fieldstat增加health check功能的计数

platform/include/sce.h

@@ -56,6 +56,8 @@ struct session_ctx
     // depending on first control packet
     struct packet_info first_ctrl_pkt;
     struct selected_chaining *chaining;
+
+    struct thread_ctx *ref_thread_ctx;
 };
 
 struct session_ctx *session_ctx_new();