linux-kernel - Re: [PATCH 0/5] blkcg: Limit maximum number of aio requests available for cgroup

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Date:   Mon, 04 Dec 2017 16:35:23 -0500
From:   Jeff Moyer <jmoyer@...hat.com>
To:     Kirill Tkhai <ktkhai@...tuozzo.com>
Cc:     Benjamin LaHaise <ben@...munityfibre.ca>, axboe@...nel.dk,
        viro@...iv.linux.org.uk, tj@...nel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-aio@...ck.org, oleg@...hat.com
Subject: Re: [PATCH 0/5] blkcg: Limit maximum number of aio requests available for cgroup

Kirill Tkhai <ktkhai@...tuozzo.com> writes:

> Hi, Benjamin,
>
> On 04.12.2017 19:52, Benjamin LaHaise wrote:
>> Hi Kirill,
>> 
>> On Mon, Dec 04, 2017 at 07:12:51PM +0300, Kirill Tkhai wrote:
>>> Hi,
>>>
>>> this patch set introduces accounting aio_nr and aio_max_nr per blkio cgroup.
>>> It may be used to limit number of aio requests, which are available for
>>> a cgroup, and could be useful for containers.
>>>
>>> The accounting is hierarchical, and aio contexts, allocated in child cgroup,
>>> are accounted in parent cgroups too.
>>>
>>> Also, new cgroup file "io.aio_nr" is introduced. It's used to set cgroup
>>> aio requests limit, to show current limit and number of currenly occupied
>>> requests.
>> 
>> Where are your test cases to check this functionality in the libaio test
>> suite?
>
> I tried to find actual libaio test suite repository url in google,
> but there is no certain answer. Also, there is no information in kernel
> anywhere (I hope I grepped right).
>
> Could you please provide url where actual upstream libaio could be obtained?

https://pagure.io/libaio

Patches can be sent to this list (linux-aio).

Cheers,
Jeff

>>> Patches 1-3 are refactoring.
>>> Patch 4 is the place where the accounting actually introduced.
>>> Patch 5 adds "io.aio_nr" file.
>>>
>>> ---
>>>
>>> Kirill Tkhai (5):
>>>       aio: Move aio_nr increment to separate function
>>>       aio: Export aio_nr_lock and aio_max_nr initial value to include/linux/aio.h
>>>       blkcg: Add blkcg::blkg_aio_nr and blkcg::blkg_aio_max_nr
>>>       blkcg: Charge aio requests in blkio cgroup hierarchy
>>>       blkcg: Add cgroup file to configure blkcg::blkg_aio_max_nr
>>>
>>>
>>>  block/blk-cgroup.c         |   88 +++++++++++++++++++++++++-
>>>  fs/aio.c                   |  151 ++++++++++++++++++++++++++++++++++++++++----
>>>  include/linux/aio.h        |   21 ++++++
>>>  include/linux/blk-cgroup.h |    4 +
>>>  4 files changed, 247 insertions(+), 17 deletions(-)
>>>
>>> --
>>> Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
>>>
>> 
>
> --
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