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Ran 23 Jun 2025 12:29PM UTC

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Committed 23 Jun 2025 12:25PM UTC coverage: 77.719%. Remained the same

Job # 15824179991.1

Build Type

push

github

Committed by

web-flow

Commit Message

Optimize `xapi<->xenopsd` communication (#6549)

Some refactoring, but the most important commit is this one-line change
that greatly improves things on its own:

---

xenopsd: Remove `data/updated` from the list of watched paths

"data/updated" is not read or used anywhere in xenopsd or xapi:
* xapi_guest_agent's last_updated field is just Unix.gettimeofday ().
* xapi_xenops removes "data/updated" from the guest agent state
altogether before
checking if it's changed:

```
let ignored_keys = ["data/meminfo_free"; "data/updated"; "data/update_cnt"]
```

So there is no need to watch this path at all.

This greatly reduces unnecessary traffic between xapi and xenopsd, since
any VM
with a guest agent would write to data/updated once every 60 seconds,
which
would generate a Dynamic.Vm event, making xapi call xenopsd's VM.stat to
rescan
the domain's xenstore tree and perform several hypercalls. Almost
always, this
would be completely unnecessary as nothing else about the VM would
change, but
a lot of work would be done anyhow.

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