From: Haggai Eran <haggaie@mellanox.com>
To: Parav Pandit <pandit.parav@gmail.com>, <cgroups@vger.kernel.org>,
<linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-rdma@vger.kernel.org>, <tj@kernel.org>,
<lizefan@huawei.com>, <hannes@cmpxchg.org>, <dledford@redhat.com>
Cc: <corbet@lwn.net>, <james.l.morris@oracle.com>, <serge@hallyn.com>,
<ogerlitz@mellanox.com>, <matanb@mellanox.com>,
<raindel@mellanox.com>, <akpm@linux-foundation.org>,
<linux-security-module@vger.kernel.org>
Subject: Re: [PATCH 0/7] devcg: device cgroup extension for rdma resource
Date: Tue, 8 Sep 2015 15:45:50 +0300 [thread overview]
Message-ID: <55EED87E.3000408@mellanox.com> (raw)
In-Reply-To: <1441658303-18081-1-git-send-email-pandit.parav@gmail.com>
On 07/09/2015 23:38, Parav Pandit wrote:
> Currently user space applications can easily take away all the rdma
> device specific resources such as AH, CQ, QP, MR etc. Due to which other
> applications in other cgroup or kernel space ULPs may not even get chance
> to allocate any rdma resources.
>
> This patch-set allows limiting rdma resources to set of processes.
> It extend device cgroup controller for limiting rdma device limits.
I don't think extending the device cgroup is the right place for these
limits. It is currently a very generic controller and adding various
RDMA resources to it looks out of place. Why not create a new controller
for rdma?
Another thing I noticed is that all limits in this cgroup are global,
while the resources they control are hardware device specific.
I think it would be better if the cgroup controlled the limits of each
device separately.
> With this patch, user verbs module queries rdma device cgroup controller
> to query process's limit to consume such resource. It uncharge resource
> counter after resource is being freed.
This is another reason why per-device limits would be better. Since
limits are reflected to user-space when querying a specific device, it
will show the same maximum limit on every device opened. If the user
opens 3 devices they might expect to be able to open 3 times the number
of the resources they actually can.
Regards,
Haggai
WARNING: multiple messages have this Message-ID (diff)
From: Haggai Eran <haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
To: Parav Pandit
<pandit.parav-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org,
dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Cc: corbet-T1hC0tSOHrs@public.gmane.org,
james.l.morris-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org,
serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org,
ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org,
matanb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org,
raindel-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org,
akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 0/7] devcg: device cgroup extension for rdma resource
Date: Tue, 8 Sep 2015 15:45:50 +0300 [thread overview]
Message-ID: <55EED87E.3000408@mellanox.com> (raw)
In-Reply-To: <1441658303-18081-1-git-send-email-pandit.parav-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
On 07/09/2015 23:38, Parav Pandit wrote:
> Currently user space applications can easily take away all the rdma
> device specific resources such as AH, CQ, QP, MR etc. Due to which other
> applications in other cgroup or kernel space ULPs may not even get chance
> to allocate any rdma resources.
>
> This patch-set allows limiting rdma resources to set of processes.
> It extend device cgroup controller for limiting rdma device limits.
I don't think extending the device cgroup is the right place for these
limits. It is currently a very generic controller and adding various
RDMA resources to it looks out of place. Why not create a new controller
for rdma?
Another thing I noticed is that all limits in this cgroup are global,
while the resources they control are hardware device specific.
I think it would be better if the cgroup controlled the limits of each
device separately.
> With this patch, user verbs module queries rdma device cgroup controller
> to query process's limit to consume such resource. It uncharge resource
> counter after resource is being freed.
This is another reason why per-device limits would be better. Since
limits are reflected to user-space when querying a specific device, it
will show the same maximum limit on every device opened. If the user
opens 3 devices they might expect to be able to open 3 times the number
of the resources they actually can.
