1 #ifndef _LINUX_SCHED_H 2 #define _LINUX_SCHED_H 3 4 #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */ 5 6 /* 7 * cloning flags: 8 */ 9 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ 10 #define CLONE_VM 0x00000100 /* set if VM shared between processes */ 11 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ 12 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ 13 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ 14 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ 15 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ 16 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ 17 #define CLONE_THREAD 0x00010000 /* Same thread group? */ 18 #define CLONE_NEWNS 0x00020000 /* New namespace group? */ 19 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ 20 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ 21 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ 22 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ 23 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ 24 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ 25 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ 26 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */ 27 #define CLONE_NEWUTS 0x04000000 /* New utsname group? */ 28 #define CLONE_NEWIPC 0x08000000 /* New ipcs */ 29 #define CLONE_NEWUSER 0x10000000 /* New user namespace */ 30 31 /* 32 * Scheduling policies 33 */ 34 #define SCHED_NORMAL 0 35 #define SCHED_FIFO 1 36 #define SCHED_RR 2 37 #define SCHED_BATCH 3 38 /* SCHED_ISO: reserved but not implemented yet */ 39 #define SCHED_IDLE 5 40 41 #ifdef __KERNEL__ 42 43 struct sched_param { 44 int sched_priority; 45 }; 46 47 #include <asm/param.h> /* for HZ */ 48 49 #include <linux/capability.h> 50 #include <linux/threads.h> 51 #include <linux/kernel.h> 52 #include <linux/types.h> 53 #include <linux/timex.h> 54 #include <linux/jiffies.h> 55 #include <linux/rbtree.h> 56 #include <linux/thread_info.h> 57 #include <linux/cpumask.h> 58 #include <linux/errno.h> 59 #include <linux/nodemask.h> 60 61 #include <asm/system.h> 62 #include <asm/semaphore.h> 63 #include <asm/page.h> 64 #include <asm/ptrace.h> 65 #include <asm/mmu.h> 66 #include <asm/cputime.h> 67 68 #include <linux/smp.h> 69 #include <linux/sem.h> 70 #include <linux/signal.h> 71 #include <linux/securebits.h> 72 #include <linux/fs_struct.h> 73 #include <linux/compiler.h> 74 #include <linux/completion.h> 75 #include <linux/pid.h> 76 #include <linux/percpu.h> 77 #include <linux/topology.h> 78 #include <linux/seccomp.h> 79 #include <linux/rcupdate.h> 80 #include <linux/futex.h> 81 #include <linux/rtmutex.h> 82 83 #include <linux/time.h> 84 #include <linux/param.h> 85 #include <linux/resource.h> 86 #include <linux/timer.h> 87 #include <linux/hrtimer.h> 88 #include <linux/task_io_accounting.h> 89 90 #include <asm/processor.h> 91 92 struct exec_domain; 93 struct futex_pi_state; 94 struct bio; 95 96 /* 97 * List of flags we want to share for kernel threads, 98 * if only because they are not used by them anyway. 99 */ 100 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 101 102 /* 103 * These are the constant used to fake the fixed-point load-average 104 * counting. Some notes: 105 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 106 * a load-average precision of 10 bits integer + 11 bits fractional 107 * - if you want to count load-averages more often, you need more 108 * precision, or rounding will get you. With 2-second counting freq, 109 * the EXP_n values would be 1981, 2034 and 2043 if still using only 110 * 11 bit fractions. 111 */ 112 extern unsigned long avenrun[]; /* Load averages */ 113 114 #define FSHIFT 11 /* nr of bits of precision */ 115 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 116 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */ 117 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 118 #define EXP_5 2014 /* 1/exp(5sec/5min) */ 119 #define EXP_15 2037 /* 1/exp(5sec/15min) */ 120 121 #define CALC_LOAD(load,exp,n) \ 122 load *= exp; \ 123 load += n*(FIXED_1-exp); \ 124 load >>= FSHIFT; 125 126 extern unsigned long total_forks; 127 extern int nr_threads; 128 DECLARE_PER_CPU(unsigned long, process_counts); 129 extern int nr_processes(void); 130 extern unsigned long nr_running(void); 131 extern unsigned long nr_uninterruptible(void); 132 extern unsigned long nr_active(void); 133 extern unsigned long nr_iowait(void); 134 extern unsigned long weighted_cpuload(const int cpu); 135 136 struct seq_file; 137 struct cfs_rq; 138 #ifdef CONFIG_SCHED_DEBUG 139 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 140 extern void proc_sched_set_task(struct task_struct *p); 141 extern void 142 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq, u64 now); 143 #else 144 static inline void 145 proc_sched_show_task(struct task_struct *p, struct seq_file *m) 146 { 147 } 148 static inline void proc_sched_set_task(struct task_struct *p) 149 { 150 } 151 static inline void 152 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq, u64 now) 153 { 154 } 155 #endif 156 157 /* 158 * Task state bitmask. NOTE! These bits are also 159 * encoded in fs/proc/array.c: get_task_state(). 160 * 161 * We have two separate sets of flags: task->state 162 * is about runnability, while task->exit_state are 163 * about the task exiting. Confusing, but this way 164 * modifying one set can't modify the other one by 165 * mistake. 166 */ 167 #define TASK_RUNNING 0 168 #define TASK_INTERRUPTIBLE 1 169 #define TASK_UNINTERRUPTIBLE 2 170 #define TASK_STOPPED 4 171 #define TASK_TRACED 8 172 /* in tsk->exit_state */ 173 #define EXIT_ZOMBIE 16 174 #define EXIT_DEAD 32 175 /* in tsk->state again */ 176 #define TASK_NONINTERACTIVE 64 177 #define TASK_DEAD 128 178 179 #define __set_task_state(tsk, state_value) \ 180 do { (tsk)->state = (state_value); } while (0) 181 #define set_task_state(tsk, state_value) \ 182 set_mb((tsk)->state, (state_value)) 183 184 /* 185 * set_current_state() includes a barrier so that the write of current->state 186 * is correctly serialised wrt the caller's subsequent test of whether to 187 * actually sleep: 188 * 189 * set_current_state(TASK_UNINTERRUPTIBLE); 190 * if (do_i_need_to_sleep()) 191 * schedule(); 192 * 193 * If the caller does not need such serialisation then use __set_current_state() 194 */ 195 #define __set_current_state(state_value) \ 196 do { current->state = (state_value); } while (0) 197 #define set_current_state(state_value) \ 198 set_mb(current->state, (state_value)) 199 200 /* Task command name length */ 201 #define TASK_COMM_LEN 16 202 203 #include <linux/spinlock.h> 204 205 /* 206 * This serializes "schedule()" and also protects 207 * the run-queue from deletions/modifications (but 208 * _adding_ to the beginning of the run-queue has 209 * a separate lock). 210 */ 211 extern rwlock_t tasklist_lock; 212 extern spinlock_t mmlist_lock; 213 214 struct task_struct; 215 216 extern void sched_init(void); 217 extern void sched_init_smp(void); 218 extern void init_idle(struct task_struct *idle, int cpu); 219 extern void init_idle_bootup_task(struct task_struct *idle); 220 221 extern cpumask_t nohz_cpu_mask; 222 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 223 extern int select_nohz_load_balancer(int cpu); 224 #else 225 static inline int select_nohz_load_balancer(int cpu) 226 { 227 return 0; 228 } 229 #endif 230 231 /* 232 * Only dump TASK_* tasks. (0 for all tasks) 233 */ 234 extern void show_state_filter(unsigned long state_filter); 235 236 static inline void show_state(void) 237 { 238 show_state_filter(0); 239 } 240 241 extern void show_regs(struct pt_regs *); 242 243 /* 244 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 245 * task), SP is the stack pointer of the first frame that should be shown in the back 246 * trace (or NULL if the entire call-chain of the task should be shown). 