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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* Copyright (C) 2007 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.os;
import static android.os.Process.*;
import android.annotation.UnsupportedAppUsage;
import android.os.Process;
import android.os.StrictMode;
import android.os.SystemClock;
import android.system.ErrnoException;
import android.system.Os;
import android.system.OsConstants;
import android.util.Slog;
import com.android.internal.util.FastPrintWriter;
import java.io.File;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
public class ProcessCpuTracker {
private static final String TAG = "ProcessCpuTracker";
private static final boolean DEBUG = false;
private static final boolean localLOGV = DEBUG || false;
private static final int[] PROCESS_STATS_FORMAT = new int[] {
PROC_SPACE_TERM,
PROC_SPACE_TERM|PROC_PARENS,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM|PROC_OUT_LONG, // 10: minor faults
PROC_SPACE_TERM,
PROC_SPACE_TERM|PROC_OUT_LONG, // 12: major faults
PROC_SPACE_TERM,
PROC_SPACE_TERM|PROC_OUT_LONG, // 14: utime
PROC_SPACE_TERM|PROC_OUT_LONG, // 15: stime
};
static final int PROCESS_STAT_MINOR_FAULTS = 0;
static final int PROCESS_STAT_MAJOR_FAULTS = 1;
static final int PROCESS_STAT_UTIME = 2;
static final int PROCESS_STAT_STIME = 3;
/** Stores user time and system time in jiffies. */
private final long[] mProcessStatsData = new long[4];
/** Stores user time and system time in jiffies. Used for
* public API to retrieve CPU use for a process. Must lock while in use. */
private final long[] mSinglePidStatsData = new long[4];
private static final int[] PROCESS_FULL_STATS_FORMAT = new int[] {
PROC_SPACE_TERM,
PROC_SPACE_TERM|PROC_PARENS|PROC_OUT_STRING, // 2: name
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM|PROC_OUT_LONG, // 10: minor faults
PROC_SPACE_TERM,
PROC_SPACE_TERM|PROC_OUT_LONG, // 12: major faults
PROC_SPACE_TERM,
PROC_SPACE_TERM|PROC_OUT_LONG, // 14: utime
PROC_SPACE_TERM|PROC_OUT_LONG, // 15: stime
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM,
PROC_SPACE_TERM|PROC_OUT_LONG, // 23: vsize
};
static final int PROCESS_FULL_STAT_MINOR_FAULTS = 1;
static final int PROCESS_FULL_STAT_MAJOR_FAULTS = 2;
static final int PROCESS_FULL_STAT_UTIME = 3;
static final int PROCESS_FULL_STAT_STIME = 4;
static final int PROCESS_FULL_STAT_VSIZE = 5;
private final String[] mProcessFullStatsStringData = new String[6];
private final long[] mProcessFullStatsData = new long[6];
private static final int[] SYSTEM_CPU_FORMAT = new int[] {
PROC_SPACE_TERM|PROC_COMBINE,
PROC_SPACE_TERM|PROC_OUT_LONG, // 1: user time
PROC_SPACE_TERM|PROC_OUT_LONG, // 2: nice time
PROC_SPACE_TERM|PROC_OUT_LONG, // 3: sys time
PROC_SPACE_TERM|PROC_OUT_LONG, // 4: idle time
PROC_SPACE_TERM|PROC_OUT_LONG, // 5: iowait time
PROC_SPACE_TERM|PROC_OUT_LONG, // 6: irq time
PROC_SPACE_TERM|PROC_OUT_LONG // 7: softirq time
};
private final long[] mSystemCpuData = new long[7];
private static final int[] LOAD_AVERAGE_FORMAT = new int[] {
PROC_SPACE_TERM|PROC_OUT_FLOAT, // 0: 1 min
PROC_SPACE_TERM|PROC_OUT_FLOAT, // 1: 5 mins
PROC_SPACE_TERM|PROC_OUT_FLOAT // 2: 15 mins
};
private final float[] mLoadAverageData = new float[3];
private final boolean mIncludeThreads;
// How long a CPU jiffy is in milliseconds.
private final long mJiffyMillis;
private float mLoad1 = 0;
private float mLoad5 = 0;
private float mLoad15 = 0;
// All times are in milliseconds. They are converted from jiffies to milliseconds
// when extracted from the kernel.
