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

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Date:   Thu, 22 Dec 2016 23:19:17 +1300
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Hari Bathini <hbathini@...ux.vnet.ibm.com>, ast@...com,
        lkml <linux-kernel@...r.kernel.org>, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, mingo@...hat.com,
        daniel@...earbox.net, rostedt@...dmis.org,
        Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
        sargun@...gun.me, Aravinda Prasad <aravinda@...ux.vnet.ibm.com>,
        brendan.d.gregg@...il.com
Subject: Re: [PATCH v4 1/3] perf: add PERF_RECORD_NAMESPACES to include namespaces related info

Peter Zijlstra <peterz@...radead.org> 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