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Re: [PATCH] cgroups: move cpuset specific checks from generic code to cpuset_can_attach (v2)

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  Re: [PATCH] cgroups: move cpuset specific checks from generic code  to cpuset_can_attach (v2) Tejun Heo <tj@kernel.org> - 2015-12-01 17:50 +0100
    Re: [PATCH] cgroups: move cpuset specific checks from generic code  to cpuset_can_attach (v2) Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-12-02 07:30 +0100

#1281036 — Re: [PATCH] cgroups: move cpuset specific checks from generic code to cpuset_can_attach (v2)

On Thu, Nov 26, 2015 at 08:32:32PM -0200, Marcelo Tosatti wrote:
> 
> Move PF_NO_SETAFFINITY and kthreadd_task checks to cpuset cgroups,  
> where they belong. This makes it possible to attach PF_NO_SETAFFINITY 
> tasks to Intel CAT cgroup.
> 
> Reported-by: Luiz Capitulino <lcapitulino@redhat.com>
> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
> Reviewed-by: Chao Peng <chao.p.peng@linux.intel.com>
> 
> v2: "PF_NO_SETAFFINITY check" -> "PF_NO_SETAFFINITY and kthreadd_task
> checks"

This wasn't just for cpuset.  It's for all controllers.

Thanks.

-- 
tejun
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#1281485

On Tue, 2015-12-01 at 11:49 -0500, Tejun Heo wrote:
> On Thu, Nov 26, 2015 at 08:32:32PM -0200, Marcelo Tosatti wrote:
> > 
> > Move PF_NO_SETAFFINITY and kthreadd_task checks to cpuset cgroups,  
> > where they belong. This makes it possible to attach PF_NO_SETAFFINITY 
> > tasks to Intel CAT cgroup.
> > 
> > Reported-by: Luiz Capitulino <lcapitulino@redhat.com>
> > Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
> > Reviewed-by: Chao Peng <chao.p.peng@linux.intel.com>
> > 
> > v2: "PF_NO_SETAFFINITY check" -> "PF_NO_SETAFFINITY and kthreadd_task
> > checks"
> 
> This wasn't just for cpuset.  It's for all controllers.

Hm, indeed.  Workers landing in a throttled cfs rq wouldn't be as
painful as an rt worker being born in an rq with no rt_runtime, but
could sting.  Workers stuffed into the freezer would sting mightily.

	-Mike

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