3 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index c75024e80eed..e02820fc2861 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -86,6 +86,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
                 THP_ZERO_PAGE_ALLOC,
                 THP_ZERO_PAGE_ALLOC_FAILED,
                 THP_SWPOUT,
+                THP_SWPOUT_FALLBACK,
 #endif
 #ifdef CONFIG_MEMORY_BALLOON
                 BALLOON_INFLATE,
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6fbf707c0ce2..13d711dd8776 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1154,6 +1154,9 @@ static unsigned long shrink_page_list(struct list_head *page_list,
                                         if (split_huge_page_to_list(page,
                                                                     page_list))
                                                 goto activate_locked;
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+                                        count_vm_event(THP_SWPOUT_FALLBACK);
+#endif
                                         if (!add_to_swap(page))
                                                 goto activate_locked;
                                 }
diff --git a/mm/vmstat.c b/mm/vmstat.c
index bccf426453cd..e131b51654c7 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1072,6 +1072,7 @@ const char * const vmstat_text[] = {
         "thp_zero_page_alloc",
         "thp_zero_page_alloc_failed",
         "thp_swpout",
+        "thp_swpout_fallback",
 #endif
 #ifdef CONFIG_MEMORY_BALLOON
         "balloon_inflate",