[PATCH v4 01/17] mm/memcontrol: allow update of LRU statistic without holding LRU lock

[Kairui Song via B4 Relay]

From: Kairui Song <kasong@xxxxxxxxxxx>

To enable moving file pages in folio_mark_accessed directly and lazily
for MGLRU, allow updating the LRU statistic atomically without holding a
lock. It may cause temporary counter underflow, which should be fine as
we still follow final consistency of the counter, and it only serves as
a estimated metrics, a little inaccuracy has no visible effect.

Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
---
 include/linux/mm_inline.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index ab69b9930893..597f013c8e04 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -47,11 +47,10 @@ static __always_inline void __update_lru_size(struct lruvec *lruvec,
 {
 	struct pglist_data *pgdat = lruvec_pgdat(lruvec);
 
-	lockdep_assert_held(&lruvec->lru_lock);
 	WARN_ON_ONCE(nr_pages != (int)nr_pages);
 
 	mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
-	__mod_zone_page_state(&pgdat->node_zones[zid],
+	mod_zone_page_state(&pgdat->node_zones[zid],
 				NR_ZONE_LRU_BASE + lru, nr_pages);
 }
 

-- 
2.56.0