Re: [patch v4 11/18] sched: log the cpu utilization at rq
From: Peter Zijlstra
Date: Tue Feb 12 2013 - 05:39:59 EST
On Thu, 2013-01-24 at 11:06 +0800, Alex Shi wrote:
> The cpu's utilization is to measure how busy is the cpu.
> util = cpu_rq(cpu)->avg.runnable_avg_sum
> / cpu_rq(cpu)->avg.runnable_avg_period;
> Since the util is no more than 1, we use its percentage value in later
> caculations. And set the the FULL_UTIL as 100%.
> In later power aware scheduling, we are sensitive for how busy of the
> cpu, not how much weight of its load. As to power consuming, it is more
> related with cpu busy time, not the load weight.
I think we can make that argument in general; that is irrespective of
the actual policy. We simply never had anything better to go with.
So please clarify why you think this only applies to power aware
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