Added support for -XX:HeapGrowthLimit switch

Runtime can now take in a growth limit for the heap, which can be
smaller than the maximum size of the heap, and will prevent the heap
from growing beyond that size. The growth limit can also be cleared to
increase the size of the heap to the specified maximum size. This gives
apps some control of the size of the heap, but should be removed when we
have better ways to resize the heap.

Change-Id: I338655bccd20bfd32e2318365f0f3283dbaaab1e

1 files changed, 57 insertions, 0 deletions

diff --git a/test/GrowthLimit/GrowthLimit.java b/test/GrowthLimit/GrowthLimit.java
new file mode 100644
index 0000000..32537d6
--- /dev/null
+++ b/test/GrowthLimit/GrowthLimit.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class GrowthLimit {
+
+    public static void main(String[] args) throws Exception {
+
+        int alloc1 = 1;
+        try {
+            List<byte[]> l = new ArrayList<byte[]>();
+            while (true) {
+                // Allocate a MB at a time
+                l.add(new byte[1048576]);
+                alloc1++;
+            }
+        } catch (OutOfMemoryError e) {
+        }
+        // Expand the heap to the maximum size
+        dalvik.system.VMRuntime.getRuntime().clearGrowthLimit();
+
+        int alloc2 = 1;
+        try {
+            List<byte[]> l = new ArrayList<byte[]>();
+            while (true) {
+                // Allocate a MB at a time
+                l.add(new byte[1048576]);
+                alloc2++;
+            }
+        } catch (OutOfMemoryError e2) {
+            if (alloc1 > alloc2) {
+                System.out.println("ERROR: Allocated less memory after growth" +
+                    "limit cleared (" + alloc1 + " MBs > " + alloc2 + " MBs");
+                System.exit(1);
+            }
+        }
+    }
+}