From patchwork Tue Dec 12 14:27:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincent Guittot X-Patchwork-Id: 13489337 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A7488C4332F for ; Tue, 12 Dec 2023 14:28:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=O8ad7phbWG/9GenfgqhjkWsgg1Jdw6R4B8Lg6VrbMco=; b=GnW8g5Dn3NAF1o QsngEZ2Ns2MHylmJ14/a+kM79VQaPjIOSKu0rq27ZimJgl9tdISX8O1zOUCd+t23iZyLRZTQ4oGKl MYI63LNG/huJMQgYPFwq/uhQ5tXlDptPysNsbG/DIa8b3MHLwfsK5MxSKq5FU4OKcA2MgxG4evfMq PwIFVGirMZK+wvffKc1+4HnweT8v4suZXUhY2+/pVah5Ff9QB12bEBjvhLNPn6oAayQ1d7owB483F 8AjBOTAA7EYPMF2h/sbtmVtzVvizAUGJU2gzGnlFb/t9jG4aO9otqUTcheUtKaF8xFtY326UUM5vt 91wLy+sahrdtvRJvW+3w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rD3jj-00Bu2k-0F; Tue, 12 Dec 2023 14:27:51 +0000 Received: from mail-wm1-x331.google.com ([2a00:1450:4864:20::331]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rD3jb-00BtyN-0Q for linux-arm-kernel@lists.infradead.org; Tue, 12 Dec 2023 14:27:45 +0000 Received: by mail-wm1-x331.google.com with SMTP id 5b1f17b1804b1-40c256ffdbcso59190235e9.2 for ; Tue, 12 Dec 2023 06:27:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1702391258; x=1702996058; darn=lists.infradead.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=gcWN9DAKeqNVxfGMQOa8sW2gEdyays6xiY37i8hYsMI=; b=PKk373PRbXWJ0YfTt/Uz6qCkfKEPtnyBQy9g7JRxOoKgZQhhOaBLGylhalhgBc9/9L xUcXtnt2Uc4AqT2IKaTq5LZVULtZRc89dfc54PJN6BMLQ1/09BFw7ULWPBP9uPPlTxkw g65vCE1oYcYc5+tPKm9viwmhFvqhTx9pDMHJ7pIuGCQ4jDBS8zU2rkK3kKKUsy8aXBR0 dGAHvBoiEhAR0eo09zazWFx/+moWfqpQXYbq9PIhP3PTJhd1wWoizrK5qKEFiV7d9WT4 SnoRucTfO1xL3GOHkT8FjWkSj2nDd2Ee2N8m5IvPcfzCgqbuVVdlMMQyIYJsF7OoKHl2 WBnQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702391258; x=1702996058; 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=gcWN9DAKeqNVxfGMQOa8sW2gEdyays6xiY37i8hYsMI=; b=ihJYn+zKpVGzytci3R2GVNCFLROWxPxbpXNSk7Fjgawu8QvAEAC3rcTzIkK0sU0HHc ezDDED8n1nOkcptL1oA2HU+aglx2ih9OdPsyL/09WLjWTyLiux8SX6haHNPjv3JZnb+Z lKQJu5wAClwIq1IjMYMSF081jNnCwtCgypPVmWfblEJK+YvmzBRzqE7/BqjNTHHqhZ8t 0zSfpo4AosL/PZ2vx6a2Qx6ebcb608+FYvDrJo+rTifraNJH0W38XDtvO4/cNX5LENHi L3k6LWs+x/QqS9Rhz7mqzZwc3EWD5R6o66pKyhmHryFB3dNTIp5c6snJ9L6wlZ7dp5fY ArwA== X-Gm-Message-State: AOJu0Yyk1K7Ofitq6IErT1bxGcfYfpcHudcTf3T1q3wG5cOKrSWQ6qLI zh3V3uzV5huutFw+1p8m3XOz4w== X-Google-Smtp-Source: AGHT+IEgK2As3VnaEW3NpzD9+F0127H9s9y2RClkz+smDDtp0C3MHYd7jiwZSVSc0aF0fZIRdJ5kXA== X-Received: by 2002:a05:600c:ac8:b0:405:3ae6:2413 with SMTP id c8-20020a05600c0ac800b004053ae62413mr3182722wmr.25.1702391257548; Tue, 12 Dec 2023 06:27:37 -0800 (PST) Received: from vingu-book.. ([2a01:e0a:f:6020:a004:6e24:43ee:dd81]) by smtp.gmail.com with ESMTPSA id fc7-20020a05600c524700b0040c44cb251dsm9078291wmb.46.2023.12.12.06.27.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Dec 2023 06:27:36 -0800 (PST) From: Vincent Guittot To: catalin.marinas@arm.com, will@kernel.org, sudeep.holla@arm.com, rafael@kernel.org, viresh.kumar@linaro.org, agross@kernel.org, andersson@kernel.org, konrad.dybcio@linaro.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, lukasz.luba@arm.com, rui.zhang@intel.com, mhiramat@kernel.org, daniel.lezcano@linaro.org, amit.kachhap@gmail.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: Vincent Guittot Subject: [PATCH 1/4] cpufreq: Add a cpufreq pressure feedback for the scheduler Date: Tue, 12 Dec 2023 15:27:27 +0100 Message-Id: <20231212142730.998913-2-vincent.guittot@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231212142730.998913-1-vincent.guittot@linaro.org> References: <20231212142730.998913-1-vincent.guittot@linaro.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231212_062743_165976_4A76B836 X-CRM114-Status: GOOD ( 17.