From: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Date: Wed, 12 Dec 2012 21:51:05 +0000 (-0800)
Subject: thp: lazy huge zero page allocation
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~33^2~43
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=78ca0e679203bbf74f8febd9725a1c8dd083d073;p=pandora-kernel.git

thp: lazy huge zero page allocation

Instead of allocating huge zero page on hugepage_init() we can postpone it
until first huge zero page map. It saves memory if THP is not in use.

cmpxchg() is used to avoid race on huge_zero_pfn initialization.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@linux.intel.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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