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1da177e4 LT |
1 | #ifndef _LINUX_SCHED_H |
2 | #define _LINUX_SCHED_H | |
3 | ||
5eca1c10 IM |
4 | /* |
5 | * Define 'struct task_struct' and provide the main scheduler | |
6 | * APIs (schedule(), wakeup variants, etc.) | |
7 | */ | |
b7b3c76a | 8 | |
5eca1c10 | 9 | #include <uapi/linux/sched.h> |
5c228079 | 10 | |
5eca1c10 | 11 | #include <asm/current.h> |
1da177e4 | 12 | |
5eca1c10 | 13 | #include <linux/pid.h> |
1da177e4 | 14 | #include <linux/sem.h> |
ab602f79 | 15 | #include <linux/shm.h> |
5eca1c10 IM |
16 | #include <linux/kcov.h> |
17 | #include <linux/mutex.h> | |
18 | #include <linux/plist.h> | |
19 | #include <linux/hrtimer.h> | |
1da177e4 | 20 | #include <linux/seccomp.h> |
5eca1c10 | 21 | #include <linux/nodemask.h> |
b68070e1 | 22 | #include <linux/rcupdate.h> |
a3b6714e | 23 | #include <linux/resource.h> |
9745512c | 24 | #include <linux/latencytop.h> |
5eca1c10 IM |
25 | #include <linux/sched/prio.h> |
26 | #include <linux/signal_types.h> | |
27 | #include <linux/mm_types_task.h> | |
28 | #include <linux/task_io_accounting.h> | |
a3b6714e | 29 | |
5eca1c10 | 30 | /* task_struct member predeclarations (sorted alphabetically): */ |
c7af7877 | 31 | struct audit_context; |
c7af7877 | 32 | struct backing_dev_info; |
bddd87c7 | 33 | struct bio_list; |
73c10101 | 34 | struct blk_plug; |
c7af7877 | 35 | struct cfs_rq; |
c7af7877 IM |
36 | struct fs_struct; |
37 | struct futex_pi_state; | |
38 | struct io_context; | |
39 | struct mempolicy; | |
89076bc3 | 40 | struct nameidata; |
c7af7877 IM |
41 | struct nsproxy; |
42 | struct perf_event_context; | |
43 | struct pid_namespace; | |
44 | struct pipe_inode_info; | |
45 | struct rcu_node; | |
46 | struct reclaim_state; | |
47 | struct robust_list_head; | |
48 | struct sched_attr; | |
49 | struct sched_param; | |
43ae34cb | 50 | struct seq_file; |
c7af7877 IM |
51 | struct sighand_struct; |
52 | struct signal_struct; | |
53 | struct task_delay_info; | |
4cf86d77 | 54 | struct task_group; |
1da177e4 | 55 | |
4a8342d2 LT |
56 | /* |
57 | * Task state bitmask. NOTE! These bits are also | |
58 | * encoded in fs/proc/array.c: get_task_state(). | |
59 | * | |
60 | * We have two separate sets of flags: task->state | |
61 | * is about runnability, while task->exit_state are | |
62 | * about the task exiting. Confusing, but this way | |
63 | * modifying one set can't modify the other one by | |
64 | * mistake. | |
65 | */ | |
5eca1c10 IM |
66 | |
67 | /* Used in tsk->state: */ | |
68 | #define TASK_RUNNING 0 | |
69 | #define TASK_INTERRUPTIBLE 1 | |
70 | #define TASK_UNINTERRUPTIBLE 2 | |
71 | #define __TASK_STOPPED 4 | |
72 | #define __TASK_TRACED 8 | |
73 | /* Used in tsk->exit_state: */ | |
74 | #define EXIT_DEAD 16 | |
75 | #define EXIT_ZOMBIE 32 | |
76 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) | |
77 | /* Used in tsk->state again: */ | |
78 | #define TASK_DEAD 64 | |
79 | #define TASK_WAKEKILL 128 | |
80 | #define TASK_WAKING 256 | |
81 | #define TASK_PARKED 512 | |
82 | #define TASK_NOLOAD 1024 | |
83 | #define TASK_NEW 2048 | |
84 | #define TASK_STATE_MAX 4096 | |
85 | ||
86 | #define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPNn" | |
87 | ||
88 | /* Convenience macros for the sake of set_current_state: */ | |
89 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
90 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
91 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
92 | ||
93 | #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD) | |
94 | ||
95 | /* Convenience macros for the sake of wake_up(): */ | |
96 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
97 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) | |
98 | ||
99 | /* get_task_state(): */ | |
100 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
101 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ | |
102 | __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD) | |
103 | ||
104 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) | |
105 | ||
106 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
107 | ||
108 | #define task_is_stopped_or_traced(task) ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) | |
109 | ||
110 | #define task_contributes_to_load(task) ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ | |
111 | (task->flags & PF_FROZEN) == 0 && \ | |
112 | (task->state & TASK_NOLOAD) == 0) | |
1da177e4 | 113 | |
8eb23b9f PZ |
114 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
115 | ||
8eb23b9f PZ |
116 | #define __set_current_state(state_value) \ |
117 | do { \ | |
118 | current->task_state_change = _THIS_IP_; \ | |
119 | current->state = (state_value); \ | |
120 | } while (0) | |
121 | #define set_current_state(state_value) \ | |
122 | do { \ | |
123 | current->task_state_change = _THIS_IP_; \ | |
a2250238 | 124 | smp_store_mb(current->state, (state_value)); \ |
8eb23b9f PZ |
125 | } while (0) |
126 | ||
127 | #else | |
498d0c57 AM |
128 | /* |
129 | * set_current_state() includes a barrier so that the write of current->state | |
130 | * is correctly serialised wrt the caller's subsequent test of whether to | |
131 | * actually sleep: | |
132 | * | |
a2250238 | 133 | * for (;;) { |
498d0c57 | 134 | * set_current_state(TASK_UNINTERRUPTIBLE); |
a2250238 PZ |
135 | * if (!need_sleep) |
136 | * break; | |
137 | * | |
138 | * schedule(); | |
139 | * } | |
140 | * __set_current_state(TASK_RUNNING); | |
141 | * | |
142 | * If the caller does not need such serialisation (because, for instance, the | |
143 | * condition test and condition change and wakeup are under the same lock) then | |
144 | * use __set_current_state(). | |
145 | * | |
146 | * The above is typically ordered against the wakeup, which does: | |
147 | * | |
148 | * need_sleep = false; | |
149 | * wake_up_state(p, TASK_UNINTERRUPTIBLE); | |
150 | * | |
151 | * Where wake_up_state() (and all other wakeup primitives) imply enough | |
152 | * barriers to order the store of the variable against wakeup. | |
153 | * | |
154 | * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is, | |
155 | * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a | |
156 | * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING). | |
498d0c57 | 157 | * |
a2250238 | 158 | * This is obviously fine, since they both store the exact same value. |
498d0c57 | 159 | * |
a2250238 | 160 | * Also see the comments of try_to_wake_up(). |
498d0c57 | 161 | */ |
5eca1c10 IM |
162 | #define __set_current_state(state_value) do { current->state = (state_value); } while (0) |
163 | #define set_current_state(state_value) smp_store_mb(current->state, (state_value)) | |
8eb23b9f PZ |
164 | #endif |
165 | ||
5eca1c10 IM |
166 | /* Task command name length: */ |
167 | #define TASK_COMM_LEN 16 | |
1da177e4 | 168 | |
5eca1c10 | 169 | extern cpumask_var_t cpu_isolated_map; |
3fa0818b | 170 | |
1da177e4 LT |
171 | extern void scheduler_tick(void); |
172 | ||
5eca1c10 IM |
173 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
174 | ||
175 | extern long schedule_timeout(long timeout); | |
176 | extern long schedule_timeout_interruptible(long timeout); | |
177 | extern long schedule_timeout_killable(long timeout); | |
178 | extern long schedule_timeout_uninterruptible(long timeout); | |
179 | extern long schedule_timeout_idle(long timeout); | |
1da177e4 | 180 | asmlinkage void schedule(void); |
c5491ea7 | 181 | extern void schedule_preempt_disabled(void); |
1da177e4 | 182 | |
10ab5643 TH |
183 | extern int __must_check io_schedule_prepare(void); |
184 | extern void io_schedule_finish(int token); | |
9cff8ade | 185 | extern long io_schedule_timeout(long timeout); |
10ab5643 | 186 | extern void io_schedule(void); |
9cff8ade | 187 | |
d37f761d | 188 | /** |
0ba42a59 | 189 | * struct prev_cputime - snapshot of system and user cputime |
d37f761d FW |
190 | * @utime: time spent in user mode |
191 | * @stime: time spent in system mode | |
9d7fb042 | 192 | * @lock: protects the above two fields |
d37f761d | 193 | * |
9d7fb042 PZ |
