[Webkit-unassigned] [Bug 186729] New: StructureCache wastes 240KB of HashTable capacity on cnn.com
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Sat Jun 16 12:24:55 PDT 2018
https://bugs.webkit.org/show_bug.cgi?id=186729
Bug ID: 186729
Summary: StructureCache wastes 240KB of HashTable capacity on
cnn.com
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
Assignee: webkit-unassigned at lists.webkit.org
Reporter: simon.fraser at apple.com
Using tooling from bug 186698, loading can and running "notifyutil -p com.apple.WebKit.dumpHashTableCapacity" shows:
Wasted capacity: 244368 bytes (used 148848 of 393216 bytes, utilization: 37.85%) - 1 allocations
1 0x1166cc265 WTF::HashTable<JSC::PrototypeKey, WTF::KeyValuePair<JSC::PrototypeKey, JSC::Weak<JSC::Structure> >, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<JSC::PrototypeKey, JSC::Weak<JSC::Structure> > >, JSC::PrototypeKeyHash, WTF::HashMap<JSC::PrototypeKey, JSC::Weak<JSC::Structure>, JSC::PrototypeKeyHash, WTF::HashTraits<JSC::PrototypeKey>, WTF::HashTraits<JSC::Weak<JSC::Structure> > >::KeyValuePairTraits, WTF::HashTraits<JSC::PrototypeKey> >::HashTable()
2 0x1166cc245 WTF::HashMap<JSC::PrototypeKey, JSC::Weak<JSC::Structure>, JSC::PrototypeKeyHash, WTF::HashTraits<JSC::PrototypeKey>, WTF::HashTraits<JSC::Weak<JSC::Structure> > >::HashMap()
3 0x1166cc1a5 WTF::HashMap<JSC::PrototypeKey, JSC::Weak<JSC::Structure>, JSC::PrototypeKeyHash, WTF::HashTraits<JSC::PrototypeKey>, WTF::HashTraits<JSC::Weak<JSC::Structure> > >::HashMap()
4 0x1166cc15b JSC::WeakGCMap<JSC::PrototypeKey, JSC::Structure, JSC::PrototypeKeyHash, WTF::HashTraits<JSC::PrototypeKey> >::WeakGCMap(JSC::VM&)
5 0x1166cc10d JSC::WeakGCMap<JSC::PrototypeKey, JSC::Structure, JSC::PrototypeKeyHash, WTF::HashTraits<JSC::PrototypeKey> >::WeakGCMap(JSC::VM&)
6 0x1166cc0dd JSC::StructureCache::StructureCache(JSC::VM&)
7 0x1166bffed JSC::StructureCache::StructureCache(JSC::VM&)
8 0x1166bc42f JSC::VM::VM(JSC::VM::VMType, JSC::HeapType)
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