From: Andrea Arcangeli <aarcange@redhat.com>
Date: Tue, 21 Jan 2014 23:48:51 +0000 (-0800)
Subject: mm: hugetlbfs: move the put/get_page slab and hugetlbfs optimization in a faster... 
X-Git-Tag: v3.14-rc1~134^2~86
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ebf360f9bb957f68e19e88f5067c015997dc26a6;p=pandora-kernel.git

mm: hugetlbfs: move the put/get_page slab and hugetlbfs optimization in a faster path

We don't actually need a reference on the head page in the slab and
hugetlbfs paths, as long as we add a smp_rmb() which should be faster
than get_page_unless_zero.

[akpm@linux-foundation.org: fix typo in comment]
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Pravin Shelar <pshelar@nicira.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ben Hutchings <bhutchings@solarflare.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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