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[PATCH v2 03/10] drivers base/arch_topology: frequency-invariant load-tracking support

From Dietmar Eggemann <dietmar.eggemann@arm.com>
Newsgroups linux.kernel
Subject [PATCH v2 03/10] drivers base/arch_topology: frequency-invariant load-tracking support
Date 2017-07-06 12:00 +0200
Message-ID <u0bJM-2Bf-15@gated-at.bofh.it> (permalink)
References <u0bJL-2Bf-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Implements an arch-specific frequency-scaling function
topology_get_freq_scale() which provides the following frequency
scaling factor:

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

One possible consumer of this is the Per-Entity Load Tracking (PELT)
mechanism of the task scheduler.

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  | 20 ++++++++++++++++++++
 include/linux/arch_topology.h |  7 +++++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index f4832c662762..63fb3f945d21 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -22,6 +22,26 @@
 #include <linux/string.h>
 #include <linux/sched/topology.h>
 
+static DEFINE_PER_CPU(unsigned long, freq_scale) = SCHED_CAPACITY_SCALE;
+
+unsigned long topology_get_freq_scale(struct sched_domain *sd, int cpu)
+{
+	return per_cpu(freq_scale, cpu);
+}
+
+void topology_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..168104d2d2cf 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/cpumask.h>
+
 void topology_normalize_cpu_scale(void);
 
 struct device_node;
@@ -14,4 +16,9 @@ unsigned long topology_get_cpu_scale(struct sched_domain *sd, int cpu);
 
 void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity);
 
+unsigned long topology_get_freq_scale(struct sched_domain *sd, int cpu);
+
+void topology_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
+			     unsigned long max_freq);
+
 #endif /* _LINUX_ARCH_TOPOLOGY_H_ */
-- 
2.11.0

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[PATCH v2 00/10] arm, arm64: frequency- and cpu-invariant accounting support for task scheduler Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-06 12:00 +0200
  [PATCH v2 08/10] arm64: wire frequency-invariant accounting support up to the task scheduler Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-06 12:00 +0200
    Re: [PATCH v2 08/10] arm64: wire frequency-invariant accounting  support up to the task scheduler Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-06 12:50 +0200
  [PATCH v2 03/10] drivers base/arch_topology: frequency-invariant load-tracking support Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-06 12:00 +0200
    Re: [PATCH v2 03/10] drivers base/arch_topology: frequency-invariant  load-tracking support Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-06 12:50 +0200
      Re: [PATCH v2 03/10] drivers base/arch_topology: frequency-invariant  load-tracking support Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-07 19:00 +0200
  [PATCH v2 05/10] arm: wire frequency-invariant accounting support up to the task scheduler Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-06 12:00 +0200
    Re: [PATCH v2 05/10] arm: wire frequency-invariant accounting  support up to the task scheduler Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-06 12:50 +0200
  [PATCH v2 02/10] cpufreq: provide data for frequency-invariant load-tracking support Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-06 12:00 +0200
    Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-06 12:50 +0200
      Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant load-tracking support "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-07-07 00:50 +0200
      Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-07 18:10 +0200
        Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support "Rafael J. Wysocki" <rafael@kernel.org> - 2017-07-07 18:20 +0200
          Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-07 19:10 +0200
            Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant load-tracking support "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-07-08 14:20 +0200
              Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-10 09:00 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant load-tracking support "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-07-10 15:00 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-11 08:50 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-11 17:30 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Sudeep Holla <sudeep.holla@arm.com> - 2017-07-13 14:50 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-13 15:10 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Sudeep Holla <sudeep.holla@arm.com> - 2017-07-13 16:10 +0200
              Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Peter Zijlstra <peterz@infradead.org> - 2017-07-10 11:40 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-10 11:50 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-10 12:40 +0200
              Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-10 14:10 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-11 08:10 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-11 17:10 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant load-tracking support "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-07-11 17:10 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-11 17:20 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-12 06:10 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Peter Zijlstra <peterz@infradead.org> - 2017-07-12 10:40 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-12 11:30 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Peter Zijlstra <peterz@infradead.org> - 2017-07-12 13:20 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant load-tracking support "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-07-13 01:30 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Peter Zijlstra <peterz@infradead.org> - 2017-07-13 10:00 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-13 10:50 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Peter Zijlstra <peterz@infradead.org> - 2017-07-13 13:20 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Sudeep Holla <sudeep.holla@arm.com> - 2017-07-13 16:10 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Peter Zijlstra <peterz@infradead.org> - 2017-07-13 16:50 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Sudeep Holla <sudeep.holla@arm.com> - 2017-07-13 17:10 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Sudeep Holla <sudeep.holla@arm.com> - 2017-07-13 15:00 +0200
                Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Sudeep Holla <sudeep.holla@arm.com> - 2017-07-13 14:50 +0200
        Re: [PATCH v2 02/10] cpufreq: provide data for frequency-invariant  load-tracking support Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-10 08:50 +0200
  [PATCH v2 04/10] arm: wire cpufreq input data for frequency-invariant accounting up to the arch Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-06 12:00 +0200
    Re: [PATCH v2 04/10] arm: wire cpufreq input data for  frequency-invariant accounting up to the arch Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-06 12:50 +0200
      Re: [PATCH v2 04/10] arm: wire cpufreq input data for  frequency-invariant accounting up to the arch Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-10 17:20 +0200
        Re: [PATCH v2 04/10] arm: wire cpufreq input data for  frequency-invariant accounting up to the arch Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-11 08:40 +0200
  [PATCH v2 09/10] arm64: wire cpu-invariant accounting support up to the task scheduler Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-06 12:00 +0200
    Re: [PATCH v2 09/10] arm64: wire cpu-invariant accounting support up  to the task scheduler Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-06 12:50 +0200
  [PATCH v2 06/10] arm: wire cpu-invariant accounting support up to the task scheduler Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-06 12:00 +0200
    Re: [PATCH v2 06/10] arm: wire cpu-invariant accounting support up  to the task scheduler Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-06 12:50 +0200
  [PATCH v2 01/10] drivers base/arch_topology: free cpumask cpus_to_visit Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-06 12:00 +0200
    Re: [PATCH v2 01/10] drivers base/arch_topology: free cpumask  cpus_to_visit Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-06 12:30 +0200
      Re: [PATCH v2 01/10] drivers base/arch_topology: free cpumask  cpus_to_visit Juri Lelli <juri.lelli@arm.com> - 2017-07-06 13:00 +0200
        Re: [PATCH v2 01/10] drivers base/arch_topology: free cpumask  cpus_to_visit Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-06 13:20 +0200
          Re: [PATCH v2 01/10] drivers base/arch_topology: free cpumask  cpus_to_visit Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-07 18:00 +0200
  [PATCH v2 10/10] drivers base/arch_topology: inline cpu- and frequency-invariant accounting Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-06 12:00 +0200
    Re: [PATCH v2 10/10] drivers base/arch_topology: inline cpu- and  frequency-invariant accounting Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-06 13:00 +0200
      Re: [PATCH v2 10/10] drivers base/arch_topology: inline cpu- and  frequency-invariant accounting Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-10 17:20 +0200

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