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/*
* Copyright 2017 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.
*/
#pragma once
#include <android-base/thread_annotations.h>
#include <layerproto/LayerProtoHeader.h>
#include <utils/Errors.h>
#include <utils/StrongPointer.h>
#include <condition_variable>
#include <memory>
#include <mutex>
#include <queue>
#include <thread>
using namespace android::surfaceflinger;
namespace android {
class SurfaceFlinger;
constexpr auto operator""_MB(unsigned long long const num) {
return num * 1024 * 1024;
}
/*
* SurfaceTracing records layer states during surface flinging.
*/
class SurfaceTracing {
public:
explicit SurfaceTracing(SurfaceFlinger& flinger);
bool enable();
bool disable();
status_t writeToFile();
bool isEnabled() const;
void notify(const char* where);
void notifyLocked(const char* where) NO_THREAD_SAFETY_ANALYSIS /* REQUIRES(mSfLock) */;
void setBufferSize(size_t bufferSizeInByte);
void writeToFileAsync();
void dump(std::string& result) const;
enum : uint32_t {
TRACE_CRITICAL = 1 << 0,
TRACE_INPUT = 1 << 1,
TRACE_COMPOSITION = 1 << 2,
TRACE_EXTRA = 1 << 3,
TRACE_HWC = 1 << 4,
TRACE_ALL = 0xffffffff
};
void setTraceFlags(uint32_t flags);
bool flagIsSetLocked(uint32_t flags) NO_THREAD_SAFETY_ANALYSIS /* REQUIRES(mSfLock) */ {
return (mTraceFlags & flags) == flags;
}
private:
static constexpr auto kDefaultBufferCapInByte = 5_MB;
static constexpr auto kDefaultFileName = "/data/misc/wmtrace/layers_trace.pb";
class LayersTraceBuffer { // ring buffer
public:
size_t size() const { return mSizeInBytes; }
size_t used() const { return mUsedInBytes; }
size_t frameCount() const { return mStorage.size(); }
void setSize(size_t newSize) { mSizeInBytes = newSize; }
void reset(size_t newSize);
void emplace(LayersTraceProto&& proto);
void flush(LayersTraceFileProto* fileProto);
private:
size_t mUsedInBytes = 0U;
size_t mSizeInBytes = 0U;
std::queue<LayersTraceProto> mStorage;
};
void mainLoop();
bool addFirstEntry();
LayersTraceProto traceWhenNotified();
LayersTraceProto traceLayersLocked(const char* where) REQUIRES(mSfLock);
// Returns true if trace is enabled.
bool addTraceToBuffer(LayersTraceProto& entry);
void writeProtoFileLocked() REQUIRES(mTraceLock);
SurfaceFlinger& mFlinger;
status_t mLastErr = NO_ERROR;
std::thread mThread;
std::condition_variable mCanStartTrace;
std::mutex& mSfLock;
uint32_t mTraceFlags GUARDED_BY(mSfLock) = TRACE_CRITICAL | TRACE_INPUT;
const char* mWhere GUARDED_BY(mSfLock) = "";
uint32_t mMissedTraceEntries GUARDED_BY(mSfLock) = 0;
bool mTracingInProgress GUARDED_BY(mSfLock) = false;
mutable std::mutex mTraceLock;
LayersTraceBuffer mBuffer GUARDED_BY(mTraceLock);
size_t mBufferSize GUARDED_BY(mTraceLock) = kDefaultBufferCapInByte;
bool mEnabled GUARDED_BY(mTraceLock) = false;
bool mWriteToFile GUARDED_BY(mTraceLock) = false;
};
} // namespace android
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