As we know, shmem not only supports the sharing of anonymous pages, but also
the RAM-based temporary filesystem. Therefore, shmem swapouts should not be
marked as anonymous swapout statistics. Fix it by adding folio_test_anon().
Fixes: d0f048ac39f6 ("mm: add per-order mTHP anon_swpout and anon_swpout_fallback counters")
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
---
mm/page_io.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/page_io.c b/mm/page_io.c
index 46c603dddf04..b181b81f39e3 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -217,7 +217,9 @@ static inline void count_swpout_vm_event(struct folio *folio)
count_memcg_folio_events(folio, THP_SWPOUT, 1);
count_vm_event(THP_SWPOUT);
}
- count_mthp_stat(folio_order(folio), MTHP_STAT_ANON_SWPOUT);
+
+ if (folio_test_anon(folio))
+ count_mthp_stat(folio_order(folio), MTHP_STAT_ANON_SWPOUT);
#endif
count_vm_events(PSWPOUT, folio_nr_pages(folio));
}
--
2.39.3
