On Tue, Oct 27, 2015 at 01:57:28PM +0100, Peter Zijlstra wrote:
>
> (Excessive quoting for Olav)
>
> On Mon, Oct 26, 2015 at 06:44:48PM -0700, Joonwoo Park wrote:
> > On 10/25/2015 03:26 AM, Peter Zijlstra wrote:
>
> > > Also note that on both sites we also set TASK_ON_RQ_MIGRATING -- albeit
> >
(Excessive quoting for Olav)
On Mon, Oct 26, 2015 at 06:44:48PM -0700, Joonwoo Park wrote:
> On 10/25/2015 03:26 AM, Peter Zijlstra wrote:
> > Also note that on both sites we also set TASK_ON_RQ_MIGRATING -- albeit
> > late. Can't you simply set that earlier (and back to QUEUED later) and
> > te
On 10/25/2015 03:26 AM, Peter Zijlstra wrote:
> On Sat, Oct 24, 2015 at 10:23:14PM -0700, Joonwoo Park wrote:
>> @@ -1069,7 +1069,7 @@ static struct rq *move_queued_task(struct rq *rq,
>> struct task_struct *p, int new
>> {
>> lockdep_assert_held(&rq->lock);
>>
>> -dequeue_task(rq, p,
On Sat, Oct 24, 2015 at 10:23:14PM -0700, Joonwoo Park wrote:
> @@ -1069,7 +1069,7 @@ static struct rq *move_queued_task(struct rq *rq,
> struct task_struct *p, int new
> {
> lockdep_assert_held(&rq->lock);
>
> - dequeue_task(rq, p, 0);
> + dequeue_task(rq, p, DEQUEUE_MIGRATING);
On Sat, Oct 24, 2015 at 10:23:14PM -0700, Joonwoo Park wrote:
> At present scheduler resets task's wait start timestamp when the task
> migrates to another rq. This misleads scheduler itself into reporting
> less wait time than actual by omitting time spent for waiting prior to
> migration and als
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