sched.h revision e1781538cf5c870ab696e9b8f0a5c498d3900f2f
1#ifndef _LINUX_SCHED_H 2#define _LINUX_SCHED_H 3 4/* 5 * cloning flags: 6 */ 7#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ 8#define CLONE_VM 0x00000100 /* set if VM shared between processes */ 9#define CLONE_FS 0x00000200 /* set if fs info shared between processes */ 10#define CLONE_FILES 0x00000400 /* set if open files shared between processes */ 11#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ 12#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ 13#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ 14#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ 15#define CLONE_THREAD 0x00010000 /* Same thread group? */ 16#define CLONE_NEWNS 0x00020000 /* New namespace group? */ 17#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ 18#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ 19#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ 20#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ 21#define CLONE_DETACHED 0x00400000 /* Unused, ignored */ 22#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ 23#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ 24#define CLONE_STOPPED 0x02000000 /* Start in stopped state */ 25#define CLONE_NEWUTS 0x04000000 /* New utsname group? */ 26#define CLONE_NEWIPC 0x08000000 /* New ipcs */ 27#define CLONE_NEWUSER 0x10000000 /* New user namespace */ 28#define CLONE_NEWPID 0x20000000 /* New pid namespace */ 29#define CLONE_NEWNET 0x40000000 /* New network namespace */ 30#define CLONE_IO 0x80000000 /* Clone io context */ 31 32/* 33 * Scheduling policies 34 */ 35#define SCHED_NORMAL 0 36#define SCHED_FIFO 1 37#define SCHED_RR 2 38#define SCHED_BATCH 3 39/* SCHED_ISO: reserved but not implemented yet */ 40#define SCHED_IDLE 5 41/* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */ 42#define SCHED_RESET_ON_FORK 0x40000000 43 44#ifdef __KERNEL__ 45 46struct sched_param { 47 int sched_priority; 48}; 49 50#include <asm/param.h> /* for HZ */ 51 52#include <linux/capability.h> 53#include <linux/threads.h> 54#include <linux/kernel.h> 55#include <linux/types.h> 56#include <linux/timex.h> 57#include <linux/jiffies.h> 58#include <linux/rbtree.h> 59#include <linux/thread_info.h> 60#include <linux/cpumask.h> 61#include <linux/errno.h> 62#include <linux/nodemask.h> 63#include <linux/mm_types.h> 64 65#include <asm/system.h> 66#include <asm/page.h> 67#include <asm/ptrace.h> 68#include <asm/cputime.h> 69 70#include <linux/smp.h> 71#include <linux/sem.h> 72#include <linux/signal.h> 73#include <linux/path.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/kobject.h> 92#include <linux/latencytop.h> 93#include <linux/cred.h> 94 95#include <asm/processor.h> 96 97struct exec_domain; 98struct futex_pi_state; 99struct robust_list_head; 100struct bio; 101struct fs_struct; 102struct bts_context; 103struct perf_event_context; 104 105/* 106 * List of flags we want to share for kernel threads, 107 * if only because they are not used by them anyway. 108 */ 109#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 110 111/* 112 * These are the constant used to fake the fixed-point load-average 113 * counting. Some notes: 114 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 115 * a load-average precision of 10 bits integer + 11 bits fractional 116 * - if you want to count load-averages more often, you need more 117 * precision, or rounding will get you. With 2-second counting freq, 118 * the EXP_n values would be 1981, 2034 and 2043 if still using only 119 * 11 bit fractions. 120 */ 121extern unsigned long avenrun[]; /* Load averages */ 122extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); 123 124#define FSHIFT 11 /* nr of bits of precision */ 125#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 126#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ 127#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 128#define EXP_5 2014 /* 1/exp(5sec/5min) */ 129#define EXP_15 2037 /* 1/exp(5sec/15min) */ 130 131#define CALC_LOAD(load,exp,n) \ 132 load *= exp; \ 133 load += n*(FIXED_1-exp); \ 134 load >>= FSHIFT; 135 136extern unsigned long total_forks; 137extern int nr_threads; 138DECLARE_PER_CPU(unsigned long, process_counts); 139extern int nr_processes(void); 140extern unsigned long nr_running(void); 141extern unsigned long nr_uninterruptible(void); 142extern unsigned long nr_iowait(void); 143extern unsigned long nr_iowait_cpu(void); 144extern unsigned long this_cpu_load(void); 145 146 147extern void calc_global_load(void); 148 149extern unsigned long get_parent_ip(unsigned long addr); 150 151struct seq_file; 152struct cfs_rq; 153struct task_group; 154#ifdef CONFIG_SCHED_DEBUG 155extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 156extern void proc_sched_set_task(struct task_struct *p); 157extern void 158print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 159#else 160static inline void 161proc_sched_show_task(struct task_struct *p, struct seq_file *m) 162{ 163} 164static inline void proc_sched_set_task(struct task_struct *p) 165{ 166} 167static inline void 168print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 169{ 170} 171#endif 172 173/* 174 * Task state bitmask. NOTE! These bits are also 175 * encoded in fs/proc/array.c: get_task_state(). 176 * 177 * We have two separate sets of flags: task->state 178 * is about runnability, while task->exit_state are 179 * about the task exiting. Confusing, but this way 180 * modifying one set can't modify the other one by 181 * mistake. 182 */ 183#define TASK_RUNNING 0 184#define TASK_INTERRUPTIBLE 1 185#define TASK_UNINTERRUPTIBLE 2 186#define __TASK_STOPPED 4 187#define __TASK_TRACED 8 188/* in tsk->exit_state */ 189#define EXIT_ZOMBIE 16 190#define EXIT_DEAD 32 191/* in tsk->state again */ 192#define TASK_DEAD 64 193#define TASK_WAKEKILL 128 194#define TASK_WAKING 256 195#define TASK_STATE_MAX 512 196 197#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW" 198 199extern char ___assert_task_state[1 - 2*!!( 200 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; 201 202/* Convenience macros for the sake of set_task_state */ 203#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) 204#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) 205#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) 206 207/* Convenience macros for the sake of wake_up */ 208#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 209#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) 210 211/* get_task_state() */ 212#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ 213 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ 214 __TASK_TRACED) 215 216#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) 217#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 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 261extern void sched_init(void); 262extern void sched_init_smp(void); 263extern asmlinkage void schedule_tail(struct task_struct *prev); 264extern void init_idle(struct task_struct *idle, int cpu); 265extern void init_idle_bootup_task(struct task_struct *idle); 266 267extern int runqueue_is_locked(int cpu); 268extern void task_rq_unlock_wait(struct task_struct *p); 269 270extern cpumask_var_t nohz_cpu_mask; 271#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 272extern int select_nohz_load_balancer(int cpu); 273extern int get_nohz_load_balancer(void); 274#else 275static inline int select_nohz_load_balancer(int cpu) 276{ 277 return 0; 278} 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_DETECT_SOFTLOCKUP 311extern void softlockup_tick(void); 312extern void touch_softlockup_watchdog(void); 313extern void touch_all_softlockup_watchdogs(void); 314extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write, 315 void __user *buffer, 316 size_t *lenp, loff_t *ppos); 317extern unsigned int softlockup_panic; 318extern int softlockup_thresh; 319#else 320static inline void softlockup_tick(void) 321{ 322} 323static inline void touch_softlockup_watchdog(void) 324{ 325} 326static inline void touch_all_softlockup_watchdogs(void) 327{ 328} 329#endif 330 331#ifdef CONFIG_DETECT_HUNG_TASK 332extern unsigned int sysctl_hung_task_panic; 333extern unsigned long sysctl_hung_task_check_count; 334extern unsigned long sysctl_hung_task_timeout_secs; 335extern unsigned long sysctl_hung_task_warnings; 336extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, 337 void __user *buffer, 338 size_t *lenp, loff_t *ppos); 339#endif 340 341/* Attach to any functions which should be ignored in wchan output. */ 342#define __sched __attribute__((__section__(".sched.text"))) 343 344/* Linker adds these: start and end of __sched functions */ 345extern char __sched_text_start[], __sched_text_end[]; 346 347/* Is this address in the __sched functions? */ 348extern int in_sched_functions(unsigned long addr); 349 350#define MAX_SCHEDULE_TIMEOUT LONG_MAX 351extern signed long schedule_timeout(signed long timeout); 352extern signed long schedule_timeout_interruptible(signed long timeout); 353extern signed long schedule_timeout_killable(signed long timeout); 354extern signed long schedule_timeout_uninterruptible(signed long timeout); 355asmlinkage void schedule(void); 356extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner); 357 358struct nsproxy; 359struct user_namespace; 360 361/* 362 * Default maximum number of active map areas, this limits the number of vmas 363 * per mm struct. Users can overwrite this number by sysctl but there is a 364 * problem. 365 * 366 * When a program's coredump is generated as ELF format, a section is created 367 * per a vma. In ELF, the number of sections is represented in unsigned short. 368 * This means the number of sections should be smaller than 65535 at coredump. 