Commit | Line | Data |
---|---|---|
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 | */ | |
5f6d858e | 49 | const_debug unsigned int sysctl_sched_nr_latency = 20; |
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 | /************************************************************** |
80 | * CFS operations on generic schedulable entities: | |
81 | */ | |
82 | ||
62160e3f | 83 | #ifdef CONFIG_FAIR_GROUP_SCHED |
bf0f6f24 | 84 | |
62160e3f | 85 | /* cpu runqueue to which this cfs_rq is attached */ |
bf0f6f24 IM |
86 | static inline struct rq *rq_of(struct cfs_rq *cfs_rq) |
87 | { | |
62160e3f | 88 | return cfs_rq->rq; |
bf0f6f24 IM |
89 | } |
90 | ||
62160e3f IM |
91 | /* An entity is a task if it doesn't "own" a runqueue */ |
92 | #define entity_is_task(se) (!se->my_q) | |
bf0f6f24 | 93 | |
62160e3f | 94 | #else /* CONFIG_FAIR_GROUP_SCHED */ |
bf0f6f24 | 95 | |
62160e3f IM |
96 | static inline struct rq *rq_of(struct cfs_rq *cfs_rq) |
97 | { | |
98 | return container_of(cfs_rq, struct rq, cfs); | |
bf0f6f24 IM |
99 | } |
100 | ||
101 | #define entity_is_task(se) 1 | |
102 | ||
bf0f6f24 IM |
103 | #endif /* CONFIG_FAIR_GROUP_SCHED */ |
104 | ||
105 | static inline struct task_struct *task_of(struct sched_entity *se) | |
106 | { | |
107 | return container_of(se, struct task_struct, se); | |
108 | } | |
109 | ||
110 | ||
111 | /************************************************************** | |
112 | * Scheduling class tree data structure manipulation methods: | |
113 | */ | |
114 | ||
02e0431a PZ |
115 | static inline u64 |
116 | max_vruntime(u64 min_vruntime, u64 vruntime) | |
117 | { | |
368059a9 PZ |
118 | s64 delta = (s64)(vruntime - min_vruntime); |
119 | if (delta > 0) | |
02e0431a PZ |
120 | min_vruntime = vruntime; |
121 | ||
122 | return min_vruntime; | |
123 | } | |
124 | ||
b0ffd246 PZ |
125 | static inline u64 |
126 | min_vruntime(u64 min_vruntime, u64 vruntime) | |
127 | { | |
128 | s64 delta = (s64)(vruntime - min_vruntime); | |
129 | if (delta < 0) | |
130 | min_vruntime = vruntime; | |
131 | ||
132 | return min_vruntime; | |
133 | } | |
134 | ||
02e0431a PZ |
135 | static inline s64 |
136 | entity_key(struct cfs_rq *cfs_rq, struct sched_entity *se) | |
9014623c | 137 | { |
30cfdcfc | 138 | return se->vruntime - cfs_rq->min_vruntime; |
9014623c PZ |
139 | } |
140 | ||
bf0f6f24 IM |
141 | /* |
142 | * Enqueue an entity into the rb-tree: | |
143 | */ | |
19ccd97a | 144 | static void |
bf0f6f24 IM |
145 | __enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se) |
146 | { | |
147 | struct rb_node **link = &cfs_rq->tasks_timeline.rb_node; | |
148 | struct rb_node *parent = NULL; | |
149 | struct sched_entity *entry; | |
9014623c | 150 | s64 key = entity_key(cfs_rq, se); |
bf0f6f24 IM |
151 | int leftmost = 1; |
152 | ||
153 | /* | |
154 | * Find the right place in the rbtree: | |
155 | */ | |
156 | while (*link) { | |
157 | parent = *link; | |
158 | entry = rb_entry(parent, struct sched_entity, run_node); | |
159 | /* | |
160 | * We dont care about collisions. Nodes with | |
161 | * the same key stay together. | |
162 | */ | |
9014623c | 163 | if (key < entity_key(cfs_rq, entry)) { |
bf0f6f24 IM |
164 | link = &parent->rb_left; |
165 | } else { | |
166 | link = &parent->rb_right; | |
167 | leftmost = 0; | |
168 | } | |
169 | } | |
170 | ||
171 | /* | |
172 | * Maintain a cache of leftmost tree entries (it is frequently | |
173 | * used): | |
174 | */ | |
175 | if (leftmost) | |
57cb499d | 176 | cfs_rq->rb_leftmost = &se->run_node; |
bf0f6f24 IM |
177 | |
178 | rb_link_node(&se->run_node, parent, link); | |
179 | rb_insert_color(&se->run_node, &cfs_rq->tasks_timeline); | |
bf0f6f24 IM |
180 | } |
181 | ||
19ccd97a | 182 | static void |
bf0f6f24 IM |
183 | __dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se) |
184 | { | |
185 | if (cfs_rq->rb_leftmost == &se->run_node) | |
57cb499d | 186 | cfs_rq->rb_leftmost = rb_next(&se->run_node); |
e9acbff6 | 187 | |
bf0f6f24 | 188 | rb_erase(&se->run_node, &cfs_rq->tasks_timeline); |
bf0f6f24 IM |
189 | } |
190 | ||
191 | static inline struct rb_node *first_fair(struct cfs_rq *cfs_rq) | |
192 | { | |
193 | return cfs_rq->rb_leftmost; | |
