1 files changed, 15 insertions, 0 deletions
diff --git a/lib/gitlab/metrics/memory.rb b/lib/gitlab/metrics/memory.rb
new file mode 100644
index 00000000000..c165cdec7a3
--- /dev/null
+++ b/lib/gitlab/metrics/memory.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Metrics
+    module Memory
+      extend self
+
+      HEAP_SLOTS_PER_PAGE = GC::INTERNAL_CONSTANTS[:HEAP_PAGE_OBJ_LIMIT]
+
+      def gc_heap_fragmentation(gc_stat = GC.stat)
+        1 - (gc_stat[:heap_live_slots] / (HEAP_SLOTS_PER_PAGE * gc_stat[:heap_eden_pages].to_f))
+      end
+    end
+  end
+end