From: Christoph Hellwig <hch@infradead.org>
To: Christopher Lameter <cl@linux.com>
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>,
Jason Gunthorpe <jgg@ziepe.ca>,
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 08:12:01 -0800 [thread overview]
Message-ID: <20190204161201.GA6840@infradead.org> (raw)
In-Reply-To: <01000168b94439c0-28d5e096-718d-4e39-a7af-20d0a6d7b768-000000@email.amazonses.com>
On Mon, Feb 04, 2019 at 04:08:02PM +0000, Christopher Lameter wrote:
> It may be worth noting a couple of times in this text that this was
> designed for anonymous memory and that such use is/was ok. We are talking
> about a use case here using mmapped access with a regular filesystem that
> was not initially intended. The mmapping of from the hugepages filesystem
> is special in that it is not a device that is actually writing things
> back.
>
> Any use with a filesystem that actually writes data back to a medium
> is something that is broken.
Saying it was not intended seems rather odd, as it was supported
since day 0 and people made use of it.
next prev parent reply other threads:[~2019-02-04 16:12 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-04 5:21 [PATCH 0/6] RFC v2: mm: gup/dma tracking 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
2019-02-11 9:51 ` [LKP] [mm/gup] cdaa813278: kvm-unit-tests.vmx_ept_access_test_paddr_read_write.fail kernel test robot
2019-02-20 19:24 ` [PATCH 4/6] mm/gup: track gup-pinned pages Ira Weiny
2019-02-20 20:22 ` John Hubbard
2019-02-28 12:15 ` [LKP] [mm/gup] cdaa813278: stress-ng.numa.ops_per_sec 4671.0% improvement kernel test robot
2019-02-04 5:21 ` [PATCH 5/6] mm/gup: /proc/vmstat support for get/put user pages john.hubbard
2019-02-18 2:16 ` [LKP] [mm/gup] e7ae097b0b: will-it-scale.per_process_ops -5.0% regression kernel test robot
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 [this message]
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
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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