From patchwork Mon Dec 11 10:48:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincent Guittot X-Patchwork-Id: 13487033 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="caxgzVPW" Received: from mail-wr1-x429.google.com (mail-wr1-x429.google.com [IPv6:2a00:1450:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8BDD8EB for ; Mon, 11 Dec 2023 02:49:07 -0800 (PST) Received: by mail-wr1-x429.google.com with SMTP id ffacd0b85a97d-336121f93e3so980262f8f.0 for ; Mon, 11 Dec 2023 02:49:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1702291746; x=1702896546; 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=19YdKXep2h2XKs9tI+n1uE2b2ri9zL5T7djiTxR5FZs=; b=caxgzVPWvGkUC4/QPdofkQlRsb5EcFWebyQalIeP2tPQI7TEDFpFgOIFHE2bL4QdGk w/q+KH3lrWW0RdMxQ4eQ79Wh8VrIWWLOiHm+KLYn/zMNNBmbrMMrhH3Z3CZyEAPUhOtm H80WTj4mj3crsdN807njsgqWOP2i5e1z33UXPOZ9by2x6/AnLvo3CFoHDg4MjKXWkG5U xuqH5LZ5+5r8J9p058PxhoKi+dMN1BgaMgdkTfgFx9s0/Sxn3sqwN+/I11je7OIMnMq8 GPsbWD1zX42XvWVsYFnvLwLhivPAPt2GzNBB3DQw1arXlSUp2OmXtsLWSoNsI6lSy0cO KyLg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702291746; x=1702896546; 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=19YdKXep2h2XKs9tI+n1uE2b2ri9zL5T7djiTxR5FZs=; b=gTkPhh6sYuHVeKGYHI2C49JTg9+41l7TS/2EOcQ7awIy1p/Ymhw+uuhKp5tAWEgewq 5fijyD4bKEfQVjjKLLgC3lTsCY9qPRm8ricvMu9R3nFB8gUNfV7APnAW3xz/mnlHH6el L7RqUQvAUEWAxllZaLP0zRv9Fc9LODhSv/oVFJ/n6G4Mi1U31kpIaG/CRhjrrPsOeJ1M y4zjPv5hXUJ/0jbLLPAqZ3RCpP7lSH/gipTd8qsKbMLL2u71E8aPEKRMut5TRa22l7dI IbHK1Jy83zmMHaBrslP7iE5rFT33cOaJjoFoiE2roAo3gaRsCfZwTwoMHgaH3ohLZZwG jXVQ== X-Gm-Message-State: AOJu0Yxi5zwK5Qvlnb5d0+TGpaTThyzC4X+Rx/AZ/vppOHX8f8bAqSqi DXB+R+pvcV2BhbW0M8wTKqXFHg== X-Google-Smtp-Source: AGHT+IE6XqYGAPzyGfJojSMGYv4TCKNLa8KTkknwn96//z5+sFb+KJ1vbQvECdNkL4zdYu7uN7TYyg== X-Received: by 2002:adf:f3cf:0:b0:333:3d26:7b01 with SMTP id g15-20020adff3cf000000b003333d267b01mr3106219wrp.13.1702291745981; Mon, 11 Dec 2023 02:49:05 -0800 (PST) Received: from vingu-book.. ([2a01:e0a:f:6020:a8d:abc:f0ae:3066]) by smtp.gmail.com with ESMTPSA id e16-20020adffd10000000b003346db01263sm8232579wrr.104.2023.12.11.02.49.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Dec 2023 02:49:05 -0800 (PST) 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, 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, beata.michalska@arm.com, Vincent Guittot Subject: [PATCH v7 4/7] energy_model: Use a fixed reference frequency Date: Mon, 11 Dec 2023 11:48:52 +0100 Message-Id: <20231211104855.558096-5-vincent.guittot@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231211104855.558096-1-vincent.guittot@linaro.org> References: <20231211104855.558096-1-vincent.guittot@linaro.org> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The last item of a performance domain is not always the performance point that has been used to compute CPU's capacity. This can lead to different target frequency compared with other part of the system like schedutil and would result in wrong energy estimation. A new arch_scale_freq_ref() is available to return a fixed and coherent frequency reference that can be used when computing the CPU's frequency for an level of utilization. Use this function to get this reference frequency. Energy model is never used without defining arch_scale_freq_ref() but can be compiled. Define a default arch_scale_freq_ref() returning 0 in such case. Signed-off-by: Vincent Guittot Reviewed-by: Lukasz Luba Tested-by: Lukasz Luba --- include/linux/energy_model.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h index adec808b371a..88d91e087471 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -224,7 +224,7 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd, unsigned long max_util, unsigned long sum_util, unsigned long allowed_cpu_cap) { - unsigned long freq, scale_cpu; + unsigned long freq, ref_freq, scale_cpu; struct em_perf_state *ps; int cpu; @@ -241,10 +241,10 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd, */ cpu = cpumask_first(to_cpumask(pd->cpus)); scale_cpu = arch_scale_cpu_capacity(cpu); - ps = &pd->table[pd->nr_perf_states - 1]; + ref_freq = arch_scale_freq_ref(cpu); max_util = min(max_util, allowed_cpu_cap); - freq = map_util_freq(max_util, ps->frequency, scale_cpu); + freq = map_util_freq(max_util, ref_freq, scale_cpu); /* * Find the lowest performance state of the Energy Model above the