]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef _LINUX_SCHED_H |
2 | #define _LINUX_SCHED_H | |
3 | ||
607ca46e | 4 | #include <uapi/linux/sched.h> |
b7b3c76a | 5 | |
5c228079 DY |
6 | #include <linux/sched/prio.h> |
7 | ||
b69339ba | 8 | #include <linux/mutex.h> |
fb00aca4 | 9 | #include <linux/plist.h> |
77ba809e | 10 | #include <linux/mm_types_task.h> |
1da177e4 | 11 | #include <asm/ptrace.h> |
1da177e4 | 12 | |
1da177e4 | 13 | #include <linux/sem.h> |
ab602f79 | 14 | #include <linux/shm.h> |
1da177e4 | 15 | #include <linux/signal.h> |
f361bf4a | 16 | #include <linux/signal_types.h> |
1da177e4 | 17 | #include <linux/pid.h> |
1da177e4 | 18 | #include <linux/seccomp.h> |
05725f7e | 19 | #include <linux/rculist.h> |
23f78d4a | 20 | #include <linux/rtmutex.h> |
1da177e4 | 21 | |
a3b6714e | 22 | #include <linux/resource.h> |
a3b6714e | 23 | #include <linux/hrtimer.h> |
5c9a8750 | 24 | #include <linux/kcov.h> |
7c3ab738 | 25 | #include <linux/task_io_accounting.h> |
9745512c | 26 | #include <linux/latencytop.h> |
9e2b2dc4 | 27 | #include <linux/cred.h> |
21caf2fc | 28 | #include <linux/gfp.h> |
fd771233 | 29 | #include <linux/topology.h> |
d4311ff1 | 30 | #include <linux/magic.h> |
a3b6714e | 31 | |
70b8157e IM |
32 | #include <asm/current.h> |
33 | ||
c7af7877 IM |
34 | /* task_struct member predeclarations: */ |
35 | struct audit_context; | |
36 | struct autogroup; | |
37 | struct backing_dev_info; | |
bddd87c7 | 38 | struct bio_list; |
73c10101 | 39 | struct blk_plug; |
c7af7877 | 40 | struct cfs_rq; |
c4ad8f98 | 41 | struct filename; |
c7af7877 IM |
42 | struct fs_struct; |
43 | struct futex_pi_state; | |
44 | struct io_context; | |
45 | struct mempolicy; | |
89076bc3 | 46 | struct nameidata; |
c7af7877 IM |
47 | struct nsproxy; |
48 | struct perf_event_context; | |
49 | struct pid_namespace; | |
50 | struct pipe_inode_info; | |
51 | struct rcu_node; | |
52 | struct reclaim_state; | |
53 | struct robust_list_head; | |
54 | struct sched_attr; | |
55 | struct sched_param; | |
43ae34cb | 56 | struct seq_file; |
c7af7877 IM |
57 | struct sighand_struct; |
58 | struct signal_struct; | |
59 | struct task_delay_info; | |
4cf86d77 | 60 | struct task_group; |
c7af7877 IM |
61 | struct task_struct; |
62 | struct uts_namespace; | |
1da177e4 | 63 | |
4a8342d2 LT |
64 | /* |
65 | * Task state bitmask. NOTE! These bits are also | |
66 | * encoded in fs/proc/array.c: get_task_state(). | |
67 | * | |
68 | * We have two separate sets of flags: task->state | |
69 | * is about runnability, while task->exit_state are | |
70 | * about the task exiting. Confusing, but this way | |
71 | * modifying one set can't modify the other one by | |
72 | * mistake. | |
73 | */ | |
1da177e4 LT |
74 | #define TASK_RUNNING 0 |
75 | #define TASK_INTERRUPTIBLE 1 | |
76 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
77 | #define __TASK_STOPPED 4 |
78 | #define __TASK_TRACED 8 | |
4a8342d2 | 79 | /* in tsk->exit_state */ |
ad86622b ON |
80 | #define EXIT_DEAD 16 |
81 | #define EXIT_ZOMBIE 32 | |
abd50b39 | 82 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) |
4a8342d2 | 83 | /* in tsk->state again */ |
af927232 | 84 | #define TASK_DEAD 64 |
f021a3c2 | 85 | #define TASK_WAKEKILL 128 |
e9c84311 | 86 | #define TASK_WAKING 256 |
f2530dc7 | 87 | #define TASK_PARKED 512 |
80ed87c8 | 88 | #define TASK_NOLOAD 1024 |
7dc603c9 PZ |
89 | #define TASK_NEW 2048 |
90 | #define TASK_STATE_MAX 4096 | |
f021a3c2 | 91 | |
7dc603c9 | 92 | #define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPNn" |
73342151 | 93 | |
642fa448 | 94 | /* Convenience macros for the sake of set_current_state */ |
f021a3c2 MW |
95 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) |
96 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
97 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 98 | |
80ed87c8 PZ |
99 | #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD) |
100 | ||
92a1f4bc MW |
101 | /* Convenience macros for the sake of wake_up */ |
102 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 103 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
104 | |
105 | /* get_task_state() */ | |
106 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 | 107 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
74e37200 | 108 | __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD) |
92a1f4bc | 109 | |
f021a3c2 MW |
110 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
111 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
92a1f4bc | 112 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 113 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 114 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 115 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
80ed87c8 PZ |
116 | (task->flags & PF_FROZEN) == 0 && \ |
117 | (task->state & TASK_NOLOAD) == 0) | |
1da177e4 | 118 | |
8eb23b9f PZ |
119 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
120 | ||
8eb23b9f PZ |
121 | #define __set_current_state(state_value) \ |
122 | do { \ | |
123 | current->task_state_change = _THIS_IP_; \ | |
124 | current->state = (state_value); \ | |
125 | } while (0) | |
126 | #define set_current_state(state_value) \ | |
127 | do { \ | |
128 | current->task_state_change = _THIS_IP_; \ | |
a2250238 | 129 | smp_store_mb(current->state, (state_value)); \ |
8eb23b9f PZ |
130 | } while (0) |
131 | ||
132 | #else | |
498d0c57 AM |
133 | /* |
134 | * set_current_state() includes a barrier so that the write of current->state | |
135 | * is correctly serialised wrt the caller's subsequent test of whether to | |
136 | * actually sleep: | |
137 | * | |
a2250238 | 138 | * for (;;) { |
498d0c57 | 139 | * set_current_state(TASK_UNINTERRUPTIBLE); |
a2250238 PZ |
140 | * if (!need_sleep) |
141 | * break; | |
142 | * | |
143 | * schedule(); | |
144 | * } | |
145 | * __set_current_state(TASK_RUNNING); | |
146 | * | |
147 | * If the caller does not need such serialisation (because, for instance, the | |
148 | * condition test and condition change and wakeup are under the same lock) then | |
149 | * use __set_current_state(). | |
150 | * | |
151 | * The above is typically ordered against the wakeup, which does: | |
152 | * | |
153 | * need_sleep = false; | |
154 | * wake_up_state(p, TASK_UNINTERRUPTIBLE); | |
155 | * | |
156 | * Where wake_up_state() (and all other wakeup primitives) imply enough | |
157 | * barriers to order the store of the variable against wakeup. | |
158 | * | |
159 | * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is, | |
160 | * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a | |
161 | * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING). | |
498d0c57 | 162 | * |
a2250238 | 163 | * This is obviously fine, since they both store the exact same value. |
498d0c57 | 164 | * |
a2250238 | 165 | * Also see the comments of try_to_wake_up(). |
498d0c57 | 166 | */ |
8eb23b9f | 167 | #define __set_current_state(state_value) \ |
1da177e4 | 168 | do { current->state = (state_value); } while (0) |
8eb23b9f | 169 | #define set_current_state(state_value) \ |
b92b8b35 | 170 | smp_store_mb(current->state, (state_value)) |
1da177e4 | 171 | |
8eb23b9f PZ |
172 | #endif |
173 | ||
1da177e4 LT |
174 | /* Task command name length */ |
175 | #define TASK_COMM_LEN 16 | |
176 | ||
3fa0818b RR |
177 | extern cpumask_var_t cpu_isolated_map; |
178 | ||
89f19f04 | 179 | extern int runqueue_is_locked(int cpu); |
017730c1 | 180 | |
1da177e4 LT |
181 | extern void scheduler_tick(void); |
182 | ||
1da177e4 | 183 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
b3c97528 | 184 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 185 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 186 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 187 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
