Re: Limiting malloc to the low 2GB?

[christos%astron.com@localhost (Christos Zoulas)]

In article <Y4SqNvBsRZ1dCDuU%pony.stderr.spb.ru@localhost>,
Valery Ushakov  <uwe%stderr.spb.ru@localhost> wrote:
>Do we have a way to tell malloc on a 32-bit system to allocate memory
>only below the 2GB boundary (on i386, including when run under amd64)?
>I'm trying to port a(n old) program that wants to use the sign bit for
>its internal purposes.  I guess one option would be to prevent malloc
>from using mmap (and disable alsr?) so that only sbrk (in the low 2GB)
>is used.
>
>Suggestions are appreciated.

Perhaps this is also affected by uvm TOPDOWN. I think that this might
need kernel support...

christos