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SubjectRe: [PATCH 12/14] sched: make dl_bw a sub-quota of rt_bw
On 10/14/2013 04:06 PM, Ingo Molnar wrote:
>
> * Juri Lelli <juri.lelli@gmail.com> wrote:
>
>> +#ifdef CONFIG_SMP
>> + struct dl_bw *dl_b = &cpu_rq(i)->rd->dl_bw;
>> +#else
>> + struct dl_bw *dl_b = &cpu_rq(i)->dl.dl_bw;
>> +#endif
>
>> +#ifdef CONFIG_SMP
>> + struct dl_bw *dl_b = &cpu_rq(i)->rd->dl_bw;
>> +#else
>> + struct dl_bw *dl_b = &cpu_rq(i)->dl.dl_bw;
>> +#endif
>
> Btw., this kind of SMP/UP assymetry pattern really sucks. Why not make UP
> use the SMP data structure, even if it's degenerate?
>

Yes, I don't like it either, but that comes from the fact that it seemed to me
that, semantically, bandwidth for -deadline tasks has to be associated to the
single runqueue in UP and to the root_domain for SMP. In UP root_domain is
compiled out, so I'm not sure to understand what you suggest. I could probably
let dl_bw live on runqueues with the assumption that all the runqueues from the
same root_domain have the same dl_bw, that represents the dl_bw of the
root_domain. But I don't like this replication either :(.

Thanks,

- Juri


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