Re: [RFC PATCH 00/10] x86: undwarf unwinder

[Jiri Slaby]

Ccing Mel who did proper measurements and can hopefully comment on his
results.

On 06/01/2017, 03:50 PM, Ingo Molnar wrote:
> That's not what I meant! The speedup comes from (hopefully) being able to disable 
> CONFIG_FRAME_POINTER, which:
> 
>  - creates simpler/faster function prologues and epilogues - no managing of RBP 
>    needed
> 
>  - gives one more generic purpose register to work from. This matters less on 
>    64-bit kernels but it's a small effect.
> 
> I've seen numbers of 1-2% of instruction count reduction in common kernel 
> workloads, which would be pretty significant on well cached workloads.

thanks,
-- 
js
suse labs