Mysql

one of our servers is memory usage is very high and hard to track it down.

[]# mysqladmin pr
+-------+------+-----------+----+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+-------+------+-----------+----+---------+------+-------+------------------+
| 29045 | root | localhost | | Query | 0 | | show processlist |
+-------+------+-----------+----+---------+------+-------+------------------+

Loook at the memory usage.

]# free -m
total used free shared buffers cached
Mem: 1003 988 14 0 20 85

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1262 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:03.83 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1263 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:00.00 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1264 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:10.37 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1269 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:25.82 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1339 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:36.99 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1344 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:26.47 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1349 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:41.44 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1397 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:27.28 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1398 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:27.71 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1401 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:37.15 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1403 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:20.32 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1410 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:23.28 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1411 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:17.13 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1412 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:16.82 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1413 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:25.30 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1449 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:31.98 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
11205 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:21.92 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
11219 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:32.17 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
10073 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:09.14 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
10074 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:19.78 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
10075 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:23.84 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
22902 slackers 16 0 30420 20m 2028 S 0.0 2.1 0:23.25 spamd child

how to track it down?