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