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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 | #ifdef CONFIG_PROVE_RCU |
262 | extern int lockdep_tasklist_lock_is_held(void); |
263 | #endif /* #ifdef CONFIG_PROVE_RCU */ |
264 | |
265 | extern void sched_init(void); |
266 | extern void sched_init_smp(void); |
267 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
268 | extern void init_idle(struct task_struct *idle, int cpu); |
269 | extern void init_idle_bootup_task(struct task_struct *idle); |
270 | |
271 | extern int runqueue_is_locked(int cpu); |
272 | extern void task_rq_unlock_wait(struct task_struct *p); |
273 | |
274 | extern cpumask_var_t nohz_cpu_mask; |
275 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
276 | extern int select_nohz_load_balancer(int cpu); |
277 | extern int get_nohz_load_balancer(void); |
278 | #else |
279 | static inline int select_nohz_load_balancer(int cpu) |
280 | { |
281 | return 0; |
282 | } |
283 | #endif |
284 | |
285 | /* |
286 | * Only dump TASK_* tasks. (0 for all tasks) |
287 | */ |
288 | extern void show_state_filter(unsigned long state_filter); |
289 | |
290 | static inline void show_state(void) |
291 | { |
292 | show_state_filter(0); |
293 | } |
294 | |
295 | extern void show_regs(struct pt_regs *); |
296 | |
297 | /* |
298 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current |
299 | * task), SP is the stack pointer of the first frame that should be shown in the back |
300 | * trace (or NULL if the entire call-chain of the task should be shown). |
301 | */ |
302 | extern void show_stack(struct task_struct *task, unsigned long *sp); |
303 | |
304 | void io_schedule(void); |
305 | long io_schedule_timeout(long timeout); |
306 | |
307 | extern void cpu_init (void); |
308 | extern void trap_init(void); |
309 | extern void update_process_times(int user); |
310 | extern void scheduler_tick(void); |
311 | |
312 | extern void sched_show_task(struct task_struct *p); |
313 | |
314 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
315 | extern void softlockup_tick(void); |
316 | extern void touch_softlockup_watchdog(void); |
317 | extern void touch_softlockup_watchdog_sync(void); |
318 | extern void touch_all_softlockup_watchdogs(void); |
319 | extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write, |
320 | void __user *buffer, |
321 | size_t *lenp, loff_t *ppos); |
322 | extern unsigned int softlockup_panic; |
323 | extern int softlockup_thresh; |
324 | #else |
325 | static inline void softlockup_tick(void) |
326 | { |
327 | } |
328 | static inline void touch_softlockup_watchdog(void) |
329 | { |
330 | } |
331 | static inline void touch_softlockup_watchdog_sync(void) |
332 | { |
333 | } |
334 | static inline void touch_all_softlockup_watchdogs(void) |
335 | { |
336 | } |
337 | #endif |
338 | |
339 | #ifdef CONFIG_DETECT_HUNG_TASK |
340 | extern unsigned int sysctl_hung_task_panic; |
341 | extern unsigned long sysctl_hung_task_check_count; |
342 | extern unsigned long sysctl_hung_task_timeout_secs; |
343 | extern unsigned long sysctl_hung_task_warnings; |
344 | extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, |
345 | void __user *buffer, |
346 | size_t *lenp, loff_t *ppos); |
347 | #endif |
348 | |
349 | /* Attach to any functions which should be ignored in wchan output. */ |
350 | #define __sched __attribute__((__section__(".sched.text"))) |
351 | |
352 | /* Linker adds these: start and end of __sched functions */ |
353 | extern char __sched_text_start[], __sched_text_end[]; |
354 | |
355 | /* Is this address in the __sched functions? */ |
356 | extern int in_sched_functions(unsigned long addr); |
357 | |
358 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
359 | extern signed long schedule_timeout(signed long timeout); |
360 | extern signed long schedule_timeout_interruptible(signed long timeout); |
361 | extern signed long schedule_timeout_killable(signed long timeout); |
362 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
363 | asmlinkage void schedule(void); |
364 | extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner); |
365 | |
366 | struct nsproxy; |
367 | struct user_namespace; |
368 | |
369 | /* |
370 | * Default maximum number of active map areas, this limits the number of vmas |
371 | * per mm struct. Users can overwrite this number by sysctl but there is a |
372 | * problem. |
373 | * |
374 | * When a program's coredump is generated as ELF format, a section is created |
375 | * per a vma. In ELF, the number of sections is represented in unsigned short. |
376 | * This means the number of sections should be smaller than 65535 at coredump. |
377 | * Because the kernel adds some informative sections to a image of program at |
378 | * generating coredump, we need some margin. The number of extra sections is |
379 | * 1-3 now and depends on arch. We use "5" as safe margin, here. |
380 | */ |
381 | #define MAPCOUNT_ELF_CORE_MARGIN (5) |
382 | #define DEFAULT_MAX_MAP_COUNT (USHORT_MAX - MAPCOUNT_ELF_CORE_MARGIN) |
383 | |
384 | extern int sysctl_max_map_count; |
385 | |
386 | #include <linux/aio.h> |
387 | |
388 | #ifdef CONFIG_MMU |
389 | extern void arch_pick_mmap_layout(struct mm_struct *mm); |
390 | extern unsigned long |
391 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, |
392 | unsigned long, unsigned long); |
393 | extern unsigned long |
394 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, |
395 | unsigned long len, unsigned long pgoff, |
396 | unsigned long flags); |
397 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
398 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); |
399 | #else |
400 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} |
401 | #endif |
402 | |
403 | |
404 | extern void set_dumpable(struct mm_struct *mm, int value); |
405 | extern int get_dumpable(struct mm_struct *mm); |
406 | |
407 | /* mm flags */ |
408 | /* dumpable bits */ |
409 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
410 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ |
411 | |
412 | #define MMF_DUMPABLE_BITS 2 |
413 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
414 | |
415 | /* coredump filter bits */ |
416 | #define MMF_DUMP_ANON_PRIVATE 2 |
417 | #define MMF_DUMP_ANON_SHARED 3 |
418 | #define MMF_DUMP_MAPPED_PRIVATE 4 |
419 | #define MMF_DUMP_MAPPED_SHARED 5 |
420 | #define MMF_DUMP_ELF_HEADERS 6 |
421 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
422 | #define MMF_DUMP_HUGETLB_SHARED 8 |
423 | |
424 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
425 | #define MMF_DUMP_FILTER_BITS 7 |
426 | #define MMF_DUMP_FILTER_MASK \ |
427 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) |
428 | #define MMF_DUMP_FILTER_DEFAULT \ |
429 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
430 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
431 | |
432 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS |
433 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) |
434 | #else |
435 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 |
436 | #endif |
437 | /* leave room for more dump flags */ |
438 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ |
439 | |
440 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) |
441 | |
442 | struct sighand_struct { |
443 | atomic_t count; |
444 | struct k_sigaction action[_NSIG]; |
445 | spinlock_t siglock; |
446 | wait_queue_head_t signalfd_wqh; |
447 | }; |
448 | |
449 | struct pacct_struct { |
450 | int ac_flag; |
451 | long ac_exitcode; |
452 | unsigned long ac_mem; |
453 | cputime_t ac_utime, ac_stime; |
454 | unsigned long ac_minflt, ac_majflt; |
455 | }; |
456 | |
457 | struct cpu_itimer { |
458 | cputime_t expires; |
459 | cputime_t incr; |
460 | u32 error; |
461 | u32 incr_error; |
462 | }; |
463 | |
464 | /** |
465 | * struct task_cputime - collected CPU time counts |
466 | * @utime: time spent in user mode, in &cputime_t units |
467 | * @stime: time spent in kernel mode, in &cputime_t units |
468 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds |
469 | * |
470 | * This structure groups together three kinds of CPU time that are |
471 | * tracked for threads and thread groups. Most things considering |
472 | * CPU time want to group these counts together and treat all three |
473 | * of them in parallel. |
474 | */ |
475 | struct task_cputime { |
476 | cputime_t utime; |
477 | cputime_t stime; |
478 | unsigned long long sum_exec_runtime; |
479 | }; |
480 | /* Alternate field names when used to cache expirations. */ |
481 | #define prof_exp stime |
482 | #define virt_exp utime |
483 | #define sched_exp sum_exec_runtime |
484 | |
485 | #define INIT_CPUTIME \ |
486 | (struct task_cputime) { \ |
487 | .utime = cputime_zero, \ |
488 | .stime = cputime_zero, \ |
489 | .sum_exec_runtime = 0, \ |
490 | } |
491 | |
492 | /* |
493 | * Disable preemption until the scheduler is running. |
494 | * Reset by start_kernel()->sched_init()->init_idle(). |
495 | * |
496 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working |
497 | * before the scheduler is active -- see should_resched(). |
498 | */ |
499 | #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) |
500 | |
501 | /** |
502 | * struct thread_group_cputimer - thread group interval timer counts |
503 | * @cputime: thread group interval timers. |
504 | * @running: non-zero when there are timers running and |
505 | * @cputime receives updates. |
506 | * @lock: lock for fields in this struct. |
507 | * |
508 | * This structure contains the version of task_cputime, above, that is |
509 | * used for thread group CPU timer calculations. |
510 | */ |
511 | struct thread_group_cputimer { |
512 | struct task_cputime cputime; |
513 | int running; |
514 | spinlock_t lock; |
515 | }; |
516 | |
517 | /* |
518 | * NOTE! "signal_struct" does not have it's own |
519 | * locking, because a shared signal_struct always |
520 | * implies a shared sighand_struct, so locking |
521 | * sighand_struct is always a proper superset of |
522 | * the locking of signal_struct. |
523 | */ |
524 | struct signal_struct { |
525 | atomic_t count; |
526 | atomic_t live; |
527 | |
528 | wait_queue_head_t wait_chldexit; /* for wait4() */ |
529 | |
530 | /* current thread group signal load-balancing target: */ |
