tree c7002d19a276ee8bc966d319a69bb835f41a6cee
parent ee7355902ac7bd1ba8645fee4f89ca5ed29bbb82
author Primiano Tucci <primiano@google.com> 1621886773 +0100
committer Primiano Tucci <primiano@google.com> 1621886773 +0100

traced_probes: Don't set --only_userspace on older atrace

atrace --only_userspace was introduced only in Android P.
When sideloading perfetto on older versions of android,
any tracing session that involves atrace will fail,
because older versions of android don't understand that
option.
This CL makes it fallback gracefully by checking the
Android version at runtime. When an older version of
Android is detecte we do two things:
- Don't pass --only_userspace
- Relax the "somebody did unexpectedly enable ftrace"
  checks (Because atrace would do that).

Also, because of the invasiveness of atrace without
--only-userspace, we prevent concurrent tracing sessions.

Test: manual on a Pixel 2 runing Android O device:
       tools/record_android_trace -b 256mb -t 60s sched gfx view irq adb camera -a* --sideload-path out/android_release_arm64/stripped/tracebox
Bug: 158465724
Change-Id: Ie6f222bf26724bb2a4cfa7a811bf8e3228a5260e