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 | */ | |
029632fb | 5 | #include <linux/sched.h> |
325ea10c | 6 | |
dfc3401a | 7 | #include <linux/sched/autogroup.h> |
e6017571 | 8 | #include <linux/sched/clock.h> |
325ea10c | 9 | #include <linux/sched/coredump.h> |
55687da1 | 10 | #include <linux/sched/cpufreq.h> |
325ea10c IM |
11 | #include <linux/sched/cputime.h> |
12 | #include <linux/sched/deadline.h> | |
b17b0153 | 13 | #include <linux/sched/debug.h> |
ef8bd77f | 14 | #include <linux/sched/hotplug.h> |
325ea10c IM |
15 | #include <linux/sched/idle.h> |
16 | #include <linux/sched/init.h> | |
17 | #include <linux/sched/isolation.h> | |
18 | #include <linux/sched/jobctl.h> | |
19 | #include <linux/sched/loadavg.h> | |
20 | #include <linux/sched/mm.h> | |
21 | #include <linux/sched/nohz.h> | |
22 | #include <linux/sched/numa_balancing.h> | |
23 | #include <linux/sched/prio.h> | |
24 | #include <linux/sched/rt.h> | |
25 | #include <linux/sched/signal.h> | |
26 | #include <linux/sched/stat.h> | |
27 | #include <linux/sched/sysctl.h> | |
29930025 | 28 | #include <linux/sched/task.h> |
68db0cf1 | 29 | #include <linux/sched/task_stack.h> |
325ea10c IM |
30 | #include <linux/sched/topology.h> |
31 | #include <linux/sched/user.h> | |
32 | #include <linux/sched/wake_q.h> | |
33 | #include <linux/sched/xacct.h> | |
34 | ||
35 | #include <uapi/linux/sched/types.h> | |
ef8bd77f | 36 | |
3866e845 | 37 | #include <linux/binfmts.h> |
325ea10c IM |
38 | #include <linux/blkdev.h> |
39 | #include <linux/compat.h> | |
40 | #include <linux/context_tracking.h> | |
41 | #include <linux/cpufreq.h> | |
42 | #include <linux/cpuidle.h> | |
43 | #include <linux/cpuset.h> | |
44 | #include <linux/ctype.h> | |
45 | #include <linux/debugfs.h> | |
46 | #include <linux/delayacct.h> | |
47 | #include <linux/init_task.h> | |
48 | #include <linux/kprobes.h> | |
49 | #include <linux/kthread.h> | |
50 | #include <linux/membarrier.h> | |
51 | #include <linux/migrate.h> | |
52 | #include <linux/mmu_context.h> | |
53 | #include <linux/nmi.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/prefetch.h> | |
56 | #include <linux/profile.h> | |
57 | #include <linux/rcupdate_wait.h> | |
58 | #include <linux/security.h> | |
59 | #include <linux/stackprotector.h> | |
029632fb | 60 | #include <linux/stop_machine.h> |
325ea10c IM |
61 | #include <linux/suspend.h> |
62 | #include <linux/swait.h> | |
63 | #include <linux/syscalls.h> | |
64 | #include <linux/task_work.h> | |
65 | #include <linux/tsacct_kern.h> | |
66 | ||
67 | #include <asm/tlb.h> | |
029632fb | 68 | |
7fce777c | 69 | #ifdef CONFIG_PARAVIRT |
325ea10c | 70 | # include <asm/paravirt.h> |
7fce777c IM |
71 | #endif |
72 | ||
391e43da | 73 | #include "cpupri.h" |
6bfd6d72 | 74 | #include "cpudeadline.h" |
029632fb | 75 | |
9148a3a1 | 76 | #ifdef CONFIG_SCHED_DEBUG |
6d3aed3d | 77 | # define SCHED_WARN_ON(x) WARN_ONCE(x, #x) |
9148a3a1 | 78 | #else |
6d3aed3d | 79 | # define SCHED_WARN_ON(x) ({ (void)(x), 0; }) |
9148a3a1 PZ |
80 | #endif |
81 | ||
45ceebf7 | 82 | struct rq; |
442bf3aa | 83 | struct cpuidle_state; |
45ceebf7 | 84 | |
da0c1e65 KT |
85 | /* task_struct::on_rq states: */ |
86 | #define TASK_ON_RQ_QUEUED 1 | |
cca26e80 | 87 | #define TASK_ON_RQ_MIGRATING 2 |
da0c1e65 | 88 | |
029632fb PZ |
89 | extern __read_mostly int scheduler_running; |
90 | ||
45ceebf7 PG |
91 | extern unsigned long calc_load_update; |
92 | extern atomic_long_t calc_load_tasks; | |
93 | ||
3289bdb4 | 94 | extern void calc_global_load_tick(struct rq *this_rq); |
d60585c5 | 95 | extern long calc_load_fold_active(struct rq *this_rq, long adjust); |
3289bdb4 PZ |
96 | |
97 | #ifdef CONFIG_SMP | |
cee1afce | 98 | extern void cpu_load_update_active(struct rq *this_rq); |
3289bdb4 | 99 | #else |
cee1afce | 100 | static inline void cpu_load_update_active(struct rq *this_rq) { } |
3289bdb4 | 101 | #endif |
45ceebf7 | 102 | |
029632fb PZ |
103 | /* |
104 | * Helpers for converting nanosecond timing to jiffy resolution | |
105 | */ | |
106 | #define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ)) | |
107 | ||
cc1f4b1f LZ |
108 | /* |
109 | * Increase resolution of nice-level calculations for 64-bit architectures. | |
110 | * The extra resolution improves shares distribution and load balancing of | |
111 | * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup | |
112 | * hierarchies, especially on larger systems. This is not a user-visible change | |
113 | * and does not change the user-interface for setting shares/weights. | |
114 | * | |
115 | * We increase resolution only if we have enough bits to allow this increased | |
97fb7a0a IM |
116 | * resolution (i.e. 64-bit). The costs for increasing resolution when 32-bit |
117 | * are pretty high and the returns do not justify the increased costs. | |
2159197d | 118 | * |
97fb7a0a IM |
119 | * Really only required when CONFIG_FAIR_GROUP_SCHED=y is also set, but to |
120 | * increase coverage and consistency always enable it on 64-bit platforms. | |
cc1f4b1f | 121 | */ |
2159197d | 122 | #ifdef CONFIG_64BIT |
172895e6 | 123 | # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT + SCHED_FIXEDPOINT_SHIFT) |
6ecdd749 YD |
124 | # define scale_load(w) ((w) << SCHED_FIXEDPOINT_SHIFT) |
125 | # define scale_load_down(w) ((w) >> SCHED_FIXEDPOINT_SHIFT) | |
cc1f4b1f | 126 | #else |
172895e6 | 127 | # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT) |
cc1f4b1f LZ |
128 | # define scale_load(w) (w) |
129 | # define scale_load_down(w) (w) | |
130 | #endif | |
131 | ||
6ecdd749 | 132 | /* |
172895e6 YD |
133 | * Task weight (visible to users) and its load (invisible to users) have |
134 | * independent resolution, but they should be well calibrated. We use | |
135 | * scale_load() and scale_load_down(w) to convert between them. The | |
136 | * following must be true: | |
137 | * | |
138 | * scale_load(sched_prio_to_weight[USER_PRIO(NICE_TO_PRIO(0))]) == NICE_0_LOAD | |
139 | * | |
6ecdd749 | 140 | */ |
172895e6 | 141 | #define NICE_0_LOAD (1L << NICE_0_LOAD_SHIFT) |
029632fb | 142 | |
332ac17e DF |
143 | /* |
144 | * Single value that decides SCHED_DEADLINE internal math precision. | |
145 | * 10 -> just above 1us | |
146 | * 9 -> just above 0.5us | |
147 | */ | |
97fb7a0a | 148 | #define DL_SCALE 10 |
029632fb PZ |
149 | |
150 | /* | |
97fb7a0a | 151 | * Single value that denotes runtime == period, ie unlimited time. |
029632fb | 152 | */ |
97fb7a0a | 153 | #define RUNTIME_INF ((u64)~0ULL) |
029632fb | 154 | |
20f9cd2a HA |
155 | static inline int idle_policy(int policy) |
156 | { | |
157 | return policy == SCHED_IDLE; | |
158 | } | |
d50dde5a DF |
159 | static inline int fair_policy(int policy) |
160 | { | |
161 | return policy == SCHED_NORMAL || policy == SCHED_BATCH; | |
162 | } | |
163 | ||
029632fb PZ |
164 | static inline int rt_policy(int policy) |
165 | { | |
d50dde5a | 166 | return policy == SCHED_FIFO || policy == SCHED_RR; |
029632fb PZ |
167 | } |
168 | ||
aab03e05 DF |
169 | static inline int dl_policy(int policy) |
170 | { | |
171 | return policy == SCHED_DEADLINE; | |
172 | } | |
20f9cd2a HA |
173 | static inline bool valid_policy(int policy) |
174 | { | |
175 | return idle_policy(policy) || fair_policy(policy) || | |
176 | rt_policy(policy) || dl_policy(policy); | |
177 | } | |
aab03e05 | 178 | |
029632fb PZ |
179 | static inline int task_has_rt_policy(struct task_struct *p) |
180 | { | |
181 | return rt_policy(p->policy); | |
182 | } | |
183 | ||
aab03e05 DF |
184 | static inline int task_has_dl_policy(struct task_struct *p) |
185 | { | |
186 | return dl_policy(p->policy); | |
187 | } | |
188 | ||
07881166 JL |
189 | #define cap_scale(v, s) ((v)*(s) >> SCHED_CAPACITY_SHIFT) |
190 | ||
794a56eb JL |
191 | /* |
192 | * !! For sched_setattr_nocheck() (kernel) only !! | |
193 | * | |
194 | * This is actually gross. :( | |
195 | * | |
196 | * It is used to make schedutil kworker(s) higher priority than SCHED_DEADLINE | |
197 | * tasks, but still be able to sleep. We need this on platforms that cannot | |
198 | * atomically change clock frequency. Remove once fast switching will be | |
199 | * available on such platforms. | |
200 | * | |
201 | * SUGOV stands for SchedUtil GOVernor. | |
202 | */ | |
203 | #define SCHED_FLAG_SUGOV 0x10000000 | |
204 | ||
205 | static inline bool dl_entity_is_special(struct sched_dl_entity *dl_se) | |
206 | { | |
207 | #ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL | |
208 | return unlikely(dl_se->flags & SCHED_FLAG_SUGOV); | |
209 | #else | |
210 | return false; | |
211 | #endif | |
212 | } | |
213 | ||
2d3d891d DF |
214 | /* |
215 | * Tells if entity @a should preempt entity @b. | |
216 | */ | |
332ac17e DF |
217 | static inline bool |
218 | dl_entity_preempt(struct sched_dl_entity *a, struct sched_dl_entity *b) | |
2d3d891d | 219 | { |
794a56eb JL |
220 | return dl_entity_is_special(a) || |
221 | dl_time_before(a->deadline, b->deadline); | |
2d3d891d DF |
222 | } |
223 | ||
029632fb PZ |
224 | /* |
225 | * This is the priority-queue data structure of the RT scheduling class: | |
226 | */ | |
227 | struct rt_prio_array { | |
228 | DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */ | |
229 | struct list_head queue[MAX_RT_PRIO]; | |
230 | }; | |
231 | ||
232 | struct rt_bandwidth { | |
233 | /* nests inside the rq lock: */ | |
234 | raw_spinlock_t rt_runtime_lock; | |
235 | ktime_t rt_period; | |
236 | u64 rt_runtime; | |
237 | struct hrtimer rt_period_timer; | |
4cfafd30 | 238 | unsigned int rt_period_active; |
029632fb | 239 | }; |
a5e7be3b JL |
240 | |
241 | void __dl_clear_params(struct task_struct *p); | |
242 | ||
332ac17e DF |
243 | /* |
244 | * To keep the bandwidth of -deadline tasks and groups under control | |
245 | * we need some place where: | |
246 | * - store the maximum -deadline bandwidth of the system (the group); | |
247 | * - cache the fraction of that bandwidth that is currently allocated. | |
248 | * | |
249 | * This is all done in the data structure below. It is similar to the | |
250 | * one used for RT-throttling (rt_bandwidth), with the main difference | |
251 | * that, since here we are only interested in admission control, we | |
252 | * do not decrease any runtime while the group "executes", neither we | |
253 | * need a timer to replenish it. | |
254 | * | |
255 | * With respect to SMP, the bandwidth is given on a per-CPU basis, | |
256 | * meaning that: | |
257 | * - dl_bw (< 100%) is the bandwidth of the system (group) on each CPU; | |
258 | * - dl_total_bw array contains, in the i-eth element, the currently | |
259 | * allocated bandwidth on the i-eth CPU. | |
260 | * Moreover, groups consume bandwidth on each CPU, while tasks only | |
