Virtualize, checkpoint, and restart system V IPC objects during checkpointing and restarting of a software partition

A computer program product for migrating a workload partition, the computer program product comprising:

• a computer recordable storage medium having computer usable program code tangibly embodied thereon, the computer usable program code comprising:
• computer usable program code for, responsive to receiving a request to checkpoint the workload partition on a first data processing system, generating, by a checkpoint process, a list of a set of virtual identifiers used by the workload partition to refer to a set of inter-process communication (IPC) objects, wherein each virtual identifier of the set of virtual identifiers corresponds to an IPC object of the set of IPC objects and to a real identifier used by a kernel that corresponds to the IPC object, wherein the list comprises all the virtual identifiers for at least one of IPC semaphore objects of the workload partition, IPC message queue objects of the workload partition, and IPC shared memory objects of the workload partition;
• computer usable program code for storing the list in a data repository;
• computer usable program code for storing attributes for each one of IPC semaphore objects, IPC message queue objects, and IPC shared memory objects on the list in a data structure
• computer usable program code for collecting IPC object data and control information for each IPC object in the list, forming collected data;
• computer usable program code for storing the collected data in the data repository;
• computer usable program code for storing, by each process in the workload partition, per process data in the data repository;
• computer usable program code for, responsive to receiving a request to restart the workload partition on a second data processing system, registering, by a restart process, the virtual identifier stored in the data repository that the workload partition wants to be used for a new IPC object to be created on the second data processing system to form a registered virtual identifier;
• computer usable program code for creating the new IPC object by a kernel on the second data processing system;
• computer usable program code for mapping, by the kernel, a real identifier used by the kernel associated with the new IPC object to the registered virtual identifier;
• computer usable program code for retrieving, by the restart process, the collected data from the data repository associated with the registered virtual identifier;
• computer usable program code for overlaying the collected data on the new IPC object;
• and
• computer usable program code for restoring per process data from the data repository of each process in the workload partition.

A data processing system for migrating a workload partition, the data processing system comprising:

• a bus;
• a storage device connected to the bus, wherein the storage device contains computer usable code;
• and
• a processing unit connected to the bus, wherein the processing unit executes the computer usable code to:
• responsive to receiving a request to checkpoint the workload partition on a first data processing system, generate, by a checkpoint process, a list of a set of virtual identifiers used by the workload partition to refer to a set of inter-process communication (IPC) objects, wherein each virtual identifier of the set of set of virtual identifiers corresponds to an IPC object of the set of IPC objects and to a real identifier used by a kernel that corresponds to the IPC object, wherein the list comprises all the virtual identifiers for at least one of IPC semaphore objects of the workload partition, IPC message queue objects of the workload partition, and IPC shared memory objects of the workload partition;
• store the list in a data repository;
• store attributes for each one of IPC semaphore objects, IPC message queue objects, and IPC shared memory objects on the list in a data structure;
• collect IPC object data and control information for each IPC object in the list, forming collected data;
• store the collected data in the data repository;
• store, by each process in the workload partition, per process data in the data repository;
• responsive to receiving a request to restart the workload partition on a second data processing system, register, by a restart process, the virtual identifier stored in the data repository that the workload partition wants to be used for a new IPC object to be created on the second data processing system to form a registered virtual identifier;
• create the new IPC object by a kernel on the second data processing system;
• map, by the kernel, a real identifier used by the kernel associated with the new IPC object to the registered virtual identifier;
• retrieve, by the restart process, the collected data from the data repository associated with the registered virtual identifier;
• overlay the collected data on the new IPC object;
• restore per process data from the data repository each process in the workload partition.