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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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/*

 * @test TestSmallInitialHeapWithLargePageAndNUMA

 * @bug 8023905

 * @requires os.family == "linux"

 * @requires vm.gc.Parallel

 * @summary Check large pages and NUMA are working together via the output message.

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 * @modules java.management/sun.management

 * @build TestSmallInitialHeapWithLargePageAndNUMA

 * @run main/othervm -Xbootclasspath/a:. -XX:+UseHugeTLBFS -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI TestSmallInitialHeapWithLargePageAndNUMA

*/

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

import sun.hotspot.WhiteBox;

public class TestSmallInitialHeapWithLargePageAndNUMA {

  private static final String MSG_EXIT_TOO_SMALL_HEAP = "Failed initializing NUMA with large pages. Too small heap size";

  private static final String MSG_GC_TRIGGERED_BEFORE_INIT = "GC triggered before VM initialization completed.";

  public static void main(String[] args) throws Exception {

    WhiteBox wb = WhiteBox.getWhiteBox();

    long heapAlignment = wb.getHeapAlignment();

    // When using large pages, Linux does not support freeing parts of reserved and committed memory.

    // And current Linux implementation uses page size as a condition to actually freeing memory.

    // If we allocate pages less than NUMA node, NUMA will try to use default page size and

    // this will free the memory which Linux does not support.

    // Assume the minimum NUMA node as 2.

    long initHeap = heapAlignment;

    long maxHeap = heapAlignment * 2;

    String[] vmArgs = {"-XX:+UseParallelGC",

                       "-Xms" + String.valueOf(initHeap),

                       "-Xmx" + String.valueOf(maxHeap),

                       "-XX:+UseNUMA",

                       "-XX:+UseHugeTLBFS",

                       "-XX:+PrintFlagsFinal",

                       "-version"};

    ProcessBuilder pb_enabled = ProcessTools.createJavaProcessBuilder(vmArgs);

    OutputAnalyzer analyzer = new OutputAnalyzer(pb_enabled.start());

    if (largePageOrNumaEnabled(analyzer)) {

      // We reach here, if both NUMA and HugeTLB are supported.

      // However final flags will not be printed as NUMA initialization will be failed.

      checkAnalyzerValues(analyzer, 1, MSG_EXIT_TOO_SMALL_HEAP);

    }

  }

  // If both NUMA and large pages are enabled, VM will exit during NUMA initialization

  // under the small heap configuration. So final flags will not be printed.

  private static boolean largePageOrNumaEnabled(OutputAnalyzer analyzer) {

    String output = analyzer.getOutput();

    return !output.contains("[Global flags]");

  }

  // We need to test with small heap but fastdebug binary fails to initialize because of the small heap.

  // So skip that case.

  private static void checkAnalyzerValues(OutputAnalyzer analyzer, int expectedExitValue, String expectedMessage) {

    String output = analyzer.getOutput();

    // If the VM exits because of the small heap, skip checking the exit value.

    if (!output.contains(MSG_GC_TRIGGERED_BEFORE_INIT)) {

      analyzer.shouldHaveExitValue(expectedExitValue);

    }

    if (expectedMessage != null) {

      analyzer.shouldContain(expectedMessage);

    }

  }

}