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

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Message-ID: <53B271C0.5090008@redhat.com>
Date:	Tue, 01 Jul 2014 10:30:56 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Alexei Starovoitov <ast@...mgrid.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@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC net-next 11/14] tracing: allow eBPF programs to be
 attached to events

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?

> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
> ---
>   include/linux/ftrace_event.h       |    5 +
>   include/trace/bpf_trace.h          |   29 +++++
>   include/trace/ftrace.h             |   10 ++
>   include/uapi/linux/bpf.h           |    5 +
>   kernel/trace/Kconfig               |    1 +
>   kernel/trace/Makefile              |    1 +
>   kernel/trace/bpf_trace.c           |  217 ++++++++++++++++++++++++++++++++++++
>   kernel/trace/trace.h               |    3 +
>   kernel/trace/trace_events.c        |    7 ++
>   kernel/trace/trace_events_filter.c |   72 +++++++++++-
>   10 files changed, 349 insertions(+), 1 deletion(-)
>   create mode 100644 include/trace/bpf_trace.h
>   create mode 100644 kernel/trace/bpf_trace.c
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