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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> |
1e2f2d31 KO |
13 | #include <asm/processor.h> |
14 | #include <linux/thread_info.h> | |
15 | #include <linux/preempt.h> | |
16 | #include <linux/cpumask.h> | |
1da177e4 | 17 | |
e034d49e | 18 | #include <linux/cache.h> |
9983deb2 | 19 | #include <linux/irqflags_types.h> |
1e2f2d31 | 20 | #include <linux/smp_types.h> |
6d5e9d63 | 21 | #include <linux/pid_types.h> |
e034d49e | 22 | #include <linux/sem_types.h> |
ab602f79 | 23 | #include <linux/shm.h> |
f80be457 | 24 | #include <linux/kmsan_types.h> |
d84f3179 | 25 | #include <linux/mutex_types.h> |
8b7787a5 | 26 | #include <linux/plist_types.h> |
50d91c76 | 27 | #include <linux/hrtimer_types.h> |
e034d49e | 28 | #include <linux/timer_types.h> |
a6e1420c | 29 | #include <linux/seccomp_types.h> |
bea32141 | 30 | #include <linux/nodemask_types.h> |
f9d6966b | 31 | #include <linux/refcount_types.h> |
a3b6714e | 32 | #include <linux/resource.h> |
9745512c | 33 | #include <linux/latencytop.h> |
5eca1c10 | 34 | #include <linux/sched/prio.h> |
9eacb5c7 | 35 | #include <linux/sched/types.h> |
5eca1c10 | 36 | #include <linux/signal_types.h> |
55b899aa | 37 | #include <linux/syscall_user_dispatch_types.h> |
5eca1c10 IM |
38 | #include <linux/mm_types_task.h> |
39 | #include <linux/task_io_accounting.h> | |
53d31ba8 | 40 | #include <linux/posix-timers_types.h> |
cba6167f | 41 | #include <linux/restart_block.h> |
932562a6 | 42 | #include <uapi/linux/rseq.h> |
f038cc13 | 43 | #include <linux/seqlock_types.h> |
dfd402a4 | 44 | #include <linux/kcsan.h> |
102227b9 | 45 | #include <linux/rv.h> |
e3ff7c60 | 46 | #include <linux/livepatch_sched.h> |
af6da56a | 47 | #include <linux/uidgid_types.h> |
5fbda3ec | 48 | #include <asm/kmap_size.h> |
a3b6714e | 49 | |
5eca1c10 | 50 | /* task_struct member predeclarations (sorted alphabetically): */ |
c7af7877 | 51 | struct audit_context; |
bddd87c7 | 52 | struct bio_list; |
73c10101 | 53 | struct blk_plug; |
a10787e6 | 54 | struct bpf_local_storage; |
c7603cfa | 55 | struct bpf_run_ctx; |
3c93a0c0 | 56 | struct capture_control; |
c7af7877 | 57 | struct cfs_rq; |
c7af7877 IM |
58 | struct fs_struct; |
59 | struct futex_pi_state; | |
60 | struct io_context; | |
1875dc5b | 61 | struct io_uring_task; |
c7af7877 | 62 | struct mempolicy; |
89076bc3 | 63 | struct nameidata; |
c7af7877 IM |
64 | struct nsproxy; |
65 | struct perf_event_context; | |
66 | struct pid_namespace; | |
67 | struct pipe_inode_info; | |
68 | struct rcu_node; | |
69 | struct reclaim_state; | |
70 | struct robust_list_head; | |
3c93a0c0 QY |
71 | struct root_domain; |
72 | struct rq; | |
c7af7877 | 73 | struct sched_attr; |
63ba8422 | 74 | struct sched_dl_entity; |
43ae34cb | 75 | struct seq_file; |
c7af7877 IM |
76 | struct sighand_struct; |
77 | struct signal_struct; | |
78 | struct task_delay_info; | |
4cf86d77 | 79 | struct task_group; |
63ba8422 | 80 | struct task_struct; |
fd593511 | 81 | struct user_event_mm; |
1da177e4 | 82 | |
4a8342d2 LT |
83 | /* |
84 | * Task state bitmask. NOTE! These bits are also | |
85 | * encoded in fs/proc/array.c: get_task_state(). | |
86 | * | |
48b55837 | 87 | * We have two separate sets of flags: task->__state |
4a8342d2 LT |
88 | * is about runnability, while task->exit_state are |
89 | * about the task exiting. Confusing, but this way | |
90 | * modifying one set can't modify the other one by | |
91 | * mistake. | |
92 | */ | |
5eca1c10 | 93 | |
48b55837 | 94 | /* Used in tsk->__state: */ |
9963e444 PZ |
95 | #define TASK_RUNNING 0x00000000 |
96 | #define TASK_INTERRUPTIBLE 0x00000001 | |
97 | #define TASK_UNINTERRUPTIBLE 0x00000002 | |
98 | #define __TASK_STOPPED 0x00000004 | |
99 | #define __TASK_TRACED 0x00000008 | |
5eca1c10 | 100 | /* Used in tsk->exit_state: */ |
9963e444 PZ |
101 | #define EXIT_DEAD 0x00000010 |
102 | #define EXIT_ZOMBIE 0x00000020 | |
5eca1c10 | 103 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) |
48b55837 | 104 | /* Used in tsk->__state again: */ |
9963e444 PZ |
105 | #define TASK_PARKED 0x00000040 |
106 | #define TASK_DEAD 0x00000080 | |
107 | #define TASK_WAKEKILL 0x00000100 | |
108 | #define TASK_WAKING 0x00000200 | |
109 | #define TASK_NOLOAD 0x00000400 | |
110 | #define TASK_NEW 0x00000800 | |
9963e444 | 111 | #define TASK_RTLOCK_WAIT 0x00001000 |
f5d39b02 PZ |
112 | #define TASK_FREEZABLE 0x00002000 |
113 | #define __TASK_FREEZABLE_UNSAFE (0x00004000 * IS_ENABLED(CONFIG_LOCKDEP)) | |
114 | #define TASK_FROZEN 0x00008000 | |
115 | #define TASK_STATE_MAX 0x00010000 | |
5eca1c10 | 116 | |
f9fc8cad PZ |
117 | #define TASK_ANY (TASK_STATE_MAX-1) |
118 | ||
f5d39b02 PZ |
119 | /* |
120 | * DO NOT ADD ANY NEW USERS ! | |
121 | */ | |
122 | #define TASK_FREEZABLE_UNSAFE (TASK_FREEZABLE | __TASK_FREEZABLE_UNSAFE) | |
5eca1c10 | 123 | |
5eca1c10 IM |
124 | /* Convenience macros for the sake of set_current_state: */ |
125 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
126 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
2500ad1c | 127 | #define TASK_TRACED __TASK_TRACED |
5eca1c10 IM |
128 | |
129 | #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD) | |
130 | ||
131 | /* Convenience macros for the sake of wake_up(): */ | |
132 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
5eca1c10 IM |
133 | |
134 | /* get_task_state(): */ | |
135 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
136 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ | |
8ef9925b PZ |
137 | __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \ |
138 | TASK_PARKED) | |
5eca1c10 | 139 | |
2f064a59 | 140 | #define task_is_running(task) (READ_ONCE((task)->__state) == TASK_RUNNING) |
5eca1c10 | 141 | |
31cae1ea PZ |
142 | #define task_is_traced(task) ((READ_ONCE(task->jobctl) & JOBCTL_TRACED) != 0) |
143 | #define task_is_stopped(task) ((READ_ONCE(task->jobctl) & JOBCTL_STOPPED) != 0) | |
144 | #define task_is_stopped_or_traced(task) ((READ_ONCE(task->jobctl) & (JOBCTL_STOPPED | JOBCTL_TRACED)) != 0) | |
5eca1c10 | 145 | |
b5bf9a90 PZ |
146 | /* |
147 | * Special states are those that do not use the normal wait-loop pattern. See | |
148 | * the comment with set_special_state(). | |
149 | */ | |
150 | #define is_special_task_state(state) \ | |
1cef1150 | 151 | ((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD)) |
b5bf9a90 | 152 | |
85019c16 TG |
153 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
154 | # define debug_normal_state_change(state_value) \ | |
155 | do { \ | |
156 | WARN_ON_ONCE(is_special_task_state(state_value)); \ | |
157 | current->task_state_change = _THIS_IP_; \ | |
8eb23b9f PZ |
158 | } while (0) |
159 | ||
85019c16 | 160 | # define debug_special_state_change(state_value) \ |
b5bf9a90 | 161 | do { \ |
b5bf9a90 | 162 | WARN_ON_ONCE(!is_special_task_state(state_value)); \ |
b5bf9a90 | 163 | current->task_state_change = _THIS_IP_; \ |
b5bf9a90 | 164 | } while (0) |
85019c16 | 165 | |
5f220be2 TG |
166 | # define debug_rtlock_wait_set_state() \ |
167 | do { \ | |
168 | current->saved_state_change = current->task_state_change;\ | |
169 | current->task_state_change = _THIS_IP_; \ | |
170 | } while (0) | |
171 | ||
172 | # define debug_rtlock_wait_restore_state() \ | |
173 | do { \ | |
174 | current->task_state_change = current->saved_state_change;\ | |
175 | } while (0) | |
176 | ||
8eb23b9f | 177 | #else |
85019c16 TG |
178 | # define debug_normal_state_change(cond) do { } while (0) |
179 | # define debug_special_state_change(cond) do { } while (0) | |
5f220be2 TG |
180 | # define debug_rtlock_wait_set_state() do { } while (0) |
181 | # define debug_rtlock_wait_restore_state() do { } while (0) | |
85019c16 TG |
182 | #endif |
183 | ||
498d0c57 | 184 | /* |
48b55837 | 185 | * set_current_state() includes a barrier so that the write of current->__state |
498d0c57 AM |
186 | * is correctly serialised wrt the caller's subsequent test of whether to |
187 | * actually sleep: | |
188 | * | |
a2250238 | 189 | * for (;;) { |
498d0c57 | 190 | * set_current_state(TASK_UNINTERRUPTIBLE); |
58877d34 PZ |
191 | * if (CONDITION) |
192 | * break; | |
a2250238 PZ |
193 | * |
194 | * schedule(); | |
195 | * } | |
196 | * __set_current_state(TASK_RUNNING); | |
197 | * | |
198 | * If the caller does not need such serialisation (because, for instance, the | |
58877d34 | 199 | * CONDITION test and condition change and wakeup are under the same lock) then |
a2250238 PZ |
200 | * use __set_current_state(). |
201 | * | |
202 | * The above is typically ordered against the wakeup, which does: | |
203 | * | |
58877d34 | 204 | * CONDITION = 1; |
b5bf9a90 | 205 | * wake_up_state(p, TASK_UNINTERRUPTIBLE); |
a2250238 | 206 | * |
58877d34 | 207 | * where wake_up_state()/try_to_wake_up() executes a full memory barrier before |
48b55837 | 208 | * accessing p->__state. |
a2250238 | 209 | * |
48b55837 | 210 | * Wakeup will do: if (@state & p->__state) p->__state = TASK_RUNNING, that is, |
a2250238 PZ |
211 | * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a |
212 | * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING). | |
498d0c57 | 213 | * |
b5bf9a90 | 214 | * However, with slightly different timing the wakeup TASK_RUNNING store can |
dfcb245e | 215 | * also collide with the TASK_UNINTERRUPTIBLE store. Losing that store is not |
b5bf9a90 PZ |
216 | * a problem either because that will result in one extra go around the loop |
217 | * and our @cond test will save the day. | |
498d0c57 | 218 | * |
a2250238 | 219 | * Also see the comments of try_to_wake_up(). |
498d0c57 | 220 | */ |
b5bf9a90 | 221 | #define __set_current_state(state_value) \ |
85019c16 TG |
222 | do { \ |
223 | debug_normal_state_change((state_value)); \ | |
224 | WRITE_ONCE(current->__state, (state_value)); \ | |
225 | } while (0) | |
b5bf9a90 PZ |
226 | |
227 | #define set_current_state(state_value) \ | |
85019c16 TG |
228 | do { \ |
229 | debug_normal_state_change((state_value)); \ | |
230 | smp_store_mb(current->__state, (state_value)); \ | |
231 | } while (0) | |
b5bf9a90 PZ |
232 | |
233 | /* | |
234 | * set_special_state() should be used for those states when the blocking task | |
235 | * can not use the regular condition based wait-loop. In that case we must | |
85019c16 TG |
236 | * serialize against wakeups such that any possible in-flight TASK_RUNNING |
237 | * stores will not collide with our state change. | |
b5bf9a90 PZ |
238 | */ |
239 | #define set_special_state(state_value) \ | |
240 | do { \ | |
241 | unsigned long flags; /* may shadow */ \ | |
85019c16 | 242 | \ |
b5bf9a90 | 243 | raw_spin_lock_irqsave(¤t->pi_lock, flags); \ |
85019c16 | 244 | debug_special_state_change((state_value)); \ |
2f064a59 | 245 | WRITE_ONCE(current->__state, (state_value)); \ |
b5bf9a90 PZ |
246 | raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \ |
247 | } while (0) | |
248 | ||
5f220be2 TG |
249 | /* |
250 | * PREEMPT_RT specific variants for "sleeping" spin/rwlocks | |
251 | * | |
252 | * RT's spin/rwlock substitutions are state preserving. The state of the | |
253 | * task when blocking on the lock is saved in task_struct::saved_state and | |
254 | * restored after the lock has been acquired. These operations are | |
255 | * serialized by task_struct::pi_lock against try_to_wake_up(). Any non RT | |
256 | * lock related wakeups while the task is blocked on the lock are | |
