linux-kernel - Re: [PATCH RFC - TAKE TWO - 02/12] block, bfq: add full hierarchical scheduling and cgroups support

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Date:	Fri, 30 May 2014 23:49:18 +0200
From:	Paolo Valente <paolo.valente@...more.it>
To:	Tejun Heo <tj@...nel.org>
Cc:	Jens Axboe <axboe@...nel.dk>, Li Zefan <lizefan@...wei.com>,
	Fabio Checconi <fchecconi@...il.com>,
	Arianna Avanzini <avanzini.arianna@...il.com>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org
Subject: Re: [PATCH RFC - TAKE TWO - 02/12] block, bfq: add full hierarchical scheduling and cgroups support


Il giorno 30/mag/2014, alle ore 17:37, Tejun Heo <tj@...nel.org> ha scritto:

> On Thu, May 29, 2014 at 11:05:33AM +0200, Paolo Valente wrote:
>> diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
>> index 768fe44..cdd2528 100644
>> --- a/include/linux/cgroup_subsys.h
>> +++ b/include/linux/cgroup_subsys.h
>> @@ -39,6 +39,10 @@ SUBSYS(net_cls)
>> SUBSYS(blkio)
>> #endif
>> 
>> +#if IS_ENABLED(CONFIG_CGROUP_BFQIO)
>> +SUBSYS(bfqio)
>> +#endif
> 
> So, ummm, I don't think this is a good idea.  Why aren't you plugging
> into the blkcg infrastructure as cfq does?  Why does it need to be a
> separate controller?
> 

It does not, actually. It is just that when we implemented that part, there was no blkcg infrastructure. After that, I have gone on experimenting with the low-latency heuristics and all the other stuff. Finally I have decided to first propose this new version of bfq, and then deal also with blkcg integration in case of a positive welcome.

Thanks,
Paolo

> Thanks.
> 
> -- 
> tejun


--
Paolo Valente                                                 
Algogroup
Dipartimento di Fisica, Informatica e Matematica		
Via Campi, 213/B
41125 Modena - Italy        				  
homepage:  http://algogroup.unimore.it/people/paolo/

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