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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-02-18 04:28:24 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-03-09 16:41:08 +0300
commitd1db75fffc22504c586c3fae8d602384ea899340 (patch)
treecf2f6613ba88eb244162f8f1ad4fe8be05651ff4 /drivers/cpufreq
parenta33cce1c6cc3268d8b4843bf1e4ac1e70b27d107 (diff)
downloadlinux-d1db75fffc22504c586c3fae8d602384ea899340.tar.xz
cpufreq: ondemand: Rework the handling of powersave bias updates
The ondemand_powersave_bias_init() function used for resetting data fields related to the powersave bias tunable of the ondemand governor works by walking all of the online CPUs in the system and updating the od_cpu_dbs_info_s structures for all of them. However, if governor tunables are per policy, the update should not touch the CPUs that are not associated with the given dbs_data. Moreover, since the data fields in question are only ever used for policy->cpu in each policy governed by ondemand, the update can be limited to those specific CPUs. Rework the code to take the above observations into account. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/cpufreq_ondemand.c30
1 files changed, 13 insertions, 17 deletions
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 216ea442b835..43d89f6af206 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -34,14 +34,6 @@ static struct od_ops od_ops;
static unsigned int default_powersave_bias;
-static void ondemand_powersave_bias_init_cpu(int cpu)
-{
- struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
-
- dbs_info->freq_table = cpufreq_frequency_get_table(cpu);
- dbs_info->freq_lo = 0;
-}
-
/*
* Not all CPUs want IO time to be accounted as busy; this depends on how
* efficient idling at a higher frequency/voltage is.
@@ -120,12 +112,13 @@ static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy,
return freq_hi;
}
-static void ondemand_powersave_bias_init(void)
+static void ondemand_powersave_bias_init(struct cpufreq_policy *policy)
{
- int i;
- for_each_online_cpu(i) {
- ondemand_powersave_bias_init_cpu(i);
- }
+ unsigned int cpu = policy->cpu;
+ struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
+
+ dbs_info->freq_table = cpufreq_frequency_get_table(cpu);
+ dbs_info->freq_lo = 0;
}
static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq)
@@ -306,6 +299,7 @@ static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf,
size_t count)
{
struct od_dbs_tuners *od_tuners = dbs_data->tuners;
+ struct policy_dbs_info *policy_dbs;
unsigned int input;
int ret;
ret = sscanf(buf, "%u", &input);
@@ -317,7 +311,10 @@ static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf,
input = 1000;
od_tuners->powersave_bias = input;
- ondemand_powersave_bias_init();
+
+ list_for_each_entry(policy_dbs, &dbs_data->policy_dbs_list, list)
+ ondemand_powersave_bias_init(policy_dbs->policy);
+
return count;
}
@@ -398,11 +395,10 @@ static void od_exit(struct dbs_data *dbs_data, bool notify)
static void od_start(struct cpufreq_policy *policy)
{
- unsigned int cpu = policy->cpu;
- struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
+ struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu);
dbs_info->sample_type = OD_NORMAL_SAMPLE;
- ondemand_powersave_bias_init_cpu(cpu);
+ ondemand_powersave_bias_init(policy);
}
define_get_cpu_dbs_routines(od_cpu_dbs_info);