Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
97fb7a0a IM |
2 | /* |
3 | * Scheduler internal types and methods: | |
4 | */ | |
95458477 IM |
5 | #ifndef _KERNEL_SCHED_SCHED_H |
6 | #define _KERNEL_SCHED_SCHED_H | |
325ea10c | 7 | |
801c1419 | 8 | #include <linux/sched/affinity.h> |
dfc3401a | 9 | #include <linux/sched/autogroup.h> |
55687da1 | 10 | #include <linux/sched/cpufreq.h> |
325ea10c | 11 | #include <linux/sched/deadline.h> |
4ff8f2ca | 12 | #include <linux/sched.h> |
325ea10c IM |
13 | #include <linux/sched/loadavg.h> |
14 | #include <linux/sched/mm.h> | |
801c1419 | 15 | #include <linux/sched/rseq_api.h> |
325ea10c | 16 | #include <linux/sched/signal.h> |
321a874a | 17 | #include <linux/sched/smt.h> |
325ea10c IM |
18 | #include <linux/sched/stat.h> |
19 | #include <linux/sched/sysctl.h> | |
4ff8f2ca | 20 | #include <linux/sched/task_flags.h> |
29930025 | 21 | #include <linux/sched/task.h> |
325ea10c | 22 | #include <linux/sched/topology.h> |
ef8bd77f | 23 | |
4ff8f2ca | 24 | #include <linux/atomic.h> |
801c1419 | 25 | #include <linux/bitmap.h> |
4ff8f2ca | 26 | #include <linux/bug.h> |
801c1419 | 27 | #include <linux/capability.h> |
4ff8f2ca | 28 | #include <linux/cgroup_api.h> |
801c1419 | 29 | #include <linux/cgroup.h> |
e67198cc | 30 | #include <linux/context_tracking.h> |
325ea10c | 31 | #include <linux/cpufreq.h> |
801c1419 | 32 | #include <linux/cpumask_api.h> |
325ea10c | 33 | #include <linux/ctype.h> |
801c1419 | 34 | #include <linux/file.h> |
4ff8f2ca | 35 | #include <linux/fs_api.h> |
f96eca43 IM |
36 | #include <linux/hrtimer_api.h> |
37 | #include <linux/interrupt.h> | |
4ff8f2ca | 38 | #include <linux/irq_work.h> |
801c1419 IM |
39 | #include <linux/jiffies.h> |
40 | #include <linux/kref_api.h> | |
325ea10c | 41 | #include <linux/kthread.h> |
f96eca43 | 42 | #include <linux/ktime_api.h> |
801c1419 | 43 | #include <linux/lockdep_api.h> |
4ff8f2ca IM |
44 | #include <linux/lockdep.h> |
45 | #include <linux/minmax.h> | |
46 | #include <linux/mm.h> | |
801c1419 IM |
47 | #include <linux/module.h> |
48 | #include <linux/mutex_api.h> | |
4ff8f2ca | 49 | #include <linux/plist.h> |
801c1419 | 50 | #include <linux/poll.h> |
325ea10c | 51 | #include <linux/proc_fs.h> |
325ea10c | 52 | #include <linux/profile.h> |
eb414681 | 53 | #include <linux/psi.h> |
4ff8f2ca | 54 | #include <linux/rcupdate.h> |
801c1419 IM |
55 | #include <linux/seq_file.h> |
56 | #include <linux/seqlock.h> | |
f96eca43 IM |
57 | #include <linux/softirq.h> |
58 | #include <linux/spinlock_api.h> | |
4ff8f2ca | 59 | #include <linux/static_key.h> |
029632fb | 60 | #include <linux/stop_machine.h> |
801c1419 | 61 | #include <linux/syscalls_api.h> |
325ea10c | 62 | #include <linux/syscalls.h> |
4ff8f2ca | 63 | #include <linux/tick.h> |
801c1419 IM |
64 | #include <linux/topology.h> |
65 | #include <linux/types.h> | |
f96eca43 | 66 | #include <linux/u64_stats_sync_api.h> |
801c1419 IM |
67 | #include <linux/uaccess.h> |
68 | #include <linux/wait_api.h> | |
4ff8f2ca | 69 | #include <linux/wait_bit.h> |
801c1419 IM |
70 | #include <linux/workqueue_api.h> |
71 | ||
72 | #include <trace/events/power.h> | |
4ff8f2ca | 73 | #include <trace/events/sched.h> |
801c1419 IM |
74 | |
75 | #include "../workqueue_internal.h" | |
76 | ||
4ff8f2ca IM |
77 | #ifdef CONFIG_CGROUP_SCHED |
78 | #include <linux/cgroup.h> | |
79 | #include <linux/psi.h> | |
80 | #endif | |
325ea10c | 81 | |
4ff8f2ca IM |
82 | #ifdef CONFIG_SCHED_DEBUG |
83 | # include <linux/static_key.h> | |
84 | #endif | |
029632fb | 85 | |
7fce777c | 86 | #ifdef CONFIG_PARAVIRT |
325ea10c | 87 | # include <asm/paravirt.h> |
4ff8f2ca | 88 | # include <asm/paravirt_api_clock.h> |
7fce777c IM |
89 | #endif |
90 | ||
391e43da | 91 | #include "cpupri.h" |
6bfd6d72 | 92 | #include "cpudeadline.h" |
029632fb | 93 | |
9148a3a1 | 94 | #ifdef CONFIG_SCHED_DEBUG |
4ff8f2ca | 95 | # define SCHED_WARN_ON(x) WARN_ONCE(x, #x) |
9148a3a1 | 96 | #else |
4ff8f2ca | 97 | # define SCHED_WARN_ON(x) ({ (void)(x), 0; }) |
9148a3a1 PZ |
98 | #endif |
99 | ||
45ceebf7 | 100 | struct rq; |
442bf3aa | 101 | struct cpuidle_state; |
45ceebf7 | 102 | |
da0c1e65 KT |
103 | /* task_struct::on_rq states: */ |
104 | #define TASK_ON_RQ_QUEUED 1 | |
cca26e80 | 105 | #define TASK_ON_RQ_MIGRATING 2 |
da0c1e65 | 106 | |
029632fb PZ |
107 | extern __read_mostly int scheduler_running; |
108 | ||
45ceebf7 PG |
109 | extern unsigned long calc_load_update; |
110 | extern atomic_long_t calc_load_tasks; | |
111 | ||
a60707d7 ZN |
112 | extern unsigned int sysctl_sched_child_runs_first; |
113 | ||
3289bdb4 | 114 | extern void calc_global_load_tick(struct rq *this_rq); |
d60585c5 | 115 | extern long calc_load_fold_active(struct rq *this_rq, long adjust); |
3289bdb4 | 116 | |
9d246053 | 117 | extern void call_trace_sched_update_nr_running(struct rq *rq, int count); |
d9ab0e63 ZN |
118 | |
119 | extern unsigned int sysctl_sched_rt_period; | |
120 | extern int sysctl_sched_rt_runtime; | |
dafd7a9d | 121 | extern int sched_rr_timeslice; |
d9ab0e63 | 122 | |
029632fb PZ |
123 | /* |
124 | * Helpers for converting nanosecond timing to jiffy resolution | |
125 | */ | |
126 | #define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ)) | |
127 | ||
cc1f4b1f LZ |
128 | /* |
129 | * Increase resolution of nice-level calculations for 64-bit architectures. | |
130 | * The extra resolution improves shares distribution and load balancing of | |
131 | * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup | |
132 | * hierarchies, especially on larger systems. This is not a user-visible change | |
133 | * and does not change the user-interface for setting shares/weights. | |
134 | * | |
135 | * We increase resolution only if we have enough bits to allow this increased | |
97fb7a0a IM |
136 | * resolution (i.e. 64-bit). The costs for increasing resolution when 32-bit |
137 | * are pretty high and the returns do not justify the increased costs. | |
2159197d | 138 | * |
97fb7a0a IM |
139 | * Really only required when CONFIG_FAIR_GROUP_SCHED=y is also set, but to |
140 | * increase coverage and consistency always enable it on 64-bit platforms. | |
cc1f4b1f | 141 | */ |
2159197d | 142 | #ifdef CONFIG_64BIT |
172895e6 | 143 | # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT + SCHED_FIXEDPOINT_SHIFT) |
6ecdd749 | 144 | # define scale_load(w) ((w) << SCHED_FIXEDPOINT_SHIFT) |
26cf5222 MW |
145 | # define scale_load_down(w) \ |
146 | ({ \ | |
147 | unsigned long __w = (w); \ | |
148 | if (__w) \ | |
149 | __w = max(2UL, __w >> SCHED_FIXEDPOINT_SHIFT); \ | |
150 | __w; \ | |
151 | }) | |
cc1f4b1f | 152 | #else |
172895e6 | 153 | # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT) |
cc1f4b1f LZ |
154 | # define scale_load(w) (w) |
155 | # define scale_load_down(w) (w) | |
156 | #endif | |
157 | ||
6ecdd749 | 158 | /* |
172895e6 YD |
159 | * Task weight (visible to users) and its load (invisible to users) have |
160 | * independent resolution, but they should be well calibrated. We use | |
161 | * scale_load() and scale_load_down(w) to convert between them. The | |
162 | * following must be true: | |
163 | * | |
9d061ba6 | 164 | * scale_load(sched_prio_to_weight[NICE_TO_PRIO(0)-MAX_RT_PRIO]) == NICE_0_LOAD |
172895e6 | 165 | * |
6ecdd749 | 166 | */ |
172895e6 | 167 | #define NICE_0_LOAD (1L << NICE_0_LOAD_SHIFT) |
029632fb | 168 | |
332ac17e DF |
169 | /* |
170 | * Single value that decides SCHED_DEADLINE internal math precision. | |
171 | * 10 -> just above 1us | |
172 | * 9 -> just above 0.5us | |
173 | */ | |
97fb7a0a | 174 | #define DL_SCALE 10 |
029632fb PZ |
175 | |
176 | /* | |
97fb7a0a | 177 | * Single value that denotes runtime == period, ie unlimited time. |
029632fb | 178 | */ |
97fb7a0a | 179 | #define RUNTIME_INF ((u64)~0ULL) |
029632fb | 180 | |
20f9cd2a HA |
181 | static inline int idle_policy(int policy) |
182 | { | |
183 | return policy == SCHED_IDLE; | |
184 | } | |
d50dde5a DF |
185 | static inline int fair_policy(int policy) |
186 | { | |
187 | return policy == SCHED_NORMAL || policy == SCHED_BATCH; | |
188 | } | |
189 | ||
029632fb PZ |
190 | static inline int rt_policy(int policy) |
191 | { | |
d50dde5a | 192 | return policy == SCHED_FIFO || policy == SCHED_RR; |
029632fb PZ |
193 | } |
194 | ||
aab03e05 DF |
195 | static inline int dl_policy(int policy) |
196 | { | |
197 | return policy == SCHED_DEADLINE; | |
198 | } | |
20f9cd2a HA |
199 | static inline bool valid_policy(int policy) |
200 | { | |
201 | return idle_policy(policy) || fair_policy(policy) || | |
202 | rt_policy(policy) || dl_policy(policy); | |
203 | } | |
aab03e05 | 204 | |
1da1843f VK |
205 | static inline int task_has_idle_policy(struct task_struct *p) |
206 | { | |
207 | return idle_policy(p->policy); | |
208 | } | |
209 | ||
029632fb PZ |
210 | static inline int task_has_rt_policy(struct task_struct *p) |
211 | { | |
212 | return rt_policy(p->policy); | |
213 | } | |
214 | ||
aab03e05 DF |
215 | static inline int task_has_dl_policy(struct task_struct *p) |
216 | { | |
217 | return dl_policy(p->policy); | |
218 | } | |
219 | ||
07881166 JL |
220 | #define cap_scale(v, s) ((v)*(s) >> SCHED_CAPACITY_SHIFT) |
221 | ||
d76343c6 VS |
222 | static inline void update_avg(u64 *avg, u64 sample) |
223 | { | |
224 | s64 diff = sample - *avg; | |
225 | *avg += diff / 8; | |
226 | } | |
227 | ||
39a2a6eb VS |
228 | /* |
229 | * Shifting a value by an exponent greater *or equal* to the size of said value | |
230 | * is UB; cap at size-1. | |
231 | */ | |
232 | #define shr_bound(val, shift) \ | |
233 | (val >> min_t(typeof(shift), shift, BITS_PER_TYPE(typeof(val)) - 1)) | |
234 | ||
794a56eb JL |
235 | /* |
236 | * !! For sched_setattr_nocheck() (kernel) only !! | |
237 | * | |
238 | * This is actually gross. :( | |
239 | * | |
240 | * It is used to make schedutil kworker(s) higher priority than SCHED_DEADLINE | |
241 | * tasks, but still be able to sleep. We need this on platforms that cannot | |
242 | * atomically change clock frequency. Remove once fast switching will be | |
243 | * available on such platforms. | |
244 | * | |
245 | * SUGOV stands for SchedUtil GOVernor. | |
246 | */ | |
247 | #define SCHED_FLAG_SUGOV 0x10000000 | |
248 | ||
f9509153 QP |
249 | #define SCHED_DL_FLAGS (SCHED_FLAG_RECLAIM | SCHED_FLAG_DL_OVERRUN | SCHED_FLAG_SUGOV) |
250 | ||
904cbab7 | 251 | static inline bool dl_entity_is_special(const struct sched_dl_entity *dl_se) |
794a56eb JL |
252 | { |
253 | #ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL | |
254 | return unlikely(dl_se->flags & SCHED_FLAG_SUGOV); | |
255 | #else | |
256 | return false; | |
257 | #endif | |
258 | } | |
259 | ||
2d3d891d DF |
260 | /* |
261 | * Tells if entity @a should preempt entity @b. | |
262 | */ | |
904cbab7 MWO |
263 | static inline bool dl_entity_preempt(const struct sched_dl_entity *a, |
264 | const struct sched_dl_entity *b) | |
2d3d891d | 265 | { |
794a56eb JL |
266 | return dl_entity_is_special(a) || |
267 | dl_time_before(a->deadline, b->deadline); | |
2d3d891d DF |
268 | } |
269 | ||
029632fb PZ |
270 | /* |
271 | * This is the priority-queue data structure of the RT scheduling class: | |
272 | */ | |
273 | struct rt_prio_array { | |
274 | DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */ | |
275 | struct list_head queue[MAX_RT_PRIO]; | |
276 | }; | |
277 | ||
278 | struct rt_bandwidth { | |
279 | /* nests inside the rq lock: */ | |
280 | raw_spinlock_t rt_runtime_lock; | |
281 | ktime_t rt_period; | |
282 | u64 rt_runtime; | |
283 | struct hrtimer rt_period_timer; | |
4cfafd30 | 284 | unsigned int rt_period_active; |
029632fb | 285 | }; |
a5e7be3b JL |
286 | |
287 | void __dl_clear_params(struct task_struct *p); | |
288 | ||
332ac17e DF |
289 | static inline int dl_bandwidth_enabled(void) |
290 | { | |
1724813d | 291 | return sysctl_sched_rt_runtime >= 0; |
332ac17e DF |
292 | } |
293 | ||
a57415f5 PL |
294 | /* |
295 | * To keep the bandwidth of -deadline tasks under control | |
296 | * we need some place where: | |
297 | * - store the maximum -deadline bandwidth of each cpu; | |
298 | * - cache the fraction of bandwidth that is currently allocated in | |
299 | * each root domain; | |
300 | * | |
301 | * This is all done in the data structure below. It is similar to the | |
302 | * one used for RT-throttling (rt_bandwidth), with the main difference | |
303 | * that, since here we are only interested in admission control, we | |
304 | * do not decrease any runtime while the group "executes", neither we | |
305 | * need a timer to replenish it. | |
306 | * | |
307 | * With respect to SMP, bandwidth is given on a per root domain basis, | |
308 | * meaning that: | |
309 | * - bw (< 100%) is the deadline bandwidth of each CPU; | |
310 | * - total_bw is the currently allocated bandwidth in each root domain; | |
311 | */ | |
332ac17e | 312 | struct dl_bw { |
97fb7a0a IM |
313 | raw_spinlock_t lock; |
314 | u64 bw; | |
315 | u64 total_bw; | |
332ac17e DF |
316 | }; |
317 | ||
f2cb1360 | 318 | extern void init_dl_bw(struct dl_bw *dl_b); |
97fb7a0a | 319 | extern int sched_dl_global_validate(void); |
06a76fe0 | 320 | extern void sched_dl_do_global(void); |
97fb7a0a | 321 | extern int sched_dl_overflow(struct task_struct *p, int policy, const struct sched_attr *attr); |
06a76fe0 NP |
322 | extern void __setparam_dl(struct task_struct *p, const struct sched_attr *attr); |
323 | extern void __getparam_dl(struct task_struct *p, struct sched_attr *attr); | |
324 | extern bool __checkparam_dl(const struct sched_attr *attr); | |
06a76fe0 | 325 | extern bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr); |
97fb7a0a | 326 | extern int dl_cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial); |
85989106 | 327 | extern int dl_bw_check_overflow(int cpu); |
029632fb PZ |
328 | |
329 | #ifdef CONFIG_CGROUP_SCHED | |
330 | ||
029632fb PZ |
331 | struct cfs_rq; |
332 | struct rt_rq; | |
333 | ||
35cf4e50 | 334 | extern struct list_head task_groups; |
029632fb PZ |
335 | |
336 | struct cfs_bandwidth { | |
337 | #ifdef CONFIG_CFS_BANDWIDTH | |
97fb7a0a IM |
338 | raw_spinlock_t lock; |
339 | ktime_t period; | |
340 | u64 quota; | |
341 | u64 runtime; | |
f4183717 | 342 | u64 burst; |
bcb1704a | 343 | u64 runtime_snap; |
97fb7a0a | 344 | s64 hierarchical_quota; |
97fb7a0a | 345 | |
66567fcb | 346 | u8 idle; |
347 | u8 period_active; | |
66567fcb | 348 | u8 slack_started; |
97fb7a0a IM |
349 | struct hrtimer period_timer; |
350 | struct hrtimer slack_timer; | |
351 | struct list_head throttled_cfs_rq; | |
352 | ||
353 | /* Statistics: */ | |
354 | int nr_periods; | |
355 | int nr_throttled; | |
bcb1704a | 356 | int nr_burst; |
97fb7a0a | 357 | u64 throttled_time; |
bcb1704a | 358 | u64 burst_time; |
029632fb PZ |
359 | #endif |
360 | }; | |
361 | ||
97fb7a0a | 362 | /* Task group related information */ |
029632fb PZ |
363 | struct task_group { |
364 | struct cgroup_subsys_state css; | |
365 | ||
366 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
97fb7a0a IM |
367 | /* schedulable entities of this group on each CPU */ |
368 | struct sched_entity **se; | |
369 | /* runqueue "owned" by this group on each CPU */ | |
370 | struct cfs_rq **cfs_rq; | |
371 | unsigned long shares; | |
029632fb | 372 | |
30400039 JD |
373 | /* A positive value indicates that this is a SCHED_IDLE group. */ |
374 | int idle; | |
375 | ||
fa6bddeb | 376 | #ifdef CONFIG_SMP |
b0367629 WL |
377 | /* |
378 | * load_avg can be heavily contended at clock tick time, so put | |
379 | * it in its own cacheline separated from the fields above which | |
380 | * will also be accessed at each tick. | |
381 | */ | |
97fb7a0a | 382 | atomic_long_t load_avg ____cacheline_aligned; |
029632fb | 383 | #endif |
fa6bddeb | 384 | #endif |
029632fb PZ |
385 | |
386 | #ifdef CONFIG_RT_GROUP_SCHED | |
97fb7a0a IM |
387 | struct sched_rt_entity **rt_se; |
388 | struct rt_rq **rt_rq; | |
029632fb | 389 | |
97fb7a0a | 390 | struct rt_bandwidth rt_bandwidth; |
029632fb PZ |
391 | #endif |
392 | ||
97fb7a0a IM |
393 | struct rcu_head rcu; |
394 | struct list_head list; | |
029632fb | 395 | |
97fb7a0a IM |
396 | struct task_group *parent; |
397 | struct list_head siblings; | |
398 | struct list_head children; | |
029632fb PZ |
399 | |
400 | #ifdef CONFIG_SCHED_AUTOGROUP | |
97fb7a0a | 401 | struct autogroup *autogroup; |
029632fb PZ |
402 | #endif |
403 | ||
97fb7a0a | 404 | struct cfs_bandwidth cfs_bandwidth; |
2480c093 PB |
405 | |
406 | #ifdef CONFIG_UCLAMP_TASK_GROUP | |
407 | /* The two decimal precision [%] value requested from user-space */ | |
408 | unsigned int uclamp_pct[UCLAMP_CNT]; | |
409 | /* Clamp values requested for a task group */ | |
410 | struct uclamp_se uclamp_req[UCLAMP_CNT]; | |
0b60ba2d PB |
411 | /* Effective clamp values used for a task group */ |
412 | struct uclamp_se uclamp[UCLAMP_CNT]; | |
2480c093 PB |
413 | #endif |
414 | ||
029632fb PZ |
415 | }; |
416 | ||
417 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
418 | #define ROOT_TASK_GROUP_LOAD NICE_0_LOAD | |
419 | ||
420 | /* | |
421 | * A weight of 0 or 1 can cause arithmetics problems. | |
422 | * A weight of a cfs_rq is the sum of weights of which entities | |
423 | * are queued on this cfs_rq, so a weight of a entity should not be | |
424 | * too large, so as the shares value of a task group. | |
425 | * (The default weight is 1024 - so there's no practical | |
426 | * limitation from this.) | |
427 | */ | |
97fb7a0a IM |
428 | #define MIN_SHARES (1UL << 1) |
