On Fr, 15.02.19 12:55, Zygmunt Krynicki (m...@zygoon.pl) wrote: > I’m happy to work on this issue once it becomes „pressing” and once > the prerequisites are available. If F30 disables v1 entirely and has > a kernel where we can get device, freezer and pid controllers then > it’s „just” a matter of coding.
The kernel will support both modes for a long time I figure. And so will systemd. You can switch between both modes at boot time through a kernel cmdline option, and the change for F30 would be to just default to a different setting. Note that in cgroupsv2 mode systemd will not mount the cgroupv1 hierchies at all. (You can mount them yourself if you want to though. For example, systemd-nspawn can optionally provide cgroupsv1 to container payloads on cgroupsv2 hosts, by simply mounting the name=systemd hierarchy into the container anyway) The "devices" cgroup controller is generally not available on cgroupsv2. However, there's now a set of bpf hook-ups that you can use instead and provide pretty much equivalent functionality. (systemd supports them already). The "freezer" cgroup controller is not available yet on cgroupsv2. But this is likely going to change soon, but it will be core cgroupsv2 functionality, not a controller of its own. Until the freezer becomes available it should be completely fine to simply use SIGSTOP instead, semantics are not thaaaaat different. The "pids" controllers has been available on cgroupsv2 since day one basically, at the same day it was introduced for cgroupsv1. Lennart -- Lennart Poettering, Red Hat _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org
