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SubjectRe: 2.6.28 has unconfigurable group sched?
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On Wed, 2009-01-14 at 06:46 -0800, Mark Glines wrote:
> Peter Zijlstra wrote:
> >> So it seems rt_schedulable() is never succeeding. Any ideas?
> >
> > Yeah, I should test this user grouping stuff more often :/
> >
> > The below fixes it for me.
> > ---
> > Subject: sched: fix bandwidth validation for UID grouping
> >
> > For UID grouping we initialize the root group with infinite bandwidth
> > which by default is actually more than the global limit, therefore the
> > bandwidth check always fails.
> >
> > Because the root group is a phantom group (for UID grouping) we cannot
> > runtime adjust it, therefore we let it reflect the global bandwidth
> > settings.
>
>
> Thanks. Sadly, this doesn't seem to change anything for me. I applied
> it to 2.6.28, rebuilt and reinstalled, and got the same result. I did a
> clean rebuild to be sure; and got the same behavior again.
>
> Please let me know if there are any additional diagnostics I can provide.

Most strange, I did the patch on .28 just to be sure (my initial testing
was done on -linus since I couldn't remember it having changed in a
while), and it still works for me.

CONFIG_GROUP_SCHED=y
CONFIG_FAIR_GROUP_SCHED=y
CONFIG_RT_GROUP_SCHED=y
CONFIG_USER_SCHED=y
# CONFIG_CGROUP_SCHED is not set

Linux opteron 2.6.28 #634 SMP PREEMPT Wed Jan 14 18:13:31 CET 2009
x86_64 x86_64 x86_64 GNU/Linux

# echo 450000 > /sys/kernel/uids/0/cpu_rt_runtime
# cat /sys/kernel/uids/0/cpu_rt_runtime
450000



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