Commit | Line | Data |
---|---|---|
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; |
c7603cfa | 45 | struct bpf_run_ctx; |
3c93a0c0 | 46 | struct capture_control; |
c7af7877 | 47 | struct cfs_rq; |
c7af7877 IM |
48 | struct fs_struct; |
49 | struct futex_pi_state; | |
50 | struct io_context; | |
1875dc5b | 51 | struct io_uring_task; |
c7af7877 | 52 | struct mempolicy; |
89076bc3 | 53 | struct nameidata; |
c7af7877 IM |
54 | struct nsproxy; |
55 | struct perf_event_context; | |
56 | struct pid_namespace; | |
57 | struct pipe_inode_info; | |
58 | struct rcu_node; | |
59 | struct reclaim_state; | |
60 | struct robust_list_head; | |
3c93a0c0 QY |
61 | struct root_domain; |
62 | struct rq; | |
c7af7877 IM |
63 | struct sched_attr; |
64 | struct sched_param; | |
43ae34cb | 65 | struct seq_file; |
c7af7877 IM |
66 | struct sighand_struct; |
67 | struct signal_struct; | |
68 | struct task_delay_info; | |
4cf86d77 | 69 | struct task_group; |
1da177e4 | 70 | |
4a8342d2 LT |
71 | /* |
72 | * Task state bitmask. NOTE! These bits are also | |
73 | * encoded in fs/proc/array.c: get_task_state(). | |
74 | * | |
75 | * We have two separate sets of flags: task->state | |
76 | * is about runnability, while task->exit_state are | |
77 | * about the task exiting. Confusing, but this way | |
78 | * modifying one set can't modify the other one by | |
79 | * mistake. | |
80 | */ | |
5eca1c10 IM |
81 | |
82 | /* Used in tsk->state: */ | |
92c4bc9f PZ |
83 | #define TASK_RUNNING 0x0000 |
84 | #define TASK_INTERRUPTIBLE 0x0001 | |
85 | #define TASK_UNINTERRUPTIBLE 0x0002 | |
86 | #define __TASK_STOPPED 0x0004 | |
87 | #define __TASK_TRACED 0x0008 | |
5eca1c10 | 88 | /* Used in tsk->exit_state: */ |
92c4bc9f PZ |
89 | #define EXIT_DEAD 0x0010 |
90 | #define EXIT_ZOMBIE 0x0020 | |
5eca1c10 IM |
91 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) |
92 | /* Used in tsk->state again: */ | |
8ef9925b PZ |
93 | #define TASK_PARKED 0x0040 |
94 | #define TASK_DEAD 0x0080 | |
95 | #define TASK_WAKEKILL 0x0100 | |
96 | #define TASK_WAKING 0x0200 | |
92c4bc9f PZ |
97 | #define TASK_NOLOAD 0x0400 |
98 | #define TASK_NEW 0x0800 | |
cd781d0c TG |
99 | /* RT specific auxilliary flag to mark RT lock waiters */ |
100 | #define TASK_RTLOCK_WAIT 0x1000 | |
101 | #define TASK_STATE_MAX 0x2000 | |
5eca1c10 | 102 | |
5eca1c10 IM |
103 | /* Convenience macros for the sake of set_current_state: */ |
104 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
105 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
106 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
107 | ||
108 | #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD) | |
109 | ||
110 | /* Convenience macros for the sake of wake_up(): */ | |
111 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
5eca1c10 IM |
112 | |
113 | /* get_task_state(): */ | |
114 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
115 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ | |
8ef9925b PZ |
116 | __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \ |
117 | TASK_PARKED) | |
5eca1c10 | 118 | |
2f064a59 | 119 | #define task_is_running(task) (READ_ONCE((task)->__state) == TASK_RUNNING) |
5eca1c10 | 120 | |
2f064a59 | 121 | #define task_is_traced(task) ((READ_ONCE(task->__state) & __TASK_TRACED) != 0) |
5eca1c10 | 122 | |
2f064a59 | 123 | #define task_is_stopped(task) ((READ_ONCE(task->__state) & __TASK_STOPPED) != 0) |
5eca1c10 | 124 | |
2f064a59 | 125 | #define task_is_stopped_or_traced(task) ((READ_ONCE(task->__state) & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
5eca1c10 | 126 | |
b5bf9a90 PZ |
127 | /* |
128 | * Special states are those that do not use the normal wait-loop pattern. See | |
129 | * the comment with set_special_state(). | |
130 | */ | |
131 | #define is_special_task_state(state) \ | |
1cef1150 | 132 | ((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD)) |
b5bf9a90 | 133 | |
85019c16 TG |
134 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
135 | # define debug_normal_state_change(state_value) \ | |
136 | do { \ | |
137 | WARN_ON_ONCE(is_special_task_state(state_value)); \ | |
138 | current->task_state_change = _THIS_IP_; \ | |
8eb23b9f PZ |
139 | } while (0) |
140 | ||
85019c16 | 141 | # define debug_special_state_change(state_value) \ |
b5bf9a90 | 142 | do { \ |
b5bf9a90 | 143 | WARN_ON_ONCE(!is_special_task_state(state_value)); \ |
b5bf9a90 | 144 | current->task_state_change = _THIS_IP_; \ |
b5bf9a90 | 145 | } while (0) |
85019c16 | 146 | |
5f220be2 TG |
147 | # define debug_rtlock_wait_set_state() \ |
148 | do { \ | |
149 | current->saved_state_change = current->task_state_change;\ | |
150 | current->task_state_change = _THIS_IP_; \ | |
151 | } while (0) | |
152 | ||
153 | # define debug_rtlock_wait_restore_state() \ | |
154 | do { \ | |
155 | current->task_state_change = current->saved_state_change;\ | |
156 | } while (0) | |
157 | ||
8eb23b9f | 158 | #else |
85019c16 TG |
159 | # define debug_normal_state_change(cond) do { } while (0) |
160 | # define debug_special_state_change(cond) do { } while (0) | |
5f220be2 TG |
161 | # define debug_rtlock_wait_set_state() do { } while (0) |
162 | # define debug_rtlock_wait_restore_state() do { } while (0) | |
85019c16 TG |
163 | #endif |
164 | ||
498d0c57 AM |
165 | /* |
166 | * set_current_state() includes a barrier so that the write of current->state | |
167 | * is correctly serialised wrt the caller's subsequent test of whether to | |
168 | * actually sleep: | |
169 | * | |
a2250238 | 170 | * for (;;) { |
498d0c57 | 171 | * set_current_state(TASK_UNINTERRUPTIBLE); |
58877d34 PZ |
172 | * if (CONDITION) |
173 | * break; | |
a2250238 PZ |
174 | * |
175 | * schedule(); | |
176 | * } | |
177 | * __set_current_state(TASK_RUNNING); | |
178 | * | |
179 | * If the caller does not need such serialisation (because, for instance, the | |
58877d34 | 180 | * CONDITION test and condition change and wakeup are under the same lock) then |
a2250238 PZ |
181 | * use __set_current_state(). |
182 | * | |
183 | * The above is typically ordered against the wakeup, which does: | |
184 | * | |
58877d34 | 185 | * CONDITION = 1; |
b5bf9a90 | 186 | * wake_up_state(p, TASK_UNINTERRUPTIBLE); |
a2250238 | 187 | * |
58877d34 PZ |
188 | * where wake_up_state()/try_to_wake_up() executes a full memory barrier before |
189 | * accessing p->state. | |
a2250238 PZ |
190 | * |
191 | * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is, | |
192 | * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a | |
193 | * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING). | |
498d0c57 | 194 | * |
b5bf9a90 | 195 | * However, with slightly different timing the wakeup TASK_RUNNING store can |
dfcb245e | 196 | * also collide with the TASK_UNINTERRUPTIBLE store. Losing that store is not |
b5bf9a90 PZ |
197 | * a problem either because that will result in one extra go around the loop |
198 | * and our @cond test will save the day. | |
498d0c57 | 199 | * |
a2250238 | 200 | * Also see the comments of try_to_wake_up(). |
498d0c57 | 201 | */ |
b5bf9a90 | 202 | #define __set_current_state(state_value) \ |
85019c16 TG |
203 | do { \ |
204 | debug_normal_state_change((state_value)); \ | |
205 | WRITE_ONCE(current->__state, (state_value)); \ | |
206 | } while (0) | |
b5bf9a90 PZ |
207 | |
208 | #define set_current_state(state_value) \ | |
85019c16 TG |
209 | do { \ |
210 | debug_normal_state_change((state_value)); \ | |
211 | smp_store_mb(current->__state, (state_value)); \ | |
212 | } while (0) | |
b5bf9a90 PZ |
213 | |
214 | /* | |
215 | * set_special_state() should be used for those states when the blocking task | |
216 | * can not use the regular condition based wait-loop. In that case we must | |
85019c16 TG |
217 | * serialize against wakeups such that any possible in-flight TASK_RUNNING |
218 | * stores will not collide with our state change. | |
b5bf9a90 PZ |
219 | */ |
220 | #define set_special_state(state_value) \ | |
221 | do { \ | |
222 | unsigned long flags; /* may shadow */ \ | |
85019c16 | 223 | \ |
b5bf9a90 | 224 | raw_spin_lock_irqsave(¤t->pi_lock, flags); \ |
85019c16 | 225 | debug_special_state_change((state_value)); \ |
2f064a59 | 226 | WRITE_ONCE(current->__state, (state_value)); \ |
b5bf9a90 PZ |
227 | raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \ |
228 | } while (0) | |
229 | ||
5f220be2 TG |
230 | /* |
231 | * PREEMPT_RT specific variants for "sleeping" spin/rwlocks | |
232 | * | |
233 | * RT's spin/rwlock substitutions are state preserving. The state of the | |
234 | * task when blocking on the lock is saved in task_struct::saved_state and | |
235 | * restored after the lock has been acquired. These operations are | |
236 | * serialized by task_struct::pi_lock against try_to_wake_up(). Any non RT | |
237 | * lock related wakeups while the task is blocked on the lock are | |
238 | * redirected to operate on task_struct::saved_state to ensure that these | |
239 | * are not dropped. On restore task_struct::saved_state is set to | |
240 | * TASK_RUNNING so any wakeup attempt redirected to saved_state will fail. | |
241 | * | |
242 | * The lock operation looks like this: | |
243 | * | |
244 | * current_save_and_set_rtlock_wait_state(); | |
245 | * for (;;) { | |
246 | * if (try_lock()) | |
247 | * break; | |
248 | * raw_spin_unlock_irq(&lock->wait_lock); | |
249 | * schedule_rtlock(); | |
250 | * raw_spin_lock_irq(&lock->wait_lock); | |
251 | * set_current_state(TASK_RTLOCK_WAIT); | |
252 | * } | |
253 | * current_restore_rtlock_saved_state(); | |
254 | */ | |
255 | #define current_save_and_set_rtlock_wait_state() \ | |
256 | do { \ | |
257 | lockdep_assert_irqs_disabled(); \ | |
258 | raw_spin_lock(¤t->pi_lock); \ | |
259 | current->saved_state = current->__state; \ | |
260 | debug_rtlock_wait_set_state(); \ | |
261 | WRITE_ONCE(current->__state, TASK_RTLOCK_WAIT); \ | |
262 | raw_spin_unlock(¤t->pi_lock); \ | |
263 | } while (0); | |
264 | ||
265 | #define current_restore_rtlock_saved_state() \ | |
266 | do { \ | |
267 | lockdep_assert_irqs_disabled(); \ | |
268 | raw_spin_lock(¤t->pi_lock); \ | |
269 | debug_rtlock_wait_restore_state(); \ | |
270 | WRITE_ONCE(current->__state, current->saved_state); \ | |
271 | current->saved_state = TASK_RUNNING; \ | |
272 | raw_spin_unlock(¤t->pi_lock); \ | |
273 | } while (0); | |
8eb23b9f | 274 | |
2f064a59 | 275 | #define get_current_state() READ_ONCE(current->__state) |
d6c23bb3 | 276 | |
3087c61e YS |
277 | /* |
278 | * Define the task command name length as enum, then it can be visible to | |
279 | * BPF programs. | |
280 | */ | |
281 | enum { | |
282 | TASK_COMM_LEN = 16, | |
283 | }; | |
1da177e4 | 284 | |
1da177e4 LT |
285 | extern void scheduler_tick(void); |
286 | ||
5eca1c10 IM |
287 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
288 | ||
289 | extern long schedule_timeout(long timeout); | |
290 | extern long schedule_timeout_interruptible(long timeout); | |
291 | extern long schedule_timeout_killable(long timeout); | |
292 | extern long schedule_timeout_uninterruptible(long timeout); | |
293 | extern long schedule_timeout_idle(long timeout); | |
1da177e4 | 294 | asmlinkage void schedule(void); |
c5491ea7 | 295 | extern void schedule_preempt_disabled(void); |
19c95f26 | 296 | asmlinkage void preempt_schedule_irq(void); |
6991436c TG |
297 | #ifdef CONFIG_PREEMPT_RT |
298 | extern void schedule_rtlock(void); | |
299 | #endif | |
1da177e4 | 300 | |
10ab5643 TH |
301 | extern int __must_check io_schedule_prepare(void); |
302 | extern void io_schedule_finish(int token); | |
9cff8ade | 303 | extern long io_schedule_timeout(long timeout); |
10ab5643 | 304 | extern void io_schedule(void); |
9cff8ade | 305 | |
d37f761d | 306 | /** |
0ba42a59 | 307 | * struct prev_cputime - snapshot of system and user cputime |
d37f761d FW |
308 | * @utime: time spent in user mode |
309 | * @stime: time spent in system mode | |
9d7fb042 | 310 | * @lock: protects the above two fields |
d37f761d | 311 | * |
