1 #include <linux/export.h>
2 #include <linux/sched.h>
3 #include <linux/tsacct_kern.h>
4 #include <linux/kernel_stat.h>
5 #include <linux/static_key.h>
6 #include <linux/context_tracking.h>
9 #include <asm/paravirt.h>
13 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
16 * There are no locks covering percpu hardirq/softirq time.
17 * They are only modified in vtime_account, on corresponding CPU
18 * with interrupts disabled. So, writes are safe.
19 * They are read and saved off onto struct rq in update_rq_clock().
20 * This may result in other CPU reading this CPU's irq time and can
21 * race with irq/vtime_account on this CPU. We would either get old
22 * or new value with a side effect of accounting a slice of irq time to wrong
23 * task when irq is in progress while we read rq->clock. That is a worthy
24 * compromise in place of having locks on each irq in account_system_time.
26 DEFINE_PER_CPU(u64, cpu_hardirq_time);
27 DEFINE_PER_CPU(u64, cpu_softirq_time);
29 static DEFINE_PER_CPU(u64, irq_start_time);
30 static int sched_clock_irqtime;
32 void enable_sched_clock_irqtime(void)
34 sched_clock_irqtime = 1;
37 void disable_sched_clock_irqtime(void)
39 sched_clock_irqtime = 0;
43 DEFINE_PER_CPU(seqcount_t, irq_time_seq);
44 #endif /* CONFIG_64BIT */
47 * Called before incrementing preempt_count on {soft,}irq_enter
48 * and before decrementing preempt_count on {soft,}irq_exit.
50 void irqtime_account_irq(struct task_struct *curr)
55 if (!sched_clock_irqtime)
58 cpu = smp_processor_id();
59 delta = sched_clock_cpu(cpu) - __this_cpu_read(irq_start_time);
60 __this_cpu_add(irq_start_time, delta);
62 irq_time_write_begin();
64 * We do not account for softirq time from ksoftirqd here.
65 * We want to continue accounting softirq time to ksoftirqd thread
66 * in that case, so as not to confuse scheduler with a special task
67 * that do not consume any time, but still wants to run.
70 __this_cpu_add(cpu_hardirq_time, delta);
71 else if (in_serving_softirq() && curr != this_cpu_ksoftirqd())
72 __this_cpu_add(cpu_softirq_time, delta);
76 EXPORT_SYMBOL_GPL(irqtime_account_irq);
78 static cputime_t irqtime_account_hi_update(cputime_t maxtime)
80 u64 *cpustat = kcpustat_this_cpu->cpustat;
82 cputime_t irq_cputime;
84 local_irq_save(flags);
85 irq_cputime = nsecs_to_cputime64(this_cpu_read(cpu_hardirq_time)) -
87 irq_cputime = min(irq_cputime, maxtime);
88 cpustat[CPUTIME_IRQ] += irq_cputime;
89 local_irq_restore(flags);
93 static cputime_t irqtime_account_si_update(cputime_t maxtime)
95 u64 *cpustat = kcpustat_this_cpu->cpustat;
97 cputime_t softirq_cputime;
99 local_irq_save(flags);
100 softirq_cputime = nsecs_to_cputime64(this_cpu_read(cpu_softirq_time)) -
101 cpustat[CPUTIME_SOFTIRQ];
102 softirq_cputime = min(softirq_cputime, maxtime);
103 cpustat[CPUTIME_SOFTIRQ] += softirq_cputime;
104 local_irq_restore(flags);
105 return softirq_cputime;
108 #else /* CONFIG_IRQ_TIME_ACCOUNTING */
110 #define sched_clock_irqtime (0)
112 static cputime_t irqtime_account_hi_update(cputime_t dummy)
117 static cputime_t irqtime_account_si_update(cputime_t dummy)
122 #endif /* !CONFIG_IRQ_TIME_ACCOUNTING */
124 static inline void task_group_account_field(struct task_struct *p, int index,
128 * Since all updates are sure to touch the root cgroup, we
129 * get ourselves ahead and touch it first. If the root cgroup
130 * is the only cgroup, then nothing else should be necessary.
