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<title>[210878] branches/safari-603-branch/Source/WebCore</title>
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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/210878">210878</a></dd>
<dt>Author</dt> <dd>matthew_hanson@apple.com</dd>
<dt>Date</dt> <dd>2017-01-18 12:43:40 -0800 (Wed, 18 Jan 2017)</dd>
</dl>

<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/210733">r210733</a>. rdar://problem/30014496</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#branchessafari603branchSourceWebCoreCMakeListstxt">branches/safari-603-branch/Source/WebCore/CMakeLists.txt</a></li>
<li><a href="#branchessafari603branchSourceWebCoreChangeLog">branches/safari-603-branch/Source/WebCore/ChangeLog</a></li>
<li><a href="#branchessafari603branchSourceWebCoreWebCorexcodeprojprojectpbxproj">branches/safari-603-branch/Source/WebCore/WebCore.xcodeproj/project.pbxproj</a></li>
<li><a href="#branchessafari603branchSourceWebCoreloaderFrameLoadercpp">branches/safari-603-branch/Source/WebCore/loader/FrameLoader.cpp</a></li>
<li><a href="#branchessafari603branchSourceWebCorepageDiagnosticLoggingKeyscpp">branches/safari-603-branch/Source/WebCore/page/DiagnosticLoggingKeys.cpp</a></li>
<li><a href="#branchessafari603branchSourceWebCorepageDiagnosticLoggingKeysh">branches/safari-603-branch/Source/WebCore/page/DiagnosticLoggingKeys.h</a></li>
<li><a href="#branchessafari603branchSourceWebCorepagePagecpp">branches/safari-603-branch/Source/WebCore/page/Page.cpp</a></li>
<li><a href="#branchessafari603branchSourceWebCorepagePageh">branches/safari-603-branch/Source/WebCore/page/Page.h</a></li>
<li><a href="#branchessafari603branchSourceWebCorepageSettingscpp">branches/safari-603-branch/Source/WebCore/page/Settings.cpp</a></li>
<li><a href="#branchessafari603branchSourceWebCorepageSettingsh">branches/safari-603-branch/Source/WebCore/page/Settings.h</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#branchessafari603branchSourceWebCoreplatformCPUTimecpp">branches/safari-603-branch/Source/WebCore/platform/CPUTime.cpp</a></li>
<li><a href="#branchessafari603branchSourceWebCoreplatformCPUTimeh">branches/safari-603-branch/Source/WebCore/platform/CPUTime.h</a></li>
<li><a href="#branchessafari603branchSourceWebCoreplatformcocoaCPUTimeCocoamm">branches/safari-603-branch/Source/WebCore/platform/cocoa/CPUTimeCocoa.mm</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="branchessafari603branchSourceWebCoreCMakeListstxt"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/WebCore/CMakeLists.txt (210877 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/CMakeLists.txt        2017-01-18 20:43:34 UTC (rev 210877)
+++ branches/safari-603-branch/Source/WebCore/CMakeLists.txt        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -2123,6 +2123,7 @@
</span><span class="cx">     page/scrolling/ScrollingTreeScrollingNode.cpp
</span><span class="cx">     page/scrolling/ThreadedScrollingTree.cpp
</span><span class="cx"> 
</span><ins>+    platform/CPUTime.cpp
</ins><span class="cx">     platform/CalculationValue.cpp
</span><span class="cx">     platform/Clock.cpp
</span><span class="cx">     platform/ClockGeneric.cpp
</span></span></pre></div>
<a id="branchessafari603branchSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/WebCore/ChangeLog (210877 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/ChangeLog        2017-01-18 20:43:34 UTC (rev 210877)
+++ branches/safari-603-branch/Source/WebCore/ChangeLog        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -1,5 +1,57 @@
</span><span class="cx"> 2017-01-18  Matthew Hanson  &lt;matthew_hanson@apple.com&gt;
</span><span class="cx"> 
</span><ins>+        Merge r210733. rdar://problem/30014496
+
+    2017-01-13  Chris Dumez  &lt;cdumez@apple.com&gt;
+
+            Report post-page load CPU usage using diagnostic logging
+            https://bugs.webkit.org/show_bug.cgi?id=166950
+            &lt;rdar://problem/30014496&gt;
+
+            Reviewed by Alex Christensen.
