Re: [PATCH v4] cpuset: Enable cpuset controller in default hierarchy

[Waiman Long]

On 03/09/2018 05:17 PM, Peter Zijlstra wrote:
> On Fri, Mar 09, 2018 at 03:43:34PM -0500, Waiman Long wrote:
>> The isolcpus= parameter just reduce the cpus available to the rests of
>> the system. The cpuset controller does look at that value and make
>> adjustment accordingly, but it has no dependence on exclusive cpu/mem
>> features of cpuset.
> The isolcpus= boot param is donkey shit and needs to die. cpuset _used_
> to be able to fully replace it, but with the advent of cgroup 'feature'
> this got lost.
>
> And instead of fixing it, you're making it _far_ worse. You completely
> removed all the bits that allow repartitioning the scheduler domains.
>
> Mike is completely right, full NAK on any such approach.

So you are talking about sched_relax_domain_level and
sched_load_balance. I have not removed any bits. I just haven't exposed
them yet. It does seem like these 2 control knobs are useful from the
scheduling perspective. Do we also need cpu_exclusive or just the two
sched control knobs are enough?

Cheers,
Longman