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<title>[211099] branches/safari-603-branch/Source/JavaScriptCore</title>
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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/211099">211099</a></dd>
<dt>Author</dt> <dd>matthew_hanson@apple.com</dd>
<dt>Date</dt> <dd>2017-01-24 13:22:27 -0800 (Tue, 24 Jan 2017)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/210971">r210971</a>. rdar://problem/30115838</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branchessafari603branchSourceJavaScriptCoreChangeLog">branches/safari-603-branch/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#branchessafari603branchSourceJavaScriptCoredfgDFGPlancpp">branches/safari-603-branch/Source/JavaScriptCore/dfg/DFGPlan.cpp</a></li>
<li><a href="#branchessafari603branchSourceJavaScriptCoredfgDFGSafepointcpp">branches/safari-603-branch/Source/JavaScriptCore/dfg/DFGSafepoint.cpp</a></li>
<li><a href="#branchessafari603branchSourceJavaScriptCoreruntimeOptionsh">branches/safari-603-branch/Source/JavaScriptCore/runtime/Options.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="branchessafari603branchSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/JavaScriptCore/ChangeLog (211098 => 211099)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/JavaScriptCore/ChangeLog 2017-01-24 21:22:23 UTC (rev 211098)
+++ branches/safari-603-branch/Source/JavaScriptCore/ChangeLog 2017-01-24 21:22:27 UTC (rev 211099)
</span><span class="lines">@@ -1,3 +1,43 @@
</span><ins>+2017-01-24 Matthew Hanson <matthew_hanson@apple.com>
+
+ Merge r210971. rdar://problem/30115838
+
+ 2017-01-20 Saam Barati <sbarati@apple.com>
+
+ We should flash a safepoint before each DFG/FTL phase
+ https://bugs.webkit.org/show_bug.cgi?id=167234
+
+ Reviewed by Filip Pizlo.
+
+ The recent GC changes caused us to regress Kraken because of a
+ longstanding issue that happened to be hit with higher frequency because
+ of a change in timing between when a particular GC was happening and
+ when a particular FTL compilation was happening. The regression is caused
+ by the GC was waiting for a large function to make it through the DFG portion
+ of an FTL compilation. This was taking 20ms-30ms and started happened during a
+ particular test with much higher frequency.
+
+ This means that anytime the GC waits for this compilation, the test ran at least
+ ~20ms slower because the GC waits for the compiler threads the mutator is stopped.
+
+ It's good that we have such an easily reproducible case of this performance
+ issue because it will effect many real JS programs, especially ones with
+ large functions that get hot.
+
+ The most straight forward solution to fix this is to flash a safepoint before
+ each phase, allowing the GC to suspend the compiler if needed. In my testing,
+ this progresses Kraken in the browser, and doesn't regress anything else. This
+ solution also makes the most sense. I did some analysis on the compilation time
+ of this function that took ~20-30ms to pass through the DFG phases, and
+ the phase times were mostly evenly distributed. Some took longer than others,
+ but no phase was longer than 3ms. Most were in the 0.25ms to 1.5ms range.
