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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_SCHED_H |
3 | #define _LINUX_SCHED_H | |
4 | ||
5eca1c10 IM |
5 | /* |
6 | * Define 'struct task_struct' and provide the main scheduler | |
7 | * APIs (schedule(), wakeup variants, etc.) | |
8 | */ | |
b7b3c76a | 9 | |
5eca1c10 | 10 | #include <uapi/linux/sched.h> |
5c228079 | 11 | |
5eca1c10 | 12 | #include <asm/current.h> |
1da177e4 | 13 | |
5eca1c10 | 14 | #include <linux/pid.h> |
1da177e4 | 15 | #include <linux/sem.h> |
ab602f79 | 16 | #include <linux/shm.h> |
5eca1c10 IM |
17 | #include <linux/mutex.h> |
18 | #include <linux/plist.h> | |
19 | #include <linux/hrtimer.h> | |
0584df9c | 20 | #include <linux/irqflags.h> |
1da177e4 | 21 | #include <linux/seccomp.h> |
5eca1c10 | 22 | #include <linux/nodemask.h> |
b68070e1 | 23 | #include <linux/rcupdate.h> |
ec1d2819 | 24 | #include <linux/refcount.h> |
a3b6714e | 25 | #include <linux/resource.h> |
9745512c | 26 | #include <linux/latencytop.h> |
5eca1c10 | 27 | #include <linux/sched/prio.h> |
9eacb5c7 | 28 | #include <linux/sched/types.h> |
5eca1c10 | 29 | #include <linux/signal_types.h> |
1446e1df | 30 | #include <linux/syscall_user_dispatch.h> |
5eca1c10 IM |
31 | #include <linux/mm_types_task.h> |
32 | #include <linux/task_io_accounting.h> | |
2b69942f | 33 | #include <linux/posix-timers.h> |
d7822b1e | 34 | #include <linux/rseq.h> |
0cd39f46 | 35 | #include <linux/seqlock.h> |
dfd402a4 | 36 | #include <linux/kcsan.h> |
102227b9 | 37 | #include <linux/rv.h> |
5fbda3ec | 38 | #include <asm/kmap_size.h> |
a3b6714e | 39 | |
5eca1c10 | 40 | /* task_struct member predeclarations (sorted alphabetically): */ |
c7af7877 | 41 | struct audit_context; |
c7af7877 | 42 | struct backing_dev_info; |
bddd87c7 | 43 | struct bio_list; |
73c10101 | 44 | struct blk_plug; |
a10787e6 | 45 | struct bpf_local_storage; |
c7603cfa | 46 | struct bpf_run_ctx; |
3c93a0c0 | 47 | struct capture_control; |
c7af7877 | 48 | struct cfs_rq; |
c7af7877 IM |
49 | struct fs_struct; |
50 | struct futex_pi_state; | |
51 | struct io_context; | |
1875dc5b | 52 | struct io_uring_task; |
c7af7877 | 53 | struct mempolicy; |
89076bc3 | 54 | struct nameidata; |
c7af7877 IM |
55 | struct nsproxy; |
56 | struct perf_event_context; | |
57 | struct pid_namespace; | |
58 | struct pipe_inode_info; | |
59 | struct rcu_node; | |
60 | struct reclaim_state; | |
61 | struct robust_list_head; | |
3c93a0c0 QY |
62 | struct root_domain; |
63 | struct rq; | |
c7af7877 IM |
64 | struct sched_attr; |
65 | struct sched_param; | |
43ae34cb | 66 | struct seq_file; |
c7af7877 IM |
67 | struct sighand_struct; |
68 | struct signal_struct; | |
69 | struct task_delay_info; | |
4cf86d77 | 70 | struct task_group; |
1da177e4 | 71 | |
4a8342d2 LT |
72 | /* |
73 | * Task state bitmask. NOTE! These bits are also | |
74 | * encoded in fs/proc/array.c: get_task_state(). | |
75 | * | |
76 | * We have two separate sets of flags: task->state | |
77 | * is about runnability, while task->exit_state are | |
78 | * about the task exiting. Confusing, but this way | |
79 | * modifying one set can't modify the other one by | |
80 | * mistake. | |
81 | */ | |
5eca1c10 IM |
82 | |
83 | /* Used in tsk->state: */ | |
92c4bc9f PZ |
84 | #define TASK_RUNNING 0x0000 |
85 | #define TASK_INTERRUPTIBLE 0x0001 | |
86 | #define TASK_UNINTERRUPTIBLE 0x0002 | |
87 | #define __TASK_STOPPED 0x0004 | |
88 | #define __TASK_TRACED 0x0008 | |
5eca1c10 | 89 | /* Used in tsk->exit_state: */ |
92c4bc9f PZ |
90 | #define EXIT_DEAD 0x0010 |
91 | #define EXIT_ZOMBIE 0x0020 | |
5eca1c10 IM |
92 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) |
93 | /* Used in tsk->state again: */ | |
8ef9925b PZ |
94 | #define TASK_PARKED 0x0040 |
95 | #define TASK_DEAD 0x0080 | |
96 | #define TASK_WAKEKILL 0x0100 | |
97 | #define TASK_WAKING 0x0200 | |
92c4bc9f PZ |
98 | #define TASK_NOLOAD 0x0400 |
99 | #define TASK_NEW 0x0800 | |
cd781d0c TG |
100 | /* RT specific auxilliary flag to mark RT lock waiters */ |
101 | #define TASK_RTLOCK_WAIT 0x1000 | |
102 | #define TASK_STATE_MAX 0x2000 | |
5eca1c10 | 103 | |
5eca1c10 IM |
104 | /* Convenience macros for the sake of set_current_state: */ |
105 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
106 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
2500ad1c | 107 | #define TASK_TRACED __TASK_TRACED |
5eca1c10 IM |
108 | |
109 | #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD) | |
110 | ||
111 | /* Convenience macros for the sake of wake_up(): */ | |
112 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
5eca1c10 IM |
113 | |
114 | /* get_task_state(): */ | |
115 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
116 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ | |
8ef9925b PZ |
117 | __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \ |
118 | TASK_PARKED) | |
5eca1c10 | 119 | |
2f064a59 | 120 | #define task_is_running(task) (READ_ONCE((task)->__state) == TASK_RUNNING) |
5eca1c10 | 121 | |
31cae1ea PZ |
122 | #define task_is_traced(task) ((READ_ONCE(task->jobctl) & JOBCTL_TRACED) != 0) |
123 | #define task_is_stopped(task) ((READ_ONCE(task->jobctl) & JOBCTL_STOPPED) != 0) | |
124 | #define task_is_stopped_or_traced(task) ((READ_ONCE(task->jobctl) & (JOBCTL_STOPPED | JOBCTL_TRACED)) != 0) | |
5eca1c10 | 125 | |
b5bf9a90 PZ |
126 | /* |
127 | * Special states are those that do not use the normal wait-loop pattern. See | |
128 | * the comment with set_special_state(). | |
129 | */ | |
130 | #define is_special_task_state(state) \ | |
1cef1150 | 131 | ((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD)) |
b5bf9a90 | 132 | |
85019c16 TG |
133 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
134 | # define debug_normal_state_change(state_value) \ | |
135 | do { \ | |
136 | WARN_ON_ONCE(is_special_task_state(state_value)); \ | |
137 | current->task_state_change = _THIS_IP_; \ | |
8eb23b9f PZ |
138 | } while (0) |
139 | ||
85019c16 | 140 | # define debug_special_state_change(state_value) \ |
b5bf9a90 | 141 | do { \ |
b5bf9a90 | 142 | WARN_ON_ONCE(!is_special_task_state(state_value)); \ |
b5bf9a90 | 143 | current->task_state_change = _THIS_IP_; \ |
b5bf9a90 | 144 | } while (0) |
85019c16 | 145 | |
5f220be2 TG |
146 | # define debug_rtlock_wait_set_state() \ |
147 | do { \ | |
148 | current->saved_state_change = current->task_state_change;\ | |
149 | current->task_state_change = _THIS_IP_; \ | |
150 | } while (0) | |
151 | ||
152 | # define debug_rtlock_wait_restore_state() \ | |
153 | do { \ | |
154 | current->task_state_change = current->saved_state_change;\ | |
155 | } while (0) | |
156 | ||
8eb23b9f | 157 | #else |
85019c16 TG |
158 | # define debug_normal_state_change(cond) do { } while (0) |
159 | # define debug_special_state_change(cond) do { } while (0) | |
5f220be2 TG |
160 | # define debug_rtlock_wait_set_state() do { } while (0) |
161 | # define debug_rtlock_wait_restore_state() do { } while (0) | |
85019c16 TG |
162 | #endif |
163 | ||
498d0c57 AM |
164 | /* |
165 | * set_current_state() includes a barrier so that the write of current->state | |
166 | * is correctly serialised wrt the caller's subsequent test of whether to | |
167 | * actually sleep: | |
168 | * | |
a2250238 | 169 | * for (;;) { |
498d0c57 | 170 | * set_current_state(TASK_UNINTERRUPTIBLE); |
58877d34 PZ |
171 | * if (CONDITION) |
172 | * break; | |
a2250238 PZ |
173 | * |
174 | * schedule(); | |
175 | * } | |
176 | * __set_current_state(TASK_RUNNING); | |
177 | * | |
178 | * If the caller does not need such serialisation (because, for instance, the | |
58877d34 | 179 | * CONDITION test and condition change and wakeup are under the same lock) then |
a2250238 PZ |
180 | * use __set_current_state(). |
181 | * | |
182 | * The above is typically ordered against the wakeup, which does: | |
183 | * | |
58877d34 | 184 | * CONDITION = 1; |
b5bf9a90 | 185 | * wake_up_state(p, TASK_UNINTERRUPTIBLE); |
a2250238 | 186 | * |
58877d34 PZ |
187 | * where wake_up_state()/try_to_wake_up() executes a full memory barrier before |
188 | * accessing p->state. | |
a2250238 PZ |
189 | * |
190 | * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is, | |
191 | * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a | |
192 | * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING). | |
498d0c57 | 193 | * |
b5bf9a90 | 194 | * However, with slightly different timing the wakeup TASK_RUNNING store can |
dfcb245e | 195 | * also collide with the TASK_UNINTERRUPTIBLE store. Losing that store is not |
b5bf9a90 PZ |
196 | * a problem either because that will result in one extra go around the loop |
197 | * and our @cond test will save the day. | |
498d0c57 | 198 | * |
a2250238 | 199 | * Also see the comments of try_to_wake_up(). |
498d0c57 | 200 | */ |
b5bf9a90 | 201 | #define __set_current_state(state_value) \ |
85019c16 TG |
202 | do { \ |
203 | debug_normal_state_change((state_value)); \ | |
204 | WRITE_ONCE(current->__state, (state_value)); \ | |
205 | } while (0) | |
b5bf9a90 PZ |
206 | |
207 | #define set_current_state(state_value) \ | |
85019c16 TG |
208 | do { \ |
209 | debug_normal_state_change((state_value)); \ | |
210 | smp_store_mb(current->__state, (state_value)); \ | |
211 | } while (0) | |
b5bf9a90 PZ |
212 | |
213 | /* | |
214 | * set_special_state() should be used for those states when the blocking task | |
215 | * can not use the regular condition based wait-loop. In that case we must | |
85019c16 TG |
216 | * serialize against wakeups such that any possible in-flight TASK_RUNNING |
217 | * stores will not collide with our state change. | |
b5bf9a90 PZ |
218 | */ |
219 | #define set_special_state(state_value) \ | |
220 | do { \ | |
221 | unsigned long flags; /* may shadow */ \ | |
85019c16 | 222 | \ |
b5bf9a90 | 223 | raw_spin_lock_irqsave(¤t->pi_lock, flags); \ |
85019c16 | 224 | debug_special_state_change((state_value)); \ |
2f064a59 | 225 | WRITE_ONCE(current->__state, (state_value)); \ |
b5bf9a90 PZ |
226 | raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \ |
227 | } while (0) | |
228 | ||
5f220be2 TG |
229 | /* |
230 | * PREEMPT_RT specific variants for "sleeping" spin/rwlocks | |
231 | * | |
232 | * RT's spin/rwlock substitutions are state preserving. The state of the | |
233 | * task when blocking on the lock is saved in task_struct::saved_state and | |
234 | * restored after the lock has been acquired. These operations are | |
235 | * serialized by task_struct::pi_lock against try_to_wake_up(). Any non RT | |
236 | * lock related wakeups while the task is blocked on the lock are | |
237 | * redirected to operate on task_struct::saved_state to ensure that these | |
238 | * are not dropped. On restore task_struct::saved_state is set to | |
239 | * TASK_RUNNING so any wakeup attempt redirected to saved_state will fail. | |
240 | * | |
241 | * The lock operation looks like this: | |
242 | * | |
243 | * current_save_and_set_rtlock_wait_state(); | |
244 | * for (;;) { | |
245 | * if (try_lock()) | |
246 | * break; | |
247 | * raw_spin_unlock_irq(&lock->wait_lock); | |
248 | * schedule_rtlock(); | |
249 | * raw_spin_lock_irq(&lock->wait_lock); | |
250 | * set_current_state(TASK_RTLOCK_WAIT); | |
251 | * } | |
252 | * current_restore_rtlock_saved_state(); | |
253 | */ | |
254 | #define current_save_and_set_rtlock_wait_state() \ | |
255 | do { \ | |
256 | lockdep_assert_irqs_disabled(); \ | |
257 | raw_spin_lock(¤t->pi_lock); \ | |
258 | current->saved_state = current->__state; \ | |
259 | debug_rtlock_wait_set_state(); \ | |
260 | WRITE_ONCE(current->__state, TASK_RTLOCK_WAIT); \ | |
261 | raw_spin_unlock(¤t->pi_lock); \ | |
262 | } while (0); | |
263 | ||
264 | #define current_restore_rtlock_saved_state() \ | |
265 | do { \ | |
266 | lockdep_assert_irqs_disabled(); \ | |
267 | raw_spin_lock(¤t->pi_lock); \ | |
268 | debug_rtlock_wait_restore_state(); \ | |
269 | WRITE_ONCE(current->__state, current->saved_state); \ | |
