cmma - Reduce hypervisor paging I/O overhead

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Red Hat Enterprise Linux 9.2 z/VM guest

Use the cmma= kernel parameter to reduce hypervisor paging I/O overhead.

You can use Collaborative Memory Management Assist (CMMA, or "cmm2") on all IBM® mainframe systems that Red Hat® Enterprise Linux® 9.2 supports. With this support, the z/VM® control program and guest virtual machines can communicate attributes for specific 4K-byte blocks of guest memory. This exchange of information helps both the z/VM host and the guest virtual machines to optimize their use and management of memory.

Format

Figure 1. cmma syntax

1! cmma=
2.1 yes
2.1 on
1? cmma=
2.1 no
2.1 off

Examples

This specification disables the CMMA support:
      cmma=off
Alternatively, you can use the following specification to disable the CMMA support:
      cmma=no