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029632fb PZ |
1 | |
2 | #include <linux/sched.h> | |
cf4aebc2 | 3 | #include <linux/sched/sysctl.h> |
8bd75c77 | 4 | #include <linux/sched/rt.h> |
aab03e05 | 5 | #include <linux/sched/deadline.h> |
3866e845 | 6 | #include <linux/binfmts.h> |
029632fb PZ |
7 | #include <linux/mutex.h> |
8 | #include <linux/spinlock.h> | |
9 | #include <linux/stop_machine.h> | |
b6366f04 | 10 | #include <linux/irq_work.h> |
9f3660c2 | 11 | #include <linux/tick.h> |
f809ca9a | 12 | #include <linux/slab.h> |
029632fb | 13 | |
391e43da | 14 | #include "cpupri.h" |
6bfd6d72 | 15 | #include "cpudeadline.h" |
60fed789 | 16 | #include "cpuacct.h" |
029632fb | 17 | |
45ceebf7 | 18 | struct rq; |
442bf3aa | 19 | struct cpuidle_state; |
45ceebf7 | 20 | |
da0c1e65 KT |
21 | /* task_struct::on_rq states: */ |
22 | #define TASK_ON_RQ_QUEUED 1 | |
cca26e80 | 23 | #define TASK_ON_RQ_MIGRATING 2 |
da0c1e65 | 24 | |
029632fb PZ |
25 | extern __read_mostly int scheduler_running; |
26 | ||
45ceebf7 PG |
27 | extern unsigned long calc_load_update; |
28 | extern atomic_long_t calc_load_tasks; | |
29 | ||
3289bdb4 | 30 | extern void calc_global_load_tick(struct rq *this_rq); |
45ceebf7 | 31 | extern long calc_load_fold_active(struct rq *this_rq); |
3289bdb4 PZ |
32 | |
33 | #ifdef CONFIG_SMP | |
45ceebf7 | 34 | extern void update_cpu_load_active(struct rq *this_rq); |
3289bdb4 PZ |
35 | #else |
36 | static inline void update_cpu_load_active(struct rq *this_rq) { } | |
37 | #endif | |
45ceebf7 | 38 | |
029632fb PZ |
39 | /* |
40 | * Helpers for converting nanosecond timing to jiffy resolution | |
41 | */ | |
42 | #define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ)) | |
43 | ||
cc1f4b1f LZ |
44 | /* |
45 | * Increase resolution of nice-level calculations for 64-bit architectures. | |
46 | * The extra resolution improves shares distribution and load balancing of | |
47 | * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup | |
48 | * hierarchies, especially on larger systems. This is not a user-visible change | |
49 | * and does not change the user-interface for setting shares/weights. | |
50 | * | |
51 | * We increase resolution only if we have enough bits to allow this increased | |
52 | * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution | |
53 | * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the | |
54 | * increased costs. | |
55 | */ | |
56 | #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */ | |
57 | # define SCHED_LOAD_RESOLUTION 10 | |
58 | # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION) | |
59 | # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION) | |
60 | #else | |
61 | # define SCHED_LOAD_RESOLUTION 0 | |
62 | # define scale_load(w) (w) | |
63 | # define scale_load_down(w) (w) | |
64 | #endif | |
65 | ||
66 | #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION) | |
67 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) | |
68 | ||
029632fb PZ |
69 | #define NICE_0_LOAD SCHED_LOAD_SCALE |
70 | #define NICE_0_SHIFT SCHED_LOAD_SHIFT | |
71 | ||
332ac17e DF |
72 | /* |
73 | * Single value that decides SCHED_DEADLINE internal math precision. | |
74 | * 10 -> just above 1us | |
75 | * 9 -> just above 0.5us | |
76 | */ | |
77 | #define DL_SCALE (10) | |
78 | ||
029632fb PZ |
79 | /* |
80 | * These are the 'tuning knobs' of the scheduler: | |
029632fb | 81 | */ |
029632fb PZ |
82 | |
83 | /* | |
84 | * single value that denotes runtime == period, ie unlimited time. | |
85 | */ | |
86 | #define RUNTIME_INF ((u64)~0ULL) | |
87 | ||
20f9cd2a HA |
88 | static inline int idle_policy(int policy) |
89 | { | |
90 | return policy == SCHED_IDLE; | |
91 | } | |
d50dde5a DF |
92 | static inline int fair_policy(int policy) |
93 | { | |
94 | return policy == SCHED_NORMAL || policy == SCHED_BATCH; | |
95 | } | |
96 | ||
029632fb PZ |
97 | static inline int rt_policy(int policy) |
98 | { | |
d50dde5a | 99 | return policy == SCHED_FIFO || policy == SCHED_RR; |
029632fb PZ |
100 | } |
101 | ||
aab03e05 DF |
102 | static inline int dl_policy(int policy) |
103 | { | |
104 | return policy == SCHED_DEADLINE; | |
105 | } | |
20f9cd2a HA |
106 | static inline bool valid_policy(int policy) |
107 | { | |
108 | return idle_policy(policy) || fair_policy(policy) || | |
109 | rt_policy(policy) || dl_policy(policy); | |
110 | } | |
aab03e05 | 111 | |
029632fb PZ |
112 | static inline int task_has_rt_policy(struct task_struct *p) |
113 | { | |
114 | return rt_policy(p->policy); | |
115 | } | |
116 | ||
aab03e05 DF |
117 | static inline int task_has_dl_policy(struct task_struct *p) |
118 | { | |
119 | return dl_policy(p->policy); | |
120 | } | |
121 | ||
2d3d891d DF |
122 | /* |
123 | * Tells if entity @a should preempt entity @b. | |
124 | */ | |
332ac17e DF |
125 | static inline bool |
126 | dl_entity_preempt(struct sched_dl_entity *a, struct sched_dl_entity *b) | |
2d3d891d DF |
127 | { |
128 | return dl_time_before(a->deadline, b->deadline); | |
129 | } | |
130 | ||
029632fb PZ |
131 | /* |
132 | * This is the priority-queue data structure of the RT scheduling class: | |
133 | */ | |
134 | struct rt_prio_array { | |
135 | DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */ | |
136 | struct list_head queue[MAX_RT_PRIO]; | |
137 | }; | |
138 | ||
139 | struct rt_bandwidth { | |
140 | /* nests inside the rq lock: */ | |
141 | raw_spinlock_t rt_runtime_lock; | |
142 | ktime_t rt_period; | |
143 | u64 rt_runtime; | |
144 | struct hrtimer rt_period_timer; | |
4cfafd30 | 145 | unsigned int rt_period_active; |
029632fb | 146 | }; |
a5e7be3b JL |
147 | |
148 | void __dl_clear_params(struct task_struct *p); | |
149 | ||
332ac17e DF |
150 | /* |
151 | * To keep the bandwidth of -deadline tasks and groups under control | |
152 | * we need some place where: | |
153 | * - store the maximum -deadline bandwidth of the system (the group); | |
154 | * - cache the fraction of that bandwidth that is currently allocated. | |
155 | * | |
156 | * This is all done in the data structure below. It is similar to the | |
157 | * one used for RT-throttling (rt_bandwidth), with the main difference | |
158 | * that, since here we are only interested in admission control, we | |
159 | * do not decrease any runtime while the group "executes", neither we | |
160 | * need a timer to replenish it. | |
161 | * | |
162 | * With respect to SMP, the bandwidth is given on a per-CPU basis, | |
163 | * meaning that: | |
164 | * - dl_bw (< 100%) is the bandwidth of the system (group) on each CPU; | |
165 | * - dl_total_bw array contains, in the i-eth element, the currently | |
166 | * allocated bandwidth on the i-eth CPU. | |
167 | * Moreover, groups consume bandwidth on each CPU, while tasks only | |
168 | * consume bandwidth on the CPU they're running on. | |
169 | * Finally, dl_total_bw_cpu is used to cache the index of dl_total_bw | |
170 | * that will be shown the next time the proc or cgroup controls will | |
171 | * be red. It on its turn can be changed by writing on its own | |
172 | * control. | |
173 | */ | |
174 | struct dl_bandwidth { | |
175 | raw_spinlock_t dl_runtime_lock; | |
176 | u64 dl_runtime; | |
177 | u64 dl_period; | |
178 | }; | |
179 | ||
180 | static inline int dl_bandwidth_enabled(void) | |
181 | { | |
1724813d | 182 | return sysctl_sched_rt_runtime >= 0; |
332ac17e DF |
183 | } |
184 | ||
185 | extern struct dl_bw *dl_bw_of(int i); | |
186 | ||
187 | struct dl_bw { | |
188 | raw_spinlock_t lock; | |
189 | u64 bw, total_bw; | |
190 | }; | |
191 | ||
7f51412a JL |
192 | static inline |
193 | void __dl_clear(struct dl_bw *dl_b, u64 tsk_bw) | |
194 | { | |
195 | dl_b->total_bw -= tsk_bw; | |
196 | } | |
197 | ||
198 | static inline | |
199 | void __dl_add(struct dl_bw *dl_b, u64 tsk_bw) | |
200 | { | |
201 | dl_b->total_bw += tsk_bw; | |
202 | } | |
203 | ||
204 | static inline | |
205 | bool __dl_overflow(struct dl_bw *dl_b, int cpus, u64 old_bw, u64 new_bw) | |
206 | { | |
207 | return dl_b->bw != -1 && | |
208 | dl_b->bw * cpus < dl_b->total_bw - old_bw + new_bw; | |
209 | } | |
210 | ||
029632fb PZ |
211 | extern struct mutex sched_domains_mutex; |
212 | ||
213 | #ifdef CONFIG_CGROUP_SCHED | |
214 | ||
215 | #include <linux/cgroup.h> | |
216 | ||
217 | struct cfs_rq; | |
218 | struct rt_rq; | |
219 | ||
35cf4e50 | 220 | extern struct list_head task_groups; |
029632fb PZ |
221 | |
222 | struct cfs_bandwidth { | |
223 | #ifdef CONFIG_CFS_BANDWIDTH | |
224 | raw_spinlock_t lock; | |
225 | ktime_t period; | |
226 | u64 quota, runtime; | |
9c58c79a | 227 | s64 hierarchical_quota; |
029632fb PZ |
