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

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Message-ID: <alpine.LFD.2.00.1011171657400.2900@localhost6.localdomain6>
Date:	Wed, 17 Nov 2010 16:58:08 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Avi Kivity <avi@...hat.com>
cc:	Tom Zanussi <tzanussi@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, "Ted Ts'o" <tytso@....edu>,
	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>,
	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'

On Wed, 17 Nov 2010, Avi Kivity wrote:

> On 11/17/2010 05:41 PM, Tom Zanussi wrote:
> > 
> > > The only reason why these filters might make sense is to reduce the
> > > trace volume on system wide traces in production environments, but
> > > that's a completely different story. These scenarios can do with the
> > > dynamic tracepoint stuff and the custom filtering w/o putting the
> > > burden on the majority of users.
> > > 
> > Yeah, in my mind, the main point of the filters was to be a 'blunt
> > force' instrument preventing userspace from being overwhelmed by events.
> > The real filtering would happen in userspace with e.g. real scripting
> > languages.
> > 
> 
> Filtering is also useful for fine-grained perf events; this cannot be done in
> userspace.

Could you explain that a bit more detailed please ?

Thanks,

	tglx
 
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