[Qemu-devel] How to monitor guest vm memory usage

[journey journey]

Hi All
Is there a tool to monitor qemu-kvm guest vm memory usage ( free in guest 
vm)?Nowadays, I have already researched some methods:1. qemu-kvm process memory 
usage.     Since qemu-kvm process memory usage always increases as time goes 
on, it will not reflect the memory usage in vm.2. virsh dommemstat     Just as 
method 1.3. virsh qemu-monitor-command --hmp [domain name] "info mem"     (1) 
when guest vm memory size less than 4Gbytes, it will output something like 
this:            7f882000-7f883000 00001000 urw            7fbf8000-7fbf9000 
00001000 urw            88000000-88001000 00001000 -rw            
88002000-88003000 00001000 urw            88004000-88005000 00001000 urw        
    c9000000-c9001000 00001000 urw            e8bfe000-e8bff000 00001000 urw    
        ea000000-ea001000 00001000 urw            ffbfc000-ffbfd000 00001000 
-rw            ffbfe000-ffbff000 00001000 urw           it shows pde info of 
PG_PRESENT_MASK, maybe has some relation with guest vm memory usage.      (2) 
when guest vm memory size larger than 4Gbytes, it will output noting.
Please help!!