From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f69.google.com (mail-wm0-f69.google.com [74.125.82.69]) by kanga.kvack.org (Postfix) with ESMTP id 8C99A440CD7 for ; Thu, 9 Nov 2017 05:26:17 -0500 (EST) Received: by mail-wm0-f69.google.com with SMTP id b189so3732976wmd.9 for ; Thu, 09 Nov 2017 02:26:17 -0800 (PST) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id b18si5092731edh.47.2017.11.09.02.26.16 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 09 Nov 2017 02:26:16 -0800 (PST) Date: Thu, 9 Nov 2017 11:26:13 +0100 From: Michal Hocko 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> Sender: owner-linux-mm@kvack.org List-ID: 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@home.goodmis.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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org