b732dd602c
Maximum Frequency Invariance has to be part of Cpu Invariance because
Frequency Invariance deals only with differences in load-tracking
introduces by Dynamic Frequency Scaling and not with limiting the
possible range of cpu frequency.
By placing Maximum Frequency Invariance into Cpu Invariance,
load-tracking is scaled via arch_scale_cpu_capacity()
in __update_load_avg() and cpu capacity is scaled via
arch_scale_cpu_capacity() in update_cpu_capacity().
To be able to save the extra multiplication in the scheduler hotpath
(__update_load_avg()) we could:
1 Inform cpufreq about base cpu capacity at boot and let it handle
scale_cpu_capacity() as well.
2 Use the cpufreq policy callback which would update a per-cpu current
cpu_scale and this value would be return in scale_cpu_capacity().
3 Use per-cpu current max_freq_scale and current cpu_scale with the
current patch.
Including <linux/cpufreq.h> in topology.h like for the arm arch doesn't
work because of CONFIG_COMPAT=y (Kernel support for 32-bit EL0).
That's why cpufreq_scale_max_freq_capacity() has to be declared extern
in topology.h.
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
#ifndef __ASM_TOPOLOGY_H
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#define __ASM_TOPOLOGY_H
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#include <linux/cpumask.h>
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struct cpu_topology {
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int thread_id;
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int core_id;
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int cluster_id;
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cpumask_t thread_sibling;
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cpumask_t core_sibling;
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};
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extern struct cpu_topology cpu_topology[NR_CPUS];
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#define topology_physical_package_id(cpu) (cpu_topology[cpu].cluster_id)
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#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
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#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
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#define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)
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void init_cpu_topology(void);
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void store_cpu_topology(unsigned int cpuid);
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const struct cpumask *cpu_coregroup_mask(int cpu);
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struct sched_domain;
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#ifdef CONFIG_CPU_FREQ
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#define arch_scale_freq_capacity cpufreq_scale_freq_capacity
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extern unsigned long cpufreq_scale_freq_capacity(struct sched_domain *sd, int cpu);
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extern unsigned long cpufreq_scale_max_freq_capacity(int cpu);
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#endif
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#define arch_scale_cpu_capacity scale_cpu_capacity
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extern unsigned long scale_cpu_capacity(struct sched_domain *sd, int cpu);
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#include <asm-generic/topology.h>
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#endif /* _ASM_ARM_TOPOLOGY_H */
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