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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; | |
c566e8e9 | 115 | atomic64_t load_avg; |
bb17f655 | 116 | atomic_t runnable_avg; |
029632fb PZ |
117 | #endif |
118 | ||
119 | #ifdef CONFIG_RT_GROUP_SCHED | |
120 | struct sched_rt_entity **rt_se; | |
121 | struct rt_rq **rt_rq; | |
122 | ||
123 | struct rt_bandwidth rt_bandwidth; | |
124 | #endif | |
125 | ||
126 | struct rcu_head rcu; | |
127 | struct list_head list; | |
128 | ||
129 | struct task_group *parent; | |
130 | struct list_head siblings; | |
131 | struct list_head children; | |
132 | ||
133 | #ifdef CONFIG_SCHED_AUTOGROUP | |
134 | struct autogroup *autogroup; | |
135 | #endif | |
136 | ||
137 | struct cfs_bandwidth cfs_bandwidth; | |
138 | }; | |
139 | ||
140 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
141 | #define ROOT_TASK_GROUP_LOAD NICE_0_LOAD | |
142 | ||
143 | /* | |
144 | * A weight of 0 or 1 can cause arithmetics problems. | |
145 | * A weight of a cfs_rq is the sum of weights of which entities | |
146 | * are queued on this cfs_rq, so a weight of a entity should not be | |
147 | * too large, so as the shares value of a task group. | |
148 | * (The default weight is 1024 - so there's no practical | |
149 | * limitation from this.) | |
150 | */ | |
151 | #define MIN_SHARES (1UL << 1) | |
152 | #define MAX_SHARES (1UL << 18) | |
153 | #endif | |
154 | ||
155 | /* Default task group. | |
156 | * Every task in system belong to this group at bootup. | |
157 | */ | |
158 | extern struct task_group root_task_group; | |
159 | ||
160 | typedef int (*tg_visitor)(struct task_group *, void *); | |
161 | ||
162 | extern int walk_tg_tree_from(struct task_group *from, | |
163 | tg_visitor down, tg_visitor up, void *data); | |
164 | ||
165 | /* | |
166 | * Iterate the full tree, calling @down when first entering a node and @up when | |
167 | * leaving it for the final time. | |
168 | * | |
169 | * Caller must hold rcu_lock or sufficient equivalent. | |
170 | */ | |
171 | static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data) | |
172 | { | |
173 | return walk_tg_tree_from(&root_task_group, down, up, data); | |
174 | } | |
175 | ||
176 | extern int tg_nop(struct task_group *tg, void *data); | |
177 | ||
178 | extern void free_fair_sched_group(struct task_group *tg); | |
179 | extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent); | |
180 | extern void unregister_fair_sched_group(struct task_group *tg, int cpu); | |
181 | extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq, | |
182 | struct sched_entity *se, int cpu, | |
183 | struct sched_entity *parent); | |
184 | extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b); | |
185 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); | |
186 | ||
187 | extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b); | |
188 | extern void __start_cfs_bandwidth(struct cfs_bandwidth *cfs_b); | |
189 | extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq); | |
190 | ||
191 | extern void free_rt_sched_group(struct task_group *tg); | |
192 | extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent); | |
193 | extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq, | |
194 | struct sched_rt_entity *rt_se, int cpu, | |
195 | struct sched_rt_entity *parent); | |
196 | ||
197 | #else /* CONFIG_CGROUP_SCHED */ | |
198 | ||
199 | struct cfs_bandwidth { }; | |
200 | ||
201 | #endif /* CONFIG_CGROUP_SCHED */ | |
202 | ||
203 | /* CFS-related fields in a runqueue */ | |
204 | struct cfs_rq { | |
205 | struct load_weight load; | |
c82513e5 | 206 | unsigned int nr_running, h_nr_running; |
029632fb PZ |
207 | |
208 | u64 exec_clock; | |
209 | u64 min_vruntime; | |
210 | #ifndef CONFIG_64BIT | |
211 | u64 min_vruntime_copy; | |
212 | #endif | |
213 | ||
214 | struct rb_root tasks_timeline; | |
215 | struct rb_node *rb_leftmost; | |
216 | ||
029632fb PZ |
217 | /* |
218 | * 'curr' points to currently running entity on this cfs_rq. | |
219 | * It is set to NULL otherwise (i.e when none are currently running). | |
220 | */ | |
221 | struct sched_entity *curr, *next, *last, *skip; | |
222 | ||
223 | #ifdef CONFIG_SCHED_DEBUG | |
224 | unsigned int nr_spread_over; | |
225 | #endif | |
226 | ||
2dac754e | 227 | #ifdef CONFIG_SMP |
f4e26b12 PT |
228 | /* |
229 | * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be | |
230 | * removed when useful for applications beyond shares distribution (e.g. | |
231 | * load-balance). | |
232 | */ | |
233 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
2dac754e PT |
234 | /* |
235 | * CFS Load tracking | |
236 | * Under CFS, load is tracked on a per-entity basis and aggregated up. | |
237 | * This allows for the description of both thread and group usage (in | |
238 | * the FAIR_GROUP_SCHED case). | |
239 | */ | |
9ee474f5 | 240 | u64 runnable_load_avg, blocked_load_avg; |
aff3e498 | 241 | atomic64_t decay_counter, removed_load; |
9ee474f5 | 242 | u64 last_decay; |
f4e26b12 PT |
243 | #endif /* CONFIG_FAIR_GROUP_SCHED */ |
