linux-kernel - Re: [PATCH v2 2.6.38-rc8-tip 0/20] 0: Inode based uprobes

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Message-ID: <1300297449.16880.45.camel@gandalf.stny.rr.com>
Date:	Wed, 16 Mar 2011 13:44:09 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Tom Tromey <tromey@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	SystemTap <systemtap@...rces.redhat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 2.6.38-rc8-tip 0/20] 0: Inode based uprobes

On Wed, 2011-03-16 at 11:32 -0600, Tom Tromey wrote:
> Steve> I'm more interested in the perf/trace than gdb, as the way gdb is mostly
> Steve> used (at least now) to debug problems in the code with a big hammer
> Steve> (single step, look at registers/variables). That is, gdb is usually very
> Steve> interactive and its best to "stop the code" from running to examine what
> Steve> has happened. gdb is not something you will run on an application that
> Steve> is being used by others.
> 
> It depends.  People do in fact do this stuff.  In recent years gdb got
> its own implementation of "always inserted" breakpoints (basically the
> same idea as uprobes) to support some trickier multi-thread debugging
> scenarios.

Like I said, if it helps out gdb then great! My concern is that we will
want it to replace ptrace, where it may not be designed to, then people
will start NAKing it.

I hope that gdb uses it, and we don't add another interface that nobody
uses. But I don't see that happening with uprobes.

-- Steve


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