From: Florian Weimer <fweimer@redhat.com>
To: Michal Hocko <mhocko@kernel.org>
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 15:16:09 +0200 [thread overview]
Message-ID: <765cd0cb-aa35-187c-456d-05d8752caa04@redhat.com> (raw)
In-Reply-To: <20170925125207.4tu24sbpnihljknu@dhcp22.suse.cz>
On 09/25/2017 02:52 PM, Michal Hocko wrote:
> So, how are you going to deal with the CoW and the implementation which
> basically means that the newm mmap content is not the same as the
> original one?
I don't understand why CoW would kick in. The approach I outlined is
desirable because it avoids the need to modify any executable pages, so
this is not a concern. The point is to create a potentially unbounded
number of thunks *without* run-time code generation.
If the file is rewritten on disk, that's already undefined today, so
it's not something we need to be concerned with. (Anything which
replaces ELF files needs to use the rename-into-place approach anyway.)
Thanks,
Florian
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next prev parent reply other threads:[~2017-09-25 13:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-15 21:37 [patch] mremap.2: Add description of old_size == 0 functionality Mike Kravetz
2017-09-15 21:53 ` Mike Kravetz
[not found] ` <a6e59a7f-fd15-9e49-356e-ed439f17e9df-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2017-09-18 13:45 ` Florian Weimer
2017-09-18 17:11 ` Mike Kravetz
[not found] ` <ee87215d-9704-7269-4ec1-226f2e32a751-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2017-09-19 12:11 ` Florian Weimer
2017-09-19 21:42 ` [patch v2] " Mike Kravetz
[not found] ` <20170919214224.19561-1-mike.kravetz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2017-09-20 7:25 ` Michael Kerrisk (man-pages)
[not found] ` <6fafdae8-4fea-c967-f5cd-d22c205608fa-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-09-25 12:36 ` Michal Hocko
2017-09-25 12:40 ` Michael Kerrisk (man-pages)
2017-09-25 16:33 ` Mike Kravetz
[not found] ` <83b023da-e9f5-2957-981e-5b0e71e9bf1b-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2017-09-25 19:26 ` Michael Kerrisk (man-pages)
[not found] ` <a5d279cb-a015-f74c-2e40-a231aa7f7a8c-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-09-25 12:35 ` [patch] " Michal Hocko
2017-09-25 12:40 ` Florian Weimer
2017-09-25 12:52 ` Michal Hocko
2017-09-25 13:16 ` Florian Weimer [this message]
[not found] ` <765cd0cb-aa35-187c-456d-05d8752caa04-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-09-25 14:52 ` Michal Hocko
2017-09-25 14:54 ` Florian Weimer
[not found] ` <20170915213745.6821-1-mike.kravetz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2017-09-18 1:52 ` Jann Horn
2017-09-18 17:19 ` Mike Kravetz
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