[Xen-devel] [PATCH v6 0/1] introduce vnuma for Xen guests

[Elena Ufimtseva <ufimtseva@xxxxxxxxx>]

xen: vnuma for PV guests

This patch is an addition to Xen vNUMA implementation posted
to xen-devel mailing list.

The patchset introduces vNUMA for paravirtualized Xen guests.
Xen subop hypercall is used to retreive vnuma topology information.
Bases on the retreived topology from Xen, NUMA number of nodes,
memory ranges, distance table and cpumask is being set.
If initialization is incorrect, sets 'dummy' node and unsets
nodemask.

vNUMA topology that exposed to guest is a structure with following
fields:
    number of vNUMA nodes;
    number of vcpus;
    distance table;
    vnodes memory sizes;
    vcpus to vnodes mapping;

Subop hypercall XENMEM_gevnumainfo is called to get the information about
vNUMA topology. Before calling it, guest should provide number of  
of nr_nodes and nr_cpus to hypervisor to prevent overflows. Hypervisor also
copies back number of vnodes and vcpus that were copied to the guest.

This patch is available here:
https://git.gitorious.org/vnuma/linux_vnuma.git
git://gitorious.org/vnuma/linux_vnuma.git

Patchset for Xen is available here:
https://git.gitorious.org/vnuma/xen_vnuma.git
git://gitorious.org/vnuma/xen_vnuma.git

Example of vnuma enabled pv domain with 4 nodes and 4 cpus boot:

[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x00001000-0x0009ffff]
[    0.000000]   node   0: [mem 0x00100000-0xffffffff]
[    0.000000]   node   1: [mem 0x100000000-0x1ffffffff]
[    0.000000]   node   2: [mem 0x200000000-0x2ffffffff]
[    0.000000]   node   3: [mem 0x300000000-0x3ffffffff]
[    0.000000] On node 0 totalpages: 1048479
[    0.000000]   DMA zone: 56 pages used for memmap
[    0.000000]   DMA zone: 21 pages reserved
[    0.000000]   DMA zone: 3999 pages, LIFO batch:0
[    0.000000]   DMA32 zone: 14280 pages used for memmap
[    0.000000]   DMA32 zone: 1044480 pages, LIFO batch:31
[    0.000000] On node 1 totalpages: 1048576
[    0.000000]   Normal zone: 14336 pages used for memmap
[    0.000000]   Normal zone: 1048576 pages, LIFO batch:31
[    0.000000] On node 2 totalpages: 1048576
[    0.000000]   Normal zone: 14336 pages used for memmap
[    0.000000]   Normal zone: 1048576 pages, LIFO batch:31
[    0.000000] On node 3 totalpages: 1048576
[    0.000000]   Normal zone: 14336 pages used for memmap
[    0.000000]   Normal zone: 1048576 pages, LIFO batch:31
[    0.000000] SFI: Simple Firmware Interface v0.81 http://simplefirmware.org
[    0.000000] smpboot: Allowing 4 CPUs, 0 hotplug CPUs
[    0.000000] No local APIC present
[    0.000000] APIC: disable apic facility
[    0.000000] APIC: switched to apic NOOP
[    0.000000] nr_irqs_gsi: 16
[    0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000fffff]
[    0.000000] e820: cannot find a gap in the 32bit address range
[    0.000000] e820: PCI devices with unassigned 32bit BARs may break!
[    0.000000] e820: [mem 0x400100000-0x4004fffff] available for PCI devices
[    0.000000] Booting paravirtualized kernel on Xen
[    0.000000] Xen version: 4.4-unstable (preserve-AD)
[    0.000000] setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:4 
nr_node_ids:4
[    0.000000] PERCPU: Embedded 28 pages/cpu @ffff8800ffc00000 s85376 r8192 
d21120 u2097152
[    0.000000] pcpu-alloc: s85376 r8192 d21120 u2097152 alloc=1*2097152


numactl output:

root@heatpipe:~# numactl --hardware
available: 4 nodes (0-3)
node 0 cpus: 0
node 0 size: 4031 MB
node 0 free: 3997 MB
node 1 cpus: 1
node 1 size: 4039 MB
node 1 free: 4022 MB
node 2 cpus: 2
node 2 size: 4039 MB
node 2 free: 4023 MB
node 3 cpus: 3
node 3 size: 3975 MB
node 3 free: 3963 MB
node distances:
node   0   1   2   3
  0:  10  20  20  20
  1:  20  10  20  20
  2:  20  20  10  20
  3:  20  20  20  10

Elena Ufimtseva (1):
  xen: vnuma for pv guests

 arch/x86/include/asm/xen/vnuma.h |   10 ++++
 arch/x86/mm/numa.c               |    3 +
 arch/x86/xen/Makefile            |    1 +
 arch/x86/xen/setup.c             |    6 +-
 arch/x86/xen/vnuma.c             |  120 ++++++++++++++++++++++++++++++++++++++
 include/xen/interface/memory.h   |   50 ++++++++++++++++
 6 files changed, 189 insertions(+), 1 deletion(-)
 create mode 100644 arch/x86/include/asm/xen/vnuma.h
 create mode 100644 arch/x86/xen/vnuma.c

-- 
1.7.10.4


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