linux-kernel - Re: [PATCH 0/3] Add gup fast + longterm and use it in HFI1

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Date:   Mon, 11 Feb 2019 13:29:14 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Daniel Borkmann <daniel@...earbox.net>,
        netdev@...r.kernel.org,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH 0/3] Add gup fast + longterm and use it in HFI1

On Mon, Feb 11, 2019 at 12:34:17PM -0800, Davidlohr Bueso wrote:
> On Mon, 11 Feb 2019, ira.weiny@...el.com wrote:
> > Ira Weiny (3):
> >  mm/gup: Change "write" parameter to flags
> >  mm/gup: Introduce get_user_pages_fast_longterm()
> >  IB/HFI1: Use new get_user_pages_fast_longterm()
> 
> Out of curiosity, are you planning on having all rdma drivers
> use get_user_pages_fast_longterm()? Ie:
> 
> hw/mthca/mthca_memfree.c:       ret = get_user_pages_fast(uaddr & PAGE_MASK, 1, FOLL_WRITE, pages);
> hw/qib/qib_user_sdma.c:         ret = get_user_pages_fast(addr, j, 0, pages);

I missed that when I change the other qib call to longterm...  :-(

Yes both of these should be changed.  Although I need to look into Jasons
comment WRT the mthca call.

Ira

> 
> Thanks,
> Davidlohr