Re: [PATCH v4 1/3] perf: add PERF_RECORD_NAMESPACES to include namespaces related info

[Eric W. Biederman]

Peter Zijlstra <peterz@xxxxxxxxxxxxx> writes:

> On Thu, Dec 22, 2016 at 08:21:23PM +1300, Eric W. Biederman wrote:
>> 
>> And please make the array the last item in the structure so that
>> expanding or contracting it does not affect the ability to read the rest
>> of the structure.
>
> Sorry, sample_id must be last, because hysterical crud :/
>
> (basically because that was the only way to add a field to records like
> PERF_RECORD_MMAP which used the record length to determine the
> filename[] length, yes I know, we won't ever do that again).

Why does historical crud need to affect new records?

Totally confused.  This looks like a major mess.

Eric