From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jason Gunthorpe <jgg@ziepe.ca>
Subject: Re: [PATCH v3 1/4] mm: introduce get_user_pages_longterm
Date: Fri, 1 Dec 2017 09:31:40 -0700
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To: Dan Williams <dan.j.williams@intel.com>
Cc: Michal Hocko <mhocko@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Linux MM <linux-mm@kvack.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Christoph Hellwig <hch@lst.de>, "stable@vger.kernel.org" <stable@vger.kernel.org>, "linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>, linux-rdma <linux-rdma@vger.kernel.org>
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On Fri, Dec 01, 2017 at 08:29:53AM -0800, Dan Williams wrote:
> > And maybe we should think about moving the rlimit accounting into this
> > new function too someday?
> 
> DAX pages are not accounted in any rlimit because they are statically
> allocated reserved memory regions.

I mean, unrelated to DAX, any user of get_user_pages_longterm should
respect the memlock rlimit and that check is shared code.

Jason