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 46 struct 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 97 struct exec_domain; 98 struct futex_pi_state; 99 struct robust_list_head; 100 struct bio; 101 struct fs_struct; 102 struct bts_context; 103 struct perf_counter_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 */ 121 extern unsigned long avenrun[]; /* Load averages */ 122 extern 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; 135 136 extern unsigned long total_forks; 137 extern int nr_threads; 138 DECLARE_PER_CPU(unsigned long, process_counts); 139 extern int nr_processes(void); 140 extern unsigned long nr_running(void); 141 extern unsigned long nr_uninterruptible(void); 142 extern unsigned long nr_iowait(void); 143 extern void calc_global_load(void); 144 extern u64 cpu_nr_migrations(int cpu); 145 146 extern unsigned long get_parent_ip(unsigned long addr); 147 148 struct seq_file; 149 struct cfs_rq; 150 struct task_group; 151 #ifdef CONFIG_SCHED_DEBUG 152 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 153 extern void proc_sched_set_task(struct task_struct *p); 154 extern void 155 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 156 #else 157 static inline void 158 proc_sched_show_task(struct task_struct *p, struct seq_file *m) 159 { 160 } 161 static inline void proc_sched_set_task(struct task_struct *p) 162 { 163 } 164 static inline void 165 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 166 { 167 } 168 #endif 169 170 extern unsigned long long time_sync_thresh; 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 256 194 195 /* Convenience macros for the sake of set_task_state */ 196 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) 197 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) 198 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) 199 200 /* Convenience macros for the sake of wake_up */ 201 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 202 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) 203 204 /* get_task_state() */ 205 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ 206 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ 207 __TASK_TRACED) 208 209 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) 210 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) 211 #define task_is_stopped_or_traced(task) \ 212 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) 213 #define task_contributes_to_load(task) \ 214 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ 215 (task->flags & PF_FREEZING) == 0) 216 217 #define __set_task_state(tsk, state_value) \ 218 do { (tsk)->state = (state_value); } while (0) 219 #define set_task_state(tsk, state_value) \ 220 set_mb((tsk)->state, (state_value)) 221 222 /* 223 * set_current_state() includes a barrier so that the write of current->state 224 * is correctly serialised wrt the caller's subsequent test of whether to 225 * actually sleep: 226 * 227 * set_current_state(TASK_UNINTERRUPTIBLE); 228 * if (do_i_need_to_sleep()) 229 * schedule(); 230 * 231 * If the caller does not need such serialisation then use __set_current_state() 232 */ 233 #define __set_current_state(state_value) \ 234 do { current->state = (state_value); } while (0) 235 #define set_current_state(state_value) \ 236 set_mb(current->state, (state_value)) 237 238 /* Task command name length */ 239 #define TASK_COMM_LEN 16 240 241 #include <linux/spinlock.h> 242 243 /* 244 * This serializes "schedule()" and also protects 245 * the run-queue from deletions/modifications (but 246 * _adding_ to the beginning of the run-queue has 247 * a separate lock). 248 */ 249 extern rwlock_t tasklist_lock; 250 extern spinlock_t mmlist_lock; 251 252 struct task_struct; 253 254 extern void sched_init(void); 255 extern void sched_init_smp(void); 256 extern asmlinkage void schedule_tail(struct task_struct *prev); 257 extern void init_idle(struct task_struct *idle, int cpu); 258 extern void init_idle_bootup_task(struct task_struct *idle); 259 260 extern int runqueue_is_locked(void); 261 extern void task_rq_unlock_wait(struct task_struct *p); 262 263 extern cpumask_var_t nohz_cpu_mask; 264 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 265 extern int select_nohz_load_balancer(int cpu); 266 extern int get_nohz_load_balancer(void); 267 #else 268 static inline int select_nohz_load_balancer(int cpu) 269 { 270 return 0; 271 } 272 #endif 273 274 /* 275 * Only dump TASK_* tasks. (0 for all tasks) 276 */ 277 extern void show_state_filter(unsigned long state_filter); 278 279 static inline void show_state(void) 280 { 281 show_state_filter(0); 282 } 283 284 extern void show_regs(struct pt_regs *); 285 286 /* 287 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 288 * task), SP is the stack pointer of the first frame that should be shown in the back 289 * trace (or NULL if the entire call-chain of the task should be shown). 290 */ 291 extern void show_stack(struct task_struct *task, unsigned long *sp); 292 293 void io_schedule(void); 294 long io_schedule_timeout(long timeout); 295 296 extern void cpu_init (void); 297 extern void trap_init(void); 298 extern void update_process_times(int user); 299 extern void scheduler_tick(void); 300 301 extern void sched_show_task(struct task_struct *p); 302 303 #ifdef CONFIG_DETECT_SOFTLOCKUP 304 extern void softlockup_tick(void); 305 extern void touch_softlockup_watchdog(void); 306 extern void touch_all_softlockup_watchdogs(void); 307 extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write, 308 struct file *filp, void __user *buffer, 309 size_t *lenp, loff_t *ppos); 310 extern unsigned int softlockup_panic; 311 extern int softlockup_thresh; 312 #else 313 static inline void softlockup_tick(void) 314 { 315 } 316 static inline void touch_softlockup_watchdog(void) 317 { 318 } 319 static inline void touch_all_softlockup_watchdogs(void) 320 { 321 } 322 #endif 323 324 #ifdef CONFIG_DETECT_HUNG_TASK 325 extern unsigned int sysctl_hung_task_panic; 326 extern unsigned long sysctl_hung_task_check_count; 327 extern unsigned long sysctl_hung_task_timeout_secs; 328 extern unsigned long sysctl_hung_task_warnings; 329 extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, 330 struct file *filp, void __user *buffer, 331 size_t *lenp, loff_t *ppos); 332 #endif 333 334 /* Attach to any functions which should be ignored in wchan output. */ 335 #define __sched __attribute__((__section__(".sched.text"))) 336 337 /* Linker adds these: start and end of __sched functions */ 338 extern char __sched_text_start[], __sched_text_end[]; 339 340 /* Is this address in the __sched functions? */ 341 extern int in_sched_functions(unsigned long addr); 342 343 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 344 extern signed long schedule_timeout(signed long timeout); 345 extern signed long schedule_timeout_interruptible(signed long timeout); 346 extern signed long schedule_timeout_killable(signed long timeout); 347 extern signed long schedule_timeout_uninterruptible(signed long timeout); 348 asmlinkage void __schedule(void); 349 asmlinkage void schedule(void); 350 extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner); 351 352 struct nsproxy; 353 struct user_namespace; 354 355 /* 356 * Default maximum number of active map areas, this limits the number of vmas 357 * per mm struct. Users can overwrite this number by sysctl but there is a 358 * problem. 359 * 360 * When a program's coredump is generated as ELF format, a section is created 361 * per a vma. In ELF, the number of sections is represented in unsigned short. 362 * This means the number of sections should be smaller than 65535 at coredump. 363 * Because the kernel adds some informative sections to a image of program at 364 * generating coredump, we need some margin. The number of extra sections is 365 * 1-3 now and depends on arch. We use "5" as safe margin, here. 366 */ 367 #define MAPCOUNT_ELF_CORE_MARGIN (5) 368 #define DEFAULT_MAX_MAP_COUNT (USHORT_MAX - MAPCOUNT_ELF_CORE_MARGIN) 369 370 extern int sysctl_max_map_count; 371 372 #include <linux/aio.h> 373 374 extern unsigned long 375 arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 376 unsigned long, unsigned long); 377 extern unsigned long 378 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 379 unsigned long len, unsigned long pgoff, 380 unsigned long flags); 381 extern void arch_unmap_area(struct mm_struct *, unsigned long); 382 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 383 384 #if USE_SPLIT_PTLOCKS 385 /* 386 * The mm counters are not protected by its page_table_lock, 387 * so must be incremented atomically. 388 */ 389 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) 390 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) 391 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) 392 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) 393 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) 394 395 #else /* !USE_SPLIT_PTLOCKS */ 396 /* 397 * The mm counters are protected by its page_table_lock, 398 * so can be incremented directly. 