linux-kernel - Re: [PATCH 8/7] sched,numa: do not let a move increase the imbalance

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Message-ID: <53AA2C88.1020409@redhat.com>
Date:	Tue, 24 Jun 2014 21:57:28 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	linux-kernel@...r.kernel.org, chegu_vinod@...com, mgorman@...e.de,
	mingo@...nel.org
Subject: Re: [PATCH 8/7] sched,numa: do not let a move increase the imbalance

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On 06/24/2014 10:38 AM, Peter Zijlstra wrote:

>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index
>> 4723234..e98d290 100644 --- a/kernel/sched/fair.c +++
>> b/kernel/sched/fair.c @@ -1314,6 +1314,12 @@ static void
>> task_numa_compare(struct task_numa_env *env,
>> 
>> if (moveimp > imp && moveimp > env->best_imp) { /* +		 * A task
>> swap is possible, do not let a task move +		 * increase the
>> imbalance. +		 */ +		int imbalance_pct = env->imbalance_pct; +
>> env->imbalance_pct = 100; +		/*
> 
> I would feel so much better if we could say _why_ this is so.

OK, I think patch 9 supercedes this one.  The imbalance tests
were buggy, that is what caused the problem.

- -- 
All rights reversed
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