/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "JankTracker.h"
#include <errno.h>
#include <inttypes.h>
#include <statslog.h>
#include <sys/mman.h>
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <limits>
#include <cutils/ashmem.h>
#include <log/log.h>
#include <sstream>
#include "Properties.h"
#include "utils/TimeUtils.h"
#include "utils/Trace.h"
namespace android {
namespace uirenderer {
struct Comparison {
JankType type;
std::function<int64_t(nsecs_t)> computeThreadshold;
FrameInfoIndex start;
FrameInfoIndex end;
};
static const std::array<Comparison, 4> COMPARISONS{
Comparison{JankType::kMissedVsync, [](nsecs_t) { return 1; }, FrameInfoIndex::IntendedVsync,
FrameInfoIndex::Vsync},
Comparison{JankType::kSlowUI,
[](nsecs_t frameInterval) { return static_cast<int64_t>(.5 * frameInterval); },
FrameInfoIndex::Vsync, FrameInfoIndex::SyncStart},
Comparison{JankType::kSlowSync,
[](nsecs_t frameInterval) { return static_cast<int64_t>(.2 * frameInterval); },
FrameInfoIndex::SyncStart, FrameInfoIndex::IssueDrawCommandsStart},
Comparison{JankType::kSlowRT,
[](nsecs_t frameInterval) { return static_cast<int64_t>(.75 * frameInterval); },
FrameInfoIndex::IssueDrawCommandsStart, FrameInfoIndex::FrameCompleted},
};
// If the event exceeds 10 seconds throw it away, this isn't a jank event
// it's an ANR and will be handled as such
static const int64_t IGNORE_EXCEEDING = seconds_to_nanoseconds(10);
/*
* We don't track direct-drawing via Surface:lockHardwareCanvas()
* for now
*
* TODO: kSurfaceCanvas can negatively impact other drawing by using up
* time on the RenderThread, figure out how to attribute that as a jank-causer
*/
static const int64_t EXEMPT_FRAMES_FLAGS = FrameInfoFlags::SurfaceCanvas;
// For testing purposes to try and eliminate test infra overhead we will
// consider any unknown delay of frame start as part of the test infrastructure
// and filter it out of the frame profile data
static FrameInfoIndex sFrameStart = FrameInfoIndex::IntendedVsync;
JankTracker::JankTracker(ProfileDataContainer* globalData, const DisplayInfo& displayInfo) {
mGlobalData = globalData;
nsecs_t frameIntervalNanos = static_cast<nsecs_t>(1_s / displayInfo.fps);
nsecs_t sfOffset = frameIntervalNanos - (displayInfo.presentationDeadline - 1_ms);
nsecs_t offsetDelta = sfOffset - displayInfo.appVsyncOffset;
// There are two different offset cases. If the offsetDelta is positive
// and small, then the intention is to give apps extra time by leveraging
// pipelining between the UI & RT threads. If the offsetDelta is large or
// negative, the intention is to subtract time from the total duration
// in which case we can't afford to wait for dequeueBuffer blockage.
if (offsetDelta <= 4_ms && offsetDelta >= 0) {
// SF will begin composition at VSYNC-app + offsetDelta. If we are triple
// buffered, this is the expected time at which dequeueBuffer will
// return due to the staggering of VSYNC-app & VSYNC-sf.
mDequeueTimeForgiveness = offsetDelta + 4_ms;
}
setFrameInterval(frameIntervalNanos);
}
void JankTracker::setFrameInterval(nsecs_t frameInterval) {
mFrameInterval = frameInterval;
for (auto& comparison : COMPARISONS) {
mThresholds[comparison.type] = comparison.computeThreadshold(frameInterval);
}
}
void JankTracker::finishFrame(const FrameInfo& frame) {
// Fast-path for jank-free frames
int64_t totalDuration = frame.duration(sFrameStart, FrameInfoIndex::FrameCompleted);
if (mDequeueTimeForgiveness && frame[FrameInfoIndex::DequeueBufferDuration] > 500_us) {
nsecs_t expectedDequeueDuration = mDequeueTimeForgiveness + frame[FrameInfoIndex::Vsync] -
frame[FrameInfoIndex::IssueDrawCommandsStart];
if (expectedDequeueDuration > 0) {
// Forgive only up to the expected amount, but not more than
// the actual time spent blocked.
