sched.h revision 78f2c7db6068fd6ef75b8c120f04a388848eacb5
1#ifndef _LINUX_SCHED_H 2#define _LINUX_SCHED_H 3 4/* 5 * cloning flags: 6 */ 7#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ 8#define CLONE_VM 0x00000100 /* set if VM shared between processes */ 9#define CLONE_FS 0x00000200 /* set if fs info shared between processes */ 10#define CLONE_FILES 0x00000400 /* set if open files shared between processes */ 11#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ 12#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ 13#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ 14#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ 15#define CLONE_THREAD 0x00010000 /* Same thread group? */ 16#define CLONE_NEWNS 0x00020000 /* New namespace group? */ 17#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ 18#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ 19#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ 20#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ 21#define CLONE_DETACHED 0x00400000 /* Unused, ignored */ 22#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ 23#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ 24#define CLONE_STOPPED 0x02000000 /* Start in stopped state */ 25#define CLONE_NEWUTS 0x04000000 /* New utsname group? */ 26#define CLONE_NEWIPC 0x08000000 /* New ipcs */ 27#define CLONE_NEWUSER 0x10000000 /* New user namespace */ 28#define CLONE_NEWPID 0x20000000 /* New pid namespace */ 29#define CLONE_NEWNET 0x40000000 /* New network namespace */ 30 31/* 32 * Scheduling policies 33 */ 34#define SCHED_NORMAL 0 35#define SCHED_FIFO 1 36#define SCHED_RR 2 37#define SCHED_BATCH 3 38/* SCHED_ISO: reserved but not implemented yet */ 39#define SCHED_IDLE 5 40 41#ifdef __KERNEL__ 42 43struct sched_param { 44 int sched_priority; 45}; 46 47#include <asm/param.h> /* for HZ */ 48 49#include <linux/capability.h> 50#include <linux/threads.h> 51#include <linux/kernel.h> 52#include <linux/types.h> 53#include <linux/timex.h> 54#include <linux/jiffies.h> 55#include <linux/rbtree.h> 56#include <linux/thread_info.h> 57#include <linux/cpumask.h> 58#include <linux/errno.h> 59#include <linux/nodemask.h> 60#include <linux/mm_types.h> 61 62#include <asm/system.h> 63#include <asm/semaphore.h> 64#include <asm/page.h> 65#include <asm/ptrace.h> 66#include <asm/cputime.h> 67 68#include <linux/smp.h> 69#include <linux/sem.h> 70#include <linux/signal.h> 71#include <linux/securebits.h> 72#include <linux/fs_struct.h> 73#include <linux/compiler.h> 74#include <linux/completion.h> 75#include <linux/pid.h> 76#include <linux/percpu.h> 77#include <linux/topology.h> 78#include <linux/proportions.h> 79#include <linux/seccomp.h> 80#include <linux/rcupdate.h> 81#include <linux/futex.h> 82#include <linux/rtmutex.h> 83 84#include <linux/time.h> 85#include <linux/param.h> 86#include <linux/resource.h> 87#include <linux/timer.h> 88#include <linux/hrtimer.h> 89#include <linux/task_io_accounting.h> 90#include <linux/kobject.h> 91 92#include <asm/processor.h> 93 94struct exec_domain; 95struct futex_pi_state; 96struct bio; 97 98/* 99 * List of flags we want to share for kernel threads, 100 * if only because they are not used by them anyway. 101 */ 102#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 103 104/* 105 * These are the constant used to fake the fixed-point load-average 106 * counting. Some notes: 107 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 108 * a load-average precision of 10 bits integer + 11 bits fractional 109 * - if you want to count load-averages more often, you need more 110 * precision, or rounding will get you. With 2-second counting freq, 111 * the EXP_n values would be 1981, 2034 and 2043 if still using only 112 * 11 bit fractions. 113 */ 114extern unsigned long avenrun[]; /* Load averages */ 115 116#define FSHIFT 11 /* nr of bits of precision */ 117#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 118#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ 119#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 120#define EXP_5 2014 /* 1/exp(5sec/5min) */ 121#define EXP_15 2037 /* 1/exp(5sec/15min) */ 122 123#define CALC_LOAD(load,exp,n) \ 124 load *= exp; \ 125 load += n*(FIXED_1-exp); \ 126 load >>= FSHIFT; 127 128extern unsigned long total_forks; 129extern int nr_threads; 130DECLARE_PER_CPU(unsigned long, process_counts); 131extern int nr_processes(void); 132extern unsigned long nr_running(void); 133extern unsigned long nr_uninterruptible(void); 134extern unsigned long nr_active(void); 135extern unsigned long nr_iowait(void); 136extern unsigned long weighted_cpuload(const int cpu); 137 138struct seq_file; 139struct cfs_rq; 140struct task_group; 141#ifdef CONFIG_SCHED_DEBUG 142extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 143extern void proc_sched_set_task(struct task_struct *p); 144extern void 145print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 146#else 147static inline void 148proc_sched_show_task(struct task_struct *p, struct seq_file *m) 149{ 150} 151static inline void proc_sched_set_task(struct task_struct *p) 152{ 153} 154static inline void 155print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 156{ 157} 158#endif 159 160/* 161 * Task state bitmask. NOTE! These bits are also 162 * encoded in fs/proc/array.c: get_task_state(). 163 * 164 * We have two separate sets of flags: task->state 165 * is about runnability, while task->exit_state are 166 * about the task exiting. Confusing, but this way 167 * modifying one set can't modify the other one by 168 * mistake. 169 */ 170#define TASK_RUNNING 0 171#define TASK_INTERRUPTIBLE 1 172#define TASK_UNINTERRUPTIBLE 2 173#define TASK_STOPPED 4 174#define TASK_TRACED 8 175/* in tsk->exit_state */ 176#define EXIT_ZOMBIE 16 177#define EXIT_DEAD 32 178/* in tsk->state again */ 179#define TASK_DEAD 64 180 181#define __set_task_state(tsk, state_value) \ 182 do { (tsk)->state = (state_value); } while (0) 183#define set_task_state(tsk, state_value) \ 184 set_mb((tsk)->state, (state_value)) 185 186/* 187 * set_current_state() includes a barrier so that the write of current->state 188 * is correctly serialised wrt the caller's subsequent test of whether to 189 * actually sleep: 190 * 191 * set_current_state(TASK_UNINTERRUPTIBLE); 192 * if (do_i_need_to_sleep()) 193 * schedule(); 194 * 195 * If the caller does not need such serialisation then use __set_current_state() 196 */ 197#define __set_current_state(state_value) \ 198 do { current->state = (state_value); } while (0) 199#define set_current_state(state_value) \ 200 set_mb(current->state, (state_value)) 201 202/* Task command name length */ 203#define TASK_COMM_LEN 16 204 205#include <linux/spinlock.h> 206 207/* 208 * This serializes "schedule()" and also protects 209 * the run-queue from deletions/modifications (but 210 * _adding_ to the beginning of the run-queue has 211 * a separate lock). 212 */ 213extern rwlock_t tasklist_lock; 214extern spinlock_t mmlist_lock; 215 216struct task_struct; 217 218extern void sched_init(void); 219extern void sched_init_smp(void); 220extern void init_idle(struct task_struct *idle, int cpu); 221extern void init_idle_bootup_task(struct task_struct *idle); 222 223extern cpumask_t nohz_cpu_mask; 224#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 225extern int select_nohz_load_balancer(int cpu); 226#else 227static inline int select_nohz_load_balancer(int cpu) 228{ 229 return 0; 230} 231#endif 232 233/* 234 * Only dump TASK_* tasks. (0 for all tasks) 235 */ 236extern void show_state_filter(unsigned long state_filter); 237 238static inline void show_state(void) 239{ 240 show_state_filter(0); 241} 242 243extern void show_regs(struct pt_regs *); 244 245/* 246 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 247 * task), SP is the stack pointer of the first frame that should be shown in the back 248 * trace (or NULL if the entire call-chain of the task should be shown). 