sched.h revision 383f2835eb9afb723af71850037b2f074ac9db60
1#ifndef _LINUX_SCHED_H 2#define _LINUX_SCHED_H 3 4#include <asm/param.h> /* for HZ */ 5 6#include <linux/config.h> 7#include <linux/capability.h> 8#include <linux/threads.h> 9#include <linux/kernel.h> 10#include <linux/types.h> 11#include <linux/timex.h> 12#include <linux/jiffies.h> 13#include <linux/rbtree.h> 14#include <linux/thread_info.h> 15#include <linux/cpumask.h> 16#include <linux/errno.h> 17#include <linux/nodemask.h> 18 19#include <asm/system.h> 20#include <asm/semaphore.h> 21#include <asm/page.h> 22#include <asm/ptrace.h> 23#include <asm/mmu.h> 24#include <asm/cputime.h> 25 26#include <linux/smp.h> 27#include <linux/sem.h> 28#include <linux/signal.h> 29#include <linux/securebits.h> 30#include <linux/fs_struct.h> 31#include <linux/compiler.h> 32#include <linux/completion.h> 33#include <linux/pid.h> 34#include <linux/percpu.h> 35#include <linux/topology.h> 36#include <linux/seccomp.h> 37 38#include <linux/auxvec.h> /* For AT_VECTOR_SIZE */ 39 40struct exec_domain; 41 42/* 43 * cloning flags: 44 */ 45#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ 46#define CLONE_VM 0x00000100 /* set if VM shared between processes */ 47#define CLONE_FS 0x00000200 /* set if fs info shared between processes */ 48#define CLONE_FILES 0x00000400 /* set if open files shared between processes */ 49#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ 50#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ 51#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ 52#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ 53#define CLONE_THREAD 0x00010000 /* Same thread group? */ 54#define CLONE_NEWNS 0x00020000 /* New namespace group? */ 55#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ 56#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ 57#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ 58#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ 59#define CLONE_DETACHED 0x00400000 /* Unused, ignored */ 60#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ 61#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ 62#define CLONE_STOPPED 0x02000000 /* Start in stopped state */ 63 64/* 65 * List of flags we want to share for kernel threads, 66 * if only because they are not used by them anyway. 67 */ 68#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 69 70/* 71 * These are the constant used to fake the fixed-point load-average 72 * counting. Some notes: 73 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 74 * a load-average precision of 10 bits integer + 11 bits fractional 75 * - if you want to count load-averages more often, you need more 76 * precision, or rounding will get you. With 2-second counting freq, 77 * the EXP_n values would be 1981, 2034 and 2043 if still using only 78 * 11 bit fractions. 79 */ 80extern unsigned long avenrun[]; /* Load averages */ 81 82#define FSHIFT 11 /* nr of bits of precision */ 83#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 84#define LOAD_FREQ (5*HZ) /* 5 sec intervals */ 85#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 86#define EXP_5 2014 /* 1/exp(5sec/5min) */ 87#define EXP_15 2037 /* 1/exp(5sec/15min) */ 88 89#define CALC_LOAD(load,exp,n) \ 90 load *= exp; \ 91 load += n*(FIXED_1-exp); \ 92 load >>= FSHIFT; 93 94extern unsigned long total_forks; 95extern int nr_threads; 96extern int last_pid; 97DECLARE_PER_CPU(unsigned long, process_counts); 98extern int nr_processes(void); 99extern unsigned long nr_running(void); 100extern unsigned long nr_uninterruptible(void); 101extern unsigned long nr_iowait(void); 102 103#include <linux/time.h> 104#include <linux/param.h> 105#include <linux/resource.h> 106#include <linux/timer.h> 107 108#include <asm/processor.h> 109 110#define TASK_RUNNING 0 111#define TASK_INTERRUPTIBLE 1 112#define TASK_UNINTERRUPTIBLE 2 113#define TASK_STOPPED 4 114#define TASK_TRACED 8 115#define EXIT_ZOMBIE 16 116#define EXIT_DEAD 32 117 118#define __set_task_state(tsk, state_value) \ 119 do { (tsk)->state = (state_value); } while (0) 120#define set_task_state(tsk, state_value) \ 121 set_mb((tsk)->state, (state_value)) 122 123#define __set_current_state(state_value) \ 124 do { current->state = (state_value); } while (0) 125#define set_current_state(state_value) \ 126 set_mb(current->state, (state_value)) 127 128/* Task command name length */ 129#define TASK_COMM_LEN 16 130 131/* 132 * Scheduling policies 133 */ 134#define SCHED_NORMAL 0 135#define SCHED_FIFO 1 136#define SCHED_RR 2 137 138struct sched_param { 139 int sched_priority; 140}; 141 142#ifdef __KERNEL__ 143 144#include <linux/spinlock.h> 145 146/* 147 * This serializes "schedule()" and also protects 148 * the run-queue from deletions/modifications (but 149 * _adding_ to the beginning of the run-queue has 150 * a separate lock). 151 */ 152extern rwlock_t tasklist_lock; 153extern spinlock_t mmlist_lock; 154 155typedef struct task_struct task_t; 156 157extern void sched_init(void); 158extern void sched_init_smp(void); 159extern void init_idle(task_t *idle, int cpu); 160 161extern cpumask_t nohz_cpu_mask; 162 163extern void show_state(void); 164extern void show_regs(struct pt_regs *); 165 166/* 167 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 168 * task), SP is the stack pointer of the first frame that should be shown in the back 169 * trace (or NULL if the entire call-chain of the task should be shown). 