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>
10 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
13 * There are no locks covering percpu hardirq/softirq time.
14 * They are only modified in vtime_account, on corresponding CPU
15 * with interrupts disabled. So, writes are safe.
16 * They are read and saved off onto struct rq in update_rq_clock().
17 * This may result in other CPU reading this CPU's irq time and can
18 * race with irq/vtime_account on this CPU. We would either get old
19 * or new value with a side effect of accounting a slice of irq time to wrong
20 * task when irq is in progress while we read rq->clock. That is a worthy
21 * compromise in place of having locks on each irq in account_system_time.
23 DEFINE_PER_CPU(u64
, cpu_hardirq_time
);
24 DEFINE_PER_CPU(u64
, cpu_softirq_time
);
26 static DEFINE_PER_CPU(u64
, irq_start_time
);
27 static int sched_clock_irqtime
;
29 void enable_sched_clock_irqtime(void)
31 sched_clock_irqtime
= 1;
34 void disable_sched_clock_irqtime(void)
36 sched_clock_irqtime
= 0;
40 DEFINE_PER_CPU(seqcount_t
, irq_time_seq
);
41 #endif /* CONFIG_64BIT */
44 * Called before incrementing preempt_count on {soft,}irq_enter
45 * and before decrementing preempt_count on {soft,}irq_exit.
47 void irqtime_account_irq(struct task_struct
*curr
)
53 if (!sched_clock_irqtime
)
56 local_irq_save(flags
);
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
);
75 local_irq_restore(flags
);
77 EXPORT_SYMBOL_GPL(irqtime_account_irq
);
79 static int irqtime_account_hi_update(void)
81 u64
*cpustat
= kcpustat_this_cpu
->cpustat
;
86 local_irq_save(flags
);
87 latest_ns
= this_cpu_read(cpu_hardirq_time
);
88 if (nsecs_to_cputime64(latest_ns
) > cpustat
[CPUTIME_IRQ
])
90 local_irq_restore(flags
);
94 static int irqtime_account_si_update(void)
96 u64
*cpustat
= kcpustat_this_cpu
->cpustat
;
101 local_irq_save(flags
);
102 latest_ns
= this_cpu_read(cpu_softirq_time
);
103 if (nsecs_to_cputime64(latest_ns
) > cpustat
[CPUTIME_SOFTIRQ
])
105 local_irq_restore(flags
);
109 #else /* CONFIG_IRQ_TIME_ACCOUNTING */
111 #define sched_clock_irqtime (0)
113 #endif /* !CONFIG_IRQ_TIME_ACCOUNTING */
115 static inline void task_group_account_field(struct task_struct
*p
, int index
,
119 * Since all updates are sure to touch the root cgroup, we
120 * get ourselves ahead and touch it first. If the root cgroup
121 * is the only cgroup, then nothing else should be necessary.
124 __this_cpu_add(kernel_cpustat
.cpustat
[index
], tmp
);
126 cpuacct_account_field(p
, index
, tmp
);
130 * Account user cpu time to a process.
131 * @p: the process that the cpu time gets accounted to
132 * @cputime: the cpu time spent in user space since the last update
133 * @cputime_scaled: cputime scaled by cpu frequency
135 void account_user_time(struct task_struct
*p
, cputime_t cputime
,
136 cputime_t cputime_scaled
)
140 /* Add user time to process. */
142 p
->utimescaled
+= cputime_scaled
;
143 account_group_user_time(p
, cputime
);
145 index
= (TASK_NICE(p
) > 0) ? CPUTIME_NICE
: CPUTIME_USER
;
147 /* Add user time to cpustat. */
148 task_group_account_field(p
, index
, (__force u64
) cputime
);
150 /* Account for user time used */
151 acct_account_cputime(p
);
155 * Account guest cpu time to a process.