261 | * consume bandwidth on the CPU they're running on. | |
262 | * Finally, dl_total_bw_cpu is used to cache the index of dl_total_bw | |
263 | * that will be shown the next time the proc or cgroup controls will | |
264 | * be red. It on its turn can be changed by writing on its own | |
265 | * control. | |
266 | */ | |
267 | struct dl_bandwidth { | |
97fb7a0a IM |
268 | raw_spinlock_t dl_runtime_lock; |
269 | u64 dl_runtime; | |
270 | u64 dl_period; | |
332ac17e DF |
271 | }; |
272 | ||
273 | static inline int dl_bandwidth_enabled(void) | |
274 | { | |
1724813d | 275 | return sysctl_sched_rt_runtime >= 0; |
332ac17e DF |
276 | } |
277 | ||
332ac17e | 278 | struct dl_bw { |
97fb7a0a IM |
279 | raw_spinlock_t lock; |
280 | u64 bw; | |
281 | u64 total_bw; | |
332ac17e DF |
282 | }; |
283 | ||
daec5798 LA |
284 | static inline void __dl_update(struct dl_bw *dl_b, s64 bw); |
285 | ||
7f51412a | 286 | static inline |
8c0944ce | 287 | void __dl_sub(struct dl_bw *dl_b, u64 tsk_bw, int cpus) |
7f51412a JL |
288 | { |
289 | dl_b->total_bw -= tsk_bw; | |
daec5798 | 290 | __dl_update(dl_b, (s32)tsk_bw / cpus); |
7f51412a JL |
291 | } |
292 | ||
293 | static inline | |
daec5798 | 294 | void __dl_add(struct dl_bw *dl_b, u64 tsk_bw, int cpus) |
7f51412a JL |
295 | { |
296 | dl_b->total_bw += tsk_bw; | |
daec5798 | 297 | __dl_update(dl_b, -((s32)tsk_bw / cpus)); |
7f51412a JL |
298 | } |
299 | ||
300 | static inline | |
301 | bool __dl_overflow(struct dl_bw *dl_b, int cpus, u64 old_bw, u64 new_bw) | |
302 | { | |
303 | return dl_b->bw != -1 && | |
304 | dl_b->bw * cpus < dl_b->total_bw - old_bw + new_bw; | |
305 | } | |
306 | ||
97fb7a0a | 307 | extern void dl_change_utilization(struct task_struct *p, u64 new_bw); |
f2cb1360 | 308 | extern void init_dl_bw(struct dl_bw *dl_b); |
97fb7a0a | 309 | extern int sched_dl_global_validate(void); |
06a76fe0 | 310 | extern void sched_dl_do_global(void); |
97fb7a0a | 311 | extern int sched_dl_overflow(struct task_struct *p, int policy, const struct sched_attr *attr); |
06a76fe0 NP |
312 | extern void __setparam_dl(struct task_struct *p, const struct sched_attr *attr); |
313 | extern void __getparam_dl(struct task_struct *p, struct sched_attr *attr); | |
314 | extern bool __checkparam_dl(const struct sched_attr *attr); | |
06a76fe0 | 315 | extern bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr); |
97fb7a0a IM |
316 | extern int dl_task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed); |
317 | extern int dl_cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial); | |
06a76fe0 | 318 | extern bool dl_cpu_busy(unsigned int cpu); |
029632fb PZ |
319 | |
320 | #ifdef CONFIG_CGROUP_SCHED | |
321 | ||
322 | #include <linux/cgroup.h> | |
323 | ||
324 | struct cfs_rq; | |
325 | struct rt_rq; | |
326 | ||
35cf4e50 | 327 | extern struct list_head task_groups; |
029632fb PZ |
328 | |
329 | struct cfs_bandwidth { | |
330 | #ifdef CONFIG_CFS_BANDWIDTH | |
97fb7a0a IM |
331 | raw_spinlock_t lock; |
332 | ktime_t period; | |
333 | u64 quota; | |
334 | u64 runtime; | |
335 | s64 hierarchical_quota; | |
336 | u64 runtime_expires; | |
337 | ||
338 | int idle; | |
339 | int period_active; | |
340 | struct hrtimer period_timer; | |
341 | struct hrtimer slack_timer; | |
342 | struct list_head throttled_cfs_rq; | |
343 | ||
344 | /* Statistics: */ | |
345 | int nr_periods; | |
346 | int nr_throttled; | |
347 | u64 throttled_time; | |
029632fb PZ |
348 | #endif |
349 | }; | |
350 | ||
97fb7a0a | 351 | /* Task group related information */ |
029632fb PZ |
352 | struct task_group { |
353 | struct cgroup_subsys_state css; | |
354 | ||
355 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
97fb7a0a IM |
356 | /* schedulable entities of this group on each CPU */ |
357 | struct sched_entity **se; | |
358 | /* runqueue "owned" by this group on each CPU */ | |
359 | struct cfs_rq **cfs_rq; | |
360 | unsigned long shares; | |
029632fb | 361 | |
fa6bddeb | 362 | #ifdef CONFIG_SMP |
b0367629 WL |
363 | /* |
364 | * load_avg can be heavily contended at clock tick time, so put | |
365 | * it in its own cacheline separated from the fields above which | |
366 | * will also be accessed at each tick. | |
367 | */ | |
97fb7a0a | 368 | atomic_long_t load_avg ____cacheline_aligned; |
029632fb | 369 | #endif |
fa6bddeb | 370 | #endif |
029632fb PZ |
371 | |
372 | #ifdef CONFIG_RT_GROUP_SCHED | |
97fb7a0a IM |
373 | struct sched_rt_entity **rt_se; |
374 | struct rt_rq **rt_rq; | |
029632fb | 375 | |
97fb7a0a | 376 | struct rt_bandwidth rt_bandwidth; |
029632fb PZ |
377 | #endif |
378 | ||
97fb7a0a IM |
379 | struct rcu_head rcu; |
380 | struct list_head list; | |
029632fb | 381 | |
97fb7a0a IM |
382 | struct task_group *parent; |
383 | struct list_head siblings; | |
384 | struct list_head children; | |
029632fb PZ |
385 | |
386 | #ifdef CONFIG_SCHED_AUTOGROUP | |
97fb7a0a | 387 | struct autogroup *autogroup; |
029632fb PZ |
388 | #endif |
389 | ||
97fb7a0a | 390 | struct cfs_bandwidth cfs_bandwidth; |
029632fb PZ |
391 | }; |
392 | ||
393 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
394 | #define ROOT_TASK_GROUP_LOAD NICE_0_LOAD | |
395 | ||
396 | /* | |
397 | * A weight of 0 or 1 can cause arithmetics problems. | |
398 | * A weight of a cfs_rq is the sum of weights of which entities | |
399 | * are queued on this cfs_rq, so a weight of a entity should not be | |
400 | * too large, so as the shares value of a task group. | |
401 | * (The default weight is 1024 - so there's no practical | |
402 | * limitation from this.) | |
403 | */ | |
97fb7a0a IM |
404 | #define MIN_SHARES (1UL << 1) |
405 | #define MAX_SHARES (1UL << 18) | |
029632fb PZ |
406 | #endif |
407 | ||
029632fb PZ |
408 | typedef int (*tg_visitor)(struct task_group *, void *); |
409 | ||
410 | extern int walk_tg_tree_from(struct task_group *from, | |
411 | tg_visitor down, tg_visitor up, void *data); | |
412 | ||
413 | /* | |
414 | * Iterate the full tree, calling @down when first entering a node and @up when | |
415 | * leaving it for the final time. | |
416 | * | |
417 | * Caller must hold rcu_lock or sufficient equivalent. | |
418 | */ | |
419 | static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data) | |
420 | { | |
421 | return walk_tg_tree_from(&root_task_group, down, up, data); | |
422 | } | |
423 | ||
424 | extern int tg_nop(struct task_group *tg, void *data); | |
425 | ||
426 | extern void free_fair_sched_group(struct task_group *tg); | |
427 | extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent); | |
8663e24d | 428 | extern void online_fair_sched_group(struct task_group *tg); |
6fe1f348 | 429 | extern void unregister_fair_sched_group(struct task_group *tg); |
029632fb PZ |
430 | extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq, |
431 | struct sched_entity *se, int cpu, | |
432 | struct sched_entity *parent); | |
433 | extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b); | |
029632fb PZ |
434 | |
435 | extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b); | |
77a4d1a1 | 436 | extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b); |
029632fb PZ |
437 | extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq); |
438 | ||
439 | extern void free_rt_sched_group(struct task_group *tg); | |
440 | extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent); | |
441 | extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq, | |
442 | struct sched_rt_entity *rt_se, int cpu, | |
443 | struct sched_rt_entity *parent); | |
8887cd99 NP |
444 | extern int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us); |
445 | extern int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us); | |
446 | extern long sched_group_rt_runtime(struct task_group *tg); | |
447 | extern long sched_group_rt_period(struct task_group *tg); | |
448 | extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); | |
029632fb | 449 | |
25cc7da7 LZ |
450 | extern struct task_group *sched_create_group(struct task_group *parent); |
451 | extern void sched_online_group(struct task_group *tg, | |
452 | struct task_group *parent); | |
453 | extern void sched_destroy_group(struct task_group *tg); | |
454 | extern void sched_offline_group(struct task_group *tg); | |
455 | ||
456 | extern void sched_move_task(struct task_struct *tsk); | |
457 | ||
458 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
459 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); | |
ad936d86 BP |
460 | |
461 | #ifdef CONFIG_SMP | |
462 | extern void set_task_rq_fair(struct sched_entity *se, | |
463 | struct cfs_rq *prev, struct cfs_rq *next); | |
464 | #else /* !CONFIG_SMP */ | |
465 | static inline void set_task_rq_fair(struct sched_entity *se, | |
466 | struct cfs_rq *prev, struct cfs_rq *next) { } | |
467 | #endif /* CONFIG_SMP */ | |
468 | #endif /* CONFIG_FAIR_GROUP_SCHED */ | |
25cc7da7 | 469 | |
029632fb PZ |
470 | #else /* CONFIG_CGROUP_SCHED */ |
471 | ||
472 | struct cfs_bandwidth { }; | |
473 | ||
474 | #endif /* CONFIG_CGROUP_SCHED */ | |
475 | ||
476 | /* CFS-related fields in a runqueue */ | |
477 | struct cfs_rq { | |
97fb7a0a IM |
478 | struct load_weight load; |
479 | unsigned long runnable_weight; | |
480 | unsigned int nr_running; | |
481 | unsigned int h_nr_running; | |
029632fb | 482 | |
97fb7a0a IM |
483 | u64 exec_clock; |
484 | u64 min_vruntime; | |
029632fb | 485 | #ifndef CONFIG_64BIT |
97fb7a0a | 486 | u64 min_vruntime_copy; |
029632fb PZ |
487 | #endif |
488 | ||
97fb7a0a | 489 | struct rb_root_cached tasks_timeline; |
029632fb | 490 | |
029632fb PZ |
491 | /* |
492 | * 'curr' points to currently running entity on this cfs_rq. | |
493 | * It is set to NULL otherwise (i.e when none are currently running). | |
494 | */ | |
97fb7a0a IM |
495 | struct sched_entity *curr; |
496 | struct sched_entity *next; | |
497 | struct sched_entity *last; | |
498 | struct sched_entity *skip; | |
029632fb PZ |
499 | |
500 | #ifdef CONFIG_SCHED_DEBUG | |
97fb7a0a | 501 | unsigned int nr_spread_over; |
029632fb PZ |
502 | #endif |
503 | ||
2dac754e PT |
504 | #ifdef CONFIG_SMP |
505 | /* | |
9d89c257 | 506 | * CFS load tracking |
2dac754e | 507 | */ |
97fb7a0a | 508 | struct sched_avg avg; |
2a2f5d4e | 509 | #ifndef CONFIG_64BIT |
97fb7a0a | 510 | u64 load_last_update_time_copy; |
9d89c257 | 511 | #endif |
2a2f5d4e PZ |
512 | struct { |
513 | raw_spinlock_t lock ____cacheline_aligned; | |
514 | int nr; | |
515 | unsigned long load_avg; | |
516 | unsigned long util_avg; | |
0e2d2aaa | 517 | unsigned long runnable_sum; |
2a2f5d4e | 518 | } removed; |
82958366 | 519 | |
9d89c257 | 520 | #ifdef CONFIG_FAIR_GROUP_SCHED |
97fb7a0a IM |
521 | unsigned long tg_load_avg_contrib; |
522 | long propagate; | |
523 | long prop_runnable_sum; | |
0e2d2aaa | 524 | |
