sched.h revision f0af911a9dec9de702645182c8d269449e24d24b
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/* 0x02000000 was previously the unused CLONE_STOPPED (Start in stopped state) 25 and is now available for re-use. */ 26#define CLONE_NEWUTS 0x04000000 /* New utsname group? */ 27#define CLONE_NEWIPC 0x08000000 /* New ipcs */ 28#define CLONE_NEWUSER 0x10000000 /* New user namespace */ 29#define CLONE_NEWPID 0x20000000 /* New pid namespace */ 30#define CLONE_NEWNET 0x40000000 /* New network namespace */ 31#define CLONE_IO 0x80000000 /* Clone io context */ 32 33/* 34 * Scheduling policies 35 */ 36#define SCHED_NORMAL 0 37#define SCHED_FIFO 1 38#define SCHED_RR 2 39#define SCHED_BATCH 3 40/* SCHED_ISO: reserved but not implemented yet */ 41#define SCHED_IDLE 5 42/* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */ 43#define SCHED_RESET_ON_FORK 0x40000000 44 45#ifdef __KERNEL__ 46 47struct sched_param { 48 int sched_priority; 49}; 50 51#include <asm/param.h> /* for HZ */ 52 53#include <linux/capability.h> 54#include <linux/threads.h> 55#include <linux/kernel.h> 56#include <linux/types.h> 57#include <linux/timex.h> 58#include <linux/jiffies.h> 59#include <linux/rbtree.h> 60#include <linux/thread_info.h> 61#include <linux/cpumask.h> 62#include <linux/errno.h> 63#include <linux/nodemask.h> 64#include <linux/mm_types.h> 65 66#include <asm/system.h> 67#include <asm/page.h> 68#include <asm/ptrace.h> 69#include <asm/cputime.h> 70 71#include <linux/smp.h> 72#include <linux/sem.h> 73#include <linux/signal.h> 74#include <linux/compiler.h> 75#include <linux/completion.h> 76#include <linux/pid.h> 77#include <linux/percpu.h> 78#include <linux/topology.h> 79#include <linux/proportions.h> 80#include <linux/seccomp.h> 81#include <linux/rcupdate.h> 82#include <linux/rculist.h> 83#include <linux/rtmutex.h> 84 85#include <linux/time.h> 86#include <linux/param.h> 87#include <linux/resource.h> 88#include <linux/timer.h> 89#include <linux/hrtimer.h> 90#include <linux/task_io_accounting.h> 91#include <linux/latencytop.h> 92#include <linux/cred.h> 93 94#include <asm/processor.h> 95 96struct exec_domain; 97struct futex_pi_state; 98struct robust_list_head; 99struct bio_list; 100struct fs_struct; 101struct perf_event_context; 102 103/* 104 * List of flags we want to share for kernel threads, 105 * if only because they are not used by them anyway. 106 */ 107#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 108 109/* 110 * These are the constant used to fake the fixed-point load-average 111 * counting. Some notes: 112 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 113 * a load-average precision of 10 bits integer + 11 bits fractional 114 * - if you want to count load-averages more often, you need more 115 * precision, or rounding will get you. With 2-second counting freq, 116 * the EXP_n values would be 1981, 2034 and 2043 if still using only 117 * 11 bit fractions. 118 */ 119extern unsigned long avenrun[]; /* Load averages */ 120extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); 121 122#define FSHIFT 11 /* nr of bits of precision */ 123#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 124#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ 125#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 126#define EXP_5 2014 /* 1/exp(5sec/5min) */ 127#define EXP_15 2037 /* 1/exp(5sec/15min) */ 128 129#define CALC_LOAD(load,exp,n) \ 130 load *= exp; \ 131 load += n*(FIXED_1-exp); \ 132 load >>= FSHIFT; 133 134extern unsigned long total_forks; 135extern int nr_threads; 136DECLARE_PER_CPU(unsigned long, process_counts); 137extern int nr_processes(void); 138extern unsigned long nr_running(void); 139extern unsigned long nr_uninterruptible(void); 140extern unsigned long nr_iowait(void); 141extern unsigned long nr_iowait_cpu(int cpu); 142extern unsigned long this_cpu_load(void); 143 144 145extern void calc_global_load(unsigned long ticks); 146 147extern unsigned long get_parent_ip(unsigned long addr); 148 149struct seq_file; 150struct cfs_rq; 151struct task_group; 152#ifdef CONFIG_SCHED_DEBUG 153extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 154extern void proc_sched_set_task(struct task_struct *p); 155extern void 156print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 157#else 158static inline void 159proc_sched_show_task(struct task_struct *p, struct seq_file *m) 160{ 161} 162static inline void proc_sched_set_task(struct task_struct *p) 163{ 164} 165static inline void 166print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 167{ 168} 169#endif 170 171/* 172 * Task state bitmask. NOTE! These bits are also 173 * encoded in fs/proc/array.c: get_task_state(). 174 * 175 * We have two separate sets of flags: task->state 176 * is about runnability, while task->exit_state are 177 * about the task exiting. Confusing, but this way 178 * modifying one set can't modify the other one by 179 * mistake. 180 */ 181#define TASK_RUNNING 0 182#define TASK_INTERRUPTIBLE 1 183#define TASK_UNINTERRUPTIBLE 2 184#define __TASK_STOPPED 4 185#define __TASK_TRACED 8 186/* in tsk->exit_state */ 187#define EXIT_ZOMBIE 16 188#define EXIT_DEAD 32 189/* in tsk->state again */ 190#define TASK_DEAD 64 191#define TASK_WAKEKILL 128 192#define TASK_WAKING 256 193#define TASK_STATE_MAX 512 194 195#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW" 196 197extern char ___assert_task_state[1 - 2*!!( 198 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; 199 200/* Convenience macros for the sake of set_task_state */ 201#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) 202#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) 203#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) 204 205/* Convenience macros for the sake of wake_up */ 206#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 207#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) 208 209/* get_task_state() */ 210#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ 211 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ 212 __TASK_TRACED) 213 214#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) 215#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) 216#define task_is_dead(task) ((task)->exit_state != 0) 217#define task_is_stopped_or_traced(task) \ 218 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) 219#define task_contributes_to_load(task) \ 220 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ 221 (task->flags & PF_FREEZING) == 0) 222 223#define __set_task_state(tsk, state_value) \ 224 do { (tsk)->state = (state_value); } while (0) 225#define set_task_state(tsk, state_value) \ 226 set_mb((tsk)->state, (state_value)) 227 228/* 229 * set_current_state() includes a barrier so that the write of current->state 230 * is correctly serialised wrt the caller's subsequent test of whether to 231 * actually sleep: 232 * 233 * set_current_state(TASK_UNINTERRUPTIBLE); 234 * if (do_i_need_to_sleep()) 235 * schedule(); 236 * 237 * If the caller does not need such serialisation then use __set_current_state() 238 */ 239#define __set_current_state(state_value) \ 240 do { current->state = (state_value); } while (0) 241#define set_current_state(state_value) \ 242 set_mb(current->state, (state_value)) 243 244/* Task command name length */ 245#define TASK_COMM_LEN 16 246 247#include <linux/spinlock.h> 248 249/* 250 * This serializes "schedule()" and also protects 251 * the run-queue from deletions/modifications (but 252 * _adding_ to the beginning of the run-queue has 253 * a separate lock). 254 */ 255extern rwlock_t tasklist_lock; 256extern spinlock_t mmlist_lock; 257 258struct task_struct; 259 260#ifdef CONFIG_PROVE_RCU 261extern int lockdep_tasklist_lock_is_held(void); 262#endif /* #ifdef CONFIG_PROVE_RCU */ 263 264extern void sched_init(void); 265extern void sched_init_smp(void); 266extern asmlinkage void schedule_tail(struct task_struct *prev); 267extern void init_idle(struct task_struct *idle, int cpu); 268extern void init_idle_bootup_task(struct task_struct *idle); 269 270extern int runqueue_is_locked(int cpu); 271 272extern cpumask_var_t nohz_cpu_mask; 273#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 274extern void select_nohz_load_balancer(int stop_tick); 275extern int get_nohz_timer_target(void); 276#else 277static inline void select_nohz_load_balancer(int stop_tick) { } 278#endif 279 280/* 281 * Only dump TASK_* tasks. (0 for all tasks) 282 */ 283extern void show_state_filter(unsigned long state_filter); 284 285static inline void show_state(void) 286{ 287 show_state_filter(0); 288} 289 290extern void show_regs(struct pt_regs *); 291 292/* 293 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 294 * task), SP is the stack pointer of the first frame that should be shown in the back 295 * trace (or NULL if the entire call-chain of the task should be shown). 296 */ 297extern void show_stack(struct task_struct *task, unsigned long *sp); 298 299void io_schedule(void); 300long io_schedule_timeout(long timeout); 301 302extern void cpu_init (void); 303extern void trap_init(void); 304extern void update_process_times(int user); 305extern void scheduler_tick(void); 306 307extern void sched_show_task(struct task_struct *p); 308 309#ifdef CONFIG_LOCKUP_DETECTOR 310extern void touch_softlockup_watchdog(void); 311extern void touch_softlockup_watchdog_sync(void); 312extern void touch_all_softlockup_watchdogs(void); 313extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, 314 void __user *buffer, 315 size_t *lenp, loff_t *ppos); 316extern unsigned int softlockup_panic; 317extern int softlockup_thresh; 318void lockup_detector_init(void); 319#else 320static inline void touch_softlockup_watchdog(void) 321{ 322} 323static inline void touch_softlockup_watchdog_sync(void) 324{ 325} 326static inline void touch_all_softlockup_watchdogs(void) 327{ 328} 329static inline void lockup_detector_init(void) 330{ 331} 332#endif 333 334#ifdef CONFIG_DETECT_HUNG_TASK 335extern unsigned int sysctl_hung_task_panic; 336extern unsigned long sysctl_hung_task_check_count; 337extern unsigned long sysctl_hung_task_timeout_secs; 338extern unsigned long sysctl_hung_task_warnings; 339extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, 340 void __user *buffer, 341 size_t *lenp, loff_t *ppos); 342#else 343/* Avoid need for ifdefs elsewhere in the code */ 344enum { sysctl_hung_task_timeout_secs = 0 }; 345#endif 346 347/* Attach to any functions which should be ignored in wchan output. */ 348#define __sched __attribute__((__section__(".sched.text"))) 349 350/* Linker adds these: start and end of __sched functions */ 351extern char __sched_text_start[], __sched_text_end[]; 352 353/* Is this address in the __sched functions? */ 354extern int in_sched_functions(unsigned long addr); 355 356#define MAX_SCHEDULE_TIMEOUT LONG_MAX 357extern signed long schedule_timeout(signed long timeout); 358extern signed long schedule_timeout_interruptible(signed long timeout); 359extern signed long schedule_timeout_killable(signed long timeout); 360extern signed long schedule_timeout_uninterruptible(signed long timeout); 361asmlinkage void schedule(void); 362extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner); 363 364struct nsproxy; 365struct user_namespace; 366 367/* 368 * Default maximum number of active map areas, this limits the number of vmas 369 * per mm struct. Users can overwrite this number by sysctl but there is a 370 * problem. 