From 24874a52d83f36a1902d0f5d0071efacb18e7466 Mon Sep 17 00:00:00 2001
From: Alexey Rybalchenko <alexryba@gmail.com>
Date: Wed, 24 Jan 2024 11:26:47 +0100
Subject: [PATCH] shm: extend monitor output for refCount region

---
 fairmq/shmem/Monitor.cxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fairmq/shmem/Monitor.cxx b/fairmq/shmem/Monitor.cxx
index d056834c..b996caac 100644
--- a/fairmq/shmem/Monitor.cxx
+++ b/fairmq/shmem/Monitor.cxx
@@ -274,7 +274,9 @@ bool Monitor::PrintShm(const ShmId& shmId)
 
                 try {
                     managed_shared_memory rcCountSegment(open_read_only, MakeShmName(shmId.shmId, "rrc", id).c_str());
-                    ss << ", rcCountSegment size: " << rcCountSegment.get_size() << ", free: " << rcCountSegment.get_free_memory();
+                    auto size = rcCountSegment.get_size();
+                    auto free = rcCountSegment.get_free_memory();
+                    ss << ", rcCountSegment size: " << size << ", free: " << free << ", used: " << size - free;
                 } catch (bie&) {
                     ss << ", rcCountSegment: not found";
                 }