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=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 05C30C04ABB for ; Tue, 11 Sep 2018 14:22:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1BB3220839 for ; Tue, 11 Sep 2018 14:22:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="VbII7OUs" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1BB3220839 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com 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 S1727711AbeIKTWA (ORCPT ); Tue, 11 Sep 2018 15:22:00 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:48962 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726761AbeIKTWA (ORCPT ); Tue, 11 Sep 2018 15:22:00 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.22/8.16.0.22) with SMTP id w8BEJQaE134884; Tue, 11 Sep 2018 14:22:23 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=CKWyAbFc8M7uowMRSNOPyYR5frAzP4Z20kDs5JGd4A0=; b=VbII7OUsTJKIrA5+6n8wBe7+xyrSPtTbgahz7dOZbdJbHH5QUCnilk2NMn/4zFqwu2eu VKicoI/DN/orwSF2ZAuIv/UOarGjufahULVVHWh4bSjBZ8XqNoJnzVmGtN7VyaSM1SYD o2ds+mF71binnk4gEVQArJ+w+K4DrLDlaKw3Eu+zeGADHiCUbva385bHHBAii8gS64gs UaTMh7YEYATPwnY3MnBv4CzQCGoFKiAwjonevMc1nEj5CMDYX3UwcZs66qQfvSBS6ZWB /+67KikV7p31z7+8jGhoYfdOb2G5RdOiareWYoXYuWaWHckRsdb4Vf1+VAiLvrS2jkSR Fw== Received: from userv0022.oracle.com (userv0022.oracle.com [156.151.31.74]) by userp2130.oracle.com with ESMTP id 2mc5utckqv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 11 Sep 2018 14:22:23 +0000 Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userv0022.oracle.com (8.14.4/8.14.4) with ESMTP id w8BEMMPB017241 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 11 Sep 2018 14:22:23 GMT Received: from abhmp0019.oracle.com (abhmp0019.oracle.com [141.146.116.25]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id w8BEMMkS004761; Tue, 11 Sep 2018 14:22:22 GMT Received: from [10.191.3.83] (/10.191.3.83) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 11 Sep 2018 07:22:22 -0700 Subject: Re: [PATCH] percpu-refcount: relax limit on percpu_ref_reinit() To: Ming Lei Cc: linux-kernel@vger.kernel.org, Tejun Heo , Kent Overstreet , linux-block@vger.kernel.org References: <20180909125824.9150-1-ming.lei@redhat.com> <20180910161135.GA27430@ming.t460p> <20180911040323.GC30977@ming.t460p> <771fa1eb-85d3-2ff2-6070-207874da85b6@oracle.com> <20180911082023.GA5360@ming.t460p> From: "jianchao.wang" Message-ID: <096be5c0-a69f-4553-5507-5fcdecc1ea20@oracle.com> Date: Tue, 11 Sep 2018 22:22:22 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180911082023.GA5360@ming.t460p> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9012 signatures=668708 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=630 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1809110147 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Ming On 09/11/2018 04:20 PM, Ming Lei wrote: > We only check the 'whole counting' at atomic mode, so it is the atomic > part('ref->count'), please see percpu_ref_put_many(), in which ref->release() > is only called at atomic mode. > > At percpu mode, the ref-count is only decreased/increased on the local CPU. Yes, I got it. Thanks for your kindly response. Sincerely Jianchao