156 * @p: the process that the cpu time gets accounted to
157 * @cputime: the cpu time spent in virtual machine since the last update
158 * @cputime_scaled: cputime scaled by cpu frequency
160 static void account_guest_time(struct task_struct
*p
, cputime_t cputime
,
161 cputime_t cputime_scaled
)
163 u64
*cpustat
= kcpustat_this_cpu
->cpustat
;
165 /* Add guest time to process. */
167 p
->utimescaled
+= cputime_scaled
;
168 account_group_user_time(p
, cputime
);
171 /* Add guest time to cpustat. */
172 if (TASK_NICE(p
) > 0) {
173 cpustat
[CPUTIME_NICE
] += (__force u64
) cputime
;
174 cpustat
[CPUTIME_GUEST_NICE
] += (__force u64
) cputime
;
176 cpustat
[CPUTIME_USER
] += (__force u64
) cputime
;
177 cpustat
[CPUTIME_GUEST
] += (__force u64
) cputime
;
182 * Account system cpu time to a process and desired cpustat field
183 * @p: the process that the cpu time gets accounted to
184 * @cputime: the cpu time spent in kernel space since the last update
185 * @cputime_scaled: cputime scaled by cpu frequency
186 * @target_cputime64: pointer to cpustat field that has to be updated
189 void __account_system_time(struct task_struct
*p
, cputime_t cputime
,
190 cputime_t cputime_scaled
, int index
)
192 /* Add system time to process. */
194 p
->stimescaled
+= cputime_scaled
;
195 account_group_system_time(p
, cputime
);
197 /* Add system time to cpustat. */
198 task_group_account_field(p
, index
, (__force u64
) cputime
);
200 /* Account for system time used */
201 acct_account_cputime(p
);
205 * Account system cpu time to a process.
206 * @p: the process that the cpu time gets accounted to
207 * @hardirq_offset: the offset to subtract from hardirq_count()
208 * @cputime: the cpu time spent in kernel space since the last update
209 * @cputime_scaled: cputime scaled by cpu frequency
211 void account_system_time(struct task_struct
*p
, int hardirq_offset
,
212 cputime_t cputime
, cputime_t cputime_scaled
)
216 if ((p
->flags
& PF_VCPU
) && (irq_count() - hardirq_offset
== 0)) {
217 account_guest_time(p
, cputime
, cputime_scaled
);
221 if (hardirq_count() - hardirq_offset
)
223 else if (in_serving_softirq())
224 index
= CPUTIME_SOFTIRQ
;
226 index
= CPUTIME_SYSTEM
;
228 __account_system_time(p
, cputime
, cputime_scaled
, index
);
232 * Account for involuntary wait time.
233 * @cputime: the cpu time spent in involuntary wait
235 void account_steal_time(cputime_t cputime
)
237 u64
*cpustat
= kcpustat_this_cpu
->cpustat
;
239 cpustat
[CPUTIME_STEAL
] += (__force u64
) cputime
;
243 * Account for idle time.
244 * @cputime: the cpu time spent in idle wait
246 void account_idle_time(cputime_t cputime
)
248 u64
*cpustat
= kcpustat_this_cpu
->cpustat
;
249 struct rq
*rq
= this_rq();
251 if (atomic_read(&rq
->nr_iowait
) > 0)
252 cpustat
[CPUTIME_IOWAIT
] += (__force u64
) cputime
;
254 cpustat
[CPUTIME_IDLE
] += (__force u64
) cputime
;
257 static __always_inline
bool steal_account_process_tick(void)
259 #ifdef CONFIG_PARAVIRT
260 if (static_key_false(¶virt_steal_enabled
)) {
263 steal
= paravirt_steal_clock(smp_processor_id());
264 steal
-= this_rq()->prev_steal_time
;
266 st
= steal_ticks(steal
);
267 this_rq()->prev_steal_time
+= st
* TICK_NSEC
;
269 account_steal_time(st
);
277 * Accumulate raw cputime values of dead tasks (sig->[us]time) and live
278 * tasks (sum on group iteration) belonging to @tsk's group.
