sched.h revision df54d6fa54275ce59660453e29d1228c2b45a826
1#ifndef _LINUX_SCHED_H 2#define _LINUX_SCHED_H 3 4#include <uapi/linux/sched.h> 5 6 7struct sched_param { 8 int sched_priority; 9}; 10 11#include <asm/param.h> /* for HZ */ 12 13#include <linux/capability.h> 14#include <linux/threads.h> 15#include <linux/kernel.h> 16#include <linux/types.h> 17#include <linux/timex.h> 18#include <linux/jiffies.h> 19#include <linux/rbtree.h> 20#include <linux/thread_info.h> 21#include <linux/cpumask.h> 22#include <linux/errno.h> 23#include <linux/nodemask.h> 24#include <linux/mm_types.h> 25 26#include <asm/page.h> 27#include <asm/ptrace.h> 28#include <asm/cputime.h> 29 30#include <linux/smp.h> 31#include <linux/sem.h> 32#include <linux/signal.h> 33#include <linux/compiler.h> 34#include <linux/completion.h> 35#include <linux/pid.h> 36#include <linux/percpu.h> 37#include <linux/topology.h> 38#include <linux/proportions.h> 39#include <linux/seccomp.h> 40#include <linux/rcupdate.h> 41#include <linux/rculist.h> 42#include <linux/rtmutex.h> 43 44#include <linux/time.h> 45#include <linux/param.h> 46#include <linux/resource.h> 47#include <linux/timer.h> 48#include <linux/hrtimer.h> 49#include <linux/task_io_accounting.h> 50#include <linux/latencytop.h> 51#include <linux/cred.h> 52#include <linux/llist.h> 53#include <linux/uidgid.h> 54#include <linux/gfp.h> 55 56#include <asm/processor.h> 57 58struct exec_domain; 59struct futex_pi_state; 60struct robust_list_head; 61struct bio_list; 62struct fs_struct; 63struct perf_event_context; 64struct blk_plug; 65 66/* 67 * List of flags we want to share for kernel threads, 68 * if only because they are not used by them anyway. 69 */ 70#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 71 72/* 73 * These are the constant used to fake the fixed-point load-average 74 * counting. Some notes: 75 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 76 * a load-average precision of 10 bits integer + 11 bits fractional 77 * - if you want to count load-averages more often, you need more 78 * precision, or rounding will get you. With 2-second counting freq, 79 * the EXP_n values would be 1981, 2034 and 2043 if still using only 80 * 11 bit fractions. 81 */ 82extern unsigned long avenrun[]; /* Load averages */ 83extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); 84 85#define FSHIFT 11 /* nr of bits of precision */ 86#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 87#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ 88#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 89#define EXP_5 2014 /* 1/exp(5sec/5min) */ 90#define EXP_15 2037 /* 1/exp(5sec/15min) */ 91 92#define CALC_LOAD(load,exp,n) \ 93 load *= exp; \ 94 load += n*(FIXED_1-exp); \ 95 load >>= FSHIFT; 96 97extern unsigned long total_forks; 98extern int nr_threads; 99DECLARE_PER_CPU(unsigned long, process_counts); 100extern int nr_processes(void); 101extern unsigned long nr_running(void); 102extern unsigned long nr_iowait(void); 103extern unsigned long nr_iowait_cpu(int cpu); 104extern unsigned long this_cpu_load(void); 105 106 107extern void calc_global_load(unsigned long ticks); 108extern void update_cpu_load_nohz(void); 109 110/* Notifier for when a task gets migrated to a new CPU */ 111struct task_migration_notifier { 112 struct task_struct *task; 113 int from_cpu; 114 int to_cpu; 115}; 116extern void register_task_migration_notifier(struct notifier_block *n); 117 118extern unsigned long get_parent_ip(unsigned long addr); 119 120extern void dump_cpu_task(int cpu); 121 122struct seq_file; 123struct cfs_rq; 124struct task_group; 125#ifdef CONFIG_SCHED_DEBUG 126extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 127extern void proc_sched_set_task(struct task_struct *p); 128extern void 129print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 130#endif 131 132/* 133 * Task state bitmask. NOTE! These bits are also 134 * encoded in fs/proc/array.c: get_task_state(). 135 * 136 * We have two separate sets of flags: task->state 137 * is about runnability, while task->exit_state are 138 * about the task exiting. Confusing, but this way 139 * modifying one set can't modify the other one by 140 * mistake. 141 */ 142#define TASK_RUNNING 0 143#define TASK_INTERRUPTIBLE 1 144#define TASK_UNINTERRUPTIBLE 2 145#define __TASK_STOPPED 4 146#define __TASK_TRACED 8 147/* in tsk->exit_state */ 148#define EXIT_ZOMBIE 16 149#define EXIT_DEAD 32 150/* in tsk->state again */ 151#define TASK_DEAD 64 152#define TASK_WAKEKILL 128 153#define TASK_WAKING 256 154#define TASK_PARKED 512 155#define TASK_STATE_MAX 1024 156 157#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP" 158 159extern char ___assert_task_state[1 - 2*!!( 160 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; 161 162/* Convenience macros for the sake of set_task_state */ 163#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) 164#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) 165#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) 166 167/* Convenience macros for the sake of wake_up */ 168#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 169#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) 170 171/* get_task_state() */ 172#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ 173 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ 174 __TASK_TRACED) 175 176#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) 177#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) 178#define task_is_dead(task) ((task)->exit_state != 0) 179#define task_is_stopped_or_traced(task) \ 180 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) 181#define task_contributes_to_load(task) \ 182 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ 183 (task->flags & PF_FROZEN) == 0) 184 185#define __set_task_state(tsk, state_value) \ 186 do { (tsk)->state = (state_value); } while (0) 187#define set_task_state(tsk, state_value) \ 188 set_mb((tsk)->state, (state_value)) 189 190/* 191 * set_current_state() includes a barrier so that the write of current->state 192 * is correctly serialised wrt the caller's subsequent test of whether to 193 * actually sleep: 194 * 195 * set_current_state(TASK_UNINTERRUPTIBLE); 196 * if (do_i_need_to_sleep()) 197 * schedule(); 198 * 199 * If the caller does not need such serialisation then use __set_current_state() 200 */ 201#define __set_current_state(state_value) \ 202 do { current->state = (state_value); } while (0) 203#define set_current_state(state_value) \ 204 set_mb(current->state, (state_value)) 205 206/* Task command name length */ 207#define TASK_COMM_LEN 16 208 209#include <linux/spinlock.h> 210 211/* 212 * This serializes "schedule()" and also protects 213 * the run-queue from deletions/modifications (but 214 * _adding_ to the beginning of the run-queue has 215 * a separate lock). 216 */ 217extern rwlock_t tasklist_lock; 218extern spinlock_t mmlist_lock; 219 220struct task_struct; 221 222#ifdef CONFIG_PROVE_RCU 223extern int lockdep_tasklist_lock_is_held(void); 224#endif /* #ifdef CONFIG_PROVE_RCU */ 225 226extern void sched_init(void); 227extern void sched_init_smp(void); 228extern asmlinkage void schedule_tail(struct task_struct *prev); 229extern void init_idle(struct task_struct *idle, int cpu); 230extern void init_idle_bootup_task(struct task_struct *idle); 231 232extern int runqueue_is_locked(int cpu); 233 234#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 235extern void nohz_balance_enter_idle(int cpu); 236extern void set_cpu_sd_state_idle(void); 237extern int get_nohz_timer_target(void); 238#else 239static inline void nohz_balance_enter_idle(int cpu) { } 240static inline void set_cpu_sd_state_idle(void) { } 241#endif 242 243/* 244 * Only dump TASK_* tasks. (0 for all tasks) 245 */ 246extern void show_state_filter(unsigned long state_filter); 247 248static inline void show_state(void) 249{ 250 show_state_filter(0); 251} 252 253extern void show_regs(struct pt_regs *); 254 255/* 256 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 257 * task), SP is the stack pointer of the first frame that should be shown in the back 258 * trace (or NULL if the entire call-chain of the task should be shown). 259 */ 260extern void show_stack(struct task_struct *task, unsigned long *sp); 261 262void io_schedule(void); 263long io_schedule_timeout(long timeout); 264 265extern void cpu_init (void); 266extern void trap_init(void); 267extern void update_process_times(int user); 268extern void scheduler_tick(void); 269 270extern void sched_show_task(struct task_struct *p); 271 272#ifdef CONFIG_LOCKUP_DETECTOR 273extern void touch_softlockup_watchdog(void); 274extern void touch_softlockup_watchdog_sync(void); 275extern void touch_all_softlockup_watchdogs(void); 276extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, 277 void __user *buffer, 278 size_t *lenp, loff_t *ppos); 279extern unsigned int softlockup_panic; 280void lockup_detector_init(void); 281#else 282static inline void touch_softlockup_watchdog(void) 283{ 284} 285static inline void touch_softlockup_watchdog_sync(void) 286{ 287} 288static inline void touch_all_softlockup_watchdogs(void) 289{ 290} 291static inline void lockup_detector_init(void) 292{ 293} 294#endif 295 296/* Attach to any functions which should be ignored in wchan output. */ 297#define __sched __attribute__((__section__(".sched.text"))) 298 299/* Linker adds these: start and end of __sched functions */ 300extern char __sched_text_start[], __sched_text_end[]; 301 302/* Is this address in the __sched functions? */ 303extern int in_sched_functions(unsigned long addr); 304 305#define MAX_SCHEDULE_TIMEOUT LONG_MAX 306extern signed long schedule_timeout(signed long timeout); 307extern signed long schedule_timeout_interruptible(signed long timeout); 308extern signed long schedule_timeout_killable(signed long timeout); 309extern signed long schedule_timeout_uninterruptible(signed long timeout); 310asmlinkage void schedule(void); 311extern void schedule_preempt_disabled(void); 312 313struct nsproxy; 314struct user_namespace; 315 316#ifdef CONFIG_MMU 317extern unsigned long mmap_legacy_base(void); 318extern void arch_pick_mmap_layout(struct mm_struct *mm); 319extern unsigned long 320arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 321 unsigned long, unsigned long); 322extern unsigned long 323arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 324 unsigned long len, unsigned long pgoff, 325 unsigned long flags); 326#else 327static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} 