From nobody Tue Dec 16 05:41:16 2025 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 ADC61C4167B for ; Thu, 9 Nov 2023 10:15:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233954AbjKIKPO (ORCPT ); Thu, 9 Nov 2023 05:15:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233420AbjKIKPI (ORCPT ); Thu, 9 Nov 2023 05:15:08 -0500 Received: from mail-wm1-x32b.google.com (mail-wm1-x32b.google.com [IPv6:2a00:1450:4864:20::32b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 84BB130C5 for ; Thu, 9 Nov 2023 02:14:55 -0800 (PST) Received: by mail-wm1-x32b.google.com with SMTP id 5b1f17b1804b1-4083f613275so4555865e9.2 for ; Thu, 09 Nov 2023 02:14:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1699524894; x=1700129694; 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=aduCSyHEYIhu+IO52anhhUtjmJcDS68d0TTkBLTxAgE=; b=B2XoNOc/UvEkRo9hxP5p1Y+/rylqTlP3mpJpsnqcRVhqXeUBHOrpDAr/QbiG4v0gac KbITUVpfPRbT7B2PCPJpKJ44jFCcIwxQr6IiwXs2MLAScSMyildYvBopvyezCP1E0q9m BGDj7nYrYa+dWF7na8dtTgGOBic5lJpmdxpY2oDmjYv7l7W4GYLUMZ0nd6mqII+t7GZi yIzwyAnQHmLIqZ88AuJvLuyknLFegie3phbl4pVTE7JKnCIqhFUZ0y3hb+ckUwyzt1h8 Ip6Fwb5153oFvDGCmBa03thse64naSSLLxF2YV5nZdxlcK+vOqBZNZKAvAMgXK4a2JyP xNwg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699524894; x=1700129694; 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=aduCSyHEYIhu+IO52anhhUtjmJcDS68d0TTkBLTxAgE=; b=CyeaD/tSed5ULDuOPMxr9DYTezgKrig00P/dTNNrxLINaSYyZF+yv7+nK7p77EMvJq k41tjIY30Yb2TWvzQ2iiWbfbrBX4wjl+6UQjVlCPacfnNcf6Ecw0Rs+R82QnTYA5ebYf yx48gZjfbJwFyps+1LSQyqVhorOqSbr0RlaiUzsEgRJs4ScaDJV9m723xZ6RWyV/q1Mf 5owYD5a2tvI2FIB5CWLCB8HtMQSlNcXEKlR4S5ajUV1N3tIwI5EtzxbtOtPtXCr6tB+G tQ3Ey+4rC+7SOjz5x0Q5+VFQ0AA5PxEIG4RF0WF1+b0E7RVDUKC2NpMmOnALz8p1Ha1f hv3A== X-Gm-Message-State: AOJu0YwhqmH55W0m9oSdKh6lNg4IfUuup4r5fXwiJWZH4yH88j2jPsiL rchNw3EZicB2dP+EHMepukOhCQ== X-Google-Smtp-Source: AGHT+IEYIB6ScZWDEgpcZ/S2cHjVchJEeCFHQxgRNVNplqpr7l/I6Xe67qLyHn6zzj6QW+TyS8tvqg== X-Received: by 2002:a1c:7516:0:b0:40a:28b1:70f8 with SMTP id o22-20020a1c7516000000b0040a28b170f8mr3876852wmc.21.1699524893988; Thu, 09 Nov 2023 02:14:53 -0800 (PST) Received: from vingu-book.. ([2a01:e0a:f:6020:26e5:c6da:63bc:dd99]) by smtp.gmail.com with ESMTPSA id m17-20020a05600c4f5100b003fefb94ccc9sm1611816wmq.11.2023.11.09.02.14.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Nov 2023 02:14:53 -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, 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 v6 4/7] energy_model: Use a fixed reference frequency Date: Thu, 9 Nov 2023 11:14:35 +0100 Message-Id: <20231109101438.1139696-5-vincent.guittot@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231109101438.1139696-1-vincent.guittot@linaro.org> References: <20231109101438.1139696-1-vincent.guittot@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 b9caa01dfac4..c19e7effe764 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_per= f_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; =20 @@ -241,11 +241,11 @@ static inline unsigned long em_cpu_energy(struct em_p= erf_domain *pd, */ cpu =3D cpumask_first(to_cpumask(pd->cpus)); scale_cpu =3D arch_scale_cpu_capacity(cpu); - ps =3D &pd->table[pd->nr_perf_states - 1]; + ref_freq =3D arch_scale_freq_ref(cpu); =20 max_util =3D map_util_perf(max_util); max_util =3D min(max_util, allowed_cpu_cap); - freq =3D map_util_freq(max_util, ps->frequency, scale_cpu); + freq =3D map_util_freq(max_util, ref_freq, scale_cpu); =20 /* * Find the lowest performance state of the Energy Model above the --=20 2.34.1