69b27baf | 188 | extern signed long schedule_timeout_idle(signed long timeout); |
1da177e4 | 189 | asmlinkage void schedule(void); |
c5491ea7 | 190 | extern void schedule_preempt_disabled(void); |
1da177e4 | 191 | |
10ab5643 TH |
192 | extern int __must_check io_schedule_prepare(void); |
193 | extern void io_schedule_finish(int token); | |
9cff8ade | 194 | extern long io_schedule_timeout(long timeout); |
10ab5643 | 195 | extern void io_schedule(void); |
9cff8ade | 196 | |
d37f761d | 197 | /** |
9d7fb042 | 198 | * struct prev_cputime - snaphsot of system and user cputime |
d37f761d FW |
199 | * @utime: time spent in user mode |
200 | * @stime: time spent in system mode | |
9d7fb042 | 201 | * @lock: protects the above two fields |
d37f761d | 202 | * |
9d7fb042 PZ |
203 | * Stores previous user/system time values such that we can guarantee |
204 | * monotonicity. | |
d37f761d | 205 | */ |
9d7fb042 PZ |
206 | struct prev_cputime { |
207 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
5613fda9 FW |
208 | u64 utime; |
209 | u64 stime; | |
9d7fb042 PZ |
210 | raw_spinlock_t lock; |
211 | #endif | |
d37f761d FW |
212 | }; |
213 | ||
f06febc9 FM |
214 | /** |
215 | * struct task_cputime - collected CPU time counts | |
5613fda9 FW |
216 | * @utime: time spent in user mode, in nanoseconds |
217 | * @stime: time spent in kernel mode, in nanoseconds | |
f06febc9 | 218 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds |
5ce73a4a | 219 | * |
9d7fb042 PZ |
220 | * This structure groups together three kinds of CPU time that are tracked for |
221 | * threads and thread groups. Most things considering CPU time want to group | |
222 | * these counts together and treat all three of them in parallel. | |
f06febc9 FM |
223 | */ |
224 | struct task_cputime { | |
5613fda9 FW |
225 | u64 utime; |
226 | u64 stime; | |
f06febc9 FM |
227 | unsigned long long sum_exec_runtime; |
228 | }; | |
9d7fb042 | 229 | |
f06febc9 | 230 | /* Alternate field names when used to cache expirations. */ |
f06febc9 | 231 | #define virt_exp utime |
9d7fb042 | 232 | #define prof_exp stime |
f06febc9 FM |
233 | #define sched_exp sum_exec_runtime |
234 | ||
4714d1d3 | 235 | #include <linux/rwsem.h> |
1da177e4 | 236 | |
f6db8347 | 237 | #ifdef CONFIG_SCHED_INFO |
1da177e4 LT |
238 | struct sched_info { |
239 | /* cumulative counters */ | |
2d72376b | 240 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 241 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
242 | |
243 | /* timestamps */ | |
172ba844 BS |
244 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
245 | last_queued; /* when we were last queued to run */ | |
1da177e4 | 246 | }; |
f6db8347 | 247 | #endif /* CONFIG_SCHED_INFO */ |
1da177e4 | 248 | |
6ecdd749 YD |
249 | /* |
250 | * Integer metrics need fixed point arithmetic, e.g., sched/fair | |
251 | * has a few: load, load_avg, util_avg, freq, and capacity. | |
252 | * | |
253 | * We define a basic fixed point arithmetic range, and then formalize | |
254 | * all these metrics based on that basic range. | |
255 | */ | |
256 | # define SCHED_FIXEDPOINT_SHIFT 10 | |
257 | # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT) | |
258 | ||
383f2835 | 259 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 260 | extern void prefetch_stack(struct task_struct *t); |
383f2835 KC |
261 | #else |
262 | static inline void prefetch_stack(struct task_struct *t) { } | |
263 | #endif | |
1da177e4 | 264 | |
20b8a59f | 265 | struct load_weight { |
9dbdb155 PZ |
266 | unsigned long weight; |
267 | u32 inv_weight; | |
20b8a59f IM |
268 | }; |
269 | ||
9d89c257 | 270 | /* |
7b595334 YD |
271 | * The load_avg/util_avg accumulates an infinite geometric series |
272 | * (see __update_load_avg() in kernel/sched/fair.c). | |
273 | * | |
274 | * [load_avg definition] | |
275 | * | |
276 | * load_avg = runnable% * scale_load_down(load) | |
277 | * | |
278 | * where runnable% is the time ratio that a sched_entity is runnable. | |
279 | * For cfs_rq, it is the aggregated load_avg of all runnable and | |
9d89c257 | 280 | * blocked sched_entities. |
7b595334 YD |
281 | * |
282 | * load_avg may also take frequency scaling into account: | |
283 | * | |
284 | * load_avg = runnable% * scale_load_down(load) * freq% | |
285 | * | |
286 | * where freq% is the CPU frequency normalized to the highest frequency. | |
287 | * | |
288 | * [util_avg definition] | |
289 | * | |
290 | * util_avg = running% * SCHED_CAPACITY_SCALE | |
291 | * | |
292 | * where running% is the time ratio that a sched_entity is running on | |
293 | * a CPU. For cfs_rq, it is the aggregated util_avg of all runnable | |
294 | * and blocked sched_entities. | |
295 | * | |
296 | * util_avg may also factor frequency scaling and CPU capacity scaling: | |
297 | * | |
298 | * util_avg = running% * SCHED_CAPACITY_SCALE * freq% * capacity% | |
299 | * | |
300 | * where freq% is the same as above, and capacity% is the CPU capacity | |
301 | * normalized to the greatest capacity (due to uarch differences, etc). | |
302 | * | |
303 | * N.B., the above ratios (runnable%, running%, freq%, and capacity%) | |
304 | * themselves are in the range of [0, 1]. To do fixed point arithmetics, | |
305 | * we therefore scale them to as large a range as necessary. This is for | |
306 | * example reflected by util_avg's SCHED_CAPACITY_SCALE. | |
307 | * | |
308 | * [Overflow issue] | |
309 | * | |
310 | * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities | |
311 | * with the highest load (=88761), always runnable on a single cfs_rq, | |
312 | * and should not overflow as the number already hits PID_MAX_LIMIT. | |
313 | * | |
314 | * For all other cases (including 32-bit kernels), struct load_weight's | |
315 | * weight will overflow first before we do, because: | |
316 | * | |
317 | * Max(load_avg) <= Max(load.weight) | |
318 | * | |
319 | * Then it is the load_weight's responsibility to consider overflow | |
320 | * issues. | |
9d89c257 | 321 | */ |
9d85f21c | 322 | struct sched_avg { |
9d89c257 YD |
323 | u64 last_update_time, load_sum; |
324 | u32 util_sum, period_contrib; | |
325 | unsigned long load_avg, util_avg; | |
9d85f21c PT |
326 | }; |
327 | ||
94c18227 | 328 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 329 | struct sched_statistics { |
20b8a59f | 330 | u64 wait_start; |
94c18227 | 331 | u64 wait_max; |
6d082592 AV |
332 | u64 wait_count; |
333 | u64 wait_sum; | |
8f0dfc34 AV |
334 | u64 iowait_count; |
335 | u64 iowait_sum; | |
94c18227 | 336 | |
20b8a59f | 337 | u64 sleep_start; |
20b8a59f | 338 | u64 sleep_max; |
94c18227 IM |
339 | s64 sum_sleep_runtime; |
340 | ||
341 | u64 block_start; | |
20b8a59f IM |
342 | u64 block_max; |
343 | u64 exec_max; | |
eba1ed4b | 344 | u64 slice_max; |
cc367732 | 345 | |
cc367732 IM |
346 | u64 nr_migrations_cold; |
347 | u64 nr_failed_migrations_affine; | |
348 | u64 nr_failed_migrations_running; | |
349 | u64 nr_failed_migrations_hot; | |
350 | u64 nr_forced_migrations; | |
cc367732 IM |
351 | |
352 | u64 nr_wakeups; | |
353 | u64 nr_wakeups_sync; | |
354 | u64 nr_wakeups_migrate; | |
355 | u64 nr_wakeups_local; | |
356 | u64 nr_wakeups_remote; | |
357 | u64 nr_wakeups_affine; | |
358 | u64 nr_wakeups_affine_attempts; | |
359 | u64 nr_wakeups_passive; | |
360 | u64 nr_wakeups_idle; | |
41acab88 LDM |
361 | }; |
362 | #endif | |
363 | ||
364 | struct sched_entity { | |
365 | struct load_weight load; /* for load-balancing */ | |
366 | struct rb_node run_node; | |
367 | struct list_head group_node; | |
368 | unsigned int on_rq; | |
369 | ||
370 | u64 exec_start; | |
371 | u64 sum_exec_runtime; | |
372 | u64 vruntime; | |
373 | u64 prev_sum_exec_runtime; | |
374 | ||
41acab88 LDM |
375 | u64 nr_migrations; |
376 | ||
41acab88 LDM |
