convert android command line parameters to config file about perfetto HOT 5 CLOSED

The code to do the conversion can be found at https://cs.android.com/android/platform/superproject/main/+/main:external/perfetto/src/perfetto_cmd/config.cc but TLDR:

• -t maps to duration_ms in the config
• all of the atrace categories map to the atrace_categories section of the linux.ftrace datasource

see the "full trace config" section of https://perfetto.dev/docs/quickstart/android-tracing#recording-a-trace-through-the-cmdline for information on this.

from perfetto.

In general the best way to solve this problem is:

1. Capture a trace via the cmdline (`-t 20s yada yada')
2. Open the trace with the UI and look at the 'Info and stats page'
3. Copy the full text config that is reported there. That is the translation that the code lalit linked does.
4. profit

from perfetto.

Wow, that smart way! one question I have Trace.beginSection("MySection") in java code, but with that config, I still not see "MySection" keyword in trace, any other config should I add for this?

from perfetto.

I still not see "MySection" keyword in trace, any other config should I add for this?

You are likely not including your app's package in atrace_apps section of the config.

from perfetto.

-a 'app name', which translates into atrace_apps: "app name" in the ftrace section of the config.
Example:

data_sources {
  config {
    name: "linux.ftrace"
    target_buffer: 0
    trace_duration_ms: 0
    tracing_session_id: 0
    enable_extra_guardrails: false
    ftrace_config {
      ftrace_events: "sched/sched_switch"
      ftrace_events: "power/suspend_resume"
      ...
      atrace_apps: "lmkd"   # !!!!!!!!!!!!!!!!! THIS
    }

from perfetto.