369 * Because the kernel adds some informative sections to a image of program at 370 * generating coredump, we need some margin. The number of extra sections is 371 * 1-3 now and depends on arch. We use "5" as safe margin, here. 372 */ 373#define MAPCOUNT_ELF_CORE_MARGIN (5) 374#define DEFAULT_MAX_MAP_COUNT (USHORT_MAX - MAPCOUNT_ELF_CORE_MARGIN) 375 376extern int sysctl_max_map_count; 377 378#include <linux/aio.h> 379 380extern unsigned long 381arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 382 unsigned long, unsigned long); 383extern unsigned long 384arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 385 unsigned long len, unsigned long pgoff, 386 unsigned long flags); 387extern void arch_unmap_area(struct mm_struct *, unsigned long); 388extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 389 390#if USE_SPLIT_PTLOCKS 391/* 392 * The mm counters are not protected by its page_table_lock, 393 * so must be incremented atomically. 394 */ 395#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) 396#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) 397#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) 398#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) 399#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) 400 401#else /* !USE_SPLIT_PTLOCKS */ 402/* 403 * The mm counters are protected by its page_table_lock, 404 * so can be incremented directly. 405 */ 406#define set_mm_counter(mm, member, value) (mm)->_##member = (value) 407#define get_mm_counter(mm, member) ((mm)->_##member) 408#define add_mm_counter(mm, member, value) (mm)->_##member += (value) 409#define inc_mm_counter(mm, member) (mm)->_##member++ 410#define dec_mm_counter(mm, member) (mm)->_##member-- 411 412#endif /* !USE_SPLIT_PTLOCKS */ 413 414#define get_mm_rss(mm) \ 415 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) 416#define update_hiwater_rss(mm) do { \ 417 unsigned long _rss = get_mm_rss(mm); \ 418 if ((mm)->hiwater_rss < _rss) \ 419 (mm)->hiwater_rss = _rss; \ 420} while (0) 421#define update_hiwater_vm(mm) do { \ 422 if ((mm)->hiwater_vm < (mm)->total_vm) \ 423 (mm)->hiwater_vm = (mm)->total_vm; \ 424} while (0) 425 426static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) 427{ 428 return max(mm->hiwater_rss, get_mm_rss(mm)); 429} 430 431static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, 432 struct mm_struct *mm) 433{ 434 unsigned long hiwater_rss = get_mm_hiwater_rss(mm); 435 436 if (*maxrss < hiwater_rss) 437 *maxrss = hiwater_rss; 438} 439 440static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) 441{ 442 return max(mm->hiwater_vm, mm->total_vm); 443} 444 445extern void set_dumpable(struct mm_struct *mm, int value); 446extern int get_dumpable(struct mm_struct *mm); 447 448/* mm flags */ 449/* dumpable bits */ 450#define MMF_DUMPABLE 0 /* core dump is permitted */ 451#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 452 453#define MMF_DUMPABLE_BITS 2 454#define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) 455 456/* coredump filter bits */ 457#define MMF_DUMP_ANON_PRIVATE 2 458#define MMF_DUMP_ANON_SHARED 3 459#define MMF_DUMP_MAPPED_PRIVATE 4 460#define MMF_DUMP_MAPPED_SHARED 5 461#define MMF_DUMP_ELF_HEADERS 6 462#define MMF_DUMP_HUGETLB_PRIVATE 7 463#define MMF_DUMP_HUGETLB_SHARED 8 464 465#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 466#define MMF_DUMP_FILTER_BITS 7 467#define MMF_DUMP_FILTER_MASK \ 468 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 469#define MMF_DUMP_FILTER_DEFAULT \ 470 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ 471 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) 472 473#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS 474# define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) 475#else 476# define MMF_DUMP_MASK_DEFAULT_ELF 0 477#endif 478 /* leave room for more dump flags */ 479#define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ 480 481#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) 482 483struct sighand_struct { 484 atomic_t count; 485 struct k_sigaction action[_NSIG]; 486 spinlock_t siglock; 487 wait_queue_head_t signalfd_wqh; 488}; 489 490struct pacct_struct { 491 int ac_flag; 492 long ac_exitcode; 493 unsigned long ac_mem; 494 cputime_t ac_utime, ac_stime; 495 unsigned long ac_minflt, ac_majflt; 496}; 497 498struct cpu_itimer { 499 cputime_t expires; 500 cputime_t incr; 501 u32 error; 502 u32 incr_error; 503}; 504 505/** 506 * struct task_cputime - collected CPU time counts 507 * @utime: time spent in user mode, in &cputime_t units 508 * @stime: time spent in kernel mode, in &cputime_t units 509 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds 510 * 511 * This structure groups together three kinds of CPU time that are 512 * tracked for threads and thread groups. Most things considering 513 * CPU time want to group these counts together and treat all three 514 * of them in parallel. 515 */ 516struct task_cputime { 517 cputime_t utime; 518 cputime_t stime; 519 unsigned long long sum_exec_runtime; 520}; 521/* Alternate field names when used to cache expirations. */ 522#define prof_exp stime 523#define virt_exp utime 524#define sched_exp sum_exec_runtime 525 526#define INIT_CPUTIME \ 527 (struct task_cputime) { \ 528 .utime = cputime_zero, \ 529 .stime = cputime_zero, \ 530 .sum_exec_runtime = 0, \ 531 } 532 533/* 534 * Disable preemption until the scheduler is running. 535 * Reset by start_kernel()->sched_init()->init_idle(). 536 * 537 * We include PREEMPT_ACTIVE to avoid cond_resched() from working 538 * before the scheduler is active -- see should_resched(). 539 */ 540#define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) 541 542/** 543 * struct thread_group_cputimer - thread group interval timer counts 544 * @cputime: thread group interval timers. 545 * @running: non-zero when there are timers running and 546 * @cputime receives updates. 547 * @lock: lock for fields in this struct. 548 * 549 * This structure contains the version of task_cputime, above, that is 550 * used for thread group CPU timer calculations. 551 */ 552struct thread_group_cputimer { 553 struct task_cputime cputime; 554 int running; 555 spinlock_t lock; 556}; 557 558/* 559 * NOTE! "signal_struct" does not have it's own 560 * locking, because a shared signal_struct always 561 * implies a shared sighand_struct, so locking 562 * sighand_struct is always a proper superset of 563 * the locking of signal_struct. 564 */ 565struct signal_struct { 566 atomic_t count; 567 atomic_t live; 568 569 wait_queue_head_t wait_chldexit; /* for wait4() */ 570 571 /* current thread group signal load-balancing target: */ 572 struct task_struct *curr_target; 573 574 /* shared signal handling: */ 575 struct sigpending shared_pending; 576 577 /* thread group exit support */ 578 int group_exit_code; 579 /* overloaded: 580 * - notify group_exit_task when ->count is equal to notify_count 581 * - everyone except group_exit_task is stopped during signal delivery 582 * of fatal signals, group_exit_task processes the signal. 583 */ 584 int notify_count; 585 struct task_struct *group_exit_task; 586 587 /* thread group stop support, overloads group_exit_code too */ 588 int group_stop_count; 589 unsigned int flags; /* see SIGNAL_* flags below */ 590 591 /* POSIX.1b Interval Timers */ 592 struct list_head posix_timers; 593 594 /* ITIMER_REAL timer for the process */ 595 struct hrtimer real_timer; 596 struct pid *leader_pid; 597 ktime_t it_real_incr; 598 599 /* 600 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use 601 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these 602 * values are defined to 0 and 1 respectively 603 */ 604 struct cpu_itimer it[2]; 605 606 /* 607 * Thread group totals for process CPU timers. 608 * See thread_group_cputimer(), et al, for details. 609 */ 610 struct thread_group_cputimer cputimer; 611 612 /* Earliest-expiration cache. */ 613 struct task_cputime cputime_expires; 614 615 struct list_head cpu_timers[3]; 616 617 struct pid *tty_old_pgrp; 618 619 /* boolean value for session group leader */ 620 int leader; 621 622 struct tty_struct *tty; /* NULL if no tty */ 623 624 /* 625 * Cumulative resource counters for dead threads in the group, 626 * and for reaped dead child processes forked by this group. 627 * Live threads maintain their own counters and add to these 628 * in __exit_signal, except for the group leader. 629 */ 630 cputime_t utime, stime, cutime, cstime; 631 cputime_t gtime; 632 cputime_t cgtime; 633#ifndef CONFIG_VIRT_CPU_ACCOUNTING 634 cputime_t prev_utime, prev_stime; 635#endif 636 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 637 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 638 unsigned long inblock, oublock, cinblock, coublock; 639 unsigned long maxrss, cmaxrss; 640 struct task_io_accounting ioac; 641 642 /* 643 * Cumulative ns of schedule CPU time fo dead threads in the 644 * group, not including a zombie group leader, (This only differs 645 * from jiffies_to_ns(utime + stime) if sched_clock uses something 646 * other than jiffies.) 647 */ 648 unsigned long long sum_sched_runtime; 649 650 /* 651 * We don't bother to synchronize most readers of this at all, 652 * because there is no reader checking a limit that actually needs 653 * to get both rlim_cur and rlim_max atomically, and either one 654 * alone is a single word that can safely be read normally. 655 * getrlimit/setrlimit use task_lock(current->group_leader) to 656 * protect this instead of the siglock, because they really 657 * have no need to disable irqs. 658 */ 659 struct rlimit rlim[RLIM_NLIMITS]; 660 661#ifdef CONFIG_BSD_PROCESS_ACCT 662 struct pacct_struct pacct; /* per-process accounting information */ 663#endif 664#ifdef CONFIG_TASKSTATS 665 struct taskstats *stats; 666#endif 667#ifdef CONFIG_AUDIT 668 unsigned audit_tty; 669 struct tty_audit_buf *tty_audit_buf; 670#endif 671 672 int oom_adj; /* OOM kill score adjustment (bit shift) */ 673}; 674 675/* Context switch must be unlocked if interrupts are to be enabled */ 676#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 677# define __ARCH_WANT_UNLOCKED_CTXSW 678#endif 679 680/* 681 * Bits in flags field of signal_struct. 