifdef CONFIG_COMPAT 984 struct compat_robust_list_head __user *compat_robust_list; 985#endif 986 struct list_head pi_state_list; 987 struct futex_pi_state *pi_state_cache; 988 989 atomic_t fs_excl; /* holding fs exclusive resources */ 990 struct rcu_head rcu; 991 992 /* 993 * cache last used pipe for splice 994 */ 995 struct pipe_inode_info *splice_pipe; 996#ifdef CONFIG_TASK_DELAY_ACCT 997 struct task_delay_info *delays; 998#endif 999}; 1000 1001static inline pid_t process_group(struct task_struct *tsk) 1002{ 1003 return tsk->signal->pgrp; 1004} 1005 1006/** 1007 * pid_alive - check that a task structure is not stale 1008 * @p: Task structure to be checked. 1009 * 1010 * Test if a process is not yet dead (at most zombie state) 1011 * If pid_alive fails, then pointers within the task structure 1012 * can be stale and must not be dereferenced. 1013 */ 1014static inline int pid_alive(struct task_struct *p) 1015{ 1016 return p->pids[PIDTYPE_PID].pid != NULL; 1017} 1018 1019extern void free_task(struct task_struct *tsk); 1020#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1021 1022extern void __put_task_struct(struct task_struct *t); 1023 1024static inline void put_task_struct(struct task_struct *t) 1025{ 1026 if (atomic_dec_and_test(&t->usage)) 1027 __put_task_struct(t); 1028} 1029 1030/* 1031 * Per process flags 1032 */ 1033#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 1034 /* Not implemented yet, only for 486*/ 1035#define PF_STARTING 0x00000002 /* being created */ 1036#define PF_EXITING 0x00000004 /* getting shut down */ 1037#define PF_DEAD 0x00000008 /* Dead */ 1038#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1039#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1040#define PF_DUMPCORE 0x00000200 /* dumped core */ 1041#define PF_SIGNALED 0x00000400 /* killed by a signal */ 1042#define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1043#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 1044#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1045#define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */ 1046#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1047#define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1048#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1049#define PF_KSWAPD 0x00040000 /* I am kswapd */ 1050#define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 1051#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1052#define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */ 1053#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1054#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1055#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1056#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1057#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1058#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1059 1060/* 1061 * Only the _current_ task can read/write to tsk->flags, but other 1062 * tasks can access tsk->flags in readonly mode for example 1063 * with tsk_used_math (like during threaded core dumping). 1064 * There is however an exception to this rule during ptrace 1065 * or during fork: the ptracer task is allowed to write to the 1066 * child->flags of its traced child (same goes for fork, the parent 1067 * can write to the child->flags), because we're guaranteed the 1068 * child is not running and in turn not changing child->flags 1069 * at the same time the parent does it. 1070 */ 1071#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1072#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1073#define clear_used_math() clear_stopped_child_used_math(current) 1074#define set_used_math() set_stopped_child_used_math(current) 1075#define conditional_stopped_child_used_math(condition, child) \ 1076 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1077#define conditional_used_math(condition) \ 1078 conditional_stopped_child_used_math(condition, current) 1079#define copy_to_stopped_child_used_math(child) \ 1080 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1081/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1082#define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1083#define used_math() tsk_used_math(current) 1084 1085#ifdef CONFIG_SMP 