Page buffering in a virtualized, memory sharing configuration

A method comprising:

• booting up a computer device, wherein the booting up includes executing instructions that instantiate a virtual input/output (I/O) server having a reserved memory section in a volatile memory of the computer device;
• after booting up the computer device, a virtual machine monitor,
• receiving a first request to store a first data in the volatile memory from a first virtual machine;
• storing the first data in a shared memory section of the volatile memory, in response to the first request;
• receiving a second request to store a second data in the volatile memory from a second virtual machine;
• and
• responsive to determining that a size of the second data is greater than a size of available memory space in the shared memory section in the volatile memory,
• paging out the first data stored in the shared memory section in the volatile memory to the reserved memory section in the volatile memory;
• and
• storing the second data in the shared memory section in the volatile memory.

A computer program product for memory sharing, the computer program product comprising:

• a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code configured to,
• receive a first request to store a first data in the volatile memory by a first virtual machine;
• store the first data in a shared memory section of the volatile memory, in response to the first request;
• receive a second request to store a second data in the volatile memory by a second virtual machine;
• and
• in response to a determination that a size of the second data is greater than a size of available storage in the shared memory section in the volatile memory,
• page out the first data stored in the shared memory section in the volatile memory to a reserved memory section in the volatile memory, wherein the reserved memory section is assigned to only be accessible by a module configured to control access to physical resources of a computer on which the computer program product is configured to execute;
• and
• store the second data in the shared memory section in the volatile memory.

A computer program product for memory sharing, the computer program product comprising:

• a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code configured to,
• boot up a computer device, wherein the boot up includes executing instructions that instantiate a virtual input/output (I/O) server having a reserved memory section in a volatile memory of the computer device;
• after boot up of the computer device, receive a first request to store a first data in the volatile memory by
• a first virtual machine;
• store the first data in a shared memory section of the volatile memory, in response to the first request;
• receive a second request to store a second data in the volatile memory by a second virtual machine;
• and
• in response to a determination that a size of the second data is greater than a size of available storage in the shared memory section in the volatile memory,
• page out the first data stored in the shared memory section in the volatile memory to the reserved memory section in the volatile memory;
• and
• store the second data in the shared memory section in the volatile memory.