linux-kernel - Re: [PATCH 00/14] [GIT PULL][v2.6.39] tracing/filter: More robust filtering

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Date:	Tue, 15 Feb 2011 17:53:06 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 00/14] [GIT PULL][v2.6.39] tracing/filter: More robust
 filtering

On Tue, Feb 15, 2011 at 11:29:22AM -0500, Steven Rostedt wrote:
> On Tue, 2011-02-15 at 08:33 -0500, Steven Rostedt wrote:
> 
> > Thanks for letting me waste three days on developing this. I even posted
> > an RFC a while back, and no one complained then.
> 
> Sorry about being a bit bitchy in my reply here. I need to make a note
> not to reply to LKML before my first cup of coffee. ;)
> 
> Arnaldo,
> 
> Thanks for the post, I'll help you out where you need it. trace-cmd has
> some features that reports back to the user on failed filter usage. We
> can incorporate that into perf.

Cool!

That said I agree that we should not block improvements in the generic
filtering code because of issues in perf uses of filters.

I believe it used to work better in perf by the past, but I saw similar
issues lately like those Ingo noticed. So probably something
broke and we need to investigate. But until then your patches are
still nice improvements: lesser memory usage, lesser kernel stack usage in the
fast path, lesser limitation, faster and smarter filter evaluation...
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