247 */ 248 extern void show_stack(struct task_struct *task, unsigned long *sp); 249 250 void io_schedule(void); 251 long io_schedule_timeout(long timeout); 252 253 extern void cpu_init (void); 254 extern void trap_init(void); 255 extern void update_process_times(int user); 256 extern void scheduler_tick(void); 257 258 #ifdef CONFIG_DETECT_SOFTLOCKUP 259 extern void softlockup_tick(void); 260 extern void spawn_softlockup_task(void); 261 extern void touch_softlockup_watchdog(void); 262 extern void touch_all_softlockup_watchdogs(void); 263 #else 264 static inline void softlockup_tick(void) 265 { 266 } 267 static inline void spawn_softlockup_task(void) 268 { 269 } 270 static inline void touch_softlockup_watchdog(void) 271 { 272 } 273 static inline void touch_all_softlockup_watchdogs(void) 274 { 275 } 276 #endif 277 278 279 /* Attach to any functions which should be ignored in wchan output. */ 280 #define __sched __attribute__((__section__(".sched.text"))) 281 /* Is this address in the __sched functions? */ 282 extern int in_sched_functions(unsigned long addr); 283 284 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 285 extern signed long FASTCALL(schedule_timeout(signed long timeout)); 286 extern signed long schedule_timeout_interruptible(signed long timeout); 287 extern signed long schedule_timeout_uninterruptible(signed long timeout); 288 asmlinkage void schedule(void); 289 290 struct nsproxy; 291 struct user_namespace; 292 293 /* Maximum number of active map areas.. This is a random (large) number */ 294 #define DEFAULT_MAX_MAP_COUNT 65536 295 296 extern int sysctl_max_map_count; 297 298 #include <linux/aio.h> 299 300 extern unsigned long 301 arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 302 unsigned long, unsigned long); 303 extern unsigned long 304 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 305 unsigned long len, unsigned long pgoff, 306 unsigned long flags); 307 extern void arch_unmap_area(struct mm_struct *, unsigned long); 308 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 309 310 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS 311 /* 312 * The mm counters are not protected by its page_table_lock, 313 * so must be incremented atomically. 314 */ 315 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) 316 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) 317 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) 318 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) 319 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) 320 typedef atomic_long_t mm_counter_t; 321 322 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 323 /* 324 * The mm counters are protected by its page_table_lock, 325 * so can be incremented directly. 326 */ 327 #define set_mm_counter(mm, member, value) (mm)->_##member = (value) 328 #define get_mm_counter(mm, member) ((mm)->_##member) 329 #define add_mm_counter(mm, member, value) (mm)->_##member += (value) 330 #define inc_mm_counter(mm, member) (mm)->_##member++ 331 #define dec_mm_counter(mm, member) (mm)->_##member-- 332 typedef unsigned long mm_counter_t; 333 334 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 335 336 #define get_mm_rss(mm) \ 337 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) 338 #define update_hiwater_rss(mm) do { \ 339 unsigned long _rss = get_mm_rss(mm); \ 340 if ((mm)->hiwater_rss < _rss) \ 341 (mm)->hiwater_rss = _rss; \ 342 } while (0) 343 #define update_hiwater_vm(mm) do { \ 344 if ((mm)->hiwater_vm < (mm)->total_vm) \ 345 (mm)->hiwater_vm = (mm)->total_vm; \ 346 } while (0) 347 348 extern void set_dumpable(struct mm_struct *mm, int value); 349 extern int get_dumpable(struct mm_struct *mm); 350 351 /* mm flags */ 352 /* dumpable bits */ 353 #define MMF_DUMPABLE 0 /* core dump is permitted */ 354 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 355 #define MMF_DUMPABLE_BITS 2 356 357 /* coredump filter bits */ 358 #define MMF_DUMP_ANON_PRIVATE 2 359 #define MMF_DUMP_ANON_SHARED 3 360 #define MMF_DUMP_MAPPED_PRIVATE 4 361 #define MMF_DUMP_MAPPED_SHARED 5 362 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 363 #define MMF_DUMP_FILTER_BITS 4 364 #define MMF_DUMP_FILTER_MASK \ 365 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 366 #define MMF_DUMP_FILTER_DEFAULT \ 367 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED)) 368 369 struct mm_struct { 370 struct vm_area_struct * mmap; /* list of VMAs */ 371 struct rb_root mm_rb; 372 struct vm_area_struct * mmap_cache; /* last find_vma result */ 373 unsigned long (*get_unmapped_area) (struct file *filp, 374 unsigned long addr, unsigned long len, 375 unsigned long pgoff, unsigned long flags); 376 void (*unmap_area) (struct mm_struct *mm, unsigned long addr); 377 unsigned long mmap_base; /* base of mmap area */ 378 unsigned long task_size; /* size of task vm space */ 379 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ 380 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ 381 pgd_t * pgd; 382 atomic_t mm_users; /* How many users with user space? */ 383 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ 384 int map_count; /* number of VMAs */ 385 struct rw_semaphore mmap_sem; 386 spinlock_t page_table_lock; /* Protects page tables and some counters */ 387 388 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung 389 * together off init_mm.mmlist, and are protected 390 * by mmlist_lock 391 */ 392 393 /* Special counters, in some configurations protected by the 394 * page_table_lock, in other configurations by being atomic. 395 */ 396 mm_counter_t _file_rss; 397 mm_counter_t _anon_rss; 398 399 unsigned long hiwater_rss; /* High-watermark of RSS usage */ 400 unsigned long hiwater_vm; /* High-water virtual memory usage */ 401 402 unsigned long total_vm, locked_vm, shared_vm, exec_vm; 403 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; 404 unsigned long start_code, end_code, start_data, end_data; 405 unsigned long start_brk, brk, start_stack; 406 unsigned long arg_start, arg_end, env_start, env_end; 407 408 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ 409 410 cpumask_t cpu_vm_mask; 411 412 /* Architecture-specific MM context */ 413 mm_context_t context; 414 415 /* Swap token stuff */ 416 /* 417 * Last value of global fault stamp as seen by this process. 418 * In other words, this value gives an indication of how long 419 * it has been since this task got the token. 420 * Look at mm/thrash.c 421 */ 422 unsigned int faultstamp; 423 unsigned int token_priority; 424 unsigned int last_interval; 425 426 unsigned long flags; /* Must use atomic bitops to access the bits */ 427 428 /* coredumping support */ 429 int core_waiters; 430 struct completion *core_startup_done, core_done; 431 432 /* aio bits */ 433 rwlock_t ioctx_list_lock; 434 struct kioctx *ioctx_list; 435 }; 436 437 struct sighand_struct { 438 atomic_t count; 439 struct k_sigaction action[_NSIG]; 440 spinlock_t siglock; 441 struct list_head signalfd_list; 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 /* 453 * NOTE! "signal_struct" does not have it's own 454 * locking, because a shared signal_struct always 455 * implies a shared sighand_struct, so locking 456 * sighand_struct is always a proper superset of 457 * the locking of signal_struct. 458 */ 459 struct signal_struct { 460 atomic_t count; 461 atomic_t live; 462 463 wait_queue_head_t wait_chldexit; /* for wait4() */ 464 465 /* current thread group signal load-balancing target: */ 466 struct task_struct *curr_target; 467 468 /* shared signal handling: */ 469 struct sigpending shared_pending; 470 471 /* thread group exit support */ 472 int group_exit_code; 473 /* overloaded: 474 * - notify group_exit_task when ->count is equal to notify_count 475 * - everyone except group_exit_task is stopped during signal delivery 476 * of fatal signals, group_exit_task processes the signal. 