Hi Peter,
On 03/26/2013 06:07 PM, Peter Zijlstra wrote:
On Fri, 2013-03-22 at 13:25 +0100, Vincent Guittot wrote:
+static bool is_light_task(struct task_struct *p) +{
/* A light task runs less than 20% in average */return ((p->se.avg.runnable_avg_sum * 5) <(p->se.avg.runnable_avg_period));+}
OK, so we have a 'problem' here, we initialize runnable_avg_* to 0, but we want to 'assume' a fresh task is fully 'loaded'. IIRC Alex ran into this as well.
PJT, do you have any sane solution for this, I forgot what the result of the last discussion was -- was there any?
The conclusion after last discussion between PJT and Alex was that the load contribution of a fresh task be set to "full" during "__sched_fork()".
task->se.avg.load_avg_contrib = task->se.load.weight during __sched_fork() is reflected in the latest power aware scheduler patchset by Alex.
Thanks
Regards Preeti U Murthy