Re: WINE + NX (No eXecute) support for x86, 2.6.7-rc2-bk2

[Mike McCormack]

Ingo Molnar wrote:

> > I did not investigate this, but others who did think that it is not
> > possible to create a segment that is reserve only so that does not
> > unnecessarily consume virtual memory. Apparently ELF allows it, but
> > Linux doesn't.
>
>
> what do you mean by "Linux doesn't"?

Apparently Linux will back all segments by swap space, even if they're 
marked as non-accessable.  Maybe I was told the wrong thing?  Or maybe 
the it's just difficult to create such a segment, as Jukub was saying?

In any case, the solution we have now reserves exactly the amount of 
memory that is needed.  If we were to use a fixed size segment, we would 
be reserving too much memory most of the time, and preventing shared 
libraries being loaded at their prefered addresses.

Mike
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