531 | struct task_struct *curr_target; |
532 | |
533 | /* shared signal handling: */ |
534 | struct sigpending shared_pending; |
535 | |
536 | /* thread group exit support */ |
537 | int group_exit_code; |
538 | /* overloaded: |
539 | * - notify group_exit_task when ->count is equal to notify_count |
540 | * - everyone except group_exit_task is stopped during signal delivery |
541 | * of fatal signals, group_exit_task processes the signal. |
542 | */ |
543 | int notify_count; |
544 | struct task_struct *group_exit_task; |
545 | |
546 | /* thread group stop support, overloads group_exit_code too */ |
547 | int group_stop_count; |
548 | unsigned int flags; /* see SIGNAL_* flags below */ |
549 | |
550 | /* POSIX.1b Interval Timers */ |
551 | struct list_head posix_timers; |
552 | |
553 | /* ITIMER_REAL timer for the process */ |
554 | struct hrtimer real_timer; |
555 | struct pid *leader_pid; |
556 | ktime_t it_real_incr; |
557 | |
558 | /* |
559 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use |
560 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these |
561 | * values are defined to 0 and 1 respectively |
562 | */ |
563 | struct cpu_itimer it[2]; |
564 | |
565 | /* |
566 | * Thread group totals for process CPU timers. |
567 | * See thread_group_cputimer(), et al, for details. |
568 | */ |
569 | struct thread_group_cputimer cputimer; |
570 | |
571 | /* Earliest-expiration cache. */ |
572 | struct task_cputime cputime_expires; |
573 | |
574 | struct list_head cpu_timers[3]; |
575 | |
576 | struct pid *tty_old_pgrp; |
577 | |
578 | /* boolean value for session group leader */ |
579 | int leader; |
580 | |
581 | struct tty_struct *tty; /* NULL if no tty */ |
582 | |
583 | /* |
584 | * Cumulative resource counters for dead threads in the group, |
585 | * and for reaped dead child processes forked by this group. |
586 | * Live threads maintain their own counters and add to these |
587 | * in __exit_signal, except for the group leader. |
588 | */ |
589 | cputime_t utime, stime, cutime, cstime; |
590 | cputime_t gtime; |
591 | cputime_t cgtime; |
592 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
593 | cputime_t prev_utime, prev_stime; |
594 | #endif |
595 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
596 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; |
597 | unsigned long inblock, oublock, cinblock, coublock; |
598 | unsigned long maxrss, cmaxrss; |
599 | struct task_io_accounting ioac; |
600 | |
601 | /* |
602 | * Cumulative ns of schedule CPU time fo dead threads in the |
603 | * group, not including a zombie group leader, (This only differs |
604 | * from jiffies_to_ns(utime + stime) if sched_clock uses something |
605 | * other than jiffies.) |
606 | */ |
607 | unsigned long long sum_sched_runtime; |
608 | |
609 | /* |
610 | * We don't bother to synchronize most readers of this at all, |
611 | * because there is no reader checking a limit that actually needs |
612 | * to get both rlim_cur and rlim_max atomically, and either one |
613 | * alone is a single word that can safely be read normally. |
614 | * getrlimit/setrlimit use task_lock(current->group_leader) to |
615 | * protect this instead of the siglock, because they really |
616 | * have no need to disable irqs. |
617 | */ |
618 | struct rlimit rlim[RLIM_NLIMITS]; |
619 | |
620 | #ifdef CONFIG_BSD_PROCESS_ACCT |
621 | struct pacct_struct pacct; /* per-process accounting information */ |
622 | #endif |
623 | #ifdef CONFIG_TASKSTATS |
624 | struct taskstats *stats; |
625 | #endif |
626 | #ifdef CONFIG_AUDIT |
627 | unsigned audit_tty; |
628 | struct tty_audit_buf *tty_audit_buf; |
629 | #endif |
630 | |
631 | int oom_adj; /* OOM kill score adjustment (bit shift) */ |
632 | }; |
633 | |
634 | /* Context switch must be unlocked if interrupts are to be enabled */ |
635 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW |
636 | # define __ARCH_WANT_UNLOCKED_CTXSW |
637 | #endif |
638 | |
639 | /* |
640 | * Bits in flags field of signal_struct. |
641 | */ |
642 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ |
643 | #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ |
644 | #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ |
645 | #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ |
646 | /* |
647 | * Pending notifications to parent. |
648 | */ |
649 | #define SIGNAL_CLD_STOPPED 0x00000010 |
650 | #define SIGNAL_CLD_CONTINUED 0x00000020 |
651 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) |
652 | |
653 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
654 | |
655 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
656 | static inline int signal_group_exit(const struct signal_struct *sig) |
657 | { |
658 | return (sig->flags & SIGNAL_GROUP_EXIT) || |
659 | (sig->group_exit_task != NULL); |
660 | } |
661 | |
662 | /* |
663 | * Some day this will be a full-fledged user tracking system.. |
664 | */ |
665 | struct user_struct { |
666 | atomic_t __count; /* reference count */ |
667 | atomic_t processes; /* How many processes does this user have? */ |
668 | atomic_t files; /* How many open files does this user have? */ |
669 | atomic_t sigpending; /* How many pending signals does this user have? */ |
670 | #ifdef CONFIG_INOTIFY_USER |
671 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
672 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ |
673 | #endif |
674 | #ifdef CONFIG_EPOLL |
675 | atomic_t epoll_watches; /* The number of file descriptors currently watched */ |
676 | #endif |
677 | #ifdef CONFIG_POSIX_MQUEUE |
678 | /* protected by mq_lock */ |
679 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ |
680 | #endif |
681 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
682 | |
683 | #ifdef CONFIG_KEYS |
684 | struct key *uid_keyring; /* UID specific keyring */ |
685 | struct key *session_keyring; /* UID's default session keyring */ |
686 | #endif |
687 | |
688 | /* Hash table maintenance information */ |
689 | struct hlist_node uidhash_node; |
690 | uid_t uid; |
691 | struct user_namespace *user_ns; |
692 | |
693 | #ifdef CONFIG_PERF_EVENTS |
694 | atomic_long_t locked_vm; |
695 | #endif |
696 | }; |
697 | |
698 | extern int uids_sysfs_init(void); |
699 | |
700 | extern struct user_struct *find_user(uid_t); |
701 | |
702 | extern struct user_struct root_user; |
703 | #define INIT_USER (&root_user) |
704 | |
705 | |
706 | struct backing_dev_info; |
707 | struct reclaim_state; |
708 | |
709 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
710 | struct sched_info { |
711 | /* cumulative counters */ |
712 | unsigned long pcount; /* # of times run on this cpu */ |
713 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
714 | |
715 | /* timestamps */ |
716 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
717 | last_queued; /* when we were last queued to run */ |
718 | #ifdef CONFIG_SCHEDSTATS |
719 | /* BKL stats */ |
720 | unsigned int bkl_count; |
721 | #endif |
722 | }; |
723 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
724 | |
725 | #ifdef CONFIG_TASK_DELAY_ACCT |
726 | struct task_delay_info { |
727 | spinlock_t lock; |
728 | unsigned int flags; /* Private per-task flags */ |
729 | |
730 | /* For each stat XXX, add following, aligned appropriately |
731 | * |
732 | * struct timespec XXX_start, XXX_end; |
733 | * u64 XXX_delay; |
734 | * u32 XXX_count; |
735 | * |
736 | * Atomicity of updates to XXX_delay, XXX_count protected by |
737 | * single lock above (split into XXX_lock if contention is an issue). |
738 | */ |
739 | |
740 | /* |
741 | * XXX_count is incremented on every XXX operation, the delay |
742 | * associated with the operation is added to XXX_delay. |
743 | * XXX_delay contains the accumulated delay time in nanoseconds. |
744 | */ |
745 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ |
746 | u64 blkio_delay; /* wait for sync block io completion */ |
747 | u64 swapin_delay; /* wait for swapin block io completion */ |
748 | u32 blkio_count; /* total count of the number of sync block */ |
749 | /* io operations performed */ |
750 | u32 swapin_count; /* total count of the number of swapin block */ |
751 | /* io operations performed */ |
752 | |
753 | struct timespec freepages_start, freepages_end; |
754 | u64 freepages_delay; /* wait for memory reclaim */ |
755 | u32 freepages_count; /* total count of memory reclaim */ |
756 | }; |
757 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
758 | |
759 | static inline int sched_info_on(void) |
760 | { |
761 | #ifdef CONFIG_SCHEDSTATS |
762 | return 1; |
763 | #elif defined(CONFIG_TASK_DELAY_ACCT) |
764 | extern int delayacct_on; |
765 | return delayacct_on; |
766 | #else |
767 | return 0; |
768 | #endif |
769 | } |
770 | |
771 | enum cpu_idle_type { |
772 | CPU_IDLE, |
773 | CPU_NOT_IDLE, |
774 | CPU_NEWLY_IDLE, |
775 | CPU_MAX_IDLE_TYPES |
776 | }; |
777 | |
778 | /* |
779 | * sched-domains (multiprocessor balancing) declarations: |
780 | */ |
781 | |
782 | /* |
783 | * Increase resolution of nice-level calculations: |
784 | */ |
785 | #define SCHED_LOAD_SHIFT 10 |
786 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) |
787 | |
788 | #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE |
789 | |
790 | #ifdef CONFIG_SMP |
791 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
792 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ |
793 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ |
794 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ |
795 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
796 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
797 | #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */ |
798 | #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ |
799 | #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */ |
800 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ |
801 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ |
802 | |
803 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
804 | |
805 | enum powersavings_balance_level { |
806 | POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ |
807 | POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package |
808 | * first for long running threads |
809 | */ |
810 | POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle |
