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=-7.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_SANE_1 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 8C2C1C433E1 for ; Wed, 26 Aug 2020 13:48:26 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3B66B2177B for ; Wed, 26 Aug 2020 13:48:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3B66B2177B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 997426B0006; Wed, 26 Aug 2020 09:48:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 9485C6B0007; Wed, 26 Aug 2020 09:48:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8362B6B0008; Wed, 26 Aug 2020 09:48:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0053.hostedemail.com [216.40.44.53]) by kanga.kvack.org (Postfix) with ESMTP id 6BD956B0006 for ; Wed, 26 Aug 2020 09:48:25 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 247AC364A for ; Wed, 26 Aug 2020 13:48:25 +0000 (UTC) X-FDA: 77192849370.08.uncle49_4b00d0427064 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin08.hostedemail.com (Postfix) with ESMTP id C31641819E766 for ; Wed, 26 Aug 2020 13:48:21 +0000 (UTC) X-HE-Tag: uncle49_4b00d0427064 X-Filterd-Recvd-Size: 2303 Received: from out4436.biz.mail.alibaba.com (out4436.biz.mail.alibaba.com [47.88.44.36]) by imf32.hostedemail.com (Postfix) with ESMTP for ; Wed, 26 Aug 2020 13:48:20 +0000 (UTC) X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R111e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01f04397;MF=xlpang@linux.alibaba.com;NM=1;PH=DS;RN=6;SR=0;TI=SMTPD_---0U6wCMsX_1598449687; Received: from xunleideMacBook-Pro.local(mailfrom:xlpang@linux.alibaba.com fp:SMTPD_---0U6wCMsX_1598449687) by smtp.aliyun-inc.com(127.0.0.1); Wed, 26 Aug 2020 21:48:07 +0800 Reply-To: xlpang@linux.alibaba.com Subject: Re: [PATCH] mm: memcg: Fix memcg reclaim soft lockup To: Michal Hocko Cc: Johannes Weiner , Andrew Morton , Vladimir Davydov , linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <1598426822-93737-1-git-send-email-xlpang@linux.alibaba.com> <20200826081102.GM22869@dhcp22.suse.cz> <99efed0e-050a-e313-46ab-8fe6228839d5@linux.alibaba.com> <20200826110015.GO22869@dhcp22.suse.cz> <20200826120740.GP22869@dhcp22.suse.cz> <19eb48db-7d5e-0f55-5dfc-6a71274fd896@linux.alibaba.com> <20200826124810.GQ22869@dhcp22.suse.cz> <061e8600-e162-6ac9-2f4f-bf161435a5b2@linux.alibaba.com> <20200826132620.GR22869@dhcp22.suse.cz> From: xunlei Message-ID: Date: Wed, 26 Aug 2020 21:48:06 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <20200826132620.GR22869@dhcp22.suse.cz> Content-Type: text/plain; charset=gbk X-Rspamd-Queue-Id: C31641819E766 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000015, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2020/8/26 =CF=C2=CE=E79:26, Michal Hocko wrote: > On Wed 26-08-20 21:16:28, xunlei wrote: > [...] >> oom_reaper also can't get scheduled because of 1-cpu, and the mutex >> uses might_sleep() which is noop in case of "CONFIG_PREEMPT_VOLUNTARY = is >> not set" I mentioned in the commit log. >=20 > OK, I see. I have clearly missed the 1cpu configuration. Sorry about > that. >=20 > Thanks for bearing with me. >=20 Thanks for the confirmation, has sent v2.