194 | } | |
195 | ||
196 | static struct sched_entity *__pick_next_entity(struct cfs_rq *cfs_rq) | |
197 | { | |
198 | return rb_entry(first_fair(cfs_rq), struct sched_entity, run_node); | |
199 | } | |
200 | ||
aeb73b04 PZ |
201 | static inline struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq) |
202 | { | |
203 | struct rb_node **link = &cfs_rq->tasks_timeline.rb_node; | |
204 | struct sched_entity *se = NULL; | |
205 | struct rb_node *parent; | |
206 | ||
207 | while (*link) { | |
208 | parent = *link; | |
209 | se = rb_entry(parent, struct sched_entity, run_node); | |
210 | link = &parent->rb_right; | |
211 | } | |
212 | ||
213 | return se; | |
214 | } | |
215 | ||
bf0f6f24 IM |
216 | /************************************************************** |
217 | * Scheduling class statistics methods: | |
218 | */ | |
219 | ||
4d78e7b6 PZ |
220 | static u64 __sched_period(unsigned long nr_running) |
221 | { | |
222 | u64 period = sysctl_sched_latency; | |
5f6d858e | 223 | unsigned long nr_latency = sysctl_sched_nr_latency; |
4d78e7b6 PZ |
224 | |
225 | if (unlikely(nr_running > nr_latency)) { | |
226 | period *= nr_running; | |
227 | do_div(period, nr_latency); | |
228 | } | |
229 | ||
230 | return period; | |
231 | } | |
232 | ||
6d0f0ebd | 233 | static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se) |
21805085 | 234 | { |
6d0f0ebd | 235 | u64 period = __sched_period(cfs_rq->nr_running); |
21805085 | 236 | |
6d0f0ebd PZ |
237 | period *= se->load.weight; |
238 | do_div(period, cfs_rq->load.weight); | |
21805085 | 239 | |
6d0f0ebd | 240 | return period; |
bf0f6f24 IM |
241 | } |
242 | ||
67e9fb2a PZ |
243 | static u64 __sched_vslice(unsigned long nr_running) |
244 | { | |
5f6d858e PZ |
245 | unsigned long period = sysctl_sched_latency; |
246 | unsigned long nr_latency = sysctl_sched_nr_latency; | |
67e9fb2a | 247 | |
5f6d858e PZ |
248 | if (unlikely(nr_running > nr_latency)) |
249 | nr_running = nr_latency; | |
67e9fb2a | 250 | |
5f6d858e PZ |
251 | period /= nr_running; |
252 | ||
253 | return (u64)period; | |
67e9fb2a PZ |
254 | } |
255 | ||
bf0f6f24 IM |
256 | /* |
257 | * Update the current task's runtime statistics. Skip current tasks that | |
258 | * are not in our scheduling class. | |
259 | */ | |
260 | static inline void | |
8ebc91d9 IM |
261 | __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr, |
262 | unsigned long delta_exec) | |
bf0f6f24 | 263 | { |
bbdba7c0 | 264 | unsigned long delta_exec_weighted; |
b0ffd246 | 265 | u64 vruntime; |
bf0f6f24 | 266 | |
8179ca23 | 267 | schedstat_set(curr->exec_max, max((u64)delta_exec, curr->exec_max)); |
bf0f6f24 IM |
268 | |
269 | curr->sum_exec_runtime += delta_exec; | |
7a62eabc | 270 | schedstat_add(cfs_rq, exec_clock, delta_exec); |
e9acbff6 IM |
271 | delta_exec_weighted = delta_exec; |
272 | if (unlikely(curr->load.weight != NICE_0_LOAD)) { | |
273 | delta_exec_weighted = calc_delta_fair(delta_exec_weighted, | |
274 | &curr->load); | |
275 | } | |
276 | curr->vruntime += delta_exec_weighted; | |
02e0431a PZ |
277 | |
278 | /* | |
279 | * maintain cfs_rq->min_vruntime to be a monotonic increasing | |
280 | * value tracking the leftmost vruntime in the tree. | |
281 | */ | |
282 | if (first_fair(cfs_rq)) { | |
b0ffd246 PZ |
283 | vruntime = min_vruntime(curr->vruntime, |
284 | __pick_next_entity(cfs_rq)->vruntime); | |
02e0431a | 285 | } else |
b0ffd246 | 286 | vruntime = curr->vruntime; |
02e0431a PZ |
287 | |
288 | cfs_rq->min_vruntime = | |
b0ffd246 | 289 | max_vruntime(cfs_rq->min_vruntime, vruntime); |
bf0f6f24 IM |
290 | } |
291 | ||
b7cc0896 | 292 | static void update_curr(struct cfs_rq *cfs_rq) |
bf0f6f24 | 293 | { |
429d43bc | 294 | struct sched_entity *curr = cfs_rq->curr; |
8ebc91d9 | 295 | u64 now = rq_of(cfs_rq)->clock; |
bf0f6f24 IM |
296 | unsigned long delta_exec; |
297 | ||
298 | if (unlikely(!curr)) | |
299 | return; | |
300 | ||
301 | /* | |
302 | * Get the amount of time the current task was running | |
303 | * since the last time we changed load (this cannot | |
304 | * overflow on 32 bits): | |
305 | */ | |
8ebc91d9 | 306 | delta_exec = (unsigned long)(now - curr->exec_start); |
