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trace: Add %K and %U format specifiers (iovisor#742)
The %K and %U format specifiers can be used in a trace format string to resolve kernel and user symbols, respectively. For example, the pthread_create USDT probe has an argument pointing to the new thread's function. To trace pthread_create and print the symbolic name of the new thread's function, use: ``` trace 'u:pthread:pthread_create "%U", arg3' ``` The %U specifier resolves addresses in the event's process, while the %K specifier resolves kernel addresses.
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