Re: [Engine-devel] What BlockMigrationOnSwapUsagePercentage
On 06/14/2012 04:59 PM, Mark Wu wrote:
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 /
analyzing this...
how much memory swap has
minus
how much is still available
gives the amount of swap used
then subtract the amount of RAM available - since it won't require swap
for that amount of RAM.
that's gives how much swap is used (taking into consideration available
RAM) as a percentage from physical memory
yes, could be written in a more readable way.
physical_mem_mb) <= Config
.<Integer> GetValue(ConfigValues.BlockMigrationOnSwapUsagePercentage);
So anyone can help me explain it? Thanks a lot!
Mark.
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