From: Mel Gorman <mgorman@suse.de>
Date: Thu, 19 Dec 2013 01:08:36 +0000 (-0800)
Subject: mm: numa: do not clear PMD during PTE update scan
X-Git-Tag: v3.13-rc5~23^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5a6dac3ec5f583cc8ee7bc53b5500a207c4ca433;p=pandora-kernel.git

mm: numa: do not clear PMD during PTE update scan

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.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Alex Thorlton <athorlton@sgi.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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