228 | u64 runtime_expires; |
229 | ||
4cfafd30 | 230 | int idle, period_active; |
029632fb PZ |
231 | struct hrtimer period_timer, slack_timer; |
232 | struct list_head throttled_cfs_rq; | |
233 | ||
234 | /* statistics */ | |
235 | int nr_periods, nr_throttled; | |
236 | u64 throttled_time; | |
237 | #endif | |
238 | }; | |
239 | ||
240 | /* task group related information */ | |
241 | struct task_group { | |
242 | struct cgroup_subsys_state css; | |
243 | ||
244 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
245 | /* schedulable entities of this group on each cpu */ | |
246 | struct sched_entity **se; | |
247 | /* runqueue "owned" by this group on each cpu */ | |
248 | struct cfs_rq **cfs_rq; | |
249 | unsigned long shares; | |
250 | ||
fa6bddeb | 251 | #ifdef CONFIG_SMP |
b0367629 WL |
252 | /* |
253 | * load_avg can be heavily contended at clock tick time, so put | |
254 | * it in its own cacheline separated from the fields above which | |
255 | * will also be accessed at each tick. | |
256 | */ | |
257 | atomic_long_t load_avg ____cacheline_aligned; | |
029632fb | 258 | #endif |
fa6bddeb | 259 | #endif |
029632fb PZ |
260 | |
261 | #ifdef CONFIG_RT_GROUP_SCHED | |
262 | struct sched_rt_entity **rt_se; | |
263 | struct rt_rq **rt_rq; | |
264 | ||
265 | struct rt_bandwidth rt_bandwidth; | |
266 | #endif | |
267 | ||
268 | struct rcu_head rcu; | |
269 | struct list_head list; | |
270 | ||
271 | struct task_group *parent; | |
272 | struct list_head siblings; | |
273 | struct list_head children; | |
274 | ||
275 | #ifdef CONFIG_SCHED_AUTOGROUP | |
276 | struct autogroup *autogroup; | |
277 | #endif | |
278 | ||
279 | struct cfs_bandwidth cfs_bandwidth; | |
280 | }; | |
281 | ||
282 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
283 | #define ROOT_TASK_GROUP_LOAD NICE_0_LOAD | |
284 | ||
285 | /* | |
286 | * A weight of 0 or 1 can cause arithmetics problems. | |
287 | * A weight of a cfs_rq is the sum of weights of which entities | |
288 | * are queued on this cfs_rq, so a weight of a entity should not be | |
289 | * too large, so as the shares value of a task group. | |
290 | * (The default weight is 1024 - so there's no practical | |
291 | * limitation from this.) | |
292 | */ | |
293 | #define MIN_SHARES (1UL << 1) | |
294 | #define MAX_SHARES (1UL << 18) | |
295 | #endif | |
296 | ||
029632fb PZ |
297 | typedef int (*tg_visitor)(struct task_group *, void *); |
298 | ||
299 | extern int walk_tg_tree_from(struct task_group *from, | |
300 | tg_visitor down, tg_visitor up, void *data); | |
301 | ||
302 | /* | |
303 | * Iterate the full tree, calling @down when first entering a node and @up when | |
304 | * leaving it for the final time. | |
305 | * | |
306 | * Caller must hold rcu_lock or sufficient equivalent. | |
307 | */ | |
308 | static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data) | |
309 | { | |
310 | return walk_tg_tree_from(&root_task_group, down, up, data); | |
311 | } | |
312 | ||
313 | extern int tg_nop(struct task_group *tg, void *data); | |
314 | ||
315 | extern void free_fair_sched_group(struct task_group *tg); | |
316 | extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent); | |
6fe1f348 | 317 | extern void unregister_fair_sched_group(struct task_group *tg); |
029632fb PZ |
318 | extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq, |
319 | struct sched_entity *se, int cpu, | |
320 | struct sched_entity *parent); | |
321 | extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b); | |
029632fb PZ |
322 | |
323 | extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b); | |
77a4d1a1 | 324 | extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b); |
029632fb PZ |
325 | extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq); |
326 | ||
327 | extern void free_rt_sched_group(struct task_group *tg); | |
328 | extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent); | |
329 | extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq, | |
330 | struct sched_rt_entity *rt_se, int cpu, | |
331 | struct sched_rt_entity *parent); | |
332 | ||
25cc7da7 LZ |
333 | extern struct task_group *sched_create_group(struct task_group *parent); |
334 | extern void sched_online_group(struct task_group *tg, | |
335 | struct task_group *parent); | |
336 | extern void sched_destroy_group(struct task_group *tg); | |
337 | extern void sched_offline_group(struct task_group *tg); | |
338 | ||
339 | extern void sched_move_task(struct task_struct *tsk); | |
340 | ||
341 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
342 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); | |
ad936d86 BP |
343 | |
344 | #ifdef CONFIG_SMP | |
345 | extern void set_task_rq_fair(struct sched_entity *se, | |
346 | struct cfs_rq *prev, struct cfs_rq *next); | |
347 | #else /* !CONFIG_SMP */ | |
348 | static inline void set_task_rq_fair(struct sched_entity *se, | |
349 | struct cfs_rq *prev, struct cfs_rq *next) { } | |
350 | #endif /* CONFIG_SMP */ | |
351 | #endif /* CONFIG_FAIR_GROUP_SCHED */ | |
25cc7da7 | 352 | |
029632fb PZ |
353 | #else /* CONFIG_CGROUP_SCHED */ |
354 | ||
355 | struct cfs_bandwidth { }; | |
356 | ||
357 | #endif /* CONFIG_CGROUP_SCHED */ | |
358 | ||
359 | /* CFS-related fields in a runqueue */ | |
360 | struct cfs_rq { | |
361 | struct load_weight load; | |
c82513e5 | 362 | unsigned int nr_running, h_nr_running; |
029632fb PZ |
363 | |
364 | u64 exec_clock; | |
365 | u64 min_vruntime; | |
366 | #ifndef CONFIG_64BIT | |
367 | u64 min_vruntime_copy; | |
368 | #endif | |
369 | ||
370 | struct rb_root tasks_timeline; | |
371 | struct rb_node *rb_leftmost; | |
372 | ||
029632fb PZ |
373 | /* |
374 | * 'curr' points to currently running entity on this cfs_rq. | |
375 | * It is set to NULL otherwise (i.e when none are currently running). | |
376 | */ | |
377 | struct sched_entity *curr, *next, *last, *skip; | |
378 | ||
379 | #ifdef CONFIG_SCHED_DEBUG | |
380 | unsigned int nr_spread_over; | |
381 | #endif | |
382 | ||
2dac754e PT |
383 | #ifdef CONFIG_SMP |
384 | /* | |
9d89c257 | 385 | * CFS load tracking |
2dac754e | 386 | */ |
9d89c257 | 387 | struct sched_avg avg; |
13962234 YD |
388 | u64 runnable_load_sum; |
389 | unsigned long runnable_load_avg; | |
c566e8e9 | 390 | #ifdef CONFIG_FAIR_GROUP_SCHED |
9d89c257 YD |
391 | unsigned long tg_load_avg_contrib; |
392 | #endif | |
393 | atomic_long_t removed_load_avg, removed_util_avg; | |
394 | #ifndef CONFIG_64BIT | |
395 | u64 load_last_update_time_copy; | |
396 | #endif | |
82958366 | 397 | |
9d89c257 | 398 | #ifdef CONFIG_FAIR_GROUP_SCHED |
82958366 PT |
399 | /* |
400 | * h_load = weight * f(tg) | |
401 | * | |
402 | * Where f(tg) is the recursive weight fraction assigned to | |
403 | * this group. | |
404 | */ | |
405 | unsigned long h_load; | |
68520796 VD |
406 | u64 last_h_load_update; |
407 | struct sched_entity *h_load_next; | |
408 | #endif /* CONFIG_FAIR_GROUP_SCHED */ | |
82958366 PT |
409 | #endif /* CONFIG_SMP */ |
410 | ||
029632fb PZ |
411 | #ifdef CONFIG_FAIR_GROUP_SCHED |
412 | struct rq *rq; /* cpu runqueue to which this cfs_rq is attached */ | |
413 | ||
414 | /* | |
415 | * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in | |
416 | * a hierarchy). Non-leaf lrqs hold other higher schedulable entities | |
417 | * (like users, containers etc.) | |
418 | * | |
419 | * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a cpu. This | |
420 | * list is used during load balance. | |
421 | */ | |
422 | int on_list; | |
423 | struct list_head leaf_cfs_rq_list; | |
424 | struct task_group *tg; /* group that "owns" this runqueue */ | |
425 | ||
029632fb PZ |
426 | #ifdef CONFIG_CFS_BANDWIDTH |
427 | int runtime_enabled; | |
428 | u64 runtime_expires; | |
429 | s64 runtime_remaining; | |
430 | ||
f1b17280 PT |
431 | u64 throttled_clock, throttled_clock_task; |
432 | u64 throttled_clock_task_time; | |
029632fb PZ |
433 | int throttled, throttle_count; |
434 | struct list_head throttled_list; | |
435 | #endif /* CONFIG_CFS_BANDWIDTH */ | |
436 | #endif /* CONFIG_FAIR_GROUP_SCHED */ | |
437 | }; | |
438 | ||
439 | static inline int rt_bandwidth_enabled(void) | |
440 | { | |
441 | return sysctl_sched_rt_runtime >= 0; | |
442 | } | |
443 | ||
b6366f04 SR |
444 | /* RT IPI pull logic requires IRQ_WORK */ |
445 | #ifdef CONFIG_IRQ_WORK | |
446 | # define HAVE_RT_PUSH_IPI | |
447 | #endif | |
448 | ||
029632fb PZ |
449 | /* Real-Time classes' related field in a runqueue: */ |
450 | struct rt_rq { | |
451 | struct rt_prio_array active; | |
c82513e5 | 452 | unsigned int rt_nr_running; |
01d36d0a | 453 | unsigned int rr_nr_running; |
029632fb PZ |