270 | current->saved_state = TASK_RUNNING; \ | |
271 | raw_spin_unlock(¤t->pi_lock); \ | |
272 | } while (0); | |
8eb23b9f | 273 | |
2f064a59 | 274 | #define get_current_state() READ_ONCE(current->__state) |
d6c23bb3 | 275 | |
3087c61e YS |
276 | /* |
277 | * Define the task command name length as enum, then it can be visible to | |
278 | * BPF programs. | |
279 | */ | |
280 | enum { | |
281 | TASK_COMM_LEN = 16, | |
282 | }; | |
1da177e4 | 283 | |
1da177e4 LT |
284 | extern void scheduler_tick(void); |
285 | ||
5eca1c10 IM |
286 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
287 | ||
288 | extern long schedule_timeout(long timeout); | |
289 | extern long schedule_timeout_interruptible(long timeout); | |
290 | extern long schedule_timeout_killable(long timeout); | |
291 | extern long schedule_timeout_uninterruptible(long timeout); | |
292 | extern long schedule_timeout_idle(long timeout); | |
1da177e4 | 293 | asmlinkage void schedule(void); |
c5491ea7 | 294 | extern void schedule_preempt_disabled(void); |
19c95f26 | 295 | asmlinkage void preempt_schedule_irq(void); |
6991436c TG |
296 | #ifdef CONFIG_PREEMPT_RT |
297 | extern void schedule_rtlock(void); | |
298 | #endif | |
1da177e4 | 299 | |
10ab5643 TH |
300 | extern int __must_check io_schedule_prepare(void); |
301 | extern void io_schedule_finish(int token); | |
9cff8ade | 302 | extern long io_schedule_timeout(long timeout); |
10ab5643 | 303 | extern void io_schedule(void); |
9cff8ade | 304 | |
d37f761d | 305 | /** |
0ba42a59 | 306 | * struct prev_cputime - snapshot of system and user cputime |
d37f761d FW |
307 | * @utime: time spent in user mode |
308 | * @stime: time spent in system mode | |
9d7fb042 | 309 | * @lock: protects the above two fields |
d37f761d | 310 | * |
9d7fb042 PZ |
311 | * Stores previous user/system time values such that we can guarantee |
312 | * monotonicity. | |
d37f761d | 313 | */ |
9d7fb042 PZ |
314 | struct prev_cputime { |
315 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
5eca1c10 IM |
316 | u64 utime; |
317 | u64 stime; | |
318 | raw_spinlock_t lock; | |
9d7fb042 | 319 | #endif |
d37f761d FW |
320 | }; |
321 | ||
bac5b6b6 FW |
322 | enum vtime_state { |
323 | /* Task is sleeping or running in a CPU with VTIME inactive: */ | |
324 | VTIME_INACTIVE = 0, | |
14faf6fc FW |
325 | /* Task is idle */ |
326 | VTIME_IDLE, | |
bac5b6b6 FW |
327 | /* Task runs in kernelspace in a CPU with VTIME active: */ |
328 | VTIME_SYS, | |
14faf6fc FW |
329 | /* Task runs in userspace in a CPU with VTIME active: */ |
330 | VTIME_USER, | |
e6d5bf3e FW |
331 | /* Task runs as guests in a CPU with VTIME active: */ |
332 | VTIME_GUEST, | |
bac5b6b6 FW |
333 | }; |
334 | ||
335 | struct vtime { | |
336 | seqcount_t seqcount; | |
337 | unsigned long long starttime; | |
338 | enum vtime_state state; | |
802f4a82 | 339 | unsigned int cpu; |
2a42eb95 WL |
340 | u64 utime; |
341 | u64 stime; | |
342 | u64 gtime; | |
bac5b6b6 FW |
343 | }; |
344 | ||
69842cba PB |
345 | /* |
346 | * Utilization clamp constraints. | |
347 | * @UCLAMP_MIN: Minimum utilization | |
348 | * @UCLAMP_MAX: Maximum utilization | |
349 | * @UCLAMP_CNT: Utilization clamp constraints count | |
350 | */ | |
351 | enum uclamp_id { | |
352 | UCLAMP_MIN = 0, | |
353 | UCLAMP_MAX, | |
354 | UCLAMP_CNT | |
355 | }; | |
356 | ||
f9a25f77 MP |
357 | #ifdef CONFIG_SMP |
358 | extern struct root_domain def_root_domain; | |
359 | extern struct mutex sched_domains_mutex; | |
360 | #endif | |
361 | ||
1da177e4 | 362 | struct sched_info { |
7f5f8e8d | 363 | #ifdef CONFIG_SCHED_INFO |
5eca1c10 IM |
364 | /* Cumulative counters: */ |
365 | ||
366 | /* # of times we have run on this CPU: */ | |
367 | unsigned long pcount; | |
368 | ||
369 | /* Time spent waiting on a runqueue: */ | |
370 | unsigned long long run_delay; | |
371 | ||
372 | /* Timestamps: */ | |
373 | ||
374 | /* When did we last run on a CPU? */ | |
375 | unsigned long long last_arrival; | |
376 | ||
377 | /* When were we last queued to run? */ | |
378 | unsigned long long last_queued; | |
1da177e4 | 379 | |
f6db8347 | 380 | #endif /* CONFIG_SCHED_INFO */ |
7f5f8e8d | 381 | }; |
1da177e4 | 382 | |
6ecdd749 YD |
383 | /* |
384 | * Integer metrics need fixed point arithmetic, e.g., sched/fair | |
385 | * has a few: load, load_avg, util_avg, freq, and capacity. | |
386 | * | |
387 | * We define a basic fixed point arithmetic range, and then formalize | |
388 | * all these metrics based on that basic range. | |
389 | */ | |
5eca1c10 IM |
390 | # define SCHED_FIXEDPOINT_SHIFT 10 |
391 | # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT) | |
6ecdd749 | 392 | |
69842cba PB |
393 | /* Increase resolution of cpu_capacity calculations */ |
394 | # define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT | |
395 | # define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT) | |
396 | ||
20b8a59f | 397 | struct load_weight { |
5eca1c10 IM |
398 | unsigned long weight; |
399 | u32 inv_weight; | |
20b8a59f IM |
400 | }; |
401 | ||
7f65ea42 PB |
402 | /** |
403 | * struct util_est - Estimation utilization of FAIR tasks | |
404 | * @enqueued: instantaneous estimated utilization of a task/cpu | |
405 | * @ewma: the Exponential Weighted Moving Average (EWMA) | |
406 | * utilization of a task | |
407 | * | |
408 | * Support data structure to track an Exponential Weighted Moving Average | |
409 | * (EWMA) of a FAIR task's utilization. New samples are added to the moving | |
410 | * average each time a task completes an activation. Sample's weight is chosen | |
411 | * so that the EWMA will be relatively insensitive to transient changes to the | |
412 | * task's workload. | |
413 | * | |
414 | * The enqueued attribute has a slightly different meaning for tasks and cpus: | |
415 | * - task: the task's util_avg at last task dequeue time | |
416 | * - cfs_rq: the sum of util_est.enqueued for each RUNNABLE task on that CPU | |
417 | * Thus, the util_est.enqueued of a task represents the contribution on the | |
418 | * estimated utilization of the CPU where that task is currently enqueued. | |
419 | * | |
420 | * Only for tasks we track a moving average of the past instantaneous | |
421 | * estimated utilization. This allows to absorb sporadic drops in utilization | |
422 | * of an otherwise almost periodic task. | |
68d7a190 DE |
423 | * |
424 | * The UTIL_AVG_UNCHANGED flag is used to synchronize util_est with util_avg | |
425 | * updates. When a task is dequeued, its util_est should not be updated if its | |
426 | * util_avg has not been updated in the meantime. | |
427 | * This information is mapped into the MSB bit of util_est.enqueued at dequeue | |
428 | * time. Since max value of util_est.enqueued for a task is 1024 (PELT util_avg | |
429 | * for a task) it is safe to use MSB. | |
7f65ea42 PB |
430 | */ |
431 | struct util_est { | |
432 | unsigned int enqueued; | |
433 | unsigned int ewma; | |
434 | #define UTIL_EST_WEIGHT_SHIFT 2 | |
68d7a190 | 435 | #define UTIL_AVG_UNCHANGED 0x80000000 |
317d359d | 436 | } __attribute__((__aligned__(sizeof(u64)))); |
7f65ea42 | 437 | |
9d89c257 | 438 | /* |
9f683953 | 439 | * The load/runnable/util_avg accumulates an infinite geometric series |
0dacee1b | 440 | * (see __update_load_avg_cfs_rq() in kernel/sched/pelt.c). |
7b595334 YD |
441 | * |
442 | * [load_avg definition] | |
443 | * | |
444 | * load_avg = runnable% * scale_load_down(load) | |
445 | * | |
9f683953 VG |
446 | * [runnable_avg definition] |
447 | * | |
448 | * runnable_avg = runnable% * SCHED_CAPACITY_SCALE | |
7b595334 | 449 | * |
7b595334 YD |
450 | * [util_avg definition] |
451 | * | |
452 | * util_avg = running% * SCHED_CAPACITY_SCALE | |
453 | * | |
9f683953 VG |
454 | * where runnable% is the time ratio that a sched_entity is runnable and |
455 | * running% the time ratio that a sched_entity is running. | |
456 | * | |
457 | * For cfs_rq, they are the aggregated values of all runnable and blocked | |
458 | * sched_entities. | |
7b595334 | 459 | * |
c1b7b8d4 | 460 | * The load/runnable/util_avg doesn't directly factor frequency scaling and CPU |
9f683953 VG |
461 | * capacity scaling. The scaling is done through the rq_clock_pelt that is used |
462 | * for computing those signals (see update_rq_clock_pelt()) | |
7b595334 | 463 | * |
23127296 VG |
464 | * N.B., the above ratios (runnable% and running%) themselves are in the |
465 | * range of [0, 1]. To do fixed point arithmetics, we therefore scale them | |
466 | * to as large a range as necessary. This is for example reflected by | |
467 | * util_avg's SCHED_CAPACITY_SCALE. | |
7b595334 YD |
468 | * |
469 | * [Overflow issue] | |
470 | * | |
471 | * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities | |
472 | * with the highest load (=88761), always runnable on a single cfs_rq, | |
473 | * and should not overflow as the number already hits PID_MAX_LIMIT. | |
474 | * | |
475 | * For all other cases (including 32-bit kernels), struct load_weight's | |
476 | * weight will overflow first before we do, because: | |
477 | * | |
478 | * Max(load_avg) <= Max(load.weight) | |
479 | * | |
480 | * Then it is the load_weight's responsibility to consider overflow | |
481 | * issues. | |
9d89c257 | 482 | */ |
9d85f21c | 483 | struct sched_avg { |
5eca1c10 IM |
484 | u64 last_update_time; |
485 | u64 load_sum; | |
9f683953 | 486 | u64 runnable_sum; |
5eca1c10 IM |
487 | u32 util_sum; |
488 | u32 period_contrib; | |
489 | unsigned long load_avg; | |
9f683953 | 490 | unsigned long runnable_avg; |
5eca1c10 | 491 | unsigned long util_avg; |
7f65ea42 | 492 | struct util_est util_est; |
317d359d | 493 | } ____cacheline_aligned; |
9d85f21c | 494 | |
41acab88 | 495 | struct sched_statistics { |
7f5f8e8d | 496 | #ifdef CONFIG_SCHEDSTATS |
5eca1c10 IM |
497 | u64 wait_start; |
498 | u64 wait_max; | |
499 | u64 wait_count; | |
500 | u64 wait_sum; | |
501 | u64 iowait_count; | |
502 | u64 iowait_sum; | |
503 | ||
504 | u64 sleep_start; | |
505 | u64 sleep_max; | |
506 | s64 sum_sleep_runtime; | |
507 | ||
508 | u64 block_start; | |
509 | u64 block_max; | |
847fc0cd YS |
510 | s64 sum_block_runtime; |
511 | ||
5eca1c10 IM |
512 | u64 exec_max; |
513 | u64 slice_max; | |
514 | ||
515 | u64 nr_migrations_cold; | |
516 | u64 nr_failed_migrations_affine; | |
517 | u64 nr_failed_migrations_running; | |
518 | u64 nr_failed_migrations_hot; | |
519 | u64 nr_forced_migrations; | |
520 | ||
521 | u64 nr_wakeups; | |
522 | u64 nr_wakeups_sync; | |
523 | u64 nr_wakeups_migrate; | |
524 | u64 nr_wakeups_local; | |
525 | u64 nr_wakeups_remote; | |
526 | u64 nr_wakeups_affine; | |
527 | u64 nr_wakeups_affine_attempts; | |
528 | u64 nr_wakeups_passive; | |
529 | u64 nr_wakeups_idle; | |
4feee7d1 JD |
530 | |
531 | #ifdef CONFIG_SCHED_CORE | |
532 | u64 core_forceidle_sum; | |
41acab88 | 533 | #endif |
4feee7d1 | 534 | #endif /* CONFIG_SCHEDSTATS */ |
ceeadb83 | 535 | } ____cacheline_aligned; |
41acab88 LDM |
536 | |
537 | struct sched_entity { | |
5eca1c10 IM |
538 | /* For load-balancing: */ |
539 | struct load_weight load; | |
540 | struct rb_node run_node; | |
541 | struct list_head group_node; | |
542 | unsigned int on_rq; | |
41acab88 | 543 | |
5eca1c10 IM |
544 | u64 exec_start; |
545 | u64 sum_exec_runtime; | |
546 | u64 vruntime; | |
547 | u64 prev_sum_exec_runtime; | |
41acab88 | 548 | |
5eca1c10 | 549 | u64 nr_migrations; |
41acab88 | 550 | |
20b8a59f | 551 | #ifdef CONFIG_FAIR_GROUP_SCHED |
5eca1c10 IM |
552 | int depth; |
553 | struct sched_entity *parent; | |
20b8a59f | 554 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 555 | struct cfs_rq *cfs_rq; |
20b8a59f | 556 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 557 | struct cfs_rq *my_q; |
9f683953 VG |
558 | /* cached value of my_q->h_nr_running */ |
559 | unsigned long runnable_weight; | |
20b8a59f | 560 | #endif |
8bd75c77 | 561 | |
141965c7 | 562 | #ifdef CONFIG_SMP |
5a107804 JO |
