wire up sampling profiler to dropbox
When system property "persist.sys.profiler_hz" > 0, SamplingProfilerService is
loaded to SystemServer. It creates a FileObserver, watching any new file in the snapshot
directory. When a snapshot is found, it is put in dropbox and deleted after that.
SamplingProfilerIntegration writes snapshots with headers. Headers are <name, value> pairs,
instantiated by caller.
Currently header format is (also in source comment):
Version: <version number of profiler>\n
Process: <process name>\n
Package: <package name, if exists>\n
Package-Version: <version number of the package, if exists>\n
Build: <fingerprint>\n
\n
<the actual snapshot content begins here...>
BUG=2732642
Change-Id: I2c1699f1728e603de13dbd38f9d8443cd3eecc06
diff --git a/services/java/com/android/server/SamplingProfilerService.java b/services/java/com/android/server/SamplingProfilerService.java
new file mode 100644
index 0000000..26af7f7
--- /dev/null
+++ b/services/java/com/android/server/SamplingProfilerService.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2010 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.server;
+
+import android.content.ContentResolver;
+import android.os.DropBoxManager;
+import android.os.FileObserver;
+import android.os.Binder;
+
+import android.util.Slog;
+import android.content.Context;
+import android.database.ContentObserver;
+import android.os.SystemProperties;
+import android.provider.Settings;
+import com.android.internal.os.SamplingProfilerIntegration;
+
+import java.io.File;
+import java.io.FileDescriptor;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+public class SamplingProfilerService extends Binder {
+
+ private static final String TAG = "SamplingProfilerService";
+ private static final boolean LOCAL_LOGV = false;
+ public static final String SNAPSHOT_DIR = SamplingProfilerIntegration.SNAPSHOT_DIR;
+
+ private FileObserver snapshotObserver;
+
+ public SamplingProfilerService(Context context) {
+ registerSettingObserver(context);
+ startWorking(context);
+ }
+
+ private void startWorking(Context context) {
+ if (LOCAL_LOGV) Slog.v(TAG, "starting SamplingProfilerService!");
+
+ final DropBoxManager dropbox =
+ (DropBoxManager) context.getSystemService(Context.DROPBOX_SERVICE);
+
+ // before FileObserver is ready, there could have already been some snapshots
+ // in the directory, we don't want to miss them
+ File[] snapshotFiles = new File(SNAPSHOT_DIR).listFiles();
+ for (int i = 0; snapshotFiles != null && i < snapshotFiles.length; i++) {
+ handleSnapshotFile(snapshotFiles[i], dropbox);
+ }
+
+ // detect new snapshot and put it in dropbox
+ // delete it afterwards no matter what happened before
+ // Note: needs listening at event ATTRIB rather than CLOSE_WRITE, because we set the
+ // readability of snapshot files after writing them!
+ snapshotObserver = new FileObserver(SNAPSHOT_DIR, FileObserver.ATTRIB) {
+ @Override
+ public void onEvent(int event, String path) {
+ handleSnapshotFile(new File(SNAPSHOT_DIR, path), dropbox);
+ }
+ };
+ snapshotObserver.startWatching();
+
+ if (LOCAL_LOGV) Slog.v(TAG, "SamplingProfilerService activated");
+ }
+
+ private void handleSnapshotFile(File file, DropBoxManager dropbox) {
+ try {
+ dropbox.addFile(TAG, file, 0);
+ if (LOCAL_LOGV) Slog.v(TAG, file.getPath() + " added to dropbox");
+ } catch (IOException e) {
+ Slog.e(TAG, "Can't add " + file.getPath() + " to dropbox", e);
+ } finally {
+ file.delete();
+ }
+ }
+
+ private void registerSettingObserver(Context context) {
+ ContentResolver contentResolver = context.getContentResolver();
+ contentResolver.registerContentObserver(
+ Settings.Secure.getUriFor(Settings.Secure.SAMPLING_PROFILER_HZ),
+ false, new SamplingProfilerSettingsObserver(contentResolver));
+ }
+
+ @Override
+ protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
+ pw.println("SamplingProfilerService:");
+ pw.println("Watching directory: " + SNAPSHOT_DIR);
+ }
+
+ private class SamplingProfilerSettingsObserver extends ContentObserver {
+ private ContentResolver mContentResolver;
+ public SamplingProfilerSettingsObserver(ContentResolver contentResolver) {
+ super(null);
+ mContentResolver = contentResolver;
+ onChange(false);
+ }
+ @Override
+ public void onChange(boolean selfChange) {
+ Integer samplingProfilerHz = Settings.Secure.getInt(
+ mContentResolver, Settings.Secure.SAMPLING_PROFILER_HZ, 0);
+ // setting this secure property will start or stop sampling profiler,
+ // as well as adjust the frequency of taking snapshots.
+ SystemProperties.set("persist.sys.profiler_hz", samplingProfilerHz.toString());
+ }
+ }
+}
+