Make xcp-rrdp-cpu more robust#6418
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last-genius
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Apr 11, 2025
lindig
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Apr 11, 2025
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Would add this. Debug level is |
…wn races Note that this hostload metric is completely wrong, and we should probably drop it. But for now prevent it from introducing gaps in the entire host CPU graph: if an exception escapes here, then nothing else gets reported, because the host CPU, VM CPU and hostload metrics all get returned as a single list. An exception escaping from any prevents all the others from working too. Fixes: 9aa7dfc ("CP-43574: Add host load data source") Signed-off-by: Edwin Török <edwin.torok@cloud.com>
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When this plugin was part of xcp-rrdd the shared memory protocol wasn't used for transfering data (it was transferred by direct function call). The shared memory protocol has a limitation that you need to declare a maximum size from the beginning, or carefully grow the file itself dynamically. We support max 1024 VMs/host, and if each one needs 5 pages, that'd be 20Mib/host, so always use that as the minimum number of pages. Fixes: b3ea092 ("IH-615: Move CPU-related data-source collection into a separate RRDD plugin") Signed-off-by: Edwin Török <edwin.torok@cloud.com>
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In fact 1 page / VM is not enough, a VM with 32 vCPUs needs a bit more than 2, so 64 should fit in 5. Still only 20MiB/host to avoid the bug. Even with these 2 fixes there are still occasional gaps in the CPU graphs, so there are likely more bugs in the CPU plugin (other plugins don't have the gaps). |
robhoes
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Apr 11, 2025
psafont
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Draft, because I still need to test it.