9d7fb042 PZ |
312 | * Stores previous user/system time values such that we can guarantee |
313 | * monotonicity. | |
d37f761d | 314 | */ |
9d7fb042 PZ |
315 | struct prev_cputime { |
316 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
5eca1c10 IM |
317 | u64 utime; |
318 | u64 stime; | |
319 | raw_spinlock_t lock; | |
9d7fb042 | 320 | #endif |
d37f761d FW |
321 | }; |
322 | ||
bac5b6b6 FW |
323 | enum vtime_state { |
324 | /* Task is sleeping or running in a CPU with VTIME inactive: */ | |
325 | VTIME_INACTIVE = 0, | |
14faf6fc FW |
326 | /* Task is idle */ |
327 | VTIME_IDLE, | |
bac5b6b6 FW |
328 | /* Task runs in kernelspace in a CPU with VTIME active: */ |
329 | VTIME_SYS, | |
14faf6fc FW |
330 | /* Task runs in userspace in a CPU with VTIME active: */ |
331 | VTIME_USER, | |
e6d5bf3e FW |
332 | /* Task runs as guests in a CPU with VTIME active: */ |
333 | VTIME_GUEST, | |
bac5b6b6 FW |
334 | }; |
335 | ||
336 | struct vtime { | |
337 | seqcount_t seqcount; | |
338 | unsigned long long starttime; | |
339 | enum vtime_state state; | |
802f4a82 | 340 | unsigned int cpu; |
2a42eb95 WL |
341 | u64 utime; |
342 | u64 stime; | |
343 | u64 gtime; | |
bac5b6b6 FW |
344 | }; |
345 | ||
69842cba PB |
346 | /* |
347 | * Utilization clamp constraints. | |
348 | * @UCLAMP_MIN: Minimum utilization | |
349 | * @UCLAMP_MAX: Maximum utilization | |
350 | * @UCLAMP_CNT: Utilization clamp constraints count | |
351 | */ | |
352 | enum uclamp_id { | |
353 | UCLAMP_MIN = 0, | |
354 | UCLAMP_MAX, | |
355 | UCLAMP_CNT | |
356 | }; | |
357 | ||
f9a25f77 MP |
358 | #ifdef CONFIG_SMP |
359 | extern struct root_domain def_root_domain; | |
360 | extern struct mutex sched_domains_mutex; | |
361 | #endif | |
362 | ||
1da177e4 | 363 | struct sched_info { |
7f5f8e8d | 364 | #ifdef CONFIG_SCHED_INFO |
5eca1c10 IM |
365 | /* Cumulative counters: */ |
366 | ||
367 | /* # of times we have run on this CPU: */ | |
368 | unsigned long pcount; | |
369 | ||
370 | /* Time spent waiting on a runqueue: */ | |
371 | unsigned long long run_delay; | |
372 | ||
373 | /* Timestamps: */ | |
374 | ||
375 | /* When did we last run on a CPU? */ | |
376 | unsigned long long last_arrival; | |
377 | ||
378 | /* When were we last queued to run? */ | |
379 | unsigned long long last_queued; | |
1da177e4 | 380 | |
f6db8347 | 381 | #endif /* CONFIG_SCHED_INFO */ |
7f5f8e8d | 382 | }; |
1da177e4 | 383 | |
6ecdd749 YD |
384 | /* |
385 | * Integer metrics need fixed point arithmetic, e.g., sched/fair | |
386 | * has a few: load, load_avg, util_avg, freq, and capacity. | |
387 | * | |
388 | * We define a basic fixed point arithmetic range, and then formalize | |
389 | * all these metrics based on that basic range. | |
390 | */ | |
5eca1c10 IM |
391 | # define SCHED_FIXEDPOINT_SHIFT 10 |
392 | # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT) | |
6ecdd749 | 393 | |
69842cba PB |
394 | /* Increase resolution of cpu_capacity calculations */ |
395 | # define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT | |
396 | # define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT) | |
397 | ||
20b8a59f | 398 | struct load_weight { |
5eca1c10 IM |
399 | unsigned long weight; |
400 | u32 inv_weight; | |
20b8a59f IM |
401 | }; |
402 | ||
7f65ea42 PB |
403 | /** |
404 | * struct util_est - Estimation utilization of FAIR tasks | |
405 | * @enqueued: instantaneous estimated utilization of a task/cpu | |
406 | * @ewma: the Exponential Weighted Moving Average (EWMA) | |
407 | * utilization of a task | |
408 | * | |
409 | * Support data structure to track an Exponential Weighted Moving Average | |
410 | * (EWMA) of a FAIR task's utilization. New samples are added to the moving | |
411 | * average each time a task completes an activation. Sample's weight is chosen | |
412 | * so that the EWMA will be relatively insensitive to transient changes to the | |
413 | * task's workload. | |
414 | * | |
415 | * The enqueued attribute has a slightly different meaning for tasks and cpus: | |
416 | * - task: the task's util_avg at last task dequeue time | |
417 | * - cfs_rq: the sum of util_est.enqueued for each RUNNABLE task on that CPU | |
418 | * Thus, the util_est.enqueued of a task represents the contribution on the | |
419 | * estimated utilization of the CPU where that task is currently enqueued. | |
420 | * | |
421 | * Only for tasks we track a moving average of the past instantaneous | |
422 | * estimated utilization. This allows to absorb sporadic drops in utilization | |
423 | * of an otherwise almost periodic task. | |
68d7a190 DE |
424 | * |
425 | * The UTIL_AVG_UNCHANGED flag is used to synchronize util_est with util_avg | |
426 | * updates. When a task is dequeued, its util_est should not be updated if its | |
427 | * util_avg has not been updated in the meantime. | |
428 | * This information is mapped into the MSB bit of util_est.enqueued at dequeue | |
429 | * time. Since max value of util_est.enqueued for a task is 1024 (PELT util_avg | |
430 | * for a task) it is safe to use MSB. | |
7f65ea42 PB |
431 | */ |
432 | struct util_est { | |
433 | unsigned int enqueued; | |
434 | unsigned int ewma; | |
435 | #define UTIL_EST_WEIGHT_SHIFT 2 | |
68d7a190 | 436 | #define UTIL_AVG_UNCHANGED 0x80000000 |
317d359d | 437 | } __attribute__((__aligned__(sizeof(u64)))); |
7f65ea42 | 438 | |
9d89c257 | 439 | /* |
9f683953 | 440 | * The load/runnable/util_avg accumulates an infinite geometric series |
0dacee1b | 441 | * (see __update_load_avg_cfs_rq() in kernel/sched/pelt.c). |
7b595334 YD |
442 | * |
443 | * [load_avg definition] | |
444 | * | |
445 | * load_avg = runnable% * scale_load_down(load) | |
446 | * | |
9f683953 VG |
447 | * [runnable_avg definition] |
448 | * | |
449 | * runnable_avg = runnable% * SCHED_CAPACITY_SCALE | |
7b595334 | 450 | * |
7b595334 YD |
451 | * [util_avg definition] |
452 | * | |
453 | * util_avg = running% * SCHED_CAPACITY_SCALE | |
454 | * | |
9f683953 VG |
455 | * where runnable% is the time ratio that a sched_entity is runnable and |
456 | * running% the time ratio that a sched_entity is running. | |
457 | * | |
458 | * For cfs_rq, they are the aggregated values of all runnable and blocked | |
459 | * sched_entities. | |
7b595334 | 460 | * |
c1b7b8d4 | 461 | * The load/runnable/util_avg doesn't directly factor frequency scaling and CPU |
9f683953 VG |
462 | * capacity scaling. The scaling is done through the rq_clock_pelt that is used |
463 | * for computing those signals (see update_rq_clock_pelt()) | |
7b595334 | 464 | * |
23127296 VG |
465 | * N.B., the above ratios (runnable% and running%) themselves are in the |
466 | * range of [0, 1]. To do fixed point arithmetics, we therefore scale them | |
467 | * to as large a range as necessary. This is for example reflected by | |
468 | * util_avg's SCHED_CAPACITY_SCALE. | |
7b595334 YD |
469 | * |
470 | * [Overflow issue] | |
471 | * | |
472 | * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities | |
473 | * with the highest load (=88761), always runnable on a single cfs_rq, | |
474 | * and should not overflow as the number already hits PID_MAX_LIMIT. | |
475 | * | |
476 | * For all other cases (including 32-bit kernels), struct load_weight's | |
477 | * weight will overflow first before we do, because: | |
478 | * | |
479 | * Max(load_avg) <= Max(load.weight) | |
480 | * | |
481 | * Then it is the load_weight's responsibility to consider overflow | |
482 | * issues. | |
9d89c257 | 483 | */ |
9d85f21c | 484 | struct sched_avg { |
5eca1c10 IM |
485 | u64 last_update_time; |
486 | u64 load_sum; | |
9f683953 | 487 | u64 runnable_sum; |
5eca1c10 IM |
488 | u32 util_sum; |
489 | u32 period_contrib; | |
490 | unsigned long load_avg; | |
9f683953 | 491 | unsigned long runnable_avg; |
5eca1c10 | 492 | unsigned long util_avg; |
7f65ea42 | 493 | struct util_est util_est; |
317d359d | 494 | } ____cacheline_aligned; |
9d85f21c | 495 | |
41acab88 | 496 | struct sched_statistics { |
7f5f8e8d | 497 | #ifdef CONFIG_SCHEDSTATS |
5eca1c10 IM |
498 | u64 wait_start; |
499 | u64 wait_max; | |
500 | u64 wait_count; | |
501 | u64 wait_sum; | |
502 | u64 iowait_count; | |
503 | u64 iowait_sum; | |
504 | ||
505 | u64 sleep_start; | |
506 | u64 sleep_max; | |
507 | s64 sum_sleep_runtime; | |
508 | ||
509 | u64 block_start; | |
510 | u64 block_max; | |
847fc0cd YS |
511 | s64 sum_block_runtime; |
512 | ||
5eca1c10 IM |
513 | u64 exec_max; |
514 | u64 slice_max; | |
515 | ||
516 | u64 nr_migrations_cold; | |
517 | u64 nr_failed_migrations_affine; | |
518 | u64 nr_failed_migrations_running; | |
519 | u64 nr_failed_migrations_hot; | |
520 | u64 nr_forced_migrations; | |
521 | ||
522 | u64 nr_wakeups; | |
523 | u64 nr_wakeups_sync; | |
524 | u64 nr_wakeups_migrate; | |
525 | u64 nr_wakeups_local; | |
526 | u64 nr_wakeups_remote; | |
527 | u64 nr_wakeups_affine; | |
528 | u64 nr_wakeups_affine_attempts; | |
529 | u64 nr_wakeups_passive; | |
530 | u64 nr_wakeups_idle; | |
4feee7d1 JD |
531 | |
532 | #ifdef CONFIG_SCHED_CORE | |
533 | u64 core_forceidle_sum; | |
41acab88 | 534 | #endif |
4feee7d1 | 535 | #endif /* CONFIG_SCHEDSTATS */ |
ceeadb83 | 536 | } ____cacheline_aligned; |
41acab88 LDM |
537 | |
538 | struct sched_entity { | |
5eca1c10 IM |
539 | /* For load-balancing: */ |
540 | struct load_weight load; | |
541 | struct rb_node run_node; | |
542 | struct list_head group_node; | |
543 | unsigned int on_rq; | |
41acab88 | 544 | |
5eca1c10 IM |
545 | u64 exec_start; |
546 | u64 sum_exec_runtime; | |
547 | u64 vruntime; | |
548 | u64 prev_sum_exec_runtime; | |
41acab88 | 549 | |
5eca1c10 | 550 | u64 nr_migrations; |
41acab88 | 551 | |
20b8a59f | 552 | #ifdef CONFIG_FAIR_GROUP_SCHED |
5eca1c10 IM |
553 | int depth; |
554 | struct sched_entity *parent; | |
20b8a59f | 555 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 556 | struct cfs_rq *cfs_rq; |
20b8a59f | 557 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 558 | struct cfs_rq *my_q; |
9f683953 VG |
559 | /* cached value of my_q->h_nr_running */ |
560 | unsigned long runnable_weight; | |
20b8a59f | 561 | #endif |
8bd75c77 | 562 | |
141965c7 | 563 | #ifdef CONFIG_SMP |
5a107804 JO |
564 | /* |
565 | * Per entity load average tracking. | |
566 | * | |
567 | * Put into separate cache line so it does not | |
568 | * collide with read-mostly values above. | |
569 | */ | |
317d359d | 570 | struct sched_avg avg; |
9d85f21c | 571 | #endif |
20b8a59f | 572 | }; |
70b97a7f | 573 | |
fa717060 | 574 | struct sched_rt_entity { |
5eca1c10 IM |
575 | struct list_head run_list; |
576 | unsigned long timeout; | |
577 | unsigned long watchdog_stamp; | |
578 | unsigned int time_slice; | |
579 | unsigned short on_rq; | |
580 | unsigned short on_list; | |
581 | ||
582 | struct sched_rt_entity *back; | |
052f1dc7 | 583 | #ifdef CONFIG_RT_GROUP_SCHED |
5eca1c10 | 584 | struct sched_rt_entity *parent; |
6f505b16 | 585 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 586 | struct rt_rq *rt_rq; |
6f505b16 | 587 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 588 | struct rt_rq *my_q; |
6f505b16 | 589 | #endif |
3859a271 | 590 | } __randomize_layout; |
fa717060 | 591 | |
aab03e05 | 592 | struct sched_dl_entity { |
5eca1c10 | 593 | struct rb_node rb_node; |
aab03e05 DF |
594 | |
595 | /* | |
596 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 597 | * during sched_setattr(), they will remain the same until |
598 | * the next sched_setattr(). | |
aab03e05 | 599 | */ |
5eca1c10 IM |
600 | u64 dl_runtime; /* Maximum runtime for each instance */ |
601 | u64 dl_deadline; /* Relative deadline of each instance */ | |
602 | u64 dl_period; /* Separation of two instances (period) */ | |
54d6d303 | 603 | u64 dl_bw; /* dl_runtime / dl_period */ |
3effcb42 | 604 | u64 dl_density; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
605 | |
606 | /* | |
607 | * Actual scheduling parameters. Initialized with the values above, | |
dfcb245e | 608 | * they are continuously updated during task execution. Note that |