1086extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask); 1087#else 1088static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1089{ 1090 if (!cpu_isset(0, new_mask)) 1091 return -EINVAL; 1092 return 0; 1093} 1094#endif 1095 1096extern unsigned long long sched_clock(void); 1097extern unsigned long long 1098current_sched_time(const struct task_struct *current_task); 1099 1100/* sched_exec is called by processes performing an exec */ 1101#ifdef CONFIG_SMP 1102extern void sched_exec(void); 1103#else 1104#define sched_exec() {} 1105#endif 1106 1107#ifdef CONFIG_HOTPLUG_CPU 1108extern void idle_task_exit(void); 1109#else 1110static inline void idle_task_exit(void) {} 1111#endif 1112 1113extern void sched_idle_next(void); 1114 1115#ifdef CONFIG_RT_MUTEXES 1116extern int rt_mutex_getprio(struct task_struct *p); 1117extern void rt_mutex_setprio(struct task_struct *p, int prio); 1118extern void rt_mutex_adjust_pi(struct task_struct *p); 1119#else 1120static inline int rt_mutex_getprio(struct task_struct *p) 1121{ 1122 return p->normal_prio; 1123} 1124# define rt_mutex_adjust_pi(p) do { } while (0) 1125#endif 1126 1127extern void set_user_nice(struct task_struct *p, long nice); 1128extern int task_prio(const struct task_struct *p); 1129extern int task_nice(const struct task_struct *p); 1130extern int can_nice(const struct task_struct *p, const int nice); 1131extern int task_curr(const struct task_struct *p); 1132extern int idle_cpu(int cpu); 1133extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1134extern struct task_struct *idle_task(int cpu); 1135extern struct task_struct *curr_task(int cpu); 1136extern void set_curr_task(int cpu, struct task_struct *p); 1137 1138void yield(void); 1139 1140/* 1141 * The default (Linux) execution domain. 1142 */ 1143extern struct exec_domain default_exec_domain; 1144 1145union thread_union { 1146 struct thread_info thread_info; 1147 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1148}; 1149 1150#ifndef __HAVE_ARCH_KSTACK_END 1151static inline int kstack_end(void *addr) 1152{ 1153 /* Reliable end of stack detection: 1154 * Some APM bios versions misalign the stack 1155 */ 1156 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1157} 1158#endif 1159 1160extern union thread_union init_thread_union; 1161extern struct task_struct init_task; 1162 1163extern struct mm_struct init_mm; 1164 1165#define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr) 1166extern struct task_struct *find_task_by_pid_type(int type, int pid); 1167extern void set_special_pids(pid_t session, pid_t pgrp); 1168extern void __set_special_pids(pid_t session, pid_t pgrp); 1169 1170/* per-UID process charging. */ 1171extern struct user_struct * alloc_uid(uid_t); 1172static inline struct user_struct *get_uid(struct user_struct *u) 1173{ 1174 atomic_inc(&u->__count); 1175 return u; 1176} 1177extern void free_uid(struct user_struct *); 1178extern void switch_uid(struct user_struct *); 1179 1180#include <asm/current.h> 1181 1182extern void do_timer(struct pt_regs *); 1183 1184extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); 1185extern int FASTCALL(wake_up_process(struct task_struct * tsk)); 1186extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, 1187 unsigned long clone_flags)); 1188#ifdef CONFIG_SMP 1189 extern void kick_process(struct task_struct *tsk); 1190#else 1191 static inline void kick_process(struct task_struct *tsk) { } 1192#endif 1193extern void FASTCALL(sched_fork(struct task_struct * p, int clone_flags)); 1194extern void FASTCALL(sched_exit(struct task_struct * p)); 1195 1196extern int in_group_p(gid_t); 1197extern int in_egroup_p(gid_t); 1198 1199extern void proc_caches_init(void); 1200extern void flush_signals(struct task_struct *); 1201extern void flush_signal_handlers(struct task_struct *, int force_default); 1202extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 1203 1204static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 1205{ 1206 unsigned long flags; 1207 int ret; 1208 1209 spin_lock_irqsave(&tsk->sighand->siglock, flags); 1210 ret = dequeue_signal(tsk, mask, info); 1211 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 1212 1213 return ret; 1214} 1215 1216extern void block_all_signals(int (*notifier)(void *priv), void *priv, 1217 sigset_t *mask); 1218extern void unblock_all_signals(void); 1219extern void release_task(struct task_struct * p); 1220extern int send_sig_info(int, struct siginfo *, struct task_struct *); 1221extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); 1222extern int force_sigsegv(int, struct task_struct *); 1223extern int force_sig_info(int, struct siginfo *, struct task_struct *); 1224extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp); 1225extern int kill_pg_info(int, struct siginfo *, pid_t); 1226extern int kill_proc_info(int, struct siginfo *, pid_t); 1227extern int kill_proc_info_as_uid(int, struct siginfo *, pid_t, uid_t, uid_t, u32); 1228extern void do_notify_parent(struct task_struct *, int); 1229extern void force_sig(int, struct task_struct *); 1230extern void force_sig_specific(int, struct task_struct *); 1231extern int send_sig(int, struct task_struct *, int); 1232extern void zap_other_threads(struct task_struct *p); 1233extern int kill_pg(pid_t, int, int); 1234extern int kill_proc(pid_t, int, int); 1235extern struct sigqueue *sigqueue_alloc(void); 1236extern void sigqueue_free(struct sigqueue *); 1237extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); 1238extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); 1239extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 1240extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 1241 1242/* These can be the second arg to send_sig_info/send_group_sig_info. */ 1243#define SEND_SIG_NOINFO ((struct siginfo *) 0) 1244#define SEND_SIG_PRIV ((struct siginfo *) 1) 1245#define SEND_SIG_FORCED ((struct siginfo *) 2) 1246 1247static inline int is_si_special(const struct siginfo *info) 1248{ 1249 return info <= SEND_SIG_FORCED; 1250} 1251 1252/* True if we are on the alternate signal stack. */ 1253 1254static inline int on_sig_stack(unsigned long sp) 1255{ 1256 return (sp - current->sas_ss_sp < current->sas_ss_size); 1257} 1258 1259static inline int sas_ss_flags(unsigned long sp) 1260{ 1261 return (current->sas_ss_size == 0 ? SS_DISABLE 1262 : on_sig_stack(sp) ? SS_ONSTACK : 0); 1263} 1264 1265/* 1266 * Routines for handling mm_structs 1267 */ 1268extern struct mm_struct * mm_alloc(void); 1269 1270/* mmdrop drops the mm and the page tables */ 1271extern void FASTCALL(__mmdrop(struct mm_struct *)); 1272static inline void mmdrop(struct mm_struct * mm) 1273{ 1274 if (atomic_dec_and_test(&mm->mm_count)) 1275 __mmdrop(mm); 1276} 1277 1278/* mmput gets rid of the mappings and all user-space */ 1279extern void mmput(struct mm_struct *); 1280/* Grab a reference to a task's mm, if it is not already going away */ 1281extern struct mm_struct *get_task_mm(struct task_struct *task); 1282/* Remove the current tasks stale references to the old mm_struct */ 1283extern void mm_release(struct task_struct *, struct mm_struct *); 1284 1285extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 1286extern void flush_thread(void); 1287extern void exit_thread(void); 1288 1289extern void exit_files(struct task_struct *); 1290extern void __cleanup_signal(struct signal_struct *); 1291extern void __cleanup_sighand(struct sighand_struct *); 1292extern void exit_itimers(struct signal_struct *); 1293 1294extern NORET_TYPE void do_group_exit(int); 1295 1296extern void daemonize(const char *, ...); 1297extern int allow_signal(int); 1298extern int disallow_signal(int); 1299extern struct task_struct *child_reaper; 1300 1301extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 1302extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 1303struct task_struct *fork_idle(int); 1304 1305extern void set_task_comm(struct task_struct *tsk, char *from); 1306extern void get_task_comm(char *to, struct task_struct *tsk); 1307 1308#ifdef CONFIG_SMP 1309extern void wait_task_inactive(struct task_struct * p); 1310#else 1311#define wait_task_inactive(p) do { } while (0) 1312#endif 1313 1314#define remove_parent(p) list_del_init(&(p)->sibling) 1315#define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children) 1316 1317#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) 1318 1319#define for_each_process(p) \ 1320 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 1321 1322/* 1323 * Careful: do_each_thread/while_each_thread is a double loop so 1324 * 'break' will not work as expected - use goto instead. 