linux-kernel - Re: [this_cpu_xx V4 12/20] Move early initialization of pagesets out of zone_wait_table

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Message-ID: <alpine.DEB.1.10.0910051038410.16359@gentwo.org>
Date:	Mon, 5 Oct 2009 10:39:20 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Tejun Heo <tj@...nel.org>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Mel Gorman <mel@....ul.ie>, mingo@...e.hu,
	rusty@...tcorp.com.au, Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [this_cpu_xx V4 12/20] Move early initialization of pagesets
 out of zone_wait_table_init()

On Sat, 3 Oct 2009, Tejun Heo wrote:

> >  arch/ia64/kernel/setup.c       |    1 +
> >  arch/powerpc/kernel/setup_64.c |    1 +
> >  arch/sparc/kernel/smp_64.c     |    1 +
> >  arch/x86/kernel/setup_percpu.c |    2 ++
> >  include/linux/mm.h             |    1 +
> >  mm/page_alloc.c                |   40 +++++++++++++++++++++++++++++-----------
> >  mm/percpu.c                    |    2 ++
>
> Hmmm... why not call this function from start_kernel() after calling
> setup_per_cpu_areas() instead of modifying every implementation of
> setup_per_cpu_areas()?

Because it has to be called immediately after per cpu areas become
available. Otherwise page allocator uses will fail.

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