aab03e05 DF |
609 | * the remaining runtime could be < 0 in case we are in overrun. |
610 | */ | |
5eca1c10 IM |
611 | s64 runtime; /* Remaining runtime for this instance */ |
612 | u64 deadline; /* Absolute deadline for this instance */ | |
613 | unsigned int flags; /* Specifying the scheduler behaviour */ | |
aab03e05 DF |
614 | |
615 | /* | |
616 | * Some bool flags: | |
617 | * | |
618 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
619 | * task has to wait for a replenishment to be performed at the | |
620 | * next firing of dl_timer. | |
621 | * | |
5eca1c10 | 622 | * @dl_yielded tells if task gave up the CPU before consuming |
5bfd126e | 623 | * all its available runtime during the last job. |
209a0cbd LA |
624 | * |
625 | * @dl_non_contending tells if the task is inactive while still | |
626 | * contributing to the active utilization. In other words, it | |
627 | * indicates if the inactive timer has been armed and its handler | |
628 | * has not been executed yet. This flag is useful to avoid race | |
629 | * conditions between the inactive timer handler and the wakeup | |
630 | * code. | |
34be3930 JL |
631 | * |
632 | * @dl_overrun tells if the task asked to be informed about runtime | |
633 | * overruns. | |
aab03e05 | 634 | */ |
aa5222e9 | 635 | unsigned int dl_throttled : 1; |
aa5222e9 DC |
636 | unsigned int dl_yielded : 1; |
637 | unsigned int dl_non_contending : 1; | |
34be3930 | 638 | unsigned int dl_overrun : 1; |
aab03e05 DF |
639 | |
640 | /* | |
641 | * Bandwidth enforcement timer. Each -deadline task has its | |
642 | * own bandwidth to be enforced, thus we need one timer per task. | |
643 | */ | |
5eca1c10 | 644 | struct hrtimer dl_timer; |
209a0cbd LA |
645 | |
646 | /* | |
647 | * Inactive timer, responsible for decreasing the active utilization | |
648 | * at the "0-lag time". When a -deadline task blocks, it contributes | |
649 | * to GRUB's active utilization until the "0-lag time", hence a | |
650 | * timer is needed to decrease the active utilization at the correct | |
651 | * time. | |
652 | */ | |
653 | struct hrtimer inactive_timer; | |
2279f540 JL |
654 | |
655 | #ifdef CONFIG_RT_MUTEXES | |
656 | /* | |
657 | * Priority Inheritance. When a DEADLINE scheduling entity is boosted | |
658 | * pi_se points to the donor, otherwise points to the dl_se it belongs | |
659 | * to (the original one/itself). | |
660 | */ | |
661 | struct sched_dl_entity *pi_se; | |
662 | #endif | |
aab03e05 | 663 | }; |
8bd75c77 | 664 | |
69842cba PB |
665 | #ifdef CONFIG_UCLAMP_TASK |
666 | /* Number of utilization clamp buckets (shorter alias) */ | |
667 | #define UCLAMP_BUCKETS CONFIG_UCLAMP_BUCKETS_COUNT | |
668 | ||
669 | /* | |
670 | * Utilization clamp for a scheduling entity | |
671 | * @value: clamp value "assigned" to a se | |
672 | * @bucket_id: bucket index corresponding to the "assigned" value | |
e8f14172 | 673 | * @active: the se is currently refcounted in a rq's bucket |
a509a7cd | 674 | * @user_defined: the requested clamp value comes from user-space |
69842cba PB |
675 | * |
676 | * The bucket_id is the index of the clamp bucket matching the clamp value | |
677 | * which is pre-computed and stored to avoid expensive integer divisions from | |
678 | * the fast path. | |
e8f14172 PB |
679 | * |
680 | * The active bit is set whenever a task has got an "effective" value assigned, | |
681 | * which can be different from the clamp value "requested" from user-space. | |
682 | * This allows to know a task is refcounted in the rq's bucket corresponding | |
683 | * to the "effective" bucket_id. | |
a509a7cd PB |
684 | * |
685 | * The user_defined bit is set whenever a task has got a task-specific clamp | |
686 | * value requested from userspace, i.e. the system defaults apply to this task | |
687 | * just as a restriction. This allows to relax default clamps when a less | |
688 | * restrictive task-specific value has been requested, thus allowing to | |
689 | * implement a "nice" semantic. For example, a task running with a 20% | |
690 | * default boost can still drop its own boosting to 0%. | |
69842cba PB |
691 | */ |
692 | struct uclamp_se { | |
693 | unsigned int value : bits_per(SCHED_CAPACITY_SCALE); | |
694 | unsigned int bucket_id : bits_per(UCLAMP_BUCKETS); | |
e8f14172 | 695 | unsigned int active : 1; |
a509a7cd | 696 | unsigned int user_defined : 1; |
69842cba PB |
697 | }; |
698 | #endif /* CONFIG_UCLAMP_TASK */ | |
699 | ||
1d082fd0 PM |
700 | union rcu_special { |
701 | struct { | |
5eca1c10 IM |
702 | u8 blocked; |
703 | u8 need_qs; | |
05f41571 | 704 | u8 exp_hint; /* Hint for performance. */ |
276c4104 | 705 | u8 need_mb; /* Readers need smp_mb(). */ |
8203d6d0 | 706 | } b; /* Bits. */ |
05f41571 | 707 | u32 s; /* Set of bits. */ |
1d082fd0 | 708 | }; |
86848966 | 709 | |
8dc85d54 PZ |
710 | enum perf_event_task_context { |
711 | perf_invalid_context = -1, | |
712 | perf_hw_context = 0, | |
89a1e187 | 713 | perf_sw_context, |
8dc85d54 PZ |
714 | perf_nr_task_contexts, |
715 | }; | |
716 | ||
eb61baf6 IM |
717 | struct wake_q_node { |
718 | struct wake_q_node *next; | |
719 | }; | |
720 | ||
5fbda3ec TG |
721 | struct kmap_ctrl { |
722 | #ifdef CONFIG_KMAP_LOCAL | |
723 | int idx; | |
724 | pte_t pteval[KM_MAX_IDX]; | |
725 | #endif | |
726 | }; | |
727 | ||
1da177e4 | 728 | struct task_struct { |
c65eacbe AL |
729 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
730 | /* | |
731 | * For reasons of header soup (see current_thread_info()), this | |
732 | * must be the first element of task_struct. | |
733 | */ | |
5eca1c10 | 734 | struct thread_info thread_info; |
c65eacbe | 735 | #endif |
2f064a59 | 736 | unsigned int __state; |
29e48ce8 | 737 | |
5f220be2 TG |
738 | #ifdef CONFIG_PREEMPT_RT |
739 | /* saved state for "spinlock sleepers" */ | |
740 | unsigned int saved_state; | |
741 | #endif | |
742 | ||
29e48ce8 KC |
743 | /* |
744 | * This begins the randomizable portion of task_struct. Only | |
745 | * scheduling-critical items should be added above here. | |
746 | */ | |
747 | randomized_struct_fields_start | |
748 | ||
5eca1c10 | 749 | void *stack; |
ec1d2819 | 750 | refcount_t usage; |
5eca1c10 IM |
751 | /* Per task flags (PF_*), defined further below: */ |
752 | unsigned int flags; | |
753 | unsigned int ptrace; | |
1da177e4 | 754 | |
2dd73a4f | 755 | #ifdef CONFIG_SMP |
5eca1c10 | 756 | int on_cpu; |
8c4890d1 | 757 | struct __call_single_node wake_entry; |
5eca1c10 IM |
758 | unsigned int wakee_flips; |
759 | unsigned long wakee_flip_decay_ts; | |
760 | struct task_struct *last_wakee; | |
ac66f547 | 761 | |
32e839dd MG |
762 | /* |
763 | * recent_used_cpu is initially set as the last CPU used by a task | |
764 | * that wakes affine another task. Waker/wakee relationships can | |
765 | * push tasks around a CPU where each wakeup moves to the next one. | |
766 | * Tracking a recently used CPU allows a quick search for a recently | |
767 | * used CPU that may be idle. | |
768 | */ | |
769 | int recent_used_cpu; | |
5eca1c10 | 770 | int wake_cpu; |
2dd73a4f | 771 | #endif |
5eca1c10 IM |
772 | int on_rq; |
773 | ||
774 | int prio; | |
775 | int static_prio; | |
776 | int normal_prio; | |
777 | unsigned int rt_priority; | |
50e645a8 | 778 | |
5eca1c10 IM |
779 | struct sched_entity se; |
780 | struct sched_rt_entity rt; | |
8a311c74 | 781 | struct sched_dl_entity dl; |
804bccba | 782 | const struct sched_class *sched_class; |
8a311c74 PZ |
783 | |
784 | #ifdef CONFIG_SCHED_CORE | |
785 | struct rb_node core_node; | |
786 | unsigned long core_cookie; | |
d2dfa17b | 787 | unsigned int core_occupation; |
8a311c74 PZ |
788 | #endif |
789 | ||
8323f26c | 790 | #ifdef CONFIG_CGROUP_SCHED |
5eca1c10 | 791 | struct task_group *sched_task_group; |
8323f26c | 792 | #endif |
1da177e4 | 793 | |
69842cba | 794 | #ifdef CONFIG_UCLAMP_TASK |
13685c4a QY |
795 | /* |
796 | * Clamp values requested for a scheduling entity. | |
797 | * Must be updated with task_rq_lock() held. | |
798 | */ | |
e8f14172 | 799 | struct uclamp_se uclamp_req[UCLAMP_CNT]; |
13685c4a QY |
800 | /* |
801 | * Effective clamp values used for a scheduling entity. | |
802 | * Must be updated with task_rq_lock() held. | |
803 | */ | |
69842cba PB |
804 | struct uclamp_se uclamp[UCLAMP_CNT]; |
805 | #endif | |
806 | ||
ceeadb83 YS |
807 | struct sched_statistics stats; |
808 | ||
e107be36 | 809 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
5eca1c10 IM |
810 | /* List of struct preempt_notifier: */ |
811 | struct hlist_head preempt_notifiers; | |
e107be36 AK |
812 | #endif |
813 | ||
6c5c9341 | 814 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
5eca1c10 | 815 | unsigned int btrace_seq; |
6c5c9341 | 816 | #endif |
1da177e4 | 817 | |
5eca1c10 IM |
818 | unsigned int policy; |
819 | int nr_cpus_allowed; | |
3bd37062 | 820 | const cpumask_t *cpus_ptr; |
b90ca8ba | 821 | cpumask_t *user_cpus_ptr; |
3bd37062 | 822 | cpumask_t cpus_mask; |
6d337eab | 823 | void *migration_pending; |
74d862b6 | 824 | #ifdef CONFIG_SMP |
a7c81556 | 825 | unsigned short migration_disabled; |
af449901 | 826 | #endif |
a7c81556 | 827 | unsigned short migration_flags; |
1da177e4 | 828 | |
a57eb940 | 829 | #ifdef CONFIG_PREEMPT_RCU |
5eca1c10 IM |
830 | int rcu_read_lock_nesting; |
831 | union rcu_special rcu_read_unlock_special; | |
832 | struct list_head rcu_node_entry; | |
833 | struct rcu_node *rcu_blocked_node; | |
28f6569a | 834 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
5eca1c10 | 835 | |
8315f422 | 836 | #ifdef CONFIG_TASKS_RCU |
5eca1c10 | 837 | unsigned long rcu_tasks_nvcsw; |
ccdd29ff PM |
838 | u8 rcu_tasks_holdout; |
839 | u8 rcu_tasks_idx; | |
5eca1c10 | 840 | int rcu_tasks_idle_cpu; |
ccdd29ff | 841 | struct list_head rcu_tasks_holdout_list; |
8315f422 | 842 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
e260be67 | 843 | |
d5f177d3 PM |
844 | #ifdef CONFIG_TASKS_TRACE_RCU |
845 | int trc_reader_nesting; | |
846 | int trc_ipi_to_cpu; | |
276c4104 | 847 | union rcu_special trc_reader_special; |
d5f177d3 PM |
848 | bool trc_reader_checked; |
849 | struct list_head trc_holdout_list; | |
850 | #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */ | |
851 | ||
5eca1c10 | 852 | struct sched_info sched_info; |
1da177e4 | 853 | |
5eca1c10 | 854 | struct list_head tasks; |
806c09a7 | 855 | #ifdef CONFIG_SMP |
5eca1c10 IM |
856 | struct plist_node pushable_tasks; |
857 | struct rb_node pushable_dl_tasks; | |
806c09a7 | 858 | #endif |
1da177e4 | 859 | |
5eca1c10 IM |
860 | struct mm_struct *mm; |
861 | struct mm_struct *active_mm; | |
314ff785 IM |
862 | |
863 | /* Per-thread vma caching: */ | |
5eca1c10 | 864 | struct vmacache vmacache; |
314ff785 | 865 | |
5eca1c10 IM |
866 | #ifdef SPLIT_RSS_COUNTING |
867 | struct task_rss_stat rss_stat; | |
34e55232 | 868 | #endif |
5eca1c10 IM |
869 | int exit_state; |
870 | int exit_code; | |
871 | int exit_signal; | |
872 | /* The signal sent when the parent dies: */ | |
873 | int pdeath_signal; | |
874 | /* JOBCTL_*, siglock protected: */ | |
875 | unsigned long jobctl; | |
876 | ||
877 | /* Used for emulating ABI behavior of previous Linux versions: */ | |
878 | unsigned int personality; | |
879 | ||
880 | /* Scheduler bits, serialized by scheduler locks: */ | |
881 | unsigned sched_reset_on_fork:1; | |
882 | unsigned sched_contributes_to_load:1; | |
883 | unsigned sched_migrated:1; | |
eb414681 JW |
884 | #ifdef CONFIG_PSI |
885 | unsigned sched_psi_wake_requeue:1; | |
886 | #endif | |
887 | ||
5eca1c10 IM |
888 | /* Force alignment to the next boundary: */ |
889 | unsigned :0; | |
890 | ||
891 | /* Unserialized, strictly 'current' */ | |
892 | ||
f97bb527 PZ |
893 | /* |
894 | * This field must not be in the scheduler word above due to wakelist | |
895 | * queueing no longer being serialized by p->on_cpu. However: | |
896 | * | |
897 | * p->XXX = X; ttwu() | |
898 | * schedule() if (p->on_rq && ..) // false | |
899 | * smp_mb__after_spinlock(); if (smp_load_acquire(&p->on_cpu) && //true | |