133 __this_cpu_add(kernel_cpustat.cpustat[index], tmp);
135 cpuacct_account_field(p, index, tmp);
139 * Account user cpu time to a process.
140 * @p: the process that the cpu time gets accounted to
141 * @cputime: the cpu time spent in user space since the last update
142 * @cputime_scaled: cputime scaled by cpu frequency
144 void account_user_time(struct task_struct *p, cputime_t cputime,
145 cputime_t cputime_scaled)
149 /* Add user time to process. */
151 p->utimescaled += cputime_scaled;
152 account_group_user_time(p, cputime);
154 index = (task_nice(p) > 0) ? CPUTIME_NICE : CPUTIME_USER;
156 /* Add user time to cpustat. */
157 task_group_account_field(p, index, (__force u64) cputime);
159 /* Account for user time used */
160 acct_account_cputime(p);
164 * Account guest cpu time to a process.
165 * @p: the process that the cpu time gets accounted to
166 * @cputime: the cpu time spent in virtual machine since the last update
167 * @cputime_scaled: cputime scaled by cpu frequency
169 static void account_guest_time(struct task_struct *p, cputime_t cputime,
170 cputime_t cputime_scaled)
172 u64 *cpustat = kcpustat_this_cpu->cpustat;
174 /* Add guest time to process. */
176 p->utimescaled += cputime_scaled;
177 account_group_user_time(p, cputime);
180 /* Add guest time to cpustat. */
181 if (task_nice(p) > 0) {
182 cpustat[CPUTIME_NICE] += (__force u64) cputime;
183 cpustat[CPUTIME_GUEST_NICE] += (__force u64) cputime;
185 cpustat[CPUTIME_USER] += (__force u64) cputime;
186 cpustat[CPUTIME_GUEST] += (__force u64) cputime;
191 * Account system cpu time to a process and desired cpustat field
192 * @p: the process that the cpu time gets accounted to
193 * @cputime: the cpu time spent in kernel space since the last update
194 * @cputime_scaled: cputime scaled by cpu frequency
195 * @target_cputime64: pointer to cpustat field that has to be updated
198 void __account_system_time(struct task_struct *p, cputime_t cputime,
199 cputime_t cputime_scaled, int index)
201 /* Add system time to process. */
203 p->stimescaled += cputime_scaled;
204 account_group_system_time(p, cputime);
206 /* Add system time to cpustat. */
207 task_group_account_field(p, index, (__force u64) cputime);
209 /* Account for system time used */
210 acct_account_cputime(p);
214 * Account system cpu time to a process.
215 * @p: the process that the cpu time gets accounted to
216 * @hardirq_offset: the offset to subtract from hardirq_count()
217 * @cputime: the cpu time spent in kernel space since the last update
218 * @cputime_scaled: cputime scaled by cpu frequency
220 void account_system_time(struct task_struct *p, int hardirq_offset,
221 cputime_t cputime, cputime_t cputime_scaled)
225 if ((p->flags & PF_VCPU) && (irq_count() - hardirq_offset == 0)) {
226 account_guest_time(p, cputime, cputime_scaled);
230 if (hardirq_count() - hardirq_offset)
232 else if (in_serving_softirq())
233 index = CPUTIME_SOFTIRQ;
235 index = CPUTIME_SYSTEM;
237 __account_system_time(p, cputime, cputime_scaled, index);
241 * Account for involuntary wait time.
242 * @cputime: the cpu time spent in involuntary wait
244 void account_steal_time(cputime_t cputime)
246 u64 *cpustat = kcpustat_this_cpu->cpustat;
248 cpustat[CPUTIME_STEAL] += (__force u64) cputime;
252 * Account for idle time.
