linux-kernel - Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu access overhead

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Message-ID: <Pine.LNX.4.64.0711011515451.22508@schroedinger.engr.sgi.com>
Date:	Thu, 1 Nov 2007 15:16:38 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	David Miller <davem@...emloft.net>
cc:	dada1@...mosbay.com, akpm@...ux-foundation.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	mathieu.desnoyers@...ymtl.ca, penberg@...helsinki.fi
Subject: Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu
 access overhead

On Thu, 1 Nov 2007, David Miller wrote:

> From: Christoph Lameter <clameter@....com>
> Date: Thu, 1 Nov 2007 15:11:41 -0700 (PDT)
> 
> > On Thu, 1 Nov 2007, David Miller wrote:
> > 
> > > The remaining issue with accessing per-cpu areas at multiple virtual
> > > addresses is D-cache aliasing.
> > 
> > But that is not an issue for physicallly mapped caches.
> 
> Right but I'd like to use this on sparc64 which has L1 D-cache
> aliasing on some chips :-)

Hmmm... re my message I just send. Then we have to return the memory with 
the virtual address not with the physical address on sparc. May result in 
zones with holes though.

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