Re: [PATCH -v2 0/9] mm: make movable onlining suck less

[Igor Mammedov]

On Tue, 11 Apr 2017 11:23:07 +0200
Michal Hocko <mhocko@xxxxxxxxxx> wrote:

> On Tue 11-04-17 08:38:34, Igor Mammedov wrote:
> > for issue2:
> > -enable-kvm -m 2G,slots=4,maxmem=4G -smp 4 -numa node -numa node \
> > -drive if=virtio,file=disk.img -kernel bzImage -append 'root=/dev/vda1' \
> > -object memory-backend-ram,id=mem1,size=256M -object memory-backend-ram,id=mem0,size=256M \
> > -device pc-dimm,id=dimm1,memdev=mem1,slot=1,node=0 -device pc-dimm,id=dimm0,memdev=mem0,slot=0,node=1  
> 
> I must be doing something wrong here...
> qemu-system-x86_64 -enable-kvm -monitor telnet:127.0.0.1:9999,server,nowait -net nic -net user,hostfwd=tcp:127.0.0.1:5555-:22 -serial file:test.qcow_serial.log -enable-kvm -m 2G,slots=4,maxmem=4G -smp 4 -numa node -numa node -object memory-backend-ram,id=mem1,size=256M -object memory-backend-ram,id=mem0,size=256M -device pc-dimm,id=dimm1,memdev=mem1,slot=1,node=0 -device pc-dimm,id=dimm0,memdev=mem0,slot=0,node=1 -drive file=test.qcow,if=ide,index=0
> 
> for i in $(seq 0 3)
> do
> 	sh probe_memblock.sh $i
> done
dimm to node mapping comes from ACPI subsystem (_PXM object in memory device),
which adds memory blocks automatically on hotplug.

you probably don't have ACPI_HOTPLUG_MEMORY config option enabled.

> 
> # ls -l /sys/devices/system/memory/memory3?/node*
> lrwxrwxrwx 1 root root 0 Apr 11 11:21 /sys/devices/system/memory/memory32/node0 -> ../../node/node0
> lrwxrwxrwx 1 root root 0 Apr 11 11:21 /sys/devices/system/memory/memory33/node0 -> ../../node/node0
> lrwxrwxrwx 1 root root 0 Apr 11 11:21 /sys/devices/system/memory/memory34/node0 -> ../../node/node0
> lrwxrwxrwx 1 root root 0 Apr 11 11:21 /sys/devices/system/memory/memory35/node0 -> ../../node/node0
> 
> all of them end in the same node0
> 
> # grep . /sys/devices/system/memory/memory3?/valid_zones
> /sys/devices/system/memory/memory32/valid_zones:Normal Movable
> /sys/devices/system/memory/memory33/valid_zones:Normal Movable
> /sys/devices/system/memory/memory34/valid_zones:Normal Movable
> /sys/devices/system/memory/memory35/valid_zones:Normal Movable
>