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029632fb PZ |
1 | |
2 | #include <linux/sched.h> | |
3 | #include <linux/mutex.h> | |
4 | #include <linux/spinlock.h> | |
5 | #include <linux/stop_machine.h> | |
6 | ||
391e43da | 7 | #include "cpupri.h" |
029632fb PZ |
8 | |
9 | extern __read_mostly int scheduler_running; | |
10 | ||
11 | /* | |
12 | * Convert user-nice values [ -20 ... 0 ... 19 ] | |
13 | * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ], | |
14 | * and back. | |
15 | */ | |
16 | #define NICE_TO_PRIO(nice) (MAX_RT_PRIO + (nice) + 20) | |
17 | #define PRIO_TO_NICE(prio) ((prio) - MAX_RT_PRIO - 20) | |
18 | #define TASK_NICE(p) PRIO_TO_NICE((p)->static_prio) | |
19 | ||
20 | /* | |
21 | * 'User priority' is the nice value converted to something we | |
22 | * can work with better when scaling various scheduler parameters, | |
23 | * it's a [ 0 ... 39 ] range. | |
24 | */ | |
25 | #define USER_PRIO(p) ((p)-MAX_RT_PRIO) | |
26 | #define TASK_USER_PRIO(p) USER_PRIO((p)->static_prio) | |
27 | #define MAX_USER_PRIO (USER_PRIO(MAX_PRIO)) | |
28 | ||
29 | /* | |
30 | * Helpers for converting nanosecond timing to jiffy resolution | |
31 | */ | |
32 | #define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ)) | |
33 | ||
34 | #define NICE_0_LOAD SCHED_LOAD_SCALE | |
35 | #define NICE_0_SHIFT SCHED_LOAD_SHIFT | |
36 | ||
37 | /* | |
38 | * These are the 'tuning knobs' of the scheduler: | |
029632fb | 39 | */ |
029632fb PZ |
40 | |
41 | /* | |
42 | * single value that denotes runtime == period, ie unlimited time. | |
43 | */ | |
44 | #define RUNTIME_INF ((u64)~0ULL) | |
45 | ||
46 | static inline int rt_policy(int policy) | |
47 | { | |
48 | if (policy == SCHED_FIFO || policy == SCHED_RR) | |
49 | return 1; | |
50 | return 0; | |
51 | } | |
52 | ||
53 | static inline int task_has_rt_policy(struct task_struct *p) | |
54 | { | |
55 | return rt_policy(p->policy); | |
56 | } | |
57 | ||
58 | /* | |
59 | * This is the priority-queue data structure of the RT scheduling class: | |
60 | */ | |
61 | struct rt_prio_array { | |
62 | DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */ | |
63 | struct list_head queue[MAX_RT_PRIO]; | |
64 | }; | |
65 | ||
66 | struct rt_bandwidth { | |
67 | /* nests inside the rq lock: */ | |
68 | raw_spinlock_t rt_runtime_lock; | |
69 | ktime_t rt_period; | |
70 | u64 rt_runtime; | |
71 | struct hrtimer rt_period_timer; | |
72 | }; | |
73 | ||
74 | extern struct mutex sched_domains_mutex; | |
75 | ||
76 | #ifdef CONFIG_CGROUP_SCHED | |
77 | ||
78 | #include <linux/cgroup.h> | |
79 | ||
80 | struct cfs_rq; | |
81 | struct rt_rq; | |
82 | ||
35cf4e50 | 83 | extern struct list_head task_groups; |
029632fb PZ |
84 | |
85 | struct cfs_bandwidth { | |
86 | #ifdef CONFIG_CFS_BANDWIDTH | |
87 | raw_spinlock_t lock; | |
88 | ktime_t period; | |
89 | u64 quota, runtime; | |
90 | s64 hierarchal_quota; | |
91 | u64 runtime_expires; | |
92 | ||
93 | int idle, timer_active; | |
94 | struct hrtimer period_timer, slack_timer; | |
95 | struct list_head throttled_cfs_rq; | |
96 | ||
97 | /* statistics */ | |
98 | int nr_periods, nr_throttled; | |
99 | u64 throttled_time; | |
100 | #endif | |
101 | }; | |
102 | ||
103 | /* task group related information */ | |
104 | struct task_group { | |
105 | struct cgroup_subsys_state css; | |
106 | ||
107 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
108 | /* schedulable entities of this group on each cpu */ | |
109 | struct sched_entity **se; | |
110 | /* runqueue "owned" by this group on each cpu */ | |
111 | struct cfs_rq **cfs_rq; | |
112 | unsigned long shares; | |
113 | ||
114 | atomic_t load_weight; | |
115 | #endif | |
116 | ||
117 | #ifdef CONFIG_RT_GROUP_SCHED | |
118 | struct sched_rt_entity **rt_se; | |
119 | struct rt_rq **rt_rq; | |
120 | ||
121 | struct rt_bandwidth rt_bandwidth; | |
122 | #endif | |
123 | ||
124 | struct rcu_head rcu; | |
125 | struct list_head list; | |
126 | ||
127 | struct task_group *parent; | |
128 | struct list_head siblings; | |
129 | struct list_head children; | |
130 | ||
131 | #ifdef CONFIG_SCHED_AUTOGROUP | |
132 | struct autogroup *autogroup; | |
133 | #endif | |
134 | ||
135 | struct cfs_bandwidth cfs_bandwidth; | |
136 | }; | |
137 | ||
138 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
139 | #define ROOT_TASK_GROUP_LOAD NICE_0_LOAD | |
140 | ||
141 | /* | |
142 | * A weight of 0 or 1 can cause arithmetics problems. | |
143 | * A weight of a cfs_rq is the sum of weights of which entities | |
144 | * are queued on this cfs_rq, so a weight of a entity should not be | |
145 | * too large, so as the shares value of a task group. | |
146 | * (The default weight is 1024 - so there's no practical | |
147 | * limitation from this.) | |
148 | */ | |
149 | #define MIN_SHARES (1UL << 1) | |
150 | #define MAX_SHARES (1UL << 18) | |
151 | #endif | |
152 | ||
153 | /* Default task group. | |
154 | * Every task in system belong to this group at bootup. | |
155 | */ | |
156 | extern struct task_group root_task_group; | |
157 | ||
158 | typedef int (*tg_visitor)(struct task_group *, void *); | |
159 | ||
160 | extern int walk_tg_tree_from(struct task_group *from, | |
161 | tg_visitor down, tg_visitor up, void *data); | |
162 | ||
163 | /* | |
164 | * Iterate the full tree, calling @down when first entering a node and @up when | |
