# \[PATCH v2 14/26\] mm/fbatch: no lru\_add\_drain() nor \_all() for memfd\_wait\_for\_pins() - From: Hugh Dickins \ - Date: 2026-09-09 10:10:25 - List: lkml - Page: https://ratatoskr.run/lkml/2026/09/17536985 - Thread: https://ratatoskr.run/linux-block/2026/09/17536725/t.md ```text memfd_tag_pins() used lru_add_drain(), memfd_wait_for_pins() then used lru_add_drain_all(): remove those calls, no longer useful now that the per-cpu fbatch references are gone. Signed-off-by: Hugh Dickins --- mm/memfd.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/mm/memfd.c b/mm/memfd.c index c708d92533f4..064f24dcddaa 100644 --- a/mm/memfd.c +++ b/mm/memfd.c @@ -40,8 +40,6 @@ static void memfd_tag_pins(struct xa_state *xas) struct folio *folio; int latency = 0; - lru_add_drain(); - xas_lock_irq(xas); xas_for_each(xas, folio, ULONG_MAX) { if (!xa_is_value(folio) && memfd_folio_has_extra_refs(folio)) @@ -168,9 +166,7 @@ static int memfd_wait_for_pins(struct address_space *mapping) if (!xas_marked(&xas, MEMFD_TAG_PINNED)) break; - if (!scan) - lru_add_drain_all(); - else if (schedule_timeout_killable((HZ << scan) / 200)) + if (scan && schedule_timeout_killable((HZ << scan) / 200)) scan = LAST_SCAN; xas_set(&xas, 0); -- 2.51.0 ```