Re: [patch v11 0/6] support concurrent sync io for bfq on a specail occasion

[Yu Kuai]

Hi, Jens

在 2022/09/16 15:19, Yu Kuai 写道:
> From: Yu Kuai <yukuai3@xxxxxxxxxx>
>
>
> Currently, bfq can't handle sync io concurrently as long as they
> are not issued from root group. This is because
> 'bfqd->num_groups_with_pending_reqs > 0' is always true in
> bfq_asymmetric_scenario().
>
> The way that bfqg is counted into 'num_groups_with_pending_reqs':
>
> Before this patchset:
>   1) root group will never be counted.
>   2) Count if bfqg or it's child bfqgs have pending requests.
>   3) Don't count if bfqg and it's child bfqgs complete all the requests.
>
> After this patchset:
>   1) root group is counted.
>   2) Count if bfqg has pending requests.
>   3) Don't count if bfqg complete all the requests.
>
> With the above changes, concurrent sync io can be supported if only
> one group is activated.

Can you apply this patchset?

Thanks,
Kuai