328#endif 329 330 331extern void set_dumpable(struct mm_struct *mm, int value); 332extern int get_dumpable(struct mm_struct *mm); 333 334/* mm flags */ 335/* dumpable bits */ 336#define MMF_DUMPABLE 0 /* core dump is permitted */ 337#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 338 339#define MMF_DUMPABLE_BITS 2 340#define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) 341 342/* coredump filter bits */ 343#define MMF_DUMP_ANON_PRIVATE 2 344#define MMF_DUMP_ANON_SHARED 3 345#define MMF_DUMP_MAPPED_PRIVATE 4 346#define MMF_DUMP_MAPPED_SHARED 5 347#define MMF_DUMP_ELF_HEADERS 6 348#define MMF_DUMP_HUGETLB_PRIVATE 7 349#define MMF_DUMP_HUGETLB_SHARED 8 350 351#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 352#define MMF_DUMP_FILTER_BITS 7 353#define MMF_DUMP_FILTER_MASK \ 354 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 355#define MMF_DUMP_FILTER_DEFAULT \ 356 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ 357 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) 358 359#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS 360# define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) 361#else 362# define MMF_DUMP_MASK_DEFAULT_ELF 0 363#endif 364 /* leave room for more dump flags */ 365#define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ 366#define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ 367#define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */ 368 369#define MMF_HAS_UPROBES 19 /* has uprobes */ 370#define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */ 371 372#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) 373 374struct sighand_struct { 375 atomic_t count; 376 struct k_sigaction action[_NSIG]; 377 spinlock_t siglock; 378 wait_queue_head_t signalfd_wqh; 379}; 380 381struct pacct_struct { 382 int ac_flag; 383 long ac_exitcode; 384 unsigned long ac_mem; 385 cputime_t ac_utime, ac_stime; 386 unsigned long ac_minflt, ac_majflt; 387}; 388 389struct cpu_itimer { 390 cputime_t expires; 391 cputime_t incr; 392 u32 error; 393 u32 incr_error; 394}; 395 396/** 397 * struct cputime - snaphsot of system and user cputime 398 * @utime: time spent in user mode 399 * @stime: time spent in system mode 400 * 401 * Gathers a generic snapshot of user and system time. 402 */ 403struct cputime { 404 cputime_t utime; 405 cputime_t stime; 406}; 407 408/** 409 * struct task_cputime - collected CPU time counts 410 * @utime: time spent in user mode, in &cputime_t units 411 * @stime: time spent in kernel mode, in &cputime_t units 412 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds 413 * 414 * This is an extension of struct cputime that includes the total runtime 415 * spent by the task from the scheduler point of view. 416 * 417 * As a result, this structure groups together three kinds of CPU time 418 * that are tracked for threads and thread groups. Most things considering 419 * CPU time want to group these counts together and treat all three 420 * of them in parallel. 421 */ 422struct task_cputime { 423 cputime_t utime; 424 cputime_t stime; 425 unsigned long long sum_exec_runtime; 426}; 427/* Alternate field names when used to cache expirations. */ 428#define prof_exp stime 429#define virt_exp utime 430#define sched_exp sum_exec_runtime 431 432#define INIT_CPUTIME \ 433 (struct task_cputime) { \ 434 .utime = 0, \ 435 .stime = 0, \ 436 .sum_exec_runtime = 0, \ 437 } 438 439/* 440 * Disable preemption until the scheduler is running. 441 * Reset by start_kernel()->sched_init()->init_idle(). 442 * 443 * We include PREEMPT_ACTIVE to avoid cond_resched() from working 444 * before the scheduler is active -- see should_resched(). 445 */ 446#define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) 447 448/** 449 * struct thread_group_cputimer - thread group interval timer counts 450 * @cputime: thread group interval timers. 451 * @running: non-zero when there are timers running and 452 * @cputime receives updates. 453 * @lock: lock for fields in this struct. 454 * 455 * This structure contains the version of task_cputime, above, that is 456 * used for thread group CPU timer calculations. 457 */ 458struct thread_group_cputimer { 459 struct task_cputime cputime; 460 int running; 461 raw_spinlock_t lock; 462}; 463 464#include <linux/rwsem.h> 465struct autogroup; 466 467/* 468 * NOTE! "signal_struct" does not have its own 469 * locking, because a shared signal_struct always 470 * implies a shared sighand_struct, so locking 471 * sighand_struct is always a proper superset of 472 * the locking of signal_struct. 473 */ 474struct signal_struct { 475 atomic_t sigcnt; 476 atomic_t live; 477 int nr_threads; 478 479 wait_queue_head_t wait_chldexit; /* for wait4() */ 480 481 /* current thread group signal load-balancing target: */ 482 struct task_struct *curr_target; 483 484 /* shared signal handling: */ 485 struct sigpending shared_pending; 486 487 /* thread group exit support */ 488 int group_exit_code; 489 /* overloaded: 490 * - notify group_exit_task when ->count is equal to notify_count 491 * - everyone except group_exit_task is stopped during signal delivery 492 * of fatal signals, group_exit_task processes the signal. 493 */ 494 int notify_count; 495 struct task_struct *group_exit_task; 496 497 /* thread group stop support, overloads group_exit_code too */ 498 int group_stop_count; 499 unsigned int flags; /* see SIGNAL_* flags below */ 500 501 /* 502 * PR_SET_CHILD_SUBREAPER marks a process, like a service 503 * manager, to re-parent orphan (double-forking) child processes 504 * to this process instead of 'init'. The service manager is 505 * able to receive SIGCHLD signals and is able to investigate 506 * the process until it calls wait(). All children of this 507 * process will inherit a flag if they should look for a 508 * child_subreaper process at exit. 509 */ 510 unsigned int is_child_subreaper:1; 511 unsigned int has_child_subreaper:1; 512 513 /* POSIX.1b Interval Timers */ 514 int posix_timer_id; 515 struct list_head posix_timers; 516 517 /* ITIMER_REAL timer for the process */ 518 struct hrtimer real_timer; 519 struct pid *leader_pid; 520 ktime_t it_real_incr; 521 522 /* 523 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use 524 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these 525 * values are defined to 0 and 1 respectively 526 */ 527 struct cpu_itimer it[2]; 528 529 /* 530 * Thread group totals for process CPU timers. 531 * See thread_group_cputimer(), et al, for details. 532 */ 533 struct thread_group_cputimer cputimer; 534 535 /* Earliest-expiration cache. */ 536 struct task_cputime cputime_expires; 537 538 struct list_head cpu_timers[3]; 539 540 struct pid *tty_old_pgrp; 541 542 /* boolean value for session group leader */ 543 int leader; 544 545 struct tty_struct *tty; /* NULL if no tty */ 546 547#ifdef CONFIG_SCHED_AUTOGROUP 548 struct autogroup *autogroup; 549#endif 550 /* 551 * Cumulative resource counters for dead threads in the group, 552 * and for reaped dead child processes forked by this group. 553 * Live threads maintain their own counters and add to these 554 * in __exit_signal, except for the group leader. 555 */ 556 cputime_t utime, stime, cutime, cstime; 557 cputime_t gtime; 558 cputime_t cgtime; 559#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 560 struct cputime prev_cputime; 561#endif 562 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 563 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 564 unsigned long inblock, oublock, cinblock, coublock; 565 unsigned long maxrss, cmaxrss; 566 struct task_io_accounting ioac; 567 568 /* 569 * Cumulative ns of schedule CPU time fo dead threads in the 570 * group, not including a zombie group leader, (This only differs 571 * from jiffies_to_ns(utime + stime) if sched_clock uses something 572 * other than jiffies.) 573 */ 574 unsigned long long sum_sched_runtime; 575 576 /* 577 * We don't bother to synchronize most readers of this at all, 578 * because there is no reader checking a limit that actually needs 579 * to get both rlim_cur and rlim_max atomically, and either one 580 * alone is a single word that can safely be read normally. 581 * getrlimit/setrlimit use task_lock(current->group_leader) to 582 * protect this instead of the siglock, because they really 583 * have no need to disable irqs. 584 */ 585 struct rlimit rlim[RLIM_NLIMITS]; 586 587#ifdef CONFIG_BSD_PROCESS_ACCT 588 struct pacct_struct pacct; /* per-process accounting information */ 589#endif 590#ifdef CONFIG_TASKSTATS 591 struct taskstats *stats; 592#endif 593#ifdef CONFIG_AUDIT 594 unsigned audit_tty; 595 unsigned audit_tty_log_passwd; 596 struct tty_audit_buf *tty_audit_buf; 597#endif 598#ifdef CONFIG_CGROUPS 599 /* 600 * group_rwsem prevents new tasks from entering the threadgroup and 601 * member tasks from exiting,a more specifically, setting of 602 * PF_EXITING. fork and exit paths are protected with this rwsem 603 * using threadgroup_change_begin/end(). Users which require 604 * threadgroup to remain stable should use threadgroup_[un]lock() 605 * which also takes care of exec path. Currently, cgroup is the 606 * only user. 607 */ 608 struct rw_semaphore group_rwsem; 609#endif 610 611 oom_flags_t oom_flags; 612 short oom_score_adj; /* OOM kill score adjustment */ 613 short oom_score_adj_min; /* OOM kill score adjustment min value. 614 * Only settable by CAP_SYS_RESOURCE. */ 615 616 struct mutex cred_guard_mutex; /* guard against foreign influences on 617 * credential calculations 618 * (notably. ptrace) */ 619}; 620 621/* 622 * Bits in flags field of signal_struct. 623 */ 624#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 625#define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ 626#define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ 627#define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */ 628/* 629 * Pending notifications to parent. 630 */ 631#define SIGNAL_CLD_STOPPED 0x00000010 632#define SIGNAL_CLD_CONTINUED 0x00000020 633#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) 634 635#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ 636 637/* If true, all threads except ->group_exit_task have pending SIGKILL */ 638static inline int signal_group_exit(const struct signal_struct *sig) 639{ 640 return (sig->flags & SIGNAL_GROUP_EXIT) || 641 (sig->group_exit_task != NULL); 642} 643 644/* 645 * Some day this will be a full-fledged user tracking system.. 