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From: Jason Gunthorpe <jgg@nvidia.com>
To: David Hildenbrand <david@redhat.com>
Cc: Matthew Rosato <mjrosato@linux.ibm.com>,
	Christian Borntraeger <borntraeger@linux.ibm.com>,
	Lorenzo Stoakes <lstoakes@gmail.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Jens Axboe <axboe@kernel.dk>,
	Matthew Wilcox <willy@infradead.org>,
	Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>,
	Leon Romanovsky <leon@kernel.org>,
	Christian Benvenuti <benve@cisco.com>,
	Nelson Escobar <neescoba@cisco.com>,
	Bernard Metzler <bmt@zurich.ibm.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
	Ian Rogers <irogers@google.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Bjorn Topel <bjorn@kernel.org>,
	Magnus Karlsson <magnus.karlsson@intel.com>,
	Maciej Fijalkowski <maciej.fijalkowski@intel.com>,
	Jonathan Lemon <jonathan.lemon@gmail.com>,
	"David S . Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Christian Brauner <brauner@kernel.org>,
	Richard Cochran <richardcochran@gmail.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Jesper Dangaard Brouer <hawk@kernel.org>,
	John Fastabend <john.fastabend@gmail.com>,
	linux-fsdevel@vger.kernel.org, linux-perf-users@vger.kernel.org,
	netdev@vger.kernel.org, bpf@vger.kernel.org,
	Oleg Nesterov <oleg@redhat.com>,
	John Hubbard <jhubbard@nvidia.com>, Jan Kara <jack@suse.cz>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Pavel Begunkov <asml.silence@gmail.com>,
	Mika Penttila <mpenttil@redhat.com>,
	Dave Chinner <david@fromorbit.com>, Theodore Ts'o <tytso@mit.edu>,
	Peter Xu <peterx@redhat.com>
Subject: Re: [PATCH v6 3/3] mm/gup: disallow FOLL_LONGTERM GUP-fast writing to file-backed mappings
Date: Tue, 2 May 2023 10:50:58 -0300	[thread overview]
Message-ID: <ZFEVQmFGL3GxZMaf@nvidia.com> (raw)
In-Reply-To: <ad60d5d2-cfdf-df9f-aef1-7a0d3facbece@redhat.com>

On Tue, May 02, 2023 at 03:47:43PM +0200, David Hildenbrand wrote:
> > Eventually we want to implement a mechanism where we can dynamically pin in response to RPCIT.
> 
> Okay, so IIRC we'll fail starting the domain early, that's good. And if we
> pin all guest memory (instead of small pieces dynamically), there is little
> existing use for file-backed RAM in such zPCI configurations (because memory
> cannot be reclaimed either way if it's all pinned), so likely there are no
> real existing users.

Right, this is VFIO, the physical HW can't tolerate not having pinned
memory, so something somewhere is always pinning it.

Which, again, makes it weird/wrong that this KVM code is pinning it
again :\

Jason

  reply	other threads:[~2023-05-02 13:51 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-01 23:11 [PATCH v6 0/3] mm/gup: disallow GUP writing to file-backed mappings by default Lorenzo Stoakes
2023-05-01 23:11 ` [PATCH v6 1/3] mm/mmap: separate writenotify and dirty tracking logic Lorenzo Stoakes
2023-05-01 23:11 ` [PATCH v6 2/3] mm/gup: disallow FOLL_LONGTERM GUP-nonfast writing to file-backed mappings Lorenzo Stoakes
2023-05-02 15:04   ` David Hildenbrand
2023-05-02 15:17     ` Lorenzo Stoakes
2023-05-01 23:11 ` [PATCH v6 3/3] mm/gup: disallow FOLL_LONGTERM GUP-fast " Lorenzo Stoakes
2023-05-01 23:42   ` John Hubbard
2023-05-02  3:33   ` kernel test robot
2023-05-02  7:46     ` Lorenzo Stoakes
2023-05-02 11:13   ` Peter Zijlstra
2023-05-02 11:23     ` Jan Kara
2023-05-02 11:25     ` Lorenzo Stoakes
2023-05-02 11:28       ` Lorenzo Stoakes
2023-05-02 12:08       ` Peter Zijlstra
2023-05-02 12:27         ` Lorenzo Stoakes
2023-05-02 12:40         ` Peter Zijlstra
2023-05-02 12:47           ` David Hildenbrand
2023-05-02 12:52             ` Lorenzo Stoakes
2023-05-02 12:53               ` David Hildenbrand
2023-05-02 13:30         ` Paul E. McKenney
2023-05-02 11:20   ` Jan Kara
2023-05-02 12:46   ` Christian Borntraeger
2023-05-02 12:54     ` Lorenzo Stoakes
2023-05-02 13:02       ` Jason Gunthorpe
2023-05-02 13:04       ` Christian Borntraeger
2023-05-02 13:10         ` Jason Gunthorpe
2023-05-02 13:28           ` David Hildenbrand
2023-05-02 13:36             ` Jason Gunthorpe
2023-05-02 13:39               ` David Hildenbrand
2023-05-02 13:43                 ` Matthew Rosato
2023-05-02 13:47                   ` David Hildenbrand
2023-05-02 13:50                     ` Jason Gunthorpe [this message]
2023-05-02 13:56                       ` Matthew Rosato
2023-05-02 15:09                         ` David Hildenbrand
2023-05-02 15:19                           ` Lorenzo Stoakes
2023-05-02 15:20                             ` Matthew Rosato
2023-05-02 13:57                       ` David Hildenbrand
2023-05-02 14:04                         ` Jason Gunthorpe
2023-05-02 14:15                           ` David Hildenbrand
2023-05-02 14:54                             ` Matthew Rosato
2023-05-02 15:20                               ` Jason Gunthorpe
2023-05-02 15:32                                 ` Peter Xu
2023-05-02 15:36                                   ` Jason Gunthorpe
2023-05-02 15:45                                     ` David Hildenbrand
2023-05-02 16:06                                       ` Jason Gunthorpe
2023-05-02 16:12                                         ` David Hildenbrand
2023-05-02 16:19                                           ` Jason Gunthorpe
2023-05-02 16:32                                             ` David Hildenbrand
2023-05-02 17:46                                               ` Jason Gunthorpe
2023-05-02 17:59                                                 ` Matthew Rosato
2023-05-02 18:09                                                   ` Jason Gunthorpe
2023-05-02 19:23                                                 ` David Hildenbrand
2023-05-02 13:38             ` Matthew Rosato
2023-05-02 13:35         ` Matthew Rosato
2023-05-02 14:57           ` David Hildenbrand
2023-05-02 15:19             ` Matthew Rosato

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