Add a test.

test/hotspot/jtreg/containers/docker/TestContainerInfo.java

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+/*
+ * Copyright (c) 2017, 2022, Oracle and/or its affiliates. All rights reserved.
+ * 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.
+ *
+ * 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.
+ */
+
+
+/*
+ * @test
+ * @summary Test container info for cgroup v2
+ * @requires docker.support
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ *          java.management
+ *          jdk.jartool/sun.tools.jar
+ * @build CheckContainerized jdk.test.whitebox.WhiteBox PrintContainerInfo
+ * @run driver jdk.test.lib.helpers.ClassFileInstaller -jar whitebox.jar jdk.test.whitebox.WhiteBox
+ * @run driver TestContainerInfo
+ */
+import jtreg.SkippedException;
+import jdk.test.lib.containers.docker.Common;
+import jdk.test.lib.containers.docker.DockerTestUtils;
+import jdk.test.lib.containers.docker.DockerRunOptions;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+
+
+public class TestContainerInfo {
+    private static final String imageName = Common.imageName("container-info");
+
+    public static void main(String[] args) throws Exception {
+        if (!DockerTestUtils.canTestDocker()) {
+            return;
+        }
+
+        Common.prepareWhiteBox();
+        DockerTestUtils.buildJdkContainerImage(imageName);
+
+        try {
+            testPrintContainerInfoWithoutSwap();
+        } finally {
+            DockerTestUtils.removeDockerImage(imageName);
+        }
+    }
+
+    private static void testPrintContainerInfoWithoutSwap() throws Exception {
+        Common.logNewTestCase("Test print_container_info() - without swap");
+
+        DockerRunOptions opts = Common.newOpts(imageName, "PrintContainerInfo")
+		                  .addDockerOpts("--memory=500m")
+		                  .addDockerOpts("--memory-swap=500m"); // no swap
+        Common.addWhiteBoxOpts(opts);
+
+        OutputAnalyzer out = Common.run(opts);
+        checkContainerInfo(out);
+    }
+
+    private static void checkContainerInfo(OutputAnalyzer out) throws Exception {
+        String str = out.getOutput();
+        if (str.contains("cgroupv2")) {
+            out.shouldContain("memory_swap_max_limit_in_bytes: 0");
+            out.shouldContain("memory_swap_current_in_bytes: 0");
+        } else {
+            throw new SkippedException("This test is cgroups v2 specific, skipped on cgroups v1");
+        }
+    }
+
+}