> VMs are the only reason I sometimes struggle with 32GB, It's always annoyed me that the memory allocation for VMs is so static. If I allocate 16GB to a VM, i

> VMs are the only reason I sometimes struggle with 32GB, It's always annoyed me that the memory allocation for VMs is so static. If I allocate 16GB to a VM, it will fill these 16GB with its own filesystem cache, even when the host could make a better use of that memory (like using it for other VMs). There's virtio-balloon, but it has to be adjusted manually.