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authorMorten Rasmussen <Morten.Rasmussen@arm.com>2012-09-14 14:38:08 +0100
committerViresh Kumar <viresh.kumar@linaro.org>2013-02-11 10:38:13 +0530
commit334b140cbf1e76a33131d1b0a2644bd92999250a (patch)
treeb7927dec683f418cd0b1e0d32d13014bcc00e97a
parent76d564e0588d72f06e4b5a05f094effe311afab2 (diff)
downloadvexpress-lsk-334b140cbf1e76a33131d1b0a2644bd92999250a.tar.gz
sched: entity load-tracking load_avg_ratio
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@arm.com>
-rw-r--r--include/linux/sched.h1
-rw-r--r--kernel/sched/fair.c3
2 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 58f8020dd76..995e5d33743 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1132,6 +1132,7 @@ 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 68ffdd396fe..b752af9ab08 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1427,6 +1427,9 @@ 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 */