linux-kernel - Re: [PATCH v4 0/4] bpf: Introduce the new ability of eBPF programs to access hardware PMU counter

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Date:	Wed, 29 Jul 2015 18:50:09 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Daniel Borkmann <daniel@...earbox.net>,
	Kaixu Xia <xiakaixu@...wei.com>, davem@...emloft.net,
	acme@...nel.org, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	masami.hiramatsu.pt@...achi.com, jolsa@...nel.org
Cc:	wangnan0@...wei.com, linux-kernel@...r.kernel.org,
	pi3orama@....com, hekuang@...wei.com
Subject: Re: [PATCH v4 0/4] bpf: Introduce the new ability of eBPF programs to
 access hardware PMU counter

On 7/29/15 5:08 PM, Daniel Borkmann wrote:
> On 07/28/2015 01:17 PM, Kaixu Xia wrote:
>> Previous patch v3 url:
>> https://lkml.org/lkml/2015/7/23/203
> ...
>> Kaixu Xia (3):
>>    bpf: Add new bpf map type to store the pointer to struct perf_event
>>    bpf: Implement function bpf_perf_event_read() that get the selected
>>      hardware PMU conuter
>>    samples/bpf: example of get selected PMU counter value
>>
>> Wang Nan (1):
>>    bpf: Make the bpf_prog_array_map more generic
>
> So kernel/bpf/ patches are usually going via netdev tree as main
> development
> happens there and to avoid cross tree conflicts, etc. Thus, please Cc also
> netdev in the next iterations.
>
> Maybe when these patches are in a perfect shape at some point, perf folks
> provide their Acked-by(s) to the series to give their consent, and then
> this
> should go via net-next? Or will this be organized differently?

In this case it looks that amount of kernel/bpf/ changes is higher than
perf related. Also it looks like addition of bpf_perf_event_read()
helper also won't affect anything on perf side, so in this case I think
net-next tree is indeed a better fit.

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