From mboxrd@z Thu Jan 1 00:00:00 1970 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 13BE5ECAAD5 for ; Mon, 29 Aug 2022 15:49:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230102AbiH2PtG (ORCPT ); Mon, 29 Aug 2022 11:49:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50570 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230089AbiH2Pss (ORCPT ); Mon, 29 Aug 2022 11:48:48 -0400 Received: from mail-ed1-x52f.google.com (mail-ed1-x52f.google.com [IPv6:2a00:1450:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AD7B095ADC for ; Mon, 29 Aug 2022 08:48:43 -0700 (PDT) Received: by mail-ed1-x52f.google.com with SMTP id r4so10678645edi.8 for ; Mon, 29 Aug 2022 08:48:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc; bh=mHpjYI6QcaCSHOvbWt8Moq9oJMF1GJnVWRiLawfEmvo=; b=fSfztW46mx7xfnjr/sbNt5AUq47NnMbc350DFDBjC7UfwCT6yMIUbi3yADdtDc0WDZ +Ajn3EHfMJPZBSXH298Ab4y37Rh2GwUavapdnkTTite7EVYwHwXcORB8ldJ6DPdnWw99 IjpRJr/FkkU9nsG4jtHjEx6o0X0XyYKfjOs6q4b3QGsYl2Ru7o6HRgphEDb1hJPxFdn7 AHUh09YkdXOWOED6AuEFlqml4qdBnufqUaT3TjuTF1TVwcfxQPj1youLg+gySRB2U/2I LgMR398ZPcYVbTplWviuxQMqiA4NA9KqbO4ZnVWeCJ3eljiC6jiI+eZf+0Q4u3pMypqE 5EZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc; bh=mHpjYI6QcaCSHOvbWt8Moq9oJMF1GJnVWRiLawfEmvo=; b=W7aNZOiRwPDILPG36XRgs0inUagK0G8nTWRnE6hGRHTmrkxdomkeVSdK+fCAimhAc7 yByxpbx1h7UfDLbTBtdpyqAjITMC+MF4le6jWjbPiVrF5x4z1gjBPOT8Ix/G+eRXiWtj +YdD//UqrTAm5jK274q/RMzOyBVNhl1xIjPaBxRRpicF5D/E2cJMXkLzufwPRivYiAtt CHuRvN3ARklmcA1twmkuWwc52cwiaxFiI5GEIq0Dwu8/3I2Y/vSdsWnNyolQCEqbouu/ zo+9KUf2s94vd8XxHG4gJRlxQ21h0WMu/Bhrt/SZFFk2PWu94a1M9s5drSgMIr5xQIPs 3Bng== X-Gm-Message-State: ACgBeo3M+XcbXQTWXBQ+36iXfh46RA6/Iaium+6YVDw5x9aIwtqEKuN1 1Eiy20OTUPMI+DK0/57X1e4NmA== X-Google-Smtp-Source: AA6agR722GIJV6NOompv1BqGkAy1eLk7wqlzKoIk5XqcAbc0U9DZJK1dL3XP1xuYogSMM+O5vTORAQ== X-Received: by 2002:a05:6402:1f06:b0:447:f6a0:2f71 with SMTP id b6-20020a0564021f0600b00447f6a02f71mr11933223edb.243.1661788120784; Mon, 29 Aug 2022 08:48:40 -0700 (PDT) Received: from google.com (64.227.90.34.bc.googleusercontent.com. [34.90.227.64]) by smtp.gmail.com with ESMTPSA id p17-20020a056402501100b004481af6c760sm4276132eda.0.2022.08.29.08.48.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Aug 2022 08:48:40 -0700 (PDT) Date: Mon, 29 Aug 2022 15:48:37 +0000 From: Quentin Perret To: Peter Zijlstra Cc: Vincent Guittot , Dietmar Eggemann , Ingo Molnar , Morten Rasmussen , Vincent Donnefort , Patrick Bellasi , Abhijeet Dharmapurikar , Jian-Min , Qais Yousef , linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 1/1] sched/pelt: Introduce PELT multiplier Message-ID: References: <20220829055450.1703092-1-dietmar.eggemann@arm.com> <20220829055450.1703092-2-dietmar.eggemann@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Monday 29 Aug 2022 at 16:34:39 (+0200), Peter Zijlstra wrote: > On Mon, Aug 29, 2022 at 02:23:17PM +0000, Quentin Perret wrote: > > > I'll let folks in CC comment about their use-case in more details, but > > there's definitely been an interest in tuning this thing at run-time > > An interest and it making sense are two very distinct things that bear > no relation to one another in any way. And just to clarify something here as my first message was misleading, the run-time tuning of PELT HLs has been used in some Android products for a little while already, so it's more than just a mere 'interest'. That doesn't close the debate on whether this makes any sense, but I figured this should be mentioned :-)