Hi Yu Zhao,
Thanks for your reply.
在 2023/10/19 0:21, Yu Zhao 写道:
On Wed, Oct 18, 2023 at 2:22 AM Huan Yang <link@xxxxxxxx> wrote:
For multi-gen lru reclaim in evict_folios, like shrink_inactive_list,
gather folios which isolate to reclaim, and invoke shirnk_folio_list.
But, when complete shrink, it not gather shrink reclaim stat into sc,
we can't get info like nr_dirty\congested in reclaim, and then
control writeback, dirty number and mark as LRUVEC_CONGESTED, or
just bpf trace shrink and get correct sc stat.
This patch fix this by simple copy code from shrink_inactive_list when
end of shrink list.
MGLRU doesn't try to write back dirt file pages in the reclaim path --
it filters them out in sort_folio() and leaves them to the page
Nice to know this, sort_folio() filters some folio indeed.
But, I want to know, if we touch some folio in shrink_folio_list(), may some
folio become dirty or writeback even if sort_folio() filter then?
writeback. (The page writeback is a dedicated component for this
purpose). So there is nothing to fix.