477 */ 478 struct task_struct *group_exit_task; 479 int notify_count; 480 481 /* thread group stop support, overloads group_exit_code too */ 482 int group_stop_count; 483 unsigned int flags; /* see SIGNAL_* flags below */ 484 485 /* POSIX.1b Interval Timers */ 486 struct list_head posix_timers; 487 488 /* ITIMER_REAL timer for the process */ 489 struct hrtimer real_timer; 490 struct task_struct *tsk; 491 ktime_t it_real_incr; 492 493 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 494 cputime_t it_prof_expires, it_virt_expires; 495 cputime_t it_prof_incr, it_virt_incr; 496 497 /* job control IDs */ 498 pid_t pgrp; 499 struct pid *tty_old_pgrp; 500 501 union { 502 pid_t session __deprecated; 503 pid_t __session; 504 }; 505 506 /* boolean value for session group leader */ 507 int leader; 508 509 struct tty_struct *tty; /* NULL if no tty */ 510 511 /* 512 * Cumulative resource counters for dead threads in the group, 513 * and for reaped dead child processes forked by this group. 514 * Live threads maintain their own counters and add to these 515 * in __exit_signal, except for the group leader. 516 */ 517 cputime_t utime, stime, cutime, cstime; 518 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 519 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 520 unsigned long inblock, oublock, cinblock, coublock; 521 522 /* 523 * Cumulative ns of scheduled CPU time for dead threads in the 524 * group, not including a zombie group leader. (This only differs 525 * from jiffies_to_ns(utime + stime) if sched_clock uses something 526 * other than jiffies.) 527 */ 528 unsigned long long sum_sched_runtime; 529 530 /* 531 * We don't bother to synchronize most readers of this at all, 532 * because there is no reader checking a limit that actually needs 533 * to get both rlim_cur and rlim_max atomically, and either one 534 * alone is a single word that can safely be read normally. 535 * getrlimit/setrlimit use task_lock(current->group_leader) to 536 * protect this instead of the siglock, because they really 537 * have no need to disable irqs. 538 */ 539 struct rlimit rlim[RLIM_NLIMITS]; 540 541 struct list_head cpu_timers[3]; 542 543 /* keep the process-shared keyrings here so that they do the right 544 * thing in threads created with CLONE_THREAD */ 545 #ifdef CONFIG_KEYS 546 struct key *session_keyring; /* keyring inherited over fork */ 547 struct key *process_keyring; /* keyring private to this process */ 548 #endif 549 #ifdef CONFIG_BSD_PROCESS_ACCT 550 struct pacct_struct pacct; /* per-process accounting information */ 551 #endif 552 #ifdef CONFIG_TASKSTATS 553 struct taskstats *stats; 554 #endif 555 #ifdef CONFIG_AUDIT 556 unsigned audit_tty; 557 struct tty_audit_buf *tty_audit_buf; 558 #endif 559 }; 560 561 /* Context switch must be unlocked if interrupts are to be enabled */ 562 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 563 # define __ARCH_WANT_UNLOCKED_CTXSW 564 #endif 565 566 /* 567 * Bits in flags field of signal_struct. 568 */ 569 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 570 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 571 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 572 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 573 574 /* 575 * Some day this will be a full-fledged user tracking system.. 576 */ 577 struct user_struct { 578 atomic_t __count; /* reference count */ 579 atomic_t processes; /* How many processes does this user have? */ 580 atomic_t files; /* How many open files does this user have? */ 581 atomic_t sigpending; /* How many pending signals does this user have? */ 582 #ifdef CONFIG_INOTIFY_USER 583 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 584 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 585 #endif 586 /* protected by mq_lock */ 587 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 588 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 589 590 #ifdef CONFIG_KEYS 591 struct key *uid_keyring; /* UID specific keyring */ 592 struct key *session_keyring; /* UID's default session keyring */ 593 #endif 594 595 /* Hash table maintenance information */ 596 struct list_head uidhash_list; 597 uid_t uid; 598 }; 599 600 extern struct user_struct *find_user(uid_t); 601 602 extern struct user_struct root_user; 603 #define INIT_USER (&root_user) 604 605 struct backing_dev_info; 606 struct reclaim_state; 607 608 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 609 struct sched_info { 610 /* cumulative counters */ 611 unsigned long pcnt; /* # of times run on this cpu */ 612 unsigned long long cpu_time, /* time spent on the cpu */ 613 run_delay; /* time spent waiting on a runqueue */ 614 615 /* timestamps */ 616 unsigned long long last_arrival,/* when we last ran on a cpu */ 617 last_queued; /* when we were last queued to run */ 618 }; 619 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 620 621 #ifdef CONFIG_SCHEDSTATS 622 extern const struct file_operations proc_schedstat_operations; 623 #endif /* CONFIG_SCHEDSTATS */ 624 625 #ifdef CONFIG_TASK_DELAY_ACCT 626 struct task_delay_info { 627 spinlock_t lock; 628 unsigned int flags; /* Private per-task flags */ 629 630 /* For each stat XXX, add following, aligned appropriately 631 * 632 * struct timespec XXX_start, XXX_end; 633 * u64 XXX_delay; 634 * u32 XXX_count; 635 * 636 * Atomicity of updates to XXX_delay, XXX_count protected by 637 * single lock above (split into XXX_lock if contention is an issue). 638 */ 639 640 /* 641 * XXX_count is incremented on every XXX operation, the delay 642 * associated with the operation is added to XXX_delay. 643 * XXX_delay contains the accumulated delay time in nanoseconds. 644 */ 645 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 646 u64 blkio_delay; /* wait for sync block io completion */ 647 u64 swapin_delay; /* wait for swapin block io completion */ 648 u32 blkio_count; /* total count of the number of sync block */ 649 /* io operations performed */ 650 u32 swapin_count; /* total count of the number of swapin block */ 651 /* io operations performed */ 652 }; 653 #endif /* CONFIG_TASK_DELAY_ACCT */ 654 655 static inline int sched_info_on(void) 656 { 657 #ifdef CONFIG_SCHEDSTATS 658 return 1; 659 #elif defined(CONFIG_TASK_DELAY_ACCT) 660 extern int delayacct_on; 661 return delayacct_on; 662 #else 663 return 0; 664 #endif 665 } 666 667 enum cpu_idle_type { 668 CPU_IDLE, 669 CPU_NOT_IDLE, 670 CPU_NEWLY_IDLE, 671 CPU_MAX_IDLE_TYPES 672 }; 673 674 /* 675 * sched-domains (multiprocessor balancing) declarations: 676 */ 677 678 /* 679 * Increase resolution of nice-level calculations: 680 */ 681 #define SCHED_LOAD_SHIFT 10 682 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 683 684 #define SCHED_LOAD_SCALE_FUZZ (SCHED_LOAD_SCALE >> 1) 685 686 #ifdef CONFIG_SMP 687 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 688 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 689 #define SD_BALANCE_EXEC 4 /* Balance on exec */ 690 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 691 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 692 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 693 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 694 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 695 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ 696 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ 697 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */ 698 699 #define BALANCE_FOR_MC_POWER \ 700 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0) 701 702 #define BALANCE_FOR_PKG_POWER \ 703 ((sched_mc_power_savings || sched_smt_power_savings) ? \ 704 SD_POWERSAVINGS_BALANCE : 0) 705 706 #define test_sd_parent(sd, flag) ((sd->parent && \ 707 (sd->parent->flags & flag)) ? 