[PATCH 5/8] mm/mglru: use a smaller batch for reclaim

Kairui Song via B4 Relay
2026-03-17T19:12:00Z

From: Kairui Song <kasong@tencent.com>

With a fixed number to reclaim calculated at the beginning, making each
following step smaller should reduce the lock contention and avoid
over-aggressive reclaim of folios, as it will abort earlier when the
number of folios to be reclaimed is reached.

Signed-off-by: Kairui Song <kasong@tencent.com>
---
mm/vmscan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 4f4548ff3a17..2ff1609ff4de 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -5007,7 +5007,7 @@ static bool try_to_shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc)
break;
}

- nr_batch = min(nr_to_scan, MAX_LRU_BATCH);
+ nr_batch = min(nr_to_scan, MIN_LRU_BATCH);
delta = evict_folios(nr_batch, lruvec, sc, swappiness);
if (!delta)
break;

--
2.53.0