249 */ 250extern void show_stack(struct task_struct *task, unsigned long *sp); 251 252void io_schedule(void); 253long io_schedule_timeout(long timeout); 254 255extern void cpu_init (void); 256extern void trap_init(void); 257extern void account_process_tick(struct task_struct *task, int user); 258extern void update_process_times(int user); 259extern void scheduler_tick(void); 260 261extern void sched_show_task(struct task_struct *p); 262 263#ifdef CONFIG_DETECT_SOFTLOCKUP 264extern void softlockup_tick(void); 265extern void spawn_softlockup_task(void); 266extern void touch_softlockup_watchdog(void); 267extern void touch_all_softlockup_watchdogs(void); 268extern int softlockup_thresh; 269extern unsigned long sysctl_hung_task_check_count; 270extern unsigned long sysctl_hung_task_timeout_secs; 271extern long sysctl_hung_task_warnings; 272#else 273static inline void softlockup_tick(void) 274{ 275} 276static inline void spawn_softlockup_task(void) 277{ 278} 279static inline void touch_softlockup_watchdog(void) 280{ 281} 282static inline void touch_all_softlockup_watchdogs(void) 283{ 284} 285#endif 286 287 288/* Attach to any functions which should be ignored in wchan output. */ 289#define __sched __attribute__((__section__(".sched.text"))) 290 291/* Linker adds these: start and end of __sched functions */ 292extern char __sched_text_start[], __sched_text_end[]; 293 294/* Is this address in the __sched functions? */ 295extern int in_sched_functions(unsigned long addr); 296 297#define MAX_SCHEDULE_TIMEOUT LONG_MAX 298extern signed long FASTCALL(schedule_timeout(signed long timeout)); 299extern signed long schedule_timeout_interruptible(signed long timeout); 300extern signed long schedule_timeout_uninterruptible(signed long timeout); 301asmlinkage void schedule(void); 302 303struct nsproxy; 304struct user_namespace; 305 306/* Maximum number of active map areas.. This is a random (large) number */ 307#define DEFAULT_MAX_MAP_COUNT 65536 308 309extern int sysctl_max_map_count; 310 311#include <linux/aio.h> 312 313extern unsigned long 314arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 315 unsigned long, unsigned long); 316extern unsigned long 317arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 318 unsigned long len, unsigned long pgoff, 319 unsigned long flags); 320extern void arch_unmap_area(struct mm_struct *, unsigned long); 321extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 322 323#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS 324/* 325 * The mm counters are not protected by its page_table_lock, 326 * so must be incremented atomically. 327 */ 328#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) 329#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) 330#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) 331#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) 332#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) 333 334#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 335/* 336 * The mm counters are protected by its page_table_lock, 337 * so can be incremented directly. 338 */ 339#define set_mm_counter(mm, member, value) (mm)->_##member = (value) 340#define get_mm_counter(mm, member) ((mm)->_##member) 341#define add_mm_counter(mm, member, value) (mm)->_##member += (value) 342#define inc_mm_counter(mm, member) (mm)->_##member++ 343#define dec_mm_counter(mm, member) (mm)->_##member-- 344 345#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 346 347#define get_mm_rss(mm) \ 348 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) 349#define update_hiwater_rss(mm) do { \ 350 unsigned long _rss = get_mm_rss(mm); \ 351 if ((mm)->hiwater_rss < _rss) \ 352 (mm)->hiwater_rss = _rss; \ 353} while (0) 354#define update_hiwater_vm(mm) do { \ 355 if ((mm)->hiwater_vm < (mm)->total_vm) \ 356 (mm)->hiwater_vm = (mm)->total_vm; \ 357} while (0) 358 359extern void set_dumpable(struct mm_struct *mm, int value); 360extern int get_dumpable(struct mm_struct *mm); 361 362/* mm flags */ 363/* dumpable bits */ 364#define MMF_DUMPABLE 0 /* core dump is permitted */ 365#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 366#define MMF_DUMPABLE_BITS 2 367 368/* coredump filter bits */ 369#define MMF_DUMP_ANON_PRIVATE 2 370#define MMF_DUMP_ANON_SHARED 3 371#define MMF_DUMP_MAPPED_PRIVATE 4 372#define MMF_DUMP_MAPPED_SHARED 5 373#define MMF_DUMP_ELF_HEADERS 6 374#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 375#define MMF_DUMP_FILTER_BITS 5 376#define MMF_DUMP_FILTER_MASK \ 377 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 378#define MMF_DUMP_FILTER_DEFAULT \ 379 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED)) 380 381struct sighand_struct { 382 atomic_t count; 383 struct k_sigaction action[_NSIG]; 384 spinlock_t siglock; 385 wait_queue_head_t signalfd_wqh; 386}; 387 388struct pacct_struct { 389 int ac_flag; 390 long ac_exitcode; 391 unsigned long ac_mem; 392 cputime_t ac_utime, ac_stime; 393 unsigned long ac_minflt, ac_majflt; 394}; 395 396/* 397 * NOTE! "signal_struct" does not have it's own 398 * locking, because a shared signal_struct always 399 * implies a shared sighand_struct, so locking 400 * sighand_struct is always a proper superset of 401 * the locking of signal_struct. 402 */ 403struct signal_struct { 404 atomic_t count; 405 atomic_t live; 406 407 wait_queue_head_t wait_chldexit; /* for wait4() */ 408 409 /* current thread group signal load-balancing target: */ 410 struct task_struct *curr_target; 411 412 /* shared signal handling: */ 413 struct sigpending shared_pending; 414 415 /* thread group exit support */ 416 int group_exit_code; 417 /* overloaded: 418 * - notify group_exit_task when ->count is equal to notify_count 419 * - everyone except group_exit_task is stopped during signal delivery 420 * of fatal signals, group_exit_task processes the signal. 421 */ 422 struct task_struct *group_exit_task; 423 int notify_count; 424 425 /* thread group stop support, overloads group_exit_code too */ 426 int group_stop_count; 427 unsigned int flags; /* see SIGNAL_* flags below */ 428 429 /* POSIX.1b Interval Timers */ 430 struct list_head posix_timers; 431 432 /* ITIMER_REAL timer for the process */ 433 struct hrtimer real_timer; 434 struct task_struct *tsk; 435 ktime_t it_real_incr; 436 437 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 438 cputime_t it_prof_expires, it_virt_expires; 439 cputime_t it_prof_incr, it_virt_incr; 440 441 /* job control IDs */ 442 443 /* 444 * pgrp and session fields are deprecated. 445 * use the task_session_Xnr and task_pgrp_Xnr routines below 446 */ 447 448 union { 449 pid_t pgrp __deprecated; 450 pid_t __pgrp; 451 }; 452 453 struct pid *tty_old_pgrp; 454 455 union { 456 pid_t session __deprecated; 457 pid_t __session; 458 }; 459 460 /* boolean value for session group leader */ 461 int leader; 462 463 struct tty_struct *tty; /* NULL if no tty */ 464 465 /* 466 * Cumulative resource counters for dead threads in the group, 467 * and for reaped dead child processes forked by this group. 468 * Live threads maintain their own counters and add to these 469 * in __exit_signal, except for the group leader. 470 */ 471 cputime_t utime, stime, cutime, cstime; 472 cputime_t gtime; 473 cputime_t cgtime; 474 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 475 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 476 unsigned long inblock, oublock, cinblock, coublock; 477 478 /* 479 * Cumulative ns of scheduled CPU time for dead threads in the 480 * group, not including a zombie group leader. (This only differs 481 * from jiffies_to_ns(utime + stime) if sched_clock uses something 482 * other than jiffies.) 483 */ 484 unsigned long long sum_sched_runtime; 485 486 /* 487 * We don't bother to synchronize most readers of this at all, 488 * because there is no reader checking a limit that actually needs 489 * to get both rlim_cur and rlim_max atomically, and either one 490 * alone is a single word that can safely be read normally. 