adding slabwatch

stp/slabwatch.stp

@@ -0,0 +1,31 @@
+#!/usr/bin/env stap
+#
+# SPDX-License-Identifier: MIT
+
+global slabs
+global freed
+
+probe vm.kmem_cache_alloc {
+  slabs [execname(), bytes_alloc, ptr, gfp_flag_name]<<<1
+}
+
+probe vm.kmem_cache_free {
+  freed [execname(), ptr, name]<<<1
+}
+
+probe begin {
+  print("\"TYPE\",\"PROCESS\",\"POINTER\",\"BYTES\",\"FLAGS/NAME\"\n");
+}
+
+probe timer.ms(10000) {
+  foreach ([name, bytes, ptr, flags] in slabs) {
+    printf("\"ALLOC\",\"%s\",\"%p\",\"%d\",\"%s\"\n",
+           name, ptr, bytes, flags);
+  }
+  foreach ([execname, ptr, name] in freed) {
+    printf("\"FREE\",\"%s\",\"%p\",\"\",\"%s\"\n",
+           execname, ptr, name);
+  }
+  delete slabs
+  delete freed
+}