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[asu <corcodel.marian@xxxxxxxxx>]

Public bug reported:

Bellow is result of perf report:
clear_page_orig  /proc/kcore                                                                                     
       │
       │
       │
       │    Disassembly of section load0:
       │
       │    ffffffff813f7b30 <load0>:
       │      xor    %eax,%eax
       │      mov    $0x40,%ecx
       │      nop
  5,71 │10:   dec    %ecx
       │      mov    %rax,(%rdi)
 80,00 │      mov    %rax,0x8(%rdi)
  2,86 │      mov    %rax,0x10(%rdi)
       │      mov    %rax,0x18(%rdi)
  2,86 │      mov    %rax,0x20(%rdi)
  5,71 │      mov    %rax,0x28(%rdi)
  2,86 │      mov    %rax,0x30(%rdi)
       │      mov    %rax,0x38(%rdi)
       │      lea    0x40(%rdi),%rdi
       │    ↑ jne    10
       │      nop
       │    ← retq

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-28-generic 4.4.0-28.47
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  asu        3104 F.... pulseaudio
CurrentDesktop: MATE
Date: Sat Jul  2 20:15:06 2016
InstallationDate: Installed on 2016-04-29 (64 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-4.4.0-28-generic root=/dev/mapper/192--168--0--108--vg-root ro
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-28-generic N/A
 linux-backports-modules-4.4.0-28-generic  N/A
 linux-firmware                            1.157.1
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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug xenial

** Patch added: "Tested on linux-4.6.2"
   https://bugs.launchpad.net/bugs/1598474/+attachment/4694357/+files/some_opti.patch

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https://bugs.launchpad.net/bugs/1598474

Title:
  On clear_page_orig function issue.

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Bellow is result of perf report:
  clear_page_orig  /proc/kcore                                                                                     
         │
         │
         │
         │    Disassembly of section load0:
         │
         │    ffffffff813f7b30 <load0>:
         │      xor    %eax,%eax
         │      mov    $0x40,%ecx
         │      nop
    5,71 │10:   dec    %ecx
         │      mov    %rax,(%rdi)
   80,00 │      mov    %rax,0x8(%rdi)
    2,86 │      mov    %rax,0x10(%rdi)
         │      mov    %rax,0x18(%rdi)
    2,86 │      mov    %rax,0x20(%rdi)
    5,71 │      mov    %rax,0x28(%rdi)
    2,86 │      mov    %rax,0x30(%rdi)
         │      mov    %rax,0x38(%rdi)
         │      lea    0x40(%rdi),%rdi
         │    ↑ jne    10
         │      nop
         │    ← retq

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-28-generic 4.4.0-28.47
  ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
  Uname: Linux 4.4.0-28-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  asu        3104 F.... pulseaudio
  CurrentDesktop: MATE
  Date: Sat Jul  2 20:15:06 2016
  InstallationDate: Installed on 2016-04-29 (64 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-4.4.0-28-generic root=/dev/mapper/192--168--0--108--vg-root ro
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-28-generic N/A
   linux-backports-modules-4.4.0-28-generic  N/A
   linux-firmware                            1.157.1
  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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