194 | * Stores previous user/system time values such that we can guarantee |
195 | * monotonicity. | |
d37f761d | 196 | */ |
9d7fb042 PZ |
197 | struct prev_cputime { |
198 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
5eca1c10 IM |
199 | u64 utime; |
200 | u64 stime; | |
201 | raw_spinlock_t lock; | |
9d7fb042 | 202 | #endif |
d37f761d FW |
203 | }; |
204 | ||
f06febc9 FM |
205 | /** |
206 | * struct task_cputime - collected CPU time counts | |
5613fda9 FW |
207 | * @utime: time spent in user mode, in nanoseconds |
208 | * @stime: time spent in kernel mode, in nanoseconds | |
f06febc9 | 209 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds |
5ce73a4a | 210 | * |
9d7fb042 PZ |
211 | * This structure groups together three kinds of CPU time that are tracked for |
212 | * threads and thread groups. Most things considering CPU time want to group | |
213 | * these counts together and treat all three of them in parallel. | |
f06febc9 FM |
214 | */ |
215 | struct task_cputime { | |
5eca1c10 IM |
216 | u64 utime; |
217 | u64 stime; | |
218 | unsigned long long sum_exec_runtime; | |
f06febc9 | 219 | }; |
9d7fb042 | 220 | |
5eca1c10 IM |
221 | /* Alternate field names when used on cache expirations: */ |
222 | #define virt_exp utime | |
223 | #define prof_exp stime | |
224 | #define sched_exp sum_exec_runtime | |
f06febc9 | 225 | |
bac5b6b6 FW |
226 | enum vtime_state { |
227 | /* Task is sleeping or running in a CPU with VTIME inactive: */ | |
228 | VTIME_INACTIVE = 0, | |
229 | /* Task runs in userspace in a CPU with VTIME active: */ | |
230 | VTIME_USER, | |
231 | /* Task runs in kernelspace in a CPU with VTIME active: */ | |
232 | VTIME_SYS, | |
233 | }; | |
234 | ||
235 | struct vtime { | |
236 | seqcount_t seqcount; | |
237 | unsigned long long starttime; | |
238 | enum vtime_state state; | |
2a42eb95 WL |
239 | u64 utime; |
240 | u64 stime; | |
241 | u64 gtime; | |
bac5b6b6 FW |
242 | }; |
243 | ||
1da177e4 | 244 | struct sched_info { |
7f5f8e8d | 245 | #ifdef CONFIG_SCHED_INFO |
5eca1c10 IM |
246 | /* Cumulative counters: */ |
247 | ||
248 | /* # of times we have run on this CPU: */ | |
249 | unsigned long pcount; | |
250 | ||
251 | /* Time spent waiting on a runqueue: */ | |
252 | unsigned long long run_delay; | |
253 | ||
254 | /* Timestamps: */ | |
255 | ||
256 | /* When did we last run on a CPU? */ | |
257 | unsigned long long last_arrival; | |
258 | ||
259 | /* When were we last queued to run? */ | |
260 | unsigned long long last_queued; | |
1da177e4 | 261 | |
f6db8347 | 262 | #endif /* CONFIG_SCHED_INFO */ |
7f5f8e8d | 263 | }; |
1da177e4 | 264 | |
6ecdd749 YD |
265 | /* |
266 | * Integer metrics need fixed point arithmetic, e.g., sched/fair | |
267 | * has a few: load, load_avg, util_avg, freq, and capacity. | |
268 | * | |
269 | * We define a basic fixed point arithmetic range, and then formalize | |
270 | * all these metrics based on that basic range. | |
271 | */ | |
5eca1c10 IM |
272 | # define SCHED_FIXEDPOINT_SHIFT 10 |
273 | # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT) | |
6ecdd749 | 274 | |
20b8a59f | 275 | struct load_weight { |
5eca1c10 IM |
276 | unsigned long weight; |
277 | u32 inv_weight; | |
20b8a59f IM |
278 | }; |
279 | ||
9d89c257 | 280 | /* |
7b595334 YD |
281 | * The load_avg/util_avg accumulates an infinite geometric series |
282 | * (see __update_load_avg() in kernel/sched/fair.c). | |
283 | * | |
284 | * [load_avg definition] | |
285 | * | |
286 | * load_avg = runnable% * scale_load_down(load) | |
287 | * | |
288 | * where runnable% is the time ratio that a sched_entity is runnable. | |
289 | * For cfs_rq, it is the aggregated load_avg of all runnable and | |
9d89c257 | 290 | * blocked sched_entities. |
7b595334 YD |
291 | * |
292 | * load_avg may also take frequency scaling into account: | |
293 | * | |
294 | * load_avg = runnable% * scale_load_down(load) * freq% | |
295 | * | |
296 | * where freq% is the CPU frequency normalized to the highest frequency. | |
297 | * | |
298 | * [util_avg definition] | |
299 | * | |
300 | * util_avg = running% * SCHED_CAPACITY_SCALE | |
301 | * | |
302 | * where running% is the time ratio that a sched_entity is running on | |
303 | * a CPU. For cfs_rq, it is the aggregated util_avg of all runnable | |
304 | * and blocked sched_entities. | |
305 | * | |
306 | * util_avg may also factor frequency scaling and CPU capacity scaling: | |
307 | * | |
308 | * util_avg = running% * SCHED_CAPACITY_SCALE * freq% * capacity% | |
309 | * | |
310 | * where freq% is the same as above, and capacity% is the CPU capacity | |
311 | * normalized to the greatest capacity (due to uarch differences, etc). | |
312 | * | |
313 | * N.B., the above ratios (runnable%, running%, freq%, and capacity%) | |
314 | * themselves are in the range of [0, 1]. To do fixed point arithmetics, | |
315 | * we therefore scale them to as large a range as necessary. This is for | |
316 | * example reflected by util_avg's SCHED_CAPACITY_SCALE. | |
317 | * | |
318 | * [Overflow issue] | |
319 | * | |
320 | * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities | |
321 | * with the highest load (=88761), always runnable on a single cfs_rq, | |
322 | * and should not overflow as the number already hits PID_MAX_LIMIT. | |
323 | * | |
324 | * For all other cases (including 32-bit kernels), struct load_weight's | |
325 | * weight will overflow first before we do, because: | |
326 | * | |
327 | * Max(load_avg) <= Max(load.weight) | |
328 | * | |
329 | * Then it is the load_weight's responsibility to consider overflow | |
330 | * issues. | |
9d89c257 | 331 | */ |
9d85f21c | 332 | struct sched_avg { |
5eca1c10 IM |
333 | u64 last_update_time; |
334 | u64 load_sum; | |
335 | u32 util_sum; | |
336 | u32 period_contrib; | |
337 | unsigned long load_avg; | |
338 | unsigned long util_avg; | |
9d85f21c PT |
339 | }; |
340 | ||
41acab88 | 341 | struct sched_statistics { |
7f5f8e8d | 342 | #ifdef CONFIG_SCHEDSTATS |
5eca1c10 IM |
343 | u64 wait_start; |
344 | u64 wait_max; | |
345 | u64 wait_count; | |
346 | u64 wait_sum; | |
347 | u64 iowait_count; | |
348 | u64 iowait_sum; | |
349 | ||
350 | u64 sleep_start; | |
351 | u64 sleep_max; | |
352 | s64 sum_sleep_runtime; | |
353 | ||
354 | u64 block_start; | |
355 | u64 block_max; | |
356 | u64 exec_max; | |
357 | u64 slice_max; | |
358 | ||
359 | u64 nr_migrations_cold; | |
360 | u64 nr_failed_migrations_affine; | |
361 | u64 nr_failed_migrations_running; | |
362 | u64 nr_failed_migrations_hot; | |
363 | u64 nr_forced_migrations; | |
364 | ||
365 | u64 nr_wakeups; | |
366 | u64 nr_wakeups_sync; | |
367 | u64 nr_wakeups_migrate; | |
368 | u64 nr_wakeups_local; | |
369 | u64 nr_wakeups_remote; | |
370 | u64 nr_wakeups_affine; | |
371 | u64 nr_wakeups_affine_attempts; | |
372 | u64 nr_wakeups_passive; | |
373 | u64 nr_wakeups_idle; | |
41acab88 | 374 | #endif |
7f5f8e8d | 375 | }; |
41acab88 LDM |
376 | |
377 | struct sched_entity { | |
5eca1c10 IM |
378 | /* For load-balancing: */ |
379 | struct load_weight load; | |
380 | struct rb_node run_node; | |
381 | struct list_head group_node; | |
382 | unsigned int on_rq; | |
41acab88 | 383 | |
5eca1c10 IM |
384 | u64 exec_start; |
385 | u64 sum_exec_runtime; | |
386 | u64 vruntime; | |
387 | u64 prev_sum_exec_runtime; | |
41acab88 | 388 | |
5eca1c10 | 389 | u64 nr_migrations; |
41acab88 | 390 | |
5eca1c10 | 391 | struct sched_statistics statistics; |
94c18227 | 392 | |
20b8a59f | 393 | #ifdef CONFIG_FAIR_GROUP_SCHED |
5eca1c10 IM |
394 | int depth; |
395 | struct sched_entity *parent; | |
20b8a59f | 396 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 397 | struct cfs_rq *cfs_rq; |
20b8a59f | 398 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 399 | struct cfs_rq *my_q; |
20b8a59f | 400 | #endif |
8bd75c77 | 401 | |
141965c7 | 402 | #ifdef CONFIG_SMP |
5a107804 JO |
403 | /* |
404 | * Per entity load average tracking. | |
405 | * | |
406 | * Put into separate cache line so it does not | |
407 | * collide with read-mostly values above. | |
408 | */ | |
5eca1c10 | 409 | struct sched_avg avg ____cacheline_aligned_in_smp; |
