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[Launchpad Bug Tracker <1547231@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/trusty-proposed/linux-lts-wily

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https://bugs.launchpad.net/bugs/1547231

Title:
  /proc/$pid/maps performance regression

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Triaged
Status in linux source package in Vivid:
  Fix Committed
Status in linux source package in Wily:
  Fix Committed
Status in linux source package in Xenial:
  Fix Released

Bug description:
  /proc/$pid/maps experienced a significant performance regression for
  processes with large numbers of threads between Precise and Trusty due
  to an upstream bug. This behavior is currently blocking my ability to
  upgrade to Trusty, as we depend on applications with with 10s of
  thousands of threads.

  The issue has been fixed in the usptream -mm tree.

  Upstream report: http://comments.gmane.org/gmane.linux.kernel.mm/144712
  Upstream patches:
  https://git.kernel.org/cgit/linux/kernel/git/mhocko/mm.git/commit/?h=since-4.4&id=2d2a106c79f4b5b2b10e72957f7448e276dbf0a9
  https://git.kernel.org/cgit/linux/kernel/git/mhocko/mm.git/commit/?h=since-4.4&id=eb1899e03405faf7c79396ae9593303d53e2710d

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-36-generic 3.13.0-36.63
  ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
  Uname: Linux 3.13.0-36-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Feb 18 12:13 seq
   crw-rw---- 1 root audio 116, 33 Feb 18 12:13 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Thu Feb 18 13:44:23 2016
  MachineType: Supermicro A1SAi
  PciMultimedia:
   
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 astdrmfb
  ProcKernelCmdLine: root=/dev/md1 ro console=tty0 console=ttyS0,57600
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-36-generic N/A
   linux-backports-modules-3.13.0-36-generic  N/A
   linux-firmware                             1.127.20
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-07-18 (579 days ago)
  WifiSyslog:
   
  dmi.bios.date: 02/27/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.0c
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: A1SAi
  dmi.board.vendor: Supermicro
  dmi.board.version: 123456789
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 18
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.0c:bd02/27/2014:svnSupermicro:pnA1SAi:pvr123456789:rvnSupermicro:rnA1SAi:rvr123456789:cvnToBeFilledByO.E.M.:ct18:cvrToBeFilledByO.E.M.:
  dmi.product.name: A1SAi
  dmi.product.version: 123456789
  dmi.sys.vendor: Supermicro

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