+
+            Shortly after page load (5 seconds), we measure the WebContent process'
+            CPU usage over 10 seconds and report the percentage back via release
+            logging. We also log the percentage using diagnostic logging using the
+            following buckets:
+            - Below 10%
+            - 10 to 20%
+            - 20 to 40%
+            - 60 to 80%
+            - Over 80%
+
+            The logging works on both Mac and iOS. I verified that I get results
+            consistent with Activity Monitor or top.
+
+            No new tests, no Web-facing behavior change, only extra logging.
+
+            * CMakeLists.txt:
+            * WebCore.xcodeproj/project.pbxproj:
+            * loader/FrameLoader.cpp:
+            (WebCore::FrameLoader::checkLoadCompleteForThisFrame):
+            * page/DiagnosticLoggingKeys.cpp:
+            (WebCore::DiagnosticLoggingKeys::postPageLoadKey):
+            (WebCore::DiagnosticLoggingKeys::cpuUsageKey):
+            * page/DiagnosticLoggingKeys.h:
+            * page/Page.cpp:
+            (WebCore::Page::Page):
+            (WebCore::Page::didFinishLoad):
+            (WebCore::cpuUsageToDiagnosticLogginKey):
+            (WebCore::Page::measurePostLoadCPUUsage):
+            * page/Page.h:
+            * page/Settings.cpp:
+            (WebCore::Settings::isPostLoadCPUUsageMeasurementEnabled):
+            * page/Settings.h:
+            * platform/CPUTime.cpp: Added.
+            (WebCore::getCPUTime):
+            (WebCore::CPUTime::percentageCPUUsageSince):
+            * platform/CPUTime.h: Added.
+            * platform/cocoa/CPUTimeCocoa.mm: Added.
+            (WebCore::timeValueToMicroseconds):
+            (WebCore::getCPUTime):
+
+2017-01-18  Matthew Hanson  &lt;matthew_hanson@apple.com&gt;
+
</ins><span class="cx">         Merge r210762. rdar://problem/29883469
</span><span class="cx"> 
</span><span class="cx">     2017-01-13  Alex Christensen  &lt;achristensen@webkit.org&gt;
</span></span></pre></div>
<a id="branchessafari603branchSourceWebCoreWebCorexcodeprojprojectpbxproj"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/WebCore/WebCore.xcodeproj/project.pbxproj (210877 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/WebCore.xcodeproj/project.pbxproj        2017-01-18 20:43:34 UTC (rev 210877)
+++ branches/safari-603-branch/Source/WebCore/WebCore.xcodeproj/project.pbxproj        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -1741,6 +1741,9 @@
</span><span class="cx">                 460CBF351D4BCD0E0092E88E /* JSDOMWindowProperties.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 460CBF331D4BCCFE0092E88E /* JSDOMWindowProperties.cpp */; };
</span><span class="cx">                 460CBF361D4BCD0E0092E88E /* JSDOMWindowProperties.h in Headers */ = {isa = PBXBuildFile; fileRef = 460CBF341D4BCCFE0092E88E /* JSDOMWindowProperties.h */; };
</span><span class="cx">                 4634592C1AC2271000ECB71C /* PowerObserverMac.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4634592B1AC2271000ECB71C /* PowerObserverMac.cpp */; };
</span><ins>+                463763081E26FDD7008CD46D /* CPUTime.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 463763061E26FDBA008CD46D /* CPUTime.cpp */; };
+                463763091E26FDD7008CD46D /* CPUTime.h in Headers */ = {isa = PBXBuildFile; fileRef = 463763071E26FDBA008CD46D /* CPUTime.h */; settings = {ATTRIBUTES = (Private, ); }; };
+                4637630B1E26FDF6008CD46D /* CPUTimeCocoa.mm in Sources */ = {isa = PBXBuildFile; fileRef = 4637630A1E26FDEB008CD46D /* CPUTimeCocoa.mm */; };
</ins><span class="cx">                 463EB6221B8789E00096ED51 /* TagCollection.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 463EB6201B8789CB0096ED51 /* TagCollection.cpp */; };
</span><span class="cx">                 463EB6231B8789E00096ED51 /* TagCollection.h in Headers */ = {isa = PBXBuildFile; fileRef = 463EB6211B8789CB0096ED51 /* TagCollection.h */; };
</span><span class="cx">                 465307D01DB6EE4800E4137C /* JSUIEventInit.h in Headers */ = {isa = PBXBuildFile; fileRef = 83E045EF1DAA104F00B0D8B9 /* JSUIEventInit.h */; };
</span><span class="lines">@@ -8960,6 +8963,9 @@
