linux-kernel - Re: [PATCHv10 1/3] rdmacg: Added rdma cgroup controller

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Date:	Tue, 5 Apr 2016 07:14:49 -0700
From:	Parav Pandit <pandit.parav@...il.com>
To:	Tejun Heo <tj@...nel.org>
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>, akpm@...ux-foundation.org,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCHv10 1/3] rdmacg: Added rdma cgroup controller

On Tue, Apr 5, 2016 at 7:07 AM, Tejun Heo <tj@...nel.org> wrote:
> Just one more thing.
>
> On Tue, Apr 05, 2016 at 10:01:07AM -0400, Tejun Heo wrote:
> ...
>> > pool_info in spin lock context, made me allocate memory to get all
>> > values upfront through allocation.
>> > Now that the lock is going away, I can do what you have described above.
>
> So, this might be okay depending on the use case but it often becomes
> painful to require sleeping context for freeing resources.  If you're
> certain that requiring sleeping context is okay for all paths, using a
> single mutex is fine but *usually* it isn't a great idea.
>
At present charge and uncharge are from sleeping context.

>
> --
> tejun