399 */ 400 #define set_mm_counter(mm, member, value) (mm)->_##member = (value) 401 #define get_mm_counter(mm, member) ((mm)->_##member) 402 #define add_mm_counter(mm, member, value) (mm)->_##member += (value) 403 #define inc_mm_counter(mm, member) (mm)->_##member++ 404 #define dec_mm_counter(mm, member) (mm)->_##member-- 405 406 #endif /* !USE_SPLIT_PTLOCKS */ 407 408 #define get_mm_rss(mm) \ 409 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) 410 #define update_hiwater_rss(mm) do { \ 411 unsigned long _rss = get_mm_rss(mm); \ 412 if ((mm)->hiwater_rss < _rss) \ 413 (mm)->hiwater_rss = _rss; \ 414 } while (0) 415 #define update_hiwater_vm(mm) do { \ 416 if ((mm)->hiwater_vm < (mm)->total_vm) \ 417 (mm)->hiwater_vm = (mm)->total_vm; \ 418 } while (0) 419 420 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) 421 { 422 return max(mm->hiwater_rss, get_mm_rss(mm)); 423 } 424 425 static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) 426 { 427 return max(mm->hiwater_vm, mm->total_vm); 428 } 429 430 extern void set_dumpable(struct mm_struct *mm, int value); 431 extern int get_dumpable(struct mm_struct *mm); 432 433 /* mm flags */ 434 /* dumpable bits */ 435 #define MMF_DUMPABLE 0 /* core dump is permitted */ 436 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 437 #define MMF_DUMPABLE_BITS 2 438 439 /* coredump filter bits */ 440 #define MMF_DUMP_ANON_PRIVATE 2 441 #define MMF_DUMP_ANON_SHARED 3 442 #define MMF_DUMP_MAPPED_PRIVATE 4 443 #define MMF_DUMP_MAPPED_SHARED 5 444 #define MMF_DUMP_ELF_HEADERS 6 445 #define MMF_DUMP_HUGETLB_PRIVATE 7 446 #define MMF_DUMP_HUGETLB_SHARED 8 447 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 448 #define MMF_DUMP_FILTER_BITS 7 449 #define MMF_DUMP_FILTER_MASK \ 450 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 451 #define MMF_DUMP_FILTER_DEFAULT \ 452 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ 453 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) 454 455 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS 456 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) 457 #else 458 # define MMF_DUMP_MASK_DEFAULT_ELF 0 459 #endif 460 461 struct sighand_struct { 462 atomic_t count; 463 struct k_sigaction action[_NSIG]; 464 spinlock_t siglock; 465 wait_queue_head_t signalfd_wqh; 466 }; 467 468 struct pacct_struct { 469 int ac_flag; 470 long ac_exitcode; 471 unsigned long ac_mem; 472 cputime_t ac_utime, ac_stime; 473 unsigned long ac_minflt, ac_majflt; 474 }; 475 476 /** 477 * struct task_cputime - collected CPU time counts 478 * @utime: time spent in user mode, in &cputime_t units 479 * @stime: time spent in kernel mode, in &cputime_t units 480 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds 481 * 482 * This structure groups together three kinds of CPU time that are 483 * tracked for threads and thread groups. Most things considering 484 * CPU time want to group these counts together and treat all three 485 * of them in parallel. 486 */ 487 struct task_cputime { 488 cputime_t utime; 489 cputime_t stime; 490 unsigned long long sum_exec_runtime; 491 }; 492 /* Alternate field names when used to cache expirations. */ 493 #define prof_exp stime 494 #define virt_exp utime 495 #define sched_exp sum_exec_runtime 496 497 #define INIT_CPUTIME \ 498 (struct task_cputime) { \ 499 .utime = cputime_zero, \ 500 .stime = cputime_zero, \ 501 .sum_exec_runtime = 0, \ 502 } 503 504 /* 505 * Disable preemption until the scheduler is running. 506 * Reset by start_kernel()->sched_init()->init_idle(). 507 * 508 * We include PREEMPT_ACTIVE to avoid cond_resched() from working 509 * before the scheduler is active -- see should_resched(). 510 */ 511 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) 512 513 /** 514 * struct thread_group_cputimer - thread group interval timer counts 515 * @cputime: thread group interval timers. 516 * @running: non-zero when there are timers running and 517 * @cputime receives updates. 518 * @lock: lock for fields in this struct. 519 * 520 * This structure contains the version of task_cputime, above, that is 521 * used for thread group CPU timer calculations. 522 */ 523 struct thread_group_cputimer { 524 struct task_cputime cputime; 525 int running; 526 spinlock_t lock; 527 }; 528 529 /* 530 * NOTE! "signal_struct" does not have it's own 531 * locking, because a shared signal_struct always 532 * implies a shared sighand_struct, so locking 533 * sighand_struct is always a proper superset of 534 * the locking of signal_struct. 535 */ 536 struct signal_struct { 537 atomic_t count; 538 atomic_t live; 539 540 wait_queue_head_t wait_chldexit; /* for wait4() */ 541 542 /* current thread group signal load-balancing target: */ 543 struct task_struct *curr_target; 544 545 /* shared signal handling: */ 546 struct sigpending shared_pending; 547 548 /* thread group exit support */ 549 int group_exit_code; 550 /* overloaded: 551 * - notify group_exit_task when ->count is equal to notify_count 552 * - everyone except group_exit_task is stopped during signal delivery 553 * of fatal signals, group_exit_task processes the signal. 554 */ 555 int notify_count; 556 struct task_struct *group_exit_task; 557 558 /* thread group stop support, overloads group_exit_code too */ 559 int group_stop_count; 560 unsigned int flags; /* see SIGNAL_* flags below */ 561 562 /* POSIX.1b Interval Timers */ 563 struct list_head posix_timers; 564 565 /* ITIMER_REAL timer for the process */ 566 struct hrtimer real_timer; 567 struct pid *leader_pid; 568 ktime_t it_real_incr; 569 570 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 571 cputime_t it_prof_expires, it_virt_expires; 572 cputime_t it_prof_incr, it_virt_incr; 573 574 /* 575 * Thread group totals for process CPU timers. 576 * See thread_group_cputimer(), et al, for details. 577 */ 578 struct thread_group_cputimer cputimer; 579 580 /* Earliest-expiration cache. */ 581 struct task_cputime cputime_expires; 582 583 struct list_head cpu_timers[3]; 584 585 struct pid *tty_old_pgrp; 586 587 /* boolean value for session group leader */ 588 int leader; 589 590 struct tty_struct *tty; /* NULL if no tty */ 591 592 /* 593 * Cumulative resource counters for dead threads in the group, 594 * and for reaped dead child processes forked by this group. 595 * Live threads maintain their own counters and add to these 596 * in __exit_signal, except for the group leader. 597 */ 598 cputime_t utime, stime, cutime, cstime; 599 cputime_t gtime; 600 cputime_t cgtime; 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 struct task_io_accounting ioac; 605 606 /* 607 * Cumulative ns of schedule CPU time fo dead threads in the 608 * group, not including a zombie group leader, (This only differs 609 * from jiffies_to_ns(utime + stime) if sched_clock uses something 610 * other than jiffies.) 611 */ 612 unsigned long long sum_sched_runtime; 613 614 /* 615 * We don't bother to synchronize most readers of this at all, 616 * because there is no reader checking a limit that actually needs 617 * to get both rlim_cur and rlim_max atomically, and either one 618 * alone is a single word that can safely be read normally. 619 * getrlimit/setrlimit use task_lock(current->group_leader) to 620 * protect this instead of the siglock, because they really 621 * have no need to disable irqs. 622 */ 623 struct rlimit rlim[RLIM_NLIMITS]; 624 625 #ifdef CONFIG_BSD_PROCESS_ACCT 626 struct pacct_struct pacct; /* per-process accounting information */ 627 #endif 628 #ifdef CONFIG_TASKSTATS 629 struct taskstats *stats; 630 #endif 631 #ifdef CONFIG_AUDIT 632 unsigned audit_tty; 633 struct tty_audit_buf *tty_audit_buf; 634 #endif 635 }; 636 637 /* Context switch must be unlocked if interrupts are to be enabled */ 638 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 639 # define __ARCH_WANT_UNLOCKED_CTXSW 640 #endif 641 642 /* 643 * Bits in flags field of signal_struct. 644 */ 645 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 646 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 647 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 648 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 649 /* 650 * Pending notifications to parent. 651 */ 652 #define SIGNAL_CLD_STOPPED 0x00000010 653 #define SIGNAL_CLD_CONTINUED 0x00000020 654 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) 655 656 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ 657 658 /* If true, all threads except ->group_exit_task have pending SIGKILL */ 659 static inline int signal_group_exit(const struct signal_struct *sig) 660 { 661 return (sig->flags & SIGNAL_GROUP_EXIT) || 662 (sig->group_exit_task != NULL); 663 } 664 665 /* 666 * Some day this will be a full-fledged user tracking system.. 667 */ 668 struct user_struct { 669 atomic_t __count; /* reference count */ 670 atomic_t processes; /* How many processes does this user have? */ 671 atomic_t files; /* How many open files does this user have? */ 672 atomic_t sigpending; /* How many pending signals does this user have? */ 673 #ifdef CONFIG_INOTIFY_USER 674 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 675 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 676 #endif 677 #ifdef CONFIG_EPOLL 678 atomic_t epoll_watches; /* The number of file descriptors currently watched */ 679 #endif 680 #ifdef CONFIG_POSIX_MQUEUE 681 /* protected by mq_lock */ 682 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 683 #endif 684 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 685 686 #ifdef CONFIG_KEYS 687 struct key *uid_keyring; /* UID specific keyring */ 688 struct key *session_keyring; /* UID's default session keyring */ 689 #endif 690 691 /* Hash table maintenance information */ 692 struct hlist_node uidhash_node; 693 uid_t uid; 694 struct user_namespace *user_ns; 695 696 #ifdef CONFIG_USER_SCHED 697 struct task_group *tg; 698 #ifdef CONFIG_SYSFS 699 struct kobject kobj; 700 struct delayed_work work; 701 #endif 702 #endif 703 704 #ifdef CONFIG_PERF_COUNTERS 705 atomic_long_t locked_vm; 706 #endif 707 }; 708 709 extern int uids_sysfs_init(void); 710 711 extern struct user_struct *find_user(uid_t); 712 713 extern struct user_struct root_user; 714 #define INIT_USER (&root_user) 715 716 717 struct backing_dev_info; 718 struct reclaim_state; 719 720 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 721 struct sched_info { 722 /* cumulative counters */ 723 unsigned long pcount; /* # of times run on this cpu */ 724 unsigned long long run_delay; /* time spent waiting on a runqueue */ 725 726 /* timestamps */ 727 unsigned long long last_arrival,/* when we last ran on a cpu */ 728 last_queued; /* when we were last queued to run */ 729 #ifdef CONFIG_SCHEDSTATS 730 /* BKL stats */ 731 unsigned int bkl_count; 732 #endif 733 }; 734 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 735 736 #ifdef CONFIG_TASK_DELAY_ACCT 737 struct task_delay_info { 738 spinlock_t lock; 739 unsigned int flags; /* Private per-task flags */ 740 741 /* For each stat XXX, add following, aligned appropriately 742 * 743 * struct timespec XXX_start, XXX_end; 744 * u64 XXX_delay; 745 * u32 XXX_count; 746 * 747 * Atomicity of updates to XXX_delay, XXX_count protected by 748 * single lock above (split into XXX_lock if contention is an issue). 