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Date: Tue, 1 Jul 2014 13:06:31 -0700
Message-ID: <CAMEtUuwhU6WerFL3gV-B7h0V4gepe=G2LChORHTwS-fYN-eNug@mail.gmail.com>
Subject: Re: [PATCH RFC net-next 11/14] tracing: allow eBPF programs to be
 attached to events
From: Alexei Starovoitov <ast@plumgrid.com>
To: Daniel Borkmann <dborkman@redhat.com>
Cc: "David S. Miller" <davem@davemloft.net>, Ingo Molnar <mingo@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Chema Gonzalez <chema@google.com>, Eric Dumazet <edumazet@google.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Jiri Olsa <jolsa@redhat.com>, Thomas Gleixner <tglx@linutronix.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Kees Cook <keescook@chromium.org>,
        Linux API <linux-api@vger.kernel.org>,
        Network Development <netdev@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
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On Tue, Jul 1, 2014 at 1:30 AM, Daniel Borkmann <dborkman@redhat.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.

From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alexei Starovoitov <ast-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org>
Subject: Re: [PATCH RFC net-next 11/14] tracing: allow eBPF programs to be
 attached to events
Date: Tue, 1 Jul 2014 13:06:31 -0700
Message-ID: <CAMEtUuwhU6WerFL3gV-B7h0V4gepe=G2LChORHTwS-fYN-eNug@mail.gmail.com>
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Cc: "David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
	Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	Steven Rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>,
	Chema Gonzalez <chema-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	Eric Dumazet <edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	Peter Zijlstra <a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>,
	Arnaldo Carvalho de Melo <acme-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
	Jiri Olsa <jolsa-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
	"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
	Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
	Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Network Development <netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
To: Daniel Borkmann <dborkman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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On Tue, Jul 1, 2014 at 1:30 AM, Daniel Borkmann <dborkman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 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.