170 */ 171extern void show_stack(struct task_struct *task, unsigned long *sp); 172 173void io_schedule(void); 174long io_schedule_timeout(long timeout); 175 176extern void cpu_init (void); 177extern void trap_init(void); 178extern void update_process_times(int user); 179extern void scheduler_tick(void); 180 181#ifdef CONFIG_DETECT_SOFTLOCKUP 182extern void softlockup_tick(struct pt_regs *regs); 183extern void spawn_softlockup_task(void); 184extern void touch_softlockup_watchdog(void); 185#else 186static inline void softlockup_tick(struct pt_regs *regs) 187{ 188} 189static inline void spawn_softlockup_task(void) 190{ 191} 192static inline void touch_softlockup_watchdog(void) 193{ 194} 195#endif 196 197 198/* Attach to any functions which should be ignored in wchan output. */ 199#define __sched __attribute__((__section__(".sched.text"))) 200/* Is this address in the __sched functions? */ 201extern int in_sched_functions(unsigned long addr); 202 203#define MAX_SCHEDULE_TIMEOUT LONG_MAX 204extern signed long FASTCALL(schedule_timeout(signed long timeout)); 205asmlinkage void schedule(void); 206 207struct namespace; 208 209/* Maximum number of active map areas.. This is a random (large) number */ 210#define DEFAULT_MAX_MAP_COUNT 65536 211 212extern int sysctl_max_map_count; 213 214#include <linux/aio.h> 215 216extern unsigned long 217arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 218 unsigned long, unsigned long); 219extern unsigned long 220arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 221 unsigned long len, unsigned long pgoff, 222 unsigned long flags); 223extern void arch_unmap_area(struct mm_struct *, unsigned long); 224extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 225 226#define set_mm_counter(mm, member, value) (mm)->_##member = (value) 227#define get_mm_counter(mm, member) ((mm)->_##member) 228#define add_mm_counter(mm, member, value) (mm)->_##member += (value) 229#define inc_mm_counter(mm, member) (mm)->_##member++ 230#define dec_mm_counter(mm, member) (mm)->_##member-- 231typedef unsigned long mm_counter_t; 232 233struct mm_struct { 234 struct vm_area_struct * mmap; /* list of VMAs */ 235 struct rb_root mm_rb; 236 struct vm_area_struct * mmap_cache; /* last find_vma result */ 237 unsigned long (*get_unmapped_area) (struct file *filp, 238 unsigned long addr, unsigned long len, 239 unsigned long pgoff, unsigned long flags); 240 void (*unmap_area) (struct mm_struct *mm, unsigned long addr); 241 unsigned long mmap_base; /* base of mmap area */ 242 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ 243 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ 244 pgd_t * pgd; 245 atomic_t mm_users; /* How many users with user space? */ 246 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ 247 int map_count; /* number of VMAs */ 248 struct rw_semaphore mmap_sem; 249 spinlock_t page_table_lock; /* Protects page tables and some counters */ 250 251 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung 252 * together off init_mm.mmlist, and are protected 253 * by mmlist_lock 254 */ 255 256 unsigned long start_code, end_code, start_data, end_data; 257 unsigned long start_brk, brk, start_stack; 258 unsigned long arg_start, arg_end, env_start, env_end; 259 unsigned long total_vm, locked_vm, shared_vm; 260 unsigned long exec_vm, stack_vm, reserved_vm, def_flags, nr_ptes; 261 262 /* Special counters protected by the page_table_lock */ 263 mm_counter_t _rss; 264 mm_counter_t _anon_rss; 265 266 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ 267 268 unsigned dumpable:2; 269 cpumask_t cpu_vm_mask; 270 271 /* Architecture-specific MM context */ 272 mm_context_t context; 273 274 /* Token based thrashing protection. */ 275 unsigned long swap_token_time; 276 char recent_pagein; 277 278 /* coredumping support */ 279 int core_waiters; 280 struct completion *core_startup_done, core_done; 281 282 /* aio bits */ 283 rwlock_t ioctx_list_lock; 284 struct kioctx *ioctx_list; 285 286 struct kioctx default_kioctx; 287 288 unsigned long hiwater_rss; /* High-water RSS usage */ 289 unsigned long hiwater_vm; /* High-water virtual memory usage */ 290}; 291 292struct sighand_struct { 293 atomic_t count; 294 struct k_sigaction action[_NSIG]; 295 spinlock_t siglock; 296}; 297 298/* 299 * NOTE! "signal_struct" does not have it's own 300 * locking, because a shared signal_struct always 301 * implies a shared sighand_struct, so locking 302 * sighand_struct is always a proper superset of 303 * the locking of signal_struct. 304 */ 305struct signal_struct { 306 atomic_t count; 307 atomic_t live; 308 309 wait_queue_head_t wait_chldexit; /* for wait4() */ 310 311 /* current thread group signal load-balancing target: */ 312 task_t *curr_target; 313 314 /* shared signal handling: */ 315 struct sigpending shared_pending; 316 317 /* thread group exit support */ 318 int group_exit_code; 319 /* overloaded: 320 * - notify group_exit_task when ->count is equal to notify_count 321 * - everyone except group_exit_task is stopped during signal delivery 322 * of fatal signals, group_exit_task processes the signal. 323 */ 324 struct task_struct *group_exit_task; 325 int notify_count; 326 327 /* thread group stop support, overloads group_exit_code too */ 328 int group_stop_count; 329 unsigned int flags; /* see SIGNAL_* flags below */ 330 331 /* POSIX.1b Interval Timers */ 332 struct list_head posix_timers; 333 334 /* ITIMER_REAL timer for the process */ 335 struct timer_list real_timer; 336 unsigned long it_real_value, it_real_incr; 337 338 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 339 cputime_t it_prof_expires, it_virt_expires; 340 cputime_t it_prof_incr, it_virt_incr; 341 342 /* job control IDs */ 343 pid_t pgrp; 344 pid_t tty_old_pgrp; 345 pid_t session; 346 /* boolean value for session group leader */ 347 int leader; 348 349 struct tty_struct *tty; /* NULL if no tty */ 350 351 /* 352 * Cumulative resource counters for dead threads in the group, 353 * and for reaped dead child processes forked by this group. 