Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1989-06-21
1992-04-28
Fears, Terrell W.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
3612282, 3612302, 361280, 3612808, G06F 100
Patent
active
051094894
ABSTRACT:
In a virtual machine system (VMS) capable of concurrently running at least one operating system (OS) under one real computer system and a control program (VMCP) for controlling the VMS, the object is to reduce the overhead produced for simulating VM I/Os by direct I/O execution. A VM information area of a real sub-channel control block has a status field in which a flag indicating that the sub-channel is dedicated or not is contained. When the flag is "1", it means that the sub-channel is dedicated to the VM and the sub-channel scheduling by the VMCP is not necessary. As a real interruption priority order is dedicated to a VM, only I/O interruption requests of the VM are queued into the real interruption request queue of that dedicated priority order, and the mixing of VMs in that real interruption priority order is avoided. When an interruption control mask of an interruption priority order of the OS on the VM is "0" indicating that the interruption is not acceptable by the VM, the interruption conrol mask of the corresponding dedicated real interruption priority order is also "0" and the hardware interruption does not take place. Accordingly, the interruption is retained by the hardware and the I/O interruption retention for the VM by the VMCP is avoided.
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Hagiwara Nobutaka
Kubo Takashige
Sato Hiroaki
Sawamoto Hideo
Umeno Hidenori
Fears Terrell W.
Hitachi , Ltd.
Rudolph Rebecca L.
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