682 */ 683#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 684#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 685#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 686#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 687/* 688 * Pending notifications to parent. 689 */ 690#define SIGNAL_CLD_STOPPED 0x00000010 691#define SIGNAL_CLD_CONTINUED 0x00000020 692#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) 693 694#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ 695 696/* If true, all threads except ->group_exit_task have pending SIGKILL */ 697static inline int signal_group_exit(const struct signal_struct *sig) 698{ 699 return (sig->flags & SIGNAL_GROUP_EXIT) || 700 (sig->group_exit_task != NULL); 701} 702 703/* 704 * Some day this will be a full-fledged user tracking system.. 705 */ 706struct user_struct { 707 atomic_t __count; /* reference count */ 708 atomic_t processes; /* How many processes does this user have? */ 709 atomic_t files; /* How many open files does this user have? */ 710 atomic_t sigpending; /* How many pending signals does this user have? */ 711#ifdef CONFIG_INOTIFY_USER 712 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 713 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 714#endif 715#ifdef CONFIG_EPOLL 716 atomic_t epoll_watches; /* The number of file descriptors currently watched */ 717#endif 718#ifdef CONFIG_POSIX_MQUEUE 719 /* protected by mq_lock */ 720 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 721#endif 722 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 723 724#ifdef CONFIG_KEYS 725 struct key *uid_keyring; /* UID specific keyring */ 726 struct key *session_keyring; /* UID's default session keyring */ 727#endif 728 729 /* Hash table maintenance information */ 730 struct hlist_node uidhash_node; 731 uid_t uid; 732 struct user_namespace *user_ns; 733 734#ifdef CONFIG_USER_SCHED 735 struct task_group *tg; 736#ifdef CONFIG_SYSFS 737 struct kobject kobj; 738 struct delayed_work work; 739#endif 740#endif 741 742#ifdef CONFIG_PERF_EVENTS 743 atomic_long_t locked_vm; 744#endif 745}; 746 747extern int uids_sysfs_init(void); 748 749extern struct user_struct *find_user(uid_t); 750 751extern struct user_struct root_user; 752#define INIT_USER (&root_user) 753 754 755struct backing_dev_info; 756struct reclaim_state; 757 758#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 759struct sched_info { 760 /* cumulative counters */ 761 unsigned long pcount; /* # of times run on this cpu */ 762 unsigned long long run_delay; /* time spent waiting on a runqueue */ 763 764 /* timestamps */ 765 unsigned long long last_arrival,/* when we last ran on a cpu */ 766 last_queued; /* when we were last queued to run */ 767#ifdef CONFIG_SCHEDSTATS 768 /* BKL stats */ 769 unsigned int bkl_count; 770#endif 771}; 772#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 773 774#ifdef CONFIG_TASK_DELAY_ACCT 775struct task_delay_info { 776 spinlock_t lock; 777 unsigned int flags; /* Private per-task flags */ 778 779 /* For each stat XXX, add following, aligned appropriately 780 * 781 * struct timespec XXX_start, XXX_end; 782 * u64 XXX_delay; 783 * u32 XXX_count; 784 * 785 * Atomicity of updates to XXX_delay, XXX_count protected by 786 * single lock above (split into XXX_lock if contention is an issue). 787 */ 788 789 /* 790 * XXX_count is incremented on every XXX operation, the delay 791 * associated with the operation is added to XXX_delay. 792 * XXX_delay contains the accumulated delay time in nanoseconds. 793 */ 794 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 795 u64 blkio_delay; /* wait for sync block io completion */ 796 u64 swapin_delay; /* wait for swapin block io completion */ 797 u32 blkio_count; /* total count of the number of sync block */ 798 /* io operations performed */ 799 u32 swapin_count; /* total count of the number of swapin block */ 800 /* io operations performed */ 801 802 struct timespec freepages_start, freepages_end; 803 u64 freepages_delay; /* wait for memory reclaim */ 804 u32 freepages_count; /* total count of memory reclaim */ 805}; 806#endif /* CONFIG_TASK_DELAY_ACCT */ 807 808static inline int sched_info_on(void) 809{ 810#ifdef CONFIG_SCHEDSTATS 811 return 1; 812#elif defined(CONFIG_TASK_DELAY_ACCT) 813 extern int delayacct_on; 814 return delayacct_on; 815#else 816 return 0; 817#endif 818} 819 820enum cpu_idle_type { 821 CPU_IDLE, 822 CPU_NOT_IDLE, 823 CPU_NEWLY_IDLE, 824 CPU_MAX_IDLE_TYPES 825}; 826 827/* 828 * sched-domains (multiprocessor balancing) declarations: 829 */ 830 831/* 832 * Increase resolution of nice-level calculations: 833 */ 834#define SCHED_LOAD_SHIFT 10 835#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 836 837#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE 838 839#ifdef CONFIG_SMP 840#define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ 841#define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ 842#define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ 843#define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ 844#define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ 845#define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ 846#define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */ 847#define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ 848#define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */ 849#define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ 850#define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ 851 852#define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ 853 854enum powersavings_balance_level { 855 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ 856 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package 857 * first for long running threads 858 */ 859 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle 860 * cpu package for power savings 861 */ 862 MAX_POWERSAVINGS_BALANCE_LEVELS 863}; 864 865extern int sched_mc_power_savings, sched_smt_power_savings; 866 867static inline int sd_balance_for_mc_power(void) 868{ 869 if (sched_smt_power_savings) 870 return SD_POWERSAVINGS_BALANCE; 871 872 return SD_PREFER_SIBLING; 873} 874 875static inline int sd_balance_for_package_power(void) 876{ 877 if (sched_mc_power_savings | sched_smt_power_savings) 878 return SD_POWERSAVINGS_BALANCE; 879 880 return SD_PREFER_SIBLING; 881} 882 883/* 884 * Optimise SD flags for power savings: 885 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings. 886 * Keep default SD flags if sched_{smt,mc}_power_saving=0 887 */ 888 889static inline int sd_power_saving_flags(void) 890{ 891 if (sched_mc_power_savings | sched_smt_power_savings) 892 return SD_BALANCE_NEWIDLE; 893 894 return 0; 895} 896 897struct sched_group { 898 struct sched_group *next; /* Must be a circular list */ 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; 905 906 /* 907 * The CPUs this group covers. 908 * 909 * NOTE: this field is variable length. (Allocated dynamically 910 * by attaching extra space to the end of the structure, 911 * depending on how many CPUs the kernel has booted up with) 912 * 913 * It is also be embedded into static data structures at build 914 * time. (See 'struct static_sched_group' in kernel/sched.c) 915 */ 916 unsigned long cpumask[0]; 917}; 918 919static inline struct cpumask *sched_group_cpus(struct sched_group *sg) 920{ 921 return to_cpumask(sg->cpumask); 922} 923 924enum sched_domain_level { 925 SD_LV_NONE = 0, 926 SD_LV_SIBLING, 927 SD_LV_MC, 928 SD_LV_CPU, 929 SD_LV_NODE, 930 SD_LV_ALLNODES, 931 SD_LV_MAX 932}; 933 934struct sched_domain_attr { 935 int relax_domain_level; 936}; 937 938#define SD_ATTR_INIT (struct sched_domain_attr) { \ 939 .relax_domain_level = -1, \ 940} 941 942struct sched_domain { 943 /* These fields must be setup */ 944 struct sched_domain *parent; /* top domain must be null terminated */ 945 struct sched_domain *child; /* bottom domain must be null terminated */ 946 struct sched_group *groups; /* the balancing groups of the domain */ 947 unsigned long min_interval; /* Minimum balance interval ms */ 948 unsigned long max_interval; /* Maximum balance interval ms */ 949 unsigned int busy_factor; /* less balancing by factor if busy */ 950 unsigned int imbalance_pct; /* No balance until over watermark */ 951 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 952 unsigned int busy_idx; 953 unsigned int idle_idx; 954 unsigned int newidle_idx; 955 unsigned int wake_idx; 956 unsigned int forkexec_idx; 957 unsigned int smt_gain; 958 int flags; /* See SD_* */ 959 enum sched_domain_level level; 960 961 /* Runtime fields. */ 962 unsigned long last_balance; /* init to jiffies. units in jiffies */ 963 unsigned int balance_interval; /* initialise to 1. units in ms. */ 964 unsigned int nr_balance_failed; /* initialise to 0 */ 965 966 u64 last_update; 967 968#ifdef CONFIG_SCHEDSTATS 969 /* load_balance() stats */ 970 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 971 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 972 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 973 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 974 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 975 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 976 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 977 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 978 979 /* Active load balancing */ 980 unsigned int alb_count; 981 unsigned int alb_failed; 982 unsigned int alb_pushed; 983 984 /* SD_BALANCE_EXEC stats */ 985 unsigned int sbe_count; 986 unsigned int sbe_balanced; 987 unsigned int sbe_pushed; 988 989 /* SD_BALANCE_FORK stats */ 990 unsigned int sbf_count; 991 unsigned int sbf_balanced; 992 unsigned int sbf_pushed; 993 994 /* try_to_wake_up() stats */ 995 unsigned int ttwu_wake_remote; 996 unsigned int ttwu_move_affine; 997 unsigned int ttwu_move_balance; 998#endif 999#ifdef CONFIG_SCHED_DEBUG 1000 char *name; 1001#endif 1002 1003 /* 1004 * Span of all CPUs in this domain. 