linux-kernel - [tip:sched/core] sched/numa: Don't scale the imbalance

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Message-ID: <tip-zsriaft1dv7hhboyrpvqjy6s@git.kernel.org>
Date:	Mon, 14 May 2012 06:46:19 -0700
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de
Subject: [tip:sched/core] sched/numa: Don't scale the imbalance

Commit-ID:  870a0bb5d636156502769233d02a0d5791d4366a
Gitweb:     http://git.kernel.org/tip/870a0bb5d636156502769233d02a0d5791d4366a
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Fri, 11 May 2012 00:26:27 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 14 May 2012 15:05:26 +0200

sched/numa: Don't scale the imbalance

It's far too easy to get ridiculously large imbalance pct when you
scale it like that. Use a fixed 125% for now.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/n/tip-zsriaft1dv7hhboyrpvqjy6s@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/core.c |    7 +------
 1 files changed, 1 insertions(+), 6 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 24922b7..6883d99 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6261,11 +6261,6 @@ static int *sched_domains_numa_distance;
 static struct cpumask ***sched_domains_numa_masks;
 static int sched_domains_curr_level;
 
-static inline unsigned long numa_scale(unsigned long x, int level)
-{
-	return x * sched_domains_numa_distance[level] / sched_domains_numa_scale;
-}
-
 static inline int sd_local_flags(int level)
 {
 	if (sched_domains_numa_distance[level] > REMOTE_DISTANCE)
@@ -6286,7 +6281,7 @@ sd_numa_init(struct sched_domain_topology_level *tl, int cpu)
 		.min_interval		= sd_weight,
 		.max_interval		= 2*sd_weight,
 		.busy_factor		= 32,
-		.imbalance_pct		= 100 + numa_scale(25, level),
+		.imbalance_pct		= 125,
 		.cache_nice_tries	= 2,
 		.busy_idx		= 3,
 		.idle_idx		= 2,
--
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