454 | #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED |
455 | struct { | |
456 | int curr; /* highest queued rt task prio */ | |
457 | #ifdef CONFIG_SMP | |
458 | int next; /* next highest */ | |
459 | #endif | |
460 | } highest_prio; | |
461 | #endif | |
462 | #ifdef CONFIG_SMP | |
463 | unsigned long rt_nr_migratory; | |
464 | unsigned long rt_nr_total; | |
465 | int overloaded; | |
466 | struct plist_head pushable_tasks; | |
b6366f04 SR |
467 | #ifdef HAVE_RT_PUSH_IPI |
468 | int push_flags; | |
469 | int push_cpu; | |
470 | struct irq_work push_work; | |
471 | raw_spinlock_t push_lock; | |
029632fb | 472 | #endif |
b6366f04 | 473 | #endif /* CONFIG_SMP */ |
f4ebcbc0 KT |
474 | int rt_queued; |
475 | ||
029632fb PZ |
476 | int rt_throttled; |
477 | u64 rt_time; | |
478 | u64 rt_runtime; | |
479 | /* Nests inside the rq lock: */ | |
480 | raw_spinlock_t rt_runtime_lock; | |
481 | ||
482 | #ifdef CONFIG_RT_GROUP_SCHED | |
483 | unsigned long rt_nr_boosted; | |
484 | ||
485 | struct rq *rq; | |
029632fb PZ |
486 | struct task_group *tg; |
487 | #endif | |
488 | }; | |
489 | ||
aab03e05 DF |
490 | /* Deadline class' related fields in a runqueue */ |
491 | struct dl_rq { | |
492 | /* runqueue is an rbtree, ordered by deadline */ | |
493 | struct rb_root rb_root; | |
494 | struct rb_node *rb_leftmost; | |
495 | ||
496 | unsigned long dl_nr_running; | |
1baca4ce JL |
497 | |
498 | #ifdef CONFIG_SMP | |
499 | /* | |
500 | * Deadline values of the currently executing and the | |
501 | * earliest ready task on this rq. Caching these facilitates | |
502 | * the decision wether or not a ready but not running task | |
503 | * should migrate somewhere else. | |
504 | */ | |
505 | struct { | |
506 | u64 curr; | |
507 | u64 next; | |
508 | } earliest_dl; | |
509 | ||
510 | unsigned long dl_nr_migratory; | |
1baca4ce JL |
511 | int overloaded; |
512 | ||
513 | /* | |
514 | * Tasks on this rq that can be pushed away. They are kept in | |
515 | * an rb-tree, ordered by tasks' deadlines, with caching | |
516 | * of the leftmost (earliest deadline) element. | |
517 | */ | |
518 | struct rb_root pushable_dl_tasks_root; | |
519 | struct rb_node *pushable_dl_tasks_leftmost; | |
332ac17e DF |
520 | #else |
521 | struct dl_bw dl_bw; | |
1baca4ce | 522 | #endif |
aab03e05 DF |
523 | }; |
524 | ||
029632fb PZ |
525 | #ifdef CONFIG_SMP |
526 | ||
527 | /* | |
528 | * We add the notion of a root-domain which will be used to define per-domain | |
529 | * variables. Each exclusive cpuset essentially defines an island domain by | |
530 | * fully partitioning the member cpus from any other cpuset. Whenever a new | |
531 | * exclusive cpuset is created, we also create and attach a new root-domain | |
532 | * object. | |
533 | * | |
534 | */ | |
535 | struct root_domain { | |
536 | atomic_t refcount; | |
537 | atomic_t rto_count; | |
538 | struct rcu_head rcu; | |
539 | cpumask_var_t span; | |
540 | cpumask_var_t online; | |
541 | ||
4486edd1 TC |
542 | /* Indicate more than one runnable task for any CPU */ |
543 | bool overload; | |
544 | ||
1baca4ce JL |
545 | /* |
546 | * The bit corresponding to a CPU gets set here if such CPU has more | |
547 | * than one runnable -deadline task (as it is below for RT tasks). | |
548 | */ | |
549 | cpumask_var_t dlo_mask; | |
550 | atomic_t dlo_count; | |
332ac17e | 551 | struct dl_bw dl_bw; |
6bfd6d72 | 552 | struct cpudl cpudl; |
1baca4ce | 553 | |
029632fb PZ |
554 | /* |
555 | * The "RT overload" flag: it gets set if a CPU has more than | |
556 | * one runnable RT task. | |
557 | */ | |
558 | cpumask_var_t rto_mask; | |
559 | struct cpupri cpupri; | |
560 | }; | |
561 | ||
562 | extern struct root_domain def_root_domain; | |
563 | ||
564 | #endif /* CONFIG_SMP */ | |
565 | ||
566 | /* | |
567 | * This is the main, per-CPU runqueue data structure. | |
568 | * | |
569 | * Locking rule: those places that want to lock multiple runqueues | |
570 | * (such as the load balancing or the thread migration code), lock | |
571 | * acquire operations must be ordered by ascending &runqueue. | |
572 | */ | |
573 | struct rq { | |
574 | /* runqueue lock: */ | |
575 | raw_spinlock_t lock; | |
576 | ||
577 | /* | |
578 | * nr_running and cpu_load should be in the same cacheline because | |
579 | * remote CPUs use both these fields when doing load calculation. | |
580 | */ | |
c82513e5 | 581 | unsigned int nr_running; |
0ec8aa00 PZ |
582 | #ifdef CONFIG_NUMA_BALANCING |
583 | unsigned int nr_numa_running; | |
584 | unsigned int nr_preferred_running; | |
585 | #endif | |
029632fb PZ |
586 | #define CPU_LOAD_IDX_MAX 5 |
587 | unsigned long cpu_load[CPU_LOAD_IDX_MAX]; | |
588 | unsigned long last_load_update_tick; | |
3451d024 | 589 | #ifdef CONFIG_NO_HZ_COMMON |
029632fb | 590 | u64 nohz_stamp; |
1c792db7 | 591 | unsigned long nohz_flags; |
265f22a9 FW |
592 | #endif |
593 | #ifdef CONFIG_NO_HZ_FULL | |
594 | unsigned long last_sched_tick; | |
029632fb | 595 | #endif |
029632fb PZ |
596 | /* capture load from *all* tasks on this cpu: */ |
597 | struct load_weight load; | |
598 | unsigned long nr_load_updates; | |
599 | u64 nr_switches; | |
600 | ||
601 | struct cfs_rq cfs; | |
602 | struct rt_rq rt; | |
aab03e05 | 603 | struct dl_rq dl; |
029632fb PZ |
604 | |
605 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
606 | /* list of leaf cfs_rq on this cpu: */ | |
607 | struct list_head leaf_cfs_rq_list; | |
a35b6466 PZ |
608 | #endif /* CONFIG_FAIR_GROUP_SCHED */ |
609 | ||
029632fb PZ |
610 | /* |
611 | * This is part of a global counter where only the total sum | |
612 | * over all CPUs matters. A task can increase this counter on | |
613 | * one CPU and if it got migrated afterwards it may decrease | |
614 | * it on another CPU. Always updated under the runqueue lock: | |
615 | */ | |
616 | unsigned long nr_uninterruptible; | |
617 | ||
618 | struct task_struct *curr, *idle, *stop; | |
619 | unsigned long next_balance; | |
620 | struct mm_struct *prev_mm; | |
621 | ||
9edfbfed | 622 | unsigned int clock_skip_update; |
029632fb PZ |
623 | u64 clock; |
624 | u64 clock_task; | |
625 | ||
626 | atomic_t nr_iowait; | |
627 | ||
628 | #ifdef CONFIG_SMP | |
629 | struct root_domain *rd; | |
630 | struct sched_domain *sd; | |
631 | ||
ced549fa | 632 | unsigned long cpu_capacity; |
ca6d75e6 | 633 | unsigned long cpu_capacity_orig; |
029632fb | 634 | |
e3fca9e7 PZ |
635 | struct callback_head *balance_callback; |
636 | ||
029632fb PZ |
637 | unsigned char idle_balance; |
638 | /* For active balancing */ | |
029632fb PZ |
639 | int active_balance; |
640 | int push_cpu; | |
641 | struct cpu_stop_work active_balance_work; | |
642 | /* cpu of this runqueue: */ | |
643 | int cpu; | |
644 | int online; | |
645 | ||
367456c7 PZ |
646 | struct list_head cfs_tasks; |
647 | ||
029632fb PZ |
648 | u64 rt_avg; |
649 | u64 age_stamp; | |
650 | u64 idle_stamp; | |
651 | u64 avg_idle; | |
9bd721c5 JL |
652 | |
653 | /* This is used to determine avg_idle's max value */ | |
654 | u64 max_idle_balance_cost; | |
029632fb PZ |
655 | #endif |
656 | ||
657 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING | |
658 | u64 prev_irq_time; | |
659 | #endif | |
660 | #ifdef CONFIG_PARAVIRT | |
661 | u64 prev_steal_time; | |
662 | #endif | |
663 | #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING | |
664 | u64 prev_steal_time_rq; | |
665 | #endif | |
666 | ||
667 | /* calc_load related fields */ | |
668 | unsigned long calc_load_update; | |
669 | long calc_load_active; | |
670 | ||
671 | #ifdef CONFIG_SCHED_HRTICK | |
672 | #ifdef CONFIG_SMP | |
673 | int hrtick_csd_pending; | |
674 | struct call_single_data hrtick_csd; | |
675 | #endif | |
676 | struct hrtimer hrtick_timer; | |
677 | #endif | |
678 | ||
679 | #ifdef CONFIG_SCHEDSTATS | |
680 | /* latency stats */ | |
681 | struct sched_info rq_sched_info; | |
682 | unsigned long long rq_cpu_time; | |
683 | /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */ | |
684 | ||
685 | /* sys_sched_yield() stats */ | |
686 | unsigned int yld_count; | |
687 | ||
688 | /* schedule() stats */ | |
029632fb PZ |
689 | unsigned int sched_count; |
690 | unsigned int sched_goidle; | |
691 | ||
692 | /* try_to_wake_up() stats */ | |
693 | unsigned int ttwu_count; | |
694 | unsigned int ttwu_local; | |
695 | #endif | |
696 | ||
697 | #ifdef CONFIG_SMP | |
698 | struct llist_head wake_list; | |
699 | #endif | |
442bf3aa DL |
700 | |
701 | #ifdef CONFIG_CPU_IDLE | |
702 | /* Must be inspected within a rcu lock section */ | |
703 | struct cpuidle_state *idle_state; | |
704 | #endif | |
029632fb PZ |
705 | }; |
706 | ||
