From: Michal Nazarewicz <mina86@mina86.com>
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrew Morton <akpm@linux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Rik van Riel <riel@redhat.com>, Jiang Liu <jiang.liu@huawei.com>,
        Mel Gorman <mgorman@suse.de>, Cody P Schafer <cody@linux.vnet.ibm.com>,
        Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>,
        Minchan Kim <minchan@kernel.org>, Andi Kleen <ak@linux.intel.com>,
        Wei Yongjun <yongjun_wei@trendmicro.com.cn>,
        Tang Chen <tangchen@cn.fujitsu.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, Joonsoo Kim <js1304@gmail.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: Re: [PATCH 5/7] mm/page_alloc: separate interface to set/get migratetype of freepage
In-Reply-To: <1389251087-10224-6-git-send-email-iamjoonsoo.kim@lge.com>
Organization: http://mina86.com/
References: <1389251087-10224-1-git-send-email-iamjoonsoo.kim@lge.com> <1389251087-10224-6-git-send-email-iamjoonsoo.kim@lge.com>
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Date: Thu, 09 Jan 2014 10:18:00 +0100
Message-ID: <xa1tbnzlbjjr.fsf@mina86.com>
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On Thu, Jan 09 2014, Joonsoo Kim wrote:
> Currently, we use (set/get)_freepage_migratetype in two use cases.
> One is to know the buddy list where this page will be linked and
> the other is to know the buddy list where this page is linked now.
>
> But, we should deal these two use cases differently, because information
> isn't sufficient for the second use case and properly setting this
> information needs some overhead. Whenever the page is merged or split
> in buddy, this information isn't properly re-assigned and it may not
> have enough information for the second use case.
>
> This patch just separates interface, so there is no functional change.
> Following patch will do further steps about this issue.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>

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

I think this patch would be smaller if it was pushed earlier in the
patchset.

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Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=3D./ `o
..o | Computer Science,  Micha=C5=82 =E2=80=9Cmina86=E2=80=9D Nazarewicz   =
 (o o)
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