491 * getrlimit/setrlimit use task_lock(current->group_leader) to 492 * protect this instead of the siglock, because they really 493 * have no need to disable irqs. 494 */ 495 struct rlimit rlim[RLIM_NLIMITS]; 496 497 struct list_head cpu_timers[3]; 498 499 /* keep the process-shared keyrings here so that they do the right 500 * thing in threads created with CLONE_THREAD */ 501#ifdef CONFIG_KEYS 502 struct key *session_keyring; /* keyring inherited over fork */ 503 struct key *process_keyring; /* keyring private to this process */ 504#endif 505#ifdef CONFIG_BSD_PROCESS_ACCT 506 struct pacct_struct pacct; /* per-process accounting information */ 507#endif 508#ifdef CONFIG_TASKSTATS 509 struct taskstats *stats; 510#endif 511#ifdef CONFIG_AUDIT 512 unsigned audit_tty; 513 struct tty_audit_buf *tty_audit_buf; 514#endif 515}; 516 517/* Context switch must be unlocked if interrupts are to be enabled */ 518#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 519# define __ARCH_WANT_UNLOCKED_CTXSW 520#endif 521 522/* 523 * Bits in flags field of signal_struct. 524 */ 525#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 526#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 527#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 528#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 529 530/* 531 * Some day this will be a full-fledged user tracking system.. 532 */ 533struct user_struct { 534 atomic_t __count; /* reference count */ 535 atomic_t processes; /* How many processes does this user have? */ 536 atomic_t files; /* How many open files does this user have? */ 537 atomic_t sigpending; /* How many pending signals does this user have? */ 538#ifdef CONFIG_INOTIFY_USER 539 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 540 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 541#endif 542#ifdef CONFIG_POSIX_MQUEUE 543 /* protected by mq_lock */ 544 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 545#endif 546 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 547 548#ifdef CONFIG_KEYS 549 struct key *uid_keyring; /* UID specific keyring */ 550 struct key *session_keyring; /* UID's default session keyring */ 551#endif 552 553 /* Hash table maintenance information */ 554 struct hlist_node uidhash_node; 555 uid_t uid; 556 557#ifdef CONFIG_FAIR_USER_SCHED 558 struct task_group *tg; 559#ifdef CONFIG_SYSFS 560 struct kobject kobj; 561 struct work_struct work; 562#endif 563#endif 564}; 565 566extern int uids_sysfs_init(void); 567 568extern struct user_struct *find_user(uid_t); 569 570extern struct user_struct root_user; 571#define INIT_USER (&root_user) 572 573struct backing_dev_info; 574struct reclaim_state; 575 576#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 577struct sched_info { 578 /* cumulative counters */ 579 unsigned long pcount; /* # of times run on this cpu */ 580 unsigned long long cpu_time, /* time spent on the cpu */ 581 run_delay; /* time spent waiting on a runqueue */ 582 583 /* timestamps */ 584 unsigned long long last_arrival,/* when we last ran on a cpu */ 585 last_queued; /* when we were last queued to run */ 586#ifdef CONFIG_SCHEDSTATS 587 /* BKL stats */ 588 unsigned int bkl_count; 589#endif 590}; 591#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 592 593#ifdef CONFIG_SCHEDSTATS 594extern const struct file_operations proc_schedstat_operations; 595#endif /* CONFIG_SCHEDSTATS */ 596 597#ifdef CONFIG_TASK_DELAY_ACCT 598struct task_delay_info { 599 spinlock_t lock; 600 unsigned int flags; /* Private per-task flags */ 601 602 /* For each stat XXX, add following, aligned appropriately 603 * 604 * struct timespec XXX_start, XXX_end; 605 * u64 XXX_delay; 606 * u32 XXX_count; 607 * 608 * Atomicity of updates to XXX_delay, XXX_count protected by 609 * single lock above (split into XXX_lock if contention is an issue). 610 */ 611 612 /* 613 * XXX_count is incremented on every XXX operation, the delay 614 * associated with the operation is added to XXX_delay. 615 * XXX_delay contains the accumulated delay time in nanoseconds. 616 */ 617 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 618 u64 blkio_delay; /* wait for sync block io completion */ 619 u64 swapin_delay; /* wait for swapin block io completion */ 620 u32 blkio_count; /* total count of the number of sync block */ 621 /* io operations performed */ 622 u32 swapin_count; /* total count of the number of swapin block */ 623 /* io operations performed */ 624}; 625#endif /* CONFIG_TASK_DELAY_ACCT */ 626 627static inline int sched_info_on(void) 628{ 629#ifdef CONFIG_SCHEDSTATS 630 return 1; 631#elif defined(CONFIG_TASK_DELAY_ACCT) 632 extern int delayacct_on; 633 return delayacct_on; 634#else 635 return 0; 636#endif 637} 638 639enum cpu_idle_type { 640 CPU_IDLE, 641 CPU_NOT_IDLE, 642 CPU_NEWLY_IDLE, 643 CPU_MAX_IDLE_TYPES 644}; 645 646/* 647 * sched-domains (multiprocessor balancing) declarations: 648 */ 649 650/* 651 * Increase resolution of nice-level calculations: 652 */ 653#define SCHED_LOAD_SHIFT 10 654#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 655 656#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE 657 658#ifdef CONFIG_SMP 659#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 660#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 661#define SD_BALANCE_EXEC 4 /* Balance on exec */ 662#define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 663#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 664#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 665#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 666#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 667#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ 668#define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ 669#define SD_SERIALIZE 1024 /* Only a single load balancing instance */ 670 671#define BALANCE_FOR_MC_POWER \ 672 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0) 673 674#define BALANCE_FOR_PKG_POWER \ 675 ((sched_mc_power_savings || sched_smt_power_savings) ? \ 676 SD_POWERSAVINGS_BALANCE : 0) 677 678#define test_sd_parent(sd, flag) ((sd->parent && \ 679 (sd->parent->flags & flag)) ? 1 : 0) 680 681 682struct sched_group { 683 struct sched_group *next; /* Must be a circular list */ 684 cpumask_t cpumask; 685 686 /* 687 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 688 * single CPU. This is read only (except for setup, hotplug CPU). 689 * Note : Never change cpu_power without recompute its reciprocal 690 */ 691 unsigned int __cpu_power; 692 /* 693 * reciprocal value of cpu_power to avoid expensive divides 694 * (see include/linux/reciprocal_div.h) 695 */ 696 u32 reciprocal_cpu_power; 697}; 698 699struct sched_domain { 700 /* These fields must be setup */ 701 struct sched_domain *parent; /* top domain must be null terminated */ 702 struct sched_domain *child; /* bottom domain must be null terminated */ 703 struct sched_group *groups; /* the balancing groups of the domain */ 704 cpumask_t span; /* span of all CPUs in this domain */ 705 unsigned long min_interval; /* Minimum balance interval ms */ 706 unsigned long max_interval; /* Maximum balance interval ms */ 707 unsigned int busy_factor; /* less balancing by factor if busy */ 708 unsigned int imbalance_pct; /* No balance until over watermark */ 709 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 710 unsigned int busy_idx; 711 unsigned int idle_idx; 712 unsigned int newidle_idx; 713 unsigned int wake_idx; 714 unsigned int forkexec_idx; 715 int flags; /* See SD_* */ 716 717 /* Runtime fields. */ 718 unsigned long last_balance; /* init to jiffies. units in jiffies */ 719 unsigned int balance_interval; /* initialise to 1. units in ms. */ 720 unsigned int nr_balance_failed; /* initialise to 0 */ 721 722#ifdef CONFIG_SCHEDSTATS 723 /* load_balance() stats */ 724 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 725 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 726 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 727 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 728 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 729 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 730 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 731 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 732 733 /* Active load balancing */ 734 unsigned int alb_count; 735 unsigned int alb_failed; 736 unsigned int alb_pushed; 737 738 /* SD_BALANCE_EXEC stats */ 739 unsigned int sbe_count; 740 unsigned int sbe_balanced; 741 unsigned int sbe_pushed; 742 743 /* SD_BALANCE_FORK stats */ 744 unsigned int sbf_count; 745 unsigned int sbf_balanced; 746 unsigned int sbf_pushed; 747 748 /* try_to_wake_up() stats */ 749 unsigned int ttwu_wake_remote; 750 unsigned int ttwu_move_affine; 751 unsigned int ttwu_move_balance; 752#endif 753}; 754 755extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new); 756 757#endif /* CONFIG_SMP */ 758 759/* 760 * A runqueue laden with a single nice 0 task scores a weighted_cpuload of 761 * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a 762 * task of nice 0 or enough lower priority tasks to bring up the 763 * weighted_cpuload 764 */ 765static inline int above_background_load(void) 766{ 767 unsigned long cpu; 768 769 for_each_online_cpu(cpu) { 770 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE) 771 return 1; 772 } 773 return 0; 774} 775 776struct io_context; /* See blkdev.h */ 777#define NGROUPS_SMALL 32 778#define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) 779struct group_info { 780 int ngroups; 781 atomic_t usage; 782 gid_t small_block[NGROUPS_SMALL]; 783 int nblocks; 784 gid_t *blocks[0]; 785}; 786 787/* 788 * get_group_info() must be called with the owning task locked (via task_lock()) 789 * when task != current. The reason being that the vast majority of callers are 790 * looking at current->group_info, which can not be changed except by the 791 * current task. Changing current->group_info requires the task lock, too. 792 */ 793#define get_group_info(group_info) do { \ 794 atomic_inc(&(group_info)->usage); \ 795} while (0) 796 797#define put_group_info(group_info) do { \ 798 if (atomic_dec_and_test(&(group_info)->usage)) \ 799 groups_free(group_info); \ 800} while (0) 801 802extern struct group_info *groups_alloc(int gidsetsize); 803extern void groups_free(struct group_info *group_info); 804extern int set_current_groups(struct group_info *group_info); 805extern int groups_search(struct group_info *group_info, gid_t grp); 806/* access the groups "array" with this macro */ 807#define GROUP_AT(gi, i) \ 808 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) 809 810#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 811extern void prefetch_stack(struct task_struct *t); 812#else 813static inline void prefetch_stack(struct task_struct *t) { } 814#endif 815 816struct audit_context; /* See audit.c */ 817struct mempolicy; 818struct pipe_inode_info; 819struct uts_namespace; 820 821struct rq; 822struct sched_domain; 823 824struct sched_class { 825 const struct sched_class *next; 826 827 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); 828 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); 829 void (*yield_task) (struct rq *rq); 830 int (*select_task_rq)(struct task_struct *p, int sync); 831 832 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p); 833 834 struct task_struct * (*pick_next_task) (struct rq *rq); 835 void (*put_prev_task) (struct rq *rq, struct task_struct *p); 836 837#ifdef CONFIG_SMP 838 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, 839 struct rq *busiest, unsigned long max_load_move, 840 struct sched_domain *sd, enum cpu_idle_type idle, 841 int *all_pinned, int *this_best_prio); 842 843 int (*move_one_task) (struct rq *this_rq, int this_cpu, 844 struct rq *busiest, struct sched_domain *sd, 845 enum cpu_idle_type idle); 846 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); 847 void (*post_schedule) (struct rq *this_rq); 848 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task); 849#endif 850 851 void (*set_curr_task) (struct rq *rq); 852 void (*task_tick) (struct rq *rq, struct task_struct *p); 853 void (*task_new) (struct rq *rq, struct task_struct *p); 854 void (*set_cpus_allowed)(struct task_struct *p, cpumask_t *newmask); 855 856 void (*join_domain)(struct rq *rq); 857 void (*leave_domain)(struct rq *rq); 858 859 void (*switched_from) (struct rq *this_rq, struct task_struct *task, 860 int running); 861 void (*switched_to) (struct rq *this_rq, struct task_struct *task, 862 int running); 863 void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 864 int oldprio, int running); 865}; 866 867struct load_weight { 868 unsigned long weight, inv_weight; 869}; 870 871/* 872 * CFS stats for a schedulable entity (task, task-group etc) 873 * 874 * Current field usage histogram: 875 * 876 * 4 se->block_start 877 * 4 se->run_node 878 * 4 se->sleep_start 879 * 6 se->load.weight 880 */ 881struct sched_entity { 882 struct load_weight load; /* for load-balancing */ 883 struct rb_node run_node; 884 unsigned int on_rq; 885 886 u64 exec_start; 887 u64 sum_exec_runtime; 888 u64 vruntime; 889 u64 prev_sum_exec_runtime; 890 891#ifdef CONFIG_SCHEDSTATS 892 u64 wait_start; 893 u64 wait_max; 894 895 u64 sleep_start; 896 u64 sleep_max; 897 s64 sum_sleep_runtime; 898 899 u64 block_start; 900 u64 block_max; 901 u64 exec_max; 902 u64 slice_max; 903 904 u64 nr_migrations; 905 u64 nr_migrations_cold; 906 u64 nr_failed_migrations_affine; 907 u64 nr_failed_migrations_running; 908 u64 nr_failed_migrations_hot; 909 u64 nr_forced_migrations; 910 u64 nr_forced2_migrations; 911 912 u64 nr_wakeups; 913 u64 nr_wakeups_sync; 914 u64 nr_wakeups_migrate; 915 u64 nr_wakeups_local; 916 u64 nr_wakeups_remote; 917 u64 nr_wakeups_affine; 918 u64 nr_wakeups_affine_attempts; 919 u64 nr_wakeups_passive; 920 u64 nr_wakeups_idle; 921#endif 922 923#ifdef CONFIG_FAIR_GROUP_SCHED 924 struct sched_entity *parent; 925 /* rq on which this entity is (to be) queued: */ 926 struct cfs_rq *cfs_rq; 927 /* rq "owned" by this entity/group: */ 928 struct cfs_rq *my_q; 929#endif 930}; 931 932struct sched_rt_entity { 933 struct list_head run_list; 934 unsigned int time_slice; 935 unsigned long timeout; 936}; 937 938struct task_struct { 939 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 940 void *stack; 941 atomic_t usage; 942 unsigned int flags; /* per process flags, defined below */ 943 unsigned int ptrace; 944 945 int lock_depth; /* BKL lock depth */ 946 947#ifdef CONFIG_SMP 948#ifdef __ARCH_WANT_UNLOCKED_CTXSW 949 int oncpu; 950#endif 951#endif 952 953 int prio, static_prio, normal_prio; 954 const struct sched_class *sched_class; 955 struct sched_entity se; 956 struct sched_rt_entity rt; 957 958#ifdef CONFIG_PREEMPT_NOTIFIERS 959 /* list of struct preempt_notifier: */ 960 struct hlist_head preempt_notifiers; 961#endif 962 963 unsigned short ioprio; 964 /* 965 * fpu_counter contains the number of consecutive context switches 966 * that the FPU is used. If this is over a threshold, the lazy fpu 967 * saving becomes unlazy to save the trap. This is an unsigned char 968 * so that after 256 times the counter wraps and the behavior turns 969 * lazy again; this to deal with bursty apps that only use FPU for 970 * a short time 971 */ 972 unsigned char fpu_counter; 973 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ 974#ifdef CONFIG_BLK_DEV_IO_TRACE 975 unsigned int btrace_seq; 976#endif 977 978 unsigned int policy; 979 cpumask_t cpus_allowed; 980 int nr_cpus_allowed; 981 982#ifdef CONFIG_PREEMPT_RCU 983 int rcu_read_lock_nesting; 984 int rcu_flipctr_idx; 985#endif /* #ifdef CONFIG_PREEMPT_RCU */ 986 987#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 988 struct sched_info sched_info; 989#endif 990 991 struct list_head tasks; 992 /* 993 * ptrace_list/ptrace_children forms the list of my children 994 * that were stolen by a ptracer. 995 */ 996 struct list_head ptrace_children; 997 struct list_head ptrace_list; 998 999 struct mm_struct *mm, *active_mm; 1000 1001/* task state */ 1002 struct linux_binfmt *binfmt; 1003 int exit_state; 1004 int exit_code, exit_signal; 1005 int pdeath_signal; /* The signal sent when the parent dies */ 1006 /* ??? */ 1007 unsigned int personality; 1008 unsigned did_exec:1; 1009 pid_t pid; 1010 pid_t tgid; 1011 1012#ifdef CONFIG_CC_STACKPROTECTOR 1013 /* Canary value for the -fstack-protector gcc feature */ 1014 unsigned long stack_canary; 1015#endif 1016 /* 1017 * pointers to (original) parent process, youngest child, younger sibling, 1018 * older sibling, respectively. (p->father can be replaced with 1019 * p->parent->pid) 1020 */ 1021 struct task_struct *real_parent; /* real parent process (when being debugged) */ 1022 struct task_struct *parent; /* parent process */ 1023 /* 1024 * children/sibling forms the list of my children plus the 1025 * tasks I'm ptracing. 