354 * Live threads maintain their own counters and add to these 355 * in __exit_signal, except for the group leader. 356 */ 357 cputime_t utime, stime, cutime, cstime; 358 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 359 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 360 361 /* 362 * Cumulative ns of scheduled CPU time for dead threads in the 363 * group, not including a zombie group leader. (This only differs 364 * from jiffies_to_ns(utime + stime) if sched_clock uses something 365 * other than jiffies.) 366 */ 367 unsigned long long sched_time; 368 369 /* 370 * We don't bother to synchronize most readers of this at all, 371 * because there is no reader checking a limit that actually needs 372 * to get both rlim_cur and rlim_max atomically, and either one 373 * alone is a single word that can safely be read normally. 374 * getrlimit/setrlimit use task_lock(current->group_leader) to 375 * protect this instead of the siglock, because they really 376 * have no need to disable irqs. 377 */ 378 struct rlimit rlim[RLIM_NLIMITS]; 379 380 struct list_head cpu_timers[3]; 381 382 /* keep the process-shared keyrings here so that they do the right 383 * thing in threads created with CLONE_THREAD */ 384#ifdef CONFIG_KEYS 385 struct key *session_keyring; /* keyring inherited over fork */ 386 struct key *process_keyring; /* keyring private to this process */ 387#endif 388}; 389 390/* Context switch must be unlocked if interrupts are to be enabled */ 391#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 392# define __ARCH_WANT_UNLOCKED_CTXSW 393#endif 394 395/* 396 * Bits in flags field of signal_struct. 397 */ 398#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 399#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 400#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 401#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 402 403 404/* 405 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 406 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are 407 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values 408 * are inverted: lower p->prio value means higher priority. 409 * 410 * The MAX_USER_RT_PRIO value allows the actual maximum 411 * RT priority to be separate from the value exported to 412 * user-space. This allows kernel threads to set their 413 * priority to a value higher than any user task. Note: 414 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 415 */ 416 417#define MAX_USER_RT_PRIO 100 418#define MAX_RT_PRIO MAX_USER_RT_PRIO 419 420#define MAX_PRIO (MAX_RT_PRIO + 40) 421 422#define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO)) 423 424/* 425 * Some day this will be a full-fledged user tracking system.. 426 */ 427struct user_struct { 428 atomic_t __count; /* reference count */ 429 atomic_t processes; /* How many processes does this user have? */ 430 atomic_t files; /* How many open files does this user have? */ 431 atomic_t sigpending; /* How many pending signals does this user have? */ 432#ifdef CONFIG_INOTIFY 433 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 434 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 435#endif 436 /* protected by mq_lock */ 437 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 438 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 439 440#ifdef CONFIG_KEYS 441 struct key *uid_keyring; /* UID specific keyring */ 442 struct key *session_keyring; /* UID's default session keyring */ 443#endif 444 445 /* Hash table maintenance information */ 446 struct list_head uidhash_list; 447 uid_t uid; 448}; 449 450extern struct user_struct *find_user(uid_t); 451 452extern struct user_struct root_user; 453#define INIT_USER (&root_user) 454 455typedef struct prio_array prio_array_t; 456struct backing_dev_info; 457struct reclaim_state; 458 459#ifdef CONFIG_SCHEDSTATS 460struct sched_info { 461 /* cumulative counters */ 462 unsigned long cpu_time, /* time spent on the cpu */ 463 run_delay, /* time spent waiting on a runqueue */ 464 pcnt; /* # of timeslices run on this cpu */ 465 466 /* timestamps */ 467 unsigned long last_arrival, /* when we last ran on a cpu */ 468 last_queued; /* when we were last queued to run */ 469}; 470 471extern struct file_operations proc_schedstat_operations; 472#endif 473 474enum idle_type 475{ 476 SCHED_IDLE, 477 NOT_IDLE, 478 NEWLY_IDLE, 479 MAX_IDLE_TYPES 480}; 481 482/* 483 * sched-domains (multiprocessor balancing) declarations: 484 */ 485#ifdef CONFIG_SMP 486#define SCHED_LOAD_SCALE 128UL /* increase resolution of load */ 487 488#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 489#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 490#define SD_BALANCE_EXEC 4 /* Balance on exec */ 491#define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 492#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 493#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 494#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 495#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 496 497struct sched_group { 498 struct sched_group *next; /* Must be a circular list */ 499 cpumask_t cpumask; 500 501 /* 502 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 503 * single CPU. This is read only (except for setup, hotplug CPU). 