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>
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 7b60e39..847ab41 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -309,7 +309,6 @@
else
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
- trace_power_end(0);
} else {
local_irq_enable();
/* loop is done by the caller */
@@ -377,7 +376,6 @@
if (!need_resched())
__mwait(ax, cx);
}
- trace_power_end(0);
}
/* Default MONITOR/MWAIT with no hints, used for default C1 state */
@@ -394,7 +392,6 @@
__sti_mwait(0, 0);
else
local_irq_enable();
- trace_power_end(0);
} else
local_irq_enable();
}
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 8504a21..ad41f19 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 @@
/* give the governor an opportunity to reflect on the outcome */
if (cpuidle_curr_governor->reflect)
cpuidle_curr_governor->reflect(dev);
+ trace_power_end(0);
}
/**