linux-kernel - Re: [RFC PATCH tip 0/5] tracing filters with BPF

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Date:	Tue, 10 Dec 2013 16:47:48 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Jovi Zhangwei <jovi.zhangwei@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH tip 0/5] tracing filters with BPF


* Alexei Starovoitov <ast@...mgrid.com> wrote:

> > I'm fine if it becomes a requirement to have a vmlinux built with 
> > DEBUG_INFO to use BPF and have a tool like perf to translate the 
> > filters. But it that must not replace what the current filters do 
> > now. That is, it can be an add on, but not a replacement.
> 
> Of course. tracing filters via bpf is an additional tool for kernel 
> debugging. bpf by itself has use cases beyond tracing.

Well, Steve has a point: forcing DEBUG_INFO is a big showstopper for 
most people.

Would it be possible to make BFP filters recognize exposed details 
like the current filters do, without depending on the vmlinux?

Thanks,

	Ingo
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