1026 */ 1027 struct list_head children; /* list of my children */ 1028 struct list_head sibling; /* linkage in my parent's children list */ 1029 struct task_struct *group_leader; /* threadgroup leader */ 1030 1031 /* PID/PID hash table linkage. */ 1032 struct pid_link pids[PIDTYPE_MAX]; 1033 struct list_head thread_group; 1034 1035 struct completion *vfork_done; /* for vfork() */ 1036 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1037 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1038 1039 unsigned int rt_priority; 1040 cputime_t utime, stime, utimescaled, stimescaled; 1041 cputime_t gtime; 1042 cputime_t prev_utime, prev_stime; 1043 unsigned long nvcsw, nivcsw; /* context switch counts */ 1044 struct timespec start_time; /* monotonic time */ 1045 struct timespec real_start_time; /* boot based time */ 1046/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1047 unsigned long min_flt, maj_flt; 1048 1049 cputime_t it_prof_expires, it_virt_expires; 1050 unsigned long long it_sched_expires; 1051 struct list_head cpu_timers[3]; 1052 1053/* process credentials */ 1054 uid_t uid,euid,suid,fsuid; 1055 gid_t gid,egid,sgid,fsgid; 1056 struct group_info *group_info; 1057 kernel_cap_t cap_effective, cap_inheritable, cap_permitted; 1058 unsigned keep_capabilities:1; 1059 struct user_struct *user; 1060#ifdef CONFIG_KEYS 1061 struct key *request_key_auth; /* assumed request_key authority */ 1062 struct key *thread_keyring; /* keyring private to this thread */ 1063 unsigned char jit_keyring; /* default keyring to attach requested keys to */ 1064#endif 1065 char comm[TASK_COMM_LEN]; /* executable name excluding path 1066 - access with [gs]et_task_comm (which lock 1067 it with task_lock()) 1068 - initialized normally by flush_old_exec */ 1069/* file system info */ 1070 int link_count, total_link_count; 1071#ifdef CONFIG_SYSVIPC 1072/* ipc stuff */ 1073 struct sysv_sem sysvsem; 1074#endif 1075#ifdef CONFIG_DETECT_SOFTLOCKUP 1076/* hung task detection */ 1077 unsigned long last_switch_timestamp; 1078 unsigned long last_switch_count; 1079#endif 1080/* CPU-specific state of this task */ 1081 struct thread_struct thread; 1082/* filesystem information */ 1083 struct fs_struct *fs; 1084/* open file information */ 1085 struct files_struct *files; 1086/* namespaces */ 1087 struct nsproxy *nsproxy; 1088/* signal handlers */ 1089 struct signal_struct *signal; 1090 struct sighand_struct *sighand; 1091 1092 sigset_t blocked, real_blocked; 1093 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */ 1094 struct sigpending pending; 1095 1096 unsigned long sas_ss_sp; 1097 size_t sas_ss_size; 1098 int (*notifier)(void *priv); 1099 void *notifier_data; 1100 sigset_t *notifier_mask; 1101#ifdef CONFIG_SECURITY 1102 void *security; 1103#endif 1104 struct audit_context *audit_context; 1105 seccomp_t seccomp; 1106 1107/* Thread group tracking */ 1108 u32 parent_exec_id; 1109 u32 self_exec_id; 1110/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 1111 spinlock_t alloc_lock; 1112 1113 /* Protection of the PI data structures: */ 1114 spinlock_t pi_lock; 1115 1116#ifdef CONFIG_RT_MUTEXES 1117 /* PI waiters blocked on a rt_mutex held by this task */ 1118 struct plist_head pi_waiters; 1119 /* Deadlock detection and priority inheritance handling */ 1120 struct rt_mutex_waiter *pi_blocked_on; 1121#endif 1122 1123#ifdef CONFIG_DEBUG_MUTEXES 1124 /* mutex deadlock detection */ 1125 struct mutex_waiter *blocked_on; 1126#endif 1127#ifdef CONFIG_TRACE_IRQFLAGS 1128 unsigned int irq_events; 1129 int hardirqs_enabled; 1130 unsigned long hardirq_enable_ip; 1131 unsigned int hardirq_enable_event; 1132 unsigned long hardirq_disable_ip; 1133 unsigned int hardirq_disable_event; 1134 int softirqs_enabled; 1135 unsigned long softirq_disable_ip; 1136 unsigned int softirq_disable_event; 1137 unsigned long softirq_enable_ip; 1138 unsigned int softirq_enable_event; 1139 int hardirq_context; 1140 int softirq_context; 1141#endif 1142#ifdef CONFIG_LOCKDEP 1143# define MAX_LOCK_DEPTH 30UL 1144 u64 curr_chain_key; 1145 int lockdep_depth; 1146 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1147 unsigned int lockdep_recursion; 1148#endif 1149 1150/* journalling filesystem info */ 1151 void *journal_info; 1152 1153/* stacked block device info */ 1154 struct bio *bio_list, **bio_tail; 1155 1156/* VM state */ 1157 struct reclaim_state *reclaim_state; 1158 1159 struct backing_dev_info *backing_dev_info; 1160 1161 struct io_context *io_context; 1162 1163 unsigned long ptrace_message; 1164 siginfo_t *last_siginfo; /* For ptrace use. */ 1165#ifdef CONFIG_TASK_XACCT 1166/* i/o counters(bytes read/written, #syscalls */ 1167 u64 rchar, wchar, syscr, syscw; 1168#endif 1169 struct task_io_accounting ioac; 1170#if defined(CONFIG_TASK_XACCT) 1171 u64 acct_rss_mem1; /* accumulated rss usage */ 1172 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1173 cputime_t acct_stimexpd;/* stime since last update */ 1174#endif 1175#ifdef CONFIG_NUMA 1176 struct mempolicy *mempolicy; 1177 short il_next; 1178#endif 1179#ifdef CONFIG_CPUSETS 1180 nodemask_t mems_allowed; 1181 int cpuset_mems_generation; 1182 int cpuset_mem_spread_rotor; 1183#endif 1184#ifdef CONFIG_CGROUPS 1185 /* Control Group info protected by css_set_lock */ 1186 struct css_set *cgroups; 1187 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1188 struct list_head cg_list; 1189#endif 1190#ifdef CONFIG_FUTEX 1191 struct robust_list_head __user *robust_list; 1192#ifdef CONFIG_COMPAT 1193 struct compat_robust_list_head __user *compat_robust_list; 1194#endif 1195 struct list_head pi_state_list; 1196 struct futex_pi_state *pi_state_cache; 1197#endif 1198 atomic_t fs_excl; /* holding fs exclusive resources */ 1199 struct rcu_head rcu; 1200 1201 /* 1202 * cache last used pipe for splice 1203 */ 1204 struct pipe_inode_info *splice_pipe; 1205#ifdef CONFIG_TASK_DELAY_ACCT 1206 struct task_delay_info *delays; 1207#endif 1208#ifdef CONFIG_FAULT_INJECTION 1209 int make_it_fail; 1210#endif 1211 struct prop_local_single dirties; 1212}; 1213 1214/* 1215 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1216 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1217 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1218 * values are inverted: lower p->prio value means higher priority. 1219 * 1220 * The MAX_USER_RT_PRIO value allows the actual maximum 1221 * RT priority to be separate from the value exported to 1222 * user-space. This allows kernel threads to set their 1223 * priority to a value higher than any user task. Note: 1224 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1225 */ 1226 1227#define MAX_USER_RT_PRIO 100 1228#define MAX_RT_PRIO MAX_USER_RT_PRIO 1229 1230#define MAX_PRIO (MAX_RT_PRIO + 40) 1231#define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1232 1233static inline int rt_prio(int prio) 1234{ 1235 if (unlikely(prio < MAX_RT_PRIO)) 1236 return 1; 1237 return 0; 1238} 1239 1240static inline int rt_task(struct task_struct *p) 1241{ 1242 return rt_prio(p->prio); 1243} 1244 1245static inline void set_task_session(struct task_struct *tsk, pid_t session) 1246{ 1247 tsk->signal->__session = session; 1248} 1249 1250static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp) 1251{ 1252 tsk->signal->__pgrp = pgrp; 1253} 1254 1255static inline struct pid *task_pid(struct task_struct *task) 1256{ 1257 return task->pids[PIDTYPE_PID].pid; 1258} 1259 1260static inline struct pid *task_tgid(struct task_struct *task) 1261{ 1262 return task->group_leader->pids[PIDTYPE_PID].pid; 1263} 1264 1265static inline struct pid *task_pgrp(struct task_struct *task) 1266{ 1267 return task->group_leader->pids[PIDTYPE_PGID].pid; 1268} 1269 1270static inline struct pid *task_session(struct task_struct *task) 1271{ 1272 return task->group_leader->pids[PIDTYPE_SID].pid; 1273} 1274 1275struct pid_namespace; 1276 1277/* 1278 * the helpers to get the task's different pids as they are seen 1279 * from various namespaces 1280 * 1281 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1282 * task_xid_vnr() : virtual id, i.e. the id seen from the namespace the task 1283 * belongs