john stultz wrote:

On Fri, 2009-06-12 at 00:03 -0700, Richard Henderson wrote:
  

quoted

john stultz wrote:
    

quoted

I suspect the alpha arch could even be further improved to provide and
rpcc() based clocksource, but not having the hardware, I don't feel
comfortable attempting the more complicated conversion (but I'd be glad
to help if anyone else is interested).
      

Unfortunately this isn't possible.  The rpcc value is only 32-bits wide,
and so rolls over in approx 3 to 4 seconds.  Thus all the contortions to
try and use the truncated value for sub 1 second adjustments.
    

That's actually ok. The ACPI PM clocksource on x86 is only 24 bits wide
and wraps every 5 seconds. The generic timekeeping code handles the
wrapping and accumulation for you.
  

Interesting.

Might you create a patch that does this conversion and apply it on top
of mine? 

Unfortunately I don't have working hardware anymore.  Perhaps Ivan will 
be able to help here.


r~