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Date: Mon, 9 Sep 2013 14:53:35 -0500
From: Seth Jennings <sjenning@linux.vnet.ibm.com>
Subject: Re: [RFC PATCH 2/4] mm: use mapcount for identifying zbud pages
Message-ID: <20130909195335.GF4701@variantweb.net>
References: <1377852176-30970-1-git-send-email-k.kozlowski@samsung.com>
 <1377852176-30970-3-git-send-email-k.kozlowski@samsung.com>
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In-Reply-To: <1377852176-30970-3-git-send-email-k.kozlowski@samsung.com>
Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
To: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>, Bob Liu <bob.liu@oracle.com>, Mel Gorman <mgorman@suse.de>, Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>, Marek Szyprowski <m.szyprowski@samsung.com>, Kyungmin Park <kyungmin.park@samsung.com>, Dave Hansen <dave.hansen@intel.com>, Minchan Kim <minchan@kernel.org>

On Fri, Aug 30, 2013 at 10:42:54AM +0200, Krzysztof Kozlowski wrote:
> Currently zbud pages do not have any flags set so it is not possible to
> identify them during migration or compaction.
> 
> Implement PageZbud() by comparing page->_mapcount to -127 to distinguish
> pages allocated by zbud. Just like PageBuddy() is implemented.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

Reviewed-by: Seth Jennings <sjenning@linux.vnet.ibm.com>

> ---
>  include/linux/mm.h |   23 +++++++++++++++++++++++
>  mm/zbud.c          |    4 ++++
>  2 files changed, 27 insertions(+)

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