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bf0f6f24 IM |
1 | /* |
2 | * Completely Fair Scheduling (CFS) Class (SCHED_NORMAL/SCHED_BATCH) | |
3 | * | |
4 | * Copyright (C) 2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> | |
5 | * | |
6 | * Interactivity improvements by Mike Galbraith | |
7 | * (C) 2007 Mike Galbraith <efault@gmx.de> | |
8 | * | |
9 | * Various enhancements by Dmitry Adamushko. | |
10 | * (C) 2007 Dmitry Adamushko <dmitry.adamushko@gmail.com> | |
11 | * | |
12 | * Group scheduling enhancements by Srivatsa Vaddagiri | |
13 | * Copyright IBM Corporation, 2007 | |
14 | * Author: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> | |
15 | * | |
16 | * Scaled math optimizations by Thomas Gleixner | |
17 | * Copyright (C) 2007, Thomas Gleixner <tglx@linutronix.de> | |
21805085 PZ |
18 | * |
19 | * Adaptive scheduling granularity, math enhancements by Peter Zijlstra | |
20 | * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com> | |
bf0f6f24 IM |
21 | */ |
22 | ||
23 | /* | |
21805085 PZ |
24 | * Targeted preemption latency for CPU-bound tasks: |
25 | * (default: 20ms, units: nanoseconds) | |
bf0f6f24 | 26 | * |
21805085 PZ |
27 | * NOTE: this latency value is not the same as the concept of |
28 | * 'timeslice length' - timeslices in CFS are of variable length. | |
29 | * (to see the precise effective timeslice length of your workload, | |
30 | * run vmstat and monitor the context-switches field) | |
bf0f6f24 IM |
31 | * |
32 | * On SMP systems the value of this is multiplied by the log2 of the | |
33 | * number of CPUs. (i.e. factor 2x on 2-way systems, 3x on 4-way | |
34 | * systems, 4x on 8-way systems, 5x on 16-way systems, etc.) | |
21805085 | 35 | * Targeted preemption latency for CPU-bound tasks: |
bf0f6f24 | 36 | */ |
2bd8e6d4 IM |
37 | const_debug unsigned int sysctl_sched_latency = 20000000ULL; |
38 | ||
39 | /* | |
40 | * After fork, child runs first. (default) If set to 0 then | |
41 | * parent will (try to) run first. | |
42 | */ | |
43 | const_debug unsigned int sysctl_sched_child_runs_first = 1; | |
21805085 PZ |
44 | |
45 | /* | |
46 | * Minimal preemption granularity for CPU-bound tasks: | |
47 | * (default: 2 msec, units: nanoseconds) | |
48 | */ | |
172ac3db | 49 | unsigned int sysctl_sched_min_granularity __read_mostly = 2000000ULL; |
bf0f6f24 | 50 | |
1799e35d IM |
51 | /* |
52 | * sys_sched_yield() compat mode | |
53 | * | |
54 | * This option switches the agressive yield implementation of the | |
55 | * old scheduler back on. | |
56 | */ | |
57 | unsigned int __read_mostly sysctl_sched_compat_yield; | |
58 | ||
bf0f6f24 IM |
59 | /* |
60 | * SCHED_BATCH wake-up granularity. | |
71fd3714 | 61 | * (default: 25 msec, units: nanoseconds) |
bf0f6f24 IM |
62 | * |
63 | * This option delays the preemption effects of decoupled workloads | |
64 | * and reduces their over-scheduling. Synchronous workloads will still | |
65 | * have immediate wakeup/sleep latencies. | |
66 | */ | |
2bd8e6d4 | 67 | const_debug unsigned int sysctl_sched_batch_wakeup_granularity = 25000000UL; |
bf0f6f24 IM |
68 | |
69 | /* | |
70 | * SCHED_OTHER wake-up granularity. | |
71 | * (default: 1 msec, units: nanoseconds) | |
72 | * | |
73 | * This option delays the preemption effects of decoupled workloads | |
74 | * and reduces their over-scheduling. Synchronous workloads will still | |
75 | * have immediate wakeup/sleep latencies. | |
76 | */ | |
2e09bf55 | 77 | const_debug unsigned int sysctl_sched_wakeup_granularity = 2000000UL; |
bf0f6f24 | 78 | |
bf0f6f24 IM |
79 | extern struct sched_class fair_sched_class; |
80 | ||
81 | /************************************************************** | |
82 | * CFS operations on generic schedulable entities: | |
83 | */ | |
84 | ||
62160e3f | 85 | #ifdef CONFIG_FAIR_GROUP_SCHED |
bf0f6f24 | 86 | |
62160e3f | 87 | /* cpu runqueue to which this cfs_rq is attached */ |
bf0f6f24 IM |
88 | static inline struct rq *rq_of(struct cfs_rq *cfs_rq) |
89 | { | |
62160e3f | 90 | return cfs_rq->rq; |
bf0f6f24 IM |
91 | } |
92 | ||
62160e3f IM |
93 | /* An entity is a task if it doesn't "own" a runqueue */ |
94 | #define entity_is_task(se) (!se->my_q) | |
bf0f6f24 | 95 | |
62160e3f | 96 | #else /* CONFIG_FAIR_GROUP_SCHED */ |
bf0f6f24 | 97 | |
62160e3f IM |
98 | static inline struct rq *rq_of(struct cfs_rq *cfs_rq) |
99 | { | |
100 | return container_of(cfs_rq, struct rq, cfs); | |
bf0f6f24 IM |
101 | } |
102 | ||
103 | #define entity_is_task(se) 1 | |
104 | ||
bf0f6f24 IM |
105 | #endif /* CONFIG_FAIR_GROUP_SCHED */ |
106 | ||
107 | static inline struct task_struct *task_of(struct sched_entity *se) | |
108 | { | |
109 | return container_of(se, struct task_struct, se); | |
110 | } | |
111 | ||
112 | ||
113 | /************************************************************** | |