1005 * 1006 * NOTE: this field is variable length. (Allocated dynamically 1007 * by attaching extra space to the end of the structure, 1008 * depending on how many CPUs the kernel has booted up with) 1009 * 1010 * It is also be embedded into static data structures at build 1011 * time. (See 'struct static_sched_domain' in kernel/sched.c) 1012 */ 1013 unsigned long span[0]; 1014}; 1015 1016static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 1017{ 1018 return to_cpumask(sd->span); 1019} 1020 1021extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 1022 struct sched_domain_attr *dattr_new); 1023 1024/* Allocate an array of sched domains, for partition_sched_domains(). */ 1025cpumask_var_t *alloc_sched_domains(unsigned int ndoms); 1026void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); 1027 1028/* Test a flag in parent sched domain */ 1029static inline int test_sd_parent(struct sched_domain *sd, int flag) 1030{ 1031 if (sd->parent && (sd->parent->flags & flag)) 1032 return 1; 1033 1034 return 0; 1035} 1036 1037unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); 1038unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); 1039 1040#else /* CONFIG_SMP */ 1041 1042struct sched_domain_attr; 1043 1044static inline void 1045partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 1046 struct sched_domain_attr *dattr_new) 1047{ 1048} 1049#endif /* !CONFIG_SMP */ 1050 1051 1052struct io_context; /* See blkdev.h */ 1053 1054 1055#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 1056extern void prefetch_stack(struct task_struct *t); 1057#else 1058static inline void prefetch_stack(struct task_struct *t) { } 1059#endif 1060 1061struct audit_context; /* See audit.c */ 1062struct mempolicy; 1063struct pipe_inode_info; 1064struct uts_namespace; 1065 1066struct rq; 1067struct sched_domain; 1068 1069/* 1070 * wake flags 1071 */ 1072#define WF_SYNC 0x01 /* waker goes to sleep after wakup */ 1073#define WF_FORK 0x02 /* child wakeup after fork */ 1074 1075struct sched_class { 1076 const struct sched_class *next; 1077 1078 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); 1079 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); 1080 void (*yield_task) (struct rq *rq); 1081 1082 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); 1083 1084 struct task_struct * (*pick_next_task) (struct rq *rq); 1085 void (*put_prev_task) (struct rq *rq, struct task_struct *p); 1086 1087#ifdef CONFIG_SMP 1088 int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags); 1089 1090 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, 1091 struct rq *busiest, unsigned long max_load_move, 1092 struct sched_domain *sd, enum cpu_idle_type idle, 1093 int *all_pinned, int *this_best_prio); 1094 1095 int (*move_one_task) (struct rq *this_rq, int this_cpu, 1096 struct rq *busiest, struct sched_domain *sd, 1097 enum cpu_idle_type idle); 1098 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); 1099 void (*post_schedule) (struct rq *this_rq); 1100 void (*task_waking) (struct rq *this_rq, struct task_struct *task); 1101 void (*task_woken) (struct rq *this_rq, struct task_struct *task); 1102 1103 void (*set_cpus_allowed)(struct task_struct *p, 1104 const struct cpumask *newmask); 1105 1106 void (*rq_online)(struct rq *rq); 1107 void (*rq_offline)(struct rq *rq); 1108#endif 1109 1110 void (*set_curr_task) (struct rq *rq); 1111 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 1112 void (*task_fork) (struct task_struct *p); 1113 1114 void (*switched_from) (struct rq *this_rq, struct task_struct *task, 1115 int running); 1116 void (*switched_to) (struct rq *this_rq, struct task_struct *task, 1117 int running); 1118 void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 1119 int oldprio, int running); 1120 1121 unsigned int (*get_rr_interval) (struct rq *rq, 1122 struct task_struct *task); 1123 1124#ifdef CONFIG_FAIR_GROUP_SCHED 1125 void (*moved_group) (struct task_struct *p, int on_rq); 1126#endif 1127}; 1128 1129struct load_weight { 1130 unsigned long weight, inv_weight; 1131}; 1132 1133/* 1134 * CFS stats for a schedulable entity (task, task-group etc) 1135 * 1136 * Current field usage histogram: 1137 * 1138 * 4 se->block_start 1139 * 4 se->run_node 1140 * 4 se->sleep_start 1141 * 6 se->load.weight 1142 */ 1143struct sched_entity { 1144 struct load_weight load; /* for load-balancing */ 1145 struct rb_node run_node; 1146 struct list_head group_node; 1147 unsigned int on_rq; 1148 1149 u64 exec_start; 1150 u64 sum_exec_runtime; 1151 u64 vruntime; 1152 u64 prev_sum_exec_runtime; 1153 1154 u64 last_wakeup; 1155 u64 avg_overlap; 1156 1157 u64 nr_migrations; 1158 1159 u64 start_runtime; 1160 u64 avg_wakeup; 1161 1162#ifdef CONFIG_SCHEDSTATS 1163 u64 wait_start; 1164 u64 wait_max; 1165 u64 wait_count; 1166 u64 wait_sum; 1167 u64 iowait_count; 1168 u64 iowait_sum; 1169 1170 u64 sleep_start; 1171 u64 sleep_max; 1172 s64 sum_sleep_runtime; 1173 1174 u64 block_start; 1175 u64 block_max; 1176 u64 exec_max; 1177 u64 slice_max; 1178 1179 u64 nr_migrations_cold; 1180 u64 nr_failed_migrations_affine; 1181 u64 nr_failed_migrations_running; 1182 u64 nr_failed_migrations_hot; 1183 u64 nr_forced_migrations; 1184 1185 u64 nr_wakeups; 1186 u64 nr_wakeups_sync; 1187 u64 nr_wakeups_migrate; 1188 u64 nr_wakeups_local; 1189 u64 nr_wakeups_remote; 1190 u64 nr_wakeups_affine; 1191 u64 nr_wakeups_affine_attempts; 1192 u64 nr_wakeups_passive; 1193 u64 nr_wakeups_idle; 1194#endif 1195 1196#ifdef CONFIG_FAIR_GROUP_SCHED 1197 struct sched_entity *parent; 1198 /* rq on which this entity is (to be) queued: */ 1199 struct cfs_rq *cfs_rq; 1200 /* rq "owned" by this entity/group: */ 1201 struct cfs_rq *my_q; 1202#endif 1203}; 1204 1205struct sched_rt_entity { 1206 struct list_head run_list; 1207 unsigned long timeout; 1208 unsigned int time_slice; 1209 int nr_cpus_allowed; 1210 1211 struct sched_rt_entity *back; 1212#ifdef CONFIG_RT_GROUP_SCHED 1213 struct sched_rt_entity *parent; 1214 /* rq on which this entity is (to be) queued: */ 1215 struct rt_rq *rt_rq; 1216 /* rq "owned" by this entity/group: */ 1217 struct rt_rq *my_q; 1218#endif 1219}; 1220 1221struct rcu_node; 1222 1223struct task_struct { 1224 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 1225 void *stack; 1226 atomic_t usage; 1227 unsigned int flags; /* per process flags, defined below */ 1228 unsigned int ptrace; 1229 1230 int lock_depth; /* BKL lock depth */ 1231 1232#ifdef CONFIG_SMP 1233#ifdef __ARCH_WANT_UNLOCKED_CTXSW 1234 int oncpu; 1235#endif 1236#endif 1237 1238 int prio, static_prio, normal_prio; 1239 unsigned int rt_priority; 1240 const struct sched_class *sched_class; 1241 struct sched_entity se; 1242 struct sched_rt_entity rt; 1243 1244#ifdef CONFIG_PREEMPT_NOTIFIERS 1245 /* list of struct preempt_notifier: */ 1246 struct hlist_head preempt_notifiers; 1247#endif 1248 1249 /* 1250 * fpu_counter contains the number of consecutive context switches 1251 * that the FPU is used. If this is over a threshold, the lazy fpu 1252 * saving becomes unlazy to save the trap. This is an unsigned char 1253 * so that after 256 times the counter wraps and the behavior turns 1254 * lazy again; this to deal with bursty apps that only use FPU for 1255 * a short time 1256 */ 1257 unsigned char fpu_counter; 1258#ifdef CONFIG_BLK_DEV_IO_TRACE 1259 unsigned int btrace_seq; 1260#endif 1261 1262 unsigned int policy; 1263 cpumask_t cpus_allowed; 1264 1265#ifdef CONFIG_TREE_PREEMPT_RCU 1266 int rcu_read_lock_nesting; 1267 char rcu_read_unlock_special; 1268 struct rcu_node *rcu_blocked_node; 1269 struct list_head rcu_node_entry; 1270#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ 1271 1272#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 1273 struct sched_info sched_info; 1274#endif 1275 1276 struct list_head tasks; 1277 struct plist_node pushable_tasks; 1278 1279 struct mm_struct *mm, *active_mm; 1280 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 /* ??? */ 1286 unsigned int personality; 1287 unsigned did_exec:1; 1288 unsigned in_execve:1; /* Tell the LSMs that the process is doing an 1289 * execve */ 1290 unsigned in_iowait:1; 1291 1292 1293 /* Revert to default priority/policy when forking */ 1294 unsigned sched_reset_on_fork:1; 1295 1296 pid_t pid; 1297 pid_t tgid; 1298 1299#ifdef CONFIG_CC_STACKPROTECTOR 1300 /* Canary value for the -fstack-protector gcc feature */ 1301 unsigned long stack_canary; 1302#endif 1303 1304 /* 1305 * pointers to (original) parent process, youngest child, younger sibling, 1306 * older sibling, respectively. (p->father can be replaced with 1307 * p->real_parent->pid) 1308 */ 1309 struct task_struct *real_parent; /* real parent process */ 1310 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ 1311 /* 1312 * children/sibling forms the list of my natural children 1313 */ 1314 struct list_head children; /* list of my children */ 1315 struct list_head sibling; /* linkage in my parent's children list */ 1316 struct task_struct *group_leader; /* threadgroup leader */ 1317 1318 /* 1319 * ptraced is the list of tasks this task is using ptrace on. 1320 * This includes both natural children and PTRACE_ATTACH targets. 1321 * p->ptrace_entry is p's link on the p->parent->ptraced list. 1322 */ 1323 struct list_head ptraced; 1324 struct list_head ptrace_entry; 1325 1326 /* 1327 * This is the tracer handle for the ptrace BTS extension. 