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1. (WO2015045046) COMPUTER SYSTEM AND MEMORY ALLOCATION ADJUSTMENT METHOD FOR COMPUTER SYSTEM

Pub. No.:    WO/2015/045046    International Application No.:    PCT/JP2013/075977
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Fri Sep 27 01:59:59 CEST 2013
IPC: G06F 12/10
G06F 9/46
G06F 9/50
G06F 12/02
G06F 12/08
Applicants: HITACHI, LTD.
株式会社日立製作所
Inventors: TAJIMA, Sachie
田島 幸恵
TAKEUCHI, Tadashi
竹内 理
Title: COMPUTER SYSTEM AND MEMORY ALLOCATION ADJUSTMENT METHOD FOR COMPUTER SYSTEM
Abstract:
In a computer system in which a virtualization control unit controls a plurality of virtual machines, if memory is reclaimed regardless of the utilization of the memory by the virtual machines, cache misses will increase, resulting in degradation of the I/O performance of the entire system. In order to solve this problem, the utilization of the cache regions of the memory by the OSs of the plurality of virtual machines is monitored, and, based on the monitoring results, the virtualization control unit determines, from among the memory allocation regions that have already been allocated to the OSs, the memory allocation regions to be reclaimed, and reclaims the memory allocation regions to be reclaimed from the respective OSs.