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Provide to the scheduler a feedback about the temporary max available capacity. Unlike arch_update_thermal_pressure, this doesn't need to be filtered as the pressure will happen for dozens ms or more. Signed-off-by: Vincent Guittot --- drivers/cpufreq/cpufreq.c | 48 +++++++++++++++++++++++++++++++++++++++ include/linux/cpufreq.h | 10 ++++++++ 2 files changed, 58 insertions(+) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 44db4f59c4cc..7d5f71be8d29 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -2563,6 +2563,50 @@ int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu) } EXPORT_SYMBOL(cpufreq_get_policy); +DEFINE_PER_CPU(unsigned long, cpufreq_pressure); +EXPORT_PER_CPU_SYMBOL_GPL(cpufreq_pressure); + +/** + * cpufreq_update_pressure() - Update cpufreq pressure for CPUs + * @cpus : The related CPUs for which max capacity has been reduced + * @capped_freq : The maximum allowed frequency that CPUs can run at + * + * Update the value of cpufreq pressure for all @cpus in the mask. The + * cpumask should include all (online+offline) affected CPUs, to avoid + * operating on stale data when hot-plug is used for some CPUs. The + * @capped_freq reflects the currently allowed max CPUs frequency due to + * freq_qos capping. It might be also a boost frequency value, which is bigger + * than the internal 'capacity_freq_ref' max frequency. In such case the + * pressure value should simply be removed, since this is an indication that + * there is no capping. The @capped_freq must be provided in kHz. + */ +static void cpufreq_update_pressure(const struct cpumask *cpus, + unsigned long capped_freq) +{ + unsigned long max_capacity, capacity, pressure; + u32 max_freq; + int cpu; + + cpu = cpumask_first(cpus); + max_capacity = arch_scale_cpu_capacity(cpu); + max_freq = arch_scale_freq_ref(cpu); + + /* + * Handle properly the boost frequencies, which should simply clean + * the thermal pressure value. + */ + if (max_freq <= capped_freq) + capacity = max_capacity; + else + capacity = mult_frac(max_capacity, capped_freq, max_freq); + + pressure = max_capacity - capacity; + + + for_each_cpu(cpu, cpus) + WRITE_ONCE(per_cpu(cpufreq_pressure, cpu), pressure); +} + /** * cpufreq_set_policy - Modify cpufreq policy parameters. * @policy: Policy object to modify. @@ -2584,6 +2628,7 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy, { struct cpufreq_policy_data new_data; struct cpufreq_governor *old_gov; + struct cpumask *cpus; int ret; memcpy(&new_data.cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo)); @@ -2618,6 +2663,9 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy, policy->max = __resolve_freq(policy, policy->max, CPUFREQ_RELATION_H); trace_cpu_frequency_limits(policy); + cpus = policy->related_cpus; + cpufreq_update_pressure(cpus, policy->max); + policy->cached_target_freq = UINT_MAX; pr_debug("new min and max freqs are %u - %u kHz\n", diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index afda5f24d3dd..b1d97edd3253 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -241,6 +241,12 @@ struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy); void cpufreq_enable_fast_switch(struct cpufreq_policy *policy); void cpufreq_disable_fast_switch(struct cpufreq_policy *policy); bool has_target_index(void); + +DECLARE_PER_CPU(unsigned long, cpufreq_pressure); +static inline unsigned long cpufreq_get_pressure(int cpu) +{ + return per_cpu(cpufreq_pressure, cpu); +} #else static inline unsigned int cpufreq_get(unsigned int cpu) { @@ -263,6 +269,10 @@ static inline bool cpufreq_supports_freq_invariance(void) return false; } static inline void disable_cpufreq(void) { } +static inline unsigned long cpufreq_get_pressure(int cpu) +{ + return 0; +} #endif #ifdef CONFIG_CPU_FREQ_STAT