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From: Christopher Lameter <cl@linux.com>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: john.hubbard@gmail.com, Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, Al Viro <viro@zeniv.linux.org.uk>,
	Christian Benvenuti <benve@cisco.com>,
	Christoph Hellwig <hch@infradead.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Dave Chinner <david@fromorbit.com>,
	Dennis Dalessandro <dennis.dalessandro@intel.com>,
	Doug Ledford <dledford@redhat.com>, Jan Kara <jack@suse.cz>,
	Jerome Glisse <jglisse@redhat.com>,
	Matthew Wilcox <willy@infradead.org>,
	Michal Hocko <mhocko@kernel.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Mike Marciniszyn <mike.marciniszyn@intel.com>,
	Ralph Campbell <rcampbell@nvidia.com>,
	Tom Talpey <tom@talpey.com>, LKML <linux-kernel@vger.kernel.org>,
	linux-fsdevel@vger.kernel.org, John Hubbard <jhubbard@nvidia.com>
Subject: Re: [PATCH 0/6] RFC v2: mm: gup/dma tracking
Date: Mon, 4 Feb 2019 18:21:39 +0000
Message-ID: <01000168b9be8b5a-3b4f8036-50c8-4180-b39f-9ef28cb60cce-000000@email.amazonses.com> (raw)
In-Reply-To: <20190204175110.GA10237@ziepe.ca>

On Mon, 4 Feb 2019, Jason Gunthorpe wrote:

> On Mon, Feb 04, 2019 at 05:14:19PM +0000, Christopher Lameter wrote:
> > Frankly I still think this does not solve anything.
> >
> > Concurrent write access from two sources to a single page is simply wrong.
> > You cannot make this right by allowing long term RDMA pins in a filesystem
> > and thus the filesystem can never update part of its files on disk.
>
> Fundamentally this patch series is fixing O_DIRECT to not crash the
> kernel in extreme cases.. RDMA has the same problem, but it is much
> easier to hit.

O_DIRECT is the same issue. O_DIRECT addresses always have been in
anonymous memory or special file systems.

  reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-04  5:21 john.hubbard
2019-02-04  5:21 ` [PATCH 1/6] mm: introduce put_user_page*(), placeholder versions john.hubbard
2019-02-04  5:21 ` [PATCH 2/6] infiniband/mm: convert put_page() to put_user_page*() john.hubbard
2019-02-04  5:21 ` [PATCH 3/6] mm: page_cache_add_speculative(): refactoring john.hubbard
2019-02-04  5:21 ` [PATCH 4/6] mm/gup: track gup-pinned pages john.hubbard
2019-02-04 18:19   ` Matthew Wilcox
2019-02-04 19:11     ` John Hubbard
2019-02-20 19:24   ` Ira Weiny
2019-02-20 20:22     ` John Hubbard
2019-02-04  5:21 ` [PATCH 5/6] mm/gup: /proc/vmstat support for get/put user pages john.hubbard
2019-02-04  5:21 ` [PATCH 6/6] mm/gup: Documentation/vm/get_user_pages.rst, MAINTAINERS john.hubbard
2019-02-05 16:40   ` Mike Rapoport
2019-02-05 21:53     ` John Hubbard
2019-02-04 16:08 ` [PATCH 0/6] RFC v2: mm: gup/dma tracking Christopher Lameter
2019-02-04 16:12   ` Christoph Hellwig
2019-02-04 16:59     ` Christopher Lameter
2019-02-04 17:14 ` Christopher Lameter
2019-02-04 17:51   ` Jason Gunthorpe
2019-02-04 18:21     ` Christopher Lameter [this message]
2019-02-04 19:09       ` Matthew Wilcox
2019-02-04 23:35   ` Ira Weiny
2019-02-05 19:30     ` Christopher Lameter
2019-02-05  1:41 ` Tom Talpey
2019-02-05  8:22   ` John Hubbard
2019-02-05 13:38     ` Tom Talpey
2019-02-05 21:55       ` John Hubbard

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