165 | * leaving it for the final time. | |
166 | * | |
167 | * Caller must hold rcu_lock or sufficient equivalent. | |
168 | */ | |
169 | static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data) | |
170 | { | |
171 | return walk_tg_tree_from(&root_task_group, down, up, data); | |
172 | } | |
173 | ||
174 | extern int tg_nop(struct task_group *tg, void *data); | |
175 | ||
176 | extern void free_fair_sched_group(struct task_group *tg); | |
177 | extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent); | |
178 | extern void unregister_fair_sched_group(struct task_group *tg, int cpu); | |
179 | extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq, | |
180 | struct sched_entity *se, int cpu, | |
181 | struct sched_entity *parent); | |
182 | extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b); | |
183 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); | |
184 | ||
185 | extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b); | |
186 | extern void __start_cfs_bandwidth(struct cfs_bandwidth *cfs_b); | |
187 | extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq); | |
188 | ||
189 | extern void free_rt_sched_group(struct task_group *tg); | |
190 | extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent); | |
191 | extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq, | |
192 | struct sched_rt_entity *rt_se, int cpu, | |
193 | struct sched_rt_entity *parent); | |
194 | ||
195 | #else /* CONFIG_CGROUP_SCHED */ | |
196 | ||
197 | struct cfs_bandwidth { }; | |
198 | ||
199 | #endif /* CONFIG_CGROUP_SCHED */ | |
200 | ||
201 | /* CFS-related fields in a runqueue */ | |
202 | struct cfs_rq { | |
203 | struct load_weight load; | |
c82513e5 | 204 | unsigned int nr_running, h_nr_running; |
029632fb PZ |
205 | |
206 | u64 exec_clock; | |
207 | u64 min_vruntime; | |
208 | #ifndef CONFIG_64BIT | |
209 | u64 min_vruntime_copy; | |
210 | #endif | |
211 | ||
212 | struct rb_root tasks_timeline; | |
213 | struct rb_node *rb_leftmost; | |
214 | ||
029632fb PZ |
215 | /* |
216 | * 'curr' points to currently running entity on this cfs_rq. | |
217 | * It is set to NULL otherwise (i.e when none are currently running). | |
218 | */ | |
219 | struct sched_entity *curr, *next, *last, *skip; | |
220 | ||
221 | #ifdef CONFIG_SCHED_DEBUG | |
222 | unsigned int nr_spread_over; | |
223 | #endif | |
224 | ||
225 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
226 | struct rq *rq; /* cpu runqueue to which this cfs_rq is attached */ | |
227 | ||
228 | /* | |
229 | * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in | |
230 | * a hierarchy). Non-leaf lrqs hold other higher schedulable entities | |
231 | * (like users, containers etc.) | |
232 | * | |
233 | * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a cpu. This | |
234 | * list is used during load balance. | |
235 | */ | |
236 | int on_list; | |
237 | struct list_head leaf_cfs_rq_list; | |
238 | struct task_group *tg; /* group that "owns" this runqueue */ | |
239 | ||
240 | #ifdef CONFIG_SMP | |
029632fb PZ |
241 | /* |
242 | * h_load = weight * f(tg) | |
243 | * | |
244 | * Where f(tg) is the recursive weight fraction assigned to | |
245 | * this group. | |
246 | */ | |
247 | unsigned long h_load; | |
248 | ||
249 | /* | |
250 | * Maintaining per-cpu shares distribution for group scheduling | |
251 | * | |
252 | * load_stamp is the last time we updated the load average | |
253 | * load_last is the last time we updated the load average and saw load | |
254 | * load_unacc_exec_time is currently unaccounted execution time | |
255 | */ | |
256 | u64 load_avg; | |
257 | u64 load_period; | |
258 | u64 load_stamp, load_last, load_unacc_exec_time; | |
259 | ||
260 | unsigned long load_contribution; | |
261 | #endif /* CONFIG_SMP */ | |
262 | #ifdef CONFIG_CFS_BANDWIDTH | |
263 | int runtime_enabled; | |
264 | u64 runtime_expires; | |
265 | s64 runtime_remaining; | |
266 | ||
267 | u64 throttled_timestamp; | |
268 | int throttled, throttle_count; | |
269 | struct list_head throttled_list; | |
270 | #endif /* CONFIG_CFS_BANDWIDTH */ | |
271 | #endif /* CONFIG_FAIR_GROUP_SCHED */ | |
272 | }; | |
273 | ||
274 | static inline int rt_bandwidth_enabled(void) | |
275 | { | |
276 | return sysctl_sched_rt_runtime >= 0; | |
277 | } | |
278 | ||
279 | /* Real-Time classes' related field in a runqueue: */ | |
280 | struct rt_rq { | |
281 | struct rt_prio_array active; | |
c82513e5 | 282 | unsigned int rt_nr_running; |
029632fb PZ |
283 | #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED |
284 | struct { | |
285 | int curr; /* highest queued rt task prio */ | |
286 | #ifdef CONFIG_SMP | |
287 | int next; /* next highest */ | |
288 | #endif | |
289 | } highest_prio; | |
290 | #endif | |
291 | #ifdef CONFIG_SMP | |
292 | unsigned long rt_nr_migratory; | |
293 | unsigned long rt_nr_total; | |
294 | int overloaded; | |
295 | struct plist_head pushable_tasks; | |
296 | #endif | |
297 | int rt_throttled; | |
298 | u64 rt_time; | |
299 | u64 rt_runtime; | |
300 | /* Nests inside the rq lock: */ | |
301 | raw_spinlock_t rt_runtime_lock; | |
302 | ||
303 | #ifdef CONFIG_RT_GROUP_SCHED | |
304 | unsigned long rt_nr_boosted; | |
305 | ||
306 | struct rq *rq; | |
307 | struct list_head leaf_rt_rq_list; | |
308 | struct task_group *tg; | |
309 | #endif | |
310 | }; | |
311 | ||
312 | #ifdef CONFIG_SMP | |
