How to find memory utilization percent of kvm guest?

[suyog jadhav <suyogjadhav@xxxxxxxxx>]

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?

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