811 | * cpu package for power savings |
812 | */ |
813 | MAX_POWERSAVINGS_BALANCE_LEVELS |
814 | }; |
815 | |
816 | extern int sched_mc_power_savings, sched_smt_power_savings; |
817 | |
818 | static inline int sd_balance_for_mc_power(void) |
819 | { |
820 | if (sched_smt_power_savings) |
821 | return SD_POWERSAVINGS_BALANCE; |
822 | |
823 | if (!sched_mc_power_savings) |
824 | return SD_PREFER_SIBLING; |
825 | |
826 | return 0; |
827 | } |
828 | |
829 | static inline int sd_balance_for_package_power(void) |
830 | { |
831 | if (sched_mc_power_savings | sched_smt_power_savings) |
832 | return SD_POWERSAVINGS_BALANCE; |
833 | |
834 | return SD_PREFER_SIBLING; |
835 | } |
836 | |
837 | /* |
838 | * Optimise SD flags for power savings: |
839 | * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings. |
840 | * Keep default SD flags if sched_{smt,mc}_power_saving=0 |
841 | */ |
842 | |
843 | static inline int sd_power_saving_flags(void) |
844 | { |
845 | if (sched_mc_power_savings | sched_smt_power_savings) |
846 | return SD_BALANCE_NEWIDLE; |
847 | |
848 | return 0; |
849 | } |
850 | |
851 | struct sched_group { |
852 | struct sched_group *next; /* Must be a circular list */ |
853 | |
854 | /* |
855 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a |
856 | * single CPU. |
857 | */ |
858 | unsigned int cpu_power; |
859 | |
860 | /* |
861 | * The CPUs this group covers. |
862 | * |
863 | * NOTE: this field is variable length. (Allocated dynamically |
864 | * by attaching extra space to the end of the structure, |
865 | * depending on how many CPUs the kernel has booted up with) |
866 | * |
867 | * It is also be embedded into static data structures at build |
868 | * time. (See 'struct static_sched_group' in kernel/sched.c) |
869 | */ |
870 | unsigned long cpumask[0]; |
871 | }; |
872 | |
873 | static inline struct cpumask *sched_group_cpus(struct sched_group *sg) |
874 | { |
875 | return to_cpumask(sg->cpumask); |
876 | } |
877 | |
878 | enum sched_domain_level { |
879 | SD_LV_NONE = 0, |
880 | SD_LV_SIBLING, |
881 | SD_LV_MC, |
882 | SD_LV_CPU, |
883 | SD_LV_NODE, |
884 | SD_LV_ALLNODES, |
885 | SD_LV_MAX |
886 | }; |
887 | |
888 | struct sched_domain_attr { |
889 | int relax_domain_level; |
890 | }; |
891 | |
892 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ |
893 | .relax_domain_level = -1, \ |
894 | } |
895 | |
896 | struct sched_domain { |
897 | /* These fields must be setup */ |
898 | struct sched_domain *parent; /* top domain must be null terminated */ |
899 | struct sched_domain *child; /* bottom domain must be null terminated */ |
900 | struct sched_group *groups; /* the balancing groups of the domain */ |
901 | unsigned long min_interval; /* Minimum balance interval ms */ |
902 | unsigned long max_interval; /* Maximum balance interval ms */ |
903 | unsigned int busy_factor; /* less balancing by factor if busy */ |
904 | unsigned int imbalance_pct; /* No balance until over watermark */ |
905 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
906 | unsigned int busy_idx; |
907 | unsigned int idle_idx; |
908 | unsigned int newidle_idx; |
909 | unsigned int wake_idx; |
910 | unsigned int forkexec_idx; |
911 | unsigned int smt_gain; |
912 | int flags; /* See SD_* */ |
913 | enum sched_domain_level level; |
914 | |
915 | /* Runtime fields. */ |
916 | unsigned long last_balance; /* init to jiffies. units in jiffies */ |
917 | unsigned int balance_interval; /* initialise to 1. units in ms. */ |
918 | unsigned int nr_balance_failed; /* initialise to 0 */ |
919 | |
920 | u64 last_update; |
921 | |
922 | #ifdef CONFIG_SCHEDSTATS |
923 | /* load_balance() stats */ |
924 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
925 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; |
926 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; |
927 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; |
928 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; |
929 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; |
930 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; |
931 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; |
932 | |
933 | /* Active load balancing */ |
934 | unsigned int alb_count; |
935 | unsigned int alb_failed; |
936 | unsigned int alb_pushed; |
937 | |
938 | /* SD_BALANCE_EXEC stats */ |
939 | unsigned int sbe_count; |
940 | unsigned int sbe_balanced; |
941 | unsigned int sbe_pushed; |
942 | |
943 | /* SD_BALANCE_FORK stats */ |
944 | unsigned int sbf_count; |
945 | unsigned int sbf_balanced; |
946 | unsigned int sbf_pushed; |
947 | |
948 | /* try_to_wake_up() stats */ |
949 | unsigned int ttwu_wake_remote; |
950 | unsigned int ttwu_move_affine; |
951 | unsigned int ttwu_move_balance; |
952 | #endif |
953 | #ifdef CONFIG_SCHED_DEBUG |
954 | char *name; |
955 | #endif |
956 | |
957 | /* |
958 | * Span of all CPUs in this domain. |
959 | * |
960 | * NOTE: this field is variable length. (Allocated dynamically |
961 | * by attaching extra space to the end of the structure, |
962 | * depending on how many CPUs the kernel has booted up with) |
963 | * |
964 | * It is also be embedded into static data structures at build |
965 | * time. (See 'struct static_sched_domain' in kernel/sched.c) |
966 | */ |
967 | unsigned long span[0]; |
968 | }; |
969 | |
970 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
971 | { |
972 | return to_cpumask(sd->span); |
973 | } |
974 | |
975 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
976 | struct sched_domain_attr *dattr_new); |
977 | |
978 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
979 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); |
980 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); |
981 | |
982 | /* Test a flag in parent sched domain */ |
983 | static inline int test_sd_parent(struct sched_domain *sd, int flag) |
984 | { |
985 | if (sd->parent && (sd->parent->flags & flag)) |
986 | return 1; |
987 | |
988 | return 0; |
989 | } |
990 | |
991 | unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); |
992 | unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); |
993 | |
994 | #else /* CONFIG_SMP */ |
995 | |
996 | struct sched_domain_attr; |
997 | |
998 | static inline void |
999 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1000 | struct sched_domain_attr *dattr_new) |
1001 | { |
1002 | } |
1003 | #endif /* !CONFIG_SMP */ |
1004 | |
1005 | |
1006 | struct io_context; /* See blkdev.h */ |
1007 | |
1008 | |
1009 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
1010 | extern void prefetch_stack(struct task_struct *t); |
1011 | #else |
1012 | static inline void prefetch_stack(struct task_struct *t) { } |
1013 | #endif |
1014 | |
1015 | struct audit_context; /* See audit.c */ |
1016 | struct mempolicy; |
1017 | struct pipe_inode_info; |
1018 | struct uts_namespace; |
1019 | |
1020 | struct rq; |
1021 | struct sched_domain; |
1022 | |
1023 | /* |
1024 | * wake flags |
1025 | */ |
1026 | #define WF_SYNC 0x01 /* waker goes to sleep after wakup */ |
1027 | #define WF_FORK 0x02 /* child wakeup after fork */ |
1028 | |
1029 | struct sched_class { |
1030 | const struct sched_class *next; |
1031 | |
1032 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup, |
1033 | bool head); |
1034 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); |
1035 | void (*yield_task) (struct rq *rq); |
1036 | |
1037 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); |
1038 | |
1039 | struct task_struct * (*pick_next_task) (struct rq *rq); |
1040 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
1041 | |
1042 | #ifdef CONFIG_SMP |
1043 | int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags); |
1044 | |
1045 | void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); |
1046 | void (*post_schedule) (struct rq *this_rq); |
1047 | void (*task_waking) (struct rq *this_rq, struct task_struct *task); |
1048 | void (*task_woken) (struct rq *this_rq, struct task_struct *task); |
1049 | |
1050 | void (*set_cpus_allowed)(struct task_struct *p, |
1051 | const struct cpumask *newmask); |
1052 | |
1053 | void (*rq_online)(struct rq *rq); |
1054 | void (*rq_offline)(struct rq *rq); |
1055 | #endif |
1056 | |
1057 | void (*set_curr_task) (struct rq *rq); |
1058 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); |
1059 | void (*task_fork) (struct task_struct *p); |
1060 | |
1061 | void (*switched_from) (struct rq *this_rq, struct task_struct *task, |
1062 | int running); |
1063 | void (*switched_to) (struct rq *this_rq, struct task_struct *task, |
1064 | int running); |
1065 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, |
1066 | int oldprio, int running); |
1067 | |
1068 | unsigned int (*get_rr_interval) (struct rq *rq, |
1069 | struct task_struct *task); |
1070 | |
1071 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1072 | void (*moved_group) (struct task_struct *p, int on_rq); |
1073 | #endif |
1074 | }; |
1075 | |
1076 | struct load_weight { |
1077 | unsigned long weight, inv_weight; |
1078 | }; |
1079 | |
1080 | /* |
1081 | * CFS stats for a schedulable entity (task, task-group etc) |
1082 | * |
1083 | * Current field usage histogram: |
1084 | * |
1085 | * 4 se->block_start |
1086 | * 4 se->run_node |
1087 | * 4 se->sleep_start |
1088 | * 6 se->load.weight |
1089 | */ |
1090 | struct sched_entity { |
1091 | struct load_weight load; /* for load-balancing */ |
1092 | struct rb_node run_node; |
1093 | struct list_head group_node; |
1094 | unsigned int on_rq; |
1095 | |
1096 | u64 exec_start; |
1097 | u64 sum_exec_runtime; |
1098 | u64 vruntime; |
1099 | u64 prev_sum_exec_runtime; |
1100 | |
1101 | u64 last_wakeup; |
1102 | u64 avg_overlap; |
1103 | |
1104 | u64 nr_migrations; |
1105 | |
1106 | u64 start_runtime; |
1107 | u64 avg_wakeup; |
1108 | |
1109 | #ifdef CONFIG_SCHEDSTATS |
1110 | u64 wait_start; |
1111 | u64 wait_max; |
1112 | u64 wait_count; |
1113 | u64 wait_sum; |
1114 | u64 iowait_count; |
1115 | u64 iowait_sum; |
1116 | |
1117 | u64 sleep_start; |
1118 | u64 sleep_max; |
1119 | s64 sum_sleep_runtime; |
1120 | |
1121 | u64 block_start; |
1122 | u64 block_max; |
1123 | u64 exec_max; |
1124 | u64 slice_max; |
1125 | |
1126 | u64 nr_migrations_cold; |
1127 | u64 nr_failed_migrations_affine; |
