linux-kernel - Re: [PATCHv12 0/3] rdmacg: IB/core: rdma controller support

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Date:   Thu, 6 Oct 2016 18:29:54 +0530
From:   Parav Pandit <pandit.parav@...il.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-rdma@...r.kernel.org, Tejun Heo <tj@...nel.org>,
        Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Doug Ledford <dledford@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Liran Liss <liranl@...lanox.com>,
        "Hefty, Sean" <sean.hefty@...el.com>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Haggai Eran <haggaie@...lanox.com>,
        Jonathan Corbet <corbet@....net>, james.l.morris@...cle.com,
        serge@...lyn.com, Or Gerlitz <ogerlitz@...lanox.com>,
        Matan Barak <matanb@...lanox.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCHv12 0/3] rdmacg: IB/core: rdma controller support

Hi Leon,

On Wed, Oct 5, 2016 at 4:52 PM, Leon Romanovsky <leon@...nel.org> wrote:
> On Wed, Aug 31, 2016 at 02:07:24PM +0530, Parav Pandit wrote:
>> rdmacg: IB/core: rdma controller support
>>
>> Patch is generated and tested against below Doug's linux-rdma
>> git tree.
>>
>> URL: git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma.git
>> Branch: master
>>
>> Patchset is also compiled and tested against below Tejun's cgroup tree
>> using cgroup v2 mode.
>> URL: git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git
>> Branch: master
>>
>> Overview:
>> Currently user space applications can easily take away all the rdma
>> device specific resources such as AH, CQ, QP, MR etc. Due to which other
>> applications in other cgroup or kernel space ULPs may not even get chance
>> to allocate any rdma resources. This results into service unavailibility.
>>
>> RDMA cgroup addresses this issue by allowing resource accounting,
>> limit enforcement on per cgroup, per rdma device basis.
>>
>> RDMA uverbs layer will enforce limits on well defined RDMA verb
>> resources without any HCA vendor device driver involvement.
>>
>> RDMA uverbs layer will not do limit enforcement of HCA hw vendor
>> specific resources. Instead rdma cgroup provides set of APIs
>> through which vendor specific drivers can do resource accounting
>> by making use of rdma cgroup.
>
> Hi Parav,
> I want to propose an extension to the RDMA cgroup which can be done as
> follow-up patches.
>

To bring logical end to this feature/patch discussion and to progress
towards merging it, Lets discuss this new feature in follow-on email
right after this email between these two mailing list and I will drop
linux kernel and docs mailing list.

> Let's add new global type, which will control whole HCA (for example in percentages). It will
> allow natively define new objects without need to introduce them to the user.
>
> This HCA share will be overwritten by specific UVERBS types which you
> already defined.
>
> What do you think?
>
> Except this proposal,
> Reviewed-by: Leon Romanovsky <leonro@...lanox.com>

Thanks a lot for review.

Parav