377 | #ifdef CONFIG_SCHEDSTATS |
378 | struct sched_statistics statistics; | |
94c18227 IM |
379 | #endif |
380 | ||
20b8a59f | 381 | #ifdef CONFIG_FAIR_GROUP_SCHED |
fed14d45 | 382 | int depth; |
20b8a59f IM |
383 | struct sched_entity *parent; |
384 | /* rq on which this entity is (to be) queued: */ | |
385 | struct cfs_rq *cfs_rq; | |
386 | /* rq "owned" by this entity/group: */ | |
387 | struct cfs_rq *my_q; | |
388 | #endif | |
8bd75c77 | 389 | |
141965c7 | 390 | #ifdef CONFIG_SMP |
5a107804 JO |
391 | /* |
392 | * Per entity load average tracking. | |
393 | * | |
394 | * Put into separate cache line so it does not | |
395 | * collide with read-mostly values above. | |
396 | */ | |
397 | struct sched_avg avg ____cacheline_aligned_in_smp; | |
9d85f21c | 398 | #endif |
20b8a59f | 399 | }; |
70b97a7f | 400 | |
fa717060 PZ |
401 | struct sched_rt_entity { |
402 | struct list_head run_list; | |
78f2c7db | 403 | unsigned long timeout; |
57d2aa00 | 404 | unsigned long watchdog_stamp; |
bee367ed | 405 | unsigned int time_slice; |
ff77e468 PZ |
406 | unsigned short on_rq; |
407 | unsigned short on_list; | |
6f505b16 | 408 | |
58d6c2d7 | 409 | struct sched_rt_entity *back; |
052f1dc7 | 410 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
411 | struct sched_rt_entity *parent; |
412 | /* rq on which this entity is (to be) queued: */ | |
413 | struct rt_rq *rt_rq; | |
414 | /* rq "owned" by this entity/group: */ | |
415 | struct rt_rq *my_q; | |
416 | #endif | |
fa717060 PZ |
417 | }; |
418 | ||
aab03e05 DF |
419 | struct sched_dl_entity { |
420 | struct rb_node rb_node; | |
421 | ||
422 | /* | |
423 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 424 | * during sched_setattr(), they will remain the same until |
425 | * the next sched_setattr(). | |
aab03e05 DF |
426 | */ |
427 | u64 dl_runtime; /* maximum runtime for each instance */ | |
428 | u64 dl_deadline; /* relative deadline of each instance */ | |
755378a4 | 429 | u64 dl_period; /* separation of two instances (period) */ |
332ac17e | 430 | u64 dl_bw; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
431 | |
432 | /* | |
433 | * Actual scheduling parameters. Initialized with the values above, | |
434 | * they are continously updated during task execution. Note that | |
435 | * the remaining runtime could be < 0 in case we are in overrun. | |
436 | */ | |
437 | s64 runtime; /* remaining runtime for this instance */ | |
438 | u64 deadline; /* absolute deadline for this instance */ | |
439 | unsigned int flags; /* specifying the scheduler behaviour */ | |
440 | ||
441 | /* | |
442 | * Some bool flags: | |
443 | * | |
444 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
445 | * task has to wait for a replenishment to be performed at the | |
446 | * next firing of dl_timer. | |
447 | * | |
2d3d891d DF |
448 | * @dl_boosted tells if we are boosted due to DI. If so we are |
449 | * outside bandwidth enforcement mechanism (but only until we | |
5bfd126e JL |
450 | * exit the critical section); |
451 | * | |
452 | * @dl_yielded tells if task gave up the cpu before consuming | |
453 | * all its available runtime during the last job. | |
aab03e05 | 454 | */ |
72f9f3fd | 455 | int dl_throttled, dl_boosted, dl_yielded; |
aab03e05 DF |
456 | |
457 | /* | |
458 | * Bandwidth enforcement timer. Each -deadline task has its | |
459 | * own bandwidth to be enforced, thus we need one timer per task. | |
460 | */ | |
461 | struct hrtimer dl_timer; | |
462 | }; | |
8bd75c77 | 463 | |
1d082fd0 PM |
464 | union rcu_special { |
465 | struct { | |
8203d6d0 PM |
466 | u8 blocked; |
467 | u8 need_qs; | |
468 | u8 exp_need_qs; | |
469 | u8 pad; /* Otherwise the compiler can store garbage here. */ | |
470 | } b; /* Bits. */ | |
471 | u32 s; /* Set of bits. */ | |
1d082fd0 | 472 | }; |
86848966 | 473 | |
8dc85d54 PZ |
474 | enum perf_event_task_context { |
475 | perf_invalid_context = -1, | |
476 | perf_hw_context = 0, | |
89a1e187 | 477 | perf_sw_context, |
8dc85d54 PZ |
478 | perf_nr_task_contexts, |
479 | }; | |
480 | ||
eb61baf6 IM |
481 | struct wake_q_node { |
482 | struct wake_q_node *next; | |
483 | }; | |
484 | ||
1da177e4 | 485 | struct task_struct { |
c65eacbe AL |
486 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
487 | /* | |
488 | * For reasons of header soup (see current_thread_info()), this | |
489 | * must be the first element of task_struct. | |
490 | */ | |
491 | struct thread_info thread_info; | |
492 | #endif | |
1da177e4 | 493 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ |
f7e4217b | 494 | void *stack; |
1da177e4 | 495 | atomic_t usage; |
97dc32cd WC |
496 | unsigned int flags; /* per process flags, defined below */ |
497 | unsigned int ptrace; | |
1da177e4 | 498 | |
2dd73a4f | 499 | #ifdef CONFIG_SMP |
fa14ff4a | 500 | struct llist_node wake_entry; |
3ca7a440 | 501 | int on_cpu; |
c65eacbe AL |
502 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
503 | unsigned int cpu; /* current CPU */ | |
504 | #endif | |
63b0e9ed | 505 | unsigned int wakee_flips; |
62470419 | 506 | unsigned long wakee_flip_decay_ts; |
63b0e9ed | 507 | struct task_struct *last_wakee; |
ac66f547 PZ |
508 | |
509 | int wake_cpu; | |
2dd73a4f | 510 | #endif |
fd2f4419 | 511 | int on_rq; |
50e645a8 | 512 | |
b29739f9 | 513 | int prio, static_prio, normal_prio; |
c7aceaba | 514 | unsigned int rt_priority; |
5522d5d5 | 515 | const struct sched_class *sched_class; |
20b8a59f | 516 | struct sched_entity se; |
fa717060 | 517 | struct sched_rt_entity rt; |
8323f26c PZ |
518 | #ifdef CONFIG_CGROUP_SCHED |
519 | struct task_group *sched_task_group; | |
520 | #endif | |
aab03e05 | 521 | struct sched_dl_entity dl; |
1da177e4 | 522 | |
e107be36 AK |
523 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
524 | /* list of struct preempt_notifier: */ | |
525 | struct hlist_head preempt_notifiers; | |
526 | #endif | |
527 | ||
6c5c9341 | 528 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 529 | unsigned int btrace_seq; |
6c5c9341 | 530 | #endif |
1da177e4 | 531 | |
97dc32cd | 532 | unsigned int policy; |
29baa747 | 533 | int nr_cpus_allowed; |
1da177e4 | 534 | cpumask_t cpus_allowed; |
1da177e4 | 535 | |
a57eb940 | 536 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 537 | int rcu_read_lock_nesting; |
1d082fd0 | 538 | union rcu_special rcu_read_unlock_special; |
f41d911f | 539 | struct list_head rcu_node_entry; |
a57eb940 | 540 | struct rcu_node *rcu_blocked_node; |
28f6569a | 541 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
8315f422 PM |
542 | #ifdef CONFIG_TASKS_RCU |
543 | unsigned long rcu_tasks_nvcsw; | |
544 | bool rcu_tasks_holdout; | |
545 | struct list_head rcu_tasks_holdout_list; | |
176f8f7a | 546 | int rcu_tasks_idle_cpu; |
8315f422 | 547 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
e260be67 | 548 | |
f6db8347 | 549 | #ifdef CONFIG_SCHED_INFO |
1da177e4 LT |
550 | struct sched_info sched_info; |
551 | #endif | |
552 | ||
553 | struct list_head tasks; | |
806c09a7 | 554 | #ifdef CONFIG_SMP |
917b627d | 555 | struct plist_node pushable_tasks; |
1baca4ce | 556 | struct rb_node pushable_dl_tasks; |
806c09a7 | 557 | #endif |
1da177e4 LT |
558 | |
559 | struct mm_struct *mm, *active_mm; | |
314ff785 IM |
560 | |
561 | /* Per-thread vma caching: */ | |
562 | struct vmacache vmacache; | |
563 | ||
34e55232 KH |
564 | #if defined(SPLIT_RSS_COUNTING) |
565 | struct task_rss_stat rss_stat; | |
566 | #endif | |
1da177e4 | 567 | /* task state */ |
97dc32cd | 568 | int exit_state; |
1da177e4 LT |
569 | int exit_code, exit_signal; |
570 | int pdeath_signal; /* The signal sent when the parent dies */ | |
e7cc4173 | 571 | unsigned long jobctl; /* JOBCTL_*, siglock protected */ |
9b89f6ba AE |
572 | |
573 | /* Used for emulating ABI behavior of previous Linux versions */ | |
