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Sample atomic network stats buckets, full poll.

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When sampling network stats, always use atomic buckets instead of
interpolating.  Always poll iface and UID together so we distribute
into buckets equally.  Move stale bucket trimming to just before
writing stats.

Bug: 5321340
Change-Id: I78a2226778a79c875f3668336e39ea24a7b4d5c4
This commit is contained in:
Jeff Sharkey
2011-09-18 13:30:23 -07:00
parent ffa6efd8e0
commit 8d8ecaef37
2 changed files with 79 additions and 104 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
core/java/android/net/NetworkStatsHistory.java
View File

@@ -441,10 +441,10 @@ public class NetworkStatsHistory implements Parcelable {
final long curStart = bucketStart[i];
final long curEnd = curStart + bucketDuration;
// bucket is older than record; we're finished
if (curEnd < start) break;
// bucket is newer than record; keep looking
if (curStart > end) continue;
// bucket is older than request; we're finished
if (curEnd <= start) break;
// bucket is newer than request; keep looking
if (curStart >= end) continue;
// include full value for active buckets, otherwise only fractional
final boolean activeBucket = curStart < now && curEnd > now;
@@ -466,7 +466,6 @@ public class NetworkStatsHistory implements Parcelable {
if (txPackets != null) entry.txPackets += txPackets[i] * overlap / bucketDuration;
if (operations != null) entry.operations += operations[i] * overlap / bucketDuration;
}
return entry;
}