646 */ 647struct user_struct { 648 atomic_t __count; /* reference count */ 649 atomic_t processes; /* How many processes does this user have? */ 650 atomic_t files; /* How many open files does this user have? */ 651 atomic_t sigpending; /* How many pending signals does this user have? */ 652#ifdef CONFIG_INOTIFY_USER 653 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 654 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 655#endif 656#ifdef CONFIG_FANOTIFY 657 atomic_t fanotify_listeners; 658#endif 659#ifdef CONFIG_EPOLL 660 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ 661#endif 662#ifdef CONFIG_POSIX_MQUEUE 663 /* protected by mq_lock */ 664 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 665#endif 666 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 667 668#ifdef CONFIG_KEYS 669 struct key *uid_keyring; /* UID specific keyring */ 670 struct key *session_keyring; /* UID's default session keyring */ 671#endif 672 673 /* Hash table maintenance information */ 674 struct hlist_node uidhash_node; 675 kuid_t uid; 676 677#ifdef CONFIG_PERF_EVENTS 678 atomic_long_t locked_vm; 679#endif 680}; 681 682extern int uids_sysfs_init(void); 683 684extern struct user_struct *find_user(kuid_t); 685 686extern struct user_struct root_user; 687#define INIT_USER (&root_user) 688 689 690struct backing_dev_info; 691struct reclaim_state; 692 693#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 694struct sched_info { 695 /* cumulative counters */ 696 unsigned long pcount; /* # of times run on this cpu */ 697 unsigned long long run_delay; /* time spent waiting on a runqueue */ 698 699 /* timestamps */ 700 unsigned long long last_arrival,/* when we last ran on a cpu */ 701 last_queued; /* when we were last queued to run */ 702}; 703#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 704 705#ifdef CONFIG_TASK_DELAY_ACCT 706struct task_delay_info { 707 spinlock_t lock; 708 unsigned int flags; /* Private per-task flags */ 709 710 /* For each stat XXX, add following, aligned appropriately 711 * 712 * struct timespec XXX_start, XXX_end; 713 * u64 XXX_delay; 714 * u32 XXX_count; 715 * 716 * Atomicity of updates to XXX_delay, XXX_count protected by 717 * single lock above (split into XXX_lock if contention is an issue). 718 */ 719 720 /* 721 * XXX_count is incremented on every XXX operation, the delay 722 * associated with the operation is added to XXX_delay. 723 * XXX_delay contains the accumulated delay time in nanoseconds. 724 */ 725 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 726 u64 blkio_delay; /* wait for sync block io completion */ 727 u64 swapin_delay; /* wait for swapin block io completion */ 728 u32 blkio_count; /* total count of the number of sync block */ 729 /* io operations performed */ 730 u32 swapin_count; /* total count of the number of swapin block */ 731 /* io operations performed */ 732 733 struct timespec freepages_start, freepages_end; 734 u64 freepages_delay; /* wait for memory reclaim */ 735 u32 freepages_count; /* total count of memory reclaim */ 736}; 737#endif /* CONFIG_TASK_DELAY_ACCT */ 738 739static inline int sched_info_on(void) 740{ 741#ifdef CONFIG_SCHEDSTATS 742 return 1; 743#elif defined(CONFIG_TASK_DELAY_ACCT) 744 extern int delayacct_on; 745 return delayacct_on; 746#else 747 return 0; 748#endif 749} 750 751enum cpu_idle_type { 752 CPU_IDLE, 753 CPU_NOT_IDLE, 754 CPU_NEWLY_IDLE, 755 CPU_MAX_IDLE_TYPES 756}; 757 758/* 759 * Increase resolution of cpu_power calculations 760 */ 761#define SCHED_POWER_SHIFT 10 762#define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT) 763 764/* 765 * sched-domains (multiprocessor balancing) declarations: 766 */ 767#ifdef CONFIG_SMP 768#define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ 769#define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ 770#define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ 771#define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ 772#define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ 773#define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ 774#define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ 775#define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ 776#define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ 777#define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ 778#define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ 779#define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ 780 781extern int __weak arch_sd_sibiling_asym_packing(void); 782 783struct sched_domain_attr { 784 int relax_domain_level; 785}; 786 787#define SD_ATTR_INIT (struct sched_domain_attr) { \ 788 .relax_domain_level = -1, \ 789} 790 791extern int sched_domain_level_max; 792 793struct sched_group; 794 795struct sched_domain { 796 /* These fields must be setup */ 797 struct sched_domain *parent; /* top domain must be null terminated */ 798 struct sched_domain *child; /* bottom domain must be null terminated */ 799 struct sched_group *groups; /* the balancing groups of the domain */ 800 unsigned long min_interval; /* Minimum balance interval ms */ 801 unsigned long max_interval; /* Maximum balance interval ms */ 802 unsigned int busy_factor; /* less balancing by factor if busy */ 803 unsigned int imbalance_pct; /* No balance until over watermark */ 804 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 805 unsigned int busy_idx; 806 unsigned int idle_idx; 807 unsigned int newidle_idx; 808 unsigned int wake_idx; 809 unsigned int forkexec_idx; 810 unsigned int smt_gain; 811 812 int nohz_idle; /* NOHZ IDLE status */ 813 int flags; /* See SD_* */ 814 int level; 815 816 /* Runtime fields. */ 817 unsigned long last_balance; /* init to jiffies. units in jiffies */ 818 unsigned int balance_interval; /* initialise to 1. units in ms. */ 819 unsigned int nr_balance_failed; /* initialise to 0 */ 820 821 u64 last_update; 822 823#ifdef CONFIG_SCHEDSTATS 824 /* load_balance() stats */ 825 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 826 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 827 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 828 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 829 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 830 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 831 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 832 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 833 834 /* Active load balancing */ 835 unsigned int alb_count; 836 unsigned int alb_failed; 837 unsigned int alb_pushed; 838 839 /* SD_BALANCE_EXEC stats */ 840 unsigned int sbe_count; 841 unsigned int sbe_balanced; 842 unsigned int sbe_pushed; 843 844 /* SD_BALANCE_FORK stats */ 845 unsigned int sbf_count; 846 unsigned int sbf_balanced; 847 unsigned int sbf_pushed; 848 849 /* try_to_wake_up() stats */ 850 unsigned int ttwu_wake_remote; 851 unsigned int ttwu_move_affine; 852 unsigned int ttwu_move_balance; 853#endif 854#ifdef CONFIG_SCHED_DEBUG 855 char *name; 856#endif 857 union { 858 void *private; /* used during construction */ 859 struct rcu_head rcu; /* used during destruction */ 860 }; 861 862 unsigned int span_weight; 863 /* 864 * Span of all CPUs in this domain. 865 * 866 * NOTE: this field is variable length. (Allocated dynamically 867 * by attaching extra space to the end of the structure, 868 * depending on how many CPUs the kernel has booted up with) 869 */ 870 unsigned long span[0]; 871}; 872 873static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 874{ 875 return to_cpumask(sd->span); 876} 877 878extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 879 struct sched_domain_attr *dattr_new); 880 881/* Allocate an array of sched domains, for partition_sched_domains(). */ 882cpumask_var_t *alloc_sched_domains(unsigned int ndoms); 883void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); 884 885bool cpus_share_cache(int this_cpu, int that_cpu); 886 887#else /* CONFIG_SMP */ 888 889struct sched_domain_attr; 890 891static inline void 892partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 893 struct sched_domain_attr *dattr_new) 894{ 895} 896 897static inline bool cpus_share_cache(int this_cpu, int that_cpu) 898{ 899 return true; 900} 901 902#endif /* !CONFIG_SMP */ 903 904 905struct io_context; /* See blkdev.h */ 906 907 908#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 909extern void prefetch_stack(struct task_struct *t); 910#else 911static inline void prefetch_stack(struct task_struct *t) { } 912#endif 913 914struct audit_context; /* See audit.c */ 915struct mempolicy; 916struct pipe_inode_info; 917struct uts_namespace; 918 919struct load_weight { 920 unsigned long weight, inv_weight; 921}; 922 923struct sched_avg { 924 /* 925 * These sums represent an infinite geometric series and so are bound 926 * above by 1024/(1-y). Thus we only need a u32 to store them for all 927 * choices of y < 1-2^(-32)*1024. 928 */ 929 u32 runnable_avg_sum, runnable_avg_period; 930 u64 last_runnable_update; 931 s64 decay_count; 932 unsigned long load_avg_contrib; 933}; 934 935#ifdef CONFIG_SCHEDSTATS 936struct sched_statistics { 937 u64 wait_start; 938 u64 wait_max; 939 u64 wait_count; 940 u64 wait_sum; 941 u64 iowait_count; 942 u64 iowait_sum; 943 944 u64 sleep_start; 945 u64 sleep_max; 946 s64 sum_sleep_runtime; 947 948 u64 block_start; 949 u64 block_max; 950 u64 exec_max; 951 u64 slice_max; 952 953 u64 nr_migrations_cold; 954 u64 nr_failed_migrations_affine; 955 u64 nr_failed_migrations_running; 956 u64 nr_failed_migrations_hot; 957 u64 nr_forced_migrations; 958 959 u64 nr_wakeups; 960 u64 nr_wakeups_sync; 961 u64 nr_wakeups_migrate; 962 u64 nr_wakeups_local; 963 u64 nr_wakeups_remote; 964 u64 nr_wakeups_affine; 965 u64 nr_wakeups_affine_attempts; 966 u64 nr_wakeups_passive; 967 u64 nr_wakeups_idle; 968}; 969#endif 970 971struct sched_entity { 972 struct load_weight load; /* for load-balancing */ 973 struct rb_node run_node; 974 struct list_head group_node; 975 unsigned int on_rq; 976 977 u64 exec_start; 978 u64 sum_exec_runtime; 979 u64 vruntime; 980 u64 prev_sum_exec_runtime; 981 982 u64 nr_migrations; 983 984#ifdef CONFIG_SCHEDSTATS 985 struct sched_statistics statistics; 986#endif 987 988#ifdef CONFIG_FAIR_GROUP_SCHED 989 struct sched_entity *parent; 990 /* rq on which this entity is (to be) queued: */ 991 struct cfs_rq *cfs_rq; 992 /* rq "owned" by this entity/group: */ 993 struct cfs_rq *my_q; 994#endif 995 996#ifdef CONFIG_SMP 997 /* Per-entity load-tracking */ 998 struct sched_avg avg; 999#endif 1000}; 1001 1002struct