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Date:	Mon, 6 Sep 2010 14:43:30 +0200
From:	Ingo Molnar <>
To:	Avi Kivity <>, Tom Zanussi <>,
	Frédéric Weisbecker <>,
	Steven Rostedt <>,
	Arnaldo Carvalho de Melo <>
Cc:	Peter Zijlstra <>,,
	linux-kernel <>
Subject: Re: disabling group leader perf_event

* Avi Kivity <> 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 ...


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