+
+ * dfg/DFGPlan.cpp:
+ (JSC::DFG::Plan::compileInThreadImpl):
+ * dfg/DFGSafepoint.cpp:
+ (JSC::DFG::Safepoint::begin):
+ * runtime/Options.h:
+
</ins><span class="cx"> 2017-01-20 Matthew Hanson <matthew_hanson@apple.com>
</span><span class="cx">
</span><span class="cx"> Merge r210949. rdar://problem/30108531
</span></span></pre></div>
<a id="branchessafari603branchSourceJavaScriptCoredfgDFGPlancpp"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/JavaScriptCore/dfg/DFGPlan.cpp (211098 => 211099)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/JavaScriptCore/dfg/DFGPlan.cpp 2017-01-24 21:22:23 UTC (rev 211098)
+++ branches/safari-603-branch/Source/JavaScriptCore/dfg/DFGPlan.cpp 2017-01-24 21:22:27 UTC (rev 211099)
</span><span class="lines">@@ -254,6 +254,22 @@
</span><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> codeBlock->setCalleeSaveRegisters(RegisterSet::dfgCalleeSaveRegisters());
</span><ins>+
+ bool changed = false;
+
+#define RUN_PHASE(phase) \
+ do { \
+ if (Options::safepointBeforeEachPhase()) { \
+ Safepoint::Result safepointResult; \
+ { \
+ GraphSafepoint safepoint(dfg, safepointResult); \
+ } \
+ if (safepointResult.didGetCancelled()) \
+ return CancelPath; \
+ } \
+ changed |= phase(dfg); \
+ } while (false); \
+
</ins><span class="cx">
</span><span class="cx"> // By this point the DFG bytecode parser will have potentially mutated various tables
</span><span class="cx"> // in the CodeBlock. This is a good time to perform an early shrink, which is more
</span><span class="lines">@@ -269,16 +285,16 @@
</span><span class="cx"> dfg.dump();
</span><span class="cx"> }
</span><span class="cx">
</span><del>- performLiveCatchVariablePreservationPhase(dfg);
</del><ins>+ RUN_PHASE(performLiveCatchVariablePreservationPhase);
</ins><span class="cx">
</span><span class="cx"> if (Options::useMaximalFlushInsertionPhase())
</span><del>- performMaximalFlushInsertion(dfg);
</del><ins>+ RUN_PHASE(performMaximalFlushInsertion);
</ins><span class="cx">
</span><del>- performCPSRethreading(dfg);
- performUnification(dfg);
- performPredictionInjection(dfg);
</del><ins>+ RUN_PHASE(performCPSRethreading);
+ RUN_PHASE(performUnification);
+ RUN_PHASE(performPredictionInjection);
</ins><span class="cx">
</span><del>- performStaticExecutionCountEstimation(dfg);
</del><ins>+ RUN_PHASE(performStaticExecutionCountEstimation);
</ins><span class="cx">
</span><span class="cx"> if (mode == FTLForOSREntryMode) {
</span><span class="cx"> bool result = performOSREntrypointCreation(dfg);
</span><span class="lines">@@ -286,18 +302,18 @@
</span><span class="cx"> finalizer = std::make_unique<FailedFinalizer>(*this);
</span><span class="cx"> return FailPath;
</span><span class="cx"> }
</span><del>- performCPSRethreading(dfg);
</del><ins>+ RUN_PHASE(performCPSRethreading);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> if (validationEnabled())
</span><span class="cx"> validate(dfg);
</span><span class="cx">
</span><del>- performBackwardsPropagation(dfg);
- performPredictionPropagation(dfg);
- performFixup(dfg);
- performStructureRegistration(dfg);
- performInvalidationPointInjection(dfg);
- performTypeCheckHoisting(dfg);
</del><ins>+ RUN_PHASE(performBackwardsPropagation);
+ RUN_PHASE(performPredictionPropagation);
+ RUN_PHASE(performFixup);
+ RUN_PHASE(performStructureRegistration);
+ RUN_PHASE(performInvalidationPointInjection);
+ RUN_PHASE(performTypeCheckHoisting);
</ins><span class="cx">
</span><span class="cx"> dfg.m_fixpointState = FixpointNotConverged;
</span><span class="cx">
</span><span class="lines">@@ -309,18 +325,18 @@
</span><span class="cx"> if (validationEnabled())
</span><span class="cx"> validate(dfg);
</span><span class="cx">
</span><del>- performStrengthReduction(dfg);
- performCPSRethreading(dfg);
- performCFA(dfg);
- performConstantFolding(dfg);
- bool changed = false;
- changed |= performCFGSimplification(dfg);
- changed |= performLocalCSE(dfg);
</del><ins>+ RUN_PHASE(performStrengthReduction);
+ RUN_PHASE(performCPSRethreading);
+ RUN_PHASE(performCFA);
+ RUN_PHASE(performConstantFolding);
+ changed = false;
+ RUN_PHASE(performCFGSimplification);
+ RUN_PHASE(performLocalCSE);
</ins><span class="cx">
</span><span class="cx"> if (validationEnabled())
</span><span class="cx"> validate(dfg);
</span><span class="cx">
</span><del>- performCPSRethreading(dfg);
</del><ins>+ RUN_PHASE(performCPSRethreading);
</ins><span class="cx"> if (!isFTL(mode)) {
</span><span class="cx"> // Only run this if we're not FTLing, because currently for a LoadVarargs that is forwardable and
</span><span class="cx"> // in a non-varargs inlined call frame, this will generate ForwardVarargs while the FTL
</span><span class="lines">@@ -341,11 +357,11 @@
</span><span class="cx"> // ArgumentsEliminationPhase does everything that this phase does, and it doesn't introduce this
</span><span class="cx"> // pathology.
