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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

This issue appears to be an upstream bug. Would it be possible for you
to open an upstream bug report[0]? That will allow the upstream
Developers to examine the issue, and may provide a quicker resolution to
the bug.

Please follow the instructions on the wiki page[0]. The first step is to
email the appropriate mailing list. If no response is received, then a
bug may be opened on bugzilla.kernel.org.

Once this bug is reported upstream, please add the tag: 'kernel-bug-
reported-upstream'.

[0] https://wiki.ubuntu.com/Bugs/Upstream/kernel

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: Confirmed => Triaged

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https://bugs.launchpad.net/bugs/1591519

Title:
  On function fsnotify issue.

Status in linux package in Ubuntu:
  Triaged

Bug description:
  Bellow is content of perf report:

  ..........................
         │     ↑ jmpq   1f6                                                                                       ▒
         │40b:   cmpq   $0x0,0x220(%rdi)                                                                          ▒
         │       mov    (%rdx),%rax                                                                               ▒
         │       lea    -0x20(%rax),%rbx                                                                          ▒
         │     ↑ jne    78                                                                                        ▒
         │       test   %rbx,%rbx                                                                                 ▒
         │     ↓ je     433                                                                                       ▒
         │       cmpq   $0x0,0xe0(%rax)                                                                           ▒
  100,00 │     ↑ jne    78                                                                                        ▒
         │433:   xor    %eax,%eax                                                                                 ▒
         │     ↑ jmpq   30a                                                                                       ▒
         │43a:   test   %rbx,%rbx                                                                                 ▒
         │     ↑ je     361                                                                                       ▒
         │       test   %r15d,0x108(%rbx)                                                                         ▒
         │     ↑ jne    d8                                                                                        ▒
         │     ↑ jmpq   361                                                                                       ▒
         │455:   testb  $0x4,0xcce9b6(%rip)                                                                       ▒
         │     ↑ je     185                                                                                       ▒
         │       xor    %r11d,%r11d                                                                               ▒
         │       xor    %esi,%esi             
  .................................

  Here is function file  http://lxr.free-
  electrons.com/source/fs/notify/fsnotify.c#L190

  277 
  278                 if (ret && (mask & ALL_FSNOTIFY_PERM_EVENTS))
  279                         goto out;
  280 

  On loop these lines take to long time to bee processed.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-22-generic 4.4.0-22.40
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0p:   asu        3213 F...m pulseaudio
   /dev/snd/controlC0:  asu        3213 F.... pulseaudio
  CurrentDesktop: MATE
  Date: Sat Jun 11 17:26:52 2016
  InstallationDate: Installed on 2016-04-29 (43 days ago)
  InstallationMedia: Ubuntu-Studio 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  IwConfig:
   lo        no wireless extensions.
   
   enp1s0    no wireless extensions.
  MachineType: Olidata S.p.A. ALABAMA
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic root=/dev/mapper/192--168--0--108--vg-root ro
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/08/2008
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: S0101
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: To be filled by O.E.M.
  dmi.board.vendor: To be filled by O.E.M.
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrS0101:bd07/08/2008:svnOlidataS.p.A.:pnALABAMA:pvrToBeFilledByO.E.M.:rvnTobefilledbyO.E.M.:rnTobefilledbyO.E.M.:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: ALABAMA
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: Olidata S.p.A.

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