From: Christopher Lameter <cl@linux.com>
To: Eric Wheeler <linux-mm@lists.ewheeler.net>
Cc: linux-mm@kvack.org
Subject: Re: Copy-on-write with vmalloc
Date: Mon, 14 May 2018 15:34:18 +0000 [thread overview]
Message-ID: <010001635f49bc45-0b91dd16-c92d-4bcd-985f-1cc57ca9e438-000000@email.amazonses.com> (raw)
In-Reply-To: <alpine.LRH.2.11.1805072224360.31774@mail.ewheeler.net>
On Mon, 7 May 2018, Eric Wheeler wrote:
> I would like to clone a virtual address space so that the address spaces
> share physical pages until a write happens, at which point it would copy
> to a new physical page. I've looked around and haven't found any
> documentation. Certainly fork() already does this, but is there already
> simple way to do it with a virtual address space?
The clone() syscall does it (since it is the underlying basis for fork).
The same effect can also be had by using mmap with
MAP_PRIVATE on a shared memory segment.
prev parent reply other threads:[~2018-05-14 15:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-07 22:25 Eric Wheeler
2018-05-14 15:34 ` Christopher Lameter [this message]
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