Re: [PATCHSET cgroup/for-3.15] cgroup: implement unified hierarchy

[Raghavendra KT]

On 5/2/14, Tejun Heo <tj@xxxxxxxxxx> wrote:
> Hello,
>
> On Wed, Apr 30, 2014 at 04:27:51PM +0530, Raghavendra KT wrote:
[...]
>> Because all the way along, though we have freedom to make the cpusets
>> exclusive and move tasks (say VMs) into them,
>> making sure they do not interfere with each other, we can not prevent
>> the other tasks spawned in a system eating into cpus of
>> exclusive cpuset since they go to root automatically.
>
> I believe the right thing to do would be starting / confining other
> tasks in the appropriate non-root cgroups.  cgroup already provides
> mechanisms to achieve that.  The rest is upto userland.
>

Thanks Tejun for the reply. I agree.

>> Do you think having a knob, to make sure new tasks spawned go to say a
>> default  directory under root makes sense?
>>
>>  I understand that we could easily have a userspace script which could
>> achieve intended goal, but kernel solution
>>  would really make the exclusive cpusets have exclusive access to cpus
>> it should have.
>
> This would just be a more reliable implementation of an ad-hoc
> mechanism when it can already be properly achieved by managing cgroups
> of all processes in the system.

Correct. Perhaps your answer clears my dilemma to go for a userspace
since I donot have any strong reason except convenience to go for a
kernel solution.
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