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 bts_context; 103 struct perf_event_context; 104 105 /* 106 * List of flags we want to share for kernel threads, 107 * if only because they are not used by them anyway. 108 */ 109 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 110 111 /* 112 * These are the constant used to fake the fixed-point load-average 113 * counting. Some notes: 114 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 115 * a load-average precision of 10 bits integer + 11 bits fractional 116 * - if you want to count load-averages more often, you need more 117 * precision, or rounding will get you. With 2-second counting freq, 118 * the EXP_n values would be 1981, 2034 and 2043 if still using only 119 * 11 bit fractions. 120 */ 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 unsigned long nr_iowait_cpu(void); 144 extern unsigned long this_cpu_load(void); 145 146 147 extern void calc_global_load(void); 148 149 extern unsigned long get_parent_ip(unsigned long addr); 150 151 struct seq_file; 152 struct cfs_rq; 153 struct task_group; 154 #ifdef CONFIG_SCHED_DEBUG 155 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 156 extern void proc_sched_set_task(struct task_struct *p); 157 extern void 158 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 159 #else 160 static inline void 161 proc_sched_show_task(struct task_struct *p, struct seq_file *m) 162 { 163 } 164 static inline void proc_sched_set_task(struct task_struct *p) 165 { 166 } 167 static inline void 168 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 169 { 170 } 171 #endif 172 173 /* 174 * Task state bitmask. NOTE! These bits are also 175 * encoded in fs/proc/array.c: get_task_state(). 176 * 177 * We have two separate sets of flags: task->state 178 * is about runnability, while task->exit_state are 179 * about the task exiting. Confusing, but this way 180 * modifying one set can't modify the other one by 181 * mistake. 182 */ 183 #define TASK_RUNNING 0 184 #define TASK_INTERRUPTIBLE 1 185 #define TASK_UNINTERRUPTIBLE 2 186 #define __TASK_STOPPED 4 187 #define __TASK_TRACED 8 188 /* in tsk->exit_state */ 189 #define EXIT_ZOMBIE 16 190 #define EXIT_DEAD 32 191 /* in tsk->state again */ 192 #define TASK_DEAD 64 193 #define TASK_WAKEKILL 128 194 #define TASK_WAKING 256 195 #define TASK_STATE_MAX 512 196 197 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW" 198 199 extern char ___assert_task_state[1 - 2*!!( 200 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; 201 202 /* Convenience macros for the sake of set_task_state */ 203 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) 204 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) 205 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) 206 207 /* Convenience macros for the sake of wake_up */ 208 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 209 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) 210 211 /* get_task_state() */ 212 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ 213 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ 214 __TASK_TRACED) 215 216 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) 217 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) 218 #define task_is_stopped_or_traced(task) \ 219 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) 220 #define task_contributes_to_load(task) \ 221 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ 222 (task->flags & PF_FREEZING) == 0) 223 224 #define __set_task_state(tsk, state_value) \ 225 do { (tsk)->state = (state_value); } while (0) 226 #define set_task_state(tsk, state_value) \ 227 set_mb((tsk)->state, (state_value)) 228 229 /* 230 * set_current_state() includes a barrier so that the write of current->state 231 * is correctly serialised wrt the caller's subsequent test of whether to 232 * actually sleep: 233 * 234 * set_current_state(TASK_UNINTERRUPTIBLE); 235 * if (do_i_need_to_sleep()) 236 * schedule(); 237 * 238 * If the caller does not need such serialisation then use __set_current_state() 239 */ 240 #define __set_current_state(state_value) \ 241 do { current->state = (state_value); } while (0) 242 #define set_current_state(state_value) \ 243 set_mb(current->state, (state_value)) 244 245 /* Task command name length */ 246 #define TASK_COMM_LEN 16 247 248 #include <linux/spinlock.h> 249 250 /* 251 * This serializes "schedule()" and also protects 252 * the run-queue from deletions/modifications (but 253 * _adding_ to the beginning of the run-queue has 254 * a separate lock). 255 */ 256 extern rwlock_t tasklist_lock; 257 extern spinlock_t mmlist_lock; 258 259 struct task_struct; 260 261 extern void sched_init(void); 262 extern void sched_init_smp(void); 263 extern asmlinkage void schedule_tail(struct task_struct *prev); 264 extern void init_idle(struct task_struct *idle, int cpu); 265 extern void init_idle_bootup_task(struct task_struct *idle); 266 267 extern int runqueue_is_locked(int cpu); 268 extern void task_rq_unlock_wait(struct task_struct *p); 269 270 extern cpumask_var_t nohz_cpu_mask; 271 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 272 extern int select_nohz_load_balancer(int cpu); 273 extern int get_nohz_load_balancer(void); 274 #else 275 static inline int select_nohz_load_balancer(int cpu) 276 { 277 return 0; 278 } 279 #endif 280 281 /* 282 * Only dump TASK_* tasks. (0 for all tasks) 283 */ 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_DETECT_SOFTLOCKUP 311 extern void softlockup_tick(void); 312 extern void touch_softlockup_watchdog(void); 313 extern void touch_softlockup_watchdog_sync(void); 314 extern void touch_all_softlockup_watchdogs(void); 315 extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write, 316 void __user *buffer, 317 size_t *lenp, loff_t *ppos); 318 extern unsigned int softlockup_panic; 319 extern int softlockup_thresh; 320 #else 321 static inline void softlockup_tick(void) 322 { 323 } 324 static inline void touch_softlockup_watchdog(void) 325 { 326 } 327 static inline void touch_softlockup_watchdog_sync(void) 328 { 329 } 330 static inline void touch_all_softlockup_watchdogs(void) 331 { 332 } 333 #endif 334 335 #ifdef CONFIG_DETECT_HUNG_TASK 336 extern unsigned int sysctl_hung_task_panic; 337 extern unsigned long sysctl_hung_task_check_count; 338 extern unsigned long sysctl_hung_task_timeout_secs; 339 extern unsigned long sysctl_hung_task_warnings; 340 extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, 341 void __user *buffer, 342 size_t *lenp, loff_t *ppos); 343 #endif 344 345 /* Attach to any functions which should be ignored in wchan output. */ 346 #define __sched __attribute__((__section__(".sched.text"))) 347 348 /* Linker adds these: start and end of __sched functions */ 349 extern char __sched_text_start[], __sched_text_end[]; 350 351 /* Is this address in the __sched functions? */ 352 extern int in_sched_functions(unsigned long addr); 353 354 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 355 extern signed long schedule_timeout(signed long timeout); 356 extern signed long schedule_timeout_interruptible(signed long timeout); 357 extern signed long schedule_timeout_killable(signed long timeout); 358 extern signed long schedule_timeout_uninterruptible(signed long timeout); 359 asmlinkage void schedule(void); 360 extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner); 361 362 struct nsproxy; 363 struct user_namespace; 364 365 /* 366 * Default maximum number of active map areas, this limits the number of vmas 367 * per mm struct. Users can overwrite this number by sysctl but there is a 368 * problem. 369 * 370 * When a program's coredump is generated as ELF format, a section is created 371 * per a vma. In ELF, the number of sections is represented in unsigned short. 372 * This means the number of sections should be smaller than 65535 at coredump. 