From: Joe Thornber <ejt@redhat.com>
Date: Fri, 15 May 2015 12:45:30 +0000 (+0100)
Subject: dm cache: add io_tracker
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~145^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=77289d32073c4eac57fcca2abe6caefc6f3dc7d6;p=pandora-kernel.git

dm cache: add io_tracker

A little class that keeps track of the volume of io that is in flight,
and the length of time that a device has been idle for.

FIXME: rather than jiffes, may be best to use ktime_t (to support faster
devices).

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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