313 | ||
314 | /* | |
315 | * We add the notion of a root-domain which will be used to define per-domain | |
316 | * variables. Each exclusive cpuset essentially defines an island domain by | |
317 | * fully partitioning the member cpus from any other cpuset. Whenever a new | |
318 | * exclusive cpuset is created, we also create and attach a new root-domain | |
319 | * object. | |
320 | * | |
321 | */ | |
322 | struct root_domain { | |
323 | atomic_t refcount; | |
324 | atomic_t rto_count; | |
325 | struct rcu_head rcu; | |
326 | cpumask_var_t span; | |
327 | cpumask_var_t online; | |
328 | ||
329 | /* | |
330 | * The "RT overload" flag: it gets set if a CPU has more than | |
331 | * one runnable RT task. | |
332 | */ | |
333 | cpumask_var_t rto_mask; | |
334 | struct cpupri cpupri; | |
335 | }; | |
336 | ||
337 | extern struct root_domain def_root_domain; | |
338 | ||
339 | #endif /* CONFIG_SMP */ | |
340 | ||
341 | /* | |
342 | * This is the main, per-CPU runqueue data structure. | |
343 | * | |
344 | * Locking rule: those places that want to lock multiple runqueues | |
345 | * (such as the load balancing or the thread migration code), lock | |
346 | * acquire operations must be ordered by ascending &runqueue. | |
347 | */ | |
348 | struct rq { | |
349 | /* runqueue lock: */ | |
350 | raw_spinlock_t lock; | |
351 | ||
352 | /* | |
353 | * nr_running and cpu_load should be in the same cacheline because | |
354 | * remote CPUs use both these fields when doing load calculation. | |
355 | */ | |
c82513e5 | 356 | unsigned int nr_running; |
029632fb PZ |
357 | #define CPU_LOAD_IDX_MAX 5 |
358 | unsigned long cpu_load[CPU_LOAD_IDX_MAX]; | |
359 | unsigned long last_load_update_tick; | |
360 | #ifdef CONFIG_NO_HZ | |
361 | u64 nohz_stamp; | |
1c792db7 | 362 | unsigned long nohz_flags; |
029632fb PZ |
363 | #endif |
364 | int skip_clock_update; | |
365 | ||
366 | /* capture load from *all* tasks on this cpu: */ | |
367 | struct load_weight load; | |
368 | unsigned long nr_load_updates; | |
369 | u64 nr_switches; | |
370 | ||
371 | struct cfs_rq cfs; | |
372 | struct rt_rq rt; | |
373 | ||
374 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
375 | /* list of leaf cfs_rq on this cpu: */ | |
376 | struct list_head leaf_cfs_rq_list; | |
a35b6466 PZ |
377 | #ifdef CONFIG_SMP |
378 | unsigned long h_load_throttle; | |
379 | #endif /* CONFIG_SMP */ | |
380 | #endif /* CONFIG_FAIR_GROUP_SCHED */ | |
381 | ||
029632fb PZ |
382 | #ifdef CONFIG_RT_GROUP_SCHED |
383 | struct list_head leaf_rt_rq_list; | |
384 | #endif | |
385 | ||
386 | /* | |
387 | * This is part of a global counter where only the total sum | |
388 | * over all CPUs matters. A task can increase this counter on | |
389 | * one CPU and if it got migrated afterwards it may decrease | |
390 | * it on another CPU. Always updated under the runqueue lock: | |
391 | */ | |
392 | unsigned long nr_uninterruptible; | |
393 | ||
394 | struct task_struct *curr, *idle, *stop; | |
395 | unsigned long next_balance; | |
396 | struct mm_struct *prev_mm; | |
397 | ||
398 | u64 clock; | |
399 | u64 clock_task; | |
400 | ||
401 | atomic_t nr_iowait; | |
402 | ||
403 | #ifdef CONFIG_SMP | |
404 | struct root_domain *rd; | |
405 | struct sched_domain *sd; | |
406 | ||
407 | unsigned long cpu_power; | |
408 | ||
409 | unsigned char idle_balance; | |
410 | /* For active balancing */ | |
411 | int post_schedule; | |
412 | int active_balance; | |
413 | int push_cpu; | |
414 | struct cpu_stop_work active_balance_work; | |
415 | /* cpu of this runqueue: */ | |
416 | int cpu; | |
417 | int online; | |
418 | ||
367456c7 PZ |
419 | struct list_head cfs_tasks; |
420 | ||
029632fb PZ |
421 | u64 rt_avg; |
422 | u64 age_stamp; | |
423 | u64 idle_stamp; | |
424 | u64 avg_idle; | |
425 | #endif | |
426 | ||
427 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING | |
428 | u64 prev_irq_time; | |
429 | #endif | |
430 | #ifdef CONFIG_PARAVIRT | |
431 | u64 prev_steal_time; | |
432 | #endif | |
433 | #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING | |
434 | u64 prev_steal_time_rq; | |
435 | #endif | |
436 | ||
437 | /* calc_load related fields */ | |
438 | unsigned long calc_load_update; | |
439 | long calc_load_active; | |
440 | ||
441 | #ifdef CONFIG_SCHED_HRTICK | |
442 | #ifdef CONFIG_SMP | |
443 | int hrtick_csd_pending; | |
444 | struct call_single_data hrtick_csd; | |
445 | #endif | |
446 | struct hrtimer hrtick_timer; | |
447 | #endif | |
448 | ||
449 | #ifdef CONFIG_SCHEDSTATS | |
450 | /* latency stats */ | |
451 | struct sched_info rq_sched_info; | |
452 | unsigned long long rq_cpu_time; | |
453 | /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */ | |
454 | ||
455 | /* sys_sched_yield() stats */ | |
456 | unsigned int yld_count; | |
457 | ||
458 | /* schedule() stats */ | |
029632fb PZ |
459 | unsigned int sched_count; |
460 | unsigned int sched_goidle; | |
461 | ||
462 | /* try_to_wake_up() stats */ | |
463 | unsigned int ttwu_count; | |
464 | unsigned int ttwu_local; | |
465 | #endif | |
466 | ||
467 | #ifdef CONFIG_SMP | |
468 | struct llist_head wake_list; | |
469 | #endif | |
470 | }; | |
471 | ||
472 | static inline int cpu_of(struct rq *rq) | |
473 | { | |
474 | #ifdef CONFIG_SMP | |
475 | return rq->cpu; | |
476 | #else | |
477 | return 0; | |
478 | #endif | |
479 | } | |
480 | ||
