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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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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 /../../test/lib

 * @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();

        // 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)");

        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)");

        // uncommit BC

        wb.NMTUncommitMemory(addrB, commitSize);

        wb.NMTUncommitMemory(addrC, commitSize);

        output = new OutputAnalyzer(pb.start());

        output.shouldContain("Test (reserved=4096KB, committed=256KB)");

        // commit EF

        wb.NMTCommitMemory(addrE, commitSize);

        wb.NMTCommitMemory(addrF, commitSize);

        output = new OutputAnalyzer(pb.start());

        output.shouldContain("Test (reserved=4096KB, committed=512KB)");

        // uncommit A

        wb.NMTUncommitMemory(addrA, commitSize);

        output = new OutputAnalyzer(pb.start());

        output.shouldContain("Test (reserved=4096KB, committed=384KB)");

        // 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)");

        // 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)");

        // 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");

    }

}