From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
HZP_ALLOC event triggers on every huge zero page allocation, including
allocations which where dropped due race with other allocation.
HZP_ALLOC_FAILED event triggers on huge zero page allocation fail
(ENOMEM).
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
include/linux/vm_event_item.h | 2 ++
mm/huge_memory.c | 5 ++++-
mm/vmstat.c | 2 ++
3 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 3d31145..d7156fb 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -58,6 +58,8 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
THP_COLLAPSE_ALLOC,
THP_COLLAPSE_ALLOC_FAILED,
THP_SPLIT,
+ HZP_ALLOC,
+ HZP_ALLOC_FAILED,
#endif
NR_VM_EVENT_ITEMS
};
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 92a1b66..492658a 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -183,8 +183,11 @@ retry:
zero_page = alloc_pages((GFP_TRANSHUGE | __GFP_ZERO) & ~__GFP_MOVABLE,
HPAGE_PMD_ORDER);
- if (!zero_page)
+ if (!zero_page) {
+ count_vm_event(HZP_ALLOC_FAILED);
return 0;
+ }
+ count_vm_event(HZP_ALLOC);
preempt_disable();
if (cmpxchg(&huge_zero_pfn, 0, page_to_pfn(zero_page))) {
preempt_enable();
diff --git a/mm/vmstat.c b/mm/vmstat.c
index c737057..cb8901c 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -801,6 +801,8 @@ const char * const vmstat_text[] = {
"thp_collapse_alloc",
"thp_collapse_alloc_failed",
"thp_split",
+ "hzp_alloc",
+ "hzp_alloc_failed",
#endif
#endif /* CONFIG_VM_EVENTS_COUNTERS */
--
1.7.7.6
--
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