nsecs_t forgiveAmount =
std::min(expectedDequeueDuration, frame[FrameInfoIndex::DequeueBufferDuration]);
LOG_ALWAYS_FATAL_IF(forgiveAmount >= totalDuration,
"Impossible dequeue duration! dequeue duration reported %" PRId64
", total duration %" PRId64,
forgiveAmount, totalDuration);
totalDuration -= forgiveAmount;
}
}
LOG_ALWAYS_FATAL_IF(totalDuration <= 0, "Impossible totalDuration %" PRId64, totalDuration);
mData->reportFrame(totalDuration);
(*mGlobalData)->reportFrame(totalDuration);
// Only things like Surface.lockHardwareCanvas() are exempt from tracking
if (CC_UNLIKELY(frame[FrameInfoIndex::Flags] & EXEMPT_FRAMES_FLAGS)) {
return;
}
if (totalDuration > mFrameInterval) {
mData->reportJank();
(*mGlobalData)->reportJank();
}
bool isTripleBuffered = mSwapDeadline > frame[FrameInfoIndex::IntendedVsync];
mSwapDeadline = std::max(mSwapDeadline + mFrameInterval,
frame[FrameInfoIndex::IntendedVsync] + mFrameInterval);
// If we hit the deadline, cool!
if (frame[FrameInfoIndex::FrameCompleted] < mSwapDeadline || totalDuration < mFrameInterval) {
if (isTripleBuffered) {
mData->reportJankType(JankType::kHighInputLatency);
(*mGlobalData)->reportJankType(JankType::kHighInputLatency);
}
return;
}
mData->reportJankType(JankType::kMissedDeadline);
(*mGlobalData)->reportJankType(JankType::kMissedDeadline);
// Janked, reset the swap deadline
nsecs_t jitterNanos = frame[FrameInfoIndex::FrameCompleted] - frame[FrameInfoIndex::Vsync];
nsecs_t lastFrameOffset = jitterNanos % mFrameInterval;
mSwapDeadline = frame[FrameInfoIndex::FrameCompleted] - lastFrameOffset + mFrameInterval;
for (auto& comparison : COMPARISONS) {
int64_t delta = frame.duration(comparison.start, comparison.end);
if (delta >= mThresholds[comparison.type] && delta < IGNORE_EXCEEDING) {
mData->reportJankType(comparison.type);
(*mGlobalData)->reportJankType(comparison.type);
}
}
// Log daveys since they are weird and we don't know what they are (b/70339576)
if (totalDuration >= 700_ms) {
static int sDaveyCount = 0;
std::stringstream ss;
ss << "Davey! duration=" << ns2ms(totalDuration) << "ms; ";
for (size_t i = 0; i < static_cast<size_t>(FrameInfoIndex::NumIndexes); i++) {
ss << FrameInfoNames[i] << "=" << frame[i] << ", ";
}
ALOGI("%s", ss.str().c_str());
// Just so we have something that counts up, the value is largely irrelevant
ATRACE_INT(ss.str().c_str(), ++sDaveyCount);
android::util::stats_write(android::util::DAVEY_OCCURRED, getuid(), ns2ms(totalDuration));
}
}
void JankTracker::dumpData(int fd, const ProfileDataDescription* description,
const ProfileData* data) {
if (description) {
switch (description->type) {
case JankTrackerType::Generic:
break;
case JankTrackerType::Package:
dprintf(fd, "\nPackage: %s", description->name.c_str());
break;
case JankTrackerType::Window:
dprintf(fd, "\nWindow: %s", description->name.c_str());
break;
}
}
if (sFrameStart != FrameInfoIndex::IntendedVsync) {
dprintf(fd, "\nNote: Data has been filtered!");
}
data->dump(fd);
dprintf(fd, "\n");
}
void JankTracker::dumpFrames(int fd) {
dprintf(fd, "\n\n---PROFILEDATA---\n");
for (size_t i = 0; i < static_cast<size_t>(FrameInfoIndex::NumIndexes); i++) {
dprintf(fd, "%s", FrameInfoNames[i].c_str());
dprintf(fd, ",");
}
for (size_t i = 0; i < mFrames.size(); i++) {
FrameInfo& frame = mFrames[i];
if (frame[FrameInfoIndex::SyncStart] == 0) {
continue;
}
dprintf(fd, "\n");
for (int i = 0; i < static_cast<int>(FrameInfoIndex::NumIndexes); i++) {
dprintf(fd, "%" PRId64 ",", frame[i]);
}
}
dprintf(fd, "\n---PROFILEDATA---\n\n");
}
void JankTracker::reset() {
mFrames.clear();
mData->reset();
(*mGlobalData)->reset();
sFrameStart = Properties::filterOutTestOverhead ? FrameInfoIndex::HandleInputStart
: FrameInfoIndex::IntendedVsync;
}
} /* namespace uirenderer */
} /* namespace android */