linux-kernel - [PATCH v5 13/14] OPTIONAL: arch_topology: Start Energy Aware Scheduling

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Message-Id: <20180724122521.22109-14-quentin.perret@arm.com>
Date:   Tue, 24 Jul 2018 13:25:20 +0100
From:   Quentin Perret <quentin.perret@....com>
To:     peterz@...radead.org, rjw@...ysocki.net,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, mingo@...hat.com,
        dietmar.eggemann@....com, morten.rasmussen@....com,
        chris.redpath@....com, patrick.bellasi@....com,
        valentin.schneider@....com, vincent.guittot@...aro.org,
        thara.gopinath@...aro.org, viresh.kumar@...aro.org,
        tkjos@...gle.com, joel@...lfernandes.org, smuckle@...gle.com,
        adharmap@...cinc.com, skannan@...cinc.com, pkondeti@...eaurora.org,
        juri.lelli@...hat.com, edubezval@...il.com,
        srinivas.pandruvada@...ux.intel.com, currojerez@...eup.net,
        javi.merino@...nel.org, quentin.perret@....com
Subject: [PATCH v5 13/14] OPTIONAL: arch_topology: Start Energy Aware Scheduling

Energy Aware Scheduling (EAS) starts when the scheduling domains are
built if the Energy Model (EM) is present. However, in the typical case
of Arm/Arm64 systems, the EM is provided after the scheduling domains
are first built at boot time, which results in EAS staying disabled.

Fix this issue by re-building the scheduling domain from the arch
topology driver, once CPUfreq is up and running and the asymmetry in CPU
capacities has been detected.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Quentin Perret <quentin.perret@....com>
---
 drivers/base/arch_topology.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index e7cb0c6ade81..5b9f107f2e4a 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -10,6 +10,7 @@
 #include <linux/arch_topology.h>
 #include <linux/cpu.h>
 #include <linux/cpufreq.h>
+#include <linux/cpuset.h>
 #include <linux/device.h>
 #include <linux/of.h>
 #include <linux/slab.h>
@@ -247,6 +248,7 @@ static void parsing_done_workfn(struct work_struct *work)
 	cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
 					 CPUFREQ_POLICY_NOTIFIER);
 	free_cpumask_var(cpus_to_visit);
+	rebuild_sched_domains();
 }
 
 #else
-- 
2.18.0