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

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Message-ID: <20160405140704.GC7822@mtj.duckdns.org>
Date:	Tue, 5 Apr 2016 10:07:04 -0400
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>, akpm@...ux-foundation.org,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCHv10 1/3] rdmacg: Added rdma cgroup controller

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.

Thanks.

-- 
tejun