linux-kernel - [RFC PATCH 1/4] sched: shortcut to remove load

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Message-Id: <1385102235-25664-2-git-send-email-alex.shi@linaro.org>
Date:	Fri, 22 Nov 2013 14:37:12 +0800
From:	Alex Shi <alex.shi@...aro.org>
To:	mingo@...hat.com, peterz@...radead.org, morten.rasmussen@....com,
	vincent.guittot@...aro.org, daniel.lezcano@...aro.org,
	fweisbec@...il.com, linux@....linux.org.uk, tony.luck@...el.com,
	fenghua.yu@...el.com, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, pjt@...gle.com,
	fengguang.wu@...el.com
Cc:	james.hogan@...tec.com, alex.shi@...aro.org, jason.low2@...com,
	gregkh@...uxfoundation.org, hanjun.guo@...aro.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 1/4] sched: shortcut to remove load_idx effect

Shortcut to remove rq->cpu_load[load_idx] effect in scheduler.
In five load idx, only busy_idx, idle_idx are not zero.
Newidle_idx, wake_idx and fork_idx are all zero in all archs.

So, change the idx to zero here can fully remove load_idx.

Signed-off-by: Alex Shi <alex.shi@...aro.org>
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e8b652e..ce683aa 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5633,7 +5633,7 @@ static inline void update_sd_lb_stats(struct lb_env *env, struct sd_lb_stats *sd
 	if (child && child->flags & SD_PREFER_SIBLING)
 		prefer_sibling = 1;
 
-	load_idx = get_sd_load_idx(env->sd, env->idle);
+	load_idx = 0;
 
 	do {
 		struct sg_lb_stats *sgs = &tmp_sgs;
-- 
1.8.1.2

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