1 : 0) 708 709 710 struct sched_group { 711 struct sched_group *next; /* Must be a circular list */ 712 cpumask_t cpumask; 713 714 /* 715 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 716 * single CPU. This is read only (except for setup, hotplug CPU). 717 * Note : Never change cpu_power without recompute its reciprocal 718 */ 719 unsigned int __cpu_power; 720 /* 721 * reciprocal value of cpu_power to avoid expensive divides 722 * (see include/linux/reciprocal_div.h) 723 */ 724 u32 reciprocal_cpu_power; 725 }; 726 727 struct sched_domain { 728 /* These fields must be setup */ 729 struct sched_domain *parent; /* top domain must be null terminated */ 730 struct sched_domain *child; /* bottom domain must be null terminated */ 731 struct sched_group *groups; /* the balancing groups of the domain */ 732 cpumask_t span; /* span of all CPUs in this domain */ 733 unsigned long min_interval; /* Minimum balance interval ms */ 734 unsigned long max_interval; /* Maximum balance interval ms */ 735 unsigned int busy_factor; /* less balancing by factor if busy */ 736 unsigned int imbalance_pct; /* No balance until over watermark */ 737 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */ 738 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 739 unsigned int busy_idx; 740 unsigned int idle_idx; 741 unsigned int newidle_idx; 742 unsigned int wake_idx; 743 unsigned int forkexec_idx; 744 int flags; /* See SD_* */ 745 746 /* Runtime fields. */ 747 unsigned long last_balance; /* init to jiffies. units in jiffies */ 748 unsigned int balance_interval; /* initialise to 1. units in ms. */ 749 unsigned int nr_balance_failed; /* initialise to 0 */ 750 751 #ifdef CONFIG_SCHEDSTATS 752 /* load_balance() stats */ 753 unsigned long lb_cnt[CPU_MAX_IDLE_TYPES]; 754 unsigned long lb_failed[CPU_MAX_IDLE_TYPES]; 755 unsigned long lb_balanced[CPU_MAX_IDLE_TYPES]; 756 unsigned long lb_imbalance[CPU_MAX_IDLE_TYPES]; 757 unsigned long lb_gained[CPU_MAX_IDLE_TYPES]; 758 unsigned long lb_hot_gained[CPU_MAX_IDLE_TYPES]; 759 unsigned long lb_nobusyg[CPU_MAX_IDLE_TYPES]; 760 unsigned long lb_nobusyq[CPU_MAX_IDLE_TYPES]; 761 762 /* Active load balancing */ 763 unsigned long alb_cnt; 764 unsigned long alb_failed; 765 unsigned long alb_pushed; 766 767 /* SD_BALANCE_EXEC stats */ 768 unsigned long sbe_cnt; 769 unsigned long sbe_balanced; 770 unsigned long sbe_pushed; 771 772 /* SD_BALANCE_FORK stats */ 773 unsigned long sbf_cnt; 774 unsigned long sbf_balanced; 775 unsigned long sbf_pushed; 776 777 /* try_to_wake_up() stats */ 778 unsigned long ttwu_wake_remote; 779 unsigned long ttwu_move_affine; 780 unsigned long ttwu_move_balance; 781 #endif 782 }; 783 784 extern int partition_sched_domains(cpumask_t *partition1, 785 cpumask_t *partition2); 786 787 #endif /* CONFIG_SMP */ 788 789 /* 790 * A runqueue laden with a single nice 0 task scores a weighted_cpuload of 791 * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a 792 * task of nice 0 or enough lower priority tasks to bring up the 793 * weighted_cpuload 794 */ 795 static inline int above_background_load(void) 796 { 797 unsigned long cpu; 798 799 for_each_online_cpu(cpu) { 800 if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE) 801 return 1; 802 } 803 return 0; 804 } 805 806 struct io_context; /* See blkdev.h */ 807 struct cpuset; 808 809 #define NGROUPS_SMALL 32 810 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) 811 struct group_info { 812 int ngroups; 813 atomic_t usage; 814 gid_t small_block[NGROUPS_SMALL]; 815 int nblocks; 816 gid_t *blocks[0]; 817 }; 818 819 /* 820 * get_group_info() must be called with the owning task locked (via task_lock()) 821 * when task != current. The reason being that the vast majority of callers are 822 * looking at current->group_info, which can not be changed except by the 823 * current task. Changing current->group_info requires the task lock, too. 824 */ 825 #define get_group_info(group_info) do { \ 826 atomic_inc(&(group_info)->usage); \ 827 } while (0) 828 829 #define put_group_info(group_info) do { \ 830 if (atomic_dec_and_test(&(group_info)->usage)) \ 831 groups_free(group_info); \ 832 } while (0) 833 834 extern struct group_info *groups_alloc(int gidsetsize); 835 extern void groups_free(struct group_info *group_info); 836 extern int set_current_groups(struct group_info *group_info); 837 extern int groups_search(struct group_info *group_info, gid_t grp); 838 /* access the groups "array" with this macro */ 839 #define GROUP_AT(gi, i) \ 840 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) 841 842 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 843 extern void prefetch_stack(struct task_struct *t); 844 #else 845 static inline void prefetch_stack(struct task_struct *t) { } 846 #endif 847 848 struct audit_context; /* See audit.c */ 849 struct mempolicy; 850 struct pipe_inode_info; 851 struct uts_namespace; 852 853 struct rq; 854 struct sched_domain; 855 856 struct sched_class { 857 struct sched_class *next; 858 859 void (*enqueue_task) (struct rq *rq, struct task_struct *p, 860 int wakeup, u64 now); 861 void (*dequeue_task) (struct rq *rq, struct task_struct *p, 862 int sleep, u64 now); 863 void (*yield_task) (struct rq *rq, struct task_struct *p); 864 865 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p); 866 867 struct task_struct * (*pick_next_task) (struct rq *rq, u64 now); 868 void (*put_prev_task) (struct rq *rq, struct task_struct *p, u64 now); 869 870 int (*load_balance) (struct rq *this_rq, int this_cpu, 871 struct rq *busiest, 872 unsigned long max_nr_move, unsigned long max_load_move, 873 struct sched_domain *sd, enum cpu_idle_type idle, 874 int *all_pinned, unsigned long *total_load_moved); 875 876 void (*set_curr_task) (struct rq *rq); 877 void (*task_tick) (struct rq *rq, struct task_struct *p); 878 void (*task_new) (struct rq *rq, struct task_struct *p); 879 }; 880 881 struct load_weight { 882 unsigned long weight, inv_weight; 883 }; 884 885 /* 886 * CFS stats for a schedulable entity (task, task-group etc) 887 * 888 * Current field usage histogram: 889 * 890 * 4 se->block_start 891 * 4 se->run_node 892 * 4 se->sleep_start 893 * 4 se->sleep_start_fair 894 * 6 se->load.weight 895 * 7 se->delta_fair 896 * 15 se->wait_runtime 897 */ 898 struct sched_entity { 899 long wait_runtime; 900 unsigned long delta_fair_run; 901 unsigned long delta_fair_sleep; 902 unsigned long delta_exec; 903 s64 fair_key; 904 struct load_weight load; /* for load-balancing */ 905 struct rb_node run_node; 906 unsigned int on_rq; 907 908 u64 wait_start_fair; 909 u64 wait_start; 910 u64 exec_start; 911 u64 sleep_start; 912 u64 sleep_start_fair; 913 u64 block_start; 914 u64 sleep_max; 915 u64 block_max; 916 u64 exec_max; 917 u64 wait_max; 918 u64 last_ran; 919 920 u64 sum_exec_runtime; 921 s64 sum_wait_runtime; 922 s64 sum_sleep_runtime; 923 unsigned long wait_runtime_overruns; 924 unsigned long wait_runtime_underruns; 925 #ifdef CONFIG_FAIR_GROUP_SCHED 926 struct sched_entity *parent; 927 /* rq on which this entity is (to be) queued: */ 928 struct cfs_rq *cfs_rq; 929 /* rq "owned" by this entity/group: */ 930 struct cfs_rq *my_q; 931 #endif 932 }; 933 934 struct task_struct { 935 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 936 void *stack; 937 atomic_t usage; 938 unsigned int flags; /* per process flags, defined below */ 939 unsigned int ptrace; 940 941 int lock_depth; /* BKL lock depth */ 942 943 #ifdef CONFIG_SMP 944 #ifdef __ARCH_WANT_UNLOCKED_CTXSW 945 int oncpu; 946 #endif 947 #endif 948 949 int prio, static_prio, normal_prio; 950 struct list_head run_list; 951 struct sched_class *sched_class; 952 struct sched_entity se; 953 954 #ifdef CONFIG_PREEMPT_NOTIFIERS 955 /* list of struct preempt_notifier: */ 956 struct hlist_head preempt_notifiers; 957 #endif 958 959 unsigned short ioprio; 960 #ifdef CONFIG_BLK_DEV_IO_TRACE 961 unsigned int btrace_seq; 962 #endif 963 964 unsigned int policy; 965 cpumask_t cpus_allowed; 966 unsigned int time_slice; 967 968 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 969 struct sched_info sched_info; 970 #endif 971 972 struct list_head tasks; 973 /* 974 * ptrace_list/ptrace_children forms the list of my children 975 * that were stolen by a ptracer. 