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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_SCHED_H |
3 | #define _LINUX_SCHED_H | |
4 | ||
5eca1c10 IM |
5 | /* |
6 | * Define 'struct task_struct' and provide the main scheduler | |
7 | * APIs (schedule(), wakeup variants, etc.) | |
8 | */ | |
b7b3c76a | 9 | |
5eca1c10 | 10 | #include <uapi/linux/sched.h> |
5c228079 | 11 | |
5eca1c10 | 12 | #include <asm/current.h> |
1da177e4 | 13 | |
5eca1c10 | 14 | #include <linux/pid.h> |
1da177e4 | 15 | #include <linux/sem.h> |
ab602f79 | 16 | #include <linux/shm.h> |
5eca1c10 IM |
17 | #include <linux/mutex.h> |
18 | #include <linux/plist.h> | |
19 | #include <linux/hrtimer.h> | |
0584df9c | 20 | #include <linux/irqflags.h> |
1da177e4 | 21 | #include <linux/seccomp.h> |
5eca1c10 | 22 | #include <linux/nodemask.h> |
b68070e1 | 23 | #include <linux/rcupdate.h> |
ec1d2819 | 24 | #include <linux/refcount.h> |
a3b6714e | 25 | #include <linux/resource.h> |
9745512c | 26 | #include <linux/latencytop.h> |
5eca1c10 | 27 | #include <linux/sched/prio.h> |
9eacb5c7 | 28 | #include <linux/sched/types.h> |
5eca1c10 | 29 | #include <linux/signal_types.h> |
1446e1df | 30 | #include <linux/syscall_user_dispatch.h> |
5eca1c10 IM |
31 | #include <linux/mm_types_task.h> |
32 | #include <linux/task_io_accounting.h> | |
2b69942f | 33 | #include <linux/posix-timers.h> |
d7822b1e | 34 | #include <linux/rseq.h> |
0cd39f46 | 35 | #include <linux/seqlock.h> |
dfd402a4 | 36 | #include <linux/kcsan.h> |
5fbda3ec | 37 | #include <asm/kmap_size.h> |
a3b6714e | 38 | |
5eca1c10 | 39 | /* task_struct member predeclarations (sorted alphabetically): */ |
c7af7877 | 40 | struct audit_context; |
c7af7877 | 41 | struct backing_dev_info; |
bddd87c7 | 42 | struct bio_list; |
73c10101 | 43 | struct blk_plug; |
a10787e6 | 44 | struct bpf_local_storage; |
3c93a0c0 | 45 | struct capture_control; |
c7af7877 | 46 | struct cfs_rq; |
c7af7877 IM |
47 | struct fs_struct; |
48 | struct futex_pi_state; | |
49 | struct io_context; | |
1875dc5b | 50 | struct io_uring_task; |
c7af7877 | 51 | struct mempolicy; |
89076bc3 | 52 | struct nameidata; |
c7af7877 IM |
53 | struct nsproxy; |
54 | struct perf_event_context; | |
55 | struct pid_namespace; | |
56 | struct pipe_inode_info; | |
57 | struct rcu_node; | |
58 | struct reclaim_state; | |
59 | struct robust_list_head; | |
3c93a0c0 QY |
60 | struct root_domain; |
61 | struct rq; | |
c7af7877 IM |
62 | struct sched_attr; |
63 | struct sched_param; | |
43ae34cb | 64 | struct seq_file; |
c7af7877 IM |
65 | struct sighand_struct; |
66 | struct signal_struct; | |
67 | struct task_delay_info; | |
4cf86d77 | 68 | struct task_group; |
1da177e4 | 69 | |
4a8342d2 LT |
70 | /* |
71 | * Task state bitmask. NOTE! These bits are also | |
72 | * encoded in fs/proc/array.c: get_task_state(). | |
73 | * | |
74 | * We have two separate sets of flags: task->state | |
75 | * is about runnability, while task->exit_state are | |
76 | * about the task exiting. Confusing, but this way | |
77 | * modifying one set can't modify the other one by | |
78 | * mistake. | |
79 | */ | |
5eca1c10 IM |
80 | |
81 | /* Used in tsk->state: */ | |
92c4bc9f PZ |
82 | #define TASK_RUNNING 0x0000 |
83 | #define TASK_INTERRUPTIBLE 0x0001 | |
84 | #define TASK_UNINTERRUPTIBLE 0x0002 | |
85 | #define __TASK_STOPPED 0x0004 | |
86 | #define __TASK_TRACED 0x0008 | |
5eca1c10 | 87 | /* Used in tsk->exit_state: */ |
92c4bc9f PZ |
88 | #define EXIT_DEAD 0x0010 |
89 | #define EXIT_ZOMBIE 0x0020 | |
5eca1c10 IM |
90 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) |
91 | /* Used in tsk->state again: */ | |
8ef9925b PZ |
92 | #define TASK_PARKED 0x0040 |
93 | #define TASK_DEAD 0x0080 | |
94 | #define TASK_WAKEKILL 0x0100 | |
95 | #define TASK_WAKING 0x0200 | |
92c4bc9f PZ |
96 | #define TASK_NOLOAD 0x0400 |
97 | #define TASK_NEW 0x0800 | |
98 | #define TASK_STATE_MAX 0x1000 | |
5eca1c10 | 99 | |
5eca1c10 IM |
100 | /* Convenience macros for the sake of set_current_state: */ |
101 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
102 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
103 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
104 | ||
105 | #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD) | |
106 | ||
107 | /* Convenience macros for the sake of wake_up(): */ | |
108 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
5eca1c10 IM |
109 | |
110 | /* get_task_state(): */ | |
111 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
112 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ | |
8ef9925b PZ |
113 | __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \ |
114 | TASK_PARKED) | |
5eca1c10 | 115 | |
2f064a59 | 116 | #define task_is_running(task) (READ_ONCE((task)->__state) == TASK_RUNNING) |
5eca1c10 | 117 | |
2f064a59 | 118 | #define task_is_traced(task) ((READ_ONCE(task->__state) & __TASK_TRACED) != 0) |
5eca1c10 | 119 | |
2f064a59 | 120 | #define task_is_stopped(task) ((READ_ONCE(task->__state) & __TASK_STOPPED) != 0) |
5eca1c10 | 121 | |
2f064a59 | 122 | #define task_is_stopped_or_traced(task) ((READ_ONCE(task->__state) & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
5eca1c10 | 123 | |
8eb23b9f PZ |
124 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
125 | ||
b5bf9a90 PZ |
126 | /* |
127 | * Special states are those that do not use the normal wait-loop pattern. See | |
128 | * the comment with set_special_state(). | |
129 | */ | |
130 | #define is_special_task_state(state) \ | |
1cef1150 | 131 | ((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD)) |
b5bf9a90 | 132 | |
8eb23b9f PZ |
133 | #define __set_current_state(state_value) \ |
134 | do { \ | |
b5bf9a90 | 135 | WARN_ON_ONCE(is_special_task_state(state_value));\ |
8eb23b9f | 136 | current->task_state_change = _THIS_IP_; \ |
2f064a59 | 137 | WRITE_ONCE(current->__state, (state_value)); \ |
8eb23b9f | 138 | } while (0) |
b5bf9a90 | 139 | |
8eb23b9f PZ |
140 | #define set_current_state(state_value) \ |
141 | do { \ | |
b5bf9a90 | 142 | WARN_ON_ONCE(is_special_task_state(state_value));\ |
8eb23b9f | 143 | current->task_state_change = _THIS_IP_; \ |
2f064a59 | 144 | smp_store_mb(current->__state, (state_value)); \ |
8eb23b9f PZ |
145 | } while (0) |
146 | ||
b5bf9a90 PZ |
147 | #define set_special_state(state_value) \ |
148 | do { \ | |
149 | unsigned long flags; /* may shadow */ \ | |
150 | WARN_ON_ONCE(!is_special_task_state(state_value)); \ | |
151 | raw_spin_lock_irqsave(¤t->pi_lock, flags); \ | |
152 | current->task_state_change = _THIS_IP_; \ | |
2f064a59 | 153 | WRITE_ONCE(current->__state, (state_value)); \ |
b5bf9a90 PZ |
154 | raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \ |
155 | } while (0) | |
8eb23b9f | 156 | #else |
498d0c57 AM |
157 | /* |
158 | * set_current_state() includes a barrier so that the write of current->state | |
159 | * is correctly serialised wrt the caller's subsequent test of whether to | |
160 | * actually sleep: | |
161 | * | |
a2250238 | 162 | * for (;;) { |
498d0c57 | 163 | * set_current_state(TASK_UNINTERRUPTIBLE); |
58877d34 PZ |
164 | * if (CONDITION) |
165 | * break; | |
a2250238 PZ |
166 | * |
167 | * schedule(); | |
168 | * } | |
169 | * __set_current_state(TASK_RUNNING); | |
170 | * | |
171 | * If the caller does not need such serialisation (because, for instance, the | |
58877d34 | 172 | * CONDITION test and condition change and wakeup are under the same lock) then |
a2250238 PZ |
173 | * use __set_current_state(). |
174 | * | |
175 | * The above is typically ordered against the wakeup, which does: | |
176 | * | |
58877d34 | 177 | * CONDITION = 1; |
b5bf9a90 | 178 | * wake_up_state(p, TASK_UNINTERRUPTIBLE); |
a2250238 | 179 | * |
58877d34 PZ |
180 | * where wake_up_state()/try_to_wake_up() executes a full memory barrier before |
181 | * accessing p->state. | |
a2250238 PZ |
182 | * |
183 | * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is, | |
184 | * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a | |
185 | * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING). | |
498d0c57 | 186 | * |
b5bf9a90 | 187 | * However, with slightly different timing the wakeup TASK_RUNNING store can |
dfcb245e | 188 | * also collide with the TASK_UNINTERRUPTIBLE store. Losing that store is not |
b5bf9a90 PZ |
189 | * a problem either because that will result in one extra go around the loop |
190 | * and our @cond test will save the day. | |
498d0c57 | 191 | * |
a2250238 | 192 | * Also see the comments of try_to_wake_up(). |
498d0c57 | 193 | */ |
b5bf9a90 | 194 | #define __set_current_state(state_value) \ |
2f064a59 | 195 | WRITE_ONCE(current->__state, (state_value)) |
b5bf9a90 PZ |
196 | |
197 | #define set_current_state(state_value) \ | |
2f064a59 | 198 | smp_store_mb(current->__state, (state_value)) |
b5bf9a90 PZ |
199 | |
200 | /* | |
201 | * set_special_state() should be used for those states when the blocking task | |
202 | * can not use the regular condition based wait-loop. In that case we must | |
203 | * serialize against wakeups such that any possible in-flight TASK_RUNNING stores | |
204 | * will not collide with our state change. | |
205 | */ | |
206 | #define set_special_state(state_value) \ | |
207 | do { \ | |
208 | unsigned long flags; /* may shadow */ \ | |
209 | raw_spin_lock_irqsave(¤t->pi_lock, flags); \ | |
2f064a59 | 210 | WRITE_ONCE(current->__state, (state_value)); \ |
b5bf9a90 PZ |
211 | raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \ |
212 | } while (0) | |
213 | ||
8eb23b9f PZ |
214 | #endif |
215 | ||
2f064a59 | 216 | #define get_current_state() READ_ONCE(current->__state) |
d6c23bb3 | 217 | |
5eca1c10 IM |
218 | /* Task command name length: */ |
219 | #define TASK_COMM_LEN 16 | |
1da177e4 | 220 | |
1da177e4 LT |
221 | extern void scheduler_tick(void); |
222 | ||
5eca1c10 IM |
223 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
224 | ||
225 | extern long schedule_timeout(long timeout); | |
226 | extern long schedule_timeout_interruptible(long timeout); | |
227 | extern long schedule_timeout_killable(long timeout); | |
228 | extern long schedule_timeout_uninterruptible(long timeout); | |
229 | extern long schedule_timeout_idle(long timeout); | |
1da177e4 | 230 | asmlinkage void schedule(void); |
c5491ea7 | 231 | extern void schedule_preempt_disabled(void); |
19c95f26 | 232 | asmlinkage void preempt_schedule_irq(void); |
1da177e4 | 233 | |
10ab5643 TH |
234 | extern int __must_check io_schedule_prepare(void); |
235 | extern void io_schedule_finish(int token); | |
9cff8ade | 236 | extern long io_schedule_timeout(long timeout); |
10ab5643 | 237 | extern void io_schedule(void); |
9cff8ade | 238 | |
d37f761d | 239 | /** |
0ba42a59 | 240 | * struct prev_cputime - snapshot of system and user cputime |
d37f761d FW |
241 | * @utime: time spent in user mode |
242 | * @stime: time spent in system mode | |
9d7fb042 | 243 | * @lock: protects the above two fields |
d37f761d | 244 | * |
9d7fb042 PZ |
245 | * Stores previous user/system time values such that we can guarantee |
246 | * monotonicity. | |
d37f761d | 247 | */ |
9d7fb042 PZ |
248 | struct prev_cputime { |
249 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
5eca1c10 IM |
250 | u64 utime; |
251 | u64 stime; | |
252 | raw_spinlock_t lock; | |
9d7fb042 | 253 | #endif |
d37f761d FW |
254 | }; |
255 | ||
