diff mbox series

[v2,3/3] mm-unstable: Multi-gen LRU: Fix can_swap in lru_gen_look_around()

Message ID 20230802025606.346758-3-kaleshsingh@google.com (mailing list archive)
State New, archived
Headers show
Series [v2,1/3] mm-unstable: Multi-gen LRU: Fix per-zone reclaim | expand

Commit Message

Kalesh Singh Aug. 2, 2023, 2:56 a.m. UTC 
walk->can_swap might be invalid since it's not guaranteed to be
initialized for the particular lruvec. Instead deduce it from the folio
type (anon/file).

Fixes: 018ee47f1489 ("mm: multi-gen LRU: exploit locality in rmap")
Cc: Yu Zhao <yuzhao@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
---

Changes in v2:
  - Add Fixes tag

 mm/vmscan.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6eecd291756c..b4329f93a682 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -4656,6 +4656,7 @@  void lru_gen_look_around(struct page_vma_mapped_walk *pvmw)
 	pte_t *pte = pvmw->pte;
 	unsigned long addr = pvmw->address;
 	struct folio *folio = pfn_folio(pvmw->pfn);
+	bool can_swap = !folio_is_file_lru(folio);
 	struct mem_cgroup *memcg = folio_memcg(folio);
 	struct pglist_data *pgdat = folio_pgdat(folio);
 	struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat);
@@ -4704,7 +4705,7 @@  void lru_gen_look_around(struct page_vma_mapped_walk *pvmw)
 		if (!pte_young(ptent))
 			continue;
 
-		folio = get_pfn_folio(pfn, memcg, pgdat, !walk || walk->can_swap);
+		folio = get_pfn_folio(pfn, memcg, pgdat, can_swap);
 		if (!folio)
 			continue;