Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy

From: Tejun Heo
Date: Mon Aug 24 2015 - 17:02:31 EST


Hello,

On Mon, Aug 24, 2015 at 01:54:08PM -0700, Paul Turner wrote:
> > That alone doesn't require hierarchical resource distribution tho.
> > Setting nice levels reasonably is likely to alleviate most of the
> > problem.
>
> Nice is not sufficient here. There could be arbitrarily many threads
> within the hypervisor that are not actually hosting guest CPU threads.
> The only way to have this competition occur at a reasonably fixed
> ratio is a sub-hierarchy.

I get that having hierarchy of threads would be nicer but am having a
bit of difficulty seeing why adjusting priorities of threads wouldn't
be sufficient. It's not like threads of the same process competing
with each other is a new problem. People have been dealing with it
for ages. Hierarchical management can be a nice plus but we want the
problem and proposed solution to be justifiable.

Thanks.

--
tejun
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