linux-kernel - Re: [RFC][PATCH] tracing: Remove useless 4 bytes of padding from every event

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


* Arjan van de Ven <arjan@...ux.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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