linux-kernel - Re: [PATCHv7 1/3] rdmacg: Added rdma cgroup controller

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Date:	Tue, 1 Mar 2016 10:26:53 +0200
From:	Haggai Eran <haggaie@...lanox.com>
To:	Parav Pandit <pandit.parav@...il.com>, <cgroups@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-rdma@...r.kernel.org>, <tj@...nel.org>,
	<lizefan@...wei.com>, <hannes@...xchg.org>, <dledford@...hat.com>,
	<liranl@...lanox.com>, <sean.hefty@...el.com>,
	<jgunthorpe@...idianresearch.com>
CC:	<corbet@....net>, <james.l.morris@...cle.com>, <serge@...lyn.com>,
	<ogerlitz@...lanox.com>, <matanb@...lanox.com>,
	<raindel@...lanox.com>, <akpm@...ux-foundation.org>,
	<linux-security-module@...r.kernel.org>
Subject: Re: [PATCHv7 1/3] rdmacg: Added rdma cgroup controller

On 28/02/2016 16:13, Parav Pandit wrote:
> Added rdma cgroup controller that does accounting, limit enforcement
> on rdma/IB verbs and hw resources.
> 
> Added rdma cgroup header file which defines its APIs to perform
> charing/uncharing functionality and device registration which will
> participate in controller functions of accounting and limit
> enforcements. It also define rdmacg_device structure to bind IB stack
> and RDMA cgroup controller.
> 
> RDMA resources are tracked using resource pool. Resource pool is per
> device, per cgroup entity which allows setting up accounting limits
> on per device basis.
> 
> Resources are not defined by the RDMA cgroup, instead they are defined
> by the external module IB stack. This allows extending IB stack
> without changing kernel, as IB stack is going through changes
> and enhancements.
> 
> Resource pool is created/destroyed dynamically whenever
> charging/uncharging occurs respectively and whenever user
> configuration is done. Its a tradeoff of memory vs little more code
> space that creates resource pool whenever necessary,
> instead of creating them during cgroup creation and device registration
> time.
> 
> Signed-off-by: Parav Pandit <pandit.parav@...il.com>

Reviewed-by: Haggai Eran <haggaie@...lanox.com>