257 | * redirected to operate on task_struct::saved_state to ensure that these | |
258 | * are not dropped. On restore task_struct::saved_state is set to | |
259 | * TASK_RUNNING so any wakeup attempt redirected to saved_state will fail. | |
260 | * | |
261 | * The lock operation looks like this: | |
262 | * | |
263 | * current_save_and_set_rtlock_wait_state(); | |
264 | * for (;;) { | |
265 | * if (try_lock()) | |
266 | * break; | |
267 | * raw_spin_unlock_irq(&lock->wait_lock); | |
268 | * schedule_rtlock(); | |
269 | * raw_spin_lock_irq(&lock->wait_lock); | |
270 | * set_current_state(TASK_RTLOCK_WAIT); | |
271 | * } | |
272 | * current_restore_rtlock_saved_state(); | |
273 | */ | |
274 | #define current_save_and_set_rtlock_wait_state() \ | |
275 | do { \ | |
276 | lockdep_assert_irqs_disabled(); \ | |
277 | raw_spin_lock(¤t->pi_lock); \ | |
278 | current->saved_state = current->__state; \ | |
279 | debug_rtlock_wait_set_state(); \ | |
280 | WRITE_ONCE(current->__state, TASK_RTLOCK_WAIT); \ | |
281 | raw_spin_unlock(¤t->pi_lock); \ | |
282 | } while (0); | |
283 | ||
284 | #define current_restore_rtlock_saved_state() \ | |
285 | do { \ | |
286 | lockdep_assert_irqs_disabled(); \ | |
287 | raw_spin_lock(¤t->pi_lock); \ | |
288 | debug_rtlock_wait_restore_state(); \ | |
289 | WRITE_ONCE(current->__state, current->saved_state); \ | |
290 | current->saved_state = TASK_RUNNING; \ | |
291 | raw_spin_unlock(¤t->pi_lock); \ | |
292 | } while (0); | |
8eb23b9f | 293 | |
2f064a59 | 294 | #define get_current_state() READ_ONCE(current->__state) |
d6c23bb3 | 295 | |
3087c61e YS |
296 | /* |
297 | * Define the task command name length as enum, then it can be visible to | |
298 | * BPF programs. | |
299 | */ | |
300 | enum { | |
301 | TASK_COMM_LEN = 16, | |
302 | }; | |
1da177e4 | 303 | |
1da177e4 LT |
304 | extern void scheduler_tick(void); |
305 | ||
5eca1c10 IM |
306 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
307 | ||
308 | extern long schedule_timeout(long timeout); | |
309 | extern long schedule_timeout_interruptible(long timeout); | |
310 | extern long schedule_timeout_killable(long timeout); | |
311 | extern long schedule_timeout_uninterruptible(long timeout); | |
312 | extern long schedule_timeout_idle(long timeout); | |
1da177e4 | 313 | asmlinkage void schedule(void); |
c5491ea7 | 314 | extern void schedule_preempt_disabled(void); |
19c95f26 | 315 | asmlinkage void preempt_schedule_irq(void); |
6991436c TG |
316 | #ifdef CONFIG_PREEMPT_RT |
317 | extern void schedule_rtlock(void); | |
318 | #endif | |
1da177e4 | 319 | |
10ab5643 TH |
320 | extern int __must_check io_schedule_prepare(void); |
321 | extern void io_schedule_finish(int token); | |
9cff8ade | 322 | extern long io_schedule_timeout(long timeout); |
10ab5643 | 323 | extern void io_schedule(void); |
9cff8ade | 324 | |
d37f761d | 325 | /** |
0ba42a59 | 326 | * struct prev_cputime - snapshot of system and user cputime |
d37f761d FW |
327 | * @utime: time spent in user mode |
328 | * @stime: time spent in system mode | |
9d7fb042 | 329 | * @lock: protects the above two fields |
d37f761d | 330 | * |
9d7fb042 PZ |
331 | * Stores previous user/system time values such that we can guarantee |
332 | * monotonicity. | |
d37f761d | 333 | */ |
9d7fb042 PZ |
334 | struct prev_cputime { |
335 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
5eca1c10 IM |
336 | u64 utime; |
337 | u64 stime; | |
338 | raw_spinlock_t lock; | |
9d7fb042 | 339 | #endif |
d37f761d FW |
340 | }; |
341 | ||
bac5b6b6 FW |
342 | enum vtime_state { |
343 | /* Task is sleeping or running in a CPU with VTIME inactive: */ | |
344 | VTIME_INACTIVE = 0, | |
14faf6fc FW |
345 | /* Task is idle */ |
346 | VTIME_IDLE, | |
bac5b6b6 FW |
347 | /* Task runs in kernelspace in a CPU with VTIME active: */ |
348 | VTIME_SYS, | |
14faf6fc FW |
349 | /* Task runs in userspace in a CPU with VTIME active: */ |
350 | VTIME_USER, | |
e6d5bf3e FW |
351 | /* Task runs as guests in a CPU with VTIME active: */ |
352 | VTIME_GUEST, | |
bac5b6b6 FW |
353 | }; |
354 | ||
355 | struct vtime { | |
356 | seqcount_t seqcount; | |
357 | unsigned long long starttime; | |
358 | enum vtime_state state; | |
802f4a82 | 359 | unsigned int cpu; |
2a42eb95 WL |
360 | u64 utime; |
361 | u64 stime; | |
362 | u64 gtime; | |
bac5b6b6 FW |
363 | }; |
364 | ||
69842cba PB |
365 | /* |
366 | * Utilization clamp constraints. | |
367 | * @UCLAMP_MIN: Minimum utilization | |
368 | * @UCLAMP_MAX: Maximum utilization | |
369 | * @UCLAMP_CNT: Utilization clamp constraints count | |
370 | */ | |
371 | enum uclamp_id { | |
372 | UCLAMP_MIN = 0, | |
373 | UCLAMP_MAX, | |
374 | UCLAMP_CNT | |
375 | }; | |
376 | ||
f9a25f77 MP |
377 | #ifdef CONFIG_SMP |
378 | extern struct root_domain def_root_domain; | |
379 | extern struct mutex sched_domains_mutex; | |
380 | #endif | |
381 | ||
d844fe65 KK |
382 | struct sched_param { |
383 | int sched_priority; | |
384 | }; | |
385 | ||
1da177e4 | 386 | struct sched_info { |
7f5f8e8d | 387 | #ifdef CONFIG_SCHED_INFO |
5eca1c10 IM |
388 | /* Cumulative counters: */ |
389 | ||
390 | /* # of times we have run on this CPU: */ | |
391 | unsigned long pcount; | |
392 | ||
393 | /* Time spent waiting on a runqueue: */ | |
394 | unsigned long long run_delay; | |
395 | ||
396 | /* Timestamps: */ | |
397 | ||
398 | /* When did we last run on a CPU? */ | |
399 | unsigned long long last_arrival; | |
400 | ||
401 | /* When were we last queued to run? */ | |
402 | unsigned long long last_queued; | |
1da177e4 | 403 | |
f6db8347 | 404 | #endif /* CONFIG_SCHED_INFO */ |
7f5f8e8d | 405 | }; |
1da177e4 | 406 | |
6ecdd749 YD |
407 | /* |
408 | * Integer metrics need fixed point arithmetic, e.g., sched/fair | |
409 | * has a few: load, load_avg, util_avg, freq, and capacity. | |
410 | * | |
411 | * We define a basic fixed point arithmetic range, and then formalize | |
412 | * all these metrics based on that basic range. | |
413 | */ | |
5eca1c10 IM |
414 | # define SCHED_FIXEDPOINT_SHIFT 10 |
415 | # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT) | |
6ecdd749 | 416 | |
69842cba PB |
417 | /* Increase resolution of cpu_capacity calculations */ |
418 | # define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT | |
419 | # define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT) | |
420 | ||
20b8a59f | 421 | struct load_weight { |
5eca1c10 IM |
422 | unsigned long weight; |
423 | u32 inv_weight; | |
20b8a59f IM |
424 | }; |
425 | ||
9d89c257 | 426 | /* |
9f683953 | 427 | * The load/runnable/util_avg accumulates an infinite geometric series |
0dacee1b | 428 | * (see __update_load_avg_cfs_rq() in kernel/sched/pelt.c). |
7b595334 YD |
429 | * |
430 | * [load_avg definition] | |
431 | * | |
432 | * load_avg = runnable% * scale_load_down(load) | |
433 | * | |
9f683953 VG |
434 | * [runnable_avg definition] |
435 | * | |
436 | * runnable_avg = runnable% * SCHED_CAPACITY_SCALE | |
7b595334 | 437 | * |
7b595334 YD |
438 | * [util_avg definition] |
439 | * | |
440 | * util_avg = running% * SCHED_CAPACITY_SCALE | |
441 | * | |
9f683953 VG |
442 | * where runnable% is the time ratio that a sched_entity is runnable and |
443 | * running% the time ratio that a sched_entity is running. | |
444 | * | |
445 | * For cfs_rq, they are the aggregated values of all runnable and blocked | |
446 | * sched_entities. | |
7b595334 | 447 | * |
c1b7b8d4 | 448 | * The load/runnable/util_avg doesn't directly factor frequency scaling and CPU |
9f683953 VG |
449 | * capacity scaling. The scaling is done through the rq_clock_pelt that is used |
450 | * for computing those signals (see update_rq_clock_pelt()) | |
7b595334 | 451 | * |
23127296 VG |
452 | * N.B., the above ratios (runnable% and running%) themselves are in the |
453 | * range of [0, 1]. To do fixed point arithmetics, we therefore scale them | |
454 | * to as large a range as necessary. This is for example reflected by | |
455 | * util_avg's SCHED_CAPACITY_SCALE. | |
7b595334 YD |
456 | * |
457 | * [Overflow issue] | |
458 | * | |
459 | * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities | |
460 | * with the highest load (=88761), always runnable on a single cfs_rq, | |
461 | * and should not overflow as the number already hits PID_MAX_LIMIT. | |
462 | * | |
463 | * For all other cases (including 32-bit kernels), struct load_weight's | |
464 | * weight will overflow first before we do, because: | |
465 | * | |
466 | * Max(load_avg) <= Max(load.weight) | |
467 | * | |
468 | * Then it is the load_weight's responsibility to consider overflow | |
469 | * issues. | |
9d89c257 | 470 | */ |
9d85f21c | 471 | struct sched_avg { |
5eca1c10 IM |
472 | u64 last_update_time; |
473 | u64 load_sum; | |
9f683953 | 474 | u64 runnable_sum; |
5eca1c10 IM |
475 | u32 util_sum; |
476 | u32 period_contrib; | |
477 | unsigned long load_avg; | |
9f683953 | 478 | unsigned long runnable_avg; |
5eca1c10 | 479 | unsigned long util_avg; |
11137d38 | 480 | unsigned int util_est; |
317d359d | 481 | } ____cacheline_aligned; |
9d85f21c | 482 | |
11137d38 VG |
483 | /* |
484 | * The UTIL_AVG_UNCHANGED flag is used to synchronize util_est with util_avg | |
485 | * updates. When a task is dequeued, its util_est should not be updated if its | |
486 | * util_avg has not been updated in the meantime. | |
487 | * This information is mapped into the MSB bit of util_est at dequeue time. | |
488 | * Since max value of util_est for a task is 1024 (PELT util_avg for a task) | |
489 | * it is safe to use MSB. | |
490 | */ | |
491 | #define UTIL_EST_WEIGHT_SHIFT 2 | |
492 | #define UTIL_AVG_UNCHANGED 0x80000000 | |
493 | ||
41acab88 | 494 | struct sched_statistics { |
7f5f8e8d | 495 | #ifdef CONFIG_SCHEDSTATS |
5eca1c10 IM |
496 | u64 wait_start; |
497 | u64 wait_max; | |
498 | u64 wait_count; | |
499 | u64 wait_sum; | |
500 | u64 iowait_count; | |
501 | u64 iowait_sum; | |
502 | ||
503 | u64 sleep_start; | |
504 | u64 sleep_max; | |
505 | s64 sum_sleep_runtime; | |
506 | ||
507 | u64 block_start; | |
508 | u64 block_max; | |
847fc0cd YS |
509 | s64 sum_block_runtime; |
510 | ||
5d69eca5 | 511 | s64 exec_max; |
5eca1c10 IM |
512 | u64 slice_max; |
513 | ||
514 | u64 nr_migrations_cold; | |
515 | u64 nr_failed_migrations_affine; | |
516 | u64 nr_failed_migrations_running; | |
517 | u64 nr_failed_migrations_hot; | |
518 | u64 nr_forced_migrations; | |
519 | ||
520 | u64 nr_wakeups; | |
521 | u64 nr_wakeups_sync; | |
522 | u64 nr_wakeups_migrate; | |
523 | u64 nr_wakeups_local; | |
524 | u64 nr_wakeups_remote; | |
525 | u64 nr_wakeups_affine; | |
526 | u64 nr_wakeups_affine_attempts; | |
527 | u64 nr_wakeups_passive; | |
528 | u64 nr_wakeups_idle; | |
4feee7d1 JD |
529 | |
530 | #ifdef CONFIG_SCHED_CORE | |
531 | u64 core_forceidle_sum; | |
41acab88 | 532 | #endif |
4feee7d1 | 533 | #endif /* CONFIG_SCHEDSTATS */ |
ceeadb83 | 534 | } ____cacheline_aligned; |
41acab88 LDM |
535 | |
536 | struct sched_entity { | |
5eca1c10 IM |
537 | /* For load-balancing: */ |
538 | struct load_weight load; | |
539 | struct rb_node run_node; | |
147f3efa | 540 | u64 deadline; |
2227a957 | 541 | u64 min_vruntime; |
147f3efa | 542 | |
5eca1c10 IM |
543 | struct list_head group_node; |
544 | unsigned int on_rq; | |
41acab88 | 545 | |
5eca1c10 IM |
546 | u64 exec_start; |
547 | u64 sum_exec_runtime; | |
5eca1c10 | 548 | u64 prev_sum_exec_runtime; |
86bfbb7c PZ |
549 | u64 vruntime; |
