sched.h revision 690cc3ffe33ac4a2857583c22d4c6244ae11684d
1#ifndef _LINUX_SCHED_H 2#define _LINUX_SCHED_H 3 4/* 5 * cloning flags: 6 */ 7#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ 8#define CLONE_VM 0x00000100 /* set if VM shared between processes */ 9#define CLONE_FS 0x00000200 /* set if fs info shared between processes */ 10#define CLONE_FILES 0x00000400 /* set if open files shared between processes */ 11#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ 12#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ 13#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ 14#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ 15#define CLONE_THREAD 0x00010000 /* Same thread group? */ 16#define CLONE_NEWNS 0x00020000 /* New namespace group? */ 17#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ 18#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ 19#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ 20#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ 21#define CLONE_DETACHED 0x00400000 /* Unused, ignored */ 22#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ 23#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ 24#define CLONE_STOPPED 0x02000000 /* Start in stopped state */ 25#define CLONE_NEWUTS 0x04000000 /* New utsname group? */ 26#define CLONE_NEWIPC 0x08000000 /* New ipcs */ 27#define CLONE_NEWUSER 0x10000000 /* New user namespace */ 28#define CLONE_NEWPID 0x20000000 /* New pid namespace */ 29#define CLONE_NEWNET 0x40000000 /* New network namespace */ 30#define CLONE_IO 0x80000000 /* Clone io context */ 31 32/* 33 * Scheduling policies 34 */ 35#define SCHED_NORMAL 0 36#define SCHED_FIFO 1 37#define SCHED_RR 2 38#define SCHED_BATCH 3 39/* SCHED_ISO: reserved but not implemented yet */ 40#define SCHED_IDLE 5 41 42#ifdef __KERNEL__ 43 44struct sched_param { 45 int sched_priority; 46}; 47 48#include <asm/param.h> /* for HZ */ 49 50#include <linux/capability.h> 51#include <linux/threads.h> 52#include <linux/kernel.h> 53#include <linux/types.h> 54#include <linux/timex.h> 55#include <linux/jiffies.h> 56#include <linux/rbtree.h> 57#include <linux/thread_info.h> 58#include <linux/cpumask.h> 59#include <linux/errno.h> 60#include <linux/nodemask.h> 61#include <linux/mm_types.h> 62 63#include <asm/system.h> 64#include <asm/page.h> 65#include <asm/ptrace.h> 66#include <asm/cputime.h> 67 68#include <linux/smp.h> 69#include <linux/sem.h> 70#include <linux/signal.h> 71#include <linux/path.h> 72#include <linux/compiler.h> 73#include <linux/completion.h> 74#include <linux/pid.h> 75#include <linux/percpu.h> 76#include <linux/topology.h> 77#include <linux/proportions.h> 78#include <linux/seccomp.h> 79#include <linux/rcupdate.h> 80#include <linux/rtmutex.h> 81 82#include <linux/time.h> 83#include <linux/param.h> 84#include <linux/resource.h> 85#include <linux/timer.h> 86#include <linux/hrtimer.h> 87#include <linux/task_io_accounting.h> 88#include <linux/kobject.h> 89#include <linux/latencytop.h> 90#include <linux/cred.h> 91 92#include <asm/processor.h> 93 94struct mem_cgroup; 95struct exec_domain; 96struct futex_pi_state; 97struct robust_list_head; 98struct bio; 99struct bts_tracer; 100struct fs_struct; 101 102/* 103 * List of flags we want to share for kernel threads, 104 * if only because they are not used by them anyway. 105 */ 106#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 107 108/* 109 * These are the constant used to fake the fixed-point load-average 110 * counting. Some notes: 111 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 112 * a load-average precision of 10 bits integer + 11 bits fractional 113 * - if you want to count load-averages more often, you need more 114 * precision, or rounding will get you. With 2-second counting freq, 115 * the EXP_n values would be 1981, 2034 and 2043 if still using only 116 * 11 bit fractions. 117 */ 118extern unsigned long avenrun[]; /* Load averages */ 119 120#define FSHIFT 11 /* nr of bits of precision */ 121#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 122#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ 123#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 124#define EXP_5 2014 /* 1/exp(5sec/5min) */ 125#define EXP_15 2037 /* 1/exp(5sec/15min) */ 126 127#define CALC_LOAD(load,exp,n) \ 128 load *= exp; \ 129 load += n*(FIXED_1-exp); \ 130 load >>= FSHIFT; 131 132extern unsigned long total_forks; 133extern int nr_threads; 134DECLARE_PER_CPU(unsigned long, process_counts); 135extern int nr_processes(void); 136extern unsigned long nr_running(void); 137extern unsigned long nr_uninterruptible(void); 138extern unsigned long nr_active(void); 139extern unsigned long nr_iowait(void); 140 141extern unsigned long get_parent_ip(unsigned long addr); 142 143struct seq_file; 144struct cfs_rq; 145struct task_group; 146#ifdef CONFIG_SCHED_DEBUG 147extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 148extern void proc_sched_set_task(struct task_struct *p); 149extern void 150print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 151#else 152static inline void 153proc_sched_show_task(struct task_struct *p, struct seq_file *m) 154{ 155} 156static inline void proc_sched_set_task(struct task_struct *p) 157{ 158} 159static inline void 160print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 161{ 162} 163#endif 164 165extern unsigned long long time_sync_thresh; 166 167/* 168 * Task state bitmask. NOTE! These bits are also 169 * encoded in fs/proc/array.c: get_task_state(). 170 * 171 * We have two separate sets of flags: task->state 172 * is about runnability, while task->exit_state are 173 * about the task exiting. Confusing, but this way 174 * modifying one set can't modify the other one by 175 * mistake. 176 */ 177#define TASK_RUNNING 0 178#define TASK_INTERRUPTIBLE 1 179#define TASK_UNINTERRUPTIBLE 2 180#define __TASK_STOPPED 4 181#define __TASK_TRACED 8 182/* in tsk->exit_state */ 183#define EXIT_ZOMBIE 16 184#define EXIT_DEAD 32 185/* in tsk->state again */ 186#define TASK_DEAD 64 187#define TASK_WAKEKILL 128 188 189/* Convenience macros for the sake of set_task_state */ 190#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) 191#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) 192#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) 193 194/* Convenience macros for the sake of wake_up */ 195#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 196#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) 197 198/* get_task_state() */ 199#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ 200 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ 201 __TASK_TRACED) 202 203#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) 204#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) 205#define task_is_stopped_or_traced(task) \ 206 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) 207#define task_contributes_to_load(task) \ 208 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ 209 (task->flags & PF_FROZEN) == 0) 210 211#define __set_task_state(tsk, state_value) \ 212 do { (tsk)->state = (state_value); } while (0) 213#define set_task_state(tsk, state_value) \ 214 set_mb((tsk)->state, (state_value)) 215 216/* 217 * set_current_state() includes a barrier so that the write of current->state 218 * is correctly serialised wrt the caller's subsequent test of whether to 219 * actually sleep: 220 * 221 * set_current_state(TASK_UNINTERRUPTIBLE); 222 * if (do_i_need_to_sleep()) 223 * schedule(); 224 * 225 * If the caller does not need such serialisation then use __set_current_state() 226 */ 227#define __set_current_state(state_value) \ 228 do { current->state = (state_value); } while (0) 229#define set_current_state(state_value) \ 230 set_mb(current->state, (state_value)) 231 232/* Task command name length */ 233#define TASK_COMM_LEN 16 234 235#include <linux/spinlock.h> 236 237/* 238 * This serializes "schedule()" and also protects 239 * the run-queue from deletions/modifications (but 240 * _adding_ to the beginning of the run-queue has 241 * a separate lock). 242 */ 243extern rwlock_t tasklist_lock; 244extern spinlock_t mmlist_lock; 245 246struct task_struct; 247 248extern void sched_init(void); 249extern void sched_init_smp(void); 250extern asmlinkage void schedule_tail(struct task_struct *prev); 251extern void init_idle(struct task_struct *idle, int cpu); 252extern void init_idle_bootup_task(struct task_struct *idle); 253 254extern int runqueue_is_locked(void); 255extern void task_rq_unlock_wait(struct task_struct *p); 256 257extern cpumask_var_t nohz_cpu_mask; 258#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 259extern int select_nohz_load_balancer(int cpu); 260#else 261static inline int select_nohz_load_balancer(int cpu) 262{ 263 return 0; 264} 265#endif 266 267/* 268 * Only dump TASK_* tasks. (0 for all tasks) 269 */ 270extern void show_state_filter(unsigned long state_filter); 271 272static inline void show_state(void) 273{ 274 show_state_filter(0); 275} 276 277extern void show_regs(struct pt_regs *); 278 279/* 280 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 281 * task), SP is the stack pointer of the first frame that should be shown in the back 282 * trace (or NULL if the entire call-chain of the task should be shown). 