Re: [RFC] autonuma: Support to scan page table asynchronously

SeongJae Park [off-list ref] writes:

DAMON allows users to know which address ranges have which access frequency.
Thus, I think DAMON could be used for detection of hot pages, which will be
good migration candidates, instead of the NUMA hinting fault based referenced
pages detection.

The benefits I expect from this change are better accuracy and less overhead.
As we can know not only referenced pages but hot pages, migration will be more
effective.

The purpose of AutoNUMA scanning isn't to find the hot pages, but the
pages that are accessed across NUMA node.  PTE accessed bit cannot
provide information of accessing CPU, so it's not enough for AutoNUMA.

Best Regards,
Huang, Ying