707 | static inline int cpu_of(struct rq *rq) | |
708 | { | |
709 | #ifdef CONFIG_SMP | |
710 | return rq->cpu; | |
711 | #else | |
712 | return 0; | |
713 | #endif | |
714 | } | |
715 | ||
8b06c55b | 716 | DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); |
029632fb | 717 | |
518cd623 | 718 | #define cpu_rq(cpu) (&per_cpu(runqueues, (cpu))) |
4a32fea9 | 719 | #define this_rq() this_cpu_ptr(&runqueues) |
518cd623 PZ |
720 | #define task_rq(p) cpu_rq(task_cpu(p)) |
721 | #define cpu_curr(cpu) (cpu_rq(cpu)->curr) | |
4a32fea9 | 722 | #define raw_rq() raw_cpu_ptr(&runqueues) |
518cd623 | 723 | |
cebde6d6 PZ |
724 | static inline u64 __rq_clock_broken(struct rq *rq) |
725 | { | |
316c1608 | 726 | return READ_ONCE(rq->clock); |
cebde6d6 PZ |
727 | } |
728 | ||
78becc27 FW |
729 | static inline u64 rq_clock(struct rq *rq) |
730 | { | |
cebde6d6 | 731 | lockdep_assert_held(&rq->lock); |
78becc27 FW |
732 | return rq->clock; |
733 | } | |
734 | ||
735 | static inline u64 rq_clock_task(struct rq *rq) | |
736 | { | |
cebde6d6 | 737 | lockdep_assert_held(&rq->lock); |
78becc27 FW |
738 | return rq->clock_task; |
739 | } | |
740 | ||
9edfbfed PZ |
741 | #define RQCF_REQ_SKIP 0x01 |
742 | #define RQCF_ACT_SKIP 0x02 | |
743 | ||
744 | static inline void rq_clock_skip_update(struct rq *rq, bool skip) | |
745 | { | |
746 | lockdep_assert_held(&rq->lock); | |
747 | if (skip) | |
748 | rq->clock_skip_update |= RQCF_REQ_SKIP; | |
749 | else | |
750 | rq->clock_skip_update &= ~RQCF_REQ_SKIP; | |
751 | } | |
752 | ||
9942f79b | 753 | #ifdef CONFIG_NUMA |
e3fe70b1 RR |
754 | enum numa_topology_type { |
755 | NUMA_DIRECT, | |
756 | NUMA_GLUELESS_MESH, | |
757 | NUMA_BACKPLANE, | |
758 | }; | |
759 | extern enum numa_topology_type sched_numa_topology_type; | |
9942f79b RR |
760 | extern int sched_max_numa_distance; |
761 | extern bool find_numa_distance(int distance); | |
762 | #endif | |
763 | ||
f809ca9a | 764 | #ifdef CONFIG_NUMA_BALANCING |
44dba3d5 IM |
765 | /* The regions in numa_faults array from task_struct */ |
766 | enum numa_faults_stats { | |
767 | NUMA_MEM = 0, | |
768 | NUMA_CPU, | |
769 | NUMA_MEMBUF, | |
770 | NUMA_CPUBUF | |
771 | }; | |
0ec8aa00 | 772 | extern void sched_setnuma(struct task_struct *p, int node); |
e6628d5b | 773 | extern int migrate_task_to(struct task_struct *p, int cpu); |
ac66f547 | 774 | extern int migrate_swap(struct task_struct *, struct task_struct *); |
f809ca9a MG |
775 | #endif /* CONFIG_NUMA_BALANCING */ |
776 | ||
518cd623 PZ |
777 | #ifdef CONFIG_SMP |
778 | ||
e3fca9e7 PZ |
779 | static inline void |
780 | queue_balance_callback(struct rq *rq, | |
781 | struct callback_head *head, | |
782 | void (*func)(struct rq *rq)) | |
783 | { | |
784 | lockdep_assert_held(&rq->lock); | |
785 | ||
786 | if (unlikely(head->next)) | |
787 | return; | |
788 | ||
789 | head->func = (void (*)(struct callback_head *))func; | |
790 | head->next = rq->balance_callback; | |
791 | rq->balance_callback = head; | |
792 | } | |
793 | ||
e3baac47 PZ |
794 | extern void sched_ttwu_pending(void); |
795 | ||
029632fb PZ |
796 | #define rcu_dereference_check_sched_domain(p) \ |
797 | rcu_dereference_check((p), \ | |
798 | lockdep_is_held(&sched_domains_mutex)) | |
799 | ||
800 | /* | |
801 | * The domain tree (rq->sd) is protected by RCU's quiescent state transition. | |
802 | * See detach_destroy_domains: synchronize_sched for details. | |
803 | * | |
804 | * The domain tree of any CPU may only be accessed from within | |
805 | * preempt-disabled sections. | |
806 | */ | |
807 | #define for_each_domain(cpu, __sd) \ | |
518cd623 PZ |
808 | for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \ |
809 | __sd; __sd = __sd->parent) | |
029632fb | 810 | |
77e81365 SS |
811 | #define for_each_lower_domain(sd) for (; sd; sd = sd->child) |
812 | ||
518cd623 PZ |
813 | /** |
814 | * highest_flag_domain - Return highest sched_domain containing flag. | |
815 | * @cpu: The cpu whose highest level of sched domain is to | |
816 | * be returned. | |
817 | * @flag: The flag to check for the highest sched_domain | |
818 | * for the given cpu. | |
819 | * | |
820 | * Returns the highest sched_domain of a cpu which contains the given flag. | |
821 | */ | |
822 | static inline struct sched_domain *highest_flag_domain(int cpu, int flag) | |
823 | { | |
824 | struct sched_domain *sd, *hsd = NULL; | |
825 | ||
826 | for_each_domain(cpu, sd) { | |
827 | if (!(sd->flags & flag)) | |
828 | break; | |
829 | hsd = sd; | |
830 | } | |
831 | ||
832 | return hsd; | |
833 | } | |
834 | ||
fb13c7ee MG |
835 | static inline struct sched_domain *lowest_flag_domain(int cpu, int flag) |
836 | { | |
837 | struct sched_domain *sd; | |
838 | ||
839 | for_each_domain(cpu, sd) { | |
840 | if (sd->flags & flag) | |
841 | break; | |
842 | } | |
843 | ||
844 | return sd; | |
845 | } | |
846 | ||
518cd623 | 847 | DECLARE_PER_CPU(struct sched_domain *, sd_llc); |
7d9ffa89 | 848 | DECLARE_PER_CPU(int, sd_llc_size); |
518cd623 | 849 | DECLARE_PER_CPU(int, sd_llc_id); |
fb13c7ee | 850 | DECLARE_PER_CPU(struct sched_domain *, sd_numa); |
37dc6b50 PM |
851 | DECLARE_PER_CPU(struct sched_domain *, sd_busy); |
852 | DECLARE_PER_CPU(struct sched_domain *, sd_asym); | |
518cd623 | 853 | |
63b2ca30 | 854 | struct sched_group_capacity { |
5e6521ea LZ |
855 | atomic_t ref; |
856 | /* | |
63b2ca30 NP |
857 | * CPU capacity of this group, SCHED_LOAD_SCALE being max capacity |
858 | * for a single CPU. | |
5e6521ea | 859 | */ |
dc7ff76e | 860 | unsigned int capacity; |
5e6521ea | 861 | unsigned long next_update; |
63b2ca30 | 862 | int imbalance; /* XXX unrelated to capacity but shared group state */ |
5e6521ea LZ |
863 | /* |
864 | * Number of busy cpus in this group. | |
865 | */ | |
866 | atomic_t nr_busy_cpus; | |
867 | ||
868 | unsigned long cpumask[0]; /* iteration mask */ | |
869 | }; | |
870 | ||
871 | struct sched_group { | |
872 | struct sched_group *next; /* Must be a circular list */ | |
873 | atomic_t ref; | |
874 | ||
875 | unsigned int group_weight; | |
63b2ca30 | 876 | struct sched_group_capacity *sgc; |
5e6521ea LZ |
877 | |
878 | /* | |
879 | * The CPUs this group covers. | |
880 | * | |
881 | * NOTE: this field is variable length. (Allocated dynamically | |
882 | * by attaching extra space to the end of the structure, | |
883 | * depending on how many CPUs the kernel has booted up with) | |
884 | */ | |
885 | unsigned long cpumask[0]; | |
886 | }; | |
887 | ||
888 | static inline struct cpumask *sched_group_cpus(struct sched_group *sg) | |
889 | { | |
890 | return to_cpumask(sg->cpumask); | |
891 | } | |
892 | ||
893 | /* | |
894 | * cpumask masking which cpus in the group are allowed to iterate up the domain | |
895 | * tree. | |
896 | */ | |
897 | static inline struct cpumask *sched_group_mask(struct sched_group *sg) | |
898 | { | |
63b2ca30 | 899 | return to_cpumask(sg->sgc->cpumask); |
5e6521ea LZ |
900 | } |
901 | ||
902 | /** | |
903 | * group_first_cpu - Returns the first cpu in the cpumask of a sched_group. | |
904 | * @group: The group whose first cpu is to be returned. | |
905 | */ | |
906 | static inline unsigned int group_first_cpu(struct sched_group *group) | |
907 | { | |
908 | return cpumask_first(sched_group_cpus(group)); | |
909 | } | |
910 | ||
c1174876 PZ |
911 | extern int group_balance_cpu(struct sched_group *sg); |
912 | ||
3866e845 SRRH |
913 | #if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL) |
914 | void register_sched_domain_sysctl(void); | |
915 | void unregister_sched_domain_sysctl(void); | |
916 | #else | |
917 | static inline void register_sched_domain_sysctl(void) | |
918 | { | |
919 | } | |
920 | static inline void unregister_sched_domain_sysctl(void) | |
921 | { | |
922 | } | |
923 | #endif | |
924 | ||
e3baac47 PZ |
925 | #else |
926 | ||
927 | static inline void sched_ttwu_pending(void) { } | |
928 | ||
518cd623 | 929 | #endif /* CONFIG_SMP */ |
029632fb | 930 | |
391e43da PZ |
931 | #include "stats.h" |
932 | #include "auto_group.h" | |
029632fb PZ |
933 | |
934 | #ifdef CONFIG_CGROUP_SCHED | |
935 | ||
936 | /* | |
937 | * Return the group to which this tasks belongs. | |
938 | * | |
8af01f56 TH |
939 | * We cannot use task_css() and friends because the cgroup subsystem |
940 | * changes that value before the cgroup_subsys::attach() method is called, | |
941 | * therefore we cannot pin it and might observe the wrong value. | |
8323f26c PZ |
942 | * |
943 | * The same is true for autogroup's p->signal->autogroup->tg, the autogroup | |
944 | * core changes this before calling sched_move_task(). | |
945 | * | |