283 */ 284extern void show_stack(struct task_struct *task, unsigned long *sp); 285 286void io_schedule(void); 287long io_schedule_timeout(long timeout); 288 289extern void cpu_init (void); 290extern void trap_init(void); 291extern void update_process_times(int user); 292extern void scheduler_tick(void); 293 294extern void sched_show_task(struct task_struct *p); 295 296#ifdef CONFIG_DETECT_SOFTLOCKUP 297extern void softlockup_tick(void); 298extern void touch_softlockup_watchdog(void); 299extern void touch_all_softlockup_watchdogs(void); 300extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write, 301 struct file *filp, void __user *buffer, 302 size_t *lenp, loff_t *ppos); 303extern unsigned int softlockup_panic; 304extern int softlockup_thresh; 305#else 306static inline void softlockup_tick(void) 307{ 308} 309static inline void touch_softlockup_watchdog(void) 310{ 311} 312static inline void touch_all_softlockup_watchdogs(void) 313{ 314} 315#endif 316 317#ifdef CONFIG_DETECT_HUNG_TASK 318extern unsigned int sysctl_hung_task_panic; 319extern unsigned long sysctl_hung_task_check_count; 320extern unsigned long sysctl_hung_task_timeout_secs; 321extern unsigned long sysctl_hung_task_warnings; 322extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, 323 struct file *filp, void __user *buffer, 324 size_t *lenp, loff_t *ppos); 325#endif 326 327/* Attach to any functions which should be ignored in wchan output. */ 328#define __sched __attribute__((__section__(".sched.text"))) 329 330/* Linker adds these: start and end of __sched functions */ 331extern char __sched_text_start[], __sched_text_end[]; 332 333/* Is this address in the __sched functions? */ 334extern int in_sched_functions(unsigned long addr); 335 336#define MAX_SCHEDULE_TIMEOUT LONG_MAX 337extern signed long schedule_timeout(signed long timeout); 338extern signed long schedule_timeout_interruptible(signed long timeout); 339extern signed long schedule_timeout_killable(signed long timeout); 340extern signed long schedule_timeout_uninterruptible(signed long timeout); 341asmlinkage void __schedule(void); 342asmlinkage void schedule(void); 343extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner); 344 345struct nsproxy; 346struct user_namespace; 347 348/* Maximum number of active map areas.. This is a random (large) number */ 349#define DEFAULT_MAX_MAP_COUNT 65536 350 351extern int sysctl_max_map_count; 352 353#include <linux/aio.h> 354 355extern unsigned long 356arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 357 unsigned long, unsigned long); 358extern unsigned long 359arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 360 unsigned long len, unsigned long pgoff, 361 unsigned long flags); 362extern void arch_unmap_area(struct mm_struct *, unsigned long); 363extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 364 365#if USE_SPLIT_PTLOCKS 366/* 367 * The mm counters are not protected by its page_table_lock, 368 * so must be incremented atomically. 369 */ 370#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) 371#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) 372#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) 373#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) 374#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) 375 376#else /* !USE_SPLIT_PTLOCKS */ 377/* 378 * The mm counters are protected by its page_table_lock, 379 * so can be incremented directly. 380 */ 381#define set_mm_counter(mm, member, value) (mm)->_##member = (value) 382#define get_mm_counter(mm, member) ((mm)->_##member) 383#define add_mm_counter(mm, member, value) (mm)->_##member += (value) 384#define inc_mm_counter(mm, member) (mm)->_##member++ 385#define dec_mm_counter(mm, member) (mm)->_##member-- 386 387#endif /* !USE_SPLIT_PTLOCKS */ 388 389#define get_mm_rss(mm) \ 390 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) 391#define update_hiwater_rss(mm) do { \ 392 unsigned long _rss = get_mm_rss(mm); \ 393 if ((mm)->hiwater_rss < _rss) \ 394 (mm)->hiwater_rss = _rss; \ 395} while (0) 396#define update_hiwater_vm(mm) do { \ 397 if ((mm)->hiwater_vm < (mm)->total_vm) \ 398 (mm)->hiwater_vm = (mm)->total_vm; \ 399} while (0) 400 401static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) 402{ 403 return max(mm->hiwater_rss, get_mm_rss(mm)); 404} 405 406static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) 407{ 408 return max(mm->hiwater_vm, mm->total_vm); 409} 410 411extern void set_dumpable(struct mm_struct *mm, int value); 412extern int get_dumpable(struct mm_struct *mm); 413 414/* mm flags */ 415/* dumpable bits */ 416#define MMF_DUMPABLE 0 /* core dump is permitted */ 417#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 418#define MMF_DUMPABLE_BITS 2 419 420/* coredump filter bits */ 421#define MMF_DUMP_ANON_PRIVATE 2 422#define MMF_DUMP_ANON_SHARED 3 423#define MMF_DUMP_MAPPED_PRIVATE 4 424#define MMF_DUMP_MAPPED_SHARED 5 425#define MMF_DUMP_ELF_HEADERS 6 426#define MMF_DUMP_HUGETLB_PRIVATE 7 427#define MMF_DUMP_HUGETLB_SHARED 8 428#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 429#define MMF_DUMP_FILTER_BITS 7 430#define MMF_DUMP_FILTER_MASK \ 431 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 432#define MMF_DUMP_FILTER_DEFAULT \ 433 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ 434 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) 435 436#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS 437# define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) 438#else 439# define MMF_DUMP_MASK_DEFAULT_ELF 0 440#endif 441 442struct sighand_struct { 443 atomic_t count; 444 struct k_sigaction action[_NSIG]; 445 spinlock_t siglock; 446 wait_queue_head_t signalfd_wqh; 447}; 448 449struct pacct_struct { 450 int ac_flag; 451 long ac_exitcode; 452 unsigned long ac_mem; 453 cputime_t ac_utime, ac_stime; 454 unsigned long ac_minflt, ac_majflt; 455}; 456 457/** 458 * struct task_cputime - collected CPU time counts 459 * @utime: time spent in user mode, in &cputime_t units 460 * @stime: time spent in kernel mode, in &cputime_t units 461 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds 462 * 463 * This structure groups together three kinds of CPU time that are 464 * tracked for threads and thread groups. Most things considering 465 * CPU time want to group these counts together and treat all three 466 * of them in parallel. 467 */ 468struct task_cputime { 469 cputime_t utime; 470 cputime_t stime; 471 unsigned long long sum_exec_runtime; 472}; 473/* Alternate field names when used to cache expirations. */ 474#define prof_exp stime 475#define virt_exp utime 476#define sched_exp sum_exec_runtime 477 478#define INIT_CPUTIME \ 479 (struct task_cputime) { \ 480 .utime = cputime_zero, \ 481 .stime = cputime_zero, \ 482 .sum_exec_runtime = 0, \ 483 } 484 485/** 486 * struct thread_group_cputimer - thread group interval timer counts 487 * @cputime: thread group interval timers. 488 * @running: non-zero when there are timers running and 489 * @cputime receives updates. 490 * @lock: lock for fields in this struct. 491 * 492 * This structure contains the version of task_cputime, above, that is 493 * used for thread group CPU timer calculations. 494 */ 495struct thread_group_cputimer { 496 struct task_cputime cputime; 497 int running; 498 spinlock_t lock; 499}; 500 501/* 502 * NOTE! "signal_struct" does not have it's own 503 * locking, because a shared signal_struct always 504 * implies a shared sighand_struct, so locking 505 * sighand_struct is always a proper superset of 506 * the locking of signal_struct. 507 */ 508struct signal_struct { 509 atomic_t count; 510 atomic_t live; 511 512 wait_queue_head_t wait_chldexit; /* for wait4() */ 513 514 /* current thread group signal load-balancing target: */ 515 struct task_struct *curr_target; 516 517 /* shared signal handling: */ 518 struct sigpending shared_pending; 519 520 /* thread group exit support */ 521 int group_exit_code; 522 /* overloaded: 523 * - notify group_exit_task when ->count is equal to notify_count 524 * - everyone except group_exit_task is stopped during signal delivery 525 * of fatal signals, group_exit_task processes the signal. 526 */ 527 int notify_count; 528 struct task_struct *group_exit_task; 529 530 /* thread group stop support, overloads group_exit_code too */ 531 int group_stop_count; 532 unsigned int flags; /* see SIGNAL_* flags below */ 533 534 /* POSIX.1b Interval Timers */ 535 struct list_head posix_timers; 536 537 /* ITIMER_REAL timer for the process */ 538 struct hrtimer real_timer; 539 struct pid *leader_pid; 540 ktime_t it_real_incr; 541 542 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 543 cputime_t it_prof_expires, it_virt_expires; 544 cputime_t it_prof_incr, it_virt_incr; 545 546 /* 547 * Thread group totals for process CPU timers. 548 * See thread_group_cputimer(), et al, for details. 549 */ 550 struct thread_group_cputimer cputimer; 551 552 /* Earliest-expiration cache. */ 553 struct task_cputime cputime_expires; 554 555 struct list_head cpu_timers[3]; 556 557 struct pid *tty_old_pgrp; 558 559 /* boolean value for session group leader */ 560 int leader; 561 562 struct tty_struct *tty; /* NULL if no tty */ 563 564 /* 565 * Cumulative resource counters for dead threads in the group, 566 * and for reaped dead child processes forked by this group. 567 * Live threads maintain their own counters and add to these 568 * in __exit_signal, except for the group leader. 569 */ 570 cputime_t utime, stime, cutime, cstime; 571 cputime_t gtime; 572 cputime_t cgtime; 573 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 574 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 575 unsigned long inblock, oublock, cinblock, coublock; 576 struct task_io_accounting ioac; 577 578 /* 579 * Cumulative ns of schedule CPU time fo dead threads in the 580 * group, not including a zombie group leader, (This only differs 581 * from jiffies_to_ns(utime + stime) if sched_clock uses something 582 * other than jiffies.) 