--- /dev/null	2020-02-11 09:31:42.601809740 +0100
+++ new/test/lib/jdk/test/lib/containers/cgroup/CgroupMetricsTester.java	2020-02-11 18:29:00.963687886 +0100
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2019, Red Hat Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.test.lib.containers.cgroup;
+
+import java.io.IOException;
+import java.math.BigInteger;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
+interface CgroupMetricsTester {
+
+    public static final double ERROR_MARGIN = 0.1;
+    public static final String EMPTY_STR = "";
+
+    public void testMemorySubsystem();
+    public void testCpuAccounting();
+    public void testCpuSchedulingMetrics();
+    public void testCpuSets();
+    public void testCpuConsumption() throws IOException, InterruptedException;
+    public void testMemoryUsage() throws Exception;
+    public void testMisc();
+
+    public static long convertStringToLong(String strval, long overflowRetval) {
+        long retval = 0;
+        if (strval == null) return 0L;
+
+        try {
+            retval = Long.parseLong(strval);
+        } catch (NumberFormatException e) {
+            // For some properties (e.g. memory.limit_in_bytes) we may overflow the range of signed long.
+            // In this case, return Long.MAX_VALUE
+            BigInteger b = new BigInteger(strval);
+            if (b.compareTo(BigInteger.valueOf(Long.MAX_VALUE)) > 0) {
+                return overflowRetval;
+            }
+        }
+        return retval;
+    }
+
+    public static boolean compareWithErrorMargin(long oldVal, long newVal) {
+        return Math.abs(oldVal - newVal) <= Math.abs(oldVal * ERROR_MARGIN);
+    }
+
+    public static boolean compareWithErrorMargin(double oldVal, double newVal) {
+        return Math.abs(oldVal - newVal) <= Math.abs(oldVal * ERROR_MARGIN);
+    }
+
+    public static void fail(String controller, String metric, long oldVal, long testVal) {
+        throw new RuntimeException("Test failed for - " + controller + ":"
+                + metric + ", expected [" + oldVal + "], got [" + testVal + "]");
+    }
+
+    public static void fail(String controller, String metric, String oldVal, String testVal) {
+        throw new RuntimeException("Test failed for - " + controller + ":"
+                + metric + ", expected [" + oldVal + "], got [" + testVal + "]");
+    }
+
+    public static void fail(String controller, String metric, double oldVal, double testVal) {
+        throw new RuntimeException("Test failed for - " + controller + ":"
+                + metric + ", expected [" + oldVal + "], got [" + testVal + "]");
+    }
+
+    public static void fail(String controller, String metric, boolean oldVal, boolean testVal) {
+        throw new RuntimeException("Test failed for - " + controller + ":"
+                + metric + ", expected [" + oldVal + "], got [" + testVal + "]");
+    }
+
+    public static void warn(String controller, String metric, long oldVal, long testVal) {
+        System.err.println("Warning - " + controller + ":" + metric
+                + ", expected [" + oldVal + "], got [" + testVal + "]");
+    }
+
+    public static Integer[] convertCpuSetsToArray(String cpusstr) {
+        if (cpusstr == null || EMPTY_STR.equals(cpusstr)) {
+            return new Integer[0];
+        }
+        // Parse range string in the format 1,2-6,7
+        Integer[] cpuSets = Stream.of(cpusstr.split(",")).flatMap(a -> {
+            if (a.contains("-")) {
+                String[] range = a.split("-");
+                return IntStream.rangeClosed(Integer.parseInt(range[0]),
+                        Integer.parseInt(range[1])).boxed();
+            } else {
+                return Stream.of(Integer.parseInt(a));
+            }
+        }).toArray(Integer[]::new);
+        return cpuSets;
+    }
+
+}