This patch introduces a new zone_stat_item called "NR_FREE_MIRROR_PAGES", it is
used to storage free mirrored pages count.
Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
---
include/linux/mmzone.h | 1 +
include/linux/vmstat.h | 2 ++
mm/vmstat.c | 1 +
3 files changed, 4 insertions(+)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 54e891a..7cc0a29 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -166,6 +166,7 @@ enum zone_stat_item {
WORKINGSET_NODERECLAIM,
NR_ANON_TRANSPARENT_HUGEPAGES,
NR_FREE_CMA_PAGES,
+ NR_FREE_MIRROR_PAGES,
NR_VM_ZONE_STAT_ITEMS };
/*
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 82e7db7..d0a7268 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -283,6 +283,8 @@ static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
__mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
if (is_migrate_cma(migratetype))
__mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
+ if (is_migrate_mirror(migratetype))
+ __mod_zone_page_state(zone, NR_FREE_MIRROR_PAGES, nr_pages);
}
extern const char * const vmstat_text[];
diff --git a/mm/vmstat.c b/mm/vmstat.c
index d0323e0..7ee11ca 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -739,6 +739,7 @@ const char * const vmstat_text[] = {
"workingset_nodereclaim",
"nr_anon_transparent_hugepages",
"nr_free_cma",
+ "nr_free_mirror",
/* enum writeback_stat_item counters */
"nr_dirty_threshold",
--
2.0.0
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