bf0f6f24 | 307 | |
8ebc91d9 IM |
308 | __update_curr(cfs_rq, curr, delta_exec); |
309 | curr->exec_start = now; | |
bf0f6f24 IM |
310 | } |
311 | ||
312 | static inline void | |
5870db5b | 313 | update_stats_wait_start(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 | 314 | { |
d281918d | 315 | schedstat_set(se->wait_start, rq_of(cfs_rq)->clock); |
bf0f6f24 IM |
316 | } |
317 | ||
bf0f6f24 | 318 | static inline unsigned long |
08e2388a | 319 | calc_weighted(unsigned long delta, struct sched_entity *se) |
bf0f6f24 | 320 | { |
08e2388a | 321 | unsigned long weight = se->load.weight; |
bf0f6f24 | 322 | |
08e2388a IM |
323 | if (unlikely(weight != NICE_0_LOAD)) |
324 | return (u64)delta * se->load.weight >> NICE_0_SHIFT; | |
325 | else | |
326 | return delta; | |
bf0f6f24 | 327 | } |
bf0f6f24 IM |
328 | |
329 | /* | |
330 | * Task is being enqueued - update stats: | |
331 | */ | |
d2417e5a | 332 | static void update_stats_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 | 333 | { |
bf0f6f24 IM |
334 | /* |
335 | * Are we enqueueing a waiting task? (for current tasks | |
336 | * a dequeue/enqueue event is a NOP) | |
337 | */ | |
429d43bc | 338 | if (se != cfs_rq->curr) |
5870db5b | 339 | update_stats_wait_start(cfs_rq, se); |
bf0f6f24 IM |
340 | } |
341 | ||
bf0f6f24 | 342 | static void |
9ef0a961 | 343 | update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 | 344 | { |
bbdba7c0 IM |
345 | schedstat_set(se->wait_max, max(se->wait_max, |
346 | rq_of(cfs_rq)->clock - se->wait_start)); | |
6cfb0d5d | 347 | schedstat_set(se->wait_start, 0); |
bf0f6f24 IM |
348 | } |
349 | ||
350 | static inline void | |
19b6a2e3 | 351 | update_stats_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 | 352 | { |
b7cc0896 | 353 | update_curr(cfs_rq); |
bf0f6f24 IM |
354 | /* |
355 | * Mark the end of the wait period if dequeueing a | |
356 | * waiting task: | |
357 | */ | |
429d43bc | 358 | if (se != cfs_rq->curr) |
9ef0a961 | 359 | update_stats_wait_end(cfs_rq, se); |
bf0f6f24 IM |
360 | } |
361 | ||
362 | /* | |
363 | * We are picking a new current task - update its stats: | |
364 | */ | |
365 | static inline void | |
79303e9e | 366 | update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 IM |
367 | { |
368 | /* | |
369 | * We are starting a new run period: | |
370 | */ | |
d281918d | 371 | se->exec_start = rq_of(cfs_rq)->clock; |
bf0f6f24 IM |
372 | } |
373 | ||
374 | /* | |
375 | * We are descheduling a task - update its stats: | |
376 | */ | |
377 | static inline void | |
c7e9b5b2 | 378 | update_stats_curr_end(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 IM |
379 | { |
380 | se->exec_start = 0; | |
381 | } | |
382 | ||
383 | /************************************************** | |
384 | * Scheduling class queueing methods: | |
385 | */ | |
386 | ||
30cfdcfc DA |
387 | static void |
388 | account_entity_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se) | |
389 | { | |
390 | update_load_add(&cfs_rq->load, se->load.weight); | |
391 | cfs_rq->nr_running++; | |
392 | se->on_rq = 1; | |
393 | } | |
394 | ||
395 | static void | |
396 | account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se) | |
397 | { | |
398 | update_load_sub(&cfs_rq->load, se->load.weight); | |
399 | cfs_rq->nr_running--; | |
400 | se->on_rq = 0; | |
401 | } | |
402 | ||
2396af69 | 403 | static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 | 404 | { |
bf0f6f24 IM |
405 | #ifdef CONFIG_SCHEDSTATS |
406 | if (se->sleep_start) { | |
d281918d | 407 | u64 delta = rq_of(cfs_rq)->clock - se->sleep_start; |
bf0f6f24 IM |
408 | |
409 | if ((s64)delta < 0) | |
410 | delta = 0; | |
411 | ||
412 | if (unlikely(delta > se->sleep_max)) | |
413 | se->sleep_max = delta; | |
414 | ||
415 | se->sleep_start = 0; | |
416 | se->sum_sleep_runtime += delta; | |
417 | } | |
418 | if (se->block_start) { | |
d281918d | 419 | u64 delta = rq_of(cfs_rq)->clock - se->block_start; |
bf0f6f24 IM |
420 | |
421 | if ((s64)delta < 0) | |
422 | delta = 0; | |
423 | ||
424 | if (unlikely(delta > se->block_max)) | |
425 | se->block_max = delta; | |
426 | ||
427 | se->block_start = 0; | |
428 | se->sum_sleep_runtime += delta; | |
