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SubjectRe: [PATCH V3] PM / EM: Micro optimization in em_cpu_energy
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On 23/11/2020 11:35, Pavankumar Kondeti wrote:
> When the sum of the utilization of CPUs in a performance domain is
> zero, return the energy as 0 without doing any computations.
>
> Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
> ---
> V3: %s/power/performance as corrected by Quentin
> V2: Fixed the function name in the commit message.
>
> include/linux/energy_model.h | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h
> index b67a51c..8810f1f 100644
> --- a/include/linux/energy_model.h
> +++ b/include/linux/energy_model.h
> @@ -103,6 +103,9 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd,
> struct em_perf_state *ps;
> int i, cpu;
>
> + if (!sum_util)
> + return 0;
> +
> /*
> * In order to predict the performance state, map the utilization of
> * the most utilized CPU of the performance domain to a requested


LGTM.

Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>

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