bac5b6b6 FW |
256 | enum vtime_state { |
257 | /* Task is sleeping or running in a CPU with VTIME inactive: */ | |
258 | VTIME_INACTIVE = 0, | |
14faf6fc FW |
259 | /* Task is idle */ |
260 | VTIME_IDLE, | |
bac5b6b6 FW |
261 | /* Task runs in kernelspace in a CPU with VTIME active: */ |
262 | VTIME_SYS, | |
14faf6fc FW |
263 | /* Task runs in userspace in a CPU with VTIME active: */ |
264 | VTIME_USER, | |
e6d5bf3e FW |
265 | /* Task runs as guests in a CPU with VTIME active: */ |
266 | VTIME_GUEST, | |
bac5b6b6 FW |
267 | }; |
268 | ||
269 | struct vtime { | |
270 | seqcount_t seqcount; | |
271 | unsigned long long starttime; | |
272 | enum vtime_state state; | |
802f4a82 | 273 | unsigned int cpu; |
2a42eb95 WL |
274 | u64 utime; |
275 | u64 stime; | |
276 | u64 gtime; | |
bac5b6b6 FW |
277 | }; |
278 | ||
69842cba PB |
279 | /* |
280 | * Utilization clamp constraints. | |
281 | * @UCLAMP_MIN: Minimum utilization | |
282 | * @UCLAMP_MAX: Maximum utilization | |
283 | * @UCLAMP_CNT: Utilization clamp constraints count | |
284 | */ | |
285 | enum uclamp_id { | |
286 | UCLAMP_MIN = 0, | |
287 | UCLAMP_MAX, | |
288 | UCLAMP_CNT | |
289 | }; | |
290 | ||
f9a25f77 MP |
291 | #ifdef CONFIG_SMP |
292 | extern struct root_domain def_root_domain; | |
293 | extern struct mutex sched_domains_mutex; | |
294 | #endif | |
295 | ||
1da177e4 | 296 | struct sched_info { |
7f5f8e8d | 297 | #ifdef CONFIG_SCHED_INFO |
5eca1c10 IM |
298 | /* Cumulative counters: */ |
299 | ||
300 | /* # of times we have run on this CPU: */ | |
301 | unsigned long pcount; | |
302 | ||
303 | /* Time spent waiting on a runqueue: */ | |
304 | unsigned long long run_delay; | |
305 | ||
306 | /* Timestamps: */ | |
307 | ||
308 | /* When did we last run on a CPU? */ | |
309 | unsigned long long last_arrival; | |
310 | ||
311 | /* When were we last queued to run? */ | |
312 | unsigned long long last_queued; | |
1da177e4 | 313 | |
f6db8347 | 314 | #endif /* CONFIG_SCHED_INFO */ |
7f5f8e8d | 315 | }; |
1da177e4 | 316 | |
6ecdd749 YD |
317 | /* |
318 | * Integer metrics need fixed point arithmetic, e.g., sched/fair | |
319 | * has a few: load, load_avg, util_avg, freq, and capacity. | |
320 | * | |
321 | * We define a basic fixed point arithmetic range, and then formalize | |
322 | * all these metrics based on that basic range. | |
323 | */ | |
5eca1c10 IM |
324 | # define SCHED_FIXEDPOINT_SHIFT 10 |
325 | # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT) | |
6ecdd749 | 326 | |
69842cba PB |
327 | /* Increase resolution of cpu_capacity calculations */ |
328 | # define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT | |
329 | # define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT) | |
330 | ||
20b8a59f | 331 | struct load_weight { |
5eca1c10 IM |
332 | unsigned long weight; |
333 | u32 inv_weight; | |
20b8a59f IM |
334 | }; |
335 | ||
7f65ea42 PB |
336 | /** |
337 | * struct util_est - Estimation utilization of FAIR tasks | |
338 | * @enqueued: instantaneous estimated utilization of a task/cpu | |
339 | * @ewma: the Exponential Weighted Moving Average (EWMA) | |
340 | * utilization of a task | |
341 | * | |
342 | * Support data structure to track an Exponential Weighted Moving Average | |
343 | * (EWMA) of a FAIR task's utilization. New samples are added to the moving | |
344 | * average each time a task completes an activation. Sample's weight is chosen | |
345 | * so that the EWMA will be relatively insensitive to transient changes to the | |
346 | * task's workload. | |
347 | * | |
348 | * The enqueued attribute has a slightly different meaning for tasks and cpus: | |
349 | * - task: the task's util_avg at last task dequeue time | |
350 | * - cfs_rq: the sum of util_est.enqueued for each RUNNABLE task on that CPU | |
351 | * Thus, the util_est.enqueued of a task represents the contribution on the | |
352 | * estimated utilization of the CPU where that task is currently enqueued. | |
353 | * | |
354 | * Only for tasks we track a moving average of the past instantaneous | |
355 | * estimated utilization. This allows to absorb sporadic drops in utilization | |
356 | * of an otherwise almost periodic task. | |
68d7a190 DE |
357 | * |
358 | * The UTIL_AVG_UNCHANGED flag is used to synchronize util_est with util_avg | |
359 | * updates. When a task is dequeued, its util_est should not be updated if its | |
360 | * util_avg has not been updated in the meantime. | |
361 | * This information is mapped into the MSB bit of util_est.enqueued at dequeue | |
362 | * time. Since max value of util_est.enqueued for a task is 1024 (PELT util_avg | |
363 | * for a task) it is safe to use MSB. | |
7f65ea42 PB |
364 | */ |
365 | struct util_est { | |
366 | unsigned int enqueued; | |
367 | unsigned int ewma; | |
368 | #define UTIL_EST_WEIGHT_SHIFT 2 | |
68d7a190 | 369 | #define UTIL_AVG_UNCHANGED 0x80000000 |
317d359d | 370 | } __attribute__((__aligned__(sizeof(u64)))); |
7f65ea42 | 371 | |
9d89c257 | 372 | /* |
9f683953 | 373 | * The load/runnable/util_avg accumulates an infinite geometric series |
0dacee1b | 374 | * (see __update_load_avg_cfs_rq() in kernel/sched/pelt.c). |
7b595334 YD |
375 | * |
376 | * [load_avg definition] | |
377 | * | |
378 | * load_avg = runnable% * scale_load_down(load) | |
379 | * | |
9f683953 VG |
380 | * [runnable_avg definition] |
381 | * | |
382 | * runnable_avg = runnable% * SCHED_CAPACITY_SCALE | |
7b595334 | 383 | * |
7b595334 YD |
384 | * [util_avg definition] |
385 | * | |
386 | * util_avg = running% * SCHED_CAPACITY_SCALE | |
387 | * | |
9f683953 VG |
388 | * where runnable% is the time ratio that a sched_entity is runnable and |
389 | * running% the time ratio that a sched_entity is running. | |
390 | * | |
391 | * For cfs_rq, they are the aggregated values of all runnable and blocked | |
392 | * sched_entities. | |
7b595334 | 393 | * |
c1b7b8d4 | 394 | * The load/runnable/util_avg doesn't directly factor frequency scaling and CPU |
9f683953 VG |
395 | * capacity scaling. The scaling is done through the rq_clock_pelt that is used |
396 | * for computing those signals (see update_rq_clock_pelt()) | |
7b595334 | 397 | * |
23127296 VG |
398 | * N.B., the above ratios (runnable% and running%) themselves are in the |
399 | * range of [0, 1]. To do fixed point arithmetics, we therefore scale them | |
400 | * to as large a range as necessary. This is for example reflected by | |
401 | * util_avg's SCHED_CAPACITY_SCALE. | |
7b595334 YD |
402 | * |
403 | * [Overflow issue] | |
404 | * | |
405 | * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities | |
406 | * with the highest load (=88761), always runnable on a single cfs_rq, | |
407 | * and should not overflow as the number already hits PID_MAX_LIMIT. | |
408 | * | |
409 | * For all other cases (including 32-bit kernels), struct load_weight's | |
410 | * weight will overflow first before we do, because: | |
411 | * | |
412 | * Max(load_avg) <= Max(load.weight) | |
413 | * | |
414 | * Then it is the load_weight's responsibility to consider overflow | |
415 | * issues. | |
9d89c257 | 416 | */ |
9d85f21c | 417 | struct sched_avg { |
5eca1c10 IM |
418 | u64 last_update_time; |
419 | u64 load_sum; | |
9f683953 | 420 | u64 runnable_sum; |
5eca1c10 IM |
421 | u32 util_sum; |
422 | u32 period_contrib; | |
423 | unsigned long load_avg; | |
9f683953 | 424 | unsigned long runnable_avg; |
5eca1c10 | 425 | unsigned long util_avg; |
7f65ea42 | 426 | struct util_est util_est; |
317d359d | 427 | } ____cacheline_aligned; |
9d85f21c | 428 | |
41acab88 | 429 | struct sched_statistics { |
7f5f8e8d | 430 | #ifdef CONFIG_SCHEDSTATS |
5eca1c10 IM |
431 | u64 wait_start; |
432 | u64 wait_max; | |
433 | u64 wait_count; | |
434 | u64 wait_sum; | |
435 | u64 iowait_count; | |
436 | u64 iowait_sum; | |
437 | ||
438 | u64 sleep_start; | |
439 | u64 sleep_max; | |
440 | s64 sum_sleep_runtime; | |
441 | ||
442 | u64 block_start; | |
443 | u64 block_max; | |
444 | u64 exec_max; | |
445 | u64 slice_max; | |
446 | ||
447 | u64 nr_migrations_cold; | |
448 | u64 nr_failed_migrations_affine; | |
449 | u64 nr_failed_migrations_running; | |
450 | u64 nr_failed_migrations_hot; | |
451 | u64 nr_forced_migrations; | |
452 | ||
453 | u64 nr_wakeups; | |
454 | u64 nr_wakeups_sync; | |
455 | u64 nr_wakeups_migrate; | |
456 | u64 nr_wakeups_local; | |
457 | u64 nr_wakeups_remote; | |
458 | u64 nr_wakeups_affine; | |
459 | u64 nr_wakeups_affine_attempts; | |
460 | u64 nr_wakeups_passive; | |
461 | u64 nr_wakeups_idle; | |
41acab88 | 462 | #endif |
7f5f8e8d | 463 | }; |
41acab88 LDM |
464 | |
465 | struct sched_entity { | |
5eca1c10 IM |
466 | /* For load-balancing: */ |
467 | struct load_weight load; | |
468 | struct rb_node run_node; | |
469 | struct list_head group_node; | |
470 | unsigned int on_rq; | |
41acab88 | 471 | |
5eca1c10 IM |
472 | u64 exec_start; |
473 | u64 sum_exec_runtime; | |
474 | u64 vruntime; | |
475 | u64 prev_sum_exec_runtime; | |
41acab88 | 476 | |
5eca1c10 | 477 | u64 nr_migrations; |
41acab88 | 478 | |
5eca1c10 | 479 | struct sched_statistics statistics; |
94c18227 | 480 | |
20b8a59f | 481 | #ifdef CONFIG_FAIR_GROUP_SCHED |
5eca1c10 IM |
482 | int depth; |
483 | struct sched_entity *parent; | |
20b8a59f | 484 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 485 | struct cfs_rq *cfs_rq; |
20b8a59f | 486 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 487 | struct cfs_rq *my_q; |
9f683953 VG |
488 | /* cached value of my_q->h_nr_running */ |
489 | unsigned long runnable_weight; | |
20b8a59f | 490 | #endif |
8bd75c77 | 491 | |
141965c7 | 492 | #ifdef CONFIG_SMP |
5a107804 JO |
493 | /* |
494 | * Per entity load average tracking. | |
495 | * | |
496 | * Put into separate cache line so it does not | |
497 | * collide with read-mostly values above. | |
498 | */ | |
317d359d | 499 | struct sched_avg avg; |
9d85f21c | 500 | #endif |
20b8a59f | 501 | }; |
70b97a7f | 502 | |
fa717060 | 503 | struct sched_rt_entity { |
5eca1c10 IM |
504 | struct list_head run_list; |
505 | unsigned long timeout; | |
506 | unsigned long watchdog_stamp; | |
507 | unsigned int time_slice; | |
508 | unsigned short on_rq; | |
509 | unsigned short on_list; | |
510 | ||
511 | struct sched_rt_entity *back; | |
052f1dc7 | 512 | #ifdef CONFIG_RT_GROUP_SCHED |
5eca1c10 | 513 | struct sched_rt_entity *parent; |
6f505b16 | 514 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 515 | struct rt_rq *rt_rq; |
6f505b16 | 516 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 517 | struct rt_rq *my_q; |
6f505b16 | 518 | #endif |
3859a271 | 519 | } __randomize_layout; |
fa717060 | 520 | |
aab03e05 | 521 | struct sched_dl_entity { |
5eca1c10 | 522 | struct rb_node rb_node; |
aab03e05 DF |
523 | |
524 | /* | |
525 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 526 | * during sched_setattr(), they will remain the same until |
527 | * the next sched_setattr(). | |
aab03e05 | 528 | */ |
5eca1c10 IM |
529 | u64 dl_runtime; /* Maximum runtime for each instance */ |
530 | u64 dl_deadline; /* Relative deadline of each instance */ | |
531 | u64 dl_period; /* Separation of two instances (period) */ | |
54d6d303 | 532 | u64 dl_bw; /* dl_runtime / dl_period */ |
3effcb42 | 533 | u64 dl_density; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
534 | |
535 | /* | |
536 | * Actual scheduling parameters. Initialized with the values above, | |
