[PATCH v2 7/7] mm: shmem: add mTHP counters for anonymous shmem

[Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>]

Add mTHP counters for anonymous shmem.

Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
---
 include/linux/huge_mm.h |  3 +++
 mm/huge_memory.c        |  6 ++++++
 mm/shmem.c              | 18 +++++++++++++++---
 3 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index b5339210268d..e162498fef82 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -281,6 +281,9 @@ enum mthp_stat_item {
 	MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
 	MTHP_STAT_ANON_SWPOUT,
 	MTHP_STAT_ANON_SWPOUT_FALLBACK,
+	MTHP_STAT_FILE_ALLOC,
+	MTHP_STAT_FILE_FALLBACK,
+	MTHP_STAT_FILE_FALLBACK_CHARGE,
 	__MTHP_STAT_COUNT
 };
 
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index d3080a8843f2..fcda6ae604f6 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -555,6 +555,9 @@ DEFINE_MTHP_STAT_ATTR(anon_fault_fallback, MTHP_STAT_ANON_FAULT_FALLBACK);
 DEFINE_MTHP_STAT_ATTR(anon_fault_fallback_charge, MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE);
 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(file_alloc, MTHP_STAT_FILE_ALLOC);
+DEFINE_MTHP_STAT_ATTR(file_fallback, MTHP_STAT_FILE_FALLBACK);
+DEFINE_MTHP_STAT_ATTR(file_fallback_charge, MTHP_STAT_FILE_FALLBACK_CHARGE);
 
 static struct attribute *stats_attrs[] = {
 	&anon_fault_alloc_attr.attr,
@@ -562,6 +565,9 @@ static struct attribute *stats_attrs[] = {
 	&anon_fault_fallback_charge_attr.attr,
 	&anon_swpout_attr.attr,
 	&anon_swpout_fallback_attr.attr,
+	&file_alloc_attr.attr,
+	&file_fallback_attr.attr,
+	&file_fallback_charge_attr.attr,
 	NULL,
 };
 
diff --git a/mm/shmem.c b/mm/shmem.c
index 8b020ff09c72..fd2cb2e73a21 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1786,6 +1786,9 @@ static struct folio *shmem_alloc_and_add_folio(struct vm_fault *vmf,
 
 			if (pages == HPAGE_PMD_NR)
 				count_vm_event(THP_FILE_FALLBACK);
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+			count_mthp_stat(order, MTHP_STAT_FILE_FALLBACK);
+#endif
 			order = next_order(&suitable_orders, order);
 		}
 	} else {
@@ -1805,9 +1808,15 @@ static struct folio *shmem_alloc_and_add_folio(struct vm_fault *vmf,
 		if (xa_find(&mapping->i_pages, &index,
 				index + pages - 1, XA_PRESENT)) {
 			error = -EEXIST;
-		} else if (pages == HPAGE_PMD_NR) {
-			count_vm_event(THP_FILE_FALLBACK);
-			count_vm_event(THP_FILE_FALLBACK_CHARGE);
+		} else if (pages > 1) {
+			if (pages == HPAGE_PMD_NR) {
+				count_vm_event(THP_FILE_FALLBACK);
+				count_vm_event(THP_FILE_FALLBACK_CHARGE);
+			}
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+			count_mthp_stat(folio_order(folio), MTHP_STAT_FILE_FALLBACK);
+			count_mthp_stat(folio_order(folio), MTHP_STAT_FILE_FALLBACK_CHARGE);
+#endif
 		}
 		goto unlock;
 	}
@@ -2178,6 +2187,9 @@ static int shmem_get_folio_gfp(struct inode *inode, pgoff_t index,
 		if (!IS_ERR(folio)) {
 			if (folio_test_pmd_mappable(folio))
 				count_vm_event(THP_FILE_ALLOC);
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+			count_mthp_stat(folio_order(folio), MTHP_STAT_FILE_ALLOC);
+#endif
 			goto alloced;
 		}
 		if (PTR_ERR(folio) == -EEXIST)
-- 
2.39.3