Re: [PATCH v2 10/10] sched/eevdf: Move to a single runqueue

[Peter Zijlstra]

On Thu, May 21, 2026 at 12:31:17PM +0200, Peter Zijlstra wrote:
> On Wed, May 20, 2026 at 06:32:11PM +0200, Vincent Guittot wrote:
> 
> > I finally fount the root cause of regression: the update of entity lag happened
> > after the task has been dequeued which screwed update_entity_lag():
> > 
> > update_entity_lag must be called after updating curr and cfs_rd and before 
> > clearing on_rq
> > 
> > With the fix below I'm back to original hackbench figures and maybe even a bit better.
> > I haven't checked shceduling latency yet

I see a very slight hackbench regression on the high end, but meh. The
latency-slice test seems to have slightly improved max values, but this
isn't the most stable of things.