900 | * deactivate_task() ttwu_queue_wakelist()) | |
901 | * p->on_rq = 0; p->sched_remote_wakeup = Y; | |
902 | * | |
903 | * guarantees all stores of 'current' are visible before | |
904 | * ->sched_remote_wakeup gets used, so it can be in this word. | |
905 | */ | |
906 | unsigned sched_remote_wakeup:1; | |
907 | ||
5eca1c10 IM |
908 | /* Bit to tell LSMs we're in execve(): */ |
909 | unsigned in_execve:1; | |
910 | unsigned in_iowait:1; | |
911 | #ifndef TIF_RESTORE_SIGMASK | |
912 | unsigned restore_sigmask:1; | |
7e781418 | 913 | #endif |
626ebc41 | 914 | #ifdef CONFIG_MEMCG |
29ef680a | 915 | unsigned in_user_fault:1; |
127424c8 | 916 | #endif |
ff303e66 | 917 | #ifdef CONFIG_COMPAT_BRK |
5eca1c10 | 918 | unsigned brk_randomized:1; |
ff303e66 | 919 | #endif |
77f88796 TH |
920 | #ifdef CONFIG_CGROUPS |
921 | /* disallow userland-initiated cgroup migration */ | |
922 | unsigned no_cgroup_migration:1; | |
76f969e8 RG |
923 | /* task is frozen/stopped (used by the cgroup freezer) */ |
924 | unsigned frozen:1; | |
77f88796 | 925 | #endif |
d09d8df3 | 926 | #ifdef CONFIG_BLK_CGROUP |
d09d8df3 JB |
927 | unsigned use_memdelay:1; |
928 | #endif | |
1066d1b6 YS |
929 | #ifdef CONFIG_PSI |
930 | /* Stalled due to lack of memory */ | |
931 | unsigned in_memstall:1; | |
932 | #endif | |
8e9b16c4 ST |
933 | #ifdef CONFIG_PAGE_OWNER |
934 | /* Used by page_owner=on to detect recursion in page tracking. */ | |
935 | unsigned in_page_owner:1; | |
936 | #endif | |
b542e383 TG |
937 | #ifdef CONFIG_EVENTFD |
938 | /* Recursion prevention for eventfd_signal() */ | |
939 | unsigned in_eventfd_signal:1; | |
940 | #endif | |
a3d29e82 PZ |
941 | #ifdef CONFIG_IOMMU_SVA |
942 | unsigned pasid_activated:1; | |
943 | #endif | |
6f185c29 | 944 | |
5eca1c10 | 945 | unsigned long atomic_flags; /* Flags requiring atomic access. */ |
1d4457f9 | 946 | |
5eca1c10 | 947 | struct restart_block restart_block; |
f56141e3 | 948 | |
5eca1c10 IM |
949 | pid_t pid; |
950 | pid_t tgid; | |
0a425405 | 951 | |
050e9baa | 952 | #ifdef CONFIG_STACKPROTECTOR |
5eca1c10 IM |
953 | /* Canary value for the -fstack-protector GCC feature: */ |
954 | unsigned long stack_canary; | |
1314562a | 955 | #endif |
4d1d61a6 | 956 | /* |
5eca1c10 | 957 | * Pointers to the (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 958 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 959 | * p->real_parent->pid) |
1da177e4 | 960 | */ |
5eca1c10 IM |
961 | |
962 | /* Real parent process: */ | |
963 | struct task_struct __rcu *real_parent; | |
964 | ||
965 | /* Recipient of SIGCHLD, wait4() reports: */ | |
966 | struct task_struct __rcu *parent; | |
967 | ||
1da177e4 | 968 | /* |
5eca1c10 | 969 | * Children/sibling form the list of natural children: |
1da177e4 | 970 | */ |
5eca1c10 IM |
971 | struct list_head children; |
972 | struct list_head sibling; | |
973 | struct task_struct *group_leader; | |
1da177e4 | 974 | |
f470021a | 975 | /* |
5eca1c10 IM |
976 | * 'ptraced' is the list of tasks this task is using ptrace() on. |
977 | * | |
f470021a | 978 | * This includes both natural children and PTRACE_ATTACH targets. |
5eca1c10 | 979 | * 'ptrace_entry' is this task's link on the p->parent->ptraced list. |
f470021a | 980 | */ |
5eca1c10 IM |
981 | struct list_head ptraced; |
982 | struct list_head ptrace_entry; | |
f470021a | 983 | |
1da177e4 | 984 | /* PID/PID hash table linkage. */ |
2c470475 EB |
985 | struct pid *thread_pid; |
986 | struct hlist_node pid_links[PIDTYPE_MAX]; | |
5eca1c10 IM |
987 | struct list_head thread_group; |
988 | struct list_head thread_node; | |
989 | ||
990 | struct completion *vfork_done; | |
1da177e4 | 991 | |
5eca1c10 IM |
992 | /* CLONE_CHILD_SETTID: */ |
993 | int __user *set_child_tid; | |
1da177e4 | 994 | |
5eca1c10 IM |
995 | /* CLONE_CHILD_CLEARTID: */ |
996 | int __user *clear_child_tid; | |
997 | ||
e32cf5df EB |
998 | /* PF_KTHREAD | PF_IO_WORKER */ |
999 | void *worker_private; | |
3bfe6106 | 1000 | |
5eca1c10 IM |
1001 | u64 utime; |
1002 | u64 stime; | |
40565b5a | 1003 | #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME |
5eca1c10 IM |
1004 | u64 utimescaled; |
1005 | u64 stimescaled; | |
40565b5a | 1006 | #endif |
5eca1c10 IM |
1007 | u64 gtime; |
1008 | struct prev_cputime prev_cputime; | |
6a61671b | 1009 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
bac5b6b6 | 1010 | struct vtime vtime; |
d99ca3b9 | 1011 | #endif |
d027d45d FW |
1012 | |
1013 | #ifdef CONFIG_NO_HZ_FULL | |
5eca1c10 | 1014 | atomic_t tick_dep_mask; |
d027d45d | 1015 | #endif |
5eca1c10 IM |
1016 | /* Context switch counts: */ |
1017 | unsigned long nvcsw; | |
1018 | unsigned long nivcsw; | |
1019 | ||
1020 | /* Monotonic time in nsecs: */ | |
1021 | u64 start_time; | |
1022 | ||
1023 | /* Boot based time in nsecs: */ | |
cf25e24d | 1024 | u64 start_boottime; |
5eca1c10 IM |
1025 | |
1026 | /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */ | |
1027 | unsigned long min_flt; | |
1028 | unsigned long maj_flt; | |
1da177e4 | 1029 | |
2b69942f TG |
1030 | /* Empty if CONFIG_POSIX_CPUTIMERS=n */ |
1031 | struct posix_cputimers posix_cputimers; | |
1da177e4 | 1032 | |
1fb497dd TG |
1033 | #ifdef CONFIG_POSIX_CPU_TIMERS_TASK_WORK |
1034 | struct posix_cputimers_work posix_cputimers_work; | |
1035 | #endif | |
1036 | ||
5eca1c10 IM |
1037 | /* Process credentials: */ |
1038 | ||
1039 | /* Tracer's credentials at attach: */ | |
1040 | const struct cred __rcu *ptracer_cred; | |
1041 | ||
1042 | /* Objective and real subjective task credentials (COW): */ | |
1043 | const struct cred __rcu *real_cred; | |
1044 | ||
1045 | /* Effective (overridable) subjective task credentials (COW): */ | |
1046 | const struct cred __rcu *cred; | |
1047 | ||
7743c48e DH |
1048 | #ifdef CONFIG_KEYS |
1049 | /* Cached requested key. */ | |
1050 | struct key *cached_requested_key; | |
1051 | #endif | |
1052 | ||
5eca1c10 IM |
1053 | /* |
1054 | * executable name, excluding path. | |
1055 | * | |
1056 | * - normally initialized setup_new_exec() | |
1057 | * - access it with [gs]et_task_comm() | |
1058 | * - lock it with task_lock() | |
1059 | */ | |
1060 | char comm[TASK_COMM_LEN]; | |
1061 | ||
1062 | struct nameidata *nameidata; | |
1063 | ||
3d5b6fcc | 1064 | #ifdef CONFIG_SYSVIPC |
5eca1c10 IM |
1065 | struct sysv_sem sysvsem; |
1066 | struct sysv_shm sysvshm; | |
3d5b6fcc | 1067 | #endif |
e162b39a | 1068 | #ifdef CONFIG_DETECT_HUNG_TASK |
5eca1c10 | 1069 | unsigned long last_switch_count; |
a2e51445 | 1070 | unsigned long last_switch_time; |
82a1fcb9 | 1071 | #endif |
5eca1c10 IM |
1072 | /* Filesystem information: */ |
1073 | struct fs_struct *fs; | |
1074 | ||
1075 | /* Open file information: */ | |
1076 | struct files_struct *files; | |
1077 | ||
0f212204 JA |
1078 | #ifdef CONFIG_IO_URING |
1079 | struct io_uring_task *io_uring; | |
1080 | #endif | |
1081 | ||
5eca1c10 IM |
1082 | /* Namespaces: */ |
1083 | struct nsproxy *nsproxy; | |
1084 | ||
1085 | /* Signal handlers: */ | |
1086 | struct signal_struct *signal; | |
913292c9 | 1087 | struct sighand_struct __rcu *sighand; |
5eca1c10 IM |
1088 | sigset_t blocked; |
1089 | sigset_t real_blocked; | |
1090 | /* Restored if set_restore_sigmask() was used: */ | |
1091 | sigset_t saved_sigmask; | |
1092 | struct sigpending pending; | |
1093 | unsigned long sas_ss_sp; | |
1094 | size_t sas_ss_size; | |
1095 | unsigned int sas_ss_flags; | |
1096 | ||
1097 | struct callback_head *task_works; | |
1098 | ||
4b7d248b | 1099 | #ifdef CONFIG_AUDIT |
bfef93a5 | 1100 | #ifdef CONFIG_AUDITSYSCALL |
5f3d544f RGB |
1101 | struct audit_context *audit_context; |
1102 | #endif | |
5eca1c10 IM |
1103 | kuid_t loginuid; |
1104 | unsigned int sessionid; | |
bfef93a5 | 1105 | #endif |
5eca1c10 | 1106 | struct seccomp seccomp; |
1446e1df | 1107 | struct syscall_user_dispatch syscall_dispatch; |
5eca1c10 IM |
1108 | |
1109 | /* Thread group tracking: */ | |
d1e7fd64 EB |
1110 | u64 parent_exec_id; |
1111 | u64 self_exec_id; | |
1da177e4 | 1112 | |
5eca1c10 IM |
1113 | /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */ |
1114 | spinlock_t alloc_lock; | |
1da177e4 | 1115 | |
b29739f9 | 1116 | /* Protection of the PI data structures: */ |
5eca1c10 | 1117 | raw_spinlock_t pi_lock; |
b29739f9 | 1118 | |
5eca1c10 | 1119 | struct wake_q_node wake_q; |
76751049 | 1120 | |
23f78d4a | 1121 | #ifdef CONFIG_RT_MUTEXES |
5eca1c10 | 1122 | /* PI waiters blocked on a rt_mutex held by this task: */ |
a23ba907 | 1123 | struct rb_root_cached pi_waiters; |
e96a7705 XP |
1124 | /* Updated under owner's pi_lock and rq lock */ |
1125 | struct task_struct *pi_top_task; | |
5eca1c10 IM |
1126 | /* Deadlock detection and priority inheritance handling: */ |
1127 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1128 | #endif |
1129 | ||
408894ee | 1130 | #ifdef CONFIG_DEBUG_MUTEXES |
5eca1c10 IM |
1131 | /* Mutex deadlock detection: */ |
1132 | struct mutex_waiter *blocked_on; | |
408894ee | 1133 | #endif |
5eca1c10 | 1134 | |
312364f3 DV |
1135 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
1136 | int non_block_count; | |
1137 | #endif | |
1138 | ||
de30a2b3 | 1139 | #ifdef CONFIG_TRACE_IRQFLAGS |
0584df9c | 1140 | struct irqtrace_events irqtrace; |
de8f5e4f | 1141 | unsigned int hardirq_threaded; |
c86e9b98 | 1142 | u64 hardirq_chain_key; |
5eca1c10 IM |
1143 | int softirqs_enabled; |
1144 | int softirq_context; | |
40db1739 | 1145 | int irq_config; |
de30a2b3 | 1146 | #endif |
728b478d TG |
1147 | #ifdef CONFIG_PREEMPT_RT |
1148 | int softirq_disable_cnt; | |
1149 | #endif | |
5eca1c10 | 1150 | |
fbb9ce95 | 1151 | #ifdef CONFIG_LOCKDEP |
5eca1c10 IM |
1152 | # define MAX_LOCK_DEPTH 48UL |
1153 | u64 curr_chain_key; | |
1154 | int lockdep_depth; | |
1155 | unsigned int lockdep_recursion; | |
1156 | struct held_lock held_locks[MAX_LOCK_DEPTH]; | |
fbb9ce95 | 1157 | #endif |
5eca1c10 | 1158 | |
5cf53f3c | 1159 | #if defined(CONFIG_UBSAN) && !defined(CONFIG_UBSAN_TRAP) |
5eca1c10 | 1160 | unsigned int in_ubsan; |
c6d30853 | 1161 | #endif |
408894ee | 1162 | |
5eca1c10 IM |
1163 | /* Journalling filesystem info: */ |
1164 | void *journal_info; | |
1da177e4 | 1165 | |
5eca1c10 IM |
1166 | /* Stacked block device info: */ |
1167 | struct bio_list *bio_list; | |
d89d8796 | 1168 | |
5eca1c10 IM |
1169 | /* Stack plugging: */ |
1170 | struct blk_plug *plug; | |
73c10101 | 1171 | |
5eca1c10 IM |
1172 | /* VM state: */ |
1173 | struct reclaim_state *reclaim_state; | |
1174 | ||
1175 | struct backing_dev_info *backing_dev_info; | |
1da177e4 | 1176 | |
5eca1c10 | 1177 | struct io_context *io_context; |
1da177e4 | 1178 | |
5e1f0f09 MG |
1179 | #ifdef CONFIG_COMPACTION |
1180 | struct capture_control *capture_control; | |
1181 | #endif | |
5eca1c10 IM |
1182 | /* Ptrace state: */ |
1183 | unsigned long ptrace_message; | |
ae7795bc | 1184 | kernel_siginfo_t *last_siginfo; |
1da177e4 | 1185 | |
5eca1c10 | 1186 | struct task_io_accounting ioac; |
eb414681 JW |
1187 | #ifdef CONFIG_PSI |
1188 | /* Pressure stall state */ | |
1189 | unsigned int psi_flags; | |
1190 | #endif | |
5eca1c10 IM |
1191 | #ifdef CONFIG_TASK_XACCT |
1192 | /* Accumulated RSS usage: */ | |
1193 | u64 acct_rss_mem1; | |
1194 | /* Accumulated virtual memory usage: */ | |
1195 | u64 acct_vm_mem1; | |
1196 | /* stime + utime since last update: */ | |
1197 | u64 acct_timexpd; | |
1da177e4 LT |
1198 | #endif |
1199 | #ifdef CONFIG_CPUSETS | |
5eca1c10 IM |
1200 | /* Protected by ->alloc_lock: */ |
1201 | nodemask_t mems_allowed; | |
3b03706f | 1202 | /* Sequence number to catch updates: */ |
b7505861 | 1203 | seqcount_spinlock_t mems_allowed_seq; |
5eca1c10 IM |
1204 | int cpuset_mem_spread_rotor; |
1205 | int cpuset_slab_spread_rotor; | |
1da177e4 | 1206 | #endif |
ddbcc7e8 | 1207 | #ifdef CONFIG_CGROUPS |
5eca1c10 IM |
1208 | /* Control Group info protected by css_set_lock: */ |
1209 | struct css_set __rcu *cgroups; | |
1210 | /* cg_list protected by css_set_lock and tsk->alloc_lock: */ | |
