xapi-project / xen-api / 23309346722
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CP-311148/CP-311150: add a quicktest for XAPI memory overhead calculations (#6858)

Test that we can fill a host with 1 VM, with N VMs, based on
maximise_memory/compute_memory_overhead.

Check that the constant factors used in XAPI are correct, e.g. amount of
memory used/vcpu.
Can be used to validate these PRs:
https://github.com/xapi-project/xen-api/pull/6855
https://github.com/xapi-project/xen-api/pull/6854

There is also a pagetable overhead calculation, but something weird is
going on there:
```
[2026-01-22T18:40:49.342348481-00:00|0000000000000000]  pagetables,memory_overhead_pages,coeff,vms
[2026-01-22T18:40:49.342333285-00:00|0000000000000000]  64,793,12.3906,9223372036854775807
[2026-01-22T18:40:49.342335974-00:00|0000000000000000]  192,1305,6.79688,9223372036854775807
[2026-01-22T18:40:49.342337658-00:00|0000000000000000]  448,2329,5.19866,9223372036854775807
[2026-01-22T18:40:49.342339751-00:00|0000000000000000]  962,4377,4.5499,9223372036854775807
[2026-01-22T18:40:49.342341392-00:00|0000000000000000]  263102,1048827,3.98639,9223372036854775807
[2026-01-22T18:40:49.342343128-00:00|0000000000000000]  526273,2097403,3.98539,9223372036854775807
[2026-01-22T18:40:49.342345071-00:00|0000000000000000]  708913,2825211,3.98527,9223372036854775807
```

That should be ~4, don't know why it'd be 13, it used to be reliably 4
previously, could be a bug in the test.
That'll need further investigation (also there is enough free memory on
the host that this underestimate doesn't actually cause a failure, which
is also unexpected).

3504 of 4355 relevant lines covered (80.46%)

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Jobs
ID Job ID Ran Files Coverage
1 python3.11 - 23309346722.1 34
80.46
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Source Files on build 23309346722