Re: [PATCH 2.6.13-rc6-rt9] PI aware dynamic priority adjustment

[Roland McGrath]

> On another issue along this line, I have been thinking of changing the 
> x86 TSC arch cycle size to 1ns.  (NOT the resolution, the units for the 
> arch cycle.)  The reason to do this is to correctly track changes in cpu 
> frequency as it is today, we would need to track down and update all 
> pending HR timers when ever the frequency changed.  By using a common 
> unit all we need to do is change the conversion constants (well I guess 
> they would not be constants any more :).  I REALLY don't want to do this 
> as it does add conversion overhead, but I can not think of another clean 
> way to track TSC frequency changes.

sched_clock does this conversion at sampling time, too.
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