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[Bug 1547231] Re: /proc/$pid/maps performance regression


** Also affects: linux (Ubuntu Xenial)
   Importance: Medium
       Status: Triaged

** Also affects: linux (Ubuntu Vivid)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: Triaged => Fix Committed

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Wily)
       Status: New => In Progress

** Changed in: linux (Ubuntu Wily)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

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  /proc/$pid/maps performance regression

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Trusty:
Status in linux source package in Vivid:
Status in linux source package in Wily:
  In Progress
Status in linux source package in Xenial:
  Fix Committed

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:

  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
  Uname: Linux 3.13.0-36-generic x86_64
   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
   PATH=(custom, no user)
  ProcFB: 0 astdrmfb
  ProcKernelCmdLine: root=/dev/md1 ro console=tty0 console=ttyS0,57600
   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)
  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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