97dc32cd | 574 | unsigned int personality; |
9b89f6ba | 575 | |
be958bdc | 576 | /* scheduler bits, serialized by scheduler locks */ |
ca94c442 | 577 | unsigned sched_reset_on_fork:1; |
a8e4f2ea | 578 | unsigned sched_contributes_to_load:1; |
ff303e66 | 579 | unsigned sched_migrated:1; |
b7e7ade3 | 580 | unsigned sched_remote_wakeup:1; |
be958bdc PZ |
581 | unsigned :0; /* force alignment to the next boundary */ |
582 | ||
583 | /* unserialized, strictly 'current' */ | |
584 | unsigned in_execve:1; /* bit to tell LSMs we're in execve */ | |
585 | unsigned in_iowait:1; | |
7e781418 AL |
586 | #if !defined(TIF_RESTORE_SIGMASK) |
587 | unsigned restore_sigmask:1; | |
588 | #endif | |
626ebc41 TH |
589 | #ifdef CONFIG_MEMCG |
590 | unsigned memcg_may_oom:1; | |
127424c8 | 591 | #ifndef CONFIG_SLOB |
6f185c29 VD |
592 | unsigned memcg_kmem_skip_account:1; |
593 | #endif | |
127424c8 | 594 | #endif |
ff303e66 PZ |
595 | #ifdef CONFIG_COMPAT_BRK |
596 | unsigned brk_randomized:1; | |
597 | #endif | |
6f185c29 | 598 | |
1d4457f9 KC |
599 | unsigned long atomic_flags; /* Flags needing atomic access. */ |
600 | ||
f56141e3 AL |
601 | struct restart_block restart_block; |
602 | ||
1da177e4 LT |
603 | pid_t pid; |
604 | pid_t tgid; | |
0a425405 | 605 | |
1314562a | 606 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
607 | /* Canary value for the -fstack-protector gcc feature */ |
608 | unsigned long stack_canary; | |
1314562a | 609 | #endif |
4d1d61a6 | 610 | /* |
1da177e4 | 611 | * pointers to (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 612 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 613 | * p->real_parent->pid) |
1da177e4 | 614 | */ |
abd63bc3 KC |
615 | struct task_struct __rcu *real_parent; /* real parent process */ |
616 | struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 617 | /* |
f470021a | 618 | * children/sibling forms the list of my natural children |
1da177e4 LT |
619 | */ |
620 | struct list_head children; /* list of my children */ | |
621 | struct list_head sibling; /* linkage in my parent's children list */ | |
622 | struct task_struct *group_leader; /* threadgroup leader */ | |
623 | ||
f470021a RM |
624 | /* |
625 | * ptraced is the list of tasks this task is using ptrace on. | |
626 | * This includes both natural children and PTRACE_ATTACH targets. | |
627 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
628 | */ | |
629 | struct list_head ptraced; | |
630 | struct list_head ptrace_entry; | |
631 | ||
1da177e4 | 632 | /* PID/PID hash table linkage. */ |
92476d7f | 633 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 634 | struct list_head thread_group; |
0c740d0a | 635 | struct list_head thread_node; |
1da177e4 LT |
636 | |
637 | struct completion *vfork_done; /* for vfork() */ | |
638 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
639 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
640 | ||
5613fda9 | 641 | u64 utime, stime; |
40565b5a | 642 | #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME |
5613fda9 | 643 | u64 utimescaled, stimescaled; |
40565b5a | 644 | #endif |
16a6d9be | 645 | u64 gtime; |
9d7fb042 | 646 | struct prev_cputime prev_cputime; |
6a61671b | 647 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
b7ce2277 | 648 | seqcount_t vtime_seqcount; |
6a61671b FW |
649 | unsigned long long vtime_snap; |
650 | enum { | |
7098c1ea FW |
651 | /* Task is sleeping or running in a CPU with VTIME inactive */ |
652 | VTIME_INACTIVE = 0, | |
653 | /* Task runs in userspace in a CPU with VTIME active */ | |
6a61671b | 654 | VTIME_USER, |
7098c1ea | 655 | /* Task runs in kernelspace in a CPU with VTIME active */ |
6a61671b FW |
656 | VTIME_SYS, |
657 | } vtime_snap_whence; | |
d99ca3b9 | 658 | #endif |
d027d45d FW |
659 | |
660 | #ifdef CONFIG_NO_HZ_FULL | |
f009a7a7 | 661 | atomic_t tick_dep_mask; |
d027d45d | 662 | #endif |
1da177e4 | 663 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
ccbf62d8 | 664 | u64 start_time; /* monotonic time in nsec */ |
57e0be04 | 665 | u64 real_start_time; /* boot based time in nsec */ |
1da177e4 LT |
666 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
667 | unsigned long min_flt, maj_flt; | |
668 | ||
b18b6a9c | 669 | #ifdef CONFIG_POSIX_TIMERS |
f06febc9 | 670 | struct task_cputime cputime_expires; |
1da177e4 | 671 | struct list_head cpu_timers[3]; |
b18b6a9c | 672 | #endif |
1da177e4 LT |
673 | |
674 | /* process credentials */ | |
64b875f7 | 675 | const struct cred __rcu *ptracer_cred; /* Tracer's credentials at attach */ |
1b0ba1c9 | 676 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 677 | * credentials (COW) */ |
1b0ba1c9 | 678 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 679 | * credentials (COW) */ |
36772092 PBG |
680 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
681 | - access with [gs]et_task_comm (which lock | |
682 | it with task_lock()) | |
221af7f8 | 683 | - initialized normally by setup_new_exec */ |
1da177e4 | 684 | /* file system info */ |
756daf26 | 685 | struct nameidata *nameidata; |
3d5b6fcc | 686 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
687 | /* ipc stuff */ |
688 | struct sysv_sem sysvsem; | |
ab602f79 | 689 | struct sysv_shm sysvshm; |
3d5b6fcc | 690 | #endif |
e162b39a | 691 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 692 | /* hung task detection */ |
82a1fcb9 IM |
693 | unsigned long last_switch_count; |
694 | #endif | |
1da177e4 LT |
695 | /* filesystem information */ |
696 | struct fs_struct *fs; | |
697 | /* open file information */ | |
698 | struct files_struct *files; | |
1651e14e | 699 | /* namespaces */ |
ab516013 | 700 | struct nsproxy *nsproxy; |
1da177e4 LT |
701 | /* signal handlers */ |
702 | struct signal_struct *signal; | |
703 | struct sighand_struct *sighand; | |
704 | ||
705 | sigset_t blocked, real_blocked; | |
f3de272b | 706 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
707 | struct sigpending pending; |
708 | ||
709 | unsigned long sas_ss_sp; | |
710 | size_t sas_ss_size; | |
2a742138 | 711 | unsigned sas_ss_flags; |
2e01fabe | 712 | |
67d12145 | 713 | struct callback_head *task_works; |
e73f8959 | 714 | |
1da177e4 | 715 | struct audit_context *audit_context; |
bfef93a5 | 716 | #ifdef CONFIG_AUDITSYSCALL |
e1760bd5 | 717 | kuid_t loginuid; |
4746ec5b | 718 | unsigned int sessionid; |
bfef93a5 | 719 | #endif |
932ecebb | 720 | struct seccomp seccomp; |
1da177e4 LT |
721 | |
722 | /* Thread group tracking */ | |
723 | u32 parent_exec_id; | |
724 | u32 self_exec_id; | |
58568d2a MX |
725 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
726 | * mempolicy */ | |
1da177e4 | 727 | spinlock_t alloc_lock; |
1da177e4 | 728 | |
b29739f9 | 729 | /* Protection of the PI data structures: */ |
1d615482 | 730 | raw_spinlock_t pi_lock; |
b29739f9 | 731 | |
76751049 PZ |
732 | struct wake_q_node wake_q; |
733 | ||
23f78d4a IM |
734 | #ifdef CONFIG_RT_MUTEXES |
735 | /* PI waiters blocked on a rt_mutex held by this task */ | |
fb00aca4 PZ |
736 | struct rb_root pi_waiters; |
737 | struct rb_node *pi_waiters_leftmost; | |
23f78d4a IM |
738 | /* Deadlock detection and priority inheritance handling */ |
739 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
740 | #endif |
741 | ||
408894ee IM |
742 | #ifdef CONFIG_DEBUG_MUTEXES |
743 | /* mutex deadlock detection */ | |
744 | struct mutex_waiter *blocked_on; | |
745 | #endif | |
de30a2b3 IM |
746 | #ifdef CONFIG_TRACE_IRQFLAGS |
747 | unsigned int irq_events; | |
de30a2b3 | 748 | unsigned long hardirq_enable_ip; |
de30a2b3 | 749 | unsigned long hardirq_disable_ip; |
fa1452e8 | 750 | unsigned int hardirq_enable_event; |
de30a2b3 | 751 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
752 | int hardirqs_enabled; |
753 | int hardirq_context; | |