dfcb245e | 537 | * they are continuously updated during task execution. Note that |
aab03e05 DF |
538 | * the remaining runtime could be < 0 in case we are in overrun. |
539 | */ | |
5eca1c10 IM |
540 | s64 runtime; /* Remaining runtime for this instance */ |
541 | u64 deadline; /* Absolute deadline for this instance */ | |
542 | unsigned int flags; /* Specifying the scheduler behaviour */ | |
aab03e05 DF |
543 | |
544 | /* | |
545 | * Some bool flags: | |
546 | * | |
547 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
548 | * task has to wait for a replenishment to be performed at the | |
549 | * next firing of dl_timer. | |
550 | * | |
2d3d891d DF |
551 | * @dl_boosted tells if we are boosted due to DI. If so we are |
552 | * outside bandwidth enforcement mechanism (but only until we | |
5bfd126e JL |
553 | * exit the critical section); |
554 | * | |
5eca1c10 | 555 | * @dl_yielded tells if task gave up the CPU before consuming |
5bfd126e | 556 | * all its available runtime during the last job. |
209a0cbd LA |
557 | * |
558 | * @dl_non_contending tells if the task is inactive while still | |
559 | * contributing to the active utilization. In other words, it | |
560 | * indicates if the inactive timer has been armed and its handler | |
561 | * has not been executed yet. This flag is useful to avoid race | |
562 | * conditions between the inactive timer handler and the wakeup | |
563 | * code. | |
34be3930 JL |
564 | * |
565 | * @dl_overrun tells if the task asked to be informed about runtime | |
566 | * overruns. | |
aab03e05 | 567 | */ |
aa5222e9 | 568 | unsigned int dl_throttled : 1; |
aa5222e9 DC |
569 | unsigned int dl_yielded : 1; |
570 | unsigned int dl_non_contending : 1; | |
34be3930 | 571 | unsigned int dl_overrun : 1; |
aab03e05 DF |
572 | |
573 | /* | |
574 | * Bandwidth enforcement timer. Each -deadline task has its | |
575 | * own bandwidth to be enforced, thus we need one timer per task. | |
576 | */ | |
5eca1c10 | 577 | struct hrtimer dl_timer; |
209a0cbd LA |
578 | |
579 | /* | |
580 | * Inactive timer, responsible for decreasing the active utilization | |
581 | * at the "0-lag time". When a -deadline task blocks, it contributes | |
582 | * to GRUB's active utilization until the "0-lag time", hence a | |
583 | * timer is needed to decrease the active utilization at the correct | |
584 | * time. | |
585 | */ | |
586 | struct hrtimer inactive_timer; | |
2279f540 JL |
587 | |
588 | #ifdef CONFIG_RT_MUTEXES | |
589 | /* | |
590 | * Priority Inheritance. When a DEADLINE scheduling entity is boosted | |
591 | * pi_se points to the donor, otherwise points to the dl_se it belongs | |
592 | * to (the original one/itself). | |
593 | */ | |
594 | struct sched_dl_entity *pi_se; | |
595 | #endif | |
aab03e05 | 596 | }; |
8bd75c77 | 597 | |
69842cba PB |
598 | #ifdef CONFIG_UCLAMP_TASK |
599 | /* Number of utilization clamp buckets (shorter alias) */ | |
600 | #define UCLAMP_BUCKETS CONFIG_UCLAMP_BUCKETS_COUNT | |
601 | ||
602 | /* | |
603 | * Utilization clamp for a scheduling entity | |
604 | * @value: clamp value "assigned" to a se | |
605 | * @bucket_id: bucket index corresponding to the "assigned" value | |
e8f14172 | 606 | * @active: the se is currently refcounted in a rq's bucket |
a509a7cd | 607 | * @user_defined: the requested clamp value comes from user-space |
69842cba PB |
608 | * |
609 | * The bucket_id is the index of the clamp bucket matching the clamp value | |
610 | * which is pre-computed and stored to avoid expensive integer divisions from | |
611 | * the fast path. | |
e8f14172 PB |
612 | * |
613 | * The active bit is set whenever a task has got an "effective" value assigned, | |
614 | * which can be different from the clamp value "requested" from user-space. | |
615 | * This allows to know a task is refcounted in the rq's bucket corresponding | |
616 | * to the "effective" bucket_id. | |
a509a7cd PB |
617 | * |
618 | * The user_defined bit is set whenever a task has got a task-specific clamp | |
619 | * value requested from userspace, i.e. the system defaults apply to this task | |
620 | * just as a restriction. This allows to relax default clamps when a less | |
621 | * restrictive task-specific value has been requested, thus allowing to | |
622 | * implement a "nice" semantic. For example, a task running with a 20% | |
623 | * default boost can still drop its own boosting to 0%. | |
69842cba PB |
624 | */ |
625 | struct uclamp_se { | |
626 | unsigned int value : bits_per(SCHED_CAPACITY_SCALE); | |
627 | unsigned int bucket_id : bits_per(UCLAMP_BUCKETS); | |
e8f14172 | 628 | unsigned int active : 1; |
a509a7cd | 629 | unsigned int user_defined : 1; |
69842cba PB |
630 | }; |
631 | #endif /* CONFIG_UCLAMP_TASK */ | |
632 | ||
1d082fd0 PM |
633 | union rcu_special { |
634 | struct { | |
5eca1c10 IM |
635 | u8 blocked; |
636 | u8 need_qs; | |
05f41571 | 637 | u8 exp_hint; /* Hint for performance. */ |
276c4104 | 638 | u8 need_mb; /* Readers need smp_mb(). */ |
8203d6d0 | 639 | } b; /* Bits. */ |
05f41571 | 640 | u32 s; /* Set of bits. */ |
1d082fd0 | 641 | }; |
86848966 | 642 | |
8dc85d54 PZ |
643 | enum perf_event_task_context { |
644 | perf_invalid_context = -1, | |
645 | perf_hw_context = 0, | |
89a1e187 | 646 | perf_sw_context, |
8dc85d54 PZ |
647 | perf_nr_task_contexts, |
648 | }; | |
649 | ||
eb61baf6 IM |
650 | struct wake_q_node { |
651 | struct wake_q_node *next; | |
652 | }; | |
653 | ||
5fbda3ec TG |
654 | struct kmap_ctrl { |
655 | #ifdef CONFIG_KMAP_LOCAL | |
656 | int idx; | |
657 | pte_t pteval[KM_MAX_IDX]; | |
658 | #endif | |
659 | }; | |
660 | ||
1da177e4 | 661 | struct task_struct { |
c65eacbe AL |
662 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
663 | /* | |
664 | * For reasons of header soup (see current_thread_info()), this | |
665 | * must be the first element of task_struct. | |
666 | */ | |
5eca1c10 | 667 | struct thread_info thread_info; |
c65eacbe | 668 | #endif |
2f064a59 | 669 | unsigned int __state; |
29e48ce8 KC |
670 | |
671 | /* | |
672 | * This begins the randomizable portion of task_struct. Only | |
673 | * scheduling-critical items should be added above here. | |
674 | */ | |
675 | randomized_struct_fields_start | |
676 | ||
5eca1c10 | 677 | void *stack; |
ec1d2819 | 678 | refcount_t usage; |
5eca1c10 IM |
679 | /* Per task flags (PF_*), defined further below: */ |
680 | unsigned int flags; | |
681 | unsigned int ptrace; | |
1da177e4 | 682 | |
2dd73a4f | 683 | #ifdef CONFIG_SMP |
5eca1c10 | 684 | int on_cpu; |
8c4890d1 | 685 | struct __call_single_node wake_entry; |
c65eacbe | 686 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
5eca1c10 IM |
687 | /* Current CPU: */ |
688 | unsigned int cpu; | |
c65eacbe | 689 | #endif |
5eca1c10 IM |
690 | unsigned int wakee_flips; |
691 | unsigned long wakee_flip_decay_ts; | |
692 | struct task_struct *last_wakee; | |
ac66f547 | 693 | |
32e839dd MG |
694 | /* |
695 | * recent_used_cpu is initially set as the last CPU used by a task | |
696 | * that wakes affine another task. Waker/wakee relationships can | |
697 | * push tasks around a CPU where each wakeup moves to the next one. | |
698 | * Tracking a recently used CPU allows a quick search for a recently | |
699 | * used CPU that may be idle. | |
700 | */ | |
701 | int recent_used_cpu; | |
5eca1c10 | 702 | int wake_cpu; |
2dd73a4f | 703 | #endif |
5eca1c10 IM |
704 | int on_rq; |
705 | ||
706 | int prio; | |
707 | int static_prio; | |
708 | int normal_prio; | |
709 | unsigned int rt_priority; | |
50e645a8 | 710 | |
5eca1c10 IM |
711 | const struct sched_class *sched_class; |
712 | struct sched_entity se; | |
713 | struct sched_rt_entity rt; | |
8a311c74 PZ |
714 | struct sched_dl_entity dl; |
715 | ||
716 | #ifdef CONFIG_SCHED_CORE | |
717 | struct rb_node core_node; | |
718 | unsigned long core_cookie; | |
d2dfa17b | 719 | unsigned int core_occupation; |
8a311c74 PZ |
720 | #endif |
721 | ||
8323f26c | 722 | #ifdef CONFIG_CGROUP_SCHED |
5eca1c10 | 723 | struct task_group *sched_task_group; |
8323f26c | 724 | #endif |
1da177e4 | 725 | |
69842cba | 726 | #ifdef CONFIG_UCLAMP_TASK |
13685c4a QY |
727 | /* |
728 | * Clamp values requested for a scheduling entity. | |
729 | * Must be updated with task_rq_lock() held. | |
730 | */ | |
e8f14172 | 731 | struct uclamp_se uclamp_req[UCLAMP_CNT]; |
13685c4a QY |
732 | /* |
733 | * Effective clamp values used for a scheduling entity. | |
734 | * Must be updated with task_rq_lock() held. | |
735 | */ | |
69842cba PB |
736 | struct uclamp_se uclamp[UCLAMP_CNT]; |
737 | #endif | |
738 | ||
e107be36 | 739 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
5eca1c10 IM |
740 | /* List of struct preempt_notifier: */ |
741 | struct hlist_head preempt_notifiers; | |
e107be36 AK |
742 | #endif |
743 | ||
6c5c9341 | 744 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
5eca1c10 | 745 | unsigned int btrace_seq; |
6c5c9341 | 746 | #endif |
1da177e4 | 747 | |
5eca1c10 IM |
748 | unsigned int policy; |
749 | int nr_cpus_allowed; | |
3bd37062 SAS |
750 | const cpumask_t *cpus_ptr; |
751 | cpumask_t cpus_mask; | |
6d337eab | 752 | void *migration_pending; |
74d862b6 | 753 | #ifdef CONFIG_SMP |
a7c81556 | 754 | unsigned short migration_disabled; |
af449901 | 755 | #endif |
a7c81556 | 756 | unsigned short migration_flags; |
1da177e4 | 757 | |
a57eb940 | 758 | #ifdef CONFIG_PREEMPT_RCU |
5eca1c10 IM |
759 | int rcu_read_lock_nesting; |
760 | union rcu_special rcu_read_unlock_special; | |
761 | struct list_head rcu_node_entry; | |
762 | struct rcu_node *rcu_blocked_node; | |
28f6569a | 763 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
5eca1c10 | 764 | |
8315f422 | 765 | #ifdef CONFIG_TASKS_RCU |
5eca1c10 | 766 | unsigned long rcu_tasks_nvcsw; |
ccdd29ff PM |
767 | u8 rcu_tasks_holdout; |
768 | u8 rcu_tasks_idx; | |
5eca1c10 | 769 | int rcu_tasks_idle_cpu; |
ccdd29ff | 770 | struct list_head rcu_tasks_holdout_list; |
8315f422 | 771 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
e260be67 | 772 | |
d5f177d3 PM |
773 | #ifdef CONFIG_TASKS_TRACE_RCU |
774 | int trc_reader_nesting; | |
775 | int trc_ipi_to_cpu; | |
276c4104 | 776 | union rcu_special trc_reader_special; |
d5f177d3 PM |
777 | bool trc_reader_checked; |
778 | struct list_head trc_holdout_list; | |
779 | #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */ | |
780 | ||
5eca1c10 | 781 | struct sched_info sched_info; |
1da177e4 | 782 | |
5eca1c10 | 783 | struct list_head tasks; |
806c09a7 | 784 | #ifdef CONFIG_SMP |
5eca1c10 IM |
785 | struct plist_node pushable_tasks; |
786 | struct rb_node pushable_dl_tasks; | |
806c09a7 | 787 | #endif |
1da177e4 | 788 | |
5eca1c10 IM |
789 | struct mm_struct *mm; |
790 | struct mm_struct *active_mm; | |
314ff785 IM |
791 | |
792 | /* Per-thread vma caching: */ | |
5eca1c10 | 793 | struct vmacache vmacache; |
314ff785 | 794 | |
5eca1c10 IM |
795 | #ifdef SPLIT_RSS_COUNTING |
796 | struct task_rss_stat rss_stat; | |
34e55232 | 797 | #endif |
5eca1c10 IM |
798 | int exit_state; |
799 | int exit_code; | |
800 | int exit_signal; | |
801 | /* The signal sent when the parent dies: */ | |
802 | int pdeath_signal; | |
803 | /* JOBCTL_*, siglock protected: */ | |
804 | unsigned long jobctl; | |
805 | ||
806 | /* Used for emulating ABI behavior of previous Linux versions: */ | |
