bde7570659
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
119 lines
4.5 KiB
Java
119 lines
4.5 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server;
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import android.content.ContentResolver;
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import android.os.DropBoxManager;
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import android.os.FileObserver;
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import android.os.Binder;
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import android.util.Slog;
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import android.content.Context;
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import android.database.ContentObserver;
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import android.os.SystemProperties;
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import android.provider.Settings;
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import com.android.internal.os.SamplingProfilerIntegration;
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import java.io.File;
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import java.io.FileDescriptor;
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import java.io.IOException;
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import java.io.PrintWriter;
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public class SamplingProfilerService extends Binder {
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private static final String TAG = "SamplingProfilerService";
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private static final boolean LOCAL_LOGV = false;
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public static final String SNAPSHOT_DIR = SamplingProfilerIntegration.SNAPSHOT_DIR;
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private FileObserver snapshotObserver;
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public SamplingProfilerService(Context context) {
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registerSettingObserver(context);
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startWorking(context);
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}
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private void startWorking(Context context) {
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if (LOCAL_LOGV) Slog.v(TAG, "starting SamplingProfilerService!");
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final DropBoxManager dropbox =
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(DropBoxManager) context.getSystemService(Context.DROPBOX_SERVICE);
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// before FileObserver is ready, there could have already been some snapshots
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// in the directory, we don't want to miss them
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File[] snapshotFiles = new File(SNAPSHOT_DIR).listFiles();
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for (int i = 0; snapshotFiles != null && i < snapshotFiles.length; i++) {
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handleSnapshotFile(snapshotFiles[i], dropbox);
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}
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// detect new snapshot and put it in dropbox
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// delete it afterwards no matter what happened before
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// Note: needs listening at event ATTRIB rather than CLOSE_WRITE, because we set the
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// readability of snapshot files after writing them!
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snapshotObserver = new FileObserver(SNAPSHOT_DIR, FileObserver.ATTRIB) {
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@Override
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public void onEvent(int event, String path) {
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handleSnapshotFile(new File(SNAPSHOT_DIR, path), dropbox);
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}
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};
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snapshotObserver.startWatching();
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if (LOCAL_LOGV) Slog.v(TAG, "SamplingProfilerService activated");
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}
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private void handleSnapshotFile(File file, DropBoxManager dropbox) {
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try {
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dropbox.addFile(TAG, file, 0);
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if (LOCAL_LOGV) Slog.v(TAG, file.getPath() + " added to dropbox");
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} catch (IOException e) {
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Slog.e(TAG, "Can't add " + file.getPath() + " to dropbox", e);
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} finally {
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file.delete();
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}
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}
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private void registerSettingObserver(Context context) {
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ContentResolver contentResolver = context.getContentResolver();
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contentResolver.registerContentObserver(
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Settings.Secure.getUriFor(Settings.Secure.SAMPLING_PROFILER_HZ),
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false, new SamplingProfilerSettingsObserver(contentResolver));
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}
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@Override
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protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
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pw.println("SamplingProfilerService:");
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pw.println("Watching directory: " + SNAPSHOT_DIR);
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}
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private class SamplingProfilerSettingsObserver extends ContentObserver {
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private ContentResolver mContentResolver;
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public SamplingProfilerSettingsObserver(ContentResolver contentResolver) {
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super(null);
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mContentResolver = contentResolver;
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onChange(false);
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}
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@Override
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public void onChange(boolean selfChange) {
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Integer samplingProfilerHz = Settings.Secure.getInt(
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mContentResolver, Settings.Secure.SAMPLING_PROFILER_HZ, 0);
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// setting this secure property will start or stop sampling profiler,
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// as well as adjust the frequency of taking snapshots.
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SystemProperties.set("persist.sys.profiler_hz", samplingProfilerHz.toString());
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}
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}
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}
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