</span><span class="cx">                 460CBF331D4BCCFE0092E88E /* JSDOMWindowProperties.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = JSDOMWindowProperties.cpp; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="cx">                 460CBF341D4BCCFE0092E88E /* JSDOMWindowProperties.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSDOMWindowProperties.h; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="cx">                 4634592B1AC2271000ECB71C /* PowerObserverMac.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = PowerObserverMac.cpp; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><ins>+                463763061E26FDBA008CD46D /* CPUTime.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = CPUTime.cpp; sourceTree = &quot;&lt;group&gt;&quot;; };
+                463763071E26FDBA008CD46D /* CPUTime.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = CPUTime.h; sourceTree = &quot;&lt;group&gt;&quot;; };
+                4637630A1E26FDEB008CD46D /* CPUTimeCocoa.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = CPUTimeCocoa.mm; sourceTree = &quot;&lt;group&gt;&quot;; };
</ins><span class="cx">                 463EB6201B8789CB0096ED51 /* TagCollection.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = TagCollection.cpp; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="cx">                 463EB6211B8789CB0096ED51 /* TagCollection.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = TagCollection.h; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="cx">                 465A8E781C8A24CE00E7D3E4 /* RuntimeApplicationChecks.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = RuntimeApplicationChecks.mm; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="lines">@@ -19723,6 +19729,7 @@
</span><span class="cx">                 A5C974CE11485FDA0066F2AB /* cocoa */ = {
</span><span class="cx">                         isa = PBXGroup;
</span><span class="cx">                         children = (
</span><ins>+                                4637630A1E26FDEB008CD46D /* CPUTimeCocoa.mm */,
</ins><span class="cx">                                 A14090FA1AA51E1D0091191A /* ContentFilterUnblockHandlerCocoa.mm */,
</span><span class="cx">                                 CD7D33451C7A16BF00041293 /* CoreVideoSoftLink.cpp */,
</span><span class="cx">                                 CD7D33461C7A16BF00041293 /* CoreVideoSoftLink.h */,
</span><span class="lines">@@ -22546,6 +22553,8 @@
</span><span class="cx">                                 653EF83619A043AE0052202C /* spi */,
</span><span class="cx">                                 1A2E6E560CC551E0004A2062 /* sql */,
</span><span class="cx">                                 B2C3D9EC0D006C1D00EF6F26 /* text */,
</span><ins>+                                463763061E26FDBA008CD46D /* CPUTime.cpp */,
+                                463763071E26FDBA008CD46D /* CPUTime.h */,
</ins><span class="cx">                                 49AE2D94134EE5F90072920A /* CalculationValue.cpp */,
</span><span class="cx">                                 49AE2D95134EE5F90072920A /* CalculationValue.h */,
</span><span class="cx">                                 CDEA76331460B462008B31F1 /* Clock.cpp */,
</span><span class="lines">@@ -28298,6 +28307,7 @@
</span><span class="cx">                                 6EBF0E5512A8929800DB1709 /* WebGLExtension.h in Headers */,
</span><span class="cx">                                 49C7B9CF1042D32F0009D447 /* WebGLFramebuffer.h in Headers */,
</span><span class="cx">                                 6E47E66110B7944B00B186C8 /* WebGLGetInfo.h in Headers */,
</span><ins>+                                463763091E26FDD7008CD46D /* CPUTime.h in Headers */,
</ins><span class="cx">                                 49FFBF3F11C93EE3006A7118 /* WebGLLayer.h in Headers */,
</span><span class="cx">                                 93F1D5BB12D532C400832BEC /* WebGLLoseContext.h in Headers */,
</span><span class="cx">                                 49C7B9D51042D32F0009D447 /* WebGLObject.h in Headers */,
</span><span class="lines">@@ -29949,6 +29959,7 @@
</span><span class="cx">                                 2E0888D41148848A00AF4265 /* JSDOMFormData.cpp in Sources */,
</span><span class="cx">                                 E1C36CBD0EB08062007410BC /* JSDOMGlobalObject.cpp in Sources */,
</span><span class="cx">                                 7C2BDD3D17C7F98C0038FF15 /* JSDOMGlobalObjectTask.cpp in Sources */,