807 | unsigned int personality; | |
808 | ||
809 | /* Scheduler bits, serialized by scheduler locks: */ | |
810 | unsigned sched_reset_on_fork:1; | |
811 | unsigned sched_contributes_to_load:1; | |
812 | unsigned sched_migrated:1; | |
eb414681 JW |
813 | #ifdef CONFIG_PSI |
814 | unsigned sched_psi_wake_requeue:1; | |
815 | #endif | |
816 | ||
5eca1c10 IM |
817 | /* Force alignment to the next boundary: */ |
818 | unsigned :0; | |
819 | ||
820 | /* Unserialized, strictly 'current' */ | |
821 | ||
f97bb527 PZ |
822 | /* |
823 | * This field must not be in the scheduler word above due to wakelist | |
824 | * queueing no longer being serialized by p->on_cpu. However: | |
825 | * | |
826 | * p->XXX = X; ttwu() | |
827 | * schedule() if (p->on_rq && ..) // false | |
828 | * smp_mb__after_spinlock(); if (smp_load_acquire(&p->on_cpu) && //true | |
829 | * deactivate_task() ttwu_queue_wakelist()) | |
830 | * p->on_rq = 0; p->sched_remote_wakeup = Y; | |
831 | * | |
832 | * guarantees all stores of 'current' are visible before | |
833 | * ->sched_remote_wakeup gets used, so it can be in this word. | |
834 | */ | |
835 | unsigned sched_remote_wakeup:1; | |
836 | ||
5eca1c10 IM |
837 | /* Bit to tell LSMs we're in execve(): */ |
838 | unsigned in_execve:1; | |
839 | unsigned in_iowait:1; | |
840 | #ifndef TIF_RESTORE_SIGMASK | |
841 | unsigned restore_sigmask:1; | |
7e781418 | 842 | #endif |
626ebc41 | 843 | #ifdef CONFIG_MEMCG |
29ef680a | 844 | unsigned in_user_fault:1; |
127424c8 | 845 | #endif |
ff303e66 | 846 | #ifdef CONFIG_COMPAT_BRK |
5eca1c10 | 847 | unsigned brk_randomized:1; |
ff303e66 | 848 | #endif |
77f88796 TH |
849 | #ifdef CONFIG_CGROUPS |
850 | /* disallow userland-initiated cgroup migration */ | |
851 | unsigned no_cgroup_migration:1; | |
76f969e8 RG |
852 | /* task is frozen/stopped (used by the cgroup freezer) */ |
853 | unsigned frozen:1; | |
77f88796 | 854 | #endif |
d09d8df3 | 855 | #ifdef CONFIG_BLK_CGROUP |
d09d8df3 JB |
856 | unsigned use_memdelay:1; |
857 | #endif | |
1066d1b6 YS |
858 | #ifdef CONFIG_PSI |
859 | /* Stalled due to lack of memory */ | |
860 | unsigned in_memstall:1; | |
861 | #endif | |
8e9b16c4 ST |
862 | #ifdef CONFIG_PAGE_OWNER |
863 | /* Used by page_owner=on to detect recursion in page tracking. */ | |
864 | unsigned in_page_owner:1; | |
865 | #endif | |
6f185c29 | 866 | |
5eca1c10 | 867 | unsigned long atomic_flags; /* Flags requiring atomic access. */ |
1d4457f9 | 868 | |
5eca1c10 | 869 | struct restart_block restart_block; |
f56141e3 | 870 | |
5eca1c10 IM |
871 | pid_t pid; |
872 | pid_t tgid; | |
0a425405 | 873 | |
050e9baa | 874 | #ifdef CONFIG_STACKPROTECTOR |
5eca1c10 IM |
875 | /* Canary value for the -fstack-protector GCC feature: */ |
876 | unsigned long stack_canary; | |
1314562a | 877 | #endif |
4d1d61a6 | 878 | /* |
5eca1c10 | 879 | * Pointers to the (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 880 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 881 | * p->real_parent->pid) |
1da177e4 | 882 | */ |
5eca1c10 IM |
883 | |
884 | /* Real parent process: */ | |
885 | struct task_struct __rcu *real_parent; | |
886 | ||
887 | /* Recipient of SIGCHLD, wait4() reports: */ | |
888 | struct task_struct __rcu *parent; | |
889 | ||
1da177e4 | 890 | /* |
5eca1c10 | 891 | * Children/sibling form the list of natural children: |
1da177e4 | 892 | */ |
5eca1c10 IM |
893 | struct list_head children; |
894 | struct list_head sibling; | |
895 | struct task_struct *group_leader; | |
1da177e4 | 896 | |
f470021a | 897 | /* |
5eca1c10 IM |
898 | * 'ptraced' is the list of tasks this task is using ptrace() on. |
899 | * | |
f470021a | 900 | * This includes both natural children and PTRACE_ATTACH targets. |
5eca1c10 | 901 | * 'ptrace_entry' is this task's link on the p->parent->ptraced list. |
f470021a | 902 | */ |
5eca1c10 IM |
903 | struct list_head ptraced; |
904 | struct list_head ptrace_entry; | |
f470021a | 905 | |
1da177e4 | 906 | /* PID/PID hash table linkage. */ |
2c470475 EB |
907 | struct pid *thread_pid; |
908 | struct hlist_node pid_links[PIDTYPE_MAX]; | |
5eca1c10 IM |
909 | struct list_head thread_group; |
910 | struct list_head thread_node; | |
911 | ||
912 | struct completion *vfork_done; | |
1da177e4 | 913 | |
5eca1c10 IM |
914 | /* CLONE_CHILD_SETTID: */ |
915 | int __user *set_child_tid; | |
1da177e4 | 916 | |
5eca1c10 IM |
917 | /* CLONE_CHILD_CLEARTID: */ |
918 | int __user *clear_child_tid; | |
919 | ||
3bfe6106 JA |
920 | /* PF_IO_WORKER */ |
921 | void *pf_io_worker; | |
922 | ||
5eca1c10 IM |
923 | u64 utime; |
924 | u64 stime; | |
40565b5a | 925 | #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME |
5eca1c10 IM |
926 | u64 utimescaled; |
927 | u64 stimescaled; | |
40565b5a | 928 | #endif |
5eca1c10 IM |
929 | u64 gtime; |
930 | struct prev_cputime prev_cputime; | |
6a61671b | 931 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
bac5b6b6 | 932 | struct vtime vtime; |
d99ca3b9 | 933 | #endif |
d027d45d FW |
934 | |
935 | #ifdef CONFIG_NO_HZ_FULL | |
5eca1c10 | 936 | atomic_t tick_dep_mask; |
d027d45d | 937 | #endif |
5eca1c10 IM |
938 | /* Context switch counts: */ |
939 | unsigned long nvcsw; | |
940 | unsigned long nivcsw; | |
941 | ||
942 | /* Monotonic time in nsecs: */ | |
943 | u64 start_time; | |
944 | ||
945 | /* Boot based time in nsecs: */ | |
cf25e24d | 946 | u64 start_boottime; |
5eca1c10 IM |
947 | |
948 | /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */ | |
949 | unsigned long min_flt; | |
950 | unsigned long maj_flt; | |
1da177e4 | 951 | |
2b69942f TG |
952 | /* Empty if CONFIG_POSIX_CPUTIMERS=n */ |
953 | struct posix_cputimers posix_cputimers; | |
1da177e4 | 954 | |
1fb497dd TG |
955 | #ifdef CONFIG_POSIX_CPU_TIMERS_TASK_WORK |
956 | struct posix_cputimers_work posix_cputimers_work; | |
957 | #endif | |
958 | ||
5eca1c10 IM |
959 | /* Process credentials: */ |
960 | ||
961 | /* Tracer's credentials at attach: */ | |
962 | const struct cred __rcu *ptracer_cred; | |
963 | ||
964 | /* Objective and real subjective task credentials (COW): */ | |
965 | const struct cred __rcu *real_cred; | |
966 | ||
967 | /* Effective (overridable) subjective task credentials (COW): */ | |
968 | const struct cred __rcu *cred; | |
969 | ||
7743c48e DH |
970 | #ifdef CONFIG_KEYS |
971 | /* Cached requested key. */ | |
972 | struct key *cached_requested_key; | |
973 | #endif | |
974 | ||
5eca1c10 IM |
975 | /* |
976 | * executable name, excluding path. | |
977 | * | |
978 | * - normally initialized setup_new_exec() | |
979 | * - access it with [gs]et_task_comm() | |
980 | * - lock it with task_lock() | |
981 | */ | |
982 | char comm[TASK_COMM_LEN]; | |
983 | ||
984 | struct nameidata *nameidata; | |
985 | ||
3d5b6fcc | 986 | #ifdef CONFIG_SYSVIPC |
5eca1c10 IM |
987 | struct sysv_sem sysvsem; |
988 | struct sysv_shm sysvshm; | |
3d5b6fcc | 989 | #endif |
e162b39a | 990 | #ifdef CONFIG_DETECT_HUNG_TASK |
5eca1c10 | 991 | unsigned long last_switch_count; |
a2e51445 | 992 | unsigned long last_switch_time; |
82a1fcb9 | 993 | #endif |
5eca1c10 IM |
994 | /* Filesystem information: */ |
995 | struct fs_struct *fs; | |
996 | ||
997 | /* Open file information: */ | |
998 | struct files_struct *files; | |
999 | ||
0f212204 JA |
1000 | #ifdef CONFIG_IO_URING |
1001 | struct io_uring_task *io_uring; | |
1002 | #endif | |
1003 | ||
5eca1c10 IM |
1004 | /* Namespaces: */ |
1005 | struct nsproxy *nsproxy; | |
1006 | ||
1007 | /* Signal handlers: */ | |
1008 | struct signal_struct *signal; | |
913292c9 | 1009 | struct sighand_struct __rcu *sighand; |
5eca1c10 IM |
1010 | sigset_t blocked; |
1011 | sigset_t real_blocked; | |
1012 | /* Restored if set_restore_sigmask() was used: */ | |
1013 | sigset_t saved_sigmask; | |
1014 | struct sigpending pending; | |
1015 | unsigned long sas_ss_sp; | |
1016 | size_t sas_ss_size; | |
1017 | unsigned int sas_ss_flags; | |
1018 | ||
1019 | struct callback_head *task_works; | |
1020 | ||
4b7d248b | 1021 | #ifdef CONFIG_AUDIT |
bfef93a5 | 1022 | #ifdef CONFIG_AUDITSYSCALL |
5f3d544f RGB |
1023 | struct audit_context *audit_context; |
1024 | #endif | |
5eca1c10 IM |
1025 | kuid_t loginuid; |
1026 | unsigned int sessionid; | |
bfef93a5 | 1027 | #endif |
5eca1c10 | 1028 | struct seccomp seccomp; |
1446e1df | 1029 | struct syscall_user_dispatch syscall_dispatch; |
5eca1c10 IM |
1030 | |
1031 | /* Thread group tracking: */ | |
d1e7fd64 EB |
1032 | u64 parent_exec_id; |
1033 | u64 self_exec_id; | |
1da177e4 | 1034 | |
5eca1c10 IM |
1035 | /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */ |
1036 | spinlock_t alloc_lock; | |
1da177e4 | 1037 | |
b29739f9 | 1038 | /* Protection of the PI data structures: */ |
5eca1c10 | 1039 | raw_spinlock_t pi_lock; |
b29739f9 | 1040 | |
5eca1c10 | 1041 | struct wake_q_node wake_q; |
76751049 | 1042 | |
23f78d4a | 1043 | #ifdef CONFIG_RT_MUTEXES |
5eca1c10 | 1044 | /* PI waiters blocked on a rt_mutex held by this task: */ |
a23ba907 | 1045 | struct rb_root_cached pi_waiters; |
e96a7705 XP |
1046 | /* Updated under owner's pi_lock and rq lock */ |
1047 | struct task_struct *pi_top_task; | |
5eca1c10 IM |
1048 | /* Deadlock detection and priority inheritance handling: */ |
1049 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1050 | #endif |
1051 | ||
408894ee | 1052 | #ifdef CONFIG_DEBUG_MUTEXES |
5eca1c10 IM |
1053 | /* Mutex deadlock detection: */ |
1054 | struct mutex_waiter *blocked_on; | |
408894ee | 1055 | #endif |
5eca1c10 | 1056 | |
312364f3 DV |
1057 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
1058 | int non_block_count; | |
1059 | #endif | |
1060 | ||
de30a2b3 | 1061 | #ifdef CONFIG_TRACE_IRQFLAGS |
0584df9c | 1062 | struct irqtrace_events irqtrace; |
de8f5e4f | 1063 | unsigned int hardirq_threaded; |
c86e9b98 | 1064 | u64 hardirq_chain_key; |
5eca1c10 IM |
1065 | int softirqs_enabled; |
1066 | int softirq_context; | |
40db1739 | 1067 | int irq_config; |
de30a2b3 | 1068 | #endif |
728b478d TG |
1069 | #ifdef CONFIG_PREEMPT_RT |
1070 | int softirq_disable_cnt; | |
1071 | #endif | |
5eca1c10 | 1072 | |
fbb9ce95 | 1073 | #ifdef CONFIG_LOCKDEP |
5eca1c10 IM |
1074 | # define MAX_LOCK_DEPTH 48UL |
1075 | u64 curr_chain_key; | |
1076 | int lockdep_depth; | |
1077 | unsigned int lockdep_recursion; | |
1078 | struct held_lock held_locks[MAX_LOCK_DEPTH]; | |
fbb9ce95 | 1079 | #endif |
5eca1c10 | 1080 | |
5cf53f3c | 1081 | #if defined(CONFIG_UBSAN) && !defined(CONFIG_UBSAN_TRAP) |
5eca1c10 | 1082 | unsigned int in_ubsan; |
c6d30853 | 1083 | #endif |
408894ee | 1084 | |
5eca1c10 IM |
1085 | /* Journalling filesystem info: */ |
1086 | void *journal_info; | |
1da177e4 | 1087 | |
5eca1c10 IM |
1088 | /* Stacked block device info: */ |
1089 | struct bio_list *bio_list; | |
d89d8796 | 1090 | |
73c10101 | 1091 | #ifdef CONFIG_BLOCK |
5eca1c10 IM |
1092 | /* Stack plugging: */ |
1093 | struct blk_plug *plug; | |
73c10101 JA |
1094 | #endif |
1095 | ||
5eca1c10 IM |
1096 | /* VM state: */ |
1097 | struct reclaim_state *reclaim_state; | |
1098 | ||
1099 | struct backing_dev_info *backing_dev_info; | |
1da177e4 | 1100 | |
5eca1c10 | 1101 | struct io_context *io_context; |
1da177e4 | 1102 | |
5e1f0f09 MG |
1103 | #ifdef CONFIG_COMPACTION |
1104 | struct capture_control *capture_control; | |
1105 | #endif | |
5eca1c10 IM |
1106 | /* Ptrace state: */ |
1107 | unsigned long ptrace_message; | |