de30a2b3 | 754 | unsigned long softirq_disable_ip; |
de30a2b3 | 755 | unsigned long softirq_enable_ip; |
fa1452e8 | 756 | unsigned int softirq_disable_event; |
de30a2b3 | 757 | unsigned int softirq_enable_event; |
fa1452e8 | 758 | int softirqs_enabled; |
de30a2b3 IM |
759 | int softirq_context; |
760 | #endif | |
fbb9ce95 | 761 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 762 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
763 | u64 curr_chain_key; |
764 | int lockdep_depth; | |
fbb9ce95 | 765 | unsigned int lockdep_recursion; |
c7aceaba | 766 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 767 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 768 | #endif |
c6d30853 AR |
769 | #ifdef CONFIG_UBSAN |
770 | unsigned int in_ubsan; | |
771 | #endif | |
408894ee | 772 | |
1da177e4 LT |
773 | /* journalling filesystem info */ |
774 | void *journal_info; | |
775 | ||
d89d8796 | 776 | /* stacked block device info */ |
bddd87c7 | 777 | struct bio_list *bio_list; |
d89d8796 | 778 | |
73c10101 JA |
779 | #ifdef CONFIG_BLOCK |
780 | /* stack plugging */ | |
781 | struct blk_plug *plug; | |
782 | #endif | |
783 | ||
1da177e4 LT |
784 | /* VM state */ |
785 | struct reclaim_state *reclaim_state; | |
786 | ||
1da177e4 LT |
787 | struct backing_dev_info *backing_dev_info; |
788 | ||
789 | struct io_context *io_context; | |
790 | ||
791 | unsigned long ptrace_message; | |
792 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 793 | struct task_io_accounting ioac; |
8f0ab514 | 794 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
795 | u64 acct_rss_mem1; /* accumulated rss usage */ |
796 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
605dc2b3 | 797 | u64 acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
798 | #endif |
799 | #ifdef CONFIG_CPUSETS | |
58568d2a | 800 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
cc9a6c87 | 801 | seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ |
825a46af | 802 | int cpuset_mem_spread_rotor; |
6adef3eb | 803 | int cpuset_slab_spread_rotor; |
1da177e4 | 804 | #endif |
ddbcc7e8 | 805 | #ifdef CONFIG_CGROUPS |
817929ec | 806 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 807 | struct css_set __rcu *cgroups; |
817929ec PM |
808 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
809 | struct list_head cg_list; | |
ddbcc7e8 | 810 | #endif |
e02737d5 FY |
811 | #ifdef CONFIG_INTEL_RDT_A |
812 | int closid; | |
813 | #endif | |
42b2dd0a | 814 | #ifdef CONFIG_FUTEX |
0771dfef | 815 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
816 | #ifdef CONFIG_COMPAT |
817 | struct compat_robust_list_head __user *compat_robust_list; | |
818 | #endif | |
c87e2837 IM |
819 | struct list_head pi_state_list; |
820 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 821 | #endif |
cdd6c482 | 822 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 823 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
824 | struct mutex perf_event_mutex; |
825 | struct list_head perf_event_list; | |
a63eaf34 | 826 | #endif |
8f47b187 TG |
827 | #ifdef CONFIG_DEBUG_PREEMPT |
828 | unsigned long preempt_disable_ip; | |
829 | #endif | |
c7aceaba | 830 | #ifdef CONFIG_NUMA |
58568d2a | 831 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 832 | short il_next; |
207205a2 | 833 | short pref_node_fork; |
42b2dd0a | 834 | #endif |
cbee9f88 PZ |
835 | #ifdef CONFIG_NUMA_BALANCING |
836 | int numa_scan_seq; | |
cbee9f88 | 837 | unsigned int numa_scan_period; |
598f0ec0 | 838 | unsigned int numa_scan_period_max; |
de1c9ce6 | 839 | int numa_preferred_nid; |
6b9a7460 | 840 | unsigned long numa_migrate_retry; |
cbee9f88 | 841 | u64 node_stamp; /* migration stamp */ |
7e2703e6 RR |
842 | u64 last_task_numa_placement; |
843 | u64 last_sum_exec_runtime; | |
cbee9f88 | 844 | struct callback_head numa_work; |
f809ca9a | 845 | |
8c8a743c PZ |
846 | struct list_head numa_entry; |
847 | struct numa_group *numa_group; | |
848 | ||
745d6147 | 849 | /* |
44dba3d5 IM |
850 | * numa_faults is an array split into four regions: |
851 | * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer | |
852 | * in this precise order. | |
853 | * | |
854 | * faults_memory: Exponential decaying average of faults on a per-node | |
855 | * basis. Scheduling placement decisions are made based on these | |
856 | * counts. The values remain static for the duration of a PTE scan. | |
857 | * faults_cpu: Track the nodes the process was running on when a NUMA | |
858 | * hinting fault was incurred. | |
859 | * faults_memory_buffer and faults_cpu_buffer: Record faults per node | |
860 | * during the current scan window. When the scan completes, the counts | |
861 | * in faults_memory and faults_cpu decay and these values are copied. | |
745d6147 | 862 | */ |
44dba3d5 | 863 | unsigned long *numa_faults; |
83e1d2cd | 864 | unsigned long total_numa_faults; |
745d6147 | 865 | |
04bb2f94 RR |
866 | /* |
867 | * numa_faults_locality tracks if faults recorded during the last | |
074c2381 MG |
868 | * scan window were remote/local or failed to migrate. The task scan |
869 | * period is adapted based on the locality of the faults with different | |
870 | * weights depending on whether they were shared or private faults | |
04bb2f94 | 871 | */ |
074c2381 | 872 | unsigned long numa_faults_locality[3]; |
04bb2f94 | 873 | |
b32e86b4 | 874 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
875 | #endif /* CONFIG_NUMA_BALANCING */ |
876 | ||
72b252ae | 877 | struct tlbflush_unmap_batch tlb_ubc; |
72b252ae | 878 | |
e56d0903 | 879 | struct rcu_head rcu; |
b92ce558 JA |
880 | |
881 | /* | |
882 | * cache last used pipe for splice | |
883 | */ | |
884 | struct pipe_inode_info *splice_pipe; | |
5640f768 ED |
885 | |
886 | struct page_frag task_frag; | |
887 | ||
47913d4e IM |
888 | #ifdef CONFIG_TASK_DELAY_ACCT |
889 | struct task_delay_info *delays; | |
f4f154fd | 890 | #endif |
47913d4e | 891 | |
f4f154fd AM |
892 | #ifdef CONFIG_FAULT_INJECTION |
893 | int make_it_fail; | |
ca74e92b | 894 | #endif |
9d823e8f WF |
895 | /* |
896 | * when (nr_dirtied >= nr_dirtied_pause), it's time to call | |
897 | * balance_dirty_pages() for some dirty throttling pause | |
898 | */ | |
899 | int nr_dirtied; | |
900 | int nr_dirtied_pause; | |
83712358 | 901 | unsigned long dirty_paused_when; /* start of a write-and-pause period */ |
9d823e8f | 902 | |
9745512c AV |
903 | #ifdef CONFIG_LATENCYTOP |
904 | int latency_record_count; | |
905 | struct latency_record latency_record[LT_SAVECOUNT]; | |
906 | #endif | |
6976675d AV |
907 | /* |
908 | * time slack values; these are used to round up poll() and | |
909 | * select() etc timeout values. These are in nanoseconds. | |
910 | */ | |
da8b44d5 JS |
911 | u64 timer_slack_ns; |
912 | u64 default_timer_slack_ns; | |
f8d570a4 | 913 | |
0b24becc AR |
914 | #ifdef CONFIG_KASAN |
915 | unsigned int kasan_depth; | |
916 | #endif | |
fb52607a | 917 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 918 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
919 | int curr_ret_stack; |
920 | /* Stack of return addresses for return function tracing */ | |
921 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
922 | /* time stamp for last schedule */ |
923 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
924 | /* |
925 | * Number of functions that haven't been traced | |
926 | * because of depth overrun. | |
927 | */ | |
928 | atomic_t trace_overrun; | |
380c4b14 FW |
929 | /* Pause for the tracing */ |
930 | atomic_t tracing_graph_pause; | |
f201ae23 | 931 | #endif |
ea4e2bc4 SR |
932 | #ifdef CONFIG_TRACING |
933 | /* state flags for use by tracers */ | |
934 | unsigned long trace; | |
b1cff0ad | 935 | /* bitmask and counter of trace recursion */ |
261842b7 SR |
936 | unsigned long trace_recursion; |
