top에서보면 RSS가 계속 증가하는데... 왜그러는거죠?

98 processes: 97 sleeping, 1 running, 0 zombie, 0 stopped
CPU0 states: 0.3% user, 0.2% system, 0.0% nice, 99.0% idle
CPU1 states: 0.2% user, 0.3% system, 0.0% nice, 99.0% idle
Mem: 1030648K av, 1020572K used, 10076K free, 0K shrd, 101676K buff
Swap: 819304K av, 50844K used, 768460K free 662164K cached

PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
18215 nobody 12 0 16684 15M 3428 S 0.3 1.5 0:55 libhttpd.ep
8 root 10 0 0 0 0 SW 0.1 0.0 12:10 kscand/HighMem
18203 nobody 11 0 18916 17M 3428 S 0.1 1.7 0:41 libhttpd.ep
18204 nobody 15 0 17068 16M 3428 S 0.1 1.5 0:43 libhttpd.ep
18205 nobody 11 0 18464 17M 3476 S 0.1 1.7 0:46 libhttpd.ep
18207 nobody 10 0 18476 17M 3476 S 0.1 1.7 0:43 libhttpd.ep
19077 root 10 0 1764 1724 1368 S 0.1 0.1 0:00 sshd
19932 root 11 0 944 944 728 R 0.1 0.0 0:00 top
1 root 8 0 112 68 48 S 0.0 0.0 0:08 init
2 root 9 0 0 0 0 SW 0.0 0.0 0:01 keventd
3 root 19 19 0 0 0 SWN 0.0 0.0 0:00 ksoftirqd_CPU0
4 root 19 19 0 0 0 SWN 0.0 0.0 0:00 ksoftirqd_CPU1
5 root 9 0 0 0 0 SW 0.0 0.0 6:03 kswapd
6 root 9 0 0 0 0 SW 0.0 0.0 0:34 kscand/DMA
7 root 9 0 0 0 0 SW 0.0 0.0 7:47 kscand/Normal
9 root 9 0 0 0 0 SW 0.0 0.0 0:00 bdflush
10 root 9 0 0 0 0 SW 0.0 0.0 0:06 kupdated
11 root -1 -20 0 0 0 SW< 0.0 0.0 0:00 mdrecoveryd
20 root 9 0 0 0 0 SW 0.0 0.0 0:19 kjournald
95 root 9 0 0 0 0 SW 0.0 0.0 0:00 khubd
157 root 9 0 0 0 0 SW 0.0 0.0 0:00 kjournald
158 root 9 0 0 0 0 SW 0.0 0.0 0:20 kjournald
559 root 9 0 248 220 164 S 0.0 0.0 0:04 syslogd
564 root 9 0 100 40 36 S 0.0 0.0 0:00 klogd
650 root 9 0 436 324 224 S 0.0 0.0 0:05 sshd

이게 제 서버의 top에서 볼때의 목록입니다.

위에서 libhttpd.ep 이 프로세서의 RSS가 지금은 17M인데...

처음 아파치를 구동시켰을때는 11M였습니다...

나중에는 50M까지 가더군요...

RSS가 도대체 뭔지???

그리구 저렇게 증가하는게 맞는지 궁금합니다;;

답변좀 부탁드리겠습니다~ ^^;;