sched.h revision 4714d1d32d97239fb5ae3e10521d3f133a899b66
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; 102struct blk_plug; 103 104/* 105 * List of flags we want to share for kernel threads, 106 * if only because they are not used by them anyway. 107 */ 108#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 109 110/* 111 * These are the constant used to fake the fixed-point load-average 112 * counting. Some notes: 113 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 114 * a load-average precision of 10 bits integer + 11 bits fractional 115 * - if you want to count load-averages more often, you need more 116 * precision, or rounding will get you. With 2-second counting freq, 117 * the EXP_n values would be 1981, 2034 and 2043 if still using only 118 * 11 bit fractions. 119 */ 120extern unsigned long avenrun[]; /* Load averages */ 121extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); 122 123#define FSHIFT 11 /* nr of bits of precision */ 124#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 125#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ 126#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 127#define EXP_5 2014 /* 1/exp(5sec/5min) */ 128#define EXP_15 2037 /* 1/exp(5sec/15min) */ 129 130#define CALC_LOAD(load,exp,n) \ 131 load *= exp; \ 132 load += n*(FIXED_1-exp); \ 133 load >>= FSHIFT; 134 135extern unsigned long total_forks; 136extern int nr_threads; 137DECLARE_PER_CPU(unsigned long, process_counts); 138extern int nr_processes(void); 139extern unsigned long nr_running(void); 140extern unsigned long nr_uninterruptible(void); 141extern unsigned long nr_iowait(void); 142extern unsigned long nr_iowait_cpu(int cpu); 143extern unsigned long this_cpu_load(void); 144 145 146extern void calc_global_load(unsigned long ticks); 147 148extern unsigned long get_parent_ip(unsigned long addr); 149 150struct seq_file; 151struct cfs_rq; 152struct task_group; 153#ifdef CONFIG_SCHED_DEBUG 154extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 155extern void proc_sched_set_task(struct task_struct *p); 156extern void 157print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 158#else 159static inline void 160proc_sched_show_task(struct task_struct *p, struct seq_file *m) 161{ 162} 163static inline void proc_sched_set_task(struct task_struct *p) 164{ 165} 166static inline void 167print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 168{ 169} 170#endif 171 172/* 173 * Task state bitmask. NOTE! These bits are also 174 * encoded in fs/proc/array.c: get_task_state(). 175 * 176 * We have two separate sets of flags: task->state 177 * is about runnability, while task->exit_state are 178 * about the task exiting. Confusing, but this way 179 * modifying one set can't modify the other one by 180 * mistake. 181 */ 182#define TASK_RUNNING 0 183#define TASK_INTERRUPTIBLE 1 184#define TASK_UNINTERRUPTIBLE 2 185#define __TASK_STOPPED 4 186#define __TASK_TRACED 8 187/* in tsk->exit_state */ 188#define EXIT_ZOMBIE 16 189#define EXIT_DEAD 32 190/* in tsk->state again */ 191#define TASK_DEAD 64 192#define TASK_WAKEKILL 128 193#define TASK_WAKING 256 194#define TASK_STATE_MAX 512 195 196#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW" 197 198extern char ___assert_task_state[1 - 2*!!( 199 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; 200 201/* Convenience macros for the sake of set_task_state */ 202#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) 203#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) 204#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) 205 206/* Convenience macros for the sake of wake_up */ 207#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 208#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) 209 210/* get_task_state() */ 211#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ 212 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ 213 __TASK_TRACED) 214 215#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) 216#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) 217#define task_is_dead(task) ((task)->exit_state != 0) 218#define task_is_stopped_or_traced(task) \ 219 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) 220#define task_contributes_to_load(task) \ 221 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ 222 (task->flags & PF_FREEZING) == 0) 223 224#define __set_task_state(tsk, state_value) \ 225 do { (tsk)->state = (state_value); } while (0) 226#define set_task_state(tsk, state_value) \ 227 set_mb((tsk)->state, (state_value)) 228 229/* 230 * set_current_state() includes a barrier so that the write of current->state 231 * is correctly serialised wrt the caller's subsequent test of whether to 232 * actually sleep: 233 * 234 * set_current_state(TASK_UNINTERRUPTIBLE); 235 * if (do_i_need_to_sleep()) 236 * schedule(); 237 * 238 * If the caller does not need such serialisation then use __set_current_state() 239 */ 240#define __set_current_state(state_value) \ 241 do { current->state = (state_value); } while (0) 242#define set_current_state(state_value) \ 243 set_mb(current->state, (state_value)) 244 245/* Task command name length */ 246#define TASK_COMM_LEN 16 247 248#include <linux/spinlock.h> 249 250/* 251 * This serializes "schedule()" and also protects 252 * the run-queue from deletions/modifications (but 253 * _adding_ to the beginning of the run-queue has 254 * a separate lock). 255 */ 256extern rwlock_t tasklist_lock; 257extern spinlock_t mmlist_lock; 258 259struct task_struct; 260 261#ifdef CONFIG_PROVE_RCU 262extern int lockdep_tasklist_lock_is_held(void); 263#endif /* #ifdef CONFIG_PROVE_RCU */ 264 265extern void sched_init(void); 266extern void sched_init_smp(void); 267extern asmlinkage void schedule_tail(struct task_struct *prev); 268extern void init_idle(struct task_struct *idle, int cpu); 269extern void init_idle_bootup_task(struct task_struct *idle); 270 271extern int runqueue_is_locked(int cpu); 272 273extern cpumask_var_t nohz_cpu_mask; 274#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 275extern void select_nohz_load_balancer(int stop_tick); 276extern int get_nohz_timer_target(void); 277#else 278static inline void select_nohz_load_balancer(int stop_tick) { } 279#endif 280 281/* 282 * Only dump TASK_* tasks. (0 for all tasks) 283 */ 284extern void show_state_filter(unsigned long state_filter); 285 286static inline void show_state(void) 287{ 288 show_state_filter(0); 289} 290 291extern void show_regs(struct pt_regs *); 292 293/* 294 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 295 * task), SP is the stack pointer of the first frame that should be shown in the back 296 * trace (or NULL if the entire call-chain of the task should be shown). 297 */ 298extern void show_stack(struct task_struct *task, unsigned long *sp); 299 300void io_schedule(void); 301long io_schedule_timeout(long timeout); 302 303extern void cpu_init (void); 304extern void trap_init(void); 305extern void update_process_times(int user); 306extern void scheduler_tick(void); 307 308extern void sched_show_task(struct task_struct *p); 309 310#ifdef CONFIG_LOCKUP_DETECTOR 311extern void touch_softlockup_watchdog(void); 312extern void touch_softlockup_watchdog_sync(void); 313extern void touch_all_softlockup_watchdogs(void); 314extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, 315 void __user *buffer, 316 size_t *lenp, loff_t *ppos); 317extern unsigned int softlockup_panic; 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 task_struct *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}; 515 516#include <linux/rwsem.h> 517struct autogroup; 518 519/* 520 * NOTE! "signal_struct" does not have its own 521 * locking, because a shared signal_struct always 522 * implies a shared sighand_struct, so locking 523 * sighand_struct is always a proper superset of 524 * the locking of signal_struct. 525 */ 526struct signal_struct { 527 atomic_t sigcnt; 528 atomic_t live; 529 int nr_threads; 530 531 wait_queue_head_t wait_chldexit; /* for wait4() */ 532 533 /* current thread group signal load-balancing target: */ 534 struct task_struct *curr_target; 535 536 /* shared signal handling: */ 537 struct sigpending shared_pending; 538 539 /* thread group exit support */ 540 int group_exit_code; 541 /* overloaded: 542 * - notify group_exit_task when ->count is equal to notify_count 543 * - everyone except group_exit_task is stopped during signal delivery 544 * of fatal signals, group_exit_task processes the signal. 545 */ 546 int notify_count; 547 struct task_struct *group_exit_task; 548 549 /* thread group stop support, overloads group_exit_code too */ 550 int group_stop_count; 551 unsigned int flags; /* see SIGNAL_* flags below */ 552 553 /* POSIX.1b Interval Timers */ 554 struct list_head posix_timers; 555 556 /* ITIMER_REAL timer for the process */ 557 struct hrtimer real_timer; 558 struct pid *leader_pid; 559 ktime_t it_real_incr; 560 561 /* 562 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use 563 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these 564 * values are defined to 0 and 1 respectively 565 */ 566 struct cpu_itimer it[2]; 567 568 /* 569 * Thread group totals for process CPU timers. 570 * See thread_group_cputimer(), et al, for details. 571 */ 572 struct thread_group_cputimer cputimer; 573 574 /* Earliest-expiration cache. */ 575 struct task_cputime cputime_expires; 576 577 struct list_head cpu_timers[3]; 578 579 struct pid *tty_old_pgrp; 580 581 /* boolean value for session group leader */ 582 int leader; 583 584 struct tty_struct *tty; /* NULL if no tty */ 585 586#ifdef CONFIG_SCHED_AUTOGROUP 587 struct autogroup *autogroup; 588#endif 589 /* 590 * Cumulative resource counters for dead threads in the group, 591 * and for reaped dead child processes forked by this group. 