[PATCH v6 1/9] mm: Allow deferred splitting of arbitrary anon large folios
David Hildenbrand
david at redhat.com
Thu Oct 5 01:19:06 PDT 2023
On 29.09.23 13:44, Ryan Roberts wrote:
> In preparation for the introduction of large folios for anonymous
> memory, we would like to be able to split them when they have unmapped
> subpages, in order to free those unused pages under memory pressure. So
> remove the artificial requirement that the large folio needed to be at
> least PMD-sized.
>
> Reviewed-by: Yu Zhao <yuzhao at google.com>
> Reviewed-by: Yin Fengwei <fengwei.yin at intel.com>
> Reviewed-by: Matthew Wilcox (Oracle) <willy at infradead.org>
> Reviewed-by: David Hildenbrand <david at redhat.com>
> Signed-off-by: Ryan Roberts <ryan.roberts at arm.com>
> ---
> mm/rmap.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/rmap.c b/mm/rmap.c
> index 9f795b93cf40..8600bd029acf 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -1446,11 +1446,11 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma,
> __lruvec_stat_mod_folio(folio, idx, -nr);
>
> /*
> - * Queue anon THP for deferred split if at least one
> + * Queue anon large folio for deferred split if at least one
> * page of the folio is unmapped and at least one page
> * is still mapped.
> */
> - if (folio_test_pmd_mappable(folio) && folio_test_anon(folio))
> + if (folio_test_large(folio) && folio_test_anon(folio))
> if (!compound || nr < nr_pmdmapped)
> deferred_split_folio(folio);
> }
This patch can be picked up early I think.
--
Cheers,
David / dhildenb
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