9d85f21c | 410 | #endif |
20b8a59f | 411 | }; |
70b97a7f | 412 | |
fa717060 | 413 | struct sched_rt_entity { |
5eca1c10 IM |
414 | struct list_head run_list; |
415 | unsigned long timeout; | |
416 | unsigned long watchdog_stamp; | |
417 | unsigned int time_slice; | |
418 | unsigned short on_rq; | |
419 | unsigned short on_list; | |
420 | ||
421 | struct sched_rt_entity *back; | |
052f1dc7 | 422 | #ifdef CONFIG_RT_GROUP_SCHED |
5eca1c10 | 423 | struct sched_rt_entity *parent; |
6f505b16 | 424 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 425 | struct rt_rq *rt_rq; |
6f505b16 | 426 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 427 | struct rt_rq *my_q; |
6f505b16 | 428 | #endif |
3859a271 | 429 | } __randomize_layout; |
fa717060 | 430 | |
aab03e05 | 431 | struct sched_dl_entity { |
5eca1c10 | 432 | struct rb_node rb_node; |
aab03e05 DF |
433 | |
434 | /* | |
435 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 436 | * during sched_setattr(), they will remain the same until |
437 | * the next sched_setattr(). | |
aab03e05 | 438 | */ |
5eca1c10 IM |
439 | u64 dl_runtime; /* Maximum runtime for each instance */ |
440 | u64 dl_deadline; /* Relative deadline of each instance */ | |
441 | u64 dl_period; /* Separation of two instances (period) */ | |
54d6d303 | 442 | u64 dl_bw; /* dl_runtime / dl_period */ |
3effcb42 | 443 | u64 dl_density; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
444 | |
445 | /* | |
446 | * Actual scheduling parameters. Initialized with the values above, | |
447 | * they are continously updated during task execution. Note that | |
448 | * the remaining runtime could be < 0 in case we are in overrun. | |
449 | */ | |
5eca1c10 IM |
450 | s64 runtime; /* Remaining runtime for this instance */ |
451 | u64 deadline; /* Absolute deadline for this instance */ | |
452 | unsigned int flags; /* Specifying the scheduler behaviour */ | |
aab03e05 DF |
453 | |
454 | /* | |
455 | * Some bool flags: | |
456 | * | |
457 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
458 | * task has to wait for a replenishment to be performed at the | |
459 | * next firing of dl_timer. | |
460 | * | |
2d3d891d DF |
461 | * @dl_boosted tells if we are boosted due to DI. If so we are |
462 | * outside bandwidth enforcement mechanism (but only until we | |
5bfd126e JL |
463 | * exit the critical section); |
464 | * | |
5eca1c10 | 465 | * @dl_yielded tells if task gave up the CPU before consuming |
5bfd126e | 466 | * all its available runtime during the last job. |
209a0cbd LA |
467 | * |
468 | * @dl_non_contending tells if the task is inactive while still | |
469 | * contributing to the active utilization. In other words, it | |
470 | * indicates if the inactive timer has been armed and its handler | |
471 | * has not been executed yet. This flag is useful to avoid race | |
472 | * conditions between the inactive timer handler and the wakeup | |
473 | * code. | |
aab03e05 | 474 | */ |
5eca1c10 IM |
475 | int dl_throttled; |
476 | int dl_boosted; | |
477 | int dl_yielded; | |
209a0cbd | 478 | int dl_non_contending; |
aab03e05 DF |
479 | |
480 | /* | |
481 | * Bandwidth enforcement timer. Each -deadline task has its | |
482 | * own bandwidth to be enforced, thus we need one timer per task. | |
483 | */ | |
5eca1c10 | 484 | struct hrtimer dl_timer; |
209a0cbd LA |
485 | |
486 | /* | |
487 | * Inactive timer, responsible for decreasing the active utilization | |
488 | * at the "0-lag time". When a -deadline task blocks, it contributes | |
489 | * to GRUB's active utilization until the "0-lag time", hence a | |
490 | * timer is needed to decrease the active utilization at the correct | |
491 | * time. | |
492 | */ | |
493 | struct hrtimer inactive_timer; | |
aab03e05 | 494 | }; |
8bd75c77 | 495 | |
1d082fd0 PM |
496 | union rcu_special { |
497 | struct { | |
5eca1c10 IM |
498 | u8 blocked; |
499 | u8 need_qs; | |
500 | u8 exp_need_qs; | |
501 | ||
502 | /* Otherwise the compiler can store garbage here: */ | |
503 | u8 pad; | |
8203d6d0 PM |
504 | } b; /* Bits. */ |
505 | u32 s; /* Set of bits. */ | |
1d082fd0 | 506 | }; |
86848966 | 507 | |
8dc85d54 PZ |
508 | enum perf_event_task_context { |
509 | perf_invalid_context = -1, | |
510 | perf_hw_context = 0, | |
89a1e187 | 511 | perf_sw_context, |
8dc85d54 PZ |
512 | perf_nr_task_contexts, |
513 | }; | |
514 | ||
eb61baf6 IM |
515 | struct wake_q_node { |
516 | struct wake_q_node *next; | |
517 | }; | |
518 | ||
1da177e4 | 519 | struct task_struct { |
c65eacbe AL |
520 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
521 | /* | |
522 | * For reasons of header soup (see current_thread_info()), this | |
523 | * must be the first element of task_struct. | |
524 | */ | |
5eca1c10 | 525 | struct thread_info thread_info; |
c65eacbe | 526 | #endif |
5eca1c10 IM |
527 | /* -1 unrunnable, 0 runnable, >0 stopped: */ |
528 | volatile long state; | |
29e48ce8 KC |
529 | |
530 | /* | |
531 | * This begins the randomizable portion of task_struct. Only | |
532 | * scheduling-critical items should be added above here. | |
533 | */ | |
534 | randomized_struct_fields_start | |
535 | ||
5eca1c10 IM |
536 | void *stack; |
537 | atomic_t usage; | |
538 | /* Per task flags (PF_*), defined further below: */ | |
539 | unsigned int flags; | |
540 | unsigned int ptrace; | |
1da177e4 | 541 | |
2dd73a4f | 542 | #ifdef CONFIG_SMP |
5eca1c10 IM |
543 | struct llist_node wake_entry; |
544 | int on_cpu; | |
c65eacbe | 545 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
5eca1c10 IM |
546 | /* Current CPU: */ |
547 | unsigned int cpu; | |
c65eacbe | 548 | #endif |
5eca1c10 IM |
549 | unsigned int wakee_flips; |
550 | unsigned long wakee_flip_decay_ts; | |
551 | struct task_struct *last_wakee; | |
ac66f547 | 552 | |
5eca1c10 | 553 | int wake_cpu; |
2dd73a4f | 554 | #endif |
5eca1c10 IM |
555 | int on_rq; |
556 | ||
557 | int prio; | |
558 | int static_prio; | |
559 | int normal_prio; | |
560 | unsigned int rt_priority; | |
50e645a8 | 561 | |
5eca1c10 IM |
562 | const struct sched_class *sched_class; |
563 | struct sched_entity se; | |
564 | struct sched_rt_entity rt; | |
8323f26c | 565 | #ifdef CONFIG_CGROUP_SCHED |
5eca1c10 | 566 | struct task_group *sched_task_group; |
8323f26c | 567 | #endif |
5eca1c10 | 568 | struct sched_dl_entity dl; |
1da177e4 | 569 | |
e107be36 | 570 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
5eca1c10 IM |
571 | /* List of struct preempt_notifier: */ |
572 | struct hlist_head preempt_notifiers; | |
e107be36 AK |
573 | #endif |
574 | ||
6c5c9341 | 575 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
5eca1c10 | 576 | unsigned int btrace_seq; |
6c5c9341 | 577 | #endif |
1da177e4 | 578 | |
5eca1c10 IM |
579 | unsigned int policy; |
580 | int nr_cpus_allowed; | |
581 | cpumask_t cpus_allowed; | |
1da177e4 | 582 | |
a57eb940 | 583 | #ifdef CONFIG_PREEMPT_RCU |
5eca1c10 IM |
584 | int rcu_read_lock_nesting; |
585 | union rcu_special rcu_read_unlock_special; | |
586 | struct list_head rcu_node_entry; | |
587 | struct rcu_node *rcu_blocked_node; | |
28f6569a | 588 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
5eca1c10 | 589 | |
8315f422 | 590 | #ifdef CONFIG_TASKS_RCU |
5eca1c10 IM |
591 | unsigned long rcu_tasks_nvcsw; |
592 | bool rcu_tasks_holdout; | |
593 | struct list_head rcu_tasks_holdout_list; | |
594 | int rcu_tasks_idle_cpu; | |
8315f422 | 595 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
e260be67 | 596 | |
5eca1c10 | 597 | struct sched_info sched_info; |
1da177e4 | 598 | |
5eca1c10 | 599 | struct list_head tasks; |
806c09a7 | 600 | #ifdef CONFIG_SMP |
5eca1c10 IM |
601 | struct plist_node pushable_tasks; |
602 | struct rb_node pushable_dl_tasks; | |
806c09a7 | 603 | #endif |
1da177e4 | 604 | |
5eca1c10 IM |
605 | struct mm_struct *mm; |
606 | struct mm_struct *active_mm; | |
314ff785 IM |
607 | |
608 | /* Per-thread vma caching: */ | |
5eca1c10 | 609 | struct vmacache vmacache; |
314ff785 | 610 | |
5eca1c10 IM |
611 | #ifdef SPLIT_RSS_COUNTING |
612 | struct task_rss_stat rss_stat; | |