504 */ 505 unsigned long cpu_power; 506}; 507 508struct sched_domain { 509 /* These fields must be setup */ 510 struct sched_domain *parent; /* top domain must be null terminated */ 511 struct sched_group *groups; /* the balancing groups of the domain */ 512 cpumask_t span; /* span of all CPUs in this domain */ 513 unsigned long min_interval; /* Minimum balance interval ms */ 514 unsigned long max_interval; /* Maximum balance interval ms */ 515 unsigned int busy_factor; /* less balancing by factor if busy */ 516 unsigned int imbalance_pct; /* No balance until over watermark */ 517 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */ 518 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 519 unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */ 520 unsigned int busy_idx; 521 unsigned int idle_idx; 522 unsigned int newidle_idx; 523 unsigned int wake_idx; 524 unsigned int forkexec_idx; 525 int flags; /* See SD_* */ 526 527 /* Runtime fields. */ 528 unsigned long last_balance; /* init to jiffies. units in jiffies */ 529 unsigned int balance_interval; /* initialise to 1. units in ms. */ 530 unsigned int nr_balance_failed; /* initialise to 0 */ 531 532#ifdef CONFIG_SCHEDSTATS 533 /* load_balance() stats */ 534 unsigned long lb_cnt[MAX_IDLE_TYPES]; 535 unsigned long lb_failed[MAX_IDLE_TYPES]; 536 unsigned long lb_balanced[MAX_IDLE_TYPES]; 537 unsigned long lb_imbalance[MAX_IDLE_TYPES]; 538 unsigned long lb_gained[MAX_IDLE_TYPES]; 539 unsigned long lb_hot_gained[MAX_IDLE_TYPES]; 540 unsigned long lb_nobusyg[MAX_IDLE_TYPES]; 541 unsigned long lb_nobusyq[MAX_IDLE_TYPES]; 542 543 /* Active load balancing */ 544 unsigned long alb_cnt; 545 unsigned long alb_failed; 546 unsigned long alb_pushed; 547 548 /* SD_BALANCE_EXEC stats */ 549 unsigned long sbe_cnt; 550 unsigned long sbe_balanced; 551 unsigned long sbe_pushed; 552 553 /* SD_BALANCE_FORK stats */ 554 unsigned long sbf_cnt; 555 unsigned long sbf_balanced; 556 unsigned long sbf_pushed; 557 558 /* try_to_wake_up() stats */ 559 unsigned long ttwu_wake_remote; 560 unsigned long ttwu_move_affine; 561 unsigned long ttwu_move_balance; 562#endif 563}; 564 565extern void partition_sched_domains(cpumask_t *partition1, 566 cpumask_t *partition2); 567#endif /* CONFIG_SMP */ 568 569 570struct io_context; /* See blkdev.h */ 571void exit_io_context(void); 572struct cpuset; 573 574#define NGROUPS_SMALL 32 575#define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) 576struct group_info { 577 int ngroups; 578 atomic_t usage; 579 gid_t small_block[NGROUPS_SMALL]; 580 int nblocks; 581 gid_t *blocks[0]; 582}; 583 584/* 585 * get_group_info() must be called with the owning task locked (via task_lock()) 586 * when task != current. The reason being that the vast majority of callers are 587 * looking at current->group_info, which can not be changed except by the 588 * current task. Changing current->group_info requires the task lock, too. 589 */ 590#define get_group_info(group_info) do { \ 591 atomic_inc(&(group_info)->usage); \ 592} while (0) 593 594#define put_group_info(group_info) do { \ 595 if (atomic_dec_and_test(&(group_info)->usage)) \ 596 groups_free(group_info); \ 597} while (0) 598 599extern struct group_info *groups_alloc(int gidsetsize); 600extern void groups_free(struct group_info *group_info); 601extern int set_current_groups(struct group_info *group_info); 602extern int groups_search(struct group_info *group_info, gid_t grp); 603/* access the groups "array" with this macro */ 604#define GROUP_AT(gi, i) \ 605 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) 606 607#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 608extern void prefetch_stack(struct task_struct*); 609#else 610static inline void prefetch_stack(struct task_struct *t) { } 611#endif 612 613struct audit_context; /* See audit.c */ 614struct mempolicy; 615 616struct task_struct { 617 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 618 struct thread_info *thread_info; 619 atomic_t usage; 620 unsigned long flags; /* per process flags, defined below */ 621 unsigned long ptrace; 622 623 int lock_depth; /* BKL lock depth */ 624 625#if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW) 626 int oncpu; 627#endif 628 int prio, static_prio; 629 struct list_head run_list; 630 prio_array_t *array; 631 632 unsigned short ioprio; 633 634 unsigned long sleep_avg; 635 unsigned long long timestamp, last_ran; 636 unsigned long long sched_time; /* sched_clock time spent running */ 637 int activated; 638 639 unsigned long policy; 640 cpumask_t cpus_allowed; 641 unsigned int time_slice, first_time_slice; 642 643#ifdef CONFIG_SCHEDSTATS 644 struct sched_info sched_info; 645#endif 646 647 struct list_head tasks; 648 /* 649 * ptrace_list/ptrace_children forms the list of my children 650 * that were stolen by a ptracer. 651 */ 652 struct list_head ptrace_children; 653 struct list_head ptrace_list; 654 655 struct mm_struct *mm, *active_mm; 656 657/* task state */ 658 struct linux_binfmt *binfmt; 659 long exit_state; 660 int exit_code, exit_signal; 661 int pdeath_signal; /* The signal sent when the parent dies */ 662 /* ??? */ 663 unsigned long personality; 664 unsigned did_exec:1; 665 pid_t pid; 666 pid_t tgid; 667 /* 668 * pointers to (original) parent process, youngest child, younger sibling, 669 * older sibling, respectively. (p->father can be replaced with 670 * p->parent->pid) 671 */ 672 struct task_struct *real_parent; /* real parent process (when being debugged) */ 673 struct task_struct *parent; /* parent process */ 674 /* 675 * children/sibling forms the list of my children plus the 676 * tasks I'm ptracing. 