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sched: monitor clock underflows in /proc/sched_debug

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We monitor clock overflows, let's also monitor clock underflows.

Signed-off-by: Guillaume Chazarain <guichaz@yahoo.fr>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Guillaume Chazarain
2008-01-25 21:08:34 +01:00
committed by Ingo Molnar
parent 782daeee3d
commit cc203d2422
2 changed files with 5 additions and 2 deletions
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6
kernel/sched.c
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@@ -465,7 +465,7 @@ struct rq {
u64 clock, prev_clock_raw;
s64 clock_max_delta;
unsigned int clock_warps, clock_overflows;
unsigned int clock_warps, clock_overflows, clock_underflows;
u64 idle_clock;
unsigned int clock_deep_idle_events;
u64 tick_timestamp;
@@ -3736,8 +3736,10 @@ void scheduler_tick(void)
/*
* Let rq->clock advance by at least TICK_NSEC:
*/
if (unlikely(rq->clock < next_tick))
if (unlikely(rq->clock < next_tick)) {
rq->clock = next_tick;
rq->clock_underflows++;
}
rq->tick_timestamp = rq->clock;
update_cpu_load(rq);
curr->sched_class->task_tick(rq, curr, 0);