On 13 June 2012 14:47, Peter Zijlstra peterz@infradead.org wrote:
On Wed, 2012-06-13 at 18:14 +0530, Amit Kucheria wrote:
Various discussions around power-aware scheduling have amplified the need for the scheduler to have some knowledge of DVFS. This would then require the scheduler to track 'cpu_power' ( = max power) and perhaps a new variable 'current_power' that is changed by the DVFS framework.
Note that capacity is in fact a better term -- not to be confused with the capacity as currently in use within the load-balancer. Luckily there's no way to read that an not be confused.. uhmm :-)
The first goal, though, is to make sure that the scheduler can handle different cpu_power values due to asymmetric cores.
I would think the very first goal was to do a simple packing balancer before doing silly things with asymmetric setups.. but what do I know.
In fact, there is 2 tracks, one for a power aware scheduler and one for setting the capacity of each core of a big.LITTLE system. This patch is for the latter and is not directly link to the power because the default/performance mode of the scheduler should also take advantage of this information