Unable to display GPU frequency

[Dopezhi]

Recently, I found that when capturing perfetto trace on Android12, even though I ticked the capture GPU frequency when I started capturing, the GPU frequency still cannot be displayed.

Is there something wrong with the way I did it or is it not showing up for some reason now?

[Lalit Maganti]

The GPU frequency event is not standardised across Android so it's likely that the device you are using to test this on either: a) doesn't emit this event b) emits this event in a different way that Perfetto doesn't now how to collect/interpret.

We can only guarantee that the events work as intended on Pixels. On non-Pixel devices, it's really up to the manufacturer (or a user with the appropriate device) to contribute to Perfetto and add support for dealing with the device specific events.

On Fri, 30 Dec 2022 at 07:53, Dopezhi <dop...@gmail.com> wrote:

Recently, I found that when capturing perfetto trace on Android12, even though I ticked the capture GPU frequency when I started capturing, the GPU frequency still cannot be displayed.

Is there something wrong with the way I did it or is it not showing up for some reason now?

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[Dopezhi]

Thank you for your answer. If I want to display the GPU frequency for my specific Android machine, how should I do it?

[Lalit Maganti]

You'll need to perform some digging to see what ftrace event gives you the GPU frequency data (it may or may not exist). Once you've done that you can follow the process at https://perfetto.dev/docs/contributing/common-tasks#add-a-new-ftrace-event to add the ability for Perfetto to collect this event.

To view this discussion on the web visit https://groups.google.com/d/msgid/perfetto-dev/132b5bdd-f4f6-4e2b-8944-d0dbb165e59dn%40googlegroups.com.

[Dopezhi]

Thanks for your answer, much appreciated.