From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f54.google.com (mail-wm1-f54.google.com [209.85.128.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2AF083BB126 for ; Wed, 9 Sep 2026 19:24:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.54 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788981858; cv=none; b=LWqNE3uvcNhEwhe1A//2yfZHj7hOEsjFhpwjfCay7KWL+f9kzA62BOkL07+ch/00juekMxPHwvY9ogs3LRP9L2ve6xWJoXy56e7xFnCNfIeokabxfLO5QSWz0prB50oUb1duC7pa3dy0DkQT4NnydgYQzuBYWqwLyY5skduPpmQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788981858; c=relaxed/simple; bh=nEewE9vNn2GKeus40xjVARF+cnc+CRqiCdYnkkQKlwc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZrM13w48M76XIKResEn/0ALvF4ROP89JRPmo7lq8bCAJLGLWNGbHKlaDt5fiujPhHomX2PNVopVuVw2QDGO+l4VJhnxIau5dfGkdOj2UB2T63oC0Sk9UA9QRfAmjRpkCmRY8P80CW1WtWg2ttvo1nzlD5Ak0w+lCQbS4/3JNa+Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=OGFVHknF; arc=none smtp.client-ip=209.85.128.54 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="OGFVHknF" Received: by mail-wm1-f54.google.com with SMTP id 5b1f17b1804b1-49b0d8bc2aaso76530815e9.0 for ; Wed, 09 Sep 2026 12:24:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1788981854; x=1789586654; 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:content-type; bh=xU/TVU9R6QqVQBU8DMj4Dr025QCTEz1Y5w5z0voxEUA=; b=OGFVHknFhzOw4audTOZBQVJ88n/kzsb7VO/F1kywWGgHZBIpqVu0/YJWXueKYD1AWH BPWGb2NvG1jMYxIUw/+X1VFk55QSI8FrD47eVQ8HJ4h4is5Bynrth8DSxuVUMsNKjKp7 Fip6DyJXIAMP4WTNls8WubPtPl8wpD/+xkf9BkKyGqOf91xeUoQ6wLeyH4fSGuuFzJO6 n+N1PAlco4ed3PgMEIMEXBewQBAKSsWhrDj/ovzYAH56K6qfbMU8iE1WyoqAZj7na0aY 7cjeW2NJLcViGXzkDcIet+efWwNOufFo2LC0GroE2R7439d8RoLfYWlaSE32ORWcwWzY yGYA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788981854; x=1789586654; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=xU/TVU9R6QqVQBU8DMj4Dr025QCTEz1Y5w5z0voxEUA=; b=Q7EDrg4IKGi6R5IoywN15z3T7CaQMID3pPbdiN+KrUK/JQO5/BeVrKONezotvTwbLM BYH+HZW+ussurIgrGDkM1h4/9N8tlHAO04zJqLHzKR2DBxineocf+AWMqmc2/aUrN06z wuM204RJeivyTRNRrIs7nv8vPEO29u1IPahffG/E2U/udc3XOHTwsa9MSiMKzcjMtGeu 1mE5mMLDShqOmNPcuA9Edx7Zt0RVNHPsFUNXzIbqrBYxqGupRst5gaA2KAQKZXwZbsqI bfajzemy0iX+a34J1eb+0cC3w0PBIEV6RAw1RlyJLjLnlyzeOGAsX61uqEy3hdCjVFQp ehcg== X-Forwarded-Encrypted: i=1; AKwUvBwzWSPpuYCTK4JH1Sic9E+bgf4zqpsVPDqwhmwfowrh3OjT9UJzBeeDqI2yltcMh9/DV1dbn6F4VTheWQw=@vger.kernel.org X-Gm-Message-State: AFuF++k7m0oTzRE/OWmrOU1lMvm+B9DoMpDnYCTizCeIzuxqbjfupiWb NJF6/S3T7M9O/tI3NyVpW0VIvs6voiDaKo4tEOffPjxWsLZcH50HCAxC X-Gm-Gg: AYBFou0OP4MfwhYpVR1+QTFMD79neG1brZIYf4d37sxjuHwMo2IO/w8X5sWbQQys1/N 2JfeSuhmqr5NqiGN0RYH3wmTHqWzIXqQczaL/hDhaEYTz2RjHXFlGFNvjo6AoRM0dFPR0UtjOC4 zuuy+sTJvU8s4eiyGBC2vg1XtDbepamHYpVwg/R/xP++V6ErE2GPzBJOKiZfb4gb7Uo4aJhxNmj LPwK17bY9wG3MABIprdxGe/JZ1KX2eAB3KKZ5BFJFkDAvQfIJGzaRsOv297LhoL85pGu55nYYaQ My7lOGSGNDbutscnWRcpUeEXVtwKlhO5MYgPtaoorKBQf6Ow9o02CsqNq3g9HLPOA7/zPjloV8C hziKpaNToJz8BFNavX52asF1uKD8izGn/G1oTCoGtwtzjaJ6BHAapv65bmRsoQyw6eHCbQwk+5R fKbHCCBhRX/gx4v/MLX5oYwiZH15W9nWyZryR3MiZkWX4jWLdTrJ2X4SFBeYKgYhN0wH/meleP+ 1c7Mcxn9/FuLFYKPJgnfJjW9xpZV2cCdvxUnXWtNuaj4RiJjyWRPK4= X-Received: by 2002:a05:600c:c173:b0:49c:cedc:3c36 with SMTP id 5b1f17b1804b1-49cf82a514cmr391436765e9.16.1788981854243; Wed, 09 Sep 2026 12:24:14 -0700 (PDT) Received: from localhost.localdomain (mob-31-26-103-238.net.vodafone.it. [31.26.103.238]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-49d26bf9490sm10925625e9.9.2026.09.09.12.24.