[Webkit-unassigned] [Bug 204822] New: Add network loading signposts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204822

            Bug ID: 204822
           Summary: Add network loading signposts
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nham at apple.com

We should be able to optionally log network data task-related signposts to the os_signpost subsystem on the Mac. This allows us to visualize the network load waterfall in our various perf visualization tools. I've found this to be helpful in debugging networking-related perf issues (e.g. making sure that speculative revalidation/loading isn't double-loading resources, making sure that concurrent requests go out with the expected priority, etc.).

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