749 */ 750 751 /* 752 * XXX_count is incremented on every XXX operation, the delay 753 * associated with the operation is added to XXX_delay. 754 * XXX_delay contains the accumulated delay time in nanoseconds. 755 */ 756 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 757 u64 blkio_delay; /* wait for sync block io completion */ 758 u64 swapin_delay; /* wait for swapin block io completion */ 759 u32 blkio_count; /* total count of the number of sync block */ 760 /* io operations performed */ 761 u32 swapin_count; /* total count of the number of swapin block */ 762 /* io operations performed */ 763 764 struct timespec freepages_start, freepages_end; 765 u64 freepages_delay; /* wait for memory reclaim */ 766 u32 freepages_count; /* total count of memory reclaim */ 767 }; 768 #endif /* CONFIG_TASK_DELAY_ACCT */ 769 770 static inline int sched_info_on(void) 771 { 772 #ifdef CONFIG_SCHEDSTATS 773 return 1; 774 #elif defined(CONFIG_TASK_DELAY_ACCT) 775 extern int delayacct_on; 776 return delayacct_on; 777 #else 778 return 0; 779 #endif 780 } 781 782 enum cpu_idle_type { 783 CPU_IDLE, 784 CPU_NOT_IDLE, 785 CPU_NEWLY_IDLE, 786 CPU_MAX_IDLE_TYPES 787 }; 788 789 /* 790 * sched-domains (multiprocessor balancing) declarations: 791 */ 792 793 /* 794 * Increase resolution of nice-level calculations: 795 */ 796 #define SCHED_LOAD_SHIFT 10 797 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 798 799 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE 800 801 #ifdef CONFIG_SMP 802 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ 803 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ 804 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ 805 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ 806 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ 807 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ 808 #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */ 809 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ 810 #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */ 811 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ 812 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ 813 814 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ 815 816 enum powersavings_balance_level { 817 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ 818 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package 819 * first for long running threads 820 */ 821 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle 822 * cpu package for power savings 823 */ 824 MAX_POWERSAVINGS_BALANCE_LEVELS 825 }; 826 827 extern int sched_mc_power_savings, sched_smt_power_savings; 828 829 static inline int sd_balance_for_mc_power(void) 830 { 831 if (sched_smt_power_savings) 832 return SD_POWERSAVINGS_BALANCE; 833 834 return SD_PREFER_SIBLING; 835 } 836 837 static inline int sd_balance_for_package_power(void) 838 { 839 if (sched_mc_power_savings | sched_smt_power_savings) 840 return SD_POWERSAVINGS_BALANCE; 841 842 return SD_PREFER_SIBLING; 843 } 844 845 /* 846 * Optimise SD flags for power savings: 847 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings. 848 * Keep default SD flags if sched_{smt,mc}_power_saving=0 849 */ 850 851 static inline int sd_power_saving_flags(void) 852 { 853 if (sched_mc_power_savings | sched_smt_power_savings) 854 return SD_BALANCE_NEWIDLE; 855 856 return 0; 857 } 858 859 struct sched_group { 860 struct sched_group *next; /* Must be a circular list */ 861 862 /* 863 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 864 * single CPU. 865 */ 866 unsigned int cpu_power; 867 868 /* 869 * The CPUs this group covers. 870 * 871 * NOTE: this field is variable length. (Allocated dynamically 872 * by attaching extra space to the end of the structure, 873 * depending on how many CPUs the kernel has booted up with) 874 * 875 * It is also be embedded into static data structures at build 876 * time. (See 'struct static_sched_group' in kernel/sched.c) 877 */ 878 unsigned long cpumask[0]; 879 }; 880 881 static inline struct cpumask *sched_group_cpus(struct sched_group *sg) 882 { 883 return to_cpumask(sg->cpumask); 884 } 885 886 enum sched_domain_level { 887 SD_LV_NONE = 0, 888 SD_LV_SIBLING, 889 SD_LV_MC, 890 SD_LV_CPU, 891 SD_LV_NODE, 892 SD_LV_ALLNODES, 893 SD_LV_MAX 894 }; 895 896 struct sched_domain_attr { 897 int relax_domain_level; 898 }; 899 900 #define SD_ATTR_INIT (struct sched_domain_attr) { \ 901 .relax_domain_level = -1, \ 902 } 903 904 struct sched_domain { 905 /* These fields must be setup */ 906 struct sched_domain *parent; /* top domain must be null terminated */ 907 struct sched_domain *child; /* bottom domain must be null terminated */ 908 struct sched_group *groups; /* the balancing groups of the domain */ 909 unsigned long min_interval; /* Minimum balance interval ms */ 910 unsigned long max_interval; /* Maximum balance interval ms */ 911 unsigned int busy_factor; /* less balancing by factor if busy */ 912 unsigned int imbalance_pct; /* No balance until over watermark */ 913 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 914 unsigned int busy_idx; 915 unsigned int idle_idx; 916 unsigned int newidle_idx; 917 unsigned int wake_idx; 918 unsigned int forkexec_idx; 919 unsigned int smt_gain; 920 int flags; /* See SD_* */ 921 enum sched_domain_level level; 922 923 /* Runtime fields. */ 924 unsigned long last_balance; /* init to jiffies. units in jiffies */ 925 unsigned int balance_interval; /* initialise to 1. units in ms. */ 926 unsigned int nr_balance_failed; /* initialise to 0 */ 927 928 u64 last_update; 929 930 #ifdef CONFIG_SCHEDSTATS 931 /* load_balance() stats */ 932 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 933 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 934 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 935 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 936 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 937 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 938 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 939 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 940 941 /* Active load balancing */ 942 unsigned int alb_count; 943 unsigned int alb_failed; 944 unsigned int alb_pushed; 945 946 /* SD_BALANCE_EXEC stats */ 947 unsigned int sbe_count; 948 unsigned int sbe_balanced; 949 unsigned int sbe_pushed; 950 951 /* SD_BALANCE_FORK stats */ 952 unsigned int sbf_count; 953 unsigned int sbf_balanced; 954 unsigned int sbf_pushed; 955 956 /* try_to_wake_up() stats */ 957 unsigned int ttwu_wake_remote; 958 unsigned int ttwu_move_affine; 959 unsigned int ttwu_move_balance; 960 #endif 961 #ifdef CONFIG_SCHED_DEBUG 962 char *name; 963 #endif 964 965 /* 966 * Span of all CPUs in this domain. 967 * 968 * NOTE: this field is variable length. (Allocated dynamically 969 * by attaching extra space to the end of the structure, 970 * depending on how many CPUs the kernel has booted up with) 971 * 972 * It is also be embedded into static data structures at build 973 * time. (See 'struct static_sched_domain' in kernel/sched.c) 974 */ 975 unsigned long span[0]; 976 }; 977 978 static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 979 { 980 return to_cpumask(sd->span); 981 } 982 983 extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new, 984 struct sched_domain_attr *dattr_new); 985 986 /* Test a flag in parent sched domain */ 987 static inline int test_sd_parent(struct sched_domain *sd, int flag) 988 { 989 if (sd->parent && (sd->parent->flags & flag)) 990 return 1; 991 992 return 0; 993 } 994 995 unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); 996 unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); 997 998 #else /* CONFIG_SMP */ 999 1000 struct sched_domain_attr; 1001 1002 static inline void 1003 partition_sched_domains(int ndoms_new, struct cpumask *doms_new, 1004 struct sched_domain_attr *dattr_new) 1005 { 1006 } 1007 #endif /* !CONFIG_SMP */ 1008 1009 1010 struct io_context; /* See blkdev.h */ 1011 1012 1013 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 1014 extern void prefetch_stack(struct task_struct *t); 1015 #else 1016 static inline void prefetch_stack(struct task_struct *t) { } 1017 #endif 1018 1019 struct audit_context; /* See audit.c */ 1020 struct mempolicy; 1021 struct pipe_inode_info; 1022 struct uts_namespace; 1023 1024 struct rq; 1025 struct sched_domain; 1026 1027 /* 1028 * wake flags 1029 */ 1030 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */ 1031 #define WF_FORK 0x02 /* child wakeup after fork */ 1032 1033 struct sched_class { 1034 const struct sched_class *next; 1035 1036 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); 1037 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); 1038 void (*yield_task) (struct rq *rq); 1039 1040 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); 1041 1042 struct task_struct * (*pick_next_task) (struct rq *rq); 1043 void (*put_prev_task) (struct rq *rq, struct task_struct *p); 1044 1045 #ifdef CONFIG_SMP 1046 int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags); 1047 1048 unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, 1049 struct rq *busiest, unsigned long max_load_move, 1050 struct sched_domain *sd, enum cpu_idle_type idle, 1051 int *all_pinned, int *this_best_prio); 1052 1053 int (*move_one_task) (struct rq *this_rq, int this_cpu, 1054 struct rq *busiest, struct sched_domain *sd, 1055 enum cpu_idle_type idle); 1056 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); 1057 void (*post_schedule) (struct rq *this_rq); 1058 void (*task_wake_up) (struct rq *this_rq, struct task_struct *task); 1059 1060 void (*set_cpus_allowed)(struct task_struct *p, 1061 const struct cpumask *newmask); 1062 1063 void (*rq_online)(struct rq *rq); 1064 void (*rq_offline)(struct rq *rq); 1065 #endif 1066 1067 void (*set_curr_task) (struct rq *rq); 1068 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 1069 void (*task_new) (struct rq *rq, struct task_struct *p); 1070 1071 void (*switched_from) (struct rq *this_rq, struct task_struct *task, 1072 int running); 1073 void (*switched_to) (struct rq *this_rq, struct task_struct *task, 1074 int running); 1075 void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 1076 int oldprio, int running); 1077 1078 #ifdef CONFIG_FAIR_GROUP_SCHED 1079 void (*moved_group) (struct task_struct *p); 1080 #endif 1081 }; 1082 1083 struct load_weight { 1084 unsigned long weight, inv_weight; 1085 }; 1086 1087 /* 1088 * CFS stats for a schedulable entity (task, task-group etc) 1089 * 1090 * Current field usage histogram: 1091 * 1092 * 4 se->block_start 1093 * 4 se->run_node 1094 * 4 se->sleep_start 1095 * 6 se->load.weight 1096 */ 1097 struct sched_entity { 1098 struct load_weight load; /* for load-balancing */ 1099 struct rb_node run_node; 1100 struct list_head group_node; 1101 unsigned int on_rq; 1102 1103 u64 exec_start; 1104 u64 sum_exec_runtime; 1105 u64 vruntime; 1106 u64 prev_sum_exec_runtime; 1107 1108 u64 last_wakeup; 1109 u64 avg_overlap; 1110 1111 u64 nr_migrations; 1112 1113 u64 start_runtime; 1114 u64 avg_wakeup; 1115 1116 u64 avg_running; 1117 1118 #ifdef CONFIG_SCHEDSTATS 1119 u64 wait_start; 1120 u64 wait_max; 1121 u64 wait_count; 1122 u64 wait_sum; 1123 u64 iowait_count; 1124 u64 iowait_sum; 1125 1126 u64 sleep_start; 1127 u64 sleep_max; 1128 s64 sum_sleep_runtime; 1129 1130 u64 block_start; 1131 u64 block_max; 1132 u64 exec_max; 1133 u64 slice_max; 1134 1135 u64 nr_migrations_cold; 1136 u64 nr_failed_migrations_affine; 1137 u64 nr_failed_migrations_running; 1138 u64 nr_failed_migrations_hot; 1139 u64 nr_forced_migrations; 1140 u64 nr_forced2_migrations; 1141 1142 u64 nr_wakeups; 1143 u64 nr_wakeups_sync; 1144 u64 nr_wakeups_migrate; 1145 u64 nr_wakeups_local; 1146 u64 nr_wakeups_remote; 1147 u64 nr_wakeups_affine; 1148 u64 nr_wakeups_affine_attempts; 1149 u64 nr_wakeups_passive; 1150 u64 nr_wakeups_idle; 1151 #endif 1152 1153 #ifdef CONFIG_FAIR_GROUP_SCHED 1154 struct sched_entity *parent; 1155 /* rq on which this entity is (to be) queued: */ 1156 struct cfs_rq *cfs_rq; 1157 /* rq "owned" by this entity/group: */ 1158 struct cfs_rq *my_q; 1159 #endif 1160 }; 1161 1162 struct sched_rt_entity { 1163 struct list_head run_list; 1164 unsigned long timeout; 1165 unsigned int time_slice; 1166 int nr_cpus_allowed; 1167 1168 struct sched_rt_entity *back; 1169 #ifdef CONFIG_RT_GROUP_SCHED 1170 struct sched_rt_entity *parent; 1171 /* rq on which this entity is (to be) queued: */ 1172 struct rt_rq *rt_rq; 1173 /* rq "owned" by this entity/group: */ 1174 struct rt_rq *my_q; 1175 #endif 1176 }; 1177 1178 struct rcu_node; 1179 1180 struct task_struct { 1181 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 1182 void *stack; 1183 atomic_t usage; 1184 unsigned int flags; /* per process flags, defined below */ 1185 unsigned int ptrace; 1186 1187 int lock_depth; /* BKL lock depth */ 1188 1189 #ifdef CONFIG_SMP 1190 #ifdef __ARCH_WANT_UNLOCKED_CTXSW 1191 int oncpu; 1192 #endif 1193 #endif 1194 1195 int prio, static_prio, normal_prio; 1196 unsigned int rt_priority; 1197 const struct sched_class *sched_class; 1198 struct sched_entity se; 1199 struct sched_rt_entity rt; 1200 1201 #ifdef CONFIG_PREEMPT_NOTIFIERS 1202 /* list of struct preempt_notifier: */ 1203 struct hlist_head preempt_notifiers; 1204 #endif 1205 1206 /* 1207 * fpu_counter contains the number of consecutive context switches 1208 * that the FPU is used. If this is over a threshold, the lazy fpu 1209 * saving becomes unlazy to save the trap. This is an unsigned char 1210 * so that after 256 times the counter wraps and the behavior turns 1211 * lazy again; this to deal with bursty apps that only use FPU for 1212 * a short time 1213 */ 1214 unsigned char fpu_counter; 1215 s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ 1216 #ifdef CONFIG_BLK_DEV_IO_TRACE 1217 unsigned int btrace_seq; 1218 #endif 1219 1220 unsigned int policy; 1221 cpumask_t cpus_allowed; 1222 1223 #ifdef CONFIG_TREE_PREEMPT_RCU 1224 int rcu_read_lock_nesting; 1225 char rcu_read_unlock_special; 1226 struct rcu_node *rcu_blocked_node; 1227 struct list_head rcu_node_entry; 1228 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ 1229 1230 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 1231 struct sched_info sched_info; 1232 #endif 1233 1234 struct list_head tasks; 1235 struct plist_node pushable_tasks; 1236 1237 struct mm_struct *mm, *active_mm; 1238 1239 /* task state */ 1240 struct linux_binfmt *binfmt; 1241 int exit_state; 1242 int exit_code, exit_signal; 1243 int pdeath_signal; /* The signal sent when the parent dies */ 1244 /* ??? */ 1245 unsigned int personality; 1246 unsigned did_exec:1; 1247 unsigned in_execve:1; /* Tell the LSMs that the process is doing an 1248 * execve */ 1249 unsigned in_iowait:1; 1250 1251 1252 /* Revert to default priority/policy when forking */ 1253 unsigned sched_reset_on_fork:1; 1254 1255 pid_t pid; 1256 pid_t tgid; 1257 1258 #ifdef CONFIG_CC_STACKPROTECTOR 1259 /* Canary value for the -fstack-protector gcc feature */ 1260 unsigned long stack_canary; 1261 #endif 1262 1263 /* 1264 * pointers to (original) parent process, youngest child, younger sibling, 1265 * older sibling, respectively. (p->father can be replaced with 1266 * p->real_parent->pid) 1267 */ 1268 struct task_struct *real_parent; /* real parent process */ 1269 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ 1270 /* 1271 * children/sibling forms the list of my natural children 1272 */ 1273 struct list_head children; /* list of my children */ 1274 struct list_head sibling; /* linkage in my parent's children list */ 1275 struct task_struct *group_leader; /* threadgroup leader */ 1276 1277 /* 1278 * ptraced is the list of tasks this task is using ptrace on. 1279 * This includes both natural children and PTRACE_ATTACH targets. 1280 * p->ptrace_entry is p's link on the p->parent->ptraced list. 1281 */ 1282 struct list_head ptraced; 1283 struct list_head ptrace_entry; 1284 1285 /* 1286 * This is the tracer handle for the ptrace BTS extension. 1287 * This field actually belongs to the ptracer task. 1288 */ 1289 struct bts_context *bts; 1290 1291 /* PID/PID hash table linkage. */ 1292 struct pid_link pids[PIDTYPE_MAX]; 1293 struct list_head thread_group; 1294 1295 struct completion *vfork_done; /* for vfork() */ 1296 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1297 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1298 1299 cputime_t utime, stime, utimescaled, stimescaled; 1300 cputime_t gtime; 1301 cputime_t prev_utime, prev_stime; 1302 unsigned long nvcsw, nivcsw; /* context switch counts */ 1303 struct timespec start_time; /* monotonic time */ 1304 struct timespec real_start_time; /* boot based time */ 1305 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1306 unsigned long min_flt, maj_flt; 1307 1308 struct task_cputime cputime_expires; 1309 struct list_head cpu_timers[3]; 1310 1311 /* process credentials */ 1312 const struct cred *real_cred; /* objective and real subjective task 1313 * credentials (COW) */ 1314 const struct cred *cred; /* effective (overridable) subjective task 1315 * credentials (COW) */ 1316 struct mutex cred_guard_mutex; /* guard against foreign influences on 1317 * credential calculations 1318 * (notably. ptrace) */ 1319 struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */ 1320 1321 char comm[TASK_COMM_LEN]; /* executable name excluding path 1322 - access with [gs]et_task_comm (which lock 1323 it with task_lock()) 1324 - initialized normally by flush_old_exec */ 1325 /* file system info */ 1326 int link_count, total_link_count; 1327 #ifdef CONFIG_SYSVIPC 1328 /* ipc stuff */ 1329 struct sysv_sem sysvsem; 1330 #endif 1331 #ifdef CONFIG_DETECT_HUNG_TASK 1332 /* hung task detection */ 1333 unsigned long last_switch_count; 1334 #endif 1335 /* CPU-specific state of this task */ 1336 struct thread_struct thread; 1337 /* filesystem information */ 1338 struct fs_struct *fs; 1339 /* open file information */ 1340 struct files_struct *files; 1341 /* namespaces */ 1342 struct nsproxy *nsproxy; 1343 /* signal handlers */ 1344 struct signal_struct *signal; 1345 struct sighand_struct *sighand; 1346 1347 sigset_t blocked, real_blocked; 1348 