373 * Because the kernel adds some informative sections to a image of program at 374 * generating coredump, we need some margin. The number of extra sections is 375 * 1-3 now and depends on arch. We use "5" as safe margin, here. 376 */ 377 #define MAPCOUNT_ELF_CORE_MARGIN (5) 378 #define DEFAULT_MAX_MAP_COUNT (USHORT_MAX - MAPCOUNT_ELF_CORE_MARGIN) 379 380 extern int sysctl_max_map_count; 381 382 #include <linux/aio.h> 383 384 #ifdef CONFIG_MMU 385 extern void arch_pick_mmap_layout(struct mm_struct *mm); 386 extern unsigned long 387 arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 388 unsigned long, unsigned long); 389 extern unsigned long 390 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 391 unsigned long len, unsigned long pgoff, 392 unsigned long flags); 393 extern void arch_unmap_area(struct mm_struct *, unsigned long); 394 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 395 #else 396 static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} 397 #endif 398 399 400 extern void set_dumpable(struct mm_struct *mm, int value); 401 extern int get_dumpable(struct mm_struct *mm); 402 403 /* mm flags */ 404 /* dumpable bits */ 405 #define MMF_DUMPABLE 0 /* core dump is permitted */ 406 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 407 408 #define MMF_DUMPABLE_BITS 2 409 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) 410 411 /* coredump filter bits */ 412 #define MMF_DUMP_ANON_PRIVATE 2 413 #define MMF_DUMP_ANON_SHARED 3 414 #define MMF_DUMP_MAPPED_PRIVATE 4 415 #define MMF_DUMP_MAPPED_SHARED 5 416 #define MMF_DUMP_ELF_HEADERS 6 417 #define MMF_DUMP_HUGETLB_PRIVATE 7 418 #define MMF_DUMP_HUGETLB_SHARED 8 419 420 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 421 #define MMF_DUMP_FILTER_BITS 7 422 #define MMF_DUMP_FILTER_MASK \ 423 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 424 #define MMF_DUMP_FILTER_DEFAULT \ 425 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ 426 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) 427 428 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS 429 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) 430 #else 431 # define MMF_DUMP_MASK_DEFAULT_ELF 0 432 #endif 433 /* leave room for more dump flags */ 434 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ 435 436 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) 437 438 struct sighand_struct { 439 atomic_t count; 440 struct k_sigaction action[_NSIG]; 441 spinlock_t siglock; 442 wait_queue_head_t signalfd_wqh; 443 }; 444 445 struct pacct_struct { 446 int ac_flag; 447 long ac_exitcode; 448 unsigned long ac_mem; 449 cputime_t ac_utime, ac_stime; 450 unsigned long ac_minflt, ac_majflt; 451 }; 452 453 struct cpu_itimer { 454 cputime_t expires; 455 cputime_t incr; 456 u32 error; 457 u32 incr_error; 458 }; 459 460 /** 461 * struct task_cputime - collected CPU time counts 462 * @utime: time spent in user mode, in &cputime_t units 463 * @stime: time spent in kernel mode, in &cputime_t units 464 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds 465 * 466 * This structure groups together three kinds of CPU time that are 467 * tracked for threads and thread groups. Most things considering 468 * CPU time want to group these counts together and treat all three 469 * of them in parallel. 470 */ 471 struct task_cputime { 472 cputime_t utime; 473 cputime_t stime; 474 unsigned long long sum_exec_runtime; 475 }; 476 /* Alternate field names when used to cache expirations. */ 477 #define prof_exp stime 478 #define virt_exp utime 479 #define sched_exp sum_exec_runtime 480 481 #define INIT_CPUTIME \ 482 (struct task_cputime) { \ 483 .utime = cputime_zero, \ 484 .stime = cputime_zero, \ 485 .sum_exec_runtime = 0, \ 486 } 487 488 /* 489 * Disable preemption until the scheduler is running. 490 * Reset by start_kernel()->sched_init()->init_idle(). 491 * 492 * We include PREEMPT_ACTIVE to avoid cond_resched() from working 493 * before the scheduler is active -- see should_resched(). 494 */ 495 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) 496 497 /** 498 * struct thread_group_cputimer - thread group interval timer counts 499 * @cputime: thread group interval timers. 500 * @running: non-zero when there are timers running and 501 * @cputime receives updates. 502 * @lock: lock for fields in this struct. 503 * 504 * This structure contains the version of task_cputime, above, that is 505 * used for thread group CPU timer calculations. 506 */ 507 struct thread_group_cputimer { 508 struct task_cputime cputime; 509 int running; 510 spinlock_t lock; 511 }; 512 513 /* 514 * NOTE! "signal_struct" does not have it's own 515 * locking, because a shared signal_struct always 516 * implies a shared sighand_struct, so locking 517 * sighand_struct is always a proper superset of 518 * the locking of signal_struct. 519 */ 520 struct signal_struct { 521 atomic_t count; 522 atomic_t live; 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 }; 629 630 /* Context switch must be unlocked if interrupts are to be enabled */ 631 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 632 # define __ARCH_WANT_UNLOCKED_CTXSW 633 #endif 634 635 /* 636 * Bits in flags field of signal_struct. 637 */ 638 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 639 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 640 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 641 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 642 /* 643 * Pending notifications to parent. 644 */ 645 #define SIGNAL_CLD_STOPPED 0x00000010 646 #define SIGNAL_CLD_CONTINUED 0x00000020 647 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) 648 649 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ 650 651 /* If true, all threads except ->group_exit_task have pending SIGKILL */ 652 static inline int signal_group_exit(const struct signal_struct *sig) 653 { 654 return (sig->flags & SIGNAL_GROUP_EXIT) || 655 (sig->group_exit_task != NULL); 656 } 657 658 /* 659 * Some day this will be a full-fledged user tracking system.. 660 */ 661 struct user_struct { 662 atomic_t __count; /* reference count */ 663 atomic_t processes; /* How many processes does this user have? */ 664 atomic_t files; /* How many open files does this user have? */ 665 atomic_t sigpending; /* How many pending signals does this user have? */ 666 #ifdef CONFIG_INOTIFY_USER 667 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 668 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 669 #endif 670 #ifdef CONFIG_EPOLL 671 atomic_t epoll_watches; /* The number of file descriptors currently watched */ 672 #endif 673 #ifdef CONFIG_POSIX_MQUEUE 674 /* protected by mq_lock */ 675 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 676 #endif 677 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 678 679 #ifdef CONFIG_KEYS 680 struct key *uid_keyring; /* UID specific keyring */ 681 struct key *session_keyring; /* UID's default session keyring */ 682 #endif 683 684 /* Hash table maintenance information */ 685 struct hlist_node uidhash_node; 686 uid_t uid; 687 struct user_namespace *user_ns; 688 689 #ifdef CONFIG_PERF_EVENTS 690 atomic_long_t locked_vm; 691 #endif 692 }; 693 694 extern int uids_sysfs_init(void); 695 696 extern struct user_struct *find_user(uid_t); 697 698 extern struct user_struct root_user; 699 #define INIT_USER (&root_user) 700 701 702 struct backing_dev_info; 703 struct reclaim_state; 704 705 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 706 struct sched_info { 707 /* cumulative counters */ 708 unsigned long pcount; /* # of times run on this cpu */ 709 unsigned long long run_delay; /* time spent waiting on a runqueue */ 710 711 /* timestamps */ 712 unsigned long long last_arrival,/* when we last ran on a cpu */ 713 last_queued; /* when we were last queued to run */ 714 #ifdef CONFIG_SCHEDSTATS 715 /* BKL stats */ 716 unsigned int bkl_count; 717 #endif 718 }; 719 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 720 721 #ifdef CONFIG_TASK_DELAY_ACCT 722 struct task_delay_info { 723 spinlock_t lock; 724 unsigned int flags; /* Private per-task flags */ 725 726 /* For each stat XXX, add following, aligned appropriately 727 * 728 * struct timespec XXX_start, XXX_end; 729 * u64 XXX_delay; 730 * u32 XXX_count; 731 * 732 * Atomicity of updates to XXX_delay, XXX_count protected by 733 * single lock above (split into XXX_lock if contention is an issue). 734 */ 735 736 /* 737 * XXX_count is incremented on every XXX operation, the delay 738 * associated with the operation is added to XXX_delay. 739 * XXX_delay contains the accumulated delay time in nanoseconds. 740 */ 741 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 742 u64 blkio_delay; /* wait for sync block io completion */ 743 u64 swapin_delay; /* wait for swapin block io completion */ 744 u32 blkio_count; /* total count of the number of sync block */ 745 /* io operations performed */ 746 u32 swapin_count; /* total count of the number of swapin block */ 747 /* io operations performed */ 748 749 struct timespec freepages_start, freepages_end; 750 u64 freepages_delay; /* wait for memory reclaim */ 751 u32 freepages_count; /* total count of memory reclaim */ 752 }; 753 #endif /* CONFIG_TASK_DELAY_ACCT */ 754 755 static inline int sched_info_on(void) 756 { 757 #ifdef CONFIG_SCHEDSTATS 758 return 1; 759 #elif defined(CONFIG_TASK_DELAY_ACCT) 760 extern int delayacct_on; 761 return delayacct_on; 762 #else 763 return 0; 764 #endif 765 } 766 767 enum cpu_idle_type { 768 CPU_IDLE, 769 CPU_NOT_IDLE, 770 CPU_NEWLY_IDLE, 771 CPU_MAX_IDLE_TYPES 772 }; 773 774 /* 775 * sched-domains (multiprocessor balancing) declarations: 776 */ 777 778 /* 779 * Increase resolution of nice-level calculations: 780 */ 781 #define SCHED_LOAD_SHIFT 10 782 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 783 784 #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE 785 786 #ifdef CONFIG_SMP 787 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ 788 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ 789 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ 790 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ 791 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ 792 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ 793 #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */ 794 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ 795 #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */ 796 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ 797 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ 798 799 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ 800 801 