KVM Dirty Page Log Facility

[hellen maziku]

Greetings!I am new to kvm 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 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

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

I do not know if this is what I should use and if so how  I could go about to implement it. 

Thank you very much,

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