Messages in this thread | | | Subject | Re: [RFC PATCH 00/10] x86: undwarf unwinder | From | Jiri Slaby <> | Date | Thu, 1 Jun 2017 16:08:25 +0200 |
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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
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