Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753454Ab0AXXl2 (ORCPT ); Sun, 24 Jan 2010 18:41:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753205Ab0AXXlU (ORCPT ); Sun, 24 Jan 2010 18:41:20 -0500 Received: from ip-85-161-27-212.eurotel.cz ([85.161.27.212]:34003 "EHLO gprs189-60.eurotel.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751726Ab0AXXlT (ORCPT ); Sun, 24 Jan 2010 18:41:19 -0500 Date: Wed, 20 Jan 2010 13:55:46 +0100 From: Pavel Machek To: Peter Zijlstra Cc: Avi Kivity , ananth@in.ibm.com, Jim Keniston , Srikar Dronamraju , Ingo Molnar , Arnaldo Carvalho de Melo , utrace-devel , Frederic Weisbecker , Masami Hiramatsu , Maneesh Soni , Mark Wielaard , LKML Subject: Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP) Message-ID: <20100120125546.GC1420@ucw.cz> References: <20100111122529.22050.32596.sendpatchset@srikar.in.ibm.com> <1263467289.4244.288.camel@laptop> <1263498366.4875.25.camel@localhost.localdomain> <1263546228.4244.343.camel@laptop> <20100115093831.GC26396@in.ibm.com> <1263549014.4244.374.camel@laptop> <4B53213C.9050303@redhat.com> <1263739939.557.20938.camel@twins> <4B532508.4000806@redhat.com> <1263740506.557.20963.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1263740506.557.20963.camel@twins> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 953 Lines: 24 On Sun 2010-01-17 16:01:46, Peter Zijlstra wrote: > On Sun, 2010-01-17 at 16:56 +0200, Avi Kivity wrote: > > On 01/17/2010 04:52 PM, Peter Zijlstra wrote: > > > > Also, if its fixed size you're imposing artificial limits on the number > > > of possible probes. > > > > > > > Obviously we'll need a limit, a uprobe will also take kernel memory, we > > can't allow people to exhaust it. > > Only if its unprivilidged, kernel and root should be able to place as > many probes until the machine keels over. Well, it is address space that limits you in both cases... -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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/