linux-kernel - Re: [RFC][PATCH 25/26] sched, numa: Only migrate long-running entities

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Message-ID: <4FFAF067.3050905@redhat.com>
Date:	Mon, 09 Jul 2012 10:53:27 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dan Smith <danms@...ibm.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 25/26] sched, numa: Only migrate long-running entities

On 07/09/2012 08:26 AM, Peter Zijlstra wrote:
> On Sun, 2012-07-08 at 14:34 -0400, Rik van Riel wrote:

>> Do we really want to calculate the amount of CPU time used
>> by a process, and start migrating after just one second?
>>
>> Or would it be ok to start migrating once a process has
>> been scanned once or twice by the NUMA code?
>
> You mean, the 2-3rd time we try and migrate this task, not the memory
> scanning thing as per Andrea, right?

Indeed.  That way we can simply keep a flag somewhere,
instead of iterating over the threads in a process.

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