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From: Christopher Lameter <cl@linux.com>
To: john.hubbard@gmail.com
Cc: 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 17:14:19 +0000
Message-ID: <01000168b980e880-a7d8e0db-84fb-4398-8269-149c66b701b4-000000@email.amazonses.com> (raw)
In-Reply-To: <20190204052135.25784-1-jhubbard@nvidia.com>

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.

Can we just disable RDMA to regular filesystems? Regular filesystems
should have full control of the write back and dirty status of their
pages.

Special filesystems that do not actually do write back (like hugetlbfs),
mmaped raw device files and anonymous allocations are fine.


  parent 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 [this message]
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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