976 */ 977 struct list_head ptrace_children; 978 struct list_head ptrace_list; 979 980 struct mm_struct *mm, *active_mm; 981 982 /* task state */ 983 struct linux_binfmt *binfmt; 984 int exit_state; 985 int exit_code, exit_signal; 986 int pdeath_signal; /* The signal sent when the parent dies */ 987 /* ??? */ 988 unsigned int personality; 989 unsigned did_exec:1; 990 pid_t pid; 991 pid_t tgid; 992 993 #ifdef CONFIG_CC_STACKPROTECTOR 994 /* Canary value for the -fstack-protector gcc feature */ 995 unsigned long stack_canary; 996 #endif 997 /* 998 * pointers to (original) parent process, youngest child, younger sibling, 999 * older sibling, respectively. (p->father can be replaced with 1000 * p->parent->pid) 1001 */ 1002 struct task_struct *real_parent; /* real parent process (when being debugged) */ 1003 struct task_struct *parent; /* parent process */ 1004 /* 1005 * children/sibling forms the list of my children plus the 1006 * tasks I'm ptracing. 1007 */ 1008 struct list_head children; /* list of my children */ 1009 struct list_head sibling; /* linkage in my parent's children list */ 1010 struct task_struct *group_leader; /* threadgroup leader */ 1011 1012 /* PID/PID hash table linkage. */ 1013 struct pid_link pids[PIDTYPE_MAX]; 1014 struct list_head thread_group; 1015 1016 struct completion *vfork_done; /* for vfork() */ 1017 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 1018 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 1019 1020 unsigned int rt_priority; 1021 cputime_t utime, stime; 1022 unsigned long nvcsw, nivcsw; /* context switch counts */ 1023 struct timespec start_time; /* monotonic time */ 1024 struct timespec real_start_time; /* boot based time */ 1025 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 1026 unsigned long min_flt, maj_flt; 1027 1028 cputime_t it_prof_expires, it_virt_expires; 1029 unsigned long long it_sched_expires; 1030 struct list_head cpu_timers[3]; 1031 1032 /* process credentials */ 1033 uid_t uid,euid,suid,fsuid; 1034 gid_t gid,egid,sgid,fsgid; 1035 struct group_info *group_info; 1036 kernel_cap_t cap_effective, cap_inheritable, cap_permitted; 1037 unsigned keep_capabilities:1; 1038 struct user_struct *user; 1039 #ifdef CONFIG_KEYS 1040 struct key *request_key_auth; /* assumed request_key authority */ 1041 struct key *thread_keyring; /* keyring private to this thread */ 1042 unsigned char jit_keyring; /* default keyring to attach requested keys to */ 1043 #endif 1044 /* 1045 * fpu_counter contains the number of consecutive context switches 1046 * that the FPU is used. If this is over a threshold, the lazy fpu 1047 * saving becomes unlazy to save the trap. This is an unsigned char 1048 * so that after 256 times the counter wraps and the behavior turns 1049 * lazy again; this to deal with bursty apps that only use FPU for 1050 * a short time 1051 */ 1052 unsigned char fpu_counter; 1053 int oomkilladj; /* OOM kill score adjustment (bit shift). */ 1054 char comm[TASK_COMM_LEN]; /* executable name excluding path 1055 - access with [gs]et_task_comm (which lock 1056 it with task_lock()) 1057 - initialized normally by flush_old_exec */ 1058 /* file system info */ 1059 int link_count, total_link_count; 1060 #ifdef CONFIG_SYSVIPC 1061 /* ipc stuff */ 1062 struct sysv_sem sysvsem; 1063 #endif 1064 /* CPU-specific state of this task */ 1065 struct thread_struct thread; 1066 /* filesystem information */ 1067 struct fs_struct *fs; 1068 /* open file information */ 1069 struct files_struct *files; 1070 /* namespaces */ 1071 struct nsproxy *nsproxy; 1072 /* signal handlers */ 1073 struct signal_struct *signal; 1074 struct sighand_struct *sighand; 1075 1076 sigset_t blocked, real_blocked; 1077 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */ 1078 struct sigpending pending; 1079 1080 unsigned long sas_ss_sp; 1081 size_t sas_ss_size; 1082 int (*notifier)(void *priv); 1083 void *notifier_data; 1084 sigset_t *notifier_mask; 1085 1086 void *security; 1087 struct audit_context *audit_context; 1088 seccomp_t seccomp; 1089 1090 /* Thread group tracking */ 1091 u32 parent_exec_id; 1092 u32 self_exec_id; 1093 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 1094 spinlock_t alloc_lock; 1095 1096 /* Protection of the PI data structures: */ 1097 spinlock_t pi_lock; 1098 1099 #ifdef CONFIG_RT_MUTEXES 1100 /* PI waiters blocked on a rt_mutex held by this task */ 1101 struct plist_head pi_waiters; 1102 /* Deadlock detection and priority inheritance handling */ 1103 struct rt_mutex_waiter *pi_blocked_on; 1104 #endif 1105 1106 #ifdef CONFIG_DEBUG_MUTEXES 1107 /* mutex deadlock detection */ 1108 struct mutex_waiter *blocked_on; 1109 #endif 1110 #ifdef CONFIG_TRACE_IRQFLAGS 1111 unsigned int irq_events; 1112 int hardirqs_enabled; 1113 unsigned long hardirq_enable_ip; 1114 unsigned int hardirq_enable_event; 1115 unsigned long hardirq_disable_ip; 1116 unsigned int hardirq_disable_event; 1117 int softirqs_enabled; 1118 unsigned long softirq_disable_ip; 1119 unsigned int softirq_disable_event; 1120 unsigned long softirq_enable_ip; 1121 unsigned int softirq_enable_event; 1122 int hardirq_context; 1123 int softirq_context; 1124 #endif 1125 #ifdef CONFIG_LOCKDEP 1126 # define MAX_LOCK_DEPTH 30UL 1127 u64 curr_chain_key; 1128 int lockdep_depth; 1129 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1130 unsigned int lockdep_recursion; 1131 #endif 1132 1133 /* journalling filesystem info */ 1134 void *journal_info; 1135 1136 /* stacked block device info */ 1137 struct bio *bio_list, **bio_tail; 1138 1139 /* VM state */ 1140 struct reclaim_state *reclaim_state; 1141 1142 struct backing_dev_info *backing_dev_info; 1143 1144 struct io_context *io_context; 1145 1146 unsigned long ptrace_message; 1147 siginfo_t *last_siginfo; /* For ptrace use. */ 1148 /* 1149 * current io wait handle: wait queue entry to use for io waits 1150 * If this thread is processing aio, this points at the waitqueue 1151 * inside the currently handled kiocb. It may be NULL (i.e. default 1152 * to a stack based synchronous wait) if its doing sync IO. 1153 */ 1154 wait_queue_t *io_wait; 1155 #ifdef CONFIG_TASK_XACCT 1156 /* i/o counters(bytes read/written, #syscalls */ 1157 u64 rchar, wchar, syscr, syscw; 1158 #endif 1159 struct task_io_accounting ioac; 1160 #if defined(CONFIG_TASK_XACCT) 1161 u64 acct_rss_mem1; /* accumulated rss usage */ 1162 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 1163 cputime_t acct_stimexpd;/* stime since last update */ 1164 #endif 1165 #ifdef CONFIG_NUMA 1166 struct mempolicy *mempolicy; 1167 short il_next; 1168 #endif 1169 #ifdef CONFIG_CPUSETS 1170 struct cpuset *cpuset; 1171 nodemask_t mems_allowed; 1172 int cpuset_mems_generation; 1173 int cpuset_mem_spread_rotor; 1174 #endif 1175 struct robust_list_head __user *robust_list; 1176 #ifdef CONFIG_COMPAT 1177 struct compat_robust_list_head __user *compat_robust_list; 1178 #endif 1179 struct list_head pi_state_list; 1180 struct futex_pi_state *pi_state_cache; 1181 1182 atomic_t fs_excl; /* holding fs exclusive resources */ 1183 struct rcu_head rcu; 1184 1185 /* 1186 * cache last used pipe for splice 1187 */ 1188 struct pipe_inode_info *splice_pipe; 1189 #ifdef CONFIG_TASK_DELAY_ACCT 1190 struct task_delay_info *delays; 1191 #endif 1192 #ifdef CONFIG_FAULT_INJECTION 1193 int make_it_fail; 1194 #endif 1195 }; 1196 1197 /* 1198 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1199 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1200 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1201 * values are inverted: lower p->prio value means higher priority. 