From patchwork Sun Aug 27 23:31:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qais Yousef X-Patchwork-Id: 13367413 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 27E11C83F17 for ; Sun, 27 Aug 2023 23:32:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229534AbjH0XcY (ORCPT ); Sun, 27 Aug 2023 19:32:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229577AbjH0XcU (ORCPT ); Sun, 27 Aug 2023 19:32:20 -0400 Received: from mail-wm1-x336.google.com (mail-wm1-x336.google.com [IPv6:2a00:1450:4864:20::336]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0F5E3106 for ; Sun, 27 Aug 2023 16:32:18 -0700 (PDT) Received: by mail-wm1-x336.google.com with SMTP id 5b1f17b1804b1-401187f8071so16394715e9.0 for ; Sun, 27 Aug 2023 16:32:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=layalina-io.20221208.gappssmtp.com; s=20221208; t=1693179136; x=1693783936; 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=t2o3qJKDZS4dFtdaQhs245LyTqmuk7rvrkvinnh/CtI=; b=JvaSnzVw+G2fl49nyDo/YXbHUkfFUiTIHGuH+Sudr/on+fzDWXe5PtGWMmbcdUSKCq Mf8RtGMPZZLRXqf2wjmmtBs2+ibHX56kO+M9YmRzSWNxfOkMbxFJB/HFpLHJ5XN6p7Tp AvzluRDawzd8QiBhAxRBjN4ZOT6ZsCtE7QI07hjIVw2YLAZKltwHvlKTnGLohChwWvvV gvG4fpq7cNdmqY2o9HvkbkDEh1kAX05wnACaqNdj7//7c8sQV8MbOmLpWibKezs9YZUP pGCD4ei3HjM04fyxhorlv2Fi1Dnxi8saH1sJIUyo9vhrLk3bxTug+aGgiZ+L5HkibPQh 6e+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693179136; x=1693783936; 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=t2o3qJKDZS4dFtdaQhs245LyTqmuk7rvrkvinnh/CtI=; b=l0eXJ4C4eECm3aBlxr9pX9CO5R3vlr0Ij5sZIXU3ngBygrhYBawgJr5BaOlnCPIjN0 1yULVbqQFGrmL1JEQt0dJkrYFW3QGk14j11KvDR6+UMpxde2DpCZUOAOJThx3Bp1s7xC qV9PoT3KoiD4QDTibtWqbFAgsPizkP7fvreflhaurC0rBvyiHnSIpr3+VhSEQbNSb3yA LpktBmlNqEU7xQ0DeGgcNvv4qUEo+72egwvsFfTSiCWXOoMl5KKAq3pIlhwNm+ht2Yti 34XABlfnawmaBbKKirNPKoU/AR2HW51ix0g8e/RswwYg+yPrMQauVEM/d0yUPPGA3+QM ikPQ== X-Gm-Message-State: AOJu0Ywxk2FP2/TCZ2FlfEcqqHGw3SO64d2mix4Gl+soqU1k1Ov7qbXL 3W894de0F3HHWX6a+m71VLTP0Q== X-Google-Smtp-Source: AGHT+IG8+eLA6cvLBCh+GBlr/ZzPkhgG/yiuOJFhbmuRrvZ/TDbhFzbzUvp81jW1aWxqQn1XE/6lNw== X-Received: by 2002:a05:600c:b42:b0:3fe:1fd9:bedf with SMTP id k2-20020a05600c0b4200b003fe1fd9bedfmr18992148wmr.11.1693179136213; Sun, 27 Aug 2023 16:32:16 -0700 (PDT) Received: from airbuntu.. (host109-151-228-137.range109-151.btcentralplus.com. [109.151.228.137]) by smtp.gmail.com with ESMTPSA id 21-20020a05600c029500b003fe1a96845bsm12220395wmk.2.2023.08.27.16.32.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Aug 2023 16:32:15 -0700 (PDT) From: Qais Yousef To: Ingo Molnar , Peter Zijlstra , "Rafael J. Wysocki" , Viresh Kumar , Vincent Guittot , Dietmar Eggemann Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Lukasz Luba , Qais Yousef Subject: [RFC PATCH 2/7] sched/pelt: Add a new function to approximate runtime to reach given util Date: Mon, 28 Aug 2023 00:31:58 +0100 Message-Id: <20230827233203.1315953-3-qyousef@layalina.io> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230827233203.1315953-1-qyousef@layalina.io> References: <20230827233203.1315953-1-qyousef@layalina.io> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org It is basically the ramp-up time from 0 to a given value. Will be used later to implement new tunable to control response time for schedutil. Signed-off-by: Qais Yousef (Google) --- kernel/sched/pelt.c | 21 +++++++++++++++++++++ kernel/sched/sched.h | 1 + 2 files changed, 22 insertions(+) diff --git a/kernel/sched/pelt.c b/kernel/sched/pelt.c index 50322005a0ae..f673b9ab92dc 100644 --- a/kernel/sched/pelt.c +++ b/kernel/sched/pelt.c @@ -487,3 +487,24 @@ unsigned long approximate_util_avg(unsigned long util, u64 delta) return sa.util_avg; } + +/* + * Approximate the required amount of runtime in ms required to reach @util. + */ +u64 approximate_runtime(unsigned long util) +{ + struct sched_avg sa = {}; + u64 delta = 1024; // period = 1024 = ~1ms + u64 runtime = 0; + + if (unlikely(!util)) + return runtime; + + while (sa.util_avg < util) { + accumulate_sum(delta, &sa, 0, 0, 1); + ___update_load_avg(&sa, 0); + runtime++; + } + + return runtime; +} diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 5f76b8a75a9f..2b889ad399de 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2999,6 +2999,7 @@ unsigned long effective_cpu_util(int cpu, unsigned long util_cfs, struct task_struct *p); unsigned long approximate_util_avg(unsigned long util, u64 delta); +u64 approximate_runtime(unsigned long util); /* * DVFS decision are made at discrete points. If CPU stays busy, the util will