Re: [PATCH v10] mm: vmscan: try to reclaim swapcache pages if no swap space

Michal Hocko
2023-11-24T16:30:55Z

On Thu 23-11-23 14:15:59, Huang, Ying wrote:
> Michal Hocko <mhocko@suse.com> writes:
[...]
> > Yes swapcache pages are indeed more complicated but most of the time
> > they just go away as well, no?
>
> When we swapin a page, we will put it in swapcache too. And the page
> can be in that state for long time if there is more than 50% free space
> in the swap device.

True, but why is that a problem? If you encounter such a swapped in page
on the file LRU then the page should be referened and as such should be
activated, no?
--
Michal Hocko
SUSE Labs