244 | /* These always depend on CONFIG_FAIR_GROUP_SCHED */ | |
c566e8e9 | 245 | #ifdef CONFIG_FAIR_GROUP_SCHED |
bb17f655 | 246 | u32 tg_runnable_contrib; |
c566e8e9 | 247 | u64 tg_load_contrib; |
82958366 PT |
248 | #endif /* CONFIG_FAIR_GROUP_SCHED */ |
249 | ||
250 | /* | |
251 | * h_load = weight * f(tg) | |
252 | * | |
253 | * Where f(tg) is the recursive weight fraction assigned to | |
254 | * this group. | |
255 | */ | |
256 | unsigned long h_load; | |
257 | #endif /* CONFIG_SMP */ | |
258 | ||
029632fb PZ |
259 | #ifdef CONFIG_FAIR_GROUP_SCHED |
260 | struct rq *rq; /* cpu runqueue to which this cfs_rq is attached */ | |
261 | ||
262 | /* | |
263 | * leaf cfs_rqs are those that hold tasks (lowest schedulable entity in | |
264 | * a hierarchy). Non-leaf lrqs hold other higher schedulable entities | |
265 | * (like users, containers etc.) | |
266 | * | |
267 | * leaf_cfs_rq_list ties together list of leaf cfs_rq's in a cpu. This | |
268 | * list is used during load balance. | |
269 | */ | |
270 | int on_list; | |
271 | struct list_head leaf_cfs_rq_list; | |
272 | struct task_group *tg; /* group that "owns" this runqueue */ | |
273 | ||
029632fb PZ |
274 | #ifdef CONFIG_CFS_BANDWIDTH |
275 | int runtime_enabled; | |
276 | u64 runtime_expires; | |
277 | s64 runtime_remaining; | |
278 | ||
f1b17280 PT |
279 | u64 throttled_clock, throttled_clock_task; |
280 | u64 throttled_clock_task_time; | |
029632fb PZ |
281 | int throttled, throttle_count; |
282 | struct list_head throttled_list; | |
283 | #endif /* CONFIG_CFS_BANDWIDTH */ | |
284 | #endif /* CONFIG_FAIR_GROUP_SCHED */ | |
285 | }; | |
286 | ||
287 | static inline int rt_bandwidth_enabled(void) | |
288 | { | |
289 | return sysctl_sched_rt_runtime >= 0; | |
290 | } | |
291 | ||
292 | /* Real-Time classes' related field in a runqueue: */ | |
293 | struct rt_rq { | |
294 | struct rt_prio_array active; | |
c82513e5 | 295 | unsigned int rt_nr_running; |
029632fb PZ |
296 | #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED |
297 | struct { | |
298 | int curr; /* highest queued rt task prio */ | |
299 | #ifdef CONFIG_SMP | |
300 | int next; /* next highest */ | |
301 | #endif | |
302 | } highest_prio; | |
303 | #endif | |
304 | #ifdef CONFIG_SMP | |
305 | unsigned long rt_nr_migratory; | |
306 | unsigned long rt_nr_total; | |
307 | int overloaded; | |
308 | struct plist_head pushable_tasks; | |
309 | #endif | |
310 | int rt_throttled; | |
311 | u64 rt_time; | |
312 | u64 rt_runtime; | |
313 | /* Nests inside the rq lock: */ | |
314 | raw_spinlock_t rt_runtime_lock; | |
315 | ||
316 | #ifdef CONFIG_RT_GROUP_SCHED | |
317 | unsigned long rt_nr_boosted; | |
318 | ||
319 | struct rq *rq; | |
320 | struct list_head leaf_rt_rq_list; | |
321 | struct task_group *tg; | |
322 | #endif | |
323 | }; | |
324 | ||
325 | #ifdef CONFIG_SMP | |
326 | ||
327 | /* | |
328 | * We add the notion of a root-domain which will be used to define per-domain | |
329 | * variables. Each exclusive cpuset essentially defines an island domain by | |
330 | * fully partitioning the member cpus from any other cpuset. Whenever a new | |
331 | * exclusive cpuset is created, we also create and attach a new root-domain | |
332 | * object. | |
333 | * | |
334 | */ | |
335 | struct root_domain { | |
336 | atomic_t refcount; | |
337 | atomic_t rto_count; | |
338 | struct rcu_head rcu; | |
339 | cpumask_var_t span; | |
340 | cpumask_var_t online; | |
341 | ||
342 | /* | |
343 | * The "RT overload" flag: it gets set if a CPU has more than | |
344 | * one runnable RT task. | |
345 | */ | |
346 | cpumask_var_t rto_mask; | |
347 | struct cpupri cpupri; | |
348 | }; | |
349 | ||
350 | extern struct root_domain def_root_domain; | |
351 | ||
352 | #endif /* CONFIG_SMP */ | |
353 | ||
354 | /* | |
355 | * This is the main, per-CPU runqueue data structure. | |
356 | * | |
357 | * Locking rule: those places that want to lock multiple runqueues | |
358 | * (such as the load balancing or the thread migration code), lock | |
359 | * acquire operations must be ordered by ascending &runqueue. | |
360 | */ | |
361 | struct rq { | |
362 | /* runqueue lock: */ | |
363 | raw_spinlock_t lock; | |
364 | ||
365 | /* | |
366 | * nr_running and cpu_load should be in the same cacheline because | |
367 | * remote CPUs use both these fields when doing load calculation. | |
368 | */ | |
c82513e5 | 369 | unsigned int nr_running; |
029632fb PZ |
370 | #define CPU_LOAD_IDX_MAX 5 |
371 | unsigned long cpu_load[CPU_LOAD_IDX_MAX]; | |
372 | unsigned long last_load_update_tick; | |
373 | #ifdef CONFIG_NO_HZ | |
374 | u64 nohz_stamp; | |
1c792db7 | 375 | unsigned long nohz_flags; |
029632fb PZ |
376 | #endif |
377 | int skip_clock_update; | |
378 | ||
379 | /* capture load from *all* tasks on this cpu: */ | |
380 | struct load_weight load; | |
381 | unsigned long nr_load_updates; | |
382 | u64 nr_switches; | |
383 | ||
384 | struct cfs_rq cfs; | |
385 | struct rt_rq rt; | |
386 | ||
387 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
388 | /* list of leaf cfs_rq on this cpu: */ | |
389 | struct list_head leaf_cfs_rq_list; | |
