linux-kernel - Re: [PATCH 08/16] sched: Reschedule task on preferred NUMA node once selected

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Message-ID: <20130712101408.GV25631@dyad.programming.kicks-ass.net>
Date:	Fri, 12 Jul 2013 12:14:08 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/16] sched: Reschedule task on preferred NUMA node once
 selected

On Thu, Jul 11, 2013 at 03:09:14PM +0100, Mel Gorman wrote:
> That might be necessary when the machine is overloaded. As a
> starting point the following should retry the migrate a number of times
> until success. The retry is checked on every fault but should not fire
> more than once every 100ms.
 
Yeah, something like that might work. But getting a working imbalance bound is
important. The current very weak direct migration is the only thing that keeps
the system from massively skewing load.
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