linux-kernel - Re: [PATCH v3 1/4] mm: introduce get_user_pages

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Message-ID: <20171201163140.GJ7754@ziepe.ca>
Date:   Fri, 1 Dec 2017 09:31:40 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        linux-rdma <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH v3 1/4] mm: introduce get_user_pages_longterm

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