Re: [PATCH 1/2] sched/wait: Break up long wake list walk

[Linus Torvalds]

On Tue, Aug 22, 2017 at 1:53 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> So _the_ problem with yield() is when you hit this with a RT task it
> will busy spin and possibly not allow the task that actually has the
> lock to make progress at all.

I thought we had explicitly defined yield() to not do that.

But I guess we could make this yielding behavior depend on a few more
heuristics. So do the yield only when there is contention, and when
it's a non-RT task.

          Linus