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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 D006EC32767 for ; Sat, 4 Jan 2020 09:10:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ABBF524653 for ; Sat, 4 Jan 2020 09:10:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726199AbgADJKB (ORCPT ); Sat, 4 Jan 2020 04:10:01 -0500 Received: from mail104.syd.optusnet.com.au ([211.29.132.246]:38930 "EHLO mail104.syd.optusnet.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726103AbgADJKB (ORCPT ); Sat, 4 Jan 2020 04:10:01 -0500 Received: from dread.disaster.area (pa49-180-68-255.pa.nsw.optusnet.com.au [49.180.68.255]) by mail104.syd.optusnet.com.au (Postfix) with ESMTPS id 9109143F45C; Sat, 4 Jan 2020 20:09:56 +1100 (AEDT) Received: from dave by dread.disaster.area with local (Exim 4.92.3) (envelope-from ) id 1infRT-0001jO-J9; Sat, 04 Jan 2020 20:09:55 +1100 Date: Sat, 4 Jan 2020 20:09:55 +1100 From: Dave Chinner To: Matthew Wilcox Cc: lsf-pc@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [LSF/MM TOPIC] Congestion Message-ID: <20200104090955.GF23195@dread.disaster.area> References: <20191231125908.GD6788@bombadil.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191231125908.GD6788@bombadil.infradead.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.3 cv=W5xGqiek c=1 sm=1 tr=0 a=sbdTpStuSq8iNQE8viVliQ==:117 a=sbdTpStuSq8iNQE8viVliQ==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=kj9zAlcOel0A:10 a=Jdjhy38mL1oA:10 a=VwQbUJbxAAAA:8 a=JfrnYn6hAAAA:8 a=7-415B0cAAAA:8 a=yCk7sgB39VCk9DmHSNQA:9 a=CjuIK1q_8ugA:10 a=AjGcO6oz07-iQ99wixmX:22 a=1CNFftbPRP8L7MoqJWF3:22 a=biEYGPWJfzWAr4FL6Ov7:22 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Tue, Dec 31, 2019 at 04:59:08AM -0800, Matthew Wilcox wrote: > > I don't want to present this topic; I merely noticed the problem. > I nominate Jens Axboe and Michael Hocko as session leaders. See the > thread here: > > https://lore.kernel.org/linux-mm/20190923111900.GH15392@bombadil.infradead.org/ > > Summary: Congestion is broken and has been for years, and everybody's > system is sleeping waiting for congestion that will never clear. Another symptom: system does not sleep because there is no recorded congestion so it doesn't back off when it should (the wait_iff_congested() backoff case). Cheers, Dave. -- Dave Chinner david@fromorbit.com