ui: Fix grouping of iostat tracks NullTracks are normally used to make an empty summary track so sort them to the top. Before: https://screenshot.googleplex.com/8KjpRjL3GzYbnnc After: https://screenshot.googleplex.com/8XSxGGcyuR5sMwV Change-Id: I1fc9ba3a442e03f3829f2979675d13f7feecde9a
Perfetto is a production-grade open-source stack for performance instrumentation and trace analysis. It offers services and libraries and for recording system-level and app-level traces, native + java heap profiling, a library for analyzing traces using SQL and a web-based UI to visualize and explore multi-GB traces.
See https://perfetto.dev/docs or the /docs/ directory for documentation.