I use "ktrace -t f" once in a while for debugging and it's really handy. Output looks like

78436 cat PFLT 0x6c71f99cda8 0x2<VM_PROT_WRITE> 78436 cat PRET KERN_SUCCESS 78436 cat PFLT 0x3c6efd36c280 0x2<VM_PROT_WRITE> 78436 cat PRET KERN_SUCCESS 78436 cat PFLT 0x3c6efd36e158 0x2<VM_PROT_WRITE> 78436 cat PRET KERN_SUCCESS ...

Obviously not nearly as flexible as ebpf though. For instance it'll log all page faults happening in the context of the process, and so includes page faults that happen in the kernel due to copyin()/copyout() etc. Sometimes it's helpful and other times confusing.