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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 4B8FAC433E0 for ; Sun, 5 Jul 2020 12:15:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 29FCC20724 for ; Sun, 5 Jul 2020 12:15:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lca.pw header.i=@lca.pw header.b="jmu3wSIH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726906AbgGEMPH (ORCPT ); Sun, 5 Jul 2020 08:15:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726692AbgGEMPH (ORCPT ); Sun, 5 Jul 2020 08:15:07 -0400 Received: from mail-qk1-x742.google.com (mail-qk1-x742.google.com [IPv6:2607:f8b0:4864:20::742]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CC8ACC061794 for ; Sun, 5 Jul 2020 05:15:06 -0700 (PDT) Received: by mail-qk1-x742.google.com with SMTP id j80so32516849qke.0 for ; Sun, 05 Jul 2020 05:15:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lca.pw; s=google; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=NeeC3BoKw9HtpTq+ErElyvyWue7It9U6wNs4zBp3mYg=; b=jmu3wSIHJp3Wh+uXtKDaQe03zcCuhSCj9u2xsXl+awOyc4qL7l27wQFCJDjBG0ud2M z7/wYmik9tYcpR0FQ8vD+SQWCecLj3Ygz0jImAV/LqWJCab/Dan+3/70WEsourVpRnOF G+RO13T2q4yxdETNMJtYbWUNrnMTFGWIL9KfjtHxI1aYkKoohjDcyu2KJpdOOzRM2ZBP /i0A2hu84HhT9jtU+/ipOLxj6r/siHjCbJAIOzoPSriuq0oviw9NHz+X3zBTydCPwxCp L+kUlZSkfU71NEidNsA2+I+mzH5Jc5bt8Hu9LZiasauqzoWg8pBcm7uGWdVi+ahI1/1p QJnw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=NeeC3BoKw9HtpTq+ErElyvyWue7It9U6wNs4zBp3mYg=; b=E7pGj2Gnrx2oV4Dnu6kHtk45ctic6ZH53Ym7s80oqA3EhTPEhgKW6t8o4pH3C8fmyS ovdIPQiWJ4KhVw8WqK+LjAK+DFNAhs8YUGlPT1ZvKpdQ4RhKeAtzuH+utktlWTgleO/r G0H+GqFrU04hkrF9Dz/ylNNSlSmc2bmjbqibEG5hBz10zFntX93nVkMDlEJEvpAvid4O WSrfw89yuMmfZCQHmDZ/qBG2JilkBSr5K0h3IzP82ijtNtRW/HYL15w71Fccs6uq6gN2 KV/C3qoEjomj/LHWX6Znal0xnvpvmPK13h5qKmfV8HkyQ2Y8xbc7jMC9mBE8fXMTsX/E jung== X-Gm-Message-State: AOAM531Maaat+Vz5+N5Jc8xmVcY4ieMOwsao5jUF0lvXdWgy8RJ1UsT1 wdQo9FGVduGkuHsAYk8Pjp2PUb2HeQuWag== X-Google-Smtp-Source: ABdhPJwnCItzWm07jx6a0u/P4LRFpyoPar9X+my51ckRR3JgOZCzNSkpYlL6jdAiJdAtVb4NH3p5/A== X-Received: by 2002:a37:b041:: with SMTP id z62mr26042069qke.448.1593951305098; Sun, 05 Jul 2020 05:15:05 -0700 (PDT) Received: from [192.168.1.183] (pool-71-184-117-43.bstnma.fios.verizon.net. [71.184.117.43]) by smtp.gmail.com with ESMTPSA id y67sm12708546qka.101.2020.07.05.05.15.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 05 Jul 2020 05:15:04 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable From: Qian Cai Mime-Version: 1.0 (1.0) Subject: Re: [mm] 4e2c82a409: ltp.overcommit_memory01.fail Date: Sun, 5 Jul 2020 08:15:03 -0400 Message-Id: References: <20200705044454.GA90533@shbuild999.sh.intel.com> Cc: kernel test robot , Andrew Morton , Michal Hocko , Johannes Weiner , Matthew Wilcox , Mel Gorman , Kees Cook , Luis Chamberlain , Iurii Zaikin , andi.kleen@intel.com, tim.c.chen@intel.com, dave.hansen@intel.com, ying.huang@intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, lkp@lists.01.org In-Reply-To: <20200705044454.GA90533@shbuild999.sh.intel.com> To: Feng Tang X-Mailer: iPhone Mail (17F80) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Jul 5, 2020, at 12:45 AM, Feng Tang wrote: >=20 > I did reproduce the problem, and from the debugging, this should > be the same root cause as lore.kernel.org/lkml/20200526181459.GD991@lca.pw= / > that loosing the batch cause some accuracy problem, and the solution of > adding some sync is still needed, which is dicussed in Well, before taking any of those patches now to fix the regression, we will n= eed some performance data first. If it turned out the original performance g= ain is no longer relevant anymore due to this regression fix on top, it is b= est to drop this patchset and restore that VM_WARN_ONCE, so you can retry la= ter once you found a better way to optimize.=