82958366 PT |
525 | /* |
526 | * h_load = weight * f(tg) | |
527 | * | |
528 | * Where f(tg) is the recursive weight fraction assigned to | |
529 | * this group. | |
530 | */ | |
97fb7a0a IM |
531 | unsigned long h_load; |
532 | u64 last_h_load_update; | |
533 | struct sched_entity *h_load_next; | |
68520796 | 534 | #endif /* CONFIG_FAIR_GROUP_SCHED */ |
82958366 PT |
535 | #endif /* CONFIG_SMP */ |
536 | ||
029632fb | 537 | #ifdef CONFIG_FAIR_GROUP_SCHED |
97fb7a0a | 538 | struct rq *rq; /* CPU runqueue to which this cfs_rq is attached */ |
029632fb PZ |
539 | |
540 | /* | |
541 | * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in | |
542 | * a hierarchy). Non-leaf lrqs hold other higher schedulable entities | |
543 | * (like users, containers etc.) | |
544 | * | |
97fb7a0a IM |
545 | * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a CPU. |
546 | * This list is used during load balance. | |
029632fb | 547 | */ |
97fb7a0a IM |
548 | int on_list; |
549 | struct list_head leaf_cfs_rq_list; | |
550 | struct task_group *tg; /* group that "owns" this runqueue */ | |
029632fb | 551 | |
029632fb | 552 | #ifdef CONFIG_CFS_BANDWIDTH |
97fb7a0a IM |
553 | int runtime_enabled; |
554 | u64 runtime_expires; | |
555 | s64 runtime_remaining; | |
556 | ||
557 | u64 throttled_clock; | |
558 | u64 throttled_clock_task; | |
559 | u64 throttled_clock_task_time; | |
560 | int throttled; | |
561 | int throttle_count; | |
562 | struct list_head throttled_list; | |
029632fb PZ |
563 | #endif /* CONFIG_CFS_BANDWIDTH */ |
564 | #endif /* CONFIG_FAIR_GROUP_SCHED */ | |
565 | }; | |
566 | ||
567 | static inline int rt_bandwidth_enabled(void) | |
568 | { | |
569 | return sysctl_sched_rt_runtime >= 0; | |
570 | } | |
571 | ||
b6366f04 | 572 | /* RT IPI pull logic requires IRQ_WORK */ |
4bdced5c | 573 | #if defined(CONFIG_IRQ_WORK) && defined(CONFIG_SMP) |
b6366f04 SR |
574 | # define HAVE_RT_PUSH_IPI |
575 | #endif | |
576 | ||
029632fb PZ |
577 | /* Real-Time classes' related field in a runqueue: */ |
578 | struct rt_rq { | |
97fb7a0a IM |
579 | struct rt_prio_array active; |
580 | unsigned int rt_nr_running; | |
581 | unsigned int rr_nr_running; | |
029632fb PZ |
582 | #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED |
583 | struct { | |
97fb7a0a | 584 | int curr; /* highest queued rt task prio */ |
029632fb | 585 | #ifdef CONFIG_SMP |
97fb7a0a | 586 | int next; /* next highest */ |
029632fb PZ |
587 | #endif |
588 | } highest_prio; | |
589 | #endif | |
590 | #ifdef CONFIG_SMP | |
97fb7a0a IM |
591 | unsigned long rt_nr_migratory; |
592 | unsigned long rt_nr_total; | |
593 | int overloaded; | |
594 | struct plist_head pushable_tasks; | |
b6366f04 | 595 | #endif /* CONFIG_SMP */ |
97fb7a0a | 596 | int rt_queued; |
f4ebcbc0 | 597 | |
97fb7a0a IM |
598 | int rt_throttled; |
599 | u64 rt_time; | |
600 | u64 rt_runtime; | |
029632fb | 601 | /* Nests inside the rq lock: */ |
97fb7a0a | 602 | raw_spinlock_t rt_runtime_lock; |
029632fb PZ |
603 | |
604 | #ifdef CONFIG_RT_GROUP_SCHED | |
97fb7a0a | 605 | unsigned long rt_nr_boosted; |
029632fb | 606 | |
97fb7a0a IM |
607 | struct rq *rq; |
608 | struct task_group *tg; | |
029632fb PZ |
609 | #endif |
610 | }; | |
611 | ||
aab03e05 DF |
612 | /* Deadline class' related fields in a runqueue */ |
613 | struct dl_rq { | |
614 | /* runqueue is an rbtree, ordered by deadline */ | |
97fb7a0a | 615 | struct rb_root_cached root; |
aab03e05 | 616 | |
97fb7a0a | 617 | unsigned long dl_nr_running; |
1baca4ce JL |
618 | |
619 | #ifdef CONFIG_SMP | |
620 | /* | |
621 | * Deadline values of the currently executing and the | |
622 | * earliest ready task on this rq. Caching these facilitates | |
623 | * the decision wether or not a ready but not running task | |
624 | * should migrate somewhere else. | |
625 | */ | |
626 | struct { | |
97fb7a0a IM |
627 | u64 curr; |
628 | u64 next; | |
1baca4ce JL |
629 | } earliest_dl; |
630 | ||
97fb7a0a IM |
631 | unsigned long dl_nr_migratory; |
632 | int overloaded; | |
1baca4ce JL |
633 | |
634 | /* | |
635 | * Tasks on this rq that can be pushed away. They are kept in | |
636 | * an rb-tree, ordered by tasks' deadlines, with caching | |
637 | * of the leftmost (earliest deadline) element. | |
638 | */ | |
97fb7a0a | 639 | struct rb_root_cached pushable_dl_tasks_root; |
332ac17e | 640 | #else |
97fb7a0a | 641 | struct dl_bw dl_bw; |
1baca4ce | 642 | #endif |
e36d8677 LA |
643 | /* |
644 | * "Active utilization" for this runqueue: increased when a | |
645 | * task wakes up (becomes TASK_RUNNING) and decreased when a | |
646 | * task blocks | |
647 | */ | |
97fb7a0a | 648 | u64 running_bw; |
4da3abce | 649 | |
8fd27231 LA |
650 | /* |
651 | * Utilization of the tasks "assigned" to this runqueue (including | |
652 | * the tasks that are in runqueue and the tasks that executed on this | |
653 | * CPU and blocked). Increased when a task moves to this runqueue, and | |
654 | * decreased when the task moves away (migrates, changes scheduling | |
655 | * policy, or terminates). | |
656 | * This is needed to compute the "inactive utilization" for the | |
657 | * runqueue (inactive utilization = this_bw - running_bw). | |
658 | */ | |
97fb7a0a IM |
659 | u64 this_bw; |
660 | u64 extra_bw; | |
8fd27231 | 661 | |
4da3abce LA |
662 | /* |
663 | * Inverse of the fraction of CPU utilization that can be reclaimed | |
664 | * by the GRUB algorithm. | |
665 | */ | |
97fb7a0a | 666 | u64 bw_ratio; |
aab03e05 DF |
667 | }; |
668 | ||
029632fb PZ |
669 | #ifdef CONFIG_SMP |
670 | ||
afe06efd TC |
671 | static inline bool sched_asym_prefer(int a, int b) |
672 | { | |
673 | return arch_asym_cpu_priority(a) > arch_asym_cpu_priority(b); | |
674 | } | |
675 | ||
029632fb PZ |
676 | /* |
677 | * We add the notion of a root-domain which will be used to define per-domain | |
678 | * variables. Each exclusive cpuset essentially defines an island domain by | |
97fb7a0a | 679 | * fully partitioning the member CPUs from any other cpuset. Whenever a new |
029632fb PZ |
680 | * exclusive cpuset is created, we also create and attach a new root-domain |
681 | * object. | |
682 | * | |
683 | */ | |
684 | struct root_domain { | |
97fb7a0a IM |
685 | atomic_t refcount; |
686 | atomic_t rto_count; | |
687 | struct rcu_head rcu; | |
688 | cpumask_var_t span; | |
689 | cpumask_var_t online; | |
029632fb | 690 | |
4486edd1 | 691 | /* Indicate more than one runnable task for any CPU */ |
97fb7a0a | 692 | bool overload; |
4486edd1 | 693 | |
1baca4ce JL |
694 | /* |
695 | * The bit corresponding to a CPU gets set here if such CPU has more | |
696 | * than one runnable -deadline task (as it is below for RT tasks). | |
697 | */ | |
97fb7a0a IM |
698 | cpumask_var_t dlo_mask; |
699 | atomic_t dlo_count; | |
700 | struct dl_bw dl_bw; | |
701 | struct cpudl cpudl; | |
1baca4ce | 702 | |
4bdced5c SRRH |
703 | #ifdef HAVE_RT_PUSH_IPI |
704 | /* | |
705 | * For IPI pull requests, loop across the rto_mask. | |
706 | */ | |
97fb7a0a IM |
707 | struct irq_work rto_push_work; |
708 | raw_spinlock_t rto_lock; | |
4bdced5c | 709 | /* These are only updated and read within rto_lock */ |
97fb7a0a IM |
710 | int rto_loop; |
711 | int rto_cpu; | |
4bdced5c | 712 | /* These atomics are updated outside of a lock */ |
97fb7a0a IM |
713 | atomic_t rto_loop_next; |
714 | atomic_t rto_loop_start; | |
4bdced5c | 715 | #endif |
029632fb PZ |
716 | /* |
717 | * The "RT overload" flag: it gets set if a CPU has more than | |
718 | * one runnable RT task. | |
719 | */ | |
97fb7a0a IM |
720 | cpumask_var_t rto_mask; |
721 | struct cpupri cpupri; | |
cd92bfd3 | 722 | |
97fb7a0a | 723 | unsigned long max_cpu_capacity; |
029632fb PZ |
724 | }; |
725 | ||
726 | extern struct root_domain def_root_domain; | |
f2cb1360 | 727 | extern struct mutex sched_domains_mutex; |
f2cb1360 IM |
728 | |
729 | extern void init_defrootdomain(void); | |
8d5dc512 | 730 | extern int sched_init_domains(const struct cpumask *cpu_map); |
f2cb1360 | 731 | extern void rq_attach_root(struct rq *rq, struct root_domain *rd); |
364f5665 SRV |
732 | extern void sched_get_rd(struct root_domain *rd); |
733 | extern void sched_put_rd(struct root_domain *rd); | |
029632fb | 734 | |
4bdced5c SRRH |
735 | #ifdef HAVE_RT_PUSH_IPI |
736 | extern void rto_push_irq_work_func(struct irq_work *work); | |
737 | #endif | |
029632fb PZ |
738 | #endif /* CONFIG_SMP */ |
739 | ||
740 | /* | |
741 | * This is the main, per-CPU runqueue data structure. | |
742 | * | |
743 | * Locking rule: those places that want to lock multiple runqueues | |
744 | * (such as the load balancing or the thread migration code), lock | |
745 | * acquire operations must be ordered by ascending &runqueue. | |
746 | */ | |
747 | struct rq { | |
748 | /* runqueue lock: */ | |
97fb7a0a | 749 | raw_spinlock_t lock; |
029632fb PZ |
750 | |
751 | /* | |
752 | * nr_running and cpu_load should be in the same cacheline because | |
753 | * remote CPUs use both these fields when doing load calculation. | |
754 | */ | |
97fb7a0a | 755 | unsigned int nr_running; |
0ec8aa00 | 756 | #ifdef CONFIG_NUMA_BALANCING |
97fb7a0a IM |
757 | unsigned int nr_numa_running; |
758 | unsigned int nr_preferred_running; | |
0ec8aa00 | 759 | #endif |
029632fb | 760 | #define CPU_LOAD_IDX_MAX 5 |
97fb7a0a | 761 | unsigned long cpu_load[CPU_LOAD_IDX_MAX]; |
3451d024 | 762 | #ifdef CONFIG_NO_HZ_COMMON |
9fd81dd5 | 763 | #ifdef CONFIG_SMP |
97fb7a0a | 764 | unsigned long last_load_update_tick; |
e022e0d3 | 765 | unsigned long last_blocked_load_update_tick; |
f643ea22 | 766 | unsigned int has_blocked_load; |
9fd81dd5 | 767 | #endif /* CONFIG_SMP */ |
00357f5e | 768 | unsigned int nohz_tick_stopped; |
a22e47a4 | 769 | atomic_t nohz_flags; |
9fd81dd5 | 770 | #endif /* CONFIG_NO_HZ_COMMON */ |
dcdedb24 | 771 | |
97fb7a0a IM |
772 | /* capture load from *all* tasks on this CPU: */ |
773 | struct load_weight load; | |
774 | unsigned long nr_load_updates; | |
775 | u64 nr_switches; | |
029632fb | 776 | |
97fb7a0a IM |
777 | struct cfs_rq cfs; |
778 | struct rt_rq rt; | |
779 | struct dl_rq dl; | |
029632fb PZ |
780 | |
781 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
97fb7a0a IM |
782 | /* list of leaf cfs_rq on this CPU: */ |
783 | struct list_head leaf_cfs_rq_list; | |
784 | struct list_head *tmp_alone_branch; | |
a35b6466 PZ |
785 | #endif /* CONFIG_FAIR_GROUP_SCHED */ |
786 | ||
029632fb PZ |
787 | /* |
788 | * This is part of a global counter where only the total sum | |
789 | * over all CPUs matters. A task can increase this counter on | |
790 | * one CPU and if it got migrated afterwards it may decrease | |
791 | * it on another CPU. Always updated under the runqueue lock: | |
792 | */ | |
