It seems to me that the patch you pointed here doesn't include the latency
instrumentation.
Where it is the needed instrumentation to meassure it?
In http://www.zip.com.au/~akpm/linux/ the are no timepeg/intlat patches for
2.5...
>
> Several patches here which fix pretty much the last source of long
> scheduling latency stalls in the core kernel - long-held page_table_lock
> during pagetable teardown.
>
> The preemptible kernel now achieves around 500 microsecond worst-case
> latency on a 500MHz PIII (with a slow memory system). This is about as
[...]
Ulisses
Debian GNU/Linux: a dream come true
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