W dniu 6.06.2022 o 16:02, Michal Koutný pisze:
Hello Michał. On Sun, Jun 05, 2022 at 03:28:23PM +0200, Michał Zegan <webczat@xxxxxxxxxxx> wrote:I have kernel 5.17 on archlinux.How is your kernel configured wrt CONFIG_RT_GROUP_SCHED?
it is unset
this note pointed to in the readme is quite cgroups v1 specific, I believe what it describes was true in v1, and v2 does not have any capability to control realtime processes in non root cgroups if I read correctly.Is that still true?That depends :-)Yet, checking /proc/(pid)/cgroup states these processes are not in a root cgroup, yet the cpu controller is enabled on the root cgroup (/sys/fs/cgroup/cgroup.subtree_control lists "cpu" as one of the controllers and I see the interface files in children). Can anyone explain the situation?With v2 and CONFIG_RT_GROUP_SCHED there's no way how to assign realtime budgets to cgroups and therefore realtime tasks cannot run in them. With !CONFIG_RT_GROUP_SCHED, there's (internally) only the root cgroup for realtime tasks and things apparently work. See also [1].
<snip> The cgroupsv2 documentation states that cgroup cpu controller currently does not support realtime processes, so to enable it all realtime processes must be moved to root cgroup.Will you send a docs patch with the CONFIG_RT_GROUP_SCHED reservation? :-p HTH, Michal [1] https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fsystemd%2Fsystemd%2Fblob%2F369151c9c73b12fb7a88fc2b558499c2d4832982%2FREADME%23L140&data=05%7C01%7C%7C2497332c429b4459b16308da47c5367e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637901209614621463%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=dXYxa0cDT48qoJDUwJKA%2B2d7vBLYxdc1TuZztaQqQWI%3D&reserved=0
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