[RFC PATCH 5/5] mm: shmem: add anonymous share mTHP counters

[Baolin Wang]

Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
---
 include/linux/huge_mm.h | 2 ++
 mm/huge_memory.c        | 4 ++++
 mm/shmem.c              | 5 ++++-
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 26b6fa98d8ac..67b9c1acad31 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -270,6 +270,8 @@ enum mthp_stat_item {
 	MTHP_STAT_ANON_SWPOUT,
 	MTHP_STAT_ANON_SWPOUT_FALLBACK,
 	MTHP_STAT_ANON_SWPIN_REFAULT,
+	MTHP_STAT_SHMEM_ANON_ALLOC,
+	MTHP_STAT_SHMEM_ANON_ALLOC_FALLBACK,
 	__MTHP_STAT_COUNT
 };
 
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 9e52c0db7580..dc15240c1ab3 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -557,6 +557,8 @@ DEFINE_MTHP_STAT_ATTR(anon_alloc_fallback, MTHP_STAT_ANON_ALLOC_FALLBACK);
 DEFINE_MTHP_STAT_ATTR(anon_swpout, MTHP_STAT_ANON_SWPOUT);
 DEFINE_MTHP_STAT_ATTR(anon_swpout_fallback, MTHP_STAT_ANON_SWPOUT_FALLBACK);
 DEFINE_MTHP_STAT_ATTR(anon_swpin_refault, MTHP_STAT_ANON_SWPIN_REFAULT);
+DEFINE_MTHP_STAT_ATTR(shmem_anon_alloc, MTHP_STAT_SHMEM_ANON_ALLOC);
+DEFINE_MTHP_STAT_ATTR(shmem_anon_alloc_fallback, MTHP_STAT_SHMEM_ANON_ALLOC_FALLBACK);
 
 static struct attribute *stats_attrs[] = {
 	&anon_alloc_attr.attr,
@@ -564,6 +566,8 @@ static struct attribute *stats_attrs[] = {
 	&anon_swpout_attr.attr,
 	&anon_swpout_fallback_attr.attr,
 	&anon_swpin_refault_attr.attr,
+	&shmem_anon_alloc_attr.attr,
+	&shmem_anon_alloc_fallback_attr.attr,
 	NULL,
 };
 
diff --git a/mm/shmem.c b/mm/shmem.c
index 8b009e7040b2..4a0aa75ab29c 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1706,11 +1706,14 @@ static struct folio *shmem_alloc_and_add_folio(struct vm_fault *vmf,
 			pages = 1 << order;
 			index = round_down(index, pages);
 			folio = shmem_alloc_hugefolio(gfp, info, index, order);
-			if (folio)
+			if (folio) {
+				count_mthp_stat(order, MTHP_STAT_SHMEM_ANON_ALLOC);
 				goto allocated;
+			}
 
 			if (pages == HPAGE_PMD_NR)
 				count_vm_event(THP_FILE_FALLBACK);
+			count_mthp_stat(order, MTHP_STAT_SHMEM_ANON_ALLOC_FALLBACK);
 			order = next_order(&orders, order);
 		}
 	} else {
-- 
2.39.3