enum powersavings_balance_level { 802 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ 803 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package 804 * first for long running threads 805 */ 806 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle 807 * cpu package for power savings 808 */ 809 MAX_POWERSAVINGS_BALANCE_LEVELS 810 }; 811 812 extern int sched_mc_power_savings, sched_smt_power_savings; 813 814 static inline int sd_balance_for_mc_power(void) 815 { 816 if (sched_smt_power_savings) 817 return SD_POWERSAVINGS_BALANCE; 818 819 if (!sched_mc_power_savings) 820 return SD_PREFER_SIBLING; 821 822 return 0; 823 } 824 825 static inline int sd_balance_for_package_power(void) 826 { 827 if (sched_mc_power_savings | sched_smt_power_savings) 828 return SD_POWERSAVINGS_BALANCE; 829 830 return SD_PREFER_SIBLING; 831 } 832 833 /* 834 * Optimise SD flags for power savings: 835 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings. 836 * Keep default SD flags if sched_{smt,mc}_power_saving=0 837 */ 838 839 static inline int sd_power_saving_flags(void) 840 { 841 if (sched_mc_power_savings | sched_smt_power_savings) 842 return SD_BALANCE_NEWIDLE; 843 844 return 0; 845 } 846 847 struct sched_group { 848 struct sched_group *next; /* Must be a circular list */ 849 850 /* 851 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 852 * single CPU. 853 */ 854 unsigned int cpu_power; 855 856 /* 857 * The CPUs this group covers. 858 * 859 * NOTE: this field is variable length. (Allocated dynamically 860 * by attaching extra space to the end of the structure, 861 * depending on how many CPUs the kernel has booted up with) 862 * 863 * It is also be embedded into static data structures at build 864 * time. (See 'struct static_sched_group' in kernel/sched.c) 865 */ 866 unsigned long cpumask[0]; 867 }; 868 869 static inline struct cpumask *sched_group_cpus(struct sched_group *sg) 870 { 871 return to_cpumask(sg->cpumask); 872 } 873 874 enum sched_domain_level { 875 SD_LV_NONE = 0, 876 SD_LV_SIBLING, 877 SD_LV_MC, 878 SD_LV_CPU, 879 SD_LV_NODE, 880 SD_LV_ALLNODES, 881 SD_LV_MAX 882 }; 883 884 struct sched_domain_attr { 885 int relax_domain_level; 886 }; 887 888 #define SD_ATTR_INIT (struct sched_domain_attr) { \ 889 .relax_domain_level = -1, \ 890 } 891 892 struct sched_domain { 893 /* These fields must be setup */ 894 struct sched_domain *parent; /* top domain must be null terminated */ 895 struct sched_domain *child; /* bottom domain must be null terminated */ 896 struct sched_group *groups; /* the balancing groups of the domain */ 897 unsigned long min_interval; /* Minimum balance interval ms */ 898 unsigned long max_interval; /* Maximum balance interval ms */ 899 unsigned int busy_factor; /* less balancing by factor if busy */ 900 unsigned int imbalance_pct; /* No balance until over watermark */ 901 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 902 unsigned int busy_idx; 903 unsigned int idle_idx; 904 unsigned int newidle_idx; 905 unsigned int wake_idx; 906 unsigned int forkexec_idx; 907 unsigned int smt_gain; 908 int flags; /* See SD_* */ 909 enum sched_domain_level level; 910 911 /* Runtime fields. */ 912 unsigned long last_balance; /* init to jiffies. units in jiffies */ 913 unsigned int balance_interval; /* initialise to 1. units in ms. */ 914 unsigned int nr_balance_failed; /* initialise to 0 */ 915 916 u64 last_update; 917 918 #ifdef CONFIG_SCHEDSTATS 919 /* load_balance() stats */ 920 unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 921 unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 922 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 923 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 924 unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 925 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 926 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 927 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 928 929 /* Active load balancing */ 930 unsigned int alb_count; 931 unsigned int alb_failed; 932 unsigned int alb_pushed; 933 934 /* SD_BALANCE_EXEC stats */ 935 unsigned int sbe_count; 936 unsigned int sbe_balanced; 937 unsigned int sbe_pushed; 938 939 /* SD_BALANCE_FORK stats */ 940 unsigned int sbf_count; 941 unsigned int sbf_balanced; 942 unsigned int sbf_pushed; 943 944 /* try_to_wake_up() stats */ 945 unsigned int ttwu_wake_remote; 946 unsigned int ttwu_move_affine; 947 unsigned int ttwu_move_balance; 948 #endif 949 #ifdef CONFIG_SCHED_DEBUG 950 char *name; 951 #endif 952 953 /* 954 * Span of all CPUs in this domain. 955 * 956 * NOTE: this field is variable length. (Allocated dynamically 957 * by attaching extra space to the end of the structure, 958 * depending on how many CPUs the kernel has booted up with) 959 * 960 * It is also be embedded into static data structures at build 961 * time. (See 'struct static_sched_domain' in kernel/sched.c) 962 */ 963 unsigned long span[0]; 964 }; 965 966 static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 967 { 968 return to_cpumask(sd->span); 969 } 970 971 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 972 struct sched_domain_attr *dattr_new); 973 974 /* Allocate an array of sched domains, for partition_sched_domains(). */ 975 cpumask_var_t *alloc_sched_domains(unsigned int ndoms); 976 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); 977 978 /* Test a flag in parent sched domain */ 979 static inline int test_sd_parent(struct sched_domain *sd, int flag) 980 { 981 if (sd->parent && (sd->parent->flags & flag)) 982 return 1; 983 984 return 0; 985 } 986 987 unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); 988 unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); 989 990 #else /* CONFIG_SMP */ 991 992 struct sched_domain_attr; 993 994 static inline void 995 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], 996 struct sched_domain_attr *dattr_new) 997 { 998 } 999 #endif /* !CONFIG_SMP */ 1000 1001 1002 struct io_context; /* See blkdev.h */ 1003 1004 1005 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 1006 extern void prefetch_stack(struct task_struct *t); 1007 #else 1008 static inline void prefetch_stack(struct task_struct *t) { } 1009 #endif 1010 1011 struct audit_context; /* See audit.c */ 1012 struct mempolicy; 1013 struct pipe_inode_info; 1014 struct uts_namespace; 1015 1016 struct rq; 1017 struct sched_domain; 1018 1019 /* 1020 * wake flags 1021 */ 1022 #define WF_SYNC 0x01 /* waker goes to sleep after wakup */ 1023 #define WF_FORK 0x02 /* child wakeup after fork */ 1024 1025 struct sched_class { 1026 const struct sched_class *next; 1027 1028 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup, 1029 bool head); 1030 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); 1031 void (*yield_task) (struct rq *rq); 1032 1033 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); 1034 1035 struct task_struct * (*pick_next_task) (struct rq *rq); 1036 void (*put_prev_task) (struct rq *rq, struct task_struct *p); 1037 1038 #ifdef CONFIG_SMP 1039 int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags); 1040 1041 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); 1042 void (*post_schedule) (struct rq *this_rq); 1043 void (*task_waking) (struct rq *this_rq, struct task_struct *task); 1044 void (*task_woken) (struct rq *this_rq, struct task_struct *task); 1045 1046 void (*set_cpus_allowed)(struct task_struct *p, 1047 const struct cpumask *newmask); 1048 1049 void (*rq_online)(struct rq *rq); 1050 void (*rq_offline)(struct rq *rq); 1051 #endif 1052 1053 void (*set_curr_task) (struct rq *rq); 1054 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 1055 void (*task_fork) (struct task_struct *p); 1056 1057 void (*switched_from) (struct rq *this_rq, struct task_struct *task, 1058 int running); 1059 void (*switched_to) (struct rq *this_rq, struct task_struct *task, 1060 int running); 1061 void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 1062 int oldprio, int running); 1063 1064 unsigned int (*get_rr_interval) (struct rq *rq, 1065 struct task_struct *task); 1066 1067 #ifdef CONFIG_FAIR_GROUP_SCHED 1068 void (*moved_group) (struct task_struct *p, int on_rq); 1069 #endif 1070 }; 1071 1072 struct load_weight { 1073 unsigned long weight, inv_weight; 1074 }; 1075 1076 /* 1077 * CFS stats for a schedulable entity (task, task-group etc) 1078 * 1079 * Current field usage histogram: 1080 * 1081 * 4 se->block_start 1082 * 4 se->run_node 1083 * 4 se->sleep_start 1084 * 6 se->load.weight 1085 */ 1086 struct sched_entity { 1087 struct load_weight load; /* for load-balancing */ 1088 struct rb_node run_node; 1089 struct list_head group_node; 1090 unsigned int on_rq; 1091 1092 u64 exec_start; 1093 u64 sum_exec_runtime; 1094 u64 vruntime; 1095 u64 prev_sum_exec_runtime; 1096 1097 u64 last_wakeup; 1098 u64 avg_overlap; 1099 1100 u64 nr_migrations; 1101 1102 u64 start_runtime; 1103 u64 avg_wakeup; 1104 1105 #ifdef CONFIG_SCHEDSTATS 1106 u64 wait_start; 1107 u64 wait_max; 1108 u64 wait_count; 1109 u64 wait_sum; 1110 u64 iowait_count; 1111 u64 iowait_sum; 1112 1113 u64 sleep_start; 1114 u64 sleep_max; 1115 s64 sum_sleep_runtime; 1116 1117 u64 block_start; 1118 u64 block_max; 1119 u64 exec_max; 1120 u64 slice_max; 1121 