371 * 372 * When a program's coredump is generated as ELF format, a section is created 373 * per a vma. In ELF, the number of sections is represented in unsigned short. 374 * This means the number of sections should be smaller than 65535 at coredump. 375 * Because the kernel adds some informative sections to a image of program at 376 * generating coredump, we need some margin. The number of extra sections is 377 * 1-3 now and depends on arch. We use "5" as safe margin, here. 378 */ 379#define MAPCOUNT_ELF_CORE_MARGIN (5) 380#define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) 381 382extern int sysctl_max_map_count; 383 384#include <linux/aio.h> 385 386#ifdef CONFIG_MMU 387extern void arch_pick_mmap_layout(struct mm_struct *mm); 388extern unsigned long 389arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 390 unsigned long, unsigned long); 391extern unsigned long 392arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 393 unsigned long len, unsigned long pgoff, 394 unsigned long flags); 395extern void arch_unmap_area(struct mm_struct *, unsigned long); 396extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 397#else 398static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} 399#endif 400 401 402extern void set_dumpable(struct mm_struct *mm, int value); 403extern int get_dumpable(struct mm_struct *mm); 404 405/* mm flags */ 406/* dumpable bits */ 407#define MMF_DUMPABLE 0 /* core dump is permitted */ 408#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 409 410#define MMF_DUMPABLE_BITS 2 411#define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) 412 413/* coredump filter bits */ 414#define MMF_DUMP_ANON_PRIVATE 2 415#define MMF_DUMP_ANON_SHARED 3 416#define MMF_DUMP_MAPPED_PRIVATE 4 417#define MMF_DUMP_MAPPED_SHARED 5 418#define MMF_DUMP_ELF_HEADERS 6 419#define MMF_DUMP_HUGETLB_PRIVATE 7 420#define MMF_DUMP_HUGETLB_SHARED 8 421 422#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 423#define MMF_DUMP_FILTER_BITS 7 424#define MMF_DUMP_FILTER_MASK \ 425 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 426#define MMF_DUMP_FILTER_DEFAULT \ 427 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ 428 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) 429 430#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS 431# define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) 432#else 433# define MMF_DUMP_MASK_DEFAULT_ELF 0 434#endif 435 /* leave room for more dump flags */ 436#define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ 437#define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ 438 439#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) 440 441struct sighand_struct { 442 atomic_t count; 443 struct k_sigaction action[_NSIG]; 444 spinlock_t siglock; 445 wait_queue_head_t signalfd_wqh; 446}; 447 448struct pacct_struct { 449 int ac_flag; 450 long ac_exitcode; 451 unsigned long ac_mem; 452 cputime_t ac_utime, ac_stime; 453 unsigned long ac_minflt, ac_majflt; 454}; 455 456struct cpu_itimer { 457 cputime_t expires; 458 cputime_t incr; 459 u32 error; 460 u32 incr_error; 461}; 462 463/** 464 * struct task_cputime - collected CPU time counts 465 * @utime: time spent in user mode, in &cputime_t units 466 * @stime: time spent in kernel mode, in &cputime_t units 467 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds 468 * 469 * This structure groups together three kinds of CPU time that are 470 * tracked for threads and thread groups. Most things considering 471 * CPU time want to group these counts together and treat all three 472 * of them in parallel. 473 */ 474struct task_cputime { 475 cputime_t utime; 476 cputime_t stime; 477 unsigned long long sum_exec_runtime; 478}; 479/* Alternate field names when used to cache expirations. */ 480#define prof_exp stime 481#define virt_exp utime 482#define sched_exp sum_exec_runtime 483 484#define INIT_CPUTIME \ 485 (struct task_cputime) { \ 486 .utime = cputime_zero, \ 487 .stime = cputime_zero, \ 488 .sum_exec_runtime = 0, \ 489 } 490 491/* 492 * Disable preemption until the scheduler is running. 493 * Reset by start_kernel()->sched_init()->init_idle(). 494 * 495 * We include PREEMPT_ACTIVE to avoid cond_resched() from working 496 * before the scheduler is active -- see should_resched(). 497 */ 498#define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) 499 500/** 501 * struct thread_group_cputimer - thread group interval timer counts 502 * @cputime: thread group interval timers. 503 * @running: non-zero when there are timers running and 504 * @cputime receives updates. 505 * @lock: lock for fields in this struct. 506 * 507 * This structure contains the version of task_cputime, above, that is 508 * used for thread group CPU timer calculations. 509 */ 510struct thread_group_cputimer { 511 struct task_cputime cputime; 512 int running; 513 spinlock_t lock; 514}; 515 516struct autogroup; 517 518/* 519 * NOTE! "signal_struct" does not have it's own 520 * locking, because a shared signal_struct always 521 * implies a shared sighand_struct, so locking 522 * sighand_struct is always a proper superset of 523 * the locking of signal_struct. 524 */ 525struct signal_struct { 526 atomic_t sigcnt; 527 atomic_t live; 528 int nr_threads; 529 530 wait_queue_head_t wait_chldexit; /* for wait4() */ 531 532 /* current thread group signal load-balancing target: */ 533 struct task_struct *curr_target; 534 535 /* shared signal handling: */ 536 struct sigpending shared_pending; 537 538 /* thread group exit support */ 539 int group_exit_code; 540 /* overloaded: 541 * - notify group_exit_task when ->count is equal to notify_count 542 * - everyone except group_exit_task is stopped during signal delivery 543 * of fatal signals, group_exit_task processes the signal. 544 */ 545 int notify_count; 546 struct task_struct *group_exit_task; 547 548 /* thread group stop support, overloads group_exit_code too */ 549 int group_stop_count; 550 unsigned int flags; /* see SIGNAL_* flags below */ 551 552 /* POSIX.1b Interval Timers */ 553 struct list_head posix_timers; 554 555 /* ITIMER_REAL timer for the process */ 556 struct hrtimer real_timer; 557 struct pid *leader_pid; 558 ktime_t it_real_incr; 559 560 /* 561 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use 562 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these 563 * values are defined to 0 and 1 respectively 564 */ 565 struct cpu_itimer it[2]; 566 567 /* 568 * Thread group totals for process CPU timers. 569 * See thread_group_cputimer(), et al, for details. 570 */ 571 struct thread_group_cputimer cputimer; 572 573 /* Earliest-expiration cache. */ 574 struct task_cputime cputime_expires; 575 576 struct list_head cpu_timers[3]; 577 578 struct pid *tty_old_pgrp; 579 580 /* boolean value for session group leader */ 581 int leader; 582 583 struct tty_struct *tty; /* NULL if no tty */ 584 585#ifdef CONFIG_SCHED_AUTOGROUP 586 struct autogroup *autogroup; 587#endif 588 /* 589 * Cumulative resource counters for dead threads in the group, 590 * and for reaped dead child processes forked by this group. 591 * Live threads maintain their own counters and add to these 592 * in __exit_signal, except for the group leader. 593 */ 594 cputime_t utime, stime, cutime, cstime; 595 cputime_t gtime; 596 cputime_t cgtime; 597#ifndef CONFIG_VIRT_CPU_ACCOUNTING 598 cputime_t prev_utime, prev_stime; 599#endif 600 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 601 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 602 unsigned long inblock, oublock, cinblock, coublock; 603 unsigned long maxrss, cmaxrss; 604 struct task_io_accounting ioac; 605 606 /* 607 * Cumulative ns of schedule CPU time fo dead threads in the 608 * group, not including a zombie group leader, (This only differs 609 * from jiffies_to_ns(utime + stime) if sched_clock uses something 610 * other than jiffies.) 611 */ 612 unsigned long long sum_sched_runtime; 613 614 /* 615 * We don't bother to synchronize most readers of this at all, 616 * because there is no reader checking a limit that actually needs 617 * to get both rlim_cur and rlim_max atomically, and either one 618 * alone is a single word that can safely be read normally. 619 * getrlimit/setrlimit use task_lock(current->group_leader) to 620 * protect this instead of the siglock, because they really 621 * have no need to disable irqs. 622 */ 623 struct rlimit rlim[RLIM_NLIMITS]; 624 625#ifdef CONFIG_BSD_PROCESS_ACCT 626 struct pacct_struct pacct; /* per-process accounting information */ 627#endif 628#ifdef CONFIG_TASKSTATS 629 struct taskstats *stats; 630#endif 631#ifdef CONFIG_AUDIT 632 unsigned audit_tty; 633 struct tty_audit_buf *tty_audit_buf; 634#endif 635 636 int oom_adj; /* OOM kill score adjustment (bit shift) */ 637 int oom_score_adj; /* OOM kill score adjustment */ 638 int oom_score_adj_min; /* OOM kill score adjustment minimum value. 639 * Only settable by CAP_SYS_RESOURCE. */ 640 641 struct mutex cred_guard_mutex; /* guard against foreign influences on 642 * credential calculations 643 * (notably. ptrace) */ 644}; 645 646/* Context switch must be unlocked if interrupts are to be enabled */ 647#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 648# define __ARCH_WANT_UNLOCKED_CTXSW 649#endif 650 651/* 652 * Bits in flags field of signal_struct. 