Hi,
who can pick this set up?
Thanks,
Wanlong Gao
> As you know, QEMU can't direct it's memory allocation now, this may cause
> guest cross node access performance regression.
> And, the worse thing is that if PCI-passthrough is used,
> direct-attached-device uses DMA transfer between device and qemu process.
> All pages of the guest will be pinned by get_user_pages().
>
> KVM_ASSIGN_PCI_DEVICE ioctl
> kvm_vm_ioctl_assign_device()
> =>kvm_assign_device()
> => kvm_iommu_map_memslots()
> => kvm_iommu_map_pages()
> => kvm_pin_pages()
>
> So, with direct-attached-device, all guest page's page count will be +1 and
> any page migration will not work. AutoNUMA won't too.
>
> So, we should set the guest nodes memory allocation policy before
> the pages are really mapped.
>
> According to this patch set, we are able to set guest nodes memory policy
> like following:
>
> -numa node,nodeid=0,mem=1024,cpus=0,mem-policy=membind,mem-hostnode=0-1
> -numa node,nodeid=1,mem=1024,cpus=1,mem-policy=interleave,mem-hostnode=1
>
> This supports
> "mem-policy={membind|interleave|preferred},mem-hostnode=[+|!]{all|N-N}" like
> format.
>
> And patch 8/10 adds a QMP command "set-mpol" to set the memory policy for
> every
> guest nodes:
> set-mpol nodeid=0 mem-policy=membind mem-hostnode=0-1
>
> And patch 9/10 adds a monitor command "set-mpol" whose format like:
> set-mpol 0 mem-policy=membind,mem-hostnode=0-1
>
> And with patch 10/10, we can get the current memory policy of each guest node
> using monitor command "info numa", for example:
>
> (qemu) info numa
> 2 nodes
> node 0 cpus: 0
> node 0 size: 1024 MB
> node 0 mempolicy: membind=0,1
> node 1 cpus: 1
> node 1 size: 1024 MB
> node 1 mempolicy: interleave=1
>
>
> V1->V2:
> change to use QemuOpts in numa options (Paolo)
> handle Error in mpol parser (Paolo)
> change qmp command format to mem-policy=membind,mem-hostnode=0-1 like
> (Paolo)
> V2->V3:
> also handle Error in cpus parser (5/10)
> split out common parser from cpus and hostnode parser (Bandan 6/10)
>
>
> Bandan Das (1):
> NUMA: Support multiple CPU ranges on -numa option
>
> Wanlong Gao (9):
> NUMA: Add numa_info structure to contain numa nodes info
> NUMA: Add Linux libnuma detection
> NUMA: parse guest numa nodes memory policy
> NUMA: handle Error in cpus, mpol and hostnode parser
> NUMA: split out the common range parser
> NUMA: set guest numa nodes memory policy
> NUMA: add qmp command set-mpol to set memory policy for NUMA node
> NUMA: add hmp command set-mpol
> NUMA: show host memory policy info in info numa command
>
> configure | 32 ++++++
> cpus.c | 143 +++++++++++++++++++++++-
> hmp-commands.hx | 16 +++
> hmp.c | 35 ++++++
> hmp.h | 1 +
> hw/i386/pc.c | 4 +-
> hw/net/eepro100.c | 1 -
> include/sysemu/sysemu.h | 20 +++-
> monitor.c | 44 +++++++-
> qapi-schema.json | 15 +++
> qemu-options.hx | 3 +-
> qmp-commands.hx | 35 ++++++
> vl.c | 285
> +++++++++++++++++++++++++++++++++++-------------
> 13 files changed, 553 insertions(+), 81 deletions(-)
>
