From: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Date: Mon, 22 Jun 2009 09:12:28 +0000 (+0100)
Subject: dm mpath: add service time load balancer
X-Git-Tag: v2.6.31-rc1~8^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f392ba889b019602976082bfe7bf486c2594f85c;p=pandora-kernel.git

dm mpath: add service time load balancer

This patch adds a service time oriented dynamic load balancer,
dm-service-time, which selects the path with the shortest estimated
service time for the incoming I/O.
The service time is estimated by dividing the in-flight I/O size
by a performance value of each path.

The performance value can be given as a table argument at the table
loading time.  If no performance value is given, all paths are
considered equal.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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