653 */ 654#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 655#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 656#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 657#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 658/* 659 * Pending notifications to parent. 660 */ 661#define SIGNAL_CLD_STOPPED 0x00000010 662#define SIGNAL_CLD_CONTINUED 0x00000020 663#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) 664 665#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ 666 667/* If true, all threads except ->group_exit_task have pending SIGKILL */ 668static inline int signal_group_exit(const struct signal_struct *sig) 669{ 670 return (sig->flags & SIGNAL_GROUP_EXIT) || 671 (sig->group_exit_task != NULL); 672} 673 674/* 675 * Some day this will be a full-fledged user tracking system.. 676 */ 677struct user_struct { 678 atomic_t __count; /* reference count */ 679 atomic_t processes; /* How many processes does this user have? */ 680 atomic_t files; /* How many open files does this user have? */ 681 atomic_t sigpending; /* How many pending signals does this user have? */ 682#ifdef CONFIG_INOTIFY_USER 683 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 684 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 685#endif 686#ifdef CONFIG_FANOTIFY 687 atomic_t fanotify_listeners; 688#endif 689#ifdef CONFIG_EPOLL 690 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ 691#endif 692#ifdef CONFIG_POSIX_MQUEUE 693 /* protected by mq_lock */ 694 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 695#endif 696 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 697 698#ifdef CONFIG_KEYS 699 struct key *uid_keyring; /* UID specific keyring */ 700 struct key *session_keyring; /* UID's default session keyring */ 701#endif 702 703 /* Hash table maintenance information */ 704 struct hlist_node uidhash_node; 705 uid_t uid; 706 struct user_namespace *user_ns; 707 708#ifdef CONFIG_PERF_EVENTS 709 atomic_long_t locked_vm; 710#endif 711}; 712 713extern int uids_sysfs_init(void); 714 715extern struct user_struct *find_user(uid_t); 716 717extern struct user_struct root_user; 718#define INIT_USER (&root_user) 719 720 721struct backing_dev_info; 722struct reclaim_state; 723 724#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 725struct sched_info { 726 /* cumulative counters */ 727 unsigned long pcount; /* # of times run on this cpu */ 728 unsigned long long run_delay; /* time spent waiting on a runqueue */ 729 730 /* timestamps */ 731 unsigned long long last_arrival,/* when we last ran on a cpu */ 732 last_queued; /* when we were last queued to run */ 733#ifdef CONFIG_SCHEDSTATS 734 /* BKL stats */ 735 unsigned int bkl_count; 736#endif 737}; 738#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 739 740#ifdef CONFIG_TASK_DELAY_ACCT 741struct task_delay_info { 742 spinlock_t lock; 743 unsigned int flags; /* Private per-task flags */ 744 745 /* For each stat XXX, add following, aligned appropriately 746 * 747 * struct timespec XXX_start, XXX_end; 748 * u64 XXX_delay; 749 * u32 XXX_count; 750 * 751 * Atomicity of updates to XXX_delay, XXX_count protected by 752 * single lock above (split into XXX_lock if contention is an issue). 753 */ 754 755 /* 756 * XXX_count is incremented on every XXX operation, the delay 757 * associated with the operation is added to XXX_delay. 758 * XXX_delay contains the accumulated delay time in nanoseconds. 759 */ 760 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 761 u64 blkio_delay; /* wait for sync block io completion */ 762 u64 swapin_delay; /* wait for swapin block io completion */ 763 u32 blkio_count; /* total count of the number of sync block */ 764 /* io operations performed */ 765 u32 swapin_count; /* total count of the number of swapin block */ 766 /* io operations performed */ 767 768 struct timespec freepages_start, freepages_end; 769 u64 freepages_delay; /* wait for memory reclaim */ 770 u32 freepages_count; /* total count of memory reclaim */ 771}; 772#endif /* CONFIG_TASK_DELAY_ACCT */ 773 774static inline int sched_info_on(void) 775{ 776#ifdef CONFIG_SCHEDSTATS 777 return 1; 778#elif defined(CONFIG_TASK_DELAY_ACCT) 779 extern int delayacct_on; 780 return delayacct_on; 781#else 782 return 0; 783#endif 784} 785 786enum cpu_idle_type { 787 CPU_IDLE, 788 CPU_NOT_IDLE, 789 CPU_NEWLY_IDLE, 790 CPU_MAX_IDLE_TYPES 791}; 792 793/* 794 * sched-domains (multiprocessor balancing) declarations: 795 */ 796 797/* 798 * Increase resolution of nice-level calculations: 799 */ 800#define SCHED_LOAD_SHIFT 10 801#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 802 803#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE 804 805#ifdef CONFIG_SMP 806#define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ 807#define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ 808#define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ 809#define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ 810#define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ 811#define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ 812#define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */ 813#define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ 814#define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */ 815#define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ 816#define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ 817#define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ 818#define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ 819 820enum powersavings_balance_level { 821 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ 822 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package 823 * first for long running threads 824 */ 825 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle 826 * cpu package for power savings 827 */ 828 MAX_POWERSAVINGS_BALANCE_LEVELS 829}; 830 831extern int sched_mc_power_savings, sched_smt_power_savings; 832 833static inline int sd_balance_for_mc_power(void) 834{ 835 if (sched_smt_power_savings) 836 return SD_POWERSAVINGS_BALANCE; 837 838 if (!sched_mc_power_savings) 839 return SD_PREFER_SIBLING; 840 841 return 0; 842} 843 844static inline int sd_balance_for_package_power(void) 845{ 846 if (sched_mc_power_savings | sched_smt_power_savings) 847 return SD_POWERSAVINGS_BALANCE; 848 849 return SD_PREFER_SIBLING; 850} 851 852extern int __weak arch_sd_sibiling_asym_packing(void); 853 854/* 855 * Optimise SD flags for power savings: 856 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings. 857 * Keep default SD flags if sched_{smt,mc}_power_saving=0 858 */ 859 860static inline int sd_power_saving_flags(void) 861{ 862 if (sched_mc_power_savings | sched_smt_power_savings) 863 return SD_BALANCE_NEWIDLE; 864 865 return 0; 866} 867 868struct sched_group { 869 struct sched_group *next; /* Must be a circular list */ 870 871 /* 872 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 873 * single CPU. 874 */ 875 unsigned int cpu_power, cpu_power_orig; 876 unsigned int group_weight; 877 878 /* 879 * The CPUs this group covers. 880 * 881 * NOTE: this field is variable length. (Allocated dynamically 882 * by attaching extra space to the end of the structure, 883 * depending on how many CPUs the kernel has booted up with) 884 * 885 * It is also be embedded into static data structures at build 886 * time. (See 'struct static_sched_group' in kernel/sched.c) 887 */ 888 unsigned long cpumask[0]; 889}; 890 891static inline struct cpumask *sched_group_cpus(struct sched_group *sg) 892{ 893 return to_cpumask(sg->cpumask); 894} 895 896enum sched_domain_level { 897 SD_LV_NONE = 0, 898 SD_LV_SIBLING, 899 SD_LV_MC, 900 SD_LV_BOOK, 901 SD_LV_CPU, 902 SD_LV_NODE, 903 SD_LV_ALLNODES, 904 SD_LV_MAX 905}; 906 907struct sched_domain_attr { 908 int relax_domain_level; 909}; 910 911#define SD_ATTR_INIT (struct sched_domain_attr) { \ 912 .relax_domain_level = -1, \ 913} 914 915struct sched_domain { 916 /* These fields must be setup */ 917 struct sched_domain *parent; /* top domain must be null terminated */ 918 struct sched_domain *child; /* bottom domain must be null terminated */ 919 struct sched_group *groups; /* the balancing groups of the domain */ 920 unsigned long min_interval; /* Minimum balance interval ms */ 921 unsigned long max_interval; /* Maximum balance interval ms */ 922 unsigned int busy_factor; /* less balancing by factor if busy */ 923 unsigned int imbalance_pct; /* No balance until over watermark */ 924 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 925 unsigned int busy_idx; 926 unsigned int idle_idx; 927 unsigned int newidle_idx; 928 unsigned int wake_idx; 929 unsigned int forkexec_idx; 930 unsigned int smt_gain; 931 int flags; /* See SD_* */ 932 enum sched_domain_level level; 933 934 /* Runtime fields. */ 935 unsigned long last_balance; /* init to jiffies. units in jiffies */ 936 unsigned int balance_interval; /* initialise to 1. units in ms. */ 937 unsigned int nr_balance_failed; /* initialise to 0 */ 938 939 u64 last_update; 940 941#ifdef CONFIG_SCHEDSTATS 942 /* load_balance() stats */ 943 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 944 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 945 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 946 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 947 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 948 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 949 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 950 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 951 952 /* Active load balancing */ 953 unsigned int alb_count; 954 unsigned int alb_failed; 955 unsigned int alb_pushed; 956 957 /* SD_BALANCE_EXEC stats */ 958 unsigned int sbe_count; 959 unsigned int sbe_balanced; 960 unsigned int sbe_pushed; 961 962 /* SD_BALANCE_FORK stats */ 963 unsigned int sbf_count; 964 unsigned int sbf_balanced; 965 unsigned int sbf_pushed; 966 967 /* try_to_wake_up() stats */ 968 unsigned int ttwu_wake_remote; 969 unsigned int ttwu_move_affine; 970 unsigned int ttwu_move_balance; 971#endif 972#ifdef CONFIG_SCHED_DEBUG 973 char *name; 974#endif 975 976 unsigned int span_weight; 977 /* 978 * Span of all CPUs in this domain. 