linux-kernel - Re: [patch 2/3] add new macros to make percpu readmostly section correctly align

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Message-ID: <20101228111332.GE488@htj.dyndns.org>
Date:	Tue, 28 Dec 2010 12:13:32 +0100
From:	Tejun Heo <htejun@...il.com>
To:	Shaohua Li <shaohua.li@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>
Subject: Re: [patch 2/3] add new macros to make percpu readmostly section
 correctly align

Hello,

On Tue, Dec 28, 2010 at 08:26:57AM +0800, Shaohua Li wrote:
> Subject: make readmostly section correctly align
> 
> readmostly section should end at cache line aligned address, otherwise the last
> several data might share cachline with other data and make the readmostly data
> still have cache bounce.
> For example, in ia64, secpath_cachep is the last readmostly data, and it shares
> cacheline with init_uts_ns.
> a000000100e80480 d secpath_cachep
> a000000100e80488 D init_uts_ns
> 
> Signed-off-by: Shaohua Li <shaohua.li@...el.com>

Yeap, this looks good to me.

 Acked-by: Tejun Heo <tj@...nel.org>

I can route this through percpu tree but think -mm is the better fit.
Andrew, can you please take this one?

Thank you.

-- 
tejun
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