linux-kernel - Re: [PATCHv12 1/3] rdmacg: Added rdma cgroup controller

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Message-ID: <CAG53R5XZRtG4BeLv9wdLB4wW4iDLnEPHeoynaTPi_Sp6ht_3fA@mail.gmail.com>
Date:   Mon, 19 Sep 2016 22:30:15 +0530
From:   Parav Pandit <pandit.parav@...il.com>
To:     "Dalessandro, Dennis" <dennis.dalessandro@...el.com>
Cc:     "leon@...nel.org" <leon@...nel.org>,
        "lizefan@...wei.com" <lizefan@...wei.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "corbet@....net" <corbet@....net>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "ogerlitz@...lanox.com" <ogerlitz@...lanox.com>,
        "hch@....de" <hch@....de>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "haggaie@...lanox.com" <haggaie@...lanox.com>,
        "hannes@...xchg.org" <hannes@...xchg.org>,
        "Hefty, Sean" <sean.hefty@...el.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "james.l.morris@...cle.com" <james.l.morris@...cle.com>,
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        "serge@...lyn.com" <serge@...lyn.com>
Subject: Re: [PATCHv12 1/3] rdmacg: Added rdma cgroup controller

Hi Denny,

On Mon, Sep 19, 2016 at 6:40 PM, Dalessandro, Dennis
<dennis.dalessandro@...el.com> wrote:
> On Wed, 2016-09-14 at 12:36 +0530, Parav Pandit wrote:
>> Hi Dennis,
>>
>> Do you know how would HFI1 driver would work along with rdma cgroup?
>
> Keep in mind HFI1 driver has two "modes" of operation. We support
> verbs, and would surely fall in line with whatever cgroups do for IB
> core.
Thanks for the feedback.

> For our psm interface, not sure how cgroups would come into play.
> Psm is designed to expose the hw to user and avoid the kernel when
> possible adding more kernel control is sort of contrary to that.
>
Yes, PSM is currently out of RDMA cgroup and in future we can take a
look on how things shape as subsystem if it does.

> Now that being said, Christoph recently made mention of maybe having a
> drivers/psm [1]. I really haven't had a chance to think about the
> implications of that, but maybe it's worth considering, after all we
> have two implementations, qib and hfi1. So anyway I'm not sure we need
> to be too concerned about cgroups right now as far as psm side of
> things goes.
>
o.k.