Re: Abusing region 0

[Jack Steiner <steiner@sgi.com>]

On Thu, Feb 03, 2005 at 02:03:01AM +0100, Menyhart, Zoltan wrote:
> I am going to do some experiments: I am going to map some of the
> virtual address ranges of a process into the address space of another
> one. They are real 64 bit processes, i.e. the region 0 is not used.
> Can I abuse this region 0 for mapping the addresses of the neighbor
> process into this region ? E.g. if process A has got an address at
> 0x6000000000001000, then I am going to map it for B at address
> 0x0000000000001000 ? Wont anything break ?
> 
> (I need this trick because the source address can correspond to
> anything, like initialized data, BSS, anonymous allocation, etc, i.e.
> some SHM just wont work.)
> 
> Any advice will be appreciated.

FWIW, I have done the same thing that you are trying except that I used
address 0x0000000010000000 instead of 0x0000000000001000. No problems.


> 
> Zoltan Menyhart
> 
> 
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-- 
Thanks

Jack Steiner (steiner@sgi.com)          651-683-5302
Principal Engineer                      SGI - Silicon Graphics, Inc.