1202 * 1203 * The MAX_USER_RT_PRIO value allows the actual maximum 1204 * RT priority to be separate from the value exported to 1205 * user-space. This allows kernel threads to set their 1206 * priority to a value higher than any user task. Note: 1207 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1208 */ 1209 1210 #define MAX_USER_RT_PRIO 100 1211 #define MAX_RT_PRIO MAX_USER_RT_PRIO 1212 1213 #define MAX_PRIO (MAX_RT_PRIO + 40) 1214 #define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1215 1216 static inline int rt_prio(int prio) 1217 { 1218 if (unlikely(prio < MAX_RT_PRIO)) 1219 return 1; 1220 return 0; 1221 } 1222 1223 static inline int rt_task(struct task_struct *p) 1224 { 1225 return rt_prio(p->prio); 1226 } 1227 1228 static inline pid_t process_group(struct task_struct *tsk) 1229 { 1230 return tsk->signal->pgrp; 1231 } 1232 1233 static inline pid_t signal_session(struct signal_struct *sig) 1234 { 1235 return sig->__session; 1236 } 1237 1238 static inline pid_t process_session(struct task_struct *tsk) 1239 { 1240 return signal_session(tsk->signal); 1241 } 1242 1243 static inline void set_signal_session(struct signal_struct *sig, pid_t session) 1244 { 1245 sig->__session = session; 1246 } 1247 1248 static inline struct pid *task_pid(struct task_struct *task) 1249 { 1250 return task->pids[PIDTYPE_PID].pid; 1251 } 1252 1253 static inline struct pid *task_tgid(struct task_struct *task) 1254 { 1255 return task->group_leader->pids[PIDTYPE_PID].pid; 1256 } 1257 1258 static inline struct pid *task_pgrp(struct task_struct *task) 1259 { 1260 return task->group_leader->pids[PIDTYPE_PGID].pid; 1261 } 1262 1263 static inline struct pid *task_session(struct task_struct *task) 1264 { 1265 return task->group_leader->pids[PIDTYPE_SID].pid; 1266 } 1267 1268 /** 1269 * pid_alive - check that a task structure is not stale 1270 * @p: Task structure to be checked. 1271 * 1272 * Test if a process is not yet dead (at most zombie state) 1273 * If pid_alive fails, then pointers within the task structure 1274 * can be stale and must not be dereferenced. 1275 */ 1276 static inline int pid_alive(struct task_struct *p) 1277 { 1278 return p->pids[PIDTYPE_PID].pid != NULL; 1279 } 1280 1281 /** 1282 * is_init - check if a task structure is init 1283 * @tsk: Task structure to be checked. 1284 * 1285 * Check if a task structure is the first user space task the kernel created. 1286 */ 1287 static inline int is_init(struct task_struct *tsk) 1288 { 1289 return tsk->pid == 1; 1290 } 1291 1292 extern struct pid *cad_pid; 1293 1294 extern void free_task(struct task_struct *tsk); 1295 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1296 1297 extern void __put_task_struct(struct task_struct *t); 1298 1299 static inline void put_task_struct(struct task_struct *t) 1300 { 1301 if (atomic_dec_and_test(&t->usage)) 1302 __put_task_struct(t); 1303 } 1304 1305 /* 1306 * Per process flags 1307 */ 1308 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 1309 /* Not implemented yet, only for 486*/ 1310 #define PF_STARTING 0x00000002 /* being created */ 1311 #define PF_EXITING 0x00000004 /* getting shut down */ 1312 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 1313 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 1314 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 1315 #define PF_DUMPCORE 0x00000200 /* dumped core */ 1316 #define PF_SIGNALED 0x00000400 /* killed by a signal */ 1317 #define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1318 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 1319 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 1320 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 1321 #define PF_FROZEN 0x00010000 /* frozen for system suspend */ 1322 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 1323 #define PF_KSWAPD 0x00040000 /* I am kswapd */ 1324 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 1325 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1326 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */ 1327 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1328 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1329 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1330 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 1331 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 1332 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1333 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1334 1335 /* 1336 * Only the _current_ task can read/write to tsk->flags, but other 1337 * tasks can access tsk->flags in readonly mode for example 1338 * with tsk_used_math (like during threaded core dumping). 1339 * There is however an exception to this rule during ptrace 1340 * or during fork: the ptracer task is allowed to write to the 1341 * child->flags of its traced child (same goes for fork, the parent 1342 * can write to the child->flags), because we're guaranteed the 1343 * child is not running and in turn not changing child->flags 1344 * at the same time the parent does it. 1345 */ 1346 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1347 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1348 #define clear_used_math() clear_stopped_child_used_math(current) 1349 #define set_used_math() set_stopped_child_used_math(current) 1350 #define conditional_stopped_child_used_math(condition, child) \ 1351 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1352 #define conditional_used_math(condition) \ 1353 conditional_stopped_child_used_math(condition, current) 1354 #define copy_to_stopped_child_used_math(child) \ 1355 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1356 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1357 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1358 #define used_math() tsk_used_math(current) 1359 1360 #ifdef CONFIG_SMP 1361 extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask); 1362 #else 1363 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1364 { 1365 if (!cpu_isset(0, new_mask)) 1366 return -EINVAL; 1367 return 0; 1368 } 1369 #endif 1370 1371 extern unsigned long long sched_clock(void); 1372 1373 /* 1374 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1375 * clock constructed from sched_clock(): 1376 */ 1377 extern unsigned long long cpu_clock(int cpu); 1378 1379 extern unsigned long long 1380 task_sched_runtime(struct task_struct *task); 1381 1382 /* sched_exec is called by processes performing an exec */ 1383 #ifdef CONFIG_SMP 1384 extern void sched_exec(void); 1385 #else 1386 #define sched_exec() {} 1387 #endif 1388 1389 extern void sched_clock_unstable_event(void); 1390 1391 #ifdef CONFIG_HOTPLUG_CPU 1392 extern void idle_task_exit(void); 1393 #else 1394 static inline void idle_task_exit(void) {} 1395 #endif 1396 1397 extern void sched_idle_next(void); 1398 1399 extern unsigned int sysctl_sched_granularity; 1400 extern unsigned int sysctl_sched_wakeup_granularity; 1401 extern unsigned int sysctl_sched_batch_wakeup_granularity; 1402 extern unsigned int sysctl_sched_stat_granularity; 1403 extern unsigned int sysctl_sched_runtime_limit; 1404 extern unsigned int sysctl_sched_child_runs_first; 1405 extern unsigned int sysctl_sched_features; 1406 1407 #ifdef CONFIG_RT_MUTEXES 1408 extern int rt_mutex_getprio(struct task_struct *p); 1409 extern void rt_mutex_setprio(struct task_struct *p, int prio); 1410 extern void rt_mutex_adjust_pi(struct task_struct *p); 1411 #else 1412 static inline int rt_mutex_getprio(struct task_struct *p) 1413 { 1414 return p->normal_prio; 1415 } 1416 # define rt_mutex_adjust_pi(p) do { } while (0) 1417 #endif 1418 1419 extern void set_user_nice(struct task_struct *p, long nice); 1420 extern int task_prio(const struct task_struct *p); 1421 extern int task_nice(const struct task_struct *p); 1422 extern int can_nice(const struct task_struct *p, const int nice); 1423 extern int task_curr(const struct task_struct *p); 1424 extern int idle_cpu(int cpu); 1425 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1426 extern struct task_struct *idle_task(int cpu); 1427 extern struct task_struct *curr_task(int cpu); 1428 extern void set_curr_task(int cpu, struct task_struct *p); 1429 1430 void yield(void); 1431 1432 /* 1433 * The default (Linux) execution domain. 