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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 60B53C433DF for ; Wed, 26 Aug 2020 13:26:24 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 30E76214F1 for ; Wed, 26 Aug 2020 13:26:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 30E76214F1 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 9A0CD6B0003; Wed, 26 Aug 2020 09:26:23 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 928846B0005; Wed, 26 Aug 2020 09:26:23 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 83F3D6B0006; Wed, 26 Aug 2020 09:26:23 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0043.hostedemail.com [216.40.44.43]) by kanga.kvack.org (Postfix) with ESMTP id 6F6446B0003 for ; Wed, 26 Aug 2020 09:26:23 -0400 (EDT) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 3690E181AEF09 for ; Wed, 26 Aug 2020 13:26:23 +0000 (UTC) X-FDA: 77192793846.13.verse57_5d16c4f27064 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin13.hostedemail.com (Postfix) with ESMTP id E8CED18140B69 for ; Wed, 26 Aug 2020 13:26:22 +0000 (UTC) X-HE-Tag: verse57_5d16c4f27064 X-Filterd-Recvd-Size: 1812 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf05.hostedemail.com (Postfix) with ESMTP for ; Wed, 26 Aug 2020 13:26:22 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id D9535AED6; Wed, 26 Aug 2020 13:26:52 +0000 (UTC) Date: Wed, 26 Aug 2020 15:26:20 +0200 From: Michal Hocko To: xunlei Cc: Johannes Weiner , Andrew Morton , Vladimir Davydov , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH] mm: memcg: Fix memcg reclaim soft lockup Message-ID: <20200826132620.GR22869@dhcp22.suse.cz> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <061e8600-e162-6ac9-2f4f-bf161435a5b2@linux.alibaba.com> X-Rspamd-Queue-Id: E8CED18140B69 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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. OK, I see. I have clearly missed the 1cpu configuration. Sorry about that. Thanks for bearing with me. -- Michal Hocko SUSE Labs