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[Bug 1294283] Re: Memory balloning in Hyper-V generation 2 does not work

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: nmeier <nmeier@xxxxxxxxxxxxx>
Date: Thu, 06 Aug 2015 17:03:18 -0000
Reply-to: Bug 1294283 <1294283@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Hot Add issues remain.

Memory is Hot Added as demand increases.
Memory is not ballooned down after demand is reduced.
syslog has numerous call traces for hung task.
Call stack shows calls to mem_hotplug_begin()
Tail end of syslog attached as syslog.log.

Test procedure:
  - Create 15.04 VM.
  - Install test kernel.
  - Configure dynamic memory
      - Startup memory : 1536 MB
      - Minimum memory : 1024 MB
      - Maximum memory : 8192 MB
  - Reboot
  - Start 7 separate instances of stressapptest.
      - Each instance consumes 128 MB and runs for 90 seconds.
      - Allow 5 seconds before starting a new instance.
  - Wait for Hyper-V host to balloon down assigned memory.
  - Repeat test.

Test results:

VM State      Assigned Mem      Memory Demand
========      ============      =============
Idle          1024 MB            399 MB
stress x7     1778 MB           1778 MB
no stress     1778 MB            462 MB
10 min later  1778 MB            462 MB
20 min later  1778 MB            462

** Attachment added: "Tail end of syslog - during hot add test."
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1294283/+attachment/4440536/+files/syslog.log

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https://bugs.launchpad.net/bugs/1294283

Title:
  Memory balloning in Hyper-V generation 2 does not work

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  In Progress
Status in linux source package in Utopic:
  In Progress
Status in linux source package in Vivid:
  In Progress
Status in linux source package in Wily:
  In Progress

Bug description:
  The generation 2 VM has been assinged a memory range of 512 MiB-
  4096MiB with a starting memory of 512 MiB. It should get additional
  memory when needed, but the total available memory in the VM stays at
  the intial 512 MiB and the kernel starts swapping instead of
  allocating more memory from the host.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-18-generic 3.13.0-18.38
  ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6
  Uname: Linux 3.13.0-18-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDesktop: XFCE
  Date: Tue Mar 18 19:28:54 2014
  HibernationDevice: RESUME=UUID=0d223c65-8c7e-41b4-95b3-05b22ff4679b
  InstallationDate: Installed on 2014-03-12 (6 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140312)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  MachineType: Microsoft Corporation Virtual Machine
  ProcFB: 0 hyperv_fb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-18-generic.efi.signed root=UUID=61b52c1b-300d-4c30-8966-db1745f4a4bc ro video=hyperv_fb:1920x1080 quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-18-generic N/A
   linux-backports-modules-3.13.0-18-generic  N/A
   linux-firmware                             1.126
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/26/2012
  dmi.bios.vendor: Microsoft Corporation
  dmi.bios.version: Hyper-V UEFI Release v1.0
  dmi.board.asset.tag: None
  dmi.board.name: Virtual Machine
  dmi.board.vendor: Microsoft Corporation
  dmi.board.version: Hyper-V UEFI Release v1.0
  dmi.chassis.asset.tag: 6485-6574-9248-6162-4701-6267-50
  dmi.chassis.type: 3
  dmi.chassis.vendor: Microsoft Corporation
  dmi.chassis.version: Hyper-V UEFI Release v1.0
  dmi.modalias: dmi:bvnMicrosoftCorporation:bvrHyper-VUEFIReleasev1.0:bd11/26/2012:svnMicrosoftCorporation:pnVirtualMachine:pvrHyper-VUEFIReleasev1.0:rvnMicrosoftCorporation:rnVirtualMachine:rvrHyper-VUEFIReleasev1.0:cvnMicrosoftCorporation:ct3:cvrHyper-VUEFIReleasev1.0:
  dmi.product.name: Virtual Machine
  dmi.product.version: Hyper-V UEFI Release v1.0
  dmi.sys.vendor: Microsoft Corporation
  --- 
  ApportVersion: 2.14-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=2673d21f-4b48-43f1-9b06-8c141a492700
  InstallationDate: Installed on 2014-03-29 (9 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  MachineType: Microsoft Corporation Virtual Machine
  Package: linux (not installed)
  ProcFB: 0 hyperv_fb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-22-generic.efi.signed root=UUID=cccf5e59-012e-4ab5-a6ba-08850e60aba1 ro video=hyperv_fb:1920x1080 quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-22.44-generic 3.13.8
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-22-generic N/A
   linux-backports-modules-3.13.0-22-generic  N/A
   linux-firmware                             1.127
  RfKill:
   