</span><span class="cx">
</span><del>- changed |= performVarargsForwarding(dfg); // Do this after CFG simplification and CPS rethreading.
</del><ins>+ RUN_PHASE(performVarargsForwarding); // Do this after CFG simplification and CPS rethreading.
</ins><span class="cx"> }
</span><span class="cx"> if (changed) {
</span><del>- performCFA(dfg);
- performConstantFolding(dfg);
</del><ins>+ RUN_PHASE(performCFA);
+ RUN_PHASE(performConstantFolding);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> // If we're doing validation, then run some analyses, to give them an opportunity
</span><span class="lines">@@ -360,17 +376,17 @@
</span><span class="cx"> case DFGMode: {
</span><span class="cx"> dfg.m_fixpointState = FixpointConverged;
</span><span class="cx">
</span><del>- performTierUpCheckInjection(dfg);
</del><ins>+ RUN_PHASE(performTierUpCheckInjection);
</ins><span class="cx">
</span><del>- performFastStoreBarrierInsertion(dfg);
- performStoreBarrierClustering(dfg);
- performCleanUp(dfg);
- performCPSRethreading(dfg);
- performDCE(dfg);
- performPhantomInsertion(dfg);
- performStackLayout(dfg);
- performVirtualRegisterAllocation(dfg);
- performWatchpointCollection(dfg);
</del><ins>+ RUN_PHASE(performFastStoreBarrierInsertion);
+ RUN_PHASE(performStoreBarrierClustering);
+ RUN_PHASE(performCleanUp);
+ RUN_PHASE(performCPSRethreading);
+ RUN_PHASE(performDCE);
+ RUN_PHASE(performPhantomInsertion);
+ RUN_PHASE(performStackLayout);
+ RUN_PHASE(performVirtualRegisterAllocation);
+ RUN_PHASE(performWatchpointCollection);
</ins><span class="cx"> dumpAndVerifyGraph(dfg, "Graph after optimization:");
</span><span class="cx">
</span><span class="cx"> JITCompiler dataFlowJIT(dfg);
</span><span class="lines">@@ -390,37 +406,37 @@
</span><span class="cx"> return FailPath;
</span><span class="cx"> }
</span><span class="cx">
</span><del>- performCleanUp(dfg); // Reduce the graph size a bit.
- performCriticalEdgeBreaking(dfg);
</del><ins>+ RUN_PHASE(performCleanUp); // Reduce the graph size a bit.
+ RUN_PHASE(performCriticalEdgeBreaking);
</ins><span class="cx"> if (Options::createPreHeaders())
</span><del>- performLoopPreHeaderCreation(dfg);
- performCPSRethreading(dfg);
- performSSAConversion(dfg);
- performSSALowering(dfg);
</del><ins>+ RUN_PHASE(performLoopPreHeaderCreation);
+ RUN_PHASE(performCPSRethreading);
+ RUN_PHASE(performSSAConversion);
+ RUN_PHASE(performSSALowering);
</ins><span class="cx">
</span><span class="cx"> // Ideally, these would be run to fixpoint with the object allocation sinking phase.
</span><del>- performArgumentsElimination(dfg);
</del><ins>+ RUN_PHASE(performArgumentsElimination);
</ins><span class="cx"> if (Options::usePutStackSinking())
</span><del>- performPutStackSinking(dfg);
</del><ins>+ RUN_PHASE(performPutStackSinking);
</ins><span class="cx">
</span><del>- performConstantHoisting(dfg);
- performGlobalCSE(dfg);
- performLivenessAnalysis(dfg);
- performCFA(dfg);
- performConstantFolding(dfg);
- performCleanUp(dfg); // Reduce the graph size a lot.
