From: Florian Weimer <fweimer@redhat.com>
To: Brian Geffon <bgeffon@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"Michael S . Tsirkin" <mst@redhat.com>,
Arnd Bergmann <arnd@arndb.de>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-api@vger.kernel.org, Andy Lutomirski <luto@amacapital.net>,
Andrea Arcangeli <aarcange@redhat.com>,
Sonny Rao <sonnyrao@google.com>, Minchan Kim <minchan@kernel.org>,
Joel Fernandes <joel@joelfernandes.org>,
Yu Zhao <yuzhao@google.com>, Jesse Barnes <jsbarnes@google.com>
Subject: Re: [PATCH v2] mm: Add MREMAP_DONTUNMAP to mremap().
Date: Mon, 27 Jan 2020 11:13:02 +0100 [thread overview]
Message-ID: <87imkxxl5d.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <20200124190625.257659-1-bgeffon@google.com> (Brian Geffon's message of "Fri, 24 Jan 2020 11:06:25 -0800")
* Brian Geffon:
> When remapping an anonymous, private mapping, if MREMAP_DONTUNMAP is
> set, the source mapping will not be removed. Instead it will be
> cleared as if a brand new anonymous, private mapping had been created
> atomically as part of the mremap() call. If a userfaultfd was watching
> the source, it will continue to watch the new mapping. For a mapping
> that is shared or not anonymous, MREMAP_DONTUNMAP will cause the
> mremap() call to fail. MREMAP_DONTUNMAP implies that MREMAP_FIXED is
> also used. The final result is two equally sized VMAs where the
> destination contains the PTEs of the source.
What will be the protection flags of the source mapping? Will they
remain unchanged? Or PROT_NONE?
Thanks,
Florian
next prev parent reply other threads:[~2020-01-27 10:13 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-23 1:46 [PATCH] mm: Add MREMAP_DONTUNMAP to mremap() Brian Geffon
2020-01-23 3:02 ` Andy Lutomirski
2020-01-23 19:03 ` Brian Geffon
2020-01-24 19:06 ` [PATCH v2] " Brian Geffon
2020-01-26 5:16 ` Nathan Chancellor
2020-01-27 2:21 ` Brian Geffon
2020-01-26 22:06 ` Kirill A. Shutemov
2020-01-28 1:35 ` Brian Geffon
2020-01-29 10:46 ` Kirill A. Shutemov
2020-02-01 21:03 ` Brian Geffon
2020-02-02 4:17 ` Brian Geffon
2020-02-03 13:09 ` Kirill A. Shutemov
2020-02-07 20:42 ` Brian Geffon
2020-02-10 10:35 ` Kirill A. Shutemov
2020-01-27 10:13 ` Florian Weimer [this message]
2020-01-27 22:33 ` Brian Geffon
2020-01-30 12:19 ` Florian Weimer
2020-01-27 4:46 ` [PATCH] " Dan Carpenter
2020-01-27 5:30 ` [PATCH v3] " Brian Geffon
2020-01-28 15:26 ` Will Deacon
2020-01-30 10:12 ` Will Deacon
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