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sched: Document arch_scale_*_capacity()

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Rather that hide their purpose in some dark, damp corner of Documentation/,
add some documentation to the default implementations.

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200731192016.7484-2-valentin.schneider@arm.com
This commit is contained in:
Valentin Schneider 2020-07-31 20:20:14 +01:00 committed by Ingo Molnar
parent fcd7c9c3c3
commit f4470cdf10
2 changed files with 20 additions and 0 deletions
include/linux/sched
topology.h
kernel/sched
sched.h

10
include/linux/sched/topology.h
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@ -217,6 +217,16 @@ static inline bool cpus_share_cache(int this_cpu, int that_cpu)
#endif /* !CONFIG_SMP */ #endif /* !CONFIG_SMP */
#ifndef arch_scale_cpu_capacity #ifndef arch_scale_cpu_capacity
/**
* arch_scale_cpu_capacity - get the capacity scale factor of a given CPU.
* @cpu: the CPU in question.
*
* Return: the CPU scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
*
* max_perf(cpu)
* ----------------------------- * SCHED_CAPACITY_SCALE
* max(max_perf(c) : c \in CPUs)
*/
static __always_inline static __always_inline
unsigned long arch_scale_cpu_capacity(int cpu) unsigned long arch_scale_cpu_capacity(int cpu)
{ {

10
kernel/sched/sched.h
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@ -2049,6 +2049,16 @@ void arch_scale_freq_tick(void)
#endif #endif
#ifndef arch_scale_freq_capacity #ifndef arch_scale_freq_capacity
/**
* arch_scale_freq_capacity - get the frequency scale factor of a given CPU.
* @cpu: the CPU in question.
*
* Return: the frequency scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
*
* f_curr
* ------ * SCHED_CAPACITY_SCALE
* f_max
*/
static __always_inline static __always_inline
unsigned long arch_scale_freq_capacity(int cpu) unsigned long arch_scale_freq_capacity(int cpu)
{ {