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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_PASS 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 6D7D5C43381 for ; Mon, 11 Mar 2019 18:37:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 45CDE20657 for ; Mon, 11 Mar 2019 18:37:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="ltUR5DiU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727660AbfCKShM (ORCPT ); Mon, 11 Mar 2019 14:37:12 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:57260 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726942AbfCKShM (ORCPT ); Mon, 11 Mar 2019 14:37:12 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x2BIZRnK001556; Mon, 11 Mar 2019 18:36:45 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=E6N2IZVxQoXC5LCpGTchj/NDu3ubkGKz33Um+0XHDmk=; b=ltUR5DiUjJC4KzgmNNkqSJxIu3NBCy0LQeOOpk3PC/5Bl7Xs6zJOqXDUlFBfaLsHvsp0 uCNSEtwG8ul4KkymcJwedvS7x7DjmARyZgzlDoqoZpBTOvC0+0VnGACcE++N02h9ffpA IV/CMdyfFRrEw/Me8YCTztAZqw0xTxQCQoSKCeCCI1C2DvWDbXMEptOZRFO7+6P0GVFJ NYektzun6NOplrMHfxTeGw046A10cbPY6yPklrnNrOjff06fx+/RAYk6k5/GT3b6Jker BzhApLLyp24tUsj0QRbO09UdL6/KKoAxqW0fpGyhT0YLB5v7nF0MSXMRGpVNZLTs84i7 3w== Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp2130.oracle.com with ESMTP id 2r44wu09c3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 11 Mar 2019 18:36:44 +0000 Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id x2BIacmi015780 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 11 Mar 2019 18:36:38 GMT Received: from abhmp0009.oracle.com (abhmp0009.oracle.com [141.146.116.15]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x2BIac2N021935; Mon, 11 Mar 2019 18:36:38 GMT Received: from [10.132.91.175] (/10.132.91.175) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 11 Mar 2019 11:36:38 -0700 Subject: Re: [RFC][PATCH 00/16] sched: Core scheduling To: Aubrey Li Cc: Mel Gorman , Peter Zijlstra , Ingo Molnar , Thomas Gleixner , Paul Turner , Tim Chen , Linux List Kernel Mailing , Linus Torvalds , Fr?d?ric Weisbecker , Kees Cook , Greg Kerr References: <20190218165620.383905466@infradead.org> <20190222124544.GY9565@techsingularity.net> <14a9adf7-9b50-1dfa-0c35-d04e976081c2@oracle.com> From: Subhra Mazumdar Message-ID: <19d5d492-a4c1-b3c8-cae4-da2fdfcb872b@oracle.com> Date: Mon, 11 Mar 2019 11:34:04 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9192 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1903110130 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/10/19 9:23 PM, Aubrey Li wrote: > On Sat, Mar 9, 2019 at 3:50 AM Subhra Mazumdar > wrote: >> expected. Most of the performance recovery happens in patch 15 which, >> unfortunately, is also the one that introduces the hard lockup. >> > After applied Subhra's patch, the following is triggered by enabling > core sched when a cgroup is > under heavy load. > It seems you are facing some other deadlock where printk is involved. Can you drop the last patch (patch 16 sched: Debug bits...) and try? Thanks, Subhra