From: Michal Hocko <mhocko@kernel.org>
To: Florian Weimer <fweimer@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>,
mtk.manpages@gmail.com, linux-man@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
Andrea Arcangeli <aarcange@redhat.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Vlastimil Babka <vbabka@suse.cz>,
Anshuman Khandual <khandual@linux.vnet.ibm.com>,
linux-mm@kvack.org
Subject: Re: [patch] mremap.2: Add description of old_size == 0 functionality
Date: Mon, 25 Sep 2017 14:35:08 +0200 [thread overview]
Message-ID: <20170925123508.pzjbe7wgwagnr5li@dhcp22.suse.cz> (raw)
In-Reply-To: <a5d279cb-a015-f74c-2e40-a231aa7f7a8c@redhat.com>
On Tue 19-09-17 14:11:19, Florian Weimer wrote:
> On 09/18/2017 07:11 PM, Mike Kravetz wrote:
[...]
> > I can drop this wording, but would still like to suggest memfd_create as
> > the preferred method of creating duplicate mappings. It would be good if
> > others on Cc: could comment as well.
>
> mremap seems to work with non-anonymous mappings, too:
only for shared mappings in fact. Because once we have CoW then mremap
will not provide you with the same content as the original mapping.
[...]
> > Just curious, does glibc make use of this today? Or, is this just something
> > that you think may be useful.
>
> To my knowledge, we do not use this today. But it certainly looks very
> useful.
What would be the usecase. I mean why don't you simply create a new
mapping by a plain mmap when you have no guarantee about the same
content?
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2017-09-25 12:35 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170915213745.6821-1-mike.kravetz@oracle.com>
2017-09-15 21:53 ` Mike Kravetz
2017-09-18 13:45 ` Florian Weimer
2017-09-18 17:11 ` Mike Kravetz
2017-09-19 12:11 ` Florian Weimer
2017-09-19 21:42 ` [patch v2] " Mike Kravetz
2017-09-20 7:25 ` Michael Kerrisk (man-pages)
2017-09-25 12:36 ` Michal Hocko
2017-09-25 12:40 ` Michael Kerrisk (man-pages)
2017-09-25 16:33 ` Mike Kravetz
2017-09-25 19:26 ` Michael Kerrisk (man-pages)
2017-09-25 12:35 ` Michal Hocko [this message]
2017-09-25 12:40 ` [patch] " Florian Weimer
2017-09-25 12:52 ` Michal Hocko
2017-09-25 13:16 ` Florian Weimer
2017-09-25 14:52 ` Michal Hocko
2017-09-25 14:54 ` Florian Weimer
2017-09-18 1:52 ` Jann Horn
2017-09-18 17:19 ` Mike Kravetz
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