240392 2022-05-13 11:32:35 -0700 [GTK][WPE] Current-context enforcement in ANGLE is expensive 2023-09-06 14:44:50 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=254286 InRadar P2 Normal --- 237649 1 zan zan alex aperez benjamin cdumez cmarcelo dino ews-watchlist kondapallykalyan mcatanzaro webkit-bug-importer oldest_to_newest 1868814 0 zan 2022-05-13 11:32:35 -0700 For basically every WebGL entrypoint, the ANGLE context is enforced to be current for the executing thread. There's at this point in time the smart check to test whether the current context is already the one that we are using, through comparing against EGL_GetCurrentContext() return value. Only when not equal do we go on to call EGL_MakeCurrent(). Even the check is still expensive because it does an inefficient job of loading from thread-local storage. Because it's called on every WebGL entrypoint this becomes quite visible on profiles and a considerable amount of time is spent here. I can provide receipts later. ANGLE is internally using the `thread_local` specifier on the data structure holding the current-context value. Mesa doesn't suffer from this, and is using the `__thread` specifier, along with the `tls_model("initial-exec")` attribute. This needs confirmation on what the differentiator exactly is, after that it should be possible to decide what to change and where to do it. 1869153 1 459407 zan 2022-05-15 23:54:55 -0700 Created attachment 459407 WIP patch 1869166 2 zan 2022-05-16 01:26:58 -0700 Testing on equal WebGL load, this is the difference: Current current-context handling, through ANGLE: > CPU utilization of the WebProcess: > 2,629.68 msec task-clock # 0.657 CPUs utilized > Percentage of CPU utilization spent under and inside makeContextCurrent(): > 4.82% 0.57% WPEWebProcess libWPEWebKit-1.0.so.3.17.0 [.] WebCore::GraphicsContextGLANGLE::makeContextCurrent With a check on a thread-local variable with the tls_model("initial-exec") attribute, as implemented in the WIP patch: > CPU utilization of the WebProcess: > 17,924.20 msec task-clock # 0.597 CPUs utilized > Percentage of CPU utilization spent under and inside makeContextCurrent(): > 0.86% 0.66% WPEWebProcess libWPEWebKit-1.0.so.3.17.0 [.] WebCore::GraphicsContextGLANGLE::makeContextCurrent 1869361 3 459445 zan 2022-05-16 12:03:58 -0700 Created attachment 459445 Patch 1869363 4 459446 zan 2022-05-16 12:04:58 -0700 Created attachment 459446 Patch 1869385 5 459446 aperez 2022-05-16 13:25:29 -0700 Comment on attachment 459446 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=459446&action=review > Source/WebCore/ChangeLog:34 > + 'ELF Handling For Thread-Local Storage' paper by Ulrich Drepper. Reading this was good for a quick-ish summary for me: https://maskray.me/blog/2021-02-14-all-about-thread-local-storage 1869579 6 459481 zan 2022-05-16 22:39:01 -0700 Created attachment 459481 Patch for landing 1869581 7 459481 zan 2022-05-16 22:52:18 -0700 Comment on attachment 459481 Patch for landing Clearing flags on attachment: 459481 Committed r294290 (250632@trunk): <https://commits.webkit.org/250632@trunk> 1869582 8 zan 2022-05-16 22:52:24 -0700 All reviewed patches have been landed. Closing bug. 1869583 9 webkit-bug-importer 2022-05-16 22:53:13 -0700 <rdar://problem/93399978> 1975922 10 mcatanzaro 2023-09-06 14:44:50 -0700 Note this code has been deleted at some point. 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