1122 u64 nr_migrations_cold; 1123 u64 nr_failed_migrations_affine; 1124 u64 nr_failed_migrations_running; 1125 u64 nr_failed_migrations_hot; 1126 u64 nr_forced_migrations; 1127 1128 u64 nr_wakeups; 1129 u64 nr_wakeups_sync; 1130 u64 nr_wakeups_migrate; 1131 u64 nr_wakeups_local; 1132 u64 nr_wakeups_remote; 1133 u64 nr_wakeups_affine; 1134 u64 nr_wakeups_affine_attempts; 1135 u64 nr_wakeups_passive; 1136 u64 nr_wakeups_idle; 1137 #endif 1138 1139 #ifdef CONFIG_FAIR_GROUP_SCHED 1140 struct sched_entity *parent; 1141 /* rq on which this entity is (to be) queued: */ 1142 struct cfs_rq *cfs_rq; 1143 /* rq "owned" by this entity/group: */ 1144 struct cfs_rq *my_q; 1145 #endif 1146 }; 1147 1148 struct sched_rt_entity { 1149 struct list_head run_list; 1150 unsigned long timeout; 1151 unsigned int time_slice; 1152 int nr_cpus_allowed; 1153 1154 struct sched_rt_entity *back; 1155 #ifdef CONFIG_RT_GROUP_SCHED 1156 struct sched_rt_entity *parent; 1157 /* rq on which this entity is (to be) queued: */ 1158 struct rt_rq *rt_rq; 1159 /* rq "owned" by this entity/group: */ 1160 struct rt_rq *my_q; 1161 #endif 1162 }; 1163 1164 struct rcu_node; 1165 1166 struct task_struct { 1167 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 1168 void *stack; 1169 atomic_t usage; 1170 unsigned int flags; /* per process flags, defined below */ 1171 unsigned int ptrace; 1172 1173 int lock_depth; /* BKL lock depth */ 1174 1175 #ifdef CONFIG_SMP 1176 #ifdef __ARCH_WANT_UNLOCKED_CTXSW 1177 int oncpu; 1178 #endif 1179 #endif 1180 1181 int prio, static_prio, normal_prio; 1182 unsigned int rt_priority; 1183 const struct sched_class *sched_class; 1184 struct sched_entity se; 1185 struct sched_rt_entity rt; 1186 1187 #ifdef CONFIG_PREEMPT_NOTIFIERS 1188 /* list of struct preempt_notifier: */ 1189 struct hlist_head preempt_notifiers; 1190 #endif 1191 1192 /* 1193 * fpu_counter contains the number of consecutive context switches 1194 * that the FPU is used. If this is over a threshold, the lazy fpu 1195 * saving becomes unlazy to save the trap. This is an unsigned char 1196 * so that after 256 times the counter wraps and the behavior turns 1197 * lazy again; this to deal with bursty apps that only use FPU for 1198 * a short time 1199 */ 1200 unsigned char fpu_counter; 1201 #ifdef CONFIG_BLK_DEV_IO_TRACE 1202 unsigned int btrace_seq; 1203 #endif 1204 1205 unsigned int policy; 1206 cpumask_t cpus_allowed; 1207 1208 #ifdef CONFIG_TREE_PREEMPT_RCU 1209 int rcu_read_lock_nesting; 1210 char rcu_read_unlock_special; 1211 struct rcu_node *rcu_blocked_node; 1212 struct list_head rcu_node_entry; 1213 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ 1214 1215 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 1216 struct sched_info sched_info; 1217 #endif 1218 1219 struct list_head tasks; 1220 struct plist_node pushable_tasks; 1221 1222 struct mm_struct *mm, *active_mm; 1223 #if defined(SPLIT_RSS_COUNTING) 1224 struct task_rss_stat rss_stat; 1225 #endif 1226 /* task state */ 1227 int exit_state; 1228 int exit_code, exit_signal; 1229 int pdeath_signal; /* The signal sent when the parent dies */ 1230 /* ??? */ 1231 unsigned int personality; 1232 unsigned did_exec:1; 1233 unsigned in_execve:1; /* Tell the LSMs that the process is doing an 1234 * execve */ 1235 unsigned in_iowait:1; 1236 1237 1238 /* Revert to default priority/policy when forking */ 1239 unsigned sched_reset_on_fork:1; 1240 1241 pid_t pid; 1242 pid_t tgid; 1243 1244 #ifdef CONFIG_CC_STACKPROTECTOR 1245 /* Canary value for the -fstack-protector gcc feature */ 1246 unsigned long stack_canary; 1247 #endif 1248 1249 /* 1250 * pointers to (original) parent process, youngest child, younger sibling, 1251 * older sibling, respectively. (p->father can be replaced with 1252 * p->real_parent->pid) 1253 */ 1254 struct task_struct *real_parent; /* real parent process */ 1255 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ 1256 /* 1257 * children/sibling forms the list of my natural children 1258 */ 1259 struct list_head children; /* list of my children */ 1260 struct list_head sibling; /* linkage in my parent's children list */ 1261 struct task_struct *group_leader; /* threadgroup leader */ 1262 1263 /* 1264 * ptraced is the list of tasks this task is using ptrace on. 1265 * This includes both natural children and PTRACE_ATTACH targets. 1266 * p->ptrace_entry is p's link on the p->parent->ptraced list. 1267 */ 1268 struct list_head ptraced; 1269 struct list_head ptrace_entry; 1270 1271 /* 1272 * This is the tracer handle for the ptrace BTS extension. 1273 * This field actually belongs to the ptracer task. 1274 */ 1275 struct bts_context *bts; 1276 1277 /* PID/PID hash table linkage. */ 1278 struct pid_link pids[PIDTYPE_MAX]; 1279 struct list_head thread_group; 1280 1281 struct completion *vfork_done; /* for vfork() */ 1282 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1283 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1284 1285 cputime_t utime, stime, utimescaled, stimescaled; 1286 cputime_t gtime; 1287 #ifndef CONFIG_VIRT_CPU_ACCOUNTING 1288 cputime_t prev_utime, prev_stime; 1289 #endif 1290 unsigned long nvcsw, nivcsw; /* context switch counts */ 1291 struct timespec start_time; /* monotonic time */ 1292 struct timespec real_start_time; /* boot based time */ 1293 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1294 unsigned long min_flt, maj_flt; 1295 1296 struct task_cputime cputime_expires; 1297 struct list_head cpu_timers[3]; 1298 1299 /* process credentials */ 1300 const struct cred *real_cred; /* objective and real subjective task 1301 * credentials (COW) */ 1302 const struct cred *cred; /* effective (overridable) subjective task 1303 * credentials (COW) */ 1304 struct mutex cred_guard_mutex; /* guard against foreign influences on 1305 * credential calculations 1306 * (notably. ptrace) */ 1307 struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */ 1308 1309 char comm[TASK_COMM_LEN]; /* executable name excluding path 1310 - access with [gs]et_task_comm (which lock 1311 it with task_lock()) 1312 - initialized normally by setup_new_exec */ 1313 /* file system info */ 1314 int link_count, total_link_count; 1315 #ifdef CONFIG_SYSVIPC 1316 /* ipc stuff */ 1317 struct sysv_sem sysvsem; 1318 #endif 1319 #ifdef CONFIG_DETECT_HUNG_TASK 1320 /* hung task detection */ 1321 unsigned long last_switch_count; 1322 #endif 1323 /* CPU-specific state of this task */ 1324 struct thread_struct thread; 1325 /* filesystem information */ 1326 struct fs_struct *fs; 1327 /* open file information */ 1328 struct files_struct *files; 1329 /* namespaces */ 1330 struct nsproxy *nsproxy; 1331 /* signal handlers */ 1332 struct signal_struct *signal; 1333 struct sighand_struct *sighand; 1334 1335 sigset_t blocked, real_blocked; 1336 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ 1337 struct sigpending pending; 1338 1339 unsigned long sas_ss_sp; 1340 size_t sas_ss_size; 1341 int (*notifier)(void *priv); 1342 void *notifier_data; 1343 sigset_t *notifier_mask; 1344 struct audit_context *audit_context; 1345 #ifdef CONFIG_AUDITSYSCALL 1346 uid_t loginuid; 1347 unsigned int sessionid; 1348 #endif 1349 seccomp_t seccomp; 1350 1351 /* Thread group tracking */ 1352 u32 parent_exec_id; 1353 u32 self_exec_id; 1354 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, 1355 * mempolicy */ 1356 spinlock_t alloc_lock; 1357 1358 #ifdef CONFIG_GENERIC_HARDIRQS 1359 /* IRQ handler threads */ 1360 struct irqaction *irqaction; 1361 #endif 1362 1363 /* Protection of the PI data structures: */ 1364 raw_spinlock_t pi_lock; 1365 1366 #ifdef CONFIG_RT_MUTEXES 1367 /* PI waiters blocked on a rt_mutex held by this task */ 1368 struct plist_head pi_waiters; 1369 /* Deadlock detection and priority inheritance handling */ 1370 struct rt_mutex_waiter *pi_blocked_on; 1371 #endif 1372 1373 #ifdef CONFIG_DEBUG_MUTEXES 1374 /* mutex deadlock detection */ 1375 struct mutex_waiter *blocked_on; 1376 #endif 1377 #ifdef CONFIG_TRACE_IRQFLAGS 1378 unsigned int irq_events; 1379 unsigned long hardirq_enable_ip; 1380 unsigned long hardirq_disable_ip; 1381 unsigned int hardirq_enable_event; 1382 unsigned int hardirq_disable_event; 1383 int hardirqs_enabled; 1384 int hardirq_context; 1385 unsigned long softirq_disable_ip; 1386 unsigned long softirq_enable_ip; 1387 unsigned int softirq_disable_event; 1388 unsigned int softirq_enable_event; 1389 int softirqs_enabled; 1390 int softirq_context; 1391 #endif 1392 #ifdef CONFIG_LOCKDEP 1393 # define MAX_LOCK_DEPTH 48UL 1394 u64 curr_chain_key; 1395 int lockdep_depth; 1396 unsigned int lockdep_recursion; 1397 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1398 gfp_t lockdep_reclaim_gfp; 1399 #endif 1400 1401 /* journalling filesystem info */ 1402 void *journal_info; 1403 1404 /* stacked block device info */ 1405 struct bio_list *bio_list; 1406 1407 /* VM state */ 1408 struct reclaim_state *reclaim_state; 1409 1410 struct backing_dev_info *backing_dev_info; 1411 1412 struct io_context *io_context; 1413 1414 unsigned long ptrace_message; 1415 siginfo_t *last_siginfo; /* For ptrace use. */ 1416 struct task_io_accounting ioac; 1417 #if defined(CONFIG_TASK_XACCT) 1418 u64 acct_rss_mem1; /* accumulated rss usage */ 1419 