Re: [PATCH RESEND percpu#for-next] percpu: align percpu readmostlysubsection to cacheline

From: Tejun Heo
Date: Tue Jan 25 2011 - 08:32:23 EST

On Mon, Dec 27, 2010 at 02:37:19PM +0100, Tejun Heo wrote:
> Currently percpu readmostly subsection may share cachelines with other
> percpu subsections which may result in unnecessary cacheline bounce
> and performance degradation.
> This patch adds @cacheline parameter to PERCPU() and PERCPU_VADDR()
> linker macros, makes each arch linker scripts specify its cacheline
> size and use it to align percpu subsections.
> This is based on Shaohua's x86 only patch.
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
> Cc: Shaohua Li <>
> ---
> Shaohua, can you please verify this achieves the same result? If no
> one objects, I'll route it through the percpu tree.

Applied to percpu#for-2.6.39.


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