Subject: Re: [PATCH] powerpc/mm: Add trace point for tracking hash pte fault

From: Anton Blanchard <[email-masked]>
Date: Mon, 2 Feb 2015 21:26:07 +1100

Hi,

> > ebizzy with -S 30 -t 1 -P gave
> > 13627 records/s -> Without patch
> > 13546 records/s -> With patch with tracepoint disabled
> 
> OK. So that's about -0.6%. Are we happy with that? I'm not sure.
> 
> Can you do a few more runs and see if that's a stable result.

Surprisingly large. Is CONFIG_JUMP_LABEL enabled? That should reduce the
tracepoint to just a nop.

Anton