sched_rt_entity { 1003 struct list_head run_list; 1004 unsigned long timeout; 1005 unsigned long watchdog_stamp; 1006 unsigned int time_slice; 1007 1008 struct sched_rt_entity *back; 1009#ifdef CONFIG_RT_GROUP_SCHED 1010 struct sched_rt_entity *parent; 1011 /* rq on which this entity is (to be) queued: */ 1012 struct rt_rq *rt_rq; 1013 /* rq "owned" by this entity/group: */ 1014 struct rt_rq *my_q; 1015#endif 1016}; 1017 1018 1019struct rcu_node; 1020 1021enum perf_event_task_context { 1022 perf_invalid_context = -1, 1023 perf_hw_context = 0, 1024 perf_sw_context, 1025 perf_nr_task_contexts, 1026}; 1027 1028struct task_struct { 1029 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 1030 void *stack; 1031 atomic_t usage; 1032 unsigned int flags; /* per process flags, defined below */ 1033 unsigned int ptrace; 1034 1035#ifdef CONFIG_SMP 1036 struct llist_node wake_entry; 1037 int on_cpu; 1038#endif 1039 int on_rq; 1040 1041 int prio, static_prio, normal_prio; 1042 unsigned int rt_priority; 1043 const struct sched_class *sched_class; 1044 struct sched_entity se; 1045 struct sched_rt_entity rt; 1046#ifdef CONFIG_CGROUP_SCHED 1047 struct task_group *sched_task_group; 1048#endif 1049 1050#ifdef CONFIG_PREEMPT_NOTIFIERS 1051 /* list of struct preempt_notifier: */ 1052 struct hlist_head preempt_notifiers; 1053#endif 1054 1055 /* 1056 * fpu_counter contains the number of consecutive context switches 1057 * that the FPU is used. If this is over a threshold, the lazy fpu 1058 * saving becomes unlazy to save the trap. This is an unsigned char 1059 * so that after 256 times the counter wraps and the behavior turns 1060 * lazy again; this to deal with bursty apps that only use FPU for 1061 * a short time 1062 */ 1063 unsigned char fpu_counter; 1064#ifdef CONFIG_BLK_DEV_IO_TRACE 1065 unsigned int btrace_seq; 1066#endif 1067 1068 unsigned int policy; 1069 int nr_cpus_allowed; 1070 cpumask_t cpus_allowed; 1071 1072#ifdef CONFIG_PREEMPT_RCU 1073 int rcu_read_lock_nesting; 1074 char rcu_read_unlock_special; 1075 struct list_head rcu_node_entry; 1076#endif /* #ifdef CONFIG_PREEMPT_RCU */ 1077#ifdef CONFIG_TREE_PREEMPT_RCU 1078 struct rcu_node *rcu_blocked_node; 1079#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ 1080#ifdef CONFIG_RCU_BOOST 1081 struct rt_mutex *rcu_boost_mutex; 1082#endif /* #ifdef CONFIG_RCU_BOOST */ 1083 1084#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 1085 struct sched_info sched_info; 1086#endif 1087 1088 struct list_head tasks; 1089#ifdef CONFIG_SMP 1090 struct plist_node pushable_tasks; 1091#endif 1092 1093 struct mm_struct *mm, *active_mm; 1094#ifdef CONFIG_COMPAT_BRK 1095 unsigned brk_randomized:1; 1096#endif 1097#if defined(SPLIT_RSS_COUNTING) 1098 struct task_rss_stat rss_stat; 1099#endif 1100/* task state */ 1101 int exit_state; 1102 int exit_code, exit_signal; 1103 int pdeath_signal; /* The signal sent when the parent dies */ 1104 unsigned int jobctl; /* JOBCTL_*, siglock protected */ 1105 1106 /* Used for emulating ABI behavior of previous Linux versions */ 1107 unsigned int personality; 1108 1109 unsigned did_exec:1; 1110 unsigned in_execve:1; /* Tell the LSMs that the process is doing an 1111 * execve */ 1112 unsigned in_iowait:1; 1113 1114 /* task may not gain privileges */ 1115 unsigned no_new_privs:1; 1116 1117 /* Revert to default priority/policy when forking */ 1118 unsigned sched_reset_on_fork:1; 1119 unsigned sched_contributes_to_load:1; 1120 1121 pid_t pid; 1122 pid_t tgid; 1123 1124#ifdef CONFIG_CC_STACKPROTECTOR 1125 /* Canary value for the -fstack-protector gcc feature */ 1126 unsigned long stack_canary; 1127#endif 1128 /* 1129 * pointers to (original) parent process, youngest child, younger sibling, 1130 * older sibling, respectively. (p->father can be replaced with 1131 * p->real_parent->pid) 1132 */ 1133 struct task_struct __rcu *real_parent; /* real parent process */ 1134 struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ 1135 /* 1136 * children/sibling forms the list of my natural children 1137 */ 1138 struct list_head children; /* list of my children */ 1139 struct list_head sibling; /* linkage in my parent's children list */ 1140 struct task_struct *group_leader; /* threadgroup leader */ 1141 1142 /* 1143 * ptraced is the list of tasks this task is using ptrace on. 1144 * This includes both natural children and PTRACE_ATTACH targets. 1145 * p->ptrace_entry is p's link on the p->parent->ptraced list. 1146 */ 1147 struct list_head ptraced; 1148 struct list_head ptrace_entry; 1149 1150 /* PID/PID hash table linkage. */ 1151 struct pid_link pids[PIDTYPE_MAX]; 1152 struct list_head thread_group; 1153 1154 struct completion *vfork_done; /* for vfork() */ 1155 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1156 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1157 1158 cputime_t utime, stime, utimescaled, stimescaled; 1159 cputime_t gtime; 1160#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 1161 struct cputime prev_cputime; 1162#endif 1163#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN 1164 seqlock_t vtime_seqlock; 1165 unsigned long long vtime_snap; 1166 enum { 1167 VTIME_SLEEPING = 0, 1168 VTIME_USER, 1169 VTIME_SYS, 1170 } vtime_snap_whence; 1171#endif 1172 unsigned long nvcsw, nivcsw; /* context switch counts */ 1173 struct timespec start_time; /* monotonic time */ 1174 struct timespec real_start_time; /* boot based time */ 1175/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1176 unsigned long min_flt, maj_flt; 1177 1178 struct task_cputime cputime_expires; 1179 struct list_head cpu_timers[3]; 1180 1181/* process credentials */ 1182 const struct cred __rcu *real_cred; /* objective and real subjective task 1183 * credentials (COW) */ 1184 const struct cred __rcu *cred; /* effective (overridable) subjective task 1185 * credentials (COW) */ 1186 char comm[TASK_COMM_LEN]; /* executable name excluding path 1187 - access with [gs]et_task_comm (which lock 1188 it with task_lock()) 1189 - initialized normally by setup_new_exec */ 1190/* file system info */ 1191 int link_count, total_link_count; 1192#ifdef CONFIG_SYSVIPC 1193/* ipc stuff */ 1194 struct sysv_sem sysvsem; 1195#endif 1196#ifdef CONFIG_DETECT_HUNG_TASK 1197/* hung task detection */ 1198 unsigned long last_switch_count; 1199#endif 1200/* CPU-specific state of this task */ 1201 struct thread_struct thread; 1202/* filesystem information */ 1203 struct fs_struct *fs; 1204/* open file information */ 1205 struct files_struct *files; 1206/* namespaces */ 1207 struct nsproxy *nsproxy; 1208/* signal handlers */ 1209 struct signal_struct *signal; 1210 struct sighand_struct *sighand; 1211 1212 sigset_t blocked, real_blocked; 1213 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ 1214 struct sigpending pending; 1215 1216 unsigned long sas_ss_sp; 1217 size_t sas_ss_size; 1218 int (*notifier)(void *priv); 1219 void *notifier_data; 1220 sigset_t *notifier_mask; 1221 struct callback_head *task_works; 1222 1223 struct audit_context *audit_context; 1224#ifdef CONFIG_AUDITSYSCALL 1225 kuid_t loginuid; 1226 unsigned int sessionid; 1227#endif 1228 struct seccomp seccomp; 1229 1230/* Thread group tracking */ 1231 u32 parent_exec_id; 1232 u32 self_exec_id; 1233/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, 1234 * mempolicy */ 1235 spinlock_t alloc_lock; 1236 1237 /* Protection of the PI data structures: */ 1238 raw_spinlock_t pi_lock; 1239 1240#ifdef CONFIG_RT_MUTEXES 1241 /* PI waiters blocked on a rt_mutex held by this task */ 1242 struct plist_head pi_waiters; 1243 /* Deadlock detection and priority inheritance handling */ 1244 struct rt_mutex_waiter *pi_blocked_on; 1245#endif 1246 1247#ifdef CONFIG_DEBUG_MUTEXES 1248 /* mutex deadlock detection */ 1249 struct mutex_waiter *blocked_on; 1250#endif 1251#ifdef CONFIG_TRACE_IRQFLAGS 1252 unsigned int irq_events; 1253 unsigned long hardirq_enable_ip; 1254 unsigned long hardirq_disable_ip; 1255 unsigned int hardirq_enable_event; 1256 unsigned int hardirq_disable_event; 1257 int hardirqs_enabled; 1258 int hardirq_context; 1259 unsigned long softirq_disable_ip; 1260 unsigned long softirq_enable_ip; 1261 unsigned int softirq_disable_event; 1262 unsigned int softirq_enable_event; 1263 int softirqs_enabled; 1264 int softirq_context; 1265#endif 1266#ifdef CONFIG_LOCKDEP 1267# define MAX_LOCK_DEPTH 48UL 1268 u64 curr_chain_key; 1269 int lockdep_depth; 1270 unsigned int lockdep_recursion; 1271 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1272 gfp_t lockdep_reclaim_gfp; 1273#endif 1274 1275/* journalling filesystem info */ 1276 void *journal_info; 1277 1278/* stacked block device info */ 1279 struct bio_list *bio_list; 1280 1281#ifdef CONFIG_BLOCK 1282/* stack plugging */ 1283 struct blk_plug *plug; 1284#endif 1285 1286/* VM state */ 1287 struct reclaim_state *reclaim_state; 1288 1289 struct backing_dev_info *backing_dev_info; 1290 1291 struct io_context *io_context; 1292 1293 unsigned long ptrace_message; 1294 siginfo_t *last_siginfo; /* For ptrace use. */ 1295 struct task_io_accounting ioac; 1296#if defined(CONFIG_TASK_XACCT) 1297 u64 acct_rss_mem1; /* accumulated rss usage */ 1298 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1299 cputime_t acct_timexpd; /* stime + utime since last update */ 1300#endif 1301#ifdef CONFIG_CPUSETS 1302 nodemask_t mems_allowed; /* Protected by alloc_lock */ 1303 seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ 1304 int cpuset_mem_spread_rotor; 1305 int cpuset_slab_spread_rotor; 1306#endif 1307#ifdef CONFIG_CGROUPS 1308 /* Control Group info protected by css_set_lock */ 1309 struct css_set __rcu *cgroups; 1310 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1311 struct list_head cg_list; 1312#endif 1313#ifdef CONFIG_FUTEX 1314 struct robust_list_head __user *robust_list; 1315#ifdef CONFIG_COMPAT 1316 struct compat_robust_list_head __user *compat_robust_list; 1317#endif 1318 struct list_head pi_state_list; 1319 struct futex_pi_state *pi_state_cache; 1320#endif 1321#ifdef CONFIG_PERF_EVENTS 1322 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; 1323 struct mutex perf_event_mutex; 1324 struct list_head perf_event_list; 1325#endif 1326#ifdef CONFIG_NUMA 1327 struct mempolicy *mempolicy; /* Protected by alloc_lock */ 1328 short il_next; 1329 short pref_node_fork; 1330#endif 1331#ifdef CONFIG_NUMA_BALANCING 1332 int numa_scan_seq; 1333 int numa_migrate_seq; 1334 unsigned int numa_scan_period; 1335 u64 node_stamp; /* migration stamp */ 1336 struct callback_head numa_work; 1337#endif /* CONFIG_NUMA_BALANCING */ 1338 1339 struct rcu_head rcu; 1340 1341 /* 1342 * cache last used pipe for splice 1343 */ 1344 struct pipe_inode_info *splice_pipe; 1345 1346 struct page_frag task_frag; 1347 1348#ifdef CONFIG_TASK_DELAY_ACCT 1349 struct task_delay_info *delays; 1350#endif 1351#ifdef CONFIG_FAULT_INJECTION 1352 int make_it_fail; 1353#endif 1354 /* 1355 * when (nr_dirtied >= nr_dirtied_pause), it's time to call 1356 * balance_dirty_pages() for some dirty throttling pause 1357 */ 1358 int nr_dirtied; 1359 int nr_dirtied_pause; 1360 unsigned long dirty_paused_when; /* start of a write-and-pause period */ 1361 1362#ifdef CONFIG_LATENCYTOP 1363 int latency_record_count; 1364 struct latency_record latency_record[LT_SAVECOUNT]; 1365#endif 1366 /* 1367 * time slack values; these are used to round up poll() and 1368 * select() etc timeout values. These are in nanoseconds. 