253 * @cputime: the cpu time spent in idle wait
255 void account_idle_time(cputime_t cputime)
257 u64 *cpustat = kcpustat_this_cpu->cpustat;
258 struct rq *rq = this_rq();
260 if (atomic_read(&rq->nr_iowait) > 0)
261 cpustat[CPUTIME_IOWAIT] += (__force u64) cputime;
263 cpustat[CPUTIME_IDLE] += (__force u64) cputime;
266 static __always_inline cputime_t steal_account_process_time(cputime_t maxtime)
268 #ifdef CONFIG_PARAVIRT
269 if (static_key_false(¶virt_steal_enabled)) {
270 cputime_t steal_cputime;
273 steal = paravirt_steal_clock(smp_processor_id());
274 steal -= this_rq()->prev_steal_time;
276 steal_cputime = min(nsecs_to_cputime(steal), maxtime);
277 account_steal_time(steal_cputime);
278 this_rq()->prev_steal_time += cputime_to_nsecs(steal_cputime);
280 return steal_cputime;
287 * Account how much elapsed time was spent in steal, irq, or softirq time.
289 static inline cputime_t account_other_time(cputime_t max)
293 accounted = steal_account_process_time(max);
296 accounted += irqtime_account_hi_update(max - accounted);
299 accounted += irqtime_account_si_update(max - accounted);
305 * Accumulate raw cputime values of dead tasks (sig->[us]time) and live
306 * tasks (sum on group iteration) belonging to @tsk's group.
308 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
310 struct signal_struct *sig = tsk->signal;
311 cputime_t utime, stime;
312 struct task_struct *t;
313 unsigned int seq, nextseq;
317 /* Attempt a lockless read on the first round. */
321 flags = read_seqbegin_or_lock_irqsave(&sig->stats_lock, &seq);
322 times->utime = sig->utime;
323 times->stime = sig->stime;
324 times->sum_exec_runtime = sig->sum_sched_runtime;
326 for_each_thread(tsk, t) {
327 task_cputime(t, &utime, &stime);
328 times->utime += utime;
329 times->stime += stime;
330 times->sum_exec_runtime += task_sched_runtime(t);
332 /* If lockless access failed, take the lock. */
334 } while (need_seqretry(&sig->stats_lock, seq));
335 done_seqretry_irqrestore(&sig->stats_lock, seq, flags);
339 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
341 * Account a tick to a process and cpustat
342 * @p: the process that the cpu time gets accounted to
343 * @user_tick: is the tick from userspace
344 * @rq: the pointer to rq
346 * Tick demultiplexing follows the order
347 * - pending hardirq update
348 * - pending softirq update
352 * - check for guest_time
353 * - else account as system_time
355 * Check for hardirq is done both for system and user time as there is
356 * no timer going off while we are on hardirq and hence we may never get an
357 * opportunity to update it solely in system time.
358 * p->stime and friends are only updated on system time and not on irq
359 * softirq as those do not count in task exec_runtime any more.
361 static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
362 struct rq *rq, int ticks)
364 u64 cputime = (__force u64) cputime_one_jiffy * ticks;
365 cputime_t scaled, other;
368 * When returning from idle, many ticks can get accounted at
369 * once, including some ticks of steal, irq, and softirq time.
370 * Subtract those ticks from the amount of time accounted to
371 * idle, or potentially user or system time. Due to rounding,
372 * other time can exceed ticks occasionally.
374 other = account_other_time(cputime);
375 if (other >= cputime)
378 scaled = cputime_to_scaled(cputime);
380 if (this_cpu_ksoftirqd() == p) {
382 * ksoftirqd time do not get accounted in cpu_softirq_time.
383 * So, we have to handle it separately here.
384 * Also, p->stime needs to be updated for ksoftirqd.