429 | #define MAX_SHARES (1UL << 18) | |
029632fb PZ |
430 | #endif |
431 | ||
029632fb PZ |
432 | typedef int (*tg_visitor)(struct task_group *, void *); |
433 | ||
434 | extern int walk_tg_tree_from(struct task_group *from, | |
435 | tg_visitor down, tg_visitor up, void *data); | |
436 | ||
437 | /* | |
438 | * Iterate the full tree, calling @down when first entering a node and @up when | |
439 | * leaving it for the final time. | |
440 | * | |
441 | * Caller must hold rcu_lock or sufficient equivalent. | |
442 | */ | |
443 | static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data) | |
444 | { | |
445 | return walk_tg_tree_from(&root_task_group, down, up, data); | |
446 | } | |
447 | ||
448 | extern int tg_nop(struct task_group *tg, void *data); | |
449 | ||
450 | extern void free_fair_sched_group(struct task_group *tg); | |
451 | extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent); | |
8663e24d | 452 | extern void online_fair_sched_group(struct task_group *tg); |
6fe1f348 | 453 | extern void unregister_fair_sched_group(struct task_group *tg); |
029632fb PZ |
454 | extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq, |
455 | struct sched_entity *se, int cpu, | |
456 | struct sched_entity *parent); | |
c98c1827 | 457 | extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b, struct cfs_bandwidth *parent); |
029632fb PZ |
458 | |
459 | extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b); | |
77a4d1a1 | 460 | extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b); |
029632fb | 461 | extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq); |
88c56cfe | 462 | extern bool cfs_task_bw_constrained(struct task_struct *p); |
029632fb | 463 | |
029632fb PZ |
464 | extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq, |
465 | struct sched_rt_entity *rt_se, int cpu, | |
466 | struct sched_rt_entity *parent); | |
8887cd99 NP |
467 | extern int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us); |
468 | extern int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us); | |
469 | extern long sched_group_rt_runtime(struct task_group *tg); | |
470 | extern long sched_group_rt_period(struct task_group *tg); | |
471 | extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); | |
029632fb | 472 | |
25cc7da7 LZ |
473 | extern struct task_group *sched_create_group(struct task_group *parent); |
474 | extern void sched_online_group(struct task_group *tg, | |
475 | struct task_group *parent); | |
476 | extern void sched_destroy_group(struct task_group *tg); | |
b027789e | 477 | extern void sched_release_group(struct task_group *tg); |
25cc7da7 LZ |
478 | |
479 | extern void sched_move_task(struct task_struct *tsk); | |
480 | ||
481 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
482 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); | |
ad936d86 | 483 | |
30400039 JD |
484 | extern int sched_group_set_idle(struct task_group *tg, long idle); |
485 | ||
ad936d86 BP |
486 | #ifdef CONFIG_SMP |
487 | extern void set_task_rq_fair(struct sched_entity *se, | |
488 | struct cfs_rq *prev, struct cfs_rq *next); | |
489 | #else /* !CONFIG_SMP */ | |
490 | static inline void set_task_rq_fair(struct sched_entity *se, | |
491 | struct cfs_rq *prev, struct cfs_rq *next) { } | |
492 | #endif /* CONFIG_SMP */ | |
493 | #endif /* CONFIG_FAIR_GROUP_SCHED */ | |
25cc7da7 | 494 | |
029632fb PZ |
495 | #else /* CONFIG_CGROUP_SCHED */ |
496 | ||
497 | struct cfs_bandwidth { }; | |
88c56cfe | 498 | static inline bool cfs_task_bw_constrained(struct task_struct *p) { return false; } |
029632fb PZ |
499 | |
500 | #endif /* CONFIG_CGROUP_SCHED */ | |
501 | ||
87514b2c BD |
502 | extern void unregister_rt_sched_group(struct task_group *tg); |
503 | extern void free_rt_sched_group(struct task_group *tg); | |
504 | extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent); | |
505 | ||
d05b4305 VD |
506 | /* |
507 | * u64_u32_load/u64_u32_store | |
508 | * | |
509 | * Use a copy of a u64 value to protect against data race. This is only | |
510 | * applicable for 32-bits architectures. | |
511 | */ | |
512 | #ifdef CONFIG_64BIT | |
513 | # define u64_u32_load_copy(var, copy) var | |
514 | # define u64_u32_store_copy(var, copy, val) (var = val) | |
515 | #else | |
516 | # define u64_u32_load_copy(var, copy) \ | |
517 | ({ \ | |
518 | u64 __val, __val_copy; \ | |
519 | do { \ | |
520 | __val_copy = copy; \ | |
521 | /* \ | |
522 | * paired with u64_u32_store_copy(), ordering access \ | |
523 | * to var and copy. \ | |
524 | */ \ | |
525 | smp_rmb(); \ | |
526 | __val = var; \ | |
527 | } while (__val != __val_copy); \ | |
528 | __val; \ | |
529 | }) | |
530 | # define u64_u32_store_copy(var, copy, val) \ | |
531 | do { \ | |
532 | typeof(val) __val = (val); \ | |
533 | var = __val; \ | |
534 | /* \ | |
535 | * paired with u64_u32_load_copy(), ordering access to var and \ | |
536 | * copy. \ | |
537 | */ \ | |
538 | smp_wmb(); \ | |
539 | copy = __val; \ | |
540 | } while (0) | |
541 | #endif | |
542 | # define u64_u32_load(var) u64_u32_load_copy(var, var##_copy) | |
543 | # define u64_u32_store(var, val) u64_u32_store_copy(var, var##_copy, val) | |
544 | ||
029632fb PZ |
545 | /* CFS-related fields in a runqueue */ |
546 | struct cfs_rq { | |
97fb7a0a | 547 | struct load_weight load; |
97fb7a0a | 548 | unsigned int nr_running; |
43e9f7f2 | 549 | unsigned int h_nr_running; /* SCHED_{NORMAL,BATCH,IDLE} */ |
a480adde | 550 | unsigned int idle_nr_running; /* SCHED_IDLE */ |
43e9f7f2 | 551 | unsigned int idle_h_nr_running; /* SCHED_IDLE */ |
029632fb | 552 | |
af4cf404 PZ |
553 | s64 avg_vruntime; |
554 | u64 avg_load; | |
555 | ||
97fb7a0a IM |
556 | u64 exec_clock; |
557 | u64 min_vruntime; | |
c6047c2e JFG |
558 | #ifdef CONFIG_SCHED_CORE |
559 | unsigned int forceidle_seq; | |
560 | u64 min_vruntime_fi; | |
561 | #endif | |
562 | ||
029632fb | 563 | #ifndef CONFIG_64BIT |
97fb7a0a | 564 | u64 min_vruntime_copy; |
029632fb PZ |
565 | #endif |
566 | ||
97fb7a0a | 567 | struct rb_root_cached tasks_timeline; |
029632fb | 568 | |
029632fb PZ |
569 | /* |
570 | * 'curr' points to currently running entity on this cfs_rq. | |
571 | * It is set to NULL otherwise (i.e when none are currently running). | |
572 | */ | |
97fb7a0a IM |
573 | struct sched_entity *curr; |
574 | struct sched_entity *next; | |
029632fb PZ |
575 | |
576 | #ifdef CONFIG_SCHED_DEBUG | |
97fb7a0a | 577 | unsigned int nr_spread_over; |
029632fb PZ |
578 | #endif |
579 | ||
2dac754e PT |
580 | #ifdef CONFIG_SMP |
581 | /* | |
9d89c257 | 582 | * CFS load tracking |
2dac754e | 583 | */ |
97fb7a0a | 584 | struct sched_avg avg; |
2a2f5d4e | 585 | #ifndef CONFIG_64BIT |
d05b4305 | 586 | u64 last_update_time_copy; |
9d89c257 | 587 | #endif |
2a2f5d4e PZ |
588 | struct { |
589 | raw_spinlock_t lock ____cacheline_aligned; | |
590 | int nr; | |
591 | unsigned long load_avg; | |
592 | unsigned long util_avg; | |
9f683953 | 593 | unsigned long runnable_avg; |
2a2f5d4e | 594 | } removed; |
82958366 | 595 | |
9d89c257 | 596 | #ifdef CONFIG_FAIR_GROUP_SCHED |
97fb7a0a IM |
597 | unsigned long tg_load_avg_contrib; |
598 | long propagate; | |
599 | long prop_runnable_sum; | |
0e2d2aaa | 600 | |
82958366 PT |
601 | /* |
602 | * h_load = weight * f(tg) | |
603 | * | |
604 | * Where f(tg) is the recursive weight fraction assigned to | |
605 | * this group. | |
606 | */ | |
97fb7a0a IM |
607 | unsigned long h_load; |
608 | u64 last_h_load_update; | |
609 | struct sched_entity *h_load_next; | |
68520796 | 610 | #endif /* CONFIG_FAIR_GROUP_SCHED */ |
82958366 PT |
611 | #endif /* CONFIG_SMP */ |
612 | ||
029632fb | 613 | #ifdef CONFIG_FAIR_GROUP_SCHED |
97fb7a0a | 614 | struct rq *rq; /* CPU runqueue to which this cfs_rq is attached */ |
029632fb PZ |
615 | |
616 | /* | |
617 | * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in | |
618 | * a hierarchy). Non-leaf lrqs hold other higher schedulable entities | |
619 | * (like users, containers etc.) | |
620 | * | |
97fb7a0a IM |
621 | * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a CPU. |
622 | * This list is used during load balance. | |
029632fb | 623 | */ |
97fb7a0a IM |
624 | int on_list; |
625 | struct list_head leaf_cfs_rq_list; | |
626 | struct task_group *tg; /* group that "owns" this runqueue */ | |
029632fb | 627 | |
30400039 JD |
628 | /* Locally cached copy of our task_group's idle value */ |
629 | int idle; | |
630 | ||
029632fb | 631 | #ifdef CONFIG_CFS_BANDWIDTH |
97fb7a0a | 632 | int runtime_enabled; |
97fb7a0a IM |
633 | s64 runtime_remaining; |
634 | ||
e2f3e35f VD |
635 | u64 throttled_pelt_idle; |
636 | #ifndef CONFIG_64BIT | |
637 | u64 throttled_pelt_idle_copy; | |
638 | #endif | |
97fb7a0a | 639 | u64 throttled_clock; |
64eaf507 CZ |
640 | u64 throttled_clock_pelt; |
641 | u64 throttled_clock_pelt_time; | |
677ea015 JD |
642 | u64 throttled_clock_self; |
643 | u64 throttled_clock_self_time; | |
97fb7a0a IM |
644 | int throttled; |
645 | int throttle_count; | |
646 | struct list_head throttled_list; | |
8ad075c2 JD |
647 | #ifdef CONFIG_SMP |
648 | struct list_head throttled_csd_list; | |
649 | #endif | |
029632fb PZ |
650 | #endif /* CONFIG_CFS_BANDWIDTH */ |
651 | #endif /* CONFIG_FAIR_GROUP_SCHED */ | |
652 | }; | |
653 | ||
654 | static inline int rt_bandwidth_enabled(void) | |
655 | { | |
656 | return sysctl_sched_rt_runtime >= 0; | |
657 | } | |
658 | ||
b6366f04 | 659 | /* RT IPI pull logic requires IRQ_WORK */ |
4bdced5c | 660 | #if defined(CONFIG_IRQ_WORK) && defined(CONFIG_SMP) |
b6366f04 SR |
661 | # define HAVE_RT_PUSH_IPI |
662 | #endif | |
663 | ||
029632fb PZ |
664 | /* Real-Time classes' related field in a runqueue: */ |
665 | struct rt_rq { | |
97fb7a0a IM |
666 | struct rt_prio_array active; |
667 | unsigned int rt_nr_running; | |
668 | unsigned int rr_nr_running; | |
029632fb PZ |
669 | #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED |
670 | struct { | |
97fb7a0a | 671 | int curr; /* highest queued rt task prio */ |
029632fb | 672 | #ifdef CONFIG_SMP |
97fb7a0a | 673 | int next; /* next highest */ |
029632fb PZ |
674 | #endif |
675 | } highest_prio; | |
676 | #endif | |
677 | #ifdef CONFIG_SMP | |
e6fe3f42 AD |
678 | unsigned int rt_nr_migratory; |
679 | unsigned int rt_nr_total; | |
97fb7a0a IM |
680 | int overloaded; |
681 | struct plist_head pushable_tasks; | |
371bf427 | 682 | |
b6366f04 | 683 | #endif /* CONFIG_SMP */ |
97fb7a0a | 684 | int rt_queued; |
f4ebcbc0 | 685 | |
97fb7a0a IM |
686 | int rt_throttled; |
687 | u64 rt_time; | |
688 | u64 rt_runtime; | |
029632fb | 689 | /* Nests inside the rq lock: */ |
97fb7a0a | 690 | raw_spinlock_t rt_runtime_lock; |
029632fb PZ |
691 | |
692 | #ifdef CONFIG_RT_GROUP_SCHED | |
e6fe3f42 | 693 | unsigned int rt_nr_boosted; |
029632fb | 694 | |
97fb7a0a IM |
695 | struct rq *rq; |
696 | struct task_group *tg; | |
029632fb PZ |
697 | #endif |
698 | }; | |
699 | ||
296b2ffe VG |
700 | static inline bool rt_rq_is_runnable(struct rt_rq *rt_rq) |
701 | { | |
702 | return rt_rq->rt_queued && rt_rq->rt_nr_running; | |
703 | } | |
704 | ||
aab03e05 DF |
705 | /* Deadline class' related fields in a runqueue */ |
706 | struct dl_rq { | |
707 | /* runqueue is an rbtree, ordered by deadline */ | |
97fb7a0a | 708 | struct rb_root_cached root; |
aab03e05 | 709 | |
e6fe3f42 | 710 | unsigned int dl_nr_running; |
1baca4ce JL |
711 | |
712 | #ifdef CONFIG_SMP | |
713 | /* | |
714 | * Deadline values of the currently executing and the | |
715 | * earliest ready task on this rq. Caching these facilitates | |
dfcb245e | 716 | * the decision whether or not a ready but not running task |
1baca4ce JL |
717 | * should migrate somewhere else. |
718 | */ | |
719 | struct { | |
97fb7a0a IM |
720 | u64 curr; |
721 | u64 next; | |
1baca4ce JL |
722 | } earliest_dl; |
723 | ||
e6fe3f42 | 724 | unsigned int dl_nr_migratory; |
97fb7a0a | 725 | int overloaded; |
1baca4ce JL |
726 | |
727 | /* | |
728 | * Tasks on this rq that can be pushed away. They are kept in | |
729 | * an rb-tree, ordered by tasks' deadlines, with caching | |
730 | * of the leftmost (earliest deadline) element. | |
731 | */ | |
97fb7a0a | 732 | struct rb_root_cached pushable_dl_tasks_root; |
332ac17e | 733 | #else |
97fb7a0a | 734 | struct dl_bw dl_bw; |
1baca4ce | 735 | #endif |
e36d8677 LA |
736 | /* |
737 | * "Active utilization" for this runqueue: increased when a | |
738 | * task wakes up (becomes TASK_RUNNING) and decreased when a | |
739 | * task blocks | |
740 | */ | |
97fb7a0a | 741 | u64 running_bw; |
4da3abce | 742 | |
8fd27231 LA |
743 | /* |
744 | * Utilization of the tasks "assigned" to this runqueue (including | |
745 | * the tasks that are in runqueue and the tasks that executed on this | |
746 | * CPU and blocked). Increased when a task moves to this runqueue, and | |
747 | * decreased when the task moves away (migrates, changes scheduling | |
748 | * policy, or terminates). | |
749 | * This is needed to compute the "inactive utilization" for the | |
750 | * runqueue (inactive utilization = this_bw - running_bw). | |
751 | */ | |
97fb7a0a IM |
752 | u64 this_bw; |
753 | u64 extra_bw; | |
8fd27231 | 754 | |
6a9d623a VP |
755 | /* |
756 | * Maximum available bandwidth for reclaiming by SCHED_FLAG_RECLAIM | |
757 | * tasks of this rq. Used in calculation of reclaimable bandwidth(GRUB). | |
758 | */ | |
759 | u64 max_bw; | |
760 | ||
4da3abce LA |
761 | /* |
762 | * Inverse of the fraction of CPU utilization that can be reclaimed | |
763 | * by the GRUB algorithm. | |
764 | */ | |
97fb7a0a | 765 | u64 bw_ratio; |
aab03e05 DF |
766 | }; |
767 | ||
c0796298 VG |
768 | #ifdef CONFIG_FAIR_GROUP_SCHED |
769 | /* An entity is a task if it doesn't "own" a runqueue */ | |
770 | #define entity_is_task(se) (!se->my_q) | |
0dacee1b | 771 | |
9f683953 VG |
772 | static inline void se_update_runnable(struct sched_entity *se) |
773 | { | |
774 | if (!entity_is_task(se)) | |
775 | se->runnable_weight = se->my_q->h_nr_running; | |
776 | } | |
777 | ||
778 | static inline long se_runnable(struct sched_entity *se) | |
779 | { | |
780 | if (entity_is_task(se)) | |
781 | return !!se->on_rq; | |
782 | else | |
783 | return se->runnable_weight; | |
784 | } | |
785 | ||
c0796298 VG |
786 | #else |
787 | #define entity_is_task(se) 1 | |
0dacee1b | 788 | |
9f683953 VG |
789 | static inline void se_update_runnable(struct sched_entity *se) {} |
790 | ||
791 | static inline long se_runnable(struct sched_entity *se) | |
792 | { | |
793 | return !!se->on_rq; | |
794 | } | |
c0796298 VG |
795 | #endif |
796 | ||
029632fb | 797 | #ifdef CONFIG_SMP |
c0796298 VG |
798 | /* |
799 | * XXX we want to get rid of these helpers and use the full load resolution. | |
800 | */ | |
801 | static inline long se_weight(struct sched_entity *se) | |
802 | { | |
803 | return scale_load_down(se->load.weight); | |
804 | } | |
805 | ||
029632fb | 806 | |
afe06efd TC |
807 | static inline bool sched_asym_prefer(int a, int b) |
808 | { | |
809 | return arch_asym_cpu_priority(a) > arch_asym_cpu_priority(b); | |
810 | } | |
811 | ||
6aa140fa QP |
812 | struct perf_domain { |
813 | struct em_perf_domain *em_pd; | |
814 | struct perf_domain *next; | |
815 | struct rcu_head rcu; | |
816 | }; | |
817 | ||
630246a0 QP |
818 | /* Scheduling group status flags */ |
819 | #define SG_OVERLOAD 0x1 /* More than one runnable task on a CPU. */ | |
2802bf3c | 820 | #define SG_OVERUTILIZED 0x2 /* One or more CPUs are over-utilized. */ |
630246a0 | 821 | |
029632fb PZ |
822 | /* |
823 | * We add the notion of a root-domain which will be used to define per-domain | |
824 | * variables. Each exclusive cpuset essentially defines an island domain by | |
97fb7a0a | 825 | * fully partitioning the member CPUs from any other cpuset. Whenever a new |
029632fb PZ |
826 | * exclusive cpuset is created, we also create and attach a new root-domain |
827 | * object. | |
828 | * | |
829 | */ | |
830 | struct root_domain { | |
97fb7a0a IM |
831 | atomic_t refcount; |
832 | atomic_t rto_count; | |
833 | struct rcu_head rcu; | |
834 | cpumask_var_t span; | |
835 | cpumask_var_t online; | |
029632fb | 836 | |
757ffdd7 VS |
837 | /* |
838 | * Indicate pullable load on at least one CPU, e.g: | |
839 | * - More than one runnable task | |
840 | * - Running task is misfit | |
841 | */ | |
575638d1 | 842 | int overload; |
4486edd1 | 843 | |
2802bf3c MR |
844 | /* Indicate one or more cpus over-utilized (tipping point) */ |
845 | int overutilized; | |
846 | ||
1baca4ce JL |
847 | /* |
848 | * The bit corresponding to a CPU gets set here if such CPU has more | |
849 | * than one runnable -deadline task (as it is below for RT tasks). | |
850 | */ | |
97fb7a0a IM |
851 | cpumask_var_t dlo_mask; |
852 | atomic_t dlo_count; | |
853 | struct dl_bw dl_bw; | |
854 | struct cpudl cpudl; | |
1baca4ce | 855 | |
26762423 PL |
856 | /* |
857 | * Indicate whether a root_domain's dl_bw has been checked or | |
858 | * updated. It's monotonously increasing value. | |
859 | * | |
860 | * Also, some corner cases, like 'wrap around' is dangerous, but given | |
861 | * that u64 is 'big enough'. So that shouldn't be a concern. | |
862 | */ | |
863 | u64 visit_gen; | |
864 | ||
4bdced5c SRRH |
865 | #ifdef HAVE_RT_PUSH_IPI |
866 | /* | |
867 | * For IPI pull requests, loop across the rto_mask. | |
868 | */ | |
97fb7a0a IM |
869 | struct irq_work rto_push_work; |
870 | raw_spinlock_t rto_lock; | |
4bdced5c | 871 | /* These are only updated and read within rto_lock */ |
97fb7a0a IM |
