linux-kernel - Re: disabling group leader perf

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Message-ID: <4C850147.8010908@redhat.com>
Date:	Mon, 06 Sep 2010 17:57:11 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	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 03:59 PM, Ingo Molnar wrote:
>
>> Is this a roundabout way of saying "jit"?
> 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.)

For me the requirements are:
- turing complete (more than just filters)
- easy interface to kernel APIs (like hrtimers)
- safe to use by untrusted users

The actual language doesn't really matter.

-- 
error compiling committee.c: too many arguments to function

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