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Date:	Mon, 6 Sep 2010 14:43:30 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...hat.com>, Tom Zanussi <tzanussi@...il.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-perf-users@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: disabling group leader perf_event


* Avi Kivity <avi@...hat.com> wrote:

> > Being able to make histograms in-kernel has been on the todo list 
> > for a long while, its just that I never could come up with a sane 
> > interface.. :/
> 
> Interesting, I thought it was just me.
> 
> One option is to keep the existing filter interface, but recognize 
> those cases and optimize the implementation.  Sort of like a compiler 
> can optimize a large dense switch statement to a jump table.

Yes. The filter engine is a safe, in-kernel interpreted language in the 
making. The C syntax was chosen because it's close to the heart of every 
kernel developer.

It might make sense to bring this concept a few steps further. Looks 
rather complex but also rather cool ...

Thanks,

	Ingo
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