linux-kernel - Re: [PATCH 6/7] mm/page_alloc: store freelist migratetype to the page on buddy properly

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Message-ID: <xa1t8uupbjgv.fsf@mina86.com>
Date:	Thu, 09 Jan 2014 10:19:44 +0100
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Jiang Liu <jiang.liu@...wei.com>, Mel Gorman <mgorman@...e.de>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Minchan Kim <minchan@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	Tang Chen <tangchen@...fujitsu.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 6/7] mm/page_alloc: store freelist migratetype to the page on buddy properly

On Thu, Jan 09 2014, Joonsoo Kim wrote:
> To maintain freelist migratetype information on buddy pages, migratetype
> should be set again whenever the page order is changed. set_page_order()
> is the best place to do, because it is called whenever the page order is
> changed, so this patch adds set_buddy_migratetype() to set_page_order().
>
> And this patch makes set/get_buddy_migratetype() only enabled if it is
> really needed, because it has some overhead.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Michal Nazarewicz <mina86@...a86.com>


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