linux-kernel - Re: [PATCH] trace: reorder struct ring_buffer_per

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Date:	Thu, 25 Mar 2010 13:44:03 +0000
From:	Richard Kennedy <richard@....demon.co.uk>
To:	rostedt@...dmis.org
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH] trace: reorder struct ring_buffer_per_cpu to remove
 padding on 64bit

On Thu, 2010-03-25 at 09:38 -0400, Steven Rostedt wrote:
> On Thu, 2010-03-25 at 11:27 +0000, Richard Kennedy wrote:
> > Reorder structure to remove 8 bytes of padding on 64 bit builds.
> > This shrinks the size to 128 bytes so allowing allocation from a smaller
> > slab & needed one fewer cache lines.
> > 
> 
> Thanks!
> 
> Just curious, did you use Arnaldo's pahole utility to find this?
> 
> -- Steve
No, but something similar I guess. I wrote my own tool that parses the
debug data & filters out the interesting results ;)

Richard

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