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=-7.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_PASS,USER_AGENT_MUTT 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 0AACAC43387 for ; Tue, 18 Dec 2018 14:56:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CC74C21850 for ; Tue, 18 Dec 2018 14:56:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="qwv4a3zp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726854AbeLRO4D (ORCPT ); Tue, 18 Dec 2018 09:56:03 -0500 Received: from mail-pf1-f195.google.com ([209.85.210.195]:46070 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726744AbeLRO4D (ORCPT ); Tue, 18 Dec 2018 09:56:03 -0500 Received: by mail-pf1-f195.google.com with SMTP id g62so8228771pfd.12 for ; Tue, 18 Dec 2018 06:56:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:date:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=c8gnshy4dGyK1gbESzmeHTl5eK9cjXYiVhR5tCRSYfo=; b=qwv4a3zph87D4yDvKUapEMKizbTbJidFPnB49VZgcLicX2mt2NlMxRMzGlI7WqEVN8 QhzoGsbu0jW78zgXve3+j0B4IflNI5deqnzeZ6kCrlsBPbxDeaQ8XKs3v1jQeRkrL/L+ +GW9KukzY4Dj/T/E1cbFSmT9w5+AdnDYSt5VjBNl5PCSPyjicW+4mKp8Bagmnk6u7XEc ieDGVBqoP/ZD0fPAdwlm82Lnq1BeGgOBszMEXXEGMf1B3lppt9z4mbEQreo6FV/ZzI18 PKyzwxVnpO9eX1xvVhDPdxlxJqtRqY108jNILPB4HAjwDYiw5H2FTi3D1K6mEWjSHL/I JquQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:date:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=c8gnshy4dGyK1gbESzmeHTl5eK9cjXYiVhR5tCRSYfo=; b=JxaNeyVFUFZmJv7KIiWjkHRkNxccF9ev/zLX/I1nFWpeWwE31CEFjIH8P2QM3NHxpR 4ELc8OP1fEJEbETiPk9JPOfZBlVViWPaJLlWGH9SNA/T7tPLt9KjBHI1+hqMcsbpNiBJ pJD9ZH6DZCyL/2Q2I6BDDjmjF5XHhJAI7Jae2LeMEHNwQd7n8Y0Hzlyi1kknRsHQQD+q NxZFzPc2Y8eFIvBM209XGQOVxI4aQXscvYdK0EWyrtIbjJW4aedmveCXPRGAtNfON/KF 0wZtxt4H0XRLqD47AbfH+0C1kiWYEyJyT0v8RACoweiUfl0qJ8jRZ42qmtePREh90D1i pLUw== X-Gm-Message-State: AA+aEWbnvSRrAShHtz6cN7yPwkV75zMUrrLXq0C86L1udc8xEQBY+e/u YbBzirs8Nqqx9CreabNGksY= X-Google-Smtp-Source: AFSGD/WyNM1wYKLqAnydXyz06msDCqXik8NNA3spQDJ/KvTTUqWCT2mXA6zr5H4E2gZRawUuZ11hEw== X-Received: by 2002:a62:3241:: with SMTP id y62mr16818764pfy.178.1545144962006; Tue, 18 Dec 2018 06:56:02 -0800 (PST) Received: from localhost ([121.137.63.184]) by smtp.gmail.com with ESMTPSA id g11sm21003856pfo.139.2018.12.18.06.56.00 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 18 Dec 2018 06:56:00 -0800 (PST) From: Sergey Senozhatsky X-Google-Original-From: Sergey Senozhatsky Date: Tue, 18 Dec 2018 23:55:58 +0900 To: Borislav Petkov Cc: Sergey Senozhatsky , Sergey Senozhatsky , Peter Zijlstra , Petr Mladek , Steven Rostedt , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: [RFC][PATCH] printk: increase devkmsg write() ratelimit Message-ID: <20181218145558.GD665@tigerII.localdomain> References: <20181218091842.4996-1-sergey.senozhatsky@gmail.com> <20181218104812.GC15430@hirez.programming.kicks-ass.net> <20181218111701.GA32522@jagdpanzerIV> <20181218114709.GF7485@zn.tnic> <20181218130750.GA665@tigerII.localdomain> <20181218142623.GH7485@zn.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181218142623.GH7485@zn.tnic> User-Agent: Mutt/1.11.1 (2018-12-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On (12/18/18 15:26), Borislav Petkov wrote: > On Tue, Dec 18, 2018 at 10:07:50PM +0900, Sergey Senozhatsky wrote: > > This is right before shutdown. dmesg is not really available anymore. > > I can only guess why do they write it to devkmsg - to make it appear > > on the serial/net console, perhaps. Dunno. > > But still, why do we want to see those messages and enlarge the > ratelimit for that? Do they contain any particularly important > information? Good question. Theoretically, there can be some interesting stuff. Examples: https://bugzilla.redhat.com/show_bug.cgi?id=1515373#c6 or https://github.com/systemd/systemd/issues/5433 -ss