[Qemu-devel] Kvm qemu dirty page log facility

[hellen maziku]

Greetings!
I am new to kvm qemu and are writing a python script to get the number of 
pre-copy cycles during a remote vm migration given memory size M  of a VM in 
MB, the page dirty rate R of a vm in MB/s. My question is on 
how to get the page dirty rate. Does kvm qemu provide a dirty page 
log facility that provides user space with a bitmap of modified pages 
since the last call? And if yes, please kindly direct me on how to get 
started. I have searched and come across things like 


kvm_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log, int *is_dirty), 

I do not know if this is the one and if yes how I can use it or ways to 
implement it. 

Thank you very much