linux-kernel - Re: [PATCHv10 1/3] rdmacg: Added rdma cgroup controller

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Date:	Tue, 5 Apr 2016 18:44:23 +0300
From:	Leon Romanovsky <leon@...n.nu>
To:	Parav Pandit <pandit.parav@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>, Tejun Heo <tj@...nel.org>,
	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>, akpm@...ux-foundation.org,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCHv10 1/3] rdmacg: Added rdma cgroup controller

On Tue, Apr 05, 2016 at 05:55:26AM -0700, Parav Pandit wrote:
> Hi Christoph,
> 
> On Tue, Apr 5, 2016 at 5:42 AM, Christoph Hellwig <hch@...radead.org> wrote:
> > On Tue, Apr 05, 2016 at 05:39:21AM -0700, Parav Pandit wrote:
> >> I am not really trying to address OFED issues here. I am sure you
> >> understand that if ib_core.ko kernel module is in-kernel module than,
> >> for all the fixes/enhancements that goes to it would require people to
> >> upgrade to newer kernel, instead of just modules upgrade. Such heavy
> >> weight upgrade slows down the adoption which i am trying to avoid here
> >> by placing knobs in right kernel module's hand.
> >
> > What a load of rubbish.  The Linux kernel is one program and should be
> > upgraded together.
> 
> Just because we add one more rdma resource, we need to ask someone to
> upgrade kernel?

It doesn't make sense. Kernel and modules are always coming together,
the attempts to mix kernel and modules from different versions can lead
to many interesting debug scenarios.