[RFC v2 PATCH 5/8] mm: introduce a new zone_stat_item NR_FREE_MIRROR_PAGES

[Xishi Qiu <qiuxishi@huawei.com>]

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@huawei.com>
---
 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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