Counts how many times we put a THP in split queue. Currently, it happens
on partial unmap of a THP.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
include/linux/vm_event_item.h | 1 +
mm/huge_memory.c | 1 +
mm/vmstat.c | 1 +
3 files changed, 3 insertions(+)
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 67c1dbd19c6d..b79e831006b0 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -71,6 +71,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
THP_COLLAPSE_ALLOC_FAILED,
THP_SPLIT_PAGE,
THP_SPLIT_PAGE_FAILED,
+ THP_DEFERRED_SPLIT_PAGE,
THP_SPLIT_PMD,
THP_ZERO_PAGE_ALLOC,
THP_ZERO_PAGE_ALLOC_FAILED,
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index c13ced03a2c5..db244d6a6feb 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -3403,6 +3403,7 @@ void deferred_split_huge_page(struct page *page)
spin_lock_irqsave(&pgdata->split_queue_lock, flags);
if (list_empty(page_deferred_list(page))) {
+ count_vm_event(THP_DEFERRED_SPLIT_PAGE);
list_add_tail(page_deferred_list(page), &pgdata->split_queue);
pgdata->split_queue_len++;
}
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 69ce64f7b8d7..05c6ba2534fe 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -847,6 +847,7 @@ const char * const vmstat_text[] = {
"thp_collapse_alloc_failed",
"thp_split_page",
"thp_split_page_failed",
+ "thp_deferred_split_page",
"thp_split_pmd",
"thp_zero_page_alloc",
"thp_zero_page_alloc_failed",
--
2.7.0
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