linux-kernel - Re: Execute in place

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Message-ID: <46398FCF.80100@gmail.com>
Date:	Thu, 03 May 2007 11:31:27 +0400
From:	Dmitry Krivoschekov <dmitry.krivoschekov@...il.com>
To:	Al Boldi <a1426z@...ab.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Execute in place

Al Boldi wrote:
> Hugh Dickins wrote:
>> On Wed, 2 May 2007, Phillip Susi wrote:
>>> Hugh Dickins wrote:
>>>> tmpfs doesn't store its stuff in the page cache twice: that's true,
>>>> and I didn't mean to imply otherwise.  But tmpfs doesn't contain any
>>>> support for rom memory: you'd have to copy from rom to tmpfs to use
>>>> it.
>>> The question is, when you execute a binary on tmpfs, does its code
>>> segment get mapped directly where it's at in the buffer cache, or does
>>> it get copied to another page for the executing process?  At least,
>>> assuming this is possible due to the vma and file offsets of the segment
>>> being aligned.
>> Its pages are mapped directly into the executing process, without copying.
>
> Thank GOD!  Boy, was I worried there for a second.
>
> Now, if there were only an easy way to make tmpfs persistent?
>
>

It would be not a tmpfs (*temporary* fs)then, but something like this

http://pramfs.sourceforge.net/



Regards,
Dmitry

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