195270 2019-03-04 02:24:56 -0800 [CoordinatedGraphics] The compositing loop is still running even after exiting AC mode 2019-04-02 01:39:06 -0700 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=194979 https://bugs.webkit.org/show_bug.cgi?id=184969 P2 Normal --- 186364 194979 1 fujii webkit-unassigned bugs-noreply cgarcia commit-queue don.olmstead zan oldest_to_newest 1512102 0 fujii 2019-03-04 02:24:56 -0800 [CoordinatedGraphics] The compositing loop is still running even after exiting AC mode I tested with GTK port MiniBrowser, trunk@242333. 1) Go to https://bugs.webkit.org/ 2) Go to https://webkit.org/blog-files/3d-transforms/morphing-cubes.html 3) Back 4) The compositing loop is still running. 5) Wait to 5 second to destruct LayerTreeHost 6) The compositing loop is still running. Callstack: > #0 WebKit::ThreadedCompositor::renderLayerTree (this=0x7fae65f165d8) > at ../../Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp:178 > #1 0x00007fae7c3c0f2f in WebKit::ThreadedCompositor::<lambda()>::operator()(void) const (__closure=0x7fae65f04bb8) > at ../../Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/ThreadedCompositor.cpp:57 > #2 0x00007fae7c3c8fc4 in WTF::Function<void()>::CallableWrapper<WebKit::ThreadedCompositor::ThreadedCompositor(WebKit::ThreadedCompositor::Client&, WebKit::ThreadedDisplayRefreshMonitor::Client&, WebCore::PlatformDisplayID, const WebCore::IntSize&, float, WebKit::ThreadedCompositor::ShouldDoFrameSync, WebCore::TextureMapper::PaintFlags)::<lambda()> >::call(void) (this=0x7fae65f04bb0) at DerivedSources/ForwardingHeaders/wtf/Function.h:102 > #3 0x00007fae7bf0808e in WTF::Function<void ()>::operator()() const (this=0x7fae65fb4f50) at DerivedSources/ForwardingHeaders/wtf/Function.h:57 > #4 0x00007fae7c3c0e58 in WebKit::CompositingRunLoop::updateTimerFired (this=0x7fae65fb4f08) > at ../../Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/CompositingRunLoop.cpp:210 > #5 0x00007fae7c3da726 in WTF::RunLoop::Timer<WebKit::CompositingRunLoop>::fired (this=0x7fae65fb4f10) at DerivedSources/ForwardingHeaders/wtf/RunLoop.h:148 > #6 0x00007fae70208723 in WTF::RunLoop::TimerBase::<lambda(gpointer)>::operator()(gpointer) const (__closure=0x0, userData=0x7fae65fb4f10) > at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:171 > #7 0x00007fae7020877b in WTF::RunLoop::TimerBase::<lambda(gpointer)>::_FUN(gpointer) () at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:177 > #8 0x00007fae70207dc4 in WTF::<lambda(GSource*, GSourceFunc, gpointer)>::operator()(GSource *, GSourceFunc, gpointer) const (__closure=0x0, > source=0x55ad6efe9760, callback=0x7fae7020875e <WTF::RunLoop::TimerBase::<lambda(gpointer)>::_FUN(gpointer)>, userData=0x7fae65fb4f10) > at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:45 > #9 0x00007fae70207df4 in WTF::<lambda(GSource*, GSourceFunc, gpointer)>::_FUN(GSource *, GSourceFunc, gpointer) () at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:46 > #10 0x00007fae71daaa58 in g_main_dispatch () at ../../Source/glib-2.58.1/glib/gmain.c:3182 > #11 g_main_context_dispatch () at ../../Source/glib-2.58.1/glib/gmain.c:3847 > #12 0x00007fae71daae48 in g_main_context_iterate () at ../../Source/glib-2.58.1/glib/gmain.c:3920 > #13 0x00007fae71dab142 in g_main_loop_run () at ../../Source/glib-2.58.1/glib/gmain.c:4116 > #14 0x00007fae70208333 in WTF::RunLoop::run () at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:96 > #15 0x00007fae7c3c05e5 in WebKit::<lambda()>::operator()(void) const (__closure=0x7fae1e0dd278) > at ../../Source/WebKit/Shared/CoordinatedGraphics/threadedcompositor/CompositingRunLoop.cpp:49 > #16 0x00007fae7c3c90b4 in WTF::Function<void()>::CallableWrapper<WebKit::createRunLoop()::<lambda()> >::call(void) (this=0x7fae1e0dd270) > at DerivedSources/ForwardingHeaders/wtf/Function.h:102 > #17 0x00007fae7bf0808e in WTF::Function<void ()>::operator()() const (this=0x7fadf69fec30) at DerivedSources/ForwardingHeaders/wtf/Function.h:57 > #18 0x00007fae701936c3 in WTF::Thread::entryPoint (newThreadContext=0x7fae65f1e8c0) at ../../Source/WTF/wtf/Threading.cpp:148 > #19 0x00007fae7020ab87 in WTF::wtfThreadEntryPoint (context=0x7fae65f1e8c0) at ../../Source/WTF/wtf/posix/ThreadingPOSIX.cpp:200 > #20 0x00007fae6c5fd164 in start_thread (arg=<optimized out>) at pthread_create.c:486 > #21 0x00007fae72c2bdef in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 1512110 1 cgarcia 2019-03-04 03:34:07 -0800 I think this is because of PSON, it was enabled in GTK, but we are not yet ready to enable it. 1512117 2 cgarcia 2019-03-04 03:57:18 -0800 I'm going to rollout r242045, but I'm leaving this bug open, because the compositor run loop shouldn't be running even for the 5 seconds until the layer host is destroyed. I have a wip patch to properly suspend/resume the threaded compositor. 1512133 3 fujii 2019-03-04 05:52:41 -0800 Thank you. This is causing a flicker bug mixing AC rendering and non-AC rendering for the five seconds. I tried to stop the compositing loop in WIP patch, but it doesn't work as expected (Bug 186364 Comment 10). 1512144 4 363507 cgarcia 2019-03-04 06:34:06 -0800 Created attachment 363507 Patch 1512211 5 363507 commit-queue 2019-03-04 10:06:24 -0800 Comment on attachment 363507 Patch Clearing flags on attachment: 363507 Committed r242364: <https://trac.webkit.org/changeset/242364> 1512212 6 commit-queue 2019-03-04 10:06:25 -0800 All reviewed patches have been landed. Closing bug. 1512436 7 fujii 2019-03-04 17:54:01 -0800 I confirmed your change fixed the WinCairo issue (Bug 186364 Comment 12). It works very nicely. Thank you very much. 363507 2019-03-04 06:34:06 -0800 2019-03-04 10:06:24 -0800 Patch wk2-pause-threaded-compositor.diff text/plain 5937 cgarcia ZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nIGIvU291cmNlL1dlYktpdC9DaGFu Z2VMb2cKaW5kZXggNjYyZGE1YmFjNTAuLmJhNzc2NTNiNjBhIDEwMDY0NAotLS0gYS9Tb3VyY2Uv V2ViS2l0L0NoYW5nZUxvZworKysgYi9Tb3VyY2UvV2ViS2l0L0NoYW5nZUxvZwpAQCAtMSwzICsx LDI1IEBACisyMDE5LTAzLTA0ICBDYXJsb3MgR2FyY2lhIENhbXBvcyAgPGNnYXJjaWFAaWdhbGlh LmNvbT4KKworICAgICAgICBbQ29vcmRpbmF0ZWRHcmFwaGljc10gVGhlIGNvbXBvc2l0aW5nIGxv b3AgaXMgc3RpbGwgcnVubmluZyBldmVuIGFmdGVyIGV4aXRpbmcgQUMgbW9kZQorICAgICAgICBo dHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTk1MjcwCisKKyAgICAgICAg UmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgU3VzcGVuZCB0aGUgdGhyZWFk ZWQgY29tcG9zaXRvciB3aGVuIHRoZSBwYWludGluZyBpcyBwYXVzZWQgb3IgbGF5ZXIgZmx1c2gg ZGlzYWJsZWQsIGFuZCByZXN1bWUgaXQgYWdhaW4gd2hlbgorICAgICAgICBwYWludGluZyBpcyBy ZXN1bWVkIGFuZCBsYXllciBmbHVzaCBlbmFibGVkLgorCisgICAgICAgICogU2hhcmVkL0Nvb3Jk 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