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Date: Thu, 06 Dec 2007 19:48:11 +0900 From: Yasunori Goto <y-goto@...fujitsu.com> To: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.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. 16 MiB is not page size. It is "section size". IIRC, powerpc's page size must be 4K (or 64K). If page size is 4k, vmemmap_alloc_block will call the order 12 page. Is it really correct value for vmemmap population? > PS3 initially starts with 128 MiB. > Later hotplug is used to add the remaining memory (96 or 112 MIB, IIRC). Ok. Then, add_memory() must be called 6 or 7 times for each sections. Thanks. -- Yasunori Goto -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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