</span><ins>+                                463763081E26FDD7008CD46D /* CPUTime.cpp in Sources */,
</ins><span class="cx">                                 65DF31F709D1CC60000BE325 /* JSDOMImplementation.cpp in Sources */,
</span><span class="cx">                                 9479493C1E045CF300018D85 /* DeprecatedCSSOMPrimitiveValue.cpp in Sources */,
</span><span class="cx">                                 4138F8571D253F08001CB61E /* JSDOMIterator.cpp in Sources */,
</span><span class="lines">@@ -30118,6 +30129,7 @@
</span><span class="cx">                                 BC06ED9F0BFD660600856E9D /* JSHTMLTableRowElement.cpp in Sources */,
</span><span class="cx">                                 BC06ED060BFD5BAE00856E9D /* JSHTMLTableSectionElement.cpp in Sources */,
</span><span class="cx">                                 D6489D25166FFCF1007C031B /* JSHTMLTemplateElement.cpp in Sources */,
</span><ins>+                                4637630B1E26FDF6008CD46D /* CPUTimeCocoa.mm in Sources */,
</ins><span class="cx">                                 D6F7960D166FFECE0076DD18 /* JSHTMLTemplateElementCustom.cpp in Sources */,
</span><span class="cx">                                 A80E7E9E0A1A83E3007FB8C5 /* JSHTMLTextAreaElement.cpp in Sources */,
</span><span class="cx">                                 83E359A31BB1031D002CEB98 /* JSHTMLTimeElement.cpp in Sources */,
</span></span></pre></div>
<a id="branchessafari603branchSourceWebCoreloaderFrameLoadercpp"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/WebCore/loader/FrameLoader.cpp (210877 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/loader/FrameLoader.cpp        2017-01-18 20:43:34 UTC (rev 210877)
+++ branches/safari-603-branch/Source/WebCore/loader/FrameLoader.cpp        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -992,6 +992,11 @@
</span><span class="cx">         m_stateMachine.advanceTo(FrameLoaderStateMachine::CommittedFirstRealLoad);
</span><span class="cx">     m_frame.navigationScheduler().cancel(true);
</span><span class="cx">     m_client.provisionalLoadStarted();
</span><ins>+
+    if (m_frame.isMainFrame()) {
+        if (auto* page = m_frame.page())
+            page-&gt;didStartProvisionalLoad();
+    }
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> void FrameLoader::resetMultipleFormSubmissionProtection()
</span><span class="lines">@@ -2294,7 +2299,7 @@
</span><span class="cx">             Page* page = m_frame.page();
</span><span class="cx">             if (page) {
</span><span class="cx">                 if (m_frame.isMainFrame())
</span><del>-                    page-&gt;resetRelevantPaintedObjectCounter();
</del><ins>+                    page-&gt;didFinishLoad();
</ins><span class="cx">             }
</span><span class="cx"> 
</span><span class="cx">             const ResourceError&amp; error = dl-&gt;mainDocumentError();
</span></span></pre></div>
<a id="branchessafari603branchSourceWebCorepageDiagnosticLoggingKeyscpp"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/WebCore/page/DiagnosticLoggingKeys.cpp (210877 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/page/DiagnosticLoggingKeys.cpp        2017-01-18 20:43:34 UTC (rev 210877)
+++ branches/safari-603-branch/Source/WebCore/page/DiagnosticLoggingKeys.cpp        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -53,6 +53,11 @@
</span><span class="cx">     return ASCIILiteral(&quot;pluginFailedLoading&quot;);
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+String DiagnosticLoggingKeys::postPageLoadKey()
+{
+    return ASCIILiteral(&quot;postPageLoad&quot;);
+}
+
</ins><span class="cx"> String DiagnosticLoggingKeys::provisionalLoadKey()
</span><span class="cx"> {
</span><span class="cx">     return ASCIILiteral(&quot;provisionalLoad&quot;);
</span><span class="lines">@@ -308,6 +313,11 @@
</span><span class="cx">     return ASCIILiteral(&quot;cannotSuspendActiveDOMObjects&quot;);
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+String DiagnosticLoggingKeys::cpuUsageKey()
+{
+    return ASCIILiteral(&quot;cpuUsage&quot;);
+}
+
</ins><span class="cx"> String DiagnosticLoggingKeys::createSharedBufferFailedKey()
</span><span class="cx"> {
</span><span class="cx">     return ASCIILiteral(&quot;createSharedBufferFailed&quot;);
</span></span></pre></div>
