[Webkit-unassigned] [Bug 226237] New: [bmalloc] Make adaptive scavenging more precise

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226237

            Bug ID: 226237
           Summary: [bmalloc] Make adaptive scavenging more precise
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: msaboff at apple.com

The adaptive scavenger introduced many more madvise() calls.  Some of those calls are expensive since the scavenger uses a conservative approach to madvise()'ing.

Instead, we should minimize the range of the address space we madvise().  We can do this by keeping track of the allocated extent of large regions.

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