From patchwork Wed Nov 22 13:39:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincent Guittot X-Patchwork-Id: 13464884 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="GRNHLrYs" Received: from mail-wm1-x332.google.com (mail-wm1-x332.google.com [IPv6:2a00:1450:4864:20::332]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 71782D50 for ; Wed, 22 Nov 2023 05:39:14 -0800 (PST) Received: by mail-wm1-x332.google.com with SMTP id 5b1f17b1804b1-40790b0a224so31435075e9.0 for ; Wed, 22 Nov 2023 05:39:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1700660353; x=1701265153; 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=dGPyPKyzU47W/i11SE/AFAi0JIzecDdPwXQnIZMIKEk=; b=GRNHLrYscOHSpTFU4rxwGMjQkaDrUe59sLsQfeX4rXZ7ZLEbvVj4Mi1EE9pJoR/13n MqPOynwopaLTZvu7BFTqh3MgZn/IPI4lIYnXJpG3wWJFehhk+eQtNw09kEkI+0S7ZSoC 9qp0ubPweOlqQ0pfWS6CZu2Cth6mneB0+LcPSW8OBH5eydLLkRUXhKZa+SGkbuFdwtr/ lW2m3LFOOBtclTfauMYl/F5TDOTeAloRb16EHR7/3QWBbQeOiFOsyhB5yC4N9JgliNMf cVz9GunhkuQMzIWRORcfFjm33B5TwDgIoaZ8irWnUsm79mHTUof5tpSy/Y0KyNxsFp1X Zypw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700660353; x=1701265153; 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=dGPyPKyzU47W/i11SE/AFAi0JIzecDdPwXQnIZMIKEk=; b=iZUf/jtdRE2yPjXCiWI+O7ftZlyNb9c4VpfjPS+hDUZ0Bte4SILDSi7k/f7jw8Tzok i0JutTwZY+s877yckrCEEizbA15ljx8DdTLeBASG7e6lkNgIJfyQiaA6KDkL3kA0nRLf oJi9YfypQ9r2Zx+baz1TI6CMSemaoOjv/AN7Y1BDHiGHvPZiX3ubnSCKLTWoE4t+tgKB f6hBGWJyRIgcaMMFc6yYusnUiwtYglXj9xiwCvgYw0svWvAqT5OBFcDn5PfP2cyNSb5R ILFLH2othFMK2C1U1rTPSINh8wMV7jiWgfjv7+B1Ptly+74xppEuCgCVl5IzMbaf6dw0 Fz2A== X-Gm-Message-State: AOJu0YzPhL/mAeMoSv2gmO54NM6YecINbUXE3V1h4TfRb8I2u1FiVBV5 iX961kSwmqeO3keWttZtHppgMw== X-Google-Smtp-Source: AGHT+IEKilmCIG0iXXMek5xKP6m4yvWkniynljYS8f6YdDDcU0B1M4JwccnS0YG6TCHIEioMpY1VIA== X-Received: by 2002:a05:600c:1907:b0:409:50b4:3da8 with SMTP id j7-20020a05600c190700b0040950b43da8mr2417720wmq.38.1700660352813; Wed, 22 Nov 2023 05:39:12 -0800 (PST) Received: from vingu-book.. ([2a01:e0a:f:6020:3a2e:a7f5:93e6:508b]) by smtp.gmail.com with ESMTPSA id o31-20020a05600c511f00b00407752bd834sm2307386wms.1.2023.11.22.05.39.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Nov 2023 05:39:12 -0800 (PST) From: Vincent Guittot To: 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, rafael@kernel.org, viresh.kumar@linaro.org, qyousef@layalina.io, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Cc: lukasz.luba@arm.com, wyes.karny@amd.com, beata.michalska@arm.com, Vincent Guittot Subject: [PATCH v4 2/2] sched/schedutil: Rework iowait boost Date: Wed, 22 Nov 2023 14:39:04 +0100 Message-Id: <20231122133904.446032-3-vincent.guittot@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231122133904.446032-1-vincent.guittot@linaro.org> References: <20231122133904.446032-1-vincent.guittot@linaro.org> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Use the max value that has already been computed inside sugov_get_util() to cap the iowait boost and remove dependency with uclamp_rq_util_with() which is not used anymore. Signed-off-by: Vincent Guittot Acked-by: Rafael J. Wysocki --- kernel/sched/cpufreq_schedutil.c | 29 ++++++++------- kernel/sched/sched.h | 60 -------------------------------- 2 files changed, 14 insertions(+), 75 deletions(-) diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index f3acf2cf26ed..4ee8ad70be99 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -169,11 +169,12 @@ unsigned long sugov_effective_cpu_perf(int cpu, unsigned long actual, return max(min, max); } -static void sugov_get_util(struct sugov_cpu *sg_cpu) +static void sugov_get_util(struct sugov_cpu *sg_cpu, unsigned long boost) { unsigned long min, max, util = cpu_util_cfs_boost(sg_cpu->cpu); util = effective_cpu_util(sg_cpu->cpu, util, &min, &max); + util = max(util, boost); sg_cpu->bw_min = min; sg_cpu->util = sugov_effective_cpu_perf(sg_cpu->cpu, util, min, max); } @@ -266,18 +267,16 @@ static void sugov_iowait_boost(struct sugov_cpu *sg_cpu, u64 time, * This mechanism is designed to boost high frequently IO waiting tasks, while * being more conservative on tasks which does sporadic IO operations. */ -static void sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time, +static unsigned long sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time, unsigned long max_cap) { - unsigned long boost; - /* No boost currently required */ if (!sg_cpu->iowait_boost) - return; + return 0; /* Reset boost if the CPU appears to have been idle enough */ if (sugov_iowait_reset(sg_cpu, time, false)) - return; + return 0; if (!sg_cpu->iowait_boost_pending) { /* @@ -286,7 +285,7 @@ static void sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time, sg_cpu->iowait_boost >>= 1; if (sg_cpu->iowait_boost < IOWAIT_BOOST_MIN) { sg_cpu->iowait_boost = 0; - return; + return 0; } } @@ -296,10 +295,7 @@ static void sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time, * sg_cpu->util is already in capacity scale; convert iowait_boost * into the same scale so we can compare. */ - boost = (sg_cpu->iowait_boost * max_cap) >> SCHED_CAPACITY_SHIFT; - boost = uclamp_rq_util_with(cpu_rq(sg_cpu->cpu), boost, NULL); - if (sg_cpu->util < boost) - sg_cpu->util = boost; + return (sg_cpu->iowait_boost * max_cap) >> SCHED_CAPACITY_SHIFT; } #ifdef CONFIG_NO_HZ_COMMON @@ -329,6 +325,8 @@ static inline bool sugov_update_single_common(struct sugov_cpu *sg_cpu, u64 time, unsigned long max_cap, unsigned int flags) { + unsigned long boost; + sugov_iowait_boost(sg_cpu, time, flags); sg_cpu->last_update = time; @@ -337,8 +335,8 @@ static inline bool sugov_update_single_common(struct sugov_cpu *sg_cpu, if (!sugov_should_update_freq(sg_cpu->sg_policy, time)) return false; - sugov_get_util(sg_cpu); - sugov_iowait_apply(sg_cpu, time, max_cap); + boost = sugov_iowait_apply(sg_cpu, time, max_cap); + sugov_get_util(sg_cpu, boost); return true; } @@ -439,9 +437,10 @@ static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time) for_each_cpu(j, policy->cpus) { struct sugov_cpu *j_sg_cpu = &per_cpu(sugov_cpu, j); + unsigned long boost; - sugov_get_util(j_sg_cpu); - sugov_iowait_apply(j_sg_cpu, time, max_cap); + boost = sugov_iowait_apply(j_sg_cpu, time, max_cap); + sugov_get_util(j_sg_cpu, boost); util = max(j_sg_cpu->util, util); } diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index c1574cd388e7..e58a54bda77d 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -3058,59 +3058,6 @@ static inline bool uclamp_rq_is_idle(struct rq *rq) return rq->uclamp_flags & UCLAMP_FLAG_IDLE; } -/** - * uclamp_rq_util_with - clamp @util with @rq and @p effective uclamp values. - * @rq: The rq to clamp against. Must not be NULL. - * @util: The util value to clamp. - * @p: The task to clamp against. Can be NULL if you want to clamp - * against @rq only. - * - * Clamps the passed @util to the max(@rq, @p) effective uclamp values. - * - * If sched_uclamp_used static key is disabled, then just return the util - * without any clamping since uclamp aggregation at the rq level in the fast - * path is disabled, rendering this operation a NOP. - * - * Use uclamp_eff_value() if you don't care about uclamp values at rq level. It - * will return the correct effective uclamp value of the task even if the - * static key is disabled. - */ -static __always_inline -unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util, - struct task_struct *p) -{ - unsigned long min_util = 0; - unsigned long max_util = 0; - - if (!static_branch_likely(&sched_uclamp_used)) - return util; - - if (p) { - min_util = uclamp_eff_value(p, UCLAMP_MIN); - max_util = uclamp_eff_value(p, UCLAMP_MAX); - - /* - * Ignore last runnable task's max clamp, as this task will - * reset it. Similarly, no need to read the rq's min clamp. - */ - if (uclamp_rq_is_idle(rq)) - goto out; - } - - min_util = max_t(unsigned long, min_util, uclamp_rq_get(rq, UCLAMP_MIN)); - max_util = max_t(unsigned long, max_util, uclamp_rq_get(rq, UCLAMP_MAX)); -out: - /* - * Since CPU's {min,max}_util clamps are MAX aggregated considering - * RUNNABLE tasks with _different_ clamps, we can end up with an - * inversion. Fix it now when the clamps are applied. - */ - if (unlikely(min_util >= max_util)) - return min_util; - - return clamp(util, min_util, max_util); -} - /* Is the rq being capped/throttled by uclamp_max? */ static inline bool uclamp_rq_is_capped(struct rq *rq) { @@ -3148,13 +3095,6 @@ static inline unsigned long uclamp_eff_value(struct task_struct *p, return SCHED_CAPACITY_SCALE; } -static inline -unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util, - struct task_struct *p) -{ - return util; -} - static inline bool uclamp_rq_is_capped(struct rq *rq) { return false; } static inline bool uclamp_is_used(void)