qemu-kvm with rbd mem slow leak

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CPU: Intel(R) Xeon(R) CPU           E5620  @ 2.40GHz *2
MEM: 32GB
KVM: qemu-kvm-0.12.1.2-2.355.el6.2.cuttlefish.async.x86_64
Host: CentOS 6.4, kernel 2.6.32-358.14.1.el6.x86_64
Guest: CentOS 6.4, kernel 2.6.32-279.14.1.el6.x86_64
Ceph: ceph version 0.67.4 (ad85b8bfafea6232d64cb7ba76a8b6e8252fa0c7)
Opennebula: 4.2


top -M info:
top - 10:35:31 up 7 days, 9:19, 1 user, load average: 0.85, 1.63, 1.40
Tasks: 454 total,   2 running, 452 sleeping,   0 stopped,   0 zombie
Cpu(s): 8.5%us, 6.6%sy, 0.0%ni, 84.2%id, 0.6%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 32865800k total, 32191072k used, 674728k free, 59984k buffers
Swap: 10485752k total, 10134076k used,   351676k free,  3474176k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
20135 oneadmin  20   0 6381m 3.4g 9120 S  2.3 10.8 104:00.48 qemu-kvm
29171 oneadmin  20   0 6452m 3.2g 9072 S  2.0 10.2 168:02.06 qemu-kvm
 8857 oneadmin  20   0 6338m 2.9g 4504 S  2.3  9.3 289:14.48 qemu-kvm
12283 oneadmin  20   0 6591m 2.9g 4464 S  1.3  9.2 268:57.30 qemu-kvm
 6612 oneadmin  20   0 5050m 2.0g 4472 S 12.9  6.3 191:23.51 qemu-kvm
12006 oneadmin  20   0 5532m 1.9g 4468 S  4.3  6.1 236:43.50 qemu-kvm
 7216 oneadmin  20   0 3600m 1.9g 4680 S  1.3  6.1 159:40.53 qemu-kvm
10602 oneadmin  20   0 5333m 1.6g 4636 S  1.3  5.1 208:54.52 qemu-kvm
13162 oneadmin  20   0 3400m 989m 4528 S 50.3  3.1   4151:19 qemu-kvm
 5273 oneadmin  20   0 5168m 842m 4464 S  5.3  2.6 468:20.65 qemu-kvm
 6287 oneadmin  20   0 3150m 761m 4472 S 37.4  2.4 150:32.89 qemu-kvm
 6081 root      20   0 1732m 504m 5744 S  6.3  1.6 243:17.00 ceph-osd
11729 oneadmin  20   0 3541m 498m 4468 S  0.7  1.6  66:48.52 qemu-kvm
12503 oneadmin  20   0 3832m 428m 9336 S  0.3  1.3  19:58.78 qemu-kvm


such as 20135 process command line:
ps -ef | grep 20135
oneadmin 20135 1 2 Oct11 ? 01:44:01 /usr/libexec/qemu-kvm -name one-18 -S -M rhel6.4.0 -enable-kvm -m 2048 -smp 2,sockets=2,cores=1,threads=1 -uuid c40fe8a4-f4fa-9e02-cf2d-6eaaf5062440 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/one-18.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=rbd:one/one-0-18-0:auth_supported=none,if=none,id=drive-virtio-disk0,format=raw,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive file=rbd:one/one-2:auth_supported=none,if=none,id=drive-virtio-disk1,format=raw,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk1,id=virtio-disk1 -drive file=/var/lib/one/datastores/0/18/disk.1,if=none,media=cdrom,id=drive-ide0-0-0,readonly=on,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev tap,fd=22,id=hostnet0,vhost=on,vhostfd=27 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=02:00:c0:a8:0a:3b,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -vnc 0.0.0.0:18 -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6

I have only give it 2GB,but as you see, VIRT/RES (6381m/3.4g).

I think it must be mem leak.

could any one give me a hand?

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