Re: [PATCH v14 081/138] mm: Add folio_evictable()

Matthew Wilcox (Oracle) [off-list ref] wrote:

This is the folio equivalent of page_evictable().  Unfortunately, it's
different from !folio_test_unevictable(), but I think it's used in places
where you have to be a VM expert and can reasonably be expected to know
the difference.

It would be useful to say how it is different.  I'm guessing it's because a
page is always entirely mlocked or not, but a folio might be partially
mlocked?

David