114 | * Scheduling class tree data structure manipulation methods: | |
115 | */ | |
116 | ||
02e0431a PZ |
117 | static inline u64 |
118 | max_vruntime(u64 min_vruntime, u64 vruntime) | |
119 | { | |
368059a9 PZ |
120 | s64 delta = (s64)(vruntime - min_vruntime); |
121 | if (delta > 0) | |
02e0431a PZ |
122 | min_vruntime = vruntime; |
123 | ||
124 | return min_vruntime; | |
125 | } | |
126 | ||
e9acbff6 IM |
127 | static inline void |
128 | set_leftmost(struct cfs_rq *cfs_rq, struct rb_node *leftmost) | |
129 | { | |
130 | struct sched_entity *se; | |
131 | ||
132 | cfs_rq->rb_leftmost = leftmost; | |
02e0431a | 133 | if (leftmost) |
e9acbff6 | 134 | se = rb_entry(leftmost, struct sched_entity, run_node); |
e9acbff6 IM |
135 | } |
136 | ||
02e0431a PZ |
137 | static inline s64 |
138 | entity_key(struct cfs_rq *cfs_rq, struct sched_entity *se) | |
9014623c | 139 | { |
30cfdcfc | 140 | return se->vruntime - cfs_rq->min_vruntime; |
9014623c PZ |
141 | } |
142 | ||
bf0f6f24 IM |
143 | /* |
144 | * Enqueue an entity into the rb-tree: | |
145 | */ | |
19ccd97a | 146 | static void |
bf0f6f24 IM |
147 | __enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se) |
148 | { | |
149 | struct rb_node **link = &cfs_rq->tasks_timeline.rb_node; | |
150 | struct rb_node *parent = NULL; | |
151 | struct sched_entity *entry; | |
9014623c | 152 | s64 key = entity_key(cfs_rq, se); |
bf0f6f24 IM |
153 | int leftmost = 1; |
154 | ||
155 | /* | |
156 | * Find the right place in the rbtree: | |
157 | */ | |
158 | while (*link) { | |
159 | parent = *link; | |
160 | entry = rb_entry(parent, struct sched_entity, run_node); | |
161 | /* | |
162 | * We dont care about collisions. Nodes with | |
163 | * the same key stay together. | |
164 | */ | |
9014623c | 165 | if (key < entity_key(cfs_rq, entry)) { |
bf0f6f24 IM |
166 | link = &parent->rb_left; |
167 | } else { | |
168 | link = &parent->rb_right; | |
169 | leftmost = 0; | |
170 | } | |
171 | } | |
172 | ||
173 | /* | |
174 | * Maintain a cache of leftmost tree entries (it is frequently | |
175 | * used): | |
176 | */ | |
177 | if (leftmost) | |
e9acbff6 | 178 | set_leftmost(cfs_rq, &se->run_node); |
bf0f6f24 IM |
179 | |
180 | rb_link_node(&se->run_node, parent, link); | |
181 | rb_insert_color(&se->run_node, &cfs_rq->tasks_timeline); | |
bf0f6f24 IM |
182 | } |
183 | ||
19ccd97a | 184 | static void |
bf0f6f24 IM |
185 | __dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se) |
186 | { | |
187 | if (cfs_rq->rb_leftmost == &se->run_node) | |
e9acbff6 IM |
188 | set_leftmost(cfs_rq, rb_next(&se->run_node)); |
189 | ||
bf0f6f24 | 190 | rb_erase(&se->run_node, &cfs_rq->tasks_timeline); |
bf0f6f24 IM |
191 | } |
192 | ||
193 | static inline struct rb_node *first_fair(struct cfs_rq *cfs_rq) | |
194 | { | |
195 | return cfs_rq->rb_leftmost; | |
196 | } | |
197 | ||
198 | static struct sched_entity *__pick_next_entity(struct cfs_rq *cfs_rq) | |
199 | { | |
200 | return rb_entry(first_fair(cfs_rq), struct sched_entity, run_node); | |
201 | } | |
202 | ||
aeb73b04 PZ |
203 | static inline struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq) |
204 | { | |
205 | struct rb_node **link = &cfs_rq->tasks_timeline.rb_node; | |
206 | struct sched_entity *se = NULL; | |
207 | struct rb_node *parent; | |
208 | ||
209 | while (*link) { | |
210 | parent = *link; | |
211 | se = rb_entry(parent, struct sched_entity, run_node); | |
212 | link = &parent->rb_right; | |
213 | } | |
214 | ||
215 | return se; | |
216 | } | |
217 | ||
bf0f6f24 IM |
218 | /************************************************************** |
219 | * Scheduling class statistics methods: | |
220 | */ | |
221 | ||
4d78e7b6 PZ |
222 | static u64 __sched_period(unsigned long nr_running) |
223 | { | |
224 | u64 period = sysctl_sched_latency; | |
225 | unsigned long nr_latency = | |
226 | sysctl_sched_latency / sysctl_sched_min_granularity; | |
227 | ||
228 | if (unlikely(nr_running > nr_latency)) { | |
229 | period *= nr_running; | |
230 | do_div(period, nr_latency); | |
231 | } | |
232 | ||
233 | return period; | |
234 | } | |
235 | ||
6d0f0ebd | 236 | static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se) |
21805085 | 237 | { |
6d0f0ebd | 238 | u64 period = __sched_period(cfs_rq->nr_running); |
21805085 | 239 | |
6d0f0ebd PZ |
240 | period *= se->load.weight; |
241 | do_div(period, cfs_rq->load.weight); | |
21805085 | 242 | |
6d0f0ebd | 243 | return period; |
bf0f6f24 IM |
244 | } |
245 | ||
67e9fb2a PZ |
246 | static u64 __sched_vslice(unsigned long nr_running) |
247 | { | |
248 | u64 period = __sched_period(nr_running); | |
249 | ||
250 | do_div(period, nr_running); | |
251 | ||
252 | return period; | |
253 | } | |
254 | ||
bf0f6f24 IM |
255 | /* |
256 | * Update the current task's runtime statistics. Skip current tasks that | |