1211 | struct list_head cg_list; | |
ddbcc7e8 | 1212 | #endif |
e6d42931 | 1213 | #ifdef CONFIG_X86_CPU_RESCTRL |
0734ded1 | 1214 | u32 closid; |
d6aaba61 | 1215 | u32 rmid; |
e02737d5 | 1216 | #endif |
42b2dd0a | 1217 | #ifdef CONFIG_FUTEX |
5eca1c10 | 1218 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1219 | #ifdef CONFIG_COMPAT |
1220 | struct compat_robust_list_head __user *compat_robust_list; | |
1221 | #endif | |
5eca1c10 IM |
1222 | struct list_head pi_state_list; |
1223 | struct futex_pi_state *pi_state_cache; | |
3f186d97 | 1224 | struct mutex futex_exit_mutex; |
3d4775df | 1225 | unsigned int futex_state; |
c7aceaba | 1226 | #endif |
cdd6c482 | 1227 | #ifdef CONFIG_PERF_EVENTS |
5eca1c10 IM |
1228 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
1229 | struct mutex perf_event_mutex; | |
1230 | struct list_head perf_event_list; | |
a63eaf34 | 1231 | #endif |
8f47b187 | 1232 | #ifdef CONFIG_DEBUG_PREEMPT |
5eca1c10 | 1233 | unsigned long preempt_disable_ip; |
8f47b187 | 1234 | #endif |
c7aceaba | 1235 | #ifdef CONFIG_NUMA |
5eca1c10 IM |
1236 | /* Protected by alloc_lock: */ |
1237 | struct mempolicy *mempolicy; | |
45816682 | 1238 | short il_prev; |
5eca1c10 | 1239 | short pref_node_fork; |
42b2dd0a | 1240 | #endif |
cbee9f88 | 1241 | #ifdef CONFIG_NUMA_BALANCING |
5eca1c10 IM |
1242 | int numa_scan_seq; |
1243 | unsigned int numa_scan_period; | |
1244 | unsigned int numa_scan_period_max; | |
1245 | int numa_preferred_nid; | |
1246 | unsigned long numa_migrate_retry; | |
1247 | /* Migration stamp: */ | |
1248 | u64 node_stamp; | |
1249 | u64 last_task_numa_placement; | |
1250 | u64 last_sum_exec_runtime; | |
1251 | struct callback_head numa_work; | |
1252 | ||
cb361d8c JH |
1253 | /* |
1254 | * This pointer is only modified for current in syscall and | |
1255 | * pagefault context (and for tasks being destroyed), so it can be read | |
1256 | * from any of the following contexts: | |
1257 | * - RCU read-side critical section | |
1258 | * - current->numa_group from everywhere | |
1259 | * - task's runqueue locked, task not running | |
1260 | */ | |
1261 | struct numa_group __rcu *numa_group; | |
8c8a743c | 1262 | |
745d6147 | 1263 | /* |
44dba3d5 IM |
1264 | * numa_faults is an array split into four regions: |
1265 | * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer | |
1266 | * in this precise order. | |
1267 | * | |
1268 | * faults_memory: Exponential decaying average of faults on a per-node | |
1269 | * basis. Scheduling placement decisions are made based on these | |
1270 | * counts. The values remain static for the duration of a PTE scan. | |
1271 | * faults_cpu: Track the nodes the process was running on when a NUMA | |
1272 | * hinting fault was incurred. | |
1273 | * faults_memory_buffer and faults_cpu_buffer: Record faults per node | |
1274 | * during the current scan window. When the scan completes, the counts | |
1275 | * in faults_memory and faults_cpu decay and these values are copied. | |
745d6147 | 1276 | */ |
5eca1c10 IM |
1277 | unsigned long *numa_faults; |
1278 | unsigned long total_numa_faults; | |
745d6147 | 1279 | |
04bb2f94 RR |
1280 | /* |
1281 | * numa_faults_locality tracks if faults recorded during the last | |
074c2381 MG |
1282 | * scan window were remote/local or failed to migrate. The task scan |
1283 | * period is adapted based on the locality of the faults with different | |
1284 | * weights depending on whether they were shared or private faults | |
04bb2f94 | 1285 | */ |
5eca1c10 | 1286 | unsigned long numa_faults_locality[3]; |
04bb2f94 | 1287 | |
5eca1c10 | 1288 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
1289 | #endif /* CONFIG_NUMA_BALANCING */ |
1290 | ||
d7822b1e MD |
1291 | #ifdef CONFIG_RSEQ |
1292 | struct rseq __user *rseq; | |
d7822b1e MD |
1293 | u32 rseq_sig; |
1294 | /* | |
1295 | * RmW on rseq_event_mask must be performed atomically | |
1296 | * with respect to preemption. | |
1297 | */ | |
1298 | unsigned long rseq_event_mask; | |
1299 | #endif | |
1300 | ||
5eca1c10 | 1301 | struct tlbflush_unmap_batch tlb_ubc; |
72b252ae | 1302 | |
3fbd7ee2 EB |
1303 | union { |
1304 | refcount_t rcu_users; | |
1305 | struct rcu_head rcu; | |
1306 | }; | |
b92ce558 | 1307 | |
5eca1c10 IM |
1308 | /* Cache last used pipe for splice(): */ |
1309 | struct pipe_inode_info *splice_pipe; | |
5640f768 | 1310 | |
5eca1c10 | 1311 | struct page_frag task_frag; |
5640f768 | 1312 | |
47913d4e IM |
1313 | #ifdef CONFIG_TASK_DELAY_ACCT |
1314 | struct task_delay_info *delays; | |
f4f154fd | 1315 | #endif |
47913d4e | 1316 | |
f4f154fd | 1317 | #ifdef CONFIG_FAULT_INJECTION |
5eca1c10 | 1318 | int make_it_fail; |
9049f2f6 | 1319 | unsigned int fail_nth; |
ca74e92b | 1320 | #endif |
9d823e8f | 1321 | /* |
5eca1c10 IM |
1322 | * When (nr_dirtied >= nr_dirtied_pause), it's time to call |
1323 | * balance_dirty_pages() for a dirty throttling pause: | |
9d823e8f | 1324 | */ |
5eca1c10 IM |
1325 | int nr_dirtied; |
1326 | int nr_dirtied_pause; | |
1327 | /* Start of a write-and-pause period: */ | |
1328 | unsigned long dirty_paused_when; | |
9d823e8f | 1329 | |
9745512c | 1330 | #ifdef CONFIG_LATENCYTOP |
5eca1c10 IM |
1331 | int latency_record_count; |
1332 | struct latency_record latency_record[LT_SAVECOUNT]; | |
9745512c | 1333 | #endif |
6976675d | 1334 | /* |
5eca1c10 | 1335 | * Time slack values; these are used to round up poll() and |
6976675d AV |
1336 | * select() etc timeout values. These are in nanoseconds. |
1337 | */ | |
5eca1c10 IM |
1338 | u64 timer_slack_ns; |
1339 | u64 default_timer_slack_ns; | |
f8d570a4 | 1340 | |
d73b4936 | 1341 | #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
5eca1c10 | 1342 | unsigned int kasan_depth; |
0b24becc | 1343 | #endif |
92c209ac | 1344 | |
dfd402a4 ME |
1345 | #ifdef CONFIG_KCSAN |
1346 | struct kcsan_ctx kcsan_ctx; | |
92c209ac ME |
1347 | #ifdef CONFIG_TRACE_IRQFLAGS |
1348 | struct irqtrace_events kcsan_save_irqtrace; | |
1349 | #endif | |
69562e49 ME |
1350 | #ifdef CONFIG_KCSAN_WEAK_MEMORY |
1351 | int kcsan_stack_depth; | |
1352 | #endif | |
dfd402a4 | 1353 | #endif |
5eca1c10 | 1354 | |
393824f6 PA |
1355 | #if IS_ENABLED(CONFIG_KUNIT) |
1356 | struct kunit *kunit_test; | |
1357 | #endif | |
1358 | ||
fb52607a | 1359 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
5eca1c10 IM |
1360 | /* Index of current stored address in ret_stack: */ |
1361 | int curr_ret_stack; | |
39eb456d | 1362 | int curr_ret_depth; |
5eca1c10 IM |
1363 | |
1364 | /* Stack of return addresses for return function tracing: */ | |
1365 | struct ftrace_ret_stack *ret_stack; | |
1366 | ||
1367 | /* Timestamp for last schedule: */ | |
1368 | unsigned long long ftrace_timestamp; | |
1369 | ||
f201ae23 FW |
1370 | /* |
1371 | * Number of functions that haven't been traced | |
5eca1c10 | 1372 | * because of depth overrun: |
f201ae23 | 1373 | */ |
5eca1c10 IM |
1374 | atomic_t trace_overrun; |
1375 | ||
1376 | /* Pause tracing: */ | |
1377 | atomic_t tracing_graph_pause; | |
f201ae23 | 1378 | #endif |
5eca1c10 | 1379 | |
ea4e2bc4 | 1380 | #ifdef CONFIG_TRACING |
5eca1c10 IM |
1381 | /* State flags for use by tracers: */ |
1382 | unsigned long trace; | |
1383 | ||
1384 | /* Bitmask and counter of trace recursion: */ | |
1385 | unsigned long trace_recursion; | |
261842b7 | 1386 | #endif /* CONFIG_TRACING */ |
5eca1c10 | 1387 | |
5c9a8750 | 1388 | #ifdef CONFIG_KCOV |
eec028c9 AK |
1389 | /* See kernel/kcov.c for more details. */ |
1390 | ||
5eca1c10 | 1391 | /* Coverage collection mode enabled for this task (0 if disabled): */ |
0ed557aa | 1392 | unsigned int kcov_mode; |
5eca1c10 IM |
1393 | |
1394 | /* Size of the kcov_area: */ | |
1395 | unsigned int kcov_size; | |
1396 | ||
1397 | /* Buffer for coverage collection: */ | |
1398 | void *kcov_area; | |
1399 | ||
1400 | /* KCOV descriptor wired with this task or NULL: */ | |
1401 | struct kcov *kcov; | |
eec028c9 AK |
1402 | |
1403 | /* KCOV common handle for remote coverage collection: */ | |
1404 | u64 kcov_handle; | |
1405 | ||
1406 | /* KCOV sequence number: */ | |
1407 | int kcov_sequence; | |
5ff3b30a AK |
1408 | |
1409 | /* Collect coverage from softirq context: */ | |
1410 | unsigned int kcov_softirq; | |
5c9a8750 | 1411 | #endif |
5eca1c10 | 1412 | |
6f185c29 | 1413 | #ifdef CONFIG_MEMCG |
5eca1c10 IM |
1414 | struct mem_cgroup *memcg_in_oom; |
1415 | gfp_t memcg_oom_gfp_mask; | |
1416 | int memcg_oom_order; | |
b23afb93 | 1417 | |
5eca1c10 IM |
1418 | /* Number of pages to reclaim on returning to userland: */ |
1419 | unsigned int memcg_nr_pages_over_high; | |
d46eb14b SB |
1420 | |
1421 | /* Used by memcontrol for targeted memcg charge: */ | |
1422 | struct mem_cgroup *active_memcg; | |
569b846d | 1423 | #endif |
5eca1c10 | 1424 | |
d09d8df3 JB |
1425 | #ifdef CONFIG_BLK_CGROUP |
1426 | struct request_queue *throttle_queue; | |
1427 | #endif | |
1428 | ||
0326f5a9 | 1429 | #ifdef CONFIG_UPROBES |
5eca1c10 | 1430 | struct uprobe_task *utask; |
0326f5a9 | 1431 | #endif |
cafe5635 | 1432 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
5eca1c10 IM |
1433 | unsigned int sequential_io; |
1434 | unsigned int sequential_io_avg; | |
cafe5635 | 1435 | #endif |
5fbda3ec | 1436 | struct kmap_ctrl kmap_ctrl; |
8eb23b9f | 1437 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
5eca1c10 | 1438 | unsigned long task_state_change; |
5f220be2 TG |
1439 | # ifdef CONFIG_PREEMPT_RT |
1440 | unsigned long saved_state_change; | |
1441 | # endif | |
8eb23b9f | 1442 | #endif |
5eca1c10 | 1443 | int pagefault_disabled; |
03049269 | 1444 | #ifdef CONFIG_MMU |
5eca1c10 | 1445 | struct task_struct *oom_reaper_list; |
03049269 | 1446 | #endif |
ba14a194 | 1447 | #ifdef CONFIG_VMAP_STACK |
5eca1c10 | 1448 | struct vm_struct *stack_vm_area; |
ba14a194 | 1449 | #endif |
68f24b08 | 1450 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
5eca1c10 | 1451 | /* A live task holds one reference: */ |
f0b89d39 | 1452 | refcount_t stack_refcount; |
d83a7cb3 JP |
1453 | #endif |
1454 | #ifdef CONFIG_LIVEPATCH | |
1455 | int patch_state; | |
0302e28d | 1456 | #endif |
e4e55b47 TH |
1457 | #ifdef CONFIG_SECURITY |
1458 | /* Used by LSM modules for access restriction: */ | |
1459 | void *security; | |
68f24b08 | 1460 | #endif |
a10787e6 SL |
1461 | #ifdef CONFIG_BPF_SYSCALL |
1462 | /* Used by BPF task local storage */ | |
1463 | struct bpf_local_storage __rcu *bpf_storage; | |
c7603cfa AN |
1464 | /* Used for BPF run context */ |
1465 | struct bpf_run_ctx *bpf_ctx; | |
a10787e6 | 1466 | #endif |
29e48ce8 | 1467 | |
afaef01c AP |
1468 | #ifdef CONFIG_GCC_PLUGIN_STACKLEAK |
1469 | unsigned long lowest_stack; | |
c8d12627 | 1470 | unsigned long prev_lowest_stack; |
afaef01c AP |
1471 | #endif |
1472 | ||
5567d11c | 1473 | #ifdef CONFIG_X86_MCE |
c0ab7ffc TL |
1474 | void __user *mce_vaddr; |
1475 | __u64 mce_kflags; | |
5567d11c | 1476 | u64 mce_addr; |
17fae129 TL |
1477 | __u64 mce_ripv : 1, |
1478 | mce_whole_page : 1, | |
1479 | __mce_reserved : 62; | |
5567d11c | 1480 | struct callback_head mce_kill_me; |
81065b35 | 1481 | int mce_count; |
5567d11c PZ |
1482 | #endif |
1483 | ||
d741bf41 PZ |
1484 | #ifdef CONFIG_KRETPROBES |
1485 | struct llist_head kretprobe_instances; | |
1486 | #endif | |
54ecbe6f MH |
1487 | #ifdef CONFIG_RETHOOK |
1488 | struct llist_head rethooks; | |
1489 | #endif | |
d741bf41 | 1490 | |
58e106e7 BS |
1491 | #ifdef CONFIG_ARCH_HAS_PARANOID_L1D_FLUSH |
1492 | /* | |
1493 | * If L1D flush is supported on mm context switch | |
1494 | * then we use this callback head to queue kill work | |
1495 | * to kill tasks that are not running on SMT disabled | |
1496 | * cores | |
1497 | */ | |
1498 | struct callback_head l1d_flush_kill; | |
1499 | #endif | |
1500 | ||
29e48ce8 KC |
1501 | /* |
1502 | * New fields for task_struct should be added above here, so that | |
1503 | * they are included in the randomized portion of task_struct. | |
1504 | */ | |
1505 | randomized_struct_fields_end | |
1506 | ||
