linux-kernel - Re: [PATCH 05/17] mm: page_alloc: Only check the zone id check if pages are buddies

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Date:	Tue, 06 May 2014 12:48:50 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>, Linux-MM <linux-mm@...ck.org>,
	Linux-FSDevel <linux-fsdevel@...r.kernel.org>
CC:	Johannes Weiner <hannes@...xchg.org>,
	Vlastimil Babka <vbabka@...e.cz>, Jan Kara <jack@...e.cz>,
	Michal Hocko <mhocko@...e.cz>, Hugh Dickins <hughd@...gle.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/17] mm: page_alloc: Only check the zone id check if
 pages are buddies

On 05/01/2014 04:44 AM, Mel Gorman wrote:
> A node/zone index is used to check if pages are compatible for merging
> but this happens unconditionally even if the buddy page is not free. Defer
> the calculation as long as possible. Ideally we would check the zone boundary
> but nodes can overlap.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>
> Acked-by: Johannes Weiner <hannes@...xchg.org>

Acked-by: Rik van Riel <riel@...hat.com>

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