563 | /* |
564 | * Per entity load average tracking. | |
565 | * | |
566 | * Put into separate cache line so it does not | |
567 | * collide with read-mostly values above. | |
568 | */ | |
317d359d | 569 | struct sched_avg avg; |
9d85f21c | 570 | #endif |
20b8a59f | 571 | }; |
70b97a7f | 572 | |
fa717060 | 573 | struct sched_rt_entity { |
5eca1c10 IM |
574 | struct list_head run_list; |
575 | unsigned long timeout; | |
576 | unsigned long watchdog_stamp; | |
577 | unsigned int time_slice; | |
578 | unsigned short on_rq; | |
579 | unsigned short on_list; | |
580 | ||
581 | struct sched_rt_entity *back; | |
052f1dc7 | 582 | #ifdef CONFIG_RT_GROUP_SCHED |
5eca1c10 | 583 | struct sched_rt_entity *parent; |
6f505b16 | 584 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 585 | struct rt_rq *rt_rq; |
6f505b16 | 586 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 587 | struct rt_rq *my_q; |
6f505b16 | 588 | #endif |
3859a271 | 589 | } __randomize_layout; |
fa717060 | 590 | |
aab03e05 | 591 | struct sched_dl_entity { |
5eca1c10 | 592 | struct rb_node rb_node; |
aab03e05 DF |
593 | |
594 | /* | |
595 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 596 | * during sched_setattr(), they will remain the same until |
597 | * the next sched_setattr(). | |
aab03e05 | 598 | */ |
5eca1c10 IM |
599 | u64 dl_runtime; /* Maximum runtime for each instance */ |
600 | u64 dl_deadline; /* Relative deadline of each instance */ | |
601 | u64 dl_period; /* Separation of two instances (period) */ | |
54d6d303 | 602 | u64 dl_bw; /* dl_runtime / dl_period */ |
3effcb42 | 603 | u64 dl_density; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
604 | |
605 | /* | |
606 | * Actual scheduling parameters. Initialized with the values above, | |
dfcb245e | 607 | * they are continuously updated during task execution. Note that |
aab03e05 DF |
608 | * the remaining runtime could be < 0 in case we are in overrun. |
609 | */ | |
5eca1c10 IM |
610 | s64 runtime; /* Remaining runtime for this instance */ |
611 | u64 deadline; /* Absolute deadline for this instance */ | |
612 | unsigned int flags; /* Specifying the scheduler behaviour */ | |
aab03e05 DF |
613 | |
614 | /* | |
615 | * Some bool flags: | |
616 | * | |
617 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
618 | * task has to wait for a replenishment to be performed at the | |
619 | * next firing of dl_timer. | |
620 | * | |
5eca1c10 | 621 | * @dl_yielded tells if task gave up the CPU before consuming |
5bfd126e | 622 | * all its available runtime during the last job. |
209a0cbd LA |
623 | * |
624 | * @dl_non_contending tells if the task is inactive while still | |
625 | * contributing to the active utilization. In other words, it | |
626 | * indicates if the inactive timer has been armed and its handler | |
627 | * has not been executed yet. This flag is useful to avoid race | |
628 | * conditions between the inactive timer handler and the wakeup | |
629 | * code. | |
34be3930 JL |
630 | * |
631 | * @dl_overrun tells if the task asked to be informed about runtime | |
632 | * overruns. | |
aab03e05 | 633 | */ |
aa5222e9 | 634 | unsigned int dl_throttled : 1; |
aa5222e9 DC |
635 | unsigned int dl_yielded : 1; |
636 | unsigned int dl_non_contending : 1; | |
34be3930 | 637 | unsigned int dl_overrun : 1; |
aab03e05 DF |
638 | |
639 | /* | |
640 | * Bandwidth enforcement timer. Each -deadline task has its | |
641 | * own bandwidth to be enforced, thus we need one timer per task. | |
642 | */ | |
5eca1c10 | 643 | struct hrtimer dl_timer; |
209a0cbd LA |
644 | |
645 | /* | |
646 | * Inactive timer, responsible for decreasing the active utilization | |
647 | * at the "0-lag time". When a -deadline task blocks, it contributes | |
648 | * to GRUB's active utilization until the "0-lag time", hence a | |
649 | * timer is needed to decrease the active utilization at the correct | |
650 | * time. | |
651 | */ | |
652 | struct hrtimer inactive_timer; | |
2279f540 JL |
653 | |
654 | #ifdef CONFIG_RT_MUTEXES | |
655 | /* | |
656 | * Priority Inheritance. When a DEADLINE scheduling entity is boosted | |
657 | * pi_se points to the donor, otherwise points to the dl_se it belongs | |
658 | * to (the original one/itself). | |
659 | */ | |
660 | struct sched_dl_entity *pi_se; | |
661 | #endif | |
aab03e05 | 662 | }; |
8bd75c77 | 663 | |
69842cba PB |
664 | #ifdef CONFIG_UCLAMP_TASK |
665 | /* Number of utilization clamp buckets (shorter alias) */ | |
666 | #define UCLAMP_BUCKETS CONFIG_UCLAMP_BUCKETS_COUNT | |
667 | ||
668 | /* | |
669 | * Utilization clamp for a scheduling entity | |
670 | * @value: clamp value "assigned" to a se | |
671 | * @bucket_id: bucket index corresponding to the "assigned" value | |
e8f14172 | 672 | * @active: the se is currently refcounted in a rq's bucket |
a509a7cd | 673 | * @user_defined: the requested clamp value comes from user-space |
69842cba PB |
674 | * |
675 | * The bucket_id is the index of the clamp bucket matching the clamp value | |
676 | * which is pre-computed and stored to avoid expensive integer divisions from | |
677 | * the fast path. | |
e8f14172 PB |
678 | * |
679 | * The active bit is set whenever a task has got an "effective" value assigned, | |
680 | * which can be different from the clamp value "requested" from user-space. | |
681 | * This allows to know a task is refcounted in the rq's bucket corresponding | |
682 | * to the "effective" bucket_id. | |
a509a7cd PB |
683 | * |
684 | * The user_defined bit is set whenever a task has got a task-specific clamp | |
685 | * value requested from userspace, i.e. the system defaults apply to this task | |
686 | * just as a restriction. This allows to relax default clamps when a less | |
687 | * restrictive task-specific value has been requested, thus allowing to | |
688 | * implement a "nice" semantic. For example, a task running with a 20% | |
689 | * default boost can still drop its own boosting to 0%. | |
69842cba PB |
690 | */ |
691 | struct uclamp_se { | |
692 | unsigned int value : bits_per(SCHED_CAPACITY_SCALE); | |
693 | unsigned int bucket_id : bits_per(UCLAMP_BUCKETS); | |
e8f14172 | 694 | unsigned int active : 1; |
a509a7cd | 695 | unsigned int user_defined : 1; |
69842cba PB |
696 | }; |
697 | #endif /* CONFIG_UCLAMP_TASK */ | |
698 | ||
1d082fd0 PM |
699 | union rcu_special { |
700 | struct { | |
5eca1c10 IM |
701 | u8 blocked; |
702 | u8 need_qs; | |
05f41571 | 703 | u8 exp_hint; /* Hint for performance. */ |
276c4104 | 704 | u8 need_mb; /* Readers need smp_mb(). */ |
8203d6d0 | 705 | } b; /* Bits. */ |
05f41571 | 706 | u32 s; /* Set of bits. */ |
1d082fd0 | 707 | }; |
86848966 | 708 | |
8dc85d54 PZ |
709 | enum perf_event_task_context { |
710 | perf_invalid_context = -1, | |
711 | perf_hw_context = 0, | |
89a1e187 | 712 | perf_sw_context, |
8dc85d54 PZ |
713 | perf_nr_task_contexts, |
714 | }; | |
715 | ||
eb61baf6 IM |
716 | struct wake_q_node { |
717 | struct wake_q_node *next; | |
718 | }; | |
719 | ||
5fbda3ec TG |
720 | struct kmap_ctrl { |
721 | #ifdef CONFIG_KMAP_LOCAL | |
722 | int idx; | |
723 | pte_t pteval[KM_MAX_IDX]; | |
724 | #endif | |
725 | }; | |
726 | ||
1da177e4 | 727 | struct task_struct { |
c65eacbe AL |
728 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
729 | /* | |
730 | * For reasons of header soup (see current_thread_info()), this | |
731 | * must be the first element of task_struct. | |
732 | */ | |
5eca1c10 | 733 | struct thread_info thread_info; |
c65eacbe | 734 | #endif |
2f064a59 | 735 | unsigned int __state; |
29e48ce8 | 736 | |
5f220be2 TG |
737 | #ifdef CONFIG_PREEMPT_RT |
738 | /* saved state for "spinlock sleepers" */ | |
739 | unsigned int saved_state; | |
740 | #endif | |
741 | ||
29e48ce8 KC |
742 | /* |
743 | * This begins the randomizable portion of task_struct. Only | |
744 | * scheduling-critical items should be added above here. | |
745 | */ | |
746 | randomized_struct_fields_start | |
747 | ||
5eca1c10 | 748 | void *stack; |
ec1d2819 | 749 | refcount_t usage; |
5eca1c10 IM |
750 | /* Per task flags (PF_*), defined further below: */ |
751 | unsigned int flags; | |
752 | unsigned int ptrace; | |
1da177e4 | 753 | |
2dd73a4f | 754 | #ifdef CONFIG_SMP |
5eca1c10 | 755 | int on_cpu; |
8c4890d1 | 756 | struct __call_single_node wake_entry; |
5eca1c10 IM |
757 | unsigned int wakee_flips; |
758 | unsigned long wakee_flip_decay_ts; | |
759 | struct task_struct *last_wakee; | |
ac66f547 | 760 | |
32e839dd MG |
761 | /* |
762 | * recent_used_cpu is initially set as the last CPU used by a task | |
763 | * that wakes affine another task. Waker/wakee relationships can | |
764 | * push tasks around a CPU where each wakeup moves to the next one. | |
765 | * Tracking a recently used CPU allows a quick search for a recently | |
766 | * used CPU that may be idle. | |
767 | */ | |
768 | int recent_used_cpu; | |
5eca1c10 | 769 | int wake_cpu; |
2dd73a4f | 770 | #endif |
5eca1c10 IM |
771 | int on_rq; |
772 | ||
773 | int prio; | |
774 | int static_prio; | |
775 | int normal_prio; | |
776 | unsigned int rt_priority; | |
50e645a8 | 777 | |
5eca1c10 IM |
778 | struct sched_entity se; |
779 | struct sched_rt_entity rt; | |
8a311c74 | 780 | struct sched_dl_entity dl; |
804bccba | 781 | const struct sched_class *sched_class; |
8a311c74 PZ |
782 | |
783 | #ifdef CONFIG_SCHED_CORE | |
784 | struct rb_node core_node; | |
785 | unsigned long core_cookie; | |
d2dfa17b | 786 | unsigned int core_occupation; |
8a311c74 PZ |
787 | #endif |
788 | ||
8323f26c | 789 | #ifdef CONFIG_CGROUP_SCHED |
5eca1c10 | 790 | struct task_group *sched_task_group; |
8323f26c | 791 | #endif |
1da177e4 | 792 | |
69842cba | 793 | #ifdef CONFIG_UCLAMP_TASK |
13685c4a QY |
794 | /* |
795 | * Clamp values requested for a scheduling entity. | |
796 | * Must be updated with task_rq_lock() held. | |
797 | */ | |
e8f14172 | 798 | struct uclamp_se uclamp_req[UCLAMP_CNT]; |
13685c4a QY |
799 | /* |
800 | * Effective clamp values used for a scheduling entity. | |
801 | * Must be updated with task_rq_lock() held. | |
802 | */ | |
69842cba PB |
803 | struct uclamp_se uclamp[UCLAMP_CNT]; |
804 | #endif | |
805 | ||
ceeadb83 YS |
806 | struct sched_statistics stats; |
807 | ||
e107be36 | 808 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
5eca1c10 IM |
809 | /* List of struct preempt_notifier: */ |
810 | struct hlist_head preempt_notifiers; | |
e107be36 AK |
811 | #endif |
812 | ||
6c5c9341 | 813 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
5eca1c10 | 814 | unsigned int btrace_seq; |
6c5c9341 | 815 | #endif |
1da177e4 | 816 | |
5eca1c10 IM |
817 | unsigned int policy; |
818 | int nr_cpus_allowed; | |
3bd37062 | 819 | const cpumask_t *cpus_ptr; |
b90ca8ba | 820 | cpumask_t *user_cpus_ptr; |
3bd37062 | 821 | cpumask_t cpus_mask; |
6d337eab | 822 | void *migration_pending; |
74d862b6 | 823 | #ifdef CONFIG_SMP |
a7c81556 | 824 | unsigned short migration_disabled; |
af449901 | 825 | #endif |
a7c81556 | 826 | unsigned short migration_flags; |
1da177e4 | 827 | |
a57eb940 | 828 | #ifdef CONFIG_PREEMPT_RCU |
5eca1c10 IM |
829 | int rcu_read_lock_nesting; |
830 | union rcu_special rcu_read_unlock_special; | |
831 | struct list_head rcu_node_entry; | |
832 | struct rcu_node *rcu_blocked_node; | |
28f6569a | 833 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
5eca1c10 | 834 | |
8315f422 | 835 | #ifdef CONFIG_TASKS_RCU |
5eca1c10 | 836 | unsigned long rcu_tasks_nvcsw; |
ccdd29ff PM |
837 | u8 rcu_tasks_holdout; |
838 | u8 rcu_tasks_idx; | |
5eca1c10 | 839 | int rcu_tasks_idle_cpu; |
ccdd29ff | 840 | struct list_head rcu_tasks_holdout_list; |
8315f422 | 841 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
e260be67 | 842 | |
d5f177d3 PM |
843 | #ifdef CONFIG_TASKS_TRACE_RCU |
844 | int trc_reader_nesting; | |
845 | int trc_ipi_to_cpu; | |
276c4104 | 846 | union rcu_special trc_reader_special; |
d5f177d3 | 847 | struct list_head trc_holdout_list; |
434c9eef PM |
