libvirt users - Oct 2015 - How to find memory utilization percent of kvm guest?

I currently use following approach but its failing


Find Max memory using following API

        vdgiRet = virDomainGetInfo(domPtr, infoPtr);
        memTotal = infoPtr->memory;


Find current utilization using following API
        
        rVal = virDomainMemoryStats (domPtr, memStats,
VIR_DOMAIN_MEMORY_STAT_NR, 0) ;
        for (i = 0; i < rVal; i++) 
        {
            if (memStats[i].tag == 7)
                memUsed = memStats[i].val;
        }

Which is the value of "VIR_DOMAIN_MEMORY_STAT_RSS    =    7"



Then I calculate util as (memUsed/memTotal)

But the value of memUsed exceeds value of memTotal by small amount resulting in
memUtil to be around 101 %.

I understand that VIR_DOMAIN_MEMORY_STAT_RSS is Resident Set Size of the process
running the domain.


How do I Calculate the current memory utilization using alternate way?