677 */ 678 struct list_head children; /* list of my children */ 679 struct list_head sibling; /* linkage in my parent's children list */ 680 struct task_struct *group_leader; /* threadgroup leader */ 681 682 /* PID/PID hash table linkage. */ 683 struct pid pids[PIDTYPE_MAX]; 684 685 struct completion *vfork_done; /* for vfork() */ 686 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 687 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 688 689 unsigned long rt_priority; 690 cputime_t utime, stime; 691 unsigned long nvcsw, nivcsw; /* context switch counts */ 692 struct timespec start_time; 693/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 694 unsigned long min_flt, maj_flt; 695 696 cputime_t it_prof_expires, it_virt_expires; 697 unsigned long long it_sched_expires; 698 struct list_head cpu_timers[3]; 699 700/* process credentials */ 701 uid_t uid,euid,suid,fsuid; 702 gid_t gid,egid,sgid,fsgid; 703 struct group_info *group_info; 704 kernel_cap_t cap_effective, cap_inheritable, cap_permitted; 705 unsigned keep_capabilities:1; 706 struct user_struct *user; 707#ifdef CONFIG_KEYS 708 struct key *thread_keyring; /* keyring private to this thread */ 709 unsigned char jit_keyring; /* default keyring to attach requested keys to */ 710#endif 711 int oomkilladj; /* OOM kill score adjustment (bit shift). */ 712 char comm[TASK_COMM_LEN]; /* executable name excluding path 713 - access with [gs]et_task_comm (which lock 714 it with task_lock()) 715 - initialized normally by flush_old_exec */ 716/* file system info */ 717 int link_count, total_link_count; 718/* ipc stuff */ 719 struct sysv_sem sysvsem; 720/* CPU-specific state of this task */ 721 struct thread_struct thread; 722/* filesystem information */ 723 struct fs_struct *fs; 724/* open file information */ 725 struct files_struct *files; 726/* namespace */ 727 struct namespace *namespace; 728/* signal handlers */ 729 struct signal_struct *signal; 730 struct sighand_struct *sighand; 731 732 sigset_t blocked, real_blocked; 733 struct sigpending pending; 734 735 unsigned long sas_ss_sp; 736 size_t sas_ss_size; 737 int (*notifier)(void *priv); 738 void *notifier_data; 739 sigset_t *notifier_mask; 740 741 void *security; 742 struct audit_context *audit_context; 743 seccomp_t seccomp; 744 745/* Thread group tracking */ 746 u32 parent_exec_id; 747 u32 self_exec_id; 748/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 749 spinlock_t alloc_lock; 750/* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */ 751 spinlock_t proc_lock; 752 753/* journalling filesystem info */ 754 void *journal_info; 755 756/* VM state */ 757 struct reclaim_state *reclaim_state; 758 759 struct dentry *proc_dentry; 760 struct backing_dev_info *backing_dev_info; 761 762 struct io_context *io_context; 763 764 unsigned long ptrace_message; 765 siginfo_t *last_siginfo; /* For ptrace use. */ 766/* 767 * current io wait handle: wait queue entry to use for io waits 768 * If this thread is processing aio, this points at the waitqueue 769 * inside the currently handled kiocb. It may be NULL (i.e. default 770 * to a stack based synchronous wait) if its doing sync IO. 771 */ 772 wait_queue_t *io_wait; 773/* i/o counters(bytes read/written, #syscalls */ 774 u64 rchar, wchar, syscr, syscw; 775#if defined(CONFIG_BSD_PROCESS_ACCT) 776 u64 acct_rss_mem1; /* accumulated rss usage */ 777 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 778 clock_t acct_stimexpd; /* clock_t-converted stime since last update */ 779#endif 780#ifdef CONFIG_NUMA 781 struct mempolicy *mempolicy; 782 short il_next; 783#endif 784#ifdef CONFIG_CPUSETS 785 struct cpuset *cpuset; 786 nodemask_t mems_allowed; 787 int cpuset_mems_generation; 788#endif 789 atomic_t fs_excl; /* holding fs exclusive resources */ 790}; 791 792static inline pid_t process_group(struct task_struct *tsk) 793{ 794 return tsk->signal->pgrp; 795} 796 797/** 798 * pid_alive - check that a task structure is not stale 799 * @p: Task structure to be checked. 800 * 801 * Test if a process is not yet dead (at most zombie state) 802 * If pid_alive fails, then pointers within the task structure 803 * can be stale and must not be dereferenced. 804 */ 805static inline int pid_alive(struct task_struct *p) 806{ 807 return p->pids[PIDTYPE_PID].nr != 0; 808} 809 810extern void free_task(struct task_struct *tsk); 811extern void __put_task_struct(struct task_struct *tsk); 812#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 813#define put_task_struct(tsk) \ 814do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0) 815 816/* 817 * Per process flags 818 */ 819#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 820 /* Not implemented yet, only for 486*/ 821#define PF_STARTING 0x00000002 /* being created */ 822#define PF_EXITING 0x00000004 /* getting shut down */ 823#define PF_DEAD 0x00000008 /* Dead */ 824#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 825#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 826#define PF_DUMPCORE 0x00000200 /* dumped core */ 827#define PF_SIGNALED 0x00000400 /* killed by a signal */ 828#define PF_MEMALLOC 0x00000800 /* Allocating memory */ 829#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 830#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 831#define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */ 832#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 833#define PF_FROZEN 0x00010000 /* frozen for system suspend */ 834#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 835#define PF_KSWAPD 0x00040000 /* I am kswapd */ 836#define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 837#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 838#define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */ 839#define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */ 840#define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */ 841 842/* 843 * Only the _current_ task can read/write to tsk->flags, but other 844 * tasks can access tsk->flags in readonly mode for example 845 * with tsk_used_math (like during threaded core dumping). 