Change SF power hints to use early frame predictions
Currently we issue hints at the end of the frame reporting what happened
that frame. However, this is often too late anyway and lacks critical
information not known until after the frame completes, like gpu timing.
By waiting until the next frame start and using those timings along with
information about gpu duration, the new expected present time, and the
new wakeup time, we can instead use those timings to predict the
duration of the upcoming frame and signal in advance of a frame drop.
This patch also changes how and where frame timing is done and measures
gpu duration so we can predict if a cpu speedup can help gpu composition
happen earlier, preventing a drop that way.
Bug: b/195990840
Test: manual
Change-Id: I5f0ae796198631fced503dce8e6c495885fb256a
diff --git a/services/surfaceflinger/tests/unittests/AidlPowerHalWrapperTest.cpp b/services/surfaceflinger/tests/unittests/AidlPowerHalWrapperTest.cpp
index 9ab35d7..53de4a6 100644
--- a/services/surfaceflinger/tests/unittests/AidlPowerHalWrapperTest.cpp
+++ b/services/surfaceflinger/tests/unittests/AidlPowerHalWrapperTest.cpp
@@ -52,6 +52,8 @@
void verifyAndClearExpectations();
void sendActualWorkDurationGroup(std::vector<WorkDuration> durations,
std::chrono::nanoseconds sleepBeforeLastSend);
+ std::chrono::nanoseconds mAllowedDeviation;
+ std::chrono::nanoseconds mStaleTimeout;
};
void AidlPowerHalWrapperTest::SetUp() {
@@ -59,6 +61,9 @@
mMockSession = new NiceMock<MockIPowerHintSession>();
ON_CALL(*mMockHal.get(), getHintSessionPreferredRate(_)).WillByDefault(Return(Status::ok()));
mWrapper = std::make_unique<AidlPowerHalWrapper>(mMockHal);
+ mWrapper->setAllowedActualDeviation(std::chrono::nanoseconds{10ms}.count());
+ mAllowedDeviation = std::chrono::nanoseconds{mWrapper->mAllowedActualDeviation};
+ mStaleTimeout = AidlPowerHalWrapper::kStaleTimeout;
}
void AidlPowerHalWrapperTest::verifyAndClearExpectations() {
@@ -76,6 +81,7 @@
mWrapper->sendActualWorkDuration(duration.durationNanos, duration.timeStampNanos);
}
}
+
WorkDuration toWorkDuration(std::chrono::nanoseconds durationNanos, int64_t timeStampNanos) {
WorkDuration duration;
duration.durationNanos = durationNanos.count();
@@ -83,6 +89,10 @@
return duration;
}
+WorkDuration toWorkDuration(std::pair<std::chrono::nanoseconds, nsecs_t> timePair) {
+ return toWorkDuration(timePair.first, timePair.second);
+}
+
std::string printWorkDurations(const ::std::vector<WorkDuration>& durations) {
std::ostringstream os;
for (auto duration : durations) {
@@ -112,7 +122,7 @@
EXPECT_FALSE(mWrapper->startPowerHintSession());
}
-TEST_F(AidlPowerHalWrapperTest, restartNewPoserHintSessionWithNewThreadIds) {
+TEST_F(AidlPowerHalWrapperTest, restartNewPowerHintSessionWithNewThreadIds) {
ASSERT_TRUE(mWrapper->supportsPowerHintSession());
std::vector<int32_t> threadIds = {1, 2};
@@ -149,12 +159,8 @@
std::chrono::nanoseconds base = 100ms;
// test cases with target work duration and whether it should update hint against baseline 100ms
- const std::vector<std::pair<std::chrono::nanoseconds, bool>> testCases = {{0ms, false},
- {-1ms, false},
- {200ms, true},
- {2ms, true},
- {91ms, false},
- {109ms, false}};
+ const std::vector<std::pair<std::chrono::nanoseconds, bool>> testCases =
+ {{0ms, true}, {-1ms, true}, {200ms, true}, {2ms, true}, {100ms, false}, {109ms, true}};
for (const auto& test : testCases) {
// reset to 100ms baseline
@@ -200,21 +206,21 @@
// 100ms
const std::vector<std::pair<std::vector<std::pair<std::chrono::nanoseconds, nsecs_t>>, bool>>
testCases = {{{{-1ms, 100}}, false},
- {{{91ms, 100}}, false},
- {{{109ms, 100}}, false},
+ {{{100ms - (mAllowedDeviation / 2), 100}}, false},
+ {{{100ms + (mAllowedDeviation / 2), 100}}, false},
