linux-kernel - Re: [RFC PATCH v3 00/37] perf tools: introduce 'perf bpf' command to load eBPF programs.

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Message-ID: <555A541F.6090606@plumgrid.com>
Date:	Mon, 18 May 2015 14:05:35 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Wang Nan <wangnan0@...wei.com>, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, mingo@...hat.com, namhyung@...nel.org,
	jolsa@...nel.org, dsahern@...il.com, daniel@...earbox.net,
	brendan.d.gregg@...il.com, masami.hiramatsu.pt@...achi.com,
	lizefan@...wei.com, linux-kernel@...r.kernel.org, pi3orama@....com
Subject: Re: [RFC PATCH v3 00/37] perf tools: introduce 'perf bpf' command
 to load eBPF programs.

On 5/18/15 1:44 PM, Arnaldo Carvalho de Melo wrote:
>
> perf record --filter, to pass a filter to tracepoints, if I could
> instead of a filter expression pass, say, filter_bpf.o, that would seem
> natural for me, i.e. no new option, just an alternative type of filter,
> one way more powerful.
...
> I'd say keep it in --filter, that noticing it is a bpf object would
> dtrt:
>
>    perf record --filter bpf_thing.o usleep 1
>

agree. make sense.
The only thing is that such bpf program defines both event and filter.
Existing --filter applies to --event, whereas this bpf_thing.o does both
and likely kprob-ing multiple events underneath.
I guess '--filter' still fits. Just need to document it clearly.

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