spark on mesos memory sizing with offheap

[vincent gromakowski]

Hi,
I am trying to understand how mesos allocate memory when offheap is enabled
but it seems that the framework is only taking the heap + 400 MB overhead
into consideration for resources allocation.
Example: spark.executor.memory=3g spark.memory.offheap.size=1g ==> mesos
report 3.4g allocated for the executor
Is there any configuration to use both heap and offheap for mesos
allocation ?