VirtualAllocCommitUncommitRecommit.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
 * 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).
 *
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 * 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 reserve/commit/uncommit/release of virtual memory and that we track it correctly
 * @key nmt jcmd
 * @library /testlibrary /testlibrary/whitebox
 * @build VirtualAllocCommitUncommitRecommit
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail VirtualAllocCommitUncommitRecommit
 *
 */

import com.oracle.java.testlibrary.*;

import sun.hotspot.WhiteBox;

public class VirtualAllocCommitUncommitRecommit {

    public static WhiteBox wb = WhiteBox.getWhiteBox();

    public static void main(String args[]) throws Exception {
        OutputAnalyzer output;
        long commitSize = 128 * 1024; // 128KB
        long reserveSize = 4 * 1024 * 1024; // 4096KB
        long addr;

        String pid = Integer.toString(ProcessTools.getProcessId());
        ProcessBuilder pb = new ProcessBuilder();

        boolean has_nmt_detail = wb.NMTIsDetailSupported();
        if (has_nmt_detail) {
            System.out.println("NMT detail support detected.");
        } else {
            System.out.println("NMT detail support not detected.");
        }

        // reserve
        addr = wb.NMTReserveMemory(reserveSize);
        pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid,
                "VM.native_memory", "detail" });

        output = new OutputAnalyzer(pb.start());
        output.shouldContain("Test (reserved=4096KB, committed=0KB)");
        if (has_nmt_detail) {
            output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
                    + Long.toHexString(addr + reserveSize)
                    + "\\] reserved 4096KB for Test");
        }

        long addrA = addr;
        long addrB = addr + commitSize;
        long addrC = addr + (2 * commitSize);
        long addrD = addr + (3 * commitSize);
        long addrE = addr + (4 * commitSize);
        long addrF = addr + (5 * commitSize);

        // commit ABCD
        wb.NMTCommitMemory(addrA, commitSize);
        wb.NMTCommitMemory(addrB, commitSize);
        wb.NMTCommitMemory(addrC, commitSize);
        wb.NMTCommitMemory(addrD, commitSize);

        output = new OutputAnalyzer(pb.start());
        output.shouldContain("Test (reserved=4096KB, committed=512KB)");

        if (has_nmt_detail) {
            output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
                    + Long.toHexString(addr + reserveSize)
                    + "\\] reserved 4096KB for Test");
        }
        // uncommit BC
        wb.NMTUncommitMemory(addrB, commitSize);
        wb.NMTUncommitMemory(addrC, commitSize);

        output = new OutputAnalyzer(pb.start());
        output.shouldContain("Test (reserved=4096KB, committed=256KB)");

        if (has_nmt_detail) {
            output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
                    + Long.toHexString(addr + reserveSize)
                    + "\\] reserved 4096KB for Test");
        }

        // commit EF
        wb.NMTCommitMemory(addrE, commitSize);
        wb.NMTCommitMemory(addrF, commitSize);

        output = new OutputAnalyzer(pb.start());
        output.shouldContain("Test (reserved=4096KB, committed=512KB)");
        if (has_nmt_detail) {
            output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
                    + Long.toHexString(addr + reserveSize)
                    + "\\] reserved 4096KB for Test");
        }

        // uncommit A
        wb.NMTUncommitMemory(addrA, commitSize);

        output = new OutputAnalyzer(pb.start());
        output.shouldContain("Test (reserved=4096KB, committed=384KB)");
        if (has_nmt_detail) {
            output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
                    + Long.toHexString(addr + reserveSize)
                    + "\\] reserved 4096KB for Test");
        }

        // commit ABC
        wb.NMTCommitMemory(addrA, commitSize);
        wb.NMTCommitMemory(addrB, commitSize);
        wb.NMTCommitMemory(addrC, commitSize);

        output = new OutputAnalyzer(pb.start());
        output.shouldContain("Test (reserved=4096KB, committed=768KB)");
        if (has_nmt_detail) {
            output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
                    + Long.toHexString(addr + reserveSize)
                    + "\\] reserved 4096KB for Test");
        }

        // uncommit ABCDEF
        wb.NMTUncommitMemory(addrA, commitSize);
        wb.NMTUncommitMemory(addrB, commitSize);
        wb.NMTUncommitMemory(addrC, commitSize);
        wb.NMTUncommitMemory(addrD, commitSize);
        wb.NMTUncommitMemory(addrE, commitSize);
        wb.NMTUncommitMemory(addrF, commitSize);

        output = new OutputAnalyzer(pb.start());
        output.shouldContain("Test (reserved=4096KB, committed=0KB)");
        if (has_nmt_detail) {
            output.shouldMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
                    + Long.toHexString(addr + reserveSize)
                    + "\\] reserved 4096KB for Test");
        }

        // release
        wb.NMTReleaseMemory(addr, reserveSize);
        output = new OutputAnalyzer(pb.start());
        output.shouldNotContain("Test (reserved=");
        output.shouldNotMatch("\\[0x[0]*" + Long.toHexString(addr) + " - 0x[0]*"
                + Long.toHexString(addr + reserveSize) + "\\] reserved 4096KB for Test");
    }
}