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