linux-kernel - Re: [PATCH RESEND percpu#for-next] percpu: align percpu readmostly subsection to cacheline

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Message-ID: <4D18F475.8090604@zytor.com>
Date:	Mon, 27 Dec 2010 12:17:57 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Shaohua Li <shaohua.li@...el.com>, Sam Ravnborg <sam@...nborg.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	eric.dumazet@...il.com, linux-arch@...r.kernel.org
Subject: Re: [PATCH RESEND percpu#for-next] percpu: align percpu readmostly
 subsection to cacheline

On 12/27/2010 05:37 AM, 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@...nel.org>
> Cc: Shaohua Li <shaohua.li@...el.com>
> ---
> Shaohua, can you please verify this achieves the same result?  If no
> one objects, I'll route it through the percpu tree.
> 

For x86:

Acked-by: H. Peter Anvin <hpa@...or.com>
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