Re: [PATCH 07/16] sched_ext: Add a DL server for sched_ext tasks

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Hello,

On Wed, Sep 03, 2025 at 10:08:22PM +0200, Peter Zijlstra wrote:
> > I'm a bit confused. This series doesn't have prep patches to add @rf to
> > dl_server_pick_f. Is this the right patch?
> 
> Patch 14 seems to be the proposed alternative, and I'm not liking that
> at all.
> 
> That rf passing was very much also needed for that other issue; I'm not
> sure why that's gone away.

Using balance() was my suggestion to stay within the current framework. If
we want to add @rf to pick_task(), that's more fundamental change. We
dropped the discussion in the other thread but I found it odd to add @rf to
pick_task() while disallowing the use of @rf in non-dl-server pick path and
if we want to allow that, we gotta solve the race between pick_task()
dropping rq lock and the ttwu inserting high pri task.

Thanks.

-- 
tejun




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