Re: [PATCH net-next 2/2] samples/bpf: add samples for HW_CACHE / RAW events

[David Miller]

From: Alexei Starovoitov <ast@xxxxxx>
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 :-)