[ovs-dev] [PATCH ovn v3 2/2] lflow.c: Release ref_lflow_node as soon as it is not needed.

[Han Zhou]

If a resource doesn't have any lflows referencing it any more, the
node ref_lflow_node in lflow_resource_ref.ref_lflow_table should
be removed and released. Otherwise, the table could keep growing
in some scenarios, until a recompute is triggered. Now that the
chance of triggering recompute is lower and there are more resources
references maintained (for type port-binding), this problem is
more likely to happen than before. This patch fixes the problem
by releasing the node as soon as it is not needed.

Fixes: d2aa2c7cafe ("ovn-controller: Maintain resource references for logical flows.")
Signed-off-by: Han Zhou <hzhou at ovn.org>
---
 controller/lflow.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/controller/lflow.c b/controller/lflow.c
index db078d2..b549067 100644
--- a/controller/lflow.c
+++ b/controller/lflow.c
@@ -292,6 +292,10 @@ lflow_resource_destroy_lflow(struct lflow_resource_ref *lfrr,
     LIST_FOR_EACH_SAFE (lrln, next, list_node, &lfrn->lflow_ref_head) {
         ovs_list_remove(&lrln->list_node);
         hmap_remove(&lrln->rlfn->lflow_uuids, &lrln->hmap_node);
+        if (hmap_is_empty(&lrln->rlfn->lflow_uuids)) {
+            hmap_remove(&lfrr->ref_lflow_table, &lrln->rlfn->node);
+            ref_lflow_node_destroy(lrln->rlfn);
+        }
         free(lrln);
     }
     free(lfrn);
-- 
2.1.0