linux-kernel - RE: [PATCH 3/6] drivers/IB,qib: do not use mmap

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Message-ID: <2807E5FD2F6FDA4886F6618EAC48510E79BA6A27@CRSMSX101.amr.corp.intel.com>
Date:   Wed, 30 Jan 2019 18:01:33 +0000
From:   "Weiny, Ira" <ira.weiny@...el.com>
To:     'Jason Gunthorpe' <jgg@...pe.ca>
CC:     Davidlohr Bueso <dave@...olabs.net>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "dledford@...hat.com" <dledford@...hat.com>,
        "jack@...e.de" <jack@...e.de>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Dalessandro, Dennis" <dennis.dalessandro@...el.com>,
        "Marciniszyn, Mike" <mike.marciniszyn@...el.com>,
        Davidlohr Bueso <dbueso@...e.de>
Subject: RE: [PATCH 3/6] drivers/IB,qib: do not use mmap_sem

> 
> On Tue, Jan 29, 2019 at 10:50:05AM -0800, Ira Weiny wrote:
> > > .. and I'm looking at some of the other conversions here.. *most
> > > likely* any caller that is manipulating rlimit for get_user_pages
> > > should really be calling get_user_pages_longterm, so they should not
> > > be converted to use _fast?
> >
> > Is this a question?  I'm not sure I understand the meaning here?
> 
> More an invitation to disprove the statement

Generally I agree.  But would be best if we could get fast GUP for performance.  I have not worked out if that will be possible with the final "longterm" solutions.

IRa

> 
> Jason