[PATCHv2 12/28] thp, vmstats: add counters for huge file pages

From: Kirill A. Shutemov
Date: Thu Feb 11 2016 - 09:23:34 EST


THP_FILE_ALLOC: how many times huge page was allocated and put page
cache.

THP_FILE_MAPPED: how many times file huge page was mapped.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
include/linux/vm_event_item.h | 7 +++++++
mm/memory.c | 1 +
mm/vmstat.c | 2 ++
3 files changed, 10 insertions(+)

diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index b79e831006b0..8359022f6ea1 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -69,6 +69,8 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
THP_FAULT_FALLBACK,
THP_COLLAPSE_ALLOC,
THP_COLLAPSE_ALLOC_FAILED,
+ THP_FILE_ALLOC,
+ THP_FILE_MAPPED,
THP_SPLIT_PAGE,
THP_SPLIT_PAGE_FAILED,
THP_DEFERRED_SPLIT_PAGE,
@@ -99,4 +101,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
NR_VM_EVENT_ITEMS
};

+#ifndef CONFIG_TRANSPARENT_HUGEPAGE
+#define THP_FILE_ALLOC ({ BUILD_BUG(); 0; })
+#define THP_FILE_MAPPED ({ BUILD_BUG(); 0; })
+#endif
+
#endif /* VM_EVENT_ITEM_H_INCLUDED */
diff --git a/mm/memory.c b/mm/memory.c
index fb61e82bbb9a..6c98ed8e3c4a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2874,6 +2874,7 @@ static int do_set_pmd(struct fault_env *fe, struct page *page)

/* fault is handled */
ret = 0;
+ count_vm_event(THP_FILE_MAPPED);
out:
spin_unlock(fe->ptl);
return ret;
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 801e6b18fb94..e69031a3b306 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -846,6 +846,8 @@ const char * const vmstat_text[] = {
"thp_fault_fallback",
"thp_collapse_alloc",
"thp_collapse_alloc_failed",
+ "thp_file_alloc",
+ "thp_file_mapped",
"thp_split_page",
"thp_split_page_failed",
"thp_deferred_split_page",
--
2.7.0