97fb7a0a | 793 | unsigned long nr_uninterruptible; |
029632fb | 794 | |
97fb7a0a IM |
795 | struct task_struct *curr; |
796 | struct task_struct *idle; | |
797 | struct task_struct *stop; | |
798 | unsigned long next_balance; | |
799 | struct mm_struct *prev_mm; | |
029632fb | 800 | |
97fb7a0a IM |
801 | unsigned int clock_update_flags; |
802 | u64 clock; | |
803 | u64 clock_task; | |
029632fb | 804 | |
97fb7a0a | 805 | atomic_t nr_iowait; |
029632fb PZ |
806 | |
807 | #ifdef CONFIG_SMP | |
97fb7a0a IM |
808 | struct root_domain *rd; |
809 | struct sched_domain *sd; | |
810 | ||
811 | unsigned long cpu_capacity; | |
812 | unsigned long cpu_capacity_orig; | |
029632fb | 813 | |
97fb7a0a | 814 | struct callback_head *balance_callback; |
029632fb | 815 | |
97fb7a0a | 816 | unsigned char idle_balance; |
e3fca9e7 | 817 | |
029632fb | 818 | /* For active balancing */ |
97fb7a0a IM |
819 | int active_balance; |
820 | int push_cpu; | |
821 | struct cpu_stop_work active_balance_work; | |
822 | ||
823 | /* CPU of this runqueue: */ | |
824 | int cpu; | |
825 | int online; | |
029632fb | 826 | |
367456c7 PZ |
827 | struct list_head cfs_tasks; |
828 | ||
97fb7a0a IM |
829 | u64 rt_avg; |
830 | u64 age_stamp; | |
831 | u64 idle_stamp; | |
832 | u64 avg_idle; | |
9bd721c5 JL |
833 | |
834 | /* This is used to determine avg_idle's max value */ | |
97fb7a0a | 835 | u64 max_idle_balance_cost; |
029632fb PZ |
836 | #endif |
837 | ||
838 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING | |
97fb7a0a | 839 | u64 prev_irq_time; |
029632fb PZ |
840 | #endif |
841 | #ifdef CONFIG_PARAVIRT | |
97fb7a0a | 842 | u64 prev_steal_time; |
029632fb PZ |
843 | #endif |
844 | #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING | |
97fb7a0a | 845 | u64 prev_steal_time_rq; |
029632fb PZ |
846 | #endif |
847 | ||
848 | /* calc_load related fields */ | |
97fb7a0a IM |
849 | unsigned long calc_load_update; |
850 | long calc_load_active; | |
029632fb PZ |
851 | |
852 | #ifdef CONFIG_SCHED_HRTICK | |
853 | #ifdef CONFIG_SMP | |
97fb7a0a IM |
854 | int hrtick_csd_pending; |
855 | call_single_data_t hrtick_csd; | |
029632fb | 856 | #endif |
97fb7a0a | 857 | struct hrtimer hrtick_timer; |
029632fb PZ |
858 | #endif |
859 | ||
860 | #ifdef CONFIG_SCHEDSTATS | |
861 | /* latency stats */ | |
97fb7a0a IM |
862 | struct sched_info rq_sched_info; |
863 | unsigned long long rq_cpu_time; | |
029632fb PZ |
864 | /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */ |
865 | ||
866 | /* sys_sched_yield() stats */ | |
97fb7a0a | 867 | unsigned int yld_count; |
029632fb PZ |
868 | |
869 | /* schedule() stats */ | |
97fb7a0a IM |
870 | unsigned int sched_count; |
871 | unsigned int sched_goidle; | |
029632fb PZ |
872 | |
873 | /* try_to_wake_up() stats */ | |
97fb7a0a IM |
874 | unsigned int ttwu_count; |
875 | unsigned int ttwu_local; | |
029632fb PZ |
876 | #endif |
877 | ||
878 | #ifdef CONFIG_SMP | |
97fb7a0a | 879 | struct llist_head wake_list; |
029632fb | 880 | #endif |
442bf3aa DL |
881 | |
882 | #ifdef CONFIG_CPU_IDLE | |
883 | /* Must be inspected within a rcu lock section */ | |
97fb7a0a | 884 | struct cpuidle_state *idle_state; |
442bf3aa | 885 | #endif |
029632fb PZ |
886 | }; |
887 | ||
888 | static inline int cpu_of(struct rq *rq) | |
889 | { | |
890 | #ifdef CONFIG_SMP | |
891 | return rq->cpu; | |
892 | #else | |
893 | return 0; | |
894 | #endif | |
895 | } | |
896 | ||
1b568f0a PZ |
897 | |
898 | #ifdef CONFIG_SCHED_SMT | |
899 | ||
900 | extern struct static_key_false sched_smt_present; | |
901 | ||
902 | extern void __update_idle_core(struct rq *rq); | |
903 | ||
904 | static inline void update_idle_core(struct rq *rq) | |
905 | { | |
906 | if (static_branch_unlikely(&sched_smt_present)) | |
907 | __update_idle_core(rq); | |
908 | } | |
909 | ||
910 | #else | |
911 | static inline void update_idle_core(struct rq *rq) { } | |
912 | #endif | |
913 | ||
8b06c55b | 914 | DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); |
029632fb | 915 | |
518cd623 | 916 | #define cpu_rq(cpu) (&per_cpu(runqueues, (cpu))) |
4a32fea9 | 917 | #define this_rq() this_cpu_ptr(&runqueues) |
518cd623 PZ |
918 | #define task_rq(p) cpu_rq(task_cpu(p)) |
919 | #define cpu_curr(cpu) (cpu_rq(cpu)->curr) | |
4a32fea9 | 920 | #define raw_rq() raw_cpu_ptr(&runqueues) |
518cd623 | 921 | |
cebde6d6 PZ |
922 | static inline u64 __rq_clock_broken(struct rq *rq) |
923 | { | |
316c1608 | 924 | return READ_ONCE(rq->clock); |
cebde6d6 PZ |
925 | } |
926 | ||
cb42c9a3 MF |
927 | /* |
928 | * rq::clock_update_flags bits | |
929 | * | |
930 | * %RQCF_REQ_SKIP - will request skipping of clock update on the next | |
931 | * call to __schedule(). This is an optimisation to avoid | |
932 | * neighbouring rq clock updates. | |
933 | * | |
934 | * %RQCF_ACT_SKIP - is set from inside of __schedule() when skipping is | |
935 | * in effect and calls to update_rq_clock() are being ignored. | |
936 | * | |
937 | * %RQCF_UPDATED - is a debug flag that indicates whether a call has been | |
938 | * made to update_rq_clock() since the last time rq::lock was pinned. | |
939 | * | |
940 | * If inside of __schedule(), clock_update_flags will have been | |
941 | * shifted left (a left shift is a cheap operation for the fast path | |
942 | * to promote %RQCF_REQ_SKIP to %RQCF_ACT_SKIP), so you must use, | |
943 | * | |
944 | * if (rq-clock_update_flags >= RQCF_UPDATED) | |
945 | * | |
946 | * to check if %RQCF_UPADTED is set. It'll never be shifted more than | |
947 | * one position though, because the next rq_unpin_lock() will shift it | |
948 | * back. | |
949 | */ | |
97fb7a0a IM |
950 | #define RQCF_REQ_SKIP 0x01 |
951 | #define RQCF_ACT_SKIP 0x02 | |
952 | #define RQCF_UPDATED 0x04 | |
cb42c9a3 MF |
953 | |
954 | static inline void assert_clock_updated(struct rq *rq) | |
955 | { | |
956 | /* | |
957 | * The only reason for not seeing a clock update since the | |
958 | * last rq_pin_lock() is if we're currently skipping updates. | |
959 | */ | |
960 | SCHED_WARN_ON(rq->clock_update_flags < RQCF_ACT_SKIP); | |
961 | } | |
962 | ||
78becc27 FW |
963 | static inline u64 rq_clock(struct rq *rq) |
964 | { | |
cebde6d6 | 965 | lockdep_assert_held(&rq->lock); |
cb42c9a3 MF |
966 | assert_clock_updated(rq); |
967 | ||
78becc27 FW |
968 | return rq->clock; |
969 | } | |
970 | ||
971 | static inline u64 rq_clock_task(struct rq *rq) | |
972 | { | |
cebde6d6 | 973 | lockdep_assert_held(&rq->lock); |
cb42c9a3 MF |
974 | assert_clock_updated(rq); |
975 | ||
78becc27 FW |
976 | return rq->clock_task; |
977 | } | |
978 | ||
adcc8da8 | 979 | static inline void rq_clock_skip_update(struct rq *rq) |
9edfbfed PZ |
980 | { |
981 | lockdep_assert_held(&rq->lock); | |
adcc8da8 DB |
982 | rq->clock_update_flags |= RQCF_REQ_SKIP; |
983 | } | |
984 | ||
985 | /* | |
986 | * See rt task throttoling, which is the only time a skip | |
987 | * request is cancelled. | |
988 | */ | |
989 | static inline void rq_clock_cancel_skipupdate(struct rq *rq) | |
990 | { | |
991 | lockdep_assert_held(&rq->lock); | |
992 | rq->clock_update_flags &= ~RQCF_REQ_SKIP; | |
9edfbfed PZ |
993 | } |
994 | ||
d8ac8971 MF |
995 | struct rq_flags { |
996 | unsigned long flags; | |
997 | struct pin_cookie cookie; | |
cb42c9a3 MF |
998 | #ifdef CONFIG_SCHED_DEBUG |
999 | /* | |
1000 | * A copy of (rq::clock_update_flags & RQCF_UPDATED) for the | |
1001 | * current pin context is stashed here in case it needs to be | |
1002 | * restored in rq_repin_lock(). | |
1003 | */ | |
1004 | unsigned int clock_update_flags; | |
1005 | #endif | |
d8ac8971 MF |
1006 | }; |
1007 | ||
1008 | static inline void rq_pin_lock(struct rq *rq, struct rq_flags *rf) | |
1009 | { | |
1010 | rf->cookie = lockdep_pin_lock(&rq->lock); | |
cb42c9a3 MF |
1011 | |
1012 | #ifdef CONFIG_SCHED_DEBUG | |
1013 | rq->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP); | |
1014 | rf->clock_update_flags = 0; | |
1015 | #endif | |
d8ac8971 MF |
1016 | } |
1017 | ||
1018 | static inline void rq_unpin_lock(struct rq *rq, struct rq_flags *rf) | |
1019 | { | |
cb42c9a3 MF |
1020 | #ifdef CONFIG_SCHED_DEBUG |
1021 | if (rq->clock_update_flags > RQCF_ACT_SKIP) | |
1022 | rf->clock_update_flags = RQCF_UPDATED; | |
1023 | #endif | |
1024 | ||
d8ac8971 MF |
1025 | lockdep_unpin_lock(&rq->lock, rf->cookie); |
1026 | } | |
1027 | ||
1028 | static inline void rq_repin_lock(struct rq *rq, struct rq_flags *rf) | |
1029 | { | |
1030 | lockdep_repin_lock(&rq->lock, rf->cookie); | |
cb42c9a3 MF |
1031 | |
1032 | #ifdef CONFIG_SCHED_DEBUG | |
1033 | /* | |
1034 | * Restore the value we stashed in @rf for this pin context. | |
1035 | */ | |
1036 | rq->clock_update_flags |= rf->clock_update_flags; | |
1037 | #endif | |
d8ac8971 MF |
1038 | } |
1039 | ||
9942f79b | 1040 | #ifdef CONFIG_NUMA |
e3fe70b1 RR |
1041 | enum numa_topology_type { |
1042 | NUMA_DIRECT, | |
1043 | NUMA_GLUELESS_MESH, | |
1044 | NUMA_BACKPLANE, | |
1045 | }; | |
1046 | extern enum numa_topology_type sched_numa_topology_type; | |
9942f79b RR |
1047 | extern int sched_max_numa_distance; |
1048 | extern bool find_numa_distance(int distance); | |
1049 | #endif | |
1050 | ||
f2cb1360 IM |
1051 | #ifdef CONFIG_NUMA |
1052 | extern void sched_init_numa(void); | |
1053 | extern void sched_domains_numa_masks_set(unsigned int cpu); | |
1054 | extern void sched_domains_numa_masks_clear(unsigned int cpu); | |
1055 | #else | |
1056 | static inline void sched_init_numa(void) { } | |
1057 | static inline void sched_domains_numa_masks_set(unsigned int cpu) { } | |
1058 | static inline void sched_domains_numa_masks_clear(unsigned int cpu) { } | |
1059 | #endif | |
1060 | ||
f809ca9a | 1061 | #ifdef CONFIG_NUMA_BALANCING |
44dba3d5 IM |
1062 | /* The regions in numa_faults array from task_struct */ |
1063 | enum numa_faults_stats { | |
1064 | NUMA_MEM = 0, | |
1065 | NUMA_CPU, | |
1066 | NUMA_MEMBUF, | |
1067 | NUMA_CPUBUF | |
1068 | }; | |
0ec8aa00 | 1069 | extern void sched_setnuma(struct task_struct *p, int node); |
e6628d5b | 1070 | extern int migrate_task_to(struct task_struct *p, int cpu); |
ac66f547 | 1071 | extern int migrate_swap(struct task_struct *, struct task_struct *); |
f809ca9a MG |
1072 | #endif /* CONFIG_NUMA_BALANCING */ |
1073 | ||
518cd623 PZ |
1074 | #ifdef CONFIG_SMP |
1075 | ||
e3fca9e7 PZ |
1076 | static inline void |
1077 | queue_balance_callback(struct rq *rq, | |
1078 | struct callback_head *head, | |
1079 | void (*func)(struct rq *rq)) | |
1080 | { | |
1081 | lockdep_assert_held(&rq->lock); | |
1082 | ||
1083 | if (unlikely(head->next)) | |
1084 | return; | |
1085 | ||
1086 | head->func = (void (*)(struct callback_head *))func; | |
1087 | head->next = rq->balance_callback; | |
1088 | rq->balance_callback = head; | |
