cmma - Reduce hypervisor paging I/O overhead

Edit online

SUSE Linux Enterprise Server 15 SP5 z/VM guest

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

With Collaborative Memory Management Assist (CMMA, or "cmm2") 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