592 * Live threads maintain their own counters and add to these 593 * in __exit_signal, except for the group leader. 594 */ 595 cputime_t utime, stime, cutime, cstime; 596 cputime_t gtime; 597 cputime_t cgtime; 598#ifndef CONFIG_VIRT_CPU_ACCOUNTING 599 cputime_t prev_utime, prev_stime; 600#endif 601 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 602 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 603 unsigned long inblock, oublock, cinblock, coublock; 604 unsigned long maxrss, cmaxrss; 605 struct task_io_accounting ioac; 606 607 /* 608 * Cumulative ns of schedule CPU time fo dead threads in the 609 * group, not including a zombie group leader, (This only differs 610 * from jiffies_to_ns(utime + stime) if sched_clock uses something 611 * other than jiffies.) 612 */ 613 unsigned long long sum_sched_runtime; 614 615 /* 616 * We don't bother to synchronize most readers of this at all, 617 * because there is no reader checking a limit that actually needs 618 * to get both rlim_cur and rlim_max atomically, and either one 619 * alone is a single word that can safely be read normally. 620 * getrlimit/setrlimit use task_lock(current->group_leader) to 621 * protect this instead of the siglock, because they really 622 * have no need to disable irqs. 623 */ 624 struct rlimit rlim[RLIM_NLIMITS]; 625 626#ifdef CONFIG_BSD_PROCESS_ACCT 627 struct pacct_struct pacct; /* per-process accounting information */ 628#endif 629#ifdef CONFIG_TASKSTATS 630 struct taskstats *stats; 631#endif 632#ifdef CONFIG_AUDIT 633 unsigned audit_tty; 634 struct tty_audit_buf *tty_audit_buf; 635#endif 636#ifdef CONFIG_CGROUPS 637 /* 638 * The threadgroup_fork_lock prevents threads from forking with 639 * CLONE_THREAD while held for writing. Use this for fork-sensitive 640 * threadgroup-wide operations. It's taken for reading in fork.c in 641 * copy_process(). 642 * Currently only needed write-side by cgroups. 643 */ 644 struct rw_semaphore threadgroup_fork_lock; 645#endif 646 647 int oom_adj; /* OOM kill score adjustment (bit shift) */ 648 int oom_score_adj; /* OOM kill score adjustment */ 649 int oom_score_adj_min; /* OOM kill score adjustment minimum value. 650 * Only settable by CAP_SYS_RESOURCE. */ 651 652 struct mutex cred_guard_mutex; /* guard against foreign influences on 653 * credential calculations 654 * (notably. ptrace) */ 655}; 656 657/* Context switch must be unlocked if interrupts are to be enabled */ 658#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 659# define __ARCH_WANT_UNLOCKED_CTXSW 660#endif 661 662/* 663 * Bits in flags field of signal_struct. 664 */ 665#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 666#define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ 667#define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ 668/* 669 * Pending notifications to parent. 670 */ 671#define SIGNAL_CLD_STOPPED 0x00000010 672#define SIGNAL_CLD_CONTINUED 0x00000020 673#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) 674 675#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ 676 677/* If true, all threads except ->group_exit_task have pending SIGKILL */ 678static inline int signal_group_exit(const struct signal_struct *sig) 679{ 680 return (sig->flags & SIGNAL_GROUP_EXIT) || 681 (sig->group_exit_task != NULL); 682} 683 684/* 685 * Some day this will be a full-fledged user tracking system.. 686 */ 687struct user_struct { 688 atomic_t __count; /* reference count */ 689 atomic_t processes; /* How many processes does this user have? */ 690 atomic_t files; /* How many open files does this user have? */ 691 atomic_t sigpending; /* How many pending signals does this user have? */ 692#ifdef CONFIG_INOTIFY_USER 693 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 694 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 695#endif 696#ifdef CONFIG_FANOTIFY 697 atomic_t fanotify_listeners; 698#endif 699#ifdef CONFIG_EPOLL 700 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ 701#endif 702#ifdef CONFIG_POSIX_MQUEUE 703 /* protected by mq_lock */ 704 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 705#endif 706 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 707 708#ifdef CONFIG_KEYS 709 struct key *uid_keyring; /* UID specific keyring */ 710 struct key *session_keyring; /* UID's default session keyring */ 711#endif 712 713 /* Hash table maintenance information */ 714 struct hlist_node uidhash_node; 715 uid_t uid; 716 struct user_namespace *user_ns; 717 718#ifdef CONFIG_PERF_EVENTS 719 atomic_long_t locked_vm; 720#endif 721}; 722 723extern int uids_sysfs_init(void); 724 725extern struct user_struct *find_user(uid_t); 726 727extern struct user_struct root_user; 728#define INIT_USER (&root_user) 729 730 731struct backing_dev_info; 732struct reclaim_state; 733 734#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 735struct sched_info { 736 /* cumulative counters */ 737 unsigned long pcount; /* # of times run on this cpu */ 738 unsigned long long run_delay; /* time spent waiting on a runqueue */ 739 740 /* timestamps */ 741 unsigned long long last_arrival,/* when we last ran on a cpu */ 742 last_queued; /* when we were last queued to run */ 743}; 744#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 745 746#ifdef CONFIG_TASK_DELAY_ACCT 747struct task_delay_info { 748 spinlock_t lock; 749 unsigned int flags; /* Private per-task flags */ 750 751 /* For each stat XXX, add following, aligned appropriately 752 * 753 * struct timespec XXX_start, XXX_end; 754 * u64 XXX_delay; 755 * u32 XXX_count; 756 * 757 * Atomicity of updates to XXX_delay, XXX_count protected by 758 * single lock above (split into XXX_lock if contention is an issue). 759 */ 760 761 /* 762 * XXX_count is incremented on every XXX operation, the delay 763 * associated with the operation is added to XXX_delay. 764 * XXX_delay contains the accumulated delay time in nanoseconds. 765 */ 766 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 767 u64 blkio_delay; /* wait for sync block io completion */ 768 u64 swapin_delay; /* wait for swapin block io completion */ 769 u32 blkio_count; /* total count of the number of sync block */ 770 /* io operations performed */ 771 u32 swapin_count; /* total count of the number of swapin block */ 772 /* io operations performed */ 773 774 struct timespec freepages_start, freepages_end; 775 u64 freepages_delay; /* wait for memory reclaim */ 776 u32 freepages_count; /* total count of memory reclaim */ 777}; 778#endif /* CONFIG_TASK_DELAY_ACCT */ 779 780static inline int sched_info_on(void) 781{ 782#ifdef CONFIG_SCHEDSTATS 783 return 1; 784#elif defined(CONFIG_TASK_DELAY_ACCT) 785 extern int delayacct_on; 786 return delayacct_on; 787#else 788 return 0; 789#endif 790} 791 792enum cpu_idle_type { 793 CPU_IDLE, 794 CPU_NOT_IDLE, 795 CPU_NEWLY_IDLE, 796 CPU_MAX_IDLE_TYPES 797}; 798 799/* 800 * Increase resolution of nice-level calculations for 64-bit architectures. 801 * The extra resolution improves shares distribution and load balancing of 802 * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup 803 * hierarchies, especially on larger systems. This is not a user-visible change 804 * and does not change the user-interface for setting shares/weights. 805 * 806 * We increase resolution only if we have enough bits to allow this increased 807 * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution 808 * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the 809 * increased costs. 810 */ 811#if BITS_PER_LONG > 32 812# define SCHED_LOAD_RESOLUTION 10 813# define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION) 814# define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION) 815#else 816# define SCHED_LOAD_RESOLUTION 0 817# define scale_load(w) (w) 818# define scale_load_down(w) (w) 819#endif 820 821#define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION) 822#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 823 824/* 825 * Increase resolution of cpu_power calculations 826 */ 827#define SCHED_POWER_SHIFT 10 828#define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT) 829 830/* 831 * sched-domains (multiprocessor balancing) declarations: 832 */ 833#ifdef CONFIG_SMP 834#define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ 835#define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ 836#define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ 837#define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ 838#define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ 839#define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ 840#define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */ 841#define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ 842#define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */ 843#define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ 844#define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ 845#define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ 846#define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ 847 848enum powersavings_balance_level { 849 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ 850 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package 851 * first for long running threads 852 */ 853 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle 854 * cpu package for power savings 855 */ 856 MAX_POWERSAVINGS_BALANCE_LEVELS 857}; 858 859extern int sched_mc_power_savings, sched_smt_power_savings; 860 861static inline int sd_balance_for_mc_power(void) 862{ 863 if (sched_smt_power_savings) 864 return SD_POWERSAVINGS_BALANCE; 865 866 if (!sched_mc_power_savings) 867 return SD_PREFER_SIBLING; 868 869 return 0; 870} 871 872static inline int sd_balance_for_package_power(void) 873{ 874 if (sched_mc_power_savings | sched_smt_power_savings) 875 return SD_POWERSAVINGS_BALANCE; 876 877 return SD_PREFER_SIBLING; 878} 879 880extern int __weak arch_sd_sibiling_asym_packing(void); 881 882/* 883 * Optimise SD flags for power savings: 884 * SD_BALANCE_NEWIDLE helps aggressive task consolidation and power savings. 