257 | * are not in our scheduling class. | |
258 | */ | |
259 | static inline void | |
8ebc91d9 IM |
260 | __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr, |
261 | unsigned long delta_exec) | |
bf0f6f24 | 262 | { |
bbdba7c0 | 263 | unsigned long delta_exec_weighted; |
02e0431a | 264 | u64 next_vruntime, min_vruntime; |
bf0f6f24 | 265 | |
8179ca23 | 266 | schedstat_set(curr->exec_max, max((u64)delta_exec, curr->exec_max)); |
bf0f6f24 IM |
267 | |
268 | curr->sum_exec_runtime += delta_exec; | |
7a62eabc | 269 | schedstat_add(cfs_rq, exec_clock, delta_exec); |
e9acbff6 IM |
270 | delta_exec_weighted = delta_exec; |
271 | if (unlikely(curr->load.weight != NICE_0_LOAD)) { | |
272 | delta_exec_weighted = calc_delta_fair(delta_exec_weighted, | |
273 | &curr->load); | |
274 | } | |
275 | curr->vruntime += delta_exec_weighted; | |
02e0431a PZ |
276 | |
277 | /* | |
278 | * maintain cfs_rq->min_vruntime to be a monotonic increasing | |
279 | * value tracking the leftmost vruntime in the tree. | |
280 | */ | |
281 | if (first_fair(cfs_rq)) { | |
282 | next_vruntime = __pick_next_entity(cfs_rq)->vruntime; | |
283 | ||
284 | /* min_vruntime() := !max_vruntime() */ | |
285 | min_vruntime = max_vruntime(curr->vruntime, next_vruntime); | |
286 | if (min_vruntime == next_vruntime) | |
287 | min_vruntime = curr->vruntime; | |
288 | else | |
289 | min_vruntime = next_vruntime; | |
290 | } else | |
291 | min_vruntime = curr->vruntime; | |
292 | ||
293 | cfs_rq->min_vruntime = | |
294 | max_vruntime(cfs_rq->min_vruntime, min_vruntime); | |
bf0f6f24 IM |
295 | } |
296 | ||
b7cc0896 | 297 | static void update_curr(struct cfs_rq *cfs_rq) |
bf0f6f24 | 298 | { |
429d43bc | 299 | struct sched_entity *curr = cfs_rq->curr; |
8ebc91d9 | 300 | u64 now = rq_of(cfs_rq)->clock; |
bf0f6f24 IM |
301 | unsigned long delta_exec; |
302 | ||
303 | if (unlikely(!curr)) | |
304 | return; | |
305 | ||
306 | /* | |
307 | * Get the amount of time the current task was running | |
308 | * since the last time we changed load (this cannot | |
309 | * overflow on 32 bits): | |
310 | */ | |
8ebc91d9 | 311 | delta_exec = (unsigned long)(now - curr->exec_start); |
bf0f6f24 | 312 | |
8ebc91d9 IM |
313 | __update_curr(cfs_rq, curr, delta_exec); |
314 | curr->exec_start = now; | |
bf0f6f24 IM |
315 | } |
316 | ||
317 | static inline void | |
5870db5b | 318 | update_stats_wait_start(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 | 319 | { |
d281918d | 320 | schedstat_set(se->wait_start, rq_of(cfs_rq)->clock); |
bf0f6f24 IM |
321 | } |
322 | ||
bf0f6f24 | 323 | static inline unsigned long |
08e2388a | 324 | calc_weighted(unsigned long delta, struct sched_entity *se) |
bf0f6f24 | 325 | { |
08e2388a | 326 | unsigned long weight = se->load.weight; |
bf0f6f24 | 327 | |
08e2388a IM |
328 | if (unlikely(weight != NICE_0_LOAD)) |
329 | return (u64)delta * se->load.weight >> NICE_0_SHIFT; | |
330 | else | |
331 | return delta; | |
bf0f6f24 | 332 | } |
bf0f6f24 IM |
333 | |
334 | /* | |
335 | * Task is being enqueued - update stats: | |
336 | */ | |
d2417e5a | 337 | static void update_stats_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 | 338 | { |
bf0f6f24 IM |
339 | /* |
340 | * Are we enqueueing a waiting task? (for current tasks | |
341 | * a dequeue/enqueue event is a NOP) | |
342 | */ | |
429d43bc | 343 | if (se != cfs_rq->curr) |
5870db5b | 344 | update_stats_wait_start(cfs_rq, se); |
bf0f6f24 IM |
345 | } |
346 | ||
bf0f6f24 | 347 | static void |
9ef0a961 | 348 | update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 | 349 | { |
bbdba7c0 IM |
350 | schedstat_set(se->wait_max, max(se->wait_max, |
351 | rq_of(cfs_rq)->clock - se->wait_start)); | |
6cfb0d5d | 352 | schedstat_set(se->wait_start, 0); |
bf0f6f24 IM |
353 | } |
354 | ||
355 | static inline void | |
19b6a2e3 | 356 | update_stats_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 | 357 | { |
b7cc0896 | 358 | update_curr(cfs_rq); |
bf0f6f24 IM |
359 | /* |
360 | * Mark the end of the wait period if dequeueing a | |
361 | * waiting task: | |
362 | */ | |
429d43bc | 363 | if (se != cfs_rq->curr) |
9ef0a961 | 364 | update_stats_wait_end(cfs_rq, se); |
bf0f6f24 IM |
365 | } |
366 | ||
367 | /* | |
368 | * We are picking a new current task - update its stats: | |
369 | */ | |
370 | static inline void | |
79303e9e | 371 | update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 IM |
372 | { |
373 | /* | |
374 | * We are starting a new run period: | |
375 | */ | |
d281918d | 376 | se->exec_start = rq_of(cfs_rq)->clock; |
bf0f6f24 IM |
377 | } |
378 | ||
379 | /* | |
380 | * We are descheduling a task - update its stats: | |
381 | */ | |
382 | static inline void | |
c7e9b5b2 | 383 | update_stats_curr_end(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 IM |
384 | { |
