linux-kernel - Re: RFC: named anonymous vmas

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Message-ID: <51E1F769.7090208@gmail.com>
Date:	Sun, 14 Jul 2013 08:57:13 +0800
From:	Sam Ben <sam.bennn@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	Alex Elsayed <eternaleye@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: RFC: named anonymous vmas

Hi Christoph,
On 06/24/2013 07:48 PM, Christoph Hellwig wrote:
> On Sat, Jun 22, 2013 at 12:47:29PM -0700, Alex Elsayed wrote:
>> Couldn't this be done by having a root-only tmpfs, and having a userspace
>> component that creates per-app directories with restrictive permissions on
>> startup/app install? Then each app creates files in its own directory, and
>> can pass the fds around.
> Honestly having a device that allows passing fds around that can be
> mmaped sounds a lot simpler.  I have to admit that I expect /dev/zero
> to do this, but looking at the code it creates new file structures
> at ->mmap time which would defeat this.

Could you point out where done this?

>
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