Parse network stats using native code.

Switch to parsing detailed network stats with native code, which
is 71% faster than ProcFileReader.

Change-Id: I2525aaee74d227ce187ba3a74dd08a2b06514deb

1 files changed, 54 insertions, 0 deletions

diff --git a/core/tests/benchmarks/src/com/android/internal/net/NetworkStatsFactoryBenchmark.java b/core/tests/benchmarks/src/com/android/internal/net/NetworkStatsFactoryBenchmark.java
new file mode 100644
index 000000000000..2174be5dc0a3
--- /dev/null
+++ b/core/tests/benchmarks/src/com/android/internal/net/NetworkStatsFactoryBenchmark.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2012 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.
+ */
+
+package com.android.internal.net;
+
+import android.net.NetworkStats;
+import android.os.SystemClock;
+
+import com.google.caliper.SimpleBenchmark;
+
+import java.io.File;
+
+public class NetworkStatsFactoryBenchmark extends SimpleBenchmark {
+    private File mStats;
+
+    // TODO: consider staging stats file with different number of rows
+
+    @Override
+    protected void setUp() {
+        mStats = new File("/proc/net/xt_qtaguid/stats");
+    }
+
+    @Override
+    protected void tearDown() {
+        mStats = null;
+    }
+
+    public void timeReadNetworkStatsDetailJava(int reps) throws Exception {
+        for (int i = 0; i < reps; i++) {
+            NetworkStatsFactory.javaReadNetworkStatsDetail(mStats, NetworkStats.UID_ALL);
+        }
+    }
+
+    public void timeReadNetworkStatsDetailNative(int reps) {
+        for (int i = 0; i < reps; i++) {
+            final NetworkStats stats = new NetworkStats(SystemClock.elapsedRealtime(), 0);
+            NetworkStatsFactory.nativeReadNetworkStatsDetail(
+                    stats, mStats.getAbsolutePath(), NetworkStats.UID_ALL);
+        }
+    }
+}