481 | DECLARE_PER_CPU(struct rq, runqueues); | |
482 | ||
518cd623 PZ |
483 | #define cpu_rq(cpu) (&per_cpu(runqueues, (cpu))) |
484 | #define this_rq() (&__get_cpu_var(runqueues)) | |
485 | #define task_rq(p) cpu_rq(task_cpu(p)) | |
486 | #define cpu_curr(cpu) (cpu_rq(cpu)->curr) | |
487 | #define raw_rq() (&__raw_get_cpu_var(runqueues)) | |
488 | ||
489 | #ifdef CONFIG_SMP | |
490 | ||
029632fb PZ |
491 | #define rcu_dereference_check_sched_domain(p) \ |
492 | rcu_dereference_check((p), \ | |
493 | lockdep_is_held(&sched_domains_mutex)) | |
494 | ||
495 | /* | |
496 | * The domain tree (rq->sd) is protected by RCU's quiescent state transition. | |
497 | * See detach_destroy_domains: synchronize_sched for details. | |
498 | * | |
499 | * The domain tree of any CPU may only be accessed from within | |
500 | * preempt-disabled sections. | |
501 | */ | |
502 | #define for_each_domain(cpu, __sd) \ | |
518cd623 PZ |
503 | for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \ |
504 | __sd; __sd = __sd->parent) | |
029632fb | 505 | |
77e81365 SS |
506 | #define for_each_lower_domain(sd) for (; sd; sd = sd->child) |
507 | ||
518cd623 PZ |
508 | /** |
509 | * highest_flag_domain - Return highest sched_domain containing flag. | |
510 | * @cpu: The cpu whose highest level of sched domain is to | |
511 | * be returned. | |
512 | * @flag: The flag to check for the highest sched_domain | |
513 | * for the given cpu. | |
514 | * | |
515 | * Returns the highest sched_domain of a cpu which contains the given flag. | |
516 | */ | |
517 | static inline struct sched_domain *highest_flag_domain(int cpu, int flag) | |
518 | { | |
519 | struct sched_domain *sd, *hsd = NULL; | |
520 | ||
521 | for_each_domain(cpu, sd) { | |
522 | if (!(sd->flags & flag)) | |
523 | break; | |
524 | hsd = sd; | |
525 | } | |
526 | ||
527 | return hsd; | |
528 | } | |
529 | ||
530 | DECLARE_PER_CPU(struct sched_domain *, sd_llc); | |
531 | DECLARE_PER_CPU(int, sd_llc_id); | |
532 | ||
c1174876 PZ |
533 | extern int group_balance_cpu(struct sched_group *sg); |
534 | ||
518cd623 | 535 | #endif /* CONFIG_SMP */ |
029632fb | 536 | |
391e43da PZ |
537 | #include "stats.h" |
538 | #include "auto_group.h" | |
029632fb PZ |
539 | |
540 | #ifdef CONFIG_CGROUP_SCHED | |
541 | ||
542 | /* | |
543 | * Return the group to which this tasks belongs. | |
544 | * | |
8323f26c PZ |
545 | * We cannot use task_subsys_state() and friends because the cgroup |
546 | * subsystem changes that value before the cgroup_subsys::attach() method | |
547 | * is called, therefore we cannot pin it and might observe the wrong value. | |
548 | * | |
549 | * The same is true for autogroup's p->signal->autogroup->tg, the autogroup | |
550 | * core changes this before calling sched_move_task(). | |
551 | * | |
552 | * Instead we use a 'copy' which is updated from sched_move_task() while | |
553 | * holding both task_struct::pi_lock and rq::lock. | |
029632fb PZ |
554 | */ |
555 | static inline struct task_group *task_group(struct task_struct *p) | |
556 | { | |
8323f26c | 557 | return p->sched_task_group; |
029632fb PZ |
558 | } |
559 | ||
560 | /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */ | |
561 | static inline void set_task_rq(struct task_struct *p, unsigned int cpu) | |
562 | { | |
563 | #if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED) | |
564 | struct task_group *tg = task_group(p); | |
565 | #endif | |
566 | ||
567 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
568 | p->se.cfs_rq = tg->cfs_rq[cpu]; | |
569 | p->se.parent = tg->se[cpu]; | |
570 | #endif | |
571 | ||
572 | #ifdef CONFIG_RT_GROUP_SCHED | |
573 | p->rt.rt_rq = tg->rt_rq[cpu]; | |
574 | p->rt.parent = tg->rt_se[cpu]; | |
575 | #endif | |
576 | } | |
577 | ||
578 | #else /* CONFIG_CGROUP_SCHED */ | |
579 | ||
580 | static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { } | |
581 | static inline struct task_group *task_group(struct task_struct *p) | |
582 | { | |
583 | return NULL; | |
584 | } | |
585 | ||
586 | #endif /* CONFIG_CGROUP_SCHED */ | |
587 | ||
588 | static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu) | |
589 | { | |
590 | set_task_rq(p, cpu); | |
591 | #ifdef CONFIG_SMP | |
592 | /* | |
593 | * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be | |
594 | * successfuly executed on another CPU. We must ensure that updates of | |
595 | * per-task data have been completed by this moment. | |
596 | */ | |
597 | smp_wmb(); | |
598 | task_thread_info(p)->cpu = cpu; | |
599 | #endif | |
600 | } | |
601 | ||
602 | /* | |
603 | * Tunables that become constants when CONFIG_SCHED_DEBUG is off: | |
604 | */ | |
605 | #ifdef CONFIG_SCHED_DEBUG | |
c5905afb | 606 | # include <linux/static_key.h> |
029632fb PZ |
607 | # define const_debug __read_mostly |
608 | #else | |
609 | # define const_debug const | |
610 | #endif | |
611 | ||
612 | extern const_debug unsigned int sysctl_sched_features; | |
613 | ||
614 | #define SCHED_FEAT(name, enabled) \ | |
615 | __SCHED_FEAT_##name , | |
616 | ||
617 | enum { | |
391e43da | 618 | #include "features.h" |
f8b6d1cc | 619 | __SCHED_FEAT_NR, |
029632fb PZ |
620 | }; |
621 | ||
622 | #undef SCHED_FEAT | |
623 | ||
f8b6d1cc | 624 | #if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL) |
c5905afb | 625 | static __always_inline bool static_branch__true(struct static_key *key) |
