changeset 39617:b8df29d17f9c

8132715: Add tests which check that no allocations allowed in any of humongous regions Reviewed-by: dfazunen, tschatzl
author kzhaldyb
date Wed, 29 Jun 2016 17:01:55 +0300
parents f82b1f888578
children ced8c3f59678 905b6eee37b3
files hotspot/test/gc/g1/humongousObjects/TestNoAllocationsInHRegions.java
diffstat 1 files changed, 234 insertions(+), 0 deletions(-) [+]
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/gc/g1/humongousObjects/TestNoAllocationsInHRegions.java	Wed Jun 29 17:01:55 2016 +0300
@@ -0,0 +1,234 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * 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).
+ *
+ * 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.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+package gc.g1.humongousObjects;
+
+import jdk.test.lib.Utils;
+import sun.hotspot.WhiteBox;
+
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Random;
+import java.util.stream.Collectors;
+
+/**
+ * @test TestNoAllocationsInHRegions
+ * @summary Checks that no additional allocations are made in humongous regions
+ * @requires vm.gc.G1
+ * @library /testlibrary /test/lib /
+ * @modules java.management java.base/jdk.internal.misc
+ * @build sun.hotspot.WhiteBox
+ *        gc.testlibrary.Helpers
+ *        gc.g1.humongousObjects.TestNoAllocationsInHRegions
+ *
+ * @run driver ClassFileInstaller sun.hotspot.WhiteBox
+ *      sun.hotspot.WhiteBox$WhiteBoxPermission
+ *
+ * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ *                   -XX:G1HeapRegionSize=1M -Xms200m -Xmx200m -XX:MaxTenuringThreshold=0
+ *                   -Xlog:gc=trace:file=TestNoAllocationsInHRegions10.log
+ *                   gc.g1.humongousObjects.TestNoAllocationsInHRegions 30 10
+ *
+ * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ *                   -XX:G1HeapRegionSize=1M -Xms200m -Xmx200m -XX:MaxTenuringThreshold=0
+ *                   -Xlog:gc=trace:file=TestNoAllocationsInHRegions50.log
+ *                   gc.g1.humongousObjects.TestNoAllocationsInHRegions 30 50
+ *
+ * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ *                   -XX:G1HeapRegionSize=1M -Xms200m -Xmx200m -XX:MaxTenuringThreshold=0
+ *                   -Xlog:gc=trace:file=TestNoAllocationsInHRegions70.log
+ *                   gc.g1.humongousObjects.TestNoAllocationsInHRegions 30 70
+ */
+public class TestNoAllocationsInHRegions {
+    private static final WhiteBox WB = WhiteBox.getWhiteBox();
+    private static final Random RND = Utils.getRandomInstance();
+    private static final int G1_REGION_SIZE = WB.g1RegionSize();
+    private static final int[] HUMONGOUS_SIZES = {G1_REGION_SIZE / 2, G1_REGION_SIZE + 1, G1_REGION_SIZE * 2 + 1};
+    private static final int ALLOC_THREAD_COUNT = 5;
+
+    // We fill specified part of heap with humongous objects - we need public static to prevent escape analysis to
+    // collect this field
+    public static LinkedList<byte[]> humongousAllocations = new LinkedList<>();
+
+    private static volatile boolean shouldStop = false;
+    private static volatile Error error = null;
+
+    static class Allocator implements Runnable {
+
+        private final List<byte[]> liveObjects = new LinkedList<>();
+        private int usedMemory = 0;
+        public final Runnable[] actions;
+
+        /**
+         * Maximum size of simple allocation
+         */
+        private static final int MAX_ALLOCATION_SIZE = (int) (G1_REGION_SIZE / 2 * 0.9);
+
+        /**
+         * Maximum size of dead (i.e. one which is made unreachable right after allocation) object
+         */
+        private static final int DEAD_OBJECT_MAX_SIZE = G1_REGION_SIZE / 10;
+
+        public Allocator(int maxAllocationMemory) {
+
+            actions = new Runnable[]{
+                    // Allocation
+                    () -> {
+                        if (maxAllocationMemory - usedMemory != 0) {
+                            int arraySize = RND.nextInt(Math.min(maxAllocationMemory - usedMemory,
+                                    MAX_ALLOCATION_SIZE));
+
+                            if (arraySize != 0) {
+                                byte[] allocation = new byte[arraySize];
+                                liveObjects.add(allocation);
+                                usedMemory += arraySize;
+
+                                // Sanity check
+                                if (WB.g1IsHumongous(allocation)) {
+                                    String errorMessage = String.format("Test Bug: Byte array of size"
+                                                    + " %d is expected to be non-humongous but it is humongous",
+                                            allocation.length);
+
+                                    System.out.println(errorMessage);
+                                    error = new Error(errorMessage);
+                                    shouldStop = true;
+                                }
+
+                                // Test check
+                                if (WB.g1BelongsToHumongousRegion(WB.getObjectAddress(allocation))) {