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1420 cputime_t acct_timexpd; /* stime + utime since last update */ 1421 #endif 1422 #ifdef CONFIG_CPUSETS 1423 nodemask_t mems_allowed; /* Protected by alloc_lock */ 1424 int cpuset_mem_spread_rotor; 1425 #endif 1426 #ifdef CONFIG_CGROUPS 1427 /* Control Group info protected by css_set_lock */ 1428 struct css_set *cgroups; 1429 /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1430 struct list_head cg_list; 1431 #endif 1432 #ifdef CONFIG_FUTEX 1433 struct robust_list_head __user *robust_list; 1434 #ifdef CONFIG_COMPAT 1435 struct compat_robust_list_head __user *compat_robust_list; 1436 #endif 1437 struct list_head pi_state_list; 1438 struct futex_pi_state *pi_state_cache; 1439 #endif 1440 #ifdef CONFIG_PERF_EVENTS 1441 struct perf_event_context *perf_event_ctxp; 1442 struct mutex perf_event_mutex; 1443 struct list_head perf_event_list; 1444 #endif 1445 #ifdef CONFIG_NUMA 1446 struct mempolicy *mempolicy; /* Protected by alloc_lock */ 1447 short il_next; 1448 #endif 1449 atomic_t fs_excl; /* holding fs exclusive resources */ 1450 struct rcu_head rcu; 1451 1452 /* 1453 * cache last used pipe for splice 1454 */ 1455 struct pipe_inode_info *splice_pipe; 1456 #ifdef CONFIG_TASK_DELAY_ACCT 1457 struct task_delay_info *delays; 1458 #endif 1459 #ifdef CONFIG_FAULT_INJECTION 1460 int make_it_fail; 1461 #endif 1462 struct prop_local_single dirties; 1463 #ifdef CONFIG_LATENCYTOP 1464 int latency_record_count; 1465 struct latency_record latency_record[LT_SAVECOUNT]; 1466 #endif 1467 /* 1468 * time slack values; these are used to round up poll() and 1469 * select() etc timeout values. These are in nanoseconds. 1470 */ 1471 unsigned long timer_slack_ns; 1472 unsigned long default_timer_slack_ns; 1473 1474 struct list_head *scm_work_list; 1475 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1476 /* Index of current stored adress in ret_stack */ 1477 int curr_ret_stack; 1478 /* Stack of return addresses for return function tracing */ 1479 struct ftrace_ret_stack *ret_stack; 1480 /* time stamp for last schedule */ 1481 unsigned long long ftrace_timestamp; 1482 /* 1483 * Number of functions that haven't been traced 1484 * because of depth overrun. 1485 */ 1486 atomic_t trace_overrun; 1487 /* Pause for the tracing */ 1488 atomic_t tracing_graph_pause; 1489 #endif 1490 #ifdef CONFIG_TRACING 1491 /* state flags for use by tracers */ 1492 unsigned long trace; 1493 /* bitmask of trace recursion */ 1494 unsigned long trace_recursion; 1495 #endif /* CONFIG_TRACING */ 1496 unsigned long stack_start; 1497 #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */ 1498 struct memcg_batch_info { 1499 int do_batch; /* incremented when batch uncharge started */ 1500 struct mem_cgroup *memcg; /* target memcg of uncharge */ 1501 unsigned long bytes; /* uncharged usage */ 1502 unsigned long memsw_bytes; /* uncharged mem+swap usage */ 1503 } memcg_batch; 1504 #endif 1505 }; 1506 1507 /* Future-safe accessor for struct task_struct's cpus_allowed. */ 1508 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) 1509 1510 /* 1511 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1512 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1513 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1514 * values are inverted: lower p->prio value means higher priority. 1515 * 1516 * The MAX_USER_RT_PRIO value allows the actual maximum 1517 * RT priority to be separate from the value exported to 1518 * user-space. This allows kernel threads to set their 1519 * priority to a value higher than any user task. Note: 1520 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1521 */ 1522 1523 #define MAX_USER_RT_PRIO 100 1524 #define MAX_RT_PRIO MAX_USER_RT_PRIO 1525 1526 #define MAX_PRIO (MAX_RT_PRIO + 40) 1527 #define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1528 1529 static inline int rt_prio(int prio) 1530 { 1531 if (unlikely(prio < MAX_RT_PRIO)) 1532 return 1; 1533 return 0; 1534 } 1535 1536 static inline int rt_task(struct task_struct *p) 1537 { 1538 return rt_prio(p->prio); 1539 } 1540 1541 static inline struct pid *task_pid(struct task_struct *task) 1542 { 1543 return task->pids[PIDTYPE_PID].pid; 1544 } 1545 1546 static inline struct pid *task_tgid(struct task_struct *task) 1547 { 1548 return task->group_leader->pids[PIDTYPE_PID].pid; 1549 } 1550 1551 /* 1552 * Without tasklist or rcu lock it is not safe to dereference 1553 * the result of task_pgrp/task_session even if task == current, 1554 * we can race with another thread doing sys_setsid/sys_setpgid. 1555 */ 1556 static inline struct pid *task_pgrp(struct task_struct *task) 1557 { 1558 return task->group_leader->pids[PIDTYPE_PGID].pid; 1559 } 1560 1561 static inline struct pid *task_session(struct task_struct *task) 1562 { 1563 return task->group_leader->pids[PIDTYPE_SID].pid; 1564 } 1565 1566 struct pid_namespace; 1567 1568 /* 1569 * the helpers to get the task's different pids as they are seen 1570 * from various namespaces 1571 * 1572 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1573 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 1574 * current. 1575 * task_xid_nr_ns() : id seen from the ns specified; 1576 * 1577 * set_task_vxid() : assigns a virtual id to a task; 1578 * 1579 * see also pid_nr() etc in include/linux/pid.h 1580 */ 1581 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, 1582 struct pid_namespace *ns); 1583 1584 static inline pid_t task_pid_nr(struct task_struct *tsk) 1585 { 1586 return tsk->pid; 1587 } 1588 1589 static inline pid_t task_pid_nr_ns(struct task_struct *tsk, 1590 struct pid_namespace *ns) 1591 { 1592 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); 1593 } 1594 1595 static inline pid_t task_pid_vnr(struct task_struct *tsk) 1596 { 1597 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); 1598 } 1599 1600 1601 static inline pid_t task_tgid_nr(struct task_struct *tsk) 1602 { 1603 return tsk->tgid; 1604 } 1605 1606 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 1607 1608 static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1609 { 1610 return pid_vnr(task_tgid(tsk)); 1611 } 1612 1613 1614 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, 1615 struct pid_namespace *ns) 1616 { 1617 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); 1618 } 1619 1620 static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1621 { 1622 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); 1623 } 1624 1625 1626 static inline pid_t task_session_nr_ns(struct task_struct *tsk, 1627 struct pid_namespace *ns) 1628 { 1629 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); 1630 } 1631 1632 static inline pid_t task_session_vnr(struct task_struct *tsk) 1633 { 1634 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); 1635 } 1636 1637 /* obsolete, do not use */ 1638 static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1639 { 1640 return task_pgrp_nr_ns(tsk, &init_pid_ns); 1641 } 1642 1643 /** 1644 * pid_alive - check that a task structure is not stale 1645 * @p: Task structure to be checked. 1646 * 1647 * Test if a process is not yet dead (at most zombie state) 1648 * If pid_alive fails, then pointers within the task structure 1649 * can be stale and must not be dereferenced. 1650 */ 1651 static inline int pid_alive(struct task_struct *p) 1652 { 1653 return p->pids[PIDTYPE_PID].pid != NULL; 1654 } 1655 1656 /** 1657 * is_global_init - check if a task structure is init 1658 * @tsk: Task structure to be checked. 1659 * 1660 * Check if a task structure is the first user space task the kernel created. 1661 */ 1662 static inline int is_global_init(struct task_struct *tsk) 1663 { 1664 return tsk->pid == 1; 1665 } 1666 1667 /* 1668 * is_container_init: 1669 * check whether in the task is init in its own pid namespace. 1670 */ 1671 extern int is_container_init(struct task_struct *tsk); 1672 1673 extern struct pid *cad_pid; 1674 1675 extern void free_task(struct task_struct *tsk); 1676 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1677 1678 extern void __put_task_struct(struct task_struct *t); 1679 1680 static inline void put_task_struct(struct task_struct *t) 1681 { 1682 if (atomic_dec_and_test(&t->usage)) 1683 __put_task_struct(t); 1684 } 1685 1686 extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st); 1687 extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st); 1688 1689 /* 1690 * Per process flags 1691 */ 1692 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 1693 /* Not implemented yet, only for 486*/ 1694 #define PF_STARTING 0x00000002 /* being created */ 1695 #define PF_EXITING 0x00000004 /* getting shut down */ 1696 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1697 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1698 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1699 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ 1700 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1701 #define PF_DUMPCORE 0x00000200 /* dumped core */ 1702 #define PF_SIGNALED 0x00000400 /* killed by a signal */ 1703 #define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1704 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 1705 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1706 #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */ 1707 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1708 #define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1709 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1710 #define PF_KSWAPD 0x00040000 /* I am kswapd */ 1711 #define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */ 1712 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1713 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ 1714 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1715 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1716 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1717 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1718 #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ 1719 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ 1720 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1721 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1722 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1723 #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ 1724 1725 /* 1726 * Only the _current_ task can read/write to tsk->flags, but other 1727 * tasks can access tsk->flags in readonly mode for example 1728 * with tsk_used_math (like during threaded core dumping). 