30084fbd IM |
429 | |
430 | /* | |
431 | * Blocking time is in units of nanosecs, so shift by 20 to | |
432 | * get a milliseconds-range estimation of the amount of | |
433 | * time that the task spent sleeping: | |
434 | */ | |
435 | if (unlikely(prof_on == SLEEP_PROFILING)) { | |
e22f5bbf IM |
436 | struct task_struct *tsk = task_of(se); |
437 | ||
30084fbd IM |
438 | profile_hits(SLEEP_PROFILING, (void *)get_wchan(tsk), |
439 | delta >> 20); | |
440 | } | |
bf0f6f24 IM |
441 | } |
442 | #endif | |
443 | } | |
444 | ||
ddc97297 PZ |
445 | static void check_spread(struct cfs_rq *cfs_rq, struct sched_entity *se) |
446 | { | |
447 | #ifdef CONFIG_SCHED_DEBUG | |
448 | s64 d = se->vruntime - cfs_rq->min_vruntime; | |
449 | ||
450 | if (d < 0) | |
451 | d = -d; | |
452 | ||
453 | if (d > 3*sysctl_sched_latency) | |
454 | schedstat_inc(cfs_rq, nr_spread_over); | |
455 | #endif | |
456 | } | |
457 | ||
aeb73b04 PZ |
458 | static void |
459 | place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial) | |
460 | { | |
67e9fb2a | 461 | u64 vruntime; |
aeb73b04 | 462 | |
67e9fb2a | 463 | vruntime = cfs_rq->min_vruntime; |
94dfb5e7 PZ |
464 | |
465 | if (sched_feat(USE_TREE_AVG)) { | |
466 | struct sched_entity *last = __pick_last_entity(cfs_rq); | |
467 | if (last) { | |
67e9fb2a PZ |
468 | vruntime += last->vruntime; |
469 | vruntime >>= 1; | |
94dfb5e7 | 470 | } |
67e9fb2a PZ |
471 | } else if (sched_feat(APPROX_AVG) && cfs_rq->nr_running) |
472 | vruntime += __sched_vslice(cfs_rq->nr_running)/2; | |
94dfb5e7 PZ |
473 | |
474 | if (initial && sched_feat(START_DEBIT)) | |
67e9fb2a | 475 | vruntime += __sched_vslice(cfs_rq->nr_running + 1); |
aeb73b04 | 476 | |
8465e792 | 477 | if (!initial) { |
94359f05 IM |
478 | if (sched_feat(NEW_FAIR_SLEEPERS)) |
479 | vruntime -= sysctl_sched_latency; | |
480 | ||
b8487b92 | 481 | vruntime = max_t(s64, vruntime, se->vruntime); |
aeb73b04 PZ |
482 | } |
483 | ||
67e9fb2a PZ |
484 | se->vruntime = vruntime; |
485 | ||
aeb73b04 PZ |
486 | } |
487 | ||
bf0f6f24 | 488 | static void |
83b699ed | 489 | enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int wakeup) |
bf0f6f24 IM |
490 | { |
491 | /* | |
492 | * Update the fair clock. | |
493 | */ | |
b7cc0896 | 494 | update_curr(cfs_rq); |
bf0f6f24 | 495 | |
e9acbff6 | 496 | if (wakeup) { |
aeb73b04 | 497 | place_entity(cfs_rq, se, 0); |
2396af69 | 498 | enqueue_sleeper(cfs_rq, se); |
e9acbff6 | 499 | } |
bf0f6f24 | 500 | |
d2417e5a | 501 | update_stats_enqueue(cfs_rq, se); |
ddc97297 | 502 | check_spread(cfs_rq, se); |
83b699ed SV |
503 | if (se != cfs_rq->curr) |
504 | __enqueue_entity(cfs_rq, se); | |
30cfdcfc | 505 | account_entity_enqueue(cfs_rq, se); |
bf0f6f24 IM |
506 | } |
507 | ||
508 | static void | |
525c2716 | 509 | dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int sleep) |
bf0f6f24 | 510 | { |
19b6a2e3 | 511 | update_stats_dequeue(cfs_rq, se); |
db36cc7d | 512 | if (sleep) { |
67e9fb2a | 513 | #ifdef CONFIG_SCHEDSTATS |
bf0f6f24 IM |
514 | if (entity_is_task(se)) { |
515 | struct task_struct *tsk = task_of(se); | |
516 | ||
517 | if (tsk->state & TASK_INTERRUPTIBLE) | |
d281918d | 518 | se->sleep_start = rq_of(cfs_rq)->clock; |
bf0f6f24 | 519 | if (tsk->state & TASK_UNINTERRUPTIBLE) |
d281918d | 520 | se->block_start = rq_of(cfs_rq)->clock; |
bf0f6f24 | 521 | } |
db36cc7d | 522 | #endif |
67e9fb2a PZ |
523 | } |
524 | ||
83b699ed | 525 | if (se != cfs_rq->curr) |
30cfdcfc DA |
526 | __dequeue_entity(cfs_rq, se); |
527 | account_entity_dequeue(cfs_rq, se); | |
bf0f6f24 IM |
528 | } |
529 | ||
530 | /* | |
531 | * Preempt the current task with a newly woken task if needed: | |
532 | */ | |
7c92e54f | 533 | static void |
2e09bf55 | 534 | check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr) |
bf0f6f24 | 535 | { |
11697830 PZ |
536 | unsigned long ideal_runtime, delta_exec; |
537 | ||
6d0f0ebd | 538 | ideal_runtime = sched_slice(cfs_rq, curr); |
11697830 PZ |
539 | delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime; |
540 | if (delta_exec > ideal_runtime) | |
bf0f6f24 IM |
541 | resched_task(rq_of(cfs_rq)->curr); |
542 | } | |
543 | ||
83b699ed | 544 | static void |
