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,URIBL_BLOCKED,USER_AGENT_SANE_2 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 2CF1BC43331 for ; Thu, 5 Sep 2019 16:11:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D2A912082E for ; Thu, 5 Sep 2019 16:11:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728601AbfIEQLL (ORCPT ); Thu, 5 Sep 2019 12:11:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:42706 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726635AbfIEQLK (ORCPT ); Thu, 5 Sep 2019 12:11:10 -0400 Received: from oasis.local.home (bl11-233-114.dsl.telepac.pt [85.244.233.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CDE2820693; Thu, 5 Sep 2019 16:11:07 +0000 (UTC) Date: Thu, 5 Sep 2019 12:11:01 -0400 From: Steven Rostedt To: Thomas Gleixner Cc: Peter Zijlstra , Petr Mladek , John Ogness , Andrea Parri , Sergey Senozhatsky , Sergey Senozhatsky , Brendan Higgins , Linus Torvalds , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, "contact@linuxplumbersconf.org" , Theodore Ts'o Subject: Re: [RFC PATCH v4 0/9] printk: new ringbuffer implementation Message-ID: <20190905121101.60c78422@oasis.local.home> In-Reply-To: References: <20190807222634.1723-1-john.ogness@linutronix.de> <20190904123531.GA2369@hirez.programming.kicks-ass.net> <20190905130513.4fru6yvjx73pjx7p@pathway.suse.cz> <20190905143118.GP2349@hirez.programming.kicks-ass.net> X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Added Ted and Linux Plumbers ] On Thu, 5 Sep 2019 17:38:21 +0200 (CEST) Thomas Gleixner wrote: > On Thu, 5 Sep 2019, Peter Zijlstra wrote: > > On Thu, Sep 05, 2019 at 03:05:13PM +0200, Petr Mladek wrote: > > > The alternative lockless approach is still more complicated than > > > the serialized one. But I think that it is manageable thanks to > > > the simplified state tracking. And I might safe use some pain > > > in the long term. > > > > I've not looked at it yet, sorry. But per the above argument of needing > > the CPU serialization _anyway_, I don't see a compelling reason not to > > use it. > > > > It is simple, it works. Let's use it. > > > > If you really fancy a multi-writer buffer, you can always switch to one > > later, if you can convince someone it actually brings benefits and not > > just head-aches. > > Can we please grab one of the TBD slots at kernel summit next week, sit > down in a room and hash that out? > We should definitely be able to find a room that will be available next week. -- Steve