[Webkit-unassigned] [Bug 196121] New: [BMalloc] No need to delay deallocating chunks based on recent use

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196121

            Bug ID: 196121
           Summary: [BMalloc] No need to delay deallocating chunks based
                    on recent use
           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: msaboff at apple.com
                CC: ggaren at apple.com

This is a follow-up for r243144 <https://trac.webkit.org/changeset/243144>.  The code checked in with that change set employed the used since last scavenge logic on small chunks, but that isn't needed for small chunks as their memory isn't decommitted directly.  Instead we "deallocate" small chunks by adding them to a large range free list.  When this large range free list is scavenged, we'll actually decommit the backing memory.  This reduces the number of scavenger passes needed to decommit small chunks from 4 to 3.

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