8494f412 | 545 | set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se) |
bf0f6f24 | 546 | { |
83b699ed SV |
547 | /* 'current' is not kept within the tree. */ |
548 | if (se->on_rq) { | |
549 | /* | |
550 | * Any task has to be enqueued before it get to execute on | |
551 | * a CPU. So account for the time it spent waiting on the | |
552 | * runqueue. | |
553 | */ | |
554 | update_stats_wait_end(cfs_rq, se); | |
555 | __dequeue_entity(cfs_rq, se); | |
556 | } | |
557 | ||
79303e9e | 558 | update_stats_curr_start(cfs_rq, se); |
429d43bc | 559 | cfs_rq->curr = se; |
eba1ed4b IM |
560 | #ifdef CONFIG_SCHEDSTATS |
561 | /* | |
562 | * Track our maximum slice length, if the CPU's load is at | |
563 | * least twice that of our own weight (i.e. dont track it | |
564 | * when there are only lesser-weight tasks around): | |
565 | */ | |
495eca49 | 566 | if (rq_of(cfs_rq)->load.weight >= 2*se->load.weight) { |
eba1ed4b IM |
567 | se->slice_max = max(se->slice_max, |
568 | se->sum_exec_runtime - se->prev_sum_exec_runtime); | |
569 | } | |
570 | #endif | |
4a55b450 | 571 | se->prev_sum_exec_runtime = se->sum_exec_runtime; |
bf0f6f24 IM |
572 | } |
573 | ||
9948f4b2 | 574 | static struct sched_entity *pick_next_entity(struct cfs_rq *cfs_rq) |
bf0f6f24 IM |
575 | { |
576 | struct sched_entity *se = __pick_next_entity(cfs_rq); | |
577 | ||
8494f412 | 578 | set_next_entity(cfs_rq, se); |
bf0f6f24 IM |
579 | |
580 | return se; | |
581 | } | |
582 | ||
ab6cde26 | 583 | static void put_prev_entity(struct cfs_rq *cfs_rq, struct sched_entity *prev) |
bf0f6f24 IM |
584 | { |
585 | /* | |
586 | * If still on the runqueue then deactivate_task() | |
587 | * was not called and update_curr() has to be done: | |
588 | */ | |
589 | if (prev->on_rq) | |
b7cc0896 | 590 | update_curr(cfs_rq); |
bf0f6f24 | 591 | |
c7e9b5b2 | 592 | update_stats_curr_end(cfs_rq, prev); |
bf0f6f24 | 593 | |
ddc97297 | 594 | check_spread(cfs_rq, prev); |
30cfdcfc | 595 | if (prev->on_rq) { |
5870db5b | 596 | update_stats_wait_start(cfs_rq, prev); |
30cfdcfc DA |
597 | /* Put 'current' back into the tree. */ |
598 | __enqueue_entity(cfs_rq, prev); | |
599 | } | |
429d43bc | 600 | cfs_rq->curr = NULL; |
bf0f6f24 IM |
601 | } |
602 | ||
603 | static void entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr) | |
604 | { | |
bf0f6f24 | 605 | /* |
30cfdcfc | 606 | * Update run-time statistics of the 'current'. |
bf0f6f24 | 607 | */ |
30cfdcfc | 608 | update_curr(cfs_rq); |
bf0f6f24 | 609 | |
2e09bf55 IM |
610 | if (cfs_rq->nr_running > 1) |
611 | check_preempt_tick(cfs_rq, curr); | |
bf0f6f24 IM |
612 | } |
613 | ||
614 | /************************************************** | |
615 | * CFS operations on tasks: | |
616 | */ | |
617 | ||
618 | #ifdef CONFIG_FAIR_GROUP_SCHED | |
619 | ||
620 | /* Walk up scheduling entities hierarchy */ | |
621 | #define for_each_sched_entity(se) \ | |
622 | for (; se; se = se->parent) | |
623 | ||
624 | static inline struct cfs_rq *task_cfs_rq(struct task_struct *p) | |
625 | { | |
626 | return p->se.cfs_rq; | |
627 | } | |
628 | ||
629 | /* runqueue on which this entity is (to be) queued */ | |
630 | static inline struct cfs_rq *cfs_rq_of(struct sched_entity *se) | |
631 | { | |
632 | return se->cfs_rq; | |
633 | } | |
634 | ||
635 | /* runqueue "owned" by this group */ | |
636 | static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp) | |
637 | { | |
638 | return grp->my_q; | |
639 | } | |
640 | ||
641 | /* Given a group's cfs_rq on one cpu, return its corresponding cfs_rq on | |
642 | * another cpu ('this_cpu') | |
643 | */ | |
644 | static inline struct cfs_rq *cpu_cfs_rq(struct cfs_rq *cfs_rq, int this_cpu) | |
645 | { | |
29f59db3 | 646 | return cfs_rq->tg->cfs_rq[this_cpu]; |
bf0f6f24 IM |
647 | } |
648 | ||
649 | /* Iterate thr' all leaf cfs_rq's on a runqueue */ | |
650 | #define for_each_leaf_cfs_rq(rq, cfs_rq) \ | |
651 | list_for_each_entry(cfs_rq, &rq->leaf_cfs_rq_list, leaf_cfs_rq_list) | |
652 | ||
fad095a7 SV |
653 | /* Do the two (enqueued) entities belong to the same group ? */ |
654 | static inline int | |
655 | is_same_group(struct sched_entity *se, struct sched_entity *pse) | |