1328 * This field actually belongs to the ptracer task. 1329 */ 1330 struct bts_context *bts; 1331 1332 /* PID/PID hash table linkage. */ 1333 struct pid_link pids[PIDTYPE_MAX]; 1334 struct list_head thread_group; 1335 1336 struct completion *vfork_done; /* for vfork() */ 1337 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1338 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1339 1340 cputime_t utime, stime, utimescaled, stimescaled; 1341 cputime_t gtime; 1342#ifndef CONFIG_VIRT_CPU_ACCOUNTING 1343 cputime_t prev_utime, prev_stime; 1344#endif 1345 unsigned long nvcsw, nivcsw; /* context switch counts */ 1346 struct timespec start_time; /* monotonic time */ 1347 struct timespec real_start_time; /* boot based time */ 1348/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1349 unsigned long min_flt, maj_flt; 1350 1351 struct task_cputime cputime_expires; 1352 struct list_head cpu_timers[3]; 1353 1354/* process credentials */ 1355 const struct cred *real_cred; /* objective and real subjective task 1356 * credentials (COW) */ 1357 const struct cred *cred; /* effective (overridable) subjective task 1358 * credentials (COW) */ 1359 struct mutex cred_guard_mutex; /* guard against foreign influences on 1360 * credential calculations 1361 * (notably. ptrace) */ 1362 struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */ 1363 1364 char comm[TASK_COMM_LEN]; /* executable name excluding path 1365 - access with [gs]et_task_comm (which lock 1366 it with task_lock()) 1367 - initialized normally by flush_old_exec */ 1368/* file system info */ 1369 int link_count, total_link_count; 1370#ifdef CONFIG_SYSVIPC 1371/* ipc stuff */ 1372 struct sysv_sem sysvsem; 1373#endif 1374#ifdef CONFIG_DETECT_HUNG_TASK 1375/* hung task detection */ 1376 unsigned long last_switch_count; 1377#endif 1378/* CPU-specific state of this task */ 1379 struct thread_struct thread; 1380/* filesystem information */ 1381 struct fs_struct *fs; 1382/* open file information */ 1383 struct files_struct *files; 1384/* namespaces */ 1385 struct nsproxy *nsproxy; 1386/* signal handlers */ 1387 struct signal_struct *signal; 1388 struct sighand_struct *sighand; 1389 1390 sigset_t blocked, real_blocked; 1391 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ 1392 struct sigpending pending; 1393 1394 unsigned long sas_ss_sp; 1395 size_t sas_ss_size; 1396 int (*notifier)(void *priv); 1397 void *notifier_data; 1398 sigset_t *notifier_mask; 1399 struct audit_context *audit_context; 1400#ifdef CONFIG_AUDITSYSCALL 1401 uid_t loginuid; 1402 unsigned int sessionid; 1403#endif 1404 seccomp_t seccomp; 1405 1406/* Thread group tracking */ 1407 u32 parent_exec_id; 1408 u32 self_exec_id; 1409/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, 1410 * mempolicy */ 1411 spinlock_t alloc_lock; 1412 1413#ifdef CONFIG_GENERIC_HARDIRQS 1414 /* IRQ handler threads */ 1415 struct irqaction *irqaction; 1416#endif 1417 1418 /* Protection of the PI data structures: */ 1419 raw_spinlock_t pi_lock; 1420 1421#ifdef CONFIG_RT_MUTEXES 1422 /* PI waiters blocked on a rt_mutex held by this task */ 1423 struct plist_head pi_waiters; 1424 /* Deadlock detection and priority inheritance handling */ 1425 struct rt_mutex_waiter *pi_blocked_on; 1426#endif 1427 1428#ifdef CONFIG_DEBUG_MUTEXES 1429 /* mutex deadlock detection */ 1430 struct mutex_waiter *blocked_on; 1431#endif 1432#ifdef CONFIG_TRACE_IRQFLAGS 1433 unsigned int irq_events; 1434 unsigned long hardirq_enable_ip; 1435 unsigned long hardirq_disable_ip; 1436 unsigned int hardirq_enable_event; 1437 unsigned int hardirq_disable_event; 1438 int hardirqs_enabled; 1439 int hardirq_context; 1440 unsigned long softirq_disable_ip; 1441 unsigned long softirq_enable_ip; 1442 unsigned int softirq_disable_event; 1443 unsigned int softirq_enable_event; 1444 int softirqs_enabled; 1445 int softirq_context; 1446#endif 1447#ifdef CONFIG_LOCKDEP 1448# define MAX_LOCK_DEPTH 48UL 1449 u64 curr_chain_key; 1450 int lockdep_depth; 1451 unsigned int lockdep_recursion; 1452 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1453 gfp_t lockdep_reclaim_gfp; 1454#endif 1455 1456#ifdef CONFIG_FS_JOURNAL_INFO 1457/* journalling filesystem info */ 1458 void *journal_info; 1459#endif 1460 1461/* stacked block device info */ 1462 struct bio *bio_list, **bio_tail; 1463 1464/* VM state */ 1465 struct reclaim_state *reclaim_state; 1466 1467 struct backing_dev_info *backing_dev_info; 1468 1469 struct io_context *io_context; 1470 1471 unsigned long ptrace_message; 1472 siginfo_t *last_siginfo; /* For ptrace use. */ 1473 struct task_io_accounting ioac; 1474#if defined(CONFIG_TASK_XACCT) 1475 u64 acct_rss_mem1; /* accumulated rss usage */ 1476 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1477 cputime_t acct_timexpd; /* stime + utime since last update */ 1478#endif 1479#ifdef CONFIG_CPUSETS 1480 nodemask_t mems_allowed; /* Protected by alloc_lock */ 1481 int cpuset_mem_spread_rotor; 1482#endif 1483#ifdef CONFIG_CGROUPS 1484 /* Control Group info protected by css_set_lock */ 1485 struct css_set *cgroups; 1486 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1487 struct list_head cg_list; 1488#endif 1489#ifdef CONFIG_FUTEX 1490 struct robust_list_head __user *robust_list; 1491#ifdef CONFIG_COMPAT 1492 struct compat_robust_list_head __user *compat_robust_list; 1493#endif 1494 struct list_head pi_state_list; 1495 struct futex_pi_state *pi_state_cache; 1496#endif 1497#ifdef CONFIG_PERF_EVENTS 1498 struct perf_event_context *perf_event_ctxp; 1499 struct mutex perf_event_mutex; 1500 struct list_head perf_event_list; 1501#endif 1502#ifdef CONFIG_NUMA 1503 struct mempolicy *mempolicy; /* Protected by alloc_lock */ 1504 short il_next; 1505#endif 1506 atomic_t fs_excl; /* holding fs exclusive resources */ 1507 struct rcu_head rcu; 1508 1509 /* 1510 * cache last used pipe for splice 1511 */ 1512 struct pipe_inode_info *splice_pipe; 1513#ifdef CONFIG_TASK_DELAY_ACCT 1514 struct task_delay_info *delays; 1515#endif 1516#ifdef CONFIG_FAULT_INJECTION 1517 int make_it_fail; 1518#endif 1519 struct prop_local_single dirties; 1520#ifdef CONFIG_LATENCYTOP 1521 int latency_record_count; 1522 struct latency_record latency_record[LT_SAVECOUNT]; 1523#endif 1524 /* 1525 * time slack values; these are used to round up poll() and 1526 * select() etc timeout values. These are in nanoseconds. 1527 */ 1528 unsigned long timer_slack_ns; 1529 unsigned long default_timer_slack_ns; 1530 1531 struct list_head *scm_work_list; 1532#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1533 /* Index of current stored adress in ret_stack */ 1534 int curr_ret_stack; 1535 /* Stack of return addresses for return function tracing */ 1536 struct ftrace_ret_stack *ret_stack; 1537 /* time stamp for last schedule */ 1538 unsigned long long ftrace_timestamp; 1539 /* 1540 * Number of functions that haven't been traced 1541 * because of depth overrun. 1542 */ 1543 atomic_t trace_overrun; 1544 /* Pause for the tracing */ 1545 atomic_t tracing_graph_pause; 1546#endif 1547#ifdef CONFIG_TRACING 1548 /* state flags for use by tracers */ 1549 unsigned long trace; 1550 /* bitmask of trace recursion */ 1551 unsigned long trace_recursion; 1552#endif /* CONFIG_TRACING */ 1553 unsigned long stack_start; 1554}; 1555 1556/* Future-safe accessor for struct task_struct's cpus_allowed. */ 1557#define tsk_cpumask(tsk) (&(tsk)->cpus_allowed) 1558 1559/* 1560 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1561 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1562 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1563 * values are inverted: lower p->prio value means higher priority. 1564 * 1565 * The MAX_USER_RT_PRIO value allows the actual maximum 1566 * RT priority to be separate from the value exported to 1567 * user-space. This allows kernel threads to set their 1568 * priority to a value higher than any user task. Note: 1569 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1570 */ 1571 1572#define MAX_USER_RT_PRIO 100 1573#define MAX_RT_PRIO MAX_USER_RT_PRIO 1574 1575#define MAX_PRIO (MAX_RT_PRIO + 40) 1576#define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1577 1578static inline int rt_prio(int prio) 1579{ 1580 if (unlikely(prio < MAX_RT_PRIO)) 1581 return 1; 1582 return 0; 1583} 1584 1585static inline int rt_task(struct task_struct *p) 1586{ 1587 return rt_prio(p->prio); 1588} 1589 1590static inline struct pid *task_pid(struct task_struct *task) 1591{ 1592 return task->pids[PIDTYPE_PID].pid; 1593} 1594 1595static inline struct pid *task_tgid(struct task_struct *task) 1596{ 1597 return task->group_leader->pids[PIDTYPE_PID].pid; 1598} 1599 1600/* 1601 * Without tasklist or rcu lock it is not safe to dereference 1602 * the result of task_pgrp/task_session even if task == current, 1603 * we can race with another thread doing sys_setsid/sys_setpgid. 1604 */ 1605static inline struct pid *task_pgrp(struct task_struct *task) 1606{ 1607 return task->group_leader->pids[PIDTYPE_PGID].pid; 1608} 1609 1610static inline struct pid *task_session(struct task_struct *task) 1611{ 1612 return task->group_leader->pids[PIDTYPE_SID].pid; 1613} 1614 1615struct pid_namespace; 1616 1617/* 1618 * the helpers to get the task's different pids as they are seen 1619 * from various namespaces 1620 * 1621 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1622 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 1623 * current. 1624 * task_xid_nr_ns() : id seen from the ns specified; 1625 * 1626 * set_task_vxid() : assigns a virtual id to a task; 1627 * 1628 * see also pid_nr() etc in include/linux/pid.h 1629 */ 1630pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, 1631 struct pid_namespace *ns); 1632 1633static inline pid_t task_pid_nr(struct task_struct *tsk) 1634{ 1635 return tsk->pid; 1636} 1637 1638static inline pid_t task_pid_nr_ns(struct task_struct *tsk, 1639 struct pid_namespace *ns) 1640{ 1641 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); 1642} 1643 1644static inline pid_t task_pid_vnr(struct task_struct *tsk) 1645{ 1646 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); 1647} 1648 1649 1650static inline pid_t task_tgid_nr(struct task_struct *tsk) 1651{ 1652 return tsk->tgid; 1653} 1654 1655pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1656 1657static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1658{ 1659 return pid_vnr(task_tgid(tsk)); 1660} 1661 1662 1663static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, 1664 struct pid_namespace *ns) 1665{ 1666 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); 1667} 1668 1669static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1670{ 1671 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); 1672} 1673 1674 1675static inline pid_t task_session_nr_ns(struct task_struct *tsk, 1676 struct pid_namespace *ns) 1677{ 1678 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); 1679} 1680 1681static inline pid_t task_session_vnr(struct task_struct *tsk) 1682{ 1683 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); 1684} 1685 1686/* obsolete, do not use */ 1687static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1688{ 1689 return task_pgrp_nr_ns(tsk, &init_pid_ns); 1690} 1691 1692/** 1693 * pid_alive - check that a task structure is not stale 1694 * @p: Task structure to be checked. 