Reserving fixed page areas in real storage increments

摘要

Embodiments of the disclosure include a method for reserving large pages in a large frame area (LFAREA) of a main memory. The method includes pre-scanning a plurality of storage increments and counting a number of available large pages that are online and issuing a message that indicates the number of available large pages. The method also includes receiving and parsing an LFAREA request including a target number of large pages to be reserved. The method further includes calculating an optimal number of large pages to be reserved, based upon the target number of available pages and a system limit. The method includes determining if the LFAREA request is valid and if the LFAREA request can be satisfied and scanning the plurality of the storage increments and reserving the optimal number of pages in the LFAREA.

主权项

1. A method for reserving a first size page and a second size page in a large frame area (LFAREA) of a main memory, the main memory including a plurality of storage increments, the method comprising:
pre-scanning, by a processor, the plurality of storage increments and counting a number of available first size pages and second size pages in the plurality of storage increments that are online; issuing a message that indicates the number of available first size pages and second size pages; receiving and parsing an LFAREA request, wherein the LFAREA request includes a target number of first size pages and second size pages; calculating an optimal number of first size and second size pages to be reserved, based upon the target number of first size pages and second size pages, the number of available first size pages and second size pages and a system limit; determining if the LFAREA request is valid and if the LFAREA request can be satisfied; and based upon determining that the LFAREA request is valid and that the LFAREA request can be satisfied, scanning the plurality of the storage increments and reserving the optimal number of first size and second size pages in the LFAREA.