test/runtime/NMT/MallocRoundingReportTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * 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.
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 */

/*
 * @test
 * @summary Test consistency of NMT by creating allocations of the Test type with various sizes and verifying visibility with jcmd
 * @key nmt jcmd
 * @library /testlibrary /testlibrary/whitebox
 * @build MallocRoundingReportTest
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocRoundingReportTest
 *
 */

import com.oracle.java.testlibrary.*;

import sun.hotspot.WhiteBox;

public class MallocRoundingReportTest {
    private static long K = 1024;

    public static void main(String args[]) throws Exception {
        OutputAnalyzer output;
        WhiteBox wb = WhiteBox.getWhiteBox();

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

        long[] additionalBytes = {0, 1, 512, 650};
        long[] kByteSize = {1024, 2048};
        long mallocd_total = 0;
        for ( int i = 0; i < kByteSize.length; i++)
        {
            for (int j = 0; j < (additionalBytes.length); j++) {
                long curKB = kByteSize[i] + additionalBytes[j];
                // round up/down to the nearest KB to match NMT reporting
                long numKB = (curKB % kByteSize[i] >= 512) ? ((curKB / K) + 1) : curKB / K;
                // Use WB API to alloc and free with the mtTest type
                mallocd_total = wb.NMTMalloc(curKB);
                // Run 'jcmd <pid> VM.native_memory summary', check for expected output
                // NMT does not track memory allocations less than 1KB, and rounds to the nearest KB
                String expectedOut = ("Test (reserved=" + numKB + "KB, committed=" + numKB + "KB)");

                pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "summary" });
                output = new OutputAnalyzer(pb.start());
                output.shouldContain(expectedOut);

                wb.NMTFree(mallocd_total);
                // Run 'jcmd <pid> VM.native_memory summary', check for expected output
                pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "summary" });
                output = new OutputAnalyzer(pb.start());
                output.shouldNotContain("Test (reserved=");
            }
        }
    }
}