es/disclaim_threshold_MB 
Use
This parameter is used to control the release of SAP Extended Memory for the operating system.
For more information see Release of SAP Memory for the Operating System.
Features
This parameter determines the threshold value in MB. If memory blocks are requested above this threshold, for instance when there is a high load, these blocks are released for the operating system at the same time as they are released for the SAP system.
A value of 0 means that this parameter is inactive. This is also the default setting.
See also:
es/disclaim_coasting_time_alloc
es/disclaim_coasting_time_free