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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** Summary changed:

- Computer unusable under memory pressure with no swap space
+ [Lenovo ThinkPad X220] Computer unusable under memory pressure with no swap space

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https://bugs.launchpad.net/bugs/1390358

Title:
  [Lenovo ThinkPad X220] Computer unusable under memory pressure with no
  swap space

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I've a laptop with 8 gigabytes of RAM, an Intel SSD, and no swap
  partition (because I don't want to wear out my SSD).

  Since I upgraded to Ubuntu 14.10, about once a week my laptop suddenly
  goes into happy-swap-land:

  - HDD led is on all the time
  - windows stop redrawing
  - mouse cursor doesn't move (or moves about 1/2px per minute max)
  - CapsLock takes 60 seconds between keypress and the LED turning on

  I just had another episode and gave it 25 minutes to get better.  It
  didn't.  I had to Alt-SysRq-S,U,B to get back a working computer.

  I had `atop` installed, so I've snapshots of the system state taken
  every 10 minutes.  These show sda being busy 100% of the time, reading
  250 MB/s, with all the running processes being responsible for the
  reads (e.g. Skype read 13.5 GB of data in one 10 minute window).  They
  also show the number of scanned pages jumped up to to 2744e5, and then
  up to1630e6 and stayed there.

  As far as I can tell, this means the kernel decided to free some pages
  and started evicting mapped library/executable pages which only got
  read back in the next instant because running programs need those
  pages to run.

  I've no idea why the OOM killer didn't kick in.

  I've no idea why the kernel didn't discard some pages from the page
  cache.  atop shows the page cache was 4.1G during all that time and
  didn't go up or down.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-25-generic 3.16.0-25.33
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  Uname: Linux 3.16.0-25-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mg         3394 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Fri Nov  7 10:10:44 2014
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=bf592a79-5f4e-486d-b69d-7525d492dcc6
  InstallationDate: Installed on 2012-07-25 (834 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  Lsusb:
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 4291WJF
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic root=UUID=36079681-53fc-4ca2-80ac-98321c07e8d2 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-25-generic N/A
   linux-backports-modules-3.16.0-25-generic  N/A
   linux-firmware                             1.138
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2014-10-24 (13 days ago)
  dmi.bios.date: 07/18/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET69WW (1.39 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4291WJF
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8DET69WW(1.39):bd07/18/2013:svnLENOVO:pn4291WJF:pvrThinkPadX220:rvnLENOVO:rn4291WJF:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4291WJF
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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