commit 987ccff48fe2c0645756e1089608e4b6b7e9f7bf
author Mathieu Chartier <mathieuc@google.com> Mon Jul 08 11:05:21 2013 -0700
committer Mathieu Chartier <mathieuc@google.com> Fri Jul 12 13:33:04 2013 -0700
tree 3bbad0d24eb69e28454fc403c7e8be1a70af1230
parent df6df99847fc8e4914755f9b2b7d18897254240b

Native allocation accounting

Added two new functions: registerNativeAllocation and registerNativeFree.
These functions should be used to let the GC know about native allocations
which are held live by Java objects and released in finalizers. GC are performed
or requested from within registerNativeAllocation when the total number of native
bytes accounted for exceeds a certain threshold. After a GC occurs in
registerNativeAllocation, finalizers are run so that the native memory is freed.
Added a test which shows how to use these functions.

Change-Id: I40f3c79e1c02d5008dec7d58d61c5bb97ec2fc1b

src/native/dalvik_system_VMRuntime.cc

diff --git a/src/native/dalvik_system_VMRuntime.cc b/src/native/dalvik_system_VMRuntime.cc
index ce3cc93..baae8a3 100644
--- a/src/native/dalvik_system_VMRuntime.cc
+++ b/src/native/dalvik_system_VMRuntime.cc
@@ -165,6 +165,24 @@
   }
 }
 
+static void VMRuntime_registerNativeAllocation(JNIEnv* env, jobject, jint bytes) {
+  ScopedObjectAccess soa(env);
+  if (bytes < 0) {
+    ThrowRuntimeException("allocation size negative %d", bytes);
+    return;
+  }
+  Runtime::Current()->GetHeap()->RegisterNativeAllocation(bytes);
+}
+
+static void VMRuntime_registerNativeFree(JNIEnv* env, jobject, jint bytes) {
+  ScopedObjectAccess soa(env);
+  if (bytes < 0) {
+    ThrowRuntimeException("allocation size negative %d", bytes);
+    return;
+  }
+  Runtime::Current()->GetHeap()->RegisterNativeFree(bytes);
+}
+
 static void VMRuntime_trimHeap(JNIEnv*, jobject) {
   uint64_t start_ns = NanoTime();
 
@@ -210,10 +228,13 @@
   NATIVE_METHOD(VMRuntime, newNonMovableArray, "(Ljava/lang/Class;I)Ljava/lang/Object;"),
   NATIVE_METHOD(VMRuntime, properties, "()[Ljava/lang/String;"),
   NATIVE_METHOD(VMRuntime, setTargetSdkVersion, "(I)V"),
+  NATIVE_METHOD(VMRuntime, registerNativeAllocation, "(I)V"),
+  NATIVE_METHOD(VMRuntime, registerNativeFree, "(I)V"),
   NATIVE_METHOD(VMRuntime, startJitCompilation, "()V"),
   NATIVE_METHOD(VMRuntime, trimHeap, "()V"),
   NATIVE_METHOD(VMRuntime, vmVersion, "()Ljava/lang/String;"),
   NATIVE_METHOD(VMRuntime, vmLibrary, "()Ljava/lang/String;"),
+
 };
 
 void register_dalvik_system_VMRuntime(JNIEnv* env) {