Re: [PATCH] zram: Add a huge_idle writeback mode

[Matthew Wilcox]

On Tue, Mar 15, 2022 at 10:22:21AM -0700, Brian Geffon wrote:
> Today it's only possible to write back as a page, idle, or huge.
> A user might want to writeback pages which are huge and idle first
> as these idle pages do not require decompression and make a good
> first pass for writeback.

We're moving towards having many different sizes of page in play,
not just PMD and PTE sizes.  Is this patch actually a good idea in
a case where we have, eg, a 32kB anonymous page on a system with 4kB
pages?  How should zram handle this case?  What's our cut-off for
declaring a page to be "huge"?