RES! = CODE + DATA в выходной информации верхней команды, почему?

"man top" сказал: RES = CODE + DATA

q: RES -- Resident size (kb)
The non-swapped physical memory a task has used.
RES = CODE + DATA.

r: CODE -- Code size (kb)
The amount of physical memory devoted to executable code, also known as the 'text        resident set' size or TRS.

s: DATA -- Data+Stack size (kb)
The amount of physical memory devoted to other than executable code, also known as the   'data >resident set' size or DRS.

что, когда я запускаю 'top -p 4258 ', я получаю следующее:

PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  CODE DATA COMMAND
258 root      16   0  3160 1796 1328 S  0.0  0.3   0:00.10  476  416 bash

1796! = 476 + 416

почему?

ps: дистрибутив Linux:

linux-iguu:~ # lsb_release -a
LSB Version:    core-2.0-noarch:core-3.0-noarch:core-2.0-ia32:core-3.0-ia32:desktop-3.1-ia32:desktop-3.1-noarch:graphics-2.0-ia32:graphics-2.0-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: SUSE LINUX
Description:    SUSE Linux Enterprise Server 9 (i586)
Release:        9
Codename:       n/a

версия ядра:

linux-iguu:~ # uname -a
Linux linux-iguu 2.6.16.60-0.21-default #1 Tue May 6 12:41:02 UTC 2008 i686 i686 i386 GNU/Linux