On Wed, 2011-01-26 at 17:46 +0100, Peter Zijlstra wrote: > On Wed, 2011-01-26 at 13:43 -0200, Glauber Costa wrote: > > > yes, but once this delta is subtracted from rq->clock_task, this value is not > > used to dictate power, unless I am mistaken. > > > > power is adjusted according to scale_rt_power(), which does it using the > > values of rq->rt_avg, rq->age_stamp, and rq->clock. > > > > So whatever I store into rq->clock_task, but not rq->clock (which > > correct me if I'm wrong, is expected to be walltime), will not be used > > to adjust cpu power, which is what I'm trying to achieve. > > No, see the below, it uses a per-cpu virt_steal_time() clock which is > expected to return steal-time in ns. > > All time not accounted to ->clock_task is accumulated in lost, and > passed into sched_rt_avg_update() and thus affects the cpu_power. > > If it finds that 50% of the (recent) time is steal time, its cpu_power > will be 50%. ok, now I get your proposal. It does make sense. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