ae7795bc | 1108 | kernel_siginfo_t *last_siginfo; |
1da177e4 | 1109 | |
5eca1c10 | 1110 | struct task_io_accounting ioac; |
eb414681 JW |
1111 | #ifdef CONFIG_PSI |
1112 | /* Pressure stall state */ | |
1113 | unsigned int psi_flags; | |
1114 | #endif | |
5eca1c10 IM |
1115 | #ifdef CONFIG_TASK_XACCT |
1116 | /* Accumulated RSS usage: */ | |
1117 | u64 acct_rss_mem1; | |
1118 | /* Accumulated virtual memory usage: */ | |
1119 | u64 acct_vm_mem1; | |
1120 | /* stime + utime since last update: */ | |
1121 | u64 acct_timexpd; | |
1da177e4 LT |
1122 | #endif |
1123 | #ifdef CONFIG_CPUSETS | |
5eca1c10 IM |
1124 | /* Protected by ->alloc_lock: */ |
1125 | nodemask_t mems_allowed; | |
3b03706f | 1126 | /* Sequence number to catch updates: */ |
b7505861 | 1127 | seqcount_spinlock_t mems_allowed_seq; |
5eca1c10 IM |
1128 | int cpuset_mem_spread_rotor; |
1129 | int cpuset_slab_spread_rotor; | |
1da177e4 | 1130 | #endif |
ddbcc7e8 | 1131 | #ifdef CONFIG_CGROUPS |
5eca1c10 IM |
1132 | /* Control Group info protected by css_set_lock: */ |
1133 | struct css_set __rcu *cgroups; | |
1134 | /* cg_list protected by css_set_lock and tsk->alloc_lock: */ | |
1135 | struct list_head cg_list; | |
ddbcc7e8 | 1136 | #endif |
e6d42931 | 1137 | #ifdef CONFIG_X86_CPU_RESCTRL |
0734ded1 | 1138 | u32 closid; |
d6aaba61 | 1139 | u32 rmid; |
e02737d5 | 1140 | #endif |
42b2dd0a | 1141 | #ifdef CONFIG_FUTEX |
5eca1c10 | 1142 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1143 | #ifdef CONFIG_COMPAT |
1144 | struct compat_robust_list_head __user *compat_robust_list; | |
1145 | #endif | |
5eca1c10 IM |
1146 | struct list_head pi_state_list; |
1147 | struct futex_pi_state *pi_state_cache; | |
3f186d97 | 1148 | struct mutex futex_exit_mutex; |
3d4775df | 1149 | unsigned int futex_state; |
c7aceaba | 1150 | #endif |
cdd6c482 | 1151 | #ifdef CONFIG_PERF_EVENTS |
5eca1c10 IM |
1152 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
1153 | struct mutex perf_event_mutex; | |
1154 | struct list_head perf_event_list; | |
a63eaf34 | 1155 | #endif |
8f47b187 | 1156 | #ifdef CONFIG_DEBUG_PREEMPT |
5eca1c10 | 1157 | unsigned long preempt_disable_ip; |
8f47b187 | 1158 | #endif |
c7aceaba | 1159 | #ifdef CONFIG_NUMA |
5eca1c10 IM |
1160 | /* Protected by alloc_lock: */ |
1161 | struct mempolicy *mempolicy; | |
45816682 | 1162 | short il_prev; |
5eca1c10 | 1163 | short pref_node_fork; |
42b2dd0a | 1164 | #endif |
cbee9f88 | 1165 | #ifdef CONFIG_NUMA_BALANCING |
5eca1c10 IM |
1166 | int numa_scan_seq; |
1167 | unsigned int numa_scan_period; | |
1168 | unsigned int numa_scan_period_max; | |
1169 | int numa_preferred_nid; | |
1170 | unsigned long numa_migrate_retry; | |
1171 | /* Migration stamp: */ | |
1172 | u64 node_stamp; | |
1173 | u64 last_task_numa_placement; | |
1174 | u64 last_sum_exec_runtime; | |
1175 | struct callback_head numa_work; | |
1176 | ||
cb361d8c JH |
1177 | /* |
1178 | * This pointer is only modified for current in syscall and | |
1179 | * pagefault context (and for tasks being destroyed), so it can be read | |
1180 | * from any of the following contexts: | |
1181 | * - RCU read-side critical section | |
1182 | * - current->numa_group from everywhere | |
1183 | * - task's runqueue locked, task not running | |
1184 | */ | |
1185 | struct numa_group __rcu *numa_group; | |
8c8a743c | 1186 | |
745d6147 | 1187 | /* |
44dba3d5 IM |
1188 | * numa_faults is an array split into four regions: |
1189 | * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer | |
1190 | * in this precise order. | |
1191 | * | |
1192 | * faults_memory: Exponential decaying average of faults on a per-node | |
1193 | * basis. Scheduling placement decisions are made based on these | |
1194 | * counts. The values remain static for the duration of a PTE scan. | |
1195 | * faults_cpu: Track the nodes the process was running on when a NUMA | |
1196 | * hinting fault was incurred. | |
1197 | * faults_memory_buffer and faults_cpu_buffer: Record faults per node | |
1198 | * during the current scan window. When the scan completes, the counts | |
1199 | * in faults_memory and faults_cpu decay and these values are copied. | |
745d6147 | 1200 | */ |
5eca1c10 IM |
1201 | unsigned long *numa_faults; |
1202 | unsigned long total_numa_faults; | |
745d6147 | 1203 | |
04bb2f94 RR |
1204 | /* |
1205 | * numa_faults_locality tracks if faults recorded during the last | |
074c2381 MG |
1206 | * scan window were remote/local or failed to migrate. The task scan |
1207 | * period is adapted based on the locality of the faults with different | |
1208 | * weights depending on whether they were shared or private faults | |
04bb2f94 | 1209 | */ |
5eca1c10 | 1210 | unsigned long numa_faults_locality[3]; |
04bb2f94 | 1211 | |
5eca1c10 | 1212 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
1213 | #endif /* CONFIG_NUMA_BALANCING */ |
1214 | ||
d7822b1e MD |
1215 | #ifdef CONFIG_RSEQ |
1216 | struct rseq __user *rseq; | |
d7822b1e MD |
1217 | u32 rseq_sig; |
1218 | /* | |
1219 | * RmW on rseq_event_mask must be performed atomically | |
1220 | * with respect to preemption. | |
1221 | */ | |
1222 | unsigned long rseq_event_mask; | |
1223 | #endif | |
1224 | ||
5eca1c10 | 1225 | struct tlbflush_unmap_batch tlb_ubc; |
72b252ae | 1226 | |
3fbd7ee2 EB |
1227 | union { |
1228 | refcount_t rcu_users; | |
1229 | struct rcu_head rcu; | |
1230 | }; | |
b92ce558 | 1231 | |
5eca1c10 IM |
1232 | /* Cache last used pipe for splice(): */ |
1233 | struct pipe_inode_info *splice_pipe; | |
5640f768 | 1234 | |
5eca1c10 | 1235 | struct page_frag task_frag; |
5640f768 | 1236 | |
47913d4e IM |
1237 | #ifdef CONFIG_TASK_DELAY_ACCT |
1238 | struct task_delay_info *delays; | |
f4f154fd | 1239 | #endif |
47913d4e | 1240 | |
f4f154fd | 1241 | #ifdef CONFIG_FAULT_INJECTION |
5eca1c10 | 1242 | int make_it_fail; |
9049f2f6 | 1243 | unsigned int fail_nth; |
ca74e92b | 1244 | #endif |
9d823e8f | 1245 | /* |
5eca1c10 IM |
1246 | * When (nr_dirtied >= nr_dirtied_pause), it's time to call |
1247 | * balance_dirty_pages() for a dirty throttling pause: | |
9d823e8f | 1248 | */ |
5eca1c10 IM |
1249 | int nr_dirtied; |
1250 | int nr_dirtied_pause; | |
1251 | /* Start of a write-and-pause period: */ | |
1252 | unsigned long dirty_paused_when; | |
9d823e8f | 1253 | |
9745512c | 1254 | #ifdef CONFIG_LATENCYTOP |
5eca1c10 IM |
1255 | int latency_record_count; |
1256 | struct latency_record latency_record[LT_SAVECOUNT]; | |
9745512c | 1257 | #endif |
6976675d | 1258 | /* |
5eca1c10 | 1259 | * Time slack values; these are used to round up poll() and |
6976675d AV |
1260 | * select() etc timeout values. These are in nanoseconds. |
1261 | */ | |
5eca1c10 IM |
1262 | u64 timer_slack_ns; |
1263 | u64 default_timer_slack_ns; | |
f8d570a4 | 1264 | |
d73b4936 | 1265 | #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
5eca1c10 | 1266 | unsigned int kasan_depth; |
0b24becc | 1267 | #endif |
92c209ac | 1268 | |
dfd402a4 ME |
1269 | #ifdef CONFIG_KCSAN |
1270 | struct kcsan_ctx kcsan_ctx; | |
92c209ac ME |
1271 | #ifdef CONFIG_TRACE_IRQFLAGS |
1272 | struct irqtrace_events kcsan_save_irqtrace; | |
1273 | #endif | |
dfd402a4 | 1274 | #endif |
5eca1c10 | 1275 | |
393824f6 PA |
1276 | #if IS_ENABLED(CONFIG_KUNIT) |
1277 | struct kunit *kunit_test; | |
1278 | #endif | |
1279 | ||
fb52607a | 1280 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
5eca1c10 IM |
1281 | /* Index of current stored address in ret_stack: */ |
1282 | int curr_ret_stack; | |
39eb456d | 1283 | int curr_ret_depth; |
5eca1c10 IM |
1284 | |
1285 | /* Stack of return addresses for return function tracing: */ | |
1286 | struct ftrace_ret_stack *ret_stack; | |
1287 | ||
1288 | /* Timestamp for last schedule: */ | |
1289 | unsigned long long ftrace_timestamp; | |
1290 | ||
f201ae23 FW |
1291 | /* |
1292 | * Number of functions that haven't been traced | |
5eca1c10 | 1293 | * because of depth overrun: |
f201ae23 | 1294 | */ |
5eca1c10 IM |
1295 | atomic_t trace_overrun; |
1296 | ||
1297 | /* Pause tracing: */ | |
1298 | atomic_t tracing_graph_pause; | |
f201ae23 | 1299 | #endif |
5eca1c10 | 1300 | |
ea4e2bc4 | 1301 | #ifdef CONFIG_TRACING |
5eca1c10 IM |
1302 | /* State flags for use by tracers: */ |
1303 | unsigned long trace; | |
1304 | ||
1305 | /* Bitmask and counter of trace recursion: */ | |
1306 | unsigned long trace_recursion; | |
261842b7 | 1307 | #endif /* CONFIG_TRACING */ |
5eca1c10 | 1308 | |
5c9a8750 | 1309 | #ifdef CONFIG_KCOV |
eec028c9 AK |
1310 | /* See kernel/kcov.c for more details. */ |
1311 | ||
5eca1c10 | 1312 | /* Coverage collection mode enabled for this task (0 if disabled): */ |
0ed557aa | 1313 | unsigned int kcov_mode; |
5eca1c10 IM |
1314 | |
1315 | /* Size of the kcov_area: */ | |
1316 | unsigned int kcov_size; | |
1317 | ||
1318 | /* Buffer for coverage collection: */ | |
1319 | void *kcov_area; | |
1320 | ||
1321 | /* KCOV descriptor wired with this task or NULL: */ | |
1322 | struct kcov *kcov; | |
eec028c9 AK |
1323 | |
1324 | /* KCOV common handle for remote coverage collection: */ | |
1325 | u64 kcov_handle; | |
1326 | ||
1327 | /* KCOV sequence number: */ | |
1328 | int kcov_sequence; | |
5ff3b30a AK |
1329 | |
1330 | /* Collect coverage from softirq context: */ | |
1331 | unsigned int kcov_softirq; | |
5c9a8750 | 1332 | #endif |
5eca1c10 | 1333 | |
6f185c29 | 1334 | #ifdef CONFIG_MEMCG |
5eca1c10 IM |
1335 | struct mem_cgroup *memcg_in_oom; |
1336 | gfp_t memcg_oom_gfp_mask; | |
1337 | int memcg_oom_order; | |
b23afb93 | 1338 | |
5eca1c10 IM |
1339 | /* Number of pages to reclaim on returning to userland: */ |
1340 | unsigned int memcg_nr_pages_over_high; | |
d46eb14b SB |
1341 | |
1342 | /* Used by memcontrol for targeted memcg charge: */ | |
1343 | struct mem_cgroup *active_memcg; | |
569b846d | 1344 | #endif |
5eca1c10 | 1345 | |
d09d8df3 JB |
1346 | #ifdef CONFIG_BLK_CGROUP |
1347 | struct request_queue *throttle_queue; | |
1348 | #endif | |
1349 | ||
0326f5a9 | 1350 | #ifdef CONFIG_UPROBES |
5eca1c10 | 1351 | struct uprobe_task *utask; |
0326f5a9 | 1352 | #endif |
cafe5635 | 1353 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
5eca1c10 IM |
1354 | unsigned int sequential_io; |
1355 | unsigned int sequential_io_avg; | |
cafe5635 | 1356 | #endif |
5fbda3ec | 1357 | struct kmap_ctrl kmap_ctrl; |
8eb23b9f | 1358 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
5eca1c10 | 1359 | unsigned long task_state_change; |
8eb23b9f | 1360 | #endif |
5eca1c10 | 1361 | int pagefault_disabled; |
03049269 | 1362 | #ifdef CONFIG_MMU |
5eca1c10 | 1363 | struct task_struct *oom_reaper_list; |
03049269 | 1364 | #endif |
ba14a194 | 1365 | #ifdef CONFIG_VMAP_STACK |
5eca1c10 | 1366 | struct vm_struct *stack_vm_area; |
ba14a194 | 1367 | #endif |
68f24b08 | 1368 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
5eca1c10 | 1369 | /* A live task holds one reference: */ |
f0b89d39 | 1370 | refcount_t stack_refcount; |
d83a7cb3 JP |
1371 | #endif |
1372 | #ifdef CONFIG_LIVEPATCH | |
1373 | int patch_state; | |
0302e28d | 1374 | #endif |
e4e55b47 TH |
1375 | #ifdef CONFIG_SECURITY |
1376 | /* Used by LSM modules for access restriction: */ | |
1377 | void *security; | |
68f24b08 | 1378 | #endif |
a10787e6 SL |
1379 | #ifdef CONFIG_BPF_SYSCALL |
1380 | /* Used by BPF task local storage */ | |
1381 | struct bpf_local_storage __rcu *bpf_storage; | |