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ 1349 struct sigpending pending; 1350 1351 unsigned long sas_ss_sp; 1352 size_t sas_ss_size; 1353 int (*notifier)(void *priv); 1354 void *notifier_data; 1355 sigset_t *notifier_mask; 1356 struct audit_context *audit_context; 1357 #ifdef CONFIG_AUDITSYSCALL 1358 uid_t loginuid; 1359 unsigned int sessionid; 1360 #endif 1361 seccomp_t seccomp; 1362 1363 /* Thread group tracking */ 1364 u32 parent_exec_id; 1365 u32 self_exec_id; 1366 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, 1367 * mempolicy */ 1368 spinlock_t alloc_lock; 1369 1370 #ifdef CONFIG_GENERIC_HARDIRQS 1371 /* IRQ handler threads */ 1372 struct irqaction *irqaction; 1373 #endif 1374 1375 /* Protection of the PI data structures: */ 1376 spinlock_t pi_lock; 1377 1378 #ifdef CONFIG_RT_MUTEXES 1379 /* PI waiters blocked on a rt_mutex held by this task */ 1380 struct plist_head pi_waiters; 1381 /* Deadlock detection and priority inheritance handling */ 1382 struct rt_mutex_waiter *pi_blocked_on; 1383 #endif 1384 1385 #ifdef CONFIG_DEBUG_MUTEXES 1386 /* mutex deadlock detection */ 1387 struct mutex_waiter *blocked_on; 1388 #endif 1389 #ifdef CONFIG_TRACE_IRQFLAGS 1390 unsigned int irq_events; 1391 int hardirqs_enabled; 1392 unsigned long hardirq_enable_ip; 1393 unsigned int hardirq_enable_event; 1394 unsigned long hardirq_disable_ip; 1395 unsigned int hardirq_disable_event; 1396 int softirqs_enabled; 1397 unsigned long softirq_disable_ip; 1398 unsigned int softirq_disable_event; 1399 unsigned long softirq_enable_ip; 1400 unsigned int softirq_enable_event; 1401 int hardirq_context; 1402 int softirq_context; 1403 #endif 1404 #ifdef CONFIG_LOCKDEP 1405 # define MAX_LOCK_DEPTH 48UL 1406 u64 curr_chain_key; 1407 int lockdep_depth; 1408 unsigned int lockdep_recursion; 1409 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1410 gfp_t lockdep_reclaim_gfp; 1411 #endif 1412 1413 /* journalling filesystem info */ 1414 void *journal_info; 1415 1416 /* stacked block device info */ 1417 struct bio *bio_list, **bio_tail; 1418 1419 /* VM state */ 1420 struct reclaim_state *reclaim_state; 1421 1422 struct backing_dev_info *backing_dev_info; 1423 1424 struct io_context *io_context; 1425 1426 unsigned long ptrace_message; 1427 siginfo_t *last_siginfo; /* For ptrace use. */ 1428 struct task_io_accounting ioac; 1429 #if defined(CONFIG_TASK_XACCT) 1430 u64 acct_rss_mem1; /* accumulated rss usage */ 1431 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1432 cputime_t acct_timexpd; /* stime + utime since last update */ 1433 #endif 1434 #ifdef CONFIG_CPUSETS 1435 nodemask_t mems_allowed; /* Protected by alloc_lock */ 1436 int cpuset_mem_spread_rotor; 1437 #endif 1438 #ifdef CONFIG_CGROUPS 1439 /* Control Group info protected by css_set_lock */ 1440 struct css_set *cgroups; 1441 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1442 struct list_head cg_list; 1443 #endif 1444 #ifdef CONFIG_FUTEX 1445 struct robust_list_head __user *robust_list; 1446 #ifdef CONFIG_COMPAT 1447 struct compat_robust_list_head __user *compat_robust_list; 1448 #endif 1449 struct list_head pi_state_list; 1450 struct futex_pi_state *pi_state_cache; 1451 #endif 1452 #ifdef CONFIG_PERF_COUNTERS 1453 struct perf_counter_context *perf_counter_ctxp; 1454 struct mutex perf_counter_mutex; 1455 struct list_head perf_counter_list; 1456 #endif 1457 #ifdef CONFIG_NUMA 1458 struct mempolicy *mempolicy; /* Protected by alloc_lock */ 1459 short il_next; 1460 #endif 1461 atomic_t fs_excl; /* holding fs exclusive resources */ 1462 struct rcu_head rcu; 1463 1464 /* 1465 * cache last used pipe for splice 1466 */ 1467 struct pipe_inode_info *splice_pipe; 1468 #ifdef CONFIG_TASK_DELAY_ACCT 1469 struct task_delay_info *delays; 1470 #endif 1471 #ifdef CONFIG_FAULT_INJECTION 1472 int make_it_fail; 1473 #endif 1474 struct prop_local_single dirties; 1475 #ifdef CONFIG_LATENCYTOP 1476 int latency_record_count; 1477 struct latency_record latency_record[LT_SAVECOUNT]; 1478 #endif 1479 /* 1480 * time slack values; these are used to round up poll() and 1481 * select() etc timeout values. These are in nanoseconds. 1482 */ 1483 unsigned long timer_slack_ns; 1484 unsigned long default_timer_slack_ns; 1485 1486 struct list_head *scm_work_list; 1487 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1488 /* Index of current stored adress in ret_stack */ 1489 int curr_ret_stack; 1490 /* Stack of return addresses for return function tracing */ 1491 struct ftrace_ret_stack *ret_stack; 1492 /* time stamp for last schedule */ 1493 unsigned long long ftrace_timestamp; 1494 /* 1495 * Number of functions that haven't been traced 1496 * because of depth overrun. 1497 */ 1498 atomic_t trace_overrun; 1499 /* Pause for the tracing */ 1500 atomic_t tracing_graph_pause; 1501 #endif 1502 #ifdef CONFIG_TRACING 1503 /* state flags for use by tracers */ 1504 unsigned long trace; 1505 /* bitmask of trace recursion */ 1506 unsigned long trace_recursion; 1507 #endif /* CONFIG_TRACING */ 1508 }; 1509 1510 /* Future-safe accessor for struct task_struct's cpus_allowed. */ 1511 #define tsk_cpumask(tsk) (&(tsk)->cpus_allowed) 1512 1513 /* 1514 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1515 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1516 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1517 * values are inverted: lower p->prio value means higher priority. 1518 * 1519 * The MAX_USER_RT_PRIO value allows the actual maximum 1520 * RT priority to be separate from the value exported to 1521 * user-space. This allows kernel threads to set their 1522 * priority to a value higher than any user task. Note: 1523 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1524 */ 1525 1526 #define MAX_USER_RT_PRIO 100 1527 #define MAX_RT_PRIO MAX_USER_RT_PRIO 1528 1529 #define MAX_PRIO (MAX_RT_PRIO + 40) 1530 #define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1531 1532 static inline int rt_prio(int prio) 1533 { 1534 if (unlikely(prio < MAX_RT_PRIO)) 1535 return 1; 1536 return 0; 1537 } 1538 1539 static inline int rt_task(struct task_struct *p) 1540 { 1541 return rt_prio(p->prio); 1542 } 1543 1544 static inline struct pid *task_pid(struct task_struct *task) 1545 { 1546 return task->pids[PIDTYPE_PID].pid; 1547 } 1548 1549 static inline struct pid *task_tgid(struct task_struct *task) 1550 { 1551 return task->group_leader->pids[PIDTYPE_PID].pid; 1552 } 1553 1554 /* 1555 * Without tasklist or rcu lock it is not safe to dereference 1556 * the result of task_pgrp/task_session even if task == current, 1557 * we can race with another thread doing sys_setsid/sys_setpgid. 1558 */ 1559 static inline struct pid *task_pgrp(struct task_struct *task) 1560 { 1561 return task->group_leader->pids[PIDTYPE_PGID].pid; 1562 } 1563 1564 static inline struct pid *task_session(struct task_struct *task) 1565 { 1566 return task->group_leader->pids[PIDTYPE_SID].pid; 1567 } 1568 1569 struct pid_namespace; 1570 1571 /* 1572 * the helpers to get the task's different pids as they are seen 1573 * from various namespaces 1574 * 1575 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1576 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 1577 * current. 1578 * task_xid_nr_ns() : id seen from the ns specified; 1579 * 1580 * set_task_vxid() : assigns a virtual id to a task; 1581 * 1582 * see also pid_nr() etc in include/linux/pid.h 1583 */ 1584 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, 1585 struct pid_namespace *ns); 1586 1587 static inline pid_t task_pid_nr(struct task_struct *tsk) 1588 { 1589 return tsk->pid; 1590 } 1591 1592 static inline pid_t task_pid_nr_ns(struct task_struct *tsk, 1593 struct pid_namespace *ns) 1594 { 1595 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); 1596 } 1597 1598 static inline pid_t task_pid_vnr(struct task_struct *tsk) 1599 { 1600 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); 1601 } 1602 1603 1604 static inline pid_t task_tgid_nr(struct task_struct *tsk) 1605 { 1606 return tsk->tgid; 1607 } 1608 1609 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1610 1611 static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1612 { 1613 return pid_vnr(task_tgid(tsk)); 1614 } 1615 1616 1617 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, 1618 struct pid_namespace *ns) 1619 { 1620 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); 1621 } 1622 1623 static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1624 { 1625 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); 1626 } 1627 1628 1629 static inline pid_t task_session_nr_ns(struct task_struct *tsk, 1630 struct pid_namespace *ns) 1631 { 1632 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); 1633 } 1634 1635 static inline pid_t task_session_vnr(struct task_struct *tsk) 1636 { 1637 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); 1638 } 1639 1640 /* obsolete, do not use */ 1641 static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1642 { 1643 return task_pgrp_nr_ns(tsk, &init_pid_ns); 1644 } 1645 1646 /** 1647 * pid_alive - check that a task structure is not stale 1648 * @p: Task structure to be checked. 1649 * 1650 * Test if a process is not yet dead (at most zombie state) 1651 * If pid_alive fails, then pointers within the task structure 1652 * can be stale and must not be dereferenced. 1653 */ 1654 static inline int pid_alive(struct task_struct *p) 1655 { 1656 return p->pids[PIDTYPE_PID].pid != NULL; 1657 } 1658 1659 /** 1660 * is_global_init - check if a task structure is init 1661 * @tsk: Task structure to be checked. 1662 * 1663 * Check if a task structure is the first user space task the kernel created. 