[Webkit-unassigned] [Bug 186742] New: TreeScopeOrderedMap wastes 132KB of HashTable capacity on nytimes.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186742

            Bug ID: 186742
           Summary: TreeScopeOrderedMap wastes 132KB of HashTable capacity
                    on nytimes.com
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Using tooling from bug 186698, loading nytimes.com and running "notifyutil -p com.apple.WebKit.dumpHashTableCapacity" shows:

Wasted capacity: 131912 bytes (used 65208 of 197120 bytes, utilization: 33.08%) - 80 allocations
1   0x1078997a5 WTF::HashTable<WTF::AtomicStringImpl const*, WTF::KeyValuePair<WTF::AtomicStringImpl const*, WebCore::TreeScopeOrderedMap::MapEntry>, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WTF::AtomicStringImpl const*, WebCore::TreeScopeOrderedMap::MapEntry> >, WTF::PtrHash<WTF::AtomicStringImpl const*>, WTF::HashMap<WTF::AtomicStringImpl const*, WebCore::TreeScopeOrderedMap::MapEntry, WTF::PtrHash<WTF::AtomicStringImpl const*>, WTF::HashTraits<WTF::AtomicStringImpl const*>, WTF::HashTraits<WebCore::TreeScopeOrderedMap::MapEntry> >::KeyValuePairTraits, WTF::HashTraits<WTF::AtomicStringImpl const*> >::HashTable()
2   0x107899785 WTF::HashMap<WTF::AtomicStringImpl const*, WebCore::TreeScopeOrderedMap::MapEntry, WTF::PtrHash<WTF::AtomicStringImpl const*>, WTF::HashTraits<WTF::AtomicStringImpl const*>, WTF::HashTraits<WebCore::TreeScopeOrderedMap::MapEntry> >::HashMap()
3   0x107899765 WTF::HashMap<WTF::AtomicStringImpl const*, WebCore::TreeScopeOrderedMap::MapEntry, WTF::PtrHash<WTF::AtomicStringImpl const*>, WTF::HashTraits<WTF::AtomicStringImpl const*>, WTF::HashTraits<WebCore::TreeScopeOrderedMap::MapEntry> >::HashMap()
4   0x107899745 WebCore::TreeScopeOrderedMap::TreeScopeOrderedMap()
5   0x107899725 WebCore::TreeScopeOrderedMap::TreeScopeOrderedMap()
6   0x10788e206 WebCore::TreeScope::addElementById(WTF::AtomicStringImpl const&, WebCore::Element&, bool)
7   0x1077630f8 WebCore::Element::updateIdForTreeScope(WebCore::TreeScope&, WTF::AtomicString const&, WTF::AtomicString const&, WebCore::Element::NotifyObservers)
8   0x107762cd2 WebCore::Element::insertedIntoAncestor(WebCore::Node::InsertionType, WebCore::ContainerNode&)

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