f8b6d1cc | 626 | { |
c5905afb | 627 | return static_key_true(key); /* Not out of line branch. */ |
f8b6d1cc PZ |
628 | } |
629 | ||
c5905afb | 630 | static __always_inline bool static_branch__false(struct static_key *key) |
f8b6d1cc | 631 | { |
c5905afb | 632 | return static_key_false(key); /* Out of line branch. */ |
f8b6d1cc PZ |
633 | } |
634 | ||
635 | #define SCHED_FEAT(name, enabled) \ | |
c5905afb | 636 | static __always_inline bool static_branch_##name(struct static_key *key) \ |
f8b6d1cc PZ |
637 | { \ |
638 | return static_branch__##enabled(key); \ | |
639 | } | |
640 | ||
641 | #include "features.h" | |
642 | ||
643 | #undef SCHED_FEAT | |
644 | ||
c5905afb | 645 | extern struct static_key sched_feat_keys[__SCHED_FEAT_NR]; |
f8b6d1cc PZ |
646 | #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x])) |
647 | #else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */ | |
029632fb | 648 | #define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) |
f8b6d1cc | 649 | #endif /* SCHED_DEBUG && HAVE_JUMP_LABEL */ |
029632fb PZ |
650 | |
651 | static inline u64 global_rt_period(void) | |
652 | { | |
653 | return (u64)sysctl_sched_rt_period * NSEC_PER_USEC; | |
654 | } | |
655 | ||
656 | static inline u64 global_rt_runtime(void) | |
657 | { | |
658 | if (sysctl_sched_rt_runtime < 0) | |
659 | return RUNTIME_INF; | |
660 | ||
661 | return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC; | |
662 | } | |
663 | ||
664 | ||
665 | ||
666 | static inline int task_current(struct rq *rq, struct task_struct *p) | |
667 | { | |
668 | return rq->curr == p; | |
669 | } | |
670 | ||
671 | static inline int task_running(struct rq *rq, struct task_struct *p) | |
672 | { | |
673 | #ifdef CONFIG_SMP | |
674 | return p->on_cpu; | |
675 | #else | |
676 | return task_current(rq, p); | |
677 | #endif | |
678 | } | |
679 | ||
680 | ||
681 | #ifndef prepare_arch_switch | |
682 | # define prepare_arch_switch(next) do { } while (0) | |
683 | #endif | |
684 | #ifndef finish_arch_switch | |
685 | # define finish_arch_switch(prev) do { } while (0) | |
686 | #endif | |
01f23e16 CM |
687 | #ifndef finish_arch_post_lock_switch |
688 | # define finish_arch_post_lock_switch() do { } while (0) | |
689 | #endif | |
029632fb PZ |
690 | |
691 | #ifndef __ARCH_WANT_UNLOCKED_CTXSW | |
692 | static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next) | |
693 | { | |
694 | #ifdef CONFIG_SMP | |
695 | /* | |
696 | * We can optimise this out completely for !SMP, because the | |
697 | * SMP rebalancing from interrupt is the only thing that cares | |
698 | * here. | |
699 | */ | |
700 | next->on_cpu = 1; | |
701 | #endif | |
702 | } | |
703 | ||
704 | static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) | |
705 | { | |
706 | #ifdef CONFIG_SMP | |
707 | /* | |
708 | * After ->on_cpu is cleared, the task can be moved to a different CPU. | |
709 | * We must ensure this doesn't happen until the switch is completely | |
710 | * finished. | |
711 | */ | |
712 | smp_wmb(); | |
713 | prev->on_cpu = 0; | |
714 | #endif | |
715 | #ifdef CONFIG_DEBUG_SPINLOCK | |
716 | /* this is a valid case when another task releases the spinlock */ | |
717 | rq->lock.owner = current; | |
718 | #endif | |
719 | /* | |
720 | * If we are tracking spinlock dependencies then we have to | |
721 | * fix up the runqueue lock - which gets 'carried over' from | |
722 | * prev into current: | |
723 | */ | |
724 | spin_acquire(&rq->lock.dep_map, 0, 0, _THIS_IP_); | |
725 | ||
726 | raw_spin_unlock_irq(&rq->lock); | |
727 | } | |
728 | ||
729 | #else /* __ARCH_WANT_UNLOCKED_CTXSW */ | |
730 | static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next) | |
731 | { | |
732 | #ifdef CONFIG_SMP | |
733 | /* | |
734 | * We can optimise this out completely for !SMP, because the | |
735 | * SMP rebalancing from interrupt is the only thing that cares | |
736 | * here. | |
737 | */ | |
738 | next->on_cpu = 1; | |
739 | #endif | |
029632fb | 740 | raw_spin_unlock(&rq->lock); |
029632fb PZ |
741 | } |
742 | ||
743 | static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) | |
744 | { | |
745 | #ifdef CONFIG_SMP | |
746 | /* | |
747 | * After ->on_cpu is cleared, the task can be moved to a different CPU. | |
748 | * We must ensure this doesn't happen until the switch is completely | |
749 | * finished. | |
750 | */ | |
751 | smp_wmb(); | |
752 | prev->on_cpu = 0; | |
753 | #endif | |
029632fb | 754 | local_irq_enable(); |
029632fb PZ |
755 | } |
756 | #endif /* __ARCH_WANT_UNLOCKED_CTXSW */ | |
757 | ||
758 | ||
759 | static inline void update_load_add(struct load_weight *lw, unsigned long inc) | |
760 | { | |
761 | lw->weight += inc; | |
762 | lw->inv_weight = 0; | |
763 | } | |
764 | ||
765 | static inline void update_load_sub(struct load_weight *lw, unsigned long dec) | |
766 | { | |
767 | lw->weight -= dec; | |
768 | lw->inv_weight = 0; | |
769 | } | |
770 | ||
771 | static inline void update_load_set(struct load_weight *lw, unsigned long w) | |
772 | { | |
773 | lw->weight = w; | |
774 | lw->inv_weight = 0; | |
775 | } | |
776 | ||
777 | /* | |
778 | * To aid in avoiding the subversion of "niceness" due to uneven distribution | |
779 | * of tasks with abnormal "nice" values across CPUs the contribution that | |
780 | * each task makes to its run queue's load is weighted according to its | |