34e55232 | 613 | #endif |
5eca1c10 IM |
614 | int exit_state; |
615 | int exit_code; | |
616 | int exit_signal; | |
617 | /* The signal sent when the parent dies: */ | |
618 | int pdeath_signal; | |
619 | /* JOBCTL_*, siglock protected: */ | |
620 | unsigned long jobctl; | |
621 | ||
622 | /* Used for emulating ABI behavior of previous Linux versions: */ | |
623 | unsigned int personality; | |
624 | ||
625 | /* Scheduler bits, serialized by scheduler locks: */ | |
626 | unsigned sched_reset_on_fork:1; | |
627 | unsigned sched_contributes_to_load:1; | |
628 | unsigned sched_migrated:1; | |
629 | unsigned sched_remote_wakeup:1; | |
630 | /* Force alignment to the next boundary: */ | |
631 | unsigned :0; | |
632 | ||
633 | /* Unserialized, strictly 'current' */ | |
634 | ||
635 | /* Bit to tell LSMs we're in execve(): */ | |
636 | unsigned in_execve:1; | |
637 | unsigned in_iowait:1; | |
638 | #ifndef TIF_RESTORE_SIGMASK | |
639 | unsigned restore_sigmask:1; | |
7e781418 | 640 | #endif |
626ebc41 | 641 | #ifdef CONFIG_MEMCG |
5eca1c10 | 642 | unsigned memcg_may_oom:1; |
127424c8 | 643 | #ifndef CONFIG_SLOB |
5eca1c10 | 644 | unsigned memcg_kmem_skip_account:1; |
6f185c29 | 645 | #endif |
127424c8 | 646 | #endif |
ff303e66 | 647 | #ifdef CONFIG_COMPAT_BRK |
5eca1c10 | 648 | unsigned brk_randomized:1; |
ff303e66 | 649 | #endif |
77f88796 TH |
650 | #ifdef CONFIG_CGROUPS |
651 | /* disallow userland-initiated cgroup migration */ | |
652 | unsigned no_cgroup_migration:1; | |
653 | #endif | |
6f185c29 | 654 | |
5eca1c10 | 655 | unsigned long atomic_flags; /* Flags requiring atomic access. */ |
1d4457f9 | 656 | |
5eca1c10 | 657 | struct restart_block restart_block; |
f56141e3 | 658 | |
5eca1c10 IM |
659 | pid_t pid; |
660 | pid_t tgid; | |
0a425405 | 661 | |
1314562a | 662 | #ifdef CONFIG_CC_STACKPROTECTOR |
5eca1c10 IM |
663 | /* Canary value for the -fstack-protector GCC feature: */ |
664 | unsigned long stack_canary; | |
1314562a | 665 | #endif |
4d1d61a6 | 666 | /* |
5eca1c10 | 667 | * Pointers to the (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 668 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 669 | * p->real_parent->pid) |
1da177e4 | 670 | */ |
5eca1c10 IM |
671 | |
672 | /* Real parent process: */ | |
673 | struct task_struct __rcu *real_parent; | |
674 | ||
675 | /* Recipient of SIGCHLD, wait4() reports: */ | |
676 | struct task_struct __rcu *parent; | |
677 | ||
1da177e4 | 678 | /* |
5eca1c10 | 679 | * Children/sibling form the list of natural children: |
1da177e4 | 680 | */ |
5eca1c10 IM |
681 | struct list_head children; |
682 | struct list_head sibling; | |
683 | struct task_struct *group_leader; | |
1da177e4 | 684 | |
f470021a | 685 | /* |
5eca1c10 IM |
686 | * 'ptraced' is the list of tasks this task is using ptrace() on. |
687 | * | |
f470021a | 688 | * This includes both natural children and PTRACE_ATTACH targets. |
5eca1c10 | 689 | * 'ptrace_entry' is this task's link on the p->parent->ptraced list. |
f470021a | 690 | */ |
5eca1c10 IM |
691 | struct list_head ptraced; |
692 | struct list_head ptrace_entry; | |
f470021a | 693 | |
1da177e4 | 694 | /* PID/PID hash table linkage. */ |
5eca1c10 IM |
695 | struct pid_link pids[PIDTYPE_MAX]; |
696 | struct list_head thread_group; | |
697 | struct list_head thread_node; | |
698 | ||
699 | struct completion *vfork_done; | |
1da177e4 | 700 | |
5eca1c10 IM |
701 | /* CLONE_CHILD_SETTID: */ |
702 | int __user *set_child_tid; | |
1da177e4 | 703 | |
5eca1c10 IM |
704 | /* CLONE_CHILD_CLEARTID: */ |
705 | int __user *clear_child_tid; | |
706 | ||
707 | u64 utime; | |
708 | u64 stime; | |
40565b5a | 709 | #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME |
5eca1c10 IM |
710 | u64 utimescaled; |
711 | u64 stimescaled; | |
40565b5a | 712 | #endif |
5eca1c10 IM |
713 | u64 gtime; |
714 | struct prev_cputime prev_cputime; | |
6a61671b | 715 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
bac5b6b6 | 716 | struct vtime vtime; |
d99ca3b9 | 717 | #endif |
d027d45d FW |
718 | |
719 | #ifdef CONFIG_NO_HZ_FULL | |
5eca1c10 | 720 | atomic_t tick_dep_mask; |
d027d45d | 721 | #endif |
5eca1c10 IM |
722 | /* Context switch counts: */ |
723 | unsigned long nvcsw; | |
724 | unsigned long nivcsw; | |
725 | ||
726 | /* Monotonic time in nsecs: */ | |
727 | u64 start_time; | |
728 | ||
729 | /* Boot based time in nsecs: */ | |
730 | u64 real_start_time; | |
731 | ||
732 | /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */ | |
733 | unsigned long min_flt; | |
734 | unsigned long maj_flt; | |
1da177e4 | 735 | |
b18b6a9c | 736 | #ifdef CONFIG_POSIX_TIMERS |
5eca1c10 IM |
737 | struct task_cputime cputime_expires; |
738 | struct list_head cpu_timers[3]; | |
b18b6a9c | 739 | #endif |
1da177e4 | 740 | |
5eca1c10 IM |
741 | /* Process credentials: */ |
742 | ||
743 | /* Tracer's credentials at attach: */ | |
744 | const struct cred __rcu *ptracer_cred; | |
745 | ||
746 | /* Objective and real subjective task credentials (COW): */ | |
747 | const struct cred __rcu *real_cred; | |
748 | ||
749 | /* Effective (overridable) subjective task credentials (COW): */ | |
750 | const struct cred __rcu *cred; | |
751 | ||
752 | /* | |
753 | * executable name, excluding path. | |
754 | * | |
755 | * - normally initialized setup_new_exec() | |
756 | * - access it with [gs]et_task_comm() | |
757 | * - lock it with task_lock() | |
758 | */ | |
759 | char comm[TASK_COMM_LEN]; | |
760 | ||
761 | struct nameidata *nameidata; | |
762 | ||
3d5b6fcc | 763 | #ifdef CONFIG_SYSVIPC |
5eca1c10 IM |
764 | struct sysv_sem sysvsem; |
765 | struct sysv_shm sysvshm; | |
3d5b6fcc | 766 | #endif |
e162b39a | 767 | #ifdef CONFIG_DETECT_HUNG_TASK |
5eca1c10 | 768 | unsigned long last_switch_count; |
82a1fcb9 | 769 | #endif |
5eca1c10 IM |
770 | /* Filesystem information: */ |
771 | struct fs_struct *fs; | |
772 | ||
773 | /* Open file information: */ | |
774 | struct files_struct *files; | |
775 | ||
776 | /* Namespaces: */ | |
777 | struct nsproxy *nsproxy; | |
778 | ||
779 | /* Signal handlers: */ | |
780 | struct signal_struct *signal; | |
781 | struct sighand_struct *sighand; | |
782 | sigset_t blocked; | |
783 | sigset_t real_blocked; | |
784 | /* Restored if set_restore_sigmask() was used: */ | |
785 | sigset_t saved_sigmask; | |
786 | struct sigpending pending; | |
787 | unsigned long sas_ss_sp; | |
788 | size_t sas_ss_size; | |
789 | unsigned int sas_ss_flags; | |
790 | ||
791 | struct callback_head *task_works; | |
792 | ||
793 | struct audit_context *audit_context; | |
bfef93a5 | 794 | #ifdef CONFIG_AUDITSYSCALL |
5eca1c10 IM |
795 | kuid_t loginuid; |
796 | unsigned int sessionid; | |
bfef93a5 | 797 | #endif |
5eca1c10 IM |
798 | struct seccomp seccomp; |
799 | ||
800 | /* Thread group tracking: */ | |
801 | u32 parent_exec_id; | |
802 | u32 self_exec_id; | |
1da177e4 | 803 | |
5eca1c10 IM |
804 | /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */ |
805 | spinlock_t alloc_lock; | |
1da177e4 | 806 | |
b29739f9 | 807 | /* Protection of the PI data structures: */ |
5eca1c10 | 808 | raw_spinlock_t pi_lock; |
b29739f9 | 809 | |
5eca1c10 | 810 | struct wake_q_node wake_q; |
76751049 | 811 | |
23f78d4a | 812 | #ifdef CONFIG_RT_MUTEXES |
5eca1c10 IM |
813 | /* PI waiters blocked on a rt_mutex held by this task: */ |
814 | struct rb_root pi_waiters; | |
815 | struct rb_node *pi_waiters_leftmost; | |
e96a7705 XP |
816 | /* Updated under owner's pi_lock and rq lock */ |
817 | struct task_struct *pi_top_task; | |
5eca1c10 IM |
818 | /* Deadlock detection and priority inheritance handling: */ |
819 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
820 | #endif |
821 | ||
408894ee | 822 | #ifdef CONFIG_DEBUG_MUTEXES |
5eca1c10 IM |
823 | /* Mutex deadlock detection: */ |
824 | struct mutex_waiter *blocked_on; | |
408894ee | 825 | #endif |
5eca1c10 | 826 | |
de30a2b3 | 827 | #ifdef CONFIG_TRACE_IRQFLAGS |
5eca1c10 IM |
828 | unsigned int irq_events; |
829 | unsigned long hardirq_enable_ip; | |
830 | unsigned long hardirq_disable_ip; | |
831 | unsigned int hardirq_enable_event; | |