385 | se->exec_start = 0; | |
386 | } | |
387 | ||
388 | /************************************************** | |
389 | * Scheduling class queueing methods: | |
390 | */ | |
391 | ||
30cfdcfc DA |
392 | static void |
393 | account_entity_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se) | |
394 | { | |
395 | update_load_add(&cfs_rq->load, se->load.weight); | |
396 | cfs_rq->nr_running++; | |
397 | se->on_rq = 1; | |
398 | } | |
399 | ||
400 | static void | |
401 | account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se) | |
402 | { | |
403 | update_load_sub(&cfs_rq->load, se->load.weight); | |
404 | cfs_rq->nr_running--; | |
405 | se->on_rq = 0; | |
406 | } | |
407 | ||
2396af69 | 408 | static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 | 409 | { |
bf0f6f24 IM |
410 | #ifdef CONFIG_SCHEDSTATS |
411 | if (se->sleep_start) { | |
d281918d | 412 | u64 delta = rq_of(cfs_rq)->clock - se->sleep_start; |
bf0f6f24 IM |
413 | |
414 | if ((s64)delta < 0) | |
415 | delta = 0; | |
416 | ||
417 | if (unlikely(delta > se->sleep_max)) | |
418 | se->sleep_max = delta; | |
419 | ||
420 | se->sleep_start = 0; | |
421 | se->sum_sleep_runtime += delta; | |
422 | } | |
423 | if (se->block_start) { | |
d281918d | 424 | u64 delta = rq_of(cfs_rq)->clock - se->block_start; |
bf0f6f24 IM |
425 | |
426 | if ((s64)delta < 0) | |
427 | delta = 0; | |
428 | ||
429 | if (unlikely(delta > se->block_max)) | |
430 | se->block_max = delta; | |
431 | ||
432 | se->block_start = 0; | |
433 | se->sum_sleep_runtime += delta; | |
30084fbd IM |
434 | |
435 | /* | |
436 | * Blocking time is in units of nanosecs, so shift by 20 to | |
437 | * get a milliseconds-range estimation of the amount of | |
438 | * time that the task spent sleeping: | |
439 | */ | |
440 | if (unlikely(prof_on == SLEEP_PROFILING)) { | |
e22f5bbf IM |
441 | struct task_struct *tsk = task_of(se); |
442 | ||
30084fbd IM |
443 | profile_hits(SLEEP_PROFILING, (void *)get_wchan(tsk), |
444 | delta >> 20); | |
445 | } | |
bf0f6f24 IM |
446 | } |
447 | #endif | |
448 | } | |
449 | ||
ddc97297 PZ |
450 | static void check_spread(struct cfs_rq *cfs_rq, struct sched_entity *se) |
451 | { | |
452 | #ifdef CONFIG_SCHED_DEBUG | |
453 | s64 d = se->vruntime - cfs_rq->min_vruntime; | |
454 | ||
455 | if (d < 0) | |
456 | d = -d; | |
457 | ||
458 | if (d > 3*sysctl_sched_latency) | |
459 | schedstat_inc(cfs_rq, nr_spread_over); | |
460 | #endif | |
461 | } | |
462 | ||
aeb73b04 PZ |
463 | static void |
464 | place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial) | |
465 | { | |
67e9fb2a | 466 | u64 vruntime; |
aeb73b04 | 467 | |
67e9fb2a | 468 | vruntime = cfs_rq->min_vruntime; |
94dfb5e7 PZ |
469 | |
470 | if (sched_feat(USE_TREE_AVG)) { | |
471 | struct sched_entity *last = __pick_last_entity(cfs_rq); | |
472 | if (last) { | |
67e9fb2a PZ |
473 | vruntime += last->vruntime; |
474 | vruntime >>= 1; | |
94dfb5e7 | 475 | } |
67e9fb2a PZ |
476 | } else if (sched_feat(APPROX_AVG) && cfs_rq->nr_running) |
477 | vruntime += __sched_vslice(cfs_rq->nr_running)/2; | |
94dfb5e7 PZ |
478 | |
479 | if (initial && sched_feat(START_DEBIT)) | |
67e9fb2a | 480 | vruntime += __sched_vslice(cfs_rq->nr_running + 1); |
aeb73b04 | 481 | |
8465e792 | 482 | if (!initial) { |
94359f05 IM |
483 | if (sched_feat(NEW_FAIR_SLEEPERS)) |
484 | vruntime -= sysctl_sched_latency; | |
485 | ||
b8487b92 | 486 | vruntime = max_t(s64, vruntime, se->vruntime); |
aeb73b04 PZ |
487 | } |
488 | ||
67e9fb2a PZ |
489 | se->vruntime = vruntime; |
490 | ||
aeb73b04 PZ |
491 | } |
492 | ||
bf0f6f24 | 493 | static void |
83b699ed | 494 | enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int wakeup) |
bf0f6f24 IM |
495 | { |
496 | /* | |
497 | * Update the fair clock. | |
498 | */ | |
b7cc0896 | 499 | update_curr(cfs_rq); |
bf0f6f24 | 500 | |
e9acbff6 | 501 | if (wakeup) { |
67e9fb2a | 502 | /* se->vruntime += cfs_rq->min_vruntime; */ |
aeb73b04 | 503 | place_entity(cfs_rq, se, 0); |
2396af69 | 504 | enqueue_sleeper(cfs_rq, se); |
e9acbff6 | 505 | } |
bf0f6f24 | 506 | |
d2417e5a | 507 | update_stats_enqueue(cfs_rq, se); |
ddc97297 | 508 | check_spread(cfs_rq, se); |
83b699ed SV |
509 | if (se != cfs_rq->curr) |
510 | __enqueue_entity(cfs_rq, se); | |
30cfdcfc | 511 | account_entity_enqueue(cfs_rq, se); |
bf0f6f24 IM |
512 | } |
513 | ||
514 | static void | |
525c2716 | 515 | dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int sleep) |
bf0f6f24 | 516 | { |
19b6a2e3 | 517 | update_stats_dequeue(cfs_rq, se); |
db36cc7d | 518 | if (sleep) { |
67e9fb2a | 519 | #ifdef CONFIG_SCHEDSTATS |
bf0f6f24 IM |
520 | if (entity_is_task(se)) { |
521 | struct task_struct *tsk = task_of(se); | |
522 | ||
523 | if (tsk->state & TASK_INTERRUPTIBLE) | |
d281918d | 524 | se->sleep_start = rq_of(cfs_rq)->clock; |
