bug: ProcessSummaryTrack UI is limited to top level process tracks

[dreveman]

With the addition of arbitrarily nested process tracks it would be nice to have all summary tracks support summarization of child tracks even if they don't represent system threads.

@LalitMaganti wdyt?

[LalitMaganti]

Generally in agreement but unclear to me how this would actually work in practice.

[dreveman]

I've only been thinking about at the higher level of what's exposed in the UI but will take a look at how it can be implemented next as we're in agreement that it would be a useful.

[mohammadawwad]

the plugin dev.perfetto.ProcessSummary provides a structured approach for handling nested process summaries by using virtual tables (__intrinsic_counter_mipmap), SQL-based transformations, and TimelineFetcher to dynamically request data. It aggregates thread slices and computes process-level utilization but is limited to main process-based tracks. A similar approach could be beneficial for counter-based tracks, allowing for nested counter summaries that aggregate values across multiple track IDs. Implementing a dev.perfetto.CounterSummary plugin or extending the functionality to nested tracks could help improve counter visualization within large traces and providing hierarchical counter groupings.