[PATCHv7 10/36] mm, vmstats: new THP splitting event

[Kirill A. Shutemov]

The patch replaces THP_SPLIT with tree events: THP_SPLIT_PAGE,
THP_SPLIT_PAGE_FAILED and THP_SPLIT_PMD. It reflects the fact that we
are going to be able split PMD without the compound page and that
split_huge_page() can fail.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Acked-by: Christoph Lameter <cl@xxxxxxxxx>
Tested-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
Acked-by: Jerome Marchand <jmarchan@xxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
---
 include/linux/vm_event_item.h | 4 +++-
 mm/huge_memory.c              | 2 +-
 mm/vmstat.c                   | 4 +++-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 2b1cef88b827..3261bfe2156a 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -69,7 +69,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
 		THP_FAULT_FALLBACK,
 		THP_COLLAPSE_ALLOC,
 		THP_COLLAPSE_ALLOC_FAILED,
-		THP_SPLIT,
+		THP_SPLIT_PAGE,
+		THP_SPLIT_PAGE_FAILED,
+		THP_SPLIT_PMD,
 		THP_ZERO_PAGE_ALLOC,
 		THP_ZERO_PAGE_ALLOC_FAILED,
 #endif
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 2374dbb57c44..cdc3a358eb17 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1986,7 +1986,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
 
 	BUG_ON(!PageSwapBacked(page));
 	__split_huge_page(page, anon_vma, list);
-	count_vm_event(THP_SPLIT);
+	count_vm_event(THP_SPLIT_PAGE);
 
 	BUG_ON(PageCompound(page));
 out_unlock:
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 1fd0886a389f..e1c87425fe11 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -821,7 +821,9 @@ const char * const vmstat_text[] = {
 	"thp_fault_fallback",
 	"thp_collapse_alloc",
 	"thp_collapse_alloc_failed",
-	"thp_split",
+	"thp_split_page",
+	"thp_split_page_failed",
+	"thp_split_pmd",
 	"thp_zero_page_alloc",
 	"thp_zero_page_alloc_failed",
 #endif
-- 
2.1.4

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