[callgrind] compiz spends ~7% of its time inserting into and destructing the events list in PrivateScreen::processEvents()

[Daniel van Vugt]

[Test Case]
Performance improvement, no obvious test case possible. Check for visible regressions.

[Regression Potential]
Broken compiz debugging, broken XEvent handling

Original description:

Compiz spends ~7% of its time inserting XEvents into the events list, and destroying the events list, in PrivateScreen::processEvents().

[Daniel van Vugt (vanvugt)]

This is of most concern when graphics drivers have sync-to-vblank disabled by default (like nvidia, nouveau). In this case, 3D apps will emit damage events to the server unthrottled, and compiz has to deal with lots more events than it really should.

[Daniel van Vugt (vanvugt)]

Fix committed into lp:compiz at revision 3243

[Daniel van Vugt (vanvugt)]

Fix committed into lp:compiz-core/0.9.7 at revision 3109

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Brian Murray (brian-murray)]

Hello Daniel, or anyone else affected,

Accepted compiz into precise-proposed. The package will build now and be available at http://launchpad.net/ubuntu/+source/compiz/1:0.9.7.8-0ubuntu1.1 in a few hours and then in the -proposed repository. Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you please change the bug tag from verification-needed to verification-done. If it does not, change the tag to verification-failed. In either case details of your testing will help us make a better decision. Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

[Launchpad Janitor (janitor)]

This bug was fixed in the package compiz - 1:0.9.8+bzr3249-0ubuntu1

---------------
compiz (1:0.9.8+bzr3249-0ubuntu1) quantal-proposed; urgency=low

  * New upstream snapshot.
    - Fall back to a refresh rate that is more likely to look correct; 60Hz.
      (LP: #1009338)
    - Benchmark plugin should consume its key binding, and not pass the key to
      the underlying window. (LP: #1009320)
    - Avoid needless STL operations leading to expensive heap operations.
      (LP: #1006335)
    - Fix a typo that was causing (LP: #1002606)
      (widthIncBorders/heightIncBorders)
    - Check if the window is decorated before trying to change its event window
      states (which won't exist if not decorated) (LP: #1007754)
    - Use the XDamage extension more efficiently (the way it was designed to be
      used). This dramatically reduces CPU usage, reduces wakeups, and
      increases frame rates. It also solves at least one observed performance
      bug (LP: #1007299) and probably several more.
    - Avoid constructing and destructing lots of strings on every single event,
      which was wasting lots of CPU (LP: #1005569)
    - md LINGUAS doesn't exist, it's mnk (Mandinka in ISO 639-3)
    - Move grid plugin to google test and don't depend on the plugin for the
      test (LP: #1005009)
    - Don't read plugin.Initialized and test the value. (LP: #1004848)
    - libcompizconfig's install () commands were still using the old includedir
      and libdir variables rather than their libcompizconfig_* variants.
      (LP: #1005176)
    - Execute the cmake files separately to ensure that DESTDIR is respected.
      (LP: #1005177)
    - Don't set_target_properties on a target that might not exist
      (LP: #1005008)
    - Don't allow windows which we weren't even tracking as decoratable to
      become decorated if they try and change their hints. (LP: #963794)
    - Change the mouse pointer while dragging windows in expo. Just like the
      ubuntu branches do. (LP: #987647)
    - Fix uninitialized memory use (LP: #1004338)
    - Fix uninitialized variable (LP: #1004335)
    - Delay unbinding of pixmaps until then next rebind (LP: #729979)
      (LP: #1002602)
    - Don't drop plugins from the list to try and load before you've even tried
      to load them. Doing so makes missing plugins silently ignored instead of
      an error message (LP: #1002715). It also means valid plugins in more
      unusual, but real locations in LD_LIBRARY_PATH will never get loaded
      (LP: #1002721).
    - If running test cases under a real X server, we don't care if Xvfb is
      missing (LP: #994841)
    - Don't assume pkg_check_modules always sets _PREFIX (LP: #993608)
    - Don't clear selections in ~PrivateScreen because it causes a race between
      the existing and the new compiz instances, breaking --replace and
      non-replace behaviour. (LP: #988684) (LP: #989545)
    - Always paint with infiniteRegion as the clip region if the window is
      transformed and always use the supplied region if painting with offset or
      on transformed screen. (LP: #987639)
    - Add synchronization primitives to the decoration protocol so that there
      isn't a r...

[Miklos Juhasz (mjuhasz)]

No regression on Intel i7 with the integrated VGA card. Also tested an ATI card using the radeon driver, works fine.

[Launchpad Janitor (janitor)]

This bug was fixed in the package compiz - 1:0.9.7.8-0ubuntu1.1

---------------
compiz (1:0.9.7.8-0ubuntu1.1) precise-proposed; urgency=low

  [ Łukasz 'sil2100' Zemczak ]
  * Cherry-pick upstream patches:
    - CMake Error at FindCompiz.cmake:84 (include): include could not find load
      file: CompizDefaults (LP: #993608)
    - compiz (decor) - Warn: failed to bind pixmap to texture (LP: #929989)
    - gtk-window-decorator crashed with SIGFPE in
      _decor_blend_horz_border_picture() (LP: #963794)
    - [callgrind] compiz spends ~25% of its time constructing/destructing
      strings in PrivateScreen::handleActionEvent (LP: #1005569)
    - gtk-window-decorator crashed with SIGSEGV in meta_get_decoration_geometry
      (LP: #1007754)
    - composite refresh rate falls back to 50Hz, which is wrong in most cases
      (LP: #1009338)
    - [callgrind] compiz spends ~7% of its time inserting into and destructing
      the events list in PrivateScreen::processEvents() (LP: #1006335)

  [ Didier Roche ]
  * debian/control:
    - change Vcs-Bzr to point to precise branches
 -- Lukasz 'sil2100' Zemczak <email address hidden> Wed, 20 Jun 2012 15:02:31 +0100

[Steve Langasek (vorlon)]

Hello Daniel, or anyone else affected,

Accepted compiz into precise-proposed. The package will build now and be available at http://launchpad.net/ubuntu/+source/compiz/1:0.9.7.8-0ubuntu1.3 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please change the bug tag from verification-needed to verification-done. If it does not, change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

[Miklos Juhasz (mjuhasz)]

No visible regression found. Tested on Intel i7 with the integrated vga card, on an nVidia card with the binary blob and on a MacBookPro 8,2 with both the integrated Intel i7 card and the discrete ATI card using the radeon driver.

[Adam Conrad (adconrad)]

Hello Daniel, or anyone else affected,

Accepted compiz into precise-proposed. The package will build now and be available at http://launchpad.net/ubuntu/+source/compiz/1:0.9.7.8-0ubuntu1.4 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please change the bug tag from verification-needed to verification-done. If it does not, change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

[Timo Jyrinki (timo-jyrinki)]

No regressions observed on two different computers (intel + amd), and no x86 changes since 1.3.

[Adam Conrad (adconrad)]

The verification of this Stable Release Update has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regresssions.