a35b6466 PZ |
390 | #ifdef CONFIG_SMP |
391 | unsigned long h_load_throttle; | |
392 | #endif /* CONFIG_SMP */ | |
393 | #endif /* CONFIG_FAIR_GROUP_SCHED */ | |
394 | ||
029632fb PZ |
395 | #ifdef CONFIG_RT_GROUP_SCHED |
396 | struct list_head leaf_rt_rq_list; | |
397 | #endif | |
398 | ||
399 | /* | |
400 | * This is part of a global counter where only the total sum | |
401 | * over all CPUs matters. A task can increase this counter on | |
402 | * one CPU and if it got migrated afterwards it may decrease | |
403 | * it on another CPU. Always updated under the runqueue lock: | |
404 | */ | |
405 | unsigned long nr_uninterruptible; | |
406 | ||
407 | struct task_struct *curr, *idle, *stop; | |
408 | unsigned long next_balance; | |
409 | struct mm_struct *prev_mm; | |
410 | ||
411 | u64 clock; | |
412 | u64 clock_task; | |
413 | ||
414 | atomic_t nr_iowait; | |
415 | ||
416 | #ifdef CONFIG_SMP | |
417 | struct root_domain *rd; | |
418 | struct sched_domain *sd; | |
419 | ||
420 | unsigned long cpu_power; | |
421 | ||
422 | unsigned char idle_balance; | |
423 | /* For active balancing */ | |
424 | int post_schedule; | |
425 | int active_balance; | |
426 | int push_cpu; | |
427 | struct cpu_stop_work active_balance_work; | |
428 | /* cpu of this runqueue: */ | |
429 | int cpu; | |
430 | int online; | |
431 | ||
367456c7 PZ |
432 | struct list_head cfs_tasks; |
433 | ||
029632fb PZ |
434 | u64 rt_avg; |
435 | u64 age_stamp; | |
436 | u64 idle_stamp; | |
437 | u64 avg_idle; | |
438 | #endif | |
439 | ||
440 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING | |
441 | u64 prev_irq_time; | |
442 | #endif | |
443 | #ifdef CONFIG_PARAVIRT | |
444 | u64 prev_steal_time; | |
445 | #endif | |
446 | #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING | |
447 | u64 prev_steal_time_rq; | |
448 | #endif | |
449 | ||
450 | /* calc_load related fields */ | |
451 | unsigned long calc_load_update; | |
452 | long calc_load_active; | |
453 | ||
454 | #ifdef CONFIG_SCHED_HRTICK | |
455 | #ifdef CONFIG_SMP | |
456 | int hrtick_csd_pending; | |
457 | struct call_single_data hrtick_csd; | |
458 | #endif | |
459 | struct hrtimer hrtick_timer; | |
460 | #endif | |
461 | ||
462 | #ifdef CONFIG_SCHEDSTATS | |
463 | /* latency stats */ | |
464 | struct sched_info rq_sched_info; | |
465 | unsigned long long rq_cpu_time; | |
466 | /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */ | |
467 | ||
468 | /* sys_sched_yield() stats */ | |
469 | unsigned int yld_count; | |
470 | ||
471 | /* schedule() stats */ | |
029632fb PZ |
472 | unsigned int sched_count; |
473 | unsigned int sched_goidle; | |
474 | ||
475 | /* try_to_wake_up() stats */ | |
476 | unsigned int ttwu_count; | |
477 | unsigned int ttwu_local; | |
478 | #endif | |
479 | ||
480 | #ifdef CONFIG_SMP | |
481 | struct llist_head wake_list; | |
482 | #endif | |
18bf2805 BS |
483 | |
484 | struct sched_avg avg; | |
029632fb PZ |
485 | }; |
486 | ||
487 | static inline int cpu_of(struct rq *rq) | |
488 | { | |
489 | #ifdef CONFIG_SMP | |
490 | return rq->cpu; | |
491 | #else | |
492 | return 0; | |
493 | #endif | |
494 | } | |
495 | ||
496 | DECLARE_PER_CPU(struct rq, runqueues); | |
497 | ||
518cd623 PZ |
498 | #define cpu_rq(cpu) (&per_cpu(runqueues, (cpu))) |
499 | #define this_rq() (&__get_cpu_var(runqueues)) | |
500 | #define task_rq(p) cpu_rq(task_cpu(p)) | |
501 | #define cpu_curr(cpu) (cpu_rq(cpu)->curr) | |
502 | #define raw_rq() (&__raw_get_cpu_var(runqueues)) | |
503 | ||
504 | #ifdef CONFIG_SMP | |
505 | ||
029632fb PZ |
506 | #define rcu_dereference_check_sched_domain(p) \ |
507 | rcu_dereference_check((p), \ | |
508 | lockdep_is_held(&sched_domains_mutex)) | |
509 | ||
510 | /* | |
511 | * The domain tree (rq->sd) is protected by RCU's quiescent state transition. | |
512 | * See detach_destroy_domains: synchronize_sched for details. | |
513 | * | |
514 | * The domain tree of any CPU may only be accessed from within | |
515 | * preempt-disabled sections. | |
516 | */ | |
517 | #define for_each_domain(cpu, __sd) \ | |
518cd623 PZ |
518 | for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \ |
519 | __sd; __sd = __sd->parent) | |
029632fb | 520 | |
77e81365 SS |
521 | #define for_each_lower_domain(sd) for (; sd; sd = sd->child) |
522 | ||
518cd623 PZ |
523 | /** |
524 | * highest_flag_domain - Return highest sched_domain containing flag. | |
525 | * @cpu: The cpu whose highest level of sched domain is to | |
526 | * be returned. | |
527 | * @flag: The flag to check for the highest sched_domain | |
528 | * for the given cpu. | |
529 | * | |
530 | * Returns the highest sched_domain of a cpu which contains the given flag. | |
531 | */ | |
532 | static inline struct sched_domain *highest_flag_domain(int cpu, int flag) | |
533 | { | |
534 | struct sched_domain *sd, *hsd = NULL; | |
535 | ||
536 | for_each_domain(cpu, sd) { | |
537 | if (!(sd->flags & flag)) | |
538 | break; | |
539 | hsd = sd; | |
540 | } | |
541 | ||
542 | return hsd; | |
543 | } | |
544 | ||
545 | DECLARE_PER_CPU(struct sched_domain *, sd_llc); | |
