GC triggering performance optimizations

Copy the correct starting heap size at process init.
Interfaces to set GC/managed heap parameters.

Change-Id: If0b1637291e77f9781ae6249c5d0257f659253ca

1 files changed, 31 insertions, 0 deletions

diff --git a/dalvik/src/main/java/dalvik/system/VMRuntime.java b/dalvik/src/main/java/dalvik/system/VMRuntime.java
index 71098be..239a876 100644
--- a/dalvik/src/main/java/dalvik/system/VMRuntime.java
+++ b/dalvik/src/main/java/dalvik/system/VMRuntime.java
@@ -107,6 +107,31 @@ public final class VMRuntime {
     }
 
     /**
+     * @hide
+     */
+    public float setTargetHeapMinFree(int size) {
+        /* Synchronize to make sure that only one thread gets
+         * a given "old" value if both update at the same time.
+         * Allows for reliable save-and-restore semantics.
+         */
+        synchronized (this) {
+            return nativeSetTargetHeapMinFree(size);
+        }
+    }
+    /**
+     * @hide
+     */
+    public float setTargetHeapConcurrentStart(int size) {
+        /* Synchronize to make sure that only one thread gets
+         * a given "old" value if both update at the same time.
+         * Allows for reliable save-and-restore semantics.
+         */
+        synchronized (this) {
+            return nativeSetTargetHeapConcurrentStart(size);
+        }
+    }
+
+    /**
      * Sets the target SDK version. Should only be called before the
      * app starts to run, because it may change the VM's behavior in
      * dangerous ways. Use 0 to mean "current" (since callers won't
@@ -156,6 +181,12 @@ public final class VMRuntime {
      *                  This value may be adjusted internally.
      */
     private native void nativeSetTargetHeapUtilization(float newTarget);
+    /* @hide
+     */
+    private native int nativeSetTargetHeapMinFree(int size);
+    /* @hide
+     */
+    private native int nativeSetTargetHeapConcurrentStart(int size);
 
     /**
      * This method exists for binary compatibility.  It was part of