946 | * Instead we use a 'copy' which is updated from sched_move_task() while | |
947 | * holding both task_struct::pi_lock and rq::lock. | |
029632fb PZ |
948 | */ |
949 | static inline struct task_group *task_group(struct task_struct *p) | |
950 | { | |
8323f26c | 951 | return p->sched_task_group; |
029632fb PZ |
952 | } |
953 | ||
954 | /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */ | |
955 | static inline void set_task_rq(struct task_struct *p, unsigned int cpu) | |
956 | { | |
957 | #if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED) | |
958 | struct task_group *tg = task_group(p); | |
959 | #endif | |
960 | ||
961 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
ad936d86 | 962 | set_task_rq_fair(&p->se, p->se.cfs_rq, tg->cfs_rq[cpu]); |
029632fb PZ |
963 | p->se.cfs_rq = tg->cfs_rq[cpu]; |
964 | p->se.parent = tg->se[cpu]; | |
965 | #endif | |
966 | ||
967 | #ifdef CONFIG_RT_GROUP_SCHED | |
968 | p->rt.rt_rq = tg->rt_rq[cpu]; | |
969 | p->rt.parent = tg->rt_se[cpu]; | |
970 | #endif | |
971 | } | |
972 | ||
973 | #else /* CONFIG_CGROUP_SCHED */ | |
974 | ||
975 | static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { } | |
976 | static inline struct task_group *task_group(struct task_struct *p) | |
977 | { | |
978 | return NULL; | |
979 | } | |
980 | ||
981 | #endif /* CONFIG_CGROUP_SCHED */ | |
982 | ||
983 | static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu) | |
984 | { | |
985 | set_task_rq(p, cpu); | |
986 | #ifdef CONFIG_SMP | |
987 | /* | |
988 | * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be | |
989 | * successfuly executed on another CPU. We must ensure that updates of | |
990 | * per-task data have been completed by this moment. | |
991 | */ | |
992 | smp_wmb(); | |
993 | task_thread_info(p)->cpu = cpu; | |
ac66f547 | 994 | p->wake_cpu = cpu; |
029632fb PZ |
995 | #endif |
996 | } | |
997 | ||
998 | /* | |
999 | * Tunables that become constants when CONFIG_SCHED_DEBUG is off: | |
1000 | */ | |
1001 | #ifdef CONFIG_SCHED_DEBUG | |
c5905afb | 1002 | # include <linux/static_key.h> |
029632fb PZ |
1003 | # define const_debug __read_mostly |
1004 | #else | |
1005 | # define const_debug const | |
1006 | #endif | |
1007 | ||
1008 | extern const_debug unsigned int sysctl_sched_features; | |
1009 | ||
1010 | #define SCHED_FEAT(name, enabled) \ | |
1011 | __SCHED_FEAT_##name , | |
1012 | ||
1013 | enum { | |
391e43da | 1014 | #include "features.h" |
f8b6d1cc | 1015 | __SCHED_FEAT_NR, |
029632fb PZ |
1016 | }; |
1017 | ||
1018 | #undef SCHED_FEAT | |
1019 | ||
f8b6d1cc | 1020 | #if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL) |
f8b6d1cc | 1021 | #define SCHED_FEAT(name, enabled) \ |
c5905afb | 1022 | static __always_inline bool static_branch_##name(struct static_key *key) \ |
f8b6d1cc | 1023 | { \ |
6e76ea8a | 1024 | return static_key_##enabled(key); \ |
f8b6d1cc PZ |
1025 | } |
1026 | ||
1027 | #include "features.h" | |
1028 | ||
1029 | #undef SCHED_FEAT | |
1030 | ||
c5905afb | 1031 | extern struct static_key sched_feat_keys[__SCHED_FEAT_NR]; |
f8b6d1cc PZ |
1032 | #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x])) |
1033 | #else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */ | |
029632fb | 1034 | #define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) |
f8b6d1cc | 1035 | #endif /* SCHED_DEBUG && HAVE_JUMP_LABEL */ |
029632fb | 1036 | |
2a595721 | 1037 | extern struct static_key_false sched_numa_balancing; |
cb251765 | 1038 | extern struct static_key_false sched_schedstats; |
cbee9f88 | 1039 | |
029632fb PZ |
1040 | static inline u64 global_rt_period(void) |
1041 | { | |
1042 | return (u64)sysctl_sched_rt_period * NSEC_PER_USEC; | |
1043 | } | |
1044 | ||
1045 | static inline u64 global_rt_runtime(void) | |
1046 | { | |
1047 | if (sysctl_sched_rt_runtime < 0) | |
1048 | return RUNTIME_INF; | |
1049 | ||
1050 | return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC; | |
1051 | } | |
1052 | ||
029632fb PZ |
1053 | static inline int task_current(struct rq *rq, struct task_struct *p) |
1054 | { | |
1055 | return rq->curr == p; | |
1056 | } | |
1057 | ||
1058 | static inline int task_running(struct rq *rq, struct task_struct *p) | |
1059 | { | |
1060 | #ifdef CONFIG_SMP | |
1061 | return p->on_cpu; | |
1062 | #else | |
1063 | return task_current(rq, p); | |
1064 | #endif | |
1065 | } | |
1066 | ||
da0c1e65 KT |
1067 | static inline int task_on_rq_queued(struct task_struct *p) |
1068 | { | |
1069 | return p->on_rq == TASK_ON_RQ_QUEUED; | |
1070 | } | |
029632fb | 1071 | |
cca26e80 KT |
1072 | static inline int task_on_rq_migrating(struct task_struct *p) |
1073 | { | |
1074 | return p->on_rq == TASK_ON_RQ_MIGRATING; | |
1075 | } | |
1076 | ||
029632fb PZ |
1077 | #ifndef prepare_arch_switch |
1078 | # define prepare_arch_switch(next) do { } while (0) | |
1079 | #endif | |
01f23e16 CM |
1080 | #ifndef finish_arch_post_lock_switch |
1081 | # define finish_arch_post_lock_switch() do { } while (0) | |
1082 | #endif | |
029632fb | 1083 | |
029632fb PZ |
1084 | static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next) |
1085 | { | |
1086 | #ifdef CONFIG_SMP | |
1087 | /* | |
1088 | * We can optimise this out completely for !SMP, because the | |
1089 | * SMP rebalancing from interrupt is the only thing that cares | |
1090 | * here. | |
1091 | */ | |
1092 | next->on_cpu = 1; | |
1093 | #endif | |
1094 | } | |
1095 | ||
1096 | static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) | |
1097 | { | |
1098 | #ifdef CONFIG_SMP | |
1099 | /* | |
1100 | * After ->on_cpu is cleared, the task can be moved to a different CPU. | |
1101 | * We must ensure this doesn't happen until the switch is completely | |
1102 | * finished. | |
95913d97 | 1103 | * |
b75a2253 PZ |
1104 | * In particular, the load of prev->state in finish_task_switch() must |
1105 | * happen before this. | |
1106 | * | |
b3e0b1b6 | 1107 | * Pairs with the smp_cond_acquire() in try_to_wake_up(). |
029632fb | 1108 | */ |
95913d97 | 1109 | smp_store_release(&prev->on_cpu, 0); |
029632fb PZ |
1110 | #endif |
1111 | #ifdef CONFIG_DEBUG_SPINLOCK | |
1112 | /* this is a valid case when another task releases the spinlock */ | |
1113 | rq->lock.owner = current; | |
1114 | #endif | |
1115 | /* | |
1116 | * If we are tracking spinlock dependencies then we have to | |
1117 | * fix up the runqueue lock - which gets 'carried over' from | |
1118 | * prev into current: | |
1119 | */ | |
1120 | spin_acquire(&rq->lock.dep_map, 0, 0, _THIS_IP_); | |
1121 | ||
1122 | raw_spin_unlock_irq(&rq->lock); | |
1123 | } | |
1124 | ||
b13095f0 LZ |
1125 | /* |
1126 | * wake flags | |
1127 | */ | |
1128 | #define WF_SYNC 0x01 /* waker goes to sleep after wakeup */ | |
1129 | #define WF_FORK 0x02 /* child wakeup after fork */ | |
1130 | #define WF_MIGRATED 0x4 /* internal use, task got migrated */ | |
1131 | ||
029632fb PZ |
1132 | /* |
1133 | * To aid in avoiding the subversion of "niceness" due to uneven distribution | |
1134 | * of tasks with abnormal "nice" values across CPUs the contribution that | |
1135 | * each task makes to its run queue's load is weighted according to its | |
1136 | * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a | |
1137 | * scaled version of the new time slice allocation that they receive on time | |
1138 | * slice expiry etc. | |
1139 | */ | |
1140 | ||
1141 | #define WEIGHT_IDLEPRIO 3 | |
1142 | #define WMULT_IDLEPRIO 1431655765 | |
1143 | ||
ed82b8a1 AK |
1144 | extern const int sched_prio_to_weight[40]; |
1145 | extern const u32 sched_prio_to_wmult[40]; | |
029632fb | 1146 | |
ff77e468 PZ |
1147 | /* |
1148 | * {de,en}queue flags: | |
1149 | * | |
1150 | * DEQUEUE_SLEEP - task is no longer runnable | |
1151 | * ENQUEUE_WAKEUP - task just became runnable | |
1152 | * | |
1153 | * SAVE/RESTORE - an otherwise spurious dequeue/enqueue, done to ensure tasks | |
1154 | * are in a known state which allows modification. Such pairs | |
1155 | * should preserve as much state as possible. | |
1156 | * | |
1157 | * MOVE - paired with SAVE/RESTORE, explicitly does not preserve the location | |
1158 | * in the runqueue. | |
1159 | * | |
1160 | * ENQUEUE_HEAD - place at front of runqueue (tail if not specified) | |
1161 | * ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline) | |
1162 | * ENQUEUE_WAKING - sched_class::task_waking was called | |
1163 | * | |
1164 | */ | |
1165 | ||
1166 | #define DEQUEUE_SLEEP 0x01 | |
1167 | #define DEQUEUE_SAVE 0x02 /* matches ENQUEUE_RESTORE */ | |
1168 | #define DEQUEUE_MOVE 0x04 /* matches ENQUEUE_MOVE */ | |
1169 | ||
1de64443 | 1170 | #define ENQUEUE_WAKEUP 0x01 |
ff77e468 PZ |