550 | s64 vlag; | |
147f3efa | 551 | u64 slice; |
41acab88 | 552 | |
5eca1c10 | 553 | u64 nr_migrations; |
41acab88 | 554 | |
20b8a59f | 555 | #ifdef CONFIG_FAIR_GROUP_SCHED |
5eca1c10 IM |
556 | int depth; |
557 | struct sched_entity *parent; | |
20b8a59f | 558 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 559 | struct cfs_rq *cfs_rq; |
20b8a59f | 560 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 561 | struct cfs_rq *my_q; |
9f683953 VG |
562 | /* cached value of my_q->h_nr_running */ |
563 | unsigned long runnable_weight; | |
20b8a59f | 564 | #endif |
8bd75c77 | 565 | |
141965c7 | 566 | #ifdef CONFIG_SMP |
5a107804 JO |
567 | /* |
568 | * Per entity load average tracking. | |
569 | * | |
570 | * Put into separate cache line so it does not | |
571 | * collide with read-mostly values above. | |
572 | */ | |
317d359d | 573 | struct sched_avg avg; |
9d85f21c | 574 | #endif |
20b8a59f | 575 | }; |
70b97a7f | 576 | |
fa717060 | 577 | struct sched_rt_entity { |
5eca1c10 IM |
578 | struct list_head run_list; |
579 | unsigned long timeout; | |
580 | unsigned long watchdog_stamp; | |
581 | unsigned int time_slice; | |
582 | unsigned short on_rq; | |
583 | unsigned short on_list; | |
584 | ||
585 | struct sched_rt_entity *back; | |
052f1dc7 | 586 | #ifdef CONFIG_RT_GROUP_SCHED |
5eca1c10 | 587 | struct sched_rt_entity *parent; |
6f505b16 | 588 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 589 | struct rt_rq *rt_rq; |
6f505b16 | 590 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 591 | struct rt_rq *my_q; |
6f505b16 | 592 | #endif |
3859a271 | 593 | } __randomize_layout; |
fa717060 | 594 | |
63ba8422 PZ |
595 | typedef bool (*dl_server_has_tasks_f)(struct sched_dl_entity *); |
596 | typedef struct task_struct *(*dl_server_pick_f)(struct sched_dl_entity *); | |
597 | ||
aab03e05 | 598 | struct sched_dl_entity { |
5eca1c10 | 599 | struct rb_node rb_node; |
aab03e05 DF |
600 | |
601 | /* | |
602 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 603 | * during sched_setattr(), they will remain the same until |
604 | * the next sched_setattr(). | |
aab03e05 | 605 | */ |
5eca1c10 IM |
606 | u64 dl_runtime; /* Maximum runtime for each instance */ |
607 | u64 dl_deadline; /* Relative deadline of each instance */ | |
608 | u64 dl_period; /* Separation of two instances (period) */ | |
54d6d303 | 609 | u64 dl_bw; /* dl_runtime / dl_period */ |
3effcb42 | 610 | u64 dl_density; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
611 | |
612 | /* | |
613 | * Actual scheduling parameters. Initialized with the values above, | |
dfcb245e | 614 | * they are continuously updated during task execution. Note that |
aab03e05 DF |
615 | * the remaining runtime could be < 0 in case we are in overrun. |
616 | */ | |
5eca1c10 IM |
617 | s64 runtime; /* Remaining runtime for this instance */ |
618 | u64 deadline; /* Absolute deadline for this instance */ | |
619 | unsigned int flags; /* Specifying the scheduler behaviour */ | |
aab03e05 DF |
620 | |
621 | /* | |
622 | * Some bool flags: | |
623 | * | |
624 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
625 | * task has to wait for a replenishment to be performed at the | |
626 | * next firing of dl_timer. | |
627 | * | |
5eca1c10 | 628 | * @dl_yielded tells if task gave up the CPU before consuming |
5bfd126e | 629 | * all its available runtime during the last job. |
209a0cbd LA |
630 | * |
631 | * @dl_non_contending tells if the task is inactive while still | |
632 | * contributing to the active utilization. In other words, it | |
633 | * indicates if the inactive timer has been armed and its handler | |
634 | * has not been executed yet. This flag is useful to avoid race | |
635 | * conditions between the inactive timer handler and the wakeup | |
636 | * code. | |
34be3930 JL |
637 | * |
638 | * @dl_overrun tells if the task asked to be informed about runtime | |
639 | * overruns. | |
aab03e05 | 640 | */ |
aa5222e9 | 641 | unsigned int dl_throttled : 1; |
aa5222e9 DC |
642 | unsigned int dl_yielded : 1; |
643 | unsigned int dl_non_contending : 1; | |
34be3930 | 644 | unsigned int dl_overrun : 1; |
63ba8422 | 645 | unsigned int dl_server : 1; |
aab03e05 DF |
646 | |
647 | /* | |
648 | * Bandwidth enforcement timer. Each -deadline task has its | |
649 | * own bandwidth to be enforced, thus we need one timer per task. | |
650 | */ | |
5eca1c10 | 651 | struct hrtimer dl_timer; |
209a0cbd LA |
652 | |
653 | /* | |
654 | * Inactive timer, responsible for decreasing the active utilization | |
655 | * at the "0-lag time". When a -deadline task blocks, it contributes | |
656 | * to GRUB's active utilization until the "0-lag time", hence a | |
657 | * timer is needed to decrease the active utilization at the correct | |
658 | * time. | |
659 | */ | |
63ba8422 PZ |
660 | struct hrtimer inactive_timer; |
661 | ||
662 | /* | |
663 | * Bits for DL-server functionality. Also see the comment near | |
664 | * dl_server_update(). | |
665 | * | |
666 | * @rq the runqueue this server is for | |
667 | * | |
668 | * @server_has_tasks() returns true if @server_pick return a | |
669 | * runnable task. | |
670 | */ | |
671 | struct rq *rq; | |
672 | dl_server_has_tasks_f server_has_tasks; | |
673 | dl_server_pick_f server_pick; | |
2279f540 JL |
674 | |
675 | #ifdef CONFIG_RT_MUTEXES | |
676 | /* | |
677 | * Priority Inheritance. When a DEADLINE scheduling entity is boosted | |
678 | * pi_se points to the donor, otherwise points to the dl_se it belongs | |
679 | * to (the original one/itself). | |
680 | */ | |
681 | struct sched_dl_entity *pi_se; | |
682 | #endif | |
aab03e05 | 683 | }; |
8bd75c77 | 684 | |
69842cba PB |
685 | #ifdef CONFIG_UCLAMP_TASK |
686 | /* Number of utilization clamp buckets (shorter alias) */ | |
687 | #define UCLAMP_BUCKETS CONFIG_UCLAMP_BUCKETS_COUNT | |
688 | ||
689 | /* | |
690 | * Utilization clamp for a scheduling entity | |
691 | * @value: clamp value "assigned" to a se | |
692 | * @bucket_id: bucket index corresponding to the "assigned" value | |
e8f14172 | 693 | * @active: the se is currently refcounted in a rq's bucket |
a509a7cd | 694 | * @user_defined: the requested clamp value comes from user-space |
69842cba PB |
695 | * |
696 | * The bucket_id is the index of the clamp bucket matching the clamp value | |
697 | * which is pre-computed and stored to avoid expensive integer divisions from | |
698 | * the fast path. | |
e8f14172 PB |
699 | * |
700 | * The active bit is set whenever a task has got an "effective" value assigned, | |
701 | * which can be different from the clamp value "requested" from user-space. | |
702 | * This allows to know a task is refcounted in the rq's bucket corresponding | |
703 | * to the "effective" bucket_id. | |
a509a7cd PB |
704 | * |
705 | * The user_defined bit is set whenever a task has got a task-specific clamp | |
706 | * value requested from userspace, i.e. the system defaults apply to this task | |
707 | * just as a restriction. This allows to relax default clamps when a less | |
708 | * restrictive task-specific value has been requested, thus allowing to | |
709 | * implement a "nice" semantic. For example, a task running with a 20% | |
710 | * default boost can still drop its own boosting to 0%. | |
69842cba PB |
711 | */ |
712 | struct uclamp_se { | |
713 | unsigned int value : bits_per(SCHED_CAPACITY_SCALE); | |
714 | unsigned int bucket_id : bits_per(UCLAMP_BUCKETS); | |
e8f14172 | 715 | unsigned int active : 1; |
a509a7cd | 716 | unsigned int user_defined : 1; |
69842cba PB |
717 | }; |
718 | #endif /* CONFIG_UCLAMP_TASK */ | |
719 | ||
1d082fd0 PM |
720 | union rcu_special { |
721 | struct { | |
5eca1c10 IM |
722 | u8 blocked; |
723 | u8 need_qs; | |
05f41571 | 724 | u8 exp_hint; /* Hint for performance. */ |
276c4104 | 725 | u8 need_mb; /* Readers need smp_mb(). */ |
8203d6d0 | 726 | } b; /* Bits. */ |
05f41571 | 727 | u32 s; /* Set of bits. */ |
1d082fd0 | 728 | }; |
86848966 | 729 | |
8dc85d54 PZ |
730 | enum perf_event_task_context { |
731 | perf_invalid_context = -1, | |
732 | perf_hw_context = 0, | |
89a1e187 | 733 | perf_sw_context, |
8dc85d54 PZ |
734 | perf_nr_task_contexts, |
735 | }; | |
736 | ||
eb61baf6 IM |
737 | struct wake_q_node { |
738 | struct wake_q_node *next; | |
739 | }; | |
740 | ||
5fbda3ec TG |
741 | struct kmap_ctrl { |
742 | #ifdef CONFIG_KMAP_LOCAL | |
743 | int idx; | |
744 | pte_t pteval[KM_MAX_IDX]; | |
745 | #endif | |
746 | }; | |
747 | ||
1da177e4 | 748 | struct task_struct { |
c65eacbe AL |
749 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
750 | /* | |
751 | * For reasons of header soup (see current_thread_info()), this | |
752 | * must be the first element of task_struct. | |
753 | */ | |
5eca1c10 | 754 | struct thread_info thread_info; |
c65eacbe | 755 | #endif |
2f064a59 | 756 | unsigned int __state; |
29e48ce8 | 757 | |
5f220be2 TG |
758 | /* saved state for "spinlock sleepers" */ |
759 | unsigned int saved_state; | |
5f220be2 | 760 | |
29e48ce8 KC |
761 | /* |
762 | * This begins the randomizable portion of task_struct. Only | |
763 | * scheduling-critical items should be added above here. | |
764 | */ | |
765 | randomized_struct_fields_start | |
766 | ||
5eca1c10 | 767 | void *stack; |
ec1d2819 | 768 | refcount_t usage; |
5eca1c10 IM |
769 | /* Per task flags (PF_*), defined further below: */ |
770 | unsigned int flags; | |
771 | unsigned int ptrace; | |
1da177e4 | 772 | |
2dd73a4f | 773 | #ifdef CONFIG_SMP |
5eca1c10 | 774 | int on_cpu; |
8c4890d1 | 775 | struct __call_single_node wake_entry; |
5eca1c10 IM |
776 | unsigned int wakee_flips; |
777 | unsigned long wakee_flip_decay_ts; | |
778 | struct task_struct *last_wakee; | |
ac66f547 | 779 | |
32e839dd MG |
780 | /* |
781 | * recent_used_cpu is initially set as the last CPU used by a task | |
782 | * that wakes affine another task. Waker/wakee relationships can | |
783 | * push tasks around a CPU where each wakeup moves to the next one. | |
784 | * Tracking a recently used CPU allows a quick search for a recently | |
785 | * used CPU that may be idle. | |
786 | */ | |
787 | int recent_used_cpu; | |
5eca1c10 | 788 | int wake_cpu; |
2dd73a4f | 789 | #endif |
5eca1c10 IM |
790 | int on_rq; |
791 | ||
792 | int prio; | |
793 | int static_prio; | |
794 | int normal_prio; | |
795 | unsigned int rt_priority; | |
50e645a8 | 796 | |
5eca1c10 IM |
797 | struct sched_entity se; |
798 | struct sched_rt_entity rt; | |
8a311c74 | 799 | struct sched_dl_entity dl; |
63ba8422 | 800 | struct sched_dl_entity *dl_server; |
804bccba | 801 | const struct sched_class *sched_class; |
8a311c74 PZ |
802 | |
803 | #ifdef CONFIG_SCHED_CORE | |
804 | struct rb_node core_node; | |
805 | unsigned long core_cookie; | |
d2dfa17b | 806 | unsigned int core_occupation; |
8a311c74 PZ |
807 | #endif |
808 | ||
8323f26c | 809 | #ifdef CONFIG_CGROUP_SCHED |
5eca1c10 | 810 | struct task_group *sched_task_group; |
8323f26c | 811 | #endif |
1da177e4 | 812 | |
69842cba | 813 | #ifdef CONFIG_UCLAMP_TASK |
13685c4a QY |
814 | /* |
815 | * Clamp values requested for a scheduling entity. | |
816 | * Must be updated with task_rq_lock() held. | |
817 | */ | |
e8f14172 | 818 | struct uclamp_se uclamp_req[UCLAMP_CNT]; |
13685c4a QY |
819 | /* |
820 | * Effective clamp values used for a scheduling entity. | |
821 | * Must be updated with task_rq_lock() held. | |
822 | */ | |
69842cba PB |
