From patchwork Thu Sep 5 09:26:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Loehle X-Patchwork-Id: 13792015 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 8D5CF197A7A; Thu, 5 Sep 2024 09:27:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725528458; cv=none; b=GnzO9eYNn+7lGgcKStWzvLIk6fAZU6HxeLYlLdmcDPQCsTtvo1yxDYSCD4O2M1nB4NaJKujU0uqEMcgaSAOp+eKf5pas4HFRARsRb///eM08dmFrk1I/7/RulYjknB+nn+/cl7117yu/kAxLU4pXktNNxGpUKkLjR5n2C9hwoZ0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725528458; c=relaxed/simple; bh=WoLUFlTPkqhx9dGHUiTDC3K2yeV+M3vPQWQiwZWIiQI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=iShcu17YaRDW3+JnE4iKnDzW1DRe4h65tAxmGYS9bwpEOD9V5gvi7mbWeAPdeIEnNh+tqQiMayVSanpFGKoIHT1hVL4Rc5UTU7V0Hu6iAbLTKNyp6hSKyn2HNUml0kxoFvVI00gtRhoyHnKqxTIlXwxtZptcbngVeYpUIguMWqU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id AEA461063; Thu, 5 Sep 2024 02:28:02 -0700 (PDT) Received: from e127648.arm.com (unknown [10.57.75.86]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id D99BE3F73F; Thu, 5 Sep 2024 02:27:31 -0700 (PDT) From: Christian Loehle To: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, rafael@kernel.org, peterz@infradead.org Cc: juri.lelli@redhat.com, mingo@redhat.com, dietmar.eggemann@arm.com, vschneid@redhat.com, vincent.guittot@linaro.org, Johannes.Thumshirn@wdc.com, adrian.hunter@intel.com, ulf.hansson@linaro.org, bvanassche@acm.org, andres@anarazel.de, asml.silence@gmail.com, linux-block@vger.kernel.org, io-uring@vger.kernel.org, qyousef@layalina.io, dsmythies@telus.net, axboe@kernel.dk, Christian Loehle Subject: [RFC PATCH 4/8] TEST: cpufreq/schedutil: iowait boost cap sysfs Date: Thu, 5 Sep 2024 10:26:41 +0100 Message-Id: <20240905092645.2885200-5-christian.loehle@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240905092645.2885200-1-christian.loehle@arm.com> References: <20240905092645.2885200-1-christian.loehle@arm.com> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add a knob to cap applied iowait_boost per sysfs. This is to test for potential regressions. Signed-off-by: Christian Loehle --- kernel/sched/cpufreq_schedutil.c | 38 ++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index 7810374aaa5b..5324f07fc93a 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -11,6 +11,7 @@ struct sugov_tunables { struct gov_attr_set attr_set; unsigned int rate_limit_us; + unsigned int iowait_boost_cap; }; struct sugov_policy { @@ -35,6 +36,8 @@ struct sugov_policy { bool limits_changed; bool need_freq_update; + + unsigned int iowait_boost_cap; }; struct sugov_cpu { @@ -316,6 +319,9 @@ static unsigned long sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time, sg_cpu->iowait_boost_pending = false; + if (sg_cpu->iowait_boost > sg_cpu->sg_policy->iowait_boost_cap) + sg_cpu->iowait_boost = sg_cpu->sg_policy->iowait_boost_cap; + /* * sg_cpu->util is already in capacity scale; convert iowait_boost * into the same scale so we can compare. @@ -554,6 +560,14 @@ static ssize_t rate_limit_us_show(struct gov_attr_set *attr_set, char *buf) return sprintf(buf, "%u\n", tunables->rate_limit_us); } + +static ssize_t iowait_boost_cap_show(struct gov_attr_set *attr_set, char *buf) +{ + struct sugov_tunables *tunables = to_sugov_tunables(attr_set); + + return sprintf(buf, "%u\n", tunables->iowait_boost_cap); +} + static ssize_t rate_limit_us_store(struct gov_attr_set *attr_set, const char *buf, size_t count) { @@ -572,10 +586,30 @@ rate_limit_us_store(struct gov_attr_set *attr_set, const char *buf, size_t count return count; } +static ssize_t +iowait_boost_cap_store(struct gov_attr_set *attr_set, const char *buf, size_t count) +{ + struct sugov_tunables *tunables = to_sugov_tunables(attr_set); + struct sugov_policy *sg_policy; + unsigned int iowait_boost_cap; + + if (kstrtouint(buf, 10, &iowait_boost_cap)) + return -EINVAL; + + tunables->iowait_boost_cap = iowait_boost_cap; + + list_for_each_entry(sg_policy, &attr_set->policy_list, tunables_hook) + sg_policy->iowait_boost_cap = iowait_boost_cap; + + return count; +} + static struct governor_attr rate_limit_us = __ATTR_RW(rate_limit_us); +static struct governor_attr iowait_boost_cap = __ATTR_RW(iowait_boost_cap); static struct attribute *sugov_attrs[] = { &rate_limit_us.attr, + &iowait_boost_cap.attr, NULL }; ATTRIBUTE_GROUPS(sugov); @@ -765,6 +799,8 @@ static int sugov_init(struct cpufreq_policy *policy) tunables->rate_limit_us = cpufreq_policy_transition_delay_us(policy); + tunables->iowait_boost_cap = SCHED_CAPACITY_SCALE; + policy->governor_data = sg_policy; sg_policy->tunables = tunables; @@ -834,6 +870,8 @@ static int sugov_start(struct cpufreq_policy *policy) sg_policy->limits_changed = false; sg_policy->cached_raw_freq = 0; + sg_policy->iowait_boost_cap = SCHED_CAPACITY_SCALE; + sg_policy->need_freq_update = cpufreq_driver_test_flags(CPUFREQ_NEED_UPDATE_LIMITS); if (policy_is_shared(policy))