linux-kernel - Re: [RFC] Proposal for ptrace improvements

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Date:	Fri, 11 Mar 2011 09:22:40 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Tejun Heo <tj@...nel.org>, Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>, jan.kratochvil@...hat.com,
	Denys Vlasenko <vda.linux@...glemail.com>,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org
Subject: Re: [RFC] Proposal for ptrace improvements

* Steven Rostedt <rostedt@...dmis.org> wrote:

> I don't think perf has a good way to trace userspace yet.

uprobes are being worked on (and that comes integrated with perf), and that will 
give a good mechanism - and it (of course) wont be doing any context-switching.

Peter might be able to fill us in on the details of the review progress of the 
uprobes patches.

> ftrace focuses on the kernel.

It will hopefully be integrated into the perf ABI soon, so that developers and users 
have a unified event platform for doing tracing, profiling, event logging and more - 
all of which go back to a very similar looking event platform. (Not sure what's 
holding up that process - there's no technical roadblocks really - it 'just has to 
be done'.)

Thanks,

	Ingo
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