On Thu, Jun 01, 2017 at 05:38:38PM +0200, Michal Hocko wrote:
On Thu 01-06-17 10:19:36, Reza Arbab wrote:
The x86 SRAT (or the dt, on other platforms) can describe memory as
hotpluggable. See memblock_mark_hotplug(). That's only for memory present at
boot, though.
Yes but lose that information after the memblock is gone and numa fully
initialized. Or can we reconstruct that somehow?
I'm not sure you'd have to. At boot time, those markings are used to
determine the initial boundaries of ZONE_MOVABLE. So if you removed
these memblocks, then readded them, they would still be in ZONE_MOVABLE.
He's saying that since the memory was added after boot, it is by
definition hotpluggable. There's no need to check for that
marking/description.
Yes, but we do not know whether we are onlining memblocks from a boot
time numa node or a fresh one which has been hotadded.
That's true.
--
Reza Arbab
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