885 * Keep default SD flags if sched_{smt,mc}_power_saving=0 886 */ 887 888static inline int sd_power_saving_flags(void) 889{ 890 if (sched_mc_power_savings | sched_smt_power_savings) 891 return SD_BALANCE_NEWIDLE; 892 893 return 0; 894} 895 896struct sched_group { 897 struct sched_group *next; /* Must be a circular list */ 898 atomic_t ref; 899 900 /* 901 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 902 * single CPU. 903 */ 904 unsigned int cpu_power, cpu_power_orig; 905 unsigned int group_weight; 906 907 /* 908 * The CPUs this group covers. 909 * 910 * NOTE: this field is variable length. (Allocated dynamically 911 * by attaching extra space to the end of the structure, 912 * depending on how many CPUs the kernel has booted up with) 913 */ 914 unsigned long cpumask[0]; 915}; 916 917static inline struct cpumask *sched_group_cpus(struct sched_group *sg) 918{ 919 return to_cpumask(sg->cpumask); 920} 921 922struct sched_domain_attr { 923 int relax_domain_level; 924}; 925 926#define SD_ATTR_INIT (struct sched_domain_attr) { \ 927 .relax_domain_level = -1, \ 928} 929 930extern int sched_domain_level_max; 931 932struct sched_domain { 933 /* These fields must be setup */ 934 struct sched_domain *parent; /* top domain must be null terminated */ 935 struct sched_domain *child; /* bottom domain must be null terminated */ 936 struct sched_group *groups; /* the balancing groups of the domain */ 937 unsigned long min_interval; /* Minimum balance interval ms */ 938 unsigned long max_interval; /* Maximum balance interval ms */ 939 unsigned int busy_factor; /* less balancing by factor if busy */ 940 unsigned int imbalance_pct; /* No balance until over watermark */ 941 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 942 unsigned int busy_idx; 943 unsigned int idle_idx; 944 unsigned int newidle_idx; 945 unsigned int wake_idx; 946 unsigned int forkexec_idx; 947 unsigned int smt_gain; 948 int flags; /* See SD_* */ 949 int level; 950 951 /* Runtime fields. */ 952 unsigned long last_balance; /* init to jiffies. units in jiffies */ 953 unsigned int balance_interval; /* initialise to 1. units in ms. */ 954 unsigned int nr_balance_failed; /* initialise to 0 */ 955 956 u64 last_update; 957 958#ifdef CONFIG_SCHEDSTATS 959 /* load_balance() stats */ 960 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 961 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 962 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 963 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 964 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 965 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 966 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 967 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 968 969 /* Active load balancing */ 970 unsigned int alb_count; 971 unsigned int alb_failed; 972 unsigned int alb_pushed; 973 974 /* SD_BALANCE_EXEC stats */ 975 unsigned int sbe_count; 976 unsigned int sbe_balanced; 977 unsigned int sbe_pushed; 978 979 /* SD_BALANCE_FORK stats */ 980 unsigned int sbf_count; 981 unsigned int sbf_balanced; 982 unsigned int sbf_pushed; 983 984 /* try_to_wake_up() stats */ 985 unsigned int ttwu_wake_remote; 986 unsigned int ttwu_move_affine; 987 unsigned int ttwu_move_balance; 988#endif 989#ifdef CONFIG_SCHED_DEBUG 990 char *name; 991#endif 992 union { 993 void *private; /* used during construction */ 994 struct rcu_head rcu; /* used during destruction */ 995 }; 996 997 unsigned int span_weight; 998 /* 999 * Span of all CPUs in this domain. 1000 * 1001 * NOTE: this field is variable length. (Allocated dynamically 1002 * by attaching extra space to the end of the structure, 1003 * depending on how many CPUs the kernel has booted up with) 1004 */ 1005 unsigned long span[0]; 1006}; 1007 1008static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 1009{ 1010 return to_cpumask(sd->span); 1011} 1012 1013extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 1014 struct sched_domain_attr *dattr_new); 1015 1016/* Allocate an array of sched domains, for partition_sched_domains(). */ 1017cpumask_var_t *alloc_sched_domains(unsigned int ndoms); 1018void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); 1019 1020/* Test a flag in parent sched domain */ 1021static inline int test_sd_parent(struct sched_domain *sd, int flag) 1022{ 1023 if (sd->parent && (sd->parent->flags & flag)) 1024 return 1; 1025 1026 return 0; 1027} 1028 1029unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); 1030unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); 1031 1032#else /* CONFIG_SMP */ 1033 1034struct sched_domain_attr; 1035 1036static inline void 1037partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 1038 struct sched_domain_attr *dattr_new) 1039{ 1040} 1041#endif /* !CONFIG_SMP */ 1042 1043 1044struct io_context; /* See blkdev.h */ 1045 1046 1047#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 1048extern void prefetch_stack(struct task_struct *t); 1049#else 1050static inline void prefetch_stack(struct task_struct *t) { } 1051#endif 1052 1053struct audit_context; /* See audit.c */ 1054struct mempolicy; 1055struct pipe_inode_info; 1056struct uts_namespace; 1057 1058struct rq; 1059struct sched_domain; 1060 1061/* 1062 * wake flags 1063 */ 1064#define WF_SYNC 0x01 /* waker goes to sleep after wakup */ 1065#define WF_FORK 0x02 /* child wakeup after fork */ 1066 1067#define ENQUEUE_WAKEUP 1 1068#define ENQUEUE_HEAD 2 1069#ifdef CONFIG_SMP 1070#define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */ 1071#else 1072#define ENQUEUE_WAKING 0 1073#endif 1074 1075#define DEQUEUE_SLEEP 1 1076 1077struct sched_class { 1078 const struct sched_class *next; 1079 1080 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); 1081 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); 1082 void (*yield_task) (struct rq *rq); 1083 bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt); 1084 1085 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); 1086 1087 struct task_struct * (*pick_next_task) (struct rq *rq); 1088 void (*put_prev_task) (struct rq *rq, struct task_struct *p); 1089 1090#ifdef CONFIG_SMP 1091 int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags); 1092 1093 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); 1094 void (*post_schedule) (struct rq *this_rq); 1095 void (*task_waking) (struct task_struct *task); 1096 void (*task_woken) (struct rq *this_rq, struct task_struct *task); 1097 1098 void (*set_cpus_allowed)(struct task_struct *p, 1099 const struct cpumask *newmask); 1100 1101 void (*rq_online)(struct rq *rq); 1102 void (*rq_offline)(struct rq *rq); 1103#endif 1104 1105 void (*set_curr_task) (struct rq *rq); 1106 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 1107 void (*task_fork) (struct task_struct *p); 1108 1109 void (*switched_from) (struct rq *this_rq, struct task_struct *task); 1110 void (*switched_to) (struct rq *this_rq, struct task_struct *task); 1111 void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 1112 int oldprio); 1113 1114 unsigned int (*get_rr_interval) (struct rq *rq, 1115 struct task_struct *task); 1116 1117#ifdef CONFIG_FAIR_GROUP_SCHED 1118 void (*task_move_group) (struct task_struct *p, int on_rq); 1119#endif 1120}; 1121 1122struct load_weight { 1123 unsigned long weight, inv_weight; 1124}; 1125 1126#ifdef CONFIG_SCHEDSTATS 1127struct sched_statistics { 1128 u64 wait_start; 1129 u64 wait_max; 1130 u64 wait_count; 1131 u64 wait_sum; 1132 u64 iowait_count; 1133 u64 iowait_sum; 1134 1135 u64 sleep_start; 1136 u64 sleep_max; 1137 s64 sum_sleep_runtime; 1138 1139 u64 block_start; 1140 u64 block_max; 1141 u64 exec_max; 1142 u64 slice_max; 1143 1144 u64 nr_migrations_cold; 1145 u64 nr_failed_migrations_affine; 1146 u64 nr_failed_migrations_running; 1147 u64 nr_failed_migrations_hot; 1148 u64 nr_forced_migrations; 1149 1150 u64 nr_wakeups; 1151 u64 nr_wakeups_sync; 1152 u64 nr_wakeups_migrate; 1153 u64 nr_wakeups_local; 1154 u64 nr_wakeups_remote; 1155 u64 nr_wakeups_affine; 1156 u64 nr_wakeups_affine_attempts; 1157 u64 nr_wakeups_passive; 1158 u64 nr_wakeups_idle; 1159}; 1160#endif 1161 1162struct sched_entity { 1163 struct load_weight load; /* for load-balancing */ 1164 struct rb_node run_node; 1165 struct list_head group_node; 1166 unsigned int on_rq; 1167 1168 u64 exec_start; 1169 u64 sum_exec_runtime; 1170 u64 vruntime; 1171 u64 prev_sum_exec_runtime; 1172 1173 u64 nr_migrations; 1174 1175#ifdef CONFIG_SCHEDSTATS 1176 struct sched_statistics statistics; 1177#endif 1178 1179#ifdef CONFIG_FAIR_GROUP_SCHED 1180 struct sched_entity *parent; 1181 /* rq on which this entity is (to be) queued: */ 1182 struct cfs_rq *cfs_rq; 1183 /* rq "owned" by this entity/group: */ 1184 struct cfs_rq *my_q; 1185#endif 1186}; 1187 1188struct sched_rt_entity { 1189 struct list_head run_list; 1190 unsigned long timeout; 1191 unsigned int time_slice; 1192 int nr_cpus_allowed; 1193 1194 struct sched_rt_entity *back; 1195#ifdef CONFIG_RT_GROUP_SCHED 1196 struct sched_rt_entity *parent; 1197 /* rq on which this entity is (to be) queued: */ 