From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16B2AC56202 for ; Mon, 23 Nov 2020 10:36:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C5E3E21741 for ; Mon, 23 Nov 2020 10:36:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="go0zJ4bV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728661AbgKWKfn (ORCPT ); Mon, 23 Nov 2020 05:35:43 -0500 Received: from m42-4.mailgun.net ([69.72.42.4]:20752 "EHLO m42-4.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728181AbgKWKfm (ORCPT ); Mon, 23 Nov 2020 05:35:42 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1606127742; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=eeub++cMqcdEhBNQpbs/Fhuskyys0ddWK0NvSOgUP08=; b=go0zJ4bV8fDInYAiI5Zbtomqbm6Ht9FhXb1InCzOao/QNGnQLqwJu/gQT7Z14WPt/wBEBrF9 MV3ar4mnrCb/wUAZ577WPaD5KTpHuRO8jsMwSQzhg95e3k0f1m8k8s0VvcjRkZ2DcNnwRzpt nk4VLfJhj1Pwap3MJELuZQwRVd4= X-Mailgun-Sending-Ip: 69.72.42.4 X-Mailgun-Sid: WyI0MWYwYSIsICJsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n05.prod.us-east-1.postgun.com with SMTP id 5fbb907e4146c5eefd948e47 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Mon, 23 Nov 2020 10:35:42 GMT Sender: pkondeti=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 8536EC43465; Mon, 23 Nov 2020 10:35:41 +0000 (UTC) Received: from codeaurora.org (unknown [202.46.22.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pkondeti) by smtp.codeaurora.org (Postfix) with ESMTPSA id 6AC27C433ED; Mon, 23 Nov 2020 10:35:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 6AC27C433ED Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=pkondeti@codeaurora.org From: Pavankumar Kondeti To: linux-kernel@vger.kernel.org Cc: Pavankumar Kondeti , Lukasz Luba , "Rafael J. Wysocki" , Quentin Perret , Daniel Lezcano , "Gustavo A. R. Silva" Subject: [PATCH V3] PM / EM: Micro optimization in em_cpu_energy Date: Mon, 23 Nov 2020 16:05:32 +0530 Message-Id: <1606127734-14507-1-git-send-email-pkondeti@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1606127371-13828-1-git-send-email-pkondeti@codeaurora.org> References: <1606127371-13828-1-git-send-email-pkondeti@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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 -- 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.