781 | * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a | |
782 | * scaled version of the new time slice allocation that they receive on time | |
783 | * slice expiry etc. | |
784 | */ | |
785 | ||
786 | #define WEIGHT_IDLEPRIO 3 | |
787 | #define WMULT_IDLEPRIO 1431655765 | |
788 | ||
789 | /* | |
790 | * Nice levels are multiplicative, with a gentle 10% change for every | |
791 | * nice level changed. I.e. when a CPU-bound task goes from nice 0 to | |
792 | * nice 1, it will get ~10% less CPU time than another CPU-bound task | |
793 | * that remained on nice 0. | |
794 | * | |
795 | * The "10% effect" is relative and cumulative: from _any_ nice level, | |
796 | * if you go up 1 level, it's -10% CPU usage, if you go down 1 level | |
797 | * it's +10% CPU usage. (to achieve that we use a multiplier of 1.25. | |
798 | * If a task goes up by ~10% and another task goes down by ~10% then | |
799 | * the relative distance between them is ~25%.) | |
800 | */ | |
801 | static const int prio_to_weight[40] = { | |
802 | /* -20 */ 88761, 71755, 56483, 46273, 36291, | |
803 | /* -15 */ 29154, 23254, 18705, 14949, 11916, | |
804 | /* -10 */ 9548, 7620, 6100, 4904, 3906, | |
805 | /* -5 */ 3121, 2501, 1991, 1586, 1277, | |
806 | /* 0 */ 1024, 820, 655, 526, 423, | |
807 | /* 5 */ 335, 272, 215, 172, 137, | |
808 | /* 10 */ 110, 87, 70, 56, 45, | |
809 | /* 15 */ 36, 29, 23, 18, 15, | |
810 | }; | |
811 | ||
812 | /* | |
813 | * Inverse (2^32/x) values of the prio_to_weight[] array, precalculated. | |
814 | * | |
815 | * In cases where the weight does not change often, we can use the | |
816 | * precalculated inverse to speed up arithmetics by turning divisions | |
817 | * into multiplications: | |
818 | */ | |
819 | static const u32 prio_to_wmult[40] = { | |
820 | /* -20 */ 48388, 59856, 76040, 92818, 118348, | |
821 | /* -15 */ 147320, 184698, 229616, 287308, 360437, | |
822 | /* -10 */ 449829, 563644, 704093, 875809, 1099582, | |
823 | /* -5 */ 1376151, 1717300, 2157191, 2708050, 3363326, | |
824 | /* 0 */ 4194304, 5237765, 6557202, 8165337, 10153587, | |
825 | /* 5 */ 12820798, 15790321, 19976592, 24970740, 31350126, | |
826 | /* 10 */ 39045157, 49367440, 61356676, 76695844, 95443717, | |
827 | /* 15 */ 119304647, 148102320, 186737708, 238609294, 286331153, | |
828 | }; | |
829 | ||
830 | /* Time spent by the tasks of the cpu accounting group executing in ... */ | |
831 | enum cpuacct_stat_index { | |
832 | CPUACCT_STAT_USER, /* ... user mode */ | |
833 | CPUACCT_STAT_SYSTEM, /* ... kernel mode */ | |
834 | ||
835 | CPUACCT_STAT_NSTATS, | |
836 | }; | |
837 | ||
838 | ||
839 | #define sched_class_highest (&stop_sched_class) | |
840 | #define for_each_class(class) \ | |
841 | for (class = sched_class_highest; class; class = class->next) | |
842 | ||
843 | extern const struct sched_class stop_sched_class; | |
844 | extern const struct sched_class rt_sched_class; | |
845 | extern const struct sched_class fair_sched_class; | |
846 | extern const struct sched_class idle_sched_class; | |
847 | ||
848 | ||
849 | #ifdef CONFIG_SMP | |
850 | ||
851 | extern void trigger_load_balance(struct rq *rq, int cpu); | |
852 | extern void idle_balance(int this_cpu, struct rq *this_rq); | |
853 | ||
854 | #else /* CONFIG_SMP */ | |
855 | ||
856 | static inline void idle_balance(int cpu, struct rq *rq) | |
857 | { | |
858 | } | |
859 | ||
860 | #endif | |
861 | ||
862 | extern void sysrq_sched_debug_show(void); | |
863 | extern void sched_init_granularity(void); | |
864 | extern void update_max_interval(void); | |
865 | extern void update_group_power(struct sched_domain *sd, int cpu); | |
866 | extern int update_runtime(struct notifier_block *nfb, unsigned long action, void *hcpu); | |
867 | extern void init_sched_rt_class(void); | |
868 | extern void init_sched_fair_class(void); | |
869 | ||
870 | extern void resched_task(struct task_struct *p); | |
871 | extern void resched_cpu(int cpu); | |
872 | ||
873 | extern struct rt_bandwidth def_rt_bandwidth; | |
874 | extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime); | |
875 | ||
556061b0 | 876 | extern void update_idle_cpu_load(struct rq *this_rq); |
029632fb PZ |
877 | |
878 | #ifdef CONFIG_CGROUP_CPUACCT | |
54c707e9 GC |
879 | #include <linux/cgroup.h> |
880 | /* track cpu usage of a group of tasks and its child groups */ | |
881 | struct cpuacct { | |
882 | struct cgroup_subsys_state css; | |
883 | /* cpuusage holds pointer to a u64-type object on every cpu */ | |
884 | u64 __percpu *cpuusage; | |
885 | struct kernel_cpustat __percpu *cpustat; | |
886 | }; | |
887 | ||
73fbec60 FW |
888 | extern struct cgroup_subsys cpuacct_subsys; |
889 | extern struct cpuacct root_cpuacct; | |
890 | ||
54c707e9 GC |
891 | /* return cpu accounting group corresponding to this container */ |
892 | static inline struct cpuacct *cgroup_ca(struct cgroup *cgrp) | |
893 | { | |
894 | return container_of(cgroup_subsys_state(cgrp, cpuacct_subsys_id), | |
895 | struct cpuacct, css); | |
896 | } | |
897 | ||
898 | /* return cpu accounting group to which this task belongs */ | |
899 | static inline struct cpuacct *task_ca(struct task_struct *tsk) | |
900 | { | |
901 | return container_of(task_subsys_state(tsk, cpuacct_subsys_id), | |
902 | struct cpuacct, css); | |
903 | } | |
904 | ||
905 | static inline struct cpuacct *parent_ca(struct cpuacct *ca) | |
