From: Tejun Heo <tj@kernel.org>
To: Parav Pandit <pandit.parav@gmail.com>
Cc: Doug Ledford <dledford@redhat.com>,
cgroups@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org,
lizefan@huawei.com, Johannes Weiner <hannes@cmpxchg.org>,
Jonathan Corbet <corbet@lwn.net>,
james.l.morris@oracle.com, serge@hallyn.com,
Haggai Eran <haggaie@mellanox.com>,
Or Gerlitz <ogerlitz@mellanox.com>,
Matan Barak <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: Fri, 11 Sep 2015 15:05:34 -0400 [thread overview]
Message-ID: <20150911190534.GT8114@mtj.duckdns.org> (raw)
In-Reply-To: <CAG53R5X5o8hJX1VJ00j5Bxuaps3FGCPNss4ey-07Dq+XP8xoBg@mail.gmail.com>
Hello, Parav.
On Fri, Sep 11, 2015 at 10:17:42PM +0530, Parav Pandit wrote:
> IO controller and applications are mature in nature.
> When IO controller throttles the IO, applications are pretty mature
> where if IO takes longer to complete, there is possibly almost no way
> to cancel the system call or rather application might not want to
> cancel the IO at least the non asynchronous one.
I was more talking about the fact that they allow resources to be
consumed when they aren't contended.
> So application just notice lower performance than throttled way.
> Its really not possible at RDMA level with RDMA resource to hold up
> resource creation call for longer time, because reusing existing
> resource with failed status can likely to give better performance.
> As Doug explained in his example, many RDMA resources as its been used
> by applications are relatively long lived. So holding ups resource
> creation while its taken by other process will certainly will look bad
> on application performance front compare to returning failure and
> reusing existing one once its available or once new one is available.
I'm not really sold on the idea that this can be used to implement
performance based resource distribution. I'll write more about that
on the other subthread.
Thanks.
--
tejun
WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Parav Pandit <pandit.parav-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@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,
lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>,
james.l.morris-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org,
serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org,
Haggai Eran <haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Matan Barak <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: Fri, 11 Sep 2015 15:05:34 -0400 [thread overview]
Message-ID: <20150911190534.GT8114@mtj.duckdns.org> (raw)
In-Reply-To: <CAG53R5X5o8hJX1VJ00j5Bxuaps3FGCPNss4ey-07Dq+XP8xoBg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
Hello, Parav.
On Fri, Sep 11, 2015 at 10:17:42PM +0530, Parav Pandit wrote:
> IO controller and applications are mature in nature.
> When IO controller throttles the IO, applications are pretty mature
> where if IO takes longer to complete, there is possibly almost no way
> to cancel the system call or rather application might not want to
> cancel the IO at least the non asynchronous one.
I was more talking about the fact that they allow resources to be
consumed when they aren't contended.
> So application just notice lower performance than throttled way.
> Its really not possible at RDMA level with RDMA resource to hold up
> resource creation call for longer time, because reusing existing
> resource with failed status can likely to give better performance.
> As Doug explained in his example, many RDMA resources as its been used
> by applications are relatively long lived. So holding ups resource
> creation while its taken by other process will certainly will look bad
> on application performance front compare to returning failure and
> reusing existing one once its available or once new one is available.
I'm not really sold on the idea that this can be used to implement
performance based resource distribution. I'll write more about that
on the other subthread.
Thanks.
--
tejun
next prev parent reply other threads:[~2015-09-11 19:05 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
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 [this message]
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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