1128 | u64 nr_failed_migrations_running; |
1129 | u64 nr_failed_migrations_hot; |
1130 | u64 nr_forced_migrations; |
1131 | |
1132 | u64 nr_wakeups; |
1133 | u64 nr_wakeups_sync; |
1134 | u64 nr_wakeups_migrate; |
1135 | u64 nr_wakeups_local; |
1136 | u64 nr_wakeups_remote; |
1137 | u64 nr_wakeups_affine; |
1138 | u64 nr_wakeups_affine_attempts; |
1139 | u64 nr_wakeups_passive; |
1140 | u64 nr_wakeups_idle; |
1141 | #endif |
1142 | |
1143 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1144 | struct sched_entity *parent; |
1145 | /* rq on which this entity is (to be) queued: */ |
1146 | struct cfs_rq *cfs_rq; |
1147 | /* rq "owned" by this entity/group: */ |
1148 | struct cfs_rq *my_q; |
1149 | #endif |
1150 | }; |
1151 | |
1152 | struct sched_rt_entity { |
1153 | struct list_head run_list; |
1154 | unsigned long timeout; |
1155 | unsigned int time_slice; |
1156 | int nr_cpus_allowed; |
1157 | |
1158 | struct sched_rt_entity *back; |
1159 | #ifdef CONFIG_RT_GROUP_SCHED |
1160 | struct sched_rt_entity *parent; |
1161 | /* rq on which this entity is (to be) queued: */ |
1162 | struct rt_rq *rt_rq; |
1163 | /* rq "owned" by this entity/group: */ |
1164 | struct rt_rq *my_q; |
1165 | #endif |
1166 | }; |
1167 | |
1168 | struct rcu_node; |
1169 | |
1170 | struct task_struct { |
1171 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ |
1172 | void *stack; |
1173 | atomic_t usage; |
1174 | unsigned int flags; /* per process flags, defined below */ |
1175 | unsigned int ptrace; |
1176 | |
1177 | int lock_depth; /* BKL lock depth */ |
1178 | |
1179 | #ifdef CONFIG_SMP |
1180 | #ifdef __ARCH_WANT_UNLOCKED_CTXSW |
1181 | int oncpu; |
1182 | #endif |
1183 | #endif |
1184 | |
1185 | int prio, static_prio, normal_prio; |
1186 | unsigned int rt_priority; |
1187 | const struct sched_class *sched_class; |
1188 | struct sched_entity se; |
1189 | struct sched_rt_entity rt; |
1190 | |
1191 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1192 | /* list of struct preempt_notifier: */ |
1193 | struct hlist_head preempt_notifiers; |
1194 | #endif |
1195 | |
1196 | /* |
1197 | * fpu_counter contains the number of consecutive context switches |
1198 | * that the FPU is used. If this is over a threshold, the lazy fpu |
1199 | * saving becomes unlazy to save the trap. This is an unsigned char |
1200 | * so that after 256 times the counter wraps and the behavior turns |
1201 | * lazy again; this to deal with bursty apps that only use FPU for |
1202 | * a short time |
1203 | */ |
1204 | unsigned char fpu_counter; |
1205 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
1206 | unsigned int btrace_seq; |
1207 | #endif |
1208 | |
1209 | unsigned int policy; |
1210 | cpumask_t cpus_allowed; |
1211 | |
1212 | #ifdef CONFIG_TREE_PREEMPT_RCU |
1213 | int rcu_read_lock_nesting; |
1214 | char rcu_read_unlock_special; |
1215 | struct rcu_node *rcu_blocked_node; |
1216 | struct list_head rcu_node_entry; |
1217 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
1218 | |
1219 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1220 | struct sched_info sched_info; |
1221 | #endif |
1222 | |
1223 | struct list_head tasks; |
1224 | struct plist_node pushable_tasks; |
1225 | |
1226 | struct mm_struct *mm, *active_mm; |
1227 | #if defined(SPLIT_RSS_COUNTING) |
1228 | struct task_rss_stat rss_stat; |
1229 | #endif |
1230 | /* task state */ |
1231 | int exit_state; |
1232 | int exit_code, exit_signal; |
1233 | int pdeath_signal; /* The signal sent when the parent dies */ |
1234 | /* ??? */ |
1235 | unsigned int personality; |
1236 | unsigned did_exec:1; |
1237 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1238 | * execve */ |
1239 | unsigned in_iowait:1; |
1240 | |
1241 | |
1242 | /* Revert to default priority/policy when forking */ |
1243 | unsigned sched_reset_on_fork:1; |
1244 | |
1245 | pid_t pid; |
1246 | pid_t tgid; |
1247 | |
1248 | #ifdef CONFIG_CC_STACKPROTECTOR |
1249 | /* Canary value for the -fstack-protector gcc feature */ |
1250 | unsigned long stack_canary; |
1251 | #endif |
1252 | |
1253 | /* |
1254 | * pointers to (original) parent process, youngest child, younger sibling, |
1255 | * older sibling, respectively. (p->father can be replaced with |
1256 | * p->real_parent->pid) |
1257 | */ |
1258 | struct task_struct *real_parent; /* real parent process */ |
1259 | struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ |
1260 | /* |
1261 | * children/sibling forms the list of my natural children |
1262 | */ |
1263 | struct list_head children; /* list of my children */ |
1264 | struct list_head sibling; /* linkage in my parent's children list */ |
1265 | struct task_struct *group_leader; /* threadgroup leader */ |
1266 | |
1267 | /* |
1268 | * ptraced is the list of tasks this task is using ptrace on. |
1269 | * This includes both natural children and PTRACE_ATTACH targets. |
1270 | * p->ptrace_entry is p's link on the p->parent->ptraced list. |
1271 | */ |
1272 | struct list_head ptraced; |
1273 | struct list_head ptrace_entry; |
1274 | |
1275 | /* |
1276 | * This is the tracer handle for the ptrace BTS extension. |
1277 | * This field actually belongs to the ptracer task. |
1278 | */ |
1279 | struct bts_context *bts; |
1280 | |
1281 | /* PID/PID hash table linkage. */ |
1282 | struct pid_link pids[PIDTYPE_MAX]; |
1283 | struct list_head thread_group; |
1284 | |
1285 | struct completion *vfork_done; /* for vfork() */ |
1286 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ |
1287 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ |
1288 | |
1289 | cputime_t utime, stime, utimescaled, stimescaled; |
1290 | cputime_t gtime; |
1291 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
1292 | cputime_t prev_utime, prev_stime; |
1293 | #endif |
1294 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
1295 | struct timespec start_time; /* monotonic time */ |
1296 | struct timespec real_start_time; /* boot based time */ |
1297 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1298 | unsigned long min_flt, maj_flt; |
1299 | |
1300 | struct task_cputime cputime_expires; |
1301 | struct list_head cpu_timers[3]; |
1302 | |
1303 | /* process credentials */ |
1304 | const struct cred *real_cred; /* objective and real subjective task |
1305 | * credentials (COW) */ |
1306 | const struct cred *cred; /* effective (overridable) subjective task |
1307 | * credentials (COW) */ |
1308 | struct mutex cred_guard_mutex; /* guard against foreign influences on |
1309 | * credential calculations |
1310 | * (notably. ptrace) */ |
1311 | struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */ |
1312 | |
1313 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1314 | - access with [gs]et_task_comm (which lock |
1315 | it with task_lock()) |
1316 | - initialized normally by setup_new_exec */ |
1317 | /* file system info */ |
1318 | int link_count, total_link_count; |
1319 | #ifdef CONFIG_SYSVIPC |
1320 | /* ipc stuff */ |
1321 | struct sysv_sem sysvsem; |
1322 | #endif |
1323 | #ifdef CONFIG_DETECT_HUNG_TASK |
1324 | /* hung task detection */ |
1325 | unsigned long last_switch_count; |
1326 | #endif |
1327 | /* CPU-specific state of this task */ |
1328 | struct thread_struct thread; |
1329 | /* filesystem information */ |
1330 | struct fs_struct *fs; |
1331 | /* open file information */ |
1332 | struct files_struct *files; |
1333 | /* namespaces */ |
1334 | struct nsproxy *nsproxy; |
1335 | /* signal handlers */ |
1336 | struct signal_struct *signal; |
1337 | struct sighand_struct *sighand; |
1338 | |
1339 | sigset_t blocked, real_blocked; |
1340 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1341 | struct sigpending pending; |
1342 | |
1343 | unsigned long sas_ss_sp; |
1344 | size_t sas_ss_size; |
1345 | int (*notifier)(void *priv); |
1346 | void *notifier_data; |
1347 | sigset_t *notifier_mask; |
1348 | struct audit_context *audit_context; |
1349 | #ifdef CONFIG_AUDITSYSCALL |
1350 | uid_t loginuid; |
1351 | unsigned int sessionid; |
1352 | #endif |
1353 | seccomp_t seccomp; |
1354 | |
1355 | /* Thread group tracking */ |
1356 | u32 parent_exec_id; |
1357 | u32 self_exec_id; |
1358 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1359 | * mempolicy */ |
1360 | spinlock_t alloc_lock; |
1361 | |
1362 | #ifdef CONFIG_GENERIC_HARDIRQS |
1363 | /* IRQ handler threads */ |
1364 | struct irqaction *irqaction; |
1365 | #endif |
1366 | |
1367 | /* Protection of the PI data structures: */ |
1368 | raw_spinlock_t pi_lock; |
1369 | |
1370 | #ifdef CONFIG_RT_MUTEXES |
1371 | /* PI waiters blocked on a rt_mutex held by this task */ |
1372 | struct plist_head pi_waiters; |
1373 | /* Deadlock detection and priority inheritance handling */ |
1374 | struct rt_mutex_waiter *pi_blocked_on; |
1375 | #endif |
1376 | |
1377 | #ifdef CONFIG_DEBUG_MUTEXES |
1378 | /* mutex deadlock detection */ |
1379 | struct mutex_waiter *blocked_on; |
1380 | #endif |
1381 | #ifdef CONFIG_TRACE_IRQFLAGS |
1382 | unsigned int irq_events; |
1383 | unsigned long hardirq_enable_ip; |
1384 | unsigned long hardirq_disable_ip; |
1385 | unsigned int hardirq_enable_event; |
1386 | unsigned int hardirq_disable_event; |
1387 | int hardirqs_enabled; |
1388 | int hardirq_context; |
1389 | unsigned long softirq_disable_ip; |
1390 | unsigned long softirq_enable_ip; |
1391 | unsigned int softirq_disable_event; |
1392 | unsigned int softirq_enable_event; |
1393 | int softirqs_enabled; |
1394 | int softirq_context; |
1395 | #endif |
1396 | #ifdef CONFIG_LOCKDEP |
1397 | # define MAX_LOCK_DEPTH 48UL |
1398 | u64 curr_chain_key; |
1399 | int lockdep_depth; |
1400 | unsigned int lockdep_recursion; |
1401 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
1402 | gfp_t lockdep_reclaim_gfp; |
1403 | #endif |
1404 | |
1405 | /* journalling filesystem info */ |
1406 | void *journal_info; |
1407 | |
1408 | /* stacked block device info */ |
1409 | struct bio_list *bio_list; |
1410 | |
1411 | /* VM state */ |
1412 | struct reclaim_state *reclaim_state; |
1413 | |
1414 | struct backing_dev_info *backing_dev_info; |
1415 | |
1416 | struct io_context *io_context; |
1417 | |
1418 | unsigned long ptrace_message; |
1419 | siginfo_t *last_siginfo; /* For ptrace use. */ |
1420 | struct task_io_accounting ioac; |
1421 | #if defined(CONFIG_TASK_XACCT) |