136
services/java/com/android/server/net/NetworkStatsService.java
View File

@@ -36,7 +36,6 @@ import static android.net.NetworkTemplate.buildTemplateMobileAll;
import static android.net.NetworkTemplate.buildTemplateWifi;
import static android.net.TrafficStats.UID_REMOVED;
import static android.net.TrafficStats.UID_TETHERING;
import static android.provider.Settings.Secure.NETSTATS_FORCE_COMPLETE_POLL;
import static android.provider.Settings.Secure.NETSTATS_NETWORK_BUCKET_DURATION;
import static android.provider.Settings.Secure.NETSTATS_NETWORK_MAX_HISTORY;
import static android.provider.Settings.Secure.NETSTATS_PERSIST_THRESHOLD;
@@ -136,15 +135,10 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
private static final int MSG_PERFORM_POLL = 0x1;
/** Flags to control detail level of poll event. */
private static final int FLAG_POLL_NETWORK = 0x1;
private static final int FLAG_POLL_UID = 0x2;
private static final int FLAG_POLL_TETHER = 0x3;
private static final int FLAG_PERSIST_NETWORK = 0x10;
private static final int FLAG_PERSIST_UID = 0x20;
private static final int FLAG_FORCE_PERSIST = 0x100;
private static final int FLAG_POLL_ALL = FLAG_POLL_NETWORK | FLAG_POLL_UID | FLAG_POLL_TETHER;
private static final int FLAG_PERSIST_ALL = FLAG_PERSIST_NETWORK | FLAG_PERSIST_UID;
private static final int FLAG_PERSIST_FORCE = 0x100;
private final Context mContext;
private final INetworkManagementService mNetworkManager;
@@ -182,7 +176,6 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
public long getUidMaxHistory();
public long getTagMaxHistory();
public long getTimeCacheMaxAge();
public boolean getForceCompletePoll();
}
private final Object mStatsLock = new Object();
@@ -529,7 +522,7 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
@Override
public void forceUpdate() {
mContext.enforceCallingOrSelfPermission(READ_NETWORK_USAGE_HISTORY, TAG);
performPoll(FLAG_POLL_ALL | FLAG_PERSIST_ALL);
performPoll(FLAG_PERSIST_ALL);
}
/**
@@ -561,7 +554,7 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
public void onReceive(Context context, Intent intent) {
// on background handler thread, and verified CONNECTIVITY_INTERNAL
// permission above.
performPoll(FLAG_POLL_TETHER);
performPoll(FLAG_PERSIST_NETWORK);
}
};
@@ -570,7 +563,7 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
public void onReceive(Context context, Intent intent) {
// on background handler thread, and verified UPDATE_DEVICE_STATS
// permission above.
performPoll(FLAG_POLL_ALL | FLAG_PERSIST_ALL);
performPoll(FLAG_PERSIST_ALL);
// verify that we're watching global alert
registerGlobalAlert();
@@ -617,7 +610,7 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
if (LIMIT_GLOBAL_ALERT.equals(limitName)) {
// kick off background poll to collect network stats; UID stats
// are handled during normal polling interval.
final int flags = FLAG_POLL_NETWORK | FLAG_PERSIST_NETWORK;
final int flags = FLAG_PERSIST_NETWORK;
mHandler.obtainMessage(MSG_PERFORM_POLL, flags, 0).sendToTarget();
// re-arm global alert for next update
@@ -639,10 +632,9 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
// isn't perfect, since the kernel may already be counting traffic from
// the updated network.
// poll both network and UID stats, but only persist network stats,
// since this codepath should stay fast. UID stats will be persisted
// during next alarm poll event.
performPollLocked(FLAG_POLL_ALL | FLAG_PERSIST_NETWORK);
// poll, but only persist network stats to keep codepath fast. UID stats
// will be persisted during next alarm poll event.
performPollLocked(FLAG_PERSIST_NETWORK);
final NetworkState[] states;
try {
@@ -706,21 +698,9 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
if (LOGV) Slog.v(TAG, "performPollLocked(flags=0x" + Integer.toHexString(flags) + ")");
final long startRealtime = SystemClock.elapsedRealtime();
boolean pollNetwork = (flags & FLAG_POLL_NETWORK) != 0;
boolean pollUid = (flags & FLAG_POLL_UID) != 0;
boolean pollTether = (flags & FLAG_POLL_TETHER) != 0;
// when complete poll requested, any partial poll enables everything
final boolean forceCompletePoll = mSettings.getForceCompletePoll();
if (forceCompletePoll && (pollNetwork || pollUid || pollTether)) {
pollNetwork = true;
pollUid = true;
pollTether = true;
}
final boolean persistNetwork = (flags & FLAG_PERSIST_NETWORK) != 0;
final boolean persistUid = (flags & FLAG_PERSIST_UID) != 0;
final boolean forcePersist = (flags & FLAG_FORCE_PERSIST) != 0;
final boolean persistForce = (flags & FLAG_PERSIST_FORCE) != 0;
// try refreshing time source when stale
if (mTime.getCacheAge() > mSettings.getTimeCacheMaxAge()) {
@@ -733,42 +713,37 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
final long threshold = mSettings.getPersistThreshold();
try {
if (pollNetwork) {
// record network stats
final NetworkStats networkSnapshot = mNetworkManager.getNetworkStatsSummary();
performNetworkPollLocked(networkSnapshot, currentTime);
// persist when enough network data has occurred
final NetworkStats persistNetworkDelta = computeStatsDelta(
mLastPersistNetworkSnapshot, networkSnapshot, true);
final boolean pastThreshold = persistNetworkDelta.getTotalBytes() > threshold;
if (forcePersist || (persistNetwork && pastThreshold)) {
final boolean networkPastThreshold = persistNetworkDelta.getTotalBytes() > threshold;
if (persistForce || (persistNetwork && networkPastThreshold)) {
writeNetworkStatsLocked();
mLastPersistNetworkSnapshot = networkSnapshot;
}
}
if (pollTether) {
// record tethering stats; persisted during normal UID cycle below
final String[] ifacePairs = mConnManager.getTetheredIfacePairs();
final NetworkStats tetherSnapshot = mNetworkManager.getNetworkStatsTethering(
ifacePairs);
performTetherPollLocked(tetherSnapshot, currentTime);
// persisted during normal UID cycle below
}
if (pollUid) {
// record uid stats
final NetworkStats uidSnapshot = mNetworkManager.getNetworkStatsUidDetail(UID_ALL);
performUidPollLocked(uidSnapshot, currentTime);
