test/hotspot/jtreg/runtime/NMT/SafepointPollingPages.java

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/**
 * @test
 * @bug 8208499
 * @summary NMT should report safepoint polling page(s)
 * @key nmt jcmd
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @comment On ppc, with UseSIGTRAP on, no polling pages are used, but trap instructions instead.
 * @run main/othervm -XX:-UseSIGTRAP -XX:+IgnoreUnrecognizedVMOptions -Xbootclasspath/a:. -XX:NativeMemoryTracking=summary -XX:+ThreadLocalHandshakes SafepointPollingPages
 * @run main/othervm -XX:-UseSIGTRAP -XX:+IgnoreUnrecognizedVMOptions -Xbootclasspath/a:. -XX:NativeMemoryTracking=summary -XX:-ThreadLocalHandshakes SafepointPollingPages
 */

import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.JDKToolFinder;
import jdk.internal.misc.Unsafe;

public class SafepointPollingPages {
  public static void main(String args[]) throws Exception {
    OutputAnalyzer output;

    // Grab my own PID
    String pid = Long.toString(ProcessTools.getProcessId());
    ProcessBuilder pb = new ProcessBuilder();

    // Run 'jcmd <pid> VM.native_memory summary'
    pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "summary"});
    output = new OutputAnalyzer(pb.start());
    output.shouldContain("Safepoint (reserved=");
  }
}