linux-kernel - Re: [PATCH] percpu: add optimized generic percpu accessors

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Message-ID: <alpine.DEB.1.10.0901281145050.13825@qirst.com>
Date:	Wed, 28 Jan 2009 11:45:28 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
cc:	tj@...nel.org, rusty@...tcorp.com.au, mingo@...e.hu,
	herbert@...dor.apana.org.au, akpm@...ux-foundation.org,
	hpa@...or.com, brgerst@...il.com, ebiederm@...ssion.com,
	travis@....com, linux-kernel@...r.kernel.org, steiner@....com,
	hugh@...itas.com, netdev@...r.kernel.org,
	mathieu.desnoyers@...ymtl.ca
Subject: Re: [PATCH] percpu: add optimized generic percpu accessors

On Tue, 27 Jan 2009, David Miller wrote:

> > Why wont it scale? this is a separate TLB entry for each processor.
>
> The IA64 per-cpu TLB entry only covers 64k which makes use of it for
> dynamic per-cpu stuff out of the question.  That's why it "doesn't
> scale"

IA64 supports varying page sizes. You can use a 128k TLB entry etc.

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