minor changes

mooncake-transfer-engine/src/topology.cpp

@@ -9,7 +9,7 @@
 #include <vector>
 
 #ifdef USE_CUDA
-#include "cuda_runtime.h"
+#include <cuda_runtime.h>
 #endif
 
 #include <ctype.h>
@@ -172,6 +172,8 @@ static std::vector<TopologyEntry> discover_cuda_topology(
         std::vector<std::string> preferred_hca;
         std::vector<std::string> avail_hca;
         for (const auto &hca : all_hca) {
+            // FIXME: currently we only identify the NICs connected to the same
+            // PCIe switch/RC with GPU as preferred.
             if (get_pci_distance(hca.pci_bus_id.c_str(), pci_bus_id) == 0) {
                 preferred_hca.push_back(hca.name);
             } else {