linux-kernel - Re: [PATCH] sched: Do not try to replenish from a non deadline tasks

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Date:	Fri, 10 Oct 2014 10:17:28 +0200
From:	Daniel Wagner <wagi@...om.org>
To:	Juri Lelli <juri.lelli@....com>,
	Daniel Wagner <daniel.wagner@...-carit.de>,
	"juri.lelli@...il.com" <juri.lelli@...il.com>
CC:	"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] sched: Do not try to replenish from a non deadline tasks

Good Morning Juri,

On 10/09/2014 03:51 PM, Juri Lelli wrote:
> Hi Daniel,
> 
> On 09/10/14 10:47, Daniel Wagner wrote:
>> Hi Juri,
>>
>> On 10/07/2014 03:20 PM, Daniel Wagner wrote:
>>> On 10/07/2014 02:10 PM, Daniel Wagner wrote:
>>>> [   36.689416] pthread_-1555    0d..5 18486408us : sched_stat_sleep: comm=pthread_test pid=1554 delay=143975 [ns]
>>>> [   36.689416] pthread_-1555    0d..5 18486408us : sched_wakeup: comm=pthread_test pid=1554 prio=120 success=1 target_cpu=000
>>>> [   36.689416] pthread_-1555    0d..4 18486420us : sched_pi_setprio: comm=pthread_test pid=1555 oldprio=-1 newprio=-1
>>>> [   36.689416] pthread_-1555    0d..4 18486421us : sched_dequeue_dl_entity: comm=pthread_test pid=1555 flags=0
>>>> [   36.689416] pthread_-1555    0d..4 18486421us : sched_enqueue_dl_entity: comm=pthread_test pid=1555 pi_comm=pthread_test pi_pid=1555 flags=8
>>>> [   36.689416] pthread_-1555    0d..4 18486421us : sched_dequeue_dl_entity: comm=pthread_test pid=1555 flags=0
>>>> [   36.689416] pthread_-1555    0d..4 18486422us : sched_enqueue_dl_entity: comm=pthread_test pid=1555 pi_comm=pthread_test pi_pid=1555 flags=0
>>>> [   36.689416] pthread_-1555    0d.H4 18486539us : sched_enqueue_dl_entity: comm=pthread_test pid=1555 pi_comm=pthread_test pi_pid=1555 flags=8
>>>
>>> I noticed that the last two lines are different. Maybe that is yet
>>> another path into enqueue_task_dl().
>>
>> So more testing revealed that the patch also starve both task
>> eventually. Both process make no progress at all.
>>
> 
> Mmm, that's bad.
> 
> Can you give a try to this different patch (after applying
> the other one I sent out)?
> 
> This thing is looking good on my box. I'd like to do more
> testing, but I have to context switch for a bit now :/.

I'll applied both patches and my test program runs fine since a couple
hours. Before that a panic triggered within minutes.

cheers,
daniel
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