[Qemu-devel] [RFC V1 12/14] qcow2: Add qcow2_dedup_update_metrics to compute dedup RAM usage.

["Benoît Canet" <benoit@irqsave.net>]

---
 block/qcow2-dedup.c |   13 +++++++++++++
 block/qcow2.h       |    1 +
 2 files changed, 14 insertions(+)

diff --git a/block/qcow2-dedup.c b/block/qcow2-dedup.c
index db23b71..4305746 100644
--- a/block/qcow2-dedup.c
+++ b/block/qcow2-dedup.c
@@ -1311,3 +1311,16 @@ void qcow2_dedup_close(BlockDriverState *bs)
 {
     qcow2_dedup_free(bs);
 }
+
+#define GTREE_NODE_SIZE sizeof(int) * 5
+
+void qcow2_dedup_update_metrics(BlockDriverState *bs)
+{
+    BDRVQcowState *s = bs->opaque;
+
+    uint64_t nb_hashs = s->dedup_metrics.ram_hash_creations -
+                        s->dedup_metrics.ram_hash_deletions;
+
+    s->dedup_metrics.ram_usage = nb_hashs * GTREE_NODE_SIZE * 2;
+    s->dedup_metrics.ram_usage += nb_hashs * sizeof(QCowHashNode);
+}
diff --git a/block/qcow2.h b/block/qcow2.h
index 0729ff2..d8e8539 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -510,5 +510,6 @@ void qcow2_dedup_refcount_half_max_reached(BlockDriverState *bs,
 bool qcow2_dedup_is_running(BlockDriverState *bs);
 int qcow2_dedup_init(BlockDriverState *bs);
 void qcow2_dedup_close(BlockDriverState *bs);
+void qcow2_dedup_update_metrics(BlockDriverState *bs);
 
 #endif
-- 
1.7.10.4