Re: per-cpu statistics (Re: CVS commit: src)

[Matt Thomas <matt%3am-software.com@localhost>]

On Apr 11, 2008, at 10:47 AM, Jason Thorpe wrote:
> On Apr 10, 2008, at 10:36 PM, Simon Burge wrote:
>
> > I'm happy with keeping the API too.  Is the longer term plan to make
> > _all_ evcnts (kstats/counters/whatever) per-CPU?  At collate at user
> > access time?
>
> I think there will be two classes, at least:
>
> - Strictly per-CPU (no collating ... for stuff like "cpu0 intr  
> count", etc.)
>
> - Global with per-CPU updates, collated at user access time
>
> And *MAYBE*:
>
> - Global with interlocked updates.

think about device intr counts which will be protected by a spin mutex.
those won't need per-cpu instances.