<a id="branchessafari603branchSourceWebCorepageDiagnosticLoggingKeysh"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/WebCore/page/DiagnosticLoggingKeys.h (210877 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/page/DiagnosticLoggingKeys.h        2017-01-18 20:43:34 UTC (rev 210877)
+++ branches/safari-603-branch/Source/WebCore/page/DiagnosticLoggingKeys.h        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -40,6 +40,7 @@
</span><span class="cx">     static String cachedResourceRevalidationKey();
</span><span class="cx">     static String canCacheKey();
</span><span class="cx">     static String cannotSuspendActiveDOMObjectsKey();
</span><ins>+    static String cpuUsageKey();
</ins><span class="cx">     WEBCORE_EXPORT static String createSharedBufferFailedKey();
</span><span class="cx">     WEBCORE_EXPORT static String deltaKey();
</span><span class="cx">     static String deniedByClientKey();
</span><span class="lines">@@ -100,6 +101,7 @@
</span><span class="cx">     static String playedKey();
</span><span class="cx">     static String pluginLoadedKey();
</span><span class="cx">     static String pluginLoadingFailedKey();
</span><ins>+    static String postPageLoadKey();
</ins><span class="cx">     static String provisionalLoadKey();
</span><span class="cx">     static String prunedDueToMaxSizeReached();
</span><span class="cx">     static String prunedDueToMemoryPressureKey();
</span></span></pre></div>
<a id="branchessafari603branchSourceWebCorepagePagecpp"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/WebCore/page/Page.cpp (210877 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/page/Page.cpp        2017-01-18 20:43:34 UTC (rev 210877)
+++ branches/safari-603-branch/Source/WebCore/page/Page.cpp        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -33,6 +33,7 @@
</span><span class="cx"> #include &quot;ContextMenuController.h&quot;
</span><span class="cx"> #include &quot;DatabaseProvider.h&quot;
</span><span class="cx"> #include &quot;DiagnosticLoggingClient.h&quot;
</span><ins>+#include &quot;DiagnosticLoggingKeys.h&quot;
</ins><span class="cx"> #include &quot;DocumentLoader.h&quot;
</span><span class="cx"> #include &quot;DocumentMarkerController.h&quot;
</span><span class="cx"> #include &quot;DragController.h&quot;
</span><span class="lines">@@ -98,6 +99,7 @@
</span><span class="cx"> #include &quot;VoidCallback.h&quot;
</span><span class="cx"> #include &quot;WebGLStateTracker.h&quot;
</span><span class="cx"> #include &quot;Widget.h&quot;
</span><ins>+#include &lt;wtf/CurrentTime.h&gt;
</ins><span class="cx"> #include &lt;wtf/RefCountedLeakCounter.h&gt;
</span><span class="cx"> #include &lt;wtf/StdLibExtras.h&gt;
</span><span class="cx"> #include &lt;wtf/text/Base64.h&gt;
</span><span class="lines">@@ -124,8 +126,13 @@
</span><span class="cx"> 
</span><span class="cx"> namespace WebCore {
</span><span class="cx"> 
</span><ins>+#define RELEASE_LOG_IF_ALLOWED(channel, fmt, ...) RELEASE_LOG_IF(isAlwaysOnLoggingAllowed(), channel, &quot;%p - Page::&quot; fmt, this, ##__VA_ARGS__)
+
</ins><span class="cx"> static HashSet&lt;Page*&gt;* allPages;
</span><span class="cx"> 
</span><ins>+static const std::chrono::seconds cpuUsageMeasurementDelay { 5 };
+static const std::chrono::seconds cpuUsageMeasurementDuration { 10 };
+
</ins><span class="cx"> DEFINE_DEBUG_ONLY_GLOBAL(WTF::RefCountedLeakCounter, pageCounter, (&quot;Page&quot;));
</span><span class="cx"> 
</span><span class="cx"> void Page::forEachPage(std::function&lt;void(Page&amp;)&gt; function)
</span><span class="lines">@@ -244,6 +251,7 @@
</span><span class="cx">     , m_visitedLinkStore(*WTFMove(pageConfiguration.visitedLinkStore))
</span><span class="cx">     , m_sessionID(SessionID::defaultSessionID())
</span><span class="cx">     , m_isClosing(false)
</span><ins>+    , m_cpuUsageMeasurementTimer(*this, &amp;Page::measurePostLoadCPUUsage)
</ins><span class="cx"> {
</span><span class="cx">     updateTimerThrottlingState();
</span><span class="cx"> 
</span><span class="lines">@@ -925,6 +933,55 @@
</span><span class="cx"> #endif
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+void Page::didStartProvisionalLoad()
+{
+    m_postLoadCPUTime = std::nullopt;
+    m_cpuUsageMeasurementTimer.stop();
+}
+
+void Page::didFinishLoad()
+{
+    resetRelevantPaintedObjectCounter();
+
+    // Only do post-load CPU usage measurement if there is a single Page in the process in order to reduce noise.
