[Webkit-unassigned] [Bug 219589] New: failed to use os_signpost with Instruments to collect some trace in webkit

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219589

            Bug ID: 219589
           Summary: failed to use os_signpost with Instruments to collect
                    some trace in webkit
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Template Framework
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zhousstest at gmail.com

Hi, I try to collect some trace to understand some behaviors in webkit. I see that Xcode provides some os logging methods, and one is call "os_signpost". So I insert those trace functions in source codes and try to use Instruments to collect some trace. No error goes out but I cannot capture any reserved critical events displayed in Instruments.

Is os_signpost supported in webkit? If not, what other tools could we use to capture some start and end times of interested events?

Thanks

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