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Message-ID: <20100129091116.GB10878@elte.hu>
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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