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ryan4yin | 二花 12505b415c refactor(kubevirt): memory tuning - drop static hugepages, add zram + earlyoom (#280 )

* refactor(kubevirt): drop the static 1G hugetlb pool, use THP on demand

The hosts pre-reserved 48/48/15 GiB of 1G hugepages, but the VMs only used 32/16/11 GiB, so ~52 GiB was stranded (hugetlb is exclusive and cannot be overcommitted or shared with the host / non-hugepage VMs). It also blocked scheduling (a 16 GiB hugepage VM cannot fit on a host with fewer free pages, e.g. youko with 15/24 GiB) and made the full intended VM set (idols 3x8G + k3s-test 3x16G + k3s-prod 3x4G + 3x16G = 132 GiB vs 146 GiB physical) impossible to fit.

Use transparent huge pages on demand (madvise) instead, and let the VMs use ordinary memory (instancetypes updated in k8s-gitops). This frees the stranded memory, removes the scheduling rigidity, and makes overcommit/swap usable again.

* feat(kubevirt): add earlyoom; stop overriding swappiness (zram already enabled)

zram is already provided by modules/nixos/base/zram.nix (enabled by default: 50% RAM, zstd, prio 100 + swappiness/watermark tunings). But genKubeVirtHostModule hard-coded vm.swappiness = 0, which overrode the modules mkDefault 180 and disabled swapping entirely - so the zram device was never used (Swap used: 0B).

- Remove the hard-coded vm.swappiness (let the zram modules tuning apply); the disk swapfile from disko stays as the last resort.
- Add services.earlyoom to kill the greediest process before the host thrashes / OOMs.

2026-09-21 01:39:51 +08:00

attrs.nix

feat: format via 'ls **/*.nix | each { |it| nixfmt $it.name }'

2025-07-30 12:17:24 +08:00

colmenaSystem.nix

feat: format via 'ls **/*.nix | each { |it| nixfmt $it.name }'

2025-07-30 12:17:24 +08:00

default.nix

feat: format via 'ls **/*.nix | each { |it| nixfmt $it.name }'

2025-07-30 12:17:24 +08:00

genK3sAgentModule.nix

feat: format via 'ls **/*.nix | each { |it| nixfmt $it.name }'