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surfaceflinger: Use only one EventThread when phase offsets are same.

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SurfaceFlinger uses two event-threads to support phase-offsets
for application and SurfaceFlinger itself. Extra thread may
cause scheduling issues and wake-up latency for either
SurfaceFlinger or Application, depending on scheduling, even
when running at higher priority as these threads have low-load
and qualify for task-packing.

Use single event-thread when phase offsets are same.

Debug runtime service call behavior change when same phase-offset:
1018 (set phase offset for Application): will change both
Application and SurfaceFlinger phase offsets.
1019 (set phase offset for SurfaceFlinger): Will be a no-op.

Change-Id: I2514b4ff6249e9bce3eb19f60b1dfe0de12b86d9
This commit is contained in:
Omprakash Dhyade 2016-02-05 14:54:08 -08:00 committed by Steve Kondik
parent b0cda680c2
commit 9e3751980f
1 changed files with 18 additions and 9 deletions
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9
services/surfaceflinger/SurfaceFlinger.cpp
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@ -453,6 +453,7 @@ void SurfaceFlinger::init() {
eglInitialize(mEGLDisplay, NULL, NULL);
// start the EventThread
if (vsyncPhaseOffsetNs != sfVsyncPhaseOffsetNs) {
sp<VSyncSource> vsyncSrc = new DispSyncSource(&mPrimaryDispSync,
vsyncPhaseOffsetNs, true, "app");
mEventThread = new EventThread(vsyncSrc);
@ -460,6 +461,12 @@ void SurfaceFlinger::init() {
sfVsyncPhaseOffsetNs, true, "sf");
mSFEventThread = new EventThread(sfVsyncSrc);
mEventQueue.setEventThread(mSFEventThread);
} else {
sp<VSyncSource> vsyncSrc = new DispSyncSource(&mPrimaryDispSync,
vsyncPhaseOffsetNs, true, "sf-app");
mEventThread = new EventThread(vsyncSrc);
mEventQueue.setEventThread(mEventThread);
}
// Initialize the H/W composer object. There may or may not be an
// actual hardware composer underneath.
@ -3137,11 +3144,13 @@ status_t SurfaceFlinger::onTransact(
}
case 1018: { // Modify Choreographer's phase offset
n = data.readInt32();
if (mEventThread != NULL)
mEventThread->setPhaseOffset(static_cast<nsecs_t>(n));
return NO_ERROR;
}
case 1019: { // Modify SurfaceFlinger's phase offset
n = data.readInt32();
if (mSFEventThread != NULL)
mSFEventThread->setPhaseOffset(static_cast<nsecs_t>(n));
return NO_ERROR;
}