linux-kernel - Re: [PATCHv1 0/6] rdma controller support

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Message-ID: <CAG53R5VYr6An5oh+RP2=pV_rDm793R5z+Tj6aRKNUZoTPJ3QCw@mail.gmail.com>
Date:	Fri, 8 Jan 2016 02:34:49 +0530
From:	Parav Pandit <pandit.parav@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
	lizefan@...wei.com, Johannes Weiner <hannes@...xchg.org>,
	Doug Ledford <dledford@...hat.com>,
	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>, raindel@...lanox.com,
	akpm@...ux-foundation.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCHv1 0/6] rdma controller support

On Fri, Jan 8, 2016 at 2:19 AM, Tejun Heo <tj@...nel.org> wrote:
> Hello, Parav.
>
> On Fri, Jan 08, 2016 at 02:16:59AM +0530, Parav Pandit wrote:
>> Let me think through it. Its been late night for me currently. So dont
>> want to conclude in hurry.
>
> Sure thing.
>
>> At high level it looks doable by maintaining hash table head on per
>> device basis, that further reduces hash contention by one level.
>> I will get back on this tomorrow.
>
> Hmmm... why would it need a hash table?  Let's say there's a struct
> rdma_device for each rdma_device and then that stuct can simply have
> rdma_device->res_table[] or whatever to track limits and consumptions
> and rdma_device->res_enabled mask to tell which resources are enabled
> on the device.
>

That table won't be sufficient, because rdma_device is shared among
multiple rdma_cgroups each such cgroup has different individual
resource limit and usage count. This is currently rpool structure.
For res_table[] needs to be per cgroup basis.


> Thanks.
>
> --
> tejun