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Hah, I've been looking into something amusingly similar to track mmap syscalls for a process :)

Why not just use ptrace?

ptrace is atleast 2 context switches that will make it pretty slow

Yeah this wasn't something like "I want to debug a program" but rather I wanted to be able to track mmaping for later cleanup.

Fortunately libc doesn't mmap that much internally so I think I can get away alright with interposing lib's mmap call.