如何理解Walk through your investigation / Perfetto 排查思路？

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标准回答

When investigating a performance issue, I would first define the symptom clearly. Is it slow startup, delayed input response, or animation jank?

Then I would capture a trace that includes the relevant time window and locate the affected threads.

For the main thread, I would check whether it is running, runnable, or waiting.

If it is running for a long time, I would look at the work being executed and use CPU profiling if more detail is needed.

If it is runnable but not getting CPU time, I would investigate scheduling delays and CPU contention.

If it is waiting, I would check whether it is waiting for a lock, a Binder reply, or I/O. I would then follow that dependency instead of stopping at the main thread.

For a rendering issue, I would also examine RenderThread and SurfaceFlinger.

I would use these observations to form a hypothesis, verify it, and compare the results under consistent test conditions.

表达顺序

定义现象 → 抓 Trace → 看线程状态 → 追依赖 → 验证假设

说明

用 “I would” 表达排查思路。Running：正在 CPU 上运行；Runnable：可以运行，但尚未获得 CPU；Waiting：等待其他条件。

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