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

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Message-ID: <4CE3FB0D.30902@redhat.com>
Date:	Wed, 17 Nov 2010 17:55:57 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Tom Zanussi <tzanussi@...il.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	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 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.

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