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Fix for NetworkStats/Telephony deadlock

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Call into NetworkStatsService to update uid foreground
state without the NPMS lock held. Both calls are from
the handler thread, so no sequencing issues.

Bug: 123274986
Bug: 74007921
Test: atest CtsHostsideNetworkTests
Change-Id: I9e8449e5a75db616e646f55c930ff82982fc9083
This commit is contained in:
Amith Yamasani
2019-02-19 09:57:32 -08:00
parent dd07ae579c
commit d78542bb52
1 changed files with 21 additions and 8 deletions
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29
services/core/java/com/android/server/net/NetworkPolicyManagerService.java
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@ -3515,10 +3515,10 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
/**
* Process state of UID changed; if needed, will trigger
* {@link #updateRulesForDataUsageRestrictionsUL(int)} and
* {@link #updateRulesForPowerRestrictionsUL(int)}
* {@link #updateRulesForPowerRestrictionsUL(int)}. Returns true if the state was updated.
*/
@GuardedBy("mUidRulesFirstLock")
private void updateUidStateUL(int uid, int uidState) {
private boolean updateUidStateUL(int uid, int uidState) {
Trace.traceBegin(Trace.TRACE_TAG_NETWORK, "updateUidStateUL");
try {
final int oldUidState = mUidState.get(uid, ActivityManager.PROCESS_STATE_CACHED_EMPTY);
@ -3537,15 +3537,16 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
}
updateRulesForPowerRestrictionsUL(uid);
}
updateNetworkStats(uid, isUidStateForeground(uidState));
return true;
}
} finally {
Trace.traceEnd(Trace.TRACE_TAG_NETWORK);
}
return false;
}
@GuardedBy("mUidRulesFirstLock")
private void removeUidStateUL(int uid) {
private boolean removeUidStateUL(int uid) {
final int index = mUidState.indexOfKey(uid);
if (index >= 0) {
final int oldUidState = mUidState.valueAt(index);
@ -3560,9 +3561,10 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
updateRuleForRestrictPowerUL(uid);
}
updateRulesForPowerRestrictionsUL(uid);
updateNetworkStats(uid, false);
return true;
}
}
return false;
}
// adjust stats accounting based on foreground status
@ -4552,21 +4554,26 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
}
}
}
};
void handleUidChanged(int uid, int procState, long procStateSeq) {
Trace.traceBegin(Trace.TRACE_TAG_NETWORK, "onUidStateChanged");
try {
boolean updated;
synchronized (mUidRulesFirstLock) {
// We received a uid state change callback, add it to the history so that it
// will be useful for debugging.
mLogger.uidStateChanged(uid, procState, procStateSeq);
// Now update the network policy rules as per the updated uid state.
updateUidStateUL(uid, procState);
updated = updateUidStateUL(uid, procState);
// Updating the network rules is done, so notify AMS about this.
mActivityManagerInternal.notifyNetworkPolicyRulesUpdated(uid, procStateSeq);
}
// Do this without the lock held. handleUidChanged() and handleUidGone() are
// called from the handler, so there's no multi-threading issue.
if (updated) {
updateNetworkStats(uid, isUidStateForeground(procState));
}
} finally {
Trace.traceEnd(Trace.TRACE_TAG_NETWORK);
}
@ -4575,8 +4582,14 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
void handleUidGone(int uid) {
Trace.traceBegin(Trace.TRACE_TAG_NETWORK, "onUidGone");
try {
boolean updated;
synchronized (mUidRulesFirstLock) {
removeUidStateUL(uid);
updated = removeUidStateUL(uid);
}
// Do this without the lock held. handleUidChanged() and handleUidGone() are
// called from the handler, so there's no multi-threading issue.
if (updated) {
updateNetworkStats(uid, false);
}
} finally {
Trace.traceEnd(Trace.TRACE_TAG_NETWORK);