Commit 1ce28d6b authored by Alexey Starikovskiy's avatar Alexey Starikovskiy Committed by Dave Jones
Browse files

[CPUFREQ][1/2] ondemand: updated tune for hardware coordination 



Try to make dbs_check_cpu() call on all CPUs at the same jiffy.
This will help when multiple cores share P-states via Hardware Coordination.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi at intel.com>
Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy at intel.com>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent cd878479

drivers/cpufreq/cpufreq_ondemand.c

+8 −5
Original line number Diff line number Diff line
@@ -305,6 +305,9 @@ static void do_dbs_timer(void *data) 
{

	unsigned int cpu = smp_processor_id();

	struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu);

	/* We want all CPUs to do sampling nearly on same jiffy */

	int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);

	delay -= jiffies % delay;



	if (!dbs_info->enable)

		return;
@@ -312,18 +315,18 @@ static void do_dbs_timer(void *data) 
	lock_cpu_hotplug();

	dbs_check_cpu(dbs_info);

	unlock_cpu_hotplug();

	queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work,

			usecs_to_jiffies(dbs_tuners_ins.sampling_rate));

	queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay);

}



static inline void dbs_timer_init(unsigned int cpu)

{

	struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu);

	/* We want all CPUs to do sampling nearly on same jiffy */

	int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);

	delay -= jiffies % delay;



	INIT_WORK(&dbs_info->work, do_dbs_timer, 0);

	queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work,

			usecs_to_jiffies(dbs_tuners_ins.sampling_rate));

	return;

	queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay);

}



static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)

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