[RFC PATCH v1 7/7] mm: multi-gen LRU: Shrink folio list without checking for page table reference

["Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>]

If arch supports page access count, we would have already sorted the lru
before collecting reclaimable pages. So unconditionally reclaim them in
shrink_folio_list

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
 mm/vmscan.c | 25 ++++++++-----------------
 1 file changed, 8 insertions(+), 17 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a5f6238b3926..d9eb6a4d2975 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -5242,7 +5242,8 @@ static int evict_folios(struct lruvec *lruvec, struct scan_control *sc, int swap
 	if (list_empty(&list))
 		return scanned;
 retry:
-	reclaimed = shrink_folio_list(&list, pgdat, sc, &stat, false);
+	reclaimed = shrink_folio_list(&list, pgdat, sc,
+				      &stat, arch_supports_page_access_count());
 	sc->nr_reclaimed += reclaimed;
 
 	list_for_each_entry_safe_reverse(folio, next, &list, lru) {
@@ -5477,22 +5478,12 @@ bool lru_gen_add_folio(struct lruvec *lruvec, struct folio *folio, bool reclaimi
 	 */
 	if (folio_test_active(folio))
 		seq = lrugen->max_seq;
-	else {
-		/*
-		 * For a non active folio use the arch based
-		 * aging details to derive the MGLRU generation.
-		 */
-		seq = arch_get_lru_gen_seq(lruvec, folio);
-
-		if (seq == lrugen->min_seq[type]) {
-			if ((type == LRU_GEN_ANON &&
-			     !folio_test_swapcache(folio)) ||
-			    (folio_test_reclaim(folio) &&
-			     (folio_test_dirty(folio) ||
-			      folio_test_writeback(folio))))
-				seq = lrugen->min_seq[type] + 1;
-		}
-	}
+	else if ((type == LRU_GEN_ANON && !folio_test_swapcache(folio)) ||
+		 (folio_test_reclaim(folio) &&
+		  (folio_test_dirty(folio) || folio_test_writeback(folio))))
+		seq = lrugen->min_seq[type] + 1;
+	else
+		seq = lrugen->min_seq[type];
 
 	gen = lru_gen_from_seq(seq);
 	flags = (gen + 1UL) << LRU_GEN_PGOFF;
-- 
2.39.2