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Subject[PATCH v3 05/10] drivers base/arch_topology: provide frequency-invariant accounting support
Date
Implements the arch-specific (arm and arm64) frequency-invariance setter
function arch_set_freq_scale() which provides the following frequency
scaling factor:

current_freq(cpu) << SCHED_CAPACITY_SHIFT / max_supported_freq(cpu)

One possible consumer of the frequency-invariance getter function
topology_get_freq_scale() is the Per-Entity Load Tracking (PELT)
mechanism of the task scheduler.

Allow inlining of topology_get_freq_scale() into the task scheduler
fast path (e.g. __update_load_avg_se()) by coding it as a static inline
function in the arch topology header file.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Juri Lelli <juri.lelli@arm.com>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
---
drivers/base/arch_topology.c | 14 ++++++++++++++
include/linux/arch_topology.h | 10 ++++++++++
2 files changed, 24 insertions(+)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 562e0c93ae52..af9ab98a233e 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -22,6 +22,20 @@
#include <linux/string.h>
#include <linux/sched/topology.h>

+DEFINE_PER_CPU(unsigned long, freq_scale) = SCHED_CAPACITY_SCALE;
+
+void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
+ unsigned long max_freq)
+{
+ unsigned long scale;
+ int i;
+
+ scale = (cur_freq << SCHED_CAPACITY_SHIFT) / max_freq;
+
+ for_each_cpu(i, cpus)
+ per_cpu(freq_scale, i) = scale;
+}
+
static DEFINE_MUTEX(cpu_scale_mutex);
static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;

diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h
index 9af3c174c03a..3e3c2657c9a1 100644
--- a/include/linux/arch_topology.h
+++ b/include/linux/arch_topology.h
@@ -4,6 +4,8 @@
#ifndef _LINUX_ARCH_TOPOLOGY_H_
#define _LINUX_ARCH_TOPOLOGY_H_

+#include <linux/percpu.h>
+
void topology_normalize_cpu_scale(void);

struct device_node;
@@ -14,4 +16,12 @@ unsigned long topology_get_cpu_scale(struct sched_domain *sd, int cpu);

void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity);

+DECLARE_PER_CPU(unsigned long, freq_scale);
+
+static inline
+unsigned long topology_get_freq_scale(struct sched_domain *sd, int cpu)
+{
+ return per_cpu(freq_scale, cpu);
+}
+
#endif /* _LINUX_ARCH_TOPOLOGY_H_ */
--
2.11.0
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