v26.1 - 2022-06-13:
Trace Processor:
* Fixed build failures on Windows.
v26.0 - 2022-06-13:
Tracing service and probes:
* Added wildcard (*) support when targeting processes by their command line
in the Android perf profiler ("linux.perf" data source) and Java heap
snapshots ("android.java_hprof").
* Added support for kernel thread sampling, and kernel-only callstacks in
the Android perf profiler.
* Fixed rare crash when parsing zero-length ftrace __data_loc strings.
* Fixed rare crash on 4.19 kernel when encountering unexpected zero-padded
ftrace pages.
* Removed capturing of thread_time_in_state (per-UID, per-OOM-adj time).
The data was unused and subsumed by correlating sched data with power
rail monitors.
Trace Processor:
* Added CREATE_VIEW_FUNCTION operator to define a SQL function that can
return a temporary table and yield multiple rows and columns.
* Changed kernel threads to be represented as single-thread processes in
Linux system traces. The (incorrect) legacy behaviour was to treat them
as threads of the kthreadd process.
* Added ABS_TIME_STR function which converts a trace timestamp to
an ISO8601 string.
* Added ingestion for phase='R' events, used by performance.{now,mark}().
* Changed 'trace_to_text' to be named 'traceconv'. The source
location also moved from 'tools/trace_to_text' to 'src/traceconv'.
* Changed compiler flags, added -mavx2. The previous patch in v22.0 was
supposed to add AVX2 support but added only AVX.
* Changed the handling of the last per-cpu sched slices: rather than
extending the last event to the end of the trace, the last scheduling
event has a -1 duration. UIs are supposed to deal with visual extension.
* Removed android_thread_time_in_state metric. It was an experiment and was
unused.
* Removed `instant` table. All instant events are now 0-duration events in
the `slice` table.
* Removed the /raw_query REST endpoint from --httpd. This will break very
old clients that have not switched over the new streaming-based /query
endoint or even newer /websocket.
UI:
* Changed detail panel to separate slice args from generic slice properties.
* Automatically enabled sched_compact when generating trace configs for
Android S+ targets.
SDK:
* Added option for recording thread CPU times at the beginning and end of
each slice.
* Added perfetto::DynamicString() to use non-literal strings as event names
in the TRACE_EVENT API.
* Remove the pre-SDK consumer_api_deprecated interface. It was introduced
for iorapd, now deleted from the Android tree.
