From: Josef Bacik <josef@redhat.com>
Date: Thu, 8 Oct 2009 19:30:04 +0000 (-0400)
Subject: Btrfs: optimize fsync for the single writer case
X-Git-Tag: v2.6.32-rc4~7^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ff782e0a131c7f669445c07fe5c7ba91e043b7ed;p=pandora-kernel.git

Btrfs: optimize fsync for the single writer case

This patch optimizes the tree logging stuff so it doesn't always wait 1 jiffie
for new people to join the logging transaction if there is only ever 1 writer.
This helps a little bit with latency where we have something like RPM where it
will fdatasync every file it writes, and so waiting the 1 jiffie for every
fdatasync really starts to add up.

Signed-off-by: Josef Bacik <jbacik@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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