1325 */ 1326#define do_each_thread(g, t) \ 1327 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 1328 1329#define while_each_thread(g, t) \ 1330 while ((t = next_thread(t)) != g) 1331 1332/* de_thread depends on thread_group_leader not being a pid based check */ 1333#define thread_group_leader(p) (p == p->group_leader) 1334 1335static inline struct task_struct *next_thread(const struct task_struct *p) 1336{ 1337 return list_entry(rcu_dereference(p->thread_group.next), 1338 struct task_struct, thread_group); 1339} 1340 1341static inline int thread_group_empty(struct task_struct *p) 1342{ 1343 return list_empty(&p->thread_group); 1344} 1345 1346#define delay_group_leader(p) \ 1347 (thread_group_leader(p) && !thread_group_empty(p)) 1348 1349/* 1350 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 1351 * subscriptions and synchronises with wait4(). Also used in procfs. Also 1352 * pins the final release of task.io_context. Also protects ->cpuset. 1353 * 1354 * Nests both inside and outside of read_lock(&tasklist_lock). 1355 * It must not be nested with write_lock_irq(&tasklist_lock), 1356 * neither inside nor outside. 1357 */ 1358static inline void task_lock(struct task_struct *p) 1359{ 1360 spin_lock(&p->alloc_lock); 1361} 1362 1363static inline void task_unlock(struct task_struct *p) 1364{ 1365 spin_unlock(&p->alloc_lock); 1366} 1367 1368extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 1369 unsigned long *flags); 1370 1371static inline void unlock_task_sighand(struct task_struct *tsk, 1372 unsigned long *flags) 1373{ 1374 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 1375} 1376 1377#ifndef __HAVE_THREAD_FUNCTIONS 1378 1379#define task_thread_info(task) (task)->thread_info 1380#define task_stack_page(task) ((void*)((task)->thread_info)) 1381 1382static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 1383{ 1384 *task_thread_info(p) = *task_thread_info(org); 1385 task_thread_info(p)->task = p; 1386} 1387 1388static inline unsigned long *end_of_stack(struct task_struct *p) 1389{ 1390 return (unsigned long *)(p->thread_info + 1); 1391} 1392 1393#endif 1394 1395/* set thread flags in other task's structures 1396 * - see asm/thread_info.h for TIF_xxxx flags available 1397 */ 1398static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 1399{ 1400 set_ti_thread_flag(task_thread_info(tsk), flag); 1401} 1402 1403static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1404{ 1405 clear_ti_thread_flag(task_thread_info(tsk), flag); 1406} 1407 1408static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 1409{ 1410 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 1411} 1412 1413static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1414{ 1415 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 1416} 1417 1418static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 1419{ 1420 return test_ti_thread_flag(task_thread_info(tsk), flag); 1421} 1422 1423static inline void set_tsk_need_resched(struct task_struct *tsk) 1424{ 1425 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1426} 1427 1428static inline void clear_tsk_need_resched(struct task_struct *tsk) 1429{ 1430 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1431} 1432 1433static inline int signal_pending(struct task_struct *p) 1434{ 1435 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 1436} 1437 1438static inline int need_resched(void) 1439{ 1440 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 1441} 1442 1443/* 1444 * cond_resched() and cond_resched_lock(): latency reduction via 1445 * explicit rescheduling in places that are safe. The return 1446 * value indicates whether a reschedule was done in fact. 1447 * cond_resched_lock() will drop the spinlock before scheduling, 1448 * cond_resched_softirq() will enable bhs before scheduling. 