From: Divyesh Shah <dpshah@google.com>
Date: Fri, 9 Apr 2010 04:15:10 +0000 (-0700)
Subject: blkio: Add io_queued and avg_queue_size stats
X-Git-Tag: v2.6.35-rc1~442^2~82
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cdc1184cf4a7bd99f5473a91244197accc49146b;p=pandora-kernel.git

blkio: Add io_queued and avg_queue_size stats

These stats are useful for getting a feel for the queue depth of the cgroup,
i.e., how filled up its queues are at a given instant and over the existence of
the cgroup. This ability is useful when debugging problems in the wild as it
helps understand the application's IO pattern w/o having to read through the
userspace code (coz its tedious or just not available) or w/o the ability
to run blktrace (since you may not have root access and/or not want to disturb
performance).

Signed-off-by: Divyesh Shah<dpshah@google.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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