1664 */ 1665 static inline int is_global_init(struct task_struct *tsk) 1666 { 1667 return tsk->pid == 1; 1668 } 1669 1670 /* 1671 * is_container_init: 1672 * check whether in the task is init in its own pid namespace. 1673 */ 1674 extern int is_container_init(struct task_struct *tsk); 1675 1676 extern struct pid *cad_pid; 1677 1678 extern void free_task(struct task_struct *tsk); 1679 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1680 1681 extern void __put_task_struct(struct task_struct *t); 1682 1683 static inline void put_task_struct(struct task_struct *t) 1684 { 1685 if (atomic_dec_and_test(&t->usage)) 1686 __put_task_struct(t); 1687 } 1688 1689 extern cputime_t task_utime(struct task_struct *p); 1690 extern cputime_t task_stime(struct task_struct *p); 1691 extern cputime_t task_gtime(struct task_struct *p); 1692 1693 /* 1694 * Per process flags 1695 */ 1696 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 1697 /* Not implemented yet, only for 486*/ 1698 #define PF_STARTING 0x00000002 /* being created */ 1699 #define PF_EXITING 0x00000004 /* getting shut down */ 1700 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1701 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1702 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1703 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1704 #define PF_DUMPCORE 0x00000200 /* dumped core */ 1705 #define PF_SIGNALED 0x00000400 /* killed by a signal */ 1706 #define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1707 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 1708 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1709 #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */ 1710 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1711 #define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1712 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1713 #define PF_KSWAPD 0x00040000 /* I am kswapd */ 1714 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 1715 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1716 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ 1717 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1718 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1719 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1720 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1721 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ 1722 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1723 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1724 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1725 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ 1726 1727 /* 1728 * Only the _current_ task can read/write to tsk->flags, but other 1729 * tasks can access tsk->flags in readonly mode for example 1730 * with tsk_used_math (like during threaded core dumping). 1731 * There is however an exception to this rule during ptrace 1732 * or during fork: the ptracer task is allowed to write to the 1733 * child->flags of its traced child (same goes for fork, the parent 1734 * can write to the child->flags), because we're guaranteed the 1735 * child is not running and in turn not changing child->flags 1736 * at the same time the parent does it. 1737 */ 1738 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1739 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1740 #define clear_used_math() clear_stopped_child_used_math(current) 1741 #define set_used_math() set_stopped_child_used_math(current) 1742 #define conditional_stopped_child_used_math(condition, child) \ 1743 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1744 #define conditional_used_math(condition) \ 1745 conditional_stopped_child_used_math(condition, current) 1746 #define copy_to_stopped_child_used_math(child) \ 1747 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1748 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1749 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1750 #define used_math() tsk_used_math(current) 1751 1752 #ifdef CONFIG_TREE_PREEMPT_RCU 1753 1754 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ 1755 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ 1756 #define RCU_READ_UNLOCK_GOT_QS (1 << 2) /* CPU has responded to RCU core. */ 1757 1758 static inline void rcu_copy_process(struct task_struct *p) 1759 { 1760 p->rcu_read_lock_nesting = 0; 1761 p->rcu_read_unlock_special = 0; 1762 p->rcu_blocked_node = NULL; 1763 INIT_LIST_HEAD(&p->rcu_node_entry); 1764 } 1765 1766 #else 1767 1768 static inline void rcu_copy_process(struct task_struct *p) 1769 { 1770 } 1771 1772 #endif 1773 1774 #ifdef CONFIG_SMP 1775 extern int set_cpus_allowed_ptr(struct task_struct *p, 1776 const struct cpumask *new_mask); 1777 #else 1778 static inline int set_cpus_allowed_ptr(struct task_struct *p, 1779 const struct cpumask *new_mask) 1780 { 1781 if (!cpumask_test_cpu(0, new_mask)) 1782 return -EINVAL; 1783 return 0; 1784 } 1785 #endif 1786 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1787 { 1788 return set_cpus_allowed_ptr(p, &new_mask); 1789 } 1790 1791 /* 1792 * Architectures can set this to 1 if they have specified 1793 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, 1794 * but then during bootup it turns out that sched_clock() 1795 * is reliable after all: 1796 */ 1797 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1798 extern int sched_clock_stable; 1799 #endif 1800 1801 extern unsigned long long sched_clock(void); 1802 1803 extern void sched_clock_init(void); 1804 extern u64 sched_clock_cpu(int cpu); 1805 1806 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1807 static inline void sched_clock_tick(void) 1808 { 1809 } 1810 1811 static inline void sched_clock_idle_sleep_event(void) 1812 { 1813 } 1814 1815 static inline void sched_clock_idle_wakeup_event(u64 delta_ns) 1816 { 1817 } 1818 #else 1819 extern void sched_clock_tick(void); 1820 extern void sched_clock_idle_sleep_event(void); 1821 extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1822 #endif 1823 1824 /* 1825 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1826 * clock constructed from sched_clock(): 1827 */ 1828 extern unsigned long long cpu_clock(int cpu); 1829 1830 extern unsigned long long 1831 task_sched_runtime(struct task_struct *task); 1832 extern unsigned long long thread_group_sched_runtime(struct task_struct *task); 1833 1834 /* sched_exec is called by processes performing an exec */ 1835 #ifdef CONFIG_SMP 1836 extern void sched_exec(void); 1837 #else 1838 #define sched_exec() {} 1839 #endif 1840 1841 extern void sched_clock_idle_sleep_event(void); 1842 extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1843 1844 #ifdef CONFIG_HOTPLUG_CPU 1845 extern void idle_task_exit(void); 1846 #else 1847 static inline void idle_task_exit(void) {} 1848 #endif 1849 1850 extern void sched_idle_next(void); 1851 1852 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) 1853 extern void wake_up_idle_cpu(int cpu); 1854 #else 1855 static inline void wake_up_idle_cpu(int cpu) { } 1856 #endif 1857 1858 extern unsigned int sysctl_sched_latency; 1859 extern unsigned int sysctl_sched_min_granularity; 1860 extern unsigned int sysctl_sched_wakeup_granularity; 1861 extern unsigned int sysctl_sched_shares_ratelimit; 1862 extern unsigned int sysctl_sched_shares_thresh; 1863 extern unsigned int sysctl_sched_child_runs_first; 1864 #ifdef CONFIG_SCHED_DEBUG 1865 extern unsigned int sysctl_sched_features; 1866 extern unsigned int sysctl_sched_migration_cost; 1867 extern unsigned int sysctl_sched_nr_migrate; 1868 extern unsigned int sysctl_sched_time_avg; 1869 extern unsigned int sysctl_timer_migration; 1870 1871 int sched_nr_latency_handler(struct ctl_table *table, int write, 1872 struct file *file, void __user *buffer, size_t *length, 1873 loff_t *ppos); 1874 #endif 1875 #ifdef CONFIG_SCHED_DEBUG 1876 static inline unsigned int get_sysctl_timer_migration(void) 1877 { 1878 return sysctl_timer_migration; 1879 } 1880 #else 1881 static inline unsigned int get_sysctl_timer_migration(void) 1882 { 1883 return 1; 1884 } 1885 #endif 1886 extern unsigned int sysctl_sched_rt_period; 1887 extern int sysctl_sched_rt_runtime; 1888 1889 int sched_rt_handler(struct ctl_table *table, int write, 1890 struct file *filp, void __user *buffer, size_t *lenp, 1891 loff_t *ppos); 1892 1893 extern unsigned int sysctl_sched_compat_yield; 1894 1895 #ifdef CONFIG_RT_MUTEXES 1896 extern int rt_mutex_getprio(struct task_struct *p); 1897 extern void rt_mutex_setprio(struct task_struct *p, int prio); 1898 extern void rt_mutex_adjust_pi(struct task_struct *p); 1899 #else 1900 static inline int rt_mutex_getprio(struct task_struct *p) 1901 { 1902 return p->normal_prio; 1903 } 1904 # define rt_mutex_adjust_pi(p) do { } while (0) 1905 #endif 1906 1907 extern void set_user_nice(struct task_struct *p, long nice); 1908 extern int task_prio(const struct task_struct *p); 1909 extern int task_nice(const struct task_struct *p); 1910 extern int can_nice(const struct task_struct *p, const int nice); 1911 extern int task_curr(const struct task_struct *p); 1912 extern int idle_cpu(int cpu); 1913 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1914 extern int sched_setscheduler_nocheck(struct task_struct *, int, 1915 struct sched_param *); 1916 extern struct task_struct *idle_task(int cpu); 1917 extern struct task_struct *curr_task(int cpu); 1918 extern void set_curr_task(int cpu, struct task_struct *p); 1919 1920 void yield(void); 1921 1922 /* 1923 * The default (Linux) execution domain. 