546 | DECLARE_PER_CPU(int, sd_llc_id); | |
547 | ||
c1174876 PZ |
548 | extern int group_balance_cpu(struct sched_group *sg); |
549 | ||
518cd623 | 550 | #endif /* CONFIG_SMP */ |
029632fb | 551 | |
391e43da PZ |
552 | #include "stats.h" |
553 | #include "auto_group.h" | |
029632fb PZ |
554 | |
555 | #ifdef CONFIG_CGROUP_SCHED | |
556 | ||
557 | /* | |
558 | * Return the group to which this tasks belongs. | |
559 | * | |
8323f26c PZ |
560 | * We cannot use task_subsys_state() and friends because the cgroup |
561 | * subsystem changes that value before the cgroup_subsys::attach() method | |
562 | * is called, therefore we cannot pin it and might observe the wrong value. | |
563 | * | |
564 | * The same is true for autogroup's p->signal->autogroup->tg, the autogroup | |
565 | * core changes this before calling sched_move_task(). | |
566 | * | |
567 | * Instead we use a 'copy' which is updated from sched_move_task() while | |
568 | * holding both task_struct::pi_lock and rq::lock. | |
029632fb PZ |
569 | */ |
570 | static inline struct task_group *task_group(struct task_struct *p) | |
571 | { | |
8323f26c | 572 | return p->sched_task_group; |
029632fb PZ |
573 | } |
574 | ||
575 | /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */ | |
576 | static inline void set_task_rq(struct task_struct *p, unsigned int cpu) | |
577 | { | |
578 | #if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED) | |
579 | struct task_group *tg = task_group(p); | |
580 | #endif | |
581 | ||
582 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
583 | p->se.cfs_rq = tg->cfs_rq[cpu]; | |
584 | p->se.parent = tg->se[cpu]; | |
585 | #endif | |
586 | ||
587 | #ifdef CONFIG_RT_GROUP_SCHED | |
588 | p->rt.rt_rq = tg->rt_rq[cpu]; | |
589 | p->rt.parent = tg->rt_se[cpu]; | |
590 | #endif | |
591 | } | |
592 | ||
593 | #else /* CONFIG_CGROUP_SCHED */ | |
594 | ||
595 | static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { } | |
596 | static inline struct task_group *task_group(struct task_struct *p) | |
597 | { | |
598 | return NULL; | |
599 | } | |
600 | ||
601 | #endif /* CONFIG_CGROUP_SCHED */ | |
602 | ||
603 | static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu) | |
604 | { | |
605 | set_task_rq(p, cpu); | |
606 | #ifdef CONFIG_SMP | |
607 | /* | |
608 | * After ->cpu is set up to a new value, task_rq_lock(p, ...) can be | |
609 | * successfuly executed on another CPU. We must ensure that updates of | |
610 | * per-task data have been completed by this moment. | |
611 | */ | |
612 | smp_wmb(); | |
613 | task_thread_info(p)->cpu = cpu; | |
614 | #endif | |
615 | } | |
616 | ||
617 | /* | |
618 | * Tunables that become constants when CONFIG_SCHED_DEBUG is off: | |
619 | */ | |
620 | #ifdef CONFIG_SCHED_DEBUG | |
c5905afb | 621 | # include <linux/static_key.h> |
029632fb PZ |
622 | # define const_debug __read_mostly |
623 | #else | |
624 | # define const_debug const | |
625 | #endif | |
626 | ||
627 | extern const_debug unsigned int sysctl_sched_features; | |
628 | ||
629 | #define SCHED_FEAT(name, enabled) \ | |
630 | __SCHED_FEAT_##name , | |
631 | ||
632 | enum { | |
391e43da | 633 | #include "features.h" |
f8b6d1cc | 634 | __SCHED_FEAT_NR, |
029632fb PZ |
635 | }; |
636 | ||
637 | #undef SCHED_FEAT | |
638 | ||
f8b6d1cc | 639 | #if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL) |
c5905afb | 640 | static __always_inline bool static_branch__true(struct static_key *key) |
f8b6d1cc | 641 | { |
c5905afb | 642 | return static_key_true(key); /* Not out of line branch. */ |
f8b6d1cc PZ |
643 | } |
644 | ||
c5905afb | 645 | static __always_inline bool static_branch__false(struct static_key *key) |
f8b6d1cc | 646 | { |
c5905afb | 647 | return static_key_false(key); /* Out of line branch. */ |
f8b6d1cc PZ |
648 | } |
649 | ||
650 | #define SCHED_FEAT(name, enabled) \ | |
c5905afb | 651 | static __always_inline bool static_branch_##name(struct static_key *key) \ |
f8b6d1cc PZ |
652 | { \ |
653 | return static_branch__##enabled(key); \ | |
654 | } | |
655 | ||
656 | #include "features.h" | |
657 | ||
658 | #undef SCHED_FEAT | |
659 | ||
c5905afb | 660 | extern struct static_key sched_feat_keys[__SCHED_FEAT_NR]; |
f8b6d1cc PZ |
661 | #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x])) |
662 | #else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */ | |
029632fb | 663 | #define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) |
f8b6d1cc | 664 | #endif /* SCHED_DEBUG && HAVE_JUMP_LABEL */ |
029632fb | 665 | |
cbee9f88 PZ |
666 | #ifdef CONFIG_NUMA_BALANCING |
667 | #define sched_feat_numa(x) sched_feat(x) | |
3105b86a MG |
668 | #ifdef CONFIG_SCHED_DEBUG |
669 | #define numabalancing_enabled sched_feat_numa(NUMA) | |
670 | #else | |
671 | extern bool numabalancing_enabled; | |
672 | #endif /* CONFIG_SCHED_DEBUG */ | |
cbee9f88 PZ |
673 | #else |
674 | #define sched_feat_numa(x) (0) | |
3105b86a MG |
675 | #define numabalancing_enabled (0) |
676 | #endif /* CONFIG_NUMA_BALANCING */ | |
cbee9f88 | 677 | |
029632fb PZ |
678 | static inline u64 global_rt_period(void) |
679 | { | |
