Stuff

root@nixbox /opt/systemtap_scripts % cat stat_aggregates.stp  
global reads
probe vfs.read
{
        reads[execname(), pid()] <<< 1
}
probe timer.s(3)
{
        foreach([var1, var2] in reads){
                printf("%s (%d) : %d\n", var1, var2, @count(reads[var1, var2]));
        }
}