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 65F13C433E1 for ; Wed, 26 Aug 2020 13:26:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 46B2C214F1 for ; Wed, 26 Aug 2020 13:26:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729504AbgHZN00 (ORCPT ); Wed, 26 Aug 2020 09:26:26 -0400 Received: from mx2.suse.de ([195.135.220.15]:48106 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728625AbgHZN0W (ORCPT ); Wed, 26 Aug 2020 09:26:22 -0400 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> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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