From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754948Ab1FFQyH (ORCPT ); Mon, 6 Jun 2011 12:54:07 -0400 Received: from casper.infradead.org ([85.118.1.10]:55593 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751574Ab1FFQyE convert rfc822-to-8bit (ORCPT ); Mon, 6 Jun 2011 12:54:04 -0400 Subject: Re: [debug patch] printk: Add a printk killswitch to robustify NMI watchdog messages From: Peter Zijlstra To: Arne Jansen Cc: Ingo Molnar , 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 In-Reply-To: <4DED0423.4050904@die-jansens.de> References: <4DEB933C.1070900@die-jansens.de> <20110605151323.GA30590@elte.hu> <1307349530.2353.7374.camel@twins> <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> <4DED0292.1040605@die-jansens.de> <4DED0423.4050904@die-jansens.de> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Mon, 06 Jun 2011 18:53:57 +0200 Message-ID: <1307379237.2322.203.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2011-06-06 at 18:45 +0200, Arne Jansen wrote: > > As long as it doesn't scramble the order of the messages, the delay > > imho doesn't matter even in very printk-heavy debugging sessions. > > And, as important, doesn't reduce the throughput of printk. Having only > 100 wakeups/s sounds like the throughput is limited to 100xsizeof(ring > buffer). Right, that's another problem.. not really sure delaying all this is going to work :/