linux-kernel - Re: Execute in place

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Message-ID: <4638E6E6.90206@cfl.rr.com>
Date:	Wed, 02 May 2007 15:30:46 -0400
From:	Phillip Susi <psusi@....rr.com>
To:	Hugh Dickins <hugh@...itas.com>
CC:	Björn Steinbrink <B.Steinbrink@....de>,
	Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Execute in place

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.
> 
> Hugh

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.
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