Messages in this thread | | | Subject | Re: [PATCH] sched: Relax a restriction in sched_rt_can_attach() | From | Mike Galbraith <> | Date | Mon, 04 May 2015 05:13:56 +0200 |
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On Mon, 2015-05-04 at 08:54 +0800, Zefan Li wrote: > It's allowed to promote a task from normal to realtime after it has been > attached to a non-root cgroup, but it will fail if the attaching happens > after it has become realtime. I don't see how this restriction is useful.
In the CONFIG_RT_GROUP_SCHED case, promotion will fail is there is no bandwidth allocated.
> We are moving toward unified hierarchy where all the cgroup controllers > are bound together, so it would make cgroups easier to use if we have less > restrictions on attaching tasks between cgroups.
Forcing group scheduling overhead on users if they want cpuset or memory cgroup functionality would be far from wonderful. Am I interpreting the implications of this unification/binding properly?
(I hope not, surely the plan is not to utterly _destroy_ cgroup utility)
-Mike
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