bf0f6f24 | 656 | { |
fad095a7 | 657 | if (se->cfs_rq == pse->cfs_rq) |
bf0f6f24 IM |
658 | return 1; |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
fad095a7 SV |
663 | static inline struct sched_entity *parent_entity(struct sched_entity *se) |
664 | { | |
665 | return se->parent; | |
666 | } | |
667 | ||
bf0f6f24 IM |
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 | ||
fad095a7 SV |
700 | static inline int |
701 | is_same_group(struct sched_entity *se, struct sched_entity *pse) | |
bf0f6f24 IM |
702 | { |
703 | return 1; | |
704 | } | |
705 | ||
fad095a7 SV |
706 | static inline struct sched_entity *parent_entity(struct sched_entity *se) |
707 | { | |
708 | return NULL; | |
709 | } | |
710 | ||
bf0f6f24 IM |
711 | #endif /* CONFIG_FAIR_GROUP_SCHED */ |
712 | ||
713 | /* | |
714 | * The enqueue_task method is called before nr_running is | |
715 | * increased. Here we update the fair scheduling stats and | |
716 | * then put the task into the rbtree: | |
717 | */ | |
fd390f6a | 718 | static void enqueue_task_fair(struct rq *rq, struct task_struct *p, int wakeup) |
bf0f6f24 IM |
719 | { |
720 | struct cfs_rq *cfs_rq; | |
721 | struct sched_entity *se = &p->se; | |
722 | ||
723 | for_each_sched_entity(se) { | |
724 | if (se->on_rq) | |
725 | break; | |
726 | cfs_rq = cfs_rq_of(se); | |
83b699ed | 727 | enqueue_entity(cfs_rq, se, wakeup); |
b9fa3df3 | 728 | wakeup = 1; |
bf0f6f24 IM |
729 | } |
730 | } | |
731 | ||
732 | /* | |
733 | * The dequeue_task method is called before nr_running is | |
734 | * decreased. We remove the task from the rbtree and | |
735 | * update the fair scheduling stats: | |
736 | */ | |
f02231e5 | 737 | static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int sleep) |
bf0f6f24 IM |
738 | { |
739 | struct cfs_rq *cfs_rq; | |
740 | struct sched_entity *se = &p->se; | |
741 | ||
742 | for_each_sched_entity(se) { | |
743 | cfs_rq = cfs_rq_of(se); | |
525c2716 | 744 | dequeue_entity(cfs_rq, se, sleep); |
bf0f6f24 IM |
745 | /* Don't dequeue parent if it has other entities besides us */ |
746 | if (cfs_rq->load.weight) | |
747 | break; | |
b9fa3df3 | 748 | sleep = 1; |
bf0f6f24 IM |
749 | } |
750 | } | |
751 | ||
752 | /* | |
1799e35d IM |
753 | * sched_yield() support is very simple - we dequeue and enqueue. |
754 | * | |
755 | * If compat_yield is turned on then we requeue to the end of the tree. | |
bf0f6f24 | 756 | */ |
4530d7ab | 757 | static void yield_task_fair(struct rq *rq) |
bf0f6f24 | 758 | { |
72ea22f8 | 759 | struct cfs_rq *cfs_rq = task_cfs_rq(rq->curr); |
4530d7ab | 760 | struct sched_entity *rightmost, *se = &rq->curr->se; |
bf0f6f24 IM |
761 | |
762 | /* | |
1799e35d IM |
763 | * Are we the only task in the tree? |
764 | */ | |
765 | if (unlikely(cfs_rq->nr_running == 1)) | |
766 | return; | |
767 | ||
768 | if (likely(!sysctl_sched_compat_yield)) { | |
769 | __update_rq_clock(rq); | |
770 | /* | |
771 | * Dequeue and enqueue the task to update its | |
772 | * position within the tree: | |
773 | */ | |
2b1e315d | 774 | update_curr(cfs_rq); |
1799e35d IM |
775 | |
776 | return; | |
777 | } | |
778 | /* | |
779 | * Find the rightmost entry in the rbtree: | |
bf0f6f24 | 780 | */ |
2b1e315d | 781 | rightmost = __pick_last_entity(cfs_rq); |
1799e35d IM |
782 | /* |
783 | * Already in the rightmost position? | |
784 | */ | |
2b1e315d | 785 | if (unlikely(rightmost->vruntime < se->vruntime)) |
1799e35d IM |
786 | return; |
787 | ||
788 | /* | |
789 | * Minimally necessary key value to be last in the tree: | |
2b1e315d DA |
790 | * Upon rescheduling, sched_class::put_prev_task() will place |
791 | * 'current' within the tree based on its new key value. | |
1799e35d | 792 | */ |
30cfdcfc | 793 | se->vruntime = rightmost->vruntime + 1; |
bf0f6f24 IM |
794 | } |
795 | ||
796 | /* | |
797 | * Preempt the current task with a newly woken task if needed: | |
798 | */ | |
2e09bf55 | 799 | static void check_preempt_wakeup(struct rq *rq, struct task_struct *p) |
bf0f6f24 IM |
800 | { |
801 | struct task_struct *curr = rq->curr; | |
fad095a7 | 802 | struct cfs_rq *cfs_rq = task_cfs_rq(curr); |
8651a86c | 803 | struct sched_entity *se = &curr->se, *pse = &p->se; |