+    if (Settings::isPostLoadCPUUsageMeasurementEnabled() &amp;&amp; allPages-&gt;size() == 1) {
+        m_postLoadCPUTime = std::nullopt;
+        m_cpuUsageMeasurementTimer.startOneShot(cpuUsageMeasurementDelay);
+    }
+}
+
+static String cpuUsageToDiagnosticLogginKey(double cpuUsage)
+{
+    if (cpuUsage &lt; 10)
+        return ASCIILiteral(&quot;Below10&quot;);
+    if (cpuUsage &lt; 20)
+        return ASCIILiteral(&quot;10to20&quot;);
+    if (cpuUsage &lt; 40)
+        return ASCIILiteral(&quot;20to40&quot;);
+    if (cpuUsage &lt; 60)
+        return ASCIILiteral(&quot;40to60&quot;);
+    if (cpuUsage &lt; 80)
+        return ASCIILiteral(&quot;60to80&quot;);
+    return ASCIILiteral(&quot;over80&quot;);
+}
+
+void Page::measurePostLoadCPUUsage()
+{
+    if (!m_postLoadCPUTime) {
+        m_postLoadCPUTime = getCPUTime();
+        if (m_postLoadCPUTime)
+            m_cpuUsageMeasurementTimer.startOneShot(cpuUsageMeasurementDuration);
+        return;
+    }
+    std::optional&lt;CPUTime&gt; cpuTime = getCPUTime();
+    if (!cpuTime)
+        return;
+
+    double cpuUsage = cpuTime.value().percentageCPUUsageSince(*m_postLoadCPUTime);
+    RELEASE_LOG_IF_ALLOWED(PerformanceLogging, &quot;measurePostLoadCPUUsage: Process was using %.1f%% percent CPU after the page load.&quot;, cpuUsage);
+    diagnosticLoggingClient().logDiagnosticMessageWithValue(DiagnosticLoggingKeys::postPageLoadKey(), DiagnosticLoggingKeys::cpuUsageKey(), cpuUsageToDiagnosticLogginKey(cpuUsage), ShouldSample::No);
+}
+
</ins><span class="cx"> void Page::setTopContentInset(float contentInset)
</span><span class="cx"> {
</span><span class="cx">     if (m_topContentInset == contentInset)
</span></span></pre></div>
<a id="branchessafari603branchSourceWebCorepagePageh"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/WebCore/page/Page.h (210877 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/page/Page.h        2017-01-18 20:43:34 UTC (rev 210877)
+++ branches/safari-603-branch/Source/WebCore/page/Page.h        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -21,6 +21,7 @@
</span><span class="cx"> #pragma once
</span><span class="cx"> 
</span><span class="cx"> #include &quot;ActivityState.h&quot;
</span><ins>+#include &quot;CPUTime.h&quot;
</ins><span class="cx"> #include &quot;FindOptions.h&quot;
</span><span class="cx"> #include &quot;FrameLoaderTypes.h&quot;
</span><span class="cx"> #include &quot;LayoutMilestones.h&quot;
</span><span class="lines">@@ -299,6 +300,9 @@
</span><span class="cx">     UserInterfaceLayoutDirection userInterfaceLayoutDirection() const { return m_userInterfaceLayoutDirection; }
</span><span class="cx">     WEBCORE_EXPORT void setUserInterfaceLayoutDirection(UserInterfaceLayoutDirection);
</span><span class="cx"> 
</span><ins>+    void didStartProvisionalLoad();
+    void didFinishLoad(); // Called when the load has been committed in the main frame.