280 void thread_group_cputime(struct task_struct
*tsk
, struct task_cputime
*times
)
282 struct signal_struct
*sig
= tsk
->signal
;
283 cputime_t utime
, stime
;
284 struct task_struct
*t
;
286 times
->utime
= sig
->utime
;
287 times
->stime
= sig
->stime
;
288 times
->sum_exec_runtime
= sig
->sum_sched_runtime
;
291 /* make sure we can trust tsk->thread_group list */
292 if (!likely(pid_alive(tsk
)))
297 task_cputime(t
, &utime
, &stime
);
298 times
->utime
+= utime
;
299 times
->stime
+= stime
;
300 times
->sum_exec_runtime
+= task_sched_runtime(t
);
301 } while_each_thread(tsk
, t
);
306 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
308 * Account a tick to a process and cpustat
309 * @p: the process that the cpu time gets accounted to
310 * @user_tick: is the tick from userspace
311 * @rq: the pointer to rq
313 * Tick demultiplexing follows the order
314 * - pending hardirq update
315 * - pending softirq update
319 * - check for guest_time
320 * - else account as system_time
322 * Check for hardirq is done both for system and user time as there is
323 * no timer going off while we are on hardirq and hence we may never get an
324 * opportunity to update it solely in system time.
325 * p->stime and friends are only updated on system time and not on irq
326 * softirq as those do not count in task exec_runtime any more.
328 static void irqtime_account_process_tick(struct task_struct
*p
, int user_tick
,
329 struct rq
*rq
, int ticks
)
331 cputime_t scaled
= cputime_to_scaled(cputime_one_jiffy
);
332 u64 cputime
= (__force u64
) cputime_one_jiffy
;
333 u64
*cpustat
= kcpustat_this_cpu
->cpustat
;
335 if (steal_account_process_tick())
341 if (irqtime_account_hi_update()) {
342 cpustat
[CPUTIME_IRQ
] += cputime
;
343 } else if (irqtime_account_si_update()) {
344 cpustat
[CPUTIME_SOFTIRQ
] += cputime
;
345 } else if (this_cpu_ksoftirqd() == p
) {
347 * ksoftirqd time do not get accounted in cpu_softirq_time.
348 * So, we have to handle it separately here.
349 * Also, p->stime needs to be updated for ksoftirqd.
351 __account_system_time(p
, cputime
, scaled
, CPUTIME_SOFTIRQ
);
352 } else if (user_tick
) {
353 account_user_time(p
, cputime
, scaled
);
354 } else if (p
== rq
->idle
) {
355 account_idle_time(cputime
);
356 } else if (p
->flags
& PF_VCPU
) { /* System time or guest time */
357 account_guest_time(p
, cputime
, scaled
);
359 __account_system_time(p
, cputime
, scaled
, CPUTIME_SYSTEM
);
363 static void irqtime_account_idle_ticks(int ticks
)
365 struct rq
*rq
= this_rq();
367 irqtime_account_process_tick(current
, 0, rq
, ticks
);
369 #else /* CONFIG_IRQ_TIME_ACCOUNTING */
370 static inline void irqtime_account_idle_ticks(int ticks
) {}
371 static inline void irqtime_account_process_tick(struct task_struct
*p
, int user_tick
,
372 struct rq
*rq
, int nr_ticks
) {}
373 #endif /* CONFIG_IRQ_TIME_ACCOUNTING */
376 * Use precise platform statistics if available:
378 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
380 #ifndef __ARCH_HAS_VTIME_TASK_SWITCH
381 void vtime_common_task_switch(struct task_struct
*prev
)
383 if (is_idle_task(prev
))
384 vtime_account_idle(prev
);
386 vtime_account_system(prev
);
388 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
389 vtime_account_user(prev
);
391 arch_vtime_task_switch(prev
);
396 * Archs that account the whole time spent in the idle task
397 * (outside irq) as idle time can rely on this and just implement
398 * vtime_account_system() and vtime_account_idle(). Archs that
399 * have other meaning of the idle time (s390 only includes the
400 * time spent by the CPU when it's in low power mode) must override
403 #ifndef __ARCH_HAS_VTIME_ACCOUNT
404 void vtime_common_account_irq_enter(struct task_struct
*tsk
)
406 if (!in_interrupt()) {
408 * If we interrupted user, context_tracking_in_user()
409 * is 1 because the context tracking don't hook
410 * on irq entry/exit. This way we know if
411 * we need to flush user time on kernel entry.