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Sep 2026 12:24:12 -0700 (PDT) From: Oleg Keri To: Catalin Marinas , Will Deacon , Mark Rutland , Sumit Gupta , Beata Michalska , Prasanna Kumar T S M , Russell King , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Sudeep Holla , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Viresh Kumar Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, driver-core@lists.linux.dev, linux-pm@vger.kernel.org, Jonathan Cameron Subject: [PATCH v2 2/2] cpufreq: update capacity_freq_ref when the boost state changes Date: Wed, 9 Sep 2026 21:23:51 +0200 Message-ID: <20260909192351.33910-3-okerixx@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260909192351.33910-1-okerixx@gmail.com> References: <20260909192351.33910-1-okerixx@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit capacity_freq_ref is latched from policy->cpuinfo.max_freq by init_cpu_capacity_callback() on CPUFREQ_CREATE_POLICY, and never updated afterwards. cpufreq_frequency_table_cpuinfo() excludes CPUFREQ_BOOST_FREQ entries while boost is disabled, so on a system that boots with boost off the latched value is the non-boost maximum. Enabling boost later raises policy->cpuinfo.max_freq but leaves capacity_freq_ref behind. Two things then go wrong on arm64, where the AMU drives frequency invariance. amu_scale_freq_tick() caps the computed scale at SCHED_CAPACITY_SCALE, so a CPU running above capacity_freq_ref saturates at 1024: the scheduler cannot tell a boosted CPU from one at the sustained maximum, and utilisation is underestimated. And arch_freq_get_on_cpu(), which reverses that computation, cannot report more than capacity_freq_ref, so cpuinfo_avg_freq is pinned to the non-boost maximum. On a Snapdragon X2 Elite (Glymur) laptop with a 4032000 kHz sustained and a 4723200 kHz boost OPP, cpuinfo_avg_freq reads exactly 4032000 while the CPU runs at 4723200; a fixed workload completes in 1.72 s rather than the 2.01 s that frequency would imply. Factor the update out of init_cpu_capacity_callback() into topology_update_freq_ref() and call it from policy_set_boost(), which is the common path for the global boost knob, the per-policy one, and the CPU online path. Signed-off-by: Oleg Keri --- arch/arm/include/asm/topology.h | 1 + arch/arm64/include/asm/topology.h | 1 + arch/riscv/include/asm/topology.h | 1 + drivers/base/arch_topology.c | 19 +++++++++++++------ drivers/cpufreq/cpufreq.c | 2 ++ include/linux/arch_topology.h | 1 + include/linux/cpufreq.h | 7 +++++++ 7 files changed, 26 insertions(+), 6 deletions(-) diff --git a/arch/arm/include/asm/topology.h b/arch/arm/include/asm/topology.h index ad36b6570067..a776a79885ee 100644 --- a/arch/arm/include/asm/topology.h +++ b/arch/arm/include/asm/topology.h @@ -11,6 +11,7 @@ #ifndef CONFIG_BL_SWITCHER /* Replace task scheduler's default frequency-invariant accounting */ #define arch_set_freq_scale topology_set_freq_scale +#define arch_update_freq_ref topology_update_freq_ref #define arch_scale_freq_capacity topology_get_freq_scale #define arch_scale_freq_invariant topology_scale_freq_invariant #define arch_scale_freq_ref topology_get_freq_ref diff --git a/arch/arm64/include/asm/topology.h b/arch/arm64/include/asm/topology.h index b9eaf4ad7085..a4b96a7ee4a5 100644 --- a/arch/arm64/include/asm/topology.h +++ b/arch/arm64/include/asm/topology.h @@ -22,6 +22,7 @@ void update_freq_counters_refs(void); /* Replace task scheduler's default frequency-invariant accounting */ #define arch_scale_freq_tick topology_scale_freq_tick #define arch_set_freq_scale topology_set_freq_scale +#define arch_update_freq_ref topology_update_freq_ref #define arch_scale_freq_capacity topology_get_freq_scale #define arch_scale_freq_invariant topology_scale_freq_invariant #define arch_scale_freq_ref topology_get_freq_ref diff --git a/arch/riscv/include/asm/topology.h b/arch/riscv/include/asm/topology.h index fe1a8bf6902d..a363d72c174f 100644 --- a/arch/riscv/include/asm/topology.h +++ b/arch/riscv/include/asm/topology.h @@ -11,6 +11,7 @@ /* Replace task scheduler's default frequency-invariant accounting */ #define arch_scale_freq_tick topology_scale_freq_tick #define arch_set_freq_scale topology_set_freq_scale +#define arch_update_freq_ref topology_update_freq_ref #define arch_scale_freq_capacity topology_get_freq_scale #define arch_scale_freq_invariant topology_scale_freq_invariant #define arch_scale_freq_ref topology_get_freq_ref diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c index 8c5e47c28d9a..79eb1681065d 100644 --- a/drivers/base/arch_topology.c +++ b/drivers/base/arch_topology.c @@ -317,6 +317,18 @@ bool __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu) return !ret; } +void topology_update_freq_ref(const struct cpumask *cpus, unsigned int max_freq) +{ + int cpu; + + for_each_cpu(cpu, cpus) { + per_cpu(capacity_freq_ref, cpu) = max_freq; + freq_inv_set_max_ratio(cpu, + per_cpu(capacity_freq_ref, cpu) * HZ_PER_KHZ); + } +} +EXPORT_SYMBOL_GPL(topology_update_freq_ref); + void __weak freq_inv_set_max_ratio(int cpu, u64 max_rate) { } @@ -392,7 +404,6 @@ init_cpu_capacity_callback(struct notifier_block *nb, void *data) { struct cpufreq_policy *policy = data; - int cpu; if (val != CPUFREQ_CREATE_POLICY) return 0; @@ -403,11 +414,7 @@ init_cpu_capacity_callback(struct notifier_block *nb, cpumask_andnot(cpus_to_visit, cpus_to_visit, policy->related_cpus); - for_each_cpu(cpu, policy->related_cpus) { - per_cpu(capacity_freq_ref, cpu) = policy->cpuinfo.max_freq; - freq_inv_set_max_ratio(cpu, - per_cpu(capacity_freq_ref, cpu) * HZ_PER_KHZ); - } + topology_update_freq_ref(policy->related_cpus, policy->cpuinfo.max_freq); if (cpumask_empty(cpus_to_visit)) { if (raw_capacity) { diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 96515880b4ac..a70805a1d9d3 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -594,6 +594,8 @@ static int policy_set_boost(struct cpufreq_policy *policy, bool enable) return ret; } + arch_update_freq_ref(policy->related_cpus, policy->cpuinfo.max_freq); + return 0; } diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h index ebd7f8935f96..4974f5e1a7fe 100644 --- a/include/linux/arch_topology.h +++ b/include/linux/arch_topology.h @@ -31,6 +31,7 @@ static inline unsigned long topology_get_freq_scale(int cpu) void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq, unsigned long max_freq); +void topology_update_freq_ref(const struct cpumask *cpus, unsigned int max_freq); bool topology_scale_freq_invariant(void); enum scale_freq_source { diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 35ce665edfd8..5b904e13eb21 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -1235,6 +1235,13 @@ void arch_set_freq_scale(const struct cpumask *cpus, } #endif +#ifndef arch_update_freq_ref +static __always_inline +void arch_update_freq_ref(const struct cpumask *cpus, unsigned int max_freq) +{ +} +#endif + /* the following are really really optional */ extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs; -- 2.55.0