1369 */ 1370 unsigned long timer_slack_ns; 1371 unsigned long default_timer_slack_ns; 1372 1373#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1374 /* Index of current stored address in ret_stack */ 1375 int curr_ret_stack; 1376 /* Stack of return addresses for return function tracing */ 1377 struct ftrace_ret_stack *ret_stack; 1378 /* time stamp for last schedule */ 1379 unsigned long long ftrace_timestamp; 1380 /* 1381 * Number of functions that haven't been traced 1382 * because of depth overrun. 1383 */ 1384 atomic_t trace_overrun; 1385 /* Pause for the tracing */ 1386 atomic_t tracing_graph_pause; 1387#endif 1388#ifdef CONFIG_TRACING 1389 /* state flags for use by tracers */ 1390 unsigned long trace; 1391 /* bitmask and counter of trace recursion */ 1392 unsigned long trace_recursion; 1393#endif /* CONFIG_TRACING */ 1394#ifdef CONFIG_MEMCG /* memcg uses this to do batch job */ 1395 struct memcg_batch_info { 1396 int do_batch; /* incremented when batch uncharge started */ 1397 struct mem_cgroup *memcg; /* target memcg of uncharge */ 1398 unsigned long nr_pages; /* uncharged usage */ 1399 unsigned long memsw_nr_pages; /* uncharged mem+swap usage */ 1400 } memcg_batch; 1401 unsigned int memcg_kmem_skip_account; 1402#endif 1403#ifdef CONFIG_UPROBES 1404 struct uprobe_task *utask; 1405#endif 1406#if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) 1407 unsigned int sequential_io; 1408 unsigned int sequential_io_avg; 1409#endif 1410}; 1411 1412/* Future-safe accessor for struct task_struct's cpus_allowed. */ 1413#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) 1414 1415#ifdef CONFIG_NUMA_BALANCING 1416extern void task_numa_fault(int node, int pages, bool migrated); 1417extern void set_numabalancing_state(bool enabled); 1418#else 1419static inline void task_numa_fault(int node, int pages, bool migrated) 1420{ 1421} 1422static inline void set_numabalancing_state(bool enabled) 1423{ 1424} 1425#endif 1426 1427static inline struct pid *task_pid(struct task_struct *task) 1428{ 1429 return task->pids[PIDTYPE_PID].pid; 1430} 1431 1432static inline struct pid *task_tgid(struct task_struct *task) 1433{ 1434 return task->group_leader->pids[PIDTYPE_PID].pid; 1435} 1436 1437/* 1438 * Without tasklist or rcu lock it is not safe to dereference 1439 * the result of task_pgrp/task_session even if task == current, 1440 * we can race with another thread doing sys_setsid/sys_setpgid. 1441 */ 1442static inline struct pid *task_pgrp(struct task_struct *task) 1443{ 1444 return task->group_leader->pids[PIDTYPE_PGID].pid; 1445} 1446 1447static inline struct pid *task_session(struct task_struct *task) 1448{ 1449 return task->group_leader->pids[PIDTYPE_SID].pid; 1450} 1451 1452struct pid_namespace; 1453 1454/* 1455 * the helpers to get the task's different pids as they are seen 1456 * from various namespaces 1457 * 1458 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1459 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 1460 * current. 1461 * task_xid_nr_ns() : id seen from the ns specified; 1462 * 1463 * set_task_vxid() : assigns a virtual id to a task; 1464 * 1465 * see also pid_nr() etc in include/linux/pid.h 1466 */ 1467pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, 1468 struct pid_namespace *ns); 1469 1470static inline pid_t task_pid_nr(struct task_struct *tsk) 1471{ 1472 return tsk->pid; 1473} 1474 1475static inline pid_t task_pid_nr_ns(struct task_struct *tsk, 1476 struct pid_namespace *ns) 1477{ 1478 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); 1479} 1480 1481static inline pid_t task_pid_vnr(struct task_struct *tsk) 1482{ 1483 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); 1484} 1485 1486 1487static inline pid_t task_tgid_nr(struct task_struct *tsk) 1488{ 1489 return tsk->tgid; 1490} 1491 1492pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1493 1494static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1495{ 1496 return pid_vnr(task_tgid(tsk)); 1497} 1498 1499 1500static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, 1501 struct pid_namespace *ns) 1502{ 1503 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); 1504} 1505 1506static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1507{ 1508 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); 1509} 1510 1511 1512static inline pid_t task_session_nr_ns(struct task_struct *tsk, 1513 struct pid_namespace *ns) 1514{ 1515 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); 1516} 1517 1518static inline pid_t task_session_vnr(struct task_struct *tsk) 1519{ 1520 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); 1521} 1522 1523/* obsolete, do not use */ 1524static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1525{ 1526 return task_pgrp_nr_ns(tsk, &init_pid_ns); 1527} 1528 1529/** 1530 * pid_alive - check that a task structure is not stale 1531 * @p: Task structure to be checked. 1532 * 1533 * Test if a process is not yet dead (at most zombie state) 1534 * If pid_alive fails, then pointers within the task structure 1535 * can be stale and must not be dereferenced. 1536 */ 1537static inline int pid_alive(struct task_struct *p) 1538{ 1539 return p->pids[PIDTYPE_PID].pid != NULL; 1540} 1541 1542/** 1543 * is_global_init - check if a task structure is init 1544 * @tsk: Task structure to be checked. 1545 * 1546 * Check if a task structure is the first user space task the kernel created. 1547 */ 1548static inline int is_global_init(struct task_struct *tsk) 1549{ 1550 return tsk->pid == 1; 1551} 1552 1553extern struct pid *cad_pid; 1554 1555extern void free_task(struct task_struct *tsk); 1556#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1557 1558extern void __put_task_struct(struct task_struct *t); 1559 1560static inline void put_task_struct(struct task_struct *t) 1561{ 1562 if (atomic_dec_and_test(&t->usage)) 1563 __put_task_struct(t); 1564} 1565 1566#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN 1567extern void task_cputime(struct task_struct *t, 1568 cputime_t *utime, cputime_t *stime); 1569extern void task_cputime_scaled(struct task_struct *t, 1570 cputime_t *utimescaled, cputime_t *stimescaled); 1571extern cputime_t task_gtime(struct task_struct *t); 1572#else 1573static inline void task_cputime(struct task_struct *t, 1574 cputime_t *utime, cputime_t *stime) 1575{ 1576 if (utime) 1577 *utime = t->utime; 1578 if (stime) 1579 *stime = t->stime; 1580} 1581 1582static inline void task_cputime_scaled(struct task_struct *t, 1583 cputime_t *utimescaled, 1584 cputime_t *stimescaled) 1585{ 1586 if (utimescaled) 1587 *utimescaled = t->utimescaled; 1588 if (stimescaled) 1589 *stimescaled = t->stimescaled; 1590} 1591 1592static inline cputime_t task_gtime(struct task_struct *t) 1593{ 1594 return t->gtime; 1595} 1596#endif 1597extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); 1598extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st); 1599 1600/* 1601 * Per process flags 1602 */ 1603#define PF_EXITING 0x00000004 /* getting shut down */ 1604#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1605#define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1606#define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ 1607#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1608#define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ 1609#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1610#define PF_DUMPCORE 0x00000200 /* dumped core */ 1611#define PF_SIGNALED 0x00000400 /* killed by a signal */ 1612#define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1613#define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ 1614#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1615#define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */ 1616#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1617#define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1618#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1619#define PF_KSWAPD 0x00040000 /* I am kswapd */ 1620#define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */ 1621#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1622#define PF_KTHREAD 0x00200000 /* I am a kernel thread */ 1623#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1624#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1625#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1626#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1627#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ 1628#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ 1629#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1630#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1631#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ 1632#define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */ 1633 1634/* 1635 * Only the _current_ task can read/write to tsk->flags, but other 1636 * tasks can access tsk->flags in readonly mode for example 1637 * with tsk_used_math (like during threaded core dumping). 