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| author | Dave Jones | 2005-06-01 04:03:48 +0200 |
|---|---|---|
| committer | Dave Jones | 2005-06-01 04:03:48 +0200 |
| commit | c11420a616039e2181e4ecbffb4d125d39e6877d (patch) | |
| tree | 413a30af85846567ea326d42e38ba40153b73bce /drivers/cpufreq | |
| parent | [CPUFREQ] Add support to cpufreq_ondemand to ignore 'nice' cpu time (diff) | |
| download | kernel-qcow2-linux-c11420a616039e2181e4ecbffb4d125d39e6877d.tar.gz kernel-qcow2-linux-c11420a616039e2181e4ecbffb4d125d39e6877d.tar.xz kernel-qcow2-linux-c11420a616039e2181e4ecbffb4d125d39e6877d.zip | |
[CPUFREQ] Prevents un-necessary cpufreq changes if we are already at min/max
Signed-off-by: Alexander Clouter <alex-kernel@digriz.org.uk>
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/cpufreq_ondemand.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index 7d7244314ac9..6dc83808e590 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -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.... */ |