1695 * 1696 * Test if a process is not yet dead (at most zombie state) 1697 * If pid_alive fails, then pointers within the task structure 1698 * can be stale and must not be dereferenced. 1699 */ 1700static inline int pid_alive(struct task_struct *p) 1701{ 1702 return p->pids[PIDTYPE_PID].pid != NULL; 1703} 1704 1705/** 1706 * is_global_init - check if a task structure is init 1707 * @tsk: Task structure to be checked. 1708 * 1709 * Check if a task structure is the first user space task the kernel created. 1710 */ 1711static inline int is_global_init(struct task_struct *tsk) 1712{ 1713 return tsk->pid == 1; 1714} 1715 1716/* 1717 * is_container_init: 1718 * check whether in the task is init in its own pid namespace. 1719 */ 1720extern int is_container_init(struct task_struct *tsk); 1721 1722extern struct pid *cad_pid; 1723 1724extern void free_task(struct task_struct *tsk); 1725#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1726 1727extern void __put_task_struct(struct task_struct *t); 1728 1729static inline void put_task_struct(struct task_struct *t) 1730{ 1731 if (atomic_dec_and_test(&t->usage)) 1732 __put_task_struct(t); 1733} 1734 1735extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st); 1736extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st); 1737 1738/* 1739 * Per process flags 1740 */ 1741#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 1742 /* Not implemented yet, only for 486*/ 1743#define PF_STARTING 0x00000002 /* being created */ 1744#define PF_EXITING 0x00000004 /* getting shut down */ 1745#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1746#define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1747#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1748#define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ 1749#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1750#define PF_DUMPCORE 0x00000200 /* dumped core */ 1751#define PF_SIGNALED 0x00000400 /* killed by a signal */ 1752#define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1753#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 1754#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1755#define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */ 1756#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1757#define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1758#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1759#define PF_KSWAPD 0x00040000 /* I am kswapd */ 1760#define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */ 1761#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1762#define PF_KTHREAD 0x00200000 /* I am a kernel thread */ 1763#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1764#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1765#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1766#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1767#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ 1768#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ 1769#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1770#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1771#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1772#define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ 1773 1774/* 1775 * Only the _current_ task can read/write to tsk->flags, but other 1776 * tasks can access tsk->flags in readonly mode for example 1777 * with tsk_used_math (like during threaded core dumping). 1778 * There is however an exception to this rule during ptrace 1779 * or during fork: the ptracer task is allowed to write to the 1780 * child->flags of its traced child (same goes for fork, the parent 1781 * can write to the child->flags), because we're guaranteed the 1782 * child is not running and in turn not changing child->flags 1783 * at the same time the parent does it. 1784 */ 1785#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1786#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1787#define clear_used_math() clear_stopped_child_used_math(current) 1788#define set_used_math() set_stopped_child_used_math(current) 1789#define conditional_stopped_child_used_math(condition, child) \ 1790 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1791#define conditional_used_math(condition) \ 1792 conditional_stopped_child_used_math(condition, current) 1793#define copy_to_stopped_child_used_math(child) \ 1794 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1795/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1796#define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1797#define used_math() tsk_used_math(current) 1798 1799#ifdef CONFIG_TREE_PREEMPT_RCU 1800 1801#define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ 1802#define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ 1803 1804static inline void rcu_copy_process(struct task_struct *p) 1805{ 1806 p->rcu_read_lock_nesting = 0; 1807 p->rcu_read_unlock_special = 0; 1808 p->rcu_blocked_node = NULL; 1809 INIT_LIST_HEAD(&p->rcu_node_entry); 1810} 1811 1812#else 1813 1814static inline void rcu_copy_process(struct task_struct *p) 1815{ 1816} 1817 1818#endif 1819 1820#ifdef CONFIG_SMP 1821extern int set_cpus_allowed_ptr(struct task_struct *p, 1822 const struct cpumask *new_mask); 1823#else 1824static inline int set_cpus_allowed_ptr(struct task_struct *p, 1825 const struct cpumask *new_mask) 1826{ 1827 if (!cpumask_test_cpu(0, new_mask)) 1828 return -EINVAL; 1829 return 0; 1830} 1831#endif 1832 1833#ifndef CONFIG_CPUMASK_OFFSTACK 1834static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1835{ 1836 return set_cpus_allowed_ptr(p, &new_mask); 1837} 1838#endif 1839 1840/* 1841 * Architectures can set this to 1 if they have specified 1842 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, 1843 * but then during bootup it turns out that sched_clock() 1844 * is reliable after all: 1845 */ 1846#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1847extern int sched_clock_stable; 1848#endif 1849 1850/* ftrace calls sched_clock() directly */ 1851extern unsigned long long notrace sched_clock(void); 1852 1853extern void sched_clock_init(void); 1854extern u64 sched_clock_cpu(int cpu); 1855 1856#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1857static inline void sched_clock_tick(void) 1858{ 1859} 1860 1861static inline void sched_clock_idle_sleep_event(void) 1862{ 1863} 1864 1865static inline void sched_clock_idle_wakeup_event(u64 delta_ns) 1866{ 1867} 1868#else 1869extern void sched_clock_tick(void); 1870extern void sched_clock_idle_sleep_event(void); 1871extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1872#endif 1873 1874/* 1875 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1876 * clock constructed from sched_clock(): 1877 */ 1878extern unsigned long long cpu_clock(int cpu); 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 1900extern void sched_idle_next(void); 1901 1902#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) 1903extern void wake_up_idle_cpu(int cpu); 1904#else 1905static inline void wake_up_idle_cpu(int cpu) { } 1906#endif 1907 1908extern unsigned int sysctl_sched_latency; 1909extern unsigned int sysctl_sched_min_granularity; 1910extern unsigned int sysctl_sched_wakeup_granularity; 1911extern unsigned int sysctl_sched_shares_ratelimit; 1912extern unsigned int sysctl_sched_shares_thresh; 1913extern unsigned int sysctl_sched_child_runs_first; 1914 1915enum sched_tunable_scaling { 1916 SCHED_TUNABLESCALING_NONE, 1917 SCHED_TUNABLESCALING_LOG, 1918 SCHED_TUNABLESCALING_LINEAR, 1919 SCHED_TUNABLESCALING_END, 1920}; 1921extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; 1922 1923#ifdef CONFIG_SCHED_DEBUG 1924extern unsigned int sysctl_sched_migration_cost; 1925extern unsigned int sysctl_sched_nr_migrate; 1926extern unsigned int sysctl_sched_time_avg; 1927extern unsigned int sysctl_timer_migration; 1928 1929int sched_proc_update_handler(struct ctl_table *table, int write, 1930 void __user *buffer, size_t *length, 1931 loff_t *ppos); 1932#endif 1933#ifdef CONFIG_SCHED_DEBUG 1934static inline unsigned int get_sysctl_timer_migration(void) 1935{ 1936 return sysctl_timer_migration; 1937} 1938#else 1939static inline unsigned int get_sysctl_timer_migration(void) 1940{ 1941 return 1; 1942} 1943#endif 1944extern unsigned int sysctl_sched_rt_period; 1945extern int sysctl_sched_rt_runtime; 1946 1947int sched_rt_handler(struct ctl_table *table, int write, 1948 void __user *buffer, size_t *lenp, 1949 loff_t *ppos); 1950 1951extern unsigned int sysctl_sched_compat_yield; 1952 1953#ifdef CONFIG_RT_MUTEXES 1954extern int rt_mutex_getprio(struct task_struct *p); 1955extern void rt_mutex_setprio(struct task_struct *p, int prio); 1956extern void rt_mutex_adjust_pi(struct task_struct *p); 1957#else 1958static inline int rt_mutex_getprio(struct task_struct *p) 1959{ 1960 return p->normal_prio; 1961} 1962# define rt_mutex_adjust_pi(p) do { } while (0) 1963#endif 1964 1965extern void set_user_nice(struct task_struct *p, long nice); 1966extern int task_prio(const struct task_struct *p); 1967extern int task_nice(const struct task_struct *p); 1968extern int can_nice(const struct task_struct *p, const int nice); 1969extern int task_curr(const struct task_struct *p); 1970extern int idle_cpu(int cpu); 1971extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1972extern int sched_setscheduler_nocheck(struct task_struct *, int, 1973 struct sched_param *); 1974extern struct task_struct *idle_task(int cpu); 1975extern struct task_struct *curr_task(int cpu); 1976extern void set_curr_task(int cpu, struct task_struct *p); 1977 1978void yield(void); 1979 1980/* 1981 * The default (Linux) execution domain. 