linux-kernel - Re: [PATCH 04/18] mm: numa: Do not clear PMD during PTE update scan

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Message-ID: <52A5D20F.4010702@redhat.com>
Date:	Mon, 09 Dec 2013 09:22:07 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Alex Thorlton <athorlton@....com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/18] mm: numa: Do not clear PMD during PTE update scan

On 12/09/2013 02:08 AM, Mel Gorman wrote:
> If the PMD is flushed then a parallel fault in handle_mm_fault() will enter
> the pmd_none and do_huge_pmd_anonymous_page() path where it'll attempt
> to insert a huge zero page. This is wasteful so the patch avoids clearing
> the PMD when setting pmd_numa.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Reviewed-by: Rik van Riel <riel@...hat.com>


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