Patent ID: 9058195
Filing Date: 2015-06-16
Classification: G06F

Abstract:
1. A method of operating a computer cluster including a first computer system including a memory storing an image of a virtual machine, at least one processor unit adapted to run the virtual machine in a first operation mode, and a multi-level cache memory system accessible to the at least one processor unit, said multi-level cache memory system including a write-back cache and a write-through cache adapted to write cache lines into the write-back cache, said method comprising: providing, for each of a plurality cache lines in the write-back cache, a respective associated one of a plurality of image modification flags indicating modification of the associated cache line caused by the running of the virtual machine, wherein the image modification flags are provided, of the write-back cache and the write-through cache, only in the write back cache; in the first operation mode, a processor unit of the first computer system: the processor unit additionally: