linux-kernel - Re: [PATCH 16/31] mm: numa: Only call task_numa

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Message-ID: <20121114181817.GO8218@suse.de>
Date:	Wed, 14 Nov 2012 18:18:17 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Rik van Riel <riel@...hat.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	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 16/31] mm: numa: Only call task_numa_placement for
 misplaced pages

On Wed, Nov 14, 2012 at 12:58:37PM -0500, Rik van Riel wrote:
> On 11/13/2012 06:12 AM, Mel Gorman wrote:
> >task_numa_placement is potentially very expensive so limit it to being
> >called when a page is misplaced. How necessary this is depends on
> >the placement policy.
> >
> >Signed-off-by: Mel Gorman <mgorman@...e.de>
> 
> That reads like a premature optimization :)
> 

Hah, touche.

Will shuffle its location in the series.

-- 
Mel Gorman
SUSE Labs
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