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Date: Wed, 14 Nov 2012 12:58:37 -0500
From: Rik van Riel <riel@redhat.com>
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Subject: Re: [PATCH 16/31] mm: numa: Only call task_numa_placement for misplaced
 pages
References: <1352805180-1607-1-git-send-email-mgorman@suse.de> <1352805180-1607-17-git-send-email-mgorman@suse.de>
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To: Mel Gorman <mgorman@suse.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, Andrea Arcangeli <aarcange@redhat.com>, Ingo Molnar <mingo@kernel.org>, Johannes Weiner <hannes@cmpxchg.org>, Hugh Dickins <hughd@google.com>, Thomas Gleixner <tglx@linutronix.de>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>

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@suse.de>

That reads like a premature optimization :)

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