diff --git a/src/hotspot/share/cds/filemap.cpp b/src/hotspot/share/cds/filemap.cpp
index 72a7bb021c3..afc45424f7a 100644
--- a/src/hotspot/share/cds/filemap.cpp
+++ b/src/hotspot/share/cds/filemap.cpp
@@ -2060,6 +2060,20 @@ size_t FileMapInfo::read_bytes(void* buffer, size_t count) {
   return count;
 }
 
+// Get the total size in bytes of a read only region
+size_t FileMapInfo::readonly_total() {
+  size_t total = 0;
+  if (current_info() != nullptr) {
+    FileMapRegion* r = FileMapInfo::current_info()->region_at(MetaspaceShared::ro);
+    if (r->read_only()) total += r->used();
+  }
+  if (dynamic_info() != nullptr) {
+    FileMapRegion* r = FileMapInfo::dynamic_info()->region_at(MetaspaceShared::ro);
+    if (r->read_only()) total += r->used();
+  }
+  return total;
+}
+
 static MemRegion *closed_heap_regions = NULL;
 static MemRegion *open_heap_regions = NULL;
 static int num_closed_heap_regions = 0;
diff --git a/src/hotspot/share/cds/filemap.hpp b/src/hotspot/share/cds/filemap.hpp
index a67274d532a..c71184b82a6 100644
--- a/src/hotspot/share/cds/filemap.hpp
+++ b/src/hotspot/share/cds/filemap.hpp
@@ -460,6 +460,7 @@ public:
   void  write_bytes(const void* buffer, size_t count);
   void  write_bytes_aligned(const void* buffer, size_t count);
   size_t  read_bytes(void* buffer, size_t count);
+  static size_t readonly_total();
   MapArchiveResult map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs);
   void  unmap_regions(int regions[], int num_regions);
   void  map_or_load_heap_regions() NOT_CDS_JAVA_HEAP_RETURN;
diff --git a/src/hotspot/share/services/memReporter.cpp b/src/hotspot/share/services/memReporter.cpp
index 92dbb801e02..ec1f032fa88 100644
--- a/src/hotspot/share/services/memReporter.cpp
+++ b/src/hotspot/share/services/memReporter.cpp
@@ -22,6 +22,7 @@
  *
  */
 #include "precompiled.hpp"
+#include "cds/filemap.hpp"
 #include "memory/allocation.hpp"
 #include "memory/metaspace.hpp"
 #include "memory/metaspaceUtils.hpp"
@@ -205,6 +206,13 @@ void MemSummaryReporter::report_summary_of_type(MEMFLAGS flag,
     const char*   scale = current_scale();
     out->print("-%26s (", NMTUtil::flag_to_name(flag));
     print_total(reserved_amount, committed_amount);
+#if INCLUDE_CDS
+    if (flag == mtClassShared) {
+        size_t read_only_bytes = FileMapInfo::readonly_total();
+      output()->print(", readonly=" SIZE_FORMAT "%s",
+                      amount_in_current_scale(read_only_bytes), scale);
+    }
+#endif
     out->print_cr(")");
 
     if (flag == mtClass) {
diff --git a/test/hotspot/jtreg/runtime/NMT/SummarySanityCheck.java b/test/hotspot/jtreg/runtime/NMT/SummarySanityCheck.java
index 099836a12e9..e9576c24faf 100644
--- a/test/hotspot/jtreg/runtime/NMT/SummarySanityCheck.java
+++ b/test/hotspot/jtreg/runtime/NMT/SummarySanityCheck.java
@@ -64,8 +64,8 @@ public class SummarySanityCheck {
     long totalCommitted = 0, totalReserved = 0;
     long totalCommittedSum = 0, totalReservedSum = 0;
 
-    // Match '- <mtType> (reserved=<reserved>KB, committed=<committed>KB)
-    Pattern mtTypePattern = Pattern.compile("-\\s+(?<typename>[\\w\\s]+)\\(reserved=(?<reserved>\\d+)KB,\\scommitted=(?<committed>\\d+)KB\\)");
+    // Match '- <mtType> (reserved=<reserved>KB, committed=<committed>KB) and some times readonly=<readonly>KB
+    Pattern mtTypePattern = Pattern.compile("-\\s+(?<typename>[\\w\\s]+)\\(reserved=(?<reserved>\\d+)KB,\\scommitted=(?<committed>\\d+)KB((,\\sreadonly=(?<readonly>\\d+)KB)|)\\)");
     // Match 'Total: reserved=<reserved>KB, committed=<committed>KB'
     Pattern totalMemoryPattern = Pattern.compile("Total\\:\\sreserved=(?<reserved>\\d+)KB,\\scommitted=(?<committed>\\d+)KB");
 
@@ -85,6 +85,16 @@ public class SummarySanityCheck {
           long typeCommitted = Long.parseLong(typeMatcher.group("committed"));
           long typeReserved = Long.parseLong(typeMatcher.group("reserved"));
 
+          // Only Shared class space has readonly component
+          if (lines[i].contains("Shared class space") && typeMatcher.group("readonly") != null) {
+            long typeReadOnly = Long.parseLong(typeMatcher.group("readonly"));
+            // Make sure readonly is always less or equal to committed
+            if (typeReadOnly > typeCommitted) {
+              throwTestException("Readonly (" + typeReadOnly + ") was more than Committed ("
+                  + typeCommitted + ") for mtType: " + typeMatcher.group("typename"));
+            }
+          }
+
           // Make sure reserved is always less or equals
           if (typeCommitted > typeReserved) {
             throwTestException("Committed (" + typeCommitted + ") was more than Reserved ("