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 > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
