Memory reclaim management for virtual machines

摘要

System for for managing host reclaimable memory based on VM needs includes a plurality of VMs; a hypervisor configured to process VM memory requests; a host CPU configured to control host physical memory reclaim process; at least one VM being allocated physical memory; Guest tool configured to determine page types based on a memory map; and a host module configured to scan an LRU list for pages that it can reacquire, and to force a slowdown in VM operations when reclaim operations use up more than a predefined share of CPU time. The host CPU performs the following based on the page type: (i) hard lock protection, when the page is a VM kernel page, for host-based reclaim of the page when no other VM pages are left to reacquire; and (ii) access/dirty (A/D) bit marking, when the page is a regular VM page.