937 | #endif /* CONFIG_TRACING */ | |
5c9a8750 DV |
938 | #ifdef CONFIG_KCOV |
939 | /* Coverage collection mode enabled for this task (0 if disabled). */ | |
940 | enum kcov_mode kcov_mode; | |
941 | /* Size of the kcov_area. */ | |
942 | unsigned kcov_size; | |
943 | /* Buffer for coverage collection. */ | |
944 | void *kcov_area; | |
945 | /* kcov desciptor wired with this task or NULL. */ | |
946 | struct kcov *kcov; | |
947 | #endif | |
6f185c29 | 948 | #ifdef CONFIG_MEMCG |
626ebc41 TH |
949 | struct mem_cgroup *memcg_in_oom; |
950 | gfp_t memcg_oom_gfp_mask; | |
951 | int memcg_oom_order; | |
b23afb93 TH |
952 | |
953 | /* number of pages to reclaim on returning to userland */ | |
954 | unsigned int memcg_nr_pages_over_high; | |
569b846d | 955 | #endif |
0326f5a9 SD |
956 | #ifdef CONFIG_UPROBES |
957 | struct uprobe_task *utask; | |
0326f5a9 | 958 | #endif |
cafe5635 KO |
959 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
960 | unsigned int sequential_io; | |
961 | unsigned int sequential_io_avg; | |
962 | #endif | |
8eb23b9f PZ |
963 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
964 | unsigned long task_state_change; | |
965 | #endif | |
8bcbde54 | 966 | int pagefault_disabled; |
03049269 | 967 | #ifdef CONFIG_MMU |
29c696e1 | 968 | struct task_struct *oom_reaper_list; |
03049269 | 969 | #endif |
ba14a194 AL |
970 | #ifdef CONFIG_VMAP_STACK |
971 | struct vm_struct *stack_vm_area; | |
972 | #endif | |
68f24b08 AL |
973 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
974 | /* A live task holds one reference. */ | |
975 | atomic_t stack_refcount; | |
976 | #endif | |
0c8c0f03 DH |
977 | /* CPU-specific state of this task */ |
978 | struct thread_struct thread; | |
979 | /* | |
980 | * WARNING: on x86, 'thread_struct' contains a variable-sized | |
981 | * structure. It *MUST* be at the end of 'task_struct'. | |
982 | * | |
983 | * Do not put anything below here! | |
984 | */ | |
1da177e4 LT |
985 | }; |
986 | ||
e868171a | 987 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
988 | { |
989 | return task->pids[PIDTYPE_PID].pid; | |
990 | } | |
991 | ||
e868171a | 992 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
993 | { |
994 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
995 | } | |
996 | ||
6dda81f4 ON |
997 | /* |
998 | * Without tasklist or rcu lock it is not safe to dereference | |
999 | * the result of task_pgrp/task_session even if task == current, | |
1000 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1001 | */ | |
e868171a | 1002 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1003 | { |
1004 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1005 | } | |
1006 | ||
e868171a | 1007 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1008 | { |
1009 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1010 | } | |
1011 | ||
7af57294 PE |
1012 | /* |
1013 | * the helpers to get the task's different pids as they are seen | |
1014 | * from various namespaces | |
1015 | * | |
1016 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1017 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1018 | * current. | |
7af57294 PE |
1019 | * task_xid_nr_ns() : id seen from the ns specified; |
1020 | * | |
1021 | * set_task_vxid() : assigns a virtual id to a task; | |
1022 | * | |
7af57294 PE |
1023 | * see also pid_nr() etc in include/linux/pid.h |
1024 | */ | |
52ee2dfd ON |
1025 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1026 | struct pid_namespace *ns); | |
7af57294 | 1027 | |
e868171a | 1028 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1029 | { |
1030 | return tsk->pid; | |
1031 | } | |
1032 | ||
52ee2dfd ON |
1033 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1034 | struct pid_namespace *ns) | |
1035 | { | |
1036 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1037 | } | |
7af57294 PE |
1038 | |
1039 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1040 | { | |
52ee2dfd | 1041 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1042 | } |
1043 | ||
1044 | ||
e868171a | 1045 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1046 | { |
1047 | return tsk->tgid; | |
1048 | } | |
1049 | ||
2f2a3a46 | 1050 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1051 | |
1052 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1053 | { | |
1054 | return pid_vnr(task_tgid(tsk)); | |
1055 | } | |
1056 | ||
1057 | ||
80e0b6e8 | 1058 | static inline int pid_alive(const struct task_struct *p); |
ad36d282 RGB |
1059 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) |
1060 | { | |
1061 | pid_t pid = 0; | |
1062 | ||
1063 | rcu_read_lock(); | |
1064 | if (pid_alive(tsk)) | |
1065 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1066 | rcu_read_unlock(); | |
1067 | ||
1068 | return pid; | |
1069 | } | |
1070 | ||
1071 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1072 | { | |
1073 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1074 | } | |
1075 | ||
52ee2dfd ON |
1076 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1077 | struct pid_namespace *ns) | |
7af57294 | 1078 | { |
52ee2dfd | 1079 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1080 | } |
1081 | ||
7af57294 PE |
1082 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1083 | { | |
52ee2dfd | 1084 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1085 | } |
1086 | ||
1087 | ||
52ee2dfd ON |
1088 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1089 | struct pid_namespace *ns) | |
7af57294 | 1090 | { |
52ee2dfd | 1091 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1092 | } |
1093 | ||
7af57294 PE |
1094 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1095 | { | |
52ee2dfd | 1096 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1097 | } |
1098 | ||
1b0f7ffd ON |
1099 | /* obsolete, do not use */ |
1100 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1101 | { | |
1102 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1103 | } | |
7af57294 | 1104 | |
1da177e4 LT |
1105 | /** |
1106 | * pid_alive - check that a task structure is not stale | |
1107 | * @p: Task structure to be checked. | |
1108 | * | |
1109 | * Test if a process is not yet dead (at most zombie state) | |
1110 | * If pid_alive fails, then pointers within the task structure | |
1111 | * can be stale and must not be dereferenced. | |
e69f6186 YB |
1112 | * |
1113 | * Return: 1 if the process is alive. 0 otherwise. | |
1da177e4 | 1114 | */ |
ad36d282 | 1115 | static inline int pid_alive(const struct task_struct *p) |
1da177e4 | 1116 | { |
92476d7f | 1117 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1118 | } |
1119 | ||
f400e198 | 1120 | /** |
570f5241 SS |
1121 | * is_global_init - check if a task structure is init. Since init |
1122 | * is free to have sub-threads we need to check tgid. | |
3260259f HK |
1123 | * @tsk: Task structure to be checked. |
1124 | * | |
1125 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1126 | * |
1127 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1128 | */ |
e868171a | 1129 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 | 1130 | { |
570f5241 | 1131 | return task_tgid_nr(tsk) == 1; |
b461cc03 | 1132 | } |
b460cbc5 | 1133 | |
9ec52099 CLG |
1134 | extern struct pid *cad_pid; |
1135 | ||
1da177e4 LT |
1136 | /* |
1137 | * Per process flags | |
1138 | */ | |
c1de45ca | 1139 | #define PF_IDLE 0x00000002 /* I am an IDLE thread */ |
1da177e4 | 1140 | #define PF_EXITING 0x00000004 /* getting shut down */ |
778e9a9c | 1141 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1142 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 1143 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 1144 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 1145 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
