netdev - Re: [PATCH net-next 2/3] bpf: introduce bpf_perf_event

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Message-ID: <5627CABD.7030609@plumgrid.com>
Date:	Wed, 21 Oct 2015 10:26:21 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>, Wang Nan <wangnan0@...wei.com>,
	He Kuang <hekuang@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 2/3] bpf: introduce bpf_perf_event_output()
 helper

On 10/21/15 5:06 AM, Peter Zijlstra wrote:
>>   	PERF_COUNT_SW_DUMMY			= 9,
>> >+	PERF_COUNT_SW_BPF_OUTPUT		= 10,
>> >
>> >  	PERF_COUNT_SW_MAX,			/* non-ABI */
>> >  };
> Do you really need the new type? Can't you use DUMMY for this?

It works fine with dummy, but user space code looked odd when
it perf_event_open-s dummy events and starts reading them.
So I thought either to add alias:
PERF_COUNT_SW_BPF_OUTPUT = PERF_COUNT_SW_DUMMY
or
add new number like I did above.
New number is cheap and I saw that dummy used for probing,
so went with new number to disambiguate.

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