From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752677AbdKIK0S (ORCPT ); Thu, 9 Nov 2017 05:26:18 -0500 Received: from mx2.suse.de ([195.135.220.15]:38169 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750945AbdKIK0Q (ORCPT ); Thu, 9 Nov 2017 05:26:16 -0500 Date: Thu, 9 Nov 2017 11:26:13 +0100 From: Michal Hocko To: Tetsuo Handa Cc: rostedt@goodmis.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, xiyou.wangcong@gmail.com, dave.hansen@intel.com, hannes@cmpxchg.org, mgorman@suse.de, pmladek@suse.com, sergey.senozhatsky@gmail.com, vbabka@suse.cz, peterz@infradead.org, torvalds@linux-foundation.org, jack@suse.cz, mathieu.desnoyers@efficios.com, rostedt@rostedt.homelinux.com Subject: Re: [PATCH v4] printk: Add console owner and waiter logic to loadbalance console writes Message-ID: <20171109102613.hp6waybyxbkb3crz@dhcp22.suse.cz> References: <20171108102723.602216b1@gandalf.local.home> <20171109101138.qmy3366myzjafexr@dhcp22.suse.cz> <201711091922.IHJ81787.OVQFFJOSOLtHMF@I-love.SAKURA.ne.jp> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <201711091922.IHJ81787.OVQFFJOSOLtHMF@I-love.SAKURA.ne.jp> User-Agent: NeoMutt/20170609 (1.8.3) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu 09-11-17 19:22:58, Tetsuo Handa wrote: > Michal Hocko wrote: > > Hi, > > assuming that this passes warn stall torturing by Tetsuo, do you think > > we can drop http://lkml.kernel.org/r/1509017339-4802-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp > > from the mmotm tree? > > I don't think so. > > The rule that "do not try to printk() faster than the kernel can write to > consoles" will remain no matter how printk() changes. Unless asynchronous > approach like https://lwn.net/Articles/723447/ is used, I think we can't > obtain useful information. Does that mean that the patch doesn't pass your test? -- Michal Hocko SUSE Labs