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=-8.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_PASS autolearn=unavailable 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 151F0C43612 for ; Wed, 2 Jan 2019 16:54:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D8C89218A4 for ; Wed, 2 Jan 2019 16:54:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="RqbKQ7nP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730517AbfABQya (ORCPT ); Wed, 2 Jan 2019 11:54:30 -0500 Received: from aserp2130.oracle.com ([141.146.126.79]:60068 "EHLO aserp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728720AbfABQy3 (ORCPT ); Wed, 2 Jan 2019 11:54:29 -0500 Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.22/8.16.0.22) with SMTP id x02GmvBI070945; Wed, 2 Jan 2019 16:54:13 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=subject : to : cc : references : from : message-id : date : mime-version : in-reply-to : content-type : content-transfer-encoding; s=corp-2018-07-02; bh=/ypah8wJvDvd6wm0z/IV+9XsHXGEoTAmaF/xx1029j0=; b=RqbKQ7nP7SR2gqW45H8h8O5NFSXMm1za9oezSnCLbEev8WzmcwHAWt3torTggun6XVH7 6tpJ778QG2C07aes9iHSFpAy20kFuZaY7hEe2r8JqTUmOl3w7bqzSgb3wZu1wrFMqqeg lWBUa5YAiR5uRYMy7VXbJBILp8UzR7O+nhGTjvjOU6vaZiF5TmTbL57pNOcgG5LTSPKU ZwOYqlkOgpwezkjkoF7E3Njb9fA3AWSXIOK7HSsXn16+m2fiKMyM2eDUPGNifdWPV/iN vPbGP09e5EQ/aNtuLuypERyEHXb/IkVRk/r5IjTRoHDgNnfltkT8kbi5EAbBfTwf2P7U +Q== Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by aserp2130.oracle.com with ESMTP id 2pnxee35qv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 02 Jan 2019 16:54:13 +0000 Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id x02GsBWP006289 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Jan 2019 16:54:11 GMT Received: from abhmp0010.oracle.com (abhmp0010.oracle.com [141.146.116.16]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x02Gs9Ki026431; Wed, 2 Jan 2019 16:54:09 GMT Received: from [192.168.1.164] (/50.38.38.67) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 02 Jan 2019 08:54:09 -0800 Subject: Re: [LKP] [hugetlbfs] 9c83282117: vm-scalability.throughput -4.3% regression To: kernel test robot Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Michal Hocko , Hugh Dickins , Naoya Horiguchi , "Aneesh Kumar K . V" , Andrea Arcangeli , "Kirill A . Shutemov" , Davidlohr Bueso , Prakash Sangappa , Andrew Morton , stable@vger.kernel.org, lkp@01.org References: <20181228142608.GA17624@shao2-debian> From: Mike Kravetz Message-ID: <21117eab-862e-562b-0c86-ec2ccc1f68e4@oracle.com> Date: Wed, 2 Jan 2019 08:54:07 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <20181228142608.GA17624@shao2-debian> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9124 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=917 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1901020151 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/28/18 6:26 AM, kernel test robot wrote: > Greeting, > > FYI, we noticed a -4.3% regression of vm-scalability.throughput due to commit: > > > commit: 9c83282117778856d647ffc461c4aede2abb6742 ("[PATCH v3 1/2] hugetlbfs: use i_mmap_rwsem for more pmd sharing synchronization") > url: https://github.com/0day-ci/linux/commits/Mike-Kravetz/hugetlbfs-use-i_mmap_rwsem-for-better-synchronization/20181223-095226 > > > in testcase: vm-scalability > on test machine: 104 threads Intel(R) Xeon(R) Platinum 8170 CPU @ 2.10GHz with 64G memory > with following parameters: > > runtime: 300s > size: 8T > test: anon-cow-seq-hugetlb > cpufreq_governor: performance > ucode: 0x200004d I'll take a closer look. The patch does introduce longer i_mmap_rwsem hold times for the sake of correctness. Need to more fully understand the test and results to determine if this is expected. -- Mike Kravetz