1146 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
1147 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1148 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1149 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
72fa5997 | 1150 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ |
1da177e4 | 1151 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
774a1221 | 1152 | #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */ |
1da177e4 LT |
1153 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1154 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1155 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1156 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
21caf2fc | 1157 | #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */ |
1da177e4 | 1158 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 1159 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
1160 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1161 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
14a40ffc | 1162 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ |
4db96cf0 | 1163 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
61a87122 | 1164 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
58a69cb4 | 1165 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
2b44c4db | 1166 | #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */ |
1da177e4 LT |
1167 | |
1168 | /* | |
1169 | * Only the _current_ task can read/write to tsk->flags, but other | |
1170 | * tasks can access tsk->flags in readonly mode for example | |
1171 | * with tsk_used_math (like during threaded core dumping). | |
1172 | * There is however an exception to this rule during ptrace | |
1173 | * or during fork: the ptracer task is allowed to write to the | |
1174 | * child->flags of its traced child (same goes for fork, the parent | |
1175 | * can write to the child->flags), because we're guaranteed the | |
1176 | * child is not running and in turn not changing child->flags | |
1177 | * at the same time the parent does it. | |
1178 | */ | |
1179 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1180 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1181 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1182 | #define set_used_math() set_stopped_child_used_math(current) | |
1183 | #define conditional_stopped_child_used_math(condition, child) \ | |
1184 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1185 | #define conditional_used_math(condition) \ | |
1186 | conditional_stopped_child_used_math(condition, current) | |
1187 | #define copy_to_stopped_child_used_math(child) \ | |
1188 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1189 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1190 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1191 | #define used_math() tsk_used_math(current) | |
1192 | ||
1d4457f9 | 1193 | /* Per-process atomic flags. */ |
a2b86f77 | 1194 | #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ |
2ad654bc ZL |
1195 | #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ |
1196 | #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ | |
77ed2c57 | 1197 | #define PFA_LMK_WAITING 3 /* Lowmemorykiller is waiting */ |
2ad654bc | 1198 | |
1d4457f9 | 1199 | |
e0e5070b ZL |
1200 | #define TASK_PFA_TEST(name, func) \ |
1201 | static inline bool task_##func(struct task_struct *p) \ | |
1202 | { return test_bit(PFA_##name, &p->atomic_flags); } | |
1203 | #define TASK_PFA_SET(name, func) \ | |
1204 | static inline void task_set_##func(struct task_struct *p) \ | |
1205 | { set_bit(PFA_##name, &p->atomic_flags); } | |
1206 | #define TASK_PFA_CLEAR(name, func) \ | |
1207 | static inline void task_clear_##func(struct task_struct *p) \ | |
1208 | { clear_bit(PFA_##name, &p->atomic_flags); } | |
1209 | ||
1210 | TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) | |
1211 | TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) | |
1d4457f9 | 1212 | |
2ad654bc ZL |
1213 | TASK_PFA_TEST(SPREAD_PAGE, spread_page) |
1214 | TASK_PFA_SET(SPREAD_PAGE, spread_page) | |
1215 | TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) | |
1216 | ||
1217 | TASK_PFA_TEST(SPREAD_SLAB, spread_slab) | |
1218 | TASK_PFA_SET(SPREAD_SLAB, spread_slab) | |
1219 | TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) | |
1d4457f9 | 1220 | |
77ed2c57 TH |
1221 | TASK_PFA_TEST(LMK_WAITING, lmk_waiting) |
1222 | TASK_PFA_SET(LMK_WAITING, lmk_waiting) | |
1223 | ||
907aed48 MG |
1224 | static inline void tsk_restore_flags(struct task_struct *task, |
1225 | unsigned long orig_flags, unsigned long flags) | |
1226 | { | |
1227 | task->flags &= ~flags; | |
1228 | task->flags |= orig_flags & flags; | |
1229 | } | |
1230 | ||
f82f8042 JL |
1231 | extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, |
1232 | const struct cpumask *trial); | |
7f51412a JL |
1233 | extern int task_can_attach(struct task_struct *p, |
1234 | const struct cpumask *cs_cpus_allowed); | |
1da177e4 | 1235 | #ifdef CONFIG_SMP |
1e1b6c51 KM |
1236 | extern void do_set_cpus_allowed(struct task_struct *p, |
1237 | const struct cpumask *new_mask); | |
1238 | ||
cd8ba7cd | 1239 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1240 | const struct cpumask *new_mask); |
1da177e4 | 1241 | #else |
1e1b6c51 KM |
1242 | static inline void do_set_cpus_allowed(struct task_struct *p, |
1243 | const struct cpumask *new_mask) | |
1244 | { | |
1245 | } | |
cd8ba7cd | 1246 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1247 | const struct cpumask *new_mask) |
1da177e4 | 1248 | { |
96f874e2 | 1249 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1250 | return -EINVAL; |
1251 | return 0; | |
1252 | } | |
1253 | #endif | |
e0ad9556 | 1254 | |
6d0d2878 CB |
1255 | #ifndef cpu_relax_yield |
1256 | #define cpu_relax_yield() cpu_relax() | |
1257 | #endif | |
1258 | ||
fa93384f | 1259 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
1260 | extern void set_user_nice(struct task_struct *p, long nice); |
1261 | extern int task_prio(const struct task_struct *p); | |
d0ea0268 DY |
1262 | /** |
1263 | * task_nice - return the nice value of a given task. | |
1264 | * @p: the task in question. | |
1265 | * | |
1266 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
1267 | */ | |
1268 | static inline int task_nice(const struct task_struct *p) | |
1269 | { | |
1270 | return PRIO_TO_NICE((p)->static_prio); | |
1271 | } | |
36c8b586 IM |
1272 | extern int can_nice(const struct task_struct *p, const int nice); |
1273 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 1274 | extern int idle_cpu(int cpu); |
fe7de49f KM |
1275 | extern int sched_setscheduler(struct task_struct *, int, |
1276 | const struct sched_param *); | |
961ccddd | 1277 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 1278 | const struct sched_param *); |
d50dde5a DF |
1279 | extern int sched_setattr(struct task_struct *, |
1280 | const struct sched_attr *); | |
36c8b586 | 1281 | extern struct task_struct *idle_task(int cpu); |
c4f30608 PM |
1282 | /** |
1283 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 1284 | * @p: the task in question. |
e69f6186 YB |
1285 | * |
1286 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 1287 | */ |
7061ca3b | 1288 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 | 1289 | { |
c1de45ca | 1290 | return !!(p->flags & PF_IDLE); |
c4f30608 | 1291 | } |
36c8b586 | 1292 | extern struct task_struct *curr_task(int cpu); |
a458ae2e | 1293 | extern void ia64_set_curr_task(int cpu, struct task_struct *p); |
1da177e4 LT |
1294 | |
1295 | void yield(void); | |
1296 | ||
1da177e4 | 1297 | union thread_union { |
c65eacbe | 1298 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1da177e4 | 1299 | struct thread_info thread_info; |
c65eacbe | 1300 | #endif |
1da177e4 LT |