1089 | } | |
1090 | ||
e3baac47 PZ |
1091 | extern void sched_ttwu_pending(void); |
1092 | ||
029632fb PZ |
1093 | #define rcu_dereference_check_sched_domain(p) \ |
1094 | rcu_dereference_check((p), \ | |
1095 | lockdep_is_held(&sched_domains_mutex)) | |
1096 | ||
1097 | /* | |
1098 | * The domain tree (rq->sd) is protected by RCU's quiescent state transition. | |
1099 | * See detach_destroy_domains: synchronize_sched for details. | |
1100 | * | |
1101 | * The domain tree of any CPU may only be accessed from within | |
1102 | * preempt-disabled sections. | |
1103 | */ | |
1104 | #define for_each_domain(cpu, __sd) \ | |
518cd623 PZ |
1105 | for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \ |
1106 | __sd; __sd = __sd->parent) | |
029632fb | 1107 | |
77e81365 SS |
1108 | #define for_each_lower_domain(sd) for (; sd; sd = sd->child) |
1109 | ||
518cd623 PZ |
1110 | /** |
1111 | * highest_flag_domain - Return highest sched_domain containing flag. | |
97fb7a0a | 1112 | * @cpu: The CPU whose highest level of sched domain is to |
518cd623 PZ |
1113 | * be returned. |
1114 | * @flag: The flag to check for the highest sched_domain | |
97fb7a0a | 1115 | * for the given CPU. |
518cd623 | 1116 | * |
97fb7a0a | 1117 | * Returns the highest sched_domain of a CPU which contains the given flag. |
518cd623 PZ |
1118 | */ |
1119 | static inline struct sched_domain *highest_flag_domain(int cpu, int flag) | |
1120 | { | |
1121 | struct sched_domain *sd, *hsd = NULL; | |
1122 | ||
1123 | for_each_domain(cpu, sd) { | |
1124 | if (!(sd->flags & flag)) | |
1125 | break; | |
1126 | hsd = sd; | |
1127 | } | |
1128 | ||
1129 | return hsd; | |
1130 | } | |
1131 | ||
fb13c7ee MG |
1132 | static inline struct sched_domain *lowest_flag_domain(int cpu, int flag) |
1133 | { | |
1134 | struct sched_domain *sd; | |
1135 | ||
1136 | for_each_domain(cpu, sd) { | |
1137 | if (sd->flags & flag) | |
1138 | break; | |
1139 | } | |
1140 | ||
1141 | return sd; | |
1142 | } | |
1143 | ||
518cd623 | 1144 | DECLARE_PER_CPU(struct sched_domain *, sd_llc); |
7d9ffa89 | 1145 | DECLARE_PER_CPU(int, sd_llc_size); |
518cd623 | 1146 | DECLARE_PER_CPU(int, sd_llc_id); |
0e369d75 | 1147 | DECLARE_PER_CPU(struct sched_domain_shared *, sd_llc_shared); |
fb13c7ee | 1148 | DECLARE_PER_CPU(struct sched_domain *, sd_numa); |
37dc6b50 | 1149 | DECLARE_PER_CPU(struct sched_domain *, sd_asym); |
518cd623 | 1150 | |
63b2ca30 | 1151 | struct sched_group_capacity { |
97fb7a0a | 1152 | atomic_t ref; |
5e6521ea | 1153 | /* |
172895e6 | 1154 | * CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity |
63b2ca30 | 1155 | * for a single CPU. |
5e6521ea | 1156 | */ |
97fb7a0a IM |
1157 | unsigned long capacity; |
1158 | unsigned long min_capacity; /* Min per-CPU capacity in group */ | |
1159 | unsigned long next_update; | |
1160 | int imbalance; /* XXX unrelated to capacity but shared group state */ | |
5e6521ea | 1161 | |
005f874d | 1162 | #ifdef CONFIG_SCHED_DEBUG |
97fb7a0a | 1163 | int id; |
005f874d PZ |
1164 | #endif |
1165 | ||
97fb7a0a | 1166 | unsigned long cpumask[0]; /* Balance mask */ |
5e6521ea LZ |
1167 | }; |
1168 | ||
1169 | struct sched_group { | |
97fb7a0a IM |
1170 | struct sched_group *next; /* Must be a circular list */ |
1171 | atomic_t ref; | |
5e6521ea | 1172 | |
97fb7a0a | 1173 | unsigned int group_weight; |
63b2ca30 | 1174 | struct sched_group_capacity *sgc; |
97fb7a0a | 1175 | int asym_prefer_cpu; /* CPU of highest priority in group */ |
5e6521ea LZ |
1176 | |
1177 | /* | |
1178 | * The CPUs this group covers. | |
1179 | * | |
1180 | * NOTE: this field is variable length. (Allocated dynamically | |
1181 | * by attaching extra space to the end of the structure, | |
1182 | * depending on how many CPUs the kernel has booted up with) | |
1183 | */ | |
97fb7a0a | 1184 | unsigned long cpumask[0]; |
5e6521ea LZ |
1185 | }; |
1186 | ||
ae4df9d6 | 1187 | static inline struct cpumask *sched_group_span(struct sched_group *sg) |
5e6521ea LZ |
1188 | { |
1189 | return to_cpumask(sg->cpumask); | |
1190 | } | |
1191 | ||
1192 | /* | |
e5c14b1f | 1193 | * See build_balance_mask(). |
5e6521ea | 1194 | */ |
e5c14b1f | 1195 | static inline struct cpumask *group_balance_mask(struct sched_group *sg) |
5e6521ea | 1196 | { |
63b2ca30 | 1197 | return to_cpumask(sg->sgc->cpumask); |
5e6521ea LZ |
1198 | } |
1199 | ||
1200 | /** | |
97fb7a0a IM |
1201 | * group_first_cpu - Returns the first CPU in the cpumask of a sched_group. |
1202 | * @group: The group whose first CPU is to be returned. | |
5e6521ea LZ |
1203 | */ |
1204 | static inline unsigned int group_first_cpu(struct sched_group *group) | |
1205 | { | |
ae4df9d6 | 1206 | return cpumask_first(sched_group_span(group)); |
5e6521ea LZ |
1207 | } |
1208 | ||
c1174876 PZ |
1209 | extern int group_balance_cpu(struct sched_group *sg); |
1210 | ||
3866e845 SRRH |
1211 | #if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL) |
1212 | void register_sched_domain_sysctl(void); | |
bbdacdfe | 1213 | void dirty_sched_domain_sysctl(int cpu); |
3866e845 SRRH |
1214 | void unregister_sched_domain_sysctl(void); |
1215 | #else | |
1216 | static inline void register_sched_domain_sysctl(void) | |
1217 | { | |
1218 | } | |
bbdacdfe PZ |
1219 | static inline void dirty_sched_domain_sysctl(int cpu) |
1220 | { | |
1221 | } | |
3866e845 SRRH |
1222 | static inline void unregister_sched_domain_sysctl(void) |
1223 | { | |
1224 | } | |
1225 | #endif | |
1226 | ||
e3baac47 PZ |
1227 | #else |
1228 | ||
1229 | static inline void sched_ttwu_pending(void) { } | |
1230 | ||
518cd623 | 1231 | #endif /* CONFIG_SMP */ |
029632fb | 1232 | |
391e43da | 1233 | #include "stats.h" |
1051408f | 1234 | #include "autogroup.h" |
029632fb PZ |
1235 | |
1236 | #ifdef CONFIG_CGROUP_SCHED | |
1237 | ||
1238 | /* | |
1239 | * Return the group to which this tasks belongs. | |
1240 | * | |
8af01f56 TH |
1241 | * We cannot use task_css() and friends because the cgroup subsystem |
1242 | * changes that value before the cgroup_subsys::attach() method is called, | |
1243 | * therefore we cannot pin it and might observe the wrong value. | |
8323f26c PZ |
1244 | * |
1245 | * The same is true for autogroup's p->signal->autogroup->tg, the autogroup | |
1246 | * core changes this before calling sched_move_task(). | |
1247 | * | |
1248 | * Instead we use a 'copy' which is updated from sched_move_task() while | |
1249 | * holding both task_struct::pi_lock and rq::lock. | |
029632fb PZ |
1250 | */ |
1251 | static inline struct task_group *task_group(struct task_struct *p) | |
1252 | { | |
8323f26c | 1253 | return p->sched_task_group; |
029632fb PZ |
1254 | } |
1255 | ||
1256 | /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */ | |
1257 | static inline void set_task_rq(struct task_struct *p, unsigned int cpu) | |
1258 | { | |
1259 | #if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED) | |
1260 | struct task_group *tg = task_group(p); | |
1261 | #endif | |
1262 | ||
1263 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
ad936d86 | 1264 | set_task_rq_fair(&p->se, p->se.cfs_rq, tg->cfs_rq[cpu]); |
029632fb PZ |
1265 | p->se.cfs_rq = tg->cfs_rq[cpu]; |
1266 | p->se.parent = tg->se[cpu]; | |
1267 | #endif | |
1268 | ||
1269 | #ifdef CONFIG_RT_GROUP_SCHED | |
1270 | p->rt.rt_rq = tg->rt_rq[cpu]; | |
1271 | p->rt.parent = tg->rt_se[cpu]; | |
1272 | #endif | |
1273 | } | |
1274 | ||
1275 | #else /* CONFIG_CGROUP_SCHED */ | |
1276 | ||
1277 | static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { } | |
1278 | static inline struct task_group *task_group(struct task_struct *p) | |
1279 | { | |
1280 | return NULL; | |
1281 | } | |
1282 | ||
1283 | #endif /* CONFIG_CGROUP_SCHED */ | |
1284 | ||
1285 | static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu) | |
1286 | { | |
1287 | set_task_rq(p, cpu); | |
1288 | #ifdef CONFIG_SMP | |
1289 | /* | |
1290 | * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be | |
1291 | * successfuly executed on another CPU. We must ensure that updates of | |
1292 | * per-task data have been completed by this moment. | |
1293 | */ | |
1294 | smp_wmb(); | |
c65eacbe AL |
1295 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
1296 | p->cpu = cpu; | |
1297 | #else | |
029632fb | 1298 | task_thread_info(p)->cpu = cpu; |
c65eacbe | 1299 | #endif |
ac66f547 | 1300 | p->wake_cpu = cpu; |
029632fb PZ |
1301 | #endif |
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * Tunables that become constants when CONFIG_SCHED_DEBUG is off: | |
1306 | */ | |
1307 | #ifdef CONFIG_SCHED_DEBUG | |
c5905afb | 1308 | # include <linux/static_key.h> |
029632fb PZ |
1309 | # define const_debug __read_mostly |
1310 | #else | |
1311 | # define const_debug const | |
1312 | #endif | |
1313 | ||
029632fb PZ |
1314 | #define SCHED_FEAT(name, enabled) \ |
1315 | __SCHED_FEAT_##name , | |
1316 | ||
1317 | enum { | |
391e43da | 1318 | #include "features.h" |
f8b6d1cc | 1319 | __SCHED_FEAT_NR, |
029632fb PZ |
1320 | }; |
1321 | ||
1322 | #undef SCHED_FEAT | |
1323 | ||
f8b6d1cc | 1324 | #if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL) |
765cc3a4 PB |
1325 | |
1326 | /* | |
1327 | * To support run-time toggling of sched features, all the translation units | |
1328 | * (but core.c) reference the sysctl_sched_features defined in core.c. | |
1329 | */ | |
1330 | extern const_debug unsigned int sysctl_sched_features; | |
1331 | ||
f8b6d1cc | 1332 | #define SCHED_FEAT(name, enabled) \ |
c5905afb | 1333 | static __always_inline bool static_branch_##name(struct static_key *key) \ |
f8b6d1cc | 1334 | { \ |
6e76ea8a | 1335 | return static_key_##enabled(key); \ |
f8b6d1cc PZ |
1336 | } |
1337 | ||
1338 | #include "features.h" | |
f8b6d1cc PZ |
1339 | #undef SCHED_FEAT |
1340 | ||
c5905afb | 1341 | extern struct static_key sched_feat_keys[__SCHED_FEAT_NR]; |
f8b6d1cc | 1342 | #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x])) |
765cc3a4 | 1343 | |
f8b6d1cc | 1344 | #else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */ |
765cc3a4 PB |
1345 | |
1346 | /* | |
1347 | * Each translation unit has its own copy of sysctl_sched_features to allow | |
1348 | * constants propagation at compile time and compiler optimization based on | |
1349 | * features default. | |
1350 | */ | |
1351 | #define SCHED_FEAT(name, enabled) \ | |
1352 | (1UL << __SCHED_FEAT_##name) * enabled | | |
1353 | static const_debug __maybe_unused unsigned int sysctl_sched_features = | |
1354 | #include "features.h" | |
1355 | 0; | |
1356 | #undef SCHED_FEAT | |
1357 | ||
029632fb | 1358 | #define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) |
765cc3a4 | 1359 | |
f8b6d1cc | 1360 | #endif /* SCHED_DEBUG && HAVE_JUMP_LABEL */ |
029632fb | 1361 | |
