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

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Message-ID: <20171130190117.GF7754@ziepe.ca>
Date:   Thu, 30 Nov 2017 12:01:17 -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 Thu, Nov 30, 2017 at 10:32:42AM -0800, Dan Williams wrote:
> > Who and how many LRU pages can pin that way and how do you prevent nasty
> > users to DoS systems this way?
> 
> I assume this is something the RDMA community has had to contend with?
> I'm not an RDMA person, I'm just here to fix dax.

The RDMA implementation respects the mlock rlimit

Jason