[PATCH] mm: do not update memcg stats for NR_{FILE/SHMEM}_PMDMAPPED

From: Yosry Ahmed
Date: Mon May 06 2024 - 13:01:01 EST


Do not use __lruvec_stat_mod_folio() when updating NR_FILE_PMDMAPPED and
NR_SHMEM_PMDMAPPED as these stats are not maintained per-memcg. Use
__mod_node_page_state() instead, which updates the global per-node stats
only.

Reported-by: syzbot+9319a4268a640e26b72b@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://lore.kernel.org/lkml/0000000000001b9d500617c8b23c@xxxxxxxxxx
Signed-off-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
---
mm/rmap.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index 12be4241474ab..c2cfb750d2535 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1435,13 +1435,14 @@ static __always_inline void __folio_add_file_rmap(struct folio *folio,
struct page *page, int nr_pages, struct vm_area_struct *vma,
enum rmap_level level)
{
+ pg_data_t *pgdat = folio_pgdat(folio);
int nr, nr_pmdmapped = 0;

VM_WARN_ON_FOLIO(folio_test_anon(folio), folio);

nr = __folio_add_rmap(folio, page, nr_pages, level, &nr_pmdmapped);
if (nr_pmdmapped)
- __lruvec_stat_mod_folio(folio, folio_test_swapbacked(folio) ?
+ __mod_node_page_state(pgdat, folio_test_swapbacked(folio) ?
NR_SHMEM_PMDMAPPED : NR_FILE_PMDMAPPED, nr_pmdmapped);
if (nr)
__lruvec_stat_mod_folio(folio, NR_FILE_MAPPED, nr);
@@ -1493,6 +1494,7 @@ static __always_inline void __folio_remove_rmap(struct folio *folio,
enum rmap_level level)
{
atomic_t *mapped = &folio->_nr_pages_mapped;
+ pg_data_t *pgdat = folio_pgdat(folio);
int last, nr = 0, nr_pmdmapped = 0;
bool partially_mapped = false;
enum node_stat_item idx;
@@ -1540,13 +1542,14 @@ static __always_inline void __folio_remove_rmap(struct folio *folio,
}

if (nr_pmdmapped) {
+ /* NR_{FILE/SHMEM}_PMDMAPPED are not maintained per-memcg */
if (folio_test_anon(folio))
- idx = NR_ANON_THPS;
- else if (folio_test_swapbacked(folio))
- idx = NR_SHMEM_PMDMAPPED;
+ __lruvec_stat_mod_folio(folio, NR_ANON_THPS, -nr_pmdmapped);
else
- idx = NR_FILE_PMDMAPPED;
- __lruvec_stat_mod_folio(folio, idx, -nr_pmdmapped);
+ __mod_node_page_state(pgdat,
+ folio_test_swapbacked(folio) ?
+ NR_SHMEM_PMDMAPPED : NR_FILE_PMDMAPPED,
+ nr_pmdmapped);
}
if (nr) {
idx = folio_test_anon(folio) ? NR_ANON_MAPPED : NR_FILE_MAPPED;
--
2.45.0.rc1.225.g2a3ae87e7f-goog