linux-kernel - Re: [PATCH RFC net-next 11/14] tracing: allow eBPF programs to be attached to events

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Message-ID: <CAMEtUuwhU6WerFL3gV-B7h0V4gepe=G2LChORHTwS-fYN-eNug@mail.gmail.com>
Date:	Tue, 1 Jul 2014 13:06:31 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chema Gonzalez <chema@...gle.com>,
	Eric Dumazet <edumazet@...gle.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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Linux API <linux-api@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC net-next 11/14] tracing: allow eBPF programs to be
 attached to events

On Tue, Jul 1, 2014 at 1:30 AM, Daniel Borkmann <dborkman@...hat.com> wrote:
> On 06/28/2014 02:06 AM, Alexei Starovoitov wrote:
>>
>> User interface:
>> cat bpf_123 > /sys/kernel/debug/tracing/__event__/filter
>>
>> where 123 is an id of the eBPF program priorly loaded.
>> __event__ is static tracepoint event.
>> (kprobe events will be supported in the future patches)
>>
>> eBPF programs can call in-kernel helper functions to:
>> - lookup/update/delete elements in maps
>> - memcmp
>> - trace_printk
>> - load_pointer
>> - dump_stack
>
>
> Are there plans to let eBPF replace the generic event
> filtering framework in tracing?

yes. the other patch that replaces predicate tree walking with
eBPF programs is pending on eBPF split out of networking.
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