bf0f6f24 | 525 | if (tsk->state & TASK_UNINTERRUPTIBLE) |
d281918d | 526 | se->block_start = rq_of(cfs_rq)->clock; |
bf0f6f24 | 527 | } |
db36cc7d | 528 | #endif |
67e9fb2a PZ |
529 | } |
530 | ||
83b699ed | 531 | if (se != cfs_rq->curr) |
30cfdcfc DA |
532 | __dequeue_entity(cfs_rq, se); |
533 | account_entity_dequeue(cfs_rq, se); | |
bf0f6f24 IM |
534 | } |
535 | ||
536 | /* | |
537 | * Preempt the current task with a newly woken task if needed: | |
538 | */ | |
7c92e54f | 539 | static void |
2e09bf55 | 540 | check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr) |
bf0f6f24 | 541 | { |
11697830 PZ |
542 | unsigned long ideal_runtime, delta_exec; |
543 | ||
6d0f0ebd | 544 | ideal_runtime = sched_slice(cfs_rq, curr); |
11697830 PZ |
545 | delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime; |
546 | if (delta_exec > ideal_runtime) | |
bf0f6f24 IM |
547 | resched_task(rq_of(cfs_rq)->curr); |
548 | } | |
549 | ||
83b699ed | 550 | static void |
8494f412 | 551 | set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 | 552 | { |
83b699ed SV |
553 | /* 'current' is not kept within the tree. */ |
554 | if (se->on_rq) { | |
555 | /* | |
556 | * Any task has to be enqueued before it get to execute on | |
557 | * a CPU. So account for the time it spent waiting on the | |
558 | * runqueue. | |
559 | */ | |
560 | update_stats_wait_end(cfs_rq, se); | |
561 | __dequeue_entity(cfs_rq, se); | |
562 | } | |
563 | ||
79303e9e | 564 | update_stats_curr_start(cfs_rq, se); |
429d43bc | 565 | cfs_rq->curr = se; |
eba1ed4b IM |
566 | #ifdef CONFIG_SCHEDSTATS |
567 | /* | |
568 | * Track our maximum slice length, if the CPU's load is at | |
569 | * least twice that of our own weight (i.e. dont track it | |
570 | * when there are only lesser-weight tasks around): | |
571 | */ | |
495eca49 | 572 | if (rq_of(cfs_rq)->load.weight >= 2*se->load.weight) { |
eba1ed4b IM |
573 | se->slice_max = max(se->slice_max, |
574 | se->sum_exec_runtime - se->prev_sum_exec_runtime); | |
575 | } | |
576 | #endif | |
4a55b450 | 577 | se->prev_sum_exec_runtime = se->sum_exec_runtime; |
bf0f6f24 IM |
578 | } |
579 | ||
9948f4b2 | 580 | static struct sched_entity *pick_next_entity(struct cfs_rq *cfs_rq) |
bf0f6f24 IM |
581 | { |
582 | struct sched_entity *se = __pick_next_entity(cfs_rq); | |
583 | ||
8494f412 | 584 | set_next_entity(cfs_rq, se); |
bf0f6f24 IM |
585 | |
586 | return se; | |
587 | } | |
588 | ||
ab6cde26 | 589 | static void put_prev_entity(struct cfs_rq *cfs_rq, struct sched_entity *prev) |
bf0f6f24 IM |
590 | { |
591 | /* | |
592 | * If still on the runqueue then deactivate_task() | |
593 | * was not called and update_curr() has to be done: | |
594 | */ | |
595 | if (prev->on_rq) | |
b7cc0896 | 596 | update_curr(cfs_rq); |
bf0f6f24 | 597 | |
c7e9b5b2 | 598 | update_stats_curr_end(cfs_rq, prev); |
bf0f6f24 | 599 | |
ddc97297 | 600 | check_spread(cfs_rq, prev); |
30cfdcfc | 601 | if (prev->on_rq) { |
5870db5b | 602 | update_stats_wait_start(cfs_rq, prev); |
30cfdcfc DA |
603 | /* Put 'current' back into the tree. */ |
604 | __enqueue_entity(cfs_rq, prev); | |
605 | } | |
429d43bc | 606 | cfs_rq->curr = NULL; |
bf0f6f24 IM |
607 | } |
608 | ||
609 | static void entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr) | |
610 | { | |
bf0f6f24 | 611 | /* |
30cfdcfc | 612 | * Update run-time statistics of the 'current'. |
bf0f6f24 | 613 | */ |
30cfdcfc | 614 | update_curr(cfs_rq); |
bf0f6f24 | 615 | |
2e09bf55 IM |
616 | if (cfs_rq->nr_running > 1) |
617 | check_preempt_tick(cfs_rq, curr); | |
bf0f6f24 IM |
618 | } |
619 | ||
620 | /************************************************** | |
621 | * CFS operations on tasks: | |
622 | */ | |
623 | ||
624 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
625 | ||
626 | /* Walk up scheduling entities hierarchy */ | |
627 | #define for_each_sched_entity(se) \ | |
628 | for (; se; se = se->parent) | |
629 | ||
630 | static inline struct cfs_rq *task_cfs_rq(struct task_struct *p) | |
631 | { | |
632 | return p->se.cfs_rq; | |
633 | } | |
634 | ||
635 | /* runqueue on which this entity is (to be) queued */ | |
636 | static inline struct cfs_rq *cfs_rq_of(struct sched_entity *se) | |
637 | { | |
638 | return se->cfs_rq; | |
639 | } | |
640 | ||
641 | /* runqueue "owned" by this group */ | |
642 | static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp) | |
643 | { | |
644 | return grp->my_q; | |
645 | } | |
646 | ||
647 | /* Given a group's cfs_rq on one cpu, return its corresponding cfs_rq on | |
648 | * another cpu ('this_cpu') | |
649 | */ | |
650 | static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu) | |
651 | { | |
29f59db3 | 652 | return cfs_rq->tg->cfs_rq[this_cpu]; |
bf0f6f24 IM |
653 | } |
654 | ||
655 | /* Iterate thr' all leaf cfs_rq's on a runqueue */ | |
656 | #define for_each_leaf_cfs_rq(rq, cfs_rq) \ | |
