From patchwork Thu Sep 5 09:26:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Loehle X-Patchwork-Id: 13792014 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2FF61197A7A; Thu, 5 Sep 2024 09:27:31 +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=1725528454; cv=none; b=LJf83AtHipmkKpwcBNsbeBxyyydIEuKom9NQDjq/Y4g57TG4l9vqHedCe7VSWS79IPyCr5Aak3LGB+PPctXlmEmM2RvSppKPbbgLM8/z6RaZP0bWKLIY0qk9D+JnXJWzPFDnCyKwe+ICuHp684yfHnL5SvREe5gDolnwLP5K3mE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725528454; c=relaxed/simple; bh=edp627popAZTkRr7v+xqmAOIkA2ak/45oKZuSXAezOk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=f48KbMCzxa11yg/0QBBjX/sjZtUvhWVVSGs82WN+h7Lxv3bZ3T8MMIhNWOEdne5eFZqU3/Sg297LaoBlkg8dud1RbKHYRwxBjQKOSUZSREzjZ+lJUn1EYIE3wgEXrnEHVs2eI8PGdO+lIW2DNmNhns1qSkW4Od9r31i7YoPXrKM= 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 0EE271063; Thu, 5 Sep 2024 02:27:58 -0700 (PDT) Received: from e127648.arm.com (unknown [10.57.75.86]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 130043F73F; Thu, 5 Sep 2024 02:27:26 -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 3/8] TEST: cpufreq/schedutil: Linear iowait boost step Date: Thu, 5 Sep 2024 10:26:40 +0100 Message-Id: <20240905092645.2885200-4-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 In preparation for capping iowait boost make the steps linear as opposed to doubling. Signed-off-by: Christian Loehle --- kernel/sched/cpufreq_schedutil.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index eece6244f9d2..7810374aaa5b 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -267,7 +267,8 @@ static void sugov_iowait_boost(struct sugov_cpu *sg_cpu, u64 time, /* Double the boost at each request */ if (sg_cpu->iowait_boost) { sg_cpu->iowait_boost = - min_t(unsigned int, sg_cpu->iowait_boost << 1, SCHED_CAPACITY_SCALE); + min_t(unsigned int, + sg_cpu->iowait_boost + IOWAIT_BOOST_MIN, SCHED_CAPACITY_SCALE); return; } @@ -308,11 +309,9 @@ static unsigned long sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time, /* * No boost pending; reduce the boost value. */ - sg_cpu->iowait_boost >>= 1; - if (sg_cpu->iowait_boost < IOWAIT_BOOST_MIN) { - sg_cpu->iowait_boost = 0; + sg_cpu->iowait_boost -= IOWAIT_BOOST_MIN; + if (!sg_cpu->iowait_boost) return 0; - } } sg_cpu->iowait_boost_pending = false;