Re: CVS commit: src/sys

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Thu, Jun 15, 2017 at 11:14:27AM +0200, Maxime Villard wrote:
> > I can't see how this improves the security.
> > AFAIK on linux PMCs can be used without root.
> > 
> 
> We don't do application tracking, contrary to linux. That is, we don't
> save/restore the counters on context switch. So the average user will have
> only little interest in PMCs.
> 
> Verily the current implementation is mainly useful to measure the kernel
> itself; when you make a change, and want to see whether the hit/miss ratios
> are improved.
> 
> So yes, our implementation is not very useful. Also, we support only few
> CPUs. But as I said it's still better than nothing, and so far I appear to
> have been the only one that has shown (some) interest in developing this.

OK, so once we have proper userland support we can revisit the access rights

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--