[Webkit-unassigned] [Bug 205834] New: [bmalloc] Extract metadata from Heap and share it among Heaps.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205834

            Bug ID: 205834
           Summary: [bmalloc] Extract metadata from Heap and share it
                    among Heaps.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: bmalloc
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Basuke.Suzuki at sony.com
                CC: ggaren at apple.com

The following member variables of Heap are dependent only for vmPageSize and calculating same value for each Heap.
  m_vmPageSizePhysical, m_smallLineMetadata and m_pageClasses

Extract them as a separate class and access them from each Heap reduces sizeof(Heap) for m_pageClasses and Vector for m_smallLineMetadata.

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