583 */ 584 unsigned long long sum_sched_runtime; 585 586 /* 587 * We don't bother to synchronize most readers of this at all, 588 * because there is no reader checking a limit that actually needs 589 * to get both rlim_cur and rlim_max atomically, and either one 590 * alone is a single word that can safely be read normally. 591 * getrlimit/setrlimit use task_lock(current->group_leader) to 592 * protect this instead of the siglock, because they really 593 * have no need to disable irqs. 594 */ 595 struct rlimit rlim[RLIM_NLIMITS]; 596 597#ifdef CONFIG_BSD_PROCESS_ACCT 598 struct pacct_struct pacct; /* per-process accounting information */ 599#endif 600#ifdef CONFIG_TASKSTATS 601 struct taskstats *stats; 602#endif 603#ifdef CONFIG_AUDIT 604 unsigned audit_tty; 605 struct tty_audit_buf *tty_audit_buf; 606#endif 607}; 608 609/* Context switch must be unlocked if interrupts are to be enabled */ 610#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 611# define __ARCH_WANT_UNLOCKED_CTXSW 612#endif 613 614/* 615 * Bits in flags field of signal_struct. 616 */ 617#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 618#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 619#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 620#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 621/* 622 * Pending notifications to parent. 623 */ 624#define SIGNAL_CLD_STOPPED 0x00000010 625#define SIGNAL_CLD_CONTINUED 0x00000020 626#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) 627 628#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ 629 630/* If true, all threads except ->group_exit_task have pending SIGKILL */ 631static inline int signal_group_exit(const struct signal_struct *sig) 632{ 633 return (sig->flags & SIGNAL_GROUP_EXIT) || 634 (sig->group_exit_task != NULL); 635} 636 637/* 638 * Some day this will be a full-fledged user tracking system.. 639 */ 640struct user_struct { 641 atomic_t __count; /* reference count */ 642 atomic_t processes; /* How many processes does this user have? */ 643 atomic_t files; /* How many open files does this user have? */ 644 atomic_t sigpending; /* How many pending signals does this user have? */ 645#ifdef CONFIG_INOTIFY_USER 646 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 647 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 648#endif 649#ifdef CONFIG_EPOLL 650 atomic_t epoll_watches; /* The number of file descriptors currently watched */ 651#endif 652#ifdef CONFIG_POSIX_MQUEUE 653 /* protected by mq_lock */ 654 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 655#endif 656 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 657 658#ifdef CONFIG_KEYS 659 struct key *uid_keyring; /* UID specific keyring */ 660 struct key *session_keyring; /* UID's default session keyring */ 661#endif 662 663 /* Hash table maintenance information */ 664 struct hlist_node uidhash_node; 665 uid_t uid; 666 struct user_namespace *user_ns; 667 668#ifdef CONFIG_USER_SCHED 669 struct task_group *tg; 670#ifdef CONFIG_SYSFS 671 struct kobject kobj; 672 struct work_struct work; 673#endif 674#endif 675}; 676 677extern int uids_sysfs_init(void); 678 679extern struct user_struct *find_user(uid_t); 680 681extern struct user_struct root_user; 682#define INIT_USER (&root_user) 683 684 685struct backing_dev_info; 686struct reclaim_state; 687 688#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 689struct sched_info { 690 /* cumulative counters */ 691 unsigned long pcount; /* # of times run on this cpu */ 692 unsigned long long run_delay; /* time spent waiting on a runqueue */ 693 694 /* timestamps */ 695 unsigned long long last_arrival,/* when we last ran on a cpu */ 696 last_queued; /* when we were last queued to run */ 697#ifdef CONFIG_SCHEDSTATS 698 /* BKL stats */ 699 unsigned int bkl_count; 700#endif 701}; 702#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 703 704#ifdef CONFIG_TASK_DELAY_ACCT 705struct task_delay_info { 706 spinlock_t lock; 707 unsigned int flags; /* Private per-task flags */ 708 709 /* For each stat XXX, add following, aligned appropriately 710 * 711 * struct timespec XXX_start, XXX_end; 712 * u64 XXX_delay; 713 * u32 XXX_count; 714 * 715 * Atomicity of updates to XXX_delay, XXX_count protected by 716 * single lock above (split into XXX_lock if contention is an issue). 717 */ 718 719 /* 720 * XXX_count is incremented on every XXX operation, the delay 721 * associated with the operation is added to XXX_delay. 722 * XXX_delay contains the accumulated delay time in nanoseconds. 723 */ 724 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 725 u64 blkio_delay; /* wait for sync block io completion */ 726 u64 swapin_delay; /* wait for swapin block io completion */ 727 u32 blkio_count; /* total count of the number of sync block */ 728 /* io operations performed */ 729 u32 swapin_count; /* total count of the number of swapin block */ 730 /* io operations performed */ 731 732 struct timespec freepages_start, freepages_end; 733 u64 freepages_delay; /* wait for memory reclaim */ 734 u32 freepages_count; /* total count of memory reclaim */ 735}; 736#endif /* CONFIG_TASK_DELAY_ACCT */ 737 738static inline int sched_info_on(void) 739{ 740#ifdef CONFIG_SCHEDSTATS 741 return 1; 742#elif defined(CONFIG_TASK_DELAY_ACCT) 743 extern int delayacct_on; 744 return delayacct_on; 745#else 746 return 0; 747#endif 748} 749 750enum cpu_idle_type { 751 CPU_IDLE, 752 CPU_NOT_IDLE, 753 CPU_NEWLY_IDLE, 754 CPU_MAX_IDLE_TYPES 755}; 756 757/* 758 * sched-domains (multiprocessor balancing) declarations: 759 */ 760 761/* 762 * Increase resolution of nice-level calculations: 763 */ 764#define SCHED_LOAD_SHIFT 10 765#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 766 767#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE 768 769#ifdef CONFIG_SMP 770#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 771#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 772#define SD_BALANCE_EXEC 4 /* Balance on exec */ 773#define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 774#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 775#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 776#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 777#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 778#define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ 779#define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ 780#define SD_SERIALIZE 1024 /* Only a single load balancing instance */ 781#define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */ 782 783enum powersavings_balance_level { 784 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ 785 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package 786 * first for long running threads 787 */ 788 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle 789 * cpu package for power savings 790 */ 791 MAX_POWERSAVINGS_BALANCE_LEVELS 792}; 793 794extern int sched_mc_power_savings, sched_smt_power_savings; 795 796static inline int sd_balance_for_mc_power(void) 797{ 798 if (sched_smt_power_savings) 799 return SD_POWERSAVINGS_BALANCE; 800 801 return 0; 802} 803 804static inline int sd_balance_for_package_power(void) 805{ 806 if (sched_mc_power_savings | sched_smt_power_savings) 807 return SD_POWERSAVINGS_BALANCE; 808 809 return 0; 810} 811 812/* 813 * Optimise SD flags for power savings: 814 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings. 815 * Keep default SD flags if sched_{smt,mc}_power_saving=0 816 */ 817 818static inline int sd_power_saving_flags(void) 819{ 820 if (sched_mc_power_savings | sched_smt_power_savings) 821 return SD_BALANCE_NEWIDLE; 822 823 return 0; 824} 825 826struct sched_group { 827 struct sched_group *next; /* Must be a circular list */ 828 829 /* 830 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 831 * single CPU. This is read only (except for setup, hotplug CPU). 832 * Note : Never change cpu_power without recompute its reciprocal 833 */ 834 unsigned int __cpu_power; 835 /* 836 * reciprocal value of cpu_power to avoid expensive divides 837 * (see include/linux/reciprocal_div.h) 838 */ 839 u32 reciprocal_cpu_power; 840 841 unsigned long cpumask[]; 842}; 843 844static inline struct cpumask *sched_group_cpus(struct sched_group *sg) 845{ 846 return to_cpumask(sg->cpumask); 847} 848 849enum sched_domain_level { 850 SD_LV_NONE = 0, 851 SD_LV_SIBLING, 852 SD_LV_MC, 853 SD_LV_CPU, 854 SD_LV_NODE, 855 SD_LV_ALLNODES, 856 SD_LV_MAX 857}; 858 859struct sched_domain_attr { 860 int relax_domain_level; 861}; 862 863#define SD_ATTR_INIT (struct sched_domain_attr) { \ 864 .relax_domain_level = -1, \ 865} 866 867struct sched_domain { 868 /* These fields must be setup */ 869 struct sched_domain *parent; /* top domain must be null terminated */ 870 struct sched_domain *child; /* bottom domain must be null terminated */ 871 struct sched_group *groups; /* the balancing groups of the domain */ 872 unsigned long min_interval; /* Minimum balance interval ms */ 873 unsigned long max_interval; /* Maximum balance interval ms */ 874 unsigned int busy_factor; /* less balancing by factor if busy */ 875 unsigned int imbalance_pct; /* No balance until over watermark */ 876 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 877 unsigned int busy_idx; 878 unsigned int idle_idx; 879 unsigned int newidle_idx; 880 unsigned int wake_idx; 881 unsigned int forkexec_idx; 882 int flags; /* See SD_* */ 883 enum sched_domain_level level; 884 885 /* Runtime fields. */ 886 unsigned long last_balance; /* init to jiffies. units in jiffies */ 887 unsigned int balance_interval; /* initialise