From: Jan Kara <jack@suse.cz>
To: Doug Ledford <dledford@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>,
Christopher Lameter <cl@linux.com>,
Jason Gunthorpe <jgg@ziepe.ca>, Jan Kara <jack@suse.cz>,
Ira Weiny <ira.weiny@intel.com>,
lsf-pc@lists.linux-foundation.org, linux-rdma@vger.kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
John Hubbard <jhubbard@nvidia.com>,
Jerome Glisse <jglisse@redhat.com>,
Dan Williams <dan.j.williams@intel.com>,
Dave Chinner <david@fromorbit.com>,
Michal Hocko <mhocko@kernel.org>
Subject: Re: [LSF/MM TOPIC] Discuss least bad options for resolving longterm-GUP usage by RDMA
Date: Thu, 7 Feb 2019 17:48:36 +0100 [thread overview]
Message-ID: <20190207164836.GL3597@quack2.suse.cz> (raw)
In-Reply-To: <a5b976cad6a578f0a6e6573acbf547ceb9dad6c7.camel@redhat.com>
On Wed 06-02-19 15:54:01, Doug Ledford wrote:
> On Wed, 2019-02-06 at 12:20 -0800, Matthew Wilcox wrote:
> > On Wed, Feb 06, 2019 at 03:16:02PM -0500, Doug Ledford wrote:
> > > On Wed, 2019-02-06 at 11:40 -0800, Matthew Wilcox wrote:
> > > > On Wed, Feb 06, 2019 at 07:16:21PM +0000, Christopher Lameter wrote:
> > > > > though? If we only allow this use case then we may not have to worry about
> > > > > long term GUP because DAX mapped files will stay in the physical location
> > > > > regardless.
> > > >
> > > > ... except for truncate. And now that I think about it, there was a
> > > > desire to support hot-unplug which also needed revoke.
> > >
> > > We already support hot unplug of RDMA devices. But it is extreme. How
> > > does hot unplug deal with a program running from the device (something
> > > that would have returned ETXTBSY)?
> >
> > Not hot-unplugging the RDMA device but hot-unplugging an NV-DIMM.
>
> Is an NV-DIMM the only thing we use DAX on?
Currently yes. However KVM people are soon going to use it for their
purposes as well (essentially directly sharing host page cache between
guests).
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2019-02-07 16:48 UTC|newest]
Thread overview: 155+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-05 17:50 [LSF/MM TOPIC] Discuss least bad options for resolving longterm-GUP usage by RDMA Ira Weiny
2019-02-05 18:01 ` Ira Weiny
2019-02-06 21:31 ` Dave Chinner
2019-02-06 9:50 ` Jan Kara
2019-02-06 17:31 ` Jason Gunthorpe
2019-02-06 17:52 ` Matthew Wilcox
2019-02-06 18:32 ` Doug Ledford
2019-02-06 18:32 ` Doug Ledford
2019-02-06 18:35 ` Matthew Wilcox
2019-02-06 18:44 ` Doug Ledford
2019-02-06 18:44 ` Doug Ledford
2019-02-06 18:52 ` Jason Gunthorpe
2019-02-06 19:45 ` Dan Williams
2019-02-06 19:45 ` Dan Williams
2019-02-06 20:14 ` Doug Ledford
2019-02-06 21:04 ` Dan Williams
2019-02-06 21:04 ` Dan Williams
2019-02-06 21:12 ` Doug Ledford
2019-02-06 21:12 ` Doug Ledford
2019-02-06 19:16 ` Christopher Lameter
2019-02-06 19:16 ` Christopher Lameter
2019-02-06 19:40 ` Matthew Wilcox
2019-02-06 20:16 ` Doug Ledford
2019-02-06 20:16 ` Doug Ledford
2019-02-06 20:20 ` Matthew Wilcox
2019-02-06 20:28 ` Doug Ledford
2019-02-06 20:28 ` Doug Ledford
2019-02-06 20:41 ` Matthew Wilcox
2019-02-06 20:47 ` Doug Ledford
2019-02-06 20:47 ` Doug Ledford
2019-02-06 20:49 ` Matthew Wilcox
2019-02-06 20:50 ` Doug Ledford
2019-02-06 20:50 ` Doug Ledford
2019-02-06 20:31 ` Jason Gunthorpe
2019-02-06 20:39 ` Christopher Lameter
2019-02-06 20:39 ` Christopher Lameter
2019-02-06 20:54 ` Doug Ledford
2019-02-06 20:54 ` Doug Ledford
2019-02-07 16:48 ` Jan Kara [this message]
2019-02-06 20:24 ` Christopher Lameter
2019-02-06 20:24 ` Christopher Lameter
2019-02-06 21:03 ` Dave Chinner
2019-02-06 22:08 ` Jason Gunthorpe
2019-02-06 22:24 ` Doug Ledford
2019-02-06 22:24 ` Doug Ledford