386 __account_system_time(p, cputime, scaled, CPUTIME_SOFTIRQ);
387 } else if (user_tick) {
388 account_user_time(p, cputime, scaled);
389 } else if (p == rq->idle) {
390 account_idle_time(cputime);
391 } else if (p->flags & PF_VCPU) { /* System time or guest time */
392 account_guest_time(p, cputime, scaled);
394 __account_system_time(p, cputime, scaled, CPUTIME_SYSTEM);
398 static void irqtime_account_idle_ticks(int ticks)
400 struct rq *rq = this_rq();
402 irqtime_account_process_tick(current, 0, rq, ticks);
404 #else /* CONFIG_IRQ_TIME_ACCOUNTING */
405 static inline void irqtime_account_idle_ticks(int ticks) {}
406 static inline void irqtime_account_process_tick(struct task_struct *p, int user_tick,
407 struct rq *rq, int nr_ticks) {}
408 #endif /* CONFIG_IRQ_TIME_ACCOUNTING */
411 * Use precise platform statistics if available:
413 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
415 #ifndef __ARCH_HAS_VTIME_TASK_SWITCH
416 void vtime_common_task_switch(struct task_struct *prev)
418 if (is_idle_task(prev))
419 vtime_account_idle(prev);
421 vtime_account_system(prev);
423 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
424 vtime_account_user(prev);
426 arch_vtime_task_switch(prev);
430 #endif /* CONFIG_VIRT_CPU_ACCOUNTING */
433 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
435 * Archs that account the whole time spent in the idle task
436 * (outside irq) as idle time can rely on this and just implement
437 * vtime_account_system() and vtime_account_idle(). Archs that
438 * have other meaning of the idle time (s390 only includes the
439 * time spent by the CPU when it's in low power mode) must override
442 #ifndef __ARCH_HAS_VTIME_ACCOUNT
443 void vtime_account_irq_enter(struct task_struct *tsk)
445 if (!in_interrupt() && is_idle_task(tsk))
446 vtime_account_idle(tsk);
448 vtime_account_system(tsk);
450 EXPORT_SYMBOL_GPL(vtime_account_irq_enter);
451 #endif /* __ARCH_HAS_VTIME_ACCOUNT */
453 void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
458 EXPORT_SYMBOL_GPL(task_cputime_adjusted);
460 void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
462 struct task_cputime cputime;
464 thread_group_cputime(p, &cputime);
469 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
471 * Account a single tick of cpu time.
472 * @p: the process that the cpu time gets accounted to
473 * @user_tick: indicates if the tick is a user or a system tick
475 void account_process_tick(struct task_struct *p, int user_tick)
477 cputime_t cputime, scaled, steal;
478 struct rq *rq = this_rq();
480 if (vtime_accounting_cpu_enabled())
483 if (sched_clock_irqtime) {
484 irqtime_account_process_tick(p, user_tick, rq, 1);
488 cputime = cputime_one_jiffy;
489 steal = steal_account_process_time(cputime);
491 if (steal >= cputime)
495 scaled = cputime_to_scaled(cputime);
498 account_user_time(p, cputime, scaled);
499 else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
500 account_system_time(p, HARDIRQ_OFFSET, cputime, scaled);
502 account_idle_time(cputime);
506 * Account multiple ticks of idle time.
507 * @ticks: number of stolen ticks
509 void account_idle_ticks(unsigned long ticks)
511 cputime_t cputime, steal;
512 if (sched_clock_irqtime) {
513 irqtime_account_idle_ticks(ticks);
517 cputime = cputime_one_jiffy;
518 steal = steal_account_process_time(cputime);
520 if (steal >= cputime)
524 account_idle_time(cputime);
528 * Perform (stime * rtime) / total, but avoid multiplication overflow by
529 * loosing precision when the numbers are big.
531 static cputime_t scale_stime(u64 stime, u64 rtime, u64 total)
536 /* Make sure "rtime" is the bigger of stime/rtime */
540 /* Make sure 'total' fits in 32 bits */
544 /* Does rtime (and thus stime) fit in 32 bits? */
548 /* Can we just balance rtime/stime rather than dropping bits? */
552 /* We can grow stime and shrink rtime and try to make them both fit */
558 /* We drop from rtime, it has more bits than stime */
564 * Make sure gcc understands that this is a 32x32->64 multiply,
565 * followed by a 64/32->64 divide.
567 scaled = div_u64((u64) (u32) stime * (u64) (u32) rtime, (u32)total);
568 return (__force cputime_t) scaled;
572 * Adjust tick based cputime random precision against scheduler runtime
575 * Tick based cputime accounting depend on random scheduling timeslices of a
576 * task to be interrupted or not by the timer. Depending on these
577 * circumstances, the number of these interrupts may be over or
578 * under-optimistic, matching the real user and system cputime with a variable
581 * Fix this by scaling these tick based values against the total runtime
582 * accounted by the CFS scheduler.
584 * This code provides the following guarantees:
586 * stime + utime == rtime
587 * stime_i+1 >= stime_i, utime_i+1 >= utime_i
589 * Assuming that rtime_i+1 >= rtime_i.
