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[Bug 1301984] Re: unity-scope-loader is adding the SAME inotify watches regularly every 4 seconds

To: touch-packages@xxxxxxxxxxxxxxxxxxx
From: Marco Trevisan (Treviño) <mail@xxxxxxxxx>
Date: Mon, 21 Sep 2015 18:05:52 -0000
Reply-to: Bug 1301984 <1301984@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: libunity
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1301984

Title:
  unity-scope-loader is adding the SAME inotify watches regularly every
  4 seconds

Status in libunity:
  New
Status in libunity package in Ubuntu:
  New

Bug description:
  unity-scope-loader is adding the SAME inotify watches regularly every
  4 seconds:

  Inotify watches added:
    PID  Process              Rate/Sec File
    3495 unity-scope-loader      0.250 /usr/share/upstart/xdg/menus/unity-lens-applications-merged
    3495 unity-scope-loader      0.250 /etc/xdg/menus/unity-lens-applications-merged
    3495 unity-scope-loader      0.250 /usr/share/upstart/xdg/menus
    3495 unity-scope-loader      0.250 /usr/local/share/applications
    3495 unity-scope-loader      0.250 /usr/share/ubuntu/applications
    3495 unity-scope-loader      0.250 /home/king/.config/menus/unity-lens-applications-merged
    3495 unity-scope-loader      0.250 /etc/xdg/xdg-ubuntu/menus
    3495 unity-scope-loader      0.250 /etc/xdg/xdg-ubuntu/menus/unity-lens-applications-merged

  I'm seeing every 4 seconds the *same* files being added to an inotify
  watch.  Additionally, the code is polling every 4 seconds to do this:

  Top polling system calls:
    PID  Process              Syscall             Rate/Sec   Infinite   Zero     Minimum    Maximum    Average
                                                             Timeouts Timeouts   Timeout    Timeout    Timeout
    3476 unity-scope-loader   poll                    0.0167        2        3   0.0 sec    0.0 sec    0.0 sec 
    3495 unity-scope-loader   poll                    0.2500        0        0   4.0 sec    4.0 sec    4.0 sec 
   Total                                              0.2667        2        3

  the timeout is set to just 4 seconds.  Is this heavy polling and
  repeated  inotify watch adding really required?  We're trying to get
  the battery life to last longer and this kind of polling activity just
  is rather anti-social if it is not necessary.

  Attached are the results of a 5 minute analysis from the health-check
  too.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: libunity9 7.1.4+14.04.20140210-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-21.43-generic 3.13.8
  Uname: Linux 3.13.0-21-generic x86_64
  ApportVersion: 2.14-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Apr  3 15:14:14 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-03-25 (9 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140323)
  SourcePackage: libunity
  UpgradeStatus: No upgrade log present (probably fresh install)

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