Re: [PATCH block/for-5.2-fixes] bfq: use io.weight interface file instead of io.bfq.weight

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> Il giorno 14 giu 2019, alle ore 22:22, Tejun Heo <tj@xxxxxxxxxx> ha scritto:
> 
> Hello,
> 
> On Thu, Jun 13, 2019 at 08:10:38AM +0200, Paolo Valente wrote:
>> BFQ does not implement weight_device, but we are not talking about
>> weight_device here.  More precisely, *nothing* implements weight_device
>> any longer in cgroups-v1, so the documentation is wrong altogether.
> 
> I can't see how renaming an interface file which has different
> behaviors on the same input to the same name is something acceptable.
> Imagine how confusing that'd be to userspace.  If you want to rename
> the control knob to io.weight, please implement full semantics for
> both cgroup1 and cgroup2.
> 

I want to, and I've tried to make it easier for you to point me to
what is missing exactly.  Once again, the only missing piece I see are
per-device weights.

> I just posted a separate io.weight implementation for cgroup2 but it's
> easy to provide a way to override the interface files when bfq gets
> selected, so let me know when you have a working implementation of the
> interface.
> 

Ok, thanks.  I'll ping you when also per-device weights are available
in BFQ's interface.

Thanks,
Paolo

> Thanks.
> 
> -- 
> tejun





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