Re: [5/11] issue 5: Frequency and uarch invariant task load

2014-01-16 Thread Morten Rasmussen
On Wed, Jan 08, 2014 at 12:31:18PM +, Peter Zijlstra wrote: > On Tue, Jan 07, 2014 at 04:19:41PM +, Morten Rasmussen wrote: > > Potential solution: Frequency invariance has been proposed before [1] > > where the task load is scaled by the cur/max freq ratio. Another > > possibility is to us

Re: [5/11] issue 5: Frequency and uarch invariant task load

2014-01-08 Thread Peter Zijlstra
On Tue, Jan 07, 2014 at 04:19:41PM +, Morten Rasmussen wrote: > Potential solution: Frequency invariance has been proposed before [1] > where the task load is scaled by the cur/max freq ratio. Another > possibility is to use hardware counters if such are available on the > platform. > > [1] ht

[5/11] issue 5: Frequency and uarch invariant task load

2014-01-07 Thread Morten Rasmussen
Related to the issue of potential cpu capacity, task load is influenced directly by the current P-state of the cpu it is running on. For energy-aware task placement decisions the scheduler would need to estimate the energy impact of scheduling a specific task on a specific cpu. Depending on the res