2a595721 | 1362 | extern struct static_key_false sched_numa_balancing; |
cb251765 | 1363 | extern struct static_key_false sched_schedstats; |
cbee9f88 | 1364 | |
029632fb PZ |
1365 | static inline u64 global_rt_period(void) |
1366 | { | |
1367 | return (u64)sysctl_sched_rt_period * NSEC_PER_USEC; | |
1368 | } | |
1369 | ||
1370 | static inline u64 global_rt_runtime(void) | |
1371 | { | |
1372 | if (sysctl_sched_rt_runtime < 0) | |
1373 | return RUNTIME_INF; | |
1374 | ||
1375 | return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC; | |
1376 | } | |
1377 | ||
029632fb PZ |
1378 | static inline int task_current(struct rq *rq, struct task_struct *p) |
1379 | { | |
1380 | return rq->curr == p; | |
1381 | } | |
1382 | ||
1383 | static inline int task_running(struct rq *rq, struct task_struct *p) | |
1384 | { | |
1385 | #ifdef CONFIG_SMP | |
1386 | return p->on_cpu; | |
1387 | #else | |
1388 | return task_current(rq, p); | |
1389 | #endif | |
1390 | } | |
1391 | ||
da0c1e65 KT |
1392 | static inline int task_on_rq_queued(struct task_struct *p) |
1393 | { | |
1394 | return p->on_rq == TASK_ON_RQ_QUEUED; | |
1395 | } | |
029632fb | 1396 | |
cca26e80 KT |
1397 | static inline int task_on_rq_migrating(struct task_struct *p) |
1398 | { | |
1399 | return p->on_rq == TASK_ON_RQ_MIGRATING; | |
1400 | } | |
1401 | ||
b13095f0 LZ |
1402 | /* |
1403 | * wake flags | |
1404 | */ | |
97fb7a0a IM |
1405 | #define WF_SYNC 0x01 /* Waker goes to sleep after wakeup */ |
1406 | #define WF_FORK 0x02 /* Child wakeup after fork */ | |
1407 | #define WF_MIGRATED 0x4 /* Internal use, task got migrated */ | |
b13095f0 | 1408 | |
029632fb PZ |
1409 | /* |
1410 | * To aid in avoiding the subversion of "niceness" due to uneven distribution | |
1411 | * of tasks with abnormal "nice" values across CPUs the contribution that | |
1412 | * each task makes to its run queue's load is weighted according to its | |
1413 | * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a | |
1414 | * scaled version of the new time slice allocation that they receive on time | |
1415 | * slice expiry etc. | |
1416 | */ | |
1417 | ||
97fb7a0a IM |
1418 | #define WEIGHT_IDLEPRIO 3 |
1419 | #define WMULT_IDLEPRIO 1431655765 | |
029632fb | 1420 | |
97fb7a0a IM |
1421 | extern const int sched_prio_to_weight[40]; |
1422 | extern const u32 sched_prio_to_wmult[40]; | |
029632fb | 1423 | |
ff77e468 PZ |
1424 | /* |
1425 | * {de,en}queue flags: | |
1426 | * | |
1427 | * DEQUEUE_SLEEP - task is no longer runnable | |
1428 | * ENQUEUE_WAKEUP - task just became runnable | |
1429 | * | |
1430 | * SAVE/RESTORE - an otherwise spurious dequeue/enqueue, done to ensure tasks | |
1431 | * are in a known state which allows modification. Such pairs | |
1432 | * should preserve as much state as possible. | |
1433 | * | |
1434 | * MOVE - paired with SAVE/RESTORE, explicitly does not preserve the location | |
1435 | * in the runqueue. | |
1436 | * | |
1437 | * ENQUEUE_HEAD - place at front of runqueue (tail if not specified) | |
1438 | * ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline) | |
59efa0ba | 1439 | * ENQUEUE_MIGRATED - the task was migrated during wakeup |
ff77e468 PZ |
1440 | * |
1441 | */ | |
1442 | ||
1443 | #define DEQUEUE_SLEEP 0x01 | |
97fb7a0a IM |
1444 | #define DEQUEUE_SAVE 0x02 /* Matches ENQUEUE_RESTORE */ |
1445 | #define DEQUEUE_MOVE 0x04 /* Matches ENQUEUE_MOVE */ | |
1446 | #define DEQUEUE_NOCLOCK 0x08 /* Matches ENQUEUE_NOCLOCK */ | |
ff77e468 | 1447 | |
1de64443 | 1448 | #define ENQUEUE_WAKEUP 0x01 |
ff77e468 PZ |
1449 | #define ENQUEUE_RESTORE 0x02 |
1450 | #define ENQUEUE_MOVE 0x04 | |
0a67d1ee | 1451 | #define ENQUEUE_NOCLOCK 0x08 |
ff77e468 | 1452 | |
0a67d1ee PZ |
1453 | #define ENQUEUE_HEAD 0x10 |
1454 | #define ENQUEUE_REPLENISH 0x20 | |
c82ba9fa | 1455 | #ifdef CONFIG_SMP |
0a67d1ee | 1456 | #define ENQUEUE_MIGRATED 0x40 |
c82ba9fa | 1457 | #else |
59efa0ba | 1458 | #define ENQUEUE_MIGRATED 0x00 |
c82ba9fa | 1459 | #endif |
c82ba9fa | 1460 | |
37e117c0 PZ |
1461 | #define RETRY_TASK ((void *)-1UL) |
1462 | ||
c82ba9fa LZ |
1463 | struct sched_class { |
1464 | const struct sched_class *next; | |
1465 | ||
1466 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); | |
1467 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); | |
97fb7a0a IM |
1468 | void (*yield_task) (struct rq *rq); |
1469 | bool (*yield_to_task)(struct rq *rq, struct task_struct *p, bool preempt); | |
c82ba9fa | 1470 | |
97fb7a0a | 1471 | void (*check_preempt_curr)(struct rq *rq, struct task_struct *p, int flags); |
c82ba9fa | 1472 | |
606dba2e PZ |
1473 | /* |
1474 | * It is the responsibility of the pick_next_task() method that will | |
1475 | * return the next task to call put_prev_task() on the @prev task or | |
1476 | * something equivalent. | |
37e117c0 PZ |
1477 | * |
1478 | * May return RETRY_TASK when it finds a higher prio class has runnable | |
1479 | * tasks. | |
606dba2e | 1480 | */ |
97fb7a0a IM |
1481 | struct task_struct * (*pick_next_task)(struct rq *rq, |
1482 | struct task_struct *prev, | |
1483 | struct rq_flags *rf); | |
1484 | void (*put_prev_task)(struct rq *rq, struct task_struct *p); | |
c82ba9fa LZ |
1485 | |
1486 | #ifdef CONFIG_SMP | |
ac66f547 | 1487 | int (*select_task_rq)(struct task_struct *p, int task_cpu, int sd_flag, int flags); |
5a4fd036 | 1488 | void (*migrate_task_rq)(struct task_struct *p); |
c82ba9fa | 1489 | |
97fb7a0a | 1490 | void (*task_woken)(struct rq *this_rq, struct task_struct *task); |
c82ba9fa LZ |
1491 | |
1492 | void (*set_cpus_allowed)(struct task_struct *p, | |
1493 | const struct cpumask *newmask); | |
1494 | ||
1495 | void (*rq_online)(struct rq *rq); | |
1496 | void (*rq_offline)(struct rq *rq); | |
1497 | #endif | |
1498 | ||
97fb7a0a IM |
1499 | void (*set_curr_task)(struct rq *rq); |
1500 | void (*task_tick)(struct rq *rq, struct task_struct *p, int queued); | |
1501 | void (*task_fork)(struct task_struct *p); | |
1502 | void (*task_dead)(struct task_struct *p); | |
c82ba9fa | 1503 | |
67dfa1b7 KT |
1504 | /* |
1505 | * The switched_from() call is allowed to drop rq->lock, therefore we | |
1506 | * cannot assume the switched_from/switched_to pair is serliazed by | |
1507 | * rq->lock. They are however serialized by p->pi_lock. | |
1508 | */ | |
97fb7a0a IM |
1509 | void (*switched_from)(struct rq *this_rq, struct task_struct *task); |
1510 | void (*switched_to) (struct rq *this_rq, struct task_struct *task); | |
c82ba9fa | 1511 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, |
97fb7a0a | 1512 | int oldprio); |
c82ba9fa | 1513 | |
97fb7a0a IM |
1514 | unsigned int (*get_rr_interval)(struct rq *rq, |
1515 | struct task_struct *task); | |
c82ba9fa | 1516 | |
97fb7a0a | 1517 | void (*update_curr)(struct rq *rq); |
6e998916 | 1518 | |
97fb7a0a IM |
1519 | #define TASK_SET_GROUP 0 |
1520 | #define TASK_MOVE_GROUP 1 | |
ea86cb4b | 1521 | |
c82ba9fa | 1522 | #ifdef CONFIG_FAIR_GROUP_SCHED |
97fb7a0a | 1523 | void (*task_change_group)(struct task_struct *p, int type); |
c82ba9fa LZ |
1524 | #endif |
1525 | }; | |
029632fb | 1526 | |
3f1d2a31 PZ |
1527 | static inline void put_prev_task(struct rq *rq, struct task_struct *prev) |
1528 | { | |
1529 | prev->sched_class->put_prev_task(rq, prev); | |
1530 | } | |
1531 | ||
b2bf6c31 PZ |
1532 | static inline void set_curr_task(struct rq *rq, struct task_struct *curr) |
1533 | { | |
1534 | curr->sched_class->set_curr_task(rq); | |
1535 | } | |
1536 | ||
f5832c19 | 1537 | #ifdef CONFIG_SMP |
029632fb | 1538 | #define sched_class_highest (&stop_sched_class) |
f5832c19 NP |
1539 | #else |
1540 | #define sched_class_highest (&dl_sched_class) | |
1541 | #endif | |
029632fb PZ |
1542 | #define for_each_class(class) \ |
1543 | for (class = sched_class_highest; class; class = class->next) | |
1544 | ||
1545 | extern const struct sched_class stop_sched_class; | |
aab03e05 | 1546 | extern const struct sched_class dl_sched_class; |
029632fb PZ |
1547 | extern const struct sched_class rt_sched_class; |
1548 | extern const struct sched_class fair_sched_class; | |
1549 | extern const struct sched_class idle_sched_class; | |
1550 | ||
1551 | ||
1552 | #ifdef CONFIG_SMP | |
1553 | ||
63b2ca30 | 1554 | extern void update_group_capacity(struct sched_domain *sd, int cpu); |
b719203b | 1555 | |
7caff66f | 1556 | extern void trigger_load_balance(struct rq *rq); |
029632fb | 1557 | |
c5b28038 PZ |
1558 | extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask); |
1559 | ||
029632fb PZ |
1560 | #endif |
1561 | ||
442bf3aa DL |
1562 | #ifdef CONFIG_CPU_IDLE |
1563 | static inline void idle_set_state(struct rq *rq, | |
1564 | struct cpuidle_state *idle_state) | |
1565 | { | |
1566 | rq->idle_state = idle_state; | |
1567 | } | |
1568 | ||
1569 | static inline struct cpuidle_state *idle_get_state(struct rq *rq) | |
1570 | { | |
9148a3a1 | 1571 | SCHED_WARN_ON(!rcu_read_lock_held()); |
97fb7a0a | 1572 | |
442bf3aa DL |
1573 | return rq->idle_state; |
1574 | } | |
1575 | #else | |
1576 | static inline void idle_set_state(struct rq *rq, | |
1577 | struct cpuidle_state *idle_state) | |
1578 | { | |
1579 | } | |
1580 | ||
1581 | static inline struct cpuidle_state *idle_get_state(struct rq *rq) | |
1582 | { | |
1583 | return NULL; | |
1584 | } | |
1585 | #endif | |
1586 | ||
8663effb SRV |
1587 | extern void schedule_idle(void); |
1588 | ||
029632fb PZ |
1589 | extern void sysrq_sched_debug_show(void); |
1590 | extern void sched_init_granularity(void); | |
1591 | extern void update_max_interval(void); | |
1baca4ce JL |
1592 | |
1593 | extern void init_sched_dl_class(void); | |
029632fb PZ |
1594 | extern void init_sched_rt_class(void); |
1595 | extern void init_sched_fair_class(void); | |
1596 | ||
9059393e VG |
1597 | extern void reweight_task(struct task_struct *p, int prio); |
1598 | ||
8875125e | 1599 | extern void resched_curr(struct rq *rq); |
029632fb PZ |
1600 | extern void resched_cpu(int cpu); |
1601 | ||
1602 | extern struct rt_bandwidth def_rt_bandwidth; | |
1603 | extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime); | |
1604 | ||
332ac17e DF |
1605 | extern struct dl_bandwidth def_dl_bandwidth; |
1606 | extern void init_dl_bandwidth(struct dl_bandwidth *dl_b, u64 period, u64 runtime); | |
aab03e05 | 1607 | extern void init_dl_task_timer(struct sched_dl_entity *dl_se); |
209a0cbd | 1608 | extern void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se); |
4da3abce | 1609 | extern void init_dl_rq_bw_ratio(struct dl_rq *dl_rq); |
aab03e05 | 1610 | |
97fb7a0a IM |
1611 | #define BW_SHIFT 20 |
1612 | #define BW_UNIT (1 << BW_SHIFT) | |
1613 | #define RATIO_SHIFT 8 | |
332ac17e DF |
1614 | unsigned long to_ratio(u64 period, u64 runtime); |
1615 | ||