680 | return (u64)sysctl_sched_rt_period * NSEC_PER_USEC; | |
681 | } | |
682 | ||
683 | static inline u64 global_rt_runtime(void) | |
684 | { | |
685 | if (sysctl_sched_rt_runtime < 0) | |
686 | return RUNTIME_INF; | |
687 | ||
688 | return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC; | |
689 | } | |
690 | ||
691 | ||
692 | ||
693 | static inline int task_current(struct rq *rq, struct task_struct *p) | |
694 | { | |
695 | return rq->curr == p; | |
696 | } | |
697 | ||
698 | static inline int task_running(struct rq *rq, struct task_struct *p) | |
699 | { | |
700 | #ifdef CONFIG_SMP | |
701 | return p->on_cpu; | |
702 | #else | |
703 | return task_current(rq, p); | |
704 | #endif | |
705 | } | |
706 | ||
707 | ||
708 | #ifndef prepare_arch_switch | |
709 | # define prepare_arch_switch(next) do { } while (0) | |
710 | #endif | |
711 | #ifndef finish_arch_switch | |
712 | # define finish_arch_switch(prev) do { } while (0) | |
713 | #endif | |
01f23e16 CM |
714 | #ifndef finish_arch_post_lock_switch |
715 | # define finish_arch_post_lock_switch() do { } while (0) | |
716 | #endif | |
029632fb PZ |
717 | |
718 | #ifndef __ARCH_WANT_UNLOCKED_CTXSW | |
719 | static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next) | |
720 | { | |
721 | #ifdef CONFIG_SMP | |
722 | /* | |
723 | * We can optimise this out completely for !SMP, because the | |
724 | * SMP rebalancing from interrupt is the only thing that cares | |
725 | * here. | |
726 | */ | |
727 | next->on_cpu = 1; | |
728 | #endif | |
729 | } | |
730 | ||
731 | static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) | |
732 | { | |
733 | #ifdef CONFIG_SMP | |
734 | /* | |
735 | * After ->on_cpu is cleared, the task can be moved to a different CPU. | |
736 | * We must ensure this doesn't happen until the switch is completely | |
737 | * finished. | |
738 | */ | |
739 | smp_wmb(); | |
740 | prev->on_cpu = 0; | |
741 | #endif | |
742 | #ifdef CONFIG_DEBUG_SPINLOCK | |
743 | /* this is a valid case when another task releases the spinlock */ | |
744 | rq->lock.owner = current; | |
745 | #endif | |
746 | /* | |
747 | * If we are tracking spinlock dependencies then we have to | |
748 | * fix up the runqueue lock - which gets 'carried over' from | |
749 | * prev into current: | |
750 | */ | |
751 | spin_acquire(&rq->lock.dep_map, 0, 0, _THIS_IP_); | |
752 | ||
753 | raw_spin_unlock_irq(&rq->lock); | |
754 | } | |
755 | ||
756 | #else /* __ARCH_WANT_UNLOCKED_CTXSW */ | |
757 | static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next) | |
758 | { | |
759 | #ifdef CONFIG_SMP | |
760 | /* | |
761 | * We can optimise this out completely for !SMP, because the | |
762 | * SMP rebalancing from interrupt is the only thing that cares | |
763 | * here. | |
764 | */ | |
765 | next->on_cpu = 1; | |
766 | #endif | |
029632fb | 767 | raw_spin_unlock(&rq->lock); |
029632fb PZ |
768 | } |
769 | ||
770 | static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) | |
771 | { | |
772 | #ifdef CONFIG_SMP | |
773 | /* | |
774 | * After ->on_cpu is cleared, the task can be moved to a different CPU. | |
775 | * We must ensure this doesn't happen until the switch is completely | |
776 | * finished. | |
777 | */ | |
778 | smp_wmb(); | |
779 | prev->on_cpu = 0; | |
780 | #endif | |
029632fb | 781 | local_irq_enable(); |
029632fb PZ |
782 | } |
783 | #endif /* __ARCH_WANT_UNLOCKED_CTXSW */ | |
784 | ||
785 | ||
786 | static inline void update_load_add(struct load_weight *lw, unsigned long inc) | |
787 | { | |
788 | lw->weight += inc; | |
789 | lw->inv_weight = 0; | |
790 | } | |
791 | ||
792 | static inline void update_load_sub(struct load_weight *lw, unsigned long dec) | |
793 | { | |
794 | lw->weight -= dec; | |
795 | lw->inv_weight = 0; | |
796 | } | |
797 | ||
798 | static inline void update_load_set(struct load_weight *lw, unsigned long w) | |
799 | { | |
800 | lw->weight = w; | |
801 | lw->inv_weight = 0; | |
802 | } | |
803 | ||
804 | /* | |
805 | * To aid in avoiding the subversion of "niceness" due to uneven distribution | |
806 | * of tasks with abnormal "nice" values across CPUs the contribution that | |
807 | * each task makes to its run queue's load is weighted according to its | |
808 | * scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a | |
809 | * scaled version of the new time slice allocation that they receive on time | |
810 | * slice expiry etc. | |
811 | */ | |
812 | ||
813 | #define WEIGHT_IDLEPRIO 3 | |
814 | #define WMULT_IDLEPRIO 1431655765 | |
815 | ||
816 | /* | |
817 | * Nice levels are multiplicative, with a gentle 10% change for every | |
818 | * nice level changed. I.e. when a CPU-bound task goes from nice 0 to | |
819 | * nice 1, it will get ~10% less CPU time than another CPU-bound task | |
820 | * that remained on nice 0. | |
821 | * | |
822 | * The "10% effect" is relative and cumulative: from _any_ nice level, | |
823 | * if you go up 1 level, it's -10% CPU usage, if you go down 1 level | |
824 | * it's +10% CPU usage. (to achieve that we use a multiplier of 1.25. | |