872 | int rto_loop; |
873 | int rto_cpu; | |
4bdced5c | 874 | /* These atomics are updated outside of a lock */ |
97fb7a0a IM |
875 | atomic_t rto_loop_next; |
876 | atomic_t rto_loop_start; | |
4bdced5c | 877 | #endif |
029632fb PZ |
878 | /* |
879 | * The "RT overload" flag: it gets set if a CPU has more than | |
880 | * one runnable RT task. | |
881 | */ | |
97fb7a0a IM |
882 | cpumask_var_t rto_mask; |
883 | struct cpupri cpupri; | |
cd92bfd3 | 884 | |
97fb7a0a | 885 | unsigned long max_cpu_capacity; |
6aa140fa QP |
886 | |
887 | /* | |
888 | * NULL-terminated list of performance domains intersecting with the | |
889 | * CPUs of the rd. Protected by RCU. | |
890 | */ | |
7ba7319f | 891 | struct perf_domain __rcu *pd; |
029632fb PZ |
892 | }; |
893 | ||
f2cb1360 | 894 | extern void init_defrootdomain(void); |
8d5dc512 | 895 | extern int sched_init_domains(const struct cpumask *cpu_map); |
f2cb1360 | 896 | extern void rq_attach_root(struct rq *rq, struct root_domain *rd); |
364f5665 SRV |
897 | extern void sched_get_rd(struct root_domain *rd); |
898 | extern void sched_put_rd(struct root_domain *rd); | |
029632fb | 899 | |
4bdced5c SRRH |
900 | #ifdef HAVE_RT_PUSH_IPI |
901 | extern void rto_push_irq_work_func(struct irq_work *work); | |
902 | #endif | |
029632fb PZ |
903 | #endif /* CONFIG_SMP */ |
904 | ||
69842cba PB |
905 | #ifdef CONFIG_UCLAMP_TASK |
906 | /* | |
907 | * struct uclamp_bucket - Utilization clamp bucket | |
908 | * @value: utilization clamp value for tasks on this clamp bucket | |
909 | * @tasks: number of RUNNABLE tasks on this clamp bucket | |
910 | * | |
911 | * Keep track of how many tasks are RUNNABLE for a given utilization | |
912 | * clamp value. | |
913 | */ | |
914 | struct uclamp_bucket { | |
915 | unsigned long value : bits_per(SCHED_CAPACITY_SCALE); | |
916 | unsigned long tasks : BITS_PER_LONG - bits_per(SCHED_CAPACITY_SCALE); | |
917 | }; | |
918 | ||
919 | /* | |
920 | * struct uclamp_rq - rq's utilization clamp | |
921 | * @value: currently active clamp values for a rq | |
922 | * @bucket: utilization clamp buckets affecting a rq | |
923 | * | |
924 | * Keep track of RUNNABLE tasks on a rq to aggregate their clamp values. | |
925 | * A clamp value is affecting a rq when there is at least one task RUNNABLE | |
926 | * (or actually running) with that value. | |
927 | * | |
928 | * There are up to UCLAMP_CNT possible different clamp values, currently there | |
929 | * are only two: minimum utilization and maximum utilization. | |
930 | * | |
931 | * All utilization clamping values are MAX aggregated, since: | |
932 | * - for util_min: we want to run the CPU at least at the max of the minimum | |
933 | * utilization required by its currently RUNNABLE tasks. | |
934 | * - for util_max: we want to allow the CPU to run up to the max of the | |
935 | * maximum utilization allowed by its currently RUNNABLE tasks. | |
936 | * | |
937 | * Since on each system we expect only a limited number of different | |
938 | * utilization clamp values (UCLAMP_BUCKETS), use a simple array to track | |
939 | * the metrics required to compute all the per-rq utilization clamp values. | |
940 | */ | |
941 | struct uclamp_rq { | |
942 | unsigned int value; | |
943 | struct uclamp_bucket bucket[UCLAMP_BUCKETS]; | |
944 | }; | |
46609ce2 QY |
945 | |
946 | DECLARE_STATIC_KEY_FALSE(sched_uclamp_used); | |
69842cba PB |
947 | #endif /* CONFIG_UCLAMP_TASK */ |
948 | ||
8e5bad7d KC |
949 | struct rq; |
950 | struct balance_callback { | |
951 | struct balance_callback *next; | |
952 | void (*func)(struct rq *rq); | |
953 | }; | |
954 | ||
029632fb PZ |
955 | /* |
956 | * This is the main, per-CPU runqueue data structure. | |
957 | * | |
958 | * Locking rule: those places that want to lock multiple runqueues | |
959 | * (such as the load balancing or the thread migration code), lock | |
960 | * acquire operations must be ordered by ascending &runqueue. | |
961 | */ | |
962 | struct rq { | |
963 | /* runqueue lock: */ | |
5cb9eaa3 | 964 | raw_spinlock_t __lock; |
029632fb PZ |
965 | |
966 | /* | |
967 | * nr_running and cpu_load should be in the same cacheline because | |
968 | * remote CPUs use both these fields when doing load calculation. | |
969 | */ | |
97fb7a0a | 970 | unsigned int nr_running; |
0ec8aa00 | 971 | #ifdef CONFIG_NUMA_BALANCING |
97fb7a0a IM |
972 | unsigned int nr_numa_running; |
973 | unsigned int nr_preferred_running; | |
a4739eca | 974 | unsigned int numa_migrate_on; |
0ec8aa00 | 975 | #endif |
3451d024 | 976 | #ifdef CONFIG_NO_HZ_COMMON |
9fd81dd5 | 977 | #ifdef CONFIG_SMP |
e022e0d3 | 978 | unsigned long last_blocked_load_update_tick; |
f643ea22 | 979 | unsigned int has_blocked_load; |
90b5363a | 980 | call_single_data_t nohz_csd; |
9fd81dd5 | 981 | #endif /* CONFIG_SMP */ |
00357f5e | 982 | unsigned int nohz_tick_stopped; |
90b5363a | 983 | atomic_t nohz_flags; |
9fd81dd5 | 984 | #endif /* CONFIG_NO_HZ_COMMON */ |
dcdedb24 | 985 | |
126c2092 PZ |
986 | #ifdef CONFIG_SMP |
987 | unsigned int ttwu_pending; | |
988 | #endif | |
97fb7a0a | 989 | u64 nr_switches; |
029632fb | 990 | |
69842cba PB |
991 | #ifdef CONFIG_UCLAMP_TASK |
992 | /* Utilization clamp values based on CPU's RUNNABLE tasks */ | |
993 | struct uclamp_rq uclamp[UCLAMP_CNT] ____cacheline_aligned; | |
e496187d PB |
994 | unsigned int uclamp_flags; |
995 | #define UCLAMP_FLAG_IDLE 0x01 | |
69842cba PB |
996 | #endif |
997 | ||
97fb7a0a IM |
998 | struct cfs_rq cfs; |
999 | struct rt_rq rt; | |
1000 | struct dl_rq dl; | |
029632fb PZ |
1001 | |
1002 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
97fb7a0a IM |
1003 | /* list of leaf cfs_rq on this CPU: */ |
1004 | struct list_head leaf_cfs_rq_list; | |
1005 | struct list_head *tmp_alone_branch; | |
a35b6466 PZ |
1006 | #endif /* CONFIG_FAIR_GROUP_SCHED */ |
1007 | ||
029632fb PZ |
1008 | /* |
1009 | * This is part of a global counter where only the total sum | |
1010 | * over all CPUs matters. A task can increase this counter on | |
1011 | * one CPU and if it got migrated afterwards it may decrease | |
1012 | * it on another CPU. Always updated under the runqueue lock: | |
1013 | */ | |
e6fe3f42 | 1014 | unsigned int nr_uninterruptible; |
029632fb | 1015 | |
4104a562 | 1016 | struct task_struct __rcu *curr; |
97fb7a0a IM |
1017 | struct task_struct *idle; |
1018 | struct task_struct *stop; | |
1019 | unsigned long next_balance; | |
1020 | struct mm_struct *prev_mm; | |
029632fb | 1021 | |
97fb7a0a IM |
1022 | unsigned int clock_update_flags; |
1023 | u64 clock; | |
23127296 VG |
1024 | /* Ensure that all clocks are in the same cache line */ |
1025 | u64 clock_task ____cacheline_aligned; | |
1026 | u64 clock_pelt; | |
1027 | unsigned long lost_idle_time; | |
e2f3e35f VD |
1028 | u64 clock_pelt_idle; |
1029 | u64 clock_idle; | |
1030 | #ifndef CONFIG_64BIT | |
1031 | u64 clock_pelt_idle_copy; | |
1032 | u64 clock_idle_copy; | |
1033 | #endif | |
029632fb | 1034 | |
97fb7a0a | 1035 | atomic_t nr_iowait; |
029632fb | 1036 | |
c006fac5 PT |
1037 | #ifdef CONFIG_SCHED_DEBUG |
1038 | u64 last_seen_need_resched_ns; | |
1039 | int ticks_without_resched; | |
1040 | #endif | |
1041 | ||
227a4aad MD |
1042 | #ifdef CONFIG_MEMBARRIER |
1043 | int membarrier_state; | |
1044 | #endif | |
1045 | ||
029632fb | 1046 | #ifdef CONFIG_SMP |
994aeb7a JFG |
1047 | struct root_domain *rd; |
1048 | struct sched_domain __rcu *sd; | |
97fb7a0a IM |
1049 | |
1050 | unsigned long cpu_capacity; | |
1051 | unsigned long cpu_capacity_orig; | |
029632fb | 1052 | |
8e5bad7d | 1053 | struct balance_callback *balance_callback; |
029632fb | 1054 | |
19a1f5ec | 1055 | unsigned char nohz_idle_balance; |
97fb7a0a | 1056 | unsigned char idle_balance; |
e3fca9e7 | 1057 | |
3b1baa64 MR |
1058 | unsigned long misfit_task_load; |
1059 | ||
029632fb | 1060 | /* For active balancing */ |
97fb7a0a IM |
1061 | int active_balance; |
1062 | int push_cpu; | |
1063 | struct cpu_stop_work active_balance_work; | |
1064 | ||
1065 | /* CPU of this runqueue: */ | |
1066 | int cpu; | |
1067 | int online; | |
029632fb | 1068 | |
367456c7 PZ |
1069 | struct list_head cfs_tasks; |
1070 | ||
371bf427 | 1071 | struct sched_avg avg_rt; |
3727e0e1 | 1072 | struct sched_avg avg_dl; |
11d4afd4 | 1073 | #ifdef CONFIG_HAVE_SCHED_AVG_IRQ |
91c27493 | 1074 | struct sched_avg avg_irq; |
76504793 TG |
1075 | #endif |
1076 | #ifdef CONFIG_SCHED_THERMAL_PRESSURE | |
1077 | struct sched_avg avg_thermal; | |
91c27493 | 1078 | #endif |
97fb7a0a IM |
1079 | u64 idle_stamp; |
1080 | u64 avg_idle; | |
9bd721c5 | 1081 | |
94aafc3e PZ |
1082 | unsigned long wake_stamp; |
1083 | u64 wake_avg_idle; | |
1084 | ||
9bd721c5 | 1085 | /* This is used to determine avg_idle's max value */ |
97fb7a0a | 1086 | u64 max_idle_balance_cost; |
f2469a1f TG |
1087 | |
1088 | #ifdef CONFIG_HOTPLUG_CPU | |
1089 | struct rcuwait hotplug_wait; | |
1090 | #endif | |
90b5363a | 1091 | #endif /* CONFIG_SMP */ |
029632fb PZ |
1092 | |
1093 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING | |
97fb7a0a | 1094 | u64 prev_irq_time; |
029632fb PZ |
1095 | #endif |
1096 | #ifdef CONFIG_PARAVIRT | |
97fb7a0a | 1097 | u64 prev_steal_time; |
029632fb PZ |
1098 | #endif |
1099 | #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING | |
97fb7a0a | 1100 | u64 prev_steal_time_rq; |
029632fb PZ |
1101 | #endif |
1102 | ||
1103 | /* calc_load related fields */ | |
97fb7a0a IM |
1104 | unsigned long calc_load_update; |
1105 | long calc_load_active; | |
029632fb PZ |
1106 | |
1107 | #ifdef CONFIG_SCHED_HRTICK | |
1108 | #ifdef CONFIG_SMP | |
97fb7a0a | 1109 | call_single_data_t hrtick_csd; |
029632fb | 1110 | #endif |
97fb7a0a | 1111 | struct hrtimer hrtick_timer; |
156ec6f4 | 1112 | ktime_t hrtick_time; |
029632fb PZ |
1113 | #endif |
1114 | ||
1115 | #ifdef CONFIG_SCHEDSTATS | |
1116 | /* latency stats */ | |
97fb7a0a IM |
1117 | struct sched_info rq_sched_info; |
1118 | unsigned long long rq_cpu_time; | |
029632fb PZ |
1119 | /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */ |
1120 | ||
1121 | /* sys_sched_yield() stats */ | |
97fb7a0a | 1122 | unsigned int yld_count; |
029632fb PZ |
1123 | |
1124 | /* schedule() stats */ | |
97fb7a0a IM |
1125 | unsigned int sched_count; |
1126 | unsigned int sched_goidle; | |
029632fb PZ |
1127 | |
1128 | /* try_to_wake_up() stats */ | |
97fb7a0a IM |
1129 | unsigned int ttwu_count; |
1130 | unsigned int ttwu_local; | |
029632fb PZ |
1131 | #endif |
1132 | ||
442bf3aa DL |
1133 | #ifdef CONFIG_CPU_IDLE |
1134 | /* Must be inspected within a rcu lock section */ | |
97fb7a0a | 1135 | struct cpuidle_state *idle_state; |
442bf3aa | 1136 | #endif |
3015ef4b | 1137 | |
74d862b6 | 1138 | #ifdef CONFIG_SMP |
3015ef4b TG |
1139 | unsigned int nr_pinned; |
1140 | #endif | |
a7c81556 PZ |
1141 | unsigned int push_busy; |
1142 | struct cpu_stop_work push_work; | |
9edeaea1 PZ |
1143 | |
1144 | #ifdef CONFIG_SCHED_CORE | |
1145 | /* per rq */ | |
1146 | struct rq *core; | |
539f6512 | 1147 | struct task_struct *core_pick; |
9edeaea1 | 1148 | unsigned int core_enabled; |
539f6512 | 1149 | unsigned int core_sched_seq; |
8a311c74 PZ |
1150 | struct rb_root core_tree; |
1151 | ||
3c474b32 | 1152 | /* shared state -- careful with sched_core_cpu_deactivate() */ |
8a311c74 | 1153 | unsigned int core_task_seq; |
539f6512 PZ |
1154 | unsigned int core_pick_seq; |
1155 | unsigned long core_cookie; | |
4feee7d1 | 1156 | unsigned int core_forceidle_count; |
c6047c2e | 1157 | unsigned int core_forceidle_seq; |
4feee7d1 JD |
1158 | unsigned int core_forceidle_occupation; |
1159 | u64 core_forceidle_start; | |
9edeaea1 | 1160 | #endif |
da019032 WL |
1161 | |
1162 | /* Scratch cpumask to be temporarily used under rq_lock */ | |
1163 | cpumask_var_t scratch_mask; | |
8ad075c2 JD |
1164 | |
1165 | #if defined(CONFIG_CFS_BANDWIDTH) && defined(CONFIG_SMP) | |
1166 | call_single_data_t cfsb_csd; | |
1167 | struct list_head cfsb_csd_list; | |
1168 | #endif | |
029632fb PZ |
1169 | }; |
1170 | ||
62478d99 VG |
1171 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1172 | ||
1173 | /* CPU runqueue to which this cfs_rq is attached */ | |
1174 | static inline struct rq *rq_of(struct cfs_rq *cfs_rq) | |
1175 | { | |
1176 | return cfs_rq->rq; | |
1177 | } | |
1178 | ||
1179 | #else | |
1180 | ||
1181 | static inline struct rq *rq_of(struct cfs_rq *cfs_rq) | |
1182 | { | |
1183 | return container_of(cfs_rq, struct rq, cfs); | |
1184 | } | |
1185 | #endif | |
1186 | ||
029632fb PZ |
1187 | static inline int cpu_of(struct rq *rq) |
1188 | { | |
1189 | #ifdef CONFIG_SMP | |
1190 | return rq->cpu; | |
1191 | #else | |
1192 | return 0; | |
1193 | #endif | |
1194 | } | |
1195 | ||
a7c81556 PZ |
1196 | #define MDF_PUSH 0x01 |
1197 | ||
1198 | static inline bool is_migration_disabled(struct task_struct *p) | |
1199 | { | |
74d862b6 | 1200 | #ifdef CONFIG_SMP |
a7c81556 PZ |
1201 | return p->migration_disabled; |
1202 | #else | |
1203 | return false; | |
1204 | #endif | |
1205 | } | |
1b568f0a | 1206 | |
e705968d LS |
1207 | DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); |
1208 | ||
1209 | #define cpu_rq(cpu) (&per_cpu(runqueues, (cpu))) | |
1210 | #define this_rq() this_cpu_ptr(&runqueues) | |
1211 | #define task_rq(p) cpu_rq(task_cpu(p)) | |
1212 | #define cpu_curr(cpu) (cpu_rq(cpu)->curr) | |
1213 | #define raw_rq() raw_cpu_ptr(&runqueues) | |
1214 | ||
97886d9d | 1215 | struct sched_group; |
9edeaea1 | 1216 | #ifdef CONFIG_SCHED_CORE |
97886d9d | 1217 | static inline struct cpumask *sched_group_span(struct sched_group *sg); |
9edeaea1 PZ |
1218 | |
1219 | DECLARE_STATIC_KEY_FALSE(__sched_core_enabled); | |
1220 | ||
1221 | static inline bool sched_core_enabled(struct rq *rq) | |
1222 | { | |
1223 | return static_branch_unlikely(&__sched_core_enabled) && rq->core_enabled; | |
1224 | } | |
1225 | ||
1226 | static inline bool sched_core_disabled(void) | |
1227 | { | |
1228 | return !static_branch_unlikely(&__sched_core_enabled); | |
1229 | } | |
1230 | ||
9ef7e7e3 PZ |
1231 | /* |
1232 | * Be careful with this function; not for general use. The return value isn't | |
1233 | * stable unless you actually hold a relevant rq->__lock. | |
1234 | */ | |
9edeaea1 PZ |
1235 | static inline raw_spinlock_t *rq_lockp(struct rq *rq) |
1236 | { | |
1237 | if (sched_core_enabled(rq)) | |
1238 | return &rq->core->__lock; | |
1239 | ||
1240 | return &rq->__lock; | |
1241 | } | |
1242 | ||
9ef7e7e3 PZ |
1243 | static inline raw_spinlock_t *__rq_lockp(struct rq *rq) |
1244 | { | |
1245 | if (rq->core_enabled) | |
1246 | return &rq->core->__lock; | |
1247 | ||
1248 | return &rq->__lock; | |
1249 | } | |
1250 | ||
904cbab7 MWO |
1251 | bool cfs_prio_less(const struct task_struct *a, const struct task_struct *b, |
1252 | bool fi); | |
22dc02f8 | 1253 | void task_vruntime_update(struct rq *rq, struct task_struct *p, bool in_fi); |
c6047c2e | 1254 | |
97886d9d AL |
1255 | /* |
1256 | * Helpers to check if the CPU's core cookie matches with the task's cookie | |
1257 | * when core scheduling is enabled. | |
1258 | * A special case is that the task's cookie always matches with CPU's core | |
1259 | * cookie if the CPU is in an idle core. | |
1260 | */ | |
1261 | static inline bool sched_cpu_cookie_match(struct rq *rq, struct task_struct *p) | |
1262 | { | |
1263 | /* Ignore cookie match if core scheduler is not enabled on the CPU. */ | |
1264 | if (!sched_core_enabled(rq)) | |
1265 | return true; | |
1266 | ||
1267 | return rq->core->core_cookie == p->core_cookie; | |
1268 | } | |
1269 | ||
1270 | static inline bool sched_core_cookie_match(struct rq *rq, struct task_struct *p) | |
1271 | { | |
1272 | bool idle_core = true; | |
1273 | int cpu; | |
1274 | ||
1275 | /* Ignore cookie match if core scheduler is not enabled on the CPU. */ | |
1276 | if (!sched_core_enabled(rq)) | |
1277 | return true; | |
1278 | ||
1279 | for_each_cpu(cpu, cpu_smt_mask(cpu_of(rq))) { | |
1280 | if (!available_idle_cpu(cpu)) { | |
1281 | idle_core = false; | |
1282 | break; | |
1283 | } | |
1284 | } | |
1285 | ||
1286 | /* | |
1287 | * A CPU in an idle core is always the best choice for tasks with | |
1288 | * cookies. | |
1289 | */ | |
1290 | return idle_core || rq->core->core_cookie == p->core_cookie; | |
1291 | } | |
1292 | ||
1293 | static inline bool sched_group_cookie_match(struct rq *rq, | |
1294 | struct task_struct *p, | |
1295 | struct sched_group *group) | |
1296 | { | |
1297 | int cpu; | |
1298 | ||
1299 | /* Ignore cookie match if core scheduler is not enabled on the CPU. */ | |
1300 | if (!sched_core_enabled(rq)) | |
1301 | return true; | |
1302 | ||
1303 | for_each_cpu_and(cpu, sched_group_span(group), p->cpus_ptr) { | |
e705968d | 1304 | if (sched_core_cookie_match(cpu_rq(cpu), p)) |
97886d9d AL |
1305 | return true; |
1306 | } | |
1307 | return false; | |
1308 | } | |
1309 | ||
6e33cad0 PZ |
1310 | static inline bool sched_core_enqueued(struct task_struct *p) |
1311 | { | |
1312 | return !RB_EMPTY_NODE(&p->core_node); | |
1313 | } | |
1314 | ||
1315 | extern void sched_core_enqueue(struct rq *rq, struct task_struct *p); | |
4feee7d1 | 1316 | extern void sched_core_dequeue(struct rq *rq, struct task_struct *p, int flags); |
6e33cad0 PZ |
1317 | |
1318 | extern void sched_core_get(void); | |
1319 | extern void sched_core_put(void); | |
1320 | ||
9edeaea1 PZ |
1321 | #else /* !CONFIG_SCHED_CORE */ |
1322 | ||
1323 | static inline bool sched_core_enabled(struct rq *rq) | |
1324 | { | |
1325 | return false; | |