1638 * There is however an exception to this rule during ptrace 1639 * or during fork: the ptracer task is allowed to write to the 1640 * child->flags of its traced child (same goes for fork, the parent 1641 * can write to the child->flags), because we're guaranteed the 1642 * child is not running and in turn not changing child->flags 1643 * at the same time the parent does it. 1644 */ 1645#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1646#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1647#define clear_used_math() clear_stopped_child_used_math(current) 1648#define set_used_math() set_stopped_child_used_math(current) 1649#define conditional_stopped_child_used_math(condition, child) \ 1650 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1651#define conditional_used_math(condition) \ 1652 conditional_stopped_child_used_math(condition, current) 1653#define copy_to_stopped_child_used_math(child) \ 1654 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1655/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1656#define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1657#define used_math() tsk_used_math(current) 1658 1659/* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags */ 1660static inline gfp_t memalloc_noio_flags(gfp_t flags) 1661{ 1662 if (unlikely(current->flags & PF_MEMALLOC_NOIO)) 1663 flags &= ~__GFP_IO; 1664 return flags; 1665} 1666 1667static inline unsigned int memalloc_noio_save(void) 1668{ 1669 unsigned int flags = current->flags & PF_MEMALLOC_NOIO; 1670 current->flags |= PF_MEMALLOC_NOIO; 1671 return flags; 1672} 1673 1674static inline void memalloc_noio_restore(unsigned int flags) 1675{ 1676 current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags; 1677} 1678 1679/* 1680 * task->jobctl flags 1681 */ 1682#define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ 1683 1684#define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */ 1685#define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */ 1686#define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */ 1687#define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */ 1688#define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */ 1689#define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */ 1690#define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ 1691 1692#define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT) 1693#define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT) 1694#define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT) 1695#define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT) 1696#define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT) 1697#define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT) 1698#define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT) 1699 1700#define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY) 1701#define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK) 1702 1703extern bool task_set_jobctl_pending(struct task_struct *task, 1704 unsigned int mask); 1705extern void task_clear_jobctl_trapping(struct task_struct *task); 1706extern void task_clear_jobctl_pending(struct task_struct *task, 1707 unsigned int mask); 1708 1709#ifdef CONFIG_PREEMPT_RCU 1710 1711#define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ 1712#define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ 1713 1714static inline void rcu_copy_process(struct task_struct *p) 1715{ 1716 p->rcu_read_lock_nesting = 0; 1717 p->rcu_read_unlock_special = 0; 1718#ifdef CONFIG_TREE_PREEMPT_RCU 1719 p->rcu_blocked_node = NULL; 1720#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ 1721#ifdef CONFIG_RCU_BOOST 1722 p->rcu_boost_mutex = NULL; 1723#endif /* #ifdef CONFIG_RCU_BOOST */ 1724 INIT_LIST_HEAD(&p->rcu_node_entry); 1725} 1726 1727#else 1728 1729static inline void rcu_copy_process(struct task_struct *p) 1730{ 1731} 1732 1733#endif 1734 1735static inline void tsk_restore_flags(struct task_struct *task, 1736 unsigned long orig_flags, unsigned long flags) 1737{ 1738 task->flags &= ~flags; 1739 task->flags |= orig_flags & flags; 1740} 1741 1742#ifdef CONFIG_SMP 1743extern void do_set_cpus_allowed(struct task_struct *p, 1744 const struct cpumask *new_mask); 1745 1746extern int set_cpus_allowed_ptr(struct task_struct *p, 1747 const struct cpumask *new_mask); 1748#else 1749static inline void do_set_cpus_allowed(struct task_struct *p, 1750 const struct cpumask *new_mask) 1751{ 1752} 1753static inline int set_cpus_allowed_ptr(struct task_struct *p, 1754 const struct cpumask *new_mask) 1755{ 1756 if (!cpumask_test_cpu(0, new_mask)) 1757 return -EINVAL; 1758 return 0; 1759} 1760#endif 1761 1762#ifdef CONFIG_NO_HZ_COMMON 1763void calc_load_enter_idle(void); 1764void calc_load_exit_idle(void); 1765#else 1766static inline void calc_load_enter_idle(void) { } 1767static inline void calc_load_exit_idle(void) { } 1768#endif /* CONFIG_NO_HZ_COMMON */ 1769 1770#ifndef CONFIG_CPUMASK_OFFSTACK 1771static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1772{ 1773 return set_cpus_allowed_ptr(p, &new_mask); 1774} 1775#endif 1776 1777/* 1778 * Do not use outside of architecture code which knows its limitations. 1779 * 1780 * sched_clock() has no promise of monotonicity or bounded drift between 1781 * CPUs, use (which you should not) requires disabling IRQs. 1782 * 1783 * Please use one of the three interfaces below. 1784 */ 1785extern unsigned long long notrace sched_clock(void); 1786/* 1787 * See the comment in kernel/sched/clock.c 1788 */ 1789extern u64 cpu_clock(int cpu); 1790extern u64 local_clock(void); 1791extern u64 sched_clock_cpu(int cpu); 1792 1793 1794extern void sched_clock_init(void); 1795 1796#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1797static inline void sched_clock_tick(void) 1798{ 1799} 1800 1801static inline void sched_clock_idle_sleep_event(void) 1802{ 1803} 1804 1805static inline void sched_clock_idle_wakeup_event(u64 delta_ns) 1806{ 1807} 1808#else 1809/* 1810 * Architectures can set this to 1 if they have specified 1811 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, 1812 * but then during bootup it turns out that sched_clock() 1813 * is reliable after all: 1814 */ 1815extern int sched_clock_stable; 1816 1817extern void sched_clock_tick(void); 1818extern void sched_clock_idle_sleep_event(void); 1819extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1820#endif 1821 1822#ifdef CONFIG_IRQ_TIME_ACCOUNTING 1823/* 1824 * An i/f to runtime opt-in for irq time accounting based off of sched_clock. 1825 * The reason for this explicit opt-in is not to have perf penalty with 1826 * slow sched_clocks. 1827 */ 1828extern void enable_sched_clock_irqtime(void); 1829extern void disable_sched_clock_irqtime(void); 1830#else 1831static inline void enable_sched_clock_irqtime(void) {} 1832static inline void disable_sched_clock_irqtime(void) {} 1833#endif 1834 1835extern unsigned long long 1836task_sched_runtime(struct task_struct *task); 1837 1838/* sched_exec is called by processes performing an exec */ 1839#ifdef CONFIG_SMP 1840extern void sched_exec(void); 1841#else 1842#define sched_exec() {} 1843#endif 1844 1845extern void sched_clock_idle_sleep_event(void); 1846extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1847 1848#ifdef CONFIG_HOTPLUG_CPU 1849extern void idle_task_exit(void); 1850#else 1851static inline void idle_task_exit(void) {} 1852#endif 1853 1854#if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP) 1855extern void wake_up_nohz_cpu(int cpu); 1856#else 1857static inline void wake_up_nohz_cpu(int cpu) { } 1858#endif 1859 1860#ifdef CONFIG_NO_HZ_FULL 1861extern bool sched_can_stop_tick(void); 1862extern u64 scheduler_tick_max_deferment(void); 1863#else 1864static inline bool sched_can_stop_tick(void) { return false; } 1865#endif 1866 1867#ifdef CONFIG_SCHED_AUTOGROUP 1868extern void sched_autogroup_create_attach(struct task_struct *p); 1869extern void sched_autogroup_detach(struct task_struct *p); 1870extern void sched_autogroup_fork(struct signal_struct *sig); 1871extern void sched_autogroup_exit(struct signal_struct *sig); 1872#ifdef CONFIG_PROC_FS 1873extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); 1874extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice); 1875#endif 1876#else 1877static inline void sched_autogroup_create_attach(struct task_struct *p) { } 1878static inline void sched_autogroup_detach(struct task_struct *p) { } 1879static inline void sched_autogroup_fork(struct signal_struct *sig) { } 1880static inline void sched_autogroup_exit(struct signal_struct *sig) { } 1881#endif 1882 1883extern bool yield_to(struct task_struct *p, bool preempt); 1884extern void set_user_nice(struct task_struct *p, long nice); 1885extern int task_prio(const struct task_struct *p); 1886extern int task_nice(const struct task_struct *p); 1887extern int can_nice(const struct task_struct *p, const int nice); 1888extern int task_curr(const struct task_struct *p); 1889extern int idle_cpu(int cpu); 1890extern int sched_setscheduler(struct task_struct *, int, 1891 const struct sched_param *); 1892extern int sched_setscheduler_nocheck(struct task_struct *, int, 1893 const struct sched_param *); 1894extern struct task_struct *idle_task(int cpu); 1895/** 1896 * is_idle_task - is the specified task an idle task? 1897 * @p: the task in question. 1898 */ 1899static inline bool is_idle_task(const struct task_struct *p) 1900{ 1901 return p->pid == 0; 1902} 1903extern struct task_struct *curr_task(int cpu); 1904extern void set_curr_task(int cpu, struct task_struct *p); 1905 1906void yield(void); 1907 1908/* 1909 * The default (Linux) execution domain. 