fad095a7 | 804 | s64 delta; |
bf0f6f24 IM |
805 | |
806 | if (unlikely(rt_prio(p->prio))) { | |
a8e504d2 | 807 | update_rq_clock(rq); |
b7cc0896 | 808 | update_curr(cfs_rq); |
bf0f6f24 IM |
809 | resched_task(curr); |
810 | return; | |
811 | } | |
812 | ||
fad095a7 SV |
813 | while (!is_same_group(se, pse)) { |
814 | se = parent_entity(se); | |
815 | pse = parent_entity(pse); | |
816 | } | |
8651a86c | 817 | |
fad095a7 | 818 | delta = se->vruntime - pse->vruntime; |
8651a86c | 819 | |
fad095a7 SV |
820 | if (delta > (s64)sysctl_sched_wakeup_granularity) |
821 | resched_task(curr); | |
bf0f6f24 IM |
822 | } |
823 | ||
fb8d4724 | 824 | static struct task_struct *pick_next_task_fair(struct rq *rq) |
bf0f6f24 IM |
825 | { |
826 | struct cfs_rq *cfs_rq = &rq->cfs; | |
827 | struct sched_entity *se; | |
828 | ||
829 | if (unlikely(!cfs_rq->nr_running)) | |
830 | return NULL; | |
831 | ||
832 | do { | |
9948f4b2 | 833 | se = pick_next_entity(cfs_rq); |
bf0f6f24 IM |
834 | cfs_rq = group_cfs_rq(se); |
835 | } while (cfs_rq); | |
836 | ||
837 | return task_of(se); | |
838 | } | |
839 | ||
840 | /* | |
841 | * Account for a descheduled task: | |
842 | */ | |
31ee529c | 843 | static void put_prev_task_fair(struct rq *rq, struct task_struct *prev) |
bf0f6f24 IM |
844 | { |
845 | struct sched_entity *se = &prev->se; | |
846 | struct cfs_rq *cfs_rq; | |
847 | ||
848 | for_each_sched_entity(se) { | |
849 | cfs_rq = cfs_rq_of(se); | |
ab6cde26 | 850 | put_prev_entity(cfs_rq, se); |
bf0f6f24 IM |
851 | } |
852 | } | |
853 | ||
854 | /************************************************** | |
855 | * Fair scheduling class load-balancing methods: | |
856 | */ | |
857 | ||
858 | /* | |
859 | * Load-balancing iterator. Note: while the runqueue stays locked | |
860 | * during the whole iteration, the current task might be | |
861 | * dequeued so the iterator has to be dequeue-safe. Here we | |
862 | * achieve that by always pre-iterating before returning | |
863 | * the current task: | |
864 | */ | |
865 | static inline struct task_struct * | |
866 | __load_balance_iterator(struct cfs_rq *cfs_rq, struct rb_node *curr) | |
867 | { | |
868 | struct task_struct *p; | |
869 | ||
870 | if (!curr) | |
871 | return NULL; | |
872 | ||
873 | p = rb_entry(curr, struct task_struct, se.run_node); | |
874 | cfs_rq->rb_load_balance_curr = rb_next(curr); | |
875 | ||
876 | return p; | |
877 | } | |
878 | ||
879 | static struct task_struct *load_balance_start_fair(void *arg) | |
880 | { | |
881 | struct cfs_rq *cfs_rq = arg; | |
882 | ||
883 | return __load_balance_iterator(cfs_rq, first_fair(cfs_rq)); | |
884 | } | |
885 | ||
886 | static struct task_struct *load_balance_next_fair(void *arg) | |
887 | { | |
888 | struct cfs_rq *cfs_rq = arg; | |
889 | ||
890 | return __load_balance_iterator(cfs_rq, cfs_rq->rb_load_balance_curr); | |
891 | } | |
892 | ||
a4ac01c3 | 893 | #ifdef CONFIG_FAIR_GROUP_SCHED |
bf0f6f24 IM |
894 | static int cfs_rq_best_prio(struct cfs_rq *cfs_rq) |
895 | { | |
896 | struct sched_entity *curr; | |
897 | struct task_struct *p; | |
898 | ||
899 | if (!cfs_rq->nr_running) | |
900 | return MAX_PRIO; | |
901 | ||
9b5b7751 SV |
902 | curr = cfs_rq->curr; |
903 | if (!curr) | |
904 | curr = __pick_next_entity(cfs_rq); | |
905 | ||
bf0f6f24 IM |
906 | p = task_of(curr); |
907 | ||
908 | return p->prio; | |
909 | } | |
a4ac01c3 | 910 | #endif |
bf0f6f24 | 911 | |
43010659 | 912 | static unsigned long |
bf0f6f24 | 913 | load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest, |
a4ac01c3 PW |
914 | unsigned long max_nr_move, unsigned long max_load_move, |
915 | struct sched_domain *sd, enum cpu_idle_type idle, | |
916 | int *all_pinned, int *this_best_prio) | |
bf0f6f24 IM |
917 | { |
918 | struct cfs_rq *busy_cfs_rq; | |
919 | unsigned long load_moved, total_nr_moved = 0, nr_moved; | |
920 | long rem_load_move = max_load_move; | |
921 | struct rq_iterator cfs_rq_iterator; | |
922 | ||
923 | cfs_rq_iterator.start = load_balance_start_fair; | |
924 | cfs_rq_iterator.next = load_balance_next_fair; | |
925 | ||
926 | for_each_leaf_cfs_rq(busiest, busy_cfs_rq) { | |
a4ac01c3 | 927 | #ifdef CONFIG_FAIR_GROUP_SCHED |
