From: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Date: Tue, 26 May 2009 22:27:12 +0000 (+0900)
Subject: nilfs2: enable sync_page method
X-Git-Tag: v2.6.31-rc1~333^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e85dc1d5295779d2e6d973b7ed524d6bd3825a3f;p=pandora-kernel.git

nilfs2: enable sync_page method

This adds a missing sync_page method which unplugs bio requests when
waiting for page locks. This will improve read performance of nilfs.

Here is a measurement result using dd command.

Without this patch:

 # mount -t nilfs2 /dev/sde1 /test
 # dd if=/test/aaa of=/dev/null bs=512k
 1024+0 records in
 1024+0 records out
 536870912 bytes (537 MB) copied, 6.00688 seconds, 89.4 MB/s

With this patch:

 # mount -t nilfs2 /dev/sde1 /test
 # dd if=/test/aaa of=/dev/null bs=512k
 1024+0 records in
 1024+0 records out
 536870912 bytes (537 MB) copied, 3.54998 seconds, 151 MB/s

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
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