Re: Too many PMC implementations

[Maxime Villard <max%m00nbsd.net@localhost>]

Le 10/08/2018 à 11:40, Maxime Villard a écrit :
> I saw the thread [Re: Sample based profiling] on tech-userlevel@, I'm not
> subscribed to this list but I'm answering here because it's related to
> tprof among other things.
>
> I agree that it would be better to retire gprof in base, because there are
> more powerful tools now, and also advanced hardware support (PMC, PEBS,
> ProcessorTrace).
>
> But in particular, it would be nice to retire the "kernel gprof". That is,
> the MD/MI pieces that are surrounded by #ifdef GPROF. This kind of
> profiling is weak, and misses many aspects of execution (branch prediction,
> cache misses, heavy instructions, etc) that are offered by tprof.
>
> I already dropped NENTRY() from x86, so KGPROF is officially not supported
> there anymore. I think it has never worked on amd64.

So no one has any opinion on that? Because in this case I will remove it
soon. (Talking about the kernel gprof.)