Received: by 10.223.176.5 with SMTP id f5csp402694wra; Fri, 9 Feb 2018 00:41:43 -0800 (PST) X-Google-Smtp-Source: AH8x226C5jltD5ZRTqjcINInDXhBAFITm0DDr61w6GAkjuKr9Sx2U/RkbQWkft3ekn1q7ysmMKqu X-Received: by 2002:a17:902:1683:: with SMTP id h3-v6mr1845873plh.433.1518165703647; Fri, 09 Feb 2018 00:41:43 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1518165703; cv=none; d=google.com; s=arc-20160816; b=JFsta0cejPJrE8MuvK1IYNrRN506+yTQZVDwAZ+OTGXJbrWYWxXghKip6Wbd8P9LZd lBxYm/UEs5/JpzFvFSr6s2zmgop3NiUHcx6D7EseLCQAEpIv9WC+PqElSMRNzu70Hojo BeA1O1gmiZUF4sX2o1AX+VICaumeQddmAjzptIpG7+nqLJ9AN3U69HOK08Hiap/B/bsy VZNuWsVov9aZH6N4jn+NVGjdNd4ZMNxP7xQw/WDnA5mA4PL7Snv8plwZQBGFFoDbP3uF YcF/JGUpvgbLvgBY2smzvE45DqrGF8Px5/SLNL3VlxwMWSbx2nP8rcmS9xxQ17W1FV3A Rz3A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date:dkim-signature:arc-authentication-results; bh=P7TuOYawXZsW6sm5wh3QYVh9oaW9H2ok/XMJdb+kMiA=; b=FKIUoSPaL77pPzpfB6xS+Rg2jAbSP3RZhTZ4CQivXfmxSD5pTjjHgPLEZ8GyoiE9zS /ohFoOZJvEIRJipvieAS28icomY+QMmOBppXOUwdqVF6AmTWstn4ya3BIqaI1KM36os6 2Or4aRGoAh9uTnQFGMD2cgrh+quLJ97gdectGYZXeIxEk8v8KVCXEqfHy4aewcbsRAA7 ABHsSQaK7j4a+3Pfvt5/aVeRp0JY9bfuY75O3qnnnRr9ds1Hr5BoEiX6siyKMNhMDRM8 HKwjsoUwcMJaXLtdu4bEpp+A3E9m2NVb4bBEkNWMT4yiIakVPU+YMwBRrzsVg34zsnjJ lnFQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=GXUujt/8; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id p4-v6si1250163plo.295.2018.02.09.00.41.26; Fri, 09 Feb 2018 00:41:43 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=GXUujt/8; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751070AbeBIIko (ORCPT + 99 others); Fri, 9 Feb 2018 03:40:44 -0500 Received: from mail-pg0-f53.google.com ([74.125.83.53]:42271 "EHLO mail-pg0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750890AbeBIIkn (ORCPT ); Fri, 9 Feb 2018 03:40:43 -0500 Received: by mail-pg0-f53.google.com with SMTP id m28so3176151pgc.9 for ; Fri, 09 Feb 2018 00:40:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=P7TuOYawXZsW6sm5wh3QYVh9oaW9H2ok/XMJdb+kMiA=; b=GXUujt/8aSW9jyWxurVv3exRZcz0kz18NMHhVG+aPA6iQGLM1bLJ87btnuVmOobYHO PexoOiM/TyyHuXSrMk2lTVm/apIZO8GHkQjtp22kiODCbUCFyT7Xf7CpPqC9kh7GjmWW j+wrNC7+F668B9nuUhCg5Xer2PPfrXEjX+LVI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=P7TuOYawXZsW6sm5wh3QYVh9oaW9H2ok/XMJdb+kMiA=; b=axtbjm9Q7rAnZkAwfqRdKbwnK7Jf3EujXS0Tg40xBFvW2FK82jMqB5c0FKk9Pniq7K dPMqXaUs5DwvTxzwficx99rTrdw7Ij3XkbbkjPVrRBvfhy/R9HNaBNvZObZfln+wwkQs FLC/v7DBMAsyjYJX7b7mVF6AOxl+67sLN3QugosUuQhDqJ5/sFpiYDfMlPuomWxiVkgW 5GIcGqXvYFUJ8o5wPXYu5hrJ7hLHlFW2xutwviygRRD5q8aELCSfzEFKkTokCFy8nbV5 5Qz/U+G2FNlyuJmJUoGuJWLr8ITdm4EyW6WyhqrPIOILVtGyhuTdAUbCf3O5rvfxfg2w GiKA== X-Gm-Message-State: APf1xPBhmM+7FBqhGVNxBJgj97ushhZ8Rnx3kkB1CGCKmcQpd0aQuW1S 4N1o9k9PlmRH99EWvYIb+LHf9A== X-Received: by 10.99.148.17 with SMTP id m17mr1707389pge.367.1518165642773; Fri, 09 Feb 2018 00:40:42 -0800 (PST) Received: from localhost ([122.172.61.199]) by smtp.gmail.com with ESMTPSA id q62sm4855241pfd.48.2018.02.09.00.40.41 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 09 Feb 2018 00:40:41 -0800 (PST) Date: Fri, 9 Feb 2018 14:10:39 +0530 From: Viresh Kumar To: Claudio Scordino Cc: Peter Zijlstra , Ingo Molnar , "Rafael J . Wysocki" , Patrick Bellasi , Dietmar Eggemann , Morten Rasmussen , Juri Lelli , Vincent Guittot , Todd Kjos , Joel Fernandes , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] cpufreq: schedutil: rate limits for SCHED_DEADLINE Message-ID: <20180209084039.GZ28462@vireshk-i7> References: <1518109302-8239-1-git-send-email-claudio@evidence.eu.com> <20180209035143.GX28462@vireshk-i7> <197c26ba-c2a6-2de7-dffa-5b884079f746@evidence.eu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <197c26ba-c2a6-2de7-dffa-5b884079f746@evidence.eu.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09-02-18, 09:02, Claudio Scordino wrote: > If I'm not wrong, at the hardware level we do have a physical rate limit (as we cannot trigger a frequency update when there is one already on-going). > Don't know if this could somehow mitigate such effect. Yeah, so in the worst case we will start a new freq-change right after the previous one has finished. -- viresh