Messages in this thread | | | Date | Fri, 9 Dec 2005 16:16:41 -0800 | From | Keith Mannthey <> | Subject | Re: [patch 3/3] add x86-64 support for memory hot-add |
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> These should be all __cpuinit. > > In general SRAT has a hotplug memory bit so it's possible > to predict how much memory there will be in advance. Since > the overhead of the kernel page tables should be very > low I would prefer if you just used instead.
How much overhead would there be?
> (i.e. instead of extending the kernel mapping preallocate > the direct mapping and just clear the P bits)
On my box the SRAT for hot-add areas exposed are from the end installed memory to way out in outerspace. SRAT: hot plug zone found 280000000 - 2300000000 I can't hot add that sort of range on my box but the bios didn't want to limit or is planing for really really big dimms.
I wouldn't want to waste resource for areas that will never be added.
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