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

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Date:	Tue, 15 Mar 2011 01:22:24 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	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 Tue, 15 Mar 2011, Andi Kleen wrote:

> > IOW, I'm trying to get an understanding of how you expect this feature
> > will actually become useful to end users - the kernel patch is only
> > part of the story.
> 
> One user would be systemtap for user tracing as I understand. Systemtap has a 
> userbase (at least I use it, although not for user tracing)

That's a brilliant reason to drop it right away. systemtap is the
least of our worries.
 
> Right now lots of distros apply ugly patchkits to handle this instead,
> which is not good (tm).

s/lots of distros/some enterprise distros where the management still
believes that this is a valuable feature add/

You deliberately skipped the first part of akpms question:

> How do you envisage these features actually get used?  For example,
> will gdb be modified?  Will other debuggers be modified or written?

How about answering this question first _BEFORE_ advertising
systemtap?

Thanks,

	tglx
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