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[wilk <j.cubizolles@xxxxxxx>]

I've noticed it when  running emacs-snapshot. emacs is very responsive
at first but after a while (one hour more or less) it's unbearably slow.
Moving the focus from one window to another takes a few seconds. When
that happens, both emacs and hud-service cpu usage go up to 100% (I have
a dual-core CPU).

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https://bugs.launchpad.net/bugs/1300722

Title:
  hud-service is eating up 100% of one of my CPUs in a poll loop

Status in Unity HUD:
  Confirmed
Status in “hud” package in Ubuntu:
  In Progress

Bug description:
  hud-service is polling like crazy:

  Context Switches:
    PID  Process                Voluntary   Involuntary     Total
                               Ctxt Sw/Sec  Ctxt Sw/Sec  Ctxt Sw/Sec
    2295 hud-service              46084.63        42.94     46127.58 (very high)
    2325 hud-service                  0.09         0.00         0.09 (very low)
    2329 hud-service                  0.07         0.00         0.07 (very low)
    2340 hud-service                  0.05         0.00         0.05 (very low)
   Total                          46084.84        42.94     46127.78

  File I/O operations:
   No file I/O operations detected.

  System calls traced:
    PID  Process              Syscall               Count    Rate/Sec
    2295 hud-service          poll                 999983   23124.8503
    2295 hud-service          write                    10       0.2313
    2295 hud-service          sendmsg                   4       0.0925
    2325 hud-service          restart_syscall           1       0.0231
    2329 hud-service          restart_syscall           1       0.0231
    2340 hud-service          restart_syscall           1       0.0231
   Total                                          1000000   23125.2435

  (gdb) where
  #0  0x00007fda8121cfbd in poll () at ../sysdeps/unix/syscall-template.S:81
  #1  0x00007fda7f1bb4b8 in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
  #2  0x00007fda7f1ba3ff in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
  #3  0x00007fda7f1a49dc in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
  #4  0x00007fda7f1a5464 in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
  #5  0x00007fda82ce9e65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
  #6  0x00007fda82d2fc64 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
  #7  0x00007fda82d30582 in QDBusPendingCallWatcher::waitForFinished() () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
  #8  0x00007fda83eb940b in DBusMenuImporter::slotMenuAboutToShow() () from /usr/lib/x86_64-linux-gnu/libdbusmenu-qt5.so.2
  #9  0x00007fda8435d2a6 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #10 0x000000000045ab3f in hud::service::DBusMenuCollector::openMenu(QMenu*, unsigned int&) ()
  #11 0x000000000045abd8 in hud::service::DBusMenuCollector::openMenu(QMenu*, unsigned int&) ()
  #12 0x000000000045abd8 in hud::service::DBusMenuCollector::openMenu(QMenu*, unsigned int&) ()
  #13 0x000000000045abd8 in hud::service::DBusMenuCollector::openMenu(QMenu*, unsigned int&) ()
  #14 0x000000000045abd8 in hud::service::DBusMenuCollector::openMenu(QMenu*, unsigned int&) ()
  #15 0x000000000045abd8 in hud::service::DBusMenuCollector::openMenu(QMenu*, unsigned int&) ()
  #16 0x000000000045ae8d in hud::service::DBusMenuCollector::activate() ()
  #17 0x0000000000441e43 in hud::service::WindowImpl::activate() ()
  #18 0x0000000000439f6a in hud::service::QueryImpl::updateToken(QSharedPointer<hud::service::Window>) ()
  #19 0x000000000043a672 in hud::service::QueryImpl::refresh() ()
  #20 0x000000000044b115 in ?? ()
  #21 0x00007fda8435d2a6 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #22 0x000000000045662a in hud::service::ApplicationListImpl::FocusedWindowChanged(unsigned int, QString const&, unsigned int) ()
  #23 0x00007fda8435d2a6 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #24 0x0000000000467361 in ComCanonicalUnityWindowStackInterface::FocusedWindowChanged(unsigned int, QString const&, unsigned int) ()
  #25 0x00000000004678bd in ?? ()
  #26 0x0000000000467c63 in ComCanonicalUnityWindowStackInterface::qt_metacall(QMetaObject::Call, int, void**) ()
  #27 0x00007fda82cf180f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
  #28 0x00007fda8435e22e in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #29 0x00007fda823d5c2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
  #30 0x00007fda823dadf6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
  #31 0x00007fda84335c2d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #32 0x00007fda84337e07 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #33 0x00007fda84382cd3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #34 0x00007fda833dbe04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #35 0x00007fda833dc048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: hud 13.10.1+14.04.20140326-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-20.42-generic 3.13.7
  Uname: Linux 3.13.0-20-generic x86_64
  ApportVersion: 2.14-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Apr  1 12:23:11 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-03-25 (7 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140323)
  SourcePackage: hud
  UpgradeStatus: No upgrade log present (probably fresh install)

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