On 8/14/23 02:09, Yan Zhao wrote:
...
hmm_range_fault()-based memory management in particular might benefit
from having NUMA balancing disabled entirely for the memremap_pages()
region, come to think of it. That seems relatively easy and clean at
first glance anyway.
For other regions (allocated by the device driver), a per-VMA flag
seems about right: VM_NO_NUMA_BALANCING ?
Thanks a lot for those good suggestions!
For VMs, when could a per-VMA flag be set?
Might be hard in mmap() in QEMU because a VMA may not be used for DMA until
after it's mapped into VFIO.
Then, should VFIO set this flag on after it maps a range?
Could this flag be unset after device hot-unplug?
I'm hoping someone who thinks about VMs and VFIO often can chime in.
thanks,
--
John Hubbard
NVIDIA
