[Webkit-unassigned] [Bug 204286] New: [bmalloc] Some chunk has unused page in the tail of its memory block.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204286

            Bug ID: 204286
           Summary: [bmalloc] Some chunk has unused page in the tail of
                    its memory block.
           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

Depending on its pageSize, chunk block has an unused memory block at the tail of its allocated block. All chunks are allocated in chunkSize and initialized by pageSize (pageClass). At this moment, some pageSize doesn't use some amount of memory at the end. For instance, pageClass 5 has 16k unused memory and pageClass 12 has 36k of it. These areas are kept committed but unused until it's pushed to largeFree.

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