to. this only makes sence when called in the 1284 * context of the task that belongs to the same namespace; 1285 * task_xid_nr_ns() : id seen from the ns specified; 1286 * 1287 * set_task_vxid() : assigns a virtual id to a task; 1288 * 1289 * see also pid_nr() etc in include/linux/pid.h 1290 */ 1291 1292static inline pid_t task_pid_nr(struct task_struct *tsk) 1293{ 1294 return tsk->pid; 1295} 1296 1297pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1298 1299static inline pid_t task_pid_vnr(struct task_struct *tsk) 1300{ 1301 return pid_vnr(task_pid(tsk)); 1302} 1303 1304 1305static inline pid_t task_tgid_nr(struct task_struct *tsk) 1306{ 1307 return tsk->tgid; 1308} 1309 1310pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1311 1312static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1313{ 1314 return pid_vnr(task_tgid(tsk)); 1315} 1316 1317 1318static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1319{ 1320 return tsk->signal->__pgrp; 1321} 1322 1323pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1324 1325static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1326{ 1327 return pid_vnr(task_pgrp(tsk)); 1328} 1329 1330 1331static inline pid_t task_session_nr(struct task_struct *tsk) 1332{ 1333 return tsk->signal->__session; 1334} 1335 1336pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1337 1338static inline pid_t task_session_vnr(struct task_struct *tsk) 1339{ 1340 return pid_vnr(task_session(tsk)); 1341} 1342 1343 1344/** 1345 * pid_alive - check that a task structure is not stale 1346 * @p: Task structure to be checked. 1347 * 1348 * Test if a process is not yet dead (at most zombie state) 1349 * If pid_alive fails, then pointers within the task structure 1350 * can be stale and must not be dereferenced. 1351 */ 1352static inline int pid_alive(struct task_struct *p) 1353{ 1354 return p->pids[PIDTYPE_PID].pid != NULL; 1355} 1356 1357/** 1358 * is_global_init - check if a task structure is init 1359 * @tsk: Task structure to be checked. 1360 * 1361 * Check if a task structure is the first user space task the kernel created. 1362 */ 1363static inline int is_global_init(struct task_struct *tsk) 1364{ 1365 return tsk->pid == 1; 1366} 1367 1368/* 1369 * is_container_init: 1370 * check whether in the task is init in its own pid namespace. 1371 */ 1372extern int is_container_init(struct task_struct *tsk); 1373 1374extern struct pid *cad_pid; 1375 1376extern void free_task(struct task_struct *tsk); 1377#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1378 1379extern void __put_task_struct(struct task_struct *t); 1380 1381static inline void put_task_struct(struct task_struct *t) 1382{ 1383 if (atomic_dec_and_test(&t->usage)) 1384 __put_task_struct(t); 1385} 1386 1387/* 1388 * Per process flags 1389 */ 1390#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 1391 /* Not implemented yet, only for 486*/ 1392#define PF_STARTING 0x00000002 /* being created */ 1393#define PF_EXITING 0x00000004 /* getting shut down */ 1394#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1395#define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1396#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1397#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1398#define PF_DUMPCORE 0x00000200 /* dumped core */ 1399#define PF_SIGNALED 0x00000400 /* killed by a signal */ 1400#define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1401#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 1402#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1403#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1404#define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1405#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1406#define PF_KSWAPD 0x00040000 /* I am kswapd */ 1407#define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 1408#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1409#define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */ 1410#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1411#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1412#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1413#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1414#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1415#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1416#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1417 1418/* 1419 * Only the _current_ task can read/write to tsk->flags, but other 1420 * tasks can access tsk->flags in readonly mode for example 1421 * with tsk_used_math (like during threaded core dumping). 1422 * There is however an exception to this rule during ptrace 1423 * or during fork: the ptracer task is allowed to write to the 1424 * child->flags of its traced child (same goes for fork, the parent 1425 * can write to the child->flags), because we're guaranteed the 1426 * child is not running and in turn not changing child->flags 1427 * at the same time the parent does it. 1428 */ 1429#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1430#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1431#define clear_used_math() clear_stopped_child_used_math(current) 1432#define set_used_math() set_stopped_child_used_math(current) 1433#define conditional_stopped_child_used_math(condition, child) \ 1434 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1435#define conditional_used_math(condition) \ 1436 conditional_stopped_child_used_math(condition, current) 1437#define copy_to_stopped_child_used_math(child) \ 1438 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1439/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1440#define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1441#define used_math() tsk_used_math(current) 1442 1443#ifdef CONFIG_SMP 1444extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask); 1445#else 1446static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1447{ 1448 if (!cpu_isset(0, new_mask)) 1449 return -EINVAL; 1450 return 0; 1451} 1452#endif 1453 1454extern unsigned long long sched_clock(void); 1455 1456/* 1457 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1458 * clock constructed from sched_clock(): 1459 */ 1460extern unsigned long long cpu_clock(int cpu); 1461 1462extern unsigned long long 1463task_sched_runtime(struct task_struct *task); 1464 1465/* sched_exec is called by processes performing an exec */ 1466#ifdef CONFIG_SMP 1467extern void sched_exec(void); 1468#else 1469#define sched_exec() {} 1470#endif 1471 1472extern void sched_clock_idle_sleep_event(void); 1473extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1474 1475#ifdef CONFIG_HOTPLUG_CPU 1476extern void idle_task_exit(void); 1477#else 1478static inline void idle_task_exit(void) {} 1479#endif 1480 1481extern void sched_idle_next(void); 1482 1483#ifdef CONFIG_SCHED_DEBUG 1484extern unsigned int sysctl_sched_latency; 1485extern unsigned int sysctl_sched_min_granularity; 1486extern unsigned int sysctl_sched_wakeup_granularity; 1487extern unsigned int sysctl_sched_batch_wakeup_granularity; 1488extern unsigned int sysctl_sched_child_runs_first; 1489extern unsigned int sysctl_sched_features; 1490extern unsigned int sysctl_sched_migration_cost; 1491extern unsigned int sysctl_sched_nr_migrate; 1492#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP) 1493extern unsigned int sysctl_sched_min_bal_int_shares; 1494extern unsigned int sysctl_sched_max_bal_int_shares; 1495#endif 1496 1497int sched_nr_latency_handler(struct ctl_table *table, int write, 1498 struct file *file, void __user *buffer, size_t *length, 1499 loff_t *ppos); 1500#endif 1501 1502extern unsigned int sysctl_sched_compat_yield; 1503 1504#ifdef CONFIG_RT_MUTEXES 1505extern int rt_mutex_getprio(struct task_struct *p); 1506extern void rt_mutex_setprio(struct task_struct *p, int prio); 1507extern void rt_mutex_adjust_pi(struct task_struct *p); 1508#else 1509static inline int rt_mutex_getprio(struct task_struct *p) 1510{ 1511 return p->normal_prio; 1512} 1513# define rt_mutex_adjust_pi(p) do { } while (0) 1514#endif 1515 1516extern void set_user_nice(struct task_struct *p, long nice); 1517extern int task_prio(const struct task_struct *p); 1518extern int task_nice(const struct task_struct *p); 1519extern int can_nice(const struct task_struct *p, const int nice); 1520extern int task_curr(const struct task_struct *p); 1521extern int idle_cpu(int cpu); 1522extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1523extern struct task_struct *idle_task(int cpu); 1524extern struct task_struct *curr_task(int cpu); 1525extern void set_curr_task(int cpu, struct task_struct *p); 1526 1527void yield(void); 1528 1529/* 1530 * The default (Linux) execution domain. 