There are a couple of interesting line items in the code drop of this day from IBM:
- Add z/VM discontiguous saved segments (DCSS) block device driver - can you say shared R/O filesystem in storage! - Support for the z/VM recording system services: The *LOGREC system service - Add collaborative memory mangement interface: A kernel interface to reduce the memory size of the system. This is accomplished by allocating pages of memory and put them "on hold". This only makes sense for a system running under VM where the unused pages will be reused by VM for other guest systems. The interface allows an external monitor to balance memory of many systems. This feature also includes an IUCV special message interface to cooperative memory management as well as a /proc interface. - Add virtual timer interface: I'm not exactly sure what this provides. - Add Linux - z/VM monitor stream: Perform the function of my cp device driver that generates monitor records in the kernel. CPU, memory and Network records can be generated by the kernel. Question: can an application program create event records. - The HBA stuff looks interesting as a base for third-parties to add their SAN management tools to Linux/390.
