[PATCH] cpufreq: governor: Always schedule work on the CPU running update

From: Rafael J. Wysocki
Date: Mon Mar 21 2016 - 20:15:38 EST

From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

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@xxxxxxxxx>
drivers/cpufreq/cpufreq_governor.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-pm/drivers/cpufreq/cpufreq_governor.c
--- linux-pm.orig/drivers/cpufreq/cpufreq_governor.c
+++ linux-pm/drivers/cpufreq/cpufreq_governor.c
@@ -245,7 +245,7 @@ static void dbs_irq_work(struct 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,