1729 * There is however an exception to this rule during ptrace 1730 * or during fork: the ptracer task is allowed to write to the 1731 * child->flags of its traced child (same goes for fork, the parent 1732 * can write to the child->flags), because we're guaranteed the 1733 * child is not running and in turn not changing child->flags 1734 * at the same time the parent does it. 1735 */ 1736 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1737 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1738 #define clear_used_math() clear_stopped_child_used_math(current) 1739 #define set_used_math() set_stopped_child_used_math(current) 1740 #define conditional_stopped_child_used_math(condition, child) \ 1741 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1742 #define conditional_used_math(condition) \ 1743 conditional_stopped_child_used_math(condition, current) 1744 #define copy_to_stopped_child_used_math(child) \ 1745 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1746 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1747 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1748 #define used_math() tsk_used_math(current) 1749 1750 #ifdef CONFIG_TREE_PREEMPT_RCU 1751 1752 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ 1753 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ 1754 1755 static inline void rcu_copy_process(struct task_struct *p) 1756 { 1757 p->rcu_read_lock_nesting = 0; 1758 p->rcu_read_unlock_special = 0; 1759 p->rcu_blocked_node = NULL; 1760 INIT_LIST_HEAD(&p->rcu_node_entry); 1761 } 1762 1763 #else 1764 1765 static inline void rcu_copy_process(struct task_struct *p) 1766 { 1767 } 1768 1769 #endif 1770 1771 #ifdef CONFIG_SMP 1772 extern int set_cpus_allowed_ptr(struct task_struct *p, 1773 const struct cpumask *new_mask); 1774 #else 1775 static inline int set_cpus_allowed_ptr(struct task_struct *p, 1776 const struct cpumask *new_mask) 1777 { 1778 if (!cpumask_test_cpu(0, new_mask)) 1779 return -EINVAL; 1780 return 0; 1781 } 1782 #endif 1783 1784 #ifndef CONFIG_CPUMASK_OFFSTACK 1785 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1786 { 1787 return set_cpus_allowed_ptr(p, &new_mask); 1788 } 1789 #endif 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 /* ftrace calls sched_clock() directly */ 1802 extern unsigned long long notrace sched_clock(void); 1803 1804 extern void sched_clock_init(void); 1805 extern u64 sched_clock_cpu(int cpu); 1806 1807 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 1808 static inline void sched_clock_tick(void) 1809 { 1810 } 1811 1812 static inline void sched_clock_idle_sleep_event(void) 1813 { 1814 } 1815 1816 static inline void sched_clock_idle_wakeup_event(u64 delta_ns) 1817 { 1818 } 1819 #else 1820 extern void sched_clock_tick(void); 1821 extern void sched_clock_idle_sleep_event(void); 1822 extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1823 #endif 1824 1825 /* 1826 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1827 * clock constructed from sched_clock(): 1828 */ 1829 extern unsigned long long cpu_clock(int cpu); 1830 1831 extern unsigned long long 1832 task_sched_runtime(struct task_struct *task); 1833 extern unsigned long long thread_group_sched_runtime(struct task_struct *task); 1834 1835 /* sched_exec is called by processes performing an exec */ 1836 #ifdef CONFIG_SMP 1837 extern void sched_exec(void); 1838 #else 1839 #define sched_exec() {} 1840 #endif 1841 1842 extern void sched_clock_idle_sleep_event(void); 1843 extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1844 1845 #ifdef CONFIG_HOTPLUG_CPU 1846 extern void idle_task_exit(void); 1847 #else 1848 static inline void idle_task_exit(void) {} 1849 #endif 1850 1851 extern void sched_idle_next(void); 1852 1853 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) 1854 extern void wake_up_idle_cpu(int cpu); 1855 #else 1856 static inline void wake_up_idle_cpu(int cpu) { } 1857 #endif 1858 1859 extern unsigned int sysctl_sched_latency; 1860 extern unsigned int sysctl_sched_min_granularity; 1861 extern unsigned int sysctl_sched_wakeup_granularity; 1862 extern unsigned int sysctl_sched_shares_ratelimit; 1863 extern unsigned int sysctl_sched_shares_thresh; 1864 extern unsigned int sysctl_sched_child_runs_first; 1865 1866 enum sched_tunable_scaling { 1867 SCHED_TUNABLESCALING_NONE, 1868 SCHED_TUNABLESCALING_LOG, 1869 SCHED_TUNABLESCALING_LINEAR, 1870 SCHED_TUNABLESCALING_END, 1871 }; 1872 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; 1873 1874 #ifdef CONFIG_SCHED_DEBUG 1875 extern unsigned int sysctl_sched_migration_cost; 1876 extern unsigned int sysctl_sched_nr_migrate; 1877 extern unsigned int sysctl_sched_time_avg; 1878 extern unsigned int sysctl_timer_migration; 1879 1880 int sched_proc_update_handler(struct ctl_table *table, int write, 1881 void __user *buffer, size_t *length, 1882 loff_t *ppos); 1883 #endif 1884 #ifdef CONFIG_SCHED_DEBUG 1885 static inline unsigned int get_sysctl_timer_migration(void) 1886 { 1887 return sysctl_timer_migration; 1888 } 1889 #else 1890 static inline unsigned int get_sysctl_timer_migration(void) 1891 { 1892 return 1; 1893 } 1894 #endif 1895 extern unsigned int sysctl_sched_rt_period; 1896 extern int sysctl_sched_rt_runtime; 1897 1898 int sched_rt_handler(struct ctl_table *table, int write, 1899 void __user *buffer, size_t *lenp, 1900 loff_t *ppos); 1901 1902 extern unsigned int sysctl_sched_compat_yield; 1903 1904 #ifdef CONFIG_RT_MUTEXES 1905 extern int rt_mutex_getprio(struct task_struct *p); 1906 extern void rt_mutex_setprio(struct task_struct *p, int prio); 1907 extern void rt_mutex_adjust_pi(struct task_struct *p); 1908 #else 1909 static inline int rt_mutex_getprio(struct task_struct *p) 1910 { 1911 return p->normal_prio; 1912 } 1913 # define rt_mutex_adjust_pi(p) do { } while (0) 1914 #endif 1915 1916 extern void set_user_nice(struct task_struct *p, long nice); 1917 extern int task_prio(const struct task_struct *p); 1918 extern int task_nice(const struct task_struct *p); 1919 extern int can_nice(const struct task_struct *p, const int nice); 1920 extern int task_curr(const struct task_struct *p); 1921 extern int idle_cpu(int cpu); 1922 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1923 extern int sched_setscheduler_nocheck(struct task_struct *, int, 1924 struct sched_param *); 1925 extern struct task_struct *idle_task(int cpu); 1926 extern struct task_struct *curr_task(int cpu); 1927 extern void set_curr_task(int cpu, struct task_struct *p); 1928 1929 void yield(void); 1930 1931 /* 1932 * The default (Linux) execution domain. 1933 */ 1934 extern struct exec_domain default_exec_domain; 1935 1936 union thread_union { 1937 struct thread_info thread_info; 1938 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1939 }; 1940 1941 #ifndef __HAVE_ARCH_KSTACK_END 1942 static inline int kstack_end(void *addr) 1943 { 1944 /* Reliable end of stack detection: 1945 * Some APM bios versions misalign the stack 1946 */ 1947 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1948 } 1949 #endif 1950 1951 extern union thread_union init_thread_union; 1952 extern struct task_struct init_task; 1953 1954 extern struct mm_struct init_mm; 1955 1956 extern struct pid_namespace init_pid_ns; 1957 1958 /* 1959 * find a task by one of its numerical ids 1960 * 1961 * find_task_by_pid_ns(): 1962 * finds a task by its pid in the specified namespace 1963 * find_task_by_vpid(): 1964 * finds a task by its virtual pid 1965 * 1966 * see also find_vpid() etc in include/linux/pid.h 1967 */ 1968 1969 extern struct task_struct *find_task_by_vpid(pid_t nr); 1970 extern struct task_struct *find_task_by_pid_ns(pid_t nr, 1971 struct pid_namespace *ns); 1972 1973 extern void __set_special_pids(struct pid *pid); 1974 1975 /* per-UID process charging. */ 1976 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 1977 static inline struct user_struct *get_uid(struct user_struct *u) 1978 { 1979 atomic_inc(&u->__count); 1980 return