Re: [PATCH 0/8] livepatch: klp-convert tool

[Miroslav Benes]

> > For -fpatchable-function-entries I switched
> > off IPA-RA, as especially on RISC there's _nothing_ you can do between
> > functions without at least one scratch reg. But for live patching, I'd like
> > the kernel to be compiled in the first place with 100% ABI adherence, IOW
> > all IPA optimisations turned off. Does anyone have numbers on the performance
> > impact?
> 
> I agree that would be the best option.
> 
> I don't think anyone has measured it because we don't know how to get
> the compiler to do that :-)  My guess is that it will be something close
> to negligible.

I asked Nicolai to do some performance testing with all the options that 
could be disabled disabled.

Miroslav