linux-kernel - Re: [PATCH 32/32] bpf: Introduce function for outputing data to perf event

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Message-ID: <55E1174A.2000102@plumgrid.com>
Date:	Fri, 28 Aug 2015 19:22:02 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	"Wangnan (F)" <wangnan0@...wei.com>, acme@...hat.com
Cc:	brendan.d.gregg@...il.com, daniel@...earbox.net, dsahern@...il.com,
	hekuang@...wei.com, jolsa@...nel.org, xiakaixu@...wei.com,
	masami.hiramatsu.pt@...achi.com, namhyung@...nel.org,
	a.p.zijlstra@...llo.nl, lizefan@...wei.com, pi3orama@....com,
	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 32/32] bpf: Introduce function for outputing data to perf
 event

On 8/28/15 7:15 PM, Wangnan (F) wrote:
> I'd like to see whether it is possible to create dynamic tracepoints so
> different receivers can listen on different tracepoints.

see my proposal A. I think ftrace instances might work for this.

I'm not sure about 'format' part though. Kernel side shouldn't be
aware of it. It's only the contract between bpf program and user process
that deals with it.

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