Pager "Write System Call"
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-01
A method is described to permit the Advanced Interactive Executive (AIX*) operation system for the IBM RT PC in its virtual machine environment to write out modified, mapped pages to the appropriate disk location. On the RT PC, the AIX operating system runs in a virtual machine on top of the Virtual Resource Manager (VRM). This system runs in a virtual storage environment supported by demand paging under the control of the VRM. AIX provides a "sync" command which writes modified file system blocks out to disk. There are two types of blocks that can be written out to disk: files mapped to a disk and files which are not mapped. Mapped files are under the control of the VRM pager. Therefore, AIX only has knowledge about file system blocks which are not mapped.