RedHat Linux: server paging, sum of RES/RSS + buffers + cached < TOTAL. Who is using my memory?

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http://serverfault.com – we have a server with 8GB, running mysql, 4 java applications and a small postgres db. We're having some issues with the system paging, so in order to see what's going on we ran some commands to see how memory is being used. Now the problem is that we can't find who is using 4 of our 8 GBs. Here is the data we have: [root@server1 ~]# free -mt total used free shared buffers cached Mem: 7983 7934 49 0 65 584 -/+ buffers/cache: 7284 699 Swap: 5951 1032 4919 Total: 13935 (HowTos)