linux-kernel - Re: [RFC PATCH 00/22] perf tools: introduce 'perf bpf' command to load eBPF programs.

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Date:	Tue, 5 May 2015 12:39:52 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Wang Nan <wangnan0@...wei.com>, davem@...emloft.net,
	masami.hiramatsu.pt@...achi.com, jolsa@...nel.org,
	lizefan@...nel.org, linux-kernel@...r.kernel.org, pi3orama@....com,
	hekuang@...wei.com, bgregg@...flix.com
Subject: Re: [RFC PATCH 00/22] perf tools: introduce 'perf bpf' command to
 load eBPF programs.

Em Fri, May 01, 2015 at 09:56:23AM -0700, Alexei Starovoitov escreveu:
> Anyway, back to my original question about long term home.
> where to land 'perf/bpf' branch ?

I don't care, but for me to merge it, please go on addressing the
comments made in this thread (perf bpf command --args, etc) and at some
point provide a small patchset that implements the most basic stuff,
like, say, a "hello, world" style proggie, together with the
tools/perf/Documentation/perf-bpf.txt file, detailed instructions on how
to use the feature, i.e. what dependencies are needed, what kernel
options should be enabled, etc.

Nice warning/error messages for when the user doesn't have those options
enabled or doesn't have appropriate permissions, etc.

I.e. just by following what is in each changeset comment log I should be
able to test patch after patch.

After we get one such, say, 10-long patchkit with a very basic feature
of eBPF exposed via 'perf bpf', we can go to the next, and so on.

Try to use 'perf trace usleep 1', 'perf trace -a usleep 1' as non-root,
for instance, to see examples on how to inform the user about what is
needed to use the tool.

- Arnaldo
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