5eca1c10 IM |
1507 | /* CPU-specific state of this task: */ |
1508 | struct thread_struct thread; | |
1509 | ||
1510 | /* | |
1511 | * WARNING: on x86, 'thread_struct' contains a variable-sized | |
1512 | * structure. It *MUST* be at the end of 'task_struct'. | |
1513 | * | |
1514 | * Do not put anything below here! | |
1515 | */ | |
1da177e4 LT |
1516 | }; |
1517 | ||
e868171a | 1518 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 | 1519 | { |
2c470475 | 1520 | return task->thread_pid; |
22c935f4 EB |
1521 | } |
1522 | ||
7af57294 PE |
1523 | /* |
1524 | * the helpers to get the task's different pids as they are seen | |
1525 | * from various namespaces | |
1526 | * | |
1527 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1528 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1529 | * current. | |
7af57294 PE |
1530 | * task_xid_nr_ns() : id seen from the ns specified; |
1531 | * | |
7af57294 PE |
1532 | * see also pid_nr() etc in include/linux/pid.h |
1533 | */ | |
5eca1c10 | 1534 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns); |
7af57294 | 1535 | |
e868171a | 1536 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1537 | { |
1538 | return tsk->pid; | |
1539 | } | |
1540 | ||
5eca1c10 | 1541 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
52ee2dfd ON |
1542 | { |
1543 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1544 | } | |
7af57294 PE |
1545 | |
1546 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1547 | { | |
52ee2dfd | 1548 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1549 | } |
1550 | ||
1551 | ||
e868171a | 1552 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1553 | { |
1554 | return tsk->tgid; | |
1555 | } | |
1556 | ||
5eca1c10 IM |
1557 | /** |
1558 | * pid_alive - check that a task structure is not stale | |
1559 | * @p: Task structure to be checked. | |
1560 | * | |
1561 | * Test if a process is not yet dead (at most zombie state) | |
1562 | * If pid_alive fails, then pointers within the task structure | |
1563 | * can be stale and must not be dereferenced. | |
1564 | * | |
1565 | * Return: 1 if the process is alive. 0 otherwise. | |
1566 | */ | |
1567 | static inline int pid_alive(const struct task_struct *p) | |
1568 | { | |
2c470475 | 1569 | return p->thread_pid != NULL; |
5eca1c10 | 1570 | } |
7af57294 | 1571 | |
5eca1c10 | 1572 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
7af57294 | 1573 | { |
52ee2dfd | 1574 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1575 | } |
1576 | ||
7af57294 PE |
1577 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1578 | { | |
52ee2dfd | 1579 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1580 | } |
1581 | ||
1582 | ||
5eca1c10 | 1583 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
7af57294 | 1584 | { |
52ee2dfd | 1585 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1586 | } |
1587 | ||
7af57294 PE |
1588 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1589 | { | |
52ee2dfd | 1590 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1591 | } |
1592 | ||
dd1c1f2f ON |
1593 | static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
1594 | { | |
6883f81a | 1595 | return __task_pid_nr_ns(tsk, PIDTYPE_TGID, ns); |
dd1c1f2f ON |
1596 | } |
1597 | ||
1598 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1599 | { | |
6883f81a | 1600 | return __task_pid_nr_ns(tsk, PIDTYPE_TGID, NULL); |
dd1c1f2f ON |
1601 | } |
1602 | ||
1603 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) | |
1604 | { | |
1605 | pid_t pid = 0; | |
1606 | ||
1607 | rcu_read_lock(); | |
1608 | if (pid_alive(tsk)) | |
1609 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1610 | rcu_read_unlock(); | |
1611 | ||
1612 | return pid; | |
1613 | } | |
1614 | ||
1615 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1616 | { | |
1617 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1618 | } | |
1619 | ||
5eca1c10 | 1620 | /* Obsolete, do not use: */ |
1b0f7ffd ON |
1621 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) |
1622 | { | |
1623 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1624 | } | |
7af57294 | 1625 | |
06eb6184 PZ |
1626 | #define TASK_REPORT_IDLE (TASK_REPORT + 1) |
1627 | #define TASK_REPORT_MAX (TASK_REPORT_IDLE << 1) | |
1628 | ||
fa2c3254 VS |
1629 | static inline unsigned int __task_state_index(unsigned int tsk_state, |
1630 | unsigned int tsk_exit_state) | |
20435d84 | 1631 | { |
fa2c3254 | 1632 | unsigned int state = (tsk_state | tsk_exit_state) & TASK_REPORT; |
20435d84 | 1633 | |
06eb6184 PZ |
1634 | BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX); |
1635 | ||
06eb6184 PZ |
1636 | if (tsk_state == TASK_IDLE) |
1637 | state = TASK_REPORT_IDLE; | |
1638 | ||
25795ef6 VS |
1639 | /* |
1640 | * We're lying here, but rather than expose a completely new task state | |
1641 | * to userspace, we can make this appear as if the task has gone through | |
1642 | * a regular rt_mutex_lock() call. | |
1643 | */ | |
1644 | if (tsk_state == TASK_RTLOCK_WAIT) | |
1645 | state = TASK_UNINTERRUPTIBLE; | |
1646 | ||
1593baab PZ |
1647 | return fls(state); |
1648 | } | |
1649 | ||
fa2c3254 VS |
1650 | static inline unsigned int task_state_index(struct task_struct *tsk) |
1651 | { | |
1652 | return __task_state_index(READ_ONCE(tsk->__state), tsk->exit_state); | |
1653 | } | |
1654 | ||
1d48b080 | 1655 | static inline char task_index_to_char(unsigned int state) |
1593baab | 1656 | { |
8ef9925b | 1657 | static const char state_char[] = "RSDTtXZPI"; |
1593baab | 1658 | |
06eb6184 | 1659 | BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1); |
20435d84 | 1660 | |
1593baab PZ |
1661 | return state_char[state]; |
1662 | } | |
1663 | ||
1664 | static inline char task_state_to_char(struct task_struct *tsk) | |
1665 | { | |
1d48b080 | 1666 | return task_index_to_char(task_state_index(tsk)); |
20435d84 XX |
1667 | } |
1668 | ||
f400e198 | 1669 | /** |
570f5241 SS |
1670 | * is_global_init - check if a task structure is init. Since init |
1671 | * is free to have sub-threads we need to check tgid. | |
3260259f H |
1672 | * @tsk: Task structure to be checked. |
1673 | * | |
1674 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1675 | * |
1676 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1677 | */ |
e868171a | 1678 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 | 1679 | { |
570f5241 | 1680 | return task_tgid_nr(tsk) == 1; |
b461cc03 | 1681 | } |
b460cbc5 | 1682 | |
9ec52099 CLG |
1683 | extern struct pid *cad_pid; |
1684 | ||
1da177e4 LT |
1685 | /* |
1686 | * Per process flags | |
1687 | */ | |
01ccf592 | 1688 | #define PF_VCPU 0x00000001 /* I'm a virtual CPU */ |
5eca1c10 IM |
1689 | #define PF_IDLE 0x00000002 /* I am an IDLE thread */ |
1690 | #define PF_EXITING 0x00000004 /* Getting shut down */ | |
92307383 | 1691 | #define PF_POSTCOREDUMP 0x00000008 /* Coredumps should ignore this task */ |
01ccf592 | 1692 | #define PF_IO_WORKER 0x00000010 /* Task is an IO worker */ |
5eca1c10 IM |
1693 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1694 | #define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */ | |
1695 | #define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */ | |
1696 | #define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */ | |
1697 | #define PF_DUMPCORE 0x00000200 /* Dumped core */ | |
1698 | #define PF_SIGNALED 0x00000400 /* Killed by a signal */ | |
1699 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1700 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */ | |
1701 | #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */ | |
5eca1c10 IM |
1702 | #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */ |
1703 | #define PF_FROZEN 0x00010000 /* Frozen for system suspend */ | |
7dea19f9 MH |
1704 | #define PF_KSWAPD 0x00020000 /* I am kswapd */ |
1705 | #define PF_MEMALLOC_NOFS 0x00040000 /* All allocation requests will inherit GFP_NOFS */ | |
1706 | #define PF_MEMALLOC_NOIO 0x00080000 /* All allocation requests will inherit GFP_NOIO */ | |
a37b0715 N |
1707 | #define PF_LOCAL_THROTTLE 0x00100000 /* Throttle writes only against the bdi I write to, |
1708 | * I am cleaning dirty pages from some other bdi. */ | |
5eca1c10 IM |
1709 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
1710 | #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */ | |
3bd37062 | 1711 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */ |
5eca1c10 | 1712 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
1a08ae36 | 1713 | #define PF_MEMALLOC_PIN 0x10000000 /* Allocation context constrained to zones which allow long term pinning. */ |
5eca1c10 IM |
1714 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
1715 | #define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */ | |
1da177e4 LT |
1716 | |
1717 | /* | |
1718 | * Only the _current_ task can read/write to tsk->flags, but other | |
1719 | * tasks can access tsk->flags in readonly mode for example | |
1720 | * with tsk_used_math (like during threaded core dumping). | |
1721 | * There is however an exception to this rule during ptrace | |
1722 | * or during fork: the ptracer task is allowed to write to the | |
1723 | * child->flags of its traced child (same goes for fork, the parent | |
1724 | * can write to the child->flags), because we're guaranteed the | |
1725 | * child is not running and in turn not changing child->flags | |
1726 | * at the same time the parent does it. | |
1727 | */ | |
5eca1c10 IM |
1728 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) |
1729 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1730 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1731 | #define set_used_math() set_stopped_child_used_math(current) | |
1732 | ||
1da177e4 LT |
1733 | #define conditional_stopped_child_used_math(condition, child) \ |
1734 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
5eca1c10 IM |
1735 | |
1736 | #define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current) | |
1737 | ||
1da177e4 LT |
1738 | #define copy_to_stopped_child_used_math(child) \ |
1739 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
5eca1c10 | 1740 | |
1da177e4 | 1741 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ |
5eca1c10 IM |
1742 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) |
1743 | #define used_math() tsk_used_math(current) | |
1da177e4 | 1744 | |
83d40a61 | 1745 | static __always_inline bool is_percpu_thread(void) |
62ec05dd TG |
1746 | { |
1747 | #ifdef CONFIG_SMP | |
1748 | return (current->flags & PF_NO_SETAFFINITY) && | |
1749 | (current->nr_cpus_allowed == 1); | |
1750 | #else | |
1751 | return true; | |
1752 | #endif | |
1753 | } | |
1754 | ||
1d4457f9 | 1755 | /* Per-process atomic flags. */ |
5eca1c10 IM |
1756 | #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ |
1757 | #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ | |
1758 | #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ | |
356e4bff TG |
1759 | #define PFA_SPEC_SSB_DISABLE 3 /* Speculative Store Bypass disabled */ |
1760 | #define PFA_SPEC_SSB_FORCE_DISABLE 4 /* Speculative Store Bypass force disabled*/ | |
9137bb27 TG |
1761 | #define PFA_SPEC_IB_DISABLE 5 /* Indirect branch speculation restricted */ |
1762 | #define PFA_SPEC_IB_FORCE_DISABLE 6 /* Indirect branch speculation permanently restricted */ | |
71368af9 | 1763 | #define PFA_SPEC_SSB_NOEXEC 7 /* Speculative Store Bypass clear on execve() */ |
1d4457f9 | 1764 | |
e0e5070b ZL |
1765 | #define TASK_PFA_TEST(name, func) \ |
1766 | static inline bool task_##func(struct task_struct *p) \ | |
1767 | { return test_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1768 | |
e0e5070b ZL |
1769 | #define TASK_PFA_SET(name, func) \ |
1770 | static inline void task_set_##func(struct task_struct *p) \ | |
1771 | { set_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1772 | |
e0e5070b ZL |
1773 | #define TASK_PFA_CLEAR(name, func) \ |
1774 | static inline void task_clear_##func(struct task_struct *p) \ | |
