From 7af1c0568d33339318c6710381921a3a3d40eebb Mon Sep 17 00:00:00 2001 From: Stratos Karafotis Date: Tue, 5 Mar 2013 22:06:29 +0000 Subject: cpufreq: conservative: Fix sampling_down_factor functionality sampling_down_factor tunable is unused since commit 8e677ce83bf41ba9c74e5b6d9ee60b07d4e5ed93 (4 years ago). This patch restores the original functionality and documents the tunable. Signed-off-by: Stratos Karafotis Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq_conservative.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c index 52f76b19a883..d746d6abbca8 100644 --- a/drivers/cpufreq/cpufreq_conservative.c +++ b/drivers/cpufreq/cpufreq_conservative.c @@ -36,9 +36,9 @@ static DEFINE_PER_CPU(struct cs_cpu_dbs_info_s, cs_cpu_dbs_info); /* * Every sampling_rate, we check, if current idle time is less than 20% - * (default), then we try to increase frequency Every sampling_rate * - * sampling_down_factor, we check, if current idle time is more than 80%, then - * we try to decrease frequency + * (default), then we try to increase frequency. Every sampling_rate * + * sampling_down_factor, we check, if current idle time is more than 80% + * (default), then we try to decrease frequency * * Any frequency increase takes it to the maximum frequency. Frequency reduction * happens at minimum steps of 5% (default) of maximum frequency @@ -81,6 +81,11 @@ static void cs_check_cpu(int cpu, unsigned int load) return; } + /* if sampling_down_factor is active break out early */ + if (++dbs_info->down_skip < cs_tuners->sampling_down_factor) + return; + dbs_info->down_skip = 0; + /* * The optimal frequency is the frequency that is the lowest that can * support the current CPU usage without triggering the up policy. To be -- cgit v1.2.1