private long mCurrentSampleTime;
private long mLastSampleTime;
private long mCurrentSampleRealTime;
private long mLastSampleRealTime;
private long mCurrentSampleWallTime;
private long mLastSampleWallTime;
private long mBaseUserTime;
private long mBaseSystemTime;
private long mBaseIoWaitTime;
private long mBaseIrqTime;
private long mBaseSoftIrqTime;
private long mBaseIdleTime;
private int mRelUserTime;
private int mRelSystemTime;
private int mRelIoWaitTime;
private int mRelIrqTime;
private int mRelSoftIrqTime;
private int mRelIdleTime;
private boolean mRelStatsAreGood;
private int[] mCurPids;
private int[] mCurThreadPids;
private final ArrayList mProcStats = new ArrayList();
private final ArrayList mWorkingProcs = new ArrayList();
private boolean mWorkingProcsSorted;
private boolean mFirst = true;
public interface FilterStats {
/** Which stats to pick when filtering */
boolean needed(Stats stats);
}
public static class Stats {
public final int pid;
public final int uid;
final String statFile;
final String cmdlineFile;
final String threadsDir;
final ArrayList threadStats;
final ArrayList workingThreads;
public BatteryStatsImpl.Uid.Proc batteryStats;
public boolean interesting;
public String baseName;
@UnsupportedAppUsage
public String name;
public int nameWidth;
// vsize capture when process first detected; can be used to
// filter out kernel processes.
public long vsize;
/**
* Time in milliseconds.
*/
public long base_uptime;
/**
* Time in milliseconds.
*/
@UnsupportedAppUsage
public long rel_uptime;
/**
* Time in milliseconds.
*/
public long base_utime;
/**
* Time in milliseconds.
*/
public long base_stime;
/**
* Time in milliseconds.
*/
@UnsupportedAppUsage
public int rel_utime;
/**
* Time in milliseconds.
*/
@UnsupportedAppUsage
public int rel_stime;
public long base_minfaults;
public long base_majfaults;
public int rel_minfaults;
public int rel_majfaults;
public boolean active;
public boolean working;
public boolean added;
public boolean removed;
Stats(int _pid, int parentPid, boolean includeThreads) {
pid = _pid;
if (parentPid < 0) {
final File procDir = new File("/proc", Integer.toString(pid));
uid = getUid(procDir.toString());
statFile = new File(procDir, "stat").toString();
cmdlineFile = new File(procDir, "cmdline").toString();
threadsDir = (new File(procDir, "task")).toString();
if (includeThreads) {
threadStats = new ArrayList();
workingThreads = new ArrayList();
} else {
threadStats = null;
workingThreads = null;
}
} else {
final File procDir = new File("/proc", Integer.toString(
parentPid));
final File taskDir = new File(
new File(procDir, "task"), Integer.toString(pid));
uid = getUid(taskDir.toString());
statFile = new File(taskDir, "stat").toString();
cmdlineFile = null;
threadsDir = null;
threadStats = null;
workingThreads = null;
}
}
private static int getUid(String path) {
try {
return Os.stat(path).st_uid;
} catch (ErrnoException e) {
Slog.w(TAG, "Failed to stat(" + path + "): " + e);
return -1;
}
}
}
private final static Comparator sLoadComparator = new Comparator() {
public final int
compare(Stats sta, Stats stb) {
int ta = sta.rel_utime + sta.rel_stime;
int tb = stb.rel_utime + stb.rel_stime;
if (ta != tb) {
return ta > tb ? -1 : 1;
}
if (sta.added != stb.added) {
return sta.added ? -1 : 1;
}
if (sta.removed != stb.removed) {
return sta.added ? -1 : 1;
}
return 0;
}
};
@UnsupportedAppUsage
public ProcessCpuTracker(boolean includeThreads) {
mIncludeThreads = includeThreads;
long jiffyHz = Os.sysconf(OsConstants._SC_CLK_TCK);
mJiffyMillis = 1000/jiffyHz;
}
public void onLoadChanged(float load1, float load5, float load15) {
}
public int onMeasureProcessName(String name) {
return 0;
}
public void init() {
if (DEBUG) Slog.v(TAG, "Init: " + this);
mFirst = true;
update();
}
@UnsupportedAppUsage
public void update() {
if (DEBUG) Slog.v(TAG, "Update: " + this);
final long nowUptime = SystemClock.uptimeMillis();
final long nowRealtime = SystemClock.elapsedRealtime();
final long nowWallTime = System.currentTimeMillis();
final long[] sysCpu = mSystemCpuData;
if (Process.readProcFile("/proc/stat", SYSTEM_CPU_FORMAT,
null, sysCpu, null)) {
// Total user time is user + nice time.
final long usertime = (sysCpu[0]+sysCpu[1]) * mJiffyMillis;
// Total system time is simply system time.
final long systemtime = sysCpu[2] * mJiffyMillis;
// Total idle time is simply idle time.
