On 01/29/2013 01:45 AM, Luck, Tony wrote:
I will post a patch to fix it. How about always keep node0 unhotpluggable ?
Node 0 (or more specifically the node that contains memory<4GB) will be
full of BIOS reserved holes in the memory map.
Hi Tony,
One thing I'm not sure, is memory<4GB always on node 0 ?
On my box, it is on node 0.
But since node id is 1-1 mapped to PXM in SRAT, if SRAT entries are not
ordered by
physical address, memory<4GB may not on node 0. I think this is
something related
to firmware. i didn't find anything about the order problem in ACPI
specification.
So, do we just check if the node id != 0, or we need to check if we have
reserved
enough for kernel, such as 4GB ?
Thanks. :)
It probably isn't removable
even if Linux thinks it is. Someday we might have a smart BIOS that can
relocate itself to another node - but for now making node0 unhotpluggable
looks to be a plausible interim move.
Ultimately we'd like to be able to remove any node (just not all of them at
the same time ... just like we can now offline any cpu - but not all of them
together).
-Tony
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