1326 | } | |
1327 | ||
d66f1b06 PZ |
1328 | static inline bool sched_core_disabled(void) |
1329 | { | |
1330 | return true; | |
1331 | } | |
1332 | ||
39d371b7 PZ |
1333 | static inline raw_spinlock_t *rq_lockp(struct rq *rq) |
1334 | { | |
5cb9eaa3 | 1335 | return &rq->__lock; |
39d371b7 PZ |
1336 | } |
1337 | ||
9ef7e7e3 PZ |
1338 | static inline raw_spinlock_t *__rq_lockp(struct rq *rq) |
1339 | { | |
1340 | return &rq->__lock; | |
1341 | } | |
1342 | ||
97886d9d AL |
1343 | static inline bool sched_cpu_cookie_match(struct rq *rq, struct task_struct *p) |
1344 | { | |
1345 | return true; | |
1346 | } | |
1347 | ||
1348 | static inline bool sched_core_cookie_match(struct rq *rq, struct task_struct *p) | |
1349 | { | |
1350 | return true; | |
1351 | } | |
1352 | ||
1353 | static inline bool sched_group_cookie_match(struct rq *rq, | |
1354 | struct task_struct *p, | |
1355 | struct sched_group *group) | |
1356 | { | |
1357 | return true; | |
1358 | } | |
9edeaea1 PZ |
1359 | #endif /* CONFIG_SCHED_CORE */ |
1360 | ||
39d371b7 PZ |
1361 | static inline void lockdep_assert_rq_held(struct rq *rq) |
1362 | { | |
9ef7e7e3 | 1363 | lockdep_assert_held(__rq_lockp(rq)); |
39d371b7 PZ |
1364 | } |
1365 | ||
1366 | extern void raw_spin_rq_lock_nested(struct rq *rq, int subclass); | |
1367 | extern bool raw_spin_rq_trylock(struct rq *rq); | |
1368 | extern void raw_spin_rq_unlock(struct rq *rq); | |
1369 | ||
1370 | static inline void raw_spin_rq_lock(struct rq *rq) | |
1371 | { | |
1372 | raw_spin_rq_lock_nested(rq, 0); | |
1373 | } | |
1374 | ||
1375 | static inline void raw_spin_rq_lock_irq(struct rq *rq) | |
1376 | { | |
1377 | local_irq_disable(); | |
1378 | raw_spin_rq_lock(rq); | |
1379 | } | |
1380 | ||
1381 | static inline void raw_spin_rq_unlock_irq(struct rq *rq) | |
1382 | { | |
1383 | raw_spin_rq_unlock(rq); | |
1384 | local_irq_enable(); | |
1385 | } | |
1386 | ||
1387 | static inline unsigned long _raw_spin_rq_lock_irqsave(struct rq *rq) | |
1388 | { | |
1389 | unsigned long flags; | |
1390 | local_irq_save(flags); | |
1391 | raw_spin_rq_lock(rq); | |
1392 | return flags; | |
1393 | } | |
1394 | ||
1395 | static inline void raw_spin_rq_unlock_irqrestore(struct rq *rq, unsigned long flags) | |
1396 | { | |
1397 | raw_spin_rq_unlock(rq); | |
1398 | local_irq_restore(flags); | |
1399 | } | |
1400 | ||
1401 | #define raw_spin_rq_lock_irqsave(rq, flags) \ | |
1402 | do { \ | |
1403 | flags = _raw_spin_rq_lock_irqsave(rq); \ | |
1404 | } while (0) | |
1405 | ||
1b568f0a | 1406 | #ifdef CONFIG_SCHED_SMT |
1b568f0a PZ |
1407 | extern void __update_idle_core(struct rq *rq); |
1408 | ||
1409 | static inline void update_idle_core(struct rq *rq) | |
1410 | { | |
1411 | if (static_branch_unlikely(&sched_smt_present)) | |
1412 | __update_idle_core(rq); | |
1413 | } | |
1414 | ||
1415 | #else | |
1416 | static inline void update_idle_core(struct rq *rq) { } | |
1417 | #endif | |
1418 | ||
8a311c74 PZ |
1419 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1420 | static inline struct task_struct *task_of(struct sched_entity *se) | |
1421 | { | |
1422 | SCHED_WARN_ON(!entity_is_task(se)); | |
1423 | return container_of(se, struct task_struct, se); | |
1424 | } | |
1425 | ||
1426 | static inline struct cfs_rq *task_cfs_rq(struct task_struct *p) | |
1427 | { | |
1428 | return p->se.cfs_rq; | |
1429 | } | |
1430 | ||
1431 | /* runqueue on which this entity is (to be) queued */ | |
904cbab7 | 1432 | static inline struct cfs_rq *cfs_rq_of(const struct sched_entity *se) |
8a311c74 PZ |
1433 | { |
1434 | return se->cfs_rq; | |
1435 | } | |
1436 | ||
1437 | /* runqueue "owned" by this group */ | |
1438 | static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp) | |
1439 | { | |
1440 | return grp->my_q; | |
1441 | } | |
1442 | ||
1443 | #else | |
1444 | ||
904cbab7 | 1445 | #define task_of(_se) container_of(_se, struct task_struct, se) |
8a311c74 | 1446 | |
904cbab7 | 1447 | static inline struct cfs_rq *task_cfs_rq(const struct task_struct *p) |
8a311c74 PZ |
1448 | { |
1449 | return &task_rq(p)->cfs; | |
1450 | } | |
1451 | ||
904cbab7 | 1452 | static inline struct cfs_rq *cfs_rq_of(const struct sched_entity *se) |
8a311c74 | 1453 | { |
904cbab7 | 1454 | const struct task_struct *p = task_of(se); |
8a311c74 PZ |
1455 | struct rq *rq = task_rq(p); |
1456 | ||
1457 | return &rq->cfs; | |
1458 | } | |
1459 | ||
1460 | /* runqueue "owned" by this group */ | |
1461 | static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp) | |
1462 | { | |
1463 | return NULL; | |
1464 | } | |
1465 | #endif | |
1466 | ||
1f351d7f JW |
1467 | extern void update_rq_clock(struct rq *rq); |
1468 | ||
cb42c9a3 MF |
1469 | /* |
1470 | * rq::clock_update_flags bits | |
1471 | * | |
1472 | * %RQCF_REQ_SKIP - will request skipping of clock update on the next | |
1473 | * call to __schedule(). This is an optimisation to avoid | |
1474 | * neighbouring rq clock updates. | |
1475 | * | |
1476 | * %RQCF_ACT_SKIP - is set from inside of __schedule() when skipping is | |
1477 | * in effect and calls to update_rq_clock() are being ignored. | |
1478 | * | |
1479 | * %RQCF_UPDATED - is a debug flag that indicates whether a call has been | |
1480 | * made to update_rq_clock() since the last time rq::lock was pinned. | |
1481 | * | |
1482 | * If inside of __schedule(), clock_update_flags will have been | |
1483 | * shifted left (a left shift is a cheap operation for the fast path | |
1484 | * to promote %RQCF_REQ_SKIP to %RQCF_ACT_SKIP), so you must use, | |
1485 | * | |
1486 | * if (rq-clock_update_flags >= RQCF_UPDATED) | |
1487 | * | |
3b03706f | 1488 | * to check if %RQCF_UPDATED is set. It'll never be shifted more than |
cb42c9a3 MF |
1489 | * one position though, because the next rq_unpin_lock() will shift it |
1490 | * back. | |
1491 | */ | |
97fb7a0a IM |
1492 | #define RQCF_REQ_SKIP 0x01 |
1493 | #define RQCF_ACT_SKIP 0x02 | |
1494 | #define RQCF_UPDATED 0x04 | |
cb42c9a3 MF |
1495 | |
1496 | static inline void assert_clock_updated(struct rq *rq) | |
1497 | { | |
1498 | /* | |
1499 | * The only reason for not seeing a clock update since the | |
1500 | * last rq_pin_lock() is if we're currently skipping updates. | |
1501 | */ | |
1502 | SCHED_WARN_ON(rq->clock_update_flags < RQCF_ACT_SKIP); | |
1503 | } | |
1504 | ||
78becc27 FW |
1505 | static inline u64 rq_clock(struct rq *rq) |
1506 | { | |
5cb9eaa3 | 1507 | lockdep_assert_rq_held(rq); |
cb42c9a3 MF |
1508 | assert_clock_updated(rq); |
1509 | ||
78becc27 FW |
1510 | return rq->clock; |
1511 | } | |
1512 | ||
1513 | static inline u64 rq_clock_task(struct rq *rq) | |
1514 | { | |
5cb9eaa3 | 1515 | lockdep_assert_rq_held(rq); |
cb42c9a3 MF |
1516 | assert_clock_updated(rq); |
1517 | ||
78becc27 FW |
1518 | return rq->clock_task; |
1519 | } | |
1520 | ||
05289b90 TG |
1521 | /** |
1522 | * By default the decay is the default pelt decay period. | |
1523 | * The decay shift can change the decay period in | |
1524 | * multiples of 32. | |
1525 | * Decay shift Decay period(ms) | |
1526 | * 0 32 | |
1527 | * 1 64 | |
1528 | * 2 128 | |
1529 | * 3 256 | |
1530 | * 4 512 | |
1531 | */ | |
1532 | extern int sched_thermal_decay_shift; | |
1533 | ||
1534 | static inline u64 rq_clock_thermal(struct rq *rq) | |
1535 | { | |
1536 | return rq_clock_task(rq) >> sched_thermal_decay_shift; | |
1537 | } | |
1538 | ||
adcc8da8 | 1539 | static inline void rq_clock_skip_update(struct rq *rq) |
9edfbfed | 1540 | { |
5cb9eaa3 | 1541 | lockdep_assert_rq_held(rq); |
adcc8da8 DB |
1542 | rq->clock_update_flags |= RQCF_REQ_SKIP; |
1543 | } | |
1544 | ||
1545 | /* | |
595058b6 | 1546 | * See rt task throttling, which is the only time a skip |
3b03706f | 1547 | * request is canceled. |
adcc8da8 DB |
1548 | */ |
1549 | static inline void rq_clock_cancel_skipupdate(struct rq *rq) | |
1550 | { | |
5cb9eaa3 | 1551 | lockdep_assert_rq_held(rq); |
adcc8da8 | 1552 | rq->clock_update_flags &= ~RQCF_REQ_SKIP; |
9edfbfed PZ |
1553 | } |
1554 | ||
ebb83d84 HJ |
1555 | /* |
1556 | * During cpu offlining and rq wide unthrottling, we can trigger | |
1557 | * an update_rq_clock() for several cfs and rt runqueues (Typically | |
1558 | * when using list_for_each_entry_*) | |
1559 | * rq_clock_start_loop_update() can be called after updating the clock | |
1560 | * once and before iterating over the list to prevent multiple update. | |
1561 | * After the iterative traversal, we need to call rq_clock_stop_loop_update() | |
1562 | * to clear RQCF_ACT_SKIP of rq->clock_update_flags. | |
1563 | */ | |
1564 | static inline void rq_clock_start_loop_update(struct rq *rq) | |
1565 | { | |
1566 | lockdep_assert_rq_held(rq); | |
1567 | SCHED_WARN_ON(rq->clock_update_flags & RQCF_ACT_SKIP); | |
1568 | rq->clock_update_flags |= RQCF_ACT_SKIP; | |
1569 | } | |
1570 | ||
1571 | static inline void rq_clock_stop_loop_update(struct rq *rq) | |
1572 | { | |
1573 | lockdep_assert_rq_held(rq); | |
1574 | rq->clock_update_flags &= ~RQCF_ACT_SKIP; | |
1575 | } | |
1576 | ||
d8ac8971 MF |
1577 | struct rq_flags { |
1578 | unsigned long flags; | |
1579 | struct pin_cookie cookie; | |
cb42c9a3 MF |
1580 | #ifdef CONFIG_SCHED_DEBUG |
1581 | /* | |
1582 | * A copy of (rq::clock_update_flags & RQCF_UPDATED) for the | |
1583 | * current pin context is stashed here in case it needs to be | |
1584 | * restored in rq_repin_lock(). | |
1585 | */ | |
1586 | unsigned int clock_update_flags; | |
1587 | #endif | |
d8ac8971 MF |
1588 | }; |
1589 | ||
8e5bad7d | 1590 | extern struct balance_callback balance_push_callback; |
ae792702 | 1591 | |
58877d34 PZ |
1592 | /* |
1593 | * Lockdep annotation that avoids accidental unlocks; it's like a | |
1594 | * sticky/continuous lockdep_assert_held(). | |
1595 | * | |
1596 | * This avoids code that has access to 'struct rq *rq' (basically everything in | |
1597 | * the scheduler) from accidentally unlocking the rq if they do not also have a | |
1598 | * copy of the (on-stack) 'struct rq_flags rf'. | |
1599 | * | |
1600 | * Also see Documentation/locking/lockdep-design.rst. | |
1601 | */ | |
d8ac8971 MF |
1602 | static inline void rq_pin_lock(struct rq *rq, struct rq_flags *rf) |
1603 | { | |
9ef7e7e3 | 1604 | rf->cookie = lockdep_pin_lock(__rq_lockp(rq)); |
cb42c9a3 MF |
1605 | |
1606 | #ifdef CONFIG_SCHED_DEBUG | |
1607 | rq->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP); | |
1608 | rf->clock_update_flags = 0; | |
565790d2 | 1609 | #ifdef CONFIG_SMP |
ae792702 PZ |
1610 | SCHED_WARN_ON(rq->balance_callback && rq->balance_callback != &balance_push_callback); |
1611 | #endif | |
565790d2 | 1612 | #endif |
d8ac8971 MF |
1613 | } |
1614 | ||
1615 | static inline void rq_unpin_lock(struct rq *rq, struct rq_flags *rf) | |
1616 | { | |
cb42c9a3 MF |
1617 | #ifdef CONFIG_SCHED_DEBUG |
1618 | if (rq->clock_update_flags > RQCF_ACT_SKIP) | |
1619 | rf->clock_update_flags = RQCF_UPDATED; | |
1620 | #endif | |
1621 | ||
9ef7e7e3 | 1622 | lockdep_unpin_lock(__rq_lockp(rq), rf->cookie); |
d8ac8971 MF |
1623 | } |
1624 | ||
1625 | static inline void rq_repin_lock(struct rq *rq, struct rq_flags *rf) | |
1626 | { | |
9ef7e7e3 | 1627 | lockdep_repin_lock(__rq_lockp(rq), rf->cookie); |
cb42c9a3 MF |
1628 | |
1629 | #ifdef CONFIG_SCHED_DEBUG | |
1630 | /* | |
1631 | * Restore the value we stashed in @rf for this pin context. | |
1632 | */ | |
1633 | rq->clock_update_flags |= rf->clock_update_flags; | |
1634 | #endif | |
d8ac8971 MF |
1635 | } |
1636 | ||
1f351d7f JW |
1637 | struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf) |
1638 | __acquires(rq->lock); | |
1639 | ||
1640 | struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf) | |
1641 | __acquires(p->pi_lock) | |
1642 | __acquires(rq->lock); | |
1643 | ||
1644 | static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf) | |
1645 | __releases(rq->lock) | |
1646 | { | |
1647 | rq_unpin_lock(rq, rf); | |
5cb9eaa3 | 1648 | raw_spin_rq_unlock(rq); |
1f351d7f JW |
1649 | } |
1650 | ||
1651 | static inline void | |
1652 | task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf) | |
1653 | __releases(rq->lock) | |
1654 | __releases(p->pi_lock) | |
1655 | { | |
1656 | rq_unpin_lock(rq, rf); | |
5cb9eaa3 | 1657 | raw_spin_rq_unlock(rq); |
1f351d7f JW |
1658 | raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags); |
1659 | } | |
1660 | ||
1661 | static inline void | |
1662 | rq_lock_irqsave(struct rq *rq, struct rq_flags *rf) | |
1663 | __acquires(rq->lock) | |
1664 | { | |
5cb9eaa3 | 1665 | raw_spin_rq_lock_irqsave(rq, rf->flags); |
1f351d7f JW |
1666 | rq_pin_lock(rq, rf); |
1667 | } | |
1668 | ||
1669 | static inline void | |
1670 | rq_lock_irq(struct rq *rq, struct rq_flags *rf) | |
1671 | __acquires(rq->lock) | |
1672 | { | |
5cb9eaa3 | 1673 | raw_spin_rq_lock_irq(rq); |
1f351d7f JW |
1674 | rq_pin_lock(rq, rf); |
1675 | } | |
1676 | ||
1677 | static inline void | |
1678 | rq_lock(struct rq *rq, struct rq_flags *rf) | |
1679 | __acquires(rq->lock) | |
1680 | { | |
5cb9eaa3 | 1681 | raw_spin_rq_lock(rq); |
1f351d7f JW |
1682 | rq_pin_lock(rq, rf); |
1683 | } | |
1684 | ||
1f351d7f JW |
1685 | static inline void |
1686 | rq_unlock_irqrestore(struct rq *rq, struct rq_flags *rf) | |
1687 | __releases(rq->lock) | |
1688 | { | |
1689 | rq_unpin_lock(rq, rf); | |
5cb9eaa3 | 1690 | raw_spin_rq_unlock_irqrestore(rq, rf->flags); |
1f351d7f JW |
1691 | } |
1692 | ||
1693 | static inline void | |
1694 | rq_unlock_irq(struct rq *rq, struct rq_flags *rf) | |
1695 | __releases(rq->lock) | |
1696 | { | |
1697 | rq_unpin_lock(rq, rf); | |
5cb9eaa3 | 1698 | raw_spin_rq_unlock_irq(rq); |
1f351d7f JW |
1699 | } |
1700 | ||
1701 | static inline void | |
1702 | rq_unlock(struct rq *rq, struct rq_flags *rf) | |
1703 | __releases(rq->lock) | |
1704 | { | |
1705 | rq_unpin_lock(rq, rf); | |
5cb9eaa3 | 1706 | raw_spin_rq_unlock(rq); |
1f351d7f JW |
1707 | } |
1708 | ||
4eb054f9 PZ |
1709 | DEFINE_LOCK_GUARD_1(rq_lock, struct rq, |
1710 | rq_lock(_T->lock, &_T->rf), | |
1711 | rq_unlock(_T->lock, &_T->rf), | |
1712 | struct rq_flags rf) | |
1713 | ||
1714 | DEFINE_LOCK_GUARD_1(rq_lock_irq, struct rq, | |
1715 | rq_lock_irq(_T->lock, &_T->rf), | |
1716 | rq_unlock_irq(_T->lock, &_T->rf), | |
1717 | struct rq_flags rf) | |
1718 | ||
1719 | DEFINE_LOCK_GUARD_1(rq_lock_irqsave, struct rq, | |
1720 | rq_lock_irqsave(_T->lock, &_T->rf), | |
1721 | rq_unlock_irqrestore(_T->lock, &_T->rf), | |
1722 | struct rq_flags rf) | |
1723 | ||
246b3b33 JW |
1724 | static inline struct rq * |
1725 | this_rq_lock_irq(struct rq_flags *rf) | |
1726 | __acquires(rq->lock) | |
1727 | { | |
1728 | struct rq *rq; | |
1729 | ||
1730 | local_irq_disable(); | |
1731 | rq = this_rq(); | |
1732 | rq_lock(rq, rf); | |
1733 | return rq; | |
1734 | } | |
1735 | ||
9942f79b | 1736 | #ifdef CONFIG_NUMA |
e3fe70b1 RR |
1737 | enum numa_topology_type { |
1738 | NUMA_DIRECT, | |
1739 | NUMA_GLUELESS_MESH, | |
1740 | NUMA_BACKPLANE, | |
1741 | }; | |
1742 | extern enum numa_topology_type sched_numa_topology_type; | |
9942f79b RR |
1743 | extern int sched_max_numa_distance; |
1744 | extern bool find_numa_distance(int distance); | |
0fb3978b HY |
1745 | extern void sched_init_numa(int offline_node); |
1746 | extern void sched_update_numa(int cpu, bool online); | |
f2cb1360 IM |
1747 | extern void sched_domains_numa_masks_set(unsigned int cpu); |
1748 | extern void sched_domains_numa_masks_clear(unsigned int cpu); | |
e0e8d491 | 1749 | extern int sched_numa_find_closest(const struct cpumask *cpus, int cpu); |
f2cb1360 | 1750 | #else |
0fb3978b HY |
1751 | static inline void sched_init_numa(int offline_node) { } |
1752 | static inline void sched_update_numa(int cpu, bool online) { } | |
f2cb1360 IM |
1753 | static inline void sched_domains_numa_masks_set(unsigned int cpu) { } |
1754 | static inline void sched_domains_numa_masks_clear(unsigned int cpu) { } | |
e0e8d491 WL |
1755 | static inline int sched_numa_find_closest(const struct cpumask *cpus, int cpu) |
1756 | { | |
1757 | return nr_cpu_ids; | |
1758 | } | |
f2cb1360 IM |
1759 | #endif |
1760 | ||
f809ca9a | 1761 | #ifdef CONFIG_NUMA_BALANCING |
44dba3d5 IM |
1762 | /* The regions in numa_faults array from task_struct */ |
1763 | enum numa_faults_stats { | |
1764 | NUMA_MEM = 0, | |
1765 | NUMA_CPU, | |
1766 | NUMA_MEMBUF, | |
1767 | NUMA_CPUBUF | |
1768 | }; | |
0ec8aa00 | 1769 | extern void sched_setnuma(struct task_struct *p, int node); |
e6628d5b | 1770 | extern int migrate_task_to(struct task_struct *p, int cpu); |
0ad4e3df SD |
1771 | extern int migrate_swap(struct task_struct *p, struct task_struct *t, |
1772 | int cpu, int scpu); | |
13784475 MG |
1773 | extern void init_numa_balancing(unsigned long clone_flags, struct task_struct *p); |
1774 | #else | |
1775 | static inline void | |
1776 | init_numa_balancing(unsigned long clone_flags, struct task_struct *p) | |
1777 | { | |
1778 | } | |
f809ca9a MG |
1779 | #endif /* CONFIG_NUMA_BALANCING */ |
1780 | ||
518cd623 PZ |
1781 | #ifdef CONFIG_SMP |
1782 | ||
e3fca9e7 PZ |
1783 | static inline void |
1784 | queue_balance_callback(struct rq *rq, | |
8e5bad7d | 1785 | struct balance_callback *head, |
e3fca9e7 PZ |
1786 | void (*func)(struct rq *rq)) |
1787 | { | |
5cb9eaa3 | 1788 | lockdep_assert_rq_held(rq); |
e3fca9e7 | 1789 | |
04193d59 PZ |
1790 | /* |
1791 | * Don't (re)queue an already queued item; nor queue anything when | |
1792 | * balance_push() is active, see the comment with | |
1793 | * balance_push_callback. | |
1794 | */ | |