823 | struct uclamp_se uclamp[UCLAMP_CNT]; |
824 | #endif | |
825 | ||
ceeadb83 YS |
826 | struct sched_statistics stats; |
827 | ||
e107be36 | 828 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
5eca1c10 IM |
829 | /* List of struct preempt_notifier: */ |
830 | struct hlist_head preempt_notifiers; | |
e107be36 AK |
831 | #endif |
832 | ||
6c5c9341 | 833 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
5eca1c10 | 834 | unsigned int btrace_seq; |
6c5c9341 | 835 | #endif |
1da177e4 | 836 | |
5eca1c10 IM |
837 | unsigned int policy; |
838 | int nr_cpus_allowed; | |
3bd37062 | 839 | const cpumask_t *cpus_ptr; |
b90ca8ba | 840 | cpumask_t *user_cpus_ptr; |
3bd37062 | 841 | cpumask_t cpus_mask; |
6d337eab | 842 | void *migration_pending; |
74d862b6 | 843 | #ifdef CONFIG_SMP |
a7c81556 | 844 | unsigned short migration_disabled; |
af449901 | 845 | #endif |
a7c81556 | 846 | unsigned short migration_flags; |
1da177e4 | 847 | |
a57eb940 | 848 | #ifdef CONFIG_PREEMPT_RCU |
5eca1c10 IM |
849 | int rcu_read_lock_nesting; |
850 | union rcu_special rcu_read_unlock_special; | |
851 | struct list_head rcu_node_entry; | |
852 | struct rcu_node *rcu_blocked_node; | |
28f6569a | 853 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
5eca1c10 | 854 | |
8315f422 | 855 | #ifdef CONFIG_TASKS_RCU |
5eca1c10 | 856 | unsigned long rcu_tasks_nvcsw; |
ccdd29ff PM |
857 | u8 rcu_tasks_holdout; |
858 | u8 rcu_tasks_idx; | |
5eca1c10 | 859 | int rcu_tasks_idle_cpu; |
ccdd29ff | 860 | struct list_head rcu_tasks_holdout_list; |
8315f422 | 861 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
e260be67 | 862 | |
d5f177d3 PM |
863 | #ifdef CONFIG_TASKS_TRACE_RCU |
864 | int trc_reader_nesting; | |
865 | int trc_ipi_to_cpu; | |
276c4104 | 866 | union rcu_special trc_reader_special; |
d5f177d3 | 867 | struct list_head trc_holdout_list; |
434c9eef PM |
868 | struct list_head trc_blkd_node; |
869 | int trc_blkd_cpu; | |
d5f177d3 PM |
870 | #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */ |
871 | ||
5eca1c10 | 872 | struct sched_info sched_info; |
1da177e4 | 873 | |
5eca1c10 | 874 | struct list_head tasks; |
806c09a7 | 875 | #ifdef CONFIG_SMP |
5eca1c10 IM |
876 | struct plist_node pushable_tasks; |
877 | struct rb_node pushable_dl_tasks; | |
806c09a7 | 878 | #endif |
1da177e4 | 879 | |
5eca1c10 IM |
880 | struct mm_struct *mm; |
881 | struct mm_struct *active_mm; | |
2b69987b | 882 | struct address_space *faults_disabled_mapping; |
314ff785 | 883 | |
5eca1c10 IM |
884 | int exit_state; |
885 | int exit_code; | |
886 | int exit_signal; | |
887 | /* The signal sent when the parent dies: */ | |
888 | int pdeath_signal; | |
889 | /* JOBCTL_*, siglock protected: */ | |
890 | unsigned long jobctl; | |
891 | ||
892 | /* Used for emulating ABI behavior of previous Linux versions: */ | |
893 | unsigned int personality; | |
894 | ||
895 | /* Scheduler bits, serialized by scheduler locks: */ | |
896 | unsigned sched_reset_on_fork:1; | |
897 | unsigned sched_contributes_to_load:1; | |
898 | unsigned sched_migrated:1; | |
eb414681 | 899 | |
5eca1c10 IM |
900 | /* Force alignment to the next boundary: */ |
901 | unsigned :0; | |
902 | ||
903 | /* Unserialized, strictly 'current' */ | |
904 | ||
f97bb527 PZ |
905 | /* |
906 | * This field must not be in the scheduler word above due to wakelist | |
907 | * queueing no longer being serialized by p->on_cpu. However: | |
908 | * | |
909 | * p->XXX = X; ttwu() | |
910 | * schedule() if (p->on_rq && ..) // false | |
911 | * smp_mb__after_spinlock(); if (smp_load_acquire(&p->on_cpu) && //true | |
912 | * deactivate_task() ttwu_queue_wakelist()) | |
913 | * p->on_rq = 0; p->sched_remote_wakeup = Y; | |
914 | * | |
915 | * guarantees all stores of 'current' are visible before | |
916 | * ->sched_remote_wakeup gets used, so it can be in this word. | |
917 | */ | |
918 | unsigned sched_remote_wakeup:1; | |
6b596e62 PZ |
919 | #ifdef CONFIG_RT_MUTEXES |
920 | unsigned sched_rt_mutex:1; | |
921 | #endif | |
f97bb527 | 922 | |
5eca1c10 IM |
923 | /* Bit to tell LSMs we're in execve(): */ |
924 | unsigned in_execve:1; | |
925 | unsigned in_iowait:1; | |
926 | #ifndef TIF_RESTORE_SIGMASK | |
927 | unsigned restore_sigmask:1; | |
7e781418 | 928 | #endif |
626ebc41 | 929 | #ifdef CONFIG_MEMCG |
29ef680a | 930 | unsigned in_user_fault:1; |
127424c8 | 931 | #endif |
ec1c86b2 YZ |
932 | #ifdef CONFIG_LRU_GEN |
933 | /* whether the LRU algorithm may apply to this access */ | |
934 | unsigned in_lru_fault:1; | |
935 | #endif | |
ff303e66 | 936 | #ifdef CONFIG_COMPAT_BRK |
5eca1c10 | 937 | unsigned brk_randomized:1; |
ff303e66 | 938 | #endif |
77f88796 TH |
939 | #ifdef CONFIG_CGROUPS |
940 | /* disallow userland-initiated cgroup migration */ | |
941 | unsigned no_cgroup_migration:1; | |
76f969e8 RG |
942 | /* task is frozen/stopped (used by the cgroup freezer) */ |
943 | unsigned frozen:1; | |
77f88796 | 944 | #endif |
d09d8df3 | 945 | #ifdef CONFIG_BLK_CGROUP |
d09d8df3 JB |
946 | unsigned use_memdelay:1; |
947 | #endif | |
1066d1b6 YS |
948 | #ifdef CONFIG_PSI |
949 | /* Stalled due to lack of memory */ | |
950 | unsigned in_memstall:1; | |
951 | #endif | |
8e9b16c4 ST |
952 | #ifdef CONFIG_PAGE_OWNER |
953 | /* Used by page_owner=on to detect recursion in page tracking. */ | |
954 | unsigned in_page_owner:1; | |
955 | #endif | |
b542e383 TG |
956 | #ifdef CONFIG_EVENTFD |
957 | /* Recursion prevention for eventfd_signal() */ | |
9f0deaa1 | 958 | unsigned in_eventfd:1; |
b542e383 | 959 | #endif |
8f23f5db | 960 | #ifdef CONFIG_ARCH_HAS_CPU_PASID |
a3d29e82 PZ |
961 | unsigned pasid_activated:1; |
962 | #endif | |
b041b525 TL |
963 | #ifdef CONFIG_CPU_SUP_INTEL |
964 | unsigned reported_split_lock:1; | |
965 | #endif | |
aa1cf99b YY |
966 | #ifdef CONFIG_TASK_DELAY_ACCT |
967 | /* delay due to memory thrashing */ | |
968 | unsigned in_thrashing:1; | |
969 | #endif | |
6f185c29 | 970 | |
5eca1c10 | 971 | unsigned long atomic_flags; /* Flags requiring atomic access. */ |
1d4457f9 | 972 | |
5eca1c10 | 973 | struct restart_block restart_block; |
f56141e3 | 974 | |
5eca1c10 IM |
975 | pid_t pid; |
976 | pid_t tgid; | |
0a425405 | 977 | |
050e9baa | 978 | #ifdef CONFIG_STACKPROTECTOR |
5eca1c10 IM |
979 | /* Canary value for the -fstack-protector GCC feature: */ |
980 | unsigned long stack_canary; | |
1314562a | 981 | #endif |
4d1d61a6 | 982 | /* |
5eca1c10 | 983 | * Pointers to the (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 984 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 985 | * p->real_parent->pid) |
1da177e4 | 986 | */ |
5eca1c10 IM |
987 | |
988 | /* Real parent process: */ | |
989 | struct task_struct __rcu *real_parent; | |
990 | ||
991 | /* Recipient of SIGCHLD, wait4() reports: */ | |
992 | struct task_struct __rcu *parent; | |
993 | ||
1da177e4 | 994 | /* |
5eca1c10 | 995 | * Children/sibling form the list of natural children: |
1da177e4 | 996 | */ |
5eca1c10 IM |
997 | struct list_head children; |
998 | struct list_head sibling; | |
999 | struct task_struct *group_leader; | |
1da177e4 | 1000 | |
f470021a | 1001 | /* |
5eca1c10 IM |
1002 | * 'ptraced' is the list of tasks this task is using ptrace() on. |
1003 | * | |
f470021a | 1004 | * This includes both natural children and PTRACE_ATTACH targets. |
5eca1c10 | 1005 | * 'ptrace_entry' is this task's link on the p->parent->ptraced list. |
f470021a | 1006 | */ |
5eca1c10 IM |
1007 | struct list_head ptraced; |
1008 | struct list_head ptrace_entry; | |
f470021a | 1009 | |
1da177e4 | 1010 | /* PID/PID hash table linkage. */ |
2c470475 EB |
1011 | struct pid *thread_pid; |
1012 | struct hlist_node pid_links[PIDTYPE_MAX]; | |
5eca1c10 IM |
1013 | struct list_head thread_node; |
1014 | ||
1015 | struct completion *vfork_done; | |
1da177e4 | 1016 | |
5eca1c10 IM |
1017 | /* CLONE_CHILD_SETTID: */ |
1018 | int __user *set_child_tid; | |
1da177e4 | 1019 | |
5eca1c10 IM |
1020 | /* CLONE_CHILD_CLEARTID: */ |
1021 | int __user *clear_child_tid; | |
1022 | ||
e32cf5df EB |
1023 | /* PF_KTHREAD | PF_IO_WORKER */ |
1024 | void *worker_private; | |
3bfe6106 | 1025 | |
5eca1c10 IM |
1026 | u64 utime; |
1027 | u64 stime; | |
40565b5a | 1028 | #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME |
5eca1c10 IM |
1029 | u64 utimescaled; |
1030 | u64 stimescaled; | |
40565b5a | 1031 | #endif |
5eca1c10 IM |
1032 | u64 gtime; |
1033 | struct prev_cputime prev_cputime; | |
6a61671b | 1034 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
bac5b6b6 | 1035 | struct vtime vtime; |
d99ca3b9 | 1036 | #endif |
d027d45d FW |
1037 | |
1038 | #ifdef CONFIG_NO_HZ_FULL | |
5eca1c10 | 1039 | atomic_t tick_dep_mask; |
d027d45d | 1040 | #endif |
5eca1c10 IM |
1041 | /* Context switch counts: */ |
1042 | unsigned long nvcsw; | |
1043 | unsigned long nivcsw; | |
1044 | ||
1045 | /* Monotonic time in nsecs: */ | |
1046 | u64 start_time; | |
1047 | ||
1048 | /* Boot based time in nsecs: */ | |
cf25e24d | 1049 | u64 start_boottime; |
5eca1c10 IM |
1050 | |
1051 | /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */ | |
1052 | unsigned long min_flt; | |
1053 | unsigned long maj_flt; | |
1da177e4 | 1054 | |
2b69942f TG |
1055 | /* Empty if CONFIG_POSIX_CPUTIMERS=n */ |
1056 | struct posix_cputimers posix_cputimers; | |
1da177e4 | 1057 | |
1fb497dd TG |
1058 | #ifdef CONFIG_POSIX_CPU_TIMERS_TASK_WORK |
1059 | struct posix_cputimers_work posix_cputimers_work; | |
1060 | #endif | |
1061 | ||
5eca1c10 IM |
1062 | /* Process credentials: */ |
1063 | ||
1064 | /* Tracer's credentials at attach: */ | |
1065 | const struct cred __rcu *ptracer_cred; | |
1066 | ||
1067 | /* Objective and real subjective task credentials (COW): */ | |
1068 | const struct cred __rcu *real_cred; | |
1069 | ||
1070 | /* Effective (overridable) subjective task credentials (COW): */ | |
1071 | const struct cred __rcu *cred; | |
1072 | ||
7743c48e DH |
1073 | #ifdef CONFIG_KEYS |
1074 | /* Cached requested key. */ | |
1075 | struct key *cached_requested_key; | |
1076 | #endif | |
1077 | ||
5eca1c10 IM |
1078 | /* |
1079 | * executable name, excluding path. | |
1080 | * | |
1081 | * - normally initialized setup_new_exec() | |
1082 | * - access it with [gs]et_task_comm() | |
1083 | * - lock it with task_lock() | |
1084 | */ | |
1085 | char comm[TASK_COMM_LEN]; | |
1086 | ||
1087 | struct nameidata *nameidata; | |
1088 | ||
3d5b6fcc | 1089 | #ifdef CONFIG_SYSVIPC |
5eca1c10 IM |
1090 | struct sysv_sem sysvsem; |
1091 | struct sysv_shm sysvshm; | |
3d5b6fcc | 1092 | #endif |
e162b39a | 1093 | #ifdef CONFIG_DETECT_HUNG_TASK |
5eca1c10 | 1094 | unsigned long last_switch_count; |
a2e51445 | 1095 | unsigned long last_switch_time; |
82a1fcb9 | 1096 | #endif |
5eca1c10 IM |
1097 | /* Filesystem information: */ |
1098 | struct fs_struct *fs; | |
1099 | ||
1100 | /* Open file information: */ | |
1101 | struct files_struct *files; | |
1102 | ||
0f212204 JA |
1103 | #ifdef CONFIG_IO_URING |
1104 | struct io_uring_task *io_uring; | |
1105 | #endif | |
1106 | ||
5eca1c10 IM |
1107 | /* Namespaces: */ |
1108 | struct nsproxy *nsproxy; | |
1109 | ||
1110 | /* Signal handlers: */ | |
1111 | struct signal_struct *signal; | |
913292c9 | 1112 | struct sighand_struct __rcu *sighand; |
5eca1c10 IM |
1113 | sigset_t blocked; |
1114 | sigset_t real_blocked; | |
1115 | /* Restored if set_restore_sigmask() was used: */ | |
1116 | sigset_t saved_sigmask; | |
1117 | struct sigpending pending; | |
