linux-kernel - Re: disabling group leader perf

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Message-ID: <AANLkTin8Ggcu=PYhfNbjFwSkL3=UZL40UQH+1WD5Hz6p@mail.gmail.com>
Date:	Mon, 6 Sep 2010 16:41:33 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Avi Kivity <avi@...hat.com>, Pekka Enberg <penberg@...helsinki.fi>,
	Tom Zanussi <tzanussi@...il.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	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

On 09/06/2010 03:43 PM, Ingo Molnar wrote:
>> > 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.
>> >
* Avi Kivity <avi@...hat.com> wrote:
>> > It might make sense to bring this concept a few steps further. Looks
>> > rather complex but also rather cool ...
>>
>> Is this a roundabout way of saying "jit"?

On Mon, Sep 6, 2010 at 3:59 PM, Ingo Molnar <mingo@...e.hu> wrote:
> Partly. I'm not sure we want to actually upload programs in bytecode
> form. ASCII is just fine - just like a .gz Javascript is fine for web
> apps. (and in most cases compresses down better than the bytecode
> equivalent)
>
> So a clear language (the simpler initially the better) plus an in-kernel
> compiler.
>
> This could be used for far more than just instrumentation: IMO security
> policies could be expressed in such a way. (Simplified, they are quite
> similar to filters installed on syscall entry/exit, with the ability of
> the filter to influence whether the syscall is performed.)

Filter engine? I've never heard of it before. Where does it live?
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