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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 6A374C433E7 for ; Mon, 12 Oct 2020 08:18:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 308BE208FE for ; Mon, 12 Oct 2020 08:18:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726882AbgJLISa (ORCPT ); Mon, 12 Oct 2020 04:18:30 -0400 Received: from outbound-smtp24.blacknight.com ([81.17.249.192]:45353 "EHLO outbound-smtp24.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726098AbgJLIS3 (ORCPT ); Mon, 12 Oct 2020 04:18:29 -0400 Received: from mail.blacknight.com (pemlinmail03.blacknight.ie [81.17.254.16]) by outbound-smtp24.blacknight.com (Postfix) with ESMTPS id 2D879C102E for ; Mon, 12 Oct 2020 09:18:28 +0100 (IST) Received: (qmail 30399 invoked from network); 12 Oct 2020 08:18:28 -0000 Received: from unknown (HELO techsingularity.net) (mgorman@techsingularity.net@[84.203.22.4]) by 81.17.254.9 with ESMTPSA (AES256-SHA encrypted, authenticated); 12 Oct 2020 08:18:27 -0000 Date: Mon, 12 Oct 2020 09:18:25 +0100 From: Mel Gorman To: Xing Zhengjun Cc: kernel test robot , Linus Torvalds , Maxim Levitsky , LKML , lkp@lists.01.org Subject: Re: [LKP] [fs] b6509f6a8c: will-it-scale.per_thread_ops -12.6% regression Message-ID: <20201012081825.GR3227@techsingularity.net> References: <20200706012029.GZ3874@shao2-debian> <6b301f34-f8fe-c626-e5e5-9af5c257c5c3@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <6b301f34-f8fe-c626-e5e5-9af5c257c5c3@linux.intel.com> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 12, 2020 at 02:20:26PM +0800, Xing Zhengjun wrote: > Hi Mel, > > It is a revert commit caused the regression, Do you have a plan to fix > it? Thanks. I re-test it in v5.9-rc8, the regression still existed. > The revert caused a *performance* regression but the original performance gain caused a functional failure. The overall performance should be unchanged. I have not revisited the topic since. -- Mel Gorman SUSE Labs