1434 */ 1435 extern struct exec_domain default_exec_domain; 1436 1437 union thread_union { 1438 struct thread_info thread_info; 1439 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1440 }; 1441 1442 #ifndef __HAVE_ARCH_KSTACK_END 1443 static inline int kstack_end(void *addr) 1444 { 1445 /* Reliable end of stack detection: 1446 * Some APM bios versions misalign the stack 1447 */ 1448 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1449 } 1450 #endif 1451 1452 extern union thread_union init_thread_union; 1453 extern struct task_struct init_task; 1454 1455 extern struct mm_struct init_mm; 1456 1457 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr) 1458 extern struct task_struct *find_task_by_pid_type(int type, int pid); 1459 extern void __set_special_pids(pid_t session, pid_t pgrp); 1460 1461 /* per-UID process charging. */ 1462 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 1463 static inline struct user_struct *get_uid(struct user_struct *u) 1464 { 1465 atomic_inc(&u->__count); 1466 return u; 1467 } 1468 extern void free_uid(struct user_struct *); 1469 extern void switch_uid(struct user_struct *); 1470 1471 #include <asm/current.h> 1472 1473 extern void do_timer(unsigned long ticks); 1474 1475 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); 1476 extern int FASTCALL(wake_up_process(struct task_struct * tsk)); 1477 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, 1478 unsigned long clone_flags)); 1479 #ifdef CONFIG_SMP 1480 extern void kick_process(struct task_struct *tsk); 1481 #else 1482 static inline void kick_process(struct task_struct *tsk) { } 1483 #endif 1484 extern void sched_fork(struct task_struct *p, int clone_flags); 1485 extern void sched_dead(struct task_struct *p); 1486 1487 extern int in_group_p(gid_t); 1488 extern int in_egroup_p(gid_t); 1489 1490 extern void proc_caches_init(void); 1491 extern void flush_signals(struct task_struct *); 1492 extern void ignore_signals(struct task_struct *); 1493 extern void flush_signal_handlers(struct task_struct *, int force_default); 1494 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 1495 1496 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 1497 { 1498 unsigned long flags; 1499 int ret; 1500 1501 spin_lock_irqsave(&tsk->sighand->siglock, flags); 1502 ret = dequeue_signal(tsk, mask, info); 1503 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 1504 1505 return ret; 1506 } 1507 1508 extern void block_all_signals(int (*notifier)(void *priv), void *priv, 1509 sigset_t *mask); 1510 extern void unblock_all_signals(void); 1511 extern void release_task(struct task_struct * p); 1512 extern int send_sig_info(int, struct siginfo *, struct task_struct *); 1513 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); 1514 extern int force_sigsegv(int, struct task_struct *); 1515 extern int force_sig_info(int, struct siginfo *, struct task_struct *); 1516 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1517 extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1518 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 1519 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 1520 extern int kill_pgrp(struct pid *pid, int sig, int priv); 1521 extern int kill_pid(struct pid *pid, int sig, int priv); 1522 extern int kill_proc_info(int, struct siginfo *, pid_t); 1523 extern void do_notify_parent(struct task_struct *, int); 1524 extern void force_sig(int, struct task_struct *); 1525 extern void force_sig_specific(int, struct task_struct *); 1526 extern int send_sig(int, struct task_struct *, int); 1527 extern void zap_other_threads(struct task_struct *p); 1528 extern int kill_proc(pid_t, int, int); 1529 extern struct sigqueue *sigqueue_alloc(void); 1530 extern void sigqueue_free(struct sigqueue *); 1531 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); 1532 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); 1533 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 1534 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 1535 1536 static inline int kill_cad_pid(int sig, int priv) 1537 { 1538 return kill_pid(cad_pid, sig, priv); 1539 } 1540 1541 /* These can be the second arg to send_sig_info/send_group_sig_info. */ 1542 #define SEND_SIG_NOINFO ((struct siginfo *) 0) 1543 #define SEND_SIG_PRIV ((struct siginfo *) 1) 1544 #define SEND_SIG_FORCED ((struct siginfo *) 2) 1545 1546 static inline int is_si_special(const struct siginfo *info) 1547 { 1548 return info <= SEND_SIG_FORCED; 1549 } 1550 1551 /* True if we are on the alternate signal stack. */ 1552 1553 static inline int on_sig_stack(unsigned long sp) 1554 { 1555 return (sp - current->sas_ss_sp < current->sas_ss_size); 1556 } 1557 1558 static inline int sas_ss_flags(unsigned long sp) 1559 { 1560 return (current->sas_ss_size == 0 ? SS_DISABLE 1561 : on_sig_stack(sp) ? SS_ONSTACK : 0); 1562 } 1563 1564 /* 1565 * Routines for handling mm_structs 1566 */ 1567 extern struct mm_struct * mm_alloc(void); 1568 1569 /* mmdrop drops the mm and the page tables */ 1570 extern void FASTCALL(__mmdrop(struct mm_struct *)); 1571 static inline void mmdrop(struct mm_struct * mm) 1572 { 1573 if (unlikely(atomic_dec_and_test(&mm->mm_count))) 1574 __mmdrop(mm); 1575 } 1576 1577 /* mmput gets rid of the mappings and all user-space */ 1578 extern void mmput(struct mm_struct *); 1579 /* Grab a reference to a task's mm, if it is not already going away */ 1580 extern struct mm_struct *get_task_mm(struct task_struct *task); 1581 /* Remove the current tasks stale references to the old mm_struct */ 1582 extern void mm_release(struct task_struct *, struct mm_struct *); 1583 1584 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 1585 extern void flush_thread(void); 1586 extern void exit_thread(void); 1587 1588 extern void exit_files(struct task_struct *); 1589 extern void __cleanup_signal(struct signal_struct *); 1590 extern void __cleanup_sighand(struct sighand_struct *); 1591 extern void exit_itimers(struct signal_struct *); 1592 1593 extern NORET_TYPE void do_group_exit(int); 1594 1595 extern void daemonize(const char *, ...); 1596 extern int allow_signal(int); 1597 extern int disallow_signal(int); 1598 1599 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 1600 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 1601 struct task_struct *fork_idle(int); 1602 1603 extern void set_task_comm(struct task_struct *tsk, char *from); 1604 extern void get_task_comm(char *to, struct task_struct *tsk); 1605 1606 #ifdef CONFIG_SMP 1607 extern void wait_task_inactive(struct task_struct * p); 1608 #else 1609 #define wait_task_inactive(p) do { } while (0) 1610 #endif 1611 1612 #define remove_parent(p) list_del_init(&(p)->sibling) 1613 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children) 1614 1615 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) 1616 1617 #define for_each_process(p) \ 1618 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 1619 1620 /* 1621 * Careful: do_each_thread/while_each_thread is a double loop so 1622 * 'break' will not work as expected - use goto instead. 