Re: [PATCH v3 09/12] Revert "sched: Put rq's sched_avg under CONFIG_FAIR_GROUP_SCHED"

From: Dietmar Eggemann
Date: Mon Jul 14 2014 - 13:54:21 EST


>> In that same discussion ISTR a suggestion about adding avg_running time,
>> as opposed to the current avg_runnable. The sum of avg_running should be
>> much more accurate, and still react correctly to migrations.
> I haven't look in details but I agree that avg_running would be much
> more accurate than avg_runnable and should probably fit the
> requirement. Does it means that we could re-add the avg_running (or
> something similar) that has disappeared during the review of load avg
> tracking patchset ?

Are you referring to '[RFC PATCH 14/14] sched: implement usage tracking' from Paul Turner?

__update_entity_runnable_avg() has an additional parameter 'running' so
that it can be called for

a) sched_entities in update_entity_load_avg():

__update_entity_runnable_avg(..., se->on_rq, cfs_rq->curr == se))

b) rq's in update_rq_runnable_avg():

__update_entity_runnable_avg(..., runnable, runnable);

I can see how it gives us two different signals for a sched_entity but
for a rq?

Do I miss something here?

-- Dietmar


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