to 1. units in ms. */ 888 unsigned int nr_balance_failed; /* initialise to 0 */ 889 890 u64 last_update; 891 892#ifdef CONFIG_SCHEDSTATS 893 /* load_balance() stats */ 894 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 895 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 896 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 897 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 898 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 899 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 900 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 901 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 902 903 /* Active load balancing */ 904 unsigned int alb_count; 905 unsigned int alb_failed; 906 unsigned int alb_pushed; 907 908 /* SD_BALANCE_EXEC stats */ 909 unsigned int sbe_count; 910 unsigned int sbe_balanced; 911 unsigned int sbe_pushed; 912 913 /* SD_BALANCE_FORK stats */ 914 unsigned int sbf_count; 915 unsigned int sbf_balanced; 916 unsigned int sbf_pushed; 917 918 /* try_to_wake_up() stats */ 919 unsigned int ttwu_wake_remote; 920 unsigned int ttwu_move_affine; 921 unsigned int ttwu_move_balance; 922#endif 923#ifdef CONFIG_SCHED_DEBUG 924 char *name; 925#endif 926 927 /* span of all CPUs in this domain */ 928 unsigned long span[]; 929}; 930 931static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 932{ 933 return to_cpumask(sd->span); 934} 935 936extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new, 937 struct sched_domain_attr *dattr_new); 938 939/* Test a flag in parent sched domain */ 940static inline int test_sd_parent(struct sched_domain *sd, int flag) 941{ 942 if (sd->parent && (sd->parent->flags & flag)) 943 return 1; 944 945 return 0; 946} 947 948#else /* CONFIG_SMP */ 949 950struct sched_domain_attr; 951 952static inline void 953partition_sched_domains(int ndoms_new, struct cpumask *doms_new, 954 struct sched_domain_attr *dattr_new) 955{ 956} 957#endif /* !CONFIG_SMP */ 958 959struct io_context; /* See blkdev.h */ 960 961 962#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 963extern void prefetch_stack(struct task_struct *t); 964#else 965static inline void prefetch_stack(struct task_struct *t) { } 966#endif 967 968struct audit_context; /* See audit.c */ 969struct mempolicy; 970struct pipe_inode_info; 971struct uts_namespace; 972 973struct rq; 974struct sched_domain; 975 976struct sched_class { 977 const struct sched_class *next; 978 979 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); 980 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); 981 void (*yield_task) (struct rq *rq); 982 983 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync); 984 985 struct task_struct * (*pick_next_task) (struct rq *rq); 986 void (*put_prev_task) (struct rq *rq, struct task_struct *p); 987 988#ifdef CONFIG_SMP 989 int (*select_task_rq)(struct task_struct *p, int sync); 990 991 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, 992 struct rq *busiest, unsigned long max_load_move, 993 struct sched_domain *sd, enum cpu_idle_type idle, 994 int *all_pinned, int *this_best_prio); 995 996 int (*move_one_task) (struct rq *this_rq, int this_cpu, 997 struct rq *busiest, struct sched_domain *sd, 998 enum cpu_idle_type idle); 999 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); 1000 int (*needs_post_schedule) (struct rq *this_rq); 1001 void (*post_schedule) (struct rq *this_rq); 1002 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task); 1003 1004 void (*set_cpus_allowed)(struct task_struct *p, 1005 const struct cpumask *newmask); 1006 1007 void (*rq_online)(struct rq *rq); 1008 void (*rq_offline)(struct rq *rq); 1009#endif 1010 1011 void (*set_curr_task) (struct rq *rq); 1012 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 1013 void (*task_new) (struct rq *rq, struct task_struct *p); 1014 1015 void (*switched_from) (struct rq *this_rq, struct task_struct *task, 1016 int running); 1017 void (*switched_to) (struct rq *this_rq, struct task_struct *task, 1018 int running); 1019 void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 1020 int oldprio, int running); 1021 1022#ifdef CONFIG_FAIR_GROUP_SCHED 1023 void (*moved_group) (struct task_struct *p); 1024#endif 1025}; 1026 1027struct load_weight { 1028 unsigned long weight, inv_weight; 1029}; 1030 1031/* 1032 * CFS stats for a schedulable entity (task, task-group etc) 1033 * 1034 * Current field usage histogram: 1035 * 1036 * 4 se->block_start 1037 * 4 se->run_node 1038 * 4 se->sleep_start 1039 * 6 se->load.weight 1040 */ 1041struct sched_entity { 1042 struct load_weight load; /* for load-balancing */ 1043 struct rb_node run_node; 1044 struct list_head group_node; 1045 unsigned int on_rq; 1046 1047 u64 exec_start; 1048 u64 sum_exec_runtime; 1049 u64 vruntime; 1050 u64 prev_sum_exec_runtime; 1051 1052 u64 last_wakeup; 1053 u64 avg_overlap; 1054 1055 u64 start_runtime; 1056 u64 avg_wakeup; 1057 u64 nr_migrations; 1058 1059#ifdef CONFIG_SCHEDSTATS 1060 u64 wait_start; 1061 u64 wait_max; 1062 u64 wait_count; 1063 u64 wait_sum; 1064 1065 u64 sleep_start; 1066 u64 sleep_max; 1067 s64 sum_sleep_runtime; 1068 1069 u64 block_start; 1070 u64 block_max; 1071 u64 exec_max; 1072 u64 slice_max; 1073 1074 u64 nr_migrations_cold; 1075 u64 nr_failed_migrations_affine; 1076 u64 nr_failed_migrations_running; 1077 u64 nr_failed_migrations_hot; 1078 u64 nr_forced_migrations; 1079 u64 nr_forced2_migrations; 1080 1081 u64 nr_wakeups; 1082 u64 nr_wakeups_sync; 1083 u64 nr_wakeups_migrate; 1084 u64 nr_wakeups_local; 1085 u64 nr_wakeups_remote; 1086 u64 nr_wakeups_affine; 1087 u64 nr_wakeups_affine_attempts; 1088 u64 nr_wakeups_passive; 1089 u64 nr_wakeups_idle; 1090#endif 1091 1092#ifdef CONFIG_FAIR_GROUP_SCHED 1093 struct sched_entity *parent; 1094 /* rq on which this entity is (to be) queued: */ 1095 struct cfs_rq *cfs_rq; 1096 /* rq "owned" by this entity/group: */ 1097 struct cfs_rq *my_q; 1098#endif 1099}; 1100 1101struct sched_rt_entity { 1102 struct list_head run_list; 1103 unsigned long timeout; 1104 unsigned int time_slice; 1105 int nr_cpus_allowed; 1106 1107 struct sched_rt_entity *back; 1108#ifdef CONFIG_RT_GROUP_SCHED 1109 struct sched_rt_entity *parent; 1110 /* rq on which this entity is (to be) queued: */ 1111 struct rt_rq *rt_rq; 1112 /* rq "owned" by this entity/group: */ 1113 struct rt_rq *my_q; 1114#endif 1115}; 1116 1117struct task_struct { 1118 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 1119 void *stack; 1120 atomic_t usage; 1121 unsigned int flags; /* per process flags, defined below */ 1122 unsigned int ptrace; 1123 1124 int lock_depth; /* BKL lock depth */ 1125 1126#ifdef CONFIG_SMP 1127#ifdef __ARCH_WANT_UNLOCKED_CTXSW 1128 int oncpu; 1129#endif 1130#endif 1131 1132 int prio, static_prio, normal_prio; 1133 unsigned int rt_priority; 1134 const struct sched_class *sched_class; 1135 struct sched_entity se; 1136 struct sched_rt_entity rt; 1137 1138#ifdef CONFIG_PREEMPT_NOTIFIERS 1139 /* list of struct preempt_notifier: */ 1140 struct hlist_head preempt_notifiers; 1141#endif 1142 1143 /* 1144 * fpu_counter contains the number of consecutive context switches 1145 * that the FPU is used. If this is over a threshold, the lazy fpu 1146 * saving becomes unlazy to save the trap. This is an unsigned char 1147 * so that after 256 times the counter wraps and the behavior turns 1148 * lazy again; this to deal with bursty apps that only use FPU for 1149 * a short time 1150 */ 1151 unsigned char fpu_counter; 1152 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ 1153#ifdef CONFIG_BLK_DEV_IO_TRACE 1154 unsigned int btrace_seq; 1155#endif 1156 1157 unsigned int policy; 1158 cpumask_t cpus_allowed; 1159 1160#ifdef CONFIG_PREEMPT_RCU 1161 int rcu_read_lock_nesting; 1162 int rcu_flipctr_idx; 1163#endif /* #ifdef CONFIG_PREEMPT_RCU */ 1164 1165#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 1166 struct sched_info sched_info; 1167#endif 1168 1169 struct list_head tasks; 1170 struct plist_node pushable_tasks; 1171 1172 struct mm_struct *mm, *active_mm; 1173 1174/* task state */ 1175 struct linux_binfmt *binfmt; 1176 int exit_state; 1177 int exit_code, exit_signal; 1178 int pdeath_signal; /* The signal sent when the parent dies */ 1179 /* ??? */ 1180 unsigned int personality; 1181 unsigned did_exec:1; 1182 unsigned in_execve:1; /* Tell the LSMs that the process is doing an 1183 * execve */ 1184 pid_t pid; 1185 pid_t tgid; 1186 1187 /* Canary value for the -fstack-protector gcc feature */ 1188 unsigned long stack_canary; 1189 1190 /* 1191 * pointers to (original) parent process, youngest child, younger sibling, 1192 * older sibling, respectively. (p->father can be replaced with 1193 * p->real_parent->pid) 1194 */ 1195 struct task_struct *real_parent; /* real parent process */ 1196 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ 1197 /* 1198 * children/sibling forms the list of my natural children 1199 */ 1200 struct list_head children; /* list of my children */ 1201 struct list_head sibling; /* linkage in my parent's children list */ 1202 struct task_struct *group_leader; /* threadgroup leader */ 1203 1204 /* 1205 * ptraced is the list of tasks this task is using ptrace on. 1206 * This includes both natural children and PTRACE_ATTACH targets. 1207 * p->ptrace_entry is p's link on the p->parent->ptraced list. 1208 */ 1209 struct list_head ptraced; 1210 struct list_head ptrace_entry; 1211 1212#ifdef CONFIG_X86_PTRACE_BTS 1213 /* 1214 * This is the tracer handle for the ptrace BTS extension. 