540247fb | 1616 | extern void init_entity_runnable_average(struct sched_entity *se); |
2b8c41da | 1617 | extern void post_init_entity_util_avg(struct sched_entity *se); |
a75cdaa9 | 1618 | |
76d92ac3 FW |
1619 | #ifdef CONFIG_NO_HZ_FULL |
1620 | extern bool sched_can_stop_tick(struct rq *rq); | |
d84b3131 | 1621 | extern int __init sched_tick_offload_init(void); |
76d92ac3 FW |
1622 | |
1623 | /* | |
1624 | * Tick may be needed by tasks in the runqueue depending on their policy and | |
1625 | * requirements. If tick is needed, lets send the target an IPI to kick it out of | |
1626 | * nohz mode if necessary. | |
1627 | */ | |
1628 | static inline void sched_update_tick_dependency(struct rq *rq) | |
1629 | { | |
1630 | int cpu; | |
1631 | ||
1632 | if (!tick_nohz_full_enabled()) | |
1633 | return; | |
1634 | ||
1635 | cpu = cpu_of(rq); | |
1636 | ||
1637 | if (!tick_nohz_full_cpu(cpu)) | |
1638 | return; | |
1639 | ||
1640 | if (sched_can_stop_tick(rq)) | |
1641 | tick_nohz_dep_clear_cpu(cpu, TICK_DEP_BIT_SCHED); | |
1642 | else | |
1643 | tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED); | |
1644 | } | |
1645 | #else | |
d84b3131 | 1646 | static inline int sched_tick_offload_init(void) { return 0; } |
76d92ac3 FW |
1647 | static inline void sched_update_tick_dependency(struct rq *rq) { } |
1648 | #endif | |
1649 | ||
72465447 | 1650 | static inline void add_nr_running(struct rq *rq, unsigned count) |
029632fb | 1651 | { |
72465447 KT |
1652 | unsigned prev_nr = rq->nr_running; |
1653 | ||
1654 | rq->nr_running = prev_nr + count; | |
9f3660c2 | 1655 | |
72465447 | 1656 | if (prev_nr < 2 && rq->nr_running >= 2) { |
4486edd1 TC |
1657 | #ifdef CONFIG_SMP |
1658 | if (!rq->rd->overload) | |
1659 | rq->rd->overload = true; | |
1660 | #endif | |
4486edd1 | 1661 | } |
76d92ac3 FW |
1662 | |
1663 | sched_update_tick_dependency(rq); | |
029632fb PZ |
1664 | } |
1665 | ||
72465447 | 1666 | static inline void sub_nr_running(struct rq *rq, unsigned count) |
029632fb | 1667 | { |
72465447 | 1668 | rq->nr_running -= count; |
76d92ac3 FW |
1669 | /* Check if we still need preemption */ |
1670 | sched_update_tick_dependency(rq); | |
029632fb PZ |
1671 | } |
1672 | ||
1673 | extern void update_rq_clock(struct rq *rq); | |
1674 | ||
1675 | extern void activate_task(struct rq *rq, struct task_struct *p, int flags); | |
1676 | extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags); | |
1677 | ||
1678 | extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags); | |
1679 | ||
1680 | extern const_debug unsigned int sysctl_sched_time_avg; | |
1681 | extern const_debug unsigned int sysctl_sched_nr_migrate; | |
1682 | extern const_debug unsigned int sysctl_sched_migration_cost; | |
1683 | ||
1684 | static inline u64 sched_avg_period(void) | |
1685 | { | |
1686 | return (u64)sysctl_sched_time_avg * NSEC_PER_MSEC / 2; | |
1687 | } | |
1688 | ||
029632fb PZ |
1689 | #ifdef CONFIG_SCHED_HRTICK |
1690 | ||
1691 | /* | |
1692 | * Use hrtick when: | |
1693 | * - enabled by features | |
1694 | * - hrtimer is actually high res | |
1695 | */ | |
1696 | static inline int hrtick_enabled(struct rq *rq) | |
1697 | { | |
1698 | if (!sched_feat(HRTICK)) | |
1699 | return 0; | |
1700 | if (!cpu_active(cpu_of(rq))) | |
1701 | return 0; | |
1702 | return hrtimer_is_hres_active(&rq->hrtick_timer); | |
1703 | } | |
1704 | ||
1705 | void hrtick_start(struct rq *rq, u64 delay); | |
1706 | ||
b39e66ea MG |
1707 | #else |
1708 | ||
1709 | static inline int hrtick_enabled(struct rq *rq) | |
1710 | { | |
1711 | return 0; | |
1712 | } | |
1713 | ||
029632fb PZ |
1714 | #endif /* CONFIG_SCHED_HRTICK */ |
1715 | ||
dfbca41f PZ |
1716 | #ifndef arch_scale_freq_capacity |
1717 | static __always_inline | |
7673c8a4 | 1718 | unsigned long arch_scale_freq_capacity(int cpu) |
dfbca41f PZ |
1719 | { |
1720 | return SCHED_CAPACITY_SCALE; | |
1721 | } | |
1722 | #endif | |
b5b4860d | 1723 | |
7e1a9208 JL |
1724 | #ifdef CONFIG_SMP |
1725 | extern void sched_avg_update(struct rq *rq); | |
1726 | ||
8cd5601c MR |
1727 | #ifndef arch_scale_cpu_capacity |
1728 | static __always_inline | |
1729 | unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu) | |
1730 | { | |
e3279a2e | 1731 | if (sd && (sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1)) |
8cd5601c MR |
1732 | return sd->smt_gain / sd->span_weight; |
1733 | ||
1734 | return SCHED_CAPACITY_SCALE; | |
1735 | } | |
1736 | #endif | |
1737 | ||
029632fb PZ |
1738 | static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) |
1739 | { | |
7673c8a4 | 1740 | rq->rt_avg += rt_delta * arch_scale_freq_capacity(cpu_of(rq)); |
029632fb PZ |
1741 | sched_avg_update(rq); |
1742 | } | |
1743 | #else | |
7e1a9208 JL |
1744 | #ifndef arch_scale_cpu_capacity |
1745 | static __always_inline | |
1746 | unsigned long arch_scale_cpu_capacity(void __always_unused *sd, int cpu) | |
1747 | { | |
1748 | return SCHED_CAPACITY_SCALE; | |
1749 | } | |
1750 | #endif | |
029632fb PZ |
1751 | static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { } |
1752 | static inline void sched_avg_update(struct rq *rq) { } | |
1753 | #endif | |
1754 | ||
eb580751 | 1755 | struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf) |
3e71a462 | 1756 | __acquires(rq->lock); |
8a8c69c3 | 1757 | |
eb580751 | 1758 | struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf) |
3960c8c0 | 1759 | __acquires(p->pi_lock) |
3e71a462 | 1760 | __acquires(rq->lock); |
3960c8c0 | 1761 | |
eb580751 | 1762 | static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf) |
3960c8c0 PZ |
1763 | __releases(rq->lock) |
1764 | { | |
d8ac8971 | 1765 | rq_unpin_lock(rq, rf); |
3960c8c0 PZ |
1766 | raw_spin_unlock(&rq->lock); |
1767 | } | |
1768 | ||
1769 | static inline void | |
eb580751 | 1770 | task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf) |
3960c8c0 PZ |
1771 | __releases(rq->lock) |
1772 | __releases(p->pi_lock) | |
1773 | { | |
d8ac8971 | 1774 | rq_unpin_lock(rq, rf); |
3960c8c0 | 1775 | raw_spin_unlock(&rq->lock); |
eb580751 | 1776 | raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags); |
3960c8c0 PZ |
1777 | } |
1778 | ||
8a8c69c3 PZ |
1779 | static inline void |
1780 | rq_lock_irqsave(struct rq *rq, struct rq_flags *rf) | |
1781 | __acquires(rq->lock) | |
1782 | { | |
1783 | raw_spin_lock_irqsave(&rq->lock, rf->flags); | |
1784 | rq_pin_lock(rq, rf); | |
1785 | } | |
1786 | ||
1787 | static inline void | |
1788 | rq_lock_irq(struct rq *rq, struct rq_flags *rf) | |
1789 | __acquires(rq->lock) | |
1790 | { | |
1791 | raw_spin_lock_irq(&rq->lock); | |
1792 | rq_pin_lock(rq, rf); | |
1793 | } | |
1794 | ||
1795 | static inline void | |
1796 | rq_lock(struct rq *rq, struct rq_flags *rf) | |
1797 | __acquires(rq->lock) | |
1798 | { | |
1799 | raw_spin_lock(&rq->lock); | |
1800 | rq_pin_lock(rq, rf); | |
1801 | } | |
1802 | ||
1803 | static inline void | |
1804 | rq_relock(struct rq *rq, struct rq_flags *rf) | |
1805 | __acquires(rq->lock) | |
1806 | { | |
1807 | raw_spin_lock(&rq->lock); | |
1808 | rq_repin_lock(rq, rf); | |
1809 | } | |
1810 | ||
1811 | static inline void | |
1812 | rq_unlock_irqrestore(struct rq *rq, struct rq_flags *rf) | |
1813 | __releases(rq->lock) | |
1814 | { | |
1815 | rq_unpin_lock(rq, rf); | |
1816 | raw_spin_unlock_irqrestore(&rq->lock, rf->flags); | |
1817 | } | |
1818 | ||
1819 | static inline void | |
1820 | rq_unlock_irq(struct rq *rq, struct rq_flags *rf) | |
1821 | __releases(rq->lock) | |
1822 | { | |
1823 | rq_unpin_lock(rq, rf); | |
1824 | raw_spin_unlock_irq(&rq->lock); | |
1825 | } | |
1826 | ||
1827 | static inline void | |
1828 | rq_unlock(struct rq *rq, struct rq_flags *rf) | |
1829 | __releases(rq->lock) | |
1830 | { | |
1831 | rq_unpin_lock(rq, rf); | |
1832 | raw_spin_unlock(&rq->lock); | |
1833 | } | |
1834 | ||
029632fb PZ |
1835 | #ifdef CONFIG_SMP |
1836 | #ifdef CONFIG_PREEMPT | |
1837 | ||
1838 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2); | |
1839 | ||
1840 | /* | |
1841 | * fair double_lock_balance: Safely acquires both rq->locks in a fair | |
1842 | * way at the expense of forcing extra atomic operations in all | |
1843 | * invocations. This assures that the double_lock is acquired using the | |
1844 | * same underlying policy as the spinlock_t on this architecture, which | |
1845 | * reduces latency compared to the unfair variant below. However, it | |
1846 | * also adds more overhead and therefore may reduce throughput. | |
1847 | */ | |
1848 | static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
1849 | __releases(this_rq->lock) | |
1850 | __acquires(busiest->lock) | |
1851 | __acquires(this_rq->lock) | |
1852 | { | |
1853 | raw_spin_unlock(&this_rq->lock); | |
1854 | double_rq_lock(this_rq, busiest); | |
1855 | ||
1856 | return 1; | |
1857 | } | |
1858 | ||
1859 | #else | |
1860 | /* | |
1861 | * Unfair double_lock_balance: Optimizes throughput at the expense of | |
1862 | * latency by eliminating extra atomic operations when the locks are | |
97fb7a0a IM |
1863 | * already in proper order on entry. This favors lower CPU-ids and will |
1864 | * grant the double lock to lower CPUs over higher ids under contention, | |
029632fb PZ |
1865 | * regardless of entry order into the function. |
1866 | */ | |
1867 | static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
1868 | __releases(this_rq->lock) | |
1869 | __acquires(busiest->lock) | |
1870 | __acquires(this_rq->lock) | |
1871 | { | |
1872 | int ret = 0; | |
1873 | ||
1874 | if (unlikely(!raw_spin_trylock(&busiest->lock))) { | |
1875 | if (busiest < this_rq) { | |
1876 | raw_spin_unlock(&this_rq->lock); | |
1877 | raw_spin_lock(&busiest->lock); | |
1878 | raw_spin_lock_nested(&this_rq->lock, | |
1879 | SINGLE_DEPTH_NESTING); | |
1880 | ret = 1; | |
1881 | } else | |
1882 | raw_spin_lock_nested(&busiest->lock, | |
1883 | SINGLE_DEPTH_NESTING); | |
1884 | } | |
1885 | return ret; | |
1886 | } | |
1887 | ||
1888 | #endif /* CONFIG_PREEMPT */ | |
1889 | ||
1890 | /* | |
1891 | * double_lock_balance - lock the busiest runqueue, this_rq is locked already. | |
1892 | */ | |
1893 | static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
1894 | { | |
1895 | if (unlikely(!irqs_disabled())) { | |
97fb7a0a | 1896 | /* printk() doesn't work well under rq->lock */ |
029632fb PZ |
1897 | raw_spin_unlock(&this_rq->lock); |
1898 | BUG_ON(1); | |
1899 | } | |
1900 | ||
1901 | return _double_lock_balance(this_rq, busiest); | |
1902 | } | |
1903 | ||
1904 | static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest) | |
1905 | __releases(busiest->lock) | |
1906 | { | |
1907 | raw_spin_unlock(&busiest->lock); | |
1908 | lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_); | |
1909 | } | |
1910 | ||
74602315 PZ |
