Re: [PATCH 0/5] use pinned_vm instead of locked_vm to account pinned pages

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Subject: Re: [PATCH 0/5] use pinned_vm instead of locked_vm to account pinned pages
From: Jason Gunthorpe <jgg@xxxxxxxx>
Date: Thu, 14 Feb 2019 15:16:29 -0700
Cc: Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>, akpm@xxxxxxxxxxxxxxxxxxxx, dave@xxxxxxxxxxxx, jack@xxxxxxx, cl@xxxxxxxxx, linux-mm@xxxxxxxxx, kvm@xxxxxxxxxxxxxxx, kvm-ppc@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-fpga@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, alex.williamson@xxxxxxxxxx, paulus@xxxxxxxxxx, benh@xxxxxxxxxxxxxxxxxxx, mpe@xxxxxxxxxxxxxx, hao.wu@xxxxxxxxx, atull@xxxxxxxxxx, mdf@xxxxxxxxxx, aik@xxxxxxxxx
In-reply-to: <20190214214650.GB7512@iweiny-DESK2.sc.intel.com>
References: <20190211224437.25267-1-daniel.m.jordan@oracle.com> <20190211225447.GN24692@ziepe.ca> <20190214015314.GB1151@iweiny-DESK2.sc.intel.com> <20190214060006.GE24692@ziepe.ca> <20190214193352.GA7512@iweiny-DESK2.sc.intel.com> <20190214201231.GC1739@ziepe.ca> <20190214214650.GB7512@iweiny-DESK2.sc.intel.com>
User-agent: Mutt/1.9.4 (2018-02-28)

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

Follow-Ups:
- Re: [PATCH 0/5] use pinned_vm instead of locked_vm to account pinned pages
  - From: Christopher Lameter

References:
- [PATCH 0/5] use pinned_vm instead of locked_vm to account pinned pages
  - From: Daniel Jordan
- Re: [PATCH 0/5] use pinned_vm instead of locked_vm to account pinned pages
  - From: Jason Gunthorpe
- Re: [PATCH 0/5] use pinned_vm instead of locked_vm to account pinned pages
  - From: Ira Weiny
- Re: [PATCH 0/5] use pinned_vm instead of locked_vm to account pinned pages
  - From: Jason Gunthorpe
- Re: [PATCH 0/5] use pinned_vm instead of locked_vm to account pinned pages
  - From: Ira Weiny
- Re: [PATCH 0/5] use pinned_vm instead of locked_vm to account pinned pages
  - From: Jason Gunthorpe
- Re: [PATCH 0/5] use pinned_vm instead of locked_vm to account pinned pages
  - From: Ira Weiny

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