78826 2012-02-16 09:46:39 -0800 [GTK] [AC] Events can starve accelerated compositing updates 2012-02-17 12:00:21 -0800 1 1 1 Unclassified WebKit WebKitGTK 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 mrobinson mrobinson alex gustavo oldest_to_newest 558277 0 mrobinson 2012-02-16 09:46:39 -0800 WebCore timers can be starved by a deluge of GTK+ events. We want AC updates to run with the same priority as events so that dragging doesn't block rendering. 558309 1 127404 mrobinson 2012-02-16 10:31:32 -0800 Created attachment 127404 Patch 558315 2 127404 gustavo 2012-02-16 10:40:18 -0800 Comment on attachment 127404 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=127404&action=review > Source/WebKit/gtk/WebCoreSupport/AcceleratedCompositingContextGL.cpp:175 > core(m_webView)->mainFrame()->view()->syncCompositingStateIncludingSubframes(); One thing I've noticed while working with the clutter AC stuff is that this call may some times not go through because of a pending layout, and the sync will in those cases not go through untill we are lucky to have another sync requested with no layout pending. I am unsure tbh whether that is caused by a bug in our implementation, but it looks like something that is expected, since it's a check instead of an ASSERT() inside FrameView::syncCompositingStateForThisFrame. Unrelated to this patch, but something to keep in mind. > Source/WebKit/gtk/WebCoreSupport/AcceleratedCompositingContextGL.cpp:188 > + m_syncTimerCallbackId = g_timeout_add_full(GDK_PRIORITY_EVENTS, 1000.0 / 60.0, reinterpret_cast<GSourceFunc>(syncLayersTimeoutCallback), this, 0); OK, I guess. I was thinking here right now that I tend to consider layer synchronization more a relayout-like thing than a redraw-like thing. Using GTK_PRIORITY_RESIZE might make more sense if we ever figure out the appropriate balance among the existing priorities =( 559408 3 mrobinson 2012-02-17 12:00:21 -0800 Committed r108104: <http://trac.webkit.org/changeset/108104> 127404 2012-02-16 10:31:32 -0800 2012-02-16 10:40:18 -0800 Patch bug-78826-20120216103125.patch text/plain 7946 mrobinson U3VidmVyc2lvbiBSZXZpc2lvbjogMTA3MDQzCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L2d0 ay9DaGFuZ2VMb2cgYi9Tb3VyY2UvV2ViS2l0L2d0ay9DaGFuZ2VMb2cKaW5kZXggNzQwNjUzMzAw YWRjMWZmYWVjYWM0ODkyZmNmOTMyMDBjOTdkOTcwYS4uMzUxYWZkMzZiNGNmM2NmZWM0NmVkZWU4 ZWFmMDAxYTAzOTE0ZmU0YyAxMDA2NDQKLS0tIGEvU291cmNlL1dlYktpdC9ndGsvQ2hhbmdlTG9n CisrKyBiL1NvdXJjZS9XZWJLaXQvZ3RrL0NoYW5nZUxvZwpAQCAtMSwzICsxLDMxIEBACisyMDEy LTAyLTE2ICBNYXJ0aW4gUm9iaW5zb24gIDxtcm9iaW5zb25AaWdhbGlhLmNvbT4KKworICAgICAg ICBbR1RLXSBbQUNdIEV2ZW50cyBjYW4gc3RhcnZlIGFjY2VsZXJhdGVkIGNvbXBvc2l0aW5nIHVw ZGF0ZXMKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTc4 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