1215 * This field actually belongs to the ptracer task. 1216 */ 1217 struct bts_tracer *bts; 1218 /* 1219 * The buffer to hold the BTS data. 1220 */ 1221 void *bts_buffer; 1222 size_t bts_size; 1223#endif /* CONFIG_X86_PTRACE_BTS */ 1224 1225 /* PID/PID hash table linkage. */ 1226 struct pid_link pids[PIDTYPE_MAX]; 1227 struct list_head thread_group; 1228 1229 struct completion *vfork_done; /* for vfork() */ 1230 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1231 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1232 1233 cputime_t utime, stime, utimescaled, stimescaled; 1234 cputime_t gtime; 1235 cputime_t prev_utime, prev_stime; 1236 unsigned long nvcsw, nivcsw; /* context switch counts */ 1237 struct timespec start_time; /* monotonic time */ 1238 struct timespec real_start_time; /* boot based time */ 1239/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1240 unsigned long min_flt, maj_flt; 1241 1242 struct task_cputime cputime_expires; 1243 struct list_head cpu_timers[3]; 1244 1245/* process credentials */ 1246 const struct cred *real_cred; /* objective and real subjective task 1247 * credentials (COW) */ 1248 const struct cred *cred; /* effective (overridable) subjective task 1249 * credentials (COW) */ 1250 struct mutex cred_exec_mutex; /* execve vs ptrace cred calculation mutex */ 1251 1252 char comm[TASK_COMM_LEN]; /* executable name excluding path 1253 - access with [gs]et_task_comm (which lock 1254 it with task_lock()) 1255 - initialized normally by flush_old_exec */ 1256/* file system info */ 1257 int link_count, total_link_count; 1258#ifdef CONFIG_SYSVIPC 1259/* ipc stuff */ 1260 struct sysv_sem sysvsem; 1261#endif 1262#ifdef CONFIG_DETECT_HUNG_TASK 1263/* hung task detection */ 1264 unsigned long last_switch_count; 1265#endif 1266/* CPU-specific state of this task */ 1267 struct thread_struct thread; 1268/* filesystem information */ 1269 struct fs_struct *fs; 1270/* open file information */ 1271 struct files_struct *files; 1272/* namespaces */ 1273 struct nsproxy *nsproxy; 1274/* signal handlers */ 1275 struct signal_struct *signal; 1276 struct sighand_struct *sighand; 1277 1278 sigset_t blocked, real_blocked; 1279 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ 1280 struct sigpending pending; 1281 1282 unsigned long sas_ss_sp; 1283 size_t sas_ss_size; 1284 int (*notifier)(void *priv); 1285 void *notifier_data; 1286 sigset_t *notifier_mask; 1287 struct audit_context *audit_context; 1288#ifdef CONFIG_AUDITSYSCALL 1289 uid_t loginuid; 1290 unsigned int sessionid; 1291#endif 1292 seccomp_t seccomp; 1293 1294/* Thread group tracking */ 1295 u32 parent_exec_id; 1296 u32 self_exec_id; 1297/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 1298 spinlock_t alloc_lock; 1299 1300#ifdef CONFIG_GENERIC_HARDIRQS 1301 /* IRQ handler threads */ 1302 struct irqaction *irqaction; 1303#endif 1304 1305 /* Protection of the PI data structures: */ 1306 spinlock_t pi_lock; 1307 1308#ifdef CONFIG_RT_MUTEXES 1309 /* PI waiters blocked on a rt_mutex held by this task */ 1310 struct plist_head pi_waiters; 1311 /* Deadlock detection and priority inheritance handling */ 1312 struct rt_mutex_waiter *pi_blocked_on; 1313#endif 1314 1315#ifdef CONFIG_DEBUG_MUTEXES 1316 /* mutex deadlock detection */ 1317 struct mutex_waiter *blocked_on; 1318#endif 1319#ifdef CONFIG_TRACE_IRQFLAGS 1320 unsigned int irq_events; 1321 int hardirqs_enabled; 1322 unsigned long hardirq_enable_ip; 1323 unsigned int hardirq_enable_event; 1324 unsigned long hardirq_disable_ip; 1325 unsigned int hardirq_disable_event; 1326 int softirqs_enabled; 1327 unsigned long softirq_disable_ip; 1328 unsigned int softirq_disable_event; 1329 unsigned long softirq_enable_ip; 1330 unsigned int softirq_enable_event; 1331 int hardirq_context; 1332 int softirq_context; 1333#endif 1334#ifdef CONFIG_LOCKDEP 1335# define MAX_LOCK_DEPTH 48UL 1336 u64 curr_chain_key; 1337 int lockdep_depth; 1338 unsigned int lockdep_recursion; 1339 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1340 gfp_t lockdep_reclaim_gfp; 1341#endif 1342 1343/* journalling filesystem info */ 1344 void *journal_info; 1345 1346/* stacked block device info */ 1347 struct bio *bio_list, **bio_tail; 1348 1349/* VM state */ 1350 struct reclaim_state *reclaim_state; 1351 1352 struct backing_dev_info *backing_dev_info; 1353 1354 struct io_context *io_context; 1355 1356 unsigned long ptrace_message; 1357 siginfo_t *last_siginfo; /* For ptrace use. */ 1358 struct task_io_accounting ioac; 1359#if defined(CONFIG_TASK_XACCT) 1360 u64 acct_rss_mem1; /* accumulated rss usage */ 1361 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1362 cputime_t acct_timexpd; /* stime + utime since last update */ 1363#endif 1364#ifdef CONFIG_CPUSETS 1365 nodemask_t mems_allowed; 1366 int cpuset_mems_generation; 1367 int cpuset_mem_spread_rotor; 1368#endif 1369#ifdef CONFIG_CGROUPS 1370 /* Control Group info protected by css_set_lock */ 1371 struct css_set *cgroups; 1372 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1373 struct list_head cg_list; 1374#endif 1375#ifdef CONFIG_FUTEX 1376 struct robust_list_head __user *robust_list; 1377#ifdef CONFIG_COMPAT 1378 struct compat_robust_list_head __user *compat_robust_list; 1379#endif 1380 struct list_head pi_state_list; 1381 struct futex_pi_state *pi_state_cache; 1382#endif 1383#ifdef CONFIG_NUMA 1384 struct mempolicy *mempolicy; 1385 short il_next; 1386#endif 1387 atomic_t fs_excl; /* holding fs exclusive resources */ 1388 struct rcu_head rcu; 1389 1390 /* 1391 * cache last used pipe for splice 1392 */ 1393 struct pipe_inode_info *splice_pipe; 1394#ifdef CONFIG_TASK_DELAY_ACCT 1395 struct task_delay_info *delays; 1396#endif 1397#ifdef CONFIG_FAULT_INJECTION 1398 int make_it_fail; 1399#endif 1400 struct prop_local_single dirties; 1401#ifdef CONFIG_LATENCYTOP 1402 int latency_record_count; 1403 struct latency_record latency_record[LT_SAVECOUNT]; 1404#endif 1405 /* 1406 * time slack values; these are used to round up poll() and 1407 * select() etc timeout values. These are in nanoseconds. 1408 */ 1409 unsigned long timer_slack_ns; 1410 unsigned long default_timer_slack_ns; 1411 1412 struct list_head *scm_work_list; 1413#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1414 /* Index of current stored adress in ret_stack */ 1415 int curr_ret_stack; 1416 /* Stack of return addresses for return function tracing */ 1417 struct ftrace_ret_stack *ret_stack; 1418 /* time stamp for last schedule */ 1419 unsigned long long ftrace_timestamp; 1420 /* 1421 * Number of functions that haven't been traced 1422 * because of depth overrun. 1423 */ 1424 atomic_t trace_overrun; 1425 /* Pause for the tracing */ 1426 atomic_t tracing_graph_pause; 1427#endif 1428#ifdef CONFIG_TRACING 1429 /* state flags for use by tracers */ 1430 unsigned long trace; 1431#endif 1432}; 1433 1434/* Future-safe accessor for struct task_struct's cpus_allowed. */ 1435#define tsk_cpumask(tsk) (&(tsk)->cpus_allowed) 1436 1437/* 1438 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1439 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1440 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1441 * values are inverted: lower p->prio value means higher priority. 1442 * 1443 * The MAX_USER_RT_PRIO value allows the actual maximum 1444 * RT priority to be separate from the value exported to 1445 * user-space. This allows kernel threads to set their 1446 * priority to a value higher than any user task. Note: 1447 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1448 */ 1449 1450#define MAX_USER_RT_PRIO 100 1451#define MAX_RT_PRIO MAX_USER_RT_PRIO 1452 1453#define MAX_PRIO (MAX_RT_PRIO + 40) 1454#define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1455 1456static inline int rt_prio(int prio) 1457{ 1458 if (unlikely(prio < MAX_RT_PRIO)) 1459 return 1; 1460 return 0; 1461} 1462 1463static inline int rt_task(struct task_struct *p) 1464{ 1465 return rt_prio(p->prio); 1466} 1467 1468static inline struct pid *task_pid(struct task_struct *task) 1469{ 1470 return task->pids[PIDTYPE_PID].pid; 1471} 1472 1473static inline struct pid *task_tgid(struct task_struct *task) 1474{ 1475 return task->group_leader->pids[PIDTYPE_PID].pid; 1476} 1477 1478/* 1479 * Without tasklist or rcu lock it is not safe to dereference 1480 * the result of task_pgrp/task_session even if task == current, 1481 * we can race with another thread doing sys_setsid/sys_setpgid. 1482 */ 1483static inline struct pid *task_pgrp(struct task_struct *task) 1484{ 1485 return task->group_leader->pids[PIDTYPE_PGID].pid; 1486} 1487 1488static inline struct pid *task_session(struct task_struct *task) 1489{ 1490 return task->group_leader->pids[PIDTYPE_SID].pid; 1491} 1492 1493struct pid_namespace; 1494 1495/* 1496 * the helpers to get the task's different pids as they are seen 1497 * from various namespaces 1498 * 1499 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1500 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 1501 * current. 