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 X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 D0BC1C47089 for ; Fri, 28 May 2021 00:58:59 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 61627613AF for ; Fri, 28 May 2021 00:58:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 61627613AF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E74566B0070; Thu, 27 May 2021 20:58:58 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id DFC0B6B0071; Thu, 27 May 2021 20:58:58 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C75756B0072; Thu, 27 May 2021 20:58:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0117.hostedemail.com [216.40.44.117]) by kanga.kvack.org (Postfix) with ESMTP id 913846B0070 for ; Thu, 27 May 2021 20:58:58 -0400 (EDT) Received: from smtpin37.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 3057E180279AF for ; Fri, 28 May 2021 00:58:58 +0000 (UTC) X-FDA: 78188830356.37.BA1FB17 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by imf01.hostedemail.com (Postfix) with ESMTP id 209CA503BD15 for ; Fri, 28 May 2021 00:58:47 +0000 (UTC) IronPort-SDR: RzIgZD6TLBdJxTfw5e6cR+mYkXdipMfnKAqrfi5HdmPFKjT1u39ca/qM69IvRAhXKK5TAv9Ylp Zh2PxPdbisWA== X-IronPort-AV: E=McAfee;i="6200,9189,9997"; a="202904456" X-IronPort-AV: E=Sophos;i="5.83,228,1616482800"; d="scan'208";a="202904456" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 May 2021 17:58:54 -0700 IronPort-SDR: izcikGdFV1LtOs5sI0F18rj7l/4fqxxuLlLpDvbMi4KFrDxpo7zWFQa6qg/K8Vw5qIW8Q7abjz sX7BWllJUXpA== X-IronPort-AV: E=Sophos;i="5.83,228,1616482800"; d="scan'208";a="548379223" Received: from akleen-mobl1.amr.corp.intel.com (HELO [10.252.135.183]) ([10.252.135.183]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 May 2021 17:58:53 -0700 Subject: Re: [clocksource] 8901ecc231: stress-ng.lockbus.ops_per_sec -9.5% regression To: paulmck@kernel.org, Matthew Wilcox Cc: Feng Tang , 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> <138f81df-08e1-f96e-1915-c58b44f96a41@linux.intel.com> <20210527191923.GD4397@paulmck-ThinkPad-P17-Gen-1> <20210527210524.GE4397@paulmck-ThinkPad-P17-Gen-1> From: Andi Kleen Message-ID: <7bda8e6a-2179-b431-973b-d074cd8d93db@linux.intel.com> Date: Thu, 27 May 2021 17:58:53 -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: <20210527210524.GE4397@paulmck-ThinkPad-P17-Gen-1> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Authentication-Results: imf01.hostedemail.com; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=intel.com (policy=none); spf=none (imf01.hostedemail.com: domain of ak@linux.intel.com has no SPF policy when checking 134.134.136.65) smtp.mailfrom=ak@linux.intel.com X-Stat-Signature: i4fmbajs9q8gj17i7t89pnjwhnkmhu4z X-Rspamd-Queue-Id: 209CA503BD15 X-Rspamd-Server: rspam02 X-HE-Tag: 1622163527-143065 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > Only those cloud provides making heavy use of the aforementioned "poorly > designed" hardware, correct? If any such hardware is deployed in non homeopathic quantities, we probably need to support it out of the box. So far I'm not seeing any evidence that it does not. That would argue for including the patch in the patch series. Especially since stress-ng is somewhat popular for system testing.