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Date: Thu, 13 Jun 2019 12:12:18 -0300 From: Jason Gunthorpe <jgg@...pe.ca> To: Dan Williams <dan.j.williams@...el.com> Cc: Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu>, Jeff Layton <jlayton@...nel.org>, Dave Chinner <david@...morbit.com>, Matthew Wilcox <willy@...radead.org>, linux-xfs <linux-xfs@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, John Hubbard <jhubbard@...dia.com>, Jérôme Glisse <jglisse@...hat.com>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-nvdimm <linux-nvdimm@...ts.01.org>, linux-ext4 <linux-ext4@...r.kernel.org>, Linux MM <linux-mm@...ck.org> Subject: Re: [PATCH RFC 00/10] RDMA/FS DAX truncate proposal 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
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