979 * 980 * NOTE: this field is variable length. (Allocated dynamically 981 * by attaching extra space to the end of the structure, 982 * depending on how many CPUs the kernel has booted up with) 983 * 984 * It is also be embedded into static data structures at build 985 * time. (See 'struct static_sched_domain' in kernel/sched.c) 986 */ 987 unsigned long span[0]; 988}; 989 990static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 991{ 992 return to_cpumask(sd->span); 993} 994 995extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 996 struct sched_domain_attr *dattr_new); 997 998/* Allocate an array of sched domains, for partition_sched_domains(). */ 999cpumask_var_t *alloc_sched_domains(unsigned int ndoms); 1000void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); 1001 1002/* Test a flag in parent sched domain */ 1003static inline int test_sd_parent(struct sched_domain *sd, int flag) 1004{ 1005 if (sd->parent && (sd->parent->flags & flag)) 1006 return 1; 1007 1008 return 0; 1009} 1010 1011unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); 1012unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); 1013 1014#else /* CONFIG_SMP */ 1015 1016struct sched_domain_attr; 1017 1018static inline void 1019partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 1020 struct sched_domain_attr *dattr_new) 1021{ 1022} 1023#endif /* !CONFIG_SMP */ 1024 1025 1026struct io_context; /* See blkdev.h */ 1027 1028 1029#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 1030extern void prefetch_stack(struct task_struct *t); 1031#else 1032static inline void prefetch_stack(struct task_struct *t) { } 1033#endif 1034 1035struct audit_context; /* See audit.c */ 1036struct mempolicy; 1037struct pipe_inode_info; 1038struct uts_namespace; 1039 1040struct rq; 1041struct sched_domain; 1042 1043/* 1044 * wake flags 1045 */ 1046#define WF_SYNC 0x01 /* waker goes to sleep after wakup */ 1047#define WF_FORK 0x02 /* child wakeup after fork */ 1048 1049#define ENQUEUE_WAKEUP 1 1050#define ENQUEUE_WAKING 2 1051#define ENQUEUE_HEAD 4 1052 1053#define DEQUEUE_SLEEP 1 1054 1055struct sched_class { 1056 const struct sched_class *next; 1057 1058 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); 1059 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); 1060 void (*yield_task) (struct rq *rq); 1061 1062 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); 1063 1064 struct task_struct * (*pick_next_task) (struct rq *rq); 1065 void (*put_prev_task) (struct rq *rq, struct task_struct *p); 1066 1067#ifdef CONFIG_SMP 1068 int (*select_task_rq)(struct rq *rq, struct task_struct *p, 1069 int sd_flag, int flags); 1070 1071 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); 1072 void (*post_schedule) (struct rq *this_rq); 1073 void (*task_waking) (struct rq *this_rq, struct task_struct *task); 1074 void (*task_woken) (struct rq *this_rq, struct task_struct *task); 1075 1076 void (*set_cpus_allowed)(struct task_struct *p, 1077 const struct cpumask *newmask); 1078 1079 void (*rq_online)(struct rq *rq); 1080 void (*rq_offline)(struct rq *rq); 1081#endif 1082 1083 void (*set_curr_task) (struct rq *rq); 1084 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 1085 void (*task_fork) (struct task_struct *p); 1086 1087 void (*switched_from) (struct rq *this_rq, struct task_struct *task, 1088 int running); 1089 void (*switched_to) (struct rq *this_rq, struct task_struct *task, 1090 int running); 1091 void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 1092 int oldprio, int running); 1093 1094 unsigned int (*get_rr_interval) (struct rq *rq, 1095 struct task_struct *task); 1096 1097#ifdef CONFIG_FAIR_GROUP_SCHED 1098 void (*task_move_group) (struct task_struct *p, int on_rq); 1099#endif 1100}; 1101 1102struct load_weight { 1103 unsigned long weight, inv_weight; 1104}; 1105 1106#ifdef CONFIG_SCHEDSTATS 1107struct sched_statistics { 1108 u64 wait_start; 1109 u64 wait_max; 1110 u64 wait_count; 1111 u64 wait_sum; 1112 u64 iowait_count; 1113 u64 iowait_sum; 1114 1115 u64 sleep_start; 1116 u64 sleep_max; 1117 s64 sum_sleep_runtime; 1118 1119 u64 block_start; 1120 u64 block_max; 1121 u64 exec_max; 1122 u64 slice_max; 1123 1124 u64 nr_migrations_cold; 1125 u64 nr_failed_migrations_affine; 1126 u64 nr_failed_migrations_running; 1127 u64 nr_failed_migrations_hot; 1128 u64 nr_forced_migrations; 1129 1130 u64 nr_wakeups; 1131 u64 nr_wakeups_sync; 1132 u64 nr_wakeups_migrate; 1133 u64 nr_wakeups_local; 1134 u64 nr_wakeups_remote; 1135 u64 nr_wakeups_affine; 1136 u64 nr_wakeups_affine_attempts; 1137 u64 nr_wakeups_passive; 1138 u64 nr_wakeups_idle; 1139}; 1140#endif 1141 1142struct sched_entity { 1143 struct load_weight load; /* for load-balancing */ 1144 struct rb_node run_node; 1145 struct list_head group_node; 1146 unsigned int on_rq; 1147 1148 u64 exec_start; 1149 u64 sum_exec_runtime; 1150 u64 vruntime; 1151 u64 prev_sum_exec_runtime; 1152 1153 u64 nr_migrations; 1154 1155#ifdef CONFIG_SCHEDSTATS 1156 struct sched_statistics statistics; 1157#endif 1158 1159#ifdef CONFIG_FAIR_GROUP_SCHED 1160 struct sched_entity *parent; 1161 /* rq on which this entity is (to be) queued: */ 1162 struct cfs_rq *cfs_rq; 1163 /* rq "owned" by this entity/group: */ 1164 struct cfs_rq *my_q; 1165#endif 1166}; 1167 1168struct sched_rt_entity { 1169 struct list_head run_list; 1170 unsigned long timeout; 1171 unsigned int time_slice; 1172 int nr_cpus_allowed; 1173 1174 struct sched_rt_entity *back; 1175#ifdef CONFIG_RT_GROUP_SCHED 1176 struct sched_rt_entity *parent; 1177 /* rq on which this entity is (to be) queued: */ 1178 struct rt_rq *rt_rq; 1179 /* rq "owned" by this entity/group: */ 1180 struct rt_rq *my_q; 1181#endif 1182}; 1183 1184struct rcu_node; 1185 1186enum perf_event_task_context { 1187 perf_invalid_context = -1, 1188 perf_hw_context = 0, 1189 perf_sw_context, 1190 perf_nr_task_contexts, 1191}; 1192 1193struct task_struct { 1194 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 1195 void *stack; 1196 atomic_t usage; 1197 unsigned int flags; /* per process flags, defined below */ 1198 unsigned int ptrace; 1199 1200 int lock_depth; /* BKL lock depth */ 1201 1202#ifdef CONFIG_SMP 1203#ifdef __ARCH_WANT_UNLOCKED_CTXSW 1204 int oncpu; 1205#endif 1206#endif 1207 1208 int prio, static_prio, normal_prio; 1209 unsigned int rt_priority; 1210 const struct sched_class *sched_class; 1211 struct sched_entity se; 1212 struct sched_rt_entity rt; 1213 1214#ifdef CONFIG_PREEMPT_NOTIFIERS 1215 /* list of struct preempt_notifier: */ 1216 struct hlist_head preempt_notifiers; 1217#endif 1218 1219 /* 1220 * fpu_counter contains the number of consecutive context switches 1221 * that the FPU is used. If this is over a threshold, the lazy fpu 1222 * saving becomes unlazy to save the trap. This is an unsigned char 1223 * so that after 256 times the counter wraps and the behavior turns 1224 * lazy again; this to deal with bursty apps that only use FPU for 1225 * a short time 1226 */ 1227 unsigned char fpu_counter; 1228#ifdef CONFIG_BLK_DEV_IO_TRACE 1229 unsigned int btrace_seq; 1230#endif 1231 1232 unsigned int policy; 1233 cpumask_t cpus_allowed; 1234 1235#ifdef CONFIG_PREEMPT_RCU 1236 int rcu_read_lock_nesting; 1237 char rcu_read_unlock_special; 1238 struct list_head rcu_node_entry; 1239#endif /* #ifdef CONFIG_PREEMPT_RCU */ 1240#ifdef CONFIG_TREE_PREEMPT_RCU 1241 struct rcu_node *rcu_blocked_node; 1242#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ 1243#ifdef CONFIG_RCU_BOOST 1244 struct rt_mutex *rcu_boost_mutex; 1245#endif /* #ifdef CONFIG_RCU_BOOST */ 1246 1247#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 1248 struct sched_info sched_info; 1249#endif 1250 1251 struct list_head tasks; 1252#ifdef CONFIG_SMP 1253 struct plist_node pushable_tasks; 1254#endif 1255 1256 struct mm_struct *mm, *active_mm; 1257#if defined(SPLIT_RSS_COUNTING) 1258 struct task_rss_stat rss_stat; 1259#endif 1260/* task state */ 1261 int exit_state; 1262 int exit_code, exit_signal; 1263 int pdeath_signal; /* The signal sent when the parent dies */ 1264 /* ??? */ 1265 unsigned int personality; 1266 unsigned did_exec:1; 1267 unsigned in_execve:1; /* Tell the LSMs that the process is doing an 1268 * execve */ 1269 unsigned in_iowait:1; 1270 1271 1272 /* Revert to default priority/policy when forking */ 1273 unsigned sched_reset_on_fork:1; 1274 1275 pid_t pid; 1276 pid_t tgid; 1277 1278#ifdef CONFIG_CC_STACKPROTECTOR 1279 /* Canary value for the -fstack-protector gcc feature */ 1280 unsigned long stack_canary; 1281#endif 1282 1283 /* 1284 * pointers to (original) parent process, youngest child, younger sibling, 1285 * older sibling, respectively. (p->father can be replaced with 1286 * p->real_parent->pid) 1287 */ 1288 struct task_struct *real_parent; /* real parent process */ 1289 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ 1290 /* 1291 * children/sibling forms the list of my natural children 1292 */ 1293 struct list_head children; /* list of my children */ 1294 struct list_head sibling; /* linkage in my parent's children list */ 1295 struct task_struct *group_leader; /* threadgroup leader */ 1296 1297 /* 1298 * ptraced is the list of tasks this task is using ptrace on. 1299 * This includes both natural children and PTRACE_ATTACH targets. 