Blocking does not work.
But I have an idea, whatabout:
- CPU add rule which only adds a CPU if the corresponding Numa node already
has onlined memory
- Memory add rule which adds the memory and also onlines CPUs if the Numa
node still has offlined CPUs
This has the side effect that you online a CPU which may have been offlined on
purpose if you hotadd memory on the same node..., a rather uncommon case.
That actually might be more of a problem than you think. It's not
atypical that in the evening a system's components are offlined in order
to save power. Maintenance also is scheduled for downtime so when
memory is added to the system we may bring cpus into service
erroneously. I think the "end-user" may not be too happy with this result.
[OTOH, a little documentation could fix that issue]
A quick try showed that it would be convenient to add the Numa node to the
uevent which is a bit tricky...
Ok, I got this working, but messed up the cpu hotplugging with my patches:
...
Unable to map lapic 32 to logical cpu number
...
This already worked...
I wanted to post something today, but I couldn't made it.
Still I more or less could prove that above works and I hopefully can show
some results on Monday.
If it works then I'm all for it :)
Comments?
Thomas
BTW: I was wrong with slub. It also has bad side effects. What is strange is
FWIW, I'm testing with slab.
P.
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