From: Khalid Aziz <khalid.aziz@oracle.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: willy@infradead.org, aneesh.kumar@linux.ibm.com, arnd@arndb.de,
21cnbao@gmail.com, corbet@lwn.net, dave.hansen@linux.intel.com,
david@redhat.com, ebiederm@xmission.com, hagen@jauu.net,
jack@suse.cz, keescook@chromium.org, kirill@shutemov.name,
kucharsk@gmail.com, linkinjeon@kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, longpeng2@huawei.com, luto@kernel.org,
markhemm@googlemail.com, pcc@google.com, rppt@kernel.org,
sieberf@amazon.com, sjpark@amazon.de, surenb@google.com,
tst@schoebel-theuer.de, yzaikin@google.com
Subject: Re: [PATCH v2 0/9] Add support for shared PTEs across processes
Date: Wed, 6 Jul 2022 13:26:59 -0600 [thread overview]
Message-ID: <9f8bb458-439d-a10d-dde4-077bb28c702b@oracle.com> (raw)
In-Reply-To: <20220701212403.77ab8139b6e1aca87fae119e@linux-foundation.org>
On 7/1/22 22:24, Andrew Morton wrote:
> On Wed, 29 Jun 2022 16:53:51 -0600 Khalid Aziz <khalid.aziz@oracle.com> wrote:
>
>> This patch series implements a mechanism in kernel to allow
>> userspace processes to opt into sharing PTEs. It adds a new
>> in-memory filesystem - msharefs.
>
> Dumb question: why do we need a new filesystem for this? Is it not
> feasible to permit PTE sharing for mmaps of tmpfs/xfs/ext4/etc files?
Hi Andrew,
The new filesystem is meant to provide only the control files for sharing PTE. It contains a file that provides
alignment/size requirement. Other files are created as named objects to represent shared regions and these files provide
information about the size and virtual address for each shared regions when the file is read. Actual shared data is not
hosted on msharefs. Actual data is mmap'ed using anonymous pages, ext4/xfs/btfrfs/etc files.
Thanks,
Khalid
next prev parent reply other threads:[~2022-07-06 19:27 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-29 22:53 [PATCH v2 0/9] Add support for shared PTEs across processes Khalid Aziz
2022-06-29 22:53 ` [PATCH v2 1/9] mm: Add msharefs filesystem Khalid Aziz
2022-06-30 21:53 ` Darrick J. Wong
2022-07-01 16:05 ` Khalid Aziz
2022-06-30 22:57 ` Al Viro
2022-07-01 16:08 ` Khalid Aziz
2022-06-29 22:53 ` [PATCH v2 2/9] mm/mshare: pre-populate msharefs with information file Khalid Aziz
2022-06-30 21:37 ` Darrick J. Wong
2022-06-30 22:54 ` Khalid Aziz
2022-06-30 23:01 ` Al Viro
2022-07-01 16:11 ` Khalid Aziz
2022-06-29 22:53 ` [PATCH v2 3/9] mm/mshare: make msharefs writable and support directories Khalid Aziz
2022-06-30 21:34 ` Darrick J. Wong
2022-06-30 22:49 ` Khalid Aziz
2022-06-30 23:09 ` Al Viro
2022-07-02 0:22 ` Khalid Aziz
2022-06-29 22:53 ` [PATCH v2 4/9] mm/mshare: Add a read operation for msharefs files Khalid Aziz
2022-06-30 21:27 ` Darrick J. Wong
2022-06-30 22:27 ` Khalid Aziz
2022-06-29 22:53 ` [PATCH v2 5/9] mm/mshare: Add vm flag for shared PTE Khalid Aziz
2022-06-30 14:59 ` Mark Hemment
2022-06-30 15:46 ` Khalid Aziz
2022-06-29 22:53 ` [PATCH v2 6/9] mm/mshare: Add mmap operation Khalid Aziz
2022-06-30 21:44 ` Darrick J. Wong
2022-06-30 23:30 ` Khalid Aziz
2022-06-29 22:53 ` [PATCH v2 7/9] mm/mshare: Add unlink and munmap support Khalid Aziz
2022-06-30 21:50 ` Darrick J. Wong
2022-07-01 15:58 ` Khalid Aziz
2022-06-29 22:53 ` [PATCH v2 8/9] mm/mshare: Add basic page table sharing support Khalid Aziz
2022-07-07 9:13 ` Xin Hao
2022-07-07 15:33 ` Khalid Aziz
2022-06-29 22:54 ` [PATCH v2 9/9] mm/mshare: Enable mshare region mapping across processes Khalid Aziz
2022-06-30 11:57 ` [PATCH v2 0/9] Add support for shared PTEs " Mark Hemment
2022-06-30 15:39 ` Khalid Aziz
2022-07-02 4:24 ` Andrew Morton
2022-07-06 19:26 ` Khalid Aziz [this message]
2022-07-08 11:47 ` David Hildenbrand
2022-07-08 19:36 ` Khalid Aziz
2022-07-13 14:00 ` David Hildenbrand
2022-07-13 17:58 ` Mike Kravetz
2022-07-13 18:03 ` David Hildenbrand
2022-07-14 22:02 ` Khalid Aziz
2022-07-18 12:59 ` David Hildenbrand
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