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    SubjectRe: [PATCH v10] mm: vmscan: try to reclaim swapcache pages if no swap space
    On Mon 27-11-23 10:34:46, Huang, Ying wrote:
    > Michal Hocko <mhocko@suse.com> writes:
    >
    > > 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?
    >
    > This just means that anonymous pages in file LRU aren't temporary or
    > short-term. So we need to consider that.

    Right. On the other hand we could be more aggressive when dropping the
    swapcache. Is there any actual reason why we cannot try to folio_free_swap
    even when mem_cgroup_swap_full == F?
    --
    Michal Hocko
    SUSE Labs

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