1300 * p->ptrace_entry is p's link on the p->parent->ptraced list. 1301 */ 1302 struct list_head ptraced; 1303 struct list_head ptrace_entry; 1304 1305 /* PID/PID hash table linkage. */ 1306 struct pid_link pids[PIDTYPE_MAX]; 1307 struct list_head thread_group; 1308 1309 struct completion *vfork_done; /* for vfork() */ 1310 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1311 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1312 1313 cputime_t utime, stime, utimescaled, stimescaled; 1314 cputime_t gtime; 1315#ifndef CONFIG_VIRT_CPU_ACCOUNTING 1316 cputime_t prev_utime, prev_stime; 1317#endif 1318 unsigned long nvcsw, nivcsw; /* context switch counts */ 1319 struct timespec start_time; /* monotonic time */ 1320 struct timespec real_start_time; /* boot based time */ 1321/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1322 unsigned long min_flt, maj_flt; 1323 1324 struct task_cputime cputime_expires; 1325 struct list_head cpu_timers[3]; 1326 1327/* process credentials */ 1328 const struct cred __rcu *real_cred; /* objective and real subjective task 1329 * credentials (COW) */ 1330 const struct cred __rcu *cred; /* effective (overridable) subjective task 1331 * credentials (COW) */ 1332 struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */ 1333 1334 char comm[TASK_COMM_LEN]; /* executable name excluding path 1335 - access with [gs]et_task_comm (which lock 1336 it with task_lock()) 1337 - initialized normally by setup_new_exec */ 1338/* file system info */ 1339 int link_count, total_link_count; 1340#ifdef CONFIG_SYSVIPC 1341/* ipc stuff */ 1342 struct sysv_sem sysvsem; 1343#endif 1344#ifdef CONFIG_DETECT_HUNG_TASK 1345/* hung task detection */ 1346 unsigned long last_switch_count; 1347#endif 1348/* CPU-specific state of this task */ 1349 struct thread_struct thread; 1350/* filesystem information */ 1351 struct fs_struct *fs; 1352/* open file information */ 1353 struct files_struct *files; 1354/* namespaces */ 1355 struct nsproxy *nsproxy; 1356/* signal handlers */ 1357 struct signal_struct *signal; 1358 struct sighand_struct *sighand; 1359 1360 sigset_t blocked, real_blocked; 1361 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ 1362 struct sigpending pending; 1363 1364 unsigned long sas_ss_sp; 1365 size_t sas_ss_size; 1366 int (*notifier)(void *priv); 1367 void *notifier_data; 1368 sigset_t *notifier_mask; 1369 struct audit_context *audit_context; 1370#ifdef CONFIG_AUDITSYSCALL 1371 uid_t loginuid; 1372 unsigned int sessionid; 1373#endif 1374 seccomp_t seccomp; 1375 1376/* Thread group tracking */ 1377 u32 parent_exec_id; 1378 u32 self_exec_id; 1379/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, 1380 * mempolicy */ 1381 spinlock_t alloc_lock; 1382 1383#ifdef CONFIG_GENERIC_HARDIRQS 1384 /* IRQ handler threads */ 1385 struct irqaction *irqaction; 1386#endif 1387 1388 /* Protection of the PI data structures: */ 1389 raw_spinlock_t pi_lock; 1390 1391#ifdef CONFIG_RT_MUTEXES 1392 /* PI waiters blocked on a rt_mutex held by this task */ 1393 struct plist_head pi_waiters; 1394 /* Deadlock detection and priority inheritance handling */ 1395 struct rt_mutex_waiter *pi_blocked_on; 1396#endif 1397 1398#ifdef CONFIG_DEBUG_MUTEXES 1399 /* mutex deadlock detection */ 1400 struct mutex_waiter *blocked_on; 1401#endif 1402#ifdef CONFIG_TRACE_IRQFLAGS 1403 unsigned int irq_events; 1404 unsigned long hardirq_enable_ip; 1405 unsigned long hardirq_disable_ip; 1406 unsigned int hardirq_enable_event; 1407 unsigned int hardirq_disable_event; 1408 int hardirqs_enabled; 1409 int hardirq_context; 1410 unsigned long softirq_disable_ip; 1411 unsigned long softirq_enable_ip; 1412 unsigned int softirq_disable_event; 1413 unsigned int softirq_enable_event; 1414 int softirqs_enabled; 1415 int softirq_context; 1416#endif 1417#ifdef CONFIG_LOCKDEP 1418# define MAX_LOCK_DEPTH 48UL 1419 u64 curr_chain_key; 1420 int lockdep_depth; 1421 unsigned int lockdep_recursion; 1422 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1423 gfp_t lockdep_reclaim_gfp; 1424#endif 1425 1426/* journalling filesystem info */ 1427 void *journal_info; 1428 1429/* stacked block device info */ 1430 struct bio_list *bio_list; 1431 1432/* VM state */ 1433 struct reclaim_state *reclaim_state; 1434 1435 struct backing_dev_info *backing_dev_info; 1436 1437 struct io_context *io_context; 1438 1439 unsigned long ptrace_message; 1440 siginfo_t *last_siginfo; /* For ptrace use. */ 1441 struct task_io_accounting ioac; 1442#if defined(CONFIG_TASK_XACCT) 1443 u64 acct_rss_mem1; /* accumulated rss usage */ 1444 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1445 cputime_t acct_timexpd; /* stime + utime since last update */ 1446#endif 1447#ifdef CONFIG_CPUSETS 1448 nodemask_t mems_allowed; /* Protected by alloc_lock */ 1449 int mems_allowed_change_disable; 1450 int cpuset_mem_spread_rotor; 1451 int cpuset_slab_spread_rotor; 1452#endif 1453#ifdef CONFIG_CGROUPS 1454 /* Control Group info protected by css_set_lock */ 1455 struct css_set __rcu *cgroups; 1456 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1457 struct list_head cg_list; 1458#endif 1459#ifdef CONFIG_FUTEX 1460 struct robust_list_head __user *robust_list; 1461#ifdef CONFIG_COMPAT 1462 struct compat_robust_list_head __user *compat_robust_list; 1463#endif 1464 struct list_head pi_state_list; 1465 struct futex_pi_state *pi_state_cache; 1466#endif 1467#ifdef CONFIG_PERF_EVENTS 1468 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; 1469 struct mutex perf_event_mutex; 1470 struct list_head perf_event_list; 1471#endif 1472#ifdef CONFIG_NUMA 1473 struct mempolicy *mempolicy; /* Protected by alloc_lock */ 1474 short il_next; 1475#endif 1476 atomic_t fs_excl; /* holding fs exclusive resources */ 1477 struct rcu_head rcu; 1478 1479 /* 1480 * cache last used pipe for splice 1481 */ 1482 struct pipe_inode_info *splice_pipe; 1483#ifdef CONFIG_TASK_DELAY_ACCT 1484 struct task_delay_info *delays; 1485#endif 1486#ifdef CONFIG_FAULT_INJECTION 1487 int make_it_fail; 1488#endif 1489 struct prop_local_single dirties; 1490#ifdef CONFIG_LATENCYTOP 1491 int latency_record_count; 1492 struct latency_record latency_record[LT_SAVECOUNT]; 1493#endif 1494 /* 1495 * time slack values; these are used to round up poll() and 1496 * select() etc timeout values. These are in nanoseconds. 1497 */ 1498 unsigned long timer_slack_ns; 1499 unsigned long default_timer_slack_ns; 1500 1501 struct list_head *scm_work_list; 1502#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1503 /* Index of current stored address in ret_stack */ 1504 int curr_ret_stack; 1505 /* Stack of return addresses for return function tracing */ 1506 struct ftrace_ret_stack *ret_stack; 1507 /* time stamp for last schedule */ 1508 unsigned long long ftrace_timestamp; 1509 /* 1510 * Number of functions that haven't been traced 1511 * because of depth overrun. 1512 */ 1513 atomic_t trace_overrun; 1514 /* Pause for the tracing */ 1515 atomic_t tracing_graph_pause; 1516#endif 1517#ifdef CONFIG_TRACING 1518 /* state flags for use by tracers */ 1519 unsigned long trace; 1520 /* bitmask of trace recursion */ 1521 unsigned long trace_recursion; 1522#endif /* CONFIG_TRACING */ 1523#ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */ 1524 struct memcg_batch_info { 1525 int do_batch; /* incremented when batch uncharge started */ 1526 struct mem_cgroup *memcg; /* target memcg of uncharge */ 1527 unsigned long bytes; /* uncharged usage */ 1528 unsigned long memsw_bytes; /* uncharged mem+swap usage */ 1529 } memcg_batch; 1530#endif 1531}; 1532 1533/* Future-safe accessor for struct task_struct's cpus_allowed. */ 1534#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) 1535 1536/* 1537 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1538 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1539 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1540 * values are inverted: lower p->prio value means higher priority. 1541 * 1542 * The MAX_USER_RT_PRIO value allows the actual maximum 1543 * RT priority to be separate from the value exported to 1544 * user-space. This allows kernel threads to set their 1545 * priority to a value higher than any user task. Note: 1546 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1547 */ 1548 1549#define MAX_USER_RT_PRIO 100 1550#define MAX_RT_PRIO MAX_USER_RT_PRIO 1551 1552#define MAX_PRIO (MAX_RT_PRIO + 40) 1553#define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1554 1555static inline int rt_prio(int prio) 1556{ 1557 if (unlikely(prio < MAX_RT_PRIO)) 1558 return 1; 1559 return 0; 1560} 1561 1562static inline int rt_task(struct task_struct *p) 1563{ 1564 return rt_prio(p->prio); 1565} 1566 1567static inline struct pid *task_pid(struct task_struct *task) 1568{ 1569 return task->pids[PIDTYPE_PID].pid; 1570} 1571 1572static inline struct pid *task_tgid(struct task_struct *task) 1573{ 1574 return task->group_leader->pids[PIDTYPE_PID].pid; 1575} 1576 1577/* 1578 * Without tasklist or rcu lock it is not safe to dereference 1579 * the result of task_pgrp/task_session even if task == current, 1580 * we can race with another thread doing sys_setsid/sys_setpgid. 1581 */ 1582static inline struct pid *task_pgrp(struct task_struct *task) 1583{ 1584 return task->group_leader->pids[PIDTYPE_PGID].pid; 1585} 1586 1587static inline struct pid *task_session(struct task_struct *task) 1588{ 1589 return task->group_leader->pids[PIDTYPE_SID].pid; 1590} 1591 1592struct pid_namespace; 1593 1594/* 1595 * the helpers to get the task's different pids as they are seen 1596 * from various namespaces 1597 * 1598 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1599 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 1600 * current. 1601 * task_xid_nr_ns() : id seen from the ns specified; 1602 * 1603 * set_task_vxid() : assigns a virtual id to a task; 1604 * 1605 * see also pid_nr() etc in include/linux/pid.h 1606 */ 1607pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, 1608 struct pid_namespace *ns); 1609 1610static inline pid_t task_pid_nr(struct task_struct *tsk) 1611{ 1612 return tsk->pid; 1613} 1614 1615static inline pid_t task_pid_nr_ns(struct task_struct *tsk, 1616 struct pid_namespace *ns) 1617{ 1618 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); 1619} 1620 1621static inline pid_t task_pid_vnr(struct task_struct *tsk) 1622{ 1623 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); 1624} 1625 1626 1627static inline pid_t task_tgid_nr(struct task_struct *tsk) 1628{ 1629 return tsk->tgid; 1630} 1631 1632pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1633 1634static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1635{ 1636 return pid_vnr(task_tgid(tsk)); 1637} 1638 1639 1640static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, 1641 struct pid_namespace *ns) 1642{ 1643 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); 1644} 1645 1646static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1647{ 1648 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); 1649} 1650 1651 1652static inline pid_t task_session_nr_ns(struct task_struct *tsk, 1653 struct pid_namespace *ns) 1654{ 1655 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); 1656} 1657 1658static inline pid_t task_session_vnr(struct task_struct *tsk) 1659{ 1660 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); 1661} 1662 1663/* obsolete, do not use */ 1664static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1665{ 1666 return task_pgrp_nr_ns(tsk, &init_pid_ns); 1667} 1668 1669/** 1670 * pid_alive - check that a task structure is not stale 1671 * @p: Task structure to be checked. 1672 * 1673 * Test if a process is not yet dead (at most zombie state) 1674 * If pid_alive fails, then pointers within the task structure 1675 * can be stale and must not be dereferenced. 