1422 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1423 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ |
1424 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1425 | #endif |
1426 | #ifdef CONFIG_CPUSETS |
1427 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
1428 | int cpuset_mem_spread_rotor; |
1429 | #endif |
1430 | #ifdef CONFIG_CGROUPS |
1431 | /* Control Group info protected by css_set_lock */ |
1432 | struct css_set *cgroups; |
1433 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1434 | struct list_head cg_list; |
1435 | #endif |
1436 | #ifdef CONFIG_FUTEX |
1437 | struct robust_list_head __user *robust_list; |
1438 | #ifdef CONFIG_COMPAT |
1439 | struct compat_robust_list_head __user *compat_robust_list; |
1440 | #endif |
1441 | struct list_head pi_state_list; |
1442 | struct futex_pi_state *pi_state_cache; |
1443 | #endif |
1444 | #ifdef CONFIG_PERF_EVENTS |
1445 | struct perf_event_context *perf_event_ctxp; |
1446 | struct mutex perf_event_mutex; |
1447 | struct list_head perf_event_list; |
1448 | #endif |
1449 | #ifdef CONFIG_NUMA |
1450 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
1451 | short il_next; |
1452 | #endif |
1453 | atomic_t fs_excl; /* holding fs exclusive resources */ |
1454 | struct rcu_head rcu; |
1455 | |
1456 | /* |
1457 | * cache last used pipe for splice |
1458 | */ |
1459 | struct pipe_inode_info *splice_pipe; |
1460 | #ifdef CONFIG_TASK_DELAY_ACCT |
1461 | struct task_delay_info *delays; |
1462 | #endif |
1463 | #ifdef CONFIG_FAULT_INJECTION |
1464 | int make_it_fail; |
1465 | #endif |
1466 | struct prop_local_single dirties; |
1467 | #ifdef CONFIG_LATENCYTOP |
1468 | int latency_record_count; |
1469 | struct latency_record latency_record[LT_SAVECOUNT]; |
1470 | #endif |
1471 | /* |
1472 | * time slack values; these are used to round up poll() and |
1473 | * select() etc timeout values. These are in nanoseconds. |
1474 | */ |
1475 | unsigned long timer_slack_ns; |
1476 | unsigned long default_timer_slack_ns; |
1477 | |
1478 | struct list_head *scm_work_list; |
1479 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1480 | /* Index of current stored address in ret_stack */ |
1481 | int curr_ret_stack; |
1482 | /* Stack of return addresses for return function tracing */ |
1483 | struct ftrace_ret_stack *ret_stack; |
1484 | /* time stamp for last schedule */ |
1485 | unsigned long long ftrace_timestamp; |
1486 | /* |
1487 | * Number of functions that haven't been traced |
1488 | * because of depth overrun. |
1489 | */ |
1490 | atomic_t trace_overrun; |
1491 | /* Pause for the tracing */ |
1492 | atomic_t tracing_graph_pause; |
1493 | #endif |
1494 | #ifdef CONFIG_TRACING |
1495 | /* state flags for use by tracers */ |
1496 | unsigned long trace; |
1497 | /* bitmask of trace recursion */ |
1498 | unsigned long trace_recursion; |
1499 | #endif /* CONFIG_TRACING */ |
1500 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */ |
1501 | struct memcg_batch_info { |
1502 | int do_batch; /* incremented when batch uncharge started */ |
1503 | struct mem_cgroup *memcg; /* target memcg of uncharge */ |
1504 | unsigned long bytes; /* uncharged usage */ |
1505 | unsigned long memsw_bytes; /* uncharged mem+swap usage */ |
1506 | } memcg_batch; |
1507 | #endif |
1508 | }; |
1509 | |
1510 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
1511 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
1512 | |
1513 | /* |
1514 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT |
1515 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH |
1516 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority |
1517 | * values are inverted: lower p->prio value means higher priority. |
1518 | * |
1519 | * The MAX_USER_RT_PRIO value allows the actual maximum |
1520 | * RT priority to be separate from the value exported to |
1521 | * user-space. This allows kernel threads to set their |
1522 | * priority to a value higher than any user task. Note: |
1523 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. |
1524 | */ |
1525 | |
1526 | #define MAX_USER_RT_PRIO 100 |
1527 | #define MAX_RT_PRIO MAX_USER_RT_PRIO |
1528 | |
1529 | #define MAX_PRIO (MAX_RT_PRIO + 40) |
1530 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) |
1531 | |
1532 | static inline int rt_prio(int prio) |
1533 | { |
1534 | if (unlikely(prio < MAX_RT_PRIO)) |
1535 | return 1; |
1536 | return 0; |
1537 | } |
1538 | |
1539 | static inline int rt_task(struct task_struct *p) |
1540 | { |
1541 | return rt_prio(p->prio); |
1542 | } |
1543 | |
1544 | static inline struct pid *task_pid(struct task_struct *task) |
1545 | { |
1546 | return task->pids[PIDTYPE_PID].pid; |
1547 | } |
1548 | |
1549 | static inline struct pid *task_tgid(struct task_struct *task) |
1550 | { |
1551 | return task->group_leader->pids[PIDTYPE_PID].pid; |
1552 | } |
1553 | |
1554 | /* |
1555 | * Without tasklist or rcu lock it is not safe to dereference |
1556 | * the result of task_pgrp/task_session even if task == current, |
1557 | * we can race with another thread doing sys_setsid/sys_setpgid. |
1558 | */ |
1559 | static inline struct pid *task_pgrp(struct task_struct *task) |
1560 | { |
1561 | return task->group_leader->pids[PIDTYPE_PGID].pid; |
1562 | } |
1563 | |
1564 | static inline struct pid *task_session(struct task_struct *task) |
1565 | { |
1566 | return task->group_leader->pids[PIDTYPE_SID].pid; |
1567 | } |
1568 | |
1569 | struct pid_namespace; |
1570 | |
1571 | /* |
1572 | * the helpers to get the task's different pids as they are seen |
1573 | * from various namespaces |
1574 | * |
1575 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; |
1576 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1577 | * current. |
1578 | * task_xid_nr_ns() : id seen from the ns specified; |
1579 | * |
1580 | * set_task_vxid() : assigns a virtual id to a task; |
1581 | * |
1582 | * see also pid_nr() etc in include/linux/pid.h |
1583 | */ |
1584 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1585 | struct pid_namespace *ns); |
1586 | |
1587 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
1588 | { |
1589 | return tsk->pid; |
1590 | } |
1591 | |
1592 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1593 | struct pid_namespace *ns) |
1594 | { |
1595 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); |
1596 | } |
1597 | |
1598 | static inline pid_t task_pid_vnr(struct task_struct *tsk) |
1599 | { |
1600 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
1601 | } |
1602 | |
1603 | |
1604 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
1605 | { |
1606 | return tsk->tgid; |
1607 | } |
1608 | |
1609 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
1610 | |
1611 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) |
1612 | { |
1613 | return pid_vnr(task_tgid(tsk)); |
1614 | } |
1615 | |
1616 | |
1617 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1618 | struct pid_namespace *ns) |
1619 | { |
1620 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
1621 | } |
1622 | |
1623 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1624 | { |
1625 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
1626 | } |
1627 | |
1628 | |
1629 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1630 | struct pid_namespace *ns) |
1631 | { |
1632 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
1633 | } |
1634 | |
1635 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1636 | { |
1637 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
1638 | } |
1639 | |
1640 | /* obsolete, do not use */ |
1641 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) |
1642 | { |
1643 | return task_pgrp_nr_ns(tsk, &init_pid_ns); |
1644 | } |
1645 | |
1646 | /** |
1647 | * pid_alive - check that a task structure is not stale |
1648 | * @p: Task structure to be checked. |
1649 | * |
1650 | * Test if a process is not yet dead (at most zombie state) |
1651 | * If pid_alive fails, then pointers within the task structure |
1652 | * can be stale and must not be dereferenced. |
1653 | */ |
1654 | static inline int pid_alive(struct task_struct *p) |
1655 | { |
1656 | return p->pids[PIDTYPE_PID].pid != NULL; |
1657 | } |
1658 | |
1659 | /** |
1660 | * is_global_init - check if a task structure is init |
1661 | * @tsk: Task structure to be checked. |
1662 | * |
1663 | * Check if a task structure is the first user space task the kernel created. |
1664 | */ |
1665 | static inline int is_global_init(struct task_struct *tsk) |
1666 | { |
1667 | return tsk->pid == 1; |
1668 | } |
1669 | |
1670 | /* |
1671 | * is_container_init: |
1672 | * check whether in the task is init in its own pid namespace. |
1673 | */ |
1674 | extern int is_container_init(struct task_struct *tsk); |
1675 | |
1676 | extern struct pid *cad_pid; |
1677 | |
1678 | extern void free_task(struct task_struct *tsk); |
1679 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
1680 | |
1681 | extern void __put_task_struct(struct task_struct *t); |
1682 | |
1683 | static inline void put_task_struct(struct task_struct *t) |
1684 | { |
1685 | if (atomic_dec_and_test(&t->usage)) |
1686 | __put_task_struct(t); |
1687 | } |
1688 | |
1689 | extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
1690 | extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
1691 | |
1692 | /* |
1693 | * Per process flags |
1694 | */ |
1695 | #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ |
1696 | /* Not implemented yet, only for 486*/ |
1697 | #define PF_STARTING 0x00000002 /* being created */ |
1698 | #define PF_EXITING 0x00000004 /* getting shut down */ |
1699 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
1700 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
1701 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
1702 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1703 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
1704 | #define PF_DUMPCORE 0x00000200 /* dumped core */ |
1705 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ |
1706 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ |
1707 | #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ |
1708 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
1709 | #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */ |
1710 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1711 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ |
1712 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ |
1713 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ |
1714 | #define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */ |
1715 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
1716 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
1717 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1718 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ |
1719 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ |
1720 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ |
1721 | #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ |
1722 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
1723 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
1724 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
1725 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ |
1726 | #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ |
1727 | |
1728 | /* |
1729 | * Only the _current_ task can read/write to tsk->flags, but other |
1730 | * tasks can access tsk->flags in readonly mode for example |
1731 | * with tsk_used_math (like during threaded core dumping). |
1732 | * There is however an exception to this rule during ptrace |
1733 | * or during fork: the ptracer task is allowed to write to the |
1734 | * child->flags of its traced child (same goes for fork, the parent |
1735 | * can write to the child->flags), because we're guaranteed the |
1736 | * child is not running and in turn not changing child->flags |
1737 | * at the same time the parent does it. |
1738 | */ |
1739 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) |
1740 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) |
1741 | #define clear_used_math() clear_stopped_child_used_math(current) |
1742 | #define set_used_math() set_stopped_child_used_math(current) |
1743 | #define conditional_stopped_child_used_math(condition, child) \ |
1744 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) |
1745 | #define conditional_used_math(condition) \ |
1746 | conditional_stopped_child_used_math(condition, current) |
1747 | #define copy_to_stopped_child_used_math(child) \ |
1748 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) |
1749 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ |
1750 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) |
1751 | #define used_math() tsk_used_math(current) |
1752 | |
1753 | #ifdef CONFIG_TREE_PREEMPT_RCU |
1754 | |
1755 | #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ |
1756 | #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ |
1757 | |
1758 | static inline void rcu_copy_process(struct task_struct *p) |
1759 | { |
1760 | p->rcu_read_lock_nesting = 0; |
1761 | p->rcu_read_unlock_special = 0; |
1762 | p->rcu_blocked_node = NULL; |
1763 | INIT_LIST_HEAD(&p->rcu_node_entry); |
1764 | } |
1765 | |
1766 | #else |
1767 | |
1768 | static inline void rcu_copy_process(struct task_struct *p) |
1769 | { |
1770 | } |
1771 | |
1772 | #endif |
1773 | |
1774 | #ifdef CONFIG_SMP |
1775 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
1776 | const struct cpumask *new_mask); |
1777 | #else |
1778 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
1779 | const struct cpumask *new_mask) |
1780 | { |
1781 | if (!cpumask_test_cpu(0, new_mask)) |
1782 | return -EINVAL; |
1783 | return 0; |
1784 | } |
1785 | #endif |
1786 | |
1787 | #ifndef CONFIG_CPUMASK_OFFSTACK |
1788 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
1789 | { |
1790 | return set_cpus_allowed_ptr(p, &new_mask); |
1791 | } |
1792 | #endif |
1793 | |
1794 | /* |
1795 | * Architectures can set this to 1 if they have specified |
1796 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, |
1797 | * but then during bootup it turns out that sched_clock() |
1798 | * is reliable after all: |
1799 | */ |
1800 | #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
1801 | extern int sched_clock_stable; |
1802 | #endif |
1803 | |
1804 | /* ftrace calls sched_clock() directly */ |
1805 | extern unsigned long long notrace sched_clock(void); |
1806 | |
1807 | extern void sched_clock_init(void); |
1808 | extern u64 sched_clock_cpu(int cpu); |
1809 | |
1810 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
1811 | static inline void sched_clock_tick(void) |
1812 | { |
1813 | } |
1814 | |
1815 | static inline void sched_clock_idle_sleep_event(void) |
1816 | { |
1817 | } |
1818 | |
1819 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) |
1820 | { |
1821 | } |
1822 | #else |
1823 | extern void sched_clock_tick(void); |
1824 | extern void sched_clock_idle_sleep_event(void); |
1825 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); |
1826 | #endif |
1827 | |
1828 | /* |
1829 | * For kernel-internal use: high-speed (but slightly incorrect) per-cpu |
1830 | * clock constructed from sched_clock(): |
1831 | */ |
1832 | extern unsigned long long cpu_clock(int cpu); |
1833 | |
1834 | extern unsigned long long |
1835 | task_sched_runtime(struct task_struct *task); |
1836 | extern unsigned long long thread_group_sched_runtime(struct task_struct *task); |
1837 | |
1838 | /* sched_exec is called by processes performing an exec */ |
1839 | #ifdef CONFIG_SMP |
1840 | extern void sched_exec(void); |
1841 | #else |
1842 | #define sched_exec() {} |
1843 | #endif |
1844 | |
1845 | extern void sched_clock_idle_sleep_event(void); |
1846 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); |
1847 | |
1848 | #ifdef CONFIG_HOTPLUG_CPU |
1849 | extern void idle_task_exit(void); |
1850 | #else |
1851 | static inline void idle_task_exit(void) {} |
1852 | #endif |
1853 | |
1854 | extern void sched_idle_next(void); |
1855 | |
1856 | #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) |
1857 | extern void wake_up_idle_cpu(int cpu); |
1858 | #else |
1859 | static inline void wake_up_idle_cpu(int cpu) { } |
1860 | #endif |
1861 | |
1862 | extern unsigned int sysctl_sched_latency; |
1863 | extern unsigned int sysctl_sched_min_granularity; |
1864 | extern unsigned int sysctl_sched_wakeup_granularity; |
1865 | extern unsigned int sysctl_sched_shares_ratelimit; |
1866 | extern unsigned int sysctl_sched_shares_thresh; |
1867 | extern unsigned int sysctl_sched_child_runs_first; |
1868 | |
1869 | enum sched_tunable_scaling { |
1870 | SCHED_TUNABLESCALING_NONE, |
1871 | SCHED_TUNABLESCALING_LOG, |
1872 | SCHED_TUNABLESCALING_LINEAR, |
1873 | SCHED_TUNABLESCALING_END, |
1874 | }; |
1875 | extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; |
1876 | |
1877 | #ifdef CONFIG_SCHED_DEBUG |
1878 | extern unsigned int sysctl_sched_migration_cost; |
1879 | extern unsigned int sysctl_sched_nr_migrate; |
1880 | extern unsigned int sysctl_sched_time_avg; |
1881 | extern unsigned int sysctl_timer_migration; |
1882 | |
1883 | int sched_proc_update_handler(struct ctl_table *table, int write, |
1884 | void __user *buffer, size_t *length, |
1885 | loff_t *ppos); |
1886 | #endif |
1887 | #ifdef CONFIG_SCHED_DEBUG |
1888 | static inline unsigned int get_sysctl_timer_migration(void) |
1889 | { |
1890 | return sysctl_timer_migration; |
1891 | } |
1892 | #else |
1893 | static inline unsigned int get_sysctl_timer_migration(void) |
1894 | { |
1895 | return 1; |
1896 | } |
1897 | #endif |
1898 | extern unsigned int sysctl_sched_rt_period; |
1899 | extern int sysctl_sched_rt_runtime; |
1900 | |
1901 | int sched_rt_handler(struct ctl_table *table, int write, |
1902 | void __user *buffer, size_t *lenp, |
1903 | loff_t *ppos); |
1904 | |
1905 | extern unsigned int sysctl_sched_compat_yield; |
1906 | |
1907 | #ifdef CONFIG_RT_MUTEXES |
1908 | extern int rt_mutex_getprio(struct task_struct *p); |
1909 | extern void rt_mutex_setprio(struct task_struct *p, int prio); |
1910 | extern void rt_mutex_adjust_pi(struct task_struct *p); |
1911 | #else |
1912 | static inline int rt_mutex_getprio(struct task_struct *p) |
1913 | { |
1914 | return p->normal_prio; |
1915 | } |
1916 | # define rt_mutex_adjust_pi(p) do { } while (0) |
1917 | #endif |
1918 | |
1919 | extern void set_user_nice(struct task_struct *p, long nice); |
1920 | extern int task_prio(const struct task_struct *p); |
1921 | extern int task_nice(const struct task_struct *p); |
1922 | extern int can_nice(const struct task_struct *p, const int nice); |
1923 | extern int task_curr(const struct task_struct *p); |
1924 | extern int idle_cpu(int cpu); |
1925 | extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); |
1926 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
1927 | struct sched_param *); |
1928 | extern struct task_struct *idle_task(int cpu); |
1929 | extern struct task_struct *curr_task(int cpu); |
1930 | extern void set_curr_task(int cpu, struct task_struct *p); |
1931 | |
1932 | void yield(void); |
1933 | |
1934 | /* |
1935 | * The default (Linux) execution domain. |
1936 | */ |
1937 | extern struct exec_domain default_exec_domain; |
1938 | |
1939 | union thread_union { |
1940 | struct thread_info thread_info; |
1941 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
1942 | }; |
1943 | |
1944 | #ifndef __HAVE_ARCH_KSTACK_END |
1945 | static inline int kstack_end(void *addr) |
1946 | { |
1947 | /* Reliable end of stack detection: |
1948 | * Some APM bios versions misalign the stack |
1949 | */ |
1950 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); |
1951 | } |
1952 | #endif |
1953 | |
1954 | extern union thread_union init_thread_union; |
1955 | extern struct task_struct init_task; |
1956 | |
1957 | extern struct mm_struct init_mm; |
1958 | |
1959 | extern struct pid_namespace init_pid_ns; |
1960 | |
1961 | /* |
1962 | * find a task by one of its numerical ids |
1963 | * |
1964 | * find_task_by_pid_ns(): |
1965 | * finds a task by its pid in the specified namespace |
1966 | * find_task_by_vpid(): |
1967 | * finds a task by its virtual pid |
1968 | * |
1969 | * see also find_vpid() etc in include/linux/pid.h |
1970 | */ |
1971 | |
1972 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
1973 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, |
1974 | struct pid_namespace *ns); |
1975 | |
1976 | extern void __set_special_pids(struct pid *pid); |
1977 | |
