1
2
3
4
5#include "sched.h"
6
7#ifdef CONFIG_IRQ_TIME_ACCOUNTING
8
9
10
11
12
13
14
15
16
17
18
19
20DEFINE_PER_CPU(struct irqtime, cpu_irqtime);
21
22static int sched_clock_irqtime;
23
24void enable_sched_clock_irqtime(void)
25{
26 sched_clock_irqtime = 1;
27}
28
29void disable_sched_clock_irqtime(void)
30{
31 sched_clock_irqtime = 0;
32}
33
34static void irqtime_account_delta(struct irqtime *irqtime, u64 delta,
35 enum cpu_usage_stat idx)
36{
37 u64 *cpustat = kcpustat_this_cpu->cpustat;
38
39 u64_stats_update_begin(&irqtime->sync);
40 cpustat[idx] += delta;
41 irqtime->total += delta;
42 irqtime->tick_delta += delta;
43 u64_stats_update_end(&irqtime->sync);
44}
45
46
47
48
49
50void irqtime_account_irq(struct task_struct *curr)
51{
52 struct irqtime *irqtime = this_cpu_ptr(&cpu_irqtime);
53 s64 delta;
54 int cpu;
55
56 if (!sched_clock_irqtime)
57 return;
58
59 cpu = smp_processor_id();
60 delta = sched_clock_cpu(cpu) - irqtime->irq_start_time;
61 irqtime->irq_start_time += delta;
62
63
64
65
66
67
68
69 if (hardirq_count())
70 irqtime_account_delta(irqtime, delta, CPUTIME_IRQ);
71 else if (in_serving_softirq() && curr != this_cpu_ksoftirqd())
72 irqtime_account_delta(irqtime, delta, CPUTIME_SOFTIRQ);
73}
74EXPORT_SYMBOL_GPL(irqtime_account_irq);
75
76static u64 irqtime_tick_accounted(u64 maxtime)
77{
78 struct irqtime *irqtime = this_cpu_ptr(&cpu_irqtime);
79 u64 delta;
80
81 delta = min(irqtime->tick_delta, maxtime);
82 irqtime->tick_delta -= delta;
83
84 return delta;
85}
86
87#else
88
89#define sched_clock_irqtime (0)
90
91static u64 irqtime_tick_accounted(u64 dummy)
92{
93 return 0;
94}
95
96#endif
97
98static inline void task_group_account_field(struct task_struct *p, int index,
99 u64 tmp)
100{
101
102
103
104
105
106
107 __this_cpu_add(kernel_cpustat.cpustat[index], tmp);
108
109 cgroup_account_cputime_field(p, index, tmp);
110}
111
112
113
114
115
116
117void account_user_time(struct task_struct *p, u64 cputime)
118{
119 int index;
120
121
122 p->utime += cputime;
123 account_group_user_time(p, cputime);
124
125 index = (task_nice(p) > 0) ? CPUTIME_NICE : CPUTIME_USER;
126
127
128 task_group_account_field(p, index, cputime);
129
130
131 acct_account_cputime(p);
132}
133
134
135
136
137
138
139void account_guest_time(struct task_struct *p, u64 cputime)
140{
141 u64 *cpustat = kcpustat_this_cpu->cpustat;
142
143
144 p->utime += cputime;
145 account_group_user_time(p, cputime);
146 p->gtime += cputime;
147
148
149 if (task_nice(p) > 0) {
150 cpustat[CPUTIME_NICE] += cputime;
151 cpustat[CPUTIME_GUEST_NICE] += cputime;
152 } else {
153 cpustat[CPUTIME_USER] += cputime;
154 cpustat[CPUTIME_GUEST] += cputime;
155 }
156}
157
158
159
160
161
162
163
164void account_system_index_time(struct task_struct *p,
165 u64 cputime, enum cpu_usage_stat index)
166{
167
168 p->stime += cputime;
169 account_group_system_time(p, cputime);
170
171
172 task_group_account_field(p, index, cputime);
173
174
175 acct_account_cputime(p);
176}
177
178
179
180
181
182
183
184void account_system_time(struct task_struct *p, int hardirq_offset, u64 cputime)
185{
186 int index;
187
188 if ((p->flags & PF_VCPU) && (irq_count() - hardirq_offset == 0)) {
189 account_guest_time(p, cputime);
190 return;
191 }
192
193 if (hardirq_count() - hardirq_offset)
194 index = CPUTIME_IRQ;