832 | unsigned int hardirq_disable_event; | |
833 | int hardirqs_enabled; | |
834 | int hardirq_context; | |
835 | unsigned long softirq_disable_ip; | |
836 | unsigned long softirq_enable_ip; | |
837 | unsigned int softirq_disable_event; | |
838 | unsigned int softirq_enable_event; | |
839 | int softirqs_enabled; | |
840 | int softirq_context; | |
de30a2b3 | 841 | #endif |
5eca1c10 | 842 | |
fbb9ce95 | 843 | #ifdef CONFIG_LOCKDEP |
5eca1c10 IM |
844 | # define MAX_LOCK_DEPTH 48UL |
845 | u64 curr_chain_key; | |
846 | int lockdep_depth; | |
847 | unsigned int lockdep_recursion; | |
848 | struct held_lock held_locks[MAX_LOCK_DEPTH]; | |
849 | gfp_t lockdep_reclaim_gfp; | |
fbb9ce95 | 850 | #endif |
5eca1c10 | 851 | |
c6d30853 | 852 | #ifdef CONFIG_UBSAN |
5eca1c10 | 853 | unsigned int in_ubsan; |
c6d30853 | 854 | #endif |
408894ee | 855 | |
5eca1c10 IM |
856 | /* Journalling filesystem info: */ |
857 | void *journal_info; | |
1da177e4 | 858 | |
5eca1c10 IM |
859 | /* Stacked block device info: */ |
860 | struct bio_list *bio_list; | |
d89d8796 | 861 | |
73c10101 | 862 | #ifdef CONFIG_BLOCK |
5eca1c10 IM |
863 | /* Stack plugging: */ |
864 | struct blk_plug *plug; | |
73c10101 JA |
865 | #endif |
866 | ||
5eca1c10 IM |
867 | /* VM state: */ |
868 | struct reclaim_state *reclaim_state; | |
869 | ||
870 | struct backing_dev_info *backing_dev_info; | |
1da177e4 | 871 | |
5eca1c10 | 872 | struct io_context *io_context; |
1da177e4 | 873 | |
5eca1c10 IM |
874 | /* Ptrace state: */ |
875 | unsigned long ptrace_message; | |
876 | siginfo_t *last_siginfo; | |
1da177e4 | 877 | |
5eca1c10 IM |
878 | struct task_io_accounting ioac; |
879 | #ifdef CONFIG_TASK_XACCT | |
880 | /* Accumulated RSS usage: */ | |
881 | u64 acct_rss_mem1; | |
882 | /* Accumulated virtual memory usage: */ | |
883 | u64 acct_vm_mem1; | |
884 | /* stime + utime since last update: */ | |
885 | u64 acct_timexpd; | |
1da177e4 LT |
886 | #endif |
887 | #ifdef CONFIG_CPUSETS | |
5eca1c10 IM |
888 | /* Protected by ->alloc_lock: */ |
889 | nodemask_t mems_allowed; | |
890 | /* Seqence number to catch updates: */ | |
891 | seqcount_t mems_allowed_seq; | |
892 | int cpuset_mem_spread_rotor; | |
893 | int cpuset_slab_spread_rotor; | |
1da177e4 | 894 | #endif |
ddbcc7e8 | 895 | #ifdef CONFIG_CGROUPS |
5eca1c10 IM |
896 | /* Control Group info protected by css_set_lock: */ |
897 | struct css_set __rcu *cgroups; | |
898 | /* cg_list protected by css_set_lock and tsk->alloc_lock: */ | |
899 | struct list_head cg_list; | |
ddbcc7e8 | 900 | #endif |
8c2bc51f | 901 | #ifdef CONFIG_INTEL_RDT |
703c3837 | 902 | u32 closid; |
5ba6b745 | 903 | u32 rmid; |
e02737d5 | 904 | #endif |
42b2dd0a | 905 | #ifdef CONFIG_FUTEX |
5eca1c10 | 906 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
907 | #ifdef CONFIG_COMPAT |
908 | struct compat_robust_list_head __user *compat_robust_list; | |
909 | #endif | |
5eca1c10 IM |
910 | struct list_head pi_state_list; |
911 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 912 | #endif |
cdd6c482 | 913 | #ifdef CONFIG_PERF_EVENTS |
5eca1c10 IM |
914 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
915 | struct mutex perf_event_mutex; | |
916 | struct list_head perf_event_list; | |
a63eaf34 | 917 | #endif |
8f47b187 | 918 | #ifdef CONFIG_DEBUG_PREEMPT |
5eca1c10 | 919 | unsigned long preempt_disable_ip; |
8f47b187 | 920 | #endif |
c7aceaba | 921 | #ifdef CONFIG_NUMA |
5eca1c10 IM |
922 | /* Protected by alloc_lock: */ |
923 | struct mempolicy *mempolicy; | |
45816682 | 924 | short il_prev; |
5eca1c10 | 925 | short pref_node_fork; |
42b2dd0a | 926 | #endif |
cbee9f88 | 927 | #ifdef CONFIG_NUMA_BALANCING |
5eca1c10 IM |
928 | int numa_scan_seq; |
929 | unsigned int numa_scan_period; | |
930 | unsigned int numa_scan_period_max; | |
931 | int numa_preferred_nid; | |
932 | unsigned long numa_migrate_retry; | |
933 | /* Migration stamp: */ | |
934 | u64 node_stamp; | |
935 | u64 last_task_numa_placement; | |
936 | u64 last_sum_exec_runtime; | |
937 | struct callback_head numa_work; | |
938 | ||
939 | struct list_head numa_entry; | |
940 | struct numa_group *numa_group; | |
8c8a743c | 941 | |
745d6147 | 942 | /* |
44dba3d5 IM |
943 | * numa_faults is an array split into four regions: |
944 | * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer | |
945 | * in this precise order. | |
946 | * | |
947 | * faults_memory: Exponential decaying average of faults on a per-node | |
948 | * basis. Scheduling placement decisions are made based on these | |
949 | * counts. The values remain static for the duration of a PTE scan. | |
950 | * faults_cpu: Track the nodes the process was running on when a NUMA | |
951 | * hinting fault was incurred. | |
952 | * faults_memory_buffer and faults_cpu_buffer: Record faults per node | |
953 | * during the current scan window. When the scan completes, the counts | |
954 | * in faults_memory and faults_cpu decay and these values are copied. | |
745d6147 | 955 | */ |
5eca1c10 IM |
956 | unsigned long *numa_faults; |
957 | unsigned long total_numa_faults; | |
745d6147 | 958 | |
04bb2f94 RR |
959 | /* |
960 | * numa_faults_locality tracks if faults recorded during the last | |
074c2381 MG |
961 | * scan window were remote/local or failed to migrate. The task scan |
962 | * period is adapted based on the locality of the faults with different | |
963 | * weights depending on whether they were shared or private faults | |
04bb2f94 | 964 | */ |
5eca1c10 | 965 | unsigned long numa_faults_locality[3]; |
04bb2f94 | 966 | |
5eca1c10 | 967 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
968 | #endif /* CONFIG_NUMA_BALANCING */ |
969 | ||
5eca1c10 | 970 | struct tlbflush_unmap_batch tlb_ubc; |
72b252ae | 971 | |
5eca1c10 | 972 | struct rcu_head rcu; |
b92ce558 | 973 | |
5eca1c10 IM |
974 | /* Cache last used pipe for splice(): */ |
975 | struct pipe_inode_info *splice_pipe; | |
5640f768 | 976 | |
5eca1c10 | 977 | struct page_frag task_frag; |
5640f768 | 978 | |
47913d4e IM |
979 | #ifdef CONFIG_TASK_DELAY_ACCT |
980 | struct task_delay_info *delays; | |
f4f154fd | 981 | #endif |
47913d4e | 982 | |
f4f154fd | 983 | #ifdef CONFIG_FAULT_INJECTION |
5eca1c10 | 984 | int make_it_fail; |
9049f2f6 | 985 | unsigned int fail_nth; |
ca74e92b | 986 | #endif |
9d823e8f | 987 | /* |
5eca1c10 IM |
988 | * When (nr_dirtied >= nr_dirtied_pause), it's time to call |
989 | * balance_dirty_pages() for a dirty throttling pause: | |
9d823e8f | 990 | */ |
5eca1c10 IM |
991 | int nr_dirtied; |
992 | int nr_dirtied_pause; | |
993 | /* Start of a write-and-pause period: */ | |
994 | unsigned long dirty_paused_when; | |
9d823e8f | 995 | |
9745512c | 996 | #ifdef CONFIG_LATENCYTOP |
5eca1c10 IM |
997 | int latency_record_count; |
998 | struct latency_record latency_record[LT_SAVECOUNT]; | |
9745512c | 999 | #endif |
6976675d | 1000 | /* |
5eca1c10 | 1001 | * Time slack values; these are used to round up poll() and |
6976675d AV |
1002 | * select() etc timeout values. These are in nanoseconds. |
1003 | */ | |
5eca1c10 IM |
1004 | u64 timer_slack_ns; |
1005 | u64 default_timer_slack_ns; | |
f8d570a4 | 1006 | |
0b24becc | 1007 | #ifdef CONFIG_KASAN |
5eca1c10 | 1008 | unsigned int kasan_depth; |
0b24becc | 1009 | #endif |
5eca1c10 | 1010 | |
fb52607a | 1011 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
5eca1c10 IM |
1012 | /* Index of current stored address in ret_stack: */ |
1013 | int curr_ret_stack; | |
1014 | ||
1015 | /* Stack of return addresses for return function tracing: */ | |
1016 | struct ftrace_ret_stack *ret_stack; | |
1017 | ||
1018 | /* Timestamp for last schedule: */ | |
1019 | unsigned long long ftrace_timestamp; | |
1020 | ||
f201ae23 FW |
1021 | /* |
1022 | * Number of functions that haven't been traced | |
5eca1c10 | 1023 | * because of depth overrun: |
f201ae23 | 1024 | */ |
5eca1c10 IM |
1025 | atomic_t trace_overrun; |
1026 | ||
1027 | /* Pause tracing: */ | |
1028 | atomic_t tracing_graph_pause; | |
f201ae23 | 1029 | #endif |
5eca1c10 | 1030 | |
ea4e2bc4 | 1031 | #ifdef CONFIG_TRACING |
