linux-kernel - Re: perf: possible bug in perf_event__read

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Date:	Wed, 2 Sep 2015 11:40:40 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Vince Weaver <vincent.weaver@...ne.edu>
cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf: possible bug in perf_event__read_size

On Wed, 2 Sep 2015, Vince Weaver wrote:
> Shouldn't that be
> 
>        if (event->attr.read_format & PERF_FORMAT_ID)
>                size += sizeof(u64);

never mind, after a lot of further thought I can see this is a "clever" 
hack to allow group events to have an ID for each value.

It's a shame the perf_event code doesn't more comments in the code, 
especially when the code is being clever like this.

Vince
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