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 F0199C04EB9 for ; Mon, 3 Dec 2018 18:01:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B8CBD208A3 for ; Mon, 3 Dec 2018 18:01:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="dH8bwQQD" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B8CBD208A3 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 S1726893AbeLCSBp (ORCPT ); Mon, 3 Dec 2018 13:01:45 -0500 Received: from mail-lj1-f196.google.com ([209.85.208.196]:42732 "EHLO mail-lj1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726221AbeLCSBp (ORCPT ); Mon, 3 Dec 2018 13:01:45 -0500 Received: by mail-lj1-f196.google.com with SMTP id l15-v6so12268856lja.9 for ; Mon, 03 Dec 2018 10:01:38 -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=UMequlaPSMDEgDTya61QUmB0BDWe2wvEog3UPGT3UYk=; b=dH8bwQQDYZ8mx2VRAevfyyZNwuF6EwrmvEUszH4nt4yl3ixUo7vonLtiUPKFdeju1x /hhmVCaJOecoL7MaZspW8UuoeR9jxLznh/eJsYKXrdXVWnbaLzc8N/j/1hnwirjphjkL Xn5IFIBYnLFWEyvRvkGFnjRYUrL8IEjX7YPKc= 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=UMequlaPSMDEgDTya61QUmB0BDWe2wvEog3UPGT3UYk=; b=qdeNBCngWfoY97sahMD6RxC6dORuV49ZcMVn+kRZkc0wTUD/x0M7nPpcPvGJQCvGGt 7ObbFZdCG0bJ4pD+pTINvdHzFbzVo1B5mC9oFeLxcbK//gdlQDbvpgaKzFXK9fg1bbiT 1c+hrCdPZiWDbseHRdFB39pH2svQ4TlRsgHnR11dCjHWytOSca4dIdit6S8yWZ4b7UXf EwaNycJ8ub/d//XpiY7hGksLuF4PjajCKbU7CnbKNqjmkmMLqxBlhRnTqdriyJQPhJcJ ToeL7AhQWe5H0ThHEVDOzda9WxuDx/oNkXK6uzmLJXCXw2bNBoq9foSnGSJcIyi3oZL+ wfnA== X-Gm-Message-State: AA+aEWatpbDLXK8oWBxXB600yhdS9FUuc/AjGksys/9XjyrTKQPT5qsU z7YoYLMh/AbWMaffMUZUReiZSgCxG/E= X-Google-Smtp-Source: AFSGD/UUciMUnmmtNo2cAdD9SQZE+0gWMgOL/XjP4VeSrQMTRKIaQXSrYxhFofBu9m0fRtxAh9zE+Q== X-Received: by 2002:a2e:868c:: with SMTP id l12-v6mr11888725lji.90.1543860096735; Mon, 03 Dec 2018 10:01:36 -0800 (PST) Received: from mail-lj1-f181.google.com (mail-lj1-f181.google.com. [209.85.208.181]) by smtp.gmail.com with ESMTPSA id 11-v6sm2566274ljv.1.2018.12.03.10.01.35 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 03 Dec 2018 10:01:35 -0800 (PST) Received: by mail-lj1-f181.google.com with SMTP id v15-v6so12249380ljh.13 for ; Mon, 03 Dec 2018 10:01:35 -0800 (PST) X-Received: by 2002:a2e:3e04:: with SMTP id l4-v6mr10301151lja.148.1543860094870; Mon, 03 Dec 2018 10:01:34 -0800 (PST) MIME-Version: 1.0 References: <20181127062503.GH6163@shao2-debian> <20181127205737.GI16136@redhat.com> <87tvk1yjkp.fsf@yhuang-dev.intel.com> In-Reply-To: From: Linus Torvalds Date: Mon, 3 Dec 2018 10:01:18 -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 Wed, Nov 28, 2018 at 8:48 AM Linus Torvalds wrote: > > On Tue, Nov 27, 2018 at 7:20 PM Huang, Ying wrote: > > > > 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. Well, David Rientjes points out that it *does* cause real problems in real workloads, so it's not just this benchmark run that shows the issue. So I guess we should revert, or at least fix. David, please post your numbers again in public along with your suggested solution... Linus