195 else if (in_serving_softirq())
196 index = CPUTIME_SOFTIRQ;
197 else
198 index = CPUTIME_SYSTEM;
199
200 account_system_index_time(p, cputime, index);
201}
202
203
204
205
206
207void account_steal_time(u64 cputime)
208{
209 u64 *cpustat = kcpustat_this_cpu->cpustat;
210
211 cpustat[CPUTIME_STEAL] += cputime;
212}
213
214
215
216
217
218void account_idle_time(u64 cputime)
219{
220 u64 *cpustat = kcpustat_this_cpu->cpustat;
221 struct rq *rq = this_rq();
222
223 if (atomic_read(&rq->nr_iowait) > 0)
224 cpustat[CPUTIME_IOWAIT] += cputime;
225 else
226 cpustat[CPUTIME_IDLE] += cputime;
227}
228
229
230
231
232
233
234static __always_inline u64 steal_account_process_time(u64 maxtime)
235{
236#ifdef CONFIG_PARAVIRT
237 if (static_key_false(¶virt_steal_enabled)) {
238 u64 steal;
239
240 steal = paravirt_steal_clock(smp_processor_id());
241 steal -= this_rq()->prev_steal_time;
242 steal = min(steal, maxtime);
243 account_steal_time(steal);
244 this_rq()->prev_steal_time += steal;
245
246 return steal;
247 }
248#endif
249 return 0;
250}
251
252
253
254
255static inline u64 account_other_time(u64 max)
256{
257 u64 accounted;
258
259 lockdep_assert_irqs_disabled();
260
261 accounted = steal_account_process_time(max);
262
263 if (accounted < max)
264 accounted += irqtime_tick_accounted(max - accounted);
265
266 return accounted;
267}
268
269#ifdef CONFIG_64BIT
270static inline u64 read_sum_exec_runtime(struct task_struct *t)
271{
272 return t->se.sum_exec_runtime;
273}
274#else
275static u64 read_sum_exec_runtime(struct task_struct *t)
276{
277 u64 ns;
278 struct rq_flags rf;
279 struct rq *rq;
280
281 rq = task_rq_lock(t, &rf);
282 ns = t->se.sum_exec_runtime;
283 task_rq_unlock(rq, t, &rf);
284
285 return ns;
286}
287#endif
288
289
290
291
292
293void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
294{
295 struct signal_struct *sig = tsk->signal;
296 u64 utime, stime;
297 struct task_struct *t;
298 unsigned int seq, nextseq;
299 unsigned long flags;
300
301
302
303
304
305
306
307
308
309 if (same_thread_group(current, tsk))
310 (void) task_sched_runtime(current);
311
312 rcu_read_lock();
313
314 nextseq = 0;
315 do {
316 seq = nextseq;
317 flags = read_seqbegin_or_lock_irqsave(&sig->stats_lock, &seq);
318 times->utime = sig->utime;
319 times->stime = sig->stime;
320 times->sum_exec_runtime = sig->sum_sched_runtime;
321
322 for_each_thread(tsk, t) {
323 task_cputime(t, &utime, &stime);
324 times->utime += utime;
325 times->stime += stime;
326 times->sum_exec_runtime += read_sum_exec_runtime(t);
327 }
328
329 nextseq = 1;
330 } while (need_seqretry(&sig->stats_lock, seq));
331 done_seqretry_irqrestore(&sig->stats_lock, seq, flags);
332 rcu_read_unlock();
333}
334
335#ifdef CONFIG_IRQ_TIME_ACCOUNTING
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
358 struct rq *rq, int ticks)
359{
360 u64 other, cputime = TICK_NSEC * ticks;
361
362
363
364
365
366
367
368
369 other = account_other_time(ULONG_MAX);
370 if (other >= cputime)
371 return;
372
373 cputime -= other;
374
375 if (this_cpu_ksoftirqd() == p) {
376
377
378
379
380
381 account_system_index_time(p, cputime, CPUTIME_SOFTIRQ);
382 } else if (user_tick) {
383 account_user_time(p, cputime);
384 } else if (p == rq->idle) {
385 account_idle_time(cputime);
386 } else if (p->flags & PF_VCPU) {
387 account_guest_time(p, cputime);
