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ubuntu - What is using up my RAM in VPS?

I'm running top and I see that out of 502968 KB, 48064 KB is used leaving 16884 KB free. But then when I look at the individual processes I see that mysql is consuming 9.4% of my RAM on occasion - but nothing else seems to be consuming anything. What is consuming all my RAM?



Here is a screen capture from top:




top - 20:46:07 up 1 min,  1 user,  load average: 0.18, 0.05, 0.02
Tasks:  81 total,   1 running,  80 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us,  0.4 sy,  0.0 ni, 99.6 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:    502968 total,   241236 used,   261732 free,    10488 buffers
KiB Swap:   524284 total,        0 used,   524284 free,   106756 cached

PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND
1584 dmackey   20   0 20508 1372 1000 R   0.4  0.3   0:00.01 top
1 root      20   0 26664 2456 1340 S   0.0  0.5   0:00.69 init

2 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kthreadd
3 root      20   0     0    0    0 S   0.0  0.0   0:00.01 ksoftirqd/0
4 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/0:0
5 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kworker/0:0H
6 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/u:0
7 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kworker/u:0H
8 root      rt   0     0    0    0 S   0.0  0.0   0:00.00 migration/0
9 root      20   0     0    0    0 S   0.0  0.0   0:00.00 rcu_bh
10 root      20   0     0    0    0 S   0.0  0.0   0:00.24 rcu_sched
11 root      rt   0     0    0    0 S   0.0  0.0   0:00.00 watchdog/0

12 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 cpuset
13 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 khelper
14 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kdevtmpfs
15 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 netns
16 root      20   0     0    0    0 S   0.0  0.0   0:00.00 bdi-default


And here is one from free:



            total       used       free     shared    buffers     cached

Mem:        502968     355252     147716          0      10816     111548
-/+ buffers/cache:     232888     270080
Swap:       524284          0     524284

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