ae792702 | 1795 | if (unlikely(head->next || rq->balance_callback == &balance_push_callback)) |
e3fca9e7 PZ |
1796 | return; |
1797 | ||
8e5bad7d | 1798 | head->func = func; |
e3fca9e7 PZ |
1799 | head->next = rq->balance_callback; |
1800 | rq->balance_callback = head; | |
1801 | } | |
1802 | ||
029632fb PZ |
1803 | #define rcu_dereference_check_sched_domain(p) \ |
1804 | rcu_dereference_check((p), \ | |
1805 | lockdep_is_held(&sched_domains_mutex)) | |
1806 | ||
1807 | /* | |
1808 | * The domain tree (rq->sd) is protected by RCU's quiescent state transition. | |
337e9b07 | 1809 | * See destroy_sched_domains: call_rcu for details. |
029632fb PZ |
1810 | * |
1811 | * The domain tree of any CPU may only be accessed from within | |
1812 | * preempt-disabled sections. | |
1813 | */ | |
1814 | #define for_each_domain(cpu, __sd) \ | |
518cd623 PZ |
1815 | for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \ |
1816 | __sd; __sd = __sd->parent) | |
029632fb | 1817 | |
40b4d3dc RN |
1818 | /* A mask of all the SD flags that have the SDF_SHARED_CHILD metaflag */ |
1819 | #define SD_FLAG(name, mflags) (name * !!((mflags) & SDF_SHARED_CHILD)) | | |
1820 | static const unsigned int SD_SHARED_CHILD_MASK = | |
1821 | #include <linux/sched/sd_flags.h> | |
1822 | 0; | |
1823 | #undef SD_FLAG | |
1824 | ||
518cd623 PZ |
1825 | /** |
1826 | * highest_flag_domain - Return highest sched_domain containing flag. | |
97fb7a0a | 1827 | * @cpu: The CPU whose highest level of sched domain is to |
518cd623 PZ |
1828 | * be returned. |
1829 | * @flag: The flag to check for the highest sched_domain | |
97fb7a0a | 1830 | * for the given CPU. |
518cd623 | 1831 | * |
40b4d3dc RN |
1832 | * Returns the highest sched_domain of a CPU which contains @flag. If @flag has |
1833 | * the SDF_SHARED_CHILD metaflag, all the children domains also have @flag. | |
518cd623 PZ |
1834 | */ |
1835 | static inline struct sched_domain *highest_flag_domain(int cpu, int flag) | |
1836 | { | |
1837 | struct sched_domain *sd, *hsd = NULL; | |
1838 | ||
1839 | for_each_domain(cpu, sd) { | |
40b4d3dc RN |
1840 | if (sd->flags & flag) { |
1841 | hsd = sd; | |
1842 | continue; | |
1843 | } | |
1844 | ||
1845 | /* | |
1846 | * Stop the search if @flag is known to be shared at lower | |
1847 | * levels. It will not be found further up. | |
1848 | */ | |
1849 | if (flag & SD_SHARED_CHILD_MASK) | |
518cd623 | 1850 | break; |
518cd623 PZ |
1851 | } |
1852 | ||
1853 | return hsd; | |
1854 | } | |
1855 | ||
fb13c7ee MG |
1856 | static inline struct sched_domain *lowest_flag_domain(int cpu, int flag) |
1857 | { | |
1858 | struct sched_domain *sd; | |
1859 | ||
1860 | for_each_domain(cpu, sd) { | |
1861 | if (sd->flags & flag) | |
1862 | break; | |
1863 | } | |
1864 | ||
1865 | return sd; | |
1866 | } | |
1867 | ||
994aeb7a | 1868 | DECLARE_PER_CPU(struct sched_domain __rcu *, sd_llc); |
7d9ffa89 | 1869 | DECLARE_PER_CPU(int, sd_llc_size); |
518cd623 | 1870 | DECLARE_PER_CPU(int, sd_llc_id); |
994aeb7a JFG |
1871 | DECLARE_PER_CPU(struct sched_domain_shared __rcu *, sd_llc_shared); |
1872 | DECLARE_PER_CPU(struct sched_domain __rcu *, sd_numa); | |
1873 | DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_packing); | |
1874 | DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_cpucapacity); | |
df054e84 | 1875 | extern struct static_key_false sched_asym_cpucapacity; |
518cd623 | 1876 | |
740cf8a7 DE |
1877 | static __always_inline bool sched_asym_cpucap_active(void) |
1878 | { | |
1879 | return static_branch_unlikely(&sched_asym_cpucapacity); | |
1880 | } | |
1881 | ||
63b2ca30 | 1882 | struct sched_group_capacity { |
97fb7a0a | 1883 | atomic_t ref; |
5e6521ea | 1884 | /* |
172895e6 | 1885 | * CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity |
63b2ca30 | 1886 | * for a single CPU. |
5e6521ea | 1887 | */ |
97fb7a0a IM |
1888 | unsigned long capacity; |
1889 | unsigned long min_capacity; /* Min per-CPU capacity in group */ | |
e3d6d0cb | 1890 | unsigned long max_capacity; /* Max per-CPU capacity in group */ |
97fb7a0a IM |
1891 | unsigned long next_update; |
1892 | int imbalance; /* XXX unrelated to capacity but shared group state */ | |
5e6521ea | 1893 | |
005f874d | 1894 | #ifdef CONFIG_SCHED_DEBUG |
97fb7a0a | 1895 | int id; |
005f874d PZ |
1896 | #endif |
1897 | ||
eba9f082 | 1898 | unsigned long cpumask[]; /* Balance mask */ |
5e6521ea LZ |
1899 | }; |
1900 | ||
1901 | struct sched_group { | |
97fb7a0a IM |
1902 | struct sched_group *next; /* Must be a circular list */ |
1903 | atomic_t ref; | |
5e6521ea | 1904 | |
97fb7a0a | 1905 | unsigned int group_weight; |
d24cb0d9 | 1906 | unsigned int cores; |
63b2ca30 | 1907 | struct sched_group_capacity *sgc; |
97fb7a0a | 1908 | int asym_prefer_cpu; /* CPU of highest priority in group */ |
16d364ba | 1909 | int flags; |
5e6521ea LZ |
1910 | |
1911 | /* | |
1912 | * The CPUs this group covers. | |
1913 | * | |
1914 | * NOTE: this field is variable length. (Allocated dynamically | |
1915 | * by attaching extra space to the end of the structure, | |
1916 | * depending on how many CPUs the kernel has booted up with) | |
1917 | */ | |
04f5c362 | 1918 | unsigned long cpumask[]; |
5e6521ea LZ |
1919 | }; |
1920 | ||
ae4df9d6 | 1921 | static inline struct cpumask *sched_group_span(struct sched_group *sg) |
5e6521ea LZ |
1922 | { |
1923 | return to_cpumask(sg->cpumask); | |
1924 | } | |
1925 | ||
1926 | /* | |
e5c14b1f | 1927 | * See build_balance_mask(). |
5e6521ea | 1928 | */ |
e5c14b1f | 1929 | static inline struct cpumask *group_balance_mask(struct sched_group *sg) |
5e6521ea | 1930 | { |
63b2ca30 | 1931 | return to_cpumask(sg->sgc->cpumask); |
5e6521ea LZ |
1932 | } |
1933 | ||
c1174876 PZ |
1934 | extern int group_balance_cpu(struct sched_group *sg); |
1935 | ||
3b87f136 PZ |
1936 | #ifdef CONFIG_SCHED_DEBUG |
1937 | void update_sched_domain_debugfs(void); | |
bbdacdfe | 1938 | void dirty_sched_domain_sysctl(int cpu); |
3866e845 | 1939 | #else |
3b87f136 | 1940 | static inline void update_sched_domain_debugfs(void) |
3866e845 SRRH |
1941 | { |
1942 | } | |
bbdacdfe PZ |
1943 | static inline void dirty_sched_domain_sysctl(int cpu) |
1944 | { | |
1945 | } | |
3866e845 SRRH |
1946 | #endif |
1947 | ||
8a99b683 | 1948 | extern int sched_update_scaling(void); |
8f9ea86f WL |
1949 | |
1950 | static inline const struct cpumask *task_user_cpus(struct task_struct *p) | |
1951 | { | |
1952 | if (!p->user_cpus_ptr) | |
1953 | return cpu_possible_mask; /* &init_task.cpus_mask */ | |
1954 | return p->user_cpus_ptr; | |
1955 | } | |
d664e399 | 1956 | #endif /* CONFIG_SMP */ |
029632fb | 1957 | |
391e43da | 1958 | #include "stats.h" |
029632fb | 1959 | |
4feee7d1 JD |
1960 | #if defined(CONFIG_SCHED_CORE) && defined(CONFIG_SCHEDSTATS) |
1961 | ||
1962 | extern void __sched_core_account_forceidle(struct rq *rq); | |
1963 | ||
1964 | static inline void sched_core_account_forceidle(struct rq *rq) | |
1965 | { | |
1966 | if (schedstat_enabled()) | |
1967 | __sched_core_account_forceidle(rq); | |
1968 | } | |
1969 | ||
1970 | extern void __sched_core_tick(struct rq *rq); | |
1971 | ||
1972 | static inline void sched_core_tick(struct rq *rq) | |
1973 | { | |
1974 | if (sched_core_enabled(rq) && schedstat_enabled()) | |
1975 | __sched_core_tick(rq); | |
1976 | } | |
1977 | ||
1978 | #else | |
1979 | ||
1980 | static inline void sched_core_account_forceidle(struct rq *rq) {} | |
1981 | ||
1982 | static inline void sched_core_tick(struct rq *rq) {} | |
1983 | ||
1984 | #endif /* CONFIG_SCHED_CORE && CONFIG_SCHEDSTATS */ | |
1985 | ||
029632fb PZ |
1986 | #ifdef CONFIG_CGROUP_SCHED |
1987 | ||
1988 | /* | |
1989 | * Return the group to which this tasks belongs. | |
1990 | * | |
8af01f56 TH |
1991 | * We cannot use task_css() and friends because the cgroup subsystem |
1992 | * changes that value before the cgroup_subsys::attach() method is called, | |
1993 | * therefore we cannot pin it and might observe the wrong value. | |
8323f26c PZ |
1994 | * |
1995 | * The same is true for autogroup's p->signal->autogroup->tg, the autogroup | |
1996 | * core changes this before calling sched_move_task(). | |
1997 | * | |
1998 | * Instead we use a 'copy' which is updated from sched_move_task() while | |
1999 | * holding both task_struct::pi_lock and rq::lock. | |
029632fb PZ |
2000 | */ |
2001 | static inline struct task_group *task_group(struct task_struct *p) | |
2002 | { | |
8323f26c | 2003 | return p->sched_task_group; |
029632fb PZ |
2004 | } |
2005 | ||
2006 | /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */ | |
2007 | static inline void set_task_rq(struct task_struct *p, unsigned int cpu) | |
2008 | { | |
2009 | #if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED) | |
2010 | struct task_group *tg = task_group(p); | |
2011 | #endif | |
2012 | ||
2013 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
ad936d86 | 2014 | set_task_rq_fair(&p->se, p->se.cfs_rq, tg->cfs_rq[cpu]); |
029632fb PZ |
2015 | p->se.cfs_rq = tg->cfs_rq[cpu]; |
2016 | p->se.parent = tg->se[cpu]; | |
78b6b157 | 2017 | p->se.depth = tg->se[cpu] ? tg->se[cpu]->depth + 1 : 0; |
029632fb PZ |
2018 | #endif |
2019 | ||
2020 | #ifdef CONFIG_RT_GROUP_SCHED | |
2021 | p->rt.rt_rq = tg->rt_rq[cpu]; | |
2022 | p->rt.parent = tg->rt_se[cpu]; | |
2023 | #endif | |
2024 | } | |
2025 | ||
2026 | #else /* CONFIG_CGROUP_SCHED */ | |
2027 | ||
2028 | static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { } | |
2029 | static inline struct task_group *task_group(struct task_struct *p) | |
2030 | { | |
2031 | return NULL; | |
2032 | } | |
2033 | ||
2034 | #endif /* CONFIG_CGROUP_SCHED */ | |
2035 | ||
2036 | static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2037 | { | |
2038 | set_task_rq(p, cpu); | |
2039 | #ifdef CONFIG_SMP | |
2040 | /* | |
2041 | * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be | |
dfcb245e | 2042 | * successfully executed on another CPU. We must ensure that updates of |
029632fb PZ |
2043 | * per-task data have been completed by this moment. |
2044 | */ | |
2045 | smp_wmb(); | |
c546951d | 2046 | WRITE_ONCE(task_thread_info(p)->cpu, cpu); |
ac66f547 | 2047 | p->wake_cpu = cpu; |
029632fb PZ |
2048 | #endif |
2049 | } | |
2050 | ||
2051 | /* | |
2052 | * Tunables that become constants when CONFIG_SCHED_DEBUG is off: | |
2053 | */ | |
2054 | #ifdef CONFIG_SCHED_DEBUG | |
2055 | # define const_debug __read_mostly | |
2056 | #else | |
2057 | # define const_debug const | |
2058 | #endif | |
2059 | ||
029632fb PZ |
2060 | #define SCHED_FEAT(name, enabled) \ |
2061 | __SCHED_FEAT_##name , | |
2062 | ||
2063 | enum { | |
391e43da | 2064 | #include "features.h" |
f8b6d1cc | 2065 | __SCHED_FEAT_NR, |
029632fb PZ |
2066 | }; |
2067 | ||
2068 | #undef SCHED_FEAT | |
2069 | ||
a73f863a | 2070 | #ifdef CONFIG_SCHED_DEBUG |
765cc3a4 PB |
2071 | |
2072 | /* | |
2073 | * To support run-time toggling of sched features, all the translation units | |
2074 | * (but core.c) reference the sysctl_sched_features defined in core.c. | |
2075 | */ | |
2076 | extern const_debug unsigned int sysctl_sched_features; | |
2077 | ||
a73f863a | 2078 | #ifdef CONFIG_JUMP_LABEL |
f8b6d1cc | 2079 | #define SCHED_FEAT(name, enabled) \ |
c5905afb | 2080 | static __always_inline bool static_branch_##name(struct static_key *key) \ |
f8b6d1cc | 2081 | { \ |
6e76ea8a | 2082 | return static_key_##enabled(key); \ |
f8b6d1cc PZ |
2083 | } |
2084 | ||
2085 | #include "features.h" | |
f8b6d1cc PZ |
2086 | #undef SCHED_FEAT |
2087 | ||
c5905afb | 2088 | extern struct static_key sched_feat_keys[__SCHED_FEAT_NR]; |
f8b6d1cc | 2089 | #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x])) |
765cc3a4 | 2090 | |
a73f863a JL |
2091 | #else /* !CONFIG_JUMP_LABEL */ |
2092 | ||
2093 | #define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) | |
2094 | ||
2095 | #endif /* CONFIG_JUMP_LABEL */ | |
2096 | ||
2097 | #else /* !SCHED_DEBUG */ | |
765cc3a4 PB |
2098 | |
2099 | /* | |
2100 | * Each translation unit has its own copy of sysctl_sched_features to allow | |
2101 | * constants propagation at compile time and compiler optimization based on | |
2102 | * features default. | |
2103 | */ | |
2104 | #define SCHED_FEAT(name, enabled) \ | |
2105 | (1UL << __SCHED_FEAT_##name) * enabled | | |
2106 | static const_debug __maybe_unused unsigned int sysctl_sched_features = | |
2107 | #include "features.h" | |
2108 | 0; | |
2109 | #undef SCHED_FEAT | |
2110 | ||
7e6f4c5d | 2111 | #define sched_feat(x) !!(sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) |
765cc3a4 | 2112 | |
a73f863a | 2113 | #endif /* SCHED_DEBUG */ |
029632fb | 2114 | |
2a595721 | 2115 | extern struct static_key_false sched_numa_balancing; |
cb251765 | 2116 | extern struct static_key_false sched_schedstats; |
cbee9f88 | 2117 | |
029632fb PZ |
2118 | static inline u64 global_rt_period(void) |
2119 | { | |
2120 | return (u64)sysctl_sched_rt_period * NSEC_PER_USEC; | |
2121 | } | |
2122 | ||
2123 | static inline u64 global_rt_runtime(void) | |
2124 | { | |
2125 | if (sysctl_sched_rt_runtime < 0) | |
2126 | return RUNTIME_INF; | |
2127 | ||
2128 | return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC; | |
2129 | } | |
2130 | ||
029632fb PZ |
2131 | static inline int task_current(struct rq *rq, struct task_struct *p) |
2132 | { | |
2133 | return rq->curr == p; | |
2134 | } | |
2135 | ||
0b9d46fc | 2136 | static inline int task_on_cpu(struct rq *rq, struct task_struct *p) |
029632fb PZ |
2137 | { |
2138 | #ifdef CONFIG_SMP | |
2139 | return p->on_cpu; | |
2140 | #else | |
2141 | return task_current(rq, p); | |
2142 | #endif | |
2143 | } | |
2144 | ||
da0c1e65 KT |
2145 | static inline int task_on_rq_queued(struct task_struct *p) |
2146 | { | |
2147 | return p->on_rq == TASK_ON_RQ_QUEUED; | |
2148 | } | |
029632fb | 2149 | |
cca26e80 KT |
2150 | static inline int task_on_rq_migrating(struct task_struct *p) |
2151 | { | |
c546951d | 2152 | return READ_ONCE(p->on_rq) == TASK_ON_RQ_MIGRATING; |
cca26e80 KT |
2153 | } |
2154 | ||
17770579 | 2155 | /* Wake flags. The first three directly map to some SD flag value */ |
ab83f455 PO |
2156 | #define WF_EXEC 0x02 /* Wakeup after exec; maps to SD_BALANCE_EXEC */ |
2157 | #define WF_FORK 0x04 /* Wakeup after fork; maps to SD_BALANCE_FORK */ | |
2158 | #define WF_TTWU 0x08 /* Wakeup; maps to SD_BALANCE_WAKE */ | |
17770579 | 2159 | |
ab83f455 PO |
2160 | #define WF_SYNC 0x10 /* Waker goes to sleep after wakeup */ |
2161 | #define WF_MIGRATED 0x20 /* Internal use, task got migrated */ | |
2162 | #define WF_CURRENT_CPU 0x40 /* Prefer to move the wakee to the current CPU. */ | |
17770579 VS |
2163 | |
2164 | #ifdef CONFIG_SMP | |
2165 | static_assert(WF_EXEC == SD_BALANCE_EXEC); | |
2166 | static_assert(WF_FORK == SD_BALANCE_FORK); | |
2167 | static_assert(WF_TTWU == SD_BALANCE_WAKE); | |
2168 | #endif | |
b13095f0 | 2169 | |
029632fb PZ |
2170 | /* |
2171 | * To aid in avoiding the subversion of "niceness" due to uneven distribution | |
2172 | * of tasks with abnormal "nice" values across CPUs the contribution that | |
2173 | * each task makes to its run queue's load is weighted according to its | |
2174 | * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a | |
2175 | * scaled version of the new time slice allocation that they receive on time | |
2176 | * slice expiry etc. | |
2177 | */ | |
2178 | ||
97fb7a0a IM |
2179 | #define WEIGHT_IDLEPRIO 3 |
2180 | #define WMULT_IDLEPRIO 1431655765 | |
029632fb | 2181 | |
97fb7a0a IM |
2182 | extern const int sched_prio_to_weight[40]; |
2183 | extern const u32 sched_prio_to_wmult[40]; | |
029632fb | 2184 | |
ff77e468 PZ |
2185 | /* |
2186 | * {de,en}queue flags: | |
2187 | * | |
2188 | * DEQUEUE_SLEEP - task is no longer runnable | |
2189 | * ENQUEUE_WAKEUP - task just became runnable | |
2190 | * | |
2191 | * SAVE/RESTORE - an otherwise spurious dequeue/enqueue, done to ensure tasks | |
2192 | * are in a known state which allows modification. Such pairs | |
2193 | * should preserve as much state as possible. | |
2194 | * | |
2195 | * MOVE - paired with SAVE/RESTORE, explicitly does not preserve the location | |
2196 | * in the runqueue. | |
2197 | * | |
2198 | * ENQUEUE_HEAD - place at front of runqueue (tail if not specified) | |
2199 | * ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline) | |
59efa0ba | 2200 | * ENQUEUE_MIGRATED - the task was migrated during wakeup |
ff77e468 PZ |
2201 | * |
2202 | */ | |
2203 | ||
2204 | #define DEQUEUE_SLEEP 0x01 | |
97fb7a0a IM |
2205 | #define DEQUEUE_SAVE 0x02 /* Matches ENQUEUE_RESTORE */ |
2206 | #define DEQUEUE_MOVE 0x04 /* Matches ENQUEUE_MOVE */ | |
2207 | #define DEQUEUE_NOCLOCK 0x08 /* Matches ENQUEUE_NOCLOCK */ | |
ff77e468 | 2208 | |
1de64443 | 2209 | #define ENQUEUE_WAKEUP 0x01 |
ff77e468 PZ |
2210 | #define ENQUEUE_RESTORE 0x02 |
2211 | #define ENQUEUE_MOVE 0x04 | |
0a67d1ee | 2212 | #define ENQUEUE_NOCLOCK 0x08 |
ff77e468 | 2213 | |
0a67d1ee PZ |
2214 | #define ENQUEUE_HEAD 0x10 |
2215 | #define ENQUEUE_REPLENISH 0x20 | |
c82ba9fa | 2216 | #ifdef CONFIG_SMP |
0a67d1ee | 2217 | #define ENQUEUE_MIGRATED 0x40 |
c82ba9fa | 2218 | #else |
59efa0ba | 2219 | #define ENQUEUE_MIGRATED 0x00 |
c82ba9fa | 2220 | #endif |
d07f09a1 | 2221 | #define ENQUEUE_INITIAL 0x80 |
c82ba9fa | 2222 | |
37e117c0 PZ |
2223 | #define RETRY_TASK ((void *)-1UL) |
2224 | ||
713a2e21 WL |
2225 | struct affinity_context { |
2226 | const struct cpumask *new_mask; | |
8f9ea86f | 2227 | struct cpumask *user_mask; |
713a2e21 WL |
