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/etc/systemd/swap.conf
/usr/lib/systemd/system/systemd-swap.service
/usr/bin/systemd-swap

# systemctl enable systemd-swap

$ git clone https://github.com/Nefelim4ag/systemd-swap.git
$ ./systemd-swap/package.sh debian
$ sudo dpkg -i ././systemd-swap/systemd-swap-*any.deb

$ git clone https://github.com/Nefelim4ag/systemd-swap.git
$ ./systemd-swap/package.sh fedora f28
$ sudo dnf install ./systemd-swap/systemd-swap-*noarch.rpm

$ git clone https://github.com/Nefelim4ag/systemd-swap.git
$ sudo make install

Q: WTF?! Why you merge swapFC and swapFU?
A: That simplify testing of swapFC code and make code more generic

Q: How can i migrate config swapFU from 3.X to 4.X?
A: Most of switches are same, to get configuration like swapFU from swapFC, set swapfc_max_count to 1 and swapfc_chunk_size to size of swapFU.

Q: Do we need to activate both zram and zswap?
A: Nope, it's useless, as zram is a compressed RAM DISK, but zswap is a compressed "writeback" CACHE on swap file/disk.

Q: Do i need use swapfc_force_use_loop on swapFC?
A: Nope, as you wish really, native swapfile must work faster and it's more safe in OOM condition in comparison to loop backed scenario.

Q: When would we want a certain configuration?
A: In most cases (Notebook, Desktop, Server) it's enough to enable zswap + swapfc (On server tuning of swapfc can be needed).
In case where SSD used, and you care about flash wear, use only ZRam.

Q: Where is the swap file located?
A: Read carefully swap.conf

Q: Can we use this to enable hibernation?
A: Nope as hibernation wants a persistent fs blocks and wants access to swap data directly from disk, this will not work on: zram, swapfu, swapfc (without some magic of course).

options zram max_devices=32