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

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Date:	Tue, 13 May 2014 23:17:08 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Ingo Molnar <mingo@...nel.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>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC net-next] tracing: accelerate tracing filters with
 BPF

On Tue, 13 May 2014 19:55:11 -0700
Alexei Starovoitov <ast@...mgrid.com> wrote:

> Tracing filters are parsing user supplied character string and constructing
> a predicate tree. filter_match_preds() was used to walk nodes of the tree to
> simulate matching of boolean expression.
> 

I applied this on top of net-next, from:

 git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git
 (master branch)

and got this compile error:

kernel/trace/trace_events_filter.c: In function ‘emit_cond’:
kernel/trace/trace_events_filter.c:1361:36: error: ‘__bpf_call_base’ undeclared (first use in this function)
kernel/trace/trace_events_filter.c:1361:36: note: each undeclared identifier is reported only once for each function it appears in
kernel/trace/trace_events_filter.c: In function ‘filter_gen_bpf’:
kernel/trace/trace_events_filter.c:1622:2: error: implicit declaration of function ‘bpf_int_jit_compile’ [-Werror=implicit-function-declaration]

Config attached.

-- Steve

Download attachment "config.gz" of type "application/gzip" (24766 bytes)