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/*
* Copyright 2020 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
namespace android {
// Jank information tracked by SurfaceFlinger(SF) for perfetto tracing and telemetry.
enum JankType {
// No Jank
None = 0x0,
// Jank that occurs in the layers below SurfaceFlinger
DisplayHAL = 0x1,
// SF took too long on the CPU
SurfaceFlingerCpuDeadlineMissed = 0x2,
// SF took too long on the GPU
SurfaceFlingerGpuDeadlineMissed = 0x4,
// Either App or GPU took too long on the frame
AppDeadlineMissed = 0x8,
// Vsync predictions have drifted beyond the threshold from the actual HWVsync
PredictionError = 0x10,
// Janks caused due to the time SF was scheduled to work on the frame
// Example: SF woke up too early and latched a buffer resulting in an early present
SurfaceFlingerScheduling = 0x20,
// A buffer is said to be stuffed if it was expected to be presented on a vsync but was
// presented later because the previous buffer was presented in its expected vsync. This
// usually happens if there is an unexpectedly long frame causing the rest of the buffers
// to enter a stuffed state.
BufferStuffing = 0x40,
// Jank due to unknown reasons.
Unknown = 0x80,
// SF is said to be stuffed if the previous frame ran longer than expected resulting in the case
// where the previous frame was presented in the current frame's expected vsync. This pushes the
// current frame to the next vsync. The behavior is similar to BufferStuffing.
SurfaceFlingerStuffing = 0x100,
};
} // namespace android
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