63041 2011-06-20 20:18:08 -0700 [Chromium][V8] Make DOMDataStore per-isolate 2011-07-13 11:59:00 -0700 1 1 1 Unclassified WebKit WebCore JavaScript 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 61016 1 dslomov dslomov abarth antonm dimich dslomov vitalyr oldest_to_newest 424216 0 dslomov 2011-06-20 20:18:08 -0700 Another prerequisite to making WebWorkers per-isolate: make sure that DOMDataStore is accessible from multiple threads 424221 1 dslomov 2011-06-20 20:26:41 -0700 The hot spot for this work is getting current DOMDataStore. I have been experimenting with various implementation, and the following strategy recovers all perf on Dromaeo/?dom on Linux: Index: WebCore/bindings/v8/DOMData.cpp =================================================================== --- WebCore/bindings/v8/DOMData.cpp (revision 89232) +++ WebCore/bindings/v8/DOMData.cpp (working copy) @@ -53,12 +54,12 @@ DOMDataStore& DOMData::getMainThreadStore() { // This is broken out as a separate non-virtual method from getStore() // so that it can be inlined by getCurrentMainThreadStore, which is // a hot spot in Dromaeo DOM tests. - V8IsolatedContext* context = V8IsolatedContext::getEntered(); - if (UNLIKELY(context != 0)) - return *context->world()->domDataStore(); + DOMDataStore* currentDOMDataStore = V8BindingPerIsolateData::current()->getDOMDataStore(); + if (UNLIKELY(currentDOMDataStore != 0)) + return *currentDOMDataStore; return m_defaultStore; } I spare you all the gory details, but the idea is that: 1) current active DOMDataStore is saved in V8BindingPerIsolateData unless we are in main world 2) required changes include updating current DOMDataStore in per-isolate data on entering and exiting isolated worlds. 3) I keep m_defaultStore so that I do not have to reason about initialization order, but with the appearance of single V8 intitialization point in WebScriptController::inititialize, I might as well remove it too, and the whole function will then be return *V8BindingPerIsolateData::current()->getDOMDataStore(); 424226 2 dslomov 2011-06-20 20:29:48 -0700 Here is some prelim data on Linux (before/after): http://dromaeo.com/?id=142768,142775 there is even some minor speed-up (although dromaeo is crazy volatile, so don't believe it much) 424388 3 antonm 2011-06-21 05:11:12 -0700 (In reply to comment #2) > Here is some prelim data on Linux (before/after): > http://dromaeo.com/?id=142768,142775 > there is even some minor speed-up (although dromaeo is crazy volatile, so don't believe it much) Nice! Just FYI: this path should be hottest on DOM Query (we return the same element in the tight loop). So that definitely suppors your point that there is no perf regression. 435937 4 100559 dslomov 2011-07-12 14:08:52 -0700 Created attachment 100559 The fix The patch: - makes DOMData a static utility class - adds per-isolate DOMDataStore to V8BindingPerIsolateData dromaeo.com/?dom is not affected on Linux (Linux is a slow-TLS platform for V8): http://dromaeo.com/?id=144456,144540 435938 5 100559 dslomov 2011-07-12 14:09:50 -0700 Comment on attachment 100559 The fix (no cq yet - waiting for chromium trybots) 435998 6 100559 dslomov 2011-07-12 15:02:10 -0700 Comment on attachment 100559 The fix Errors on trybots. 436053 7 100582 dslomov 2011-07-12 16:19:54 -0700 Created attachment 100582 Added field initialization to V8BindingPerIsolateData constructor 436177 8 100582 dslomov 2011-07-12 19:40:10 -0700 Comment on attachment 100582 Added field initialization to V8BindingPerIsolateData constructor Chromium trybots are happy. 436180 9 100582 abarth 2011-07-12 19:45:02 -0700 Comment on attachment 100582 Added field initialization to V8BindingPerIsolateData constructor View in context: https://bugs.webkit.org/attachment.cgi?id=100582&action=review > Source/WebCore/bindings/v8/DOMData.h:56 > + static DOMDataStore& getCurrentStore(); Sorry to pick nits, but we usually skip the "get" prefix on these function names. > Source/WebCore/bindings/v8/V8Binding.h:114 > + DOMDataStore* getDOMDataStore() { return m_DOMDataStore; } > + void setDOMDataStore(DOMDataStore* store) { m_DOMDataStore = store; } We keep the "set" prefix though. I don't see where setDOMDataStore is ever called. How does m_DOMDataStore become non-null ? > Source/WebCore/bindings/v8/V8Binding.h:127 > + DOMDataStore* m_DOMDataStore; It's unclear to me what the ownership model for this pointer is, probably because I can't find anyone calling the setter. 436195 10 dslomov 2011-07-12 20:21:53 -0700 (In reply to comment #9) > (From update of attachment 100582 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=100582&action=review > > > Source/WebCore/bindings/v8/DOMData.h:56 > > + static DOMDataStore& getCurrentStore(); > > Sorry to pick nits, but we usually skip the "get" prefix on these function names. Sure, will fix. > > > Source/WebCore/bindings/v8/V8Binding.h:114 > > + DOMDataStore* getDOMDataStore() { return m_DOMDataStore; } > > + void setDOMDataStore(DOMDataStore* store) { m_DOMDataStore = store; } > > We keep the "set" prefix though. > > I don't see where setDOMDataStore is ever called. How does m_DOMDataStore become non-null ? This is the next patch :) The intent is that workers will do this. > > > Source/WebCore/bindings/v8/V8Binding.h:127 > > + DOMDataStore* m_DOMDataStore; > > It's unclear to me what the ownership model for this pointer is, probably because I can't find anyone calling the setter. This pointer is owned by someone outside V8BindingPerIsolateData. DOMDataStore is not a refcounted object, so RefPtr and such do not apply. 436199 11 100582 abarth 2011-07-12 20:26:45 -0700 Comment on attachment 100582 Added field initialization to V8BindingPerIsolateData constructor Ok. Looks like this pointer is going to have a complicated ownership model. Maybe we should add a comment explaining the ownership model? 436585 12 dslomov 2011-07-13 11:59:00 -0700 Commited in http://trac.webkit.org/changeset/90931. 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