From patchwork Wed Feb 24 06:39:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yue Hu X-Patchwork-Id: 387035 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3D6ABC433DB for ; Wed, 24 Feb 2021 06:41:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E2E0364DCF for ; Wed, 24 Feb 2021 06:41:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232661AbhBXGlD (ORCPT ); Wed, 24 Feb 2021 01:41:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39668 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232203AbhBXGk4 (ORCPT ); Wed, 24 Feb 2021 01:40:56 -0500 Received: from mail-pl1-x629.google.com (mail-pl1-x629.google.com [IPv6:2607:f8b0:4864:20::629]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1CA24C061574; Tue, 23 Feb 2021 22:40:16 -0800 (PST) Received: by mail-pl1-x629.google.com with SMTP id k22so603003pll.6; Tue, 23 Feb 2021 22:40:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=tnfLHKb8PnK3wMlFGuTjuy8dr5DaMueUKDvEoOo23ts=; b=ooV/NUuBeLTvju2bqo2BCkPvu05YTvy0x7E73rn1ZUvznH6in3YIWeAXT53Qp4Sxh2 uTBTm7Mw88eUKg4etJTddRf8oBZVSLq5ACgufuLGL+mrVc1wrsK56LDWcry0H5Z2k9SQ NKKTJ68GTXUtn+BtwuyzZ0cBTT2ov+CS/7+tO0mYSk2DSTzIctCC5DmtnX1N4KTlieCp V6EldqiK8B3VjR77gw9I5prYLD0lJmJmuRZPI2xHbz+94k0mo4pkZcbOPrvpdpzPiuMz LS7PZZESW1NXOWju32bBDCnoVAgfcIXGnSbKFJL7pcifC8ROK883tpzAqAC0kYW0OO+X ecUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=tnfLHKb8PnK3wMlFGuTjuy8dr5DaMueUKDvEoOo23ts=; b=WVlspZ1sCdH9dp2KDB9DBJcAxVGV3jlUY4wRVvugMSbLPzbSA6I9dyr21AKYH+Sp5T TABGHwJrUkPTaK0U7ejJ6mvrVg7MH9fOgORyZbwJOKVc+kOl44UDD+GgxE5uwDwYSGxc bqyflvcorjuf1eDOQx7lQoxG91CLgOZMbTw25LwrxyB4vcaELjZKsqXEyqkB+b937iOg k3+QDoSyRgidDV+i3pjfvL/QMAevh0ELK3oqNHkvAhZh9jbWDfrwFV16O9JPBrU65xbH qa4LsrdEQZqQtqTxcV+eL59LAIpyPHHz1bjh0HAICfmn4eECXqfL+tEUHM2vilB0yBvq uGFQ== X-Gm-Message-State: AOAM5338WYE6Ldqf8bQbj3dlWy7IOaynDOOTp9SDGFBeHHcpSFud8Sc1 Yz2AMC+O2Eys/mIw2psq4VY= X-Google-Smtp-Source: ABdhPJzfhIpP9eycfEJuLWaIZNlnuFikw6LElUxgzlG551RSSIOJFdm8o9rLnJOCyV/asXs202apfA== X-Received: by 2002:a17:90a:4a06:: with SMTP id e6mr2899624pjh.141.1614148815593; Tue, 23 Feb 2021 22:40:15 -0800 (PST) Received: from tj.ccdomain.com ([103.220.76.197]) by smtp.gmail.com with ESMTPSA id w2sm1132973pgh.54.2021.02.23.22.40.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Feb 2021 22:40:15 -0800 (PST) From: Yue Hu To: rjw@rjwysocki.net, viresh.kumar@linaro.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, huyue2@yulong.com, zbestahu@163.com Subject: [PATCH v2] cpufreq: schedutil: Call sugov_update_next_freq() before check to fast_switch_enabled Date: Wed, 24 Feb 2021 14:39:27 +0800 Message-Id: <20210224063927.1298-1-zbestahu@gmail.com> X-Mailer: git-send-email 2.29.2.windows.3 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Yue Hu Note that sugov_update_next_freq() may return false, that means the caller sugov_fast_switch() will do nothing except fast switch check. Similarly, sugov_deferred_update() also has unnecessary operations of raw_spin_{lock,unlock} in sugov_update_single_freq() for that case. So, let's call sugov_update_next_freq() before the fast switch check to avoid unnecessary behaviors above. Accordingly, update interface definition to sugov_deferred_update() and remove sugov_fast_switch() since we will call cpufreq_driver_fast_switch() directly instead. Signed-off-by: Yue Hu --- v2: remove sugov_fast_switch() and call cpufreq_driver_fast_switch() directly instead, also update minor log message. kernel/sched/cpufreq_schedutil.c | 29 ++++++++++++----------------- 1 file changed, 12 insertions(+), 17 deletions(-) diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index 41e498b..65fe2c8 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -114,19 +114,8 @@ static bool sugov_update_next_freq(struct sugov_policy *sg_policy, u64 time, return true; } -static void sugov_fast_switch(struct sugov_policy *sg_policy, u64 time, - unsigned int next_freq) +static void sugov_deferred_update(struct sugov_policy *sg_policy) { - if (sugov_update_next_freq(sg_policy, time, next_freq)) - cpufreq_driver_fast_switch(sg_policy->policy, next_freq); -} - -static void sugov_deferred_update(struct sugov_policy *sg_policy, u64 time, - unsigned int next_freq) -{ - if (!sugov_update_next_freq(sg_policy, time, next_freq)) - return; - if (!sg_policy->work_in_progress) { sg_policy->work_in_progress = true; irq_work_queue(&sg_policy->irq_work); @@ -368,16 +357,19 @@ static void sugov_update_single_freq(struct update_util_data *hook, u64 time, sg_policy->cached_raw_freq = cached_freq; } + if (!sugov_update_next_freq(sg_policy, time, next_f)) + return; + /* * This code runs under rq->lock for the target CPU, so it won't run * concurrently on two different CPUs for the same target and it is not * necessary to acquire the lock in the fast switch case. */ if (sg_policy->policy->fast_switch_enabled) { - sugov_fast_switch(sg_policy, time, next_f); + cpufreq_driver_fast_switch(sg_policy->policy, next_f); } else { raw_spin_lock(&sg_policy->update_lock); - sugov_deferred_update(sg_policy, time, next_f); + sugov_deferred_update(sg_policy); raw_spin_unlock(&sg_policy->update_lock); } } @@ -456,12 +448,15 @@ static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time) if (sugov_should_update_freq(sg_policy, time)) { next_f = sugov_next_freq_shared(sg_cpu, time); + if (!sugov_update_next_freq(sg_policy, time, next_f)) + goto unlock; + if (sg_policy->policy->fast_switch_enabled) - sugov_fast_switch(sg_policy, time, next_f); + cpufreq_driver_fast_switch(sg_policy->policy, next_f); else - sugov_deferred_update(sg_policy, time, next_f); + sugov_deferred_update(sg_policy); } - +unlock: raw_spin_unlock(&sg_policy->update_lock); }