Based on what you stated, I assume this VPS is running on OpenVZ? If so, I doubt it will ever see newer kernel features, in part due to OpenVZ hosts relying on ancient LTS kernel branches and also due to OpenVZ "optimizations", whereby kernel features that use extra resources to enable just get disabled. Or, if your lucky they'll give you a button to re-enable them for youe container on an ad-hoc basis.

Heads up, $20 yearly and similar KVM deals are becoming more common, and you can run any kernel you want in KVM :P

Where do you get these $20/y deals?

Here is a KVM VPS with a gig of ram for $15: https://www.lowendtalk.com/discussion/150797/virmach-raid-10...

Lots of offers on lowendtalk.com. Not all equally reliable.

Arubacloud is pretty good, but €1 offer is only available in Italy.

Besides that RamNode, BuyVM, Hetzner and Ultravps are pretty good (though all a bit more expensive than 20$/year).

arubacloud.com has KVM based VPSes starting at 1€/month.

https://www.arubacloud.com/vps/virtual-private-server-range.... says "based on VMware technology". Doesn't sound like KVM.

Nothing between small and medium, with 2 to 3 Gb RAM?

find a VPS provider that supports using KVM properly as a hypervisor. Vultr is a good one to look at first.