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Commit 5b2c9959 authored by Lingutla Chandrasekhar's avatar Lingutla Chandrasekhar Committed by Gerrit - the friendly Code Review server
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sched: energy: rebuild sched_domains with actual capacities 



While sched initialization, sched_domains might have built
with default capacity values, and max_{min_}_cap_org_cpu's
have updated based on them. After energy probe called,
these capacities would change, but max_{min_}cap_org_cpu's
still have old values. And using these staled cpus could give
wrong start_cpu in finding energy efficient cpu.

So rebuild sched_domains, which updates all cpu's group capacities
with actual capacities and then build domains again, and update
max_{min_}cap_org_cpus as well.

Change-Id: I07d58bc849de363c5ed8fb743ab98d3fba727130
Signed-off-by: default avatarLingutla Chandrasekhar <clingutla@codeaurora.org>
parent fc8e63be

kernel/sched/energy.c

+27 −1
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#include <linux/sched_energy.h>

#include <linux/stddef.h>

#include <linux/cpu.h>

#include <linux/cpuset.h>

#include <linux/pm_opp.h>

#include <linux/platform_device.h>
@@ -49,6 +50,17 @@ static void free_resources(void) 
	}

}



static int update_topology;



/*

 * Ideally this should be arch specific implementation,

 * let's define here to help rebuild sched_domain with new capacities.

 */

int arch_update_cpu_topology(void)

{

	return update_topology;

}



void init_sched_energy_costs(void)

{

	struct device_node *cn, *cp;
@@ -273,8 +285,22 @@ static int sched_energy_probe(struct platform_device *pdev) 


	kfree(max_frequencies);



	if (is_sge_valid)

	if (is_sge_valid) {

		/*

		 * Sched_domains might have built with default cpu capacity

		 * values on bootup.

		 *

		 * Let's rebuild them again with actual cpu capacities.

		 * And partition_sched_domain() expects update in cpu topology

		 * to rebuild the domains, so make it satisfied..

		 */

		update_topology = 1;

		rebuild_sched_domains();

		update_topology = 0;



		walt_sched_energy_populated_callback();

	}



	dev_info(&pdev->dev, "Sched-energy-costs capacity updated\n");

	return 0;