+
</ins><span class="cx">     // The view scale factor is multiplied into the page scale factor by all
</span><span class="cx">     // callers of setPageScaleFactor.
</span><span class="cx">     WEBCORE_EXPORT void setViewScaleFactor(float);
</span><span class="lines">@@ -568,6 +572,8 @@
</span><span class="cx">     void checkSubframeCountConsistency() const;
</span><span class="cx"> #endif
</span><span class="cx"> 
</span><ins>+    void measurePostLoadCPUUsage();
+
</ins><span class="cx">     enum ShouldHighlightMatches { DoNotHighlightMatches, HighlightMatches };
</span><span class="cx">     enum ShouldMarkMatches { DoNotMarkMatches, MarkMatches };
</span><span class="cx"> 
</span><span class="lines">@@ -753,6 +759,9 @@
</span><span class="cx">     
</span><span class="cx">     // For testing.
</span><span class="cx">     std::optional&lt;EventThrottlingBehavior&gt; m_eventThrottlingBehaviorOverride;
</span><ins>+
+    Timer m_cpuUsageMeasurementTimer;
+    std::optional&lt;CPUTime&gt; m_postLoadCPUTime;
</ins><span class="cx"> };
</span><span class="cx"> 
</span><span class="cx"> inline PageGroup&amp; Page::group()
</span></span></pre></div>
<a id="branchessafari603branchSourceWebCorepageSettingscpp"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/WebCore/page/Settings.cpp (210877 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/page/Settings.cpp        2017-01-18 20:43:34 UTC (rev 210877)
+++ branches/safari-603-branch/Source/WebCore/page/Settings.cpp        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -778,6 +778,15 @@
</span><span class="cx"> #endif
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+bool Settings::isPostLoadCPUUsageMeasurementEnabled()
+{
+#if PLATFORM(COCOA)
+    return true;
+#else
+    return false;
+#endif
+}
+
</ins><span class="cx"> void Settings::setAllowsAnySSLCertificate(bool allowAnySSLCertificate)
</span><span class="cx"> {
</span><span class="cx">     gAllowsAnySSLCertificate = allowAnySSLCertificate;
</span></span></pre></div>
<a id="branchessafari603branchSourceWebCorepageSettingsh"></a>
<div class="modfile"><h4>Modified: branches/safari-603-branch/Source/WebCore/page/Settings.h (210877 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/page/Settings.h        2017-01-18 20:43:34 UTC (rev 210877)
+++ branches/safari-603-branch/Source/WebCore/page/Settings.h        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -199,6 +199,8 @@
</span><span class="cx">     static bool shouldUseHighResolutionTimers() { return gShouldUseHighResolutionTimers; }
</span><span class="cx"> #endif
</span><span class="cx"> 
</span><ins>+    static bool isPostLoadCPUUsageMeasurementEnabled();
+
</ins><span class="cx">     static bool globalConstRedeclarationShouldThrow();
</span><span class="cx"> 
</span><span class="cx">     WEBCORE_EXPORT void setBackgroundShouldExtendBeyondPage(bool);
</span></span></pre></div>
<a id="branchessafari603branchSourceWebCoreplatformCPUTimecpp"></a>
<div class="addfile"><h4>Added: branches/safari-603-branch/Source/WebCore/platform/CPUTime.cpp (0 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/platform/CPUTime.cpp                                (rev 0)
+++ branches/safari-603-branch/Source/WebCore/platform/CPUTime.cpp        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -0,0 +1,48 @@
</span><ins>+/*
+ * Copyright (C) 2017 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include &quot;config.h&quot;
+#include &quot;CPUTime.h&quot;
+
+namespace WebCore {
+
+#if !PLATFORM(COCOA)
+
+std::optional&lt;CPUTime&gt; getCPUTime()
+{
+    return std::nullopt;
+}
+
+#endif
+
+double CPUTime::percentageCPUUsageSince(const CPUTime&amp; reference)
+{
+    int64_t cpuUsageTimeDelta = (systemTime + userTime) - (reference.systemTime + reference.userTime);
+    int64_t cpuTimeDelta = cpuTime - reference.cpuTime;
+    ASSERT(cpuTimeDelta);
+    return static_cast&lt;double&gt;(cpuUsageTimeDelta * 100.0) / cpuTimeDelta;
+}
+
+}
</ins></span></pre></div>
<a id="branchessafari603branchSourceWebCoreplatformCPUTimeh"></a>
<div class="addfile"><h4>Added: branches/safari-603-branch/Source/WebCore/platform/CPUTime.h (0 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/platform/CPUTime.h                                (rev 0)
+++ branches/safari-603-branch/Source/WebCore/platform/CPUTime.h        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -0,0 +1,42 @@
</span><ins>+/*
+ * Copyright (C) 2017 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include &lt;wtf/Optional.h&gt;
+
+namespace WebCore {
+
+struct CPUTime {
+    int64_t cpuTime; // in microseconds.
