linux-kernel - Re: [PATCH -mm] mm,numa,mprotect: always continue after finding a stable thp page

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Message-ID: <531F3F15.8050206@oracle.com>
Date:	Tue, 11 Mar 2014 12:51:33 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>
CC:	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, hhuang@...hat.com,
	knoel@...hat.com, aarcange@...hat.com
Subject: Re: [PATCH -mm] mm,numa,mprotect: always continue after finding a
 stable thp page

On 03/11/2014 12:28 PM, Mel Gorman wrote:
> On Fri, Mar 07, 2014 at 06:27:45PM +0000, Mel Gorman wrote:
>>> This is a completely untested prototype. It rechecks pmd_trans_huge
>>> under the lock and falls through if it hit a parallel split. It's not
>>> perfect because it could decide to fall through just because there was
>>> no prot_numa work to do but it's for illustration purposes. Secondly,
>>> I noted that you are calling invalidate for every pmd range. Is that not
>>> a lot of invalidations? We could do the same by just tracking the address
>>> of the first invalidation.
>>>
>>
>> And there were other minor issues. This is still untested but Sasha,
>> can you try it out please? I discussed this with Rik on IRC for a bit and
>> reckon this should be sufficient if the correct race has been identified.
>>
>
> Any luck with this patch Sasha? It passed basic tests here but I had not
> seen the issue trigger either.
>

Sorry, I've been stuck in my weekend project of getting lockdep to work with page locks :)

It takes a moment to test, so just to be sure - I should have only this last patch applied?
Without the one in the original mail?


Thanks,
Sasha
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