diff --git a/.gitmodules b/.gitmodules
index 28dfb90..efa14ef 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -30,6 +30,12 @@
 [submodule "submodules/linux"]
 	path = submodules/linux
 	url = https://github.com/cirosantilli/linux
+[submodule "submodules/lmbench"]
+	path = submodules/lmbench
+	url = https://github.com/cirosantilli/lmbench
+[submodule "submodules/omp-validation"]
+	path = submodules/omp-validation
+	url = https://github.com/cirosantilli/omp-validation
 [submodule "submodules/parsec-benchmark"]
 	path = submodules/parsec-benchmark
 	url = https://github.com/cirosantilli/parsec-benchmark
@@ -42,6 +48,3 @@
 [submodule "submodules/stream-benchmark"]
 	path = submodules/stream-benchmark
 	url = https://github.com/cirosantilli/stream-benchmark
-[submodule "submodules/omp-validation"]
-	path = submodules/omp-validation
-	url = https://github.com/cirosantilli/omp-validation
diff --git a/README.adoc b/README.adoc
index a9717ed..4161ca7 100644
--- a/README.adoc
+++ b/README.adoc
@@ -18147,7 +18147,7 @@ Aborted (core dumped)
 
 Get the failing command with:
 
-,,..
+....
 make VERBOSE=1 model-armv8
 ....
 
@@ -19718,6 +19718,8 @@ Examples:
 * `fs`
 ** link:rootfs_overlay/lkmc/nodejs/file_write_read.js[]
 ** link:rootfs_overlay/lkmc/nodejs/read_stdin_to_string.js[] Question: https://stackoverflow.com/questions/30441025/read-all-text-from-stdin-to-a-string
+* `class`
+** link:rootfs_overlay/lkmc/nodejs/object_to_string.js[]: `util.inspect.custom` and `toString` override experiment: https://stackoverflow.com/questions/24902061/is-there-an-repr-equivalent-for-javascript/26698403#26698403
 
 ===== NPM
 
diff --git a/nodejs b/nodejs
new file mode 120000
index 0000000..b0494e0
--- /dev/null
+++ b/nodejs
@@ -0,0 +1 @@
+rootfs_overlay/lkmc/nodejs/
\ No newline at end of file
diff --git a/python b/python
new file mode 120000
index 0000000..cb06030
--- /dev/null
+++ b/python
@@ -0,0 +1 @@
+rootfs_overlay/lkmc/python/
\ No newline at end of file
diff --git a/rootfs_overlay/lkmc/nodejs/object_to_string.js b/rootfs_overlay/lkmc/nodejs/object_to_string.js
new file mode 100755
index 0000000..73100e0
--- /dev/null
+++ b/rootfs_overlay/lkmc/nodejs/object_to_string.js
@@ -0,0 +1,36 @@
+#!/usr/bin/env node
+
+// https://cirosantilli.com/linux-kernel-module-cheat#node-js
+
+
+const util = require('util');
+
+class MyClassUtilInspectCustom {
+  constructor(a, b) {
+    this.a = a;
+    this.b = b;
+  }
+  [util.inspect.custom]() {
+    return `my type is MyClassUtilInspectCustom and a is ${this.a} and b is ${this.b}`;
+  }
+}
+
+let my_object = new MyClassUtilInspectCustom(1, 2);
+console.log(util.inspect(my_object));
+console.log(my_object);
+console.log(my_object.toString());
+
+class MyClassToString {
+  constructor(a, b) {
+    this.a = a;
+    this.b = b;
+  }
+  toString() {
+    return `my type is MyClassToString and a is ${this.a} and b is ${this.b}`;
+  }
+}
+
+my_object = new MyClassToString(1, 2);
+console.log(util.inspect(my_object));
+console.log(my_object);
+console.log(my_object.toString());
diff --git a/submodules/lmbench b/submodules/lmbench
new file mode 160000
index 0000000..5ddee65
--- /dev/null
+++ b/submodules/lmbench
@@ -0,0 +1 @@
+Subproject commit 5ddee6553420077873891c2706a02e095466ca4c