[PATCH v4 06/14] mm/mglru: use a smaller batch for reclaim

[Kairui Song via B4 Relay]

From: Kairui Song <kasong@xxxxxxxxxxx>

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.

Reviewed-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
Reviewed-by: Chen Ridong <chenridong@xxxxxxxxxxxxxxx>
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index d3fd5bb56cce..c673830f4ba8 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -5003,7 +5003,7 @@ 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