1171 | #define ENQUEUE_RESTORE 0x02 |
1172 | #define ENQUEUE_MOVE 0x04 | |
1173 | ||
1174 | #define ENQUEUE_HEAD 0x08 | |
1175 | #define ENQUEUE_REPLENISH 0x10 | |
c82ba9fa | 1176 | #ifdef CONFIG_SMP |
ff77e468 | 1177 | #define ENQUEUE_WAKING 0x20 |
c82ba9fa | 1178 | #else |
1de64443 | 1179 | #define ENQUEUE_WAKING 0x00 |
c82ba9fa | 1180 | #endif |
c82ba9fa | 1181 | |
37e117c0 PZ |
1182 | #define RETRY_TASK ((void *)-1UL) |
1183 | ||
c82ba9fa LZ |
1184 | struct sched_class { |
1185 | const struct sched_class *next; | |
1186 | ||
1187 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); | |
1188 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); | |
1189 | void (*yield_task) (struct rq *rq); | |
1190 | bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt); | |
1191 | ||
1192 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); | |
1193 | ||
606dba2e PZ |
1194 | /* |
1195 | * It is the responsibility of the pick_next_task() method that will | |
1196 | * return the next task to call put_prev_task() on the @prev task or | |
1197 | * something equivalent. | |
37e117c0 PZ |
1198 | * |
1199 | * May return RETRY_TASK when it finds a higher prio class has runnable | |
1200 | * tasks. | |
606dba2e PZ |
1201 | */ |
1202 | struct task_struct * (*pick_next_task) (struct rq *rq, | |
1203 | struct task_struct *prev); | |
c82ba9fa LZ |
1204 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
1205 | ||
1206 | #ifdef CONFIG_SMP | |
ac66f547 | 1207 | int (*select_task_rq)(struct task_struct *p, int task_cpu, int sd_flag, int flags); |
5a4fd036 | 1208 | void (*migrate_task_rq)(struct task_struct *p); |
c82ba9fa | 1209 | |
c82ba9fa LZ |
1210 | void (*task_waking) (struct task_struct *task); |
1211 | void (*task_woken) (struct rq *this_rq, struct task_struct *task); | |
1212 | ||
1213 | void (*set_cpus_allowed)(struct task_struct *p, | |
1214 | const struct cpumask *newmask); | |
1215 | ||
1216 | void (*rq_online)(struct rq *rq); | |
1217 | void (*rq_offline)(struct rq *rq); | |
1218 | #endif | |
1219 | ||
1220 | void (*set_curr_task) (struct rq *rq); | |
1221 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); | |
1222 | void (*task_fork) (struct task_struct *p); | |
e6c390f2 | 1223 | void (*task_dead) (struct task_struct *p); |
c82ba9fa | 1224 | |
67dfa1b7 KT |
1225 | /* |
1226 | * The switched_from() call is allowed to drop rq->lock, therefore we | |
1227 | * cannot assume the switched_from/switched_to pair is serliazed by | |
1228 | * rq->lock. They are however serialized by p->pi_lock. | |
1229 | */ | |
c82ba9fa LZ |
1230 | void (*switched_from) (struct rq *this_rq, struct task_struct *task); |
1231 | void (*switched_to) (struct rq *this_rq, struct task_struct *task); | |
1232 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, | |
1233 | int oldprio); | |
1234 | ||
1235 | unsigned int (*get_rr_interval) (struct rq *rq, | |
1236 | struct task_struct *task); | |
1237 | ||
6e998916 SG |
1238 | void (*update_curr) (struct rq *rq); |
1239 | ||
c82ba9fa | 1240 | #ifdef CONFIG_FAIR_GROUP_SCHED |
bc54da21 | 1241 | void (*task_move_group) (struct task_struct *p); |
c82ba9fa LZ |
1242 | #endif |
1243 | }; | |
029632fb | 1244 | |
3f1d2a31 PZ |
1245 | static inline void put_prev_task(struct rq *rq, struct task_struct *prev) |
1246 | { | |
1247 | prev->sched_class->put_prev_task(rq, prev); | |
1248 | } | |
1249 | ||
029632fb PZ |
1250 | #define sched_class_highest (&stop_sched_class) |
1251 | #define for_each_class(class) \ | |
1252 | for (class = sched_class_highest; class; class = class->next) | |
1253 | ||
1254 | extern const struct sched_class stop_sched_class; | |
aab03e05 | 1255 | extern const struct sched_class dl_sched_class; |
029632fb PZ |
1256 | extern const struct sched_class rt_sched_class; |
1257 | extern const struct sched_class fair_sched_class; | |
1258 | extern const struct sched_class idle_sched_class; | |
1259 | ||
1260 | ||
1261 | #ifdef CONFIG_SMP | |
1262 | ||
63b2ca30 | 1263 | extern void update_group_capacity(struct sched_domain *sd, int cpu); |
b719203b | 1264 | |
7caff66f | 1265 | extern void trigger_load_balance(struct rq *rq); |
029632fb | 1266 | |
c5b28038 PZ |
1267 | extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask); |
1268 | ||
029632fb PZ |
1269 | #endif |
1270 | ||
442bf3aa DL |
1271 | #ifdef CONFIG_CPU_IDLE |
1272 | static inline void idle_set_state(struct rq *rq, | |
1273 | struct cpuidle_state *idle_state) | |
1274 | { | |
1275 | rq->idle_state = idle_state; | |
1276 | } | |
1277 | ||
1278 | static inline struct cpuidle_state *idle_get_state(struct rq *rq) | |
1279 | { | |
1280 | WARN_ON(!rcu_read_lock_held()); | |
1281 | return rq->idle_state; | |
1282 | } | |
1283 | #else | |
1284 | static inline void idle_set_state(struct rq *rq, | |
1285 | struct cpuidle_state *idle_state) | |
1286 | { | |
1287 | } | |
1288 | ||
1289 | static inline struct cpuidle_state *idle_get_state(struct rq *rq) | |
1290 | { | |
1291 | return NULL; | |
1292 | } | |
1293 | #endif | |
1294 | ||
029632fb PZ |
1295 | extern void sysrq_sched_debug_show(void); |
1296 | extern void sched_init_granularity(void); | |
1297 | extern void update_max_interval(void); | |
1baca4ce JL |
1298 | |
1299 | extern void init_sched_dl_class(void); | |
029632fb PZ |
1300 | extern void init_sched_rt_class(void); |
1301 | extern void init_sched_fair_class(void); | |
1302 | ||
8875125e | 1303 | extern void resched_curr(struct rq *rq); |
029632fb PZ |
1304 | extern void resched_cpu(int cpu); |
1305 | ||
1306 | extern struct rt_bandwidth def_rt_bandwidth; | |
1307 | extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime); | |
1308 | ||
332ac17e DF |
1309 | extern struct dl_bandwidth def_dl_bandwidth; |
1310 | extern void init_dl_bandwidth(struct dl_bandwidth *dl_b, u64 period, u64 runtime); | |
aab03e05 DF |
1311 | extern void init_dl_task_timer(struct sched_dl_entity *dl_se); |
1312 | ||
332ac17e DF |
1313 | unsigned long to_ratio(u64 period, u64 runtime); |
1314 | ||
540247fb | 1315 | extern void init_entity_runnable_average(struct sched_entity *se); |
a75cdaa9 | 1316 | |
76d92ac3 FW |
1317 | #ifdef CONFIG_NO_HZ_FULL |
1318 | extern bool sched_can_stop_tick(struct rq *rq); | |
1319 | ||
1320 | /* | |
1321 | * Tick may be needed by tasks in the runqueue depending on their policy and | |
1322 | * requirements. If tick is needed, lets send the target an IPI to kick it out of | |
1323 | * nohz mode if necessary. | |
1324 | */ | |
1325 | static inline void sched_update_tick_dependency(struct rq *rq) | |
1326 | { | |
1327 | int cpu; | |
1328 | ||
1329 | if (!tick_nohz_full_enabled()) | |
1330 | return; | |
1331 | ||
1332 | cpu = cpu_of(rq); | |
1333 | ||
1334 | if (!tick_nohz_full_cpu(cpu)) | |
1335 | return; | |
1336 | ||
1337 | if (sched_can_stop_tick(rq)) | |
1338 | tick_nohz_dep_clear_cpu(cpu, TICK_DEP_BIT_SCHED); | |
1339 | else | |
1340 | tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED); | |
1341 | } | |
1342 | #else | |
1343 | static inline void sched_update_tick_dependency(struct rq *rq) { } | |
1344 | #endif | |
1345 | ||
72465447 | 1346 | static inline void add_nr_running(struct rq *rq, unsigned count) |
029632fb | 1347 | { |
72465447 KT |
1348 | unsigned prev_nr = rq->nr_running; |
1349 | ||
1350 | rq->nr_running = prev_nr + count; | |
9f3660c2 | 1351 | |
72465447 | 1352 | if (prev_nr < 2 && rq->nr_running >= 2) { |
4486edd1 TC |
1353 | #ifdef CONFIG_SMP |
1354 | if (!rq->rd->overload) | |
1355 | rq->rd->overload = true; | |
1356 | #endif | |
4486edd1 | 1357 | } |
76d92ac3 FW |
1358 | |
1359 | sched_update_tick_dependency(rq); | |
029632fb PZ |
1360 | } |
1361 | ||
72465447 | 1362 | static inline void sub_nr_running(struct rq *rq, unsigned count) |
029632fb | 1363 | { |
72465447 | 1364 | rq->nr_running -= count; |
76d92ac3 FW |
1365 | /* Check if we still need preemption */ |
1366 | sched_update_tick_dependency(rq); | |
029632fb PZ |
1367 | } |
1368 | ||
265f22a9 FW |
1369 | static inline void rq_last_tick_reset(struct rq *rq) |
1370 | { | |
1371 | #ifdef CONFIG_NO_HZ_FULL | |
1372 | rq->last_sched_tick = jiffies; | |
1373 | #endif | |
1374 | } | |
1375 | ||
029632fb PZ |
1376 | extern void update_rq_clock(struct rq *rq); |
1377 | ||
1378 | extern void activate_task(struct rq *rq, struct task_struct *p, int flags); | |
1379 | extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags); | |
1380 | ||
1381 | extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags); | |
1382 | ||
1383 | extern const_debug unsigned int sysctl_sched_time_avg; | |
1384 | extern const_debug unsigned int sysctl_sched_nr_migrate; | |