1531 */ 1532extern struct exec_domain default_exec_domain; 1533 1534union thread_union { 1535 struct thread_info thread_info; 1536 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1537}; 1538 1539#ifndef __HAVE_ARCH_KSTACK_END 1540static inline int kstack_end(void *addr) 1541{ 1542 /* Reliable end of stack detection: 1543 * Some APM bios versions misalign the stack 1544 */ 1545 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1546} 1547#endif 1548 1549extern union thread_union init_thread_union; 1550extern struct task_struct init_task; 1551 1552extern struct mm_struct init_mm; 1553 1554extern struct pid_namespace init_pid_ns; 1555 1556/* 1557 * find a task by one of its numerical ids 1558 * 1559 * find_task_by_pid_type_ns(): 1560 * it is the most generic call - it finds a task by all id, 1561 * type and namespace specified 1562 * find_task_by_pid_ns(): 1563 * finds a task by its pid in the specified namespace 1564 * find_task_by_vpid(): 1565 * finds a task by its virtual pid 1566 * find_task_by_pid(): 1567 * finds a task by its global pid 1568 * 1569 * see also find_pid() etc in include/linux/pid.h 1570 */ 1571 1572extern struct task_struct *find_task_by_pid_type_ns(int type, int pid, 1573 struct pid_namespace *ns); 1574 1575extern struct task_struct *find_task_by_pid(pid_t nr); 1576extern struct task_struct *find_task_by_vpid(pid_t nr); 1577extern struct task_struct *find_task_by_pid_ns(pid_t nr, 1578 struct pid_namespace *ns); 1579 1580extern void __set_special_pids(pid_t session, pid_t pgrp); 1581 1582/* per-UID process charging. */ 1583extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 1584static inline struct user_struct *get_uid(struct user_struct *u) 1585{ 1586 atomic_inc(&u->__count); 1587 return u; 1588} 1589extern void free_uid(struct user_struct *); 1590extern void switch_uid(struct user_struct *); 1591extern void release_uids(struct user_namespace *ns); 1592 1593#include <asm/current.h> 1594 1595extern void do_timer(unsigned long ticks); 1596 1597extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); 1598extern int FASTCALL(wake_up_process(struct task_struct * tsk)); 1599extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, 1600 unsigned long clone_flags)); 1601#ifdef CONFIG_SMP 1602 extern void kick_process(struct task_struct *tsk); 1603#else 1604 static inline void kick_process(struct task_struct *tsk) { } 1605#endif 1606extern void sched_fork(struct task_struct *p, int clone_flags); 1607extern void sched_dead(struct task_struct *p); 1608 1609extern int in_group_p(gid_t); 1610extern int in_egroup_p(gid_t); 1611 1612extern void proc_caches_init(void); 1613extern void flush_signals(struct task_struct *); 1614extern void ignore_signals(struct task_struct *); 1615extern void flush_signal_handlers(struct task_struct *, int force_default); 1616extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 1617 1618static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 1619{ 1620 unsigned long flags; 1621 int ret; 1622 1623 spin_lock_irqsave(&tsk->sighand->siglock, flags); 1624 ret = dequeue_signal(tsk, mask, info); 1625 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 1626 1627 return ret; 1628} 1629 1630extern void block_all_signals(int (*notifier)(void *priv), void *priv, 1631 sigset_t *mask); 1632extern void unblock_all_signals(void); 1633extern void release_task(struct task_struct * p); 1634extern int send_sig_info(int, struct siginfo *, struct task_struct *); 1635extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); 1636extern int force_sigsegv(int, struct task_struct *); 1637extern int force_sig_info(int, struct siginfo *, struct task_struct *); 1638extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1639extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1640extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 1641extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 1642extern int kill_pgrp(struct pid *pid, int sig, int priv); 1643extern int kill_pid(struct pid *pid, int sig, int priv); 1644extern int kill_proc_info(int, struct siginfo *, pid_t); 1645extern void do_notify_parent(struct task_struct *, int); 1646extern void force_sig(int, struct task_struct *); 1647extern void force_sig_specific(int, struct task_struct *); 1648extern int send_sig(int, struct task_struct *, int); 1649extern void zap_other_threads(struct task_struct *p); 1650extern int kill_proc(pid_t, int, int); 1651extern struct sigqueue *sigqueue_alloc(void); 1652extern void sigqueue_free(struct sigqueue *); 1653extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); 1654extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); 1655extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 1656extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 1657 1658static inline int kill_cad_pid(int sig, int priv) 1659{ 1660 return kill_pid(cad_pid, sig, priv); 1661} 1662 1663/* These can be the second arg to send_sig_info/send_group_sig_info. */ 1664#define SEND_SIG_NOINFO ((struct siginfo *) 0) 1665#define SEND_SIG_PRIV ((struct siginfo *) 1) 1666#define SEND_SIG_FORCED ((struct siginfo *) 2) 1667 1668static inline int is_si_special(const struct siginfo *info) 1669{ 1670 return info <= SEND_SIG_FORCED; 1671} 1672 1673/* True if we are on the alternate signal stack. */ 1674 1675static inline int on_sig_stack(unsigned long sp) 1676{ 1677 return (sp - current->sas_ss_sp < current->sas_ss_size); 1678} 1679 1680static inline int sas_ss_flags(unsigned long sp) 1681{ 1682 return (current->sas_ss_size == 0 ? SS_DISABLE 1683 : on_sig_stack(sp) ? SS_ONSTACK : 0); 1684} 1685 1686/* 1687 * Routines for handling mm_structs 1688 */ 1689extern struct mm_struct * mm_alloc(void); 1690 1691/* mmdrop drops the mm and the page tables */ 1692extern void FASTCALL(__mmdrop(struct mm_struct *)); 1693static inline void mmdrop(struct mm_struct * mm) 1694{ 1695 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 1696 __mmdrop(mm); 1697} 1698 1699/* mmput gets rid of the mappings and all user-space */ 1700extern void mmput(struct mm_struct *); 1701/* Grab a reference to a task's mm, if it is not already going away */ 1702extern struct mm_struct *get_task_mm(struct task_struct *task); 1703/* Remove the current tasks stale references to the old mm_struct */ 1704extern void mm_release(struct task_struct *, struct mm_struct *); 1705 1706extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 1707extern void flush_thread(void); 1708extern void exit_thread(void); 1709 1710extern void exit_files(struct task_struct *); 1711extern void __cleanup_signal(struct signal_struct *); 1712extern void __cleanup_sighand(struct sighand_struct *); 1713extern void exit_itimers(struct signal_struct *); 1714 1715extern NORET_TYPE void do_group_exit(int); 1716 1717extern void daemonize(const char *, ...); 1718extern int allow_signal(int); 1719extern int disallow_signal(int); 1720 1721extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 1722extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 1723struct task_struct *fork_idle(int); 1724 1725extern void set_task_comm(struct task_struct *tsk, char *from); 1726extern void get_task_comm(char *to, struct task_struct *tsk); 1727 1728#ifdef CONFIG_SMP 1729extern void wait_task_inactive(struct task_struct * p); 1730#else 1731#define wait_task_inactive(p) do { } while (0) 1732#endif 1733 1734#define remove_parent(p) list_del_init(&(p)->sibling) 1735#define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children) 1736 1737#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) 1738 1739#define for_each_process(p) \ 1740 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 1741 1742/* 1743 * Careful: do_each_thread/while_each_thread is a double loop so 1744 * 'break' will not work as expected - use goto instead. 