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.
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).
