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Is it possible to pin VM memory so that host will never page out?


Motohiro Kanda

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Hi,

 

Is it possible to pin, page fix,  VM memory so that host will never page out any part of the memory used by an specific VM?

Kvm has "Locked" memory specification. https://libvirt.org/formatdomain.html#memory-backing 

Our customer runs kinda real-time application and cannot tolerate paging delays on VM and host.

 

It looks vm-memory-static-range-set does not help.

 

Thanks in advance.

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Far as I know, only CPUs can be pinned, not memory. You could under-allocate how many VMs run on a particular server and give thta VM plenty of memory to avoid paging.

It may also be possible to create a RAM drive or shmem but if the power fails. it will be lost.

Not sure if this might work, as I have never tried it, but see section 8.3.2.2 here: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html-single/virtualization_tuning_and_optimization_guide/index

 

-=Tobias

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