1982 */ 1983extern struct exec_domain default_exec_domain; 1984 1985union thread_union { 1986 struct thread_info thread_info; 1987 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1988}; 1989 1990#ifndef __HAVE_ARCH_KSTACK_END 1991static inline int kstack_end(void *addr) 1992{ 1993 /* Reliable end of stack detection: 1994 * Some APM bios versions misalign the stack 1995 */ 1996 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1997} 1998#endif 1999 2000extern union thread_union init_thread_union; 2001extern struct task_struct init_task; 2002 2003extern struct mm_struct init_mm; 2004 2005extern struct pid_namespace init_pid_ns; 2006 2007/* 2008 * find a task by one of its numerical ids 2009 * 2010 * find_task_by_pid_ns(): 2011 * finds a task by its pid in the specified namespace 2012 * find_task_by_vpid(): 2013 * finds a task by its virtual pid 2014 * 2015 * see also find_vpid() etc in include/linux/pid.h 2016 */ 2017 2018extern struct task_struct *find_task_by_vpid(pid_t nr); 2019extern struct task_struct *find_task_by_pid_ns(pid_t nr, 2020 struct pid_namespace *ns); 2021 2022extern void __set_special_pids(struct pid *pid); 2023 2024/* per-UID process charging. */ 2025extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 2026static inline struct user_struct *get_uid(struct user_struct *u) 2027{ 2028 atomic_inc(&u->__count); 2029 return u; 2030} 2031extern void free_uid(struct user_struct *); 2032extern void release_uids(struct user_namespace *ns); 2033 2034#include <asm/current.h> 2035 2036extern void do_timer(unsigned long ticks); 2037 2038extern int wake_up_state(struct task_struct *tsk, unsigned int state); 2039extern int wake_up_process(struct task_struct *tsk); 2040extern void wake_up_new_task(struct task_struct *tsk, 2041 unsigned long clone_flags); 2042#ifdef CONFIG_SMP 2043 extern void kick_process(struct task_struct *tsk); 2044#else 2045 static inline void kick_process(struct task_struct *tsk) { } 2046#endif 2047extern void sched_fork(struct task_struct *p, int clone_flags); 2048extern void sched_dead(struct task_struct *p); 2049 2050extern void proc_caches_init(void); 2051extern void flush_signals(struct task_struct *); 2052extern void __flush_signals(struct task_struct *); 2053extern void ignore_signals(struct task_struct *); 2054extern void flush_signal_handlers(struct task_struct *, int force_default); 2055extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 2056 2057static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 2058{ 2059 unsigned long flags; 2060 int ret; 2061 2062 spin_lock_irqsave(&tsk->sighand->siglock, flags); 2063 ret = dequeue_signal(tsk, mask, info); 2064 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 2065 2066 return ret; 2067} 2068 2069extern void block_all_signals(int (*notifier)(void *priv), void *priv, 2070 sigset_t *mask); 2071extern void unblock_all_signals(void); 2072extern void release_task(struct task_struct * p); 2073extern int send_sig_info(int, struct siginfo *, struct task_struct *); 2074extern int force_sigsegv(int, struct task_struct *); 2075extern int force_sig_info(int, struct siginfo *, struct task_struct *); 2076extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 2077extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 2078extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 2079extern int kill_pgrp(struct pid *pid, int sig, int priv); 2080extern int kill_pid(struct pid *pid, int sig, int priv); 2081extern int kill_proc_info(int, struct siginfo *, pid_t); 2082extern int do_notify_parent(struct task_struct *, int); 2083extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); 2084extern void force_sig(int, struct task_struct *); 2085extern void force_sig_specific(int, struct task_struct *); 2086extern int send_sig(int, struct task_struct *, int); 2087extern void zap_other_threads(struct task_struct *p); 2088extern struct sigqueue *sigqueue_alloc(void); 2089extern void sigqueue_free(struct sigqueue *); 2090extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); 2091extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 2092extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 2093 2094static inline int kill_cad_pid(int sig, int priv) 2095{ 2096 return kill_pid(cad_pid, sig, priv); 2097} 2098 2099/* These can be the second arg to send_sig_info/send_group_sig_info. */ 2100#define SEND_SIG_NOINFO ((struct siginfo *) 0) 2101#define SEND_SIG_PRIV ((struct siginfo *) 1) 2102#define SEND_SIG_FORCED ((struct siginfo *) 2) 2103 2104static inline int is_si_special(const struct siginfo *info) 2105{ 2106 return info <= SEND_SIG_FORCED; 2107} 2108 2109/* 2110 * True if we are on the alternate signal stack. 2111 */ 2112static inline int on_sig_stack(unsigned long sp) 2113{ 2114#ifdef CONFIG_STACK_GROWSUP 2115 return sp >= current->sas_ss_sp && 2116 sp - current->sas_ss_sp < current->sas_ss_size; 2117#else 2118 return sp > current->sas_ss_sp && 2119 sp - current->sas_ss_sp <= current->sas_ss_size; 2120#endif 2121} 2122 2123static inline int sas_ss_flags(unsigned long sp) 2124{ 2125 return (current->sas_ss_size == 0 ? SS_DISABLE 2126 : on_sig_stack(sp) ? SS_ONSTACK : 0); 2127} 2128 2129/* 2130 * Routines for handling mm_structs 2131 */ 2132extern struct mm_struct * mm_alloc(void); 2133 2134/* mmdrop drops the mm and the page tables */ 2135extern void __mmdrop(struct mm_struct *); 2136static inline void mmdrop(struct mm_struct * mm) 2137{ 2138 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 2139 __mmdrop(mm); 2140} 2141 2142/* mmput gets rid of the mappings and all user-space */ 2143extern void mmput(struct mm_struct *); 2144/* Grab a reference to a task's mm, if it is not already going away */ 2145extern struct mm_struct *get_task_mm(struct task_struct *task); 2146/* Remove the current tasks stale references to the old mm_struct */ 2147extern void mm_release(struct task_struct *, struct mm_struct *); 2148/* Allocate a new mm structure and copy contents from tsk->mm */ 2149extern struct mm_struct *dup_mm(struct task_struct *tsk); 2150 2151extern int copy_thread(unsigned long, unsigned long, unsigned long, 2152 struct task_struct *, struct pt_regs *); 2153extern void flush_thread(void); 2154extern void exit_thread(void); 2155 2156extern void exit_files(struct task_struct *); 2157extern void __cleanup_signal(struct signal_struct *); 2158extern void __cleanup_sighand(struct sighand_struct *); 2159 2160extern void exit_itimers(struct signal_struct *); 2161extern void flush_itimer_signals(void); 2162 2163extern NORET_TYPE void do_group_exit(int); 2164 2165extern void daemonize(const char *, ...); 2166extern int allow_signal(int); 2167extern int disallow_signal(int); 2168 2169extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 2170extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 2171struct task_struct *fork_idle(int); 2172 2173extern void set_task_comm(struct task_struct *tsk, char *from); 2174extern char *get_task_comm(char *to, struct task_struct *tsk); 2175 2176#ifdef CONFIG_SMP 2177extern void wait_task_context_switch(struct task_struct *p); 2178extern unsigned long wait_task_inactive(struct task_struct *, long match_state); 2179#else 2180static inline void wait_task_context_switch(struct task_struct *p) {} 2181static inline unsigned long wait_task_inactive(struct task_struct *p, 2182 long match_state) 2183{ 2184 return 1; 2185} 2186#endif 2187 2188#define next_task(p) \ 2189 list_entry_rcu((p)->tasks.next, struct task_struct, tasks) 2190 2191#define for_each_process(p) \ 2192 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 2193 2194extern bool current_is_single_threaded(void); 2195 2196/* 2197 * Careful: do_each_thread/while_each_thread is a double loop so 2198 * 'break' will not work as expected - use goto instead. 2199 */ 2200#define do_each_thread(g, t) \ 2201 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 2202 2203#define while_each_thread(g, t) \ 2204 while ((t = next_thread(t)) != g) 2205 2206/* de_thread depends on thread_group_leader not being a pid based check */ 2207#define thread_group_leader(p) (p == p->group_leader) 2208 2209/* Do to the insanities of de_thread it is possible for a process 2210 * to have the pid of the thread group leader without actually being 2211 * the thread group leader. For iteration through the pids in proc 2212 * all we care about is that we have a task with the appropriate 2213 * pid, we don't actually care if we have the right task. 2214 */ 2215static inline int has_group_leader_pid(struct task_struct *p) 2216{ 2217 return p->pid == p->tgid; 2218} 2219 2220static inline 2221int same_thread_group(struct task_struct *p1, struct task_struct *p2) 2222{ 2223 return p1->tgid == p2->tgid; 2224} 2225 2226static inline struct task_struct *next_thread(const struct task_struct *p) 2227{ 2228 return list_entry_rcu(p->thread_group.next, 2229 struct task_struct, thread_group); 2230} 2231 2232static inline int thread_group_empty(struct task_struct *p) 2233{ 2234 return list_empty(&p->thread_group); 2235} 2236 2237#define delay_group_leader(p) \ 2238 (thread_group_leader(p) && !thread_group_empty(p)) 2239 2240static inline int task_detached(struct task_struct *p) 2241{ 2242 return p->exit_signal == -1; 2243} 2244 2245/* 2246 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 2247 * subscriptions and synchronises with wait4(). Also used in procfs. Also 2248 * pins the final release of task.io_context. Also protects ->cpuset and 2249 * ->cgroup.subsys[]. 