compiz team mailing list archive

[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

Here are my comments on the resizing bottlenecks I found while we were
fixing bug 1027211...

OK, I've tracked down the main offenders that remain _after_ this fix.

1. XSync() inside PrivateWindow::updateRegion()
2. XShapeGetRectangles() inside PrivateWindow::updateRegion()
3. XShapeGetRectangles() called from decor.

If you remove those from the equation then there is no longer a complete
freeze. But it still stutters. Further analysis then shows compiz
spending its time in one of:

(a) XSync in PixmapBinding::bind
(b) bindTexImageGLX
(c) PrivateVertexBuffer::render

I should add that reverting to the old asynchronous damage handling does
not help at all with stutters/freezing. The main issues are those listed
above.

It looks to me like our XShape support could be made more efficient
instead if synchronously querying XShapeGetRectangles all the time.

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https://bugs.launchpad.net/bugs/1100073

Title:
  Normal resize mode temporarily hangs the desktop

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