linux-kernel - Re: [PATCH] sched: reorder root_domain to remove 64 bit alignment padding

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Message-ID: <1310728994.1977.15.camel@castor.rsk>
Date:	Fri, 15 Jul 2011 12:23:14 +0100
From:	Richard Kennedy <richard@....demon.co.uk>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: reorder root_domain to remove 64 bit alignment
 padding

On Fri, 2011-07-15 at 12:44 +0200, Peter Zijlstra wrote:
> On Fri, 2011-07-15 at 11:41 +0100, Richard Kennedy wrote:
> > Reorder root_domain to remove 8 bytes of alignment padding on 64 bit
> > builds, this shrinks the size from 1736 to 1728 bytes, therefore using
> > one fewer cachelines.
> 
> depends a bit on how insane struct cpupri is, but yeah, good compaction.
> Thanks!

Thanks Peter,

argh -- I hadn't spotted that cpupri used NR_CPUS and was so variable in
size. I guess there won't be much benefit then, as the distros seem to
always set NR_CPUS to some insanely huge value ;)

regards
Richard 


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