1198 struct rt_rq *rt_rq; 1199 /* rq "owned" by this entity/group: */ 1200 struct rt_rq *my_q; 1201#endif 1202}; 1203 1204struct rcu_node; 1205 1206enum perf_event_task_context { 1207 perf_invalid_context = -1, 1208 perf_hw_context = 0, 1209 perf_sw_context, 1210 perf_nr_task_contexts, 1211}; 1212 1213struct task_struct { 1214 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 1215 void *stack; 1216 atomic_t usage; 1217 unsigned int flags; /* per process flags, defined below */ 1218 unsigned int ptrace; 1219 1220#ifdef CONFIG_SMP 1221 struct task_struct *wake_entry; 1222 int on_cpu; 1223#endif 1224 int on_rq; 1225 1226 int prio, static_prio, normal_prio; 1227 unsigned int rt_priority; 1228 const struct sched_class *sched_class; 1229 struct sched_entity se; 1230 struct sched_rt_entity rt; 1231 1232#ifdef CONFIG_PREEMPT_NOTIFIERS 1233 /* list of struct preempt_notifier: */ 1234 struct hlist_head preempt_notifiers; 1235#endif 1236 1237 /* 1238 * fpu_counter contains the number of consecutive context switches 1239 * that the FPU is used. If this is over a threshold, the lazy fpu 1240 * saving becomes unlazy to save the trap. This is an unsigned char 1241 * so that after 256 times the counter wraps and the behavior turns 1242 * lazy again; this to deal with bursty apps that only use FPU for 1243 * a short time 1244 */ 1245 unsigned char fpu_counter; 1246#ifdef CONFIG_BLK_DEV_IO_TRACE 1247 unsigned int btrace_seq; 1248#endif 1249 1250 unsigned int policy; 1251 cpumask_t cpus_allowed; 1252 1253#ifdef CONFIG_PREEMPT_RCU 1254 int rcu_read_lock_nesting; 1255 char rcu_read_unlock_special; 1256 struct list_head rcu_node_entry; 1257#endif /* #ifdef CONFIG_PREEMPT_RCU */ 1258#ifdef CONFIG_TREE_PREEMPT_RCU 1259 struct rcu_node *rcu_blocked_node; 1260#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ 1261#ifdef CONFIG_RCU_BOOST 1262 struct rt_mutex *rcu_boost_mutex; 1263#endif /* #ifdef CONFIG_RCU_BOOST */ 1264 1265#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 1266 struct sched_info sched_info; 1267#endif 1268 1269 struct list_head tasks; 1270#ifdef CONFIG_SMP 1271 struct plist_node pushable_tasks; 1272#endif 1273 1274 struct mm_struct *mm, *active_mm; 1275#ifdef CONFIG_COMPAT_BRK 1276 unsigned brk_randomized:1; 1277#endif 1278#if defined(SPLIT_RSS_COUNTING) 1279 struct task_rss_stat rss_stat; 1280#endif 1281/* task state */ 1282 int exit_state; 1283 int exit_code, exit_signal; 1284 int pdeath_signal; /* The signal sent when the parent dies */ 1285 unsigned int group_stop; /* GROUP_STOP_*, siglock protected */ 1286 /* ??? */ 1287 unsigned int personality; 1288 unsigned did_exec:1; 1289 unsigned in_execve:1; /* Tell the LSMs that the process is doing an 1290 * execve */ 1291 unsigned in_iowait:1; 1292 1293 1294 /* Revert to default priority/policy when forking */ 1295 unsigned sched_reset_on_fork:1; 1296 unsigned sched_contributes_to_load:1; 1297 1298 pid_t pid; 1299 pid_t tgid; 1300 1301#ifdef CONFIG_CC_STACKPROTECTOR 1302 /* Canary value for the -fstack-protector gcc feature */ 1303 unsigned long stack_canary; 1304#endif 1305 1306 /* 1307 * pointers to (original) parent process, youngest child, younger sibling, 1308 * older sibling, respectively. (p->father can be replaced with 1309 * p->real_parent->pid) 1310 */ 1311 struct task_struct *real_parent; /* real parent process */ 1312 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ 1313 /* 1314 * children/sibling forms the list of my natural children 1315 */ 1316 struct list_head children; /* list of my children */ 1317 struct list_head sibling; /* linkage in my parent's children list */ 1318 struct task_struct *group_leader; /* threadgroup leader */ 1319 1320 /* 1321 * ptraced is the list of tasks this task is using ptrace on. 1322 * This includes both natural children and PTRACE_ATTACH targets. 1323 * p->ptrace_entry is p's link on the p->parent->ptraced list. 1324 */ 1325 struct list_head ptraced; 1326 struct list_head ptrace_entry; 1327 1328 /* PID/PID hash table linkage. */ 1329 struct pid_link pids[PIDTYPE_MAX]; 1330 struct list_head thread_group; 1331 1332 struct completion *vfork_done; /* for vfork() */ 1333 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1334 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1335 1336 cputime_t utime, stime, utimescaled, stimescaled; 1337 cputime_t gtime; 1338#ifndef CONFIG_VIRT_CPU_ACCOUNTING 1339 cputime_t prev_utime, prev_stime; 1340#endif 1341 unsigned long nvcsw, nivcsw; /* context switch counts */ 1342 struct timespec start_time; /* monotonic time */ 1343 struct timespec real_start_time; /* boot based time */ 1344/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1345 unsigned long min_flt, maj_flt; 1346 1347 struct task_cputime cputime_expires; 1348 struct list_head cpu_timers[3]; 1349 1350/* process credentials */ 1351 const struct cred __rcu *real_cred; /* objective and real subjective task 1352 * credentials (COW) */ 1353 const struct cred __rcu *cred; /* effective (overridable) subjective task 1354 * credentials (COW) */ 1355 struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */ 1356 1357 char comm[TASK_COMM_LEN]; /* executable name excluding path 1358 - access with [gs]et_task_comm (which lock 1359 it with task_lock()) 1360 - initialized normally by setup_new_exec */ 1361/* file system info */ 1362 int link_count, total_link_count; 1363#ifdef CONFIG_SYSVIPC 1364/* ipc stuff */ 1365 struct sysv_sem sysvsem; 1366#endif 1367#ifdef CONFIG_DETECT_HUNG_TASK 1368/* hung task detection */ 1369 unsigned long last_switch_count; 1370#endif 1371/* CPU-specific state of this task */ 1372 struct thread_struct thread; 1373/* filesystem information */ 1374 struct fs_struct *fs; 1375/* open file information */ 1376 struct files_struct *files; 1377/* namespaces */ 1378 struct nsproxy *nsproxy; 1379/* signal handlers */ 1380 struct signal_struct *signal; 1381 struct sighand_struct *sighand; 1382 1383 sigset_t blocked, real_blocked; 1384 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ 1385 struct sigpending pending; 1386 1387 unsigned long sas_ss_sp; 1388 size_t sas_ss_size; 1389 int (*notifier)(void *priv); 1390 void *notifier_data; 1391 sigset_t *notifier_mask; 1392 struct audit_context *audit_context; 1393#ifdef CONFIG_AUDITSYSCALL 1394 uid_t loginuid; 1395 unsigned int sessionid; 1396#endif 1397 seccomp_t seccomp; 1398 1399/* Thread group tracking */ 1400 u32 parent_exec_id; 1401 u32 self_exec_id; 1402/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, 1403 * mempolicy */ 1404 spinlock_t alloc_lock; 1405 1406#ifdef CONFIG_GENERIC_HARDIRQS 1407 /* IRQ handler threads */ 1408 struct irqaction *irqaction; 1409#endif 1410 1411 /* Protection of the PI data structures: */ 1412 raw_spinlock_t pi_lock; 1413 1414#ifdef CONFIG_RT_MUTEXES 1415 /* PI waiters blocked on a rt_mutex held by this task */ 1416 struct plist_head pi_waiters; 1417 /* Deadlock detection and priority inheritance handling */ 1418 struct rt_mutex_waiter *pi_blocked_on; 1419#endif 1420 1421#ifdef CONFIG_DEBUG_MUTEXES 1422 /* mutex deadlock detection */ 1423 struct mutex_waiter *blocked_on; 1424#endif 1425#ifdef CONFIG_TRACE_IRQFLAGS 1426 unsigned int irq_events; 1427 unsigned long hardirq_enable_ip; 1428 unsigned long hardirq_disable_ip; 1429 unsigned int hardirq_enable_event; 1430 unsigned int hardirq_disable_event; 1431 int hardirqs_enabled; 1432 int hardirq_context; 1433 unsigned long softirq_disable_ip; 1434 unsigned long softirq_enable_ip; 1435 unsigned int softirq_disable_event; 1436 unsigned int softirq_enable_event; 1437 int softirqs_enabled; 1438 int softirq_context; 1439#endif 1440#ifdef CONFIG_LOCKDEP 1441# define MAX_LOCK_DEPTH 48UL 1442 u64 curr_chain_key; 1443 int lockdep_depth; 1444 unsigned int lockdep_recursion; 1445 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1446 gfp_t lockdep_reclaim_gfp; 1447#endif 1448 1449/* journalling filesystem info */ 1450 void *journal_info; 1451 1452/* stacked block device info */ 1453 struct bio_list *bio_list; 1454 1455#ifdef CONFIG_BLOCK 1456/* stack plugging */ 1457 struct blk_plug *plug; 1458#endif 1459 1460/* VM state */ 1461 struct reclaim_state *reclaim_state; 1462 1463 struct backing_dev_info *backing_dev_info; 1464 1465 struct io_context *io_context; 1466 1467 unsigned long ptrace_message; 1468 siginfo_t *last_siginfo; /* For ptrace use. */ 1469 struct task_io_accounting ioac; 1470#if defined(CONFIG_TASK_XACCT) 1471 u64 acct_rss_mem1; /* accumulated rss usage */ 1472 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1473 cputime_t acct_timexpd; /* stime + utime since last update */ 1474#endif 1475#ifdef CONFIG_CPUSETS 1476 nodemask_t mems_allowed; /* Protected by alloc_lock */ 1477 int mems_allowed_change_disable; 1478 int cpuset_mem_spread_rotor; 1479 int cpuset_slab_spread_rotor; 1480#endif 1481#ifdef CONFIG_CGROUPS 1482 /* Control Group info protected by css_set_lock */ 1483 struct css_set __rcu *cgroups; 1484 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1485 struct list_head cg_list; 1486#endif 1487#ifdef CONFIG_FUTEX 1488 struct robust_list_head __user *robust_list; 1489#ifdef CONFIG_COMPAT 1490 struct compat_robust_list_head __user *compat_robust_list; 1491#endif 1492 struct list_head pi_state_list; 1493 struct futex_pi_state *pi_state_cache; 1494#endif 1495#ifdef CONFIG_PERF_EVENTS 1496 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; 1497 struct mutex perf_event_mutex; 1498 struct list_head perf_event_list; 1499#endif 1500#ifdef CONFIG_NUMA 1501 struct mempolicy *mempolicy; /* Protected by alloc_lock */ 1502 short il_next; 1503 short pref_node_fork; 1504#endif 1505 atomic_t fs_excl; /* holding fs exclusive resources */ 1506 struct rcu_head rcu; 1507 1508 /* 1509 * cache last used pipe for splice 1510 */ 1511 struct pipe_inode_info *splice_pipe; 1512#ifdef CONFIG_TASK_DELAY_ACCT 1513 struct task_delay_info *delays; 1514#endif 1515#ifdef CONFIG_FAULT_INJECTION 1516 int make_it_fail; 1517#endif 1518 struct prop_local_single dirties; 1519#ifdef CONFIG_LATENCYTOP 1520 int latency_record_count; 1521 struct latency_record latency_record[LT_SAVECOUNT]; 1522#endif 1523 /* 1524 * time slack values; these are used to round up poll() and 1525 * select() etc timeout values. These are in nanoseconds. 