825 | * If a task goes up by ~10% and another task goes down by ~10% then | |
826 | * the relative distance between them is ~25%.) | |
827 | */ | |
828 | static const int prio_to_weight[40] = { | |
829 | /* -20 */ 88761, 71755, 56483, 46273, 36291, | |
830 | /* -15 */ 29154, 23254, 18705, 14949, 11916, | |
831 | /* -10 */ 9548, 7620, 6100, 4904, 3906, | |
832 | /* -5 */ 3121, 2501, 1991, 1586, 1277, | |
833 | /* 0 */ 1024, 820, 655, 526, 423, | |
834 | /* 5 */ 335, 272, 215, 172, 137, | |
835 | /* 10 */ 110, 87, 70, 56, 45, | |
836 | /* 15 */ 36, 29, 23, 18, 15, | |
837 | }; | |
838 | ||
839 | /* | |
840 | * Inverse (2^32/x) values of the prio_to_weight[] array, precalculated. | |
841 | * | |
842 | * In cases where the weight does not change often, we can use the | |
843 | * precalculated inverse to speed up arithmetics by turning divisions | |
844 | * into multiplications: | |
845 | */ | |
846 | static const u32 prio_to_wmult[40] = { | |
847 | /* -20 */ 48388, 59856, 76040, 92818, 118348, | |
848 | /* -15 */ 147320, 184698, 229616, 287308, 360437, | |
849 | /* -10 */ 449829, 563644, 704093, 875809, 1099582, | |
850 | /* -5 */ 1376151, 1717300, 2157191, 2708050, 3363326, | |
851 | /* 0 */ 4194304, 5237765, 6557202, 8165337, 10153587, | |
852 | /* 5 */ 12820798, 15790321, 19976592, 24970740, 31350126, | |
853 | /* 10 */ 39045157, 49367440, 61356676, 76695844, 95443717, | |
854 | /* 15 */ 119304647, 148102320, 186737708, 238609294, 286331153, | |
855 | }; | |
856 | ||
857 | /* Time spent by the tasks of the cpu accounting group executing in ... */ | |
858 | enum cpuacct_stat_index { | |
859 | CPUACCT_STAT_USER, /* ... user mode */ | |
860 | CPUACCT_STAT_SYSTEM, /* ... kernel mode */ | |
861 | ||
862 | CPUACCT_STAT_NSTATS, | |
863 | }; | |
864 | ||
865 | ||
866 | #define sched_class_highest (&stop_sched_class) | |
867 | #define for_each_class(class) \ | |
868 | for (class = sched_class_highest; class; class = class->next) | |
869 | ||
870 | extern const struct sched_class stop_sched_class; | |
871 | extern const struct sched_class rt_sched_class; | |
872 | extern const struct sched_class fair_sched_class; | |
873 | extern const struct sched_class idle_sched_class; | |
874 | ||
875 | ||
876 | #ifdef CONFIG_SMP | |
877 | ||
878 | extern void trigger_load_balance(struct rq *rq, int cpu); | |
879 | extern void idle_balance(int this_cpu, struct rq *this_rq); | |
880 | ||
881 | #else /* CONFIG_SMP */ | |
882 | ||
883 | static inline void idle_balance(int cpu, struct rq *rq) | |
884 | { | |
885 | } | |
886 | ||
887 | #endif | |
888 | ||
889 | extern void sysrq_sched_debug_show(void); | |
890 | extern void sched_init_granularity(void); | |
891 | extern void update_max_interval(void); | |
892 | extern void update_group_power(struct sched_domain *sd, int cpu); | |
893 | extern int update_runtime(struct notifier_block *nfb, unsigned long action, void *hcpu); | |
894 | extern void init_sched_rt_class(void); | |
895 | extern void init_sched_fair_class(void); | |
896 | ||
897 | extern void resched_task(struct task_struct *p); | |
898 | extern void resched_cpu(int cpu); | |
899 | ||
900 | extern struct rt_bandwidth def_rt_bandwidth; | |
901 | extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime); | |
902 | ||
556061b0 | 903 | extern void update_idle_cpu_load(struct rq *this_rq); |
029632fb PZ |
904 | |
905 | #ifdef CONFIG_CGROUP_CPUACCT | |
54c707e9 GC |
906 | #include <linux/cgroup.h> |
907 | /* track cpu usage of a group of tasks and its child groups */ | |
908 | struct cpuacct { | |
909 | struct cgroup_subsys_state css; | |
910 | /* cpuusage holds pointer to a u64-type object on every cpu */ | |
911 | u64 __percpu *cpuusage; | |
912 | struct kernel_cpustat __percpu *cpustat; | |
913 | }; | |
914 | ||
73fbec60 FW |
915 | extern struct cgroup_subsys cpuacct_subsys; |
916 | extern struct cpuacct root_cpuacct; | |
917 | ||
54c707e9 GC |
918 | /* return cpu accounting group corresponding to this container */ |
919 | static inline struct cpuacct *cgroup_ca(struct cgroup *cgrp) | |
920 | { | |
921 | return container_of(cgroup_subsys_state(cgrp, cpuacct_subsys_id), | |
922 | struct cpuacct, css); | |
923 | } | |
924 | ||
925 | /* return cpu accounting group to which this task belongs */ | |
926 | static inline struct cpuacct *task_ca(struct task_struct *tsk) | |
927 | { | |
928 | return container_of(task_subsys_state(tsk, cpuacct_subsys_id), | |
929 | struct cpuacct, css); | |
930 | } | |
931 | ||
932 | static inline struct cpuacct *parent_ca(struct cpuacct *ca) | |
933 | { | |
934 | if (!ca || !ca->css.cgroup->parent) | |
935 | return NULL; | |
936 | return cgroup_ca(ca->css.cgroup->parent); | |
937 | } | |
938 | ||
029632fb | 939 | extern void cpuacct_charge(struct task_struct *tsk, u64 cputime); |
029632fb PZ |
940 | #else |
941 | static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {} | |
029632fb PZ |
942 | #endif |
943 | ||
73fbec60 FW |
944 | #ifdef CONFIG_PARAVIRT |
945 | static inline u64 steal_ticks(u64 steal) | |
946 | { | |
947 | if (unlikely(steal > NSEC_PER_SEC)) | |
948 | return div_u64(steal, TICK_NSEC); | |
