diff --git a/core/src/main/java/org/apache/spark/memory/TaskMemoryManager.java b/core/src/main/java/org/apache/spark/memory/TaskMemoryManager.java
index ab9e470e0c2c..8b41df6b269f 100644
--- a/core/src/main/java/org/apache/spark/memory/TaskMemoryManager.java
+++ b/core/src/main/java/org/apache/spark/memory/TaskMemoryManager.java
@@ -339,9 +339,12 @@ public void showMemoryUsage() {
         MDC.of(LogKeys.MEMORY_SIZE, memoryNotAccountedFor),
         MDC.of(LogKeys.TASK_ATTEMPT_ID, taskAttemptId));
       logger.info(
-        "{} bytes of memory are used for execution and {} bytes of memory are used for storage",
+        "{} bytes of memory are used for execution " +
+                "and {} bytes of memory are used for storage " +
+                "and {} bytes of unmanaged memory are used",
         MDC.of(LogKeys.EXECUTION_MEMORY_SIZE, memoryManager.executionMemoryUsed()),
-        MDC.of(LogKeys.STORAGE_MEMORY_SIZE,  memoryManager.storageMemoryUsed()));
+        MDC.of(LogKeys.STORAGE_MEMORY_SIZE,  memoryManager.storageMemoryUsed()),
+        MDC.of(LogKeys.MEMORY_SIZE, UnifiedMemoryManager$.MODULE$.getUnmanagedMemoryUsed()));
     }
   }
 
diff --git a/core/src/main/scala/org/apache/spark/memory/UnifiedMemoryManager.scala b/core/src/main/scala/org/apache/spark/memory/UnifiedMemoryManager.scala
index db51f14415e1..6b278c47f32f 100644
--- a/core/src/main/scala/org/apache/spark/memory/UnifiedMemoryManager.scala
+++ b/core/src/main/scala/org/apache/spark/memory/UnifiedMemoryManager.scala
@@ -273,6 +273,14 @@ object UnifiedMemoryManager extends Logging {
   // Atomic flag to ensure polling is only started once per JVM
   private val pollingStarted = new AtomicBoolean(false)
 
+  /**
+   * Returns the total unmanaged memory in bytes, including both
+   * on-heap unmanaged memory and off-heap unmanaged memory.
+   */
+  private[spark] def getUnmanagedMemoryUsed: Long = {
+    UnifiedMemoryManager.unmanagedOnHeapUsed.get() + UnifiedMemoryManager.unmanagedOffHeapUsed.get()
+  }
+
   /**
    * Register an unmanaged memory consumer to track its memory usage.
    *