2228 | unsigned int flags; |
2229 | }; | |
2230 | ||
c82ba9fa | 2231 | struct sched_class { |
c82ba9fa | 2232 | |
69842cba PB |
2233 | #ifdef CONFIG_UCLAMP_TASK |
2234 | int uclamp_enabled; | |
2235 | #endif | |
2236 | ||
c82ba9fa LZ |
2237 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); |
2238 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); | |
97fb7a0a | 2239 | void (*yield_task) (struct rq *rq); |
0900acf2 | 2240 | bool (*yield_to_task)(struct rq *rq, struct task_struct *p); |
c82ba9fa | 2241 | |
97fb7a0a | 2242 | void (*check_preempt_curr)(struct rq *rq, struct task_struct *p, int flags); |
c82ba9fa | 2243 | |
98c2f700 PZ |
2244 | struct task_struct *(*pick_next_task)(struct rq *rq); |
2245 | ||
6e2df058 | 2246 | void (*put_prev_task)(struct rq *rq, struct task_struct *p); |
a0e813f2 | 2247 | void (*set_next_task)(struct rq *rq, struct task_struct *p, bool first); |
c82ba9fa LZ |
2248 | |
2249 | #ifdef CONFIG_SMP | |
6e2df058 | 2250 | int (*balance)(struct rq *rq, struct task_struct *prev, struct rq_flags *rf); |
3aef1551 | 2251 | int (*select_task_rq)(struct task_struct *p, int task_cpu, int flags); |
21f56ffe PZ |
2252 | |
2253 | struct task_struct * (*pick_task)(struct rq *rq); | |
2254 | ||
1327237a | 2255 | void (*migrate_task_rq)(struct task_struct *p, int new_cpu); |
c82ba9fa | 2256 | |
97fb7a0a | 2257 | void (*task_woken)(struct rq *this_rq, struct task_struct *task); |
c82ba9fa | 2258 | |
713a2e21 | 2259 | void (*set_cpus_allowed)(struct task_struct *p, struct affinity_context *ctx); |
c82ba9fa LZ |
2260 | |
2261 | void (*rq_online)(struct rq *rq); | |
2262 | void (*rq_offline)(struct rq *rq); | |
a7c81556 PZ |
2263 | |
2264 | struct rq *(*find_lock_rq)(struct task_struct *p, struct rq *rq); | |
c82ba9fa LZ |
2265 | #endif |
2266 | ||
97fb7a0a IM |
2267 | void (*task_tick)(struct rq *rq, struct task_struct *p, int queued); |
2268 | void (*task_fork)(struct task_struct *p); | |
2269 | void (*task_dead)(struct task_struct *p); | |
c82ba9fa | 2270 | |
67dfa1b7 KT |
2271 | /* |
2272 | * The switched_from() call is allowed to drop rq->lock, therefore we | |
3b03706f | 2273 | * cannot assume the switched_from/switched_to pair is serialized by |
67dfa1b7 KT |
2274 | * rq->lock. They are however serialized by p->pi_lock. |
2275 | */ | |
97fb7a0a IM |
2276 | void (*switched_from)(struct rq *this_rq, struct task_struct *task); |
2277 | void (*switched_to) (struct rq *this_rq, struct task_struct *task); | |
c82ba9fa | 2278 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, |
97fb7a0a | 2279 | int oldprio); |
c82ba9fa | 2280 | |
97fb7a0a IM |
2281 | unsigned int (*get_rr_interval)(struct rq *rq, |
2282 | struct task_struct *task); | |
c82ba9fa | 2283 | |
97fb7a0a | 2284 | void (*update_curr)(struct rq *rq); |
6e998916 | 2285 | |
c82ba9fa | 2286 | #ifdef CONFIG_FAIR_GROUP_SCHED |
39c42611 | 2287 | void (*task_change_group)(struct task_struct *p); |
c82ba9fa | 2288 | #endif |
530bfad1 HJ |
2289 | |
2290 | #ifdef CONFIG_SCHED_CORE | |
2291 | int (*task_is_throttled)(struct task_struct *p, int cpu); | |
2292 | #endif | |
43c31ac0 | 2293 | }; |
029632fb | 2294 | |
3f1d2a31 PZ |
2295 | static inline void put_prev_task(struct rq *rq, struct task_struct *prev) |
2296 | { | |
10e7071b | 2297 | WARN_ON_ONCE(rq->curr != prev); |
6e2df058 | 2298 | prev->sched_class->put_prev_task(rq, prev); |
3f1d2a31 PZ |
2299 | } |
2300 | ||
03b7fad1 | 2301 | static inline void set_next_task(struct rq *rq, struct task_struct *next) |
b2bf6c31 | 2302 | { |
a0e813f2 | 2303 | next->sched_class->set_next_task(rq, next, false); |
b2bf6c31 PZ |
2304 | } |
2305 | ||
43c31ac0 PZ |
2306 | |
2307 | /* | |
2308 | * Helper to define a sched_class instance; each one is placed in a separate | |
2309 | * section which is ordered by the linker script: | |
2310 | * | |
2311 | * include/asm-generic/vmlinux.lds.h | |
2312 | * | |
546a3fee PZ |
2313 | * *CAREFUL* they are laid out in *REVERSE* order!!! |
2314 | * | |
43c31ac0 PZ |
2315 | * Also enforce alignment on the instance, not the type, to guarantee layout. |
2316 | */ | |
2317 | #define DEFINE_SCHED_CLASS(name) \ | |
2318 | const struct sched_class name##_sched_class \ | |
2319 | __aligned(__alignof__(struct sched_class)) \ | |
2320 | __section("__" #name "_sched_class") | |
2321 | ||
c3a340f7 | 2322 | /* Defined in include/asm-generic/vmlinux.lds.h */ |
546a3fee PZ |
2323 | extern struct sched_class __sched_class_highest[]; |
2324 | extern struct sched_class __sched_class_lowest[]; | |
6e2df058 PZ |
2325 | |
2326 | #define for_class_range(class, _from, _to) \ | |
546a3fee | 2327 | for (class = (_from); class < (_to); class++) |
6e2df058 | 2328 | |
029632fb | 2329 | #define for_each_class(class) \ |
546a3fee PZ |
2330 | for_class_range(class, __sched_class_highest, __sched_class_lowest) |
2331 | ||
2332 | #define sched_class_above(_a, _b) ((_a) < (_b)) | |
029632fb PZ |
2333 | |
2334 | extern const struct sched_class stop_sched_class; | |
aab03e05 | 2335 | extern const struct sched_class dl_sched_class; |
029632fb PZ |
2336 | extern const struct sched_class rt_sched_class; |
2337 | extern const struct sched_class fair_sched_class; | |
2338 | extern const struct sched_class idle_sched_class; | |
2339 | ||
6e2df058 PZ |
2340 | static inline bool sched_stop_runnable(struct rq *rq) |
2341 | { | |
2342 | return rq->stop && task_on_rq_queued(rq->stop); | |
2343 | } | |
2344 | ||
2345 | static inline bool sched_dl_runnable(struct rq *rq) | |
2346 | { | |
2347 | return rq->dl.dl_nr_running > 0; | |
2348 | } | |
2349 | ||
2350 | static inline bool sched_rt_runnable(struct rq *rq) | |
2351 | { | |
2352 | return rq->rt.rt_queued > 0; | |
2353 | } | |
2354 | ||
2355 | static inline bool sched_fair_runnable(struct rq *rq) | |
2356 | { | |
2357 | return rq->cfs.nr_running > 0; | |
2358 | } | |
029632fb | 2359 | |
5d7d6056 | 2360 | extern struct task_struct *pick_next_task_fair(struct rq *rq, struct task_struct *prev, struct rq_flags *rf); |
98c2f700 | 2361 | extern struct task_struct *pick_next_task_idle(struct rq *rq); |
5d7d6056 | 2362 | |
af449901 PZ |
2363 | #define SCA_CHECK 0x01 |
2364 | #define SCA_MIGRATE_DISABLE 0x02 | |
2365 | #define SCA_MIGRATE_ENABLE 0x04 | |
07ec77a1 | 2366 | #define SCA_USER 0x08 |
af449901 | 2367 | |
029632fb PZ |
2368 | #ifdef CONFIG_SMP |
2369 | ||
63b2ca30 | 2370 | extern void update_group_capacity(struct sched_domain *sd, int cpu); |
b719203b | 2371 | |
7caff66f | 2372 | extern void trigger_load_balance(struct rq *rq); |
029632fb | 2373 | |
713a2e21 | 2374 | extern void set_cpus_allowed_common(struct task_struct *p, struct affinity_context *ctx); |
c5b28038 | 2375 | |
a7c81556 PZ |
2376 | static inline struct task_struct *get_push_task(struct rq *rq) |
2377 | { | |
2378 | struct task_struct *p = rq->curr; | |
2379 | ||
5cb9eaa3 | 2380 | lockdep_assert_rq_held(rq); |
a7c81556 PZ |
2381 | |
2382 | if (rq->push_busy) | |
2383 | return NULL; | |
2384 | ||
2385 | if (p->nr_cpus_allowed == 1) | |
2386 | return NULL; | |
2387 | ||
e681dcba SAS |
2388 | if (p->migration_disabled) |
2389 | return NULL; | |
2390 | ||
a7c81556 PZ |
2391 | rq->push_busy = true; |
2392 | return get_task_struct(p); | |
2393 | } | |
2394 | ||
2395 | extern int push_cpu_stop(void *arg); | |
c5b28038 | 2396 | |
029632fb PZ |
2397 | #endif |
2398 | ||
442bf3aa DL |
2399 | #ifdef CONFIG_CPU_IDLE |
2400 | static inline void idle_set_state(struct rq *rq, | |
2401 | struct cpuidle_state *idle_state) | |
2402 | { | |
2403 | rq->idle_state = idle_state; | |
2404 | } | |
2405 | ||
2406 | static inline struct cpuidle_state *idle_get_state(struct rq *rq) | |
2407 | { | |
9148a3a1 | 2408 | SCHED_WARN_ON(!rcu_read_lock_held()); |
97fb7a0a | 2409 | |
442bf3aa DL |
2410 | return rq->idle_state; |
2411 | } | |
2412 | #else | |
2413 | static inline void idle_set_state(struct rq *rq, | |
2414 | struct cpuidle_state *idle_state) | |
2415 | { | |
2416 | } | |
2417 | ||
2418 | static inline struct cpuidle_state *idle_get_state(struct rq *rq) | |
2419 | { | |
2420 | return NULL; | |
2421 | } | |
2422 | #endif | |
2423 | ||
8663effb | 2424 | extern void schedule_idle(void); |
22dc02f8 | 2425 | asmlinkage void schedule_user(void); |
8663effb | 2426 | |
029632fb PZ |
2427 | extern void sysrq_sched_debug_show(void); |
2428 | extern void sched_init_granularity(void); | |
2429 | extern void update_max_interval(void); | |
1baca4ce JL |
2430 | |
2431 | extern void init_sched_dl_class(void); | |
029632fb PZ |
2432 | extern void init_sched_rt_class(void); |
2433 | extern void init_sched_fair_class(void); | |
2434 | ||
9059393e VG |
2435 | extern void reweight_task(struct task_struct *p, int prio); |
2436 | ||
8875125e | 2437 | extern void resched_curr(struct rq *rq); |
029632fb PZ |
2438 | extern void resched_cpu(int cpu); |
2439 | ||
2440 | extern struct rt_bandwidth def_rt_bandwidth; | |
2441 | extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime); | |
d664e399 | 2442 | extern bool sched_rt_bandwidth_account(struct rt_rq *rt_rq); |
029632fb | 2443 | |
aab03e05 | 2444 | extern void init_dl_task_timer(struct sched_dl_entity *dl_se); |
209a0cbd | 2445 | extern void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se); |
aab03e05 | 2446 | |
97fb7a0a IM |
2447 | #define BW_SHIFT 20 |
2448 | #define BW_UNIT (1 << BW_SHIFT) | |
2449 | #define RATIO_SHIFT 8 | |
d505b8af HC |
2450 | #define MAX_BW_BITS (64 - BW_SHIFT) |
2451 | #define MAX_BW ((1ULL << MAX_BW_BITS) - 1) | |
332ac17e DF |
2452 | unsigned long to_ratio(u64 period, u64 runtime); |
2453 | ||
540247fb | 2454 | extern void init_entity_runnable_average(struct sched_entity *se); |
d0fe0b9c | 2455 | extern void post_init_entity_util_avg(struct task_struct *p); |
a75cdaa9 | 2456 | |
76d92ac3 FW |
2457 | #ifdef CONFIG_NO_HZ_FULL |
2458 | extern bool sched_can_stop_tick(struct rq *rq); | |
d84b3131 | 2459 | extern int __init sched_tick_offload_init(void); |
76d92ac3 FW |
2460 | |
2461 | /* | |
2462 | * Tick may be needed by tasks in the runqueue depending on their policy and | |
2463 | * requirements. If tick is needed, lets send the target an IPI to kick it out of | |
2464 | * nohz mode if necessary. | |
2465 | */ | |
2466 | static inline void sched_update_tick_dependency(struct rq *rq) | |
2467 | { | |
21a6ee14 | 2468 | int cpu = cpu_of(rq); |
76d92ac3 FW |
2469 | |
2470 | if (!tick_nohz_full_cpu(cpu)) | |
2471 | return; | |
2472 | ||
2473 | if (sched_can_stop_tick(rq)) | |
2474 | tick_nohz_dep_clear_cpu(cpu, TICK_DEP_BIT_SCHED); | |
2475 | else | |
2476 | tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED); | |
2477 | } | |
2478 | #else | |
d84b3131 | 2479 | static inline int sched_tick_offload_init(void) { return 0; } |
76d92ac3 FW |
2480 | static inline void sched_update_tick_dependency(struct rq *rq) { } |
2481 | #endif | |
2482 | ||
72465447 | 2483 | static inline void add_nr_running(struct rq *rq, unsigned count) |
029632fb | 2484 | { |
72465447 KT |
2485 | unsigned prev_nr = rq->nr_running; |
2486 | ||
2487 | rq->nr_running = prev_nr + count; | |
9d246053 PA |
2488 | if (trace_sched_update_nr_running_tp_enabled()) { |
2489 | call_trace_sched_update_nr_running(rq, count); | |
2490 | } | |
9f3660c2 | 2491 | |
4486edd1 | 2492 | #ifdef CONFIG_SMP |
3e184501 | 2493 | if (prev_nr < 2 && rq->nr_running >= 2) { |
e90c8fe1 VS |
2494 | if (!READ_ONCE(rq->rd->overload)) |
2495 | WRITE_ONCE(rq->rd->overload, 1); | |
4486edd1 | 2496 | } |
3e184501 | 2497 | #endif |
76d92ac3 FW |
2498 | |
2499 | sched_update_tick_dependency(rq); | |
029632fb PZ |
2500 | } |
2501 | ||
72465447 | 2502 | static inline void sub_nr_running(struct rq *rq, unsigned count) |
029632fb | 2503 | { |
72465447 | 2504 | rq->nr_running -= count; |
9d246053 | 2505 | if (trace_sched_update_nr_running_tp_enabled()) { |
a1bd0685 | 2506 | call_trace_sched_update_nr_running(rq, -count); |
9d246053 PA |
2507 | } |
2508 | ||
76d92ac3 FW |
2509 | /* Check if we still need preemption */ |
2510 | sched_update_tick_dependency(rq); | |
029632fb PZ |
2511 | } |
2512 | ||
029632fb PZ |
2513 | extern void activate_task(struct rq *rq, struct task_struct *p, int flags); |
2514 | extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags); | |
2515 | ||
2516 | extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags); | |
2517 | ||
c59862f8 VG |
2518 | #ifdef CONFIG_PREEMPT_RT |
2519 | #define SCHED_NR_MIGRATE_BREAK 8 | |
2520 | #else | |
2521 | #define SCHED_NR_MIGRATE_BREAK 32 | |
2522 | #endif | |
2523 | ||
029632fb PZ |
2524 | extern const_debug unsigned int sysctl_sched_nr_migrate; |
2525 | extern const_debug unsigned int sysctl_sched_migration_cost; | |
2526 | ||
e4ec3318 | 2527 | extern unsigned int sysctl_sched_base_slice; |
147f3efa | 2528 | |
18765447 | 2529 | #ifdef CONFIG_SCHED_DEBUG |
18765447 HL |
2530 | extern int sysctl_resched_latency_warn_ms; |
2531 | extern int sysctl_resched_latency_warn_once; | |
2532 | ||
2533 | extern unsigned int sysctl_sched_tunable_scaling; | |
2534 | ||
2535 | extern unsigned int sysctl_numa_balancing_scan_delay; | |
2536 | extern unsigned int sysctl_numa_balancing_scan_period_min; | |
2537 | extern unsigned int sysctl_numa_balancing_scan_period_max; | |
2538 | extern unsigned int sysctl_numa_balancing_scan_size; | |
33024536 | 2539 | extern unsigned int sysctl_numa_balancing_hot_threshold; |
18765447 HL |
2540 | #endif |
2541 | ||
029632fb PZ |
2542 | #ifdef CONFIG_SCHED_HRTICK |
2543 | ||
2544 | /* | |
2545 | * Use hrtick when: | |
2546 | * - enabled by features | |
2547 | * - hrtimer is actually high res | |
2548 | */ | |
2549 | static inline int hrtick_enabled(struct rq *rq) | |
2550 | { | |
029632fb PZ |
2551 | if (!cpu_active(cpu_of(rq))) |
2552 | return 0; | |
2553 | return hrtimer_is_hres_active(&rq->hrtick_timer); | |
2554 | } | |
2555 | ||
e0ee463c JL |
2556 | static inline int hrtick_enabled_fair(struct rq *rq) |
2557 | { | |
2558 | if (!sched_feat(HRTICK)) | |
2559 | return 0; | |
2560 | return hrtick_enabled(rq); | |
2561 | } | |
2562 | ||
2563 | static inline int hrtick_enabled_dl(struct rq *rq) | |
2564 | { | |
2565 | if (!sched_feat(HRTICK_DL)) | |
2566 | return 0; | |
2567 | return hrtick_enabled(rq); | |
2568 | } | |
2569 | ||
029632fb PZ |
2570 | void hrtick_start(struct rq *rq, u64 delay); |
2571 | ||
b39e66ea MG |
2572 | #else |
2573 | ||
e0ee463c JL |
2574 | static inline int hrtick_enabled_fair(struct rq *rq) |
2575 | { | |
2576 | return 0; | |
2577 | } | |
2578 | ||
2579 | static inline int hrtick_enabled_dl(struct rq *rq) | |
2580 | { | |
2581 | return 0; | |
2582 | } | |
2583 | ||
b39e66ea MG |
2584 | static inline int hrtick_enabled(struct rq *rq) |
2585 | { | |
2586 | return 0; | |
2587 | } | |
2588 | ||
029632fb PZ |
2589 | #endif /* CONFIG_SCHED_HRTICK */ |
2590 | ||
1567c3e3 GG |
2591 | #ifndef arch_scale_freq_tick |
2592 | static __always_inline | |
2593 | void arch_scale_freq_tick(void) | |
2594 | { | |
2595 | } | |
2596 | #endif | |
2597 | ||
dfbca41f | 2598 | #ifndef arch_scale_freq_capacity |
f4470cdf VS |
2599 | /** |
2600 | * arch_scale_freq_capacity - get the frequency scale factor of a given CPU. | |
2601 | * @cpu: the CPU in question. | |
2602 | * | |
2603 | * Return: the frequency scale factor normalized against SCHED_CAPACITY_SCALE, i.e. | |
2604 | * | |
2605 | * f_curr | |
2606 | * ------ * SCHED_CAPACITY_SCALE | |
2607 | * f_max | |
2608 | */ | |
dfbca41f | 2609 | static __always_inline |
7673c8a4 | 2610 | unsigned long arch_scale_freq_capacity(int cpu) |
dfbca41f PZ |
2611 | { |
2612 | return SCHED_CAPACITY_SCALE; | |
2613 | } | |
2614 | #endif | |
b5b4860d | 2615 | |
2679a837 HJ |
2616 | #ifdef CONFIG_SCHED_DEBUG |
2617 | /* | |
2618 | * In double_lock_balance()/double_rq_lock(), we use raw_spin_rq_lock() to | |
2619 | * acquire rq lock instead of rq_lock(). So at the end of these two functions | |
2620 | * we need to call double_rq_clock_clear_update() to clear RQCF_UPDATED of | |
2621 | * rq->clock_update_flags to avoid the WARN_DOUBLE_CLOCK warning. | |
2622 | */ | |
2623 | static inline void double_rq_clock_clear_update(struct rq *rq1, struct rq *rq2) | |
2624 | { | |
2625 | rq1->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP); | |
2626 | /* rq1 == rq2 for !CONFIG_SMP, so just clear RQCF_UPDATED once. */ | |
2627 | #ifdef CONFIG_SMP | |
2628 | rq2->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP); | |
2629 | #endif | |
2630 | } | |
2631 | #else | |
2632 | static inline void double_rq_clock_clear_update(struct rq *rq1, struct rq *rq2) {} | |
2633 | #endif | |
d66f1b06 | 2634 | |
5bb76f1d PZ |
2635 | #define DEFINE_LOCK_GUARD_2(name, type, _lock, _unlock, ...) \ |
2636 | __DEFINE_UNLOCK_GUARD(name, type, _unlock, type *lock2; __VA_ARGS__) \ | |
2637 | static inline class_##name##_t class_##name##_constructor(type *lock, type *lock2) \ | |
2638 | { class_##name##_t _t = { .lock = lock, .lock2 = lock2 }, *_T = &_t; \ | |
2639 | _lock; return _t; } | |
2640 | ||
029632fb | 2641 | #ifdef CONFIG_SMP |
029632fb | 2642 | |
d66f1b06 PZ |
2643 | static inline bool rq_order_less(struct rq *rq1, struct rq *rq2) |
2644 | { | |
9edeaea1 PZ |
2645 | #ifdef CONFIG_SCHED_CORE |
2646 | /* | |
2647 | * In order to not have {0,2},{1,3} turn into into an AB-BA, | |
2648 | * order by core-id first and cpu-id second. | |
2649 | * | |
2650 | * Notably: | |
2651 | * | |
2652 | * double_rq_lock(0,3); will take core-0, core-1 lock | |
2653 | * double_rq_lock(1,2); will take core-1, core-0 lock | |
2654 | * | |
2655 | * when only cpu-id is considered. | |