1301 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
1302 | }; | |
1303 | ||
f3ac6067 IM |
1304 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
1305 | static inline struct thread_info *task_thread_info(struct task_struct *task) | |
1306 | { | |
1307 | return &task->thread_info; | |
1308 | } | |
1309 | #elif !defined(__HAVE_THREAD_FUNCTIONS) | |
1310 | # define task_thread_info(task) ((struct thread_info *)(task)->stack) | |
1311 | #endif | |
1312 | ||
198fe21b PE |
1313 | extern struct pid_namespace init_pid_ns; |
1314 | ||
1315 | /* | |
1316 | * find a task by one of its numerical ids | |
1317 | * | |
198fe21b PE |
1318 | * find_task_by_pid_ns(): |
1319 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1320 | * find_task_by_vpid(): |
1321 | * finds a task by its virtual pid | |
198fe21b | 1322 | * |
e49859e7 | 1323 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
1324 | */ |
1325 | ||
228ebcbe PE |
1326 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
1327 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
1328 | struct pid_namespace *ns); | |
198fe21b | 1329 | |
b3c97528 HH |
1330 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
1331 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 1332 | extern void wake_up_new_task(struct task_struct *tsk); |
1da177e4 LT |
1333 | #ifdef CONFIG_SMP |
1334 | extern void kick_process(struct task_struct *tsk); | |
1335 | #else | |
1336 | static inline void kick_process(struct task_struct *tsk) { } | |
1337 | #endif | |
1da177e4 | 1338 | |
82b89778 AH |
1339 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
1340 | static inline void set_task_comm(struct task_struct *tsk, const char *from) | |
1341 | { | |
1342 | __set_task_comm(tsk, from, false); | |
1343 | } | |
59714d65 | 1344 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
1345 | |
1346 | #ifdef CONFIG_SMP | |
317f3941 | 1347 | void scheduler_ipi(void); |
85ba2d86 | 1348 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 1349 | #else |
184748cc | 1350 | static inline void scheduler_ipi(void) { } |
85ba2d86 RM |
1351 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
1352 | long match_state) | |
1353 | { | |
1354 | return 1; | |
1355 | } | |
1da177e4 LT |
1356 | #endif |
1357 | ||
1da177e4 LT |
1358 | /* set thread flags in other task's structures |
1359 | * - see asm/thread_info.h for TIF_xxxx flags available | |
1360 | */ | |
1361 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1362 | { | |
a1261f54 | 1363 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1364 | } |
1365 | ||
1366 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1367 | { | |
a1261f54 | 1368 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1369 | } |
1370 | ||
1371 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1372 | { | |
a1261f54 | 1373 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1374 | } |
1375 | ||
1376 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1377 | { | |
a1261f54 | 1378 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1379 | } |
1380 | ||
1381 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1382 | { | |
a1261f54 | 1383 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1384 | } |
1385 | ||
1386 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
1387 | { | |
1388 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1389 | } | |
1390 | ||
1391 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
1392 | { | |
1393 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1394 | } | |
1395 | ||
8ae121ac GH |
1396 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
1397 | { | |
1398 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
1399 | } | |
1400 | ||
1da177e4 LT |
1401 | /* |
1402 | * cond_resched() and cond_resched_lock(): latency reduction via | |
1403 | * explicit rescheduling in places that are safe. The return | |
1404 | * value indicates whether a reschedule was done in fact. | |
1405 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1406 | * cond_resched_softirq() will enable bhs before scheduling. | |
1407 | */ | |
35a773a0 | 1408 | #ifndef CONFIG_PREEMPT |
c3921ab7 | 1409 | extern int _cond_resched(void); |
35a773a0 PZ |
1410 | #else |
1411 | static inline int _cond_resched(void) { return 0; } | |
1412 | #endif | |
6f80bd98 | 1413 | |
613afbf8 | 1414 | #define cond_resched() ({ \ |
3427445a | 1415 | ___might_sleep(__FILE__, __LINE__, 0); \ |
613afbf8 FW |
1416 | _cond_resched(); \ |
1417 | }) | |
6f80bd98 | 1418 | |
613afbf8 FW |
1419 | extern int __cond_resched_lock(spinlock_t *lock); |
1420 | ||
1421 | #define cond_resched_lock(lock) ({ \ | |
3427445a | 1422 | ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\ |
613afbf8 FW |
1423 | __cond_resched_lock(lock); \ |
1424 | }) | |
1425 | ||
1426 | extern int __cond_resched_softirq(void); | |
1427 | ||
75e1056f | 1428 | #define cond_resched_softirq() ({ \ |
3427445a | 1429 | ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ |
75e1056f | 1430 | __cond_resched_softirq(); \ |
613afbf8 | 1431 | }) |
1da177e4 | 1432 | |
f6f3c437 SH |
1433 | static inline void cond_resched_rcu(void) |
1434 | { | |
1435 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
1436 | rcu_read_unlock(); | |
1437 | cond_resched(); | |
1438 | rcu_read_lock(); | |
1439 | #endif | |
1440 | } | |
1441 | ||
1da177e4 LT |
1442 | /* |
1443 | * Does a critical section need to be broken due to another | |
95c354fe NP |
1444 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
1445 | * but a general need for low latency) | |
1da177e4 | 1446 | */ |
95c354fe | 1447 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 1448 | { |
95c354fe NP |
1449 | #ifdef CONFIG_PREEMPT |
1450 | return spin_is_contended(lock); | |
1451 | #else | |
1da177e4 | 1452 | return 0; |
95c354fe | 1453 | #endif |
1da177e4 LT |
1454 | } |
1455 | ||
75f93fed PZ |
1456 | static __always_inline bool need_resched(void) |
1457 | { | |
1458 | return unlikely(tif_need_resched()); | |
1459 | } | |
1460 | ||
1da177e4 LT |
1461 | /* |
1462 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
1463 | */ | |
1464 | #ifdef CONFIG_SMP | |
1465 | ||
1466 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1467 | { | |
c65eacbe AL |
1468 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
1469 | return p->cpu; | |
1470 | #else | |
a1261f54 | 1471 | return task_thread_info(p)->cpu; |
c65eacbe | 1472 | #endif |
1da177e4 LT |
1473 | } |
1474 | ||
b32e86b4 IM |
1475 | static inline int task_node(const struct task_struct *p) |
1476 | { | |
1477 | return cpu_to_node(task_cpu(p)); | |
1478 | } | |
1479 | ||
c65cc870 | 1480 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
1481 | |
1482 | #else | |
1483 | ||
1484 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1485 | { | |
1486 | return 0; | |
1487 | } | |
1488 | ||
1489 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
1490 | { | |
1491 | } | |
1492 | ||
1493 | #endif /* CONFIG_SMP */ | |
1494 | ||
d9345c65 PX |
1495 | /* |
1496 | * In order to reduce various lock holder preemption latencies provide an | |
1497 | * interface to see if a vCPU is currently running or not. | |
1498 | * | |
1499 | * This allows us to terminate optimistic spin loops and block, analogous to | |
1500 | * the native optimistic spin heuristic of testing if the lock owner task is | |
1501 | * running or not. | |
1502 | */ | |
1503 | #ifndef vcpu_is_preempted | |
1504 | # define vcpu_is_preempted(cpu) false | |
1505 | #endif | |
1506 | ||
96f874e2 RR |
1507 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
1508 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 1509 | |
82455257 DH |
1510 | #ifndef TASK_SIZE_OF |
1511 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
1512 | #endif | |
1513 | ||
1da177e4 | 1514 | #endif |