1676 */ 1677static inline int pid_alive(struct task_struct *p) 1678{ 1679 return p->pids[PIDTYPE_PID].pid != NULL; 1680} 1681 1682/** 1683 * is_global_init - check if a task structure is init 1684 * @tsk: Task structure to be checked. 1685 * 1686 * Check if a task structure is the first user space task the kernel created. 1687 */ 1688static inline int is_global_init(struct task_struct *tsk) 1689{ 1690 return tsk->pid == 1; 1691} 1692 1693/* 1694 * is_container_init: 1695 * check whether in the task is init in its own pid namespace. 1696 */ 1697extern int is_container_init(struct task_struct *tsk); 1698 1699extern struct pid *cad_pid; 1700 1701extern void free_task(struct task_struct *tsk); 1702#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1703 1704extern void __put_task_struct(struct task_struct *t); 1705 1706static inline void put_task_struct(struct task_struct *t) 1707{ 1708 if (atomic_dec_and_test(&t->usage)) 1709 __put_task_struct(t); 1710} 1711 1712extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st); 1713extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st); 1714 1715/* 1716 * Per process flags 1717 */ 1718#define PF_KSOFTIRQD 0x00000001 /* I am ksoftirqd */ 1719#define PF_STARTING 0x00000002 /* being created */ 1720#define PF_EXITING 0x00000004 /* getting shut down */ 1721#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1722#define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1723#define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ 1724#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1725#define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ 1726#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1727#define PF_DUMPCORE 0x00000200 /* dumped core */ 1728#define PF_SIGNALED 0x00000400 /* killed by a signal */ 1729#define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1730#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1731#define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */ 1732#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1733#define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1734#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1735#define PF_KSWAPD 0x00040000 /* I am kswapd */ 1736#define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */ 1737#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1738#define PF_KTHREAD 0x00200000 /* I am a kernel thread */ 1739#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1740#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1741#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1742#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1743#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ 1744#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ 1745#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1746#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1747#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1748#define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ 1749 1750/* 1751 * Only the _current_ task can read/write to tsk->flags, but other 1752 * tasks can access tsk->flags in readonly mode for example 1753 * with tsk_used_math (like during threaded core dumping). 1754 * There is however an exception to this rule during ptrace 1755 * or during fork: the ptracer task is allowed to write to the 1756 * child->flags of its traced child (same goes for fork, the parent 1757 * can write to the child->flags), because we're guaranteed the 1758 * child is not running and in turn not changing child->flags 1759 * at the same time the parent does it. 1760 */ 1761#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1762#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1763#define clear_used_math() clear_stopped_child_used_math(current) 1764#define set_used_math() set_stopped_child_used_math(current) 1765#define conditional_stopped_child_used_math(condition, child) \ 1766 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1767#define conditional_used_math(condition) \ 1768 conditional_stopped_child_used_math(condition, current) 1769#define copy_to_stopped_child_used_math(child) \ 1770 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1771/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1772#define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1773#define used_math() tsk_used_math(current) 1774 1775#ifdef CONFIG_PREEMPT_RCU 1776 1777#define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ 1778#define RCU_READ_UNLOCK_BOOSTED (1 << 1) /* boosted while in RCU read-side. */ 1779#define RCU_READ_UNLOCK_NEED_QS (1 << 2) /* RCU core needs CPU response. */ 1780 1781static inline void rcu_copy_process(struct task_struct *p) 1782{ 1783 p->rcu_read_lock_nesting = 0; 1784 p->rcu_read_unlock_special = 0; 1785#ifdef CONFIG_TREE_PREEMPT_RCU 1786 p->rcu_blocked_node = NULL; 1787#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ 1788#ifdef CONFIG_RCU_BOOST 1789 p->rcu_boost_mutex = NULL; 1790#endif /* #ifdef CONFIG_RCU_BOOST */ 1791 INIT_LIST_HEAD(&p->rcu_node_entry); 1792} 1793 1794#else 1795 1796static inline void rcu_copy_process(struct task_struct *p) 1797{ 1798} 1799 1800#endif 1801 1802#ifdef CONFIG_SMP 1803extern int set_cpus_allowed_ptr(struct task_struct *p, 1804 const struct cpumask *new_mask); 1805#else 1806static inline int set_cpus_allowed_ptr(struct task_struct *p, 1807 const struct cpumask *new_mask) 1808{ 1809 if (!cpumask_test_cpu(0, new_mask)) 1810 return -EINVAL; 1811 return 0; 1812} 1813#endif 1814 1815#ifndef CONFIG_CPUMASK_OFFSTACK 1816static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1817{ 1818 return set_cpus_allowed_ptr(p, &new_mask); 1819} 1820#endif 1821 1822/* 1823 * Do not use outside of architecture code which knows its limitations. 1824 * 1825 * sched_clock() has no promise of monotonicity or bounded drift between 1826 * CPUs, use (which you should not) requires disabling IRQs. 1827 * 1828 * Please use one of the three interfaces below. 1829 */ 1830extern unsigned long long notrace sched_clock(void); 1831/* 1832 * See the comment in kernel/sched_clock.c 1833 */ 1834extern u64 cpu_clock(int cpu); 1835extern u64 local_clock(void); 1836extern u64 sched_clock_cpu(int cpu); 1837 1838 1839extern void sched_clock_init(void); 1840 1841#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1842static inline void sched_clock_tick(void) 1843{ 1844} 1845 1846static inline void sched_clock_idle_sleep_event(void) 1847{ 1848} 1849 1850static inline void sched_clock_idle_wakeup_event(u64 delta_ns) 1851{ 1852} 1853#else 1854/* 1855 * Architectures can set this to 1 if they have specified 1856 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, 1857 * but then during bootup it turns out that sched_clock() 1858 * is reliable after all: 1859 */ 1860extern int sched_clock_stable; 1861 1862extern void sched_clock_tick(void); 1863extern void sched_clock_idle_sleep_event(void); 1864extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1865#endif 1866 1867#ifdef CONFIG_IRQ_TIME_ACCOUNTING 1868/* 1869 * An i/f to runtime opt-in for irq time accounting based off of sched_clock. 1870 * The reason for this explicit opt-in is not to have perf penalty with 1871 * slow sched_clocks. 1872 */ 1873extern void enable_sched_clock_irqtime(void); 1874extern void disable_sched_clock_irqtime(void); 1875#else 1876static inline void enable_sched_clock_irqtime(void) {} 1877static inline void disable_sched_clock_irqtime(void) {} 1878#endif 1879 1880extern unsigned long long 1881task_sched_runtime(struct task_struct *task); 1882extern unsigned long long thread_group_sched_runtime(struct task_struct *task); 1883 1884/* sched_exec is called by processes performing an exec */ 1885#ifdef CONFIG_SMP 1886extern void sched_exec(void); 1887#else 1888#define sched_exec() {} 1889#endif 1890 1891extern void sched_clock_idle_sleep_event(void); 1892extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1893 1894#ifdef CONFIG_HOTPLUG_CPU 1895extern void idle_task_exit(void); 1896#else 1897static inline void idle_task_exit(void) {} 1898#endif 1899 1900#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) 1901extern void wake_up_idle_cpu(int cpu); 1902#else 1903static inline void wake_up_idle_cpu(int cpu) { } 1904#endif 1905 1906extern unsigned int sysctl_sched_latency; 1907extern unsigned int sysctl_sched_min_granularity; 1908extern unsigned int sysctl_sched_wakeup_granularity; 1909extern unsigned int sysctl_sched_child_runs_first; 1910 1911enum sched_tunable_scaling { 1912 SCHED_TUNABLESCALING_NONE, 1913 SCHED_TUNABLESCALING_LOG, 1914 SCHED_TUNABLESCALING_LINEAR, 1915 SCHED_TUNABLESCALING_END, 1916}; 1917extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; 1918 1919#ifdef CONFIG_SCHED_DEBUG 1920extern unsigned int sysctl_sched_migration_cost; 1921extern unsigned int sysctl_sched_nr_migrate; 1922extern unsigned int sysctl_sched_time_avg; 1923extern unsigned int sysctl_timer_migration; 1924extern unsigned int sysctl_sched_shares_window; 1925 1926int sched_proc_update_handler(struct ctl_table *table, int write, 1927 void __user *buffer, size_t *length, 1928 loff_t *ppos); 1929#endif 1930#ifdef CONFIG_SCHED_DEBUG 1931static inline unsigned int get_sysctl_timer_migration(void) 1932{ 1933 return sysctl_timer_migration; 1934} 1935#else 1936static inline unsigned int get_sysctl_timer_migration(void) 1937{ 1938 return 1; 1939} 1940#endif 1941extern unsigned int sysctl_sched_rt_period; 1942extern int sysctl_sched_rt_runtime; 1943 1944int sched_rt_handler(struct ctl_table *table, int write, 1945 void __user *buffer, size_t *lenp, 1946 loff_t *ppos); 1947 1948extern unsigned int sysctl_sched_compat_yield; 1949 1950#ifdef CONFIG_SCHED_AUTOGROUP 1951extern unsigned int sysctl_sched_autogroup_enabled; 1952 1953extern void sched_autogroup_create_attach(struct task_struct *p); 1954extern void sched_autogroup_detach(struct task_struct *p); 1955extern void sched_autogroup_fork(struct signal_struct *sig); 1956extern void sched_autogroup_exit(struct signal_struct *sig); 1957#ifdef CONFIG_PROC_FS 1958extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); 1959extern int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice); 1960#endif 1961#else 1962static inline void sched_autogroup_create_attach(struct task_struct *p) { } 1963static inline void sched_autogroup_detach(struct task_struct *p) { } 1964static inline void sched_autogroup_fork(struct signal_struct *sig) { } 1965static inline void sched_autogroup_exit(struct signal_struct *sig) { } 1966#endif 1967 1968#ifdef CONFIG_RT_MUTEXES 1969extern int rt_mutex_getprio(struct task_struct *p); 1970extern void rt_mutex_setprio(struct task_struct *p, int prio); 1971extern void rt_mutex_adjust_pi(struct task_struct *p); 1972#else 1973static inline int rt_mutex_getprio(struct task_struct *p) 1974{ 1975 return p->normal_prio; 1976} 1977# define rt_mutex_adjust_pi(p) do { } while (0) 1978#endif 1979 1980extern void set_user_nice(struct task_struct *p, long nice); 1981extern int task_prio(const struct task_struct *p); 1982extern int task_nice(const struct task_struct *p); 1983extern int can_nice(const struct task_struct *p, const int nice); 1984extern int task_curr(const struct task_struct *p); 1985extern int idle_cpu(int cpu); 1986extern int sched_setscheduler(struct task_struct *, int, 1987 const struct sched_param *); 1988extern int sched_setscheduler_nocheck(struct task_struct *, int, 1989 const struct sched_param *); 1990extern struct task_struct *idle_task(int cpu); 1991extern struct task_struct *curr_task(int cpu); 1992extern void set_curr_task(int cpu, struct task_struct *p); 1993 1994void yield(void); 1995 1996/* 1997 * The default (Linux) execution domain. 