Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756452Ab1FFRNj (ORCPT ); Mon, 6 Jun 2011 13:13:39 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:58581 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756161Ab1FFRNf (ORCPT ); Mon, 6 Jun 2011 13:13:35 -0400 Date: Mon, 6 Jun 2011 19:13:10 +0200 From: Ingo Molnar To: Peter Zijlstra Cc: Arne Jansen , Linus Torvalds , mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, efault@gmx.de, npiggin@kernel.dk, akpm@linux-foundation.org, frank.rowand@am.sony.com, tglx@linutronix.de, linux-tip-commits@vger.kernel.org Subject: Re: [debug patch] printk: Add a printk killswitch to robustify NMI watchdog messages Message-ID: <20110606171310.GF2391@elte.hu> References: <20110606145827.GD30348@elte.hu> <1307372989.2322.136.camel@twins> <1307375227.2322.161.camel@twins> <20110606155236.GA7374@elte.hu> <1307376039.2322.164.camel@twins> <20110606160810.GA16636@elte.hu> <1307376771.2322.168.camel@twins> <20110606161749.GA22157@elte.hu> <1307378649.2322.198.camel@twins> <1307379048.2322.199.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1307379048.2322.199.camel@twins> User-Agent: Mutt/1.5.20 (2009-08-17) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 737 Lines: 23 * Peter Zijlstra wrote: > Aside from not compiling (someone stuck a ref to wake_up_klogd > somewhere in lib/) this does delay the whole of printk() output by > up to a jiffy, if the machine dies funny you could be missing large > parts of the output :/ oh, that's bad and i missed that aspect. We want the console *output* immediately. That's non-negotiable! What we want to delay are the various wakeups of secondary recipients of printks ... Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/