5eca1c10 IM |
1032 | /* State flags for use by tracers: */ |
1033 | unsigned long trace; | |
1034 | ||
1035 | /* Bitmask and counter of trace recursion: */ | |
1036 | unsigned long trace_recursion; | |
261842b7 | 1037 | #endif /* CONFIG_TRACING */ |
5eca1c10 | 1038 | |
5c9a8750 | 1039 | #ifdef CONFIG_KCOV |
5eca1c10 IM |
1040 | /* Coverage collection mode enabled for this task (0 if disabled): */ |
1041 | enum kcov_mode kcov_mode; | |
1042 | ||
1043 | /* Size of the kcov_area: */ | |
1044 | unsigned int kcov_size; | |
1045 | ||
1046 | /* Buffer for coverage collection: */ | |
1047 | void *kcov_area; | |
1048 | ||
1049 | /* KCOV descriptor wired with this task or NULL: */ | |
1050 | struct kcov *kcov; | |
5c9a8750 | 1051 | #endif |
5eca1c10 | 1052 | |
6f185c29 | 1053 | #ifdef CONFIG_MEMCG |
5eca1c10 IM |
1054 | struct mem_cgroup *memcg_in_oom; |
1055 | gfp_t memcg_oom_gfp_mask; | |
1056 | int memcg_oom_order; | |
b23afb93 | 1057 | |
5eca1c10 IM |
1058 | /* Number of pages to reclaim on returning to userland: */ |
1059 | unsigned int memcg_nr_pages_over_high; | |
569b846d | 1060 | #endif |
5eca1c10 | 1061 | |
0326f5a9 | 1062 | #ifdef CONFIG_UPROBES |
5eca1c10 | 1063 | struct uprobe_task *utask; |
0326f5a9 | 1064 | #endif |
cafe5635 | 1065 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
5eca1c10 IM |
1066 | unsigned int sequential_io; |
1067 | unsigned int sequential_io_avg; | |
cafe5635 | 1068 | #endif |
8eb23b9f | 1069 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
5eca1c10 | 1070 | unsigned long task_state_change; |
8eb23b9f | 1071 | #endif |
5eca1c10 | 1072 | int pagefault_disabled; |
03049269 | 1073 | #ifdef CONFIG_MMU |
5eca1c10 | 1074 | struct task_struct *oom_reaper_list; |
03049269 | 1075 | #endif |
ba14a194 | 1076 | #ifdef CONFIG_VMAP_STACK |
5eca1c10 | 1077 | struct vm_struct *stack_vm_area; |
ba14a194 | 1078 | #endif |
68f24b08 | 1079 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
5eca1c10 IM |
1080 | /* A live task holds one reference: */ |
1081 | atomic_t stack_refcount; | |
d83a7cb3 JP |
1082 | #endif |
1083 | #ifdef CONFIG_LIVEPATCH | |
1084 | int patch_state; | |
0302e28d | 1085 | #endif |
e4e55b47 TH |
1086 | #ifdef CONFIG_SECURITY |
1087 | /* Used by LSM modules for access restriction: */ | |
1088 | void *security; | |
68f24b08 | 1089 | #endif |
29e48ce8 KC |
1090 | |
1091 | /* | |
1092 | * New fields for task_struct should be added above here, so that | |
1093 | * they are included in the randomized portion of task_struct. | |
1094 | */ | |
1095 | randomized_struct_fields_end | |
1096 | ||
5eca1c10 IM |
1097 | /* CPU-specific state of this task: */ |
1098 | struct thread_struct thread; | |
1099 | ||
1100 | /* | |
1101 | * WARNING: on x86, 'thread_struct' contains a variable-sized | |
1102 | * structure. It *MUST* be at the end of 'task_struct'. | |
1103 | * | |
1104 | * Do not put anything below here! | |
1105 | */ | |
1da177e4 LT |
1106 | }; |
1107 | ||
e868171a | 1108 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1109 | { |
1110 | return task->pids[PIDTYPE_PID].pid; | |
1111 | } | |
1112 | ||
e868171a | 1113 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1114 | { |
1115 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1116 | } | |
1117 | ||
6dda81f4 | 1118 | /* |
5eca1c10 | 1119 | * Without tasklist or RCU lock it is not safe to dereference |
6dda81f4 ON |
1120 | * the result of task_pgrp/task_session even if task == current, |
1121 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1122 | */ | |
e868171a | 1123 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1124 | { |
1125 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1126 | } | |
1127 | ||
e868171a | 1128 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1129 | { |
1130 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1131 | } | |
1132 | ||
7af57294 PE |
1133 | /* |
1134 | * the helpers to get the task's different pids as they are seen | |
1135 | * from various namespaces | |
1136 | * | |
1137 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1138 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1139 | * current. | |
7af57294 PE |
1140 | * task_xid_nr_ns() : id seen from the ns specified; |
1141 | * | |
7af57294 PE |
1142 | * see also pid_nr() etc in include/linux/pid.h |
1143 | */ | |
5eca1c10 | 1144 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns); |
7af57294 | 1145 | |
e868171a | 1146 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1147 | { |
1148 | return tsk->pid; | |
1149 | } | |
1150 | ||
5eca1c10 | 1151 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
52ee2dfd ON |
1152 | { |
1153 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1154 | } | |
7af57294 PE |
1155 | |
1156 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1157 | { | |
52ee2dfd | 1158 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1159 | } |
1160 | ||
1161 | ||
e868171a | 1162 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1163 | { |
1164 | return tsk->tgid; | |
1165 | } | |
1166 | ||
5eca1c10 IM |
1167 | /** |
1168 | * pid_alive - check that a task structure is not stale | |
1169 | * @p: Task structure to be checked. | |
1170 | * | |
1171 | * Test if a process is not yet dead (at most zombie state) | |
1172 | * If pid_alive fails, then pointers within the task structure | |
1173 | * can be stale and must not be dereferenced. | |
1174 | * | |
1175 | * Return: 1 if the process is alive. 0 otherwise. | |
1176 | */ | |
1177 | static inline int pid_alive(const struct task_struct *p) | |
1178 | { | |
1179 | return p->pids[PIDTYPE_PID].pid != NULL; | |
1180 | } | |
7af57294 | 1181 | |
5eca1c10 | 1182 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
7af57294 | 1183 | { |
52ee2dfd | 1184 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1185 | } |
1186 | ||
7af57294 PE |
1187 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1188 | { | |
52ee2dfd | 1189 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1190 | } |
1191 | ||
1192 | ||
5eca1c10 | 1193 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
7af57294 | 1194 | { |
52ee2dfd | 1195 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1196 | } |
1197 | ||
7af57294 PE |
1198 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1199 | { | |
52ee2dfd | 1200 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1201 | } |
1202 | ||
dd1c1f2f ON |
1203 | static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
1204 | { | |
1205 | return __task_pid_nr_ns(tsk, __PIDTYPE_TGID, ns); | |
1206 | } | |
1207 | ||
1208 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1209 | { | |
1210 | return __task_pid_nr_ns(tsk, __PIDTYPE_TGID, NULL); | |
1211 | } | |
1212 | ||
1213 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) | |
1214 | { | |
1215 | pid_t pid = 0; | |
1216 | ||
1217 | rcu_read_lock(); | |
1218 | if (pid_alive(tsk)) | |
1219 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1220 | rcu_read_unlock(); | |
1221 | ||
1222 | return pid; | |
1223 | } | |
1224 | ||
1225 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1226 | { | |
1227 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1228 | } | |
1229 | ||
5eca1c10 | 1230 | /* Obsolete, do not use: */ |
1b0f7ffd ON |
1231 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) |
1232 | { | |
1233 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1234 | } | |
7af57294 | 1235 | |
f400e198 | 1236 | /** |
570f5241 SS |
1237 | * is_global_init - check if a task structure is init. Since init |
1238 | * is free to have sub-threads we need to check tgid. | |
3260259f HK |
1239 | * @tsk: Task structure to be checked. |
1240 | * | |
1241 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1242 | * |
1243 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1244 | */ |
e868171a | 1245 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 | 1246 | { |
570f5241 | 1247 | return task_tgid_nr(tsk) == 1; |
b461cc03 | 1248 | } |
b460cbc5 | 1249 | |
9ec52099 CLG |
1250 | extern struct pid *cad_pid; |
1251 | ||
1da177e4 LT |
1252 | /* |
1253 | * Per process flags | |
