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doc: Update tracing.md

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Jakob Bornecrantz 2022-04-15 13:08:24 +01:00
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doc/tracing.md
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@ -1,7 +1,7 @@
# Tracing support {#tracing}
<!--
Copyright 2021, Collabora, Ltd. and the Monado contributors
Copyright 2021-2022, Collabora, Ltd. and the Monado contributors
SPDX-License-Identifier: BSL-1.0
-->
@ -61,15 +61,33 @@ Then run the following commands before launching Monado.
./perfetto/out/linux_clang_release/perfetto --txt -c data_events.cfg -o /tmp/trace.protobuf
```
[Perfetto]: https://perfetto.dev
[Percetto]: https://github.com/olvaffe/percetto
Finally run the App and Monado with `XRT_TRACING=true` exported.
```bash
XRT_TRACING=true monado-serivce
```
## Gotchas
Here's where we write down silly things we ran into while using Perfetto/Percetto.
Here's where we write down bugs or other sharp corners that we found while
running Monado with [Perfetto][]/[Percetto][] and tracing enabled.
### OpenXR CTS
Running multiple CTS tests in one run causes Perfetto to crash, this is because
the CTS loads and unloads the OpenXR runtime multiple times, and there seems to
be a race on destruction.
### "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.
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>`).
(If you really have to run it as root, then before you open the tracefile do
`sudo chown $USER <tracefile>`).
[Perfetto]: https://perfetto.dev
[Percetto]: https://github.com/olvaffe/percetto