"Gautham R. Shenoy" <e...@linux.vnet.ibm.com> writes: > From: "Gautham R. Shenoy" <e...@linux.vnet.ibm.com> > > On PSeries LPARs, the data centers planners desire a more accurate > view of system utilization per resource such as CPU to plan the system > capacity requirements better. Such accuracy can be obtained by reading > PURR/SPURR registers for CPU resource utilization. > > Tools such as lparstat which are used to compute the utilization need > to know [S]PURR ticks when the cpu was busy or idle. The [S]PURR > counters are already exposed through sysfs. We already account for > PURR ticks when we go to idle so that we can update the VPA area. This > patchset extends support to account for SPURR ticks when idle, and > expose both via per-cpu sysfs files.
Does anything really want to use PURR instead of SPURR? Seems like we should expose only SPURR idle values if possible.
