From: Christoph Lameter <clameter@engr.sgi.com>
Date: Wed, 1 Feb 2006 11:05:25 +0000 (-0800)
Subject: [PATCH] Optimize off-node performance of zone reclaim
X-Git-Tag: v2.6.16-rc2~116
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8928862398fef04a137e5673ac5fa9e797960c87;p=pandora-kernel.git

[PATCH] Optimize off-node performance of zone reclaim

Ensure that the performance of off node pages stays the same as before.
Off node pagefault tests showed an 18% drop in performance without this
patch.

- Increase the timeout to 30 seconds to reduce the overhead.

- Move all code possible out of the off node hot path for zone reclaim
  (Sorry Andrew, the struct initialization had to be sacrificed).
  The read_page_state() bit us there.

- Check first for the timeout before any other checks.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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