[RFC PATCH v4 11/12] OPTIONAL: arch_topology: Start Energy Aware Scheduling

From: Quentin Perret
Date: Thu Jun 28 2018 - 07:42:28 EST


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 when the CPU
capacities have been updated to their final value.

Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Quentin Perret <quentin.perret@xxxxxxx>
---
drivers/base/arch_topology.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index e7cb0c6ade81..2022174f5ac5 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -10,7 +10,9 @@
#include <linux/arch_topology.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
+#include <linux/cpuset.h>
#include <linux/device.h>
+#include <linux/energy_model.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/string.h>
@@ -173,6 +175,9 @@ static cpumask_var_t cpus_to_visit;
static void parsing_done_workfn(struct work_struct *work);
static DECLARE_WORK(parsing_done_work, parsing_done_workfn);

+static void start_eas_workfn(struct work_struct *work);
+static DECLARE_WORK(start_eas_work, start_eas_workfn);
+
static int
init_cpu_capacity_callback(struct notifier_block *nb,
unsigned long val,
@@ -204,6 +209,7 @@ init_cpu_capacity_callback(struct notifier_block *nb,
free_raw_capacity();
pr_debug("cpu_capacity: parsing done\n");
schedule_work(&parsing_done_work);
+ schedule_work(&start_eas_work);
}

return 0;
@@ -249,6 +255,15 @@ static void parsing_done_workfn(struct work_struct *work)
free_cpumask_var(cpus_to_visit);
}

+static void start_eas_workfn(struct work_struct *work)
+{
+ /* Make sure the EM knows about the updated CPU capacities. */
+ em_rescale_cpu_capacity();
+
+ /* Inform the scheduler about the EM availability. */
+ rebuild_sched_domains();
+}
+
#else
core_initcall(free_raw_capacity);
#endif
--
2.17.1