From: Mike Rapoport <rppt@kernel.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: David Hildenbrand <david@redhat.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Khalid Aziz <khalid.aziz@oracle.com>,
akpm@linux-foundation.org, longpeng2@huawei.com, arnd@arndb.de,
dave.hansen@linux.intel.com, surenb@google.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Peter Xu <peterx@redhat.com>
Subject: Re: [RFC PATCH 0/6] Add support for shared PTEs across processes
Date: Wed, 26 Jan 2022 16:12:18 +0200 [thread overview]
Message-ID: <YfFWwjzSLsZ0aV6W@kernel.org> (raw)
In-Reply-To: <YfFO6VyMTrW1bWuu@casper.infradead.org>
On Wed, Jan 26, 2022 at 01:38:49PM +0000, Matthew Wilcox wrote:
> On Wed, Jan 26, 2022 at 11:16:42AM +0100, David Hildenbrand wrote:
> > A while ago I talked with Peter about an extended uffd (here: WP)
> > mechanism that would work on fds instead of the process address space.
>
> As far as I can tell, uffd is a grotesque hack that exists to work around
> the poor choice to use anonymous memory instead of file-backed memory
> in kvm. Every time I see somebody mention it, I feel pain.
How file-backed memory would have helped for the major use-case of uffd
which is post-copy migration?
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2022-01-26 14:12 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-18 21:19 [RFC PATCH 0/6] Add support for shared PTEs across processes Khalid Aziz
2022-01-18 21:19 ` [RFC PATCH 1/6] mm: Add new system calls mshare, mshare_unlink Khalid Aziz
2022-01-18 21:19 ` [RFC PATCH 2/6] mm: Add msharefs filesystem Khalid Aziz
2022-01-18 21:19 ` [RFC PATCH 3/6] mm: Add read for msharefs Khalid Aziz
2022-01-18 21:19 ` [RFC PATCH 4/6] mm: implement mshare_unlink syscall Khalid Aziz
2022-01-18 21:19 ` [RFC PATCH 5/6] mm: Add locking to msharefs syscalls Khalid Aziz
2022-01-18 21:19 ` [RFC PATCH 6/6] mm: Add basic page table sharing using mshare Khalid Aziz
2022-01-18 21:41 ` [RFC PATCH 0/6] Add support for shared PTEs across processes Dave Hansen
2022-01-18 21:46 ` Matthew Wilcox
2022-01-18 22:47 ` Khalid Aziz
2022-01-18 22:06 ` Dave Hansen
2022-01-18 22:52 ` Khalid Aziz
2022-01-19 11:38 ` Mark Hemment
2022-01-19 17:02 ` Khalid Aziz
2022-01-20 12:49 ` Mark Hemment
2022-01-20 19:15 ` Khalid Aziz
2022-01-24 15:15 ` Mark Hemment
2022-01-24 15:27 ` Matthew Wilcox
2022-01-24 22:20 ` Khalid Aziz
2022-01-21 1:08 ` Barry Song
2022-01-21 2:13 ` Matthew Wilcox
2022-01-21 7:35 ` Barry Song
2022-01-21 14:47 ` Matthew Wilcox
2022-01-21 16:41 ` Khalid Aziz
2022-01-22 1:39 ` Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2022-01-22 1:41 ` Matthew Wilcox
2022-01-22 10:18 ` Thomas Schoebel-Theuer
2022-01-22 16:09 ` Matthew Wilcox
2022-01-22 11:31 ` Mike Rapoport
2022-01-22 18:29 ` Andy Lutomirski
2022-01-24 18:48 ` Khalid Aziz
2022-01-24 19:45 ` Andy Lutomirski
2022-01-24 22:30 ` Khalid Aziz
2022-01-24 23:16 ` Andy Lutomirski
2022-01-24 23:44 ` Khalid Aziz
2022-01-25 11:42 ` Kirill A. Shutemov
2022-01-25 12:09 ` William Kucharski
2022-01-25 13:18 ` David Hildenbrand
2022-01-25 14:01 ` Kirill A. Shutemov
2022-01-25 13:23 ` Matthew Wilcox
2022-01-25 13:59 ` Kirill A. Shutemov
2022-01-25 14:09 ` Matthew Wilcox
2022-01-25 18:57 ` Kirill A. Shutemov
2022-01-25 18:59 ` Matthew Wilcox
2022-01-26 4:04 ` Matthew Wilcox
2022-01-26 10:16 ` David Hildenbrand
2022-01-26 13:38 ` Matthew Wilcox
2022-01-26 13:55 ` David Hildenbrand
2022-01-26 14:12 ` Matthew Wilcox
2022-01-26 14:30 ` David Hildenbrand
2022-01-26 14:12 ` Mike Rapoport [this message]
2022-01-26 13:42 ` Kirill A. Shutemov
2022-01-26 14:18 ` Mike Rapoport
2022-01-26 17:33 ` Khalid Aziz
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