Re: [Question] Sched: Severe scheduling latency (>10s) observed on kernel 6.12 with specific workload

[Dietmar Eggemann]

On 14.04.26 06:18, Xuewen Yan wrote:
> Thanks Dietmar!
> 
> On Fri, Apr 10, 2026 at 7:14 PM Dietmar Eggemann
> <dietmar.eggemann@xxxxxxx> wrote:
>>
>> On 08.04.26 03:50, Xuewen Yan wrote:
>>> Hi Dietmar and Vincent,

[...]

> We tested in Android tree without any vendorhooks.
> Just as John said, after we revert commit 6d71a9c61604 ("sched/fair:
> Fix EEVDF entity
> placement bug causing scheduling lag") in android16-6.12, the latency
> disappeared, because the commit is not exist in stable tree.
> 
> On the other hand, we also tested the android17-6.18, without any
> revert, the latency still exist.

So it's not about the wu_lat of the rt-app tasks but the latency values
of the cyclictest tasks?

cyclictest -m -t -a --policy=SCHED_OTHER -b 1000000 -D
120s

[...]