+    int64_t userTime; // in microseconds.
+    int64_t systemTime; // in microseconds.
+
+    double percentageCPUUsageSince(const CPUTime&amp;);
+};
+
+std::optional&lt;CPUTime&gt; getCPUTime();
+
+} // namespace WebCore
</ins></span></pre></div>
<a id="branchessafari603branchSourceWebCoreplatformcocoaCPUTimeCocoamm"></a>
<div class="addfile"><h4>Added: branches/safari-603-branch/Source/WebCore/platform/cocoa/CPUTimeCocoa.mm (0 => 210878)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-603-branch/Source/WebCore/platform/cocoa/CPUTimeCocoa.mm                                (rev 0)
+++ branches/safari-603-branch/Source/WebCore/platform/cocoa/CPUTimeCocoa.mm        2017-01-18 20:43:40 UTC (rev 210878)
</span><span class="lines">@@ -0,0 +1,71 @@
</span><ins>+/*
+ * Copyright (C) 2017 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import &quot;config.h&quot;
+#import &quot;CPUTime.h&quot;
+
+#import &lt;mach/mach_init.h&gt;
+#import &lt;mach/task.h&gt;
+#import &lt;mach/task_info.h&gt;
+#import &lt;wtf/CurrentTime.h&gt;
+
+namespace WebCore {
+
+static const int64_t microsecondsPerSecond = 1000000;
+
+static int64_t timeValueToMicroseconds(const time_value_t&amp; value)
+{
+    int64_t result = value.seconds;
+    result *= microsecondsPerSecond;
+    result += value.microseconds;
+    return result;
+}
+
+std::optional&lt;CPUTime&gt; getCPUTime()
+{
+    // Account for current threads.
+    task_thread_times_info threadInfoData;
+    mach_msg_type_number_t threadInfoCount = TASK_THREAD_TIMES_INFO_COUNT;
+    kern_return_t result = task_info(mach_task_self(), TASK_THREAD_TIMES_INFO, reinterpret_cast&lt;task_info_t&gt;(&amp;threadInfoData), &amp;threadInfoCount);
+    if (result != KERN_SUCCESS)
+        return std::nullopt;
+
+    int64_t userTime = timeValueToMicroseconds(threadInfoData.user_time);
+    int64_t systemTime = timeValueToMicroseconds(threadInfoData.system_time);
+
+    // Account for termined threads.
+    task_basic_info taskInfoData;
+    mach_msg_type_number_t taskInfoCount = TASK_BASIC_INFO_COUNT;
+    result = task_info(mach_task_self(), TASK_BASIC_INFO, reinterpret_cast&lt;task_info_t&gt;(&amp;taskInfoData), &amp;taskInfoCount);
+    if (result != KERN_SUCCESS)
+        return std::nullopt;
+
+    userTime += timeValueToMicroseconds(taskInfoData.user_time);
+    systemTime += timeValueToMicroseconds(taskInfoData.system_time);
+
+    return CPUTime { static_cast&lt;int64_t&gt;(monotonicallyIncreasingTime() * microsecondsPerSecond), userTime, systemTime };
+}
+
+}
</ins></span></pre>
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