657 | list_for_each_entry(cfs_rq, &rq->leaf_cfs_rq_list, leaf_cfs_rq_list) | |
658 | ||
659 | /* Do the two (enqueued) tasks belong to the same group ? */ | |
660 | static inline int is_same_group(struct task_struct *curr, struct task_struct *p) | |
661 | { | |
662 | if (curr->se.cfs_rq == p->se.cfs_rq) | |
663 | return 1; | |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
668 | #else /* CONFIG_FAIR_GROUP_SCHED */ | |
669 | ||
670 | #define for_each_sched_entity(se) \ | |
671 | for (; se; se = NULL) | |
672 | ||
673 | static inline struct cfs_rq *task_cfs_rq(struct task_struct *p) | |
674 | { | |
675 | return &task_rq(p)->cfs; | |
676 | } | |
677 | ||
678 | static inline struct cfs_rq *cfs_rq_of(struct sched_entity *se) | |
679 | { | |
680 | struct task_struct *p = task_of(se); | |
681 | struct rq *rq = task_rq(p); | |
682 | ||
683 | return &rq->cfs; | |
684 | } | |
685 | ||
686 | /* runqueue "owned" by this group */ | |
687 | static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp) | |
688 | { | |
689 | return NULL; | |
690 | } | |
691 | ||
692 | static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu) | |
693 | { | |
694 | return &cpu_rq(this_cpu)->cfs; | |
695 | } | |
696 | ||
697 | #define for_each_leaf_cfs_rq(rq, cfs_rq) \ | |
698 | for (cfs_rq = &rq->cfs; cfs_rq; cfs_rq = NULL) | |
699 | ||
700 | static inline int is_same_group(struct task_struct *curr, struct task_struct *p) | |
701 | { | |
702 | return 1; | |
703 | } | |
704 | ||
705 | #endif /* CONFIG_FAIR_GROUP_SCHED */ | |
706 | ||
707 | /* | |
708 | * The enqueue_task method is called before nr_running is | |
709 | * increased. Here we update the fair scheduling stats and | |
710 | * then put the task into the rbtree: | |
711 | */ | |
fd390f6a | 712 | static void enqueue_task_fair(struct rq *rq, struct task_struct *p, int wakeup) |
bf0f6f24 IM |
713 | { |
714 | struct cfs_rq *cfs_rq; | |
715 | struct sched_entity *se = &p->se; | |
716 | ||
717 | for_each_sched_entity(se) { | |
718 | if (se->on_rq) | |
719 | break; | |
720 | cfs_rq = cfs_rq_of(se); | |
83b699ed | 721 | enqueue_entity(cfs_rq, se, wakeup); |
bf0f6f24 IM |
722 | } |
723 | } | |
724 | ||
725 | /* | |
726 | * The dequeue_task method is called before nr_running is | |
727 | * decreased. We remove the task from the rbtree and | |
728 | * update the fair scheduling stats: | |
729 | */ | |
f02231e5 | 730 | static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int sleep) |
bf0f6f24 IM |
731 | { |
732 | struct cfs_rq *cfs_rq; | |
733 | struct sched_entity *se = &p->se; | |
734 | ||
735 | for_each_sched_entity(se) { | |
736 | cfs_rq = cfs_rq_of(se); | |
525c2716 | 737 | dequeue_entity(cfs_rq, se, sleep); |
bf0f6f24 IM |
738 | /* Don't dequeue parent if it has other entities besides us */ |
739 | if (cfs_rq->load.weight) | |
740 | break; | |
741 | } | |
742 | } | |
743 | ||
744 | /* | |
1799e35d IM |
745 | * sched_yield() support is very simple - we dequeue and enqueue. |
746 | * | |
747 | * If compat_yield is turned on then we requeue to the end of the tree. | |
bf0f6f24 | 748 | */ |
4530d7ab | 749 | static void yield_task_fair(struct rq *rq) |
bf0f6f24 | 750 | { |
72ea22f8 | 751 | struct cfs_rq *cfs_rq = task_cfs_rq(rq->curr); |
1799e35d | 752 | struct rb_node **link = &cfs_rq->tasks_timeline.rb_node; |
4530d7ab | 753 | struct sched_entity *rightmost, *se = &rq->curr->se; |
1799e35d | 754 | struct rb_node *parent; |
bf0f6f24 IM |
755 | |
756 | /* | |
1799e35d IM |
757 | * Are we the only task in the tree? |
758 | */ | |
759 | if (unlikely(cfs_rq->nr_running == 1)) | |
760 | return; | |
761 | ||
762 | if (likely(!sysctl_sched_compat_yield)) { | |
763 | __update_rq_clock(rq); | |
764 | /* | |
765 | * Dequeue and enqueue the task to update its | |
766 | * position within the tree: | |
767 | */ | |
4530d7ab | 768 | dequeue_entity(cfs_rq, se, 0); |
83b699ed | 769 | enqueue_entity(cfs_rq, se, 0); |
1799e35d IM |
770 | |
771 | return; | |
772 | } | |
773 | /* | |
774 | * Find the rightmost entry in the rbtree: | |
bf0f6f24 | 775 | */ |
1799e35d IM |
776 | do { |
777 | parent = *link; | |
778 | link = &parent->rb_right; | |
779 | } while (*link); | |
780 | ||
781 | rightmost = rb_entry(parent, struct sched_entity, run_node); | |
782 | /* | |
783 | * Already in the rightmost position? | |
784 | */ | |
785 | if (unlikely(rightmost == se)) | |
786 | return; | |
787 | ||
788 | /* | |
789 | * Minimally necessary key value to be last in the tree: | |
790 | */ | |
30cfdcfc | 791 | se->vruntime = rightmost->vruntime + 1; |
1799e35d IM |
792 | |
793 | if (cfs_rq->rb_leftmost == &se->run_node) | |
794 | cfs_rq->rb_leftmost = rb_next(&se->run_node); | |
795 | /* | |
796 | * Relink the task to the rightmost position: | |
797 | */ | |
798 | rb_erase(&se->run_node, &cfs_rq->tasks_timeline); | |