1382 | #endif | |
29e48ce8 | 1383 | |
afaef01c AP |
1384 | #ifdef CONFIG_GCC_PLUGIN_STACKLEAK |
1385 | unsigned long lowest_stack; | |
c8d12627 | 1386 | unsigned long prev_lowest_stack; |
afaef01c AP |
1387 | #endif |
1388 | ||
5567d11c | 1389 | #ifdef CONFIG_X86_MCE |
c0ab7ffc TL |
1390 | void __user *mce_vaddr; |
1391 | __u64 mce_kflags; | |
5567d11c | 1392 | u64 mce_addr; |
17fae129 TL |
1393 | __u64 mce_ripv : 1, |
1394 | mce_whole_page : 1, | |
1395 | __mce_reserved : 62; | |
5567d11c PZ |
1396 | struct callback_head mce_kill_me; |
1397 | #endif | |
1398 | ||
d741bf41 PZ |
1399 | #ifdef CONFIG_KRETPROBES |
1400 | struct llist_head kretprobe_instances; | |
1401 | #endif | |
1402 | ||
29e48ce8 KC |
1403 | /* |
1404 | * New fields for task_struct should be added above here, so that | |
1405 | * they are included in the randomized portion of task_struct. | |
1406 | */ | |
1407 | randomized_struct_fields_end | |
1408 | ||
5eca1c10 IM |
1409 | /* CPU-specific state of this task: */ |
1410 | struct thread_struct thread; | |
1411 | ||
1412 | /* | |
1413 | * WARNING: on x86, 'thread_struct' contains a variable-sized | |
1414 | * structure. It *MUST* be at the end of 'task_struct'. | |
1415 | * | |
1416 | * Do not put anything below here! | |
1417 | */ | |
1da177e4 LT |
1418 | }; |
1419 | ||
e868171a | 1420 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 | 1421 | { |
2c470475 | 1422 | return task->thread_pid; |
22c935f4 EB |
1423 | } |
1424 | ||
7af57294 PE |
1425 | /* |
1426 | * the helpers to get the task's different pids as they are seen | |
1427 | * from various namespaces | |
1428 | * | |
1429 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1430 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1431 | * current. | |
7af57294 PE |
1432 | * task_xid_nr_ns() : id seen from the ns specified; |
1433 | * | |
7af57294 PE |
1434 | * see also pid_nr() etc in include/linux/pid.h |
1435 | */ | |
5eca1c10 | 1436 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns); |
7af57294 | 1437 | |
e868171a | 1438 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1439 | { |
1440 | return tsk->pid; | |
1441 | } | |
1442 | ||
5eca1c10 | 1443 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
52ee2dfd ON |
1444 | { |
1445 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1446 | } | |
7af57294 PE |
1447 | |
1448 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1449 | { | |
52ee2dfd | 1450 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1451 | } |
1452 | ||
1453 | ||
e868171a | 1454 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1455 | { |
1456 | return tsk->tgid; | |
1457 | } | |
1458 | ||
5eca1c10 IM |
1459 | /** |
1460 | * pid_alive - check that a task structure is not stale | |
1461 | * @p: Task structure to be checked. | |
1462 | * | |
1463 | * Test if a process is not yet dead (at most zombie state) | |
1464 | * If pid_alive fails, then pointers within the task structure | |
1465 | * can be stale and must not be dereferenced. | |
1466 | * | |
1467 | * Return: 1 if the process is alive. 0 otherwise. | |
1468 | */ | |
1469 | static inline int pid_alive(const struct task_struct *p) | |
1470 | { | |
2c470475 | 1471 | return p->thread_pid != NULL; |
5eca1c10 | 1472 | } |
7af57294 | 1473 | |
5eca1c10 | 1474 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
7af57294 | 1475 | { |
52ee2dfd | 1476 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1477 | } |
1478 | ||
7af57294 PE |
1479 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1480 | { | |
52ee2dfd | 1481 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1482 | } |
1483 | ||
1484 | ||
5eca1c10 | 1485 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
7af57294 | 1486 | { |
52ee2dfd | 1487 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1488 | } |
1489 | ||
7af57294 PE |
1490 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1491 | { | |
52ee2dfd | 1492 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1493 | } |
1494 | ||
dd1c1f2f ON |
1495 | static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
1496 | { | |
6883f81a | 1497 | return __task_pid_nr_ns(tsk, PIDTYPE_TGID, ns); |
dd1c1f2f ON |
1498 | } |
1499 | ||
1500 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1501 | { | |
6883f81a | 1502 | return __task_pid_nr_ns(tsk, PIDTYPE_TGID, NULL); |
dd1c1f2f ON |
1503 | } |
1504 | ||
1505 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) | |
1506 | { | |
1507 | pid_t pid = 0; | |
1508 | ||
1509 | rcu_read_lock(); | |
1510 | if (pid_alive(tsk)) | |
1511 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1512 | rcu_read_unlock(); | |
1513 | ||
1514 | return pid; | |
1515 | } | |
1516 | ||
1517 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1518 | { | |
1519 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1520 | } | |
1521 | ||
5eca1c10 | 1522 | /* Obsolete, do not use: */ |
1b0f7ffd ON |
1523 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) |
1524 | { | |
1525 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1526 | } | |
7af57294 | 1527 | |
06eb6184 PZ |
1528 | #define TASK_REPORT_IDLE (TASK_REPORT + 1) |
1529 | #define TASK_REPORT_MAX (TASK_REPORT_IDLE << 1) | |
1530 | ||
1d48b080 | 1531 | static inline unsigned int task_state_index(struct task_struct *tsk) |
20435d84 | 1532 | { |
2f064a59 | 1533 | unsigned int tsk_state = READ_ONCE(tsk->__state); |
1593baab | 1534 | unsigned int state = (tsk_state | tsk->exit_state) & TASK_REPORT; |
20435d84 | 1535 | |
06eb6184 PZ |
1536 | BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX); |
1537 | ||
06eb6184 PZ |
1538 | if (tsk_state == TASK_IDLE) |
1539 | state = TASK_REPORT_IDLE; | |
1540 | ||
1593baab PZ |
1541 | return fls(state); |
1542 | } | |
1543 | ||
1d48b080 | 1544 | static inline char task_index_to_char(unsigned int state) |
1593baab | 1545 | { |
8ef9925b | 1546 | static const char state_char[] = "RSDTtXZPI"; |
1593baab | 1547 | |
06eb6184 | 1548 | BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1); |
20435d84 | 1549 | |
1593baab PZ |
1550 | return state_char[state]; |
1551 | } | |
1552 | ||
1553 | static inline char task_state_to_char(struct task_struct *tsk) | |
1554 | { | |
1d48b080 | 1555 | return task_index_to_char(task_state_index(tsk)); |
20435d84 XX |
1556 | } |
1557 | ||
f400e198 | 1558 | /** |
570f5241 SS |
1559 | * is_global_init - check if a task structure is init. Since init |
1560 | * is free to have sub-threads we need to check tgid. | |
3260259f H |
1561 | * @tsk: Task structure to be checked. |
1562 | * | |
1563 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1564 | * |
1565 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1566 | */ |
e868171a | 1567 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 | 1568 | { |
570f5241 | 1569 | return task_tgid_nr(tsk) == 1; |
b461cc03 | 1570 | } |
b460cbc5 | 1571 | |
9ec52099 CLG |
1572 | extern struct pid *cad_pid; |
1573 | ||
1da177e4 LT |
1574 | /* |
1575 | * Per process flags | |
1576 | */ | |
01ccf592 | 1577 | #define PF_VCPU 0x00000001 /* I'm a virtual CPU */ |
5eca1c10 IM |
1578 | #define PF_IDLE 0x00000002 /* I am an IDLE thread */ |
1579 | #define PF_EXITING 0x00000004 /* Getting shut down */ | |
01ccf592 | 1580 | #define PF_IO_WORKER 0x00000010 /* Task is an IO worker */ |
5eca1c10 IM |
1581 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1582 | #define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */ | |
1583 | #define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */ | |
1584 | #define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */ | |
1585 | #define PF_DUMPCORE 0x00000200 /* Dumped core */ | |
1586 | #define PF_SIGNALED 0x00000400 /* Killed by a signal */ | |
1587 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1588 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */ | |
1589 | #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */ | |
1590 | #define PF_USED_ASYNC 0x00004000 /* Used async_schedule*(), used by module init */ | |
1591 | #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */ | |
1592 | #define PF_FROZEN 0x00010000 /* Frozen for system suspend */ | |
7dea19f9 MH |
1593 | #define PF_KSWAPD 0x00020000 /* I am kswapd */ |
1594 | #define PF_MEMALLOC_NOFS 0x00040000 /* All allocation requests will inherit GFP_NOFS */ | |
1595 | #define PF_MEMALLOC_NOIO 0x00080000 /* All allocation requests will inherit GFP_NOIO */ | |
a37b0715 N |
1596 | #define PF_LOCAL_THROTTLE 0x00100000 /* Throttle writes only against the bdi I write to, |
1597 | * I am cleaning dirty pages from some other bdi. */ | |
5eca1c10 IM |
1598 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
1599 | #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */ | |
1600 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
3bd37062 | 1601 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */ |
5eca1c10 | 1602 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
1a08ae36 | 1603 | #define PF_MEMALLOC_PIN 0x10000000 /* Allocation context constrained to zones which allow long term pinning. */ |
5eca1c10 IM |
1604 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
1605 | #define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */ | |
1da177e4 LT |
1606 | |
1607 | /* | |
1608 | * Only the _current_ task can read/write to tsk->flags, but other | |
1609 | * tasks can access tsk->flags in readonly mode for example | |
1610 | * with tsk_used_math (like during threaded core dumping). | |
1611 | * There is however an exception to this rule during ptrace | |
1612 | * or during fork: the ptracer task is allowed to write to the | |
1613 | * child->flags of its traced child (same goes for fork, the parent | |
1614 | * can write to the child->flags), because we're guaranteed the | |
1615 | * child is not running and in turn not changing child->flags | |
1616 | * at the same time the parent does it. | |
1617 | */ | |
5eca1c10 IM |
1618 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) |
1619 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1620 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1621 | #define set_used_math() set_stopped_child_used_math(current) | |
1622 | ||
1da177e4 LT |
1623 | #define conditional_stopped_child_used_math(condition, child) \ |
1624 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
5eca1c10 IM |
1625 | |
1626 | #define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current) | |
1627 | ||
1da177e4 LT |
1628 | #define copy_to_stopped_child_used_math(child) \ |
1629 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
5eca1c10 | 1630 | |
1da177e4 | 1631 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ |
5eca1c10 IM |
1632 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) |
1633 | #define used_math() tsk_used_math(current) | |
1da177e4 | 1634 | |
62ec05dd TG |
1635 | static inline bool is_percpu_thread(void) |
1636 | { | |
1637 | #ifdef CONFIG_SMP | |
1638 | return (current->flags & PF_NO_SETAFFINITY) && | |
1639 | (current->nr_cpus_allowed == 1); | |
1640 | #else | |
1641 | return true; | |
1642 | #endif | |
1643 | } | |
1644 | ||
1d4457f9 | 1645 | /* Per-process atomic flags. */ |
5eca1c10 IM |
1646 | #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ |
1647 | #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ | |
