linux-kernel - Re: [PATCH 2/2] mm/page_alloc: DEBUG_VM checks for free

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Message-ID: <537330D6.7040802@suse.cz>
Date:	Wed, 14 May 2014 11:01:10 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Hugh Dickins <hughd@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Mel Gorman <mgorman@...e.de>,
	Yong-Taek Lee <ytk.lee@...sung.com>,
	Minchan Kim <minchan@...nel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Rik van Riel <riel@...hat.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Dave Jones <davej@...hat.com>
Subject: Re: [PATCH 2/2] mm/page_alloc: DEBUG_VM checks for free_list placement
 of CMA and RESERVE pages

On 05/14/2014 07:19 AM, Hugh Dickins wrote:
> On Tue, 13 May 2014, Sasha Levin wrote:
>> On 05/05/2014 11:50 AM, Vlastimil Babka wrote:
>>> So in the end this VM_DEBUG check probably cannot work anymore for MIGRATE_RESERVE, only for CMA. I'm not sure if it's worth keeping it only for CMA, what are the CMA guys' opinions on that?
>>
>> The way I understood it is that this patch is wrong, but it's still
>> alive in -mm. Should it still be there?
>
> I agree that it should be dropped.  I did not follow the discussion,
> but mmotm soon gives me BUG at mm/page_alloc.c:1242 under swapping load.

Yes, I have already asked for dropping, and updating message of PATCH 
1/2 at http://marc.info/?l=linux-mm&m=139947475413079&w=2

Vlastimil

> Hugh
>

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