1118 | unsigned long sas_ss_sp; | |
1119 | size_t sas_ss_size; | |
1120 | unsigned int sas_ss_flags; | |
1121 | ||
1122 | struct callback_head *task_works; | |
1123 | ||
4b7d248b | 1124 | #ifdef CONFIG_AUDIT |
bfef93a5 | 1125 | #ifdef CONFIG_AUDITSYSCALL |
5f3d544f RGB |
1126 | struct audit_context *audit_context; |
1127 | #endif | |
5eca1c10 IM |
1128 | kuid_t loginuid; |
1129 | unsigned int sessionid; | |
bfef93a5 | 1130 | #endif |
5eca1c10 | 1131 | struct seccomp seccomp; |
1446e1df | 1132 | struct syscall_user_dispatch syscall_dispatch; |
5eca1c10 IM |
1133 | |
1134 | /* Thread group tracking: */ | |
d1e7fd64 EB |
1135 | u64 parent_exec_id; |
1136 | u64 self_exec_id; | |
1da177e4 | 1137 | |
5eca1c10 IM |
1138 | /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */ |
1139 | spinlock_t alloc_lock; | |
1da177e4 | 1140 | |
b29739f9 | 1141 | /* Protection of the PI data structures: */ |
5eca1c10 | 1142 | raw_spinlock_t pi_lock; |
b29739f9 | 1143 | |
5eca1c10 | 1144 | struct wake_q_node wake_q; |
76751049 | 1145 | |
23f78d4a | 1146 | #ifdef CONFIG_RT_MUTEXES |
5eca1c10 | 1147 | /* PI waiters blocked on a rt_mutex held by this task: */ |
a23ba907 | 1148 | struct rb_root_cached pi_waiters; |
e96a7705 XP |
1149 | /* Updated under owner's pi_lock and rq lock */ |
1150 | struct task_struct *pi_top_task; | |
5eca1c10 IM |
1151 | /* Deadlock detection and priority inheritance handling: */ |
1152 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1153 | #endif |
1154 | ||
408894ee | 1155 | #ifdef CONFIG_DEBUG_MUTEXES |
5eca1c10 IM |
1156 | /* Mutex deadlock detection: */ |
1157 | struct mutex_waiter *blocked_on; | |
408894ee | 1158 | #endif |
5eca1c10 | 1159 | |
312364f3 DV |
1160 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
1161 | int non_block_count; | |
1162 | #endif | |
1163 | ||
de30a2b3 | 1164 | #ifdef CONFIG_TRACE_IRQFLAGS |
0584df9c | 1165 | struct irqtrace_events irqtrace; |
de8f5e4f | 1166 | unsigned int hardirq_threaded; |
c86e9b98 | 1167 | u64 hardirq_chain_key; |
5eca1c10 IM |
1168 | int softirqs_enabled; |
1169 | int softirq_context; | |
40db1739 | 1170 | int irq_config; |
de30a2b3 | 1171 | #endif |
728b478d TG |
1172 | #ifdef CONFIG_PREEMPT_RT |
1173 | int softirq_disable_cnt; | |
1174 | #endif | |
5eca1c10 | 1175 | |
fbb9ce95 | 1176 | #ifdef CONFIG_LOCKDEP |
5eca1c10 IM |
1177 | # define MAX_LOCK_DEPTH 48UL |
1178 | u64 curr_chain_key; | |
1179 | int lockdep_depth; | |
1180 | unsigned int lockdep_recursion; | |
1181 | struct held_lock held_locks[MAX_LOCK_DEPTH]; | |
fbb9ce95 | 1182 | #endif |
5eca1c10 | 1183 | |
5cf53f3c | 1184 | #if defined(CONFIG_UBSAN) && !defined(CONFIG_UBSAN_TRAP) |
5eca1c10 | 1185 | unsigned int in_ubsan; |
c6d30853 | 1186 | #endif |
408894ee | 1187 | |
5eca1c10 IM |
1188 | /* Journalling filesystem info: */ |
1189 | void *journal_info; | |
1da177e4 | 1190 | |
5eca1c10 IM |
1191 | /* Stacked block device info: */ |
1192 | struct bio_list *bio_list; | |
d89d8796 | 1193 | |
5eca1c10 IM |
1194 | /* Stack plugging: */ |
1195 | struct blk_plug *plug; | |
73c10101 | 1196 | |
5eca1c10 IM |
1197 | /* VM state: */ |
1198 | struct reclaim_state *reclaim_state; | |
1199 | ||
5eca1c10 | 1200 | struct io_context *io_context; |
1da177e4 | 1201 | |
5e1f0f09 MG |
1202 | #ifdef CONFIG_COMPACTION |
1203 | struct capture_control *capture_control; | |
1204 | #endif | |
5eca1c10 IM |
1205 | /* Ptrace state: */ |
1206 | unsigned long ptrace_message; | |
ae7795bc | 1207 | kernel_siginfo_t *last_siginfo; |
1da177e4 | 1208 | |
5eca1c10 | 1209 | struct task_io_accounting ioac; |
eb414681 JW |
1210 | #ifdef CONFIG_PSI |
1211 | /* Pressure stall state */ | |
1212 | unsigned int psi_flags; | |
1213 | #endif | |
5eca1c10 IM |
1214 | #ifdef CONFIG_TASK_XACCT |
1215 | /* Accumulated RSS usage: */ | |
1216 | u64 acct_rss_mem1; | |
1217 | /* Accumulated virtual memory usage: */ | |
1218 | u64 acct_vm_mem1; | |
1219 | /* stime + utime since last update: */ | |
1220 | u64 acct_timexpd; | |
1da177e4 LT |
1221 | #endif |
1222 | #ifdef CONFIG_CPUSETS | |
5eca1c10 IM |
1223 | /* Protected by ->alloc_lock: */ |
1224 | nodemask_t mems_allowed; | |
3b03706f | 1225 | /* Sequence number to catch updates: */ |
b7505861 | 1226 | seqcount_spinlock_t mems_allowed_seq; |
5eca1c10 IM |
1227 | int cpuset_mem_spread_rotor; |
1228 | int cpuset_slab_spread_rotor; | |
1da177e4 | 1229 | #endif |
ddbcc7e8 | 1230 | #ifdef CONFIG_CGROUPS |
5eca1c10 IM |
1231 | /* Control Group info protected by css_set_lock: */ |
1232 | struct css_set __rcu *cgroups; | |
1233 | /* cg_list protected by css_set_lock and tsk->alloc_lock: */ | |
1234 | struct list_head cg_list; | |
ddbcc7e8 | 1235 | #endif |
e6d42931 | 1236 | #ifdef CONFIG_X86_CPU_RESCTRL |
0734ded1 | 1237 | u32 closid; |
d6aaba61 | 1238 | u32 rmid; |
e02737d5 | 1239 | #endif |
42b2dd0a | 1240 | #ifdef CONFIG_FUTEX |
5eca1c10 | 1241 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1242 | #ifdef CONFIG_COMPAT |
1243 | struct compat_robust_list_head __user *compat_robust_list; | |
1244 | #endif | |
5eca1c10 IM |
1245 | struct list_head pi_state_list; |
1246 | struct futex_pi_state *pi_state_cache; | |
3f186d97 | 1247 | struct mutex futex_exit_mutex; |
3d4775df | 1248 | unsigned int futex_state; |
c7aceaba | 1249 | #endif |
cdd6c482 | 1250 | #ifdef CONFIG_PERF_EVENTS |
bd275681 | 1251 | struct perf_event_context *perf_event_ctxp; |
5eca1c10 IM |
1252 | struct mutex perf_event_mutex; |
1253 | struct list_head perf_event_list; | |
a63eaf34 | 1254 | #endif |
8f47b187 | 1255 | #ifdef CONFIG_DEBUG_PREEMPT |
5eca1c10 | 1256 | unsigned long preempt_disable_ip; |
8f47b187 | 1257 | #endif |
c7aceaba | 1258 | #ifdef CONFIG_NUMA |
5eca1c10 IM |
1259 | /* Protected by alloc_lock: */ |
1260 | struct mempolicy *mempolicy; | |
45816682 | 1261 | short il_prev; |
5eca1c10 | 1262 | short pref_node_fork; |
42b2dd0a | 1263 | #endif |
cbee9f88 | 1264 | #ifdef CONFIG_NUMA_BALANCING |
5eca1c10 IM |
1265 | int numa_scan_seq; |
1266 | unsigned int numa_scan_period; | |
1267 | unsigned int numa_scan_period_max; | |
1268 | int numa_preferred_nid; | |
1269 | unsigned long numa_migrate_retry; | |
1270 | /* Migration stamp: */ | |
1271 | u64 node_stamp; | |
1272 | u64 last_task_numa_placement; | |
1273 | u64 last_sum_exec_runtime; | |
1274 | struct callback_head numa_work; | |
1275 | ||
cb361d8c JH |
1276 | /* |
1277 | * This pointer is only modified for current in syscall and | |
1278 | * pagefault context (and for tasks being destroyed), so it can be read | |
1279 | * from any of the following contexts: | |
1280 | * - RCU read-side critical section | |
1281 | * - current->numa_group from everywhere | |
1282 | * - task's runqueue locked, task not running | |
1283 | */ | |
1284 | struct numa_group __rcu *numa_group; | |
8c8a743c | 1285 | |
745d6147 | 1286 | /* |
44dba3d5 IM |
1287 | * numa_faults is an array split into four regions: |
1288 | * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer | |
1289 | * in this precise order. | |
1290 | * | |
1291 | * faults_memory: Exponential decaying average of faults on a per-node | |
1292 | * basis. Scheduling placement decisions are made based on these | |
1293 | * counts. The values remain static for the duration of a PTE scan. | |
1294 | * faults_cpu: Track the nodes the process was running on when a NUMA | |
1295 | * hinting fault was incurred. | |
1296 | * faults_memory_buffer and faults_cpu_buffer: Record faults per node | |
1297 | * during the current scan window. When the scan completes, the counts | |
1298 | * in faults_memory and faults_cpu decay and these values are copied. | |
745d6147 | 1299 | */ |
5eca1c10 IM |
1300 | unsigned long *numa_faults; |
1301 | unsigned long total_numa_faults; | |
745d6147 | 1302 | |
04bb2f94 RR |
1303 | /* |
1304 | * numa_faults_locality tracks if faults recorded during the last | |
074c2381 MG |
1305 | * scan window were remote/local or failed to migrate. The task scan |
1306 | * period is adapted based on the locality of the faults with different | |
1307 | * weights depending on whether they were shared or private faults | |
04bb2f94 | 1308 | */ |
5eca1c10 | 1309 | unsigned long numa_faults_locality[3]; |
04bb2f94 | 1310 | |
5eca1c10 | 1311 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
1312 | #endif /* CONFIG_NUMA_BALANCING */ |
1313 | ||
d7822b1e MD |
1314 | #ifdef CONFIG_RSEQ |
1315 | struct rseq __user *rseq; | |
ee3e3ac0 | 1316 | u32 rseq_len; |
d7822b1e MD |
1317 | u32 rseq_sig; |
1318 | /* | |
1319 | * RmW on rseq_event_mask must be performed atomically | |
1320 | * with respect to preemption. | |
1321 | */ | |
1322 | unsigned long rseq_event_mask; | |
1323 | #endif | |
1324 | ||
af7f588d MD |
1325 | #ifdef CONFIG_SCHED_MM_CID |
1326 | int mm_cid; /* Current cid in mm */ | |
223baf9d MD |
1327 | int last_mm_cid; /* Most recent cid in mm */ |
1328 | int migrate_from_cpu; | |
af7f588d | 1329 | int mm_cid_active; /* Whether cid bitmap is active */ |
223baf9d | 1330 | struct callback_head cid_work; |
af7f588d MD |
1331 | #endif |
1332 | ||
5eca1c10 | 1333 | struct tlbflush_unmap_batch tlb_ubc; |
72b252ae | 1334 | |
5eca1c10 IM |
1335 | /* Cache last used pipe for splice(): */ |
1336 | struct pipe_inode_info *splice_pipe; | |
5640f768 | 1337 | |
5eca1c10 | 1338 | struct page_frag task_frag; |
5640f768 | 1339 | |
47913d4e IM |
1340 | #ifdef CONFIG_TASK_DELAY_ACCT |
1341 | struct task_delay_info *delays; | |
f4f154fd | 1342 | #endif |
47913d4e | 1343 | |
f4f154fd | 1344 | #ifdef CONFIG_FAULT_INJECTION |
5eca1c10 | 1345 | int make_it_fail; |
9049f2f6 | 1346 | unsigned int fail_nth; |
ca74e92b | 1347 | #endif |
9d823e8f | 1348 | /* |
5eca1c10 IM |
1349 | * When (nr_dirtied >= nr_dirtied_pause), it's time to call |
1350 | * balance_dirty_pages() for a dirty throttling pause: | |
9d823e8f | 1351 | */ |
5eca1c10 IM |
1352 | int nr_dirtied; |
1353 | int nr_dirtied_pause; | |
1354 | /* Start of a write-and-pause period: */ | |
1355 | unsigned long dirty_paused_when; | |
9d823e8f | 1356 | |
9745512c | 1357 | #ifdef CONFIG_LATENCYTOP |
5eca1c10 IM |
1358 | int latency_record_count; |
1359 | struct latency_record latency_record[LT_SAVECOUNT]; | |
9745512c | 1360 | #endif |
6976675d | 1361 | /* |
5eca1c10 | 1362 | * Time slack values; these are used to round up poll() and |
6976675d AV |
1363 | * select() etc timeout values. These are in nanoseconds. |
1364 | */ | |
5eca1c10 IM |
1365 | u64 timer_slack_ns; |
1366 | u64 default_timer_slack_ns; | |
f8d570a4 | 1367 | |
d73b4936 | 1368 | #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
5eca1c10 | 1369 | unsigned int kasan_depth; |
0b24becc | 1370 | #endif |
92c209ac | 1371 | |
dfd402a4 ME |
1372 | #ifdef CONFIG_KCSAN |
1373 | struct kcsan_ctx kcsan_ctx; | |
92c209ac ME |
1374 | #ifdef CONFIG_TRACE_IRQFLAGS |
1375 | struct irqtrace_events kcsan_save_irqtrace; | |
1376 | #endif | |
69562e49 ME |
1377 | #ifdef CONFIG_KCSAN_WEAK_MEMORY |
1378 | int kcsan_stack_depth; | |
1379 | #endif | |
dfd402a4 | 1380 | #endif |
5eca1c10 | 1381 | |
f80be457 AP |
1382 | #ifdef CONFIG_KMSAN |
1383 | struct kmsan_ctx kmsan_ctx; | |
1384 | #endif | |
1385 | ||
393824f6 PA |
1386 | #if IS_ENABLED(CONFIG_KUNIT) |
1387 | struct kunit *kunit_test; | |
1388 | #endif | |
1389 | ||
fb52607a | 1390 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
5eca1c10 IM |
1391 | /* Index of current stored address in ret_stack: */ |