1775 | { clear_bit(PFA_##name, &p->atomic_flags); } | |
1776 | ||
1777 | TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) | |
1778 | TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) | |
1d4457f9 | 1779 | |
2ad654bc ZL |
1780 | TASK_PFA_TEST(SPREAD_PAGE, spread_page) |
1781 | TASK_PFA_SET(SPREAD_PAGE, spread_page) | |
1782 | TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) | |
1783 | ||
1784 | TASK_PFA_TEST(SPREAD_SLAB, spread_slab) | |
1785 | TASK_PFA_SET(SPREAD_SLAB, spread_slab) | |
1786 | TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) | |
1d4457f9 | 1787 | |
356e4bff TG |
1788 | TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable) |
1789 | TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable) | |
1790 | TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable) | |
1791 | ||
71368af9 WL |
1792 | TASK_PFA_TEST(SPEC_SSB_NOEXEC, spec_ssb_noexec) |
1793 | TASK_PFA_SET(SPEC_SSB_NOEXEC, spec_ssb_noexec) | |
1794 | TASK_PFA_CLEAR(SPEC_SSB_NOEXEC, spec_ssb_noexec) | |
1795 | ||
356e4bff TG |
1796 | TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) |
1797 | TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) | |
1798 | ||
9137bb27 TG |
1799 | TASK_PFA_TEST(SPEC_IB_DISABLE, spec_ib_disable) |
1800 | TASK_PFA_SET(SPEC_IB_DISABLE, spec_ib_disable) | |
1801 | TASK_PFA_CLEAR(SPEC_IB_DISABLE, spec_ib_disable) | |
1802 | ||
1803 | TASK_PFA_TEST(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable) | |
1804 | TASK_PFA_SET(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable) | |
1805 | ||
5eca1c10 | 1806 | static inline void |
717a94b5 | 1807 | current_restore_flags(unsigned long orig_flags, unsigned long flags) |
907aed48 | 1808 | { |
717a94b5 N |
1809 | current->flags &= ~flags; |
1810 | current->flags |= orig_flags & flags; | |
907aed48 MG |
1811 | } |
1812 | ||
5eca1c10 IM |
1813 | extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial); |
1814 | extern int task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed); | |
1da177e4 | 1815 | #ifdef CONFIG_SMP |
5eca1c10 IM |
1816 | extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask); |
1817 | extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask); | |
b90ca8ba WD |
1818 | extern int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node); |
1819 | extern void release_user_cpus_ptr(struct task_struct *p); | |
234b8ab6 | 1820 | extern int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask); |
07ec77a1 WD |
1821 | extern void force_compatible_cpus_allowed_ptr(struct task_struct *p); |
1822 | extern void relax_compatible_cpus_allowed_ptr(struct task_struct *p); | |
1da177e4 | 1823 | #else |
5eca1c10 | 1824 | static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) |
1e1b6c51 KM |
1825 | { |
1826 | } | |
5eca1c10 | 1827 | static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask) |
1da177e4 | 1828 | { |
96f874e2 | 1829 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1830 | return -EINVAL; |
1831 | return 0; | |
1832 | } | |
b90ca8ba WD |
1833 | static inline int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node) |
1834 | { | |
1835 | if (src->user_cpus_ptr) | |
1836 | return -EINVAL; | |
1837 | return 0; | |
1838 | } | |
1839 | static inline void release_user_cpus_ptr(struct task_struct *p) | |
1840 | { | |
1841 | WARN_ON(p->user_cpus_ptr); | |
1842 | } | |
234b8ab6 WD |
1843 | |
1844 | static inline int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask) | |
1845 | { | |
1846 | return 0; | |
1847 | } | |
1da177e4 | 1848 | #endif |
e0ad9556 | 1849 | |
fa93384f | 1850 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
1851 | extern void set_user_nice(struct task_struct *p, long nice); |
1852 | extern int task_prio(const struct task_struct *p); | |
5eca1c10 | 1853 | |
d0ea0268 DY |
1854 | /** |
1855 | * task_nice - return the nice value of a given task. | |
1856 | * @p: the task in question. | |
1857 | * | |
1858 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
1859 | */ | |
1860 | static inline int task_nice(const struct task_struct *p) | |
1861 | { | |
1862 | return PRIO_TO_NICE((p)->static_prio); | |
1863 | } | |
5eca1c10 | 1864 | |
36c8b586 IM |
1865 | extern int can_nice(const struct task_struct *p, const int nice); |
1866 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 1867 | extern int idle_cpu(int cpu); |
943d355d | 1868 | extern int available_idle_cpu(int cpu); |
5eca1c10 IM |
1869 | extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *); |
1870 | extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *); | |
8b700983 PZ |
1871 | extern void sched_set_fifo(struct task_struct *p); |
1872 | extern void sched_set_fifo_low(struct task_struct *p); | |
1873 | extern void sched_set_normal(struct task_struct *p, int nice); | |
5eca1c10 | 1874 | extern int sched_setattr(struct task_struct *, const struct sched_attr *); |
794a56eb | 1875 | extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *); |
36c8b586 | 1876 | extern struct task_struct *idle_task(int cpu); |
5eca1c10 | 1877 | |
c4f30608 PM |
1878 | /** |
1879 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 1880 | * @p: the task in question. |
e69f6186 YB |
1881 | * |
1882 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 1883 | */ |
c94a88f3 | 1884 | static __always_inline bool is_idle_task(const struct task_struct *p) |
c4f30608 | 1885 | { |
c1de45ca | 1886 | return !!(p->flags & PF_IDLE); |
c4f30608 | 1887 | } |
5eca1c10 | 1888 | |
36c8b586 | 1889 | extern struct task_struct *curr_task(int cpu); |
a458ae2e | 1890 | extern void ia64_set_curr_task(int cpu, struct task_struct *p); |
1da177e4 LT |
1891 | |
1892 | void yield(void); | |
1893 | ||
1da177e4 | 1894 | union thread_union { |
0500871f DH |
1895 | #ifndef CONFIG_ARCH_TASK_STRUCT_ON_STACK |
1896 | struct task_struct task; | |
1897 | #endif | |
c65eacbe | 1898 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1da177e4 | 1899 | struct thread_info thread_info; |
c65eacbe | 1900 | #endif |
1da177e4 LT |
1901 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
1902 | }; | |
1903 | ||
0500871f DH |
1904 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1905 | extern struct thread_info init_thread_info; | |
1906 | #endif | |
1907 | ||
1908 | extern unsigned long init_stack[THREAD_SIZE / sizeof(unsigned long)]; | |
1909 | ||
f3ac6067 | 1910 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
bcf9033e | 1911 | # define task_thread_info(task) (&(task)->thread_info) |
f3ac6067 IM |
1912 | #elif !defined(__HAVE_THREAD_FUNCTIONS) |
1913 | # define task_thread_info(task) ((struct thread_info *)(task)->stack) | |
1914 | #endif | |
1915 | ||
198fe21b PE |
1916 | /* |
1917 | * find a task by one of its numerical ids | |
1918 | * | |
198fe21b PE |
1919 | * find_task_by_pid_ns(): |
1920 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1921 | * find_task_by_vpid(): |
1922 | * finds a task by its virtual pid | |
198fe21b | 1923 | * |
e49859e7 | 1924 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
1925 | */ |
1926 | ||
228ebcbe | 1927 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
5eca1c10 | 1928 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns); |
198fe21b | 1929 | |
2ee08260 MR |
1930 | /* |
1931 | * find a task by its virtual pid and get the task struct | |
1932 | */ | |
1933 | extern struct task_struct *find_get_task_by_vpid(pid_t nr); | |
1934 | ||
b3c97528 HH |
1935 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
1936 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 1937 | extern void wake_up_new_task(struct task_struct *tsk); |
5eca1c10 | 1938 | |
1da177e4 | 1939 | #ifdef CONFIG_SMP |
5eca1c10 | 1940 | extern void kick_process(struct task_struct *tsk); |
1da177e4 | 1941 | #else |
5eca1c10 | 1942 | static inline void kick_process(struct task_struct *tsk) { } |
1da177e4 | 1943 | #endif |
1da177e4 | 1944 | |
82b89778 | 1945 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
5eca1c10 | 1946 | |
82b89778 AH |
1947 | static inline void set_task_comm(struct task_struct *tsk, const char *from) |
1948 | { | |
1949 | __set_task_comm(tsk, from, false); | |
1950 | } | |
5eca1c10 | 1951 | |
3756f640 AB |
1952 | extern char *__get_task_comm(char *to, size_t len, struct task_struct *tsk); |
1953 | #define get_task_comm(buf, tsk) ({ \ | |
1954 | BUILD_BUG_ON(sizeof(buf) != TASK_COMM_LEN); \ | |
1955 | __get_task_comm(buf, sizeof(buf), tsk); \ | |
1956 | }) | |
1da177e4 LT |
1957 | |
1958 | #ifdef CONFIG_SMP | |
2a0a24eb TG |
1959 | static __always_inline void scheduler_ipi(void) |
1960 | { | |
1961 | /* | |
1962 | * Fold TIF_NEED_RESCHED into the preempt_count; anybody setting | |
1963 | * TIF_NEED_RESCHED remotely (for the first time) will also send | |
1964 | * this IPI. | |
1965 | */ | |
1966 | preempt_fold_need_resched(); | |
1967 | } | |
2f064a59 | 1968 | extern unsigned long wait_task_inactive(struct task_struct *, unsigned int match_state); |
1da177e4 | 1969 | #else |
184748cc | 1970 | static inline void scheduler_ipi(void) { } |
2f064a59 | 1971 | static inline unsigned long wait_task_inactive(struct task_struct *p, unsigned int match_state) |
85ba2d86 RM |
1972 | { |
1973 | return 1; | |
1974 | } | |
1da177e4 LT |
1975 | #endif |
1976 | ||
5eca1c10 IM |
1977 | /* |
1978 | * Set thread flags in other task's structures. | |
1979 | * See asm/thread_info.h for TIF_xxxx flags available: | |
1da177e4 LT |
1980 | */ |
1981 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1982 | { | |
a1261f54 | 1983 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1984 | } |
1985 | ||
1986 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1987 | { | |
a1261f54 | 1988 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1989 | } |
1990 | ||
93ee37c2 DM |
1991 | static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag, |
1992 | bool value) | |
1993 | { | |
1994 | update_ti_thread_flag(task_thread_info(tsk), flag, value); | |
1995 | } | |
1996 | ||
1da177e4 LT |
1997 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
1998 | { | |
a1261f54 | 1999 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2000 | } |
2001 | ||
2002 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2003 | { | |
a1261f54 | 2004 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2005 | } |
2006 | ||
2007 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2008 | { | |
a1261f54 | 2009 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2010 | } |
2011 | ||
2012 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2013 | { | |
2014 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2015 | } | |
2016 | ||
2017 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2018 | { | |
2019 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2020 | } | |
2021 | ||
8ae121ac GH |
2022 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2023 | { | |
2024 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2025 | } | |
2026 | ||
1da177e4 LT |
2027 | /* |
2028 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2029 | * explicit rescheduling in places that are safe. The return | |
2030 | * value indicates whether a reschedule was done in fact. | |
2031 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1da177e4 | 2032 | */ |
b965f1dd PZI |
2033 | #if !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC) |
2034 | extern int __cond_resched(void); | |
2035 | ||
99cf983c | 2036 | #if defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_CALL) |
b965f1dd PZI |
2037 | |
2038 | DECLARE_STATIC_CALL(cond_resched, __cond_resched); | |
2039 | ||
2040 | static __always_inline int _cond_resched(void) | |
2041 | { | |
ef72661e | 2042 | return static_call_mod(cond_resched)(); |
b965f1dd PZI |
2043 | } |
2044 | ||
99cf983c MR |
2045 | #elif defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY) |
2046 | extern int dynamic_cond_resched(void); | |
2047 | ||
2048 | static __always_inline int _cond_resched(void) | |
2049 | { | |
2050 | return dynamic_cond_resched(); | |
2051 | } | |
2052 | ||
