Re: [patch v5 14/15] sched: power aware load balance

[Alex Shi]

On 03/21/2013 06:27 PM, Preeti U Murthy wrote:
>> > did you close all of background system services?
>> > In theory the rq->avg.runnable_avg_sum should be zero if there is no
>> > task a bit long, otherwise there are some bugs in kernel.
> Could you explain why rq->avg.runnable_avg_sum should be zero? What if
> some kernel thread ran on this run queue and is now finished? Its
> utilisation would be say x.How would that ever drop to 0,even if nothing
> ran on it later?

the value get from decay_load():
 sa->runnable_avg_sum = decay_load(sa->runnable_avg_sum,
in decay_load it is possible to be set zero.

and /proc/sched_debug also approve this:

  .tg_runnable_contrib           : 0
  .tg->runnable_avg              : 50
  .avg->runnable_avg_sum         : 0
  .avg->runnable_avg_period      : 47507


-- 
Thanks Alex
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/