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UPSTREAM: PM / EM: Micro optimization in em_cpu_energy

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When the sum of the utilization of CPUs in a power domain is zero,
return the energy as 0 without doing any computations.

Acked-by: Quentin Perret <qperret@google.com>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

(cherry picked from commit 9cc7e96aa846f9086431d6c2d33ff9ab42d72b2d)
Bug: 173981595
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Change-Id: I9b1a83d210c30a8a86da26f94ac0c2f855d2ed10
This commit is contained in:
Pavankumar Kondeti
2020-11-28 07:09:23 +05:30
committed by Todd Kjos
parent f2684370d3
commit 5ed9ed0164
1 changed files with 3 additions and 0 deletions
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3
include/linux/energy_model.h
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@@ -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