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Commit c11420a6 authored by Dave Jones's avatar Dave Jones
Browse files

[CPUFREQ] Prevents un-necessary cpufreq changes if we are already at min/max 



Signed-off-by: default avatarAlexander Clouter <alex-kernel@digriz.org.uk>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent 3d5ee9e5

drivers/cpufreq/cpufreq_ondemand.c

+8 −0
Original line number Diff line number Diff line
@@ -333,6 +333,10 @@ static void dbs_check_cpu(int cpu) 
			usecs_to_jiffies(dbs_tuners_ins.sampling_rate);



	if (idle_ticks < up_idle_ticks) {

		/* if we are already at full speed then break out early */

		if (policy->cur == policy->max)

			return;

		

		__cpufreq_driver_target(policy, policy->max, 

			CPUFREQ_RELATION_H);

		down_skip[cpu] = 0;
@@ -386,6 +390,10 @@ static void dbs_check_cpu(int cpu) 
			usecs_to_jiffies(freq_down_sampling_rate);



	if (idle_ticks > down_idle_ticks ) {

		/* if we are already at the lowest speed then break out early */

		if (policy->cur == policy->min)

			return;

		

		freq_down_step = (5 * policy->max) / 100;



		/* max freq cannot be less than 100. But who knows.... */