848 | struct list_head trc_blkd_node; |
849 | int trc_blkd_cpu; | |
d5f177d3 PM |
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() */ | |
9f0deaa1 | 939 | unsigned in_eventfd:1; |
b542e383 | 940 | #endif |
a3d29e82 PZ |
941 | #ifdef CONFIG_IOMMU_SVA |
942 | unsigned pasid_activated:1; | |
943 | #endif | |
b041b525 TL |
944 | #ifdef CONFIG_CPU_SUP_INTEL |
945 | unsigned reported_split_lock:1; | |
946 | #endif | |
6f185c29 | 947 | |
5eca1c10 | 948 | unsigned long atomic_flags; /* Flags requiring atomic access. */ |
1d4457f9 | 949 | |
5eca1c10 | 950 | struct restart_block restart_block; |
f56141e3 | 951 | |
5eca1c10 IM |
952 | pid_t pid; |
953 | pid_t tgid; | |
0a425405 | 954 | |
050e9baa | 955 | #ifdef CONFIG_STACKPROTECTOR |
5eca1c10 IM |
956 | /* Canary value for the -fstack-protector GCC feature: */ |
957 | unsigned long stack_canary; | |
1314562a | 958 | #endif |
4d1d61a6 | 959 | /* |
5eca1c10 | 960 | * Pointers to the (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 961 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 962 | * p->real_parent->pid) |
1da177e4 | 963 | */ |
5eca1c10 IM |
964 | |
965 | /* Real parent process: */ | |
966 | struct task_struct __rcu *real_parent; | |
967 | ||
968 | /* Recipient of SIGCHLD, wait4() reports: */ | |
969 | struct task_struct __rcu *parent; | |
970 | ||
1da177e4 | 971 | /* |
5eca1c10 | 972 | * Children/sibling form the list of natural children: |
1da177e4 | 973 | */ |
5eca1c10 IM |
974 | struct list_head children; |
975 | struct list_head sibling; | |
976 | struct task_struct *group_leader; | |
1da177e4 | 977 | |
f470021a | 978 | /* |
5eca1c10 IM |
979 | * 'ptraced' is the list of tasks this task is using ptrace() on. |
980 | * | |
f470021a | 981 | * This includes both natural children and PTRACE_ATTACH targets. |
5eca1c10 | 982 | * 'ptrace_entry' is this task's link on the p->parent->ptraced list. |
f470021a | 983 | */ |
5eca1c10 IM |
984 | struct list_head ptraced; |
985 | struct list_head ptrace_entry; | |
f470021a | 986 | |
1da177e4 | 987 | /* PID/PID hash table linkage. */ |
2c470475 EB |
988 | struct pid *thread_pid; |
989 | struct hlist_node pid_links[PIDTYPE_MAX]; | |
5eca1c10 IM |
990 | struct list_head thread_group; |
991 | struct list_head thread_node; | |
992 | ||
993 | struct completion *vfork_done; | |
1da177e4 | 994 | |
5eca1c10 IM |
995 | /* CLONE_CHILD_SETTID: */ |
996 | int __user *set_child_tid; | |
1da177e4 | 997 | |
5eca1c10 IM |
998 | /* CLONE_CHILD_CLEARTID: */ |
999 | int __user *clear_child_tid; | |
1000 | ||
e32cf5df EB |
1001 | /* PF_KTHREAD | PF_IO_WORKER */ |
1002 | void *worker_private; | |
3bfe6106 | 1003 | |
5eca1c10 IM |
1004 | u64 utime; |
1005 | u64 stime; | |
40565b5a | 1006 | #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME |
5eca1c10 IM |
1007 | u64 utimescaled; |
1008 | u64 stimescaled; | |
40565b5a | 1009 | #endif |
5eca1c10 IM |
1010 | u64 gtime; |
1011 | struct prev_cputime prev_cputime; | |
6a61671b | 1012 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
bac5b6b6 | 1013 | struct vtime vtime; |
d99ca3b9 | 1014 | #endif |
d027d45d FW |
1015 | |
1016 | #ifdef CONFIG_NO_HZ_FULL | |
5eca1c10 | 1017 | atomic_t tick_dep_mask; |
d027d45d | 1018 | #endif |
5eca1c10 IM |
1019 | /* Context switch counts: */ |
1020 | unsigned long nvcsw; | |
1021 | unsigned long nivcsw; | |
1022 | ||
1023 | /* Monotonic time in nsecs: */ | |
1024 | u64 start_time; | |
1025 | ||
1026 | /* Boot based time in nsecs: */ | |
cf25e24d | 1027 | u64 start_boottime; |
5eca1c10 IM |
1028 | |
1029 | /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */ | |
1030 | unsigned long min_flt; | |
1031 | unsigned long maj_flt; | |
1da177e4 | 1032 | |
2b69942f TG |
1033 | /* Empty if CONFIG_POSIX_CPUTIMERS=n */ |
1034 | struct posix_cputimers posix_cputimers; | |
1da177e4 | 1035 | |
1fb497dd TG |
1036 | #ifdef CONFIG_POSIX_CPU_TIMERS_TASK_WORK |
1037 | struct posix_cputimers_work posix_cputimers_work; | |
1038 | #endif | |
1039 | ||
5eca1c10 IM |
1040 | /* Process credentials: */ |
1041 | ||
1042 | /* Tracer's credentials at attach: */ | |
1043 | const struct cred __rcu *ptracer_cred; | |
1044 | ||
1045 | /* Objective and real subjective task credentials (COW): */ | |
1046 | const struct cred __rcu *real_cred; | |
1047 | ||
1048 | /* Effective (overridable) subjective task credentials (COW): */ | |
1049 | const struct cred __rcu *cred; | |
1050 | ||
7743c48e DH |
1051 | #ifdef CONFIG_KEYS |
1052 | /* Cached requested key. */ | |
1053 | struct key *cached_requested_key; | |
1054 | #endif | |
1055 | ||
5eca1c10 IM |
1056 | /* |
1057 | * executable name, excluding path. | |
1058 | * | |
1059 | * - normally initialized setup_new_exec() | |
1060 | * - access it with [gs]et_task_comm() | |
1061 | * - lock it with task_lock() | |
1062 | */ | |
1063 | char comm[TASK_COMM_LEN]; | |
1064 | ||
1065 | struct nameidata *nameidata; | |
1066 | ||
3d5b6fcc | 1067 | #ifdef CONFIG_SYSVIPC |
5eca1c10 IM |
1068 | struct sysv_sem sysvsem; |
1069 | struct sysv_shm sysvshm; | |
3d5b6fcc | 1070 | #endif |
e162b39a | 1071 | #ifdef CONFIG_DETECT_HUNG_TASK |
5eca1c10 | 1072 | unsigned long last_switch_count; |
a2e51445 | 1073 | unsigned long last_switch_time; |
82a1fcb9 | 1074 | #endif |
5eca1c10 IM |
1075 | /* Filesystem information: */ |
1076 | struct fs_struct *fs; | |
1077 | ||
1078 | /* Open file information: */ | |
1079 | struct files_struct *files; | |
1080 | ||
0f212204 JA |
1081 | #ifdef CONFIG_IO_URING |
1082 | struct io_uring_task *io_uring; | |
1083 | #endif | |
1084 | ||
5eca1c10 IM |
1085 | /* Namespaces: */ |
1086 | struct nsproxy *nsproxy; | |
1087 | ||
1088 | /* Signal handlers: */ | |
1089 | struct signal_struct *signal; | |
913292c9 | 1090 | struct sighand_struct __rcu *sighand; |
5eca1c10 IM |
1091 | sigset_t blocked; |
1092 | sigset_t real_blocked; | |
1093 | /* Restored if set_restore_sigmask() was used: */ | |
1094 | sigset_t saved_sigmask; | |
1095 | struct sigpending pending; | |
1096 | unsigned long sas_ss_sp; | |
1097 | size_t sas_ss_size; | |
1098 | unsigned int sas_ss_flags; | |
1099 | ||
1100 | struct callback_head *task_works; | |
1101 | ||
4b7d248b | 1102 | #ifdef CONFIG_AUDIT |
bfef93a5 | 1103 | #ifdef CONFIG_AUDITSYSCALL |
5f3d544f RGB |
1104 | struct audit_context *audit_context; |
1105 | #endif | |
5eca1c10 IM |
1106 | kuid_t loginuid; |
1107 | unsigned int sessionid; | |
bfef93a5 | 1108 | #endif |
5eca1c10 | 1109 | struct seccomp seccomp; |
1446e1df | 1110 | struct syscall_user_dispatch syscall_dispatch; |
5eca1c10 IM |
1111 | |
1112 | /* Thread group tracking: */ | |
d1e7fd64 EB |
1113 | u64 parent_exec_id; |
1114 | u64 self_exec_id; | |
1da177e4 | 1115 | |
5eca1c10 IM |
1116 | /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */ |
1117 | spinlock_t alloc_lock; | |
1da177e4 | 1118 | |
b29739f9 | 1119 | /* Protection of the PI data structures: */ |
5eca1c10 | 1120 | raw_spinlock_t pi_lock; |
b29739f9 | 1121 | |
5eca1c10 | 1122 | struct wake_q_node wake_q; |
76751049 | 1123 | |
23f78d4a | 1124 | #ifdef CONFIG_RT_MUTEXES |
5eca1c10 | 1125 | /* PI waiters blocked on a rt_mutex held by this task: */ |
a23ba907 | 1126 | struct rb_root_cached pi_waiters; |
e96a7705 XP |
1127 | /* Updated under owner's pi_lock and rq lock */ |
1128 | struct task_struct *pi_top_task; | |
5eca1c10 IM |
1129 | /* Deadlock detection and priority inheritance handling: */ |
1130 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1131 | #endif |
1132 | ||
408894ee | 1133 | #ifdef CONFIG_DEBUG_MUTEXES |
5eca1c10 IM |
1134 | /* Mutex deadlock detection: */ |
1135 | struct mutex_waiter *blocked_on; | |
408894ee | 1136 | #endif |
5eca1c10 | 1137 | |
312364f3 SV |
1138 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
1139 | int non_block_count; | |
1140 | #endif | |
1141 | ||
de30a2b3 | 1142 | #ifdef CONFIG_TRACE_IRQFLAGS |
0584df9c | 1143 | struct irqtrace_events irqtrace; |
de8f5e4f | 1144 | unsigned int hardirq_threaded; |
c86e9b98 | 1145 | u64 hardirq_chain_key; |
5eca1c10 IM |
1146 | int softirqs_enabled; |
1147 | int softirq_context; | |
40db1739 | 1148 | int irq_config; |
de30a2b3 | 1149 | #endif |
728b478d TG |
1150 | #ifdef CONFIG_PREEMPT_RT |
1151 | int softirq_disable_cnt; | |
1152 | #endif | |
5eca1c10 | 1153 | |
fbb9ce95 | 1154 | #ifdef CONFIG_LOCKDEP |
5eca1c10 IM |
1155 | # define MAX_LOCK_DEPTH 48UL |
1156 | u64 curr_chain_key; | |
1157 | int lockdep_depth; | |
1158 | unsigned int lockdep_recursion; | |
1159 | struct held_lock held_locks[MAX_LOCK_DEPTH]; | |
fbb9ce95 | 1160 | #endif |
5eca1c10 | 1161 | |
5cf53f3c | 1162 | #if defined(CONFIG_UBSAN) && !defined(CONFIG_UBSAN_TRAP) |
5eca1c10 | 1163 | unsigned int in_ubsan; |
c6d30853 | 1164 | #endif |
408894ee | 1165 | |
5eca1c10 IM |
1166 | /* Journalling filesystem info: */ |
1167 | void *journal_info; | |
1da177e4 | 1168 | |
5eca1c10 IM |
1169 | /* Stacked block device info: */ |
1170 | struct bio_list *bio_list; | |
d89d8796 | 1171 | |
5eca1c10 IM |
1172 | /* Stack plugging: */ |
1173 | struct blk_plug *plug; | |
73c10101 | 1174 | |
5eca1c10 IM |
1175 | /* VM state: */ |
1176 | struct reclaim_state *reclaim_state; | |
1177 | ||
1178 | struct backing_dev_info *backing_dev_info; | |
1da177e4 | 1179 | |
5eca1c10 | 1180 | struct io_context *io_context; |
1da177e4 | 1181 | |
5e1f0f09 MG |
1182 | #ifdef CONFIG_COMPACTION |
1183 | struct capture_control *capture_control; | |
1184 | #endif | |
5eca1c10 IM |
1185 | /* Ptrace state: */ |
1186 | unsigned long ptrace_message; | |
ae7795bc | 1187 | kernel_siginfo_t *last_siginfo; |
1da177e4 | 1188 | |
5eca1c10 | 1189 | struct task_io_accounting ioac; |
eb414681 JW |
1190 | #ifdef CONFIG_PSI |
1191 | /* Pressure stall state */ | |
1192 | unsigned int psi_flags; | |
1193 | #endif | |
5eca1c10 IM |
1194 | #ifdef CONFIG_TASK_XACCT |
1195 | /* Accumulated RSS usage: */ | |
1196 | u64 acct_rss_mem1; | |
1197 | /* Accumulated virtual memory usage: */ | |
1198 | u64 acct_vm_mem1; | |
1199 | /* stime + utime since last update: */ | |
1200 | u64 acct_timexpd; | |
1da177e4 LT |
1201 | #endif |
1202 | #ifdef CONFIG_CPUSETS | |
5eca1c10 IM |
1203 | /* Protected by ->alloc_lock: */ |
1204 | nodemask_t mems_allowed; | |
3b03706f | 1205 | /* Sequence number to catch updates: */ |
b7505861 | 1206 | seqcount_spinlock_t mems_allowed_seq; |
5eca1c10 IM |
1207 | int cpuset_mem_spread_rotor; |
1208 | int cpuset_slab_spread_rotor; | |
1da177e4 | 1209 | #endif |
ddbcc7e8 | 1210 | #ifdef CONFIG_CGROUPS |
5eca1c10 IM |
1211 | /* Control Group info protected by css_set_lock: */ |
1212 | struct css_set __rcu *cgroups; | |
1213 | /* cg_list protected by css_set_lock and tsk->alloc_lock: */ | |
1214 | struct list_head cg_list; | |
ddbcc7e8 | 1215 | #endif |
e6d42931 | 1216 | #ifdef CONFIG_X86_CPU_RESCTRL |
0734ded1 | 1217 | u32 closid; |
d6aaba61 | 1218 | u32 rmid; |
e02737d5 | 1219 | #endif |
42b2dd0a | 1220 | #ifdef CONFIG_FUTEX |
5eca1c10 | 1221 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1222 | #ifdef CONFIG_COMPAT |
1223 | struct compat_robust_list_head __user *compat_robust_list; | |
1224 | #endif | |
5eca1c10 IM |
1225 | struct list_head pi_state_list; |
1226 | struct futex_pi_state *pi_state_cache; | |
3f186d97 | 1227 | struct mutex futex_exit_mutex; |
3d4775df | 1228 | unsigned int futex_state; |
c7aceaba | 1229 | #endif |
cdd6c482 | 1230 | #ifdef CONFIG_PERF_EVENTS |
5eca1c10 IM |
1231 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
1232 | struct mutex perf_event_mutex; | |
1233 | struct list_head perf_event_list; | |
a63eaf34 | 1234 | #endif |
8f47b187 | 1235 | #ifdef CONFIG_DEBUG_PREEMPT |
5eca1c10 | 1236 | unsigned long preempt_disable_ip; |
8f47b187 | 1237 | #endif |
c7aceaba | 1238 | #ifdef CONFIG_NUMA |
5eca1c10 IM |
1239 | /* Protected by alloc_lock: */ |
1240 | struct mempolicy *mempolicy; | |
45816682 | 1241 | short il_prev; |
5eca1c10 | 1242 | short pref_node_fork; |
42b2dd0a | 1243 | #endif |
cbee9f88 | 1244 | #ifdef CONFIG_NUMA_BALANCING |