2656 | */ | |
2657 | if (rq1->core->cpu < rq2->core->cpu) | |
2658 | return true; | |
2659 | if (rq1->core->cpu > rq2->core->cpu) | |
2660 | return false; | |
2661 | ||
2662 | /* | |
2663 | * __sched_core_flip() relies on SMT having cpu-id lock order. | |
2664 | */ | |
2665 | #endif | |
d66f1b06 PZ |
2666 | return rq1->cpu < rq2->cpu; |
2667 | } | |
2668 | ||
2669 | extern void double_rq_lock(struct rq *rq1, struct rq *rq2); | |
2670 | ||
2671 | #ifdef CONFIG_PREEMPTION | |
029632fb PZ |
2672 | |
2673 | /* | |
2674 | * fair double_lock_balance: Safely acquires both rq->locks in a fair | |
2675 | * way at the expense of forcing extra atomic operations in all | |
2676 | * invocations. This assures that the double_lock is acquired using the | |
2677 | * same underlying policy as the spinlock_t on this architecture, which | |
2678 | * reduces latency compared to the unfair variant below. However, it | |
2679 | * also adds more overhead and therefore may reduce throughput. | |
2680 | */ | |
2681 | static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
2682 | __releases(this_rq->lock) | |
2683 | __acquires(busiest->lock) | |
2684 | __acquires(this_rq->lock) | |
2685 | { | |
5cb9eaa3 | 2686 | raw_spin_rq_unlock(this_rq); |
029632fb PZ |
2687 | double_rq_lock(this_rq, busiest); |
2688 | ||
2689 | return 1; | |
2690 | } | |
2691 | ||
2692 | #else | |
2693 | /* | |
2694 | * Unfair double_lock_balance: Optimizes throughput at the expense of | |
2695 | * latency by eliminating extra atomic operations when the locks are | |
97fb7a0a IM |
2696 | * already in proper order on entry. This favors lower CPU-ids and will |
2697 | * grant the double lock to lower CPUs over higher ids under contention, | |
029632fb PZ |
2698 | * regardless of entry order into the function. |
2699 | */ | |
2700 | static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
2701 | __releases(this_rq->lock) | |
2702 | __acquires(busiest->lock) | |
2703 | __acquires(this_rq->lock) | |
2704 | { | |
2679a837 HJ |
2705 | if (__rq_lockp(this_rq) == __rq_lockp(busiest) || |
2706 | likely(raw_spin_rq_trylock(busiest))) { | |
2707 | double_rq_clock_clear_update(this_rq, busiest); | |
5cb9eaa3 | 2708 | return 0; |
2679a837 | 2709 | } |
5cb9eaa3 | 2710 | |
d66f1b06 | 2711 | if (rq_order_less(this_rq, busiest)) { |
5cb9eaa3 | 2712 | raw_spin_rq_lock_nested(busiest, SINGLE_DEPTH_NESTING); |
2679a837 | 2713 | double_rq_clock_clear_update(this_rq, busiest); |
5cb9eaa3 | 2714 | return 0; |
029632fb | 2715 | } |
5cb9eaa3 PZ |
2716 | |
2717 | raw_spin_rq_unlock(this_rq); | |
d66f1b06 | 2718 | double_rq_lock(this_rq, busiest); |
5cb9eaa3 PZ |
2719 | |
2720 | return 1; | |
029632fb PZ |
2721 | } |
2722 | ||
c1a280b6 | 2723 | #endif /* CONFIG_PREEMPTION */ |
029632fb PZ |
2724 | |
2725 | /* | |
2726 | * double_lock_balance - lock the busiest runqueue, this_rq is locked already. | |
2727 | */ | |
2728 | static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
2729 | { | |
5cb9eaa3 | 2730 | lockdep_assert_irqs_disabled(); |
029632fb PZ |
2731 | |
2732 | return _double_lock_balance(this_rq, busiest); | |
2733 | } | |
2734 | ||
2735 | static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest) | |
2736 | __releases(busiest->lock) | |
2737 | { | |
9ef7e7e3 | 2738 | if (__rq_lockp(this_rq) != __rq_lockp(busiest)) |
5cb9eaa3 | 2739 | raw_spin_rq_unlock(busiest); |
9ef7e7e3 | 2740 | lock_set_subclass(&__rq_lockp(this_rq)->dep_map, 0, _RET_IP_); |
029632fb PZ |
2741 | } |
2742 | ||
74602315 PZ |
2743 | static inline void double_lock(spinlock_t *l1, spinlock_t *l2) |
2744 | { | |
2745 | if (l1 > l2) | |
2746 | swap(l1, l2); | |
2747 | ||
2748 | spin_lock(l1); | |
2749 | spin_lock_nested(l2, SINGLE_DEPTH_NESTING); | |
2750 | } | |
2751 | ||
60e69eed MG |
2752 | static inline void double_lock_irq(spinlock_t *l1, spinlock_t *l2) |
2753 | { | |
2754 | if (l1 > l2) | |
2755 | swap(l1, l2); | |
2756 | ||
2757 | spin_lock_irq(l1); | |
2758 | spin_lock_nested(l2, SINGLE_DEPTH_NESTING); | |
2759 | } | |
2760 | ||
74602315 PZ |
2761 | static inline void double_raw_lock(raw_spinlock_t *l1, raw_spinlock_t *l2) |
2762 | { | |
2763 | if (l1 > l2) | |
2764 | swap(l1, l2); | |
2765 | ||
2766 | raw_spin_lock(l1); | |
2767 | raw_spin_lock_nested(l2, SINGLE_DEPTH_NESTING); | |
2768 | } | |
2769 | ||
5bb76f1d PZ |
2770 | static inline void double_raw_unlock(raw_spinlock_t *l1, raw_spinlock_t *l2) |
2771 | { | |
2772 | raw_spin_unlock(l1); | |
2773 | raw_spin_unlock(l2); | |
2774 | } | |
2775 | ||
2776 | DEFINE_LOCK_GUARD_2(double_raw_spinlock, raw_spinlock_t, | |
2777 | double_raw_lock(_T->lock, _T->lock2), | |
2778 | double_raw_unlock(_T->lock, _T->lock2)) | |
2779 | ||
029632fb PZ |
2780 | /* |
2781 | * double_rq_unlock - safely unlock two runqueues | |
2782 | * | |
2783 | * Note this does not restore interrupts like task_rq_unlock, | |
2784 | * you need to do so manually after calling. | |
2785 | */ | |
2786 | static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) | |
2787 | __releases(rq1->lock) | |
2788 | __releases(rq2->lock) | |
2789 | { | |
9ef7e7e3 | 2790 | if (__rq_lockp(rq1) != __rq_lockp(rq2)) |
5cb9eaa3 | 2791 | raw_spin_rq_unlock(rq2); |
029632fb PZ |
2792 | else |
2793 | __release(rq2->lock); | |
d66f1b06 | 2794 | raw_spin_rq_unlock(rq1); |
029632fb PZ |
2795 | } |
2796 | ||
f2cb1360 IM |
2797 | extern void set_rq_online (struct rq *rq); |
2798 | extern void set_rq_offline(struct rq *rq); | |
2799 | extern bool sched_smp_initialized; | |
2800 | ||
029632fb PZ |
2801 | #else /* CONFIG_SMP */ |
2802 | ||
2803 | /* | |
2804 | * double_rq_lock - safely lock two runqueues | |
2805 | * | |
2806 | * Note this does not disable interrupts like task_rq_lock, | |
2807 | * you need to do so manually before calling. | |
2808 | */ | |
2809 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) | |
2810 | __acquires(rq1->lock) | |
2811 | __acquires(rq2->lock) | |
2812 | { | |
09348d75 IM |
2813 | WARN_ON_ONCE(!irqs_disabled()); |
2814 | WARN_ON_ONCE(rq1 != rq2); | |
5cb9eaa3 | 2815 | raw_spin_rq_lock(rq1); |
029632fb | 2816 | __acquire(rq2->lock); /* Fake it out ;) */ |
2679a837 | 2817 | double_rq_clock_clear_update(rq1, rq2); |
029632fb PZ |
2818 | } |
2819 | ||
2820 | /* | |
2821 | * double_rq_unlock - safely unlock two runqueues | |
2822 | * | |
2823 | * Note this does not restore interrupts like task_rq_unlock, | |
2824 | * you need to do so manually after calling. | |
2825 | */ | |
2826 | static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) | |
2827 | __releases(rq1->lock) | |
2828 | __releases(rq2->lock) | |
2829 | { | |
09348d75 | 2830 | WARN_ON_ONCE(rq1 != rq2); |
5cb9eaa3 | 2831 | raw_spin_rq_unlock(rq1); |
029632fb PZ |
2832 | __release(rq2->lock); |
2833 | } | |
2834 | ||
2835 | #endif | |
2836 | ||
5bb76f1d PZ |
2837 | DEFINE_LOCK_GUARD_2(double_rq_lock, struct rq, |
2838 | double_rq_lock(_T->lock, _T->lock2), | |
2839 | double_rq_unlock(_T->lock, _T->lock2)) | |
2840 | ||
029632fb PZ |
2841 | extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq); |
2842 | extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq); | |
6b55c965 SD |
2843 | |
2844 | #ifdef CONFIG_SCHED_DEBUG | |
9406415f | 2845 | extern bool sched_debug_verbose; |
9469eb01 | 2846 | |
029632fb PZ |
2847 | extern void print_cfs_stats(struct seq_file *m, int cpu); |
2848 | extern void print_rt_stats(struct seq_file *m, int cpu); | |
acb32132 | 2849 | extern void print_dl_stats(struct seq_file *m, int cpu); |
f6a34630 MM |
2850 | extern void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
2851 | extern void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq); | |
2852 | extern void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq); | |
c006fac5 PT |
2853 | |
2854 | extern void resched_latency_warn(int cpu, u64 latency); | |
397f2378 SD |
2855 | #ifdef CONFIG_NUMA_BALANCING |
2856 | extern void | |
2857 | show_numa_stats(struct task_struct *p, struct seq_file *m); | |
2858 | extern void | |
2859 | print_numa_stats(struct seq_file *m, int node, unsigned long tsf, | |
2860 | unsigned long tpf, unsigned long gsf, unsigned long gpf); | |
2861 | #endif /* CONFIG_NUMA_BALANCING */ | |
c006fac5 PT |
2862 | #else |
2863 | static inline void resched_latency_warn(int cpu, u64 latency) {} | |
397f2378 | 2864 | #endif /* CONFIG_SCHED_DEBUG */ |
029632fb PZ |
2865 | |
2866 | extern void init_cfs_rq(struct cfs_rq *cfs_rq); | |
07c54f7a AV |
2867 | extern void init_rt_rq(struct rt_rq *rt_rq); |
2868 | extern void init_dl_rq(struct dl_rq *dl_rq); | |
029632fb | 2869 | |
1ee14e6c BS |
2870 | extern void cfs_bandwidth_usage_inc(void); |
2871 | extern void cfs_bandwidth_usage_dec(void); | |
1c792db7 | 2872 | |
3451d024 | 2873 | #ifdef CONFIG_NO_HZ_COMMON |
00357f5e PZ |
2874 | #define NOHZ_BALANCE_KICK_BIT 0 |
2875 | #define NOHZ_STATS_KICK_BIT 1 | |
c6f88654 | 2876 | #define NOHZ_NEWILB_KICK_BIT 2 |
efd984c4 | 2877 | #define NOHZ_NEXT_KICK_BIT 3 |
a22e47a4 | 2878 | |
efd984c4 | 2879 | /* Run rebalance_domains() */ |
a22e47a4 | 2880 | #define NOHZ_BALANCE_KICK BIT(NOHZ_BALANCE_KICK_BIT) |
efd984c4 | 2881 | /* Update blocked load */ |
b7031a02 | 2882 | #define NOHZ_STATS_KICK BIT(NOHZ_STATS_KICK_BIT) |
efd984c4 | 2883 | /* Update blocked load when entering idle */ |
c6f88654 | 2884 | #define NOHZ_NEWILB_KICK BIT(NOHZ_NEWILB_KICK_BIT) |
efd984c4 VS |
2885 | /* Update nohz.next_balance */ |
2886 | #define NOHZ_NEXT_KICK BIT(NOHZ_NEXT_KICK_BIT) | |
b7031a02 | 2887 | |
efd984c4 | 2888 | #define NOHZ_KICK_MASK (NOHZ_BALANCE_KICK | NOHZ_STATS_KICK | NOHZ_NEXT_KICK) |
1c792db7 SS |
2889 | |
2890 | #define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags) | |
20a5c8cc | 2891 | |
00357f5e | 2892 | extern void nohz_balance_exit_idle(struct rq *rq); |
20a5c8cc | 2893 | #else |
00357f5e | 2894 | static inline void nohz_balance_exit_idle(struct rq *rq) { } |
1c792db7 | 2895 | #endif |
73fbec60 | 2896 | |
c6f88654 VG |
2897 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) |
2898 | extern void nohz_run_idle_balance(int cpu); | |
2899 | #else | |
2900 | static inline void nohz_run_idle_balance(int cpu) { } | |
2901 | #endif | |
daec5798 | 2902 | |
73fbec60 | 2903 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
19d23dbf | 2904 | struct irqtime { |
25e2d8c1 | 2905 | u64 total; |
a499a5a1 | 2906 | u64 tick_delta; |
19d23dbf FW |
2907 | u64 irq_start_time; |
2908 | struct u64_stats_sync sync; | |
2909 | }; | |
73fbec60 | 2910 | |
19d23dbf | 2911 | DECLARE_PER_CPU(struct irqtime, cpu_irqtime); |
73fbec60 | 2912 | |
25e2d8c1 FW |
2913 | /* |
2914 | * Returns the irqtime minus the softirq time computed by ksoftirqd. | |
3b03706f | 2915 | * Otherwise ksoftirqd's sum_exec_runtime is subtracted its own runtime |
25e2d8c1 FW |
2916 | * and never move forward. |
2917 | */ | |
73fbec60 FW |
2918 | static inline u64 irq_time_read(int cpu) |
2919 | { | |
19d23dbf FW |
2920 | struct irqtime *irqtime = &per_cpu(cpu_irqtime, cpu); |
2921 | unsigned int seq; | |
2922 | u64 total; | |
73fbec60 FW |
2923 | |
2924 | do { | |
19d23dbf | 2925 | seq = __u64_stats_fetch_begin(&irqtime->sync); |
25e2d8c1 | 2926 | total = irqtime->total; |
19d23dbf | 2927 | } while (__u64_stats_fetch_retry(&irqtime->sync, seq)); |
73fbec60 | 2928 | |
19d23dbf | 2929 | return total; |
73fbec60 | 2930 | } |
73fbec60 | 2931 | #endif /* CONFIG_IRQ_TIME_ACCOUNTING */ |
adaf9fcd RW |
2932 | |
2933 | #ifdef CONFIG_CPU_FREQ | |
b10abd0a | 2934 | DECLARE_PER_CPU(struct update_util_data __rcu *, cpufreq_update_util_data); |
adaf9fcd RW |
2935 | |
2936 | /** | |
2937 | * cpufreq_update_util - Take a note about CPU utilization changes. | |
12bde33d | 2938 | * @rq: Runqueue to carry out the update for. |
58919e83 | 2939 | * @flags: Update reason flags. |
adaf9fcd | 2940 | * |
58919e83 RW |
2941 | * This function is called by the scheduler on the CPU whose utilization is |
2942 | * being updated. | |
adaf9fcd RW |
2943 | * |
2944 | * It can only be called from RCU-sched read-side critical sections. | |
adaf9fcd RW |
2945 | * |
2946 | * The way cpufreq is currently arranged requires it to evaluate the CPU | |
2947 | * performance state (frequency/voltage) on a regular basis to prevent it from | |
2948 | * being stuck in a completely inadequate performance level for too long. | |
e0367b12 JL |
2949 | * That is not guaranteed to happen if the updates are only triggered from CFS |
2950 | * and DL, though, because they may not be coming in if only RT tasks are | |
2951 | * active all the time (or there are RT tasks only). | |
adaf9fcd | 2952 | * |
e0367b12 JL |
2953 | * As a workaround for that issue, this function is called periodically by the |
2954 | * RT sched class to trigger extra cpufreq updates to prevent it from stalling, | |
adaf9fcd | 2955 | * but that really is a band-aid. Going forward it should be replaced with |
e0367b12 | 2956 | * solutions targeted more specifically at RT tasks. |
adaf9fcd | 2957 | */ |
12bde33d | 2958 | static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) |
adaf9fcd | 2959 | { |
58919e83 RW |
2960 | struct update_util_data *data; |
2961 | ||
674e7541 VK |
2962 | data = rcu_dereference_sched(*per_cpu_ptr(&cpufreq_update_util_data, |
2963 | cpu_of(rq))); | |
58919e83 | 2964 | if (data) |
12bde33d RW |
2965 | data->func(data, rq_clock(rq), flags); |
2966 | } | |
adaf9fcd | 2967 | #else |
12bde33d | 2968 | static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {} |
adaf9fcd | 2969 | #endif /* CONFIG_CPU_FREQ */ |
be53f58f | 2970 | |
9bdcb44e | 2971 | #ifdef arch_scale_freq_capacity |
97fb7a0a IM |
2972 | # ifndef arch_scale_freq_invariant |
2973 | # define arch_scale_freq_invariant() true | |
2974 | # endif | |
2975 | #else | |
2976 | # define arch_scale_freq_invariant() false | |
9bdcb44e | 2977 | #endif |
d4edd662 | 2978 | |
10a35e68 VG |
2979 | #ifdef CONFIG_SMP |
2980 | static inline unsigned long capacity_orig_of(int cpu) | |
2981 | { | |
2982 | return cpu_rq(cpu)->cpu_capacity_orig; | |
2983 | } | |
10a35e68 | 2984 | |
938e5e4b | 2985 | /** |
a5418be9 | 2986 | * enum cpu_util_type - CPU utilization type |
938e5e4b QP |
2987 | * @FREQUENCY_UTIL: Utilization used to select frequency |
2988 | * @ENERGY_UTIL: Utilization used during energy calculation | |
2989 | * | |
2990 | * The utilization signals of all scheduling classes (CFS/RT/DL) and IRQ time | |
2991 | * need to be aggregated differently depending on the usage made of them. This | |
a5418be9 | 2992 | * enum is used within effective_cpu_util() to differentiate the types of |
938e5e4b QP |
2993 | * utilization expected by the callers, and adjust the aggregation accordingly. |
2994 | */ | |
a5418be9 | 2995 | enum cpu_util_type { |
938e5e4b QP |
2996 | FREQUENCY_UTIL, |
2997 | ENERGY_UTIL, | |
2998 | }; | |
2999 | ||
a5418be9 | 3000 | unsigned long effective_cpu_util(int cpu, unsigned long util_cfs, |
bb447999 | 3001 | enum cpu_util_type type, |
af24bde8 | 3002 | struct task_struct *p); |
938e5e4b | 3003 | |
b3f53daa DE |
3004 | /* |
3005 | * Verify the fitness of task @p to run on @cpu taking into account the | |
3006 | * CPU original capacity and the runtime/deadline ratio of the task. | |
3007 | * | |
3008 | * The function will return true if the original capacity of @cpu is | |
3009 | * greater than or equal to task's deadline density right shifted by | |
3010 | * (BW_SHIFT - SCHED_CAPACITY_SHIFT) and false otherwise. | |
3011 | */ | |
3012 | static inline bool dl_task_fits_capacity(struct task_struct *p, int cpu) | |
3013 | { | |
3014 | unsigned long cap = arch_scale_cpu_capacity(cpu); | |
3015 | ||
3016 | return cap >= p->dl.dl_density >> (BW_SHIFT - SCHED_CAPACITY_SHIFT); | |
3017 | } | |
3018 | ||
8cc90515 | 3019 | static inline unsigned long cpu_bw_dl(struct rq *rq) |
d4edd662 JL |
3020 | { |
3021 | return (rq->dl.running_bw * SCHED_CAPACITY_SCALE) >> BW_SHIFT; | |
3022 | } | |
3023 | ||
8cc90515 VG |
3024 | static inline unsigned long cpu_util_dl(struct rq *rq) |
3025 | { | |
3026 | return READ_ONCE(rq->avg_dl.util_avg); | |
3027 | } | |
3028 | ||
a07630b8 | 3029 | |
3eb6d6ec | 3030 | extern unsigned long cpu_util_cfs(int cpu); |
7d0583cf | 3031 | extern unsigned long cpu_util_cfs_boost(int cpu); |
371bf427 VG |
3032 | |
3033 | static inline unsigned long cpu_util_rt(struct rq *rq) | |
3034 | { | |
dfa444dc | 3035 | return READ_ONCE(rq->avg_rt.util_avg); |
371bf427 | 3036 | } |
7d6a905f | 3037 | #endif |
9033ea11 | 3038 | |
7a17e1db QY |
3039 | #ifdef CONFIG_UCLAMP_TASK |
3040 | unsigned long uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id); | |
3041 | ||
24422603 QY |
3042 | static inline unsigned long uclamp_rq_get(struct rq *rq, |
3043 | enum uclamp_id clamp_id) | |
3044 | { | |
3045 | return READ_ONCE(rq->uclamp[clamp_id].value); | |
3046 | } | |
3047 | ||
3048 | static inline void uclamp_rq_set(struct rq *rq, enum uclamp_id clamp_id, | |
3049 | unsigned int value) | |
3050 | { | |
3051 | WRITE_ONCE(rq->uclamp[clamp_id].value, value); | |
3052 | } | |
3053 | ||
3054 | static inline bool uclamp_rq_is_idle(struct rq *rq) | |
3055 | { | |
3056 | return rq->uclamp_flags & UCLAMP_FLAG_IDLE; | |
3057 | } | |
3058 | ||
7a17e1db QY |
3059 | /** |
3060 | * uclamp_rq_util_with - clamp @util with @rq and @p effective uclamp values. | |
3061 | * @rq: The rq to clamp against. Must not be NULL. | |
3062 | * @util: The util value to clamp. | |
3063 | * @p: The task to clamp against. Can be NULL if you want to clamp | |
3064 | * against @rq only. | |