1924 */ 1925 extern struct exec_domain default_exec_domain; 1926 1927 union thread_union { 1928 struct thread_info thread_info; 1929 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1930 }; 1931 1932 #ifndef __HAVE_ARCH_KSTACK_END 1933 static inline int kstack_end(void *addr) 1934 { 1935 /* Reliable end of stack detection: 1936 * Some APM bios versions misalign the stack 1937 */ 1938 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1939 } 1940 #endif 1941 1942 extern union thread_union init_thread_union; 1943 extern struct task_struct init_task; 1944 1945 extern struct mm_struct init_mm; 1946 1947 extern struct pid_namespace init_pid_ns; 1948 1949 /* 1950 * find a task by one of its numerical ids 1951 * 1952 * find_task_by_pid_ns(): 1953 * finds a task by its pid in the specified namespace 1954 * find_task_by_vpid(): 1955 * finds a task by its virtual pid 1956 * 1957 * see also find_vpid() etc in include/linux/pid.h 1958 */ 1959 1960 extern struct task_struct *find_task_by_vpid(pid_t nr); 1961 extern struct task_struct *find_task_by_pid_ns(pid_t nr, 1962 struct pid_namespace *ns); 1963 1964 extern void __set_special_pids(struct pid *pid); 1965 1966 /* per-UID process charging. */ 1967 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 1968 static inline struct user_struct *get_uid(struct user_struct *u) 1969 { 1970 atomic_inc(&u->__count); 1971 return u; 1972 } 1973 extern void free_uid(struct user_struct *); 1974 extern void release_uids(struct user_namespace *ns); 1975 1976 #include <asm/current.h> 1977 1978 extern void do_timer(unsigned long ticks); 1979 1980 extern int wake_up_state(struct task_struct *tsk, unsigned int state); 1981 extern int wake_up_process(struct task_struct *tsk); 1982 extern void wake_up_new_task(struct task_struct *tsk, 1983 unsigned long clone_flags); 1984 #ifdef CONFIG_SMP 1985 extern void kick_process(struct task_struct *tsk); 1986 #else 1987 static inline void kick_process(struct task_struct *tsk) { } 1988 #endif 1989 extern void sched_fork(struct task_struct *p, int clone_flags); 1990 extern void sched_dead(struct task_struct *p); 1991 1992 extern void proc_caches_init(void); 1993 extern void flush_signals(struct task_struct *); 1994 extern void __flush_signals(struct task_struct *); 1995 extern void ignore_signals(struct task_struct *); 1996 extern void flush_signal_handlers(struct task_struct *, int force_default); 1997 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 1998 1999 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 2000 { 2001 unsigned long flags; 2002 int ret; 2003 2004 spin_lock_irqsave(&tsk->sighand->siglock, flags); 2005 ret = dequeue_signal(tsk, mask, info); 2006 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 2007 2008 return ret; 2009 } 2010 2011 extern void block_all_signals(int (*notifier)(void *priv), void *priv, 2012 sigset_t *mask); 2013 extern void unblock_all_signals(void); 2014 extern void release_task(struct task_struct * p); 2015 extern int send_sig_info(int, struct siginfo *, struct task_struct *); 2016 extern int force_sigsegv(int, struct task_struct *); 2017 extern int force_sig_info(int, struct siginfo *, struct task_struct *); 2018 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 2019 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 2020 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 2021 extern int kill_pgrp(struct pid *pid, int sig, int priv); 2022 extern int kill_pid(struct pid *pid, int sig, int priv); 2023 extern int kill_proc_info(int, struct siginfo *, pid_t); 2024 extern int do_notify_parent(struct task_struct *, int); 2025 extern void force_sig(int, struct task_struct *); 2026 extern void force_sig_specific(int, struct task_struct *); 2027 extern int send_sig(int, struct task_struct *, int); 2028 extern void zap_other_threads(struct task_struct *p); 2029 extern struct sigqueue *sigqueue_alloc(void); 2030 extern void sigqueue_free(struct sigqueue *); 2031 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); 2032 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 2033 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 2034 2035 static inline int kill_cad_pid(int sig, int priv) 2036 { 2037 return kill_pid(cad_pid, sig, priv); 2038 } 2039 2040 /* These can be the second arg to send_sig_info/send_group_sig_info. */ 2041 #define SEND_SIG_NOINFO ((struct siginfo *) 0) 2042 #define SEND_SIG_PRIV ((struct siginfo *) 1) 2043 #define SEND_SIG_FORCED ((struct siginfo *) 2) 2044 2045 static inline int is_si_special(const struct siginfo *info) 2046 { 2047 return info <= SEND_SIG_FORCED; 2048 } 2049 2050 /* True if we are on the alternate signal stack. */ 2051 2052 static inline int on_sig_stack(unsigned long sp) 2053 { 2054 return (sp - current->sas_ss_sp < current->sas_ss_size); 2055 } 2056 2057 static inline int sas_ss_flags(unsigned long sp) 2058 { 2059 return (current->sas_ss_size == 0 ? SS_DISABLE 2060 : on_sig_stack(sp) ? SS_ONSTACK : 0); 2061 } 2062 2063 /* 2064 * Routines for handling mm_structs 2065 */ 2066 extern struct mm_struct * mm_alloc(void); 2067 2068 /* mmdrop drops the mm and the page tables */ 2069 extern void __mmdrop(struct mm_struct *); 2070 static inline void mmdrop(struct mm_struct * mm) 2071 { 2072 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 2073 __mmdrop(mm); 2074 } 2075 2076 /* mmput gets rid of the mappings and all user-space */ 2077 extern void mmput(struct mm_struct *); 2078 /* Grab a reference to a task's mm, if it is not already going away */ 2079 extern struct mm_struct *get_task_mm(struct task_struct *task); 2080 /* Remove the current tasks stale references to the old mm_struct */ 2081 extern void mm_release(struct task_struct *, struct mm_struct *); 2082 /* Allocate a new mm structure and copy contents from tsk->mm */ 2083 extern struct mm_struct *dup_mm(struct task_struct *tsk); 2084 2085 extern int copy_thread(unsigned long, unsigned long, unsigned long, 2086 struct task_struct *, struct pt_regs *); 2087 extern void flush_thread(void); 2088 extern void exit_thread(void); 2089 2090 extern void exit_files(struct task_struct *); 2091 extern void __cleanup_signal(struct signal_struct *); 2092 extern void __cleanup_sighand(struct sighand_struct *); 2093 2094 extern void exit_itimers(struct signal_struct *); 2095 extern void flush_itimer_signals(void); 2096 2097 extern NORET_TYPE void do_group_exit(int); 2098 2099 extern void daemonize(const char *, ...); 2100 extern int allow_signal(int); 2101 extern int disallow_signal(int); 2102 2103 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 2104 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 2105 struct task_struct *fork_idle(int); 2106 2107 extern void set_task_comm(struct task_struct *tsk, char *from); 2108 extern char *get_task_comm(char *to, struct task_struct *tsk); 2109 2110 #ifdef CONFIG_SMP 2111 extern void wait_task_context_switch(struct task_struct *p); 2112 extern unsigned long wait_task_inactive(struct task_struct *, long match_state); 2113 #else 2114 static inline void wait_task_context_switch(struct task_struct *p) {} 2115 static inline unsigned long wait_task_inactive(struct task_struct *p, 2116 long match_state) 2117 { 2118 return 1; 2119 } 2120 #endif 2121 2122 #define next_task(p) \ 2123 list_entry_rcu((p)->tasks.next, struct task_struct, tasks) 2124 2125 #define for_each_process(p) \ 2126 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 2127 2128 extern bool current_is_single_threaded(void); 2129 2130 /* 2131 * Careful: do_each_thread/while_each_thread is a double loop so 2132 * 'break' will not work as expected - use goto instead. 2133 */ 2134 #define do_each_thread(g, t) \ 2135 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 2136 2137 #define while_each_thread(g, t) \ 2138 while ((t = next_thread(t)) != g) 2139 2140 /* de_thread depends on thread_group_leader not being a pid based check */ 2141 #define thread_group_leader(p) (p == p->group_leader) 2142 2143 /* Do to the insanities of de_thread it is possible for a process 2144 * to have the pid of the thread group leader without actually being 2145 * the thread group leader. For iteration through the pids in proc 2146 * all we care about is that we have a task with the appropriate 2147 * pid, we don't actually care if we have the right task. 2148 */ 2149 static inline int has_group_leader_pid(struct task_struct *p) 2150 { 2151 return p->pid == p->tgid; 2152 } 2153 2154 static inline 2155 int same_thread_group(struct task_struct *p1, struct task_struct *p2) 2156 { 2157 return p1->tgid == p2->tgid; 2158 } 2159 2160 static inline struct task_struct *next_thread(const struct task_struct *p) 2161 { 2162 return list_entry_rcu(p->thread_group.next, 2163 struct task_struct, thread_group); 2164 } 2165 2166 static inline int thread_group_empty(struct task_struct *p) 2167 { 2168 return list_empty(&p->thread_group); 2169 } 2170 2171 #define delay_group_leader(p) \ 2172 (thread_group_leader(p) && !thread_group_empty(p)) 2173 2174 static inline int task_detached(struct task_struct *p) 2175 { 2176 return p->exit_signal == -1; 2177 } 2178 2179 /* 2180 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 2181 * subscriptions and synchronises with wait4(). Also used in procfs. Also 2182 * pins the final release of task.io_context. Also protects ->cpuset and 2183 * ->cgroup.subsys[]. 2184 * 2185 * Nests both inside and outside of read_lock(&tasklist_lock). 2186 * It must not be nested with write_lock_irq(&tasklist_lock), 2187 * neither inside nor outside. 