5eca1c10 IM |
1245 | int numa_scan_seq; |
1246 | unsigned int numa_scan_period; | |
1247 | unsigned int numa_scan_period_max; | |
1248 | int numa_preferred_nid; | |
1249 | unsigned long numa_migrate_retry; | |
1250 | /* Migration stamp: */ | |
1251 | u64 node_stamp; | |
1252 | u64 last_task_numa_placement; | |
1253 | u64 last_sum_exec_runtime; | |
1254 | struct callback_head numa_work; | |
1255 | ||
cb361d8c JH |
1256 | /* |
1257 | * This pointer is only modified for current in syscall and | |
1258 | * pagefault context (and for tasks being destroyed), so it can be read | |
1259 | * from any of the following contexts: | |
1260 | * - RCU read-side critical section | |
1261 | * - current->numa_group from everywhere | |
1262 | * - task's runqueue locked, task not running | |
1263 | */ | |
1264 | struct numa_group __rcu *numa_group; | |
8c8a743c | 1265 | |
745d6147 | 1266 | /* |
44dba3d5 IM |
1267 | * numa_faults is an array split into four regions: |
1268 | * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer | |
1269 | * in this precise order. | |
1270 | * | |
1271 | * faults_memory: Exponential decaying average of faults on a per-node | |
1272 | * basis. Scheduling placement decisions are made based on these | |
1273 | * counts. The values remain static for the duration of a PTE scan. | |
1274 | * faults_cpu: Track the nodes the process was running on when a NUMA | |
1275 | * hinting fault was incurred. | |
1276 | * faults_memory_buffer and faults_cpu_buffer: Record faults per node | |
1277 | * during the current scan window. When the scan completes, the counts | |
1278 | * in faults_memory and faults_cpu decay and these values are copied. | |
745d6147 | 1279 | */ |
5eca1c10 IM |
1280 | unsigned long *numa_faults; |
1281 | unsigned long total_numa_faults; | |
745d6147 | 1282 | |
04bb2f94 RR |
1283 | /* |
1284 | * numa_faults_locality tracks if faults recorded during the last | |
074c2381 MG |
1285 | * scan window were remote/local or failed to migrate. The task scan |
1286 | * period is adapted based on the locality of the faults with different | |
1287 | * weights depending on whether they were shared or private faults | |
04bb2f94 | 1288 | */ |
5eca1c10 | 1289 | unsigned long numa_faults_locality[3]; |
04bb2f94 | 1290 | |
5eca1c10 | 1291 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
1292 | #endif /* CONFIG_NUMA_BALANCING */ |
1293 | ||
d7822b1e MD |
1294 | #ifdef CONFIG_RSEQ |
1295 | struct rseq __user *rseq; | |
d7822b1e MD |
1296 | u32 rseq_sig; |
1297 | /* | |
1298 | * RmW on rseq_event_mask must be performed atomically | |
1299 | * with respect to preemption. | |
1300 | */ | |
1301 | unsigned long rseq_event_mask; | |
1302 | #endif | |
1303 | ||
5eca1c10 | 1304 | struct tlbflush_unmap_batch tlb_ubc; |
72b252ae | 1305 | |
3fbd7ee2 EB |
1306 | union { |
1307 | refcount_t rcu_users; | |
1308 | struct rcu_head rcu; | |
1309 | }; | |
b92ce558 | 1310 | |
5eca1c10 IM |
1311 | /* Cache last used pipe for splice(): */ |
1312 | struct pipe_inode_info *splice_pipe; | |
5640f768 | 1313 | |
5eca1c10 | 1314 | struct page_frag task_frag; |
5640f768 | 1315 | |
47913d4e IM |
1316 | #ifdef CONFIG_TASK_DELAY_ACCT |
1317 | struct task_delay_info *delays; | |
f4f154fd | 1318 | #endif |
47913d4e | 1319 | |
f4f154fd | 1320 | #ifdef CONFIG_FAULT_INJECTION |
5eca1c10 | 1321 | int make_it_fail; |
9049f2f6 | 1322 | unsigned int fail_nth; |
ca74e92b | 1323 | #endif |
9d823e8f | 1324 | /* |
5eca1c10 IM |
1325 | * When (nr_dirtied >= nr_dirtied_pause), it's time to call |
1326 | * balance_dirty_pages() for a dirty throttling pause: | |
9d823e8f | 1327 | */ |
5eca1c10 IM |
1328 | int nr_dirtied; |
1329 | int nr_dirtied_pause; | |
1330 | /* Start of a write-and-pause period: */ | |
1331 | unsigned long dirty_paused_when; | |
9d823e8f | 1332 | |
9745512c | 1333 | #ifdef CONFIG_LATENCYTOP |
5eca1c10 IM |
1334 | int latency_record_count; |
1335 | struct latency_record latency_record[LT_SAVECOUNT]; | |
9745512c | 1336 | #endif |
6976675d | 1337 | /* |
5eca1c10 | 1338 | * Time slack values; these are used to round up poll() and |
6976675d AV |
1339 | * select() etc timeout values. These are in nanoseconds. |
1340 | */ | |
5eca1c10 IM |
1341 | u64 timer_slack_ns; |
1342 | u64 default_timer_slack_ns; | |
f8d570a4 | 1343 | |
d73b4936 | 1344 | #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
5eca1c10 | 1345 | unsigned int kasan_depth; |
0b24becc | 1346 | #endif |
92c209ac | 1347 | |
dfd402a4 ME |
1348 | #ifdef CONFIG_KCSAN |
1349 | struct kcsan_ctx kcsan_ctx; | |
92c209ac ME |
1350 | #ifdef CONFIG_TRACE_IRQFLAGS |
1351 | struct irqtrace_events kcsan_save_irqtrace; | |
1352 | #endif | |
69562e49 ME |
1353 | #ifdef CONFIG_KCSAN_WEAK_MEMORY |
1354 | int kcsan_stack_depth; | |
1355 | #endif | |
dfd402a4 | 1356 | #endif |
5eca1c10 | 1357 | |
393824f6 PA |
1358 | #if IS_ENABLED(CONFIG_KUNIT) |
1359 | struct kunit *kunit_test; | |
1360 | #endif | |
1361 | ||
fb52607a | 1362 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
5eca1c10 IM |
1363 | /* Index of current stored address in ret_stack: */ |
1364 | int curr_ret_stack; | |
39eb456d | 1365 | int curr_ret_depth; |
5eca1c10 IM |
1366 | |
1367 | /* Stack of return addresses for return function tracing: */ | |
1368 | struct ftrace_ret_stack *ret_stack; | |
1369 | ||
1370 | /* Timestamp for last schedule: */ | |
1371 | unsigned long long ftrace_timestamp; | |
1372 | ||
f201ae23 FW |
1373 | /* |
1374 | * Number of functions that haven't been traced | |
5eca1c10 | 1375 | * because of depth overrun: |
f201ae23 | 1376 | */ |
5eca1c10 IM |
1377 | atomic_t trace_overrun; |
1378 | ||
1379 | /* Pause tracing: */ | |
1380 | atomic_t tracing_graph_pause; | |
f201ae23 | 1381 | #endif |
5eca1c10 | 1382 | |
ea4e2bc4 | 1383 | #ifdef CONFIG_TRACING |
5eca1c10 IM |
1384 | /* State flags for use by tracers: */ |
1385 | unsigned long trace; | |
1386 | ||
1387 | /* Bitmask and counter of trace recursion: */ | |
1388 | unsigned long trace_recursion; | |
261842b7 | 1389 | #endif /* CONFIG_TRACING */ |
5eca1c10 | 1390 | |
5c9a8750 | 1391 | #ifdef CONFIG_KCOV |
eec028c9 AK |
1392 | /* See kernel/kcov.c for more details. */ |
1393 | ||
5eca1c10 | 1394 | /* Coverage collection mode enabled for this task (0 if disabled): */ |
0ed557aa | 1395 | unsigned int kcov_mode; |
5eca1c10 IM |
1396 | |
1397 | /* Size of the kcov_area: */ | |
1398 | unsigned int kcov_size; | |
1399 | ||
1400 | /* Buffer for coverage collection: */ | |
1401 | void *kcov_area; | |
1402 | ||
1403 | /* KCOV descriptor wired with this task or NULL: */ | |
1404 | struct kcov *kcov; | |
eec028c9 AK |
1405 | |
1406 | /* KCOV common handle for remote coverage collection: */ | |
1407 | u64 kcov_handle; | |
1408 | ||
1409 | /* KCOV sequence number: */ | |
1410 | int kcov_sequence; | |
5ff3b30a AK |
1411 | |
1412 | /* Collect coverage from softirq context: */ | |
1413 | unsigned int kcov_softirq; | |
5c9a8750 | 1414 | #endif |
5eca1c10 | 1415 | |
6f185c29 | 1416 | #ifdef CONFIG_MEMCG |
5eca1c10 IM |
1417 | struct mem_cgroup *memcg_in_oom; |
1418 | gfp_t memcg_oom_gfp_mask; | |
1419 | int memcg_oom_order; | |
b23afb93 | 1420 | |
5eca1c10 IM |
1421 | /* Number of pages to reclaim on returning to userland: */ |
1422 | unsigned int memcg_nr_pages_over_high; | |
d46eb14b SB |
1423 | |
1424 | /* Used by memcontrol for targeted memcg charge: */ | |
1425 | struct mem_cgroup *active_memcg; | |
569b846d | 1426 | #endif |
5eca1c10 | 1427 | |
d09d8df3 JB |
1428 | #ifdef CONFIG_BLK_CGROUP |
1429 | struct request_queue *throttle_queue; | |
1430 | #endif | |
1431 | ||
0326f5a9 | 1432 | #ifdef CONFIG_UPROBES |
5eca1c10 | 1433 | struct uprobe_task *utask; |
0326f5a9 | 1434 | #endif |
cafe5635 | 1435 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
5eca1c10 IM |
1436 | unsigned int sequential_io; |
1437 | unsigned int sequential_io_avg; | |
cafe5635 | 1438 | #endif |
5fbda3ec | 1439 | struct kmap_ctrl kmap_ctrl; |
8eb23b9f | 1440 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
5eca1c10 | 1441 | unsigned long task_state_change; |
5f220be2 TG |
1442 | # ifdef CONFIG_PREEMPT_RT |
1443 | unsigned long saved_state_change; | |
1444 | # endif | |
8eb23b9f | 1445 | #endif |
5eca1c10 | 1446 | int pagefault_disabled; |
03049269 | 1447 | #ifdef CONFIG_MMU |
5eca1c10 | 1448 | struct task_struct *oom_reaper_list; |
e4a38402 | 1449 | struct timer_list oom_reaper_timer; |
03049269 | 1450 | #endif |
ba14a194 | 1451 | #ifdef CONFIG_VMAP_STACK |
5eca1c10 | 1452 | struct vm_struct *stack_vm_area; |
ba14a194 | 1453 | #endif |
68f24b08 | 1454 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
5eca1c10 | 1455 | /* A live task holds one reference: */ |
f0b89d39 | 1456 | refcount_t stack_refcount; |
d83a7cb3 JP |
1457 | #endif |
1458 | #ifdef CONFIG_LIVEPATCH | |
1459 | int patch_state; | |
0302e28d | 1460 | #endif |
e4e55b47 TH |
1461 | #ifdef CONFIG_SECURITY |
1462 | /* Used by LSM modules for access restriction: */ | |
1463 | void *security; | |
68f24b08 | 1464 | #endif |
a10787e6 SL |
1465 | #ifdef CONFIG_BPF_SYSCALL |
1466 | /* Used by BPF task local storage */ | |
1467 | struct bpf_local_storage __rcu *bpf_storage; | |
c7603cfa AN |
1468 | /* Used for BPF run context */ |
1469 | struct bpf_run_ctx *bpf_ctx; | |
a10787e6 | 1470 | #endif |
29e48ce8 | 1471 | |
afaef01c AP |
1472 | #ifdef CONFIG_GCC_PLUGIN_STACKLEAK |
1473 | unsigned long lowest_stack; | |
c8d12627 | 1474 | unsigned long prev_lowest_stack; |
afaef01c AP |
1475 | #endif |
1476 | ||
5567d11c | 1477 | #ifdef CONFIG_X86_MCE |
c0ab7ffc TL |
1478 | void __user *mce_vaddr; |
1479 | __u64 mce_kflags; | |
5567d11c | 1480 | u64 mce_addr; |
17fae129 TL |
1481 | __u64 mce_ripv : 1, |
1482 | mce_whole_page : 1, | |
1483 | __mce_reserved : 62; | |
5567d11c | 1484 | struct callback_head mce_kill_me; |
81065b35 | 1485 | int mce_count; |
5567d11c PZ |
1486 | #endif |
1487 | ||
d741bf41 PZ |
1488 | #ifdef CONFIG_KRETPROBES |
1489 | struct llist_head kretprobe_instances; | |
1490 | #endif | |
54ecbe6f MH |
1491 | #ifdef CONFIG_RETHOOK |
1492 | struct llist_head rethooks; | |
1493 | #endif | |
d741bf41 | 1494 | |
58e106e7 BS |
1495 | #ifdef CONFIG_ARCH_HAS_PARANOID_L1D_FLUSH |
1496 | /* | |
1497 | * If L1D flush is supported on mm context switch | |
1498 | * then we use this callback head to queue kill work | |
1499 | * to kill tasks that are not running on SMT disabled | |
1500 | * cores | |
1501 | */ | |
1502 | struct callback_head l1d_flush_kill; | |
1503 | #endif | |
1504 | ||
102227b9 DBO |
1505 | #ifdef CONFIG_RV |
1506 | /* | |
1507 | * Per-task RV monitor. Nowadays fixed in RV_PER_TASK_MONITORS. | |
1508 | * If we find justification for more monitors, we can think | |
1509 | * about adding more or developing a dynamic method. So far, | |
1510 | * none of these are justified. | |
1511 | */ | |
1512 | union rv_task_monitor rv[RV_PER_TASK_MONITORS]; | |
1513 | #endif | |
1514 | ||
29e48ce8 KC |
1515 | /* |
1516 | * New fields for task_struct should be added above here, so that | |
1517 | * they are included in the randomized portion of task_struct. | |
1518 | */ | |
1519 | randomized_struct_fields_end | |
1520 | ||
5eca1c10 IM |
1521 | /* CPU-specific state of this task: */ |
1522 | struct thread_struct thread; | |
1523 | ||
1524 | /* | |
1525 | * WARNING: on x86, 'thread_struct' contains a variable-sized | |
1526 | * structure. It *MUST* be at the end of 'task_struct'. | |
1527 | * | |
1528 | * Do not put anything below here! | |
1529 | */ | |
1da177e4 LT |
1530 | }; |
1531 | ||
e868171a | 1532 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 | 1533 | { |
2c470475 | 1534 | return task->thread_pid; |
22c935f4 EB |
1535 | } |
1536 | ||
7af57294 PE |
1537 | /* |
1538 | * the helpers to get the task's different pids as they are seen | |
1539 | * from various namespaces | |
1540 | * | |
1541 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1542 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1543 | * current. | |