1502 * task_xid_nr_ns() : id seen from the ns specified; 1503 * 1504 * set_task_vxid() : assigns a virtual id to a task; 1505 * 1506 * see also pid_nr() etc in include/linux/pid.h 1507 */ 1508pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, 1509 struct pid_namespace *ns); 1510 1511static inline pid_t task_pid_nr(struct task_struct *tsk) 1512{ 1513 return tsk->pid; 1514} 1515 1516static inline pid_t task_pid_nr_ns(struct task_struct *tsk, 1517 struct pid_namespace *ns) 1518{ 1519 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); 1520} 1521 1522static inline pid_t task_pid_vnr(struct task_struct *tsk) 1523{ 1524 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); 1525} 1526 1527 1528static inline pid_t task_tgid_nr(struct task_struct *tsk) 1529{ 1530 return tsk->tgid; 1531} 1532 1533pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1534 1535static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1536{ 1537 return pid_vnr(task_tgid(tsk)); 1538} 1539 1540 1541static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, 1542 struct pid_namespace *ns) 1543{ 1544 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); 1545} 1546 1547static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1548{ 1549 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); 1550} 1551 1552 1553static inline pid_t task_session_nr_ns(struct task_struct *tsk, 1554 struct pid_namespace *ns) 1555{ 1556 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); 1557} 1558 1559static inline pid_t task_session_vnr(struct task_struct *tsk) 1560{ 1561 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); 1562} 1563 1564/* obsolete, do not use */ 1565static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1566{ 1567 return task_pgrp_nr_ns(tsk, &init_pid_ns); 1568} 1569 1570/** 1571 * pid_alive - check that a task structure is not stale 1572 * @p: Task structure to be checked. 1573 * 1574 * Test if a process is not yet dead (at most zombie state) 1575 * If pid_alive fails, then pointers within the task structure 1576 * can be stale and must not be dereferenced. 1577 */ 1578static inline int pid_alive(struct task_struct *p) 1579{ 1580 return p->pids[PIDTYPE_PID].pid != NULL; 1581} 1582 1583/** 1584 * is_global_init - check if a task structure is init 1585 * @tsk: Task structure to be checked. 1586 * 1587 * Check if a task structure is the first user space task the kernel created. 1588 */ 1589static inline int is_global_init(struct task_struct *tsk) 1590{ 1591 return tsk->pid == 1; 1592} 1593 1594/* 1595 * is_container_init: 1596 * check whether in the task is init in its own pid namespace. 1597 */ 1598extern int is_container_init(struct task_struct *tsk); 1599 1600extern struct pid *cad_pid; 1601 1602extern void free_task(struct task_struct *tsk); 1603#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1604 1605extern void __put_task_struct(struct task_struct *t); 1606 1607static inline void put_task_struct(struct task_struct *t) 1608{ 1609 if (atomic_dec_and_test(&t->usage)) 1610 __put_task_struct(t); 1611} 1612 1613extern cputime_t task_utime(struct task_struct *p); 1614extern cputime_t task_stime(struct task_struct *p); 1615extern cputime_t task_gtime(struct task_struct *p); 1616 1617/* 1618 * Per process flags 1619 */ 1620#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 1621 /* Not implemented yet, only for 486*/ 1622#define PF_STARTING 0x00000002 /* being created */ 1623#define PF_EXITING 0x00000004 /* getting shut down */ 1624#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1625#define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1626#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1627#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1628#define PF_DUMPCORE 0x00000200 /* dumped core */ 1629#define PF_SIGNALED 0x00000400 /* killed by a signal */ 1630#define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1631#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 1632#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1633#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1634#define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1635#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1636#define PF_KSWAPD 0x00040000 /* I am kswapd */ 1637#define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 1638#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1639#define PF_KTHREAD 0x00200000 /* I am a kernel thread */ 1640#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1641#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1642#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1643#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1644#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ 1645#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1646#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1647#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1648#define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ 1649 1650/* 1651 * Only the _current_ task can read/write to tsk->flags, but other 1652 * tasks can access tsk->flags in readonly mode for example 1653 * with tsk_used_math (like during threaded core dumping). 1654 * There is however an exception to this rule during ptrace 1655 * or during fork: the ptracer task is allowed to write to the 1656 * child->flags of its traced child (same goes for fork, the parent 1657 * can write to the child->flags), because we're guaranteed the 1658 * child is not running and in turn not changing child->flags 1659 * at the same time the parent does it. 1660 */ 1661#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1662#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1663#define clear_used_math() clear_stopped_child_used_math(current) 1664#define set_used_math() set_stopped_child_used_math(current) 1665#define conditional_stopped_child_used_math(condition, child) \ 1666 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1667#define conditional_used_math(condition) \ 1668 conditional_stopped_child_used_math(condition, current) 1669#define copy_to_stopped_child_used_math(child) \ 1670 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1671/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1672#define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1673#define used_math() tsk_used_math(current) 1674 1675#ifdef CONFIG_SMP 1676extern int set_cpus_allowed_ptr(struct task_struct *p, 1677 const struct cpumask *new_mask); 1678#else 1679static inline int set_cpus_allowed_ptr(struct task_struct *p, 1680 const struct cpumask *new_mask) 1681{ 1682 if (!cpumask_test_cpu(0, new_mask)) 1683 return -EINVAL; 1684 return 0; 1685} 1686#endif 1687static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1688{ 1689 return set_cpus_allowed_ptr(p, &new_mask); 1690} 1691 1692/* 1693 * Architectures can set this to 1 if they have specified 1694 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, 1695 * but then during bootup it turns out that sched_clock() 1696 * is reliable after all: 1697 */ 1698#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1699extern int sched_clock_stable; 1700#endif 1701 1702extern unsigned long long sched_clock(void); 1703 1704extern void sched_clock_init(void); 1705extern u64 sched_clock_cpu(int cpu); 1706 1707#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1708static inline void sched_clock_tick(void) 1709{ 1710} 1711 1712static inline void sched_clock_idle_sleep_event(void) 1713{ 1714} 1715 1716static inline void sched_clock_idle_wakeup_event(u64 delta_ns) 1717{ 1718} 1719#else 1720extern void sched_clock_tick(void); 1721extern void sched_clock_idle_sleep_event(void); 1722extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1723#endif 1724 1725/* 1726 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1727 * clock constructed from sched_clock(): 1728 */ 1729extern unsigned long long cpu_clock(int cpu); 1730 1731extern unsigned long long 1732task_sched_runtime(struct task_struct *task); 1733extern unsigned long long thread_group_sched_runtime(struct task_struct *task); 1734 1735/* sched_exec is called by processes performing an exec */ 1736#ifdef CONFIG_SMP 1737extern void sched_exec(void); 1738#else 1739#define sched_exec() {} 1740#endif 1741 1742extern void sched_clock_idle_sleep_event(void); 1743extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1744 1745#ifdef CONFIG_HOTPLUG_CPU 1746extern void idle_task_exit(void); 1747#else 1748static inline void idle_task_exit(void) {} 1749#endif 1750 1751extern void sched_idle_next(void); 1752 1753#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) 1754extern void wake_up_idle_cpu(int cpu); 1755#else 1756static inline void wake_up_idle_cpu(int cpu) { } 1757#endif 1758 1759extern unsigned int sysctl_sched_latency; 1760extern unsigned int sysctl_sched_min_granularity; 1761extern unsigned int sysctl_sched_wakeup_granularity; 1762extern unsigned int sysctl_sched_shares_ratelimit; 1763extern unsigned int sysctl_sched_shares_thresh; 1764#ifdef CONFIG_SCHED_DEBUG 1765extern unsigned int sysctl_sched_child_runs_first; 1766extern unsigned int sysctl_sched_features; 1767extern unsigned int sysctl_sched_migration_cost; 1768extern unsigned int sysctl_sched_nr_migrate; 1769 1770int sched_nr_latency_handler(struct ctl_table *table, int write, 1771 struct file *file, void __user *buffer, size_t *length, 1772 loff_t *ppos); 1773#endif 1774extern unsigned int sysctl_sched_rt_period; 1775extern int sysctl_sched_rt_runtime; 1776 1777int sched_rt_handler(struct ctl_table *table, int write, 1778 struct file *filp, void __user *buffer, size_t *lenp, 1779 loff_t *ppos); 1780 1781extern unsigned int sysctl_sched_compat_yield; 1782 1783#ifdef CONFIG_RT_MUTEXES 1784extern int rt_mutex_getprio(struct task_struct *p); 1785extern void rt_mutex_setprio(struct task_struct *p, int prio); 1786extern void rt_mutex_adjust_pi(struct task_struct *p); 1787#else 1788static inline int rt_mutex_getprio(struct task_struct *p) 1789{ 1790 return p->normal_prio; 1791} 1792# define rt_mutex_adjust_pi(p) do { } while (0) 1793#endif 1794 1795extern void set_user_nice(struct task_struct *p, long nice); 1796extern int task_prio(const struct task_struct *p); 1797extern int task_nice(const struct task_struct *p); 1798extern int can_nice(const struct task_struct *p, const int nice); 1799extern int task_curr(const struct task_struct *p); 1800extern int idle_cpu(int cpu); 1801extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1802extern int sched_setscheduler_nocheck(struct task_struct *, int, 1803 struct sched_param *); 1804extern struct task_struct *idle_task(int cpu); 1805extern struct task_struct *curr_task(int cpu); 1806extern void set_curr_task(int cpu, struct task_struct *p); 1807 1808void yield(void); 1809 1810/* 1811 * The default (Linux) execution domain. 