2188 */ 2189 static inline void task_lock(struct task_struct *p) 2190 { 2191 spin_lock(&p->alloc_lock); 2192 } 2193 2194 static inline void task_unlock(struct task_struct *p) 2195 { 2196 spin_unlock(&p->alloc_lock); 2197 } 2198 2199 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 2200 unsigned long *flags); 2201 2202 static inline void unlock_task_sighand(struct task_struct *tsk, 2203 unsigned long *flags) 2204 { 2205 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 2206 } 2207 2208 #ifndef __HAVE_THREAD_FUNCTIONS 2209 2210 #define task_thread_info(task) ((struct thread_info *)(task)->stack) 2211 #define task_stack_page(task) ((task)->stack) 2212 2213 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 2214 { 2215 *task_thread_info(p) = *task_thread_info(org); 2216 task_thread_info(p)->task = p; 2217 } 2218 2219 static inline unsigned long *end_of_stack(struct task_struct *p) 2220 { 2221 return (unsigned long *)(task_thread_info(p) + 1); 2222 } 2223 2224 #endif 2225 2226 static inline int object_is_on_stack(void *obj) 2227 { 2228 void *stack = task_stack_page(current); 2229 2230 return (obj >= stack) && (obj < (stack + THREAD_SIZE)); 2231 } 2232 2233 extern void thread_info_cache_init(void); 2234 2235 #ifdef CONFIG_DEBUG_STACK_USAGE 2236 static inline unsigned long stack_not_used(struct task_struct *p) 2237 { 2238 unsigned long *n = end_of_stack(p); 2239 2240 do { /* Skip over canary */ 2241 n++; 2242 } while (!*n); 2243 2244 return (unsigned long)n - (unsigned long)end_of_stack(p); 2245 } 2246 #endif 2247 2248 /* set thread flags in other task's structures 2249 * - see asm/thread_info.h for TIF_xxxx flags available 2250 */ 2251 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 2252 { 2253 set_ti_thread_flag(task_thread_info(tsk), flag); 2254 } 2255 2256 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2257 { 2258 clear_ti_thread_flag(task_thread_info(tsk), flag); 2259 } 2260 2261 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 2262 { 2263 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 2264 } 2265 2266 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2267 { 2268 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 2269 } 2270 2271 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 2272 { 2273 return test_ti_thread_flag(task_thread_info(tsk), flag); 2274 } 2275 2276 static inline void set_tsk_need_resched(struct task_struct *tsk) 2277 { 2278 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2279 } 2280 2281 static inline void clear_tsk_need_resched(struct task_struct *tsk) 2282 { 2283 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2284 } 2285 2286 static inline int test_tsk_need_resched(struct task_struct *tsk) 2287 { 2288 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); 2289 } 2290 2291 static inline int restart_syscall(void) 2292 { 2293 set_tsk_thread_flag(current, TIF_SIGPENDING); 2294 return -ERESTARTNOINTR; 2295 } 2296 2297 static inline int signal_pending(struct task_struct *p) 2298 { 2299 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 2300 } 2301 2302 extern int __fatal_signal_pending(struct task_struct *p); 2303 2304 static inline int fatal_signal_pending(struct task_struct *p) 2305 { 2306 return signal_pending(p) && __fatal_signal_pending(p); 2307 } 2308 2309 static inline int signal_pending_state(long state, struct task_struct *p) 2310 { 2311 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) 2312 return 0; 2313 if (!signal_pending(p)) 2314 return 0; 2315 2316 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); 2317 } 2318 2319 static inline int need_resched(void) 2320 { 2321 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 2322 } 2323 2324 /* 2325 * cond_resched() and cond_resched_lock(): latency reduction via 2326 * explicit rescheduling in places that are safe. The return 2327 * value indicates whether a reschedule was done in fact. 2328 * cond_resched_lock() will drop the spinlock before scheduling, 2329 * cond_resched_softirq() will enable bhs before scheduling. 2330 */ 2331 extern int _cond_resched(void); 2332 2333 #define cond_resched() ({ \ 2334 __might_sleep(__FILE__, __LINE__, 0); \ 2335 _cond_resched(); \ 2336 }) 2337 2338 extern int __cond_resched_lock(spinlock_t *lock); 2339 2340 #ifdef CONFIG_PREEMPT 2341 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET 2342 #else 2343 #define PREEMPT_LOCK_OFFSET 0 2344 #endif 2345 2346 #define cond_resched_lock(lock) ({ \ 2347 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ 2348 __cond_resched_lock(lock); \ 2349 }) 2350 2351 extern int __cond_resched_softirq(void); 2352 2353 #define cond_resched_softirq() ({ \ 2354 __might_sleep(__FILE__, __LINE__, SOFTIRQ_OFFSET); \ 2355 __cond_resched_softirq(); \ 2356 }) 2357 2358 /* 2359 * Does a critical section need to be broken due to another 2360 * task waiting?: (technically does not depend on CONFIG_PREEMPT, 2361 * but a general need for low latency) 2362 */ 2363 static inline int spin_needbreak(spinlock_t *lock) 2364 { 2365 #ifdef CONFIG_PREEMPT 2366 return spin_is_contended(lock); 2367 #else 2368 return 0; 2369 #endif 2370 } 2371 2372 /* 2373 * Thread group CPU time accounting. 2374 */ 2375 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); 2376 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); 2377 2378 static inline void thread_group_cputime_init(struct signal_struct *sig) 2379 { 2380 sig->cputimer.cputime = INIT_CPUTIME; 2381 spin_lock_init(&sig->cputimer.lock); 2382 sig->cputimer.running = 0; 2383 } 2384 2385 static inline void thread_group_cputime_free(struct signal_struct *sig) 2386 { 2387 } 2388 2389 /* 2390 * Reevaluate whether the task has signals pending delivery. 2391 * Wake the task if so. 2392 * This is required every time the blocked sigset_t changes. 2393 * callers must hold sighand->siglock. 2394 */ 2395 extern void recalc_sigpending_and_wake(struct task_struct *t); 2396 extern void recalc_sigpending(void); 2397 2398 extern void signal_wake_up(struct task_struct *t, int resume_stopped); 2399 2400 /* 2401 * Wrappers for p->thread_info->cpu access. No-op on UP. 2402 */ 2403 #ifdef CONFIG_SMP 2404 2405 static inline unsigned int task_cpu(const struct task_struct *p) 2406 { 2407 return task_thread_info(p)->cpu; 2408 } 2409 2410 extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 2411 2412 #else 2413 2414 static inline unsigned int task_cpu(const struct task_struct *p) 2415 { 2416 return 0; 2417 } 2418 2419 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 2420 { 2421 } 2422 2423 #endif /* CONFIG_SMP */ 2424 2425 extern void arch_pick_mmap_layout(struct mm_struct *mm); 2426 2427 #ifdef CONFIG_TRACING 2428 extern void 2429 __trace_special(void *__tr, void *__data, 2430 unsigned long arg1, unsigned long arg2, unsigned long arg3); 2431 #else 2432 static inline void 2433 __trace_special(void *__tr, void *__data, 2434 unsigned long arg1, unsigned long arg2, unsigned long arg3) 2435 { 2436 } 2437 #endif 2438 2439 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); 2440 extern long sched_getaffinity(pid_t pid, struct cpumask *mask); 2441 2442 extern void normalize_rt_tasks(void); 2443 2444 #ifdef CONFIG_GROUP_SCHED 2445 2446 extern struct task_group init_task_group; 2447 #ifdef CONFIG_USER_SCHED 2448 extern struct task_group root_task_group; 2449 extern void set_tg_uid(struct user_struct *user); 2450 #endif 2451 2452 extern struct task_group *sched_create_group(struct task_group *parent); 2453 extern void sched_destroy_group(struct task_group *tg); 2454 extern void sched_move_task(struct task_struct *tsk); 2455 #ifdef CONFIG_FAIR_GROUP_SCHED 2456 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 2457 extern unsigned long sched_group_shares(struct task_group *tg); 2458 #endif 2459 #ifdef CONFIG_RT_GROUP_SCHED 2460 extern int sched_group_set_rt_runtime(struct task_group *tg, 2461 long rt_runtime_us); 2462 extern long sched_group_rt_runtime(struct task_group *tg); 2463 extern int sched_group_set_rt_period(struct task_group *tg, 2464 long rt_period_us); 2465 extern long sched_group_rt_period(struct task_group *tg); 2466 extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); 2467 #endif 2468 #endif 2469 2470 extern int task_can_switch_user(struct user_struct *up, 2471 struct task_struct *tsk); 2472 2473 #ifdef CONFIG_TASK_XACCT 2474 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2475 { 2476 tsk->ioac.rchar += amt; 2477 } 2478 2479 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2480 { 2481 tsk->ioac.wchar += amt; 2482 } 2483 2484 static inline void inc_syscr(struct task_struct *tsk) 2485 { 2486 tsk->ioac.syscr++; 2487 } 2488 2489 static inline void inc_syscw(struct task_struct *tsk) 2490 { 2491 tsk->ioac.syscw++; 2492 } 2493 #else 2494 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2495 { 2496 } 2497 2498 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2499 { 2500 } 2501 2502 static inline void inc_syscr(struct task_struct *tsk) 2503 { 2504 } 2505 2506 static inline void inc_syscw(struct task_struct *tsk) 2507 { 2508 } 2509 #endif 2510 2511 #ifndef TASK_SIZE_OF 2512 #define TASK_SIZE_OF(tsk) TASK_SIZE 2513 #endif 2514 2515 /* 2516 * Call the function if the target task is executing on a CPU right now: 2517 */ 2518 extern void task_oncpu_function_call(struct task_struct *p, 2519 void (*func) (void *info), void *info); 2520 2521 2522 #ifdef CONFIG_MM_OWNER 2523 extern void mm_update_next_owner(struct mm_struct *mm); 2524 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); 2525 #else 2526 static inline void mm_update_next_owner(struct mm_struct *mm) 2527 { 2528 } 2529 2530 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) 2531 { 2532 } 2533 #endif /* CONFIG_MM_OWNER */ 2534 2535 #define TASK_STATE_TO_CHAR_STR "RSDTtZX" 2536 2537 #endif /* __KERNEL__ */ 2538 2539 #endif 2540