diff options
| author | Valentin Schneider <valentin.schneider@arm.com> | 2020-07-31 20:20:14 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-08-01 09:19:43 +0200 |
| commit | f4470cdf108f00533e8079b19434e6cb48c17fa3 (patch) | |
| tree | 3c290a2f505a3d6a3fc443cd8f12048c43695f96 | |
| parent | fcd7c9c3c35aed58aba2eea6d375f0e5b03bd6d6 (diff) | |
sched: Document arch_scale_*_capacity()
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
| -rw-r--r-- | include/linux/sched/topology.h | 10 | ||||
| -rw-r--r-- | kernel/sched/sched.h | 10 |
2 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h index 764222d637b7..820511289857 100644 --- a/include/linux/sched/topology.h +++ b/include/linux/sched/topology.h @@ -217,6 +217,16 @@ static inline bool cpus_share_cache(int this_cpu, int that_cpu) #endif /* !CONFIG_SMP */ #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 unsigned long arch_scale_cpu_capacity(int cpu) { diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 296efd30d8c9..3fd283892761 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2049,6 +2049,16 @@ void arch_scale_freq_tick(void) #endif #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 unsigned long arch_scale_freq_capacity(int cpu) { |