公开(公告)号：BR8700152A

公开(公告)日：1987-12-01

申请号：BR8700152

申请日：1987-01-15

Applicant: IBM

Inventor： DUVALL KEITH ELLIOTT ,  HOOTEN ANTHONY DANA ,  LOUCKS LARRY KEITH

IPC: G06F9/46 ,  G06F9/48 ,  G06F12/08 ,  G06F12/10

Abstract: Copy-on-write segment sharing is accommodated in a virtual memory virtual machine data processing system in which a Virtual Resource Manager establishes virtual machines which execute at least one UNIX type operating system which includes SHMAT type System Calls to permit a file to be concurrently shared by more than one user. An improved System Call is provided to create a copy-on-write type file that can be shared. A mapped file type segment is established and provides two special fields in the map node data structure that function to control the concurrent use of the copy-on-write segment by multiple users.

公开(公告)号：DE3751645D1

公开(公告)日：1996-02-08

申请号：DE3751645

申请日：1987-01-08

Applicant: IBM

Inventor： DUVALL KEITH ELLIOTT ,  HOOTEN ANTHONY DANA ,  LOUCKS LARRY KEITH

IPC: G06F9/46 ,  G06F9/48 ,  G06F12/08 ,  G06F12/10

Abstract: Copy-on-write segment sharing is accommodated in a virtual memory virtual machine data processing system in which a Virtual Resource Manager establishes virtual machines which execute at least one UNIX type operating system which includes SHMAT type System Calls to permit a file to be concurrently shared by more than one user. An improved System Call is provided to create a copy-on-write type file that can be shared. A mapped file type segment is established and provides two special fields in the map node data structure that function to control the concurrent use of the copy-on-write segment by multiple users.

公开(公告)号：DE3751645T2

公开(公告)日：1996-07-04

申请号：DE3751645

申请日：1987-01-08

Applicant: IBM

Inventor： DUVALL KEITH ELLIOTT ,  HOOTEN ANTHONY DANA ,  LOUCKS LARRY KEITH

IPC: G06F9/46 ,  G06F9/48 ,  G06F12/08 ,  G06F12/10

Abstract: Copy-on-write segment sharing is accommodated in a virtual memory virtual machine data processing system in which a Virtual Resource Manager establishes virtual machines which execute at least one UNIX type operating system which includes SHMAT type System Calls to permit a file to be concurrently shared by more than one user. An improved System Call is provided to create a copy-on-write type file that can be shared. A mapped file type segment is established and provides two special fields in the map node data structure that function to control the concurrent use of the copy-on-write segment by multiple users.

公开(公告)号：BR8606308A

公开(公告)日：1987-10-06

申请号：BR8606308

申请日：1986-12-19

Applicant: IBM

Inventor： DUVALL KEITH ELLIOTT ,  HOOTEN ANTHONY DANA

IPC: G06F12/08 ,  G06F12/10 ,  G06F7/00

Abstract: Disclosed is I/O accessing control in a page segmented virtual memory data processing system in which virtual machines running UNIX type operating systems are concurrently established, and in which a memory manager controls the transfer of information between primary and secondary storage devices in response to the occurrence of page faults. … A plurality of data structures are established in a dynamic manner in response to a Supervisor call to "map" a file. The mapping process assigns a new segment of virtual memory to the mapped file and correlates, in one data structure, the virtual address of each page of data in the new segment to a disk file address where that page is actually stored. … A UNIX system call by an application program for a specific virtual page is handled by the page fault handler, and not the UNIX kernel, since the application can supply the real address of the page on the disk file from the data structure that is created by the mapped page range Supervisor call. … Simple load and store type of instructions are employed for the data transfer, which avoids much of the overhead that normally accompanies conventional UNIX read and write system calls to the storage subsystem.