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=-6.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 89DF4C433DF for ; Thu, 25 Jun 2020 14:14:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6FD4C20707 for ; Thu, 25 Jun 2020 14:14:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405356AbgFYOOA (ORCPT ); Thu, 25 Jun 2020 10:14:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44550 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405286AbgFYON7 (ORCPT ); Thu, 25 Jun 2020 10:13:59 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 913CAC08C5C1 for ; Thu, 25 Jun 2020 07:13:59 -0700 (PDT) Received: from localhost ([127.0.0.1] helo=vostro) by Galois.linutronix.de with esmtps (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1joSdW-0000GD-HJ; Thu, 25 Jun 2020 16:13:54 +0200 From: John Ogness To: Dave Young Cc: Petr Mladek , Andrea Parri , Sergey Senozhatsky , Paul McKenney , Peter Zijlstra , Greg Kroah-Hartman , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Steven Rostedt , Sergey Senozhatsky , Thomas Gleixner , Linus Torvalds Subject: Re: [PATCH v3 0/3] printk: replace ringbuffer References: <20200618144919.9806-1-john.ogness@linutronix.de> <20200625071959.GA18744@dhcp-128-65.nay.redhat.com> Date: Thu, 25 Jun 2020 16:13:52 +0200 In-Reply-To: <20200625071959.GA18744@dhcp-128-65.nay.redhat.com> (Dave Young's message of "Thu, 25 Jun 2020 15:19:59 +0800") Message-ID: <87wo3vi673.fsf@jogness.linutronix.de> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Dave, On 2020-06-25, Dave Young wrote: > On 06/18/20 at 04:55pm, John Ogness wrote: >> Here is a v3 for the first series to rework the printk >> subsystem. The v2 and history are here [0]. This first series >> only replaces the existing ringbuffer implementation. No locking >> is removed. No semantics/behavior of printk are changed. >> >> Reviews on the ringbuffer are still ongoing, but I was asked to >> post this new version since several changes from v2 have been >> already agreed upon. >> >> The series is based on v5.8-rc1. > > Do you have the kdump userspace part link so that people can try > and do some testing? > > Eg. some makedumpfile/crash tool git branch etc. I have set up github forks, each with the RFC patch on top in their respective "printk" branch: https://github.com/Linutronix/crash.git https://github.com/Linutronix/makedumpfile.git Note that for crash, only the "log" command (using debug symbols) is implemented. The --log argument (using VMCOREINFO) is not implemented. For makedumpfile both symbol and VMCOREINFO variants are implemented. The VMCOREINFO implementation in makedumpfile shows that there is enough VMCOREINFO exported. So it will not be a problem to implement that for crash as well. John Ogness