cpufreq: governors: Avoid unnecessary per cpu timer interrupts
authorViresh Kumar <viresh.kumar@linaro.org>
Wed, 27 Feb 2013 06:54:03 +0000 (12:24 +0530)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Sun, 31 Mar 2013 23:11:35 +0000 (01:11 +0200)
commit031299b3be30f3ecab110fff8faad85af70e1797
tree3e823df16db43dffbf14b7895811059e22427a1e
parent9d44592018e617abf62a5f6a5d92a04aa07e7625
cpufreq: governors: Avoid unnecessary per cpu timer interrupts

Following patch has introduced per cpu timers or works for ondemand and
conservative governors.

commit 2abfa876f1117b0ab45f191fb1f82c41b1cbc8fe
Author: Rickard Andersson <rickard.andersson@stericsson.com>
Date:   Thu Dec 27 14:55:38 2012 +0000

    cpufreq: handle SW coordinated CPUs

This causes additional unnecessary interrupts on all cpus when the load is
recently evaluated by any other cpu. i.e. When load is recently evaluated by cpu
x, we don't really need any other cpu to evaluate this load again for the next
sampling_rate time.

Some sort of code is present to avoid that but we are still getting timer
interrupts for all cpus. A good way of avoiding this would be to modify delays
for all cpus (policy->cpus) whenever any cpu has evaluated load.

This patch does this change and some related code cleanup.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
drivers/cpufreq/cpufreq_conservative.c
drivers/cpufreq/cpufreq_governor.c
drivers/cpufreq/cpufreq_governor.h
drivers/cpufreq/cpufreq_ondemand.c