cvs commit: src/sys/arm/conf NSLU

[Robert Watson]

On Mon, 8 Sep 2008, Warner Losh wrote:

>  Commit the no-brainer parts of my space saving kernel experiments.  We
>  don't inline the locking primitives, and only grab those parts of mii
>  that we really need.  Other space optimizations are too agressive for
>  the generic file (removing all of usb, and loading it as kernel
>  modules).

It's been a few years since we selected defaults on lock inlining (and other 
optional parameters), and it might well be time to re-evaluate our defaults. 
Cache footprint on code continues to play a significant role in performance, 
the trade-offs for function invocation have changed quite a bit over the 
years.  A more thorough performance analysis of lock inlining is probably 
overdue for all platforms, not just small embedded ones.

Robert N M Watson
Computer Laboratory
University of Cambridge