799 | rb_link_node(&se->run_node, parent, link); | |
800 | rb_insert_color(&se->run_node, &cfs_rq->tasks_timeline); | |
bf0f6f24 IM |
801 | } |
802 | ||
803 | /* | |
804 | * Preempt the current task with a newly woken task if needed: | |
805 | */ | |
2e09bf55 | 806 | static void check_preempt_wakeup(struct rq *rq, struct task_struct *p) |
bf0f6f24 IM |
807 | { |
808 | struct task_struct *curr = rq->curr; | |
809 | struct cfs_rq *cfs_rq = task_cfs_rq(curr); | |
bf0f6f24 IM |
810 | |
811 | if (unlikely(rt_prio(p->prio))) { | |
a8e504d2 | 812 | update_rq_clock(rq); |
b7cc0896 | 813 | update_curr(cfs_rq); |
bf0f6f24 IM |
814 | resched_task(curr); |
815 | return; | |
816 | } | |
2e09bf55 IM |
817 | if (is_same_group(curr, p)) { |
818 | s64 delta = curr->se.vruntime - p->se.vruntime; | |
bf0f6f24 | 819 | |
2e09bf55 IM |
820 | if (delta > (s64)sysctl_sched_wakeup_granularity) |
821 | resched_task(curr); | |
822 | } | |
bf0f6f24 IM |
823 | } |
824 | ||
fb8d4724 | 825 | static struct task_struct *pick_next_task_fair(struct rq *rq) |
bf0f6f24 IM |
826 | { |
827 | struct cfs_rq *cfs_rq = &rq->cfs; | |
828 | struct sched_entity *se; | |
829 | ||
830 | if (unlikely(!cfs_rq->nr_running)) | |
831 | return NULL; | |
832 | ||
833 | do { | |
9948f4b2 | 834 | se = pick_next_entity(cfs_rq); |
bf0f6f24 IM |
835 | cfs_rq = group_cfs_rq(se); |
836 | } while (cfs_rq); | |
837 | ||
838 | return task_of(se); | |
839 | } | |
840 | ||
841 | /* | |
842 | * Account for a descheduled task: | |
843 | */ | |
31ee529c | 844 | static void put_prev_task_fair(struct rq *rq, struct task_struct *prev) |
bf0f6f24 IM |
845 | { |
846 | struct sched_entity *se = &prev->se; | |
847 | struct cfs_rq *cfs_rq; | |
848 | ||
849 | for_each_sched_entity(se) { | |
850 | cfs_rq = cfs_rq_of(se); | |
ab6cde26 | 851 | put_prev_entity(cfs_rq, se); |
bf0f6f24 IM |
852 | } |
853 | } | |
854 | ||
855 | /************************************************** | |
856 | * Fair scheduling class load-balancing methods: | |
857 | */ | |
858 | ||
859 | /* | |
860 | * Load-balancing iterator. Note: while the runqueue stays locked | |
861 | * during the whole iteration, the current task might be | |
862 | * dequeued so the iterator has to be dequeue-safe. Here we | |
863 | * achieve that by always pre-iterating before returning | |
864 | * the current task: | |
865 | */ | |
866 | static inline struct task_struct * | |
867 | __load_balance_iterator(struct cfs_rq *cfs_rq, struct rb_node *curr) | |
868 | { | |
869 | struct task_struct *p; | |
870 | ||
871 | if (!curr) | |
872 | return NULL; | |
873 | ||
874 | p = rb_entry(curr, struct task_struct, se.run_node); | |
875 | cfs_rq->rb_load_balance_curr = rb_next(curr); | |
876 | ||
877 | return p; | |
878 | } | |
879 | ||
880 | static struct task_struct *load_balance_start_fair(void *arg) | |
881 | { | |
882 | struct cfs_rq *cfs_rq = arg; | |
883 | ||
884 | return __load_balance_iterator(cfs_rq, first_fair(cfs_rq)); | |
885 | } | |
886 | ||
887 | static struct task_struct *load_balance_next_fair(void *arg) | |
888 | { | |
889 | struct cfs_rq *cfs_rq = arg; | |
890 | ||
891 | return __load_balance_iterator(cfs_rq, cfs_rq->rb_load_balance_curr); | |
892 | } | |
893 | ||
a4ac01c3 | 894 | #ifdef CONFIG_FAIR_GROUP_SCHED |
bf0f6f24 IM |
895 | static int cfs_rq_best_prio(struct cfs_rq *cfs_rq) |
896 | { | |
897 | struct sched_entity *curr; | |
898 | struct task_struct *p; | |
899 | ||
900 | if (!cfs_rq->nr_running) | |
901 | return MAX_PRIO; | |
902 | ||
9b5b7751 SV |
903 | curr = cfs_rq->curr; |
904 | if (!curr) | |
905 | curr = __pick_next_entity(cfs_rq); | |
906 | ||
bf0f6f24 IM |
907 | p = task_of(curr); |
908 | ||
909 | return p->prio; | |
910 | } | |
a4ac01c3 | 911 | #endif |
bf0f6f24 | 912 | |
43010659 | 913 | static unsigned long |
bf0f6f24 | 914 | load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest, |
a4ac01c3 PW |
915 | unsigned long max_nr_move, unsigned long max_load_move, |
916 | struct sched_domain *sd, enum cpu_idle_type idle, | |
917 | int *all_pinned, int *this_best_prio) | |
bf0f6f24 IM |
918 | { |
919 | struct cfs_rq *busy_cfs_rq; | |
920 | unsigned long load_moved, total_nr_moved = 0, nr_moved; | |
921 | long rem_load_move = max_load_move; | |
922 | struct rq_iterator cfs_rq_iterator; | |
923 | ||
924 | cfs_rq_iterator.start = load_balance_start_fair; | |
925 | cfs_rq_iterator.next = load_balance_next_fair; | |
926 | ||
927 | for_each_leaf_cfs_rq(busiest, busy_cfs_rq) { | |
a4ac01c3 | 928 | #ifdef CONFIG_FAIR_GROUP_SCHED |
bf0f6f24 | 929 | struct cfs_rq *this_cfs_rq; |
e56f31aa | 930 | long imbalance; |
bf0f6f24 | 931 | unsigned long maxload; |
bf0f6f24 IM |
932 | |
933 | this_cfs_rq = cpu_cfs_rq(busy_cfs_rq, this_cpu); | |
934 | ||
e56f31aa | 935 | imbalance = busy_cfs_rq->load.weight - this_cfs_rq->load.weight; |