1623 */ 1624 #define do_each_thread(g, t) \ 1625 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 1626 1627 #define while_each_thread(g, t) \ 1628 while ((t = next_thread(t)) != g) 1629 1630 /* de_thread depends on thread_group_leader not being a pid based check */ 1631 #define thread_group_leader(p) (p == p->group_leader) 1632 1633 /* Do to the insanities of de_thread it is possible for a process 1634 * to have the pid of the thread group leader without actually being 1635 * the thread group leader. For iteration through the pids in proc 1636 * all we care about is that we have a task with the appropriate 1637 * pid, we don't actually care if we have the right task. 1638 */ 1639 static inline int has_group_leader_pid(struct task_struct *p) 1640 { 1641 return p->pid == p->tgid; 1642 } 1643 1644 static inline struct task_struct *next_thread(const struct task_struct *p) 1645 { 1646 return list_entry(rcu_dereference(p->thread_group.next), 1647 struct task_struct, thread_group); 1648 } 1649 1650 static inline int thread_group_empty(struct task_struct *p) 1651 { 1652 return list_empty(&p->thread_group); 1653 } 1654 1655 #define delay_group_leader(p) \ 1656 (thread_group_leader(p) && !thread_group_empty(p)) 1657 1658 /* 1659 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 1660 * subscriptions and synchronises with wait4(). Also used in procfs. Also 1661 * pins the final release of task.io_context. Also protects ->cpuset. 1662 * 1663 * Nests both inside and outside of read_lock(&tasklist_lock). 1664 * It must not be nested with write_lock_irq(&tasklist_lock), 1665 * neither inside nor outside. 1666 */ 1667 static inline void task_lock(struct task_struct *p) 1668 { 1669 spin_lock(&p->alloc_lock); 1670 } 1671 1672 static inline void task_unlock(struct task_struct *p) 1673 { 1674 spin_unlock(&p->alloc_lock); 1675 } 1676 1677 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 1678 unsigned long *flags); 1679 1680 static inline void unlock_task_sighand(struct task_struct *tsk, 1681 unsigned long *flags) 1682 { 1683 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 1684 } 1685 1686 #ifndef __HAVE_THREAD_FUNCTIONS 1687 1688 #define task_thread_info(task) ((struct thread_info *)(task)->stack) 1689 #define task_stack_page(task) ((task)->stack) 1690 1691 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 1692 { 1693 *task_thread_info(p) = *task_thread_info(org); 1694 task_thread_info(p)->task = p; 1695 } 1696 1697 static inline unsigned long *end_of_stack(struct task_struct *p) 1698 { 1699 return (unsigned long *)(task_thread_info(p) + 1); 1700 } 1701 1702 #endif 1703 1704 /* set thread flags in other task's structures 1705 * - see asm/thread_info.h for TIF_xxxx flags available 1706 */ 1707 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 1708 { 1709 set_ti_thread_flag(task_thread_info(tsk), flag); 1710 } 1711 1712 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1713 { 1714 clear_ti_thread_flag(task_thread_info(tsk), flag); 1715 } 1716 1717 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 1718 { 1719 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 1720 } 1721 1722 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1723 { 1724 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 1725 } 1726 1727 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 1728 { 1729 return test_ti_thread_flag(task_thread_info(tsk), flag); 1730 } 1731 1732 static inline void set_tsk_need_resched(struct task_struct *tsk) 1733 { 1734 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1735 } 1736 1737 static inline void clear_tsk_need_resched(struct task_struct *tsk) 1738 { 1739 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1740 } 1741 1742 static inline int signal_pending(struct task_struct *p) 1743 { 1744 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 1745 } 1746 1747 static inline int need_resched(void) 1748 { 1749 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 1750 } 1751 1752 /* 1753 * cond_resched() and cond_resched_lock(): latency reduction via 1754 * explicit rescheduling in places that are safe. The return 1755 * value indicates whether a reschedule was done in fact. 1756 * cond_resched_lock() will drop the spinlock before scheduling, 1757 * cond_resched_softirq() will enable bhs before scheduling. 1758 */ 1759 extern int cond_resched(void); 1760 extern int cond_resched_lock(spinlock_t * lock); 1761 extern int cond_resched_softirq(void); 1762 1763 /* 1764 * Does a critical section need to be broken due to another 1765 * task waiting?: 1766 */ 1767 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) 1768 # define need_lockbreak(lock) ((lock)->break_lock) 1769 #else 1770 # define need_lockbreak(lock) 0 1771 #endif 1772 1773 /* 1774 * Does a critical section need to be broken due to another 1775 * task waiting or preemption being signalled: 1776 */ 1777 static inline int lock_need_resched(spinlock_t *lock) 1778 { 1779 if (need_lockbreak(lock) || need_resched()) 1780 return 1; 1781 return 0; 1782 } 1783 1784 /* 1785 * Reevaluate whether the task has signals pending delivery. 1786 * Wake the task if so. 1787 * This is required every time the blocked sigset_t changes. 1788 * callers must hold sighand->siglock. 1789 */ 1790 extern void recalc_sigpending_and_wake(struct task_struct *t); 1791 extern void recalc_sigpending(void); 1792 1793 extern void signal_wake_up(struct task_struct *t, int resume_stopped); 1794 1795 /* 1796 * Wrappers for p->thread_info->cpu access. No-op on UP. 1797 */ 1798 #ifdef CONFIG_SMP 1799 1800 static inline unsigned int task_cpu(const struct task_struct *p) 1801 { 1802 return task_thread_info(p)->cpu; 1803 } 1804 1805 extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 1806 1807 #else 1808 1809 static inline unsigned int task_cpu(const struct task_struct *p) 1810 { 1811 return 0; 1812 } 1813 1814 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 1815 { 1816 } 1817 1818 #endif /* CONFIG_SMP */ 1819 1820 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1821 extern void arch_pick_mmap_layout(struct mm_struct *mm); 1822 #else 1823 static inline void arch_pick_mmap_layout(struct mm_struct *mm) 1824 { 1825 mm->mmap_base = TASK_UNMAPPED_BASE; 1826 mm->get_unmapped_area = arch_get_unmapped_area; 1827 mm->unmap_area = arch_unmap_area; 1828 } 1829 #endif 1830 1831 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); 1832 extern long sched_getaffinity(pid_t pid, cpumask_t *mask); 1833 1834 extern int sched_mc_power_savings, sched_smt_power_savings; 1835 1836 extern void normalize_rt_tasks(void); 1837 1838 #ifdef CONFIG_TASK_XACCT 1839 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 1840 { 1841 tsk->rchar += amt; 1842 } 1843 1844 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 1845 { 1846 tsk->wchar += amt; 1847 } 1848 1849 static inline void inc_syscr(struct task_struct *tsk) 1850 { 1851 tsk->syscr++; 1852 } 1853 1854 static inline void inc_syscw(struct task_struct *tsk) 1855 { 1856 tsk->syscw++; 1857 } 1858 #else 1859 static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 1860 { 1861 } 1862 1863 static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 1864 { 1865 } 1866 1867 static inline void inc_syscr(struct task_struct *tsk) 1868 { 1869 } 1870 1871 static inline void inc_syscw(struct task_struct *tsk) 1872 { 1873 } 1874 #endif 1875 1876 #endif /* __KERNEL__ */ 1877 1878 #endif 1879