846 * There is however an exception to this rule during ptrace 847 * or during fork: the ptracer task is allowed to write to the 848 * child->flags of its traced child (same goes for fork, the parent 849 * can write to the child->flags), because we're guaranteed the 850 * child is not running and in turn not changing child->flags 851 * at the same time the parent does it. 852 */ 853#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 854#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 855#define clear_used_math() clear_stopped_child_used_math(current) 856#define set_used_math() set_stopped_child_used_math(current) 857#define conditional_stopped_child_used_math(condition, child) \ 858 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 859#define conditional_used_math(condition) \ 860 conditional_stopped_child_used_math(condition, current) 861#define copy_to_stopped_child_used_math(child) \ 862 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 863/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 864#define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 865#define used_math() tsk_used_math(current) 866 867#ifdef CONFIG_SMP 868extern int set_cpus_allowed(task_t *p, cpumask_t new_mask); 869#else 870static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask) 871{ 872 if (!cpus_intersects(new_mask, cpu_online_map)) 873 return -EINVAL; 874 return 0; 875} 876#endif 877 878extern unsigned long long sched_clock(void); 879extern unsigned long long current_sched_time(const task_t *current_task); 880 881/* sched_exec is called by processes performing an exec */ 882#ifdef CONFIG_SMP 883extern void sched_exec(void); 884#else 885#define sched_exec() {} 886#endif 887 888#ifdef CONFIG_HOTPLUG_CPU 889extern void idle_task_exit(void); 890#else 891static inline void idle_task_exit(void) {} 892#endif 893 894extern void sched_idle_next(void); 895extern void set_user_nice(task_t *p, long nice); 896extern int task_prio(const task_t *p); 897extern int task_nice(const task_t *p); 898extern int can_nice(const task_t *p, const int nice); 899extern int task_curr(const task_t *p); 900extern int idle_cpu(int cpu); 901extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 902extern task_t *idle_task(int cpu); 903 904void yield(void); 905 906/* 907 * The default (Linux) execution domain. 908 */ 909extern struct exec_domain default_exec_domain; 910 911union thread_union { 912 struct thread_info thread_info; 913 unsigned long stack[THREAD_SIZE/sizeof(long)]; 914}; 915 916#ifndef __HAVE_ARCH_KSTACK_END 917static inline int kstack_end(void *addr) 918{ 919 /* Reliable end of stack detection: 920 * Some APM bios versions misalign the stack 921 */ 922 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 923} 924#endif 925 926extern union thread_union init_thread_union; 927extern struct task_struct init_task; 928 929extern struct mm_struct init_mm; 930 931#define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr) 932extern struct task_struct *find_task_by_pid_type(int type, int pid); 933extern void set_special_pids(pid_t session, pid_t pgrp); 934extern void __set_special_pids(pid_t session, pid_t pgrp); 935 936/* per-UID process charging. */ 937extern struct user_struct * alloc_uid(uid_t); 938static inline struct user_struct *get_uid(struct user_struct *u) 939{ 940 atomic_inc(&u->__count); 941 return u; 942} 943extern void free_uid(struct user_struct *); 944extern void switch_uid(struct user_struct *); 945 946#include <asm/current.h> 947 948extern void do_timer(struct pt_regs *); 949 950extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); 951extern int FASTCALL(wake_up_process(struct task_struct * tsk)); 952extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, 953 unsigned long clone_flags)); 954#ifdef CONFIG_SMP 955 extern void kick_process(struct task_struct *tsk); 956#else 957 static inline void kick_process(struct task_struct *tsk) { } 958#endif 959extern void FASTCALL(sched_fork(task_t * p, int clone_flags)); 960extern void FASTCALL(sched_exit(task_t * p)); 961 962extern int in_group_p(gid_t); 963extern int in_egroup_p(gid_t); 964 965extern void proc_caches_init(void); 966extern void flush_signals(struct task_struct *); 967extern void flush_signal_handlers(struct task_struct *, int force_default); 968extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 969 970static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 971{ 972 unsigned long flags; 973 int ret; 974 975 spin_lock_irqsave(&tsk->sighand->siglock, flags); 976 ret = dequeue_signal(tsk, mask, info); 977 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 978 979 return ret; 980} 981 982extern void block_all_signals(int (*notifier)(void *priv), void *priv, 983 sigset_t *mask); 984extern void unblock_all_signals(void); 985extern void release_task(struct task_struct * p); 986extern int send_sig_info(int, struct siginfo *, struct task_struct *); 987extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); 988extern int force_sigsegv(int, struct task_struct *); 989extern int force_sig_info(int, struct siginfo *, struct task_struct *); 990extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp); 991extern int kill_pg_info(int, struct siginfo *, pid_t); 992extern int kill_proc_info(int, struct siginfo *, pid_t); 993extern void do_notify_parent(struct task_struct *, int); 994extern void force_sig(int, struct task_struct *); 995extern void