From: Stratos Karafotis <stratosk@semaphore.gr>
Date: Thu, 28 Feb 2013 16:57:32 +0000 (+0000)
Subject: cpufreq: governors: Calculate iowait time only when necessary
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~92^2~1^2~48
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9366d84052e7c5b2eca804c08cfcd00b490f4de2;p=pandora-kernel.git

cpufreq: governors: Calculate iowait time only when necessary

Currently we always calculate the CPU iowait time and add it to idle time.
If we are in ondemand and we use io_is_busy, we re-calculate iowait time
and we subtract it from idle time.

With this patch iowait time is calculated only when necessary avoiding
the double call to get_cpu_iowait_time_us. We use a parameter in
function get_cpu_idle_time to distinguish when the iowait time will be
added to idle time or not, without the need of keeping the prev_io_wait.

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Acked-by: Viresh Kumar <viresh.kumar@linaro.,org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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