Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756022AbZIKTvx (ORCPT ); Fri, 11 Sep 2009 15:51:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755968AbZIKTvv (ORCPT ); Fri, 11 Sep 2009 15:51:51 -0400 Received: from mx1.redhat.com ([209.132.183.28]:14830 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755952AbZIKTvu (ORCPT ); Fri, 11 Sep 2009 15:51:50 -0400 Subject: Re: [PATCH tracing/kprobes 0/7] tracing/kprobes: kprobe-based event tracer update and perf support From: Mark Wielaard To: Christoph Hellwig Cc: "Frank Ch. Eigler" , Frederic Weisbecker , Masami Hiramatsu , Steven Rostedt , Ingo Molnar , lkml , Ananth N Mavinakayanahalli , Andi Kleen , "H. Peter Anvin" , Jason Baron , Jim Keniston , "K.Prasad" , Lai Jiangshan , Li Zefan , Peter Zijlstra , Srikar Dronamraju , Tom Zanussi , systemtap , DLE In-Reply-To: <20090911190651.GA22065@infradead.org> References: <20090910235258.22412.29317.stgit@dhcp-100-2-132.bos.redhat.com> <20090911013332.GB16396@nowhere> <20090911190651.GA22065@infradead.org> Content-Type: text/plain Date: Fri, 11 Sep 2009 21:50:13 +0200 Message-Id: <1252698613.2470.6.camel@hermans.wildebeest.org> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1633 Lines: 39 On Fri, 2009-09-11 at 15:06 -0400, Christoph Hellwig wrote: > On Fri, Sep 11, 2009 at 03:03:35PM -0400, Frank Ch. Eigler wrote: > > Frederic Weisbecker writes: > > > > > [...] I'm really looking forward seeing this C expression-like > > > kprobe creation tool. It seems powerful enough to replace printk + > > > kernel rebuild. No need anymore to write some printk to debug, > > > worrying, [...] > > > > To a large extent, systemtap had delivered this already some years > > ago, including the cushy ponies dancing in the sunlight. While such > > low-level machinery is fine, some of our experience indicates that it > > is dramatically easier to use if high-level, symbolic, debugging data > > is used to compute probe locations and variable names/types/locations. > > No, systemtap has been for years failing to delivers this in a way that > it could be usefully integrated into the kernel. You are saying "No" to a claim Frank didn't even make. > Masami's patches are > exactly the kind of low-level functionality we absolutely need in the > kernel tree so that we can built more useful higherlevel tools ontop > of this. And nobody is denying that either. I think everybody agrees that Masami is doing some really wonderful work and improving the kprobes foundations in a way that any higher level tracing tool will benefit from it. Cheers, Mark -- 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/