949 | ||
950 | return __iter_div_u64_rem(steal, TICK_NSEC, &steal); | |
951 | } | |
952 | #endif | |
953 | ||
029632fb PZ |
954 | static inline void inc_nr_running(struct rq *rq) |
955 | { | |
956 | rq->nr_running++; | |
957 | } | |
958 | ||
959 | static inline void dec_nr_running(struct rq *rq) | |
960 | { | |
961 | rq->nr_running--; | |
962 | } | |
963 | ||
964 | extern void update_rq_clock(struct rq *rq); | |
965 | ||
966 | extern void activate_task(struct rq *rq, struct task_struct *p, int flags); | |
967 | extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags); | |
968 | ||
969 | extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags); | |
970 | ||
971 | extern const_debug unsigned int sysctl_sched_time_avg; | |
972 | extern const_debug unsigned int sysctl_sched_nr_migrate; | |
973 | extern const_debug unsigned int sysctl_sched_migration_cost; | |
974 | ||
975 | static inline u64 sched_avg_period(void) | |
976 | { | |
977 | return (u64)sysctl_sched_time_avg * NSEC_PER_MSEC / 2; | |
978 | } | |
979 | ||
029632fb PZ |
980 | #ifdef CONFIG_SCHED_HRTICK |
981 | ||
982 | /* | |
983 | * Use hrtick when: | |
984 | * - enabled by features | |
985 | * - hrtimer is actually high res | |
986 | */ | |
987 | static inline int hrtick_enabled(struct rq *rq) | |
988 | { | |
989 | if (!sched_feat(HRTICK)) | |
990 | return 0; | |
991 | if (!cpu_active(cpu_of(rq))) | |
992 | return 0; | |
993 | return hrtimer_is_hres_active(&rq->hrtick_timer); | |
994 | } | |
995 | ||
996 | void hrtick_start(struct rq *rq, u64 delay); | |
997 | ||
b39e66ea MG |
998 | #else |
999 | ||
1000 | static inline int hrtick_enabled(struct rq *rq) | |
1001 | { | |
1002 | return 0; | |
1003 | } | |
1004 | ||
029632fb PZ |
1005 | #endif /* CONFIG_SCHED_HRTICK */ |
1006 | ||
1007 | #ifdef CONFIG_SMP | |
1008 | extern void sched_avg_update(struct rq *rq); | |
1009 | static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) | |
1010 | { | |
1011 | rq->rt_avg += rt_delta; | |
1012 | sched_avg_update(rq); | |
1013 | } | |
1014 | #else | |
1015 | static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { } | |
1016 | static inline void sched_avg_update(struct rq *rq) { } | |
1017 | #endif | |
1018 | ||
1019 | extern void start_bandwidth_timer(struct hrtimer *period_timer, ktime_t period); | |
1020 | ||
1021 | #ifdef CONFIG_SMP | |
1022 | #ifdef CONFIG_PREEMPT | |
1023 | ||
1024 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2); | |
1025 | ||
1026 | /* | |
1027 | * fair double_lock_balance: Safely acquires both rq->locks in a fair | |
1028 | * way at the expense of forcing extra atomic operations in all | |
1029 | * invocations. This assures that the double_lock is acquired using the | |
1030 | * same underlying policy as the spinlock_t on this architecture, which | |
1031 | * reduces latency compared to the unfair variant below. However, it | |
1032 | * also adds more overhead and therefore may reduce throughput. | |
1033 | */ | |
1034 | static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
1035 | __releases(this_rq->lock) | |
1036 | __acquires(busiest->lock) | |
1037 | __acquires(this_rq->lock) | |
1038 | { | |
1039 | raw_spin_unlock(&this_rq->lock); | |
1040 | double_rq_lock(this_rq, busiest); | |
1041 | ||
1042 | return 1; | |
1043 | } | |
1044 | ||
1045 | #else | |
1046 | /* | |
1047 | * Unfair double_lock_balance: Optimizes throughput at the expense of | |
1048 | * latency by eliminating extra atomic operations when the locks are | |
1049 | * already in proper order on entry. This favors lower cpu-ids and will | |
1050 | * grant the double lock to lower cpus over higher ids under contention, | |
1051 | * regardless of entry order into the function. | |
1052 | */ | |
1053 | static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
1054 | __releases(this_rq->lock) | |
1055 | __acquires(busiest->lock) | |
1056 | __acquires(this_rq->lock) | |
1057 | { | |
1058 | int ret = 0; | |
1059 | ||
1060 | if (unlikely(!raw_spin_trylock(&busiest->lock))) { | |
1061 | if (busiest < this_rq) { | |
1062 | raw_spin_unlock(&this_rq->lock); | |
1063 | raw_spin_lock(&busiest->lock); | |
1064 | raw_spin_lock_nested(&this_rq->lock, | |
1065 | SINGLE_DEPTH_NESTING); | |
1066 | ret = 1; | |
1067 | } else | |
1068 | raw_spin_lock_nested(&busiest->lock, | |
1069 | SINGLE_DEPTH_NESTING); | |
1070 | } | |
1071 | return ret; | |
1072 | } | |
1073 | ||
1074 | #endif /* CONFIG_PREEMPT */ | |
1075 | ||
1076 | /* | |
1077 | * double_lock_balance - lock the busiest runqueue, this_rq is locked already. | |
1078 | */ | |
1079 | static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest) | |
1080 | { | |
1081 | if (unlikely(!irqs_disabled())) { | |
1082 | /* printk() doesn't work good under rq->lock */ | |
1083 | raw_spin_unlock(&this_rq->lock); | |
1084 | BUG_ON(1); | |
1085 | } | |
1086 | ||
1087 | return _double_lock_balance(this_rq, busiest); | |
1088 | } | |
1089 | ||
1090 | static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest) | |
1091 | __releases(busiest->lock) | |
1092 | { | |
