From: Dave Chinner <dgc@sgi.com>
Date: Tue, 24 Nov 2009 18:03:15 +0000 (+0000)
Subject: xfs: improve metadata I/O merging in the elevator
X-Git-Tag: v2.6.33-rc1~41^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2ee1abad73a12df5521cd3f017f081f1f684a361;p=pandora-kernel.git

xfs: improve metadata I/O merging in the elevator

Change all async metadata buffers to use [READ|WRITE]_META I/O types
so that the I/O doesn't get issued immediately. This allows merging of
adjacent metadata requests but still prioritises them over bulk data.
This shows a 10-15% improvement in sequential create speed of small
files.

Don't include the log buffers in this classification - leave them as
sync types so they are issued immediately.

Signed-off-by: Dave Chinner <dgc@sgi.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
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