1526 */ 1527 unsigned long timer_slack_ns; 1528 unsigned long default_timer_slack_ns; 1529 1530 struct list_head *scm_work_list; 1531#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1532 /* Index of current stored address in ret_stack */ 1533 int curr_ret_stack; 1534 /* Stack of return addresses for return function tracing */ 1535 struct ftrace_ret_stack *ret_stack; 1536 /* time stamp for last schedule */ 1537 unsigned long long ftrace_timestamp; 1538 /* 1539 * Number of functions that haven't been traced 1540 * because of depth overrun. 1541 */ 1542 atomic_t trace_overrun; 1543 /* Pause for the tracing */ 1544 atomic_t tracing_graph_pause; 1545#endif 1546#ifdef CONFIG_TRACING 1547 /* state flags for use by tracers */ 1548 unsigned long trace; 1549 /* bitmask of trace recursion */ 1550 unsigned long trace_recursion; 1551#endif /* CONFIG_TRACING */ 1552#ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */ 1553 struct memcg_batch_info { 1554 int do_batch; /* incremented when batch uncharge started */ 1555 struct mem_cgroup *memcg; /* target memcg of uncharge */ 1556 unsigned long nr_pages; /* uncharged usage */ 1557 unsigned long memsw_nr_pages; /* uncharged mem+swap usage */ 1558 } memcg_batch; 1559#endif 1560#ifdef CONFIG_HAVE_HW_BREAKPOINT 1561 atomic_t ptrace_bp_refcnt; 1562#endif 1563}; 1564 1565/* Future-safe accessor for struct task_struct's cpus_allowed. */ 1566#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) 1567 1568/* 1569 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1570 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1571 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1572 * values are inverted: lower p->prio value means higher priority. 1573 * 1574 * The MAX_USER_RT_PRIO value allows the actual maximum 1575 * RT priority to be separate from the value exported to 1576 * user-space. This allows kernel threads to set their 1577 * priority to a value higher than any user task. Note: 1578 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1579 */ 1580 1581#define MAX_USER_RT_PRIO 100 1582#define MAX_RT_PRIO MAX_USER_RT_PRIO 1583 1584#define MAX_PRIO (MAX_RT_PRIO + 40) 1585#define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1586 1587static inline int rt_prio(int prio) 1588{ 1589 if (unlikely(prio < MAX_RT_PRIO)) 1590 return 1; 1591 return 0; 1592} 1593 1594static inline int rt_task(struct task_struct *p) 1595{ 1596 return rt_prio(p->prio); 1597} 1598 1599static inline struct pid *task_pid(struct task_struct *task) 1600{ 1601 return task->pids[PIDTYPE_PID].pid; 1602} 1603 1604static inline struct pid *task_tgid(struct task_struct *task) 1605{ 1606 return task->group_leader->pids[PIDTYPE_PID].pid; 1607} 1608 1609/* 1610 * Without tasklist or rcu lock it is not safe to dereference 1611 * the result of task_pgrp/task_session even if task == current, 1612 * we can race with another thread doing sys_setsid/sys_setpgid. 1613 */ 1614static inline struct pid *task_pgrp(struct task_struct *task) 1615{ 1616 return task->group_leader->pids[PIDTYPE_PGID].pid; 1617} 1618 1619static inline struct pid *task_session(struct task_struct *task) 1620{ 1621 return task->group_leader->pids[PIDTYPE_SID].pid; 1622} 1623 1624struct pid_namespace; 1625 1626/* 1627 * the helpers to get the task's different pids as they are seen 1628 * from various namespaces 1629 * 1630 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1631 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 1632 * current. 1633 * task_xid_nr_ns() : id seen from the ns specified; 1634 * 1635 * set_task_vxid() : assigns a virtual id to a task; 1636 * 1637 * see also pid_nr() etc in include/linux/pid.h 1638 */ 1639pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, 1640 struct pid_namespace *ns); 1641 1642static inline pid_t task_pid_nr(struct task_struct *tsk) 1643{ 1644 return tsk->pid; 1645} 1646 1647static inline pid_t task_pid_nr_ns(struct task_struct *tsk, 1648 struct pid_namespace *ns) 1649{ 1650 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); 1651} 1652 1653static inline pid_t task_pid_vnr(struct task_struct *tsk) 1654{ 1655 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); 1656} 1657 1658 1659static inline pid_t task_tgid_nr(struct task_struct *tsk) 1660{ 1661 return tsk->tgid; 1662} 1663 1664pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1665 1666static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1667{ 1668 return pid_vnr(task_tgid(tsk)); 1669} 1670 1671 1672static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, 1673 struct pid_namespace *ns) 1674{ 1675 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); 1676} 1677 1678static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1679{ 1680 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); 1681} 1682 1683 1684static inline pid_t task_session_nr_ns(struct task_struct *tsk, 1685 struct pid_namespace *ns) 1686{ 1687 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); 1688} 1689 1690static inline pid_t task_session_vnr(struct task_struct *tsk) 1691{ 1692 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); 1693} 1694 1695/* obsolete, do not use */ 1696static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1697{ 1698 return task_pgrp_nr_ns(tsk, &init_pid_ns); 1699} 1700 1701/** 1702 * pid_alive - check that a task structure is not stale 1703 * @p: Task structure to be checked. 1704 * 1705 * Test if a process is not yet dead (at most zombie state) 1706 * If pid_alive fails, then pointers within the task structure 1707 * can be stale and must not be dereferenced. 1708 */ 1709static inline int pid_alive(struct task_struct *p) 1710{ 1711 return p->pids[PIDTYPE_PID].pid != NULL; 1712} 1713 1714/** 1715 * is_global_init - check if a task structure is init 1716 * @tsk: Task structure to be checked. 1717 * 1718 * Check if a task structure is the first user space task the kernel created. 1719 */ 1720static inline int is_global_init(struct task_struct *tsk) 1721{ 1722 return tsk->pid == 1; 1723} 1724 1725/* 1726 * is_container_init: 1727 * check whether in the task is init in its own pid namespace. 1728 */ 1729extern int is_container_init(struct task_struct *tsk); 1730 1731extern struct pid *cad_pid; 1732 1733extern void free_task(struct task_struct *tsk); 1734#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1735 1736extern void __put_task_struct(struct task_struct *t); 1737 1738static inline void put_task_struct(struct task_struct *t) 1739{ 1740 if (atomic_dec_and_test(&t->usage)) 1741 __put_task_struct(t); 1742} 1743 1744extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st); 1745extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st); 1746 1747/* 1748 * Per process flags 1749 */ 1750#define PF_STARTING 0x00000002 /* being created */ 1751#define PF_EXITING 0x00000004 /* getting shut down */ 1752#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1753#define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1754#define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ 1755#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1756#define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ 1757#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1758#define PF_DUMPCORE 0x00000200 /* dumped core */ 1759#define PF_SIGNALED 0x00000400 /* killed by a signal */ 1760#define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1761#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1762#define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */ 1763#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1764#define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1765#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1766#define PF_KSWAPD 0x00040000 /* I am kswapd */ 1767#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1768#define PF_KTHREAD 0x00200000 /* I am a kernel thread */ 1769#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1770#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1771#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1772#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1773#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ 1774#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ 1775#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1776#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1777#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ 1778#define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ 1779 1780/* 1781 * Only the _current_ task can read/write to tsk->flags, but other 1782 * tasks can access tsk->flags in readonly mode for example 1783 * with tsk_used_math (like during threaded core dumping). 