Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932193AbYBLTDK (ORCPT ); Tue, 12 Feb 2008 14:03:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761641AbYBLTC4 (ORCPT ); Tue, 12 Feb 2008 14:02:56 -0500 Received: from smtp2.linux-foundation.org ([207.189.120.14]:52020 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754843AbYBLTCz (ORCPT ); Tue, 12 Feb 2008 14:02:55 -0500 Date: Tue, 12 Feb 2008 11:01:59 -0800 (PST) From: Linus Torvalds To: Andi Kleen cc: Ingo Molnar , linux-kernel@vger.kernel.org, "Frank Ch. Eigler" , Roland McGrath , Thomas Gleixner , "H. Peter Anvin" , Andrew Morton Subject: Re: [git pull] kgdb-light -v10 In-Reply-To: <20080212192227.GB6458@one.firstfloor.org> Message-ID: References: <20080211230335.GA16102@elte.hu> <20080212100327.GA30873@one.firstfloor.org> <20080212112747.GA1569@elte.hu> <20080212121903.GA419@one.firstfloor.org> <20080212123839.GA15360@elte.hu> <20080212135027.GA1343@one.firstfloor.org> <20080212152846.GC3078@elte.hu> <20080212182024.GA4940@one.firstfloor.org> <20080212192227.GB6458@one.firstfloor.org> User-Agent: Alpine 1.00 (LFD 882 2007-12-20) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 987 Lines: 25 On Tue, 12 Feb 2008, Andi Kleen wrote: > > There tend to be timeouts (e.g. softlock/nmi watchdog at least). I think > some of the IPIs eventually time out too. In general losing a lot > of time can lead to weird side effects. I do agree that kgdb and watchdogs aren't like to work well together. And I don't think you can sanely expect to not have a "disable lockup detection" when you start poking around with kgdb. We also just have to expect that time will also stop while sometbody is messing around with kgdb. So I don't dispute that any kernel debugger will *always* be intrusive in those ways. That's pretty inevitable. I just think the code itself can try to avoid hooking into various places all over the map. Linus -- 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/