906 | { | |
907 | if (!ca || !ca->css.cgroup->parent) | |
908 | return NULL; | |
909 | return cgroup_ca(ca->css.cgroup->parent); | |
910 | } | |
911 | ||
029632fb | 912 | extern void cpuacct_charge(struct task_struct *tsk, u64 cputime); |
029632fb PZ |
913 | #else |
914 | static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {} | |
029632fb PZ |
915 | #endif |
916 | ||
73fbec60 FW |
917 | #ifdef CONFIG_PARAVIRT |
918 | static inline u64 steal_ticks(u64 steal) | |
919 | { | |
920 | if (unlikely(steal > NSEC_PER_SEC)) | |
921 | return div_u64(steal, TICK_NSEC); | |
922 | ||
923 | return __iter_div_u64_rem(steal, TICK_NSEC, &steal); | |
924 | } | |
925 | #endif | |
926 | ||
029632fb PZ |
927 | static inline void inc_nr_running(struct rq *rq) |
928 | { | |
929 | rq->nr_running++; | |
930 | } | |
931 | ||
932 | static inline void dec_nr_running(struct rq *rq) | |
933 | { | |
934 | rq->nr_running--; | |
935 | } | |
936 | ||
937 | extern void update_rq_clock(struct rq *rq); | |
938 | ||
939 | extern void activate_task(struct rq *rq, struct task_struct *p, int flags); | |
940 | extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags); | |
941 | ||
942 | extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags); | |
943 | ||
944 | extern const_debug unsigned int sysctl_sched_time_avg; | |
945 | extern const_debug unsigned int sysctl_sched_nr_migrate; | |
946 | extern const_debug unsigned int sysctl_sched_migration_cost; | |
947 | ||
948 | static inline u64 sched_avg_period(void) | |
949 | { | |
950 | return (u64)sysctl_sched_time_avg * NSEC_PER_MSEC / 2; | |
951 | } | |
952 | ||
029632fb PZ |
953 | #ifdef CONFIG_SCHED_HRTICK |
954 | ||
955 | /* | |
956 | * Use hrtick when: | |
957 | * - enabled by features | |
958 | * - hrtimer is actually high res | |
959 | */ | |
960 | static inline int hrtick_enabled(struct rq *rq) | |
961 | { | |
962 | if (!sched_feat(HRTICK)) | |
963 | return 0; | |
964 | if (!cpu_active(cpu_of(rq))) | |
965 | return 0; | |
966 | return hrtimer_is_hres_active(&rq->hrtick_timer); | |
967 | } | |
968 | ||
969 | void hrtick_start(struct rq *rq, u64 delay); | |
970 | ||
b39e66ea MG |
971 | #else |
972 | ||
973 | static inline int hrtick_enabled(struct rq *rq) | |
974 | { | |
975 | return 0; | |
976 | } | |
977 | ||
029632fb PZ |
978 | #endif /* CONFIG_SCHED_HRTICK */ |
979 | ||
980 | #ifdef CONFIG_SMP | |
981 | extern void sched_avg_update(struct rq *rq); | |
982 | static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) | |
983 | { | |
984 | rq->rt_avg += rt_delta; | |
985 | sched_avg_update(rq); | |
986 | } | |
987 | #else | |
988 | static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { } | |
989 | static inline void sched_avg_update(struct rq *rq) { } | |
990 | #endif | |
991 | ||
992 | extern void start_bandwidth_timer(struct hrtimer *period_timer, ktime_t period); | |
993 | ||
994 | #ifdef CONFIG_SMP | |
995 | #ifdef CONFIG_PREEMPT | |
996 | ||
997 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2); | |
998 | ||
999 | /* | |
1000 | * fair double_lock_balance: Safely acquires both rq->locks in a fair | |
1001 | * way at the expense of forcing extra atomic operations in all | |
1002 | * invocations. This assures that the double_lock is acquired using the | |
1003 | * same underlying policy as the spinlock_t on this architecture, which | |
1004 | * reduces latency compared to the unfair variant below. However, it | |
1005 | * also adds more overhead and therefore may reduce throughput. | |
1006 | */ | |
1007 | static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
1008 | __releases(this_rq->lock) | |
1009 | __acquires(busiest->lock) | |
1010 | __acquires(this_rq->lock) | |
1011 | { | |
1012 | raw_spin_unlock(&this_rq->lock); | |
1013 | double_rq_lock(this_rq, busiest); | |
1014 | ||
1015 | return 1; | |
1016 | } | |
1017 | ||
1018 | #else | |
1019 | /* | |
1020 | * Unfair double_lock_balance: Optimizes throughput at the expense of | |
1021 | * latency by eliminating extra atomic operations when the locks are | |
1022 | * already in proper order on entry. This favors lower cpu-ids and will | |
1023 | * grant the double lock to lower cpus over higher ids under contention, | |
1024 | * regardless of entry order into the function. | |
1025 | */ | |
1026 | static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
1027 | __releases(this_rq->lock) | |
1028 | __acquires(busiest->lock) | |
1029 | __acquires(this_rq->lock) | |
1030 | { | |
1031 | int ret = 0; | |
1032 | ||
1033 | if (unlikely(!raw_spin_trylock(&busiest->lock))) { | |
1034 | if (busiest < this_rq) { | |
1035 | raw_spin_unlock(&this_rq->lock); | |
1036 | raw_spin_lock(&busiest->lock); | |
1037 | raw_spin_lock_nested(&this_rq->lock, | |
1038 | SINGLE_DEPTH_NESTING); | |
1039 | ret = 1; | |
1040 | } else | |
1041 | raw_spin_lock_nested(&busiest->lock, | |
1042 | SINGLE_DEPTH_NESTING); | |
1043 | } | |
1044 | return ret; | |
1045 | } | |
1046 | ||
1047 | #endif /* CONFIG_PREEMPT */ | |
1048 | ||
1049 | /* | |
1050 | * double_lock_balance - lock the busiest runqueue, this_rq is locked already. | |
1051 | */ | |
1052 | static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
1053 | { | |
1054 | if (unlikely(!irqs_disabled())) { | |
1055 | /* printk() doesn't work good under rq->lock */ | |
1056 | raw_spin_unlock(&this_rq->lock); | |