591 static void cputime_adjust(struct task_cputime *curr,
592 struct prev_cputime *prev,
593 cputime_t *ut, cputime_t *st)
595 cputime_t rtime, stime, utime;
598 /* Serialize concurrent callers such that we can honour our guarantees */
599 raw_spin_lock_irqsave(&prev->lock, flags);
600 rtime = nsecs_to_cputime(curr->sum_exec_runtime);
603 * This is possible under two circumstances:
604 * - rtime isn't monotonic after all (a bug);
605 * - we got reordered by the lock.
607 * In both cases this acts as a filter such that the rest of the code
608 * can assume it is monotonic regardless of anything else.
610 if (prev->stime + prev->utime >= rtime)
626 stime = scale_stime((__force u64)stime, (__force u64)rtime,
627 (__force u64)(stime + utime));
630 * Make sure stime doesn't go backwards; this preserves monotonicity
631 * for utime because rtime is monotonic.
633 * utime_i+1 = rtime_i+1 - stime_i
634 * = rtime_i+1 - (rtime_i - utime_i)
635 * = (rtime_i+1 - rtime_i) + utime_i
638 if (stime < prev->stime)
640 utime = rtime - stime;
643 * Make sure utime doesn't go backwards; this still preserves
644 * monotonicity for stime, analogous argument to above.
646 if (utime < prev->utime) {
648 stime = rtime - utime;
657 raw_spin_unlock_irqrestore(&prev->lock, flags);
660 void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
662 struct task_cputime cputime = {
663 .sum_exec_runtime = p->se.sum_exec_runtime,
666 task_cputime(p, &cputime.utime, &cputime.stime);
667 cputime_adjust(&cputime, &p->prev_cputime, ut, st);
669 EXPORT_SYMBOL_GPL(task_cputime_adjusted);
671 void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
673 struct task_cputime cputime;
675 thread_group_cputime(p, &cputime);
676 cputime_adjust(&cputime, &p->signal->prev_cputime, ut, st);
678 #endif /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
680 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
681 static cputime_t vtime_delta(struct task_struct *tsk)
683 unsigned long now = READ_ONCE(jiffies);
685 if (time_before(now, (unsigned long)tsk->vtime_snap))
688 return jiffies_to_cputime(now - tsk->vtime_snap);
691 static cputime_t get_vtime_delta(struct task_struct *tsk)
693 unsigned long now = READ_ONCE(jiffies);
694 cputime_t delta, other;
696 delta = jiffies_to_cputime(now - tsk->vtime_snap);
697 other = account_other_time(delta);
698 WARN_ON_ONCE(tsk->vtime_snap_whence == VTIME_INACTIVE);
699 tsk->vtime_snap = now;
701 return delta - other;
704 static void __vtime_account_system(struct task_struct *tsk)
706 cputime_t delta_cpu = get_vtime_delta(tsk);
708 account_system_time(tsk, irq_count(), delta_cpu, cputime_to_scaled(delta_cpu));
711 void vtime_account_system(struct task_struct *tsk)
713 if (!vtime_delta(tsk))
716 write_seqcount_begin(&tsk->vtime_seqcount);
717 __vtime_account_system(tsk);
718 write_seqcount_end(&tsk->vtime_seqcount);
721 void vtime_account_user(struct task_struct *tsk)
725 write_seqcount_begin(&tsk->vtime_seqcount);
726 tsk->vtime_snap_whence = VTIME_SYS;
727 if (vtime_delta(tsk)) {
728 delta_cpu = get_vtime_delta(tsk);
729 account_user_time(tsk, delta_cpu, cputime_to_scaled(delta_cpu));
731 write_seqcount_end(&tsk->vtime_seqcount);
734 void vtime_user_enter(struct task_struct *tsk)
736 write_seqcount_begin(&tsk->vtime_seqcount);
737 if (vtime_delta(tsk))
738 __vtime_account_system(tsk);
739 tsk->vtime_snap_whence = VTIME_USER;
740 write_seqcount_end(&tsk->vtime_seqcount);
743 void vtime_guest_enter(struct task_struct *tsk)
746 * The flags must be updated under the lock with
747 * the vtime_snap flush and update.