1648 | #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ | |
356e4bff TG |
1649 | #define PFA_SPEC_SSB_DISABLE 3 /* Speculative Store Bypass disabled */ |
1650 | #define PFA_SPEC_SSB_FORCE_DISABLE 4 /* Speculative Store Bypass force disabled*/ | |
9137bb27 TG |
1651 | #define PFA_SPEC_IB_DISABLE 5 /* Indirect branch speculation restricted */ |
1652 | #define PFA_SPEC_IB_FORCE_DISABLE 6 /* Indirect branch speculation permanently restricted */ | |
71368af9 | 1653 | #define PFA_SPEC_SSB_NOEXEC 7 /* Speculative Store Bypass clear on execve() */ |
1d4457f9 | 1654 | |
e0e5070b ZL |
1655 | #define TASK_PFA_TEST(name, func) \ |
1656 | static inline bool task_##func(struct task_struct *p) \ | |
1657 | { return test_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1658 | |
e0e5070b ZL |
1659 | #define TASK_PFA_SET(name, func) \ |
1660 | static inline void task_set_##func(struct task_struct *p) \ | |
1661 | { set_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1662 | |
e0e5070b ZL |
1663 | #define TASK_PFA_CLEAR(name, func) \ |
1664 | static inline void task_clear_##func(struct task_struct *p) \ | |
1665 | { clear_bit(PFA_##name, &p->atomic_flags); } | |
1666 | ||
1667 | TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) | |
1668 | TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) | |
1d4457f9 | 1669 | |
2ad654bc ZL |
1670 | TASK_PFA_TEST(SPREAD_PAGE, spread_page) |
1671 | TASK_PFA_SET(SPREAD_PAGE, spread_page) | |
1672 | TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) | |
1673 | ||
1674 | TASK_PFA_TEST(SPREAD_SLAB, spread_slab) | |
1675 | TASK_PFA_SET(SPREAD_SLAB, spread_slab) | |
1676 | TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) | |
1d4457f9 | 1677 | |
356e4bff TG |
1678 | TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable) |
1679 | TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable) | |
1680 | TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable) | |
1681 | ||
71368af9 WL |
1682 | TASK_PFA_TEST(SPEC_SSB_NOEXEC, spec_ssb_noexec) |
1683 | TASK_PFA_SET(SPEC_SSB_NOEXEC, spec_ssb_noexec) | |
1684 | TASK_PFA_CLEAR(SPEC_SSB_NOEXEC, spec_ssb_noexec) | |
1685 | ||
356e4bff TG |
1686 | TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) |
1687 | TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) | |
1688 | ||
9137bb27 TG |
1689 | TASK_PFA_TEST(SPEC_IB_DISABLE, spec_ib_disable) |
1690 | TASK_PFA_SET(SPEC_IB_DISABLE, spec_ib_disable) | |
1691 | TASK_PFA_CLEAR(SPEC_IB_DISABLE, spec_ib_disable) | |
1692 | ||
1693 | TASK_PFA_TEST(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable) | |
1694 | TASK_PFA_SET(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable) | |
1695 | ||
5eca1c10 | 1696 | static inline void |
717a94b5 | 1697 | current_restore_flags(unsigned long orig_flags, unsigned long flags) |
907aed48 | 1698 | { |
717a94b5 N |
1699 | current->flags &= ~flags; |
1700 | current->flags |= orig_flags & flags; | |
907aed48 MG |
1701 | } |
1702 | ||
5eca1c10 IM |
1703 | extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial); |
1704 | extern int task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed); | |
1da177e4 | 1705 | #ifdef CONFIG_SMP |
5eca1c10 IM |
1706 | extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask); |
1707 | extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask); | |
1da177e4 | 1708 | #else |
5eca1c10 | 1709 | static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) |
1e1b6c51 KM |
1710 | { |
1711 | } | |
5eca1c10 | 1712 | static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask) |
1da177e4 | 1713 | { |
96f874e2 | 1714 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1715 | return -EINVAL; |
1716 | return 0; | |
1717 | } | |
1718 | #endif | |
e0ad9556 | 1719 | |
fa93384f | 1720 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
1721 | extern void set_user_nice(struct task_struct *p, long nice); |
1722 | extern int task_prio(const struct task_struct *p); | |
5eca1c10 | 1723 | |
d0ea0268 DY |
1724 | /** |
1725 | * task_nice - return the nice value of a given task. | |
1726 | * @p: the task in question. | |
1727 | * | |
1728 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
1729 | */ | |
1730 | static inline int task_nice(const struct task_struct *p) | |
1731 | { | |
1732 | return PRIO_TO_NICE((p)->static_prio); | |
1733 | } | |
5eca1c10 | 1734 | |
36c8b586 IM |
1735 | extern int can_nice(const struct task_struct *p, const int nice); |
1736 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 1737 | extern int idle_cpu(int cpu); |
943d355d | 1738 | extern int available_idle_cpu(int cpu); |
5eca1c10 IM |
1739 | extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *); |
1740 | extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *); | |
8b700983 PZ |
1741 | extern void sched_set_fifo(struct task_struct *p); |
1742 | extern void sched_set_fifo_low(struct task_struct *p); | |
1743 | extern void sched_set_normal(struct task_struct *p, int nice); | |
5eca1c10 | 1744 | extern int sched_setattr(struct task_struct *, const struct sched_attr *); |
794a56eb | 1745 | extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *); |
36c8b586 | 1746 | extern struct task_struct *idle_task(int cpu); |
5eca1c10 | 1747 | |
c4f30608 PM |
1748 | /** |
1749 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 1750 | * @p: the task in question. |
e69f6186 YB |
1751 | * |
1752 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 1753 | */ |
c94a88f3 | 1754 | static __always_inline bool is_idle_task(const struct task_struct *p) |
c4f30608 | 1755 | { |
c1de45ca | 1756 | return !!(p->flags & PF_IDLE); |
c4f30608 | 1757 | } |
5eca1c10 | 1758 | |
36c8b586 | 1759 | extern struct task_struct *curr_task(int cpu); |
a458ae2e | 1760 | extern void ia64_set_curr_task(int cpu, struct task_struct *p); |
1da177e4 LT |
1761 | |
1762 | void yield(void); | |
1763 | ||
1da177e4 | 1764 | union thread_union { |
0500871f DH |
1765 | #ifndef CONFIG_ARCH_TASK_STRUCT_ON_STACK |
1766 | struct task_struct task; | |
1767 | #endif | |
c65eacbe | 1768 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1da177e4 | 1769 | struct thread_info thread_info; |
c65eacbe | 1770 | #endif |
1da177e4 LT |
1771 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
1772 | }; | |
1773 | ||
0500871f DH |
1774 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1775 | extern struct thread_info init_thread_info; | |
1776 | #endif | |
1777 | ||
1778 | extern unsigned long init_stack[THREAD_SIZE / sizeof(unsigned long)]; | |
1779 | ||
f3ac6067 IM |
1780 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
1781 | static inline struct thread_info *task_thread_info(struct task_struct *task) | |
1782 | { | |
1783 | return &task->thread_info; | |
1784 | } | |
1785 | #elif !defined(__HAVE_THREAD_FUNCTIONS) | |
1786 | # define task_thread_info(task) ((struct thread_info *)(task)->stack) | |
1787 | #endif | |
1788 | ||
198fe21b PE |
1789 | /* |
1790 | * find a task by one of its numerical ids | |
1791 | * | |
198fe21b PE |
1792 | * find_task_by_pid_ns(): |
1793 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1794 | * find_task_by_vpid(): |
1795 | * finds a task by its virtual pid | |
198fe21b | 1796 | * |
e49859e7 | 1797 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
1798 | */ |
1799 | ||
228ebcbe | 1800 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
5eca1c10 | 1801 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns); |
198fe21b | 1802 | |
2ee08260 MR |
1803 | /* |
1804 | * find a task by its virtual pid and get the task struct | |
1805 | */ | |
1806 | extern struct task_struct *find_get_task_by_vpid(pid_t nr); | |
1807 | ||
b3c97528 HH |
1808 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
1809 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 1810 | extern void wake_up_new_task(struct task_struct *tsk); |
5eca1c10 | 1811 | |
1da177e4 | 1812 | #ifdef CONFIG_SMP |
5eca1c10 | 1813 | extern void kick_process(struct task_struct *tsk); |
1da177e4 | 1814 | #else |
5eca1c10 | 1815 | static inline void kick_process(struct task_struct *tsk) { } |
1da177e4 | 1816 | #endif |
1da177e4 | 1817 | |
82b89778 | 1818 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
5eca1c10 | 1819 | |
82b89778 AH |
1820 | static inline void set_task_comm(struct task_struct *tsk, const char *from) |
1821 | { | |
1822 | __set_task_comm(tsk, from, false); | |
1823 | } | |
5eca1c10 | 1824 | |
3756f640 AB |
1825 | extern char *__get_task_comm(char *to, size_t len, struct task_struct *tsk); |
1826 | #define get_task_comm(buf, tsk) ({ \ | |
1827 | BUILD_BUG_ON(sizeof(buf) != TASK_COMM_LEN); \ | |
1828 | __get_task_comm(buf, sizeof(buf), tsk); \ | |
1829 | }) | |
1da177e4 LT |
1830 | |
1831 | #ifdef CONFIG_SMP | |
2a0a24eb TG |
1832 | static __always_inline void scheduler_ipi(void) |
1833 | { | |
1834 | /* | |
1835 | * Fold TIF_NEED_RESCHED into the preempt_count; anybody setting | |
1836 | * TIF_NEED_RESCHED remotely (for the first time) will also send | |
1837 | * this IPI. | |
1838 | */ | |
1839 | preempt_fold_need_resched(); | |
1840 | } | |
2f064a59 | 1841 | extern unsigned long wait_task_inactive(struct task_struct *, unsigned int match_state); |
1da177e4 | 1842 | #else |
184748cc | 1843 | static inline void scheduler_ipi(void) { } |
2f064a59 | 1844 | static inline unsigned long wait_task_inactive(struct task_struct *p, unsigned int match_state) |
85ba2d86 RM |
1845 | { |
1846 | return 1; | |
1847 | } | |
1da177e4 LT |
1848 | #endif |
1849 | ||
5eca1c10 IM |
1850 | /* |
1851 | * Set thread flags in other task's structures. | |
1852 | * See asm/thread_info.h for TIF_xxxx flags available: | |
1da177e4 LT |
1853 | */ |
1854 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1855 | { | |
a1261f54 | 1856 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1857 | } |
1858 | ||
1859 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1860 | { | |
a1261f54 | 1861 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1862 | } |
1863 | ||
93ee37c2 DM |
1864 | static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag, |
1865 | bool value) | |
1866 | { | |
1867 | update_ti_thread_flag(task_thread_info(tsk), flag, value); | |
1868 | } | |
1869 | ||
1da177e4 LT |
1870 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
1871 | { | |
a1261f54 | 1872 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1873 | } |
1874 | ||
1875 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1876 | { | |
a1261f54 | 1877 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1878 | } |
1879 | ||
1880 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1881 | { | |
a1261f54 | 1882 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1883 | } |
1884 | ||
1885 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
1886 | { | |
1887 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1888 | } | |
1889 | ||
1890 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
1891 | { | |
1892 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1893 | } | |
1894 | ||
8ae121ac GH |
1895 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
1896 | { | |
1897 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
1898 | } | |
1899 | ||
1da177e4 LT |
1900 | /* |
1901 | * cond_resched() and cond_resched_lock(): latency reduction via | |
1902 | * explicit rescheduling in places that are safe. The return | |