+ {{{100ms + (mAllowedDeviation + 1ms), 100}}, true},
+ {{{100ms - (mAllowedDeviation + 1ms), 100}}, true},
{{{100ms, 100}, {200ms, 200}}, true},
{{{100ms, 500}, {100ms, 600}, {3ms, 600}}, true}};
for (const auto& test : testCases) {
// reset actual duration
- sendActualWorkDurationGroup({base}, 80ms);
+ sendActualWorkDurationGroup({base}, mStaleTimeout);
auto raw = test.first;
std::vector<WorkDuration> durations(raw.size());
std::transform(raw.begin(), raw.end(), durations.begin(),
- [](std::pair<std::chrono::nanoseconds, nsecs_t> d) {
- return toWorkDuration(d.first, d.second);
- });
+ [](auto d) { return toWorkDuration(d); });
EXPECT_CALL(*mMockSession.get(), reportActualWorkDuration(durations))
.Times(test.second ? 1 : 0);
sendActualWorkDurationGroup(durations, 0ms);
@@ -222,40 +228,6 @@
}
}
-TEST_F(AidlPowerHalWrapperTest, sendAdjustedActualWorkDuration) {
- ASSERT_TRUE(mWrapper->supportsPowerHintSession());
-
- std::vector<int32_t> threadIds = {1, 2};
- mWrapper->setPowerHintSessionThreadIds(threadIds);
- EXPECT_CALL(*mMockHal.get(), createHintSession(_, _, threadIds, _, _))
- .WillOnce(DoAll(SetArgPointee<4>(mMockSession), Return(Status::ok())));
- ASSERT_TRUE(mWrapper->startPowerHintSession());
- verifyAndClearExpectations();
-
- std::chrono::nanoseconds lastTarget = 100ms;
- EXPECT_CALL(*mMockSession.get(), updateTargetWorkDuration(lastTarget.count())).Times(1);
- mWrapper->setTargetWorkDuration(lastTarget.count());
- std::chrono::nanoseconds newTarget = 105ms;
- mWrapper->setTargetWorkDuration(newTarget.count());
- EXPECT_CALL(*mMockSession.get(), updateTargetWorkDuration(newTarget.count())).Times(0);
- std::chrono::nanoseconds actual = 21ms;
- // 100 / 105 * 21ms = 20ms
- std::chrono::nanoseconds expectedActualSent = 20ms;
- std::vector<WorkDuration> expectedDurations = {toWorkDuration(expectedActualSent, 1)};
-
- EXPECT_CALL(*mMockSession.get(), reportActualWorkDuration(_))
- .WillOnce(DoAll(
- [expectedDurations](const ::std::vector<WorkDuration>& durationsSent) {
- EXPECT_EQ(expectedDurations, durationsSent)
- << base::StringPrintf("actual sent: %s vs expected: %s",
- printWorkDurations(durationsSent).c_str(),
- printWorkDurations(expectedDurations)
- .c_str());
- },
- Return(Status::ok())));
- mWrapper->sendActualWorkDuration(actual.count(), 1);
-}
-
TEST_F(AidlPowerHalWrapperTest, sendActualWorkDuration_exceedsStaleTime) {
ASSERT_TRUE(mWrapper->supportsPowerHintSession());
@@ -269,22 +241,23 @@
auto base = toWorkDuration(100ms, 0);
// test cases with actual work durations and whether it should update hint against baseline
// 100ms
- const std::vector<std::pair<std::vector<std::pair<std::chrono::nanoseconds, nsecs_t>>, bool>>
- testCases = {{{{91ms, 100}}, true}, {{{109ms, 100}}, true}};
+ const std::vector<std::tuple<std::vector<std::pair<std::chrono::nanoseconds, nsecs_t>>,
+ std::chrono::nanoseconds, bool>>
+ testCases = {{{{100ms, 100}}, mStaleTimeout, true},
+ {{{100ms + (mAllowedDeviation / 2), 100}}, mStaleTimeout, true},
+ {{{100ms, 100}}, mStaleTimeout / 2, false}};
for (const auto& test : testCases) {
// reset actual duration
- sendActualWorkDurationGroup({base}, 80ms);
+ sendActualWorkDurationGroup({base}, mStaleTimeout);
- auto raw = test.first;
+ auto raw = std::get<0>(test);
std::vector<WorkDuration> durations(raw.size());
std::transform(raw.begin(), raw.end(), durations.begin(),
- [](std::pair<std::chrono::nanoseconds, nsecs_t> d) {
- return toWorkDuration(d.first, d.second);
- });
+ [](auto d) { return toWorkDuration(d); });
EXPECT_CALL(*mMockSession.get(), reportActualWorkDuration(durations))
- .Times(test.second ? 1 : 0);
- sendActualWorkDurationGroup(durations, 80ms);
+ .Times(std::get<2>(test) ? 1 : 0);
+ sendActualWorkDurationGroup(durations, std::get<1>(test));
verifyAndClearExpectations();
}
}