From patchwork Sat Nov 4 10:59:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincent Guittot X-Patchwork-Id: 13445468 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE15CC0018A for ; Sat, 4 Nov 2023 10:59:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231970AbjKDK7X (ORCPT ); Sat, 4 Nov 2023 06:59:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231998AbjKDK7V (ORCPT ); Sat, 4 Nov 2023 06:59:21 -0400 Received: from mail-wm1-x333.google.com (mail-wm1-x333.google.com [IPv6:2a00:1450:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0F85ED47 for ; Sat, 4 Nov 2023 03:59:18 -0700 (PDT) Received: by mail-wm1-x333.google.com with SMTP id 5b1f17b1804b1-40836ea8cbaso20963675e9.0 for ; Sat, 04 Nov 2023 03:59:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1699095556; x=1699700356; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=l8u+U/9u4ohr5MnGNG/ipD+T+tLh/PNcKnY6Yu8ixWw=; b=vU3YRG/y1EFkg/c24C+73H0U0uDXnUJmgDFM8DAJj2XemHxuh5ExcFMi1rOhf5lyDb OfbDNiNROLZnYOBvRtqkHQeDokNPyDzT4MEJn5/UzqSjQvdd8nAl0ZyJJyFpGrny9Chb ujo+4JtjVlYJDJ9BqKY9rMEKPvhBP1s1+8fQVR2xZmGp/dnF4aIdEVcXSWay5guP9Rk8 i6VZQqIKfo2EtS+My3f/rHLrLPMitZIqC/uV7mORn2jrZntYqV86xruhpp7vbALyoJp+ O8xIGVVCcTCDgm4z4Uccc91YFUQhtVSeBcoPGH1kePB+xk/bj6fkInpor0YWIrtDVgk/ iiHA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699095556; x=1699700356; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=l8u+U/9u4ohr5MnGNG/ipD+T+tLh/PNcKnY6Yu8ixWw=; b=FGsuBaI3os5/06LtnSS+7pMMuRR0eA7o9D4FRPq7AAYlZ8iTRvTjBRof0U8U/RYcJS Jt3XUV9ZPW42/ZcTqR7fpsmRQ91ufefzSPOU5Ie8893aIUZ3w4ISn0+1lgmM6hf8Tgb9 mbGjuHH92LdX8LfEkm8u1U/4jaZTQ7WZyXsrSvvvqrumMqZqMpIfQLRBvT58Bj75Mj/f S6wvWoE4BP5SwDkwZrPq42RS0d/mMEy/U1+URkiJrFBHSsZHMm8JH0vwnEsjxeOTTpqu ZRZkt10au158KIWcWg1FIIzLvzlwqmC8OyyEGSwGk/NMfGsnb3JMnY5tU7X44ZpQ5wxQ JSOQ== X-Gm-Message-State: AOJu0YxumyVdQkjohu+fTWfS+B+KHz9z8bpSaIbe8KsDDSgEmkcqocAu 25fZ1zHygOX/w99r9g4sSyRn9g== X-Google-Smtp-Source: AGHT+IEgFd8wiaeekgZUTxuh/vIlcgbfrV0M4wBl+RauyhFwAF2dZX/wW+3/dVZ2wNb5vfBPQCe4tw== X-Received: by 2002:a05:600c:470e:b0:408:4f50:9602 with SMTP id v14-20020a05600c470e00b004084f509602mr20968669wmo.12.1699095556439; Sat, 04 Nov 2023 03:59:16 -0700 (PDT) Received: from vingu-book.. ([2a01:e0a:f:6020:3172:eb13:5bac:126a]) by smtp.gmail.com with ESMTPSA id p6-20020a05600c358600b004053a6b8c41sm5315809wmq.12.2023.11.04.03.59.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 04 Nov 2023 03:59:15 -0700 (PDT) From: Vincent Guittot To: linux@armlinux.org.uk, catalin.marinas@arm.com, will@kernel.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, sudeep.holla@arm.com, gregkh@linuxfoundation.org, rafael@kernel.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, viresh.kumar@linaro.org, lenb@kernel.org, robert.moore@intel.com, lukasz.luba@arm.com, ionela.voinescu@arm.com, pierre.gondois@arm.com, beata.michalska@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org Cc: conor.dooley@microchip.com, suagrfillet@gmail.com, ajones@ventanamicro.com, lftan@kernel.org, Vincent Guittot Subject: [PATCH v5 3/7] cpufreq/schedutil: Use a fixed reference frequency Date: Sat, 4 Nov 2023 11:59:03 +0100 Message-Id: <20231104105907.1365392-4-vincent.guittot@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231104105907.1365392-1-vincent.guittot@linaro.org> References: <20231104105907.1365392-1-vincent.guittot@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org cpuinfo.max_freq can change at runtime because of boost as an example. This implies that the value could be different than the one that has been used when computing the capacity of a CPU. The new arch_scale_freq_ref() returns a fixed and coherent reference frequency that can be used when computing a frequency based on utilization. Use this arch_scale_freq_ref() when available and fallback to policy otherwise. Signed-off-by: Vincent Guittot Reviewed-by: Lukasz Luba Tested-by: Lukasz Luba Acked-by: Rafael J. Wysocki Reviewed-by: Dietmar Eggemann --- kernel/sched/cpufreq_schedutil.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index 458d359f5991..f3a87fa16332 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -114,6 +114,28 @@ static void sugov_deferred_update(struct sugov_policy *sg_policy) } } +/** + * get_capacity_ref_freq - get the reference frequency that has been used to + * correlate frequency and compute capacity for a given cpufreq policy. We use + * the CPU managing it for the arch_scale_freq_ref() call in the function. + * @policy: the cpufreq policy of the CPU in question. + * + * Return: the reference CPU frequency to compute a capacity. + */ +static __always_inline +unsigned long get_capacity_ref_freq(struct cpufreq_policy *policy) +{ + unsigned int freq = arch_scale_freq_ref(policy->cpu); + + if (freq) + return freq; + + if (arch_scale_freq_invariant()) + return policy->cpuinfo.max_freq; + + return policy->cur; +} + /** * get_next_freq - Compute a new frequency for a given cpufreq policy. * @sg_policy: schedutil policy object to compute the new frequency for. @@ -140,10 +162,10 @@ static unsigned int get_next_freq(struct sugov_policy *sg_policy, unsigned long util, unsigned long max) { struct cpufreq_policy *policy = sg_policy->policy; - unsigned int freq = arch_scale_freq_invariant() ? - policy->cpuinfo.max_freq : policy->cur; + unsigned int freq; util = map_util_perf(util); + freq = get_capacity_ref_freq(policy); freq = map_util_freq(util, freq, max); if (freq == sg_policy->cached_raw_freq && !sg_policy->need_freq_update)