1812 */ 1813extern struct exec_domain default_exec_domain; 1814 1815union thread_union { 1816 struct thread_info thread_info; 1817 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1818}; 1819 1820#ifndef __HAVE_ARCH_KSTACK_END 1821static inline int kstack_end(void *addr) 1822{ 1823 /* Reliable end of stack detection: 1824 * Some APM bios versions misalign the stack 1825 */ 1826 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1827} 1828#endif 1829 1830extern union thread_union init_thread_union; 1831extern struct task_struct init_task; 1832 1833extern struct mm_struct init_mm; 1834 1835extern struct pid_namespace init_pid_ns; 1836 1837/* 1838 * find a task by one of its numerical ids 1839 * 1840 * find_task_by_pid_type_ns(): 1841 * it is the most generic call - it finds a task by all id, 1842 * type and namespace specified 1843 * find_task_by_pid_ns(): 1844 * finds a task by its pid in the specified namespace 1845 * find_task_by_vpid(): 1846 * finds a task by its virtual pid 1847 * 1848 * see also find_vpid() etc in include/linux/pid.h 1849 */ 1850 1851extern struct task_struct *find_task_by_pid_type_ns(int type, int pid, 1852 struct pid_namespace *ns); 1853 1854extern struct task_struct *find_task_by_vpid(pid_t nr); 1855extern struct task_struct *find_task_by_pid_ns(pid_t nr, 1856 struct pid_namespace *ns); 1857 1858extern void __set_special_pids(struct pid *pid); 1859 1860/* per-UID process charging. */ 1861extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 1862static inline struct user_struct *get_uid(struct user_struct *u) 1863{ 1864 atomic_inc(&u->__count); 1865 return u; 1866} 1867extern void free_uid(struct user_struct *); 1868extern void release_uids(struct user_namespace *ns); 1869 1870#include <asm/current.h> 1871 1872extern void do_timer(unsigned long ticks); 1873 1874extern int wake_up_state(struct task_struct *tsk, unsigned int state); 1875extern int wake_up_process(struct task_struct *tsk); 1876extern void wake_up_new_task(struct task_struct *tsk, 1877 unsigned long clone_flags); 1878#ifdef CONFIG_SMP 1879 extern void kick_process(struct task_struct *tsk); 1880#else 1881 static inline void kick_process(struct task_struct *tsk) { } 1882#endif 1883extern void sched_fork(struct task_struct *p, int clone_flags); 1884extern void sched_dead(struct task_struct *p); 1885 1886extern void proc_caches_init(void); 1887extern void flush_signals(struct task_struct *); 1888extern void ignore_signals(struct task_struct *); 1889extern void flush_signal_handlers(struct task_struct *, int force_default); 1890extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 1891 1892static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 1893{ 1894 unsigned long flags; 1895 int ret; 1896 1897 spin_lock_irqsave(&tsk->sighand->siglock, flags); 1898 ret = dequeue_signal(tsk, mask, info); 1899 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 1900 1901 return ret; 1902} 1903 1904extern void block_all_signals(int (*notifier)(void *priv), void *priv, 1905 sigset_t *mask); 1906extern void unblock_all_signals(void); 1907extern void release_task(struct task_struct * p); 1908extern int send_sig_info(int, struct siginfo *, struct task_struct *); 1909extern int force_sigsegv(int, struct task_struct *); 1910extern int force_sig_info(int, struct siginfo *, struct task_struct *); 1911extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1912extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 1913extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 1914extern int kill_pgrp(struct pid *pid, int sig, int priv); 1915extern int kill_pid(struct pid *pid, int sig, int priv); 1916extern int kill_proc_info(int, struct siginfo *, pid_t); 1917extern int do_notify_parent(struct task_struct *, int); 1918extern void force_sig(int, struct task_struct *); 1919extern void force_sig_specific(int, struct task_struct *); 1920extern int send_sig(int, struct task_struct *, int); 1921extern void zap_other_threads(struct task_struct *p); 1922extern struct sigqueue *sigqueue_alloc(void); 1923extern void sigqueue_free(struct sigqueue *); 1924extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); 1925extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 1926extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 1927 1928static inline int kill_cad_pid(int sig, int priv) 1929{ 1930 return kill_pid(cad_pid, sig, priv); 1931} 1932 1933/* These can be the second arg to send_sig_info/send_group_sig_info. */ 1934#define SEND_SIG_NOINFO ((struct siginfo *) 0) 1935#define SEND_SIG_PRIV ((struct siginfo *) 1) 1936#define SEND_SIG_FORCED ((struct siginfo *) 2) 1937 1938static inline int is_si_special(const struct siginfo *info) 1939{ 1940 return info <= SEND_SIG_FORCED; 1941} 1942 1943/* True if we are on the alternate signal stack. */ 1944 1945static inline int on_sig_stack(unsigned long sp) 1946{ 1947 return (sp - current->sas_ss_sp < current->sas_ss_size); 1948} 1949 1950static inline int sas_ss_flags(unsigned long sp) 1951{ 1952 return (current->sas_ss_size == 0 ? SS_DISABLE 1953 : on_sig_stack(sp) ? SS_ONSTACK : 0); 1954} 1955 1956/* 1957 * Routines for handling mm_structs 1958 */ 1959extern struct mm_struct * mm_alloc(void); 1960 1961/* mmdrop drops the mm and the page tables */ 1962extern void __mmdrop(struct mm_struct *); 1963static inline void mmdrop(struct mm_struct * mm) 1964{ 1965 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 1966 __mmdrop(mm); 1967} 1968 1969/* mmput gets rid of the mappings and all user-space */ 1970extern void mmput(struct mm_struct *); 1971/* Grab a reference to a task's mm, if it is not already going away */ 1972extern struct mm_struct *get_task_mm(struct task_struct *task); 1973/* Remove the current tasks stale references to the old mm_struct */ 1974extern void mm_release(struct task_struct *, struct mm_struct *); 1975/* Allocate a new mm structure and copy contents from tsk->mm */ 1976extern struct mm_struct *dup_mm(struct task_struct *tsk); 1977 1978extern int copy_thread(unsigned long, unsigned long, unsigned long, 1979 struct task_struct *, struct pt_regs *); 1980extern void flush_thread(void); 1981extern void exit_thread(void); 1982 1983extern void exit_files(struct task_struct *); 1984extern void __cleanup_signal(struct signal_struct *); 1985extern void __cleanup_sighand(struct sighand_struct *); 1986 1987extern void exit_itimers(struct signal_struct *); 1988extern void flush_itimer_signals(void); 1989 1990extern NORET_TYPE void do_group_exit(int); 1991 1992extern void daemonize(const char *, ...); 1993extern int allow_signal(int); 1994extern int disallow_signal(int); 1995 1996extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 1997extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 1998struct task_struct *fork_idle(int); 1999 2000extern void set_task_comm(struct task_struct *tsk, char *from); 2001extern char *get_task_comm(char *to, struct task_struct *tsk); 2002 2003#ifdef CONFIG_SMP 2004extern unsigned long wait_task_inactive(struct task_struct *, long match_state); 2005#else 2006static inline unsigned long wait_task_inactive(struct task_struct *p, 2007 long match_state) 2008{ 2009 return 1; 2010} 2011#endif 2012 2013#define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) 2014 2015#define for_each_process(p) \ 2016 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 2017 2018extern bool is_single_threaded(struct task_struct *); 2019 2020/* 2021 * Careful: do_each_thread/while_each_thread is a double loop so 2022 * 'break' will not work as expected - use goto instead. 2023 */ 2024#define do_each_thread(g, t) \ 2025 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 2026 2027#define while_each_thread(g, t) \ 2028 while ((t = next_thread(t)) != g) 2029 2030/* de_thread depends on thread_group_leader not being a pid based check */ 2031#define thread_group_leader(p) (p == p->group_leader) 2032 2033/* Do to the insanities of de_thread it is possible for a process 2034 * to have the pid of the thread group leader without actually being 2035 * the thread group leader. For iteration through the pids in proc 2036 * all we care about is that we have a task with the appropriate 2037 * pid, we don't actually care if we have the right task. 2038 */ 2039static inline int has_group_leader_pid(struct task_struct *p) 2040{ 2041 return p->pid == p->tgid; 2042} 2043 2044static inline 2045int same_thread_group(struct task_struct *p1, struct task_struct *p2) 2046{ 2047 return p1->tgid == p2->tgid; 2048} 2049 2050static inline struct task_struct *next_thread(const struct task_struct *p) 2051{ 2052 return list_entry(rcu_dereference(p->thread_group.next), 2053 struct task_struct, thread_group); 2054} 2055 2056static inline int thread_group_empty(struct task_struct *p) 2057{ 2058 return list_empty(&p->thread_group); 2059} 2060 2061#define delay_group_leader(p) \ 2062 (thread_group_leader(p) && !thread_group_empty(p)) 2063 2064static inline int task_detached(struct task_struct *p) 2065{ 2066 return p->exit_signal == -1; 2067} 2068 2069/* 2070 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 2071 * subscriptions and synchronises with wait4(). Also used in procfs. Also 2072 * pins the final release of task.io_context. Also protects ->cpuset and 2073 * ->cgroup.subsys[]. 