1254 | */ | |
5eca1c10 IM |
1255 | #define PF_IDLE 0x00000002 /* I am an IDLE thread */ |
1256 | #define PF_EXITING 0x00000004 /* Getting shut down */ | |
1257 | #define PF_EXITPIDONE 0x00000008 /* PI exit done on shut down */ | |
1258 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ | |
1259 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ | |
1260 | #define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */ | |
1261 | #define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */ | |
1262 | #define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */ | |
1263 | #define PF_DUMPCORE 0x00000200 /* Dumped core */ | |
1264 | #define PF_SIGNALED 0x00000400 /* Killed by a signal */ | |
1265 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1266 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */ | |
1267 | #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */ | |
1268 | #define PF_USED_ASYNC 0x00004000 /* Used async_schedule*(), used by module init */ | |
1269 | #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */ | |
1270 | #define PF_FROZEN 0x00010000 /* Frozen for system suspend */ | |
7dea19f9 MH |
1271 | #define PF_KSWAPD 0x00020000 /* I am kswapd */ |
1272 | #define PF_MEMALLOC_NOFS 0x00040000 /* All allocation requests will inherit GFP_NOFS */ | |
1273 | #define PF_MEMALLOC_NOIO 0x00080000 /* All allocation requests will inherit GFP_NOIO */ | |
5eca1c10 IM |
1274 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
1275 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ | |
1276 | #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */ | |
1277 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1278 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ | |
1279 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ | |
1280 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ | |
1281 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ | |
1282 | #define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */ | |
1da177e4 LT |
1283 | |
1284 | /* | |
1285 | * Only the _current_ task can read/write to tsk->flags, but other | |
1286 | * tasks can access tsk->flags in readonly mode for example | |
1287 | * with tsk_used_math (like during threaded core dumping). | |
1288 | * There is however an exception to this rule during ptrace | |
1289 | * or during fork: the ptracer task is allowed to write to the | |
1290 | * child->flags of its traced child (same goes for fork, the parent | |
1291 | * can write to the child->flags), because we're guaranteed the | |
1292 | * child is not running and in turn not changing child->flags | |
1293 | * at the same time the parent does it. | |
1294 | */ | |
5eca1c10 IM |
1295 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) |
1296 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1297 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1298 | #define set_used_math() set_stopped_child_used_math(current) | |
1299 | ||
1da177e4 LT |
1300 | #define conditional_stopped_child_used_math(condition, child) \ |
1301 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
5eca1c10 IM |
1302 | |
1303 | #define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current) | |
1304 | ||
1da177e4 LT |
1305 | #define copy_to_stopped_child_used_math(child) \ |
1306 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
5eca1c10 | 1307 | |
1da177e4 | 1308 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ |
5eca1c10 IM |
1309 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) |
1310 | #define used_math() tsk_used_math(current) | |
1da177e4 | 1311 | |
62ec05dd TG |
1312 | static inline bool is_percpu_thread(void) |
1313 | { | |
1314 | #ifdef CONFIG_SMP | |
1315 | return (current->flags & PF_NO_SETAFFINITY) && | |
1316 | (current->nr_cpus_allowed == 1); | |
1317 | #else | |
1318 | return true; | |
1319 | #endif | |
1320 | } | |
1321 | ||
1d4457f9 | 1322 | /* Per-process atomic flags. */ |
5eca1c10 IM |
1323 | #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ |
1324 | #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ | |
1325 | #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ | |
2ad654bc | 1326 | |
1d4457f9 | 1327 | |
e0e5070b ZL |
1328 | #define TASK_PFA_TEST(name, func) \ |
1329 | static inline bool task_##func(struct task_struct *p) \ | |
1330 | { return test_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1331 | |
e0e5070b ZL |
1332 | #define TASK_PFA_SET(name, func) \ |
1333 | static inline void task_set_##func(struct task_struct *p) \ | |
1334 | { set_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1335 | |
e0e5070b ZL |
1336 | #define TASK_PFA_CLEAR(name, func) \ |
1337 | static inline void task_clear_##func(struct task_struct *p) \ | |
1338 | { clear_bit(PFA_##name, &p->atomic_flags); } | |
1339 | ||
1340 | TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) | |
1341 | TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) | |
1d4457f9 | 1342 | |
2ad654bc ZL |
1343 | TASK_PFA_TEST(SPREAD_PAGE, spread_page) |
1344 | TASK_PFA_SET(SPREAD_PAGE, spread_page) | |
1345 | TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) | |
1346 | ||
1347 | TASK_PFA_TEST(SPREAD_SLAB, spread_slab) | |
1348 | TASK_PFA_SET(SPREAD_SLAB, spread_slab) | |
1349 | TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) | |
1d4457f9 | 1350 | |
5eca1c10 | 1351 | static inline void |
717a94b5 | 1352 | current_restore_flags(unsigned long orig_flags, unsigned long flags) |
907aed48 | 1353 | { |
717a94b5 N |
1354 | current->flags &= ~flags; |
1355 | current->flags |= orig_flags & flags; | |
907aed48 MG |
1356 | } |
1357 | ||
5eca1c10 IM |
1358 | extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial); |
1359 | extern int task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed); | |
1da177e4 | 1360 | #ifdef CONFIG_SMP |
5eca1c10 IM |
1361 | extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask); |
1362 | extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask); | |
1da177e4 | 1363 | #else |
5eca1c10 | 1364 | static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) |
1e1b6c51 KM |
1365 | { |
1366 | } | |
5eca1c10 | 1367 | static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask) |
1da177e4 | 1368 | { |
96f874e2 | 1369 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1370 | return -EINVAL; |
1371 | return 0; | |
1372 | } | |
1373 | #endif | |
e0ad9556 | 1374 | |
6d0d2878 CB |
1375 | #ifndef cpu_relax_yield |
1376 | #define cpu_relax_yield() cpu_relax() | |
1377 | #endif | |
1378 | ||
fa93384f | 1379 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
1380 | extern void set_user_nice(struct task_struct *p, long nice); |
1381 | extern int task_prio(const struct task_struct *p); | |
5eca1c10 | 1382 | |
d0ea0268 DY |
1383 | /** |
1384 | * task_nice - return the nice value of a given task. | |
1385 | * @p: the task in question. | |
1386 | * | |
1387 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
1388 | */ | |
1389 | static inline int task_nice(const struct task_struct *p) | |
1390 | { | |
1391 | return PRIO_TO_NICE((p)->static_prio); | |
1392 | } | |
5eca1c10 | 1393 | |
36c8b586 IM |
1394 | extern int can_nice(const struct task_struct *p, const int nice); |
1395 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 1396 | extern int idle_cpu(int cpu); |
5eca1c10 IM |
1397 | extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *); |
1398 | extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *); | |
1399 | extern int sched_setattr(struct task_struct *, const struct sched_attr *); | |
36c8b586 | 1400 | extern struct task_struct *idle_task(int cpu); |
5eca1c10 | 1401 | |
c4f30608 PM |
1402 | /** |
1403 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 1404 | * @p: the task in question. |
e69f6186 YB |
1405 | * |
1406 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 1407 | */ |
7061ca3b | 1408 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 | 1409 | { |
c1de45ca | 1410 | return !!(p->flags & PF_IDLE); |
c4f30608 | 1411 | } |
5eca1c10 | 1412 | |
