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 08:53:27 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
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

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).