final long idletime = sysCpu[3] * mJiffyMillis;
// Total irq time is iowait + irq + softirq time.
final long iowaittime = sysCpu[4] * mJiffyMillis;
final long irqtime = sysCpu[5] * mJiffyMillis;
final long softirqtime = sysCpu[6] * mJiffyMillis;
// This code is trying to avoid issues with idle time going backwards,
// but currently it gets into situations where it triggers most of the time. :(
if (true || (usertime >= mBaseUserTime && systemtime >= mBaseSystemTime
&& iowaittime >= mBaseIoWaitTime && irqtime >= mBaseIrqTime
&& softirqtime >= mBaseSoftIrqTime && idletime >= mBaseIdleTime)) {
mRelUserTime = (int)(usertime - mBaseUserTime);
mRelSystemTime = (int)(systemtime - mBaseSystemTime);
mRelIoWaitTime = (int)(iowaittime - mBaseIoWaitTime);
mRelIrqTime = (int)(irqtime - mBaseIrqTime);
mRelSoftIrqTime = (int)(softirqtime - mBaseSoftIrqTime);
mRelIdleTime = (int)(idletime - mBaseIdleTime);
mRelStatsAreGood = true;
if (DEBUG) {
Slog.i("Load", "Total U:" + (sysCpu[0]*mJiffyMillis)
+ " N:" + (sysCpu[1]*mJiffyMillis)
+ " S:" + (sysCpu[2]*mJiffyMillis) + " I:" + (sysCpu[3]*mJiffyMillis)
+ " W:" + (sysCpu[4]*mJiffyMillis) + " Q:" + (sysCpu[5]*mJiffyMillis)
+ " O:" + (sysCpu[6]*mJiffyMillis));
Slog.i("Load", "Rel U:" + mRelUserTime + " S:" + mRelSystemTime
+ " I:" + mRelIdleTime + " Q:" + mRelIrqTime);
}
mBaseUserTime = usertime;
mBaseSystemTime = systemtime;
mBaseIoWaitTime = iowaittime;
mBaseIrqTime = irqtime;
mBaseSoftIrqTime = softirqtime;
mBaseIdleTime = idletime;
} else {
mRelUserTime = 0;
mRelSystemTime = 0;
mRelIoWaitTime = 0;
mRelIrqTime = 0;
mRelSoftIrqTime = 0;
mRelIdleTime = 0;
mRelStatsAreGood = false;
Slog.w(TAG, "/proc/stats has gone backwards; skipping CPU update");
return;
}
}
mLastSampleTime = mCurrentSampleTime;
mCurrentSampleTime = nowUptime;
mLastSampleRealTime = mCurrentSampleRealTime;
mCurrentSampleRealTime = nowRealtime;
mLastSampleWallTime = mCurrentSampleWallTime;
mCurrentSampleWallTime = nowWallTime;
final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads();
try {
mCurPids = collectStats("/proc", -1, mFirst, mCurPids, mProcStats);
} finally {
StrictMode.setThreadPolicy(savedPolicy);
}
final float[] loadAverages = mLoadAverageData;
if (Process.readProcFile("/proc/loadavg", LOAD_AVERAGE_FORMAT,
null, null, loadAverages)) {
float load1 = loadAverages[0];
float load5 = loadAverages[1];
float load15 = loadAverages[2];
if (load1 != mLoad1 || load5 != mLoad5 || load15 != mLoad15) {
mLoad1 = load1;
mLoad5 = load5;
mLoad15 = load15;
onLoadChanged(load1, load5, load15);
}
}
if (DEBUG) Slog.i(TAG, "*** TIME TO COLLECT STATS: "
+ (SystemClock.uptimeMillis()-mCurrentSampleTime));
mWorkingProcsSorted = false;
mFirst = false;
}
private int[] collectStats(String statsFile, int parentPid, boolean first,
int[] curPids, ArrayList allProcs) {
int[] pids = Process.getPids(statsFile, curPids);
int NP = (pids == null) ? 0 : pids.length;
int NS = allProcs.size();
int curStatsIndex = 0;
for (int i=0; i pid) {
// We have a new process!
st = new Stats(pid, parentPid, mIncludeThreads);
allProcs.add(curStatsIndex, st);
curStatsIndex++;
NS++;
if (DEBUG) Slog.v(TAG, "New "
+ (parentPid < 0 ? "process" : "thread")
+ " pid " + pid + ": " + st);
final String[] procStatsString = mProcessFullStatsStringData;
final long[] procStats = mProcessFullStatsData;
st.base_uptime = SystemClock.uptimeMillis();
String path = st.statFile.toString();
//Slog.d(TAG, "Reading proc file: " + path);
if (Process.readProcFile(path, PROCESS_FULL_STATS_FORMAT, procStatsString,
procStats, null)) {
// This is a possible way to filter out processes that
// are actually kernel threads... do we want to? Some
// of them do use CPU, but there can be a *lot* that are
// not doing anything.