1745 */ 1746#define do_each_thread(g, t) \ 1747 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 1748 1749#define while_each_thread(g, t) \ 1750 while ((t = next_thread(t)) != g) 1751 1752/* de_thread depends on thread_group_leader not being a pid based check */ 1753#define thread_group_leader(p) (p == p->group_leader) 1754 1755/* Do to the insanities of de_thread it is possible for a process 1756 * to have the pid of the thread group leader without actually being 1757 * the thread group leader. For iteration through the pids in proc 1758 * all we care about is that we have a task with the appropriate 1759 * pid, we don't actually care if we have the right task. 1760 */ 1761static inline int has_group_leader_pid(struct task_struct *p) 1762{ 1763 return p->pid == p->tgid; 1764} 1765 1766static inline 1767int same_thread_group(struct task_struct *p1, struct task_struct *p2) 1768{ 1769 return p1->tgid == p2->tgid; 1770} 1771 1772static inline struct task_struct *next_thread(const struct task_struct *p) 1773{ 1774 return list_entry(rcu_dereference(p->thread_group.next), 1775 struct task_struct, thread_group); 1776} 1777 1778static inline int thread_group_empty(struct task_struct *p) 1779{ 1780 return list_empty(&p->thread_group); 1781} 1782 1783#define delay_group_leader(p) \ 1784 (thread_group_leader(p) && !thread_group_empty(p)) 1785 1786/* 1787 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 1788 * subscriptions and synchronises with wait4(). Also used in procfs. Also 1789 * pins the final release of task.io_context. Also protects ->cpuset and 1790 * ->cgroup.subsys[]. 1791 * 1792 * Nests both inside and outside of read_lock(&tasklist_lock). 1793 * It must not be nested with write_lock_irq(&tasklist_lock), 1794 * neither inside nor outside. 1795 */ 1796static inline void task_lock(struct task_struct *p) 1797{ 1798 spin_lock(&p->alloc_lock); 1799} 1800 1801static inline void task_unlock(struct task_struct *p) 1802{ 1803 spin_unlock(&p->alloc_lock); 1804} 1805 1806extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 1807 unsigned long *flags); 1808 1809static inline void unlock_task_sighand(struct task_struct *tsk, 1810 unsigned long *flags) 1811{ 1812 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 1813} 1814 1815#ifndef __HAVE_THREAD_FUNCTIONS 1816 1817#define task_thread_info(task) ((struct thread_info *)(task)->stack) 1818#define task_stack_page(task) ((task)->stack) 1819 1820static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 1821{ 1822 *task_thread_info(p) = *task_thread_info(org); 1823 task_thread_info(p)->task = p; 1824} 1825 1826static inline unsigned long *end_of_stack(struct task_struct *p) 1827{ 1828 return (unsigned long *)(task_thread_info(p) + 1); 1829} 1830 1831#endif 1832 1833/* set thread flags in other task's structures 1834 * - see asm/thread_info.h for TIF_xxxx flags available 1835 */ 1836static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 1837{ 1838 set_ti_thread_flag(task_thread_info(tsk), flag); 1839} 1840 1841static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1842{ 1843 clear_ti_thread_flag(task_thread_info(tsk), flag); 1844} 1845 1846static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 1847{ 1848 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 1849} 1850 1851static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1852{ 1853 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 1854} 1855 1856static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 1857{ 1858 return test_ti_thread_flag(task_thread_info(tsk), flag); 1859} 1860 1861static inline void set_tsk_need_resched(struct task_struct *tsk) 1862{ 1863 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1864} 1865 1866static inline void clear_tsk_need_resched(struct task_struct *tsk) 1867{ 1868 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1869} 1870 1871static inline int signal_pending(struct task_struct *p) 1872{ 1873 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 1874} 1875 1876static inline int need_resched(void) 1877{ 1878 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 1879} 1880 1881/* 1882 * cond_resched() and cond_resched_lock(): latency reduction via 1883 * explicit rescheduling in places that are safe. The return 1884 * value indicates whether a reschedule was done in fact. 1885 * cond_resched_lock() will drop the spinlock before scheduling, 1886 * cond_resched_softirq() will enable bhs before scheduling. 1887 */ 1888extern int cond_resched(void); 1889extern int cond_resched_lock(spinlock_t * lock); 1890extern int cond_resched_softirq(void); 1891 1892/* 1893 * Does a critical section need to be broken due to another 1894 * task waiting?: 1895 */ 1896#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) 1897# define need_lockbreak(lock) ((lock)->break_lock) 1898#else 1899# define need_lockbreak(lock) 0 1900#endif 1901 1902/* 1903 * Does a critical section need to be broken due to another 1904 * task waiting or preemption being signalled: 1905 */ 1906static inline int lock_need_resched(spinlock_t *lock) 1907{ 1908 if (need_lockbreak(lock) || need_resched()) 1909 return 1; 1910 return 0; 1911} 1912 1913/* 1914 * Reevaluate whether the task has signals pending delivery. 1915 * Wake the task if so. 1916 * This is required every time the blocked sigset_t changes. 1917 * callers must hold sighand->siglock. 1918 */ 1919extern void recalc_sigpending_and_wake(struct task_struct *t); 1920extern void recalc_sigpending(void); 1921 1922extern void signal_wake_up(struct task_struct *t, int resume_stopped); 1923 1924/* 1925 * Wrappers for p->thread_info->cpu access. No-op on UP. 1926 */ 1927#ifdef CONFIG_SMP 1928 1929static inline unsigned int task_cpu(const struct task_struct *p) 1930{ 1931 return task_thread_info(p)->cpu; 1932} 1933 1934extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 1935 1936#else 1937 1938static inline unsigned int task_cpu(const struct task_struct *p) 1939{ 1940 return 0; 1941} 1942 1943static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 1944{ 1945} 1946 1947#endif /* CONFIG_SMP */ 1948 1949#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1950extern void arch_pick_mmap_layout(struct mm_struct *mm); 1951#else 1952static inline void arch_pick_mmap_layout(struct mm_struct *mm) 1953{ 1954 mm->mmap_base = TASK_UNMAPPED_BASE; 1955 mm->get_unmapped_area = arch_get_unmapped_area; 1956 mm->unmap_area = arch_unmap_area; 1957} 1958#endif 1959 1960extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); 1961extern long sched_getaffinity(pid_t pid, cpumask_t *mask); 1962 1963extern int sched_mc_power_savings, sched_smt_power_savings; 1964 1965extern void normalize_rt_tasks(void); 1966 1967#ifdef CONFIG_FAIR_GROUP_SCHED 1968 1969extern struct task_group init_task_group; 1970 1971extern struct task_group *sched_create_group(void); 1972extern void sched_destroy_group(struct task_group *tg); 1973extern void sched_move_task(struct task_struct *tsk); 1974extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 1975extern unsigned long sched_group_shares(struct task_group *tg); 1976 1977#endif 1978 1979#ifdef CONFIG_TASK_XACCT 1980static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 1981{ 1982 tsk->rchar += amt; 1983} 1984 1985static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 1986{ 1987 tsk->wchar += amt; 1988} 1989 1990static inline void inc_syscr(struct task_struct *tsk) 1991{ 1992 tsk->syscr++; 1993} 1994 1995static inline void inc_syscw(struct task_struct *tsk) 1996{ 1997 tsk->syscw++; 1998} 1999#else 2000static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2001{ 2002} 2003 2004static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2005{ 2006} 2007 2008static inline void inc_syscr(struct task_struct *tsk) 2009{ 2010} 2011 2012static inline void inc_syscw(struct task_struct *tsk) 2013{ 2014} 2015#endif 2016 2017#ifdef CONFIG_SMP 2018void migration_init(void); 2019#else 2020static inline void migration_init(void) 2021{ 2022} 2023#endif 2024 2025#endif /* __KERNEL__ */ 2026 2027#endif 2028