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| author | Arjan van de Ven <arjan@infradead.org> | 2009-09-19 13:35:33 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-19 18:57:52 +0200 |
| commit | 288f023e708efd89d77ce9acf977a33a623ae83d (patch) | |
| tree | c3fe7d1bcab32f9dcfd16d92b76098ef4c125178 /drivers/cpuidle | |
| parent | 964a0b3d2b1b1cac1d01e29b635831b3d92a3fdd (diff) | |
| download | lwn-288f023e708efd89d77ce9acf977a33a623ae83d.tar.gz lwn-288f023e708efd89d77ce9acf977a33a623ae83d.zip | |
tracing, x86, cpuidle: Move the end point of a C state in the power tracer
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 <arjan@linux.intel.com>
Cc: Len Brown <len.brown@intel.com>
Cc: fweisbec@gmail.com
Cc: peterz@infradead.org
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20090919133533.139c2a46@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/cpuidle')
| -rw-r--r-- | drivers/cpuidle/cpuidle.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 8504a2108557..ad41f19b8e3f 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -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); } /** |