From: Nick Piggin <npiggin@suse.de>
Date: Sun, 19 Oct 2008 03:26:57 +0000 (-0700)
Subject: mm: pagecache insertion fewer atomics
X-Git-Tag: v2.6.28-rc1~220
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f45840b5c128445da70e7ec33adc47b4a12bdaf4;p=pandora-kernel.git

mm: pagecache insertion fewer atomics

Setting and clearing the page locked when inserting it into swapcache /
pagecache when it has no other references can use non-atomic page flags
operations because no other CPU may be operating on it at this time.

This saves one atomic operation when inserting a page into pagecache.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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