8275608: runtime/Metaspace/elastic/TestMetaspaceAllocationMT2 too slow

Backport-of: d6d82f52d4a4fac037ee9424503f8b7f11a61c40

Author: tstuefe

test/hotspot/jtreg/runtime/Metaspace/elastic/MetaspaceTestArena.java

@@ -25,8 +25,6 @@
 
 import sun.hotspot.WhiteBox;
 
-import java.util.concurrent.atomic.AtomicLong;
-
 public class MetaspaceTestArena {
 
     long arena;
@@ -38,7 +36,7 @@ public class MetaspaceTestArena {
     long numAllocated = 0;
     long deallocatedWords = 0;
     long numDeallocated = 0;
-    long numAllocationFailures = 0;
+    volatile long numAllocationFailures = 0;
 
     private synchronized boolean reachedCeiling() {
         return (allocatedWords - deallocatedWords) > allocationCeiling;

test/hotspot/jtreg/runtime/Metaspace/elastic/MetaspaceTestManyArenasManyThreads.java

@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2020 SAP SE. All rights reserved.
+ * Copyright (c) 2021 SAP SE. All rights reserved.
+ * Copyright (c) 2021, 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
@@ -63,7 +63,7 @@ public void runTest() throws Exception {
             Thread.sleep(200);
 
             for (RandomAllocatorThread t: threads) {
-                if (t.allocator.arena.numAllocationFailures > 0) {
+                if (t.allocator.arena.numAllocationFailures > 1000) {
                     t.interrupt();
                     t.join();
                     context.destroyArena(t.allocator.arena);

test/hotspot/jtreg/runtime/Metaspace/elastic/MetaspaceTestWithThreads.java

@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2020 SAP SE. All rights reserved.
+ * Copyright (c) 2021 SAP SE. All rights reserved.
+ * Copyright (c) 2021, 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
@@ -23,8 +23,6 @@
  *
  */
 
-import java.util.Set;
-
 public class MetaspaceTestWithThreads {
 
     // The context to use.
@@ -53,6 +51,8 @@ protected void stopAllThreads() throws InterruptedException {
         // Stop all threads.
         for (Thread t: threads) {
             t.interrupt();
+        }
+        for (Thread t: threads) {
             t.join();
         }
     }

test/hotspot/jtreg/runtime/Metaspace/elastic/RandomAllocator.java

@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2020 SAP SE. All rights reserved.
+ * Copyright (c) 2021 SAP SE. All rights reserved.
+ * Copyright (c) 2021, 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
@@ -46,7 +46,11 @@ public class RandomAllocator {
     ArrayList<Allocation> to_dealloc = new ArrayList<>();
 
     long ticks = 0;
-    boolean allocationError = false;
+
+    // Allocate (breathe in) until arena is full, then - to test the arena deallocator - deallocate some allocations
+    // and breathe in again until full.
+    boolean breatheIn = true;
+    int breatheOutTicks = 0;
 
     Random localRandom;
 
@@ -57,15 +61,16 @@ private boolean rollDice(double probability) {
 
     // Allocate a random amount from the arena. If dice hits right, add this to the deallocation list.
     void allocateRandomly() {
-        allocationError = false;
         long word_size = profile.randomAllocationSize();
         Allocation a = arena.allocate(word_size);
         if (a != null) {
             if (to_dealloc.size() < 10000) {
                 to_dealloc.add(a);
             }
         } else {
-            allocationError = true;
+            // On allocation error, breathe out a bit
+            breatheIn = false;
+            breatheOutTicks = 0;
         }
     }
 
@@ -80,19 +85,20 @@ void deallocateRandomly() {
     }
 
     public void tick() {
-
-        if (!allocationError) {
+        if (breatheIn) {
+            // allocate until we hit the ceiling
             allocateRandomly();
-            if(rollDice(profile.randomDeallocProbability)) {
+            if (rollDice(profile.randomDeallocProbability)) {
                deallocateRandomly();
             }
         } else {
-            deallocateRandomly();
-            allocationError = false;
+            if (++breatheOutTicks < 100) {
+                deallocateRandomly();
+            } else {
+                breatheIn = true;
+            }
         }
-
         ticks ++;
-
     }
 
     public RandomAllocator(MetaspaceTestArena arena) {
@@ -102,6 +108,10 @@ public RandomAllocator(MetaspaceTestArena arena) {
         this.localRandom = new Random(RandomHelper.random().nextInt());
     }
 
+    long numAllocationFailures() {
+        return arena.numAllocationFailures;
+    }
+
     @Override
     public String toString() {
         return  arena.toString() + ", ticks=" + ticks;

test/hotspot/jtreg/runtime/Metaspace/elastic/RandomAllocatorThread.java

@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2020 SAP SE. All rights reserved.
+ * Copyright (c) 2021 SAP SE. All rights reserved.
+ * Copyright (c) 2021, 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
@@ -23,7 +23,6 @@
  *
  */
 
-import java.util.Random;
 import java.util.concurrent.BrokenBarrierException;
 import java.util.concurrent.CyclicBarrier;
 
@@ -55,9 +54,7 @@ public void run() {
         }
 
         while (!Thread.interrupted()) {
-            for (int i = 0; i < 1000; i++) {
-                allocator.tick();
-            }
+            allocator.tick();
         }
 
         // System.out.println("+ [" + id + "] " + allocator);