388 } else {
389 account_system_index_time(p, cputime, CPUTIME_SYSTEM);
390 }
391}
392
393static void irqtime_account_idle_ticks(int ticks)
394{
395 struct rq *rq = this_rq();
396
397 irqtime_account_process_tick(current, 0, rq, ticks);
398}
399#else
400static inline void irqtime_account_idle_ticks(int ticks) { }
401static inline void irqtime_account_process_tick(struct task_struct *p, int user_tick,
402 struct rq *rq, int nr_ticks) { }
403#endif
404
405
406
407
408#ifdef CONFIG_VIRT_CPU_ACCOUNTING
409# ifndef __ARCH_HAS_VTIME_TASK_SWITCH
410void vtime_common_task_switch(struct task_struct *prev)
411{
412 if (is_idle_task(prev))
413 vtime_account_idle(prev);
414 else
415 vtime_account_system(prev);
416
417 vtime_flush(prev);
418 arch_vtime_task_switch(prev);
419}
420# endif
421#endif
422
423
424#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
425
426
427
428
429
430
431
432
433#ifndef __ARCH_HAS_VTIME_ACCOUNT
434void vtime_account_irq_enter(struct task_struct *tsk)
435{
436 if (!in_interrupt() && is_idle_task(tsk))
437 vtime_account_idle(tsk);
438 else
439 vtime_account_system(tsk);
440}
441EXPORT_SYMBOL_GPL(vtime_account_irq_enter);
442#endif
443
444void cputime_adjust(struct task_cputime *curr, struct prev_cputime *prev,
445 u64 *ut, u64 *st)
446{
447 *ut = curr->utime;
448 *st = curr->stime;
449}
450
451void task_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st)
452{
453 *ut = p->utime;
454 *st = p->stime;
455}
456EXPORT_SYMBOL_GPL(task_cputime_adjusted);
457
458void thread_group_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st)
459{
460 struct task_cputime cputime;
461
462 thread_group_cputime(p, &cputime);
463
464 *ut = cputime.utime;
465 *st = cputime.stime;
466}
467
468#else
469
470
471
472
473
474
475void account_process_tick(struct task_struct *p, int user_tick)
476{
477 u64 cputime, steal;
478 struct rq *rq = this_rq();
479
480 if (vtime_accounting_cpu_enabled())
481 return;
482
483 if (sched_clock_irqtime) {
484 irqtime_account_process_tick(p, user_tick, rq, 1);
485 return;
486 }
487
488 cputime = TICK_NSEC;
489 steal = steal_account_process_time(ULONG_MAX);
490
491 if (steal >= cputime)
492 return;
493
494 cputime -= steal;
495
496 if (user_tick)
497 account_user_time(p, cputime);
498 else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
499 account_system_time(p, HARDIRQ_OFFSET, cputime);
500 else
501 account_idle_time(cputime);
502}
503
504
505
506
507
508void account_idle_ticks(unsigned long ticks)
509{
510 u64 cputime, steal;
511
512 if (sched_clock_irqtime) {
513 irqtime_account_idle_ticks(ticks);
514 return;
515 }
516
517 cputime = ticks * TICK_NSEC;
518 steal = steal_account_process_time(ULONG_MAX);
519
520 if (steal >= cputime)
521 return;
522
523 cputime -= steal;
524 account_idle_time(cputime);
525}
526
527
528
529
530
531static u64 scale_stime(u64 stime, u64 rtime, u64 total)
532{
533 u64 scaled;
534
535 for (;;) {
536
537 if (stime > rtime)
538 swap(rtime, stime);
539
540
541 if (total >> 32)
542 goto drop_precision;
543
544
545 if (!(rtime >> 32))
546 break;
547
548
549 if (stime >> 31)
550 goto drop_precision;
551
552
553 stime <<= 1;
554 rtime >>= 1;
555 continue;
556
557drop_precision:
558
559 rtime >>= 1;
560 total >>= 1;
561 }
562
563
564
565
566
567 scaled = div_u64((u64) (u32) stime * (u64) (u32) rtime, (u32)total);
