Received: by 2002:a05:6a10:206:0:0:0:0 with SMTP id 6csp980892pxj; Thu, 27 May 2021 16:55:28 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxd5ZOLHfLqvVj0GzSAftCu/YM5dFs19Fkw6r4M5owsNUAWSDRH2r3Z8ZMMMrufLAkfhTBu X-Received: by 2002:a17:906:148f:: with SMTP id x15mr6277267ejc.535.1622159728004; Thu, 27 May 2021 16:55:28 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1622159727; cv=none; d=google.com; s=arc-20160816; b=XGlBZNlySc5B9PqyfqDXIk9Nz5zlGoLUw9nhjLpZbU2jDXoNxNIReq2cFN/RlBh5qf 040RSKrOqE8Sg6z8MX6E+Df9WpAjI02z07TaREpNv0it7CDfazKaHN5YBag09phnx2Bl zy5Myy+eqzxY31UF6SnvmGuXTLnueatm2d4OlUr3rNdzOYxAXo60QXkMxGJ/wnWPbKYt OLK8dnhUagxsPPw3pq76p5AWRpIfyno4EtZPgTGFMgYPyBIcOOugM6fb5C1u2P2Wv6If VfkC3mv7DUscSOffatBdKPn8vKyOAcJOl3lKLVg787h1haLf/XkSVVN0KAh3WPdKv99z mCfA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-language:content-transfer-encoding :in-reply-to:mime-version:user-agent:date:message-id:from:references :cc:to:subject:ironport-sdr:ironport-sdr; bh=zYQIBVGWsnVbO+Ry+gHllSurW/9Imv0Q6djoOSKALAo=; b=VBpxMfoGQjtUh4SBPx9as1flRJi8oYQ9LoMXG5wosNnAb+MKJegVN0frZCDVXQH3iw GLy2zT629MC//o1gjvkyi6Yl3B6nM58O5pZxLlI2fLFRW14Qlz1EZlfxOMi6GIMghwCE GjpdI7/HmK0SxfQIUo8D6NsGAMjJcjbtmJhYUwEiedah1ec/2XFX3EV0A1vpUgpq8FkR fv3PLNtZ119YzrvpLNoQJcvP+q0JG+A78FW5NKE0nQmPmGncU1HWlXo76IfqX9spdoW1 Mo/+4QDjVu0eEjFvmzqLvhU5hL6Xzf4IkjLhLSbbW1CoXd2O8Gt0BE4NxwygQcAeO2JW ChrA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id y16si4794835eda.286.2021.05.27.16.55.02; Thu, 27 May 2021 16:55:27 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236931AbhE0TEB (ORCPT + 99 others); Thu, 27 May 2021 15:04:01 -0400 Received: from mga18.intel.com ([134.134.136.126]:52731 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236934AbhE0TD1 (ORCPT ); Thu, 27 May 2021 15:03:27 -0400 IronPort-SDR: cVTjymvlmxZiFNZYIT6oaInAMzy3iohtx1p6wg2cfoVR8bcBLoxylOmsfEx2XWVX0cu8mBtlAo DvEvf3DnQbhg== X-IronPort-AV: E=McAfee;i="6200,9189,9997"; a="190183293" X-IronPort-AV: E=Sophos;i="5.83,228,1616482800"; d="scan'208";a="190183293" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 May 2021 12:01:24 -0700 IronPort-SDR: hIC7PXPO7MWKRMWUsJ4NNFkVDWx77kRMBHUjw5SdKspD43X+bDu5wBWg39NQQtWPtHJoAfykch UB+OX7CUvC6g== X-IronPort-AV: E=Sophos;i="5.83,228,1616482800"; d="scan'208";a="415021225" Received: from akleen-mobl1.amr.corp.intel.com (HELO [10.252.135.183]) ([10.252.135.183]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 May 2021 12:01:23 -0700 Subject: Re: [clocksource] 8901ecc231: stress-ng.lockbus.ops_per_sec -9.5% regression To: paulmck@kernel.org, Feng Tang Cc: kernel test robot , John Stultz , Thomas Gleixner , Stephen Boyd , Jonathan Corbet , Mark Rutland , Marc Zyngier , Xing Zhengjun , Chris Mason , LKML , Linux Memory Management List , lkp@lists.01.org, lkp@intel.com, ying.huang@intel.com, zhengjun.xing@intel.com References: <20210521083322.GG25531@xsang-OptiPlex-9020> <20210521135617.GT4441@paulmck-ThinkPad-P17-Gen-1> <20210522160827.GA2625834@paulmck-ThinkPad-P17-Gen-1> <20210526064922.GD5262@shbuild999.sh.intel.com> <20210526134911.GB4441@paulmck-ThinkPad-P17-Gen-1> <20210527182959.GA437082@paulmck-ThinkPad-P17-Gen-1> From: Andi Kleen Message-ID: <138f81df-08e1-f96e-1915-c58b44f96a41@linux.intel.com> Date: Thu, 27 May 2021 12:01:23 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 MIME-Version: 1.0 In-Reply-To: <20210527182959.GA437082@paulmck-ThinkPad-P17-Gen-1> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > Nevertheless, it is quite possible that real-world use will result in > some situation requiring that high-stress workloads run on hardware > not designed to accommodate them, and also requiring that the kernel > refrain from marking clocksources unstable. > > Therefore, provide an out-of-tree patch that reacts to this situation out-of-tree means it will not be submitted? I think it would make sense upstream, but perhaps guarded with some option.