Perfetto release v22.0 - CHANGELOG

[primiano]

https://android.googlesource.com/platform/external/perfetto/+/refs/tags/v22.0
https://github.com/google/perfetto/tree/v22.0

v22.0 - 2021-12-03:
  Tracing service and probes:
    * Added Android SDK version to the SystemInfo trace packet.
    * Changed compiler flags. Assume recent x64 CPUs (-msse4.2 -mavx -mpopcnt).
      This behavior affects only standalone builds and can be changed by setting
      enable_perfetto_x64_cpu_opt=false in the GN args.
    * The java heap profiler now rescans all the processes every time for
      continous_dump_config. The scan_pids_only_on_start can be used to restore
      the old behavior.
    * Added support for building on ARM Macs.
    * Added support for the rss_stat_throttled event on Android via
      FtraceConfig.throttle_rss_stat. In newer Android kernels the base rss_stat
      event is now unthrottled. rss_stat used to be throttled by a downstream
      kernel change, unnecessary after https://lkml.org/lkml/2021/10/25/1411 .
      atrace.rc configures throttling from userspace at boot.
    * Fixed a bug that caused IPCs to stall traced and hit the watchdog if in
      the middle of a suspend/resume. Switched from SND_TIMEO to poll(POLLOUT).
    * Added "linux.sysfs_power" data source to poll /sys/class/power_supply/
      and report periodically battery charge and drain rate if supported.
  Trace Processor:
    * Speeded up proto trace ingestion by 2x (~20 MB/s -> ~40 MB/s).
    * Changed LIKE comparisions to be case-senstive. This may break existing
      queries but was a necessary from a performance perspective.
      Going forward, GLOB must be used, instead of LIKE, for checked in metrics
      to avoid unnecessary slowdowns.
    * Changed compiler flags, assume recent x64 CPUs (see above).
    * Changed how displayTimeUnit is handled in JSON traces to match catapult.
    * Added websocket endpoint to RPC interface to reduce query latency.
    * Added support for hot-reloading metrics (see //docs/analysis/metrics.md).
  UI:
    * Added ability to save/restore record config. Remember last used config.
    * Fixed bug causing the recording page to hold onto the USB interface making
      adb unusable after a recording session.
  SDK:
    * Added UpdateDataSource() descriptor IPC endpoint to allow updates of the
      data source capabilities (e.g., category list for track event

[primiano]

We had a respin (v22.0 -> v22.1) this month to deal with a Windows build breakage.

https://android.googlesource.com/platform/external/perfetto/+/refs/tags/v22.1

https://github.com/google/perfetto/tree/v22.1

v22.1 - 2021-12-07:
  Tracing service and probes:
    * Added workaround for a Linux kernel bug causing some ftrace strings to
      be non-null-terminated (https://github.com/torvalds/linux/commit/f0a5157).
  Trace Processor:
    * Fixed build failures on Windows.