diff --git a/headers/private/kernel/block_cache.h b/headers/private/kernel/block_cache.h
index 321a549087..a15a0d8447 100644
--- a/headers/private/kernel/block_cache.h
+++ b/headers/private/kernel/block_cache.h
@@ -14,9 +14,10 @@ extern "C" {
 #endif
 
 extern status_t block_cache_init(void);
+extern size_t block_cache_used_memory();
 
 #ifdef __cplusplus
 }
 #endif
 
-#endif	/* _KRENEL_BLOCK_CACHE_H */
+#endif	/* _KERNEL_BLOCK_CACHE_H */
diff --git a/src/system/kernel/cache/block_cache.cpp b/src/system/kernel/cache/block_cache.cpp
index d882a55492..bc089ff6d3 100644
--- a/src/system/kernel/cache/block_cache.cpp
+++ b/src/system/kernel/cache/block_cache.cpp
@@ -1807,6 +1807,27 @@ block_cache_init(void)
 }
 
 
+extern "C" size_t
+block_cache_used_memory()
+{
+	size_t usedMemory = 0;
+
+	MutexLocker _(sCachesLock);
+
+	DoublyLinkedList<block_cache>::Iterator it = sCaches.GetIterator();
+	while (block_cache* cache = it.Next()) {
+		if (cache == (block_cache*)&sMarkCache)
+			continue;
+
+		size_t cacheUsedMemory;
+		object_cache_get_usage(cache->buffer_cache, &cacheUsedMemory);
+		usedMemory += cacheUsedMemory;
+	}
+
+	return usedMemory;
+}
+
+
 //	#pragma mark - public transaction API