linux-kernel - Re: [ANNOUNCE] New utility: 'trace'

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Message-ID: <20101116220851.GA15052@elte.hu>
Date:	Tue, 16 Nov 2010 23:08:51 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Darren Hart <dvhart@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Jason Baron <jbaron@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Christoph Hellwig <hch@....de>,
	Pekka Enberg <penberg@...nel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [ANNOUNCE] New utility: 'trace'


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Tue, 2010-11-16 at 22:59 +0100, Ingo Molnar wrote:
> > 
> > 
> > Would you be interested in helping out with (and testing) such a more generic 
> > approach?
> 
> how about having perf-record open a named pipe and rewriting everything that comes 
> in through that as an event and storing it in the buffer?

Yeah, that would work too in most cases - except if there's no VFS connection 
between tracer and tracee. (as it might be in the case of say chroot environments, 
etc.)

I think it's better to have kernel solutions that dont modify the VFS beyond the 
trace.data session info. A task could thus generate a user-space event without 
having to negotiate with the tracer.

Thanks,

	Ingo
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