Anita Zhang
59331b8e29
There may be situations where a cgroup should be protected from killing or deprioritized as a candidate. In FB oomd xattrs are used to bias oomd away from supervisor cgroups and towards worker cgroups in container tasks. On desktops this can be used to protect important units with unpredictable resource consumption. The patch allows systemd-oomd to understand 2 xattrs: "user.oomd_avoid" and "user.oomd_omit". If systemd-oomd sees these xattrs set to 1 on a candidate cgroup (i.e. while attempting to kill something) AND the cgroup is owned by root, it will either deprioritize the cgroup as a candidate (avoid) or remove it completely as a candidate (omit). Usage is restricted to root owned cgroups to prevent situations where an unprivileged user can set their own cgroups lower in the kill priority than another user's (and prevent them from omitting their units from systemd-oomd killing).
System and Service Manager
Details
Most documentation is available on systemd's web site.
Assorted, older, general information about systemd can be found in the systemd Wiki.
Information about build requirements is provided in the README file.
Consult our NEWS file for information about what's new in the most recent systemd versions.
Please see the Hacking guide for information on how to hack on systemd and test your modifications.
Please see our Contribution Guidelines for more information about filing GitHub Issues and posting GitHub Pull Requests.
When preparing patches for systemd, please follow our Coding Style Guidelines.
If you are looking for support, please contact our mailing list or join our IRC channel.
Stable branches with backported patches are available in the stable repo.