413 if (context_tracking_in_user()) {
414 vtime_account_user(tsk
);
418 if (is_idle_task(tsk
)) {
419 vtime_account_idle(tsk
);
423 vtime_account_system(tsk
);
425 EXPORT_SYMBOL_GPL(vtime_common_account_irq_enter
);
426 #endif /* __ARCH_HAS_VTIME_ACCOUNT */
427 #endif /* CONFIG_VIRT_CPU_ACCOUNTING */
430 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
431 void task_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
)
437 void thread_group_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
)
439 struct task_cputime cputime
;
441 thread_group_cputime(p
, &cputime
);
446 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
448 * Account a single tick of cpu time.
449 * @p: the process that the cpu time gets accounted to
450 * @user_tick: indicates if the tick is a user or a system tick
452 void account_process_tick(struct task_struct
*p
, int user_tick
)
454 cputime_t one_jiffy_scaled
= cputime_to_scaled(cputime_one_jiffy
);
455 struct rq
*rq
= this_rq();
457 if (vtime_accounting_enabled())
460 if (sched_clock_irqtime
) {
461 irqtime_account_process_tick(p
, user_tick
, rq
, 1);
465 if (steal_account_process_tick())
469 account_user_time(p
, cputime_one_jiffy
, one_jiffy_scaled
);
470 else if ((p
!= rq
->idle
) || (irq_count() != HARDIRQ_OFFSET
))
471 account_system_time(p
, HARDIRQ_OFFSET
, cputime_one_jiffy
,
474 account_idle_time(cputime_one_jiffy
);
478 * Account multiple ticks of steal time.
479 * @p: the process from which the cpu time has been stolen
480 * @ticks: number of stolen ticks
482 void account_steal_ticks(unsigned long ticks
)
484 account_steal_time(jiffies_to_cputime(ticks
));
488 * Account multiple ticks of idle time.
489 * @ticks: number of stolen ticks
491 void account_idle_ticks(unsigned long ticks
)
494 if (sched_clock_irqtime
) {
495 irqtime_account_idle_ticks(ticks
);
499 account_idle_time(jiffies_to_cputime(ticks
));
503 * Perform (stime * rtime) / total, but avoid multiplication overflow by
504 * loosing precision when the numbers are big.
506 static cputime_t
scale_stime(u64 stime
, u64 rtime
, u64 total
)
511 /* Make sure "rtime" is the bigger of stime/rtime */
515 /* Make sure 'total' fits in 32 bits */
519 /* Does rtime (and thus stime) fit in 32 bits? */
523 /* Can we just balance rtime/stime rather than dropping bits? */
527 /* We can grow stime and shrink rtime and try to make them both fit */
533 /* We drop from rtime, it has more bits than stime */
539 * Make sure gcc understands that this is a 32x32->64 multiply,
540 * followed by a 64/32->64 divide.
542 scaled
= div_u64((u64
) (u32
) stime
* (u64
) (u32
) rtime
, (u32
)total
);
543 return (__force cputime_t
) scaled
;
547 * Adjust tick based cputime random precision against scheduler
548 * runtime accounting.
550 static void cputime_adjust(struct task_cputime
*curr
,
551 struct cputime
*prev
,
552 cputime_t
*ut
, cputime_t
*st
)
554 cputime_t rtime
, stime
, utime
;
557 * Tick based cputime accounting depend on random scheduling
558 * timeslices of a task to be interrupted or not by the timer.
559 * Depending on these circumstances, the number of these interrupts
560 * may be over or under-optimistic, matching the real user and system
561 * cputime with a variable precision.
563 * Fix this by scaling these tick based values against the total
564 * runtime accounted by the CFS scheduler.
