[Engine-devel] What BlockMigrationOnSwapUsagePercentage

Hi guys I got the following error message when I tried to run a VM: "VM's swap percentage is above the threshold. (check your configuration parameters for Host Swap Percentage)." After increasing the parameter BlockMigrationOnSwapUsagePercentage, the problem disappeared. But I don't understand the logic here: IsVMSwapValueLegal .... return ((swap_total - swap_free - mem_available) * 100 / physical_mem_mb) <= Config .<Integer> GetValue(ConfigValues.BlockMigrationOnSwapUsagePercentage); So anyone can help me explain it? Thanks a lot! Mark.