u; 1981 } 1982 extern void free_uid(struct user_struct *); 1983 extern void release_uids(struct user_namespace *ns); 1984 1985 #include <asm/current.h> 1986 1987 extern void do_timer(unsigned long ticks); 1988 1989 extern int wake_up_state(struct task_struct *tsk, unsigned int state); 1990 extern int wake_up_process(struct task_struct *tsk); 1991 extern void wake_up_new_task(struct task_struct *tsk, 1992 unsigned long clone_flags); 1993 #ifdef CONFIG_SMP 1994 extern void kick_process(struct task_struct *tsk); 1995 #else 1996 static inline void kick_process(struct task_struct *tsk) { } 1997 #endif 1998 extern void sched_fork(struct task_struct *p, int clone_flags); 1999 extern void sched_dead(struct task_struct *p); 2000 2001 extern void proc_caches_init(void); 2002 extern void flush_signals(struct task_struct *); 2003 extern void __flush_signals(struct task_struct *); 2004 extern void ignore_signals(struct task_struct *); 2005 extern void flush_signal_handlers(struct task_struct *, int force_default); 2006 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 2007 2008 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 2009 { 2010 unsigned long flags; 2011 int ret; 2012 2013 spin_lock_irqsave(&tsk->sighand->siglock, flags); 2014 ret = dequeue_signal(tsk, mask, info); 2015 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 2016 2017 return ret; 2018 } 2019 2020 extern void block_all_signals(int (*notifier)(void *priv), void *priv, 2021 sigset_t *mask); 2022 extern void unblock_all_signals(void); 2023 extern void release_task(struct task_struct * p); 2024 extern int send_sig_info(int, struct siginfo *, struct task_struct *); 2025 extern int force_sigsegv(int, struct task_struct *); 2026 extern int force_sig_info(int, struct siginfo *, struct task_struct *); 2027 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 2028 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 2029 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 2030 extern int kill_pgrp(struct pid *pid, int sig, int priv); 2031 extern int kill_pid(struct pid *pid, int sig, int priv); 2032 extern int kill_proc_info(int, struct siginfo *, pid_t); 2033 extern int do_notify_parent(struct task_struct *, int); 2034 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); 2035 extern void force_sig(int, struct task_struct *); 2036 extern int send_sig(int, struct task_struct *, int); 2037 extern void zap_other_threads(struct task_struct *p); 2038 extern struct sigqueue *sigqueue_alloc(void); 2039 extern void sigqueue_free(struct sigqueue *); 2040 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); 2041 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 2042 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 2043 2044 static inline int kill_cad_pid(int sig, int priv) 2045 { 2046 return kill_pid(cad_pid, sig, priv); 2047 } 2048 2049 /* These can be the second arg to send_sig_info/send_group_sig_info. */ 2050 #define SEND_SIG_NOINFO ((struct siginfo *) 0) 2051 #define SEND_SIG_PRIV ((struct siginfo *) 1) 2052 #define SEND_SIG_FORCED ((struct siginfo *) 2) 2053 2054 /* 2055 * True if we are on the alternate signal stack. 2056 */ 2057 static inline int on_sig_stack(unsigned long sp) 2058 { 2059 #ifdef CONFIG_STACK_GROWSUP 2060 return sp >= current->sas_ss_sp && 2061 sp - current->sas_ss_sp < current->sas_ss_size; 2062 #else 2063 return sp > current->sas_ss_sp && 2064 sp - current->sas_ss_sp <= current->sas_ss_size; 2065 #endif 2066 } 2067 2068 static inline int sas_ss_flags(unsigned long sp) 2069 { 2070 return (current->sas_ss_size == 0 ? SS_DISABLE 2071 : on_sig_stack(sp) ? SS_ONSTACK : 0); 2072 } 2073 2074 /* 2075 * Routines for handling mm_structs 2076 */ 2077 extern struct mm_struct * mm_alloc(void); 2078 2079 /* mmdrop drops the mm and the page tables */ 2080 extern void __mmdrop(struct mm_struct *); 2081 static inline void mmdrop(struct mm_struct * mm) 2082 { 2083 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 2084 __mmdrop(mm); 2085 } 2086 2087 /* mmput gets rid of the mappings and all user-space */ 2088 extern void mmput(struct mm_struct *); 2089 /* Grab a reference to a task's mm, if it is not already going away */ 2090 extern struct mm_struct *get_task_mm(struct task_struct *task); 2091 /* Remove the current tasks stale references to the old mm_struct */ 2092 extern void mm_release(struct task_struct *, struct mm_struct *); 2093 /* Allocate a new mm structure and copy contents from tsk->mm */ 2094 extern struct mm_struct *dup_mm(struct task_struct *tsk); 2095 2096 extern int copy_thread(unsigned long, unsigned long, unsigned long, 2097 struct task_struct *, struct pt_regs *); 2098 extern void flush_thread(void); 2099 extern void exit_thread(void); 2100 2101 extern void exit_files(struct task_struct *); 2102 extern void __cleanup_signal(struct signal_struct *); 2103 extern void __cleanup_sighand(struct sighand_struct *); 2104 2105 extern void exit_itimers(struct signal_struct *); 2106 extern void flush_itimer_signals(void); 2107 2108 extern NORET_TYPE void do_group_exit(int); 2109 2110 extern void daemonize(const char *, ...); 2111 extern int allow_signal(int); 2112 extern int disallow_signal(int); 2113 2114 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 2115 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 2116 struct task_struct *fork_idle(int); 2117 2118 extern void set_task_comm(struct task_struct *tsk, char *from); 2119 extern char *get_task_comm(char *to, struct task_struct *tsk); 2120 2121 #ifdef CONFIG_SMP 2122 extern void wait_task_context_switch(struct task_struct *p); 2123 extern unsigned long wait_task_inactive(struct task_struct *, long match_state); 2124 #else 2125 static inline void wait_task_context_switch(struct task_struct *p) {} 2126 static inline unsigned long wait_task_inactive(struct task_struct *p, 2127 long match_state) 2128 { 2129 return 1; 2130 } 2131 #endif 2132 2133 #define next_task(p) \ 2134 list_entry_rcu((p)->tasks.next, struct task_struct, tasks) 2135 2136 #define for_each_process(p) \ 2137 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 2138 2139 extern bool current_is_single_threaded(void); 2140 2141 /* 2142 * Careful: do_each_thread/while_each_thread is a double loop so 2143 * 'break' will not work as expected - use goto instead. 2144 */ 2145 #define do_each_thread(g, t) \ 2146 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 2147 2148 #define while_each_thread(g, t) \ 2149 while ((t = next_thread(t)) != g) 2150 2151 /* de_thread depends on thread_group_leader not being a pid based check */ 2152 #define thread_group_leader(p) (p == p->group_leader) 2153 2154 /* Do to the insanities of de_thread it is possible for a process 2155 * to have the pid of the thread group leader without actually being 2156 * the thread group leader. For iteration through the pids in proc 2157 * all we care about is that we have a task with the appropriate 2158 * pid, we don't actually care if we have the right task. 2159 */ 2160 static inline int has_group_leader_pid(struct task_struct *p) 2161 { 2162 return p->pid == p->tgid; 2163 } 2164 2165 static inline 2166 int same_thread_group(struct task_struct *p1, struct task_struct *p2) 2167 { 2168 return p1->tgid == p2->tgid; 2169 } 2170 2171 static inline struct task_struct *next_thread(const struct task_struct *p) 2172 { 2173 return list_entry_rcu(p->thread_group.next, 2174 struct task_struct, thread_group); 2175 } 2176 2177 static inline int thread_group_empty(struct task_struct *p) 2178 { 2179 return list_empty(&p->thread_group); 2180 } 2181 2182 #define delay_group_leader(p) \ 2183 (thread_group_leader(p) && !thread_group_empty(p)) 2184 2185 static inline int task_detached(struct task_struct *p) 2186 { 2187 return p->exit_signal == -1; 2188 } 2189 2190 /* 2191 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 2192 * subscriptions and synchronises with wait4(). Also used in procfs. Also 2193 * pins the final release of task.io_context. Also protects ->cpuset and 2194 * ->cgroup.subsys[]. 2195 * 2196 * Nests both inside and outside of read_lock(&tasklist_lock). 2197 * It must not be nested with write_lock_irq(&tasklist_lock), 2198 * neither inside nor outside. 2199 */ 2200 static inline void task_lock(struct task_struct *p) 2201 { 2202 spin_lock(&p->alloc_lock); 2203 } 2204 2205 static inline void task_unlock(struct task_struct *p) 2206 { 2207 spin_unlock(&p->alloc_lock); 2208 } 2209 2210 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 2211 unsigned long *flags); 2212 2213 static inline void unlock_task_sighand(struct task_struct *tsk, 2214 unsigned long *flags) 2215 { 2216 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 2217 } 2218 2219 #ifndef __HAVE_THREAD_FUNCTIONS 2220 2221 #define task_thread_info(task) ((struct thread_info *)(task)->stack) 2222 #define task_stack_page(task) ((task)->stack) 2223 2224 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 2225 { 2226 *task_thread_info(p) = *task_thread_info(org); 2227 task_thread_info(p)->task = p; 2228 } 2229 2230 static inline unsigned long *end_of_stack(struct task_struct *p) 2231 { 2232 return (unsigned long *)(task_thread_info(p) + 1); 2233 } 2234 2235 #endif 2236 2237 static inline int object_is_on_stack(void *obj) 2238 { 2239 void *stack = task_stack_page(current); 2240 2241 return (obj >= stack) && (obj < (stack + THREAD_SIZE)); 2242 } 2243 2244 extern void thread_info_cache_init(void); 2245 2246 #ifdef CONFIG_DEBUG_STACK_USAGE 2247 static inline unsigned long stack_not_used(struct task_struct *p) 2248 { 2249 unsigned long *n = end_of_stack(p); 2250 2251 do { /* Skip over canary */ 2252 n++; 2253 } while (!