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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED 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 2ADD2C43441 for ; Wed, 28 Nov 2018 16:49:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E41882081B for ; Wed, 28 Nov 2018 16:49:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="e2pDqiEv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E41882081B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729031AbeK2DvX (ORCPT ); Wed, 28 Nov 2018 22:51:23 -0500 Received: from mail-lj1-f171.google.com ([209.85.208.171]:45639 "EHLO mail-lj1-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728141AbeK2DvX (ORCPT ); Wed, 28 Nov 2018 22:51:23 -0500 Received: by mail-lj1-f171.google.com with SMTP id s5-v6so24050600ljd.12 for ; Wed, 28 Nov 2018 08:49:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=KSdzNyrZlNLknvXmeCxFm5B+Uf7bGShovX12Q+EAsk4=; b=e2pDqiEvjGn1QB9LOZPjxu+3ikT3Oa4B7iL5UvxyJG3kAB+0lUF5SZ9podtul/jft8 XDKCP2HEtjSiu4lLX3kw4KaSLiPwgwQKhJlZiDbgougf+nTGYDSUotE9XSzr7nGqOrRe uq8ys2WtuBt6ReA7X0okyK3fCXtAnB8C35P34= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=KSdzNyrZlNLknvXmeCxFm5B+Uf7bGShovX12Q+EAsk4=; b=GIai/rr4JNSdtWaTTdMUG9FIhTP0Tf0YU3kqX18xzk+tplN00Tj1vMLqthOK6wG/VU yhJ/KsKOeAsYbslyoKP80VtSxLkvr7zcATnHd6QJY5AUeXjjjwqfSl30r/Ac+UpyibrM YlMM0b0Lm7Eb0BYcTJfGxasydWf1+es6KvVphj60HGRXUXFUoZU8dYfoaPRGfjPI8d// Q4w8U67Mq2m4jJVd50+CY9pbhyC0hQ03rN0gD9+CRl9ncU1rETawo4R2lfcMbNbdUX/n ue5fdDHrl27sN1GTtbdfwgcfd1DIqE2nMKzCEgh8ufaZYzk+nEAgLfCBIejIh5uJHiE0 KcrA== X-Gm-Message-State: AA+aEWZz+eWNYsPbBxwTSCy9NtR7XElM0H4V1tBJE9kPC9LQ193gnIaX YRAxyQ3lz8hx/sskalvKubR6MD3L4aw= X-Google-Smtp-Source: AFSGD/UZWkF33KLWjzZ8HpSs8HWeGips4F+eh8dO7M/9fQXzhsP3F/qqCTmDUm661ZmFdWsZZCXQCg== X-Received: by 2002:a2e:2e1a:: with SMTP id u26-v6mr25602442lju.8.1543423744295; Wed, 28 Nov 2018 08:49:04 -0800 (PST) Received: from mail-lf1-f42.google.com (mail-lf1-f42.google.com. [209.85.167.42]) by smtp.gmail.com with ESMTPSA id 11-v6sm1186272ljv.1.2018.11.28.08.49.02 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 28 Nov 2018 08:49:03 -0800 (PST) Received: by mail-lf1-f42.google.com with SMTP id u18so19867872lff.10 for ; Wed, 28 Nov 2018 08:49:02 -0800 (PST) X-Received: by 2002:a19:c014:: with SMTP id q20mr20753342lff.16.1543423742419; Wed, 28 Nov 2018 08:49:02 -0800 (PST) MIME-Version: 1.0 References: <20181127062503.GH6163@shao2-debian> <20181127205737.GI16136@redhat.com> <87tvk1yjkp.fsf@yhuang-dev.intel.com> In-Reply-To: <87tvk1yjkp.fsf@yhuang-dev.intel.com> From: Linus Torvalds Date: Wed, 28 Nov 2018 08:48:46 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [LKP] [mm] ac5b2c1891: vm-scalability.throughput -61.3% regression To: ying.huang@intel.com Cc: Andrea Arcangeli , Michal Hocko , s.priebe@profihost.ag, mgorman@techsingularity.net, Linux List Kernel Mailing , alex.williamson@redhat.com, lkp@01.org, rientjes@google.com, kirill@shutemov.name, Andrew Morton , zi.yan@cs.rutgers.edu, Vlastimil Babka Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Nov 27, 2018 at 7:20 PM Huang, Ying wrote: > > From the above data, for the parent commit 3 processes exited within > 14s, another 3 exited within 100s. For this commit, the first process > exited at 203s. That is, this commit makes memory allocation more fair > among processes, so that processes proceeded at more similar speed. But > this raises system memory footprint too, so triggered much more swap, > thus lower benchmark score. > > In general, memory allocation fairness among processes should be a good > thing. So I think the report should have been a "performance > improvement" instead of "performance regression". Hey, when you put it that way... Let's ignore this issue for now, and see if it shows up in some real workload and people complain. Linus