On 04/23/2015 11:03 PM, Kirill A. Shutemov wrote:
The patch replaces THP_SPLIT with tree events: THP_SPLIT_PAGE,
THP_SPLIT_PAGE_FAILT 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: 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 ccbfacf07160..be6d0e0f5050 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1961,7 +1961,7 @@ 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
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