Yeah, MADV_DONTNEED looks right. UML and Linux/s390 (assuming VM has the
equivalent of MADV_DONTNEED) would need a hook in free_pages to make that
happen.
> That BTW is an issue for more than UML - it has a bearing on running
> lots of Linux instances on any supervisor/virtualising system like S/390
On a side note, the "unused memory is wasted memory" behavior that UML and
Linux/s390 inherit is also less than optimal for the host.
Jeff
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