Query about process address space

[Hayawardh V]

Hi,

generally the text segment of the program gets mapped into the virtual
address starting at
0x8048000 ....

but in the case of certain programs like sshd, apache, postgres, when
I examine the proc/pid/maps, I get that the program is mapped higher
in memory (ie) in the mmap space.
eg: cat /proc/sshd/maps

...
b7fd2000-b7fd3000 r--p 0001a000 08:01 5144607    /lib/ld-2.8.90.so
b7fd3000-b7fd4000 rw-p 0001b000 08:01 5144607    /lib/ld-2.8.90.so
b7fd4000-b8038000 r-xp 00000000 08:01 656219     /usr/sbin/sshd
b8039000-b803a000 r--p 00064000 08:01 656219     /usr/sbin/sshd
b803a000-b803b000 rw-p 00065000 08:01 656219     /usr/sbin/sshd
b803b000-b8040000 rw-p 00000000 00:00 0
b8779000-b87be000 rw-p 00000000 00:00 0          [heap]
bfeed000-bff02000 rw-p 00000000 00:00 0          [stack]

(on linux-2.6.30)

This seems to be the mmap space. Why do programs mmap themselves in
higher memory? Or is there some other reason and is this not the mmap space?

Thanks,
Hayawardh
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