bf0f6f24 | 928 | struct cfs_rq *this_cfs_rq; |
e56f31aa | 929 | long imbalance; |
bf0f6f24 | 930 | unsigned long maxload; |
bf0f6f24 IM |
931 | |
932 | this_cfs_rq = cpu_cfs_rq(busy_cfs_rq, this_cpu); | |
933 | ||
e56f31aa | 934 | imbalance = busy_cfs_rq->load.weight - this_cfs_rq->load.weight; |
bf0f6f24 IM |
935 | /* Don't pull if this_cfs_rq has more load than busy_cfs_rq */ |
936 | if (imbalance <= 0) | |
937 | continue; | |
938 | ||
939 | /* Don't pull more than imbalance/2 */ | |
940 | imbalance /= 2; | |
941 | maxload = min(rem_load_move, imbalance); | |
942 | ||
a4ac01c3 PW |
943 | *this_best_prio = cfs_rq_best_prio(this_cfs_rq); |
944 | #else | |
e56f31aa | 945 | # define maxload rem_load_move |
a4ac01c3 | 946 | #endif |
bf0f6f24 IM |
947 | /* pass busy_cfs_rq argument into |
948 | * load_balance_[start|next]_fair iterators | |
949 | */ | |
950 | cfs_rq_iterator.arg = busy_cfs_rq; | |
951 | nr_moved = balance_tasks(this_rq, this_cpu, busiest, | |
952 | max_nr_move, maxload, sd, idle, all_pinned, | |
a4ac01c3 | 953 | &load_moved, this_best_prio, &cfs_rq_iterator); |
bf0f6f24 IM |
954 | |
955 | total_nr_moved += nr_moved; | |
956 | max_nr_move -= nr_moved; | |
957 | rem_load_move -= load_moved; | |
958 | ||
959 | if (max_nr_move <= 0 || rem_load_move <= 0) | |
960 | break; | |
961 | } | |
962 | ||
43010659 | 963 | return max_load_move - rem_load_move; |
bf0f6f24 IM |
964 | } |
965 | ||
966 | /* | |
967 | * scheduler tick hitting a task of our scheduling class: | |
968 | */ | |
969 | static void task_tick_fair(struct rq *rq, struct task_struct *curr) | |
970 | { | |
971 | struct cfs_rq *cfs_rq; | |
972 | struct sched_entity *se = &curr->se; | |
973 | ||
974 | for_each_sched_entity(se) { | |
975 | cfs_rq = cfs_rq_of(se); | |
976 | entity_tick(cfs_rq, se); | |
977 | } | |
978 | } | |
979 | ||
4d78e7b6 PZ |
980 | #define swap(a,b) do { typeof(a) tmp = (a); (a) = (b); (b) = tmp; } while (0) |
981 | ||
bf0f6f24 IM |
982 | /* |
983 | * Share the fairness runtime between parent and child, thus the | |
984 | * total amount of pressure for CPU stays equal - new tasks | |
985 | * get a chance to run but frequent forkers are not allowed to | |
986 | * monopolize the CPU. Note: the parent runqueue is locked, | |
987 | * the child is not running yet. | |
988 | */ | |
ee0827d8 | 989 | static void task_new_fair(struct rq *rq, struct task_struct *p) |
bf0f6f24 IM |
990 | { |
991 | struct cfs_rq *cfs_rq = task_cfs_rq(p); | |
429d43bc | 992 | struct sched_entity *se = &p->se, *curr = cfs_rq->curr; |
bf0f6f24 IM |
993 | |
994 | sched_info_queued(p); | |
995 | ||
7109c442 | 996 | update_curr(cfs_rq); |
aeb73b04 | 997 | place_entity(cfs_rq, se, 1); |
4d78e7b6 | 998 | |
4d78e7b6 PZ |
999 | if (sysctl_sched_child_runs_first && |
1000 | curr->vruntime < se->vruntime) { | |
87fefa38 | 1001 | /* |
edcb60a3 IM |
1002 | * Upon rescheduling, sched_class::put_prev_task() will place |
1003 | * 'current' within the tree based on its new key value. | |
1004 | */ | |
4d78e7b6 | 1005 | swap(curr->vruntime, se->vruntime); |
4d78e7b6 | 1006 | } |
bf0f6f24 | 1007 | |
e9acbff6 | 1008 | update_stats_enqueue(cfs_rq, se); |
ddc97297 PZ |
1009 | check_spread(cfs_rq, se); |
1010 | check_spread(cfs_rq, curr); | |
bf0f6f24 | 1011 | __enqueue_entity(cfs_rq, se); |
30cfdcfc | 1012 | account_entity_enqueue(cfs_rq, se); |
bb61c210 | 1013 | resched_task(rq->curr); |
bf0f6f24 IM |
1014 | } |
1015 | ||
83b699ed SV |
1016 | /* Account for a task changing its policy or group. |
1017 | * | |
1018 | * This routine is mostly called to set cfs_rq->curr field when a task | |
1019 | * migrates between groups/classes. | |
1020 | */ | |
1021 | static void set_curr_task_fair(struct rq *rq) | |
1022 | { | |
1023 | struct sched_entity *se = &rq->curr->se; | |
1024 | ||
1025 | for_each_sched_entity(se) | |
1026 | set_next_entity(cfs_rq_of(se), se); | |
1027 | } | |
1028 | ||
bf0f6f24 IM |
1029 | /* |
1030 | * All the scheduling class methods: | |
1031 | */ | |
5522d5d5 IM |
1032 | static const struct sched_class fair_sched_class = { |
1033 | .next = &idle_sched_class, | |
bf0f6f24 IM |
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 |