8268699: Shenandoah: Add test for JDK-8268127

Backport-of: e59acd9

test/hotspot/jtreg/gc/shenandoah/options/TestLargePagesWithSmallHeap.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2021, Red Hat, Inc. 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 id=default
+ * @requires vm.gc.Shenandoah
+ * @bug 8268127
+ * @summary when heap is too small for regions to align to large page size, should fallback to regular page size
+ *
+ * @run main/othervm -XX:+UseShenandoahGC -Xms17m -Xmx17m TestLargePagesWithSmallHeap
+ * @run main/othervm -XX:+UseShenandoahGC         -Xmx17m TestLargePagesWithSmallHeap
+ * @run main/othervm -XX:+UseShenandoahGC -Xms17m         TestLargePagesWithSmallHeap
+ *
+ * @run main/othervm -XX:+UseShenandoahGC -Xms17m -Xmx17m TestLargePagesWithSmallHeap
+ * @run main/othervm -XX:+UseShenandoahGC         -Xmx17m TestLargePagesWithSmallHeap
+ * @run main/othervm -XX:+UseShenandoahGC -Xms17m         TestLargePagesWithSmallHeap
+ */
+
+/*
+ * @test id=lp
+ * @requires vm.gc.Shenandoah
+ *
+ * @run main/othervm -XX:+UseShenandoahGC -XX:+UseLargePages -Xms17m -Xmx17m TestLargePagesWithSmallHeap
+ * @run main/othervm -XX:+UseShenandoahGC -XX:+UseLargePages         -Xmx17m TestLargePagesWithSmallHeap
+ * @run main/othervm -XX:+UseShenandoahGC -XX:+UseLargePages -Xms17m         TestLargePagesWithSmallHeap
+ *
+ * @run main/othervm -XX:+UseShenandoahGC -XX:+UseLargePages -Xms17m -Xmx17m TestLargePagesWithSmallHeap
+ * @run main/othervm -XX:+UseShenandoahGC -XX:+UseLargePages         -Xmx17m TestLargePagesWithSmallHeap
+ * @run main/othervm -XX:+UseShenandoahGC -XX:+UseLargePages -Xms17m         TestLargePagesWithSmallHeap
+ */
+
+/*
+ * @test id=thp
+ * @requires vm.gc.Shenandoah
+ * @requires os.family == "linux"
+ *
+ * @run main/othervm -XX:+UseShenandoahGC -XX:+UseTransparentHugePages -Xms17m -Xmx17m TestLargePagesWithSmallHeap
+ * @run main/othervm -XX:+UseShenandoahGC -XX:+UseTransparentHugePages         -Xmx17m TestLargePagesWithSmallHeap
+ * @run main/othervm -XX:+UseShenandoahGC -XX:+UseTransparentHugePages -Xms17m         TestLargePagesWithSmallHeap
+ *
+ * @run main/othervm -XX:+UseShenandoahGC -XX:+UseTransparentHugePages -Xms17m -Xmx17m TestLargePagesWithSmallHeap
+ * @run main/othervm -XX:+UseShenandoahGC -XX:+UseTransparentHugePages         -Xmx17m TestLargePagesWithSmallHeap
+ * @run main/othervm -XX:+UseShenandoahGC -XX:+UseTransparentHugePages -Xms17m         TestLargePagesWithSmallHeap
+ */
+
+public class TestLargePagesWithSmallHeap {
+    public static void main(String[] args) {
+        // Everything is checked on initialization
+    }
+}