Ballon memory usage

[Trigve]

Hi,
I have a debian 7.11 guest using KVM and have a "balloon" memory set for it. The problem is, that the RAM usage in proxmox is always at max. If i run free -m from the guest I see the half of the memory is cached.

# free -m
             total       used       free     shared    buffers     cached
Mem:          3968       3818        149          0        391       2859
-/+ buffers/cache:        568       3400
Swap:         1905          0       1905

It is somehow possible to show only the real usage of the memory (without the cached) from the proxmox? Because I cannot otherwise tell if the VM does need more memory or not. The one option is to use cron to purge the memory, but I don't like the solution.

Thanks

 

[dcsapak]

since the host cannot know what the guest does with the memory, i don't think we can show the "real" value