linux-kernel - Re: RFC [patch] sched,cgroup_sched: convince RT_GROUP

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Date:	Wed, 18 Apr 2012 08:27:50 +0200
From:	Mike Galbraith <efault@....de>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: RFC [patch] sched,cgroup_sched: convince RT_GROUP_SCHED
 throttle to work

On Wed, 2012-04-18 at 13:20 +0800, Yong Zhang wrote:

> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -5875,6 +5875,11 @@ cpu_attach_domain(struct sched_domain *s
> >  			sd->child = NULL;
> >  	}
> >  
> > +	if (sd)
> > +		cpumask_clear_cpu(cpu, cpu_isolated_map);
> > +	else
> > +		cpumask_set_cpu(cpu, cpu_isolated_map);
> > +
> 
> Do we allow this?

Yeah, isolating CPUS 2-3...

[ 3011.444345] CPU0 attaching NULL sched-domain.
[ 3011.448719] CPU1 attaching NULL sched-domain.
[ 3011.453107] CPU2 attaching NULL sched-domain.
[ 3011.457466] CPU3 attaching NULL sched-domain.
[ 3011.461892] CPU0 attaching sched-domain:
[ 3011.465813]  domain 0: span 0-1 level MC
[ 3011.469761]   groups: 0 1
[ 3011.472415] CPU1 attaching sched-domain:
[ 3011.476333]  domain 0: span 0-1 level MC
[ 3011.480266]   groups: 1 0
[ 3011.482988] CPU2 attaching sched-domain:
[ 3011.486919]  domain 0: span 2-3 level MC
[ 3011.490851]   groups: 2 3
[ 3011.493502] CPU3 attaching sched-domain:
[ 3011.497422]  domain 0: span 2-3 level MC
[ 3011.501367]   groups: 3 2
[ 3011.504214] CPU2 attaching NULL sched-domain.
[ 3011.508569] CPU3 attaching NULL sched-domain.


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