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

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Message-ID: <50A3DBCD.8010503@redhat.com>
Date:	Wed, 14 Nov 2012 12:58:37 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
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 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 :)

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