7af57294 PE |
1544 | * task_xid_nr_ns() : id seen from the ns specified; |
1545 | * | |
7af57294 PE |
1546 | * see also pid_nr() etc in include/linux/pid.h |
1547 | */ | |
5eca1c10 | 1548 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns); |
7af57294 | 1549 | |
e868171a | 1550 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1551 | { |
1552 | return tsk->pid; | |
1553 | } | |
1554 | ||
5eca1c10 | 1555 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
52ee2dfd ON |
1556 | { |
1557 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1558 | } | |
7af57294 PE |
1559 | |
1560 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1561 | { | |
52ee2dfd | 1562 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1563 | } |
1564 | ||
1565 | ||
e868171a | 1566 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1567 | { |
1568 | return tsk->tgid; | |
1569 | } | |
1570 | ||
5eca1c10 IM |
1571 | /** |
1572 | * pid_alive - check that a task structure is not stale | |
1573 | * @p: Task structure to be checked. | |
1574 | * | |
1575 | * Test if a process is not yet dead (at most zombie state) | |
1576 | * If pid_alive fails, then pointers within the task structure | |
1577 | * can be stale and must not be dereferenced. | |
1578 | * | |
1579 | * Return: 1 if the process is alive. 0 otherwise. | |
1580 | */ | |
1581 | static inline int pid_alive(const struct task_struct *p) | |
1582 | { | |
2c470475 | 1583 | return p->thread_pid != NULL; |
5eca1c10 | 1584 | } |
7af57294 | 1585 | |
5eca1c10 | 1586 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
7af57294 | 1587 | { |
52ee2dfd | 1588 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1589 | } |
1590 | ||
7af57294 PE |
1591 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1592 | { | |
52ee2dfd | 1593 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1594 | } |
1595 | ||
1596 | ||
5eca1c10 | 1597 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
7af57294 | 1598 | { |
52ee2dfd | 1599 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1600 | } |
1601 | ||
7af57294 PE |
1602 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1603 | { | |
52ee2dfd | 1604 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1605 | } |
1606 | ||
dd1c1f2f ON |
1607 | static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
1608 | { | |
6883f81a | 1609 | return __task_pid_nr_ns(tsk, PIDTYPE_TGID, ns); |
dd1c1f2f ON |
1610 | } |
1611 | ||
1612 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1613 | { | |
6883f81a | 1614 | return __task_pid_nr_ns(tsk, PIDTYPE_TGID, NULL); |
dd1c1f2f ON |
1615 | } |
1616 | ||
1617 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) | |
1618 | { | |
1619 | pid_t pid = 0; | |
1620 | ||
1621 | rcu_read_lock(); | |
1622 | if (pid_alive(tsk)) | |
1623 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1624 | rcu_read_unlock(); | |
1625 | ||
1626 | return pid; | |
1627 | } | |
1628 | ||
1629 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1630 | { | |
1631 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1632 | } | |
1633 | ||
5eca1c10 | 1634 | /* Obsolete, do not use: */ |
1b0f7ffd ON |
1635 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) |
1636 | { | |
1637 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1638 | } | |
7af57294 | 1639 | |
06eb6184 PZ |
1640 | #define TASK_REPORT_IDLE (TASK_REPORT + 1) |
1641 | #define TASK_REPORT_MAX (TASK_REPORT_IDLE << 1) | |
1642 | ||
fa2c3254 VS |
1643 | static inline unsigned int __task_state_index(unsigned int tsk_state, |
1644 | unsigned int tsk_exit_state) | |
20435d84 | 1645 | { |
fa2c3254 | 1646 | unsigned int state = (tsk_state | tsk_exit_state) & TASK_REPORT; |
20435d84 | 1647 | |
06eb6184 PZ |
1648 | BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX); |
1649 | ||
06eb6184 PZ |
1650 | if (tsk_state == TASK_IDLE) |
1651 | state = TASK_REPORT_IDLE; | |
1652 | ||
25795ef6 VS |
1653 | /* |
1654 | * We're lying here, but rather than expose a completely new task state | |
1655 | * to userspace, we can make this appear as if the task has gone through | |
1656 | * a regular rt_mutex_lock() call. | |
1657 | */ | |
1658 | if (tsk_state == TASK_RTLOCK_WAIT) | |
1659 | state = TASK_UNINTERRUPTIBLE; | |
1660 | ||
1593baab PZ |
1661 | return fls(state); |
1662 | } | |
1663 | ||
fa2c3254 VS |
1664 | static inline unsigned int task_state_index(struct task_struct *tsk) |
1665 | { | |
1666 | return __task_state_index(READ_ONCE(tsk->__state), tsk->exit_state); | |
1667 | } | |
1668 | ||
1d48b080 | 1669 | static inline char task_index_to_char(unsigned int state) |
1593baab | 1670 | { |
8ef9925b | 1671 | static const char state_char[] = "RSDTtXZPI"; |
1593baab | 1672 | |
06eb6184 | 1673 | BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1); |
20435d84 | 1674 | |
1593baab PZ |
1675 | return state_char[state]; |
1676 | } | |
1677 | ||
1678 | static inline char task_state_to_char(struct task_struct *tsk) | |
1679 | { | |
1d48b080 | 1680 | return task_index_to_char(task_state_index(tsk)); |
20435d84 XX |
1681 | } |
1682 | ||
f400e198 | 1683 | /** |
570f5241 SS |
1684 | * is_global_init - check if a task structure is init. Since init |
1685 | * is free to have sub-threads we need to check tgid. | |
3260259f HK |
1686 | * @tsk: Task structure to be checked. |
1687 | * | |
1688 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1689 | * |
1690 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1691 | */ |
e868171a | 1692 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 | 1693 | { |
570f5241 | 1694 | return task_tgid_nr(tsk) == 1; |
b461cc03 | 1695 | } |
b460cbc5 | 1696 | |
9ec52099 CLG |
1697 | extern struct pid *cad_pid; |
1698 | ||
1da177e4 LT |
1699 | /* |
1700 | * Per process flags | |
1701 | */ | |
01ccf592 | 1702 | #define PF_VCPU 0x00000001 /* I'm a virtual CPU */ |
5eca1c10 IM |
1703 | #define PF_IDLE 0x00000002 /* I am an IDLE thread */ |
1704 | #define PF_EXITING 0x00000004 /* Getting shut down */ | |
92307383 | 1705 | #define PF_POSTCOREDUMP 0x00000008 /* Coredumps should ignore this task */ |
01ccf592 | 1706 | #define PF_IO_WORKER 0x00000010 /* Task is an IO worker */ |
5eca1c10 IM |
1707 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1708 | #define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */ | |
1709 | #define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */ | |
1710 | #define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */ | |
1711 | #define PF_DUMPCORE 0x00000200 /* Dumped core */ | |
1712 | #define PF_SIGNALED 0x00000400 /* Killed by a signal */ | |
1713 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1714 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */ | |
1715 | #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */ | |
5eca1c10 IM |
1716 | #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */ |
1717 | #define PF_FROZEN 0x00010000 /* Frozen for system suspend */ | |
7dea19f9 MH |
1718 | #define PF_KSWAPD 0x00020000 /* I am kswapd */ |
1719 | #define PF_MEMALLOC_NOFS 0x00040000 /* All allocation requests will inherit GFP_NOFS */ | |
1720 | #define PF_MEMALLOC_NOIO 0x00080000 /* All allocation requests will inherit GFP_NOIO */ | |
a37b0715 N |
1721 | #define PF_LOCAL_THROTTLE 0x00100000 /* Throttle writes only against the bdi I write to, |
1722 | * I am cleaning dirty pages from some other bdi. */ | |
5eca1c10 IM |
1723 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
1724 | #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */ | |
3bd37062 | 1725 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */ |
5eca1c10 | 1726 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
1a08ae36 | 1727 | #define PF_MEMALLOC_PIN 0x10000000 /* Allocation context constrained to zones which allow long term pinning. */ |
5eca1c10 IM |
1728 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
1729 | #define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */ | |
1da177e4 LT |
1730 | |
1731 | /* | |
1732 | * Only the _current_ task can read/write to tsk->flags, but other | |
1733 | * tasks can access tsk->flags in readonly mode for example | |
1734 | * with tsk_used_math (like during threaded core dumping). | |
1735 | * There is however an exception to this rule during ptrace | |
1736 | * or during fork: the ptracer task is allowed to write to the | |
1737 | * child->flags of its traced child (same goes for fork, the parent | |
1738 | * can write to the child->flags), because we're guaranteed the | |
1739 | * child is not running and in turn not changing child->flags | |
1740 | * at the same time the parent does it. | |
1741 | */ | |
5eca1c10 IM |
1742 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) |
1743 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1744 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1745 | #define set_used_math() set_stopped_child_used_math(current) | |
1746 | ||
1da177e4 LT |
1747 | #define conditional_stopped_child_used_math(condition, child) \ |
1748 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
5eca1c10 IM |
1749 | |
1750 | #define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current) | |
1751 | ||
1da177e4 LT |
1752 | #define copy_to_stopped_child_used_math(child) \ |
1753 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
5eca1c10 | 1754 | |
1da177e4 | 1755 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ |
5eca1c10 IM |
1756 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) |
1757 | #define used_math() tsk_used_math(current) | |
1da177e4 | 1758 | |
83d40a61 | 1759 | static __always_inline bool is_percpu_thread(void) |
62ec05dd TG |
1760 | { |
1761 | #ifdef CONFIG_SMP | |
1762 | return (current->flags & PF_NO_SETAFFINITY) && | |
1763 | (current->nr_cpus_allowed == 1); | |
1764 | #else | |
1765 | return true; | |
1766 | #endif | |
1767 | } | |
1768 | ||
1d4457f9 | 1769 | /* Per-process atomic flags. */ |
5eca1c10 IM |
1770 | #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ |
1771 | #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ | |
1772 | #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ | |
356e4bff TG |
1773 | #define PFA_SPEC_SSB_DISABLE 3 /* Speculative Store Bypass disabled */ |
1774 | #define PFA_SPEC_SSB_FORCE_DISABLE 4 /* Speculative Store Bypass force disabled*/ | |
9137bb27 TG |
1775 | #define PFA_SPEC_IB_DISABLE 5 /* Indirect branch speculation restricted */ |
1776 | #define PFA_SPEC_IB_FORCE_DISABLE 6 /* Indirect branch speculation permanently restricted */ | |
71368af9 | 1777 | #define PFA_SPEC_SSB_NOEXEC 7 /* Speculative Store Bypass clear on execve() */ |
1d4457f9 | 1778 | |
e0e5070b ZL |
1779 | #define TASK_PFA_TEST(name, func) \ |
1780 | static inline bool task_##func(struct task_struct *p) \ | |
1781 | { return test_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1782 | |
e0e5070b ZL |
1783 | #define TASK_PFA_SET(name, func) \ |
1784 | static inline void task_set_##func(struct task_struct *p) \ | |
1785 | { set_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1786 | |
e0e5070b ZL |
1787 | #define TASK_PFA_CLEAR(name, func) \ |
1788 | static inline void task_clear_##func(struct task_struct *p) \ | |
1789 | { clear_bit(PFA_##name, &p->atomic_flags); } | |
1790 | ||
1791 | TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) | |
1792 | TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) | |
1d4457f9 | 1793 | |
2ad654bc ZL |
1794 | TASK_PFA_TEST(SPREAD_PAGE, spread_page) |
1795 | TASK_PFA_SET(SPREAD_PAGE, spread_page) | |
1796 | TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) | |
1797 | ||
1798 | TASK_PFA_TEST(SPREAD_SLAB, spread_slab) | |
1799 | TASK_PFA_SET(SPREAD_SLAB, spread_slab) | |
1800 | TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) | |
1d4457f9 | 1801 | |
356e4bff TG |
1802 | TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable) |
1803 | TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable) | |