force_sig_specific(int, struct task_struct *); 996extern int send_sig(int, struct task_struct *, int); 997extern void zap_other_threads(struct task_struct *p); 998extern int kill_pg(pid_t, int, int); 999extern int kill_sl(pid_t, int, int); 1000extern int kill_proc(pid_t, int, int); 1001extern struct sigqueue *sigqueue_alloc(void); 1002extern void sigqueue_free(struct sigqueue *); 1003extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); 1004extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); 1005extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *); 1006extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 1007 1008/* These can be the second arg to send_sig_info/send_group_sig_info. */ 1009#define SEND_SIG_NOINFO ((struct siginfo *) 0) 1010#define SEND_SIG_PRIV ((struct siginfo *) 1) 1011#define SEND_SIG_FORCED ((struct siginfo *) 2) 1012 1013/* True if we are on the alternate signal stack. */ 1014 1015static inline int on_sig_stack(unsigned long sp) 1016{ 1017 return (sp - current->sas_ss_sp < current->sas_ss_size); 1018} 1019 1020static inline int sas_ss_flags(unsigned long sp) 1021{ 1022 return (current->sas_ss_size == 0 ? SS_DISABLE 1023 : on_sig_stack(sp) ? SS_ONSTACK : 0); 1024} 1025 1026 1027#ifdef CONFIG_SECURITY 1028/* code is in security.c */ 1029extern int capable(int cap); 1030#else 1031static inline int capable(int cap) 1032{ 1033 if (cap_raised(current->cap_effective, cap)) { 1034 current->flags |= PF_SUPERPRIV; 1035 return 1; 1036 } 1037 return 0; 1038} 1039#endif 1040 1041/* 1042 * Routines for handling mm_structs 1043 */ 1044extern struct mm_struct * mm_alloc(void); 1045 1046/* mmdrop drops the mm and the page tables */ 1047extern void FASTCALL(__mmdrop(struct mm_struct *)); 1048static inline void mmdrop(struct mm_struct * mm) 1049{ 1050 if (atomic_dec_and_test(&mm->mm_count)) 1051 __mmdrop(mm); 1052} 1053 1054/* mmput gets rid of the mappings and all user-space */ 1055extern void mmput(struct mm_struct *); 1056/* Grab a reference to a task's mm, if it is not already going away */ 1057extern struct mm_struct *get_task_mm(struct task_struct *task); 1058/* Remove the current tasks stale references to the old mm_struct */ 1059extern void mm_release(struct task_struct *, struct mm_struct *); 1060 1061extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 1062extern void flush_thread(void); 1063extern void exit_thread(void); 1064 1065extern void exit_files(struct task_struct *); 1066extern void exit_signal(struct task_struct *); 1067extern void __exit_signal(struct task_struct *); 1068extern void exit_sighand(struct task_struct *); 1069extern void __exit_sighand(struct task_struct *); 1070extern void exit_itimers(struct signal_struct *); 1071 1072extern NORET_TYPE void do_group_exit(int); 1073 1074extern void daemonize(const char *, ...); 1075extern int allow_signal(int); 1076extern int disallow_signal(int); 1077extern task_t *child_reaper; 1078 1079extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 1080extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 1081task_t *fork_idle(int); 1082 1083extern void set_task_comm(struct task_struct *tsk, char *from); 1084extern void get_task_comm(char *to, struct task_struct *tsk); 1085 1086#ifdef CONFIG_SMP 1087extern void wait_task_inactive(task_t * p); 1088#else 1089#define wait_task_inactive(p) do { } while (0) 1090#endif 1091 1092#define remove_parent(p) list_del_init(&(p)->sibling) 1093#define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children) 1094 1095#define REMOVE_LINKS(p) do { \ 1096 if (thread_group_leader(p)) \ 1097 list_del_init(&(p)->tasks); \ 1098 remove_parent(p); \ 1099 } while (0) 1100 1101#define SET_LINKS(p) do { \ 1102 if (thread_group_leader(p)) \ 1103 list_add_tail(&(p)->tasks,&init_task.tasks); \ 1104 add_parent(p, (p)->parent); \ 1105 } while (0) 1106 1107#define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks) 1108#define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks) 1109 1110#define for_each_process(p) \ 1111 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 1112 1113/* 1114 * Careful: do_each_thread/while_each_thread is a double loop so 1115 * 'break' will not work as expected - use goto instead. 1116 */ 1117#define do_each_thread(g, t) \ 1118 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 1119 1120#define while_each_thread(g, t) \ 1121 while ((t = next_thread(t)) != g) 1122 1123extern task_t * FASTCALL(next_thread(const task_t *p)); 1124 1125#define thread_group_leader(p) (p->pid == p->tgid) 1126 1127static inline int thread_group_empty(task_t *p) 1128{ 1129 return list_empty(&p->pids[PIDTYPE_TGID].pid_list); 1130} 1131 1132#define delay_group_leader(p) \ 1133 (thread_group_leader(p) && !thread_group_empty(p)) 1134 1135extern void unhash_process(struct task_struct *p); 1136 1137/* 1138 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring 1139 * subscriptions and synchronises with wait4(). Also used in procfs. Also 1140 * pins the final release of task.io_context. 1141 * 1142 * Nests both inside and outside of read_lock(&tasklist_lock). 1143 * It must not be nested with write_lock_irq(&tasklist_lock), 1144 * neither inside nor outside. 