Commit aa11a7eb authored by Lukasz Luba's avatar Lukasz Luba Committed by Rafael J. Wysocki
Browse files

PM: EM: Use runtime modified EM for CPUs energy estimation in EAS 



The new Energy Model (EM) supports runtime modification of the performance
state table to better model the power used by the SoC. Use this new
feature to improve energy estimation and therefore task placement in
Energy Aware Scheduler (EAS).

Reviewed-by: default avatarDietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: default avatarDietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: default avatarLukasz Luba <lukasz.luba@arm.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent ca0fc871

include/linux/energy_model.h

+9 −3
Original line number Diff line number Diff line
@@ -239,9 +239,14 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd, 
				unsigned long allowed_cpu_cap)

{

	unsigned long freq, ref_freq, scale_cpu;

	struct em_perf_table *em_table;

	struct em_perf_state *ps;

	int cpu, i;



#ifdef CONFIG_SCHED_DEBUG

	WARN_ONCE(!rcu_read_lock_held(), "EM: rcu read lock needed\n");

#endif



	if (!sum_util)

		return 0;
@@ -264,9 +269,10 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd, 
	 * Find the lowest performance state of the Energy Model above the

	 * requested frequency.

	 */

	i = em_pd_get_efficient_state(pd->table, pd->nr_perf_states, freq,

				      pd->flags);

	ps = &pd->table[i];

	em_table = rcu_dereference(pd->em_table);

	i = em_pd_get_efficient_state(em_table->state, pd->nr_perf_states,

				      freq, pd->flags);

	ps = &em_table->state[i];



	/*

	 * The capacity of a CPU in the domain at the performance state (ps)