linux-kernel - Re: [RFC 00/15] x86_64: Optimize percpu accesses

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Message-ID: <4876608B.10408@sgi.com>
Date:	Thu, 10 Jul 2008 12:18:35 -0700
From:	Mike Travis <travis@....com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses

Eric W. Biederman wrote:
> "H. Peter Anvin" <hpa@...or.com> writes:
> 
>> Almost half a megabyte in current allyesconfig, and that is not including
>> dynamic allocations at all.
> 
> Ouch!  This start to make me sad I removed the arbitrary cap on static
> percpu memory.
> 
> Eric

The biggest growth came from moving all the xxx[NR_CPUS] arrays into
the per cpu area.  So you free up a huge amount of unused memory when
the NR_CPUS count starts getting into the ozone layer.  4k now, 16k
real soon now, ??? future?

Mike
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