From: Pavankumar Kondeti <pkondeti@codeaurora.org>
To: linux-kernel@vger.kernel.org
Cc: linux-pm@vger.kernel.org,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Pavankumar Kondeti <pkondeti@codeaurora.org>,
Lukasz Luba <lukasz.luba@arm.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Quentin Perret <qperret@google.com>,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [RESEND PATCH V3] PM / EM: Micro optimization in em_cpu_energy
Date: Sat, 28 Nov 2020 07:09:23 +0530 [thread overview]
Message-ID: <1606527564-27238-1-git-send-email-pkondeti@codeaurora.org> (raw)
In-Reply-To: <671427cc-2abb-68eb-5e54-0851785efa84@intel.com>
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>
---
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
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
next prev parent reply other threads:[~2020-11-28 1:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-23 10:17 [PATCH] PM / EM: Micro optimization in em_pd_energy Pavankumar Kondeti
2020-11-23 10:28 ` Quentin Perret
2020-11-23 10:44 ` Pavan Kondeti
2020-11-23 10:29 ` [PATCH V2] PM / EM: Micro optimization in em_cpu_energy Pavankumar Kondeti
2020-11-23 10:35 ` [PATCH V3] " Pavankumar Kondeti
2020-11-24 14:59 ` Dietmar Eggemann
2020-11-24 17:15 ` [PATCH V2] " Rafael J. Wysocki
2020-11-28 1:39 ` Pavankumar Kondeti [this message]
2020-12-08 17:24 ` [RESEND PATCH V3] " Rafael J. Wysocki
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