perfetto source code confusion

[qiu]

On the root version, when I use perfetto to fetch sufaceflinger's layer information, I occasionally grab information such as ftrace. This is because I use the/apps/Traceur src_common/com/android/Traceur PerfettoUtils folder used two buffer, 0 buffer is used to grab ftrace, If buffer 0 is not set on the application side, files with layer information cannot be captured. How do I mask ftrace files on the root version?
The source code is as follows:
// Allots 1 / BUFFER_SIZE_RATIO to the small buffer and the remainder to the large buffer,
// (less the size of the buffer reserved for unchanging system information).
int totalBufferSizeKb = numCpus * bufferSizeKb - SYSTEM_INFO_BUFFER_SIZE_KB;
int targetBuffer1Kb = totalBufferSizeKb / BUFFER_SIZE_RATIO;
int targetBuffer0Kb = totalBufferSizeKb - targetBuffer1Kb;

// This is target_buffer: 0, which is used for ftrace and the ftrace-derived
// android.gpu.memory.
appendTraceBuffer(config, targetBuffer0Kb);

// This is target_buffer: 1, which is used for additional data sources.
appendTraceBuffer(config, targetBuffer1Kb);

// This is target_buffer: 2, used for unchanging system information like the packages
// list.
appendTraceBuffer(config, SYSTEM_INFO_BUFFER_SIZE_KB);

[Kirill Timofeev]

+Ryan Savitski 

Could you please take a look?

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[Ryan Savitski]

Thank you for the message but I do not understand your problem. You can collect traces via "adb shell" without any involvement from the Traceur app. See the documentation here: https://perfetto.dev/docs/quickstart/android-tracing. 

Additionally, here is the documentation on buffer mapping: https://perfetto.dev/docs/concepts/config.