linux-kernel - Re: Suspicious error for CMA stress test

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Date:	Wed, 23 Mar 2016 17:32:43 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Hanjun Guo <guohanjun@...wei.com>,
	"Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>,
	Laura Abbott <labbott@...hat.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	qiuxishi <qiuxishi@...wei.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Arnd Bergmann <arnd@...db.de>,
	dingtinahong <dingtianhong@...wei.com>, chenjie6@...wei.com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Lucas Stach <l.stach@...gutronix.de>
Subject: Re: Suspicious error for CMA stress test

2016-03-23 17:26 GMT+09:00 Vlastimil Babka <vbabka@...e.cz>:
> On 03/23/2016 05:44 AM, Joonsoo Kim wrote:
>>>
>>>
>>> Fixes: 3c605096d315 ("mm/page_alloc: restrict max order of merging on
>>> isolated pageblock")
>>> Link: https://lkml.org/lkml/2016/3/2/280
>>> Reported-by: Hanjun Guo <guohanjun@...wei.com>
>>> Debugged-by: Laura Abbott <labbott@...hat.com>
>>> Debugged-by: Joonsoo Kim <iamjoonsoo.kim@....com>
>>> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
>>> Cc: <stable@...r.kernel.org> # 3.18+
>>> ---
>>>   mm/page_alloc.c | 46 +++++++++++++++++++++++++++++++++-------------
>>>   1 file changed, 33 insertions(+), 13 deletions(-)
>>
>>
>> Acked-by: Joonsoo Kim <iamjoonsoo.kim@....com>
>>
>> Thanks for taking care of this issue!.
>
>
> Thanks for the review. But I'm now not sure whether we push this to
> mainline+stable now, and later replace with Lucas' approach, or whether that
> approach would be also suitable and non-disruptive enough for stable?

Lucas' approach is for improvement and would be complex rather than
this. I don't think it would be appropriate for stable. IMO, it's better to push
this to mainline + stable now.

Thanks.