Management of low-paging space conditions in an operating system

A virtual memory management unit can implement various techniques for managing paging space. The virtual memory management unit can monitor a number of unallocated large sized pages and can determine when the number of unallocated large sized pages drops below a page threshold. Unallocated contiguous smaller-sized pages can be aggregated to obtain unallocated larger-sized pages, which can then be allocated to processes as required to improve efficiency of disk I/O operations. Allocated smaller-sized pages can also be reorganized to obtain the unallocated contiguous smaller-sized pages that can then be aggregated to yield the larger-sized pages. If allocated smaller-sized pages belonging to a second process cannot be de-allocated by reorganizing, the second process can be terminated to de-allocate the pages. Furthermore, content can also be compressed before being written to the paging space to reduce the number of pages that are to be allocated to processes.