linux-kernel - Re: [PATCH 36/46] mm: numa: Use a two-stage filter to restrict pages being migrated for unlikely task<->node relationships

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Message-ID: <20121122000521.GA7859@gmail.com>
Date:	Thu, 22 Nov 2012 01:05:21 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	Mel Gorman <mgorman@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Alex Shi <lkml.alex@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 36/46] mm: numa: Use a two-stage filter to restrict pages
 being migrated for unlikely task<->node relationships


* Rik van Riel <riel@...hat.com> wrote:

> On 11/21/2012 02:15 PM, Mel Gorman wrote:
> >On Wed, Nov 21, 2012 at 07:25:37PM +0100, Ingo Molnar wrote:
> 
> >>As mentioned in my other mail, this patch of yours looks very
> >>similar to the numa/core commit attached below, mostly written
> >>by Peter:
> >>
> >>   30f93abc6cb3 sched, numa, mm: Add the scanning page fault machinery
> 
> >Just to compare, this is the wording in "autonuma: memory follows CPU
> >algorithm and task/mm_autonuma stats collection"
> >
> >+/*
> >+ * In this function we build a temporal CPU_node<->page relation by
> >+ * using a two-stage autonuma_last_nid filter to remove short/unlikely
> >+ * relations.
> 
> Looks like the comment came from sched/numa, but the original 
> code came from autonuma:
> 
> https://lkml.org/lkml/2012/8/22/629

Yeah, indeed, good find - thanks for tracking that down - to me 
it came from Peter. I'll add in an explicit credit to Andrea, 
the comment alone deserves one!

Thanks,

	Ingo
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