| Message ID | 20170706094948.8779-4-dietmar.eggemann@arm.com |
|---|---|
| State | New |
| Headers | show |
| Series | arm, arm64: frequency- and cpu-invariant accounting support for task scheduler | expand |
On 06-07-17, 10:49, Dietmar Eggemann wrote: > 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> > + You don't need a full include here, instead following will work pretty well. struct cpumask; > 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_ */ Apart from that: Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> -- viresh
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_ */
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(+) -- 2.11.0