1978 | /* per-UID process charging. */ |
1979 | extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); |
1980 | static inline struct user_struct *get_uid(struct user_struct *u) |
1981 | { |
1982 | atomic_inc(&u->__count); |
1983 | return u; |
1984 | } |
1985 | extern void free_uid(struct user_struct *); |
1986 | extern void release_uids(struct user_namespace *ns); |
1987 | |
1988 | #include <asm/current.h> |
1989 | |
1990 | extern void do_timer(unsigned long ticks); |
1991 | |
1992 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
1993 | extern int wake_up_process(struct task_struct *tsk); |
1994 | extern void wake_up_new_task(struct task_struct *tsk, |
1995 | unsigned long clone_flags); |
1996 | #ifdef CONFIG_SMP |
1997 | extern void kick_process(struct task_struct *tsk); |
1998 | #else |
1999 | static inline void kick_process(struct task_struct *tsk) { } |
2000 | #endif |
2001 | extern void sched_fork(struct task_struct *p, int clone_flags); |
2002 | extern void sched_dead(struct task_struct *p); |
2003 | |
2004 | extern void proc_caches_init(void); |
2005 | extern void flush_signals(struct task_struct *); |
2006 | extern void __flush_signals(struct task_struct *); |
2007 | extern void ignore_signals(struct task_struct *); |
2008 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
2009 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); |
2010 | |
2011 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) |
2012 | { |
2013 | unsigned long flags; |
2014 | int ret; |
2015 | |
2016 | spin_lock_irqsave(&tsk->sighand->siglock, flags); |
2017 | ret = dequeue_signal(tsk, mask, info); |
2018 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
2019 | |
2020 | return ret; |
2021 | } |
2022 | |
2023 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, |
2024 | sigset_t *mask); |
2025 | extern void unblock_all_signals(void); |
2026 | extern void release_task(struct task_struct * p); |
2027 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); |
2028 | extern int force_sigsegv(int, struct task_struct *); |
2029 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); |
2030 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
2031 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
2032 | extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); |
2033 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2034 | extern int kill_pid(struct pid *pid, int sig, int priv); |
2035 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
2036 | extern int do_notify_parent(struct task_struct *, int); |
2037 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
2038 | extern void force_sig(int, struct task_struct *); |
2039 | extern int send_sig(int, struct task_struct *, int); |
2040 | extern void zap_other_threads(struct task_struct *p); |
2041 | extern struct sigqueue *sigqueue_alloc(void); |
2042 | extern void sigqueue_free(struct sigqueue *); |
2043 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
2044 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
2045 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
2046 | |
2047 | static inline int kill_cad_pid(int sig, int priv) |
2048 | { |
2049 | return kill_pid(cad_pid, sig, priv); |
2050 | } |
2051 | |
2052 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2053 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) |
2054 | #define SEND_SIG_PRIV ((struct siginfo *) 1) |
2055 | #define SEND_SIG_FORCED ((struct siginfo *) 2) |
2056 | |
2057 | /* |
2058 | * True if we are on the alternate signal stack. |
2059 | */ |
2060 | static inline int on_sig_stack(unsigned long sp) |
2061 | { |
2062 | #ifdef CONFIG_STACK_GROWSUP |
2063 | return sp >= current->sas_ss_sp && |
2064 | sp - current->sas_ss_sp < current->sas_ss_size; |
2065 | #else |
2066 | return sp > current->sas_ss_sp && |
2067 | sp - current->sas_ss_sp <= current->sas_ss_size; |
2068 | #endif |
2069 | } |
2070 | |
2071 | static inline int sas_ss_flags(unsigned long sp) |
2072 | { |
2073 | return (current->sas_ss_size == 0 ? SS_DISABLE |
2074 | : on_sig_stack(sp) ? SS_ONSTACK : 0); |
2075 | } |
2076 | |
2077 | /* |
2078 | * Routines for handling mm_structs |
2079 | */ |
2080 | extern struct mm_struct * mm_alloc(void); |
2081 | |
2082 | /* mmdrop drops the mm and the page tables */ |
2083 | extern void __mmdrop(struct mm_struct *); |
2084 | static inline void mmdrop(struct mm_struct * mm) |
2085 | { |
2086 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
2087 | __mmdrop(mm); |
2088 | } |
2089 | |
2090 | /* mmput gets rid of the mappings and all user-space */ |
2091 | extern void mmput(struct mm_struct *); |
2092 | /* Grab a reference to a task's mm, if it is not already going away */ |
2093 | extern struct mm_struct *get_task_mm(struct task_struct *task); |
2094 | /* Remove the current tasks stale references to the old mm_struct */ |
2095 | extern void mm_release(struct task_struct *, struct mm_struct *); |
2096 | /* Allocate a new mm structure and copy contents from tsk->mm */ |
2097 | extern struct mm_struct *dup_mm(struct task_struct *tsk); |
2098 | |
2099 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
2100 | struct task_struct *, struct pt_regs *); |
2101 | extern void flush_thread(void); |
2102 | extern void exit_thread(void); |
2103 | |
2104 | extern void exit_files(struct task_struct *); |
2105 | extern void __cleanup_signal(struct signal_struct *); |
2106 | extern void __cleanup_sighand(struct sighand_struct *); |
2107 | |
2108 | extern void exit_itimers(struct signal_struct *); |
2109 | extern void flush_itimer_signals(void); |
2110 | |
2111 | extern NORET_TYPE void do_group_exit(int); |
2112 | |
2113 | extern void daemonize(const char *, ...); |
2114 | extern int allow_signal(int); |
2115 | extern int disallow_signal(int); |
2116 | |
2117 | extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); |
2118 | extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); |
2119 | struct task_struct *fork_idle(int); |
2120 | |
2121 | extern void set_task_comm(struct task_struct *tsk, char *from); |
2122 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
2123 | |
2124 | #ifdef CONFIG_SMP |
2125 | extern void wait_task_context_switch(struct task_struct *p); |
2126 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
2127 | #else |
2128 | static inline void wait_task_context_switch(struct task_struct *p) {} |
2129 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2130 | long match_state) |
2131 | { |
2132 | return 1; |
2133 | } |
2134 | #endif |
2135 | |
2136 | #define next_task(p) \ |
2137 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) |
2138 | |
2139 | #define for_each_process(p) \ |
2140 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) |
2141 | |
2142 | extern bool current_is_single_threaded(void); |
2143 | |
2144 | /* |
2145 | * Careful: do_each_thread/while_each_thread is a double loop so |
2146 | * 'break' will not work as expected - use goto instead. |
2147 | */ |
2148 | #define do_each_thread(g, t) \ |
2149 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do |
2150 | |
2151 | #define while_each_thread(g, t) \ |
2152 | while ((t = next_thread(t)) != g) |
2153 | |
2154 | /* de_thread depends on thread_group_leader not being a pid based check */ |
2155 | #define thread_group_leader(p) (p == p->group_leader) |
2156 | |
2157 | /* Do to the insanities of de_thread it is possible for a process |
2158 | * to have the pid of the thread group leader without actually being |
2159 | * the thread group leader. For iteration through the pids in proc |
2160 | * all we care about is that we have a task with the appropriate |
2161 | * pid, we don't actually care if we have the right task. |
2162 | */ |
2163 | static inline int has_group_leader_pid(struct task_struct *p) |
2164 | { |
2165 | return p->pid == p->tgid; |
2166 | } |
2167 | |
2168 | static inline |
2169 | int same_thread_group(struct task_struct *p1, struct task_struct *p2) |
2170 | { |
2171 | return p1->tgid == p2->tgid; |
2172 | } |
2173 | |
2174 | static inline struct task_struct *next_thread(const struct task_struct *p) |
2175 | { |
2176 | return list_entry_rcu(p->thread_group.next, |
2177 | struct task_struct, thread_group); |
2178 | } |
2179 | |
2180 | static inline int thread_group_empty(struct task_struct *p) |
2181 | { |
2182 | return list_empty(&p->thread_group); |
2183 | } |
2184 | |
2185 | #define delay_group_leader(p) \ |
2186 | (thread_group_leader(p) && !thread_group_empty(p)) |
2187 | |
2188 | static inline int task_detached(struct task_struct *p) |
2189 | { |
2190 | return p->exit_signal == -1; |
2191 | } |
2192 | |
2193 | /* |
2194 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
2195 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
2196 | * pins the final release of task.io_context. Also protects ->cpuset and |
2197 | * ->cgroup.subsys[]. |
2198 | * |
2199 | * Nests both inside and outside of read_lock(&tasklist_lock). |
2200 | * It must not be nested with write_lock_irq(&tasklist_lock), |
2201 | * neither inside nor outside. |
2202 | */ |
2203 | static inline void task_lock(struct task_struct *p) |
2204 | { |
2205 | spin_lock(&p->alloc_lock); |
2206 | } |
2207 | |
2208 | static inline void task_unlock(struct task_struct *p) |
2209 | { |
2210 | spin_unlock(&p->alloc_lock); |
2211 | } |
2212 | |
2213 | extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
2214 | unsigned long *flags); |
2215 | |
2216 | static inline void unlock_task_sighand(struct task_struct *tsk, |
2217 | unsigned long *flags) |
2218 | { |
2219 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); |
2220 | } |
2221 | |
2222 | #ifndef __HAVE_THREAD_FUNCTIONS |
2223 | |
2224 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2225 | #define task_stack_page(task) ((task)->stack) |
2226 | |
2227 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2228 | { |
2229 | *task_thread_info(p) = *task_thread_info(org); |
2230 | task_thread_info(p)->task = p; |
2231 | } |
2232 | |
2233 | static inline unsigned long *end_of_stack(struct task_struct *p) |
2234 | { |
2235 | return (unsigned long *)(task_thread_info(p) + 1); |
2236 | } |
2237 | |
2238 | #endif |
2239 | |
2240 | static inline int object_is_on_stack(void *obj) |
2241 | { |
2242 | void *stack = task_stack_page(current); |
