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

[Peter Zijlstra]

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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