[PATCHv2 01/11] mm/migrate: Transfer PG_dropbehind to the new folio
From: Kirill A. Shutemov <hidden>
Date: 2025-01-15 09:31:52
Also in:
linux-fsdevel, lkml
Subsystem:
memory management, memory management - migration, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
Do not lose the flag on page migration. Ideally, these folios should be freed instead of migration. But it requires to find right spot do this and proper testing. Transfer the flag for now. Signed-off-by: Kirill A. Shutemov <redacted> --- mm/migrate.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/mm/migrate.c b/mm/migrate.c
index caadbe393aa2..690efa064bee 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c@@ -682,6 +682,10 @@ void folio_migrate_flags(struct folio *newfolio, struct folio *folio) if (folio_test_dirty(folio)) folio_set_dirty(newfolio); + /* TODO: free the folio on migration? */ + if (folio_test_dropbehind(folio)) + folio_set_dropbehind(newfolio); + if (folio_test_young(folio)) folio_set_young(newfolio); if (folio_test_idle(folio))
--
2.45.2