Vmware, Inc.

Microsoft Technology Licensing, LLC

Pin Lu

Irfan Ahmad

Kiran Tati

Carl Alan Waldspurger

Alexander T Garthwaite

Yi Li

Ashish Consul

Yanbiao Zhao

Jianyong Xiao

Xun Kang

Activity level of memory pages is classified in virtual machine environment, so that processes such as live VM migration and checkpointing, among others, can be carried out more efficiently. The method includes the steps of scanning page table entries of hypervisor-managed page tables continuously over repeating scan periods to determine whether memory pages have been accessed or not, and for each memory page, determining an activity level of the memory page based on whether the memory page has been accessed or not since a prior scan and storing the activity level of the memory page. The activity level of the memory page may be represented by one or more bits of its page table entry and may be classified as having at least two states ranging from hot to cold.

Online classification of memory pages based on activity level represented by one or more bits

Multiple search indexes can be served from a common set of resources. Instead of requiring a processor to be dedicated to serving a single search index, a processor can provide responsive documents for search queries that are based on different ranking algorithms and/or different sets of documents.

Serving multiple search indexes

Activity level of memory pages is repeatedly classified in a virtual machine environment, so that live VM migration can be carried out more efficiently. The time intervals upon which the activity level of the memory pages are repeatedly classified can be dynamically adjusted to better align its performance with the live VM migration process.

Online classification of memory pages based on activity level using dynamically adjustable scan rates

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Pin Lu