bf0f6f24 IM |
936 | /* Don't pull if this_cfs_rq has more load than busy_cfs_rq */ |
937 | if (imbalance <= 0) | |
938 | continue; | |
939 | ||
940 | /* Don't pull more than imbalance/2 */ | |
941 | imbalance /= 2; | |
942 | maxload = min(rem_load_move, imbalance); | |
943 | ||
a4ac01c3 PW |
944 | *this_best_prio = cfs_rq_best_prio(this_cfs_rq); |
945 | #else | |
e56f31aa | 946 | # define maxload rem_load_move |
a4ac01c3 | 947 | #endif |
bf0f6f24 IM |
948 | /* pass busy_cfs_rq argument into |
949 | * load_balance_[start|next]_fair iterators | |
950 | */ | |
951 | cfs_rq_iterator.arg = busy_cfs_rq; | |
952 | nr_moved = balance_tasks(this_rq, this_cpu, busiest, | |
953 | max_nr_move, maxload, sd, idle, all_pinned, | |
a4ac01c3 | 954 | &load_moved, this_best_prio, &cfs_rq_iterator); |
bf0f6f24 IM |
955 | |
956 | total_nr_moved += nr_moved; | |
957 | max_nr_move -= nr_moved; | |
958 | rem_load_move -= load_moved; | |
959 | ||
960 | if (max_nr_move <= 0 || rem_load_move <= 0) | |
961 | break; | |
962 | } | |
963 | ||
43010659 | 964 | return max_load_move - rem_load_move; |
bf0f6f24 IM |
965 | } |
966 | ||
967 | /* | |
968 | * scheduler tick hitting a task of our scheduling class: | |
969 | */ | |
970 | static void task_tick_fair(struct rq *rq, struct task_struct *curr) | |
971 | { | |
972 | struct cfs_rq *cfs_rq; | |
973 | struct sched_entity *se = &curr->se; | |
974 | ||
975 | for_each_sched_entity(se) { | |
976 | cfs_rq = cfs_rq_of(se); | |
977 | entity_tick(cfs_rq, se); | |
978 | } | |
979 | } | |
980 | ||
4d78e7b6 PZ |
981 | #define swap(a,b) do { typeof(a) tmp = (a); (a) = (b); (b) = tmp; } while (0) |
982 | ||
bf0f6f24 IM |
983 | /* |
984 | * Share the fairness runtime between parent and child, thus the | |
985 | * total amount of pressure for CPU stays equal - new tasks | |
986 | * get a chance to run but frequent forkers are not allowed to | |
987 | * monopolize the CPU. Note: the parent runqueue is locked, | |
988 | * the child is not running yet. | |
989 | */ | |
ee0827d8 | 990 | static void task_new_fair(struct rq *rq, struct task_struct *p) |
bf0f6f24 IM |
991 | { |
992 | struct cfs_rq *cfs_rq = task_cfs_rq(p); | |
429d43bc | 993 | struct sched_entity *se = &p->se, *curr = cfs_rq->curr; |
bf0f6f24 IM |
994 | |
995 | sched_info_queued(p); | |
996 | ||
7109c442 | 997 | update_curr(cfs_rq); |
aeb73b04 | 998 | place_entity(cfs_rq, se, 1); |
4d78e7b6 | 999 | |
4d78e7b6 PZ |
1000 | if (sysctl_sched_child_runs_first && |
1001 | curr->vruntime < se->vruntime) { | |
87fefa38 | 1002 | /* |
edcb60a3 IM |
1003 | * Upon rescheduling, sched_class::put_prev_task() will place |
1004 | * 'current' within the tree based on its new key value. | |
1005 | */ | |
4d78e7b6 | 1006 | swap(curr->vruntime, se->vruntime); |
4d78e7b6 | 1007 | } |
bf0f6f24 | 1008 | |
e9acbff6 | 1009 | update_stats_enqueue(cfs_rq, se); |
ddc97297 PZ |
1010 | check_spread(cfs_rq, se); |
1011 | check_spread(cfs_rq, curr); | |
bf0f6f24 | 1012 | __enqueue_entity(cfs_rq, se); |
30cfdcfc | 1013 | account_entity_enqueue(cfs_rq, se); |
bb61c210 | 1014 | resched_task(rq->curr); |
bf0f6f24 IM |
1015 | } |
1016 | ||
83b699ed SV |
1017 | /* Account for a task changing its policy or group. |
1018 | * | |
1019 | * This routine is mostly called to set cfs_rq->curr field when a task | |
1020 | * migrates between groups/classes. | |
1021 | */ | |
1022 | static void set_curr_task_fair(struct rq *rq) | |
1023 | { | |
1024 | struct sched_entity *se = &rq->curr->se; | |
1025 | ||
1026 | for_each_sched_entity(se) | |
1027 | set_next_entity(cfs_rq_of(se), se); | |
1028 | } | |
1029 | ||
bf0f6f24 IM |
1030 | /* |
1031 | * All the scheduling class methods: | |
1032 | */ | |
1033 | struct sched_class fair_sched_class __read_mostly = { | |
1034 | .enqueue_task = enqueue_task_fair, | |
1035 | .dequeue_task = dequeue_task_fair, | |
1036 | .yield_task = yield_task_fair, | |
1037 | ||
2e09bf55 | 1038 | .check_preempt_curr = check_preempt_wakeup, |
bf0f6f24 IM |
1039 | |
1040 | .pick_next_task = pick_next_task_fair, | |
1041 | .put_prev_task = put_prev_task_fair, | |
1042 | ||
1043 | .load_balance = load_balance_fair, | |
1044 | ||
83b699ed | 1045 | .set_curr_task = set_curr_task_fair, |
bf0f6f24 IM |
1046 | .task_tick = task_tick_fair, |
1047 | .task_new = task_new_fair, | |
1048 | }; | |
1049 | ||
1050 | #ifdef CONFIG_SCHED_DEBUG | |
5cef9eca | 1051 | static void print_cfs_stats(struct seq_file *m, int cpu) |
bf0f6f24 | 1052 | { |
bf0f6f24 IM |
1053 | struct cfs_rq *cfs_rq; |
1054 | ||
75c28ace SV |
1055 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1056 | print_cfs_rq(m, cpu, &cpu_rq(cpu)->cfs); | |
1057 | #endif | |
c3b64f1e | 1058 | for_each_leaf_cfs_rq(cpu_rq(cpu), cfs_rq) |
5cef9eca | 1059 | print_cfs_rq(m, cpu, cfs_rq); |
bf0f6f24 IM |
1060 | } |
1061 | #endif |