In message <[email protected]> you wrote:
> Andrew Morton wrote:
> >>
> >> unsigned int rt_priority;
> >> - cputime_t utime, stime;
> >> + cputime_t utime, stime, utimescaled, stimescaled;
> >
> > Adding 8 or 16 bytes to the task_struct for all architectures for something
> > which only powerpc uses?
> >
> > Is there any prospect that other CPUs can use this?
> >
>
> Hi, Andrew,
>
> There is definitely the prospect for other architectures to use this
> feature
>
> x86 provides the APERF and MPERF model specific registers.
> The ratio of APERF to MPERF gives the current scaled load on the
> system (acpi-cpufreq, get_measured_perf()) I have been looking at
> exploiting this functionality for x-series, but ran into a problem;
> as per the specification, APERF and MPERF are to be reset to 0
> upon reading them. As a result, I am still figuring out a good
> way to share the data amongst the ondemand governor and utimescaled
> statistics.
>
> I think for now, we can
>
> 1. Put utimescaled and stimescaled under an #ifdef for ARCH_POWERPC
... or even #ifdef TASKSTATS
> 2. Add utimescaled and stimescaled and add a big fat comment stating
> that work for other architectures is on it's way.
>
> In either case, I think the functionality is useful and can be
> exploited by other architectures. The powerpc port is complete and
> I think the implementation would provide a good reference for
> other implementations to follow.
>
> --
> Warm Regards,
> Balbir Singh
> Linux Technology Center
> IBM, ISTL
>
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