568 return scaled;
569}
570
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579
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582
583
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589
590
591void cputime_adjust(struct task_cputime *curr, struct prev_cputime *prev,
592 u64 *ut, u64 *st)
593{
594 u64 rtime, stime, utime;
595 unsigned long flags;
596
597
598 raw_spin_lock_irqsave(&prev->lock, flags);
599 rtime = curr->sum_exec_runtime;
600
601
602
603
604
605
606
607
608
609 if (prev->stime + prev->utime >= rtime)
610 goto out;
611
612 stime = curr->stime;
613 utime = curr->utime;
614
615
616
617
618
619
620 if (stime == 0) {
621 utime = rtime;
622 goto update;
623 }
624
625 if (utime == 0) {
626 stime = rtime;
627 goto update;
628 }
629
630 stime = scale_stime(stime, rtime, stime + utime);
631
632update:
633
634
635
636
637
638
639
640
641
642 if (stime < prev->stime)
643 stime = prev->stime;
644 utime = rtime - stime;
645
646
647
648
649
650 if (utime < prev->utime) {
651 utime = prev->utime;
652 stime = rtime - utime;
653 }
654
655 prev->stime = stime;
656 prev->utime = utime;
657out:
658 *ut = prev->utime;
659 *st = prev->stime;
660 raw_spin_unlock_irqrestore(&prev->lock, flags);
661}
662
663void task_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st)
664{
665 struct task_cputime cputime = {
666 .sum_exec_runtime = p->se.sum_exec_runtime,
667 };
668
669 task_cputime(p, &cputime.utime, &cputime.stime);
670 cputime_adjust(&cputime, &p->prev_cputime, ut, st);
671}
672EXPORT_SYMBOL_GPL(task_cputime_adjusted);
673
674void thread_group_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st)
675{
676 struct task_cputime cputime;
677
678 thread_group_cputime(p, &cputime);
679 cputime_adjust(&cputime, &p->signal->prev_cputime, ut, st);
680}
681#endif
682
683#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
684static u64 vtime_delta(struct vtime *vtime)
685{
686 unsigned long long clock;
687
688 clock = sched_clock();
689 if (clock < vtime->starttime)
690 return 0;
691
692 return clock - vtime->starttime;
693}
694
695static u64 get_vtime_delta(struct vtime *vtime)
696{
697 u64 delta = vtime_delta(vtime);
698 u64 other;
699
700
701
702
703
704
705
706
707 other = account_other_time(delta);
708 WARN_ON_ONCE(vtime->state == VTIME_INACTIVE);
709 vtime->starttime += delta;
710
711 return delta - other;
712}
713
714static void __vtime_account_system(struct task_struct *tsk,
715 struct vtime *vtime)
716{
717 vtime->stime += get_vtime_delta(vtime);
718 if (vtime->stime >= TICK_NSEC) {
719 account_system_time(tsk, irq_count(), vtime->stime);
720 vtime->stime = 0;
721 }
722}
723
724static void vtime_account_guest(struct task_struct *tsk,
725 struct vtime *vtime)
726{
727 vtime->gtime += get_vtime_delta(vtime);
728 if (vtime->gtime >= TICK_NSEC) {
729 account_guest_time(tsk, vtime->gtime);
730 vtime->gtime = 0;
731 }
732}
733
734void vtime_account_system(struct task_struct *tsk)
735{
736 struct vtime *vtime = &tsk->vtime;
737
738 if (!vtime_delta(vtime))
739 return;
740
741 write_seqcount_begin(&vtime->seqcount);
742
743 if (current->flags & PF_VCPU)
744 vtime_account_guest(tsk, vtime);
745 else
746 __vtime_account_system(tsk, vtime);
747 write_seqcount_end(&vtime->seqcount);
748}
749
750void vtime_user_enter(struct task_struct *tsk)
751{