1057 | BUG_ON(1); | |
1058 | } | |
1059 | ||
1060 | return _double_lock_balance(this_rq, busiest); | |
1061 | } | |
1062 | ||
1063 | static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest) | |
1064 | __releases(busiest->lock) | |
1065 | { | |
1066 | raw_spin_unlock(&busiest->lock); | |
1067 | lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_); | |
1068 | } | |
1069 | ||
1070 | /* | |
1071 | * double_rq_lock - safely lock two runqueues | |
1072 | * | |
1073 | * Note this does not disable interrupts like task_rq_lock, | |
1074 | * you need to do so manually before calling. | |
1075 | */ | |
1076 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) | |
1077 | __acquires(rq1->lock) | |
1078 | __acquires(rq2->lock) | |
1079 | { | |
1080 | BUG_ON(!irqs_disabled()); | |
1081 | if (rq1 == rq2) { | |
1082 | raw_spin_lock(&rq1->lock); | |
1083 | __acquire(rq2->lock); /* Fake it out ;) */ | |
1084 | } else { | |
1085 | if (rq1 < rq2) { | |
1086 | raw_spin_lock(&rq1->lock); | |
1087 | raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING); | |
1088 | } else { | |
1089 | raw_spin_lock(&rq2->lock); | |
1090 | raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING); | |
1091 | } | |
1092 | } | |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * double_rq_unlock - safely unlock two runqueues | |
1097 | * | |
1098 | * Note this does not restore interrupts like task_rq_unlock, | |
1099 | * you need to do so manually after calling. | |
1100 | */ | |
1101 | static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) | |
1102 | __releases(rq1->lock) | |
1103 | __releases(rq2->lock) | |
1104 | { | |
1105 | raw_spin_unlock(&rq1->lock); | |
1106 | if (rq1 != rq2) | |
1107 | raw_spin_unlock(&rq2->lock); | |
1108 | else | |
1109 | __release(rq2->lock); | |
1110 | } | |
1111 | ||
1112 | #else /* CONFIG_SMP */ | |
1113 | ||
1114 | /* | |
1115 | * double_rq_lock - safely lock two runqueues | |
1116 | * | |
1117 | * Note this does not disable interrupts like task_rq_lock, | |
1118 | * you need to do so manually before calling. | |
1119 | */ | |
1120 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) | |
1121 | __acquires(rq1->lock) | |
1122 | __acquires(rq2->lock) | |
1123 | { | |
1124 | BUG_ON(!irqs_disabled()); | |
1125 | BUG_ON(rq1 != rq2); | |
1126 | raw_spin_lock(&rq1->lock); | |
1127 | __acquire(rq2->lock); /* Fake it out ;) */ | |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * double_rq_unlock - safely unlock two runqueues | |
1132 | * | |
1133 | * Note this does not restore interrupts like task_rq_unlock, | |
1134 | * you need to do so manually after calling. | |
1135 | */ | |
1136 | static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) | |
1137 | __releases(rq1->lock) | |
1138 | __releases(rq2->lock) | |
1139 | { | |
1140 | BUG_ON(rq1 != rq2); | |
1141 | raw_spin_unlock(&rq1->lock); | |
1142 | __release(rq2->lock); | |
1143 | } | |
1144 | ||
1145 | #endif | |
1146 | ||
1147 | extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq); | |
1148 | extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq); | |
1149 | extern void print_cfs_stats(struct seq_file *m, int cpu); | |
1150 | extern void print_rt_stats(struct seq_file *m, int cpu); | |
1151 | ||
1152 | extern void init_cfs_rq(struct cfs_rq *cfs_rq); | |
1153 | extern void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq); | |
029632fb PZ |
1154 | |
1155 | extern void account_cfs_bandwidth_used(int enabled, int was_enabled); | |
1c792db7 SS |
1156 | |
1157 | #ifdef CONFIG_NO_HZ | |
1158 | enum rq_nohz_flag_bits { | |
1159 | NOHZ_TICK_STOPPED, | |
1160 | NOHZ_BALANCE_KICK, | |
69e1e811 | 1161 | NOHZ_IDLE, |
1c792db7 SS |
1162 | }; |
1163 | ||
1164 | #define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags) | |
1165 | #endif | |
73fbec60 FW |
1166 | |
1167 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING | |
1168 | ||
1169 | DECLARE_PER_CPU(u64, cpu_hardirq_time); | |
1170 | DECLARE_PER_CPU(u64, cpu_softirq_time); | |
1171 | ||
1172 | #ifndef CONFIG_64BIT | |
1173 | DECLARE_PER_CPU(seqcount_t, irq_time_seq); | |
1174 | ||
1175 | static inline void irq_time_write_begin(void) | |
1176 | { | |
1177 | __this_cpu_inc(irq_time_seq.sequence); | |
1178 | smp_wmb(); | |
1179 | } | |
1180 | ||
1181 | static inline void irq_time_write_end(void) | |
1182 | { | |
1183 | smp_wmb(); | |
1184 | __this_cpu_inc(irq_time_seq.sequence); | |
1185 | } | |
1186 | ||
1187 | static inline u64 irq_time_read(int cpu) | |
1188 | { | |
1189 | u64 irq_time; | |
1190 | unsigned seq; | |
1191 | ||
1192 | do { | |
1193 | seq = read_seqcount_begin(&per_cpu(irq_time_seq, cpu)); | |
1194 | irq_time = per_cpu(cpu_softirq_time, cpu) + | |
1195 | per_cpu(cpu_hardirq_time, cpu); | |
1196 | } while (read_seqcount_retry(&per_cpu(irq_time_seq, cpu), seq)); | |
1197 | ||
1198 | return irq_time; | |
1199 | } | |
1200 | #else /* CONFIG_64BIT */ | |
1201 | static inline void irq_time_write_begin(void) | |
1202 | { | |
1203 | } | |
1204 | ||
1205 | static inline void irq_time_write_end(void) | |
1206 | { | |
1207 | } | |
1208 | ||
1209 | static inline u64 irq_time_read(int cpu) | |
1210 | { | |
1211 | return per_cpu(cpu_softirq_time, cpu) + per_cpu(cpu_hardirq_time, cpu); | |
1212 | } | |
1213 | #endif /* CONFIG_64BIT */ | |
1214 | #endif /* CONFIG_IRQ_TIME_ACCOUNTING */ | |
1215 |