Re: [PATCH -tip 09/32] sched/fair: Snapshot the min_vruntime of CPUs on force idle

[Vineeth Pillai]

Hi Balbir,

On 11/22/20 6:44 AM, Balbir Singh wrote:
> This seems cumbersome, is there no way to track the min_vruntime via
> rq->core->min_vruntime?
Do you mean to have a core wide min_vruntime? We had a
similar approach from v3 to v7 and it had major issues which
broke the assumptions of cfs. There were some lengthy
discussions and Peter explained in-depth about the issues:

https://lwn.net/ml/linux-kernel/20200506143506.GH5298@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/
https://lwn.net/ml/linux-kernel/20200515103844.GG2978@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/

Thanks,
Vineeth