tree b7b656f5b6dd47eb4a0e907adb86cdc90308685d
parent d23ba31cd55e1499ed76d98089a697b4ef5a85cc
author Jorim Jaggi <jjaggi@google.com> 1637258688 +0100
committer Jorim Jaggi <jjaggi@google.com> 1639408822 +0000

Add cheap aidl tracing suitable for always-on-tracing (2/3)

Instead of having only one switch to enable all binder tracing,
we seperate between stack tracking and tracing. Stack tracking
still works as before. However, the more lightweight option,
tracing using android.os.Trace, is toggleable separately and will
work on the receiver side without dumping the entire stack trace.

We also make the tracing more efficient by caching
getTransactionName and concatting the class name.

Also, enable this selectively for SysUI+Launcher, which is
currently the focus of always-on-tracing effort to figure out
what kind of binder calls these processes are calling which seems
to contribute a huge amount of jank (long binder calls are in
>= 50% of janky traces).

Test: external/perfetto/tools/record_android_trace gfx view freq sched wm am aidl
Test: atest aidl_unittest
Bug: 202278427
Change-Id: Ic71fd925c6df71f82ddacfb42360b86257feb1cb
Merged-In: Ic71fd925c6df71f82ddacfb42360b86257feb1cb