2250 * 2251 * Nests both inside and outside of read_lock(&tasklist_lock). 2252 * It must not be nested with write_lock_irq(&tasklist_lock), 2253 * neither inside nor outside. 2254 */ 2255static inline void task_lock(struct task_struct *p) 2256{ 2257 spin_lock(&p->alloc_lock); 2258} 2259 2260static inline void task_unlock(struct task_struct *p) 2261{ 2262 spin_unlock(&p->alloc_lock); 2263} 2264 2265extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 2266 unsigned long *flags); 2267 2268static inline void unlock_task_sighand(struct task_struct *tsk, 2269 unsigned long *flags) 2270{ 2271 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 2272} 2273 2274#ifndef __HAVE_THREAD_FUNCTIONS 2275 2276#define task_thread_info(task) ((struct thread_info *)(task)->stack) 2277#define task_stack_page(task) ((task)->stack) 2278 2279static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 2280{ 2281 *task_thread_info(p) = *task_thread_info(org); 2282 task_thread_info(p)->task = p; 2283} 2284 2285static inline unsigned long *end_of_stack(struct task_struct *p) 2286{ 2287 return (unsigned long *)(task_thread_info(p) + 1); 2288} 2289 2290#endif 2291 2292static inline int object_is_on_stack(void *obj) 2293{ 2294 void *stack = task_stack_page(current); 2295 2296 return (obj >= stack) && (obj < (stack + THREAD_SIZE)); 2297} 2298 2299extern void thread_info_cache_init(void); 2300 2301#ifdef CONFIG_DEBUG_STACK_USAGE 2302static inline unsigned long stack_not_used(struct task_struct *p) 2303{ 2304 unsigned long *n = end_of_stack(p); 2305 2306 do { /* Skip over canary */ 2307 n++; 2308 } while (!*n); 2309 2310 return (unsigned long)n - (unsigned long)end_of_stack(p); 2311} 2312#endif 2313 2314/* set thread flags in other task's structures 2315 * - see asm/thread_info.h for TIF_xxxx flags available 2316 */ 2317static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 2318{ 2319 set_ti_thread_flag(task_thread_info(tsk), flag); 2320} 2321 2322static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2323{ 2324 clear_ti_thread_flag(task_thread_info(tsk), flag); 2325} 2326 2327static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 2328{ 2329 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 2330} 2331 2332static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2333{ 2334 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 2335} 2336 2337static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 2338{ 2339 return test_ti_thread_flag(task_thread_info(tsk), flag); 2340} 2341 2342static inline void set_tsk_need_resched(struct task_struct *tsk) 2343{ 2344 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2345} 2346 2347static inline void clear_tsk_need_resched(struct task_struct *tsk) 2348{ 2349 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2350} 2351 2352static inline int test_tsk_need_resched(struct task_struct *tsk) 2353{ 2354 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); 2355} 2356 2357static inline int restart_syscall(void) 2358{ 2359 set_tsk_thread_flag(current, TIF_SIGPENDING); 2360 return -ERESTARTNOINTR; 2361} 2362 2363static inline int signal_pending(struct task_struct *p) 2364{ 2365 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 2366} 2367 2368static inline int __fatal_signal_pending(struct task_struct *p) 2369{ 2370 return unlikely(sigismember(&p->pending.signal, SIGKILL)); 2371} 2372 2373static inline int fatal_signal_pending(struct task_struct *p) 2374{ 2375 return signal_pending(p) && __fatal_signal_pending(p); 2376} 2377 2378static inline int signal_pending_state(long state, struct task_struct *p) 2379{ 2380 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) 2381 return 0; 2382 if (!signal_pending(p)) 2383 return 0; 2384 2385 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); 2386} 2387 2388static inline int need_resched(void) 2389{ 2390 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 2391} 2392 2393/* 2394 * cond_resched() and cond_resched_lock(): latency reduction via 2395 * explicit rescheduling in places that are safe. The return 2396 * value indicates whether a reschedule was done in fact. 2397 * cond_resched_lock() will drop the spinlock before scheduling, 2398 * cond_resched_softirq() will enable bhs before scheduling. 2399 */ 2400extern int _cond_resched(void); 2401 2402#define cond_resched() ({ \ 2403 __might_sleep(__FILE__, __LINE__, 0); \ 2404 _cond_resched(); \ 2405}) 2406 2407extern int __cond_resched_lock(spinlock_t *lock); 2408 2409#ifdef CONFIG_PREEMPT 2410#define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET 2411#else 2412#define PREEMPT_LOCK_OFFSET 0 2413#endif 2414 2415#define cond_resched_lock(lock) ({ \ 2416 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ 2417 __cond_resched_lock(lock); \ 2418}) 2419 2420extern int __cond_resched_softirq(void); 2421 2422#define cond_resched_softirq() ({ \ 2423 __might_sleep(__FILE__, __LINE__, SOFTIRQ_OFFSET); \ 2424 __cond_resched_softirq(); \ 2425}) 2426 2427/* 2428 * Does a critical section need to be broken due to another 2429 * task waiting?: (technically does not depend on CONFIG_PREEMPT, 2430 * but a general need for low latency) 2431 */ 2432static inline int spin_needbreak(spinlock_t *lock) 2433{ 2434#ifdef CONFIG_PREEMPT 2435 return spin_is_contended(lock); 2436#else 2437 return 0; 2438#endif 2439} 2440 2441/* 2442 * Thread group CPU time accounting. 2443 */ 2444void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); 2445void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); 2446 2447static inline void thread_group_cputime_init(struct signal_struct *sig) 2448{ 2449 sig->cputimer.cputime = INIT_CPUTIME; 2450 spin_lock_init(&sig->cputimer.lock); 2451 sig->cputimer.running = 0; 2452} 2453 2454static inline void thread_group_cputime_free(struct signal_struct *sig) 2455{ 2456} 2457 2458/* 2459 * Reevaluate whether the task has signals pending delivery. 2460 * Wake the task if so. 2461 * This is required every time the blocked sigset_t changes. 2462 * callers must hold sighand->siglock. 2463 */ 2464extern void recalc_sigpending_and_wake(struct task_struct *t); 2465extern void recalc_sigpending(void); 2466 2467extern void signal_wake_up(struct task_struct *t, int resume_stopped); 2468 2469/* 2470 * Wrappers for p->thread_info->cpu access. No-op on UP. 2471 */ 2472#ifdef CONFIG_SMP 2473 2474static inline unsigned int task_cpu(const struct task_struct *p) 2475{ 2476 return task_thread_info(p)->cpu; 2477} 2478 2479extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 2480 2481#else 2482 2483static inline unsigned int task_cpu(const struct task_struct *p) 2484{ 2485 return 0; 2486} 2487 2488static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 2489{ 2490} 2491 2492#endif /* CONFIG_SMP */ 2493 2494extern void arch_pick_mmap_layout(struct mm_struct *mm); 2495 2496#ifdef CONFIG_TRACING 2497extern void 2498__trace_special(void *__tr, void *__data, 2499 unsigned long arg1, unsigned long arg2, unsigned long arg3); 2500#else 2501static inline void 2502__trace_special(void *__tr, void *__data, 2503 unsigned long arg1, unsigned long arg2, unsigned long arg3) 2504{ 2505} 2506#endif 2507 2508extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); 2509extern long sched_getaffinity(pid_t pid, struct cpumask *mask); 2510 2511extern void normalize_rt_tasks(void); 2512 2513#ifdef CONFIG_GROUP_SCHED 2514 2515extern struct task_group init_task_group; 2516#ifdef CONFIG_USER_SCHED 2517extern struct task_group root_task_group; 2518extern void set_tg_uid(struct user_struct *user); 2519#endif 2520 2521extern struct task_group *sched_create_group(struct task_group *parent); 2522extern void sched_destroy_group(struct task_group *tg); 2523extern void sched_move_task(struct task_struct *tsk); 2524#ifdef CONFIG_FAIR_GROUP_SCHED 2525extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 2526extern unsigned long sched_group_shares(struct task_group *tg); 2527#endif 2528#ifdef CONFIG_RT_GROUP_SCHED 2529extern int sched_group_set_rt_runtime(struct task_group *tg, 2530 long rt_runtime_us); 2531extern long sched_group_rt_runtime(struct task_group *tg); 2532extern int sched_group_set_rt_period(struct task_group *tg, 2533 long rt_period_us); 2534extern long sched_group_rt_period(struct task_group *tg); 2535extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); 2536#endif 2537#endif 2538 2539extern int task_can_switch_user(struct user_struct *up, 2540 struct task_struct *tsk); 2541 2542#ifdef CONFIG_TASK_XACCT 2543static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2544{ 2545 tsk->ioac.rchar += amt; 2546} 2547 2548static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2549{ 2550 tsk->ioac.wchar += amt; 2551} 2552 2553static inline void inc_syscr(struct task_struct *tsk) 2554{ 2555 tsk->ioac.syscr++; 2556} 2557 2558static inline void inc_syscw(struct task_struct *tsk) 2559{ 2560 tsk->ioac.syscw++; 2561} 2562#else 2563static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2564{ 2565} 2566 2567static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2568{ 2569} 2570 2571static inline void inc_syscr(struct task_struct *tsk) 2572{ 2573} 2574 2575static inline void inc_syscw(struct task_struct *tsk) 2576{ 2577} 2578#endif 2579 2580#ifndef TASK_SIZE_OF 2581#define TASK_SIZE_OF(tsk) TASK_SIZE 2582#endif 2583 2584/* 2585 * Call the function if the target task is executing on a CPU right now: 2586 */ 2587extern void task_oncpu_function_call(struct task_struct *p, 2588 void (*func) (void *info), void *info); 2589 2590 2591#ifdef CONFIG_MM_OWNER 2592extern void mm_update_next_owner(struct mm_struct *mm); 2593extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); 2594#else 2595static inline void mm_update_next_owner(struct mm_struct *mm) 2596{ 2597} 2598 2599static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) 2600{ 2601} 2602#endif /* CONFIG_MM_OWNER */ 2603 2604#endif /* __KERNEL__ */ 2605 2606#endif 2607