tree 482b708d0e571768d08add2a37c0a9eb73900482
parent d38e3531e4f13929a02feaaf05328b04f68a59c2
author Kevin Jeon <kevinjeon@google.com> 1668019188 +0000
committer Kevin Jeon <kevinjeon@google.com> 1668176951 +0000

Save existing temporary traces on reboot

This change modifies PerfettoUtils to save in-progress traces found
after boot (instead of deleting them). This is intended to help debug
issues that may have caused the device to shut down.

In-progress traces found on reboot will only be saved properly if
Traceur is configured to capture long traces. This is because long
traces write data directly to disk, while normal traces do not. In
addition, traces recovered in this way may be incomplete--for example,
process IDs are saved and viewable in the Perfetto UI, but process names
are missing.

Test: Check that long traces started before a manual reboot are saved at
      /data/local/traces/recovered-trace-[info].perfetto-trace, and that
      this file can be opened in the Perfetto UI (ui.perfetto.dev).
Bug: 258261969
Change-Id: If91b040e154242cd790f2f26cfaf1329943590f4