1385 | extern const_debug unsigned int sysctl_sched_migration_cost; | |
1386 | ||
1387 | static inline u64 sched_avg_period(void) | |
1388 | { | |
1389 | return (u64)sysctl_sched_time_avg * NSEC_PER_MSEC / 2; | |
1390 | } | |
1391 | ||
029632fb PZ |
1392 | #ifdef CONFIG_SCHED_HRTICK |
1393 | ||
1394 | /* | |
1395 | * Use hrtick when: | |
1396 | * - enabled by features | |
1397 | * - hrtimer is actually high res | |
1398 | */ | |
1399 | static inline int hrtick_enabled(struct rq *rq) | |
1400 | { | |
1401 | if (!sched_feat(HRTICK)) | |
1402 | return 0; | |
1403 | if (!cpu_active(cpu_of(rq))) | |
1404 | return 0; | |
1405 | return hrtimer_is_hres_active(&rq->hrtick_timer); | |
1406 | } | |
1407 | ||
1408 | void hrtick_start(struct rq *rq, u64 delay); | |
1409 | ||
b39e66ea MG |
1410 | #else |
1411 | ||
1412 | static inline int hrtick_enabled(struct rq *rq) | |
1413 | { | |
1414 | return 0; | |
1415 | } | |
1416 | ||
029632fb PZ |
1417 | #endif /* CONFIG_SCHED_HRTICK */ |
1418 | ||
1419 | #ifdef CONFIG_SMP | |
1420 | extern void sched_avg_update(struct rq *rq); | |
dfbca41f PZ |
1421 | |
1422 | #ifndef arch_scale_freq_capacity | |
1423 | static __always_inline | |
1424 | unsigned long arch_scale_freq_capacity(struct sched_domain *sd, int cpu) | |
1425 | { | |
1426 | return SCHED_CAPACITY_SCALE; | |
1427 | } | |
1428 | #endif | |
b5b4860d | 1429 | |
8cd5601c MR |
1430 | #ifndef arch_scale_cpu_capacity |
1431 | static __always_inline | |
1432 | unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu) | |
1433 | { | |
e3279a2e | 1434 | if (sd && (sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1)) |
8cd5601c MR |
1435 | return sd->smt_gain / sd->span_weight; |
1436 | ||
1437 | return SCHED_CAPACITY_SCALE; | |
1438 | } | |
1439 | #endif | |
1440 | ||
029632fb PZ |
1441 | static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) |
1442 | { | |
b5b4860d | 1443 | rq->rt_avg += rt_delta * arch_scale_freq_capacity(NULL, cpu_of(rq)); |
029632fb PZ |
1444 | sched_avg_update(rq); |
1445 | } | |
1446 | #else | |
1447 | static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { } | |
1448 | static inline void sched_avg_update(struct rq *rq) { } | |
1449 | #endif | |
1450 | ||
3960c8c0 PZ |
1451 | /* |
1452 | * __task_rq_lock - lock the rq @p resides on. | |
1453 | */ | |
1454 | static inline struct rq *__task_rq_lock(struct task_struct *p) | |
1455 | __acquires(rq->lock) | |
1456 | { | |
1457 | struct rq *rq; | |
1458 | ||
1459 | lockdep_assert_held(&p->pi_lock); | |
1460 | ||
1461 | for (;;) { | |
1462 | rq = task_rq(p); | |
1463 | raw_spin_lock(&rq->lock); | |
cbce1a68 PZ |
1464 | if (likely(rq == task_rq(p) && !task_on_rq_migrating(p))) { |
1465 | lockdep_pin_lock(&rq->lock); | |
3960c8c0 | 1466 | return rq; |
cbce1a68 | 1467 | } |
3960c8c0 PZ |
1468 | raw_spin_unlock(&rq->lock); |
1469 | ||
1470 | while (unlikely(task_on_rq_migrating(p))) | |
1471 | cpu_relax(); | |
1472 | } | |
1473 | } | |
1474 | ||
1475 | /* | |
1476 | * task_rq_lock - lock p->pi_lock and lock the rq @p resides on. | |
1477 | */ | |
1478 | static inline struct rq *task_rq_lock(struct task_struct *p, unsigned long *flags) | |
1479 | __acquires(p->pi_lock) | |
1480 | __acquires(rq->lock) | |
1481 | { | |
1482 | struct rq *rq; | |
1483 | ||
1484 | for (;;) { | |
1485 | raw_spin_lock_irqsave(&p->pi_lock, *flags); | |
1486 | rq = task_rq(p); | |
1487 | raw_spin_lock(&rq->lock); | |
1488 | /* | |
1489 | * move_queued_task() task_rq_lock() | |
1490 | * | |
1491 | * ACQUIRE (rq->lock) | |
1492 | * [S] ->on_rq = MIGRATING [L] rq = task_rq() | |
1493 | * WMB (__set_task_cpu()) ACQUIRE (rq->lock); | |
1494 | * [S] ->cpu = new_cpu [L] task_rq() | |
1495 | * [L] ->on_rq | |
1496 | * RELEASE (rq->lock) | |
1497 | * | |
1498 | * If we observe the old cpu in task_rq_lock, the acquire of | |
1499 | * the old rq->lock will fully serialize against the stores. | |
1500 | * | |
1501 | * If we observe the new cpu in task_rq_lock, the acquire will | |
1502 | * pair with the WMB to ensure we must then also see migrating. | |
1503 | */ | |
cbce1a68 PZ |
1504 | if (likely(rq == task_rq(p) && !task_on_rq_migrating(p))) { |
1505 | lockdep_pin_lock(&rq->lock); | |
3960c8c0 | 1506 | return rq; |
cbce1a68 | 1507 | } |
3960c8c0 PZ |
1508 | raw_spin_unlock(&rq->lock); |
1509 | raw_spin_unlock_irqrestore(&p->pi_lock, *flags); | |
1510 | ||
1511 | while (unlikely(task_on_rq_migrating(p))) | |
1512 | cpu_relax(); | |
1513 | } | |
1514 | } | |
1515 | ||
1516 | static inline void __task_rq_unlock(struct rq *rq) | |
1517 | __releases(rq->lock) | |
1518 | { | |
cbce1a68 | 1519 | lockdep_unpin_lock(&rq->lock); |
3960c8c0 PZ |
1520 | raw_spin_unlock(&rq->lock); |
1521 | } | |
1522 | ||
1523 | static inline void | |
1524 | task_rq_unlock(struct rq *rq, struct task_struct *p, unsigned long *flags) | |
1525 | __releases(rq->lock) | |
1526 | __releases(p->pi_lock) | |
1527 | { | |
cbce1a68 | 1528 | lockdep_unpin_lock(&rq->lock); |
3960c8c0 PZ |
1529 | raw_spin_unlock(&rq->lock); |
1530 | raw_spin_unlock_irqrestore(&p->pi_lock, *flags); | |
1531 | } | |
1532 | ||
029632fb PZ |
1533 | #ifdef CONFIG_SMP |
1534 | #ifdef CONFIG_PREEMPT | |
1535 | ||
1536 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2); | |
1537 | ||
1538 | /* | |
1539 | * fair double_lock_balance: Safely acquires both rq->locks in a fair | |
1540 | * way at the expense of forcing extra atomic operations in all | |
1541 | * invocations. This assures that the double_lock is acquired using the | |
1542 | * same underlying policy as the spinlock_t on this architecture, which | |
1543 | * reduces latency compared to the unfair variant below. However, it | |
1544 | * also adds more overhead and therefore may reduce throughput. | |
1545 | */ | |
1546 | static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
1547 | __releases(this_rq->lock) | |
1548 | __acquires(busiest->lock) | |
1549 | __acquires(this_rq->lock) | |
1550 | { | |
1551 | raw_spin_unlock(&this_rq->lock); | |
1552 | double_rq_lock(this_rq, busiest); | |
1553 | ||
1554 | return 1; | |
1555 | } | |
1556 | ||
1557 | #else | |
1558 | /* | |
1559 | * Unfair double_lock_balance: Optimizes throughput at the expense of | |
1560 | * latency by eliminating extra atomic operations when the locks are | |
1561 | * already in proper order on entry. This favors lower cpu-ids and will | |
1562 | * grant the double lock to lower cpus over higher ids under contention, | |
1563 | * regardless of entry order into the function. | |
1564 | */ | |
1565 | static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
1566 | __releases(this_rq->lock) | |
1567 | __acquires(busiest->lock) | |
1568 | __acquires(this_rq->lock) | |
1569 | { | |
1570 | int ret = 0; | |
1571 | ||
1572 | if (unlikely(!raw_spin_trylock(&busiest->lock))) { | |
1573 | if (busiest < this_rq) { | |
1574 | raw_spin_unlock(&this_rq->lock); | |
1575 | raw_spin_lock(&busiest->lock); | |
1576 | raw_spin_lock_nested(&this_rq->lock, | |
1577 | SINGLE_DEPTH_NESTING); | |
1578 | ret = 1; | |
1579 | } else | |
1580 | raw_spin_lock_nested(&busiest->lock, | |
1581 | SINGLE_DEPTH_NESTING); | |
1582 | } | |
1583 | return ret; | |
1584 | } | |
1585 | ||
1586 | #endif /* CONFIG_PREEMPT */ | |
1587 | ||
1588 | /* | |
1589 | * double_lock_balance - lock the busiest runqueue, this_rq is locked already. | |
1590 | */ | |
1591 | static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
1592 | { | |
1593 | if (unlikely(!irqs_disabled())) { | |
1594 | /* printk() doesn't work good under rq->lock */ | |
1595 | raw_spin_unlock(&this_rq->lock); | |
1596 | BUG_ON(1); | |
1597 | } | |
1598 | ||
1599 | return _double_lock_balance(this_rq, busiest); | |
1600 | } | |
1601 | ||
1602 | static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest) | |
1603 | __releases(busiest->lock) | |
1604 | { | |
1605 | raw_spin_unlock(&busiest->lock); | |
1606 | lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_); | |
1607 | } | |
1608 | ||
74602315 PZ |
1609 | static inline void double_lock(spinlock_t *l1, spinlock_t *l2) |
1610 | { | |
1611 | if (l1 > l2) | |
1612 | swap(l1, l2); | |
1613 | ||
1614 | spin_lock(l1); | |
1615 | spin_lock_nested(l2, SINGLE_DEPTH_NESTING); | |
1616 | } | |
1617 | ||
60e69eed MG |
1618 | static inline void double_lock_irq(spinlock_t *l1, spinlock_t *l2) |
1619 | { | |
1620 | if (l1 > l2) | |
1621 | swap(l1, l2); | |
1622 | ||
1623 | spin_lock_irq(l1); | |
1624 | spin_lock_nested(l2, SINGLE_DEPTH_NESTING); | |
1625 | } | |
1626 | ||
74602315 PZ |
1627 | static inline void double_raw_lock(raw_spinlock_t *l1, raw_spinlock_t *l2) |
1628 | { | |
1629 | if (l1 > l2) | |