1392 | int curr_ret_stack; | |
39eb456d | 1393 | int curr_ret_depth; |
5eca1c10 IM |
1394 | |
1395 | /* Stack of return addresses for return function tracing: */ | |
1396 | struct ftrace_ret_stack *ret_stack; | |
1397 | ||
1398 | /* Timestamp for last schedule: */ | |
1399 | unsigned long long ftrace_timestamp; | |
1400 | ||
f201ae23 FW |
1401 | /* |
1402 | * Number of functions that haven't been traced | |
5eca1c10 | 1403 | * because of depth overrun: |
f201ae23 | 1404 | */ |
5eca1c10 IM |
1405 | atomic_t trace_overrun; |
1406 | ||
1407 | /* Pause tracing: */ | |
1408 | atomic_t tracing_graph_pause; | |
f201ae23 | 1409 | #endif |
5eca1c10 | 1410 | |
ea4e2bc4 | 1411 | #ifdef CONFIG_TRACING |
5eca1c10 IM |
1412 | /* Bitmask and counter of trace recursion: */ |
1413 | unsigned long trace_recursion; | |
261842b7 | 1414 | #endif /* CONFIG_TRACING */ |
5eca1c10 | 1415 | |
5c9a8750 | 1416 | #ifdef CONFIG_KCOV |
eec028c9 AK |
1417 | /* See kernel/kcov.c for more details. */ |
1418 | ||
5eca1c10 | 1419 | /* Coverage collection mode enabled for this task (0 if disabled): */ |
0ed557aa | 1420 | unsigned int kcov_mode; |
5eca1c10 IM |
1421 | |
1422 | /* Size of the kcov_area: */ | |
1423 | unsigned int kcov_size; | |
1424 | ||
1425 | /* Buffer for coverage collection: */ | |
1426 | void *kcov_area; | |
1427 | ||
1428 | /* KCOV descriptor wired with this task or NULL: */ | |
1429 | struct kcov *kcov; | |
eec028c9 AK |
1430 | |
1431 | /* KCOV common handle for remote coverage collection: */ | |
1432 | u64 kcov_handle; | |
1433 | ||
1434 | /* KCOV sequence number: */ | |
1435 | int kcov_sequence; | |
5ff3b30a AK |
1436 | |
1437 | /* Collect coverage from softirq context: */ | |
1438 | unsigned int kcov_softirq; | |
5c9a8750 | 1439 | #endif |
5eca1c10 | 1440 | |
6f185c29 | 1441 | #ifdef CONFIG_MEMCG |
5eca1c10 IM |
1442 | struct mem_cgroup *memcg_in_oom; |
1443 | gfp_t memcg_oom_gfp_mask; | |
1444 | int memcg_oom_order; | |
b23afb93 | 1445 | |
5eca1c10 IM |
1446 | /* Number of pages to reclaim on returning to userland: */ |
1447 | unsigned int memcg_nr_pages_over_high; | |
d46eb14b SB |
1448 | |
1449 | /* Used by memcontrol for targeted memcg charge: */ | |
1450 | struct mem_cgroup *active_memcg; | |
569b846d | 1451 | #endif |
5eca1c10 | 1452 | |
1aacbd35 RG |
1453 | #ifdef CONFIG_MEMCG_KMEM |
1454 | struct obj_cgroup *objcg; | |
1455 | #endif | |
1456 | ||
d09d8df3 | 1457 | #ifdef CONFIG_BLK_CGROUP |
f05837ed | 1458 | struct gendisk *throttle_disk; |
d09d8df3 JB |
1459 | #endif |
1460 | ||
0326f5a9 | 1461 | #ifdef CONFIG_UPROBES |
5eca1c10 | 1462 | struct uprobe_task *utask; |
0326f5a9 | 1463 | #endif |
cafe5635 | 1464 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
5eca1c10 IM |
1465 | unsigned int sequential_io; |
1466 | unsigned int sequential_io_avg; | |
cafe5635 | 1467 | #endif |
5fbda3ec | 1468 | struct kmap_ctrl kmap_ctrl; |
8eb23b9f | 1469 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
5eca1c10 | 1470 | unsigned long task_state_change; |
5f220be2 TG |
1471 | # ifdef CONFIG_PREEMPT_RT |
1472 | unsigned long saved_state_change; | |
1473 | # endif | |
8eb23b9f | 1474 | #endif |
22df776a DV |
1475 | struct rcu_head rcu; |
1476 | refcount_t rcu_users; | |
5eca1c10 | 1477 | int pagefault_disabled; |
03049269 | 1478 | #ifdef CONFIG_MMU |
5eca1c10 | 1479 | struct task_struct *oom_reaper_list; |
e4a38402 | 1480 | struct timer_list oom_reaper_timer; |
03049269 | 1481 | #endif |
ba14a194 | 1482 | #ifdef CONFIG_VMAP_STACK |
5eca1c10 | 1483 | struct vm_struct *stack_vm_area; |
ba14a194 | 1484 | #endif |
68f24b08 | 1485 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
5eca1c10 | 1486 | /* A live task holds one reference: */ |
f0b89d39 | 1487 | refcount_t stack_refcount; |
d83a7cb3 JP |
1488 | #endif |
1489 | #ifdef CONFIG_LIVEPATCH | |
1490 | int patch_state; | |
0302e28d | 1491 | #endif |
e4e55b47 TH |
1492 | #ifdef CONFIG_SECURITY |
1493 | /* Used by LSM modules for access restriction: */ | |
1494 | void *security; | |
68f24b08 | 1495 | #endif |
a10787e6 SL |
1496 | #ifdef CONFIG_BPF_SYSCALL |
1497 | /* Used by BPF task local storage */ | |
1498 | struct bpf_local_storage __rcu *bpf_storage; | |
c7603cfa AN |
1499 | /* Used for BPF run context */ |
1500 | struct bpf_run_ctx *bpf_ctx; | |
a10787e6 | 1501 | #endif |
29e48ce8 | 1502 | |
afaef01c AP |
1503 | #ifdef CONFIG_GCC_PLUGIN_STACKLEAK |
1504 | unsigned long lowest_stack; | |
c8d12627 | 1505 | unsigned long prev_lowest_stack; |
afaef01c AP |
1506 | #endif |
1507 | ||
5567d11c | 1508 | #ifdef CONFIG_X86_MCE |
c0ab7ffc TL |
1509 | void __user *mce_vaddr; |
1510 | __u64 mce_kflags; | |
5567d11c | 1511 | u64 mce_addr; |
17fae129 TL |
1512 | __u64 mce_ripv : 1, |
1513 | mce_whole_page : 1, | |
1514 | __mce_reserved : 62; | |
5567d11c | 1515 | struct callback_head mce_kill_me; |
81065b35 | 1516 | int mce_count; |
5567d11c PZ |
1517 | #endif |
1518 | ||
d741bf41 PZ |
1519 | #ifdef CONFIG_KRETPROBES |
1520 | struct llist_head kretprobe_instances; | |
1521 | #endif | |
54ecbe6f MH |
1522 | #ifdef CONFIG_RETHOOK |
1523 | struct llist_head rethooks; | |
1524 | #endif | |
d741bf41 | 1525 | |
58e106e7 BS |
1526 | #ifdef CONFIG_ARCH_HAS_PARANOID_L1D_FLUSH |
1527 | /* | |
1528 | * If L1D flush is supported on mm context switch | |
1529 | * then we use this callback head to queue kill work | |
1530 | * to kill tasks that are not running on SMT disabled | |
1531 | * cores | |
1532 | */ | |
1533 | struct callback_head l1d_flush_kill; | |
1534 | #endif | |
1535 | ||
102227b9 DBO |
1536 | #ifdef CONFIG_RV |
1537 | /* | |
1538 | * Per-task RV monitor. Nowadays fixed in RV_PER_TASK_MONITORS. | |
1539 | * If we find justification for more monitors, we can think | |
1540 | * about adding more or developing a dynamic method. So far, | |
1541 | * none of these are justified. | |
1542 | */ | |
1543 | union rv_task_monitor rv[RV_PER_TASK_MONITORS]; | |
1544 | #endif | |
1545 | ||
fd593511 BB |
1546 | #ifdef CONFIG_USER_EVENTS |
1547 | struct user_event_mm *user_event_mm; | |
1548 | #endif | |
1549 | ||
29e48ce8 KC |
1550 | /* |
1551 | * New fields for task_struct should be added above here, so that | |
1552 | * they are included in the randomized portion of task_struct. | |
1553 | */ | |
1554 | randomized_struct_fields_end | |
1555 | ||
5eca1c10 IM |
1556 | /* CPU-specific state of this task: */ |
1557 | struct thread_struct thread; | |
1558 | ||
1559 | /* | |
1560 | * WARNING: on x86, 'thread_struct' contains a variable-sized | |
1561 | * structure. It *MUST* be at the end of 'task_struct'. | |
1562 | * | |
1563 | * Do not put anything below here! | |
1564 | */ | |
1da177e4 LT |
1565 | }; |
1566 | ||
06eb6184 PZ |
1567 | #define TASK_REPORT_IDLE (TASK_REPORT + 1) |
1568 | #define TASK_REPORT_MAX (TASK_REPORT_IDLE << 1) | |
1569 | ||
fa2c3254 VS |
1570 | static inline unsigned int __task_state_index(unsigned int tsk_state, |
1571 | unsigned int tsk_exit_state) | |
20435d84 | 1572 | { |
fa2c3254 | 1573 | unsigned int state = (tsk_state | tsk_exit_state) & TASK_REPORT; |
20435d84 | 1574 | |
06eb6184 PZ |
1575 | BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX); |
1576 | ||
0d6b3528 | 1577 | if ((tsk_state & TASK_IDLE) == TASK_IDLE) |
06eb6184 PZ |
1578 | state = TASK_REPORT_IDLE; |
1579 | ||
25795ef6 VS |
1580 | /* |
1581 | * We're lying here, but rather than expose a completely new task state | |
1582 | * to userspace, we can make this appear as if the task has gone through | |
1583 | * a regular rt_mutex_lock() call. | |
1584 | */ | |
0d6b3528 | 1585 | if (tsk_state & TASK_RTLOCK_WAIT) |
25795ef6 VS |
1586 | state = TASK_UNINTERRUPTIBLE; |
1587 | ||
1593baab PZ |
1588 | return fls(state); |
1589 | } | |
1590 | ||
fa2c3254 VS |
1591 | static inline unsigned int task_state_index(struct task_struct *tsk) |
1592 | { | |
1593 | return __task_state_index(READ_ONCE(tsk->__state), tsk->exit_state); | |
1594 | } | |
1595 | ||
1d48b080 | 1596 | static inline char task_index_to_char(unsigned int state) |
1593baab | 1597 | { |
8ef9925b | 1598 | static const char state_char[] = "RSDTtXZPI"; |
1593baab | 1599 | |
06eb6184 | 1600 | BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1); |
20435d84 | 1601 | |
1593baab PZ |
1602 | return state_char[state]; |
1603 | } | |
1604 | ||
1605 | static inline char task_state_to_char(struct task_struct *tsk) | |
1606 | { | |
1d48b080 | 1607 | return task_index_to_char(task_state_index(tsk)); |
20435d84 XX |
1608 | } |
1609 | ||
9ec52099 CLG |
1610 | extern struct pid *cad_pid; |
1611 | ||
1da177e4 LT |
1612 | /* |
1613 | * Per process flags | |
1614 | */ | |
01ccf592 | 1615 | #define PF_VCPU 0x00000001 /* I'm a virtual CPU */ |
5eca1c10 IM |
1616 | #define PF_IDLE 0x00000002 /* I am an IDLE thread */ |
1617 | #define PF_EXITING 0x00000004 /* Getting shut down */ | |
92307383 | 1618 | #define PF_POSTCOREDUMP 0x00000008 /* Coredumps should ignore this task */ |
01ccf592 | 1619 | #define PF_IO_WORKER 0x00000010 /* Task is an IO worker */ |
5eca1c10 IM |
1620 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1621 | #define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */ | |
1622 | #define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */ | |
1623 | #define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */ | |
1624 | #define PF_DUMPCORE 0x00000200 /* Dumped core */ | |
1625 | #define PF_SIGNALED 0x00000400 /* Killed by a signal */ | |
1626 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1627 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */ | |
1628 | #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */ | |
54e6842d | 1629 | #define PF_USER_WORKER 0x00004000 /* Kernel thread cloned from userspace thread */ |
5eca1c10 | 1630 | #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */ |
fb04563d | 1631 | #define PF__HOLE__00010000 0x00010000 |
7dea19f9 MH |
1632 | #define PF_KSWAPD 0x00020000 /* I am kswapd */ |
1633 | #define PF_MEMALLOC_NOFS 0x00040000 /* All allocation requests will inherit GFP_NOFS */ | |
1634 | #define PF_MEMALLOC_NOIO 0x00080000 /* All allocation requests will inherit GFP_NOIO */ | |
a37b0715 N |
1635 | #define PF_LOCAL_THROTTLE 0x00100000 /* Throttle writes only against the bdi I write to, |
1636 | * I am cleaning dirty pages from some other bdi. */ | |
5eca1c10 IM |
1637 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
1638 | #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */ | |
fb04563d PZ |
1639 | #define PF__HOLE__00800000 0x00800000 |
1640 | #define PF__HOLE__01000000 0x01000000 | |
1641 | #define PF__HOLE__02000000 0x02000000 | |
3bd37062 | 1642 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */ |
5eca1c10 | 1643 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
1a08ae36 | 1644 | #define PF_MEMALLOC_PIN 0x10000000 /* Allocation context constrained to zones which allow long term pinning. */ |
fb04563d PZ |
1645 | #define PF__HOLE__20000000 0x20000000 |
1646 | #define PF__HOLE__40000000 0x40000000 | |
5eca1c10 | 1647 | #define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */ |
1da177e4 LT |
1648 | |
1649 | /* | |
1650 | * Only the _current_ task can read/write to tsk->flags, but other | |
1651 | * tasks can access tsk->flags in readonly mode for example | |
1652 | * with tsk_used_math (like during threaded core dumping). | |
1653 | * There is however an exception to this rule during ptrace | |