1998 */ 1999extern struct exec_domain default_exec_domain; 2000 2001union thread_union { 2002 struct thread_info thread_info; 2003 unsigned long stack[THREAD_SIZE/sizeof(long)]; 2004}; 2005 2006#ifndef __HAVE_ARCH_KSTACK_END 2007static inline int kstack_end(void *addr) 2008{ 2009 /* Reliable end of stack detection: 2010 * Some APM bios versions misalign the stack 2011 */ 2012 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 2013} 2014#endif 2015 2016extern union thread_union init_thread_union; 2017extern struct task_struct init_task; 2018 2019extern struct mm_struct init_mm; 2020 2021extern struct pid_namespace init_pid_ns; 2022 2023/* 2024 * find a task by one of its numerical ids 2025 * 2026 * find_task_by_pid_ns(): 2027 * finds a task by its pid in the specified namespace 2028 * find_task_by_vpid(): 2029 * finds a task by its virtual pid 2030 * 2031 * see also find_vpid() etc in include/linux/pid.h 2032 */ 2033 2034extern struct task_struct *find_task_by_vpid(pid_t nr); 2035extern struct task_struct *find_task_by_pid_ns(pid_t nr, 2036 struct pid_namespace *ns); 2037 2038extern void __set_special_pids(struct pid *pid); 2039 2040/* per-UID process charging. */ 2041extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 2042static inline struct user_struct *get_uid(struct user_struct *u) 2043{ 2044 atomic_inc(&u->__count); 2045 return u; 2046} 2047extern void free_uid(struct user_struct *); 2048extern void release_uids(struct user_namespace *ns); 2049 2050#include <asm/current.h> 2051 2052extern void do_timer(unsigned long ticks); 2053extern void xtime_update(unsigned long ticks); 2054 2055extern int wake_up_state(struct task_struct *tsk, unsigned int state); 2056extern int wake_up_process(struct task_struct *tsk); 2057extern void wake_up_new_task(struct task_struct *tsk, 2058 unsigned long clone_flags); 2059#ifdef CONFIG_SMP 2060 extern void kick_process(struct task_struct *tsk); 2061#else 2062 static inline void kick_process(struct task_struct *tsk) { } 2063#endif 2064extern void sched_fork(struct task_struct *p, int clone_flags); 2065extern void sched_dead(struct task_struct *p); 2066 2067extern void proc_caches_init(void); 2068extern void flush_signals(struct task_struct *); 2069extern void __flush_signals(struct task_struct *); 2070extern void ignore_signals(struct task_struct *); 2071extern void flush_signal_handlers(struct task_struct *, int force_default); 2072extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 2073 2074static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 2075{ 2076 unsigned long flags; 2077 int ret; 2078 2079 spin_lock_irqsave(&tsk->sighand->siglock, flags); 2080 ret = dequeue_signal(tsk, mask, info); 2081 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 2082 2083 return ret; 2084} 2085 2086extern void block_all_signals(int (*notifier)(void *priv), void *priv, 2087 sigset_t *mask); 2088extern void unblock_all_signals(void); 2089extern void release_task(struct task_struct * p); 2090extern int send_sig_info(int, struct siginfo *, struct task_struct *); 2091extern int force_sigsegv(int, struct task_struct *); 2092extern int force_sig_info(int, struct siginfo *, struct task_struct *); 2093extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 2094extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 2095extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 2096extern int kill_pgrp(struct pid *pid, int sig, int priv); 2097extern int kill_pid(struct pid *pid, int sig, int priv); 2098extern int kill_proc_info(int, struct siginfo *, pid_t); 2099extern int do_notify_parent(struct task_struct *, int); 2100extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); 2101extern void force_sig(int, struct task_struct *); 2102extern int send_sig(int, struct task_struct *, int); 2103extern int zap_other_threads(struct task_struct *p); 2104extern struct sigqueue *sigqueue_alloc(void); 2105extern void sigqueue_free(struct sigqueue *); 2106extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); 2107extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 2108extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 2109 2110static inline int kill_cad_pid(int sig, int priv) 2111{ 2112 return kill_pid(cad_pid, sig, priv); 2113} 2114 2115/* These can be the second arg to send_sig_info/send_group_sig_info. */ 2116#define SEND_SIG_NOINFO ((struct siginfo *) 0) 2117#define SEND_SIG_PRIV ((struct siginfo *) 1) 2118#define SEND_SIG_FORCED ((struct siginfo *) 2) 2119 2120/* 2121 * True if we are on the alternate signal stack. 2122 */ 2123static inline int on_sig_stack(unsigned long sp) 2124{ 2125#ifdef CONFIG_STACK_GROWSUP 2126 return sp >= current->sas_ss_sp && 2127 sp - current->sas_ss_sp < current->sas_ss_size; 2128#else 2129 return sp > current->sas_ss_sp && 2130 sp - current->sas_ss_sp <= current->sas_ss_size; 2131#endif 2132} 2133 2134static inline int sas_ss_flags(unsigned long sp) 2135{ 2136 return (current->sas_ss_size == 0 ? SS_DISABLE 2137 : on_sig_stack(sp) ? SS_ONSTACK : 0); 2138} 2139 2140/* 2141 * Routines for handling mm_structs 2142 */ 2143extern struct mm_struct * mm_alloc(void); 2144 2145/* mmdrop drops the mm and the page tables */ 2146extern void __mmdrop(struct mm_struct *); 2147static inline void mmdrop(struct mm_struct * mm) 2148{ 2149 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 2150 __mmdrop(mm); 2151} 2152 2153/* mmput gets rid of the mappings and all user-space */ 2154extern void mmput(struct mm_struct *); 2155/* Grab a reference to a task's mm, if it is not already going away */ 2156extern struct mm_struct *get_task_mm(struct task_struct *task); 2157/* Remove the current tasks stale references to the old mm_struct */ 2158extern void mm_release(struct task_struct *, struct mm_struct *); 2159/* Allocate a new mm structure and copy contents from tsk->mm */ 2160extern struct mm_struct *dup_mm(struct task_struct *tsk); 2161 2162extern int copy_thread(unsigned long, unsigned long, unsigned long, 2163 struct task_struct *, struct pt_regs *); 2164extern void flush_thread(void); 2165extern void exit_thread(void); 2166 2167extern void exit_files(struct task_struct *); 2168extern void __cleanup_sighand(struct sighand_struct *); 2169 2170extern void exit_itimers(struct signal_struct *); 2171extern void flush_itimer_signals(void); 2172 2173extern NORET_TYPE void do_group_exit(int); 2174 2175extern void daemonize(const char *, ...); 2176extern int allow_signal(int); 2177extern int disallow_signal(int); 2178 2179extern int do_execve(const char *, 2180 const char __user * const __user *, 2181 const char __user * const __user *, struct pt_regs *); 2182extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 2183struct task_struct *fork_idle(int); 2184 2185extern void set_task_comm(struct task_struct *tsk, char *from); 2186extern char *get_task_comm(char *to, struct task_struct *tsk); 2187 2188#ifdef CONFIG_SMP 2189extern unsigned long wait_task_inactive(struct task_struct *, long match_state); 2190#else 2191static inline unsigned long wait_task_inactive(struct task_struct *p, 2192 long match_state) 2193{ 2194 return 1; 2195} 2196#endif 2197 2198#define next_task(p) \ 2199 list_entry_rcu((p)->tasks.next, struct task_struct, tasks) 2200 2201#define for_each_process(p) \ 2202 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 2203 2204extern bool current_is_single_threaded(void); 2205 2206/* 2207 * Careful: do_each_thread/while_each_thread is a double loop so 2208 * 'break' will not work as expected - use goto instead. 2209 */ 2210#define do_each_thread(g, t) \ 2211 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 2212 2213#define while_each_thread(g, t) \ 2214 while ((t = next_thread(t)) != g) 2215 2216static inline int get_nr_threads(struct task_struct *tsk) 2217{ 2218 return tsk->signal->nr_threads; 2219} 2220 2221/* de_thread depends on thread_group_leader not being a pid based check */ 2222#define thread_group_leader(p) (p == p->group_leader) 2223 2224/* Do to the insanities of de_thread it is possible for a process 2225 * to have the pid of the thread group leader without actually being 2226 * the thread group leader. For iteration through the pids in proc 2227 * all we care about is that we have a task with the appropriate 2228 * pid, we don't actually care if we have the right task. 2229 */ 2230static inline int has_group_leader_pid(struct task_struct *p) 2231{ 2232 return p->pid == p->tgid; 2233} 2234 2235static inline 2236int same_thread_group(struct task_struct *p1, struct task_struct *p2) 2237{ 2238 return p1->tgid == p2->tgid; 2239} 2240 2241static inline struct task_struct *next_thread(const struct task_struct *p) 2242{ 2243 return list_entry_rcu(p->thread_group.next, 2244 struct task_struct, thread_group); 2245} 2246 2247static inline int thread_group_empty(struct task_struct *p) 2248{ 2249 return list_empty(&p->thread_group); 2250} 2251 2252#define delay_group_leader(p) \ 2253 (thread_group_leader(p) && !thread_group_empty(p)) 2254 2255static inline int task_detached(struct task_struct *p) 2256{ 2257 return p->exit_signal == -1; 2258} 2259 2260/* 2261 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 2262 * subscriptions and synchronises with wait4(). Also used in procfs. Also 2263 * pins the final release of task.io_context. Also protects ->cpuset and 2264 * ->cgroup.subsys[]. 