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sched/idle: Move latency tracing stop/start calls deeper inside the idle loop

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Make sure to stop tracing only once we are past a point where
all latency tracing events have been processed (irqs are not
enabled again). This has the slight advantage of capturing more
latency related events in the idle path, but most importantly it
makes sure that latency tracing doesn't get re-enabled
inadvertently when new events are coming in.

This makes the irqsoff latency tracer useful again, as we stop
capturing CPU sleep time as IRQ latency.

Signed-off-by: Lucas Stach <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Lucas Stach 2015-07-20 18:34:50 +02:00 • committed by Ingo Molnar
commit 63caae8480
2 changed files with 9 additions and 9 deletions
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4
drivers/cpuidle/cpuidle.c
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@ -118,6 +118,7 @@ static void enter_freeze_proper(struct cpuidle_driver *drv,
* cpuidle mechanism enables interrupts and doing that with timekeeping
* suspended is generally unsafe.
*/
stop_critical_timings();
drv->states[index].enter_freeze(dev, drv, index);
WARN_ON(!irqs_disabled());
/*
@ -126,6 +127,7 @@ static void enter_freeze_proper(struct cpuidle_driver *drv,
* critical sections, so tell RCU about that.
*/
RCU_NONIDLE(tick_unfreeze());
start_critical_timings();
}
/**
@ -190,7 +192,9 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
trace_cpu_idle_rcuidle(index, dev->cpu);
time_start = ktime_get();
stop_critical_timings();
entered_state = target_state->enter(dev, drv, index);
start_critical_timings();
time_end = ktime_get();
trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu);