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/*

 * @test TestNewRatioFlag

 * @key gc

 * @bug 8025166

 * @summary Verify that heap devided among generations according to NewRatio

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

 *          java.management

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 * @run driver TestNewRatioFlag

 */

import java.util.Arrays;

import java.util.Collections;

import java.util.LinkedList;

import jdk.test.lib.Utils;

import sun.hotspot.WhiteBox;

public class TestNewRatioFlag {

    public static final long M = 1024 * 1024;

    public static final long HEAP_SIZE = 100 * M;

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

        LinkedList<String> options = new LinkedList<>(

                Arrays.asList(Utils.getFilteredTestJavaOpts("(-XX:[^ ]*NewSize=[^ ]+)|(-Xm[ns][^ ]+)"))

        );

        testNewRatio(4, options);

        testNewRatio(6, options);

        testNewRatio(10, options);

        testNewRatio(15, options);

        testNewRatio(20, options);

    }

    /**

     * Verify that actual size of young gen conforms specified NewRatio

     *

     * @param ratio value of NewRatio option

     * @param options additional options for VM

     */

    public static void testNewRatio(int ratio, LinkedList<String> options) throws Exception {

        LinkedList<String> vmOptions = new LinkedList<>(options);

        Collections.addAll(vmOptions,

                "-Xbootclasspath/a:.",

                "-XX:+UnlockDiagnosticVMOptions",

                "-XX:+WhiteBoxAPI",

                "-XX:GCLockerEdenExpansionPercent=0",

                "-Xmx" + HEAP_SIZE,

                "-Xms" + HEAP_SIZE,

                "-XX:NewRatio=" + ratio,

                "-XX:-UseLargePages",

                NewRatioVerifier.class.getName(),

                Integer.toString(ratio)

        );

        ProcessBuilder procBuilder = ProcessTools.createJavaProcessBuilder(vmOptions.toArray(new String[vmOptions.size()]));

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

        analyzer.shouldHaveExitValue(0);

        System.out.println(analyzer.getOutput());

    }

    public static class NewRatioVerifier {

        static WhiteBox wb = WhiteBox.getWhiteBox();

        public static void main(String args[]) {

            if (args.length != 1) {

                throw new IllegalArgumentException("Expected 1 arg: <expectedRatio>");

            }

            int expectedRatio = Integer.valueOf(args[0]);

            switch (GCTypes.YoungGCType.getYoungGCType()) {

                case DefNew:

                case ParNew:

                    verifyDefNewNewRatio(expectedRatio);

                    break;

                case PSNew:

                    verifyPSNewRatio(expectedRatio);

                    break;

                case G1:

                    verifyG1NewRatio(expectedRatio);

                    break;

                default:

                    throw new RuntimeException("Unexpected young GC type");

            }

        }

        /**

         * Verify NewSize for DefNew and ParNew collectors.

         *

         * Compare expected NewSize calculated according to sizing policies used by DefNew

         * with NewSize value reported by MemoryPoolMXBeans.

         */

        public static void verifyDefNewNewRatio(int expectedRatio) {

            long initEden = HeapRegionUsageTool.getEdenUsage().getInit();

            long initSurv = HeapRegionUsageTool.getSurvivorUsage().getInit();

            long initOld = HeapRegionUsageTool.getOldUsage().getInit();

            long newSize = initEden + 2 * initSurv;

            long expectedNewSize = HeapRegionUsageTool.alignDown(initOld / expectedRatio,

                    wb.getHeapSpaceAlignment());

            if (expectedNewSize != newSize) {

                throw new RuntimeException("Expected young gen size is: " + expectedNewSize

                        + ", but observed new size is: " + newSize);

            }

        }

        /**

         * Verify NewSize for PS collector.

         * Expected NewSize calculated according to alignment policies used by PS

         * and then compared with actual NewSize obtained from MemoryPoolMXBeans.

         */

        public static void verifyPSNewRatio(int expectedRatio) {

            long initEden = HeapRegionUsageTool.getEdenUsage().getInit();

            long initSurv = HeapRegionUsageTool.getSurvivorUsage().getInit();

            long initOld = HeapRegionUsageTool.getOldUsage().getInit();

            long newSize = initEden + 2 * initSurv;

            long alignedDownNewSize = HeapRegionUsageTool.alignDown(initOld / expectedRatio,

                    wb.getHeapSpaceAlignment());

            long expectedNewSize = HeapRegionUsageTool.alignUp(alignedDownNewSize,

                    wb.psVirtualSpaceAlignment());

            if (expectedNewSize != newSize) {

                throw new RuntimeException("Expected young gen size is: " + expectedNewSize

                        + ", but observed new size is: " + newSize);

            }

        }

        /**

         * Verify NewSize for G1 GC.

         * Amount of young regions calculated according to sizing policies used by G1

         * and then compared with actual number of young regions derived from

         * values reported by MemoryPoolMXBeans and region size.

         */

        public static void verifyG1NewRatio(int expectedRatio) {

            long initEden = HeapRegionUsageTool.getEdenUsage().getInit();

            long initSurv = HeapRegionUsageTool.getSurvivorUsage().getInit();

            long maxOld = HeapRegionUsageTool.getOldUsage().getMax();

            int regionSize = wb.g1RegionSize();

            int youngListLength = (int) ((initEden + initSurv) / regionSize);

            int maxRegions = (int) (maxOld / regionSize);

            int expectedYoungListLength = (int) (maxRegions / (double) (expectedRatio + 1));

            if (youngListLength != expectedYoungListLength) {

                throw new RuntimeException("Expected G1 young list length is: " + expectedYoungListLength

                        + ", but observed young list length is: " + youngListLength);

            }

        }

    }

}