3065 | * | |
3066 | * Clamps the passed @util to the max(@rq, @p) effective uclamp values. | |
3067 | * | |
3068 | * If sched_uclamp_used static key is disabled, then just return the util | |
3069 | * without any clamping since uclamp aggregation at the rq level in the fast | |
3070 | * path is disabled, rendering this operation a NOP. | |
3071 | * | |
3072 | * Use uclamp_eff_value() if you don't care about uclamp values at rq level. It | |
3073 | * will return the correct effective uclamp value of the task even if the | |
3074 | * static key is disabled. | |
3075 | */ | |
3076 | static __always_inline | |
3077 | unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util, | |
3078 | struct task_struct *p) | |
3079 | { | |
3080 | unsigned long min_util = 0; | |
3081 | unsigned long max_util = 0; | |
3082 | ||
3083 | if (!static_branch_likely(&sched_uclamp_used)) | |
3084 | return util; | |
3085 | ||
3086 | if (p) { | |
3087 | min_util = uclamp_eff_value(p, UCLAMP_MIN); | |
3088 | max_util = uclamp_eff_value(p, UCLAMP_MAX); | |
3089 | ||
3090 | /* | |
3091 | * Ignore last runnable task's max clamp, as this task will | |
3092 | * reset it. Similarly, no need to read the rq's min clamp. | |
3093 | */ | |
24422603 | 3094 | if (uclamp_rq_is_idle(rq)) |
7a17e1db QY |
3095 | goto out; |
3096 | } | |
3097 | ||
24422603 QY |
3098 | min_util = max_t(unsigned long, min_util, uclamp_rq_get(rq, UCLAMP_MIN)); |
3099 | max_util = max_t(unsigned long, max_util, uclamp_rq_get(rq, UCLAMP_MAX)); | |
7a17e1db QY |
3100 | out: |
3101 | /* | |
3102 | * Since CPU's {min,max}_util clamps are MAX aggregated considering | |
3103 | * RUNNABLE tasks with _different_ clamps, we can end up with an | |
3104 | * inversion. Fix it now when the clamps are applied. | |
3105 | */ | |
3106 | if (unlikely(min_util >= max_util)) | |
3107 | return min_util; | |
3108 | ||
3109 | return clamp(util, min_util, max_util); | |
3110 | } | |
3111 | ||
3112 | /* Is the rq being capped/throttled by uclamp_max? */ | |
3113 | static inline bool uclamp_rq_is_capped(struct rq *rq) | |
3114 | { | |
3115 | unsigned long rq_util; | |
3116 | unsigned long max_util; | |
3117 | ||
3118 | if (!static_branch_likely(&sched_uclamp_used)) | |
3119 | return false; | |
3120 | ||
3121 | rq_util = cpu_util_cfs(cpu_of(rq)) + cpu_util_rt(rq); | |
3122 | max_util = READ_ONCE(rq->uclamp[UCLAMP_MAX].value); | |
3123 | ||
3124 | return max_util != SCHED_CAPACITY_SCALE && rq_util >= max_util; | |
3125 | } | |
3126 | ||
3127 | /* | |
3128 | * When uclamp is compiled in, the aggregation at rq level is 'turned off' | |
3129 | * by default in the fast path and only gets turned on once userspace performs | |
3130 | * an operation that requires it. | |
3131 | * | |
3132 | * Returns true if userspace opted-in to use uclamp and aggregation at rq level | |
3133 | * hence is active. | |
3134 | */ | |
3135 | static inline bool uclamp_is_used(void) | |
3136 | { | |
3137 | return static_branch_likely(&sched_uclamp_used); | |
3138 | } | |
3139 | #else /* CONFIG_UCLAMP_TASK */ | |
b48e16a6 QY |
3140 | static inline unsigned long uclamp_eff_value(struct task_struct *p, |
3141 | enum uclamp_id clamp_id) | |
3142 | { | |
3143 | if (clamp_id == UCLAMP_MIN) | |
3144 | return 0; | |
3145 | ||
3146 | return SCHED_CAPACITY_SCALE; | |
3147 | } | |
3148 | ||
7a17e1db QY |
3149 | static inline |
3150 | unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util, | |
3151 | struct task_struct *p) | |
3152 | { | |
3153 | return util; | |
3154 | } | |
3155 | ||
3156 | static inline bool uclamp_rq_is_capped(struct rq *rq) { return false; } | |
3157 | ||
3158 | static inline bool uclamp_is_used(void) | |
3159 | { | |
3160 | return false; | |
3161 | } | |
24422603 QY |
3162 | |
3163 | static inline unsigned long uclamp_rq_get(struct rq *rq, | |
3164 | enum uclamp_id clamp_id) | |
3165 | { | |
3166 | if (clamp_id == UCLAMP_MIN) | |
3167 | return 0; | |
3168 | ||
3169 | return SCHED_CAPACITY_SCALE; | |
3170 | } | |
3171 | ||
3172 | static inline void uclamp_rq_set(struct rq *rq, enum uclamp_id clamp_id, | |
3173 | unsigned int value) | |
3174 | { | |
3175 | } | |
3176 | ||
3177 | static inline bool uclamp_rq_is_idle(struct rq *rq) | |
3178 | { | |
3179 | return false; | |
3180 | } | |
7a17e1db QY |
3181 | #endif /* CONFIG_UCLAMP_TASK */ |
3182 | ||
11d4afd4 | 3183 | #ifdef CONFIG_HAVE_SCHED_AVG_IRQ |
9033ea11 VG |
3184 | static inline unsigned long cpu_util_irq(struct rq *rq) |
3185 | { | |
3186 | return rq->avg_irq.util_avg; | |
3187 | } | |
2e62c474 VG |
3188 | |
3189 | static inline | |
3190 | unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned long max) | |
3191 | { | |
3192 | util *= (max - irq); | |
3193 | util /= max; | |
3194 | ||
3195 | return util; | |
3196 | ||
3197 | } | |
9033ea11 VG |
3198 | #else |
3199 | static inline unsigned long cpu_util_irq(struct rq *rq) | |
3200 | { | |
3201 | return 0; | |
3202 | } | |
3203 | ||
2e62c474 VG |
3204 | static inline |
3205 | unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned long max) | |
3206 | { | |
3207 | return util; | |
3208 | } | |
794a56eb | 3209 | #endif |
6aa140fa | 3210 | |
531b5c9f | 3211 | #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) |
f8a696f2 | 3212 | |
6aa140fa | 3213 | #define perf_domain_span(pd) (to_cpumask(((pd)->em_pd->cpus))) |
f8a696f2 PZ |
3214 | |
3215 | DECLARE_STATIC_KEY_FALSE(sched_energy_present); | |
3216 | ||
3217 | static inline bool sched_energy_enabled(void) | |
3218 | { | |
3219 | return static_branch_unlikely(&sched_energy_present); | |
3220 | } | |
3221 | ||
3222 | #else /* ! (CONFIG_ENERGY_MODEL && CONFIG_CPU_FREQ_GOV_SCHEDUTIL) */ | |
3223 | ||
6aa140fa | 3224 | #define perf_domain_span(pd) NULL |
f8a696f2 | 3225 | static inline bool sched_energy_enabled(void) { return false; } |
1f74de87 | 3226 | |
f8a696f2 | 3227 | #endif /* CONFIG_ENERGY_MODEL && CONFIG_CPU_FREQ_GOV_SCHEDUTIL */ |
227a4aad MD |
3228 | |
3229 | #ifdef CONFIG_MEMBARRIER | |
3230 | /* | |
3231 | * The scheduler provides memory barriers required by membarrier between: | |
3232 | * - prior user-space memory accesses and store to rq->membarrier_state, | |
3233 | * - store to rq->membarrier_state and following user-space memory accesses. | |
3234 | * In the same way it provides those guarantees around store to rq->curr. | |
3235 | */ | |
3236 | static inline void membarrier_switch_mm(struct rq *rq, | |
3237 | struct mm_struct *prev_mm, | |
3238 | struct mm_struct *next_mm) | |
3239 | { | |
3240 | int membarrier_state; | |
3241 | ||
3242 | if (prev_mm == next_mm) | |
3243 | return; | |
3244 | ||
3245 | membarrier_state = atomic_read(&next_mm->membarrier_state); | |
3246 | if (READ_ONCE(rq->membarrier_state) == membarrier_state) | |
3247 | return; | |
3248 | ||
3249 | WRITE_ONCE(rq->membarrier_state, membarrier_state); | |
3250 | } | |
3251 | #else | |
3252 | static inline void membarrier_switch_mm(struct rq *rq, | |
3253 | struct mm_struct *prev_mm, | |
3254 | struct mm_struct *next_mm) | |
3255 | { | |
3256 | } | |
3257 | #endif | |
52262ee5 MG |
3258 | |
3259 | #ifdef CONFIG_SMP | |
3260 | static inline bool is_per_cpu_kthread(struct task_struct *p) | |
3261 | { | |
3262 | if (!(p->flags & PF_KTHREAD)) | |
3263 | return false; | |
3264 | ||
3265 | if (p->nr_cpus_allowed != 1) | |
3266 | return false; | |
3267 | ||
3268 | return true; | |
3269 | } | |
3270 | #endif | |
b3212fe2 | 3271 | |
1011dcce PZ |
3272 | extern void swake_up_all_locked(struct swait_queue_head *q); |
3273 | extern void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait); | |
3274 | ||
ab83f455 PO |
3275 | extern int try_to_wake_up(struct task_struct *tsk, unsigned int state, int wake_flags); |
3276 | ||
1011dcce PZ |
3277 | #ifdef CONFIG_PREEMPT_DYNAMIC |
3278 | extern int preempt_dynamic_mode; | |
3279 | extern int sched_dynamic_mode(const char *str); | |
3280 | extern void sched_dynamic_update(int mode); | |
3281 | #endif | |
3282 | ||
5531ecff SX |
3283 | static inline void update_current_exec_runtime(struct task_struct *curr, |
3284 | u64 now, u64 delta_exec) | |
3285 | { | |
3286 | curr->se.sum_exec_runtime += delta_exec; | |
3287 | account_group_exec_runtime(curr, delta_exec); | |
3288 | ||
3289 | curr->se.exec_start = now; | |
3290 | cgroup_account_cputime(curr, delta_exec); | |
3291 | } | |
3292 | ||
af7f588d | 3293 | #ifdef CONFIG_SCHED_MM_CID |
223baf9d MD |
3294 | |
3295 | #define SCHED_MM_CID_PERIOD_NS (100ULL * 1000000) /* 100ms */ | |
3296 | #define MM_CID_SCAN_DELAY 100 /* 100ms */ | |
3297 | ||
3298 | extern raw_spinlock_t cid_lock; | |
3299 | extern int use_cid_lock; | |
3300 | ||
3301 | extern void sched_mm_cid_migrate_from(struct task_struct *t); | |
3302 | extern void sched_mm_cid_migrate_to(struct rq *dst_rq, struct task_struct *t); | |
3303 | extern void task_tick_mm_cid(struct rq *rq, struct task_struct *curr); | |
3304 | extern void init_sched_mm_cid(struct task_struct *t); | |
3305 | ||
3306 | static inline void __mm_cid_put(struct mm_struct *mm, int cid) | |
3307 | { | |
3308 | if (cid < 0) | |
3309 | return; | |
3310 | cpumask_clear_cpu(cid, mm_cidmask(mm)); | |
3311 | } | |
3312 | ||
3313 | /* | |
3314 | * The per-mm/cpu cid can have the MM_CID_LAZY_PUT flag set or transition to | |
3315 | * the MM_CID_UNSET state without holding the rq lock, but the rq lock needs to | |
3316 | * be held to transition to other states. | |
3317 | * | |
3318 | * State transitions synchronized with cmpxchg or try_cmpxchg need to be | |
3319 | * consistent across cpus, which prevents use of this_cpu_cmpxchg. | |
3320 | */ | |
3321 | static inline void mm_cid_put_lazy(struct task_struct *t) | |
3322 | { | |
3323 | struct mm_struct *mm = t->mm; | |
3324 | struct mm_cid __percpu *pcpu_cid = mm->pcpu_cid; | |
3325 | int cid; | |
3326 | ||
3327 | lockdep_assert_irqs_disabled(); | |
3328 | cid = __this_cpu_read(pcpu_cid->cid); | |
3329 | if (!mm_cid_is_lazy_put(cid) || | |
3330 | !try_cmpxchg(&this_cpu_ptr(pcpu_cid)->cid, &cid, MM_CID_UNSET)) | |
3331 | return; | |
3332 | __mm_cid_put(mm, mm_cid_clear_lazy_put(cid)); | |
3333 | } | |
3334 | ||
3335 | static inline int mm_cid_pcpu_unset(struct mm_struct *mm) | |
3336 | { | |
3337 | struct mm_cid __percpu *pcpu_cid = mm->pcpu_cid; | |
3338 | int cid, res; | |
3339 | ||
3340 | lockdep_assert_irqs_disabled(); | |
3341 | cid = __this_cpu_read(pcpu_cid->cid); | |
3342 | for (;;) { | |
3343 | if (mm_cid_is_unset(cid)) | |
3344 | return MM_CID_UNSET; | |
3345 | /* | |
3346 | * Attempt transition from valid or lazy-put to unset. | |
3347 | */ | |
3348 | res = cmpxchg(&this_cpu_ptr(pcpu_cid)->cid, cid, MM_CID_UNSET); | |
3349 | if (res == cid) | |
3350 | break; | |
3351 | cid = res; | |
3352 | } | |
3353 | return cid; | |
3354 | } | |
3355 | ||
3356 | static inline void mm_cid_put(struct mm_struct *mm) | |
3357 | { | |
3358 | int cid; | |
3359 | ||
3360 | lockdep_assert_irqs_disabled(); | |
3361 | cid = mm_cid_pcpu_unset(mm); | |
3362 | if (cid == MM_CID_UNSET) | |
3363 | return; | |
3364 | __mm_cid_put(mm, mm_cid_clear_lazy_put(cid)); | |
3365 | } | |
3366 | ||
3367 | static inline int __mm_cid_try_get(struct mm_struct *mm) | |
af7f588d MD |
3368 | { |
3369 | struct cpumask *cpumask; | |
3370 | int cid; | |
3371 | ||
3372 | cpumask = mm_cidmask(mm); | |
223baf9d MD |
3373 | /* |
3374 | * Retry finding first zero bit if the mask is temporarily | |
3375 | * filled. This only happens during concurrent remote-clear | |
3376 | * which owns a cid without holding a rq lock. | |
3377 | */ | |
3378 | for (;;) { | |
3379 | cid = cpumask_first_zero(cpumask); | |
3380 | if (cid < nr_cpu_ids) | |
3381 | break; | |
3382 | cpu_relax(); | |
3383 | } | |
3384 | if (cpumask_test_and_set_cpu(cid, cpumask)) | |
af7f588d | 3385 | return -1; |
af7f588d MD |
3386 | return cid; |
3387 | } | |
3388 | ||
223baf9d MD |
3389 | /* |
3390 | * Save a snapshot of the current runqueue time of this cpu | |
3391 | * with the per-cpu cid value, allowing to estimate how recently it was used. | |
3392 | */ | |
3393 | static inline void mm_cid_snapshot_time(struct rq *rq, struct mm_struct *mm) | |
af7f588d | 3394 | { |
223baf9d MD |
3395 | struct mm_cid *pcpu_cid = per_cpu_ptr(mm->pcpu_cid, cpu_of(rq)); |
3396 | ||
3397 | lockdep_assert_rq_held(rq); | |
3398 | WRITE_ONCE(pcpu_cid->time, rq->clock); | |
af7f588d MD |
3399 | } |
3400 | ||
223baf9d | 3401 | static inline int __mm_cid_get(struct rq *rq, struct mm_struct *mm) |
af7f588d | 3402 | { |
223baf9d | 3403 | int cid; |
af7f588d | 3404 | |
223baf9d MD |
3405 | /* |
3406 | * All allocations (even those using the cid_lock) are lock-free. If | |
3407 | * use_cid_lock is set, hold the cid_lock to perform cid allocation to | |
3408 | * guarantee forward progress. | |
3409 | */ | |
3410 | if (!READ_ONCE(use_cid_lock)) { | |
3411 | cid = __mm_cid_try_get(mm); | |
3412 | if (cid >= 0) | |
3413 | goto end; | |
3414 | raw_spin_lock(&cid_lock); | |
3415 | } else { | |
3416 | raw_spin_lock(&cid_lock); | |
3417 | cid = __mm_cid_try_get(mm); | |
3418 | if (cid >= 0) | |
3419 | goto unlock; | |
3420 | } | |
3421 | ||
3422 | /* | |
3423 | * cid concurrently allocated. Retry while forcing following | |
3424 | * allocations to use the cid_lock to ensure forward progress. | |
3425 | */ | |
3426 | WRITE_ONCE(use_cid_lock, 1); | |
3427 | /* | |
3428 | * Set use_cid_lock before allocation. Only care about program order | |
3429 | * because this is only required for forward progress. | |
3430 | */ | |
3431 | barrier(); | |
3432 | /* | |
3433 | * Retry until it succeeds. It is guaranteed to eventually succeed once | |
3434 | * all newcoming allocations observe the use_cid_lock flag set. | |
3435 | */ | |
3436 | do { | |
3437 | cid = __mm_cid_try_get(mm); | |
3438 | cpu_relax(); | |
3439 | } while (cid < 0); | |
3440 | /* | |
3441 | * Allocate before clearing use_cid_lock. Only care about | |
3442 | * program order because this is for forward progress. | |
3443 | */ | |
3444 | barrier(); | |
3445 | WRITE_ONCE(use_cid_lock, 0); | |
3446 | unlock: | |
3447 | raw_spin_unlock(&cid_lock); | |
3448 | end: | |
3449 | mm_cid_snapshot_time(rq, mm); | |
3450 | return cid; | |
af7f588d MD |
3451 | } |
3452 | ||
223baf9d | 3453 | static inline int mm_cid_get(struct rq *rq, struct mm_struct *mm) |
af7f588d | 3454 | { |
223baf9d MD |
3455 | struct mm_cid __percpu *pcpu_cid = mm->pcpu_cid; |
3456 | struct cpumask *cpumask; | |
3457 | int cid; | |
3458 | ||
3459 | lockdep_assert_rq_held(rq); | |
3460 | cpumask = mm_cidmask(mm); | |
3461 | cid = __this_cpu_read(pcpu_cid->cid); | |
3462 | if (mm_cid_is_valid(cid)) { | |
3463 | mm_cid_snapshot_time(rq, mm); | |
3464 | return cid; | |
3465 | } | |
3466 | if (mm_cid_is_lazy_put(cid)) { | |
3467 | if (try_cmpxchg(&this_cpu_ptr(pcpu_cid)->cid, &cid, MM_CID_UNSET)) | |
3468 | __mm_cid_put(mm, mm_cid_clear_lazy_put(cid)); | |
3469 | } | |
3470 | cid = __mm_cid_get(rq, mm); | |
3471 | __this_cpu_write(pcpu_cid->cid, cid); | |
3472 | return cid; | |
3473 | } | |
3474 | ||
3475 | static inline void switch_mm_cid(struct rq *rq, | |
3476 | struct task_struct *prev, | |
3477 | struct task_struct *next) | |
3478 | { | |
3479 | /* | |
3480 | * Provide a memory barrier between rq->curr store and load of | |
3481 | * {prev,next}->mm->pcpu_cid[cpu] on rq->curr->mm transition. | |
3482 | * | |
3483 | * Should be adapted if context_switch() is modified. | |
3484 | */ | |
3485 | if (!next->mm) { // to kernel | |
3486 | /* | |
3487 | * user -> kernel transition does not guarantee a barrier, but | |
3488 | * we can use the fact that it performs an atomic operation in | |
3489 | * mmgrab(). | |
3490 | */ | |
3491 | if (prev->mm) // from user | |
3492 | smp_mb__after_mmgrab(); | |
3493 | /* | |
3494 | * kernel -> kernel transition does not change rq->curr->mm | |
3495 | * state. It stays NULL. | |
3496 | */ | |
3497 | } else { // to user | |
3498 | /* | |
3499 | * kernel -> user transition does not provide a barrier | |
3500 | * between rq->curr store and load of {prev,next}->mm->pcpu_cid[cpu]. | |
3501 | * Provide it here. | |
3502 | */ | |
3503 | if (!prev->mm) // from kernel | |
3504 | smp_mb(); | |
3505 | /* | |
3506 | * user -> user transition guarantees a memory barrier through | |
3507 | * switch_mm() when current->mm changes. If current->mm is | |
3508 | * unchanged, no barrier is needed. | |
3509 | */ | |
3510 | } | |
af7f588d | 3511 | if (prev->mm_cid_active) { |
223baf9d MD |
3512 | mm_cid_snapshot_time(rq, prev->mm); |
3513 | mm_cid_put_lazy(prev); | |
af7f588d MD |
3514 | prev->mm_cid = -1; |
3515 | } | |
3516 | if (next->mm_cid_active) | |
223baf9d | 3517 | next->last_mm_cid = next->mm_cid = mm_cid_get(rq, next->mm); |
af7f588d MD |
3518 | } |
3519 | ||
3520 | #else | |
223baf9d MD |
3521 | static inline void switch_mm_cid(struct rq *rq, struct task_struct *prev, struct task_struct *next) { } |
3522 | static inline void sched_mm_cid_migrate_from(struct task_struct *t) { } | |
3523 | static inline void sched_mm_cid_migrate_to(struct rq *dst_rq, struct task_struct *t) { } | |
3524 | static inline void task_tick_mm_cid(struct rq *rq, struct task_struct *curr) { } | |
3525 | static inline void init_sched_mm_cid(struct task_struct *t) { } | |
af7f588d MD |
3526 | #endif |
3527 | ||
af4cf404 | 3528 | extern u64 avg_vruntime(struct cfs_rq *cfs_rq); |
147f3efa | 3529 | extern int entity_eligible(struct cfs_rq *cfs_rq, struct sched_entity *se); |
af4cf404 | 3530 | |
95458477 | 3531 | #endif /* _KERNEL_SCHED_SCHED_H */ |