Abstract: Methods and systems for sharing memory pages in virtual machines are described. Guest memory pages are identified as candidate memory pages. The candidate memory pages are hashed and the hash results of the candidate memory pages are compared. A determination is made on whether a hash match exists between a first candidate memory page and a second candidate memory page. If it is determined that a hash match exists, an anonymous memory page that includes the information of candidate memory pages is created and shared. As a result, embodiments effectively reduce memory overheads by, in one example, exposing a single anonymous memory page to multiple virtual machines.

Abstract: Methods for logging and replaying input/output (I/O) events for a virtual machine (VM). The I/O events may be asynchronous or synchronous. In particular, one embodiment is a computer-implemented method for logging input/output (I/O) events for a virtual machine, the method including: executing the virtual machine from a checkpoint; and logging external events, including I/O events; wherein logging an I/O event comprises logging the event, and then, logging I/O data relating to the I/O event.

Abstract: Methods for logging and replaying input/output (I/O) events for a virtual machine (VM). The I/O events may be asynchronous or synchronous. In particular, one embodiment is a computer-implemented method for logging input/output (I/O) events for a virtual machine, the method including: executing the virtual machine from a checkpoint; and logging external events, including I/O events; wherein logging an I/O event comprises logging the event, and then, logging I/O data relating to the I/O event.