systemd-oomd is now available in Ubuntu Jammy

[Lukas Märdian]

Hello folks,

After the enablement of systemd-oomd in Debian [0] we've now integrated 
the relevant changes into Ubuntu's systemd v249.9-0ubuntu2 package. 
sd-oomd is a userspace out-of-memory (OOM) killer, that utilizes 
systemd's unified cgroup hierarchy (cgroup v2, available as of Ubuntu 
Impish) to track resource usage of individual cgroups and kill them if 
they exceed their configured quotas [1]. That is before the kernel's OOM 
killer needs to kick in and while the system still is relatively responsive.

We're shipping a default configuration that uses a 
MemoryPressureDuration of 20sec and a MemoryPressureLimit of 50% for 
user sessions. sd-oomd can be enabled on your system by installing the 
"systemd-oomd" package:

sudo apt install systemd-oomd

For sd-oomd to work properly it needs to have some swap space available 
and applications will need to spawn processes into separate cgroups 
(e.g. with systemd-run) or use a desktop environment that does this for 
them.

I've proposed to enable systemd-oomd by default on Ubuntu Desktop [2], 
as GNOME is already prepared to launch applications in separate cgroups. 
I want to invite other Ubuntu flavors to check their corresponding 
(desktop-) environments for those prerequisites and enable sd-oomd in a 
similar way, by pulling in the "systemd-oomd" package.

Cheers,
    Lukas

[0] https://salsa.debian.org/systemd-team/systemd/-/merge_requests/133
[1] https://www.freedesktop.org/software/systemd/man/systemd-oomd.html
[2] 
https://code.launchpad.net/~slyon/ubuntu-seeds/+git/platform/+merge/414794
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