linux-kernel - ftrace: concurrent accesses possible?

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Message-ID: <20090508125821.GC15949@localhost>
Date:	Fri, 8 May 2009 20:58:21 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Frédéric Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Li Zefan <lizf@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Matt Mackall <mpm@...enic.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: ftrace: concurrent accesses possible?

Hello,

On Fri, May 08, 2009 at 07:47:42PM +0800, Ingo Molnar wrote:
> 
> So this should be done in cooperation with instrumentation folks, 
> while improving _all_ of Linux instrumentation in general. Or, if 
> you dont have the time/interest to work with us on that, it should 
> not be done at all. Not having the resources/interest to do 
> something properly is not a license to introduce further 
> instrumentation crap into Linux.

I have a dummy question on /debug/trace: is it possible to
- use 2+ tracers concurrently?
- run a system script that makes use of a tracer,
  without disturbing the sysadmin's tracer activities?
- access 1 tracer concurrently from many threads,
  with different filter etc. options?

If not currently, will private mounts be a viable solution?

Thanks,
Fengguang
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