1784 * There is however an exception to this rule during ptrace 1785 * or during fork: the ptracer task is allowed to write to the 1786 * child->flags of its traced child (same goes for fork, the parent 1787 * can write to the child->flags), because we're guaranteed the 1788 * child is not running and in turn not changing child->flags 1789 * at the same time the parent does it. 1790 */ 1791#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1792#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1793#define clear_used_math() clear_stopped_child_used_math(current) 1794#define set_used_math() set_stopped_child_used_math(current) 1795#define conditional_stopped_child_used_math(condition, child) \ 1796 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1797#define conditional_used_math(condition) \ 1798 conditional_stopped_child_used_math(condition, current) 1799#define copy_to_stopped_child_used_math(child) \ 1800 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1801/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1802#define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1803#define used_math() tsk_used_math(current) 1804 1805/* 1806 * task->group_stop flags 1807 */ 1808#define GROUP_STOP_SIGMASK 0xffff /* signr of the last group stop */ 1809#define GROUP_STOP_PENDING (1 << 16) /* task should stop for group stop */ 1810#define GROUP_STOP_CONSUME (1 << 17) /* consume group stop count */ 1811#define GROUP_STOP_TRAPPING (1 << 18) /* switching from STOPPED to TRACED */ 1812#define GROUP_STOP_DEQUEUED (1 << 19) /* stop signal dequeued */ 1813 1814extern void task_clear_group_stop_pending(struct task_struct *task); 1815 1816#ifdef CONFIG_PREEMPT_RCU 1817 1818#define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ 1819#define RCU_READ_UNLOCK_BOOSTED (1 << 1) /* boosted while in RCU read-side. */ 1820#define RCU_READ_UNLOCK_NEED_QS (1 << 2) /* RCU core needs CPU response. */ 1821 1822static inline void rcu_copy_process(struct task_struct *p) 1823{ 1824 p->rcu_read_lock_nesting = 0; 1825 p->rcu_read_unlock_special = 0; 1826#ifdef CONFIG_TREE_PREEMPT_RCU 1827 p->rcu_blocked_node = NULL; 1828#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ 1829#ifdef CONFIG_RCU_BOOST 1830 p->rcu_boost_mutex = NULL; 1831#endif /* #ifdef CONFIG_RCU_BOOST */ 1832 INIT_LIST_HEAD(&p->rcu_node_entry); 1833} 1834 1835#else 1836 1837static inline void rcu_copy_process(struct task_struct *p) 1838{ 1839} 1840 1841#endif 1842 1843#ifdef CONFIG_SMP 1844extern int set_cpus_allowed_ptr(struct task_struct *p, 1845 const struct cpumask *new_mask); 1846#else 1847static inline int set_cpus_allowed_ptr(struct task_struct *p, 1848 const struct cpumask *new_mask) 1849{ 1850 if (!cpumask_test_cpu(0, new_mask)) 1851 return -EINVAL; 1852 return 0; 1853} 1854#endif 1855 1856#ifndef CONFIG_CPUMASK_OFFSTACK 1857static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1858{ 1859 return set_cpus_allowed_ptr(p, &new_mask); 1860} 1861#endif 1862 1863/* 1864 * Do not use outside of architecture code which knows its limitations. 1865 * 1866 * sched_clock() has no promise of monotonicity or bounded drift between 1867 * CPUs, use (which you should not) requires disabling IRQs. 1868 * 1869 * Please use one of the three interfaces below. 1870 */ 1871extern unsigned long long notrace sched_clock(void); 1872/* 1873 * See the comment in kernel/sched_clock.c 1874 */ 1875extern u64 cpu_clock(int cpu); 1876extern u64 local_clock(void); 1877extern u64 sched_clock_cpu(int cpu); 1878 1879 1880extern void sched_clock_init(void); 1881 1882#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1883static inline void sched_clock_tick(void) 1884{ 1885} 1886 1887static inline void sched_clock_idle_sleep_event(void) 1888{ 1889} 1890 1891static inline void sched_clock_idle_wakeup_event(u64 delta_ns) 1892{ 1893} 1894#else 1895/* 1896 * Architectures can set this to 1 if they have specified 1897 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, 1898 * but then during bootup it turns out that sched_clock() 1899 * is reliable after all: 1900 */ 1901extern int sched_clock_stable; 1902 1903extern void sched_clock_tick(void); 1904extern void sched_clock_idle_sleep_event(void); 1905extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1906#endif 1907 1908#ifdef CONFIG_IRQ_TIME_ACCOUNTING 1909/* 1910 * An i/f to runtime opt-in for irq time accounting based off of sched_clock. 1911 * The reason for this explicit opt-in is not to have perf penalty with 1912 * slow sched_clocks. 1913 */ 1914extern void enable_sched_clock_irqtime(void); 1915extern void disable_sched_clock_irqtime(void); 1916#else 1917static inline void enable_sched_clock_irqtime(void) {} 1918static inline void disable_sched_clock_irqtime(void) {} 1919#endif 1920 1921extern unsigned long long 1922task_sched_runtime(struct task_struct *task); 1923extern unsigned long long thread_group_sched_runtime(struct task_struct *task); 1924 1925/* sched_exec is called by processes performing an exec */ 1926#ifdef CONFIG_SMP 1927extern void sched_exec(void); 1928#else 1929#define sched_exec() {} 1930#endif 1931 1932extern void sched_clock_idle_sleep_event(void); 1933extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1934 1935#ifdef CONFIG_HOTPLUG_CPU 1936extern void idle_task_exit(void); 1937#else 1938static inline void idle_task_exit(void) {} 1939#endif 1940 1941#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) 1942extern void wake_up_idle_cpu(int cpu); 1943#else 1944static inline void wake_up_idle_cpu(int cpu) { } 1945#endif 1946 1947extern unsigned int sysctl_sched_latency; 1948extern unsigned int sysctl_sched_min_granularity; 1949extern unsigned int sysctl_sched_wakeup_granularity; 1950extern unsigned int sysctl_sched_child_runs_first; 1951 1952enum sched_tunable_scaling { 1953 SCHED_TUNABLESCALING_NONE, 1954 SCHED_TUNABLESCALING_LOG, 1955 SCHED_TUNABLESCALING_LINEAR, 1956 SCHED_TUNABLESCALING_END, 1957}; 1958extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; 1959 1960#ifdef CONFIG_SCHED_DEBUG 1961extern unsigned int sysctl_sched_migration_cost; 1962extern unsigned int sysctl_sched_nr_migrate; 1963extern unsigned int sysctl_sched_time_avg; 1964extern unsigned int sysctl_timer_migration; 1965extern unsigned int sysctl_sched_shares_window; 1966 1967int sched_proc_update_handler(struct ctl_table *table, int write, 1968 void __user *buffer, size_t *length, 1969 loff_t *ppos); 1970#endif 1971#ifdef CONFIG_SCHED_DEBUG 1972static inline unsigned int get_sysctl_timer_migration(void) 1973{ 1974 return sysctl_timer_migration; 1975} 1976#else 1977static inline unsigned int get_sysctl_timer_migration(void) 1978{ 1979 return 1; 1980} 1981#endif 1982extern unsigned int sysctl_sched_rt_period; 1983extern int sysctl_sched_rt_runtime; 1984 1985int sched_rt_handler(struct ctl_table *table, int write, 1986 void __user *buffer, size_t *lenp, 1987 loff_t *ppos); 1988 1989#ifdef CONFIG_SCHED_AUTOGROUP 1990extern unsigned int sysctl_sched_autogroup_enabled; 1991 1992extern void sched_autogroup_create_attach(struct task_struct *p); 1993extern void sched_autogroup_detach(struct task_struct *p); 1994extern void sched_autogroup_fork(struct signal_struct *sig); 1995extern void sched_autogroup_exit(struct signal_struct *sig); 1996#ifdef CONFIG_PROC_FS 1997extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); 1998extern int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice); 1999#endif 2000#else 2001static inline void sched_autogroup_create_attach(struct task_struct *p) { } 2002static inline void sched_autogroup_detach(struct task_struct *p) { } 2003static inline void sched_autogroup_fork(struct signal_struct *sig) { } 2004static inline void sched_autogroup_exit(struct signal_struct *sig) { } 2005#endif 2006 2007#ifdef CONFIG_RT_MUTEXES 2008extern int rt_mutex_getprio(struct task_struct *p); 2009extern void rt_mutex_setprio(struct task_struct *p, int prio); 2010extern void rt_mutex_adjust_pi(struct task_struct *p); 2011#else 2012static inline int rt_mutex_getprio(struct task_struct *p) 2013{ 2014 return p->normal_prio; 2015} 2016# define rt_mutex_adjust_pi(p) do { } while (0) 2017#endif 2018 2019extern bool yield_to(struct task_struct *p, bool preempt); 2020extern void set_user_nice(struct task_struct *p, long nice); 2021extern int task_prio(const struct task_struct *p); 2022extern int task_nice(const struct task_struct *p); 2023extern int can_nice(const struct task_struct *p, const int nice); 2024extern int task_curr(const struct task_struct *p); 2025extern int idle_cpu(int cpu); 2026extern int sched_setscheduler(struct task_struct *, int, 2027 const struct sched_param *); 2028extern int sched_setscheduler_nocheck(struct task_struct *, int, 2029 const struct sched_param *); 2030extern struct task_struct *idle_task(int cpu); 2031extern struct task_struct *curr_task(int cpu); 2032extern void set_curr_task(int cpu, struct task_struct *p); 2033 2034void yield(void); 2035 2036/* 2037 * The default (Linux) execution domain. 