linux-kernel - Re: [PATCH V5 09/12] perf: make events stream always parsable

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Message-ID: <20130712145515.GI17211@twins.programming.kicks-ass.net>
Date:	Fri, 12 Jul 2013 16:55:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH V5 09/12] perf: make events stream always parsable

On Fri, Jul 12, 2013 at 03:56:01PM +0300, Adrian Hunter wrote:
> > There's events where this isn't a possible location; take PERF_RECORD_MMAP for
> > instance; the tail is the complete filename.
> 
> PERF_RECORD_MMAP falls in the category I have called non-sample events.
> Those events are appended with an ID sample.  perf tools parses the ID
> sample backwards from header.size.  So the ID is at the last position
> relative to header.size

But why? Why make it different per PERF_RECORD type? 
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