A data processing system includes a global promotion facility containing a plurality
of promotion bit fields, an interconnect, and a plurality of processing units coupled
to the global promotion facility and to the interconnect. A first processing unit
includes an instruction sequencing unit, an execution unit that executes an acquisition
instruction to acquire a particular promotion bit field within the global promotion
facility, and a promotion awareness facility. In response to the first processing
unit snooping a request by a second processing unit for the particular promotion
bit field, the first processing unit records an association between the second
processing unit and the particular promotion bit field in the global promotion
facility. After the request and release of the particular promotion bit field by
the first processing unit, the first processing unit checks the promotion awareness
facility for an association for the particular promotion bit and responsive to
the checking, pushes the particular promotion bit field to the second processing
unit utilizing an unsolicited operation on the interconnect such that no additional
request by the second processing unit is required.