linux-kernel - Re: [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu areas for other cpus

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Message-ID: <alpine.DEB.1.10.0909231315310.4025@V090114053VZO-1>
Date:	Wed, 23 Sep 2009 13:17:10 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Tejun Heo <tj@...nel.org>
cc:	Nick Piggin <npiggin@...e.de>, Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	linux-ia64 <linux-ia64@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] ia64: allocate percpu area for cpu0 like percpu
 areas for other cpus

On Wed, 23 Sep 2009, Tejun Heo wrote:

> any special handling.  What problems are you seeing?

per cpu variable access on IA64 does not use the percpu_offset for the
calculation of the current per cpu data area. Its using a virtual mapping.

How does the new percpu allocator support this? Does it use different
methods of access for static and dynamic percpu access?


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