Date: Thu, 17 May 2012 10:06:52 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Arjan van de Ven <arjan@linux.intel.com>
Cc: Dave Jones <davej@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        David Sharp <dhsharp@google.com>,
        Vaibhav Nagarnaik <vnagarnaik@google.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC][PATCH] tracing: Remove useless 4 bytes of padding from
 every event
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* Arjan van de Ven <arjan@linux.intel.com> wrote:

> > One possibility would be a config symbol to enable the 
> > deprecated field (kind of like what we did with compat 
> > vdso).  Distros that have a new enough powertop can then 
> > disable it.
> 
> this isn't really about distro kernels; a distro that pushes a 
> 3.7 kernel to Fedora 15 might as well do a powertop upgrade.. 
> the later is much simpler and lighter (the main difference 
> between 1.98 and 2.0 is the use of the perfevent library 
> anyway)
> 
> it's about people who compile their own upstream kernel...

Nor should we waste too much time over these 4 bytes really. Is 
the kernel really in such a good shape that we must spend our 
time trying to break working apps, over a mostly cosmetic detail 
in an ABI which will soon be messed up with our next set up 
mistakes anyway? ;-)

Thanks,

	Ingo
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