Script to manage swap on:
- zswap - Enable/Configure
- zram - Autoconfigurating for swap
- files - (sparse files for saving space, supports btrfs)
- block devices - auto find and do swapon
ℹ️ It is configurable in /etc/systemd/swap.conf
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Additional terms:
- SwapFC (File Chunked) - provides a dynamic swap file allocation/deallocation
/etc/systemd/swap.conf
/usr/lib/systemd/system/systemd-swap.service
/usr/bin/systemd-swap
sudo systemctl enable --now systemd-swap
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Arch: in the community.
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git clone --depth=1 https://github.com/Nefelim4ag/systemd-swap.git cd systemd-swap make deb sudo dpkg -i systemd-swap_*_all.deb
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git clone --depth=1 https://github.com/Nefelim4ag/systemd-swap.git cd systemd-swap FEDORA_VERSION=f32 make rpm sudo rpm -U systemd-swap-*noarch.rpm
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git clone --depth=1 https://github.com/Nefelim4ag/systemd-swap.git ./systemd-swap/package.sh centos sudo rpm -U ./systemd-swap/systemd-swap-*noarch.rpm
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Manual
git clone --depth=1 https://github.com/Nefelim4ag/systemd-swap.git sudo make install # or into /usr/local: sudo make prefix=/usr/local install
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. Also having both activated can lead to inverse LRU as noted here
Q: Do I need to use swapfc_force_use_loop
on swapFC?
A: Nope, as you wish really, native swapfile should work faster and it's safer 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). If you use a SSD and care about flash memory wear, use only ZRam.
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: swapfc (without some magic of course, see #85).
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ℹ️ Zram dependence: util-linux >= 2.26
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ℹ️ If you use zram not for swap only, use kernel 4.2+ or please add rule for modprobe like:
options zram max_devices=32
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Enable swapfc if wanted (note, you should never use zram and zswap at the same time, read more here)
vim /etc/systemd/swap.conf
zram_enabled=0 zswap_enabled=1 swapfc_enabled=1
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Stop any external swap:
sudo swapoff -a
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Remove swap entry from fstab:
vim /etc/fstab
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Remove your swap
# For Ubuntu sudo rm -f /swapfile # For Centos 7 (if using a swap partition and lvm) lvremove -Ay /dev/centos/swap lvextend -l +100%FREE centos/root
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Remove swap from Grub:
# For Ubuntu remove resume* in grub vim /etc/default/grub # For Centos 7 remove rd.lvm.lv=centos/swap* vim /etc/default/grub # For Manjaro remove resume* in grub & mkinitcpio vim /etc/default/grub vim /etc/mkinitcpio.conf
# For Ubuntu update-grub # For Centos 7 grub2-mkconfig -o /boot/grub2/grub.cfg # For Manjaro update-grub mkinitcpio -P