On Tue, Sep 23, 2014 at 06:08:04PM +0200, Vincent Guittot wrote:
This implementation of utilization_avg_contrib doesn't solve the scaling in-variance problem, so i have to scale the utilization with original capacity of the CPU in order to get the CPU usage and compare it with the capacity. Once the scaling invariance will have been added in utilization_avg_contrib, we will remove the scale of utilization_avg_contrib by cpu_capacity_orig in get_cpu_usage. But the scaling invariance will come in another patchset.
I would have expected this in the previous patch that introduced that lot. Including a few words on how/why the cpu_capacity is a 'good' approximation etc..
Finally, the sched_group->sched_group_capacity->capacity_orig has been removed because it's more used during load balance.
That sentence is a contradiction, I expect there's a negative gone missing someplace.