1145 */ 1146static inline void task_lock(struct task_struct *p) 1147{ 1148 spin_lock(&p->alloc_lock); 1149} 1150 1151static inline void task_unlock(struct task_struct *p) 1152{ 1153 spin_unlock(&p->alloc_lock); 1154} 1155 1156/* set thread flags in other task's structures 1157 * - see asm/thread_info.h for TIF_xxxx flags available 1158 */ 1159static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 1160{ 1161 set_ti_thread_flag(tsk->thread_info,flag); 1162} 1163 1164static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1165{ 1166 clear_ti_thread_flag(tsk->thread_info,flag); 1167} 1168 1169static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 1170{ 1171 return test_and_set_ti_thread_flag(tsk->thread_info,flag); 1172} 1173 1174static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1175{ 1176 return test_and_clear_ti_thread_flag(tsk->thread_info,flag); 1177} 1178 1179static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 1180{ 1181 return test_ti_thread_flag(tsk->thread_info,flag); 1182} 1183 1184static inline void set_tsk_need_resched(struct task_struct *tsk) 1185{ 1186 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1187} 1188 1189static inline void clear_tsk_need_resched(struct task_struct *tsk) 1190{ 1191 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1192} 1193 1194static inline int signal_pending(struct task_struct *p) 1195{ 1196 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 1197} 1198 1199static inline int need_resched(void) 1200{ 1201 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 1202} 1203 1204/* 1205 * cond_resched() and cond_resched_lock(): latency reduction via 1206 * explicit rescheduling in places that are safe. The return 1207 * value indicates whether a reschedule was done in fact. 1208 * cond_resched_lock() will drop the spinlock before scheduling, 1209 * cond_resched_softirq() will enable bhs before scheduling. 1210 */ 1211extern int cond_resched(void); 1212extern int cond_resched_lock(spinlock_t * lock); 1213extern int cond_resched_softirq(void); 1214 1215/* 1216 * Does a critical section need to be broken due to another 1217 * task waiting?: 1218 */ 1219#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) 1220# define need_lockbreak(lock) ((lock)->break_lock) 1221#else 1222# define need_lockbreak(lock) 0 1223#endif 1224 1225/* 1226 * Does a critical section need to be broken due to another 1227 * task waiting or preemption being signalled: 1228 */ 1229static inline int lock_need_resched(spinlock_t *lock) 1230{ 1231 if (need_lockbreak(lock) || need_resched()) 1232 return 1; 1233 return 0; 1234} 1235 1236/* Reevaluate whether the task has signals pending delivery. 1237 This is required every time the blocked sigset_t changes. 1238 callers must hold sighand->siglock. */ 1239 1240extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t)); 1241extern void recalc_sigpending(void); 1242 1243extern void signal_wake_up(struct task_struct *t, int resume_stopped); 1244 1245/* 1246 * Wrappers for p->thread_info->cpu access. No-op on UP. 1247 */ 1248#ifdef CONFIG_SMP 1249 1250static inline unsigned int task_cpu(const struct task_struct *p) 1251{ 1252 return p->thread_info->cpu; 1253} 1254 1255static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 1256{ 1257 p->thread_info->cpu = cpu; 1258} 1259 1260#else 1261 1262static inline unsigned int task_cpu(const struct task_struct *p) 1263{ 1264 return 0; 1265} 1266 1267static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 1268{ 1269} 1270 1271#endif /* CONFIG_SMP */ 1272 1273#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1274extern void arch_pick_mmap_layout(struct mm_struct *mm); 1275#else 1276static inline void arch_pick_mmap_layout(struct mm_struct *mm) 1277{ 1278 mm->mmap_base = TASK_UNMAPPED_BASE; 1279 mm->get_unmapped_area = arch_get_unmapped_area; 1280 mm->unmap_area = arch_unmap_area; 1281} 1282#endif 1283 1284extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); 1285extern long sched_getaffinity(pid_t pid, cpumask_t *mask); 1286 1287#ifdef CONFIG_MAGIC_SYSRQ 1288 1289extern void normalize_rt_tasks(void); 1290 1291#endif 1292 1293#ifdef CONFIG_PM 1294/* 1295 * Check if a process has been frozen 1296 */ 1297static inline int frozen(struct task_struct *p) 1298{ 1299 return p->flags & PF_FROZEN; 1300} 1301 1302/* 1303 * Check if there is a request to freeze a process 1304 */ 1305static inline int freezing(struct task_struct *p) 1306{ 1307 return p->flags & PF_FREEZE; 1308} 1309 1310/* 1311 * Request that a process be frozen 1312 * FIXME: SMP problem. We may not modify other process' flags! 1313 */ 1314static inline void freeze(struct task_struct *p) 1315{ 1316 p->flags |= PF_FREEZE; 1317} 1318 1319/* 1320 * Wake up a frozen process 1321 */ 1322static inline int thaw_process(struct task_struct *p) 1323{ 1324 if (frozen(p)) { 1325 p->flags &= ~PF_FROZEN; 1326 wake_up_process(p); 1327 return 1; 1328 } 1329 return 0; 1330} 1331 1332/* 1333 * freezing is complete, mark process as frozen 1334 */ 1335static inline void frozen_process(struct task_struct *p) 1336{ 1337 p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN; 1338} 1339 1340extern void refrigerator(void); 1341extern int freeze_processes(void); 1342extern void thaw_processes(void); 1343 1344static inline int try_to_freeze(void) 1345{ 1346 if (freezing(current)) { 1347 refrigerator(); 1348 return 1; 1349 } else 1350 return 0; 1351} 1352#else 1353static inline int frozen(struct task_struct *p) { return 0; } 1354static inline int freezing(struct task_struct *p) { return 0; } 1355static inline void freeze(struct task_struct *p) { BUG(); } 1356static inline int thaw_process(struct task_struct *p) { return 1; } 1357static inline void frozen_process(struct task_struct *p) { BUG(); } 1358 1359static inline void refrigerator(void) {} 1360static inline int freeze_processes(void) { BUG(); return 0; } 1361static inline void thaw_processes(void) {} 1362 1363static inline int try_to_freeze(void) { return 0; } 1364 1365#endif /* CONFIG_PM */ 1366#endif /* __KERNEL__ */ 1367 1368#endif 1369