  Tags:  trusty
  Uname: Linux 3.13.0-22-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 11/26/2012
  dmi.bios.vendor: Microsoft Corporation
  dmi.bios.version: Hyper-V UEFI Release v1.0
  dmi.board.asset.tag: None
  dmi.board.name: Virtual Machine
  dmi.board.vendor: Microsoft Corporation
  dmi.board.version: Hyper-V UEFI Release v1.0
  dmi.chassis.asset.tag: 6485-6574-9248-6162-4701-6267-50
  dmi.chassis.type: 3
  dmi.chassis.vendor: Microsoft Corporation
  dmi.chassis.version: Hyper-V UEFI Release v1.0
  dmi.modalias: dmi:bvnMicrosoftCorporation:bvrHyper-VUEFIReleasev1.0:bd11/26/2012:svnMicrosoftCorporation:pnVirtualMachine:pvrHyper-VUEFIReleasev1.0:rvnMicrosoftCorporation:rnVirtualMachine:rvrHyper-VUEFIReleasev1.0:cvnMicrosoftCorporation:ct3:cvrHyper-VUEFIReleasev1.0:
  dmi.product.name: Virtual Machine
  dmi.product.version: Hyper-V UEFI Release v1.0
  dmi.sys.vendor: Microsoft Corporation
  --- 
  ApportVersion: 2.14.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=2673d21f-4b48-43f1-9b06-8c141a492700
  InstallationDate: Installed on 2014-03-29 (12 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  MachineType: Microsoft Corporation Virtual Machine
  Package: linux (not installed)
  ProcFB: 0 hyperv_fb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-23-generic.efi.signed root=UUID=cccf5e59-012e-4ab5-a6ba-08850e60aba1 ro video=hyperv_fb:1920x1080 quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-23-generic N/A
   linux-backports-modules-3.13.0-23-generic  N/A
   linux-firmware                             1.127
  RfKill:
   
  Tags:  trusty
  Uname: Linux 3.13.0-23-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 11/26/2012
  dmi.bios.vendor: Microsoft Corporation
  dmi.bios.version: Hyper-V UEFI Release v1.0
  dmi.board.asset.tag: None
  dmi.board.name: Virtual Machine
  dmi.board.vendor: Microsoft Corporation
  dmi.board.version: Hyper-V UEFI Release v1.0
  dmi.chassis.asset.tag: 6485-6574-9248-6162-4701-6267-50
  dmi.chassis.type: 3
  dmi.chassis.vendor: Microsoft Corporation
  dmi.chassis.version: Hyper-V UEFI Release v1.0
  dmi.modalias: dmi:bvnMicrosoftCorporation:bvrHyper-VUEFIReleasev1.0:bd11/26/2012:svnMicrosoftCorporation:pnVirtualMachine:pvrHyper-VUEFIReleasev1.0:rvnMicrosoftCorporation:rnVirtualMachine:rvrHyper-VUEFIReleasev1.0:cvnMicrosoftCorporation:ct3:cvrHyper-VUEFIReleasev1.0:
  dmi.product.name: Virtual Machine
  dmi.product.version: Hyper-V UEFI Release v1.0
  dmi.sys.vendor: Microsoft Corporation

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References

[Bug 1294283] [NEW] Memory balloning in Hyper-V generation 2 does not work
From: Jan Henke, 2014-03-18