1910 */ 1911extern struct exec_domain default_exec_domain; 1912 1913union thread_union { 1914 struct thread_info thread_info; 1915 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1916}; 1917 1918#ifndef __HAVE_ARCH_KSTACK_END 1919static inline int kstack_end(void *addr) 1920{ 1921 /* Reliable end of stack detection: 1922 * Some APM bios versions misalign the stack 1923 */ 1924 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1925} 1926#endif 1927 1928extern union thread_union init_thread_union; 1929extern struct task_struct init_task; 1930 1931extern struct mm_struct init_mm; 1932 1933extern struct pid_namespace init_pid_ns; 1934 1935/* 1936 * find a task by one of its numerical ids 1937 * 1938 * find_task_by_pid_ns(): 1939 * finds a task by its pid in the specified namespace 1940 * find_task_by_vpid(): 1941 * finds a task by its virtual pid 1942 * 1943 * see also find_vpid() etc in include/linux/pid.h 1944 */ 1945 1946extern struct task_struct *find_task_by_vpid(pid_t nr); 1947extern struct task_struct *find_task_by_pid_ns(pid_t nr, 1948 struct pid_namespace *ns); 1949 1950/* per-UID process charging. */ 1951extern struct user_struct * alloc_uid(kuid_t); 1952static inline struct user_struct *get_uid(struct user_struct *u) 1953{ 1954 atomic_inc(&u->__count); 1955 return u; 1956} 1957extern void free_uid(struct user_struct *); 1958 1959#include <asm/current.h> 1960 1961extern void xtime_update(unsigned long ticks); 1962 1963extern int wake_up_state(struct task_struct *tsk, unsigned int state); 1964extern int wake_up_process(struct task_struct *tsk); 1965extern void wake_up_new_task(struct task_struct *tsk); 1966#ifdef CONFIG_SMP 1967 extern void kick_process(struct task_struct *tsk); 1968#else 1969 static inline void kick_process(struct task_struct *tsk) { } 1970#endif 1971extern void sched_fork(struct task_struct *p); 1972extern void sched_dead(struct task_struct *p); 1973 1974extern void proc_caches_init(void); 1975extern void flush_signals(struct task_struct *); 1976extern void __flush_signals(struct task_struct *); 1977extern void ignore_signals(struct task_struct *); 1978extern void flush_signal_handlers(struct task_struct *, int force_default); 1979extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 1980 1981static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 1982{ 1983 unsigned long flags; 1984 int ret; 1985 1986 spin_lock_irqsave(&tsk->sighand->siglock, flags); 1987 ret = dequeue_signal(tsk, mask, info); 1988 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 1989 1990 return ret; 1991} 1992 1993extern void block_all_signals(int (*notifier)(void *priv), void *priv, 1994 sigset_t *mask); 1995extern void unblock_all_signals(void); 1996extern void release_task(struct task_struct * p); 1997extern int send_sig_info(int, struct siginfo *, struct task_struct *); 1998extern int force_sigsegv(int, struct task_struct *); 1999extern int force_sig_info(int, struct siginfo *, struct task_struct *); 2000extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 2001extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 2002extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *, 2003 const struct cred *, u32); 2004extern int kill_pgrp(struct pid *pid, int sig, int priv); 2005extern int kill_pid(struct pid *pid, int sig, int priv); 2006extern int kill_proc_info(int, struct siginfo *, pid_t); 2007extern __must_check bool do_notify_parent(struct task_struct *, int); 2008extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); 2009extern void force_sig(int, struct task_struct *); 2010extern int send_sig(int, struct task_struct *, int); 2011extern int zap_other_threads(struct task_struct *p); 2012extern struct sigqueue *sigqueue_alloc(void); 2013extern void sigqueue_free(struct sigqueue *); 2014extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); 2015extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 2016 2017static inline void restore_saved_sigmask(void) 2018{ 2019 if (test_and_clear_restore_sigmask()) 2020 __set_current_blocked(¤t->saved_sigmask); 2021} 2022 2023static inline sigset_t *sigmask_to_save(void) 2024{ 2025 sigset_t *res = ¤t->blocked; 2026 if (unlikely(test_restore_sigmask())) 2027 res = ¤t->saved_sigmask; 2028 return res; 2029} 2030 2031static inline int kill_cad_pid(int sig, int priv) 2032{ 2033 return kill_pid(cad_pid, sig, priv); 2034} 2035 2036/* These can be the second arg to send_sig_info/send_group_sig_info. */ 2037#define SEND_SIG_NOINFO ((struct siginfo *) 0) 2038#define SEND_SIG_PRIV ((struct siginfo *) 1) 2039#define SEND_SIG_FORCED ((struct siginfo *) 2) 2040 2041/* 2042 * True if we are on the alternate signal stack. 2043 */ 2044static inline int on_sig_stack(unsigned long sp) 2045{ 2046#ifdef CONFIG_STACK_GROWSUP 2047 return sp >= current->sas_ss_sp && 2048 sp - current->sas_ss_sp < current->sas_ss_size; 2049#else 2050 return sp > current->sas_ss_sp && 2051 sp - current->sas_ss_sp <= current->sas_ss_size; 2052#endif 2053} 2054 2055static inline int sas_ss_flags(unsigned long sp) 2056{ 2057 return (current->sas_ss_size == 0 ? SS_DISABLE 2058 : on_sig_stack(sp) ? SS_ONSTACK : 0); 2059} 2060 2061static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig) 2062{ 2063 if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp)) 2064#ifdef CONFIG_STACK_GROWSUP 2065 return current->sas_ss_sp; 2066#else 2067 return current->sas_ss_sp + current->sas_ss_size; 2068#endif 2069 return sp; 2070} 2071 2072/* 2073 * Routines for handling mm_structs 2074 */ 2075extern struct mm_struct * mm_alloc(void); 2076 2077/* mmdrop drops the mm and the page tables */ 2078extern void __mmdrop(struct mm_struct *); 2079static inline void mmdrop(struct mm_struct * mm) 2080{ 2081 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 2082 __mmdrop(mm); 2083} 2084 2085/* mmput gets rid of the mappings and all user-space */ 2086extern void mmput(struct mm_struct *); 2087/* Grab a reference to a task's mm, if it is not already going away */ 2088extern struct mm_struct *get_task_mm(struct task_struct *task); 2089/* 2090 * Grab a reference to a task's mm, if it is not already going away 2091 * and ptrace_may_access with the mode parameter passed to it 2092 * succeeds. 2093 */ 2094extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode); 2095/* Remove the current tasks stale references to the old mm_struct */ 2096extern void mm_release(struct task_struct *, struct mm_struct *); 2097/* Allocate a new mm structure and copy contents from tsk->mm */ 2098extern struct mm_struct *dup_mm(struct task_struct *tsk); 2099 2100extern int copy_thread(unsigned long, unsigned long, unsigned long, 2101 struct task_struct *); 2102extern void flush_thread(void); 2103extern void exit_thread(void); 2104 2105extern void exit_files(struct task_struct *); 2106extern void __cleanup_sighand(struct sighand_struct *); 2107 2108extern void exit_itimers(struct signal_struct *); 2109extern void flush_itimer_signals(void); 2110 2111extern void do_group_exit(int); 2112 2113extern int allow_signal(int); 2114extern int disallow_signal(int); 2115 2116extern int do_execve(const char *, 2117 const char __user * const __user *, 2118 const char __user * const __user *); 2119extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *); 2120struct task_struct *fork_idle(int); 2121extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 2122 2123extern void set_task_comm(struct task_struct *tsk, char *from); 2124extern char *get_task_comm(char *to, struct task_struct *tsk); 2125 2126#ifdef CONFIG_SMP 2127void scheduler_ipi(void); 2128extern unsigned long wait_task_inactive(struct task_struct *, long match_state); 2129#else 2130static inline void scheduler_ipi(void) { } 2131static inline unsigned long wait_task_inactive(struct task_struct *p, 2132 long match_state) 2133{ 2134 return 1; 2135} 2136#endif 2137 2138#define next_task(p) \ 2139 list_entry_rcu((p)->tasks.next, struct task_struct, tasks) 2140 2141#define for_each_process(p) \ 2142 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 2143 2144extern bool current_is_single_threaded(void); 2145 2146/* 2147 * Careful: do_each_thread/while_each_thread is a double loop so 2148 * 'break' will not work as expected - use goto instead. 2149 */ 2150#define do_each_thread(g, t) \ 2151 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 2152 2153#define while_each_thread(g, t) \ 2154 while ((t = next_thread(t)) != g) 2155 2156static inline int get_nr_threads(struct task_struct *tsk) 2157{ 2158 return tsk->signal->nr_threads; 2159} 2160 2161static inline bool thread_group_leader(struct task_struct *p) 2162{ 2163 return p->exit_signal >= 0; 2164} 2165 2166/* Do to the insanities of de_thread it is possible for a process 2167 * to have the pid of the thread group leader without actually being 2168 * the thread group leader. For iteration through the pids in proc 2169 * all we care about is that we have a task with the appropriate 2170 * pid, we don't actually care if we have the right task. 2171 */ 2172static inline int has_group_leader_pid(struct task_struct *p) 2173{ 2174 return p->pid == p->tgid; 2175} 2176 2177static inline 2178int same_thread_group(struct task_struct *p1, struct task_struct *p2) 2179{ 2180 return p1->tgid == p2->tgid; 2181} 2182 2183static inline struct task_struct *next_thread(const struct task_struct *p) 2184{ 2185 return list_entry_rcu(p->thread_group.next, 2186 struct task_struct, thread_group); 2187} 2188 2189static inline int thread_group_empty(struct task_struct *p) 2190{ 2191 return list_empty(&p->thread_group); 2192} 2193 2194#define delay_group_leader(p) \ 2195 (thread_group_leader(p) && !thread_group_empty(p)) 2196 2197/* 2198 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 2199 * subscriptions and synchronises with wait4(). Also used in procfs. Also 2200 * pins the final release of task.io_context. Also protects ->cpuset and 2201 * ->cgroup.subsys[]. And ->vfork_done. 2202 * 2203 * Nests both inside and outside of read_lock(&tasklist_lock). 2204 * It must not be nested with write_lock_irq(&tasklist_lock), 2205 * neither inside nor outside. 2206 */ 2207static inline void task_lock(struct task_struct *p) 2208{ 2209 spin_lock(&p->alloc_lock); 2210} 2211 2212static inline void task_unlock(struct task_struct *p) 2213{ 2214 spin_unlock(&p->alloc_lock); 2215} 2216 2217extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, 2218 unsigned long *flags); 2219 2220static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 2221 unsigned long *flags) 2222{ 2223 struct sighand_struct *ret; 2224 2225 ret = __lock_task_sighand(tsk, flags); 2226 (void)__cond_lock(&tsk->sighand->siglock, ret); 2227 return ret; 2228} 2229 2230static inline void unlock_task_sighand(struct task_struct *tsk, 2231 unsigned long *flags) 2232{ 2233 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 2234} 2235 2236#ifdef CONFIG_CGROUPS 2237static inline void threadgroup_change_begin(struct task_struct *tsk) 2238{ 2239 down_read(&tsk->signal->group_rwsem); 2240} 2241static inline void threadgroup_change_end(struct task_struct *tsk) 2242{ 2243 up_read(&tsk->signal->group_rwsem); 2244} 2245 2246/** 2247 * threadgroup_lock - lock threadgroup 2248 * @tsk: member task of the threadgroup to lock 2249 * 2250 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter 2251 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or 2252 * change ->group_leader/pid. This is useful for cases where the threadgroup 2253 * needs to stay stable across blockable operations. 2254 * 2255 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for 2256 * synchronization. While held, no new task will be added to threadgroup 2257 * and no existing live task will have its PF_EXITING set. 2258 * 2259 * de_thread() does threadgroup_change_{begin|end}() when a non-leader 2260 * sub-thread becomes a new leader. 