linux-kernel - Re: PS3: trouble with SPARSEMEM

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Date:	Thu, 6 Dec 2007 10:55:35 +0100 (CET)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Yasunori Goto <y-goto@...fujitsu.com>
cc:	Geoff Levand <geoffrey.levand@...sony.com>,
	Andrew Morton <akpm@...ux-foundation.org>, miltonm@....com,
	clameter@....com, apw@...dowen.org, linux-kernel@...r.kernel.org
Subject: Re: PS3: trouble with SPARSEMEM_VMEMMAP and kexec

On Thu, 6 Dec 2007, Geert Uytterhoeven wrote:
> On Thu, 6 Dec 2007, Yasunori Goto wrote:
> > > I'll try Milton's suggestion to pre-allocate the memory early.  It seems
> > > that should work as long as nothing else before the hot-plug mem is added
> > > needs a large chunk.
> > 
> > Hello. Geoff-san. Sorry for late response.
> > 
> > Could you tell me the value of the following page_size calculation
> > in vmemmap_populate()? I think this page_size may be too big value. 
> > 
> > ------
> > int __meminit vmemmap_populate(struct page *start_page,
> >                                        unsigned long nr_pages, int node)
> >                            :
> >                            :
> >         unsigned long page_size = 1 << mmu_psize_defs[mmu_linear_psize].shift;
> >                            :
> > -------
> 
> 24 MiB

Bummer, messing up bits and MiB.

16 MiB of course.

With kind regards,
 
Geert Uytterhoeven
Software Architect

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