1804 | TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable) | |
1805 | ||
71368af9 WL |
1806 | TASK_PFA_TEST(SPEC_SSB_NOEXEC, spec_ssb_noexec) |
1807 | TASK_PFA_SET(SPEC_SSB_NOEXEC, spec_ssb_noexec) | |
1808 | TASK_PFA_CLEAR(SPEC_SSB_NOEXEC, spec_ssb_noexec) | |
1809 | ||
356e4bff TG |
1810 | TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) |
1811 | TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) | |
1812 | ||
9137bb27 TG |
1813 | TASK_PFA_TEST(SPEC_IB_DISABLE, spec_ib_disable) |
1814 | TASK_PFA_SET(SPEC_IB_DISABLE, spec_ib_disable) | |
1815 | TASK_PFA_CLEAR(SPEC_IB_DISABLE, spec_ib_disable) | |
1816 | ||
1817 | TASK_PFA_TEST(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable) | |
1818 | TASK_PFA_SET(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable) | |
1819 | ||
5eca1c10 | 1820 | static inline void |
717a94b5 | 1821 | current_restore_flags(unsigned long orig_flags, unsigned long flags) |
907aed48 | 1822 | { |
717a94b5 N |
1823 | current->flags &= ~flags; |
1824 | current->flags |= orig_flags & flags; | |
907aed48 MG |
1825 | } |
1826 | ||
5eca1c10 | 1827 | extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial); |
b6e8d40d | 1828 | extern int task_can_attach(struct task_struct *p, const struct cpumask *cs_effective_cpus); |
1da177e4 | 1829 | #ifdef CONFIG_SMP |
5eca1c10 IM |
1830 | extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask); |
1831 | extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask); | |
b90ca8ba WD |
1832 | extern int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node); |
1833 | extern void release_user_cpus_ptr(struct task_struct *p); | |
234b8ab6 | 1834 | extern int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask); |
07ec77a1 WD |
1835 | extern void force_compatible_cpus_allowed_ptr(struct task_struct *p); |
1836 | extern void relax_compatible_cpus_allowed_ptr(struct task_struct *p); | |
1da177e4 | 1837 | #else |
5eca1c10 | 1838 | static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) |
1e1b6c51 KM |
1839 | { |
1840 | } | |
5eca1c10 | 1841 | static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask) |
1da177e4 | 1842 | { |
96f874e2 | 1843 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1844 | return -EINVAL; |
1845 | return 0; | |
1846 | } | |
b90ca8ba WD |
1847 | static inline int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node) |
1848 | { | |
1849 | if (src->user_cpus_ptr) | |
1850 | return -EINVAL; | |
1851 | return 0; | |
1852 | } | |
1853 | static inline void release_user_cpus_ptr(struct task_struct *p) | |
1854 | { | |
1855 | WARN_ON(p->user_cpus_ptr); | |
1856 | } | |
234b8ab6 WD |
1857 | |
1858 | static inline int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask) | |
1859 | { | |
1860 | return 0; | |
1861 | } | |
1da177e4 | 1862 | #endif |
e0ad9556 | 1863 | |
fa93384f | 1864 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
1865 | extern void set_user_nice(struct task_struct *p, long nice); |
1866 | extern int task_prio(const struct task_struct *p); | |
5eca1c10 | 1867 | |
d0ea0268 DY |
1868 | /** |
1869 | * task_nice - return the nice value of a given task. | |
1870 | * @p: the task in question. | |
1871 | * | |
1872 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
1873 | */ | |
1874 | static inline int task_nice(const struct task_struct *p) | |
1875 | { | |
1876 | return PRIO_TO_NICE((p)->static_prio); | |
1877 | } | |
5eca1c10 | 1878 | |
36c8b586 IM |
1879 | extern int can_nice(const struct task_struct *p, const int nice); |
1880 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 1881 | extern int idle_cpu(int cpu); |
943d355d | 1882 | extern int available_idle_cpu(int cpu); |
5eca1c10 IM |
1883 | extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *); |
1884 | extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *); | |
8b700983 PZ |
1885 | extern void sched_set_fifo(struct task_struct *p); |
1886 | extern void sched_set_fifo_low(struct task_struct *p); | |
1887 | extern void sched_set_normal(struct task_struct *p, int nice); | |
5eca1c10 | 1888 | extern int sched_setattr(struct task_struct *, const struct sched_attr *); |
794a56eb | 1889 | extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *); |
36c8b586 | 1890 | extern struct task_struct *idle_task(int cpu); |
5eca1c10 | 1891 | |
c4f30608 PM |
1892 | /** |
1893 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 1894 | * @p: the task in question. |
e69f6186 YB |
1895 | * |
1896 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 1897 | */ |
c94a88f3 | 1898 | static __always_inline bool is_idle_task(const struct task_struct *p) |
c4f30608 | 1899 | { |
c1de45ca | 1900 | return !!(p->flags & PF_IDLE); |
c4f30608 | 1901 | } |
5eca1c10 | 1902 | |
36c8b586 | 1903 | extern struct task_struct *curr_task(int cpu); |
a458ae2e | 1904 | extern void ia64_set_curr_task(int cpu, struct task_struct *p); |
1da177e4 LT |
1905 | |
1906 | void yield(void); | |
1907 | ||
1da177e4 | 1908 | union thread_union { |
0500871f DH |
1909 | #ifndef CONFIG_ARCH_TASK_STRUCT_ON_STACK |
1910 | struct task_struct task; | |
1911 | #endif | |
c65eacbe | 1912 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1da177e4 | 1913 | struct thread_info thread_info; |
c65eacbe | 1914 | #endif |
1da177e4 LT |
1915 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
1916 | }; | |
1917 | ||
0500871f DH |
1918 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1919 | extern struct thread_info init_thread_info; | |
1920 | #endif | |
1921 | ||
1922 | extern unsigned long init_stack[THREAD_SIZE / sizeof(unsigned long)]; | |
1923 | ||
f3ac6067 | 1924 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
bcf9033e | 1925 | # define task_thread_info(task) (&(task)->thread_info) |
f3ac6067 IM |
1926 | #elif !defined(__HAVE_THREAD_FUNCTIONS) |
1927 | # define task_thread_info(task) ((struct thread_info *)(task)->stack) | |
1928 | #endif | |
1929 | ||
198fe21b PE |
1930 | /* |
1931 | * find a task by one of its numerical ids | |
1932 | * | |
198fe21b PE |
1933 | * find_task_by_pid_ns(): |
1934 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1935 | * find_task_by_vpid(): |
1936 | * finds a task by its virtual pid | |
198fe21b | 1937 | * |
e49859e7 | 1938 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
1939 | */ |
1940 | ||
228ebcbe | 1941 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
5eca1c10 | 1942 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns); |
198fe21b | 1943 | |
2ee08260 MR |
1944 | /* |
1945 | * find a task by its virtual pid and get the task struct | |
1946 | */ | |
1947 | extern struct task_struct *find_get_task_by_vpid(pid_t nr); | |
1948 | ||
b3c97528 HH |
1949 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
1950 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 1951 | extern void wake_up_new_task(struct task_struct *tsk); |
5eca1c10 | 1952 | |
1da177e4 | 1953 | #ifdef CONFIG_SMP |
5eca1c10 | 1954 | extern void kick_process(struct task_struct *tsk); |
1da177e4 | 1955 | #else |
5eca1c10 | 1956 | static inline void kick_process(struct task_struct *tsk) { } |
1da177e4 | 1957 | #endif |
1da177e4 | 1958 | |
82b89778 | 1959 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
5eca1c10 | 1960 | |
82b89778 AH |
1961 | static inline void set_task_comm(struct task_struct *tsk, const char *from) |
1962 | { | |
1963 | __set_task_comm(tsk, from, false); | |
1964 | } | |
5eca1c10 | 1965 | |
3756f640 AB |
1966 | extern char *__get_task_comm(char *to, size_t len, struct task_struct *tsk); |
1967 | #define get_task_comm(buf, tsk) ({ \ | |
1968 | BUILD_BUG_ON(sizeof(buf) != TASK_COMM_LEN); \ | |
1969 | __get_task_comm(buf, sizeof(buf), tsk); \ | |
1970 | }) | |
1da177e4 LT |
1971 | |
1972 | #ifdef CONFIG_SMP | |
2a0a24eb TG |
1973 | static __always_inline void scheduler_ipi(void) |
1974 | { | |
1975 | /* | |
1976 | * Fold TIF_NEED_RESCHED into the preempt_count; anybody setting | |
1977 | * TIF_NEED_RESCHED remotely (for the first time) will also send | |
1978 | * this IPI. | |
1979 | */ | |
1980 | preempt_fold_need_resched(); | |
1981 | } | |
2f064a59 | 1982 | extern unsigned long wait_task_inactive(struct task_struct *, unsigned int match_state); |
1da177e4 | 1983 | #else |
184748cc | 1984 | static inline void scheduler_ipi(void) { } |
2f064a59 | 1985 | static inline unsigned long wait_task_inactive(struct task_struct *p, unsigned int match_state) |
85ba2d86 RM |
1986 | { |
1987 | return 1; | |
1988 | } | |
1da177e4 LT |
1989 | #endif |
1990 | ||
5eca1c10 IM |
1991 | /* |
1992 | * Set thread flags in other task's structures. | |
1993 | * See asm/thread_info.h for TIF_xxxx flags available: | |
1da177e4 LT |
1994 | */ |
1995 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1996 | { | |
a1261f54 | 1997 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1998 | } |
1999 | ||
2000 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2001 | { | |
a1261f54 | 2002 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2003 | } |
2004 | ||
93ee37c2 DM |
2005 | static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag, |
2006 | bool value) | |
2007 | { | |
2008 | update_ti_thread_flag(task_thread_info(tsk), flag, value); | |
2009 | } | |
2010 | ||
1da177e4 LT |
2011 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
2012 | { | |
a1261f54 | 2013 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2014 | } |
2015 | ||
2016 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2017 | { | |
a1261f54 | 2018 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2019 | } |
2020 | ||
2021 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2022 | { | |
a1261f54 | 2023 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2024 | } |
2025 | ||
2026 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2027 | { | |
2028 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2029 | } | |
2030 | ||
2031 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2032 | { | |
2033 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2034 | } | |
2035 | ||
8ae121ac GH |
2036 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2037 | { | |
2038 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2039 | } | |
2040 | ||
1da177e4 LT |
2041 | /* |
2042 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2043 | * explicit rescheduling in places that are safe. The return | |
2044 | * value indicates whether a reschedule was done in fact. | |
2045 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1da177e4 | 2046 | */ |
b965f1dd PZI |
2047 | #if !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC) |
2048 | extern int __cond_resched(void); | |
2049 | ||
99cf983c | 2050 | #if defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_CALL) |
b965f1dd PZI |
2051 | |
2052 | DECLARE_STATIC_CALL(cond_resched, __cond_resched); | |
2053 | ||
2054 | static __always_inline int _cond_resched(void) | |
2055 | { | |
ef72661e | 2056 | return static_call_mod(cond_resched)(); |
b965f1dd PZI |
2057 | } |
2058 | ||
99cf983c MR |
2059 | #elif defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY) |
2060 | extern int dynamic_cond_resched(void); | |
2061 | ||
2062 | static __always_inline int _cond_resched(void) | |
2063 | { | |
2064 | return dynamic_cond_resched(); | |
2065 | } | |
2066 | ||
35a773a0 | 2067 | #else |
b965f1dd PZI |
2068 | |
2069 | static inline int _cond_resched(void) | |
2070 | { | |
2071 | return __cond_resched(); | |
2072 | } | |
2073 | ||
2074 | #endif /* CONFIG_PREEMPT_DYNAMIC */ | |
2075 | ||
2076 | #else | |
2077 | ||
35a773a0 | 2078 | static inline int _cond_resched(void) { return 0; } |
b965f1dd PZI |
2079 | |
2080 | #endif /* !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC) */ | |
6f80bd98 | 2081 | |
613afbf8 | 2082 | #define cond_resched() ({ \ |
874f670e | 2083 | __might_resched(__FILE__, __LINE__, 0); \ |
613afbf8 FW |
2084 | _cond_resched(); \ |
2085 | }) | |
6f80bd98 | 2086 | |
613afbf8 | 2087 | extern int __cond_resched_lock(spinlock_t *lock); |
