On 4/11/23 01:37, Huang, Ying wrote:
Gregory Price <gregory.price@xxxxxxxxxxxx> writes:
[snip]
2. During the migration process, the memory needs to be forced not to be
migrated to another node by other means (tiering software, swap,
etc). The obvious way of doing this would be to migrate and
temporarily pin the page... but going back to problem #1 we see that
ZONE_MOVABLE and Pinning are mutually exclusive. So that's
troublesome.
Can we use memory policy (cpusets, mbind(), set_mempolicy(), etc.) to
avoid move pages out of CXL.mem node? Now, there are gaps in tiering,
but I think it is fixable.
Hmmm, I don't know about cpusets. For mbind, are you thinking something
along the lines of MPOL_MF_MOVE_ALL? I guess it does have that
deterministic placement, but this would have to be called from the
process itself. Unlike migrate_pages which takes a pid.
Same for set_mempolicy, right?
I mean I guess, if some of this needs to be added into qemu it's not the
end of the word...
Best Regards,
Huang, Ying
[snip]
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