linux-kernel - [RFC PATCH 01/10] sched: entity load-tracking load_avg

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Message-Id: <1348252345-5642-2-git-send-email-morten.rasmussen@arm.com>
Date:	Fri, 21 Sep 2012 19:32:16 +0100
From:	morten.rasmussen@....com
To:	paulmck@...ux.vnet.ibm.com, pjt@...gle.com, peterz@...radead.org,
	suresh.b.siddha@...el.com
Cc:	morten.rasmussen@....com, linaro-sched-sig@...ts.linaro.org,
	linaro-dev@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 01/10] sched: entity load-tracking load_avg_ratio

From: Morten Rasmussen <morten.rasmussen@....com>

This patch adds load_avg_ratio to each task. The load_avg_ratio is a
variant of load_avg_contrib which is not scaled by the task priority. It
is calculated like this:

runnable_avg_sum * NICE_0_LOAD / (runnable_avg_period + 1).

Signed-off-by: Morten Rasmussen <morten.rasmussen@....com>
---
 include/linux/sched.h |    1 +
 kernel/sched/fair.c   |    3 +++
 2 files changed, 4 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4dc4990..81e4e82 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1151,6 +1151,7 @@ struct sched_avg {
 	u64 last_runnable_update;
 	s64 decay_count;
 	unsigned long load_avg_contrib;
+	unsigned long load_avg_ratio;
 	u32 usage_avg_sum;
 };
 
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 095d86c..3e17dd5 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1192,6 +1192,9 @@ static inline void __update_task_entity_contrib(struct sched_entity *se)
 	contrib = se->avg.runnable_avg_sum * scale_load_down(se->load.weight);
 	contrib /= (se->avg.runnable_avg_period + 1);
 	se->avg.load_avg_contrib = scale_load(contrib);
+	contrib = se->avg.runnable_avg_sum * scale_load_down(NICE_0_LOAD);
+	contrib /= (se->avg.runnable_avg_period + 1);
+	se->avg.load_avg_ratio = scale_load(contrib);
 }
 
 /* Compute the current contribution to load_avg by se, return any delta */
-- 
1.7.9.5


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