</del><ins>+ RUN_PHASE(performConstantHoisting);
+ RUN_PHASE(performGlobalCSE);
+ RUN_PHASE(performLivenessAnalysis);
+ RUN_PHASE(performCFA);
+ RUN_PHASE(performConstantFolding);
+ RUN_PHASE(performCleanUp); // Reduce the graph size a lot.
</ins><span class="cx"> changed = false;
</span><del>- changed |= performStrengthReduction(dfg);
</del><ins>+ RUN_PHASE(performStrengthReduction);
</ins><span class="cx"> if (Options::useObjectAllocationSinking()) {
</span><del>- changed |= performCriticalEdgeBreaking(dfg);
- changed |= performObjectAllocationSinking(dfg);
</del><ins>+ RUN_PHASE(performCriticalEdgeBreaking);
+ RUN_PHASE(performObjectAllocationSinking);
</ins><span class="cx"> }
</span><span class="cx"> if (changed) {
</span><span class="cx"> // State-at-tail and state-at-head will be invalid if we did strength reduction since
</span><span class="cx"> // it might increase live ranges.
</span><del>- performLivenessAnalysis(dfg);
- performCFA(dfg);
- performConstantFolding(dfg);
</del><ins>+ RUN_PHASE(performLivenessAnalysis);
+ RUN_PHASE(performCFA);
+ RUN_PHASE(performConstantFolding);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> // Currently, this relies on pre-headers still being valid. That precludes running CFG
</span><span class="lines">@@ -428,9 +444,9 @@
</span><span class="cx"> // wrong with running LICM earlier, if we wanted to put other CFG transforms above this point.
</span><span class="cx"> // Alternatively, we could run loop pre-header creation after SSA conversion - but if we did that
</span><span class="cx"> // then we'd need to do some simple SSA fix-up.
</span><del>- performLivenessAnalysis(dfg);
- performCFA(dfg);
- performLICM(dfg);
</del><ins>+ RUN_PHASE(performLivenessAnalysis);
+ RUN_PHASE(performCFA);
+ RUN_PHASE(performLICM);
</ins><span class="cx">
</span><span class="cx"> // FIXME: Currently: IntegerRangeOptimization *must* be run after LICM.
</span><span class="cx"> //
</span><span class="lines">@@ -439,29 +455,29 @@
</span><span class="cx"> // by IntegerRangeOptimization.
</span><span class="cx"> //
</span><span class="cx"> // Ideally, the dependencies should be explicit. See https://bugs.webkit.org/show_bug.cgi?id=157534.
</span><del>- performLivenessAnalysis(dfg);
- performIntegerRangeOptimization(dfg);
</del><ins>+ RUN_PHASE(performLivenessAnalysis);
+ RUN_PHASE(performIntegerRangeOptimization);
</ins><span class="cx">
</span><del>- performCleanUp(dfg);
- performIntegerCheckCombining(dfg);
- performGlobalCSE(dfg);
</del><ins>+ RUN_PHASE(performCleanUp);
+ RUN_PHASE(performIntegerCheckCombining);
+ RUN_PHASE(performGlobalCSE);
</ins><span class="cx">
</span><span class="cx"> // At this point we're not allowed to do any further code motion because our reasoning
</span><span class="cx"> // about code motion assumes that it's OK to insert GC points in random places.
</span><span class="cx"> dfg.m_fixpointState = FixpointConverged;
</span><span class="cx">
</span><del>- performLivenessAnalysis(dfg);
- performCFA(dfg);
- performGlobalStoreBarrierInsertion(dfg);
- performStoreBarrierClustering(dfg);
</del><ins>+ RUN_PHASE(performLivenessAnalysis);
+ RUN_PHASE(performCFA);
+ RUN_PHASE(performGlobalStoreBarrierInsertion);
+ RUN_PHASE(performStoreBarrierClustering);
</ins><span class="cx"> if (Options::useMovHintRemoval())
</span><del>- performMovHintRemoval(dfg);
- performCleanUp(dfg);
- performDCE(dfg); // We rely on this to kill dead code that won't be recognized as dead by B3.
