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Date: Thu, 7 Jan 2016 15:28:18 -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 3/6] rdmacg: implements rdma cgroup Hello, Parav. On Fri, Jan 08, 2016 at 01:55:09AM +0530, Parav Pandit wrote: ... > Above functionality is achieved, by maintaining the map this tgid and > associated original cgroup at try_charge(), uncharge() time. Hmmm, what happens after the following? 1. A process allocates some rdma resources and get registered on the hash table. 2. The process gets migrated to a different cgroup. 3. The process allocates more rdma resources. Which cgroup would the resources from #3 be attributed to? > In alternate method, > Its simple to store the pointer of rdma_cgroup structure in the IB > resource structure and hold on reference count to rdma_cgroup. > so that when its freed, uncharge_resource can accept rdma_cgroup > structure pointer. That'd be a lot more in line with how other controllers behave. Thanks. -- tejun
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