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

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Message-ID: <20160107200604.GE1898@mtj.duckdns.org>
Date:	Thu, 7 Jan 2016 15:06:04 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Parav Pandit <pandit.parav@...il.com>
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

Hello,

On Fri, Jan 08, 2016 at 01:31:06AM +0530, Parav Pandit wrote:
> >  What I was
> > trying to say was that unless the number is extremely high, it'd be
> > far simpler to hard code them in the rdma controller and let drivers
> > enable the ones which apply to them.
> 
> Instead of in rdma controller, its hard coded in IB stack.
> I see this as an advantage where resource definition ownership remains
> with IB stack maintainers, rather than rdma cgroup maintainer.
> rdma cgroup maintainer doesn't have to understand what SRQ vs QP or
> ODP type MR or multicast group is.
> IB stack maintainer is better placed to judge and define it.
> 
> I would like to hear from Jason, Doug, Liran and other RDMA experts
> about their thoughts.

That's fine.  Make it a header file in IB stack which is included from
the rdma cgroup controller.  The only things are not building a huge
dynamic framework for something which can easily be a simple static
thing and having some oversight in adding resource types.

Thanks.

-- 
tejun