2243 | |
2244 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); |
2245 | } |
2246 | |
2247 | extern void thread_info_cache_init(void); |
2248 | |
2249 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2250 | static inline unsigned long stack_not_used(struct task_struct *p) |
2251 | { |
2252 | unsigned long *n = end_of_stack(p); |
2253 | |
2254 | do { /* Skip over canary */ |
2255 | n++; |
2256 | } while (!*n); |
2257 | |
2258 | return (unsigned long)n - (unsigned long)end_of_stack(p); |
2259 | } |
2260 | #endif |
2261 | |
2262 | /* set thread flags in other task's structures |
2263 | * - see asm/thread_info.h for TIF_xxxx flags available |
2264 | */ |
2265 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) |
2266 | { |
2267 | set_ti_thread_flag(task_thread_info(tsk), flag); |
2268 | } |
2269 | |
2270 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
2271 | { |
2272 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
2273 | } |
2274 | |
2275 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
2276 | { |
2277 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
2278 | } |
2279 | |
2280 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
2281 | { |
2282 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
2283 | } |
2284 | |
2285 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) |
2286 | { |
2287 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
2288 | } |
2289 | |
2290 | static inline void set_tsk_need_resched(struct task_struct *tsk) |
2291 | { |
2292 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
2293 | } |
2294 | |
2295 | static inline void clear_tsk_need_resched(struct task_struct *tsk) |
2296 | { |
2297 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
2298 | } |
2299 | |
2300 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2301 | { |
2302 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); |
2303 | } |
2304 | |
2305 | static inline int restart_syscall(void) |
2306 | { |
2307 | set_tsk_thread_flag(current, TIF_SIGPENDING); |
2308 | return -ERESTARTNOINTR; |
2309 | } |
2310 | |
2311 | static inline int signal_pending(struct task_struct *p) |
2312 | { |
2313 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); |
2314 | } |
2315 | |
2316 | static inline int __fatal_signal_pending(struct task_struct *p) |
2317 | { |
2318 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); |
2319 | } |
2320 | |
2321 | static inline int fatal_signal_pending(struct task_struct *p) |
2322 | { |
2323 | return signal_pending(p) && __fatal_signal_pending(p); |
2324 | } |
2325 | |
2326 | static inline int signal_pending_state(long state, struct task_struct *p) |
2327 | { |
2328 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) |
2329 | return 0; |
2330 | if (!signal_pending(p)) |
2331 | return 0; |
2332 | |
2333 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2334 | } |
2335 | |
2336 | static inline int need_resched(void) |
2337 | { |
2338 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
2339 | } |
2340 | |
2341 | /* |
2342 | * cond_resched() and cond_resched_lock(): latency reduction via |
2343 | * explicit rescheduling in places that are safe. The return |
2344 | * value indicates whether a reschedule was done in fact. |
2345 | * cond_resched_lock() will drop the spinlock before scheduling, |
2346 | * cond_resched_softirq() will enable bhs before scheduling. |
2347 | */ |
2348 | extern int _cond_resched(void); |
2349 | |
2350 | #define cond_resched() ({ \ |
2351 | __might_sleep(__FILE__, __LINE__, 0); \ |
2352 | _cond_resched(); \ |
2353 | }) |
2354 | |
2355 | extern int __cond_resched_lock(spinlock_t *lock); |
2356 | |
2357 | #ifdef CONFIG_PREEMPT |
2358 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET |
2359 | #else |
2360 | #define PREEMPT_LOCK_OFFSET 0 |
2361 | #endif |
2362 | |
2363 | #define cond_resched_lock(lock) ({ \ |
2364 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ |
2365 | __cond_resched_lock(lock); \ |
2366 | }) |
2367 | |
2368 | extern int __cond_resched_softirq(void); |
2369 | |
2370 | #define cond_resched_softirq() ({ \ |
2371 | __might_sleep(__FILE__, __LINE__, SOFTIRQ_OFFSET); \ |
2372 | __cond_resched_softirq(); \ |
2373 | }) |
2374 | |
2375 | /* |
2376 | * Does a critical section need to be broken due to another |
2377 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2378 | * but a general need for low latency) |
2379 | */ |
2380 | static inline int spin_needbreak(spinlock_t *lock) |
2381 | { |
2382 | #ifdef CONFIG_PREEMPT |
2383 | return spin_is_contended(lock); |
2384 | #else |
2385 | return 0; |
2386 | #endif |
2387 | } |
2388 | |
2389 | /* |
2390 | * Thread group CPU time accounting. |
2391 | */ |
2392 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
2393 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
2394 | |
2395 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
2396 | { |
2397 | spin_lock_init(&sig->cputimer.lock); |
2398 | } |
2399 | |
2400 | static inline void thread_group_cputime_free(struct signal_struct *sig) |
2401 | { |
2402 | } |
2403 | |
2404 | /* |
2405 | * Reevaluate whether the task has signals pending delivery. |
2406 | * Wake the task if so. |
2407 | * This is required every time the blocked sigset_t changes. |
2408 | * callers must hold sighand->siglock. |
2409 | */ |
2410 | extern void recalc_sigpending_and_wake(struct task_struct *t); |
2411 | extern void recalc_sigpending(void); |
2412 | |
2413 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); |
2414 | |
2415 | /* |
2416 | * Wrappers for p->thread_info->cpu access. No-op on UP. |
2417 | */ |
2418 | #ifdef CONFIG_SMP |
2419 | |
2420 | static inline unsigned int task_cpu(const struct task_struct *p) |
2421 | { |
2422 | return task_thread_info(p)->cpu; |
2423 | } |
2424 | |
2425 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
2426 | |
2427 | #else |
2428 | |
2429 | static inline unsigned int task_cpu(const struct task_struct *p) |
2430 | { |
2431 | return 0; |
2432 | } |
2433 | |
2434 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) |
2435 | { |
2436 | } |
2437 | |
2438 | #endif /* CONFIG_SMP */ |
2439 | |
2440 | #ifdef CONFIG_TRACING |
2441 | extern void |
2442 | __trace_special(void *__tr, void *__data, |
2443 | unsigned long arg1, unsigned long arg2, unsigned long arg3); |
2444 | #else |
2445 | static inline void |
2446 | __trace_special(void *__tr, void *__data, |
2447 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
2448 | { |
2449 | } |
2450 | #endif |
2451 | |
2452 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2453 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); |
2454 | |
2455 | extern void normalize_rt_tasks(void); |
2456 | |
2457 | #ifdef CONFIG_CGROUP_SCHED |
2458 | |
2459 | extern struct task_group init_task_group; |
2460 | |
2461 | extern struct task_group *sched_create_group(struct task_group *parent); |
2462 | extern void sched_destroy_group(struct task_group *tg); |
2463 | extern void sched_move_task(struct task_struct *tsk); |
2464 | #ifdef CONFIG_FAIR_GROUP_SCHED |
2465 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); |
2466 | extern unsigned long sched_group_shares(struct task_group *tg); |
2467 | #endif |
2468 | #ifdef CONFIG_RT_GROUP_SCHED |
2469 | extern int sched_group_set_rt_runtime(struct task_group *tg, |
2470 | long rt_runtime_us); |
2471 | extern long sched_group_rt_runtime(struct task_group *tg); |
2472 | extern int sched_group_set_rt_period(struct task_group *tg, |
2473 | long rt_period_us); |
2474 | extern long sched_group_rt_period(struct task_group *tg); |
2475 | extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); |
2476 | #endif |
2477 | #endif |
2478 | |
2479 | extern int task_can_switch_user(struct user_struct *up, |
2480 | struct task_struct *tsk); |
2481 | |
2482 | #ifdef CONFIG_TASK_XACCT |
2483 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) |
2484 | { |
2485 | tsk->ioac.rchar += amt; |
2486 | } |
2487 | |
2488 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) |
2489 | { |
2490 | tsk->ioac.wchar += amt; |
2491 | } |
2492 | |
2493 | static inline void inc_syscr(struct task_struct *tsk) |
2494 | { |
2495 | tsk->ioac.syscr++; |
2496 | } |
2497 | |
2498 | static inline void inc_syscw(struct task_struct *tsk) |
2499 | { |
2500 | tsk->ioac.syscw++; |
2501 | } |
2502 | #else |
2503 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) |
2504 | { |
2505 | } |
2506 | |
2507 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) |
2508 | { |
2509 | } |
2510 | |
2511 | static inline void inc_syscr(struct task_struct *tsk) |
2512 | { |
2513 | } |
2514 | |
2515 | static inline void inc_syscw(struct task_struct *tsk) |
2516 | { |
2517 | } |
2518 | #endif |
2519 | |
2520 | #ifndef TASK_SIZE_OF |
2521 | #define TASK_SIZE_OF(tsk) TASK_SIZE |
2522 | #endif |
2523 | |
2524 | /* |
2525 | * Call the function if the target task is executing on a CPU right now: |
2526 | */ |
2527 | extern void task_oncpu_function_call(struct task_struct *p, |
2528 | void (*func) (void *info), void *info); |
2529 | |
2530 | |
2531 | #ifdef CONFIG_MM_OWNER |
2532 | extern void mm_update_next_owner(struct mm_struct *mm); |
2533 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); |
2534 | #else |
2535 | static inline void mm_update_next_owner(struct mm_struct *mm) |
2536 | { |
2537 | } |
2538 | |
2539 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) |
2540 | { |
2541 | } |
2542 | #endif /* CONFIG_MM_OWNER */ |
2543 | |
2544 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
2545 | unsigned int limit) |
2546 | { |
2547 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); |
2548 | } |
2549 | |
2550 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, |
2551 | unsigned int limit) |
2552 | { |
2553 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); |
2554 | } |
2555 | |
2556 | static inline unsigned long rlimit(unsigned int limit) |
2557 | { |
2558 | return task_rlimit(current, limit); |
2559 | } |
2560 | |
2561 | static inline unsigned long rlimit_max(unsigned int limit) |
2562 | { |
2563 | return task_rlimit_max(current, limit); |
2564 | } |
2565 | |
2566 | #endif /* __KERNEL__ */ |
2567 | |
2568 | #endif |
2569 |
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