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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next 2/2] samples/bpf: add samples for HW_CACHE /
 RAW events
Date: Mon, 22 May 2017 19:40:41 -0400 (EDT)
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From: Alexei Starovoitov <ast@fb.com>
Date: Mon, 22 May 2017 16:35:07 -0700

> yet perf_event_read() is least documented. hmm.
>  * u64 bpf_perf_event_read(&map, index)
>  *     Return: Number events read or error code
> 
> that needs to be fixed.

That's exactly what I was talking about :-)