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cpufreq: governor: Keep single copy of information common to policy->cpus

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Some information is common to all CPUs belonging to a policy, but are
kept on per-cpu basis. Lets keep that in another structure common to all
policy->cpus. That will make updates/reads to that less complex and less
error prone.

The memory for cpu_common_dbs_info is allocated/freed at INIT/EXIT, so
that it we don't reallocate it for STOP/START sequence. It will be also
be used (in next patch) while the governor is stopped and so must not be
freed that early.

Reviewed-and-tested-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar
2015-07-18 11:30:59 +05:30
committed by Rafael J. Wysocki
parent 42994af63c
commit 44152cb82d
4 changed files with 114 additions and 58 deletions
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drivers/cpufreq/cpufreq_governor.h
+15 -9
View File
@@ -128,6 +128,18 @@ static void *get_cpu_dbs_info_s(int cpu) \
* cs_*: Conservative governor
*/
/* Common to all CPUs of a policy */
struct cpu_common_dbs_info {
struct cpufreq_policy *policy;
/*
* percpu mutex that serializes governor limit change with gov_dbs_timer
* invocation. We do not want gov_dbs_timer to run when user is changing
* the governor or limits.
*/
struct mutex timer_mutex;
ktime_t time_stamp;
};
/* Per cpu structures */
struct cpu_dbs_info {
u64 prev_cpu_idle;
@@ -140,15 +152,8 @@ struct cpu_dbs_info {
* wake-up from idle.
*/
unsigned int prev_load;
struct cpufreq_policy *policy;
struct delayed_work dwork;
/*
* percpu mutex that serializes governor limit change with gov_dbs_timer
* invocation. We do not want gov_dbs_timer to run when user is changing
* the governor or limits.
*/
struct mutex timer_mutex;
ktime_t time_stamp;
struct cpu_common_dbs_info *shared;
};
struct od_cpu_dbs_info_s {
@@ -264,7 +269,8 @@ static ssize_t show_sampling_rate_min_gov_pol \
extern struct mutex cpufreq_governor_lock;
void dbs_check_cpu(struct dbs_data *dbs_data, int cpu);
bool need_load_eval(struct cpu_dbs_info *cdbs, unsigned int sampling_rate);
bool need_load_eval(struct cpu_common_dbs_info *shared,
unsigned int sampling_rate);
int cpufreq_governor_dbs(struct cpufreq_policy *policy,
struct common_dbs_data *cdata, unsigned int event);
void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy,