From: David Hildenbrand <david@redhat.com>
To: William Kucharski <kucharsk@gmail.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Khalid Aziz <khalid.aziz@oracle.com>,
akpm@linux-foundation.org, willy@infradead.org,
longpeng2@huawei.com, arnd@arndb.de, dave.hansen@linux.intel.com,
rppt@kernel.org, surenb@google.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [RFC PATCH 0/6] Add support for shared PTEs across processes
Date: Tue, 25 Jan 2022 14:18:57 +0100 [thread overview]
Message-ID: <fccf697d-919e-8e99-ea08-3ab991b610eb@redhat.com> (raw)
In-Reply-To: <E44A9AB1-DBF0-4B8E-B049-293DD4DE6093@gmail.com>
On 25.01.22 13:09, William Kucharski wrote:
> I would think this should be the case; certainly it seems to be a more effective approach than having to manually enable sharing via the API in every case or via changes to ld.so.
>
> If anything it might be useful to have an API for shutting it off, though there are already multiple areas where the system shares resources in ways that cannot be shut off by user action.
>
I don't have time to look into details right now, but I see various
possible hard-to-handle issues with sharing anon pages via this
mechanism between processes. If we could restrict it to MAP_SHARED and
have some magic toggle to opt in, that would be great. Features like
uffd that we might soon see on some MAP_SHARED pages will require to not
share page tables automatically I assume.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2022-01-25 13:19 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 [this message]
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
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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