> In preparation for the introduction of anonymous small-sized THP, 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@xxxxxxxxxx> > Reviewed-by: Yin Fengwei <fengwei.yin@xxxxxxxxx> > Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> > Reviewed-by: David Hildenbrand <david@xxxxxxxxxx> > Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx> > --- Reviewed-by: Barry Song <v-songbaohua@xxxxxxxx> > mm/rmap.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/mm/rmap.c b/mm/rmap.c > index 7a27a2b41802..49e4d86a4f70 100644 > --- a/mm/rmap.c > +++ b/mm/rmap.c > @@ -1488,11 +1488,11 @@ 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); > } > -- > 2.25.1 Thanks Barry
