8180280: [TESTBUG] Test for JDK-8180048

Add test at is executed only at higher tiers to allow more time for execution. Reviewed-by: kbarrett, eosterlund
2026-01-28 12:09:14 +00:00 · 2018-01-11 11:05:17 +01:00 · 2018-01-11 11:05:17 +01:00 · 3be36b20e4
commit 3be36b20e4
parent 6e9f44c74c
1 changed files with 103 additions and 0 deletions
--- a/test/hotspot/jtreg/gc/stress/TestReclaimStringsLeaksMemory.java
+++ b/test/hotspot/jtreg/gc/stress/TestReclaimStringsLeaksMemory.java
@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2018, 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 TestReclaimStringsLeaksMemory
+ * @bug 8180048
+ * @summary Ensure that during a Full GC interned string memory is reclaimed completely.
+ * @requires vm.gc=="null"
+ * @requires !vm.debug
+ * @key gc
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ * @run main/othervm TestReclaimStringsLeaksMemory
+ * @run main/othervm TestReclaimStringsLeaksMemory -XX:+UseSerialGC
+ * @run main/othervm TestReclaimStringsLeaksMemory -XX:+UseParallelGC
+ * @run main/othervm TestReclaimStringsLeaksMemory -XX:+UseParallelGC -XX:-UseParallelOldGC
+ * @run main/othervm TestReclaimStringsLeaksMemory -XX:+UseConcMarkSweepGC
+ * @run main/othervm TestReclaimStringsLeaksMemory -XX:+UseG1GC
+ */
+
+import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
+
+import jdk.test.lib.Asserts;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+
+public class TestReclaimStringsLeaksMemory {
+
+    // The amount of memory in kB reserved in the "Symbol" category that indicates a memory leak for
+    // this test.
+    public static final int ReservedThreshold = 70000;
+
+    public static void main(String[] args) throws Exception {
+        ArrayList<String> baseargs = new ArrayList(Arrays.asList( "-Xms256M",
+                                                                  "-Xmx256M",
+                                                                  "-Xlog:gc*",
+                                                                  "-XX:NativeMemoryTracking=summary",
+                                                                  "-XX:+UnlockDiagnosticVMOptions",
+                                                                  "-XX:+PrintNMTStatistics" ));
+        baseargs.addAll(Arrays.asList(args));
+        baseargs.add(GCTest.class.getName());
+        ProcessBuilder pb_default =
+            ProcessTools.createJavaProcessBuilder(baseargs.toArray(new String[] {}));
+        verifySymbolMemoryUsageNotTooHigh(new OutputAnalyzer(pb_default.start()));
+    }
+
+    private static void verifySymbolMemoryUsageNotTooHigh(OutputAnalyzer output) throws Exception {
+        String stdout = output.getStdout();
+        System.out.println(stdout);
+
+        Pattern p = Pattern.compile("Symbol \\(reserved=(\\d*)");
+        Matcher m = p.matcher(stdout);
+
+        if (!m.find()) {
+            throw new RuntimeException("Could not find Symbol memory usage in NMT output");
+        }
+
+        int reserved = Integer.parseInt(m.group(1));
+        Asserts.assertLT(reserved, ReservedThreshold, "Reserved memory size is " + reserved + "KB which is greater than or equal to " + ReservedThreshold + "KB indicating a memory leak");
+
+        output.shouldHaveExitValue(0);
+    }
+
+    static class GCTest {
+        public static final String BaseName = "SomeRandomBaseString";
+        public static volatile String lastString;
+
+        public static void main(String [] args) {
+            for (int iterations = 0; iterations < 20;) {
+                for (int i = 0; i < 1000000; i++) {
+                    lastString = (BaseName + i).intern();
+                }
+                if (++iterations % 5 == 0) {
+                   System.gc();
+                }
+            }
+        }
+    }
+}
+