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

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Date:	Tue, 11 Mar 2014 16:28:45 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Rik van Riel <riel@...hat.com>,
	Sasha Levin <sasha.levin@...cle.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 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.

-- 
Mel Gorman
SUSE Labs
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