linux-kernel - Re: [RESEND PATCH 0/7] Add FOLL_LONGTERM to GUP fast and use it

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Message-ID: <20190220180255.GA12020@iweiny-DESK2.sc.intel.com>
Date:   Wed, 20 Feb 2019 10:02:56 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     John Hubbard <jhubbard@...dia.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Rich Felker <dalias@...c.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-mips@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        kvm-ppc@...r.kernel.org, kvm@...r.kernel.org,
        linux-fpga@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-rdma@...r.kernel.org, linux-media@...r.kernel.org,
        linux-scsi@...r.kernel.org, devel@...verdev.osuosl.org,
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        devel@...ts.orangefs.org, ceph-devel@...r.kernel.org,
        rds-devel@....oracle.com
Subject: Re: [RESEND PATCH 0/7] Add FOLL_LONGTERM to GUP fast and use it

On Wed, Feb 20, 2019 at 07:19:30AM -0800, Christoph Hellwig wrote:
> On Tue, Feb 19, 2019 at 09:30:33PM -0800, ira.weiny@...el.com wrote:
> > From: Ira Weiny <ira.weiny@...el.com>
> > 
> > Resending these as I had only 1 minor comment which I believe we have covered
> > in this series.  I was anticipating these going through the mm tree as they
> > depend on a cleanup patch there and the IB changes are very minor.  But they
> > could just as well go through the IB tree.
> > 
> > NOTE: This series depends on my clean up patch to remove the write parameter
> > from gup_fast_permitted()[1]
> > 
> > HFI1, qib, and mthca, use get_user_pages_fast() due to it performance
> > advantages.  These pages can be held for a significant time.  But
> > get_user_pages_fast() does not protect against mapping of FS DAX pages.
> 
> This I don't get - if you do lock down long term mappings performance
> of the actual get_user_pages call shouldn't matter to start with.
> 
> What do I miss?

A couple of points.

First "longterm" is a relative thing and at this point is probably a misnomer.
This is really flagging a pin which is going to be given to hardware and can't
move.  I've thought of a couple of alternative names but I think we have to
settle on if we are going to use FL_LAYOUT or something else to solve the
"longterm" problem.  Then I think we can change the flag to a better name.

Second, It depends on how often you are registering memory.  I have spoken with
some RDMA users who consider MR in the performance path...  For the overall
application performance.  I don't have the numbers as the tests for HFI1 were
done a long time ago.  But there was a significant advantage.  Some of which is
probably due to the fact that you don't have to hold mmap_sem.

Finally, architecturally I think it would be good for everyone to use *_fast.
There are patches submitted to the RDMA list which would allow the use of
*_fast (they reworking the use of mmap_sem) and as soon as they are accepted
I'll submit a patch to convert the RDMA core as well.  Also to this point
others are looking to use *_fast.[2]

As an asside, Jasons pointed out in my previous submission that *_fast and
*_unlocked look very much the same.  I agree and I think further cleanup will
be coming.  But I'm focused on getting the final solution for DAX at the
moment.

Ira