linux-kernel - Re: [PATCH -next 00/11] support concurrent sync io for bfq on a specail occasion

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Date:   Sat, 19 Mar 2022 10:34:53 +0800
From:   "yukuai (C)" <yukuai3@...wei.com>
To:     Paolo Valente <paolo.valente@...aro.org>
CC:     Tejun Heo <tj@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Jan Kara <jack@...e.cz>, <cgroups@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, <yi.zhang@...wei.com>
Subject: Re: [PATCH -next 00/11] support concurrent sync io for bfq on a
 specail occasion

在 2022/03/18 20:38, Paolo Valente 写道:
> Hi,
> could you please add pointers to the thread(s) where we have already revised this series (if we have). I don't see any reference to that in this cover letter.

Hi,

Ok, sorry for that, following is the previours threads.

This is a new patchset after RFC
- Fix some term in commit messages and comments
- Add some cleanup patches

New RFC: use a new solution, and it has little relevance to
previous versions.
https://lore.kernel.org/lkml/20211127101132.486806-1-yukuai3@huawei.com/T/
- as suggested by Paolo, count root group into
'num_groups_with_pending_reqs' instead of handling root group
separately.
- Change the patchset title
- New changes about when to modify 'num_groups_with_pending_reqs'

Orignal v4:
https://lore.kernel.org/lkml/20211014014556.3597008-2-yukuai3@huawei.com/t/
  - fix a compile warning when CONFIG_BLK_CGROUP is not enabled.

Orignal v3:
https://www.spinics.net/lists/linux-block/msg74836.html
  - Instead of tracking each queue in root group, tracking root group
  directly just like non-root group does.
  - remove patch 3,4 from these series.

Orignal v2:
https://lore.kernel.org/lkml/20210806020826.1407257-1-yukuai3@huawei.com/
- as suggested by Paolo, add support to track if root_group have any
  pending requests, and use that to handle the situation when only one
  group is activated while root group doesn't have any pending requests.
  - modify commit message in patch 2