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

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Message-ID: <20100120061551.GB6588@in.ibm.com>
Date:	Wed, 20 Jan 2010 11:45:51 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Peter Zijlstra <peterz@...radead.org>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>, linux-next@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>, utrace-devel@...hat.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus <torvalds@...ux-foundation.org>
Subject: Re: linux-next: add utrace tree

On Wed, Jan 20, 2010 at 06:49:50AM +0100, Ingo Molnar wrote:

Ingo,

> Note, i'm not yet convinced that this (and the rest: uprobes and systemtap, 
> etc.) can go uptream in its present form.

Agreed, uprobes is still not upstream ready -- it was an RFC. We are
working through the comments there to get it ready for merger.

> IMHO the far more important thing to address beyond formalities and workflow 
> cleanliness are the (many) technical observations and objections offered by 
> Peter Zijstra on lkml. Not just the git history but also the abstractions and 
> concepts are messy and should be reworked IMO, and also good and working perf 
> events integration should be achieved, etc.

I think Oleg addressed most of Peter's concerns on utrace when the
ptrace/utrace patchset was reposted.

Perf integration with uprobes will be done and discussions have started
with Masami and Frederic. There are a couple of fundamental technical
aspects (XOL vma vs. emulation; breakpoint insertion through CoW and not
through quiesce) that need resolution.

> The fact that there's a well established upstream workflow for instrumentation 
> patches, which is being routed around by the utrace/uprobes/systemtap code 
> here is not a good sign in terms of reaching a good upstream solution. Lets 
> hope it works out well though.

Agreed.

On the other hand, having ptrace/utrace in the -next tree will give it a
lot more testing, while any outstanding technical issues are being addressed.

Stephen,
To exercise ptrace/utrace, it would be very useful if you pulled in

git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-utrace.git branch utrace-ptrace

instead of 'master'.

Thanks,
Ananth
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