*n); 2254 2255 return (unsigned long)n - (unsigned long)end_of_stack(p); 2256 } 2257 #endif 2258 2259 /* set thread flags in other task's structures 2260 * - see asm/thread_info.h for TIF_xxxx flags available 2261 */ 2262 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 2263 { 2264 set_ti_thread_flag(task_thread_info(tsk), flag); 2265 } 2266 2267 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2268 { 2269 clear_ti_thread_flag(task_thread_info(tsk), flag); 2270 } 2271 2272 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 2273 { 2274 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 2275 } 2276 2277 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 2278 { 2279 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 2280 } 2281 2282 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 2283 { 2284 return test_ti_thread_flag(task_thread_info(tsk), flag); 2285 } 2286 2287 static inline void set_tsk_need_resched(struct task_struct *tsk) 2288 { 2289 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2290 } 2291 2292 static inline void clear_tsk_need_resched(struct task_struct *tsk) 2293 { 2294 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 2295 } 2296 2297 static inline int test_tsk_need_resched(struct task_struct *tsk) 2298 { 2299 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); 2300 } 2301 2302 static inline int restart_syscall(void) 2303 { 2304 set_tsk_thread_flag(current, TIF_SIGPENDING); 2305 return -ERESTARTNOINTR; 2306 } 2307 2308 static inline int signal_pending(struct task_struct *p) 2309 { 2310 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 2311 } 2312 2313 static inline int __fatal_signal_pending(struct task_struct *p) 2314 { 2315 return unlikely(sigismember(&p->pending.signal, SIGKILL)); 2316 } 2317 2318 static inline int fatal_signal_pending(struct task_struct *p) 2319 { 2320 return signal_pending(p) && __fatal_signal_pending(p); 2321 } 2322 2323 static inline int signal_pending_state(long state, struct task_struct *p) 2324 { 2325 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) 2326 return 0; 2327 if (!signal_pending(p)) 2328 return 0; 2329 2330 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); 2331 } 2332 2333 static inline int need_resched(void) 2334 { 2335 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 2336 } 2337 2338 /* 2339 * cond_resched() and cond_resched_lock(): latency reduction via 2340 * explicit rescheduling in places that are safe. The return 2341 * value indicates whether a reschedule was done in fact. 2342 * cond_resched_lock() will drop the spinlock before scheduling, 2343 * cond_resched_softirq() will enable bhs before scheduling. 2344 */ 2345 extern int _cond_resched(void); 2346 2347 #define cond_resched() ({ \ 2348 __might_sleep(__FILE__, __LINE__, 0); \ 2349 _cond_resched(); \ 2350 }) 2351 2352 extern int __cond_resched_lock(spinlock_t *lock); 2353 2354 #ifdef CONFIG_PREEMPT 2355 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET 2356 #else 2357 #define PREEMPT_LOCK_OFFSET 0 2358 #endif 2359 2360 #define cond_resched_lock(lock) ({ \ 2361 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ 2362 __cond_resched_lock(lock); \ 2363 }) 2364 2365 extern int __cond_resched_softirq(void); 2366 2367 #define cond_resched_softirq() ({ \ 2368 __might_sleep(__FILE__, __LINE__, SOFTIRQ_OFFSET); \ 2369 __cond_resched_softirq(); \ 2370 }) 2371 2372 /* 2373 * Does a critical section need to be broken due to another 2374 * task waiting?: (technically does not depend on CONFIG_PREEMPT, 2375 * but a general need for low latency) 2376 */ 2377 static inline int spin_needbreak(spinlock_t *lock) 2378 { 2379 #ifdef CONFIG_PREEMPT 2380 return spin_is_contended(lock); 2381 #else 2382 return 0; 2383 #endif 2384 } 2385 2386 /* 2387 * Thread group CPU time accounting. 2388 */ 2389 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); 2390 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); 2391 2392 static inline void thread_group_cputime_init(struct signal_struct *sig) 2393 { 2394 sig->cputimer.cputime = INIT_CPUTIME; 2395 spin_lock_init(&sig->cputimer.lock); 2396 sig->cputimer.running = 0; 2397 } 2398 2399 static inline void thread_group_cputime_free(struct signal_struct *sig) 2400 { 2401 } 2402 2403 /* 2404 * Reevaluate whether the task has signals pending delivery. 2405 * Wake the task if so. 2406 * This is required every time the blocked sigset_t changes. 2407 * callers must hold sighand->siglock. 2408 */ 2409 extern void recalc_sigpending_and_wake(struct task_struct *t); 2410 extern void recalc_sigpending(void); 2411 2412 extern void signal_wake_up(struct task_struct *t, int resume_stopped); 2413 2414 /* 2415 * Wrappers for p->thread_info->cpu access. No-op on UP. 2416 */ 2417 #ifdef CONFIG_SMP 2418 2419 static inline unsigned int task_cpu(const struct task_struct *p) 2420 { 2421 return task_thread_info(p)->cpu; 2422 } 2423 2424 extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 2425 2426 #else 2427 2428 static inline unsigned int task_cpu(const struct task_struct *p) 2429 { 2430 return 0; 2431 } 2432 2433 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 2434 { 2435 } 2436 2437 #endif /* CONFIG_SMP */ 2438 2439 #ifdef CONFIG_TRACING 2440 extern void 2441 __trace_special(void *__tr, void *__data, 2442 unsigned long arg1, unsigned long arg2, unsigned long arg3); 2443 #else 2444 static inline void 2445 __trace_special(void *__tr, void *__data, 2446 unsigned long arg1, unsigned long arg2, unsigned long arg3) 2447 { 2448 } 2449 #endif 2450 2451 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); 2452 extern long sched_getaffinity(pid_t pid, struct cpumask *mask); 2453 2454 extern void normalize_rt_tasks(void); 2455 2456 #ifdef CONFIG_CGROUP_SCHED 2457 2458 extern struct task_group init_task_group; 2459 2460 extern struct task_group *sched_create_group(struct task_group *parent); 2461 extern void sched_destroy_group(struct task_group *tg); 2462 extern void sched_move_task(struct task_struct *tsk); 2463 #ifdef CONFIG_FAIR_GROUP_SCHED 2464 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 2465 extern unsigned long sched_group_shares(struct task_group *tg); 2466 #endif 2467 #ifdef CONFIG_RT_GROUP_SCHED 2468 extern int sched_group_set_rt_runtime(struct task_group *tg, 2469 long rt_runtime_us); 2470 extern long sched_group_rt_runtime(struct task_group *tg); 2471 extern int sched_group_set_rt_period(struct task_group *tg, 2472 long rt_period_us); 2473 extern long sched_group_rt_period(struct task_group *tg); 2474 extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); 2475 #endif 2476 #endif 2477 2478 extern int task_can_switch_user(struct user_struct *up, 2479 struct task_struct *tsk); 2480 2481 #ifdef CONFIG_TASK_XACCT 2482 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2483 { 2484 tsk->ioac.rchar += amt; 2485 } 2486 2487 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2488 { 2489 tsk->ioac.wchar += amt; 2490 } 2491 2492 static inline void inc_syscr(struct task_struct *tsk) 2493 { 2494 tsk->ioac.syscr++; 2495 } 2496 2497 static inline void inc_syscw(struct task_struct *tsk) 2498 { 2499 tsk->ioac.syscw++; 2500 } 2501 #else 2502 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 2503 { 2504 } 2505 2506 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 2507 { 2508 } 2509 2510 static inline void inc_syscr(struct task_struct *tsk) 2511 { 2512 } 2513 2514 static inline void inc_syscw(struct task_struct *tsk) 2515 { 2516 } 2517 #endif 2518 2519 #ifndef TASK_SIZE_OF 2520 #define TASK_SIZE_OF(tsk) TASK_SIZE 2521 #endif 2522 2523 /* 2524 * Call the function if the target task is executing on a CPU right now: 2525 */ 2526 extern void task_oncpu_function_call(struct task_struct *p, 2527 void (*func) (void *info), void *info); 2528 2529 2530 #ifdef CONFIG_MM_OWNER 2531 extern void mm_update_next_owner(struct mm_struct *mm); 2532 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); 2533 #else 2534 static inline void mm_update_next_owner(struct mm_struct *mm) 2535 { 2536 } 2537 2538 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) 2539 { 2540 } 2541 #endif /* CONFIG_MM_OWNER */ 2542 2543 static inline unsigned long task_rlimit(const struct task_struct *tsk, 2544 unsigned int limit) 2545 { 2546 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); 2547 } 2548 2549 static inline unsigned long task_rlimit_max(const struct task_struct *tsk, 2550 unsigned int limit) 2551 { 2552 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); 2553 } 2554 2555 static inline unsigned long rlimit(unsigned int limit) 2556 { 2557 return task_rlimit(current, limit); 2558 } 2559 2560 static inline unsigned long rlimit_max(unsigned int limit) 2561 { 2562 return task_rlimit_max(current, limit); 2563 } 2564 2565 #endif /* __KERNEL__ */ 2566 2567 #endif 2568