jdk

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/*
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 * Copyright (c) 2014, 2024, Alibaba Group Holding Limited. All rights reserved.
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 * Copyright (c) 2024, Red Hat Inc.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package gc;
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/**
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 * @test id=ParallelCollector
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 * @summary tests AlwaysPreTouch
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 * @requires vm.gc.Parallel
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 * @requires os.maxMemory > 2G
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 * @requires os.family != "aix"
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 * @library /test/lib
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 * @build jdk.test.whitebox.WhiteBox
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 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx512m -Xms512m -XX:+UseParallelGC -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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 */
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 /**
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 * @test id=SerialCollector
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 * @summary tests AlwaysPreTouch
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 * @requires vm.gc.Serial
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 * @requires os.maxMemory > 2G
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 * @requires os.family != "aix"
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 * @library /test/lib
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 * @build jdk.test.whitebox.WhiteBox
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 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx512m -Xms512m -XX:+UseSerialGC -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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 */
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/**
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 * @test id=Shenandoah
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 * @summary tests AlwaysPreTouch
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 * @requires vm.gc.Shenandoah
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 * @requires os.maxMemory > 2G
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 * @requires os.family != "aix"
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 * @library /test/lib
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 * @build jdk.test.whitebox.WhiteBox
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 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx512m -Xms512m -XX:+UseShenandoahGC  -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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 */
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/**
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 * @test id=G1
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 * @summary tests AlwaysPreTouch
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 * @requires vm.gc.G1
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 * @requires os.maxMemory > 2G
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 * @requires os.family != "aix"
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 * @library /test/lib
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 * @build jdk.test.whitebox.WhiteBox
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 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx512m -Xms512m -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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 */
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/**
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 * @test id=ZGenerational
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 * @summary tests AlwaysPreTouch
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 * @requires vm.gc.ZGenerational
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 * @requires os.maxMemory > 2G
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 * @requires os.family != "aix"
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 * @library /test/lib
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 * @build jdk.test.whitebox.WhiteBox
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 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseZGC -XX:+ZGenerational -Xmx512m -Xms512m -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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 */
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/**
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 * @test id=ZSinglegen
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 * @summary tests AlwaysPreTouch
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 * @requires vm.gc.ZSinglegen
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 * @requires os.maxMemory > 2G
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 * @requires os.family != "aix"
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 * @library /test/lib
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 * @build jdk.test.whitebox.WhiteBox
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 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseZGC -XX:-ZGenerational -Xmx512m -Xms512m -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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 */
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/**
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 * @test id=Epsilon
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 * @summary tests AlwaysPreTouch
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 * @requires vm.gc.Epsilon
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 * @requires os.maxMemory > 2G
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 * @requires os.family != "aix"
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 * @library /test/lib
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 * @build jdk.test.whitebox.WhiteBox
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 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -Xmx512m -Xms512m -XX:+AlwaysPreTouch gc.TestAlwaysPreTouchBehavior
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 */
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import jdk.test.lib.Asserts;
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import jdk.test.whitebox.WhiteBox;
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public class TestAlwaysPreTouchBehavior {
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    public static void main(String [] args) {
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    long rss = WhiteBox.getWhiteBox().rss();
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    System.out.println("RSS: " + rss);
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    if (rss == 0) {
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        System.out.println("cannot get RSS, just skip");
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        return; // Did not get available RSS, just ignore this test.
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    }
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    Runtime runtime = Runtime.getRuntime();
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    long committedMemory = runtime.totalMemory();
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    Asserts.assertGreaterThan(rss, committedMemory, "RSS of this process(" + rss + "b) should be bigger than or equal to committed heap mem(" + committedMemory + "b)");
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   }
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}
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