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=-7.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 CFCD9C33CB2 for ; Fri, 31 Jan 2020 10:24:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A227C20707 for ; Fri, 31 Jan 2020 10:24:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728268AbgAaKYS (ORCPT ); Fri, 31 Jan 2020 05:24:18 -0500 Received: from lhrrgout.huawei.com ([185.176.76.210]:2335 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728071AbgAaKYS (ORCPT ); Fri, 31 Jan 2020 05:24:18 -0500 Received: from LHREML711-CAH.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id 80F9BF5241C2970A8448; Fri, 31 Jan 2020 10:24:15 +0000 (GMT) Received: from lhreml724-chm.china.huawei.com (10.201.108.75) by LHREML711-CAH.china.huawei.com (10.201.108.34) with Microsoft SMTP Server (TLS) id 14.3.408.0; Fri, 31 Jan 2020 10:24:15 +0000 Received: from [127.0.0.1] (10.202.226.43) by lhreml724-chm.china.huawei.com (10.201.108.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Fri, 31 Jan 2020 10:24:14 +0000 Subject: Re: [PATCH V5 0/6] blk-mq: improvement CPU hotplug To: Ming Lei CC: Ming Lei , Jens Axboe , linux-block , Bart Van Assche , "Hannes Reinecke" , Christoph Hellwig , Thomas Gleixner , Keith Busch , "chenxiang (M)" References: <20200115114409.28895-1-ming.lei@redhat.com> <929dbfac-de46-a947-6a2c-f4d8d504c631@huawei.com> <6dbe8c9f-af4e-3157-b6e9-6bbf43efb1e1@huawei.com> From: John Garry Message-ID: Date: Fri, 31 Jan 2020 10:24:13 +0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.1.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.202.226.43] X-ClientProxiedBy: lhreml735-chm.china.huawei.com (10.201.108.86) To lhreml724-chm.china.huawei.com (10.201.108.75) X-CFilter-Loop: Reflected Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org >> [ 141.976109] Call trace: >> [ 141.978550] __switch_to+0xbc/0x218 >> [ 141.982029] blk_mq_run_work_fn+0x1c/0x28 >> [ 141.986027] process_one_work+0x1e0/0x358 >> [ 141.990025] worker_thread+0x40/0x488 >> [ 141.993678] kthread+0x118/0x120 >> [ 141.996897] ret_from_fork+0x10/0x18 > > Hi John, > > Thanks for your test! > Hi Ming, > Could you test the following patchset and only the last one is changed? > > https://github.com/ming1/linux/commits/my_for_5.6_block For SCSI testing, I will ask my colleague Xiang Chen to test when he returns to work. So I did not see this issue for my SCSI testing for your original v5, but I was only using 1x as opposed to maybe 20x SAS disks. BTW, did you test NVMe? For some reason I could not trigger a scenario where we're draining the outstanding requests for a queue which is being deactivated - I mean, the queues were always already quiesced. Thanks, John