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doc/tracing: add 'Value doesn't exist' gotcha

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Moses Turner 2021-07-02 00:40:58 -05:00
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doc/tracing.md
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@ -63,3 +63,13 @@ Then run the following commands before launching Monado.
[Perfetto]: https://perfetto.dev
[Percetto]: https://github.com/olvaffe/percetto
## Gotchas
Here's where we write down silly things we ran into while using Perfetto/Percetto.
### "Value doesn't exist" in web viewer
This is probably because you don't have read permissions on your tracefile, probably because you ran traced/tracebox as root. Don't do that, instead do `sudo chown -R $USER /sys/kernel/tracing` and run traced/tracebox as your normal user.
(If you really have to run it as root, then before you open the tracefile do `sudo chown $USER <tracefile>`).