Regards,
Haggai
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next prev parent reply other threads:[~2015-09-08 12:46 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-07 20:38 [PATCH 0/7] devcg: device cgroup extension for rdma resource Parav Pandit
2015-09-07 20:38 ` Parav Pandit
2015-09-07 20:38 ` [PATCH 1/7] devcg: Added user option to rdma resource tracking Parav Pandit
2015-09-07 20:38 ` Parav Pandit
2015-09-07 20:38 ` [PATCH 2/7] devcg: Added rdma resource tracking module Parav Pandit
2015-09-07 20:38 ` Parav Pandit
2015-09-07 20:38 ` [PATCH 3/7] devcg: Added infrastructure for rdma device cgroup Parav Pandit
2015-09-08 5:31 ` Haggai Eran
2015-09-08 5:31 ` Haggai Eran
2015-09-08 7:02 ` Parav Pandit
2015-09-08 7:02 ` Parav Pandit
2015-09-07 20:38 ` [PATCH 4/7] devcg: Added rdma resource tracker object per task Parav Pandit
2015-09-08 5:48 ` Haggai Eran
2015-09-08 5:48 ` Haggai Eran
2015-09-08 7:04 ` Parav Pandit
2015-09-08 8:24 ` Haggai Eran
2015-09-08 8:24 ` Haggai Eran
2015-09-08 8:26 ` Parav Pandit
2015-09-07 20:38 ` [PATCH 5/7] devcg: device cgroup's extension for RDMA resource Parav Pandit
2015-09-07 20:38 ` Parav Pandit
2015-09-08 8:22 ` Haggai Eran
2015-09-08 8:22 ` Haggai Eran
2015-09-08 10:18 ` Parav Pandit
2015-09-08 13:50 ` Haggai Eran
2015-09-08 13:50 ` Haggai Eran
2015-09-08 14:13 ` Parav Pandit
2015-09-08 8:36 ` Haggai Eran
2015-09-08 8:36 ` Haggai Eran
2015-09-08 10:50 ` Parav Pandit
2015-09-08 10:50 ` Parav Pandit
2015-09-08 14:10 ` Haggai Eran
2015-09-08 14:10 ` Haggai Eran
2015-09-07 20:38 ` [PATCH 6/7] devcg: Added support to use RDMA device cgroup Parav Pandit
2015-09-08 8:40 ` Haggai Eran
2015-09-08 8:40 ` Haggai Eran
2015-09-08 10:22 ` Parav Pandit
2015-09-08 13:40 ` Haggai Eran
2015-09-08 13:40 ` Haggai Eran
2015-09-07 20:38 ` [PATCH 7/7] devcg: Added Documentation of " Parav Pandit
2015-09-07 20:38 ` Parav Pandit
2015-09-07 20:55 ` [PATCH 0/7] devcg: device cgroup extension for rdma resource Parav Pandit
2015-09-08 12:45 ` Haggai Eran [this message]
2015-09-08 12:45 ` Haggai Eran
2015-09-08 15:23 ` Tejun Heo
2015-09-08 15:23 ` Tejun Heo
2015-09-09 3:57 ` Parav Pandit
2015-09-10 16:49 ` Tejun Heo
2015-09-10 17:46 ` Parav Pandit
2015-09-10 17:46 ` Parav Pandit
2015-09-10 20:22 ` Tejun Heo
2015-09-11 3:39 ` Parav Pandit
2015-09-11 4:04 ` Tejun Heo
2015-09-11 4:04 ` Tejun Heo
2015-09-11 4:24 ` Doug Ledford
2015-09-11 4:24 ` Doug Ledford
2015-09-11 14:52 ` Tejun Heo
2015-09-11 14:52 ` Tejun Heo
2015-09-11 16:26 ` Parav Pandit
2015-09-11 16:34 ` Tejun Heo
2015-09-11 16:34 ` Tejun Heo
2015-09-11 16:39 ` Parav Pandit
2015-09-11 16:39 ` Parav Pandit
2015-09-11 19:25 ` Tejun Heo
2015-09-14 10:18 ` Parav Pandit
2015-09-14 10:18 ` Parav Pandit
2015-09-11 16:47 ` Parav Pandit
2015-09-11 16:47 ` Parav Pandit
2015-09-11 19:05 ` Tejun Heo
2015-09-11 19:05 ` Tejun Heo
2015-09-11 19:22 ` Hefty, Sean
2015-09-11 19:43 ` Jason Gunthorpe
2015-09-11 19:43 ` Jason Gunthorpe
2015-09-11 20:06 ` Hefty, Sean
2015-09-14 11:09 ` Parav Pandit
2015-09-14 14:04 ` Parav Pandit
2015-09-14 15:21 ` Tejun Heo
2015-09-14 15:21 ` Tejun Heo
2015-09-14 17:28 ` Jason Gunthorpe
2015-09-14 17:28 ` Jason Gunthorpe
2015-09-14 18:54 ` Parav Pandit
2015-09-14 18:54 ` Parav Pandit
2015-09-14 20:18 ` Jason Gunthorpe
2015-09-15 3:08 ` Parav Pandit
2015-09-15 3:45 ` Jason Gunthorpe
2015-09-15 3:45 ` Jason Gunthorpe
2015-09-16 4:41 ` Parav Pandit
2015-09-16 4:41 ` Parav Pandit
2015-09-20 10:35 ` Haggai Eran
2015-09-20 10:35 ` Haggai Eran
2015-10-28 8:14 ` Parav Pandit
2015-10-28 8:14 ` Parav Pandit
2015-09-14 10:15 ` Parav Pandit
2015-09-11 4:43 ` Parav Pandit
2015-09-11 15:03 ` Tejun Heo
2015-09-10 17:48 ` Hefty, Sean
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