1449 */ 1450extern int cond_resched(void); 1451extern int cond_resched_lock(spinlock_t * lock); 1452extern int cond_resched_softirq(void); 1453 1454/* 1455 * Does a critical section need to be broken due to another 1456 * task waiting?: 1457 */ 1458#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) 1459# define need_lockbreak(lock) ((lock)->break_lock) 1460#else 1461# define need_lockbreak(lock) 0 1462#endif 1463 1464/* 1465 * Does a critical section need to be broken due to another 1466 * task waiting or preemption being signalled: 1467 */ 1468static inline int lock_need_resched(spinlock_t *lock) 1469{ 1470 if (need_lockbreak(lock) || need_resched()) 1471 return 1; 1472 return 0; 1473} 1474 1475/* Reevaluate whether the task has signals pending delivery. 1476 This is required every time the blocked sigset_t changes. 1477 callers must hold sighand->siglock. */ 1478 1479extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t)); 1480extern void recalc_sigpending(void); 1481 1482extern void signal_wake_up(struct task_struct *t, int resume_stopped); 1483 1484/* 1485 * Wrappers for p->thread_info->cpu access. No-op on UP. 1486 */ 1487#ifdef CONFIG_SMP 1488 1489static inline unsigned int task_cpu(const struct task_struct *p) 1490{ 1491 return task_thread_info(p)->cpu; 1492} 1493 1494static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 1495{ 1496 task_thread_info(p)->cpu = cpu; 1497} 1498 1499#else 1500 1501static inline unsigned int task_cpu(const struct task_struct *p) 1502{ 1503 return 0; 1504} 1505 1506static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 1507{ 1508} 1509 1510#endif /* CONFIG_SMP */ 1511 1512#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1513extern void arch_pick_mmap_layout(struct mm_struct *mm); 1514#else 1515static inline void arch_pick_mmap_layout(struct mm_struct *mm) 1516{ 1517 mm->mmap_base = TASK_UNMAPPED_BASE; 1518 mm->get_unmapped_area = arch_get_unmapped_area; 1519 mm->unmap_area = arch_unmap_area; 1520} 1521#endif 1522 1523extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); 1524extern long sched_getaffinity(pid_t pid, cpumask_t *mask); 1525 1526#include <linux/sysdev.h> 1527extern int sched_mc_power_savings, sched_smt_power_savings; 1528extern struct sysdev_attribute attr_sched_mc_power_savings, attr_sched_smt_power_savings; 1529extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls); 1530 1531extern void normalize_rt_tasks(void); 1532 1533#ifdef CONFIG_PM 1534/* 1535 * Check if a process has been frozen 1536 */ 1537static inline int frozen(struct task_struct *p) 1538{ 1539 return p->flags & PF_FROZEN; 1540} 1541 1542/* 1543 * Check if there is a request to freeze a process 1544 */ 1545static inline int freezing(struct task_struct *p) 1546{ 1547 return p->flags & PF_FREEZE; 1548} 1549 1550/* 1551 * Request that a process be frozen 1552 * FIXME: SMP problem. We may not modify other process' flags! 1553 */ 1554static inline void freeze(struct task_struct *p) 1555{ 1556 p->flags |= PF_FREEZE; 1557} 1558 1559/* 1560 * Sometimes we may need to cancel the previous 'freeze' request 1561 */ 1562static inline void do_not_freeze(struct task_struct *p) 1563{ 1564 p->flags &= ~PF_FREEZE; 1565} 1566 1567/* 1568 * Wake up a frozen process 1569 */ 1570static inline int thaw_process(struct task_struct *p) 1571{ 1572 if (frozen(p)) { 1573 p->flags &= ~PF_FROZEN; 1574 wake_up_process(p); 1575 return 1; 1576 } 1577 return 0; 1578} 1579 1580/* 1581 * freezing is complete, mark process as frozen 1582 */ 1583static inline void frozen_process(struct task_struct *p) 1584{ 1585 p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN; 1586} 1587 1588extern void refrigerator(void); 1589extern int freeze_processes(void); 1590extern void thaw_processes(void); 1591 1592static inline int try_to_freeze(void) 1593{ 1594 if (freezing(current)) { 1595 refrigerator(); 1596 return 1; 1597 } else 1598 return 0; 1599} 1600#else 1601static inline int frozen(struct task_struct *p) { return 0; } 1602static inline int freezing(struct task_struct *p) { return 0; } 1603static inline void freeze(struct task_struct *p) { BUG(); } 1604static inline int thaw_process(struct task_struct *p) { return 1; } 1605static inline void frozen_process(struct task_struct *p) { BUG(); } 1606 1607static inline void refrigerator(void) {} 1608static inline int freeze_processes(void) { BUG(); return 0; } 1609static inline void thaw_processes(void) {} 1610 1611static inline int try_to_freeze(void) { return 0; } 1612 1613#endif /* CONFIG_PM */ 1614#endif /* __KERNEL__ */ 1615 1616#endif 1617