From: Florian Weimer <fweimer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Brian Geffon <bgeffon-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Cc: Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
"Michael S . Tsirkin"
<mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
Andrea Arcangeli
<aarcange-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Sonny Rao <sonnyrao-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Minchan Kim <minchan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Joel Fernandes
<joel-QYYGw3jwrUn5owFQY34kdNi2O/JbrIOy@public.gmane.org>,
Yu Zhao <yuzhao-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Jesse Barnes <jsbarnes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
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-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org> (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
2020-01-27 4:46 ` Dan Carpenter
[not found] ` <20200123014627.71720-1-bgeffon-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2020-01-23 3:02 ` Andy Lutomirski
2020-01-23 19:03 ` Brian Geffon
2020-01-24 19:06 ` [PATCH v2] " Brian Geffon
[not found] ` <20200124190625.257659-1-bgeffon-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
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
[not found] ` <CADyq12xCK_3MhGi88Am5P6DVZvrW8vqtyJMHO0zjNhvhYegm1w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
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
[not found] ` <CADyq12x98QspiWSqNui1OH8+FEUzVyJwxia+ho00S2+Q+PmTjw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-02-10 10:35 ` Kirill A. Shutemov
2020-01-27 10:13 ` Florian Weimer [this message]
[not found] ` <87imkxxl5d.fsf-fjB847h8rq1N9UpBYOmNkhcY2uh10dtjAL8bYrjMMd8@public.gmane.org>
2020-01-27 22:33 ` Brian Geffon
[not found] ` <CADyq12xCpTzLpYC16FjnM60tHhCfnccNfg6JJuqcBd_6ACDGcQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-01-30 12:19 ` Florian Weimer
2020-01-27 5:30 ` [PATCH v3] " Brian Geffon
[not found] ` <20200127053056.213679-1-bgeffon-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2020-01-28 15:26 ` Will Deacon
2020-01-30 10:12 ` Will Deacon
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