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SubjectPatch for tracing c states (power_end) on x86
From
Date
Hello,

Since noone replied to my last mail (Febr. 15th, 11:42), describing the
way to fix the missing c-state tracing, here's a patch.
Maybe its easier that way.

(I used the perf-fixes-for-linus git tree to obtain a
more-then-up-to-date version)

Bye Robert


diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 02d6780..b1cfb88 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -384,6 +384,7 @@ void default_idle(void)
else
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
+ trace_power_end(1);
} else {
local_irq_enable();
/* loop is done by the caller */
@@ -451,6 +452,7 @@ void mwait_idle_with_hints(unsigned long ax,
unsigned long cx)
if (!need_resched())
__mwait(ax, cx);
}
+ trace_power_end((ax>>4)+1);
}

/* Default MONITOR/MWAIT with no hints, used for default C1 state */
@@ -467,6 +469,7 @@ static void mwait_idle(void)
__sti_mwait(0, 0);
else
local_irq_enable();
+ trace_power_end(1);
} else
local_irq_enable();
}



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