cpufreq: governor: Always schedule work on the CPU running update

Modify dbs_irq_work() to always schedule the process-context work
on the current CPU which also ran the dbs_update_util_handler()
that the irq_work being handled came from.

This causes the entire frequency update handling (involving the
"ondemand" or "conservative" governors) to be carried out by the
CPU whose frequency is to be updated and reduces the overall amount
of inter-CPU noise related to cpufreq.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index 1c25ef4056164b2cb7ddc587441637a1973612c1..10a5cfeae8c5e34317805402c63d0c11e3aaac5e 100644 (file)
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -329,7 +329,7 @@ static void dbs_irq_work(struct irq_work *irq_work)
        struct policy_dbs_info *policy_dbs;
 
        policy_dbs = container_of(irq_work, struct policy_dbs_info, irq_work);
-       schedule_work(&policy_dbs->work);
+       schedule_work_on(smp_processor_id(), &policy_dbs->work);
 }
 
 static void dbs_update_util_handler(struct update_util_data *data, u64 time,