566 rtime
= nsecs_to_cputime(curr
->sum_exec_runtime
);
569 * Update userspace visible utime/stime values only if actual execution
570 * time is bigger than already exported. Note that can happen, that we
571 * provided bigger values due to scaling inaccuracy on big numbers.
573 if (prev
->stime
+ prev
->utime
>= rtime
)
581 } else if (stime
== 0) {
584 cputime_t total
= stime
+ utime
;
586 stime
= scale_stime((__force u64
)stime
,
587 (__force u64
)rtime
, (__force u64
)total
);
588 utime
= rtime
- stime
;
592 * If the tick based count grows faster than the scheduler one,
593 * the result of the scaling may go backward.
594 * Let's enforce monotonicity.
596 prev
->stime
= max(prev
->stime
, stime
);
597 prev
->utime
= max(prev
->utime
, utime
);
604 void task_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
)
606 struct task_cputime cputime
= {
607 .sum_exec_runtime
= p
->se
.sum_exec_runtime
,
610 task_cputime(p
, &cputime
.utime
, &cputime
.stime
);
611 cputime_adjust(&cputime
, &p
->prev_cputime
, ut
, st
);
615 * Must be called with siglock held.
617 void thread_group_cputime_adjusted(struct task_struct
*p
, cputime_t
*ut
, cputime_t
*st
)
619 struct task_cputime cputime
;
621 thread_group_cputime(p
, &cputime
);
622 cputime_adjust(&cputime
, &p
->signal
->prev_cputime
, ut
, st
);
624 #endif /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
626 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
627 static unsigned long long vtime_delta(struct task_struct
*tsk
)
629 unsigned long long clock
;
631 clock
= local_clock();
632 if (clock
< tsk
->vtime_snap
)
635 return clock
- tsk
->vtime_snap
;
638 static cputime_t
get_vtime_delta(struct task_struct
*tsk
)
640 unsigned long long delta
= vtime_delta(tsk
);
642 WARN_ON_ONCE(tsk
->vtime_snap_whence
== VTIME_SLEEPING
);
643 tsk
->vtime_snap
+= delta
;
645 /* CHECKME: always safe to convert nsecs to cputime? */
646 return nsecs_to_cputime(delta
);
649 static void __vtime_account_system(struct task_struct
*tsk
)
651 cputime_t delta_cpu
= get_vtime_delta(tsk
);
653 account_system_time(tsk
, irq_count(), delta_cpu
, cputime_to_scaled(delta_cpu
));
656 void vtime_account_system(struct task_struct
*tsk
)
658 write_seqlock(&tsk
->vtime_seqlock
);
659 __vtime_account_system(tsk
);
660 write_sequnlock(&tsk
->vtime_seqlock
);
663 void vtime_gen_account_irq_exit(struct task_struct
*tsk
)
665 write_seqlock(&tsk
->vtime_seqlock
);
666 __vtime_account_system(tsk
);
667 if (context_tracking_in_user())
668 tsk
->vtime_snap_whence
= VTIME_USER
;
669 write_sequnlock(&tsk
->vtime_seqlock
);
672 void vtime_account_user(struct task_struct
*tsk
)
676 write_seqlock(&tsk
->vtime_seqlock
);
677 delta_cpu
= get_vtime_delta(tsk
);
678 tsk
->vtime_snap_whence
= VTIME_SYS
;
679 account_user_time(tsk
, delta_cpu
, cputime_to_scaled(delta_cpu
));
680 write_sequnlock(&tsk
->vtime_seqlock
);
683 void vtime_user_enter(struct task_struct
*tsk
)
685 write_seqlock(&tsk
->vtime_seqlock
);
686 __vtime_account_system(tsk
);
687 tsk
->vtime_snap_whence
= VTIME_USER
;
688 write_sequnlock(&tsk
->vtime_seqlock
);
691 void vtime_guest_enter(struct task_struct
*tsk
)
694 * The flags must be updated under the lock with
695 * the vtime_snap flush and update.
