On Thu, 2015-01-22 at 12:05 +0800, Wanpeng Li wrote:
> On Tue, Jan 20, 2015 at 07:18:37AM +0800, Wanpeng Li wrote:
> >>> if (!rq->rd->overload)
> >>> rq->rd->overload = true;
> >>
> >>Here 3882ec643997 ("nohz: Use IPI implicit full barrier against
> >>rq->nr_running r/w"
On Tue, Jan 20, 2015 at 07:18:37AM +0800, Wanpeng Li wrote:
>>> if (!rq->rd->overload)
>>> rq->rd->overload = true;
>>
>>Here 3882ec643997 ("nohz: Use IPI implicit full barrier against
>>rq->nr_running r/w") might be a clue.
>>
>>Also, this is wrong, it breaks NOHZ_F
On Mon, Jan 19, 2015 at 01:45:28PM +0100, Peter Zijlstra wrote:
>On Wed, Nov 26, 2014 at 08:44:05AM +0800, Wanpeng Li wrote:
>> The overload indicator is used for knowing when we can totally avoid load
>> balancing to a cpu that is about to go idle. We can avoid load balancing
>> when no cpu has cf
On Mon, Jan 19, 2015 at 09:48:45AM -0800, Tim Chen wrote:
>On Mon, 2015-01-19 at 13:45 +0100, Peter Zijlstra wrote:
>> On Wed, Nov 26, 2014 at 08:44:05AM +0800, Wanpeng Li wrote:
>> > The overload indicator is used for knowing when we can totally avoid load
>> > balancing to a cpu that is about to
On Mon, 2015-01-19 at 13:45 +0100, Peter Zijlstra wrote:
> On Wed, Nov 26, 2014 at 08:44:05AM +0800, Wanpeng Li wrote:
> > The overload indicator is used for knowing when we can totally avoid load
> > balancing to a cpu that is about to go idle. We can avoid load balancing
> > when no cpu has cfs t
On Wed, Nov 26, 2014 at 08:44:05AM +0800, Wanpeng Li wrote:
> The overload indicator is used for knowing when we can totally avoid load
> balancing to a cpu that is about to go idle. We can avoid load balancing
> when no cpu has cfs task and both rt and deadline have push/pull mechanism
> to do the
The overload indicator is used for knowing when we can totally avoid load
balancing to a cpu that is about to go idle. We can avoid load balancing
when no cpu has cfs task and both rt and deadline have push/pull mechanism
to do their own balancing.
However, rq->nr_running on behalf of the total nu
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