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
WARNING: multiple messages have this Message-ID (diff)
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: 41+ 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 1:46 ` Brian Geffon
2020-01-27 4:46 ` Dan Carpenter
2020-01-27 4:46 ` Dan Carpenter
2020-01-27 4:46 ` Dan Carpenter
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 3:02 ` Andy Lutomirski
2020-01-23 18:47 ` Lokesh Gidra
2020-01-23 19:02 ` Brian Geffon
2020-01-23 19:03 ` Brian Geffon
2020-01-24 19:06 ` [PATCH v2] " Brian Geffon
2020-01-24 19:06 ` Brian Geffon
[not found] ` <20200124190625.257659-1-bgeffon-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2020-01-26 5:16 ` Nathan Chancellor
2020-01-26 5:16 ` Nathan Chancellor
2020-01-27 2:21 ` Brian Geffon
2020-01-27 2:21 ` Brian Geffon
2020-01-26 22:06 ` Kirill A. Shutemov
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
2020-01-29 10:46 ` Kirill A. Shutemov
2020-02-01 21:03 ` Brian Geffon
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
2020-02-10 10:35 ` Kirill A. Shutemov
2020-01-27 10:13 ` Florian Weimer [this message]
2020-01-27 10:13 ` Florian Weimer
[not found] ` <87imkxxl5d.fsf-fjB847h8rq1N9UpBYOmNkhcY2uh10dtjAL8bYrjMMd8@public.gmane.org>
2020-01-27 22:33 ` Brian Geffon
2020-01-27 22:33 ` Brian Geffon
[not found] ` <CADyq12xCpTzLpYC16FjnM60tHhCfnccNfg6JJuqcBd_6ACDGcQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-01-30 12:19 ` Florian Weimer
2020-01-30 12:19 ` Florian Weimer
2020-01-27 5:30 ` [PATCH v3] " Brian Geffon
2020-01-27 5:30 ` Brian Geffon
[not found] ` <20200127053056.213679-1-bgeffon-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2020-01-28 15:26 ` Will Deacon
2020-01-28 15:26 ` Will Deacon
2020-01-30 10:12 ` Will Deacon
2020-01-30 10:12 ` Will Deacon
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87imkxxl5d.fsf@oldenburg2.str.redhat.com \
--to=fweimer-h+wxahxf7alqt0dzr+alfa@public.gmane.org \
--cc=aarcange-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
--cc=akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org \
--cc=arnd-r2nGTMty4D4@public.gmane.org \
--cc=bgeffon-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
--cc=joel-QYYGw3jwrUn5owFQY34kdNi2O/JbrIOy@public.gmane.org \
--cc=jsbarnes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
--cc=linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org \
--cc=luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org \
--cc=minchan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
--cc=mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
--cc=sonnyrao-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
--cc=yuzhao-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.