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Merge "Fix thread priority after boosting." into nyc-dev-plus-aosp

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Alan Leung
2016-07-27 06:01:46 +00:00
committed by Android (Google) Code Review
parent 9efcf16b8d 402aee85a3
commit ab11a7dd1c
1 changed files with 25 additions and 14 deletions
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39
services/core/java/com/android/server/am/ActivityManagerService.java
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@@ -640,30 +640,41 @@ public final class ActivityManagerService extends ActivityManagerNative
return mShowDialogs && !mSleeping && !mShuttingDown;
}
// it's a semaphore; boost when 0->1, reset when 1->0
static ThreadLocal<Integer> sIsBoosted = new ThreadLocal<Integer>() {
@Override protected Integer initialValue() {
return 0;
private static final class PriorityState {
// Acts as counter for number of synchronized region that needs to acquire 'this' as a lock
// the current thread is currently in. When it drops down to zero, we will no longer boost
// the thread's priority.
private int regionCounter = 0;
// The thread's previous priority before boosting.
private int prevPriority = Integer.MIN_VALUE;
}
static ThreadLocal<PriorityState> sThreadPriorityState = new ThreadLocal<PriorityState>() {
@Override protected PriorityState initialValue() {
return new PriorityState();
}
};
static void boostPriorityForLockedSection() {
if (sIsBoosted.get() == 0) {
// boost to prio 118 while holding a global lock
Process.setThreadPriority(Process.myTid(), -2);
//Log.e(TAG, "PRIORITY BOOST: set priority on TID " + Process.myTid());
int tid = Process.myTid();
int prevPriority = Process.getThreadPriority(tid);
PriorityState state = sThreadPriorityState.get();
if (state.regionCounter == 0 && prevPriority > -2) {
state.prevPriority = prevPriority;
Process.setThreadPriority(tid, -2);
}
int cur = sIsBoosted.get();
sIsBoosted.set(cur + 1);
state.regionCounter++;
}
static void resetPriorityAfterLockedSection() {
sIsBoosted.set(sIsBoosted.get() - 1);
if (sIsBoosted.get() == 0) {
//Log.e(TAG, "PRIORITY BOOST: reset priority on TID " + Process.myTid());
Process.setThreadPriority(Process.myTid(), 0);
PriorityState state = sThreadPriorityState.get();
state.regionCounter--;
if (state.regionCounter == 0 && state.prevPriority > -2) {
Process.setThreadPriority(Process.myTid(), state.prevPriority);
}
}
public class PendingAssistExtras extends Binder implements Runnable {
public final ActivityRecord activity;
public final Bundle extras;