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cpufreq: use system_wq instead of dedicated workqueues 

With cmwq, there's no reason for cpufreq drivers to use separate
workqueues.  Remove the dedicated workqueues from cpufreq_conservative
and cpufreq_ondemand and use system_wq instead.  The work items are
already sync canceled on stop, so it's already guaranteed that no work
is running on module exit.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Dave Jones <davej@redhat.com>
Cc: cpufreq@vger.kernel.org
This commit is contained in:
Tejun Heo 2011-01-26 12:12:50 +01:00
parent bcb6d9161d
commit 57df5573a5
2 changed files with 6 additions and 36 deletions
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22
drivers/cpufreq/cpufreq_conservative.c
View File

@ -81,8 +81,6 @@ static unsigned int dbs_enable; /* number of CPUs using this policy */
*/
static DEFINE_MUTEX(dbs_mutex);
static struct workqueue_struct *kconservative_wq;
static struct dbs_tuners {
unsigned int sampling_rate;
unsigned int sampling_down_factor;
@ -560,7 +558,7 @@ static void do_dbs_timer(struct work_struct *work)
dbs_check_cpu(dbs_info);
queue_delayed_work_on(cpu, kconservative_wq, &dbs_info->work, delay);
schedule_delayed_work_on(cpu, &dbs_info->work, delay);
mutex_unlock(&dbs_info->timer_mutex);
}
@ -572,8 +570,7 @@ static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
dbs_info->enable = 1;
INIT_DELAYED_WORK_DEFERRABLE(&dbs_info->work, do_dbs_timer);
queue_delayed_work_on(dbs_info->cpu, kconservative_wq, &dbs_info->work,
delay);
schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, delay);
}
static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
@ -716,25 +713,12 @@ struct cpufreq_governor cpufreq_gov_conservative = {
static int __init cpufreq_gov_dbs_init(void)
{
int err;
kconservative_wq = create_workqueue("kconservative");
if (!kconservative_wq) {
printk(KERN_ERR "Creation of kconservative failed\n");
return -EFAULT;
}
err = cpufreq_register_governor(&cpufreq_gov_conservative);
if (err)
destroy_workqueue(kconservative_wq);
return err;
return cpufreq_register_governor(&cpufreq_gov_conservative);
}
static void __exit cpufreq_gov_dbs_exit(void)
{
cpufreq_unregister_governor(&cpufreq_gov_conservative);
destroy_workqueue(kconservative_wq);
}

20
drivers/cpufreq/cpufreq_ondemand.c
View File

@ -104,8 +104,6 @@ static unsigned int dbs_enable; /* number of CPUs using this policy */
*/
static DEFINE_MUTEX(dbs_mutex);
static struct workqueue_struct *kondemand_wq;
static struct dbs_tuners {
unsigned int sampling_rate;
unsigned int up_threshold;
@ -667,7 +665,7 @@ static void do_dbs_timer(struct work_struct *work)
__cpufreq_driver_target(dbs_info->cur_policy,
dbs_info->freq_lo, CPUFREQ_RELATION_H);
}
queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay);
schedule_delayed_work_on(cpu, &dbs_info->work, delay);
mutex_unlock(&dbs_info->timer_mutex);
}
@ -681,8 +679,7 @@ static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
dbs_info->sample_type = DBS_NORMAL_SAMPLE;
INIT_DELAYED_WORK_DEFERRABLE(&dbs_info->work, do_dbs_timer);
queue_delayed_work_on(dbs_info->cpu, kondemand_wq, &dbs_info->work,
delay);
schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, delay);
}
static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
@ -814,7 +811,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
static int __init cpufreq_gov_dbs_init(void)
{
int err;
cputime64_t wall;
u64 idle_time;
int cpu = get_cpu();
@ -838,22 +834,12 @@ static int __init cpufreq_gov_dbs_init(void)
MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10);
}
kondemand_wq = create_workqueue("kondemand");
if (!kondemand_wq) {
printk(KERN_ERR "Creation of kondemand failed\n");
return -EFAULT;
}
err = cpufreq_register_governor(&cpufreq_gov_ondemand);
if (err)
destroy_workqueue(kondemand_wq);
return err;
return cpufreq_register_governor(&cpufreq_gov_ondemand);
}
static void __exit cpufreq_gov_dbs_exit(void)
{
cpufreq_unregister_governor(&cpufreq_gov_ondemand);
destroy_workqueue(kondemand_wq);
}