- performStackLayout(dfg);
- performLivenessAnalysis(dfg);
- performOSRAvailabilityAnalysis(dfg);
- performWatchpointCollection(dfg);
</del><ins>+ RUN_PHASE(performMovHintRemoval);
+ RUN_PHASE(performCleanUp);
+ RUN_PHASE(performDCE); // We rely on this to kill dead code that won't be recognized as dead by B3.
+ RUN_PHASE(performStackLayout);
+ RUN_PHASE(performLivenessAnalysis);
+ RUN_PHASE(performOSRAvailabilityAnalysis);
+ RUN_PHASE(performWatchpointCollection);
</ins><span class="cx">
</span><span class="cx"> if (FTL::canCompile(dfg) == FTL::CannotCompile) {
</span><span class="cx"> finalizer = std::make_unique<FailedFinalizer>(*this);
</span><span class="lines">@@ -521,6 +537,8 @@
</span><span class="cx"> RELEASE_ASSERT_NOT_REACHED();
</span><span class="cx"> return FailPath;
</span><span class="cx"> }
</span><ins>+
+#undef RUN_PHASE
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> bool Plan::isStillValid()
</span></span></pre></div>
<a id="branchessafari603branchSourceJavaScriptCoredfgDFGSafepointcpp"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/JavaScriptCore/dfg/DFGSafepoint.cpp (211098 => 211099)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/JavaScriptCore/dfg/DFGSafepoint.cpp 2017-01-24 21:22:23 UTC (rev 211098)
+++ branches/safari-603-branch/Source/JavaScriptCore/dfg/DFGSafepoint.cpp 2017-01-24 21:22:27 UTC (rev 211099)
</span><span class="lines">@@ -1,5 +1,5 @@
</span><span class="cx"> /*
</span><del>- * Copyright (C) 2014, 2016 Apple Inc. All rights reserved.
</del><ins>+ * Copyright (C) 2014-2017 Apple Inc. All rights reserved.
</ins><span class="cx"> *
</span><span class="cx"> * Redistribution and use in source and binary forms, with or without
</span><span class="cx"> * modification, are permitted provided that the following conditions
</span><span class="lines">@@ -80,7 +80,7 @@
</span><span class="cx"> if (ThreadData* data = m_plan.threadData) {
</span><span class="cx"> RELEASE_ASSERT(!data->m_safepoint);
</span><span class="cx"> data->m_safepoint = this;
</span><del>- data->m_rightToRun.unlock();
</del><ins>+ data->m_rightToRun.unlockFairly();
</ins><span class="cx"> }
</span><span class="cx"> }
</span><span class="cx">
</span></span></pre></div>
<a id="branchessafari603branchSourceJavaScriptCoreruntimeOptionsh"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/JavaScriptCore/runtime/Options.h (211098 => 211099)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/JavaScriptCore/runtime/Options.h 2017-01-24 21:22:23 UTC (rev 211098)
+++ branches/safari-603-branch/Source/JavaScriptCore/runtime/Options.h 2017-01-24 21:22:27 UTC (rev 211099)
</span><span class="lines">@@ -158,6 +158,7 @@
</span><span class="cx"> v(bool, dumpB3GraphAtEachPhase, false, Normal, "dumps the B3 graph at each phase of compilation") \
</span><span class="cx"> v(bool, dumpAirGraphAtEachPhase, false, Normal, "dumps the Air graph at each phase of compilation") \
</span><span class="cx"> v(bool, verboseDFGByteCodeParsing, false, Normal, nullptr) \
</span><ins>+ v(bool, safepointBeforeEachPhase, true, Normal, nullptr) \
</ins><span class="cx"> v(bool, verboseCompilation, false, Normal, nullptr) \
</span><span class="cx"> v(bool, verboseFTLCompilation, false, Normal, nullptr) \
</span><span class="cx"> v(bool, logCompilationChanges, false, Normal, nullptr) \
</span></span></pre>
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