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Date: Sat, 5 May 2007 09:52:27 -0700 (PDT)
From: Christoph Lameter <clameter@....com>
To: Fenghua Yu <fenghua.yu@...el.com>
cc: akpm@...ux-foundation.org, suresh.b.siddha@...el.com,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Add percpu smp cacheline align section
On Fri, 4 May 2007, Fenghua Yu wrote:
> This is follow-up for Suresh's runqueue align in smp patch at:
> http://www.uwsg.iu.edu/hypermail/linux/kernel/0704.1/0340.html
>
> The patches place all of smp cacheline aligned percpu data into
> .data.percpu.cacheline_aligned_in_smp. Other percpu data is still in
> data.percpu section. The patches can reduce cache line access in SMP and
> reduce alignment gap waste. The patches also define PERCPU macro for
> vmlinux.lds.S for code clean up.
Ummm... The per cpu area is for exclusive use of a particular processor.
If there is contention in the per cpu area then a data object needs to be
removed from the per cpu area because the object is *not* accessed only
from a certain cpu.
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