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From: Jason Gunthorpe <jgg@ziepe.ca>
To: Dan Williams <dan.j.williams@intel.com>
Cc: "Ira Weiny" <ira.weiny@intel.com>, "Jan Kara" <jack@suse.cz>,
	"Theodore Ts'o" <tytso@mit.edu>,
	"Jeff Layton" <jlayton@kernel.org>,
	"Dave Chinner" <david@fromorbit.com>,
	"Matthew Wilcox" <willy@infradead.org>,
	linux-xfs <linux-xfs@vger.kernel.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"John Hubbard" <jhubbard@nvidia.com>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	linux-nvdimm <linux-nvdimm@lists.01.org>,
	linux-ext4 <linux-ext4@vger.kernel.org>,
	"Linux MM" <linux-mm@kvack.org>
Subject: Re: [PATCH RFC 00/10] RDMA/FS DAX truncate proposal
Date: Thu, 13 Jun 2019 12:12:18 -0300	[thread overview]
Message-ID: <20190613151218.GB22901@ziepe.ca> (raw)
In-Reply-To: <CAPcyv4gkksnceCV-p70hkxAyEPJWFvpMezJA1rEj6TEhKAJ7qQ@mail.gmail.com>

On Wed, Jun 12, 2019 at 03:54:19PM -0700, Dan Williams wrote:
> > > My preference would be to avoid this scenario, but if it is really
> > > necessary, we could probably build it with some work.
> > >
> > > The only case we use it today is forced HW hot unplug, so it is rarely
> > > used and only for an 'emergency' like use case.
> >
> > I'd really like to avoid this as well.  I think it will be very confusing for
> > RDMA apps to have their context suddenly be invalid.  I think if we have a way
> > for admins to ID who is pinning a file the admin can take more appropriate
> > action on those processes.   Up to and including killing the process.
> 
> Can RDMA context invalidation, "device disassociate", be inflicted on
> a process from the outside? 

Yes, but it is currently only applied to the entire device - ie you do
'rmmod mlx5_ib' and all the running user space process see that their
FD has moved to some error and the device is broken.

Targetting the disassociate of only a single FD would be a new thing.

Jason

  parent reply	other threads:[~2019-06-13 15:12 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-06  1:45 [PATCH RFC 00/10] RDMA/FS DAX truncate proposal ira.weiny
2019-06-06  1:45 ` [PATCH RFC 01/10] fs/locks: Add trace_leases_conflict ira.weiny
2019-06-09 12:52   ` Jeff Layton
2019-06-06  1:45 ` [PATCH RFC 02/10] fs/locks: Export F_LAYOUT lease to user space ira.weiny
2019-06-09 13:00   ` Jeff Layton
2019-06-11 21:38     ` Ira Weiny
2019-06-12  9:46       ` Jan Kara
2019-06-06  1:45 ` [PATCH RFC 03/10] mm/gup: Pass flags down to __gup_device_huge* calls ira.weiny
2019-06-06  6:18   ` Christoph Hellwig
2019-06-06 16:10     ` Ira Weiny
2019-06-06  1:45 ` [PATCH RFC 04/10] mm/gup: Ensure F_LAYOUT lease is held prior to GUP'ing pages ira.weiny
2019-06-06  1:45 ` [PATCH RFC 05/10] fs/ext4: Teach ext4 to break layout leases ira.weiny
2019-06-06  1:45 ` [PATCH RFC 06/10] fs/ext4: Teach dax_layout_busy_page() to operate on a sub-range ira.weiny
2019-06-06  1:45 ` [PATCH RFC 07/10] fs/ext4: Fail truncate if pages are GUP pinned ira.weiny
2019-06-06 10:58   ` Jan Kara
2019-06-06 16:17     ` Ira Weiny
2019-06-06  1:45 ` [PATCH RFC 08/10] fs/xfs: Teach xfs to use new dax_layout_busy_page() ira.weiny
2019-06-06  1:45 ` [PATCH RFC 09/10] fs/xfs: Fail truncate if pages are GUP pinned ira.weiny
2019-06-06  1:45 ` [PATCH RFC 10/10] mm/gup: Remove FOLL_LONGTERM DAX exclusion ira.weiny
2019-06-06  5:52 ` [PATCH RFC 00/10] RDMA/FS DAX truncate proposal John Hubbard
2019-06-06 17:11   ` Ira Weiny
2019-06-06 19:46     ` Jason Gunthorpe
2019-06-06 10:42 ` Jan Kara
2019-06-06 15:35   ` Dan Williams
2019-06-06 19:51   ` Jason Gunthorpe
2019-06-06 22:22     ` Ira Weiny
2019-06-07 10:36       ` Jan Kara
2019-06-07 12:17         ` Jason Gunthorpe
2019-06-07 14:52           ` Ira Weiny
2019-06-07 15:10             ` Jason Gunthorpe
2019-06-12 10:29             ` Jan Kara
2019-06-12 11:47               ` Jason Gunthorpe
2019-06-12 12:09                 ` Jan Kara
2019-06-12 18:41                   ` Dan Williams
2019-06-13  7:17                     ` Jan Kara
2019-06-12 19:14                   ` Jason Gunthorpe
2019-06-12 22:13                     ` Ira Weiny
2019-06-12 22:54                       ` Dan Williams
2019-06-12 23:33                         ` Ira Weiny
2019-06-13  1:14                           ` Dan Williams
2019-06-13 15:13                             ` Jason Gunthorpe
2019-06-13 16:25                               ` Dan Williams
2019-06-13 17:18                                 ` Jason Gunthorpe
2019-06-13 16:53                           ` Dan Williams
2019-06-13 15:12                         ` Jason Gunthorpe [this message]
2019-06-13  7:53                       ` Jan Kara
2019-06-12 18:49               ` Dan Williams
2019-06-13  7:43                 ` Jan Kara
2019-06-06 22:03   ` Ira Weiny
2019-06-06 22:26     ` Ira Weiny
2019-06-06 22:28     ` Dave Chinner
2019-06-07 11:04     ` Jan Kara
2019-06-07 18:25       ` Ira Weiny
2019-06-07 18:50         ` Jason Gunthorpe
2019-06-08  0:10         ` Dave Chinner
2019-06-09  1:29           ` Ira Weiny
2019-06-12 12:37           ` Matthew Wilcox
2019-06-12 23:30             ` Ira Weiny
2019-06-13  0:55               ` Dave Chinner
2019-06-13 20:34                 ` Ira Weiny
2019-06-14  3:42                   ` Dave Chinner
2019-06-13  0:25             ` Dave Chinner
2019-06-13  3:23               ` Matthew Wilcox
2019-06-13  4:36                 ` Dave Chinner
2019-06-13 10:47                   ` Matthew Wilcox
2019-06-13 15:29                 ` Jason Gunthorpe
2019-06-13 15:27               ` Matthew Wilcox
2019-06-13 21:13                 ` Ira Weiny
2019-06-13 23:45                   ` Jason Gunthorpe
2019-06-14  0:00                     ` Ira Weiny
2019-06-14  2:09                     ` Dave Chinner
2019-06-14  2:31                       ` Matthew Wilcox
2019-06-14  3:07                         ` Dave Chinner
2019-06-20 14:52                 ` Jan Kara
2019-06-13 20:34               ` Ira Weiny
2019-06-14  2:58                 ` Dave Chinner

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