[PATCHv2 5/6] zsmalloc: extend compaction statistics

[Sergey Senozhatsky]

Extend zsmalloc zs_pool_stats with a new member that
holds the number of objects pool compaction moved
between pool pages.

Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
---
 include/linux/zsmalloc.h | 2 ++
 mm/zsmalloc.c            | 1 +
 2 files changed, 3 insertions(+)

diff --git a/include/linux/zsmalloc.h b/include/linux/zsmalloc.h
index a48cd0ffe57d..8b3fa5b4a68c 100644
--- a/include/linux/zsmalloc.h
+++ b/include/linux/zsmalloc.h
@@ -36,6 +36,8 @@ enum zs_mapmode {
 struct zs_pool_stats {
 	/* How many pages were migrated (freed) */
 	atomic_long_t pages_compacted;
+	/* How many objects were migrated during compaction */
+	atomic_long_t objs_moved;
 };
 
 struct zs_pool;
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index eacf9e32da5c..f7e69df48fb0 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1815,6 +1815,7 @@ static void migrate_zspage(struct zs_pool *pool, struct size_class *class,
 		obj_idx++;
 		record_obj(handle, free_obj);
 		obj_free(class->size, used_obj, NULL);
+		atomic_long_inc(&pool->stats.objs_moved);
 	}
 
 	/* Remember last position in this iteration */
-- 
2.39.2.637.g21b0678d19-goog