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

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Date:   Tue, 1 Nov 2022 19:32:45 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Yu Kuai <yukuai1@...weicloud.com>, tj@...nel.org, axboe@...nel.dk,
        paolo.valente@...aro.org, jack@...e.cz
Cc:     cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, yi.zhang@...wei.com,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [patch v11 0/6] support concurrent sync io for bfq on a specail
 occasion

Hi, Jens

在 2022/09/16 15:19, Yu Kuai 写道:
> From: Yu Kuai <yukuai3@...wei.com>
>
> 
> 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