linux-kernel - [PATCH 4/4] omap: cpu: Power tracking support for cgroup cpuacct

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Date:	Tue, 18 May 2010 18:30:20 -0700
From:	Mike Chan <mike@...roid.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	khilman@...prootsystems.com, menage@...gle.com, balbir@...ibm.com,
	cpufreq@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, Mike Chan <mike@...roid.com>
Subject: [PATCH 4/4] omap: cpu: Power tracking support for cgroup cpuacct

Specify new power field in struct omap_opp, which is
power exported in milliWatt.

power_usage function gives power consumed in milliWatt seconds

Signed-off-by: Mike Chan <mike@...roid.com>
---
 arch/arm/plat-omap/cpu-omap.c             |   23 ++++++++++++++++++++++-
 arch/arm/plat-omap/include/plat/omap-pm.h |    1 +
 2 files changed, 23 insertions(+), 1 deletions(-)

diff --git a/arch/arm/plat-omap/cpu-omap.c b/arch/arm/plat-omap/cpu-omap.c
index d27234d..1381539 100644
--- a/arch/arm/plat-omap/cpu-omap.c
+++ b/arch/arm/plat-omap/cpu-omap.c
@@ -22,6 +22,7 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/cpuacct.h>
+#include <linux/math64.h>
 
 #include <mach/hardware.h>
 #include <plat/clock.h>
@@ -218,10 +219,30 @@ static void omap_cpuacct_freq_show(void *cpuacct_data, struct cgroup_map_cb *cb)
 	}
 }
 
+
+/* Returns power (in milliWatt seconds) for cgroup */
+static u64 omap_cpuacct_power_usage(void *cpuacct_data)
+{
+	int i;
+	u64 *cpuacct_freq = cpuacct_data;
+	u64 totalpower = 0;
+
+	/* mpu_opps table starts at 1 */
+	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++)
+		totalpower += cpuacct_freq[i] * mpu_opps[i + 1].power;
+
+	/* milliwatt seconds */
+	totalpower = div64_u64(totalpower, NSEC_PER_SEC);
+
+	return totalpower;
+}
+
+
 static struct cpuacct_cpufreq_calls omap_cpuacct_cpufreq = {
 	.init = omap_cpuacct_freq_init,
 	.charge = omap_cpuacct_freq_charge,
-	.show = omap_cpuacct_freq_show,
+	.cpufreq_show = omap_cpuacct_freq_show,
+	.power_usage = omap_cpuacct_power_usage,
 };
 
 static int __init omap_cpuacct_init(void)
diff --git a/arch/arm/plat-omap/include/plat/omap-pm.h b/arch/arm/plat-omap/include/plat/omap-pm.h
index 3ee41d7..8f2db6f 100644
--- a/arch/arm/plat-omap/include/plat/omap-pm.h
+++ b/arch/arm/plat-omap/include/plat/omap-pm.h
@@ -31,6 +31,7 @@ struct omap_opp {
 	unsigned long rate;
 	u8 opp_id;
 	u16 min_vdd;
+	unsigned long power; /* power consumed running at OPP in milliWatts */
 };
 
 extern struct omap_opp *mpu_opps;
-- 
1.7.0.1

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