Implement improved ftrace infrastructure for PPC64LE (goal 1), s390x (goal 2), ARM64 (goal 3) that is able to support kGraft and doesn't have a performance impact. PPC64LE has an experimental (untested) patch by Dinar Valeev already, s390x works, but has a 10% performance impact on the system, ARM64 is entirely untouched.
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