Perfetto

Tracing service and probes:
* Added support for recording traces from a system service through the
client API.
* The client library now reconnects producers automatically if the
connection to the tracing service is lost. Also fixed crashes in ongoing
tracing sessions when a disconnect occurs.
* Added support for dpu and g2d ftrace events.
* Enabled commit batching and producer side patching of chunks.
* Add support for symbolizing kernel symbols for ftrace events.
Trace Processor:
* Fixed type affinity of string columns.
UI:
* Added initial support for running metrics from the UI.
* Added support for displaying all flows when a slice or area is selected.
* Highlight nodes that match the 'focus' string in the flamegraph.
* Added search within slice args.
* Fixed details panel height and moved query panel into details panel.
* Enabled re-sharing of postMessage traces by echoing back the original URL.
* Improved record page error messages.

Tracing service and probes:
* Added API for querying registered data sources and their capabilities.
* Added support for profiling heap allocations on Linux via LD_PRELOAD.
* Fixed possible race when initializing the consumer library.
* Fixed subtle bugs on systems with 16KB system pages.
Trace Processor:
* Added a table which lists available metrics.
* Added Python bindings on PyPi in the 'perfetto' package.
* Added support for running trace_processor_shell on Android.
* Added per-process metrics for GPU memory usage.
* Added support for exporting flow events to JSON.
* Added dynamic tables for navigating between slices of flows.
UI:
* Changed time marking: horizontal selection doesn't gray out anymore,
pressing 'm' marks the range.
* Added initial support for displaying flow event arrows.
* Improved ordering of all thread tracks under process grouping.
* Fixed UI crashes due to metric errors
* Fixed selection of thread state slices.

Tracing service and probes:
* Added auto-reconnection to the SDK. Tracing::Initialize() now retries in
the background, instead of failing, if the tracing service is unrechable.
* Added support for recording cpuhp (CPU hotplug) ftrace events.
* Fixed heap profiling unwinding on multi-ABI systems.
* Fixed reporting of live objects in the native heap profiler when using
--dump-at-max.
* Fixed crash when writing trace events with field nesting level > 10.
Trace Processor:
* Added Python bindings, see
https://perfetto.dev/docs/analysis/trace-processor#python-api .
* Added ingestion for Chrome instant events and Chrome flow events.
* Added ingestion for Android GPU memory events and sched_blocked_reason.
* Added WebView power metric.
* Added support for WSL1 where Async I/O is not available.
* Improved detection of Android suspend/resume events.
UI:
* Added GPU memory recording controls and ingestion code. Requires a recent
Android 12+ kernel.
* Added details panel for flow events, showed when the user selects a slice
involved in a flow (arrows in the UI are still being worked on).
* Added instant events rendering.
* Added Google Analytics.
* Fixed I/O thread-states in 4.14 kernels to deal with the removal of
wake-kill using sched_blocked_reason.
* Fixed "Perfetto UI started debugging this browser" showing when opening
the UI and the Chrome extension is installed.
Misc:
* Update language to comply with Android's inclusive language guidance.

Tracing service and probes:
* Added ftrace thermal events.
* Added support for custom allocators to the heap profiler. Allows
developers to report memory allocations that are not done through malloc.
* Added detailed timestamping of key tracing session events.
* Added support for building tracing services on CrOS (system-wide tracing).
* Fixed filtering out of stale ftrace data that predates the beginning of
the tracing session.
Trace Processor:
* Improved profile symbolizer. PERFETTO_SYMBOLIZER_MODE=index discovers
symbol files by build id rather than name.
* Added screen-state Android metrics.
UI:
* Added 'Info and stats' page to debug data losses and trace stats.
* Added full cmdline to process detail panel.
* Improved performance of async tracks using quantized queries.
* Improved performance of counter and slice tracks for long traces by
pre-caching quantized track data.
* Improved actionablility of crash dialog when the Wasm module OOMs.

Tracing service and probes:
* Added gpu_mem_total ftrace event.
* Added TrustZone (scm start/end) event.
* Added protos for GPU memory tracking and updated render stages proto.
* Added time_in_state probe for Android (CPU time broken down by frequency).

Trace Processor:
* Added ingestion of IRQ and SoftIRQ events.
* Added ingestion of workqueue events. KAddr symbolization still missing.
* Added ingestion of voltage regulators and board clock change events.
* Added ingestion of new ION ion_buffer_create/destroy events.
* Added ingestion of TrustZone (scm start/end) events.
* Added SurfaceFlinger derived events (tracking of missed frames).
* Changed parsing of scheduler task state on 4.14 kernels.
* Changed importing of Java heap graphs: allow partial dumps.
* Improved performance of the SQL query engine.

UI:
* Added dedicated query page for custom SQL queries.
* Added navigation links for Binder slices.
* Removed overview summary mode when zoomed out.
* Fixed recording page when targeting Android P.
* Improved slice pan/zoom performance by quantizing.