2261 */ 2262static inline void threadgroup_lock(struct task_struct *tsk) 2263{ 2264 down_write(&tsk->signal->group_rwsem); 2265} 2266 2267/** 2268 * threadgroup_unlock - unlock threadgroup 2269 * @tsk: member task of the threadgroup to unlock 2270 * 2271 * Reverse threadgroup_lock(). 2272 */ 2273static inline void threadgroup_unlock(struct task_struct *tsk) 2274{ 2275 up_write(&tsk->signal->group_rwsem); 2276} 2277#else 2278static inline void threadgroup_change_begin(struct task_struct *tsk) {} 2279static inline void threadgroup_change_end(struct task_struct *tsk) {} 2280static inline void threadgroup_lock(struct task_struct *tsk) {} 2281static inline void threadgroup_unlock(struct task_struct *tsk) {} 2282#endif 2283 2284#ifndef __HAVE_THREAD_FUNCTIONS 2285 2286#define task_thread_info(task) ((struct thread_info *)(task)->stack) 2287#define task_stack_page(task) ((task)->stack) 2288 2289static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 2290{ 2291 *task_thread_info(p) = *task_thread_info(org); 2292 task_thread_info(p)->task = p; 2293} 2294 2295static inline unsigned long *end_of_stack(struct task_struct *p) 2296{ 2297 return (unsigned long *)(task_thread_info(p) + 1); 2298} 2299 2300#endif 2301 2302static inline int object_is_on_stack(void *obj) 2303{ 2304 void *stack = task_stack_page(current); 2305 2306 return (obj >= stack) && (obj < (stack + THREAD_SIZE)); 2307} 2308 2309extern void thread_info_cache_init(void); 2310 2311#ifdef CONFIG_DEBUG_STACK_USAGE 2312static inline unsigned long stack_not_used(struct task_struct *p) 2313{ 2314 unsigned long *n = end_of_stack(p); 2315 2316 do { /* Skip over canary */ 2317 n++; 2318 } while (!*n); 2319 2320 return (unsigned long)n - (unsigned long)end_of_stack(p); 2321} 2322#endif 2323 2324/* set thread flags in other task's structures 2325 * - see asm/thread_info.h for TIF_xxxx flags available 2326 */ 2327static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 2328{ 2329 set_ti_thread_flag(task_thread_info(tsk), flag); 2330} 2331 2332static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2333{ 2334 clear_ti_thread_flag(task_thread_info(tsk), flag); 2335} 2336 2337static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 2338{ 2339 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 2340} 2341 2342static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2343{ 2344 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 2345} 2346 2347static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 2348{ 2349 return test_ti_thread_flag(task_thread_info(tsk), flag); 2350} 2351 2352static inline void set_tsk_need_resched(struct task_struct *tsk) 2353{ 2354 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2355} 2356 2357static inline void clear_tsk_need_resched(struct task_struct *tsk) 2358{ 2359 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2360} 2361 2362static inline int test_tsk_need_resched(struct task_struct *tsk) 2363{ 2364 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); 2365} 2366 2367static inline int restart_syscall(void) 2368{ 2369 set_tsk_thread_flag(current, TIF_SIGPENDING); 2370 return -ERESTARTNOINTR; 2371} 2372 2373static inline int signal_pending(struct task_struct *p) 2374{ 2375 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 2376} 2377 2378static inline int __fatal_signal_pending(struct task_struct *p) 2379{ 2380 return unlikely(sigismember(&p->pending.signal, SIGKILL)); 2381} 2382 2383static inline int fatal_signal_pending(struct task_struct *p) 2384{ 2385 return signal_pending(p) && __fatal_signal_pending(p); 2386} 2387 2388static inline int signal_pending_state(long state, struct task_struct *p) 2389{ 2390 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) 2391 return 0; 2392 if (!signal_pending(p)) 2393 return 0; 2394 2395 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); 2396} 2397 2398static inline int need_resched(void) 2399{ 2400 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 2401} 2402 2403/* 2404 * cond_resched() and cond_resched_lock(): latency reduction via 2405 * explicit rescheduling in places that are safe. The return 2406 * value indicates whether a reschedule was done in fact. 2407 * cond_resched_lock() will drop the spinlock before scheduling, 2408 * cond_resched_softirq() will enable bhs before scheduling. 2409 */ 2410extern int _cond_resched(void); 2411 2412#define cond_resched() ({ \ 2413 __might_sleep(__FILE__, __LINE__, 0); \ 2414 _cond_resched(); \ 2415}) 2416 2417extern int __cond_resched_lock(spinlock_t *lock); 2418 2419#ifdef CONFIG_PREEMPT_COUNT 2420#define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET 2421#else 2422#define PREEMPT_LOCK_OFFSET 0 2423#endif 2424 2425#define cond_resched_lock(lock) ({ \ 2426 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ 2427 __cond_resched_lock(lock); \ 2428}) 2429 2430extern int __cond_resched_softirq(void); 2431 2432#define cond_resched_softirq() ({ \ 2433 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ 2434 __cond_resched_softirq(); \ 2435}) 2436 2437static inline void cond_resched_rcu(void) 2438{ 2439#if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) 2440 rcu_read_unlock(); 2441 cond_resched(); 2442 rcu_read_lock(); 2443#endif 2444} 2445 2446/* 2447 * Does a critical section need to be broken due to another 2448 * task waiting?: (technically does not depend on CONFIG_PREEMPT, 2449 * but a general need for low latency) 2450 */ 2451static inline int spin_needbreak(spinlock_t *lock) 2452{ 2453#ifdef CONFIG_PREEMPT 2454 return spin_is_contended(lock); 2455#else 2456 return 0; 2457#endif 2458} 2459 2460/* 2461 * Idle thread specific functions to determine the need_resched 2462 * polling state. We have two versions, one based on TS_POLLING in 2463 * thread_info.status and one based on TIF_POLLING_NRFLAG in 2464 * thread_info.flags 2465 */ 2466#ifdef TS_POLLING 2467static inline int tsk_is_polling(struct task_struct *p) 2468{ 2469 return task_thread_info(p)->status & TS_POLLING; 2470} 2471static inline void current_set_polling(void) 2472{ 2473 current_thread_info()->status |= TS_POLLING; 2474} 2475 2476static inline void current_clr_polling(void) 2477{ 2478 current_thread_info()->status &= ~TS_POLLING; 2479 smp_mb__after_clear_bit(); 2480} 2481#elif defined(TIF_POLLING_NRFLAG) 2482static inline int tsk_is_polling(struct task_struct *p) 2483{ 2484 return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG); 2485} 2486static inline void current_set_polling(void) 2487{ 2488 set_thread_flag(TIF_POLLING_NRFLAG); 2489} 2490 2491static inline void current_clr_polling(void) 2492{ 2493 clear_thread_flag(TIF_POLLING_NRFLAG); 2494} 2495#else 2496static inline int tsk_is_polling(struct task_struct *p) { return 0; } 2497static inline void current_set_polling(void) { } 2498static inline void current_clr_polling(void) { } 2499#endif 2500 2501/* 2502 * Thread group CPU time accounting. 2503 */ 2504void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); 2505void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); 2506 2507static inline void thread_group_cputime_init(struct signal_struct *sig) 2508{ 2509 raw_spin_lock_init(&sig->cputimer.lock); 2510} 2511 2512/* 2513 * Reevaluate whether the task has signals pending delivery. 2514 * Wake the task if so. 2515 * This is required every time the blocked sigset_t changes. 2516 * callers must hold sighand->siglock. 2517 */ 2518extern void recalc_sigpending_and_wake(struct task_struct *t); 2519extern void recalc_sigpending(void); 2520 2521extern void signal_wake_up_state(struct task_struct *t, unsigned int state); 2522 2523static inline void signal_wake_up(struct task_struct *t, bool resume) 2524{ 2525 signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0); 2526} 2527static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume) 2528{ 2529 signal_wake_up_state(t, resume ? __TASK_TRACED : 0); 2530} 2531 2532/* 2533 * Wrappers for p->thread_info->cpu access. No-op on UP. 2534 */ 2535#ifdef CONFIG_SMP 2536 2537static inline unsigned int task_cpu(const struct task_struct *p) 2538{ 2539 return task_thread_info(p)->cpu; 2540} 2541 2542extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 2543 2544#else 2545 2546static inline unsigned int task_cpu(const struct task_struct *p) 2547{ 2548 return 0; 2549} 2550 2551static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 2552{ 2553} 2554 2555#endif /* CONFIG_SMP */ 2556 2557extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); 2558extern long sched_getaffinity(pid_t pid, struct cpumask *mask); 2559 2560#ifdef CONFIG_CGROUP_SCHED 2561extern struct task_group root_task_group; 2562#endif /* CONFIG_CGROUP_SCHED */ 2563 2564extern int task_can_switch_user(struct user_struct *up, 2565 struct task_struct *tsk); 2566 2567#ifdef CONFIG_TASK_XACCT 2568static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2569{ 2570 tsk->ioac.rchar += amt; 2571} 2572 2573static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2574{ 2575 tsk->ioac.wchar += amt; 2576} 2577 2578static inline void inc_syscr(struct task_struct *tsk) 2579{ 2580 tsk->ioac.syscr++; 2581} 2582 2583static inline void inc_syscw(struct task_struct *tsk) 2584{ 2585 tsk->ioac.syscw++; 2586} 2587#else 2588static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2589{ 2590} 2591 2592static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2593{ 2594} 2595 2596static inline void inc_syscr(struct task_struct *tsk) 2597{ 2598} 2599 2600static inline void inc_syscw(struct task_struct *tsk) 2601{ 2602} 2603#endif 2604 2605#ifndef TASK_SIZE_OF 2606#define TASK_SIZE_OF(tsk) TASK_SIZE 2607#endif 2608 2609#ifdef CONFIG_MM_OWNER 2610extern void mm_update_next_owner(struct mm_struct *mm); 2611extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); 2612#else 2613static inline void mm_update_next_owner(struct mm_struct *mm) 2614{ 2615} 2616 2617static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) 2618{ 2619} 2620#endif /* CONFIG_MM_OWNER */ 2621 2622static inline unsigned long task_rlimit(const struct task_struct *tsk, 2623 unsigned int limit) 2624{ 2625 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); 2626} 2627 2628static inline unsigned long task_rlimit_max(const struct task_struct *tsk, 2629 unsigned int limit) 2630{ 2631 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); 2632} 2633 2634static inline unsigned long rlimit(unsigned int limit) 2635{ 2636 return task_rlimit(current, limit); 2637} 2638 2639static inline unsigned long rlimit_max(unsigned int limit) 2640{ 2641 return task_rlimit_max(current, limit); 2642} 2643 2644#endif 2645