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From: Steven Rostedt <rostedt@goodmis.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Eric Paris" <eparis@redhat.com>,
	"Tom Zanussi" <tzanussi@gmail.com>,
	"Frédéric Weisbecker" <fweisbec@gmail.com>,
	"Arnaldo Carvalho de Melo" <acme@redhat.com>,
	"Li Zefan" <lizf@cn.fujitsu.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Masami Hiramatsu" <masami.hiramatsu.pt@hitachi.com>,
	"Eric Paris" <eparis@parisplace.org>,
	linux-kernel@vger.kernel.org, agl@google.com,
	"Jason Baron" <jbaron@redhat.com>,
	"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
	2nddept-manager@sdl.hitachi.co.jp
Subject: Re: Using ftrace/perf as a basis for generic seccomp
Date: Wed, 02 Feb 2011 13:17:55 -0500	[thread overview]
Message-ID: <1296670675.10797.58.camel@gandalf.stny.rr.com> (raw)
In-Reply-To: <20110202175556.GA13948@elte.hu>

On Wed, 2011-02-02 at 18:55 +0100, Ingo Molnar wrote:

> The filter expression engine executes in the kernel, when the event happens. The 
> user-space perf tool parses the --filter parameter and passes it to the kernel as a 
> string in essence. The kerner parses this into atomic predicaments which are linked 
> to the event structure. When the event happens the predicaments are executed by the 
> filter engine.
> 
> The expressions are simple, but rather flexible, so you can do 'fd==0||fd==1' and 
> more complex expressions, etc. The engine could also be extended.
> 
> The kernel code is mostly in kernel/trace/trace_events_filter.c.
> 
> I've Cc:-ed Tom, Frederic, Steve, Li Zefan and Arnaldo who have worked on the filter 
> engine, in case something is broken with this functionality or if there are other 
> questions :)

Yep, and I'm currently working on them as well. As they currently have a
32 pred limit (may seem like a lot, but I actually hit it). And I've
also added short circuits (0 && .... no need to process more).

I posted an RFC:

https://lkml.org/lkml/2011/1/27/438

and I'm again working on finishing it. Just a few more things to do. I
got side tracked because my employer actually asked me to do something
for them ;)

-- Steve



  reply	other threads:[~2011-02-02 18:17 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-12 21:28 Eric Paris
2011-02-01 14:58 ` Eric Paris
2011-02-02 12:14   ` Masami Hiramatsu
2011-02-02 12:26     ` Ingo Molnar
2011-02-02 16:45       ` Eric Paris
2011-02-02 17:55         ` Ingo Molnar
2011-02-02 18:17           ` Steven Rostedt [this message]
2011-02-03 19:06         ` Frederic Weisbecker
2011-02-03 19:18           ` Frederic Weisbecker
2011-02-03 22:06           ` Stefan Fritsch
2011-02-03 23:10             ` Frederic Weisbecker
2011-02-04  1:50               ` Eric Paris
2011-02-04 14:31                 ` Peter Zijlstra
2011-02-04 16:29                   ` Eric Paris
2011-02-04 17:04                     ` Frederic Weisbecker
2011-02-05 11:51                       ` Stefan Fritsch
2011-02-07 12:26                         ` Peter Zijlstra
2011-02-04 16:36             ` Eric Paris
2011-02-05 11:42               ` Stefan Fritsch
2011-02-06 16:51                 ` Eric Paris

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