linux-kernel - Re: [PATCH 0/5] use pinned_vm instead of locked

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Message-ID: <20190214221629.GD1739@ziepe.ca>
Date:   Thu, 14 Feb 2019 15:16:29 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     Daniel Jordan <daniel.m.jordan@...cle.com>,
        akpm@...ux-foundation.org, dave@...olabs.net, jack@...e.cz,
        cl@...ux.com, linux-mm@...ck.org, kvm@...r.kernel.org,
        kvm-ppc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        alex.williamson@...hat.com, paulus@...abs.org,
        benh@...nel.crashing.org, mpe@...erman.id.au, hao.wu@...el.com,
        atull@...nel.org, mdf@...nel.org, aik@...abs.ru
Subject: Re: [PATCH 0/5] use pinned_vm instead of locked_vm to account pinned
 pages

On Thu, Feb 14, 2019 at 01:46:51PM -0800, Ira Weiny wrote:

> > > > Really unclear how to fix this. The pinned/locked split with two
> > > > buckets may be the right way.
> > > 
> > > Are you suggesting that we have 2 user limits?
> > 
> > This is what RDMA has done since CL's patch.
> 
> I don't understand?  What is the other _user_ limit (other than
> RLIMIT_MEMLOCK)?

With todays implementation RLIMIT_MEMLOCK covers two user limits,
total number of pinned pages and total number of mlocked pages. The
two are different buckets and not summed.

Jason