linux-kernel - Re: 2.6.28 has unconfigurable group sched?

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Date:	Thu, 15 Jan 2009 08:29:04 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mark Glines <mark@...nes.org>
Cc:	Ingo Molnar <mingo@...e.hu>, L-K <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.28 has unconfigurable group sched?

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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