This patch add pgvolatile vmstat so admin can see how many of volatile
pages are discarded by VM until now.
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
---
include/linux/vm_event_item.h | 3 +++
mm/mvolatile.c | 1 +
mm/vmstat.c | 3 +++
3 files changed, 7 insertions(+)
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 3d31145..721d096 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -25,6 +25,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
FOR_ALL_ZONES(PGALLOC),
PGFREE, PGACTIVATE, PGDEACTIVATE,
PGFAULT, PGMAJFAULT,
+#ifdef CONFIG_VOLATILE_PAGE
+ PGVOLATILE,
+#endif
FOR_ALL_ZONES(PGREFILL),
FOR_ALL_ZONES(PGSTEAL_KSWAPD),
FOR_ALL_ZONES(PGSTEAL_DIRECT),
diff --git a/mm/mvolatile.c b/mm/mvolatile.c
index 6bc9f7e..c66c3bc 100644
--- a/mm/mvolatile.c
+++ b/mm/mvolatile.c
@@ -201,6 +201,7 @@ int discard_volatile_page(struct page *page, enum ttu_flags ttu_flags)
if (try_to_volatile_page(page, ttu_flags)) {
if (page_freeze_refs(page, 1)) {
unlock_page(page);
+ count_vm_event(PGVOLATILE);
return 1;
}
}
diff --git a/mm/vmstat.c b/mm/vmstat.c
index c737057..3d08e1a 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -753,6 +753,9 @@ const char * const vmstat_text[] = {
"pgfault",
"pgmajfault",
+#ifdef CONFIG_VOLATILE_PAGE
+ "pgvolatile",
+#endif
TEXTS_FOR_ZONES("pgrefill")
TEXTS_FOR_ZONES("pgsteal_kswapd")
TEXTS_FOR_ZONES("pgsteal_direct")
--
1.7.9.5
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