1654 | * or during fork: the ptracer task is allowed to write to the | |
1655 | * child->flags of its traced child (same goes for fork, the parent | |
1656 | * can write to the child->flags), because we're guaranteed the | |
1657 | * child is not running and in turn not changing child->flags | |
1658 | * at the same time the parent does it. | |
1659 | */ | |
5eca1c10 IM |
1660 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) |
1661 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1662 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1663 | #define set_used_math() set_stopped_child_used_math(current) | |
1664 | ||
1da177e4 LT |
1665 | #define conditional_stopped_child_used_math(condition, child) \ |
1666 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
5eca1c10 IM |
1667 | |
1668 | #define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current) | |
1669 | ||
1da177e4 LT |
1670 | #define copy_to_stopped_child_used_math(child) \ |
1671 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
5eca1c10 | 1672 | |
1da177e4 | 1673 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ |
5eca1c10 IM |
1674 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) |
1675 | #define used_math() tsk_used_math(current) | |
1da177e4 | 1676 | |
83d40a61 | 1677 | static __always_inline bool is_percpu_thread(void) |
62ec05dd TG |
1678 | { |
1679 | #ifdef CONFIG_SMP | |
1680 | return (current->flags & PF_NO_SETAFFINITY) && | |
1681 | (current->nr_cpus_allowed == 1); | |
1682 | #else | |
1683 | return true; | |
1684 | #endif | |
1685 | } | |
1686 | ||
1d4457f9 | 1687 | /* Per-process atomic flags. */ |
5eca1c10 IM |
1688 | #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ |
1689 | #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ | |
1690 | #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ | |
356e4bff TG |
1691 | #define PFA_SPEC_SSB_DISABLE 3 /* Speculative Store Bypass disabled */ |
1692 | #define PFA_SPEC_SSB_FORCE_DISABLE 4 /* Speculative Store Bypass force disabled*/ | |
9137bb27 TG |
1693 | #define PFA_SPEC_IB_DISABLE 5 /* Indirect branch speculation restricted */ |
1694 | #define PFA_SPEC_IB_FORCE_DISABLE 6 /* Indirect branch speculation permanently restricted */ | |
71368af9 | 1695 | #define PFA_SPEC_SSB_NOEXEC 7 /* Speculative Store Bypass clear on execve() */ |
1d4457f9 | 1696 | |
e0e5070b ZL |
1697 | #define TASK_PFA_TEST(name, func) \ |
1698 | static inline bool task_##func(struct task_struct *p) \ | |
1699 | { return test_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1700 | |
e0e5070b ZL |
1701 | #define TASK_PFA_SET(name, func) \ |
1702 | static inline void task_set_##func(struct task_struct *p) \ | |
1703 | { set_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1704 | |
e0e5070b ZL |
1705 | #define TASK_PFA_CLEAR(name, func) \ |
1706 | static inline void task_clear_##func(struct task_struct *p) \ | |
1707 | { clear_bit(PFA_##name, &p->atomic_flags); } | |
1708 | ||
1709 | TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) | |
1710 | TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) | |
1d4457f9 | 1711 | |
2ad654bc ZL |
1712 | TASK_PFA_TEST(SPREAD_PAGE, spread_page) |
1713 | TASK_PFA_SET(SPREAD_PAGE, spread_page) | |
1714 | TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) | |
1715 | ||
1716 | TASK_PFA_TEST(SPREAD_SLAB, spread_slab) | |
1717 | TASK_PFA_SET(SPREAD_SLAB, spread_slab) | |
1718 | TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) | |
1d4457f9 | 1719 | |
356e4bff TG |
1720 | TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable) |
1721 | TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable) | |
1722 | TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable) | |
1723 | ||
71368af9 WL |
1724 | TASK_PFA_TEST(SPEC_SSB_NOEXEC, spec_ssb_noexec) |
1725 | TASK_PFA_SET(SPEC_SSB_NOEXEC, spec_ssb_noexec) | |
1726 | TASK_PFA_CLEAR(SPEC_SSB_NOEXEC, spec_ssb_noexec) | |
1727 | ||
356e4bff TG |
1728 | TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) |
1729 | TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) | |
1730 | ||
9137bb27 TG |
1731 | TASK_PFA_TEST(SPEC_IB_DISABLE, spec_ib_disable) |
1732 | TASK_PFA_SET(SPEC_IB_DISABLE, spec_ib_disable) | |
1733 | TASK_PFA_CLEAR(SPEC_IB_DISABLE, spec_ib_disable) | |
1734 | ||
1735 | TASK_PFA_TEST(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable) | |
1736 | TASK_PFA_SET(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable) | |
1737 | ||
5eca1c10 | 1738 | static inline void |
717a94b5 | 1739 | current_restore_flags(unsigned long orig_flags, unsigned long flags) |
907aed48 | 1740 | { |
717a94b5 N |
1741 | current->flags &= ~flags; |
1742 | current->flags |= orig_flags & flags; | |
907aed48 MG |
1743 | } |
1744 | ||
5eca1c10 | 1745 | extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial); |
2ef269ef | 1746 | extern int task_can_attach(struct task_struct *p); |
85989106 DE |
1747 | extern int dl_bw_alloc(int cpu, u64 dl_bw); |
1748 | extern void dl_bw_free(int cpu, u64 dl_bw); | |
1da177e4 | 1749 | #ifdef CONFIG_SMP |
ae894083 CS |
1750 | |
1751 | /* do_set_cpus_allowed() - consider using set_cpus_allowed_ptr() instead */ | |
5eca1c10 | 1752 | extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask); |
ae894083 CS |
1753 | |
1754 | /** | |
1755 | * set_cpus_allowed_ptr - set CPU affinity mask of a task | |
1756 | * @p: the task | |
1757 | * @new_mask: CPU affinity mask | |
1758 | * | |
1759 | * Return: zero if successful, or a negative error code | |
1760 | */ | |
5eca1c10 | 1761 | extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask); |
b90ca8ba WD |
1762 | extern int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node); |
1763 | extern void release_user_cpus_ptr(struct task_struct *p); | |
234b8ab6 | 1764 | extern int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask); |
07ec77a1 WD |
1765 | extern void force_compatible_cpus_allowed_ptr(struct task_struct *p); |
1766 | extern void relax_compatible_cpus_allowed_ptr(struct task_struct *p); | |
1da177e4 | 1767 | #else |
5eca1c10 | 1768 | static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) |
1e1b6c51 KM |
1769 | { |
1770 | } | |
5eca1c10 | 1771 | static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask) |
1da177e4 | 1772 | { |
96f874e2 | 1773 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1774 | return -EINVAL; |
1775 | return 0; | |
1776 | } | |
b90ca8ba WD |
1777 | static inline int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node) |
1778 | { | |
1779 | if (src->user_cpus_ptr) | |
1780 | return -EINVAL; | |
1781 | return 0; | |
1782 | } | |
1783 | static inline void release_user_cpus_ptr(struct task_struct *p) | |
1784 | { | |
1785 | WARN_ON(p->user_cpus_ptr); | |
1786 | } | |
234b8ab6 WD |
1787 | |
1788 | static inline int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask) | |
1789 | { | |
1790 | return 0; | |
1791 | } | |
1da177e4 | 1792 | #endif |
e0ad9556 | 1793 | |
fa93384f | 1794 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
1795 | extern void set_user_nice(struct task_struct *p, long nice); |
1796 | extern int task_prio(const struct task_struct *p); | |
5eca1c10 | 1797 | |
d0ea0268 DY |
1798 | /** |
1799 | * task_nice - return the nice value of a given task. | |
1800 | * @p: the task in question. | |
1801 | * | |
1802 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
1803 | */ | |
1804 | static inline int task_nice(const struct task_struct *p) | |
1805 | { | |
1806 | return PRIO_TO_NICE((p)->static_prio); | |
1807 | } | |
5eca1c10 | 1808 | |
36c8b586 IM |
1809 | extern int can_nice(const struct task_struct *p, const int nice); |
1810 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 1811 | extern int idle_cpu(int cpu); |
943d355d | 1812 | extern int available_idle_cpu(int cpu); |
5eca1c10 IM |
1813 | extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *); |
1814 | extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *); | |
8b700983 PZ |
1815 | extern void sched_set_fifo(struct task_struct *p); |
1816 | extern void sched_set_fifo_low(struct task_struct *p); | |
1817 | extern void sched_set_normal(struct task_struct *p, int nice); | |
5eca1c10 | 1818 | extern int sched_setattr(struct task_struct *, const struct sched_attr *); |
794a56eb | 1819 | extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *); |
36c8b586 | 1820 | extern struct task_struct *idle_task(int cpu); |
5eca1c10 | 1821 | |
c4f30608 PM |
1822 | /** |
1823 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 1824 | * @p: the task in question. |
e69f6186 YB |
1825 | * |
1826 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 1827 | */ |
c94a88f3 | 1828 | static __always_inline bool is_idle_task(const struct task_struct *p) |
c4f30608 | 1829 | { |
c1de45ca | 1830 | return !!(p->flags & PF_IDLE); |
c4f30608 | 1831 | } |
5eca1c10 | 1832 | |
36c8b586 | 1833 | extern struct task_struct *curr_task(int cpu); |
a458ae2e | 1834 | extern void ia64_set_curr_task(int cpu, struct task_struct *p); |
1da177e4 LT |
1835 | |
1836 | void yield(void); | |
1837 | ||
1da177e4 | 1838 | union thread_union { |
0500871f | 1839 | struct task_struct task; |
c65eacbe | 1840 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1da177e4 | 1841 | struct thread_info thread_info; |
c65eacbe | 1842 | #endif |
1da177e4 LT |
1843 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
1844 | }; | |
1845 | ||
0500871f DH |
1846 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1847 | extern struct thread_info init_thread_info; | |
1848 | #endif | |
1849 | ||
1850 | extern unsigned long init_stack[THREAD_SIZE / sizeof(unsigned long)]; | |
1851 | ||
f3ac6067 | 1852 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
bcf9033e | 1853 | # define task_thread_info(task) (&(task)->thread_info) |
f3ac6067 IM |
1854 | #elif !defined(__HAVE_THREAD_FUNCTIONS) |
1855 | # define task_thread_info(task) ((struct thread_info *)(task)->stack) | |
1856 | #endif | |
1857 | ||
198fe21b PE |
1858 | /* |
1859 | * find a task by one of its numerical ids | |
1860 | * | |
198fe21b PE |
1861 | * find_task_by_pid_ns(): |
1862 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1863 | * find_task_by_vpid(): |
1864 | * finds a task by its virtual pid | |
198fe21b | 1865 | * |
e49859e7 | 1866 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
1867 | */ |
1868 | ||
228ebcbe | 1869 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
5eca1c10 | 1870 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns); |
198fe21b | 1871 | |
2ee08260 MR |
1872 | /* |
1873 | * find a task by its virtual pid and get the task struct | |
1874 | */ | |
1875 | extern struct task_struct *find_get_task_by_vpid(pid_t nr); | |
1876 | ||
b3c97528 HH |
1877 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
1878 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 1879 | extern void wake_up_new_task(struct task_struct *tsk); |
5eca1c10 | 1880 | |
1da177e4 | 1881 | #ifdef CONFIG_SMP |
5eca1c10 | 1882 | extern void kick_process(struct task_struct *tsk); |
1da177e4 | 1883 | #else |
5eca1c10 | 1884 | static inline void kick_process(struct task_struct *tsk) { } |
1da177e4 | 1885 | #endif |
1da177e4 | 1886 | |
82b89778 | 1887 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
5eca1c10 | 1888 | |
82b89778 AH |
1889 | static inline void set_task_comm(struct task_struct *tsk, const char *from) |
1890 | { | |
1891 | __set_task_comm(tsk, from, false); | |
