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Commit 490a3d4b authored by Abhijeet Dharmapurikar's avatar Abhijeet Dharmapurikar
Browse files

sched: track mid capacity cpu 



Tracking the mid capacity cpu will help optimize the placement algorithm
in upcoming patches.

Change-Id: I49f6719a216ddb578375fde4770be0bbc6cc552a
Signed-off-by: default avatarAbhijeet Dharmapurikar <adharmap@codeaurora.org>
parent b98e655c

kernel/sched/sched.h

+2 −0
Original line number Diff line number Diff line
@@ -731,6 +731,8 @@ struct root_domain { 


	/* First cpu with maximum and minimum original capacity */

	int max_cap_orig_cpu, min_cap_orig_cpu;

	/* First cpu with mid capacity */

	int mid_cap_orig_cpu;

};



extern struct root_domain def_root_domain;

kernel/sched/topology.c

+15 −0
Original line number Diff line number Diff line
@@ -303,6 +303,7 @@ static int init_rootdomain(struct root_domain *rd) 
		goto free_cpudl;



	rd->max_cap_orig_cpu = rd->min_cap_orig_cpu = -1;

	rd->mid_cap_orig_cpu = -1;



	return 0;
@@ -1851,6 +1852,20 @@ build_sched_domains(const struct cpumask *cpu_map, struct sched_domain_attr *att 


		cpu_attach_domain(sd, d.rd, i);

	}



	/* set the mid capacity cpu (assumes only 3 capacities) */

	for_each_cpu(i, cpu_map) {

		int max_cpu = READ_ONCE(d.rd->max_cap_orig_cpu);

		int min_cpu = READ_ONCE(d.rd->min_cap_orig_cpu);



		if ((cpu_rq(i)->cpu_capacity_orig

				!=  cpu_rq(min_cpu)->cpu_capacity_orig) &&

			(cpu_rq(i)->cpu_capacity_orig

				!=  cpu_rq(max_cpu)->cpu_capacity_orig)) {

			WRITE_ONCE(d.rd->mid_cap_orig_cpu, i);

			break;

		}

	}

	rcu_read_unlock();



	if (rq && sched_debug_enabled) {