Re: [RFC v2 0/6] x86: dynamic indirect branch promotion

[Andi Kleen]

> BTW: I am not sure that static-keys are much better. Their change also
> affects the control flow, and they do affect the control flow.

Static keys have the same problem, but they only change infrequently so usually
it's not too big a problem if you dump the kernel close to the tracing 
sessions.

simple-pt doesn't have a similar mechanism, so it suffers more from it.

-Andi