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=-9.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 C7933C433E0 for ; Mon, 4 Jan 2021 01:25:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 91E682080D for ; Mon, 4 Jan 2021 01:25:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727156AbhADBZA (ORCPT ); Sun, 3 Jan 2021 20:25:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51238 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726026AbhADBZA (ORCPT ); Sun, 3 Jan 2021 20:25:00 -0500 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C5353C061574 for ; Sun, 3 Jan 2021 17:24:19 -0800 (PST) Received: by mail-pl1-x62b.google.com with SMTP id g3so13585962plp.2 for ; Sun, 03 Jan 2021 17:24:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=ReCyuB6iT6jEYrceFC7R53dNfUpjsZRHDJqV6HxAgxg=; b=QFupxU8pLGaGgSleLM/HvnYu/truly/dP2d8owcgD6JNHlG90yHOaC6VGAqZ9uBvgT coW3EWJtGLDs8ERGbtiWavXbxPR5jSWpYCPjMarlavq5RiOXx+cPhlylltZqqV/wNs9Z 2HZdCNfOrj0VUZLV59OR8SZFEjkB+zQPYVCr7pp2ltBOApWxiSjW0cB2FzkQqLX3cXAO CqwF/j2NPHHhJ2fMMfodf64jlUPtujMkhjt0YObGipgMC9HedvlvL1zlqx9PhjVCAT3y w6yjRcISTaNwXjxG/RI/4sTh2DhIBCgB+HaNAO+kpOKlf+kjvMaGgmEKf5z130CX9VXZ GaOQ== 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=ReCyuB6iT6jEYrceFC7R53dNfUpjsZRHDJqV6HxAgxg=; b=ck+sgW/y5qJtWH7D/SyCbtbPF5dapRc1aDJXnwZsnqI6rv9He1kYaToFKIj0UAT2oX n5VN8YoKrSSpRxDVe+ZBRmse4XaxoaNPxChH+UOmf6Cgf6qI+YY6nwVSG+KXqTaOU9yJ wKhys4CagJ/+GtXU3JCdi58foINP2gBCia2p+V2GNANN9QeFNB0MxDkL//YqEZt1npT3 xh0yQPOa6IVhcZV+HD1q2yGxbrn+FOmaE/FTx0sL0A0ORFUUsdNpltx+C6BRYA8T7hGi ue4grD+aeG2TII0/X8i40nK+8n3/FjAlFFH5pI89rJ3LxxDfe635HHFmcwV4oO6NkazH sXKA== X-Gm-Message-State: AOAM533ETVb5+vWt0SnQUS4pL8vyfV2bJQ7SOnlZwiE5MSB8IZY3jbWB uPUYIme4SRZyx4kNWDRuI1IW8I1TCOsYAw== X-Google-Smtp-Source: ABdhPJyAQg451uM4KB2/JZAHzGWxSCbqFO7QyDWp1DEKwRwQfM4P28BEkyaMMH9xJxj19wfgdnDs9Q== X-Received: by 2002:a17:902:7d88:b029:db:7aa4:864c with SMTP id a8-20020a1709027d88b02900db7aa4864cmr47955011plm.34.1609723458988; Sun, 03 Jan 2021 17:24:18 -0800 (PST) Received: from js1304-desktop ([114.206.198.176]) by smtp.gmail.com with ESMTPSA id o14sm55101680pgr.44.2021.01.03.17.24.14 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 03 Jan 2021 17:24:18 -0800 (PST) Date: Mon, 4 Jan 2021 10:24:10 +0900 From: Joonsoo Kim To: kernel test robot Cc: Linus Torvalds , Andrew Morton , Johannes Weiner , Vlastimil Babka , Hugh Dickins , Matthew Wilcox , Mel Gorman , Michal Hocko , Minchan Kim , LKML , lkp@lists.01.org, lkp@intel.com, ying.huang@intel.com, feng.tang@intel.com, zhengjun.xing@intel.com Subject: Re: [mm/swap] aae466b005: vm-scalability.throughput -2.7% regression Message-ID: <20210104012356.GA5941@js1304-desktop> References: <20201230062412.GD22185@xsang-OptiPlex-9020> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201230062412.GD22185@xsang-OptiPlex-9020> User-Agent: Mutt/1.5.24 (2015-08-30) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 30, 2020 at 02:24:12PM +0800, kernel test robot wrote: > > Greeting, > > FYI, we noticed a -2.7% regression of vm-scalability.throughput due to commit: > > > commit: aae466b0052e1888edd1d7f473d4310d64936196 ("mm/swap: implement workingset detection for anonymous LRU") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master Hello, Thanks for reporting. This is a known issue to me. As you can see below, slight regression is found on only the random access workload. For pure random pattern, detecting workingset would not guarantee a good result since these pages doesn't accessed in the near future. Even worse, it causes small overhead to the system since we need to demote these activated page to the inactive list to reclaim. So, below result is natural to me. For other access pattern, this patchset would result in positive effect. Thanks.