+                                    String errorMessage = String.format("Non-humongous allocation of byte array of "
+                                            + "length %d and size %d with address %d was made in Humongous Region",
+                                            allocation.length, WB.getObjectSize(allocation),
+                                            WB.getObjectAddress(allocation));
+
+                                    System.out.println(errorMessage);
+                                    error = new Error(errorMessage);
+                                    shouldStop = true;
+                                }
+                            }
+                        }
+                    },
+
+                    // Deallocation
+                    () -> {
+                        if (liveObjects.size() != 0) {
+                            int elementNum = RND.nextInt(liveObjects.size());
+                            int shouldFree = liveObjects.get(elementNum).length;
+                            liveObjects.remove(elementNum);
+                            usedMemory -= shouldFree;
+                        }
+                    },
+
+                    // Dead object allocation
+                    () -> {
+                        int size = RND.nextInt(DEAD_OBJECT_MAX_SIZE);
+                        byte[] deadObject = new byte[size];
+                    },
+
+                    // Check
+                    () -> {
+                        List<byte[]> wrongHumongousAllocations = liveObjects.stream()
+                                .filter(WB::g1IsHumongous)
+                                .collect(Collectors.toList());
+
+                        if (wrongHumongousAllocations.size() > 0) {
+                            wrongHumongousAllocations.stream().forEach(a ->
+                                    System.out.format("Non-humongous allocation of byte array of length %d and"
+                                                    + " size %d with address %d was made in Humongous Region",
+                                            a.length, WB.getObjectSize(a), WB.getObjectAddress(a)));
+                            error = new Error("Some non-humongous allocations were made to humongous region");
+                            shouldStop = true;
+                        }
+                    }
+            };
+        }
+
+        @Override
+        public void run() {
+            while (!shouldStop) {
+                actions[RND.nextInt(actions.length)].run();
+                Thread.yield();
+            }
+        }
+    }
+
+    public static void main(String[] args) {
+        if (args.length != 2) {
+            throw new Error("Test Bug: Expected duration (in seconds) and percent of allocated regions were not "
+                    + "provided as command line argument");
+        }
+
+        // test duration
+        long duration = Integer.parseInt(args[0]) * 1000L;
+        // part of heap preallocated with humongous objects (in percents)
+        int percentOfAllocatedHeap = Integer.parseInt(args[1]);
+
+        long startTime = System.currentTimeMillis();
+
+        long initialFreeRegionsCount = WB.g1NumFreeRegions();
+        int regionsToAllocate = (int) ((double) initialFreeRegionsCount / 100.0 * percentOfAllocatedHeap);
+        long freeRegionLeft = initialFreeRegionsCount - regionsToAllocate;
+
+        System.out.println("Regions to allocate: " + regionsToAllocate + "; regions to left free: " + freeRegionLeft);
+
+        int maxMemoryPerAllocThread = (int) ((Runtime.getRuntime().freeMemory() / 100.0
+                * (100 - percentOfAllocatedHeap)) / ALLOC_THREAD_COUNT * 0.5);
+
+        System.out.println("Using " + maxMemoryPerAllocThread / 1024 + "KB for each of " + ALLOC_THREAD_COUNT
+                + " allocation threads");
+
+        while (WB.g1NumFreeRegions() > freeRegionLeft) {
+            try {
+                humongousAllocations.add(new byte[HUMONGOUS_SIZES[RND.nextInt(HUMONGOUS_SIZES.length)]]);
+            } catch (OutOfMemoryError oom) {
+                //We got OOM trying to fill heap with humongous objects
+                //It probably means that heap is fragmented which is strange since the test logic should avoid it
+                System.out.println("Warning: OOM while allocating humongous objects - it likely means "
+                        + "that heap is fragmented");
+                break;
+            }
+        }
+
+        System.out.println("Initial free regions " + initialFreeRegionsCount + "; Free regions left "
+                + WB.g1NumFreeRegions());
+
+        LinkedList<Thread> threads = new LinkedList<>();
+
+        for (int i = 0; i < ALLOC_THREAD_COUNT; i++) {
+            threads.add(new Thread(new Allocator(maxMemoryPerAllocThread)));
+        }
+
+        threads.stream().forEach(Thread::start);
+
+        while ((System.currentTimeMillis() - startTime < duration) && error == null) {
+            Thread.yield();
+        }
+
+        shouldStop = true;
+        System.out.println("Finished test");
+        if (error != null) {
+            throw error;
+        }
+    }
+}