2038 */ 2039extern struct exec_domain default_exec_domain; 2040 2041union thread_union { 2042 struct thread_info thread_info; 2043 unsigned long stack[THREAD_SIZE/sizeof(long)]; 2044}; 2045 2046#ifndef __HAVE_ARCH_KSTACK_END 2047static inline int kstack_end(void *addr) 2048{ 2049 /* Reliable end of stack detection: 2050 * Some APM bios versions misalign the stack 2051 */ 2052 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 2053} 2054#endif 2055 2056extern union thread_union init_thread_union; 2057extern struct task_struct init_task; 2058 2059extern struct mm_struct init_mm; 2060 2061extern struct pid_namespace init_pid_ns; 2062 2063/* 2064 * find a task by one of its numerical ids 2065 * 2066 * find_task_by_pid_ns(): 2067 * finds a task by its pid in the specified namespace 2068 * find_task_by_vpid(): 2069 * finds a task by its virtual pid 2070 * 2071 * see also find_vpid() etc in include/linux/pid.h 2072 */ 2073 2074extern struct task_struct *find_task_by_vpid(pid_t nr); 2075extern struct task_struct *find_task_by_pid_ns(pid_t nr, 2076 struct pid_namespace *ns); 2077 2078extern void __set_special_pids(struct pid *pid); 2079 2080/* per-UID process charging. */ 2081extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 2082static inline struct user_struct *get_uid(struct user_struct *u) 2083{ 2084 atomic_inc(&u->__count); 2085 return u; 2086} 2087extern void free_uid(struct user_struct *); 2088extern void release_uids(struct user_namespace *ns); 2089 2090#include <asm/current.h> 2091 2092extern void xtime_update(unsigned long ticks); 2093 2094extern int wake_up_state(struct task_struct *tsk, unsigned int state); 2095extern int wake_up_process(struct task_struct *tsk); 2096extern void wake_up_new_task(struct task_struct *tsk); 2097#ifdef CONFIG_SMP 2098 extern void kick_process(struct task_struct *tsk); 2099#else 2100 static inline void kick_process(struct task_struct *tsk) { } 2101#endif 2102extern void sched_fork(struct task_struct *p); 2103extern void sched_dead(struct task_struct *p); 2104 2105extern void proc_caches_init(void); 2106extern void flush_signals(struct task_struct *); 2107extern void __flush_signals(struct task_struct *); 2108extern void ignore_signals(struct task_struct *); 2109extern void flush_signal_handlers(struct task_struct *, int force_default); 2110extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 2111 2112static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 2113{ 2114 unsigned long flags; 2115 int ret; 2116 2117 spin_lock_irqsave(&tsk->sighand->siglock, flags); 2118 ret = dequeue_signal(tsk, mask, info); 2119 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 2120 2121 return ret; 2122} 2123 2124extern void block_all_signals(int (*notifier)(void *priv), void *priv, 2125 sigset_t *mask); 2126extern void unblock_all_signals(void); 2127extern void release_task(struct task_struct * p); 2128extern int send_sig_info(int, struct siginfo *, struct task_struct *); 2129extern int force_sigsegv(int, struct task_struct *); 2130extern int force_sig_info(int, struct siginfo *, struct task_struct *); 2131extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 2132extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 2133extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 2134extern int kill_pgrp(struct pid *pid, int sig, int priv); 2135extern int kill_pid(struct pid *pid, int sig, int priv); 2136extern int kill_proc_info(int, struct siginfo *, pid_t); 2137extern int do_notify_parent(struct task_struct *, int); 2138extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); 2139extern void force_sig(int, struct task_struct *); 2140extern int send_sig(int, struct task_struct *, int); 2141extern int zap_other_threads(struct task_struct *p); 2142extern struct sigqueue *sigqueue_alloc(void); 2143extern void sigqueue_free(struct sigqueue *); 2144extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); 2145extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 2146extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 2147 2148static inline int kill_cad_pid(int sig, int priv) 2149{ 2150 return kill_pid(cad_pid, sig, priv); 2151} 2152 2153/* These can be the second arg to send_sig_info/send_group_sig_info. */ 2154#define SEND_SIG_NOINFO ((struct siginfo *) 0) 2155#define SEND_SIG_PRIV ((struct siginfo *) 1) 2156#define SEND_SIG_FORCED ((struct siginfo *) 2) 2157 2158/* 2159 * True if we are on the alternate signal stack. 2160 */ 2161static inline int on_sig_stack(unsigned long sp) 2162{ 2163#ifdef CONFIG_STACK_GROWSUP 2164 return sp >= current->sas_ss_sp && 2165 sp - current->sas_ss_sp < current->sas_ss_size; 2166#else 2167 return sp > current->sas_ss_sp && 2168 sp - current->sas_ss_sp <= current->sas_ss_size; 2169#endif 2170} 2171 2172static inline int sas_ss_flags(unsigned long sp) 2173{ 2174 return (current->sas_ss_size == 0 ? SS_DISABLE 2175 : on_sig_stack(sp) ? SS_ONSTACK : 0); 2176} 2177 2178/* 2179 * Routines for handling mm_structs 2180 */ 2181extern struct mm_struct * mm_alloc(void); 2182 2183/* mmdrop drops the mm and the page tables */ 2184extern void __mmdrop(struct mm_struct *); 2185static inline void mmdrop(struct mm_struct * mm) 2186{ 2187 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 2188 __mmdrop(mm); 2189} 2190extern int mm_init_cpumask(struct mm_struct *mm, struct mm_struct *oldmm); 2191 2192/* mmput gets rid of the mappings and all user-space */ 2193extern void mmput(struct mm_struct *); 2194/* Grab a reference to a task's mm, if it is not already going away */ 2195extern struct mm_struct *get_task_mm(struct task_struct *task); 2196/* Remove the current tasks stale references to the old mm_struct */ 2197extern void mm_release(struct task_struct *, struct mm_struct *); 2198/* Allocate a new mm structure and copy contents from tsk->mm */ 2199extern struct mm_struct *dup_mm(struct task_struct *tsk); 2200 2201extern int copy_thread(unsigned long, unsigned long, unsigned long, 2202 struct task_struct *, struct pt_regs *); 2203extern void flush_thread(void); 2204extern void exit_thread(void); 2205 2206extern void exit_files(struct task_struct *); 2207extern void __cleanup_sighand(struct sighand_struct *); 2208 2209extern void exit_itimers(struct signal_struct *); 2210extern void flush_itimer_signals(void); 2211 2212extern NORET_TYPE void do_group_exit(int); 2213 2214extern void daemonize(const char *, ...); 2215extern int allow_signal(int); 2216extern int disallow_signal(int); 2217 2218extern int do_execve(const char *, 2219 const char __user * const __user *, 2220 const char __user * const __user *, struct pt_regs *); 2221extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 2222struct task_struct *fork_idle(int); 2223 2224extern void set_task_comm(struct task_struct *tsk, char *from); 2225extern char *get_task_comm(char *to, struct task_struct *tsk); 2226 2227#ifdef CONFIG_SMP 2228void scheduler_ipi(void); 2229extern unsigned long wait_task_inactive(struct task_struct *, long match_state); 2230#else 2231static inline void scheduler_ipi(void) { } 2232static inline unsigned long wait_task_inactive(struct task_struct *p, 2233 long match_state) 2234{ 2235 return 1; 2236} 2237#endif 2238 2239#define next_task(p) \ 2240 list_entry_rcu((p)->tasks.next, struct task_struct, tasks) 2241 2242#define for_each_process(p) \ 2243 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 2244 2245extern bool current_is_single_threaded(void); 2246 2247/* 2248 * Careful: do_each_thread/while_each_thread is a double loop so 2249 * 'break' will not work as expected - use goto instead. 2250 */ 2251#define do_each_thread(g, t) \ 2252 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 2253 2254#define while_each_thread(g, t) \ 2255 while ((t = next_thread(t)) != g) 2256 2257static inline int get_nr_threads(struct task_struct *tsk) 2258{ 2259 return tsk->signal->nr_threads; 2260} 2261 2262/* de_thread depends on thread_group_leader not being a pid based check */ 2263#define thread_group_leader(p) (p == p->group_leader) 2264 2265/* Do to the insanities of de_thread it is possible for a process 2266 * to have the pid of the thread group leader without actually being 2267 * the thread group leader. For iteration through the pids in proc 2268 * all we care about is that we have a task with the appropriate 2269 * pid, we don't actually care if we have the right task. 2270 */ 2271static inline int has_group_leader_pid(struct task_struct *p) 2272{ 2273 return p->pid == p->tgid; 2274} 2275 2276static inline 2277int same_thread_group(struct task_struct *p1, struct task_struct *p2) 2278{ 2279 return p1->tgid == p2->tgid; 2280} 2281 2282static inline struct task_struct *next_thread(const struct task_struct *p) 2283{ 2284 return list_entry_rcu(p->thread_group.next, 2285 struct task_struct, thread_group); 2286} 2287 2288static inline int thread_group_empty(struct task_struct *p) 2289{ 2290 return list_empty(&p->thread_group); 2291} 2292 2293#define delay_group_leader(p) \ 2294 (thread_group_leader(p) && !thread_group_empty(p)) 2295 2296static inline int task_detached(struct task_struct *p) 2297{ 2298 return p->exit_signal == -1; 2299} 2300 2301/* 2302 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 2303 * subscriptions and synchronises with wait4(). Also used in procfs. Also 2304 * pins the final release of task.io_context. Also protects ->cpuset and 2305 * ->cgroup.subsys[]. 2306 * 2307 * Nests both inside and outside of read_lock(&tasklist_lock). 2308 * It must not be nested with write_lock_irq(&tasklist_lock), 2309 * neither inside nor outside. 