st.vsize = procStats[PROCESS_FULL_STAT_VSIZE];
if (true || procStats[PROCESS_FULL_STAT_VSIZE] != 0) {
st.interesting = true;
st.baseName = procStatsString[0];
st.base_minfaults = procStats[PROCESS_FULL_STAT_MINOR_FAULTS];
st.base_majfaults = procStats[PROCESS_FULL_STAT_MAJOR_FAULTS];
st.base_utime = procStats[PROCESS_FULL_STAT_UTIME] * mJiffyMillis;
st.base_stime = procStats[PROCESS_FULL_STAT_STIME] * mJiffyMillis;
} else {
Slog.i(TAG, "Skipping kernel process pid " + pid
+ " name " + procStatsString[0]);
st.baseName = procStatsString[0];
}
} else {
Slog.w(TAG, "Skipping unknown process pid " + pid);
st.baseName = "";
st.base_utime = st.base_stime = 0;
st.base_minfaults = st.base_majfaults = 0;
}
if (parentPid < 0) {
getName(st, st.cmdlineFile);
if (st.threadStats != null) {
mCurThreadPids = collectStats(st.threadsDir, pid, true,
mCurThreadPids, st.threadStats);
}
} else if (st.interesting) {
st.name = st.baseName;
st.nameWidth = onMeasureProcessName(st.name);
}
if (DEBUG) Slog.v("Load", "Stats added " + st.name + " pid=" + st.pid
+ " utime=" + st.base_utime + " stime=" + st.base_stime
+ " minfaults=" + st.base_minfaults + " majfaults=" + st.base_majfaults);
st.rel_utime = 0;
st.rel_stime = 0;
st.rel_minfaults = 0;
st.rel_majfaults = 0;
st.added = true;
if (!first && st.interesting) {
st.working = true;
}
continue;
}
// This process has gone away!
st.rel_utime = 0;
st.rel_stime = 0;
st.rel_minfaults = 0;
st.rel_majfaults = 0;
st.removed = true;
st.working = true;
allProcs.remove(curStatsIndex);
NS--;
if (DEBUG) Slog.v(TAG, "Removed "
+ (parentPid < 0 ? "process" : "thread")
+ " pid " + pid + ": " + st);
// Decrement the loop counter so that we process the current pid
// again the next time through the loop.
i--;
continue;
}
while (curStatsIndex < NS) {
// This process has gone away!
final Stats st = allProcs.get(curStatsIndex);
st.rel_utime = 0;
st.rel_stime = 0;
st.rel_minfaults = 0;
st.rel_majfaults = 0;
st.removed = true;
st.working = true;
allProcs.remove(curStatsIndex);
NS--;
if (localLOGV) Slog.v(TAG, "Removed pid " + st.pid + ": " + st);
}
return pids;
}
/**
* Returns the total time (in milliseconds) spent executing in
* both user and system code. Safe to call without lock held.
*/
public long getCpuTimeForPid(int pid) {
synchronized (mSinglePidStatsData) {
final String statFile = "/proc/" + pid + "/stat";
final long[] statsData = mSinglePidStatsData;
if (Process.readProcFile(statFile, PROCESS_STATS_FORMAT,
null, statsData, null)) {
long time = statsData[PROCESS_STAT_UTIME]
+ statsData[PROCESS_STAT_STIME];
return time * mJiffyMillis;
}
return 0;
}
}
/**
* @return time in milliseconds.
*/
final public int getLastUserTime() {
return mRelUserTime;
}
/**
* @return time in milliseconds.
*/
final public int getLastSystemTime() {
return mRelSystemTime;
}
/**
* @return time in milliseconds.
*/
final public int getLastIoWaitTime() {
return mRelIoWaitTime;
}
/**
* @return time in milliseconds.
*/
final public int getLastIrqTime() {
return mRelIrqTime;
}
/**
* @return time in milliseconds.
*/
final public int getLastSoftIrqTime() {
return mRelSoftIrqTime;
}
/**
* @return time in milliseconds.
