Re: Execute in place

[Hugh Dickins <hugh@veritas.com>]

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.

Hugh