linux-kernel - Re: [PATCH v3 0/1] mm: introduce put_user

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Date:   Thu, 14 Mar 2019 10:06:35 +0100
From:   Jan Kara <jack@...e.cz>
To:     Christopher Lameter <cl@...ux.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Dave Chinner <david@...morbit.com>,
        Ira Weiny <ira.weiny@...el.com>, john.hubbard@...il.com,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Al Viro <viro@...iv.linux.org.uk>,
        Christian Benvenuti <benve@...co.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jerome Glisse <jglisse@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Tom Talpey <tom@...pey.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH v3 0/1] mm: introduce put_user_page*(), placeholder
 versions

On Wed 13-03-19 19:21:37, Christopher Lameter wrote:
> On Wed, 13 Mar 2019, Christoph Hellwig wrote:
> 
> > On Wed, Mar 13, 2019 at 09:11:13AM +1100, Dave Chinner wrote:
> > > On Tue, Mar 12, 2019 at 03:39:33AM -0700, Ira Weiny wrote:
> > > > IMHO I don't think that the copy_file_range() is going to carry us through the
> > > > next wave of user performance requirements.  RDMA, while the first, is not the
> > > > only technology which is looking to have direct access to files.  XDP is
> > > > another.[1]
> > >
> > > Sure, all I doing here was demonstrating that people have been
> > > trying to get local direct access to file mappings to DMA directly
> > > into them for a long time. Direct Io games like these are now
> > > largely unnecessary because we now have much better APIs to do
> > > zero-copy data transfer between files (which can do hardware offload
> > > if it is available!).
> >
> > And that is just the file to file case.  There are tons of other
> > users of get_user_pages, including various drivers that do large
> > amounts of I/O like video capture.  For them it makes tons of sense
> > to transfer directly to/from a mmap()ed file.
> 
> That is very similar to the RDMA case and DAX etc. We need to have a way
> to tell a filesystem that this is going to happen and that things need to
> be setup for this to work properly.

The way to tell filesystem what's happening is exactly what we are working
on with these patches...

> But if that has not been done then I think its proper to fail a long term
> pin operation on page cache pages. Meaning the regular filesystems
> maintain control of whats happening with their pages.

And as I mentioned in my other email, we cannot just fail the pin for
pagecache pages as that would regress existing applications.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR