linux-kernel - Re: [PATCH] Increase default MLOCK

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Date:   Tue, 23 Nov 2021 10:07:09 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     David Hildenbrand <david@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Andrew Dona-Couch <andrew@...acou.ch>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Drew DeVault <sir@...wn.com>,
        Ammar Faizi <ammarfaizi2@...weeb.org>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        io_uring Mailing List <io-uring@...r.kernel.org>,
        Pavel Begunkov <asml.silence@...il.com>, linux-mm@...ck.org
Subject: Re: [PATCH] Increase default MLOCK_LIMIT to 8 MiB

On Tue, Nov 23, 2021 at 02:39:19PM +0100, David Hildenbrand wrote:
> > 
> >> 2) Could be provide a mmu variant to ordinary users that's just good
> >> enough but maybe not as fast as what we have today? And limit
> >> FOLL_LONGTERM to special, privileged users?
> > 
> > rdma has never been privileged
> 
> Feel free to correct me if I'm wrong: it requires special networking
> hardware and the admin/kernel has to prepare the system in a way such
> that it can be used.

Not really, plug in the right PCI card and it works

"special" is a bit of a reach since almost every NIC sold in the > 100GB
segment supports some RDMA.

Jason