Re: [PATCH 6/8] mm/vmscan: Use PG_dropbehind instead of PG_reclaim in shrink_folio_list()

[David Hildenbrand]

On 13.01.25 10:34, Kirill A. Shutemov wrote:
> The recently introduced PG_dropbehind allows for freeing folios
> immediately after writeback. Unlike PG_reclaim, it does not need vmscan
> to be involved to get the folio freed.
>
> Instead of using folio_set_reclaim(), use folio_set_dropbehind() in
> shrink_folio_list().
>
> It is safe to leave PG_dropbehind on the folio if, for some reason
> (bug?), the folio is not in a writeback state after ->writepage().
> In these cases, the kernel had to clear PG_reclaim as it shared a page
> flag bit with PG_readahead.
>
> Also use PG_dropbehind instead PG_reclaim to detect I/O congestion.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> ---

Acked-by: David Hildenbrand <david@xxxxxxxxxx>

--
Cheers,

David / dhildenb