752 struct vtime *vtime = &tsk->vtime;
753
754 write_seqcount_begin(&vtime->seqcount);
755 __vtime_account_system(tsk, vtime);
756 vtime->state = VTIME_USER;
757 write_seqcount_end(&vtime->seqcount);
758}
759
760void vtime_user_exit(struct task_struct *tsk)
761{
762 struct vtime *vtime = &tsk->vtime;
763
764 write_seqcount_begin(&vtime->seqcount);
765 vtime->utime += get_vtime_delta(vtime);
766 if (vtime->utime >= TICK_NSEC) {
767 account_user_time(tsk, vtime->utime);
768 vtime->utime = 0;
769 }
770 vtime->state = VTIME_SYS;
771 write_seqcount_end(&vtime->seqcount);
772}
773
774void vtime_guest_enter(struct task_struct *tsk)
775{
776 struct vtime *vtime = &tsk->vtime;
777
778
779
780
781
782
783
784 write_seqcount_begin(&vtime->seqcount);
785 __vtime_account_system(tsk, vtime);
786 current->flags |= PF_VCPU;
787 write_seqcount_end(&vtime->seqcount);
788}
789EXPORT_SYMBOL_GPL(vtime_guest_enter);
790
791void vtime_guest_exit(struct task_struct *tsk)
792{
793 struct vtime *vtime = &tsk->vtime;
794
795 write_seqcount_begin(&vtime->seqcount);
796 vtime_account_guest(tsk, vtime);
797 current->flags &= ~PF_VCPU;
798 write_seqcount_end(&vtime->seqcount);
799}
800EXPORT_SYMBOL_GPL(vtime_guest_exit);
801
802void vtime_account_idle(struct task_struct *tsk)
803{
804 account_idle_time(get_vtime_delta(&tsk->vtime));
805}
806
807void arch_vtime_task_switch(struct task_struct *prev)
808{
809 struct vtime *vtime = &prev->vtime;
810
811 write_seqcount_begin(&vtime->seqcount);
812 vtime->state = VTIME_INACTIVE;
813 write_seqcount_end(&vtime->seqcount);
814
815 vtime = ¤t->vtime;
816
817 write_seqcount_begin(&vtime->seqcount);
818 vtime->state = VTIME_SYS;
819 vtime->starttime = sched_clock();
820 write_seqcount_end(&vtime->seqcount);
821}
822
823void vtime_init_idle(struct task_struct *t, int cpu)
824{
825 struct vtime *vtime = &t->vtime;
826 unsigned long flags;
827
828 local_irq_save(flags);
829 write_seqcount_begin(&vtime->seqcount);
830 vtime->state = VTIME_SYS;
831 vtime->starttime = sched_clock();
832 write_seqcount_end(&vtime->seqcount);
833 local_irq_restore(flags);
834}
835
836u64 task_gtime(struct task_struct *t)
837{
838 struct vtime *vtime = &t->vtime;
839 unsigned int seq;
840 u64 gtime;
841
842 if (!vtime_accounting_enabled())
843 return t->gtime;
844
845 do {
846 seq = read_seqcount_begin(&vtime->seqcount);
847
848 gtime = t->gtime;
849 if (vtime->state == VTIME_SYS && t->flags & PF_VCPU)
850 gtime += vtime->gtime + vtime_delta(vtime);
851
852 } while (read_seqcount_retry(&vtime->seqcount, seq));
853
854 return gtime;
855}
856
857
858
859
860
861
862void task_cputime(struct task_struct *t, u64 *utime, u64 *stime)
863{
864 struct vtime *vtime = &t->vtime;
865 unsigned int seq;
866 u64 delta;
867
868 if (!vtime_accounting_enabled()) {
869 *utime = t->utime;
870 *stime = t->stime;
871 return;
872 }
873
874 do {
875 seq = read_seqcount_begin(&vtime->seqcount);
876
877 *utime = t->utime;
878 *stime = t->stime;
879
880
881 if (vtime->state == VTIME_INACTIVE || is_idle_task(t))
882 continue;
883
884 delta = vtime_delta(vtime);
885
886
887
888
889
890 if (vtime->state == VTIME_USER || t->flags & PF_VCPU)
891 *utime += vtime->utime + delta;
892 else if (vtime->state == VTIME_SYS)
893 *stime += vtime->stime + delta;
894 } while (read_seqcount_retry(&vtime->seqcount, seq));
895}
896#endif
897