*/
final public int getLastIdleTime() {
return mRelIdleTime;
}
final public boolean hasGoodLastStats() {
return mRelStatsAreGood;
}
final public float getTotalCpuPercent() {
int denom = mRelUserTime+mRelSystemTime+mRelIrqTime+mRelIdleTime;
if (denom <= 0) {
return 0;
}
return ((float)(mRelUserTime+mRelSystemTime+mRelIrqTime)*100) / denom;
}
final void buildWorkingProcs() {
if (!mWorkingProcsSorted) {
mWorkingProcs.clear();
final int N = mProcStats.size();
for (int i=0; i 1) {
stats.workingThreads.clear();
final int M = stats.threadStats.size();
for (int j=0; j getStats(FilterStats filter) {
final ArrayList statses = new ArrayList<>(mProcStats.size());
final int N = mProcStats.size();
for (int p = 0; p < N; p++) {
Stats stats = mProcStats.get(p);
if (filter.needed(stats)) {
statses.add(stats);
}
}
return statses;
}
@UnsupportedAppUsage
final public int countWorkingStats() {
buildWorkingProcs();
return mWorkingProcs.size();
}
@UnsupportedAppUsage
final public Stats getWorkingStats(int index) {
return mWorkingProcs.get(index);
}
final public String printCurrentLoad() {
StringWriter sw = new StringWriter();
PrintWriter pw = new FastPrintWriter(sw, false, 128);
pw.print("Load: ");
pw.print(mLoad1);
pw.print(" / ");
pw.print(mLoad5);
pw.print(" / ");
pw.println(mLoad15);
pw.flush();
return sw.toString();
}
final public String printCurrentState(long now) {
final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
buildWorkingProcs();
StringWriter sw = new StringWriter();
PrintWriter pw = new FastPrintWriter(sw, false, 1024);
pw.print("CPU usage from ");
if (now > mLastSampleTime) {
pw.print(now-mLastSampleTime);
pw.print("ms to ");
pw.print(now-mCurrentSampleTime);
pw.print("ms ago");
} else {
pw.print(mLastSampleTime-now);
pw.print("ms to ");
pw.print(mCurrentSampleTime-now);
pw.print("ms later");
}
pw.print(" (");
pw.print(sdf.format(new Date(mLastSampleWallTime)));
pw.print(" to ");
pw.print(sdf.format(new Date(mCurrentSampleWallTime)));
pw.print(")");
long sampleTime = mCurrentSampleTime - mLastSampleTime;
long sampleRealTime = mCurrentSampleRealTime - mLastSampleRealTime;
long percAwake = sampleRealTime > 0 ? ((sampleTime*100) / sampleRealTime) : 0;
if (percAwake != 100) {
pw.print(" with ");
pw.print(percAwake);
pw.print("% awake");
}
pw.println(":");
final int totalTime = mRelUserTime + mRelSystemTime + mRelIoWaitTime
+ mRelIrqTime + mRelSoftIrqTime + mRelIdleTime;
if (DEBUG) Slog.i(TAG, "totalTime " + totalTime + " over sample time "
+ (mCurrentSampleTime-mLastSampleTime));
int N = mWorkingProcs.size();
for (int i=0; i= 0) {
pw.print(pid);
pw.print("/");
}
pw.print(label);
pw.print(": ");
printRatio(pw, user, totalTime);
pw.print("% user + ");
printRatio(pw, system, totalTime);
pw.print("% kernel");
if (iowait > 0) {
pw.print(" + ");
printRatio(pw, iowait, totalTime);
pw.print("% iowait");
}
if (irq > 0) {
pw.print(" + ");
printRatio(pw, irq, totalTime);
pw.print("% irq");
}
if (softIrq > 0) {
pw.print(" + ");
printRatio(pw, softIrq, totalTime);
pw.print("% softirq");
}
if (minFaults > 0 || majFaults > 0) {
pw.print(" / faults:");
if (minFaults > 0) {
pw.print(" ");
pw.print(minFaults);
pw.print(" minor");
}
if (majFaults > 0) {
pw.print(" ");
pw.print(majFaults);
pw.print(" major");
}
}
pw.println();
}
private void getName(Stats st, String cmdlineFile) {
String newName = st.name;
if (st.name == null || st.name.equals("app_process")
|| st.name.equals("")) {
String cmdName = ProcStatsUtil.readTerminatedProcFile(cmdlineFile, (byte) '\0');
if (cmdName != null && cmdName.length() > 1) {
newName = cmdName;
int i = newName.lastIndexOf("/");
if (i > 0 && i < newName.length()-1) {
newName = newName.substring(i+1);
}
}
if (newName == null) {
newName = st.baseName;
}
}
if (st.name == null || !newName.equals(st.name)) {
st.name = newName;
st.nameWidth = onMeasureProcessName(st.name);
}
}
}
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