36c8b586 | 1413 | extern struct task_struct *curr_task(int cpu); |
a458ae2e | 1414 | extern void ia64_set_curr_task(int cpu, struct task_struct *p); |
1da177e4 LT |
1415 | |
1416 | void yield(void); | |
1417 | ||
1da177e4 | 1418 | union thread_union { |
c65eacbe | 1419 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1da177e4 | 1420 | struct thread_info thread_info; |
c65eacbe | 1421 | #endif |
1da177e4 LT |
1422 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
1423 | }; | |
1424 | ||
f3ac6067 IM |
1425 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
1426 | static inline struct thread_info *task_thread_info(struct task_struct *task) | |
1427 | { | |
1428 | return &task->thread_info; | |
1429 | } | |
1430 | #elif !defined(__HAVE_THREAD_FUNCTIONS) | |
1431 | # define task_thread_info(task) ((struct thread_info *)(task)->stack) | |
1432 | #endif | |
1433 | ||
198fe21b PE |
1434 | /* |
1435 | * find a task by one of its numerical ids | |
1436 | * | |
198fe21b PE |
1437 | * find_task_by_pid_ns(): |
1438 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1439 | * find_task_by_vpid(): |
1440 | * finds a task by its virtual pid | |
198fe21b | 1441 | * |
e49859e7 | 1442 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
1443 | */ |
1444 | ||
228ebcbe | 1445 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
5eca1c10 | 1446 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns); |
198fe21b | 1447 | |
b3c97528 HH |
1448 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
1449 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 1450 | extern void wake_up_new_task(struct task_struct *tsk); |
5eca1c10 | 1451 | |
1da177e4 | 1452 | #ifdef CONFIG_SMP |
5eca1c10 | 1453 | extern void kick_process(struct task_struct *tsk); |
1da177e4 | 1454 | #else |
5eca1c10 | 1455 | static inline void kick_process(struct task_struct *tsk) { } |
1da177e4 | 1456 | #endif |
1da177e4 | 1457 | |
82b89778 | 1458 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
5eca1c10 | 1459 | |
82b89778 AH |
1460 | static inline void set_task_comm(struct task_struct *tsk, const char *from) |
1461 | { | |
1462 | __set_task_comm(tsk, from, false); | |
1463 | } | |
5eca1c10 | 1464 | |
59714d65 | 1465 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
1466 | |
1467 | #ifdef CONFIG_SMP | |
317f3941 | 1468 | void scheduler_ipi(void); |
85ba2d86 | 1469 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 1470 | #else |
184748cc | 1471 | static inline void scheduler_ipi(void) { } |
5eca1c10 | 1472 | static inline unsigned long wait_task_inactive(struct task_struct *p, long match_state) |
85ba2d86 RM |
1473 | { |
1474 | return 1; | |
1475 | } | |
1da177e4 LT |
1476 | #endif |
1477 | ||
5eca1c10 IM |
1478 | /* |
1479 | * Set thread flags in other task's structures. | |
1480 | * See asm/thread_info.h for TIF_xxxx flags available: | |
1da177e4 LT |
1481 | */ |
1482 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1483 | { | |
a1261f54 | 1484 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1485 | } |
1486 | ||
1487 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1488 | { | |
a1261f54 | 1489 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1490 | } |
1491 | ||
1492 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1493 | { | |
a1261f54 | 1494 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1495 | } |
1496 | ||
1497 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1498 | { | |
a1261f54 | 1499 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1500 | } |
1501 | ||
1502 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1503 | { | |
a1261f54 | 1504 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1505 | } |
1506 | ||
1507 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
1508 | { | |
1509 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1510 | } | |
1511 | ||
1512 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
1513 | { | |
1514 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1515 | } | |
1516 | ||
8ae121ac GH |
1517 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
1518 | { | |
1519 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
1520 | } | |
1521 | ||
1da177e4 LT |
1522 | /* |
1523 | * cond_resched() and cond_resched_lock(): latency reduction via | |
1524 | * explicit rescheduling in places that are safe. The return | |
1525 | * value indicates whether a reschedule was done in fact. | |
1526 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1527 | * cond_resched_softirq() will enable bhs before scheduling. | |
1528 | */ | |
35a773a0 | 1529 | #ifndef CONFIG_PREEMPT |
c3921ab7 | 1530 | extern int _cond_resched(void); |
35a773a0 PZ |
1531 | #else |
1532 | static inline int _cond_resched(void) { return 0; } | |
1533 | #endif | |
6f80bd98 | 1534 | |
613afbf8 | 1535 | #define cond_resched() ({ \ |
3427445a | 1536 | ___might_sleep(__FILE__, __LINE__, 0); \ |
613afbf8 FW |
1537 | _cond_resched(); \ |
1538 | }) | |
6f80bd98 | 1539 | |
613afbf8 FW |
1540 | extern int __cond_resched_lock(spinlock_t *lock); |
1541 | ||
1542 | #define cond_resched_lock(lock) ({ \ | |
3427445a | 1543 | ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\ |
613afbf8 FW |
1544 | __cond_resched_lock(lock); \ |
1545 | }) | |
1546 | ||
1547 | extern int __cond_resched_softirq(void); | |
1548 | ||
75e1056f | 1549 | #define cond_resched_softirq() ({ \ |
3427445a | 1550 | ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ |
75e1056f | 1551 | __cond_resched_softirq(); \ |
613afbf8 | 1552 | }) |
1da177e4 | 1553 | |
f6f3c437 SH |
1554 | static inline void cond_resched_rcu(void) |
1555 | { | |
1556 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
1557 | rcu_read_unlock(); | |
1558 | cond_resched(); | |
1559 | rcu_read_lock(); | |
1560 | #endif | |
1561 | } | |
1562 | ||
1da177e4 LT |
1563 | /* |
1564 | * Does a critical section need to be broken due to another | |
95c354fe NP |
1565 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
1566 | * but a general need for low latency) | |
1da177e4 | 1567 | */ |
95c354fe | 1568 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 1569 | { |
95c354fe NP |
1570 | #ifdef CONFIG_PREEMPT |
1571 | return spin_is_contended(lock); | |
1572 | #else | |
1da177e4 | 1573 | return 0; |
95c354fe | 1574 | #endif |
1da177e4 LT |
1575 | } |
1576 | ||
75f93fed PZ |
1577 | static __always_inline bool need_resched(void) |
1578 | { | |
1579 | return unlikely(tif_need_resched()); | |
1580 | } | |
1581 | ||
1da177e4 LT |
1582 | /* |
1583 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
1584 | */ | |
1585 | #ifdef CONFIG_SMP | |
1586 | ||
1587 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1588 | { | |
c65eacbe AL |
1589 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
1590 | return p->cpu; | |
1591 | #else | |
a1261f54 | 1592 | return task_thread_info(p)->cpu; |
c65eacbe | 1593 | #endif |
1da177e4 LT |
1594 | } |
1595 | ||
c65cc870 | 1596 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
1597 | |
1598 | #else | |
1599 | ||
1600 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1601 | { | |
1602 | return 0; | |
1603 | } | |
1604 | ||
1605 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
1606 | { | |
1607 | } | |
1608 | ||
1609 | #endif /* CONFIG_SMP */ | |
1610 | ||
d9345c65 PX |
1611 | /* |
1612 | * In order to reduce various lock holder preemption latencies provide an | |
1613 | * interface to see if a vCPU is currently running or not. | |
1614 | * | |
1615 | * This allows us to terminate optimistic spin loops and block, analogous to | |
1616 | * the native optimistic spin heuristic of testing if the lock owner task is | |
1617 | * running or not. | |
1618 | */ | |
1619 | #ifndef vcpu_is_preempted | |
1620 | # define vcpu_is_preempted(cpu) false | |
1621 | #endif | |
1622 | ||
96f874e2 RR |
1623 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
1624 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 1625 | |
82455257 DH |
1626 | #ifndef TASK_SIZE_OF |
1627 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
1628 | #endif | |
1629 | ||
1da177e4 | 1630 | #endif |