Capturing User-Level Function Calls/Returns

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What is the most efficient way to capture occurrence of a function call/return of a binary program in userspace?
It seems the answer is Uprobes. 1) Am I right?
But Uprobes use "int" instruction which leads to a switch into kernel mode. 2) Wouldn't it be better to avoid this transition? I'm looking forward to your reply and will be happy to read your opinions.

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