Messages in this thread | | | Date | Tue, 5 May 2015 11:46:00 +0800 | From | Zefan Li <> | Subject | Re: [PATCH] sched: Relax a restriction in sched_rt_can_attach() |
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On 2015/5/4 22:09, Mike Galbraith wrote: > On Mon, 2015-05-04 at 14:37 +0200, Peter Zijlstra wrote: >> On Mon, May 04, 2015 at 05:11:10PM +0800, Zefan Li wrote: >> >>> Some degree of flexibility is provided so that you may disable some controllers >>> in a subtree. For example: >>> >>> root ---> child1 >>> (cpuset,memory,cpu) (cpuset,memory) >>> \ >>> \-> child2 >>> (cpu) >> >> Uhm, how does that work? Would a task their effective cgroup be the >> first parent that has a controller enabled? >> >> In particular, in your example, if T were part of child1, would its cpu >> controller be root?
correct.
> > That's what I'd hope for. I wanted to try that cgroup.subtree_control > gizmo to see for myself, but I don't have one, and probably won't get > one until I introduce systemd to my axe (again, it's a slow learner). >
I'm testing in an environment without systemd.
You need to mount cgroup with a special option:
# mount -t cgroup -o __DEVEL__sane_behavior xxx /where
If a cgroup controller has already been mounted without this option, you won't see it in the unified hierarchy, so firstly you need to delete all cgroups in it and umount it.
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