1911 | static inline void double_lock(spinlock_t *l1, spinlock_t *l2) |
1912 | { | |
1913 | if (l1 > l2) | |
1914 | swap(l1, l2); | |
1915 | ||
1916 | spin_lock(l1); | |
1917 | spin_lock_nested(l2, SINGLE_DEPTH_NESTING); | |
1918 | } | |
1919 | ||
60e69eed MG |
1920 | static inline void double_lock_irq(spinlock_t *l1, spinlock_t *l2) |
1921 | { | |
1922 | if (l1 > l2) | |
1923 | swap(l1, l2); | |
1924 | ||
1925 | spin_lock_irq(l1); | |
1926 | spin_lock_nested(l2, SINGLE_DEPTH_NESTING); | |
1927 | } | |
1928 | ||
74602315 PZ |
1929 | static inline void double_raw_lock(raw_spinlock_t *l1, raw_spinlock_t *l2) |
1930 | { | |
1931 | if (l1 > l2) | |
1932 | swap(l1, l2); | |
1933 | ||
1934 | raw_spin_lock(l1); | |
1935 | raw_spin_lock_nested(l2, SINGLE_DEPTH_NESTING); | |
1936 | } | |
1937 | ||
029632fb PZ |
1938 | /* |
1939 | * double_rq_lock - safely lock two runqueues | |
1940 | * | |
1941 | * Note this does not disable interrupts like task_rq_lock, | |
1942 | * you need to do so manually before calling. | |
1943 | */ | |
1944 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) | |
1945 | __acquires(rq1->lock) | |
1946 | __acquires(rq2->lock) | |
1947 | { | |
1948 | BUG_ON(!irqs_disabled()); | |
1949 | if (rq1 == rq2) { | |
1950 | raw_spin_lock(&rq1->lock); | |
1951 | __acquire(rq2->lock); /* Fake it out ;) */ | |
1952 | } else { | |
1953 | if (rq1 < rq2) { | |
1954 | raw_spin_lock(&rq1->lock); | |
1955 | raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING); | |
1956 | } else { | |
1957 | raw_spin_lock(&rq2->lock); | |
1958 | raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING); | |
1959 | } | |
1960 | } | |
1961 | } | |
1962 | ||
1963 | /* | |
1964 | * double_rq_unlock - safely unlock two runqueues | |
1965 | * | |
1966 | * Note this does not restore interrupts like task_rq_unlock, | |
1967 | * you need to do so manually after calling. | |
1968 | */ | |
1969 | static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) | |
1970 | __releases(rq1->lock) | |
1971 | __releases(rq2->lock) | |
1972 | { | |
1973 | raw_spin_unlock(&rq1->lock); | |
1974 | if (rq1 != rq2) | |
1975 | raw_spin_unlock(&rq2->lock); | |
1976 | else | |
1977 | __release(rq2->lock); | |
1978 | } | |
1979 | ||
f2cb1360 IM |
1980 | extern void set_rq_online (struct rq *rq); |
1981 | extern void set_rq_offline(struct rq *rq); | |
1982 | extern bool sched_smp_initialized; | |
1983 | ||
029632fb PZ |
1984 | #else /* CONFIG_SMP */ |
1985 | ||
1986 | /* | |
1987 | * double_rq_lock - safely lock two runqueues | |
1988 | * | |
1989 | * Note this does not disable interrupts like task_rq_lock, | |
1990 | * you need to do so manually before calling. | |
1991 | */ | |
1992 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) | |
1993 | __acquires(rq1->lock) | |
1994 | __acquires(rq2->lock) | |
1995 | { | |
1996 | BUG_ON(!irqs_disabled()); | |
1997 | BUG_ON(rq1 != rq2); | |
1998 | raw_spin_lock(&rq1->lock); | |
1999 | __acquire(rq2->lock); /* Fake it out ;) */ | |
2000 | } | |
2001 | ||
2002 | /* | |
2003 | * double_rq_unlock - safely unlock two runqueues | |
2004 | * | |
2005 | * Note this does not restore interrupts like task_rq_unlock, | |
2006 | * you need to do so manually after calling. | |
2007 | */ | |
2008 | static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) | |
2009 | __releases(rq1->lock) | |
2010 | __releases(rq2->lock) | |
2011 | { | |
2012 | BUG_ON(rq1 != rq2); | |
2013 | raw_spin_unlock(&rq1->lock); | |
2014 | __release(rq2->lock); | |
2015 | } | |
2016 | ||
2017 | #endif | |
2018 | ||
2019 | extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq); | |
2020 | extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq); | |
6b55c965 SD |
2021 | |
2022 | #ifdef CONFIG_SCHED_DEBUG | |
9469eb01 PZ |
2023 | extern bool sched_debug_enabled; |
2024 | ||
029632fb PZ |
2025 | extern void print_cfs_stats(struct seq_file *m, int cpu); |
2026 | extern void print_rt_stats(struct seq_file *m, int cpu); | |
acb32132 | 2027 | extern void print_dl_stats(struct seq_file *m, int cpu); |
6b55c965 SD |
2028 | extern void |
2029 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); | |
397f2378 SD |
2030 | #ifdef CONFIG_NUMA_BALANCING |
2031 | extern void | |
2032 | show_numa_stats(struct task_struct *p, struct seq_file *m); | |
2033 | extern void | |
2034 | print_numa_stats(struct seq_file *m, int node, unsigned long tsf, | |
2035 | unsigned long tpf, unsigned long gsf, unsigned long gpf); | |
2036 | #endif /* CONFIG_NUMA_BALANCING */ | |
2037 | #endif /* CONFIG_SCHED_DEBUG */ | |
029632fb PZ |
2038 | |
2039 | extern void init_cfs_rq(struct cfs_rq *cfs_rq); | |
07c54f7a AV |
2040 | extern void init_rt_rq(struct rt_rq *rt_rq); |
2041 | extern void init_dl_rq(struct dl_rq *dl_rq); | |
029632fb | 2042 | |
1ee14e6c BS |
2043 | extern void cfs_bandwidth_usage_inc(void); |
2044 | extern void cfs_bandwidth_usage_dec(void); | |
1c792db7 | 2045 | |
3451d024 | 2046 | #ifdef CONFIG_NO_HZ_COMMON |
00357f5e PZ |
2047 | #define NOHZ_BALANCE_KICK_BIT 0 |
2048 | #define NOHZ_STATS_KICK_BIT 1 | |
a22e47a4 | 2049 | |
a22e47a4 | 2050 | #define NOHZ_BALANCE_KICK BIT(NOHZ_BALANCE_KICK_BIT) |
b7031a02 PZ |
2051 | #define NOHZ_STATS_KICK BIT(NOHZ_STATS_KICK_BIT) |
2052 | ||
2053 | #define NOHZ_KICK_MASK (NOHZ_BALANCE_KICK | NOHZ_STATS_KICK) | |
1c792db7 SS |
2054 | |
2055 | #define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags) | |
20a5c8cc | 2056 | |
00357f5e | 2057 | extern void nohz_balance_exit_idle(struct rq *rq); |
20a5c8cc | 2058 | #else |
00357f5e | 2059 | static inline void nohz_balance_exit_idle(struct rq *rq) { } |
1c792db7 | 2060 | #endif |
73fbec60 | 2061 | |
daec5798 LA |
2062 | |
2063 | #ifdef CONFIG_SMP | |
2064 | static inline | |
2065 | void __dl_update(struct dl_bw *dl_b, s64 bw) | |
2066 | { | |
2067 | struct root_domain *rd = container_of(dl_b, struct root_domain, dl_bw); | |
2068 | int i; | |
2069 | ||
2070 | RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(), | |
2071 | "sched RCU must be held"); | |
2072 | for_each_cpu_and(i, rd->span, cpu_active_mask) { | |
2073 | struct rq *rq = cpu_rq(i); | |
2074 | ||
2075 | rq->dl.extra_bw += bw; | |
2076 | } | |
2077 | } | |
2078 | #else | |
2079 | static inline | |
2080 | void __dl_update(struct dl_bw *dl_b, s64 bw) | |
2081 | { | |
2082 | struct dl_rq *dl = container_of(dl_b, struct dl_rq, dl_bw); | |
2083 | ||
2084 | dl->extra_bw += bw; | |
2085 | } | |
2086 | #endif | |
2087 | ||
2088 | ||
73fbec60 | 2089 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
19d23dbf | 2090 | struct irqtime { |
25e2d8c1 | 2091 | u64 total; |
a499a5a1 | 2092 | u64 tick_delta; |
19d23dbf FW |
2093 | u64 irq_start_time; |
2094 | struct u64_stats_sync sync; | |
2095 | }; | |
73fbec60 | 2096 | |
19d23dbf | 2097 | DECLARE_PER_CPU(struct irqtime, cpu_irqtime); |
73fbec60 | 2098 | |
25e2d8c1 FW |
2099 | /* |
2100 | * Returns the irqtime minus the softirq time computed by ksoftirqd. | |
2101 | * Otherwise ksoftirqd's sum_exec_runtime is substracted its own runtime | |
2102 | * and never move forward. | |
2103 | */ | |
73fbec60 FW |
2104 | static inline u64 irq_time_read(int cpu) |
2105 | { | |
19d23dbf FW |
2106 | struct irqtime *irqtime = &per_cpu(cpu_irqtime, cpu); |
2107 | unsigned int seq; | |
2108 | u64 total; | |
73fbec60 FW |
2109 | |
2110 | do { | |
19d23dbf | 2111 | seq = __u64_stats_fetch_begin(&irqtime->sync); |
25e2d8c1 | 2112 | total = irqtime->total; |
19d23dbf | 2113 | } while (__u64_stats_fetch_retry(&irqtime->sync, seq)); |
73fbec60 | 2114 | |
19d23dbf | 2115 | return total; |
73fbec60 | 2116 | } |
73fbec60 | 2117 | #endif /* CONFIG_IRQ_TIME_ACCOUNTING */ |
adaf9fcd RW |
2118 | |
2119 | #ifdef CONFIG_CPU_FREQ | |
2120 | DECLARE_PER_CPU(struct update_util_data *, cpufreq_update_util_data); | |
2121 | ||
2122 | /** | |
2123 | * cpufreq_update_util - Take a note about CPU utilization changes. | |
12bde33d | 2124 | * @rq: Runqueue to carry out the update for. |
58919e83 | 2125 | * @flags: Update reason flags. |
adaf9fcd | 2126 | * |
58919e83 RW |
2127 | * This function is called by the scheduler on the CPU whose utilization is |
2128 | * being updated. | |
adaf9fcd RW |
2129 | * |
2130 | * It can only be called from RCU-sched read-side critical sections. | |
adaf9fcd RW |
2131 | * |
2132 | * The way cpufreq is currently arranged requires it to evaluate the CPU | |
2133 | * performance state (frequency/voltage) on a regular basis to prevent it from | |
2134 | * being stuck in a completely inadequate performance level for too long. | |
e0367b12 JL |
2135 | * That is not guaranteed to happen if the updates are only triggered from CFS |
2136 | * and DL, though, because they may not be coming in if only RT tasks are | |
2137 | * active all the time (or there are RT tasks only). | |
adaf9fcd | 2138 | * |
e0367b12 JL |
2139 | * As a workaround for that issue, this function is called periodically by the |
2140 | * RT sched class to trigger extra cpufreq updates to prevent it from stalling, | |
adaf9fcd | 2141 | * but that really is a band-aid. Going forward it should be replaced with |
e0367b12 | 2142 | * solutions targeted more specifically at RT tasks. |
adaf9fcd | 2143 | */ |
12bde33d | 2144 | static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) |
adaf9fcd | 2145 | { |
58919e83 RW |
2146 | struct update_util_data *data; |
2147 | ||
674e7541 VK |
2148 | data = rcu_dereference_sched(*per_cpu_ptr(&cpufreq_update_util_data, |
2149 | cpu_of(rq))); | |
58919e83 | 2150 | if (data) |
12bde33d RW |
2151 | data->func(data, rq_clock(rq), flags); |
2152 | } | |
adaf9fcd | 2153 | #else |
12bde33d | 2154 | static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {} |
adaf9fcd | 2155 | #endif /* CONFIG_CPU_FREQ */ |
be53f58f | 2156 | |
9bdcb44e | 2157 | #ifdef arch_scale_freq_capacity |
97fb7a0a IM |
2158 | # ifndef arch_scale_freq_invariant |
2159 | # define arch_scale_freq_invariant() true | |
2160 | # endif | |
2161 | #else | |
2162 | # define arch_scale_freq_invariant() false | |
9bdcb44e | 2163 | #endif |
d4edd662 | 2164 | |
794a56eb | 2165 | #ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL |
d4edd662 JL |
2166 | static inline unsigned long cpu_util_dl(struct rq *rq) |
2167 | { | |
2168 | return (rq->dl.running_bw * SCHED_CAPACITY_SCALE) >> BW_SHIFT; | |
2169 | } | |
2170 | ||
2171 | static inline unsigned long cpu_util_cfs(struct rq *rq) | |
2172 | { | |
a07630b8 PB |
2173 | unsigned long util = READ_ONCE(rq->cfs.avg.util_avg); |
2174 | ||
2175 | if (sched_feat(UTIL_EST)) { | |
2176 | util = max_t(unsigned long, util, | |
2177 | READ_ONCE(rq->cfs.avg.util_est.enqueued)); | |
2178 | } | |
2179 | ||
2180 | return util; | |
d4edd662 | 2181 | } |
794a56eb | 2182 | #endif |