linux-kernel - Re: linux-next: add utrace tree

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Date:	Fri, 29 Jan 2010 10:11:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc:	Jim Keniston <jkenisto@...ibm.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Kyle Moffett <kyle@...fetthome.net>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Tom Tromey <tromey@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>, linux-next@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>, utrace-devel@...hat.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: linux-next: add utrace tree


* Ananth N Mavinakayanahalli <ananth@...ibm.com> wrote:

> On Fri, Jan 29, 2010 at 08:39:07AM +0100, Ingo Molnar wrote:
> 
> ...
> 
> > When we merged kprobes ~10 years ago we made the (rather bad) mistake of 
> > merging a raw, opaque facility and leaving 'the rest' up to some other entity. 
> > IBM kprobes hackers vanished the day the original kprobes code went upstream 
> > and the high level entity never truly materialized in-kernel, for nearly a 
> > decade!
> 
> I don't know what you are referring to here... Kprobes was merged in 2.6.9 
> (~August 2004 -- less than 6 years ago). [...]

Ok, 6 years then :-)

> [...] Since then, we did work on ports to powerpc and s390. We implemented 
> kretprobes. We made it much scalable using RCU; we did the powerpc booster 
> to skip single-step when possible, not to mention various bug fixes over the 
> years.

Except it had no real in-kernel user.

> Yes, we did not do the perf integration, but perf did not exist then, 
> either.
> 
> Its simply wrong to say people 'vanished'.

It has certainly was a bit stale for years - and with no real users that's 
certainly not a surprise. That has changed recently so i'm not complaining. We 
just dont want to repeat the same mistake with uprobes.

	Ingo
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