[RFC PATCH v4 12/16] mm/mglru: run aging if the preferred type has no reclaimable gens

["Barry Song (Xiaomi)" <baohua@kernel.org>]

Respect the type selected by get_type_to_scan(). If there are no
reclaimable gens left for that type, run aging.

Signed-off-by: Barry Song (Xiaomi) <baohua@kernel.org>
---
 mm/vmscan.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 48a068b50678..50f0bcf9576c 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -5095,12 +5095,17 @@ static int evict_folios(unsigned long nr_to_scan, struct lruvec *lruvec,
 static bool should_run_aging(struct lruvec *lruvec, unsigned long max_seq,
 			     struct scan_control *sc, int swappiness)
 {
+	int type = get_type_to_scan(lruvec, swappiness);
 	DEFINE_MIN_SEQ(lruvec);
 
 	/* have to run aging, since eviction is not possible anymore */
 	if (evictable_min_seq(min_seq, swappiness) + MIN_NR_GENS > max_seq)
 		return true;
 
+	/* run aging if the preferred type is exhausted */
+	if (min_seq[type] + MIN_NR_GENS > max_seq)
+		return true;
+
 	/*
 	 * Try to avoid aging by doing gentle reclaim at the default
 	 * priority. Skip gentle reclaim for extreme swappiness.
-- 
2.34.1