From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753928AbdKIKXD (ORCPT ); Thu, 9 Nov 2017 05:23:03 -0500 Received: from www262.sakura.ne.jp ([202.181.97.72]:54754 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750945AbdKIKXC (ORCPT ); Thu, 9 Nov 2017 05:23:02 -0500 To: mhocko@kernel.org, rostedt@goodmis.org Cc: 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 From: Tetsuo Handa References: <20171108102723.602216b1@gandalf.local.home> <20171109101138.qmy3366myzjafexr@dhcp22.suse.cz> In-Reply-To: <20171109101138.qmy3366myzjafexr@dhcp22.suse.cz> Message-Id: <201711091922.IHJ81787.OVQFFJOSOLtHMF@I-love.SAKURA.ne.jp> X-Mailer: Winbiff [Version 2.51 PL2] X-Accept-Language: ja,en,zh Date: Thu, 9 Nov 2017 19:22:58 +0900 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f69.google.com (mail-oi0-f69.google.com [209.85.218.69]) by kanga.kvack.org (Postfix) with ESMTP id 88157440CD7 for ; Thu, 9 Nov 2017 05:24:13 -0500 (EST) Received: by mail-oi0-f69.google.com with SMTP id f66so4234381oib.1 for ; Thu, 09 Nov 2017 02:24:13 -0800 (PST) Received: from www262.sakura.ne.jp (www262.sakura.ne.jp. [2001:e42:101:1:202:181:97:72]) by mx.google.com with ESMTPS id 96si2955595ote.459.2017.11.09.02.24.11 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 09 Nov 2017 02:24:12 -0800 (PST) Subject: Re: [PATCH v4] printk: Add console owner and waiter logic to loadbalance console writes From: Tetsuo Handa References: <20171108102723.602216b1@gandalf.local.home> <20171109101138.qmy3366myzjafexr@dhcp22.suse.cz> In-Reply-To: <20171109101138.qmy3366myzjafexr@dhcp22.suse.cz> Message-Id: <201711091922.IHJ81787.OVQFFJOSOLtHMF@I-love.SAKURA.ne.jp> Date: Thu, 9 Nov 2017 19:22:58 +0900 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org List-ID: To: mhocko@kernel.org, rostedt@goodmis.org Cc: 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 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. -- 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