f3d4b4b1 BG |
2088 | extern int __cond_resched_rwlock_read(rwlock_t *lock); |
2089 | extern int __cond_resched_rwlock_write(rwlock_t *lock); | |
613afbf8 | 2090 | |
50e081b9 TG |
2091 | #define MIGHT_RESCHED_RCU_SHIFT 8 |
2092 | #define MIGHT_RESCHED_PREEMPT_MASK ((1U << MIGHT_RESCHED_RCU_SHIFT) - 1) | |
2093 | ||
3e9cc688 TG |
2094 | #ifndef CONFIG_PREEMPT_RT |
2095 | /* | |
2096 | * Non RT kernels have an elevated preempt count due to the held lock, | |
2097 | * but are not allowed to be inside a RCU read side critical section | |
2098 | */ | |
2099 | # define PREEMPT_LOCK_RESCHED_OFFSETS PREEMPT_LOCK_OFFSET | |
2100 | #else | |
2101 | /* | |
2102 | * spin/rw_lock() on RT implies rcu_read_lock(). The might_sleep() check in | |
2103 | * cond_resched*lock() has to take that into account because it checks for | |
2104 | * preempt_count() and rcu_preempt_depth(). | |
2105 | */ | |
2106 | # define PREEMPT_LOCK_RESCHED_OFFSETS \ | |
2107 | (PREEMPT_LOCK_OFFSET + (1U << MIGHT_RESCHED_RCU_SHIFT)) | |
2108 | #endif | |
2109 | ||
2110 | #define cond_resched_lock(lock) ({ \ | |
2111 | __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \ | |
2112 | __cond_resched_lock(lock); \ | |
613afbf8 FW |
2113 | }) |
2114 | ||
3e9cc688 TG |
2115 | #define cond_resched_rwlock_read(lock) ({ \ |
2116 | __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \ | |
2117 | __cond_resched_rwlock_read(lock); \ | |
f3d4b4b1 BG |
2118 | }) |
2119 | ||
3e9cc688 TG |
2120 | #define cond_resched_rwlock_write(lock) ({ \ |
2121 | __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \ | |
2122 | __cond_resched_rwlock_write(lock); \ | |
f3d4b4b1 BG |
2123 | }) |
2124 | ||
f6f3c437 SH |
2125 | static inline void cond_resched_rcu(void) |
2126 | { | |
2127 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
2128 | rcu_read_unlock(); | |
2129 | cond_resched(); | |
2130 | rcu_read_lock(); | |
2131 | #endif | |
2132 | } | |
2133 | ||
cfe43f47 VS |
2134 | #ifdef CONFIG_PREEMPT_DYNAMIC |
2135 | ||
2136 | extern bool preempt_model_none(void); | |
2137 | extern bool preempt_model_voluntary(void); | |
2138 | extern bool preempt_model_full(void); | |
2139 | ||
2140 | #else | |
2141 | ||
2142 | static inline bool preempt_model_none(void) | |
2143 | { | |
2144 | return IS_ENABLED(CONFIG_PREEMPT_NONE); | |
2145 | } | |
2146 | static inline bool preempt_model_voluntary(void) | |
2147 | { | |
2148 | return IS_ENABLED(CONFIG_PREEMPT_VOLUNTARY); | |
2149 | } | |
2150 | static inline bool preempt_model_full(void) | |
2151 | { | |
2152 | return IS_ENABLED(CONFIG_PREEMPT); | |
2153 | } | |
2154 | ||
2155 | #endif | |
2156 | ||
2157 | static inline bool preempt_model_rt(void) | |
2158 | { | |
2159 | return IS_ENABLED(CONFIG_PREEMPT_RT); | |
2160 | } | |
2161 | ||
2162 | /* | |
2163 | * Does the preemption model allow non-cooperative preemption? | |
2164 | * | |
2165 | * For !CONFIG_PREEMPT_DYNAMIC kernels this is an exact match with | |
2166 | * CONFIG_PREEMPTION; for CONFIG_PREEMPT_DYNAMIC this doesn't work as the | |
2167 | * kernel is *built* with CONFIG_PREEMPTION=y but may run with e.g. the | |
2168 | * PREEMPT_NONE model. | |
2169 | */ | |
2170 | static inline bool preempt_model_preemptible(void) | |
2171 | { | |
2172 | return preempt_model_full() || preempt_model_rt(); | |
2173 | } | |
2174 | ||
1da177e4 LT |
2175 | /* |
2176 | * Does a critical section need to be broken due to another | |
c1a280b6 | 2177 | * task waiting?: (technically does not depend on CONFIG_PREEMPTION, |
95c354fe | 2178 | * but a general need for low latency) |
1da177e4 | 2179 | */ |
95c354fe | 2180 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2181 | { |
c1a280b6 | 2182 | #ifdef CONFIG_PREEMPTION |
95c354fe NP |
2183 | return spin_is_contended(lock); |
2184 | #else | |
1da177e4 | 2185 | return 0; |
95c354fe | 2186 | #endif |
1da177e4 LT |
2187 | } |
2188 | ||
a09a689a BG |
2189 | /* |
2190 | * Check if a rwlock is contended. | |
2191 | * Returns non-zero if there is another task waiting on the rwlock. | |
2192 | * Returns zero if the lock is not contended or the system / underlying | |
2193 | * rwlock implementation does not support contention detection. | |
2194 | * Technically does not depend on CONFIG_PREEMPTION, but a general need | |
2195 | * for low latency. | |
2196 | */ | |
2197 | static inline int rwlock_needbreak(rwlock_t *lock) | |
2198 | { | |
2199 | #ifdef CONFIG_PREEMPTION | |
2200 | return rwlock_is_contended(lock); | |
2201 | #else | |
2202 | return 0; | |
2203 | #endif | |
2204 | } | |
2205 | ||
75f93fed PZ |
2206 | static __always_inline bool need_resched(void) |
2207 | { | |
2208 | return unlikely(tif_need_resched()); | |
2209 | } | |
2210 | ||
1da177e4 LT |
2211 | /* |
2212 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2213 | */ | |
2214 | #ifdef CONFIG_SMP | |
2215 | ||
2216 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2217 | { | |
c546951d | 2218 | return READ_ONCE(task_thread_info(p)->cpu); |
1da177e4 LT |
2219 | } |
2220 | ||
c65cc870 | 2221 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2222 | |
2223 | #else | |
2224 | ||
2225 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2226 | { | |
2227 | return 0; | |
2228 | } | |
2229 | ||
2230 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2231 | { | |
2232 | } | |
2233 | ||
2234 | #endif /* CONFIG_SMP */ | |
2235 | ||
a1dfb631 | 2236 | extern bool sched_task_on_rq(struct task_struct *p); |
42a20f86 | 2237 | extern unsigned long get_wchan(struct task_struct *p); |
e386b672 | 2238 | extern struct task_struct *cpu_curr_snapshot(int cpu); |
a1dfb631 | 2239 | |
d9345c65 PX |
2240 | /* |
2241 | * In order to reduce various lock holder preemption latencies provide an | |
2242 | * interface to see if a vCPU is currently running or not. | |
2243 | * | |
2244 | * This allows us to terminate optimistic spin loops and block, analogous to | |
2245 | * the native optimistic spin heuristic of testing if the lock owner task is | |
2246 | * running or not. | |
2247 | */ | |
2248 | #ifndef vcpu_is_preempted | |
42fd8baa QC |
2249 | static inline bool vcpu_is_preempted(int cpu) |
2250 | { | |
2251 | return false; | |
2252 | } | |
d9345c65 PX |
2253 | #endif |
2254 | ||
96f874e2 RR |
2255 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2256 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2257 | |
82455257 DH |
2258 | #ifndef TASK_SIZE_OF |
2259 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2260 | #endif | |
2261 | ||
a5418be9 | 2262 | #ifdef CONFIG_SMP |
c0bed69d KW |
2263 | static inline bool owner_on_cpu(struct task_struct *owner) |
2264 | { | |
2265 | /* | |
2266 | * As lock holder preemption issue, we both skip spinning if | |
2267 | * task is not on cpu or its cpu is preempted | |
2268 | */ | |
4cf75fd4 | 2269 | return READ_ONCE(owner->on_cpu) && !vcpu_is_preempted(task_cpu(owner)); |
c0bed69d KW |
2270 | } |
2271 | ||
a5418be9 | 2272 | /* Returns effective CPU energy utilization, as seen by the scheduler */ |
bb447999 | 2273 | unsigned long sched_cpu_util(int cpu); |
a5418be9 VK |
2274 | #endif /* CONFIG_SMP */ |
2275 | ||
d7822b1e MD |
2276 | #ifdef CONFIG_RSEQ |
2277 | ||
2278 | /* | |
2279 | * Map the event mask on the user-space ABI enum rseq_cs_flags | |
2280 | * for direct mask checks. | |
2281 | */ | |
2282 | enum rseq_event_mask_bits { | |
2283 | RSEQ_EVENT_PREEMPT_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT, | |
2284 | RSEQ_EVENT_SIGNAL_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT, | |
2285 | RSEQ_EVENT_MIGRATE_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT, | |
2286 | }; | |
2287 | ||
2288 | enum rseq_event_mask { | |
2289 | RSEQ_EVENT_PREEMPT = (1U << RSEQ_EVENT_PREEMPT_BIT), | |
2290 | RSEQ_EVENT_SIGNAL = (1U << RSEQ_EVENT_SIGNAL_BIT), | |
2291 | RSEQ_EVENT_MIGRATE = (1U << RSEQ_EVENT_MIGRATE_BIT), | |
2292 | }; | |
2293 | ||
2294 | static inline void rseq_set_notify_resume(struct task_struct *t) | |
2295 | { | |
2296 | if (t->rseq) | |
2297 | set_tsk_thread_flag(t, TIF_NOTIFY_RESUME); | |
2298 | } | |
2299 | ||
784e0300 | 2300 | void __rseq_handle_notify_resume(struct ksignal *sig, struct pt_regs *regs); |
d7822b1e | 2301 | |
784e0300 WD |
2302 | static inline void rseq_handle_notify_resume(struct ksignal *ksig, |
2303 | struct pt_regs *regs) | |
d7822b1e MD |
2304 | { |
2305 | if (current->rseq) | |
784e0300 | 2306 | __rseq_handle_notify_resume(ksig, 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 | preempt_disable(); | |
2313 | __set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask); | |
2314 | preempt_enable(); | |
784e0300 | 2315 | rseq_handle_notify_resume(ksig, regs); |
d7822b1e MD |
2316 | } |
2317 | ||
2318 | /* rseq_preempt() requires preemption to be disabled. */ | |
2319 | static inline void rseq_preempt(struct task_struct *t) | |
2320 | { | |
2321 | __set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask); | |
2322 | rseq_set_notify_resume(t); | |
2323 | } | |
2324 | ||
2325 | /* rseq_migrate() requires preemption to be disabled. */ | |
2326 | static inline void rseq_migrate(struct task_struct *t) | |
2327 | { | |
2328 | __set_bit(RSEQ_EVENT_MIGRATE_BIT, &t->rseq_event_mask); | |
2329 | rseq_set_notify_resume(t); | |
2330 | } | |
2331 | ||
2332 | /* | |
2333 | * If parent process has a registered restartable sequences area, the | |
463f550f | 2334 | * child inherits. Unregister rseq for a clone with CLONE_VM set. |
d7822b1e MD |
2335 | */ |
2336 | static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) | |
2337 | { | |
463f550f | 2338 | if (clone_flags & CLONE_VM) { |
d7822b1e | 2339 | t->rseq = NULL; |
d7822b1e MD |
2340 | t->rseq_sig = 0; |
2341 | t->rseq_event_mask = 0; | |
2342 | } else { | |
2343 | t->rseq = current->rseq; | |
d7822b1e MD |
2344 | t->rseq_sig = current->rseq_sig; |
2345 | t->rseq_event_mask = current->rseq_event_mask; | |
d7822b1e MD |
2346 | } |
2347 | } | |
2348 | ||
2349 | static inline void rseq_execve(struct task_struct *t) | |
2350 | { | |
2351 | t->rseq = NULL; | |
d7822b1e MD |
2352 | t->rseq_sig = 0; |
2353 | t->rseq_event_mask = 0; | |
2354 | } | |
2355 | ||
2356 | #else | |
2357 | ||
2358 | static inline void rseq_set_notify_resume(struct task_struct *t) | |
2359 | { | |
2360 | } | |
784e0300 WD |
2361 | static inline void rseq_handle_notify_resume(struct ksignal *ksig, |
2362 | struct pt_regs *regs) | |
d7822b1e MD |
2363 | { |
2364 | } | |
784e0300 WD |
2365 | static inline void rseq_signal_deliver(struct ksignal *ksig, |
2366 | struct pt_regs *regs) | |
d7822b1e MD |
2367 | { |
2368 | } | |
2369 | static inline void rseq_preempt(struct task_struct *t) | |
2370 | { | |
2371 | } | |
2372 | static inline void rseq_migrate(struct task_struct *t) | |
2373 | { | |
2374 | } | |
2375 | static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) | |
2376 | { | |
2377 | } | |
2378 | static inline void rseq_execve(struct task_struct *t) | |
2379 | { | |
2380 | } | |
2381 | ||
2382 | #endif | |
2383 | ||
2384 | #ifdef CONFIG_DEBUG_RSEQ | |
2385 | ||
2386 | void rseq_syscall(struct pt_regs *regs); | |
2387 | ||
2388 | #else | |
2389 | ||
2390 | static inline void rseq_syscall(struct pt_regs *regs) | |
2391 | { | |
2392 | } | |
2393 | ||
2394 | #endif | |
2395 | ||
6e33cad0 PZ |
2396 | #ifdef CONFIG_SCHED_CORE |
2397 | extern void sched_core_free(struct task_struct *tsk); | |
85dd3f61 | 2398 | extern void sched_core_fork(struct task_struct *p); |
7ac592aa CH |
2399 | extern int sched_core_share_pid(unsigned int cmd, pid_t pid, enum pid_type type, |
2400 | unsigned long uaddr); | |
6e33cad0 PZ |
2401 | #else |
2402 | static inline void sched_core_free(struct task_struct *tsk) { } | |
85dd3f61 | 2403 | static inline void sched_core_fork(struct task_struct *p) { } |
6e33cad0 PZ |
2404 | #endif |
2405 | ||
d664e399 TG |
2406 | extern void sched_set_stop_task(int cpu, struct task_struct *stop); |
2407 | ||
1da177e4 | 2408 | #endif |