2074 * 2075 * Nests both inside and outside of read_lock(&tasklist_lock). 2076 * It must not be nested with write_lock_irq(&tasklist_lock), 2077 * neither inside nor outside. 2078 */ 2079static inline void task_lock(struct task_struct *p) 2080{ 2081 spin_lock(&p->alloc_lock); 2082} 2083 2084static inline void task_unlock(struct task_struct *p) 2085{ 2086 spin_unlock(&p->alloc_lock); 2087} 2088 2089extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 2090 unsigned long *flags); 2091 2092static inline void unlock_task_sighand(struct task_struct *tsk, 2093 unsigned long *flags) 2094{ 2095 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 2096} 2097 2098#ifndef __HAVE_THREAD_FUNCTIONS 2099 2100#define task_thread_info(task) ((struct thread_info *)(task)->stack) 2101#define task_stack_page(task) ((task)->stack) 2102 2103static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 2104{ 2105 *task_thread_info(p) = *task_thread_info(org); 2106 task_thread_info(p)->task = p; 2107} 2108 2109static inline unsigned long *end_of_stack(struct task_struct *p) 2110{ 2111 return (unsigned long *)(task_thread_info(p) + 1); 2112} 2113 2114#endif 2115 2116static inline int object_is_on_stack(void *obj) 2117{ 2118 void *stack = task_stack_page(current); 2119 2120 return (obj >= stack) && (obj < (stack + THREAD_SIZE)); 2121} 2122 2123extern void thread_info_cache_init(void); 2124 2125#ifdef CONFIG_DEBUG_STACK_USAGE 2126static inline unsigned long stack_not_used(struct task_struct *p) 2127{ 2128 unsigned long *n = end_of_stack(p); 2129 2130 do { /* Skip over canary */ 2131 n++; 2132 } while (!*n); 2133 2134 return (unsigned long)n - (unsigned long)end_of_stack(p); 2135} 2136#endif 2137 2138/* set thread flags in other task's structures 2139 * - see asm/thread_info.h for TIF_xxxx flags available 2140 */ 2141static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 2142{ 2143 set_ti_thread_flag(task_thread_info(tsk), flag); 2144} 2145 2146static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2147{ 2148 clear_ti_thread_flag(task_thread_info(tsk), flag); 2149} 2150 2151static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 2152{ 2153 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 2154} 2155 2156static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2157{ 2158 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 2159} 2160 2161static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 2162{ 2163 return test_ti_thread_flag(task_thread_info(tsk), flag); 2164} 2165 2166static inline void set_tsk_need_resched(struct task_struct *tsk) 2167{ 2168 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2169} 2170 2171static inline void clear_tsk_need_resched(struct task_struct *tsk) 2172{ 2173 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2174} 2175 2176static inline int test_tsk_need_resched(struct task_struct *tsk) 2177{ 2178 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); 2179} 2180 2181static inline int restart_syscall(void) 2182{ 2183 set_tsk_thread_flag(current, TIF_SIGPENDING); 2184 return -ERESTARTNOINTR; 2185} 2186 2187static inline int signal_pending(struct task_struct *p) 2188{ 2189 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 2190} 2191 2192extern int __fatal_signal_pending(struct task_struct *p); 2193 2194static inline int fatal_signal_pending(struct task_struct *p) 2195{ 2196 return signal_pending(p) && __fatal_signal_pending(p); 2197} 2198 2199static inline int signal_pending_state(long state, struct task_struct *p) 2200{ 2201 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) 2202 return 0; 2203 if (!signal_pending(p)) 2204 return 0; 2205 2206 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); 2207} 2208 2209static inline int need_resched(void) 2210{ 2211 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 2212} 2213 2214/* 2215 * cond_resched() and cond_resched_lock(): latency reduction via 2216 * explicit rescheduling in places that are safe. The return 2217 * value indicates whether a reschedule was done in fact. 2218 * cond_resched_lock() will drop the spinlock before scheduling, 2219 * cond_resched_softirq() will enable bhs before scheduling. 2220 */ 2221extern int _cond_resched(void); 2222#ifdef CONFIG_PREEMPT_BKL 2223static inline int cond_resched(void) 2224{ 2225 return 0; 2226} 2227#else 2228static inline int cond_resched(void) 2229{ 2230 return _cond_resched(); 2231} 2232#endif 2233extern int cond_resched_lock(spinlock_t * lock); 2234extern int cond_resched_softirq(void); 2235static inline int cond_resched_bkl(void) 2236{ 2237 return _cond_resched(); 2238} 2239 2240/* 2241 * Does a critical section need to be broken due to another 2242 * task waiting?: (technically does not depend on CONFIG_PREEMPT, 2243 * but a general need for low latency) 2244 */ 2245static inline int spin_needbreak(spinlock_t *lock) 2246{ 2247#ifdef CONFIG_PREEMPT 2248 return spin_is_contended(lock); 2249#else 2250 return 0; 2251#endif 2252} 2253 2254/* 2255 * Thread group CPU time accounting. 2256 */ 2257void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); 2258void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); 2259 2260static inline void thread_group_cputime_init(struct signal_struct *sig) 2261{ 2262 sig->cputimer.cputime = INIT_CPUTIME; 2263 spin_lock_init(&sig->cputimer.lock); 2264 sig->cputimer.running = 0; 2265} 2266 2267static inline void thread_group_cputime_free(struct signal_struct *sig) 2268{ 2269} 2270 2271/* 2272 * Reevaluate whether the task has signals pending delivery. 2273 * Wake the task if so. 2274 * This is required every time the blocked sigset_t changes. 2275 * callers must hold sighand->siglock. 2276 */ 2277extern void recalc_sigpending_and_wake(struct task_struct *t); 2278extern void recalc_sigpending(void); 2279 2280extern void signal_wake_up(struct task_struct *t, int resume_stopped); 2281 2282/* 2283 * Wrappers for p->thread_info->cpu access. No-op on UP. 2284 */ 2285#ifdef CONFIG_SMP 2286 2287static inline unsigned int task_cpu(const struct task_struct *p) 2288{ 2289 return task_thread_info(p)->cpu; 2290} 2291 2292extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 2293 2294#else 2295 2296static inline unsigned int task_cpu(const struct task_struct *p) 2297{ 2298 return 0; 2299} 2300 2301static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 2302{ 2303} 2304 2305#endif /* CONFIG_SMP */ 2306 2307extern void arch_pick_mmap_layout(struct mm_struct *mm); 2308 2309#ifdef CONFIG_TRACING 2310extern void 2311__trace_special(void *__tr, void *__data, 2312 unsigned long arg1, unsigned long arg2, unsigned long arg3); 2313#else 2314static inline void 2315__trace_special(void *__tr, void *__data, 2316 unsigned long arg1, unsigned long arg2, unsigned long arg3) 2317{ 2318} 2319#endif 2320 2321extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); 2322extern long sched_getaffinity(pid_t pid, struct cpumask *mask); 2323 2324extern void normalize_rt_tasks(void); 2325 2326#ifdef CONFIG_GROUP_SCHED 2327 2328extern struct task_group init_task_group; 2329#ifdef CONFIG_USER_SCHED 2330extern struct task_group root_task_group; 2331extern void set_tg_uid(struct user_struct *user); 2332#endif 2333 2334extern struct task_group *sched_create_group(struct task_group *parent); 2335extern void sched_destroy_group(struct task_group *tg); 2336extern void sched_move_task(struct task_struct *tsk); 2337#ifdef CONFIG_FAIR_GROUP_SCHED 2338extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 2339extern unsigned long sched_group_shares(struct task_group *tg); 2340#endif 2341#ifdef CONFIG_RT_GROUP_SCHED 2342extern int sched_group_set_rt_runtime(struct task_group *tg, 2343 long rt_runtime_us); 2344extern long sched_group_rt_runtime(struct task_group *tg); 2345extern int sched_group_set_rt_period(struct task_group *tg, 2346 long rt_period_us); 2347extern long sched_group_rt_period(struct task_group *tg); 2348extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); 2349#endif 2350#endif 2351 2352extern int task_can_switch_user(struct user_struct *up, 2353 struct task_struct *tsk); 2354 2355#ifdef CONFIG_TASK_XACCT 2356static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2357{ 2358 tsk->ioac.rchar += amt; 2359} 2360 2361static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2362{ 2363 tsk->ioac.wchar += amt; 2364} 2365 2366static inline void inc_syscr(struct task_struct *tsk) 2367{ 2368 tsk->ioac.syscr++; 2369} 2370 2371static inline void inc_syscw(struct task_struct *tsk) 2372{ 2373 tsk->ioac.syscw++; 2374} 2375#else 2376static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2377{ 2378} 2379 2380static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2381{ 2382} 2383 2384static inline void inc_syscr(struct task_struct *tsk) 2385{ 2386} 2387 2388static inline void inc_syscw(struct task_struct *tsk) 2389{ 2390} 2391#endif 2392 2393#ifndef TASK_SIZE_OF 2394#define TASK_SIZE_OF(tsk) TASK_SIZE 2395#endif 2396 2397#ifdef CONFIG_MM_OWNER 2398extern void mm_update_next_owner(struct mm_struct *mm); 2399extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); 2400#else 2401static inline void mm_update_next_owner(struct mm_struct *mm) 2402{ 2403} 2404 2405static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) 2406{ 2407} 2408#endif /* CONFIG_MM_OWNER */ 2409 2410#define TASK_STATE_TO_CHAR_STR "RSDTtZX" 2411 2412#endif /* __KERNEL__ */ 2413 2414#endif 2415