linux-kernel - Re: [PATCH 2/2] Call percpu smp cacheline algin interface

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Message-Id: <20070509133328.c79ef48e.akpm@linux-foundation.org>
Date:	Wed, 9 May 2007 13:33:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Fenghua Yu <fenghua.yu@...el.com>
Cc:	suresh.b.siddha@...el.com, linux-kernel@...r.kernel.org,
	clameter@....com
Subject: Re: [PATCH 2/2] Call percpu smp cacheline algin interface

On Mon, 7 May 2007 15:59:44 -0700
Fenghua Yu <fenghua.yu@...el.com> wrote:

> On Fri, May 04, 2007 at 05:12:31PM -0700, Fenghua Yu wrote:
> > 
> > Call percpu smp cacheline align interface.
> > 
> 
> This is updated patch. Use new macro name DEFINE_PER_CPU_SHARED_CACHELINE_ALIGNED for better code understanding.
> 
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> Acked-by: Suresh Siddha <suresh.b.siddha@...el.com>

hm, DEFINE_PER_CPU_SHARED_CACHELINE_ALIGNED is a bit of a mouthful.

I wonder if we can improve things here so that we use the runtime-detected
cacheline size rather than the compile-time size.  I guess not, given that
the offsets into the percpu area are calculated at build-time.

Did you work out how much space this change will actually save?  It
should be available by suitable crunching on the nm and objdump output.
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