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

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Date:	Fri, 28 Aug 2015 18:34:37 -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 6:19 PM, Wangnan (F) wrote:
> For me, I use bpf_output_trace_data() to output information like PMU count
> value. Perf is the only receiver, so global collector is perfect. Could you
> please describe your usecase in more detail?

there is a special receiver in user space that only wants the data from
the bpf program that it loaded. It shouldn't conflict with any other
processes. Like when it's running, I still should be able to use perf
for other performance analysis. There is no way to share single
bpf:bpf_output_data event, since these user processes are completely
independent.

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