1630 | swap(l1, l2); | |
1631 | ||
1632 | raw_spin_lock(l1); | |
1633 | raw_spin_lock_nested(l2, SINGLE_DEPTH_NESTING); | |
1634 | } | |
1635 | ||
029632fb PZ |
1636 | /* |
1637 | * double_rq_lock - safely lock two runqueues | |
1638 | * | |
1639 | * Note this does not disable interrupts like task_rq_lock, | |
1640 | * you need to do so manually before calling. | |
1641 | */ | |
1642 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) | |
1643 | __acquires(rq1->lock) | |
1644 | __acquires(rq2->lock) | |
1645 | { | |
1646 | BUG_ON(!irqs_disabled()); | |
1647 | if (rq1 == rq2) { | |
1648 | raw_spin_lock(&rq1->lock); | |
1649 | __acquire(rq2->lock); /* Fake it out ;) */ | |
1650 | } else { | |
1651 | if (rq1 < rq2) { | |
1652 | raw_spin_lock(&rq1->lock); | |
1653 | raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING); | |
1654 | } else { | |
1655 | raw_spin_lock(&rq2->lock); | |
1656 | raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING); | |
1657 | } | |
1658 | } | |
1659 | } | |
1660 | ||
1661 | /* | |
1662 | * double_rq_unlock - safely unlock two runqueues | |
1663 | * | |
1664 | * Note this does not restore interrupts like task_rq_unlock, | |
1665 | * you need to do so manually after calling. | |
1666 | */ | |
1667 | static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) | |
1668 | __releases(rq1->lock) | |
1669 | __releases(rq2->lock) | |
1670 | { | |
1671 | raw_spin_unlock(&rq1->lock); | |
1672 | if (rq1 != rq2) | |
1673 | raw_spin_unlock(&rq2->lock); | |
1674 | else | |
1675 | __release(rq2->lock); | |
1676 | } | |
1677 | ||
1678 | #else /* CONFIG_SMP */ | |
1679 | ||
1680 | /* | |
1681 | * double_rq_lock - safely lock two runqueues | |
1682 | * | |
1683 | * Note this does not disable interrupts like task_rq_lock, | |
1684 | * you need to do so manually before calling. | |
1685 | */ | |
1686 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) | |
1687 | __acquires(rq1->lock) | |
1688 | __acquires(rq2->lock) | |
1689 | { | |
1690 | BUG_ON(!irqs_disabled()); | |
1691 | BUG_ON(rq1 != rq2); | |
1692 | raw_spin_lock(&rq1->lock); | |
1693 | __acquire(rq2->lock); /* Fake it out ;) */ | |
1694 | } | |
1695 | ||
1696 | /* | |
1697 | * double_rq_unlock - safely unlock two runqueues | |
1698 | * | |
1699 | * Note this does not restore interrupts like task_rq_unlock, | |
1700 | * you need to do so manually after calling. | |
1701 | */ | |
1702 | static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) | |
1703 | __releases(rq1->lock) | |
1704 | __releases(rq2->lock) | |
1705 | { | |
1706 | BUG_ON(rq1 != rq2); | |
1707 | raw_spin_unlock(&rq1->lock); | |
1708 | __release(rq2->lock); | |
1709 | } | |
1710 | ||
1711 | #endif | |
1712 | ||
1713 | extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq); | |
1714 | extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq); | |
6b55c965 SD |
1715 | |
1716 | #ifdef CONFIG_SCHED_DEBUG | |
029632fb PZ |
1717 | extern void print_cfs_stats(struct seq_file *m, int cpu); |
1718 | extern void print_rt_stats(struct seq_file *m, int cpu); | |
acb32132 | 1719 | extern void print_dl_stats(struct seq_file *m, int cpu); |
6b55c965 SD |
1720 | extern void |
1721 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); | |
397f2378 SD |
1722 | |
1723 | #ifdef CONFIG_NUMA_BALANCING | |
1724 | extern void | |
1725 | show_numa_stats(struct task_struct *p, struct seq_file *m); | |
1726 | extern void | |
1727 | print_numa_stats(struct seq_file *m, int node, unsigned long tsf, | |
1728 | unsigned long tpf, unsigned long gsf, unsigned long gpf); | |
1729 | #endif /* CONFIG_NUMA_BALANCING */ | |
1730 | #endif /* CONFIG_SCHED_DEBUG */ | |
029632fb PZ |
1731 | |
1732 | extern void init_cfs_rq(struct cfs_rq *cfs_rq); | |
07c54f7a AV |
1733 | extern void init_rt_rq(struct rt_rq *rt_rq); |
1734 | extern void init_dl_rq(struct dl_rq *dl_rq); | |
029632fb | 1735 | |
1ee14e6c BS |
1736 | extern void cfs_bandwidth_usage_inc(void); |
1737 | extern void cfs_bandwidth_usage_dec(void); | |
1c792db7 | 1738 | |
3451d024 | 1739 | #ifdef CONFIG_NO_HZ_COMMON |
1c792db7 SS |
1740 | enum rq_nohz_flag_bits { |
1741 | NOHZ_TICK_STOPPED, | |
1742 | NOHZ_BALANCE_KICK, | |
1743 | }; | |
1744 | ||
1745 | #define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags) | |
1746 | #endif | |
73fbec60 FW |
1747 | |
1748 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING | |
1749 | ||
1750 | DECLARE_PER_CPU(u64, cpu_hardirq_time); | |
1751 | DECLARE_PER_CPU(u64, cpu_softirq_time); | |
1752 | ||
1753 | #ifndef CONFIG_64BIT | |
1754 | DECLARE_PER_CPU(seqcount_t, irq_time_seq); | |
1755 | ||
1756 | static inline void irq_time_write_begin(void) | |
1757 | { | |
1758 | __this_cpu_inc(irq_time_seq.sequence); | |
1759 | smp_wmb(); | |
1760 | } | |
1761 | ||
1762 | static inline void irq_time_write_end(void) | |
1763 | { | |
1764 | smp_wmb(); | |
1765 | __this_cpu_inc(irq_time_seq.sequence); | |
1766 | } | |
1767 | ||
1768 | static inline u64 irq_time_read(int cpu) | |
1769 | { | |
1770 | u64 irq_time; | |
1771 | unsigned seq; | |
1772 | ||
1773 | do { | |
1774 | seq = read_seqcount_begin(&per_cpu(irq_time_seq, cpu)); | |
1775 | irq_time = per_cpu(cpu_softirq_time, cpu) + | |
1776 | per_cpu(cpu_hardirq_time, cpu); | |
1777 | } while (read_seqcount_retry(&per_cpu(irq_time_seq, cpu), seq)); | |
1778 | ||
1779 | return irq_time; | |
1780 | } | |
1781 | #else /* CONFIG_64BIT */ | |
1782 | static inline void irq_time_write_begin(void) | |
1783 | { | |
1784 | } | |
1785 | ||
1786 | static inline void irq_time_write_end(void) | |
1787 | { | |
1788 | } | |
1789 | ||
1790 | static inline u64 irq_time_read(int cpu) | |
1791 | { | |
1792 | return per_cpu(cpu_softirq_time, cpu) + per_cpu(cpu_hardirq_time, cpu); | |
1793 | } | |
1794 | #endif /* CONFIG_64BIT */ | |
1795 | #endif /* CONFIG_IRQ_TIME_ACCOUNTING */ | |
adaf9fcd RW |
1796 | |
1797 | #ifdef CONFIG_CPU_FREQ | |
1798 | DECLARE_PER_CPU(struct update_util_data *, cpufreq_update_util_data); | |
1799 | ||
1800 | /** | |
1801 | * cpufreq_update_util - Take a note about CPU utilization changes. | |
1802 | * @time: Current time. | |
1803 | * @util: Current utilization. | |
1804 | * @max: Utilization ceiling. | |
1805 | * | |
1806 | * This function is called by the scheduler on every invocation of | |
1807 | * update_load_avg() on the CPU whose utilization is being updated. | |
1808 | * | |
1809 | * It can only be called from RCU-sched read-side critical sections. | |
1810 | */ | |
1811 | static inline void cpufreq_update_util(u64 time, unsigned long util, unsigned long max) | |
1812 | { | |
1813 | struct update_util_data *data; | |
1814 | ||
1815 | data = rcu_dereference_sched(*this_cpu_ptr(&cpufreq_update_util_data)); | |
1816 | if (data) | |
1817 | data->func(data, time, util, max); | |
1818 | } | |
1819 | ||
1820 | /** | |
1821 | * cpufreq_trigger_update - Trigger CPU performance state evaluation if needed. | |
1822 | * @time: Current time. | |
1823 | * | |
1824 | * The way cpufreq is currently arranged requires it to evaluate the CPU | |
1825 | * performance state (frequency/voltage) on a regular basis to prevent it from | |
1826 | * being stuck in a completely inadequate performance level for too long. | |
1827 | * That is not guaranteed to happen if the updates are only triggered from CFS, | |
1828 | * though, because they may not be coming in if RT or deadline tasks are active | |
1829 | * all the time (or there are RT and DL tasks only). | |
1830 | * | |
1831 | * As a workaround for that issue, this function is called by the RT and DL | |
1832 | * sched classes to trigger extra cpufreq updates to prevent it from stalling, | |
1833 | * but that really is a band-aid. Going forward it should be replaced with | |
1834 | * solutions targeted more specifically at RT and DL tasks. | |
1835 | */ | |
1836 | static inline void cpufreq_trigger_update(u64 time) | |
1837 | { | |
1838 | cpufreq_update_util(time, ULONG_MAX, 0); | |
1839 | } | |
1840 | #else | |
1841 | static inline void cpufreq_update_util(u64 time, unsigned long util, unsigned long max) {} | |
1842 | static inline void cpufreq_trigger_update(u64 time) {} | |
1843 | #endif /* CONFIG_CPU_FREQ */ | |
be53f58f | 1844 | |
e9532e69 TG |
1845 | static inline void account_reset_rq(struct rq *rq) |
1846 | { | |
1847 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING | |
1848 | rq->prev_irq_time = 0; | |
1849 | #endif | |
1850 | #ifdef CONFIG_PARAVIRT | |
1851 | rq->prev_steal_time = 0; | |
1852 | #endif | |
1853 | #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING | |
1854 | rq->prev_steal_time_rq = 0; | |
1855 | #endif | |
1856 | } |