1093 | raw_spin_unlock(&busiest->lock); | |
1094 | lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_); | |
1095 | } | |
1096 | ||
1097 | /* | |
1098 | * double_rq_lock - safely lock two runqueues | |
1099 | * | |
1100 | * Note this does not disable interrupts like task_rq_lock, | |
1101 | * you need to do so manually before calling. | |
1102 | */ | |
1103 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) | |
1104 | __acquires(rq1->lock) | |
1105 | __acquires(rq2->lock) | |
1106 | { | |
1107 | BUG_ON(!irqs_disabled()); | |
1108 | if (rq1 == rq2) { | |
1109 | raw_spin_lock(&rq1->lock); | |
1110 | __acquire(rq2->lock); /* Fake it out ;) */ | |
1111 | } else { | |
1112 | if (rq1 < rq2) { | |
1113 | raw_spin_lock(&rq1->lock); | |
1114 | raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING); | |
1115 | } else { | |
1116 | raw_spin_lock(&rq2->lock); | |
1117 | raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING); | |
1118 | } | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | /* | |
1123 | * double_rq_unlock - safely unlock two runqueues | |
1124 | * | |
1125 | * Note this does not restore interrupts like task_rq_unlock, | |
1126 | * you need to do so manually after calling. | |
1127 | */ | |
1128 | static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) | |
1129 | __releases(rq1->lock) | |
1130 | __releases(rq2->lock) | |
1131 | { | |
1132 | raw_spin_unlock(&rq1->lock); | |
1133 | if (rq1 != rq2) | |
1134 | raw_spin_unlock(&rq2->lock); | |
1135 | else | |
1136 | __release(rq2->lock); | |
1137 | } | |
1138 | ||
1139 | #else /* CONFIG_SMP */ | |
1140 | ||
1141 | /* | |
1142 | * double_rq_lock - safely lock two runqueues | |
1143 | * | |
1144 | * Note this does not disable interrupts like task_rq_lock, | |
1145 | * you need to do so manually before calling. | |
1146 | */ | |
1147 | static inline void double_rq_lock(struct rq *rq1, struct rq *rq2) | |
1148 | __acquires(rq1->lock) | |
1149 | __acquires(rq2->lock) | |
1150 | { | |
1151 | BUG_ON(!irqs_disabled()); | |
1152 | BUG_ON(rq1 != rq2); | |
1153 | raw_spin_lock(&rq1->lock); | |
1154 | __acquire(rq2->lock); /* Fake it out ;) */ | |
1155 | } | |
1156 | ||
1157 | /* | |
1158 | * double_rq_unlock - safely unlock two runqueues | |
1159 | * | |
1160 | * Note this does not restore interrupts like task_rq_unlock, | |
1161 | * you need to do so manually after calling. | |
1162 | */ | |
1163 | static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2) | |
1164 | __releases(rq1->lock) | |
1165 | __releases(rq2->lock) | |
1166 | { | |
1167 | BUG_ON(rq1 != rq2); | |
1168 | raw_spin_unlock(&rq1->lock); | |
1169 | __release(rq2->lock); | |
1170 | } | |
1171 | ||
1172 | #endif | |
1173 | ||
1174 | extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq); | |
1175 | extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq); | |
1176 | extern void print_cfs_stats(struct seq_file *m, int cpu); | |
1177 | extern void print_rt_stats(struct seq_file *m, int cpu); | |
1178 | ||
1179 | extern void init_cfs_rq(struct cfs_rq *cfs_rq); | |
1180 | extern void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq); | |
029632fb PZ |
1181 | |
1182 | extern void account_cfs_bandwidth_used(int enabled, int was_enabled); | |
1c792db7 SS |
1183 | |
1184 | #ifdef CONFIG_NO_HZ | |
1185 | enum rq_nohz_flag_bits { | |
1186 | NOHZ_TICK_STOPPED, | |
1187 | NOHZ_BALANCE_KICK, | |
69e1e811 | 1188 | NOHZ_IDLE, |
1c792db7 SS |
1189 | }; |
1190 | ||
1191 | #define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags) | |
1192 | #endif | |
73fbec60 FW |
1193 | |
1194 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING | |
1195 | ||
1196 | DECLARE_PER_CPU(u64, cpu_hardirq_time); | |
1197 | DECLARE_PER_CPU(u64, cpu_softirq_time); | |
1198 | ||
1199 | #ifndef CONFIG_64BIT | |
1200 | DECLARE_PER_CPU(seqcount_t, irq_time_seq); | |
1201 | ||
1202 | static inline void irq_time_write_begin(void) | |
1203 | { | |
1204 | __this_cpu_inc(irq_time_seq.sequence); | |
1205 | smp_wmb(); | |
1206 | } | |
1207 | ||
1208 | static inline void irq_time_write_end(void) | |
1209 | { | |
1210 | smp_wmb(); | |
1211 | __this_cpu_inc(irq_time_seq.sequence); | |
1212 | } | |
1213 | ||
1214 | static inline u64 irq_time_read(int cpu) | |
1215 | { | |
1216 | u64 irq_time; | |
1217 | unsigned seq; | |
1218 | ||
1219 | do { | |
1220 | seq = read_seqcount_begin(&per_cpu(irq_time_seq, cpu)); | |
1221 | irq_time = per_cpu(cpu_softirq_time, cpu) + | |
1222 | per_cpu(cpu_hardirq_time, cpu); | |
1223 | } while (read_seqcount_retry(&per_cpu(irq_time_seq, cpu), seq)); | |
1224 | ||
1225 | return irq_time; | |
1226 | } | |
1227 | #else /* CONFIG_64BIT */ | |
1228 | static inline void irq_time_write_begin(void) | |
1229 | { | |
1230 | } | |
1231 | ||
1232 | static inline void irq_time_write_end(void) | |
1233 | { | |
1234 | } | |
1235 | ||
1236 | static inline u64 irq_time_read(int cpu) | |
1237 | { | |
1238 | return per_cpu(cpu_softirq_time, cpu) + per_cpu(cpu_hardirq_time, cpu); | |
1239 | } | |
1240 | #endif /* CONFIG_64BIT */ | |
1241 | #endif /* CONFIG_IRQ_TIME_ACCOUNTING */ |