1903 | * value indicates whether a reschedule was done in fact. | |
1904 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1da177e4 | 1905 | */ |
b965f1dd PZI |
1906 | #if !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC) |
1907 | extern int __cond_resched(void); | |
1908 | ||
1909 | #ifdef CONFIG_PREEMPT_DYNAMIC | |
1910 | ||
1911 | DECLARE_STATIC_CALL(cond_resched, __cond_resched); | |
1912 | ||
1913 | static __always_inline int _cond_resched(void) | |
1914 | { | |
ef72661e | 1915 | return static_call_mod(cond_resched)(); |
b965f1dd PZI |
1916 | } |
1917 | ||
35a773a0 | 1918 | #else |
b965f1dd PZI |
1919 | |
1920 | static inline int _cond_resched(void) | |
1921 | { | |
1922 | return __cond_resched(); | |
1923 | } | |
1924 | ||
1925 | #endif /* CONFIG_PREEMPT_DYNAMIC */ | |
1926 | ||
1927 | #else | |
1928 | ||
35a773a0 | 1929 | static inline int _cond_resched(void) { return 0; } |
b965f1dd PZI |
1930 | |
1931 | #endif /* !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC) */ | |
6f80bd98 | 1932 | |
613afbf8 | 1933 | #define cond_resched() ({ \ |
3427445a | 1934 | ___might_sleep(__FILE__, __LINE__, 0); \ |
613afbf8 FW |
1935 | _cond_resched(); \ |
1936 | }) | |
6f80bd98 | 1937 | |
613afbf8 | 1938 | extern int __cond_resched_lock(spinlock_t *lock); |
f3d4b4b1 BG |
1939 | extern int __cond_resched_rwlock_read(rwlock_t *lock); |
1940 | extern int __cond_resched_rwlock_write(rwlock_t *lock); | |
613afbf8 FW |
1941 | |
1942 | #define cond_resched_lock(lock) ({ \ | |
3427445a | 1943 | ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\ |
613afbf8 FW |
1944 | __cond_resched_lock(lock); \ |
1945 | }) | |
1946 | ||
f3d4b4b1 BG |
1947 | #define cond_resched_rwlock_read(lock) ({ \ |
1948 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ | |
1949 | __cond_resched_rwlock_read(lock); \ | |
1950 | }) | |
1951 | ||
1952 | #define cond_resched_rwlock_write(lock) ({ \ | |
1953 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ | |
1954 | __cond_resched_rwlock_write(lock); \ | |
1955 | }) | |
1956 | ||
f6f3c437 SH |
1957 | static inline void cond_resched_rcu(void) |
1958 | { | |
1959 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
1960 | rcu_read_unlock(); | |
1961 | cond_resched(); | |
1962 | rcu_read_lock(); | |
1963 | #endif | |
1964 | } | |
1965 | ||
1da177e4 LT |
1966 | /* |
1967 | * Does a critical section need to be broken due to another | |
c1a280b6 | 1968 | * task waiting?: (technically does not depend on CONFIG_PREEMPTION, |
95c354fe | 1969 | * but a general need for low latency) |
1da177e4 | 1970 | */ |
95c354fe | 1971 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 1972 | { |
c1a280b6 | 1973 | #ifdef CONFIG_PREEMPTION |
95c354fe NP |
1974 | return spin_is_contended(lock); |
1975 | #else | |
1da177e4 | 1976 | return 0; |
95c354fe | 1977 | #endif |
1da177e4 LT |
1978 | } |
1979 | ||
a09a689a BG |
1980 | /* |
1981 | * Check if a rwlock is contended. | |
1982 | * Returns non-zero if there is another task waiting on the rwlock. | |
1983 | * Returns zero if the lock is not contended or the system / underlying | |
1984 | * rwlock implementation does not support contention detection. | |
1985 | * Technically does not depend on CONFIG_PREEMPTION, but a general need | |
1986 | * for low latency. | |
1987 | */ | |
1988 | static inline int rwlock_needbreak(rwlock_t *lock) | |
1989 | { | |
1990 | #ifdef CONFIG_PREEMPTION | |
1991 | return rwlock_is_contended(lock); | |
1992 | #else | |
1993 | return 0; | |
1994 | #endif | |
1995 | } | |
1996 | ||
75f93fed PZ |
1997 | static __always_inline bool need_resched(void) |
1998 | { | |
1999 | return unlikely(tif_need_resched()); | |
2000 | } | |
2001 | ||
1da177e4 LT |
2002 | /* |
2003 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2004 | */ | |
2005 | #ifdef CONFIG_SMP | |
2006 | ||
2007 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2008 | { | |
c65eacbe | 2009 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
c546951d | 2010 | return READ_ONCE(p->cpu); |
c65eacbe | 2011 | #else |
c546951d | 2012 | return READ_ONCE(task_thread_info(p)->cpu); |
c65eacbe | 2013 | #endif |
1da177e4 LT |
2014 | } |
2015 | ||
c65cc870 | 2016 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2017 | |
2018 | #else | |
2019 | ||
2020 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2021 | { | |
2022 | return 0; | |
2023 | } | |
2024 | ||
2025 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2026 | { | |
2027 | } | |
2028 | ||
2029 | #endif /* CONFIG_SMP */ | |
2030 | ||
a1dfb631 MT |
2031 | extern bool sched_task_on_rq(struct task_struct *p); |
2032 | ||
d9345c65 PX |
2033 | /* |
2034 | * In order to reduce various lock holder preemption latencies provide an | |
2035 | * interface to see if a vCPU is currently running or not. | |
2036 | * | |
2037 | * This allows us to terminate optimistic spin loops and block, analogous to | |
2038 | * the native optimistic spin heuristic of testing if the lock owner task is | |
2039 | * running or not. | |
2040 | */ | |
2041 | #ifndef vcpu_is_preempted | |
42fd8baa QC |
2042 | static inline bool vcpu_is_preempted(int cpu) |
2043 | { | |
2044 | return false; | |
2045 | } | |
d9345c65 PX |
2046 | #endif |
2047 | ||
96f874e2 RR |
2048 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2049 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2050 | |
82455257 DH |
2051 | #ifndef TASK_SIZE_OF |
2052 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2053 | #endif | |
2054 | ||
a5418be9 VK |
2055 | #ifdef CONFIG_SMP |
2056 | /* Returns effective CPU energy utilization, as seen by the scheduler */ | |
2057 | unsigned long sched_cpu_util(int cpu, unsigned long max); | |
2058 | #endif /* CONFIG_SMP */ | |
2059 | ||
d7822b1e MD |
2060 | #ifdef CONFIG_RSEQ |
2061 | ||
2062 | /* | |
2063 | * Map the event mask on the user-space ABI enum rseq_cs_flags | |
2064 | * for direct mask checks. | |
2065 | */ | |
2066 | enum rseq_event_mask_bits { | |
2067 | RSEQ_EVENT_PREEMPT_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT, | |
2068 | RSEQ_EVENT_SIGNAL_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT, | |
2069 | RSEQ_EVENT_MIGRATE_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT, | |
2070 | }; | |
2071 | ||
2072 | enum rseq_event_mask { | |
2073 | RSEQ_EVENT_PREEMPT = (1U << RSEQ_EVENT_PREEMPT_BIT), | |
2074 | RSEQ_EVENT_SIGNAL = (1U << RSEQ_EVENT_SIGNAL_BIT), | |
2075 | RSEQ_EVENT_MIGRATE = (1U << RSEQ_EVENT_MIGRATE_BIT), | |
2076 | }; | |
2077 | ||
2078 | static inline void rseq_set_notify_resume(struct task_struct *t) | |
2079 | { | |
2080 | if (t->rseq) | |
2081 | set_tsk_thread_flag(t, TIF_NOTIFY_RESUME); | |
2082 | } | |
2083 | ||
784e0300 | 2084 | void __rseq_handle_notify_resume(struct ksignal *sig, struct pt_regs *regs); |
d7822b1e | 2085 | |
784e0300 WD |
2086 | static inline void rseq_handle_notify_resume(struct ksignal *ksig, |
2087 | struct pt_regs *regs) | |
d7822b1e MD |
2088 | { |
2089 | if (current->rseq) | |
784e0300 | 2090 | __rseq_handle_notify_resume(ksig, regs); |
d7822b1e MD |
2091 | } |
2092 | ||
784e0300 WD |
2093 | static inline void rseq_signal_deliver(struct ksignal *ksig, |
2094 | struct pt_regs *regs) | |
d7822b1e MD |
2095 | { |
2096 | preempt_disable(); | |
2097 | __set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask); | |
2098 | preempt_enable(); | |
784e0300 | 2099 | rseq_handle_notify_resume(ksig, regs); |
d7822b1e MD |
2100 | } |
2101 | ||
2102 | /* rseq_preempt() requires preemption to be disabled. */ | |
2103 | static inline void rseq_preempt(struct task_struct *t) | |
2104 | { | |
2105 | __set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask); | |
2106 | rseq_set_notify_resume(t); | |
2107 | } | |
2108 | ||
2109 | /* rseq_migrate() requires preemption to be disabled. */ | |
2110 | static inline void rseq_migrate(struct task_struct *t) | |
2111 | { | |
2112 | __set_bit(RSEQ_EVENT_MIGRATE_BIT, &t->rseq_event_mask); | |
2113 | rseq_set_notify_resume(t); | |
2114 | } | |
2115 | ||
2116 | /* | |
2117 | * If parent process has a registered restartable sequences area, the | |
463f550f | 2118 | * child inherits. Unregister rseq for a clone with CLONE_VM set. |
d7822b1e MD |
2119 | */ |
2120 | static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) | |
2121 | { | |
463f550f | 2122 | if (clone_flags & CLONE_VM) { |
d7822b1e | 2123 | t->rseq = NULL; |
d7822b1e MD |
2124 | t->rseq_sig = 0; |
2125 | t->rseq_event_mask = 0; | |
2126 | } else { | |
2127 | t->rseq = current->rseq; | |
d7822b1e MD |
2128 | t->rseq_sig = current->rseq_sig; |
2129 | t->rseq_event_mask = current->rseq_event_mask; | |
d7822b1e MD |
2130 | } |
2131 | } | |
2132 | ||
2133 | static inline void rseq_execve(struct task_struct *t) | |
2134 | { | |
2135 | t->rseq = NULL; | |
d7822b1e MD |
2136 | t->rseq_sig = 0; |
2137 | t->rseq_event_mask = 0; | |
2138 | } | |
2139 | ||
2140 | #else | |
2141 | ||
2142 | static inline void rseq_set_notify_resume(struct task_struct *t) | |
2143 | { | |
2144 | } | |
784e0300 WD |
2145 | static inline void rseq_handle_notify_resume(struct ksignal *ksig, |
2146 | struct pt_regs *regs) | |
d7822b1e MD |
2147 | { |
2148 | } | |
784e0300 WD |
2149 | static inline void rseq_signal_deliver(struct ksignal *ksig, |
2150 | struct pt_regs *regs) | |
d7822b1e MD |
2151 | { |
2152 | } | |
2153 | static inline void rseq_preempt(struct task_struct *t) | |
2154 | { | |
2155 | } | |
2156 | static inline void rseq_migrate(struct task_struct *t) | |
2157 | { | |
2158 | } | |
2159 | static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) | |
2160 | { | |
2161 | } | |
2162 | static inline void rseq_execve(struct task_struct *t) | |
2163 | { | |
2164 | } | |
2165 | ||
2166 | #endif | |
2167 | ||
2168 | #ifdef CONFIG_DEBUG_RSEQ | |
2169 | ||
2170 | void rseq_syscall(struct pt_regs *regs); | |
2171 | ||
2172 | #else | |
2173 | ||
2174 | static inline void rseq_syscall(struct pt_regs *regs) | |
2175 | { | |
2176 | } | |
2177 | ||
2178 | #endif | |
2179 | ||
3c93a0c0 QY |
2180 | const struct sched_avg *sched_trace_cfs_rq_avg(struct cfs_rq *cfs_rq); |
2181 | char *sched_trace_cfs_rq_path(struct cfs_rq *cfs_rq, char *str, int len); | |
2182 | int sched_trace_cfs_rq_cpu(struct cfs_rq *cfs_rq); | |
2183 | ||
2184 | const struct sched_avg *sched_trace_rq_avg_rt(struct rq *rq); | |
2185 | const struct sched_avg *sched_trace_rq_avg_dl(struct rq *rq); | |
2186 | const struct sched_avg *sched_trace_rq_avg_irq(struct rq *rq); | |
2187 | ||
2188 | int sched_trace_rq_cpu(struct rq *rq); | |
51cf18c9 | 2189 | int sched_trace_rq_cpu_capacity(struct rq *rq); |
9d246053 | 2190 | int sched_trace_rq_nr_running(struct rq *rq); |
3c93a0c0 QY |
2191 | |
2192 | const struct cpumask *sched_trace_rd_span(struct root_domain *rd); | |
2193 | ||
6e33cad0 PZ |
2194 | #ifdef CONFIG_SCHED_CORE |
2195 | extern void sched_core_free(struct task_struct *tsk); | |
85dd3f61 | 2196 | extern void sched_core_fork(struct task_struct *p); |
7ac592aa CH |
2197 | extern int sched_core_share_pid(unsigned int cmd, pid_t pid, enum pid_type type, |
2198 | unsigned long uaddr); | |
6e33cad0 PZ |
2199 | #else |
2200 | static inline void sched_core_free(struct task_struct *tsk) { } | |
85dd3f61 | 2201 | static inline void sched_core_fork(struct task_struct *p) { } |
6e33cad0 PZ |
2202 | #endif |
2203 | ||
1da177e4 | 2204 | #endif |