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tracing, x86, cpuidle: Move the end point of a C state in the power tracer

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The "end of a C state" trace point currently happens before
the code runs that corrects the TSC for having stopped during idle.

The result of this is that the timestamp of the end-of-C-state event
is garbage on cpus where the TSC stops during idle.

This patch moves the end point of the C state to after the timekeeping
engine of the kernel has been corrected.

Signed-off-by: Arjan van de Ven <[email protected]>
Cc: Len Brown <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Paul Mackerras <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Arjan van de Ven 2009-09-19 13:35:33 +02:00 • committed by Ingo Molnar
commit 288f023e70
2 changed files with 2 additions and 3 deletions
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2
drivers/cpuidle/cpuidle.c
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@ -17,6 +17,7 @@
#include <linux/cpuidle.h>
#include <linux/ktime.h>
#include <linux/hrtimer.h>
#include <trace/events/power.h>
#include "cpuidle.h"
@ -91,6 +92,7 @@ static void cpuidle_idle_call(void)
/* give the governor an opportunity to reflect on the outcome */
if (cpuidle_curr_governor->reflect)
cpuidle_curr_governor->reflect(dev);
trace_power_end(0);
}
/**