[Webkit-unassigned] [Bug 142593] New: Many users of Heap::reportExtraMemory* are wrong, causing lots of memory growth

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=142593

            Bug ID: 142593
           Summary: Many users of Heap::reportExtraMemory* are wrong,
                    causing lots of memory growth
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ggaren at apple.com

These users are wrong:

JSReportExtraMemoryCost
SparseArrayValueMap
JSDocument
JSImageData
JSNodeList
collectionindex
canvas
imageloader
mediaelement
sourcebuffer
xmlhttprequest

They only report cost upon allocation, not upon visit. This can cause lots of memory growth, since it makes the heap thing that eden collection is constantly succeeding in reclaiming huge amounts of memory.

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