2265 * 2266 * Nests both inside and outside of read_lock(&tasklist_lock). 2267 * It must not be nested with write_lock_irq(&tasklist_lock), 2268 * neither inside nor outside. 2269 */ 2270static inline void task_lock(struct task_struct *p) 2271{ 2272 spin_lock(&p->alloc_lock); 2273} 2274 2275static inline void task_unlock(struct task_struct *p) 2276{ 2277 spin_unlock(&p->alloc_lock); 2278} 2279 2280extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, 2281 unsigned long *flags); 2282 2283#define lock_task_sighand(tsk, flags) \ 2284({ struct sighand_struct *__ss; \ 2285 __cond_lock(&(tsk)->sighand->siglock, \ 2286 (__ss = __lock_task_sighand(tsk, flags))); \ 2287 __ss; \ 2288}) \ 2289 2290static inline void unlock_task_sighand(struct task_struct *tsk, 2291 unsigned long *flags) 2292{ 2293 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 2294} 2295 2296#ifndef __HAVE_THREAD_FUNCTIONS 2297 2298#define task_thread_info(task) ((struct thread_info *)(task)->stack) 2299#define task_stack_page(task) ((task)->stack) 2300 2301static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 2302{ 2303 *task_thread_info(p) = *task_thread_info(org); 2304 task_thread_info(p)->task = p; 2305} 2306 2307static inline unsigned long *end_of_stack(struct task_struct *p) 2308{ 2309 return (unsigned long *)(task_thread_info(p) + 1); 2310} 2311 2312#endif 2313 2314static inline int object_is_on_stack(void *obj) 2315{ 2316 void *stack = task_stack_page(current); 2317 2318 return (obj >= stack) && (obj < (stack + THREAD_SIZE)); 2319} 2320 2321extern void thread_info_cache_init(void); 2322 2323#ifdef CONFIG_DEBUG_STACK_USAGE 2324static inline unsigned long stack_not_used(struct task_struct *p) 2325{ 2326 unsigned long *n = end_of_stack(p); 2327 2328 do { /* Skip over canary */ 2329 n++; 2330 } while (!*n); 2331 2332 return (unsigned long)n - (unsigned long)end_of_stack(p); 2333} 2334#endif 2335 2336/* set thread flags in other task's structures 2337 * - see asm/thread_info.h for TIF_xxxx flags available 2338 */ 2339static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 2340{ 2341 set_ti_thread_flag(task_thread_info(tsk), flag); 2342} 2343 2344static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2345{ 2346 clear_ti_thread_flag(task_thread_info(tsk), flag); 2347} 2348 2349static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 2350{ 2351 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 2352} 2353 2354static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2355{ 2356 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 2357} 2358 2359static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 2360{ 2361 return test_ti_thread_flag(task_thread_info(tsk), flag); 2362} 2363 2364static inline void set_tsk_need_resched(struct task_struct *tsk) 2365{ 2366 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2367} 2368 2369static inline void clear_tsk_need_resched(struct task_struct *tsk) 2370{ 2371 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2372} 2373 2374static inline int test_tsk_need_resched(struct task_struct *tsk) 2375{ 2376 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); 2377} 2378 2379static inline int restart_syscall(void) 2380{ 2381 set_tsk_thread_flag(current, TIF_SIGPENDING); 2382 return -ERESTARTNOINTR; 2383} 2384 2385static inline int signal_pending(struct task_struct *p) 2386{ 2387 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 2388} 2389 2390static inline int __fatal_signal_pending(struct task_struct *p) 2391{ 2392 return unlikely(sigismember(&p->pending.signal, SIGKILL)); 2393} 2394 2395static inline int fatal_signal_pending(struct task_struct *p) 2396{ 2397 return signal_pending(p) && __fatal_signal_pending(p); 2398} 2399 2400static inline int signal_pending_state(long state, struct task_struct *p) 2401{ 2402 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) 2403 return 0; 2404 if (!signal_pending(p)) 2405 return 0; 2406 2407 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); 2408} 2409 2410static inline int need_resched(void) 2411{ 2412 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 2413} 2414 2415/* 2416 * cond_resched() and cond_resched_lock(): latency reduction via 2417 * explicit rescheduling in places that are safe. The return 2418 * value indicates whether a reschedule was done in fact. 2419 * cond_resched_lock() will drop the spinlock before scheduling, 2420 * cond_resched_softirq() will enable bhs before scheduling. 2421 */ 2422extern int _cond_resched(void); 2423 2424#define cond_resched() ({ \ 2425 __might_sleep(__FILE__, __LINE__, 0); \ 2426 _cond_resched(); \ 2427}) 2428 2429extern int __cond_resched_lock(spinlock_t *lock); 2430 2431#ifdef CONFIG_PREEMPT 2432#define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET 2433#else 2434#define PREEMPT_LOCK_OFFSET 0 2435#endif 2436 2437#define cond_resched_lock(lock) ({ \ 2438 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ 2439 __cond_resched_lock(lock); \ 2440}) 2441 2442extern int __cond_resched_softirq(void); 2443 2444#define cond_resched_softirq() ({ \ 2445 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ 2446 __cond_resched_softirq(); \ 2447}) 2448 2449/* 2450 * Does a critical section need to be broken due to another 2451 * task waiting?: (technically does not depend on CONFIG_PREEMPT, 2452 * but a general need for low latency) 2453 */ 2454static inline int spin_needbreak(spinlock_t *lock) 2455{ 2456#ifdef CONFIG_PREEMPT 2457 return spin_is_contended(lock); 2458#else 2459 return 0; 2460#endif 2461} 2462 2463/* 2464 * Thread group CPU time accounting. 2465 */ 2466void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); 2467void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); 2468 2469static inline void thread_group_cputime_init(struct signal_struct *sig) 2470{ 2471 spin_lock_init(&sig->cputimer.lock); 2472} 2473 2474/* 2475 * Reevaluate whether the task has signals pending delivery. 2476 * Wake the task if so. 2477 * This is required every time the blocked sigset_t changes. 2478 * callers must hold sighand->siglock. 2479 */ 2480extern void recalc_sigpending_and_wake(struct task_struct *t); 2481extern void recalc_sigpending(void); 2482 2483extern void signal_wake_up(struct task_struct *t, int resume_stopped); 2484 2485/* 2486 * Wrappers for p->thread_info->cpu access. No-op on UP. 2487 */ 2488#ifdef CONFIG_SMP 2489 2490static inline unsigned int task_cpu(const struct task_struct *p) 2491{ 2492 return task_thread_info(p)->cpu; 2493} 2494 2495extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 2496 2497#else 2498 2499static inline unsigned int task_cpu(const struct task_struct *p) 2500{ 2501 return 0; 2502} 2503 2504static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 2505{ 2506} 2507 2508#endif /* CONFIG_SMP */ 2509 2510extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); 2511extern long sched_getaffinity(pid_t pid, struct cpumask *mask); 2512 2513extern void normalize_rt_tasks(void); 2514 2515#ifdef CONFIG_CGROUP_SCHED 2516 2517extern struct task_group root_task_group; 2518 2519extern struct task_group *sched_create_group(struct task_group *parent); 2520extern void sched_destroy_group(struct task_group *tg); 2521extern void sched_move_task(struct task_struct *tsk); 2522#ifdef CONFIG_FAIR_GROUP_SCHED 2523extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 2524extern unsigned long sched_group_shares(struct task_group *tg); 2525#endif 2526#ifdef CONFIG_RT_GROUP_SCHED 2527extern int sched_group_set_rt_runtime(struct task_group *tg, 2528 long rt_runtime_us); 2529extern long sched_group_rt_runtime(struct task_group *tg); 2530extern int sched_group_set_rt_period(struct task_group *tg, 2531 long rt_period_us); 2532extern long sched_group_rt_period(struct task_group *tg); 2533extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); 2534#endif 2535#endif 2536 2537extern int task_can_switch_user(struct user_struct *up, 2538 struct task_struct *tsk); 2539 2540#ifdef CONFIG_TASK_XACCT 2541static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2542{ 2543 tsk->ioac.rchar += amt; 2544} 2545 2546static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2547{ 2548 tsk->ioac.wchar += amt; 2549} 2550 2551static inline void inc_syscr(struct task_struct *tsk) 2552{ 2553 tsk->ioac.syscr++; 2554} 2555 2556static inline void inc_syscw(struct task_struct *tsk) 2557{ 2558 tsk->ioac.syscw++; 2559} 2560#else 2561static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2562{ 2563} 2564 2565static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2566{ 2567} 2568 2569static inline void inc_syscr(struct task_struct *tsk) 2570{ 2571} 2572 2573static inline void inc_syscw(struct task_struct *tsk) 2574{ 2575} 2576#endif 2577 2578#ifndef TASK_SIZE_OF 2579#define TASK_SIZE_OF(tsk) TASK_SIZE 2580#endif 2581 2582/* 2583 * Call the function if the target task is executing on a CPU right now: 2584 */ 2585extern void task_oncpu_function_call(struct task_struct *p, 2586 void (*func) (void *info), void *info); 2587 2588 2589#ifdef CONFIG_MM_OWNER 2590extern void mm_update_next_owner(struct mm_struct *mm); 2591extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); 2592#else 2593static inline void mm_update_next_owner(struct mm_struct *mm) 2594{ 2595} 2596 2597static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) 2598{ 2599} 2600#endif /* CONFIG_MM_OWNER */ 2601 2602static inline unsigned long task_rlimit(const struct task_struct *tsk, 2603 unsigned int limit) 2604{ 2605 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); 2606} 2607 2608static inline unsigned long task_rlimit_max(const struct task_struct *tsk, 2609 unsigned int limit) 2610{ 2611 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); 2612} 2613 2614static inline unsigned long rlimit(unsigned int limit) 2615{ 2616 return task_rlimit(current, limit); 2617} 2618 2619static inline unsigned long rlimit_max(unsigned int limit) 2620{ 2621 return task_rlimit_max(current, limit); 2622} 2623 2624#endif /* __KERNEL__ */ 2625 2626#endif 2627