2310 */ 2311static inline void task_lock(struct task_struct *p) 2312{ 2313 spin_lock(&p->alloc_lock); 2314} 2315 2316static inline void task_unlock(struct task_struct *p) 2317{ 2318 spin_unlock(&p->alloc_lock); 2319} 2320 2321extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, 2322 unsigned long *flags); 2323 2324#define lock_task_sighand(tsk, flags) \ 2325({ struct sighand_struct *__ss; \ 2326 __cond_lock(&(tsk)->sighand->siglock, \ 2327 (__ss = __lock_task_sighand(tsk, flags))); \ 2328 __ss; \ 2329}) \ 2330 2331static inline void unlock_task_sighand(struct task_struct *tsk, 2332 unsigned long *flags) 2333{ 2334 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 2335} 2336 2337/* See the declaration of threadgroup_fork_lock in signal_struct. */ 2338#ifdef CONFIG_CGROUPS 2339static inline void threadgroup_fork_read_lock(struct task_struct *tsk) 2340{ 2341 down_read(&tsk->signal->threadgroup_fork_lock); 2342} 2343static inline void threadgroup_fork_read_unlock(struct task_struct *tsk) 2344{ 2345 up_read(&tsk->signal->threadgroup_fork_lock); 2346} 2347static inline void threadgroup_fork_write_lock(struct task_struct *tsk) 2348{ 2349 down_write(&tsk->signal->threadgroup_fork_lock); 2350} 2351static inline void threadgroup_fork_write_unlock(struct task_struct *tsk) 2352{ 2353 up_write(&tsk->signal->threadgroup_fork_lock); 2354} 2355#else 2356static inline void threadgroup_fork_read_lock(struct task_struct *tsk) {} 2357static inline void threadgroup_fork_read_unlock(struct task_struct *tsk) {} 2358static inline void threadgroup_fork_write_lock(struct task_struct *tsk) {} 2359static inline void threadgroup_fork_write_unlock(struct task_struct *tsk) {} 2360#endif 2361 2362#ifndef __HAVE_THREAD_FUNCTIONS 2363 2364#define task_thread_info(task) ((struct thread_info *)(task)->stack) 2365#define task_stack_page(task) ((task)->stack) 2366 2367static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 2368{ 2369 *task_thread_info(p) = *task_thread_info(org); 2370 task_thread_info(p)->task = p; 2371} 2372 2373static inline unsigned long *end_of_stack(struct task_struct *p) 2374{ 2375 return (unsigned long *)(task_thread_info(p) + 1); 2376} 2377 2378#endif 2379 2380static inline int object_is_on_stack(void *obj) 2381{ 2382 void *stack = task_stack_page(current); 2383 2384 return (obj >= stack) && (obj < (stack + THREAD_SIZE)); 2385} 2386 2387extern void thread_info_cache_init(void); 2388 2389#ifdef CONFIG_DEBUG_STACK_USAGE 2390static inline unsigned long stack_not_used(struct task_struct *p) 2391{ 2392 unsigned long *n = end_of_stack(p); 2393 2394 do { /* Skip over canary */ 2395 n++; 2396 } while (!*n); 2397 2398 return (unsigned long)n - (unsigned long)end_of_stack(p); 2399} 2400#endif 2401 2402/* set thread flags in other task's structures 2403 * - see asm/thread_info.h for TIF_xxxx flags available 2404 */ 2405static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 2406{ 2407 set_ti_thread_flag(task_thread_info(tsk), flag); 2408} 2409 2410static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2411{ 2412 clear_ti_thread_flag(task_thread_info(tsk), flag); 2413} 2414 2415static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 2416{ 2417 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 2418} 2419 2420static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2421{ 2422 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 2423} 2424 2425static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 2426{ 2427 return test_ti_thread_flag(task_thread_info(tsk), flag); 2428} 2429 2430static inline void set_tsk_need_resched(struct task_struct *tsk) 2431{ 2432 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2433} 2434 2435static inline void clear_tsk_need_resched(struct task_struct *tsk) 2436{ 2437 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2438} 2439 2440static inline int test_tsk_need_resched(struct task_struct *tsk) 2441{ 2442 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); 2443} 2444 2445static inline int restart_syscall(void) 2446{ 2447 set_tsk_thread_flag(current, TIF_SIGPENDING); 2448 return -ERESTARTNOINTR; 2449} 2450 2451static inline int signal_pending(struct task_struct *p) 2452{ 2453 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 2454} 2455 2456static inline int __fatal_signal_pending(struct task_struct *p) 2457{ 2458 return unlikely(sigismember(&p->pending.signal, SIGKILL)); 2459} 2460 2461static inline int fatal_signal_pending(struct task_struct *p) 2462{ 2463 return signal_pending(p) && __fatal_signal_pending(p); 2464} 2465 2466static inline int signal_pending_state(long state, struct task_struct *p) 2467{ 2468 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) 2469 return 0; 2470 if (!signal_pending(p)) 2471 return 0; 2472 2473 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); 2474} 2475 2476static inline int need_resched(void) 2477{ 2478 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 2479} 2480 2481/* 2482 * cond_resched() and cond_resched_lock(): latency reduction via 2483 * explicit rescheduling in places that are safe. The return 2484 * value indicates whether a reschedule was done in fact. 2485 * cond_resched_lock() will drop the spinlock before scheduling, 2486 * cond_resched_softirq() will enable bhs before scheduling. 2487 */ 2488extern int _cond_resched(void); 2489 2490#define cond_resched() ({ \ 2491 __might_sleep(__FILE__, __LINE__, 0); \ 2492 _cond_resched(); \ 2493}) 2494 2495extern int __cond_resched_lock(spinlock_t *lock); 2496 2497#ifdef CONFIG_PREEMPT 2498#define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET 2499#else 2500#define PREEMPT_LOCK_OFFSET 0 2501#endif 2502 2503#define cond_resched_lock(lock) ({ \ 2504 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ 2505 __cond_resched_lock(lock); \ 2506}) 2507 2508extern int __cond_resched_softirq(void); 2509 2510#define cond_resched_softirq() ({ \ 2511 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ 2512 __cond_resched_softirq(); \ 2513}) 2514 2515/* 2516 * Does a critical section need to be broken due to another 2517 * task waiting?: (technically does not depend on CONFIG_PREEMPT, 2518 * but a general need for low latency) 2519 */ 2520static inline int spin_needbreak(spinlock_t *lock) 2521{ 2522#ifdef CONFIG_PREEMPT 2523 return spin_is_contended(lock); 2524#else 2525 return 0; 2526#endif 2527} 2528 2529/* 2530 * Thread group CPU time accounting. 2531 */ 2532void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); 2533void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); 2534 2535static inline void thread_group_cputime_init(struct signal_struct *sig) 2536{ 2537 spin_lock_init(&sig->cputimer.lock); 2538} 2539 2540/* 2541 * Reevaluate whether the task has signals pending delivery. 2542 * Wake the task if so. 2543 * This is required every time the blocked sigset_t changes. 2544 * callers must hold sighand->siglock. 2545 */ 2546extern void recalc_sigpending_and_wake(struct task_struct *t); 2547extern void recalc_sigpending(void); 2548 2549extern void signal_wake_up(struct task_struct *t, int resume_stopped); 2550 2551/* 2552 * Wrappers for p->thread_info->cpu access. No-op on UP. 2553 */ 2554#ifdef CONFIG_SMP 2555 2556static inline unsigned int task_cpu(const struct task_struct *p) 2557{ 2558 return task_thread_info(p)->cpu; 2559} 2560 2561extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 2562 2563#else 2564 2565static inline unsigned int task_cpu(const struct task_struct *p) 2566{ 2567 return 0; 2568} 2569 2570static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 2571{ 2572} 2573 2574#endif /* CONFIG_SMP */ 2575 2576extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); 2577extern long sched_getaffinity(pid_t pid, struct cpumask *mask); 2578 2579extern void normalize_rt_tasks(void); 2580 2581#ifdef CONFIG_CGROUP_SCHED 2582 2583extern struct task_group root_task_group; 2584 2585extern struct task_group *sched_create_group(struct task_group *parent); 2586extern void sched_destroy_group(struct task_group *tg); 2587extern void sched_move_task(struct task_struct *tsk); 2588#ifdef CONFIG_FAIR_GROUP_SCHED 2589extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 2590extern unsigned long sched_group_shares(struct task_group *tg); 2591#endif 2592#ifdef CONFIG_RT_GROUP_SCHED 2593extern int sched_group_set_rt_runtime(struct task_group *tg, 2594 long rt_runtime_us); 2595extern long sched_group_rt_runtime(struct task_group *tg); 2596extern int sched_group_set_rt_period(struct task_group *tg, 2597 long rt_period_us); 2598extern long sched_group_rt_period(struct task_group *tg); 2599extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); 2600#endif 2601#endif 2602 2603extern int task_can_switch_user(struct user_struct *up, 2604 struct task_struct *tsk); 2605 2606#ifdef CONFIG_TASK_XACCT 2607static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2608{ 2609 tsk->ioac.rchar += amt; 2610} 2611 2612static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2613{ 2614 tsk->ioac.wchar += amt; 2615} 2616 2617static inline void inc_syscr(struct task_struct *tsk) 2618{ 2619 tsk->ioac.syscr++; 2620} 2621 2622static inline void inc_syscw(struct task_struct *tsk) 2623{ 2624 tsk->ioac.syscw++; 2625} 2626#else 2627static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2628{ 2629} 2630 2631static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2632{ 2633} 2634 2635static inline void inc_syscr(struct task_struct *tsk) 2636{ 2637} 2638 2639static inline void inc_syscw(struct task_struct *tsk) 2640{ 2641} 2642#endif 2643 2644#ifndef TASK_SIZE_OF 2645#define TASK_SIZE_OF(tsk) TASK_SIZE 2646#endif 2647 2648#ifdef CONFIG_MM_OWNER 2649extern void mm_update_next_owner(struct mm_struct *mm); 2650extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); 2651#else 2652static inline void mm_update_next_owner(struct mm_struct *mm) 2653{ 2654} 2655 2656static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) 2657{ 2658} 2659#endif /* CONFIG_MM_OWNER */ 2660 2661static inline unsigned long task_rlimit(const struct task_struct *tsk, 2662 unsigned int limit) 2663{ 2664 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); 2665} 2666 2667static inline unsigned long task_rlimit_max(const struct task_struct *tsk, 2668 unsigned int limit) 2669{ 2670 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); 2671} 2672 2673static inline unsigned long rlimit(unsigned int limit) 2674{ 2675 return task_rlimit(current, limit); 2676} 2677 2678static inline unsigned long rlimit_max(unsigned int limit) 2679{ 2680 return task_rlimit_max(current, limit); 2681} 2682 2683#endif /* __KERNEL__ */ 2684 2685#endif 2686