linux-kernel - Re: [PATCH] tracing, perf: add more power related events

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Date:	Sat, 18 Sep 2010 00:10:16 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Jean Pihet <jean.pihet@...oldbits.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Len Brown <len.brown@...el.com>, arjan@...radead.org,
	Kevin Hilman <khilman@...prootsystems.com>,
	linux-kernel@...r.kernel.org, discuss@...swatts.org,
	linux-pm@...ts.linux-foundation.org, linux-omap@...r.kernel.org,
	linux-perf-users@...r.kernel.org, linux-trace-users@...r.kernel.org
Subject: Re: [PATCH] tracing, perf: add more power related events

power-trace: Add x86 ACPI S- (machine sleep) state events.

Signed-off-by: Thomas Renninger <trenn@...e.de>

---
 drivers/acpi/sleep.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

Index: linux-2.6.35-master/drivers/acpi/sleep.c
===================================================================
--- linux-2.6.35-master.orig/drivers/acpi/sleep.c
+++ linux-2.6.35-master/drivers/acpi/sleep.c
@@ -17,6 +17,8 @@
 #include <linux/suspend.h>
 #include <linux/reboot.h>
 
+#include <trace/events/power.h>
+
 #include <asm/io.h>
 
 #include <acpi/acpi_bus.h>
@@ -249,14 +251,19 @@ static int acpi_suspend_enter(suspend_st
 	unsigned long flags = 0;
 	u32 acpi_state = acpi_target_sleep_state;
 
+	trace_power_switch_state(POWER_SSTATE, acpi_state, 0);
+
 	ACPI_FLUSH_CPU_CACHE();
 
 	/* Do arch specific saving of state. */
 	if (acpi_state == ACPI_STATE_S3) {
 		int error = acpi_save_state_mem();
 
-		if (error)
+		if (error) {
+			trace_power_switch_state(POWER_SSTATE,
+						 ACPI_STATE_S0, 0);
 			return error;
+		}
 	}
 
 	local_irq_save(flags);
@@ -309,6 +316,8 @@ static int acpi_suspend_enter(suspend_st
 
 	suspend_nvs_restore();
 
+	trace_power_switch_state(POWER_SSTATE, ACPI_STATE_S0, 0);
+
 	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 }
 
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