一、Performance.java

本来想查看 proc/stat文件的，居然发现系统源码还有如此好东西，即查看浏览网页的各种事件计算，进行辅助性能分析。

有需要的童鞋拿去吧，我只是搬运工

String performanceString =    "It took total " + (SystemClock.uptimeMillis() - mStart)            + " ms clock time to load the page." + "\nbrowser process used "            + (Process.getElapsedCpuTime() - mProcessStart)            + " ms, user processes used " + (sysCpu[0] + sysCpu[1] - mUserStart)            * 10 + " ms, kernel used " + (sysCpu[2] - mSystemStart) * 10            + " ms, idle took " + (sysCpu[3] - mIdleStart) * 10            + " ms and irq took " + (sysCpu[4] + sysCpu[5] + sysCpu[6] - mIrqStart)            * 10 + " ms, " + uiInfo;

二、具体源码

/packages/apps/Browser/src/com/android/browser/Performance.java

/* * 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.browser;import android.net.WebAddress;import android.os.Debug;import android.os.Process;import android.os.SystemClock;import android.util.Log;/** * Performance analysis */public class Performance {
       private static final String LOGTAG = "browser";    private final static boolean LOGD_ENABLED =            com.android.browser.Browser.LOGD_ENABLED;    private static boolean mInTrace;    // Performance probe    private static final int[] SYSTEM_CPU_FORMAT = new int[] {            Process.PROC_SPACE_TERM | Process.PROC_COMBINE,            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG, // 1: user time            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG, // 2: nice time            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG, // 3: sys time            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG, // 4: idle time            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG, // 5: iowait time            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG, // 6: irq time            Process.PROC_SPACE_TERM | Process.PROC_OUT_LONG  // 7: softirq time    };    private static long mStart;    private static long mProcessStart;    private static long mUserStart;    private static long mSystemStart;    private static long mIdleStart;    private static long mIrqStart;    private static long mUiStart;    static void tracePageStart(String url) {        if (BrowserSettings.getInstance().isTracing()) {            String host;            try {                WebAddress uri = new WebAddress(url);                host = uri.getHost();            } catch (android.net.ParseException ex) {                host = "browser";            }            host = host.replace('.', '_');            host += ".trace";            mInTrace = true;            Debug.startMethodTracing(host, 20 * 1024 * 1024);        }    }    static void tracePageFinished() {        if (mInTrace) {            mInTrace = false;            Debug.stopMethodTracing();        }    }    static void onPageStarted() {        mStart = SystemClock.uptimeMillis();        mProcessStart = Process.getElapsedCpuTime();        long[] sysCpu = new long[7];        if (Process.readProcFile("/proc/stat", SYSTEM_CPU_FORMAT, null, sysCpu, null)) {            mUserStart = sysCpu[0] + sysCpu[1];            mSystemStart = sysCpu[2];            mIdleStart = sysCpu[3];            mIrqStart = sysCpu[4] + sysCpu[5] + sysCpu[6];        }        mUiStart = SystemClock.currentThreadTimeMillis();    }    static void onPageFinished(String url) {        long[] sysCpu = new long[7];        if (Process.readProcFile("/proc/stat", SYSTEM_CPU_FORMAT, null, sysCpu, null)) {            String uiInfo =                    "UI thread used " + (SystemClock.currentThreadTimeMillis() - mUiStart) + " ms";            if (LOGD_ENABLED) {                Log.d(LOGTAG, uiInfo);            }            // The string that gets written to the log            String performanceString =                    "It took total " + (SystemClock.uptimeMillis() - mStart)                            + " ms clock time to load the page." + "\nbrowser process used "                            + (Process.getElapsedCpuTime() - mProcessStart)                            + " ms, user processes used " + (sysCpu[0] + sysCpu[1] - mUserStart)                            * 10 + " ms, kernel used " + (sysCpu[2] - mSystemStart) * 10                            + " ms, idle took " + (sysCpu[3] - mIdleStart) * 10                            + " ms and irq took " + (sysCpu[4] + sysCpu[5] + sysCpu[6] - mIrqStart)                            * 10 + " ms, " + uiInfo;            if (LOGD_ENABLED) {                Log.d(LOGTAG, performanceString + "\nWebpage: " + url);            }            if (url != null) {                // strip the url to maintain consistency                String newUrl = new String(url);                if (newUrl.startsWith("http://www.")) {                    newUrl = newUrl.substring(11);                } else if (newUrl.startsWith("http://")) {                    newUrl = newUrl.substring(7);                } else if (newUrl.startsWith("https://www.")) {                    newUrl = newUrl.substring(12);                } else if (newUrl.startsWith("https://")) {                    newUrl = newUrl.substring(8);                }                if (LOGD_ENABLED) {                    Log.d(LOGTAG, newUrl + " loaded");                }            }        }    }}

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