Add SurfaceFlinger tracing
Bug: 64831661
Test: adb shell service call SurfaceFlinger 1025 i32 1 && adb shell service call SurfaceFlinger 1025 i32 0
Change-Id: Idf272715b52aee5d2d366fbd4a96b0afaaf2d0c7
diff --git a/services/surfaceflinger/SurfaceTracing.h b/services/surfaceflinger/SurfaceTracing.h
new file mode 100644
index 0000000..9b21989
--- /dev/null
+++ b/services/surfaceflinger/SurfaceTracing.h
@@ -0,0 +1,50 @@
+/*
+ * 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 <layerproto/LayerProtoHeader.h>
+#include <utils/Errors.h>
+
+#include <mutex>
+
+using namespace android::surfaceflinger;
+
+namespace android {
+
+/*
+ * SurfaceTracing records layer states during surface flinging.
+ */
+class SurfaceTracing {
+public:
+ void enable();
+ status_t disable();
+ bool isEnabled();
+
+ void traceLayers(const char* where, LayersProto);
+
+private:
+ static constexpr auto DEFAULT_FILENAME = "/data/misc/trace/layerstrace.pb";
+
+ status_t writeProtoFileLocked();
+
+ bool mEnabled = false;
+ std::string mOutputFileName = DEFAULT_FILENAME;
+ std::mutex mTraceMutex;
+ LayersTraceFileProto mTrace;
+};
+
+} // namespace android