linux-kernel - Re: RFC rdma cgroup

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Message-ID: <CAG53R5X4wD1G4wB5vETMmVTc3XzatkEy3zamiTiVZ36dVYDAqQ@mail.gmail.com>
Date:	Wed, 4 Nov 2015 22:53:36 +0530
From:	Parav Pandit <pandit.parav@...il.com>
To:	Haggai Eran <haggaie@...lanox.com>
Cc:	Tejun Heo <tj@...nel.org>, Doug Ledford <dledford@...hat.com>,
	"Hefty, Sean" <sean.hefty@...el.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	Liran Liss <liranl@...lanox.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lizefan@...wei.com" <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Jonathan Corbet <corbet@....net>,
	"james.l.morris@...cle.com" <james.l.morris@...cle.com>,
	"serge@...lyn.com" <serge@...lyn.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Matan Barak <matanb@...lanox.com>,
	"raindel@...lanox.com" <raindel@...lanox.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-security-module@...r.kernel.org" 
	<linux-security-module@...r.kernel.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Subject: Re: RFC rdma cgroup

On Wed, Nov 4, 2015 at 5:28 PM, Haggai Eran <haggaie@...lanox.com> wrote:
> On 03/11/2015 21:11, Parav Pandit wrote:
>> So it looks like below,
>> #cat rdma.resources.verbs.list
>> Output:
>> mlx4_0 uctx ah pd cq mr mw srq qp flow
>> mlx4_1 uctx ah pd cq mr mw srq qp flow rss_wq
> What happens if you set a limit of rss_wq to mlx4_0 in this example?
> Would it fail?
Yes, In above example, mlx4_0 device didn't had support for rss_wq, so
it didn't advertise in the list file that it supports rss_wq.

> I think it would be simpler for administrators if they
> can configure every resource supported by uverbs. If a resource is not
> supported by a specific device, you can never go over the limit anyway.
>
Exactly. Thats the implementation today.
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