748 * That enforces a right ordering and update sequence
749 * synchronization against the reader (task_gtime())
750 * that can thus safely catch up with a tickless delta.
752 write_seqcount_begin(&tsk->vtime_seqcount);
753 if (vtime_delta(tsk))
754 __vtime_account_system(tsk);
755 current->flags |= PF_VCPU;
756 write_seqcount_end(&tsk->vtime_seqcount);
758 EXPORT_SYMBOL_GPL(vtime_guest_enter);
760 void vtime_guest_exit(struct task_struct *tsk)
762 write_seqcount_begin(&tsk->vtime_seqcount);
763 __vtime_account_system(tsk);
764 current->flags &= ~PF_VCPU;
765 write_seqcount_end(&tsk->vtime_seqcount);
767 EXPORT_SYMBOL_GPL(vtime_guest_exit);
769 void vtime_account_idle(struct task_struct *tsk)
771 cputime_t delta_cpu = get_vtime_delta(tsk);
773 account_idle_time(delta_cpu);
776 void arch_vtime_task_switch(struct task_struct *prev)
778 write_seqcount_begin(&prev->vtime_seqcount);
779 prev->vtime_snap_whence = VTIME_INACTIVE;
780 write_seqcount_end(&prev->vtime_seqcount);
782 write_seqcount_begin(¤t->vtime_seqcount);
783 current->vtime_snap_whence = VTIME_SYS;
784 current->vtime_snap = jiffies;
785 write_seqcount_end(¤t->vtime_seqcount);
788 void vtime_init_idle(struct task_struct *t, int cpu)
792 local_irq_save(flags);
793 write_seqcount_begin(&t->vtime_seqcount);
794 t->vtime_snap_whence = VTIME_SYS;
795 t->vtime_snap = jiffies;
796 write_seqcount_end(&t->vtime_seqcount);
797 local_irq_restore(flags);
800 cputime_t task_gtime(struct task_struct *t)
805 if (!vtime_accounting_enabled())
809 seq = read_seqcount_begin(&t->vtime_seqcount);
812 if (t->vtime_snap_whence == VTIME_SYS && t->flags & PF_VCPU)
813 gtime += vtime_delta(t);
815 } while (read_seqcount_retry(&t->vtime_seqcount, seq));
821 * Fetch cputime raw values from fields of task_struct and
822 * add up the pending nohz execution time since the last
826 fetch_task_cputime(struct task_struct *t,
827 cputime_t *u_dst, cputime_t *s_dst,
828 cputime_t *u_src, cputime_t *s_src,
829 cputime_t *udelta, cputime_t *sdelta)
832 unsigned long long delta;
838 seq = read_seqcount_begin(&t->vtime_seqcount);
845 /* Task is sleeping, nothing to add */
846 if (t->vtime_snap_whence == VTIME_INACTIVE ||
850 delta = vtime_delta(t);
853 * Task runs either in user or kernel space, add pending nohz time to
856 if (t->vtime_snap_whence == VTIME_USER || t->flags & PF_VCPU) {
859 if (t->vtime_snap_whence == VTIME_SYS)
862 } while (read_seqcount_retry(&t->vtime_seqcount, seq));
866 void task_cputime(struct task_struct *t, cputime_t *utime, cputime_t *stime)
868 cputime_t udelta, sdelta;
870 if (!vtime_accounting_enabled()) {
878 fetch_task_cputime(t, utime, stime, &t->utime,
879 &t->stime, &udelta, &sdelta);
886 void task_cputime_scaled(struct task_struct *t,
887 cputime_t *utimescaled, cputime_t *stimescaled)
889 cputime_t udelta, sdelta;
891 if (!vtime_accounting_enabled()) {
893 *utimescaled = t->utimescaled;
895 *stimescaled = t->stimescaled;
899 fetch_task_cputime(t, utimescaled, stimescaled,
900 &t->utimescaled, &t->stimescaled, &udelta, &sdelta);
902 *utimescaled += cputime_to_scaled(udelta);
904 *stimescaled += cputime_to_scaled(sdelta);
906 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */