On Tue, Jul 11, 2023 at 02:11:19PM -0700, Luis Chamberlain wrote: > On Fri, Jul 07, 2023 at 02:12:01PM +0100, Matthew Wilcox wrote: > > On Fri, Jul 07, 2023 at 01:40:53PM +0200, David Hildenbrand wrote: > > > > > Is swapping working as expected? zswap? > > > > Suboptimally. Swap will split folios in order to swap them. > > Wouldn't that mean if high order folios are used a lot but swap is also > used, until this is fixed you wouldn't get the expected reclaim gains > for high order folios and we'd need compaction more then? They're split in shrink_folio_list(), so they stay intact until that point? > > Somebody needs to fix that, but it should work. > > As we look at shmem stuff it was on the path so something we have > considered doing. Ie, it's on our team's list of items to help with > but currently on a backburner. Something I was thinking about is that you'll need to prohibit swap devices or swap files being created on large block devices. Until we rewrite the entire swap subsystem ...
