linux-kernel - Re: [PATCH 0/7] improve robustness on handling migratetype

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Message-ID: <CAAmzW4PyCp1Hw1ThHGZV5i1wb9494vgpDhZ4h+Gr3Q=pLOojJA@mail.gmail.com>
Date:	Thu, 9 Jan 2014 23:05:04 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Michal Nazarewicz <mina86@...a86.com>
Cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"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 Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/7] improve robustness on handling migratetype

2014/1/9 Michal Nazarewicz <mina86@...a86.com>:
> On Thu, Jan 09 2014, Joonsoo Kim <iamjoonsoo.kim@....com> wrote:
>> Third, there is the problem on buddy allocator. It doesn't consider
>> migratetype when merging buddy, so pages from cma or isolate region can
>> be moved to other migratetype freelist. It makes CMA failed over and over.
>> To prevent it, the buddy allocator should consider migratetype if
>> CMA/ISOLATE is enabled.
>
> There should never be situation where a CMA page shares a pageblock (or
> a max-order page) with a non-CMA page though, so this should never be an
> issue.

Right... It never happens.
When I ported CMA region reservation code to my own code for testing,
I made a mistake. Sorry for noise.

Thanks.
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