[Webkit-unassigned] [Bug 90255] New: JSObject wastes too much memory on unused property slots

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90255

           Summary: JSObject wastes too much memory on unused property
                    slots
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


1) Non-final objects should not have inline property storage, since it is used rarely and allocating out-of-line storage is cheap.

2) The initial size of out-of-line storage should not be a whopping 16 slots, or 128 bytes.  It should be some sensible amount, like maybe 4 (32 bytes), or 2x the inline storage, whichever is bigger.

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