35a773a0 | 2053 | #else |
b965f1dd PZI |
2054 | |
2055 | static inline int _cond_resched(void) | |
2056 | { | |
2057 | return __cond_resched(); | |
2058 | } | |
2059 | ||
2060 | #endif /* CONFIG_PREEMPT_DYNAMIC */ | |
2061 | ||
2062 | #else | |
2063 | ||
35a773a0 | 2064 | static inline int _cond_resched(void) { return 0; } |
b965f1dd PZI |
2065 | |
2066 | #endif /* !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC) */ | |
6f80bd98 | 2067 | |
613afbf8 | 2068 | #define cond_resched() ({ \ |
874f670e | 2069 | __might_resched(__FILE__, __LINE__, 0); \ |
613afbf8 FW |
2070 | _cond_resched(); \ |
2071 | }) | |
6f80bd98 | 2072 | |
613afbf8 | 2073 | extern int __cond_resched_lock(spinlock_t *lock); |
f3d4b4b1 BG |
2074 | extern int __cond_resched_rwlock_read(rwlock_t *lock); |
2075 | extern int __cond_resched_rwlock_write(rwlock_t *lock); | |
613afbf8 | 2076 | |
50e081b9 TG |
2077 | #define MIGHT_RESCHED_RCU_SHIFT 8 |
2078 | #define MIGHT_RESCHED_PREEMPT_MASK ((1U << MIGHT_RESCHED_RCU_SHIFT) - 1) | |
2079 | ||
3e9cc688 TG |
2080 | #ifndef CONFIG_PREEMPT_RT |
2081 | /* | |
2082 | * Non RT kernels have an elevated preempt count due to the held lock, | |
2083 | * but are not allowed to be inside a RCU read side critical section | |
2084 | */ | |
2085 | # define PREEMPT_LOCK_RESCHED_OFFSETS PREEMPT_LOCK_OFFSET | |
2086 | #else | |
2087 | /* | |
2088 | * spin/rw_lock() on RT implies rcu_read_lock(). The might_sleep() check in | |
2089 | * cond_resched*lock() has to take that into account because it checks for | |
2090 | * preempt_count() and rcu_preempt_depth(). | |
2091 | */ | |
2092 | # define PREEMPT_LOCK_RESCHED_OFFSETS \ | |
2093 | (PREEMPT_LOCK_OFFSET + (1U << MIGHT_RESCHED_RCU_SHIFT)) | |
2094 | #endif | |
2095 | ||
2096 | #define cond_resched_lock(lock) ({ \ | |
2097 | __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \ | |
2098 | __cond_resched_lock(lock); \ | |
613afbf8 FW |
2099 | }) |
2100 | ||
3e9cc688 TG |
2101 | #define cond_resched_rwlock_read(lock) ({ \ |
2102 | __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \ | |
2103 | __cond_resched_rwlock_read(lock); \ | |
f3d4b4b1 BG |
2104 | }) |
2105 | ||
3e9cc688 TG |
2106 | #define cond_resched_rwlock_write(lock) ({ \ |
2107 | __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \ | |
2108 | __cond_resched_rwlock_write(lock); \ | |
f3d4b4b1 BG |
2109 | }) |
2110 | ||
f6f3c437 SH |
2111 | static inline void cond_resched_rcu(void) |
2112 | { | |
2113 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
2114 | rcu_read_unlock(); | |
2115 | cond_resched(); | |
2116 | rcu_read_lock(); | |
2117 | #endif | |
2118 | } | |
2119 | ||
1da177e4 LT |
2120 | /* |
2121 | * Does a critical section need to be broken due to another | |
c1a280b6 | 2122 | * task waiting?: (technically does not depend on CONFIG_PREEMPTION, |
95c354fe | 2123 | * but a general need for low latency) |
1da177e4 | 2124 | */ |
95c354fe | 2125 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2126 | { |
c1a280b6 | 2127 | #ifdef CONFIG_PREEMPTION |
95c354fe NP |
2128 | return spin_is_contended(lock); |
2129 | #else | |
1da177e4 | 2130 | return 0; |
95c354fe | 2131 | #endif |
1da177e4 LT |
2132 | } |
2133 | ||
a09a689a BG |
2134 | /* |
2135 | * Check if a rwlock is contended. | |
2136 | * Returns non-zero if there is another task waiting on the rwlock. | |
2137 | * Returns zero if the lock is not contended or the system / underlying | |
2138 | * rwlock implementation does not support contention detection. | |
2139 | * Technically does not depend on CONFIG_PREEMPTION, but a general need | |
2140 | * for low latency. | |
2141 | */ | |
2142 | static inline int rwlock_needbreak(rwlock_t *lock) | |
2143 | { | |
2144 | #ifdef CONFIG_PREEMPTION | |
2145 | return rwlock_is_contended(lock); | |
2146 | #else | |
2147 | return 0; | |
2148 | #endif | |
2149 | } | |
2150 | ||
75f93fed PZ |
2151 | static __always_inline bool need_resched(void) |
2152 | { | |
2153 | return unlikely(tif_need_resched()); | |
2154 | } | |
2155 | ||
1da177e4 LT |
2156 | /* |
2157 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2158 | */ | |
2159 | #ifdef CONFIG_SMP | |
2160 | ||
2161 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2162 | { | |
c546951d | 2163 | return READ_ONCE(task_thread_info(p)->cpu); |
1da177e4 LT |
2164 | } |
2165 | ||
c65cc870 | 2166 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2167 | |
2168 | #else | |
2169 | ||
2170 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2171 | { | |
2172 | return 0; | |
2173 | } | |
2174 | ||
2175 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2176 | { | |
2177 | } | |
2178 | ||
2179 | #endif /* CONFIG_SMP */ | |
2180 | ||
a1dfb631 | 2181 | extern bool sched_task_on_rq(struct task_struct *p); |
42a20f86 | 2182 | extern unsigned long get_wchan(struct task_struct *p); |
a1dfb631 | 2183 | |
d9345c65 PX |
2184 | /* |
2185 | * In order to reduce various lock holder preemption latencies provide an | |
2186 | * interface to see if a vCPU is currently running or not. | |
2187 | * | |
2188 | * This allows us to terminate optimistic spin loops and block, analogous to | |
2189 | * the native optimistic spin heuristic of testing if the lock owner task is | |
2190 | * running or not. | |
2191 | */ | |
2192 | #ifndef vcpu_is_preempted | |
42fd8baa QC |
2193 | static inline bool vcpu_is_preempted(int cpu) |
2194 | { | |
2195 | return false; | |
2196 | } | |
d9345c65 PX |
2197 | #endif |
2198 | ||
96f874e2 RR |
2199 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2200 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2201 | |
82455257 DH |
2202 | #ifndef TASK_SIZE_OF |
2203 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2204 | #endif | |
2205 | ||
a5418be9 | 2206 | #ifdef CONFIG_SMP |
c0bed69d KW |
2207 | static inline bool owner_on_cpu(struct task_struct *owner) |
2208 | { | |
2209 | /* | |
2210 | * As lock holder preemption issue, we both skip spinning if | |
2211 | * task is not on cpu or its cpu is preempted | |
2212 | */ | |
4cf75fd4 | 2213 | return READ_ONCE(owner->on_cpu) && !vcpu_is_preempted(task_cpu(owner)); |
c0bed69d KW |
2214 | } |
2215 | ||
a5418be9 VK |
2216 | /* Returns effective CPU energy utilization, as seen by the scheduler */ |
2217 | unsigned long sched_cpu_util(int cpu, unsigned long max); | |
2218 | #endif /* CONFIG_SMP */ | |
2219 | ||
d7822b1e MD |
2220 | #ifdef CONFIG_RSEQ |
2221 | ||
2222 | /* | |
2223 | * Map the event mask on the user-space ABI enum rseq_cs_flags | |
2224 | * for direct mask checks. | |
2225 | */ | |
2226 | enum rseq_event_mask_bits { | |
2227 | RSEQ_EVENT_PREEMPT_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT, | |
2228 | RSEQ_EVENT_SIGNAL_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT, | |
2229 | RSEQ_EVENT_MIGRATE_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT, | |
2230 | }; | |
2231 | ||
2232 | enum rseq_event_mask { | |
2233 | RSEQ_EVENT_PREEMPT = (1U << RSEQ_EVENT_PREEMPT_BIT), | |
2234 | RSEQ_EVENT_SIGNAL = (1U << RSEQ_EVENT_SIGNAL_BIT), | |
2235 | RSEQ_EVENT_MIGRATE = (1U << RSEQ_EVENT_MIGRATE_BIT), | |
2236 | }; | |
2237 | ||
2238 | static inline void rseq_set_notify_resume(struct task_struct *t) | |
2239 | { | |
2240 | if (t->rseq) | |
2241 | set_tsk_thread_flag(t, TIF_NOTIFY_RESUME); | |
2242 | } | |
2243 | ||
784e0300 | 2244 | void __rseq_handle_notify_resume(struct ksignal *sig, struct pt_regs *regs); |
d7822b1e | 2245 | |
784e0300 WD |
2246 | static inline void rseq_handle_notify_resume(struct ksignal *ksig, |
2247 | struct pt_regs *regs) | |
d7822b1e MD |
2248 | { |
2249 | if (current->rseq) | |
784e0300 | 2250 | __rseq_handle_notify_resume(ksig, regs); |
d7822b1e MD |
2251 | } |
2252 | ||
784e0300 WD |
2253 | static inline void rseq_signal_deliver(struct ksignal *ksig, |
2254 | struct pt_regs *regs) | |
d7822b1e MD |
2255 | { |
2256 | preempt_disable(); | |
2257 | __set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask); | |
2258 | preempt_enable(); | |
784e0300 | 2259 | rseq_handle_notify_resume(ksig, regs); |
d7822b1e MD |
2260 | } |
2261 | ||
2262 | /* rseq_preempt() requires preemption to be disabled. */ | |
2263 | static inline void rseq_preempt(struct task_struct *t) | |
2264 | { | |
2265 | __set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask); | |
2266 | rseq_set_notify_resume(t); | |
2267 | } | |
2268 | ||
2269 | /* rseq_migrate() requires preemption to be disabled. */ | |
2270 | static inline void rseq_migrate(struct task_struct *t) | |
2271 | { | |
2272 | __set_bit(RSEQ_EVENT_MIGRATE_BIT, &t->rseq_event_mask); | |
2273 | rseq_set_notify_resume(t); | |
2274 | } | |
2275 | ||
2276 | /* | |
2277 | * If parent process has a registered restartable sequences area, the | |
463f550f | 2278 | * child inherits. Unregister rseq for a clone with CLONE_VM set. |
d7822b1e MD |
2279 | */ |
2280 | static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) | |
2281 | { | |
463f550f | 2282 | if (clone_flags & CLONE_VM) { |
d7822b1e | 2283 | t->rseq = NULL; |
d7822b1e MD |
2284 | t->rseq_sig = 0; |
2285 | t->rseq_event_mask = 0; | |
2286 | } else { | |
2287 | t->rseq = current->rseq; | |
d7822b1e MD |
2288 | t->rseq_sig = current->rseq_sig; |
2289 | t->rseq_event_mask = current->rseq_event_mask; | |
d7822b1e MD |
2290 | } |
2291 | } | |
2292 | ||
2293 | static inline void rseq_execve(struct task_struct *t) | |
2294 | { | |
2295 | t->rseq = NULL; | |
d7822b1e MD |
2296 | t->rseq_sig = 0; |
2297 | t->rseq_event_mask = 0; | |
2298 | } | |
2299 | ||
2300 | #else | |
2301 | ||
2302 | static inline void rseq_set_notify_resume(struct task_struct *t) | |
2303 | { | |
2304 | } | |
784e0300 WD |
2305 | static inline void rseq_handle_notify_resume(struct ksignal *ksig, |
2306 | struct pt_regs *regs) | |
d7822b1e MD |
2307 | { |
2308 | } | |
784e0300 WD |
2309 | static inline void rseq_signal_deliver(struct ksignal *ksig, |
2310 | struct pt_regs *regs) | |
d7822b1e MD |
2311 | { |
2312 | } | |
2313 | static inline void rseq_preempt(struct task_struct *t) | |
2314 | { | |
2315 | } | |
2316 | static inline void rseq_migrate(struct task_struct *t) | |
2317 | { | |
2318 | } | |
2319 | static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) | |
2320 | { | |
2321 | } | |
2322 | static inline void rseq_execve(struct task_struct *t) | |
2323 | { | |
2324 | } | |
2325 | ||
2326 | #endif | |
2327 | ||
2328 | #ifdef CONFIG_DEBUG_RSEQ | |
2329 | ||
2330 | void rseq_syscall(struct pt_regs *regs); | |
2331 | ||
2332 | #else | |
2333 | ||
2334 | static inline void rseq_syscall(struct pt_regs *regs) | |
2335 | { | |
2336 | } | |
2337 | ||
2338 | #endif | |
2339 | ||
3c93a0c0 QY |
2340 | const struct sched_avg *sched_trace_cfs_rq_avg(struct cfs_rq *cfs_rq); |
2341 | char *sched_trace_cfs_rq_path(struct cfs_rq *cfs_rq, char *str, int len); | |
2342 | int sched_trace_cfs_rq_cpu(struct cfs_rq *cfs_rq); | |
2343 | ||
2344 | const struct sched_avg *sched_trace_rq_avg_rt(struct rq *rq); | |
2345 | const struct sched_avg *sched_trace_rq_avg_dl(struct rq *rq); | |
2346 | const struct sched_avg *sched_trace_rq_avg_irq(struct rq *rq); | |
2347 | ||
2348 | int sched_trace_rq_cpu(struct rq *rq); | |
51cf18c9 | 2349 | int sched_trace_rq_cpu_capacity(struct rq *rq); |
9d246053 | 2350 | int sched_trace_rq_nr_running(struct rq *rq); |
3c93a0c0 QY |
2351 | |
2352 | const struct cpumask *sched_trace_rd_span(struct root_domain *rd); | |
2353 | ||
6e33cad0 PZ |
2354 | #ifdef CONFIG_SCHED_CORE |
2355 | extern void sched_core_free(struct task_struct *tsk); | |
85dd3f61 | 2356 | extern void sched_core_fork(struct task_struct *p); |
7ac592aa CH |
2357 | extern int sched_core_share_pid(unsigned int cmd, pid_t pid, enum pid_type type, |
2358 | unsigned long uaddr); | |
6e33cad0 PZ |
2359 | #else |
2360 | static inline void sched_core_free(struct task_struct *tsk) { } | |
85dd3f61 | 2361 | static inline void sched_core_fork(struct task_struct *p) { } |
6e33cad0 PZ |
2362 | #endif |
2363 | ||
1da177e4 | 2364 | #endif |