2019-02-06 22:44 ` Dan Williams
2019-02-06 22:44 ` Dan Williams
2019-02-06 23:21 ` Jason Gunthorpe
2019-02-06 23:30 ` Dan Williams
2019-02-06 23:30 ` Dan Williams
2019-02-06 23:41 ` Jason Gunthorpe
2019-02-07 0:22 ` Dan Williams
2019-02-07 0:22 ` Dan Williams
2019-02-07 0:22 ` Dan Williams
2019-02-07 0:22 ` Dan Williams
2019-02-07 5:33 ` Jason Gunthorpe
2019-02-07 1:57 ` Doug Ledford
2019-02-07 1:57 ` Doug Ledford
2019-02-07 2:48 ` Dan Williams
2019-02-07 2:48 ` Dan Williams
2019-02-07 2:48 ` Dan Williams
2019-02-07 2:48 ` Dan Williams
2019-02-07 2:42 ` Doug Ledford
2019-02-07 2:42 ` Doug Ledford
2019-02-07 3:13 ` Dan Williams
2019-02-07 3:13 ` Dan Williams
2019-02-07 17:23 ` Ira Weiny
2019-02-07 16:25 ` Doug Ledford
2019-02-07 16:25 ` Doug Ledford
2019-02-07 16:55 ` Christopher Lameter
2019-02-07 16:55 ` Christopher Lameter
2019-02-07 17:35 ` Ira Weiny
2019-02-07 18:17 ` Christopher Lameter
2019-02-07 18:17 ` Christopher Lameter
2019-02-08 4:43 ` Dave Chinner
2019-02-08 11:10 ` Jan Kara
2019-02-08 20:50 ` Dan Williams
2019-02-08 20:50 ` Dan Williams
2019-02-11 10:24 ` Jan Kara
2019-02-11 17:22 ` Dan Williams
2019-02-11 17:22 ` Dan Williams
2019-02-11 18:06 ` Jason Gunthorpe
2019-02-11 18:15 ` Dan Williams
2019-02-11 18:15 ` Dan Williams
2019-02-11 18:19 ` Ira Weiny
2019-02-11 18:26 ` Jason Gunthorpe
2019-02-11 18:40 ` Matthew Wilcox
2019-02-11 19:58 ` Dan Williams
2019-02-11 19:58 ` Dan Williams
2019-02-11 20:49 ` Jason Gunthorpe
2019-02-11 21:02 ` Dan Williams
2019-02-11 21:02 ` Dan Williams
2019-02-11 21:09 ` Jason Gunthorpe
2019-02-12 16:34 ` Jan Kara
2019-02-12 16:55 ` Christopher Lameter
2019-02-12 16:55 ` Christopher Lameter
2019-02-13 15:06 ` Jan Kara
2019-02-12 16:36 ` Christopher Lameter
2019-02-12 16:36 ` Christopher Lameter
2019-02-12 16:44 ` Jan Kara
2019-02-11 21:08 ` Jerome Glisse
2019-02-11 21:22 ` John Hubbard
2019-02-11 21:22 ` John Hubbard
2019-02-11 22:12 ` Jason Gunthorpe
2019-02-11 22:33 ` John Hubbard
2019-02-11 22:33 ` John Hubbard
2019-02-12 16:39 ` Christopher Lameter
2019-02-12 16:39 ` Christopher Lameter
2019-02-13 2:58 ` John Hubbard
2019-02-13 2:58 ` John Hubbard
2019-02-12 16:28 ` Jan Kara
2019-02-14 20:26 ` Jerome Glisse
2019-02-14 20:50 ` Matthew Wilcox
2019-02-14 21:39 ` Jerome Glisse
2019-02-15 1:19 ` Dave Chinner
2019-02-15 15:42 ` Christopher Lameter
2019-02-15 15:42 ` Christopher Lameter
2019-02-15 18:08 ` Matthew Wilcox
2019-02-15 18:31 ` Christopher Lameter
2019-02-15 18:31 ` Christopher Lameter
2019-02-15 22:00 ` Jason Gunthorpe
2019-02-15 23:38 ` Ira Weiny
2019-02-16 22:42 ` Dave Chinner
2019-02-17 2:54 ` Christopher Lameter
2019-02-17 2:54 ` Christopher Lameter
2019-02-12 16:07 ` Jan Kara
2019-02-12 21:53 ` Dan Williams
2019-02-12 21:53 ` Dan Williams
2019-02-08 21:20 ` Dave Chinner
2019-02-08 15:33 ` Christopher Lameter
2019-02-08 15:33 ` Christopher Lameter
2019-02-07 17:24 ` Matthew Wilcox
2019-02-07 17:26 ` Jason Gunthorpe
2019-02-07 3:52 ` Dave Chinner
2019-02-07 5:23 ` Jason Gunthorpe
2019-02-07 6:00 ` Dan Williams
2019-02-07 6:00 ` Dan Williams
2019-02-07 17:17 ` Jason Gunthorpe
2019-02-07 23:54 ` Dan Williams
2019-02-07 23:54 ` Dan Williams
2019-02-08 1:44 ` Ira Weiny
2019-02-08 5:19 ` Jason Gunthorpe
2019-02-08 7:20 ` Dan Williams
2019-02-08 7:20 ` Dan Williams
2019-02-08 15:42 ` Jason Gunthorpe
2019-02-07 15:04 ` Chuck Lever
2019-02-07 15:28 ` Tom Talpey
2019-02-07 15:37 ` Doug Ledford
2019-02-07 15:37 ` Doug Ledford
2019-02-07 15:41 ` Tom Talpey
2019-02-07 15:56 ` Doug Ledford
2019-02-07 15:56 ` Doug Ledford
2019-02-07 16:57 ` Ira Weiny
2019-02-07 21:31 ` Tom Talpey
2019-02-07 16:54 ` Ira Weiny
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