1892 | } | |
5eca1c10 | 1893 | |
3756f640 AB |
1894 | extern char *__get_task_comm(char *to, size_t len, struct task_struct *tsk); |
1895 | #define get_task_comm(buf, tsk) ({ \ | |
1896 | BUILD_BUG_ON(sizeof(buf) != TASK_COMM_LEN); \ | |
1897 | __get_task_comm(buf, sizeof(buf), tsk); \ | |
1898 | }) | |
1da177e4 LT |
1899 | |
1900 | #ifdef CONFIG_SMP | |
2a0a24eb TG |
1901 | static __always_inline void scheduler_ipi(void) |
1902 | { | |
1903 | /* | |
1904 | * Fold TIF_NEED_RESCHED into the preempt_count; anybody setting | |
1905 | * TIF_NEED_RESCHED remotely (for the first time) will also send | |
1906 | * this IPI. | |
1907 | */ | |
1908 | preempt_fold_need_resched(); | |
1909 | } | |
1da177e4 | 1910 | #else |
184748cc | 1911 | static inline void scheduler_ipi(void) { } |
1da177e4 LT |
1912 | #endif |
1913 | ||
d5e15866 PZ |
1914 | extern unsigned long wait_task_inactive(struct task_struct *, unsigned int match_state); |
1915 | ||
5eca1c10 IM |
1916 | /* |
1917 | * Set thread flags in other task's structures. | |
1918 | * See asm/thread_info.h for TIF_xxxx flags available: | |
1da177e4 LT |
1919 | */ |
1920 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1921 | { | |
a1261f54 | 1922 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1923 | } |
1924 | ||
1925 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1926 | { | |
a1261f54 | 1927 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1928 | } |
1929 | ||
93ee37c2 DM |
1930 | static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag, |
1931 | bool value) | |
1932 | { | |
1933 | update_ti_thread_flag(task_thread_info(tsk), flag, value); | |
1934 | } | |
1935 | ||
1da177e4 LT |
1936 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
1937 | { | |
a1261f54 | 1938 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1939 | } |
1940 | ||
1941 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1942 | { | |
a1261f54 | 1943 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1944 | } |
1945 | ||
1946 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1947 | { | |
a1261f54 | 1948 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1949 | } |
1950 | ||
1951 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
1952 | { | |
1953 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1954 | } | |
1955 | ||
1956 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
1957 | { | |
1958 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1959 | } | |
1960 | ||
8ae121ac GH |
1961 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
1962 | { | |
1963 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
1964 | } | |
1965 | ||
1da177e4 LT |
1966 | /* |
1967 | * cond_resched() and cond_resched_lock(): latency reduction via | |
1968 | * explicit rescheduling in places that are safe. The return | |
1969 | * value indicates whether a reschedule was done in fact. | |
1970 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1da177e4 | 1971 | */ |
b965f1dd PZI |
1972 | #if !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC) |
1973 | extern int __cond_resched(void); | |
1974 | ||
99cf983c | 1975 | #if defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_CALL) |
b965f1dd | 1976 | |
e3ff7c60 JP |
1977 | void sched_dynamic_klp_enable(void); |
1978 | void sched_dynamic_klp_disable(void); | |
1979 | ||
b965f1dd PZI |
1980 | DECLARE_STATIC_CALL(cond_resched, __cond_resched); |
1981 | ||
1982 | static __always_inline int _cond_resched(void) | |
1983 | { | |
ef72661e | 1984 | return static_call_mod(cond_resched)(); |
b965f1dd PZI |
1985 | } |
1986 | ||
99cf983c | 1987 | #elif defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY) |
e3ff7c60 | 1988 | |
99cf983c MR |
1989 | extern int dynamic_cond_resched(void); |
1990 | ||
1991 | static __always_inline int _cond_resched(void) | |
1992 | { | |
1993 | return dynamic_cond_resched(); | |
1994 | } | |
1995 | ||
e3ff7c60 | 1996 | #else /* !CONFIG_PREEMPTION */ |
b965f1dd PZI |
1997 | |
1998 | static inline int _cond_resched(void) | |
1999 | { | |
e3ff7c60 | 2000 | klp_sched_try_switch(); |
b965f1dd PZI |
2001 | return __cond_resched(); |
2002 | } | |
2003 | ||
e3ff7c60 | 2004 | #endif /* PREEMPT_DYNAMIC && CONFIG_HAVE_PREEMPT_DYNAMIC_CALL */ |
b965f1dd | 2005 | |
e3ff7c60 | 2006 | #else /* CONFIG_PREEMPTION && !CONFIG_PREEMPT_DYNAMIC */ |
b965f1dd | 2007 | |
e3ff7c60 JP |
2008 | static inline int _cond_resched(void) |
2009 | { | |
2010 | klp_sched_try_switch(); | |
2011 | return 0; | |
2012 | } | |
b965f1dd | 2013 | |
e3ff7c60 | 2014 | #endif /* !CONFIG_PREEMPTION || CONFIG_PREEMPT_DYNAMIC */ |
6f80bd98 | 2015 | |
613afbf8 | 2016 | #define cond_resched() ({ \ |
874f670e | 2017 | __might_resched(__FILE__, __LINE__, 0); \ |
613afbf8 FW |
2018 | _cond_resched(); \ |
2019 | }) | |
6f80bd98 | 2020 | |
613afbf8 | 2021 | extern int __cond_resched_lock(spinlock_t *lock); |
f3d4b4b1 BG |
2022 | extern int __cond_resched_rwlock_read(rwlock_t *lock); |
2023 | extern int __cond_resched_rwlock_write(rwlock_t *lock); | |
613afbf8 | 2024 | |
50e081b9 TG |
2025 | #define MIGHT_RESCHED_RCU_SHIFT 8 |
2026 | #define MIGHT_RESCHED_PREEMPT_MASK ((1U << MIGHT_RESCHED_RCU_SHIFT) - 1) | |
2027 | ||
3e9cc688 TG |
2028 | #ifndef CONFIG_PREEMPT_RT |
2029 | /* | |
2030 | * Non RT kernels have an elevated preempt count due to the held lock, | |
2031 | * but are not allowed to be inside a RCU read side critical section | |
2032 | */ | |
2033 | # define PREEMPT_LOCK_RESCHED_OFFSETS PREEMPT_LOCK_OFFSET | |
2034 | #else | |
2035 | /* | |
2036 | * spin/rw_lock() on RT implies rcu_read_lock(). The might_sleep() check in | |
2037 | * cond_resched*lock() has to take that into account because it checks for | |
2038 | * preempt_count() and rcu_preempt_depth(). | |
2039 | */ | |
2040 | # define PREEMPT_LOCK_RESCHED_OFFSETS \ | |
2041 | (PREEMPT_LOCK_OFFSET + (1U << MIGHT_RESCHED_RCU_SHIFT)) | |
2042 | #endif | |
2043 | ||
2044 | #define cond_resched_lock(lock) ({ \ | |
2045 | __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \ | |
2046 | __cond_resched_lock(lock); \ | |
613afbf8 FW |
2047 | }) |
2048 | ||
3e9cc688 TG |
2049 | #define cond_resched_rwlock_read(lock) ({ \ |
2050 | __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \ | |
2051 | __cond_resched_rwlock_read(lock); \ | |
f3d4b4b1 BG |
2052 | }) |
2053 | ||
3e9cc688 TG |
2054 | #define cond_resched_rwlock_write(lock) ({ \ |
2055 | __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \ | |
2056 | __cond_resched_rwlock_write(lock); \ | |
f3d4b4b1 BG |
2057 | }) |
2058 | ||
cfe43f47 VS |
2059 | #ifdef CONFIG_PREEMPT_DYNAMIC |
2060 | ||
2061 | extern bool preempt_model_none(void); | |
2062 | extern bool preempt_model_voluntary(void); | |
2063 | extern bool preempt_model_full(void); | |
2064 | ||
2065 | #else | |
2066 | ||
2067 | static inline bool preempt_model_none(void) | |
2068 | { | |
2069 | return IS_ENABLED(CONFIG_PREEMPT_NONE); | |
2070 | } | |
2071 | static inline bool preempt_model_voluntary(void) | |
2072 | { | |
2073 | return IS_ENABLED(CONFIG_PREEMPT_VOLUNTARY); | |
2074 | } | |
2075 | static inline bool preempt_model_full(void) | |
2076 | { | |
2077 | return IS_ENABLED(CONFIG_PREEMPT); | |
2078 | } | |
2079 | ||
2080 | #endif | |
2081 | ||
2082 | static inline bool preempt_model_rt(void) | |
2083 | { | |
2084 | return IS_ENABLED(CONFIG_PREEMPT_RT); | |
2085 | } | |
2086 | ||
2087 | /* | |
2088 | * Does the preemption model allow non-cooperative preemption? | |
2089 | * | |
2090 | * For !CONFIG_PREEMPT_DYNAMIC kernels this is an exact match with | |
2091 | * CONFIG_PREEMPTION; for CONFIG_PREEMPT_DYNAMIC this doesn't work as the | |
2092 | * kernel is *built* with CONFIG_PREEMPTION=y but may run with e.g. the | |
2093 | * PREEMPT_NONE model. | |
2094 | */ | |
2095 | static inline bool preempt_model_preemptible(void) | |
2096 | { | |
2097 | return preempt_model_full() || preempt_model_rt(); | |
2098 | } | |
2099 | ||
75f93fed PZ |
2100 | static __always_inline bool need_resched(void) |
2101 | { | |
2102 | return unlikely(tif_need_resched()); | |
2103 | } | |
2104 | ||
1da177e4 LT |
2105 | /* |
2106 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2107 | */ | |
2108 | #ifdef CONFIG_SMP | |
2109 | ||
2110 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2111 | { | |
c546951d | 2112 | return READ_ONCE(task_thread_info(p)->cpu); |
1da177e4 LT |
2113 | } |
2114 | ||
c65cc870 | 2115 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2116 | |
2117 | #else | |
2118 | ||
2119 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2120 | { | |
2121 | return 0; | |
2122 | } | |
2123 | ||
2124 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2125 | { | |
2126 | } | |
2127 | ||
2128 | #endif /* CONFIG_SMP */ | |
2129 | ||
a1dfb631 | 2130 | extern bool sched_task_on_rq(struct task_struct *p); |
42a20f86 | 2131 | extern unsigned long get_wchan(struct task_struct *p); |
e386b672 | 2132 | extern struct task_struct *cpu_curr_snapshot(int cpu); |
a1dfb631 | 2133 | |
72375a88 KO |
2134 | #include <linux/spinlock.h> |
2135 | ||
d9345c65 PX |
2136 | /* |
2137 | * In order to reduce various lock holder preemption latencies provide an | |
2138 | * interface to see if a vCPU is currently running or not. | |
2139 | * | |
2140 | * This allows us to terminate optimistic spin loops and block, analogous to | |
2141 | * the native optimistic spin heuristic of testing if the lock owner task is | |
2142 | * running or not. | |
2143 | */ | |
2144 | #ifndef vcpu_is_preempted | |
42fd8baa QC |
2145 | static inline bool vcpu_is_preempted(int cpu) |
2146 | { | |
2147 | return false; | |
2148 | } | |
d9345c65 PX |
2149 | #endif |
2150 | ||
96f874e2 RR |
2151 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2152 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2153 | |
82455257 DH |
2154 | #ifndef TASK_SIZE_OF |
2155 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2156 | #endif | |
2157 | ||
a5418be9 | 2158 | #ifdef CONFIG_SMP |
c0bed69d KW |
2159 | static inline bool owner_on_cpu(struct task_struct *owner) |
2160 | { | |
2161 | /* | |
2162 | * As lock holder preemption issue, we both skip spinning if | |
2163 | * task is not on cpu or its cpu is preempted | |
2164 | */ | |
4cf75fd4 | 2165 | return READ_ONCE(owner->on_cpu) && !vcpu_is_preempted(task_cpu(owner)); |
c0bed69d KW |
2166 | } |
2167 | ||
a5418be9 | 2168 | /* Returns effective CPU energy utilization, as seen by the scheduler */ |
bb447999 | 2169 | unsigned long sched_cpu_util(int cpu); |
a5418be9 VK |
2170 | #endif /* CONFIG_SMP */ |
2171 | ||
6e33cad0 PZ |
2172 | #ifdef CONFIG_SCHED_CORE |
2173 | extern void sched_core_free(struct task_struct *tsk); | |
85dd3f61 | 2174 | extern void sched_core_fork(struct task_struct *p); |
7ac592aa CH |
2175 | extern int sched_core_share_pid(unsigned int cmd, pid_t pid, enum pid_type type, |
2176 | unsigned long uaddr); | |
548796e2 | 2177 | extern int sched_core_idle_cpu(int cpu); |
6e33cad0 PZ |
2178 | #else |
2179 | static inline void sched_core_free(struct task_struct *tsk) { } | |
85dd3f61 | 2180 | static inline void sched_core_fork(struct task_struct *p) { } |
548796e2 | 2181 | static inline int sched_core_idle_cpu(int cpu) { return idle_cpu(cpu); } |
6e33cad0 PZ |
2182 | #endif |
2183 | ||
d664e399 TG |
2184 | extern void sched_set_stop_task(int cpu, struct task_struct *stop); |
2185 | ||
1da177e4 | 2186 | #endif |