// persist when enough network data has occurred
final NetworkStats persistUidDelta = computeStatsDelta(
mLastPersistUidSnapshot, uidSnapshot, true);
final boolean pastThreshold = persistUidDelta.getTotalBytes() > threshold;
if (forcePersist || (persistUid && pastThreshold)) {
final boolean uidPastThreshold = persistUidDelta.getTotalBytes() > threshold;
if (persistForce || (persistUid && uidPastThreshold)) {
writeUidStatsLocked();
mLastPersistUidSnapshot = uidSnapshot;
}
}
} catch (IllegalStateException e) {
Log.wtf(TAG, "problem reading network stats", e);
} catch (RemoteException e) {
@@ -781,9 +756,7 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
}
// sample stats after each full poll
if (pollNetwork && pollUid) {
performSample();
}
// finally, dispatch updated event to any listeners
final Intent updatedIntent = new Intent(ACTION_NETWORK_STATS_UPDATED);
@@ -813,12 +786,6 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
history.recordData(timeStart, currentTime, entry);
}
// trim any history beyond max
final long maxHistory = mSettings.getNetworkMaxHistory();
for (NetworkStatsHistory history : mNetworkStats.values()) {
history.removeBucketsBefore(currentTime - maxHistory);
}
mLastPollNetworkSnapshot = networkSnapshot;
if (LOGD && unknownIface.size() > 0) {
@@ -862,20 +829,6 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
history.recordData(timeStart, currentTime, entry);
}
// trim any history beyond max
final long maxUidHistory = mSettings.getUidMaxHistory();
final long maxTagHistory = mSettings.getTagMaxHistory();
for (UidStatsKey key : mUidStats.keySet()) {
final NetworkStatsHistory history = mUidStats.get(key);
// detailed tags are trimmed sooner than summary in TAG_NONE
if (key.tag == TAG_NONE) {
history.removeBucketsBefore(currentTime - maxUidHistory);
} else {
history.removeBucketsBefore(currentTime - maxTagHistory);
}
}
mLastPollUidSnapshot = uidSnapshot;
mLastPollOperationsSnapshot = mOperations;
mOperations = new NetworkStats(0L, 10);
@@ -917,9 +870,13 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
* Sample recent statistics summary into {@link EventLog}.
*/
private void performSample() {
// take sample as total over last 4 hours
final long end = mTime.hasCache() ? mTime.currentTimeMillis() : System.currentTimeMillis();
final long start = end - (4 * HOUR_IN_MILLIS);
final long largestBucketSize = Math.max(
mSettings.getNetworkBucketDuration(), mSettings.getUidBucketDuration());
// take sample as atomic buckets
final long now = mTime.hasCache() ? mTime.currentTimeMillis() : System.currentTimeMillis();
final long end = now - (now % largestBucketSize) + largestBucketSize;
final long start = end - largestBucketSize;
NetworkTemplate template = null;
NetworkStats.Entry ifaceTotal = null;
@@ -929,21 +886,17 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
template = buildTemplateMobileAll(getActiveSubscriberId(mContext));
ifaceTotal = getSummaryForNetwork(template, start, end).getTotal(ifaceTotal);
uidTotal = getSummaryForAllUid(template, start, end, false).getTotal(uidTotal);
EventLogTags.writeNetstatsMobileSample(
ifaceTotal.rxBytes, ifaceTotal.txBytes,
ifaceTotal.rxPackets, ifaceTotal.txPackets,
uidTotal.rxBytes, uidTotal.txBytes,
uidTotal.rxPackets, uidTotal.txPackets);
EventLogTags.writeNetstatsMobileSample(ifaceTotal.rxBytes, ifaceTotal.rxPackets,
ifaceTotal.txBytes, ifaceTotal.txPackets, uidTotal.rxBytes, uidTotal.rxPackets,
uidTotal.txBytes, uidTotal.rxPackets);
// collect wifi sample
template = buildTemplateWifi();
ifaceTotal = getSummaryForNetwork(template, start, end).getTotal(ifaceTotal);
uidTotal = getSummaryForAllUid(template, start, end, false).getTotal(uidTotal);
EventLogTags.writeNetstatsWifiSample(
ifaceTotal.rxBytes, ifaceTotal.txBytes,
ifaceTotal.rxPackets, ifaceTotal.txPackets,
uidTotal.rxBytes, uidTotal.txBytes,
uidTotal.rxPackets, uidTotal.txPackets);
EventLogTags.writeNetstatsWifiSample(ifaceTotal.rxBytes, ifaceTotal.rxPackets,
ifaceTotal.txBytes, ifaceTotal.txPackets, uidTotal.rxBytes, uidTotal.rxPackets,
uidTotal.txBytes, uidTotal.rxPackets);
}
/**
@@ -1143,6 +1096,15 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
// TODO: consider duplicating stats and releasing lock while writing
// trim any history beyond max
if (mTime.hasCache()) {
final long currentTime = mTime.currentTimeMillis();
final long maxHistory = mSettings.getNetworkMaxHistory();
for (NetworkStatsHistory history : mNetworkStats.values()) {
history.removeBucketsBefore(currentTime - maxHistory);
}
}
FileOutputStream fos = null;
try {
fos = mNetworkFile.startWrite();
@@ -1178,6 +1140,23 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
// TODO: consider duplicating stats and releasing lock while writing
// trim any history beyond max
if (mTime.hasCache()) {
final long currentTime = mTime.currentTimeMillis();
final long maxUidHistory = mSettings.getUidMaxHistory();
final long maxTagHistory = mSettings.getTagMaxHistory();
for (UidStatsKey key : mUidStats.keySet()) {
final NetworkStatsHistory history = mUidStats.get(key);
// detailed tags are trimmed sooner than summary in TAG_NONE
if (key.tag == TAG_NONE) {
history.removeBucketsBefore(currentTime - maxUidHistory);
} else {
history.removeBucketsBefore(currentTime - maxTagHistory);
}
}
}
// build UidStatsKey lists grouped by ident
final HashMap<NetworkIdentitySet, ArrayList<UidStatsKey>> keysByIdent = Maps.newHashMap();
for (UidStatsKey key : mUidStats.keySet()) {
@@ -1242,7 +1221,7 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
}
if (argSet.contains("poll")) {
performPollLocked(FLAG_POLL_ALL | FLAG_PERSIST_ALL | FLAG_FORCE_PERSIST);
performPollLocked(FLAG_PERSIST_ALL | FLAG_PERSIST_FORCE);
pw.println("Forced poll");
return;
}
@@ -1470,8 +1449,5 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
public long getTimeCacheMaxAge() {
return DAY_IN_MILLIS;
}
public boolean getForceCompletePoll() {
return getSecureBoolean(NETSTATS_FORCE_COMPLETE_POLL, false);
}
}
}