linux-kernel - Re: [PATCH RFC net-next] tracing: accelerate tracing filters with BPF

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Message-ID: <20140514050905.GA9448@gmail.com>
Date:	Wed, 14 May 2014 07:09:05 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH RFC net-next] tracing: accelerate tracing filters with BPF


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

> On Tue, May 13, 2014 at 8:07 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> > On Tue, 13 May 2014 19:55:11 -0700
> > Alexei Starovoitov <ast@...mgrid.com> wrote:
> >
> >> --- a/kernel/trace/Kconfig
> >> +++ b/kernel/trace/Kconfig
> >> @@ -79,6 +79,7 @@ config FTRACE_NMI_ENTER
> >>         default y
> >>
> >>  config EVENT_TRACING
> >> +     depends on NET
> >>       select CONTEXT_SWITCH_TRACER
> >>       bool
> >>
> >
> > This part makes me a little nervous. I know a lot of embedded devices
> > depend on tracing, but do they all have network?
> 
> I think we may want to split BPF into its own config, since it doesn't
> really depend on anything in net.

Exactly, that's a good plan.

Thanks,

	Ingo
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