696 * That enforces a right ordering and update sequence
697 * synchronization against the reader (task_gtime())
698 * that can thus safely catch up with a tickless delta.
700 write_seqlock(&tsk
->vtime_seqlock
);
701 __vtime_account_system(tsk
);
702 current
->flags
|= PF_VCPU
;
703 write_sequnlock(&tsk
->vtime_seqlock
);
705 EXPORT_SYMBOL_GPL(vtime_guest_enter
);
707 void vtime_guest_exit(struct task_struct
*tsk
)
709 write_seqlock(&tsk
->vtime_seqlock
);
710 __vtime_account_system(tsk
);
711 current
->flags
&= ~PF_VCPU
;
712 write_sequnlock(&tsk
->vtime_seqlock
);
714 EXPORT_SYMBOL_GPL(vtime_guest_exit
);
716 void vtime_account_idle(struct task_struct
*tsk
)
718 cputime_t delta_cpu
= get_vtime_delta(tsk
);
720 account_idle_time(delta_cpu
);
723 void arch_vtime_task_switch(struct task_struct
*prev
)
725 write_seqlock(&prev
->vtime_seqlock
);
726 prev
->vtime_snap_whence
= VTIME_SLEEPING
;
727 write_sequnlock(&prev
->vtime_seqlock
);
729 write_seqlock(¤t
->vtime_seqlock
);
730 current
->vtime_snap_whence
= VTIME_SYS
;
731 current
->vtime_snap
= sched_clock_cpu(smp_processor_id());
732 write_sequnlock(¤t
->vtime_seqlock
);
735 void vtime_init_idle(struct task_struct
*t
, int cpu
)
739 write_seqlock_irqsave(&t
->vtime_seqlock
, flags
);
740 t
->vtime_snap_whence
= VTIME_SYS
;
741 t
->vtime_snap
= sched_clock_cpu(cpu
);
742 write_sequnlock_irqrestore(&t
->vtime_seqlock
, flags
);
745 cputime_t
task_gtime(struct task_struct
*t
)
751 seq
= read_seqbegin(&t
->vtime_seqlock
);
754 if (t
->flags
& PF_VCPU
)
755 gtime
+= vtime_delta(t
);
757 } while (read_seqretry(&t
->vtime_seqlock
, seq
));
763 * Fetch cputime raw values from fields of task_struct and
764 * add up the pending nohz execution time since the last
768 fetch_task_cputime(struct task_struct
*t
,
769 cputime_t
*u_dst
, cputime_t
*s_dst
,
770 cputime_t
*u_src
, cputime_t
*s_src
,
771 cputime_t
*udelta
, cputime_t
*sdelta
)
774 unsigned long long delta
;
780 seq
= read_seqbegin(&t
->vtime_seqlock
);
787 /* Task is sleeping, nothing to add */
788 if (t
->vtime_snap_whence
== VTIME_SLEEPING
||
792 delta
= vtime_delta(t
);
795 * Task runs either in user or kernel space, add pending nohz time to
798 if (t
->vtime_snap_whence
== VTIME_USER
|| t
->flags
& PF_VCPU
) {
801 if (t
->vtime_snap_whence
== VTIME_SYS
)
804 } while (read_seqretry(&t
->vtime_seqlock
, seq
));
808 void task_cputime(struct task_struct
*t
, cputime_t
*utime
, cputime_t
*stime
)
810 cputime_t udelta
, sdelta
;
812 fetch_task_cputime(t
, utime
, stime
, &t
->utime
,
813 &t
->stime
, &udelta
, &sdelta
);
820 void task_cputime_scaled(struct task_struct
*t
,
821 cputime_t
*utimescaled
, cputime_t
*stimescaled
)
823 cputime_t udelta
, sdelta
;
825 fetch_task_cputime(t
, utimescaled
, stimescaled
,
826 &t
->utimescaled
, &t
->stimescaled
, &udelta
, &sdelta
);
828 *utimescaled
+= cputime_to_scaled(udelta
);
830 *stimescaled
+= cputime_to_scaled(sdelta
);
832 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */